CN215594060U

CN215594060U - Wall structure is led to diaphragm wall that narrow space is close to pipeline

Info

Publication number: CN215594060U
Application number: CN202121727245.6U
Authority: CN
Inventors: 雍毅; 林登辉; 李永亮; 许永祥; 宁利锟; 胡学炜; 李宁
Original assignee: CCCC Tunnel Engineering Co Ltd; CCCC First Highway Xiamen Engineering Co Ltd
Current assignee: CCCC Tunnel Engineering Co Ltd; CCCC First Highway Xiamen Engineering Co Ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-01-21
Anticipated expiration: 2031-07-28

Abstract

The utility model relates to the technical field of subway foundation pit construction, and discloses a diaphragm wall guide wall structure adjacent to a pipeline in a narrow space, which comprises a reinforcement cage internally poured with concrete, wherein a guide wall bottom plate is arranged on the upper side surface of the bottom end of the reinforcement cage, a deep pipeline and a shallow pipeline are sequentially arranged at the top end of the guide wall bottom plate upwards, the deep pipeline and the shallow pipeline are separated by a filling layer, a guide wall top plate is arranged at the top end of the filling layer above the shallow pipeline, and the guide wall top plate is in close contact with the bottom surface of the top end of the reinforcement cage; the utility model can carry out relocation protection on the underground pipeline, and avoids potential safety hazard and economic loss caused by the damage of the underground pipeline caused by construction.

Description

Wall structure is led to diaphragm wall that narrow space is close to pipeline

Technical Field

The utility model relates to the technical field of subway foundation pit construction, in particular to a diaphragm wall guide wall structure adjacent to a pipeline in a narrow space.

Background

The subway station is built in a dense city area, the construction site is narrow, pipelines around the station are complex and complicated, the variety of the pipelines is more, and especially military optical cables and gas pipelines have huge potential safety hazards and economic loss after being damaged; therefore, the pipeline needs to be temporarily moved, changed and protected before construction, and the pipeline is prevented from being damaged during construction.

In a foundation pit enclosure structure of a dense city area, an underground continuous wall is often adopted as the enclosure structure; in order to ensure the position and grooving quality of the underground continuous wall, an L-shaped or inverted L-shaped guide wall is usually adopted to ensure the position and grooving quality of the underground continuous wall and bear the static and dynamic loads of a reinforcement cage, a drilling machine and the like of the underground continuous wall. This form and construction method has the following four disadvantages: (1) the L-shaped guide wall can cause soil body loss in rainy seasons, so that the side wall of the guide wall is inclined and damaged under dynamic and static loads of machines such as a reinforcement cage and a drilling machine, and the quality of the underground continuous wall cannot be guaranteed; (2) when a pipeline needing to be protected is placed on the L-shaped guide wall, the ground can be settled under the walking and loading action of heavy machinery, so that the pipeline is damaged; (3) the inverted L-shaped guide wall is a single-side template during construction, the effective thickness of the side wall cannot be ensured, and the side wall is easy to break and incline during construction, so that the quality of the underground continuous wall is reduced; (4) the underground diaphragm wall adopts a slurry retaining wall during construction, the lower part of the inverted L-shaped guide wall can cause soil loss due to the flushing of slurry, and the normal use of a pipeline at the position cannot be ensured; brings great inconvenience to construction and use.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a guide wall structure of an underground diaphragm wall adjacent to a pipeline in a narrow space, which can be used for carrying out relocation protection on the underground pipeline and avoiding potential safety hazards and economic losses caused by the damage of construction on the underground pipeline.

The utility model adopts the following technical scheme:

the utility model provides a wall structure is led to even wall of neighbouring pipeline in narrow space, has concrete's steel reinforcement cage including the internal pouring, and the side is provided with leads the wall bottom plate on the bottom of steel reinforcement cage, leads wall bottom plate top and upwards has set gradually deep pipeline and shallow pipeline, and separates through the filling layer between deep pipeline and the shallow pipeline, and the filling layer top that is located shallow pipeline top is provided with leads the wall roof, leads wall roof and steel reinforcement cage top bottom surface in close contact with.

The reinforcement cage is C-shaped.

And a cushion layer is arranged at the bottom end of the steel reinforcement cage.

The vertical height of the cushion layer is 5 cm.

And one ends of the guide wall top plate and the guide wall bottom plate, which are close to the reinforcement cage, are chamfered.

The horizontal length of the reinforcement cage is larger than that of the deep pipeline and the shallow pipeline.

The filling layer is stone chips and high-quality soil.

Compared with the prior art, the utility model has the beneficial effects that: the C-shaped reinforcement cage is used as a guide wall bearing structure, important pipelines can be effectively protected, the effective safe distance between the protected pipelines can be ensured by arranging the filling layer, the mutual influence of some pipelines is avoided, the integral bearing capacity of the utility model is enhanced, no extra protection measures are needed, and the influence of mechanical equipment on the pipelines during construction is avoided.

Furthermore, the guide wall structure has small deformation under the action of various loads, the structural shape can be controlled, the stress concentration can be effectively reduced, the integrity is good, the guide wall structure is not easy to damage, and the effective bearing capacity can be generated; the side wall is not easy to incline, the verticality quality of the diaphragm wall structure can be well guaranteed, and the practicability of the diaphragm wall structure is improved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

The utility model will now be described more fully hereinafter with reference to the accompanying drawings and examples in which:

as shown in fig. 1, the underground diaphragm wall guide wall structure of the adjacent pipeline in the narrow space of the utility model comprises a C-shaped reinforcement cage 1 poured with concrete, wherein the C-shaped reinforcement cage 1 can improve the overall stress capacity of the guide wall structure, and the horizontal length of the reinforcement cage 1 is greater than the horizontal lengths of a deep pipeline 2 and a shallow pipeline 3 so as to improve the protection capacity of the deep pipeline 2 and the shallow pipeline 3; the bottom end of the reinforcement cage 1 is provided with the cushion layer 4, the cushion layer 4 is formed by pouring concrete, the height of the cushion layer 4 is preferably 5cm, and the cushion layer 4 is arranged, so that on one hand, the bearing capacity of the guide wall structure can be improved when the guide wall structure is used, the phenomenon that the whole guide wall structure is deformed or inclined due to the influence of factors such as external gravity and the like is avoided, and meanwhile, the phenomenon that the reinforcement cage 1 is corroded can also be avoided; on the other hand, the cushion layer 4 can provide a flat bottom surface for the arrangement of the guide wall, so that the stability of the guide wall structure is ensured.

A guide wall bottom plate 5 is arranged on the upper side of the bottom end of the steel reinforcement cage 1, a deep pipeline 2 and a shallow pipeline 3 are sequentially arranged at the top end of the guide wall bottom plate 5 upwards, the deep pipeline 2 and the shallow pipeline 3 are separated by a filling layer 6, a guide wall top plate 7 is arranged at the top end of the filling layer 6 above the shallow pipeline 3, and the guide wall top plate 7 is in close contact with the bottom surface of the top end of the steel reinforcement cage 1; wherein the guide wall bottom plate 5 and the guide wall top plate 7 are both formed by pouring concrete; the deep pipeline 2 is suitable for arranging a rainwater pipe and a sewage pipe, and the shallow pipeline 3 is suitable for arranging a high-voltage cable, a low-voltage cable, an optical cable, a water supply pipe and a gas pipe; the filling layer 6 is stone chips and high-quality soil, wherein the filling compactness of the stone chips in the protection range of the deep pipeline 2 and the shallow pipeline 3 is more than 95% so as to ensure the bearing capacity of the guide wall structure, and the protection ranges of the deep pipeline 2 and the shallow pipeline 3 are different according to different arranged pipelines.

According to the utility model, the chamfer is arranged at one end of the guide wall top plate 7 and one end of the guide wall bottom plate 5 close to the reinforcement cage 1, so that the bearing capacity of the guide wall structure can be improved, the acting force applied to the guide wall structure during construction can be buffered, the situation that one ends of the guide wall top plate 7 and one end of the guide wall bottom plate 5 close to the reinforcement cage 1 are cracked due to stress is avoided, and the practicability of the utility model is improved.

The construction method comprises the following steps: s1: measuring and paying off, and carrying out pipeline exploration and excavation at the position of a guide wall;

s2: fully driving Larsen steel sheet piles outside the side line of the guide wall and the pipeline range;

s3: excavating a guide wall, and taking protection measures on pipelines;

s4: excavating to a designed elevation, processing the foundation soil, and pouring a cushion layer 4;

s5: binding reinforcing steel bars of a bottom plate of the reinforcing cage 1, supporting a formwork, pouring concrete of the bottom plate of the reinforcing cage 1, maintaining, chiseling, binding side wall reinforcing steel bars, supporting the formwork and pouring concrete;

s6: pouring concrete of the guide wall bottom plate 5, after the concrete of the guide wall bottom plate 5 is solidified and cured, placing a pipeline to be protected and modified on the guide wall bottom plate 5 according to requirements, backfilling stone chips and tamping, and ensuring that the compactness in the pipeline protection range is more than 95%;

s7: backfilling high-quality soil, leveling and tamping, and pouring concrete of a top plate 7 of the guide wall;

s8: binding reinforcing steel bars, supporting a template, pouring concrete on a top plate of the C-shaped reinforcement cage 1, and maintaining;

s9: and constructing an inner guide wall, and pulling out the Larsen steel sheet pile.

When the guide wall is excavated, manual excavation and finishing are adopted within the pipeline protection distance; in S6, backfilling artificially within the protection range of the pipeline, and compacting with water; and in S8, the top plate is sloped to the inner side of the enclosure structure according to 0.4 percent, so that the directional flow of the slurry during the construction of the enclosure structure is ensured. The utility model has small deformation under the action of various loads, controllable structural shape, capability of effectively reducing stress concentration, good integrity, difficult damage and capability of generating effective bearing capacity; the side wall is difficult for inclining, and the quality of the perpendicularity of the diaphragm wall structure can be well guaranteed.

Claims

1. The utility model provides a wall structure is led to ground of adjacent pipeline in narrow space even wall which characterized in that: including the steel reinforcement cage that has built the concrete in inside, the side is provided with leads the wall bottom plate on the bottom of steel reinforcement cage, leads wall bottom plate top and upwards has set gradually deep pipeline and shallow pipeline, and separates through the filling layer between deep pipeline and the shallow pipeline, and the filling layer top that is located shallow pipeline top is provided with leads the wall roof, leads wall roof and steel reinforcement cage top bottom surface in close contact with.

2. The underground diaphragm wall guide wall structure of the narrow space adjacent to the pipeline according to claim 1, wherein: the reinforcement cage is C-shaped.

3. The underground diaphragm wall guide wall structure of the narrow space adjacent to the pipeline according to claim 1, wherein: and a cushion layer is arranged at the bottom end of the steel reinforcement cage.

4. The underground diaphragm wall guide wall structure of the narrow space adjacent to the pipeline according to claim 3, wherein: the vertical height of the cushion layer is 5 cm.

5. The underground diaphragm wall guide wall structure of the narrow space adjacent to the pipeline according to claim 1, wherein: and one ends of the guide wall top plate and the guide wall bottom plate, which are close to the reinforcement cage, are chamfered.

6. The underground diaphragm wall guide wall structure of the narrow space adjacent to the pipeline according to claim 1, wherein: the horizontal length of the reinforcement cage is larger than that of the deep pipeline and the shallow pipeline.

7. The underground diaphragm wall guide wall structure of the narrow space adjacent to the pipeline according to claim 1, wherein: the filling layer is stone chips and high-quality soil.