CN200996296Y - High-strength decompressing slip-casting rockbolt - Google Patents

Abstract

The high-strength pressure-relief grouting anchor rod of the utility model is suitable for supporting mines, tunnels and underground projects. It consists of a high-strength seamless steel pipe rod body. The front part of the rod body is provided with a twist-shaped anchor head. There is a resin drug roll baffle between the anchor head and the rod body. nuts. When the surrounding rock of the roadway is deformed, the pressure relief pipe is first flattened, so as to avoid the failure of the anchorage end of the rod body. After the surrounding rock is deformed, the stress concentration in the surrounding rock is released, and the joints and cracks in the surrounding rock develop. At this time, the grout can be fully injected by using the grouting anchor rod to cement the broken surrounding rock into a whole. The solidification of the grout can also make the grouting bolt realize full-length anchoring, so as to maintain the long-term stability of the roadway. It can save the use of ordinary bolts for initial support, the process is simple, and the installation is convenient. It can not only speed up the footage of the roadway, but also greatly reduce the cost of support.

Description

High-strength pressure relief grouting anchor

technical field

The utility model relates to a high-strength pressure-relieving grouting bolt, which is especially suitable for supporting high-stress broken surrounding rocks and extremely soft rock formations in mines, tunnels and underground projects.

Background technique

With the continuous development of my country's coal industry, many mining areas are encountering more and more weak and broken rock formations in varying degrees. Difficulties in supporting coal mines.

At present, metal shrinkable supports are mainly used in soft rock roadways in my country, which consume a lot of steel. In order to save steel and reduce support costs, various types of bolt support have been tested in soft rock roadways in relevant mining areas in recent years, such as: tensile anchor, composite anchor and anchor truss. Forms emerge one after another. However, the loosening range of the surrounding rock in the soft rock roadway is large, and the strength of the rock mass is low. It is difficult to completely compress the broken rock blocks to form a composite arch by simply using bolt support. Compared with masonry and metal bracket support, the greatest advantage of bolt support is that it can actively support the surrounding rock in time, but the anchoring force of bolt support depends largely on the mechanical properties of the anchored rock mass. Performance, in the soft rock roadway, the poor anchorability of the surrounding rock is an important reason for the low anchorage force and failure of the bolt. The anchoring and grouting support technology uses the inner cavity of the anchor rod as the grouting pipe, and combines the anchor rod and the grouting into one, which not only strengthens the surrounding rock by grouting, improves the self-supporting capacity of the surrounding rock, but also provides reliable support for the anchor rod. It is an effective way to solve the problem of soft rock roadway support. In the existing anchoring and grouting support technology, in the actual construction, anchoring and spraying are firstly used for primary support, so that the surrounding rock is fully relieved for a period of time, and the surrounding rock joints are fully developed, and then the grouting bolt is used for anchoring and grouting support. , Strengthen the surrounding rock to achieve permanent support. Therefore, the construction is more complicated, the support cost is higher, and the effect of the strength of the grouting bolt itself has not been fully utilized. Due to the large pressure and deformation of the surrounding rock when the roadway is just excavated, if the current grouting bolt is used for primary support directly, the grouting bolt will easily fail when the surrounding rock is deformed.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a high-strength pressure-relieving grouting anchor rod with compact and reasonable structure, convenient construction, low cost and good effect.

In order to achieve the above-mentioned purpose, the high-strength pressure-relieving grouting anchor rod of the present utility model includes a high-strength seamless steel pipe rod body. The aft sequence has a tray, pressure relief tube, washers and nuts to hold it in place.

The rod body is longitudinally and laterally provided with grouting holes intersecting each other at 90°; the pressure relief pipe is a hollow sleeve with a bulging middle.

The high-strength pressure relief grouting bolt of the utility model fully considers the pressure relief and grouting reinforcement of the roadway, organically combines the two, uses the hollow pressure relief pipe as the pressure relief device and the high-strength seamless steel pipe as the grouting device, When the surrounding rock of the roadway is deformed, the pressure relief pipe is first flattened, so as to avoid the failure of the anchorage end of the rod body. After the surrounding rock is deformed, the stress concentration in the surrounding rock is released, and the joints and cracks in the surrounding rock develop. At this time, the grouting of the grouting anchor can make the grout fully injected, and the broken surrounding rock is cemented into a whole. The solidification of the grout can also make the grouting bolt realize full-length anchoring, so as to maintain the long-term stability of the roadway. The process of using ordinary bolts is reduced, the roadway construction is accelerated, and the support cost is reduced. The process is simple and the installation is convenient. It can not only speed up the progress of the roadway, but also greatly reduce the support cost.

Description of drawings

Accompanying drawing is the structural diagram of the utility model.

In the figure: 1-twisted anchor head; 2-resin drug roll baffle; 3-rod body; 4-shooting hole; 5-tray; 6-iron washer; 7-pressure relief tube; nuts.

Detailed ways

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

As shown in the accompanying drawings, the utility model adopts high-strength seamless steel pipe as the rod body 3, and the rod body 3 is drilled with a grouting hole 4, and the hole distance is 120-180mm. The rock mass around the rod body. A section of twist-shaped anchoring head 1 is welded in front of the rod body 3, and the anchoring head 1 is made of a thick steel plate to improve the anchoring effect. A resin drug roll baffle 2 is provided between the anchor head 1 and the rod body 3 to prevent the resin at the anchor end from flowing down and reduce the anchor effect. The tail end of the rod body 3 is equipped with a tray 5 and a nut 9 to fix it, and a pressure relief pipe 7 is arranged between the tray 5 and the nut 9. The pressure relief pipe 7 is a hollow sleeve with a bulging middle part, which is conducive to deformation and pressure relief. An iron washer 6 is provided at both ends of the pipe 7 to balance the pressure on the pressure relief pipe 7 . Add a plastic washer 8 between the nut 9 and the iron washer 6 to prevent self-locking phenomenon due to excessive friction.

Claims (3)

1. The high-strength pressure relief grouting anchor is characterized in that it includes a high-strength seamless steel pipe rod body (3), and the front part of the rod body (3) is provided with a twist-shaped anchor head (1), and the anchor head (1) and the rod body ( 3) There is a resin drug roll baffle (2) between them, and the tail of the rod body (3) is provided with a fixing tray (5), a pressure relief pipe (7), a washer and a nut (9) in sequence. 2. The high-strength pressure-relief grouting anchor according to claim 1, characterized in that: the rod body (3) is provided with grouting holes (4) intersecting each other at 90° vertically and laterally. 3. The high-strength pressure relief grouting anchor according to claim 1, characterized in that: the pressure relief pipe (7) is a hollow sleeve with a bulge in the middle.

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