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A device and method for greatly increasing pullout resistance in soil layer anchorage

A technology of pullout resistance and anchorage, which is applied in construction, foundation structure engineering, sheet pile walls, etc., can solve the problems of sliding between the anchor rod and the anchor body, so as to improve the pullout resistance and support effect of the anchor rod, and reduce the contact Probability of water and air, effect of improving pullout resistance

Active Publication Date: 2018-12-21
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a device and method for greatly increasing the pull-out resistance in soil layer anchoring, which can solve the problem of sliding between the anchor rod and the anchor body during the support process of conventional anchor rods, and greatly improve the anchor rod resistance. Pulling force and support effect, and simple structure, easy to obtain materials, easy to operate, greatly saving test cost and cycle

Method used

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  • A device and method for greatly increasing pullout resistance in soil layer anchorage
  • A device and method for greatly increasing pullout resistance in soil layer anchorage
  • A device and method for greatly increasing pullout resistance in soil layer anchorage

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Such as figure 1 Shown, a kind of device that greatly improves pullout resistance in the anchorage of soil layer comprises the anchor rod 1 that has rigid disk 8 (preferably iron disk) at the bottom that is placed in anchor hole 5, and rigid disk 8 is placed on At the bottom of the anchor hole 5, the inner space of the anchor hole 5 on the rigid disc 8 is respectively poured with

[0059] The first expansive cement layer 7, the second expansive cement layer 6, the third expansive cement layer 3,

[0060] The amount of expansion agent X in the expansive cement slurry used in the first expansive cement layer 7 1 = 20%;

[0061] The expansion agent dosage X in the expansive cement slurry used in the second expansive cement layer 6 2 = 15%;

[0062] The expansion agent dosage X in the expansive cement slurry used in the third expansive cement layer 3 3 = 10%;

[0063] The amount of expansion agent Xn = expansion agent quality / (expansion agent quality + cement qualit...

Embodiment 2

[0068] A method for greatly improving the pull-out resistance by using the device described in Embodiment 1 to form a multi-layer expansion head, the method includes the following steps:

[0069] Step 1: Select a stable supporting slope, remove the debris on the surface and dig out the soft soil layer on the surface;

[0070] Step 2: drilling: drilling on the support slope to form the anchor hole 5, the height of the anchor hole is 1.5 meters, and the diameter is 6 cm;

[0071] Step 3: Make the anchor rod 1 with the rigid disk 8 at the bottom, the length of the anchor rod 1 is 1.8 meters, and the outer diameter is 22 mm;

[0072] Step 4: Prepare expansive cement slurry with different expansion agent content Xn, n=1, 2, 3...N, X 1 = 20%, X 2 = 15%, X 3 = 10%;

[0073] The preparation method is as follows:

[0074] Prepare expansive cement slurry with expansion agent content of 10%, 15%, and 20% and cement slurry without expansion agent, that is, take ordinary portland ceme...

Embodiment 3

[0079] The device installed in embodiment two is carried out pressure test and pull-out force pull-out test,

[0080] Paste the strain gages on the anchor rod 1 before putting the anchor rod 1 into the anchor hole: paste the strain gauges at equal intervals (10 cm) according to the length of the anchor section l, weld the lead wires of the strain gauges to the wires with tin soldering, and apply 704 sealing glue , and wrap it with insulating tape, and finally measure the resistance of the strain gauge (generally 120 ohms) to check the sticking effect of the strain gauge, and fix the strain gauge and the connecting wire on the anchor rod body with insulating tape so that it can be connected with the anchor rod 1 together. Put it in the anchor hole 5.

[0081] After all the grouting is completed, use the pressure acquisition system to carry out a pressure test on the installed device, that is, to test the change of the expansion pressure from the initial setting of the expansion...

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Abstract

The invention provides a device and a method for substantially increasing pulling resistance during soil layer anchoring. The device comprises an anchor rod arranged in an anchor hole; a rigid disc is arranged at the bottom of the anchor rod and is placed at the bottom of the anchor hole; a first expansive cement layer, a second expansive cement layer, a third expansive cement layer...an Nth expansive cement layer are poured in the inner space of the anchor hole above the rigid disc from bottom to top, and N is larger than or equal to 2; the mixing amount X1 of an expanding agent in expansive cement slurry adopted by the first expansive cement layer is smaller than or equal to 35%; the mixing amount Xn of an expanding agent in expansive cement slurry adopted by the Nth expansive cement layer is larger than 0; and a cement layer is poured at the top end of the Nth expansive cement layer. With the device and the method, the problem of sliding of the conventional anchor rod and an anchored body during support can be solved, the pulling resistance and the supporting effect of the anchor rod can be substantially improved, the structure is simple, materials are easy to obtain, the device is easy to operate, the test cost is substantially reduced, and the period is substantially shortened.

Description

technical field [0001] The invention relates to the field of soil layer anchoring, in particular to a device and method for greatly improving the pullout resistance in soil layer anchoring. Background technique [0002] Soil layer anchoring technology originated in the 20th century. At the Seventh International Conference on Soil Mechanics and Foundation Engineering held in Mexico in 1969, soil layer anchoring technology was used as a separate discussion topic. [0003] After the 1970s, many regional international conferences were held, and the experience and research related to the bolt technology were introduced. At present, the experimental and theoretical research of bolt technology is still in continuous development. Since the 1980s, Sweden, Germany, the United States, the United Kingdom, Japan and other countries have developed various types of bolt construction tools and grouting techniques, and each country has also formulated technical regulations for bolt design a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/74
CPCE02D5/74
Inventor 刘杰兰俊寇银盔张罗送高进李杨马涤尘程振东燕波利文森
Owner CHINA THREE GORGES UNIV
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