SELF-STABILIZING INTEGRALLY-MOLDED PILLAR FILLING STRUCTURE FOR UNDERGROUND MINES

Abstract

A self-stabilizing integrally-molded pillar filling structure for underground mines is provided, belonging to the field of supporting structures, which includes an airbag, and the airbag is provided with a feed filling port and a gas inflation port; a telescopic bearing piece, and the telescopic bearing piece is fixedly provided on an inner surface of the airbag and is capable of expanding and contracting with volume change of an inner cavity of the airbag; and steel hoops, and the steel hoops are fixedly provided on an outer surface of the airbag.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202311446834.0, filed on Nov. 2, 2023, the contents of which are hereby incorporated by reference.

TECHNICAL FIELD

The disclosure relates to the field of supporting structures, and in particular to a self-stabilizing integrally-molded pillar filling structure for underground mines.

BACKGROUND

At the end of mining at underground mine working face, the roof of the withdrawal roadway will be unstable, the mine pressure will be strong, and the moving amount of surrounding rock of roadway will increase. During the gob-side entry retaining, the rotary subsidence of the roof of the goaf side will cause great stress concentration on the roadway-side supporting body, and the deformation and bearing instability of the roadway-side filling body occur. Especially, during the current gob-side entry retaining and working face withdrawal, the roadway-side filling body is prone to produce eccentric load under the roof stress, resulting in shear failure. This leads to inadequate load-bearing capacity of the roadway-side filling body, which further accelerates its instability and failure. Therefore, maintaining the load-bearing capacity of the roadway-side filling body and the stable support of the filling body at the end of mining and during the gob-side entry retaining, it is the key to maintain the stability of underground mine road way.

At present, for the support of the filling body during the withdrawal roadway and the gob-side entry retaining, the filling body is mainly grouted by encircling the filling body with steel hoops. However, due to the poor flatness of the roadway floor, there will always be a certain inclination angle, and the flow of the filling slurry, the fluctuation of the filling rate and the gravity of the slurry itself, which will lead to the lateral displacement of the filling bag during the grouting process, thus leading to the inability of the filling body to form according to the preset state. Moreover, the filling body made of ordinary grouting filling bags often produces eccentric load after compression, resulting in shear failure of the filling body, which reduces the bearing strength of the filling body and ultimately affects the stability of the supporting roadway.

In view of this, how to provide a filling structure with sufficient bearing capacity to stably support the roadway is a technical problem that urgently needs to be solved by those skilled in the art.

SUMMARY

The objective of the disclosure is to provide a self-stabilizing integrally-molded pillar filling structure for underground mines, so as to solve the problems existing in the prior art and realize the function of improving the bearing capacity of the filling body and stably supporting the roadway.

In order to achieve the above objective, the disclosure provides the following technical solution. The disclosure provides a self-stabilizing integrally-molded pillar filling structure for underground mines, including:

• • an airbag, and the airbag is provided with a feed filling port and a gas inflation port;
  • a telescopic bearing piece, and the telescopic bearing piece is fixedly provided on an inner surface of the airbag and is capable of expanding and contracting with volume change of an inner cavity of the airbag; and
  • steel hoops, and the steel hoops are fixedly provided on an outer surface of the airbag.

Further, the telescopic bearing piece includes multiple inner layer strips and multiple outer layer strips, and the inner layer strips and the outer layer strips are hinged in pairs to form a telescopic rhombic net structure.

Further, each of the inner layer strips and the outer layer strips is integrally molded by pressing carbon fiber and graphite fiber at a ratio of 2:1.

Further, a width of each of the inner layer strips and the outer layer strips is 50 mm.

Further, the inner layer strips and the outer layer strips are hinged by hot-dip galvanized steel pipes.

Further, a bottom of the airbag is provided with a sliding rail, and lowermost ones of the inner layer strips and/or outer layer strips are slidably connected with the sliding rail.

The disclosure discloses the following technical effects.

The inner surface of the airbag is provided with the telescopic bearing piece which is capable of expanding and contracting with the volume change of the inner cavity of the airbag. The telescopic bearing piece expands as the airbag expands. After grouting and filling the inside of the airbag, the telescopic bearing piece is shaped and is capable of greatly improving the structural strength of the airbag depending on its structure and material, thus enhancing the bearing capacity and stably supporting the roadway.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the embodiments of the present disclosure or the technical solution in the prior art more clearly, the drawings needed in the embodiments will be briefly introduced below. Apparently, the drawings described below are only some embodiments of the present disclosure, and other drawings can be obtained according to these drawings without creative effort for those skilled in the art.

FIG. 1 is a schematic diagram of an overall structure of the present disclosure,

FIG. 2 is a schematic diagram of an internal structure of an airbag,

FIG. 3 is a schematic structural diagram of a telescopic bearing piece after expanding, and

FIG. 4 is a schematic structural diagram of the telescopic bearing piece after contracting.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the following, the technical solution in the embodiment of the disclosure will be clearly and completely described with reference to the attached drawings. Apparently, the described embodiments are only a part of the embodiment of the disclosure, but not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of protection of the present disclosure.

In order to make the above objects, features and advantages of the present disclosure more apparent and understandable, the present disclosure will be further described in detail with the attached drawings and specific embodiments.

Referring to FIGS. 1 to 4, the present disclosure provides a self-stabilizing integrally-molded pillar filling structure for underground mines, which includes an airbag 1, a telescopic bearing piece, and steel hoops 4. The airbag 1 is provided with a feed filling port 2 and a gas inflation port 3. The telescopic bearing piece is fixedly provided on an inner surface of the airbag 1 and the telescopic bearing piece is capable of expanding and contracting with volume change of an inner cavity of the airbag 1. And the steel hoops 4 are fixedly provided on an outer surface of the airbag 1.

In the embodiment, the telescopic bearing piece includes inner layer strips 5 and outer layer strips 6. There are several inner layer strips 5 and the outer layer strips 6, and the inner layer strips 5 and the outer layer strips 6 are hinged in pairs to form a telescopic rhombic net structure.

In the embodiment, the inner layer strip 5 and the outer layer strip 6 are each integrally molded by pressing carbon fiber and graphite fiber at the ratio of 2:1.

In the embodiment, the width of each of the inner layer strips 5 and the outer layer strips 6 is 50 mm.

In the embodiment, the inner layer strips 5 and the outer layer strips 6 are hinged by hot-dip galvanized steel pipes 7.

In the embodiment, a bottom of the airbag 1 is provided with a sliding rail 8, and lowermost ones of the inner layer strips 5 and/or outer layer strips 6 are slidably connected with the sliding rail 8.

The construction process is as follows.

The airbag with telescopic bearing piece is placed in the roadway area that needs to be supported, and is inflated through the gas inflation port 3, so that the airbag expands and the telescopic bearing piece expands accordingly. When the inflation of the airbag is completed, the gas inflation port 3 is closed, at this time, the shape of the airbag may be temporarily maintained by the telescopic bearing piece, and the feed filling port 2 is opened to grout and fill the inside of the airbag. During the process, the telescopic bearing piece ensures that the airbag will not be displaced in the transverse direction, and the telescopic bearing piece on the inner surface and the airbag are shaped after the airbag is filled, thereby greatly improving the structural strength of the filling bag, as well as enhancing the bearing capacity and stably supporting the roadway.

The disclosure discloses the self-stabilizing integrally-molded pillar filling structure for underground mines. The telescopic bearing piece, capable of expanding and contracting with the volume change of the inner cavity of an airbag 1, is arranged on the inner surface of the airbag. The telescopic bearing expands as the airbag expands. After grouting and filling the inside of the airbag, the telescopic bearing piece is shaped and is capable of greatly improving the structural strength of the airbag depending on its structure and material, thus improving the bearing capacity and stably supporting the roadway.

In the description of the present disclosure, it should be understood that the orientation or positional relationships indicated by the terms “longitudinal”, “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” are based on the orientation or positional relationship shown in the drawings are only for the convenience of describing the disclosure, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the disclosure.

The above-mentioned embodiments only describe the preferred mode of the disclosure, and do not limit the scope of the disclosure. Under the premise of not departing from the design spirit of the disclosure, various modifications and improvements made by those skilled in the art to the technical solution of the disclosure shall fall within the protection scope determined by the claims of the disclosure.

Claims

1. A self-stabilizing integrally-molded pillar filling structure for underground mines, comprising:

an airbag, wherein the airbag is provided with a feed filling port and a gas inflation port;

a telescopic bearing piece, wherein the telescopic bearing piece is fixedly provided on an inner surface of the airbag and is capable of expanding and contracting with volume change of an inner cavity of the airbag; and

steel hoops, wherein the steel hoops are fixedly provided on an outer surface of the airbag.

2. The self-stabilizing integrally-molded pillar filling structure for the underground mines according to claim 1, wherein the telescopic bearing piece comprises a plurality of inner layer strips and a plurality of outer layer strips, and the inner layer strips and the outer layer strips are hinged in pairs to form a telescopic rhombic net structure.

3. The self-stabilizing integrally-molded pillar filling structure for the underground mines according to claim 2, wherein each of the inner layer strips and the outer layer strips is integrally molded by pressing carbon fiber and graphite fiber at a ratio of 2:1.

4. The self-stabilizing integrally-molded pillar filling structure for the underground mines according to claim 3, wherein a width of each of the inner layer strips and the outer layer strips is 50 mm.

5. The self-stabilizing integrally-molded pillar filling structure for the underground mines according to claim 2, wherein the inner layer strips and the outer layer strips are hinged by hot-dip galvanized steel pipes.

6. The self-stabilizing integrally-molded pillar filling structure for the underground mines according to claim 2, wherein a bottom of the airbag is provided with a sliding rail, and lowermost ones of the inner layer strips and/or outer layer strips are slidably connected with the sliding rail.