CN114563137B - A device and method for testing the waterproof performance of a shield tunnel joint double-channel gasket - Google Patents

Abstract

The invention relates to the technical field of tunnels and underground engineering, in particular to a device and a method for testing the waterproof performance of a double-channel sealing gasket of a seam of a shield tunnel. The invention realizes that the compression is carried out firstly, and then the dislocation occurs under the disturbance, which is closer to the actual working condition, and the test result is more accurate.

Description

A device and method for testing the waterproof performance of a shield tunnel joint double-channel gasket

technical field

The invention relates to the technical field of tunnels and underground engineering, in particular to a device for testing the waterproof performance of a shield tunnel joint double-channel sealing gasket. In addition, the invention also relates to a testing method of a waterproof performance testing device of a sealing gasket.

Background technique

With the rapid development of urbanization in my country, the construction of tunnels such as subways and river passages is in great demand. As the main tunnel form, shield tunnels play an important role. The waterproof problem of underground engineering has always been concerned by the majority of technicians. For shield tunnels, due to long-term immersion and corrosion by groundwater, waterproof performance is very important. The waterproofing of the shield tunnel is not only related to the normal functioning of the tunnel, but also to the length of the tunnel's service life. Shield tunnel waterproofing includes segment self-waterproofing, seam waterproofing and hand-hole waterproofing. Among them, segment lining blocks are produced in prefabricated factories, with guaranteed production quality, good impermeability and the most mature. Waterproofing of the seam between the rings. Due to the differences in tunnel engineering geological conditions and tunnel structures, the waterproof design conditions are different, so a large number of simulation tests are often required to select suitable joint waterproof materials and cross-section types. At present, most of the projects use EPDM porous rubber gaskets with a single material (good chemical stability, excellent aging resistance and water resistance), and there are also composite gaskets composed of EPDM porous rubber and water-absorbing swelling rubber. The principle of sealing is that under a certain pressure, the internal stress generated by the deformation of the inner hole of the sealing strip causes huge stress on the two contact surfaces to seal the water.

In the existing test device for waterproof performance of seam double-channel gaskets, the displacement amount is preset in the test process, that is, the stress state of the gasket is first displacement and then compression. However, in the actual engineering environment, the joint may be deformed by the outward angle. Under this deformation, there will be a certain difference in the opening amount of the gaskets arranged in the double-lane arrangement, and the existing test cannot reflect this difference. At the same time, the actual service environment of the gasket is that it is compressed first, and then misaligned under the disturbance. During this process, the gasket is in a stress state under the composite compressive-shear stress under the combined action of the compressive force and the friction force between the rubber, which is the same as the current state. Some devices pre-set the wrong amount and then set the opening amount, the process is inconsistent. The above test errors will lead to the inaccuracy of the waterproof performance of the gasket obtained by the test.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present invention is to overcome the defect of pre-setting the staggered amount and then setting the opening amount during the test of the existing test device, which is inconsistent with the actual situation, so as to provide a waterproof performance of a shield tunnel joint double-channel gasket test device.

Another technical problem to be solved by the present invention is to provide a testing method for the above-mentioned testing device.

A device for testing the waterproof performance of a shield tunnel joint double-channel sealing gasket, comprising a combined cover plate, a displacement loading frame for placing the combined cover plate, and a hydraulic loading capable of extending to a closed space formed by the sealing gasket and the combined cover plate system;

The combined cover plate includes an upper cover plate for applying positive pressure to the working surface of the gasket, a lower cover plate 1 and a lower cover plate 2 located below the upper cover plate, and the lower cover plate 2 has an accommodating lower cover plate. One lower cover plate and two grooves, the bottom of the upper cover plate is provided with annular inner channel grooves of the upper cover plate and outer channel grooves of the upper cover plate in sequence from the inside to the outside, the inner channel grooves of the upper cover plate and the upper cover plate The grooves of the outer channel of the plate correspond to the grooves of the lower cover plate 1 of the lower cover plate 1 and the grooves of the lower cover plate 2 of the lower cover plate 2 respectively, and between the inner channel groove of the upper cover plate and the groove of the lower cover plate 1, and an annular gasket is arranged between the outer channel groove of the upper cover plate and the second groove of the lower cover plate, and the upper cover plate and the second lower cover plate are connected by cover plate connecting bolts;

The displacement loading frame is used to apply lateral shear force to the working surface of the gasket, and it includes a U-shaped frame and a detachable top plate embedded in the top of the U-shaped frame, and a bottom plate for placing the U-shaped frame is provided at the bottom. The movable sliding rail of the combined cover plate, the side of the U-shaped frame is provided with a horizontal jack, and the jack head extends into the U-shaped frame and points to the lower cover plate two (3) inside the U-shaped frame, so that the lower cover The second plate (3) can translate relative to the upper cover plate (1).

As a preference of the testing device in the present invention, the hydraulic loading system includes a hydraulic pump, and a measurement loading channel connected to the hydraulic pump through the upper cover plate, and the measurement loading channel is arranged in the inner channel groove of the upper cover plate and the annular gasket between a groove of the lower cover plate, and between adjacent annular gaskets.

As a preference of the testing device in the present invention, the side length dimension of the second lower cover plate groove is the same as the side length dimension of the lower cover plate 1, and its depth is greater than the thickness of the lower cover plate 1; A gasket is arranged between the bottom of the groove and the bottom of the first lower cover, which is used to adjust the height difference between the working surfaces of the first lower cover and the second lower cover.

As a preference of the testing device in the present invention, the thickness of the gasket includes 2 mm, 4 mm, 6 mm, 8 mm and 10 mm, and the gasket is a square cast iron gasket.

As a preference of the testing device in the present invention, the measurement loading channel includes an external water cavity water pressure gauge connection hole arranged between the inner channel groove of the upper cover plate and the outer channel groove of the upper cover plate, and the water inlet of the external water cavity The hole and the external water cavity exhaust hole are arranged on the inner water cavity water pressure gauge connection hole, the internal water cavity water inlet hole and the internal water cavity exhaust hole on the inner side of the inner channel groove of the upper cover plate.

As a preference of the testing device in the present invention, the external water cavity water pressure gauge connection hole and the inner water cavity water pressure gauge connection hole are further provided with an external water cavity water pressure gauge and an internal water cavity water pressure gauge inserted into the interior of the combined cover along the connection holes. Water chamber water pressure gauge.

As a preference of the testing device in the present invention, the outer groove of the upper cover plate is provided with elongated bolt holes of the upper cover plate that are evenly spaced along the edge of the upper cover plate, and the outer sides of the second groove of the lower cover plate are provided There are two elongated bolt holes of the lower cover plate that are evenly spaced along the two edges of the lower cover plate, and the top plate is provided with elongated bolt holes of the top plate that are evenly spaced along its edge. After the device is assembled, the upper cover plate The positions of the elongated bolt holes, the second elongated bolt holes of the lower cover, and the elongated bolt holes of the top flat plate correspond to each other.

As a preference of the testing device in the present invention, a circle of round bolt holes on the top flat plate are arranged evenly spaced between the elongated bolt holes of the top flat plate and the edge of the top flat plate. After the top flat plate is embedded in the top of the U-shaped frame, the The positions of the round bolt holes of the top flat plate and the round bolt holes of the U-shaped frame arranged at the bottom of the U-shaped frame correspond to each other.

The present invention also provides a test method for a device for testing the waterproof performance of a shield tunnel joint double-channel sealing gasket, comprising the following steps:

S1: paste the inner channel sealing gasket and the outer channel sealing gasket on the inner channel groove of the upper cover plate and the outer channel groove of the upper cover plate and the first groove of the lower cover plate and the second groove of the lower cover plate;

S2: Select a gasket of corresponding thickness and place it in the second groove of the lower cover plate, and insert the lower cover plate 1 into the second groove of the lower cover plate, so that there is a difference in the opening amount between the inner gasket and the outer gasket. The board is hoisted to the second top surface of the lower cover and aligned;

S3: Pass the cover plate connecting bolts through the long strip bolt holes of the upper cover plate and the two long strip bolt holes of the lower cover plate, and tighten the cover plate connecting bolts;

S4: Lift the combined cover plate on the slide rail on the bottom surface of the U-shaped frame;

S5: Insert the top plate of the outer frame into the top of the U-shaped frame, pass the frame connecting bolts through the round bolt holes of the top plate and the round bolt holes of the U-shaped frame, and tighten the frame connecting bolts until the gap between the cover plate reaches the set opening amount;

S6: Remove the cover plate connecting bolts, start the jack, and make the jack push the lower cover plate 2 from the side at a set speed, so that the working surfaces of the upper and lower cover plates are staggered to the set offset amount;

S7: Pass the cover plate connecting bolts through the long strip bolt holes of the upper cover plate and the two long strip bolt holes of the lower cover plate again, tighten the cover plate connecting bolts, remove the frame connecting bolts, and take off the top plate;

S8: Connect the inner water chamber water pressure gauge and the outer water chamber water pressure gauge connection hole respectively to the inner water chamber water pressure gauge and the outer water chamber water pressure gauge, and open the inner water chamber water inlet hole and the outer water chamber water inlet hole The valve is filled with water, the air is discharged through the internal water cavity vent hole and the external water cavity vent hole, the valve of the internal water cavity vent hole and the external water cavity water inlet hole is closed, and the water pressure loading is started;

S9: When there is water flowing out from the vent hole of the external water cavity, it means that the waterproofing of the inner channel sealing gasket is invalid, and the indication of the water pressure gauge of the internal water cavity is recorded;

S10: Close the valve of the external water cavity exhaust hole, continue to load the water pressure until the waterproofing of the external seal gasket fails, and record the data change of the external water cavity water pressure gauge;

S11: Both the inner and outer gaskets are waterproof and fail. After the test is over, replace the test piece, repeat S1~S10, and measure the waterproof limit water pressure of the double-channel gaskets when the waterproofing fails under the misalignment of multiple sets of longitudinal seams and the opening deformation. .

As a preferred test method in the present invention, in S1, it is necessary to wait for 24 hours after pasting, so that the adhesive takes effect;

In S8, the air is exhausted so that the water fills the airtight space.

The technical scheme of the present invention has the following advantages:

1. In the present invention, the two-phase combination of the upper cover plate, the lower cover plate and the lower cover plate is used to obtain two inner and outer gaskets that are not synchronously compressed, forming two closed spaces inside and outside, and realizing the joint double gasket inside and outside. The leakage simulation of the two gaskets with different openings; by setting the difference between the inner and outer two gaskets with different openings, the waterproof performance test of the double elastic gaskets under different corner deformations at the longitudinal seams of the segment joints is realized. The evolution law of waterproof performance of the gasket provides the experimental basis;

2. In the present invention, the cover plate is pushed by the jack, so as to realize the dynamic staggering process from the aligned state to the gradually generating the staggered amount between the gaskets. In this dislocation process, the gasket is not only affected by the compressive stress, but also affected by the frictional force of the mutual dislocation between the rubbers. This process is similar to the process of opening and dislocation of the joints between rings when the overall longitudinal deformation of the tunnel occurs under the action of external loads. Through the waterproof performance test of the double-channel gasket that is in the compressed state and then dislocated, the waterproof performance test data of the gasket is closer to the waterproof performance of the actual annular seam gasket during service, and more accurate and reliable test results are obtained.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

Fig. 1 is the front sectional structure schematic diagram of the present invention;

Fig. 2 is the bottom view schematic diagram of the upper cover plate of the present invention;

Fig. 3 is a top view of the lower cover plate of the present invention;

4 is a top view of the second lower cover plate of the present invention;

5 is a schematic diagram of a combined cover plate of the present invention;

Fig. 6 is the top plan view of the outer frame top plate of the present invention;

Fig. 7 is the top view of the U-shaped frame of the outer frame of the present invention;

Description of reference numbers:

1. Upper cover; 2. Lower cover 1; 3. Lower cover 2; 4. Outer groove on upper cover; 5. Inner groove on upper cover; 6. Strip bolt hole on upper cover; 7. Connection hole for water pressure gauge in inner water chamber; 8. Water inlet hole in inner water chamber; 9. Exhaust hole in inner water chamber; 10. Connection hole for water pressure gauge in outer water chamber; 11. Water inlet hole in outer water chamber; 12 , external water cavity exhaust hole; 13, a groove on the lower cover; 14, two grooves on the lower cover; 15, two long strip bolt holes on the lower cover; 16, two grooves on the lower cover; 17, top Flat plate; 18. Long strip bolt holes on the top flat plate; 19. Round bolt holes on the top flat plate; 20. U-shaped frame; 21. U-shaped frame round bolt holes; 22. Jack; 23. Slide rail; 24. Frame connecting bolts; 25. Cover plate connecting bolts; 26. Internal water chamber water pressure gauge; 27. External water chamber water pressure gauge; 28. Gasket; 29. Inner channel gasket; 30, Outer channel gasket.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

This embodiment provides a device for testing the waterproof performance of a shield tunnel joint double-channel gasket, as shown in Figures 1-7, including a combined cover plate, a displacement loading frame for placing the combined cover plate, and a device that can extend to The hydraulic loading system of the closed space formed by the pad and the combined cover plate;

The combined cover plate includes an upper cover plate 1 for applying positive pressure to the working surface of the gasket, a lower cover plate 1 2 and a lower cover plate 2 3 located below the upper cover plate 1, and the lower cover plate 2 3 has. A lower cover plate two grooves 16 for accommodating the lower cover plate 1 2, the bottom of the upper cover plate 1 is sequentially provided with an annular upper cover plate inner channel 5 and an upper cover plate outer channel groove 4 from the inside to the outside. The inner channel groove 5 of the upper cover plate and the outer channel channel 4 of the upper cover plate correspond to the lower cover plate 1 groove 13 of the lower cover plate 1 2 and the lower cover plate 2 groove 14 of the lower cover plate 2 3 respectively. An annular gasket is provided between the inner channel groove 5 of the cover plate and the first groove 13 of the lower cover plate, and between the outer channel groove 4 of the upper cover plate and the second groove 14 of the lower cover plate. The lower cover plate II 3 is connected by cover plate connecting bolts 25;

The displacement loading frame is used to apply lateral shear force to the working surface of the gasket, and it includes a U-shaped frame 20 and a detachable top plate 17 embedded in the top of the U-shaped frame 20. The bottom of the U-shaped frame 20 is provided with a A movable sliding rail 23 for placing the combined cover plate, a horizontal jack 22 is provided on the side of the U-shaped frame 20, and the jack 22 extends into the U-shaped frame 20 and points to the lower cover inside the U-shaped frame 20 plate two 3, so that the lower cover plate two 3 can translate relative to the upper cover plate 1;

In this embodiment, the hydraulic loading system includes a hydraulic pump, and a measurement loading channel connected to the hydraulic pump through the upper cover plate 1 , and the measurement loading channel is provided in the inner channel groove 5 of the upper cover plate and the lower cover Inside the annular gasket between the grooves 13 of the plate, and between adjacent annular gaskets.

By adopting the above structure, the leakage simulation of the joint double-channel gasket with different openings of the inner and outer gaskets is realized by combining the cover plates; by setting the difference between the inner and outer gaskets with different openings, the longitudinal seam of the segment joint is realized. The waterproof performance test of the double-channel elastic gasket under different corner deformations provides a test basis for the evolution law of the waterproof performance of the joint double-channel gasket.

The process of the jack 22 pushing the cover plate is similar to the process when the tunnel is longitudinally deformed under the action of external loads in the actual working condition, and the gap between the rings is opened and dislocated. Through the waterproof performance test of the double-channel gasket that is in the compressed state and then has displacement dislocation, the waterproof performance test data of the gasket is closer to the waterproof performance of the actual annular seam gasket during service.

In this embodiment, the side length dimension of the second lower cover plate groove 16 is the same as the side length dimension of the lower cover plate 1 2, and its depth is greater than the thickness of the lower cover plate 1 2; A gasket 28 is arranged between the bottom of the lower cover plate 16 and the bottom of the lower cover plate 1 2, which is used to adjust the working surface heights of the lower cover plate 1 2 and the lower cover plate 2 3 so that there is a tensor difference or no tensor difference.

With the above structure, the lower cover plate 1 2 is placed on the gasket 28 to change the height difference between the working surface of the lower cover plate 1 2 and the working surface of the lower cover plate 2 3, so as to achieve the difference in the opening of the inner sealing gasket 29 and the outer sealing gasket 30. For the purpose of value, when it is satisfied that the gasket has a tensor height difference, the height of the gasket 28 plus the lower cover plate one 2 is greater than or smaller than the depth of the groove 16 of the lower cover plate two, when it is satisfied that there is no tension in the gasket. When measuring the height difference, the height of the gasket 28 plus the lower cover plate 1 2 is equal to the depth of the groove 16 of the lower cover plate 2 .

In this embodiment, the thickness of the gasket 28 includes 2 mm, 4 mm, 6 mm, 8 mm and 10 mm, and the gasket 28 is a square cast iron gasket.

With the above structure, the gasket 28 can be selected from a variety of square cast iron gaskets with different thicknesses, which is convenient for testers to quickly adjust the thickness of the gasket 28 according to different requirements.

In this embodiment, the measurement loading channel includes an external water cavity water pressure gauge connection hole 10 and an external water cavity water inlet hole 11 arranged between the inner channel groove 5 of the upper cover plate and the outer channel groove 4 of the upper cover plate. And the external water cavity exhaust hole 12, the internal water cavity water pressure gauge connection hole 7, the internal water cavity water inlet hole 8 and the internal water cavity exhaust hole 9 are arranged on the inner side of the inner channel groove 5 of the upper cover plate.

With the above structure, the inner water cavity water inlet hole 8 and the outer water cavity water inlet hole 11 are used to inject water into the interior of the combined cover plate during the experiment; the inner water cavity exhaust hole 9 and the outer water cavity exhaust hole 12 are used for In the process of water filling inside the combined cover plate, the air in it is discharged to ensure that the interior is filled with water and there is no gap.

In this embodiment, the outer water cavity water pressure gauge connection hole 10 and the inner water cavity water pressure gauge connection hole 7 are also provided with an outer water cavity water pressure gauge 27 and an inner water cavity water pressure gauge inserted into the interior of the combined cover along the connection holes. Water pressure gauge 26.

With the above structure, the inner water chamber water pressure gauge 26 is used to record the pressure when water flows out of the outer water chamber exhaust hole 12, that is, the inner channel sealing gasket 29 is waterproof; the outer water chamber water pressure gauge 27 is used to record the current When the sealing gasket 29 fails, after closing the valve of the external water cavity exhaust hole 12, the water pressure continues to be loaded to the water pressure change when the waterproofing of the outer sealing gasket 30 fails.

In this embodiment, the outer channel groove 4 of the upper cover plate is provided with elongated bolt holes 6 of the upper cover plate that are evenly spaced along the edge of the upper cover plate 1, and the outer side of the second groove 14 of the lower cover plate is provided with The lower cover plate 2 has long strip bolt holes 15 evenly spaced along the edge of the lower cover plate 2 3. The top flat plate 17 is provided with top flat plate long strip bolt holes 18 evenly spaced along its edge. After the device is assembled, The positions of the elongated bolt holes 6 of the upper cover plate, the second elongated bolt holes 15 of the lower cover plate, and the elongated bolt holes 18 of the top flat plate correspond to each other.

With the above structure, the upper cover plate 1, the lower cover plate 1 2 and the lower cover plate are connected to the upper cover plate 1, the lower cover plate 1 2 and the lower cover plate through the cover plate connecting bolts 25 passing through the upper cover plate long strip bolt holes 6 and the lower cover plate two long strip bolt holes 15. The two 3 connections form a whole, which is convenient to hoist it during the experiment and put it into the U-shaped frame 20; The jack 22 can push the lower cover plate 2 3 on the side, so that the upper cover plate 1 and the working surfaces of the two lower cover plates are shifted to the set shift amount.

In this embodiment, a circle of round bolt holes 19 on the top flat plate are arranged evenly spaced between the elongated bolt holes 18 of the top flat plate and the edge of the top flat plate 17. After the top flat plate 17 is embedded in the top of the U-shaped frame 20, the The positions of the top plate round bolt holes 19 and the U-shaped frame round bolt holes 21 provided at the bottom of the U-shaped frame 20 correspond to each other.

With the above structure, the frame connecting bolts 24 pass through the top plate round bolt holes 19 and the U-shaped frame round bolt holes 21, and adjust the tightness to make the cover plate gap reach the set opening amount.

Example 2

The present embodiment is the test method of the test device in the embodiment 1;

S1: Paste the inner channel gasket 29 and the outer channel gasket 30 on the inner channel groove 5 of the upper cover plate, the outer channel channel 4 of the upper cover plate, the first channel groove 13 of the lower cover plate and the second channel 14 of the lower cover plate, and wait for 24 The adhesive takes effect after hours;

S2: Select the gasket 28 of the corresponding thickness and place it in the groove 16 of the second lower cover plate so that the working surfaces of the lower cover plate 1 2 and the lower cover plate 2 3 are flush, and insert the lower cover plate 1 2 into the lower cover plate 2 The groove 16 is used to hoist the upper cover plate 1 to the top surface of the lower cover plate 2 3 and align it;

S3: Pass the cover plate connecting bolts 25 through the long strip bolt holes 6 of the upper cover plate and the second long strip bolt holes 15 of the lower cover plate, and tighten the cover plate connecting bolts 25 to facilitate the overall lifting of the combined cover plate;

S4: hoist the combined cover plate as a whole to the slide rail 23 on the bottom surface of the U-shaped frame 20;

S5: Embed the top plate 17 of the outer frame into the top of the U-shaped frame 20, pass the frame connecting bolts 24 through the round bolt holes 19 of the top plate and the round bolt holes 21 of the U-shaped frame, and tighten the frame connecting bolts 24 until the cover plate gap reaches the set value opening amount;

S6: Remove the cover plate connecting bolts 25, start the jack 22, so that the jack 22 pushes the lower cover plate 23 from the side at a certain speed, so that the working surfaces of the upper and lower cover plates are shifted to the set amount of misalignment;

S7: Put the cover plate connecting bolts 25 through the long strip bolt holes 6 of the upper cover plate and the second long strip bolt holes 15 of the lower cover plate again, tighten the cover plate connecting bolts 25, remove the frame connecting bolts 24, and take off the top plate 17 ;

S8: Connect the inner water chamber water pressure gauge 26 and the outer water chamber water pressure gauge 27 to the inner water chamber water pressure gauge connection hole 7 and the outer water chamber water pressure gauge connection hole 10 respectively, and open the inner water chamber water inlet hole 8 and the outer water chamber water pressure gauge 27. The valve of the water cavity inlet hole 11 is filled with water, and the air is exhausted through the inner water cavity exhaust hole 9 and the outer water cavity exhaust hole 12. After the air is exhausted, close the inner water cavity exhaust hole 9 and the outer water cavity water inlet hole. 11 valve, start hydraulic loading;

S9: When water flows out of the external water cavity vent 12, it means that the inner channel sealing gasket 29 is waterproof, and the indication of the internal water cavity water pressure gauge 26 is recorded;

S10: Close the valve of the external water cavity exhaust hole 12, continue to load the water pressure to the outer channel gasket 30 for waterproof failure, and record the data change of the external water cavity water pressure gauge 27;

S11: Both the inner sealing gasket 29 and the outer sealing gasket 30 are waterproof and fail, and the test ends. Replace the test piece, repeat the process of S1~S10 to measure the waterproof failure process and waterproof capacity of the double-channel gasket under different longitudinal seam staggered and open deformation.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.

Claims (10)

1. a shield tunnel joint double-channel sealing gasket waterproof performance testing device, it is characterized in that, comprise combination cover plate, the displacement loading frame that is used for placing combination cover plate and can be extended to be formed by sealing gasket and combination cover plate. Hydraulic loading system for confined spaces; The combined cover plate comprises an upper cover plate (1) for applying positive pressure to the working surface of the gasket, and a lower cover plate (2) and a lower cover plate two (3) located below the upper cover plate (1), The second lower cover plate (3) has a second lower cover plate groove (16) for accommodating the lower cover plate one (2), and the bottom of the upper cover plate (1) is sequentially provided with an annular upper cover plate from the inside to the outside. The inner channel groove (5) and the outer channel channel (4) of the upper cover plate, the inner channel channel (5) of the upper cover plate and the outer channel channel (4) of the upper cover plate are respectively connected with those provided in the lower cover plate one (2) The first groove (13) of the lower cover plate and the second groove (14) of the lower cover plate of the second cover plate (3) correspond to each other, and the inner channel groove (5) of the upper cover plate and the groove (13) of the lower cover plate ), and between the outer channel groove (4) of the upper cover plate and the second groove (14) of the lower cover plate, annular gaskets are provided, and the upper cover plate (1) and the second lower cover plate (3) pass through The cover plate connecting bolts (25) are connected; The displacement loading frame is used to apply lateral shear force to the working face of the gasket, and includes a U-shaped frame (20) and a detachable top plate (17) embedded in the top of the U-shaped frame (20). The bottom of the U-shaped frame (20) is provided with a movable sliding rail (23) for placing the combined cover plate, and a horizontal jack (22) is provided on the side of the U-shaped frame (20), and the jack (22) extends upwards into the U-shaped frame (20) and point to the lower cover plate two (3) inside the U-shaped frame (20), so that the lower cover plate two (3) can translate relative to the upper cover plate (1). 2. The device for testing the waterproof performance of shield tunnel joint double-channel gaskets according to claim 1, characterized in that the hydraulic loading system comprises a hydraulic pump, and a hydraulic pump connected to the hydraulic pump through the upper cover plate (1). The measurement loading channel is provided within the annular sealing gasket between the inner channel groove (5) of the upper cover plate and a groove (13) of the lower cover plate, and between adjacent annular sealing gaskets. 3. The device for testing the waterproof performance of shield tunnel joint double-channel gaskets according to claim 2, wherein the side length dimension of the second groove (16) of the lower cover plate is the same as that of the first lower cover plate (2). The side lengths are the same, and the depth is greater than the thickness of the lower cover plate 1 (2); a gasket (28) is arranged between the bottom of the second lower cover plate groove (16) and the bottom of the lower cover plate 1 (2), It is used to adjust the height difference between the lower cover plate one (2) and the lower cover plate two (3). 4. The device for testing the waterproof performance of a shield tunnel joint double-channel gasket according to claim 3, wherein the gasket (28) has a thickness of 2mm, 4mm, 6mm, 8mm and 10mm, and the gasket (28) is a square cast iron gasket. 5. The device for testing the waterproof performance of a shield tunnel joint double-channel gasket according to claim 4, wherein the measurement loading channel comprises an inner channel groove (5) provided on the upper cover plate and an outer channel channel on the upper cover plate. The external water cavity water pressure gauge connection hole (10), the external water cavity water inlet hole (11) and the external water cavity exhaust hole (12) between the grooves (4) are arranged in the inner channel groove (5) of the upper cover plate ) inside the inner water cavity water pressure gauge connection hole (7), the inner water cavity water inlet hole (8) and the inner water cavity exhaust hole (9). 6. The device for testing the waterproof performance of a shield tunnel joint double-channel gasket according to claim 5, characterized in that the outer water cavity water pressure gauge connection hole (10) and the inner water cavity water pressure gauge connection hole (7 ) is also provided with an external water cavity water pressure gauge (27) and an internal water cavity water pressure gauge (26) inserted into the interior of the combined cover plate along the connecting hole. 7. The device for testing the waterproof performance of shield tunnel joint double-channel gaskets according to claim 6, characterized in that the outer groove (4) of the upper cover plate is provided with uniform intervals along the edge of the upper cover plate (1). The long strip bolt holes (6) of the upper cover plate are provided, and the outer side of the second groove (14) of the lower cover plate is provided with two long strip bolt holes of the lower cover plate that are evenly spaced along the edge of the second cover plate (3). (15), the top plate (17) is provided with top plate elongated bolt holes (18) evenly spaced along its edge, after the device is assembled, the upper cover plate elongated bolt holes (6), the lower cover The positions of the long strip bolt holes (15) on the second plate and the long strip bolt holes (18) on the top plate correspond to each other. 8. The device for testing the waterproof performance of a shield tunnel joint double-channel gasket according to claim 7, characterized in that a circle is provided between the long bolt hole (18) of the top flat plate and the edge of the top flat plate (17). The round bolt holes (19) on the top flat plate are evenly spaced. After the top flat plate (17) is embedded in the top of the U-shaped frame (20), the round bolt holes (19) on the top flat plate are connected with the U-shaped round bolt holes (19) arranged at the bottom of the U-shaped frame (20). The positions of the round bolt holes (21) of the type frame correspond to each other. 9. A test method based on the shield tunnel joint double-channel sealing gasket waterproof performance testing device of claim 8, characterized in that, comprising the steps: S1: Paste the inner channel gasket (29) on the inner channel groove (5) of the upper cover plate and a groove (13) in the lower cover plate, and paste the outer channel gasket (30) on the outer channel groove (4) of the upper cover plate ) and the second groove (14) of the lower cover; S2: Select the gasket (28) of the corresponding thickness and place it in the second groove (16) of the lower cover, and insert the first (2) of the lower cover into the second groove (16) of the lower cover, so that the inner gasket (29) ) and the working surface of the outer channel gasket (30) have a difference in opening amount, hoist the upper cover plate (1) to the top surface of the second cover plate (3) and align it; S3: Pass the cover plate connecting bolts (25) through the upper cover plate long strip bolt holes (6) and the lower cover plate two long strip bolt holes (15), and tighten the cover plate connecting bolts (25); S4: hoist the combined cover plate on the slide rail (23) on the bottom surface of the U-shaped frame (20); S5: Insert the top plate (17) of the outer frame into the top of the U-shaped frame (20), pass the frame connecting bolts (24) through the round bolt holes (19) of the top plate and the round bolt holes (21) of the U-shaped frame, and tighten the frame The gap between the connecting bolt (24) and the cover plate reaches the set opening amount; S6: Remove the cover plate connecting bolts (25), start the jack (22), and make the jack (22) push the lower cover plate two (3) from the side at a set speed, so that the working surfaces of the upper and lower cover plates move to the set wrong stage quantity; S7: Pass the cover connecting bolts (25) through the long bolt holes (6) of the upper cover and the second long bolt holes (15) of the lower cover again, tighten the connecting bolts (25) of the cover, and remove the frame connection Bolt (24), remove the top plate (17); S8: Connect the inner water chamber water pressure gauge (26) and the outer water chamber water pressure gauge (27) to the inner water chamber water pressure gauge connection hole (7) and the outer water chamber water pressure gauge connection hole (10) respectively, and open the inner water chamber water pressure gauge (27). The valves of the water cavity inlet hole (8) and the outer water cavity inlet hole (11) are filled with water, and the air is discharged through the inner water cavity exhaust hole (9) and the outer water cavity exhaust hole (12), and the inner water cavity is closed. The valve of the exhaust hole (9) and the water inlet hole (11) of the external water cavity starts the hydraulic loading; S9: When water flows out of the external water cavity vent (12), it means that the inner channel gasket (29) is waterproof and fails, and the indication of the internal water cavity water pressure gauge (26) is recorded; S10: Close the valve of the external water cavity exhaust hole (12), continue to load the water pressure to the waterproof failure of the external channel gasket (30), and record the data change of the external water cavity water pressure gauge (27); S11: Both the inner gasket (29) and the outer gasket (30) are waterproof and fail. After the test is over, replace the test piece, repeat S1~S10, and measure the waterproof failure of the double-channel gasket under the misalignment of multiple sets of longitudinal seams and the opening deformation. waterproof limit water pressure. 10. test method according to claim 9, is characterized in that, in S1, need to wait 24 hours after pasting, to make adhesive take effect; In S8, the air is exhausted so that the water fills the airtight space.

Images