CN205532656U - Deep well weak surrounding rock roadway support device - Google Patents

Abstract

The utility model discloses a roadway support device for weak surrounding rocks in deep wells, which includes a first support device and a second support device, the first support device includes a sprayed concrete layer, a steel mesh and a short anchor rod, The entire section of the roadway is sprayed with a primary sprayed concrete layer, and the outer layer of the primary sprayed concrete layer is laid with steel mesh, and the short anchor rod is connected and fixed on the surrounding rock of the entire section of the roadway; the second support device includes the re-sprayed concrete layer, long anchor rods and anchor cables , the outer layer of the reinforced mesh of the full-section of the roadway is sprayed and re-sprayed concrete layer, and the surrounding rock of the full-section of the roadway is connected and fixed with long anchor rods and anchor cables. The utility model can effectively control the deformation of the surrounding rock, maintain the integrity of the roadway, reduce the repair rate of the roadway, prolong the service life of the roadway, reduce the amount of anchor bolts, and reduce the cost.

Description

A roadway support device for deep wells with weak surrounding rocks

technical field

The utility model relates to a roadway supporting device, in particular to a roadway supporting device for deep wells with weak surrounding rocks.

Background technique

With the continuous high-intensity mining of coal in my country, especially in the eastern region, coal mining has gradually shifted from shallow to deep. One of the prerequisites for safe and efficient mining of deep coal resources is that underground roadways can be effectively and reliably supported. Under the condition of high-stress surrounding rock in deep mine roadway, the surrounding rock damage range is large, the mine pressure is obvious, the support body is easily damaged, and the roadway maintenance problem is becoming more and more prominent.

At present, the support method for the weak and broken surrounding rock roadway in deep wells mainly adopts the primary support method of long bolts, steel mesh, shotcrete, and anchor cables, but the primary support is not conducive to releasing the surrounding rock pressure. The roadway is easily deformed, causing damage to the existing support; at the same time, all use long bolts, which consumes a lot of materials.

Utility model content

In order to make up for the deficiencies of the prior art, the utility model provides a deep well weak surrounding rock roadway support device with good support effect and low support cost.

The utility model is achieved through the following technical solutions:

A supporting device for a roadway with weak surrounding rocks in a deep well. Anchor bolts, the full section of the roadway is sprayed with a primary shotcrete layer, and the outer layer of the primary shotcrete layer is laid with steel mesh, and the short anchor rods are connected and fixed on the surrounding rock of the full section of the roadway; the second supporting device includes a resprayed concrete layer, a long Anchor rods and anchor cables, sprayed and resprayed concrete layer on the outer layer of the full-section steel mesh of the roadway, and connected and fixed long anchor rods and anchor cables on the surrounding rock of the full-section of the roadway.

In the roadway supporting device for weak surrounding rocks in deep wells of the present utility model, the short anchor rod passes through the initial sprayed concrete layer and enters the broken zone of the surrounding rocks, which can seal the surrounding rocks in time, exert the bearing capacity of the surrounding rocks itself, and allow moderate deformation of the roadway; The long bolt passes through the re-sprayed concrete layer, the primary shotcrete layer and the broken zone of the surrounding rock into the plastic zone of the surrounding rock in order to increase the support strength, and the anchor cable enters the deep stable surrounding rock to apply prestress and control the deformation of the surrounding rock.

Furthermore, in the roadway support device for deep wells with weak surrounding rocks of the present utility model, the short bolts and long bolts are arranged in a quincunx shape and arranged in a staggered manner, which effectively reduces the amount of bolts used.

The beneficial effects of the utility model are:

(1) The first support device of this utility model can fully mobilize the bearing capacity of the shallow surrounding rock, so that it can form a reasonable load-bearing arch structure, allow certain deformation of the roadway, effectively release the stress of the surrounding rock, and reduce the support resistance . The long anchor rod of the second support device passes through the broken zone and enters the plastic zone. The anchor cable is connected with the deep surrounding rock mass, which can effectively control the deformation of the surrounding rock, maintain the integrity of the roadway, reduce the repair rate of the roadway, and prolong the service life of the roadway .

(2) The first support and the second support of the utility model adopt short anchor rods and long anchor rods respectively, and the arrangement of anchor rods adopts a quincunx shape, which can effectively reduce the amount of anchor rods.

(3) The supporting device of the present utility model has the advantages of simple technological process, fast construction speed, safety and reliability, and low cost.

Description of drawings

Accompanying drawing 1 is the structural representation of the utility model.

In the figure, 1 short anchor rod, 2 long anchor rod, 3 anchor cable, 4 primary shotcrete layer, 5 steel mesh, 6 re-sprayed concrete layer.

detailed description

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Accompanying drawing is a kind of embodiment of the utility model. This embodiment includes the first support device and the second support device, and the first support device includes the primary sprayed concrete layer 4, the steel mesh 5 and the short anchor rod 1, and the entire section of the roadway is sprayed with the primary sprayed concrete Layer 4, the outer layer of the initial sprayed concrete layer 4 is laid with steel mesh 5, and the short anchor rod 1 is connected and fixed on the surrounding rock of the full section of the roadway, and the short anchor rod 1 passes through the initial sprayed concrete layer 4 and enters the broken zone of the surrounding rock; the second The support device includes the re-sprayed concrete layer 6, the long anchor rod 2 and the anchor cable 3, the full-section steel mesh 5 of the roadway, and the sprayed re-sprayed concrete layer 6 on the outer layer, and the long anchor rod 2 and the anchor cable 3 are connected and fixed on the surrounding rock of the full-section of the roadway , the long bolt passes through the re-sprayed concrete layer 6, the primary shotcrete layer 4 and the surrounding rock fracture zone in turn and enters the surrounding rock plastic zone.

In this embodiment, the short anchor rod 1 uses Φ22mm threaded steel anchor rod, the length is 1800mm, and each anchor rod uses 3 volumes of K2350 resin anchoring agent, and the spacing between the short anchor rods is 1000 mm×1000 mm; the diameter of the steel mesh 5 is Φ6mm, and the grid 100 mm×100 mm; the long anchor rod 2 is made of Φ22mm threaded steel anchor rod, the length is 2500 mm, and the distance between the two long anchor rods is 1000 mm×1000 mm; the anchor cable 3 is made of Φ17.8mm 8m steel strand, and the anchor cable The row spacing of the three rooms is 2000 mm×2000 mm; the short anchor rods 1 and the long anchor rods 2 are arranged in a quincunx shape and arranged in a staggered manner.

During the implementation of this embodiment, first, the roadway is supported for the first time after excavating according to the excavation section, spraying a layer of 50mm thick primary shotcrete layer 4, laying steel mesh 5, and then installing short anchor rods 1, followed by roof anchors. In the order of rods, side anchors and bottom corner anchors, the eye position of the short anchor is given according to the row spacing of 1000 mm×1000 mm, the anchor hole is drilled, and the short anchor 1 with a length of 1800mm is installed; When the deformation is certain and the surrounding rock is not yet unstable, the second support should be carried out in time, and the 100mm thick re-sprayed concrete layer 6 should be sprayed, and then the long anchor 2 should be installed, in the order of roof anchor, side anchor and bottom corner anchor. According to the row spacing of 1000 mm × 1000 mm, it is arranged in a quincunx-shaped staggered arrangement with the anchor eye positions of the primary support. Drill the anchor holes at the given anchor eye positions and install the long anchor rod 2 with a length of 2500 mm. At the same time Leave a place for the anchor hole. A certain distance behind the installation position of the long anchor rod 2, use an anchor cable drill to drill the anchor cable hole, and install the anchor cable 3 with a length of 8m.

There is a time interval between the first support and the second support. When the roadway is deformed to a certain extent and the surrounding rock is not yet unstable, the second support is adopted in time. The change of support parameters and support materials will not cause complicated construction.

Claims (3)

1. A roadway support device for deep well weak surrounding rocks, characterized in that: it includes a first support device and a second support device, and the first support device includes a shotcrete layer (4), a steel bar Mesh (5) and short bolts (1), the entire section of the roadway is sprayed with a shotcrete layer (4), the outer layer of the shotcrete layer (4) is laid with steel mesh (5), and the whole section of the roadway is connected and fixed on the surrounding rock. Anchor rod (1); the second support device includes re-sprayed concrete layer (6), long anchor rod (2) and anchor cable (3), and the outer layer of the roadway full-section steel mesh (5) is sprayed with re-sprayed concrete layer (6), connect and fix the long anchor rod (2) and the anchor cable (3) on the surrounding rock of the full section of the roadway. 2. A deep well weak surrounding rock roadway support device according to claim 1, characterized in that: the short anchor rod (1) passes through the primary sprayed concrete layer (4) and enters the surrounding rock fracture zone, and the long The bolt passes through the re-sprayed concrete layer (6), the primary sprayed concrete layer (4) and the broken zone of the surrounding rock in sequence and enters the plastic zone of the surrounding rock. 3. The roadway support device for deep well weak surrounding rocks according to claim 1 or 2, characterized in that: the short anchor rods (1) and long anchor rods (2) are arranged in a quincunx-shaped staggered arrangement.