CN110593323B - Water stop back pressure leakage-proof system for immersed tube and back pressure leakage-proof method - Google Patents
Water stop back pressure leakage-proof system for immersed tube and back pressure leakage-proof method Download PDFInfo
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- CN110593323B CN110593323B CN201910904326.XA CN201910904326A CN110593323B CN 110593323 B CN110593323 B CN 110593323B CN 201910904326 A CN201910904326 A CN 201910904326A CN 110593323 B CN110593323 B CN 110593323B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/063—Tunnels submerged into, or built in, open water
- E02D29/073—Tunnels or shuttering therefor assembled from sections individually sunk onto, or laid on, the water-bed, e.g. in a preformed trench
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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Abstract
The invention discloses a back pressure leakage-proof system and a back pressure leakage-proof method of a waterstop for a immersed tube, which comprises a water stopping device and a back pressure device, wherein the water stopping device is provided with the waterstop, and one end surface of the waterstop is provided with a standby pressure surface and a water stopping part; the back pressure device is provided with a back pressure component, and the back pressure component comprises a back pressure frame with a back pressure edge on the end surface; at the joint of the first immersed tube and the second immersed tube which are butted in front and back, the water stopping device is arranged on the end surface of the first immersed tube, the water stopping part is attached to and pressed on the end surface of the second immersed tube, the back pressure device is arranged on the end surface of the second immersed tube, and the back pressure edge on the back pressure frame can be tightly pressed on the standby pressure surface of water stopping. The invention has the advantages that: once the waterstop leaks, permanent repair and water stop can be performed in time, and the operation is simple and convenient. After the life cycle is reached, if the leakage-proof device is not started, the immersed tube tunnel can be safely used for a long period of time on the premise that the quality of other key facilities still reaches the standard.
Description
Technical Field
The invention relates to a back-pressure leakage-proof system and a back-pressure leakage-proof method for a waterstop for a immersed tube, and belongs to the technical field of underwater engineering.
Background
The underwater immersed tube tunnel is formed by butt-jointing several sections of immersed tubes in sequence on a foundation bed constructed under the water (sea bottom, river bottom or lake bottom, etc.), and in order to prevent the water leakage of the joint of two sections of immersed tubes, a water stop belt with compression elasticity is used between the joint of two sections of immersed tubes. The water stop belt is in an integral strip shape, the compression amount of the water stop belt needs to ensure that the seismic fortification intensity is more than VII, and the sealing and water stopping can be ensured between the immersed tube joint parts in the violent earthquake process; meanwhile, the functions of buffering impact between the immersed tubes and converting and releasing seismic energy are achieved, so that the safety of the whole tunnel is ensured.
Due to the complex water bottom geological condition, the foundation beds of all the sections of the tunnel are inevitably subjected to differential settlement and even distortion to a certain degree within the life cycle of more than one hundred years, and the distortion and the differential settlement are particularly obvious after strong earthquake. Although the waterstop can completely cope with the earthquake disaster in the whole life cycle of the immersed tunnel according to the technical requirements in the field, in practice, after the large geological catastrophe really occurs, it is difficult to ensure that the joint of the immersed tunnel does not leak at all. In addition, it is worth considering in our current design that the sinking tunnel can be safely used for a period of time after approaching or reaching the life cycle of use.
For the above reasons, we can easily see the defects of the prior art:
in the prior art, the waterstop is tightly attached to the end face of the immersed tube joint by one or two waterstop edges to realize sealing and waterstop, the selected materials and structural arrangement form of the waterstop adopt a life cycle of more than one hundred years as a standard, but no arrangement capable of repairing and remedying exists, and once small external water leaks inwards, the tunnel can be maintained to be used only in a leakage collecting and pumping mode; if large leakage occurs, the tunnel section where the leakage is located must be immediately sealed, and the related devices, even the immersed tube, are replaced and repaired, which is difficult to think of the large engineering.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing immersed tube water stop technology can not simply and quickly carry out permanent repair when external water leaks inwards.
Aiming at the problems, the technical scheme provided by the invention is as follows:
a waterstop back pressure leakage-proof system for a immersed tube comprises a water stopping device and a back pressure device, wherein the water stopping device is provided with a waterstop, and one end face of the waterstop is provided with a pressure surface and a water stopping part; the back pressure device is provided with a back pressure component, and the back pressure component comprises a back pressure frame with a back pressure edge on the end surface; at the joint of the front and back butted immersed tube I and immersed tube II, the water stopping device is arranged on the end surface of the immersed tube I, the water stopping part is attached to and pressed on the end surface of the immersed tube II, the back pressure device is arranged on the end surface of the immersed tube II, and the back pressure edge on the back pressure frame can be tightly pressed on the standby pressure surface of the water stopping belt.
The arrangement modes of the water stopping device and the back pressure device which are respectively arranged on the end face of the first immersed tube and the end face of the second immersed tube can also be reversed, namely the water stopping device and the back pressure device are respectively arranged on the end face of the second immersed tube and the end face of the first immersed tube.
Further, the back pressure edge is provided with a streamline sliding surface, the section of the back pressure edge is narrowed from the base to the top, and the top interface side line of the back pressure edge is a curve.
Furthermore, the pressure frame is an integral frame, and the structural shape of the pressure frame corresponds to that of the cross section of the immersed tube II.
Further, the backpressure assembly also comprises a propeller, the propeller comprises a mounting body, a screwing bolt and a positioning guide body with a bolt hole, the positioning guide body is fixed on the mounting body, and one end of the screwing bolt is in contact with the backpressure frame through the bolt hole of the positioning guide body.
The mounting body is provided with a mounting hole, and the mounting body is mounted on the second immersed tube through the mounting hole.
Further, it is characterized in that: the screw-in bolt clamping device is characterized in that a limiting buckle is arranged at one end, contacting with a counter-pressure frame, of the screw-in bolt, a buckling buckle is arranged at the end face, contacting with one end of the screw-in bolt, of the counter-pressure frame, and the limiting buckle is located in the buckling buckle and can rotate in the buckling buckle.
Further, the back pressure device is also provided with a sealing assembly, and the sealing assembly comprises a sealing adhesive tape with high elasticity and corrosion resistance and a sealing strip; two sides of the sealing adhesive tape are tightly pressed in a sealing groove formed in the two end faces of the immersed tube by the sealing adhesive tape, and the whole back pressure assembly is covered by the sealing adhesive tape and is sealed in the end face of the second immersed tube.
Furthermore, the sealing assembly also comprises a double-layer sliding film which is stacked by a sliding film I and a sliding film II, the double-layer sliding film is covered on the outer surface of the sealing adhesive tape, and two side edges of the double-layer sliding film are respectively stacked with two side edges of the double-layer sliding film and pressed in the sealing groove by the sealing strip.
Furthermore, the water stopping components are two water stopping edges symmetrically arranged on two sides of the pressure preparation surface, and the two water stopping edges are respectively attached to the end surfaces of the second immersed tubes on two sides of the sealing adhesive tape.
The utility model provides a waterstop back pressure leak protection method for immersed tube, it sets up the waterstop and forms once stagnant water structure between two immersed tube terminal surfaces, utilizes once stagnant water structure to carry out normal stagnant water between two immersed tube terminal surfaces, still is provided with the back pressure part on one of them immersed tube terminal surface, when unusual reason leads to the waterstop can not carry out normal stagnant water, controls the back pressure part and compresses tightly the waterstop and form secondary stagnant water structure, utilizes secondary stagnant water structure to carry out unusual stagnant water.
Furthermore, the water stop back pressure leakage-proof method for the immersed tube is characterized in that a standby pressure surface with pressure expansion elasticity is additionally arranged on the end surface of the water stop provided with the water stop part, the water stop is tightly fixed on the end surface of the first immersed tube at the joint part of the first immersed tube and the second immersed tube, and the water stop part is still attached and pressed on the end surface of the second immersed tube to enable the water stop part to have the water stop function under the normal condition; and meanwhile, the end surface of the second immersed tube is grooved, and a back pressure component corresponding to the standby pressure surface is arranged in the groove, so that the standby pressure surface of the water stop belt is close to the back pressure component, and when the water stop component fails and external water leaks into the immersed tube, the standby pressure surface is tightly pressed by the back pressure component to stop water.
Furthermore, the waterstop back pressure leakage-proof method for the immersed tube is characterized in that the waterstop part is symmetrically arranged on the waterstop edges of the two sides of the prepared pressure surface.
The invention has the advantages that:
1. once the waterstop leaks, permanent repair and water stop can be performed in time, and the operation is simple and convenient.
2. After the life cycle is reached, if the leakage-proof device is not started, the immersed tube tunnel can be safely used for a period of time on the premise that the quality of other key facilities still reaches the standard.
Drawings
FIG. 1 is a schematic cross-sectional view of a water stop back pressure leakage prevention system for a immersed tube installed at the joint of two immersed tubes;
FIG. 2 is a schematic cross-sectional view of a check belt;
FIG. 3 is a schematic cross-sectional view of a backpressure assembly;
FIG. 4 is a schematic plan view of the overall structure of the counter-pressure frame;
FIG. 5 is a schematic view of the seal assembly installation;
FIG. 6 is an enlarged partial cross-sectional view of the seal assembly;
FIG. 7 is a schematic view of the end face structure of the immersed tube equipped with the back pressure device;
FIG. 8 is a schematic sectional view taken along line A of FIG. 7;
FIG. 9 is an enlarged view of a portion of the first embodiment (with the first and second ends hidden for ease of illustration);
fig. 10 is a schematic view of a state that a back pressure edge in a back pressure device presses a backup pressure surface in a water stopping device to resist water and leak.
In the figure: 1. sinking a first pipe; 2. sinking a second pipe; 3. a water stop; 31. a base; 32. a compression expansion body; 33. preparing pressed noodles; 34. a water stopping edge; 35. a gasket; 36. mounting a plate; 4. a backpressure component; 41. back pressing the edges; 42. a slip surface; 43. a counter-pressure frame; 44. a propeller; 45. a counter-pressure tank; 441. an installation body; 442. screwing in the bolt; 443. bolt holes; 444. positioning the guide body; 445. a limit buckle; 446. buckling; 447. a bolt notch; 448. an installation position; 449. an operation hole; 5. a seal assembly; 51. sealing the adhesive tape; 52. a double layer slip film; 521. a first sliding film; 522. and a slip film two; 53. sealing and pressing the strips; 54. and (5) compacting the groove.
Detailed Description
The invention is further described with reference to the following examples and figures:
the system is applied to the joint part of two sections of immersed tubes of a submarine immersed tube tunnel, and ensures that the joint part can prevent water outside the immersed tube, hereinafter referred to as external water, from leaking into the immersed tube even if the joint part encounters a geological disaster with strong intensity in the whole life cycle.
As shown in fig. 1, for convenience of description and understanding of the present system, the two sections of immersed tubes are referred to as immersed tube one 1 and immersed tube two 2 respectively and are labeled respectively; the joint of the two sections of immersed tubes is the joint of the immersed tube I1 and the immersed tube II 2; the setting mode of the combination parts of all the immersed tubes and the immersed tubes in the immersed tube tunnel of the system is consistent with the setting mode of the combination parts of the immersed tube I1 and the immersed tube II 2.
Specifically set forth herein: the end face or end part of the first immersed tube 1 refers to the end face or end part of the first immersed tube 1 at the joint of the first immersed tube 1 and the second immersed tube 2, and the end face or end part of the second immersed tube 2 refers to the end face or end part of the second immersed tube 2 at the joint of the first immersed tube 1 and the second immersed tube 2; the water stopping device arranged on the end face of the first immersed tube 1 and the back pressure device arranged on the end face of the second immersed tube 2 can be interchangeably arranged, namely, the back pressure device is arranged on the end face of the first immersed tube 1, and the water stopping device is arranged on the end face of the second immersed tube 2.
A waterstop back pressure leakage-proof system for a immersed tube comprises a water stopping device and a back pressure device.
As shown in fig. 1, 2, and 10, the water stop device includes a water stop 3, and an end face of one end of the water stop 3 includes a pressure-preparing surface 33 and a water stop member; the other end of the water stop is the base part 31 of the water stop belt 3, and a pressure expansion main body 32 is arranged between the two ends of the water stop belt 3.
The water stopping device is also provided with a mounting plate 36 and a sealing gasket 35 which are tightly pressed, compressed and sealed and fixed on the end surface of the immersed tube I1, and the sealing gasket 35 is arranged between the mounting plate 36 and the end surface of the immersed tube I1.
The base 31 of the water stop 3 is fixed to the mounting plate 36 by pressing.
In this way, the water stop 3 is mounted on the end face of the immersed tube 1 in a leak-free and tight manner with the immersed tube 1.
And a water stop belt 3 is arranged on the end surface of the immersed tube I1 at the joint part of the immersed tube I1 and the immersed tube II 2, a water stop part of the water stop belt 3 is tightly pressed on the end surface of the immersed tube II 2, and the water stop belt 3 bears the water stop function at the joint part of the immersed tube I1 and the immersed tube II 2 through the water stop part under the condition of no overlarge catastrophe in the whole life cycle of the immersed tube tunnel.
As shown in fig. 3, the counter-pressure device has a counter-pressure member 4, the counter-pressure member 4 comprising a counter-pressure frame 43 having a counter-pressure edge 41 on one end face.
The counter pressure edge 41 has a streamlined sliding surface 42, the cross section of which is narrowed from the base to the top, and the top cross-sectional side line of which is curved.
As shown in fig. 4, the counter-pressure frame 43 is a one-piece frame having a structural shape corresponding to the structural shape of the cross-section of the second immersed tube 2, and the counter-pressure frame 43 has high strength and good corrosion resistance. The counter-pressure frame 43 is arranged in a counter-pressure groove 45 formed on the end face of the second immersed tube 2.
As shown in fig. 3, 7, 8, the backpressure assembly also includes a pusher 44; the pusher 44 includes a mounting body 441, a pushing screw 442, and a positioning guide body 444 having a bolt hole 443, the positioning guide body 444 is fixed to the mounting body 441, and one end of the pushing screw 442 contacts the reaction frame 43 through the bolt hole 443 of the positioning guide body 444.
The contact between the pushing screw 442 and the counter pressure frame 43 means that a limit buckle 445 is arranged at one end of the pushing screw 442 contacting the counter pressure frame 43, a buckle 446 is arranged at the end surface of the rear end of the counter pressure frame 43, and the limit buckle 445 is positioned in the buckle 446 and can rotate in the buckle 446.
The fastener 446 is a rectangular frame, the bottom frame surface of which is fixed on the end surface of the counter-pressure frame 43, and the upper frame surface of which is provided with a bolt notch 447 for the screw rod of the pushing screw bolt 442 to be radially placed in.
A plurality of mounting positions 448 for mounting the propeller 44 are arranged at certain intervals behind the back pressure groove 45 arranged on the end surface of the second immersed tube 2, and the propeller 44 is mounted in the mounting positions 448; an operation hole 449 leading to the propeller 44 at the position of the propelling screw 442 is also formed in the inner wall of the end of the sinking tube 2. The back pressure frame 43 can be pushed out or retracted in the back pressure groove 45 by screwing the push screw 442 through the operation hole 449.
As shown in fig. 5 and 6, the counter-pressure device further comprises a sealing assembly 5, wherein the sealing assembly 5 comprises a sealing tape 51 with high elasticity and corrosion resistance and a sealing strip 53. Two sides of the back pressure groove 45 on the end surface of the second immersed tube 2 are respectively provided with a pressure sealing groove 54, and two sides of the sealing adhesive tape 51 are tightly pressed in the pressure sealing grooves 54 arranged on the two sides of the back pressure groove 45 by the pressure sealing strips 53. This covers the entire counter-pressure assembly 4 with the sealing tape 51 and closes it in the end face of the second immersed tube 2.
The sealing assembly 5 further comprises a double-layer sliding film 52 stacked by a sliding film I521 and a sliding film II 522, wherein the double-layer sliding film 52 is covered on the outer surface of the sealing adhesive tape 51, and two side edges of the double-layer sliding film 52 are respectively stacked with two side edges of the double-layer sliding film 52 and pressed in the sealing groove 54 by the sealing strip 53. The double-layer sliding film 52 has high elasticity and stable physicochemical properties, and the sliding film I521 and the sliding film II 522 are not adhered and not penetrated, and can keep a mutual sliding state for a long time.
As shown in fig. 1, 2 and 10, the water stopping member in the water stopping strip is preferably designed as two water stopping edges 34 symmetrically arranged on both sides of the standby pressure surface 33, and the two water stopping edges 34 are respectively attached to the end surfaces of the immersed tube 2 on both sides of the sealing tape 51 to perform water stopping.
In the above arrangement, as shown in fig. 5 and 6, the double-layer slide film 52 and the seal tape 51 are positioned between the pressure-preparing surface 33 and the counter-pressure edge 41.
As shown in fig. 9, in a normal state, between the pressure preparation surface 33 and the double-layer slip film 52, between the double-layer slip film 52 and the sealing tape 51, and between the sealing tape 51 and the back pressure edge 41 are one of the following three cases: a. close to each other with a gap; b. the materials are jointed and are not pressed; c. fit together and lightly press.
As shown in fig. 8 and 10, when the joint between the first sinking pipe 1 and the second sinking pipe 2 leaks water into the sinking pipe due to geological catastrophe or after geological catastrophe, the engineer rotates the driving bolt 442 through the operation hole 449 to push the counter pressure frame 43 out of the counter pressure groove 45, so that the high elastic corrosion-resistant sealing tape 51 and the double-layer sliding film 52 protrude toward the pressure-prepared surface 33 and press the pressure-prepared surface 33 tightly until the water leaking into the sinking pipe from the outside of the sinking pipe is completely blocked, thereby realizing counter pressure leakage prevention and water stopping of the system.
The geological catastrophe causes the joint part of the immersed tube I1 and the immersed tube II 2 to leak outside water into the immersed tube, the reason is that the immersed tube I1 and the immersed tube II 2 are greatly staggered, so that the water stop part is deviated to stretch out not in place or the pressure applied to the end face of the immersed tube II 2 is insufficient, and during design, the dislocation of the immersed tube at the joint part caused by the sedimentation difference or the geological catastrophe of the bottom bed of the underwater tunnel is fully considered, and the situation can be caused only by very special reasons. In the actual design, the dislocation amount of dislocation of the immersed tube at the joint part caused by the sedimentation difference or geological catastrophe is only 10 mm-40 mm, and the width of the water stop is generally 250 mm-400 mm.
In the above arrangement, the technical effect of the technical measures is obvious.
As shown in fig. 10, the water stop member in the water stop band is designed as two water stop edges 34 symmetrically arranged at two sides of the standby pressure surface 33, one is that a wider standby pressure surface 33 is reserved between the two water stop edges 34, so that the back pressure member can still press against the standby pressure surface 33 when large offset dislocation occurs; secondly, two water stopping components can be used for stopping water, and one water stopping guarantee is provided compared with the prior art which adopts a single water stopping component; thirdly, when the immersed tube I1 and the immersed tube II 2 are pulled, the two water stopping edges 34 can better block the shaking of the end parts of the two immersed tubes, limit the shaking amplitude and the shaking frequency and improve the butt joint precision of the immersed tube I1 and the immersed tube II 2.
As shown in fig. 3, 6 and 10, the counter pressure rib 41 has a streamline sliding surface 42, so that the sealing tape 51 and the double-layer sliding film 52 are also in streamline shapes on the outer surface of the protruding part of the pre-pressure surface 33, so that relative sliding can be realized between the pre-pressure surface 33 and the sliding film one 521 and between the sliding film one 521 and the sliding film two 522, and the counter pipe dislocation caused by geological disasters can be solved again in the future. Similarly, the double-layer slide film 52 is provided to allow the backup surface 33 and the back pressure edge 41 to move relative to each other; if the double-layer sliding film 52 is not provided, the pressure-bearing surface 33 and the sealing tape 51 will be stuck together by penetrating into each other for a long period of time, and the sealing tape 51 or the like may be torn when displaced.
As shown in fig. 1 and 2, a method for preventing leakage of a water stop 3 for a immersed tube by back pressure, which is to arrange a water stop between two end faces of the immersed tube to form a primary water stop structure, and to normally stop water between the two end faces of the immersed tube by using the primary water stop structure, is characterized in that: and when the waterstop can not normally stop water due to abnormal reasons, the backpressure component is controlled to tightly press the waterstop to form a secondary water stopping structure, and abnormal water stopping is performed by using the secondary water stopping structure.
Furthermore, the back pressure leakage-proof method of the water stop belt 3 for the immersed tube is characterized in that a standby pressure surface 33 with pressure expansion elasticity is additionally arranged on the end surface of the water stop belt 3 provided with a water stop component, the water stop belt 3 is closely fixed on the end surface of the immersed tube I1 at the joint part of the immersed tube I1 and the immersed tube II 2, and the water stop component is still attached to the end surface of the immersed tube II 2 to ensure that the water stop component can play a water stop function under a normal condition; meanwhile, the end face of the second immersed tube 2 is provided with a groove, a back pressure part corresponding to the standby pressure surface 33 is arranged in the groove, the standby pressure surface 33 of the water stop belt 3 is close to the back pressure part, and when the water stop part fails and external water leaks into the immersed tube, the back pressure part presses the standby pressure surface 33 to stop water.
As shown in fig. 1, 3, 8, 10; furthermore, the method for back pressure and leakage prevention of the waterstop 3 for the immersed tube is to arrange the water stopping parts as the water stopping edges 34 symmetrically arranged at two sides of the standby pressure surface 33.
The above-described embodiments are intended to illustrate the invention more clearly and should not be construed as limiting the scope of the invention covered thereby, any modification of the equivalent should be considered as falling within the scope of the invention covered thereby.
Claims (8)
1. The utility model provides a waterstop back pressure leak protection system for immersed tube, includes sealing device, sealing device has waterstop (3), its characterized in that: the water stop device is arranged on the end face of the first immersed tube (1) and is in contact with the end face of the second immersed tube (2), the back pressure device is arranged on the end face of the second immersed tube (2), and the back pressure device can be tightly pressed on the water stop device (3); one end face of the water stop belt (3) is provided with a pressure preparation surface (33) and a water stop part, the back pressure device is provided with a back pressure assembly (4), and the back pressure assembly (4) comprises a back pressure frame (43) with a back pressure edge (41) on one end face; at the joint of the first immersed tube (1) and the second immersed tube (2) which are butted in front and back, the water stopping device is arranged on the end surface of the first immersed tube (1), the water stopping part of the water stopping device is attached to and pressed on the end surface of the second immersed tube (2), the back pressure device is arranged on the end surface of the second immersed tube (2), and the back pressure edge (41) on the back pressure frame (43) can be tightly pressed on the standby pressure surface (33) of the water stopping belt (3).
2. The waterstop back pressure leakage prevention system for the immersed tube according to claim 1, wherein: the back pressure edge (41) is provided with a streamline sliding surface (42), the section of the back pressure edge is narrowed from the base to the top, and the top interface side line of the back pressure edge is a curve.
3. The waterstop back pressure leakage prevention system for the immersed tube according to claim 1, wherein: the backpressure assembly further comprises a propeller (44), the propeller (44) comprises a mounting body (441), a push-screw bolt (442) and a positioning guide body (444) with a bolt hole (443), the positioning guide body (444) is fixed on the mounting body (441), and one end of the push-screw bolt (442) is in contact with the backpressure frame (43) through the bolt hole (443) of the positioning guide body (444).
4. The waterstop back-pressure leakage-proof system for the immersed tube according to claim 3, wherein: a limiting buckle (445) is arranged at one end of the pushing and screwing bolt (442) contacting with the counter-pressure frame (43), a buckle (446) is arranged at the end face of one end of the counter-pressure frame (43) contacting with the pushing and screwing bolt (442), and the limiting buckle (445) is positioned in the buckle (446) and can rotate in the buckle (446).
5. The waterstop back pressure leakage prevention system for the immersed tube according to any one of claims 1 to 4, wherein: the counter-pressure device also has a sealing assembly (5), wherein the sealing assembly (5) comprises a sealing adhesive tape (51) with high elasticity and corrosion resistance and a sealing strip (53); two sides of the sealing adhesive tape (51) are tightly pressed in a sealing groove (54) formed in the end face of the second immersed tube (2) by a sealing strip (53), and the whole back pressure assembly (4) is covered by the sealing adhesive tape (51) and is sealed in the end face of the second immersed tube (2).
6. The waterstop back-pressure leakage-proof system for the immersed tube according to claim 5, wherein: the sealing assembly (5) further comprises a double-layer sliding film (52) which is formed by stacking a sliding film I (521) and a sliding film II (522), wherein the double-layer sliding film (52) is attached to the outer surface of the sealing adhesive tape (51), and two side edges of the double-layer sliding film are respectively stacked with two side edges of the double-layer sliding film (52) and pressed in the pressure groove (54) by the pressure strip (53).
7. The waterstop back-pressure leakage-proof system for the immersed tube according to claim 6, wherein: the water stopping components are two water stopping edges (34) symmetrically arranged on two sides of the pressure surface (33), and the two water stopping edges (34) are respectively attached to the end surfaces of the second immersed tubes (2) on two sides of the sealing adhesive tape (51).
8. The utility model provides a stagnant water belt (3) back pressure leak protection method for immersed tube, it sets up the stagnant water belt and forms a stagnant water structure between two immersed tube terminal surfaces, utilizes a stagnant water structure carries out normal stagnant water between to two immersed tube terminal surfaces, its characterized in that: the end face of one of the immersed tubes is also provided with a back pressure part, when the waterstop can not carry out normal water stopping due to abnormal reasons, the back pressure part is controlled to press the waterstop tightly to form a secondary water stopping structure, and abnormal water stopping is carried out by utilizing the secondary water stopping structure; a standby pressure surface (33) with pressure expansion elasticity is additionally arranged on the end surface of the water stop belt (3) provided with a water stop component, the water stop belt (3) is tightly fixed on the end surface of the immersed tube I (1) at the joint part of the immersed tube I (1) and the immersed tube II (2), and the water stop component is still attached to the end surface of the immersed tube II (2) to ensure that the water stop component can play a water stop function under a normal condition; meanwhile, the end face of the second immersed tube (2) is grooved, a back pressure component corresponding to the standby pressure surface (33) is arranged in the groove, the standby pressure surface (33) of the water stop belt (3) is close to the back pressure component, and when the water stop component fails and external water leaks into the immersed tube, the back pressure component presses the standby pressure surface (33) to stop water.
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| CN201910904326.XA CN110593323B (en) | 2019-09-24 | 2019-09-24 | Water stop back pressure leakage-proof system for immersed tube and back pressure leakage-proof method |
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| CN201910904326.XA CN110593323B (en) | 2019-09-24 | 2019-09-24 | Water stop back pressure leakage-proof system for immersed tube and back pressure leakage-proof method |
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