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A roadside support system for gob-side entry retention and its construction method

A goaf and support device technology, which is applied in earth-moving drilling, shaft equipment, wellbore lining, etc., can solve the problems of insufficient vertical and horizontal bearing capacity of roadside support bodies and high support costs, and improve coal mining. efficiency, reduce the cost of lane retention, and achieve the effect of recycling

Active Publication Date: 2019-03-29
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention is applicable to medium-thick coal seams in deep wells, and effectively solves the technical problem of gob-side entry retention in deep wells and medium-thick coal seams, namely, the problems of insufficient vertical and horizontal bearing capacity of roadside support bodies and high support costs

Method used

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  • A roadside support system for gob-side entry retention and its construction method
  • A roadside support system for gob-side entry retention and its construction method
  • A roadside support system for gob-side entry retention and its construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1 A roadside support system for gob-side entry retention

[0054] like Figure 1-Figure 8 As shown, the support system for gob-side entry retaining includes steel pipe concrete pier supporting device 1, light aggregate flexible concrete spray layer 2, air duct cloth 3 and diamond-shaped steel mesh 4, and diamond-shaped steel mesh 4 is set along one side of the gob. Air duct cloth 3 is laid on the inner side of diamond-shaped steel mesh 4, and light aggregate concrete is used for spraying treatment on air duct cloth 3 and diamond-shaped steel mesh 4, and an airtight light aggregate concrete spray layer 2 is formed on the side of the gob. The thickness of the concrete sprayed layer 2 is 200mm-500mm, and the other side of the light aggregate concrete sprayed layer 2 is close to the steel pipe concrete pier supporting device 1;

[0055] The concrete-filled steel pipe pier supporting device 1 includes a concrete-filled steel pipe pier 5, a pier shoe plate 6, a pi...

Embodiment 2

[0061] The composition of embodiment 2 light aggregate concrete

[0062] The composition of light aggregate concrete is (kg / m 3 ): cement 450, ceramsite 650, sand 650, mineral powder 50, water 125, water reducing agent 3; the strength grade of light aggregate concrete is CL50, and the apparent density is 800-1000kg / m 3 .

Embodiment 3

[0063] Embodiment 3 Construction method of roadside support system for gob-side entry retention

[0064] Specific steps are as follows:

[0065] (1) First, the empty steel pipe pier column body, pier top cap and pier shoe plate are processed on the ground, the outer side of the steel pipe concrete pier top is processed into a threaded opening, the lower part is provided with a grouting port, and one side of the steel pipe concrete pier Spot welding of bending-resistant round steel;

[0066] (2) Suspend diamond-shaped steel mesh and air duct cloth at the edge of the goaf side of the reserved roadway, and use light aggregate concrete for spraying treatment to form airtight light aggregate concrete on the gob side spraying layer, sealing the goaf, and the thickness of the light aggregate concrete spraying layer is 200mm-500mm;

[0067] (3) Empty steel pipe piers are erected on the side of the goaf of the reserved roadway close to the light aggregate concrete sprayed layer. The ...

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Abstract

The invention relates to a gob-side entry retaining roadside support system and a construction method thereof. A rhombic steel bar net is arranged on one side of a gob, an air drum cloth is laid on the inner side of the rhombic steel bar net, light aggregate concrete is adopted to perform guniting treatment on the air drum cloth and the rhombic steel bar net, a windtight light aggregate concrete spray layer is formed on the side of the gob, the thickness of the light aggregate concrete spray layer is 200-500 mm, and the other side of the light aggregate concrete spray layer is close to a steel tube concrete pier stud supporting device. A steel tube concrete pier stud is formed by filling an empty steel tube with concrete; through a restraint effect of a steel tube casing, internal concrete is in a three-dimensional stressed state, the geometrical stability of the steel tube wall is enhanced, and the bearing capacity of the steel tube concrete pier stud is improved. According to the gob-side entry retaining roadside support system, a top plate can be supported in high strength, coal mining efficiency is effectively improved, and an operation environment in a roadway is improved; the steel tube concrete pier stud can be recycled through a special thrust device, and the roadway retained cost is reduced.

Description

technical field [0001] The invention relates to a gobside retaining system and construction method thereof, in particular to a gobside retaining system and construction method of recyclable steel pipe concrete piers, which belong to the gobside retaining system of deep wells with medium-thick coal seams Alley field. Background technique [0002] Gobside entry retention is to maintain the used mining roadway along the boundary of the goaf behind the working face and serve for the mining of the next section of coal seam. This technology can realize Y-shaped ventilation, improve the recovery rate of coal resources, reduce It is extremely beneficial to improve mine economic benefits and mine safety production by reducing the amount of roadway excavation, alleviating the contradiction between excavation and replacement, preventing the occurrence of isolated working faces, and shortening the moving time. [0003] At present, the commonly used gob-side retaining technology include...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D11/14E21D11/12
CPCE21D11/10E21D11/107E21D11/12E21D11/14
Inventor 王军陈冰慧黄万朋曲广龙王正泽左建平
Owner SHANDONG JIANZHU UNIV
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