WO2023077867A1 - Structure de support et son procédé de construction - Google Patents

Structure de support et son procédé de construction Download PDF

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Publication number
WO2023077867A1
WO2023077867A1 PCT/CN2022/106493 CN2022106493W WO2023077867A1 WO 2023077867 A1 WO2023077867 A1 WO 2023077867A1 CN 2022106493 W CN2022106493 W CN 2022106493W WO 2023077867 A1 WO2023077867 A1 WO 2023077867A1
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WO
WIPO (PCT)
Prior art keywords
soil
base
reinforcement
support
facing surface
Prior art date
Application number
PCT/CN2022/106493
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English (en)
Chinese (zh)
Inventor
陈云峰
高战祥
许朝敬
赵海龙
汤润江
舒永峥
潘光昱
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中建科工集团有限公司
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Publication date
Application filed by 中建科工集团有限公司 filed Critical 中建科工集团有限公司
Publication of WO2023077867A1 publication Critical patent/WO2023077867A1/fr

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/02—Foundation pits
    • E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same

Definitions

  • the invention relates to the technical field of support, in particular to a support structure and a construction method thereof.
  • the commonly used construction method for support piles is bored piles. After the pouring is completed, the support piles are subjected to a large lateral pressure of the soil, which causes a large bending moment at the bottom of the support piles and increases the safety risk of the support piles. To ensure safety, it is necessary to have high-strength steel bars to support the supporting piles, and the cost is relatively high. In addition, during construction, the bored piles are greatly affected by the site and have high requirements for the site. The drilling rig needs to keep a certain safe distance from the surrounding buildings and the empty surface of the slope, and ensure the foundation bearing capacity and stability of the support pile construction surface. The stability and rigidity meet the requirements, and the construction safety risk of pile connection technology is high, and the construction period is long.
  • the present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention proposes a support structure, which can reduce the bending moment on the bottom of the support structure, has high safety during construction, and has a fast construction period.
  • the present invention also proposes a construction method of the above-mentioned supporting structure.
  • the support structure according to the embodiment of the first aspect of the present invention is used for foundation pit support, including:
  • the retaining wall includes a base and a retaining portion, the retaining portion is connected to the upper surface of the base, the base is connected to the upper end of the support pile, the retaining portion has a second earth-facing surface, The second soil-facing surface extends along the axial direction of the support pile, the upper surface of the base includes a first soil-facing surface, and the center point of the first soil-facing surface is located along the axis of the support pile. The second soil-facing surface faces one side of the support pile.
  • the second soil-facing surface of the retaining portion and the first soil-facing surface of the base can resist the backfill soil to prevent backfill soil loss.
  • the backfill soil will exert a lateral thrust on the second soil-facing surface, causing the support structure to generate a negative bending moment at the bottom of the support pile (the direction of the bending moment is determined by the orientation of the second soil-facing surface, which is only for the convenience of description , it is not necessarily negative in practice, it may also be positive), the vertical downward pressure on the first soil-facing surface makes the bottom of the support pile produce a positive bending moment to offset the negative bending moment produced and improve
  • This embodiment can reduce the strength of the steel bar on the premise of improving the safety, so as to reduce the cost.
  • an anchor cable is also included, one end of the anchor cable is connected to the retaining wall, and the other end is connected to the foundation on the side facing the second soil-facing surface;
  • one end of the anchor cable is connected to the upper end of the support pile, and the other end is connected to the foundation on the side facing the second soil-facing surface.
  • the retaining wall further includes a reinforcement, one end of the reinforcement is connected to the second soil-facing surface, and the other end is connected to the second soil-facing surface.
  • the present invention also includes a pile front baffle, the pile front baffle is connected to the side of the support pile, the pile front baffle has a third soil-facing surface, and the third soil-facing surface The face faces the same direction as the second soil-facing face.
  • the support structure construction method according to the second aspect embodiment of the present invention is used to construct the support structure described in the above embodiment, comprising the following steps:
  • the retaining wall is formed by pouring on the upper ends of the support piles.
  • the construction method of the supporting structure according to the embodiment of the present invention has at least the following beneficial effects: the construction period is short and the safety is high.
  • the step of pouring the support piles includes:
  • Concrete is poured into the hole, and the upper end of part of the support pile reinforcement is located outside the concrete, and the support pile is formed after the concrete is solidified.
  • the step of pouring the retaining wall includes:
  • a base mold is set on the upper end of the support pile
  • Concrete is poured into the soil retaining part mold, and the soil retaining part is formed after the concrete solidifies.
  • the step of pouring the retaining wall includes:
  • a base mold is set on the upper end of the support pile
  • a mold for the soil retaining part is formed around the reinforcement of the soil retaining part with a formwork, and the base mold communicates with the soil retaining part mold;
  • Concrete is poured into the base mold and the soil retaining part mold, and the retaining wall is formed after the concrete solidifies.
  • pouring the retaining wall also includes the following steps:
  • a reinforcing steel bar is arranged between the base steel bar and the soil retaining part steel bar, and a reinforcement mold is set around the reinforcing bar, which is used for pouring to form a reinforcement, and the reinforcement is connected to the base and the Between the retaining parts.
  • the following steps are further included: fixing one end of the anchor cable to the retaining wall, and fixing the other end to the side of the retaining wall along the second earth-facing surface. on the foundation;
  • one end of the anchor cable is fixed to the upper end of the support pile, and the other end is fixed to the foundation on the side of the support pile along the second soil-facing surface.
  • Fig. 1 is a schematic cross-sectional view of a support structure of an embodiment of the first aspect of the present invention
  • Fig. 2 is a top view of the support structure of the embodiment of the first aspect of the present invention in Fig. 1;
  • Fig. 3 is the flow chart of the construction method of the support structure of the second aspect embodiment of the present invention.
  • Fig. 4 is the method flowchart of pouring support pile among Fig. 3;
  • Fig. 5 is the method flowchart of pouring retaining wall among Fig. 3;
  • FIG. 6 is a flow chart of another method for pouring the retaining wall in FIG. 3 .
  • the front baffle plate 300 of the pile, and the third earth-facing surface 310 are The front baffle plate 300 of the pile, and the third earth-facing surface 310 .
  • orientation descriptions such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
  • Fig. 1 is a schematic cross-sectional view of the support structure of the embodiment of the first aspect of the present invention
  • Fig. 2 is a top view of the support structure of the embodiment of the first aspect of the present invention in Fig.
  • the structure is used for foundation pit support, including: support piles 100 and retaining walls 200 .
  • the support pile 100 can be located in the foundation (undisturbed soil of the foundation pit).
  • the retaining wall 200 includes a base 210 and a retaining portion 220, the retaining portion 220 is connected to the upper surface of the base 210, the base 210 is connected to the upper end of the support pile 100, the retaining portion 220 has a second earth-facing surface 221, the second The soil-facing surface 221 extends along the axial direction of the support pile 100.
  • the upper surface of the base 210 includes a first soil-facing surface 211. On the side facing the soil surface 221 , the second soil-facing surface 221 can receive the lateral pressure of the backfill soil, and the first soil-facing surface 211 can receive the vertical pressure of the backfill soil.
  • the support structure of this embodiment is fixed on the foundation, and the support piles 100 are located inside the foundation, and the support piles 100 can be single row, double row or multiple rows, and usually each row will There are a plurality of support piles 100 .
  • the retaining wall 200 is located outside the foundation. When the foundation pit is backfilled with soil, the backfill soil (soil backfilled into the foundation pit) squeezes the second soil-facing surface 221 of the retaining portion 220 and the first soil-facing surface of the base 210.
  • the surface 211 that is, the second soil-facing surface 221 and the upper surface of the base 210 can bear against the backfill to prevent the backfill from being lost.
  • the backfill soil will exert a lateral thrust on the second soil-facing surface 221, so that the support structure will generate a negative bending moment at the bottom of the support pile 100 (the direction of the bending moment is determined by the orientation of the second soil-facing surface 221, here only For the convenience of description, it is not necessarily negative in practice, it may be positive), the vertical downward pressure on the first soil-facing surface 211, and because the center point 2111 of the first soil-facing surface 211 is located at the center point 2111 of the support pile 100
  • the axis 110 is vertically along the side facing the second soil-facing surface 221 , as shown in FIG. 2 .
  • the force received by the first soil-facing surface 211 (actually, the force received by the first soil-facing surface 211 is a uniform force, in order to clearly express the force point and direction of the moment, this application simplifies the uniform force as the first soil-facing surface
  • the concentrated force received by the central point 2111 of the surface 211) will generate a positive bending moment at the bottom of the support pile 100, to offset the negative bending moment produced by the force received by part of the second soil-facing surface 221, and improve the support structure. safety.
  • the support structure of this embodiment can reduce the strength requirement of the steel bar on the premise of ensuring safety, so as to reduce the cost.
  • the support structure also includes an anchor cable (not shown in the figure), one end of the anchor cable is connected to the retaining wall 200, and the other end is connected to the retaining wall 200 along the second earth-facing surface 221 toward a side foundation.
  • one end of the anchor cable is connected to the upper end of the support pile 100 , and the other end is connected to the foundation of the support pile 100 facing one side along the second soil-facing surface 221 .
  • one end of the anchor cable is connected to the upper end of the retaining wall 200 and the support pile 100 , and the other end is connected to the foundation of the support pile 100 facing one side along the second soil-facing surface 221 .
  • one end of the anchor cable is connected to the retaining wall 200, and the other end is connected to the foundation.
  • the anchor cable will provide an The tensile force balances the force on the soil retaining portion 220, prevents the position of the support structure from changing, and improves the safety of the support structure.
  • one end of the anchor cable is connected to the upper end of the support pile 100 and the other end is connected to the foundation where the support pile 100 faces one side along the second soil-facing surface 221 , and will not be repeated here.
  • one end of part of the anchor cables can also be connected to the retaining wall 200, and the other end can be connected to the retaining wall 200 along the second soil-facing surface 221 toward foundation on one side.
  • One end of part of the anchor cable is connected to the upper end of the support pile 100 , and the other end is connected to the foundation of the support pile 100 facing one side along the second soil-facing surface 221 .
  • One end of part of the anchor cable is connected to the upper end of the retaining wall 200 and the support pile 100 , and the other end is connected to the foundation of the support pile 100 facing one side along the second soil facing surface 221 .
  • the retaining wall 200 further includes a reinforcement 230 , one end of the reinforcement 230 is connected to the first soil-facing surface 211 , and the other end is connected to the second soil-facing surface 221 .
  • a reinforcing member 230 is added between the soil retaining portion 220 and the base 210.
  • the reinforcing member 230 can be a buttress structure, a haunch structure, and a tie rod, etc.
  • the reinforcing member 230 can improve the connection strength between the soil retaining portion 220 and the base 210, ensuring The retaining portion 220 does not break at the connection with the base 210, so as to improve the safety of the supporting structure.
  • the cross section of the soil retaining portion 220 can be gradually increased from top to bottom, so that the connection between the soil retaining portion 220 and the base 210 has greater strength.
  • the support structure further includes a pile front baffle 300, the pile front baffle 300 is connected to the side of the support pile 100, the pile front baffle 300 has a third soil-facing surface 310, the third The orientation of the soil-facing surface 310 is the same as that of the second soil-facing surface 221 .
  • the pile front baffle 300 is located on the side of the support pile 100, and is located on the lower surface of the base 210 to support the base 210, and the third soil-facing surface 310 and the second soil-facing surface 221 are both facing the side of the backfill.
  • the third soil-facing surface 310 of the pile front baffle 300 can block the backfill soil or the undisturbed soil of the foundation from moving between the support piles 100 to prevent water and soil loss.
  • the third soil-facing surface 310 of the pile front baffle 300 can be connected to the side of the support pile 100 , or the surface away from the third soil-facing surface 310 can be connected to the support pile 100 .
  • Fig. 3 is a flow chart of the construction method of the support structure of the second aspect embodiment of the present invention, the construction method of the support structure of the second aspect embodiment of the present invention is used to build the support structure of the first aspect embodiment, Including the following steps:
  • a hole is drilled on the foundation by a drilling rig, and the diameter of the hole is determined according to the force that the support pile 100 needs to bear. After the hole is drilled, pour concrete into the hole. When multiple holes need to be drilled, when drilling the back hole, the previously drilled holes can be poured to speed up the construction. It should be noted that a certain distance should be kept between the pouring hole and the hole being drilled to ensure the safety of the construction. After all the supporting piles 100 are solidified and dried, the upper ends of the supporting piles 100 are poured to form a retaining wall 200, and the height of the retaining wall 200 is determined according to actual requirements.
  • the support structure construction method of this embodiment is compared with the support structure of the traditional support, and the upper part of the support pile 100 in the traditional technology is set as the retaining wall 200, that is, the support pile 100 inside the foundation,
  • the exterior of the foundation is a retaining wall 200 .
  • the drilling rig directly drills on the undisturbed soil without considering the distance between the drilling rig and the backfill slope, and the undisturbed soil has a high density, which has a high bearing capacity for the drilling rig and safer construction.
  • pile connection use high-altitude support to customize cylindrical formwork
  • the steel cage and formwork are high and not conducive to fixing, it is difficult to guarantee construction accuracy, high safety risks, difficult construction, and long construction period), Reduce construction risk, construction difficulty and construction period.
  • FIG. 4 is a flow chart of a method for pouring support piles in FIG. 3 .
  • the step of pouring support piles 100 includes:
  • FIG. 5 is a flowchart of a method for pouring a retaining wall in FIG. 3.
  • the step of pouring a retaining wall 200 includes:
  • a base 210 is provided on the upper end of the support pile 100 to shape the base 210 .
  • the steel bars of the support piles reserved outside the support pile 100 are located in the base mold, and the base steel bars are arranged in the base mold, and the base steel bars and the steel bars of the support piles are connected together by means of welding, etc.
  • the connecting reinforcement should be set on the base reinforcement.
  • the connecting steel bars are connected to the base steel bars. When concrete is poured into the base mold to form the base 210, the connecting steel bars will be partially located on the upper surface of the base 210 for subsequent connection with the reinforcing bars of the retaining portion.
  • the soil retaining reinforcement is provided on the upper surface of the base 210 near the support pile 100, and the soil retention reinforcement is connected to the connection reinforcement.
  • formwork is used to enclose the reinforcing bars of the soil retaining part to form the mold of the soil retaining part.
  • concrete is poured into the mold of the soil retaining part, and the mold of the soil retaining part is removed after the concrete dries to form the soil retaining part 220 .
  • the soil retaining mold can be made of templates, aluminum plates, steel plates and other materials.
  • the part of the upper surface of the base 210 that is not connected to the soil retaining portion 220 is the first soil facing surface 211
  • the side of the soil retaining portion 220 close to the first soil facing surface 211 is the second soil facing surface 221
  • the first soil facing surface 221 The soil-facing surface 211 intersects with the second soil-facing surface 221 to form an included angle.
  • the base reinforcement is set after the support pile 100 is poured, which cannot be interpreted as the base reinforcement is erected after the support pile 100 is poured. It can be set according to actual construction conditions, such as:
  • the overall size of the support structure to be constructed is small. During the construction process, if the outline of the support structure can be ensured to remain unchanged, the base reinforcement can be built in advance. After all the support piles 100 are poured, the The base steel bars that have been built are placed in the base mold and connected with the support pile steel bars to improve construction efficiency.
  • the overall size of the support structure to be constructed is relatively large. During the construction process, if the outline of the support structure can be ensured to remain unchanged, you can choose to use the splicing method to divide the base steel bars into multiple parts for construction. After the pouring of the pile 100 is completed, each part of the base reinforcement is placed in the mold and spliced with each other to form a completed base reinforcement, which is connected with the support pile reinforcement to improve construction efficiency.
  • FIG. 6 is a flowchart of another method for pouring the retaining wall in FIG. 3 .
  • the base 210 and the retaining portion 220 are poured at the same time.
  • the step of pouring the retaining wall 200 includes:
  • the base mold is set on the upper end of the support pile 100;
  • pouring the retaining wall 200 further includes the following steps:
  • the construction method of the supporting structure further includes the following steps: one end of the anchor cable is fixed to the retaining wall 200 , and the other end is fixed to the foundation of the retaining wall 200 on one side along the second soil-facing surface 221 .
  • one end of the anchor cable is fixed on the upper end of the support pile 100, and the other end is fixed on the foundation of the support pile 100 on the side facing the second soil-facing surface 221, or one end of the anchor cable is fixed on the retaining pile 100.
  • the upper end of the wall 200 and the support pile 100 and the other end are fixed on the foundation of the retaining wall 200 facing one side along the second soil facing surface 221 . In order to improve the overall resistance of the support structure to lateral pressure.
  • the supporting structure construction method also includes the following steps;
  • the pile front baffle 300 is formed by pouring in the groove.
  • a groove is dug on the foundation, and the pile front baffle reinforcement is placed in the groove, and concrete is poured into the groove to form the pile front baffle 300 .
  • S100 and S500 are not limited in sequence, that is, you can dig a groove on the foundation first and then drill a hole, or you can drill a hole in the foundation first and then dig a groove.
  • S200 and S600 are not limited in sequence. They can be poured first to form the pile front baffle 300 and then poured to form the support pile 100, or they can be poured first to form the support pile 100 and then poured to form the pile front 300. It is also possible to support The pile 100 and the pile front baffle 300 are poured at the same time to improve construction efficiency.
  • the holes can be connected with the grooves, and the steel bars of the supporting piles can be connected with the reinforcing bars of the pile front baffles. Therefore, when the concrete is poured, the pile front baffle 300 and the supporting piles 100 form an integrated structure. Improves overall strength.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (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)
  • Bulkheads Adapted To Foundation Construction (AREA)

Abstract

La présente invention concerne une structure de support et son procédé de construction. La structure de support est utilisée pour supporter une fosse de fondation, et comprend : un pieu de support et une paroi de retenue de sol. Le pieu de support peut être disposé dans une fondation ; et la paroi de retenue de sol comprend une base et une partie de retenue de sol, la partie de retenue de sol est reliée à une surface supérieure de la base, la base est reliée à une extrémité supérieure du pieu de support, la partie de retenue de sol est pourvue d'une seconde face orientée vers le sol, la seconde face orientée vers le sol s'étend dans une direction d'axe du pieu de support, la surface supérieure de la base comprend une première face orientée vers le sol, et un point central de la première face orientée vers le sol est situé sur un côté d'un axe du pieu de support faisant face au pieu de support le long de la seconde face orientée vers le sol. Après le remblayage du sol de la fosse de fondation, la seconde face orientée vers le sol et la première face orientée vers le sol sont soumises à une pression de sol de remblayage, et un moment de flexion opposé est généré au fond du pieu de support de manière à décaler la pression, de telle sorte que la sécurité de la structure de support est améliorée ; et en outre, l'exigence de résistance des barres d'acier peut être réduite, de manière à réduire le coût.
PCT/CN2022/106493 2021-11-05 2022-07-19 Structure de support et son procédé de construction WO2023077867A1 (fr)

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CN202111303962.0A CN113981984A (zh) 2021-11-05 2021-11-05 支护结构及其施工方法
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CN113981984A (zh) * 2021-11-05 2022-01-28 中建科工集团有限公司 支护结构及其施工方法

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CN113981984A (zh) * 2021-11-05 2022-01-28 中建科工集团有限公司 支护结构及其施工方法

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CN207512753U (zh) * 2017-11-08 2018-06-19 辽宁大学 一种悬臂挡墙与桩锚支护相结合的基坑支护结构
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US20070092343A1 (en) * 2005-10-19 2007-04-26 Cargill Kevin W Micropile Retaining Wall
JP2007154413A (ja) * 2005-11-30 2007-06-21 Marui Kensetsu:Kk 親杭式土留アンカー式擁壁及びその構築方法
CN105735345A (zh) * 2016-04-01 2016-07-06 自贡市城市规划设计研究院有限责任公司 一种复合式支挡结构及其采用该支挡结构的施工方法
CN109403371A (zh) * 2018-10-29 2019-03-01 中铁四院集团西南勘察设计有限公司 一种陡坡路堤支挡结构及施工方法
CN113152518A (zh) * 2021-05-13 2021-07-23 中铁三局集团有限公司 富水地层基坑桩板墙桩间砂石反滤防渗漏结构及施工方法
CN113981984A (zh) * 2021-11-05 2022-01-28 中建科工集团有限公司 支护结构及其施工方法

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