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Preparation method of end-sealed prefabricated concrete enlarged head tubular pile

A technology of precast concrete and enlarged head, which is applied in the test of sheet pile walls, buildings, and foundation structures, etc., can solve the problems of not bearing the full cross-section, reducing the stability of steel plates, and not being an effective area, achieving low profile height, testing Convenient, good natural linear effect

Active Publication Date: 2020-05-12
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the welding process, the microstructure and mechanical properties of the steel plate will change due to the high temperature at the welding site and its vicinity, thus making the steel plate brittle
In addition, welding will produce residual stress, which will increase the possibility of residual stress in the steel plate and reduce the stability of the steel plate
Moreover, the pile tip resistance is an important part of the pile foundation bearing capacity. Since there are many factors affecting the pile sinking resistance during the pile sinking process, and there are many testing methods for testing the pile tip resistance, most of them are installed with earth pressure boxes and The axial force meter is tested, and the contact surface with the soil layer is the surface of the sensor, and the contact area is not the actual effective area of ​​the pile end, showing the phenomenon that the full section is not loaded, so that there is a gap between the measurement results and the actual working conditions of the pile foundation , so it is necessary to improve the method of testing pile end resistance

Method used

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  • Preparation method of end-sealed prefabricated concrete enlarged head tubular pile
  • Preparation method of end-sealed prefabricated concrete enlarged head tubular pile
  • Preparation method of end-sealed prefabricated concrete enlarged head tubular pile

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Experimental program
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Effect test

Embodiment

[0026] The specific process of preparing the end-sealed precast concrete enlarged head tubular pile in this embodiment is as follows:

[0027] (1) Pre-embed the nut 3 on the end plate of the prefabricated concrete pipe pile 1 pile end, and glue the hole of the nut 3 with tape on the upper and lower surfaces of the nut, so as to prevent the concrete from splashing on the thread and affecting the subsequent installation;

[0028] (2) In order to ensure that the expansion head 4 does not bend during the pile sinking process and the working stage, a certain thickness must be met, so the diameter of the expansion head 4 should be based on the diameter of the precast concrete pipe pile 1 and the characteristic value of the single pile bearing capacity and the expansion The thickness of the head plate is determined comprehensively, and the corresponding position is marked on the enlarged head 4 according to the pre-embedded nut 3 at the end of the precast concrete pipe pile 1, and the...

Embodiment 2

[0036] In this embodiment, the preparation of end-sealed prefabricated concrete enlarged head tubular piles and the pile end resistance test are carried out in a certain project. The project site mainly distributes muddy soil layers and cohesive soil layers. The soil layer distribution is shown in Table 1:

[0037] Table 1: Physical and mechanical property indexes of soil layer

[0038]

[0039] Where / : indicates that it is not given in the survey report;

[0040] End sealing prefabricated concrete enlarged head tubular pile (i.e. following expanded bottom pile) described in the present embodiment adopts the pile length of concrete tubular pile to be 10m, and pile diameter is 400mm, and wall thickness is 9.5mm, and the diameter of enlarged head is 500mm , the pile pressing method in this embodiment adopts the static pile pressing method, and the pile pressing force and penetration depth of the expanded bottom pile and the non-expanded bottom pile are compared, and the comp...

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Abstract

The invention belongs to the technical field of foundation engineering, and relates to a preparation method of an end part port sealing precast concrete expanding head tubular pile. Through changing aconnecting mode of an expanding head and a concrete pipe pile, the requirement of the end part port sealing precast concrete expanding head tubular pile for improving the bearing capacity in a mechanical aspect can be met, then the sedimentation of a pile body can be reduced, and the influence of high temperature and residual stress caused by welding can be avoided; and meanwhile, an installationprocess of an end part sensor is improved, a spoke sensor is installed at a pile end of the end part port sealing precast concrete tubular pile, the pile end resistance in a pile sinking process canbe measured; and the friction resistance of a pile side can be calculated according to a pile pressing force, and the change rule of a soil layer in the pile sinking process can be deduced through thepile end resistance and the pile side friction. The preparation method of the end part port sealing precast concrete expanding head tubular pile is simple, convenient to test, simple and convenient to install, high in mechanical degree and strong in field operability, pre-splicing is not needed, and the method is suitable for on-site installation in a piling process.

Description

Technical field: [0001] The invention belongs to the technical field of foundation engineering, and relates to a preparation method for end-sealed prefabricated concrete enlarged-head tubular piles, which are suitable for binary strata with upper softness and lower hardness, that is, the bearing layer is covered with a weak soil layer, and the bearing layer is covered with a soft soil layer. High bearing capacity (such as gravel, pebbles or weathered rock foundations), and can directly test the pile tip resistance during pile sinking. Background technique: [0002] Pile foundation technology is widely used in modern high-rise buildings and to ensure that soft soil foundations can bear large loads, especially prefabricated concrete tubular piles, which are characterized by stable quality, fast construction speed, short construction period, environmental protection, and can withstand large loads , solid and durable, factory-like production and other advantages, it has become t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00E02D5/30
CPCE02D5/30E02D33/00
Inventor 张明义白晓宇桑松魁张亚妹
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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