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Method for detecting reinforcing bar cage length in concrete pouring pile by magnetic logging method

A technology of cast-in-place piles and steel cages, which is applied in the direction of electric/magnetic detection for logging records, can solve problems such as not popularization and application, and can not solve the problems of length detection of steel cages, and achieves low detection cost. , The method is intuitive and simple, and the effect of promotion is simple

Active Publication Date: 2009-05-20
NANJING UNIV
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  • 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 in concrete pouring pile by magnetic logging method
  • Method for detecting reinforcing bar cage length in concrete pouring pile by magnetic logging method
  • Method for detecting reinforcing bar cage length in concrete pouring pile by magnetic logging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Figure 2—A It is the No. 1 cast-in-situ pile with a diameter of 1m and a length of 16m (the unit in the figure is mm), and the situation of the No. 1 cast-in-place pile is shown in Table 1.

[0029] Figure 2-B It is the No. 2 cast-in-situ pile with a diameter of 1m and a length of 18.6m (the unit is mm in the figure). The situation of the No. 2 cast-in-place pile is shown in Table 2.

[0030] Table 1 Situation of cast-in-place pile No. 1

[0031]

parts

pile length

The length of the reinforcement cage in the pile

(m) Reinforcement cages in piles

Upper section

8

8

The main reinforcement (10) is 24 pieces of HRB335 steel with a diameter of Φ16

ribs; ribs (12) are Φ16 in diameter and 2m apart

HRB335 steel bar; Spiral bar (11) is diameter Φ8, between

HPB235 steel bars at a distance of 0.2m lower paragraph 8 0 no steel cage, made of concrete

[0032] Table 2 Sit...

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Abstract

A method for measuring length of steel bar case in bored concrete pile by magnetic well logging means includes drilling a hole on center of formed-bored concrete pile, utilizing instrument of well logging means to test magnetic induction intensity along drilled hole, judging out length of steel bar cage and quantity variation boundary of steel bar according to magnetic induction intensity variation along depth direction of drilled hole.

Description

1. Technical field [0001] The invention relates to building foundation detection technology, in particular to a method for judging the change interface of the number of steel bars and the length of a steel bar cage in a concrete cast-in-situ pile through the magnetic induction intensity or the magnetic susceptibility curve in the magnetic logging method. 2. Background technology [0002] Cast-in-situ 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, etc. Because the cast-in-place pile is an underground concealed project, construction units often cut corners and materials, especially when the length of the steel cage cannot meet the design requirements, which seriously affects the stability and seismic performance of the cast-in-place pile foundation. unsafe hazards. [0003] At present, there are rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/26
Inventor 董平樊敬亮赵玮王良书潘卫育李才明刘朝晖杨毅文
Owner NANJING UNIV
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