Hydraulic anchoring steel bar connection sleeve and connection method

Abstract

The present invention relates to the technical field of precast concrete component construction, and in particular to a hydraulic anchoring steel bar connection sleeve and connection method. The present application uses two sleeves connected by threads, and both ends are fixedly connected to the steel bars by threads. By injecting oil and applying pressure in the first sleeve, the piston in the second sleeve is pushed to move from the rear end to the front end, forming a thrust on the end of the wedge-shaped clip. The wedge-shaped clip gradually tightens as it moves outward along the front end, and bites and fixes the steel bar inserted into the front end. When the steel bar is subjected to external tension, it is fixed with the second internal thread on the wedge-shaped clip, which will drive the wedge-shaped clip to move outward, and the inner diameter of the front end gradually shrinks outward. Therefore, when the steel bar to be connected is subjected to external force, the bite force will be increased, forming a reliable steel bar fixation, thereby achieving the goal of eliminating the need for sleeve grouting to achieve steel bar connection and tightening, and improving the tightness of the sleeve steel bar connection.

Description

Technical Field

[0001] The present invention relates to the technical field of precast concrete component construction, and in particular to a hydraulic anchoring type steel bar connecting sleeve and a connecting method. Background Art

[0002] At present, the steel sleeve grouting connection technology is widely used for connecting steel bars in vertical and horizontal components at construction sites. The principle is to insert the ribbed steel bars into the sleeve, and then inject high-strength, early-strength, slightly expandable cement-based grouting material into the sleeve to fill the internal gaps. After the grouting material hardens, it will tightly mesh with the transverse ribs of the steel bars and the grooves or convex ribs on the inner wall of the sleeve to achieve stress transfer. However, the steel sleeve grouting connection joint is prone to fullness problems. During the prefabrication and construction process, there may be gaps, impurities, poor quality of cement-based grouting, etc., which will lead to substandard fullness. Moreover, as long as cement-based grouting material is used for grouting in the sleeve, there are often structural safety hazards caused by unqualified grouting quality and non-standard construction. The invisibility of the grouting sleeve after pouring is completed, the difficulty of detection and low accuracy are also problems caused by the grouting of the steel sleeve grouting connection.

[0003] Chinese invention patent CN114108955B discloses a steel bar connection grouting sleeve. By setting a first threaded tube, a fixing plate, an elastic splint, a positioning tube and a positioning ring, after the steel bar body is inserted into the interior of the sleeve, the rotating ring is rotated, and the rotating ring drives the positioning tube to rotate. The positioning tube is threadedly connected to the inner wall of the first threaded tube. The positioning tube drives the positioning ring to press against the elastic splint, and the elastic splint is pressed against the surface of the steel bar body. The elastic splints on both sides of the steel bar body clamp the steel bar body and fix the position of the steel bar body. However, the sealing connection method adopted by the sleeve still uses cement slurry to fill the sleeve, and uses the internal blocking block and positioning ring for blocking. It cannot completely solve the connection strength and sealing strength problems caused by the need for grouting of the steel bar sleeve. Summary of the Invention

[0004] In order to solve the problems in the above-mentioned background technology, the present application provides a hydraulic anchoring precast concrete component steel bar connection sleeve, which can use the method of oil injection and pressurization to avoid sleeve grouting to achieve steel bar connection and tightening, improve the tightness of the sleeve steel bar connection, form a reliable anchor connection, and reduce construction difficulty.

[0005] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0006] A hydraulic anchoring steel bar connection sleeve, the sleeve is divided into a first sleeve and a second sleeve, one end of the first sleeve is screwed into the second sleeve to form a threaded fastening connection, and the other end of the first sleeve is provided with a first internal thread for fixed connection to a precast concrete steel bar, wherein:

[0007] The first sleeve is provided with an oil filling hole and an exhaust hole, both of which are connected to the channel in the first sleeve, and the oil filling hole and the exhaust hole are both provided with oil seals;

[0008] A circumferential groove is provided in the second sleeve, and a limiting clamp ring is provided in the groove to divide the second sleeve into a front end and a rear end, wherein the inner diameter of the sleeve at the front end gradually shrinks outward, and the inner diameter of the rear end remains unchanged, and a piston is accommodated therein, and the piston transitionally fits and moves in the rear end; at least two wedge-shaped clips are provided along the circumference on the inner wall of the front end, and a second internal thread is provided on the opposite curved surfaces of the wedge-shaped clips for fixing and connecting the inserted steel bars to be connected, and the front end of the piston has a top support portion, which pushes the wedge-shaped clips to tighten and bite the inserted steel bars to be connected when the piston moves from the rear end to the front end.

[0009] Compared with the prior art, the present application uses two sleeves connected by threads, and both ends are fixedly connected to the steel bars by threads. By injecting oil and pressurizing in the first sleeve, the piston in the second sleeve is pushed to move from the rear end to the front end, forming a thrust on the end of the wedge-shaped clip. The wedge-shaped clip gradually tightens as it moves outward along the front end, and the steel bar inserted into the front end is bitten and fixed. When the steel bar is subjected to external tension, it is fixed with the second internal thread on the wedge-shaped clip, which will drive the wedge-shaped clip to move outward, and the inner diameter of the front end gradually shrinks outward. Therefore, when the connected steel bar is subjected to external force, the bite force will increase, forming a reliable steel bar fixation, thereby achieving the goal of eliminating the need for sleeve grouting to achieve steel bar connection and tightening, and improving the tightness of the sleeve steel bar connection.

[0010] Preferably, an airtight member is provided at the connection between the first sleeve and the second sleeve. Based on the above solution, after the first sleeve is screwed into the second sleeve to form a threaded fixed connection, the airtight member can be used to seal and prevent leakage, which can further improve the airtightness of the oil pressure in the sleeve and make the connection more secure.

[0011] Specifically, the contact surfaces of the wedge-shaped buckle and the inner wall of the front sleeve are complementary inclined surfaces, so that the cylindrical channel formed between the opposing curved surfaces of the wedge-shaped buckle is coaxial with the center of the sleeve. Due to the complementary contact surfaces between the wedge-shaped buckle and the front inner wall, when the wedge-shaped buckle is moved outward from the sleeve by external force, the diameter formed between the wedge-shaped buckle shrinks faster, thereby tightening the connection between the sleeve and the steel bar.

[0012] Furthermore, the supporting portion is a hollow cylinder, integrally formed with the piston, with a circular cross-section. Its inner diameter is larger than the rebar to be connected, and its outer diameter is smaller than the inner diameter of the retaining ring. When the piston moves, it pushes against the ends of the wedge-shaped clips through the retaining ring. As the piston moves from the rear end to the front end, the hollow cylinder with a circular cross-section simultaneously supports and pushes all the wedge-shaped clips distributed around the inner wall of the front end outward, tightening the engagement with the rebar.

[0013] Furthermore, the limiting clamp comprises a clamp body, a clamp opening, and limiting portions. The limiting portions are equal in number and correspond to the wedge-shaped clamp, and their shape is identical to the cross-section of the wedge-shaped clamp. When the steel bar to be connected is compressed and drives the wedge-shaped clamp from the front end to the rear end, the limiting clamp can block the moving wedge-shaped clamp, causing it to be restrained on the inner wall of the front end.

[0014] Furthermore, the oil filling hole and the exhaust hole are disposed on the same side of the first sleeve, the oil filling hole extending radially outward from the first sleeve to form an oil filling pipe, and the exhaust hole extending radially outward from the first sleeve to form an exhaust pipe, wherein the ends of the oil filling pipe and the exhaust pipe are both threadedly connected with oil seals. Integrating the oil filling pipe and the exhaust pipe with the first sleeve facilitates maintaining airtightness when using an oiler to inject oil into the first sleeve and apply pressure. Providing oil seals at the ends of the oil filling pipe and the exhaust pipe provides a better effect than providing oil seals on the oil filling hole and the exhaust hole.

[0015] Furthermore, the oil seal comprises a one-way valve and a valve cap, which are connected by threads. The one-way valve comprises a valve body, a spring, and a sealing member. Connecting threads are provided at both ends of the valve body. Two retaining rings are fixedly mounted in the middle of the valve body, accommodating the spring in the middle of the retaining rings. A sealing member is provided between the retaining rings at the lower ends and the springs. The sealing member comprises an integrally formed sealing disk and a sealing rod, wherein the diameter of the sealing disk is larger than the inner diameter of the retaining rings. The provision of the one-way valve effectively prevents the sleeve from leaking oil after injection, providing a more reliable and durable fixed connection for the steel bar.

[0016] Furthermore, the piston is made of cast iron, and its surface roughness Ra is less than 1.2.

[0017] Furthermore, the airtight component is a water-stop valve, which is arranged at the end of the threaded connection between the second sleeve and the first sleeve.

[0018] A method for connecting a hydraulic anchoring type steel bar connecting sleeve, comprising the following steps:

[0019] S1: Grind and thread the longitudinal steel bars on the concrete member, and fasten them with the first sleeve by threading;

[0020] S2: Install three wedge-shaped clips in the inner diameter of the front sleeve and install two limit rings into the groove to limit the displacement of the wedge-shaped clips;

[0021] S3: Install the piston into the rear end of the second sleeve with the supporting portion facing the front end; screw one end of the first sleeve into the second sleeve to form a threaded fastening connection, completing the overall assembly of the sleeve;

[0022] S4: After grinding and threading the steel bars to be connected, insert them into the threaded holes formed by the wedge-shaped buckles at the front end;

[0023] S5: Use a press to inject oil into the sleeve from the oil filling hole. When the oil flows out from the exhaust hole, the air in the sleeve is discharged, and the exhaust hole is sealed with an oil seal.

[0024] S6: Continue to pressurize and inject oil so that the top support part pushes the wedge-shaped buckle to tighten. After the steel bars to be connected are tightened to a certain standard, seal the oil injection hole to ensure the airtightness of the entire sleeve.

[0025] The beneficial effects of the present invention are as follows: the overall structure of the connecting sleeve of the present invention is simple, with few accessories, and the connection method is to fix the two ends with threads. The source of its tightening pressure is oil pressure, which is more controllable than the quality of grouting in traditional sleeves. It eliminates the problems of grouting quality, operation proficiency, invisible detection difficulties, etc. caused by grouting, and can form a reliable oil pressure anchoring structure to tighten the connection between the steel bar and the sleeve, reducing the construction difficulty. It can be widely used and promoted in various scenarios of steel bar connection of concrete components. At the same time, the connecting sleeve reduces the difficulty of construction quality inspection and reduces the workload of inspectors. Inspectors only need to carry a pressure gauge to detect the injected oil pressure to realize joint quality inspection. In addition, if the joint connection performance decreases during later use, it is only necessary to replenish the oil in time and increase the oil pressure, thereby avoiding the problem of maintenance and replacement of existing grouting connecting sleeves. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a sectional view of the overall assembly of an embodiment of the present invention;

[0027] Figure 2 This is an overall exploded sectional view of an embodiment of the present invention;

[0028] Figure 3 This is a diagram showing the connection between the wedge-shaped buckle and the steel bars to be connected in an embodiment of the present invention;

[0029] Figure 4 In the embodiment of the present invention Figure 1 A cross-sectional view of part 1-1;

[0030] Figure 5 In the embodiment of the present invention Figure 1 A cross-sectional view of part 2-2;

[0031] Figure 6 In the embodiment of the present invention Figure 1 Cross-sectional view of section 3-3;

[0032] Figure 7 2 is a cross-sectional view of the overall structure of the oil seal in an embodiment of the present invention.

[0033] In the figure, marks 1-prefabricated steel bar, 2-steel bar to be connected, 3-first sleeve, 301-first internal thread, 302-first external thread, 303-oil filling pipe, 304-exhaust pipe, 305-sleeve channel, 4-second sleeve, 401-third internal thread, 402-groove, 5-oil seal, 501-valve body, 502-valve body thread, 503-spring, 504-sealing piece, 5041-sealing disk, 5042-sealing rod, 505-retaining ring, 506-valve bonnet, 6-piston, 601-piston disk, 602-support part, 7-limiting clamping ring, 701-clamping ring body, 702-limiting part, 703-clamping ring opening, 8-wedge-shaped buckle, 801-second internal thread, 9-water stop valve. DETAILED DESCRIPTION

[0034] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. The components of the present invention generally described and shown in the drawings herein can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of the present invention.

[0035] Example

[0036] In order to solve the existing problems of concrete component steel sleeve connection, which is often tightened by pouring concrete slurry, which is easy to cause poor pouring quality due to insufficient slurry quality, non-standard construction, loose steel connection, and high difficulty in invisible detection, please refer to Figure 1-2 Overall cross-sectional view of the sleeve and Figure 3The present invention proposes a hydraulic anchoring steel bar connection sleeve, comprising a first sleeve 3 and a second sleeve 4 connected by threads, specifically, the first external thread 302 at one end of the first sleeve 3 is screwed into the third internal thread 401 at one end of the second sleeve 4 for tightening, wherein the other end of the first sleeve 3 is provided with a first internal thread 301 for threaded fastening with the prefabricated steel bar 1 in the concrete component, wherein the second sleeve 4 is radially provided with a groove 402, and a limiting clamping ring 7 is provided in the groove 402 to divide the second sleeve 4 into a front end and a rear end, wherein the inner diameter of the sleeve at the front end gradually shrinks outward, and the inner diameter of the rear end remains unchanged, and a piston 6 is accommodated in the rear end, wherein the material of the piston 6 is cast iron, and the surface roughness Ra of the piston 6 is 1.0, and the piston 6 includes a piston disc 601 and a top support portion 602, The piston disc 601 can transition and move in the rear end; three wedge-shaped clips 8 are arranged along the circumference on the inner wall of the front end, and a second internal thread 801 is provided on the opposite curved surface of the wedge-shaped clip 8, which is used to fix the inserted steel bar 2 to be connected, wherein the top support part 602 at the front of the piston 6 is a hollow cylinder, which is integrally formed with the piston 6, and its cross-section is annular, and its inner diameter is larger than the steel bar to be connected. The outer diameter of the ring is smaller than the inner diameter of the limiting clip 7. When the piston 6 moves, the limiting clip 7 contacts and pushes the end of the wedge-shaped clip 8, so that when the piston moves from the rear end to the front end, the wedge-shaped clip 7 is pushed to tighten the inserted steel bar to be connected. The first sleeve 3 is provided with an oil filling pipe 303 and an exhaust pipe 304 integrally formed with the sleeve body on the same side, and both are connected to the sleeve channel 305.

[0037] The present invention adopts two sleeves connected by threads, and both ends are respectively fixedly connected to the steel bars by threads. By injecting oil and pressurizing in the first sleeve 3, the piston 6 in the second sleeve 4 is pushed to move from the rear end to the front end, forming a thrust on the end of the wedge-shaped clip 8. The wedge-shaped clip 8 is gradually tightened when it moves outward along the front end, and the steel bar 2 to be connected inserted into the front end is bitten and fixed. When the steel bar is subjected to external tension, it is fixed with the second internal thread 801 on the wedge-shaped clip 8, which will drive the wedge-shaped clip 8 to move outward. The inner diameter of the front end is gradually contracted outward, so when the steel bar 2 to be connected is subjected to external force, the biting force will be increased, forming a reliable steel bar fixation, thereby achieving the goal of eliminating the sleeve grouting to achieve the steel bar connection and tightening, and improving the tightness of the sleeve steel bar connection. At the same time, the hollow cylinder with an annular cross section can be pushed outward together with all the wedge-shaped clips 8 distributed on the inner wall of the front end when the piston 6 moves from the rear end to the front end, tightening the biting with the steel bar 2 to be connected.

[0038] See also Figure 4-6The cross-sectional views at various positions show that the contact surfaces between the wedge-shaped buckle 8 of the present invention and the inner wall of the front sleeve are complementary inclined surfaces, so that the cylindrical channel formed between the opposite curved surfaces of the wedge-shaped buckle 8 is coaxial with the center of the sleeve. The contact surfaces between the wedge-shaped buckle 8 and the front inner wall are complementary, so that when the wedge-shaped buckle 8 is moved out of the sleeve by external force, the caliber formed between the wedge-shaped buckles 8 shrinks faster, making the connection between the second sleeve 4 and the steel bar to be connected tighter. The limiting snap ring 7 comprises a snap ring body 701, a snap ring opening 703 and a limiting portion 702, wherein the number of the limiting portions 702 is the same as and corresponds to the wedge-shaped snap ring 8, and the shape thereof is the same as the cross-section of the wedge-shaped snap ring 8. Two limiting snap rings 7 are provided in the groove 402, and both are rotatably provided in the groove 402. The snap ring opening 703 can be squeezed and deformed to a certain extent when the limiting snap ring 7 is installed in the groove 402, thereby reducing the radius of the limiting snap ring 7. After the limiting snap ring 7 is installed, one of the two is rotated to form a support therebetween, thereby limiting the wedge-shaped snap ring 8. When the steel bar 2 to be connected is pressed and drives the wedge-shaped snap ring 8 to move from the front end to the rear end, the limiting snap ring 7 can block the moving wedge-shaped snap ring 8, so that the wedge-shaped snap ring 8 is restricted to the front inner wall. A water stop valve 9 is provided at the connection between the first sleeve 3 and the second sleeve 4, which is provided at the end of the threaded connection between the second sleeve 4 and the first sleeve 3. Based on the above solution, after the first sleeve 3 is screwed into the second sleeve 4 to form a threaded fixed connection, the water stop valve 9 can be used to seal and stop leakage, which can further improve the air tightness of the oil pressure in the sleeve and make the connection effect tighter.

[0039] See also Figure 7 The overall structure of the oil seal is shown in a cross-sectional view. The oil seal includes a one-way valve and a valve cap 506, which are connected by threads. The one-way valve includes a valve body 501, a spring 503, and a blocking member 504. Connecting threads are provided at both ends of the valve body 501. Two retaining rings 505 are fixedly mounted in the middle of the valve body 501. The retaining rings 505 accommodate the spring 503 in the middle. The blocking member 504 is located between the retaining rings 505 and the spring 503 at the lower ends. The blocking member 504 includes an integrally formed blocking disk 5041 and a blocking rod 5042. The diameter of the blocking disk 5041 is larger than the inner diameter of the retaining ring 505. The provision of the one-way valve effectively prevents the sleeve from leaking oil, providing a more reliable and durable connection for the rebar.

[0040] The present invention also provides a method for connecting a hydraulic anchoring type steel bar connecting sleeve, the steps of which include:

[0041] S1: Grind and thread the longitudinal prefabricated steel bars on the concrete member, and fasten them to the first sleeve through threaded connection;

[0042] S2: Install three wedge-shaped clips in the inner diameter of the front sleeve and install two limit rings into the groove to limit the displacement of the wedge-shaped clips;

[0043] S3: Install the piston into the rear end of the second sleeve with the supporting portion facing the front end; screw one end of the first sleeve into the second sleeve to form a threaded fastening connection, completing the overall assembly of the sleeve;

[0044] S4: After grinding and threading the steel bars to be connected, insert them into the second internal thread formed by the wedge-shaped buckle at the front end;

[0045] S5: Use a press to inject oil from the oil filling pipe into the sleeve. When the oil flows out of the exhaust pipe, the air in the sleeve is discharged, and the exhaust pipe is sealed with an oil seal.

[0046] S6: Continue to pressurize the oil injection so that the top support part pushes the wedge-shaped buckle to tighten. After the steel bars to be connected are tightened to a certain standard, seal the oil injection pipe and screw on the valve cap to ensure the airtightness of the entire sleeve.

[0047] The connecting sleeve of the present invention has a simple overall structure, few accessories, and a connection method of fixing the two ends with threads. The source of its tightening pressure is oil pressure, which is more controllable than the quality of grouting in traditional sleeves. It eliminates the problems of grouting quality, operation proficiency, and invisible detection difficulties caused by grouting. It can form a reliable oil pressure anchoring structure, so that the connection between the steel bar and the sleeve is tightened, which reduces the construction difficulty and can be widely used in various scenarios of steel bar connection of concrete components. At the same time, the connecting sleeve reduces the difficulty of construction quality inspection and reduces the workload of inspectors. Inspectors only need to carry a pressure gauge to detect the injected oil pressure to realize joint quality inspection. In addition, if the joint connection performance decreases during later use, it is only necessary to replenish the oil in time and increase the oil pressure, thereby avoiding the problem of maintenance and replacement of existing grouting connecting sleeves.

[0048] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it should be understood that although this specification is described in terms of implementation methods, not each implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole. The technical solutions in the various embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A hydraulic anchoring steel bar connection sleeve, comprising a first sleeve and a second sleeve, wherein one end of the first sleeve is screwed into the second sleeve to form a threaded fastening connection, and the other end of the first sleeve is provided with a first internal thread for fixed connection to a precast concrete steel bar, characterized in that: The first sleeve is provided with an oil filling hole and an exhaust hole, both of which are connected to the channel in the first sleeve, and the oil filling hole and the exhaust hole are both provided with oil seals; A circumferential groove is provided in the second sleeve, and a limiting clamp ring is provided in the groove to divide the second sleeve into a front end and a rear end, wherein the inner diameter of the sleeve at the front end gradually shrinks outward, and the inner diameter of the rear end remains unchanged, and a piston is accommodated therein, and the piston transitionally fits and moves in the rear end; at least two wedge-shaped clamps are provided along the circumference on the inner wall of the front end, and second internal threads are provided on the opposite curved surfaces of the wedge-shaped clamps for fixedly connecting the inserted steel bars to be connected; the front end of the piston has a supporting portion, which pushes the wedge-shaped clamps to tighten and bite the inserted steel bars to be connected when the piston moves from the rear end to the front end; The supporting portion is a hollow cylinder, integrally formed with the piston, and has a ring-shaped cross section. The inner diameter of the ring is larger than the steel bar to be connected, and the outer diameter of the ring is smaller than the inner diameter of the limiting clamp. When the piston moves, it passes through the limiting clamp to contact and push the end of the wedge-shaped buckle; The limiting snap ring comprises a snap ring body, a snap ring opening and a limiting portion, wherein the number of the limiting portions is the same as and corresponds to that of the wedge-shaped snap buckle, and the shape thereof is the same as the cross section of the wedge-shaped snap buckle.

2. The hydraulic anchoring steel bar connection sleeve according to claim 1, characterized in that: An airtight member is provided at the connection between the first sleeve and the second sleeve.

3. The hydraulic anchoring steel bar connection sleeve according to claim 1, characterized in that: The contact surfaces between the wedge-shaped buckle and the inner wall of the front sleeve are complementary inclined surfaces, so that the cylindrical channel formed between the opposite curved surfaces of the wedge-shaped buckle is coaxial with the center of the sleeve.

4. The hydraulic anchoring steel bar connection sleeve according to claim 1, characterized in that: The oil filling hole and the exhaust hole are arranged on the same side of the first sleeve. The oil filling hole extends radially outward from the first sleeve to form an oil filling pipe, and the exhaust hole extends radially outward from the first sleeve to form an exhaust pipe, wherein the ends of the oil filling pipe and the exhaust pipe are both threadedly connected with oil seals.

5. The hydraulic anchoring steel bar connection sleeve according to claim 1, characterized in that: The oil seal includes a one-way valve and a valve cap, which are connected by threads, wherein the one-way valve includes a valve body, a spring, and a sealing member, wherein both ends of the valve body are provided with connecting threads, and two retaining rings are fixedly provided in the middle of the valve body, and the spring is accommodated in the middle of the retaining ring. A sealing member is provided between the retaining ring at the lower end and the spring, and the sealing member includes an integrally formed sealing disk and a sealing rod, wherein the diameter of the sealing disk is larger than the inner diameter of the retaining ring.

6. The hydraulic anchoring steel bar connection sleeve according to claim 1, characterized in that: The piston is made of cast iron, and its surface roughness Ra is less than 1.

2.

7. The hydraulic anchoring steel bar connection sleeve according to claim 2, characterized in that: The airtight component is a water-stop valve, which is arranged at the end of the threaded connection between the second sleeve and the first sleeve.

8. A method for connecting a hydraulic anchoring steel bar connecting sleeve according to any one of claims 1 to 7, characterized in that The steps of the connection method include: S1: Grind and thread the longitudinal steel bars on the concrete member, and fasten them with the first sleeve by threading; S2: Install three wedge-shaped clips in the inner diameter of the front sleeve and install two limit rings into the groove to limit the displacement of the wedge-shaped clips; S3: Install the piston into the rear end of the second sleeve with the supporting portion facing the front end; screw one end of the first sleeve into the second sleeve to form a threaded fastening connection, completing the overall assembly of the sleeve; S4: After grinding and threading the steel bars to be connected, insert them into the threaded holes formed by the wedge-shaped buckles at the front end; S5: Use a press to inject oil into the sleeve from the oil filling hole. When the oil flows out from the exhaust hole, the air in the sleeve is discharged, and the exhaust hole is sealed with an oil seal. S6: Continue to pressurize and inject oil so that the top support part pushes the wedge-shaped buckle to tighten. After the steel bars to be connected are tightened to a certain standard, seal the oil injection hole to ensure the airtightness of the entire sleeve.

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