CN113882390A - Subway tunnel construction shaft foundation pit supporting structure without inner support and construction method - Google Patents
Subway tunnel construction shaft foundation pit supporting structure without inner support and construction method Download PDFInfo
- Publication number
- CN113882390A CN113882390A CN202111079194.5A CN202111079194A CN113882390A CN 113882390 A CN113882390 A CN 113882390A CN 202111079194 A CN202111079194 A CN 202111079194A CN 113882390 A CN113882390 A CN 113882390A
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- concrete
- foundation pit
- fender
- construction
- pile
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- 238000010276 construction Methods 0.000 title claims abstract description 72
- 239000004567 concrete Substances 0.000 claims abstract description 71
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 239000002344 surface layer Substances 0.000 claims description 9
- 238000009412 basement excavation Methods 0.000 claims description 8
- 239000010410 layer Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 7
- 239000011378 shotcrete Substances 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
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
- E02D17/02—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
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- 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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
Abstract
The invention provides a subway tunnel construction vertical shaft foundation pit supporting structure without an inner support and a construction method. The supporting structure comprises a fender post, a high-pressure jet grouting pile, a concrete purlin and a cushion layer. The high-pressure jet grouting piles, the fender piles and the concrete purlins are sequentially arranged from the outside to the inside of the foundation pit, and the high-pressure jet grouting piles and the fender piles are arranged in an occluded mode. The concrete purlin is horizontally arranged on the vertical surface of the foundation pit at certain intervals, and the four sides of the concrete purlin are respectively connected with the fender post by adopting embedded steel bars and steel bar connectors. The subway tunnel shaft foundation pit supporting structure without the inner support and the construction method effectively solve the problem of the requirement of the subway construction shaft foundation pit supporting construction space on the premise that the construction site is limited.
Description
Technical Field
The invention belongs to the technical field of foundation pit engineering, and particularly relates to a subway tunnel construction shaft foundation pit supporting structure without an inner support and a construction method
Background
The traditional deep foundation pit supporting system mainly comprises fender piles and inner supports, and the construction efficiency can be well guaranteed due to the mature construction process technology.
However, in the process of constructing the vertical shaft foundation pit in the temporary construction of the subway, the situation that the construction site and the construction space are limited inevitably occurs due to the restriction of the surrounding environment; if a traditional retaining pile and inner support supporting system is adopted, the requirement of a shaft construction space cannot be met under the existing construction site condition.
Therefore, an effective supporting system and construction method for the foundation pit are needed to solve the problem of the requirement of the construction space.
Disclosure of Invention
The invention provides a subway tunnel construction vertical shaft foundation pit supporting structure without an inner support and a construction method, and aims to solve the problem of the requirement of the construction space of the municipal subway construction vertical shaft foundation pit supporting.
The invention is realized in this way, a underground tunnel construction shaft pit supporting structure without an inner support and a construction method thereof, comprising fender piles, high-pressure jet grouting piles, net jet among fender piles, concrete waist beams and cushion layers;
the high-pressure jet grouting piles, the fender piles, the net spraying among the fender piles and the concrete waist beams are sequentially arranged from the outside of the construction shaft foundation pit to the inside of the foundation pit;
the concrete wales are vertically arranged at certain intervals on the vertical surface of the construction vertical shaft foundation pit, and two ends of the concrete wales are respectively anchored on the fender posts on two sides of the vertical shaft foundation pit;
furthermore, the construction shaft foundation pit is not provided with an inner support.
Furthermore, the concrete waist rail comprises a pile top crown beam, and a closed reinforced concrete frame structure is adopted and is also used as an inner support of the foundation pit.
Furthermore, the corner of the concrete waist rail is provided with an axillary corner, and the size of the axillary corner is not smaller than 20 cm.
Furthermore, the fender post is a cylindrical pile body and is constructed by adopting a conventional excavation method.
Furthermore, the fender pile comprises concrete and a steel reinforcement cage, and the fender pile is cast with the concrete after the steel reinforcement cage is hoisted.
Furthermore, the high-pressure jet grouting pile is of a solid structure, and the meshing width between the high-pressure jet grouting pile and the fender pile is not less than 150 mm.
Furthermore, the net spraying among the fender post piles comprises a sprayed concrete surface layer, a reinforcing mesh and transverse tie bars, and the thickness of the sprayed concrete surface layer is not smaller than 5 cm.
Furthermore, the concrete waist rail and the fender post are connected by adopting embedded steel bars, a steel bar connector and concrete waist rail connecting steel bars.
The invention also provides a construction method of the supporting structure for solving the technical problems, which comprises the following steps:
s1, fencing, leveling the field, measuring and setting off, constructing a shaft foundation pit, constructing a fender pile and a high-pressure jet grouting pile waterproof curtain, embedding embedded steel bars and a steel bar connector connected with a concrete waist beam in the fender pile, and welding the embedded steel bars and longitudinal steel bars of the fender pile;
s2, constructing a crown beam (also used as a concrete wale) along the determined position of the construction shaft foundation pit;
s3, after the crown beam (also used as a concrete waist beam) is finished, excavating the earthwork of the foundation pit of the construction vertical shaft, when excavating the earthwork of the vertical shaft, adopting sectional excavation, excavating from top to bottom, and simultaneously carrying out the net spraying between the fender post piles and the construction of the concrete waist beam, wherein the concrete waist beam is used as a concrete inner support and is supported along with excavation;
s4, when the construction is carried out on the concrete waist rail, positioning according to embedded steel bars in the fender post, chiseling a concrete protective layer on the surface layer of the fender post, then connecting the embedded steel bars with connecting steel bars in the concrete waist rail by using a steel bar connector, and pouring concrete after the binding of the steel bars of the concrete waist rail and the installation of the template are finished;
and S5, excavating a bottom penetrating section foundation pit to the bottom of the pit, pouring a pit bottom cushion layer, and using the cushion layer as a foundation pit bottom support to complete the construction of the foundation pit supporting structure of the construction shaft.
Compared with the prior art, the invention has the beneficial effects that:
the subway tunnel construction vertical shaft foundation pit supporting structure without the inner support and the construction method thereof provided by the invention have the advantages that the conventional concrete or steel support is not required, and the problem of the requirement of the municipal subway construction vertical shaft foundation pit supporting construction space is effectively solved on the premise that the construction site is limited.
Drawings
Fig. 1 is a schematic view of a plane layout of a foundation pit support of a subway tunnel construction shaft without an inner support according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of the support structure of fig. 1 at a pit of a construction shaft;
fig. 3 is a schematic plane view of the connection between the concrete wale and the fender pile of the foundation pit support of the construction shaft of the support structure shown in fig. 1;
fig. 4 is a schematic sectional view of the connection between the concrete wale and the fender pile of the foundation pit support of the construction shaft of the support structure shown in fig. 1;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and 2, a preferred embodiment of the invention is shown, in which a subway tunnel construction shaft foundation pit supporting structure without an inner support includes a fender post 3, a high-pressure jet grouting pile 2, a fender post inter-pile net-jet grouting 5, a concrete waist rail 1, and a cushion 4.
The high-pressure jet grouting pile 2, the fender pile 3, the inter-pile net-jet grouting pile 5 and the concrete waist beam 1 are sequentially arranged from the outside of the construction shaft foundation pit 100 to the inside of the construction shaft foundation pit 100.
Referring to fig. 1 and 2, the enclosure wall includes a plurality of vertical enclosure piles 3, the enclosure wall is disposed at four sides of the construction shaft pit 100, and the uppermost portions of the enclosure piles 3 are integrally connected by concrete wales 1 (top crown beams). The high-pressure jet grouting pile 2 is positioned outside the fender pile 3 and is meshed with the fender pile 3.
Referring to fig. 3 and fig. 4, a plane and a cross-sectional structure of the connection between the concrete wale 1 and the fender pile 3 are respectively shown, and the fender pile 3 needs to embed a reinforcing bar 33-grade reinforcing bar connector 34 at the connection position with the concrete wale 1.
Referring to fig. 3 and 4, the longitudinal steel bars 32 of the fender pile 3 are anchored into the concrete wale 1 (top crown beam), a plurality of concrete wales 1 are arranged at certain intervals in the vertical direction of the construction shaft foundation pit 100 and also serve as inner supports, and the connecting steel bars 6 on one side of the concrete wale 1 are respectively connected with the embedded steel bars 33 in the vertical fender pile 3 by using the embedded connectors 34. In this embodiment, the fender pile 3 is of a reinforced concrete structure, and the concrete wale 1 is of a reinforced concrete structure.
Specifically, the construction shaft pit 100 of the present embodiment does not have an inner support.
The concrete waist rail 1 comprises a pile top crown beam, adopts a closed reinforced concrete frame structure and is also used as an inner support of a foundation pit.
The corner of the concrete waist rail 1 is provided with an axillary corner, and the size of the axillary corner is not less than 20 cm.
The vertical fender pile 3 is a cylindrical pile body.
The high-pressure jet grouting pile 2 is of a solid structure, and the meshing width between the high-pressure jet grouting pile 2 and the fender pile 3 is not less than 150 mm.
The net spraying among the piles of the fender post comprises a sprayed concrete surface layer, a reinforcing mesh and transverse tie bars, and the thickness of the sprayed concrete surface layer is not smaller than 5 cm.
The embedded steel bars are made of first-grade steel, and the diameter of the embedded steel bars 33 is not more than 25 mm.
The embodiment also provides a construction method of the supporting structure, which comprises the following steps:
s1, fencing, leveling the field, measuring and setting off, constructing a vertical shaft foundation pit 100 and positioning, constructing a fender pile 3 and a high-pressure jet grouting pile 2 waterproof curtain, embedding embedded steel bars 31 and a steel bar connector 32 connected with a concrete waist beam in the fender pile 3, and welding the embedded steel bars 31 and longitudinal steel bars 32 of the fender pile;
s2, constructing the concrete wale 1 (crown beam) along the determined position of the construction shaft foundation pit 100;
s3, after the concrete waist beam 1 (crown beam) is finished, excavating the earthwork of the construction vertical shaft foundation pit 100, when excavating the earthwork of the vertical shaft, adopting sectional excavation, excavating from top to bottom, and simultaneously carrying out the construction of the guard post inter-pile net spraying 5 and the concrete waist beam 1, wherein the concrete waist beam 1 is used as a concrete inner support and is supported along with excavation;
s4, when the construction is carried out on the concrete wale 1, positioning according to the embedded steel bars 31 in the fender post 2, chiseling a concrete protective layer on the surface layer of the fender post, then connecting the embedded steel bars 31 with the connecting steel bars 6 in the concrete wale 1 by using the steel bar connector 32, and pouring concrete after the binding of the concrete wale steel bars 11 and the installation of the template are finished;
and S5, excavating the foundation pit of the lower penetrating section to the bottom of the pit, pouring a pit bottom cushion layer 4, and using the cushion layer 4 as a foundation pit bottom support to complete the construction of the supporting structure of the vertical shaft foundation pit 100.
In conclusion, the supporting structure applied to the construction shaft foundation pit and the construction method thereof provided by the embodiment do not need to adopt conventional concrete or steel supports, and effectively solve the problem of the requirement of the supporting construction space of the municipal subway construction shaft foundation pit on the premise of limited construction site.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A subway tunnel construction shaft foundation pit supporting structure without an inner support is characterized by comprising fender posts, high-pressure jet grouting piles, inter-pile net jet grouting, concrete purlins and a cushion layer;
the high-pressure jet grouting piles, the fender piles, the net spraying among the fender piles and the concrete waist beams are sequentially arranged from the outside of the construction shaft foundation pit to the inside of the foundation pit;
the concrete wales are arranged on the vertical surface of the construction vertical shaft foundation pit at certain intervals, and two ends of the concrete wales are respectively anchored on the fender posts on two sides of the vertical shaft foundation pit.
2. The support structure of claim 1, wherein the fender post is a cylindrical post body formed by excavation.
3. The support structure of claim 2, wherein the fender post comprises concrete and a reinforcement cage, and the fender post is cast with the concrete after hoisting of the reinforcement cage is completed.
4. The support structure of claim 2, wherein the high-pressure jet grouting pile is a solid structure, and the engaging width between the high-pressure jet grouting pile and the fender pile is not less than 150 mm.
5. The support structure of claim 3, wherein the fender post inter-pile mesh is composed of a sprayed concrete surface layer, a reinforcing mesh and transverse tie bars, and the thickness of the sprayed concrete surface layer is not less than 5 cm.
The support structure of claim 1, wherein the concrete wale comprises a pile top crown beam, and adopts a closed reinforced concrete frame structure, which also serves as an inner support of the foundation pit.
6. The supporting structure of claim 1, wherein the concrete wale (without the crown beam) is connected with the fender pile by using embedded steel bars, steel bar connectors and concrete wale connecting steel bars.
7. A method of constructing a supporting structure as claimed in claim 4, including the steps of:
s1, fencing, leveling the field, measuring and setting off, constructing a shaft foundation pit, constructing a fender pile and a high-pressure jet grouting pile waterproof curtain, embedding embedded steel bars and a steel bar connector connected with a concrete waist beam in the fender pile, and welding the embedded steel bars and longitudinal steel bars of the fender pile;
s2, constructing a crown beam (also used as a concrete wale) along the determined position of the construction shaft foundation pit;
s3, after the crown beam (also used as a concrete waist beam) is finished, excavating the earthwork of the foundation pit of the construction vertical shaft, when excavating the earthwork of the vertical shaft, adopting sectional excavation, excavating from top to bottom, and simultaneously carrying out the net spraying between the fender post piles and the construction of the concrete waist beam, wherein the concrete waist beam is used as a concrete inner support and is supported along with excavation;
s4, when the construction is carried out on the concrete waist rail, positioning according to embedded steel bars in the fender post, chiseling a concrete protective layer on the surface layer of the fender post, then connecting the embedded steel bars with connecting steel bars in the concrete waist rail by using a steel bar connector, and pouring concrete after the binding of the steel bars of the concrete waist rail and the installation of the template are finished;
and S5, excavating a bottom penetrating section foundation pit to the bottom of the pit, pouring a pit bottom cushion layer, and using the cushion layer as a foundation pit bottom support to complete the construction of the foundation pit supporting structure of the construction shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111079194.5A CN113882390A (en) | 2021-09-15 | 2021-09-15 | Subway tunnel construction shaft foundation pit supporting structure without inner support and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111079194.5A CN113882390A (en) | 2021-09-15 | 2021-09-15 | Subway tunnel construction shaft foundation pit supporting structure without inner support and construction method |
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| CN113882390A true CN113882390A (en) | 2022-01-04 |
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| CN202111079194.5A Pending CN113882390A (en) | 2021-09-15 | 2021-09-15 | Subway tunnel construction shaft foundation pit supporting structure without inner support and construction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115012423A (en) * | 2022-06-07 | 2022-09-06 | 广州地铁设计研究院股份有限公司 | Waist beam pouring construction method for foundation pit support and waist beam structure |
| CN115110519A (en) * | 2022-06-30 | 2022-09-27 | 广州地铁设计研究院股份有限公司 | Connecting joint of underground continuous wall, tire membrane waist beam and prefabricated support and construction method |
| CN115492126A (en) * | 2022-10-26 | 2022-12-20 | 中国电建集团西北勘测设计研究院有限公司 | Steel sheet pile and vertical shaft combined foundation pit supporting structure and method |
| CN116289992A (en) * | 2023-04-04 | 2023-06-23 | 中国十九冶集团有限公司 | Foundation pit supporting construction method suitable for powdery clay geological conditions |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115012423A (en) * | 2022-06-07 | 2022-09-06 | 广州地铁设计研究院股份有限公司 | Waist beam pouring construction method for foundation pit support and waist beam structure |
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| CN115110519A (en) * | 2022-06-30 | 2022-09-27 | 广州地铁设计研究院股份有限公司 | Connecting joint of underground continuous wall, tire membrane waist beam and prefabricated support and construction method |
| CN115110519B (en) * | 2022-06-30 | 2023-10-10 | 广州地铁设计研究院股份有限公司 | Connecting node for underground diaphragm wall, tire membrane waist beam and prefabricated support and construction method |
| CN115492126A (en) * | 2022-10-26 | 2022-12-20 | 中国电建集团西北勘测设计研究院有限公司 | Steel sheet pile and vertical shaft combined foundation pit supporting structure and method |
| CN116289992A (en) * | 2023-04-04 | 2023-06-23 | 中国十九冶集团有限公司 | Foundation pit supporting construction method suitable for powdery clay geological conditions |
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