第3部分施工机械配备Section III Deployment of Construction Equipment 3.1施工机械的选择及布置 Option and Arrangement of Construction Equipment 从全局出发，考虑施工机械在整个工程中的综合利用，在现有的或可能获得的机械中选择。选用的机械必须满足第3部分施工机械配备Section III Deployment of Construction Equipment
3.1施工机械的选择及布置 Option and Arrangement of Construction Equipment
We take into consideration the integrated utilization of construction equipment during the whole project, choose the equipment from our existing and possible available equipment. The equipment must satisfy construction need. We consider mutual support of different equipment and ensure to bring the leading construction equipment into full play.
According to our machine resource status and the construction features, 1 tower crane and 1 derrick are arranged for vertical Conveyance of mixed structure of building frame to the third floor of 1# production building, 1 tower crane and 1 derrick are arranged for vertical Conveyance of mixed structure of building frame to the second floor of 1# production building, 1 derrick is arranged for vertical Conveyance of mixed structure of building frame to the second floor of 2# production building. Above measures ensure the smooth progress of construction.
Construction site layout, in combination with the actual condition, we provide 2 sets of reinforcing steel equipment and 2 sets of woodworking equipment. For details of other construction equipment selected, please see schedule list of main construction equipment. Equipment moving into and removing from the site must follow Owner’s requirements. For mechanical facility layout pleas refer to general construction layout plan
第4部分 施工平面布置Section IV Construction Layout Plan
4.1 施工总平面布置 General Construction Layout Plan
Two gates are built on site according to site situation and bidding requirements, construction road has 4m width and its surface should be flattened and compacted, ballast should be 250cm thick, C20 concrete with 15cm thickness should be coasted and open ditch drainage should be built along both sides of the road.
A washing room may be built up at the entrance according to site situation and special personal should be appointed to manage vehicle access at the gates. Vehicles leaving the site are allowed to run into the city only after cleaning tires to maintain both appearance of the company and city.
Retaining ditch should be built at the entrance, settling tank and high-pressure hydraulic pump for washing vehicles before leaving site are also built. Waste water from construction must be processed with settlement before discharge.
Site construction road will be arranged along the gate on the construction site within the plant. Also the project bulletin board and publicity column will be set up at the entrance.
Beside the guardhouse at the entrance will be provided with fire control apparatuses. At other temporary facilities, especially at the fire control area fire control apparatuses should be provided as specified and draw up fire control apparatus distribution and responsibility chart.
Guardhouse will be set up on site. Inside the guardhouse will be set up valid management system and have safety helmets prepared. Moving into and removing from the site must be registered. Security service must be on duty within 24 hours every day.
Construction roads set up road entrances and exits marked for warning notices, as well as the marked point of the night, and set up dedicated personnel for the management of import and export vehicles
Main temporary facilities include the site temporary office for our division, supervision company and all subcontractors, reinforcing steel processing shop, carpenter’s shop, and our material sample room, warehouse, conference room, material storage, material laydown area, test cube basin, etc. These temporary facilities lay out in the general construction layout plan.
4.1.1 材料堆场及加工场布置 Arrangement of Material Laydown Area and Working Shed
Material laydown area and fabrication shop will be arranged according to building distribution and construction road, production facility in proper manner.
Construction site will be prepared with sufficient waterproof materials for coverage against severe weather and protection of all works and materials.
Our division ensure moving construction equipment and scaffolding into site and removing from the site and placing position subject to the Owner’s approval.
Without prior consent of the Owner, our personnel and equipment and material should not be allowed to move into the buildings that have been put into use during construction.
Our division will erect material storage and fabrication shop at the places designated and approved by the Owner and maintain them in good condition.
Our division ensures that placing and management of construction materials must observe the rules and regulations and requirements for site safety management set out by relevant governmental authorities and Owner.
In order to meet the main body structure construction, at the second construction block will be set up two reinforcing steel fabrication shops.
4.2 施工用水、用电方案 Construction Water and Electricity Plan
4.2.1 临时用电布置 Temporary Electrical Consumption
For construction electricity, the Owner will provide temporary power system. Our company will be responsible for connecting to all construction equipment.
Design cable size used at construction block will be 120mm2，every 40 meters will be provided with a 2-class distribution box. Cable line will be buried underground and signboards will be set up on the corresponding places. Electricity used for office and construction will be connected from the distribution box.
Construction temporary electricity vertical layout, selection of cable size 25mm2, each floor will be set up a 3-class electrical box, which must be 60A 3-phase 5-wire construction distribution box in addition to complying with Shanghai Safety Specification and Ordinance for Construction. Inside the box will be equipped with 6 sockets of single-phase 220V 15A controlled by leakage protection switch, 3 sockets of 3-phase 380V 20A and one socket of 30A controlled by leakage protection switch, and 4 single-pole switches of 10A to be used for temporary lighting.
On each floor will be installed energy-saving lamp for construction use. Energy-saving lamps should be evenly distributed in the elevator hall, stairs, holes, as well as reserved places, such as evacuation routes.
Power used for tower crane, derrick and other large equipment will be separately pulled out cable from a dedicated electrical box, cable sizes will be 120mm2 and 120mm2, 75mm2. The manufacture of all electrical boxes and circuit layout will be performed in accordance with Shanghai Safety Specification and Ordinance for Construction
用电平面布置参见附图。For electricity layout refer to attached diagram
4.2.2 临时用水布置 Temporary Water Consumption
The Owner will provide temporary construction water Φ50 used for construction for this project.
Pipes and cables will be arranged around the site, every 50m will be set up a tap, every 40m set up a power box. The Owner will provide temporary water pipe size 50, and we will be responsible for connecting to the site.
施工用水在平面上和立面上分开布置，在平面上沿施工场地周边布置，水管用2管，在施工场地周边的水管每隔40m左右，设一个3/4¢水龙头。Construction water will be separately distributed on plane and elevation. Construction water on plane will be arranged around the construction site, use 2” water pipe. Every 40m of water pipe around the construction site will be provided with a 3/4’ water tap.
竖向供水要求每层设1只3/4¢施工水龙头，每二层设置一临时消防栓，每消防栓旁设一封闭式手动开关，于火警时能启动临时消防泵。Construction water on elevation will be required to provide a 3/4’ construction water tap every floor, every two floors will be provided with temporary fire hydrant, beside every fire hydrant will be provided with a closed-type manual switch to activate firefighting pump in case of fire alarm.
The General Contractor Party will establish a management group to control construction water and firefighting water, dedicated personnel will be responsible for daily supervision and maintenance to ensure the firefighting rescue system not being abused and the operation maintained in normal condition within 24 hours.
施工平面布置详见附图。For construction layout plan see attached diagram
4.3 施工现场平面布置图（见附图）Construction Site Layout Plan (See attached diagram)
4.5 Temporary Water and Electrical Distribution on Jobsite, see attached diagram
第5部分 施工方案Section V Construction Plan
5.1 施工流程 Construction Flow
5.1.1 钢筋混凝土工程施工流程 Construction Process of Reinforced Concrete Engineering
管桩拼缝允许偏差表Allowable Deviation of Pipe Pile Splicing Seam
几种特殊情况的处理 Handling for certain special situations
2、 Situation handling according to pressure of designed pile length below the standard
In practical construction, it is often found that the dept reaches the designed requirement, but the pressure does not reach designed elevation, under such situation, the pile follower should keep pressing downward, if the situation remains, then it should be reported to supervision engineer and design unit, subsequently, relevant remedial measures suggested by supervision engineer and design unit should be performed, e.g. pile patching.
2、不能压至 设计标高的处理 Handling for failing to press to the designed elevation
In practical construction, it is sometimes found that few piles cannot be pressed to the designed elevation due to geology or other reasons, under such situation, equipment reasons should be firstly confirmed, after confirming equipment in good condition, then it should be reported to supervision engineer and design department, relevant remedial measures suggested by supervision engineer and design department should be performed.
3、断桩处理 Handling broken pile
It is unavoidable to find dislocation, poor verticality and squished pile head during pile driving construction, if so, damaged piles must be removed and new piles should be filled. Pile breaking will easily occur, when geology is poor, such as silt layer is too thick or soft and hard stratums rapidly change, if so, the adding stake method must be adopted. It is forbidden to use the method of bottom sealing with concrete which can cause complex results. However, when pile heads are lightly damaged, the bottom sealing method with concrete can be used for waterproof handling to cover the damage of pile heads.
4、管桩与基础底板连接 Connection between tubular pile and foundation mat
For effectively preventing foundation floating up and ensuring entire coordination between foundation and pile foundation, garbage and feculence in pile holes must be cleaned after earthwork excavation reaches the designed elevation and tubular pile expose. Before binding foundation steel bars, the design drawing must be strictly followed to ensure the connection of tubular pile and foundation. Anchor bars of tubular piles should be firmly welded with steel bars of foundation mat by binding foundation steel bars, meanwhile, steel bars of foundation should be also firmly welded with tubular pile head.
For few tubular piles above the designed elevation, the above parts should be cut by direct cut of cutting machine. It is forbidden to damage tubular pile parts below the designed elevation of pile top in any form.
5、压桩过程质量控制 Quality control of pressing pile
Accurate calculation on staking out data and correct operation of staking out of construction are preconditions for ensuring stake standard, it is never allowed to raise wrong placement of stake due to inaccurate measurement and staking out, so the whole process of staking out must be repeatly inspected to avoid any mistakes.
The construction must be performed in strict accordance with approved construction scheme, pile extension welding must be carefully done by welder with experience and professional qualification based on requirements of technical regulation, to ensure welding lines homogeneous and full. Technical down time, deviation between up and down nodal plane and node bending bilge should achieve requirements of regulations.
The final pile-forming is controlled by length and pressure which should meet design requirements.
Sequence of pile driving should be reasonable, following the principles such as “from inside to outside”, “from centre to side”, “from deep to shallow” and “from thick to thin”, as well as “from close to far” (piles close to building should be derived firstly, then the far distance), to minimize compaction effect.
Pitching pile and extension pile should ensure centre correct and pile shaft vertical. Placing pile tip should follow steps as emplacement, centering and straightening. For YZY pile driver, pile tip should be centered through starting longitudinal and transverse translation cylinder. Pile driving cylinder starts to press pile about 1m into soil then stops, followed by adjusting the verticality of pile in two directions. Whether the first part of pile is vertical or not is the key to ensure the quality of pile shaft.
Driving pile. Pile is clamped by clamping cylinder, then pressure is brought to pile by extension stroke of driving pile, press-in force is indicated on gauge. Relationship of pile depth and gauge readings should be carefully recorded during driving pile to judge quality and bearing capacity of pile. When readings of gauge suddenly rise or drop, the machine should stop and analysis should be carried out according to geological data to find out if there is an obstacle or broken pile.
When broken pile occurs, the broken pile must be removed and filled again without any delay.
Any abnormal conditions during driving pile should be reported to supervision engineer and design unit to make correct counter-measures timely, self-settlement is strictly forbidden.
Various tests and inspections should be performed in strict accordance with specifications and design requirements after completion, unqualified pile foundation must be removed and filled again.
All data records during driving pile should be detailed, complete, standard and normative.
5.4.3 土方开挖工程 Earth Excavation Work
Observe Construction drawings technical requirement, Shanghai specification and standard, Code for Construction and Acceptance of Cement Concrete Road Surface GBJ97-87, Code for Design of Building Subgrade GB50007-2002, Technical Specification of Building Sloping Work GB50330-2002, Technical Specification for Treatment of Building Subgrade JGJ97-2002, Code for Construction and Quality Acceptance of Building Subgrade Foundation, Standard of Geotechnical Testing Method GB|T50123-1999.
关于基坑开挖施工时将提交给业主的文件 Submittals deliverable to the Owner
all delivered materials quality certificates, test result, source and sample.
夯实机械出场说明书和性能。Compaction equipment instruction manual and performance
Compaction method, testing method, test result and proposal.
Construction process control: during construction dynamic control is more important. Dynamic control includes more communication, frequent survey and improving adjustment.
Frequent survey and improving adjustment: during construction, frequently survey, grasp work quality, analyze issues, make necessary adjustment, trace the situation after adjustment, steadily improve work quality.
22.214.171.124 挖土施工 Excavation Work
According to construction technical drawings and technical specifications: the preparation before excavation includes cleaning construction area and passageways within 3m of the site, as well as removing tress, bush, stumps and garbage on site, digging out roots (diameter greater than 25mm) and other vegetation. It is forbidden to destroy trees required to be left, waste disposal should be according to national and local regulations. After cleaning the site, topsoil could be only removed with approval of management company. Topsoil and subsoil should never be mixed.
Excavation will be done by two backhoe excavators 1m3 capacity and one backhoe excavator 0.5m capacity and 15 vehicles are used for moving soil.
Field water connection, electricity connection, road connection and grading are finished. During excavation, place steel plate under excavator to prevent it from collapse.
Foundation excavating procedure” survey and setting out – cutting line – excavation in layers – discharge and lower water – leveling – reserve sufficient soil layer.
According to the design requirement, when earth excavation is deeper to the capping of 300mm high above foundation slab, use manual digging till obtain design elevation. Then inspect bottom width and elevation, unevenness of bottom of foundation pit is required not to exceed 1.5cm. but pay attention not to over excavate and disturb the existing soil quality. Therefore, surveyor is required to attend the measuring height at all times and correctly guide excavator digging and manual digging.
For survey and setting out, i.e. before earth excavation, all survey control points extend to the place where vehicles could not damage them according to setting out requirement, it is better to set control point at the outside of the foundation edge and keep record.
Post-concreting area earth excavation of the foundation base, when excavate to the lower elevation of foundation slab, adopt manual excavation. Excavation depth will be 100mm deeper than foundation slab; in addition, at two ends of the post-concreting area, excavating depth is 400mm, and set masonry sump well, plaster with 1:2 cement mortar inside the well.
Manually excavate to the design elevation, the surveyor is required to trace all process, and use a 250mm long prod for every 1.5-2m. the top elevation of the prod is used to control surface elevation of the bedding course.
After completion of excavation inside the foundation pit, draft grid plan drawing according to design requirement and construction requirement. Monitor foundation soil at intervals of 2-4 hours. If water suring occurs, immediately notify company technical department or contact the Owner and design institute.
After completion of foundation pit excavation, immediately report supervision, Owner and design institute, if necessary, to witness the trench acceptance and prepare and record foundation acceptance information and data.
Monitoring of Peripheral Environment when Foundation Pit Excavation
Drainage Measures inside and outside the foundation pit
During foundation pit construction, all water draining will be done according to the Specification for Operation of Surface Water Drainage”.
Foundation pit excavation starts with sump of 800800800 deep, in the middle set a sump at intervals of 30m, at the corner add sump. Between all sumps connected with 300200 drainage ditch, make drainage in the foundation pit unblocked.
set a through drainage ditch with 400x400 brick masonry, set 800×800×800（H）sump along drainage ditch at intervals of 20-30m. collect the surface rainwater, wastewater, set precipitation tank, drain into the municipal underground piping system or flood channel.
126.96.36.199 基坑四周的安全围护 Safety Protection around foundation pit
Start from the foundation excavation, safety protection support set around the protection structure, the protection support height is 1.20m, set a fixed post at intervals of 4m, other poles set between them at intervals of 2m, cross bar set three rows, poles embed under the earth 50-70mm. steel tube surface coated with yellow-black paint. Protection support will be enclosed with safety net.
To facilitate the operator up and down and material conveyance inside the foundation pit, from the very beginning of excavation, set an accessible ladder according to site physical condition. Ladder with will not be smaller than 1.5m.
188.8.131.52 土方回填注意事项 Points for Attention of Earth Backfilling
Backfilling should be in accordance with techniques provided by design unit and national regulations.
回填材料 Backfilling materials
Stone backfilling: the stones must be graded dry stones, bricks, concrete and other hard material. Max. gravel size will not be larger than 50mm. backfilling will not exceed 150mm in every layer. The surface will be compacted.
Backfilling material should not contain branches, weeds, organic matter and other toxic substances. If for gravel backfilling, gravel should be clean, hard, durable, good gradation, appropriate fine aggregate content , maximum gravel size should not over 150 mm
When the backfilling material is clay, the best soil moisture content and the corresponding maximum dry weight will rely upon testing of ramming pressure.
Compaction and backfilling must obtain the Owner’s approval. Equipment will be used within a distance of 1.5m from the wall or concrete structure. Compaction of the backfilling soil close to concrete wall will be done with manual operating equipment.
Backfilling for the concealed river area and structure subsurface: backfill soil to the designed depth, each layer backfilling will not exceed 250mm, compaction ratio will not be less than 88%, backfilling on the top is required to leave room.
Each layer backfilling is close to horizontal, the thickness in every layer relies upon the soil condition, but will not be over 200mm.
At the period of compaction, control water content rate in soil. The best water content will be plus or minus 2%
Conduct site testing on compaction equipment, ensure obtaining compaction requirement.
For compacted soil density percentage, acceptance standard will rely upon the max. dry density specification in GBJ225-97.
Compacted soil must pass density experimental test.
184.108.40.206 混凝土垫层施工 Concrete Cushion Construction
After excavation of foundation pit, bottom earth top elevation and drainage facility finish construction. Place cushion concrete as soon as possible, bottom earth should be over exposed, control within 24 hours is best.
Cushion C15 concrete, 150mm thick. On the day completing the foundation bottom excavation, organize crews to place and tamp concrete.
Concrete will be ready-mixed concrete. Before purring concrete, get in touch with the concrete manufacturer. Requirement on ready-mixed concrete manufacturer: concrete production qualification, concrete test report, final concrete mixing ratio and concrete productivity, transportation capacity.
Accurately set out side line of foundation pit C15 concrete cushion. The cushion will be over the foundation slab side for 100mm wide. Adopt 50mm thick and 100m wide timber as formwork. The formwork will be fixed with short rebar.
Post-concreting cushion method according to general structuring construction description.
use vibrating needle or platen vibrator to vibrate concrete, then use 2m screeder for leveling, finally manually roughen concrete surface with wood trowel. Surveyor will measure the surface elevation on the cushion.
Cushion width of the two ends of post-concreting area should fully consider waterproofing requirement, formwork installation, protection during concrete pouring, operation space, etc.
Make good receiving work of concrete, test pieces, test cubes and all engineering information and documents for foundation slab construction.
5.4.4 桩头连接施工 Pile Head Splicing Construction
Foundation pile, after acceptance, its head will be treated, connect the pile to the capping according to national and local drawing atlas requirement. (See the following diagram)
5.4.5 钢筋工程 Reinforcement Work
Work requirements should be built by implementing requirements of construction drawings and relevant national regulations, as well as local requirements. GB1499、GB13013、GB50204-2002.
结合建设单位的要求、混凝土结构工程GB 50204-92。合同要求、及工程图纸及说明。 Combining requirements of construction unit, Concrete Structure Engineering GB 50204-92. contract requirements, construction drawings and instructions.
220.127.116.11 钢材的进场、检验与标识 Steel delivery, test and identification
Our company will choose several suppliers from the qualified supplier’s list for synthetic assessment. When importing materials choose the final supplier as our supplier for steel material.
Acceptance on receipt: material controller, dedicated quality inspector inspect steel when moving into site. Steel per bundle (pan) should have index tag (indicating manufacturer’s name, production date, steel number, heat number, steel class, diameter) and attached with quality certification.
Inspection per batch is composed of the same brand, same heat number, same size, same delivery steel, weight is not greater than 60t. conduct visual observation at a rate of 5%. Steel surface should not have cracks, scars and wrinkles, but allow projection, the projection will not exceed cross rib height. Other allowable defect depth and height should not be greater than the allowable deviation of the location size.
Choose any two reinforcing steels from the back reinforcing steels for tensile strength test (including yield point, tensile strength and elongation) and cold bending test. If one item test result is not be in accordance with the requirement, choose the test sample in double quantity from the same batch for all items of testing. If one test sample still could not be qualified, that batch of reinforcing steel is considered as non-compliance product and shall remove back to manufacturer.
Hot rolled reinforcing steel will pass chemical composition analysis or other special testing if finding fracture, bad welding performance or mechanical property during processing.
According to ISO9000 2000 standard, execute our company “Program for Production Identification and Traceability Work” , establish laydown area for qualified steels, place the steels by different sizes, tag out, indicating steel class, size, place of origin, quantity, etc. Reinforcing steel should be subject to qualified test then enter into the laydown area for qualified steel. The laydown area will be individually set up as its unit work.
提供业主的资料：Submittals to the Owner
Mill test reports certifying physical and chemical properties or ex-factory certificate of qualification for reinforcing steel to be delivered to the site.
钢筋施工详图。Reinforcing steel construction detail
各种焊接焊工的资格证书。A copy of all welder’s certificates prior to any welding.
有关钢筋铺设检验的钢筋报告。Reinforcing steel placing test report
18.104.22.168 钢筋翻样 Reinforcing steel Lofting
Our division will assign a professional foreman for reinforcing steel lofting according to drawing, engineering technical principal will review the lofting sheet, then the further rebar fabrication and working can be done.
Lofting will be done according to the actual work condition, drawing structure description and standard drawing atlas 3G101-1、03G101-2、04G101-4.
Major technical measures: main reinforcement of reinforcement foundation uses lap joints, foundation beam comprises C18-C25 reinforcement welded by flash welding, column vertical reinforcement is jointed by electroslag pressure welding.
welding joint will not be set at max. compression area, and the number of the same cross-section joint will not be over 50%, overlap joint will not be allowed to set at max. tensile area and within the same cross section the overlap joint will not be over 1/4 (overlap length 44d) or 50% (compression area, overlap length 48d).
Length calculation of reinforcing steel undercut: according to the size indicated on the drawing, consider reinforcing steel anchoring length, overlap length (see following table); flash butt-welding increases flash capacity, electroslag press welding increases reinforcing steel melting capacity 25mm; reinforcing steel anchoring, overlap length table
Calculation of stirrup size considers number, diameter of beam bar, divide spacing of reinforcing steel equally and meet reinforcing steel covering requirement.
22.214.171.124 闪光对焊 Flash Butt-welding
The foundation work will use preheating flash butt-welding method, adopt three sets of flash butt-welding machines.
对焊操作必须持有证件，在上岗操作之前对其进行考核，方才正式上岗。 Butt-welding operation must have permit. Before welding the welder shall pass welder’s examination.
Before welding remove rust, sludge, on the reinforcing steel end, if reinforcing steel have elbow should be cut off. After welding, should not immediately release the fixture, wait until the joint becoming red and black release the fixture, smoothly remove out reinforcing steel so as not to produce bending. Welding reinforcing steel shall be placed overhead, and ensure that the welding site has weather-proof protected, so as not to happen suddenly cooling joints, brittle fracture happened.
Test: in the same shift, 300 welding joints done by the same welder for same class, same diameter will be considered as one batch. In the same shift, the joints can be accumulated and calculated within one week. If a total of 300 joints is still insufficient, also considered as one batch; for mechanical properties test, 6 specimens shall be randomly obtained from the finished products; if test results do not meet request, may take double the number of specimens to retest
126.96.36.199 电渣压力焊 Electroslag press welding
Select welding parameters according to the diameter of reinforcing steel
焊接参数的选择： Preference of welding parameters
Visual inspection: inspect joint appearance for full of welding, burned marks, displacement. Displacement shall not exceed 0.1d of reinforcing steel diameter, and not greater than 2mm.Joint bending point shall not greater than 4，if finding such issue cut off the joint and reweld.
Tensile test: at one level, joints of the same size not less than or equal to 300 consider as one batch. Obtain three joints on site for tensile test. Reinforcing steel can be put into use in the work after qualified test. If unqualified, obtain double the number of specimens for retest. If retest can not obtain the requirement, that batch will be deemed as non-compliance and they will be cut off and reweld.
188.8.131.52 钢筋的辅助配件 Auxiliary reinforcing steel parts
绑扎用铁丝：16号以上退火软黑铁丝 tie wire: 16 gauge or heavier black soft annealed wire.
Bar supports: proper type for the intended use in conformance with related requirements.
Bright basic supports where the supports do not come in contact with exposed concrete surfaces.
Plastic-protected supports where the support come in contact with exposed concrete surfaces.
Bright basic bar supports with sand plates or precast concrete bar supports in concrete placed on grade or against earth cuts.
Upset threaded mechanical couplers: designed to develop 110% of the yield strength of the reinforcing steel.
fusion mechanical couplers: designed to develop 100% of the yield strength of the reinforcing steel.
End-bearing splice devices: designed to develop 100% of the compressive strength of the reinforcing steel.
184.108.40.206 钢筋绑扎 Reinforcing steel Binding
before binding reinforcing steel, remove the contaminants on the reinforcement, especially the rust mark and the welded points.
Main bar placing procedure from bottom to top: primary beam bottom 1 secondary beam bottom 1primary beam bottom 2secondary beam bottom 2primary beam surface 2secondary beam surface 2primary beam surface 1secondary beam surface 1. main bar spacing placed evenly and clear distance not less than 50mm. use C25 as shim between two reinforcement layers at intervals of 1.5m. mark out stirrup position on main bar, stirrup opening staggered arrangement, use 20# tie wire to secure reinforcing steel bar.
Column main bar joint, when reinforcing steel is 16≤25 in diameter, select vertical reinforcing steel electroslag press welding, if the bar is larger than 16 in diameter use lap connection. Main bar joint shall be 50% staggered.
Column stress bar mechanical connection joint shall be mutually staggered, connecting length shall be 35d, area percentage of stress rebar joint within the same connection section shall not be larger than 50%.
Beam stress rebar joint use butt-welding, slab rebar joint use lap connection by tie wire.
Anchoring length of rebar is lae=35d；lap joint length of stress rebar is ll=44d（joint area percentage 25%）; ll=48d (joint area percentage 50%). Non-stress rebar lap joint length (distribution bar) ll=35d，and not less than 200.
Allowable stress rebar joint area percentage of the same cross section: within tensile area, rebar lap joint in the skeleton and mat 25%, other type of lap joint 50%.
Alternate corner bars at wall intersections and tie and stirrup cap hooks 180°.
Spiral lap splices shall be 48 bar diameters minimum or 300mm, whichever is greater.
Reinforcing steel shall be supported by use of bar supports at one meter in any direction.
Concrete conveying equipment, etc. shall not be supported on reinforcing steel or supporting accessories.
剪力墙及暗柱绑扎：Shear wall and concealed column binding
Before walls, pillars binding, should be based on the positioning line once again calibrate dowel bar, severe displacement required earnestly treated and, if necessary, request design institute, supervision for agreement, embedding dowels in the wall and column shall ensure the correct position. Requirement: wall horizontal bar shall not be less than 3 courses, column hoops not less than 3 courses, and the first course must be fixed and spot welded on the slab surface bar. Vertical wall rebar see Figure