阅读说明：本技术 半外包半埋入式钢柱脚结构及其施工方法 (Half-outer-wrapping half-embedded steel column base structure and construction method thereof ) 是由 毕成 张志达 国忠岩 于 2019-11-29 设计创作，主要内容包括：本发明提供了一种半外包半埋入式钢柱脚结构及其施工方法。半外包半埋入式钢柱脚结构包括筏板基础、钢结构柱及外包基础柱,筏板基础上设有凹坑,钢结构柱的柱脚固定于凹坑中,外包基础柱包覆形成于钢结构柱的柱脚外周面上,外包基础柱下端固定于凹坑中且上端延伸至筏板基础上表面上方。施工方法用于建造上述半外包半埋入式钢柱脚结构。本发明能有效解决现有技术中上部钢柱巨大的弯矩传递给基础以及如何安全传递钢柱脚底部水平力的问题；且本发明具有简便施工、给地下管线的铺设提供空间及节省造价的优点。(The invention provides a half-outer-wrapping half-embedded steel column base structure and a construction method thereof. Half outer package half-buried formula steel column foot structure includes raft foundation, steel structure post and outsourcing foundation column, is equipped with the pit on the raft foundation, and in the column base of steel structure post was fixed in the pit, the outsourcing foundation column cladding formed on the column base outer peripheral face of steel structure post, and outsourcing foundation column lower extreme is fixed in the pit and the upper end extends to raft foundation upper surface top. The construction method is used for constructing the half-externally-wrapped and half-embedded steel column base structure. The invention can effectively solve the problems that the huge bending moment of the upper steel column is transferred to the foundation and how to safely transfer the horizontal force at the bottom of the steel column base in the prior art; the invention has the advantages of simple construction, providing space for laying underground pipelines and saving construction cost.)

1. The utility model provides a half outer half embedded steel column foot structure, its characterized in that, half outer half embedded steel column foot structure includes raft foundation, steel structure post and outsourcing foundation column, be equipped with the pit on the raft foundation, the column foot of steel structure post is fixed in the pit, outsourcing foundation column cladding form in on the outer peripheral face of the column foot of steel structure post, the lower extreme of outsourcing foundation column is fixed in the pit, the upper end of outsourcing foundation column extends to the top of the upper surface on raft foundation.

2. The semi-encased semi-embedded steel column base structure of claim 1, wherein the steel column comprises a bottom plate and a column body, the lower end of the column body is connected with the bottom plate, concrete is poured into the column body, a plurality of studs are arranged on the outer surface of the column body in the area covered by the encased foundation column, and one end of each stud protruding out of the outer surface of the column body is embedded into the encased foundation column.

3. The semi-encased semi-embedded steel column base structure of claim 2, wherein the plurality of studs are divided into a plurality of groups from top to bottom, the distance between two adjacent groups is less than or equal to 200mm, and each group comprises 4 to 20 studs arranged at intervals along the circumferential direction of the column body.

4. The semi-externally-wrapped and semi-embedded steel column foot structure according to claim 2, wherein a connecting member is fixedly arranged on the bottom surface of the pit, the connecting member comprises an embedded plate, a plurality of anchor bars and a plurality of screw rods penetrating through the embedded plate, each anchor bar is arranged below the embedded plate and perpendicular to the embedded plate, the upper end of each anchor bar is fixedly connected with the embedded plate, each anchor bar and the embedded plate are embedded in the raft foundation, the upper surface of the embedded plate is flush with the bottom surface of the pit, the lower end of each screw rod penetrates through the embedded plate and is embedded in the raft foundation, the upper end of each screw rod extends upwards to protrude out of the bottom surface of the pit, and the upper end of each screw rod penetrates through the bottom plate in the state that the column foot of the steel structure column is fixed in the pit, and the bottom plate is fixedly connected with the embedded plate.

5. The semi-externally-wrapped and semi-embedded steel column base structure according to any one of claims 1 to 4, wherein the externally-wrapped foundation column is a reinforced concrete structure cast and wrapped on the outer peripheral surface of the column base of the steel structure column, and the raft foundation is a raft foundation formed by casting reinforced concrete.

6. A construction method of a half-encased half-embedded steel column base structure, which is characterized by being capable of being used for building the half-encased half-embedded steel column base structure according to any one of claims 1 to 5, and comprising the following steps:

constructing a raft foundation, and presetting a pit on the upper surface of the raft foundation;

building a steel structure column, and fixing the lower end of the steel structure column in the pit;

and constructing and forming an outer wrapping foundation column on the outer surface of the column base of the steel structure column.

7. The construction method of the semi-encased and semi-embedded steel column foot structure according to claim 6, wherein the constructing of the raft foundation with the pre-pit formed in the upper surface of the raft foundation comprises:

strapping and laying raft reinforcing steel bars, outer-wrapped foundation reinforcing steel bars, connecting members and pit molds, enabling the upper surfaces of the pre-embedded plates of the connecting members to be in contact with the lower surfaces of the pit molds in a fitting manner, enabling the lower ends of the outer-wrapped foundation reinforcing steel bars to penetrate through the pit molds and extend downwards to the lower sides of the pit molds, pouring concrete, enabling the lower ends of the outer-wrapped foundation reinforcing steel bars, the lower ends of the screw rods of the connecting members, the pre-embedded plates of the connecting members and the anchor bars of the connecting members to be embedded in the concrete, dismantling the pit molds after the concrete is initially set, maintaining the concrete, and completing the construction of the raft foundation.

8. The method of constructing a semi-encased, semi-embedded steel socle structure of claim 7, wherein the step of constructing a steel structural column such that a lower end of the steel structural column is secured in the pit comprises:

placing the column feet of the steel structure column into the pits, enabling the screw rods to penetrate through the bottom plate of the steel structure column, attaching the bottom plate to the embedded plate, and welding and fixing the bottom plate and the embedded plate; according to the preset height of the outer-coated foundation column, a plurality of studs can be arranged on the outer surface of the steel structure column body in the area coated by the outer-coated foundation column in a welding mode, concrete is poured into the steel structure column, and the steel structure column is built.

9. The method of constructing a semi-encased and semi-embedded steel column base structure of claim 8, wherein the step of constructing the encased foundation column on the outer surface of the steel column base comprises:

and arranging an outer packing foundation mold outside the column foot of the steel structure column, pouring concrete between the outer packing foundation mold and the steel structure column, dismantling the outer packing foundation mold after the concrete is initially set, curing the concrete, and finishing the construction of the outer packing foundation column.

10. The construction method of the semi-externally-wrapped and semi-embedded steel column base structure according to claim 8, wherein before the step of arranging an externally-wrapped foundation mold on the outer side of the column base of the steel column, the construction method further comprises the following steps:

arranging raft plate supplement steel bars in the pits, and welding and fixing the raft plate supplement steel bars and the raft plate steel bars.

Technical Field

The invention relates to the technical field of constructional engineering, in particular to a half-externally-wrapped and half-embedded steel column base structure and a construction method thereof.

Background

The connection between the steel column base and the foundation of the existing high-rise steel frame building generally adopts an external wrapping type or embedded type rigid column base connection mode.

To the high-rise steel frame building that does not have the basement, the connection of traditional outer cladding formula steel column foot and raft foundation faces two problems: 1. the bending-resistant connection structure between the steel column foot and the raft foundation requires arranging complex steel stiffening ribs on the bottom plate; 2. when the raft foundation and the externally-coated steel column base short column cannot be poured once for construction, potential safety hazards exist in the transmission of large horizontal force of the steel column base. If adopt traditional formula steel column foot of buryying and raft foundation to be connected, also face two problems: 1. the cost is wasted if the raft foundation is too thick; 2. the raft foundation is too shallow, which is not favorable for laying underground pipelines.

Disclosure of Invention

The invention aims to provide a semi-externally-wrapped and semi-embedded steel column base structure and a construction method thereof, which can meet the installation requirement of a steel structure column, and can provide enough space for laying underground pipelines while effectively reducing the thickness of a raft foundation.

In order to achieve the above purpose, the present invention provides a semi-externally-covered and semi-embedded steel column base structure, wherein the semi-externally-covered and semi-embedded steel column base structure includes a raft foundation, a steel structure column and an externally-covered foundation column, a pit is formed on the raft foundation, a column base of the steel structure column is fixed in the pit, the externally-covered foundation column is formed on an outer circumferential surface of the column base of the steel structure column in a wrapping manner, a lower end of the externally-covered foundation column is fixed in the pit, and an upper end of the externally-covered foundation column extends above an upper surface of the raft foundation.

The semi-externally-coated semi-embedded steel column base structure comprises a base plate and a column body, wherein the lower end of the column body is connected with the base plate, concrete is poured into the column body, a plurality of studs are arranged in an area, coated by the externally-coated foundation column, on the outer surface of the column body, and one end, protruding out of the outer surface of the column body, of each stud is embedded into the externally-coated foundation column.

The above-mentioned half-encased half-embedded steel column base structure, wherein the plurality of studs are divided into a plurality of groups from top to bottom, the distance between two adjacent groups is less than or equal to 200mm, and each group includes 4 to 20 studs arranged at intervals along the circumferential direction of the column.

The half-encased and half-embedded steel column base structure comprises a concave pit, a connecting component and a connecting component, wherein the connecting component is fixedly arranged on the bottom surface of the concave pit, the connecting component comprises an embedded plate, a plurality of anchor bars and a plurality of screw rods penetrating through the embedded plate, each anchor bar is arranged below the embedded plate and is vertical to the embedded plate, the upper end of each anchor bar is fixedly connected with the embedded plate, each anchor bar and the embedded plate are embedded in the raft foundation, the upper surface of the pre-embedded plate is flush with the bottom surface of the pit, the lower end of each screw rod penetrates through the pre-embedded plate and is embedded in the raft foundation, the upper end of each screw rod extends upwards to protrude out of the bottom surface of the pit, and under the state that the column feet of the steel structure column are fixed in the pits, the upper end of each screw rod penetrates through the bottom plate, and the bottom plate is fixedly connected with the embedded plate.

The semi-externally-coated and semi-embedded steel column base structure comprises a semi-externally-coated and semi-embedded steel column base, wherein the externally-coated foundation column is a reinforced concrete structure which is cast and coated on the outer peripheral surface of the column base of the steel column, and the raft foundation is formed by pouring reinforced concrete.

In order to achieve the above object, the present invention further provides a construction method of a half-encased half-embedded steel column base structure, wherein the construction method of the half-encased half-embedded steel column base structure can be used for constructing the half-encased half-embedded steel column base structure as described above, and the construction method of the half-encased half-embedded steel column base structure comprises:

constructing a raft foundation, and presetting a pit on the upper surface of the raft foundation;

building a steel structure column, and fixing the lower end of the steel structure column in the pit;

and constructing and forming an outer wrapping foundation column on the outer surface of the column base of the steel structure column.

The above construction method of the half-encased and half-embedded steel column foot structure, wherein the raft foundation is built, and the upper surface of the raft foundation is pre-provided with the pits, comprises:

strapping and laying raft reinforcing steel bars, outer-wrapped foundation reinforcing steel bars, connecting members and pit molds, enabling the upper surfaces of the pre-embedded plates of the connecting members to be in contact with the lower surfaces of the pit molds in a fitting manner, enabling the lower ends of the outer-wrapped foundation reinforcing steel bars to penetrate through the pit molds and extend downwards to the lower sides of the pit molds, pouring concrete, enabling the lower ends of the outer-wrapped foundation reinforcing steel bars, the lower ends of the screw rods of the connecting members, the pre-embedded plates of the connecting members and the anchor bars of the connecting members to be embedded in the concrete, dismantling the pit molds after the concrete is initially set, maintaining the concrete, and completing the construction of the raft foundation.

The construction method of the half-encased and half-embedded steel column base structure as described above, wherein the step of constructing the steel structural column so that the lower end of the steel structural column is fixed in the pit, comprises:

placing the column feet of the steel structure column into the pits, enabling the screw rods to penetrate through the bottom plate of the steel structure column, attaching the bottom plate to the embedded plate, and welding and fixing the bottom plate and the embedded plate; according to the preset height of the outer-coated foundation column, a plurality of studs can be arranged on the outer surface of the steel structure column body in the area coated by the outer-coated foundation column in a welding mode, concrete is poured into the steel structure column, and the steel structure column is built.

The construction method of the semi-externally-wrapped and semi-embedded steel column base structure, wherein the step of constructing and forming the externally-wrapped foundation column on the outer surface of the column base of the steel column, comprises the following steps:

and arranging an outer packing foundation mold outside the column foot of the steel structure column, pouring concrete between the outer packing foundation mold and the steel structure column, dismantling the outer packing foundation mold after the concrete is initially set, curing the concrete, and finishing the construction of the outer packing foundation column.

The construction method of the half-externally-coated and half-embedded steel column base structure further comprises, before the step of arranging an externally-coated foundation mold on the outer side of the column base of the steel column:

arranging raft plate supplement steel bars in the pits, and welding and fixing the raft plate supplement steel bars and the raft plate steel bars.

Compared with the prior art, the invention has the following advantages:

according to the construction method of the semi-externally-coated semi-embedded steel column base structure and the semi-externally-coated semi-embedded steel column base structure obtained through construction, the column base of the steel structure column is embedded into the pit, and the bottom of the column base of the steel structure column is not required to be provided with complex steel stiffening ribs by utilizing the rigidity provided by the peripheral raft foundation, so that construction is simple and convenient, meanwhile, the steel structure column is combined with the externally-coated foundation column with enough rigidity, and the problem that huge bending moment of an upper steel column is transmitted to the foundation is effectively solved; in addition, in actual construction, the raft foundation and the externally-wrapped foundation column cannot be formed in a one-step pouring mode, so that the problem of safely transmitting the horizontal force at the bottom of the steel column foot can be effectively solved by designing the pits in the raft foundation; in addition, compare with traditional formula steel column foot of buryying, reduced the degree of depth that the steel construction post buryyed the raft foundation through the setting of outsourcing foundation column, provide the space for laying of underground pipeline, simultaneously, the raft foundation need not be done like traditional formula steel column foot of buryying is so thick, saves the cost.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

fig. 1 is a schematic structural diagram of a half-encased half-embedded steel column base structure according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a raft foundation of a semi-encased semi-embedded steel column foot structure according to an embodiment of the present invention;

fig. 3 is a schematic top view of a raft foundation and a steel structure column of the semi-externally-wrapped and semi-embedded steel column base structure according to an embodiment of the present invention;

fig. 4 is a schematic horizontal sectional view of a steel column with a semi-encased semi-embedded steel column base structure according to an embodiment of the present invention after being combined with an encased foundation column;

fig. 5 is a schematic front view of embedded parts and anchor bars in connecting members of a raft foundation of a semi-externally-wrapped semi-embedded steel column foot structure according to an embodiment of the present invention;

fig. 6 is a schematic bottom view of the attachment structures and anchor bars in the attachment components of the raft foundation of the semi-externally-wrapped semi-embedded steel column foot structure according to an embodiment of the present invention;

fig. 7 is a schematic top view of a steel column with a semi-encased semi-embedded steel column base structure according to an embodiment of the present invention;

fig. 8 is a flowchart illustrating steps of a construction method of a half-encased half-embedded steel column base structure according to a second embodiment of the present invention;

fig. 9 is a flowchart illustrating another step of the construction method of the half-encased half-embedded steel column base structure according to the second embodiment of the present invention;

the reference numbers illustrate:

1. a raft foundation;

11. a pit;

12. a connecting member;

121. pre-burying a plate;

122. anchoring ribs;

123. a screw;

13. raft plate steel bars;

14. reinforcing steel bars are supplemented to the raft plates;

2. a steel structural column;

21. a base plate;

22. a cylinder;

23. a stud;

3. wrapping a foundation column outside;

31. longitudinal reinforcing steel bars;

32. and (5) hooping.

Detailed Description

In order to clearly understand the technical solution, the purpose and the effect of the present invention, a detailed description of the present invention will be described with reference to the accompanying drawings.