A hydraulic installation tool for installing a reinforcing bar connection joint

Abstract

The application discloses a hydraulic installation tool for installing a reinforcing steel bar connecting joint, which comprises a multifunction sleeve, a sleeve ring and an axial tensioning tool; an inner thread corresponding to the outer thread of the reinforcing steel bar is formed on the inner wall of the multifunction sleeve; two sleeve rings are arranged on the two ends of the multifunction sleeve respectively; the axial tensioning tool comprises two hydraulic cylinders and a pair of cross-arranged clamping arms, the two clamping arms are rotationally connected, the piston rods of the two hydraulic cylinders are oppositely arranged and are connected with the input ends of the two clamping arms respectively, and the output ends of the clamping arms are used for applying axial thrust to the sleeve ring. The axial pushing principle is adopted, the interference fit of the threaded pair is realized through uniform radial contraction force, the violent plastic deformation of the reinforcing steel bar base material caused by the traditional radial extrusion is avoided, the original mechanical properties and fatigue strength of the reinforcing steel bar base material can be maximally maintained, and the harsh requirements of a nuclear power station on the super-long service life of a structural member are met.

Description

Technical Field

[0001] This invention relates to the field of building technology, and in particular to a hydraulic installation tool for installing rebar connection joints. Background Technology

[0002] In nuclear power plant construction, the reinforced concrete structures of core structures such as the nuclear island and conventional island must withstand extreme conditions such as high temperatures, high radiation, humidity fluctuations, earthquakes, and tsunamis over long periods. This places far more stringent requirements on the strength, sealing, and long-term stability of the steel reinforcement connections than on ordinary building construction. Currently, the core load-bearing structures of nuclear power plants mostly use titanium-containing steel bars (such as titanium alloy modified steel bars) or other special alloy steel bars. Their excellent corrosion resistance, fatigue resistance, and high-temperature stability ensure that the steel bars maintain their mechanical properties over a long period under special environments. However, the high hardness and toughness of titanium-containing steel bars also place higher demands on connection processes and tools. Although auxiliary structures partially use ordinary steel bars, they must be compatible with the connection construction of titanium-containing steel bars, further increasing the complexity of construction.

[0003] Currently, in the field of nuclear power plant steel reinforcement connection, the low joint strength of tying connections and the welding connections that easily lead to oxidation of titanium-containing steel bars have been gradually abandoned, and mechanical connections have become the mainstream technology. Among them, "hydraulic radial crimping technology" has become a widely used mechanical connection method because it can apply huge radial pressure to the sleeve through hydraulic tools, causing the sleeve to undergo plastic deformation and interlock with the surface of the steel bar, forming a strong connection.

[0004] However, in the special application scenario of nuclear power plants, special steel bars containing titanium and other materials are extremely sensitive to cold work hardening and stress concentration. Severe radial extrusion may cause changes in the surface structure of the steel bars, creating stress concentration points at the edge of the sleeve, which may affect the fatigue resistance and long-term durability of the material. In addition, nuclear power plant structures have high steel bar density, complex reinforcement layout, and are mostly multi-layered mesh structures. Traditional radial extrusion tools are bulky and extremely difficult to move, position, and operate in such a dense space. This not only results in low efficiency but also poses a safety risk of colliding with tied steel bars or formwork. Summary of the Invention

[0005] The technical problem solved by the present invention is to provide a hydraulic installation tool for installing rebar connection joints.

[0006] This application provides a hydraulic installation tool for installing rebar connection joints, comprising, A multi-functional sleeve with an inner wall formed with an internal thread that corresponds to the external thread of the reinforcing bar; Two collars are provided, which are respectively fitted onto both ends of the multifunctional sleeve; An axial tensioning tool includes two hydraulic cylinders and a pair of cross-arranged clamp arms. The two clamp arms are rotatably connected, and the piston rods of the two hydraulic cylinders are arranged facing each other and respectively connected to the input ends of the two clamp arms. The output ends of the clamp arms are used to apply axial thrust to the collar.

[0007] Furthermore, the outer wall of the multifunctional sleeve is provided with an annular shoulder in the middle; and the two hydraulic cylinders are connected by a hydraulic synchronization circuit.

[0008] Furthermore, the inner surface of the collar is machined with an inner conical hole, which presses against the outer wall of the multifunctional sleeve, and the outer surface of the collar is machined with an annular groove, which cooperates with and is fixed to the corresponding clamp arm.

[0009] Furthermore, the collar is composed of at least two latches, each latch having a guide slope on its side and an annular groove on its outer wall. When the latches are engaged, the annular grooves together form an annular groove. A spring retainer is provided in the annular groove. The spring retainer is an O-type spring with an opening, and its outer diameter is smaller than the outer diameter of the annular groove.

[0010] Furthermore, each of the clamp arms has an adapter head detachably connected to its output end, and the shape of the adapter head is adapted to the annular groove.

[0011] Furthermore, the axial tensioning tool also includes, The annular frame is secured at its ends to the outer wall of the multifunctional sleeve; Two thrust blocks are provided. The thrust blocks are T-shaped, with one end connected to the piston rod of the corresponding hydraulic cylinder by a ball joint, and the other end in contact with the input end of the corresponding clamp arm. Two hydraulic cylinders are coaxially mounted on the annular frame, and the two clamp arms are hinged to the annular frame via a central pin, with the output end of the clamp arm being longer than the input end.

[0012] Furthermore, the annular frame is C-shaped, and a guide block is machined on the lower half of its inner wall. The guide block is located on the top end face of the lower collar, and the opening width of the annular frame is greater than the diameter of the reinforcing bar and smaller than the outer diameter of the collar.

[0013] Furthermore, a quick-locking mechanism is hinged to one side of the opening of the annular frame, and the quick-locking mechanism locks correspondingly to the other side of the opening.

[0014] Furthermore, a double torsion spring is sleeved on the central pin shaft, and the two lever arms of the double torsion spring respectively press against the inner side of the root of the output end of the clamp arm, providing the opening and restoring force for the output end of the clamp arm.

[0015] Furthermore, grooves are provided on the opposite end faces of the two thrust blocks, and the input ends of the two clamp arms are slidably connected in the grooves.

[0016] Compared with existing technologies, this invention adopts the principle of axial pushing and achieves interference fit of threaded pairs through uniform radial shrinkage force, avoiding the severe plastic deformation of the steel reinforcement base material caused by traditional radial extrusion. It can maintain its original mechanical properties and fatigue strength to the maximum extent, meeting the stringent requirements of nuclear power plants for ultra-long service life of structural components. In addition, the extended range design of the clamp arm makes it easy to handle the extremely complex multi-layer, high-density steel reinforcement mesh in nuclear power plant engineering. Operators can complete the connection of upper steel reinforcement joints on the lower working surface, which greatly reduces the safety risks and high-altitude work intensity when working in dense steel reinforcement mesh. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0018] Figure 1 This is a schematic diagram of the hydraulic installation tool for installing rebar connection joints according to the present invention; Figure 2 yes Figure 1 Enlarged view of A in the middle; Figure 3 This is a top view of the collar of the present invention; Figure 4 This is a cross-sectional view of the collar of the present invention; Figure 5 This is a schematic diagram of the ring frame structure of the present invention; Figure 6 This is a schematic diagram of the structure of the central pin of the present invention; Figure 7 This is a top view of the ring frame of the present invention.

[0019] The reference numerals in the attached figures include: 1. Multi-functional sleeve; 2. Collar; 21. Clamping flap; 22. Guide bevel; 23. Annular groove; 24. Spring retaining ring; 3. Axial tensioning tool; 31. Hydraulic cylinder; 32. Clamping arm; 33. Annular frame; 34. Thrust block; 35. Ball head; 36. Guide block; 37. Quick locking mechanism; 38. Slide groove; 4. Annular shoulder; 6. Inner conical hole; 7. Annular groove; 8. Adapter head; 9. Center pin; 10. Double torsion spring; 11. External thread; 12. Internal thread; 13. Rebar. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] like Figure 1 As shown, the hydraulic installation tool for installing rebar connectors of the present invention includes a multi-functional sleeve 1, a collar 2, and an axial tensioning tool 3; the inner wall of the multi-functional sleeve 1 is formed with an internal thread 12 corresponding to the external thread 11 of the rebar 13, and an annular shoulder 4 is provided in the middle of the outer wall; two collars 2 are provided, respectively fitted on both ends of the multi-functional sleeve 1; the axial tensioning tool 3 includes two hydraulic cylinders 31 and a pair of cross-arranged clamping arms 32, the two clamping arms 32 are rotatably connected to each other, the two hydraulic cylinders 31 are connected through a hydraulic synchronization circuit, and the piston rods of the two hydraulic cylinders 31 are arranged facing each other and respectively connected to the input ends of the two clamping arms 32, and the output ends of the clamping arms 32 are used to apply axial thrust to the collar 2.

[0022] This embodiment employs the principles of axial pushing and conical self-locking. The interference fit of the threaded pair is achieved through uniform radial contraction force, avoiding the severe plastic deformation of the reinforcing steel base material caused by traditional radial extrusion. This maximizes the preservation of its original mechanical properties and fatigue strength, meeting the stringent requirements of nuclear power plants for ultra-long service life of structural components. Furthermore, the extended-range design of the clamp arm (32mm) allows it to easily handle the extremely complex multi-layered, high-density reinforcing steel mesh in nuclear power plant engineering. Operators can complete the connection of upper-layer reinforcing steel joints from the lower working surface, greatly reducing the safety risks and high-altitude work intensity when working through dense reinforcing steel meshes. In addition, the two cylinders achieve precise synchronous opposite movement through a synchronous circuit, ensuring that the locking force applied to both ends of the sleeve is absolutely symmetrical and uniform. This process eliminates fluctuations in connection quality caused by differences in manual operation.

[0023] In some embodiments, the inner surface of the collar 2 is machined with an inner conical hole 6, which presses against the outer wall of the multifunctional sleeve 1, and the outer surface of the collar 2 is machined with an annular groove 7, which cooperates and is fixed with the corresponding clamp arm 32; the collar 2 is composed of at least two latching flaps 21, each latching flap 21 has a guide slope 22 on its side, and each latching flap 21 has an annular groove 23 on its outer wall. After the latching flaps 21 are engaged, the annular grooves 23 together form an annular groove. A spring retaining ring 24 is provided in the annular groove. The spring retaining ring 24 is an O-type spring with an opening, and its outer diameter is smaller than the outer diameter of the annular groove; the output end of each clamp arm 32 is detachably connected to an adapter head 8, and the shape of the adapter head 8 is adapted to the annular groove 7.

[0024] In this embodiment, the collar 2 is designed as a separate structure composed of clips 21, and the spring retaining ring 24 is used as a stirrup to realize the combined installation of the collar 2. During construction, workers can easily assemble the clips 21 directly onto both ends of the sleeve on the construction site, thus avoiding the cumbersome step of threading the sleeve through the end of the reinforcing bar 13. Furthermore, the guide slope 22 provided on the side of each clip 21 can guide each other and accurately position the clips 21 when they contract radially under axial thrust, ensuring that all clips 21 contract synchronously and concentrically, effectively preventing individual clips from contracting. The locking mechanism prevents jamming, wear, and even damage caused by delayed or misaligned movement of the locking flap 21. Furthermore, the two annular grooves 7 machined on the outer surface of the collar 2 precisely engage with the adapter head 8 at the output end of the clamp arm 32, forming a highly efficient force transmission mechanism. This mechanism accurately converts the output thrust of the clamp arm 32 into the axial movement of the collar 2, effectively preventing relative slippage and misalignment that may occur under high thrust. In addition, the detachable connection between the output end of the clamp arm 32 and the adapter head 8, along with the segmented design of the collar 2 itself, constitute a modular tool system. This design allows for the replacement of only the corresponding adapter head 8 and collar 2 assembly for different diameter rebar 13 joints, eliminating the need to purchase the entire expensive hydraulic tensioning tool body, greatly improving the tool's versatility and economy.

[0025] In some embodiments, the axial tensioning tool 3 further includes an annular frame 33 and a thrust block 34; the end of the annular frame 33 is fixed to the outer wall of the multifunctional sleeve 1, two hydraulic cylinders 31 are coaxially mounted on the annular frame 33, and the two clamping arms 32 are hinged to the annular frame 33 by a central pin 9 (the central pin 9 is connected to the inner wall of the annular frame 33 by a bearing), and the length of the output end of the clamping arm 32 is greater than the length of the input end; there are two thrust blocks 34, which are T-shaped, one end of which is hinged to the piston rod of the corresponding hydraulic cylinder 31 by a ball head 35, and the other end is in contact with the input end of the corresponding clamping arm 32; the annular frame 33 is C-shaped, and the lower half of its inner wall is machined with a guide block 36, which is located on the top end face of the lower collar 2, and the opening width of the annular frame 33 is greater than the diameter of the reinforcing bar 13 and smaller than the outer diameter of the collar 2.

[0026] In this embodiment, the annular frame 33 is designed as a C-shaped structure, with its opening width greater than the diameter of the reinforcing bar 13 but smaller than the outer diameter of the collar 2. A guide block 36 is machined on the lower half of the inner wall, allowing the tool to engage radially from the side of the multi-functional sleeve 1. After positioning, the frame "sits" on the end face of the lower collar 2 via its guide block 36, using the tool's own weight for temporary stable support, providing a stable reference platform for subsequent hydraulic operations. Additionally, two hydraulic cylinders 31 are coaxially mounted on the annular frame 33, driving the input ends of the two clamping arms 32, while the clamping arms 32 serve as the output ends. The combination of the three elements—a lever design with a length greater than the input end, and a lever structure that saves effort—creates an extremely efficient mechanical system: First, the opposing motion of the opposing cylinders creates a closed loop of enormous locking force within the annular frame 33. The tool operates without any net external force output, preventing any overturning moment on the reinforcing bar 13 or the operator, thus ensuring absolute stability and safety during operation. Second, the lever structure amplifies the thrust of the cylinders, allowing for the output of the required enormous locking force using smaller, lighter cylinders. This results in overall tool weight reduction and significantly lowers the operator's workload.

[0027] Specifically, the thrust block 34 adopts a T-shaped structure, with a thick vertical rod connected to the piston rod. When placed inside the frame, and the frame is placed horizontally (i.e., its axis is parallel to the axis of the reinforcing bar 13), the axis of the piston rod is also parallel to the axis of the frame. In this case, the T-shaped thrust block 34 is placed horizontally, with the vertical rod becoming a horizontal rod. The end of the horizontal rod is hinged to the piston rod via a ball joint 35. The ball joint 35 hinge allows the thrust block 34 to adaptively fine-tune its angle in multiple directions, compensating for minor misalignment caused by manufacturing tolerances, installation errors, or deformation under stress. This ensures that the hydraulic thrust is always accurately transmitted along the piston rod axis, effectively preventing problems such as seal damage and cylinder wear caused by the piston rod bearing lateral forces.

[0028] In some embodiments, a quick-locking mechanism 37 is hinged to one side of the opening of the annular frame 33, and the quick-locking mechanism 37 locks correspondingly to the other side of the opening.

[0029] The introduction of the quick-locking mechanism 37 in this embodiment changes the connection between the tool and the rebar 13 joint. The operator only needs to close the locking mechanism and trigger the locking action (such as pulling the handle or pressing the hydraulic button) to complete the state transition of the ring frame 33 from "open" to "closed and locked" within a few seconds, which further provides stability to the tool and avoids the risk of the frame opening accidentally.

[0030] Specifically, the quick-locking mechanism 37 includes a locking block hinged to the opening of the annular frame 33 and a screw or hydraulic pin connected to the hinge block. The screw locks the locking block to the annular frame 33 by rotating the handle, while the hydraulic pin automatically engages with the slot of the annular frame 33 to achieve locking.

[0031] In some embodiments, a double torsion spring 10 is sleeved on the central pin 9. The two arms of the double torsion spring 10 (i.e., two torsion springs arranged side by side along the axial direction of the central pin 9) respectively press against the inner side of the root of the output end of the clamp arm 32, providing an opening and restoring force for the output end of the clamp arm 32. A sliding groove 38 is provided on the opposite end faces of the two thrust blocks 34, and the input ends of the two clamp arms 32 are slidably connected in the sliding groove 38.

[0032] In this embodiment, a double torsion spring 10 provides a continuous, stable, and directional reset torque for the clamp arm 32. This design ensures that after the hydraulic cylinder 31 is depressurized, the output end of the clamp arm 32 can actively and forcibly disengage from the collar 2. In addition, by opening a sliding groove 38 on the thrust block 34 and making the input end of the clamp arm 32 slide connected to it, the "cylinder return motion" and the "clamp arm 32 reset motion" are cleverly decoupled. This structure allows the cylinder piston rod to freely drive the thrust block 34 back when it retracts, without interfering with or hindering the reset action of the clamp arm 32 under the action of the torsion spring. At the same time, during the working stroke, this sliding connection can effectively compensate for assembly clearance and manufacturing tolerance, ensuring that the axial thrust is efficiently and losslessly transmitted to the clamp arm 32, avoiding internal stress caused by structural interference, and significantly improving the reliability and service life of the tool.

[0033] Working principle: 1. Preparation and Placement Phase: First, screw the multi-functional sleeve 1 into the two steel bars 13 (such as titanium steel bars 13) to be connected by thread.

[0034] Two collars 2, each consisting of a retaining flap 21 and a spring retaining ring 24, are respectively fitted onto both ends of the sleeve.

[0035] Open the quick-locking mechanism 37 of the ring frame 33, and snap the frame radially from the joint side of the steel bar 13, so that the guide block 36 on the inner wall of the frame sits on the top of the lower collar 2, close and lock the quick-locking mechanism 37, so that the ring frame 33 becomes a rigid whole.

[0036] At this time, under the preload of the double torsion spring 10, the output ends of the two clamp arms 32 are in a ready state of opening outwards. The operator fine-tunes the frame position so that the adapter head 8 of the output end of the clamp arm 32 is engaged in the annular groove 7 of the collar 2.

[0037] 2. Locking stage: When the hydraulic system is started, pressurized oil enters the rodless chambers of the two opposing hydraulic cylinders 31 synchronously through a hydraulic synchronization circuit (such as a flow divider / combiner valve).

[0038] The piston rods of the two cylinders extend towards each other, pushing the T-shaped thrust block 34 which is hinged to them through the ball head 35.

[0039] The push block 34 overcomes the resistance of the double torsion spring 10 and pushes the input end of the clamp arm 32 to open it outward.

[0040] According to the lever principle, the clamp arm 32 rotates around the central pin 9, and its longer output end closes inward, generating an amplified thrust. This thrust strongly pushes the two collars 2 through the adapter head 8, causing them to move towards each other along the outer conical surface 5 of the sleeve (i.e., towards the annular shoulder 4 at the center of the sleeve).

[0041] During this process, the inner conical surface of the collar 2 moves relative to the outer wall of the sleeve. According to the principle of inclined plane, the axial thrust is converted into a huge radial contraction force, which forces the sleeve body to contract (i.e., the inner and outer diameters of the sleeve are reduced), so that its inner thread 12 and the outer thread 11 of the steel bar 13 are tightly engaged together, achieving equal strength mechanical locking. At this time, all forces (cylinder thrust, clamp arm 32 thrust, collar 2 reaction force) form a closed balance inside the annular frame 33.

[0042] 3. Reset and disengagement phase: Once locking is complete, the hydraulic system is depressurized, and the piston rod of the cylinder begins to retract under the action of the internal return spring.

[0043] At the same time, the energy stored in the compressed double torsion spring 10 is released instantly, and its two levers forcefully push the output ends of the two clamp arms 32 outward, so that they completely disengage from the groove of the collar 2.

[0044] Due to the sliding connection design between the groove 38 on the thrust block 34 and the input end of the clamp arm 32, the retraction movement of the hydraulic cylinder and the thrust block 34 and the reset movement of the clamp arm 32 do not interfere with each other and proceed smoothly.

[0045] Once the tool is fully reset to the ready position, open the quick-locking mechanism 37 to remove the annular frame 33 radially from the joint side and move it to the next joint with the pre-installed collar 2 to begin a new work cycle.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0047] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0048] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0049] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A hydraulic installation tool for installing rebar connectors, characterized in that, include, The multi-functional sleeve (1) has an inner thread (12) formed on its inner wall that corresponds to the external thread (11) of the reinforcing bar (13). Two collars (2) are provided, which are respectively fitted onto both ends of the multifunctional sleeve (1); The axial tensioning tool (3) includes two hydraulic cylinders (31) and a pair of cross-arranged clamp arms (32). The two clamp arms (32) are rotatably connected, and the piston rods of the two hydraulic cylinders (31) are arranged facing each other and respectively connected to the input ends of the two clamp arms (32). The output ends of the clamp arms (32) are used to apply axial thrust to the collar (2).

2. The hydraulic installation tool for installing rebar connection joints as described in claim 1, characterized in that, The outer wall of the multi-functional sleeve (1) is provided with an annular shoulder (4); and the two hydraulic cylinders (31) are connected by a hydraulic synchronization circuit.

3. The hydraulic installation tool for installing rebar connection joints as described in claim 2, characterized in that, The inner surface of the collar (2) is machined with an inner conical hole (6), which is pressed against the outer wall of the multifunctional sleeve (1). The outer surface of the collar (2) is machined with an annular groove (7), which is fixed in conjunction with the corresponding clamp arm (32).

4. The hydraulic installation tool for installing rebar connection joints as described in claim 3, characterized in that, The collar (2) is composed of at least two latches (21). Each latch (21) has a guide slope (22) on its side. Each latch (21) has an annular groove (23) on its outer wall. After the latches (21) are engaged, the annular grooves (23) together form an annular groove. A spring retainer (24) is provided in the annular groove. The spring retainer (24) is an O-type spring with an opening, and its outer diameter is smaller than the outer diameter of the annular groove.

5. The hydraulic installation tool for installing rebar connectors as described in claim 4, characterized in that, Each of the clamp arms (32) has an adapter head (8) detachably connected to its output end. The shape of the adapter head (8) is adapted to the annular groove (7).

6. The hydraulic installation tool for installing rebar connectors as described in claim 5, characterized in that, The axial tensioning tool (3) also includes, The annular frame (33) is fixed at its end to the outer wall of the multifunctional sleeve (1); Two thrust blocks (34) are provided. The thrust blocks (34) are T-shaped. One end is hinged to the piston rod of the corresponding hydraulic cylinder (31) through a ball head (35), and the other end is in contact with the input end of the corresponding clamp arm (32). Two hydraulic cylinders (31) are coaxially mounted on the annular frame (33), and two clamp arms (32) are hinged to the annular frame (33) through a central pin (9), and the length of the output end of the clamp arm (32) is greater than the length of the input end.

7. The hydraulic installation tool for installing rebar connectors as described in claim 6, characterized in that, The annular frame (33) is C-shaped, and the lower half of its inner wall is machined with a guide block (36). The guide block (36) is located on the top end face of the collar (2) below. The opening width of the annular frame (33) is greater than the diameter of the steel bar (13) and smaller than the outer diameter of the collar (2).

8. The hydraulic installation tool for installing rebar connectors as described in claim 7, characterized in that, A quick-locking mechanism (37) is hinged to one side of the opening of the annular frame (33), and the quick-locking mechanism (37) locks to the other side of the opening.

9. The hydraulic installation tool for installing rebar connectors as described in claim 8, characterized in that, A double torsion spring (10) is sleeved on the central pin (9). The two arms of the double torsion spring (10) are respectively pressed against the inner side of the root of the output end of the clamp arm (32), providing the opening and restoring force for the output end of the clamp arm (32).

10. The hydraulic installation tool for installing rebar connectors as described in claim 9, characterized in that, The two thrust blocks (34) have grooves (38) on their opposite end faces, and the input ends of the two clamp arms (32) are slidably connected in the grooves (38).

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