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Hydraulic self-balancing type single-pile vertical uplift static load test method and device

A self-balancing, static load test technology, applied in the test of basic structure, construction, basic structure engineering, etc., can solve the problems of uneven distribution of uplift force, poor adaptability, error, etc., to achieve uniform force and reduce test. Error, the effect of uniform stress on the main reinforcement

Active Publication Date: 2020-09-01
广州市市政工程试验检测有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Generally speaking, the existing detection devices and the test process have not solved the problem of uneven distribution of the pull-out force, and the damage of a single main bar due to the pull-out force exceeding the strength of the main bar
Its structure still has poor adaptability and serious errors

Method used

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  • Hydraulic self-balancing type single-pile vertical uplift static load test method and device
  • Hydraulic self-balancing type single-pile vertical uplift static load test method and device
  • Hydraulic self-balancing type single-pile vertical uplift static load test method and device

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] Such as figure 1 and figure 2 As shown, a preferred embodiment of a hydraulic self-balancing type single pile vertical pull-out static load test method provided by one aspect of the present invention, it comprises the steps:

[0034]Step 1, install the reaction mechanism for the selected test pile, install the hydraulic jack 1 on the reaction mechanism, and require the central axis of the hydraulic jack 1 to be coaxial with the central a...

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Abstract

The invention discloses a hydraulic self-balancing type single-pile vertical uplift static load test method and device. A counter-force mechanism, a hydraulic jack, a steel strand and a steel structure anchor frame with a center hole jack are utilized; after the center hole jack is connected with main ribs of a test pile through the steel strand, vertical uplift force is applied to the test pile through the hydraulic jack; when the center hole jack exceeds a pressure limiting value PL, the center hole jack automatically releases pressure, the steel strand can generate vertical displacement relative to the center hole jack, and the rest of the center hole jack which does not reach the pressure limiting value PL continues to uplift the main ribs of the test pile; and when the uplift force iscontinuously increased to the pressure limiting value PL, the corresponding center hole jack also automatically releases pressure, uplift and pressure release are synchronously carried out, finally,the uplift force borne by the main ribs is dynamically balanced through pressure limiting control of the center hole jack, then the main ribs of the test pile are stressed evenly, and test errors aregreatly reduced. The method and device can meet the detection test requirements of foundation piles of different pile types and different pile diameters.

Description

technical field [0001] The invention relates to the field of foundation engineering test methods and equipment, in particular to a hydraulic self-balancing single pile vertical pull-out static load test method and device. Background technique [0002] In the process of building construction, in order to ensure the quality of pile foundation engineering, it is very necessary to test the bearing capacity of single piles. At present, the static load test is the most intuitive and reliable method to test the bearing capacity of a single pile. First of all, when the reaction force device and the main reinforcement of the test pile are connected by welding, the test results are seriously affected by the welding process, and there is a problem of uneven stress on the main reinforcement, and there are errors in the test results. Secondly, when the pile cap is connected with the reaction force device, the main reinforcement of the uplift pile extends into the pile cap on the top of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 唐孟雄周治国孙晓立吴瑞卿邵继喜卞德存张午阳王卫江刘龙肖鹏辉叶东昌
Owner 广州市市政工程试验检测有限公司
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