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Construction method of anchor rod with expanded head

A construction method and a technique of enlarging the head, which can be used in the installation of bolts, drilling equipment and methods, earthwork drilling and mining, etc., and can solve problems such as inapplicability

Inactive Publication Date: 2009-09-23
曾庆义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two methods are not suitable for formations that are not suitable for liquid injection and for formations and rocks with high hardness.

Method used

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  • Construction method of anchor rod with expanded head
  • Construction method of anchor rod with expanded head

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment one, a kind of construction method of enlarged head bolt, see figure 1 , the basic process steps are as follows:

[0025] Step 1: see figure 1 (a), the drilling machine 3 is used to drill holes, the diameter of the drill pipe 2 is 50 mm, the diameter of the common drill bit 1 is 110 mm, and the drilling diameter is 110 mm.

[0026] Step 2: After drilling to the position where the expansion head is to be set, replace the drill bit 1 with the eccentric drill bit 4. There are many ways to change, for example, the drill bit 1 can be withdrawn from the borehole, unloaded from the drill rod 2, and the eccentric drill bit 4 is installed on the drill rod 2. When the drill bit and the down-the-hole hammer are integrated as a whole, the drill bit can be disassembled or replaced as a whole. The equipment of some manufacturers is equipped with a top punch. According to the specific situation, the drill bit can be replaced or the top punch can be replaced together.

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Embodiment 2

[0031] Embodiment two, a kind of construction device of expanding head bolt, combine figure 1 and figure 2 , including drilling machine 3, drill pipe 2, common drill bit 1 and eccentric drill bit 4. The diameter of the eccentric drill bit 4 is substantially equal to that of the common drill bit 1. The axis 11 of the ordinary drill bit 1 coincides with the axis 12 of the drill rod 2 , and the axis 13 of the eccentric drill bit 4 deviates from the axis of the drill rod 2 . During construction, the ordinary drill bit 1 is used for drilling in the ordinary section designed for the bolt; when the designed expansion head section is reached, the ordinary drill bit 1 is replaced with the eccentric drill bit 4 for percussion drilling, and the lateral impact of the eccentric drill bit 4 is used to realize the expansion. hole drilled. In order to facilitate the removal of the eccentric drill bit 4 from the borehole and prevent the drill bit from being stuck at the position where the ...

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Abstract

The invention discloses a construction method of an anchor rod with an expanded head, which comprises the following steps of replacing a drill bit with an eccentric bit for percussion drilling when a drilling machine drills a hole to the position of an expanded head to be set, and utilizing the transverse impact action of the eccentric bit for realizing ream drilling, thus forming the expanded head.

Description

[technical field] [0001] The invention relates to a construction method of an enlarged head bolt, in particular to a method for using an eccentric drill bit to construct an enlarged head bolt. [Background technique] [0002] Anchor rods are widely used in foundation pit support, slope support, landslide control and building anti-floating engineering. The current bolt construction technology is generally to use a drilling rig (including various special bolt machines) to drill holes first, then put the bolt body into the hole, and then inject grout into the hole. After the grout solidifies, the bolt can bear the tension. . Anchor holes drilled with drilling rigs are generally cylindrical, with small diameters, small anchor pullout resistance, and large deformation. Expanding the head bolt is undoubtedly the best way to increase the pullout force and reduce the displacement. However, the realization of the expansion head is a difficult point. [0003] In order to achieve th...

Claims

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Application Information

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IPC IPC(8): E02D5/74E21D20/02E21B1/00
Inventor 曾庆义
Owner 曾庆义