CN201206470Y - Yield press anchor cable - Google Patents

Abstract

A yielding anchor cable is suitable for yielding in mines, tunnels and underground engineering support. It consists of an anchor cable body, a tray on the anchor cable body, an anchor cable lock that fixes the tail of the anchor cable body, and a pressure relief device between the anchor cable body and the anchor cable lock. The head is provided with an anchoring agent stirring head. When the roadway is excavated and the bolt support is carried out simultaneously, it has the effect of coordinating the low elongation rate of the anchor cable and the mismatch of the deformation of the anchor rod in the joint support of the anchor rod and the anchor cable, so that the anchor rod and the anchor cable can play their respective bearing roles at the same time, and the roadway One-time molding speeds up the construction of the roadway and reduces the support cost. The anchor cable can avoid being broken when the roadway has a large deformation. roadway stability. The utility model has the advantages of simple structure, convenient construction, good supporting effect and wide practicability.

Description

a pressure anchor

technical field

The utility model relates to an anchor cable, in particular to a yield anchor cable used for supporting mines, tunnels and underground engineering.

Background technique

The geological conditions of my country's coal mines are relatively complex. With the increase of mine mining intensity and mining depth, the proportion of roadways suitable for ordinary bolt support is getting smaller and smaller, while the roadways of types IV and V with poor roadway stability The proportion is increasing, especially in roadways affected by deep rockburst, and the proportion of thick coal seam dynamic pressure roadways, soft rock roadways and composite roof roadways for top-coal caving mining has increased most obviously. The stability of these roadways cannot be maintained simply by using ordinary anchor bolts, and anchor cables must be used for reinforcement. At present, the joint support of bolt and anchor cable is used in coal mine roadway, which is becoming more and more common. In the joint support of anchor rod and anchor cable, there is a problem of coordination. The coordinated joint support can not only maximize the respective support performance of the anchor rod and anchor cable, but also achieve the maximum support effect through mutual coordination and combination according to their respective support characteristics.

As a reinforcement technology, small-diameter prestressed anchor cables have been widely used in coal mine bolt support. Its function is to connect the secondary bearing layer formed by bolt support with the key layer of the surrounding rock, fully mobilize the bearing capacity of the deep surrounding rock, make a wider range of rock mass bear the load together, and improve the stability of the support system. The small-diameter prestressed anchor cable uses the 1×7 standard steel strand in the national standard "Steel Strand for Prestressed Concrete" (GB/T5224-1995). This steel strand has high damage resistance, good toughness, and low The characteristics of relaxation, both rigidity and flexibility, can be bent and realize the rapid installation of self-stirring resin rolls, suitable for use in coal roadways with small space dimensions. From the engineering characteristics of the small-diameter anchor cables (15.24mm and 17.8mm) widely used in coal mines, the elongation of the steel strand is only 3.5%, while the engineering elongation of the anchor cable is 1.8%, while the elongation of the anchor rod is only 3.5%. Generally between 20% and 25%. Based on the combined support system of 6m anchor cable and 2m anchor rod commonly used in engineering, the maximum extension of the anchor cable is 108mm, while the maximum extension of the anchor rod is 400mm. It can be seen that the deformation resistance between the two is different. Larger, so the load of the anchor rod and the anchor cable is not synchronized, and it is easy to cause the anchor rod to start to play a bearing role after the anchor cable is pulled off first.

Contents of the invention

The purpose of the utility model is to overcome the problems existing in the prior art, and provide a simple structure, convenient construction, and good support effect to give way to the anchor cable.

The yielding anchor cable of the utility model includes an anchor cable body, a tray arranged on the anchor cable body, and an anchor cable lock for fixing the tail of the anchor cable body, and a pressure relief device is arranged between the tray and the anchor cable lock. , the head of the anchor cable body is provided with an anchoring agent stirring head.

The pressure relief device is composed of a pressure relief pipe with a protrusion in the middle, which can provide a deformation space of 50-100 mm, and washers arranged at both ends of the pressure relief pipe.

The utility model fully considers the pressure relief principle of the roadway and the deformation characteristics of the bolt support, adopts a hollow pressure relief tube, and adds an anchoring agent stirring head at the end of the anchor cable, so that the anchoring agent can be fully stirred to enhance the anchoring effect. When the roadway is excavated and the bolt support is carried out simultaneously, it has the effect of coordinating the low elongation rate of the anchor cable and the mismatch of the deformation of the anchor rod in the joint support of the anchor rod and the anchor cable, so that the anchor rod and the anchor cable can play their respective bearing roles at the same time, and the roadway One-time molding speeds up the construction of the roadway and reduces the support cost. The anchor cable can avoid being broken when the roadway has a large deformation. roadway stability. The utility model has the advantages of simple structure, convenient construction, good supporting effect and wide practicability.

Description of drawings

Fig. 1 is a structural diagram of the utility model;

Fig. 2 is the A-A view of Fig. 1 .

In the figure: 1 - anchor cable lock; 2 - washer; 3 - yield pipe; 4 - tray; 5 - anchor cable body; 6 - anchoring agent stirring head; 7 - steel strand.

Detailed ways

An embodiment of the present utility model is further described below in conjunction with accompanying drawing:

As shown in FIG. 1 , the pressure anchor cable is composed of an anchor cable lock 1 , a pressure relief device, a tray 4 , an anchor cable body 5 and an anchoring agent stirring head 6 . The anchor cable body 5 is made of seven steel strands, as shown in FIG. 2 . The pressure relief device is composed of a pressure relief pipe 3 with a protrusion in the middle, which can provide a deformation space of 50-100 mm, and washers 2 arranged at both ends of the pressure relief pipe 3 . Anchor agent stirring head 6 is located at the head of anchor cable body 5, and pressure device and tray 4 are worn on anchor cable body 5, fixed by anchor cable lock 1, and anchor cable lock 1 is made of washer and nut.

Working principle: When the roadway is initially excavated, the surrounding rock is disturbed, which breaks the original balance of the stress of the original rock. Stress concentration will occur in some areas of the surrounding rock. These secondary stresses will deform the surrounding rock until a new balance is formed. relation. After the roadway is excavated, set the anchor cable at the same time as the anchor rod, and form the anchor rock support body through the reinforcement of the anchor rod, and the anchor cable will fix the formed anchor rock support body on the overlying stable rock layer superior. When the surrounding rock is greatly deformed, the bearing capacity of the bolt increases and the deformation increases. The corresponding load and deformation of the yielding anchor cable also increase, but due to the effect of the yielding tube, the surrounding rock will first flatten the yielding tube when the surrounding rock deforms, so that the deformation of the anchor cable can be coordinated with the deformation of the anchor rod while the bearing capacity increases . It can not only allow the surrounding rock to have a certain deformation, release the deformation of the surrounding rock to form a new equilibrium state, but also enable the anchor cable to maintain the bearing capacity, avoid being damaged and the surrounding rock can maintain its own stability within a certain deformation range.

Claims (2)

1. A yielding anchor cable, comprising an anchor cable body (5), a tray (4) arranged on the anchor cable body (5), and an anchor cable lock (1) for fixing the tail of the anchor cable body (5) , is characterized in that: a pressure relief device is provided between the tray (4) and the anchor cable lock (1), and an anchoring agent stirring head (6) is provided at the head of the anchor cable body (5). 2. The yielding anchor cable according to claim 1, characterized in that: the pressure yielding device consists of a pressure yielding tube (3) which protrudes in the middle and can provide a deformation space of 50-100 mm, and a pressure yielding tube (3) located on the pressure yielding tube. (3) Washers (2) at both ends constitute.

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