CN114232639B

CN114232639B - Construction method for post-dismantling of deep foundation pit support

Info

Publication number: CN114232639B
Application number: CN202111507552.8A
Authority: CN
Inventors: 李庆辉; 焦玉俊; 黎明中
Original assignee: China First Metallurgical Group Co Ltd
Current assignee: China First Metallurgical Group Co Ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2023-08-25
Anticipated expiration: 2041-12-10
Also published as: CN114232639A

Abstract

The application provides a construction method for post-dismantling of a deep foundation pit support, which comprises the following steps: after the foundation pit supporting system is constructed, constructing a concrete upper bracket and an upper embedded part on a crown Liang Jiguan beam; constructing a concrete waist beam, a first concrete support, a lower bracket of the concrete support and an embedded part; installing a first steel pipe diagonal bracing and replacing support; the soil is excavated layer by layer from top to bottom, and the rest concrete waist beam and the concrete horizontal support are constructed from top to bottom; constructing a foundation raft and the lowest layer of a basement structure, installing basement side columns, and arranging lower brackets and embedded parts on the basement side columns; and (3) performing construction of the surrounding purlin, the upper bracket and the embedded part of the basement outer wall and the second channel steel section support changing system until the upper part of the surrounding purlin is constructed, and embedding a water stop steel plate. The application has ingenious design, simple structure and simple and convenient operation, and the bracket and the embedded part are arranged at the support beam and the crown beam which are designed to support the structure of the application, and the steel pipe diagonal bracing is installed, so that the conversion of the first steel pipe diagonal bracing is completed.

Description

Construction method for post-dismantling of deep foundation pit support

Technical Field

The application relates to the technical field of building construction, in particular to a construction method for post-dismantling of a deep foundation pit support.

Background

In recent years, along with the increasing popularity of the field of construction engineering in China, the underground engineering is rapidly promoted, the construction area of a basement is larger and larger, a main building is basically built in the middle area of the basement, and a supporting system is often in collision with a wall column structure of the main building due to the fact that the shape of a foundation pit is not standard. For deep foundation pits with a small collision range, the foundation pit cannot be dismantled due to the fact that design checking calculation is not carried out through collision supports, and a main building cannot stand out of a basement structure to be independently applied. The traditional method is that the lower room structure needs to be integrally constructed from the foundation raft, the wall column structure and the floor slab structure to the support changing layer, the support can be removed only after the concrete strength at least meets the design requirement, the basement structure is sequentially and upwards removed from the upper layer of support after the support is removed to the layer changing, until the support is removed and the basement structure is completed, and then the main building structure is constructed. Thus, the construction period is long, the fund turnover rate is low, and the economic cost of the investor is seriously influenced.

Disclosure of Invention

In view of the above, the present application proposes a construction method for post-dismantling of deep foundation pit supports, which aims to solve the above-mentioned drawbacks in the background art.

In one aspect, the application provides a construction method for post-dismantling a deep foundation pit support,

first, the foundation pit design makes the first support have certain difference in height with the crown beam on the fender post.

And secondly, after the deep foundation pit support structure is constructed, arranging concrete lower brackets and lower embedded parts at the intersection joint of the first concrete horizontal supporting beam and the lattice columns at a certain interval, arranging concrete upper brackets and upper embedded parts at the corresponding positions of the crown beams on the foundation pit support structure, and installing steel pipe diagonal braces.

And then, a column lower bracket and a lower embedded part are additionally arranged on a side column and an embedded short column of a layer of the basement which is constructed, an enclosing purlin and a supporting upper bracket and an upper embedded part are additionally arranged on the outer wall of the basement correspondingly, and a section steel support is arranged for support replacement. Meanwhile, a steel pipe opposite support and an anchoring plate combined support changing form is arranged before the support which collides with the main building is removed. The three support changing systems become preconditions for the deep foundation pit support to be disassembled after the deep foundation pit support is formed, and the support which is in collision with the main building wall column can be disassembled after the deep foundation pit support is formed.

The construction method for post-dismantling of the deep foundation pit support comprises the following steps:

step one: after the foundation pit supporting system is constructed, constructing a concrete upper bracket and an upper embedded part on a crown Liang Jiguan beam;

step two: constructing a concrete waist beam, a first concrete support, a lower bracket of the concrete support and an embedded part 2;

step three: installing a first steel pipe diagonal bracing and replacing support;

step four: the soil is excavated layer by layer from top to bottom, and the rest concrete waist beam and the concrete horizontal support are constructed from top to bottom;

step five: constructing a foundation raft and the lowest layer of a basement structure, installing basement side columns, and arranging lower brackets and embedded parts on the basement side columns;

step six: constructing an enclosing purlin, an upper bracket and an embedded part of a basement outer wall and a second channel steel support replacing system, constructing the enclosing purlin to the upper part of the enclosing purlin, and embedding a water stop steel plate;

step seven: installing a second section steel diagonal brace for replacing;

step eight: installing a third steel pipe opposite supporting structure to finish final support replacement;

step nine: removing the supporting structure unit which is locally collided with the vertical structure of the main building wall column;

step ten: the basement structure protrudes from the main building structure and is applied separately to the access pin layer.

The application has the beneficial effects that the application has ingenious design, simple structure and simple and convenient operation, and the bracket and embedded part are arranged at the support beam and the crown beam which are designed to support the structure of the application, and the steel pipe diagonal bracing is installed, so that the conversion of the first steel pipe diagonal bracing is completed. The surrounding purlin and the bracket are arranged by utilizing the basement floor structure and the outer wall, and the profile steel diagonal bracing is arranged after the side columns are provided with the embedded short columns and the bracket, so that the second channel bracing changing conversion is completed. And arranging a steel pipe opposite support and an anchoring plate beside the support where the main building collides to finish the third support changing conversion. The problem that the main building cannot stand out the basement structure to be independently constructed due to the fact that design checking calculation cannot be dismantled through collision support is solved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a flow chart of a construction method for post-dismantling of a deep foundation pit support provided by an embodiment of the application;

FIG. 2 is a plan view of a construction method for post-dismantling a deep foundation pit support according to an embodiment of the present application;

FIG. 3 is a first block diagram according to an embodiment of the present application;

FIG. 4 is a second block diagram provided by an embodiment of the present application;

FIG. 5 is a third block diagram according to an embodiment of the present application;

fig. 6 is a fourth block diagram according to an embodiment of the present application.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

The embodiment provides a construction method for post-dismantling of a deep foundation pit support, firstly, the foundation pit design enables a crown beam on a first support and a guard pile to have a certain height difference.

Referring to fig. 1, the construction method for post-dismantling of the deep foundation pit support includes:

step two: constructing a concrete waist beam, a first concrete support, a lower bracket of the concrete support and an embedded part;

step seven: installing a second section steel diagonal brace for replacing;

The support beam and crown beam of the self-supporting structure are provided with brackets and embedded parts, and steel pipe diagonal braces are installed, so that the support changing conversion of the first steel pipe diagonal braces is completed. The surrounding purlin and the bracket are arranged by utilizing the basement floor structure and the outer wall, and the profile steel diagonal bracing is arranged after the side columns are provided with the embedded short columns and the bracket, so that the second channel bracing changing conversion is completed. And arranging a steel pipe opposite support and an anchoring plate beside the support where the main building collides to finish the third support changing conversion. The problem that the main building cannot stand out the basement structure to be independently constructed due to the fact that design checking calculation cannot be dismantled through collision support is solved.

In the embodiment, after the foundation pit supporting system 7 is constructed, the crown beam 1, the concrete upper bracket 201 on the crown beam and the upper embedded part 203 are constructed. The concrete waist beam 3, the first concrete support 4, the lower bracket 202 of the concrete support and the embedded part 204 are constructed. A first steel pipe diagonal bracing 205 is installed. The soil is excavated layer by layer from top to bottom, the rest concrete waist beam 3 and the concrete horizontal support 4 are applied from top to bottom. The foundation raft 11 and the lowest layer 10 of the basement structure are constructed, and basement side columns, embedded short columns 9, lower brackets 804 on the side columns and embedded parts 802 are constructed. The surrounding purlin of the basement outer wall 12 and the second channel steel section support replacing system, the upper bracket 803 and the embedded part 804 are constructed to the upper part of the surrounding purlin, and water-stopping steel plates are embedded. And installing a second section steel diagonal bracing and replacing 805. And installing third steel pipe opposite supporting structures 1401 and 1402 to finish final support replacement. And removing the supporting structure unit which is locally collided with the vertical structure of the main building wall column. The basement structure protrudes from the main building structure and is applied separately to the access pin layer.

Referring to fig. 2, a first bracing system 2 (the first bracing system 2 is composed of an upper bracket 201, a lower bracket 202, an upper bracket embedded part 203 and a lower bracket embedded part 204) is arranged on a crown beam 1, and a horizontal support 4, a member 13 of a main building wall column, which is in collision with the support, and a third bracing system 14 (steel pipe supports 1401 and 1402) are arranged on the crown beam 1.

Referring to fig. 3, in the first construction method for post-dismantling of deep foundation pit supports of this embodiment, a first support replacing system 2 (the support replacing system 2 is composed of an upper bracket 201, a lower bracket 202, an upper bracket embedded part 203 and a lower bracket embedded part 204) is provided on a crown beam 1, a guard post 7 is provided on a lower portion of the crown beam 1, a waist beam 3 is connected with the guard post 7, a first support 4 is connected with the waist beam 3, and an angle steel lattice column 5 and a column pile 6 are provided on a lower side of the first support 4.

Referring to fig. 4, a first construction method for post-dismantling a deep foundation pit support of the present embodiment includes a crown beam 1, a first support-changing system 2 (the support-changing system 2 is composed of an upper bracket 201, a lower bracket 202, an upper bracket embedded part 203, a lower bracket embedded part 204, and a steel pipe diagonal brace 205), a waist beam 3, a first support 4, an angle steel lattice column 5, a column pile 6, and a fender pile 7.

Referring to fig. 5, a construction method for post-dismantling a deep foundation pit support includes a crown beam 1, a first support-exchanging system 2 (the support-exchanging system 2 is composed of an upper bracket 201, a lower bracket 202, an upper bracket embedded part 203, a lower bracket embedded part 204 and a steel pipe diagonal brace 205), a waist beam 3, a horizontal support 4, an angle steel lattice column 5, a column pile 6, a guard pile 7, a second support-exchanging system 8 (the support-exchanging system 8 is composed of an upper bracket 801, a lower bracket 802, an upper bracket embedded part 803 and a lower bracket embedded part 804), a basement side column 9, a basement bottom layer 10, a foundation raft 11 and a basement outer wall 12.

Referring to fig. 6, a construction method for post-dismantling a deep foundation pit support includes a crown beam 1, a first support-exchanging system 2 (the support-exchanging system 2 is composed of an upper bracket 201, a lower bracket 202, an upper bracket embedded part 203, a lower bracket embedded part 204 and a steel pipe diagonal brace 205), a waist beam 3, a horizontal support 4, an angle steel lattice column 5, a column pile 6, a guard pile 7, a second support-exchanging system 2 (the support-exchanging system 8 is composed of an upper bracket 801, a lower bracket 802, an upper bracket embedded part 803, a lower bracket embedded part 804 and a steel diagonal brace 805), a basement side column 9, a basement bottom layer 10, a foundation raft 11 and a basement outer wall 12.

By adopting the embodiment, after the construction of the local conflict support changing system with the main building is dismantled, the main building structure is constructed to reach the pin layer. The commodity house can reach the aim of marketing faster, the construction unit funds can be returned quickly, and the economic benefit is obvious.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.

Claims

1. The construction method for post-dismantling of the deep foundation pit support is characterized by comprising the following steps of:

step two: constructing a concrete waist beam, a first concrete support, a lower bracket of the concrete support and a lower embedded part;

step four: the soil is excavated layer by layer from top to bottom, and the rest concrete waist beam and the concrete horizontal support are constructed from top to bottom; an upper bracket, a lower bracket, an upper embedded part, a lower embedded part and a first steel pipe diagonal brace arranged on the crown beam form a first supporting system;

step five: constructing the lowest layer of foundation raft and basement structure, installing basement side column, and installing the foundation raft and basement side column

A lower bracket and an embedded part are arranged on the upper part;

step six: the construction of the surrounding purlin, the upper bracket and the embedded part of the basement outer wall and the second channel steel support replacing system is carried out until the surrounding is constructed

The upper part of the purlin is embedded with a water stop steel plate;

step seven: installing a second section steel diagonal brace for replacing; the upper bracket, the lower bracket, the upper embedded part, the lower embedded part and the second steel pipe diagonal bracing on the foundation raft form a second supporting system;

step eight: installing a third steel pipe opposite supporting structure to finish final support replacement; the third steel pipe opposite supporting structure is arranged on the crown beam in two, and a third supporting system is formed;