CN210427320U

CN210427320U - Bonding slippage measuring device for push-out test of concrete filled steel tubular column

Info

Publication number: CN210427320U
Application number: CN201920985217.0U
Authority: CN
Inventors: 严加宝; 陈安臻; 王涛; 罗云标
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-04-28
Anticipated expiration: 2029-06-27

Abstract

The utility model discloses a bonding and sliding measuring device for a steel pipe concrete column push-out test, which comprises two lower supporting blocks arranged at intervals, the upper support is provided with a rectangular lower cushion block, the middle of the upper support is provided with a through hole, the bottom end of a steel pipe concrete column is used as a free end to be supported on the rectangular lower cushion block, the upper end of an extending thread vertical rod is buried in concrete at the free end of the steel pipe concrete column, the lower end of the extension cross rod sequentially passes through the through hole of the rectangular lower cushion block and the through hole in the middle position of the extension cross rod and is fixedly connected with the extension cross rod through a fixed nut and a movable nut, the front end and the rear end of the extension cross rod are respectively provided with a displacement meter arranged along the vertical direction through a bracket, the pointer of the displacement meter is contacted with the horizontal plane of the end part of the extension cross rod, the slip value of the concrete at the free end of the concrete-filled steel tube column relative to the steel tube can be obtained by measuring the displacement of the extension cross rod, and the measurement result is accurate and reliable.

Description

Bonding slippage measuring device for push-out test of concrete filled steel tubular column

Technical Field

The utility model relates to a building structure test device, concretely relates to steel core concrete column bonding sliding performance measuring device.

Background

The bonding and sliding performance is one of the most important directions in the research of the structure of the steel pipe concrete column, and the push-out test and the push-off test are mainly adopted aiming at the research of the bonding and sliding performance of the steel pipe concrete column at present. The push-out test can measure the whole process of the bonding and sliding of the steel pipe concrete column interface and determine the ultimate bonding strength, and the method is mostly adopted in the current research. The tau-s constitutive relation is determined by a push-out test, the binding force tau is obtained by load conversion of a press, the slippage s between the core concrete and the steel pipe is measured by a displacement meter, and the measurement modes of the current common test mainly comprise: (1) only measuring the slippage of the concrete at the loading end relative to the steel pipe; (2) the core concrete slippage relative to the steel pipe is obtained by perforating a small hole on the wall of the steel pipe with a thin steel bar and measuring the displacement of the thin steel bar. The method (1) can only measure the slippage condition of the loading end; the method (2) can measure the concrete slip condition in the middle of the steel tube concrete column, and can weaken the steel tube by opening holes in the wall of the steel tube, thereby having adverse effect on the bonding slip performance.

Disclosure of Invention

An object of the utility model is to overcome prior art's shortcoming, provide a sufficient stable accurate steel core concrete column bonding slippage performance measuring device of free end bonding slippage measured value.

In order to solve the technical problem, the technical scheme is as follows:

the utility model discloses a steel pipe concrete column push-out test bonding slippage measuring device, which comprises two lower supporting blocks which are arranged in parallel and at opposite intervals at the left and right, a rectangular lower cushion block is supported and arranged on the two lower supporting blocks along the horizontal direction, a through hole is arranged in the middle of the rectangular lower cushion block, the through hole is arranged at the middle position between the two lower supporting blocks, the bottom end of a steel pipe concrete column is taken as a free end and is supported on the rectangular lower cushion block, the upper end of a stretching thread vertical rod is embedded in the concrete at the free end of the steel pipe concrete column, the lower end of the stretching thread vertical rod sequentially passes through the through hole of the rectangular lower cushion block and the through hole on the middle position of the stretching cross rod and is fixedly connected with the stretching cross rod through a fixed nut and a movable nut, the stretching cross rod is arranged at the middle position between the two lower supporting blocks along the horizontal direction, a displacement meter arranged along the vertical direction is respectively arranged at the, the two displacement meters are symmetrically arranged around the central axis of the through hole, and the pointers of the displacement meters are in contact with the horizontal plane of the end part of the extension cross rod.

The device of the utility model can measure the sliding value of the free end of the steel pipe concrete column; the extension threaded vertical rod is embedded in the steel pipe concrete column in the component manufacturing process, and the extension transverse rod and the extension threaded vertical rod are reliably connected through a bolt, so that the free end bonding slippage measurement value is stable and accurate enough; the design of the measuring device enables the concrete-filled steel tube column to be connected with the extension cross rod, the displacement of the free end can be measured by means of the displacement meter after the movable bolt is screwed down, and the measuring device is easy to install and convenient to operate.

Drawings

FIG. 1 is a schematic view of a vertical structure of a concrete filled steel tubular column push-out test bonding slippage measuring device;

FIG. 2 is a side view of the apparatus shown in FIG. 1 with the lower support block and lower head block removed;

FIG. 3 is a top view of the lower pad of the apparatus shown in FIG. 1;

fig. 4 is a top view of the extension rail of the device shown in fig. 1.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the accompanying drawings.

As shown in the attached drawings, the utility model discloses a steel core concrete column push-out test bonding slippage measuring device, including two lower supporting blocks 3 that are arranged in parallel and relatively spaced from each other from left to right, a rectangular lower cushion block 2 is supported and arranged on the two lower supporting blocks 3 along the horizontal direction, a through hole 9 is opened in the middle of the rectangular lower cushion block 2, the through hole 9 is arranged at the middle position between the two lower supporting blocks 3, a steel core concrete column 8 bottom end is used as the free end and is supported on the rectangular lower cushion block 2, the upper end of a stretching thread vertical rod 5 is buried in the concrete at the free end of the steel core concrete column 8, the lower end of the stretching thread vertical rod 5 sequentially passes through the through hole 9 of the rectangular lower cushion block and a through hole 12 at the middle position of the stretching cross rod 4 and is fixedly connected with the stretching cross rod 4 through a fixed nut 10 and a movable nut 11, wherein the fixed nut 10 is tightly pressed, the movable nut 11 is tightly pressed on the bottom wall of the extension transverse rod 4. The extension cross bar 4 is arranged in the middle between the two lower supporting blocks 3 along the horizontal direction. The fixed nut 10 and the movable nut 11 form an extension rod connecting nut 6. The extension rod connecting nuts 6 are screwed on the extension threaded vertical rods 5, and the extension transverse rods 4 are connected with the extension threaded vertical rods 5 through the through holes 12.

The front end and the rear end of the extension transverse rod 4 are respectively provided with a displacement meter 7 arranged along the vertical direction through a support, the two displacement meters 7 are symmetrically arranged relative to the central axis of the through hole 9, and the pointer of the displacement meter 7 is in contact with the horizontal plane of the end part of the extension transverse rod.

Compared with other measuring devices, the device can measure the displacement of the free end on the premise of not weakening the concrete filled steel tubular column 8, and the reliability of the test is greatly improved.

The extension rail 4 is made of steel or other material with sufficient rigidity. The screw is convenient to install, so that the time and labor are greatly reduced; the material with enough rigidity is selected, so that the extension cross rod 4 is not deformed in the test process, and the accuracy of the measurement result is improved.

The movable nut 11 is preferably a butterfly nut or a nut which is easy to tighten by one hand. The adoption of the materials in the form facilitates the installation of the device and saves a great deal of time and labor.

The method comprises the steps that when the steel pipe concrete column is manufactured, a stretching thread vertical rod is embedded into the steel pipe concrete column and stretches out for a certain distance, the free end of the steel pipe concrete column is placed on a rectangular lower cushion block 2 during testing, a stretching thread vertical rod 5 penetrates through a through hole 9 of the rectangular lower cushion block and is fixed with a stretching cross rod through a connecting bolt, a displacement meter is arranged to the vertical direction, and a pointer of the displacement meter is in contact with the horizontal plane of the end portion of the stretching cross rod. The extension thread vertical rod embedded into the concrete can drive the extension cross rod to move downwards together along with the slippage of the concrete along the direction of the steel pipe in the pushing-out test process, and the relative displacement between the concrete at the free end of the steel pipe concrete column and the steel pipe can be accurately reflected by the change of the reading of the displacement meter. The device can obtain the slip value of the concrete at the free end of the concrete-filled steel tubular column relative to the steel tube by measuring the displacement of the extension cross rod, and the measurement result is accurate and reliable. Moreover, the device is convenient and quick to install.

The above description of the present invention is provided to facilitate understanding and application of the present invention by those of ordinary skill in the art. It will be apparent to those skilled in the art that various modifications can be easily made to the present invention and applied to other embodiments without the inventive faculty. Therefore, the present invention is not limited to the embodiments herein, and those skilled in the art should understand that modifications and alterations made without departing from the scope of the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a steel core concrete column release test bonding measuring device that slides, includes two lower supporting shoes that control parallel relative interval set up two lower supporting shoes on support along the horizontal direction and be provided with cushion under the rectangle, its characterized in that: the middle of the rectangular lower cushion block is provided with a through hole, the through hole is arranged at the middle position between the two lower supporting blocks, the bottom end of a steel pipe concrete column is used as a free end and is supported on the rectangular lower cushion block, the upper end of a stretching thread vertical rod is embedded in concrete at the free end of the steel pipe concrete column, the lower end of the stretching thread vertical rod sequentially penetrates through the through hole of the rectangular lower cushion block and the through hole in the middle position of the stretching cross rod and is fixedly connected with the stretching cross rod through a fixing nut and a movable nut, the stretching cross rod is arranged at the middle position between the two lower supporting blocks along the horizontal direction, a displacement meter arranged along the vertical direction is respectively arranged at the front end and the rear end of the stretching cross rod through a support, the two displacement meters are symmetrically arranged relative to the central axis of the through hole, and the pointer of the displacement meter is contacted with.