WO2022161085A1

WO2022161085A1 - Equivalent steel concrete precast column and construction method therefor

Info

Publication number: WO2022161085A1
Application number: PCT/CN2021/142345
Authority: WO
Inventors: 陈云; 张琦俊
Original assignee: 海南大学
Priority date: 2021-01-27
Filing date: 2021-12-29
Publication date: 2022-08-04
Also published as: CN112922234A

Abstract

An equivalent steel concrete precast column and a construction method therefor. The equivalent steel concrete precast column comprises a concrete body and an equivalent steel connecting member, and the equivalent steel connecting member is arranged in the axis direction of the concrete body and protrudes from an end face of the concrete body. The equivalent steel connecting member arranged in the length direction of the concrete body meets the requirements of tensile strength and bending strength for the precast column; and the equivalent steel connecting member protrudes from the end face of the concrete body, such that when two precast columns are connected, the equivalent steel connecting members of the two precast columns can be welded first, and then the two precast columns are connected by means of local formwork erecting and concrete pouring. Therefore, the equivalent steel connecting member not only enhances the connecting strength of the joint of the two precast columns, but also simplifies the process of welding construction and reduces the difficulty of welding construction.

Description

A kind of equivalent steel concrete prefabricated column and its construction method

This application claims the priority of the Chinese patent application filed on January 27, 2021 with the application number 202110113775.X and the invention titled "An Equivalent Steel Concrete Precast Column and Its Construction Method", the entire contents of which are Incorporated herein by reference.

technical field

The invention relates to the technical field of construction, and more particularly, to an equivalent steel-concrete prefabricated column. In addition, the present invention also relates to a construction method for an equivalent-shaped steel-concrete prefabricated column suitable for the above-mentioned equivalent-shaped steel-concrete prefabricated column.

Background technique

Prefabricated buildings have outstanding advantages such as high degree of industrialization and pollution reduction, and have been vigorously promoted and applied at home and abroad.

In order to ensure the overall mechanical performance of the prefabricated building, it is necessary to connect the components through the nodes, so that they can be jointly stressed under the load. Due to the complex stress mechanism of the building structure, the nodes are often not in a single stress state, and the nodes need to have sufficient strength, stiffness and stability to ensure that the nodes can safely and reliably transmit the internal force of each component.

The transmission of reinforced concrete prefabricated columns has certain operational difficulties in the assembly process, especially the currently widely used reinforced sleeve grouting connection requires high construction and connection, and the grouting quality is difficult to detect, which affects the promotion and application of reinforced concrete assembly structures.

To sum up, how to simplify the construction process of the prefabricated column while ensuring the structural strength and stiffness, and provide an effective and feasible connection method is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide an equivalent steel concrete prefabricated column, the end face of the concrete main body is protruded with an equivalent steel connector, which not only ensures the connection strength of the prefabricated column connection, but also simplifies the construction process.

In addition, the present invention also provides a construction method for an equivalent-shaped steel-concrete prefabricated column suitable for the above-mentioned equivalent-shaped steel-concrete prefabricated column.

In order to achieve the above object, the present invention provides the following technical solutions:

An equivalent steel concrete prefabricated column comprises a concrete main body and an equivalent steel connecting piece, the equivalent steel connecting piece is arranged along the axis direction of the concrete main body, and the equivalent steel connecting piece protrudes from the concrete main body end face.

Preferably, the equivalent section steel connector includes at least two pre-embedded section steels, and tie bars and/or tie plates are arranged between two adjacent embedded section steels.

Preferably, a plurality of studs are arranged on the inner wall surface of the pre-embedded section steel, and the studs are evenly distributed in the length direction of the pre-embedded section steel.

Preferably, the pre-embedded steel includes T-shaped steel, C-shaped steel, I-beam, angle steel, steel pipe or welded joints of combined steel pipes.

Preferably, the equivalent section steel connector includes a pre-embedded steel member disposed in the center of the concrete main body, and spiral stirrups are arranged around the outer side of the pre-embedded steel member.

Preferably, the outer wall surface of the pre-embedded steel member is provided with a plurality of studs, and the studs are evenly distributed in the length direction of the pre-embedded steel member.

Preferably, a plurality of longitudinal bars are arranged in the concrete main body, and the longitudinal bars are arranged along the axis direction of the concrete main body.

A construction method for an equivalent steel concrete prefabricated column, used for the equivalent steel concrete prefabricated column described in the claim, comprising:

Assemble the equivalent section steel connector, pour the prefabricated column upper column and the prefabricated column lower column;

Lifting the upper column of the prefabricated column to just above the lower column of the prefabricated column;

welding the equivalent section steel connector of the upper column of the prefabricated column and the equivalent section steel connector of the lower column of the prefabricated column;

A formwork is partially supported between the lower end surface of the upper column of the prefabricated column and the upper end surface of the lower column of the prefabricated column, and concrete pouring is performed.

Preferably, between the hoisting the upper column of the prefabricated column and the partial formwork, it includes:

Connect the longitudinal ribs of the upper column of the prefabricated column and the longitudinal ribs of the lower column of the prefabricated column, and connect the longitudinal ribs at the lower end of the upper column of the prefabricated column and the longitudinal ribs at the upper end of the lower column of the prefabricated column Configure the encrypted stirrups.

The equivalent steel concrete prefabricated column provided by the present invention is pre-buried with equivalent steel connectors in the concrete main body, and the equivalent steel connectors are arranged along the length direction of the concrete main body, which satisfies the compressive, tensile, flexural and Shear strength requirements; the equivalent section steel connector protrudes from the end face of the concrete main body, so when connecting two prefabricated columns, the equivalent section steel connector of the two can be welded first, and then the local formwork is supported, the tie-in stirrups are attached, and the concrete is connected. The two prefabricated columns and the equivalent section steel connector not only strengthens the connection strength of the connection between the two prefabricated columns, but also simplifies the connection nodes and greatly reduces the construction difficulty.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a schematic structural diagram of a specific embodiment 1 of an equivalent steel-concrete prefabricated column provided by the present invention;

Fig. 2 is the sectional schematic diagram of Fig. 1 in the A-A direction;

3 is a schematic structural diagram of a specific embodiment 2 of an equivalent steel concrete prefabricated column provided by the present invention;

Fig. 4 is the structural schematic diagram of the specific embodiment 3 of the equivalent steel concrete prefabricated column provided by the present invention;

Fig. 5 is the structural schematic diagram of the specific embodiment 4 of the equivalent steel concrete prefabricated column provided by the present invention;

FIG. 6 is a schematic cross-sectional view of FIG. 5 in the B-B direction;

Fig. 7 is the structural schematic diagram of the specific embodiment 5 of the equivalent steel concrete prefabricated column provided by the present invention;

Fig. 8 is a schematic flow chart of the construction method of the equivalent steel concrete prefabricated column provided by the present invention.

In Figure 1-Figure 8:

01 is the upper column of the prefabricated column, 02 is the lower column of the prefabricated column, 1 is the concrete main body, 2 is the embedded section steel, 3 is the strip, 4 is the embedded steel member, 5 is the spiral stirrup, 6 is the longitudinal reinforcement, 7 is the The pegs and 8 are annular reinforcing plates.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The core of the invention is to provide an equivalent steel concrete prefabricated column, the end face of the concrete main body is protruded with an equivalent steel connector, which not only ensures the connection strength of the prefabricated column connection, but also simplifies the construction process.

Please refer to Figure 1-Figure 8.

The equivalent steel concrete prefabricated column provided by the present invention includes a concrete body 1 and an equivalent steel connector, the equivalent steel connector is arranged along the axis of the concrete body 1 , and the equivalent steel connector protrudes from the end face of the concrete body 1 .

The concrete main body 1 is poured according to the design size; the equivalent section steel connectors are arranged along the length direction of the concrete main body 1, and the equivalent section steel connectors can be arranged through the length direction of the concrete main body 1, as shown in Figure 1, Figure 3, Figure 4 , and replace some or all of the longitudinal bars in the prefabricated column 1 by equivalent bearing capacity; it can also be set only at a certain length of the concrete main body 1, as shown in Figure 5 and Figure 7, which mainly play the role of node connection; equivalent steel connection The specific length of the part protruding from the end face of the concrete main body 1 is determined according to factors such as the operating space required for welding and connecting the equivalent section steel connector.

During construction, it is often necessary to connect two equivalent steel concrete prefabricated columns. First, hoist the upper column 01 of the prefabricated column to just above the lower column 02 of the prefabricated column, so that the equivalent steel connector of the upper column 01 of the prefabricated column and the lower column 01 of the prefabricated column are connected. Equivalent section steel connectors are arranged oppositely; the equivalent section steel connector connecting the upper column 01 of the prefabricated column and the equivalent section steel connector of the lower column 02 of the prefabricated column; the lower end face of the upper column 01 of the prefabricated column and the upper section of the lower column 02 of the prefabricated column Partial formwork support is carried out between the end faces and reinforced stirrups are arranged, and concrete is poured.

In this embodiment, the concrete main body 1 is pre-embedded with equivalent shaped steel connectors, and the equivalent shaped steel connectors are arranged along the length of the concrete main body 1 to meet the strength requirements of the prefabricated columns; the equivalent shaped steel connectors protrude from the concrete main body Therefore, when connecting the two prefabricated columns, the equivalent section steel connectors of the two can be welded first, and then the local formwork, tying and tightening stirrups, pouring concrete to connect the two prefabricated columns, the equivalent section steel connectors not only strengthen the two prefabricated columns. The connection strength of the prefabricated column connection also simplifies the node connection method and reduces the construction difficulty.

Preferably, a plurality of longitudinal bars 6 may be provided in the concrete main body 1 , and the longitudinal bars 6 are arranged along the axial direction of the concrete main body 1 .

The type and size of the longitudinal bars 6 are determined according to the design strength requirements of the prefabricated columns, and the setting positions of the longitudinal bars 6 are determined according to factors such as the design strength of the prefabricated columns and the placement positions of the equivalent section steel connectors.

It should be noted that the longitudinal bars 6 and the equivalent section steel connectors have the same functions. Under the premise of ensuring the design strength of the prefabricated column, the number of the longitudinal bars 6 can be reduced by setting the equivalent section steel connectors.

On the basis of the above-mentioned embodiment, the equivalent section steel connector may include at least two embedded section steels 2 , and tie bars 3 and/or tie plates are provided between two adjacent embedded section steels 2 .

The quantity of the embedded steel 2 is related to the size of the embedded steel 2 and the shape and size of the concrete main body 1. Since the section of the equivalent steel-concrete precast column is mostly rectangular, in order to enhance the strength of the precast column, the embedded steel 2 The number of 2 is set to four, and the four embedded steels 2 are distributed in the direction of the four corners of the rectangular section.

Preferably, the embedded section steel 2 may include T-section steel, C-section steel, I-beam, angle steel, steel pipe or composite steel plate weldment, which has a simple structure, is convenient for strength and stiffness checking and calculation, is easy to obtain, and has a low cost. The specific model of the embedded section steel 2 is selected according to the design calculation of the prefabricated column, and will not be repeated here.

In order to enhance the connection strength between the embedded steel 2 and the concrete main body 1 , preferably, the inner wall surface of the embedded steel 2 is provided with several studs 7 , and the studs 7 are evenly distributed in the length direction of the embedded steel 2 . The size of the pegs 7 and the distance between two adjacent pegs 7 are determined according to actual architectural design requirements, and will not be repeated here.

The strips 3 and the strips are used to connect the two adjacent embedded steels 2, which enhances the connection strength between the embedded steels 2, avoids the positional deviation of the embedded steels 2 during the concrete pouring process, and acts as a prefabricated column. shear force function. The type and size of the trim strip 3 and/or the type and size of the trim plate are determined according to factors such as the type and size of the embedded section steel 2, which will not be repeated here.

The trim strip 3 and the trim plate can be welded horizontally with the embedded steel 2, as shown in Figure 1; they can also be welded at an oblique angle with the embedded steel 2, as shown in Figure 3; they can also be welded horizontally with the embedded steel 2, Weld at an oblique angle and use them together, as shown in Figure 4.

When producing a prefabricated column, firstly place each embedded section steel 2 according to the design position, then connect the adjacent embedded section steel 2 with tie bars 3 and/or tie plates, and finally cast the concrete main body 1 with the formwork.

In this embodiment, the traditional longitudinal bars 6 , the tie bars 3 and/or the tie plates are used to replace the stirrups that fix the longitudinal bars 6 by using the embedded steel 2 , which simplifies the production and installation process of the prefabricated column.

At the same time, the setting of the embedded section steel 2 simplifies the connection node structure of the prefabricated column and reduces the construction difficulty of the prefabricated column.

On the basis of the above embodiment, the equivalent section steel connector includes a pre-embedded steel member 4 arranged in the center of the concrete main body 1 , and a spiral stirrup 5 is arranged around the outer wall of the pre-embedded steel member 4 .

The cross-sectional shape of the embedded steel member 4 can be I-shaped as shown in FIG. 6 , and can be designed as any other geometric shape, as long as the embedded steel member 4 meets the design requirements of the prefabricated column.

In order to enhance the connection strength between the embedded steel member 4 and the concrete main body 1 , preferably, the inner wall surface of the embedded steel member 4 is provided with a plurality of studs 7 , and the studs 7 are evenly distributed along the length direction of the embedded steel member 4 . The size of the pegs 7 and the distance between two adjacent pegs 7 are determined according to actual architectural design requirements, and will not be repeated here.

The spiral stirrup 5 is bound around the outside of the embedded steel member 4 to enhance the shear bearing capacity of the prefabricated column and the connection performance between the embedded steel member and the concrete.

When producing a prefabricated column, firstly place the pre-embedded steel member 4 according to the design position, then bundle the spiral stirrup 5 outside the pre-embedded steel member 4, and finally cast the concrete main body 1 with the formwork.

In this embodiment, the embedded steel member 4 can replace part or all of the longitudinal bars of the prefabricated column, which not only ensures the structural strength and rigidity of the prefabricated column, but also reduces the construction difficulty when the prefabricated column is connected.

Preferably, please refer to FIG. 7 , in order to enhance the structural strength and rigidity of the connection of the prefabricated column, especially in order to enhance the rigidity and strength of the position corresponding to the connection between the prefabricated column and the beam, a ring can also be provided at the position corresponding to the connection between the concrete main body 1 and the beam. To the reinforcing plate 8 , the annular reinforcing plate 8 is provided with a first installation hole for installing the equivalent section steel connecting piece and a second installation hole for installing the longitudinal rib 6 .

The longitudinal rib 6 can be connected to the circumferential reinforcing plate 8 through a steel sleeve, or can be connected to the circumferential reinforcing plate 8 by plug welding;

The connection method between the circumferential reinforcing plate 8 and the beam is related to the type of the beam.

When producing the prefabricated column, first place and fix the equivalent section steel connector and the longitudinal reinforcement 6 according to the design position; In the second installation hole of the reinforcing plate 8, the equivalent section steel connector, the longitudinal reinforcement 6 and the annular reinforcing plate 8 are welded;

In addition to the above-mentioned equivalent steel concrete prefabricated column, the present invention also provides a construction method for an equivalent steel concrete prefabricated column suitable for the equivalent steel concrete prefabricated column disclosed in the above embodiments, including:

Step S1, assembling the equivalent section steel connector, pouring the prefabricated column upper column 01 and the prefabricated column lower column 02;

Step S2, hoisting the upper column 01 of the prefabricated column to just above the lower column 02 of the prefabricated column;

Step S3, welding the equivalent section steel connector of the upper column 01 of the prefabricated column and the equivalent section steel connector of the lower column 02 of the prefabricated column;

In step S4, a formwork is partially supported between the lower end surface of the prefabricated column upper column 01 and the upper end surface of the prefabricated column lower column 02, and concrete pouring is performed.

It should be noted that the prefabricated column upper column 01 and the prefabricated column lower column 02 may be prefabricated in advance in the factory before construction, or may be poured and maintained on site during construction.

Preferably, taking into account the longitudinal ribs 6 arranged in the prefabricated column, between step S2 and step S4 also includes:

Connect the longitudinal bars 6 of the upper column 01 of the prefabricated column and the longitudinal bars 6 of the lower column 02 of the prefabricated column, and configure the encrypted stirrups at the longitudinal bars 6 at the lower end of the prefabricated column upper column 01 and the longitudinal bars 6 at the upper end of the prefabricated column lower column 02 .

The longitudinal bars 6 can be connected by threaded steel bar sleeves, or by welding connection methods or other common steel bar connection methods.

In this implementation, the prefabricated column is divided into three sections: the prefabricated column upper column 01, the prefabricated column lower column 02 and the post-casting part. The prefabricated column upper column 01 and the prefabricated column lower column 02 can be prefabricated in the factory. The pouring part must be constructed on site, which simplifies the construction process, reduces the construction difficulty, and greatly improves the construction efficiency.

The prefabricated columns are welded and connected by equivalent steel connectors, and the welded part has a simple structure and is easy to operate, which effectively reduces the difficulty of welding and is conducive to ensuring the welding quality of the connection.

It should be noted that the first and second in the first installation hole and the second installation hole mentioned in this application document are only used to distinguish the difference of the positions, and do not limit the sequence.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The equivalent steel concrete prefabricated column provided by the present invention and the construction method thereof are described in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

An equivalent steel concrete prefabricated column is characterized in that it comprises a concrete main body (1) and an equivalent steel connecting piece, the equivalent steel connecting piece is arranged along the axis direction of the concrete main body (1), and the etc. The effect-shaped steel connecting piece protrudes from the end face of the concrete main body (1).
The equivalent steel concrete prefabricated column according to claim 1, characterized in that the equivalent steel connector comprises at least two embedded steels (2), and the space between the two adjacent embedded steels (2) is Provided with strips (3) and/or strips.
The equivalent steel-concrete prefabricated column according to claim 2, characterized in that, the inner wall surface of the embedded steel (2) is provided with a plurality of studs (7), and the studs (7) The buried section steel (2) is evenly distributed in the length direction.
The equivalent steel-concrete prefabricated column according to claim 2, characterized in that, the embedded steel (2) comprises T-shaped steel, C-shaped steel, I-beam, angle steel, steel pipe or composite steel plate weldment.
The equivalent steel concrete prefabricated column according to claim 1, characterized in that the equivalent steel connector comprises a pre-embedded steel member (4) arranged in the center of the concrete main body (1), the pre-embedded steel A spiral stirrup (5) is arranged around the outer side of the member (4).
The equivalent steel concrete prefabricated column according to claim 5, characterized in that, the outer wall surface of the embedded steel member (4) is provided with a plurality of studs (7), and the studs (7) are located in the The pre-embedded steel members (4) are evenly distributed in the length direction.
The equivalent steel-concrete prefabricated column according to any one of claims 1-6, characterized in that, a plurality of longitudinal bars (6) are arranged in the concrete main body (1), and the longitudinal bars (6) are arranged along the The concrete main body (1) is arranged in the axial direction.
A construction method for an equivalent steel concrete prefabricated column, used for the equivalent steel concrete prefabricated column of claims 1-7, characterized in that, comprising:

Assemble the equivalent section steel connectors, pour the prefabricated upper column (01) and the prefabricated lower column (02);

Lifting the prefabricated column upper column (01) to just above the prefabricated column lower column (02);

Welding the equivalent section steel connector of the prefabricated column upper column (01) and the equivalent section steel connector of the prefabricated column lower column (02);

Partial formwork is supported between the lower end face of the upper column (01) of the prefabricated column and the upper end face of the lower column (02) of the prefabricated column, and concrete is poured.
The method for constructing an equivalent steel-concrete prefabricated column according to claim 8, characterized in that, between the hoisting the upper column (01) of the prefabricated column and the partial formwork, comprising:

Connect the longitudinal ribs (6) of the upper column (01) of the prefabricated column and the longitudinal ribs (6) of the lower column (02) of the prefabricated column, and the longitudinal ribs at the lower end of the upper column (01) of the prefabricated column At the position (6) and the longitudinal reinforcement (6) at the upper end of the prefabricated column lower column (02), dense stirrups are arranged.