Fatigue test detection clamp for embedded channel

Abstract

The utility model discloses a pre-buried channel fatigue test detection clamp which comprises an upper clamping assembly fixedly installed at the bottom end of an upper seat body connecting rod and a lower clamping assembly fixedly installed at the top end of a workbench connecting rod, and a fatigue test power mechanism is arranged at the top of the upper seat body connecting rod. The lower clamping assembly comprises a lining with an inner taper hole and two half-cone-shaped bodies which are used for being installed with the lining in a matched mode and are of a split structure, and a channel allowing the fixing rod to penetrate through is formed between the involution faces of the two half-cone-shaped bodies. And after penetrating through the channel, the fixing rod can press and fix the head of the fixing rod in the bushing through a conical pressing assembly formed by folding the two semi-conical bodies. The device has the advantages that lasting clamping force can still be effectively guaranteed under the condition that the load amplitude is large, the accuracy of deformation data measurement of the pre-buried channel is guaranteed, and the use performance requirement of a product is guaranteed; in addition, the connection reliability is further ensured, and the test result is more accurate.

Description

Technical Field

[0001] The utility model relates to a detection device for embedded components in a shield tunnel, in particular to a fatigue test detection fixture for an embedded channel. Background Technique

[0002] In order to ensure the reliability of product use, for the embedded channel products used in shield tunnels, it is necessary to meet relatively strict mechanical performance tests and fatigue performance tests. Generally, the fatigue test of the embedded channel needs to meet 2 million times, and the fatigue frequency is 1Hz - 3Hz, the waveform is a sine wave, the allowable load amplitude is 3kN (7kN - 13kN). After the fatigue test, the slot opening should not be deformed, the tensile failure load should not decrease by more than 5%, and under the action of a 28kN tensile load, the channel should not produce obvious deformation or fracture.

[0003] At present, the above test purpose is mainly achieved by the wedge-shaped fixture of a universal testing machine. It takes 8 - 23 days to complete this test. However, through practical tests, it is proved that in the work of the existing conventional wedge-shaped fixture of the universal testing machine, due to the load amplitude being unable to ensure the clamping force for a long time, slippage will occur during the process, and the deformation data of the embedded channel cannot be accurately measured. Therefore, the test data of the product detection is inaccurate, affecting the performance requirements of the final product. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a fatigue test detection fixture for an embedded channel that can accurately measure the deformation data of the embedded channel, so as to ensure the performance requirements of the product.

[0005] To solve the above technical problem, the fatigue test detection fixture for the embedded channel of the utility model includes an upper clamping assembly fixedly installed at the bottom end of the connecting rod of the upper seat body and a lower clamping assembly fixedly installed at the top end of the connecting rod of the workbench. A fatigue test power mechanism is arranged at the top of the connecting rod of the upper seat body. The upper clamping assembly is used for fixedly connecting the T-shaped bolt positioned and installed in the embedded channel, and the lower clamping assembly is used for fixedly connecting the fixing rod connected to the embedded channel. The lower clamping assembly includes a bushing with an inner conical hole and two split semi-cone bodies for fitting and installing with the bushing. A channel through which the fixing rod can pass is arranged between the mating surfaces of the two semi-cone bodies. After the fixing rod passes through this channel, its head can be tightly fixed in the bushing by the conical pressing assembly formed by the mating of the two semi-cone bodies.

[0006] The upper clamping assembly includes a connecting sleeve with a conical hole fixedly connected to the bottom end of the connecting rod of the upper seat body and a conical block located inside the connecting sleeve and mating with the conical hole. The conical block has an internal threaded hole for screwing the T-shaped bolt, and the upper end of the T-shaped bolt is screwed into the internal threaded hole of the conical block.

[0007] An upper rotary connection hole located above the conical hole is provided on the connecting sleeve. The upper seat body connecting rod is in rotary connection with the upper rotary connection hole through a lower threaded section provided at its lower end, and the bottom surface of the upper seat body connecting rod abuts against the bottom surface of the conical block.

[0008] An upper locking nut for locking the connecting sleeve is further provided on the lower threaded section of the upper seat body connecting rod.

[0009] A lower rotary connection hole located below the inner conical hole is provided on the bushing. The workbench connecting rod is screwed into the lower rotary connection hole through an upper threaded section provided at its upper end, and the top surface of the workbench connecting rod serves as a limiting surface for the head of the fixed rod. The head of the fixed rod is limited between the limiting surface and the bottom surface of the conical pressing assembly.

[0010] The conical pressing assembly is fixedly connected to the bushing through fastening bolts.

[0011] A lower locking nut for locking the bushing is provided on the workbench connecting rod.

[0012] The advantages of the present utility model are as follows:

[0013] By providing an upper clamping assembly with a specific structure fixedly installed at the bottom end of the upper seat body connecting rod and a lower clamping assembly with a specific structure fixedly installed at the top end of the workbench connecting rod, especially by designing the lower clamping assembly as a bushing with an inner conical hole and a specific structure of two split semi-cone bodies, the fixed rod can pass through the channel between the mating surfaces of the two semi-cone bodies to press and fix its head. Its clamping and fixing are firm, and even in the case of large load amplitudes, it can still effectively ensure a lasting clamping force, thereby ensuring the accuracy of the deformation data measurement of the embedded channel and meeting the product performance requirements. In addition, by designing the upper clamping assembly as a connecting sleeve with a conical hole and a conical block that cooperates with the conical hole, the reliability of its connection is further ensured, making the test results more accurate. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the fatigue test detection fixture for the embedded channel of the present utility model.

[0015] Figure 2 It is Figure 1 an enlarged structural diagram at position A of

[0016] Figure 3 It is Figure 1 an enlarged structural diagram at position B of Specific Embodiments

[0017] The following further details the fatigue test detection fixture for the embedded channel of the present utility model in conjunction with the drawings and specific embodiments.

[0018] As shown in the figure, the fatigue test detection fixture for the embedded channel of the present utility model includes an upper clamping assembly 2 fixedly installed at the bottom end of the upper seat body connecting rod 1 and a lower clamping assembly 4 fixedly installed at the top end of the workbench connecting rod 3. A fatigue test power mechanism (a conventional test mechanism, which will not be elaborated in detail in this embodiment) is provided at the top of the upper seat body connecting rod 1. A fixing rod 7 with a head is fixedly connected to the bottom of the embedded channel 5. A T-shaped bolt 6 can be fixedly installed in the slot opening of the embedded channel 5. The upper clamping assembly 2 is used for fixedly connecting the T-shaped bolt 6 positioned and installed in the embedded channel 5, and the lower clamping assembly 4 is used for fixedly connecting the fixing rod 7 connected to the embedded channel. From Figure 2 It can be seen that the said upper clamping assembly 2 includes a connecting sleeve 13 with a tapered hole 12 fixedly connected to the bottom end of the upper seat body connecting rod 1 and a tapered block 14 located inside the connecting sleeve and mating with the tapered hole. The upper end of the tapered block 14 is a cylindrical surface structure with one end larger than the maximum size of the tapered hole, whereby the tapered block can be limited within the tapered hole. The tapered block 14 has an internal threaded hole for screwing the T-shaped bolt 6, and the upper end of the T-shaped bolt 6 is screwed into the internal threaded hole of the tapered block. From Figure 3 It can be seen that the said lower clamping assembly 4 includes a bushing 9 with an internal tapered hole 8 and two split half-cone bodies 10 for mating with the bushing. A channel through which the fixing rod 7 can pass is provided between the mating surfaces of the two half-cone bodies 10. A lower threaded hole 17 is provided on the bushing 9 below the internal tapered hole 8. An upper threaded section is provided at the upper end of the workbench connecting rod 3. The workbench connecting rod 3 is screwed into the lower threaded hole through the upper threaded section provided at its upper end, and the top surface of the workbench connecting rod 3 serves as the limiting surface for the head of the fixing rod 7. After the fixing rod 7 passes through the channel between the mating surfaces of the two half-cone bodies 10, its head can be tightly fixed in the bushing 9 by a tapered pressing assembly 11 formed by the mating of the two half-cone bodies 10, that is: the head of the fixing rod 7 is limited between the limiting surface and the bottom surface of the tapered pressing assembly 11.

[0019] Furthermore, an upper threaded hole 15 is provided on the connecting sleeve 13 above the tapered hole. A lower threaded section is provided at the lower end of the upper seat body connecting rod 1. The upper seat body connecting rod 1 is in threaded connection and mating with the upper threaded hole through the lower threaded section provided at its lower end. The bottom surface of the upper seat body connecting rod 1 abuts against the bottom surface of the tapered block 14. In order to improve the fixing reliability of the connecting sleeve, an upper locking nut 16 for locking the connecting sleeve 13 can also be provided on the lower threaded section of the upper seat body connecting rod 1. Through this structural design, the requirements for strict mechanical property detection and fatigue property detection can be met.

[0020] Still further, the tapered pressing assembly 11 and the bushing 9 are fixedly connected by a fastening bolt 18. A lower locking nut 19 for locking the bushing 9 is provided on the workbench connecting rod 3.

[0021] Certainly, the above description is not a limitation to the present utility model, nor is the present utility model limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the essence of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. An embedded channel fatigue test detection fixture, characterized in that: It includes an upper clamping assembly (2) fixedly installed at the bottom end of the upper seat body connecting rod (1) and a lower clamping assembly (4) fixedly installed at the top end of the workbench connecting rod (3). A fatigue test power mechanism is provided at the top of the upper seat body connecting rod (1). The upper clamping assembly (2) is used for fixedly connecting the T-shaped bolt (6) positioned and installed in the embedded channel (5). The lower clamping assembly (4) is used for fixedly connecting the fixing rod (7) connected to the embedded channel. The lower clamping assembly (4) includes a bushing (9) having an inner conical hole (8) and two split semi-cone bodies (10) for fitting and installing with the bushing. A channel through which the fixing rod (7) can pass is provided between the mating surfaces of the two semi-cone bodies (10). After the fixing rod (7) passes through this channel, the conical pressing assembly (11) formed by the mating of the two semi-cone bodies (10) can press and fix the head of the fixing rod (7) within the bushing (9).

2. The embedded channel fatigue test detection fixture according to claim 1, wherein: The upper clamping assembly (2) includes a connecting sleeve (13) having a conical hole (12) fixedly connected to the bottom end of the upper seat body connecting rod (1) and a conical block (14) located within the connecting sleeve and mating with the conical hole. The conical block (14) has an internal threaded hole for screwing the T-shaped bolt (6). The upper end of the T-shaped bolt (6) is screwed into the internal threaded hole of the conical block.

3. The embedded channel fatigue test detection fixture according to claim 2, characterized in that: An upper screwing hole (15) is provided on the connecting sleeve (13) above the conical hole. The upper seat body connecting rod (1) is screwed and fitted with the upper screwing hole through the lower threaded section provided at its lower end. The bottom surface of the upper seat body connecting rod (1) abuts against the bottom surface of the conical block (14).

4. The embedded channel fatigue test detection fixture according to claim 3, characterized in that: An upper locking nut (16) for locking the connecting sleeve (13) is further provided on the lower threaded section of the upper seat body connecting rod (1).

5. The embedded channel fatigue test detection fixture according to any one of claims 1-4, characterized in that: A lower screwing hole (17) is provided on the bushing (9) below the inner conical hole (8). The workbench connecting rod (3) is screwed into the lower screwing hole through the upper threaded section provided at its upper end, and the top surface of the workbench connecting rod (3) serves as the limiting surface for the head of the fixing rod (7). The head of the fixing rod (7) is limited between the limiting surface and the bottom surface of the conical pressing assembly (11).

6. The embedded channel fatigue test detection fixture according to claim 5, characterized in that: The conical pressing assembly (11) is fixedly connected to the bushing (9) through a fastening bolt (18).

7. The embedded channel fatigue test detection fixture according to claim 6, characterized in that: A lower locking nut (19) for locking the bushing (9) is provided on the workbench connecting rod (3).

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