(完整版)桥梁施工计划英文版BridgeFoundationandsubStructureConstructionProgr

1、Bridge Foundation and Substructure ConstructionProgramme (k5+000 3X 25m=75m Mamboleo Bridge)1. Basis(1) The Standard Specification for Kenya Road and Bridge Construction.(2) Contract of the Rehabilitation of Kisumu-Kakamega Road, Special Specification.(3) Drawings.(4) The General Requirement of Cons

2、truction Period.(5) Actual condition in-site.2. General Status of the Bridgewe plan to commence construction of Km5+000 bridge recently. The superstructure is 32.5m cast-in-situ continuous “T”girder(30/20 concrete). The bridge pier and abutment of substructure is extended open cut foundation(30/20 c

3、oncrete). Pier body adopts thin-walled pier (30/20 concrete) and bridge cap beam (30/20 concrete). The type of abutment body uses wing-wall abutment(30/20 concrete) and 30/20 reinforced concrete structure. Attached please find Km5+000 Manboleo bridge substructure programme.3. Found ation (Extended O

4、pen Cut Foundation) Construction Technology Scheme(1) PreparationThe preparation of construction mechanical equipment, staffs, location set-out, original material test and standard ratio test have been completed, and the side road around construction location could meet bridge construction requireme

5、nt.(2) Foundation Pit ExcavationMechanical equipment shall apply to foundation pit excavation,and labor forces clear the bottom of pit. Based on the actual condition of excavated culvert, foundation pit slope sets out is 1:0.33 or1:0.25. 10cm-20cm width shall be reserved for labor force cleaning. If

6、 the underground water in high level, a ring drain will be excavated around foundation pit. The top width of drain is 0.5m, and underpart is 0.3m; One3water collection pit(0.5 0.5 0.8m ) shall be excavated if necessary.(3) Set Out and Blinding ConcreteAfter finishing foundation pit cleaning, the sur

7、face of pit shall be compacted. Then, commencing set out base location, dimensions and elevation,the results of which shall be reported to Engineer for inspection and approval. After that,casting100mm blinding concrete(15/40) in-situ. The top elevation of blinding concrete is the same with the botto

8、m elevation of pile cap, which is under the requirement of specification. The width of blinding concrete is 0.05m larger than pier cap outline,which need strictly control during construction.(4) Reinforcing Bar EngineeringThe bearing platform foundation reinforcement is centralized blanking and proc

9、essing. Concrete cushion block is applied between steel reinforcement and formwork to insure protective layer thickness under the design requirement.A, Steel Reinforcement Processinga, The test result of reinforcement steel shall be approved by the Engineer. All the steel bars shall have quality cer

10、tificate.b, The steel surface shall be cleaned for oil spot , paint and rust pitting; the steel shall be straight without local bending. When cold drawing method adopted, Grade I steel cold draw n rate 三 2% ,and Gradell steel = 1%.c, Based on reasonable,economic and practical principle, steel blanki

11、ng shall obey the requirement of drawings, and avoid processing large quantities of short steels. Reinforcement steel is processed in strip slab which is cast-in-place concrete(15/20concrete) slab with width 1.2m and length 20m. Steel will be marked by steel ruler or flexible ruler on strip slab, an

12、d processedby machine with settled bending angle.d, Connection of Steel Bar:to meet the requirement of lap length , lapped bar will be applied to main reinforcement.B, Others matters shall strictly adhere to the requirement of construction specification.(5) FormworkA, the formwork for bridge bearing

13、 platform(foundation) is bulk assemblesplit formwork. To ensure the joints smooth without joint trace, the steel plate for formwork is 5mm (or fabricated formwork whose back arris is made by 1.22*2.44m wood glue board and lumps of wood).B, the stiffness,strength and stability of fromwork shall meet

14、requirement. No formwork shall be applied to con structi on without in specti on and approval.C, fromwork shall be shuttered by skilled labor at one time. In order to avoid leakage and in sure con crete quality, the joi nt seam shall less tha n1.5mm, fault ing of slab less tha n 1.5mm. Releas ing ag

15、e nt shall be applied to rein forceme nt before in stallati on.FORMWORKD, Formwork installation shall be tight. The joint shall be sealed in good condition to avoid spillage and ensure structure surface looks good, lines and shape smooth.E, the planimetric position, top elevation, joint and Iongitud

16、inal stability shall be checked after formwork in stallati on. Mea nwhile, the len gth and pla nimetric positi onof embedded bar shall be checked. The con crete shall not be cast without the approval of Engineer. Formwork shall be inspected during casting in case out of shape.F, Formwork Dismantleme

17、nt: concrete work shall not be damaged during dismantlement. Dismantlement shall follow the procedure of “support first dismantle afterward”, “dismantle first support afterward”, and formwork shall not be threw during removal. The dismantlement minimum period is according to the requirement of gener

18、al specification clause 17-4.(6) Construction of Concrete WorkConcrete shall be mixed in mixing plant, measured by E-metrics and transport by truck, truck crane or concrete pump, and vibrated mechanically to avoid honeycombs and holes. Once forming continuous concrete casting shall be applied to con

19、crete work without construction joint and seam. Test sample no less than 2groups.(7) Foundation Pit BackfillConcrete curing shall be at least 7 days after foundation concrete complete, then back-filling in layers when concrete strength meet requirement. Back-filling and compaction shall adhere to th

20、e standard specification.4, Thin-walled Pier, Bridge Beam and Wing-Walled Abutment Construction Technology Scheme(1)Reinforcing Bar EngineeringThe reinforcement of pier and abutment is centralized blanking and processing, and concrete cushion block will applied between reinforcement and formwork to

21、insure the thickness of the protective layer and design requirement.A, Reinforcement Processinga, The test result of reinforcement steel shall be approved by the Engineer. All the steel bars shall have quality certificate.b, The steel surface shall be cleaned for oil spot , paint and rust pitting; t

22、he steel shall be straight without local bending. When cold drawing method adopted, Grade I steel cold draw n rate 2% ,and Gradell steel = 1% .c, Based on reasonable,economic and practical principle, steel blanking shall obey the requirement of drawings, and avoid processing large quantities of shor

23、t steels. Reinforcement steel shall be processed in strip slab which is cast-in-place concrete(15/20concrete) slab with width 1.2m and length 20m. Steel shall be marked by steel ruler or flexible ruler on strip slab and processedby machine with settled bending angle.d, Connection of Steel BarTo meet

24、 the requirement of lap length, lapped bar will be applied to main reinforcement.B, Other matters need attention shall under the requirement of construction specification.(2) FormworkA,the formwork for pier is bulk assemble sheet steel form, and form for abutment is fabricated formwork whose back ar

25、ris is made by wood glue board and lumps of wood. To ensure the joints smooth without joint trace, split billot turnover form method shall applied to construction, and casting length is 3-4m every time. Special-shaped form shall be prepared according to different pier and bridge mast, and the steel

26、plate for formwork is 5mm. Formwork shall be reinforced by steel framework.B, the stiffness,strength and stability of fromwork shall meet requirement. No formwork shall be applied to construction without inspection and approval.C, fromwork shall be shuttered by skilled labor at one time. In order to

27、 avoid leakage and insure concrete quality ,the joint seam no more than 1mm, faulting of slab shall follow the regulation of specification. Releasing agent should be applied to reinforcement before installation.D, To avoid form skew,outside of formwork shall be reinforced. The method of reinforcing

28、form as follows: a, steel scaffold; b, mooring rope; c, split bolt and drawbar. Total station instruments or drop ball shall be used to check up foresaid form. Total station instrument shall applied to examine high pier concrete construction.Pier formwork reinforced as follows:E, the installation of

29、 the formwork shall be tight. The joint shall be sealed in good condition to avoid leakage and ensure surface looks good, line and shape smooth.F, the planimetric position, top elevation, joint and Iongitudinal stability shall be exam ined after formwork in stallati on. Mea nwhile, the len gth and p

30、la ni metric positi on of embedded bar shall be checked. The con crete shall not be cast without the approval of Engineer. Formwork shall be inspected during casting in case out of shape.G Formwork Dismantlement: concrete work shall not be damaged during dismantlement. Dismantlement shall follow the

31、 procedure of support first dismantle afterward” dismantle first support afterward” and formwork shall not be threw during removal. The dismantlement minimum time is according to the requirement of general specification clause 17-4.(4) Con structio n of Con crete WorkConcrete shall be centralized mi

32、xed and hardened in mixing plant, and stored accord ing to differe nt materials, and separated by brick wall. Mixed con crete shall be measured by E-metrics and tran sport by truck, truck crane or con crete pump, and vibrated mecha ni cally to avoid hon eycombs and holes. Pier body shall cast 2-4m e

33、very time, and con struct ion joint and seam shall be rema in ed. Test sample no less than 2groups.Staffs and equipme nt arra ngeme nt for each pier, abutme nt as follows:StaffsNoItemQtyRemark1Bar placer/c on crete worker52woodworker63Electricia n14Un skilled staff45Test con troller26Quality in spec

34、tor17Forema n18Loader driver29Crane operator210Lifti ng worker211Truck driver212Excavator operator113Roller operator1Pit backfillEquipme ntNoItemQtyRemark1vibrati on rob52crane13loader14roller15excavator16200kw gen erator1 or27water tank18Electric welding machine19Rein forceme nt process ing equipme

35、 nt1 set10Woodwork ing equipme nt1set11Con crete mixer312Water pump113gradie nter15, Attention of Bridge Substructure Concrete Construction(1) Con crete Tran sportConcrete transportation capability shall meet the requirement of concrete condensation rate and casting speed to ensure dispersion unifor

36、mity and regulated slump of concrete and continues casting. The loss of slump from mixing plant to casting shall less than 25%.(2) Concrete CastingA, No concrete shall be cast before support, formwork, reinforcement and embedded part are checked and recorded and meet design requirement. Sundries and

37、 water of formwork and dirt of reinforcement shall be removed. Form crack shall be sealed, and releasing agent shall be applied to formwork. Concrete uniformity and slump shall be examined before casting.B, Concrete shall be cast layer by layer according to certain thickness, sequence and direction.

38、 The upper layer shall be cast at the beginning of lower layer solidification. Should both layers commenced casting at the same time, the distance of which remains more than 1.5m. If concrete casting on inclined plane, it shall started form low to upper section gradually and keeping horizontal slici

39、ng.Concrete casting thickness no more than 500mm, and no less than quadruple size of the biggest aggregate.(3) Cast-in-place concrete shall be vibrated by vibration rob, except few plasticity concrete which could vibrate to dense by labor force,The following regulations shall be followed while vibra

40、tion rob applied to use.A, Plug-in vibration rob working space shall no more than 1.5time of its action radius, and shall keep 50-100mm from side form. The depth of rob plug in is 50-100mm. Rob shall be moved out slowly after finishing vibration to avoid impacting form, reinforcement and other embed

41、ded parts.B, The moving space of surface vibrator shall ensure vibration plate covering 100mm vibrated concrete.C, Concrete shall be vibrated to density for every part. The symbol of well vibrated concrete are no sinking and bubble, and surface of which is smooth and bleeding.(4) Concrete shall be c

42、ast continuously.If casting was interrupt for some reason, the period shall less than concrete initial curdle time or concrete retempering time of the front layer. The time of transporting, casting and break shall follow the requirement of the following form. Construction joint shall be reserved if

43、time out ofregulati on.(5) In process or after casting, water shall be drained away without stirring cast concrete if its bleeding in the surface of concrete. Measures shall be taken to avoid bleeding during continuous casting.Time for con crete tran sport, casti ng and break(Mi n)Stren gth grade of

44、 con creteTemperature 25 CTemperature25C三C30210180C30180150(6) the exposed surface of concrete shall be trimmed, troweled after finishing cast ing. Con crete shall be troweled aga in, and pressed polish or galled after con crete grout stabilized. Protect ion measuresshall be take n if large surface

45、exposed or bad weather condition happened. However, covering material shall not get in touch with con crete before its curi ng.(7) Specially-assig ned pers on shall be arran ged to check the stability of support, formwork, re in forceme nt and embedded parts etc, duri ng casti ng. Any parts beco min

46、g loose,out of shape or shift ing shall be fixed at on ce.(8) Con structio n record shall be made while cast ing con crete.6, Concrete Curing and Decoration(1) Concrete Curi ngA, As to con crete curi ng in site, the details of curi ng scheme shall be made and strictly adhere to accord ing to con str

47、uct ion works, en vir onment, ceme nt type, admixture and con crete performa nee.B, Con crete shall be covered and watered after con tracti on. Formwork shall keep wet duri ng curi ng.C, the time of concrete curing and mixing is the same.D, con crete shall be cured 7days no rmally, and the period co

48、uld prolong or shorte n accord ing to air humidity, temperature, ceme nt types and admixture. Wateri ng time shall be subject to the condition of keeping surface moist.E, Gunny bag coveri ng and wateri ng shall be applied to con crete curi ng.F, No pedestrian, transport machine and formwork shall be

49、 loaded before concrete strength reached to 2.5Mpa.(2) Concrete DecorationConcrete surface finish in different parts are dissimilar. The exposed surface without formwork shall be pressed polish and galled according to general specification if exposed surface without decoration. As to exposed surface

50、 with formwork shall install the same type formwork and apply the same release agent. Formwork shall be non-deforming, bright and clean without leakage. Any surface quality defect shall reported to relative department, and redecorating according to approval and indication.7, Access Road and Safety I

51、nsurance(1) , In order to insure construction safety and against theft, 1.8-2.0m fence shall be set around construction site. Traffic sign, roadblock and speed bump shall be set at 10m and 50m of both ends of abutment. Access road shall be set on the right side and construction vehicles pass through

52、 the left side(facing Kakamega direction) ,which aimed to reduce traffic jam( see attached chart).(2) , The construction team members shall be qualified and obey the construction rules. Mechanical equipment is forbidden to work with fault and overload operation. Sufficient lighting facility shall be

53、 equipment for night work.(3) , For the electric equipment on the site and the power line shall be in charged by appointed electrician. The distributor shall be fixed with earth leakage protective device. And regular inspection shall be carried out.(4) , Without the direction of appointed person, no

54、 vehicle shall be operated for construction.(5) , Mixing plant shall be check to meet the requirement of specification before starting operation.(6) , To prevent foundation pits collapse, all around pits shall be protected, and no heavy objects shall be stored around . Clear mark shall be set around

55、 pits in the night, such as colored lantern or lamp, to avoid accident happened.(7) , Protecting net, safety belts, safety helmet,guard railing shall be equipment for Working high above the ground. Construction shall not carry out without protection measures.(8) ,The following vehicle anti-skidding

56、measures shall be prepared during rain season: antiskid chain, paving aggregate or slag. Construction shall not carry out without protection measures.8, Quality Insurance(1) Construction action shall comply with the requirement of Kenya Road and Bridge Specification, the design drawing and bidding document.(2) To insure the quality of works,self-checking shall be made for each construction procedure. Each procedure shall be checked and examined by the