River-crossing aqueduct diversion cofferdam

Abstract

The river-crossing aqueduct diversion cofferdam comprises a diversion channel, a downstream cofferdam body, an upstream cofferdam body and a turning platform, one end of the downstream cofferdam body and one end of the upstream cofferdam body are connected with a beach shortcut on one side, the other end of the downstream cofferdam body and the other end of the upstream cofferdam body are connected through the turning platform, and the downstream side of the downstream cofferdam body and the downstream side of the upstream cofferdam body are each provided with an underwater dumping I area; the downstream cofferdam and the upstream cofferdam are respectively provided with an underwater dumping area I and an underwater dumping area II, the upstream side of the downstream cofferdam and the upstream side of the upstream cofferdam are respectively provided with an underwater dumping area II, the space between the underwater dumping areas I and the underwater dumping areas II of the downstream cofferdam and the upstream cofferdam is respectively filled with an integral anti-seepage wall, the integral anti-seepage wall comprises a clay core groove and a clay core wall which are sequentially arranged from bottom to top, and the clay core groove is formed by digging out a river bed permeable layer and replacing and filling the river bed permeable layer with clay. And the clay core wall is formed by rolling and compacting clay. According to the utility model, a river-crossing operation traffic network is formed in the construction process, so that the construction operation requirements of equipment entry and exit, material transportation and the like at the beach part can be met, a larger operation space is provided for aqueduct construction, and parallel construction operation can be realized.

Description

Technical Field

[0001] The utility model relates to the construction of a river-crossing structure, in particular to a river-crossing aqueduct diversion cofferdam. Background Art

[0002] Aqueducts are overhead water channels that cross rivers, roads, and valleys. At present, the body of aqueducts across rivers, columns and other components are mostly prefabricated and hoisted, and the foundation of aqueducts generally adopts a large-sized gravity foundation. Sufficient space is required for the construction of prefabricated hoisting and large-sized gravity foundations. The diversion cofferdams of aqueducts across rivers generally adopt sheet piles, double walls, steel casings and other forms. The construction space of cofferdams in the form of sheet piles, double walls, and steel casings is narrow, which is not conducive to the overall construction progress and has high costs. Utility Model Content

[0003] The technical problem to be solved by the utility model is that, in view of the shortcomings of the existing diversion cofferdam, which has narrow construction space, is not conducive to promoting the overall construction progress and has high cost, the utility model provides a cross-river aqueduct diversion cofferdam that can meet the overall construction space of the aqueduct, improve the safety during the construction process, is conducive to promoting the overall construction progress and reduces the total construction cost.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A river-crossing aqueduct diversion cofferdam comprises a downstream cofferdam, an upstream cofferdam and a turning platform, wherein one end of the downstream cofferdam and the upstream cofferdam are respectively connected to a shore walkway on one side, and the other end is connected through the turning platform, so that the downstream cofferdam, the upstream cofferdam, the turning platform and the shore walkway form a cross-river operation transportation network; underwater dumping area I is respectively arranged on the backwater side of the downstream cofferdam and the upstream cofferdam, and underwater dumping area II is respectively arranged on the frontwater side, and an integral anti-seepage wall is respectively built between the underwater dumping area I and the underwater dumping area II of the downstream cofferdam and the upstream cofferdam, and the integral anti-seepage wall comprises a clay core groove and a clay core wall which are sequentially arranged from bottom to top, the clay core groove is formed by digging out a riverbed permeable layer and replacing it with clay, and the clay core wall is formed by compacting the clay.

[0006] Furthermore, a filling area III is set on the top of the underwater dumping area I, the underwater dumping area II and the clay core wall. The filling area IV is at the same height as the flood control design water level, and forms an operation channel network with the turning platform and the shore access road.

[0007] Furthermore, the underwater dumping and filling area I, underwater dumping and filling area II and filling area III are respectively formed by filling with mountain stones.

[0008] Furthermore, the water-facing surfaces of the downstream cofferdam and the upstream cofferdam are filled with stone foot protection and stone slope protection in sequence from bottom to top.

[0009] Furthermore, the heights of the underwater dumping area I, the underwater dumping area II and the overall anti-seepage wall are at least 1 meter higher than the river water level.

[0010] Furthermore, the underwater dumping and filling area I, underwater dumping and filling area II, and block stone footing are directly arranged on the top surface of the riverbed.

[0011] Furthermore, an open diversion channel is arranged outside the turning platform, a waterproof geomembrane is laid on the entire section of the open diversion channel, and wire mesh gabions are laid on the waterproof geomembrane.

[0012] Furthermore, the top width of the underwater dumping zone I is not less than 5m, and the top of the underwater dumping zone I serves as a working platform for filling the clay core trench and the clay core wall.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model combines the upstream and downstream cofferdams, turning platforms and shore walkways to form a cross-river operation traffic network, which can meet the construction operation needs such as equipment entry and exit and material transportation at the shore and beach, and also provides a larger working space for aqueduct construction, which can realize parallel construction and speed up the progress of aqueduct construction.

[0015] 2. The utility model fills the middle part of the upstream and downstream cofferdams with an integral anti-seepage wall, which has a strong waterproof effect and provides a dry working environment for the construction of aqueduct piers, which is beneficial to improving the safety during the construction process and promoting the overall construction progress.

[0016] 3. The utility model has a strong diversion capacity and has a variety of flood prevention emergency measures, so the loss in case of flood is relatively small.

[0017] Fourth, the utility model mainly adopts mountain stone soil and clay filling, and the construction cost is relatively low.

[0018] 5. The diversion cofferdam of the utility model provides a larger working space for the construction of aqueduct piers. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a plan view of a diversion cofferdam for a river-crossing aqueduct of the utility model.

[0021] Figure 2It is a cross-sectional schematic diagram of an upstream cofferdam or a downstream cofferdam of a river-crossing aqueduct diversion cofferdam of the utility model.

[0022] Figure 3 The utility model is a cross-sectional schematic diagram of a diversion open channel of a diversion cofferdam of a river-spanning aqueduct.

[0023] Figure 4 The utility model is a cross-sectional schematic diagram of a turning platform of a diversion cofferdam of a river-crossing aqueduct.

[0024] In the figure: 1. Downstream cofferdam; 2. Upstream cofferdam; 3. Diversion open channel; 4. Turning platform; 5. Access road under foundation pit; 6. Aqueduct piers; 7. Aqueduct body; 8. Access road on the shore; 9. Access road on the shore; 10. Existing road; 11. Underwater filling area I; 12. Clay core trough; 13. Clay core wall; 14. Underwater filling area II; 15. Filling area III; 16. Block stone foot protection; 17. Block stone slope protection; 18. Wire mesh gabion; 19. Waterproof geomembrane; 20. Flow channel. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1An embodiment of a cross-river aqueduct diversion cofferdam of the utility model comprises a diversion open channel 3, a downstream cofferdam 1, an upstream cofferdam 2 and a turning platform 4, one end of the downstream cofferdam 1 and the upstream cofferdam 2 are respectively connected to a shore walkway 9 on one side, and the other end is connected through the turning platform 4, so that the downstream cofferdam 1, the upstream cofferdam 2, the turning platform 4 and the shore walkway 9 form a cross-river operation transportation network, the diversion open channel 3 is arranged on the outer side of the turning platform 4 and the downstream cofferdam 1 and the upstream cofferdam 2, and the downstream cofferdam 1, the upstream cofferdam 2, the diversion open channel 3 and the turning platform 4 form a complete diversion system.

[0029] See also Figure 2 , the downstream cofferdam 1 includes the underwater dumping of mountain skin stone area I 11, clay core groove 12, clay core wall 13, underwater dumping of mountain skin stone area II 14, mountain skin stone filling area III 15, block stone slope protection 14, block stone foot protection 16. The mountain skin stone dumping area I 11 is occupied from the beach along the longitudinal direction of the cofferdam in one direction, and the filling materials are unloaded to the end of the embankment, and then pushed from the end of the embankment to the water surface by a bulldozer. The filling elevation of the underwater dumping of mountain skin stone area I 11 is 1m higher than the current water level, so as to build it as a temporary working channel. The underwater dumping of mountain skin stone area I 11 needs to be filled and compacted to a top width of 5m according to the designed line shape and cross-sectional size, so as to provide an operating platform for filling the clay core groove 12 and the clay core wall 13. The clay core groove 12 is formed by removing the riverbed gravel layer (permeable layer) with a long-arm excavator and backfilling with clay to prevent the permeable layer of the riverbed from seepage. The clay core wall 13 is layered and filled along the water-facing surface of the completed hillstone dumping area Ⅰ 11, and connected with the clay core groove 12 to form an integral anti-seepage wall. The hillstone dumping area Ⅱ 14 is layered and filled and rolled along the water-facing surface of the completed clay core wall 13, so that the clay core wall 13 and the clay core groove 12 cannot directly contact the water flow, and prevent the clay core wall 13 and the clay core groove 12 from losing their anti-seepage function due to water scouring. The hillstone filling area Ⅲ 15 is layered and rolled to the flood control design water level, and is connected with the turning platform 4 and the beach access road 9 to form an operation channel network. The block stone slope protection 14 and the block stone foot protection 16 are filled on the water-facing surface of the mountain stone dumping area II 14 and the mountain stone filling area III 15, and are filled to the elevation of the top of the cofferdam to prevent the mountain stone underwater dumping area II 14 from being eroded and slipped by the water flow, thereby strengthening the anti-erosion ability of the cofferdam.

[0030] The structure of the upstream cofferdam 2 is the same as that of the downstream cofferdam 1 .

[0031] See also Figure 3, the diversion open channel 3 includes a flow channel 20, a waterproof geomembrane 19, and a wire gabion 18. The maximum excavation depth of the diversion open channel is 7.7m, which exceeds the maximum excavation depth of an ordinary excavator, so a layered excavation method is adopted, that is, the first layer is excavated from the ground to a depth of 2.5m and the corresponding slope excavation is completed; the second layer is excavated to a depth of 2.5m, and the corresponding slope excavation is completed; the third layer is excavated to the bottom of the channel, and after the channel excavation is completed, a waterproof geomembrane 19 is laid on the entire section, and wire gabions 18 are stacked on the entire section in the flow channel 20. While the diversion open channel 3 is excavated in layers, it is excavated from the middle to both sides, and the original bank slope is reserved at the inlet and outlet of the diversion open channel 3. Before the downstream cofferdam 1 is closed, the original bank slope at the inlet and outlet of the diversion open channel 3 is opened. During excavation, precipitation measures should be taken to prevent the channel bottom from being soaked by water, and settlement and displacement observations should be made in the foundation pit and on the top of the foundation pit.

[0032] See also Figure 4 The structure of the turning platform 4 is similar to that of the downstream cofferdam 1, except that the cross-sections of the clay core groove 12 and the clay core wall 13 are inverted trapezoidal.

[0033] The above is only a specific implementation scheme of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the field can make many possible changes and modifications to the technical scheme of the utility model by using the technical content disclosed above without departing from the scope of the technical scheme of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical scheme of the utility model shall fall within the protection scope of the technical scheme of the utility model.

Claims

1. A river-crossing aqueduct diversion cofferdam, comprising a downstream cofferdam, an upstream cofferdam and a turning platform, characterized in that: One end of the downstream cofferdam and the upstream cofferdam are respectively connected to a shore walkway on one side, and the other end is connected through the turning platform, so that the downstream cofferdam, the upstream cofferdam, the turning platform and the shore walkway form a cross-river operation traffic network; Underwater dumping area I is respectively arranged on the backwater side of the downstream cofferdam and the upstream cofferdam, and underwater dumping area II is respectively arranged on the frontwater side. An integral anti-seepage wall is respectively built between the underwater dumping area I and the underwater dumping area II of the downstream cofferdam and the upstream cofferdam. The integral anti-seepage wall comprises a clay core groove and a clay core wall which are arranged in sequence from bottom to top. The clay core groove is formed by excavating the permeable layer of the riverbed and replacing it with clay, and the clay core wall is formed by compacting the clay.

2. The river-crossing aqueduct diversion cofferdam according to claim 1, characterized in that: A filling area III is set on the top of the underwater dumping area I, the underwater dumping area II and the clay core wall. The filling area III is at the same height as the flood control design water level, and forms an operation channel network with the turning platform and the shore access road.

3. The river-crossing aqueduct diversion cofferdam according to claim 2, characterized in that: The underwater dumping and filling area I, underwater dumping and filling area II and filling area III are respectively formed by filling with mountain stones.

4. The river-crossing aqueduct diversion cofferdam according to claim 1, characterized in that: The water-facing surfaces of the downstream cofferdam and the upstream cofferdam are filled with stone foot protection and stone slope protection in sequence from bottom to top.

5. The river-crossing aqueduct diversion cofferdam according to claim 1, characterized in that: The heights of the underwater dump fill area I, underwater dump fill area III and the overall anti-seepage wall are at least 1 meter higher than the river water level.

6. The river-crossing aqueduct diversion cofferdam according to claim 4, characterized in that: The underwater dumping and filling area I, underwater dumping and filling area II, and block stone footing are directly arranged on the top surface of the riverbed.

7. The river-crossing aqueduct diversion cofferdam according to any one of claims 1 to 6, characterized in that: An open diversion channel is arranged outside the turning platform, a waterproof geomembrane is laid on the entire section of the open diversion channel, and wire mesh gabions are laid on the waterproof geomembrane.

8. The river-crossing aqueduct diversion cofferdam according to any one of claims 1 to 6, characterized in that: The top width of the underwater dumping area I is not less than 5m, and the top of the underwater dumping area I serves as a working platform for filling the clay core trench and the clay core wall.

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