CN106436749B - A kind of method of underwater splicing U-type groove construction subway station - Google Patents

A kind of method of underwater splicing U-type groove construction subway station Download PDF

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Publication number
CN106436749B
CN106436749B CN201610817122.9A CN201610817122A CN106436749B CN 106436749 B CN106436749 B CN 106436749B CN 201610817122 A CN201610817122 A CN 201610817122A CN 106436749 B CN106436749 B CN 106436749B
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type groove
underwater
fender post
splicing
foundation pit
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CN106436749A (en
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王国富
曹正龙
路林海
李罡
唐卓华
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Jinan Rail Transit Group Co Ltd
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Jinan Rail Transit Group Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Revetment (AREA)

Abstract

The invention discloses a kind of method of underwater splicing U-type groove construction subway station, in the cement mixing pile of foundation pit periphery construction single shaft, and section is pressed into design position for I-shaped prefabricated pile along the axis direction of cement mixing pile before the soil cement solidification of each cement mixing pile；Foundation pit is excavated, anchor cable of constructing；Each fender post soil-cement body on the inside of foundation pit nearby is rejected, exposes the recess of fender post as U-type groove bayonet；Recess along fender post places the U-type groove of most termination, Prefabricated end wall then is pressed in termination U-type groove side along the recess of I-shaped fender post, and Prefabricated end wall is fixed using anchor cable；It is arranged in order and places prefabricated U type groove, place the Prefabricated end wall of foundation pit opposite side, forms box-structure；The equal ejection for water plugging in box-structure gap that will have spliced；The overall laying water-proof coiled material on the inside of box-structure, cast in situs station overlapping bottom plate, side wall, while pour the concrete of station column；Finally pour the concrete of top plate.

Description

A kind of method of underwater splicing U-type groove construction subway station
Technical field
The invention belongs to underground structrue engineering field, more particularly to one kind to build subway station under water using prefabricated U type groove The construction method of base pit engineering.
Background technology
Conventional Metro station excavation is mostly the sleeve configuration foundation pit of width about 20m, and the general 17 ~ 25m of depth, often meets underground Water, in urban district, extensive precipitation causes the case of the engineering accidents such as surface subsidence, building inclination more.And for some undergrounds The more rich area of water, also cannot effectively control water level to use underwater construction below excavation face using curtain precipitation, but It is that there are problems for underwater construction：Concrete placed under water complex procedures, quality are difficult to ensure that, while polluted water resources.
The content of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, there is provided one kind is built under water using prefabricated U type groove The construction method of subway foundation pit engineering.The underwater excavation earthwork is first used using prefabricated fender post, then using prefabricated U type groove in water Under be spliced into semiclosed sealing case, reduce to influence on groundwater, improve construction efficiency and concrete quality, promote underground engineering production Industry process.
To achieve the above object, the present invention uses following technical proposals：
A kind of method of underwater splicing U-type groove construction subway station, comprises the following steps：
Step 1）In the cement mixing pile of foundation pit periphery construction single shaft, cement mixing pile is set to form a circle around whole foundation pit, And before the soil cement solidification of each cement mixing pile it is I-shaped prefabricated pile along cement mixing pile by section Axis direction is pressed into design position, forms fender post；Excavation of foundation pit enclosure wall is formed between each fender post；
Scheme as an optimization, the cement mixing pile are co-axially mounted with I-shaped prefabricated pile.
Step 2）Foundation pit is excavated, while fender post is fixed in anchor cable of constructing；
Scheme as an optimization, when to excavation of foundation pit, underwater excavation is taken in the earthwork below water level, and takes and hang between stake Bar-mat reinforcement ensures that the soil body does not cave in.
Step 3）, reject each fender post soil-cement body on the inside of foundation pit nearby, expose the recess of fender post as U-type groove card Mouthful, and the height of U-type groove is higher than level of ground water.
Scheme as an optimization, for convenience of clearing up, can place pine in I-shaped fender post recess and first fill, the later stage is direct Take out, and slip casting is tamped being put into after U-type groove in gap.
Step 4）Recess along fender post places the U-type groove of most termination, then by Prefabricated end wall along the recessed of fender post Mouth is pressed in termination U-type groove side, and Prefabricated end wall is fixed using anchor cable, it is not toppled over；
Scheme as an optimization, termination U-type groove leave a gap with Prefabricated end wall lap-joint, microdilatancy are injected in gap Waterproof mortar, improves the water resistance of seam crossing.
Step 5）, be arranged in order place prefabricated U type groove, finally place foundation pit opposite side Prefabricated end wall, eventually form The box-structure of square open type.
Scheme as an optimization, U-type groove side sheet room are overlapped with two kinds of forms, and one kind is to stay middle hole between biside plate, in U Type groove injects microdilatancy waterproof mortar after being put into designated position；Another kind is that biside plate is thinning in marginal position, is pouring station During interior wall, thickness of cast-in-place concrete can be thickeied here；Two methods can improve the integral waterproofing performance of station structure.
Scheme as an optimization, when U-type groove bottom plate overlaps, has overlap using flexible water bar filling sealing, in adjacent U Gap is left between type groove bottom plate, splicing difficulty is on the one hand reduced, on the other hand can increase this when pouring underplate concrete in the later stage The infiltration path at place, improves station waterproof slab performance.
Step 6）, the equal ejection for water plugging in box-structure gap that will splice, then the water in it is drained, local leak Water blockoff is taken to close measure in place.
Step 7）, in dry environments, the overall laying water-proof coiled material on the inside of box-structure, cast in situs station overlapping bottom Plate, side wall, while pour the concrete of station column；
Step 8）, finally pour the concrete of top plate, when pouring concrete roof, to connect with prefabricated I-shaped fender post Connect, the anti-floating ability at station is improved using capping beam.
Scheme as an optimization, the U-type groove include a bottom plate and are structure as a whole with bottom plate and symmetrically arranged Two side plates, are equipped with the fin with the mating recesses of fender post in the outside of two side plates, are equipped with and use in the both sides of two side plates In the groove that middle hole is formed with adjacent U-type groove.
Scheme as an optimization, the U-type groove include a bottom plate and are structure as a whole with bottom plate and symmetrically arranged Two side plates, the fin with the mating recesses of fender post, the margin location of described two side plates are equipped with the outside of two side plates Put thinning.
Scheme as an optimization, the side of the bottom plate of the U-type groove are equipped with the overlap for being used for adjacent U-type groove overlap joint.
Beneficial effects of the present invention are：
（1）Subway station is built after the deep basal pit underwater excavation that the present invention can not be handled for underground water, using pre- in advance The assembled block made is assembled under water, on level of ground water without influence, simultaneously because piece is pre-formed, causes without cast-in-place under water The problems such as cement grout is lost in, it is pollution-free to groundwater resources.
（2）The prefabricated components that the present invention uses bind in preferable environment, pour, conserve and form, when its Quality is better than live underwater casting component, and endurance quality is improved；Second, construction is obtained without maintenance, foundation pit site operation speed To raising；Third, the later stage can overlap with cast-in-place structural, effectively thinned cast-in-place structural thickness, saves engineering material.
Brief description of the drawings
Fig. 1 is foundation pit enclosure structure schematic diagram；
Fig. 2 is to excavate to complete schematic diagram；
Fig. 3 is assembled U-type groove top view；
Fig. 4 is termination U-type groove and the corner connection figure of headwall；
Fig. 5 a are the interface diagrams of adjacent U-type groove side sheet room；
Fig. 5 b are the interface diagrams of another adjacent U-type groove side sheet room；
Fig. 6 is the interface diagram between adjacent U-type groove bottom plate；
Fig. 7 is assembled U-type groove profile；
Fig. 8 be it is cast-in-place after the completion of station structure schematic diagram；
Fig. 9 is U-type groove axis side view.
In figure：1 is mixing pile, and 2 be I-shaped prefabricated pile, and 3 be anchor cable, and 4 be U-type groove side, and 4a is U-type groove side plate, 4b It is U-type groove bottom plate, 5 be Prefabricated end wall, and 6 be the injection mortar of boxing out between termination U-type groove and Prefabricated end wall, and 7 be U-type groove side plate Between injection mortar of boxing out, 8 be flexible water bar, and 9 be station overlapping bottom plate, and 10 be station side wall, and 11 be station column, 12 tops Plate, 13 capping beams.
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings：
First, the present invention relates to main device include cement mixing pile, I-shaped prefabricated pile and U-type groove；Wherein Cement mixing pile uses the cement mixing pile of diameter 1.1m, is stirred before solidification and by section for I-shaped prefabricated pile along cement The axis method for mixing stake is mutually pressed into the design position of cement mixing pile, forms fender post.
The structure of the U-type groove includes two kinds：
One kind is：U-type groove includes a bottom plate and is structure as a whole with bottom plate and symmetrically arranged two side plates, two The outside of a side plate is equipped with the fin with the mating recesses of fender post, is equipped with and is used for and adjacent U-type groove in the both sides of two side plates The groove of hole among being formed（As shown in Figure 5 b）；The side of the bottom plate of the U-type groove, which is equipped with, is used for taking for adjacent U-type groove overlap joint Socket part point.
Another kind is：The U-type groove includes a bottom plate and is structure as a whole with bottom plate and two symmetrically arranged Side plate, the fin with the mating recesses of fender post is equipped with the outside of two side plates, and the marginal position of described two side plates becomes It is thin（As shown in Figure 5 a）；The side of the bottom plate of the U-type groove is equipped with the overlap for being used for adjacent U-type groove overlap joint.
The method being wherein embodied using above device, is not taken dewatering measure to carry out earth excavation, applied at the same time Work anchor cable 3, hang bar-mat reinforcement, ensures base pit stability.
It is as follows：
Step 1, such as Fig. 1, by section are I-shaped before soil cement solidification in foundation pit periphery construction single shaft cement mixing pile 1 The prefabricated pile 2 of type is pressed into design position, and fender post is formed after single shaft cement mixing pile 1 and the combination of I-shaped prefabricated pile 2, until Fender post forms a circle around whole foundation pit, forms excavation of foundation pit enclosure wall.
Step 2, such as Fig. 2, carry out earth excavation, while anchor cable 3 of constructing, fix fender post；Water is taken below water level Lower excavation, and take and bar-mat reinforcement is hung between stake ensure that the soil body does not cave in.
Step 3, such as Fig. 2 and Fig. 3, reject fender post soil-cement body on the inside of foundation pit nearby, expose I-shaped fender post（With enclosing Fender pile is referring to same component）Bayonet of the recess as U-type groove side plate 4a, prevent U-type groove from being glanced off in decentralization process, The height of U-type groove is higher than 1 ~ 2m of level of ground water.
Scheme as an optimization, for convenience of clearing up, can place pine in I-shaped fender post recess and first fill, the later stage is direct Take out, and slip casting is tamped being put into after U-type groove in gap.
Step 4, such as Fig. 3, the recess along I-shaped fender post 2 places the U-type groove 4 of most termination, then by Prefabricated end wall 5 Termination U-type groove side is pressed in along the recess of I-shaped fender post, and Prefabricated end wall 5 is fixed using anchor cable 3, it is not occurred Topple over.
Scheme as an optimization, such as Fig. 4, termination U-type groove 4 leave a gap with 5 lap-joint of Prefabricated end wall, are noted in gap Enter microdilatancy waterproof mortar, improve the water resistance of seam crossing；Note of boxing out between termination U-type groove and Prefabricated end wall as depicted Enter mortar 6；
Step 5, be arranged in order and place prefabricated U type groove 4, finally places the Prefabricated end wall of foundation pit opposite side, eventually forms The box-structure of square open type.
Scheme as an optimization, is overlapped with two kinds of forms between U-type groove side plate 4a：
One kind is to stay middle hole between biside plate, and such as Fig. 5 a, microdilatancy Waterproof sand is injected after U-type groove is put into designated position Slurry, which are directed to the first U-type groove structure recited above；
Another kind is that biside plate is thinning in marginal position, as the U-type groove side sheet room in Fig. 5 b box out injection mortar 7, When pouring station interior wall, thickness of cast-in-place concrete can be thickeied here；Two methods can improve the integral waterproofing of station structure Performance.
Scheme as an optimization, when U-type groove bottom plate 4b is overlapped, such as Fig. 6, has overlap to stop using the filling of flexible water bar 8 Water, leaves gap between two pieces of U-type groove bottom plate 4b, on the one hand reduces splicing difficulty, bottom plate coagulation is on the other hand poured in the later stage Infiltration path herein can be increased when native, improve station waterproof slab performance.
Step 6, the equal ejection for water plugging in box-structure gap that will have spliced, then drain the water in it, local leak Water blockoff is taken to close measure in place.
Step 7, in dry environments, the overall laying water-proof coiled material on the inside of box-structure, cast in situs station overlapping bottom Plate 9, station side wall 10, while pour the concrete of station column 11.
Step 8, the concrete for finally pouring top plate 12, be with prefabricated I-shaped fender post 1 when pouring concrete roof Connection, the anti-floating ability at station is improved using capping beam 13.
Although above-mentioned be described the embodiment of the present invention with reference to attached drawing, model not is protected to the present invention The limitation enclosed, those skilled in the art should understand that, on the basis of technical scheme, those skilled in the art are not Need to make the creative labor the various modifications that can be made or deformation still within protection scope of the present invention.

Claims (10)

  1. A kind of 1. method of underwater splicing U-type groove construction subway station, it is characterised in that comprise the following steps：
    Step 1) foundation pit periphery construction single shaft cement mixing pile, cement mixing pile is formed a circle around whole foundation pit, and It is each axis of the I-shaped prefabricated pile along cement mixing pile by section before the soil cement solidification of the cement mixing pile Direction is pressed into design position, forms fender post；Excavation of foundation pit enclosure wall is formed between each fender post；
    Step 2) excavates foundation pit, while fender post is fixed in anchor cable of constructing；
    Step 3) rejects each fender post soil-cement body on the inside of foundation pit nearby, exposes the recess of fender post as U-type groove bayonet, and The height of U-type groove is higher than level of ground water；
    Step 4) places the U-type groove of most termination along the recess of fender post, then the recess pressure by Prefabricated end wall along fender post Fixed in termination U-type groove side, and by Prefabricated end wall using anchor cable；
    Step 5) is arranged in order placement U-type groove, finally places the Prefabricated end wall of foundation pit opposite side, eventually forms upper opening formula Box-structure；
    The equal ejection for water plugging in box-structure gap that step 6) will have been spliced, then drains the water in it；
    In dry environments, overall laying water-proof coiled material, cast in situs station overlap bottom plate, side to step 7) on the inside of box-structure Wall, while pour the concrete of station column；
    Step 8) finally pours the concrete of top plate, when pouring concrete roof, to be connected with prefabricated I-shaped fender post, profit The anti-floating ability at station is improved with capping beam.
  2. 2. the method for underwater splicing U-type groove construction subway station as claimed in claim 1, it is characterised in that the U-type groove It is structure as a whole including a bottom plate and with bottom plate and symmetrically arranged two side plates, is equipped with the outside of two side plates with enclosing The fin of the mating recesses of fender pile, the groove for being used for that middle hole to be formed with adjacent U-type groove is equipped with the both sides of two side plates.
  3. 3. the method for underwater splicing U-type groove construction subway station as claimed in claim 1, it is characterised in that the U-type groove It is structure as a whole including a bottom plate and with bottom plate and symmetrically arranged two side plates, is equipped with the outside of two side plates with enclosing The fin of the mating recesses of fender pile, the marginal position of described two side plates are thinning.
  4. 4. the method for underwater splicing U-type groove construction subway station as claimed in claim 2 or claim 3, it is characterised in that the bottom The side of plate is equipped with the overlap for being used for adjacent U-type groove overlap joint.
  5. 5. the method for underwater splicing U-type groove construction subway station as claimed in claim 1, it is characterised in that the cement Mixing pile is co-axially mounted with I-shaped prefabricated pile.
  6. 6. the method for underwater splicing U-type groove construction subway station as claimed in claim 1, it is characterised in that the step 2) in, when to excavation of foundation pit, underwater excavation is taken in the earthwork below water level, and takes and hang bar-mat reinforcement between stake and ensure the soil body not Landslide.
  7. 7. the method for underwater splicing U-type groove construction subway station as claimed in claim 1, it is characterised in that the step 3) construct when, pine can be placed in I-shaped fender post recess and first filled, the later stage directly takes out, and after U-type groove is put into Slip casting is tamped in gap.
  8. 8. the method for underwater splicing U-type groove construction subway station as claimed in claim 1, it is characterised in that the step 4) in, termination U-type groove leaves a gap with Prefabricated end wall lap-joint, and microdilatancy waterproof mortar is injected in gap, and raising connects Water resistance at seam.
  9. 9. the method for underwater splicing U-type groove construction subway station as claimed in claim 1, it is characterised in that the step 5) in, U-type groove side sheet room is overlapped with two kinds of forms, and one kind is to stay middle hole between biside plate, and designated position is put into U-type groove Microdilatancy waterproof mortar is injected afterwards；Another kind is that biside plate is thinning in marginal position, when pouring station interior wall, is thickeied here Thickness of cast-in-place concrete.
  10. 10. the method for underwater splicing U-type groove construction subway station as claimed in claim 1, it is characterised in that the step 5) in, when U-type groove bottom plate overlaps, its overlap is stayed using flexible water bar filling sealing between adjacent U-type groove bottom plate There is gap.
CN201610817122.9A 2016-09-09 2016-09-09 A kind of method of underwater splicing U-type groove construction subway station Active CN106436749B (en)

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CN110067250A (en) * 2019-05-10 2019-07-30 中国建筑西南勘察设计研究院有限公司 Anti-floating type foundation pit supporting construction and construction method

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