CN114607429A - A grouting anchor cable with both pressure control and pressure yielding functions - Google Patents

Abstract

The invention relates to the technical field of grouting anchor cables in underground engineering, in particular to a grouting anchor cable with pressure control and pressure yielding functions. A plurality of grouting outlets; a plurality of steel strands are wound on the outside of the grouting pipe; a tray is sleeved on the main body of the grouting anchor cable, and the tray is in contact with the outer surface of the surrounding rock of the roadway; The hole of the hole; the lock, which cooperates with the lock cylinder and is used to lock the tray and the main body of the grouting anchor cable; the nut, which forms the cable body fastening device with the grouting plug and the tray; the pressure control piston is connected with the spring; Cement medicine roll baffle; high-strength pressure spring, fixed on the neutral rod. Using this scheme, the distributed and graded grouting of surrounding rock can be realized by flexibly controlling the grouting pressure, and when the surrounding rock is subjected to a large mining stress, the compression spring in the main rod body will be squeezed and deformed in time, and the anchor The cable can still provide supporting force to the surrounding rock to achieve neutral resistance.

Description

A grouting anchor cable with both pressure control and pressure yielding functions

technical field

The invention relates to the technical field of grouting anchor cables in underground engineering, in particular to a grouting anchor cable with pressure control and pressure yielding functions.

Background technique

The problem of soft rock roadway support in the mining field has always been a major problem in this field, especially the roadway support with weak and broken surrounding rock is very difficult, and the conventional support method cannot effectively control the formation of the roadway surrounding rock.

Now the hollow grouting anchor cable has the advantages of high strength, large prestress, simple processing and convenient installation, etc., and has been widely used in the support and reinforcement of coal mine roadways. However, when the surrounding rock is relatively broken and strong rheology occurs in the deep, the deformation of the surrounding rock of the roadway is large, and it is difficult to meet the requirements of coal mine production. It is urgent to improve the current anchor cable.

CN110513132A discloses a pressure-sensitive grouting anchor cable and a step-by-step grouting construction method. The pressure-sensitive grouting anchor cable is provided with a pressure sensing valve between the grouting anchor cable bodies; CN112392524A discloses a geotechnical engineering The segmented hollow grouting anchor cable device is provided with a constant pressure sealing sleeve and a segment isolator on the grouting inner pipe or the hollow grouting pipe.

However, the above two grouting anchor cables have the following problems: (1) The grouting pressure is segmented, but the segment is relatively fixed, the pressure cannot be flexibly adjusted, and the pressure is not easy to control and adjust. (2) The grouting anchor cable does not have the pressure-yielding function, and it is difficult to adapt to the roadway support under the strong mining pressure and the large deformation and strong rheology of the surrounding rock.

SUMMARY OF THE INVENTION

The purpose of the patent of the present invention is to overcome the deficiencies of the prior art, and to provide a grouting anchor cable with both pressure control and pressure yielding functions with good supporting effect and flexible and convenient grouting.

In order to achieve the above purpose, the present invention provides a grouting anchor cable with both pressure control and pressure yielding functions, which includes:

The main body 1 of the grouting anchor cable is provided with a grouting pipe 8 inside, and a plurality of grouting outlets are arranged on the grouting pipe 8; the outer side of the grouting pipe 8 is wound with a plurality of steel strands 7; the tray 5 is sleeved on the grouting anchor On the main body 1 of the cable, and the tray 5 is in contact with the outer surface of the surrounding rock of the roadway; the stopper 6 is used to block the hole of the drilled hole; The main body 1 of the cable is locked; the nut 2, the stopper 6 and the tray 5 form a cable body fastening device; the pressure control piston 9 is connected to the spring 10; the cement roll baffle 11; on the sex rod 12.

In particular, the grouting pipe is connected to the external grouting pump through a pipeline. When the slurry enters the grouting pipe through the grouting pump, a certain pressure is applied to the pressure control piston, the compression spring is deformed, and the pressure control piston is pushed to the tail of the anchor cable. The grout in the grouting pipe flows out through the orifice on the grouting pipe wall to complete the grouting reinforcement of the shallow surrounding rock; when the grouting pressure is increased, the grout pushes the pressure-controlled piston to move, and the pressure-controlled piston compression spring is further deformed. The grout continued to move forward to reinforce the deep surrounding rock by grouting.

In particular, the distance between the plurality of grouting outlets provided on the grouting pipe is 0.5m.

In particular, a plurality of steel strands are evenly and tightly surrounded around the grouting pipe in a spiral shape.

In particular, two ends of the main body of the grouting anchor cable are respectively provided with threads and threaded connection nuts, and a plurality of grouting anchor cables can be connected together through the threads and the threaded connection nuts.

Compared with the prior art, the present invention has the following advantages: when the slurry enters the grouting pipe with the pressure provided by the grouting pump, a certain pressure is applied to the pressure control piston by using the principle of spring compression deformation, and the pressure compresses the deformation of the spring and pushes the pressure control piston It moves to the tail of the anchor cable, and the grout in the grouting pipe flows out through the orifice on the grouting pipe wall to complete the grouting reinforcement of the shallow surrounding rock; when the grouting pressure is increased, the grout pushes the piston to move, and the pressure-controlled piston The compression spring is further deformed, the grout continues to move forward, and the deep surrounding rock is grouted for reinforcement, so that the distributed and graded grouting of the surrounding rock can be realized by flexibly controlling the grouting pressure. When the surrounding rock is subjected to large mining stress, the compression spring in the main rod body will be squeezed and deformed in time, and the anchor cable can still provide supporting force to the surrounding rock to achieve moderate resistance.

Other advantages, objects, and features of the present invention will be set forth in the description that follows, and will be apparent to those skilled in the art based on a study of the following, to the extent that is taught in the practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the following description.

Description of drawings

Fig. 1 is the structural representation of the present invention;

FIG. 2 is a schematic view of the cross-sectional structure of the cross-section A-A in FIG. 1 of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be more clearly defined.

Referring to Figures 1 and 2, a grouting anchor cable with both pressure control and pressure yielding functions includes:

The main body 1 of the grouting anchor cable is provided with a grouting pipe 8 inside;

The outer side of the grouting pipe 8 is the steel strand 7;

nut 2;

Slurry stopper 6, plugged in the hole of the drilled hole;

The tray 5 is sleeved on the main body 1 of the grouting anchor cable, and the tray 5 abuts on the outer surface of the surrounding rock of the roadway;

The lock 4 is matched with the lock cylinder 3, and the lock 4 and the lock cylinder 3 are used to lock the tray 5 and the grouting anchor cable main body 1 tightly;

The pressure control piston 9 is connected with the spring 10;

Cement medicine roll baffle 11;

The high-strength compression spring 13 is fixed on the neutral rod 12 .

A grouting anchor cable with controllable pressure and pressure yielding function, the main body of the anchor cable is a grouting pipe, a plurality of grouting outlets are arranged on the grouting pipe, and the distance between the multiple grouting outlets is 0.5m; There are many steel strands wound around the outer periphery of the grouting pipe, and the steel strands are evenly and tightly wrapped around the grouting pipe in a spiral shape; the grouting pipe is equipped with a pressure-controlled piston, which is connected to a spring; the grouting pipe is connected to the grouting pipe through the pipe. The pump is connected to each other. When the slurry enters the grouting pipe with the pressure provided by the grouting pump, a certain pressure is applied to the pressure control piston by using the principle of spring compression and deformation. The grout in the grouting pipe flows out through the orifice on the grouting pipe wall to complete the grouting reinforcement of the shallow surrounding rock; when the grouting pressure is increased, the grout pushes the pressure-controlled piston to move, and the pressure-controlled piston compression spring is further deformed. The grout continues to move forward to reinforce the deep surrounding rock by grouting, so that the distributed and graded grouting of the surrounding rock can be realized by flexibly controlling the grouting pressure. When the surrounding rock is subjected to a large mining stress, the compression spring in the main rod body will be squeezed and deformed in time, and the anchor cable can still provide a supporting force to the surrounding rock, so as not to be broken and fail.

Two ends of the main body of the anchor cable are respectively provided with threads and threaded connection nuts, and a plurality of grouting anchor cables can be connected together through the threads and the threaded connection nuts.

The invention discloses a grouting anchor cable with a controllable pressure-yielding function and flexible grouting method, which can realize low-pressure or high-pressure grouting. Different slurries can be injected into different areas in a targeted manner, which ensures the grouting effect. The waste of slurry is reduced, thereby improving the supporting effect of broken surrounding rock such as soft rock roadways.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (5)

1. The utility model provides a have accuse pressure concurrently and let slip casting anchor rope of pressure function which characterized in that, it includes:

the grouting anchor cable main body is internally provided with a grouting pipe, and the grouting pipe is provided with a plurality of grout outlets; a plurality of steel strands are wound outside the grouting pipe; the tray is sleeved on the grouting anchor cable main body and abuts against the outer surface of the roadway surrounding rock; the grout stopping plug is used for plugging the orifice of the drilled hole; the lock is matched with the lock core and used for locking the tray and the grouting anchor cable main body; the nut, the grout stopping plug and the tray form a cable body fastening device; the pressure control piston is connected with the spring; a cement medicated roll baffle; the high-strength yielding spring is fixed on the neutral rod.

2. The grouting anchor cable with the pressure control and yielding functions as claimed in claim 1, wherein the grouting pipe is connected with an external grouting pump through a pipeline, when slurry enters the grouting pipe through the grouting pump, a certain pressure is applied to the pressure control piston, the compression spring deforms, the pressure control piston is pushed to move towards the tail part of the anchor cable, and at the moment, the slurry in the grouting pipe flows out through an orifice on the wall of the grouting pipe, so that grouting reinforcement on shallow surrounding rock is completed; when the grouting pressure is increased, the grout pushes the pressure control piston to move, the pressure control piston compression spring further deforms, the grout continuously moves forwards, and grouting reinforcement is carried out on the deep surrounding rock.

3. The grouting anchor cable with both pressure control and yielding functions as claimed in claim 1 or 2, wherein the grouting pipe is provided with a plurality of grout outlets spaced at a distance of 0.5 m.

4. The grouting anchor cable with both pressure control and yielding functions as claimed in claim 1 or 2, wherein the steel strands are uniformly and tightly wound around the grouting pipe in a spiral shape.

5. The grouting anchor cable with both pressure control and yielding functions as claimed in claim 1 or 2, wherein the grouting anchor cable body is provided with threads and threaded connection nuts at two ends respectively, and a plurality of grouting anchor cables can be connected together through the threads and the threaded connection nuts.

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