River-side water diversion canal construction method and river-side water diversion canal structure

Abstract

This application relates to the technical field of construction of diversion channels, and provides a construction method for a riverside diversion channel and a diversion channel structure. The method includes: constructing a suction pool and a sand drainage pool on one side of the river; successively constructing two rows of first permanent sheet piles and two rows of second permanent sheet piles; the two rows of first permanent sheet piles are located between the suction pool and the sand drainage pool; the two rows of second permanent sheet piles are separated from each other at the edge of the river to form a flared end of the diversion channel; constructing two rows of temporary steel sheet piles located at the edge of the river for closing the flared end; constructing third permanent sheet piles on the opposite sides of the two rows of second permanent sheet piles and connecting the two; excavating the soil body, and constructing the bottom plate of the diversion channel, the support rods of the diversion channel and the diversion channel bridge; pulling out the temporary steel sheet piles and dredging the riverbed. The present invention overcomes the problems of poor geological conditions in the riverside area, difficult construction of the diversion channel and low construction efficiency. The construction efficiency is improved and the construction period is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of diversion canal construction, and particularly relates to a construction method for a riverside diversion canal and a riverside diversion canal structure. Background Art

[0002] At present, for some factory building projects, it is necessary to construct the inlet of the diversion canal and part or all of the main structure of the diversion canal on the riverside (or the edge of the river course), and use the diversion canal to introduce river water resources to reduce production costs. Such factory building projects are usually located in remote areas, and there are few available large mechanical resources around the factory buildings. In addition, the soil in the river area is wet and soft, and the geological conditions are poor, and there is a risk of overturning of large machinery. The conventional construction method is to first build a temporary cofferdam to separate the construction site from the river water, and then construct the diversion canal. After the diversion canal is constructed, the temporary cofferdam is removed. For example, Chinese Patent No. CN102900058B discloses a construction method for diversion of a wide riverbed dam-type hydropower station, in which a temporary cofferdam is constructed around the key projects of the project (such as some units of the factory building), the temporary cofferdam is U-shaped, and the open end of the temporary cofferdam is connected to the river bank on that side. After the temporary cofferdam is constructed, the foundation pit surrounded by the U-shaped temporary cofferdam and the river bank is pumped and drained to form a dry construction environment, and then part of the factory building is constructed; finally, the temporary cofferdam is removed. Obviously, this construction method of first building a temporary cofferdam and then building the target building on the river bank after the foundation pit treatment has the problems of long construction period and low construction efficiency. Therefore, a practical riverside diversion canal construction method that requires few mechanical resources, is fast in construction, and has high safety is needed. Summary of the Invention

[0003] In view of the above problems in the prior art, the present application proposes a construction method for a riverside diversion canal and a riverside diversion canal structure to overcome the construction difficulties and low construction efficiency caused by poor geological conditions when building a diversion canal on the riverside.

[0004] In a first aspect, a construction method for a riverside diversion canal proposed by the invention includes the following steps:

[0005] Construct a suction pool and a sand discharge pool on one side of the river course; construct two rows of first permanent sheet piles with a spacing between them between the suction pool and the sand discharge pool to respectively serve as the two side walls of the downstream section of the diversion canal; construct two rows of second permanent sheet piles with a spacing between them upstream of the sand discharge pool to respectively serve as the two side walls of the upstream section of the diversion canal; the two rows of second permanent sheet piles are separated from each other at the edge of the river course to form the flared end of the diversion canal; construct two rows of temporary steel sheet piles at the edge of the river course for closing the flared end; construct third permanent sheet piles on the opposite sides of the two rows of second permanent sheet piles, and install cables to connect the second permanent sheet piles and the third permanent sheet piles; excavate the soil inside the diversion canal and construct the bottom slab of the diversion canal; pull out the temporary steel sheet piles and dredge the river bed.

[0006] Furthermore, the steps of constructing two rows of temporary steel sheet piles at the river channel edge for closing the flared end include: constructing the first row of temporary steel sheet piles for closing the flared end along the river channel edge; arranging the second row of temporary steel sheet piles at a spacing on the side of the first row of temporary steel sheet piles facing away from the river channel in parallel; retaining the soil between the first row of temporary steel sheet piles and the second row of temporary steel sheet piles; and installing tie connectors to connect the first row of temporary steel sheet piles and the second row of temporary steel sheet piles.

[0007] Furthermore, the steps of excavating the soil inside the diversion canal and constructing the diversion canal bottom slab include:

[0008] excavating the soil between two rows of first permanent sheet piles, constructing the diversion canal bottom slab of the downstream section of the diversion canal, and constructing the diversion canal support rods; constructing the diversion canal bridge across the upstream section of the diversion canal; excavating the soil under the diversion canal bridge and conducting structural bearing capacity calculations; excavating the inner soil of the upstream section of the diversion canal and synchronously excavating the outer soil to balance the earth pressure; and constructing the diversion canal bottom slab of the upstream section of the diversion canal.

[0009] Furthermore, before excavating the soil between two rows of first permanent sheet piles, the steps also include: pouring construction concrete top beams at the tops of the first permanent sheet piles, the second permanent sheet piles, and the third permanent sheet piles respectively.

[0010] Furthermore, the steps of constructing the diversion canal support rods include: arranging a plurality of diversion canal support rods at intervals along the length direction of the downstream section of the diversion canal, and connecting the two ends of each diversion canal support rod to the concrete top beams at the tops of two rows of first permanent sheet piles respectively.

[0011] Furthermore, the steps of excavating the soil between two rows of first permanent sheet piles and constructing the diversion canal bottom slab of the downstream section of the diversion canal include: layer-by-layer excavating the soil between two rows of first permanent sheet piles to construct an open channel of the diversion canal; paving gravel on the bottom of the open channel to form a gravel layer; and pouring plain concrete on the gravel layer to form the diversion canal bottom slab.

[0012] Furthermore, the first permanent sheet piles, the second permanent sheet piles, and the third permanent sheet piles are precast concrete components.

[0013] Furthermore, before pulling out the temporary steel sheet piles and dredging the riverbed, laying gabion mattresses along the edge of the river channel is also included.

[0014] Furthermore, the steps of laying gabion mattresses along the edge of the river channel include: placing empty gabion nets along the edge of the river channel on the side of the second permanent sheet piles facing away from the third permanent sheet piles; connecting adjacent gabion nets; and filling each gabion net with fillers.

[0015] Furthermore, using a ground deformation monitoring system to monitor the ground deformation amount is also included.

[0016] Further, during the entire construction process of the water diversion channel, control the construction load away from the temporary steel sheet piles.

[0017] In a second aspect, the present invention also provides a riverside water diversion channel structure constructed by the above method, including: a suction pool arranged on one side of the river; two rows of first permanent sheet piles with a spacing therebetween, arranged upstream of the suction pool and serving as two side walls of the downstream section of the water diversion channel; a sand drainage pool arranged upstream of the two rows of first permanent sheet piles; two rows of second permanent sheet piles with a spacing therebetween, arranged upstream of the sand drainage pool and serving as two side walls of the upstream section of the water diversion channel; the two rows of second permanent sheet piles respectively extend from the sand drainage pool to the edge of the river, and are spaced apart from each other at the edge of the river to form the flared end of the water diversion channel; two rows of temporary steel sheet piles arranged at the river edge for temporarily closing the flared end; a third permanent sheet pile connected to the opposite sides of the two rows of second permanent sheet piles by cables; a water diversion channel bottom plate arranged between the two rows of first permanent sheet piles in the upstream section of the water diversion channel and between the two rows of second permanent sheet piles in the downstream section; a water diversion channel support rod arranged in the downstream section of the water diversion channel to support the two rows of first permanent sheet piles; and a water diversion channel bridge spanning across the upstream section of the water diversion channel and connecting the two rows of second permanent sheet piles.

[0018] The beneficial effects of the present invention are as follows: By constructing the first permanent sheet piles and the second permanent sheet piles as the side walls of the water diversion channel before excavating the soil mass, compared with the traditional method of first excavating and then constructing the side walls of the water diversion channel, the construction efficiency is improved; by constructing the temporary steel sheet piles for closing the flared end of the water diversion channel at the river edge, it effectively prevents river water backflow and blocks the infiltration of river water. Compared with the traditional method of constructing a U-shaped temporary cofferdam, the construction efficiency is higher, and the river water flow is not cut off, and it is less affected by the river water impact force, and it plays a protective role on the river bank to avoid the collapse of the river bank during the construction process; in cooperation with the solidifying effect of the first permanent sheet piles, the second permanent sheet piles, and the third permanent sheet piles on the river bank soil mass, it avoids the settlement or overturning of construction machinery and equipment, and improves the construction safety. By constructing the third permanent sheet piles connected by cables on the outside of the second permanent sheet piles, the reinforcement of the soil mass at the river edge is realized, the bearing capacity is improved, and the second permanent sheet piles serving as the side walls of the water diversion channel are prevented from toppling, further improving the construction safety. Compared with the prior art, the construction method of the present invention overcomes the problems of poor geological conditions in the river area, difficult construction of the water diversion channel, and low construction efficiency. It improves the construction efficiency and shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic flow chart of the riverside water diversion channel construction method of the present invention.

[0020] Figure 2It is a top - view schematic diagram of the construction of the suction pool of the water diversion canal structure and a row of first permanent sheet piles upstream thereof completed by the construction method of the present invention.

[0021] Figure 3 For Figure 2 it is a top - view schematic diagram of the construction of the sand - discharging pool of the water diversion canal structure and the second permanent sheet piles upstream thereof completed.

[0022] Figure 4 For Figure 3 it is a top - view schematic diagram of the construction of temporary steel sheet piles of the water diversion canal structure completed.

[0023] Figure 5 For Figure 4 it is a top - view schematic diagram of the construction of the third permanent sheet piles, the water diversion canal floor slab of the downstream section, and the water diversion canal support rods of the water diversion canal structure of

[0024] Figure 6 For Figure 5 it is a vertical sectional structure schematic diagram of the downstream section of the water diversion canal in

[0025] Figure 7 For Figure 5 it is a top - view schematic diagram of the completion of the construction of the water diversion canal bridge in the upstream section of the water diversion canal structure of

[0026] Figure 8 For Figure 7 it is a top - view schematic diagram of the completion of the construction of the bridge road stone foundation of the water diversion canal structure of

[0027] Figure 9 It is a top - view structural schematic diagram of the river - side water diversion canal structure of the present invention after the completion of the construction of the gabion mattress and the dredging of the river bed.

[0028] In the figure: 1 - suction pool; 2 - sand - discharging pool; 3 - water diversion canal; 31 - water diversion canal floor slab; 32 - water diversion canal support rod; 33 - first permanent sheet pile; 34 - second permanent sheet pile; 341 - flared end; 4 - third permanent sheet pile; 5 - concrete top beam; 6 - cable; 7 - water diversion canal bridge; 71 - bridge pedestrian path; 72 - bridge road stone foundation; 8 - gabion mattress; 9 - garbage shielding net; 10 - river course; 11 - temporary steel sheet pile. Specific embodiments

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] As Figure 1 shown in the river - side water diversion canal construction method, it includes the following steps:

[0031] S1. According to the construction drawings of the water diversion channel structure, construct the suction pool 1 and the sand drainage pool 2 on one side of the river. A distance is reserved between the suction pool 1 and the sand drainage pool 2 for the construction of the downstream section of the water diversion channel 3. The sand drainage pool 2 is located on the side of the suction pool 1 close to the river. The sand drainage pool 2 also keeps a spacing from the river.

[0032] The construction of the suction pool 1 includes soil excavation, side support, and concrete pouring, etc.

[0033] The construction of the sand drainage pool 2 includes soil excavation, side support, concrete pouring, etc.

[0034] S2. Construct two rows of spaced first permanent sheet piles 33 upstream of the suction pool 1 to serve as the two side walls of the downstream section of the water diversion channel 3 respectively. The two rows of spaced first permanent sheet piles 33 are located between the suction pool 1 and the sand drainage pool 2.

[0035] As Figure 2 shown, after the construction of the suction pool 1 is completed, in the upstream direction of the suction pool 1, for example Figure 2 shown, first construct a row of first permanent sheet piles 33 on the left side of the suction pool 1, and then construct another row of first permanent sheet piles 33 on the right side of the suction pool 1. Each row of first permanent sheet piles 33 is constructed from the suction pool 1 towards the river direction. The spacing and length of the two rows of first permanent sheet piles 33 are determined according to the construction drawings. After the soil in the area between the two rows of first permanent sheet piles 33 is excavated, it serves as the open channel of the downstream section of the water diversion channel 3. In other words, the two rows of first permanent sheet piles 33 are the two side walls of the downstream section of the water diversion channel 3. After the installation of the first permanent sheet piles 33 is completed using a pile driver, according to the elevation requirements, cut off the excess parts of the first permanent sheet piles 33 to make the top of the first permanent sheet piles 33 reach the predetermined height. At this time, the soil excavation construction between the two rows of first permanent sheet piles 33 is not carried out yet.

[0036] The sand drainage pool 2 is located upstream of the downstream section of the water diversion channel 3, while the previously constructed suction pool 1 is located downstream of the downstream section of the water diversion channel 3. After the soil in the space enclosed by the suction pool 1, the sand drainage pool 2, and the two rows of first permanent sheet piles 33 between them is excavated, it forms the water diversion channel of the downstream section of the water diversion channel 3.

[0037] Since the depth of the sand drainage pool 2 is relatively deep, steel sheet piles can be used to form a cofferdam around the sand drainage pool 2, and then the construction of the sand drainage pool 2 can be carried out.

[0038] S3. Construct two rows of spaced second permanent sheet piles 34 upstream of the sand drainage pool 2 to serve as the two side walls of the upstream section of the water diversion channel 3 respectively; the two rows of second permanent sheet piles 34 extend from the sand drainage pool 2 to the edge of the river respectively, and are far away from each other at the edge of the river to form the flared end 341 of the water diversion channel 3. As Figure 3As shown, the width of the upstream section of the water diversion channel 3 is wider than that of the downstream section of the water diversion channel 3. That is, the spacing between the two rows of second permanent sheet piles 34 is greater than the spacing between the two rows of first permanent sheet piles 33. The two rows of second permanent sheet piles 34 bend outward toward the outside of the water diversion channel 3 at one end away from the sand drainage pool 2, forming an expanded flared end 341 with an arc surface. The flared end 341 is located at the edge of the river channel and serves as the water inlet end for the connection between the water diversion channel 3 and the river channel. The water in the river channel flows into the water diversion channel 3 through the flared end 341. It should be noted that the outside of the water diversion channel 3 in the specification refers to the opposite sides of the two rows of first permanent sheet piles 33 and the opposite sides of the two rows of second permanent sheet piles 34, and the inside of the water diversion channel 3 refers to the facing sides of the two rows of first permanent sheet piles 33 and the facing sides of the two rows of second permanent sheet piles 34.

[0039] S4. Lay steel plates along the river channel as a temporary road, and construct two rows of temporary sheet piles 11 at the edge of the river channel for closing the flared end 341. After constructing the two rows of temporary sheet piles 11 at the flared end 341, as Figure 4 shown.

[0040] First, lay steel plates along the river channel as a temporary road and also as a temporary construction platform. Use a pile driver to drive the first row of temporary sheet piles 11 into the soil body in sequence along the edge of the river channel. The head and tail ends of the first row of temporary sheet piles 11 are respectively connected to the two ends of the second permanent sheet piles 34 close to the edge of the river channel. Thus, under the action of the first row of temporary sheet piles 11, the flared end 341 is closed. The adjacent temporary sheet piles 11 in the first row of temporary sheet piles 11 can be connected and strengthened by transverse connecting rods.

[0041] Parallel to the first row of temporary sheet piles 11, set the second row of temporary sheet piles 11 at a certain distance on the side opposite to the river channel; at the same time, retain the soil body between the first row of temporary sheet piles 11 and the second row of temporary sheet piles 11. The adjacent temporary sheet piles 11 in the second row of temporary sheet piles 11 can also be connected and reinforced by transverse connecting rods.

[0042] Install tie connectors to connect the first row of temporary sheet piles 11 and the second row of temporary sheet piles 11. The tie connectors are located between the first row of temporary sheet piles 11 and the second row of temporary sheet piles 11, and multiple tie connectors are arranged at intervals along the length direction of the river channel.

[0043] The space formed by enclosing the second row of temporary sheet piles 11, the sand drainage pool 2, and the two rows of second permanent sheet piles 34 constitutes the water diversion channel of the upstream section of the water diversion channel 3 after the soil body is excavated. Before the soil body in this space is excavated, it is surrounded and limited in a limited space, playing a role in strengthening the soil body, and it is not easy for mechanical equipment or the temporary construction platform to overturn.

[0044] There is soil reserved between the first row of temporary steel sheet piles 11 and the second row of temporary steel sheet piles 11. By using the first row of temporary steel sheet piles 11, the second row of temporary steel sheet piles 11 and the soil between them, water bodies can be well isolated to prevent river water from flowing back during construction.

[0045] S5. Install the third permanent sheet pile 4 on the opposite sides of the two rows of second permanent sheet piles 34, and install the cable 6 to connect the second permanent sheet pile 34 and the third permanent sheet pile 4.

[0046] As Figure 5 shown, the third permanent sheet pile 4 is located on the outside of the upstream section of the diversion channel 3, and there is a spacing between the third permanent sheet pile 4 and the second permanent sheet pile 34. The cable 6 is located between the third permanent sheet pile 4 and the second permanent sheet pile 34, and both ends of the cable 6 are respectively connected to the second permanent sheet pile 34 and the third permanent sheet pile 4. There are multiple cables 6, which are arranged at intervals along the length direction of the third permanent sheet pile 4.

[0047] As Figure 5 、 6 shown, pour the construction concrete top beam 5 on the tops of the first permanent sheet pile 33, the second permanent sheet pile 34 and the third permanent sheet pile 4 respectively. The cable 6 connecting the third permanent sheet pile 4 and the second permanent sheet pile 34 is actually connected to the concrete top beam 5 on the tops of the third permanent sheet pile 4 and the second permanent sheet pile 34.

[0048] In addition, it should be noted that the first permanent sheet pile 33, the second permanent sheet pile 34 and the third permanent sheet pile 4 are precast concrete components. By using precast concrete components, the construction efficiency can be effectively improved, the investment in large equipment can be reduced, and it is suitable for remote areas with few equipment resources.

[0049] S6. Excavate the soil between the two rows of first permanent sheet piles 33, construct the diversion channel bottom plate 31 of the downstream section of the diversion channel 3, and construct the diversion channel support rod 32.

[0050] As Figure 5 、 6 shown, layer by layer excavate the soil between the two rows of first permanent sheet piles 33 to construct the open channel of the diversion channel 3; lay gravel on the bottom of the open channel to form a gravel layer; pour plain concrete on the gravel layer to form the diversion channel bottom plate 31. Since the gravel layer has a certain thickness, when excavating the soil between the two rows of first permanent sheet piles 33, the thickness of the gravel layer should be considered to ensure that the final depth of the open channel meets the design requirements. When necessary, excavate drainage ditches and pump pits for collection and drainage. The excavation must consider balancing the side earth pressure and be carried out layer by layer.

[0051] A plurality of diversion canal support rods 32 are arranged at intervals along the length direction of the downstream section of the diversion canal 3. The two ends of each diversion canal support rod 32 are respectively connected to the concrete top beams 5 at the tops of two rows of first permanent sheet piles 33. In this embodiment, two diversion canal support rods 32 are arranged in the downstream section of the diversion canal. The distance between the two diversion canal support rods 32 is 8 meters. The diversion canal support rod 32 can also be called a diversion canal support beam. It adopts a cast-in-place concrete beam structure. Of course, concrete steel beam precast members can also be used. According to the number of the diversion canal support rods 32 arranged and the set length of the downstream section of the diversion canal, the installation positions of the diversion canal support rods 32 are determined, and connection corbels are precast on the concrete top beams 5 at the corresponding positions; connecting members are preset at the two ends of the diversion canal support rod 32, and the diversion canal support rod 32 is connected to the concrete top beam 5 by using the connecting members. Of course, in some embodiments, the diversion canal support rod 32 can be cast integrally with the concrete top beam 5.

[0052] The diversion canal bottom slab 31 is the main component for resisting the lateral earth pressure at the bottom of the diversion canal, and the lateral earth pressure is transmitted by the diversion canal support rod 32 and the concrete top beam 5 at the top.

[0053] S7. Construct the diversion canal bridge 7 across the upstream section of the diversion canal. After the construction of the diversion canal bridge 7 is completed, as Figure 7 shown. Since the diversion canal bridge 7 is a component for transmitting the lateral earth pressure at the top of the upstream section of the diversion canal, the diversion canal support rod 32 may not be constructed in the upstream section of the diversion canal.

[0054] S8. Excavate the soil body below the diversion canal bridge 7 and conduct structural bearing capacity calculation; excavate the inner soil body of the upstream section of the diversion canal, and synchronously excavate the outer soil body to balance the earth pressure; the excavated soil body is transported by multiple excavators of different models or sizes. The soil body excavation is carried out in sections and regions, and the lateral earth pressure is monitored during the excavation process.

[0055] After the excavation is completed, construct the diversion canal bottom slab 31 of the upstream section of the diversion canal. The diversion canal bottom slab 31 of the upstream section is also constructed one by one in sections, from the sand drainage tank 2 to the river direction, section by section.

[0056] Synchronously, the installation of the mechanical equipment of the sand drainer in the sand drainage tank 2 can be carried out. And the bridge sidewalk 71 can be constructed along both ends of the diversion canal bridge 7 synchronously. On the side of the bridge sidewalk 71 close to the river, a bridge road stone foundation 72 is laid. The diversion canal structure after the completion of the laying of the bridge road stone foundation 72 is as Figure 8 shown.

[0057] S9. Lay the gabion mattress 8 along the edge of the river. The diversion canal structure after the completion of the laying of the gabion mattress 8 is as Figure 9 shown.

[0058] The specific steps for laying the gabion mattress 8 include: placing the empty gabion mesh along the edge of the river channel on the side of the second permanent sheet pile 34 facing away from the third permanent sheet pile 4; connecting adjacent gabion meshes; and filling each gabion mesh with a filler. The filler includes rocks with a diameter not greater than 200 mm and not less than the mesh size of the gabion mesh.

[0059] The foundation of the gabion mattress 8 must be prepared by removing unsuitable materials and compacting to ensure a smooth and flat surface. First, install the geotextile, and each sheet must be fully overlapped (not less than 500 mm). Place the empty gabion meshes along the riverbank, and connect adjacent gabion meshes to each other along the upper and lower and vertical edges with tie bars or helical wires. Carefully fill with rocks, avoiding bulges, and provide a compact mass to minimize voids. The lid of the gabion mesh should be tightly stretched over the filler and fixed with wire.

[0060] After the gabion mattress 8 is laid, a trash screening net 9 is also installed upstream of the sand discharge pool 2 of the water diversion channel to block the trash in the river channel from entering the sand discharge pool 2.

[0061] S10. Pull out the temporary steel sheet pile 11 and dredge the riverbed.

[0062] After the construction of the water diversion channel structure is completed, remove the temporary steel sheet pile 11, using a 60-ton mobile crane with a vibrator. Dredge the riverbed to -2.0 m.

[0063] During the construction process of the water diversion channel structure, it also includes monitoring the ground deformation amount using the existing ground deformation monitoring system to further ensure the safety of the construction.

[0064] During the entire construction process of the water diversion channel, control the construction load away from the temporary steel sheet pile 11 to avoid overloading the temporary steel sheet pile 11. For example, keep the construction machinery and equipment on the constructed construction platform, and the construction platform can be the laid steel plates, and try to keep the machinery and equipment away from the temporary steel sheet pile 11.

[0065] For the temporary cut slope, when the final slope surface is exposed, temporary slope protection measures should be immediately implemented. For example, shotcrete walls or plastic sheets can be used to provide temporary protection against surface erosion, but they must be firmly fixed to the slope surface. In addition, during the construction process, the overall on-site drainage system should be reasonably controlled to avoid excessive hydrostatic pressure on the temporary steel sheet pile 11, the first permanent sheet pile 33, the second permanent sheet pile 34, and the third permanent sheet pile 4.

[0066] Before excavating the soil, the first permanent sheet pile 33 and the second permanent sheet pile 34 are constructed first as the side walls of the water diversion channel. Compared with the traditional method of excavating first and then constructing the side walls of the water diversion channel, the construction efficiency is improved. By constructing the temporary steel sheet pile 11 at the river edge to enclose the flared end 341 of the water diversion channel, the backflow of river water is effectively prevented and the infiltration of river water is blocked. Compared with the traditional method of constructing a U-shaped temporary cofferdam, the construction efficiency is higher, the water flow of the river is not cut off, the impact of river water is small, and the river bank is protected to avoid the collapse of the river bank during construction. In cooperation with the solidifying effect of the first permanent sheet pile 33, the second permanent sheet pile 34, and the third permanent sheet pile 4 on the river bank soil, the settlement or overturning of construction machinery and equipment is avoided, and the construction safety is improved. By constructing the third permanent sheet pile 4 connected by the cable 6 on the outside of the second permanent sheet pile 34, the reinforcement of the soil at the river edge is realized, the bearing capacity is improved, and the second permanent sheet pile 34 as the side wall of the water diversion channel is prevented from tipping over, further improving the construction safety. Compared with the prior art, the construction method of the present invention overcomes the problems of poor geological conditions in the river area, difficult construction of the water diversion channel, and low construction efficiency. The construction efficiency is improved and the construction period is shortened.

[0067] Based on the same inventive concept, the present invention also provides a river-side water diversion channel structure constructed by using the above construction method.

[0068] The river-side water diversion channel structure includes a suction pool 1, a first permanent sheet pile 33, a sand drainage pool 2, a second permanent sheet pile 34, a temporary steel sheet pile 11, a third permanent sheet pile 4, a water diversion channel bottom plate 31, a water diversion channel support rod 32, and a water diversion channel bridge 7.

[0069] The suction pool 1 is arranged on one side of the river, and is kept at a certain distance from the river to facilitate the construction of other structures of the water diversion channel structure.

[0070] Two rows of first permanent sheet piles 33 with a spacing are arranged upstream of the suction pool l and serve as the two side walls of the downstream section of the water diversion channel 3.

[0071] The sand drainage pool 2 is arranged upstream of the two rows of first permanent sheet piles 33.

[0072] Two rows of second permanent sheet piles 34 with a spacing are arranged upstream of the sand drainage pool 2 and serve as the two side walls of the upstream section of the water diversion channel 3; the two rows of second permanent sheet piles 34 extend from the sand drainage pool 2 to the edge of the river, and are separated from each other at the edge of the river to form the flared end 341 of the water diversion channel 3.

[0073] Two rows of temporary steel sheet piles 11 are arranged at the river edge to temporarily enclose the flared end 341.

[0074] The third permanent sheet pile 4 is connected to the opposite sides of the two rows of second permanent sheet piles 34 by the cable 6.

[0075] The bottom slab 31 of the water diversion channel is arranged between two rows of first permanent sheet piles 33 in the upstream section of the water diversion channel 3 and between two rows of second permanent sheet piles 34 in the downstream section.

[0076] The water diversion channel support rod 32 is arranged in the downstream section of the water diversion channel 3 to support and connect the concrete top beam 5 at the top of two rows of first permanent sheet piles 33.

[0077] The water diversion channel bridge 7 spans across the upstream section of the water diversion channel 3 to connect two rows of second permanent sheet piles 34.

[0078] The above is only the preferred implementation mode of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A construction method for a river-side water diversion canal, characterized in that, It includes the following steps: Construct a suction pool and a sand discharge pool on one side of the river channel; Construct two rows of spaced first permanent sheet piles between the suction pool and the sand discharge pool to serve as the two side walls of the downstream section of the water diversion channel respectively; Construct two rows of spaced second permanent sheet piles upstream of the sand discharge pool to serve as the two side walls of the upstream section of the water diversion channel respectively; the two rows of second permanent sheet piles are separated from each other at the edge of the river channel to form the flared end of the water diversion channel; Construct two rows of temporary steel sheet piles at the edge of the river channel for closing the flared end; Construct third permanent sheet piles on the opposite sides of the two rows of second permanent sheet piles, and install cables to connect the second permanent sheet piles and the third permanent sheet piles; Excavate the soil inside the water diversion channel and construct the bottom slab of the water diversion channel; Pull out the temporary steel sheet piles and dredge the riverbed.

2. The construction method of the riverside water diversion canal according to claim 1, characterized in that The step of constructing the two rows of temporary steel sheet piles at the edge of the river channel for closing the flared end includes: Construct the first row of temporary steel sheet piles for closing the flared end along the edge of the river channel; Parallel to the first row of temporary steel sheet piles, set the second row of temporary steel sheet piles at a distance on the side opposite to the river channel; retain the soil between the first row of temporary steel sheet piles and the second row of temporary steel sheet piles; Install tie connectors to connect the first row of temporary steel sheet piles and the second row of temporary steel sheet piles.

3. The construction method of the riverside water diversion canal according to claim 1, characterized in that The step of excavating the soil inside the water diversion channel and constructing the bottom slab of the water diversion channel includes: Excavate the soil between the two rows of first permanent sheet piles, construct the bottom slab of the downstream section of the water diversion channel, and construct the water diversion channel support rods; Construct the water diversion channel bridge spanning the upstream section of the water diversion channel; Excavate the soil under the water diversion channel bridge and perform structural bearing capacity calculation; excavate the soil inside the upstream section of the water diversion channel, and simultaneously excavate the outer soil to balance the earth pressure; construct the bottom slab of the upstream section of the water diversion channel.

4. The construction method of the river diversion canal according to claim 3, characterized in that, Before excavating the soil between the two rows of first permanent sheet piles, it also includes the steps of: pouring construction concrete top beams on the tops of the first permanent sheet piles, the second permanent sheet piles and the third permanent sheet piles respectively.

5. The construction method of the river diversion canal according to claim 4, characterized in that The step of constructing the water diversion channel support rods includes: arranging a plurality of water diversion channel support rods at intervals along the length direction of the downstream section of the water diversion channel, and connecting the two ends of each water diversion channel support rod to the concrete top beams at the tops of the two rows of first permanent sheet piles respectively.

6. The construction method of the riverside water diversion canal according to claim 3, characterized in that The step of excavating the soil between the two rows of first permanent sheet piles and constructing the bottom slab of the downstream section of the water diversion channel includes: layer by layer excavate the soil between the two rows of first permanent sheet piles to construct an open channel of the water diversion channel; lay gravel on the bottom of the open channel to form a gravel layer; pour plain concrete on the gravel layer to form the bottom slab of the water diversion channel.

7. The construction method of the riverside water diversion canal according to claim 1, characterized in that, The first permanent sheet piles, the second permanent sheet piles and the third permanent sheet piles are precast concrete members.

8. The construction method of the riverside water diversion canal according to claim 1, characterized in that, Before pulling out the temporary steel sheet piles and dredging the riverbed, it also includes laying a gabion mattress along the edge of the river channel.

9. The construction method of the river-side water diversion canal according to claim 8, characterized in that, The step of laying the gabion mattress along the edge of the river channel includes: placing empty gabion nets along the edge of the river channel on the side of the second permanent sheet piles opposite to the third permanent sheet piles; connecting adjacent gabion nets; filling each gabion net with fillers.

10. A river diversion canal structure constructed by the method as described in claim 1, characterized in that, It includes: A suction pool, arranged on one side of the river channel; Two rows of spaced first permanent sheet piles, arranged upstream of the suction pool, serving as the two side walls of the downstream section of the water diversion channel; The sand drainage pool is arranged upstream of two rows of first permanent sheet piles; Two rows of second permanent sheet piles with a spacing are arranged upstream of the sand drainage pool and serve as two side walls of the upstream section of the water diversion channel; The two rows of second permanent sheet piles respectively extend from the sand drainage pool to the edge of the river channel, and are far away from each other at the edge of the river channel to form the flared end of the water diversion channel; Two rows of temporary steel sheet piles are arranged at the edge of the river channel for temporarily closing the flared end; The third permanent sheet pile is connected to the opposite sides of the two rows of second permanent sheet piles through cables; The bottom plate of the water diversion channel is arranged between the two rows of first permanent sheet piles in the upstream section of the water diversion channel and between the two rows of second permanent sheet piles in the downstream section; The water diversion channel support rod is arranged in the downstream section of the water diversion channel to support the two rows of first permanent sheet piles; and The water diversion channel bridge spans the upstream section of the water diversion channel and connects the two rows of second permanent sheet piles.

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