Multi-task combined finished product internal pressure testing machine

Abstract

The present application relates to the field of a mechanical property testing device for a prestressed steel cylinder concrete pipe finished product, and in particular to a multi-task combined finished product internal pressure testing machine; it includes a base, a core and a pressure cover; the bottom of the core is detachably sealed and connected to the base, and the top of the core is detachably sealed and connected to the pressure cover; the base includes at least two layers of lower insert rings arranged at intervals around the outer ring of the core, and the pressure cover includes at least two layers of upper bearing rings arranged at intervals around the outer ring of the core. Due to the implementation of the above technical scheme, the present application installs a detachable core between the pressure cover and the base, and the multi-layer upper bearing rings on the pressure cover are sealed and connected to the socket steel rings of PCCP of different specifications and models, and the multi-layer lower insert rings on the base are sealed and connected to the socket steel rings of PCCP of different specifications and models; through the combination of the base, the pressure cover and the core, the internal pressure crack resistance performance test of PCCP finished products of different specifications and models can be realized without replacing the base and the pressure cover.

Description

Technical Field

[0001] The present application relates to the field of a prestressed steel cylinder concrete pipe finished product mechanical property testing device, and in particular to a multi-task combined finished product internal pressure testing machine. Background Art

[0002] PCCP is a prestressed steel cylinder concrete pipe. In the current domestic PCCP production field, the internal pressure crack resistance of the finished pipe is usually based on the specifications of the pipe. A special matching base, core and top gland are made. Each nominal diameter of the pipe corresponds to a type of water pressure testing machine. After the PCCP is produced, it is hoisted to the finished product water pressure test area by a crane, and assembled with a special base, core and gland for water pressure testing. If other nominal diameter PCCP pipes are replaced for water pressure testing, all the internal water pressure equipment must be removed from the test area, and a new set of special base, core and gland must be replaced before the test can be carried out. This type of water pressure testing machine has high cost, cumbersome operation, labor-intensive and time-consuming, low work efficiency, difficult to control installation quality, high labor investment and high installation costs. Summary of the invention

[0003] The purpose of this application is to propose a multi-task combined finished product internal pressure testing machine with multiple combinations to avoid cumbersome processes.

[0004] The present application is implemented as follows: a multi-task combined finished product internal pressure testing machine, which includes a base, a core and a pressure cover; the bottom of the core is detachably sealed and connected to the base, and the top of the core is detachably sealed and connected to the pressure cover; the base includes at least two layers of lower insert rings arranged at intervals around the outer ring of the core, and the pressure cover includes at least two layers of upper supporting rings arranged at intervals around the outer ring of the core; the number of layers of the lower insert rings and the upper supporting rings correspond to each other, and the lower insert rings and upper supporting rings of the same layer can be respectively sealed and connected to the socket steel ring and plug steel ring of the same model of prestressed steel cylinder concrete pipe.

[0005] Furthermore, the gallbladder core includes an inner tube, an upper connecting ring fixed to the upper port of the inner tube, and a lower connecting ring fixed to the lower port of the inner tube; a plurality of first lower through holes are distributed along the circumferential direction on the upper connecting ring, and the upper connecting ring is fixedly connected to the pressure cover by a bolt assembly penetrating into the first lower through holes, and a first ring groove is provided on the upper end surface of the upper connecting ring and a first sealing ring is installed at a position corresponding to the outer circle of the first lower through hole; a plurality of second upper through holes are distributed along the circumferential direction on the lower connecting ring, and the lower connecting ring is fixedly connected to the base by a bolt assembly penetrating into the second upper through holes.

[0006] Furthermore, the pressure cover includes a pressure plate, an upper supporting ring, a support frame and a lifting ear; the center of the lower end surface of the pressure plate is sealed and connected to the top of the gall core, at least two layers of upper supporting rings are fixed on the lower end surface of the pressure plate of the outer ring of the gall core, and the inner end surface of the upper supporting ring is provided with a receiving section open to the outside at the bottom and a vertical sealing section at the top; an exhaust port is provided on the pressure plate corresponding to the position between the innermost upper supporting ring and the outer wall of the gall core; the support frame is fixed on the upper end surface of the pressure cover, and the lifting ear is fixed on the top of the support frame.

[0007] Furthermore, a first upper through hole corresponding to the first lower through hole is provided on the pressure plate, and the pressure plate and the upper connecting ring are fixedly connected by a bolt assembly passing through the first upper through hole and the first lower through hole; the lower end surface of the pressure plate and the upper end surface of the upper connecting ring are sealed by a first sealing ring.

[0008] Furthermore, the base includes a lower insert ring, a bottom plate and a support fixed below the bottom plate; the center of the upper end surface of the bottom plate is sealed to the bottom of the gallbladder core, the bottom of the lower insert ring is fixed to the upper end surface of the base of the outer ring of the gallbladder core, and the outer end surface of the lower insert ring is provided with at least one layer of a third sealing ring; a water inlet is provided on the lower end surface of the bottom plate corresponding to the position between the innermost lower insert ring and the outer wall of the gallbladder core.

[0009] Furthermore, a second lower through hole corresponding to the second upper through hole is provided on the bottom plate, and the lower connecting ring is fixedly connected to the bottom plate by a bolt assembly passing through the second upper through hole and the second lower through hole; corresponding to the position between the water inlet and the second lower through hole, a second annular groove is provided on the upper surface of the bottom plate and a second sealing ring is installed, and the lower end surface of the lower connecting ring and the upper end surface of the bottom plate are sealed by the second sealing ring.

[0010] Furthermore, the base includes a lower insert ring, a bottom plate and a support fixed under the bottom plate; a second lower through hole corresponding to the second upper through hole is provided on the bottom plate, and the lower connecting ring and the bottom plate are fixedly connected by a bolt assembly passing through the second upper through hole and the second lower through hole; corresponding to the position between the water inlet and the second lower through hole, a second ring groove is provided on the upper end surface of the bottom plate and a second sealing ring is installed, and the lower end surface of the lower connecting ring and the upper end surface of the bottom plate are sealed by the second sealing ring; the bottom plate is provided with a slideway, and the lower insert ring can be slidably installed in the slideway, and the outer end surface of the lower insert ring is provided with at least one layer of the third sealing ring; a plurality of groups of hydraulic cylinders that can push up the lower insert ring are provided in the support, and each group of hydraulic cylinders corresponds to a layer of the lower insert ring.

[0011] Furthermore, the lower insert ring includes a vertical sliding section, an upper pressure section fixed on the inner side of the top of the sliding section, and a lower pressure section fixed on both sides of the bottom of the sliding section; a third ring groove is provided on the upper part of the outer end surface of the sliding section and a third sealing ring is installed, a fourth ring groove is provided on the lower part of the inner end surface of the sliding section and a fourth sealing ring is installed, a fifth ring groove is provided on the lower end surface of the upper pressure section and a fifth sealing ring is installed, and sixth ring grooves are provided on both sides of the upper end surface of the lower pressure section and a sixth sealing ring is installed; when the corresponding hydraulic cylinder presses the lower pressure section tightly against the lower end surface of the bottom plate, the lower pressure section forms a seal with the bottom plate through the sixth sealing ring, the sliding section forms a seal with the slideway through the fourth sealing ring, and the sliding section forms a seal with the socket steel ring of the prestressed steel cylinder concrete pipe through the third sealing ring; when the corresponding hydraulic cylinder pressure is removed and the upper pressure section is pressed against the upper end surface of the bottom plate, the upper pressure section forms a seal with the bottom plate through the fifth sealing ring, and the sliding section forms a seal with the slideway through the third sealing ring.

[0012] The upper and lower ports of the slideway are both provided with bell mouths open outwards.

[0013] Each group of hydraulic cylinders is evenly distributed along the circumference of the corresponding lower insert ring, and the number of hydraulic cylinders in each group is at least two.

[0014] Due to the implementation of the above technical scheme, the present application installs a detachable core between the pressure cover and the base, and the multi-layer upper supporting ring on the pressure cover is sealed to the socket steel ring of PCCP of different specifications and models, and the multi-layer lower plug-in ring on the base is sealed to the socket steel ring of PCCP of different specifications and models; through the combination of the base, the pressure cover and the core, the internal pressure crack resistance performance test of PCCP finished products of different specifications and models is realized without replacing the base and the pressure cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specific structure of this application is given by the following drawings and embodiments:

[0016] Figure 1 This is the installation diagram of this application;

[0017] Figure 2 It is a schematic diagram of the structure of an embodiment of the present application;

[0018] Figure 3 yes Figure 2 Schematic diagram of the structure of the middle bladder core;

[0019] Figure 4 yes Figure 3 A partial enlarged schematic diagram of the structure at A in the middle;

[0020] Figure 5 yes Figure 2 Schematic diagram of the middle gland structure;

[0021] Figure 6 It is a structural diagram of a fixed base;

[0022] Figure 7 It is a schematic diagram of the structure of the movable base;

[0023] Figure 8 yes Figure 7 An enlarged schematic diagram of the middle and lower insert ring.

[0024] Legend: 1. Lower insert ring, 101. Sliding section, 102. Upper pressure section, 103. Lower pressure section, 104. Fourth sealing ring, 105. Fifth sealing ring, 106. Sixth sealing ring, 2. Upper bearing ring, 3. Prestressed steel cylinder concrete pipe, 4. Socket steel ring, 5. Socket steel ring, 6. Inner tube, 7. Upper connecting ring, 8. Lower connecting ring, 9. First lower through hole, 10. First sealing ring, 11. Second upper through hole, 12. Pressure plate, 13. Pressure gauge, 14. Support frame, 15. Lifting ear, 16. Receiving section, 17. Sealing section, 18. Exhaust port, 19. First upper through hole, 20. Support, 21. Bottom plate, 22. Third sealing ring, 23. Water inlet, 24. Second lower through hole, 25. Second sealing ring, 26. Hydraulic cylinder, 27. Working pit, 28. Water inlet pipe, 29. Booster pump. DETAILED DESCRIPTION

[0025] The present application is not limited by the following embodiments, and the specific implementation method can be determined according to the technical solution of the present application and actual conditions.

[0026] Examples, such as Figures 1 to 8 As shown, the multi-task combined finished internal pressure testing machine includes a base, a core and a pressure cover; the bottom of the core is detachably sealed and connected to the base, and the top of the core is detachably sealed and connected to the pressure cover; the base includes at least two layers of lower insert rings 1 arranged at intervals around the outer ring of the core, and the pressure cover includes at least two layers of upper supporting rings 2 arranged at intervals around the outer ring of the core; the number of layers of the lower insert ring 1 and the upper supporting ring 2 are matched, and the lower insert ring 1 and the upper supporting ring 2 of the same layer can be respectively sealed and connected to the socket steel ring 4 and the plug steel ring 5 of the prestressed steel cylinder concrete pipe 3 of the same model.

[0027] The present application is installed in the pressure test pit 27 for pressure test. The detachable core is installed between the gland and the base, the multi-layer upper bearing ring 2 on the gland is sealed and connected with the socket steel ring 5 of PCCP of different specifications and models, and the multi-layer lower insert ring 1 on the base is sealed and connected with the socket steel ring 4 of PCCP of different specifications and models; the material cost is greatly saved, the material is fully utilized, and the manufacturing and processing cost is saved at the same time.

[0028] Through the combination of the base, gland and core, the internal pressure crack resistance test of PCCP finished products of different specifications and models can be realized without replacing the base and gland, which greatly saves working hours and reduces labor intensity. It eliminates the irritating operation process of "selecting the base, inner core and gland that match the PCCP before testing" in the prior art.

[0029] In actual use, this application needs to make two sets, and the size of the PCCP corresponding to each set is selected from the standard size at intervals, and the sizes selected by the two sets are crossed. In this way, on the one hand, all types of PCCP can be subjected to water pressure tests, and on the other hand, it is convenient to process and manufacture the base and gland, and avoid the upper bearing ring 2 and the lower insert ring 1 being too dense, which affects the processing and use.

[0030] like Figures 1 to 3 As shown, the gallbladder core includes an inner tube 6, an upper connecting ring 7 fixed to the upper end of the inner tube 6, and a lower connecting ring 8 fixed to the lower end of the inner tube 6; a plurality of first lower through holes 9 are distributed along the circumferential direction on the upper connecting ring 7, and the upper connecting ring 7 is fixedly connected to the gland by a bolt assembly penetrating the first lower through holes 9, and a first annular groove is provided on the upper end surface of the upper connecting ring 7 and a first sealing ring 10 is installed at a position corresponding to the outer circle of the first lower through holes 9; a plurality of second upper through holes 11 are distributed along the circumferential direction on the lower connecting ring 8, and the lower connecting ring 8 is fixedly connected to the base by a bolt assembly penetrating the second upper through holes 11.

[0031] Fixed base, such as Figure 1 , 2 As shown in Figures 5 and 6, the pressure cover includes a pressure plate 12, an upper supporting ring 2, a support frame 14 and a lifting ear 15; the center of the lower end surface of the pressure plate 12 is sealed and connected to the top of the gallbladder core, at least two layers of upper supporting rings 2 are fixed on the lower end surface of the pressure plate 12 of the outer circle of the gallbladder core, and the inner end surface of the upper supporting ring 2 is provided with a receiving section 16 opened outward at the bottom and a vertical sealing section 17 at the top; an exhaust port 18 is provided on the pressure plate 12 corresponding to the position between the innermost upper supporting ring 2 and the outer wall of the gallbladder core; the support frame 14 is fixed on the upper end surface of the pressure cover, and the lifting ear 15 is fixed on the top of the support frame 14.

[0032] The exhaust port 18 is provided with an exhaust pipe, and an exhaust valve is provided on the exhaust.

[0033] like Figure 5 As shown, the pressure plate 12 is provided with a first upper through hole 19 corresponding to the first lower through hole 9, and the pressure plate 12 is fixedly connected to the upper connecting ring 7 by a bolt assembly passing through the first upper through hole 19 and the first lower through hole 9; the lower end surface of the pressure plate 12 and the upper end surface of the upper connecting ring 7 are sealed by a first sealing ring 10.

[0034] Fixed base, such as Figure 1 , 2As shown in Figure 6, the base includes a lower insert ring 1, a bottom plate 21 and a support 20 fixed below the bottom plate 21; the center of the upper end surface of the bottom plate 21 is sealed and connected to the bottom of the gallbladder core, the bottom of the lower insert ring 1 is fixed to the upper end surface of the base of the outer ring of the gallbladder core, and the outer end surface of the lower insert ring 1 is provided with at least one layer of a third sealing ring 22; corresponding to the position between the innermost lower insert ring 1 and the outer wall of the gallbladder core, a water inlet 23 is provided on the lower end surface of the bottom plate 21.

[0035] The water inlet pipe 28 is installed through the water inlet port 23, and a booster pump 29 is installed on the water inlet pipe 28, and a pressure gauge 13 is installed on the booster pump 29. The pressure gauge 13 used for the water pressure test must be identified by an organization with corresponding qualifications before use.

[0036] As an optimization for fixed bases, such as Figure 1 , 2 As shown in , 6, the bottom plate 21 is provided with a second lower through hole 24 corresponding to the second upper through hole 11, and the lower connecting ring 8 is fixedly connected to the bottom plate 21 by a bolt assembly passing through the second upper through hole 11 and the second lower through hole 24; corresponding to the position between the water inlet 23 and the second lower through hole 24, the upper end surface of the bottom plate 21 is provided with a second annular groove and a second sealing ring 25 is installed, and the lower end surface of the lower connecting ring 8 and the upper end surface of the bottom plate 21 are sealed by the second sealing ring 25.

[0037] Movable base, such as Figure 1 , 2 As shown in , 7 and 8, the base includes a lower insert ring 1, a bottom plate 21 and a support 20 fixed below the bottom plate 21; a second lower through hole 24 corresponding to the second upper through hole 11 is provided on the bottom plate 21, and the lower connecting ring 8 is fixedly connected to the bottom plate 21 by a bolt assembly passing through the second upper through hole 11 and the second lower through hole 24; corresponding to the position between the water inlet 23 and the second lower through hole 24, a second annular groove is provided on the upper end surface of the bottom plate 21 and a second sealing ring 25 is installed, and the lower end surface of the lower connecting ring 8 is sealed with the upper end surface of the bottom plate 21 by the second sealing ring 25; the bottom plate 21 is provided with a slideway, and the lower insert ring 1 can be slidably installed in the slideway, and the outer end surface of the lower insert ring 1 is provided with at least one layer of third sealing ring 22; a plurality of groups of hydraulic cylinders 26 that can push up the lower insert ring 1 are provided in the support 20, and each group of hydraulic cylinders 26 corresponds to a layer of lower insert ring 1.

[0038] As an optimization of the movable base, such as Figure 8As shown, the lower insert ring 1 includes a vertical sliding section 101, an upper pressing section 102 fixed on the inner side of the top of the sliding section 101, and a lower pressing section 103 fixed on both sides of the bottom of the sliding section 101; the upper part of the outer end surface of the sliding section 101 is provided with a third ring groove and a third sealing ring 22 is installed, the lower part of the inner end surface of the sliding section 101 is provided with a fourth ring groove and a fourth sealing ring 104 is installed, the lower end surface of the upper pressing section 102 is provided with a fifth ring groove and a fifth sealing ring 105 is installed, and both sides of the upper end surface of the lower pressing section 103 are provided with a sixth ring groove and a sixth sealing ring 106 is installed; corresponding to the hydraulic When the cylinder 26 presses the downward pressure section 103 tightly against the lower end surface of the bottom plate 21, the downward pressure section 103 forms a seal with the bottom plate 21 through the sixth sealing ring 106, the sliding section 101 forms a seal with the slideway through the fourth sealing ring 104, and the sliding section 101 forms a seal with the socket steel ring 4 of the prestressed steel cylinder concrete pipe 3 through the third sealing ring 22; when the pressure of the hydraulic cylinder 26 is removed and the upward pressure section 102 is pressed tightly against the upper end surface of the bottom plate 21, the upward pressure section 102 forms a seal with the bottom plate 21 through the fifth sealing ring 105, and the sliding section 101 forms a seal with the slideway through the third sealing ring 22.

[0039] As an optimization of the movable base, such as Figure 7 As shown, the upper and lower ports of the slideway are both provided with bell mouths that are open outside, so as to facilitate the up and down sliding of the lower insert ring 1 and facilitate the entry of the sealing ring.

[0040] As an optimization of the movable base, such as Figure 1 As shown, each group of hydraulic cylinders 26 is evenly distributed along the circumference of the corresponding lower insert ring 1, and the number of each group of hydraulic cylinders 26 is at least two. Each group of hydraulic cylinders 26 is driven synchronously to ensure that the lower insert ring 1 rises smoothly.

[0041] The use process of Example 2 of the present application is as follows: first, the present application is hoisted into the working pit 27. The bottom of the base can be leveled on all sides by adding a pad block; then the core is assembled with the base. The base and the core are water-stopped by a second sealing ring 25, and the connection method is a bolt assembly connection; by pushing the hydraulic cylinder 26 of the corresponding group, the corresponding lower plug ring 1 is lifted up, and then the gantry crane is used to hoist the finished prestressed steel cylinder concrete pipe 3 to the finished product water pressure test working pit 27 and assemble it with the base. The socket steel ring 4 of the prestressed steel cylinder concrete pipe 3 is connected with the corresponding lower plug ring 1 by socket, and the socket groove between them adopts a multi- After the third sealing ring 22 is used to stop water, and the prestressed steel cylinder concrete pipe 3 is assembled with the base, the gland is lifted by a gantry crane to the working pit 27 and assembled with the prestressed steel cylinder concrete pipe 3 and the core. The first sealing ring 10 is used to stop water between the pressure plate 12 and the core, and the connection method is bolt assembly connection; the socket steel ring 5 of the prestressed steel cylinder concrete pipe 3 is connected with the corresponding upper bearing ring 2 by a socket, and the pressure plate 12 and the socket steel ring 5 of the prestressed steel cylinder concrete pipe 3 are sealed by the sealing ring on the socket steel ring 5. Then, the water inlet pipe 28 is connected to the base and the booster pump 29, and the pressure gauge 13 is installed; the exhaust pipe is connected to the gland. After the pressure gauge 13 is installed, it can be filled with water for water pressure test, and the whole installation process is completed.

[0042] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0043] The above technical features constitute the embodiments of the present application, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A multi-task combined finished product internal pressure testing machine, characterized in that: It comprises a base, a core and a gland; the bottom of the core is detachably connected to the base in a seal, and the top of the core is detachably connected to the gland in a seal; the base comprises at least two layers of lower insert rings arranged at intervals around the outer ring of the core, and the gland comprises at least two layers of upper bearing rings arranged at intervals around the outer ring of the core; the number of layers of the lower insert rings and the upper bearing rings correspond to each other, and the lower insert rings and the upper bearing rings of the same layer can be respectively sealed and connected with the socket steel ring and the plug steel ring of the prestressed steel cylinder concrete pipe of the same model; the core comprises an inner cylinder, an upper connecting ring fixed to the upper port of the inner cylinder, and a lower connecting ring fixed to the lower port of the inner cylinder; a plurality of first lower through holes are distributed on the upper connecting ring along the circumferential direction, and the upper connecting ring is fixedly connected to the gland by a bolt assembly penetrated into the first lower through hole, and corresponding to the position of the outer ring of the first lower through hole, the upper end face of the upper connecting ring is provided with a first ring groove and is installed with a first A sealing ring; a plurality of second upper through holes are distributed along the circumference of the lower connecting ring, and the lower connecting ring is fixedly connected to the base by a bolt assembly penetrating the second upper through holes; the pressure cover comprises a pressing plate, an upper supporting ring, a support frame and a lifting ear; the center of the lower end surface of the pressing plate is sealed and connected to the top of the gallbladder core, at least two layers of upper supporting rings are fixed on the lower end surface of the pressing plate of the outer ring of the gallbladder core, and the inner end surface of the upper supporting ring is provided with a receiving section open to the outside at the bottom and a sealing section vertical at the top; an exhaust port is provided on the pressing plate corresponding to the position between the innermost upper supporting ring and the outer wall of the gallbladder core; the support frame is fixed on the upper end surface of the pressure cover, and the lifting ear is fixed on the top of the support frame; a first upper through hole corresponding to the first lower through hole is provided on the pressing plate, and the pressing plate and the upper connecting ring are fixedly connected by a bolt assembly penetrating the first upper through hole and the first lower through hole; the lower end surface of the pressing plate and the upper end surface of the upper connecting ring are sealed by a first sealing ring.

2. The multi-task combined finished product internal pressure testing machine according to claim 1 is characterized in that: The base includes a lower insert ring, a bottom plate and a support fixed below the bottom plate; the center of the upper end surface of the bottom plate is sealed with the bottom of the gallbladder core, the bottom of the lower insert ring is fixed on the upper end surface of the base of the outer ring of the gallbladder core, and the outer end surface of the lower insert ring is provided with at least one layer of a third sealing ring; a water inlet is provided on the lower end surface of the bottom plate corresponding to the position between the innermost lower insert ring and the outer wall of the gallbladder core.

3. The multi-task combined finished product internal pressure testing machine according to claim 2 is characterized in that: A second lower through hole corresponding to the second upper through hole is provided on the bottom plate, and the lower connecting ring is fixedly connected to the bottom plate by a bolt assembly passing through the second upper through hole and the second lower through hole; corresponding to the position between the water inlet and the second lower through hole, a second annular groove is provided on the upper surface of the bottom plate and a second sealing ring is installed, and the lower end surface of the lower connecting ring and the upper end surface of the bottom plate are sealed by the second sealing ring.

4. The multi-task combined finished product internal pressure testing machine according to claim 1 is characterized in that: The base includes a lower insert ring, a bottom plate and a support fixed under the bottom plate; a second lower through hole corresponding to the second upper through hole is provided on the bottom plate, and the lower connecting ring and the bottom plate are fixedly connected by a bolt assembly passing through the second upper through hole and the second lower through hole; corresponding to the position between the water inlet and the second lower through hole, a second ring groove is provided on the upper surface of the bottom plate and a second sealing ring is installed, and the lower end surface of the lower connecting ring and the upper end surface of the bottom plate are sealed by the second sealing ring; the bottom plate is provided with a slideway, and the lower insert ring can be slidably installed in the slideway, and the outer end surface of the lower insert ring is provided with at least one layer of the third sealing ring; a plurality of groups of hydraulic cylinders that can push up the lower insert ring are provided in the support, and each group of hydraulic cylinders corresponds to a layer of the lower insert ring.

5. The multi-task combined finished product internal pressure testing machine according to claim 4 is characterized in that: The lower insert ring includes a vertical sliding section, an upper pressure section fixed on the inner side of the top of the sliding section, and a lower pressure section fixed on both sides of the bottom of the sliding section; a third ring groove is provided on the upper part of the outer end surface of the sliding section and a third sealing ring is installed, a fourth ring groove is provided on the lower part of the inner end surface of the sliding section and a fourth sealing ring is installed, a fifth ring groove is provided on the lower end surface of the upper pressure section and a fifth sealing ring is installed, and sixth ring grooves are provided on both sides of the upper end surface of the lower pressure section and a sixth sealing ring is installed; when the corresponding hydraulic cylinder presses the lower pressure section tightly against the lower end surface of the bottom plate, the lower pressure section forms a seal with the bottom plate through the sixth sealing ring, the sliding section forms a seal with the slideway through the fourth sealing ring, and the sliding section forms a seal with the socket steel ring of the prestressed steel cylinder concrete pipe through the third sealing ring; when the corresponding hydraulic cylinder pressure is removed and the upper pressure section is pressed against the upper end surface of the bottom plate, the upper pressure section forms a seal with the bottom plate through the fifth sealing ring, and the sliding section forms a seal with the slideway through the third sealing ring.

6. The multi-task combined finished product internal pressure testing machine according to claim 5 is characterized in that: The upper and lower ports of the slideway are both provided with bell mouths open outwards.

7. The multi-task combined finished product internal pressure testing machine according to claim 6 is characterized in that: Each group of hydraulic cylinders is evenly distributed along the circumference of the corresponding lower insert ring, and the number of hydraulic cylinders in each group is at least two.

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