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Construction method and device for on-site water injection test

A technology of water injection test and construction method, applied in the field of exploration, can solve the problems of reduced data reliability, poor test accuracy, cumbersome operation, etc., and achieve the effects of high operation quality, fast construction speed and wide adaptability

Inactive Publication Date: 2010-10-13
SHANGHAI URBAN CONSTR DESIGN RES INST GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The airbag method has a good water-proof effect, but the operation is cumbersome, and the airbag material and lowering operation requirements are high, otherwise it is easy to be scratched
[0019] Generally speaking, the above-mentioned test method has many construction links and many controlled factors (such as construction technology, operation method, etc.), and has high requirements for the water injection test team, which is limited by factors such as the operation method and technical level of labor operators, resulting in The reliability of the measured data is reduced, and the test accuracy is poor

Method used

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  • Construction method and device for on-site water injection test
  • Construction method and device for on-site water injection test
  • Construction method and device for on-site water injection test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1: as figure 1 and figure 2 As shown, an on-site water injection test device includes a porous water seepage pipe 2 arranged in the protective pipe 3 .

[0058] The guide head 6 includes a connection end 61 connected to the seepage pipe 2 and a guide end 62 integral with the connection end 61; the connection end 61 is a cylinder, and the guide end 62 is a cone.

[0059] The far end 21 of the seepage pipe 2 from the guide head 6 is provided with a seepage pipe flange 1 along the direction close to the protective pipe 3; Flange 1 is fitted with protective tube flange 7.

[0060] The on-site water injection test device is made through the following steps: 1) connecting the porous water seepage pipe 2 with a conical guide 6; 2) putting the seepage pipe 2 into the protective pipe 3, and connecting the water seepage pipe 2 with the guide head 6 The connected end face 63 is limited; the protective tube 3 is connected with the sleeve (not shown in the figure).

[0...

Embodiment 2

[0067] Example 2: as Figure 5 and Image 6 As shown, in this embodiment, the structure of the on-site water injection test device is basically the same as that of Embodiment 1, the difference is: the water seepage pipe flange 1 is arranged at the end of the water seepage pipe 2, and the protective pipe flange 7 is arranged at the end of the protective pipe 3. The outer surface of the seepage pipe 2 is covered with a filter screen 4 ; the connecting end 61 of the guide head 6 and the seepage pipe 2 is provided with 6 sealing rings 5 ​​. The other structures of the field water injection test device in this embodiment are the same as those in Embodiment 1.

[0068] In this embodiment, the construction method of the field water injection test is basically the same as that of Embodiment 1, but as Figure 7 and Figure 8 As shown, the difference is: in step 1), it also includes the step of setting 6 sealing rings 5 ​​at the connection part of the guide head 6 and the seepage pip...

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Abstract

The invention discloses a construction method for an on-site water injection test, which comprises the following steps: 1) connecting a porous water infiltration pipe with a guide head; 2) placing the water infiltration pipe in a protective pipe, and limiting the position by using the end surface for connecting the guide head and the water infiltration pipe; and connecting the protective pipe with a sleeve pipe; 3) pressing the sleeve pipe downwards in a static pressure mode until the guide head is pressed into the bottom of the test section of a soil layer to be tested; 4) injecting water in the sleeve pipe; and raising the sleeve pipe to expose the water infiltration pipe out of the protective pipe; 5) standing, and starting the water injection test after the creepage of the disturbed soil in a seepage section is basically stable; and 6) after the water injection test is completed, taking out the sleeve pipe, the protective pipe, the water infiltration pipe and the guide head. The invention also relates to a device for the on-site water injection test, which comprises the porous water infiltration pipe, wherein the water infiltration pipe is arranged in the protective pipe; the lower part of the water infiltration pipe is fixedly connected with the guide head; and the guide head is provided with a bearing surface for bearing the protective pipe. The invention has the advantages of wide application range, simple operation, high operation quality, good water insulation effect and lower cost.

Description

technical field [0001] The invention relates to the technical field of exploration, in particular to a construction method for on-site water injection test and a device capable of realizing the method. Background technique [0002] With the rapid development of urban construction, more and more deep foundation pit projects are involved in engineering construction, such as rail transit underground stations, high-rise building basements, and underground garages. In the process of deep foundation pit design and construction, the occurrence of foundation pit instability accidents is often related to groundwater. The permeability coefficient is an important parameter for calculating the seepage stability of deep foundation pits and the design of foundation pit dewatering. At present, the permeability coefficient is measured by methods such as indoor permeability test and field permeability test. The indoor permeability test is limited by factors such as the quality of the borrow...

Claims

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Application Information

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IPC IPC(8): E02D1/00
Inventor 沈日庚张正发赵玉花沈文苑
Owner SHANGHAI URBAN CONSTR DESIGN RES INST GRP CO LTD