CN2903375Y

CN2903375Y - Steel reinforced concrete combined support for coalmine tunnel

Info

Publication number: CN2903375Y
Application number: CN 200620070171
Authority: CN
Inventors: 杨波
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-13
Filing date: 2006-03-13
Publication date: 2007-05-23
Anticipated expiration: 2016-03-13

Abstract

The utility model relates to a coal mine down-hole support which provides a coal mine down-hole tunnel reinforced concrete united support and comprises an anchor rod, an anchor rope and an archy concrete body. Wherein, the outer side face of the archy concrete body is evenly connected with the one end of the anchor rod and the anchor rope in radial form and the other end thereof is disposed inside the rock wall of the tunnel. The reinforcing steel skeleton is provided inside the archy concrete body. The coal mine down-hole support is characterized by low weight with 10 kilograms lower than U-shaped reinforcing steel per meter, fast speed forming the tunnel, small deformation of the tunnel with only 200-300 mm, resistance to cracking and peeling off thereby, guaranteeing human safety and requiring no repeated maintenance even with the slow sinking of the tunnel under the long-term pressure.

Description

Colliery underworkings steel bar concrete combined supporting

Technical field

The utility model relates to supporting under the coal mine.

Background technology

At present, the roadway support form in rock crusher zone, China down-hole adopts " U " type steel shed support mostly, cement backboard and metal rhombus net back of the body group back of the body top; When adjoining rock stability, adopt anchor pole, anchor cable, the supporting of wire lath spray concrete.Supporting and domesticly do not have a big difference under the external coal mine.There is the supporting instability in this technical scheme, especially has the problem that side pressure is big, pucking is serious; There are to fall quarrel, scaling simultaneously, influence the problem of underground operators personal safety.

Summary of the invention

The purpose of this utility model is: provide a kind of and solve that side pressure is big, pucking, guarantee the colliery underworkings steel bar concrete combined supporting of underground work safety.

Concrete structural design scheme is as follows:

Colliery underworkings steel bar concrete combined supporting is characterized in that: comprise anchor pole 2, anchor cable 3 and arch concrete body 1; Anchor pole more than 10 is the uniform lateral surface that is being connected arch concrete body of a radial end with anchor cable more than 3, and the other end is positioned at the crag in tunnel.

Be provided with cage of reinforcement in the described arch concrete body, described cage of reinforcement comprises hogring muscle 4, connects to form a joint support by longitudinal rib 6 between the adjacent two hogring muscle 4, is connected by dowel 5 between the hogring muscle 4 of an adjacent joint support.

Useful technique effect of the present utility model is embodied in following several aspect:

1, this supporting and protection structure is in light weight, every meter lighter 10 kilograms than U type steel shed, about 80 kilograms in light weight at each joint of its cage of reinforcement than U type canopy, having alleviated operator's labour intensity greatly, used this supporting roadway deformation amount little, only is the 200-300 millimeter, the tunnel presents slow sinking under long-time pressure effect, the scaling of not ftractureing can guarantee personal safety, does not need to repeat maintenance.

2, it is fast that the utility model supporting and protection structure becomes lane speed, and U type canopy is 0.5 meter one and this supporting is one in a 0.8-1 rice, and constructing operation is easy.

3, this supporting can realize effective support to breaking roof.One deck steel fiber concrete be can spray earlier after meeting head on to dig out,, and then anchor pole and cage of reinforcement concrete secondary supporting beaten as temporary lining, very effective to the roof cracking of meeting head on, guaranteed workman's safety.

4, this kind supporting is firm durable, and is not easy to crack, and quarrel is fallen in not scaling, and long-term bearing load ability is strong, and good toughness can not become piece to drop, and also do not fall quarrel even be cleaved into small gap, guaranteed constructor's safety.

Description of drawings

Fig. 1 is the utility model structural representation,

Fig. 2 is the utility model structural representation with cage of reinforcement,

Fig. 3 be the A of Fig. 2 to view,

Fig. 4 is the B-B sectional view of Fig. 3.

The specific embodiment

Below in conjunction with accompanying drawing, the utility model is further described by embodiment.

Embodiment 1:

Colliery underworkings steel bar concrete combined supporting comprises anchor pole 2, anchor cable 3 and arch concrete body 1; Anchor pole 2 more than 10 is the uniform lateral surface that is being connected arch concrete body 3 of a radial end with the anchor cable 3 more than 3, and the other end is positioned at the crag in tunnel.See Fig. 1.

After work plane meets head on to excavate outline line, look for clean foam danger cash, with high pressure water washing lane group top, the close plating net is beaten anchor pole then.With the high strength anchor bar of diameter 20 * 2200, accomplish fluently anchor pole by array pitch between 800 * 800 millimeters, anchor pole exposes between the 20-50 millimeter, and every hole is with 2 volume Z2850 type anchoring agent, and mixing time is not less than 25 seconds.

Begin to spray steel fiber concrete after having beaten anchor pole, the concrete ratio is a cement: yellow ground: cobble is 1: 2: 2, and cement is with being not less than No. 425 Portland cements or portland slag cement.Thick molding sand during yellow ground is used, fineness modulus generally should be greater than 2.5, and moisture content is controlled at 5%-7%, and coarse aggregate adopts firm durable cobble or rubble, so particle diameter should not be greatly 5 millimeters.

Steel fibre adopt on splint around a circle not the side of fractureing be certified products, mix in the dried volume that gathers materials 1% ratio of concrete, uniform mixing, spray just is 50-80 millimeter thickness, carries out multiple spray at interval in 10 minutes, is arch concrete body after the shaping.

This structure is applicable to country rock normal condition or broken a little situation, but can come to a halt anchor pole, anchor cable, and side pressure is not very big, though the cracking small gap also not scaling fall quarrel, globality is very good, intensity height, bearing load ability are strong.

Embodiment 2:

On the basis of embodiment 1, in arch concrete body 1, have additional cage of reinforcement.See Fig. 2, Fig. 3 and Fig. 4.Cage of reinforcement 1 comprises hogring muscle 4, connects to form a joint support by longitudinal rib 6 between the adjacent two hogring muscle 4, is connected by dowel 5 between the hogring muscle 4 of an adjacent joint support.

In the construction, after meeting head on to excavate required section, look for clean float stone danger cash (coal cinder), with high pressure water washing tunnel group top, spray 50 millimeters thick one decks with steel fibrous concrete on tunnel group top then, upright again cage of reinforcement, cage of reinforcement adjacent segments lap-joint tightens with U type clamp, each bar splicing place two road clamps, lap length is 400 millimeters.The crosspoint connects with No. 16 bifilar iron wires, tightens with little crowbar, and cage of reinforcement and whole dowel connect the back and just can spray steel fiber concrete again.

Embodiment 3:

During the tunnelling supporting, do not beat anchor pole in the coal seam or in the tomography.

Working programme is, work plane meets head on to look for clean float stone danger bar after coal or rock excavate profile, sprays one deck 50 millimeters thick steel fiber concretes immediately, and the upright cage of reinforcement of linked network is installed connecting reinforcement then, just can pneumatically placed concrete, spraying back 150 millimeters, portion's thickness is 200 millimeters.

Claims

1, colliery underworkings steel bar concrete combined supporting is characterized in that: comprise anchor pole (2), anchor cable (3) and arch concrete body (1); Anchor pole more than 10 is the uniform lateral surface that is being connected arch concrete body of a radial end with anchor cable more than 3, and the other end is positioned at the crag in tunnel.

2, colliery according to claim 1 underworkings steel bar concrete combined supporting, it is characterized in that: be provided with cage of reinforcement in the described arch concrete body, described cage of reinforcement comprises hogring muscle (4), connect to form a joint support by longitudinal rib (6) between the adjacent two hogring muscle (4), connect by dowel (5) between the hogring muscle (4) of an adjacent joint support.