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Simple shearing test method and device for rock-concrete cement face

A shear test and concrete technology, applied in the direction of measuring devices, mechanical devices, instruments, etc., can solve the problems of complex device structure, difficult operation, inaccurate data measurement, etc., and achieve simple appearance and structure, simple test operation, and high reliability. degree of effect

Inactive Publication Date: 2014-03-26
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Tongji University once proposed a field large-scale direct shear test device for the shear strength of the cemented surface of concrete and bedrock. This device is mainly used to measure the friction coefficient between the anchorage and bedrock of the suspension bridge on site. This device cannot perform shearing operations, and the field test device has defects such as complex structure, difficult operation, long test cycle, and unstable test data. Therefore, it is necessary to use indoor direct shear tests to verify the field test results.
Scientific research institutions such as Sichuan University and Hohai University have also proposed some simple devices for shear tests with pressure testing machines, but these devices are mainly for rock mass structural planes for shear tests, and the device structure is complex and the data measurement is not accurate enough. Unable to perform shear tests on rock-concrete bonded surfaces
[0004] In view of the fact that the shear strength of the indoor rock-concrete bonded surface has important guiding significance for practical engineering, especially the roughness of the rock mass on the bonded surface, the type of bedrock, and the strength grade of the concrete have a great influence on the shear strength of the bonded surface. The test regulations and national or departmental specifications have no clear regulations on this type of test, so the test device for the shear strength of rock and concrete is proposed

Method used

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  • Simple shearing test method and device for rock-concrete cement face
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  • Simple shearing test method and device for rock-concrete cement face

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Embodiment Construction

[0018] combine figure 2 and image 3 , The simple and simple shear test device includes: device base 1, connecting plate 2, force transmission screw 3, sensor 4, force transmission screw screw hole 5, base hole groove 9, strain rosette 10.

[0019] The base 1 of the device adopts a solid steel material of 169mm×100mm×47mm, and a φ49.8mm base hole 9 is opened at the right end of it for fixing the test piece. The left end is welded to the connecting plate 2, and the weld seam is ground and polished. An M16 bolt hole 5 is opened on the center of the connecting plate at a distance of 50 mm from the top of the plate, and the force transmission screw 3 passes through the bolt hole 5 and is centered with the sensor 4 to apply a shear load.

[0020] The sensor 4 is the main measuring part of this device. It is made of Q245 steel. Realize the seamless connection between the sensor and the outer edge of the test piece. The surface of the sensor should be ground and polished, and a ...

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Abstract

The invention relates to a simple shearing test method and device for a rock-concrete cement face. A to-be-detected rock-concrete cement test piece is vertically arranged, a horizontal shearing force is applied on the rock-concrete cement face through a power transmission screw rod, and maximum strain of a sensor during the shearing process is collected by the strain sensor arranged on the power transmission screw rod; the axial lines of the power transmission screw rod and the strain sensor are positioned on the same horizontal line, and a cambered surface attached to the power transmission screw rod is arranged at the bottom of the strain sensor. The device coordinates with a press to work, the axial load is applied through the press, the power transmission screw rod is screwed in to apply a shearing load to achieve the shearing of the rock-concrete cement surface, the operation is simple, and the use is convenient.

Description

technical field [0001] The invention relates to a device for a material testing machine, which belongs to the rock mechanics and geotechnical engineering test and test parts, and in particular discloses a shear test device for the cemented surface of rock and concrete, which can be used to test the shear strength of the cemented surface of two media . Background technique [0002] In the field of pile foundation engineering, the study of the friction characteristics between end-bearing pile body and bedrock rock surface has important guiding significance for the design of pile foundation. The shear failure of the cemented surface between concrete pile and rock mass is a common failure form. In the existing national and departmental codes, most of them only focus on the shear strength of the structural plane of the rock mass itself, and none of the codes explains the test device and implementation method of the shear strength of the rock-concrete bonded surface. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04
Inventor 崔凯薛爱黄邦文黄辉李欢欢杨烨
Owner SOUTHWEST JIAOTONG UNIV
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