A precast anti-floating counterweight structure for a diversion tunnel water supply pipeline

Abstract

The utility model relates to water conservancy engineering technical field especially, relate to a water diversion tunnel water supply pipeline prefabricated anti -floating counterweight structure, including setting in water diversion tunnel's counterweight pier, pipeline, the counterweight pier closely water diversion tunnel's cave wall installation is installed, and the counterweight pier bottom is equipped with the mounting groove along water diversion tunnel axial direction, the pipeline sets up in the mounting groove, the mounting groove inner wall winding rubber sheet. The counterweight pier is prefabricated to facilitate the transportation and installation in the cave. The counterweight pier closely cave wall installation reduces water flow resistance, improves the stability of counterweight pier on PE pipeline. The mounting groove inner wall winding multilayer rubber sheet is used for reducing the abrasion to water supply pipeline. The utility model can solve the technical problem that the existing PE pipeline anti -floating measure has the poor economy, the big implementation difficulty, possibly pollutes the water flow in the cave. The utility model can solve the problem of underwater PE pipeline anti -floating in water diversion tunnel, and can solve the problem of transportation and installation anti -floating counterweight pier in narrow cave.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering technology, and in particular to a prefabricated anti-buoyancy counterweight structure for water supply pipelines in water diversion tunnels. Background Technology

[0002] In water conveyance projects, PE pipes are widely used due to their excellent material properties and performance, particularly in pipelines crossing water-bearing areas such as culverts, aqueducts, and tunnels. In the design and construction of water conveyance projects, to shorten the route length, reduce head loss, and lower construction difficulty, PE pipes are often laid along existing roads or water diversion tunnels. However, some water diversion tunnels are already in operation and cannot be shut off, making dry-laying of PE pipes unsuitable. Furthermore, the density of PE pipe is less than that of water. Without counterweighting, the connected PE pipes will float in existing water-bearing tunnels, causing instability such as slippage, resulting in project quality defects, wasting significant manpower and resources on rework, and increasing construction costs. Reducing the buoyancy of the water or adding counterweight to the PE pipes can mitigate the floating effect of PE pipes in water-bearing tunnels.

[0003] In existing technologies, commonly used anti-buoyancy measures for PE pipelines include installing elevated wells, vent pipes, anti-buoyancy piles, and anti-buoyancy counterweights within the water conveyance PE pipeline. Elevated wells can expel air from the PE pipeline, reducing its buoyancy, but they are generally expensive and uneconomical, and not suitable for use in tunnels. Vent pipes are more economical, but the limited space in tunnels makes implementation difficult and daily maintenance inconvenient. Anti-buoyancy piles counteract the buoyancy of the PE pipeline through frictional resistance in the soil and rock layers, but are difficult to implement in water diversion tunnels. Anti-buoyancy counterweights resist the buoyancy of the PE pipeline through the weight of the pier itself, and are mostly made of concrete and cast iron. Where burial depth is not required, anti-buoyancy counterweights are often cast in-situ using concrete. However, in already operational water diversion tunnels, casting counterweights in-situ would pollute the water flow within the tunnel and contaminate the drinking water of local residents.

[0004] Therefore, existing anti-buoyancy measures for PE pipelines have disadvantages such as poor economic efficiency, difficulty in implementation, and potential pollution of water flow inside tunnels. Utility Model Content

[0005] The purpose of this utility model is to provide a prefabricated anti-buoyancy counterweight structure for water supply pipelines in water diversion tunnels, which can solve the technical problems of existing PE pipeline anti-buoyancy measures, such as poor economic efficiency, high implementation difficulty, and potential pollution of water flow in the tunnel.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses a prefabricated anti-buoyancy counterweight structure for a water supply pipeline in a water diversion tunnel. It includes a counterweight pier and a pipeline installed inside the tunnel. The counterweight pier is installed flush against the tunnel wall, and an installation groove is provided at the bottom of the pier along the tunnel's axial direction. The pipeline is placed within the installation groove, and the inner wall of the groove is wrapped with rubber sheets. The counterweight pier is prefabricated to facilitate transportation and installation within the tunnel. The flush installation reduces water flow resistance and improves the stability of the counterweight pier on the PE pipeline. The multiple layers of rubber sheets wrapped around the inner wall of the installation groove reduce wear on the water supply pipeline. The rubber sheets act as a buffer layer, directly isolating the concrete from the pipeline surface and reducing frictional losses during installation and operation.

[0007] As a preferred embodiment, the top of the mounting groove is circular, and the groove entrance is shaped like a city gate. The city gate-shaped groove matches the shape of the pipe, avoiding rigid contact. This maintains the integrity of the pipe, prevents corrosion caused by damage to the anti-corrosion layer, and reduces pipe maintenance costs.

[0008] As a preferred embodiment, the counterweight pier is equipped with a lifting ring on top. This lifting ring facilitates handling and installation, allowing for easier manual transport within water-filled tunnels.

[0009] As a preferred embodiment, the counterweight pier is equipped with a connecting ring on its water-facing side. Multiple counterweight piers can be connected and fixed together via these side connecting rings, and the combined installation of multiple counterweight piers can effectively increase the anti-buoyancy capability.

[0010] Furthermore, multiple counterweight piers are installed along the axial direction of the water diversion tunnel, and these counterweight piers are sequentially arranged outside the pipeline.

[0011] Furthermore, multiple counterweight piers are installed radially along the water diversion tunnel, and these counterweight piers are connected by connecting rings.

[0012] As a preferred embodiment, the counterweight pier is equipped with reinforcing steel bars inside.

[0013] The beneficial effects of this utility model are: The prefabricated anti-buoyancy counterweight structure for a water supply pipeline in a water diversion tunnel provided by this utility model has the following advantages: First, the counterweight piers are prefabricated outside the tunnel to avoid contaminating the water flow inside the tunnel.

[0014] Secondly, the counterweight is installed close to the tunnel wall to reduce water flow resistance and improve the stability of the counterweight on the PE pipeline. During installation, the side of the counterweight without the connecting ring is pressed tightly against the tunnel wall, and the base surface is rectangular to increase the coefficient of friction. Installation close to the tunnel wall reduces the projected area of ​​the counterweight in the water flow, lowering the dynamic water load; the large contact area between the rectangular base surface and the tunnel wall, combined with the self-weight of the concrete, enhances the anti-slip ability. This improves the stability of the counterweight under long-term water flow, reduces maintenance requirements, and extends its service life.

[0015] Third, the weight of individual counterweight blocks was reduced, and their design was optimized to make them suitable for manual installation and transportation within narrow, water-bearing tunnels, thus lowering the difficulty of installing and transporting prefabricated counterweight blocks. The prefabricated concrete base was designed to be miniaturized and modular, and facilitated by lifting rings installed on the top of the counterweight blocks. The reduced weight of individual counterweight blocks made them easier to handle manually within narrow water diversion tunnels. The lifting rings, acting as fulcrums, directly reduced transportation difficulty and installation time, improving construction efficiency. This also reduced the need for large machinery, adapted to the space-constrained conditions within tunnels, and lowered labor costs and installation risks.

[0016] Fourth, the flexibility and reliability of anti-buoyancy capability are enhanced through modular installation. The connecting ring provides a modular connection interface, allowing multiple counterweight blocks to be installed axially or radially along the pipeline. This design allows for dynamic adjustment of the number of counterweight blocks according to actual buoyancy requirements, directly improving the adjustability of anti-buoyancy capability. It avoids the limitations of fixed counterweight design, can cope with different pipe diameters and flow conditions, reduces engineering changes and rework, and improves engineering economy and adaptability.

[0017] The structural optimization of prefabricated counterweight piers (such as lightweighting and modularization) directly solves the "polluted water flow" problem mentioned in the background technology, making it suitable for continuous water diversion tunnels. It achieves dry-site prefabrication and underwater installation, avoiding water pollution during construction, meeting environmental protection requirements, and improving construction safety. Therefore, this utility model can solve the technical problems of existing PE pipe anti-buoyancy measures, such as poor economic efficiency, high implementation difficulty, and potential pollution of water flow within the tunnel. This utility model can solve both the underwater buoyancy problem of PE pipes in water diversion tunnels and the problem of transporting and installing anti-buoyancy counterweight piers in narrow tunnels. Attached Figure Description

[0018] Figure 1 A partial three-dimensional schematic diagram of a prefabricated anti-buoyancy counterweight structure installed in a tunnel.

[0019] Figure 2 Front view of a prefabricated anti-buoyancy counterweight structure installed in a tunnel.

[0020] Figure 3 This is a front view of the prefabricated anti-buoyancy counterweight structure.

[0021] Figure 4 Left view of the prefabricated anti-buoyancy counterweight structure.

[0022] Explanation of reference numerals in the attached figures: 1-Counterweight block, 2-Lifting ring, 3-Connecting ring, 4-Rubber sheet, 5-Installation groove, 6-Cavity wall, 7-Pipeline, 8-Tunnel. Detailed Implementation

[0023] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Specifically, the terms "first position" and "second position" refer to two different positions.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] This utility model relates to a prefabricated anti-buoyancy counterweight structure for water supply pipelines in water diversion tunnels. To avoid contaminating the water flow within the tunnel by casting-in-place counterweights, thereby polluting the drinking water of local residents, this utility model requires the prefabrication of the counterweights. However, water diversion tunnels generally have small diameters, resulting in poor passage conditions when water is present. Counterweights can only be transported manually, necessitating optimized design for easier transport and installation within the tunnel. Therefore, this utility model proposes a prefabricated anti-buoyancy counterweight for water supply pipelines in water diversion tunnels. This counterweight can be used for anti-buoyancy of underwater PE pipelines in water diversion tunnels, solving the technical problems of poor economic efficiency, high implementation difficulty, and potential contamination of the water flow within the tunnel by existing anti-buoyancy measures for PE pipelines. The optimized counterweight effectively reduces the difficulty of its transportation and installation within the tunnel.

[0027] This utility model provides a prefabricated anti-buoyancy counterweight structure for a water supply pipeline in a water diversion tunnel, including a counterweight pier 1 and a pipeline 7 installed inside the water diversion tunnel 8. The counterweight pier 1 is installed close to the tunnel wall 6 of the water diversion tunnel 8. An installation groove 5 is provided at the bottom of the counterweight pier 1 along the axial direction of the water diversion tunnel 8. The pipeline 7 is placed inside the installation groove 5, and the inner wall of the installation groove 5 is wrapped with rubber sheets 4. The counterweight pier 1 is prefabricated to facilitate transportation and installation within the tunnel. The counterweight pier 1 is installed close to the tunnel wall to reduce water flow resistance and improve the stability of the counterweight pier 1 on the PE pipeline 7. The multiple layers of rubber sheets 4 wrapped around the inner wall of the installation groove 5 reduce wear on the water supply pipeline 7. The rubber sheets act as a buffer layer, directly isolating the concrete from the pipeline surface and reducing frictional losses during installation and operation. The top of the installation groove 5 is circular, and the groove entrance is arched. The arched groove matches the shape of the pipeline, avoiding rigid contact. This maintains the integrity of the pipeline, prevents corrosion caused by damage to the anti-corrosion layer, and reduces pipeline maintenance costs.

[0028] The counterweight pier 1 is equipped with a lifting ring 2 at its top. This lifting ring 2 facilitates handling and installation, allowing for manual transport within the water-bearing tunnel 8. A connecting ring 3 is located on the water-facing side of the counterweight pier 1. Multiple counterweight piers 1 can be connected and fixed via these side connecting rings 3, and the combined installation of multiple counterweight piers 1 effectively increases their anti-buoyancy capacity. The counterweight pier 1 is internally reinforced with steel bars.

[0029] Multiple counterweight piers 1 are installed along the axial direction of the water diversion tunnel 8, and the multiple counterweight piers 1 are sequentially installed outside the pipeline 7. Multiple counterweight piers 1 are installed radially along the water diversion tunnel 8, and the multiple counterweight piers 1 are connected by connecting rings 3.

[0030] The specific technical solution adopted by this utility model is as follows: a prefabricated anti-buoyancy counterweight structure for a water supply pipeline in a water diversion tunnel, including a counterweight pier, a pipeline, a lifting ring, and a connecting ring. The lifting ring is installed on the top of the counterweight pier, and the connecting ring is installed on the water-facing side of the counterweight pier. The base surface of the counterweight pier is rectangular with a large coefficient of friction, so that it has good overall performance and can be used in most situations.

[0031] The precast counterweight piers are made of concrete, and if necessary, steel bars can be installed inside the piers for appropriate reinforcement.

[0032] The counterweight base has a groove at the bottom, the top of the groove is circular, and the groove entrance is a city gate shape. The top of the groove is wrapped with multiple layers of rubber sheets to reduce wear on the water supply pipe.

[0033] To facilitate handling and installation, lifting rings are installed on the top of the counterweight pier to facilitate manual transport within the water-filled tunnel 8.

[0034] The counterweight piers are equipped with connecting rings on their sides. Multiple counterweight piers can be connected and fixed through these side connecting rings. The combined installation of multiple counterweight piers can effectively increase the anti-buoyancy capacity. When the counterweight piers are installed inside the tunnel, the side without connecting rings is close to the tunnel wall, while the side with connecting rings is placed on the water-facing side for easy connection.

[0035] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0036] Reference Figures 1 to 2 This illustrates the specific structure of a preferred embodiment of the present invention. The present invention provides a prefabricated anti-buoyancy counterweight structure for a water supply pipeline in a water diversion tunnel, including a counterweight pier 1, a lifting ring 2, a connecting ring 3, a rubber sheet 4, an installation groove 5, a tunnel wall 6, and a pipeline 7. The lifting ring 2 is disposed on the top of the counterweight pier 1, and the connecting ring 3 is disposed on the side wall of the counterweight pier 1. The counterweight pier 1 can be installed individually or in combination, and is suspended from the pipeline.

[0037] The dimensions of a single counterweight block are determined according to the "Code for Design of Pipeline Structures in Water Supply and Drainage Engineering". The spacing between multiple counterweight blocks can be determined based on the total length of the pipeline. The spacing between multiple counterweight blocks is generally controlled within the range of 4-5m. This smaller spacing limits the deformation of the pipeline during laying, ensuring that the maximum bending stress and strain generated do not exceed safe limits.

[0038] like Figure 2 , 3 As shown, the counterweight pier 1 is made of concrete. When casting the precast counterweight pier, the lifting ring steel bars and the side connecting rings are connected inside, and then the formwork is erected and the concrete is poured. After solidification, the counterweight pier is formed.

[0039] The counterweight block 1 has an installation groove 5 at the bottom. The top of the installation groove 5 is circular and the opening is a city gate-shaped opening. In order to protect the outer anti-corrosion layer of the pipeline and provide appropriate friction resistance, multiple layers of wound rubber sheets 4 are installed on the inner wall of the installation groove 5.

[0040] like Figure 2 , 4 As shown, one side of the counterweight block is tightly attached to the tunnel wall 6 and presses against the pipe 7. To increase the counterweight of the pipe, a connecting ring 3 is installed on the water-facing side of the counterweight block, provided that manual transportation is possible. After the counterweight block is installed, it is connected by a hook. The lifting ring and connecting ring are made of φ8 steel bars, and the rubber sheet is 3mm thick.

[0041] During the construction of pipelines crossing water diversion tunnels, when the weight of the pipeline is less than the buoyancy, counterweights can permanently position the pipeline. The counterweights are manually transported and hoisted onto the pipeline. Once the pipeline is positioned, it can be moved further.

[0042] All other parts not described herein belong to the prior art. This utility model is not limited to the above-described preferred embodiment; anyone can derive other forms of prefabricated anti-buoyancy counterweight structures under the guidance of this utility model. All equivalent variations and modifications made within the scope of this utility model application should be included within the scope of this utility model.

Claims

1. A prefabricated anti-buoyancy counterweight structure for a water supply pipeline in a water diversion tunnel, characterized in that: It includes a counterweight pier (1) and a pipe (7) installed inside the water diversion tunnel. The counterweight pier (1) is installed close to the tunnel wall of the water diversion tunnel. The bottom of the counterweight pier (1) is provided with an installation groove (5) along the axial direction of the water diversion tunnel. The pipe (7) is installed in the installation groove (5). The inner wall of the installation groove (5) is wrapped with a rubber sheet (4).

2. The prefabricated anti-buoyancy counterweight structure for a water supply pipeline in a water diversion tunnel according to claim 1, characterized in that: The top of the mounting slot (5) is circular, and the slot door is a city gate shape.

3. The prefabricated anti-buoyancy counterweight structure for a water supply pipeline in a water diversion tunnel according to claim 1, characterized in that: The counterweight block (1) is equipped with a lifting ring (2) at the top.

4. The prefabricated anti-buoyancy counterweight structure for a water diversion tunnel water supply pipeline according to claim 3, characterized in that: The counterweight pier (1) is provided with a connecting ring (3) on the water-facing side.

5. The prefabricated anti-buoyancy counterweight structure for a water diversion tunnel water supply pipeline according to claim 4, characterized in that: Multiple counterweight piers (1) are provided along the axial direction of the water diversion tunnel, and the multiple counterweight piers (1) are arranged sequentially outside the pipeline (7).

6. The prefabricated anti-buoyancy counterweight structure for a water supply pipeline in a water diversion tunnel according to claim 5, characterized in that: Multiple counterweight piers (1) are provided radially along the water diversion tunnel, and the multiple counterweight piers (1) are connected by connecting rings (3).

7. A prefabricated anti-buoyancy counterweight structure for a water supply pipeline in a water diversion tunnel according to any one of claims 1 to 6, characterized in that: The counterweight block (1) is equipped with reinforcing steel bars inside.

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