A steel sleeve for grouting connection of steel bars that can be repaired after high temperature

Abstract

The invention discloses a steel sleeve for grouting connection of steel bars which can be repaired after high temperature. The steel sleeve is formed by splicing two semi-cylinders, and is provided with a grouting port and a grouting port. The steel bars to be connected are inserted into the steel sleeve from both ends respectively, and both ends of the steel sleeve are provided with closed rubber rings. A through hole is provided on the outer wall of the steel sleeve, and the through hole is sealed with a rubber plug.

Description

Technical Field

[0001] The invention relates to the technical field of construction, in particular to a steel sleeve for connecting steel bars by grouting which can be repaired after high temperature. Background Art

[0002] The grouting sleeve is a combination of a specially processed sleeve, matching grouting material and steel bars. When connecting the steel bars, the fast-hardening non-shrinkage grouting material is injected, and the steel bars and sleeves are connected by the bonding and biting action between the materials. The sleeve grouting joint has the advantages of reliable performance, wide applicability, and easy installation. It is widely used as a connection method for steel bars in prefabricated structures. There are many types of sleeve grouting joints at home and abroad, and their forms are diverse. According to the form of the sleeve, it can be generally divided into two categories: full sleeve grouting joints and half sleeve grouting joints. The outer walls of these two types of sleeves are all in the form of an integral closed form. The steel bar grouting sleeve connection technology is widely used in prefabricated structures, but the existing steel bar sleeves are all integral, and once grouting is completed, they are not repairable. The grouting material in the steel bar grouting sleeve connection is high in strength and has a high bursting property at high temperatures. Moreover, because the steel sleeve is closed, when it is subjected to high temperature, the water vapor generated by the grouting material cannot be discharged in time, which aggravates the high-temperature bursting property of the grouting material. Summary of the invention

[0003] The purpose of the present invention is to provide a steel sleeve for grouting connection of steel bars which can be repaired after high temperature in view of the defects of the prior art.

[0004] The present invention is achieved by adopting the following technical solutions:

[0005] A steel sleeve for grouting a steel bar that can be repaired after high temperature, characterized in that the steel sleeve is composed of two semi-cylinders, and a grouting port and a grouting port are provided on the steel sleeve;

[0006] The steel bars to be connected are respectively inserted into the steel sleeve from both ends of the steel sleeve, and both ends of the steel sleeve are provided with closed rubber rings; a through hole is provided on the outer wall of the steel sleeve, and the through hole is sealed with a rubber plug.

[0007] Furthermore, the joint between the two semi-cylinders is evenly provided with bolt holes that match each other, and the two semi-cylinders are fixed by bolts.

[0008] Furthermore, a bolt hole thickening portion is provided on the inner wall of the semi-cylinder located on the inner side of the joint to provide sufficient threads.

[0009] Furthermore, protruding ribs are evenly arranged inside the steel sleeve.

[0010] Furthermore, a reinforcement limiting baffle is provided in the middle of the steel sleeve.

[0011] Furthermore, the through hole is located in the middle of the steel sleeve.

[0012] Furthermore, the through hole is wedge-shaped, with a larger inner radius of the hole wall and a smaller outer radius, and the shape of the rubber plug is consistent with the shape of the through hole.

[0013] Furthermore, a steel sleeve for connecting steel bars by grouting which can be repaired after high temperature is provided, and a method for using the steel sleeve comprises the following steps:

[0014] Step 1) Assemble the two semi-cylinders, insert a rubber plug into the through hole before assembling; fix the two semi-cylinders with bolts to form a steel sleeve;

[0015] Step 2) Insert the sealing rubber rings into the openings at both ends of the steel sleeve;

[0016] Step 3) Insert the steel bars to be connected into the steel sleeve from both ends of the steel sleeve respectively, and the insertion depth is limited by the steel bar limit baffle;

[0017] Step 4) pour grout through the grouting port to connect the two steel bars;

[0018] Step 5) After the concrete component is subjected to high temperature, the rubber plug at the through hole melts, allowing the water vapor to be discharged, reducing the high-temperature bursting of the grouting material;

[0019] Step 6) During repair, chisel away the concrete on the surface of the component after high temperature to expose the steel sleeve, remove the connecting bolts on the steel sleeve, separate the two semicircular sleeves, clean the residual grouting material on the steel bars and sleeves, reassemble and grout, and complete the steel bar grouting sleeve connection repair process.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The assembled steel grouting sleeve structure is adopted to make it repairable. Several wedge-shaped holes are left on the steel sleeve to provide a channel for the discharge of water vapor under high temperature and reduce the high-temperature bursting of the grouting material in the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the overall appearance diagram of Example 1;

[0023] Figure 2 It is the front view of the half sleeve;

[0024] Figure 3 It is the axonometric drawing of half casing;

[0025] Figure 4 It is a rubber plug for the air hole of the sleeve;

[0026] Figure 5 The rubber rings at both ends of the sleeve;

[0027] Figure 6It is a schematic diagram of sleeve plugging;

[0028] Figure 7 This is the cross-sectional view of the steel bar connection;

[0029] Figure 8 This is the appearance diagram of the steel bar connection. DETAILED DESCRIPTION

[0030] like Figure 1-6 The steel sleeve is a steel sleeve for grouting connection that can be repaired after high temperature. The steel sleeve is composed of a left semi-circular cylinder 3 and a right semi-circular cylinder 6. The steel sleeve has a grouting port 2 at the bottom and a grouting port 1 at the top. The steel bars 10 to be connected are inserted into the steel sleeve from both ends of the steel sleeve. Both ends of the steel sleeve are provided with closed rubber rings 5. The shape of the rubber ring is as follows: Figure 5 The outer wall of the steel sleeve is provided with a wedge-shaped through hole 7, which is located in the middle of the steel sleeve, with a large inner radius and a small outer radius. The through hole 7 is sealed with a rubber plug. Figure 4 As shown, the shape of the rubber plug is consistent with the shape of the through hole. The joint between the two semi-cylinders is evenly provided with bolt holes 4 that match each other, and the two semi-cylinders are fixed by bolts. The bolt hole 4 located on the inner wall of the semi-cylinder on the inner side of the joint is provided with a bolt hole thickening portion 9. When the left and right half sleeves are connected by bolts, the bolts in the bolt hole thickening portion 9 have sufficient threads to enter the other half sleeve, thereby ensuring sufficient connection reliability. In order to enhance the bonding between the grouting material and the sleeve, a steel bar section is welded inside the sleeve to form a convex rib block 8. In order to limit the length of the steel bar extending into the sleeve, a steel bar limit baffle 11 is provided.

[0031] The method of using this steel sleeve includes the following steps:

[0032] Step 1) Assemble the two semi-cylinders, insert a rubber plug into the through hole before assembling; fix the two semi-cylinders with bolts to form a steel sleeve;

[0033] Step 2) Insert the sealing rubber rings into the openings at both ends of the steel sleeve;

[0034] Step 3) Insert the steel bars to be connected into the steel sleeve from both ends of the steel sleeve respectively, and the insertion depth is limited by the steel bar limit baffle;

[0035] Step 4) pour grout through the grouting port to connect the two steel bars;

[0036] Step 5) After the concrete component is subjected to high temperature, the rubber plug at the through hole melts, allowing the water vapor to be discharged, reducing the high-temperature bursting of the grouting material;

[0037] Step 6) During repair, chisel away the concrete on the surface of the component after high temperature to expose the steel sleeve, remove the connecting bolts on the steel sleeve, separate the two semicircular sleeves, clean the residual grouting material on the steel bars and sleeves, reassemble and grout, and complete the steel bar grouting sleeve connection repair process.

[0038] Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A steel sleeve for grouting a steel bar that can be repaired after high temperature, characterized in that: The steel sleeve is composed of two semi-cylinders, and is provided with a grouting port and a grouting port; the steel bars to be connected are respectively inserted into the steel sleeve from both ends, and both ends of the steel sleeve are provided with closed rubber rings; a through hole is provided on the outer wall of the steel sleeve, and the through hole is sealed with a rubber plug; The through hole is located in the middle of the steel sleeve; the through hole is wedge-shaped, with a large inner radius and a small outer radius of the hole wall, and the shape of the rubber plug is consistent with the shape of the through hole; During construction, grout is poured through the grouting port to connect the two steel bars; When the concrete component is exposed to high temperature, the rubber plug at the through hole melts, allowing the water vapor to be discharged, reducing the high-temperature bursting of the grouting material; During the repair, the concrete on the surface of the component after high temperature is chiseled off to expose the steel sleeve, the connecting bolts on the steel sleeve are removed, the two semicircular sleeves are separated, the residual grouting material on the steel bars and sleeves is cleaned, and the components are reassembled and grouted to complete the steel bar grouting and sleeve connection repair process.

2. A steel sleeve for grouting a steel bar that can be repaired after high temperature as claimed in claim 1, characterized in that: The joint between the two semi-cylinders is evenly provided with bolt holes that match each other, and the two semi-cylinders are fixed by bolts.

3. A steel sleeve for grouting a steel bar that can be repaired after high temperature as claimed in claim 1, characterized in that: A bolt hole thickening portion is provided on the inner wall of the semi-cylinder located on the inner side of the joint, so as to provide sufficient threads.

4. A steel sleeve for grouting a steel bar that can be repaired after high temperature as claimed in claim 1, characterized in that: The steel sleeve is evenly provided with protruding rib blocks inside.

5. The high temperature repairable steel sleeve for grouting connection of steel bars as claimed in claim 1, characterized in that: A reinforcement limiting baffle is provided in the middle of the steel sleeve.

6. A method for using a steel sleeve for grouting a steel bar that can be repaired after high temperature as claimed in claim 1, characterized in that: The method for using the steel sleeve comprises the following steps: Step 1) Assemble the two semi-cylinders, insert a rubber plug into the through hole before assembling; fix the two semi-cylinders with bolts to form a steel sleeve; Step 2) Insert the sealing rubber rings into the openings at both ends of the steel sleeve; Step 3) Insert the steel bars to be connected into the steel sleeve from both ends of the steel sleeve respectively, and the insertion depth is limited by the steel bar limit baffle; Step 4) pour grout through the grouting port to connect the two steel bars; Step 5) After the concrete component is subjected to high temperature, the rubber plug at the through hole melts, allowing the water vapor to be discharged, reducing the high-temperature bursting of the grouting material; Step 6) During repair, chisel away the concrete on the surface of the component after high temperature to expose the steel sleeve, remove the connecting bolts on the steel sleeve, separate the two semicircular sleeves, clean the residual grouting material on the steel bars and sleeves, reassemble and grout, and complete the steel bar grouting sleeve connection repair process.

Images