Device and method for testing water pressure in concrete drainage pipe

Abstract

The invention discloses a concrete drainage pipe internal water pressure testing device and method, the concrete drainage pipe internal water pressure testing device comprises a bottom frame, two annular frames, two supporting frames, two supporting discs and a supporting rod, the two annular frames and the two supporting frames are installed on the bottom frame, the two annular frames are located between the two supporting frames and are coaxially arranged, and the supporting discs are arranged on the supporting rods. The supporting rod penetrates through the two annular frames and the two supporting frames and is supported by the two supporting frames. The two supporting discs are fixedly connected to the periphery of the supporting rod and located on the inner peripheries of the two annular frames correspondingly. An inner expansion ring body sleeves the periphery of the supporting disc, the inner expansion ring body is used for abutting against and sealing with the inner periphery of the pipe body, an outer expansion ring body sleeves the inner periphery of the annular frame, the outer expansion ring body is used for abutting against and sealing with the outer periphery of the pipe body, the supporting disc and the inner expansion ring body can jointly seal the end part of the pipe body, and an inner cavity of the pipe body forms a test inner cavity. The water pressure test in the concrete drainage pipe can be stably and effectively realized.

Description

Technical Field

[0001] The invention relates to engineering test equipment, and more specifically, to a device for testing water pressure in a concrete drainage pipe, and also to a method for testing water pressure in a concrete drainage pipe. Background Art

[0002] The internal pressure test of concrete drainage pipes is mainly used to test the performance of the pipes when subjected to internal water pressure, including the pressure bearing capacity, sealing performance, and whether there is leakage or damage. During the test, both ends of the pipe need to be closed to form a relatively closed test cavity inside the middle section of the pipe. During the test, the test cavity of the pipe needs to be filled with a certain pressure. Therefore, in the process of closing both ends of the pipe, a certain end closing pressure needs to be maintained.

[0003] The current concrete pipe internal water pressure test device usually applies pressure to the end faces of the concrete pipe when the ends of the concrete pipe are closed. During the pressure application process, the concrete pipe is subjected to axial pressure from both ends to the middle. Since the concrete pipe has a certain length, when subjected to axial pressure, the concrete pipe may produce a slight bending moment, making the concrete pipe more susceptible to damage when under pressure, affecting the test accuracy of the internal water pressure of the concrete pipe.

[0004] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a device and method for testing the water pressure in a concrete drainage pipe.

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

[0007] A concrete drainage pipe internal water pressure test device comprises a base frame, two annular frames, two support frames, two support plates and a support rod, the two annular frames and the two support frames are both installed on the base frame, the two annular frames are located between the two support frames, and the two annular frames are coaxially arranged, the support rod passes through the two annular frames and the two support frames, and is supported by the two support frames;

[0008] The two support plates are fixedly connected to the outer periphery of the support rod and are respectively located on the inner periphery of the two annular frames, and a gap for accommodating the tube body is formed between the outer periphery of the support plate and the inner periphery of the annular frame;

[0009] The outer periphery of the support plate is provided with an inner expansion ring body, which is used for pressing and sealing against the inner periphery of the tube body; the inner periphery of the annular frame is provided with an outer expansion ring body, which is used for pressing and sealing against the outer periphery of the tube body; the inner and outer expansion ring bodies are arranged relatively to each other; the support plate and the inner expansion ring body can jointly seal the end of the tube body, and the inner cavity of the tube body forms a test cavity.

[0010] The present invention is further configured such that the outer periphery of the support plate forms a first conical surface, the inner periphery of the annular frame forms a second conical surface, and the diameters of the first conical surface and the second conical surface gradually increase toward the middle section of the tube body.

[0011] The present invention is further configured such that the inner expansion ring body is fixedly connected to the first conical surface, and the outer expansion ring body is fixedly connected to the second conical surface.

[0012] The present invention is further configured to further include two connecting pipes 1, and the two connecting pipes 1 are respectively used to connect the inner expansion ring body and the outer expansion ring body on both sides.

[0013] The present invention is further configured to further include a second connecting pipe, wherein the second connecting pipe is located on the inner side of the pipe body and connects the inner expansion ring bodies on both sides.

[0014] The present invention is further configured such that the support rod is hollow inside, the middle section of the inner cavity of the support rod is separated by a block, and the two ends form a lumen section 1 and a lumen section 2 respectively;

[0015] The present invention is further configured such that the piston in the second lumen section is connected to a piston member 1, the piston member 1 is fixedly connected to a piston valve stem, the end of the first lumen section is connected to a hydraulic source, and a third liquid guide hole is provided on the outer wall of the first lumen section;

[0016] The present invention is further configured such that the second lumen section is provided with a liquid guide hole 1 and a liquid guide hole 2 at a position corresponding to the position between the blocking block and the piston member 1; the liquid guide hole 1 is connected to the connecting tube 2 via a connecting tube 1, and the connecting tube 1 is provided with a one-way valve 1, which is unidirectionally conductive toward the connecting tube 2; the liquid guide hole 2 is connected to the liquid guide hole 3 via a connecting tube 2, and the connecting tube 2 is provided with a one-way valve 2, and the one-way valve 2 is unidirectionally conductive toward the liquid guide hole 2.

[0017] The present invention is further configured such that a liquid conducting hole four is provided on the outer wall of the tubular lumen section one, and the liquid conducting hole four can connect the tubular lumen section one and the test inner cavity.

[0018] The present invention is further configured such that the piston in the first lumen section is connected to a second piston component, and the second piston component can be axially slidable and sealed for adjustment along the support rod; a spring is elastically pressed between the second piston component and the blocking block.

[0019] The present invention is further configured such that the spring can elastically maintain the piston member 2 between the liquid guiding hole 3 and the liquid guiding hole 4; by increasing the inner cavity pressure of the lumen section 1, the inner cavity pressure in the lumen section 1 can push the piston member 2 to move toward the block until it passes over the liquid guiding hole 4.

[0020] The present invention also provides a method for measuring the water pressure inside a concrete drainage pipe, using the test device as described above to perform an internal pressure test on the test inner cavity of the pipe body;

[0021] During the test, the pipe body to be tested is sleeved between the support plate and the annular frame, and the positions of the annular frame and the support frame are adjusted. After the adjustment is completed, the positions of the annular frame and the support frame are fixed.

[0022] In the initial state, the outer periphery of the piston part 2 can oppose the liquid guide hole 4, and then the liquid guide hole 4 can be blocked and closed. As shown in the figure, the pressure input by the hydraulic source can first flow from the liquid guide hole 3 to the direction of the tube cavity section 2, and can first pressurize the inner expansion ring body and the outer expansion ring body to expand the pressure, and perform preliminary pressure closure on both sides of the test cavity. Then, during the test, it is necessary to increase the internal pressure of the test cavity according to the advancement of the test. During the pressurization process, the inner cavity of the tube cavity section 1 is gradually increased by gradually increasing the pressure input by the hydraulic source. With the increase of pressure, the water in the tube cavity section 1 can push the piston part 2 to move in the direction of the block, overcoming the elasticity of the spring to maintain the force. Until the water in the tube cavity section 1 can push the piston part 2 to move in the direction of the block, until the piston part 2 opens the liquid guide hole 4, as shown in the figure, the water in the tube cavity section 1 can be passed from the liquid guide hole 4 into the test cavity, and then the pressure water can be passed into the test cavity, and the pressure water can be pressed into the test cavity, and the internal pressure water can be pressed into the test cavity, and the internal pressure test of the test cavity is performed.

[0023] In summary, the present invention has the following beneficial effects:

[0024] During the test, by applying pressure at corresponding positions on the inside and outside of the tube body, a pressure seal can be achieved, and the pressures on the inside and outside are at corresponding positions, which can offset each other and avoid the pressure of the seal from damaging the tube body. In addition, the pressure applied by the inner and outer expansion ring bodies to the tube body is radial pressure, which can avoid applying axial pressure to the tube body, and will not cause bending moment and internal stress damage due to the axial pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional diagram of a water pressure test device in a concrete drainage pipe in this embodiment Figure 1 ;

[0026] Figure 2 A three-dimensional diagram of a water pressure test device in a concrete drainage pipe in this embodiment Figure 2 ;

[0027] Figure 3 is a cross-sectional view of a water pressure test device in a concrete drainage pipe in this embodiment;

[0028] Figure 4 for Figure 3 Middle partial enlarged picture;

[0029] Figure 5 The structure of the support rod in this embodiment is shown in FIG. Figure 1 ;

[0030] Figure 6 The structure of the support rod in this embodiment is shown in FIG. Figure 2 .

[0031] Figure numerals: base frame 1; tube body 100; test cavity 101; annular frame 2; slide seat 1 21; support frame 3; slide seat 2 31; block 32; support rod 4; block 41; tube cavity section 1 42; liquid guide hole 3 421; liquid guide hole 4 422; tube cavity section 2 43; liquid guide hole 1 431; connecting pipe 1 432; one-way valve 1 433; liquid guide hole 2 434; connecting pipe 2 435; one-way valve 2 436; piston member 1 44; piston valve rod 441; piston member 2 45; spring 451; support plate 5; inner expansion ring body 61; conical surface 1 611; outer expansion ring body 62; conical surface 2 621; connecting pipe 1 63; connecting pipe 2 64; three-way joint 65; stop valve 7. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] This embodiment discloses a water pressure test device for a concrete drainage pipe. Figure 1-Figure 6 As shown, it includes a base frame 1, two annular frames 2, two support frames 3, two support plates 5 and support rods 4, and the two annular frames 2 and the two support frames 3 are all installed on the base frame 1.

[0034] A slide 1 21 is fixedly connected to the lower part of the annular frame 2, and a slide 2 31 is fixedly connected to the lower part of the support frame 3. Both the slide 1 21 and the slide 2 31 are slidably connected to the base frame 1, and can be slidably adjusted along the base frame 1. The two annular frames 2 are located between the two support frames 3, and the two annular frames 2 are coaxially arranged, and the sliding direction is along the axis direction of the annular frames 2.

[0035] The support rod 4 passes through the two annular frames 2 and the two support frames 3, and is supported by the two support frames 3. Stoppers 32 are fixedly connected to the support rod 4 at both sides corresponding to the support frames 3. Between the support rod 4 and the support frames 3, two stoppers 32 are used to support and limit.

[0036] The two support plates 5 are fixedly connected to the outer periphery of the support rod 4 and are respectively located at the inner periphery of the two annular frames 2. A gap is formed between the outer periphery of the support plate 5 and the inner periphery of the annular frame 2 for accommodating the tube body 100. The tube body 100 is coaxially installed around the support rod 4 and sleeved in the gap between the support plate 5 and the annular frame 2, and the width of the gap is greater than the wall thickness of the tube body 100.

[0037] Reference Figure 3 As shown, an inner expansion ring body 61 is sleeved on the outer periphery of the support plate 5, and an outer expansion ring body 62 is sleeved on the inner periphery of the annular frame 2. The inner expansion ring body 61 can be pressed and sealed against the inner periphery of the tube body 100, and the outer expansion ring body 62 can be pressed and sealed against the outer periphery of the tube body 100. The positions of the inner expansion ring body 61 and the outer expansion ring body 62 are in an inner and outer relative structure, and the two groups of inner expansion ring bodies 61 and outer expansion ring bodies 62 can form two sections of inner and outer sealing barriers at the two ends of the tube body 100 respectively. At a position near the end of the inner cavity of the tube body 100, the support plate 5 and the inner expansion ring body 61 can jointly close the end of the tube body 100, and the inner cavity of the tube body 100 forms a test inner cavity 101.

[0038] The inner expansion ring body 61 and the outer expansion ring body 62 are both hollow and expandable structures, similar to life buoy structures. By applying pressure to the inner cavities of the inner expansion ring body 61 and the outer expansion ring body 62, elastic expansion can occur, thereby avoiding squeezing with the tube body 100 and achieving a pressure seal to maintain the test inner cavity 101 of the tube body 100 in a sealed state.

[0039] During the test, by applying pressure at corresponding positions inside and outside the tube body 100, a pressurized seal can be achieved, and the pressures inside and outside are at corresponding positions, which can offset each other and avoid the sealing pressure from damaging the tube body 100. Moreover, the pressure applied by the inner expansion ring 61 and the outer expansion ring 62 to the tube body 100 is a radial pressure, which can avoid applying axial pressure to the tube body 100, and will not cause bending moment and internal stress damage due to the axial pressure.

[0040] An appropriate pressure detector may be installed in the test inner cavity 101 to obtain the actual pressure condition of the test inner cavity 101 of the pipe body 100 during the test.

[0041] Reference Figure 4As shown, a conical surface 1 611 is formed on the outer periphery of the support plate 5, and a conical surface 2 621 is formed on the inner periphery of the annular frame 2, and the diameters of the conical surface 1 611 and the conical surface 2 621 are gradually expanded toward the middle section of the tube body 100. The two conical surfaces are arranged corresponding to each other, and in the process of expansion and compression, especially for the inner expansion ring body 61, a force is applied toward the outer sides of the two ends of the tube body 100, and the inclined conical surface can pass through the conical surface 1 611 The force in the direction of the outer periphery can be converted into a part of the axial force in the radial direction on the inner wall of the tube body 100, and the pressure of the support plate 5, the inner expansion ring body 61, the tube body 100, the outer expansion ring body 62 and the annular frame 2 can be maintained, and the support stability can be maintained.

[0042] In addition, the inner expansion ring body 61 is fixedly connected to the conical surface 1 611, and the outer expansion ring body 62 is fixedly connected to the conical surface 2 621, and the two ring bodies are fixed to the corresponding conical surfaces, thereby maintaining the structural stability of the expansion ring and maintaining better stability during the pressure-bearing process.

[0043] In the axial direction, the two support plates 5 are connected and fixed to the outside of the support rod 4 to form an axial limit, which can play a bearing role during the pressure test. Through the axial limit and the structure of the conical surface, a stable seal can be formed for the test cavity 101.

[0044] Reference Figure 4 As shown, the test device in this embodiment also includes two connecting pipes 63, and the two connecting pipes 63 are respectively used to connect the inner expansion ring body 61 and the outer expansion ring body 62 on both sides, that is, the inner expansion ring body 61 and the outer expansion ring body 62 at both sides can be connected, and the internal pressures thereof can be connected to each other to keep the pressure consistent.

[0045] In addition, a second connecting pipe 64 is connected between the two inner expansion ring bodies 61, and the two inner expansion ring bodies 61 can be connected through the second connecting pipe 64 to keep the pressure in the cavities of the ring bodies on both sides consistent, that is, the internal pressure balance of the two inner expansion ring bodies 61 and the two outer expansion ring bodies 62 is consistent. The second connecting pipe 64 is located on the inner side of the pipe body 100, and the second connecting pipe 64 can be hidden on the inner side of the pipe body 100.

[0046] Reference Figure 3 , Figure 4 , Figure 5 As shown, the support rod 4 runs through the interior of the tube body 100, and a pressurized water source can be introduced into the test cavity 101, the inner expansion ring body 61 and the outer expansion ring body 62 through the support rod 4 to maintain the pressure inside the corresponding chamber, thereby achieving pressure sealing and pressure testing.

[0047] The support rod 4 is hollow inside, and the middle section of the inner cavity of the support rod 4 is separated by a block 41, and the inner lumen is divided into left and right ends, forming a lumen section 1 42 and a lumen section 2 43 respectively.

[0048] The piston in the second lumen section 43 is connected to a piston member 44, and the piston member 44 is fixedly connected to a piston valve stem 441. The end of the lumen section 42 is connected to a hydraulic source, and a liquid guide hole 3 421 is opened on the outer wall of the lumen section 42.

[0049] The lumen section 2 43 is provided with a liquid guide hole 1 431 and a liquid guide hole 2 434 at a position corresponding to the position between the blocking block 41 and the piston member 1 44; the liquid guide hole 1 431 is connected to the connecting tube 2 64 via a connecting tube 1 432, and the connecting tube 1 432 is provided with a one-way valve 1 433, which is unidirectionally conductive toward the connecting tube 2 64; the liquid guide hole 2 434 is connected to the liquid guide hole 3 421 via a connecting tube 2 435, and the connecting tube 2 435 is provided with a one-way valve 2 436, which is unidirectionally conductive toward the liquid guide hole 2 434.

[0050] In addition, the outer wall of the lumen section 1 42 is provided with a liquid guide hole 422, which can connect the lumen section 1 42 and the test inner cavity 101. The piston in the lumen section 1 42 is connected to a piston member 2 45, which can slide and seal along the axial direction of the support rod 4; a spring 451 is elastically pressed between the piston member 2 45 and the block 41.

[0051] Reference Figure 5 As shown, the spring 451 can elastically maintain the piston 2 45 between the liquid guide hole 3 421 and the liquid guide hole 4 422. Figure 6 As shown, during the pressurization process, the inner cavity pressure of the lumen section 1 42 increases, and the inner cavity pressure in the lumen section 1 42 can push the piston member 2 45 to move toward the block 41 until it passes over the liquid guide hole 422.

[0052] In this embodiment, the hydraulic source can pass the pressurized water source into the tube lumen section 1 42 of the support rod 4 to provide the pressure for testing and sealing. In addition, in order to achieve pressure blocking, a stop valve 7 can be installed at the end of the tube lumen section 1 42 facing outward, and the pressure between the tube lumen section 1 42 and the hydraulic source can be cut off by the stop valve 7, so that blocking can be achieved during the test to maintain the stability of the pressure.

[0053] This embodiment also discloses a method for testing the internal water pressure of a concrete drainage pipe, which uses a test device as in the above embodiment to perform an internal pressure test on a test inner cavity 101 of a pipe body 100 .

[0054] During the test, the pipe body 100 to be tested is sleeved between the support plate 5 and the annular frame 2, and the positions of the annular frame 2 and the support frame 3 are adjusted. After the adjustment is completed, the positions of the annular frame 2 and the support frame 3 are fixed. Water is introduced into the lumen section 1 42 of the support rod 4 through a hydraulic source. The water in the lumen section 1 42 first enters the connecting pipe 2 435 through the liquid guide hole 3 421, enters the lumen section 2 43 through the one-way conduction of the one-way valve 2 436, and then enters the connecting pipe 2 64 from the lumen section 2 43 through the connecting pipe 1 432 and the one-way valve 1 433. The water source can be introduced into the inner expansion ring body 61 and the outer expansion ring body 62 on both sides through the three-way joint 65;

[0055] The pressure of the water source can drive the inner expansion ring body 61 and the outer expansion ring body 62 to expand outward, and then the inner expansion ring body 61 and the outer expansion ring body 62 can press against each other inside and outside the tube body 100 to seal, and then the test inner cavity 101 in the tube body 100 can be kept sealed. During the sealing process, on the one hand, a pressurized water source can be introduced into the lumen section 1 42, the lumen section 2 43, the inner expansion ring body 61 and the outer expansion ring body 62 through a hydraulic source, and then a sealing pressure is applied to the inner expansion ring body 61 and the outer expansion ring body 62.

[0056] In the initial state, the outer periphery of the piston member 45 can face the liquid guide hole 422, thereby blocking and sealing the liquid guide hole 422. Figure 5 As shown, the pressure input by the hydraulic source can first flow from the liquid guide hole three 421 to the direction of the tubular cavity section two 43, and can first apply pressure to the inner expansion ring body 61 and the outer expansion ring body 62 to expand, and perform preliminary pressure closure on both sides of the test inner cavity 101. Then, during the test, it is necessary to increase the internal pressure of the test inner cavity 101 according to the progress of the test. During the pressurization process, the inner cavity of the tubular cavity section one 42 is gradually increased by gradually increasing the pressure input by the hydraulic source. As the pressure increases, the water in the tubular cavity section one 42 can push the piston member two 45 to move toward the block 41, overcoming the elastic maintaining force of the spring 451. Until the water in the tubular cavity section one 42 can push the piston member two 45 to move toward the block 41, until the piston member two 45 opens the liquid guide hole four 422, refer to Figure 6 As shown, the water in the tubular cavity section 42 can be passed into the test inner cavity 101 through the liquid guide hole 422, and then pressurized water can be introduced into the test inner cavity 101, and pressurized water can be applied to the test inner cavity 101 to perform an internal pressure test on the test inner cavity 101.

[0057] The sealing pressure of the inner cavity of the inner expansion ring body 61 and the outer expansion ring body 62 is greater than the internal pressure of the test cavity 101, and as the internal pressure of the test cavity 101 increases, the pressure of the inner expansion ring body 61 and the outer expansion ring body 62 needs to be further increased to maintain the sealing pressure. When the inner expansion ring body 61 and the outer expansion ring body 62 need to be pressurized, the piston valve stem 441 can be driven by the driver to reciprocate and telescopically move, thereby pushing the piston member 1 44 to slide back and forth, and the pressure water source in the lumen section 2 43 can be further pushed into the connecting pipe 2 64, and the inner expansion ring body 61 and the outer expansion ring body 62 can be further pressurized. By increasing the pressure of the inner expansion ring body 61, the outer expansion ring body 62 and the tube wall of the tube body 100, the sealing pressure between the corresponding ring body and the tube wall of the tube body 100 can be maintained to maintain the sealing stability of the test cavity 101, and when the internal pressure of the test cavity 101 increases, the stability of the test cavity 101 can be maintained.

[0058] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A water pressure test device for a concrete drainage pipe, characterized in that: The invention comprises a base frame (1), two annular frames (2), two support frames (3), two support plates (5) and a support rod (4); the two annular frames (2) and the two support frames (3) are all mounted on the base frame (1); the two annular frames (2) are located between the two support frames (3); the two annular frames (2) are coaxially arranged; the support rod (4) passes through the two annular frames (2) and the two support frames (3) and is supported by the two support frames (3); Two support plates (5) are fixedly connected to the outer periphery of the support rod (4) and are respectively located on the inner periphery of the two annular frames (2), and a gap for accommodating the tube body (100) is formed between the outer periphery of the support plate (5) and the inner periphery of the annular frame (2); The outer periphery of the support plate (5) is provided with an inner expansion ring body (61), which is used to press and seal against the inner periphery of the tube body (100); the inner periphery of the annular frame (2) is provided with an outer expansion ring body (62), which is used to press and seal against the outer periphery of the tube body (100); the inner and outer expansion ring bodies (61) and (62) are arranged relative to each other; the support plate (5) and the inner expansion ring body (61) can jointly seal the end of the tube body (100), and the inner cavity of the tube body (100) forms a test cavity (101).

2. The water pressure test device in a concrete drainage pipe according to claim 1, characterized in that: The outer periphery of the support plate (5) forms a conical surface 1 (611), and the inner periphery of the annular frame (2) forms a conical surface 2 (621), and the diameters of the conical surface 1 (611) and the conical surface 2 (621) gradually increase toward the middle section of the tube body (100).

3. The water pressure test device in a concrete drainage pipe according to claim 2, characterized in that: The inner expansion ring body (61) is fixedly connected to the first conical surface (611), and the outer expansion ring body (62) is fixedly connected to the second conical surface (621).

4. The water pressure test device in a concrete drainage pipe according to claim 1, characterized in that: It also includes two connecting pipes (63), and the two connecting pipes (63) are respectively used to connect the inner expansion ring body (61) and the outer expansion ring body (62) on both sides.

5. The water pressure test device in a concrete drainage pipe according to claim 4, characterized in that: It also includes a second connecting pipe (64), which is located inside the pipe body (100) and connects the inner expansion ring bodies (61) on both sides.

6. The water pressure test device in a concrete drainage pipe according to claim 1, characterized in that: The support rod (4) is hollow inside, the middle section of the inner cavity of the support rod (4) is separated by a block (41), and the two ends form a lumen section 1 (42) and a lumen section 2 (43) respectively; The piston in the second lumen section (43) is connected to a piston member (44), the piston member (44) is fixedly connected to a piston valve stem (441), the end of the first lumen section (42) is connected to a hydraulic source, and the outer wall of the first lumen section (42) is provided with a liquid guide hole (421); The second lumen section (43) is provided with a first liquid guide hole (431) and a second liquid guide hole (434) at a position corresponding to the position between the blocking block (41) and the first piston member (44); the first liquid guide hole (431) is connected to the second connecting pipe (64) via a connecting pipe (432); the first connecting pipe (432) is provided with a first check valve (433); the first check valve (433) is unidirectionally conducted in the direction of the second connecting pipe (64); the second liquid guide hole (434) is connected to the third liquid guide hole (421) via a connecting pipe (435); the second connecting pipe (435) is provided with a second check valve (436); the second check valve (436) is unidirectionally conducted in the direction of the second liquid guide hole (434).

7. The water pressure test device in a concrete drainage pipe according to claim 6, characterized in that: The outer wall of the tubular lumen section one (42) is provided with a liquid conducting hole four (422), and the liquid conducting hole four (422) can connect the tubular lumen section one (42) and the test inner cavity (101).

8. The water pressure test device in a concrete drainage pipe according to claim 7, characterized in that: The piston in the first lumen section (42) is connected to a second piston member (45), and the second piston member (45) can be axially slidable and sealed along the support rod (4) for adjustment; a spring (451) is elastically pressed between the second piston member (45) and the blocking block (41).

9. The water pressure test device in a concrete drainage pipe according to claim 8, characterized in that: The spring (451) can elastically maintain the piston member 2 (45) between the liquid guide hole 3 (421) and the liquid guide hole 4 (422); by increasing the inner cavity pressure of the tubular cavity section 1 (42), the inner cavity pressure in the tubular cavity section 1 (42) can push the piston member 2 (45) to move toward the block (41) until it passes over the liquid guide hole 4 (422).

10. A method for measuring water pressure in a concrete drainage pipe, characterized in that: The test device as claimed in any one of claims 1 to 9 is used to perform an internal pressure test on a test inner cavity (101) of a pipe body (100).

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