CN212506313U - Combined foundation pit supporting structure - Google Patents

Combined foundation pit supporting structure Download PDF

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Publication number
CN212506313U
CN212506313U CN202021922327.1U CN202021922327U CN212506313U CN 212506313 U CN212506313 U CN 212506313U CN 202021922327 U CN202021922327 U CN 202021922327U CN 212506313 U CN212506313 U CN 212506313U
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CN
China
Prior art keywords
foundation pit
cement
mixing pile
rib
soil mixing
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Expired - Fee Related
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CN202021922327.1U
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Chinese (zh)
Inventor
马斌
罗如平
万宗江
朱碧堂
陈晓飞
丁志文
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East China Jiaotong University
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East China Jiaotong University
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Priority to CN202021922327.1U priority Critical patent/CN212506313U/en
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Publication of CN212506313U publication Critical patent/CN212506313U/en
Expired - Fee Related legal-status Critical Current
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Abstract

The utility model discloses a modular underground structure belongs to civil engineering technical field. The foundation pit supporting structure comprises a cement mixing pile and is arranged on the outer side of an excavation surface of a foundation pit; the reinforcement body is arranged between the excavation surface of the foundation pit and the cement-soil mixing pile, one end of the reinforcement body is anchored in the cement-soil mixing pile, and the other end of the reinforcement body is anchored on the excavation surface of the foundation pit; the reinforcing mesh is arranged on the excavation surface of the foundation pit, and the end part of the rib body, which is positioned on the excavation surface of the foundation pit, is connected with the reinforcing mesh through a reinforcing rib; and the concrete layer is positioned on the surface of the steel bar net piece. The utility model discloses a supporting construction of foundation ditch when water proof, waterproof, can the strength characteristic of full play cement soil mixing pile stagnant water curtain, its anchor effect is more reliable. More importantly, due to the good anchoring effect of the cement-soil mixing pile, the length of the rib body material can be greatly reduced, and the rib body material is limited from the excavation surface of the foundation pit to the cement-soil mixing pile.

Description

Combined foundation pit supporting structure
Technical Field
The utility model relates to a civil engineering technical field, concretely relates to modular underground structure.
Background
In the design of a foundation pit support of a water-rich stratum, a cement-soil mixing pile is usually used as a waterproof curtain to isolate the communication of underground water inside and outside a foundation pit so as to facilitate the excavation construction of the foundation pit. In fact, besides the water-resisting function, the cement-soil mixing pile has excellent mechanical properties, and especially in sandy soil stratum, the unconfined compressive strength of the cement-soil mixing pile is generally close to 4MPa and far exceeds that of natural soil. Therefore, in the current foundation pit support design, the high bearing characteristics of the cement-soil mixing piles are not fully exerted only by utilizing the water-resisting performance of the cement-soil mixing piles, and the waste of materials or structures is caused, which is a pity.
Chinese patent document CN206599785U discloses a row pile anchored cement-soil pile continuous wall supporting structure, wherein the excavation surface of the foundation pit is supported by vertical row piles and a concrete surface layer, and anchored to the outside cement-soil mixing pile through a full-length bonding anchor rod, thereby forming an integrally stressed foundation pit excavation supporting structure. However, in the method, a corresponding pile arrangement structure needs to be arranged on the excavation surface, and the cement soil mixing piles need to be additionally and independently arranged, so that the strength characteristic of the waterproof curtain is not fully utilized, and the construction cost is still high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the problem among the prior art, provide a foundation ditch supporting construction and construction method that can make full use of among the rich water stratum cement soil stirring stake stagnant water curtain self intensity.
The utility model provides a modular underground structure, include:
the cement soil mixing pile is arranged on the outer side of the excavation surface of the foundation pit;
the number of the rib bodies is multiple, the rib bodies are uniformly arranged between the excavation surface of the foundation pit and the cement soil mixing piles in multiple rows, one end of each rib body is anchored in the cement soil mixing pile, and the other end of each rib body is anchored on the excavation surface of the foundation pit;
the reinforcing mesh is arranged on the excavation surface of the foundation pit, and the end part of the rib body, which is positioned on the excavation surface of the foundation pit, is connected with the reinforcing mesh through a reinforcing rib;
and the concrete layer is positioned on the surface of the steel mesh.
Preferably, the end part of the rib body is fixedly connected with the reinforcing rib and the reinforcing mesh in a bolt connection or welding mode.
Preferably, the rib body is obliquely arranged between the cement soil mixing pile and the foundation pit excavation surface, the inclination angle is 5-30 degrees, the high end of the rib body is located on the foundation pit excavation surface, and the low end of the rib body is located on the cement soil mixing pile.
Preferably, the tendon is a tensile tendon or a non-tensile tendon.
Preferably, the thickness of the single cement mixing pile is not less than 1 m.
Preferably, when the excavation depth is more than 8 meters, arranging a plurality of cement soil mixing piles; when the rib body is a tensile rib body, the rib body is anchored in the cement mixing pile at the outermost side; when the rib body is a non-tension type rib body, the rib body is anchored in the cement-soil mixing pile at the outermost side or the cement-soil mixing pile at the inner side.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a supporting construction of foundation ditch when water proof, waterproof, can the strength characteristic of full play cement soil mixing pile stagnant water curtain, its anchor effect is more reliable. More importantly, due to the good anchoring effect of the cement-soil mixing pile, the length of the rib body material can be greatly reduced, and the rib body material is limited from the excavation surface of the foundation pit to the cement-soil mixing pile. Under the large environment of strict site red line control, the supporting construction method can exert the supporting performance of rib materials such as soil nails, anchor rods, prestressed anchor cables and the like to the maximum extent, and the application range of the site is expanded.
Drawings
FIG. 1 is a sectional view of a single cement mixing pile foundation pit support of the present invention;
FIG. 2 is a cross-sectional view of a multi-channel soil cement mixing pile foundation pit support of the present invention;
fig. 3 is a detailed view of the shotcrete surface layer structure of the present invention.
Description of reference numerals:
1. the concrete mixing pile comprises a cement mixing pile body, a rib body, a reinforcing steel mesh piece, a reinforcing rib, a concrete layer and a stretchable rib body, wherein the reinforcing steel mesh piece is arranged at the bottom of the cement mixing pile body, the reinforcing steel mesh piece is arranged at the top of the cement mixing pile body, the reinforcing steel mesh piece is arranged at the bottom of the cement mixing.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying fig. 1-3, but it should be understood that the scope of the present invention is not limited by the following detailed description. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model provides a pair of modular underground structure, include:
the cement soil mixing pile 1 is arranged on the outer side of the excavation surface of the foundation pit;
the number of the rib bodies 2 is multiple, the rib bodies are uniformly arranged between the excavation surface of the foundation pit and the cement soil mixing pile 1 in multiple rows, one end of each rib body 2 is anchored in the cement soil mixing pile, and the other end of each rib body is anchored on the excavation surface of the foundation pit;
the reinforcing mesh 3 is arranged on the excavation surface of the foundation pit, and the end part of the rib body 2, which is positioned on the excavation surface of the foundation pit, is connected with the reinforcing mesh 3 through a reinforcing rib 4;
and the concrete layer 5 is positioned on the surface of the steel mesh 3.
Wherein, the end of the rib body 2 is fixedly connected with the reinforcing rib 4 and the reinforcing mesh 3 by adopting a bolt connection or welding mode.
The reinforcement body 2 is obliquely arranged between the cement soil mixing pile 1 and a foundation pit excavation surface, the inclination angle is 5-30 degrees, the high end of the reinforcement body 2 is located on the foundation pit excavation surface, and the low end of the reinforcement body is located on the cement soil mixing pile 1.
Wherein, the rib body 2 is a stretching rib body or a non-stretching rib body.
Wherein, the thickness of the single cement mixing pile is not less than 1 m.
When the excavation depth is more than 8m, arranging a plurality of cement soil mixing piles; when the rib body 2 is a tensile rib body, the rib body is anchored in the cement mixing pile at the outermost side; when the rib body 2 is a non-tension type rib body, the rib body is anchored in the outermost cement mixing pile or the inner cement mixing pile.
When the pile body is a multi-channel pile body, a single non-stretching rib body 2 or a single stretching rib body 6 can be adopted, and the two can also be combined for use. The concrete use or combination mode of the method needs to comprehensively consider indexes such as excavation depth of the foundation pit, construction cost, deformation control requirements and the like and is determined through corresponding design calculation.
As shown in fig. 1 to fig. 3, the utility model provides a pair of cement mixing pile and muscle body material combination formula underground structure, including the concrete layer 5 of injection, the muscle body 2 and cement mixing pile 1. The cement-soil mixing pile 1 is arranged on the outer side of the excavation surface of the foundation pit within a certain distance range, one end of the rib body 2 is anchored in the cement-soil mixing pile 1, and the other end of the rib body is anchored on a sprayed concrete layer 5 on the excavation surface. Generally, when the excavation depth is smaller than 8m, only one cement mixing pile can be used, as shown in fig. 1. At the moment, the rib body material can adopt materials such as soil nails, anchor rods and the like. When the excavation depth of the foundation pit is further increased, a plurality of cement mixing piles may be used, as shown in fig. 2. At this time, the rib bodies can be non-stretching rib bodies 2 such as soil nails and anchor rods, and can also be stretching rib bodies 6 such as prestressed anchor cables, so as to further increase the constraint effect of the cement mixing pile on the sprayed concrete layer 5.
The spraying surface layer comprises a steel bar net piece 3 and a concrete layer 5, the rib body 2 is reliably connected to the steel bar net piece 3 through transverse and longitudinal reinforcing ribs 4, and then the concrete is sprayed to form an integral stressed structure.
The construction method of the combined type foundation pit supporting structure comprises the following steps:
s101, constructing cement soil mixing piles at the design positions on the outer side of the excavation surface of the foundation pit, and reliably overlapping the cement soil mixing piles to form a continuous waterproof curtain;
s102, excavating a foundation pit after the cement soil mixing pile reaches the design strength, and constructing a first row of drilled holes when the first row of reinforcement bodies are excavated to be 0.5m below the design position, wherein the length of the drilled holes penetrating through the cement soil mixing pile is not less than 1m, and the inclination angle of the drilled holes is 5-30 degrees;
s103, inserting rib body materials into the drill hole, and grouting the drill hole; the soil nail and the anchor rod type rib body need full-length grouting, and the prestressed anchor cable type rib body only needs grouting in the range of the cement soil mixing pile; constructing each row of the reinforcement bodies according to the same flow;
s104, laying a reinforcing mesh at the excavation surface of the foundation pit, and then reliably connecting the outer end of the reinforcement material to the reinforcing mesh through transverse and longitudinal reinforcing ribs to form a stressed whole, wherein the connection mode is preferably welding or bolt connection;
and S105, after the connection of the rib body material and the reinforcing mesh is finished, spraying concrete on the excavated surface to finish the construction of the cement mixing pile and rib body material combined type foundation pit supporting structure, and when the rib body material is a prestressed anchor cable, additionally applying prestress to the rib body material and anchoring the rib body material on the sprayed concrete surface layer.
When the rib body is a non-tension type rib body such as a soil nail and an anchor rod, full-length grouting is needed, and when the rib body is a tension type rib body such as a prestressed anchor cable, grouting is only carried out in the range of the cement mixing pile.
In a word, the utility model discloses the construction is simple and convenient, does not need large-scale complicated mechanical equipment, for other excavation supporting worker methods, because make full use of has had the self high strength characteristic of stagnant water curtain structure, and need not additionally set up other retaining structures again, therefore its cost is lower, has apparent economic benefits. In addition, because the length of the rib material in the supporting structure is short, the red line of the surrounding buildings cannot be invaded, and therefore the field application range of the rib material such as soil nails, anchor rods, prestressed anchor cables and the like can be greatly expanded.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. A modular excavation supporting construction, its characterized in that includes:
the cement soil mixing pile (1) is arranged on the outer side of the excavation surface of the foundation pit;
the number of the rib bodies (2) is multiple, the rib bodies are uniformly arranged between the excavation surface of the foundation pit and the cement soil mixing pile (1) in multiple rows, one end of each rib body (2) is anchored in the cement soil mixing pile, and the other end of each rib body is anchored on the excavation surface of the foundation pit;
the reinforcing steel bar net piece (3) is arranged on the excavation surface of the foundation pit, and the end part of the rib body (2) positioned on the excavation surface of the foundation pit is connected with the reinforcing steel bar net piece (3) through a reinforcing rib (4);
and the concrete layer (5) is positioned on the surface of the steel mesh (3).
2. The combined foundation pit supporting structure according to claim 1, wherein the end of the reinforcement body (2) is fixedly connected with the reinforcing rib (4) and the reinforcing mesh (3) by bolts or welding.
3. The combined foundation pit supporting structure according to claim 1, wherein the reinforcement body (2) is obliquely arranged between the cement-soil mixing pile (1) and the excavation surface of the foundation pit, the inclination angle is 5-30 degrees, and the high end of the reinforcement body (2) is positioned on the excavation surface of the foundation pit and the low end is positioned on the cement-soil mixing pile (1).
4. The modular foundation pit supporting structure according to claim 1, wherein the tendon body (2) is a tension tendon body or a non-tension tendon body.
5. The modular foundation pit supporting structure of claim 4, wherein the thickness of the single cement-soil mixing pile is not less than 1 m.
6. The combined foundation pit supporting structure of claim 5, wherein when the excavation depth is more than 8m, a plurality of cement-soil mixing piles are arranged; when the rib body (2) is a tensile rib body, the rib body is anchored in the cement mixing pile at the outermost side; when the rib body (2) is a non-tension type rib body, the rib body is anchored in the cement-soil mixing pile at the outermost side or the cement-soil mixing pile at the inner side.
CN202021922327.1U 2020-09-04 2020-09-04 Combined foundation pit supporting structure Expired - Fee Related CN212506313U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021922327.1U CN212506313U (en) 2020-09-04 2020-09-04 Combined foundation pit supporting structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021922327.1U CN212506313U (en) 2020-09-04 2020-09-04 Combined foundation pit supporting structure

Publications (1)

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CN212506313U true CN212506313U (en) 2021-02-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113005991A (en) * 2021-03-08 2021-06-22 广东浩禹建设有限公司 High-strength anti-seismic water conservancy slope anchor cable structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113005991A (en) * 2021-03-08 2021-06-22 广东浩禹建设有限公司 High-strength anti-seismic water conservancy slope anchor cable structure

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20210209

Termination date: 20210904