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Method for detecting reinforcing bar cage length of concrete pouring pile by electric logging method

A detection method and cast-in-place pile technology are applied in the direction of using electrical devices, electromagnetic means, sheet pile walls, etc., which can solve problems such as promotion and application, and can not solve the problem of steel cage length detection, and achieve low detection costs. , The method is intuitive and simple, the principle is clear and reliable

Active Publication Date: 2009-07-29
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitations of the method technology and the instrument itself, these methods can not solve the problem of steel cage length detection well, let alone popularize and apply.

Method used

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  • Method for detecting reinforcing bar cage length of concrete pouring pile by electric logging method
  • Method for detecting reinforcing bar cage length of concrete pouring pile by electric logging method
  • Method for detecting reinforcing bar cage length of concrete pouring pile by electric logging method

Examples

Experimental program
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Effect test

Embodiment Construction

[0030] Figure 2-A shows the No. 1 cast-in-place pile (the unit in the figure is mm) with a diameter of 1m and a length of 16m. See Table 1 for the condition of No. 1 cast-in-place pile.

[0031] Figure 2-B shows the No. 2 cast-in-place pile with a diameter of 1m and a length of 18.6m (the unit in the figure is mm). The situation of No. 2 cast-in-place pile is shown in Table 2.

[0032] Table 1 No. 1 cast-in-place pile condition table

[0033]

part

pile length

Length of reinforcement cage in pile

(m) Condition of steel cage in pile

Upper section

8

8

The main bar 12 is 24 HRB335 steel bars with a diameter of Φ16;

The reinforcing bar 14 is HRB335 steel bar with a diameter of Φ16 and a spacing of 2m;

The spiral rib 13 is HPB235 with a diameter of Φ8 and a spacing of 0.2m

rebar lower paragraph 8 0 No rebar cage, consisting of concrete

[0034] Table 2 No. 2 cast-in-place ...

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Abstract

The invention discloses a method for detecting the length of a reinforcement cage in a concrete cast-in-situ pile by using an electric logging method. The method is to drill a hole (10) parallel to the cast-in-situ pile in or beside the pile that has been formed. ), utilize the electrical logging instrument (7) to test the variation of potential or potential difference along the drilling depth direction under the condition of charging the steel cage (6), and judge the method for the length of the steel cage (6) accordingly. The column pile is composed of two kinds of media with different electrical characteristics—reinforced steel and concrete. Concrete is a high-resistance medium, while steel is a good heterogeneous body. The electrical properties of the two are quite different. The principle is clear and reliable, easy to popularize, and low in detection costs. , The data processing method is simple.

Description

1. Technical field [0001] The invention relates to a building foundation detection technology, in particular to a method for judging the length of a steel cage in a cast-in-place pile through an electric logging curve. 2. Background technology [0002] Cast-in-place piles have the advantages of high bearing capacity and relatively simple construction technology, and are widely used as the foundation of industrial and civil buildings such as bridges, viaducts, living and production houses. Because the cast-in-place pile is an underground concealed project, the construction unit cuts corners from time to time, especially the situation that the length of the steel cage cannot meet the design requirements occurs frequently, which seriously affects the stability and seismic performance of the cast-in-place pile foundation and constitutes a building. of insecurity. [0003] At present, there are relatively mature methods for the integrity detection and bearing capacity detection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00E02D5/34G01B7/02
Inventor 董平樊敬亮潘卫育姜永基赵玮陈征宙刘朝晖杨毅文
Owner NANJING UNIV
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