CN114232639A

CN114232639A - Construction method for dismantling deep foundation pit support

Info

Publication number: CN114232639A
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: 2022-03-25
Anticipated expiration: 2041-12-10
Also published as: CN114232639B

Abstract

The invention provides a construction method for dismantling a deep foundation pit support, which comprises the following steps: after the foundation pit supporting system is constructed, constructing a crown beam, and an upper concrete corbel and an upper embedded part on the crown beam; constructing a concrete waist beam, a first concrete support, a lower corbel of the concrete support and an embedded part; installing a first steel pipe inclined strut and replacing a strut; excavating earthwork layer by layer from top to bottom, and constructing the rest concrete waist beam and the concrete horizontal support from top to bottom; constructing the lowest layer of the basic raft and the basement structure, installing basement side columns, and arranging lower corbels and embedded parts on the basement side columns; and (4) constructing the enclosing purlin, the upper bracket and the embedded part of the basement outer wall and the second section steel support replacing system to the upper part of the enclosing purlin and embedding the water stop steel plate. The invention has the advantages of ingenious design, simple structure and simple and convenient operation, and the bracket and the embedded part are arranged at the supporting beam and the crown beam of the designed supporting structure and the steel pipe inclined strut is installed to complete the first steel pipe inclined strut change and conversion.

Description

Construction method for dismantling deep foundation pit support

Technical Field

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

Background

In recent years, with the increasingly prosperous field of construction engineering in China, underground engineering is rapidly started, the construction area of basements is larger and larger, a main building is basically built in the middle area of the basements, and a support system is often collided with a wall column structure of the main building due to the fact that the shapes of foundation pits are not set in specifications. For a deep foundation pit with a small collision range, a main building cannot be independently constructed and can not be erected out of a basement structure due to the fact that design check calculation cannot be carried out through collision supports. The traditional method is that the lower chamber structure needs to be integrally constructed from a basic raft, a wall column structure and a floor slab structure to a support changing layer, and after the concrete strength at least reaches the design requirement, the support can be dismantled, the upper layer of support is dismantled after the basement structure is sequentially upwards sequentially done to the layer to be dismantled until the support is dismantled and the basement structure is completed, and then the main building structure is constructed. Therefore, the construction period is long, the capital turnover rate is low, and the economic cost of the investor is seriously influenced.

Disclosure of Invention

In view of this, the present invention provides a construction method for dismantling a deep foundation pit support, which aims to solve the above-mentioned shortcomings in the background art.

In one aspect, the invention provides a construction method for dismantling a deep foundation pit support,

firstly, the design of the foundation pit ensures that the first support and the crown beam on the fender pile have a certain height difference.

Secondly, after the deep foundation pit support structure is constructed, arranging concrete lower corbels and lower embedded parts at the intersection nodes of the first concrete horizontal support beam and the lattice columns at certain intervals, arranging concrete upper corbels and upper embedded parts at the corresponding positions of crown beams on the foundation pit support structure, and installing steel pipe inclined struts.

And then, arranging lower bracket and lower embedded part on the side column and embedded short column of the constructed underground layer of the basement, arranging enclosing purlin and upper bracket and upper embedded part on the corresponding basement outer wall, and installing the section steel support to change the support. Meanwhile, a steel pipe opposite support and anchoring plate combination support changing form is arranged before the support colliding with the main building is dismantled. The three support replacing systems become a prerequisite for the deep foundation pit support to be dismantled after reaching the target, and the support colliding with the wall column of the main building can be dismantled after the support is formed.

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

the method comprises the following steps: after the foundation pit supporting system is constructed, constructing a crown beam, and an upper concrete corbel and an upper embedded part on the crown beam;

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

step three: installing a first steel pipe inclined strut and replacing a strut;

step four: excavating earthwork layer by layer from top to bottom, and constructing the rest concrete waist beam and the concrete horizontal support from top to bottom;

step five: constructing the lowest layer of the basic raft and the basement structure, installing basement side columns, and arranging lower corbels 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 section steel support replacing system to the upper part of the enclosing purlin, and embedding a water stop steel plate;

step seven: installing a second channel of section steel inclined strut replacement strut;

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

step nine: removing a supporting structure unit which partially collides with the vertical structure of the main building wall column;

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

The steel pipe diagonal bracing device has the advantages of ingenious design, simple structure and simplicity and convenience in operation, and the replacement and the bracing conversion of the first steel pipe diagonal bracing are completed by arranging the corbels and the embedded parts at the supporting beams and the crown beams of the designed and braced self structures and installing the steel pipe diagonal bracing. And a second support replacing conversion is completed by arranging a surrounding purlin and a bracket on the basement floor structure and the outer wall, and arranging a short embedded column and a bracket on each side column and then installing a profile steel inclined support. And arranging steel pipe opposite supports and anchoring plates beside the supports collided with the main building to complete the third support change conversion. The problem that a main building cannot be independently constructed and moved out of a basement structure due to the fact that design checking calculation cannot be carried out through collision support and cannot be disassembled 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 invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a flowchart of a construction method for dismantling a deep foundation pit support according to an embodiment of the present invention;

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

FIG. 3 is a first structural diagram provided by an embodiment of the present invention;

FIG. 4 is a second block diagram provided in accordance with an embodiment of the present invention;

FIG. 5 is a third structural diagram provided in accordance with an embodiment of the present invention;

fig. 6 is a fourth structural diagram provided in the embodiment of the present invention.

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 the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The embodiment provides a construction method for dismantling a deep foundation pit support, and firstly, the foundation pit design enables a certain height difference between a first support and a top beam on a fender pile.

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

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

step three: installing a first steel pipe inclined strut and replacing a strut;

This embodiment design benefit, simple structure, it is easy and simple to handle, support a supporting beam and the crown beam department of self structure through utilizing the design to strut sets up the bracket and buries the piece and install the steel pipe bracing, accomplishes the conversion of trading of first steel pipe bracing. And a second support replacing conversion is completed by arranging a surrounding purlin and a bracket on the basement floor structure and the outer wall, and arranging a short embedded column and a bracket on each side column and then installing a profile steel inclined support. And arranging steel pipe opposite supports and anchoring plates beside the supports collided with the main building to complete the third support change conversion. The problem that a main building cannot be independently constructed and moved out of a basement structure due to the fact that design checking calculation cannot be carried out through collision support and cannot be disassembled is solved.

In the embodiment shown in fig. 2 to 6, after the foundation pit supporting system 7 is constructed, the crown beam 1 and the concrete upper corbel 201 and the upper embedded part 203 on the crown beam are constructed. The construction concrete wale 3, the first concrete support 4, the lower corbel 202 of the concrete support and the embedded part 204. And installing a first steel pipe inclined strut replacing strut 205. And excavating earthwork layer by layer from top to bottom, and constructing the residual concrete waist beam 3 and the concrete horizontal support 4 from top to bottom. Constructing a foundation raft 11 and the lowest layer 10 of a basement structure, constructing side columns of the basement, an embedded short column 9, lower brackets 804 on the side columns and embedded pieces 802. The basement outer wall 12, the enclosing purlin of the second section steel support replacing system, the upper bracket 803 and the embedded piece 804 are constructed to the upper part of the enclosing purlin, and a water stop steel plate is embedded. And installing a second channel of steel diagonal bracing change support 805. And installing third steel pipe opposite-supporting

structures

1401 and 1402 to finish final support replacement. And removing the supporting structure unit which partially collides with the vertical structure of the wall column of the main building. The basement structure protrudes from the main building structure and is separately applied to the landing.

Referring to fig. 2, a first support exchanging system 2 is arranged on the crown beam 1 (the first support exchanging 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), and a horizontal support 4, a member 13 where a main building wall column and a support collide with each other, and a third support exchanging system 14 (steel pipe supports 1401 and 1402) are arranged on the crown beam 1.

Referring to fig. 3, in a first step of the construction method for supporting and then dismantling a deep foundation pit, a first support replacing system 2 is arranged on a crown beam 1 (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), a fender post 7 is arranged at the lower part of the crown beam 1, a wale 3 is connected with the fender post 7, a first support 4 is connected with the wale 3, and an angle steel lattice column 5 and a column post 6 are arranged at the lower side of the first support 4.

Referring to fig. 4, a first step of the construction method for dismantling the deep foundation pit support according to the present embodiment includes a crown beam 1, 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, a lower bracket embedded part 204, and a steel pipe diagonal support 205), a wale 3, a first support 4, an angle steel lattice column 5, a vertical column pile 6, and a fender pile 7.

Referring to fig. 5, a third process of the construction method for dismantling the deep foundation pit support 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 inclined strut 205), a waist beam 3, a horizontal support 4, an angle steel lattice column 5, a vertical column pile 6, a fender post 7, a second support changing system 8 (the support changing 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 lowest basement layer 10, a foundation raft 11 and a basement outer wall 12.

Referring to fig. 6, a fourth process of the construction method for dismantling the deep foundation pit support 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 support 205), a waist beam 3, a horizontal support 4, an angle steel lattice column 5, a vertical column pile 6, a fender pile 7, a second support changing system 2 (the support changing 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 profile steel diagonal support 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 support-changing system with the conflict between local demolition and the main building is finished, the main building structure is constructed until the pin layer is reached. The commodity house can reach the target of coming into the market quickly, and the capital of the construction unit can be returned quickly, so that the economic benefit is remarkable.

As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims

1. A construction method for dismantling a deep foundation pit support is characterized by comprising the following steps:

step three: installing a first steel pipe inclined strut and replacing a strut;