CN107313431A - Close on not contour foundation ditch method for synchronously constructing - Google Patents

Close on not contour foundation ditch method for synchronously constructing Download PDF

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Publication number
CN107313431A
CN107313431A CN201710652414.6A CN201710652414A CN107313431A CN 107313431 A CN107313431 A CN 107313431A CN 201710652414 A CN201710652414 A CN 201710652414A CN 107313431 A CN107313431 A CN 107313431A
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China
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deep basal
basal pit
shallow
foundation
wall
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CN107313431B (en
Inventor
刘国秀
王厚涛
赵宝锋
张振亚
蒋树锋
闫丁灿
张柯
程斌
安斌
曹露平
张小莉
张君
王政
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China Railway Tunnel Group Erchu Co Ltd
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China Railway Tunnel Group Erchu Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Foundations (AREA)

Abstract

Not contour foundation ditch method for synchronously constructing is closed on the present invention relates to one kind, the construction method is mainly comprised the following steps:Adjust the height of ground-connecting-wall and the position of bracing members, perform ground-connecting-wall, perform the stake of SMW engineering methods, perform SMW engineering method dowel crown beams and concrete support, deep basal pit cheats earth excavation to bracing members bottom with shallow foundation, set up bracing members, deep basal pit cheats earth excavation with shallow foundation, deep basal pit structure base slab is performed, bracing members is removed, performs deep basal pit structure side wall, synchronously perform deep basal pit structure roof, shallow foundation hole structure base slab, perform shallow foundation hole structure side wall, backfill deep basal pit top plate top cubic metre of earth, dismantling concrete support etc.;Construction method superior effect of the present invention is:The elevation of top surface of deep basal pit ground-connecting-wall is parallel with shallow foundation hole bottom, reduces the height of ground-connecting-wall, reduces the quantities of building enclosure;Deep basal pit, the earth excavation in shallow foundation hole and main structure construction are convenient, reduce process and repeat to change, it is to avoid cross-operation, improve effect.

Description

Close on not contour foundation ditch method for synchronously constructing
Technical field
The present invention relates to foundation pit construction technical field, it particularly relates to which one kind closes on not contour foundation ditch synchronous construction side Method.
Background technology
Open-cut foundation ditch construction technology is long-standing, but not contour foundation ditch is closed in two wires, three-line parallel, in open cut base Cheat more rare in engineering.How the linking of this class pit earthwork excavation and main structure construction is carried out, it is ensured that foundation pit construction Matter construction safety, construction speed, reduction engineering cost are the problems for being worth exploring.
Not contour foundation ditch crossing in Municipal Road Engineering is closed on easily to be encountered in river (river) Tunnel Engineering.In order to improve edge The benefited scope of the traffic of river (river) two sides, generally sets a plurality of import and export in two sides;It is a plurality of to import and export when importing, it will usually to produce Close on the appearance of not contour foundation ditch.
Close on not contour foundation ditch feature:Foundation ditch width about 30~50m, two lines and above neighbour, by different elevations gradually It is incorporated to main line.Its discrepancy in elevation for being incorporated to section is the progressive formation from a definite value to 0.For example, section is A, B circle to certain river-crossing tunnel on the bank Road and the parallel section of main line, length 100m, parallel foundation ditch, depth, agent structure are connected.
Close on not contour foundation ditch main line depth 12.2~12.9m, A ring road foundation ditch 3.3~12.9m, B ring road foundation ditch 4.4~ 12.9m.A ring roads foundation ditch and the main line foundation depth discrepancy in elevation 8.9~0m, B ring road foundation ditch and 7.8~0m of the main line foundation depth discrepancy in elevation. Main line foundation ditch both sides use underground continuous wall-enclosure structure, and both sides ring road is using SMW engineering methods stake building enclosure, and top sets coagulation Native branch tie distance 7m, middle part sets one of bracing members spacing 3.5m, agent structure side wall and the common wall of the side wall of ring road structure one.
According to design idea, foundation ditch construction method is a point hole construction, " first perform main line (dell) foundation ditch, after perform ring road (shallow hole) foundation ditch ";Its construction procedure is:Ground-connecting-wall → SMW engineering method stake → engineering method dowel crowns beam, concrete support → foundation ditch are totally opened Dig to ground-connecting-wall Guan Liang top → ground-connecting-wall Guan Liang → installation bracing members → main line (dell) excavation of foundation pit to bottom → main line (dell) Bottom plate → main line (dell) side wall → dismounting bracing members → main line top plate → secondary excavation ring road (shallow hole) the foundation ditch bottom of to → is abolished Bar planting → ring road (shallow hole) bottom plate → ring road is (shallow on the outside of ground-connecting-wall → main line (dell) side wall more than ring road (shallow hole) bottom plate Hole) side wall → perform ring road (shallow hole) top plate → dismantling concrete support.
Former design has following deficiency it can be seen from above process:
1, ring road (shallow hole) with below main line (dell) bracing members part can not synchronously excavate, cause construct ring road substrate Excavate, progress, long construction period after the completion of main line structure need to be treated.
2, ground-connecting-wall is removed during ring road structure construction, disturbance is big, while wasting the resources such as reinforcing bar, concrete.
3, the bar connecting condition of main line side wall and ring road bottom plate is poor, and bar planting workload is big, or reserved mechanical branch sleeve, Easy off normal and leakage are filled in.
The content of the invention
Not contour foundation ditch method for synchronously constructing is closed on it is an object of the invention to provide one kind, is deposited in the prior art with overcoming Drawbacks described above.
For achieving the above object, the technical scheme of construction method of the present invention is realized in:Make full use of Ground-connecting-wall, the supporting and retaining system ability of SMW engineering methods stake, by adjusting ground-connecting-wall height in the middle part of foundation ditch, adjustment second layer bracing members height is excellent It is achieved after changing support system.Due to two lines and the not contour foundation ditch of above neighbour, it will usually be increasingly incorporated into by different elevations Main line, its discrepancy in elevation for being incorporated to section is the progressive formation from a definite value to 0.Therefore, construction method of the present invention takes optimization to set Latter two typical section of meter scheme is described in detail, and a typical section is located at the start-up portion for being incorporated to section;One typical case is broken Face is located at the whole latter end for being incorporated to section, in order to clear, complete elaboration construction method of the present invention.
Construction method of the present invention includes the construction of the initial segment typical section and constructed with whole latter end typical section, specific steps It is as follows:
Step one, the initial segment typical section construction method:
Step 1, the position of the height of adjustment ground-connecting-wall and bracing members
(11) height of ground-connecting-wall is adjusted, the height of ground-connecting-wall is under ring road bottom plate all the time;
(12) position of bracing members is adjusted, when dell is more than more than 8.9m with the shallow hole discrepancy in elevation, the height of bracing members sets position In the ground-connecting-wall bottom of deep basal pit;When deep basal pit is less than 7.8m with the shallow foundation hole discrepancy in elevation, the height of bracing members, which is set, is located at shallow foundation hole Bottom plate top.
Step 2, ground-connecting-wall is performed
The job-hopping construction of ground-connecting-wall framing, using scouring machine grooving is grabbed, bentonite slurry retaining wall grooving is poured under water using double duct Concrete is built, lattice column, the support of support top concrete are inserted afterwards in place in ground-connecting-wall reinforcing bar cage hoisting.
Step 3, the stake of SMW engineering methods is performed
SMW engineering method pile driving constructions, first carry out three axes agitating pile construction, are inserted into shaped steel, and shaped steel insertion uses positioning guiding rack, To ensure shaped steel perpendicularity.
Step 4, SMW engineering method dowel crown beams and concrete support are performed
The stake of SMW engineering methods is checked with reisilometer, when engineering method stake intensity is more than or equal to design strength value, superelevation stake is abolished in progress Head operation, performs SMW engineering method dowel crown beams and concrete support.
Step 5, deep basal pit cheats earth excavation to bracing members bottom with shallow foundation
Step 5.1, deep basal pit and shallow foundation cheat the construction of earth excavation from the superficial to the deep, vertical layered, longitudinal divisionses, deep basal pit With the horizontal slope in shallow foundation hole connecting part, the ratio of slope of horizontal slope is 1:2~1:1;The thickness of layering is not more than 2m;
Step 5.2 is strong using the concrete of reisilometer Site Detection cubic metre of earth section Guan Liang to be dug and first layer concrete support Degree, concrete strength is more than or equal to design strength value, can just carry out the construction of this step.
Step 6, bracing members are set up
The erection of bracing members, completes the erection of bracing members in 48 hours of earth excavation to bracing members bottom.
Step 7, deep basal pit cheats earth excavation to bottom of foundation ditch with shallow foundation
Deep basal pit, shallow pit earthwork continue the vertical layered base pit elevation for excavating, being cheated to design deep basal pit, shallow foundation.
Step 8, deep basal pit structure base slab is performed
Deep basal pit bottom plate lead foot is performed using sizing punching block, performs height high according to the construction unified standard of lead foot template Degree;Deep basal pit underplate concrete placement layer by layer, 30~50cm of lift height.
Step 9, bracing members are removed
Deep basal pit underplate concrete pours completion and after its intensity reaches the 80% of design strength value, removes deep basal pit bottom plate Top bracing members.
Step 10, deep basal pit structure side wall is performed
Deep basal pit structure side wall is performed below height to shallow base plate of foundation pit, when the longitudinal slope that deep basal pit is cheated with shallow foundation differs Cause, cause side wall in same group two ends side wall height not wait when, then middle wall using bamboo slab rubber, back rib, to pull bar, steel pipe The formwork support structure of diagonal brace;Side wall is using big punching block, the formwork support structure of A-frame of shaping;Middle wall, side wall are mixed Solidifying soil is poured enters mould using automobile pump concrete, and concreting in lifts pours 30~50cm of thickness.
Step 11, synchronously perform deep basal pit structure roof and cheat structure base slab with shallow foundation
Deep basal pit structure roof, shallow foundation hole structure base slab are synchronously performed, the construction of deep basal pit structure roof uses scaffold branch Support body system, successively sets up from low to high, 60 × 90 × 120cm of step pitch, and panel is using wood glue plate, and the support of panel rib is using main stupefied and secondary Stupefied right-angled intersection is set up, point two layers of arrangement, and main stupefied using 10 × 10cm lumps of wood, secondary stupefied using 10 × 5cm lumps of wood, main stupefied Away from 60cm, secondary stupefied spacing 20cm, panel splicing is closely knit;Shallow base plate of foundation pit lead foot is performed using sizing punching block;According to first deep basal pit Shallow base plate of foundation pit concreting in lifts after top plate, 30~50cm of thickness of concreting in lifts.
Step 12, shallow foundation hole structure side wall is performed
Shallow foundation hole structure side wall is performed, shallow foundation foundation ditch faces foundation pit enclosure structure side using big punching block, the A-frame of shaping Formwork support structure, opposite side using bamboo slab rubber, back rib, to pull bar, the formwork support structure of steel pipe diagonal brace;Casting concrete Mould is entered using automobile pump concrete, concreting in lifts pours 30~50cm of thickness.
Step 13, backfill deep basal pit top plate top cubic metre of earth
After the side wall concrete on the inside of shallow foundation hole reaches design strength, backfill deep basal pit top plate top cubic metre of earth.
Step 14, dismantling concrete is supported
The dismounting of concrete support is removed using rope saw cut dismounting method, segmentation, and rest scaffold is set up before dismounting, Weight during concrete support cut-out is born, segmentation removes length according to the power and rest scaffold for selecting lifting appliance Weight capacity is determined;Backfilling of earthwork more than deep basal pit structure vault is completed after 50cm, dismantling concrete support.
Step 2, whole latter end typical section construction method:
Step 1 is identical with the initial segment construction procedure to 9.
Step 10, deep basal pit structure side wall and shallow foundation hole structure base slab are performed
Synchronously perform wall in deep basal pit structure side wall, shallow foundation hole structure base slab, deep basal pit and use bamboo slab rubber, back rib, to drawing The formwork support structure of bar, steel pipe diagonal brace;Deep basal pit side wall uses the formwork support structure for big punching block+A-frame of shaping; Shallow base plate of foundation pit lead foot is performed using sizing punching block, is performed height and is sought unity of standard highly according to lead foot template construction;Deep basal pit side Abutment wall cheats underplate concrete placement layer by layer, 30~50cm of lift height with shallow foundation.
Step 11, deep basal pit top plate is performed
Deep basal pit top board construction uses scaffold support structure, successively sets up from low to high, 60 × 90 × 120cm of step pitch, Panel uses wood glue plate, and the support of panel rib is main stupefied using 10 × 10cm side using main stupefied and time stupefied right-angled intersection, point two layers of arrangement Wood, secondary stupefied using 10 × 5cm lumps of wood, main stupefied spacing 60cm, secondary stupefied spacing 20cm, panel splicing is closely knit;Concreting is layered Pour, 30~50cm of thickness of concreting in lifts;
Step 12 is identical with the initial segment construction procedure to 14.
The beneficial effect of construction method of the present invention:
1, the elevation of top surface of deep basal pit ground-connecting-wall is parallel with shallow foundation hole bottom, reduces the height of ground-connecting-wall, reduces building enclosure Quantities;
2, deep basal pit, the earth excavation in shallow foundation hole and main structure construction are convenient, reduce process and repeat to change, it is to avoid intersect Operation, improves effect;
3, deep basal pit, the earth excavation in shallow foundation hole are excavated in place from top to bottom, once from earth's surface, are that main structure construction is carried For condition, Secondary Disturbance is reduced;From down to up, wall position is once constructed in place altogether, it is ensured that key position for main structure construction The integrality of structure, strengthens waterproof effect, improves construction quality.
Brief description of the drawings
Fig. 1 be optimization after closing foundation ditch be incorporated to section the initial segment typical structure cross section and agent structure piecemeal signal Figure;
Fig. 2 be optimization after closing foundation ditch be incorporated to section whole latter end typical body structure piecemeal schematic diagram.
Embodiment
With reference to Figure of description, the technical scheme to construction method of the present invention is clearly and completely described.
Construction method of the present invention, including the initial segment construction shown in Fig. 1 and whole latter end two ranks of construction shown in Fig. 2 Section.
Step one, the initial segment typical section construction procedure:
Step 1, the position of the height of adjustment ground-connecting-wall and bracing members:
(11) height of ground-connecting-wall 5 is adjusted, the height of ground-connecting-wall 5 is in the 2 of the first deep basal pit 1 and the second deep basal pit all the time Bottom plate below 40;
(12) position of bracing members is adjusted, the first deep basal pit 1 and the second deep basal pit 2 and the 3rd shallow foundation cheat the 3, the 4th shallow foundation hole When 4 discrepancy in elevation are more than more than 8.9m, the height of bracing members is set under the ground-connecting-wall 5 of the first deep basal pit 1 and the second deep basal pit 2 Portion;When first deep basal pit 1 and the second deep basal pit 2 and the 3rd shallow foundation cheat the 3, the 4th shallow foundation 4 discrepancy in elevation of hole less than 7.8m, the height of bracing members Degree, which is set, is located at the top of bottom plate 40 that the 3rd shallow foundation cheats the 3, the 4th shallow foundation hole 4.
Step 2, ground-connecting-wall is performed:
The job-hopping construction of ground-connecting-wall framing, using scouring machine grooving is grabbed, bentonite slurry retaining wall grooving is poured under water using double duct Build concrete;After the reinforcing bar cage hoisting of ground-connecting-wall 5 is in place, lattice column 6 is entered in the interpolation of ground-connecting-wall 5, and using the support of support top concrete.
Step 3, the stake of SMW engineering methods is performed:
SMW engineering methods stake 7 is constructed, and first carries out three axes agitating pile construction, is inserted into shaped steel, and shaped steel incorporation uses positioning and guiding Frame, to ensure shaped steel perpendicularity, shaped steel is inserted by deadweight, when relying on deadweight insertion shaped steel hindered, using vibration hammer Auxiliary sinks to inserting shaped steel.
Step 4, SMW engineering method dowel crown beams and concrete support are performed:
The stake of SMW engineering methods is checked using integrated type digital readout rebound tester, when engineering method stake intensity is more than or equal to design strength value, Abolish the pile crown operation of superelevation engineering method stake, perform SMW engineering method dowel crowns beam 8 and concrete support 9.
Step 5, the first deep basal pit 1, the second deep basal pit 2, the 3rd shallow foundation cheat the 3, the 4th shallow foundation and cheat 4 earth excavations to bracing members Bottom:
First deep basal pit 1, the second deep basal pit 2, the 3rd shallow foundation cheat the 3, the 4th shallow foundation and cheat 4 earth excavations to bracing members bottom, Earth excavation is constructed from the superficial to the deep, vertical layered, longitudinal divisionses, the first deep basal pit 1 and the first shallow foundation hole 3 and the second deep basal pit 2 and second shallow foundation cheat the horizontal slope in 4 connecting parts, the ratio of slope of horizontal slope is 1:2~1:1;Vertical layered thickness is not more than 2m。
Step 6, bracing members are set up:
With digging with frame bracing members in digging process, prestressing force is applied while setting up bracing members.
Step 7, the first deep basal pit 1, the second deep basal pit 2 and the 3rd shallow foundation cheat the 3, the 4th shallow foundation and cheat 4 earth excavations:
First deep basal pit 1, the second deep basal pit 2 and the 3rd shallow foundation cheat the earth excavation in the 3, the 4th shallow foundation hole 4 to bottom of foundation ditch 20cm scopes on absolute altitude, are excavated using excavator.
Step 8, the first deep basal pit 1, the structure base slab of the second deep basal pit 2 are performed:
First deep basal pit 1, the lead foot template of the structure base slab of the second deep basal pit 2 are performed using sizing punching block, the first deep base Cheat the placement layer by layer of concrete 10 of the structure base slab of the 1, second deep basal pit 2,30~50cm of lift height.
Step 9, bracing members are removed:
Bracing members are removed to be removed using hand fit's crane, and crane rear, wire line hitch in place pricks bracing members, and it is active that button is pricked Jack is laid in section and applies top power, gad block is removed and releases top power, while unloading jack, hang out bracing members.
Step 10, the first deep basal pit 1, the structure side wall of the second deep basal pit 2 are performed:
First deep basal pit 1, the side wall 30 of the second deep basal pit 2 are performed highly to structure base slab below 40;First deep basal pit 1st, the middle wall 20 of the second deep basal pit 2 is using bamboo slab rubber, back rib, to pull bar, the formwork support structure of steel pipe diagonal brace;Side wall 30 is adopted With sizing punching block, the formwork support structure of A-frame;Middle wall 20, the concreting of side wall 30 use automobile pump concrete Enter mould, concreting in lifts pours 30~50cm of thickness.
Step 11, the first deep basal pit 1, the structure roof of the second deep basal pit 2 are synchronously performed, the 3rd shallow foundation cheats the 3, the 4th shallow foundation hole 4 structure base slabs 40:
The first deep basal pit 1, the structure roof of the second deep basal pit 2 are synchronously performed, the 3rd shallow foundation cheats the 3, the 4th shallow foundation and cheats 4 structure bottoms Plate 40, the first deep basal pit 1, the construction of the structure roof of the second deep basal pit 2 use scaffold support system, successively set up from low to high, 60 × 90 × 120cm of step pitch, panel uses wood glue plate, and the support of panel rib is set and point two layers of cloth using main stupefied and time stupefied right-angled intersection Put, main stupefied using 10 × 10cm lumps of wood, secondary stupefied using 10 × 5cm lumps of wood, main stupefied spacing 60cm, secondary stupefied spacing 20cm, panel is spelled Connect closely knit;3rd shallow foundation is cheated the 3, the 4th shallow foundation 4 lead foots of hole and performed using sizing punching block, height is performed, according to lead foot template construction Unified standard height is performed;Concreting placement layer by layer, first first deep basal pit 1, the structure roof of the second deep basal pit 2, the rear 3rd Shallow foundation cheats the 3, the 4th shallow foundation and cheats 4 structure base slabs 40,30~50cm of placement layer by layer thickness.
Step 12, perform the 3rd shallow foundation and cheat 4 structure side walls 50 of the 3, the 4th shallow foundation hole:
The structure side wall 50 that the 3rd shallow foundation cheats the 3, the 4th shallow foundation hole 4 is performed, the building enclosure of structure side wall 50 is using fixed The formwork support structure of shaped steel mould, A-frame, opposite side is using bamboo slab rubber, back rib, to pull bar, the shuttering supporting of steel pipe diagonal brace Structure, pours and enters mould, concreting in lifts, 30~50cm of casting concrete thickness using automobile pump concrete.
Step 13, the first deep basal pit 1 of backfill, the structure roof top of the second deep basal pit 2 cubic metre of earth:
Back-filling in layers the first deep basal pit 1, the structure roof top of the second deep basal pit 2 cubic metre of earth, the structure top of layered rolling backfill Used in the range of plate top cubic metre of earth, structure roof both sides and structure roof above 50cm and roll equipment compacting.
Step 14, dismantling concrete support 9:
The dismounting of concrete support 9 is removed using rope sawing, segmentation, rest scaffold is set up before dismounting, bears to mix Weight during soil support cut is coagulated, segmentation remove length according to from the ability of lifting appliance and holding for rest scaffold Beijing South Maxpower Technology Co. Ltd's power is determined.
Step 2, whole latter end construction procedure is as follows:
Step 1-9 is identical with the initial segment.
Step 10, the first deep basal pit 1, the structure side wall 30 of the second deep basal pit 2 and the 3rd shallow foundation are performed and cheats the 3, the 4th shallow foundation Cheat 4 structure base slabs:
Synchronously perform the first deep basal pit 1, the structure side wall 30 of the second deep basal pit 2 and the 3rd shallow foundation and cheat the 3, the 4th shallow foundation hole Wall 70 is using bamboo slab rubber, back rib, to pull bar, the mould of steel pipe diagonal brace in 4 structure base slabs 80, the first deep basal pit 1, the second deep basal pit 2 Board supporting structure;First deep basal pit 1, the structure side wall of the second deep basal pit 2 are using big punching block, the shuttering supporting of A-frame of shaping Structure;3rd shallow foundation cheats the 3, the 4th shallow foundation hole lead foot of 4 structure base slab 80 using sizing punching block manufacture;First deep basal pit 1, second is deep The structure side wall 30 of foundation ditch 2 and the 3rd shallow foundation cheat the concreting in lifts that the 3, the 4th shallow foundation cheats 4 structure base slabs 80, concrete point Layer pours 30~50cm of thickness.
Step 11, the first deep basal pit 1, the structure roof 90 of the second deep basal pit 2 are performed:
Using scaffold support body structure, the first deep basal pit 1, the structure roof 90 of the second deep basal pit 2, scaffold support are performed Body structure is successively set up from low to high, 60 × 90 × 120cm of step pitch, and panel is using wood glue plate, and the support of panel rib is using main stupefied and secondary Stupefied right-angled intersection, point of two layers arrangement, it is main it is stupefied use 10 × 10cm lumps of wood, it is secondary it is stupefied made using 10 × 5cm lumps of wood, main stupefied spacing 60cm, secondary stupefied interval 20cm;Deep first deep basal pit 1 of placement layer by layer, the concrete of the structure roof 90 of the second deep basal pit 2, layering are poured Concrete thickness is built for 30-50cm.
Step 12-14 is consistent with starting section constructing method.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.

Claims (3)

1. one kind closes on not contour foundation ditch method for synchronously constructing, it is characterised in that the construction method step is as follows:
Step one, the initial segment typical section construction method:
Step 1, the position of the height of adjustment ground-connecting-wall and bracing members
(11) height of ground-connecting-wall is adjusted, the height of ground-connecting-wall is under ring road bottom plate all the time;
(12) position of bracing members is adjusted, when dell is more than more than 8.9m with the shallow hole discrepancy in elevation, the height of bracing members is set positioned at deep The ground-connecting-wall bottom in hole;When dell is less than 7.8m with the shallow hole discrepancy in elevation, the height of bracing members, which is set, is located at shallow hole bottom plate top;
Step 2, ground-connecting-wall is performed
The job-hopping construction of ground-connecting-wall framing, using scouring machine grooving is grabbed, bentonite slurry retaining wall grooving is mixed using double duct underwater casting Solidifying soil, lattice column, the support of support top concrete are inserted in ground-connecting-wall reinforcing bar cage hoisting afterwards in place;
Step 3, the stake of SMW engineering methods is performed
SMW engineering method pile driving constructions, first carry out three axes agitating pile construction, are inserted into shaped steel, and shaped steel insertion uses positioning guiding rack, to protect Demonstrate,prove shaped steel perpendicularity;
Step 4, SMW engineering method dowel crown beams and concrete support are performed
The stake of SMW engineering methods is checked with reisilometer, when engineering method stake intensity is more than or equal to design strength value, superelevation pile crown work is abolished in progress Industry, performs SMW engineering method dowel crown beams and concrete support;
Step 5, deep basal pit cheats earth excavation to bracing members bottom with shallow foundation
Step 5.1, deep basal pit and shallow foundation cheat the construction of earth excavation from the superficial to the deep, vertical layered, longitudinal divisionses, deep basal pit with it is shallow Foundation ditch connecting part transverse direction slope, the ratio of slope of the horizontal slope is 1:2~1:1;The thickness of the layering is not more than 2m;
Step 5.2 uses the intensity of the concrete of reisilometer Site Detection cubic metre of earth section Guan Liang to be dug and first layer concrete support, Concrete strength is more than design strength value, can just carry out the construction of this step;
Step 6, bracing members are set up
The erection of bracing members, completes the erection of bracing members in 48 hours of earth excavation to bracing members bottom;
Step 7, deep basal pit, shallow foundation cheat earth excavation to bottom of foundation ditch
Deep basal pit, shallow pit earthwork continue the vertical layered base pit elevation for excavating, being cheated to design deep basal pit, shallow foundation;
Step 8, deep basal pit structure base slab is performed
Deep basal pit bottom plate lead foot is performed using sizing punching block, is performed height and is sought unity of standard highly according to the construction of lead foot template;It is deep Base plate of foundation pit concreting in lifts, 30~50cm of lift height;
Step 9, bracing members are removed
Deep basal pit underplate concrete pours completion and after its intensity reaches the 80% of design strength value, removes deep basal pit bottom plate top Bracing members;
Step 10, deep basal pit structure side wall is performed
Deep basal pit structure side wall is performed below height to shallow base plate of foundation pit, and the longitudinal slope in deep basal pit and shallow foundation hole is inconsistent, causes Side wall in same group two ends side wall height not situations such as occur, then middle wall using bamboo slab rubber, back rib, to pull bar, steel pipe The formwork support structure of diagonal brace;Side wall is using big punching block, the formwork support structure of A-frame of shaping;Middle wall, side wall are mixed Solidifying soil is poured enters mould using automobile pump concrete, and concreting in lifts pours 30~50cm of thickness;
Step 11, deep basal pit structure roof, shallow foundation hole structure base slab are synchronously performed
Deep basal pit structure roof, shallow foundation hole structure base slab are synchronously performed, the construction of deep basal pit structure roof uses scaffold support knot Structure, successively sets up from low to high, 60 × 90 × 120cm of step pitch, and panel uses master stupefied and secondary stupefied ten using wood glue plate, the support of panel rib Word, which intersects, to be set up, divides two layers of arrangement;Shallow base plate of foundation pit lead foot is performed using sizing punching block;Cheated according to shallow foundation after first deep basal pit top plate Bottom plate concreting in lifts, 30~50cm of thickness of concreting in lifts;
Step 12, shallow foundation hole structure side wall is performed
Shallow foundation hole structure side wall is performed, shallow foundation foundation ditch faces foundation pit enclosure structure side using big punching block, the mould of A-frame of shaping Board supporting structure, opposite side is using bamboo slab rubber, back rib, to pull bar, the formwork support structure of steel pipe diagonal brace;Casting concrete is used Automobile pump concrete enters mould, and concreting in lifts pours 30~50cm of thickness;
Step 13, backfill deep basal pit top plate top cubic metre of earth
After the side wall concrete on the inside of shallow foundation hole reaches design strength, backfill deep basal pit top plate top cubic metre of earth;
Step 14, dismantling concrete is supported
The dismounting of concrete support is removed using rope saw cut dismounting method, segmentation, rest scaffold is set up before dismounting, is born Load-bearing of the length according to power and rest scaffold from lifting appliance is removed in weight when concrete support is cut off, segmentation Ability is determined;Backfilling of earthwork more than deep basal pit structure vault is completed after 50cm, dismantling concrete support;
Step 2, whole latter end typical section construction method:
Step 1 is identical with the initial segment construction procedure to 9;
Step 10, deep basal pit structure side wall and shallow foundation hole structure base slab are performed
Synchronously perform deep basal pit structure side wall, shallow foundation hole structure base slab, in deep basal pit wall using bamboo slab rubber, back rib, to pull bar, The formwork support structure of steel pipe diagonal brace;Deep basal pit side wall uses the formwork support structure for big punching block+A-frame of shaping;Shallow foundation is cheated Bottom plate lead foot is performed using sizing punching block, performs height, is sought unity of standard highly according to lead foot template construction;Deep basal pit side wall with it is shallow Base plate of foundation pit concreting in lifts, 30~50cm of lift height;
Step 11, perform deep basal pit structure roof and cheat structure base slab with shallow foundation
The construction of deep basal pit structure roof uses scaffold support structure, successively sets up from low to high, 60 × 90 × 120cm of step pitch, Panel uses wood glue plate, and the support of panel rib is using main stupefied and time stupefied right-angled intersection, point two layers of arrangement;Concreting placement layer by layer, 30~50cm of thickness of concreting in lifts;Shallow foundation hole structure base slab lead foot is performed using sizing punching block;According to first deep basal pit Shallow base plate of foundation pit concreting in lifts after top plate, 30~50cm of thickness of concreting in lifts;
Step 12 is identical with the initial segment construction procedure to 14.
2. construction method according to claim 1, it is characterised in that deep basal pit described in step 5 cheats connecting part with shallow foundation The ratio of slope of horizontal slope is 1:2~1:1.
3. construction method according to claim 1, it is characterised in that main stupefied using 10 × 10cm lumps of wood described in step 11, It is secondary stupefied using 10 × 5cm lumps of wood, main stupefied spacing 60cm, secondary stupefied spacing 20cm.
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CN109440774A (en) * 2018-12-27 2019-03-08 上海建工七建集团有限公司 A kind of foundation pit structure and its construction method
CN109706937A (en) * 2018-12-26 2019-05-03 中国水利水电第八工程局有限公司 It is a kind of for intersecting the node supporting construction and construction method of foundation pit synchronous construction
CN110670597A (en) * 2019-10-08 2020-01-10 中铁开发投资集团有限公司 Reasonable excavation method for deep and large foundation pit under water-rich round gravel condition
CN110714467A (en) * 2019-10-29 2020-01-21 南京同力建设集团股份有限公司 Deep foundation pit supporting system
CN111501768A (en) * 2020-04-29 2020-08-07 中国建筑第八工程局有限公司 Method for synchronous construction of deep and shallow foundation pit groups
CN111560964A (en) * 2020-05-29 2020-08-21 北京市地质工程公司 Construction method of rear anti-seepage system of foundation pit
CN113530357A (en) * 2021-07-07 2021-10-22 中建八局第四建设有限公司 Symmetrical mutual-pulling type construction method pile enclosure structure
CN114482072A (en) * 2022-03-04 2022-05-13 西南交通大学 Soft soil close-connection double-foundation-pit combined anchor design method, supporting structure and construction method
CN114645545A (en) * 2022-03-01 2022-06-21 中国电建集团华东勘测设计研究院有限公司 Enclosure structure and method for synchronous excavation of small-clear-distance adjacent foundation pits in soft soil area
CN114703861A (en) * 2022-03-30 2022-07-05 中国建筑第八工程局有限公司 Double-foundation-pit construction method with shared supporting piles
CN114922195A (en) * 2022-05-23 2022-08-19 上海建工一建集团有限公司 Construction method of soft soil deep and large foundation pit adjacent to protected object
CN115125960A (en) * 2022-08-05 2022-09-30 中建市政工程有限公司 Common foundation pit excavation method for adjacent foundation pits with different bottom elevations

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CN108978676A (en) * 2018-09-04 2018-12-11 北京市机械施工有限公司 A kind of construction method of foundation pit group and basic pile group
CN108978676B (en) * 2018-09-04 2020-08-14 北京市机械施工有限公司 Construction method of foundation pit group and foundation pile group
CN109706937A (en) * 2018-12-26 2019-05-03 中国水利水电第八工程局有限公司 It is a kind of for intersecting the node supporting construction and construction method of foundation pit synchronous construction
CN109440774A (en) * 2018-12-27 2019-03-08 上海建工七建集团有限公司 A kind of foundation pit structure and its construction method
CN110670597A (en) * 2019-10-08 2020-01-10 中铁开发投资集团有限公司 Reasonable excavation method for deep and large foundation pit under water-rich round gravel condition
CN110714467A (en) * 2019-10-29 2020-01-21 南京同力建设集团股份有限公司 Deep foundation pit supporting system
CN111501768A (en) * 2020-04-29 2020-08-07 中国建筑第八工程局有限公司 Method for synchronous construction of deep and shallow foundation pit groups
CN111501768B (en) * 2020-04-29 2022-03-01 中国建筑第八工程局有限公司 Method for synchronous construction of deep and shallow foundation pit groups
CN111560964B (en) * 2020-05-29 2020-12-22 北京市地质工程公司 Construction method of rear anti-seepage system of foundation pit
CN111560964A (en) * 2020-05-29 2020-08-21 北京市地质工程公司 Construction method of rear anti-seepage system of foundation pit
CN113530357A (en) * 2021-07-07 2021-10-22 中建八局第四建设有限公司 Symmetrical mutual-pulling type construction method pile enclosure structure
CN113530357B (en) * 2021-07-07 2022-04-26 中建八局第四建设有限公司 Symmetrical mutual-pulling type construction method pile enclosure structure
CN114645545A (en) * 2022-03-01 2022-06-21 中国电建集团华东勘测设计研究院有限公司 Enclosure structure and method for synchronous excavation of small-clear-distance adjacent foundation pits in soft soil area
CN114482072A (en) * 2022-03-04 2022-05-13 西南交通大学 Soft soil close-connection double-foundation-pit combined anchor design method, supporting structure and construction method
CN114482072B (en) * 2022-03-04 2023-01-31 西南交通大学 Soft soil close-connection double-foundation-pit combined anchor design method, supporting structure and construction method
CN114703861A (en) * 2022-03-30 2022-07-05 中国建筑第八工程局有限公司 Double-foundation-pit construction method with shared supporting piles
CN114922195A (en) * 2022-05-23 2022-08-19 上海建工一建集团有限公司 Construction method of soft soil deep and large foundation pit adjacent to protected object
CN115125960A (en) * 2022-08-05 2022-09-30 中建市政工程有限公司 Common foundation pit excavation method for adjacent foundation pits with different bottom elevations

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