CN205370580U - Deep is moved by force and is carried tunnel scour protection resistance to compression supporting construction - Google Patents

Abstract

The utility model discloses an anti-shock and anti-compression support structure of a deep strong dynamic load roadway, which comprises a three-layer structure, the outermost layer is an anchor shotcrete support, the middle layer is a composite foam metal material (anti-shovel and anti-compression layer), and the innermost The layer is supported by shrinkable U-shaped steel. The outermost layer is the reinforced part of the outer rock shell of the roadway, which is supported by yield bolts and anchor cables, which can not only achieve the joint surrounding rock mass, improve the overall strength and bearing capacity of the rock mass, but also enhance the adaptability of deformation resistance; the middle layer adopts Composite foam metal material, which is fastened on the outer concrete shotcrete layer of the anchor shotcrete support to form the main anti-shock and compression layer, which improves the dynamic pressure bearing capacity of the roadway structure; the innermost layer of shrinkable U-shaped steel support Play the role of overall stability and support resistance. The structure of the utility model is suitable for roadway support in the deep part where there is a risk of rock burst, and achieves the support effect of coexistence of rigidity and flexibility.

Description

Anti-scour and compressive support structure of deep strong dynamic load roadway

Technical field:

The utility model relates to the field of roadway support, and is especially suitable for roadway support in deep parts with the risk of rock burst.

Background technique:

The roadway is an important channel for underground mine transportation, ventilation, drainage, power supply and other systems, and is the key to the continuation of mine production. The roadway with shallow mining or better geological conditions has good stability, and the phenomenon of dynamic pressure damage is not serious. However, as my country's coal mine resource mining gradually develops to the deep, the conditions are complex, the ground stress is large, and the frequency of dynamic pressure is increasing, and its hazards are also increasing, resulting in damage to the outer rock crust of the roadway, collapse and casualties. , causing great harm to coal mine production safety. Although many measures have been taken in recent years, the total number of rock burst disasters in mines across the country has not decreased. At present, more than 150 mines across the country have experienced rock burst accidents, and as the depth of coal mining continues to deepen, this dynamic phenomenon will become more severe. Most of the existing coal mine support structures are support structures under static surrounding rock pressure, such as anchor mesh support, anchor shotcrete support, U-shaped steel shed support, large hydraulic support support, etc. Although these structures can strengthen the surrounding However, its deformation resistance adaptability is poor, and it cannot adapt to short-term and high-intensity rock burst. It can be seen that the task of prevention and control of rock burst in my country is very arduous, with realistic urgency and long-term significance.

For the roadway support in deep areas with rockburst risks, two points must be achieved: first, to improve the bearing capacity of the roadway against deep underground rockburst loads by improving the bearing capacity of the structure itself; second, to a certain extent Compatible with surrounding rock deformation. Existing support structures such as anchor mesh support, anchor shotcrete support, U-shaped steel shed support, and large hydraulic support support cannot well meet the above two requirements. The anti-shock and anti-compression support structure of the deep strong dynamic load roadway of the utility model first improves the bearing capacity of the surrounding rock with the help of the outermost layer of anchor spray support, and then buffers the impact load with the help of the middle layer of composite foam metal material (anti-shock and anti-pressure layer) And absorb the impact energy, and finally use the innermost shrinkable U-shaped steel support to play the role of overall stability and support resistance. The utility model has very important practical application value for ensuring safe production in coal mines.

Utility model content:

The problem to be solved by the utility model is to provide a roadway support structure in which there is a danger of rock burst in the deep part.

The technical scheme adopted by the utility model is: the anti-scourage and compression-resistant support structure of the deep strong dynamic load roadway, which includes a three-layer structure, the outermost layer is the anchor-spray support, and the middle layer is composite foam metal material (anti-scourage and compression resistance) layer), the innermost layer is a shrinkable U-shaped steel support, and the utility model is suitable for the roadway support in the deep part with the risk of rock burst.

The outermost layer is the anchor net spray support, which is composed of anchor rods, anchor cables, and concrete joint support. The anchor rods are arranged in a rhombus shape, with a length of 1.2-1.5m, a distance of about 0.5m, and an anchoring force of 50-70kN; The anchor cables are arranged in a rectangle with a length of 5-10m, and the distance between them is not less than one-third of the length of the anchor cables. They are generally arranged in the surrounding rock at the top of the roadway. The use of yield bolts and anchor cables for support not only achieves jointing with the surrounding rock mass, improves the overall strength and bearing capacity of the rock mass, but also enhances the adaptability of deformation resistance; the concrete spraying is not less than 200mm. The outermost layer constitutes the strengthening part of the surrounding rock crust of the roadway.

The middle layer is a composite metal foam material, which is used as an anti-shock and compression layer of the entire support structure to reduce the peak value of the compression wave, improve the distribution of the surrounding load of the structure, and reduce the buffering and energy-absorbing effect of the dynamic response of the structure; the composite metal foam The material is a kind of foam material obtained by mixing, molding and solidifying hollow microspheres and metal matrix. Its thickness is 60-80 mm, and its pore diameter is 154 μm, which has higher energy absorption capacity and energy absorption efficiency;

The innermost layer is composed of steel mesh, shrinkable U-shaped steel and connecting members. The steel bar diameter of the steel mesh is 3mm, and the aperture of the mesh is not less than 2mm. The shrinkable U-shaped steel is composed of top beams, column legs , connectors and inter-frame tie rods, the strength of which should be at least 29U, and the support spacing should be less than 700mm. The innermost layer constitutes the support part of the inner structure, which plays the role of overall stability and support resistance.

The advantages and positive effects of the utility model are: the anti-shock and compression support structure of the deep strong dynamic load roadway, which includes a three-layer structure, especially the composite foam metal material in the middle layer is used as the anti-shock and compression layer, in a rather large It can maintain a constant load within the strain range, thus exhibiting excellent energy buffering and absorption performance. The utility model can solve the difficult problem of roadway support in the deep part with the risk of rock burst.

Description of drawings:

Fig. 1 is a structural representation of the utility model.

Fig. 2 is the structural representation of the composite foam metal material of the present utility model

Fig. 3 is a structural schematic diagram of the shrinkable U-shaped steel of the utility model.

Among them: 1-anchor shotcrete support, 2-anchor rod, 3-anchor cable, 4-concrete sprayed layer, 5-composite foam metal material, 6-shrinkable U-shaped steel support, 7-upper U-shaped steel, 8- The lower U-shaped steel, 9-cable type hoop.

detailed description:

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the anti-scour and compressive support structure of the deep strong dynamic load roadway described in the utility model is composed of three parts, the outermost layer is the anchor shotcrete support 1, the middle layer is the composite foam metal material 5, and the outermost layer is the composite foam metal material 5. The inner layer is a shrinkable U-shaped steel support 6.

First, carry out bolting and shotcreting support for the roadway just dug, and arrange the anchor rods 2 with a length of 1.2 to 1.5 m in the surrounding rock evenly at intervals of 0.5 meters, then spray concrete 4, and wait for the bolting and spraying support 1 After the roadway surrounding rock is stabilized, the anchor cable 3 is arranged in the roadway top surrounding rock. The use of yield bolts and anchor cables for support can not only combine the surrounding rock mass, improve the overall strength and bearing capacity of the rock mass, but also enhance the adaptability of deformation resistance.

Then arrange composite foam metal material with a thickness of 60-80mm, and fasten it on the outer concrete shotcrete layer of anchor shotcrete support to form the main anti-shock and compression layer, so as to improve the dynamic pressure bearing capacity of the roadway.

Finally, the steel mesh, shrinkable U-shaped steel and connecting components are arranged on the innermost layer. The strength should be at least 29U, and the support spacing should be less than 700mm, so as to play the role of overall stability and support resistance.

Claims (4)

1. The anti-scour and compressive support structure of the deep strong dynamic load roadway, which includes a three-layer structure, the outermost layer is the anchor shotcrete support, the middle layer is the composite foam metal material anti-scour and compressive layer, and the innermost layer is the shrinkable The U-shaped steel support is characterized in that: the composite foam metal material is fastened on the outer concrete sprayed layer of the anchor shotcrete support to form a main anti-shock and compression layer, which improves the dynamic pressure bearing capacity of the roadway structure; the anchor shotcrete support The combination of support, composite foam metal material and shrinkable U-shaped steel support forms a "rigid-flexible-rigid" support structure. 2. The anti-erosion and compression support structure of deep strong dynamic load roadway according to claim 1, characterized in that: the outermost layer is anchor mesh spray support composed of anchor rods, anchor cables, and concrete joint support, The anchor rods are arranged in a rhombus shape, with a length of 1.2-1.5m, a spacing of about 0.5m, and an anchoring force of 50-70kN; the anchor cables are arranged in a rectangular shape, with a length of 5-10m, and the spacing is not less than one-third of the length of the anchor cables. 1. The concrete shall be sprayed no less than 200mm. 3. The anti-shock and compression support structure of deep strong dynamic load roadway according to claim 1, characterized in that: the intermediate layer is a composite foam metal material, which acts as the anti-shock and compression layer of the entire support structure. The function of cushioning and energy absorption; the composite foam metal material is a kind of foam material obtained by mixing, molding and solidifying hollow microspheres and metal matrix. Energy absorption capacity and energy absorption efficiency. 4. The anti-erosion and compression support structure of deep strong dynamic load roadway according to claim 1, characterized in that: the innermost layer is composed of steel mesh, shrinkable U-shaped steel and connecting members, and the steel mesh The steel bar diameter is 3mm, and the hole diameter of the net is not less than 2mm. The shrinkable U-shaped steel is composed of top beams, column legs, connectors and inter-frame tie rods. The strength is at least 29U, and the support distance is less than 700mm.