CN112359858A

CN112359858A - Sinking well curtain structure and construction method

Info

Publication number: CN112359858A
Application number: CN202011409203.8A
Authority: CN
Inventors: 刘福林; 夏伟国; 申川
Original assignee: Tianjin Binghui Building Materials Technology Development Co ltd
Current assignee: Tianjin Binghui Building Materials Technology Development Co ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-02-12

Abstract

The invention discloses a sunk well curtain structure and a construction method, and belongs to the technical field of building construction. This structure accessible carries out the open caisson construction to the structure of the mode of not drainage construction of cutting earth to row's mud intracavity, sinks to impervious bed, forms closed stagnant water curtain, can reduce the water consumption in the work progress and the mud output in the work progress greatly, greatly reduced environmental pollution when practicing thrift the water source. The structure has low construction cost and low requirement on the construction area, and is more suitable for the construction of the environment with limited area. The inboard in-process that the structure sinks of barrel need not to carry out the operation of digging earth in this structure, consequently including the inboard island shape soil matrix that can form of barrel, play the effect of interior barrel supporting, compare with traditional open caisson construction structure, can remove the inboard bearing structure of a section of thick bamboo from, stable in structure and simple.

Description

Sinking well curtain structure and construction method

Technical Field

The invention belongs to the technical field of road construction, and particularly relates to a precast concrete pavement slab and a pavement construction method.

Background

The foundation pit is a soil pit excavated at the design position of the foundation according to the elevation of the foundation and the plane size of the foundation. The waterproof curtain is a general term of a waterproof series at the periphery of the engineering main body and is used for preventing or reducing continuous water stopping bodies which are adopted by underground water flowing into the foundation pit from the side wall of the foundation pit and the bottom of the foundation pit. The waterproof curtain of the foundation pit can be constructed by the SMW construction method, the construction needs enough construction working area, and the construction is difficult to complete in the construction environment with limited construction area. Like the transformation of a sunk-well type three-dimensional parking garage in an old community, the sunk-well type three-dimensional parking garage generally occupies a road surface with an area not more than 200 square meters, and the transformation available construction environment is limited.

If the traditional open caisson construction is directly adopted, in order to ensure that the environmental water flows into the foundation pit, the water level in the foundation pit is always higher than the environmental water level in the open caisson construction process, and the open caisson sinking operation is implemented by a method of pumping mud without draining water until the lower end of the open caisson sinks into a watertight layer (usually a clay layer). And after the open caisson is sunk to the elevation position, sealing the bottom of the open caisson and removing mud in the open caisson. The method can generate a large amount of slurry in the construction process, and needs a large amount of water sources, thereby causing the environmental pollution of the engineering and the waste of water resources.

For the reasons, no foundation pit construction method suitable for a limited construction area exists at present.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a precast concrete pavement slab and a pavement construction method for solving the problem of difficulty in construction of a foundation pit with a limited construction area at present.

The invention is realized in this way, and a sunk well curtain structure is characterized in that: including outer barrel and interior barrel, interior barrel is located the inboard of outer barrel, pass through the leg joint between outer barrel and the interior barrel, be the mud cavity of arranging between interior barrel and the outer barrel.

This structure accessible carries out the open caisson construction to the mode of not draining the water excavation construction to the row's mud intracavity, compares the method that traditional not drainage open caisson was under construction, and the water consumption in the work progress and the mud output in the work progress can be greatly reduced to this structure, greatly reduced environmental pollution when practicing thrift the water source. Compared with the traditional waterproof curtain structure, the structure has the advantages of low engineering construction cost and low requirement on the engineering construction area, and is more suitable for the environment construction with limited area. The inboard in-process that the structure sinks of barrel need not to carry out the operation of digging earth in this structure, consequently including the inboard island shape soil matrix that can form of barrel, play the effect of interior barrel supporting, compare with traditional open caisson construction structure, can remove the inboard bearing structure of a section of thick bamboo from, stable in structure and simple.

In the above technical solution, preferably, the inner cylinder and the bracket detachably fix the outer cylinder.

In the above technical solution, preferably, the bracket has two wing plates and a web plate connecting the two wing plates, and the two wing plates are respectively connected to the inner wall of the outer cylinder and the outer wall of the inner cylinder.

In the above technical scheme, preferably, the wing plate, the inner wall of the outer cylinder and the outer wall of the inner cylinder are provided with oblique insertion holes corresponding in position, and the oblique insertion rods are inserted into the oblique insertion holes.

Another object of the present invention is to provide a method for constructing a heavy curtain for a sunk well based on the above structure, which comprises the following steps:

1) manufacturing an outer cylinder and an inner cylinder segment on a manufacturing working surface, wherein the outer cylinder and the inner cylinder segment are connected through a support to form a segmented caisson curtain structure;

2) carrying out water filling and slurry discharging operation on a sludge discharging cavity between the outer cylinder and the inner cylinder, carrying out non-drainage sinking construction on the sectional type sunk well curtain structure, and reserving soil on the inner side of the inner cylinder;

3) sinking the sectional sunk well curtain structure section by section through the steps until the lowest end is sunk into an underground impervious layer;

4) pumping out all the muddy water in the sludge discharge cavity, and carrying out concrete bottom sealing treatment on the bottom of the sludge discharge cavity;

5) digging soil on the inner side of the inner cylinder;

6) and performing formal structure construction on the inner side of the sinking well curtain structure.

In the above technical solution, preferably, between step 5 and step 6, the fixing among the bracket, the inner cylinder and the outer cylinder is released, and the detachment process is performed on the bracket and the inner cylinder.

In the above technical solution, preferably, the support and the inner cylinder are removed from bottom to top in sequence in synchronization with the construction of the formal structure.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a side view of the connecting structure of the outer cylinder and the inner cylinder according to the present invention.

In the figure, 1, an outer cylinder body; 2. an inner cylinder; 3. a support; 3-1, wing plates; 3-2, a web; 4. a sludge discharge cavity.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention particularly provides a sunk well curtain structure and a construction method for solving the problem of difficulty in construction of a foundation pit with a limited construction area. To further illustrate the structure of the present invention, the following detailed description is made with reference to the accompanying drawings:

example one

Referring to fig. 1 and 2, a caisson curtain structure includes an outer cylinder 1 and an inner cylinder 2. Specifically, the inner cylinder 2 and the outer cylinder 1 are made of reinforced concrete, and the outer cylinder 1 is generally a cylinder or a square cylinder. The inner cylinder body 2 and the outer cylinder body 1 can be cast-in-place integral type or assembled by a plurality of precast slabs. Interior barrel 2 is located the inboard of outer barrel 1 is connected through support 3 between outer barrel 1 and the interior barrel 2, is the mud chamber 4 of arranging between interior barrel 2 and the outer barrel 1. The sinking well curtain structure is arranged on a manufacturing working surface of a foundation pit, and the structure is sunk by removing the soil body support in the mud discharging cavity 4.

After the structure sinks to the design elevation, that is, the lower end of the structure sinks to the impervious barrier, in order to enlarge the available space of the main structure inside the structure, the connection mode between the inner cylinder 2, the support 3 and the outer cylinder 1 is detachable, in this embodiment, specifically, the support 3 has two wing plates 3-1 and a web plate 3-2 connecting the two wing plates 3-1, and the wing plates 3-1 and the web plate 3-2 are welded steel plates. The two wing plates 3-1 are respectively connected with the inner wall of the outer cylinder body 1 and the outer wall of the inner cylinder body 2. Oblique insertion holes corresponding to the positions are formed in the wing plates 3-1, the inner wall of the outer barrel body 1 and the outer wall of the inner barrel body 2, and oblique insertion rods are inserted into the oblique insertion holes. The oblique jacks are transversely arranged at intervals and are crossed in the axis direction in a staggered manner, and the oblique jacks can be formed on the outer barrel body 1 and the inner barrel body 2 through pre-buried steel pipes. The oblique inserted link is a steel rod. The structure is stable in connection and simple and quick in disassembly and assembly.

Example two

The sinking well curtain construction method based on the structure comprises the following steps:

1) and segments of the outer cylinder body 1 and the inner cylinder body 2 are manufactured on the manufacturing working surface, and the segments of the outer cylinder body 1 and the segments of the inner cylinder body 2 are connected through a support 3 to form a segmented sinking well curtain structure. In this embodiment, the outer cylinder 1 is an integral reinforced concrete structure cast in situ on the foundation pit manufacturing working surface, and is a square cylinder. The inner cylinder 2 is a cylindrical structure formed by assembling a plurality of arc-shaped concrete precast slabs, and the arc-shaped concrete precast slabs can be fixed through the bracket 3 or detachable screws can be additionally arranged between the slabs. The outer cylinder 1 and the inner cylinder 2 have the same height and are constructed as a segment of a cylinder.

2) And (3) carrying out water filling and slurry discharging operation on a sludge discharging cavity 4 between the outer barrel 1 and the inner barrel 2, implementing non-drainage sinking construction on the sectional open caisson curtain structure, and reserving soil on the inner side of the inner barrel 2. Namely, high-pressure water is flushed into the mud discharging cavity 4 by using a high-pressure water pump and a water pipe to blow sand, and simultaneously, mud is pumped out by using a mud sucker. The construction method is the conventional known technology. And sequentially sinking the sectional sunk well curtain structure. During the sinking process of the structure, the soil on the inner side of the inner cylinder body 2 is not cleaned, and an island-shaped matrix is formed.

3) And sinking the sectional sunk well curtain structure section by section through the steps until the lowest end is sunk into an underground impervious layer to form the waterproof curtain. In the sinking process, the water level in the sludge discharge cavity 4 is ensured to be higher than the environmental water level in the soil layer all the time.

4) And pumping out all the muddy water in the mud discharging cavity 4, and carrying out concrete bottom sealing treatment on the bottom of the mud discharging cavity 4. Namely, a concrete layer is poured at the lowest part of the mud discharging cavity 4.

5) The soil on the inner side of the inner cylinder 2 is dug. The depth of the dug soil is not less than the back cover of the mud discharging cavity 4.

And after the steps are completed, performing formal structure construction on the inner side of the sinking well curtain structure. Formal structural construction generally includes back-capping, cushion-adding and other structural constructions.

In this embodiment, the specific steps are as follows:

6) the support 3, the inner cylinder 2 and the outer cylinder 1 are released from fixation, and the support 3 and the inner cylinder 2 are removed. Namely, the bracket 3 and the inner cylinder 2 are sequentially dismantled from bottom to top synchronously with the construction of the formal structure.

7) And finishing construction.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention, such as the inner cylinder being an elliptical cylinder, should be included in the protection scope of the present invention.

Claims

1. A sinking well curtain structure is characterized in that: including outer barrel (1) and interior barrel (2), interior barrel (2) are located the inboard of outer barrel (1), be connected through support (3) between outer barrel (1) and interior barrel (2), be row mud chamber (4) between interior barrel (2) and outer barrel (1).

2. The sinking well curtain structure of claim 1, wherein: the inner cylinder (2) and the support (3) are detachably fixed on the outer cylinder (1).

3. The sinking well curtain structure of claim 2, wherein: the support (3) is provided with two wing plates (3-1) and a web plate (3-2) for connecting the two wing plates (3-1), and the two wing plates (3-1) are respectively connected with the inner wall of the outer barrel body (1) and the outer wall of the inner barrel body (2).

4. The sinking well curtain structure of claim 3, wherein: the wing plate (3-1), the inner wall of the outer barrel (1) and the outer wall of the inner barrel (2) are provided with oblique insertion holes corresponding in position, and oblique insertion rods are inserted into the oblique insertion holes.

5. A sinking well curtain construction method based on the structure of any one of claims 1 to 4, characterized by comprising the following steps:

1) manufacturing sections of the outer cylinder (1) and the inner cylinder (2) on a manufacturing working surface, and connecting the sections of the outer cylinder (1) and the inner cylinder (2) through a bracket (3) to form a sectional type sunk well curtain structure;

2) carrying out water filling and slurry discharging operation on a sludge discharging cavity (4) between the outer cylinder (1) and the inner cylinder (2), carrying out non-drainage sinking construction on a segment type open caisson curtain structure, and reserving soil on the inner side of the inner cylinder (2);

4) pumping out all the muddy water in the sludge discharge cavity (4), and carrying out concrete bottom sealing treatment on the bottom of the sludge discharge cavity (4);

5) digging soil on the inner side of the inner cylinder body (2);

6. The construction method according to claim 5: the method is characterized in that: between the step 5 and the step 6, the support (3), the inner cylinder (2) and the outer cylinder (1) are released from the fixation, and the support (3) and the inner cylinder (2) are removed.

7. The construction method according to claim 6: the method is characterized in that: the support (3) and the inner cylinder (2) are sequentially dismantled from bottom to top in synchronization with the construction of the formal structure.