Cofferdam structure and river excavation diversion method

Abstract

The invention relates to a cofferdam structure and a riverway excavation diversion method, and relates to the technical field of riverway treatment.The cofferdam structure is characterized in that dikes are arranged on the left side and the right side of a riverway zone A and a riverway zone C, a cofferdam structure is arranged in the riverway zone B in the length direction of the riverway zone B, and the height of the cofferdam structure is larger than or equal to that of the dikes; the cofferdam structure comprises three parts, wherein the first part is a water diversion weir which is arranged on the upstream of a river channel to be excavated and used for diversion of river water; the second part is pile foundations which are arranged in the river channel B subarea at intervals in the length direction of the river channel B subarea and are used for fixing the structure; and the third part comprises a plurality of water blocking assemblies which are sequentially spliced between the pile foundations and are used for playing a water blocking role. In the construction environment with the wide river face (the water flow of the river channel is larger), the cofferdam structure also has good stability, anchor cables do not need to be arranged between the cofferdam and the dike, and the problem that the river channel with the wide river face is deeply excavated can be solved.

Description

Technical Field

[0001] The present application relates to the field of river channel excavation, and in particular to a cofferdam structure and a river channel excavation diversion method. Background Art

[0002] In order to increase the flood season flow of the river channel, it is necessary to widen and deepen the river channel. Generally, in order to avoid demolition and land acquisition, more solutions are to deepen the river channel; the core of this solution is to divert the river channel to create dry construction conditions for deepening the river channel.

[0003] Currently, for river channel deepening, the river channel is first divided into juxtaposed areas A, B, and C along the width direction. Then, in the dry season, a diversion ditch is first excavated in area A to ensure that there is no water in the river channel outside the diversion ditch; then a cofferdam equal in height to the dike is built in area B; then the deepening treatment of area C is carried out until the deepening treatment of the entire area C is completed; when entering the normal water period, the ditch formed by the left dike and the cofferdam can be used for diversion; when entering the high water period, the water flow direction of the upstream of the river channel can be adjusted, and the cofferdam, the right dike, and area C are used for diversion. Since area C has completed the deepening treatment of the original river channel, safe diversion can also be achieved during the high water period; afterwards, the deepening treatment of area A is completed, and a diversion pipe is laid in area A where the deepening treatment has been completed. In the dry season, the upstream water is adjusted to use the diversion pipe for diversion to ensure that there is no water in areas A and B; then the cofferdam is demolished under dry construction conditions, and the deepening treatment of area B is carried out, and finally the operation of deepening the entire river channel is completed; finally, the diversion pipe is demolished and recycled, and the river channel resumes water flow.

[0004] The above method for river channel deepening is relatively useful when dealing with the excavation of conventional river channels; however, there are construction difficulties in river channel areas with a relatively wide river surface. Because the water flow of a river channel with a wide river surface is greater, in order to ensure the stability of the cofferdam, it is necessary to stretch anchor cables between the cofferdam and the dike; but in actual construction, because the distance is far, it is very difficult for the anchor cables to reach the dike. Even if they can reach the dike, there is not much actual pulling force, and it does not play much of a fixing role for the cofferdam. Summary of the Invention

[0005] In order to improve the problem of deepening the excavation of a river channel with a relatively wide river surface, the present application provides a cofferdam structure and a river channel excavation diversion method.

[0006] First, a cofferdam structure provided by this application adopts the following technical solution: A cofferdam structure includes dividing a river channel into parallel River Channel A partition, River Channel B partition, and River Channel C partition along the width direction. There are dikes on the left and right sides of River Channel A partition and River Channel C partition. A cofferdam structure is arranged along the length direction of River Channel B partition within River Channel B partition. The height of the cofferdam structure is higher than or equal to the height of the dike. The cofferdam structure includes three parts. The first part is a water diversion weir arranged upstream of the river channel to be excavated for diverting river water. The second part is a pile foundation arranged at intervals along the length direction of River Channel B partition within River Channel B partition for structural fixation. The third part is a number of water blocking components sequentially spliced between the pile foundations for water blocking.

[0007] Preferably, the water blocking component includes a dragon skeleton for support and water blocking plates fixed on both sides of the dragon skeleton. The dragon skeleton includes a rectangular frame and cross-shaped frames fixed to the top and bottom of the rectangular frame. The water blocking plates are vertically fixed on both sides of the dragon skeleton corresponding to River Channel A partition and River Channel C partition.

[0008] Preferably, an arc-shaped water blocking plate is arranged in the gap between the two water blocking plates along the vertical direction. The top and bottom of the arc-shaped water blocking plate are flush with the water blocking plates. The cross-section of the arc-shaped water blocking plate is C-shaped and the convex side faces River Channel A partition or River Channel C partition.

[0009] Preferably, a receiving cavity is formed between the dragon skeleton and the water blocking plates.

[0010] Preferably, an auxiliary positioning component is also arranged in the dragon skeleton. The auxiliary positioning component includes a guide cylinder vertically fixed on the dragon skeleton and an anchor rod vertically inserted into the guide cylinder and used to insert into River Channel B partition.

[0011] Preferably, five groups of the water blocking components are installed between every two of the pile foundations.

[0012] Preferably, a traction component for pulling the dragon skeleton is also installed on the pile foundation.

[0013] Preferably, the traction component includes a mounting seat, a traction roller, a driving member, and a traction rope. The mounting seat is fixed on the top of the pile foundation. The traction roller is horizontally rotatably installed on the mounting seat. Traction rope mounting ports are spaced apart at both ends of the traction roller. The end of the traction rope is installed on the traction roller through the traction rope mounting port. A plurality of traction rope redirecting ports are also arranged around the traction roller in the middle area along the length direction of the traction roller. The driving member is installed on the mounting seat and the output end of the driving member is connected to the traction roller.

[0014] Preferably, the traction assembly also includes a traction adjustment frame installed on the mounting seat; an adjustment roller 1 and an adjustment roller 2 are horizontally rotatably installed on the traction adjustment frame, the diameters of the adjustment roller 1 and the adjustment roller 2 are the same and smaller than the diameter of the traction roller, the position of the adjustment roller 1 is higher than the position of the traction roller, and the position of the adjustment roller 2 is located between the traction roller and the adjustment roller 1 and is lower than the position of the adjustment roller 1.

[0015] Furthermore, the present application also provides a river channel excavation and diversion method, comprising the following steps: first, in the dry season, a diversion ditch is excavated in the river channel A partition to ensure that there is no water in the river channel outside the diversion ditch, and then a cofferdam structure with the same height as the embankment is built in the river channel B partition; secondly, when building the cofferdam structure, the foundation area is leveled, the water diversion weir is installed, the pile foundation is installed, the traction component is installed, the water blocking component is installed, and the auxiliary positioning component is installed in sequence; then, the river channel C partition is deepened until the deepening of the entire river channel C partition is completed; when entering the flat water period, the ditch formed by the left embankment and cofferdam is used for diversion; when entering the flood season, the direction of the water from the upstream of the river is adjusted, and the water diversion weir, the cofferdam structure and the right The dike and the C section of the river are diverted. Since the C section of the river has completed the deepening of the original river channel, it can be safely diverted during the flood season. After that, the deepening of the A section of the river is completed, and the diversion pipe is laid in the A section of the river that has completed the deepening. In the dry season, the diversion pipe is used to divert the water by adjusting the upstream water to ensure that there is no water in the A section of the river and the B section of the river. Then, the cofferdam structure is dismantled under dry construction conditions. When dismantling the cofferdam structure, the auxiliary positioning components and the traction components are first dismantled, and then the water blocking plate is dismantled, and then the keel frame is dismantled, and then the pile foundation is pulled out and recovered, and then the water diversion weir is dismantled; finally, the B section is deepened to complete the entire operation of deepening the river channel, the diversion pipe is dismantled and recovered, and the water flow of the river is restored.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. First of all, in the construction environment of a wide river (larger water flow in the river), the cofferdam structure of this application also has good stability, and there is no need to pull anchor cables between the cofferdam and the embankment, which can improve the problem of deepening the river channel with a wider river surface.

[0017] 2. Secondly, by installing a traction component on the pile foundation, the keel frame can be pulled toward the pile foundation through the traction component, and each keel frame can be moved to a suitable installation position with the assistance of manual labor to reduce the difficulty of installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the first embodiment of the present application; Figure 2 is a structural schematic diagram of the cofferdam structure of Example 1 of the present application; Figure 3 It is a schematic structural diagram of the water diversion weir in the first embodiment of the present application; Figure 4 It is a schematic structural diagram of the keel frame and the auxiliary positioning component in the first embodiment of the present application; Figure 5 It is a schematic structural diagram of the fixing component in the first embodiment of the present application; Figure 6 It is a schematic structural diagram of the cofferdam structure in the second embodiment of the present application; Figure 7 It is a schematic structural diagram of the traction component in the second embodiment of the present application; Figure 8 It is a schematic diagram of the traction route of the traction component in the second embodiment of the present application; Figure 9 It is a cross-sectional view of the telescopic member in the second embodiment of the present application.

[0019] In the figure, 1, river channel; 11, river channel A sub-zone; 12, river channel B sub-zone; 13, river channel C sub-zone; 2, dike; 3, cofferdam structure; 31, water diversion weir; 311, water diversion support; 312, water diversion plate; 32, pile foundation; 33, water blocking component; 331, keel frame; 3311, rectangular frame; 3312, cross-shaped frame; 332, water blocking plate; 3321, Larsen steel sheet pile; 3322, fastening screw; 3323, arc-shaped water blocking plate; 333, accommodation cavity; 34, auxiliary positioning component; 341, guiding cylinder; 342, anchor rod; 3421, hammering head; 3422, rod part; 3423, tip; 35, fixing component; 351, base plate; 352, U-shaped frame; 353, fixing plate; 36, traction component; 361, mounting seat; 362, traction roller; 3621, traction rope mounting opening; 3622, traction rope redirecting opening; 363, driving member; 364, traction adjusting frame; 3641, adjusting seat; 36411, mounting shaft hole; 3642, adjusting roller one; 3643, adjusting roller two; 3644, telescopic member; 36441, base shell; 36442, shaft joint; 36443, sliding plate; 36444, compression spring. Detailed implementation manners

[0020] The following is a further detailed description of the present application in conjunction with the attached Figure 1 - attached Figure 9 , and make a further detailed description of the present application.

[0021] Embodiment 1: A cofferdam structure, referring to Figure 1, the river channel 1 is divided into juxtaposed river channel A sub - region 11, river channel B sub - region 12, and river channel C sub - region 13 in the width direction. There are dikes 2 on the left and right sides of the river channel A sub - region 11 and the river channel C sub - region 13. A cofferdam structure 3 is arranged along the length direction of the river channel B sub - region 12 within the river channel B sub - region 12, and the height of the cofferdam structure 3 is higher than or equal to the height of the dike 2.

[0022] Refer to Figure 1 , Figure 2 , the cofferdam structure 3 mainly includes three parts. The first part is a water - dividing weir 31 arranged upstream of the river channel 1 to be excavated for diverting river water; the second part is a pile foundation 32 arranged at intervals along the length direction of the river channel B sub - region 12 within the river channel B sub - region 12 for structural fixation; the third part is a number of water - blocking components 33 sequentially spliced between the pile foundations 32 for water - blocking.

[0023] Refer to Figure 2 , Figure 3 , the water - dividing weir 31 includes a water - dividing support 311 for support and a water - dividing plate 312 fixed on the water - dividing support 311 for water - dividing; there are at least two water - dividing supports 311, located in the upper and lower parts respectively. The water - dividing support 311 includes a bent rod and a strut; the bent rod is horizontally arranged with an angle on the horizontal plane, and the angle can be an acute angle, a right angle, or an obtuse angle. The specific angle is mainly designed based on the adaptability of the width of the river channel 1 to be diverted on - site. The tip of the bent rod faces the upstream of the river channel 1; the strut is horizontally arranged and fixed between the angles of the bent rod for supporting the bent rod; the water - dividing plate 312 has two parts, vertically arranged and fixed on the bent rod, and the two parts of the water - dividing plate 312 form a water - blocking surface with an angle; the water - dividing plate 312 can be an integral plate or a combined structure formed by splicing multiple Larssen steel sheet piles 3321.

[0024] The pile foundation 32 is a hollow pile with a rectangular cross - section. It can be a steel pile foundation 32 treated with rust prevention or a pile foundation 32 of reinforced concrete structure. Before the installation or construction of the pile foundation 32, the ground needs to be excavated first, and the depth should be able to fully penetrate the silt layer or be not less than 5m - 8m.

[0025] Refer to Figure 2 , Figure 4, the water-blocking component 33 includes a dragon skeleton 331 for support and water-blocking plates 332 fixed on both sides of the dragon skeleton 331. The dragon skeleton 331 includes a rectangular frame 3311 and cross-shaped frames fixed to the top and bottom of the rectangular frame 3311. The rectangular frame 3311 and the cross-shaped frame 3312 form a relatively stable rectangular frame structure. The water-blocking plates 332 are vertically fixed on both sides of the dragon skeleton 331 corresponding to the river channel A partition 11 and the river channel C partition 13. The water-blocking plates 332 can be an integral plate or a combined structure formed by splicing multiple Larssen steel sheet piles 3321. The water-blocking plates 332 are fixed to the rectangular frame 3311 through fastening screws 3322.

[0026] An arc-shaped water-blocking plate 3323 is arranged vertically at the gap between the two water-blocking plates 332. The top and bottom of the arc-shaped water-blocking plate 3323 are flush with the water-blocking plates 332, mainly to supplement the transition gap between the two water-blocking plates 332. The cross-section of the arc-shaped water-blocking plate 3323 is C-shaped and the convex side faces the river channel A partition 11 or the river channel C partition 13. Due to the characteristics of its arc-shaped structure, the arc-shaped water-blocking plate 3323 has a certain deformation ability and can adapt to the gaps of the water-blocking plates 332 with width differences. The two sides of the arc-shaped water-blocking plate 3323 are connected to the corresponding side edges of the water-blocking plates 332.

[0027] An accommodation cavity 333 is formed between the dragon skeleton 331 and the water-blocking plates 332. During use, the sand or silt excavated from the river channel A partition 11 or the river channel C partition 13 can be dumped into the accommodation cavity 333 to increase the water-blocking ability of the water-blocking component 33 and its ability to resist water flow impact.

[0028] An auxiliary positioning component 34 is also arranged in the dragon skeleton 331. The auxiliary positioning component 34 includes a guide cylinder 341 vertically fixed on the dragon skeleton 331 and an anchor rod 342 vertically inserted into the guide cylinder 341 for inserting into the river channel B partition 12. The upper and lower ends of the guide cylinder 341 are fixedly connected to the cross-shaped frame 3312. The anchor rod 342 includes a hammering head 3421, a rod part 3422, and a pointed part 3423. The rod part 3422 is vertically inserted into the guide cylinder 341 and its length is longer than the length of the guide cylinder 341. The hammering head 3421 is integrally connected to the upper end of the rod part 3422 and its diameter is larger than the diameter of the rod part 3422. The pointed part 3423 is integrally connected to the lower end of the rod part 3422.

[0029] Refer to Figure 4 、 Figure 5The keel frame 331 and the pile foundation 32 as well as the keel frames 331 and the keel frames 331 are connected by a fixing assembly 35, the fixing assembly 35 includes a base plate 351, a U-shaped frame 352 and a fixing plate 353, the base plate 351 is horizontally fixed to the rectangular frame 3311; the U-shaped frame 352 includes a U-shaped bottom and two side edges, the U-shaped frame 352 is horizontally arranged, and its U-shaped bottom is fixedly connected to the base plate 351 by bolts, and the two sides of the U-shaped frame 352 are connected to the fixing plate 353 by bolts; the fixing plate 353 has two pieces, which are respectively fixed on the rectangular frame 3311 at the positions on both sides of the U-shaped frame 352.

[0030] Corresponding to the installation of the pile foundation 32 and the adjacent keel frame 331, two substrates 351 can be installed on the rectangular frame 3311 adjacent to the pile foundation 32, and a substrate 351 can be installed on the subsequent rectangular frame 3311 on the side away from the pile foundation 32. The U-shaped frame 352 can make the installation of the keel frame 331 and the pile foundation 32 and the installation between the keel frames 331 and keel frames 331 have strong stability and impact resistance; at the same time, the structure of the U-shaped frame 352 is more suitable for the installation of the structural position where there is a gap between the keel frames 331 and keel frames 331. In order to better suit the installation between keel frames 331 and keel frames 331, the installation between the U-shaped frame 352 and the fixing plate 353 can be designed to be installed through strip holes, so that the bolts can adjust the installation position in the strip holes, and then the installation position of the U-shaped frame 352 can be adaptively adjusted according to the different sizes of the gaps between keel frames 331 and keel frames 331, and finally the bolts are tightened to fix the final installation position, which is more suitable for the installation mode of keel frames 331 and keel frames 331.

[0031] The implementation principle of this embodiment is: Before deepening the river channel 1, the river channel 1 is first divided into parallel river channel A partition 11, river channel B partition 12 and river channel C partition 13 along the width direction, and then a diversion ditch is first excavated in the river channel A partition 11 during the dry season to ensure that there is no water in the river channel 1 outside the diversion ditch; then a cofferdam structure 3 with the same height as the embankment 2 is built in the river channel B partition 12.

[0032] When constructing the cofferdam structure 3, first level the foundation area in the B section 12 of the river channel for constructing the cofferdam structure 3 (dredging and leveling the cushion soil); then install the diversion weir 31 at the uppermost upstream position. The diversion weir 31 can make the upstream water flow more easily enter the diversion ditch by its own structure. At the same time, when the sudden water flow increases, it also guides the water flow into the diversion ditch and the C section 13 of the river channel, without affecting the cofferdam structure 3 in the B section 12 of the river channel; after that, install the pile foundation 32. Before installing the pile foundation 32, the number of pile foundations 32 should be planned according to the geological conditions in the B section 12 of the river channel, mainly the differences in the thickness of the silt layer and the hardness of the geology. Generally, the better the geological conditions (thin silt layer and hard geology), the fewer the planned number of pile foundations 32, and the worse the geological conditions, the more the planned number of pile foundations 32. As shown in Figure 1 shown in Figure 1 , this is the situation where the pile foundations 32 are the most dense; after planning the number of pile foundations 32, it is necessary to draw lines to find the installation points of the pile foundations 32 on the foundation in sequence. Then, excavate at the installation points of the pile foundations 32, and the excavation depth should be able to fully penetrate the silt layer or be greater than 7m - 10m to form a foundation pit; then, according to the material of the pile foundation 32 (steel pile foundation 32, reinforced concrete pile foundation 32), construct and install a foundation at the bottom of the foundation pit. The installation foundation is generally a reinforced concrete platform structure with an insertion hole adapted to the size of the pile foundation 32 in the middle; after the installation foundation solidifies, insert the pile foundation 32 into the installation foundation and fill the foundation pit; then install the water-blocking component 33. After the water-blocking component 33 is installed, according to the magnitude of the water flow impact force, fill the silt or sand remaining from the excavation of the diversion ditch in the accommodation cavity 333 in some areas, or insert the anchor rod 342 into the guiding cylinder 341 to improve the water-blocking ability and the ability to resist water flow impact of the cofferdam structure 3 through the auxiliary positioning component 34 and the weight of the sand and gravel.

[0033] Compared with the prior art, even in the construction environment with a wide river surface (greater water flow in the river channel 1), the cofferdam structure 3 also has good stability and does not require additional guy cables to be installed between the cofferdam and the dike 2.

[0034] After the construction of the cofferdam structure 3 is completed, the deepening treatment of the river channel C area 13 is then carried out until the deepening treatment of the entire river channel C area 13 is completed; when entering the normal water period, the ditch formed by the left dike 2 and the cofferdam can be used for diversion; when entering the high water period, the water flow direction of the upstream of the river channel 1 can be adjusted, and the diversion is carried out by using the water diversion weir 31, the cofferdam structure 3, the right dike 2 and the river channel C area 13. Since the deepening treatment of the original river channel 1 has been completed in the river channel C area 13, safe diversion can also be achieved during the high water period; afterwards, the deepening treatment of the river channel A area 11 is completed, and diversion pipes are laid in the deepened river channel A area 11. During the low water period, the upstream water is adjusted to use the diversion pipes for diversion to ensure that there is no water in the river channel A area 11 and the river channel B area 12; then the cofferdam structure 3 is removed under dry construction conditions; when removing the cofferdam structure 3, the auxiliary positioning component 34 is first removed, then the water blocking plate 332 is removed, then the keel frame 331 is removed, then the pile foundation 32 is pulled out and recovered, and then the water diversion weir 31 is removed; finally, the B area is deepened to complete the operation of the entire excavated river channel 1, the diversion pipes are removed and recovered, and the river channel 1 resumes water flow.

[0035] Embodiment 2: A cofferdam structure, referring to Figure 6 , the difference between this embodiment and Embodiment 1 is that five groups of water blocking components 33 are installed between every two pile foundations 32.

[0036] Through the above settings, in the foundation area with relatively good geological conditions, relying on fewer pile foundations 32 and auxiliary positioning components 34 can provide better fixing force for the water blocking components 33. Therefore, more water blocking components 33 can be installed between the pile foundations 32 at one time, reducing the installation of pile foundations 32 and improving the construction efficiency. The number of water blocking components 33 between the pile foundations 32 can also exceed five groups, preferably between two groups and five groups.

[0037] Embodiment 3: A cofferdam structure, referring to Figure 7 、 Figure 8 , the difference between this embodiment and Embodiment 2 is that a traction component 36 for pulling the keel frame 331 is also installed on the pile foundation 32.

[0038] During the installation process of the keel frame 331, each keel frame 331 is mainly placed in the installation area by a crane. The keel frame 331 after placement has position deviation, which makes subsequent installation difficult. By installing a traction component 36 on the pile foundation 32, the keel frame 331 can be pulled toward the pile foundation 32 by the traction component 36, and each keel frame 331 can be moved to a suitable installation position with the assistance of synchronous manpower, thereby reducing the difficulty of installation. In order to make the installation of the keel frame 331 more convenient, a thin iron sheet can also be placed in the installation area below the keel frame 331 when the keel frame 331 is hoisted, so that the keel frame 331 has less resistance during movement and is more convenient to move. After the keel frame 331 is fully in place, the thin steel plate can be pulled out for subsequent use.

[0039] Specifically, the traction assembly 36 includes a mounting seat 361, a traction roller 362, a driving member 363 and a traction adjustment frame 364; two mounting seats 361 are symmetrically arranged and fixed to the top of the pile foundation 32 by bolts. Generally, during the manufacturing process of the pile foundation 32, a base for installing the mounting seat 361 and a lifting ring for the crane will be reserved on the upper part or top of the pile foundation 32. Nuts are installed in the base. After the mounting seat 361 is placed on the base, the bolts can be screwed into the nuts of the base to fix the mounting seat 361. After the keel frames 331 between the current pile foundations 32 are moved into place, the mounting seats 361 and the base can be disassembled, and the traction assembly 36 can be installed on the subsequent pile foundation 32 for use; the traction drum 362 is horizontally rotatably installed on the two mounting seats 361, and the two ends of the traction drum 362 are spaced apart with traction rope installation openings 3621, and the end of the traction rope can be installed on the traction drum 362 through the traction rope installation openings 3621; in the middle area of the traction drum 362, the traction drum 362 is also rotated around the traction drum 362 along the length direction. A plurality of traction rope redirection openings 3622 are provided. After the traction rope passes through the traction rope installation opening 3621, it can pass through the traction rope redirection opening 3622 again, thereby changing the position of the traction roller 362 for winding the traction rope, and can better adapt to the keel frames 331 of different distances; the driving member 363 is installed on any one of the installation seats 361, and the output end of the driving member 363 is connected to the traction roller 362. The driving member 363 can adopt a rotating power output member such as a servo motor; the traction adjustment frame 364 has two parts, which are symmetrically arranged and integrally connected to the installation seat 361, and an adjusting roller 1 3642 and an adjusting roller 2 3643 are horizontally rotatably installed between the traction adjustment frame 364. The diameters of the adjusting roller 1 3642 and the adjusting roller 2 3643 are the same and smaller than the diameter of the traction roller 362. The position of the adjusting roller 1 3642 is higher than the position of the traction roller 362, and the position of the adjusting roller 2 3643 is located between the traction roller 362 and the adjusting roller 1 3642 and is lower than the position of the adjusting roller 1 3642.

[0040] After the towing rope passes through the towing rope installation port 3621 and the towing rope redirecting port 3622, it first bypasses the lower part of the adjusting roller 1 3642, then winds around the upper part of the adjusting roller 2 3643, and finally is connected to the corresponding keel frame 331. The settings of the towing rope adjusting frame, the adjusting roller 1 3642 and the adjusting roller 2 3643 can adjust the tension of the towing rope and can also adjust the height of the towing position of the towing rope, so that the towing rope has a more reasonable height and force to tow the keel frame 331.

[0041] In order to better adjust the height range of the towing rope, mounting shaft holes 36411 for mounting the adjusting roller 1 3642 are symmetrically provided on the towing adjusting frame 364, and telescopic members 3644 are also installed at both ends of the adjusting roller 1 3642.

[0042] Combined Figure 9 , the telescopic member 3644 includes a base shell 36441, a shaft joint 36442, a sliding plate 36443 and a compression spring 36444. The base shell 36441 is in a cylindrical structure and through holes for the shaft joint 36442 to pass through are reserved at both ends. The base shell 36441 is coaxially arranged with the adjusting roller 1 3642 and is fixedly connected to the adjusting roller 1 3642 at one end; the shaft joint 36442 is coaxially arranged with the base shell 36441 and is slidably connected in the base shell 36441, and both ends of the shaft joint 36442 pass through the reserved through holes of the base shell 36441; the sliding plate 36443 is slidably connected in the base shell 36441, and the sliding direction is the same as the axial direction of the base shell 36441. The sliding plate 36443 is fixedly connected to the shaft joint 36442, and the sliding plate 36443 is located on the side close to the towing adjusting frame 364 in the base shell 36441; the compression spring 36444 is located in the base shell 36441 and is sleeved on the shaft joint 36442, and the end of the compression spring 36444 abuts against the sliding plate 36443.

[0043] By adopting the above settings, pressing the shaft joint 36442 can make the shaft joint 36442 retract into the base shell 36441 and the adjusting roller 1 3642, and then the adjusting roller 1 3642 can be removed and installed into another set of mounting shaft holes 36411 to adjust the position height of the adjusting roller 1 3642, so as to better adjust the towing height of the towing rope.

[0044] A river channel 1 excavation and diversion method in this application mainly includes the following steps: First, before the river channel 1 is dug deeper, the river channel 1 is divided into juxtaposed river channel A sub-region 11, river channel B sub-region 12 and river channel C sub-region 13 along the width direction. Then, in the dry season, a diversion ditch is first excavated in the river channel A sub-region 11 to ensure that there is no water in the river channel 1 outside the diversion ditch. Then, a cofferdam structure 3 equal in height to the dike 2 is built in the river channel B sub-region 12; Secondly, when constructing the cofferdam structure 3, the foundation area is leveled, the water diversion weir 31 is installed, the pile foundation 32 is installed, the traction assembly 36 is installed, the water blocking assembly 33 is installed, and the auxiliary positioning assembly 34 is installed in sequence; Then, the deepening treatment of the river channel C sub-region 13 is carried out until the deepening treatment of the entire river channel C sub-region 13 is completed; when the flat water period arrives, the ditch formed by the left dike 2 and the cofferdam can be used for diversion; when the flood period arrives, the water flow direction of the upstream of the river channel 1 can be adjusted, and the water diversion weir 31, the cofferdam structure 3, the right dike 2 and the river channel C sub-region 13 are used for diversion. Since the deepening treatment of the original river channel 1 has been completed in the river channel C sub-region 13, safe diversion can also be achieved during the flood period; afterwards, the deepening treatment of the river channel A sub-region 11 is completed, and a diversion pipe is laid in the deepened river channel A sub-region 11. During the dry season, the upstream water is adjusted to use the diversion pipe for diversion to ensure that there is no water in the river channel A sub-region 11 and the river channel B sub-region 12; Then, the cofferdam structure 3 is demolished under dry construction conditions; when demolishing the cofferdam structure 3, the auxiliary positioning assembly 34 and the traction assembly 36 are first demolished, then the water blocking plate 332 is demolished, then the keel frame 331 is demolished, then the pile foundation 32 is pulled out and recycled, and then the water diversion weir 31 is demolished; finally, the B area is deepened to complete the operation of the entire excavated river channel 1, the diversion pipe is demolished and recycled, and the river channel 1 resumes water flow.

[0045] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A cofferdam structure, which divides a river channel (1) into juxtaposed river channel A sub-areas (11), river channel B sub-areas (12) and river channel C sub-areas (13) in the width direction. There are dikes (2) on the left and right sides of the river channel A sub-areas (11) and the river channel C sub-areas (13). A cofferdam structure (3) is arranged along the length direction of the river channel B sub-areas (12) within the river channel B sub-areas (12). The height of the cofferdam structure (3) is higher than or equal to the height of the dikes (2), and it is characterized in that, The cofferdam structure (3) includes three parts. The first part is a water diversion weir (31) arranged upstream of the river channel (1) to be excavated for diverting river water. The second part is a pile foundation (32) arranged at intervals along the length direction of the river channel B partition (12) in the river channel B partition (12) for structural fixation. The third part is a number of water blocking components (33) sequentially spliced between the pile foundations (32) for water blocking.

2. The cofferdam structure according to claim 1, characterized in that, The water blocking component (33) includes a dragon skeleton (331) for support and water blocking plates (332) fixed on both sides of the dragon skeleton (331). The dragon skeleton (331) includes a rectangular frame (3311) and cross-shaped frames fixed to the top and bottom of the rectangular frame (3311). The water blocking plates (332) are vertically fixed on both sides of the dragon skeleton (331) corresponding to the river channel A partition (11) and the river channel C partition (13).

3. A cofferdam structure according to claim 2, characterized in that, An arc-shaped water blocking plate (3323) is arranged vertically at the gap between the two water blocking plates (332). The top and bottom of the arc-shaped water blocking plate (3323) are flush with the water blocking plates (332). The cross-section of the arc-shaped water blocking plate (3323) is C-shaped and the convex side faces the river channel A partition (11) or the river channel C partition (13).

4. A cofferdam structure according to claim 2 or 3, characterized in that, A receiving cavity (333) is formed between the dragon skeleton (331) and the water blocking plates (332).

5. A cofferdam structure according to claim 2, characterized in that, An auxiliary positioning component (34) is also arranged in the dragon skeleton (331). The auxiliary positioning component (34) includes a guiding cylinder (341) vertically fixed on the dragon skeleton (331) and an anchor rod (342) vertically inserted into the guiding cylinder (341) for inserting into the river channel B partition (12).

6. A cofferdam structure according to claim 2, characterized in that, Five groups of the water blocking components (33) are installed between every two of the pile foundations (32).

7. A cofferdam structure according to claim 6, characterized in that, A traction component (36) for traction of the dragon skeleton (331) is also installed on the pile foundation (32).

8. A cofferdam structure according to claim 7, characterized in that, The traction component (36) includes a mounting seat (361), a traction roller (362), a driving member (363) and a traction rope. The mounting seat (361) is fixed on the top of the pile foundation (32). The traction roller (362) is horizontally rotatably installed on the mounting seat (361). Traction rope mounting openings (3621) are arranged at both ends of the traction roller (362) at intervals. The end of the traction rope is installed on the traction roller (362) through the traction rope mounting opening (3621). A plurality of traction rope redirecting openings (3622) are also arranged along the length direction around the traction roller (362) in the middle area of the traction roller (362). The driving member (363) is installed on the mounting seat (361) and the output end of the driving member (363) is connected to the traction roller (362).

9. A cofferdam structure according to claim 8, characterized in that, The traction assembly (36) further includes a traction adjustment frame (364) mounted on the mounting base (361); a first adjustment roller (3642) and a second adjustment roller (3643) are horizontally rotatably mounted on the traction adjustment frame (364). The first adjustment roller (3642) and the second adjustment roller (3643) have the same diameter and are smaller than the diameter of the traction roller (362). The position of the first adjustment roller (3642) is higher than the position of the traction roller (362), and the position of the second adjustment roller (3643) is between the traction roller (362) and the first adjustment roller (3642) and lower than the position of the first adjustment roller (3642).

10. A river channel excavation diversion method, characterized in that, including the following steps, First, during the dry season, a diversion ditch is excavated in the river channel A area (11) first, so as to ensure that there is no water in the river channel (1) outside the diversion ditch, and then a cofferdam structure (3) with the same height as the dike (2) is built in the river channel B area (12); Second, when building the cofferdam structure (3), the foundation area is leveled, the water diversion weir (31) is installed, the pile foundation (32) is installed, the traction assembly (36) is installed, the water blocking assembly (33) is installed, and the auxiliary positioning assembly (34) is installed in sequence; Then, the river channel C area (13) is deepened until the deepening treatment of the entire river channel C area (13) is completed; when entering the normal water season, the ditch formed by the left dike (2) and the cofferdam structure (3) is used for diversion; when entering the flood season, the water flow direction of the upstream water in the river channel (1) is adjusted, and the water diversion weir (31), the cofferdam structure (3), the right dike (2) and the river channel C area (13) are used for diversion. Since the river channel C area (13) has completed the deepening treatment of the original river channel (1), safe diversion can also be carried out during the flood season; After that, the deepening treatment of the river channel A area (11) is completed, and a diversion pipe is laid in the deepened river channel A area (11). During the dry season, the upstream water is adjusted to use the diversion pipe for diversion to ensure that there is no water in the river channel A area (11) and the river channel B area (12); Then, the cofferdam structure (3) is demolished under dry construction conditions; when demolishing the cofferdam structure (3), the auxiliary positioning assembly (34) and the traction assembly (36) are demolished first, then the water blocking plate (332) is demolished, then the keel frame (331) is demolished, then the pile foundation (32) is pulled out and recycled, and then the water diversion weir (31) is demolished; Finally, the B area is deepened to complete the operation of the entire excavated river channel (1), the diversion pipe is demolished and recycled, and the river channel (1) resumes water flow.

Images