Temporary handling structure after pipeline damage

Abstract

This utility model belongs to the field of hydropower engineering construction, specifically relating to a temporary treatment structure for pipeline damage. The utility model includes a retaining wall installed within the pipeline tunnel, with the pipeline fixedly placed inside. The retaining wall is located below the construction ground level. A water-retaining cofferdam is constructed on the retaining wall downstream of the pipeline damage point, and the cofferdam and retaining wall are integrated into a single structure. The upper end of the cofferdam is higher than the construction ground level, and the cofferdam extends radially to both sides along the pipeline. A seepage-proof layer is also provided on the downstream side of the cofferdam, enclosing the pipeline. A counterweight layer is also provided above the seepage-proof layer. This utility model uses a water-retaining cofferdam to block the water flowing out of the pipeline. Furthermore, the cofferdam is directly integrated with the retaining wall, resulting in a robust structure and reduced manufacturing costs. The counterweight layer behind the cofferdam enhances its water-retaining effect.

Description

Technical Field

[0001] This utility model belongs to the field of hydropower engineering structure, specifically relating to a temporary treatment structure for pipeline damage. Background Technology

[0002] In the design of existing hydropower station projects, the method for pre-burying pipelines is as follows: dig a pipeline pre-burying tunnel on the ground along the designed route, and then pour a support for placing the pipeline in the tunnel. Several support blocks form a section, and a retaining block is built in the area between two support blocks. The pipeline is protected and installed by the retaining block and the support block. The pipelines of existing hydropower stations are mostly high-pressure pipelines.

[0003] In existing hydropower station designs, various engineering methods and measures are used to reduce the possibility of pressure pipeline damage (such as designing support rings and expansion joints to increase the allowable displacement of pressure pipelines and reduce cracking at welded joints due to uneven foundation settlement; or by installing pressure pipeline protection devices to reduce the possibility of pressure pipeline damage; or by improving the materials of pressure pipelines to increase their strength, etc.). Therefore, it is assumed that pressure pipelines will not fail within the design service life of the hydropower station. However, during the operation of a hydropower station, the external and internal conditions of pressure pipelines are complex, and safety accidents caused by pressure pipeline damage still occur. For example, the Wenchuan earthquake caused pressure pipeline damage at the Caopo and Tongzhong hydropower stations, destroying the powerhouses; another example is the Oigawa hydropower station in Japan, where operational errors led to a violent water hammer wave in the pressure pipeline, causing it to rupture, flooding the powerhouse, damaging the generating units, and resulting in huge economic losses.

[0004] Currently, while various engineering methods and measures can reduce the possibility of pressure pipeline damage, they can only ensure the safe operation of pressure pipelines under normal conditions. They cannot guarantee that pressure pipelines will not be damaged due to adverse changes in external and internal conditions during the long operation period of a hydropower station. After a pressure pipeline is damaged, the high-pressure water flowing out of the pipeline lacks obstruction and emergency handling time, resulting in greater losses. Utility Model Content

[0005] This invention provides a robust temporary structure for handling pipe damage that can block water flow.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a temporary treatment structure for pipeline damage, including a retaining block set in the pipeline tunnel, a pipeline fixedly installed in the retaining block, the retaining block being set below the construction ground, and a water-retaining cofferdam being built on the retaining block located downstream of the pipeline damage point. The water-retaining cofferdam and the retaining block are built as an integral structure, the upper end of the water-retaining cofferdam is higher than the construction ground, the water-retaining cofferdam extends radially to both sides along the pipeline, and an anti-seepage layer is also provided on the downstream side of the water-retaining cofferdam. The anti-seepage layer wraps around the pipeline, and a counterweight layer is also provided on the water-retaining cofferdam above the anti-seepage layer.

[0007] To improve the impact resistance of the aforementioned water-retaining cofferdam, both ends of the cofferdam are arc-shaped, with the concave surface of the cofferdam located in the arc-shaped section facing upstream of the pipeline.

[0008] To solve the problem of water diversion, a water diversion ditch was dug on the construction ground to connect with the pipeline tunnel. The connection point between the water diversion ditch and the pipeline tunnel was located upstream of the water-retaining cofferdam. The water diversion ditch was located on both sides of the pipeline, and the water inlet of the water diversion ditch was located at the end where the water diversion ditch connected to the pipeline tunnel.

[0009] To improve the impact resistance of the water diversion ditch, the length of the ditch is arc-shaped, and the outlet end of the ditch extends towards the upstream of the pipeline relative to the inlet end of the ditch.

[0010] Furthermore, the water-retaining cofferdam is a concrete structure.

[0011] Furthermore, the impermeable layer material is clay.

[0012] Furthermore, the impermeable layer extends to both sides of the pier, and the top surface of the impermeable layer is level with the top surface of the pier.

[0013] Furthermore, the counterweight layer is a stacked stone structure.

[0014] The beneficial effects of this utility model are: the water flow in the pipeline is blocked by the water-retaining cofferdam; in addition, the water-retaining cofferdam is directly integrated with the pier, which is structurally robust and saves on manufacturing costs; a counterweight layer is also provided behind the water-retaining cofferdam to improve its water-retaining effect; at the same time, the water blocked by the water-retaining cofferdam is diverted out through the water diversion ditch, which not only plays a role in diverting the flow but also protects the safety of the water-retaining cofferdam and prevents the water flow from overflowing the water-retaining cofferdam and affecting its water-retaining effect. Attached Figure Description

[0015] Figure 1 This is a top view of the present invention;

[0016] Figure 2 yes Figure 1 Sectional view of AA;

[0017] Figure 3 yes Figure 1BB section view;

[0018] Figure 4 yes Figure 1 CC section view.

[0019] The markings in the diagram are: 1. Pipeline; 2. Pipeline pier; 3. Pipeline tunnel; 4. Water-retaining cofferdam; 5. Construction ground; 6. Seepage-proof layer; 7. Counterweight layer; 8. Water diversion ditch. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] In the description of this utility model, it should be noted that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for ease of understanding, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Combination Figures 1 to 3 As shown, this utility model includes a retaining block 2 installed in a pipeline tunnel 3, a pipeline 1 fixedly installed in the retaining block 2, the retaining block 2 is located below the construction ground 5, and a water-retaining cofferdam 4 is built on the retaining block 2 located downstream of the point of failure of the pipeline 1. The water-retaining cofferdam 4 and the retaining block 2 are built as an integral structure. The upper end of the water-retaining cofferdam 4 is higher than the construction ground 5. The water-retaining cofferdam 4 extends radially to both sides along the pipeline 1. A seepage-proof layer 6 is also provided on the downstream side of the water-retaining cofferdam 4. The seepage-proof layer 6 wraps around the pipeline 1. A counterweight layer 7 is also provided on the water-retaining cofferdam 4 above the seepage-proof layer 6.

[0023] This utility model uses a water-retaining cofferdam 4 to block the water flowing out of the pipe 1. The water-retaining cofferdam 4 is directly integrated with the pier 2, resulting in a robust structure and reduced manufacturing costs. A counterweight layer 7 is also provided on the downstream side of the water-retaining cofferdam 4 to improve its water-retaining effect. This utility model is mainly used to deal with the high-pressure water flow gushing out of the pipe 1 after it is damaged, providing valuable time for the evacuation of personnel from the factory and for the formulation and implementation of a disposal plan, thus preventing the factory from being flooded, damage to mechanical and electrical equipment, and casualties.

[0024] Among them, the anchor 2 is a fixed node used for load-bearing during the laying of pipeline 1. After the pipeline 1 is laid, pipeline 1 is located below the construction ground 5. The structure formed by combining the anchor pier 2 and the cofferdam 4 possesses a certain water-blocking capacity. On the one hand, the combination of anchor pier 2 and cofferdam 4 increases the overall amount of concrete used in anchor pier 2, thereby improving its safety. On the other hand, anchor pier 2 at the bottom of cofferdam 4 serves as its "foundation," significantly reducing the cost of excavation and backfilling concrete for the foundation of cofferdam 4. A seepage-proof layer 6 is provided on the downstream side of anchor pier 2. This layer prevents water from seeping out from the gap between the pipe 1 and anchor pier 2, achieving waterproofing and water-blocking effects below cofferdam 4. Furthermore, the seepage-proof layer 6 is filled on both sides of anchor pier 2 until it reaches the same height as anchor pier 2. While providing seepage prevention, it also significantly increases the water-blocking capacity of anchor pier 2. In addition, filling both sides of anchor pier 2 with the seepage-proof layer 6 provides support during the construction of cofferdam 4, improving stability, reducing construction damage, and lowering costs.

[0025] In addition, the counterweight layer 7 is located above the anti-seepage layer 6. Under the action of the anti-seepage layer 6, the weight of the counterweight layer 7 is evenly distributed, avoiding the counterweight layer 7 from causing squeezing damage to the pipeline 1. It is preferable to completely fill the backfill tunnel 3 on the downstream side of the pier 2 by combining the anti-seepage layer 6 and the counterweight layer 7.

[0026] like Figure 1 As shown, the two ends of the water-retaining cofferdam 4 are arc-shaped structures. The concave surface of the water-retaining cofferdam 4 located in the arc-shaped structure section faces the upstream of the pipe 1 (that is, the end position of the water-retaining cofferdam 4 extends towards the upstream of the pipe 1 relative to the middle position). When facing the impact of water flow, the arc-shaped structure can disperse the impact force into the foundation, thereby reducing the damage to the water-retaining cofferdam 4 caused by the impact of water flow. At the same time, when the water flows along the water-retaining cofferdam 4 to both sides, the flow velocity of the water flow can be reduced, thereby reducing the structural damage on both sides of the water flow pipe 1.

[0027] Combination Figure 1 , Figure 4 As shown, this utility model has a water diversion ditch 8 connected to the pipeline tunnel 3 on the construction ground 5. The connection point between the water diversion ditch 8 and the pipeline tunnel 3 is located upstream of the water-retaining cofferdam 4. The water diversion ditch 8 is located on both sides of the pipeline 1, and the inlet of the water diversion ditch 8 is located at the end where the water diversion ditch 8 connects to the pipeline tunnel 3. The water diversion ditch 8 diverts the water blocked by the water-retaining cofferdam 4, and while playing a diversion role, it directs the accumulated water to a gully or steep slope away from the safe area of ​​the factory building. The water diversion ditch 8 is connected to the backfill tunnel 3. After the pipeline 1 is damaged, the high-pressure water flow is faster and the water flow rate is larger. Multiple water diversion ditches 8 can be set on both sides of the pipeline 1 to increase the drainage capacity of the water diversion structure.

[0028] The water diversion ditch 8 includes side walls and a bottom plate. Two side walls are provided, fixed to the upper surface of the bottom plate. The upper surface of the water diversion ditch 8 is flush with the construction ground 5. The water diversion ditch 8 is connected to the pipeline tunnel 3, with the connection point serving as the inlet. To reduce project costs, only a certain length of the inlet of the water diversion ditch 8 can be hardened with sprayed concrete to improve its stability. The bottom plate of the water diversion ditch has a certain slope, ensuring that the outlet end is lower than the inlet end, thus facilitating smooth drainage.

[0029] like Figure 1 As shown, the length of the water diversion ditch 8 is arc-shaped, and the outlet end of the water diversion ditch 8 extends towards the upstream of the pipeline 1 relative to the inlet end of the water diversion ditch 8. The outlet of the water diversion ditch 8 extends upstream of the pipeline 1, and the outlet is moved further back away from the factory building, which can further reduce risks.

[0030] Furthermore, the water-retaining cofferdam 4 is preferably a concrete structure; concrete structure as a construction material has the following advantages: 1) it can be cast into various properties and sizes as needed, and is suitable for various structures; 2) it has good durability and fire resistance, and low maintenance costs; 3) it has high stiffness and high damping; 4) it has low cost.

[0031] Furthermore, the material of the impermeable layer 6 is preferably clay; clay as an impermeable material has the following advantages: 1) low permeability coefficient, good effect; 2) it is a flexible material, suitable for deformation, and easy to combine with other materials; 3) it is available locally, and the cost is low; 4) the construction process is simple and convenient.

[0032] Furthermore, the material used for the counterweight layer 7 is rubble. By stacking and combining the rubble, it can serve as a counterweight while reducing costs and construction difficulty.

[0033] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A temporary treatment structure for pipeline damage, comprising a retainer (2) installed in a pipeline tunnel (3), wherein a pipeline (1) is fixedly installed in the retainer (2), and the retainer (2) is located below the construction ground (5), characterized in that: A water-retaining cofferdam (4) is built on the pier (2) located downstream of the damage point of the pipeline (1). The water-retaining cofferdam (4) and the pier (2) are built as a single structure. The upper end of the water-retaining cofferdam (4) is higher than the construction ground (5). The water-retaining cofferdam (4) extends radially to both sides of the pipeline (1). A seepage-proof layer (6) is also provided on the downstream side of the water-retaining cofferdam (4). The seepage-proof layer (6) wraps the pipeline (1). A counterweight layer (7) is also provided above the seepage-proof layer (6) of the water-retaining cofferdam (4).

2. The temporary disposal structure for a pipe break according to claim 1, characterized in that: The two ends of the water-retaining cofferdam (4) are arc-shaped, and the concave surface of the water-retaining cofferdam (4) located in the arc-shaped section faces upstream of the pipeline (1).

3. The temporary disposal structure for a pipe break according to claim 1, characterized by: A water diversion ditch (8) connected to the pipeline tunnel (3) is opened on the construction ground (5). The connection point between the water diversion ditch (8) and the pipeline tunnel (3) is located upstream of the water-retaining cofferdam (4). The water diversion ditch (8) is located on both sides of the pipeline (1). The water inlet of the water diversion ditch (8) is located at the end where the water diversion ditch (8) is connected to the pipeline tunnel (3).

4. The temporary disposal structure for a pipe break according to claim 3, characterized in that: The length of the water diversion ditch (8) is arc-shaped, and the outlet end of the water diversion ditch (8) extends towards the upstream of the pipe (1) relative to the inlet end of the water diversion ditch (8).

5. The temporary disposal structure for a pipe break according to claim 1, characterized by: The water-retaining cofferdam (4) is a concrete structure.

6. The temporary disposal structure for a pipe break according to claim 1, characterized by: The seepage barrier (6) is made of clay.

7. The temporary disposal structure for a pipe break according to claim 1, characterized by: The impermeable layer (6) extends to both sides of the town mound (2), and the top surface of the impermeable layer (6) is level with the top surface of the town mound (2).

8. The temporary disposal structure for a pipe break according to claim 1, characterized by: The counterweight layer (7) is a stacked stone structure.

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