A cofferdam structure for sewer network connection

Abstract

The utility model discloses a cofferdam structure for drainage pipe network connection, including cofferdam, waterstop rubber strip, a plurality of adjustable support, a plurality of inner support: the utility model has the advantages of: zero pipe network interference: through the local enclosure of cofferdam, creates the operation space under the premise of not influencing the main pipe network overcurrent smooth, fundamentally avoids the upstream waterlogging problem caused by construction. High operation safety: without upstream plugging, eliminates the safety hidden danger such as air bag rush open, provides stable physical isolation space for well construction personnel. Construction cost is reduced significantly: the small enclosure space only needs to guide and discharge limited residual water, uses small -size water pump short -time operation, and the equipment and energy consumption cost are saved greatly. Connection quality is reliable: realizes the truly waterless dry operation environment, facilitates accurate alignment and sealing construction of pipeline interface, effectively guarantees the interface quality, reduces the later leakage risk well.

Description

Technical Field

[0001] This utility model relates to the technical field of municipal drainage pipe network construction equipment, and in particular to a cofferdam structure for connecting drainage pipe networks. Background Technology

[0002] In the construction of connecting new municipal drainage pipelines to existing main drainage networks, the existing main networks generally have the characteristics of "large daily water flow and inability to be temporarily sealed off." Traditional connection construction methods have the following core defects: Significant impact on pipeline network: If the existing pipeline network is temporarily blocked to create working space, it will lead to poor drainage upstream of the pipeline network, water accumulation and flooding, which will seriously affect the normal function of the pipeline network; High safety risks: If airbags are used to temporarily seal the upstream pipeline, the airbags may be blown open due to excessive pressure from the upstream water, posing a great safety hazard to construction workers working inside the well.

[0003] Low cost efficiency: It requires continuous use of high-power water pumps for drainage or well point dewatering, resulting in high equipment rental and energy costs. Furthermore, the drainage effect is unstable due to fluctuations in pipeline flow, and it is easy to be forced to operate with water. Poor work quality: Sealing the pipe joints during water connection is difficult and prone to problems such as leakage and failure to pass the water tightness test, which increases the cost of later operation and maintenance.

[0004] Therefore, it is necessary to develop a cofferdam structure for connecting to drainage pipe networks to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to design a cofferdam structure for connecting drainage pipe networks in order to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions: A cofferdam structure for connecting drainage pipe networks, used for connecting pipes on the sidewall of inspection wells, the cofferdam structure includes: Cofferdam; The cofferdam is formed as a semi-tubular structure with a semi-circular cross-section, and its rectangular sides and top are open; The top of the cofferdam is higher than the water level in the inspection well. Water-stop strip; the rectangular side edge of the cofferdam is attached to the inner wall of the inspection well, forming a local working space between the inner side of the cofferdam and the first side wall of the inspection well, and the connection on the inspection well is located within the local working space; the water-stop strip is set between the rectangular side edge of the cofferdam and the first side wall of the inspection well. Multiple adjustable supports; the first end of the multiple adjustable supports is supported on the outer wall of the cofferdam, and the second end of the multiple adjustable supports is supported on the inner wall of the inspection well.

[0007] Furthermore, the cofferdam structure also includes multiple internal supports, which include arc-shaped rods and connecting rods. Both the arc-shaped rods and connecting rods are horizontally arranged. The arc-shaped rods are attached to the inner side of the arc-shaped side of the cofferdam, and the two ends of the connecting rods are connected to the two ends of the arc-shaped rods.

[0008] Furthermore, the internal support also includes a support rod, the first end of which is connected to the middle of the connecting rod, and the second end of which is connected to the middle of the arc-shaped rod.

[0009] Preferably, the multiple internal supports are parallel to each other and are evenly installed in the vertical direction within the cofferdam.

[0010] Furthermore, the cofferdam structure also includes multiple lifting lugs, which are installed at the top of the cofferdam.

[0011] Furthermore, the first ends of the multiple adjustable supports are supported on the vertical dividing centerline of the cofferdam, and the second ends of the multiple adjustable supports are supported on the second sidewall of the inspection well, which is the opposite sidewall of the first sidewall.

[0012] Preferably, multiple adjustable supports are arranged in parallel to each other, and the multiple adjustable supports are evenly installed along the vertical direction on the outer side of the arc-shaped side of the cofferdam.

[0013] Preferably, the adjustable support is a threaded rod jacking structure, a hydraulic jack, or a wedge block jacking structure.

[0014] The beneficial effects of this utility model are as follows: Zero pipeline interference: By partially enclosing the main pipeline, the construction space is created without affecting the smooth flow of the main pipeline, thus fundamentally avoiding the problem of upstream water accumulation and flooding caused by construction.

[0015] High operational safety: No upstream sealing is required, eliminating safety hazards such as airbag rupture and providing a stable physical isolation space for construction personnel inside the well.

[0016] Construction costs are significantly reduced: the enclosed space is small, only a limited amount of residual water needs to be drained, and a small water pump can be used for short-term operation, which greatly saves equipment and energy costs.

[0017] Reliable connection quality: It realizes a truly waterless dry working environment, which facilitates the precise alignment and sealing of pipe interfaces, effectively ensuring the quality of the interfaces and reducing the risk of leakage later.

[0018] Stable structure and strong adaptability: The combination of built-in reinforced internal support and external adjustable support ensures the stability of the cofferdam under the impact of water flow. The adjustable support design allows this application to adapt to inspection wells of different sizes. Attached Figure Description

[0019] Figure 1This is a top view of the structure of this utility model; Figure 2 This is a schematic diagram of the main structure of this utility model; The corresponding figure labels are: In the diagram: 1-cofferdam, 2-internal support, 3-adjustable support, 4-waterstop strip, 5-lifting lug, 6-connecting pipe, 7-inspection well. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0027] like Figure 1 and 2 As shown, a cofferdam structure for connecting to a drainage network is used for connecting pipes 6 on the side wall of a manhole 7. The cofferdam structure includes: Cofferdam 1; Cofferdam 1 is formed as a semi-tubular structure with a semi-circular cross-section, and the rectangular sides and top surface of cofferdam 1 are open; the top height of cofferdam 1 is higher than the water level in inspection well 7; Water-stopping strip 4; The rectangular side edge of the cofferdam 1 is attached to the inner wall of the inspection well 7, forming a local working space between the inner side of the cofferdam 1 and the first side wall of the inspection well 7, and the connection on the inspection well 7 is located within the local working space; the water-stopping strip 4 is set between the rectangular side edge of the cofferdam 1 and the first side wall of the inspection well 7. Three adjustable supports 3; the first end of the three adjustable supports 3 is supported on the outer wall of the cofferdam 1, and the second end of the three adjustable supports 3 is supported on the inner wall of the inspection well 7.

[0028] Three internal supports 2; each internal support 2 includes an arc-shaped rod, a connecting rod, and a support rod. The arc-shaped rod and the connecting rod are both horizontally arranged. The arc-shaped rod is attached to the inner side of the arc-shaped side of the cofferdam 1, and the two ends of the connecting rod are connected to the two ends of the arc-shaped rod. The first end of the support rod is connected to the middle of the connecting rod, and the second end of the support rod is connected to the middle of the arc-shaped rod. The purpose of setting up the internal supports 2 is to increase the structural rigidity of the cofferdam 1. Two lifting lugs 5; the lifting lugs 5 are installed at the top of the cofferdam 1.

[0029] In some embodiments, the three inner supports 2 are parallel to each other and are evenly installed in the vertical direction within the cofferdam 1, respectively placed inside the top, middle and bottom of the cofferdam 1.

[0030] In some embodiments, the first ends of the three adjustable supports 3 are supported on the vertical dividing centerline of the cofferdam 1, and the second ends of the three adjustable supports 3 are supported on the second sidewall of the inspection well 7, which is the opposite sidewall of the first sidewall. The three adjustable supports 3 are arranged parallel to each other and are evenly installed vertically on the outer side of the arcuate side of the cofferdam 1.

[0031] In some other embodiments, multiple adjustable supports 3 can be set at the same height of the cofferdam 1. The multiple adjustable supports 3 are evenly supported on the outer wall of the cofferdam 1, and the second end of the adjustable support 3 can be supported on the inner wall of the well sidewall as needed.

[0032] In some embodiments, the adjustable support 3 is a threaded rod jacking structure, a hydraulic jack, or a wedge block jacking structure.

[0033] In some embodiments, the cofferdam 1 is a steel cofferdam, so its curvature can be adjusted to a certain extent. Only by adjusting the length of the adjustable support 3, the cofferdam can be tightened and deformed by compression, so as to adjust the curvature of the cofferdam and ultimately adapt to the connection of inspection wells of different sizes or connection of pipelines 6 in different locations.

[0034] In some embodiments, the cofferdam 1 is formed by rolling or splicing steel plates of a preset thickness (e.g., 10 mm) to form an approximately semi-cylindrical shell structure, the bottom of which is welded and closed by steel plates of the same material, together forming a semi-closed enclosure with an open opening; the inner support 2 is an arc-shaped support structure welded from short pipes, the curvature of which matches the inner wall of the cofferdam, used to enhance the overall structural rigidity of the cofferdam, resist the lateral impact of the pipe network water flow, and prevent deformation; one end of the adjustable support 3 is hinged or fixed to the main body of the cofferdam, and the other end can be pressed against the inner wall of the inspection well 7, used to adjust and fix the position of the cofferdam, and press the water-stopping strip 4 to enhance the sealing effect; the lifting lugs 5 are welded and fixed to the top of the cofferdam 1, and there are at least two of them, used for the underground hoisting, positioning and subsequent dismantling of the cofferdam.

[0035] During installation, the following steps are taken: First, the main body 1 of the cofferdam is fabricated according to the dimensions of the target manhole 7. Then, a water-stopping strip 4 is fixedly installed at its edge that contacts the inner wall of the manhole 7 using adhesive or a mechanical pressure strip. The water-stopping strip 4 is preferably made of water-resistant, highly elastic rubber or silicone material, and its cross-sectional shape can be designed according to sealing requirements.

[0036] Subsequently, using the lifting lugs 5 welded to the cofferdam, the assembled cofferdam was hoisted into the inspection well 7 using lifting equipment. It was then placed near the well wall on the side where the connecting pipeline 6 would be connected.

[0037] Then, adjust the adjustable supports 3 (e.g., rotating threaded rods) installed on the outside of the cofferdam 1 in sequence, so that their ends are firmly pressed against the second side wall of the inspection well 7 and the outer side wall of the cofferdam 1. This process must ensure that the water-stopping strip 4 is evenly compacted to form a tight, flexible sealing interface with the well wall.

[0038] Next, since the bottom of the cofferdam has been sealed and the enclosed space has been isolated from the main pipeline water flow, only a small amount of residual water remains inside. At this point, a small water pump can be used to quickly drain the water from the sealed space, thus creating a dry and safe working environment.

[0039] Finally, construction workers can then carry out subsequent work within this waterless space, such as perforating the manhole wall, inserting connecting pipes, and sealing the joints (e.g., using cement mortar, waterproof rubber rings, or quick-sealing materials). During the operation, water from the existing drainage network can flow normally through the unenclosed portion of the manhole, without affecting urban drainage.

[0040] This invention achieves waterless connection through a synergistic mechanism of "partial enclosure and isolation, flexible sealing and water stoppage, structural reinforcement and impact resistance, and efficient drainage in a small space." The cofferdam 1 forms a locally dry zone within the well, while the water-stopping strip 4 and adjustable support 3 jointly block external seepage. The internal support 2 ensures the structure does not deform under water flow impact, and the minimal working surface allows for rapid and economical drainage. Ultimately, it provides a high-quality construction interface for pipeline connection without interrupting water supply or lowering water levels.

[0041] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A cofferdam structure for connecting drainage pipe networks, used for connecting pipes (6) on the side wall of a manhole (7), characterized in that, The cofferdam structure includes: Cofferdam (1); the cofferdam (1) is formed as a semi-circular semi-tubular structure with an open rectangular side and top surface; the top height of the cofferdam (1) is higher than the water level in the inspection well (7); Water-stop strip (4); The rectangular side edge of the cofferdam (1) is attached to the inner wall of the inspection well (7), forming a local working space between the inner side of the cofferdam (1) and the first side wall of the inspection well (7), and the connection on the inspection well (7) is located within the local working space; the water-stop strip (4) is set between the rectangular side edge of the cofferdam (1) and the first side wall of the inspection well (7); Multiple adjustable supports (3); the first end of the multiple adjustable supports (3) is supported on the outer wall of the cofferdam (1), and the second end of the multiple adjustable supports (3) is supported on the inner wall of the inspection well (7).

2. The cofferdam structure for connecting to a drainage pipe network according to claim 1, characterized in that, The steel cofferdam also includes multiple internal supports (2). The internal supports (2) include arc rods and connecting rods. Both the arc rods and connecting rods are set horizontally. The arc rods are attached to the inner side of the arc side of the cofferdam (1), and the two ends of the connecting rods are connected to the two ends of the arc rods.

3. A cofferdam structure for connecting to a drainage pipe network according to claim 2, characterized in that, The inner support (2) also includes a support rod, the first end of which is connected to the middle of the connecting rod, and the second end of which is connected to the middle of the arc-shaped rod.

4. A cofferdam structure for connecting to a drainage pipe network according to claim 2, characterized in that, Multiple internal supports (2) are parallel to each other and are evenly installed in the vertical direction within the cofferdam (1).

5. A cofferdam structure for connecting to a drainage pipe network according to claim 1, characterized in that, The steel cofferdam also includes multiple lifting lugs (5), which are installed at the top of the cofferdam (1).

6. A cofferdam structure for connecting to a drainage pipe network according to claim 1, characterized in that, The first end of multiple adjustable supports (3) is supported on the vertical dividing centerline of the cofferdam (1), and the second end of multiple adjustable supports (3) is supported on the second side wall of the inspection well (7). The second side wall of the inspection well (7) is the opposite side wall of the first side wall.

7. A cofferdam structure for connecting to a drainage pipe network according to claim 6, characterized in that, Multiple adjustable supports (3) are set in parallel to each other, and multiple adjustable supports (3) are evenly installed in the vertical direction on the outer side of the arc-shaped side of the cofferdam (1).

8. A cofferdam structure for connecting to a drainage pipe network according to claim 7, characterized in that, The adjustable support (3) is a threaded rod jacking structure, a hydraulic jack or a wedge block jacking structure.

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