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A pull-out test loading device

A loading device and pull-out test technology, which is applied in the test of foundation structure, construction, foundation structure engineering, etc., can solve the problem that the confinement effect of steel pipes on concrete cannot be considered, the accurate measurement of pull-out performance cannot be achieved, and the failure of bonding at the anchorage interface and other issues to achieve the effect of improving feasibility and versatility, saving test costs, and avoiding deformation errors

Active Publication Date: 2020-06-05
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional anchor pullout test device is aimed at the anchoring effect of materials such as bonded anchor rods and plain concrete. The main failure form is the bonding failure of the anchor interface. The operation is relatively simple. The existing device cannot consider the constraints of steel pipes on concrete. effect, which in turn will cause the measurement results to be too small, and it is impossible to achieve accurate measurement of the drawing performance under different conditions

Method used

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  • A pull-out test loading device
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  • A pull-out test loading device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In order to overcome the problems existing in the traditional pull-out test device, a pull-out test loading device is provided, which can complete the pull-out test by adding pads and other devices according to different loading requirements. The easy-to-operate pull-out test loading device can complete the pull-out test by adding pads and other devices according to different loading requirements.

[0046] A kind of drawing test loading device, is set as the single drawing device of the drawing device of single small steel pipe such as figure 1 As shown, it includes a pad 1, a sensor 2, a puller 3, a displacement meter 4, a bracket 5 and a small steel pipe 6, the front end of the small steel pipe 6 is inserted into the steel pipe concrete 7, and the pad 1 passes through the small steel pipe 6 and the steel pipe concrete 7 contacts, fixed on the outer edge of the steel pipe concrete 7, the sensor 2 is fixed on the rear side of the pad 1 through the small steel pipe 6, th...

Embodiment 2

[0056] To the pull-out test loading device of embodiment 1, concrete test process is as follows:

[0057] 1. Pre-embed the small steel pipe in the concrete filled steel pipe, insert the fixed end of the small steel pipe into the large steel pipe of the concrete filled steel pipe before pouring the concrete, and then pour the concrete to form the concrete filled steel pipe.

[0058] 2. The cushion block passes through the small steel pipe and penetrates the slot hole, and the curved surface of the cushion block is seamlessly fixed on the outer edge of the steel pipe concrete to ensure that the cushion block fully plays the role of connection.

[0059] 3. The sensor runs through the small steel pipe in the middle, and is connected behind the pad, and the gasket is installed on the small steel pipe behind the pad first, that is, a gasket is added between the pad and the sensor for buffering and protection. .

[0060] 4. The puller passes through the middle through hole, and is c...

Embodiment 3

[0066] When measuring the load-displacement curve at different positions of the concrete filled steel tube, multiple pulling devices for small steel tubes can be installed at the same time for testing. A plurality of small steel pipes are arranged in parallel in the vertical direction on the outer edge of the steel pipe of the concrete-filled steel pipe, and installation tests at different positions can also be carried out as required. Through multiple small steel pipes, the superposition effect and group anchor effect of the damaged area can be studied.

[0067] Such as Figure 4 As shown in , three small steel pipes are set in the vertical direction. The three small steel pipes are arranged in parallel on the same straight line. The front ends of the three small steel pipes are all inserted into the steel pipe concrete. The setting of the steel pipe is provided with a spacer 1, a sensor 2, a puller 3, and a displacement gauge 4, and the other two small steel pipes are respe...

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Abstract

The invention relates to a pull-out test loading device which comprises cushion blocks, sensors, pullers, displacement meters, a support and small steel pipes. The front ends of the small steel pipesare inserted into steel pipe concrete. The cushion blocks penetrate the small steel pipes and make contact with the steel pipe concrete. The cushion blocks are fixed to the outer edge of the steel pipe concrete. The sensor is fixed to the rear side of each cushion block through the corresponding small steel pipe. The puller is fixed to the rear side of each sensor. The displacement meter is fixedly arranged on each puller. The support is arranged at the tail ends of the small steel pipes. According to the pull-out test loading device, testing of parameters of steel pipe pulling resistant force, anchoring force, the reasonable anchoring length and the optimal interval between the adjacent small steel pipes can be completed smoothly, feasibility, universality and accuracy are improved, and the test cost is saved.

Description

technical field [0001] The invention relates to a pull-out test loading device, which belongs to the technical field of pull-out tests. Background technique [0002] The pipe curtain construction method is a new type of underground excavation technology, and it is a construction method for building large-span and large-section underground projects on the basis of small sections. It is based on single-pipe jacking, and the single pipes are connected on the side of the steel pipe by the lock to form a pipe row, and a water-stopping agent is injected into the gap between the locks to meet the water-stop requirement. After the pipe row is jacked, a pipe curtain is formed. However, with the increasing challenges faced by the construction of underground space, the traditional pipe curtain structure that only uses locks to connect can no longer meet the needs of some constructions. Then a new pipe curtain construction method was proposed: the adjacent steel pipes are connected by s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 赵文贾鹏蛟董驾潮王志国陈阳韩健勇李慎刚王云墨李天亮
Owner NORTHEASTERN UNIV LIAONING
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