CN218508450U

CN218508450U - Foundation pit supporting structure close to underground tunnel

Info

Publication number: CN218508450U
Application number: CN202222443280.6U
Authority: CN
Inventors: 吴立; 陈亮; 郭鼎中; 辛素敏
Original assignee: Zhuhai Huafa City Research Institute Co ltd
Current assignee: Zhuhai Huafa City Research Institute Co ltd
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2023-02-21
Anticipated expiration: 2032-09-15

Abstract

The utility model provides a foundation pit supporting structure close to an underground tunnel, which relates to the technical field of foundation pit construction and comprises row piles, a separation wall and a plurality of inner supports, wherein the separation wall is arranged in parallel to the tunnel and is connected with one end surface of the row piles; the inner support is perpendicular to the row piles and connected with the other end face of the row piles. When the earthwork at the inner side of the foundation pit is excavated, the lateral deformation of the underground tunnel is reduced.

Description

Foundation pit supporting structure close to underground tunnel

Technical Field

The utility model relates to a foundation ditch construction technical field, concretely relates to close on underground tunnel's excavation supporting construction.

Background

Underground tunnel passes closely like following building basement foundation ditch supporting structure side, and when the inboard earthwork of foundation ditch was excavated, the unbalance of both sides soil body will produce the soil body pressure that removes to the foundation ditch direction, leads to underground tunnel can take place the lateral deformation along with the effect of soil body pressure, and in the weak soil layer, the tunnel is in the foundation ditch side and will take place bigger lateral deformation, and then influences the structure safety in tunnel.

Therefore, the utility model provides a close on underground tunnel's underground structure.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a close on underground tunnel's underground structure, when the inboard earthwork of foundation ditch excavates, can reduce underground tunnel's side direction and warp.

The technical scheme of the utility model is realized like this:

a foundation pit supporting structure close to an underground tunnel comprises row piles, a partition wall and a plurality of inner supports, wherein the partition wall is arranged in parallel to the tunnel and is connected with one end face of each row pile; the inner support is perpendicular to the row piles and connected with the other end face of the row piles.

Preferably, the partition wall is formed by mutually engaging and connecting a plurality of triaxial mixing piles.

Preferably, the partition wall is in meshed connection with the row piles through the triaxial mixing piles.

Preferably, the first gap structure formed by the inner support close to the ground surface and the adjacent inner support is the inner side of a foundation pit.

Preferably, a second gap structure is formed between the adjacent inner support and the foundation pit reinforcing wall, and the edge of the second gap structure, which abuts against the foundation pit reinforcing wall, is the foundation pit bottom; the foundation pit reinforcing wall is parallel to the inner support and connected with the row piles.

Preferably, one end of the partition wall, the row of piles and one of the inner supports is flush with the ground surface.

Compared with the prior art, the utility model has the advantages of it is following.

By adopting the structure, the isolation wall is arranged in parallel to the tunnel and is connected with one end face of the row pile; the inner support is perpendicular to the row piles and connected with the other end face of the row piles. The isolation wall is organically combined with the row piles and the inner supports to form a supporting structure with high rigidity, and therefore lateral deformation of the underground tunnel is reduced when earthwork on the inner side of the foundation pit is excavated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a cross-sectional view of a foundation pit supporting structure near an underground tunnel of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;

the attached drawings are as follows: 1-row of piles; 2-a separation wall; 3, internal support; 301-inside of foundation pit; 302-base pit bottom; 303-foundation pit reinforced walls; 4, tunneling; 5-the earth's surface.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do 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. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides a foundation pit supporting structure close to an underground tunnel, which comprises a row pile 1, a partition wall 2 and a plurality of inner supports 3, wherein the partition wall 2 is arranged in parallel to a tunnel 4 and is connected with one end face of the row pile 1; the inner support 3 is arranged perpendicular to the row pile 1 and connected with the other end face of the row pile 1. The campshed 1 generally adopts reinforced concrete bored concrete pile, and interior support 3 adopts the reinforced concrete system, and campshed 1 and interior support 3 combine to form preliminary supporting structure system, and pastes the campshed outside the foundation ditch and sets up the division wall 2 that cement mixing pile constitutes to form the anti side system that rigidity is great with preliminary supporting structure system.

In this embodiment, as shown in fig. 1, the partition wall 2 is formed by a plurality of triaxial mixing piles which are engaged with each other. The division wall comprises the triaxial cement mixing stake of three rows, and three rows of triaxial cement mixing stake diameters generally are 850mm, and 200mm is connected in the mutual interlock of two directions between the stake to constitute the anti lateral wall body of rigidity that a slice has certain width, the lateral displacement in tunnel under the foundation ditch excavation that can significantly reduce, the bias voltage effect that the tunnel bore can be reduced, adopt tunnel segment structure crack width to diminish to a great extent behind the division wall protection.

In this embodiment, as shown in fig. 1, division wall 2 is connected with the interlock of campshed 1 through triaxial stirring stake, ensures foundation ditch stagnant water effect more, avoids soil erosion and water loss to cause adverse effect to foundation ditch safety.

In the present embodiment, as shown in fig. 2, the first gap structure formed by the inner support 3 close to the ground surface 5 and the adjacent inner support 3 is the inner side 301 of the foundation pit.

In this embodiment, as shown in fig. 2, a second gap structure is formed between the adjacent inner support 3 and the foundation pit reinforcing wall 303, and an edge of the second gap structure abutting against the foundation pit reinforcing wall 303 is a foundation pit bottom 302; the foundation pit reinforcing wall is parallel to the inner support and is connected with the row piles 1.

In this embodiment, as shown in fig. 2, one end of the partition wall 2, the row pile 1 and one of the inner supports 3 is flush with the ground surface 5, so that additional technical requirements are not required, and the construction is convenient, safe and controllable.

In this embodiment, three rows of triaxial cement mixing piles are organically combined with the row piles and the inner supports to form a supporting system with strong rigidity, and compared with the traditional underground continuous wall, the lateral displacement of the underground tunnel during foundation pit excavation can be greatly reduced, and the relevant requirements of national regulations and the like are met. The bias effect that the tunnel bore can be reduced, experience is calculated, and tunnel segment structure crack width diminishes to a great extent after adopting the partition wall protection, in the allowed value within range. The interlock of three rows of triaxial cement mixing piles and campshed is connected, ensures foundation ditch stagnant water effect more, avoids soil erosion and water loss to cause adverse effect to foundation ditch safety. The method does not need extra technical requirements, is convenient to construct, safe and controllable, and is particularly suitable for geological conditions of soft soil layers. Because only need arrange three rows of triaxial cement mixing stake to approaching tunnel one side, belong to accurate enhancement. Under the same condition, the construction cost is saved by about 20-30% compared with the traditional underground continuous wall supporting mode.

The working principle is as follows: by adopting the structure, the partition wall is arranged in parallel to the tunnel and is connected with one end face of the row of piles; the inner support is perpendicular to the row piles and connected with the other end face of the row piles. The isolation wall is organically combined with the row piles and the inner supports to form a supporting system with high rigidity, and therefore lateral deformation of the underground tunnel is reduced when earthwork on the inner side of the foundation pit is excavated. The lateral displacement of tunnel under can significantly reduce foundation ditch excavation time, the bias effect that can reduce the tunnel and bear, tunnel segment structure crack width diminishes to a great extent after adopting the division wall protection. Guarantee foundation ditch stagnant water effect more, avoid soil erosion and water loss to cause adverse effect to foundation ditch safety.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a close on underground tunnel's excavation supporting construction which characterized in that: the device comprises row piles (1), a partition wall (2) and a plurality of inner supports (3), wherein the partition wall (2) is arranged in parallel to a tunnel (4) and is connected with one end face of each row pile (1); the inner support (3) is perpendicular to the row piles (1) and is connected with the other end face of the row piles (1).

2. A foundation pit supporting structure adjacent to an underground tunnel according to claim 1, wherein: the partition wall (2) is formed by mutually engaging and connecting a plurality of triaxial stirring piles.

3. A foundation pit supporting structure adjacent to an underground tunnel according to claim 2, wherein the partition wall (2) is in occlusion connection with the row piles (1) through triaxial mixing piles.

4. A foundation pit supporting structure near an underground tunnel according to claim 3, characterized in that the first gap structure formed by the inner support (3) near the ground surface (5) and the adjacent inner support (3) is the inner side (301) of the foundation pit.

5. The foundation pit supporting structure adjacent to the underground tunnel according to claim 4, wherein a second gap structure is formed by the adjacent inner support (3) and the foundation pit reinforcing wall (303), and the edge of the second gap structure, which is abutted to the foundation pit reinforcing wall (303), is a foundation pit bottom (302); the foundation pit reinforcing wall is parallel to the inner support and is connected with the row piles (1).

6. A foundation pit supporting structure adjacent to an underground tunnel according to any one of claims 3-5, wherein one end of the partition wall (2), the row of piles (1) and one of the inner supports (3) is flush with the ground surface (5).