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Hollow grouting anchor rod with conical expansion head and construction method

A technology of grouting bolts and expanding heads, which is applied to the installation of bolts, earthwork drilling, mining equipment, etc., which can solve the problems of reduced construction efficiency, displacement, and falling of hollow bolts, and achieve the effect of improving construction efficiency

Active Publication Date: 2019-12-20
CHINA MCC17 GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional hollow radial anchors are not easy to hang, especially in the construction of the tunnel vault, the hollow anchors inserted into the anchor holes often fall and shift before or during the grouting, seriously It affects the effect of hollow bolt grouting to strengthen the rock mass, and leads to a great reduction in construction efficiency

Method used

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  • Hollow grouting anchor rod with conical expansion head and construction method
  • Hollow grouting anchor rod with conical expansion head and construction method
  • Hollow grouting anchor rod with conical expansion head and construction method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] like Figure 1 to Figure 4 As shown, a hollow grouting anchor 2 with a conical enlarged head includes a conical fixing part 1 and a hollow grouting anchor 2. 11 and cylindrical portion 12, the tapered portion 11 and the cylindrical portion 12 are provided with a cavity 13, the cylindrical portion 12 is provided with a first mounting groove 14 on the side wall and an internal thread 15 at the end , the first installation groove 14 is rotatably connected with the first stopper 16, and the hollow grouting anchor rod 2 is provided with several overflow holes 21, and the grouting function will be realized by utilizing the overflow holes 21. The front end of the hollow grouting anchor 2 is provided with a limit structure, the limit structure extends into the cavity 13 and matches with the first limiter 16, the hollow grouting anchor 2 is provided with an anchoring structure, the hollow grouting anchor 2 An anchor tray 22 and a locking member 23 are threadedly connected to th...

Embodiment 2

[0033] A construction method of a hollow grouting anchor with a conical enlarged head, comprising the following steps,

[0034] Step 1. Fix the drill rod and the internal thread 15 of the cylindrical part 12 of the tapered fixing part 1, drill out the bolt installation hole, and then take out the drill bit and leave the tapered fixing part 1 in the installation hole;

[0035] Step 2. Use high-pressure air to clear the hole, and do not use clean water to rinse;

[0036] Step 3: Insert one end of the hollow grouting anchor 2 with a limiting structure into the anchor installation hole until the second connecting rod 25 completely passes through the triangular limiter 17, and connect the hollow grouting anchor 2 to the anchor tray 22 and locking member 23;

[0037] Step 4: Adjust the locking member 23 and the anchor tray 22, pull out the hollow grouting anchor rod 2, drive the second connecting rod 25 in the limiting structure to squeeze the positioning groove 18 of the first lim...

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Abstract

The invention discloses a hollow grouting anchor rod with a conical expansion head and a construction method, and belongs to the field of tunnel anchor rod support construction. The hollow grouting anchor rod comprises a conical fixing part and a hollow grouting anchor rod body, wherein the conical fixing part comprises a conical part and a cylindrical part; cavities are formed in the conical partand the cylindrical part; a first installation groove is formed in the side wall of the cylindrical part, and an internal thread is positioned at the end part of the cylindrical part; a first limiting part is rotatably connected in the first installation groove; a grouting overflow hole is formed in the hollow grouting anchor rod body; a limiting structure is arranged at one end of the hollow grouting anchor rod body; the limiting structure extends into the cavities and is matched with the first limiting part; an anchoring structure is arranged on the hollow grouting anchor rod body; and theother end of the hollow grouting anchor rod body is in threaded connection with an anchor rod tray and a locking piece. According to the hollow grouting anchor rod with the conical expansion head, surrounding broken rock mass is effectively consolidated, the drawing force of the anchor rod meets requirements, the overall stability of the surrounding rock mass is enhanced, and the construction efficiency of the hollow system anchor rod can be improved.

Description

technical field [0001] The invention belongs to the field of tunnel bolt support construction, and in particular relates to a hollow grouting bolt with a conical expanding head and a construction method. Background technique [0002] The initial bolt support of the mountain tunnel is the core of the new Austrian tunnel lining, and the hollow grouting bolt technology can maintain the integrity and stability of the surrounding rock to the greatest extent, and can effectively control the deformation, displacement and crack development of the rock mass. Give full play to the supporting role of the surrounding rock itself. Especially when dealing with the structure of broken rock mass in karst landform, the stabilization effect is remarkable. However, the traditional hollow radial anchors are not easy to hang, especially in the construction of the tunnel vault, the hollow anchors inserted into the anchor holes often fall and shift before or during the grouting, seriously It aff...

Claims

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Application Information

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IPC IPC(8): E21D21/00E21D20/02
CPCE21D20/003E21D20/02E21D21/0026E21D21/008
Inventor 刘道兵刘旭正
Owner CHINA MCC17 GRP
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