River-crossing buried pipe flow guide structure for reservoir area

Abstract

The utility model discloses a river-crossing buried pipe flow guide structure for a reservoir area, relates to the field of water conservancy projects, and aims to provide the river-crossing buried pipe flow guide structure for the reservoir area, which is convenient and quick to construct and low in risk. According to the technical scheme, the river-crossing buried pipe flow guide structure of the reservoir area comprises an upstream cofferdam and a downstream cofferdam which are both located between the two banks of a river, the whole cofferdam section or the local cofferdam section of the upstream cofferdam and the downstream cofferdam is of a permeable structure, and a foundation pit is formed between the upstream cofferdam and the downstream cofferdam. A buried pipe structure crossing a river is arranged in the foundation pit, the buried pipe structure comprises a pipeline foundation at the bottom of the foundation pit and pipe wrapping concrete located on the top face of the pipeline foundation, the pipe wrapping concrete is of a cast-in-place reinforced concrete structure, and at least one pipeline is arranged in the pipe wrapping concrete. The device is used for river-crossing pipe burying construction diversion of the reservoir area of the river reach where construction cannot be conducted in the dry period due to the limitation of the reservoir dispatching operation mode, and the flow of the river channel is large or narrow in the flood period.

Description

Technical Field

[0001] The utility model relates to the field of water conservancy projects, in particular to a river-crossing buried pipe diversion structure in a reservoir area. Background Art

[0002] Cofferdams are commonly used diversion structures in the construction process of cross-river buried pipes. Generally, cross-river buried pipes are constructed in dry seasons using cofferdams to protect the riverbed in stages, narrow the riverbed to discharge water, and realize dry land construction. In the dry season, affected by the water storage of the reservoir, the reservoir is basically maintained at a normal water storage level, the water level is high, and it is difficult to implement cross-river buried pipes; in the flood season, the reservoir water level drops to the flood limit water level, the water level in the reservoir is low, the flow of the river itself is large, and the construction risk is high. Due to the restrictions of reservoir scheduling, cross-river buried pipes in the reservoir area can only be constructed during the flood season. If two-stage cofferdams are used, although dry land construction of cross-river buried pipes can be guaranteed, the total length of the two-stage cofferdams is too long, the cofferdams occupy more flow sections of the main riverbed section, the cofferdam height is high, and the construction risk is high. At the same time, due to the large flow in the flood season, the construction time of the two-stage cofferdam is long, the construction risk is high, and it is not suitable for river sections with narrow riverbeds. Utility Model Content

[0003] The utility model aims to provide a reservoir area cross-river buried pipe diversion structure which is convenient and quick to construct and has low risk.

[0004] The technical solution adopted by the utility model is: a river-crossing buried pipe diversion structure in a reservoir area, comprising an upstream cofferdam and a downstream cofferdam both located between two banks of the river, the entire cofferdam section or a partial cofferdam section of the upstream cofferdam being a permeable structure, the entire cofferdam section or a partial cofferdam section of the downstream cofferdam being a permeable structure, a foundation pit being provided between the upstream cofferdam and the downstream cofferdam, a buried pipe structure crossing the river being provided in the foundation pit, the buried pipe structure comprising a pipeline foundation at the bottom of the foundation pit and pipe-wrapped concrete located on the top surface of the pipeline foundation, the pipe-wrapped concrete comprising an underwater section located in the foundation pit and exposed sections located on both banks of the river, the pipe-wrapped concrete being a cast-in-place reinforced concrete structure, and at least one pipe being provided inside the pipe-wrapped concrete.

[0005] Considering that river water is often concentrated in the middle of the riverbed, in order to shorten the construction period, the upstream cofferdam and the downstream cofferdam are divided into three sections, namely the riverbed section and the left bank section and the right bank section at both ends of the riverbed section. The left bank section and the right bank section are impermeable structures, and the riverbed section is a permeable structure. Specifically: the left bank section and the right bank section are filled with earth and stone, and the riverbed section is filled with block stones. The upstream cofferdam and the downstream cofferdam are in a shape of large at the bottom and small at the top in the vertical section along the river direction, and the riverbed section is in a trapezoidal shape of small at the bottom and large at the top in the vertical section perpendicular to the river flow direction.

[0006] In order to cope with possible floods during the construction of cross-river buried pipes in the reservoir area during the flood season, further: the top elevations of the left bank section and the right bank section at both ends of the riverbed section are consistent, the top surface elevation of the riverbed section is lower than the top surface elevations of the left bank section and the right bank section at both ends, a connecting slope is provided between the top surface of the riverbed section and the top surfaces of the left bank section and the right bank section at both ends, the top surface elevation of the riverbed section corresponds to the flood level during the flood season, and a flow gap is formed on the top surface of the riverbed section.

[0007] The following provides a pipeline foundation with a simple structure and convenient construction. Specifically: the pipeline foundation includes a block stone layer replaced at the bottom of the foundation pit and a gravel cushion layer on the top of the block stone layer.

[0008] The tube-wrapped concrete is constructed by underwater cast-in-place construction. Specifically: formwork is provided on the upstream and downstream sides of the tube-wrapped concrete respectively. The block stone layer is a trapezoid with a larger bottom and a smaller top in the vertical section along the river direction. The upstream side of the block stone layer and the gravel cushion layer is the upstream slope protection formed by the flow of concrete, and the downstream side of the block stone layer and the gravel cushion layer is the downstream slope protection formed by the flow of concrete.

[0009] The upstream slope protection and the downstream slope protection are naturally formed during the pouring of the tube-wrapped concrete. Specifically, the slopes of the upstream slope protection and the downstream slope protection are both 1:5.

[0010] In order to reduce the scouring effect of river water on the pipe-wrapped concrete and ensure the safe operation of the pipeline, an upstream foot guard is provided between the upstream side of the pipe-wrapped concrete and the upstream slope protection, and a downstream foot guard is provided between the downstream side of the pipe-wrapped concrete and the downstream slope protection. Specifically, the upstream foot guard and the downstream foot guard are both block stones.

[0011] In order to ensure the effectiveness of the upstream foot guard and the downstream foot guard, it is further provided that the top surfaces of the upstream foot guard and the downstream foot guard are flush with the top surface of the pipe-wrapped concrete.

[0012] The beneficial effects of the utility model are as follows: the cross-river buried pipe diversion structure in the reservoir area does not have a longitudinal cofferdam extending along the river flow direction, the length and height of the upstream cofferdam and the downstream cofferdam are reduced relative to the longitudinal cofferdam, and there is no need to construct the longitudinal cofferdam in stages, nor is there any need to drain the foundation pit, which reduces the amount of engineering work. The upstream cofferdam and the downstream cofferdam both adopt a permeable structure, which can buffer the water flow in the foundation pit. The foundation pit is basically in a static water state, and the construction of the buried pipe structure can be realized, including the underwater pouring of the pipe-wrapped concrete. The utility model can quickly complete the cross-river buried pipe construction in the reservoir area within about 15 days during the flood season, and the cross-river buried pipe construction time is short and the construction risk is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a schematic diagram of the plan layout of an embodiment of a reservoir area cross-river buried pipe diversion structure.

[0014] Figure 2 yes Figure 1 Schematic diagram of the upstream cofferdam 1 in a vertical section perpendicular to the river flow direction.

[0015] Figure 3 yes Figure 1 Schematic diagram of a vertical section along the river.

[0016] Figure 4 Figure 3 Enlarged view of the buried pipe structure.

[0017] Reference numerals: upstream cofferdam 1, left bank section 11, riverbed section 12, right bank section 13, downstream cofferdam 2, buried pipe structure 3, pipe-wrapped concrete 31, pipeline 32, block stone layer 33, gravel cushion layer 34, upstream slope protection 35, downstream slope protection 36, upstream foot protection 37, downstream foot protection 38; flood level h1 during flood season, normal water storage level h2; Figure 1 The arrow in the figure indicates the direction of water flow. DETAILED DESCRIPTION

[0018] The utility model is suitable for cross-river buried pipe construction in reservoir areas where the operation mode is restricted by the reservoir scheduling operation mode, water is stored in the dry season and construction cannot be carried out in the dry season, and the reservoir capacity is vacated in the flood season to maintain the flood limit water level. It is suitable for river sections with large flow or narrow river channels during the flood season.

[0019] like Figure 1As shown, the utility model reservoir reservoir cross-river buried pipe diversion structure includes an upstream cofferdam 1 and a downstream cofferdam 2, both located between the two banks of the river. The entire cofferdam section or a partial cofferdam section of the upstream cofferdam 1 is a permeable structure, and the entire cofferdam section or a partial cofferdam section of the downstream cofferdam 2 is a permeable structure. The permeable structure means that the corresponding cofferdam section has a water flow channel, for example, the cofferdam section is filled with blocks of stone. The top surface elevation of the upstream cofferdam 1 and the top surface elevation of the downstream cofferdam 2 are both lower than the elevation corresponding to the normal water storage level h2, and are both higher than the elevation corresponding to the flood level h1 during the flood season. The river water can flow through the cofferdam section of the upstream cofferdam 1 which is a permeable structure, and can also flow through the cofferdam section of the downstream cofferdam 2 which is a permeable structure. The upstream cofferdam 1 and the downstream cofferdam 2 are both divided into three sections, namely the riverbed section 12 and the left bank section 11 and the right bank section 13 at both ends of the riverbed section 12. Considering that river water is often concentrated in the middle of the riverbed, the construction requirements can be met if only the cofferdam section corresponding to the riverbed section 12 is a permeable structure. At this time, the left bank section 11 and the right bank section 13 are impermeable structures, and the riverbed section 12 is a permeable structure. The impermeable structure means that the corresponding cofferdam section does not have a water flow channel, and the cofferdam section is a dense structure. For example, the left bank section 11 and the right bank section 13 are both filled with earth and stone. The left bank section 11 and the right bank section 13 are impermeable structures and can be constructed in advance without occupying the construction period of cross-river buried pipes. There is a gap between the left bank section 11 and the right bank section 13 for the construction of the riverbed section 12. Before the construction of the riverbed section 12, floods during the flood season can temporarily flow through the gap between the left bank section 11 and the right bank section 13, and the construction risk is relatively small. In order to ensure the stability of the upstream cofferdam 1 and the downstream cofferdam 2, the upstream cofferdam 1 and the downstream cofferdam 2 are in a shape of large at the bottom and small at the top in the vertical section along the river direction, such as Figure 3 The left bank section 11 and the right bank section 13 are constructed first and filled with earth and stone, and the riverbed section 12 is constructed later and filled with block stones. The riverbed section 12 is a trapezoidal shape with a small bottom and a large top in a vertical section perpendicular to the flow direction of the river, as shown in FIG. Figure 2 As shown. Whether it is the upstream cofferdam 1 or the downstream cofferdam 2, the top surface elevations of the riverbed section 12 and the left bank section 11 and the right bank section 13 at both ends can be consistent. For the flood that may occur during the construction of the cross-river buried pipe in the reservoir area during the flood season, it can overflow from the top of the upstream cofferdam 1 and the downstream cofferdam 2. In addition, in order to cope with the flood that may occur during the construction of the cross-river buried pipe in the reservoir area during the flood season, see Figure 2 Whether it is the upstream cofferdam 1 or the downstream cofferdam 2, the top elevations of the left bank section 11 and the right bank section 13 at both ends of the riverbed section 12 are consistent, and the top surface elevation of the riverbed section 12 is lower than the top surface elevations of the left bank section 11 and the right bank section 13 at both ends. A connecting slope is provided between the top surface of the riverbed section 12 and the top surfaces of the left bank section 11 and the right bank section 13 at both ends. The top surface elevation of the riverbed section 12 corresponds to the flood level h1 during the flood season, and a flow gap is formed on the top surface of the riverbed section 12, which is used for the passage of part of the flood.

[0020] There is a foundation pit between the upstream cofferdam 1 and the downstream cofferdam 2, and a buried pipe structure 3 is arranged in the foundation pit to cross the river. The upstream cofferdam 1 and the downstream cofferdam 2 can buffer the water flow in the foundation pit, and the foundation pit is basically in a static water state, which is conducive to the construction of the buried pipe structure 3, including the underwater pouring of the pipe-wrapped concrete 31. The buried pipe structure 3 includes a pipe foundation at the bottom of the foundation pit and a pipe-wrapped concrete 31 located on the top surface of the pipe foundation. At least one pipe 32 is arranged inside the pipe-wrapped concrete 31. The pipe 32 is generally a steel pipe, for example, Figure 3 and Figure 4 In the illustrated embodiment, there are two pipes 32, and both are round steel pipes. The pipe-wrapped concrete 31 includes an underwater section located in the foundation pit and exposed sections located on both sides of the river, and the underwater section is lower than the water level of the foundation pit. The following provides a pipeline foundation with a simple structure and convenient construction. The pipeline foundation includes a block stone layer 33 replaced at the bottom of the foundation pit and a gravel cushion layer 34 on the top of the block stone layer 33. The block stone layer 33 is replaced at the bottom of the foundation pit by rolling the block stones, and the top of the block stone layer 33 is a gravel cushion layer 34, which plays a role in leveling. The block stone layer 33 is a trapezoidal shape with a larger bottom and a smaller top in the vertical section along the river direction, such as Figure 4 As shown. The tube-wrapped concrete 31 is a cast-in-place reinforced concrete structure, which is constructed by underwater cast-in-place construction. Therefore, templates are provided on the upstream and downstream sides of the tube-wrapped concrete 31. In order to improve the bearing capacity of the pipeline foundation, the upstream side of the block stone layer 33 and the gravel cushion layer 34 is an upstream slope protection 35 formed by the flow of concrete, and the downstream side of the block stone layer 33 and the gravel cushion layer 34 is a downstream slope protection 36 formed by the flow of concrete. The gravel cushion layer 34 is constructed by underwater filling, so the flatness is relatively low. When pouring the tube-wrapped concrete 31, part of the concrete will sink from the gap between the template and the gravel cushion layer 34, and be cast into a whole with the gravel and block stones in the pipeline foundation, which effectively protects the tube-wrapped concrete 31 and improves the bearing capacity of the pipeline foundation. The upstream slope protection 35 and the downstream slope protection 36 are naturally formed during the pouring of the tube-wrapped concrete 31. The slopes of the upstream slope protection 35 and the downstream slope protection 36 are generally controlled according to the natural flow slope of 1:5. In order to reduce the scouring effect of river water on the pipe-wrapped concrete 31 and ensure the safety of the pipeline 32, an upstream foot guard 37 is provided between the upstream side of the pipe-wrapped concrete 31 and the upstream slope protection 35, and a downstream foot guard 38 is provided between the downstream side of the pipe-wrapped concrete 31 and the downstream slope protection 36. The upstream foot guard 37 and the downstream foot guard 38 are both blocks of stone and can be directly thrown in. In order to ensure the effectiveness of the upstream foot guard 37 and the downstream foot guard 38, the top surfaces of the upstream foot guard 37 and the downstream foot guard 38 are flush with the top surface of the pipe-wrapped concrete 31.

[0021] After the construction of the riverbed section 12 of the permeable structure of the upstream cofferdam 1 and the downstream cofferdam 2, the construction of the buried pipe structure 3 is completed quickly by selecting a period of time with less runoff during the flood season. The pipe 32, the steel cage of the pipe-wrapped concrete 31, and the upstream and downstream formwork are pre-welded and fixed on the top of the upstream cofferdam 1 or the downstream cofferdam 2. After the construction of the block stone layer 33 and the gravel cushion layer 34 of the pipe foundation is completed, the pipe 32, the steel cage of the pipe-wrapped concrete 31, and the upstream and downstream formwork are hoisted as a whole to the gravel cushion layer 34 by a car crane and an excavator, and then the concrete is poured. The pouring is carried out from one bank to the other bank, and the boom pump truck transports the water into the warehouse. The river water entering the warehouse is gradually discharged by the advancement of the concrete. The concrete is poured to the design elevation at one time. The underwater part of the concrete is not vibrated, and the small part exposed above the water on both sides is vibrated and compacted by an inserted vibrator.

Claims

1. A buried pipe diversion structure across a river in a reservoir area, characterized by: The invention comprises an upstream cofferdam (1) and a downstream cofferdam (2) both located between two banks of a river. The entire cofferdam section or a partial cofferdam section of the upstream cofferdam (1) is a water-permeable structure. The entire cofferdam section or a partial cofferdam section of the downstream cofferdam (2) is a water-permeable structure. A foundation pit is provided between the upstream cofferdam (1) and the downstream cofferdam (2). A buried pipe structure (3) is provided in the foundation pit and spans the river. The buried pipe structure (3) comprises a pipe foundation at the bottom of the foundation pit and a pipe-wrapped concrete (31) located on the top surface of the pipe foundation. The pipe-wrapped concrete (31) comprises an underwater section located in the foundation pit and exposed sections located on two banks of the river. The pipe-wrapped concrete (31) is a cast-in-place reinforced concrete structure. At least one pipe (32) is provided inside the pipe-wrapped concrete (31).

2. The reservoir cross-river buried pipe diversion structure according to claim 1, characterized in that: The upstream cofferdam (1) and the downstream cofferdam (2) are both divided into three sections, namely a riverbed section (12) and a left bank section (11) and a right bank section (13) at both ends of the riverbed section (12). The left bank section (11) and the right bank section (13) are impermeable structures, and the riverbed section (12) is a permeable structure.

3. The reservoir cross-river buried pipe diversion structure according to claim 2, characterized in that: The left bank section (11) and the right bank section (13) are both formed by earth and stone filling, and the riverbed section (12) is formed by block stone filling. The upstream cofferdam (1) and the downstream cofferdam (2) are shaped larger at the bottom and smaller at the top in a vertical section along the river direction, and the riverbed section (12) is shaped like a trapezoid with a smaller bottom and a larger top in a vertical section perpendicular to the river flow direction.

4. The reservoir cross-river buried pipe diversion structure according to claim 1, characterized in that: The top elevations of the left bank section (11) and the right bank section (13) at both ends of the riverbed section (12) are consistent, the top surface elevation of the riverbed section (12) is lower than the top surface elevations of the left bank section (11) and the right bank section (13) at both ends, a connecting slope is provided between the top surface of the riverbed section (12) and the top surfaces of the left bank section (11) and the right bank section (13) at both ends, the top surface elevation of the riverbed section (12) corresponds to the flood level (h1) during the flood season, and a flow gap is formed on the top surface of the riverbed section (12).

5. The reservoir cross-river buried pipe diversion structure according to any one of claims 1 to 4, characterized in that: The pipeline foundation comprises a block stone layer (33) filled at the bottom of the foundation pit and a sand and gravel cushion layer (34) on the top of the block stone layer (33).

6. The reservoir cross-river buried pipe diversion structure according to claim 5, characterized in that: Templates are provided on both the upstream and downstream sides of the tube-wrapped concrete (31), and the block stone layer (33) is in a trapezoidal shape with a larger bottom and a smaller top in a vertical section along the river direction. The upstream side of the block stone layer (33) and the gravel cushion layer (34) is an upstream slope protection (35) formed by the flow of concrete, and the downstream side of the block stone layer (33) and the gravel cushion layer (34) is a downstream slope protection (36) formed by the flow of concrete.

7. The reservoir cross-river buried pipe diversion structure according to claim 6, characterized in that: The slopes of the upstream slope protection (35) and the downstream slope protection (36) are both 1:

5.

8. The reservoir cross-river buried pipe diversion structure according to any one of claims 1 to 4, characterized in that: An upstream foot guard (37) is provided between the upstream side of the tube-wrapped concrete (31) and the upstream slope protection (35), and a downstream foot guard (38) is provided between the downstream side of the tube-wrapped concrete (31) and the downstream slope protection (36).

9. The reservoir cross-river buried pipe diversion structure according to claim 8, characterized in that: The upstream foot guard (37) and the downstream foot guard (38) are both made of block stones.

10. The reservoir cross-river buried pipe diversion structure according to claim 8, characterized in that: The top surfaces of the upstream foot guard (37) and the downstream foot guard (38) are flush with the top surface of the tube-wrapping concrete (31).

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