Refill pipe expansion joint

Abstract

The utility model relates to the technical field of backfilling pipes in water conservancy and hydropower engineering, in particular to a backfilling pipe expansion joint, a corrugated pipe uniformly and freely deforms in an external steel pipe cavity, can completely absorb displacement in any direction, and is assisted by a sealing mechanism, so that the working state effect is excellent, and the phenomena of failure and water leakage are avoided. And long-term safe and reliable operation of the product can be ensured. The expansion joint is of a compound corrugated pipe structure and can completely absorb displacement in any direction. The integral external steel pipe is adopted, the corrugated pipe uniformly and freely deforms in a cavity of the external steel pipe, the phenomena of extreme deformation of a single corrugated pipe, jamming of a middle connecting pipe and the like are avoided, the excellent working state effect is guaranteed, and the failure water leakage phenomenon is avoided. Sealing mechanisms are adopted in the whole external steel pipe, the body and the corrugated pipe, and external soil and stones and internal silt are prevented from entering a telescopic joint cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of backfill pipes for water conservancy and hydropower engineering, in particular to a backfill pipe expansion joint. Background Art

[0002] The backfill pipe of water conservancy and hydropower project refers to the pressure steel pipe buried in the trench and backfilled with soil and rock. For the pipeline laid in the earthquake zone or passing through the active fault zone, necessary expansion joints should be installed along the line to absorb the deformation and displacement caused by temperature and geological reasons.

[0003] Existing technologies are generally divided into two categories: one can only compensate for axial displacement or a small amount of lateral displacement, which cannot fully meet the needs of the project; the other can compensate for displacement in all directions, but uses a solution in which the middle pipe is directly buried in the soil and the two end bellows are located on both sides of the middle pipe. Due to the resistance of soil and rocks, the single section of the bellows is deformed, and the middle pipe and the other end of the bellows are difficult to deform. During use, it is easy for a single bellows to be extremely deformed and the middle pipe to be stuck, which will cause the expansion joint to fail, resulting in a large amount of water medium leakage, endangering personal safety and causing catastrophic consequences. Existing products are increasingly unable to adapt to the development and safety needs of the industry. For this reason, a backfill pipe expansion joint is developed. Utility Model Content

[0004] The utility model aims to provide a backfill pipe expansion joint to solve the problem that the existing backfill pipe cannot absorb displacement in any direction and is deformed and damaged after being impacted by geological reasons of the fault zone.

[0005] The utility model provides a backfill pipe expansion joint, comprising a body, a first bellows, a second bellows, a first end pipe, a second end pipe, an intermediate pipe, an external steel pipe, a supporting mechanism and a sealing mechanism;

[0006] The first bellows is connected to the first end pipe and the middle pipe by welding, and the second bellows, the second end pipe and the middle pipe are connected by welding;

[0007] An external steel pipe is arranged outside the body, and the external steel pipe is connected to the body through a supporting mechanism and a sealing mechanism;

[0008] A sealing mechanism consisting of a polyurethane foam filling layer and a graphite packing sealing filling layer is arranged between the external steel pipe and the body, and inside the first bellows and the second bellows.

[0009] Furthermore, a polyurethane foam filling layer and a graphite packing sealing filling layer are arranged inside the first bellows and the second bellows to prevent internal mud and sand from entering.

[0010] Furthermore, the first bellows and the second bellows are located in the outer steel pipe cavity.

[0011] Furthermore, a polyurethane foam filling layer and a graphite packing sealing filling layer are arranged inside the metal structure.

[0012] The utility model has the following beneficial effects: The utility model provides a backfill pipe expansion joint, which adopts a bellows to deform evenly and freely in the cavity of an external steel pipe, can completely absorb displacement in any direction, and is supplemented by a sealing mechanism to ensure that the working state is excellent and no failure or leakage occurs, which can ensure the long-term safe and reliable operation of the product. The expansion joint is a compound bellows structure, which can completely absorb displacement in any direction. The integral external steel pipe is adopted, and the bellows deforms evenly and freely in the cavity of the external steel pipe, avoiding the extreme deformation of a single bellows and the obstruction of the intermediate pipe, ensuring that the working state is excellent and no failure or leakage occurs. The integral external steel pipe and the main body, as well as the bellows, adopt a sealing mechanism to prevent external soil and rocks and internal mud and sand from entering the expansion joint cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is a schematic diagram of the overall structure provided by the utility model.

[0015] Figure 2 This is a schematic diagram of the sealing mechanism in the overall structure provided by the utility model.

[0016] Illustrations: 1. First bellows, 2. Second bellows, 3. First end pipe, 4. Second end pipe, 5. Intermediate pipe, 6. External steel pipe, 7. Support mechanism, 8. Sealing mechanism, 9. Metal structural parts, 10. Polyurethane foam filling layer, 11. Graphite packing sealing filling layer. DETAILED DESCRIPTION

[0017] The utility model embodiment provides a backfill pipe expansion joint, such as Figure 1 as well as Figure 2 As shown, it includes a body, a first bellows 1, a second bellows 2, a first end pipe 3, a second end pipe 4, an intermediate pipe 5, an external steel pipe 6, a supporting mechanism 7 and a sealing mechanism 8;

[0018] The first bellows 1 is connected to the first end pipe 3 and the middle pipe 5 by welding, and the second bellows 2, the second end pipe 4 and the middle pipe 5 are connected by welding;

[0019] An external steel pipe 6 is provided outside the body, and the external steel pipe 6 is connected to the body through a supporting mechanism 7 and a sealing mechanism 8;

[0020] The telescopic joint in the utility model is composed of a first bellows 1, a second bellows 2, a first end pipe 3, a second end pipe 4, an intermediate pipe 5, an external steel pipe 6, a supporting mechanism 7 and a sealing mechanism 8. The first bellows 1, the second bellows 2 are connected with the first end pipe 3, the second end pipe 4 and the intermediate pipe 5 by welding, and the first bellows 1 and the second bellows 2 are used to absorb displacement in any direction.

[0021] A sealing mechanism 8 consisting of a polyurethane foam filling layer 10 and a graphite packing sealing filling layer 11 is provided between the external steel pipe 6 and the body, and inside the first bellows 1 and the second bellows 2 .

[0022] Specifically, in the utility model, a polyurethane foam filling layer 10 and a graphite packing sealing filling layer 11 are arranged inside the first bellows 1 and the second bellows 2 to prevent internal mud and sand from entering.

[0023] Specifically, the first bellows 1 and the second bellows 2 are located in the cavity of the external steel pipe 6 .

[0024] Specifically, the sealing mechanism 8 includes a metal structure 9 inside, wherein a polyurethane foam filling layer 10 and a graphite packing sealing filling layer 11 are arranged inside the metal structure 9;

[0025] The external steel pipe 6 is connected to the main body through a supporting mechanism 7 and a sealing mechanism 8 to ensure that the first bellows 1 and the second bellows 2 are deformed uniformly and freely in the cavity of the external steel pipe.

[0026] like Figure 1 As shown, the sealing mechanism 8 in the utility model is composed of a metal structure 9, a polyurethane foam filling layer 10, and a graphite packing sealing filling layer 11 to prevent external soil and rocks from entering. Figure 1 As shown, in the utility model, a polyurethane foam filling layer 10 and a graphite packing sealing filling layer 11 are arranged inside the first bellows 1 and the second bellows 2 to prevent the internal mud and sand from entering. The expansion joint adopts a compound bellows structure, and the combination of the first bellows 1 and the second bellows 2 at both ends absorbs axial, lateral and angular displacements. An external steel pipe 6 is arranged outside the body, and the first bellows 1 and the second bellows 2 deform evenly and freely in the cavity of the external steel pipe 6 to avoid damage caused by extreme deformation of a single bellows and obstruction of the intermediate pipe. A sealing mechanism 8 composed of a polyurethane foam filling layer 10 and a graphite packing sealing filling layer 11 is arranged between the external steel pipe 6 and the body, and inside the first bellows 1 and the second bellows 2.

[0027] The utility model uses a backfill pipe expansion joint as follows: the first corrugated pipe 1 and the second corrugated pipe 2 are uniformly and freely deformed in the external steel pipe cavity, and can completely absorb displacement in any direction, and are supplemented by a sealing mechanism 8 to ensure excellent working conditions and no failure or water leakage, meeting the requirements of long-term safe operation. The existing backfill pipe cannot absorb displacement in any direction, and the backfill pipe is deformed and damaged after being impacted by geological reasons of the fault zone.

[0028] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A backfill pipe expansion joint, characterized in that: It comprises a body, a first bellows (1), a second bellows (2), a first end pipe (3), a second end pipe (4), an intermediate pipe (5), an external steel pipe (6), a supporting mechanism (7) and a sealing mechanism (8); The first bellows (1) is connected to the first end pipe (3) and the middle pipe (5) by welding, and the second bellows (2), the second end pipe (4) and the middle pipe (5) are connected by welding; An external steel pipe (6) is arranged outside the body, and the external steel pipe (6) is connected to the body through a supporting mechanism (7) and a sealing mechanism (8); A sealing mechanism (8) consisting of a polyurethane foam filling layer (10) and a graphite packing sealing filling layer (11) is provided between the external steel pipe (6) and the body, and inside the first bellows (1) and the second bellows (2).

2. A backfill pipe expansion joint according to claim 1, characterized in that: A polyurethane foam filling layer (10) and a graphite packing sealing filling layer (11) are arranged inside the first bellows (1) and the second bellows (2).

3. The backfill pipe expansion joint according to claim 1, characterized in that: The first corrugated tube (1) and the second corrugated tube (2) are located in the cavity of the external steel tube (6).

4. The backfill pipe expansion joint according to claim 1, characterized in that: The sealing mechanism (8) comprises a metal structural member (9) inside, wherein a polyurethane foam filling layer (10) and a graphite packing sealing filling layer (11) are arranged inside the metal structural member (9).

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