CN111411791A

CN111411791A - Existing foundation upper and lower column connecting structure and method for expanding underground space

Info

Publication number: CN111411791A
Application number: CN202010070459.4A
Authority: CN
Inventors: 高作平; 周剑波; 廖杰洪; 张畅; 吴博; 卢凌岳
Original assignee: Wuda Jucheng Structure Co ltd
Current assignee: Wuda Jucheng Structure Co ltd
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2020-07-14

Abstract

A connecting structure and a method for an existing foundation upper column and lower column for expanding underground space, wherein the connecting structure comprises an original structural column (1) and a basement steel pipe concrete column (2), and the original structural column and the basement steel pipe concrete column are connected through a longitudinal steel bar (3); the connection method comprises the following steps: firstly, drilling holes and planting bars on the periphery of an original structural column (1); the upper end of a longitudinal steel bar (3) is implanted into the original structural column (1), and after the basement steel tube concrete column (2) is manufactured, the lower end of the longitudinal steel bar (3) is welded with the newly-added basement steel tube concrete column (2); after the longitudinal steel bars (3) are bound with the stirrups, erecting a formwork and pouring concrete; after the beam slab of the basement is poured, the original structural column (1) and the original structural foundation (4) and the piles outside the range of the newly added steel pipe concrete column (2) of the basement are cut off, so that the whole stress is formed between the original structural column (1) at the upper part and the newly added steel pipe concrete column (2) of the basement. The implementation is convenient, and the connection and force transmission between the upper column and the lower column are reliable.

Description

Existing foundation upper and lower column connecting structure and method for expanding underground space

Technical Field

The invention relates to a connecting structure, in particular to an existing foundation upper and lower column connecting structure and method for expanding underground space.

Background

With the development of construction and society, people in cities have higher and higher demands for underground space in order to save land resources. However, many buildings in the long term are not constructed due to the environmental, economic and other conditions at the time. Nowadays, with the general improvement of living standard of people, the use space on the ground can not meet the increasing parking demand, so that the underground space needs to be expanded under the original existing building.

At present, in the construction process of expanding the underground space of a building by mainly replacing a pile foundation support, the connection between an original upper structure column and a newly-added basement column is often difficult in the construction technology. Meanwhile, due to the key nodes, if the common bar planting connection method is adopted, the construction is difficult at the bottom of the foundation, and great potential safety hazards exist.

Disclosure of Invention

The present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an existing foundation upper and lower column connection structure and method for expanding an underground space.

In order to achieve the purpose, the technical solution of the invention is as follows: the utility model provides a have based upper and lower post connection structure for expanding underground space, includes the former structure post of upper end and the basement steel core concrete column of lower part, connect through vertical reinforcing bar between former structure post and the basement steel core concrete column.

The upper end of the longitudinal steel bar is implanted into the original structural column, and the lower end of the longitudinal steel bar is welded with the basement steel pipe concrete column.

A method of connecting existing foundation upper and lower columns for expanding a subterranean space, comprising the steps of: firstly, drilling holes on the periphery of an original structural column for embedding steel bars, enabling longitudinal steel bars to penetrate through an original structural foundation, and reserving a certain anchoring length above and below the original structural foundation; implanting the upper end of the longitudinal steel bar into the original structural column, and welding the lower end of the longitudinal steel bar with the newly added basement steel pipe concrete column after the basement steel pipe concrete column is manufactured; step three, after the longitudinal steel bars are bound with the stirrups, erecting a formwork and pouring concrete; and step four, after the basement beam slab is poured, cutting off the original structure column and the original structure foundation and the pile outside the range of the newly added steel pipe concrete column of the basement, so that the whole stress is formed between the upper original structure column and the newly added steel pipe concrete column of the basement.

Compared with the prior art, the invention has the beneficial effects that:

the invention solves the problem of connection between the original structural column of the existing foundation and the newly-added basement steel pipe concrete column in the construction process of expanding the underground space of the building by mainly replacing the pile foundation with the pile foundation; and the method is convenient to implement and can ensure reliable connection and force transmission between the upper column and the lower column.

Drawings

Fig. 1 is a underpinning diagram of basement pile foundation in the invention.

FIG. 2 is a view showing a structure of connection between an upper column and a lower column of a conventional foundation according to the present invention.

Fig. 3 is a structure view of upper and lower columns after the basement beam slab is poured.

In the figure, an original structure column 1, a basement steel pipe concrete column 2, longitudinal steel bars 3, an original structure foundation 4, an underground first floor bottom plate 5, an underground second floor bottom plate 6 and a strong weathering rock stratum 7.

Detailed Description

The invention is described in further detail below with reference to the following description of the drawings and the detailed description.

Referring to fig. 1, a connection structure of an existing foundation upper column and a lower column for expanding an underground space is used for connecting an upper original structure column 1 with an independent foundation or a bearing platform with a newly added basement steel pipe concrete column 2 after a pile foundation is underpinned and the basement steel pipe concrete column 2 is poured in the construction process of expanding the underground space of a building; the concrete column comprises an original structural column 1 at the upper end and a basement steel tube concrete column 2 at the lower part, wherein the original structural column 1 and the basement steel tube concrete column 2 are connected through a longitudinal steel bar 3.

Referring to fig. 1, further, the upper end of the longitudinal steel bar 3 is embedded into the original structural column 1, and the lower end of the longitudinal steel bar 3 is welded with the basement steel pipe concrete column 2.

Referring to fig. 1 to 3, a method for connecting existing foundation upper and lower columns for expanding a subterranean space, comprising the steps of: firstly, drilling holes on the periphery of an original structure column 1 for embedding bars, enabling a longitudinal steel bar 3 to penetrate through an original structure foundation 4, and reserving a certain anchoring length on the original structure foundation 4, wherein the anchoring length is determined according to the anchoring length of the steel bar under longitudinal stress on a concrete specification. And step two, implanting the upper ends of the longitudinal steel bars 3 into the original structural column 1, and welding the lower ends of the longitudinal steel bars 3 with the newly added basement steel tube concrete column 2 after the basement steel tube concrete column 2 is manufactured. And step three, after the longitudinal steel bars 3 are bound with the stirrups, erecting a formwork and pouring concrete. And step four, after the basement beam slab is poured, cutting off the original structure foundation 4 and the piles outside the range of the original structure column 1 and the basement newly-added steel pipe concrete column 2, and enabling the upper original structure column 1 and the basement newly-added steel pipe concrete column 2 to form integral stress.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention relates, several simple deductions or substitutions may be made without departing from the spirit of the invention, and the above-mentioned structures should be considered as belonging to the protection scope of the invention.

Claims

1. The utility model provides a lower post connection structure on existing basis for expanding underground space which characterized in that: the concrete column comprises an original structure column (1) at the upper end and a basement steel tube concrete column (2) at the lower part, wherein the original structure column (1) and the basement steel tube concrete column (2) are connected through a longitudinal steel bar (3).

2. An existing foundation upper and lower column connection structure for expanding an underground space, according to claim 1, wherein: the upper end of the longitudinal steel bar (3) is implanted into the original structural column (1), and the lower end of the longitudinal steel bar (3) is welded with the basement steel pipe concrete column (2).

3. A method for connecting existing foundation upper and lower columns for expanding a subterranean space, comprising the steps of:

firstly, drilling holes on the periphery of an original structure column (1) for embedding bars, enabling a longitudinal steel bar (3) to penetrate through an original structure foundation (4), and reserving a certain anchoring length above and below the original structure foundation (4);

implanting the upper end of a longitudinal steel bar (3) into the original structural column (1), and welding the lower end of the longitudinal steel bar (3) with the newly added basement steel tube concrete column (2) after the basement steel tube concrete column (2) is manufactured;

step three, after the longitudinal steel bars (3) are bound with the stirrups, erecting a formwork and pouring concrete;

and step four, after the pouring of the beam slab of the basement is finished, cutting off the original structure column (1) and the original structure foundation (4) and piles outside the range of the newly added steel pipe concrete column (2) of the basement, so that the upper original structure column (1) and the newly added steel pipe concrete column (2) of the basement form integral stress.