Hydraulic engineering concrete axial stretching preloading connection device

Abstract

The utility model discloses a hydraulic engineering concrete axial stretching pre-loading connecting device which comprises an upper connecting rod, a lower connecting rod, a lower connecting rod, an upper connecting rod and a lower connecting rod. The middle connecting rod is detachably connected with the upper connecting rod, and a resistance type stress sensor is installed in the middle connecting rod; the lower connecting rod is detachably connected with the middle connecting rod; and the connector is connected with the lower connecting rod. The hydraulic engineering concrete axial stretching preloading connection device is high in working efficiency, stable and reliable in data, automatic and intelligent, improves the accuracy and the stability of concrete axial stretching preloading control, avoids interference of human factors on the accuracy and the stability of data, and improves the accuracy and the stability of concrete axial stretching preloading control. The device is especially suitable for operation of personnel with less test operation experience.

Description

Technical Field

[0001] The utility model belongs to the technical field of concrete axial stretching, and in particular relates to a preload connection device for axial stretching of concrete in a water conservancy project. Background Art

[0002] At present, the existing concrete axial tensile preload has a large number of human control factors, and the test personnel need to manually and based on experience adjust the connection between the specimen and the tie rod. The test operation process is relatively subjective, and it is impossible to automatically stop after the load reaches 15% to 20% of the failure load. As a result, the axial tensile strength, ultimate tensile strength, and axial tensile elastic modulus test data are inaccurate, unreliable, and unstable due to the preload exceeding the failure load. Utility Model Content

[0003] In order to solve the above problems, the utility model proposes a hydraulic engineering concrete axial tensile preload connection device.

[0004] The utility model discloses a hydraulic engineering concrete axial tensile preload connection device, comprising: an upper connecting rod, on which a pin hole is provided; a middle connecting rod, which is detachably connected to the upper connecting rod and in which a resistive stress sensor is installed; a lower connecting rod, which is detachably connected to the middle connecting rod; and a connecting head, which is connected to the lower connecting rod.

[0005] Optionally, the detachable connection is a threaded connection.

[0006] Optionally, the pin hole is located at one end of the upper connecting rod, and an upper rotating internal thread is provided on an end surface of the upper connecting rod away from the pin hole.

[0007] Optionally, an upper rotating rod and a lower rotating rod are respectively provided at both ends of the middle connecting rod, and the upper rotating rod is connected to the upper connecting rod by threads.

[0008] Optionally, the middle connecting rod is connected to the upper rotating rod and the lower rotating rod through threads.

[0009] Optionally, an end surface of the lower connecting rod away from the connecting head is provided with a lower rotating internal thread, and the lower connecting rod is connected to the lower rotating rod on the middle connecting rod through threads.

[0010] Optionally, the connecting head is fixedly connected to the lower connecting rod or connected by a snap-fitting manner.

[0011] Optionally, the connecting head and the lower connecting rod are connected by a snap-fitting manner, which means that a concave slot is provided at one end of the connecting head facing the lower connecting rod, and a boss is provided at one end of the lower connecting rod facing the connecting head, the boss is inserted into the concave slot, and the boss and the concave slot are rotatably connected.

[0012] Optionally, a specimen reserved opening is formed at one end of the connector away from the lower connecting rod, and the specimen reserved opening is connected to the concrete specimen.

[0013] Optionally, a data transmission port is provided on the middle connecting rod, and a data line of the resistive stress sensor passes through the data transmission port and is connected to an external computer.

[0014] The beneficial effect of the utility model is that the water conservancy project concrete axial tensile preload connection device of the utility model has high working efficiency, stable and reliable data, and automatic intelligence, which improves the accuracy and stability of concrete axial tensile preload control, and also eliminates the interference of human factors on data accuracy and stability, and is particularly suitable for operation by personnel with less test operation experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a structural schematic diagram of a concrete axial tensile preload connection device for a water conservancy project.

[0016] Figure 2 It is an exploded view of the utility model.

[0017] Figure 3 It is an exploded view of the connecting rod in the utility model.

[0018] Figure 4 It is a structural schematic diagram of the connector of the utility model.

[0019] Figure 5 It is a structural schematic diagram of the resistive stress sensor of the utility model.

[0020] Reference numerals:

[0021] Upper connecting rod 1; middle connecting rod 2; lower connecting rod 3; connecting head 4; flat round head pin 5; pin hole 6; upper rotating internal thread 7; lower rotating internal thread 8; specimen reserved opening 9; upper rotating rod 10; lower rotating rod 11; resistive stress sensor 12; concave card slot 13; data transmission port 14. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0023] like Figure 1-Figure 5As shown, the utility model of the water conservancy project concrete axial tensile preload connection device comprises: an upper connecting rod 1, a middle connecting rod 2, a lower connecting rod 3 and a connecting head 4, the upper connecting rod 1 is provided with a pin hole 6, a flat round head pin 5 can be inserted into the pin hole 6, the flat round head pin 5 cooperates with the pin hole 6, and is used to connect the universal testing machine fixture with the water conservancy project concrete axial tensile preload connection device of the present application; the middle connecting rod 2 is detachably connected to the upper connecting rod 1, and a resistive stress sensor 12 is installed in the middle connecting rod 2; the lower connecting rod 3 is detachably connected to the middle connecting rod 2; the connecting head 4 is connected to the lower connecting rod 3.

[0024] The detachable connection is a threaded connection, that is, the upper connecting rod 1 and the middle connecting rod 2, and the middle connecting rod 2 and the lower connecting rod 3 are all connected by threads.

[0025] The pin hole 6 is located at one end of the upper connecting rod 1 , and an upper rotating internal thread 7 is provided on an end surface of the upper connecting rod 1 away from the pin hole 6 .

[0026] An upper rotating rod 10 and a lower rotating rod 11 are respectively provided at both ends of the middle connecting rod 2. The upper rotating rod 10 is connected to the upper connecting rod 1 by threads. The outer surface of the upper rotating rod 10 is an external thread, and the upper rotating internal thread 7 matches the external thread of the upper rotating rod 10.

[0027] like Figure 3 As shown, the middle connecting rod 2 is connected to the upper rotating rod 10 and the lower rotating rod 11 by threads. The end faces of both ends of the middle connecting rod 2 are provided with internal threads, and the outer surfaces of the upper rotating rod 10 and the lower rotating rod 11 are provided with external threads at both ends, and the external threads of the upper rotating rod 10 and the lower rotating rod 11 are matched with the internal threads at both ends of the middle connecting rod 2, so as to connect the middle connecting rod 2 with the upper rotating rod 10 and the lower rotating rod 10.

[0028] The end surface of the lower connecting rod 3 away from the connector 4 is provided with a lower rotating internal thread 8, and the lower connecting rod 3 is threadedly connected to the lower rotating rod 11 on the middle connecting rod 2. The lower rotating internal thread 8 on the lower connecting rod 3 matches the external thread on the lower rotating rod 11.

[0029] The connecting head 4 is fixedly connected to the lower connecting rod 3 or connected by a snap-fitting manner.

[0030] The connecting head 4 and the lower connecting rod 3 are connected by a snap-fitting manner, which means that a concave slot 13 is provided at one end of the connecting head 4 facing the lower connecting rod 3, and a boss is provided at one end of the lower connecting rod 3 facing the connecting head 4, the boss is inserted into the concave slot 13, and the boss and the concave slot 13 are rotationally connected, that is, the boss is rotationally connected to the connecting head 4, and the boss cooperates with the connecting head 4, the diameter of the boss is larger than the diameter of the concave slot 13, so that the boss cannot be detached from the concave slot 13 during the tensile test.

[0031] A specimen reserved opening 9 is formed at one end of the connector 4 away from the lower connecting rod 3 , and the specimen reserved opening 9 is connected to the concrete specimen.

[0032] The resistive stress sensor 12 is fixed inside the middle connecting rod 2 .

[0033] A data transmission port 14 is provided on the middle connecting rod 2 , and a data line of the resistive stress sensor 12 passes through the data transmission port 14 and is connected to an external computer.

[0034] When the utility model is used, two water conservancy project concrete axial tensile preload connection devices need to be prepared, wherein the upper connecting rod 1 of one of the connection devices is connected to the clamp at one end of the universal testing machine through a flat round head pin 5, the specimen reserved opening 9 of the connecting head 4 of the connection device is connected to one end of the concrete specimen, and the other end of the concrete specimen is connected to the specimen reserved opening 9 of the connecting head 4 of another connection device, and the upper connecting rod 1 of the other connection device is connected to the clamp at the other end of the universal testing machine through a flat round head pin 5.

[0035] During the specific connection, a torque electric wrench is used to connect the lower connecting rod 3 with the middle connecting rod 2, and then the middle connecting rod 2 is connected with the upper connecting rod 1. The torque electric wrench is used to control the output torque through the torque control method to ensure that the upper rotating rod 10 and the lower rotating rod 11 are tightened to the required preload. The distance between the middle connecting rod 2 and the upper connecting rod 1 and the lower connecting rod 3 is adjusted by using the upper rotating rod 10 and the lower rotating rod 11, so that the concrete specimen is well connected with the concrete axial tensile preload connection device.

[0036] When conducting an axial tensile test of concrete, first turn on the testing machine and the tensile test software in the computer, set the tensile loading speed of the testing machine to 0.4MPa / min in the tensile test software in the computer, set the preload value to 15% to 20% of the failure load, click the start button, and use the computer tensile test software to make the testing machine perform a pre-tension test. Observe the force value of the computer tensile test software to determine whether the concrete specimen is in an axial tensile state. When the concrete specimen is just in an axial tensile state, clear the initial reading in the computer tensile test software. When the preload value reaches the set preload value, the force value output by the resistive stress sensor 12 in the inner cavity of the middle connecting rod 2 of the concrete axial tensile intelligent preload rotary connection device reaches the preload value set in the computer, and the testing machine automatically stops and unloads after the pre-tensioning is completed.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A hydraulic engineering concrete axial tensile preload connection device, characterized in that: include: An upper connecting rod, wherein a pin hole is provided on the upper connecting rod; A middle connecting rod, wherein the middle connecting rod is detachably connected to the upper connecting rod, and a resistive stress sensor is installed in the middle connecting rod; A lower connecting rod, wherein the lower connecting rod is detachably connected to the middle connecting rod; A connecting head is connected to the lower connecting rod.

2. The hydraulic engineering concrete axial tensile preload connection device according to claim 1 is characterized in that: The detachable connection is a threaded connection.

3. The hydraulic engineering concrete axial tensile preload connection device according to claim 2 is characterized in that: The pin hole is located at one end of the upper connecting rod, and an upper rotating internal thread is arranged on an end surface of the upper connecting rod away from the pin hole.

4. The hydraulic engineering concrete axial tensile preload connection device according to claim 3 is characterized in that: An upper rotating rod and a lower rotating rod are respectively provided at two ends of the middle connecting rod, and the upper rotating rod is connected to the upper connecting rod through threads.

5. The hydraulic engineering concrete axial tensile preload connection device according to claim 4 is characterized in that: The middle connecting rod is connected to the upper rotating rod and the lower rotating rod through threads.

6. The hydraulic engineering concrete axial tensile preload connection device according to claim 5, characterized in that: A lower rotating internal thread is arranged on an end surface of the lower connecting rod away from the connecting head, and the lower connecting rod is connected to the lower rotating rod on the middle connecting rod through threads.

7. The hydraulic engineering concrete axial tensile preload connection device according to claim 1 is characterized in that: The connecting head is fixedly connected to the lower connecting rod or connected by a clamping method.

8. The hydraulic engineering concrete axial tensile preload connection device according to claim 7, characterized in that: The connecting head and the lower connecting rod are connected by a snap-fitting manner, which means that a concave slot is provided at one end of the connecting head facing the lower connecting rod, and a boss is provided at one end of the lower connecting rod facing the connecting head, the boss is inserted into the concave slot, and the boss and the concave slot are rotatably connected.

9. The hydraulic engineering concrete axial tensile preload connection device according to claim 8, characterized in that: A specimen reserved opening is provided at one end of the connector away from the lower connecting rod, and the specimen reserved opening is connected to the concrete specimen.

10. The hydraulic engineering concrete axial tensile preload connection device according to claim 1, characterized in that: The middle connecting rod is provided with a data transmission port, and the data line of the resistive stress sensor passes through the data transmission port and is connected to an external computer.

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