CN210264776U

CN210264776U - Self-sealing type anchor cable for sectional grouting

Info

Publication number: CN210264776U
Application number: CN201920421034.6U
Authority: CN
Inventors: 付建辉; 时耀坤
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-30
Filing date: 2019-03-30
Publication date: 2020-04-07
Anticipated expiration: 2029-03-30

Abstract

The utility model provides a self-sealing type sectional grouting anchor cable for solving the problem that the existing hollow grouting anchor cable can not perform sectional grouting, which is characterized in that a grouting core pipe is a soft plastic grouting pipe, a plurality of grout outlet holes are processed on the corresponding section number positions of the soft plastic grouting pipe, a support sleeve is installed, grout outlet gaps are formed between steel stranded wires, so that a part of the grout outlet gaps are sleeved by self-sealing grout stop plugs, and the rest grout outlet gaps are exposed; grout can be full of the cavity of self sealss grout stop plug one by one at first, makes its rapid inflation under grouting pressure, seals the pore wall clearance at every slip casting section both ends, forms a plurality of slip casting sections naturally, and the even diffusion of grout meeting is injected into the surrounding rock crack.

Description

Self-sealing type anchor cable for sectional grouting

Technical Field

The utility model relates to a geotechnical engineering struts the technique, especially relates to mining slip casting anchor rope.

Background

At present, along with the increase of coal mining depth, the difficulty of roadway support and repair in the coal mining production process is also increased continuously, and grouting becomes an effective means and method for solving the problem of support at present. The grouting mode is divided into common grouting and sectional grouting. The common grouting is to install a grouting pipe from an orifice and perform grouting inwards, the process is simple, but the diffusion range of the grout is not uniform, especially for the heterogeneous stratum; the sectional grouting can achieve the grouting effect with uniform diffusion range, and has more remarkable advantages compared with the common grouting. The existing sectional grouting method mainly comprises two grouting methods, namely a drill rod retreating type grouting method and a sleeve valve pipe retreating type grouting method. The drill rod retreating type grouting method adopts a drill rod to form a hole at one time, the drill rod is directly used as a grouting pipe, retreating of the drill rod is utilized to realize retreating type sectional grouting, but the grouting method is lack of effective isolation measures among different grouting sections, so that grouting controllability is limited, and all grout cannot be guaranteed to enter a target grouting section; in order to overcome the defect of a drill rod retreating type, some sleeve valve pipe retreating type grouting pipes are adopted, the sleeve valve pipe retreating type grouting pipe mainly comprises a grouting outer pipe and a grouting core pipe, grouting stop plugs are arranged at two ends of the grouting core pipe, segmentation is realized by utilizing the movement of an inner core pipe, and grout enters a injected medium between the two grouting stop plugs; because sleeve valve pipe formula slip casting structure and construction procedure of retreating are comparatively complicated, easily take place the condition such as component damage in the slip casting work progress on a large scale, reduce slip casting efficiency. CN109098687 discloses a single grout stop plug retreat type sectional grouting device and method for fractured rock mass, wherein the device comprises an inner pipe, an outer pipe, a water injection pipe, an expansion type grout stop plug, an inner pipe valve, an outer pipe valve, a water injection pipe valve, an inner pipe check valve and an outer pipe check valve; the expansion type grout stopping plug is communicated with the expansion type grout stopping plug through the outer pipe and fixed on the outer pipe, the water injection pipe is communicated with the inside of the expansion type grout stopping plug, water can be injected into the expansion type grout stopping plug through the water injection pipe to enable the expansion type grout stopping plug to expand, the water injection pressure of the expansion type grout stopping plug is higher than the designed grouting pressure, the expansion type grout stopping plug can bear the pressure applied by grout under the designed grouting pressure, and the purpose of sealing the segmented plugged holes is achieved. The manual water injection sectional sealing mode has the advantages of complex operation, low construction speed and low efficiency, and is not easy to popularize and use.

In addition, grouting anchor cables are adopted for roadways with poor surrounding rock integrity at present. The grouting anchor cable is characterized in that an anchor cable body is installed in an anchor hole, high-pressure grouting is conducted in the anchor hole, grout enters a surrounding rock gap through the anchor hole, and broken surrounding rock is cemented into a whole. The grouting anchor cable plays the dual role of grouting and anchor cable anchoring. The current more advanced grouting anchor cable is a hollow grouting anchor cable. The hollow grouting anchor cable is a cable body formed by spirally winding a plurality of steel strands on a grouting core pipe, and high-pressure grouting is performed to an anchor hole through the grouting core pipe. The grouting plug is adopted to plug the grout at the orifice when the existing hollow grouting anchor cable is grouted, the grout flows back from inside to outside after coming out from the front end of the grouting core pipe and is injected into a surrounding rock crack, and the grouting anchor cable is similar to common grouting, so that the defect of uneven grout diffusion range exists. The existing grouting anchor cable structure cannot be used for sectional grouting, and the advantages of the existing grouting anchor cable structure cannot be fully exerted.

Disclosure of Invention

In order to solve the problem that current cavity slip casting anchor rope can not the segmentation slip casting, the utility model provides a self-sealing formula segmentation slip casting anchor rope.

The technical scheme is that the self-sealing type segmented grouting anchor cable comprises a hollow grouting anchor cable, wherein a plurality of steel strands are spirally wound on a grouting core pipe to form a cable body; the grouting anchor is characterized in that an anchoring head is arranged at the front end of the cable body and used for anchoring the cable body at the bottom of the grouting anchor hole; the rear end of the cable body is welded with a high-strength steel pipe and is provided with a lock, and the cable body can be locked by the lock after applying pretightening force outside the hole; the grouting core pipe of the hollow grouting anchor cable is a soft plastic grouting pipe, the soft plastic grouting pipe is tightly connected with the high-strength steel pipe, the outer end head of the high-strength steel pipe is provided with an external thread and a hollow hexagon nut, and the high-strength steel pipe can be quickly connected with the grout conveying pipe joint through the hollow hexagon nut; according to the designed number of grouting sections, a plurality of grout outlet holes are processed at the sectional positions of the grouting core pipes, a support sleeve is arranged between the steel stranded wires at the positions of the grout outlet holes and the grouting core pipes, a cable body is expanded at the position to form an expansion joint through the support sleeve, the steel stranded wires of the expansion joint are expanded to form a grout outlet gap, a self-sealing grout stop plug is sleeved at the rear part of the expansion joint, the self-sealing grout stop plug is sleeved at the rear part of the grout outlet gap, and the front part of the grout outlet gap is exposed; during grouting, the self-sealing grout stop plug can be filled with grout to expand, hole wall gaps at two ends of each grouting section are blocked, and a grouting anchor hole is naturally divided into a plurality of grouting sections, so that the grout is uniformly diffused into surrounding rock cracks.

The self-sealing grout stop plug is an elastic tube with an ellipsoidal shape, the maximum outer diameter of the elastic tube is smaller than the diameter of a grouting anchor hole so as to be smoothly pushed into the grouting anchor hole, the inner diameter of the elastic tube is smaller than the diameter of a cable body and is tightly sleeved on the cable body by means of self elasticity, and the middle part of a tube cavity of the elastic tube is an ellipsoidal cavity.

Furthermore, in order to prevent the self-sealing grout stop plug from sliding in a dislocation way in the installation process of the self-sealing grout stop plug into the grouting hole, a positioning ring is fixed at the rear part of the expansion joint of the cable body.

Furthermore, in order to enable the cable body to have a yielding effect in surrounding rock deformation, the hollow grouting anchor cable is provided with a high-strength spherical tray outside the hole.

The utility model has the advantages that after entering the grouting core pipe, the grout flows out from the expansion joint, and because part of the expansion joint is sleeved by the self-sealing grout stop plug, the grout can be filled with the cavity of the self-sealing grout stop plug one by one, and the grout can rapidly expand under the grouting pressure to seal the hole wall gaps at the two ends of each grouting section, so that the grouting sections are naturally formed, and the grout can be uniformly diffused and injected into surrounding rock cracks; the self-sealing grout stopping plug is ellipsoidal, so that the grout stopping plug has a certain length, and the middle part of the grout stopping plug is an ellipsoidal cavity and has a larger contraction space; the middle wall is thin, large deformation is generated in the radial direction under the pressure of slurry, the gap is tightly blocked, the self-sealing piece is guaranteed not to be reduced in the slurry consolidation process, slurry leakage is avoided, the problem that the size between the drilling hole and the slurry stopping plug is difficult to match is solved, the effects of sealing and stopping slurry are achieved, the adaptability of the slurry stopping plug to drilling holes with different lithologies is improved, and the purpose of natural sectional grouting is achieved.

Drawings

FIG. 1 is a schematic illustration of an embodiment; FIG. 2 is an enlarged fragmentary view of FIG. 1 showing the expansion joint more clearly in a self-sealing condition; FIG. 3 is a view of the construction of a self-sealing grout stop plug.

The legend shows that 1-hollow hexagonal nut, 2-high-strength steel pipe, 3-lock, 4-high-strength spherical tray, 5-positioning ring, 6-support sleeve, 7-self-sealing grout stop plug, 8-grouting core pipe, 9-grout outlet, 10-grouting anchor hole, 11-surrounding rock, 12-steel strand, 13-anchor head, 14-clip, 15-grout outlet gap and 16-ellipsoidal cavity.

Detailed Description

As shown in fig. 1, the self-sealing type segmented grouting anchor cable comprises a hollow grouting anchor cable, wherein a plurality of steel strands 12 are spirally wound on a grouting core pipe 8 to form a cable body; wherein, the front end of the cable body is provided with an anchoring head 13, and the anchoring head 13 is used for anchoring the cable body at the bottom of the grouting anchor hole 10; the rear end of the cable body is welded with a high-strength steel pipe 2 and is provided with a lockset 3, and the lockset 3 can be used for locking after pretightening force is applied outside the hole; the grouting core pipe 8 of the hollow grouting anchor cable is a soft plastic grouting pipe, and the soft plastic grouting pipe is tightly connected with the high-strength steel pipe 2 and is clamped by a clamp 14; the outer end of the high-strength steel pipe 2 is provided with an external thread and a hollow hexagonal nut 1, and the high-strength steel pipe can be quickly connected with a slurry conveying pipe joint through the hollow hexagonal nut 1; referring to fig. 2, according to the designed number of grouting sections, a plurality of grout outlet holes 9 are processed at the sectional positions of a grouting core pipe 8, a support sleeve 6 is installed between a steel strand 12 at the position of the grout outlet hole 9 and the grouting core pipe 8, a rope body is stretched at the position through the support sleeve 6 to form an expansion joint, a grout outlet gap 15 is formed by stretching the steel strand 12 of the expansion joint, self-sealing grout stopping 7 is sleeved at the rear part of the expansion joint, and the rear part of the grout outlet gap 15 is sleeved with the self-sealing grout stopping plug 7, so that the front part of the grout outlet gap 15 is exposed; during grouting, the self-sealing grout stop plugs 7 can be filled with grout to expand, hole wall gaps at two ends of each grouting section are blocked, the grouting anchor holes 10 are naturally divided into a plurality of grouting sections, and the grout is uniformly diffused into cracks of the surrounding rock 11.

As shown in figure 3, the self-sealing grout stop plug 7 is an elastic tube which is in an ellipsoidal shape, the maximum outer diameter of the elastic tube is smaller than the diameter of the grouting anchor hole 10 so as to be smoothly pushed into the grouting anchor hole, the inner diameter of the elastic tube is smaller than the diameter of a cable body, the elastic tube is tightly sleeved on the cable body by means of self elasticity, and the middle part of a tube cavity of the elastic tube is an ellipsoidal cavity 16.

Furthermore, in order to prevent the self-sealing grout stop plug 7 from sliding in a dislocation way during the installation process to the grouting anchor hole 10, a positioning ring 5 is fixed on the rear part of the expansion joint of the cable body.

Furthermore, in order to enable the cable body to have a yielding effect in surrounding rock deformation, the hollow grouting anchor cable is provided with a high-strength spherical tray 4 outside the hole.

Claims

1. A self-sealing type segmented grouting anchor cable comprises a hollow grouting anchor cable, wherein a plurality of steel strands are spirally wound on a grouting core pipe to form a cable body; the grouting anchor is characterized in that an anchoring head is arranged at the front end of the cable body and used for anchoring the cable body at the bottom of the grouting anchor hole; the rear end of the cable body is welded with a high-strength steel pipe and is provided with a lock, and the cable body can be locked by the lock after applying pretightening force outside the hole; the grouting core pipe of the hollow grouting anchor cable is a soft plastic grouting pipe, the soft plastic grouting pipe is tightly connected with the high-strength steel pipe, the outer end head of the high-strength steel pipe is provided with an external thread and a hollow hexagon nut, and the high-strength steel pipe can be quickly connected with the grout conveying pipe joint through the hollow hexagon nut; according to the designed number of grouting sections, a plurality of grout outlet holes are processed at the sectional positions of the grouting core pipes, a support sleeve is arranged between the steel stranded wires at the positions of the grout outlet holes and the grouting core pipes, a cable body is expanded at the position to form an expansion joint through the support sleeve, the steel stranded wires of the expansion joint are expanded to form a grout outlet gap, a self-sealing grout stop plug is sleeved at the rear part of the expansion joint, the self-sealing grout stop plug is sleeved at the rear part of the grout outlet gap, and the front part of the grout outlet gap is exposed; during grouting, the self-sealing grout stop plugs are filled with grout to expand, so that hole wall gaps at two ends of each grouting section are blocked, and the grouting anchor hole is naturally divided into a plurality of grouting sections; the self-sealing grout stop plug is an elastic pipe with an ellipsoidal appearance, the maximum outer diameter of the elastic pipe is smaller than the diameter of a grouting anchor hole, the inner diameter of the elastic pipe is smaller than the diameter of a cable body, the elastic pipe is tightly sleeved on the cable body by means of elasticity of the elastic pipe, and the middle part of a pipe cavity of the elastic pipe is an ellipsoidal cavity.

2. A self-sealing segmental grouting anchor rope according to claim 1, characterised in that a retaining ring (5) is fixed to the rear part of the expansion joint of the rope body.

3. A self-sealing segmented grouting anchor cable according to claim 1, characterised in that the hollow grouting anchor cable is provided with a high-strength spherical tray (4) outside the bore.

4. The self-sealing type segmental grouting anchor cable as claimed in claim 1, wherein the high-strength steel pipe (2) is tightly connected with the soft plastic grouting pipe (8) and then clamped by a clamp (14).