CN204267057U - A kind of nested type pipe seam anchor bar - Google Patents

Abstract

The utility model discloses a nested pipe seam anchor, which mainly includes a peripheral pipe seam anchor (hereinafter referred to as the peripheral anchor), an embedded pipe seam anchor (hereinafter referred to as the embedded anchor) and an embedded anchor The rod tray consists of three parts; when in use, first drive the outer anchor rod into the anchor rod hole through the bolt drill, and make the end sink into the drill hole; install the tray on the embedded anchor rod body, and then use the drill to drive it into the outer periphery The inner shell of the anchor rod; continue to push the embedded anchor rod so that the tray is in close contact with the surface of the coal and rock mass, and the installation is completed. The utility model increases the full-length anchoring force of the single pipe seam bolt support, and at the same time enhances the shear and tensile strength of the single pipe seam bolt support, and further improves and improves the pipe seam bolt support. The anchoring effect of the anchor rod has certain practical value.

Description

A nested pipe seam anchor

technical field

The utility model relates to a nested pipe seam bolt, which can be conveniently applied to surrounding rock support in geotechnical engineering.

Background technique

Slotted bolt is an existing bolt type for full-length anchoring and active reinforcement of surrounding rock. The main part of the pipe-slot bolt is a high-strength steel pipe with longitudinal slits. When installed in a borehole slightly smaller than the diameter of the pipe, it can immediately exert radial pressure on the hole wall and prevent the surrounding rock from The frictional force of the deformation, together with the supporting force of the anchor tray, makes the surrounding rock in a three-dimensional stress state, and when the surrounding rock is significantly displaced, the anchor does not lose its support resistance.

However, the known pipe-slot bolt also has disadvantages in support, such as low anchoring force, and it is not suitable for application in rock strata roadways where faults and cracks are developed and coal and rock masses are easy to expand. Currently known measures to increase the anchoring force of the pipe-slot bolt include: (1) reducing the borehole diameter; (2) lengthening the length of the pipe-slot bolt; aperture ratio. However, the implementation of these measures will increase the difficulty of anchor rod installation, and the increase in anchoring force is limited. There is a patent for "seam anchor" (patent authorization number CN201292856Y). The specific implementation plan is: install the seam anchor with the steel strip welded at the anchor head in the anchor hole, and then install the welded steel strip in the anchor hole. Install the cement roll within the effective length, install the supporting plate at the end and fix the supporting plate with the connecting piece. This patent only increases the anchoring force at the anchor head part of the pipe seam anchor, but does not increase the anchoring force at the pipe seam part.

It can be seen that the existing slit-type bolt remains to be further improved and developed.

Utility model content

Aiming at the technical problems existing in the existing pipe-seam anchor, the utility model provides a nested pipe-seam anchor, which increases the full-length anchoring force of the pipe-seam anchor, and at the same time enhances the bolt's resistance The shear and tensile strength have further enhanced and improved the anchoring effect of the pipe-seam bolt, the effect is obvious, and it has good practicability.

In order to achieve the above object, the utility model adopts the following technical solutions:

A nested pipe-seam anchor. Firstly, the peripheral pipe-seam anchor (hereinafter referred to as the peripheral anchor) is driven into the bolt hole, and then the embedded pipe-seam anchor (hereinafter referred to as the embedded anchor) is set The upper tray is driven into the inner shell of the peripheral seam anchor to form a nested seam anchor.

Preferably, the diameter of the bolt hole in the rock formation = (0.9-0.95) × the diameter of the outer bolt, the depth of the anchor hole = the length of the outer bolt + 100mm; the diameter of the anchor hole in the coal seam = (0.9-1.00) × the outer Anchor diameter, anchor drilling depth = peripheral anchor length + 200mm.

Further, the length of the embedded slit-type anchor is 3/4 of the length of the peripheral slit-type anchor, and the diameter of the embedded anchor is 3 mm larger than the diameter of the peripheral anchor.

Furthermore, the outer bolts must be completely driven into the borehole, and the embedded anchors must also be completely driven into the outer bolts to ensure that the embedded anchor trays are tightly attached to the coal and rock walls.

The beneficial technical effect of the utility model is:

Since the two slit-type bolts are nested and driven into the borehole one after another, the relative extrusion force between the bolt and the wall of the borehole is increased, that is, the friction between the bolt and the wall of the borehole is increased, so that Its full-length anchoring force has been greatly increased, resulting in a better support effect; under the action of mutual extrusion force, the nested anchors are combined into an anchor support body, which enhances the shear and anti-shear resistance of the anchor. Tensile strength, extending the service life of the anchor.

Description of drawings

Fig. 1 adopts the utility model to carry out the schematic diagram of the longitudinal section of the anchor rod drilling;

Figure 2 is a cross-sectional view of A-A in Figure 1, that is, a cross-sectional view of the nested anchor body;

Among them, 1—drilling hole, 2—peripheral slotted bolt, 3—inner shell of peripheral bolt, 4—inlaid pipe slotted bolt, 5—coal rock mass, 6—tray, 7—bolt retaining ring .

Detailed ways

The utility model provides a nested pipe seam anchor rod. In order to make the purpose, technical solution and advantages of the utility model clearer and clearer, the utility model will be further detailed for coal seam support in combination with the accompanying drawings and embodiments below. illustrate.

A nested pipe joint anchor comprises a peripheral anchor 2 , an embedded anchor 4 and an embedded anchor tray 6 .

The specific installation method is as follows:

(1) Determine the position of the bolt hole according to the design requirements, drill hole 1 with a drilling rig, and blow off the rock dust in hole 1 with compressed air;

(2) Drive the peripheral anchor rod 2 into the drill hole 1 with a percussion drill, and make its end sink into the drill hole 1;

(3) Install the tray 6 on the body of the embedded anchor rod 4, and then drive it into the inner shell 3 of the peripheral anchor rod 2 with a drilling machine;

(4) Continue to push the embedded anchor rod 4 so that the tray 6 is in close contact with the surface of the coal rock mass 5 to complete the installation.

The diameter of the outer anchor rod is 43mm, the diameter of the borehole is 43mm×0.95=41mm, the length of the anchor rod is 2000mm, and the length of the borehole is 2200mm; the diameter of the embedded anchor rod is 40mm, and the length of the anchor rod is 1500mm.

The tail of the outer bolt must be submerged into the borehole so that the embedded bolt tray can be smoothly attached to the coal rock wall.

It should be understood that the above-mentioned descriptions for the preferred embodiments are relatively detailed, and cannot therefore be considered as limiting the protection scope of the patent for the utility model. Under the protection scope of the new claims, various modifications such as replacement and simple combination can also be made, and these all fall within the protection scope of the present utility model. allow.

Claims (4)

1. a nested type pipe seam anchor bar, is characterized in that: first peripheral pipe-seam type anchor rod (2) is squeezed into armature boring (1), then by embedded pipe-seam type anchor rod (4) cover top tray (6), squeezes into peripheral anchor pole inner casing (3), forms nested type pipe seam anchor bar.

2. according to a kind of nested type pipe seam anchor bar described in claim 1, it is characterized in that: armature boring diameter=(0.9 ~ 0.95) × peripheral bolt diameter in rock stratum, the armature boring degree of depth=peripheral rock-bolt length+100mm; Armature boring diameter in coal seam=(0.9 ~ 1.00) × peripheral bolt diameter, the armature boring degree of depth=peripheral rock-bolt length+200mm.

3. according to a kind of nested type pipe seam anchor bar described in claim 1, it is characterized in that: peripheral anchor pole (2) afterbody must submerge boring (1), with make embedded anchor rod pallet board (6) can smoothly and coal petrography wall (5) be adjacent to.

4. according to a kind of nested type pipe seam anchor bar described in claim 1, it is characterized in that: consider deviation proportion when peripheral anchor pole (2) is installed, the length of embedded anchor pole (4) is 3/4 of peripheral anchor pole (2), embedded anchor pole (4) external diameter 3mm larger than peripheral anchor pole (2) external diameter.