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Reaction frame testing method for earth nail drawing tests

A pull-out test and test method technology, applied in the field of steel structural components, can solve the problem of spending a lot of time, and achieve the effect of ensuring vertical force, improving detection speed and detection quality

Active Publication Date: 2015-04-29
SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, soil nail testing is mostly carried out on walls with a certain slope. When there are a large number of soil nails, it takes a lot of time to adjust the bracket to make the soil nails and jacks coaxial to ensure the accuracy of the experimental results.

Method used

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  • Reaction frame testing method for earth nail drawing tests
  • Reaction frame testing method for earth nail drawing tests
  • Reaction frame testing method for earth nail drawing tests

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] This embodiment relates to a test method for a soil nail pull-out test reaction force frame, and the specific steps are as follows:

[0024] a) Fix the base 12 on the soil nail wall to ensure that the soil nail is located at the center of the base 12;

[0025] b) Set the load-bearing bracket 13 on the base 12, and adjust it by screw 4, screw 5, screw 6 and screw 7 to ensure that the load-bearing surface of the load-bearing bracket 13 is perpendicular to the axis of the soil nail;

[0026] c) Install a jack 11 on the longitudinal beam 9 of the force support 13 as a jack reaction system;

[0027] d) Use steel bars with sufficient tensile strength to extend the soil nails to a length that can be in contact with the jack 11, and start the pull-out test.

[0028] The facilities of the above test methods are installed as follows: figure 1 As shown, the base 12 is connected by the I-beam 1 and the I-beam 3 through the reinforcement 2, and the screw 4, the screw 5, the screw ...

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Abstract

The invention discloses a reaction frame testing method for earth nail drawing tests. The reaction frame testing method is realized through a reaction frame consisting of a base and a stress support. The base is connected with the stress support through screws, and a bearing surface of the stress support can be guaranteed to be coaxial with an earth nail by adjusting the screws. A jack is mounted on the stress support to form a jack reaction system. During testing, the earth nail can be fixed with the jack after being lengthened, and perpendicular stress is guaranteed by adjusting the screws. By adjusting the screws between the stress support and the support, stress surface on the wall at any gradient can be adjusted optionally, the perpendicular stress of the earth nail can be guaranteed, and testing speed and testing quality of the earth nail can be improved greatly.

Description

technical field [0001] The patent of the present invention belongs to the steel structure components, specifically refers to the ability to adjust the screw conveniently and freely on soil nail walls with different slopes, so that the force surface of the reaction force frame is perpendicular to the soil nail, and when the soil nail is pulled out, the soil nail A test method that can bear axial force and accurately measure the axial ultimate tensile force of soil nails. Background technique [0002] Soil nailing is an in-situ soil reinforcement technique. Its structure is a complex formed by the reinforcement rods (i.e. soil nails or anchors) set in the slope and the surrounding soil firmly bonded, and a support structure similar to a gravity retaining wall formed by the surface layer. It has the following advantages: 1) It can greatly reduce the cost of support, and generally saves a lot of costs compared with the pile wall support structure, and has significant economic b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00E02D17/20
Inventor 吴秀珍朱家文朱光远
Owner SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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