CN218714346U

CN218714346U - Prefabricated column bottom connection structure that shears

Info

Publication number: CN218714346U
Application number: CN202222563333.8U
Authority: CN
Inventors: 马小玲; 吴宏磊; 邱令乾; 喻欣妮
Original assignee: Architecture Design and Research Institute of Tongji University Group Co Ltd
Current assignee: Architecture Design and Research Institute of Tongji University Group Co Ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2023-03-24
Anticipated expiration: 2032-09-27

Abstract

The utility model relates to a shear connection structure at the bottom of a prefabricated column, which comprises an upper-layer prefabricated column, wherein a socket hoop is preset at the bottom of the upper-layer prefabricated column so as to form a prefabricated jack; prefabricating a column on the lower layer; the lower section of the shear-resistant anchor bolt is prefabricated and fixed in the lower-layer prefabricated column through anchor bars, and the upper section of the shear-resistant anchor bolt is inserted into the prefabricated insertion hole, so that the middle section of the shear-resistant anchor bolt is exposed outside and forms a post-pouring area between the upper-layer prefabricated column and the lower-layer prefabricated column; and post-pouring area concrete, which is poured between the lower prefabricated column and the upper prefabricated column, and the middle section of the shear-resistant anchor bolt penetrates through the post-pouring area concrete. The structure also includes a joint casting area. Compared with the prior art, the utility model provides a prefabricated toe portion connection structure that shears has strengthened the effect of shearing of prefabricated post seam crossing in upper and lower floor, atress safe and reliable, simple structure, and construction convenience can effectual improvement site operation efficiency.

Description

Prefabricated column bottom connection structure that shears

Technical Field

The utility model belongs to the technical field of the assembly type structure technique and specifically relates to a prefabricated toe portion connection structure that shears is related to.

Background

The prefabricated column is a common prefabricated component in the building engineering, has higher repetition rate, has relatively simple moulds, accords with the industrialized and standardized prefabrication concept, and is a prefabrication preference in the public building project. However, for the prefabricated column, due to the existence of the joint at the bottom of the column, the problem of shearing resistance at the joint needs to be considered, when the vertical steel bars of the column cannot meet the shearing resistance requirement at the joint, reinforcement measures need to be taken to improve the shearing resistance bearing capacity, the vertical steel bars at the joint are usually increased, and the shearing resistance requirement can be met by increasing a plurality of large-diameter steel bars at the most unfavorable position of the structure. For example, CN 213448909U discloses a semi-dry type connection of precast column bolt anti-shear member, which comprises an upper precast column, a lower precast column, a connection panel, a connection assembly and an anti-shear steel member, wherein an anti-shear groove is formed in the center of the lower end of the upper precast column, the connection panel is fixedly disposed on the lower end surface of the upper precast column, a return hole matched with the anti-shear return shape is formed in the connection panel, the anti-shear steel member is disposed in the anti-shear groove, a grouting gap is formed between the anti-shear steel member and the side wall of the anti-shear groove, a grouting material is filled in the grouting gap, an upward extending steel bar is disposed in the lower precast column, the connection assembly is disposed on the top of the steel bar, a steel bar hole is formed in the corresponding position of the connection panel and the steel bar, and the steel bar passes through the steel bar hole and is fixedly connected with the connection panel through the connection assembly. The column is limited by the fact that the column cross-sectional size and the column per se are more in vertical connecting steel bars, the increase of the shear-resistant connecting steel bars is difficult to meet the requirement of the net distance of the steel bars, corresponding holes and hole grouting are needed to be reserved on the upper-layer prefabricated columns simultaneously, and construction difficulty and workload are increased undoubtedly. On the other hand, the problems of incompact grouting and inaccurate alignment of grouting holes often occur, more field wet operation is performed, and the problem of potential safety hazards to a certain degree is brought.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a prefabricated toe portion connection structure that shears in order to overcome the defect that above-mentioned prior art exists, the structure biography power in this scheme is direct reliable, and site operation is convenient, can effectively reduce wet operation problem, compensaties the potential safety hazard of existence.

The purpose of the utility model can be realized through the following technical scheme:

the utility model aims at providing a prefabricated toe portion connection structure that shears, this structure includes:

the prefabricated jack comprises an upper-layer prefabricated column, wherein a socket hoop is preset at the bottom of the upper-layer prefabricated column to form a prefabricated jack;

prefabricating a column on the lower layer;

the lower section of the shear-resistant anchor bolt is prefabricated and fixed in the lower prefabricated column through an anchor bar, and the upper section of the shear-resistant anchor bolt can be inserted into the prefabricated insertion hole, so that the middle section of the shear-resistant anchor bolt is exposed to the outside and forms a post-pouring area between the upper prefabricated column and the lower prefabricated column;

and post-pouring area concrete, which is poured between the lower prefabricated column and the upper prefabricated column, and the middle section of the shear-resistant anchor bolt penetrates through the post-pouring area concrete.

Preferably, the socket hoop is of a hat type structure with an opening at the lower end.

Further preferably, the socket hoop is matched with the upper section of the shear anchor bolt.

Further, the shear-resistant anchor bolt is aligned with the center of the socket hoop.

Further preferably, the socket hoop is a steel plate arranged outside the shear anchor bolt, and a certain gap is reserved between the socket hoop and the shear anchor bolt.

Further, a seam pouring area is further arranged between the post-pouring area concrete and the upper-layer prefabricated column.

Preferably, the shear anchor is a 35# round steel shear anchor.

Preferably, the height of the shear anchor bolt extending into the upper prefabricated column is not less than 120mm.

Preferably, the anchor bars are U-shaped steel bar anchor bars.

Furthermore, the socket hoop is preset at the center of the bottom of the upper prefabricated column.

Further, the lower segment of the shear anchor bolt is prefabricated and fixed at the center of the top of the lower prefabricated column.

Further preferably, the joint pouring area is generally grouted and filled while the upper precast column is subjected to a sleeve grouting operation.

Compared with the prior art, the utility model discloses following beneficial effect has:

1) This technical scheme is through adopting the effectual demand that shears that has satisfied upper and lower floor's post seam crossing of mode of crab-bolt that shears, has also reduced shared post cross-section simultaneously and has taken up between and construction operation work load, atress safe and reliable, simple structure can effectual improvement site operation efficiency.

2) According to the technical scheme, the shear-resistant bearing capacity of the joint can be enhanced through the shear-resistant connecting structure at the top of the lower-layer prefabricated column and the bottom of the upper-layer prefabricated column, and the horizontal displacement requirement under the action of an earthquake can be met.

Drawings

Fig. 1 is a schematic three-dimensional structure diagram of a shear connection structure at the bottom of a precast column in the technical scheme.

Fig. 2 is a schematic cross-sectional structure view of a shear connection structure at the bottom of a precast column in the present technical solution.

In fig. 1 and 2, the reference numerals denote:

1. the prefabricated post of upper strata, 2, lower floor's prefabricated post, 3, post-cast region concrete, 4, seam pouring district, 5, crab-bolt that shears, 6, anchor bar, 7, socket joint hoop.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. In the technical scheme, the characteristics such as the part type, the material name, the connection structure and the like which are not explicitly described are all regarded as common technical characteristics disclosed in the prior art.

The present invention will be described in detail with reference to the following embodiments, which are specific embodiments of a shear connection structure for a prefabricated column bottom, as shown in fig. 1 and 2.

As shown in fig. 1 and 2, an upper prefabricated column node and a lower prefabricated column node are arranged between an upper prefabricated column 1 and a lower prefabricated column 2, the node improves the shear strength of a joint between the upper prefabricated column 1 and the lower prefabricated column 2 through a shear connection structure in the technical scheme, the upper prefabricated column 1 is arranged at the upper part of the node, the lower prefabricated column 2 is arranged at the lower part of the node, a socket hoop 7 is preset at the bottom of the upper prefabricated column 1 to form a prefabricated jack, the lower section of a shear anchor bolt 5 is prefabricated and fixed in the lower prefabricated column 2 through an anchor bar 6, the upper section of the shear anchor bolt 5 can be inserted in the prefabricated jack, the middle section of the shear anchor bolt 5 is exposed outside and forms a post-pouring area between the upper prefabricated column 1 and the lower prefabricated column 2, post-pouring area concrete 3 is poured between the lower prefabricated column 2 and the upper prefabricated column 1, and the middle section of the shear anchor bolt 5 penetrates through the post-pouring area concrete 3, so that the shear strength of the joint between the upper prefabricated column and the lower prefabricated column is enhanced.

In this embodiment, the crab-bolt 5 that shears adopts 35# round steel preparation, and its lower part passes through the anchor bar anchor in the 1 top central point of lower floor's prefabricated post and puts, and the middle section of crab-bolt 5 that shears exposes in outside and constitutes the post-cast region between upper precast post 1 and the prefabricated post 2 of lower floor, and stretches into upper precast post 1 height and is not less than 120mm.

In this embodiment, the anchor bars 6 are made of U-shaped steel bars, are welded firmly with the shear anchors 5, and are anchored in the lower prefabricated columns 2.

In this embodiment, socket hoop 7 is lower extreme open-ended cap formula structure, for the steel sheet that the crab-bolt 5 outside set up of shearing, is located upper prefabricated post 1 bottom central point department, and it is just aimed at with the crab-bolt 5 center of shearing and reserve certain gap between 5 with the crab-bolt that shears.

A joint pouring area 4 is further arranged between the post-pouring area concrete 3 and the upper-layer prefabricated column 1, and the joint pouring area 4 is generally filled when sleeve grouting operation is carried out on the upper-layer prefabricated column.

The concrete implementation steps of the shear connection structure at the bottom of the precast column in the technical scheme are as follows:

s1, prefabricating an upper-layer prefabricated column 1 in a factory, and embedding a socket hoop 7 at the central position of the bottom of the upper-layer prefabricated column 1 to enable the socket hoop 7 to form a prefabricated jack;

s2, prefabricating a lower-layer prefabricated column 2 in a factory, embedding a shear-resistant anchor bolt 5 in the central position of the upper part of the lower-layer prefabricated column 2, and effectively anchoring the shear-resistant anchor bolt 5 and surrounding concrete through an anchor bar 6 on the shear-resistant anchor bolt 5, wherein the anchor bar 6 is welded and fixed around the shear-resistant anchor bolt 5 in advance;

s3, installing a lower-layer prefabricated column 2 on a construction site;

s4, pouring post-cast area concrete 3 in a construction site;

s5, installing the upper-layer prefabricated column 1 on a construction site, wherein the position of the upper-layer prefabricated column corresponds to that of the lower-layer prefabricated column 2, and aligning the shear-resistant anchor bolt 5 with the socket hoop 7 in the center and inserting the shear-resistant anchor bolt into the prefabricated jack during installation;

and S6, grouting and filling the joint pouring area 4 through sleeve grouting of the upper-layer prefabricated column 1.

The shear-resistant connecting structure in the technical scheme strengthens the shear-resistant effect at the joint, and the prefabricated column has the advantages of safe and reliable stress, simple structure, convenient construction and capability of effectively improving the site construction efficiency.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should understand that all the improvements and modifications made without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A precast column bottom shear connection structure, characterized by comprising:

the prefabricated column comprises an upper-layer prefabricated column (1), wherein a socket hoop (7) is preset at the bottom of the upper-layer prefabricated column (1) so as to form a prefabricated jack;

a lower prefabricated column (2);

the lower section of the shear-resistant anchor bolt (5) is prefabricated and fixed in the lower-layer prefabricated column (2) through an anchor bar (6), and the upper section of the shear-resistant anchor bolt (5) is inserted in the prefabricated insertion hole, so that the middle section of the shear-resistant anchor bolt (5) is exposed to the outside and forms a post-pouring area between the upper-layer prefabricated column (1) and the lower-layer prefabricated column (2);

and (3) post-pouring area concrete (3) which is poured between the lower prefabricated column (2) and the upper prefabricated column (1), and the middle section of the shear-resistant anchor bolt (5) is made to run through the post-pouring area concrete (3).

2. The shear connection structure at the bottom of a precast column according to claim 1, wherein the female hoop (7) is a cap structure with an open lower end.

3. The shear connection structure at the bottom of a precast column according to claim 2, wherein the socket hoops (7) are matched with the upper section of the shear bolt (5).

4. The precast column bottom shear connection structure according to claim 2, wherein a joint pouring area (4) is further provided between the post-pouring area concrete (3) and the upper precast column (1).

5. The precast column bottom shear connection structure according to claim 1, wherein the shear anchors (5) are 35# round steel shear anchors (5).

6. The precast column bottom shear connection structure according to claim 1, wherein the shear anchors (5) protrude into the upper precast column (1) by a height of not less than 120mm.

7. The precast column bottom shear connection structure according to claim 1, wherein the anchor bars (6) are U-shaped steel bar anchor bars (6).

8. The precast column bottom shear connection structure according to claim 1, wherein the shear anchors (5) are aligned with the center of the socket hoops (7).

9. The precast column bottom shear connection structure according to claim 1, wherein the socket hoop (7) is preset at a bottom center position of the upper precast column (1).

10. The precast column bottom shear connection structure according to claim 1, wherein the lower segment of the shear anchor bolt (5) is precast and fixed to the top center of the lower precast column (2).