Pressure test device for concrete pipeline

Abstract

The invention provides a concrete pipeline pressure test device which comprises a test box and a gas tank, a support frame, a fixing plate and a pressing plate are arranged in the test box, the fixing plate is provided with a first vent hole, and the pressing plate is mounted on a push rod of a transverse push element; an outlet of the gas tank is provided with a one-inlet two-outlet three-way valve, one outlet is connected with a first branch pipe, the first branch pipe is communicated with the first vent hole of the fixed plate, the other outlet is connected with a second branch pipe, and the second branch pipe extends into the test box. The gas tank selectively inflates a gas source into the test box and the concrete sample pipe to simulate the stress condition of the concrete pipeline in use, and a pressure test is performed on the concrete pipeline under the condition, so that the pressure test accuracy of the concrete pipeline is improved, and the construction requirements of different application scenes are met.

Description

Technical Field

[0001] The invention belongs to the field of concrete quality detection, and in particular relates to a concrete pipe pressure resistance test device. Background Art

[0002] Concrete refers to a general term for engineering composite materials that are made of cement, sand, stone, etc. mixed with water. It is widely used. For example, pipes cast with concrete are widely used in municipal water supply, sewage disposal and other fields.

[0003] Before the construction of concrete pipes, it is necessary to test their pressure resistance to determine their air tightness and impermeability. Currently, the samples used for the pressure resistance test of concrete pipes are block structures, such as Figure 1 As shown, the pressure head is used to pressurize the vertical sample 16 to a set pressure, and the entire block sample is subjected to vertical force, the magnitude and direction of the force are the same, and the pressure is maintained for a certain period of time, and then the sample is tested for cracks, crack size, extension direction, etc., to obtain the pouring quality of the concrete. However, since the wall of the concrete pipe is round, the force it receives during use comes from the pressure of the conveying medium, such as the pressure from the internal medium high-pressure water when used in water conservancy projects. Figure 2 As shown, the medium pressure direction of each point of the concrete pipe 17 is different, and each is subjected to radial force; and for buried pipe construction, the concrete pipe is also subjected to the pressure of the surrounding fill, which is also ultimately decomposed into radial force, and these two pressures act on the concrete pipe in a circle. Therefore, in the test of testing the pressure resistance of concrete pipes by vertically pressurizing the sample block, the force on the sample block cannot truly reflect the stress condition of the pipeline. Therefore, there are problems such as large test result errors and inaccurate results when testing the pressure resistance of concrete pipes by vertically pressurizing the sample block. Summary of the invention

[0004] In view of this, the present invention aims to provide a concrete pipe pressure resistance test device to improve the accuracy of the concrete pipe pressure resistance test.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows: A concrete pipe pressure test device, comprising: A test box, wherein the top of the test box is opened, the opening is sealed with a box cover, a fixed plate and a pressing plate are arranged opposite to each other in the test box, a first vent hole is arranged through the fixed plate, a support frame is arranged between the fixed plate and the pressing plate, a transverse pushing element is arranged in the test box corresponding to the pressing plate, and the pressing plate is installed on a push rod of the transverse pushing element; A gas tank is arranged outside the test box, and a one-inlet and two-outlet three-way valve is arranged at the outlet of the gas tank, one of the outlets of the one-inlet and two-outlet three-way valve is connected to a first branch pipe, the first branch pipe is connected to a first vent hole of a fixed plate, the other outlet of the one-inlet and two-outlet three-way valve is connected to a second branch pipe, and the second branch pipe extends into the test box.

[0006] Furthermore, the fixing plate is a wall of the test box.

[0007] Furthermore, first sealing gaskets are respectively provided on the opposite sides of the fixing plate and the pressure plate, and a second sealing gasket is provided between the box cover and the test box.

[0008] Furthermore, a slide rail corresponding to the pressing plate is arranged at the bottom of the test box, and the pressing plate and the slide rail are slidably connected.

[0009] Furthermore, the support frame is a V-shaped block.

[0010] Furthermore, the one-inlet-two-outlet three-way valve is a solenoid valve.

[0011] Furthermore, pressure sensors are provided in the first branch pipe and the second branch pipe.

[0012] Furthermore, the transverse thrust element is a hydraulic cylinder.

[0013] Furthermore, the device is arranged in a foundation pit, and a cover plate is arranged corresponding to the foundation pit.

[0014] Compared with the prior art, the concrete pipe pressure test device described in the present invention has the following advantages: (1) In the present invention, the gas tank can selectively fill the test box and the concrete sample pipe with gas source to simulate the stress condition of the concrete pipe in use, and perform a pressure test on it under this condition, thereby improving the accuracy of the pressure test of the concrete pipe and meeting the construction requirements of different application scenarios.

[0015] (2) The present invention is arranged in a foundation pit, and a concrete sample pipe is arranged in a test box for a pressure test, so as to prevent the debris generated by the high-pressure crushing of unqualified concrete sample pipes from splashing and injuring the operators, thereby improving the safety of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is the force diagram of the sample block when the sample block is currently used to test the pressure resistance of concrete pipes; Figure 2 It is the actual stress state diagram of the concrete pipe; Figure 3A schematic diagram of a concrete pipe pressure test device according to an embodiment of the present invention; Description of reference numerals: 1-foundation pit; 2-cover plate; 3-first branch pipe; 4-three-way valve with one inlet and two outlets; 5-second branch pipe; 6-test box; 61-box wall, 62-box cover; 63-first air vent; 64-second air vent; 7-concrete sample pipe; 8-pressure plate; 9-transverse push element; 10-first sealing gasket; 11-slide rail; 12-base; 13-support frame; 14-gas tank; 15-second sealing gasket; 16-sample block; 17-concrete pipe. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0018] like Figure 3 As shown, a concrete pipe pressure test device comprises a foundation pit 1, a cover plate 2 is arranged corresponding to the foundation pit 1, a test box 6 and a gas tank 14 are arranged in the foundation pit 1, wherein the gas tank 14 is arranged outside the test box 6. The pressure resistance of the concrete sample pipe is tested in the foundation pit 1 to prevent the concrete sample pipe from breaking and splashing due to unqualified pouring during the test, which may cause safety problems. The specific structure is: A base 12 is arranged in the foundation pit 1, and a test box 6 is fixed to the base 12. The test box 6 is preferably a steel plate box, and reinforcement beams are arranged horizontally and vertically on the outer surface of the steel plate box. A box cover 62 is arranged at the top opening and the opening of the test box. The box cover 62 and the test box 6 are connected and fixed by screws. The box cover 62 can be provided with an exhaust valve (not drawn in the figure) to exhaust and reduce the pressure of the high-pressure gas pressurized on the outside of the concrete sample tube in the test box after the test. A second sealing gasket 15 is arranged between the box cover 62 and the test box 6 to ensure the sealing of the test box 6. A fixed plate and a pressing plate 8 are arranged opposite to each other in the test box 6. Preferably, a box wall 61 of the test box 6 is used as a fixed plate, and the fixed plate is penetrated to provide a first vent hole 63 and a second vent hole 64, wherein the first vent hole 63 is opposite to the center of the pressing plate 8, and the second vent hole 64 is arranged away from the first vent hole 63. The fixed plate can be provided with an exhaust valve (not shown in the figure) near the first vent hole 63, so as to exhaust and reduce the pressure of the pressurized concrete sample tube inside after the test. The test box 6 is provided with a support frame 13 between the fixed plate and the pressure plate 8. The support frame 13 is preferably a V-shaped block structure for supporting the concrete sample tube. The corresponding pressure plate 8 in the test box 6 is provided with a horizontal push element 9. The horizontal push element 9 is preferably a hydraulic cylinder and is installed on the corresponding box wall 61 of the test box 6. The push rod of the horizontal push element 9 is connected and fixed to the pressure plate 8. The push rod of the horizontal push element 9 extends to drive the pressure plate 8 to move toward the fixed plate, and works together with the fixed plate to press, seal and fix the concrete sample tube supported on the support frame 13.

[0019] The outlet of the gas tank 14 is provided with a one-in-two-out three-way valve 4, which is a solenoid valve, and one of the outlets of the one-in-two-out three-way valve 4 is connected to the first branch pipe 3, which is connected to the first vent hole 63 of the fixed plate, so that the gas tank 14 can pass a certain pressure of gas into the concrete sample tube on the support frame 13; the other outlet of the one-in-two-out three-way valve 4 is connected to the second branch pipe 5, which is connected to the second vent hole 64, so that the gas tank 14 can pass a certain pressure of gas into the test box 6 and outside the concrete sample tube. In the present invention, pressure sensors are respectively provided in the first branch pipe 3 and the second branch pipe 5.

[0020] In the present invention, grooves are respectively provided on the opposite sides of the fixing plate and the pressure plate 8, and a first sealing gasket 10 is respectively provided in each groove. The first sealing gasket 10 is preferably a ring structure. When the concrete sample pipe is subjected to a pressure test, the two ends of the concrete sample pipe are respectively sealed by the first sealing gasket 10 to prevent gas from flowing and leaking between the inside and outside of the concrete sample pipe, thereby improving the accuracy of the pressure test.

[0021] In the present invention, a slide rail 11 corresponding to the pressing plate 8 is arranged at the bottom of the test box 6, and a slide groove is provided at the bottom of the pressing plate 8 corresponding to the slide rail 11. The slide groove and the slide rail 11 form a sliding pair to improve the linearity of the movement of the pressing plate 8.

[0022] During the pressure test of concrete pipes, for example, for the pressure test of high-pressure medium flowing inside the pipe, the concrete sample pipe 7 is placed on the support frame 13, one end of which abuts against the fixed plate, and the pressure plate 8 moves forward until the concrete sample pipe is pressed and fixed. At this time, the two ends of the concrete sample pipe 7 are sealed by the first sealing gasket 10 respectively, and the box cover 62 is covered and fixed, and then the one-in-two-out three-way valve 4 is opened, so that the first vent hole 63 and the gas tank 14 are connected, and a certain pressure of gas is introduced into the concrete sample pipe 7, and the pressure is maintained for a certain time, and then the test box 6 is opened, the pressure plate 8 is moved back, and the concrete sample pipe 7 is taken out to detect whether there are cracks, the size of the cracks, the extension direction, etc., to determine whether the casting quality of the concrete pipe is qualified. In the same principle, a certain pressure of gas can be input into the test box 6 through the second vent hole 64, and the concrete sample pipe 7 in the test box 6 is pressurized from the outside to obtain the pressure resistance performance of the concrete pipe when it is under pressure from the outside.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A concrete pipe pressure test device, characterized in that: include: The test box (6) has an opening at the top, and a box cover (62) is provided to seal the opening. A fixed plate and a pressing plate (8) are provided opposite to each other in the test box (6). A first vent hole (63) is provided through the fixed plate. A support frame (13) is provided between the fixed plate and the pressing plate (8). A transverse pushing element (9) is provided in the test box (6) corresponding to the pressing plate (8), and the pressing plate (8) is installed on a push rod of the transverse pushing element (9). A gas tank (14) is arranged outside the test box (6); a one-inlet, two-outlet three-way valve (4) is arranged at the outlet of the gas tank (14); one of the outlets of the one-inlet, two-outlet three-way valve (4) is connected to a first branch pipe (3); the first branch pipe (3) is connected to a first vent hole (63) of a fixed plate; the other outlet of the one-inlet, two-outlet three-way valve (4) is connected to a second branch pipe (5); and the second branch pipe (5) extends into the test box (6).

2. A concrete pipe pressure test device according to claim 1, characterized in that: The fixing plate is a box wall (61) of the test box (6).

3. A concrete pipe pressure test device according to claim 1, characterized in that: The fixing plate and the pressing plate (8) are respectively provided with first sealing gaskets (10) on the opposite sides thereof, and a second sealing gasket (15) is provided between the box cover (62) and the test box (6).

4. A concrete pipe pressure test device according to claim 1, characterized in that: The bottom of the test box (6) is provided with a slide rail (11) corresponding to the pressing plate (8), and the pressing plate (8) and the slide rail (11) are slidably connected.

5. A concrete pipe pressure test device according to claim 1, characterized in that: The support frame (13) is a V-shaped block.

6. A concrete pipe pressure test device according to claim 1, characterized in that: The one-inlet-two-outlet three-way valve (4) is a solenoid valve.

7. A concrete pipe pressure test device according to claim 1, characterized in that: The first branch pipe (3) and the second branch pipe (5) are respectively provided with pressure sensors.

8. A concrete pipe pressure test device according to claim 1, characterized in that: The transverse thrust element (9) is a hydraulic cylinder.

9. A concrete pipe pressure test device according to claim 1, characterized in that: The device is arranged in a foundation pit (1), and a cover plate (2) is arranged corresponding to the foundation pit (1).

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