Grouting sleeve joint displacement deformation measuring device

Abstract

The utility model discloses a grouting sleeve joint displacement deformation measuring device, which belongs to the technical field of constructional engineering tests, and comprises a grouting sleeve joint arranged between an upper chuck of a testing machine and a lower chuck of the testing machine, the grouting sleeve joint comprises a sleeve body, and the upper end and the lower end of the sleeve body are respectively a grouting connecting end and a mechanical connecting end; the grouting connecting end is connected with the testing machine upper chuck through a grouting connecting end steel bar, and the mechanical connecting end is connected with the testing machine lower chuck through a mechanical connecting end steel bar; the grouting connecting end reinforcing steel bar is tightly attached to the upper portion of the grouting connecting end, and an elastic clamp is fixedly arranged on the grouting connecting end reinforcing steel bar; the elastic clamp is connected with the upper end of the extensometer, and the lower end of the extensometer is connected with the sleeve body. The lower end of the extensometer is fixed outside the sleeve, and the upper end of the extensometer is fixed on the reinforcing steel bar at the upper port of the sleeve through the elastic clamp, so that displacement of the grouting sleeve joint can be accurately measured, and interference of reinforcing steel bar deformation is eliminated; the device has the characteristics of simple structure, convenient operation, accurate measurement and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction engineering tests, and in particular relates to a displacement deformation measuring device for a grouting sleeve joint. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] In the fields of civil engineering and building structures, grouting sleeve joints are a commonly used connection method, and the stability and reliability of their performance are crucial to the safety of the entire structure.

[0004] To accurately evaluate the performance of grouting sleeve joints, precise measurement of their displacement changes during load-bearing is necessary. However, existing measurement methods typically analyze the displacement performance of grouting sleeve joints using the displacement between the upper and lower clamps of the test equipment during pull-out tests. This displacement includes the deformation of the steel bars at both ends of the sleeve joint and is therefore inaccurate. This method suffers from insufficient precision and complex operation, failing to meet the needs of research and engineering applications. Utility Model Content

[0005] In response to the above problems, the utility model provides a grouting sleeve joint displacement deformation measuring device. By fixing the lower end of the extensometer to the outside of the sleeve and the upper end to the steel bar at the upper end of the sleeve with the help of an elastic clamp, the displacement of the grouting sleeve joint can be accurately measured, eliminating the interference of steel bar deformation; it has the characteristics of simple structure, convenient operation, and accurate measurement.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A grouting sleeve joint displacement deformation measuring device includes a testing machine, the testing machine is provided with an upper chuck and a lower chuck of the testing machine, and a grouting sleeve joint is installed between the upper chuck and the lower chuck of the testing machine.

[0008] The grouting sleeve joint includes a sleeve body, and the upper and lower ends of the sleeve body are respectively a grouting connection end and a mechanical connection end; the grouting connection end is connected to the upper clamp of the testing machine through the grouting connection end steel bar, and the mechanical connection end is connected to the lower clamp of the testing machine through the mechanical connection end steel bar;

[0009] Closely attached to the top of the grouting connection end, an elastic clamp is fixedly provided on the steel bar of the grouting connection end;

[0010] The elastic clamp is connected to the upper end of the extensometer, and the lower end of the extensometer is connected to the sleeve body.

[0011] Preferably, the interior of the sleeve body is hollow, and a grouting hole and a slurry outlet hole are provided on one side of the sleeve body, and the slurry outlet hole is located above the grouting hole.

[0012] Preferably, the grouting connection end steel bar penetrates into the interior of the grouting sleeve joint through the grouting connection end, and the bottom end of the grouting connection end steel bar is located at the grouting hole and is fixed by grouting.

[0013] Preferably, the mechanical connection end steel bar is threadedly connected to the mechanical connection end.

[0014] Preferably, the grouting connection end has a larger opening, while the mechanical connection end has a smaller opening.

[0015] Preferably, the elastic clamp includes two clamping iron sheets, the middle part of the clamping iron sheets is an arc-shaped plate; the arc-shaped plates are fixedly connected to flat plates on both sides, and the flat plates on both sides are symmetrical relative to the arc-shaped plates, and bolt holes are provided on the flat plates for passing hexagonal bolts.

[0016] Preferably, a double-layer limiting iron sheet is fixedly provided at the bottom end of one of the clamped iron sheets, and the double-layer limiting iron sheet has a certain spacing between the double-layer iron sheets, which serves as a slot to fix the upper end of the extensometer; and the end of the double-layer limiting iron sheet is flush with the outer side of the sleeve body.

[0017] Preferably, a rubber gasket is bonded and fixed on the inner side of the arc-shaped plate clamping the iron sheet, and the rubber gasket is required to be elastic and of appropriate thickness.

[0018] Preferably, the extensometer further includes an extensometer body, and the upper end and the lower end of the extensometer are arranged in parallel and fixedly connected to the extensometer body.

[0019] Preferably, the upper chuck of the testing machine and the lower chuck of the testing machine are connected via a testing machine column, the testing machine column is fixedly connected to the lower chuck of the testing machine, and is slidably connected to the upper chuck of the testing machine.

[0020] Compared with the prior art, the advantages and positive effects of this utility model are:

[0021] By securing the lower end of the extensometer to the outside of the sleeve and the upper end to the rebar at the upper end of the sleeve with the aid of an elastic clamp, this utility model accurately measures the displacement of the grouting sleeve joint, eliminating interference from rebar deformation. It features a simple structure, convenient operation, and accurate measurement. A rubber gasket is affixed to the inside of the clamp to clamp the rebar at the grouting connection end. The elastic deformation of the rubber gasket ensures that the elastic clamp does not loosen due to rebar diameter shrinkage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] Figure 1It is an overall schematic diagram of an embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the connection between the grouting sleeve joint and the elastic clamp according to an embodiment of the present utility model;

[0025] Figure 3 It is a cross-sectional schematic diagram of the connection between the grouting sleeve joint of the embodiment of the utility model and the mechanical connection end steel bar and the grouting connection end steel bar;

[0026] Figure 4 This is a schematic diagram of an elastic clamp according to an embodiment of the present utility model;

[0027] In the picture:

[0028] 1. Clamping iron sheet; 2. Double-layer limiting iron sheet; 3. Rubber gasket; 4. Hexagon socket bolt; 5. Rebar at mechanical connection end; 6. Rebar at grouting connection end; 7. Grouting sleeve joint; 8. Grouting hole; 9. Grouting hole; 10. Extensometer; 11. Upper chuck of testing machine; 12. Lower chuck of testing machine; 13. Column of testing machine; 14. Elastic clamp. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] The present invention will be described in detail below with reference to the accompanying drawings. This embodiment discloses a grouting sleeve joint displacement deformation measuring device, such as Figure 1 As shown, the testing machine includes a tensile testing machine using existing technology. The testing machine is provided with an upper chuck 11 and a lower chuck 12. The upper chuck 11 and the lower chuck 12 are connected by a testing machine column 13. The upper chuck 11 can move up and down along the testing machine column 13 relative to the lower chuck 12. Under the action of the testing machine column, the upper chuck can be guaranteed not to deviate when moving up and down. It can be understood that the upper chuck, the lower chuck, and the testing machine column are all part of the testing machine. The position of the lower chuck is fixed, and the upper chuck is driven by the existing testing machine power output terminal; the testing machine column is fixedly connected to the lower chuck and slidably connected to the upper chuck. This embodiment is not an improvement to the testing machine itself, but rather utilizes an existing testing machine to perform corresponding tests.

[0031] In this embodiment, the subject of measurement is the grouting sleeve joint. Figure 1 、 Figure 2As shown, a grouting sleeve joint 7 is installed between the upper clamp of the testing machine and the lower clamp of the testing machine. Specifically, the upper end of the grouting sleeve joint 7 is connected to the upper clamp of the testing machine through the grouting connection end steel bar 6, and the lower end of the grouting sleeve joint 7 is connected to the lower clamp of the testing machine through the mechanical connection end steel bar 5.

[0032] like Figure 2 As shown, the grouting sleeve joint 7 includes a sleeve body, the upper and lower ends of the sleeve body are respectively a grouting connection end and a mechanical connection end, the grouting connection end has a larger opening, and the mechanical connection end has a smaller opening. The sleeve body is hollow inside, and a grouting hole 8 and a slurry outlet hole 9 are provided on one side of the sleeve body, and the slurry outlet hole is located above the grouting hole. Figure 3 As shown, the grouting connection end steel bar 6 needs to penetrate deep into the grouting sleeve joint 7 through the grouting connection end, and the bottom of the grouting connection end steel bar 6 needs to be located at the grouting hole, and then grouting is fixed; the mechanical connection end steel bar 5 can be fixedly connected to the mechanical connection end, and the connection between the mechanical connection end steel bar 5 and the mechanical connection end can adopt existing technology, such as threaded connection, the inner wall of the mechanical connection end is provided with an internal thread, and one end of the mechanical connection end steel bar 5 is processed with an external thread.

[0033] like Figure 1 、 Figure 2 As shown, the apparatus also includes an elastic clamp 14, which is mounted on the rebar 6 at the grouting connection and closely adheres to the connection. The elastic clamp 14 is connected to the upper end of an extensometer 10, the lower end of which is connected to the sleeve body. During testing, the rebar at the grouting connection is pulled and stretched by the chuck on the testing machine, gradually separating the elastic clamp from the grouting connection, increasing the gap between them and causing the extensometer to open.

[0034] like Figure 4 As shown, the elastic clamp 14 includes two clamping iron sheets 1, the middle part of the clamping iron sheets 1 is an arc-shaped plate, which is used to clamp the steel bars at the grouting connection end; the arc-shaped plates are fixedly connected to the flat plates on both sides, and the flat plates on both sides are symmetrical relative to the arc-shaped plates. Bolt holes are provided on the flat plates for passing the hexagonal bolts 4.

[0035] At the bottom end of one of the clamped iron sheets 1, a double-layer limiting iron sheet 2 is fixedly installed. The distance between the double-layer iron sheets of the double-layer limiting iron sheet 2 is about 1 mm, which serves as a slot to fix the upper end of the extensometer; and the end of the double-layer limiting iron sheet needs to be flush with the outer side of the sleeve body, so as to ensure that the upper and lower ends of the extensometer remain parallel to the grouting sleeve joint specimen during the test.

[0036] like Figure 4As shown, a rubber gasket 3 is fixedly installed on the inner side of the curved plate of the clamping iron sheet 1. It is understood that the rubber gasket can be fixed to the inner side of the curved plate of the clamping iron sheet 1 by bonding. The rubber gasket requires elasticity and appropriate thickness. When installing the clamp, by tightening the hexagon socket bolt 4, the rubber gasket is compressed and deformed sufficiently to clamp the grouting connection end steel bar. When the grouting connection end steel bar is pulled and its diameter decreases, the rubber gasket recovers its deformation, so that the clamping iron sheet 1 can still be firmly clamped to the grouting connection end steel bar, preventing it from loosening and falling off.

[0037] like Figure 2 As shown, the extensometer 10 further includes an extensometer body. The upper end and the lower end of the extensometer 10 are arranged in parallel and fixedly connected to the extensometer body.

[0038] The arc-shaped plates of the two clamping iron sheets 1 are used to clamp the steel bars 6 at the grouting connection end, so that the rubber gasket wraps the steel bars 6 at the grouting connection end; then the two hexagon socket bolts 4 are passed through the bolt holes on both sides of the two clamping iron sheets 1, and tightened with matching nuts to fix the elastic clamp 14 on the steel bars 6 at the grouting connection end. Then the upper end of the extensometer 10 is set in the double-layer limiting iron sheet 2, and the lower end of the extensometer 10 is fixed to the sleeve body. It should be noted that in this embodiment, the lower end of the extensometer 10 is "L"-shaped, with its long side perpendicular to the sleeve body and its short side close to the sleeve body. It can be fixed to the barrel of the sleeve body by wrapping the short side with iron wire.

[0039] It should be noted that the extensometer is connected to the testing machine and transmits the measured displacement data to the testing machine in real time. The testing machine can display and record the curve of displacement changing with the test loading force.

[0040] Working principle:

[0041] Place the grouting sleeve joint specimen with the extensometer installed in the testing machine, and connect the steel bars at the grouting connection end and the mechanical connection end to the upper and lower clamps of the testing machine respectively;

[0042] Then the test loading was carried out, during which the elastic clamp gradually separated from the grouting connection end, the distance between them became larger, and the extensometer opened;

[0043] At the same time, the steel bars at both ends of the sleeve body are stretched and thinned, but the elastic clamp will not loosen due to the thinning of the steel bars due to the effect of the rubber gasket, and can remain relatively fixed to the steel bars. That is, the upper end of the extensometer can remain relatively fixed to the steel bars; the extensometer can measure displacement stably and accurately;

[0044] When the steel bar at the grouting connection end breaks or the steel bar at the grouting connection end in the sleeve is quickly pulled out and the force drops rapidly, the test is stopped and the extensometer and elastic clamp are removed.

[0045] This embodiment fixes the lower end of the extensometer to the outside of the sleeve and the upper end to the steel bar at the upper end of the sleeve with the help of an elastic clamp, so as to accurately measure the displacement of the grouting sleeve joint and eliminate the interference of steel bar deformation.

[0046] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A grouting sleeve joint displacement deformation measuring device, comprising a testing machine, the testing machine being provided with an upper chuck and a lower chuck of the testing machine, characterized in that: Install the grouting sleeve joint between the upper chuck and the lower chuck of the testing machine. The grouting sleeve joint includes a sleeve body, and the upper and lower ends of the sleeve body are respectively a grouting connection end and a mechanical connection end; the grouting connection end is connected to the upper clamp of the testing machine through the grouting connection end steel bar, and the mechanical connection end is connected to the lower clamp of the testing machine through the mechanical connection end steel bar; An elastic clamp is fixedly arranged on the steel bar of the grouting connection end, close to the top of the grouting connection end; the elastic clamp is connected to the upper end of the extensometer, and the lower end of the extensometer is connected to the sleeve body.

2. A grouting sleeve joint displacement deformation measuring device according to claim 1, characterized in that: The interior of the sleeve body is hollow, and a grouting hole and a slurry outlet hole are provided on one side of the sleeve body, and the slurry outlet hole is located above the grouting hole.

3. A grouting sleeve joint displacement deformation measuring device according to claim 2, characterized in that: The steel bar at the grouting connection end penetrates into the interior of the grouting sleeve joint through the grouting connection end, and the bottom end of the steel bar at the grouting connection end is located at the grouting hole and is fixed by grouting.

4. A grouting sleeve joint displacement deformation measuring device according to claim 1, characterized in that: The mechanical connection end steel bar is threadedly connected to the mechanical connection end.

5. A grouting sleeve joint displacement deformation measuring device according to claim 1, characterized in that: The grouting connection end has a larger opening, while the mechanical connection end has a smaller opening.

6. A grouting sleeve joint displacement deformation measuring device according to claim 1, characterized in that: The elastic clamp includes two clamping iron sheets, the middle part of the clamping iron sheets is an arc-shaped plate; the two sides of the arc-shaped plate are fixedly connected to the flat plates, and the flat plates on both sides are symmetrical relative to the arc-shaped plate. Bolt holes are provided on the flat plates for passing hexagonal bolts.

7. A grouting sleeve joint displacement deformation measuring device according to claim 6, characterized in that: A double-layer limiting iron sheet is fixedly provided at the bottom end of one of the clamping iron sheets. The double-layer limiting iron sheet has a certain spacing between the two layers and serves as a slot to fix the upper end of the extensometer; and the end of the double-layer limiting iron sheet is flush with the outer side of the sleeve body.

8. A grouting sleeve joint displacement deformation measuring device according to claim 6, characterized in that: A rubber gasket is bonded and fixed on the inner side of the arc-shaped plate for clamping the iron sheet.

9. The grouting sleeve joint displacement deformation measuring device according to claim 1, characterized in that: The extensometer further comprises an extensometer body. The upper end and the lower end of the extensometer are arranged in parallel and fixedly connected to the extensometer body.

10. The grouting sleeve joint displacement deformation measuring device according to claim 1, characterized in that: The upper chuck of the testing machine is connected to the lower chuck of the testing machine through a testing machine column. The testing machine column is fixedly connected to the lower chuck of the testing machine and is slidably connected to the upper chuck of the testing machine.

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