JP2024505110A - Anchor cable for grouting with large deformation, constant resistance and support function - Google Patents

Abstract

An anchor cable for grouting, ie, an NPR anchor cable for grouting, which has large deformation, constant resistance, and support function. [Solution] The anchor cable for grouting, which has large deformation, constant resistance, and support function, that is, the NPR anchor cable for grouting, has an anchor cable body, and the end of the anchor cable body has an excavated hole in the surrounding rock. (11), a constant resistance device comprising an anchor cable body provided with a fixing segment (18), which is used for fixing to the bottom of the hole, a constant resistance body (4) and a constant resistance sleeve (6); The constant resistance element (4) is fitted around the outer periphery of the anchor cable body, the constant resistance sleeve (6) is fitted around the outer periphery of the constant resistance element (4), and the constant resistance element (4) is fitted around the outer periphery of the anchor cable body. 6) a constant resistance device used to move the anchor cable with a constant resistance along the axial direction; and a constant resistance device seal assembly provided at the terminal of the constant resistance device, the constant resistance device seal The assembly is used to close the gap between the anchor cable body and the borehole (11) in the surrounding rock, the constant resistance device presses the constant resistance device seal assembly, and the pallet (3) and an anchor (2), wherein the anchor (2) and the pallet (3) are both provided at one end with the anchor cable body protruding from the borehole (11) in the surrounding rock. , a fixing assembly used to fixedly lock the anchor cable body after the tension of the anchor cable body reaches a design preload force. [Selection diagram] Figure 1

Description

The present invention belongs to the technical field of tunnel support, and specifically relates to a grouting anchor cable with large deformation, constant resistance and support functions, that is, an NPR grouting anchor cable.

In underground construction, anchor cables are widely used as initial support structures with high reinforcement effects. As underground construction progresses towards the Qingzang Plateau, tunnels will inevitably pass through faults, and most of the material in the fault zone is fractured rock, fault gravel, joints, and the growth of micro-cracks, and the rock body is It is crushed and exhibits a crushed gravel-like structure, which is disadvantageous to the stability of the fixed end of the anchor cable. By grouting, a stone body is formed in the internal joints, micro-cracks and cavities of the surrounding rock, improving the strength, stability, wholeness and seepage prevention performance of the surrounding rock, and improving the internal cracks of the surrounding rock. It can effectively suppress the growth of microorganisms, thereby achieving the purpose of improving the physico-mechanical properties of the surrounding rocks. The surrounding rock after grouting and reinforcing can obtain higher strength and integrity, which can provide high fixing force to the anchor cable, and grouting can increase the thickness of the combined arch and increase the prestress of the anchor cable. It is advantageous in transmitting stress to deep parts. The NPR anchor cable for grouting injects grout into the rocks surrounding the fault fracture zone to strengthen it, improve the strength and integrity of the surrounding rocks, and more advantageously perform the anchor cable and suspension action. Guarantees the stability of surrounding rocks.

However, the conventional NPR anchor cable for grouting has poor sealing properties, so the grouting fixing effect cannot be guaranteed.

Therefore, it is necessary to provide a technical solution that improves on the deficiencies of the prior art.

The purpose of the present invention is to provide a grout with large deformation, constant resistance, and support function to at least solve the problem that the NPR anchor cable for grouting in the current prior art has poor sealing properties and cannot guarantee fixation of grouting. An object of the present invention is to provide an anchor cable for grouting, that is, an NPR anchor cable for grouting.

In order to achieve the above object, the present invention provides the following technical solution.

An anchor cable body, the anchor cable body including an anchor cable body having a fixing segment at an end thereof used for fixing to the bottom of a borehole, a constant resistance body, and a constant resistance sleeve. In the constant resistance device, the constant resistance body is fitted around the outer periphery of the anchor cable main body, the constant resistance sleeve is fitted around the outer periphery of the constant resistance body, and the constant resistance body is anchored in the constant resistance sleeve. a constant resistance device used to move with constant resistance along the axial direction of a cable; and a constant resistance device seal assembly provided at an end of the constant resistance device, the constant resistance device seal assembly being installed at the end of the constant resistance device; The constant resistance device is used to close a gap between a body and a wellbore, and the constant resistance device includes a constant resistance device seal assembly that presses the constant resistance device seal assembly, and a fixing assembly that includes a pallet and an anchor. are both provided at one end where the anchor cable body protrudes from the excavation hole in the surrounding rock, and are used to securely lock the anchor cable body after the tension of the anchor cable body reaches the design preload force. an NPR anchor cable for grouting, the constant resistance device seal assembly being fitted around the outer periphery of the anchor cable body and the bottom of the constant resistance sleeve; A seal ring is used to seal the bottom of the constant resistance sleeve, and a grout stop is provided between the anchor cable body and the borehole and is used to close the gap and increase the pressure of grouting. a pressing member provided between the seal ring and the grout stopper and used to transmit the pressing force of the constant resistance device to the grout stopper, the pressing member being an I-shaped pusher; The I-shaped push tube includes a pressing member fitted onto the anchor cable body, and the I-shaped push tube has a cross-sectional shape near one end of the constant resistance device that is the same as the seal ring. , the cross-sectional shape of the I-shaped push tube near one end of the grout stopper is the same as the grout stopper, the end of the constant resistance sleeve is provided with a flange rim, and the pallet has a constant resistance fitted around the outer circumference of the sleeve and pressed against the surrounding rock by the flange rim of the constant resistance sleeve;
The anchor is a clip-type anchor, and the clip-type anchor is fitted around the outer periphery of the anchor cable body and abuts and contacts the constant resistance body, the NPR anchor cable for grout injection.

The corresponding NPR anchor cable for grouting has better grouting efficiency. The anchor cable body has a hollow structure and a grout injection core pipe, so there is no need to bundle the grout injection pipe and exhaust pipe on site, and counter pressure grout injection is adopted, reducing the probability of cavitation cavitation. At the same time, the grouted nylon pipe is used in conjunction with the grouted steel pipe and the grout stopper is arranged to improve the sealing effect and significantly improve the grouting efficiency. Also, by providing two seal assemblies, grouting can be effectively prevented. It also maximizes the grout injection pressure and greatly improves the grout injection fixing effect. The NPR anchor cable for grouting has the characteristics of large deformation, high carrying capacity and no grout leakage.

It is a schematic diagram of the overall configuration of an NPR anchor cable for grout injection. FIG. 3 is a structural schematic diagram of an anchor cable seal assembly. FIG. 2 is a structural schematic diagram of a constant resistance device seal assembly. It is a sectional view of a grout outlet.

As shown in FIGS. 1 to 4, according to a specific embodiment of the present invention, the present invention provides an anchor cable body, wherein the end of the anchor cable body is configured to be fixed to the bottom of an excavation hole. The constant resistance device used includes an anchor cable body provided with a fixed segment 18, a constant resistance body and a constant resistance sleeve 6, the constant resistance body being fitted around the outer periphery of the anchor cable body, and a constant resistance device including a constant resistance body and a constant resistance sleeve 6. The sleeve 6 is fitted around the outer periphery of the constant resistance body 4, and the constant resistance body has a constant resistance device and a constant resistance device, which are used in the constant resistance sleeve 6 to move with a constant resistance along the axial direction of the anchor cable. a constant resistance device seal assembly provided at the terminal of the constant resistance device seal assembly, the constant resistance device seal assembly is used to close the gap between the anchor cable body and the wellbore, and the constant resistance device presses the constant resistance device seal assembly. a constant resistance device seal assembly, and a fixed assembly comprising a pallet 3 and an anchor 2, the anchor 2 and the pallet 3 both being provided at one end where the anchor cable body protrudes from the borehole 11 in the surrounding rock. A grouting anchor with large deformation, constant resistance and support function, including a fixing assembly, which is used to fixedly lock the anchor cable body after the tension of the anchor cable body reaches the design preload force. An NPR anchor cable for grouting is provided.

By installing a seal assembly at the end of the constant resistance device, it is possible to seal the gap between the drilling hole and the anchor cable body, which is convenient for increasing the grout injection pressure, and the grout in the drilling hole has a constant resistance. It can avoid flooding the device and ensure that the constant resistance device does not come into contact with the grout.

The constant resistance device seal assembly includes a seal ring 7, a grout stopper 10, and a pressing member. The seal ring 7 is fitted around the outer periphery of the anchor cable body and the bottom of the constant resistance sleeve 6, and is used to seal the bottom of the constant resistance sleeve 6. In other embodiments, the seal ring 7 and the constant resistance sleeve 6 may be integrally constructed; in this embodiment, the seal ring 7 and the constant resistance sleeve 6 are provided separately, which facilitates manufacturing and installation. It can be done.

The grout stopper 10 is provided between the anchor cable body and the excavation hole, and is used to close the gap and increase the pressure of grout injection. In this embodiment, the grout stopper 10 has a round tube shape, the portion of the grout stopper 10 that protrudes into the excavation hole 11 in the surrounding rock is a small diameter segment, and the grout stopper 10 has a diameter enlargement excavation hole 9. The portion located at Make it fit. The pressing member is provided between the seal ring 7 and the grout stopper 10 and is used to transmit the pressing force of the constant resistance device to the grout stopper 10. The grouting stopper 10 is brought into contact with the constant resistance device through the pressing member to ensure that the grouting stopper 10 does not easily escape from the excavation hole 11 in the surrounding rock, so that the grouting stopper 10 always maintains the sealing effect. Ensure that you have it.

The pressing member is an I-shaped push tube 8, and the I-shaped push tube 8 is fitted onto the anchor cable body. The cross-sectional shape of the I-shaped push tube 8 near one end of the constant resistance device is the same as that of the seal ring 7, and the cross-sectional shape of the I-shaped push tube 8 near one end of the grout stopper 10 is the same as that of the grout stopper 10. be. The I-shaped push tube 8 can increase the contact area with the seal ring 7 and the grout stopper 10, and can more easily push up the constant resistance device and the grout stopper 10.

A flange rim is provided at the end of the constant resistance sleeve 6, the pallet 3 is fitted around the outer periphery of the constant resistance sleeve 6, and is pressed against the surrounding rock by the flange rim of the constant resistance sleeve 6, and the anchor 2 is clip-type. The clip-type anchor 2 is fitted around the outer periphery of the anchor cable body, and comes into contact with the constant resistor 4.

The flange edge of the constant resistance device presses the pallet 3, and the clip-type anchor 2 does not come into direct contact with the pallet 3, so that after the anchor cable is deformed by an external force, the deformation of the anchor cable is caused by the clip-type anchor 2. At the same time, the constant resistance body 4 is moved toward the inside of the surrounding rock, and the constant resistance body 4 slides with a constant resistance in the constant resistance sleeve 6, realizing constant resistance deformation of the anchor cable, and the NPR anchor cable is It does not break even when deformed, ensuring effective support of the anchor cable at all times.

In this embodiment, the anchor 2 is a clip-type anchor 2, which can provide a preliminary tension of 30t by locking and fixing the anchor after being reversely tensioned by a tensioning device. The pallet 3 can be replaced with an umbrella-shaped fixed pallet 3 and a concave spherical leg mat ring.

The anchor cable body includes a plurality of steel strands 5 and a grout injection pipe 16, the plurality of steel strands 5 are wound around the outer circumference of the grout injection pipe 16, and the length of the steel strands 5 is longer than the length of the grout injection pipe 16. At one end which is larger and projects out of the borehole of the anchor cable body, the steel strands 5 are aligned with the grouting tube 16. In this embodiment, the grout injection pipe 16 is a grout injection steel pipe that can increase the hardness and strength of the anchor cable body. The end of the anchor cable body protruding from the excavation hole is provided with a hollow hexagonal nut 1, the hollow hexagonal nut 1 communicates with the grout injection pipe 16, the hollow hexagonal screw is a grout inlet, and a grout check valve. Used together to facilitate connection with grouting equipment.

In this embodiment, eight steel strands 5 are provided, and the eight steel strands 5 are tightly wound around the grout injection steel pipe, and the steel strands 5 are made of NPR material, so that the corresponding grout injection can be carried out. Make NPR anchor cable have better supporting effect. On the other hand, as a support means for the large deformation of the rock around the fracture, an NPR anchor cable that has both large deformation and a certain support resistance is used as a support member. After the NPR anchor cable for grouting applies preload force to the NPR anchor cable, the anchor cable and the surrounding rock will form an NPR rock structure, which can accommodate the large deformation of the surrounding rock. Meanwhile, after grouting by the grouting steel pipe in the hollow steel strand 5, the totality of the NPR anchor cable and the rocks around the fracture will further increase, forming a thicker combined arch, and the rocks around the fracture will The supporting effect of the rock surrounding the fracture can be greatly enhanced. The NPR anchor cable for grouting combines the installation process of NPR anchor cable with the grouting process, realizing that one hole has two functions, that is, it satisfies the installation of NPR anchor cable and also performs grouting. It can meet demand and make construction more convenient.

A plastic pipe is connected to one end of the grout injection pipe 16 protruding into the excavation hole, a wrap pipe 19 is fitted around the outer periphery of the grout injection pipe 16 and the plastic pipe, and an anchor cable is connected between the plastic pipe and the fixed segment 18. The main body is a grout discharge port 17, which is formed from a grout discharge gap 21 between any adjacent steel strands 5 after the anchor cable body is expanded in diameter.

The wrap pipe 19, the grout injection pipe 16, and the plastic pipe have parts that overlap each other, and the wrap pipe 19 is used to connect the grout injection pipe 16 and the plastic pipe, and the grout injection pipe 16 is used to connect the steel pipe. It is convenient to use to increase the structural strength of the anchor cable body, but the plastic tube is used at the grout outlet position, and the elasticity of the plastic tube is greater, making it convenient for the smooth outflow of the grout. . The grouted steel pipe is a grout rigid transport channel, and the plastic pipe is a grout elastic transport channel.

In this embodiment, the plastic tube is a nylon tube 20, and the nylon tube 20 has high strength and good toughness. By enlarging the diameter of the anchor cable body and forming the grout discharge port 17 using the grout discharge gap 21 between adjacent steel strands 5, it is possible not only to smoothly discharge the grout, but also to make the anchor cable It can ensure that the main body will not be damaged, and the anchor cable main body can always have good structural strength.

A mantle tube 12 is fitted over the anchor cable body, and one end of the mantle tube 12 is located within the constant resistance sleeve 6, and the other end is located in front of the wrap tube 19.

The mantle tube 12 can not only reinforce one segment of the anchor cable body in front of the wrap tube 19, but also provide better sealing properties to the anchor cable body in this segment.

The grouting NPR anchor cable further includes an anchor cable seal assembly located at one end of the mantle tube 12 proximate to the wrap tube 19.

An anchor cable seal assembly is provided at the end of the mantle tube 12 to seal one end of the anchor cable body close to the wrap tube 19, i.e. close to the grout outlet 17 of the anchor cable body, and to seal this grout injection. A double seal is formed in the NPR anchor cable for use, which greatly increases the grouting pressure, so that the NPR anchor cable for grouting has a better grouting fixing effect.

The anchor cable assembly includes an inner sealing tube 15 located between the steel strands 5 and the grout injection tube 16 and corresponding to one end of the jacket tube 12 near the grout outlet 17; 5, the outer sealing tube 13 and the mantle tube 12 include an outer sealing tube 13 having a wrap segment of one segment.

The inner sealing tube 15 can form an internal sealing structure of the steel stranded wire 5, and the outer sealing tube 13 can form an external sealing structure of the steel stranded wire 5, and the steel stranded wire 5 and the grouting tube 16 The anchor cable assembly is located close to the grout outlet 17, and the first seal formed in the borehole 11 in the surrounding rock is more Provide a basis for forming good grouting pressure.

The anchor cable assembly further includes an outer push tube 14 that is externally connected to the outer periphery of the outer seal tube 13 to close the gap between the outer seal tube 13 and the borehole 11 in the surrounding rock. It is fitted and filled between the outer sealing tube 13 and the inner wall of the borehole 11 made of surrounding rock.

Providing the outer pressure tube 14 not only improves the compression effect between the inner sealing tube 15 and the outer sealing tube 13, but also improves the compression effect between the outer sealing tube 13 and the excavation hole 11 in the surrounding rock. can fully fill the gap, so that the anchor cable seal assembly can exhibit better sealing effect.

The procedure for using the NPR anchor cable for grouting is as follows.

First, a drill hole 11 in the surrounding rock is drilled in the rock body, then a diameter enlargement drill hole 9 is machined in the hole segment of the drill hole 11 in the surrounding rock, and then several fixatives are applied to the surrounding rock. The hollow steel stranded wire 5 (assembled anchor cable), which is wrapped around the bottom of the excavation hole 11 in the rock, and then covered with the mantle tube 12, the outer sealing tube 13, and the outer pressure tube 14, is wrapped around the surrounding rock. The hollow steel stranded wire 5 is driven by an external force, and the resin fixing agent inserted into the bottom of the drilling hole 11 in the surrounding rock is hardened to the designed strength. Stir until reached.

After the hollow steel stranded wire 5 is fixed to the bottom of the excavation hole 11 in the surrounding rock by a resin fixing agent, the grout stopper 10 is first inserted into the hollow steel stranded wire 5, and then the pallet 3 is fixed. It was inserted from the small end of the resistance device 6, abutted against and locked with the large end of the constant resistance device 6, and then the seal ring 7 of the bottom hole of the constant resistance device and the I-shaped push tube 8 were attached to the bottom. A constant resistance device 6 is inserted into the hollow steel stranded wire 5 and sent to a diameter expanding drilling hole 9, and finally a clip-type anchor 2 is attached to the end of the hollow steel stranded wire 5.

The clip-type anchor 2 is pushed into the end of the constant resistance device 6, and a preload force is applied to the hollow steel stranded wire 5 using a jack tensioning device, and the jack supports the clip-type anchor 2 and pulls the hollow steel stranded wire 5. After reaching the designed preload force, the clip-type anchor 2 fixes the hollow stranded steel wire 5 using the tapered hole wedging principle.

After the hollow steel stranded wire 5 reaches the design preload force, the jack tensioning device can be removed, and then the grouting device with a grouting check valve and the hollow hexagon at the end of the hollow steel stranded wire 5 The grout passes through the hollow hexagonal nut 1, the grout steel pipe 16, the nylon grout pipe 20, the grout outlet 17, and the grout discharge gap 21, and finally excavates in the surrounding rock. Flowing into the hole 11, by reverse grout injection, the grout starts to enter the gap in the surrounding rock from the hole bottom of the excavation hole 11 in the surrounding rock, and when the grout hardens, it fixes the grout to the surrounding rock of the fracture. completed.

Note that the hollow steel stranded wire 5 is a factory preform, and the internal grout injection steel tube 16, inner sealing tube 15, wrap tube 19, nylon tube 20 for grout injection, and hollow hexagonal nut 1 are all , a precast buried installation is carried out, and the hollow hexagonal nut 1 at the end of the hollow steel stranded wire 5 is equipped with a plug, which needs to be twisted during grouting.

Furthermore, before the constant resistance device 6 is sent to the diameter enlargement excavation hole 9, it is necessary to install the seal ring 7 of the bottom hole of the constant resistance device and the I-shaped push tube 8 in advance.

In order to avoid grout leakage and grout intrusion into the constant resistance device 6 during grouting, the present invention adopts two grout leakage prevention measures.

The first measure is the jacket tube 12, the outer sealing tube 13, the outer pressing tube 14, the inner sealing tube 15, which on the one hand forms a grout barrier between the jacket tube 12 and the hollow steel stranded wire 5, and on the other hand , a grout barrier is formed between the inner wall of the hollow steel stranded wire 5 and the grout injection steel pipe 16, and the first grout barrier in the deep part of the excavation hole 11 in the surrounding rock is completed by the combination type.

The second measure is a sealing ring 7 for the bottom hole of the constant resistance device, an I-shaped push tube 8, and a grout stopper 10, which can be combined to seal the borehole 11 and the diameter expansion borehole 9 in the surrounding rock. Then, sealing of the bottom of the diameter-expanding drill hole 9 and the constant resistance device 6 is completed. With the above two measures to prevent leakage of grout liquid, the grout liquid at the bottom of the excavated hole 11 in the surrounding rock cannot flow back between the mantle tube 12 and the hollow steel stranded wire 5, and the grout liquid is inside the constant resistance device 6, while leaving a free-extending segment at one end where the hollow steel strand 5 does not come into direct contact with the grouting liquid, thereby allowing the NPR anchor cable to maintain its large Easily exhibits transformation ability. On the other hand, it is ensured that the constant resistance body 4 has a slip space within the constant resistance device 6. Through the above two grout barrier measures, the grouting pressure can be maximized and the grouting fixing effect can be greatly improved.

In short, in the technical solution of the NPR anchor cable for grouting provided by the present invention, a grouting pipe and a plurality of steel strands are combined to form an anchor cable body, which has a grouting core pipe, and can be used on-site. There is no need to bundle the grout injection pipe and the exhaust pipe, and counter pressure grout injection is used to reduce the probability of cavitation cavitation. At the same time, the grouted nylon pipe is used in conjunction with the grouted steel pipe and the grout stopper is arranged to improve the sealing effect and significantly improve the grouting efficiency. Also, by providing two seal assemblies, grouting can be effectively prevented. It also maximizes the grout injection pressure and greatly improves the grout injection fixing effect.

1 Hollow hexagonal nut 2 Anchor 3 Pallet 4 Constant resistance element 5 Stranded steel wire 6 Constant resistance sleeve 7 Seal ring 8 I-shaped push tube 9 Diameter expansion drilling hole 10 Grout stopper 11 Drilling hole in surrounding rock 12 Mantle Pipe 13 Outer sealed tube 14 Outer pressure tube 15 Inner sealed tube 16 Grout injection tube 17 Grout discharge port 18 Fixed segment 19 Wrap tube 20 Nylon tube 21 Gap for grout discharge

Claims (7)

an anchor cable body, wherein the end of the anchor cable body is provided with a fixing segment that is used for fixing to the bottom of a borehole;
A constant resistance device including a constant resistance body and a constant resistance sleeve, wherein the constant resistance body is fitted around the outer periphery of the anchor cable body, the constant resistance sleeve is fitted around the outer periphery of the constant resistance body, and the constant resistance body is fitted around the outer periphery of the anchor cable body, a constant resistance device, wherein the resistor is used to move with a constant resistance along the axial direction of the anchor cable in the constant resistance sleeve;
A constant resistance device seal assembly provided at an end of a constant resistance device, the constant resistance device seal assembly being used to close a gap between an anchor cable body and a wellbore, and the constant resistance device being connected to the constant resistance device. a constant resistance device seal assembly pressing against the resistance device seal assembly;
A fixed assembly including a pallet and an anchor, both of which are provided at one end with an anchor cable body protruding from a borehole in the surrounding rock, wherein the anchor cable body tension is within a design preload force. with a fixing assembly used to fix and lock the anchor cable body after reaching the
An NPR anchor cable for grouting comprising:
The constant resistance device seal assembly includes:
a seal ring that is fitted around the outer periphery of the anchor cable body and the bottom of the constant resistance sleeve, and is used to seal the bottom of the constant resistance sleeve;
a grout stopper provided between the anchor cable body and the excavation hole and used to close the gap and increase the pressure of grout injection;
A pressing member provided between the seal ring and the grout stopper and used to transmit the pressing force of the constant resistance device to the grout stopper, the pressing member being an I-shaped push tube. , the I-shaped push tube has a push member fitted onto the anchor cable body;
including;
A cross-sectional shape of the I-shaped push tube near one end of the constant resistance device is the same as the seal ring, and a cross-sectional shape of the I-shaped push tube near one end of the grout stopper is the same as the grout stopper. , a flange rim is provided at the end of the constant resistance sleeve, the pallet is fitted around the outer periphery of the constant resistance sleeve, and is pressed against the surrounding rock by the flange rim of the constant resistance sleeve;
The anchor is a clip-type anchor, and the clip-type anchor is fitted around the outer periphery of the anchor cable body and comes into contact with the constant resistance body.
NPR anchor cable for grout injection. The anchor cable body includes a plurality of steel strands and a grouting tube, the plurality of steel strands are wound around the outer circumference of the grouting tube, the length of the steel strands is greater than the length of the grouting tube, and the anchor At one end protruding from the borehole of the cable body, the steel strands are aligned with the grout injection tube;
The NPR anchor cable for grouting according to claim 1. A plastic pipe is connected to one end of the grout injection pipe protruding into the excavation hole, and a wrap pipe is fitted around the outer periphery of the grout injection pipe and the plastic pipe,
The anchor cable body between the plastic tube and the fixed segment is a grout outlet, and the grout outlet is located in the grout outlet gap between any adjacent steel strands after the anchor cable body is expanded. It is formed from
The NPR anchor cable for grouting according to claim 1. A mantle tube is fitted over the anchor cable body, and one end of the mantle tube is located within the constant resistance sleeve and the other end is located in front of the wrap tube.
The NPR anchor cable for grouting according to claim 3. The grouting NPR anchor cable further includes an anchor cable seal assembly, the anchor cable seal assembly being disposed at one end of the mantle tube proximate to the wrap tube.
The NPR anchor cable for grouting according to claim 4. The anchor cable assembly includes:
an inner sealing tube located between the steel strands and the grout injection tube and corresponding to one end of the mantle tube near the grout outlet;
an outer sealing tube disposed around the outer circumference of a steel strand, the outer sealing tube and the mantle tube including an outer sealing tube having a lap segment;
The NPR anchor cable for grouting according to claim 5. The anchor cable assembly further includes an outer pusher tube, the outer pusher tube being fitted around the outer circumference of the outer sealing tube to close a gap between the outer sealing tube and a borehole in surrounding rock. , filled between the outer sealing tube and the borehole inner wall with surrounding rock,
The NPR anchor cable for grouting according to claim 6.

Images