WO2021031373A1

WO2021031373A1 - Prefabricated bridge pier reinforcing bar connecting structure and construction method therefor

Info

Publication number: WO2021031373A1
Application number: PCT/CN2019/116075
Authority: WO
Inventors: 张建东; 刘朵; 侯福金; 熊辉; 周昆; 李涛; 杨耀辉
Original assignee: 苏交科集团股份有限公司; 南京工业大学
Priority date: 2019-08-22
Filing date: 2019-11-06
Publication date: 2021-02-25
Also published as: CN110453607A

Abstract

Disclosed are a prefabricated bridge pier reinforcing bar connecting structure and a construction method therefor, comprising a reinforcing bar embedded in a prefabricated concrete component, a grouting sleeve, steel chisels provided along the circumference on the inner wall of the grouting sleeve, a grouting hole provided at one end of the grouting sleeve, and a grout discharging hole provided at the other end. The sleeve is provided at the center position thereof with a limiting baffle provided and with rubber ring plugs at either end opening. The steel chisels are welded to the inner wall of the sleeve. The reinforcing bar is rugged on the surface; the shape of steel chisel connectors fits with same so as to form a mechanical bridging. During the installation of a prefabricated bridge pier, when the prefabricated component is aligned and in position, the reinforcing bar on the other end is inserted into the grouting sleeve, because of the mechanical connection between the steel chisel connectors and the reinforcing bar, the reinforcing bar cannot be pulled out easily, and at this time, a common grout can be injected from the grout injecting hole to complete the process. The reinforcing bar of the present application is provided with a force for mechanical engagement with the grouting sleeve, cannot be pulled out easily, and provides a certain degree of tensile and compressive capacity; therefore, the process can be completed with the common grout injected into the sleeve, and, construction accuracy and quality assurance are improved.

Description

Prefabricated bridge pier steel bar connecting structure and construction method thereof

Technical field

The application relates to the connection structure and construction method of sleeve grouting in the assembly process of prefabricated bridge piers, and belongs to the field of bridge prefabrication engineering construction.

Background technique

With the continuous development of domestic prefabricated bridges, more and more domestic scholars are conducting research on them. However, the core problem of prefabricated bridges lies in the connection and treatment of prefabricated segments. The sleeve grouting connection has High tensile strength, reliable connection and convenient construction, it is called the most widely used method of prefabricated bridge pier steel bar connection. In the past, the sleeve grouting connection was mainly that the steel bar was inserted into the grouting sleeve from both ends. Pour the expansive high-strength mortar to firmly combine the steel bar and the sleeve into one. However, the expansibility of the poured expansive high-strength mortar has always been difficult to control, and the quality is difficult to guarantee, and the expansive mortar is easily pulled out and damaged. Therefore, it is particularly necessary to develop a new type of steel connection method.

Summary of the invention

The purpose of this application is to overcome the difficulty of controlling the expansion of the expanded mortar in the grouting sleeve in the precast pier, the difficulty in quality assurance and the shortcomings of the previous sleeve grouting connection that the tensile capacity is not high, and to provide a precast bridge pier reinforcement connection method and For the construction method, this application adopts mechanical connection, which has better accuracy and quality assurance, effectively improves the tensile capacity of the grouting sleeve, and is reliable and convenient in construction.

The technical solution adopted in this application is: a prefabricated bridge pier steel bar connection structure, including steel bars, grouting sleeves, steel chisel bars, grouting holes, grouting holes, limit baffles and rubber ring plugs;

Precast concrete components are arranged in the grouting sleeve, and steel bars are embedded in the precast concrete components;

The inner wall of the grouting sleeve is provided with a steel chisel strip along the circumference, the upper end of the grouting sleeve is provided with a grout hole, and the lower end of the grouting sleeve is provided with a grout hole;

The steel chisel bar includes a steel backing plate, joints, springs and steel pins; the bottom of the joint and the steel backing plate have reserved holes, and the steel pins penetrate the reserved holes of the joint and the steel backing plate. One side is connected to the steel backing plate by a spring. The angle between the joint and the steel backing plate is 50-70 degrees, and both are inclined to the middle of the sleeve; this makes the joint deformable and facilitates the insertion of steel bars; the joint is at the center of the grouting sleeve As a boundary, the two ends are more distributed in the middle, and the joint shape matches the concave groove of the steel bar;

The center position of the grouting sleeve is provided with a limit baffle to control the insertion depth of the steel bar; the steel chisel is bounded by the limit baffle and is symmetrically distributed in the grouting sleeve; both ends of the grouting sleeve are equipped with rubber ring plugs.

Preferably, the distance between the grout hole and the grout hole from the proximal port is 15-30mm.

Preferably, the length of the steel chisel is less than half the length of the grouting sleeve.

Preferably, the rubber ring plug is in the shape of a truncated cone with a height of 18-25mm.

The construction method of the above-mentioned prefabricated bridge pier steel bar connection structure includes two parts, factory prefabrication and on-site installation;

Factory prefabrication: first weld the steel chisel bar to the inner wall of the grouting sleeve. After the welding is completed, insert the steel bar from the pre-embedded end of the grouting sleeve. In this process, because the steel chisel bar is on one side of the joint The springs and joints are deformable, and the steel bars are easy to insert; and the two ends are plugged with tapered rubber rings to prevent the concrete from flowing into the grouting sleeve when the concrete is poured. The grouting sleeve is pre-embedded at the end of the prefabricated bridge pier;

On-site installation: refers to the connection between the bridge pier and the cover beam or the bridge pier and the cap; after the component is straightened and positioned, the other end of the steel bar is inserted into the grouting sleeve. Due to the uneven surface of the steel bar, the joint and the steel bar surface match, and the joint and the steel bar A mechanical connection can be formed to ensure that the steel bars are not easily pulled out, and the bearing capacity of the grouting sleeve is improved; after the installation is completed, ordinary mortar is poured from the grouting hole, and the grouting hole and the grouting hole are blocked after the grouting is completed.

Beneficial effects: The connection structure of the grouting sleeve of the application is lapped by the joint of the steel chisel strip in the sleeve and the concave groove of the steel bar. It is very difficult to pull out the steel bar. In this way, ordinary mortar can be poured, which solves the problem of the previous connection structure of the grouting sleeve. The expansion of the medium grouting material is difficult to control, the consolidation quality is difficult to guarantee, and the steel bar is easy to pull out, and the steel chisel bar acts as a shear key. The steel bar must overcome the mechanical bite force between the steel bar and the steel chisel bar and the mortar. The friction force effectively improves the tensile strength of the grouting sleeve connection structure, and the construction is convenient and reliable.

Description of the drawings

Figure 1 is a schematic sectional view of a grouting sleeve of the application;

Figure 2 is a schematic diagram of the connection structure between steel bars and steel chisel bars of the application;

Figure 3 is a detailed view of the steel chisel bars of the application.

In the picture: 1. Reinforcement; 2. Grouting sleeve; 21. End tube section; 22. Middle tube section; 3. Steel chisel bar; 4. Grouting hole; 5. Grouting hole; 6. Limiting baffle; 7. Rubber ring plug; 301, steel backing plate; 302, joint; 303, spring; 304, steel pin.

detailed description

The application will be further explained below in conjunction with the drawings:

As shown in Figures 1, 2, and 3, a prefabricated bridge pier steel bar connection structure includes a steel bar 1 and a grouting sleeve 2 embedded in a prefabricated concrete member. A steel chisel 3 is provided along the circumference on the inner wall of the grouting sleeve. One end of the sleeve 2 is provided with a grout hole 4, the other end is provided with a grout hole 5, a limit baffle 6 at the center of the grout sleeve, and a rubber ring plug 7 at the ports at both ends.

The steel chisel bar includes a steel backing plate 301, a joint 302, a spring 303 and a steel pin 304. The bottom of the joint 302 and the steel backing plate have small reserved holes, and the steel pin 304 penetrates the joint and the steel The backing plate has a reserved hole, and the other side of the joint 302 is connected to the steel backing plate 301 through a spring 303. The angle between the joint 302 and the steel backing plate 301 is 50-70 degrees, and both are inclined toward the middle of the grouting sleeve 2. In this way, the joint 302 can be deformed to facilitate the insertion of the steel bar 1. In addition, the joint 302 is bounded by the center point of the grouting sleeve 2 with more ends and less distribution in the middle. Finally, the shape of the joint 302 matches the concave groove of the steel bar 1. Steel chisel bars can be machined.

The distance between the grout hole 4 and the grout hole 5 from the proximal port is 15-30mm.

The limit baffle 6 is to control the insertion depth of the steel bar.

The steel chisel bar 3 is symmetrically distributed in the grouting sleeve 2 with the limit baffle 6 as the boundary, and the length of the steel chisel bar 3 is less than half of the length of the grouting sleeve 2.

The rubber ring plug 7 has a frustum shape with a height of 18-25mm.

First weld the steel chisel 3 on the inner wall of the grouting sleeve. After the welding is completed, first insert the steel bar 1 from the embedded end of the grouting sleeve 2. In this process, since the spring 303 is provided on one side of the joint 302, The joint 302 is deformable, the steel bar 1 is easy to insert, and the steel bar 1 is not easy to pull out after being inserted, and the steel chisel 3 also acts as a shear key. The pulling out of the steel bar 1 needs to overcome the mechanical bite force and the joint 302. The friction force of the mortar on it can significantly improve the tensile strength of the grouting sleeve connection method. After the insertion is completed, the two ends are plugged with cone-shaped rubber ring plugs 7 to prevent the concrete from flowing into the grouting sleeve 2 when the concrete is poured. , The grouting sleeve 2 is embedded in the end of the prefabricated bridge pier. Then the other end of the steel bar 1 is straightened and positioned and inserted into the grouting sleeve 2, and the joint 302 is aligned and overlapped with the concave groove of the steel bar 1. After the installation is complete, pour ordinary mortar from the grouting hole 4, and block the grouting hole 4 and the grout hole 5 after the grouting is completed.

In this embodiment, the prefabricated bridge pier steel bar connection structure includes steel bar 1, grouting sleeve 2, steel chisel 3, grouting hole 4, grouting hole 5, limit baffle 6 and rubber ring plug 7; grouting sleeve 2 There are prefabricated concrete members, which are used to embed steel bars 1; the upper end of the grouting sleeve 2 is provided with a grouting hole 4, and the lower end of the grouting sleeve 2 is provided with a grouting hole 5; among them, the steel chisel 3 includes steel The backing plate 301, the joint 302, the spring 303 and the steel pin 304; one end of the joint 302 and the steel backing plate 301 have reserved holes, and the steel pin 304 penetrates through the preform of the joint 302 and the steel backing plate 301 Leave a hole. The other end of the joint 302 is connected to the steel backing plate 301 by a spring 303. The angle between the joint 302 and the steel backing plate 301 is 50° to 70°; along the axial direction of the grouting sleeve 2, the grouting sleeve 2 Including a middle tube section 22 and end tube sections 21 arranged on both sides of the middle tube section 22, both end tube sections 21 are provided with steel chisel bars 3; each steel chisel bar 3 has multiple joints 302, The free ends of the multiple joints 302 of each steel chisel 3 are inclined towards the middle tube section of the grouting sleeve 2; in the direction away from the middle tube section 22, the steel chisel 3 in each end tube section 21 is The gap between the two adjacent joints 302 gradually decreases; the shape of the joint 302 matches the concave groove of the steel bar 1.

In this embodiment, there are two steel bars 1 and the two steel bars 1 are inserted by two end tube sections 21 respectively; the prefabricated bridge pier steel bar connection structure also includes a limit baffle 6, which is arranged in the middle tube section 22 In order to limit the insertion depth of the reinforcing steel 1 inserted by each end tube section 21.

In this embodiment, the limiting baffle 6 is a strip plate, one end of the strip plate is connected to the inner wall of the middle tube section 22, and the other end of the strip plate extends toward the middle of the middle tube section 22.

In this embodiment, there are multiple limiting baffles 6, and multiple limiting baffles 6 are arranged at intervals along the circumferential direction of the middle cylinder section 22.

In this embodiment, the limiting baffle 6 is annular or circular, and the outer peripheral surface of the limiting baffle 6 is connected with the inner wall of the middle cylinder section 22.

In this embodiment, each end cylinder section 21 is provided with a plurality of steel chisel bars 3, and the plurality of steel chisel bars 3 in each end cylinder section 21 are arranged along the circumference of the end cylinder section 21.

In this embodiment, rubber ring plugs 7 are provided in the ports at both ends of the grouting sleeve 2.

In this embodiment, the distance between the hole center line of the grouting hole 4 and the upper end surface of the grouting sleeve 2 is m, and the radius of the grouting hole 4 is r; where, the value range of the difference between m and r It is 15mm to 30mm.

In this embodiment, the distance between the center line of the grout hole 5 and the lower end surface of the grouting sleeve 2 is n, and the radius of the grout hole 5 is a; where the difference between n and a is The range is 15mm to 30mm.

In this embodiment, the length of the steel chisel 3 is less than half of the length of the grouting sleeve 2.

The specific operation method of the above-mentioned prefabricated bridge pier steel bar connection structure:

First, the steel pipe is processed into the shape of the grouting sleeve 2 in the factory, and then drilled at 15-30mm at both ends of the port to form the grouting hole 4 and the grout hole 5, and then processed on the mold to form the limit baffle 6. Then the processed steel chisel 3 (including the steel backing plate 301, the joint 302, the spring 303 and the steel pin 304 are welded to the inner wall of the grouting sleeve 2 one by one. Then the rubber ring plug 7 is plugged at both ends, and then In the prefabrication plant, insert the bundled steel bar 1 into the embedded end of the grouting sleeve 2, and connect the grouting hole 4 and the grouting hole 5 to the PVC pipe to facilitate the filling and discharge of the grout. Then the concrete is poured. After the curing is completed, Transport to the site for installation.

When installing on site, clean up the debris in the grouting sleeve 2 first, and then straighten and position the components. After the positioning is completed, insert the other end of the steel bar 1 into the grouting sleeve 2, and insert the designed depth, then the concave surface of the steel bar 1 The slot then forms a mechanical connection with the steel chisel 3. The steel bar 1 is not easy to be pulled out. Subsequently, the mixed ordinary mortar is poured into the cavity of the grouting sleeve 2 from the grouting hole 4 through a small injection pump, and the grouting hole 4 and the grout hole 5 are blocked after the grouting is completed. In the past, the expansion mortar was poured. However, the expansion of the expansion mortar is difficult to control and the quality is difficult to guarantee. Therefore, the mechanical connection of the steel bar and the steel chisel joint is replaced with high accuracy and quality can be guaranteed. In this way, ordinary mortar can be poured.

The implementation of the patent of this application is described in detail above with reference to the drawings, but the patent of this application is not limited to the described implementations. For those of ordinary skill in the art, within the scope of the principles and technical ideas of the patent application, various changes, modifications, replacements and modifications to these embodiments still fall within the protection scope of the patent application.

Claims

A prefabricated bridge pier steel bar connection structure, which is characterized in that it comprises steel bars (1), grouting sleeves (2), steel chisel bars (3), grouting holes (4), grouting holes (5), and limiting baffles (6) and rubber ring plug (7);

The grouting sleeve (2) is provided with precast concrete components, and the precast concrete components are embedded with steel bars (1);

The inner wall of the grouting sleeve (2) is provided with a steel chisel (3) along the circumference, the upper end of the grouting sleeve (2) is provided with a grouting hole (4), and the lower end of the grouting sleeve (2) is provided with a grout discharge Hole(5);

The steel chisel bar (3) includes a steel backing plate (301), a joint (302), a spring (303) and a steel pin (304); the bottom of the joint (302) and the steel backing plate ( 301) has reserved holes, the steel pin (304) penetrates the reserved holes of the joint (302) and the steel backing plate (301), and the other side of the joint (302) is connected to the steel backing plate ( 301) is connected by a spring (303), the angle between the joint (302) and the steel backing plate (301) is 50-70 degrees, and both are inclined to the middle of the grouting sleeve (2); this makes the joint It can be deformed to facilitate the insertion of steel bars; the joint (302) is bounded by the center point of the grouting sleeve (2), and the two ends are more or less distributed in the middle, and the shape of the joint (302) matches the concave groove of the steel bar;

The center position of the grouting sleeve (2) is provided with a limit baffle (6) for controlling the insertion depth of the steel bar; the steel chisel (3) is bounded by the limit baffle (6), and the grouting sleeve (2) The inside is symmetrically distributed; both ends of the grouting sleeve (2) are provided with rubber ring plugs (7).
A prefabricated bridge pier steel bar connection structure according to claim 1, characterized in that the distance between the grouting hole (4) and the grout hole (5) from the proximal port is 15-30mm.
A prefabricated bridge pier steel bar connection structure according to claim 1, characterized in that: the length of the steel chisel (3) is less than half of the length of the grouting sleeve (2).
A prefabricated bridge pier steel bar connection structure according to claim 1, characterized in that the rubber ring plug (7) has a frustum shape, and the height of the rubber ring plug (7) is 18mm-25mm.
A prefabricated bridge pier steel bar connection structure, which is characterized in that:

The prefabricated bridge pier steel bar connection structure includes a steel bar (1), a grouting sleeve (2), a steel chisel (3), a grouting hole (4), a grout hole (5), a limit baffle (6) and rubber Ring plug (7); the grouting sleeve (2) is provided with prefabricated concrete members, and the prefabricated concrete members are used to embed the steel bars (1); the upper end of the grouting sleeve (2) is provided with grouting holes (4) The lower end of the grouting sleeve (2) is provided with a grout hole (5);

Wherein, the steel chisel bar (3) includes a steel backing plate (301), a joint (302), a spring (303) and a steel pin (304); one end of the joint (302) and the steel There are reserved holes on the backing plate (301), the steel pin (304) penetrates the reserved holes of the joint (302) and the steel backing plate (301), and the other end of the joint (302) is connected to The steel backing plate (301) is connected by a spring (303), and the angle between the joint (302) and the steel backing plate (301) is 50 to 70 degrees;

Along the axial direction of the grouting sleeve (2), the grouting sleeve (2) includes a middle cylinder section (22) and end cylinder sections (21) arranged on both sides of the middle cylinder section (22), two Each of the end cylinder sections (21) is provided with the steel chisel (3); each of the steel chisel (3) has a plurality of the joints (302), and each of the steel chisel The free ends of the multiple joints (302) of the strip (3) are all inclined toward the middle cylinder section of the grouting sleeve (2); in the direction away from the middle cylinder section (22), each of the end cylinder sections ( 21) The gap between the two adjacent joints (302) of each of the steel chisel bars (3) is gradually reduced;

The shape of the joint (302) is matched with the concave groove of the reinforcing bar (1).
The prefabricated bridge pier steel bar connection structure according to claim 5, characterized in that there are two steel bars (1), and the two steel bars (1) are inserted by the two end tube sections (21) respectively; The prefabricated bridge pier steel bar connection structure further includes a limit baffle (6), the limit baffle (6) is arranged in the middle tube section (22) to restrict the insertion of each end tube section (21) The insertion depth of the reinforcing bar (1).
The prefabricated bridge pier steel bar connection structure according to claim 6, characterized in that the limit baffle (6) is a strip plate, and one end of the strip plate is connected to the inner wall of the middle tube section (22) , The other end of the strip plate extends toward the middle of the middle cylinder section (22).
The prefabricated bridge pier steel bar connection structure according to claim 7, characterized in that there are multiple limiting baffles (6), and multiple limiting baffles (6) run along the middle tube section (22). The circumferential interval setting.
The prefabricated bridge pier steel bar connection structure according to claim 6, characterized in that the limiting baffle (6) is annular or circular, and the outer peripheral surface of the limiting baffle (6) is connected to the middle tube section (22) The inner wall is connected.
The prefabricated bridge pier steel bar connection structure according to claim 5, wherein a plurality of the steel chisel bars (3) are provided in each end tube section (21), and each end tube section (21) A plurality of said steel chisel bars (3) in) are arranged along the circumference in the end cylinder section (21).
The prefabricated bridge pier steel bar connection structure according to claim 5, characterized in that the ports at both ends of the grouting sleeve (2) are equipped with rubber ring plugs (7).
The prefabricated bridge pier reinforcement connection structure according to claim 5, characterized in that the distance between the hole center line of the grouting hole (4) and the upper end surface of the grouting sleeve (2) is m, and the grouting The radius of the hole (4) is r; where the value of the difference between m and r ranges from 15mm to 30mm.
The prefabricated bridge pier steel bar connection structure according to claim 5, characterized in that the distance n between the hole center line of the grouting hole (5) and the lower end surface of the grouting sleeve (2), the row The radius of the grout hole (5) is a; where the value of the difference between n and a ranges from 15mm to 30mm.
The prefabricated bridge pier steel bar connection structure according to claim 5, characterized in that the length of the steel chisel strip (3) is less than half of the length of the grouting sleeve (2).
The construction method of prefabricated bridge pier steel bar connection structure according to any one of claims 1 to 14, characterized in that: the construction method includes factory prefabrication and on-site installation;

Factory prefabrication: first weld the steel chisel (3) on the inner wall of the grouting sleeve (2), and after the welding is completed, first insert a steel bar (1) from the embedded end of the grouting sleeve (2) In this process, since one side of the joint (302) of the steel chisel strip (3) is provided with a spring (303), the joint (302) can be deformed to facilitate the insertion of the steel bar (1); and Both ends of the grouting sleeve (2) are plugged with tapered rubber ring plugs (7) to prevent the concrete from flowing into the grouting sleeve (2) when the concrete is poured, and the grouting sleeve (2) is pre-buried in The ends of prefabricated bridge pier components;

On-site installation: refers to the connection between the bridge pier and the cover beam or the bridge pier and the cap; after the component is straightened and positioned, insert another steel bar (1) into the grouting sleeve (2). Due to the uneven surface of the steel bar (1), the joint (302) is matched with the surface of the steel bar (1), the joint (302) and the steel bar (1) can form a mechanical connection, which ensures that the steel bar (1) is not easily pulled out and improves the bearing capacity of the grouting sleeve (2) ; After the installation is completed, pour ordinary mortar from the grouting hole (4), and block the grouting hole (4) and the grout hole (5) after the grouting is completed.