CN202266277U - Contractible strut for U-shaped shed support - Google Patents

Abstract

The utility model relates to a retractable pillar for supporting a U-shaped shed, which includes an upper pillar and a lower pillar connected by a clamp cable, and a tray is arranged on the top of the upper pillar. The retractable point column of the utility model is applied to U-shaped shed support. When the roadway is pressed, the two-section column can withstand the pressure and sink slowly by relying on frictional resistance. The scalability of the column makes the column generate flexible resistance to the transmitted pressure, protecting The rigid damage of the pillars under the huge pressure is reduced, and the deformation of the U-shaped shed beams is reduced at the same time, and the shape of the roadway is maintained. It cannot change the pressure value of the U-shaped shed support, but it can enhance the overall load-bearing capacity of the support through self-adjustment, so that the force of the support is more uniform, and it is not easy to form a weak surface on the support, causing the support to be damaged. Destruction occurs in a local area, which eventually leads to the overall failure of the stent.

Description

Retractable support for U-shaped shed support

technical field

The utility model belongs to the technical field of coal mine roadway support, in particular to a retractable pillar for U-shaped shed support.

Background technique

In order to improve the maintenance status of coal mine roadways in my country, in addition to the development of bolt support, in some three-soft coal seams, especially in roadways with broken roofs, bolts are not easy to anchor. The use of metal brackets is another important development in the reform of roadway support in coal mines in my country direction. At present, the proportion of such supports accounts for nearly a quarter of the country's state-owned coal mine roadways.

In recent years, the support experience in deep mine roadways mainly includes the following points: ① In terms of roadway design and layout, firstly, the roadway is required to have sufficient excavation sections to allow the surrounding rock of the roadway to converge; secondly, try to avoid the pressure peak area, preferably in the In the pressure relief zone, the surrounding rock pressure of the roadway is minimized; ②A closed, multi-layer support system is mostly used, and a "sandwich" type overall support is composed of incompressible filling materials-pressure layer-bearing layer; ③Make full use of grouting reinforcement The joint support method of anchor-spraying-branch-net can maximize the self-supporting ability of the surrounding rock of the roadway; ④All the mining quasi-roadways are supported by arch-shaped retractable metal brackets; special attention is paid to the quality of support erection, At the same time, it is also considered to improve the quality of the section steel, increase the weight of the section steel, and increase the support density. In the future, due to the fact that quite a number of roadway surrounding rocks are relatively soft and affected by mining, especially with the development of coal mining mechanization, the depth of mine mining increases, the cross-sectional area of roadways increases, and the deformation of roadway surrounding rocks is severe. will increase year by year.

Compared with other roadway support methods, the U-shaped steel support in the metal support has its unique advantages: ①The support strength is high, and it has a relatively high bearing capacity for a reasonable support form; ②Wide adaptability , can meet the requirements of different geological conditions and mine pressure. When the pressure of surrounding rock reaches a certain value, the support will shrink, so that the pressure of surrounding rock acting on the support will drop, and avoid the instability and damage caused by excessive load;③ The installation is convenient and fast, which is conducive to mechanized construction; ④The number of times of use is high, although the one-time investment is high, but the overall cost is low; The surrounding rock of the roadway suddenly loses stability and falls, resulting in a sudden roof fall accident.

In view of the good cross-sectional shape and geometric parameters of U-shaped steel, the U-shaped steel shrinkable support processed by it can well adapt to the characteristics of large deformation and large ground pressure of surrounding rock, and has some incomparable advantages in roadway support. . The biggest advantage of the U-shaped steel shrinkable support is that when the pressure of the surrounding rock on the support reaches a certain value, the U-shaped steel support can realize the shrinkage of the section, adapt to the deformation of the surrounding rock, and relieve the pressure of the surrounding rock, thus avoiding the pressure of the surrounding rock greater than the bearing capacity of the bracket, resulting in damage to the bracket. The pressure support characteristic of the U-shaped steel bracket can protect itself from deformation and damage. Therefore, U-shaped steel brackets are widely used to support unstable roadways with large sections and large deformations. Foreign engineering practice has proved that the U-shaped steel shrinkable support is a better form of roadway support at present, and it is also widely used in European countries.

However, with the gradual extension of the mine, the use of U-steel metal supports in the high-stress soft rock roadway has been challenged. The common U-steel in the roadway suffers from yield deformation, and the section of the roadway is greatly reduced, which seriously affects the normal production of the mine. , the lives of employees were threatened. Because the erection of U-steel still relies on the manual erection of workers, the method of increasing the resistance of U-steel by increasing the cross-sectional area of U-steel becomes impossible due to the physical limitations of workers. How to improve the supporting capacity of U-steel has become an urgent problem to be solved.

Utility model content

The purpose of the utility model is to solve the above-mentioned technical problems existing in the prior art, and provide a retractable pillar for U-shaped shed support.

In order to achieve the above object, the technical scheme adopted by the utility model is as follows:

The retractable pillar for supporting a U-shaped shed of the utility model includes an upper pillar and a lower pillar connected by a clip cable, and a tray is arranged on the top of the upper pillar.

The upper column and the lower column are preferably U-shaped steel respectively.

The cable includes an upper splint and a lower splint, the upper splint and the lower splint are fastened by bolts, and reinforcing ribs are provided on the back of the upper splint and the lower splint.

The retractable point column of the utility model is applied to U-shaped shed support. When the roadway is pressed, the two-section column can withstand the pressure and sink slowly by relying on frictional resistance. The scalability of the column makes the column generate flexible resistance to the transmitted pressure, protecting It prevents the rigid damage of the pillars under huge pressure, reduces and slows down the deformation of the U-shaped shed beams, and maintains the shape of the roadway. It cannot change the pressure value of the U-shaped shed support, but it can enhance the overall load-bearing capacity of the support through self-adjustment, so that the force of the support is more uniform, and it is not easy to form a weak surface on the support, causing the support to be damaged. Destruction occurs in a local area, which eventually leads to the overall failure of the stent.

Description of drawings

Fig. 1 is a schematic diagram of the retractable pillar of the present invention applied to U-shaped shed support.

Fig. 2 is a structural schematic diagram of the card cable in the utility model.

Detailed ways

As shown in Figure 1, the U-shaped shed supporting retractable pillar of the present invention includes an upper column 2 and a lower column 3 connected by a clamp cable 4, and the top of the upper column 2 is provided with a U-shaped steel 5. Tray 1. The upper column and the lower column are respectively U-shaped steel.

The card cable 4 includes an upper card slot splint 4-1 and a lower card slot splint 4-2, the upper card slot splint and the lower card slot splint are fastened by bolts, on the back of the upper card slot splint and the lower card slot splint Be provided with reinforcing rib 4-3.

In this embodiment, the lower column is a U-shaped steel section with a length of 2 meters, and the upper column section is 1.0 meters long. It is fixed with two U-shaped clamping cables, the lap length is 0.4 meters, the distance between the two clamping cables is 0.2 meters, and the design height of the column is 2.6 meters. m, a section of channel steel welded on the top of the upper column is fully in contact with the top beam, and the U-shaped two-section column can be reused once put into use. When laying retractable pillars during construction, the erected pillars should be in full contact with the top joist, and firmly backed with a wooden wedge, and the pillars must have a 200mm hard socket, and the pillars must be fixed firmly to prevent loosening; when erecting the pillars, no less than 3 people work together, one person supports the lower section of the pillar, one person supports the upper section, and the other person fixes the pillar with a U-shaped cable until the torque of the cable nut reaches 200N.m~250N.m.

Claims (3)

1. A retractable pillar for U-shaped shed support, characterized in that: it includes an upper column and a lower column connected by a clamp cable, and a tray is provided on the top of the upper column. 2. The retractable pillar for U-shaped shed support according to claim 1, characterized in that: the upper pillar and the lower pillar are respectively U-shaped steel. 3. The retractable pillar for supporting a U-shaped shed according to claim 1 or 2, wherein the cable includes an upper splint and a lower splint, and an upper splint and a lower splint They are fastened by bolts, and reinforcing ribs are provided on the back of the upper splint and the lower splint.

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