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Method for testing pulling resistance of anchor heads of reamed self-locking anchor rods

A technology of self-locking anchor rods and testing methods, which is applied in the testing of mechanical components, testing of machine/structural components, and measuring devices. It can solve problems such as the lack of unified standards, prevent slippage damage, and save slurry. The effect of the amount of material perfusion

Inactive Publication Date: 2020-01-07
WUDA JUCHENG STRUCTURE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There is no unified standard for the pull-out test of reaming self-locking bolts

Method used

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  • Method for testing pulling resistance of anchor heads of reamed self-locking anchor rods
  • Method for testing pulling resistance of anchor heads of reamed self-locking anchor rods
  • Method for testing pulling resistance of anchor heads of reamed self-locking anchor rods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as figure 1 As shown, the reaming self-locking anchor head pullout test method of the present embodiment includes the following steps,

[0041] S1, drilling, using a drilling tool to drill a circular hole 1 with a diameter d on the surface of the concrete substrate, and then cleaning the circular hole 1 . Specifically, the concrete base material is selected according to a specific structure, and a concrete layer is generally used. Specifically, generally, the surface of the concrete substrate is selected first, and then the circular hole 1 is drilled in a direction perpendicular to the concrete layer. The diameter of the circular hole 1 is selected according to the diameter of the reaming self-locking bolt body. In this embodiment, the diameter of the reaming self-locking bolt body is d 0 , the diameter d of the round hole 1 and the diameter d of the reaming self-locking bolt body 0 The relation is d=(d 0 +4mm)~(d 0 +6mm).

[0042] S2, reaming, insert the rea...

Embodiment 2～ Embodiment 10

[0048] This embodiment is basically the same as Embodiment 1, except that the diameter d of the round hole 1 and the maximum diameter D of the tapered hole 2 are different or the grouting height h is different.

[0049] The pullout test failure results of different embodiments of table 1

[0050]

[0051] It can be seen from Table 1 that by setting the reaming hole and forming a mechanical self-locking between the anchor heads between the tapered holes, the anchor rod can be prevented from being pulled out. The base material forms two types of cone damage, which meets the pull-out test requirements of the reaming self-locking bolt anchor head, and prevents slip damage results;

[0052] When the relationship between the maximum diameter D of the tapered hole and the diameter d of the round hole is D=(1.8~2.2)*d, it is guaranteed that the anchor rod will not be pulled out of the concrete structure;

[0053] When the grouting height h=(4~6)*d, it is guaranteed that the anchor...

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Abstract

The invention discloses a method for testing pulling resistance of anchor heads of reamed self-locking anchor rods. According to the method, reaming is carried out, and the anchor heads is arranged between conical holes to form mechanical self-locking, so that the anchor rods can be prevented from being pulled out, the final destruction result is that only the reamed self-locking anchor rods are broken due to pulling or the reamed self-locking anchor rods and the concrete bases form cone destruction, the pulling resistance test requirements of the anchor heads of the reamed self-locking anchorrods are satisfied, and the anchor rods are prevented from being pulled out from the concrete bases; through repeated tests, the grouting height is determined, so that the anchor rods are prevented from being pulled out from the concrete bases and the grouting amount i saved at the same time; and the anchor rods are not pulled out, only the axial tensile force is measured, and the displacement value does not need to be measured, so that the operation is simpler and more convenient.

Description

technical field [0001] The invention relates to the technical field of reaming self-locking bolts, in particular to a method for testing the pullout resistance of a reaming self-locking bolt head. Background technique [0002] The current anchor pullout test generally includes four steps: (1) drilling, drilling vertically on the surface of the concrete substrate, and cleaning up the sediment; (2) assembling and placing the anchor body, placing the anchor in the center of the borehole (3) grouting, inject slurry into the gap between the anchor rod body and the drill hole through the grouting pipe to form an anchor; (4) tension and lock, install the reaction beam, and apply a shaft Pull in the direction and maintain it for a certain period of time, and then unload to the locked load for locking operation. [0003] During the bolt pullout test, there are three possible failure outcomes: [0004] (1) The anchor rod is pulled out along the drilling channel; [0005] (2) The an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 高作平周剑波陈明祥廖杰洪
Owner WUDA JUCHENG STRUCTURE CO LTD