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Construction method for mounting layer-divided sinking apparatus in deep compressible soil layer

A layered settlement and construction method technology, applied in the field of foundation soil survey, infrastructure engineering, construction, etc., can solve problems such as distortion of observation results, achieve the effects of avoiding settlement, ensuring durability, and expanding the scope of use

Active Publication Date: 2016-10-26
SICHUAN COLLEGE OF ARCHITECTURAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a construction that overcomes the limitation that the existing layered settlement instrument must be placed on the shallow bedrock during installation, and can install the layered settlement instrument in deep medium or low compressibility soil layers. method, this construction method can solve the problem of distortion of the observation results caused by the additional settlement of the layered settlement instrument due to its own weight, so that the layered settlement instrument can also obtain true Valid Observational Data

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  • Construction method for mounting layer-divided sinking apparatus in deep compressible soil layer
  • Construction method for mounting layer-divided sinking apparatus in deep compressible soil layer
  • Construction method for mounting layer-divided sinking apparatus in deep compressible soil layer

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Embodiment 1

[0056] The present embodiment is for further improving the method of the present invention, before carrying out described step (1), the specific content of preparatory work of adding earlier stage, preparatory work of early stage comprises collecting and installing the geological prospecting report of layered settlement instrument soil layer, and using The relevant technical parameters of the layered settlement instrument, and through no less than three groups of indoor tests, determine the cubic uniaxial compressive strength of the cement slurry standard test block.

[0057] Among them, it is necessary to collect geological survey reports and instrument manuals issued by instrument manufacturers, and to master the instrument size, total weight, soil side friction resistance qu, end resistance qp, soil compression modulus Esi measured by standard penetration tests, etc. Design parameters, no less than three sets of indoor tests, to determine the cubic uniaxial compressive stren...

Embodiment 2

[0064] In this embodiment, on the basis of the above embodiments, the process of grouting the borehole is further described in detail, including the following steps:

[0065] (2.1) According to the actual situation, design reasonable grouting construction parameters, and use the designed grouting construction parameters as the reference value for actual construction; among them, the specific grouting construction parameters are, use ordinary portland cement grout as grouting For grouting materials, the grouting pressure is not greater than 0.5MPa, the grouting water-cement ratio is 1:0.55, and the grouting speed is not greater than 50L / Min;

[0066] (2.2) Make and install the grouting device;

[0067] (2.3) Grouting into the borehole, when the corresponding design grouting parameters have been reached or approached, stop grouting;

[0068] (2.4) After the grouting is completed, recover the grouting device within 20 minutes. After 1 hour, lower the hammer measuring rope to mea...

Embodiment 3

[0081] On the basis of the above-mentioned embodiments, this embodiment further defines the structure of the grouting device, such as figure 2 As shown, the grouting device includes a pressure mud pump 201 and a grouting pipe 208, and the pressure mud pump 201 is provided with a grout inlet pipe 204 for extracting slurry from a slurry pool 209, and a grout outlet pipe communicated with the grout pipe 208, The grouting pipe 208 is placed in the borehole 210; the grouting pipe 204 is also provided with a flow meter 203, the grouting pipe is also provided with a pressure gauge 202, and the middle part of the grouting pipe is also provided with an inlet The slurry discharge pipe 205 of the slurry tank 209.

[0082] The grouting device also includes a tripod set up at the drilling hole, such as figure 2 , image 3 As shown, the tripod is hoisted with guiding steel bars 206, the guiding steel bars 206 are fixed with the grouting pipe 208 by at least two welded pipes 211, and the...

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Abstract

The present invention discloses a construction method for mounting a layer-divided sinking apparatus in a deep compressible soil layer. The construction method comprises the following steps: 1) carrying out pre-boring of a borehole and burying a protection casing; 2) carrying out slip casting to a lower segment of the borehole to form the lower segment into a short pile reinforced body; 3) pulling up the protection casing after completing the slip casting and mounting a layer-divided sinking apparatus in the borehole where the short pile reinforced body is formed; 4) after complete mounting, correcting the reading of the layer-divided sinking apparatus, and starting filling construction and observation three days later. The construction method provided by the present invention overcomes the limitation that a layer-divided sinking apparatus must be placed on shallow bedrock at present, and allows mounting of a layer-divided sinking apparatus in a deep medium compressible or low compressible soil layer; the construction method is capable of solving the problem of distortion of an observation result of the layer-divided sinking apparatus caused by additional settlement due to dead weight of the apparatus; thus, real and efficient observation data can also be obtained when the layer-divided sinking apparatus is used in the deep medium compressible or low compressible soil layer.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a construction method for installing layered settlement instruments in deep compressive soil layers. Background technique [0002] The layered settlement meter is a foundation test instrument, which is suitable for measuring the settlement of each layer under the foundation, foundation pit, embankment, etc. According to the test data changes, the settlement trend can be calculated, its stability can be analyzed, and the construction process can be monitored. Used in conjunction with a high-precision borehole inclinometer, it is an ideal equipment for in-situ monitoring of the foundation. [0003] The layered settlement instrument widely used in foundation soil layered settlement monitoring is a precision sensing device that uses the principle of electromagnetic induction to measure the displacement of rock and soil mass. It can be pre-buried through drilling and ca...

Claims

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Application Information

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IPC IPC(8): E02D1/00
CPCE02D1/00
Inventor 冯研马冰
Owner SICHUAN COLLEGE OF ARCHITECTURAL TECH
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