Flexible adjustable anti-floating and anti-impact support for underground pipe gallery and pre-tightening setting method

Abstract

The application discloses a flexible and adjustable anti-floating and anti-impact support for an underground pipe gallery and a pre-tightening setting method, which comprises a foundation anchoring support assembly, an elastic bearing assembly, a pre-tightening adjusting assembly and a structural support assembly. The structural support assembly is used for circumferentially clamping and fixing a pipe body. The elastic bearing assembly is used for providing vertical support force to the pipe body and resisting the action of buoyancy. The pre-tightening adjusting assembly is used for setting the pre-compression amount of the elastic bearing assembly according to the design load during the installation stage of the anti-floating and anti-impact support, performing one-time adjustment and locking, and keeping the pre-compression state of the anti-floating and anti-impact support unchanged during operation. Swing limiting assemblies are further arranged on the two sides of the elastic bearing assembly and used for limiting the lateral swing amplitude of the pipe under the impact of water flow. The anti-floating and anti-impact support is installed and completed, is maintained free of maintenance, can still work stably under extremely bad environments such as extreme rainfall, and can meet the multiple requirements of anti-floating, anti-impact and vibration reduction of the internal comprehensive pipe gallery under the extreme water filling condition.

Description

Technical Field

[0001] This invention relates to the field of pipeline support and protection technology, specifically to a flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels and a pre-tightening setting method, which is applicable to the anti-buoyancy and anti-impact safety protection of pipeline systems under the condition of water-filled operation of utility tunnels in the scenario of combined development of rainwater storage and underground utility tunnels. Background Technology

[0002] In integrated development scenarios combining rainwater storage and underground utility tunnels, when extreme rainfall causes urban flooding, rainwater can be directly channeled into the tunnel to temporarily store some of the flooded rainwater using the redundant space of the integrated utility tunnel, while also serving as an emergency drainage channel to alleviate pressure on the urban drainage system. However, after the tunnel is filled with water, the enormous buoyancy generated by the internal water may cause the pipes to float, deform, or even suffer structural damage. At the same time, the high-speed water flow and floating debris carried in the water will directly impact the pipes, further exacerbating the safety risks and seriously threatening pipeline operation. This water-filling condition is sporadic and an extremely low-probability event. Once it occurs, the load is intense, the duration is short, and after filling, the internal space of the utility tunnel is occupied by water, making it impossible for personnel to enter for any on-site operations or adjustments.

[0003] Currently, the main types of pipe supports in underground utility tunnels include fixed supports (rigid supports), sliding supports (guide supports), and spring supports. Existing support designs primarily address conventional needs such as pipe self-weight bearing, thermal expansion and contraction displacement control, and seismic resistance. They lack specific consideration for special loads generated after the tunnel is filled with water, such as pipe buoyancy, water flow impact, and impact from floating objects. Furthermore, existing supports lack flexible buffer structures capable of simultaneously meeting multiple requirements such as anti-buoyancy, anti-impact, and vibration reduction, making it difficult to ensure the safe operation of pipelines within the integrated utility tunnel under extreme water-filling conditions.

[0004] To address the aforementioned technical issues, it is necessary to develop a new type of utility tunnel support that combines anti-buoyancy, anti-scouring, and buffering functions for integrated utility tunnel water-filled operation scenarios. Summary of the Invention

[0005] The purpose of this invention is to address the technical problem that existing pipeline supports cannot meet the multiple requirements of anti-buoyancy, anti-impact, and vibration reduction under water-filled pipe gallery conditions, and to provide a flexible and adjustable anti-buoyancy and anti-impact support for underground pipe galleries and a pre-tightening setting method.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A flexible and adjustable anti-buoyancy and anti-scour support for underground utility tunnels includes a foundation anchoring support assembly. An elastic bearing assembly is mounted on the foundation anchoring support assembly. The elastic bearing assembly is connected to and supports a structural support assembly via a pre-tightening adjustment assembly. The structural support assembly is used to circumferentially clamp and fix the pipeline body. The elastic bearing assembly provides vertical support force to the pipeline body and resists buoyancy. The pre-tightening adjustment assembly is used to set the pre-compression amount of the elastic bearing assembly according to the design load during the installation phase of the anti-buoyancy and anti-scour support, making a one-time adjustment and locking. The anti-buoyancy and anti-scour support maintains its pre-compression state during operation. Swing limiting assemblies are also provided on both sides of the elastic bearing assembly to limit the lateral swing amplitude of the pipeline under water flow impact.

[0007] The flexible and adjustable anti-buoyancy and anti-impact support for the underground utility tunnel is installed and requires no maintenance. Its purely mechanical structure requires no external energy or control system and can operate stably even in harsh environments such as extreme rainfall. The elastic load-bearing components provide continuous flexible anti-buoyancy restraint, ensuring stable pipeline support while retaining necessary elastic deformation capacity, thus solving the problem of insufficient buffering capacity in traditional rigid supports and adapting to dynamic changes in buoyancy during the filling and draining of the utility tunnel. The pre-tightening adjustment components enable adjustable flexibility; by adjusting the spring pre-compression, the same specification of spring can adapt to different pipe diameters, weights, and impact loads, improving the product's versatility and adaptability. The swing limit components provide graded restraint, ensuring both flexibility during normal operation and safety under extreme impacts.

[0008] In some embodiments, the structural support assembly includes an upper semi-circular hoop and a lower semi-circular hoop connected to form a ring-like structure. Support ears are provided on both sides of the upper and lower semi-circular hoops, and the preload adjustment assembly is connected to the support ears. The upper and lower semi-circular hoops are bolted together to form a ring-like structure, achieving reliable clamping and positioning of the pipe body. The support ears can also be used to connect the preload adjustment assembly.

[0009] In some embodiments, the inner side of the structural support component is provided with an anti-slip and vibration-damping rubber layer. The surface of the anti-slip and vibration-damping rubber layer is provided with anti-slip texture, and the interior is a hollow structure, which is used to prevent the pipe body from sliding axially under the action of water flow, and at the same time absorb the energy of axial impact and vibration.

[0010] In some embodiments, the elastic bearing component includes a compression spring unit disposed on the base anchoring support component, the base anchoring support component is provided with a bearing base, the compression spring unit is disposed on the bearing base, the compression spring unit is connected to the preload adjustment component, the preload adjustment component is further provided with a pressure plate, and limit limiting members located above and below the pressure plate, the limit limiting members being used to set and lock the allowable vertical travel of the pressure plate after the preload adjustment is completed.

[0011] For the entire pipeline, multiple anti-buoyancy buffer supports can be installed. Each elastic bearing component can contain two or more compression spring units, pressure plates, and limit switches, with directional compression achieved through a guide structure. The compression spring units collectively provide vertical elastic support force; the pressure plates transmit the force between the structural support components and the compression spring units; and the limit switches limit the maximum vertical travel of the pressure plates. When the pipeline is displaced upwards by buoyancy, the compression springs are gradually released, and their elastic force continuously adjusts with the displacement, thus forming a flexible constraint and avoiding the instantaneous impact caused by rigid limits.

[0012] Furthermore, the preload adjustment assembly is a purely mechanical structure, including an adjusting screw, an adjusting nut, a pressure plate, and a locking nut mounted on the adjusting screw. One end of the adjusting screw is connected to the structural support assembly, and the compression spring unit is disposed on the outer periphery of the other end. The pressure plate abuts against the compression spring unit, and the adjusting nut and the locking nut are located above and below the pressure plate. By adjusting the adjusting nut, the position of the pressure plate is changed, thereby changing the preload of the compression spring unit. Preload adjustment is only performed during the installation phase; after the support is put into operation, the spring preload is no longer changed by adjusting the nut.

[0013] Furthermore, the swing limiting assembly includes an L-shaped side limiting baffle connected to the pressure plate, and a limiting post and a buffer rubber pad connected to the bearing base. The limiting post is located outside the side limiting baffle, and the buffer rubber pad is located on both sides of the compression spring unit. When the swing amplitude of the pipe body is small, the elastic bearing assembly provides lateral restoring force, and after contacting the buffer rubber pad, the buffer rubber pad provides flexible buffering. When the swing amplitude of the pipe body exceeds a preset value, the limiting baffle and the limiting post provide rigid constraint.

[0014] Furthermore, the bearing base includes a base plate installed on the foundation anchoring support assembly, a pair of side plates are provided on the base plate, the compression spring unit is located between the pair of side plates, the two ends of the limiting post are connected to the pair of side plates, and rubber vibration damping pads are provided on the inner side of the side plates; the buffer rubber pad is provided on the base plate.

[0015] In some embodiments, the exposed metal parts of the structural support assembly, the elastic bearing assembly, the preload adjustment assembly, the swing limiting assembly, and the foundation anchoring support assembly are all provided with anti-corrosion coatings.

[0016] A pre-tightening method for a flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels is disclosed. The pre-tightening method includes the following steps: During the installation phase of the anti-buoyancy and anti-impact support, the target pre-compression amount required for the elastic bearing component is determined by calculation or experiment based on the self-weight of the pipeline, buoyancy, and impact force bearing and protection requirements; during on-site installation, the elastic bearing component is compressed to the target pre-compression amount by manually operating the pre-tightening adjustment component; the pre-tightening adjustment component is then locked and fixed; after the anti-buoyancy and anti-impact support is put into operation, the pre-tightening adjustment component remains locked, allowing the anti-buoyancy and anti-impact support to serve for a long period with preset flexibility.

[0017] Specifically, based on the self-weight of the pipeline, the buoyancy under the design water level, and the vertical impact effect that needs to be borne by the elastic bearing components, the design vertical elastic bearing capacity F at each anti-buoyancy buffer support is determined. v The maximum allowable vertical displacement Z of the pipeline max And the parameters of the compression spring, and determine the target pre-compression amount δ0 accordingly; Rotate the preload adjustment assembly to adjust the compression spring unit of the elastic bearing assembly to the target preload amount δ0; Tighten the pre-tightening adjustment component to lock and fix the pre-tightening adjustment position; After the pre-tightening adjustment is completed, the vertical limit stroke of the bearing plate is set by the limit limit component on the elastic bearing component, and the lateral graded limit position of the swing limit component is set.

[0018] Furthermore, let the stiffness of the i-th compression spring element be k. i The total equivalent stiffness of the elastic bearing component is K=Σk i When n identical compression spring units are used, and the stiffness of a single spring is k, K=nk; within the linear working range, the target initial spring force F0 and the target pre-compression δ0 satisfy F0=Kδ0, and F0 is not less than the design vertical elastic bearing capacity F. v When the pipe is displaced upward by z, the remaining compression is δ. 0-z and satisfy (δ0-Z) max )≥δ min ≥0 and δ0≤δ a δ min This indicates the minimum remaining compression.

[0019] Let S1 be the first limiting gap when the buffer rubber pad begins to participate in buffering, and S2 be the second limiting displacement when the limiting baffle implements rigid constraint, satisfying 0 < S1 < S2 and S2 not greater than the allowable lateral displacement of the pipeline; let h be the vertical limiting stroke of the limit limiting component (33). L Then hL≤(δ0-δ min ).

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. The flexible and adjustable anti-buoyancy and anti-impact support for the underground utility tunnel is completed upon installation and requires no maintenance; the purely mechanical structure requires no external energy or control system and can still work stably in harsh environments such as extreme rainfall. Moreover, through the coordinated cooperation of the elastic bearing component, the pre-tightening adjustment component, and the swing limiting component, it can meet the multiple requirements of anti-buoyancy, anti-impact, and vibration reduction inside the integrated utility tunnel under extreme water filling conditions; 2. The elastic bearing component provides a continuous flexible anti-buoyancy constraint force, which retains the necessary elastic deformation capacity while meeting the stable support of the pipeline, solving the problem of the lack of buffer capacity of traditional rigid supports, and adapting to the dynamic changes of buoyancy during the filling and draining of the utility tunnel; 3. The pre-tightening adjustment component realizes the adjustable design of flexibility, which can be adjusted according to the pipeline before installation. 4. The pre-compression amount of the spring is preset to meet the requirements of bearing and protecting against gravity, buoyancy and impact forces; 5. The swing limit component realizes graded constraints, which not only ensures the flexibility during normal operation, but also ensures the safety under extreme impacts; 6. The water flow impact force along the pipeline axis is buffered and dissipated by the anti-slip and vibration damping rubber layer on the inner side of the structural support component; the vertical buoyancy of the pipeline and the water flow impact force perpendicular to the pipeline axis are resisted and buffered by the flexible anti-buoyancy constraint and lateral restoring force provided by the compression spring unit, respectively, and the lateral swing caused by the water flow impact force is controlled by the swing limit component to control the maximum swing amplitude; 7. The modular design is adopted, and each functional component can be independently disassembled and replaced, which has the advantages of convenient installation and maintenance, low maintenance cost and strong engineering adaptability; the compression spring unit in the elastic bearing component adopts standardized spring products, which is convenient for engineering promotion and application. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels according to the present invention. Figure 2 This is a schematic diagram of the structure support component of the present invention; Figure 3 This is a schematic diagram of the structure of the elastic bearing component and the swing limiting component of the present invention; Figure 4 This is a schematic diagram of the pre-tightening adjustment component of the present invention; In the diagram: 1. Pipe body; 2. Structural support assembly; 201. Upper semi-circular hoop; 202. Lower semi-circular hoop; 203. Support ear plate; 204. Anti-slip and vibration-damping rubber layer; 3. Elastic load-bearing assembly; 301. Compression spring unit; 302. Pressure plate; 303. Limiting component; 4. Pre-tightening adjustment assembly; 401. Adjusting screw; 402. Adjusting nut; 403. Pressure plate; 404. Locking nut; 5. Swing limiting assembly; 501. Side limiting baffle; 502. Limiting post; 503. Buffer rubber pad; 6. Foundation anchoring support assembly; 601. Bearing base; 602. Rubber vibration damping pad. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 invention.

[0024] Example 1: A flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels, combined with... Figures 1-4 As shown, the system includes a basic anchoring support assembly 6, on which an elastic bearing assembly 3 is provided. The elastic bearing assembly 3 is connected to and supports a structural support assembly 2 via a pre-tightening adjustment assembly 4. The structural support assembly 2 is used to circumferentially clamp and fix the pipe body 1. The elastic bearing assembly 3 is used to provide vertical support force to the pipe body 1 and resist buoyancy. The pre-tightening adjustment assembly 4 is used to set the pre-compression amount of the elastic bearing assembly 3 according to the design load during the installation stage of the anti-buoyancy and anti-impact support, and to adjust and lock it in one go. The anti-buoyancy and anti-impact support maintains a constant pre-compression state during operation. Swing limiting assemblies 5 are also provided on both sides of the elastic bearing assembly 3 to limit the lateral swing amplitude of the pipe under the impact of water flow.

[0025] The installation of the flexible and adjustable anti-buoyancy and anti-impact support for the underground utility tunnel is completed immediately, requiring no maintenance. The purely mechanical structure requires no external energy or control system and can still work stably in harsh environments such as extreme rainfall. Moreover, through the coordinated operation of the elastic bearing component 3, the pre-tightening adjustment component 4, and the swing limiting component 5, it can meet the multiple requirements of the integrated utility tunnel for anti-buoyancy, anti-impact, and vibration reduction under extreme water filling conditions.

[0026] The elastic bearing component 3 provides a continuous flexible anti-buoyancy constraint force, which retains the necessary elastic deformation capacity while ensuring the stable support of the pipeline, solves the problem of lack of buffer capacity of traditional rigid supports, and adapts to the dynamic changes of buoyancy during the filling and draining of the pipeline.

[0027] The pre-tension adjustment component 4 enables an adjustable flexibility design, allowing the spring pre-compression amount to be preset according to the pipe's self-weight, buoyancy, and impact load requirements before installation. While the springs are standardized products with limited specifications, adjusting the spring pre-compression amount allows springs of the same specification to adapt to different pipe diameters, self-weights, and impact loads, improving the product's versatility and adaptability.

[0028] The swing limit component 5 achieves graded constraints, ensuring both flexibility during normal operation and safety under extreme impacts.

[0029] The structural support component 2, the elastic bearing component 3, the pre-tightening adjustment component 4, the swing limiting component 5, and the foundation anchoring support component 6 all adopt a modular design. Each functional component can be independently disassembled and replaced, which has the advantages of convenient installation and maintenance, low maintenance cost, and strong engineering adaptability. The compression spring unit in the elastic bearing component adopts standardized spring products, which is convenient for engineering promotion and application.

[0030] In some embodiments, the structural support assembly 2 includes an upper semi-circular hoop 201 and a lower semi-circular hoop 202 connected to form a ring-shaped structure. Supporting lugs 203 are respectively provided on both sides of the upper and lower semi-circular hoop 201 and the lower semi-circular hoop 202. The pre-tightening adjustment assembly is connected to the supporting lugs 203. The upper and lower semi-circular hoops are bolted together to form a ring-shaped structure, achieving reliable clamping and positioning of the pipe body. The supporting lugs can also be used to connect the pre-tightening adjustment assembly.

[0031] In some embodiments, the inner side of the structural support component 2 is provided with an anti-slip and vibration-damping rubber layer 204. The anti-slip and vibration-damping rubber layer 204 is made of a high-elasticity rubber material, with anti-slip texture on its surface and a hollow structure inside, which is used to prevent the pipe body from sliding axially under the action of water flow, and at the same time absorb the energy of axial impact and vibration.

[0032] In some embodiments, the elastic bearing component 3 includes a compression spring unit 301 disposed on the foundation anchoring support component 6. The foundation anchoring support component 6 is provided with a bearing base 601, and the compression spring unit 301 is disposed on the bearing base 601. The compression spring unit 301 is connected to the pre-tightening adjustment component 4. The pre-tightening adjustment component 4 is also provided with a pressure plate 302 and limit limiting members 303 located above and below the pressure plate 302. The limit limiting members 303 are used to set and lock the allowable vertical travel of the pressure plate 302 after the pre-tightening adjustment is completed.

[0033] For the entire pipeline, multiple anti-buoyancy buffer supports can be installed. Each elastic bearing component can contain two or more compression spring units 301, pressure plates 302, and limit stop components 303, with directional compression achieved through a guide structure. The compression spring units 301 collectively provide vertical elastic support force; the pressure plates 302 are used to transmit the force between the structural support components and the compression spring units; and the limit stop components 303 are used to limit the maximum vertical travel of the pressure plates. When the pipeline is displaced upwards by buoyancy, the compression springs are gradually released, and their elastic force is continuously adjusted according to the displacement, thus forming a flexible constraint and avoiding the instantaneous impact caused by rigid limits.

[0034] The limit stop 303 is positioned at the corresponding location of the adjusting screw and the pressure plate, and can be composed of an upper limit nut and a lower limit nut respectively located on the upper and lower sides of the pressure plate. The upper and lower limit nuts are used to set the allowable vertical travel of the pressure plate and are locked after setting. Their function is to limit the extreme position during operation and do not participate in the adjustment of the pre-compression amount of the compression spring. The pre-tightening adjustment component and the limit stop are functionally independent.

[0035] Furthermore, the preload adjustment assembly 4 is a purely mechanical structure, including an adjusting screw 401, an adjusting nut 402, a pressure plate 403, and a locking nut 404 disposed on the adjusting screw 401. One end of the adjusting screw 401 is connected to the structural support assembly, and the compression spring unit 301 is disposed on the outer periphery of the other end. The pressure plate 403 abuts against the compression spring unit 301. The adjusting nut 402 and the locking nut 404 are located above and below the pressure plate 403. The upper part of the adjusting screw 401 is a smooth guide section, and the lower part is a threaded adjustment section. The adjusting nut cooperates with the threaded adjustment section. By adjusting the adjusting nut, the position of the pressure plate is changed, thereby changing the preload of the compression spring unit 301. Preload adjustment is only performed during the installation stage; after the bracket is put into operation, the spring preload is no longer changed by adjusting the nut.

[0036] Furthermore, the swing limiting assembly 5 includes an L-shaped side limiting baffle 501 connected to the pressure plate 302, and a limiting post 502 and a buffer rubber pad 503 connected to the bearing base 601. The limiting post 502 is located outside the side limiting baffle 501, and the buffer rubber pad 503 is located on both sides of the compression spring unit 301. When the swing amplitude of the pipe body is small, the elastic bearing assembly 3 provides lateral restoring force, and after contacting the buffer rubber pad 503, the buffer rubber pad 503 provides flexible buffering. When the swing amplitude of the pipe body exceeds a preset value, the side limiting baffle 501 and the limiting post 502 provide rigid constraint.

[0037] The pressure plate 302 and the side limiting baffles 501 located on both sides of it can be integrally formed or fixedly connected to form a gate-shaped load-bearing and limiting component. Functionally, the pressure plate 302 belongs to the elastic load-bearing component 3 and is used to bear and transmit vertical forces; the plates extending downward on both sides of the pressure plate 302 constitute the side limiting baffles 501, which belong to the swing limiting component 5 and are used to limit the lateral swing of the pipeline and structural support components. This integrated structure does not change the functional division of the two components.

[0038] The buffer rubber pad 503 is disposed at the impact position of the side limiting baffle 501 or the limiting post 502. The lateral gap from the side edge of the structural support component 2 to the initial contact position of the buffer rubber pad 503 is defined as the first limiting gap S1, and the lateral displacement to the rigid limit position of the side limiting baffle 501 is defined as the second limiting displacement S2, satisfying 0 < S1 < S2. When the lateral displacement is less than S1, the restoring force is mainly provided by the lateral stiffness of the elastic bearing component; after reaching S1, the buffer rubber pad participates in deformation energy absorption; when the lateral displacement further increases to S2, the side limiting baffle implements rigid limiting, forming a graded protection of "elastic recovery—rubber buffer—rigid limiting".

[0039] In this embodiment, the exposed metal parts of the structural support component, the elastic bearing component, the pre-tightening adjustment component, the swing limiting component, and the foundation anchoring support component are all provided with anti-corrosion coatings to meet the durability requirements in a water environment.

[0040] Furthermore, the bearing base 601 includes a base plate installed on the foundation anchor support assembly 6, a pair of side plates are provided on the base plate, the compression spring unit 301 is located between the pair of side plates, the two ends of the limiting post 502 are connected to the pair of side plates, and a rubber damping pad 602 is provided on the inner side of the side plate; the buffer rubber pad is provided on the base plate.

[0041] In this embodiment, the water flow impact force along the pipe axis is buffered and dissipated by the anti-slip and vibration-damping rubber layer 204 inside the structural support component 2; the vertical buoyancy of the pipe and the water flow impact force perpendicular to the pipe axis are resisted and buffered by the flexible anti-buoyancy constraint and lateral restoring force provided by the compression spring unit 301, respectively, wherein the lateral sway caused by the water flow impact force is controlled by the swing limiting component 5 to control the maximum sway amplitude. The anti-slip and vibration-damping rubber layer, the compression spring unit, and the swing limiting component work together to achieve buffering and protection in all directions. The compression spring unit and the anti-slip and vibration-damping rubber layer are manufactured as independent modules and installed on the support body through standardized connection interfaces. Any damaged module can be disassembled and replaced individually.

[0042] Example 2: A pre-tightening method for a flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels is provided. The pre-tightening method includes the following steps: During the installation stage of the anti-buoyancy and anti-impact support, the target pre-compression amount required for the elastic bearing component is determined by calculation or experiment based on the self-weight of the pipeline body, buoyancy, impact force bearing and protection requirements, etc.; During on-site installation, the elastic bearing component is compressed to the target pre-compression amount by manually operating the pre-tightening adjustment component; The pre-tightening adjustment component is locked and fixed; After the anti-buoyancy and anti-impact support is put into operation, the pre-tightening adjustment component remains locked, so that the anti-buoyancy and anti-impact support can serve for a long time with preset flexibility.

[0043] Specifically, the steps include the following: S1: Determine design parameters. Based on the self-weight of the pipeline, the buoyancy force under the design water level, and the vertical impact effect to be borne by the elastic bearing component 3, determine the design vertical elastic bearing capacity F at each anti-buoyancy buffer support. v The maximum allowable vertical displacement Z of the pipeline max The parameters of the compression spring are determined, and the target pre-compression δ0 is determined accordingly; the stiffness of the i-th compression spring element is set to k. i The total equivalent stiffness of the elastic bearing component is K=Σk i When n identical compression spring units are used, and the stiffness of a single spring is k, K=nk; within the linear working range, the target initial spring force F0 and the target pre-compression δ0 satisfy F0=Kδ0, and F0 is not less than the design vertical elastic bearing capacity F. v .

[0044] S2: Perform vertical stroke verification. When the pipe moves upward by z, the remaining compression δ = δ 0-z The corresponding spring force is F. s =K(δ0-z). The target pre-compression satisfies (δ0-Z). max )≥δ min ≥0 and δ0≤δ a δ minTo maintain the minimum residual compression for effective spring operation, δ a The allowable pre-compression of the selected spring is determined to ensure that the compressed spring remains effective within the design displacement range and allows for necessary buffer travel.

[0045] S3: Implement pre-tightening adjustment. Rotate the pre-tightening adjustment assembly to adjust the compression spring unit 301 of the elastic bearing assembly to the target pre-compression amount δ0; that is, rotate the adjusting nut to move the pressure plate along the threaded adjustment section of the adjusting screw and compress the spring until the measured pre-compression amount reaches δ0. The theoretical axial adjustment amount Δh = mP when the thread lead of the adjusting screw is P and the adjusting nut rotates m turns can be verified by combining a scale or the measured spring length. After reaching the target value, tighten the locking nut to lock the pre-tightening adjustment position.

[0046] S4: Set the vertical limit travel. After the pre-tightening adjustment is completed, the vertical limit travel of the bearing plate is set by the limit limit member on the elastic bearing component, and the lateral graded limit position of the swing limit component is set.

[0047] Specifically, adjust the upper and lower limit nuts at the corresponding positions of the pressure plate to adjust the limit travel h. L Not greater than the allowable vertical displacement Z of the pipeline max And satisfy hL≤(δ0-δ min This mechanically limits the pressure plate 302 before the spring enters the unfavorable working range; then the upper and lower limit nuts are tightened; this step is only used to set the limit position of the pressure plate and does not change the spring pre-compression amount set in step S3.

[0048] S5: Set lateral graded limit switches and put them into operation. Determine the first limit gap S1 and the second limit displacement S2 based on the allowable lateral displacement of the pipeline, ensuring that 0 < S1 < S2 and S2 is not greater than the allowable lateral displacement of the pipeline. After the anti-buoyancy and anti-impact support is put into operation, the pre-tightening adjusting nut, locking nut, and limit nut remain locked, eliminating the need for on-site adjustments during the pipe gallery filling process.

[0049] When the lateral displacement of the pipeline is less than S1, the lateral stiffness of the elastic bearing component 3 provides the restoring force; after reaching S1, the buffer rubber pad 503 is deformed by pressure and absorbs the impact energy; when the lateral displacement further increases to S2, the side limiting baffle 501 implements rigid limiting to prevent the pipeline from having excessive lateral displacement.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels, characterized in that, The system includes a basic anchoring support assembly, on which an elastic bearing assembly is mounted. The elastic bearing assembly is connected to and supports a structural support assembly via a pre-tightening adjustment assembly. The structural support assembly is used to circumferentially clamp and fix the pipe body. The elastic bearing assembly is used to provide vertical support force to the pipe body and resist buoyancy. The pre-tightening adjustment assembly is used to set the pre-compression amount of the elastic bearing assembly according to the design load during the installation stage of the anti-buoyancy and anti-impact support, perform a one-time adjustment and lock it, and the anti-buoyancy and anti-impact support maintains a constant pre-compression state during operation. Swing limiting assemblies are also provided on both sides of the elastic bearing assembly to limit the lateral swing amplitude of the pipe under water flow impact.

2. The flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels according to claim 1, characterized in that, The structural support assembly includes an upper semi-circular hoop and a lower semi-circular hoop that are connected to form an encircling structure. Supporting ear plates are provided on both sides of the upper and lower semi-circular hoops, and the pre-tightening adjustment assembly is connected to the supporting ear plates.

3. The flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels according to claim 1, characterized in that, The inner side of the structural support component is provided with an anti-slip and vibration-damping rubber layer. The surface of the anti-slip and vibration-damping rubber layer is provided with anti-slip texture, and the inside is a hollow structure, which is used to prevent the pipe body from sliding axially under the action of water flow, and at the same time absorb the energy of axial impact and vibration.

4. The flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels according to claim 1, characterized in that, The elastic bearing component includes a compression spring unit disposed on the foundation anchor support component. The foundation anchor support component is provided with a bearing base. The compression spring unit is disposed on the bearing base and is connected to the preload adjustment component. The preload adjustment component is also provided with a pressure plate and limit limiting members located above and below the pressure plate. The limit limiting members are used to set and lock the allowable vertical travel of the pressure plate after the preload adjustment is completed.

5. The flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels according to claim 4, characterized in that, The preload adjustment assembly includes an adjusting screw, an adjusting nut, a pressure plate, and a locking nut disposed on the adjusting screw. One end of the adjusting screw is connected to the structural support assembly, and the compression spring unit is disposed on the outer periphery of the other end. The pressure plate abuts against the compression spring unit, and the adjusting nut and the locking nut are located above and below the pressure plate. By adjusting the adjusting nut, the position of the pressure plate is changed, thereby changing the preload of the compression spring unit.

6. The flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels according to claim 4, characterized in that, The swing limiting assembly includes an L-shaped side limiting baffle connected to the pressure plate, and a limiting post and a buffer rubber pad connected to the bearing base. The limiting post is located outside the side limiting baffle, and the buffer rubber pad is located on both sides of the compression spring unit. When the swing amplitude of the pipe body is small, the elastic bearing assembly provides lateral restoring force, and after contacting the buffer rubber pad, the buffer rubber pad provides flexible buffering. When the swing amplitude of the pipe body exceeds a preset value, the limiting baffle and the limiting post provide rigid constraint.

7. The flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels according to claim 6, characterized in that, The bearing base includes a base plate installed on the foundation anchor support assembly, a pair of side plates are provided on the base plate, the compression spring unit is located between the pair of side plates, the two ends of the limiting post are connected to the pair of side plates, and rubber vibration damping pads are provided on the inner side of the side plates; the buffer rubber pad is provided on the base plate.

8. The flexible and adjustable anti-buoyancy and anti-impact support for underground utility tunnels according to claim 1, characterized in that, The exposed metal parts of the structural support assembly, the elastic bearing assembly, the pre-tightening adjustment assembly, the swing limiting assembly, and the foundation anchoring support assembly are all provided with anti-corrosion coatings.

9. The pre-tightening method for the flexible adjustable anti-buoyancy and anti-impact support of underground utility tunnels according to any one of claims 1 to 8, characterized in that, The pre-tightening setting method includes the following steps: Based on the pipeline's self-weight, the buoyancy force at the design water level, and the vertical impact effect to be borne by the elastic bearing components, the design vertical elastic bearing capacity F at each anti-buoyancy buffer support is determined. v The maximum allowable vertical displacement Z of the pipeline max And the parameters of the compression spring, and determine the target pre-compression amount δ0 accordingly; Rotate the preload adjustment assembly to adjust the compression spring unit of the elastic bearing assembly to the target preload amount δ0; Tighten the pre-tightening adjustment component to lock and fix the pre-tightening adjustment position; After the pre-tightening adjustment is completed, the vertical limit stroke of the bearing plate is set by the limit limit component on the elastic bearing component, and the lateral graded limit position of the swing limit component is set.

10. The pre-tightening method for the flexible and adjustable anti-buoyancy and anti-impact support of underground utility tunnels according to claim 9, characterized in that, Let the stiffness of the i-th compression spring element be k. i The total equivalent stiffness of the elastic bearing component is K=Σk i When n identical compression spring units are used, and the stiffness of a single spring is k, then K = nk. Within the linear operating range, the target initial spring force F0 and the target precompression δ0 satisfy F0=Kδ0, and F0 is not less than the design vertical elastic bearing capacity F. v When the pipe is displaced upward by z, the remaining compression is δ. 0-z and satisfy (δ0-Z) max )≥δ min ≥0 and δ0≤δ a δ min This indicates the minimum remaining compression.

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