WO2022227177A1

WO2022227177A1 - Connection structure capable of achieving accurate positioning of multi-limb concrete-filled steel tube spatial structure and bearing platform, and construction method therefor

Info

Publication number: WO2022227177A1
Application number: PCT/CN2021/096714
Authority: WO
Inventors: 袁辉辉; 吴庆雄; 刘启仁; 林宇曦; 唐瑜; 杨益伦; 张利铨
Original assignee: 福州大学
Priority date: 2021-04-28
Filing date: 2021-05-28
Publication date: 2022-11-03
Also published as: DE212021000266U1; CN113026576A

Abstract

A connection structure for achieving accurate positioning of a multi-limb concrete-filled steel tube spatial structure and a bearing platform, and a construction method therefor. By providing supporting steel tube units (2), a steel body base unit (3), an anchoring steel unit (4), connecting steel tubes (5) and a concrete poured block (6) on the concrete bearing platform (1), the multi-limb concrete-filled steel tube structure can be relatively used for long-term high-strength support. The present application has the following advantages: first, the multi-limb concrete-filled steel tube structure has strong integrity, a strong internal connection structure, and is not prone to having breakage and disintegration occur after long-term high-load support; secondly, multi-limb steel tubes are uniformly and symmetrically arranged, and the whole connection strength is strengthened by means of the connecting steel tubes, so as to ensure that the whole support structure is uniformly stressed and stable in terms of support; and thirdly, the construction method for the entire multi-limb concrete-filled steel tube structure uses welding and pouring techniques, and the overall structure layout is rational, thereby finally ensuring that the construction operation is simple and efficient.

Description

A connection structure capable of realizing precise positioning of a multi-limb concrete-filled steel tubular space structure and a bearing platform and its construction method

technical field

The invention belongs to the technical field of bridge engineering, and in particular relates to a connection structure and a construction method thereof capable of realizing precise positioning of a multi-limb concrete-filled steel tube space structure and a bearing platform.

Background technique

The multi-limb CFST structure mainly includes supporting steel pipes and concrete support seats, which are generally used for the compression arch rib of large-span arch bridges. It has the advantages of strong impact resistance, good shock resistance, outstanding fire resistance and corrosion resistance, and moderate construction difficulty.

On the other hand, most of the existing multi-limb steel pipe structures have a certain degree of insufficient connection strength between the steel pipe and the concrete main body, which ultimately leads to the fact that the multi-limb steel pipe cannot support a large weight for a long time and under high load.

Therefore, in summary, there is an urgent need for a multi-limb steel pipe support base that can strengthen the connection strength between steel pipes and concrete, so that the entire support structure has better integrity and greater support strength.

The Chinese utility model patent with the patent announcement number CN207419230U and the announcement date of 2018.05.29 discloses a multi-limb hollow composite tower pier. The tower pier is composed of multi-limb tower columns or pier columns with at least one limb. The piers are connected by transverse braces, and the towers or piers of each leg are in the form of double-layer steel pipes. The towers or piers are composed of towers or pier segments with circulation holes and towers or piers without circulation holes. The segments are spliced up and down, the lower part of the tower column or pier column segment with circulation holes is connected with the bearing platform, the upper part is connected with the lower part of the tower column or pier column segment without circulation holes, and the tower column or pier column segment is connected with the lower part. Connect by anchoring short prestressed steel bars and through long prestressed steel bars that run through the entire tower or pier column.

However, in the multi-limb hollow composite tower pier in this utility model patent, the towers are only connected by cross braces. In this way, although the strength between the towers and the towers can be properly improved, the gap between the towers and the cap is still In the absence of a connecting structure, the lower end of the tower column is still easy to bend near the cap, so the integrity of the entire tower pier is not enough, and its support strength is also insufficient. If the high-load support is used in a relatively short period of time, the tower pier structure will be cracked, fracture problem.

technical solutions

The invention provides a connection structure and a construction method for realizing precise positioning between a multi-limb concrete-filled steel tubular space structure and a bearing platform, and a construction method thereof. And the way of pouring concrete blocks to achieve the purpose that the multi-limb CFST structure can be used for relatively long-term high-strength support.

The technical solution adopted by the present invention to solve the above problems is: a connection structure that can realize the precise positioning of the multi-limb concrete-filled steel tubular space structure and the bearing platform, including a concrete bearing platform, and a plurality of supporting steel pipe units arranged on the concrete bearing platform, arranged on the A steel base unit on the concrete deck and located between a plurality of the supporting steel pipe units, is arranged in the concrete deck and is used for connecting the anchoring steel reinforcing the supporting steel pipe unit and the steel base unit unit, a connecting steel pipe disposed between the steel body base unit and the supporting steel pipe unit, and a concrete pouring block disposed on the concrete bearing platform and whose upper surface is higher than the height of the upper end of the connecting steel pipe.

A further preferred technical solution is that: the supporting steel pipe unit includes a steel pipe main body whose lower end is disposed on the upper surface of the concrete bearing platform and is used for installing the connecting steel pipe, a steel pipe concrete disposed in the steel pipe main body, and a steel pipe body disposed in the steel pipe main body. Steel pipe shears on the steel pipe body and used to strengthen the connection in the concrete casting block.

A further preferred technical solution is that: all the supporting steel pipe units are arranged in a center-symmetrical arrangement with respect to the steel base unit.

A further preferred technical solution is that: the steel body base unit includes a base steel plate arranged on the upper surface of the concrete bearing platform, a hemisphere arranged on the upper surface of the base steel plate and used for installing the connecting steel pipe on the spherical surface. shaped steel block, and a base shearing member arranged on the hemispherical steel block and used to strengthen the connection in the concrete casting block.

A further preferred technical solution is that: the anchoring steel unit includes an anchoring base plate arranged in the concrete bearing platform, a threaded column arranged at the middle position of the upper surface of the anchoring base plate and used for connecting with the base steel plate, and A reinforcing member for reinforcing the main body of the steel pipe is provided at the position of the side edge of the upper surface of the anchoring base plate and is inserted into the concrete-filled steel pipe.

A further preferred technical solution is that: the reinforcing member is a section steel or a steel rod.

A further preferred technical solution is that: the supporting steel pipe unit further comprises a steel pipe hole provided on the steel pipe main body and used for inserting and installing the steel pipe shearing member, and the anchoring steel unit further comprises a steel pipe hole provided on the reinforcing member and used for inserting and installing the steel pipe shearing member. Insert the steel plate holes where the steel pipe shears are installed.

A further preferred technical solution is that the height of the upper end surface of the concrete filled steel tube is higher than the height of the upper surface of the concrete casting block.

The construction method of the connection structure that can realize the precise positioning of the multi-limb concrete-filled steel tubular space structure and the bearing platform includes the following steps in sequence:

S1, installing and connecting the anchoring steel unit, and pouring concrete on the anchoring steel unit to form the concrete bearing platform to obtain a concrete support base;

S2, installing the steel body base unit on the concrete support base to obtain the preliminary main body of the multi-limb steel pipe;

S3, installing the steel pipe main body of the supporting steel pipe unit and the connecting steel pipe on the preliminary main body of the multi-limb steel pipe to obtain the mid-term main body of the multi-limb steel pipe;

S4, pouring the steel pipe concrete in the supporting steel pipe unit of the mid-stage body of the multi-limb steel pipe to obtain the later-stage body of the multi-limb steel pipe;

S5. The concrete casting block is formed by pouring on the later main body of the multi-limb steel pipe to obtain the final multi-limb CFST structure.

beneficial effect

The invention has the following advantages: first, the multi-limb CFST structure has strong integrity, the internal connection structure is strong, and it is not easy to break and decompose after long-term high-load support; second, the multi-limb steel pipes are evenly and symmetrically arranged, and pass The steel pipes are connected to strengthen the overall connection strength and ensure that the entire support structure is uniformly stressed and supported. Third, the construction method of the entire multi-limb CFST structure mostly adopts welding and pouring technology, and the overall structure layout is also reasonable, which ultimately ensures simple construction operations. Efficient.

Description of drawings

FIG. 1 is a schematic diagram of the use of the multi-limb CFST structure in the present invention.

FIG. 2 is a schematic diagram of a first distribution manner of a plurality of supporting steel pipe units in a top view according to the present invention.

3 is a schematic diagram of the position structure of the supporting steel pipe unit, the steel base unit and the anchoring steel unit in the present invention.

FIG. 4 is a schematic diagram of the connection structure between the steel pipe shearing member and the reinforced steel plate in the present invention.

FIG. 5 is a schematic diagram of a second distribution manner of a plurality of supporting steel pipe units in a top view according to the present invention.

FIG. 6 is a schematic diagram of a third distribution manner of a plurality of supporting steel pipe units in a top view according to the present invention.

Embodiments of the present invention

The following descriptions are only preferred embodiments of the present invention, and do not limit the scope of the present invention.

Example: As shown in Figures 1, 2, 3, 4, 5 and Figure 6, the connection structure of the multi-limb concrete-filled steel tubular space structure and the bearing platform can be realized, including the concrete bearing platform 1, which is arranged on the concrete A plurality of supporting steel pipe units 2 on the bearing platform 1, and the steel base units 3 arranged on the concrete bearing platform 1 and located between the plurality of the supporting steel pipe units 2, are arranged in the concrete bearing platform 1 and used together For connecting and strengthening the anchoring steel unit 4 of the supporting steel pipe unit 2 and the steel base unit 3, the connecting steel pipe 5 provided between the steel base unit 3 and the supporting steel pipe unit 2, and the The concrete pouring block 6 on the concrete bearing platform 1 and whose upper surface is higher than the height of the upper end of the connecting steel pipe 5 .

In this embodiment, the supporting steel pipe unit 2 , the steel body base unit 3 , the anchoring steel unit 4 and the connecting steel pipe 5 form a complete steel structure for ensuring the supporting strength, while the concrete cap 1 First pouring is used to install the above-mentioned steel structure, and the concrete pouring block 6 is poured later to reinforce the above-mentioned steel structure, so that the entire multi-limb CFST structure has high structural strength when used for bridge support, and allows large loads and The advantage of long-term stable use.

The supporting steel pipe unit 2 includes a steel pipe main body 201 whose lower end is disposed on the upper surface of the concrete cap 1 and is used for installing the connecting steel pipe 5, a steel pipe concrete 202 disposed in the steel pipe main body 201, and a steel pipe body 202 disposed in the steel pipe main body 201. Steel pipe shears 203 on the steel pipe body 201 and used to strengthen the connection in the concrete casting block 6 .

In this embodiment, the above-mentioned steel structures are made of existing high-strength steel, and the concrete materials used for the concrete filled steel tube 202 , the concrete bearing platform 1 and the concrete casting block 6 are existing suitable high-strength concrete.

The distance between the upper ends of any two supporting steel pipe units 2 may be larger or smaller than the distance between the lower ends.

In this embodiment, the plurality of the steel pipe main bodies 201 may be "expanded" or "folded" like "flowers".

All the supporting steel pipe units 2 are arranged in a center-symmetrical arrangement with respect to the steel body base unit 3 .

In this embodiment, it can also be linearly arranged or arranged in a circle to form a trapezoid in a plan view, as shown in FIG. 5 and FIG. 6 .

The steel body base unit 3 includes a base steel plate 301 arranged on the upper surface of the concrete bearing platform 1, and a hemispherical steel plate 301 arranged on the upper surface of the base steel plate 301 and used for installing the connecting steel pipe 5 on the spherical surface. block 302 , and a base shearing member 303 arranged on the hemispherical steel block 302 and used to strengthen the connection in the concrete casting block 6 .

In the present embodiment, the hemispherical steel block 302 may be solid or open, as long as the connecting steel pipe 5 can be stably welded and fixed, and the base shearing member 303 and the The steel pipe shearing members 203 have the same structure, all of which are T-shaped structures, which ensure that the steel pipe body 201 and the hemispherical steel block 302 can be "pulled" correspondingly in the concrete casting block 6 formed later.

The anchoring steel unit 4 includes an anchoring base plate 401 arranged in the concrete bearing platform 1, a threaded post 402 arranged at the middle position of the upper surface of the anchoring base plate 401 and used for connecting with the base steel plate 301, and a A reinforcing member 403 for reinforcing the steel pipe main body 201 is provided at the position of the side edge of the upper surface of the anchoring bottom plate 401 and by inserting the steel pipe concrete 202 .

In this embodiment, the base steel plate 301 is provided with an opening for inserting the threaded post 402 and a matching tightening nut. The number of the threaded post 402 is 4 for stabilizing the screw Connect to the four corners of the base steel plate 301 .

In addition, the structure of the reinforcement member 403 may also be tubular, and it is sufficient to ensure that the reinforcement member 403 can be stably “pulled” by the CFST 202 .

Finally, both the threaded post 402 and the reinforcing member 403 are welded with the upper surface of the anchoring bottom plate 401 , and the welding angle depends on the inclination angle of the steel pipe body 201 , and the reinforcing member 403 is guaranteed to be on the steel pipe body 201 . The inner part should be located at the center position as much as possible to ensure that the above-mentioned "pulling" structure has the effect of uniform force.

The reinforcing member 403 is a section steel or a steel rod.

In this embodiment, the functions of the reinforcing member 403 and the connecting steel pipe 5 are essentially the same, both of which are to reinforce the steel pipe main body 201. Therefore, the reinforcing member 403 is set relatively low, which can ensure the connection with the steel pipe 5. The connection and reinforcement effect of the connecting steel pipe 5 has the advantages of upper and lower partitions and coordinated use, which avoids the harmful problem that the connecting steel pipe 5 pulls and fixes the reinforcing member 403 and is not conducive to strengthening the steel pipe main body 201 .

The supporting steel pipe unit 2 further includes a steel pipe hole 204 provided on the steel pipe main body 201 for inserting and installing the steel pipe shearing member 203, and the anchoring steel unit 4 further includes a steel pipe hole 204 provided on the reinforcing member 403 for inserting Install the steel plate holes 404 of the steel pipe shears 203 .

In this embodiment, the number of the reinforcing members 403 may be 1-4, so that the steel pipe body 201 also corresponds to 1-4 rows of the steel pipe shearing members 203, so as to ensure the shear force of each steel pipe The reinforcing member 203 can be inserted into the steel plate hole 404 after passing through the steel pipe hole 204, so that the reinforcing member 403 has the following two fixing structures: first, it is fixed by the steel pipe concrete 202; second, it is fixed by the The steel pipe shearing member 203 is inserted and fixed, so that the reinforcing member 403 and the steel pipe main body 201 are more integrated, so as to ensure the final structural integrity and high strength advantages.

The height of the upper end surface of the concrete filled steel tube 202 is higher than the height of the upper surface of the concrete casting block 6 .

In this embodiment, the position between the steel pipe body 201 and the upper surface of the concrete casting block 6 is the most concentrated part, where the steel pipe body 201 is most likely to fail. In a way of setting a relatively large amount of concrete filled steel tube 202, the upper end surface of the concrete filled steel tube 202 is higher than the upper surface of the concrete pouring block 6, so that the force that causes the above bending effect is determined by the main body of the steel tube 201 and all of them. The concrete-filled steel pipes 202 are "undertaken" together, so the support strength of the supporting steel pipe units 2 can be further strengthened.

S1, installing and connecting the anchoring steel unit 4, and pouring concrete on the anchoring steel unit 4 to form the concrete bearing platform 1 to obtain a concrete support base;

S2. Install the steel body base unit 3 on the concrete support base to obtain the preliminary main body of the multi-limb steel pipe;

S3. Install the steel pipe body of the supporting steel pipe unit 2 and the connecting steel pipe 5 on the preliminary body of the multi-limb steel pipe to obtain the mid-term body of the multi-limb steel pipe;

S4, pouring the steel pipe concrete 202 in the supporting steel pipe unit 2 of the mid-term body of the multi-limb steel pipe to obtain the later-stage body of the multi-limb steel pipe;

S5. The concrete casting block 6 is formed by pouring on the later main body of the multi-limb steel pipe to obtain the final multi-limb CFST structure.

In this embodiment, the steel pipe shearing member 203 is inserted with the reinforcing member 403 first, and then the steel pipe concrete 202 is poured, so that the structures of the anchoring steel unit 4 and the supporting steel pipe unit 2 are fixed. It is down, but it cannot be greatly stressed at this time, and it can be used with a temporary steel pipe support frame.

The steel pipe concrete 202 can be poured into the upper end opening of the steel pipe body 201 .

Next, the connecting steel pipes 5 are welded, and finally the concrete pouring blocks 6 are poured, so that the entire outer side of the multi-limb CFST structure also has a concrete "frame", which further improves the overall strength of the multi-limb CFST structure. Of course, when the multi-limb CFST structure is used, a load needs to be installed on the supporting steel pipe unit 2, so that the multi-limb CFST structure can be put into use.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the technical field, it can also be done without departing from the purpose of the present invention. various modifications. These are all non-creative modifications, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

A connection structure capable of realizing precise positioning of a multi-limb concrete-filled steel tubular space structure and a bearing platform is characterized in that: comprising a concrete bearing platform (1), a plurality of supporting steel pipe units (2) arranged on the concrete bearing platform (1), A steel base unit (3) arranged on the concrete bearing platform (1) and located between a plurality of the supporting steel pipe units (2), is arranged in the concrete bearing platform (1) and is used to connect the reinforcement The anchoring steel unit (4) of the supporting steel pipe unit (2) and the steel base unit (3) is provided as a connecting steel pipe between the steel base unit (3) and the supporting steel pipe unit (2). (5), and a concrete pouring block (6) arranged on the concrete bearing platform (1) and whose upper surface is higher than the height of the upper end of the connecting steel pipe (5).
The connection structure capable of realizing precise positioning between the multi-limb concrete-filled steel tubular space structure and the bearing platform according to claim 1, characterized in that: the supporting steel pipe unit (2) comprises a lower end disposed on the upper surface of the concrete bearing platform (1). A steel pipe body (201) on the steel pipe body (201) and used for installing the connecting steel pipe (5), a steel pipe concrete (202) provided in the steel pipe body (201), and a steel pipe body (201) provided on the steel pipe body (201) and used in the steel pipe body (201). The steel pipe shear member (203) for strengthening the connection in the concrete pouring block (6).
The connection structure capable of realizing precise positioning between the multi-limb concrete-filled steel tubular space structure and the bearing platform according to claim 1, characterized in that: all the supporting steel pipe units (2) are centrally symmetric with respect to the steel base unit (3) Layout settings.
The connection structure capable of realizing precise positioning between the multi-limb concrete-filled steel tubular space structure and the bearing platform according to claim 2, characterized in that: the steel body base unit (3) comprises a structure arranged on the upper surface of the concrete bearing platform (1). The base steel plate (301) on the base plate (301), the hemispherical steel block (302) arranged on the upper surface of the base steel plate (301) and used for installing the connecting steel pipe (5) on the spherical surface, and the hemispherical steel block (302) disposed on the hemispherical surface The base shears (303) on the steel block (302) and used to strengthen the connection within the concrete casting block (6).
The connection structure capable of realizing precise positioning between the multi-limb concrete-filled steel tubular space structure and the bearing platform according to claim 4, characterized in that: the anchoring steel unit (4) comprises an anchoring device arranged in the concrete bearing platform (1). A bottom plate (401), a threaded post (402) provided at the middle position of the upper surface of the anchoring bottom plate (401) and used for connecting with the base steel plate (301), and a threaded post (402) provided on the upper surface of the anchoring bottom plate (401) A reinforcement (403) for reinforcing the steel pipe body (201) at the side position and by inserting the steel pipe concrete (202).
The connection structure capable of realizing precise positioning of the multi-limb concrete-filled steel tubular space structure and the bearing platform according to claim 5, characterized in that: the reinforcing member (403) is a section steel or a steel rod.
The connection structure capable of realizing precise positioning between the multi-limb CFST space structure and the bearing platform according to claim 5, characterized in that: the supporting steel pipe unit (2) further comprises a steel pipe body (201) arranged on the steel pipe body (201) and used for inserting The steel pipe hole (204) for installing the steel pipe shearing piece (203), the anchoring steel unit (4) further comprises a steel pipe hole (204) provided on the reinforcing piece (403) and used for inserting and installing the steel pipe shearing piece (203) plate hole (404).
The connection structure capable of realizing precise positioning of the multi-limb concrete-filled steel tubular space structure and the bearing platform according to claim 2, characterized in that: the height of the upper end surface of the concrete filled steel tubular (202) is higher than the upper surface of the concrete pouring block (6). surface height.
The construction method of the connection structure that can realize the precise positioning of the multi-limb concrete-filled steel tubular space structure and the bearing platform as claimed in claim 4 is characterized in that the following steps are included in sequence:

S1, installing and connecting the anchoring steel unit (4), and pouring concrete on the anchoring steel unit (4) to form the concrete bearing platform (1) to obtain a concrete support base;

S2. Install the steel body base unit (3) on the concrete support base to obtain a preliminary body of a multi-limb steel pipe;

S3. Install the steel pipe body of the supporting steel pipe unit (2) and the connecting steel pipe (5) on the preliminary body of the multi-limb steel pipe to obtain the mid-term body of the multi-limb steel pipe;

S4, pouring the steel pipe concrete (202) in the supporting steel pipe unit (2) of the mid-stage body of the multi-limb steel pipe to obtain the later-stage body of the multi-limb steel pipe;

S5. The concrete casting block (6) is formed by pouring on the later main body of the multi-limb steel pipe to obtain the final multi-limb CFST structure.