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Testing box for measuring anti-pulling force of soil nailing mechanical property

A test box, pull-out force technology, applied in the direction of using stable tension/pressure test material strength, measuring device, using mechanical device, etc., can solve the problem of increasing water saturation, unable to measure soil nail stress, not having, etc. problem, to achieve the effect of increasing water saturation

Active Publication Date: 2006-05-17
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the existing pullout resistance test chamber does not have an effective means of increasing water saturation
Existing pullout resistance test box also has the following defects: (a) after starting to pull out, the stress acting on the soil nail is uneven
(b) Despite the use of carbon dioxide gas, it is difficult to achieve water saturation of the soil
(c) The stress on the soil nail cannot be measured

Method used

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  • Testing box for measuring anti-pulling force of soil nailing mechanical property
  • Testing box for measuring anti-pulling force of soil nailing mechanical property

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Embodiment Construction

[0024] like figure 1 and figure 2 Said, the pullout resistance test box 10 of the present invention comprises a test box main body 11, and this test box main body 11 is in the shape of a hollow cuboid, and its inside is filled with rock and soil samples 12, and this rock and soil samples can be completely decomposed flowers, for example. Granite rock and soil, that is, CDG rock and soil. The upper end of the main body 11 of the test box is open, and the opening is closed by a cover plate 30 . Below the cover plate 30 , a rubber water bag 31 is arranged on the surface of the rock-soil sample 12 , and the rubber water bag 31 exerts vertical pressure on the rock-soil sample 12 . First fill the rock soil sample 12 with carbon dioxide gas, fill the rock soil sample 12 with deaerated water, and then apply backwater pressure to the rock soil sample 12 in the box 11 through the rubber water bag 31 . Taking these measures will increase the water saturation of the soil sample 12, th...

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Abstract

The present invention relates to a pulling resistance testing box for earth nail. Said testing box includes the following several portions: a testing box main body with first additional chamber and second additional chamber, rock and soil sample, earth nail, an upper cover plate, a rubber water bag and a pulling force applying device. Said invention also provides the concrete structure and mounting mode of the above-mentioned every portion and the working principle of said testing box.

Description

technical field [0001] The invention relates to a test device used in the construction field, in particular to a pull-out resistance test box for measuring the mechanical properties of soil nails. Background technique [0002] According to statistics, there are at least 50,000 slopes in Hong Kong. At present, soil nails (a component of cement pouring steel bars) are commonly used to stabilize slopes. Engineers first use a drilling machine to drill holes on the slope, and then drive soil nails. A slope may require at least 100 holes drilled and hundreds of soil nails used. [0003] In addition, soil nails are also used for the foundation pit support of buildings. It makes full use of the strength of the soil itself. By setting soil nails composed of steel bars and other metal rods in the in-situ soil, it can share the external force and pressure on the soil. Self-weight, improve the stress of the soil, and build a reinforced mesh shotcrete surface on the excavation surface,...

Claims

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Application Information

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IPC IPC(8): G01N3/10G01N19/00G01N19/04
Inventor 殷建华
Owner THE HONG KONG POLYTECHNIC UNIV
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