CN202745898U

CN202745898U - Deep soft rock tunnel tensile reinforced concrete spraying body supporting structure

Info

Publication number: CN202745898U
Application number: CN 201220103526
Authority: CN
Inventors: 张京泉
Original assignee: Xiezhuang Coal Mine Xinwen Mining Industry Group Co Ltd
Current assignee: Xiezhuang Coal Mine Xinwen Mining Industry Group Co Ltd
Priority date: 2012-03-19
Filing date: 2012-03-19
Publication date: 2013-02-20
Anticipated expiration: 2022-03-19

Abstract

The utility model discloses a deep soft rock tunnel tensile reinforced concrete spraying body supporting structure. A first layer of concrete with a thickness of 50 mm is sprayed on a blasted tunnel surrounding rock, a primary supporting anchor rod is installed through holing on the first layer of concrete, and two layers of reinforcing meshes are hung and fastened on the primary supporting anchor rod and are connected with each other through a reinforcing hook; a second layer of concrete with a thickness of 100 mm is sprayed on the two layers of reinforcing meshes; a secondary supporting anchor rod is installed through holing on the second layer of concrete, is staggered with the primary supporting anchor rod in position and is arranged in a plum blossom shape; and a third layer of concrete with a thickness of more than 50 mm is sprayed outside the secondary supporting anchor rod and covers the exposed part of the secondary supporting anchor rod. The deep soft rock tunnel tensile reinforced concrete spraying body supporting structure has the beneficial effects that on the basis of fully researching and analyzing the damage form and the mechanism of a broken surrounding rock tunnel, a tensile reinforced concrete spraying body supporting technology is put forward, and the difficulty problem of supporting of a deep soft rock tunnel is solved.

Description

Deep Soft Rock Tunnel tensile reinforcement concrete sprinkler body supporting and protection structure

Technical field

The utility model relates to the colliery tunnel support technology, especially the support technology of deep tunnel more than 800 meters.

Background technology

Coal is as one of main energy sources, in China always in occupation of very important position, especially along with China's modernization construction and economic developing rapidly, the demand of resource also constantly increases, continuous expansion along with the exploitation scale, the coal resources that superficial part is easily adopted are increasingly exhausted, and exploitation is the inexorable trend of underground mine to the deep development.

Because the main body of deep mining country rock is coal measure strata, extensively folder is grown structural plane by deposition, weak intercalated layer and argillization interlayer in coal measure strata, the deep rock mass many places are in " three height " complex environment of (the gentle high rock of heavily stressed, height holds hydraulic pressure) in addition, the part tunnel also is subject to strong digging disturbing influence, makes deep tunnel supporting problem more complicated.According to statistics, the pit mining degree of depth of the whole nation more than 60% reached more than 800 meters, for example the Xie Zhuan colliery now is extended deep to-1100 meters levels as the old ore deposit of a century, the tunnel buried depth reaches 1150 meters, roadway surrounding rock significantly presents the high ground stress soft rock stress characteristic under the effect of deep high-ground stress, deep tunnel supporting difficulty, destroy seriously, engendered the destruction forms such as anchor pole inefficacy, sprinkler body come off, crush.

For solving the mining problem of Deep Mine, experts and scholars have successively carried out a large amount of research and useful exploration to the deep tunnel support technology both at home and abroad, the technology such as multiple canopy, dense bolt, grouting and reinforcing have been worked out, but at the support technology that has mostly followed the shallow workings aspect the supporting of deep tunnel, the research of bolting and shotcrete roadway support technology and the aspect researchs such as control of improving stability of surrounding rocks in roadway also still are weak, much still are in space state.

Summary of the invention

For solving deep tunnel supporting hard problem more than 800 meters, the utility model is on the basis of fully researching and analysing breaking surrounding rock tunnel destruction form and mechanism, tensile reinforcement concrete sprinkler body supporting and protection structure has been proposed, through the on-the-spot proof of repeatedly practising, this technology effectively raises the supporting intensity in tunnel, has solved the supporting difficult problem of Deep Soft Rock Tunnel.

For achieving the above object, structure of the present utility model is: it is just to be sprayed with the thick first floor concrete of 50mm on the roadway surrounding rock after blowing out, by the perforating of first floor concrete the once supporting anchor pole is installed, hangs on the once supporting anchor pole head and fastened two-layer steel mesh reinforcement, use between the two-layer steel mesh reinforcement

Figure DEST_PATH_DEST_PATH_FDA00001997400100011

Steel reinforcement hook is linked togather; Be sprayed with the second layer concrete of 100mm at two-layer steel mesh reinforcement; Installing the secondary supporting anchor pole by the perforating of second layer concrete, staggers and is quincuncial arrangement in secondary supporting anchor pole and once supporting anchor pole position; Spray thick the 3rd layer concrete greater than 50mm outside the secondary supporting anchor pole, the 3rd layer concrete covers secondary supporting anchor pole exposed parts again.

The utility model tensile reinforcement concrete sprinkler body supporting and protection structure has been compared following major advantage with support forms such as anchor net spray secondary supporting in the past and multiple canopies:

1, the utility model supporting and protection structure adopts the double steel bar net to cooperate the concrete support tunnel, frictional force and bond between steel mesh reinforcement and the concrete have been increased, tension, the shear strength of support material have been increased, make tensile strength and the concrete compressive strength of reinforcing bar all obtain fully playing, increase supporting intensity, avoided the accident because the laitance coating that tunnel later stage being damaged deformation causes ftractures, crushes etc.;

2, the utility model supporting and protection structure is by adopting measures such as adopting the connection of equal strength dowel between anchor pole pressure network, concrete cover net, the Double-level Reticulated, whole support materials in tunnel are integrated effectively, promoted the mechanical property of support material, make it jointly bear surrouding rock deformation, increased the supporting intensity in tunnel;

3, the utility model supporting and protection structure has reduced roadway deformation and reinstatement works amount than anchor net spray secondary supporting technique, has avoided because the potential safety hazard that laitance coating ftractures, comes off and cause; The canopy support process has been avoided passive protecting again, has saved support material, has accelerated speed of application, has higher application value.

Description of drawings

Fig. 1 is the schematic diagram of the utility model embodiment;

Fig. 2 is A section enlarged drawing among Fig. 1.

Among the figure: 1-once supporting anchor pole, 2-first floor concrete, 3-first floor steel mesh reinforcement, 4-second layer steel mesh reinforcement, 5-secondary supporting anchor pole, 6-second layer concrete, 7-the 3rd layer concrete.

The specific embodiment

Further specify the technical solution of the utility model below in conjunction with implementation operation and accompanying drawing.

-850 horizontal transports of the applicant colliery construction deep tunnel such as go down the hill, because buried depth is large, country rock presents significantly softening and reduction phenomenon, and because geological structure and degrade edge effect, the many places, tunnel disclose red beds, cause country rock soft, strength decreased, adopt conventional anchor net spray secondary supporting technique can't satisfy the roadway support requirement, therefore we fell and transport the tensile reinforcement concrete sprinkler body support technology of the tunnel adoption of innovation such as having failed in-850 levels three, effectively controlled the distortion of Deep Soft Rock Tunnel, guaranteed supporting effect, supporting and protection structure such as Fig. 1 and Fig. 2.

As shown in the figure, it is just to be sprayed with the thick first floor concrete 2 of 50mm on the roadway surrounding rock after blowing out, by 2 perforatings of first floor concrete once supporting anchor pole 1 is installed, 1 upper extension of once supporting anchor pole has been fastened first floor steel mesh reinforcement 3 and second layer steel mesh reinforcement 4, uses between first floor steel mesh reinforcement 3 and the second layer steel mesh reinforcement 4

Figure 870953DEST_PATH_DEST_PATH_FDA00001997400100011

Steel reinforcement hook is linked togather; Be sprayed with the second layer concrete 6 of 100mm at two-layer steel mesh reinforcement; Install secondary supporting anchor pole 5 by 6 perforatings of second layer concrete, secondary supporting anchor pole 5 staggers with once supporting anchor pole 1 position and is quincuncial arrangement; Spraying thick the 3rd layer concrete 7, the three layer concretes 7 greater than 50mm outside secondary supporting anchor pole 5 covers secondary supporting anchor pole 5 exposed parts again.

The Specific construction step is as follows:

The first step: on roadway surrounding rock, just spray the thick first floor concrete 2 of 50mm after blowing out, according to array pitch 800 * 800mm perforating an once supporting anchor pole 1, once supporting anchor pole 1 diameter are installed

Long 2400mm, and outside the hole, reserve the anchor pole head of hanging first floor steel mesh reinforcement 3;

Second step: fasten first floor steel mesh reinforcement 3 at 1 extension of once supporting anchor pole of reserving, on first floor steel mesh reinforcement 3, bundle according to array pitch 400 * 400mm

Figure 788093DEST_PATH_DEST_PATH_FDA00001997400100011

Dowel, then hang second layer steel mesh reinforcement 4, with second layer steel mesh reinforcement 4 and first floor steel mesh reinforcement 3 usefulness

Figure 567830DEST_PATH_DEST_PATH_FDA00001997400100011

Steel reinforcement hook is linked togather;

The 3rd step: the second gunite is carried out in the tunnel after the linked network, spray the second layer concrete 6 of thick 100mm, whitewashing is sequentially served as reasons the end to the top;

The 4th step: behind the second gunite, according to array pitch perforating between 800 * 800mm secondary supporting anchor pole 5 is installed again, and is staggered with once supporting anchor pole 1 position and to be quincuncial arrangement;

The 5th step: covering, twice support anchor rod 5 exposed parts of whitewashing for the third time, spray thick the 3rd layer concrete 7 greater than 50mm.

Claims

1. Deep Soft Rock Tunnel tensile reinforcement concrete sprinkler body supporting and protection structure, it is characterized in that, it is just to be sprayed with the thick first floor concrete of 50mm on the roadway surrounding rock after blowing out, by the perforating of first floor concrete the once supporting anchor pole is installed, hang on the once supporting anchor pole head and fastened two-layer steel mesh reinforcement, use between the two-layer steel mesh reinforcement

Steel reinforcement hook is linked togather; Be sprayed with the thick second layer concrete of 100mm at two-layer steel mesh reinforcement; Installing the secondary supporting anchor pole by the perforating of second layer concrete, staggers and is quincuncial arrangement in secondary supporting anchor pole and once supporting anchor pole position; Spray thick the 3rd layer concrete greater than 50mm outside the secondary supporting anchor pole, the 3rd layer concrete covers secondary supporting anchor pole exposed parts again.