CN207750084U - The closely connected construction supporting structure for passing through existing building of newly-built underground engineering - Google Patents

Abstract

The utility model relates to the technical field of construction support for underground engineering, and discloses a construction support structure for newly-built underground engineering to pass through existing buildings closely. The pipe curtain of the utility model is formed by a group of round steel pipes arranged side by side, and two notches are opened on the side wall of the lower semicircle of each round steel pipe, and the two notches are arranged symmetrically along the length direction of the round steel pipe; An inner connection plate is arranged inside each round steel pipe, and the inner connection plate is arranged along the length direction of the round steel pipe. The two sides and the lower edges of the gaps on both sides are welded and fixed; The connecting plate is arranged along the length direction of the round steel pipe, and the two sides are respectively welded and fixed to the lower edges of the two adjacent gaps; the round steel pipe located outside the pipe curtain and the inner connecting plate and the outer connecting plate are located outside the pipe curtain Concrete is poured on one side. The utility model has high support strength, high stability and convenient construction.

Description

The construction support structure of the new underground project closely passing through the existing building

technical field

The utility model relates to the technical field of construction support for underground engineering, in particular to a construction support structure for newly-built underground engineering to pass through existing buildings closely.

Background technique

With the rapid development of domestic rail transit and the maturity of subway construction technology, there are more and more cases of intersecting, paralleling, connecting and co-construction among various rail lines. At present, most of the underground rail transit lines under construction in Beijing are In the urban area, there are many intersections and overlaps with the existing rail transit lines, and there are a large number of projects that pass through the existing stations (or sections).

The construction of new underground structures will inevitably lead to the deformation of existing structures and the increase of internal force. When the bearing capacity or allowable value is exceeded, the normal use of existing structures may be affected, and even the structure may be damaged, endangering safety. When the new structure is used to pass through the existing structure closely, the deformation requirements and settlement control of the existing structure are more stringent. The traditional construction method converts a large section into a small pilot tunnel, excavates in sections, and supports in sections at the same time. After the excavation is completed, the construction of the permanent concrete structure is carried out. The impact on the existing structure is relatively large. When excavating a large area of soil, it is easy to cause ground subsidence or deformation of the existing structure due to the instability of the face.

Utility model content

The utility model provides a construction support structure with high support strength, high stability and convenient construction for a new underground project to pass through an existing building closely.

The technical problem to be solved is: the existing support method has a great influence on the existing structure during the construction of the new project, and when excavating a large area of soil, it is easy to cause problems caused by the instability of the face. Land subsidence or deformation of existing structures.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

The utility model is a construction support structure for a newly built underground project that closely passes through an existing building, including a pipe curtain, an inner connecting plate, an outer connecting plate and a grouting water-stop structure.

The pipe curtain is formed by a group of round steel pipes arranged side by side. There are two notches on the semicircle of each round steel pipe near the inner side of the pipe curtain. The two notches are rectangular. The central axis in the cloth direction is arranged symmetrically to the symmetrical axis, and the gap is set along the length direction of the round steel pipe; each round steel pipe is provided with an inner connecting plate, and the inner connecting plate is set along the length direction of the round steel pipe. The two sides and the lower edges of the notches on both sides are welded and fixed; an outer connection plate is arranged between adjacent round steel pipes, and the outer connection plate is arranged along the length direction of the round steel pipe. The lower edges of the two gaps are fixed by welding;

Concrete is poured between the round steel pipe on the outer side of the pipe curtain and the inner connecting plate and the outer side of the outer connecting plate on the outer side of the pipe curtain, and a grouting stop is set on the outer side of the concrete on the outer connecting plate side and between the adjacent round steel pipes. water structure.

The new underground project of the utility model closely adheres to the construction support structure passing through the existing buildings. Further, the outer diameter of the round steel pipe is 2000mm, and the wall thickness is not less than 20mm.

The new underground project of the utility model closely passes through the construction support structure of the existing building, and further, the minimum distance between the adjacent circular steel pipes does not exceed 600mm.

The new underground project of the utility model closely adheres to the construction support structure passing through the existing building. Further, the width of the gap is 1/3-2/3 of the radius of the round steel pipe.

The new underground project of the utility model closely adheres to the construction support structure passing through the existing buildings. Further, the inner connecting plate and the outer connecting plate are both steel plates with a thickness of not less than 10 mm.

In the utility model, the newly-built underground project closely passes through the construction support structure of the existing building. Further, the thickness of the concrete on one side of the outer connecting plate is not less than the width of the gap.

Compared with the prior art, the utility model has the following beneficial effects on the construction support structure of the newly-built underground project that passes through the existing building closely:

The utility model has a simple structure of the construction support structure of the new underground project that closely passes through the existing building. construction, reducing the impact of construction on the surrounding stratum and existing structures, effectively avoiding ground subsidence or causing deformation of existing structures; the utility model is convenient for construction, and the connecting plate is set between the pipe curtains, and then concrete is directly poured, eliminating The temporary inverted arch and the middle partition in the traditional support structure are eliminated, and the dismantling of formwork and scaffolding is omitted, which greatly reduces the construction workload, reduces material consumption and construction costs, reduces environmental pollution, improves construction efficiency, and shortens construction time. The cycle improves the safety of construction and the quality of construction is more guaranteed.

In the utility model, an inner connecting plate coherently connected with the outer connecting plate is arranged in the round steel pipe, and concrete is poured in the round steel pipe above the inner connecting plate. Steel pipes increase the usable area of new underground works.

Below in conjunction with accompanying drawing, the construction support structure that the new underground project of the present utility model sticks closely passes through the existing building is further described.

Description of drawings

Fig. 1 is the structural representation of the construction support structure of the utility model newly-built underground engineering closely sticking through the existing building;

Figure 2 is a schematic diagram of the construction structure of the new project after completion.

Reference signs:

1-pipe curtain; 11-round steel pipe; 2-inner connecting plate; 3-outer connecting plate; 4-grouting water-stop structure; 5-concrete; 6-bottom plate.

Detailed ways

As shown in Fig. 1, the construction support structure of the new underground project of the utility model that closely passes through the existing building includes a pipe curtain 1, an inner connecting plate 2, an outer connecting plate 3 and a grouting water-stop structure 4,

The pipe curtain 1 is rectangular, circular or arched, and is set close to the existing building. It is formed by a group of round steel pipes 11 arranged side by side. The outer diameter of the round steel pipes 11 is 2000mm, and the wall thickness is not less than 20mm; The minimum distance between them is not more than 600mm, and there are two notches on the semicircle of each round steel pipe 11 near the inner side of the pipe curtain 1, both of which are rectangular, so that the round steel pipes 11 perpendicular to the arrangement direction of the pipe curtain 1 The central axis of the center axis is arranged symmetrically, and the gap is set along the length direction of the round steel pipe 11. The width of the gap is 1/3-2/3 of the radius of the round steel pipe 11; each round steel pipe 11 is provided with an inner connecting plate 2 , the inner connecting plate 2 is arranged perpendicular to the central axis, the inner connecting plate 2 is arranged along the length direction of the round steel pipe 11, and the two sides of the inner connecting plate 2 are welded and fixed to the lower edges of the notches on both sides; the adjacent round steel pipe 11 An outer connecting plate 3 is arranged between them, and the outer connecting plate 3 is arranged along the length direction of the round steel pipe 11. Both the outer connecting plate 3 are steel plates with a thickness not less than 10mm;

Concrete 5 is poured between the round steel pipe 11 on the outside of the pipe curtain 1 and the inner connecting plate 2 and on the outer side of the outer connecting plate 3 on the outer side of the pipe curtain 1, and the thickness of the concrete 5 on the side of the outer connecting plate 3 is not less than the thickness Width: a grouting water-stop structure 4 is arranged between the outer side of the concrete 5 on one side of the outer connecting plate 3 and between adjacent round steel pipes 11 .

The construction method of the construction support structure of the new underground project closely pasting through the existing building of the utility model comprises the following steps:

Step 1. Determine the diameter, length, arrangement of the round steel pipes 11 and the distance between the round steel pipes 11 according to the design requirements and field survey results;

Step 2. Excavate the shaft, build the pipe jacking reaction wall and the working platform;

Step 3: Jacking round steel pipes 11 in layers to form a pipe curtain 1, excavating the earth in the pipes while jacking in, and grouting water-stopping between the steel pipes to form a grouting water-stopping structure 4;

Step 4, open a gap on the round steel pipe 11, and then weld the inner connecting plate 2 and the outer connecting plate 3;

Step 5, pouring concrete, curing to predetermined strength, and forming a construction support structure;

Step 6, under the protection of the construction support structure, carry out the earthwork excavation of the large section;

Step 7. With the layered excavation of the earthwork, the bottom plate 6 is constructed, and the round steel pipe 11 located on the inner connecting plate 2 close to the inner side of the pipe curtain 1 is cut off to form a complete construction structure, as shown in FIG. 2 .

The above-mentioned embodiments are only described to the preferred implementation of the utility model, and are not limited to the scope of the utility model. Various modifications and improvements made should fall within the scope of protection determined by the claims of the utility model.

Claims (6)

1. The construction support structure of the new underground project that closely passes through the existing building, which is characterized by: including the pipe curtain (1), the inner connecting plate (2), the outer connecting plate (3) and the grouting water-stop structure (4) ; The pipe curtain (1) is formed by a group of round steel pipes (11) arranged side by side, each round steel pipe (11) is provided with two notches on the semicircle on the inner side of the pipe curtain (1), and the two notches are Rectangular in shape, with the central axis of the round steel pipe (11) perpendicular to the arrangement direction of the pipe curtain (1) as the symmetrical axis, the gap is set along the length direction of the round steel pipe (11); each round steel pipe (11) An inner connecting plate (2) is arranged inside, and the inner connecting plate (2) is arranged along the length direction of the round steel pipe (11). An outer connection plate (3) is arranged between adjacent round steel pipes (11), and the outer connection plate (3) is arranged along the length direction of the round steel pipe (11). The lower edges of the two adjacent notches are fixed by welding; Concrete (5) is poured between the round steel pipe (11) on the outside of the pipe curtain (1) and the inner connecting plate (2) and on the outer side of the outer connecting plate (3) on the outer side of the pipe curtain (1). (3) A grouting water-stop structure (4) is provided on the outside of the concrete (5) on one side and between adjacent round steel pipes (11). 2. The construction support structure for a new underground project that closely passes through an existing building according to claim 1, characterized in that: the outer diameter of the round steel pipe (11) is 2000mm, and the wall thickness is not less than 20mm. 3. The construction support structure for a new underground project that closely passes through an existing building according to claim 1, wherein the minimum distance between adjacent round steel pipes (11) does not exceed 600 mm. 4. The construction support structure for a new underground project that closely passes through an existing building according to claim 1, wherein the width of the gap is 1/3-2/3 of the radius of the round steel pipe (11). 5. According to claim 1, the construction support structure for new underground projects to pass through existing buildings closely, is characterized in that: the inner connecting plate (2) and the outer connecting plate (3) are both of thickness not less than 10mm steel plate. 6. According to claim 1, the construction support structure for new underground projects to pass through existing buildings closely, is characterized in that: the thickness of the concrete (5) on the side of the outer connecting plate (3) is not less than that of the gap width.