A cofferdam flow guiding structure suitable for narrow river channels

Abstract

The utility model discloses a cofferdam flow guide structure suitable for narrow river, including flow guide pipe, first cofferdam, its characterized in that still including setting in the support subassembly of first cofferdam downstream river, the support subassembly includes the even distribution of several horizontal supports along the river course, and the longitudinal support is fixed on several horizontal supports, several horizontal supports are obliquely arranged and the lower end is inserted in the river one side retaining wall, and the higher end is overlapped on the river other side retaining wall, one end of flow guide pipe communicates with first cofferdam, and the other end extends to the lower reaches of river and is set up on the lower side of several horizontal supports, and one side of flow guide pipe abuts against retaining wall, and the other side abuts against longitudinal support. The utility model solves the problem of existing flow guide pipe support's installation complex, dismounting difficult and flow guide pipe's unfirm fixation.

Description

Technical Field

[0001] This utility model belongs to the field of water conservancy engineering technology, specifically relating to a cofferdam diversion structure suitable for narrow river channels. Background Technology

[0002] During the renovation or maintenance of old river channels, it is usually necessary to dredge the silt at the bottom of the river and carry out concrete lining construction. Before construction, a guide pipe needs to be fixed with a support frame to guide the water flow around the construction area. In existing technology, wooden structures or welded steel frames are usually used as guide pipe supports, but the following problems exist: wooden structures are easily corroded by water flow, have poor durability, and insufficient load-bearing capacity; welded steel frames are time-consuming to install and are difficult to reuse after dismantling; the guide pipe is difficult to fix firmly and is prone to displacement due to water flow impact. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a cofferdam diversion structure suitable for narrow river channels, thereby solving the issues of complex installation, difficult disassembly, and unstable fixing of existing diversion pipe supports.

[0004] This utility model is achieved through the following technical solution.

[0005] A cofferdam diversion structure suitable for narrow rivers includes a diversion pipe and a first cofferdam. The structure is characterized by further including a support assembly disposed in the river channel downstream of the first cofferdam. The support assembly includes a plurality of transverse supports evenly distributed along the river channel direction, and a longitudinal support fixed to the plurality of transverse supports. The plurality of transverse supports are inclined, with their lower ends inserted into a retaining wall on one side of the river channel and their higher ends overlapping a retaining wall on the other side of the river channel. One end of the diversion pipe is connected to the first cofferdam, and the other end extends downstream of the river channel and is erected on the lower side of the plurality of transverse supports. One side of the diversion pipe abuts against a retaining wall, and the other side abuts against a longitudinal support.

[0006] Preferably, it also includes a second cofferdam set in the river channel downstream of the first cofferdam, and the first cofferdam, the second cofferdam and the retaining walls on both sides of the river channel enclose a seepage pool.

[0007] More preferably, the distance between the second cofferdam and the first cofferdam is 2-3 m.

[0008] More preferably, a water pump is installed in the seepage pool, and the outlet pipe of the water pump is connected to the upstream river channel of the first cofferdam.

[0009] Preferably, the support assembly further includes a plurality of cable ties that bind the guide tube to the longitudinal support.

[0010] Preferably, the erection height of the plurality of transverse supports decreases sequentially along the river channel.

[0011] More preferably, a space of at least 30cm is reserved between some of the horizontal supports and the bottom of the river channel.

[0012] Preferably, the spacing between the transverse supports along the river channel is 2-3 m.

[0013] More preferably, the transverse support and the longitudinal support are steel pipes, and the guide pipe is a plastic corrugated pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The diversion pipe is erected on the riverbed through the support components. The diversion pipe does not directly contact the bottom of the river channel, so it will not affect the dredging of the bottom of the river channel, the laying of gravel, and the construction of concrete lining. This ensures the continuity of construction and improves construction efficiency.

[0015] 2. Two cofferdams are used. If water seeps into the first cofferdam during construction, it can be pumped to the upstream of the cofferdam, which has a good water-blocking effect.

[0016] 3. By making reasonable use of the existing retaining wall structure in the river channel, the inclined transverse support and the retaining wall form an axle angle that can hold the guide pipe. The guide pipe is not easy to shift when it is installed in the axle angle. Moreover, since one side of the guide pipe is against the retaining wall, part of the impact force of the water flow in the guide pipe will be directly applied to the retaining wall and offset, thereby reducing the impact of continuous water flow on the support components. At the same time, the other side of the guide pipe is against the longitudinal support, which can further prevent the guide pipe from shifting laterally.

[0017] 4. The support components are easy to install and disassemble, and can be reused, which can reduce construction costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 for Figure 1 Sectional view at point AA; Figure 3 for Figure 1 Sectional view at point BB; The meanings of the labels in the above figure are as follows: First cofferdam 1, Second cofferdam 2, Diversion pipe 3, Support component 4, Horizontal support 401, Longitudinal support 402, Cable tie 403, River channel 5, Retaining wall 6, Seepage pool 7, Water pump 8, Silt 9. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the following embodiments are merely illustrative examples of the present invention, but the scope of protection of the present invention is not limited thereto. The described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0020] This embodiment provides a cofferdam diversion structure suitable for narrow river channels. Please refer to [link / reference]. Figures 1 to 3 The system includes a diversion pipe 3, a first cofferdam 1, and a support assembly 4 located in the downstream channel of the first cofferdam 1. The support assembly 4 includes several transverse supports 401 evenly distributed along the channel and longitudinal supports 402 fixed on the transverse supports 401. The transverse supports 401 are inclined and their lower ends are inserted into the retaining wall 6 on one side of the channel, while their higher ends overlap the retaining wall 6 on the other side of the channel. One end of the diversion pipe 3 is connected to the first cofferdam 1, and the other end extends downstream of the channel and is erected on the lower side of the transverse supports 401. The diversion pipe 3 abuts against the retaining wall 6 on one side and against the longitudinal support 402 on the other side. Based on the above structure, this utility model makes reasonable use of the existing retaining wall structure in the river channel, so that the inclined transverse support 401 and the retaining wall 6 form an axle angle that can hold the guide pipe. The guide pipe 3 is not easy to shift when it is installed in the axle angle. Moreover, since one side of the guide pipe 3 abuts against the retaining wall 6, part of the water flow impact force in the guide pipe will be directly applied to the retaining wall and offset, thereby reducing the impact of continuous water flow on the support components. At the same time, the other side of the guide pipe 3 abuts against the longitudinal support 402, which can further prevent the guide pipe from shifting laterally. In addition, when constructing the support components, it is only necessary to drill holes at appropriate locations on the retaining wall, insert the lower end of the appropriate length of the transverse support 401 into the retaining wall 6 on one side of the river channel, and overlap the higher end on the retaining wall 6 on the other side of the river channel. This allows for the quick installation of the transverse support 401. After that, the diversion pipe 3 can be lowered and erected on the transverse support 401. The diversion pipe 3 will automatically roll into the angle formed by the transverse support 401 and the retaining wall 6. Then, the longitudinal support 402 can be installed according to the position of the diversion pipe 3. The above construction process is simple and convenient, which can greatly improve construction efficiency. Furthermore, the diversion pipe 3, the transverse support 401, and the longitudinal support 402 can be disassembled and reused.

[0021] To ensure the water blocking effect and prevent the first cofferdam from seeping into the downstream construction area, in a preferred embodiment, the present invention further includes a second cofferdam 2 set in the river channel downstream of the first cofferdam 1. The first cofferdam 1, the second cofferdam 2, and the retaining walls 6 on both sides of the river channel enclose a seepage pool 7. Specifically, the distance between the second cofferdam 2 and the first cofferdam 1 is 2-3 m.

[0022] Furthermore, in a preferred embodiment, a water pump 8 is installed in the seepage pool 7, and the outlet pipe of the water pump 8 is connected to the upstream river channel of the first cofferdam 1. With this structure, during construction, seepage water from the first cofferdam accumulates in the seepage pool 7, and the water in the seepage pool 7 can be discharged upstream of the cofferdam by the water pump 8.

[0023] To ensure the guide tube 3 is securely fixed, in a preferred embodiment, the support assembly 4 further includes a plurality of cable ties 403, which bind the guide tube 3 to the longitudinal support 402; specifically, the cable ties 403 are iron wire or nylon straps.

[0024] Furthermore, in a preferred embodiment, the erection height of the plurality of transverse supports 401 decreases sequentially along the river channel. With this structure, the diversion pipes erected on the transverse supports 401 will have a certain slope to smoothly divert and discharge water upstream of the first cofferdam 1.

[0025] To facilitate dredging of the riverbed and concrete lining construction, in a preferred embodiment, at least 30cm of space is reserved between the transverse supports 401 and the riverbed, and the spacing between the transverse supports 401 along the riverbed is 2-3m.

[0026] Furthermore, in one specific implementation, the transverse support 401 and the longitudinal support 402 are steel pipes, and the guide pipe 3 is a plastic corrugated pipe. Example 2

[0027] Based on Example 1, this example provides a construction method for a cofferdam diversion structure suitable for narrow river channels, specifically including: S1. Drill holes at suitable locations in the retaining wall, with a drilling depth of 10-20cm; S2. Insert the lower end of the horizontal support 401 of appropriate length into the hole in the retaining wall 6 on one side of the river channel, while the higher end overlaps the retaining wall 6 on the other side of the river channel. S3. Lower the guide tube 3 and set it on the horizontal support 401, so that the guide tube 3 automatically rolls into the axle angle formed by the horizontal support 401 and the retaining wall 6. S4. Install the longitudinal support 402 according to the position of the guide pipe 3, so that one side of the guide pipe 3 abuts against the retaining wall 6 and the other side abuts against the longitudinal support 402; fix the longitudinal support 402 to the transverse support 401 with fasteners or wire; tie the guide pipe 3 to the longitudinal support 402 with cable ties 403. S5. Construct the first cofferdam 1 and the second cofferdam 2 at the designed location of the cofferdam, and install a water pump 8 in the seepage pool 7 formed by the first cofferdam 1, the second cofferdam 2 and the retaining walls 6 on both sides of the river. S6. Connect the upstream port of the diversion pipe 3 to the first cofferdam 1. Example 3

[0028] The cofferdam diversion structure in Example 1 has been used in the Luoping County Drainage and Flood Control Function Improvement Project (Phase II) River Regulation Project. Practice has proven that the installation and dismantling time of this cofferdam diversion structure is 40% shorter than that of the traditional method. During the diversion process, the diversion pipe did not deviate significantly, and the stability of the support met the requirements.

Claims

1. A cofferdam diversion structure suitable for narrow river channels, comprising a diversion pipe and a first cofferdam, characterized in that, It also includes a support assembly installed in the river channel downstream of the first cofferdam; the support assembly includes several transverse supports evenly distributed along the river channel, and longitudinal supports fixed on the transverse supports; the transverse supports are inclined and their lower ends are inserted into the retaining wall on one side of the river channel, and their higher ends are attached to the retaining wall on the other side of the river channel; one end of the diversion pipe is connected to the first cofferdam, and the other end extends downstream of the river channel and is erected on the lower side of the transverse supports, with one side of the diversion pipe abutting against the retaining wall and the other side abutting against the longitudinal support.

2. The cofferdam diversion structure suitable for narrow river channels as described in claim 1, characterized in that, It also includes a second cofferdam set up in the river channel downstream of the first cofferdam. The first cofferdam, the second cofferdam and the retaining walls on both sides of the river channel form a seepage pool.

3. A cofferdam diversion structure suitable for narrow river channels as described in claim 2, characterized in that, The distance between the second cofferdam and the first cofferdam is 2-3 m.

4. A cofferdam diversion structure suitable for narrow river channels as described in claim 2, characterized in that, A water pump is installed in the seepage pool, and the outlet pipe of the water pump is connected to the upstream river channel of the first cofferdam.

5. A cofferdam diversion structure suitable for narrow river channels as described in claim 1, characterized in that, The support assembly also includes a plurality of cable ties that bind the guide tube to the longitudinal support.

6. A cofferdam diversion structure suitable for narrow river channels as described in claim 1, characterized in that, The height of the various transverse supports decreases sequentially along the river channel.

7. A cofferdam diversion structure suitable for narrow river channels as described in claim 6, characterized in that, A space of at least 30 cm is reserved between some of the horizontal supports and the bottom of the river channel.

8. A cofferdam diversion structure suitable for narrow river channels as described in claim 1, characterized in that, The spacing between the horizontal supports along the river channel is 2-3 m.

9. A cofferdam diversion structure suitable for narrow river channels as described in any one of claims 1-8, characterized in that, The horizontal and vertical supports are made of steel pipes, and the guide pipe is made of plastic corrugated pipe.

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