Cofferdam for construction of forebay of pump station without cutting off water

Abstract

The utility model discloses a cofferdam for construction of a forebay of a pump station without cutting off water, relates to the technical field of water stop cofferdams, and solves the problem that a steel cofferdam in the prior art is not applicable in a diversion tunnel construction environment of the forebay of the pump station due to limited waterproof capacity and limited loading capacity. The utility model comprises a C-shaped skeleton, the side edge and the bottom edge of the C-shaped skeleton are respectively provided with a sealing assembly, the outer side of the C-shaped skeleton is provided with an upstream panel, the top of the C-shaped skeleton is provided with a hoisting structure, and the inner side of the C-shaped skeleton is provided with a water suction pump. By arranging the C-shaped framework, the structural strength of the supporting part is improved, the upstream panel can be stably supported, only the upstream panel makes contact with the water surface, the stress effect is single, the overall design is in a C shape, and the water pressure bearing capacity is improved. Meanwhile, mounting and dismounting are facilitated by arranging a hoisting structure, water leaking into the inner side can be discharged by arranging a water suction pump, sealing can be conducted from the bottom and the side wall by arranging sealing assemblies on the side edge and the bottom edge of the C-shaped framework, and the waterproof capacity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water-stop cofferdams, in particular to a cofferdam for non-stop water construction of a pump station forebay. Background Art

[0002] The pump station forebay, also called the pre-adjustment pool, is normally located at the inlet of the pump station and is the first treatment facility of the pump station. The pump station forebay mainly removes impurities and suspended matters in water and reduces the fluctuation of sewage. The water intake and drainage of the pump station forebay are both realized through diversion tunnels for water conveyance. During the construction process, the upstream water continuously flows. Since the diversion tunnel needs to be constructed without stopping water, during the construction period of the diversion tunnel, a temporary cofferdam is required to block the water in the upstream direction in the area where the diversion tunnel is opened to prevent the water flow from directly impacting or spacingly affecting the construction area. The commonly used cofferdams for water-stop enclosure construction generally adopt self-weight sinking and grab mud sinking cofferdams. However, when the diversion tunnel of the pump station forebay is opened, the surrounding walls and the ground have already been poured, so the traditional cofferdams are no longer applicable.

[0003] For example, the Chinese invention patent with the publication number CN109778883A discloses a new type of steel cofferdam structure and installation method. The top crossbeam structure is supported and installed on the crossbeam adjusting mechanism for adjusting its position. The crossbeam adjusting mechanism is supported and installed inside the installation groove at the top of the dam body through the bottom plate foundation. A plurality of rows of parallel steel cofferdam box components are fixedly installed at the bottom of the top crossbeam structure. The outer walls of the plurality of groups of steel cofferdam box components are fixedly connected through spaced fixed beams; the inner walls of the steel cofferdam box components cooperate with the horizontal support beam structure; the horizontal support beam structure is fixedly installed on the side wall of the dam body of the dam; the bottom of the steel cofferdam box component is supported on the bottom horizontal support structure, and the bottom horizontal support structure is fixed at the bottom of the dam. This invention is installed under static water conditions, with reasonable structure, safe and reliable. When multiple holes are overhauled, a set of steel cofferdam can be reused repeatedly, and the economy is good.

[0004] This invention is only applicable to the overhaul situation of a dam with a hole. The cofferdam only needs to block the hole, but it is not applicable to the pump station forebay where the hole has not been opened yet, and the walls of the pump station forebay are mostly flat wall surfaces for construction. It cannot achieve a good waterproof effect, and at the same time, its structural strength is limited and it cannot be applied to the high water pressure environment with multi-directional water inflow. Content of the Utility Model

[0005] Aiming at the deficiencies in the above background art, the utility model provides a cofferdam for non-stop water construction of a pump station forebay, which solves the problem that the existing steel cofferdam is not applicable in the construction environment of the diversion tunnel of the pump station forebay due to limited waterproof ability and limited pressure-bearing ability.

[0006] The technical solution of the utility model is realized as follows: A cofferdam for construction without stopping water in the forebay of a pumping station, including a C-shaped framework. Sealing components are provided on the side and bottom of the C-shaped framework. A water-facing panel is provided on the outside of the C-shaped framework, a hoisting structure is provided on the top of the C-shaped framework, and a water pump is provided inside the C-shaped framework.

[0007] Preferably, the C-shaped framework includes a number of C-shaped crossbeams arranged at equal intervals. A V-shaped support beam is provided inside the C-shaped crossbeams, and adjacent C-shaped crossbeams are connected by columns.

[0008] Preferably, the C-shaped crossbeams, V-shaped support beams, and columns are all welded and connected by I-beam profiles. Both ends of the C-shaped crossbeams are respectively connected to the side edges. The water-facing panel is a C-shaped baffle, and the inside of the C-shaped baffle is welded and fixed to the C-shaped framework and columns.

[0009] Preferably, the sealing component includes a clamping groove fixedly provided on the side wall of the water-facing panel. The clamping groove is connected to a first foam sealing pad, and a pressing arm for pressing the other side of the first foam sealing pad is welded on the clamping groove.

[0010] Preferably, a pressing plate is provided between the side wall of the clamping groove and the first foam sealing pad, and a bolt for pressing against the pressing plate is threadedly connected to the clamping groove.

[0011] Preferably, the sealing component further includes a second foam sealing pad provided at the bottom of the water-facing panel. Both the first foam sealing pad and the second foam sealing pad are provided with one layer or multiple layers.

[0012] Preferably, the water pump is fixed inside the C-shaped framework through a support I. The water pump is connected to a water pipe, and the upper end of the water pipe is fixed to the top of the C-shaped framework through a support II. The nozzle of the water pipe faces the outside of the water-facing panel.

[0013] Preferably, the hoisting structure includes lifting rings symmetrically welded and fixed on the top of the C-shaped framework.

[0014] The beneficial effects of the utility model: By setting the C-shaped framework, the structural strength of the support part is improved, which can stably support the water-facing panel. Only the water-facing panel contacts the water surface, and the force is single. The overall C-shaped design can form an isolation space in the construction area that needs to be constructed, and at the same time improve the ability to bear multi-directional water pressure. At the same time, setting the hoisting structure is beneficial for installation and removal. Setting the water pump can drain the water leaking into the inner isolation space. By setting the sealing components on both the side and bottom of the C-shaped framework, sealing can be carried out from the bottom and side walls, improving the waterproof ability. Description of the Drawings

[0015] To more clearly illustrate the embodiments of the present utility model, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0016] Figure 1 Schematic diagram of the three-dimensional structure of the present utility model;

[0017] Figure 2 Schematic diagram of the bottom structure of the present utility model;

[0018] Figure 3 Schematic diagram of the enlarged structure of the present utility model;

[0019] In the figure: 1: C-shaped frame, 2: sealing assembly, 3: water-facing panel, 4: hoisting structure, 5: water pump, 6: C-shaped cross beam, 7: V-shaped support beam, 8: column, 9: edge rib, 10: card slot, 11: first foam sealing pad, 12: pressing plate, 13: second foam sealing pad, 14: water pipe, 15: support II, 20: pressing arm, 21: straight pad, 22: L-shaped pad. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0021] Such as Figure 1As shown in the figure, Embodiment 1 is a cofferdam for construction without stopping water in the forebay of a pumping station, which includes a C-shaped framework 1. Sealing components 2 are provided on both the side and the bottom of the C-shaped framework 1. The sealing components can seal from the bottom and the side walls, improving the waterproof ability. An upstream-facing panel 3 is provided outside the C-shaped framework 1, a hoisting structure 4 is provided at the top of the C-shaped framework 1, and a water pump 5 is provided inside the C-shaped framework 1. The temporary sluice in this embodiment is applied during the construction of a diversion tunnel opened on a dam or a wall. The main purpose is to block water and prevent the water body from directly impacting the dam during the process of opening the hole, which affects the construction safety and convenience. When in use, a crane is connected to the hoisting structure to lift the temporary sluice and place it on the ground on one side of the dam corresponding to the location where the diversion tunnel needs to be opened. Subsequently, the C-shaped framework is fixed to the wall or the dam. At the same time, the sealing components are used to seal between the bottom of the C-shaped framework and the ground, and between the side wall of the C-shaped framework and the side wall of the wall, forming an isolation space in the area where the diversion tunnel needs to be constructed. When long-term sealing results in water leakage through the gaps into the isolation space between the C-shaped framework and the wall, forming accumulated water, the water pump is used to drain the water. In this embodiment, by setting the C-shaped framework, the structural strength of the supporting part is improved, and it can firmly support the upstream-facing panel. Only the upstream-facing panel is in contact with the water surface, and the force acting is single. The overall design is C-shaped, and the ability to bear the water pressure is improved under the condition of receiving multi-directional water inflow.

[0022] Specifically, the C-shaped framework 1 includes a number of C-shaped cross beams 6 arranged at equal intervals. A V-shaped support beam 7 is provided inside the C-shaped cross beam 6. In this embodiment, the corner of the V-shaped support beam 7 is welded and fixed in the middle of the C-shaped cross beam, and both ends are welded and fixed to the middle parts of the two arms of the C-shaped cross beam respectively, thus forming a stable force-bearing support structure. Adjacent C-shaped cross beams 6 are connected by columns 8. In this embodiment, the C-shaped cross beam 6, the V-shaped support beam 7, and the column 8 are all welded and connected by I-beam profiles. In addition, both ends of the C-shaped cross beam 6 are respectively connected to side flanges 9. In this embodiment, the side flanges are channel steels. A total of two side flanges are provided, which are respectively connected to both ends of the C-shaped cross beam. During installation, expansion screws are used to connect and fix the side flanges 9 to the wall or the dam. The side flanges can provide a flat surface suitable for fitting and better fit with the wall or the dam. The lowermost C-shaped cross beam is directly in contact with the ground and is located on the ground by the self-weight of the sluice.

[0023] In this embodiment, the upstream-facing panel 3 is a C-shaped baffle. The inside of the C-shaped baffle is welded and fixed to the C-shaped framework 1 and the column 8. The C-shaped baffle is arranged to fit outside the C-shaped framework, forming a C-shaped water-blocking load-bearing surface, which is directly in contact with the water body and transmits the water pressure to the horizontally arranged C-shaped cross beam and the vertically arranged column, and finally transmits it to the wall or the dam through the side flanges.

[0024] Embodiment 2 is a cofferdam for construction without stopping water in the forebay of a pumping station. On the basis of Embodiment 1, as Figure 3As shown in the figure, the sealing assembly 2 includes a clamping groove 10 fixedly arranged on the side wall of the water-facing panel 3. The clamping groove 10 is connected to the first foam gasket 11, and a pressing arm 20 for pressing the other side of the first foam gasket 11 is welded on the clamping groove 10. In the use of this embodiment, one side of the first foam gasket is arranged in the clamping groove, and the other side is bent at 90° and attached to the side wall of the wall.

[0025] As a further implementation method, a pressing plate 12 is arranged between the side wall of the clamping groove 10 and the first foam gasket 11, and bolts for pressing against the pressing plate 12 are threadedly connected to the clamping groove 10. At least two bolts are provided. During installation, one side edge of the first foam gasket is arranged in the clamping groove and located between the pressing plate and the clamping groove, and the bolts are synchronously rotated. The bolts press against the first foam gasket, thereby realizing the fixation and pressing of the gasket.

[0026] In addition, in this embodiment, as Figure 2 shown, the sealing assembly 2 further includes a second foam gasket 13 arranged at the bottom of the water-facing panel 3. Both the first foam gasket 11 and the second foam gasket 13 are provided with one layer or multiple layers. In this embodiment, a total of two first foam gaskets are provided, including a straight gasket 21 and an L-shaped gasket 22. The straight gasket 21 and the L-shaped gasket 22 are stacked and arranged, and one side is pressed tightly in the clamping groove 10. During the installation process, the end of the straight gasket 21 directly abuts against the side wall of the wall, and the bent part of the L-shaped gasket is attached to the side wall of the wall and is pressed tightly against the wall by the clamping groove and the side of the pressing plate as the edge of the side wall is connected to the wall. A cylindrical thickened part is arranged on the side of the L-shaped gasket, which can achieve a tighter fit. The second foam gasket is a flat gasket integrally in a C shape, and cylindrical thickened parts are arranged on both sides of the flat gasket, respectively located on both sides of the C-shaped cross beam and the water-facing panel. During installation, the flat gasket is pressed on the ground by the gravity of the C-shaped cross beam and the water-facing panel to form a seal.

[0027] Embodiment 3, a cofferdam for the non-stop water construction of the forebay of a pumping station. On the basis of Embodiment 2, the water pump 5 is fixed inside the C-shaped framework 1 through the support I. The water pump 5 is connected to the water pipe 14. The upper end of the water pipe 14 is fixed to the top of the C-shaped framework 1 through the support II 15, and the nozzle of the water pipe 14 faces the outside of the water-facing panel 3. During use, the accumulated water that penetrates into the isolation space between the inside of the C-shaped framework and the wall or the accumulated water enclosed in the isolation space at the initial stage of installing the cofferdam is pumped out by the water pump and discharged to the outside of the sluice through the water pipe 14. Further, a hoop is arranged at the top of the support II for tightly fixing the upper end of the water pipe 14.

[0028] In addition, the hoisting structure 4 includes lifting rings symmetrically welded and fixed on the top of the C-shaped framework 1. In this embodiment, a total of four lifting rings are provided, which are respectively arranged on the C-shaped cross beams 6 on both sides. During installation, the lifting rings are directly connected to the lifting hook of the crane for hoisting.

[0029] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A cofferdam for the construction of a pump station forebay without water cut-off, characterized in that: The invention comprises a C-shaped frame (1), the side and bottom of the C-shaped frame (1) are both provided with sealing components (2), the outer side of the C-shaped frame (1) is provided with a water-facing panel (3), the top of the C-shaped frame (1) is provided with a hanging structure (4), and the inner side of the C-shaped frame (1) is provided with a water pump (5).

2. The non-stop water construction cofferdam for the pump station forebay according to claim 1 is characterized by: The C-shaped frame (1) comprises a plurality of C-shaped cross beams (6) arranged at equal intervals, a V-shaped support beam (7) is provided inside the C-shaped cross beams (6), and adjacent C-shaped cross beams (6) are connected via columns (8).

3. The non-stop water construction cofferdam for the pump station forebay according to claim 2 is characterized by: The C-shaped cross beam (6), the V-shaped support beam (7) and the column (8) are all connected by welding of I-shaped steel profiles.

4. The non-stop water construction cofferdam for the pump station forebay according to claim 3 is characterized by: Both ends of the C-shaped crossbeam (6) are respectively connected to the side ribs (9).

5. The non-stop water construction cofferdam for the pump station forebay according to claim 4 is characterized by: The water-facing panel (3) is a C-shaped baffle, and the inner side of the C-shaped baffle is welded and fixed to the C-shaped frame (1) and the column (8).

6. The non-stop water construction cofferdam for the pump station forebay according to any one of claims 1 to 5, characterized in that: The sealing assembly (2) comprises a clamping groove (10) fixedly arranged on the side wall of the water-facing panel (3), the clamping groove (10) being connected to one side of the first foam sealing pad (11), and a clamping arm (20) for clamping the other side of the first foam sealing pad (11) being welded to the clamping groove (10).

7. The non-stop water construction cofferdam for the pump station forebay according to claim 6 is characterized by: A clamping plate (12) is provided between the side wall of the clamping slot (10) and the first foam sealing pad (11), and a bolt for clamping the clamping plate (12) is threadedly connected to the clamping slot (10).

8. The non-stop water construction cofferdam for the pump station forebay according to claim 7 is characterized by: The sealing assembly (2) further comprises a second foam sealing pad (13) arranged at the bottom of the water-facing panel (3), and the first foam sealing pad (11) and the second foam sealing pad (13) are both provided with one or more layers.

9. The non-stop water construction cofferdam for the pump station forebay according to claim 8 is characterized by: The water pump (5) is fixed to the inner side of the C-shaped frame (1) via a bracket I. The water pump (5) is connected to a water pipe (14). The upper end of the water pipe (14) is fixed to the top of the C-shaped frame (1) via a bracket II (15). The mouth of the water pipe (14) faces the outside of the water-facing panel (3).

10. The non-stop water construction cofferdam for the pump station forebay according to claim 1 or 9, characterized in that: The lifting structure (4) comprises lifting rings symmetrically welded and fixed on the top of the C-shaped frame (1).

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