Jack for tensioning side slope anchor cable

Abstract

The jack for tensioning the side slope anchor cable comprises a tensioning jacking assembly and a reverse pushing assembly, the reverse pushing assembly is formed by combining a reverse pushing cylinder body, a cover plate, a working anchorage device clamping plate and a reverse pushing piston body, and the cover plate packages the reverse pushing piston body in the reverse pushing cylinder body through a fastening bolt. A return spring is further arranged between the reverse thrust piston body and the cover plate; the reverse thrust piston body is provided with two or more limiting grooves, limiting pieces capable of being connected with a steel strand are installed in the limiting grooves, and the working anchorage device clamping plate is installed on the cover plate through fastening bolts. And hydraulic oil joints which can be communicated with the oil pump assembly are arranged on the tensioning top assembly and the reverse thrust assembly. Hydraulic oil is provided through the oil pump assembly, automatic tensioning and unloading are achieved, and the working efficiency is greatly improved. Manual intervention is not needed in the whole tensioning process, potential safety hazards are reduced, clamping piece damage and prestress loss caused by rapid rebounding of the steel strand can be avoided through the slow back-pushing function of the back-pushing assembly, and the device is quite matched with a side slope prestress anchor cable and suitable for newly-built side slope anchor cables and existing side slope anchor cables.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of anchor cable fastening, in particular to a jack for tensioning slope anchor cable. BACKGROUND

[0002] The tensioning mode of the traditional slope prestressed anchor cable tensioning equipment often causes the rapid rebound of the steel strand and the clamping piece after unloading, causes the component damage and the prestress loss, needs a large amount of manual intervention to observe and adjust the state of the clamping piece, is inefficient, has the security hidden danger, and even cannot hit the clamping piece into the anchorage device when the operation is improper, influences the reinforcing effect of the anchor cable. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problem, the utility model aims at providing a jack for tensioning slope anchor cable safely and efficiently, which reduces the damage of the rapid rebound of the clamping piece and the anchor system and the prestress loss.

[0004] To realize the technical purpose, the utility model's scheme is: a jack for tensioning slope anchor cable, including tensioning top subassembly and counter -pushing subassembly, counter -pushing subassembly is made of counter -pushing cylinder body, apron, working anchor device clamping plate and counter -pushing piston body combination, apron is encapsulated in counter -pushing cylinder body by fastening bolt and counter -pushing piston body, still be provided with return spring between counter -pushing piston body and apron;Counter -pushing piston body is provided with more than two limit slots, install the limit piece that can be connected with the steel strand in the limit slot, working anchor device clamping plate is installed on apron through fastening bolt;

[0005] The tensioning top subassembly and the counter -pushing subassembly are provided with hydraulic oil joint that can communicate with the oil pump assembly.

[0006] As preferred, the tensioning top subassembly is composed of tensioning top oil cylinder body and tensioning top piston body, the tensioning top oil cylinder body is provided with a hollow structure of tensioning top through sleeve, the tensioning top piston body is arranged between the tensioning top oil cylinder body and the tensioning top through sleeve, and the tensioning top piston body is further provided with an anchor end fixing piece; a first plug is arranged between the lower part of the tensioning top oil cylinder body and the tensioning top through sleeve, and a second plug is arranged between the bottom of the tensioning top oil cylinder body and the tensioning top through sleeve.

[0007] As preferred, the limit piece includes an elastic limit body, a pre-tightening spring and a spring force adjusting nut, the elastic limit body is provided with a trumpet-shaped through hole structure, the elastic limit body and the pre-tightening spring are nested and installed in the limit slot, and the pre-tightening spring is provided at the tail end with a spring force adjusting nut for adjusting the spring force.

[0008] As preferred, the anchor end fixing member comprises a tool anchor end for connecting the steel strand, a displacement flange and a tensioning top bayonet guard, the tool anchor end is connected with the top of the tensioning top piston body through the tensioning top bayonet guard, the displacement flange is sleeved outside the tool anchor end and is fixedly connected with the top of the tensioning top piston body.

[0009] As preferred, both ends of the displacement flange are provided with a handle.

[0010] As preferred, a transparent observation window is arranged on the outer side wall of the back-pushing cylinder body.

[0011] As preferred, a first oil seal assembly is arranged between the back-pushing piston body and the back-pushing cylinder body; and a second oil seal assembly is arranged between the tensioning top piston body and the tensioning top cylinder body.

[0012] The application provides hydraulic oil through the oil pump assembly, realizes automatic tensioning and unloading, and greatly improves work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is the sectional view of the utility model;

[0014] Fig. 2 is the sectional view of the back-pushing assembly in the utility model;

[0015] Fig. 3 is the top structure schematic view of the utility model.

[0016] In the drawing: 1, back-pushing assembly; 11, back-pushing cylinder body; 12, cover plate; 13, working anchor clamp plate; 14, back-pushing piston body; 15, return spring; 16, limiting groove; 17, limiting member; 171, elastic limiting body; 172, pre-tightening spring; 173, elastic force adjusting nut; 18, fastening bolt; 19, first oil seal assembly; 2, tensioning top assembly; 21, tensioning top cylinder body; 211, tensioning top through sleeve; 22, tensioning top piston body; 23, anchor end fixing member; 231, tool anchor end; 232, displacement flange; 233, tensioning top bayonet guard; 234, handle; 24, first plug; 25, second plug; 26, second oil seal assembly; 3, hydraulic oil joint; 4, oil pump assembly; 5, working anchor; 6, clamping piece. DETAILED DESCRIPTION

[0017] The utility model will be further described in detail below in combination with the drawings and specific embodiments. In order to clearly and completely describe the technical solutions, the following embodiments are selected for description; based on the content described in the present application, other embodiments obtained without creative labor are within the scope of protection of the utility model.

[0018] In the following embodiments, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of clearly describing the embodiments, and do not indicate or imply that the devices or elements referred to must have a specific orientation, so it cannot be understood as a limitation on the present application.

[0019] As shown in the utility model, the specific embodiment of the utility model is a jack, mainly comprising a tensioning top assembly 2 and a counter-pushing assembly 1. Figs. 1-3

[0020] The counter-pushing assembly 1 is composed of a counter-pushing cylinder body 11, a cover plate 12, a working anchor clamp plate 13 and a counter-pushing piston body 14. The cover plate 12 encapsulates the counter-pushing piston body 14 in the counter-pushing cylinder body 11 through fastening bolts 18, and a return spring 15 is arranged between the counter-pushing piston body 14 and the cover plate 12, for resetting the counter-pushing piston body 14 after unloading. Two or more than two limiting grooves 16 are designed on the counter-pushing piston body 14, preferably three to seven limiting grooves 16, and limiting members 17 are installed in the limiting grooves 16 for connecting with the steel strand. The working anchor clamp plate 13 is installed on the cover plate 12 through fastening bolts 18 for fixing the working anchor.

[0021] The tensioning top assembly 2 is composed of a tensioning top oil cylinder body 21 and a tensioning top piston body 22. The tensioning top oil cylinder body 21 is provided with a hollow tensioning top through sleeve 211, and the tensioning top piston body 22 is located between the tensioning top oil cylinder body 21 and the tensioning top through sleeve 211. An anchor end fixing member 23 is further arranged on the top of the tensioning top piston body 22 for connecting with the steel strand. In addition, a first plug 24 and a second plug 25 are arranged between the lower part and the bottom of the tensioning top oil cylinder body 21 and the tensioning top through sleeve 211 respectively, so as to ensure that the hydraulic oil does not leak.

[0022] The tensioning top assembly 2 and the counter-pushing assembly 1 are both provided with hydraulic oil connectors 3 which can communicate with the oil pump assembly 4. In operation, the oil pump assembly 4 provides hydraulic oil to the tensioning top assembly 2 and the counter-pushing assembly 1 through the hydraulic oil connectors 3.

[0023] ​During preparation, the prestressed steel strand is first threaded through the working anchor 5, the working anchor 5 is installed with the clamping piece 6 to enclose and clamp the prestressed steel strand, and the bottom of the jack is combined with the working anchor 5 through the clamping plate. During tensioning, the tensioning top piston body 22 of the tensioning top assembly 2 moves upward under the push of the hydraulic oil, driving the anchor end fixing part 23 and the connected steel strand to move together, thereby realizing the tensioning of the slope anchor cable. When the preset tensioning force is reached, the oil pump assembly 4 is closed, at this time, the prestressed steel strand in the anchor cable has reached the predetermined tensioning force, and the stability and carrying capacity of the structure are improved.

[0024] After tensioning is completed, the oil pump assembly 4 provides hydraulic oil to the counter-pushing assembly 1, so that the counter-pushing piston body 14 exerts pressure on the working anchor 5 upward, which can prevent the working clamping piece from being taken out by the steel strand during tensioning. Since the movement of the counter-pushing piston body 14 can be controlled at a rate, it can avoid the problem of damage caused by the rapid rebound of the clamping piece 6 after tensioning, the problem of poor contact between the working anchor clamping plate 13 and the working anchor, and the problem of loss of prestress caused by the rebound of the clamping piece.

[0025] The design of the limiting part 17 includes an elastic limiting body 171, a pre-tightening spring 172 and a spring force adjusting nut 173. The trumpet-shaped through hole structure in the elastic limiting body 171 can adapt to steel strands of different diameters, and the elastic limiting body 171 can limit the excessive movement of the clamping piece 6 during tensioning, thereby creating conditions for accurately returning the clamping piece 6. The pre-tightening spring 172 and the spring force adjusting nut 173 are used to adjust the clamping force of the limiting part 17 on the steel strand.

[0026] The design of the anchor end fixing part 23 includes a tool anchor end 231, a displacement flange 232 and a tensioning top bayonet guard 233. The tool anchor end 231 is used to connect the steel strand, the displacement flange 232 is fixedly connected to the top of the tensioning top piston body 22, thereby achieving stable connection with the tensioning top assembly 2, the displacement flange 232 is used to measure and record the displacement of the steel strand, and the tensioning top bayonet guard 233 is used to protect the top of the tensioning top piston body 22. The displacement flange 232 also has a handle 234, through which the operator can more conveniently move and position the jack, and which is also conducive to disassembly and inspection of the jack during maintenance.

[0027] In order to facilitate observation of the working anchor and operation, a transparent observation window is provided on the outer side wall of the counter-pushing cylinder body 11.

[0028] In order to prevent hydraulic oil leakage, a first oil seal assembly 19 and a second oil seal assembly 26 are respectively provided between the counter-pushing piston body 14 and the counter-pushing cylinder body 11, and between the tensioning top piston body 22 and the tensioning top cylinder body 21.

[0029] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application, and any slight modification, equivalent replacement and improvement made according to the technical essence of the present application to the above embodiments shall be included in the protection scope of the technical scheme of the present application.

Claims

1. A jack for tensioning a slope cable, characterised in that: The tensioning top assembly and the back-pushing assembly are combined by a back-pushing cylinder, a cover plate, a working anchor clamping plate and a back-pushing piston body, the cover plate encapsulates the back-pushing piston body in the back-pushing cylinder through fastening bolts, and a return spring is arranged between the back-pushing piston body and the cover plate; the back-pushing piston body is provided with two or more than two limiting grooves, the limiting grooves are provided with limiting members capable of being connected with the steel strand, and the working anchor clamping plate is installed on the cover plate through fastening bolts. The tensioning top assembly and the back-pushing assembly are provided with hydraulic oil connectors capable of being communicated with the oil pump assembly.

2. The tensioner for slope cable according to claim 1, characterized in that: The tensioning top assembly is combined by a tensioning top oil cylinder body and a tensioning top piston body, the tensioning top oil cylinder body is provided with a hollow tensioning top through sleeve, the tensioning top piston body is arranged between the tensioning top oil cylinder body and the tensioning top through sleeve, and an anchor end fixing member is arranged at the top of the tensioning top piston body; a first plug is arranged between the lower part of the tensioning top oil cylinder body and the tensioning top through sleeve, and a second plug is arranged between the bottom of the tensioning top oil cylinder body and the tensioning top through sleeve.

3. The tensioner for slope cable according to claim 1, characterized in that: The limiting member comprises an elastic limiting body, a pre-tightening spring and an elastic force adjusting nut, the elastic limiting body is provided with a trumpet-shaped through hole structure, the elastic limiting body and the pre-tightening spring are nested and installed in the limiting groove, and the tail end of the pre-tightening spring is provided with an elastic force adjusting nut for adjusting the elastic force.

4. The tensioner for slope cable according to claim 2, characterized in that: The anchor end fixing member comprises a tool anchor end for connecting the steel strand, a displacement flange and a tensioning top clamping port protection plate, the tool anchor end is connected with the top of the tensioning top piston body through the tensioning top clamping port protection plate, the displacement flange is sleeved on the outside of the tool anchor end and is fixedly connected with the top of the tensioning top piston body.

5. The tensioner for slope cable according to claim 4, characterized in that: Two ends of the displacement flange are provided with handles.

6. The tensioner for slope cable according to claim 1, characterized in that: A transparent observation window is arranged on the outer wall of the back-pushing cylinder.

7. The tensioner for slope cable according to claim 2, characterized in that: A first oil seal assembly is arranged between the back-pushing piston body and the back-pushing cylinder, and a second oil seal assembly is arranged between the tensioning top piston body and the tensioning top oil cylinder body.

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