CN220580008U

CN220580008U - Non-support combined deep foundation pit supporting structure

Info

Publication number: CN220580008U
Application number: CN202322091733.8U
Authority: CN
Inventors: 刘辉; 韩卫东
Original assignee: Guangzhou University of Science and Technology
Current assignee: Guangzhou University of Science and Technology
Priority date: 2023-08-04
Filing date: 2023-08-04
Publication date: 2024-03-12
Anticipated expiration: 2033-08-04

Abstract

The utility model belongs to the technical field of building construction, in particular to a support structure of a support-free combined deep foundation pit, which aims at the technical problems that the application range and the excavation depth of the existing filling pile for single use are limited, and the site has no slope-releasing condition, and provides the following scheme, wherein the support structure comprises a soil layer, a waterproof curtain and a support structure, and the foundation pit is arranged at the top of the soil layer; the utility model has the advantages of good structural integrity, good seepage-proofing effect, high efficiency in pile forming process, and the functions of enclosing structure and seepage-proofing effect in complex surrounding environment, more pipelines and nearby built multi-layer basements of buildings, solves the problems of stress and limited surrounding environment of the supporting structure compared with other enclosing structure forms meeting the same engineering requirements, does not need structural measures such as inner support construction, and the like, and simultaneously the cover plate of the construction has the double functions of site hardening at the top of the foundation pit, reduces the cost of the supporting structure, improves the construction efficiency of the foundation pit excavation and the main structure, and has obvious comprehensive economic benefit.

Description

Non-support combined deep foundation pit supporting structure

Technical Field

The utility model relates to the technical field of building construction, in particular to a support-free combined deep foundation pit supporting structure.

Background

The conventional support mode of the deep foundation pit bored concrete pile and the anchor cable is capable of enabling the construction progress of the main structure to be faster after the deep foundation pit is excavated to the bottom, avoiding the influence of the support to the construction period, but the anchor cable can extend to a larger range beyond the support structure, and because the surrounding environment of the deep foundation pit is complex, the multi-layer basement of a built building and the surrounding buried pipelines are close to each other, the requirement on deformation control is higher, the bored concrete pile is used alone, the application range and the excavation depth are limited, and no slope releasing condition exists in the field.

Disclosure of Invention

The utility model provides a support-free combined deep foundation pit supporting structure, which solves the problems that the application range and the excavation depth of a single-use filling pile proposed in the background technology are limited, and the site is free from sloping conditions.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the support structure of the non-support combined deep foundation pit comprises a soil layer, a waterproof curtain and a support structure, wherein the foundation pit is arranged at the top of the soil layer, and the waterproof curtain is fixedly connected with the inner wall of the soil layer;

the waterproof curtain comprises supporting structures which are distributed at equal intervals along the circumference direction of the foundation pit, each supporting structure comprises two groups of filling piles, and the two groups of filling piles in the same group of supporting structures are respectively positioned at the inner side and the outer side of the foundation pit;

the supporting structure consists of anchor cables, a cover plate and a capping beam, the tops of two groups of filling piles in the same group of supporting structures are fixedly connected through the capping beam, holes are formed in the cover plate fixedly at the tops of the capping beams, and the anchor cables are fixedly connected with the holes in the cover plate through anchors.

Preferably, the included angle between the anchor cable and the cast-in-situ pile is 25-30 DEG

According to the utility model, after the triaxial stirring pile is constructed, the filling pile is constructed in time to form a vertical supporting structure, so that the filling pile and surrounding soil body form a waterproof curtain to block water and enhance soil body stability, the filling pile is connected with the free ends of the tops of the filling piles at intervals outside the foundation pit to form a double-wall integral structure, the time of supporting and changing the support is reduced, the occupied area is small, and the structural stability is good; meanwhile, the pre-stressed anchor cable is constructed and grouting is carried out through reserving the pre-stressed anchor cable construction hole, the strength and the rigidity of the supporting structure are greatly improved, the pre-stressed anchor cable and the cast-in-place pile form effective constraint, and acting force of soil after deep foundation pit excavation is resisted; the structure has the advantages of good integrity, good seepage-proofing effect, high efficiency in the piling process, complex surrounding environment, more pipelines and the like, and has the functions of enclosing structure and seepage-proofing effect, compared with other enclosing structure forms reaching the same engineering requirement, the structure solves the problems of stress and limited surrounding environment of the supporting structure, no structural measures such as inner support are needed to be constructed, and meanwhile, the constructed cover plate plays the double role of site hardening at the top of the foundation pit, the cost of the supporting structure is reduced, the construction work efficiency of the foundation pit excavation and the main structure is improved, and the comprehensive economic benefit is obvious.

Drawings

Fig. 1 is a schematic structural diagram of a support structure of a combined deep foundation pit without support according to the present utility model.

FIG. 2 is a schematic plan view of a support structure for a deep foundation pit without support

Reference numerals in the drawings: 100. a soil layer; 101. a foundation pit; 200. a waterproof curtain; 201. filling piles; 202. a cover plate; 300. a support structure; 301. an anchor cable; 302. and (5) pressing the top beam.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 1-2, a support-free combined deep foundation pit supporting structure comprises a soil layer 100, a waterproof curtain 200 and a supporting structure 300, wherein a foundation pit 101 is arranged at the top of the soil layer 100, and the waterproof curtain 200 is fixedly connected with the inner wall of the soil layer 100;

the waterproof curtain 200 comprises supporting structures which are equidistantly distributed along the circumferential direction of the foundation pit 101, each supporting structure comprises two groups of filling piles 201, and the two groups of filling piles 201 in the same supporting structure are respectively positioned at the inner side and the outer side of the foundation pit 101;

the supporting structure 300 consists of anchor cables 301, a cover plate 202 and a top beam 302, wherein the tops of two groups of cast-in-place piles 201 in the same group of supporting structures are fixedly connected through the top beam 302, the top of the top beam 302 is fixedly provided with a hole on the cover plate 202, and the anchor cables 301 are fixedly connected with the hole on the cover plate 202 through an anchor;

in this embodiment: the included angle between the anchor cable 301 and the cast-in-place pile 201 is 25-30 degrees;

working principle: cement is injected into a soil layer 100 through triaxial stirring pile drilling, and is fully stirred, after triaxial stirring pile construction is completed, a filling pile 201 is timely constructed to form a vertical supporting structure, the filling pile 201 and surrounding soil body form a waterproof curtain 200 to block water and enhance soil stability, the filling pile 201 and the free end at the top of the filling pile 201 at intervals outside a foundation pit 101 are connected to form a double-wall integral structure, support-dismantling and support-changing time is shortened, occupied area is small, structural stability is good, the filling pile is connected through a reinforced concrete crown beam (a capping beam 302) and a cover plate 202, holes for constructing a pre-stressed anchor cable 301 are reserved on the cover plate 202, after the strength of the crown beam (the capping beam 302) and the concrete cover plate 202 meet design requirements, the pre-stressed anchor cable 301 is connected to the pre-stressed anchor cable 301 reserved at a construction hole of the cover plate 202 through an anchor, the pre-stressed anchor cable 301 and the filling pile 202 are constructed at a certain angle, the pre-stressed anchor cable 301 is constructed at an angle of 25-30 DEG, the pre-stressed anchor cable 301 is reserved at the construction hole is constructed and is grouted, the pre-stressed anchor cable 301 is greatly improved in the strength and rigidity of the supporting structure, the pre-stressed anchor cable 301 is effectively restrained by the construction hole, the pre-stressed anchor cable 201 is formed and the pre-stressed anchor cable is excavated until the soil body is excavated to a deep foundation pit is hung in time; the problem of supporting construction atress and the limited problem of surrounding environment are solved, structural measures such as inner support need not be under construction again to the apron of construction plays the site hardening dual function at the foundation ditch top simultaneously, reduces supporting construction cost, improves foundation ditch excavation and major structure construction work efficiency, and comprehensive economic benefits is very obvious.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. The utility model provides a no support combination formula deep basal pit supporting construction, includes soil layer (100), waterproof curtain (200) and supporting construction (300), its characterized in that, foundation ditch (101) are seted up at the top of soil layer (100), waterproof curtain (200) are fixed connection with the inner wall of soil layer (100);

the waterproof curtain (200) comprises supporting structures which are distributed at equal intervals along the circumferential direction of the foundation pit (101), the supporting structures comprise two groups of filling piles (201), and the two groups of filling piles (201) in the same group of supporting structures are respectively positioned at the inner side and the outer side of the foundation pit (101);

the supporting structure (300) is composed of anchor cables (301), cover plates (202) and top beams (302), the tops of two groups of filling piles (201) in the same group of supporting structures are fixedly connected through the top beams (302), the cover plates (202) are fixedly arranged at the tops of the top beams (302), holes are formed in the cover plates (202), and the anchor cables (301) are fixedly connected with the holes in the cover plates (202) through anchors.

2. A combined deep foundation pit supporting structure without support according to claim 1, characterized in that the angle between the anchor lines (301) and the cast-in-place piles (201) is in the range of 25 ° -30 °.