CN113482021A - Half-pile supporting structure for excavating shallow foundation pit above underground structure floor and construction method - Google Patents
Half-pile supporting structure for excavating shallow foundation pit above underground structure floor and construction method Download PDFInfo
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- CN113482021A CN113482021A CN202110936015.9A CN202110936015A CN113482021A CN 113482021 A CN113482021 A CN 113482021A CN 202110936015 A CN202110936015 A CN 202110936015A CN 113482021 A CN113482021 A CN 113482021A
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- 238000010276 construction Methods 0.000 title claims abstract description 49
- 238000009412 basement excavation Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000002787 reinforcement Effects 0.000 claims description 34
- 239000002689 soil Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 5
- 238000004078 waterproofing Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000002265 prevention Effects 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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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
- E02D17/20—Securing of slopes or inclines
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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
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
-
- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Foundations (AREA)
Abstract
The invention provides a half-pile supporting structure for excavating a shallow foundation pit above an underground structure floor and a construction method, wherein the half-pile supporting structure comprises a fender pile, a half pile and an underground structure floor; the retaining wall structure required by shallow pit excavation above the underground structure floor is formed by the fender post and the half pile; the underground structure floor is arranged above the fender post and positioned on one side of the half-pile; waterproof layers are arranged above the underground structure floor, between the underground structure floor and the guard piles and between the underground structure floor and the half piles. The invention has simple structure, reasonable design and convenient use, solves the problem of excavation protection of the shallow foundation pit above the floor system of the underground structure constructed by the cover excavation method, optimizes the excavation process of the shallow foundation pit above the floor system of the underground structure, and realizes full-covering waterproofing of the lap joint of the floor system of the underground structure, thereby saving the construction period, reducing the construction cost of the foundation pit and ensuring the durability of the structure.
Description
Technical Field
The invention belongs to the technical field of foundation pit supporting, and particularly relates to a half-pile supporting structure for excavating a shallow foundation pit above an underground structure floor and a construction method.
Background
With the development of urban construction, the available space on the ground is gradually reduced and is easily restricted by surrounding buildings, roads, pipelines, underground water and other environments. At present, when foundation pits next to important pipelines and municipal roads are constructed, open excavation and cover excavation are required to be adopted due to the influence of traffic guidance and pipeline migration. The open cut method is not capable of placing a slope to excavate and construct a crown beam and a retaining wall structure because the structure is close to the existing building (structure), and the guard piles are often required to be made to the ground; the cover-digging method needs to be applied to the underground structure floor so as to ensure the space requirements of traffic diversion and pipeline migration. The common construction method of the open cut method and the cover cut method at present has more problems: the guard post is arranged on the ground in the open cut method, so that the later stage of chiseling the pipeline is not facilitated, and the larger waste is caused; the overlapping position of the underground structure floor and the building envelope in the cover excavation method cannot solve the waterproof problem due to the adoption of rigid connection, when the underground structure floor is constructed, a shallow foundation pit needs to adopt steel sheet piles or other measures, so that great waste is easily caused, and when the shallow foundation pit is excavated, more potential safety hazards are easily caused due to poor stress conditions.
Disclosure of Invention
In order to solve the technical problems, the invention provides a half-pile supporting structure for excavating a shallow foundation pit above an underground structure floor and a construction method, the structure is simple, the design is reasonable, the use is convenient, the problem of excavation protection of the shallow foundation pit above the underground structure floor constructed by a cover excavation method is solved, the excavation process of the shallow foundation pit above the underground structure floor is optimized, and the full-covering waterproof of the lap joint of the underground structure floor is realized, so that the construction period is saved, the construction cost of the foundation pit is reduced, and the structural durability is ensured.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a half-pile supporting structure for excavating a shallow foundation pit above an underground structure floor, which comprises a fender pile, a half pile and an underground structure floor; the retaining wall structure required by shallow pit excavation above the underground structure floor is formed by the fender post and the half pile; the underground structure floor is arranged above the fender post and positioned on one side of the half-pile; waterproof layers are arranged above the underground structure floor, between the underground structure floor and the guard piles and between the underground structure floor and the half piles.
Preferably, the enclosure pile comprises an enclosure pile reinforcement cage, and the enclosure pile reinforcement cage is composed of an enclosure pile main rib, an enclosure pile stirrup and an enclosure pile reinforcement stirrup; a half-pile reinforcement cage is bound above the earth facing side of the enclosure pile reinforcement cage, and the half-pile reinforcement cage is composed of half-pile main reinforcements and half-pile hooping reinforcements; and the enclosure pile reinforcement cage and the half pile reinforcement cage are respectively poured by concrete to form the enclosure pile and the half pile.
Preferably, the half-piles extend to the ground or the bottoms of the side slopes of the half-piles facing the soil.
Preferably, a pile top crown beam is arranged above the fender pile.
Preferably, a half-pile crown beam is arranged above the half-pile.
Preferably, a wall reverse construction seam is reserved below the underground structure floor.
In a second aspect, the invention also provides a construction method of the half-pile supporting structure excavated in the shallow foundation pit above the underground structural floor, which comprises the following steps:
step S1, construction site preprocessing;
step S2, constructing a fender pile drill hole and constructing a fender pile reinforcement cage;
step S3, reserving half-pile main reinforcements for the enclosure pile reinforcement cage, and constructing half-pile stirrups;
step S4, pouring fender post and half-pile concrete;
step S5, excavating a shallow foundation pit in the construction range of the underground structure floor; and constructing the underground structure floor, reserving a wall and reversely constructing a construction joint, and constructing a waterproof layer according to the construction conditions of the underground structure floor and the reserved wall.
Further, in step S3, the pile crown beam and the half pile crown beam are constructed after the half pile stirrups are constructed.
Further, in step S5, a side wall waterproof layer is constructed and the lap joint section is thrown out, then a side wall structure and an underground structure floor are constructed, and finally an underground structure floor waterproof layer is constructed and lapped with the lap joint section of the waterproof layer thrown out by the side wall after the underground structure floor is finished.
The invention has the following beneficial effects:
the half-pile supporting structure for excavating the shallow foundation pit above the underground structure floor and the construction method have the advantages of simple structure, reasonable design and convenience in use, solve the problem of excavation protection of the shallow foundation pit above the underground structure floor constructed by a cover excavation method, optimize the excavation process of the shallow foundation pit above the underground structure floor, and realize full-covering waterproofing of the lap joint of the underground structure floor, thereby saving the construction period, reducing the construction cost of the foundation pit and ensuring the durability of the structure.
According to the invention, the retaining structure is utilized to bind the half-pile reinforcing cages by the reinforcing steel bars at the soil facing side of the retaining structure, and concrete pouring is carried out simultaneously with the retaining piles, so that a retaining wall structure required by shallow foundation pit excavation above the underground structure floor is formed, and the purposes of optimizing the shallow foundation pit excavation procedure above the underground structure floor, saving the construction period and the construction cost and facilitating the structural stress are achieved; the part outside the fender pile half-pile structure is provided with a crown beam or a cover excavation reverse construction underground structure floor overlapping position leveling layer; the half piles extend to the ground or the bottoms of the side slopes of the half piles facing the soil. By improving the enclosure structure, the invention optimizes the shallow foundation pit excavation process above the underground structure floor slab of the foundation pit constructed by open excavation and cover excavation methods, thereby saving the construction period and cost, facilitating the structural stress, properly solving the problem of water prevention at the lap joint of the underground structure floor slab at the position of the cover excavation and reverse construction and achieving full-covering water prevention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present invention.
FIG. 1 is a schematic view of a half-pile supporting structure excavated in a shallow foundation pit above a floor of an underground structure in an embodiment of the invention;
FIG. 2 is a schematic view of the reinforcing bars of the fender pile structure according to the embodiment of the invention;
fig. 3 is a schematic diagram of a half-pile steel bar in the embodiment of the invention.
Description of reference numerals:
1. half-piling; 2. pile top crown beam; 3. a fender pile; 4. a waterproof layer; 5. the wall is reversely made into a construction joint; 6. an underground structure floor; 7. half-pile crown beam; 8. a main rib of the fender pile; 9. half pile main reinforcement; 10. hooping the fender pile; 11. the fender pile reinforces the stirrup; 12. and (5) semi-pile stirrups.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The embodiment provides a half-pile supporting structure for shallow foundation pit excavation above an underground structure floor, as shown in fig. 1, the half-pile supporting structure comprises a fender pile 3, a half pile 1 and an underground structure floor 6; the half piles 1 are arranged above the soil facing side of the fender post 3, and the fender post 3 and the half pile 1 form a retaining wall structure required by shallow pit excavation above the underground structure floor 6; the underground structure floor 6 is arranged above the fender post 3 and is positioned on one side of the half-pile 1; waterproof layers 4 are arranged above the underground structure floor system 6, between the underground structure floor system 6 and the guard piles 3 and between the underground structure floor system 6 and the half piles 1.
The fender pile 3 comprises a fender pile reinforcement cage which is composed of a fender pile main reinforcement 8, a fender pile stirrup 10 and a fender pile reinforcement stirrup 11, as shown in fig. 2; half pile cages are bound above the earth facing side of the fender pile cages and are composed of half pile main reinforcements 9 and half pile hoops 12, as shown in fig. 3; the enclosure pile reinforcement cage and the half pile reinforcement cage are respectively poured by concrete to form the enclosure pile 3 and the half pile 1. Whether the pile top crown beam 2 and the half pile crown beam 7 are constructed or not can be determined according to actual needs, and the pile top crown beam 2 is arranged above the fender pile 3 in the embodiment; and a half-pile crown beam 7 is arranged above the half-pile 1. And a wall reverse construction joint 5 is reserved below the underground structure floor 6. The half pile 1 extends to the ground or the bottom of a side slope of the half pile 1 facing the soil; the half pile 1 extends to the bottom of the side slope of the half pile 1 facing the soil, namely the half pile 1 (half pile crown beam 7) faces the soil to the earth surface soil body, and can be set to the top of the half pile 1 (half pile crown beam 7) to properly reduce the corresponding engineering quantity.
The embodiment also provides a construction method of the half-pile supporting structure excavated by the shallow foundation pit above the underground structural floor, which is characterized by comprising the following steps of:
step S1, construction site preprocessing;
step S2, drilling a hole in the construction fender pile 3, and constructing a steel reinforcement cage of the fender pile;
step S3, reserving a half-pile main reinforcement 9 in the enclosure pile reinforcement cage, and constructing a half-pile stirrup 12;
step S4, pouring concrete of the fender post 3 and the half pile 1;
step S5, excavating a shallow foundation pit in the construction range of the underground structure floor 6; and constructing an underground structure floor 6 and reserving a wall to reversely construct a construction joint 5, and constructing a waterproof layer 4 according to the construction conditions of the underground structure floor 6 and the reserved wall.
Further, in step S3, the pile crown beam 2 and the half pile crown beam 7 are constructed after the half pile stirrup 12 is constructed.
Further, in step S5, the side wall waterproof layer 4 is constructed and the lap joint section is thrown out, then the side wall structure and the underground structure floor 6 are constructed, and finally the waterproof layer 4 of the underground structure floor 6 is constructed and lapped with the lap joint section of the waterproof layer 4 thrown out by the side wall after the underground structure floor 6 is finished.
In the embodiment, the retaining structure is utilized to bind the half-pile reinforcing cages by the reinforcing steel bars at the soil facing side of the retaining structure, and concrete pouring is carried out simultaneously with the retaining piles, so that a retaining wall structure required by excavating the shallow foundation pit above the underground structure floor is formed, and the purposes of optimizing the excavating process of the shallow foundation pit above the underground structure floor, saving the construction period and the construction cost and facilitating the structural stress are achieved; the part outside the fender pile half-pile structure is provided with a crown beam or a cover excavation reverse construction underground structure floor overlapping position leveling layer; the half piles extend to the ground or the bottoms of the side slopes of the half piles facing the soil. The embodiment optimizes the shallow foundation pit excavation process above the underground structure floor slab of the foundation pit constructed by open excavation and cover excavation methods by improving the enclosure structure, thereby saving the construction period and cost, facilitating the structural stress, properly solving the problem of water prevention at the lap joint of the underground structure floor slab at the position of the cover excavation and the reverse construction and achieving full-covering water prevention.
According to the technical scheme, the half-pile supporting structure for excavating the shallow foundation pit above the underground structure floor and the construction method are simple in structure, reasonable in design and convenient to use, the problem of excavation protection of the shallow foundation pit above the underground structure floor constructed by the cover excavation method is solved, the excavation process of the shallow foundation pit above the underground structure floor is optimized, and the full-covering waterproof effect of the lap joint of the underground structure floor is realized, so that the construction period is shortened, the construction cost of the foundation pit is reduced, and the structural durability is ensured.
The embodiments of the present invention have been described in detail through the embodiments, but the description is only exemplary of the embodiments of the present invention and should not be construed as limiting the scope of the embodiments of the present invention. The scope of protection of the embodiments of the invention is defined by the claims. In the present invention, the technical solutions described in the embodiments of the present invention or those skilled in the art, based on the teachings of the embodiments of the present invention, design similar technical solutions to achieve the above technical effects within the spirit and the protection scope of the embodiments of the present invention, or equivalent changes and modifications made to the application scope, etc., should still fall within the protection scope covered by the patent of the embodiments of the present invention.
Claims (9)
1. A half-pile supporting structure for shallow foundation pit excavation above an underground structure floor comprises a fender post (3), a half pile (1) and an underground structure floor (6); the retaining wall structure required by shallow pit excavation above the underground structure floor (6) is formed by the fender posts (3) and the half piles (1); the underground structure floor (6) is arranged above the fender post (3) and is positioned on one side of the half pile (1); waterproof layers (4) are arranged above the underground structure floor (6), between the underground structure floor (6) and the guard piles (3) and between the underground structure floor (6) and the half piles (1).
2. The half-pile supporting structure for shallow foundation pit excavation above an underground structure floor system according to claim 1, wherein the fender pile (3) comprises a fender pile reinforcement cage which is composed of a fender pile main rib (8), a fender pile stirrup (10) and a fender pile reinforcement stirrup (11); a half-pile reinforcement cage is bound above the earth facing side of the enclosure pile reinforcement cage, and the half-pile reinforcement cage is composed of half-pile main reinforcements (9) and half-pile stirrups (12); the enclosure pile reinforcement cage and the half pile reinforcement cage are respectively poured by concrete into the enclosure pile (3) and the half pile (1).
3. The half-pile supporting structure for shallow foundation pit excavation above an underground structure floor system according to claim 1, wherein the half-pile (1) extends to the ground or the bottom of the side slope of the half-pile (1) facing the soil.
4. The half-pile supporting structure for shallow foundation pit excavation above an underground structure floor system according to claim 1, wherein a pile top crown beam (2) is arranged above the fender pile (3).
5. The half-pile supporting structure for shallow foundation pit excavation above an underground structure floor system according to claim 1, wherein a half-pile crown beam (7) is arranged above the half-pile (1).
6. The half-pile supporting structure for shallow foundation pit excavation above an underground structure floor slab as claimed in claim 1, wherein a wall reverse construction seam (5) is reserved below the underground structure floor slab (6).
7. A construction method of a half-pile supporting structure excavated by a shallow foundation pit above an underground structure floor is characterized by comprising the following steps:
step S1, construction site preprocessing;
step S2, drilling a hole in the construction fender pile (3) and constructing a steel reinforcement cage of the fender pile;
step S3, reserving a half-pile main reinforcement (9) in the enclosure pile reinforcement cage, and constructing a half-pile stirrup (12);
step S4, pouring concrete of the fender post (3) and the half pile (1);
step S5, excavating a shallow foundation pit in the construction range of the underground structure floor (6); and constructing an underground structure floor (6) and reserving a wall reverse construction seam (5), and constructing a waterproof layer (4) according to the construction conditions of the underground structure floor (6) and the reserved wall.
8. The method of constructing a half-pile supporting structure for excavation of a shallow foundation pit above an underground structure floor according to claim 7, wherein the pile-top crown beam (2) and the half-pile crown beam (7) are constructed after the half-pile stirrups (12) are constructed in step S3.
9. The construction method of the half-pile supporting structure for the shallow foundation pit excavation above the underground structure floor system as claimed in claim 7, wherein in step S5, the side wall waterproof layer (4) is constructed and the lap joint section is thrown out, then the side wall structure and the underground structure floor system (6) are constructed, and finally the waterproof layer (4) of the underground structure floor system (6) is constructed and lapped with the lap joint section of the waterproof layer (4) thrown out by the side wall after the underground structure floor system (6) is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110936015.9A CN113482021A (en) | 2021-08-19 | 2021-08-19 | Half-pile supporting structure for excavating shallow foundation pit above underground structure floor and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110936015.9A CN113482021A (en) | 2021-08-19 | 2021-08-19 | Half-pile supporting structure for excavating shallow foundation pit above underground structure floor and construction method |
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| Publication Number | Publication Date |
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| CN113482021A true CN113482021A (en) | 2021-10-08 |
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| CN202110936015.9A Pending CN113482021A (en) | 2021-08-19 | 2021-08-19 | Half-pile supporting structure for excavating shallow foundation pit above underground structure floor and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114703833A (en) * | 2022-04-27 | 2022-07-05 | 中铁三局集团有限公司 | Construction method for semi-circular piles for covering and digging station |
| CN114922224A (en) * | 2022-05-19 | 2022-08-19 | 中国建筑第八工程局有限公司 | Enclosure structure for station and construction method thereof |
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| CN111139863A (en) * | 2019-12-31 | 2020-05-12 | 上海市政工程设计研究总院（集团）有限公司 | Waterproof construction method for open cut semi-reverse construction method tunnel purlin enclosing node |
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| JPH0978614A (en) * | 1995-09-12 | 1997-03-25 | Kajima Corp | Inverted construction method combined with pre-strutting |
| CN105586985A (en) * | 2014-11-14 | 2016-05-18 | 广州地铁设计研究院有限公司 | Construction method of subway envelop enclosure structure and subway envelop enclosure structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114703833A (en) * | 2022-04-27 | 2022-07-05 | 中铁三局集团有限公司 | Construction method for semi-circular piles for covering and digging station |
| CN114922224A (en) * | 2022-05-19 | 2022-08-19 | 中国建筑第八工程局有限公司 | Enclosure structure for station and construction method thereof |
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Application publication date: 20211008 |