CN116254832A - A kind of prestressed anchor cable device and using method - Google Patents

Abstract

The embodiment of the application discloses a prestressed anchorage cable device and application method thereof, and the prestressed anchorage cable device provided by the embodiment of the application includes: the hydraulic expansion device comprises an anchor rope, a hydraulic expansion device and a stress compensation system, wherein one end of the anchor rope is fixed inside a side slope rock body, the hydraulic expansion device is connected to the other end of the fixed anchor rope, when the stress of the anchor rope is reduced, the internal hydraulic pressure of the hydraulic expansion device is reduced, the stress compensation system comprises hydraulic oil and a hydraulic energy accumulator, the hydraulic oil is arranged inside the hydraulic energy accumulator, the hydraulic energy accumulator is communicated with the hydraulic expansion device, and the hydraulic pressure of the hydraulic expansion device is positively correlated with the stress received by the anchor rope. In a specific application scene, the hydraulic expansion device is communicated with the stress compensation system, the stress compensation system is consistent with the internal hydraulic pressure of the hydraulic expansion device, and when the tension of the anchor cable is reduced, the stress compensation system can supplement oil pressure to the hydraulic expansion device through the hydraulic energy accumulator, so that the hydraulic expansion device is stretched and deformed, and the tension of the prestressed anchor cable is increased.

Description

A kind of prestressed anchor cable device and using method

technical field

The embodiment of the present application relates to the technical field of mining engineering, and in particular to a prestressed anchor cable device and a method of use.

Background technique

In the field of geotechnical engineering, the use of prestressed anchor cables to reinforce slopes is one of the common and reliable reinforcement methods. The prestressed anchor cables are flexible, have good seismic resistance and ductility, and can strengthen rock and soil in deep layers. It can actively control the deformation of the rock mass, adjust the stress state of the soil mass, and is beneficial to the stability of the rock mass. Therefore, the prestressed anchor cable is of great significance to the stability of the rock slope and the construction safety. However, the traditional prestressed anchor cable Under the long-term influence of external conditions such as rock mass deformation, temperature change and blasting vibration, its anchoring force will decrease to a certain extent, which will seriously affect the anchoring effect;

Especially for the open-pit mine slopes in the alpine regions of our country, which are under the condition of coupled freeze-thaw cycle and blasting vibration all the year round, the slope rock mass anchored by prestressed anchor cables is affected by the frost heave effect of the inner rock joints in the alpine region and the blasting dynamics during construction. The load and rock creep under long-term anchorage will lead to a decrease in the prestress of the anchor cable, or even cause anchorage failure, thereby inducing disasters such as landslides. The solutions can be roughly divided into two categories: that is, to make up for the prestress loss of the anchor cable by means of storing elastic energy such as over-tensioning or adding springs and doing work twice, but both of these two methods have inherent defects: on the one hand, The energy storage capacity of the elastic energy storage device is limited, for example, limited by the stroke of the second anchor disk spring at the anchor head, the anchoring force still has stress loss after a long time, and it is difficult to replenish energy; on the other hand, the secondary tension Pulling generally cannot achieve timely stress compensation, which will increase construction costs, and there is a certain degree of danger in re-tensioning the anchor cable in areas where the anchorage position is steep and it is difficult for personnel to reach the area.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, the first aspect of the present invention provides a prestressed anchor cable device.

A second aspect of the invention provides a method of use.

In view of this, according to the first aspect of the embodiment of the present application, a prestressed anchor cable device is proposed, including:

An anchor cable, one end of the anchor cable is used to be fixed inside the rock mass of the slope;

a hydraulic expansion device, the hydraulic expansion device is connected to the other end of the fixed anchor cable;

A stress compensation system, the stress compensation system includes hydraulic oil and a hydraulic accumulator, the hydraulic oil is arranged inside the hydraulic accumulator, and the hydraulic accumulator communicates with the hydraulic expander;

Wherein, the hydraulic pressure of the hydraulic expander is positively correlated with the stress on the anchor cable.

In a feasible implementation manner, the hydraulic expander includes:

A fixing part, one side of the fixing part is used to cling to the rock mass of the slope, and the fixing part adopts a tubular structure with one side opening;

a moving part, the moving part is hollow inside, the moving part is arranged inside the fixed part and the moving part is slidably connected to the fixed part;

One side of the moving part protrudes from the fixed part through the opening on the fixed part;

One end of the moving part protruding from the fixed part is provided with an anchor cable hole;

An anchor cable hole is provided at one end of the fixing part close to the rock mass of the slope.

In a feasible implementation manner, the hydraulic expander includes:

an oil injection chamber, the fixed part and the moving part are enclosed to form the oil injection chamber;

The oil injection chamber communicates with the stress compensation system.

In a feasible implementation manner, the anchor cables include one or more anchor cables, and the anchor cables of each unit include several unbonded steel strands.

In a feasible implementation manner, the hydraulic expander further includes:

A first anchor plate, the first anchor plate is arranged on the side where the moving part protrudes from the inside of the fixed part, and a plurality of holes through which the anchor cables can pass are opened on the first anchor plate;

A fixing piece, the fixing piece is fixedly connected to one end of the anchor cable passing through the first anchor plate.

In a feasible implementation manner, the hydraulic expander also includes:

A second anchor plate, the second anchor plate is arranged between the fixing part and the rock mass of the slope, and the second anchor plate is provided with a plurality of holes through which anchor cables can pass.

In a feasible implementation manner, the stress compensation system further includes:

a hydraulic servo valve, the hydraulic servo valve is in communication with the hydraulic expander;

a conduit, one end of the conduit communicates with the hydraulic valve, and the other end of the conduit communicates with the hydraulic accumulator;

An oil supply valve, the oil supply valve is arranged on the hydraulic accumulator.

In a feasible implementation manner, the stress compensation system further includes:

A pressure monitoring assembly for monitoring the pressure inside the hydraulic accumulator and hydraulic expander.

According to the second aspect of the embodiment of the present application, a method of use is proposed, including

The anchor cable is arranged on the side rock slope body to be fixed;

communicating the hydraulic expander with the stress compensation system;

The pressure of the hydraulic expander and the stress compensation system are balanced;

Based on the change of the tension of the anchor cable, the hydraulic expander and the stress compensation system are controlled to change the oil pressure.

In a feasible implementation manner, the prestressed anchor cable is arranged on the side rock slope body to be fixed, including:

Excavating anchor holes, the anchor holes pass through the slip surface of the side rock slope and extend into the stable rock mass;

Make one end of the anchor cable extend into the anchor hole, and the other end pass through the hydraulic expansion device and pass out from the hydraulic expansion device;

Grouting reinforcement to the anchor hole;

Prestress the anchor cables.

Compared with the prior art, the present invention at least includes the following beneficial effects: the prestressed anchor cable device provided by the embodiment of the application includes: an anchor cable, a hydraulic expansion device and a stress compensation system, wherein one end of the anchor cable is used to extend into the anchor cable to be fixed The rock mass of the slope is poured with concrete to form the anchor section and fixed together with the rock mass. The hydraulic expander is connected to the other end of the fixed anchor cable. When the stress of the anchor cable decreases, the internal hydraulic pressure of the hydraulic expander decreases. The stress compensation system includes hydraulic oil and a hydraulic accumulator. The hydraulic oil is set inside the hydraulic accumulator, and the hydraulic accumulator The energy device is connected with the hydraulic expansion device, and the hydraulic pressure of the hydraulic expansion device is positively correlated with the stress on the anchor cable. In a specific application scenario, the prestressed anchor cable device is installed on the rock and soil slope that needs to be anchored, and prestress is applied to the anchor cable. Due to the vibration coupling effect, the prestress of the anchor cable will be lost due to the long-term influence of external conditions such as rock mass deformation, temperature change, and blasting vibration. In order to make up for the loss of anchor cable prestress caused by these factors, firstly, carry out geological survey and mechanical calculation or numerical simulation research on the slope, and design the slope anchor scheme, including anchor cable reinforcement depth, anchor section length, layout grid and quantity, and Select the type of anchor cable, determine the number of anchor cables in a single hole, the anchoring force of a single hole, etc. Secondly, during the anchor cable installation process, install the anchor cable in each anchor cable installation hole according to the design requirements, ensure the anchor length and grout the anchor section, and level the surface of the rock mass at the anchor hole hole, or construct The concrete base is prepared for subsequent installation and prestressing. Thirdly, when the strength of the anchorage section meets the design requirements, install it outside the slope and apply prestress, and pass the anchor cable through the anchor plate, hydraulic expansion device and out of the anchor head in sequence. Then, use a jack to apply pulling force to multiple anchor cables in sequence, so that the prestress reaches the target value, and then apply the required prestress to the anchor cables and then lock the end that extends into the hydraulic expansion device to ensure tension. After locking, the airtightness of the device is good. At this time, the displacement of the hydraulic expander is compressed to the minimum, and then the hydraulic expander is connected to the stress compensation system. The stress compensation system is consistent with the internal hydraulic pressure of the hydraulic expander. When the tension of the anchor cable decreases When the hydraulic expander receives less resisting force and the internal hydraulic pressure decreases, the stress compensation system can supply oil pressure to the hydraulic expander through the hydraulic accumulator to make it elongate and deform and increase the tension of the prestressed anchor cable. The embodiment realizes the stress compensation function through the hydraulic expander and the stress compensation system, and the self-adaptive effect according to the effect of thermal expansion and cold contraction under temperature changes.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the application. Also throughout the drawings, the same reference numerals are used to designate the same parts. In the attached picture:

Fig. 1 is the structural block diagram of the prestressed anchor cable device of a kind of embodiment that the application provides;

FIG. 2 is a schematic diagram of an application scenario of a prestressed anchor cable device according to an embodiment of the present application;

FIG. 3 is a partially enlarged schematic diagram of a prestressed anchor cable device according to an embodiment of the present application;

Fig. 4 is a schematic flow chart of the steps of the control method of the prestressed anchor cable device according to an embodiment of the present application;

Fig. 5 is a schematic flow chart of steps for setting the prestressed anchor cable on the side rock slope to be fixed according to an embodiment of the present application.

Wherein, the corresponding relationship between reference numerals and component names in Fig. 1 is:

100. Anchor cable; 200. Hydraulic expander; 300. Stress compensation system;

210, the fixed part; 220, the moving part; 230, the oil injection chamber; 240, the first anchor plate; 250, the fixing part; 260, the second anchor plate;

310, hydraulic oil; 320, hydraulic accumulator; 330, hydraulic servo valve; 340, conduit; 350, oil supply valve.

Detailed ways

In order to better understand the above technical solutions, the technical solutions of the embodiments of the present application will be described in detail below through the accompanying drawings and specific examples. It should be understood that the embodiments of the present application and the specific features in the embodiments are the technical solutions of the embodiments of the present application. A detailed description, rather than a limitation to the technical solutions of the present application, the embodiments of the present application and the technical features in the embodiments can be combined with each other under the condition of no conflict.

As shown in Figures 1-3, according to the first aspect of the embodiment of the present application, a prestressed anchor cable device is proposed, including: an anchor cable 100, one end of the anchor cable 100 is used to be fixed inside the rock mass of the slope; Hydraulic telescopic device 200, the hydraulic telescopic device 200 is connected to the other end of the fixed anchor cable 100; stress compensation system 300, the stress compensation system 300 includes hydraulic oil 310 and hydraulic accumulator 320, the hydraulic oil 310 It is arranged inside the hydraulic accumulator 320 , and the hydraulic accumulator 320 communicates with the hydraulic expander 200 ; wherein, the hydraulic pressure of the hydraulic expander 200 is positively correlated with the stress on the anchor cable 100 .

The prestressed anchor cable device provided in the embodiment of the present application includes: an anchor cable 100, a hydraulic expansion device 200 and a stress compensation system 300, wherein one end of the anchor cable 100 is used to extend into the slope rock mass to be fixed, and the hydraulic expansion device 200 Connected to the other end of the fixed anchor cable 100, when the stress of the anchor cable 100 decreases, the internal hydraulic pressure of the hydraulic expander 200 decreases, and the stress compensation system 300 includes a hydraulic oil 310 and a hydraulic accumulator 320, and the hydraulic oil 310 is set in the hydraulic accumulator 320, the hydraulic accumulator 320 is connected with the hydraulic expander 200, and the hydraulic pressure of the hydraulic expander 200 is positively correlated with the stress on the anchor cable 100. In specific application scenarios, the prestressed anchor cable device is installed on the On the rock and soil slope, the anchor cable 100 is prestressed. In the project, the open-pit mine slope located in the alpine area is under the coupling effect of freeze-thaw cycle and blasting vibration all the year round. Due to external conditions such as rock mass deformation, temperature change, and blasting vibration Under the long-term influence of the anchor cable 100, the prestress of the anchor cable 100 will be lost. In order to make up for the loss of the anchor cable 100 prestress caused by these factors, firstly, the position and depth of the anchorage need to be calculated through the geological survey of the slope, and then, artificially Slowly put 100 pieces of the anchor cable into the hole, measure the length of the steel strand exposed outside the hole with a steel ruler, calculate the length of the anchor cable 100 in the hole (the error is controlled within the range of 50mm), and ensure the anchoring length. The anchor cable 100 passes through the hydraulic expansion device 200 and passes out from the hydraulic expansion device 200. The hydraulic expansion device 200 is connected and fixed with the slope with concrete, and then the anchorage section is grouted. Apply a pulling force to make the prestress reach the target value, then apply the required prestress to the anchor cable 100 and then lock the end extending into the hydraulic expansion device 200 to ensure that the airtightness of the device is good after tensioning and locking. At this time, the displacement of the hydraulic expander 200 is compressed to the minimum, and then the hydraulic expander 200 is connected to the stress compensation system 300, and the stress compensation system 300 is consistent with the internal hydraulic pressure of the hydraulic expander 200. When the tension of the anchor cable 100 decreases, The resistance force received by the hydraulic expansion device 200 is reduced, and the internal hydraulic pressure is reduced, so the stress compensation system 300 can supplement the oil pressure to the hydraulic expansion device 200 through the hydraulic accumulator 320 to make it elongate and deform, and increase the tension of the prestressed anchor cable. It can automatically compensate the 100% prestress of the anchor cable when the 100% prestress of the anchor cable is lost under various engineering problems. The problem of tension reduces the safety hazards of personnel during the construction process.

As shown in Figures 1-3, in some examples, the hydraulic expander 200 includes: a fixing part 210, one side of the fixing part 210 is used to cling to the slope rock mass, and the fixing part 210 adopts a single side Open tubular structure; moving part 220, the inside of the moving part 220 is hollow, the moving part 220 is arranged inside the fixed part 210 and the moving part 220 is slidably connected to the fixed part 210; the moving part 220 One side protrudes from the fixed part 210 through the opening on the fixed part 210; the end of the moving part 220 protruding from the fixed part 210 is provided with an anchor cable 100 hole; the end of the fixed part 210 close to the slope rock mass is provided with an anchor cable 100 holes.

In this technical solution, the hydraulic expansion device 200 includes a fixed part 210 and a moving part 220, one side of the fixed part 210 is used to be close to the side rock slope, and the moving part 220 is slidably connected to the fixed part 210, and the When the anchor cable 100 is fixed, one end of the anchor cable 100 passes through the anchor cable 100 hole of the fixed part 210 and is flexibly connected with the anchor cable 100, and one end of the anchor cable 100 passes through the fixed part 210 and then passes through the anchor cable 100 of the moving part 220 hole and is fixedly connected with the moving part 220. When the prestressed anchor cable device is put into use, the moving amount of the moving part 220 relative to the fixed part 210 is compressed to the minimum, and the prestress of the anchor cable 100 resists the hydraulic pressure of the hydraulic expansion device 200. When the tension on the anchor cable 100 decreases, the resistance of the anchor cable 100 to the moving part 220 decreases, the internal hydraulic pressure of the hydraulic expansion device 200 acts on the moving part 220, and the moving amount of the moving part 220 relative to the fixed part 210 increases, and is again The anchor cable 100 applies tension to keep the stress on the anchor cable 100 not lower than a required value.

As shown in FIGS. 1-3 , in some examples, the hydraulic expander 200 includes: an oil injection chamber 230 , the fixed part 210 and the moving part 220 enclose the oil injection chamber 230 , and the oil injection chamber 230 Connected to the stress compensation system 300 .

In this technical solution, the hydraulic expander 200 also includes an oil injection cavity 230, which is surrounded by a fixed part 210 and a moving part 220. The oil injection cavity 230 is connected to the stress compensation system 300. In actual use, After the anchor cable 100 is fixed, the hydraulic oil 310 is injected into the oil injection chamber 230, and the internal hydraulic pressure of the hydraulic expander 200 is realized by the hydraulic oil 310 and the hydraulic chamber. Acting on the moving part 220 , at the same time, the stress compensation system 300 replenishes the hydraulic oil 310 to the oil injection chamber 230 to maintain a constant hydraulic pressure in the oil injection chamber 230 .

As shown in FIGS. 1-3 , in some examples, the anchor cables include one or more anchor cables, and each unit of the anchor cables includes several unbonded steel strands.

In this technical solution, a pressure-dispersing anchor cable 100 is used, which is composed of one or more anchor cables 100, and each unit anchor cable 100 is composed of several unbonded steel strands, and the steel strands are φj15.24mm And φj12.7mm high-strength, low-relaxation unbonded prestressed steel strands, set a wire ring every 1.0-1.5m along the axial direction of the anchor cable 100, to ensure that the thickness of the anchor cable 100 protective layer is not less than 20mm.

As shown in FIGS. 1-3 , in some examples, the hydraulic expander 200 further includes: a first anchor plate 240 , and the first anchor plate 240 is disposed inside the fixed portion 210 when the moving portion 220 protrudes from the fixed portion 210 One side of the first anchor plate 240 is provided with a number of holes for anchor cables to pass through; the fixing member 250, the fixing member 210 is fixedly connected to the anchor cable 100 and passes through the first anchor plate 240 one end.

In this technical solution, the hydraulic expansion device 200 also includes a first anchor plate 240 and a fixing member 250, wherein after the anchor cable 100 is connected in series with the fixed part 210 and the moving part 220, the anchor cable 100 passes through the first anchor plate 240, and the anchor cable 100 passes through the first anchor plate 240. 100 after prestress is applied, the end of the anchor cable 100 protruding from the first anchor plate 240 is locked through the fixing member 250. The setting of the fixing member 250 can ensure the stability of the anchor cable 100 after the prestress is applied, and can prevent the anchor cable 100 from occurring. retracted, the first anchor plate 240 is arranged between the moving part 220 and the fixing part 250, so as to expand the force-bearing area of the moving part 220, avoid damage to the moving part 220 caused by excessive stress, and at the same time further maintain the strength of each unit anchor cable 100. The unbonded stranded wires can be tightly twisted to avoid loosening, further improving the stability of this embodiment.

As shown in Figures 1-3, in some examples, the hydraulic expander 200 further includes: a second anchor plate 260, the second anchor plate 260 is arranged between the fixed part 210 and the slope rock mass, The second anchor plate 260 is provided with a plurality of holes through which the anchor cables can pass.

In this technical solution, a second anchor plate 260 is added between the slope rock mass and the fixed part 210 to increase the stress area, disperse the pressure on the slope rock mass, and avoid the collapse of the slope rock mass due to excessive stress concentration. Further improve the service life of this embodiment.

As shown in FIGS. 1-3 , in some examples, the stress compensation system 300 further includes: a hydraulic servo valve 330 , the hydraulic servo valve 330 communicates with the hydraulic expander 200 ; a conduit 340 , the conduit 340 One end of the conduit 340 communicates with the hydraulic valve, and the other end of the conduit 340 communicates with the hydraulic accumulator; an oil supply valve 350, and the oil supply valve 350 is arranged on the hydraulic accumulator.

In this technical solution, the stress compensation system 300 includes a hydraulic servo valve 330, a conduit 340, an oil supply valve 350, and also includes a hydraulic oil 310 and a hydraulic accumulator 320, wherein the stress compensation system 300 communicates with all For the hydraulic expander 200, when the hydraulic pressure in the hydraulic expander 200 decreases, the hydraulic servo valve 330 is activated, and the hydraulic oil 310 in the hydraulic accumulator 320 is delivered to the hydraulic expander 200 through the conduit 340 to supplement the hydraulic expander 200. At the same time, an oil supply valve 350 is provided at the tail of the hydraulic accumulator 320 to supply hydraulic oil 310 to the interior of the hydraulic accumulator 320 .

As shown in FIGS. 1-3 , in some examples, the stress compensation system 300 further includes: a pressure monitoring component for monitoring the pressure inside the hydraulic accumulator and the hydraulic expander 200 .

In this technical solution, a pressure monitoring component is added to monitor the oil pressure of the hydraulic expander 200 and the accumulator, and the oil pressure monitoring signal data is networked and transmitted to the cloud and the data center through a big data connection to realize remote online monitoring of the device , the application of this technology ensures that the change of the oil pressure value can be supplemented twice, so that the device can always maintain a high stress bearing capacity during long-term use. Not only that, when the monitoring finds that the internal oil pressure of the hydraulic expander 200 rises abnormally, It may be that the prestressed anchor cable is elongated by the deformation of the jointed rock mass. At this time, timely conduct disaster prevention observations on the slope at the abnormal data to avoid property and personnel safety losses.

As shown in Figure 4, according to the second aspect of the embodiment of the present application, a method of use is proposed, which is applied to any of the above-mentioned prestressed anchor cable devices, including:

Step 110: the prestressed anchor cable is set on the side rock slope to be fixed;

Step 120: Connecting the hydraulic expander with the stress compensation system;

Step 130: the pressures of the hydraulic expander and the stress compensation system are balanced;

Step 140: Based on the change of the tension of the anchor cable, control the hydraulic expansion device and the stress compensation system to change the oil pressure.

It can be understood that, in the process of step 120, the pulling force is sequentially applied to the anchor cable by the jack to make it reach the target value, and then the anchor cable and the hydraulic expander are fixedly connected. At this time, the displacement of the hydraulic expander is compressed At the lowest point, the internal oil pressure and its resistance to the tension of the anchor cable are balanced. When the tension of the anchor cable decreases, the stress compensation device will supplement the oil pressure to the hydraulic expander to make it elongate and deform, increasing the tension of the prestressed anchor cable.

It can be understood that after the installation of the prestressed anchor cable is completed in the process of step 130, the operator can inject a certain amount of hydraulic oil into the hydraulic telescopic device through the automatic servo system of the stress compensation system to cause a small amount of elongation deformation to test the The reliability and stability of the stress compensation mechanism.

As shown in Figure 5, in some examples, the prestressed anchor cable is arranged on the side rock slope to be fixed including:

Step 111: Excavating anchor holes, the anchor holes pass through the slip surface of the side rock slope and extend into the stable rock mass;

Step 112: extending one end of the anchor cable into the anchor hole;

Step 113: Carry out grouting reinforcement to the anchor hole;

Step 114: Pass the other end through and out of the hydraulic retractor.

In this technical scheme, concrete is used to connect and fix the hydraulic expansion device with the slope, and then the anchorage section is grouted, and cement mortar is used for grouting, and the construction mix ratio is determined after the comparison and selection of the test. The actual grouting amount is generally greater than the theoretical one. The amount of grouting, or the standard that the grouting is finished when the vent hole of the anchorage is no longer vented and the grout at the hole overflows the thick grout.

In the present invention, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or two above, unless expressly limited otherwise. The terms "installation", "connection", "connection", "fixed" and other terms should be interpreted in a broad sense, for example, "connection" can be fixed connection, detachable connection, or integral connection; "connection" can be directly or indirectly through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear" etc. is based on the orientation shown in the drawings Or positional relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the referred device or unit must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation of the present invention.

In the description of this specification, descriptions of the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in the present invention In at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A pre-stressed anchor cable assembly, comprising:

one end of the anchor cable is used for being fixed in the slope rock mass;

the hydraulic expansion device is connected with the other end of the anchor cable;

the stress compensation system comprises hydraulic oil and a hydraulic accumulator, wherein the hydraulic oil is arranged in the hydraulic accumulator, and the hydraulic accumulator is communicated with the hydraulic telescopic device;

the hydraulic pressure of the hydraulic telescopic device is positively correlated with the stress born by the anchor cable.

2. The pre-stressed anchor cable assembly of claim 1, wherein the hydraulic jack comprises:

the fixing part is used for clinging to the slope rock mass, and adopts a tubular structure with an opening at one side;

a moving part, wherein the moving part is hollow, is arranged in the fixed part and is connected with the fixed part in a sliding way;

one side of the moving part extends out of the fixing part through an opening on the fixing part;

an anchor cable hole is formed in one end, extending out of the fixed part, of the moving part;

and an anchor rope hole is formed in one end, close to the slope rock mass, of the fixing part.

3. The pre-stressed anchor cable assembly of claim 2, wherein the hydraulic jack comprises:

an oil injection cavity, wherein the fixed part and the moving part are enclosed to form the oil injection cavity;

the oiling cavity is communicated with the stress compensation system.

4. The pre-stressed anchor cable assembly of claim 1, wherein:

the anchor cable comprises one or more anchor cables, and each anchor cable of each unit comprises a plurality of unbonded steel strands.

5. The pre-stressed anchor cable assembly of claim 2, wherein the hydraulic jack further comprises:

the first anchor disc is arranged on one side of the moving part extending out of the fixed part, and a plurality of holes through which the anchor cables can pass are formed in the first anchor disc;

the fixing piece is fixedly connected to one end of the anchor rope penetrating through the first anchor disc.

6. The pre-stressed anchor cable assembly of claim 5, wherein the hydraulic jack further comprises:

the second anchor disc is arranged between the fixed part and the slope rock body, and a plurality of holes through which the anchor cables can pass are formed in the second anchor disc.

7. The pre-stressed anchor cable assembly of claim 1, wherein the stress compensation system further comprises:

the hydraulic servo valve is communicated with the hydraulic telescopic device;

one end of the conduit is communicated with the hydraulic valve, and the other end of the conduit is communicated with the hydraulic accumulator;

and the oil supply valve is arranged on the hydraulic energy accumulator.

8. The pre-stressed anchor cable assembly of claim 7, wherein the stress compensation system further comprises:

and the pressure monitoring assembly is used for monitoring the pressure inside the hydraulic accumulator and the hydraulic telescopic device.

9. A method of use for the pre-stressed anchor line arrangement of any one of claims 1 to 8, comprising:

the prestressed anchor cable is arranged on a side rock slope body to be fixed;

communicating the hydraulic jack with the stress compensation system;

the pressure of the hydraulic telescopic device and the pressure of the stress compensation system reach balance;

and controlling the hydraulic expansion device and the stress compensation system to carry out oil pressure change based on the tension change of the anchor cable.

10. The method of claim 9, wherein the pre-stressed anchor cable is disposed on a side rock slope to be secured, comprising:

an anchor hole is drilled, the anchor hole penetrates through the sliding surface of the Bian Yanpo body and extends into the stable rock mass;

one end of the anchor cable extends into the anchor hole, and the other end of the anchor cable penetrates through the hydraulic telescopic device and extends out of the hydraulic telescopic device;

grouting and reinforcing the anchoring holes.

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