Pipe jacking hole sealing structure

Abstract

The utility model relates to a pipe jacking hole sealing structure. The method is suitable for water conservancy and hydropower engineering. According to the technical scheme, the top pipe hole sealing structure is characterized by comprising a steel sleeve which is pre-buried in the inner wall of a rock hole, and a gap for injecting bentonite slurry is reserved between the steel sleeve and the outer wall of a top pipe; the water stop packing assembly comprises a first water stop packing and a second water stop packing, the first water stop packing is arranged between the outer wall of the jacking pipe and the inner wall of the steel sleeve, the first water stop packing is used for blocking bentonite slurry, and the second water stop packing is arranged on the outer wall, located outside the cavern, of the jacking pipe; the sealing assembly is arranged on the outer wall of the jacking pipe, connected with the steel sleeve and capable of fixing the second water stop packing, and the sealing assembly is matched with the outer wall of the jacking pipe to form a sealed cavity; and the water injection assembly is arranged on the sealing assembly and used for injecting water into the sealing cavity, so that the water injection pressure is the same as the pressure of the bentonite slurry, and a pressure water seal is formed between the first water stop packing and the second water stop packing.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy and hydropower engineering, in particular to a sealing structure for a top pipe opening. Background Art

[0002] At present, jacking construction is more common. Since the bentonite slurry filled between the outside of the jacking pipe and the rock wall needs to maintain a pressure of 0.1-0.2MPa, the sealing effect of most entrance structures is generally not ideal, and there is leakage of bentonite slurry, which reduces the lubrication effect of bentonite and increases the thrust of the jacking pipe, which not only affects the lubrication and drag reduction effect of the pipeline, but also brings certain risks to the pipeline construction. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to provide a sealing structure for a jacking pipe opening in view of the above-mentioned existing problems.

[0004] The technical solution adopted by the utility model is: a sealing structure for a top pipe opening, characterized in that it comprises:

[0005] The steel casing is pre-buried in the inner wall of the rock cave, and a gap is reserved between the steel casing and the outer wall of the top pipe for injecting bentonite slurry;

[0006] A water-stop packing assembly, comprising a first water-stop packing and a second water-stop packing, wherein the first water-stop packing is arranged between the outer wall of the top pipe and the inner wall of the steel casing, the first water-stop packing is used to seal the bentonite slurry, and the second water-stop packing is arranged on the outer wall of the top pipe outside the rock cave;

[0007] A sealing assembly, which is arranged on the outer wall of the top pipe and connected to the steel casing, can fix the second water-stop packing, and the sealing assembly cooperates with the outer wall of the top pipe to form a sealed chamber;

[0008] The water injection assembly is arranged on the sealing assembly and is used to inject water into the sealing chamber so that the injection pressure is the same as the bentonite slurry pressure, thereby forming a pressure water seal between the first water-stopping packing and the second water-stopping packing.

[0009] Through the above-mentioned technical means, the first water-stop packing is used to seal the bentonite slurry between the inner wall of the steel casing and the outer wall of the jacking pipe, the second water-stop packing is fixed to the outer wall of the jacking pipe outside the rock cave by using the sealing assembly, and a sealed chamber is formed between the sealing assembly and the jacking pipe. The sealed chamber is injected with water by using the water injection assembly, so that the water injection pressure in the sealed chamber is the same as the pressure of the bentonite slurry, thereby forming a pressure water seal between the first water-stop packing and the second water-stop packing, thereby ensuring that the bentonite slurry will not leak out during the jacking process of the jacking pipe.

[0010] In some embodiments, the sealing assembly includes a first fixing member, a second fixing member, and a third fixing member. The first fixing member is used to fix the second water-stopping packing, the second fixing member is used to cooperate with the outer wall of the top pipe to form the sealing chamber, and the third fixing member is used to fasten the first water-stopping packing.

[0011] In some embodiments, the first fixing member includes a first flange, a second flange and a first screw, the first flange and the second flange are respectively arranged on both sides of the second water-stop packing, the first screw passes through the first flange, the second water-stop packing and the second flange, and the two ends of the first screw are matched with nuts to fix the second water-stop packing.

[0012] In some embodiments, the second fixing member includes a third flange, a sealing steel plate and a second screw. The third flange is connected to the steel casing. The second flange and the third flange are connected via the sealing steel plate. The second screw passes through the first flange, the second water-stop packing, the second flange and the third flange. Both ends of the second screw are matched with the nuts to fix the sealing steel plate.

[0013] In some embodiments, the third fixing member includes a third screw, and the third screw is disposed between the second flange and the first water-stop packing. The third screw can compress the first water-stop packing.

[0014] In some embodiments, the water injection assembly includes a water injection pipe and a water injection valve. The water injection pipe is installed on the sealing assembly, and the water injection pipe is provided with the water injection valve.

[0015] In some embodiments, a retaining ring located between the first water-stopping packing and the bentonite slurry is welded to the inner wall of the steel casing, and a retaining ring is provided between the first water-stopping packing and the retaining ring.

[0016] The beneficial effects of the utility model are:

[0017] 1. The bentonite slurry is blocked by the first water-stop packing, and the second water-stop packing is fixed by the sealing component. The sealing component cooperates with the jacking pipe to form a sealed chamber between the first water-stop packing and the second water-stop packing. Water is injected into the sealed chamber through the water injection component so that the internal water injection pressure is the same as the bentonite slurry pressure, thereby forming a pressure water seal. The pressure water seal can dynamically balance the pressure difference between the external environment and the internal bentonite slurry, thereby effectively preventing the slurry from seeping out during the continuous jacking of the jacking pipe, thereby improving the stability of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of this application.

[0019] Figure 2 yes Figure 1 Schematic diagram of the structure enlarged in area A.

[0020] Description of reference numerals:

[0021] 1. First flange; 2. Second water-stop packing; 3. Second flange; 4. Water injection valve; 5. Water injection pipe; 6. Sealing steel plate; 7. Third flange; 8. Second screw; 9. Cave lining; 10. Steel casing; 11. Second nut; 12. Jacking pipe; 13. Third screw; 14. First water-stop packing; 15. Retaining ring; 16. Retaining ring; 17. Bentonite slurry; 18. First screw; 19. First nut.

[0022] This specification includes references to "one embodiment" or "an embodiment." The appearance of the phrase "in one embodiment" or "in an embodiment" does not necessarily refer to the same embodiment. The particular features, structures or characteristics may be combined in any suitable manner consistent with the present disclosure.

[0023] The term "comprising" is open ended. As used in the appended claims, the term does not exclude additional structures or steps.

[0024] "First," "second," etc. As used herein, these terms act as labels for the nouns that precede them and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.). DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the technical solution of the present utility model is further described below in conjunction with specific embodiments.

[0026] Combination Figure 1 and Figure 2 As shown, this embodiment is a sealing structure for a top pipe opening, including a steel casing 10, a water-stopping packing assembly, a sealing assembly and a water injection assembly. The sealing assembly includes a first fixing member, a second fixing member and a third fixing member. The water-stopping packing assembly includes a first water-stopping packing 14 and a second water-stopping packing 2. The inner wall of the cave lining 9 is pre-buried with a steel casing 10, and a gap for injecting bentonite slurry 17 is reserved between the steel casing 10 and the top pipe 12. The first water-stopping packing 14 is arranged between the outer wall of the top pipe 12 and the inner wall of the steel casing 10, and the first water-stopping packing 14 is used to block the bentonite slurry 17. The second water-stopping packing 2 is arranged on the outer wall of the top pipe 12 outside the cave, and the first fixing member is used to fix the second water-stopping packing 2. The second fixing member is used to cooperate with the outer wall of the top pipe 12 to form a sealed chamber, and the third fixing member is used to fasten the first water-stopping packing 14. The water injection assembly is arranged on the second fixing member, and is used to inject water into the sealing chamber, so as to form a pressure water seal between the first water-stopping packing 14 and the second water-stopping packing 2 .

[0027] In some embodiments, the first fixing member includes a first flange 1, a second flange 3 and a first screw 18. The first flange 1 and the second flange 3 are respectively arranged on both sides of the second water-stop packing 2. The first screw 18 passes through the first flange 1, the second water-stop packing 2 and the second flange 3. First nuts 19 are provided at both ends of the first screw 18. With the cooperation of the first screw 18, the first nut 19, the first flange 1 and the second flange 3, the second water-stop packing 2 can be fixed.

[0028] In some embodiments, the second fixing member includes a third flange 7, a sealing steel plate 6 and a second screw 8. The third flange 7 is connected to the end of the steel casing 10. The second flange 3 and the third flange 7 are connected via the sealing steel plate 6. The second screw 8 passes through the first flange 1, the second water-stop packing 2, the second flange 3 and the third flange 7. Second nuts 11 are provided at both ends of the second screw 8, so that the sealing steel plate 6 can be fixed.

[0029] In some embodiments, the third fixing member includes a third screw 13 . The third screw 13 is disposed between the second flange 3 and the first water-stop packing 14 . The first water-stop packing 14 can be compressed by the third screw 13 .

[0030] Furthermore, a retaining ring 16 located between the first water-stopping packing 14 and the bentonite slurry 17 is welded to the inner wall of the steel casing 10 , and a retaining ring 15 is provided between the first water-stopping packing 14 and the retaining ring 16 .

[0031] In some embodiments, the water injection assembly includes a water injection pipe 5 and a water injection valve 4. The sealing steel plate 6 is provided with a water injection pipe 5 connected to the sealed chamber, and the water injection valve 4 is installed on the portion of the water injection pipe 5 outside the sealed chamber. Water is injected into the sealed chamber through the water injection valve 4, and the water injection pressure in the sealed chamber is controlled to be the same as the pressure of the bentonite slurry 17, so that a pressure water seal is formed between the first water-stopping packing 14 and the second water-stopping packing 2.

[0032] This embodiment is a construction method of a pipe jacking hole sealing structure, including the following steps:

[0033] S1. During implementation, the sealing steel plate 6 is not welded first, and the first water-stopping packing 14 is compressed by the first flange 1, the second water-stopping packing 2, the second flange 3 and the third screw 13.

[0034] S2. When the compression of the first water-stop packing 14 meets the requirement, tighten the second nut 11 of the second screw rod 8.

[0035] S3. Then, the sealing steel plate 6 is welded to fix the entire device, so that the sealing steel plate 6, the second flange 3, the third flange 7 and the top pipe 12 together form a sealed cavity.

[0036] S4. During the advancement of the jacking pipe 12, water is injected into the sealed cavity through the water injection valve 4 so that the injection pressure is the same as the pressure of the bentonite slurry 17, thereby forming a pressure water seal between the two water-stop packings to ensure that the bentonite slurry 17 does not leak out during the advancement of the jacking pipe 12.

[0037] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A pipe jacking hole sealing structure, characterized in that: include: The steel casing (10) is pre-buried in the inner wall of the cave lining (9), and a gap is reserved between the steel casing (10) and the outer wall of the top pipe (12) for injecting bentonite slurry (17); A water-stop packing assembly, comprising a first water-stop packing (14) and a second water-stop packing (2), wherein the first water-stop packing (14) is arranged between the outer wall of the top pipe (12) and the inner wall of the steel casing (10), the first water-stop packing (14) is used to seal the bentonite slurry (17), and the second water-stop packing (2) is arranged on the outer wall of the top pipe (12) outside the rock cave; A sealing component, which is arranged on the outer wall of the top pipe (12) and connected to the steel casing (10), and is capable of fixing the second water-stop packing (2), and the sealing component cooperates with the outer wall of the top pipe (12) to form a sealed chamber; A water injection assembly is provided on the sealing assembly and is used to inject water into the sealing chamber so that the injection pressure is the same as the pressure of the bentonite slurry (17), thereby forming a pressure water seal between the first water-stopping packing (14) and the second water-stopping packing (2).

2. A pipe jacking hole sealing structure according to claim 1, characterized in that: The sealing assembly comprises a first fixing member, a second fixing member and a third fixing member, wherein the first fixing member is used to fix the second water-stopping packing (2), the second fixing member is used to cooperate with the outer wall of the top pipe (12) to form the sealing chamber, and the third fixing member is used to fasten the first water-stopping packing (14).

3. A pipe jacking hole sealing structure according to claim 2, characterized in that: The first fixing member comprises a first flange (1), a second flange (3) and a first screw (18); the first flange (1) and the second flange (3) are respectively arranged on both sides of the second water-stop packing (2); the first screw (18) passes through the first flange (1), the second water-stop packing (2) and the second flange (3); and the two ends of the first screw (18) are matched with a first nut (19) to fix the second water-stop packing (2).

4. A pipe jacking hole sealing structure according to claim 3, characterized in that: The second fixing part comprises a third flange (7), a sealing steel plate (6) and a second screw (8); the third flange (7) is connected to the steel casing (10); the second flange (3) and the third flange (7) are connected via the sealing steel plate (6); the second screw (8) passes through the first flange (1), the second water-stop packing (2), the second flange (3) and the third flange (7); the two ends of the second screw (8) are matched with the second nut (11) to fix the sealing steel plate (6).

5. The sealing structure for a jacking pipe opening according to claim 3, characterized in that: The third fixing member comprises a third screw (13), and the third screw (13) is arranged between the second flange (3) and the first water-stopping packing (14), and the third screw (13) can compress the first water-stopping packing (14).

6. A pipe jacking hole sealing structure according to claim 1, characterized in that: The water injection assembly comprises a water injection pipe (5) and a water injection valve (4); the water injection pipe (5) is installed on the sealing assembly, and the water injection pipe (5) is provided with the water injection valve (4).

7. The sealing structure for a jacking pipe opening according to claim 1, characterized in that: A retaining ring (16) located between the first water-stopping packing (14) and the bentonite slurry (17) is welded to the inner wall of the steel casing (10), and a retaining ring (15) is provided between the first water-stopping packing (14) and the retaining ring (16).

Images