Earth rock cofferdam structure for diversion building

Abstract

The utility model discloses an earth rock cofferdam structure for a diversion building, and relates to the technical field of cofferdam construction, the earth rock cofferdam structure comprises two cofferdam main bodies arranged on the upstream and downstream of a river channel, the cofferdam main bodies are transversely arranged in the river channel and fixedly connected with river banks on the two sides of the river channel, and diversion canals are formed in the river banks at the same ends of the two cofferdam main bodies; the diversion canal is communicated with the upstream and downstream of the river channel, and a diversion foundation wall is arranged on the side, close to the cofferdam bodies, of the diversion canal and fixedly connected with the ends, close to the diversion canal, of the two cofferdam bodies. The diversion canal is excavated on the river bank located at the same end of the two cofferdam bodies, the diversion canal guides water flow on the upstream of the river channel to the downstream of the river channel, the diversion canal is formed in the river bank to replace a tunnel, and it is avoided as much as possible that the tunnel is scoured for a long time, collapses and influences a construction site in the cofferdam.

Description

An earth-rock cofferdam structure for diversion structures Technical Field

[0001] This application relates to the field of cofferdam construction technology, and in particular to an earth-rock cofferdam structure for diversion structures. Background Technology

[0002] In water conservancy projects, such as the construction of dams and sluices, construction needs to be carried out in dry conditions. However, the presence of rivers and other bodies of water can hinder construction, so measures need to be taken to create dry construction conditions.

[0003] Currently, when carrying out construction in river areas, the water flow is usually intercepted by building earthen and rock cofferdams in the transverse direction of the river. The water in the earthen and rock cofferdams is then discharged, and the upstream and downstream water is diverted through tunnels excavated at the low water level on the riverbank to bypass the construction area, thereby ensuring the smooth progress of construction.

[0004] Regarding the aforementioned technologies, the inventors believe that tunnels are prone to collapse after being eroded by water flow for a long time, causing water to flow from the collapse point to the cofferdam, which affects construction. Summary of the Invention

[0005] The purpose of this application is to provide an earth-rock cofferdam structure for diversion structures to improve the problem that tunnels are prone to collapse after being scoured by water flow for a long time, causing water to flow from the collapse point to the cofferdam and affecting construction.

[0006] This application provides an earth-rock cofferdam structure for diversion structures, which adopts the following technical solution:

[0007] An earth-rock cofferdam structure for a diversion structure includes two main cofferdam bodies located upstream and downstream of a river channel. The main cofferdam bodies are transversely positioned in the river channel and fixedly connected to the riverbanks on both sides of the river channel. A water diversion channel is constructed on the riverbank at the same end of the two main cofferdam bodies, connecting the upstream and downstream of the river channel. A diversion wall is provided on the side of the water diversion channel near the main cofferdam body, and the diversion wall is fixedly connected to the end of the two main cofferdam bodies near the water diversion channel.

[0008] By adopting the above technical solution, an irrigation canal is excavated on the riverbank at the same end of the two cofferdams to divert water from the upstream to the downstream. A guide wall is installed on the riverbank near the cofferdam, and the guide wall is fixedly connected to the end of the two cofferdams near the irrigation canal, so that the height of the guide wall is level with the cofferdam, minimizing the impact on construction caused by the water level in the irrigation canal exceeding the riverbank and flowing into the construction site between the two cofferdams. By using an irrigation canal on the riverbank instead of a tunnel, the long-term erosion and collapse of the tunnel can be avoided, thus minimizing the impact on the construction site within the cofferdam.

[0009] Optionally, a fixed pile is inserted into the side wall of the water diversion channel near the main body of the cofferdam, and the fixed pile extends upward and is fixedly connected to the diversion base wall.

[0010] By adopting the above technical solution, fixed piles are inserted into the side wall of the water diversion channel near the main body of the cofferdam. The fixed piles extend upward and are embedded in the guide wall and fixedly connected to the guide wall. This strengthens the side wall of the water diversion channel near the two cofferdams, minimizing the possibility of the riverbank tilting and collapsing due to the scouring of the side wall near the main body of the cofferdam by the water flow in the water diversion channel.

[0011] Optionally, the inner wall of the water diversion channel is inclined towards the two riverbanks, and the two ends of the water diversion channel are provided with expansion outlets, which extend away from the water diversion channel.

[0012] By adopting the above technical solution, the inner wall of the water diversion channel is inclined towards the riverbanks on both sides to reduce the erosion of the inner wall of the water diversion channel and minimize the possibility of the riverbanks on both sides of the water diversion channel collapsing; and expansion outlets are opened at both ends of the water diversion channel to allow the water from the upstream of the river to flow through the water diversion channel quickly.

[0013] Optionally, a geomembrane is provided on the inner wall of the water diversion channel, and the geomembrane extends upward along the inner wall of the water diversion channel.

[0014] By adopting the above technical solution, a geomembrane is laid on the inner wall of the water diversion channel. The geomembrane is extended upward along the inner wall of the water diversion channel to prevent seepage on both sides of the riverbank and further reduce the erosion of the inner wall of the water diversion channel.

[0015] Optionally, the water-facing surfaces of the two main cofferdams are provided with scour protection slopes, which extend towards the water diversion channel and are fixedly connected to the outside of the expansion port.

[0016] By adopting the above technical solution, anti-scouring slopes are set on the water-facing side of the two main cofferdams. The anti-scouring slopes are built towards the water diversion channel and connected to the outside of the expansion port, which reduces the scouring of the water-facing side of the main cofferdam and minimizes the possibility of the main cofferdam losing stability and collapsing due to prolonged scouring of the water-facing side.

[0017] Optionally, a retaining wall is provided on the side of the diversion outlet near the erosion protection slope, and the retaining wall is attached to the side wall of the erosion protection slope.

[0018] By adopting the above technical solution, a retaining wall is extended and installed on the side of the expansion outlet close to the scour protection slope. The retaining wall fits into the side wall of the scour protection slope to protect the connection between the side wall of the expansion outlet and the scour protection slope, reducing the scouring in the gap between the side wall of the expansion outlet and the scour protection slope. This allows the water from the upstream of the river to flow to the expansion outlet through the scour protection slope and retaining wall, and then to flow to the downstream of the river through the diversion channel.

[0019] Optionally, the side of the diversion outlet furthest from the main body of the cofferdam is fixedly connected to the riverbank sidewall.

[0020] By adopting the above technical solution, the side of the expansion outlet away from the main body of the cofferdam is fixedly connected to the sidewall of the riverbank, so as to minimize the impact of the water flow in the river on the scouring between the expansion outlet and the riverbank.

[0021] Optionally, the guide wall is arranged in an arc shape on the side closest to the water diversion channel.

[0022] By adopting the above technical solution, the side of the guide wall closest to the water diversion channel is set in an arc shape, which reduces the scouring of the guide wall by the excessively fast water flow in the water diversion channel and increases the service life of the guide wall.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Excavate a water diversion channel on the riverbank at the same end of the two main cofferdams to divert water from the upstream to the downstream of the river. Set up a guide wall on the riverbank on the side of the water diversion channel closest to the main cofferdam. The guide wall is fixedly connected to the end of the two main cofferdams closest to the water diversion channel, so that the height of the guide wall is level with the main cofferdam, so as to minimize the impact on construction caused by the water level in the water diversion channel exceeding the riverbank and flowing into the construction site between the two main cofferdams.

[0025] 2. The inner wall of the water diversion channel is inclined towards the riverbanks on both sides to reduce the erosion of the inner wall of the water diversion channel and minimize the possibility of the riverbanks on both sides of the water diversion channel collapsing; and the diversion channel is opened at both ends to allow the water from the upstream of the river to flow through the water diversion channel quickly.

[0026] 3. Extend a retaining wall on the side of the expansion outlet close to the scour protection slope. The retaining wall fits into the side wall of the scour protection slope to protect the connection between the side wall of the expansion outlet and the scour protection slope, reducing the scouring in the gap between the side wall of the expansion outlet and the scour protection slope. This allows water from the upstream of the river to flow through the scour protection slope and retaining wall to the expansion outlet, and then to flow to the downstream of the river through the diversion channel. Attached Figure Description

[0027] Figure 1 is an overall schematic diagram of an earth-rock cofferdam structure used for diversion structures.

[0028] In the diagram, 1 is the main body of the cofferdam; 11 is the erosion protection slope; 2 is the river channel; 21 is the riverbank; 3 is the water diversion channel; 31 is the expansion outlet; 311 is the retaining wall; 32 is the geomembrane; 4 is the diversion foundation wall; and 5 is the fixing pile. Detailed Implementation

[0029] The present application will be further described in detail below with reference to Figure 1.

[0030] A cofferdam structure for diversion structures, as shown in Figure 1, includes cofferdam bodies 1 constructed upstream and downstream of a river channel 2. The cofferdam bodies 1 are located laterally in the river channel 2 and connected to the riverbanks 21 on both sides of the river channel 2. A seepage-proof core wall is constructed in the cofferdam bodies 1. A water diversion channel 3 is excavated on the riverbank 21 at the same end of the two cofferdam bodies 1 to divert water from the upstream of the river channel 2 to the downstream of the river channel 2. A flow-diverting base wall 4 is cast in concrete on the side of the water diversion channel 3 near the cofferdam bodies 1. The flow-diverting base wall 4 is fixedly connected to the end of the two cofferdam bodies 1 near the water diversion channel 3, so that the height of the flow-diverting base wall 4 is flush with that of the cofferdam bodies 1, so as to minimize the impact on construction caused by the water level of the water flowing through the water diversion channel 3 exceeding the riverbank 21 and flowing into the construction site between the two cofferdam bodies 1.

[0031] Referring to Figure 1, a fixed pile 5 is inserted into the side wall of the water diversion channel 3 near the main body 1 of the cofferdam. The fixed pile 5 extends upward and is embedded in the guide wall 4 and fixedly connected to the guide wall 4. This reinforces the side wall of the water diversion channel 3 near the position between the two cofferdams, minimizing the scouring of the riverbank 21 near the main body 1 by the water flow in the water diversion channel 3, which could cause the riverbank 21 to tilt and collapse. The guide wall 4 is set in an arc shape on the side near the water diversion channel 3 to reduce the scouring of the guide wall 4 by the excessively fast flow velocity of the water in the water diversion channel 3.

[0032] Referring to Figure 1, the inner wall of the water diversion channel 3 is inclined towards the two riverbanks 21 to reduce the scouring of the inner wall of the water diversion channel 3 and minimize the possibility of the riverbanks 21 collapsing. Expansion outlets 31 are opened at both ends of the water diversion channel 3 to allow the upstream water flow of the river channel 2 to pass quickly through the water diversion channel 3. Scour protection slopes 11 are constructed on the upstream side of the two cofferdam bodies 1. The scour protection slopes 11 are constructed by filling steel cages with crushed stones. The scour protection slopes 11 are constructed towards the water diversion channel 3 and connected to the outside of the expansion outlets 31 to reduce the scouring of the upstream side of the cofferdam body 1 and minimize the possibility of the cofferdam body 1 losing stability and collapsing due to prolonged scouring.

[0033] Referring to Figure 1, a geomembrane 32 is laid on the inner wall of the water diversion channel 3. A clay layer and gravel are laid on the geomembrane 32 to fix it. The geomembrane 32 is extended upward along the inner wall of the water diversion channel 3 and fixedly connected to the guide wall 4 with water-stop bolts to prevent seepage on both sides of the riverbank 21 of the water diversion channel 3, while further reducing the scouring of the inner wall of the water diversion channel 3. A retaining wall 311 is extended and poured on the side of the expansion port 31 near the anti-scouring slope 11, so that the water from the upstream of the river channel 2 flows to the expansion port 31 through the anti-scouring slope 11 and the retaining wall 311, and then flows to the downstream of the river channel 2 through the water diversion channel 3. The side of the expansion port 31 away from the main body of the cofferdam 1 is fixedly connected to the side wall of the riverbank 21 to minimize the impact of the water flow in the river channel 2 on the scouring between the expansion port 31 and the riverbank 21.

[0034] The implementation principle of this application embodiment is as follows:

[0035] During construction, cofferdam bodies 1 are constructed transversely along the upstream and downstream sides of river channel 2, connecting the cofferdam bodies 1 to the riverbanks 21 on both sides of river channel 2. A water diversion channel 3 is excavated on the riverbank 21 at the same end of the cofferdam bodies 1, connecting the upstream and downstream sides of river channel 2 and diverting the flow of water in river channel 2. Fixed piles 5 are inserted into the side wall of the water diversion channel 3 near the cofferdam bodies 1 to reinforce the side wall of the water diversion channel 3 near the position between the two cofferdams. A flow guide wall 4 connected to the fixed piles 5 is set on the side of the water diversion channel 3 near the cofferdam bodies 1. The height of the flow guide wall 4 is flush with that of the cofferdam bodies 1 to minimize the water level in the water diversion channel 3 from exceeding the riverbank 21 and flowing to the construction site between the two cofferdam bodies 1. By constructing a water diversion channel 3 on the riverbank 21 instead of a tunnel, the long-term erosion and collapse of the tunnel can be avoided as much as possible, thus preventing the construction site in the cofferdam from being affected.

[0036] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An earth-rock cofferdam structure for diversion structures, characterized in that: It includes two cofferdam bodies (1) set up upstream and downstream of the river channel (2). The cofferdam bodies (1) are located in the river channel (2) and are fixedly connected to the riverbanks (21) on both sides of the river channel (2). A water diversion channel (3) is opened on the riverbank (21) at the same end of the two cofferdam bodies (1). The water diversion channel (3) connects the upstream and downstream of the river channel (2). A flow guide wall (4) is set on the side of the water diversion channel (3) near the cofferdam body (1). The flow guide wall (4) is fixedly connected to the end of the two cofferdam bodies (1) near the water diversion channel (3).

2. The earth-rock cofferdam structure for a diversion structure according to claim 1, characterized in that: Fixed piles (5) are inserted into the side wall of the water diversion channel (3) near the main body of the cofferdam (1). The fixed piles (5) extend upward and are fixedly connected to the diversion base wall (4).

3. The earth-rock cofferdam structure for a diversion structure according to claim 2, characterized in that: The inner wall of the water diversion channel (3) is inclined toward the riverbanks (21) on both sides. The water diversion channel (3) is provided with a flow expansion port (31) at both ends. The flow expansion port (31) extends away from the water diversion channel (3).

4. The earth-rock cofferdam structure for a diversion structure according to claim 3, characterized in that: The inner wall of the water diversion channel (3) is provided with a geomembrane (32), which extends upward along the inner wall of the water diversion channel (3).

5. The earth-rock cofferdam structure for a diversion structure according to claim 4, characterized in that: The two main bodies of the cofferdam (1) are provided with anti-scour slope protection (11) on the water-facing side. The anti-scour slope protection (11) extends towards the water diversion channel (3) and is fixedly connected to the outside of the expansion port (31).

6. The earth-rock cofferdam structure for a diversion structure according to claim 5, characterized in that: The expansion port (31) is provided with a retaining wall (311) extending from the side of the scour protection slope (11), and the retaining wall (311) is attached to the side wall of the scour protection slope (11).

7. An earth-rock cofferdam structure for a diversion structure according to claim 6, characterized in that: The expansion port (31) is fixedly connected to the side wall of the riverbank (21) on the side away from the main body of the cofferdam (1).

8. The earth-rock cofferdam structure for a diversion structure according to claim 4, characterized in that: The guide wall (4) is arranged in an arc shape on the side near the water diversion channel (3).

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