CN217819893U - Single-tube hydraulic double-water-stop plug and water-pressing test testing device - Google Patents

Abstract

The utility model relates to a geological engineering surveys equipment technical field, discloses a two stagnant water embolism of single tube hydraulic pressure formula and water-pressing test testing arrangement. The utility model discloses both ends set up upper water stopping embolism and lower water stopping embolism respectively about the pressurized-water test section, communicate first capsule and second capsule through the connecting pipe for the water injection of two capsules goes on in step, laminate to the pore wall simultaneously, can form the test section that keeps apart the effect better, make the rock mass osmotic coefficient that surveys more accurate; through the removal of control stay tube, realize stay tube inner chamber and capsule intercommunication, stay tube inner chamber and experimental section pipe intercommunication to two kinds of states realize the location through first annular boss, second annular boss and third annular boss and switch, realize the positioning control to first piston tube, are convenient for realize water injection respectively to capsule, experimental section pipe, reduce the operation degree of difficulty and easy operation.

Description

Single-tube hydraulic double-water-stop plug and water-pressing test testing device

Technical Field

The utility model relates to a geological engineering surveys equipment technical field, especially relates to a two stagnant water embolism of single tube hydraulic pressure formula and water-pressing test testing arrangement.

Background

The water pressure test is an important work content of hydroelectric engineering survey design, is a technical means for most intuitively obtaining the permeability coefficient of a rock mass, and provides the most basic data for evaluating the permeability characteristic of the rock mass and designing permeability control measures. The general test pressure is less than 1.0MPa for a conventional water pressing test, the test pressure is more than 1.0MPa for a high-pressure water pressing test, wherein the water-stopping plug is a key device of the water pressing test, and particularly, the water-stopping effect of the water-stopping plug in the high-pressure water pressing test has great influence on the test water pressing test result.

At present, the domestic water stop plugs are of double-pipe circulation type, single-pipe top pressure type, hydraulic type, oil pressure type, air pressure type and the like. The single-tube top-pressing type rubber plug is the most widely applied equipment in the current hydropower and water conservancy industries, has the advantages of simple structure and easy operation, but has the defects of unsatisfactory sealing, particularly, in the condition that the drilling hole wall of a soft rock stratum or a broken stratum is incomplete, accidents in the hole easily occur, the rubber plug is excessively deformed to cause the blocking in the hole, and the water stop plug is easily blocked. The capsule of water pressure formula embolism easily hugs closely with the pore wall, even under the not too straight condition of pore wall, also can realize the face contact, and the stagnant water reliability is better, all can adapt to the drilling of different apertures, bore depth, and the operation is more convenient, but the equipment commonly used at present adopts single embolism to keep apart the test section, and the isolation is not good.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem provide a two stagnant water embolism of single tube water pressure formula and pressurized-water test testing arrangement who improves test effect.

The utility model provides a technical scheme that its technical problem adopted is: the single-pipe hydraulic double-water-stop plug comprises an upper water-stop plug, a test section pipe and a lower water-stop plug which are sequentially arranged from top to bottom, wherein the test section pipe is fixedly connected with the upper water-stop plug and the lower water-stop plug respectively, and a plurality of water inlet holes are formed in the periphery of the test section pipe; the upper water stop plug comprises 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 arranged in the inner cavity of the first cylinder body and is in sliding connection with the first piston pipe, the first capsule is fixedly arranged on the periphery of the first cylinder body, a first channel connected with a first capsule inlet is formed in the side wall of the first cylinder body, and a second channel is formed in the bottom of the first piston pipe; the first cylinder inner cavity comprises a first cavity and a second cavity, the first cavity is positioned above the second cavity, the inner diameter of the second cavity is larger than the outer diameter of the first piston tube, the first channel is arranged at the position, corresponding to the side wall of the first cylinder, of the first cavity, when the second channel of the first piston tube is arranged in the first cavity, the first piston tube and the first cavity form a closed structure, and the first piston tube is communicated with the first capsule through the first channel and the second channel; the lower water stop plug comprises a second cylinder body and a second capsule, one end of the test section pipe is connected with 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 with the top inlet of the second cylinder body, the bottom of the second cylinder body is of a closed structure, and when the second channel of the first piston pipe is arranged in the second cavity, the first piston pipe is communicated with the test section pipe; the side wall of the first cylinder body is provided with a first connecting channel connected with the first channel along the axial direction, the side wall of the second cylinder body is provided with a second connecting channel along the axial direction, and a connecting pipe for connecting the first connecting channel and the second connecting channel is arranged between the first connecting channel and the second connecting channel; the second capsule is fixedly arranged on the periphery of the second cylinder body, and a third channel for connecting the second connecting channel with the second capsule inlet is arranged between the second connecting channel and the second capsule inlet.

Further, the method comprises the following steps: first piston tube bottom is provided with first annular boss, and the inside wall between first cavity and the second cavity is provided with inside convex second annular boss, the internal diameter and the first piston tube external diameter looks adaptation of second annular boss, first annular boss external diameter and first cylinder internal diameter looks adaptation, and second annular boss below is arranged in to first annular boss, and when first annular boss and second annular boss butt, the second passageway is corresponding with first passageway.

Further, the method comprises the following steps: 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 connected with the first cylinder body in a sliding mode through the fixed ring sleeve.

Further, the method comprises the following steps: the periphery of the first piston pipe is provided with a third annular boss protruding outwards, the third annular boss is arranged above the top end of the first cylinder body, and when the third annular boss is abutted against the top end of the first cylinder body, the second channel of the first piston pipe is located in the second cavity.

Further, the method comprises the following steps: 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 arranged between the first cavity and the second cavity, the inner diameter of the third cavity is matched with the outer diameter of the first piston tube, an annular plug is fixedly arranged at the top of the first cavity, the position of the annular plug is higher than that of the first channel, and the annular plug is located between the first cavity and the first piston tube and is in sliding connection with the first piston tube.

Further, the method comprises the following steps: the first capsule is sleeved on the periphery of the first cylinder body, and the top end and the bottom end of the first capsule are fixedly connected with the first cylinder body respectively; the second capsule is sleeved on the periphery of the first cylinder body, and the top end and the bottom end of the second capsule are fixedly connected with the second cylinder body respectively.

Further, the method comprises the following steps: the outer side wall of the test section pipe is provided with an osmometer for measuring the pressure of the pressurized water test section.

The utility model discloses a solve its technical problem and still provide a water-pressure test testing arrangement, including water pressing device, raceway, stay tube and strutting arrangement, still include the two stagnant water embolism of single tube water pressure formula, the vertical setting of stay tube, strutting arrangement are used for hoist and mount the stay tube, and water pressing device delivery port passes through water piping connection with the stay tube water inlet, are provided with flowmeter and pressure gauge on the raceway, stay tube bottom and first piston tube top end fixed connection.

Further, the method comprises the following steps: the supporting device comprises a supporting frame, a lifting rope and a driving device for driving the lifting rope to ascend and descend, the driving device is fixedly arranged on the supporting frame, one end of the lifting rope is fixedly connected with the top of the supporting tube, and the other end of the lifting rope is fixedly connected with the output end of the driving device.

The utility model has the advantages that:

1. an upper water stop plug and a lower water stop plug are respectively arranged at the upper end and the lower end of the test section pipe, the first capsule is communicated with the second capsule through a connecting pipe, so that water injection of the two capsules is synchronously performed, meanwhile, the hole walls are jointed, a test section with a better isolation effect can be formed, and the measured permeability coefficient of the rock mass is more accurate;

2. through the removal of control stay tube, realize stay tube inner chamber and capsule intercommunication, stay tube inner chamber and experimental section pipe intercommunication to two kinds of states realize the location through first annular boss, second annular boss and third annular boss and switch, realize the positioning control to first piston tube, are convenient for realize water injection respectively to capsule, experimental section pipe, reduce the operation degree of difficulty and easy operation.

3. The middle pressure water test device measures the permeability coefficient of the rock mass through the single-tube hydraulic double-water-stop plug, the isolation effect is better, and the measured permeability coefficient of the rock mass is more accurate; and the device is simple to operate and convenient to implement.

Drawings

FIG. 1 is a schematic view of a single tube hydraulic double-stoped water embolic device;

FIG. 2 is a sectional view of the internal structure of the upper water stop plug and the lower water stop plug;

FIG. 3 is a sectional view of the internal structure of the upper water stop plug and the lower water stop plug;

FIG. 4 is a schematic view of the first cylinder;

FIG. 5 is a schematic diagram of a first cylinder.

Labeled as: 1, a water pressing device; 2, a flow meter; 3, a pressure gauge; 4, conveying a water pipe; 5 supporting the tube; 6, water stopping and plugging; 7. a lower water stop plug; 8, testing a section pipe; 9 connecting pipes; 10 fixing the loop; 11 a support frame; 12, lifting a rope; 61 a first cylinder; 611. a first channel; 612 a first connecting channel; 613 a second annular boss; 62 a first piston tube; 621 a third annular boss; 622. a first annular boss; 63 a first capsule; 71 a second cylinder; 711 third channel; 712 second connecting channel; 72 a second piston tube; 73 second capsule.

Detailed Description

In the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and such terms are only used for convenience of description and simplification of the description, and do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance. In this context, "parallel," "perpendicular," and the like are not strictly mathematical and/or geometric limitations, but also encompass tolerances as would be understood by one skilled in the art and permitted by fabrication or use.

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

As shown in fig. 1, the testing device for water pressure test of the present invention comprises a water pressure device 1, a water pipe 4, a supporting device, a supporting tube 5 and a single-tube hydraulic double-water-stop plug, wherein the supporting tube 5 is vertically arranged, the supporting device comprises a supporting frame 11, a lifting rope 12 and a driving device for driving the lifting rope 12 to go up and down, the driving device is fixedly arranged on the supporting frame 11, one end of the lifting rope 12 is fixedly connected with the supporting tube 5, so as to lift the supporting tube, and the other end of the lifting rope 12 is fixedly connected with the output end of the driving device; the water pumping device 1 applies pressure to water, the water is pumped into the supporting tube 5, a water outlet of the water pumping device 1 is connected with a water inlet of the supporting tube 5 through a water conveying tube 4, and a parameter flowmeter 2 and a pressure gauge 3 for testing the water flow in the pipeline are arranged on the water conveying tube 4.

The single-pipe hydraulic double-water-stop plug comprises an upper water-stop plug 6, a test section pipe 8 and a lower water-stop plug 7 which are sequentially arranged from top to bottom, wherein the test section pipe 8 is fixedly connected with the upper water-stop plug 6 and the lower water-stop plug 7 respectively, and a plurality of water inlet holes are formed in the periphery of the test section pipe 8; as shown in fig. 2 and 3, the upper water stop plug 6 includes a first cylinder 61, a first piston tube 62 and a first capsule 63, the bottom end of the first piston tube 62 is closed, the top end of the first piston tube 62 is fixedly connected with the bottom end of the support tube 5, the first piston tube 62 is disposed in the inner cavity of the first cylinder 61 and is in sliding fit with the first piston tube, the first capsule 63 is fixedly disposed on the periphery of the first cylinder 61, the side wall of the first cylinder 61 is provided with a first channel 611 connected with the inlet of the first capsule 63, and the bottom of the first piston tube 62 is provided with a second channel; the inner cavity of the first cylinder 61 comprises 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 tube 62, and the first channel 611 is arranged at the position, corresponding to the side wall of the first cylinder 61, of the first cavity; as shown in fig. 2, when the second channel of the first piston tube 62 is disposed in the first cavity, the first piston tube 62 and the first cavity form a sealed structure, and the first piston tube 62 and the first capsule 63 are communicated through the first channel 611 and the second channel;

the lower water stop plug 7 comprises a second cylinder body 71 and a second capsule 73, one end of the test section pipe 8 is connected with the bottom end outlet of the first cylinder body 61, the second cavity is communicated with 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 with the top end inlet of the second cylinder body 71, and the bottom of the second cylinder body 71 is of a closed structure; as shown in fig. 3, when the second passage of the first piston tube 62 is placed in the second chamber, the first piston tube 62 communicates with the test segment tube 8;

a first connecting channel 612 connected with the first channel 611 is arranged on the side wall of the first cylinder body 61 along the axial direction of the first cylinder body, a second connecting channel 712 is arranged on the side wall of the second cylinder body 71 along the axial direction of the second cylinder body, and a connecting pipe 9 for connecting the first connecting channel 612 and the second connecting channel 712 is arranged between the first connecting channel 612 and the second connecting channel 712; the second capsule 73 is fixedly arranged on the periphery of the second cylinder 71, and a third channel 711 for connecting the second connecting channel 712 and the inlet of the second capsule 73 is arranged between the two.

In the utility model, the first piston tube 62 has two position states, the first state is that the second channel is communicated 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 61 and the outer side wall of the first piston tube 62, the sealed area only has a channel for water flow to be injected into the first capsule 63 from the first piston tube 62, and the water flow can not flow out from other structural components; the second state is that the second channel is in the second cavity and is communicated with the test section pipe 8, and because the bottom of the second cylinder 71 is of a closed structure, water flow can only flow out of the water inlet hole of the test section pipe 8. Therefore, the first cylinder 61 can be the structure shown in fig. 2, fig. 4 or fig. 5, and certainly not only the structure mentioned in the present invention, but also the structure that can achieve the above-mentioned function is suitable for the present invention.

The working principle is as follows:

the supporting pipe 5 is arranged in a drill hole, the water pressing device 1 injects water into the supporting pipe 5, water flow enters the first piston pipe 62 through the supporting pipe 5, a second channel of the first piston pipe 62 is hung downwards to a position corresponding to a first channel 611 of the first cylinder body 61, the first piston pipe 62 is communicated with the first capsule 63 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, the first capsule 63 and the second capsule 73 both expand laterally until the first capsule 63 and the second capsule 73 are tightly attached to the wall of the drill hole, after the first capsule 63 and the second capsule 73 are expanded, the first cylinder body 61 and the second cylinder body 2 are fixed at the position, and a water pressing test section is in a closed state under the common upper and lower sealing action of the first capsule 63 and the second capsule 73; then continue to hang down first piston tube 62 in the second cavity of first cylinder body 61, first piston tube 62 and test section pipe 8 pass through the second passageway intercommunication, rivers enter into test section pipe 8 from first piston tube 62, then pass through the inlet opening and pour into the space between rock stratum and test section pipe 8 into, when rivers pressure and rivers flow reach corresponding state, test pressure and flow at this moment are recorded, and then obtain the infiltration parameter of this section rock mass.

Specifically, in order to enable the second channel to be communicated and matched with the first channel 611, and to facilitate positioning of the movement of the first piston tube 62, the bottom end of the first piston tube 62 is provided with a first annular boss 622, the inner side wall between the first cavity and the second cavity is provided with a second annular boss 613 protruding inwards, the inner diameter of the second annular boss 613 is matched with the outer diameter of the first piston tube 62, the outer diameter of the first annular boss 622 is matched with the inner diameter of the first cylinder 61, the first annular boss 622 is arranged 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 is communicated with the first capsule 63.

Specifically, in order to realize 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, the outer peripheral surface of the first piston tube 62 is fixedly provided with a fixed ring sleeve 10, the fixed ring sleeve 10 is arranged above the second channel, and the first piston tube 62 is connected with the first cylinder 61 in a sliding manner through the fixed ring sleeve 10; it should be understood that the fixing collar 10 is made of a waterproof material, has good wear resistance, and can be adapted to the corresponding working environment.

Specifically, in order to realize that the second channel enters the second cavity at a specific position, the outer periphery of the first piston tube 62 is provided with a third annular boss 621 protruding outwards, the third annular boss 621 is arranged above the top end of the first cylinder body 61, and when the third annular boss 621 abuts against the top end of the first cylinder body 61, the second channel of the first piston tube 62 is located in the second cavity.

The utility model discloses a further another embodiment, as shown in fig. 5, in order to facilitate the realization of realizing first piston pipe 62 water injection function, first cavity internal diameter is the same with the second cavity internal diameter, be provided with the third cavity that is less than first cavity internal diameter between first cavity and the second cavity, third cavity internal diameter and first piston pipe 62 external diameter looks adaptation, the fixed annular stopper that is equipped with in top of first cavity, annular stopper position is higher than first passageway 611 position, the annular stopper is located between first cavity and the first piston pipe 62 to with first piston pipe 62 sliding connection.

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

Specifically, in order to facilitate the detection of the real-time pressure of the pressurized water test section, the outer side wall of the test section pipe 8 is provided with an osmometer for measuring the pressure of the pressurized water test section.

Preferably, the second cylinder 71 has the same structure as the first cylinder 61 for easy processing.

In particular, the device of the present invention comprises the following steps:

1. drilling, forming and cleaning holes at the designed position by a drilling machine; the support tube 5, the upper stop water plug 6, the test section tube 8 and the lower stop water plug 7 are connected in sequence in a threaded manner;

2. putting a supporting tube 5 into a drill hole, putting an upper water stop plug 6, a test section tube 8 and a lower water stop plug 7 on a test part, and leaving a proper pore with the bottom of the hole;

3. under the suspension action of the suspension rope 12, the first annular boss 622 of the first piston tube 62 abuts against the second annular boss 613 of the first cylinder 61, and the first piston tube 62 and the first capsule 63 communicate through the first passage 611 and the second passage; in this state, the cavity in the support tube 5 is communicated with the first capsule 63, and the first capsule 63 is communicated with the second capsule 73 through the connecting tube 9; injecting water into the two capsules by using the water pressurizing device 1 and applying pressure until the first capsule 63 and the second capsule 73 are tightly attached to the hole walls; the capsule clings to the hole wall, the pressure gauge stops applying pressure after the pressure gauge displays that a preset pressure value is reached, and the static water level in the hole is recorded;

4. the driving device applies pressure to the supporting tube 5 to enable the third annular boss 621 of the upper stop water plug 6 to be abutted against the top end of the first cylinder body 61, and at the moment, a cavity in the supporting tube 5 is communicated with the test section tube 8; pressurizing the test section through a water pressurizing device, recording the pressure and the flow, and calculating rock mass permeability parameters of the test section;

5. after the test is finished, the water pressure of the test section is reduced, the supporting tube 5 is lifted, the first annular boss 622 is abutted to the second annular boss 613, a cavity in the supporting tube 5 is communicated with the upper capsule and the lower capsule, the water pressure in the capsules is reduced, the first capsule 63 and the second capsule 73 shrink, and the capsules are separated from the hole wall; after the capsule is separated from the hole wall, the supporting tube 5 is lifted out by a driving device, and drilling is continued;

6. and repeating the steps of 1 to 5 after drilling to the depth of the next test section, and obtaining the permeability coefficient of the rock mass of the next test section.

The utility model has simple structure and convenient operation, wherein the upper and lower water stop plugs can be well adapted to the drilling hole walls under different stratum conditions to form a closed and isolated test hole section, which can obtain an accurate stratum penetration system and is suitable for shallow hole conventional water pressure test and deep hole high pressure water pressure test, in particular to the penetration parameter test of the stratum along the high dam, high water head surge shaft, branch pipe and high pressure water delivery pipeline; the utility model discloses possess the advantage that single tube roof pressure formula embolism equipment is simple, easy to operate, also have hydraulic pressure formula embolism and adapt to complicated pore wall condition, stagnant water and seal effectual advantage.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. Single tube hydraulic pressure formula two stagnant water embolism, its characterized in that: the water-stopping device comprises an upper water-stopping plug (6), a test section pipe (8) and a lower water-stopping plug (7) which are sequentially arranged from top to bottom, wherein the test section pipe (8) is fixedly connected with the upper water-stopping plug (6) and the lower water-stopping plug (7) respectively, and a plurality of water inlet holes are formed in the periphery of the test section pipe (8); the upper water stop plug (6) comprises 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 arranged in the inner cavity of the first cylinder body (61) and is in sliding connection with the inner cavity, the first capsule (63) is fixedly arranged on the periphery of the first cylinder body (61), a first channel (611) connected with an inlet of the first capsule (63) is formed in the side wall of the first cylinder body (61), and a second channel is formed in the bottom of the first piston pipe (62); the inner cavity of the first cylinder body (61) comprises a first cavity and a second cavity, the first cavity is positioned 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, corresponding to the side wall of the first cylinder body (61), of the first cavity, when the second channel of the first piston pipe (62) is arranged in the first cavity, the first piston pipe (62) and the first cavity form a closed structure, and the first piston pipe (62) is communicated with the first capsule (63) through the first channel (611) and the second channel;

the lower water stop plug (7) comprises a second cylinder body (71) and a second capsule (73), one end of a test section pipe (8) is connected with an outlet at the bottom end of the first cylinder body (61), the second cavity is communicated with the test section pipe (8) through an outlet at the bottom end of the first cylinder body (61), the other end of the test section pipe (8) is connected with an inlet at the top end of the second cylinder body (71), and the bottom of the second cylinder body (71) is of a closed structure; when the second channel of the first piston pipe (62) is arranged in the second cavity, the first piston pipe (62) is communicated with the test section pipe (8); a first connecting channel (612) connected with the first channel (611) is arranged on the side wall of the first cylinder body (61) along the axial direction of the first cylinder body, a second connecting channel (712) is arranged on the side wall of the second cylinder body (71) along the axial direction of the second cylinder body, and a connecting pipe (9) for connecting the first connecting channel (612) and the second connecting channel (712) is arranged between the first connecting channel (612) and the second connecting channel (712); the second capsule (73) is fixedly arranged on the periphery of the second cylinder body (71), and a third channel (711) for connecting the second connecting channel (712) and the inlet of the second capsule (73) is arranged between the second connecting channel (712) and the inlet of the second capsule (73).

2. The single-pipe hydraulic double-water-stop plug as claimed in claim 1, wherein: the bottom end of the first piston pipe (62) is provided with a first annular boss (622), the inner side wall between the first cavity and the second cavity is provided with a second annular boss (613) protruding inwards, the inner diameter of the second annular boss (613) is matched with the outer diameter of the first piston pipe (62), the outer diameter of the first annular boss (622) is matched with the inner diameter of the first cylinder body (61), the first annular boss (622) is arranged below the second annular boss (613), and when the first annular boss (622) is abutted to the second annular boss (613), the second channel corresponds to the first channel (611).

3. The single-tube hydraulic double water stop plug as claimed in claim 2, wherein: the outer diameter of the first piston pipe (62) is smaller than the inner diameter of the first cavity, a fixing ring sleeve (10) is fixedly arranged on the outer peripheral surface of the first piston pipe (62), and the first piston pipe (62) is connected with the first cylinder body (61) in a sliding mode through the fixing ring sleeve (10).

4. The single-tube hydraulic double water stop plug as claimed in claim 1, wherein: the periphery of the first piston pipe (62) is provided with a third annular boss (621) protruding outwards, the third annular boss (621) is arranged above the top end of the first cylinder body (61), and when the third annular boss (621) is abutted to the top end of the first cylinder body (61), the second channel of the first piston pipe (62) is located in the second cavity.

5. The single-pipe hydraulic double-water-stop plug as claimed in claim 1, wherein: 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 arranged between the first cavity and the second cavity, the inner diameter of the third cavity is matched with the outer diameter of the first piston pipe (62), an annular plug is fixedly arranged at the top of the first cavity, the position of the annular plug is higher than that of the first channel (611), and the annular plug is located between the first cavity and the first piston pipe (62) and is in sliding connection with the first piston pipe (62).

6. The single-tube hydraulic double water stop plug as claimed in claim 1, wherein: the first capsule (63) is sleeved on the periphery of the first cylinder body (61), and the top end and the bottom end of the first capsule (63) are fixedly connected with the first cylinder body (61) respectively; the second capsule (73) is sleeved on the periphery of the first cylinder body (61), and the top end and the bottom end of the second capsule (73) are fixedly connected with the second cylinder body (71) respectively.

7. The single-tube hydraulic double water stop plug as claimed in claim 1, wherein: the outer side wall of the test section pipe (8) is provided with an osmometer for measuring the pressure of the pressurized water test section.

8. Test device of pressurized-water test, including pressurized-water device (1), raceway (4), stay tube (5) and strutting arrangement, its characterized in that: the single-tube hydraulic double-water-stop plug further comprises the single-tube hydraulic double-water-stop plug as claimed in any one of claims 1 to 7, wherein the supporting tube (5) is vertically arranged, the supporting device is used for hoisting the supporting tube (5), a water outlet of the water pressing device (1) is connected with a water inlet of the supporting tube (5) through a water conveying tube (4), a flowmeter (2) and a pressure gauge (3) are arranged on the water conveying tube (4), and the bottom end of the supporting tube (5) is fixedly connected with the top end of the first piston tube (62).

9. The water pressure test testing apparatus of claim 8, wherein: the supporting device comprises a supporting frame (11), a lifting rope (12) and a driving device for driving the lifting rope (12) to ascend and descend, the driving device is fixedly arranged on the supporting frame (11), one end of the lifting rope (12) is fixedly connected with the top of the supporting tube (5), and the other end of the lifting rope (12) is fixedly connected with the output end of the driving device.

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