Single-pipe hydraulic double-water-stop plug and water pressure test device

Abstract

The present invention relates to the technical field of geological engineering survey equipment, and discloses a single-pipe water-pressure double-water-stop plug device. In the present invention, an upper water-stop plug and a lower water-stop plug are respectively arranged at the upper and lower ends of the water pressure test section. The first capsule and the second capsule are communicated through a connecting pipe, so that the water injection of the two capsules is carried out synchronously, and at the same time, they are attached to the hole wall, and a test section with better isolation effect can be formed, making the measured rock mass permeability coefficient more accurate; by controlling the movement of the support pipe, the inner cavity of the support pipe is communicated with the capsule, and the inner cavity of the support pipe is communicated with the test section pipe, and the two states are positioned and switched through the first annular boss, the second annular boss and the third annular boss, so as to realize the positioning control of the first piston pipe, which is convenient for separately injecting water into the capsule and the test section pipe, reducing the operation difficulty and being simple to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of geological engineering survey equipment, and particularly relates to a single-pipe water-pressure type double water-stop plug and a water pressure test device. Background Art

[0002] The water pressure test is an important work content in the survey and design of hydropower projects, and is the most intuitive technical means to obtain the permeability coefficient of rock masses. It provides the most basic data for evaluating the permeability characteristics of rock masses and designing seepage control measures. Generally, the test pressure less than 1.0 MPa is a conventional water pressure test, and the test pressure greater than 1.0 MPa is a high-pressure water pressure test. Among them, the water-stop plug is a key device for the water pressure test, especially the water isolation effect of the water-stop plug in the high-pressure water pressure test has a great impact on the test results of the water pressure test.

[0003] At present, the water-stop plugs used in China include double-pipe circulation type, single-pipe top-pressure type, water-pressure type, oil-pressure type, air-pressure type, etc. The single-pipe top-pressure rubber plug is the most widely used equipment in the hydropower and water conservancy industries at present, and has the advantages of simple structure and easy operation. However, there are problems such as unsatisfactory sealing. Especially in the case of incomplete borehole walls in soft rock formations or more fractured formations, downhole accidents are likely to occur, and the rubber plug is overly deformed and stuck in the hole, and the water-stop plug is easily stuck. The capsule of the water-pressure type plug is easily in close contact with the borehole wall, and even in the case of an uneven borehole wall, surface contact can be achieved, and the water-stop reliability is good. It can adapt to boreholes with different diameters and depths, and the operation is relatively convenient. However, the commonly used equipment at present uses a single plug to isolate the test section, and the isolation is not good. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a single-pipe water-pressure type double water-stop plug and a water pressure test device that improve the test effect.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a single-pipe water pressure double water stop plug, including an upper water stop plug, a test section pipe, and a lower water stop plug arranged in sequence from top to bottom. The test section pipe is fixedly connected to the upper water stop plug and the lower water stop plug respectively, and a plurality of water inlet holes are arranged on the outer periphery of the test section pipe; the upper water stop plug includes a first cylinder body, a first piston pipe, and a first capsule. The bottom end of the first piston pipe is closed, the first piston pipe is placed in the inner cavity of the first cylinder body and is slidably connected thereto. The first capsule is fixedly arranged on the outer periphery of the first cylinder body. A first channel connecting to the inlet of the first capsule is arranged on the side wall of the first cylinder body, and a second channel is arranged at the bottom of the first piston pipe; the inner cavity of the first cylinder body includes a first cavity and a second cavity. The first cavity is located above the second cavity. The inner diameter of the second cavity is larger than the outer diameter of the first piston pipe. The first channel is arranged at the position corresponding to the side wall of the first cylinder body in the first cavity. When the second channel of the first piston pipe is placed in the first cavity, the first piston pipe and the first cavity form a sealed structure, and the first piston pipe and the first capsule are communicated through the first channel and the second channel; the lower water stop plug includes a second cylinder body and a second capsule. One end of the test section pipe is connected to the bottom outlet of the first cylinder body, the second cavity is communicated with the test section pipe through the bottom outlet of the first cylinder body, the other end of the test section pipe is connected to the top inlet of the second cylinder body, and the bottom of the second cylinder body is a sealed structure. When the second channel of the first piston pipe is placed in the second cavity, the first piston pipe is communicated with the test section pipe; a first connecting channel connected to the first channel is arranged along the axial direction on the side wall of the first cylinder body, a second connecting channel is arranged along the axial direction on the side wall of the second cylinder body, and a connecting pipe connecting the two is arranged between the first connecting channel and the second connecting channel; the second capsule is fixedly arranged on the outer periphery of the second cylinder body, and a third channel connecting the two is arranged between the second connecting channel and the inlet of the second capsule.

[0006] Further: a first annular boss is arranged at the bottom end of the first piston pipe, an inwardly protruding second annular boss is arranged on the inner side wall between the first cavity and the second cavity. The inner diameter of the second annular boss is adapted to the outer diameter of the first piston pipe, the outer diameter of the first annular boss is adapted to the inner diameter of the first cylinder body, and the first annular boss is placed below the second annular boss. When the first annular boss abuts against the second annular boss, the second channel corresponds to the first channel.

[0007] Further: the outer diameter of the first piston pipe is smaller than the inner diameter of the first cavity. A fixed ring sleeve is fixedly arranged on the outer peripheral surface of the first piston pipe, and the first piston pipe is slidably connected to the first cylinder body through the fixed ring sleeve.

[0008] Further: a third annular boss protruding outward is arranged on the outer periphery of the first piston pipe. The third annular boss is placed above the top end of the first cylinder body. When the third annular boss abuts against the top end of the first cylinder body, the second channel of the first piston pipe is located in the second cavity.

[0009] Furthermore: The inner diameter of the first cavity is the same as that of the second cavity. A third cavity smaller than the inner diameter of the first cavity is provided between the first cavity and the second cavity. The inner diameter of the third cavity is adapted to the outer diameter of the first piston tube. An annular plug is fixedly provided at the top of the first cavity. The position of the annular plug is higher than the position of the first channel. The annular plug is located between the first cavity and the first piston tube and is slidably connected to the first piston tube.

[0010] Furthermore: The first capsule is sleeved on the outer periphery of the first cylinder body, and the top and bottom ends of the first capsule are respectively fixedly connected to the first cylinder body; the second capsule is sleeved on the outer periphery of the second cylinder body, and the top and bottom ends of the second capsule are respectively fixedly connected to the second cylinder body.

[0011] Furthermore: A piezometer for measuring the pressure of the water pressure test section is provided on the outer side wall of the test section pipe.

[0012] To solve its technical problems, the present invention also provides a water pressure test device, which includes a water pressure device, a water delivery pipe, a support pipe and a support device, and also includes the single-pipe water pressure type double water stop plugs. The support pipe is vertically arranged, and the support device is used to hoist the support pipe. The water outlet of the water pressure device is connected to the water inlet of the support pipe through the water delivery pipe. A flow meter and a pressure gauge are arranged on the water delivery pipe. The bottom end of the support pipe is fixedly connected to the top end of the first piston tube.

[0013] Furthermore: The support device includes a support frame, a suspension rope and a driving device for driving the suspension rope to lift. The driving device is fixedly arranged on the support frame. One end of the suspension rope is fixedly connected to the top of the support pipe, and the other end of the suspension rope is fixedly connected to the output end of the driving device.

[0014] The beneficial effects of the present invention are:

[0015] 1. An upper water stop plug and a lower water stop plug are respectively arranged at the upper and lower ends of the test section pipe. The first capsule and the second capsule are communicated through a connecting pipe, so that the water injection of the two capsules is carried out synchronously, and at the same time, they are attached to the hole wall, and a test section with better isolation effect can be formed, making the measured rock mass permeability coefficient more accurate;

[0016] 2. By controlling the movement of the support pipe, the inner cavity of the support pipe is communicated with the capsule, and the inner cavity of the support pipe is communicated with the test section pipe. And the two states are switched by positioning through the first annular boss, the second annular boss and the third annular boss, realizing the positioning control of the first piston tube, facilitating the separate water injection of the capsule and the test section pipe, reducing the operation difficulty and being simple to operate.

[0017] 3. In the present invention, the water pressure test device measures the rock mass permeability coefficient through the single-pipe water pressure type double water stop plugs, has a better isolation effect, and the measured rock mass permeability coefficient is more accurate; and the device is simple to operate and easy to implement. Description of the Drawings

[0018] Figure 1 Schematic diagram of a single - pipe water - pressure double - water - stop plug device;

[0019] Figure 2 Cross - sectional view one of the internal structures of the upper water - stop plug and the lower water - stop plug;

[0020] Figure 3 Cross - sectional view two of the internal structures of the upper water - stop plug and the lower water - stop plug;

[0021] Figure 4 Schematic diagram one of the structure of the first cylinder body;

[0022] Figure 5 Schematic diagram two of the structure of the first cylinder body.

[0023] The markings in the figure are: 1 water - pressure device; 2 flowmeter; 3 pressure gauge; 4 water delivery pipe; 5 support pipe; 6 upper water - stop plug; 7 lower water - stop plug; 8 test - section pipe; 9 connecting pipe; 10 fixed ring sleeve; 11 support frame; 12 lifting rope; 61 first cylinder body; 611 first channel; 612 first connecting channel; 613 second annular boss; 62 first piston pipe; 621 third annular boss; 622 first annular boss; 63 first capsule; 71 second cylinder body; 711 third channel; 712 second connecting channel; 72 second piston pipe; 73 second capsule. Detailed implementation manners

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In this article, "parallel", "perpendicular", etc. are not strict mathematical and / or geometric limitations, and also include the allowable errors that those skilled in the art can understand and that are allowed during manufacturing or use.

[0025] The present invention will be further described below in conjunction with the drawings and specific implementation manners.

[0026] As Figure 1The water pressure test device of the present invention shown in the figure includes a water pressure device 1, a water delivery pipe 4, a support device, a support pipe 5, and a single-pipe water pressure double-packer. The support pipe 5 is vertically arranged. The support device includes a support frame 11, a suspension rope 12, and a driving device for driving the lifting of the suspension rope 12. The driving device is fixedly arranged on the support frame 11. One end of the suspension rope 12 is fixedly connected to the support pipe 5 for hoisting it, and the other end of the suspension rope 12 is fixedly connected to the output end of the driving device. The water pressure device 1 applies pressure to the water and presses the water into the support pipe 5. The water outlet of the water pressure device 1 is connected to the water inlet of the support pipe 5 through the water delivery pipe 4. A parameter flowmeter 2 for testing the water flow in the pipeline and a pressure gauge 3 are arranged on the water delivery pipe 4.

[0027] The single-pipe water pressure double-packer includes an upper packer 6, a test section pipe 8, and a lower packer 7 arranged in sequence from top to bottom. The test section pipe 8 is fixedly connected to the upper packer 6 and the lower packer 7 respectively. A plurality of water inlet holes are arranged on the outer periphery of the test section pipe 8; as Figure 2 and Figure 3 shown, the upper packer 6 includes a first cylinder body 61, a first piston pipe 62, and a first capsule 63. The bottom end of the first piston pipe 62 is closed, and the top end of the first piston pipe 62 is fixedly connected to the bottom end of the support pipe 5. The first piston pipe 62 is placed in the inner cavity of the first cylinder body 61 and is slidably matched with it. The first capsule 63 is fixedly arranged on the outer periphery of the first cylinder body 61. A first channel 611 connecting to the inlet of the first capsule 63 is arranged on the side wall of the first cylinder body 61. A second channel is arranged at the bottom of the first piston pipe 62. The inner cavity of the first cylinder body 61 includes a first cavity and a second cavity. The first cavity is located above the second cavity. The inner diameter of the second cavity is larger than the outer diameter of the first piston pipe 62. The first channel 611 is arranged at the position of the first cavity corresponding to the side wall of the first cylinder body 61; as Figure 2 shown, when the second channel of the first piston pipe 62 is placed in the first cavity, the first piston pipe 62 and the first cavity form a sealed structure, and the first piston pipe 62 and the first capsule 63 are communicated through the first channel 611 and the second channel;

[0028] The lower packer 7 includes a second cylinder body 71 and a second capsule 73. One end of the test section pipe 8 is connected to the bottom outlet of the first cylinder body 61. The second cavity is communicated with the test section pipe 8 through the bottom outlet of the first cylinder body 61. The other end of the test section pipe 8 is connected to the top inlet of the second cylinder body 71. The bottom of the second cylinder body 71 is a sealed structure; as Figure 3 shown, when the second channel of the first piston pipe 62 is placed in the second cavity, the first piston pipe 62 is communicated with the test section pipe 8;

[0029] On the side wall of the first cylinder block 61, a first connecting channel 612 connected to the first channel 611 is arranged along its axial direction. On the side wall of the second cylinder block 71, a second connecting channel 712 is arranged along its axial direction. A connecting pipe 9 for connecting the two is arranged between the first connecting channel 612 and the second connecting channel 712. The second capsule 73 is fixedly arranged on the outer periphery of the second cylinder block 71. A third channel 711 for connecting the two is arranged between the second connecting channel 712 and the inlet of the second capsule 73.

[0030] In the present invention, the first piston tube 62 has two position states. The first state is that the second channel communicates with the first channel 611 in the first cavity. At this time, a sealed area is formed between the inner side wall of the first cylinder block 61 and the outer side wall of the first piston tube 62. There is only a channel for water flow to be injected from the first piston tube 62 into the first capsule 63 in the sealed area, and the water flow cannot flow out between other structural members. The second state is that the second channel is in the second cavity and communicates with the test section tube 8. Since the bottom of the second cylinder block 71 is a sealed structure, the water flow can only flow out from the water inlet hole of the test section tube 8. Therefore, the first cylinder block 61 can be Figure 2 , Figure 4 or Figure 5 the structural patterns shown in, and of course, it is not only the structures mentioned in the present invention. As long as the structure can achieve the above functions, it is applicable to the present invention.

[0031] Working principle:

[0032] The support tube 5 is arranged in the drill hole. The water pressure device 1 injects water into the support tube 5. The water flow enters the first piston tube 62 through the support tube 5. The second channel of the first piston tube 62 is lowered to the corresponding position of the first channel 611 of the first cylinder block 61. The first piston tube 62 and the first capsule 63 are communicated through the first channel 611 and the second channel. The water flow enters the first capsule 63 and then flows into the second capsule 73 through the connecting pipe 9. Both the first capsule 63 and the second capsule 73 expand laterally until they are in close contact with the drill hole wall. After the expansion of the first capsule 63 and the second capsule 73 is completed, the first cylinder block 61 and the second cylinder block 71 are fixed at this position. Under the combined upper and lower sealing effects of the first capsule 63 and the second capsule 73, the water pressure test section is in a sealed state. Then, the first piston tube 62 is further lowered into the second cavity of the first cylinder block 61. The first piston tube 62 and the test section tube 8 are communicated through the second channel. The water flow enters the test section tube 8 from the first piston tube 62 and then is injected into the space between the rock formation and the test section tube 8 through the water inlet hole. When the water flow pressure and water flow rate reach the corresponding states, record the test pressure and flow rate at this time, and then obtain the permeability parameters of this section of the rock mass.

[0033] Specifically, in order to enable the second channel to communicate and cooperate with the first channel 611 and facilitate the positioning of the movement of the first piston tube 62, a first annular boss 622 is provided at the bottom end of the first piston tube 62. An inwardly protruding second annular boss 613 is provided on the inner side wall between the first cavity and the second cavity. The inner diameter of the second annular boss 613 is adapted to the outer diameter of the first piston tube 62, and the outer diameter of the first annular boss 622 is adapted to the inner diameter of the first cylinder 61. Moreover, the first annular boss 622 is placed below the second annular boss 613. When the first annular boss 622 abuts against the second annular boss 613, the second channel corresponds to the first channel 611, and the first piston tube 62 communicates with the first capsule 63.

[0034] Specifically, in order to facilitate the sliding fit between the first piston tube 62 and the inner cavity of the first cylinder 61, the outer diameter of the first piston tube 62 is smaller than the inner diameter of the first cavity. A fixed ring sleeve 10 is fixedly provided on the outer peripheral surface of the first piston tube 62. The fixed ring sleeve 10 is arranged above the second channel. The first piston tube 62 is slidably connected to the first cylinder 61 through the fixed ring sleeve 10. It should be understood that the fixed ring sleeve 10 is made of a water-impermeable material and has good wear resistance, and can adapt to the corresponding working environment.

[0035] Specifically, in order to facilitate the second channel to enter a specified position in the second cavity, a third annular boss 621 protruding outward is provided on the outer periphery of the first piston tube 62. The third annular boss 621 is placed above the top end of the first cylinder 61. When the third annular boss 621 abuts against the top end of the first cylinder 61, the second channel of the first piston tube 62 is located in the second cavity.

[0036] Another embodiment of the present invention is as Figure 5 shown. In order to facilitate the realization of the water injection function of the first piston tube 62, the inner diameter of the first cavity is the same as the inner diameter of the second cavity. A third cavity smaller than the inner diameter of the first cavity is provided between the first cavity and the second cavity. The inner diameter of the third cavity is adapted to the outer diameter of the first piston tube 62. A ring plug is fixedly provided at the top of the first cavity. The position of the ring plug is higher than the position of the first channel 611. The ring plug is located between the first cavity and the first piston tube 62 and is slidably connected to the first piston tube 62.

[0037] Specifically, in order to facilitate the installation of the capsule, the first capsule 63 is sleeved on the outer periphery of the first cylinder 61, and the top end and the bottom end of the first capsule 63 are respectively fixedly connected to the first cylinder 61; the second capsule 73 is sleeved on the outer periphery of the second cylinder 71, and the top end and the bottom end of the second capsule 73 are respectively fixedly connected to the second cylinder 71.

[0038] Specifically, in order to facilitate the detection of the real-time pressure of the water pressure test section, a piezometer for measuring the pressure of the water pressure test section is provided on the outer side wall of the test section pipe 8.

[0039] Preferably, for the convenience of processing, the structure of the second cylinder block 71 is the same as that of the first cylinder block 61.

[0040] In specific implementation, the implementation of the device of the present invention includes the following steps:

[0041] 1. Drill holes, form holes and clean holes at the designed positions by a drilling rig; connect the support pipe 5, the upper water stop plug 6, the test section pipe 8, and the lower water stop plug 7 in sequence, and the connection method can adopt threaded connection;

[0042] 2. Place the support pipe 5 into the drilled hole, place the upper water stop plug 6, the test section pipe 8, and the lower water stop plug 7 at the test position, and leave an appropriate gap with the bottom of the hole;

[0043] 3. Under the suspension action of the suspension rope 12, the first annular boss 622 of the first piston pipe 62 abuts against the second annular boss 613 of the first cylinder block 61, and the first piston pipe 62 and the first capsule 63 are connected through the first channel 611 and the second channel; in this state, the cavity in the support pipe 5 communicates with the first capsule 63, and the first capsule 63 and the second capsule 73 are connected through the connecting pipe 9; inject water and apply pressure to the two capsules through the water pressure device 1 until both the first capsule 63 and the second capsule 73 are tightly attached to the hole wall; stop applying pressure after the capsules are tightly attached to the hole wall and the pressure gauge shows that the predetermined pressure value is reached, and record the static water level in the hole;

[0044] 4. Apply pressure to the support pipe 5 through the driving device so that the third annular boss 621 of the upper water stop plug 6 abuts against the top end of the first cylinder block 61. At this time, the cavity in the support pipe 5 communicates with the test section pipe 8; apply pressure to the test section through the water pressure equipment, and record the pressure and flow rate, and calculate the rock mass permeability parameter of this test section;

[0045] 5. After the test is completed, reduce the water pressure of the test section, lift the support pipe 5, the first annular boss 622 abuts against the second annular boss 613, the cavity in the support pipe 5 communicates with the upper and lower two capsules, reduce the water pressure in the capsules, the first capsule 63 and the second capsule 73 shrink, and the capsules are separated from the hole wall; after the capsules are separated from the hole wall, after the support pipe 5 is withdrawn through the driving device, continue drilling;

[0046] 6. After drilling to the depth of the next test section, repeat steps 1 to 5 to obtain the permeability coefficient of the rock mass in the next test section.

[0047] The structure of the present invention is simple and the operation is convenient. The upper and lower water stop plugs can well adapt to the borehole walls under different formation conditions, forming a closed and isolated test hole section, which can obtain accurate rock formation permeability systems, and is applicable to shallow-hole conventional water pressure tests and deep-hole high-pressure water pressure tests, especially for the permeability parameter tests of the formations along high dams, high-head surge shafts, bifurcated pipes and high-pressure water conveyance pipelines. The present invention has the advantages of simple and easy-to-operate single-pipe top-pressure plugging equipment, and also has the advantages of the water pressure plugging being able to adapt to complex hole wall conditions and having good water stop and sealing effects.

[0048] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Single-pipe water-pressure double water-stop plug, characterized in that: It includes an upper water stop plug (6), a test section pipe (8), and a lower water stop plug (7) arranged in sequence from top to bottom. The test section pipe (8) is fixedly connected to the upper water stop plug (6) and the lower water stop plug (7) respectively, and a plurality of water inlet holes are provided on the outer periphery of the test section pipe (8); the upper water stop plug (6) includes a first cylinder body (61), a first piston pipe (62), and a first capsule (63). The bottom end of the first piston pipe (62) is closed. The first piston pipe (62) is placed inside the inner cavity of the first cylinder body (61) and is slidably connected thereto. The first capsule (63) is fixedly arranged on the outer periphery of the first cylinder body (61). A first channel (611) connecting to the inlet of the first capsule (63) is provided on the side wall of the first cylinder body (61), and a second channel is provided at the bottom of the first piston pipe (62); the inner cavity of the first cylinder body (61) includes a first cavity and a second cavity. The first cavity is located above the second cavity. The inner diameter of the second cavity is larger than the outer diameter of the first piston pipe (62). The first channel (611) is provided at the position of the first cavity corresponding to the side wall of the first cylinder body (61). When the second channel of the first piston pipe (62) is placed in the first cavity, the first piston pipe (62) and the first cavity form a sealed structure, and the first piston pipe (62) and the first capsule (63) are connected through the first channel (611) and the second channel; The lower water stop plug (7) includes a second cylinder body (71) and a second capsule (73). One end of the test section pipe (8) is connected to the bottom end outlet of the first cylinder body (61). The second cavity is connected to the test section pipe (8) through the bottom end outlet of the first cylinder body (61). The other end of the test section pipe (8) is connected to the top inlet of the second cylinder body (71). The bottom of the second cylinder body (71) is a sealed structure; when the second channel of the first piston pipe (62) is placed in the second cavity, the first piston pipe (62) is connected to the test section pipe (8); a first connection channel (612) connecting to the first channel (611) is arranged along the axial direction on the side wall of the first cylinder body (61), a second connection channel (712) is arranged along the axial direction on the side wall of the second cylinder body (71), and a connecting pipe (9) connecting the two is arranged between the first connection channel (612) and the second connection channel (712); the second capsule (73) is fixedly arranged on the outer periphery of the second cylinder body (71), and a third channel (711) connecting the two is arranged between the second connection channel (712) and the inlet of the second capsule (73); A first annular boss (622) is provided at the bottom end of the first piston pipe (62). An inwardly protruding second annular boss (613) is provided on the inner side wall between the first cavity and the second cavity. The inner diameter of the second annular boss (613) is adapted to the outer diameter of the first piston pipe (62). The outer diameter of the first annular boss (622) is adapted to the inner diameter of the first cylinder body (61), and the first annular boss (622) is placed below the second annular boss (613). When the first annular boss (622) abuts against the second annular boss (613), the second channel corresponds to the first channel (611); A third annular boss (621) protruding outward is provided on the outer periphery of the first piston tube (62). The third annular boss (621) is placed above the top end of the first cylinder block (61). When the third annular boss (621) abuts against the top end of the first cylinder block (61), the second channel of the first piston tube (62) is located in the second cavity.

2. The single-pipe water-pressure double-water-stop plug as claimed in claim 1, wherein: The outer diameter of the first piston tube (62) is smaller than the inner diameter of the first cavity. A fixed ring sleeve (10) is fixedly provided on the outer peripheral surface of the first piston tube (62). The first piston tube (62) is slidably connected to the first cylinder block (61) through the fixed ring sleeve (10).

3. The single-pipe water-pressure double-sealing plug as described in claim 1, characterized in that: The inner diameter of the first cavity is the same as the inner diameter of the second cavity. A third cavity smaller than the inner diameter of the first cavity is provided between the first cavity and the second cavity. The inner diameter of the third cavity is adapted to the outer diameter of the first piston tube (62). An annular plug is fixedly provided at the top of the first cavity. The position of the annular plug is higher than the position of the first channel (611). The annular plug is located between the first cavity and the first piston tube (62) and is slidably connected to the first piston tube (62).

4. The single-pipe hydraulic double-sealing plug as described in claim 1, wherein: The first capsule (63) is sleeved on the outer periphery of the first cylinder block (61). The top end and the bottom end of the first capsule (63) are respectively fixedly connected to the first cylinder block (61); the second capsule (73) is sleeved on the outer periphery of the second cylinder block (71). The top end and the bottom end of the second capsule (73) are respectively fixedly connected to the second cylinder block (71).

5. The single-pipe water-pressure double-sealing plug as claimed in claim 1, wherein: A piezometer for measuring the pressure of the water pressure test section is provided on the outer side wall of the test section pipe (8).

6. Pressurized water test device, comprising a pressurized water device (1), a water delivery pipe (4), a support pipe (5) and a support device, characterized in that: It further includes the single-pipe water pressure double-sealing plug as described in any one of claims 1 to 5. The support pipe (5) is arranged vertically. A support device is used to hoist the support pipe (5). The water outlet of the water pressure device (1) is connected to the water inlet of the support pipe (5) through a water delivery pipe (4). A flow meter (2) and a pressure gauge (3) are provided on the water delivery pipe (4). The bottom end of the support pipe (5) is fixedly connected to the top end of the first piston tube (62).

7. The water pressure test device according to claim 6, wherein: The support device includes a support frame (11), a suspension rope (12), and a driving device for driving the suspension rope (12) to lift and lower. The driving device is fixedly provided on the support frame (11). One end of the suspension rope (12) is fixedly connected to the top of the support pipe (5), and the other end of the suspension rope (12) is fixedly connected to the output end of the driving device.

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