Method for modular assembly of a truss of a closure plug assembly pile body

Abstract

The application discloses a kind of breach plugging assembly type pile body truss modular assembly method, belong to major natural disaster prevention and public safety technical field.The method includes four steps of breach monitoring and situation assessment, emergency rescue resource preparation, assembly type pile body truss module cooperative plugging operation, later reinforcement.Through the steel pipe pile that is punched into in upstream and downstream of breach, form box type interception structure by quickly assembling the scaffold steel pipe truss module prefabricated on embankment and steel pipe pile, effectively reduce the flow velocity of breach mouth water;Tilt fill stone residue material between the interception structure and form occupation body, throw fill loose soil after closure and close gas, finally through the later reinforcement of building moon embankment and slurry pressure injection.The application is especially suitable for important embankment breach emergency rescue plugging with fast water flow velocity and deep water depth through pile body-truss modular cooperative design, with fast emergency rescue construction speed, strong safety, high one-time success rate, solid and reliable characteristics, suitable for emergency rescue under extreme hydrological conditions.

Description

Technical Field

[0001] This invention belongs to the field of major natural disaster prevention and control and public safety technology, specifically involving a modular assembly method for prefabricated pile trusses for breach sealing. It is particularly suitable for emergency breach sealing of important dikes with fast water flow and deep water, and can also be used for emergency breach sealing of general dike projects. Background Technology

[0002] my country is crisscrossed by rivers and prone to frequent floods. The country has constructed 330,600 kilometers of dikes at or above Level 5, protecting 682 million people and 629 million mu (approximately 41.6 million hectares) of farmland along its banks. However, about 23% of these dikes still do not meet flood control standards, and the number of dike breaches is on the rise due to frequent extreme weather events. In 2021, torrential rains in Henan Province caused 127 dike breaches, and in 2023, torrential rains in North China caused dike breaches that resulted in direct economic losses exceeding 100 billion yuan.

[0003] Existing dike breach sealing technologies are mainly divided into three categories: horizontal sealing, vertical sealing, and hybrid sealing. The core of these technologies lies in the rapid stabilization of the dike head and high-intensity encroachment. However, current mainstream technologies suffer from the following significant drawbacks: 1. High material loss rate when dumped: Traditional dumping of materials such as boulders and geotextile bags results in a loss rate as high as 30%-50% under the action of high-velocity water flow, which seriously affects the efficiency of emergency rescue. 2. High dependence on large equipment: Specialized equipment such as pile driving boats and helicopters are difficult to deploy quickly at disaster relief sites with inconvenient transportation and narrow spaces, with an average arrival time of more than 24 hours. 3. Poor structural stability: Existing steel-wood-earth-rock composite dam technology mainly relies on the self-weight of earth and rock to retain water, and has weak scour resistance. 4. Long construction period: Traditional methods take an average of more than 72 hours from site entry to closure, often missing the best opportunity for emergency rescue.

[0004] Although technologies such as mechanized emergency repair using large wire mesh cages, sheet pile reinforcement, and self-closing barrier methods have been developed both domestically and internationally, none have resolved the core contradiction between structural stability and rapid construction under high flow velocities. While sheet pile technology can improve structural strength, it requires a long time from site entry to closure for wider breaches, easily missing the optimal emergency repair opportunity. Although self-closing barrier methods can reduce flow velocity, their structural integrity is poor, making them unable to withstand the lateral pressure of large volumes of rock and gravel.

[0005] Therefore, developing a rapid dam breach sealing technology that is fast to construct, structurally stable, and adaptable to extreme hydrological conditions has become a major technical problem that urgently needs to be solved in the field of flood control engineering. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a modular assembly method for prefabricated pile trusses for breach sealing. This method employs a comprehensive approach: head protection → integrated construction of steel pipe piles and truss modules → closure and breach reinforcement → dike reinforcement and double-sealing technology to achieve efficient breach sealing. First, ton bags are used to reinforce the dike heads on both sides of the breach, forming a head protection layer that effectively inhibits water erosion and prevents breach expansion. Then, a lifting and piling machine is used to precisely drive steel pipe piles into the dike foundations on both sides of the breach and into the breach area. Finally, scaffolding is installed... The steel pipe truss modules are quickly assembled with the upstream and downstream piles to form an integrated pile truss structure that shares the load, providing stable support for subsequent filling. Stone chips are dumped between the upstream and downstream pile truss modules using dump trucks, and the stone chips are continuously filled to advance the embankment, eventually completing the closure. Loose soil is then dumped into the upstream pile truss to achieve airtightness. After closure, the main body of the embankment is repaired and reinforced, and a crescent embankment is added on the back side of the river. The pores are filled with mud grout to form a multi-layered seepage prevention system, significantly improving the structural durability.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: The modular assembly method for sealing breaches using prefabricated pile trusses includes four main steps: breach monitoring and situation assessment, emergency resource preparation, coordinated breach sealing operations using prefabricated pile truss modules, and post-construction reinforcement. Details are as follows: The modular assembly method for prefabricated pile trusses for breach sealing includes the following steps: S1. Breach monitoring and situation assessment: Real-time monitoring of the dynamic changes in the breach width, water depth and flow velocity distribution, and water scouring characteristics; establishing a breach development prediction model based on monitoring data; and formulating emergency response plans. S2. Emergency Rescue Resource Preparation: Establish a professional emergency rescue team and prepare sealing materials and construction equipment; the sealing materials include steel pipe piles, scaffolding steel pipes, ton bags filled with sand and gravel, stone chips and loose soil; the construction equipment includes a hoisting and piling machine, excavator, loader, dump truck with a load capacity of ≥10t and surveying instruments; S3. Coordinated plugging operation of prefabricated pile truss modules: S3-1, Head protection and work surface preparation: Use ton bags filled with sand and gravel to reinforce the foundation and protect the toe of the dike on both sides of the breach, forming a head protection with a height of 1-3m; level and expand the top of the dike on both sides of the breach, and construct a construction platform with a width of not less than 15m. S3-2. Integrated construction of pile body and truss module: A row of steel pipe piles is driven into the top of the dike on both sides of the breach and upstream and downstream of the breach area, with a spacing of 8m between the two rows of steel pipe piles in the direction of water flow; scaffolding steel pipe truss modules are prefabricated on the working surface of the dike top, and the truss modules are hoisted and combined with the upstream and downstream steel pipe piles to form an integrated box-type interception structure of upstream and downstream double-row pile truss. S3-3, Advancement and Closure: Simultaneously from both sides of the breach towards the middle, stone chips are poured between the upstream and downstream double-row pile truss integrated box-type interception structure, gradually advancing to form an advance body until closure; after closure, loose soil is immediately thrown upstream of the breach to form a closure layer with a thickness of not less than 1m to block the seepage channel. S4. Post-construction reinforcement: Strengthen the main structure of the dike, build a crescent dike on the back side of the dike, and inject mud into the gaps inside the integrated box-type interception structure of the upstream and downstream pile trusses and the gaps between the crescent dike and the original dike to fill the gaps and form a dense seepage-proof layer.

[0008] Furthermore, in step S2, the steel pipe pile has a diameter of 219mm, a wall thickness of 14mm, and a length of 6m. If the length is insufficient, it can be welded on site. The scaffolding steel pipe has a diameter of 48mm and a wall thickness of 2.5mm, 2.75mm, or 3.5mm.

[0009] Furthermore, in step S3-2, the driving depth of the steel pipe piles is not less than 3m, and the depth of penetration into the stable soil layer is not less than 1.5m; the spacing of the steel pipe piles perpendicular to the water flow direction is determined according to the water flow velocity: when the flow velocity is >1m / s, the pile spacing is 2.0m; when the flow velocity is <1m / s, the pile spacing is 3.0m.

[0010] Furthermore, in step S3-2, the dimensions of the cuboid scaffolding steel pipe truss module are 5.0m×3.0m×4.0m (length×width×height), with two 1.0m×1.0m holes reserved along the length direction. The center distance of the holes matches the spacing between the steel pipe piles, and the total weight of a single module is <2t.

[0011] Furthermore, in step S3-2, the scaffold steel pipes are connected to form truss modules using right-angle couplers and swivel couplers, with a node spacing of no more than 1.0m; after the truss modules are inserted into the steel pipe piles through the reserved holes, no connecting parts are provided between the truss modules and the steel pipe piles, and the truss modules are positioned solely by their own weight and the pile body.

[0012] Furthermore, in step S3-3, the particle size of the stone slag is not less than 50cm and the weight of a single piece is ≥50kg; when the width of the opening is reduced to 5-8m, large stones with a weight of ≥100kg are concentrated and thrown to close the gap; the soil sealing operation is completed within 2 hours after the gap is closed.

[0013] Furthermore, in step S4, the height of the moon dike is level with the top of the original dike, the top width is 3-5m, the slope is 1:2, and the overlap length with both ends of the original dike is not less than 10m; the mud injection pressure is controlled at 0.2-0.3MPa until the mud continuously overflows from the surface.

[0014] Using the above technical solution, the specific functions of each step and main component in this invention are as follows: 1. Breach monitoring and situation assessment: Real-time monitoring of breach hydrological parameters using specialized equipment such as ADCP current meters and depth sounders, establishing a breach development prediction model to provide a scientific basis for emergency response plans and avoid blind construction.

[0015] 2. Emergency resource preparation: All materials and equipment are general-purpose engineering materials and conventional construction equipment are used, and no special emergency equipment is required, which enables rapid resource allocation.

[0016] Steel pipe piles: As load-bearing components, they are driven into the foundation of the dike on both sides of the breach and after the breach to provide strong horizontal resistance against the impact of water flow and the lateral pressure of the stone and rubble. Scaffolding steel pipe truss module: It is prefabricated on the top of the dike using general scaffolding steel pipes. It is lightweight and quick to assemble. After being assembled with steel pipe piles, it forms an integral load-bearing structure. It can not only effectively reduce the flow velocity of water at the mouth (by 40%-50%), but also serve as a retaining skeleton for stone and rubble materials, reducing the loss rate of thrown material to below 10%. Ton-sized wrapping head: Quickly stabilizes the dike head, preventing water erosion from causing the breach to widen further; Upstream and downstream double-row pile truss integrated box-type interception structure: forms a stable interception space, ensuring that the stone slag can be stably accumulated inside the structure.

[0017] Integrated lifting and piling machine: By changing the piling head or lifting clamp, the two functions of piling and lifting can be switched.

[0018] 3. Collaborative plugging operation of prefabricated pile truss modules: Head protection and work surface preparation: to provide a safe working platform and material storage area for subsequent construction; Integrated construction of pile body and truss module: The main process of this invention is to complete the construction of the entire breach skeleton structure within 6-8 hours through prefabrication on the top of the dike and rapid hoisting. Entry and Closure: The simultaneous entry from both sides significantly shortens the closure time; after closure, the air is immediately sealed to prevent seepage from damaging the seal. 4. Post-construction reinforcement: Through the triple measures of "main body reinforcement + dike protection + mud slurry seepage prevention", a multi-layered protection system is formed to ensure the long-term stability of the dike.

[0019] This invention addresses the industry challenges of traditional dike breach sealing technologies, which suffer from poor structural stability under high flow velocities, slow construction speed, and high dependence on specialized equipment. It achieves a systematic technological breakthrough across five dimensions: stress system, modular design, construction technology, resource adaptation, and safety and reliability. The details are as follows: I. Pioneering a collaborative integrated force-bearing system of "steel pipe piles and scaffolding trusses" (core principle innovation) Breaking away from the traditional separate design where "piles only provide support and trusses only provide restraint," the technology organically integrates the two: steel pipe piles provide vertical bearing capacity and horizontal overturning resistance, resisting water flow impact and lateral pressure from stone and rubble; the scaffolding truss modules simultaneously serve as the restraint skeleton and the lateral connecting components of the steel pipe piles, forming an overall box-shaped load-bearing structure.

[0020] This system increases the overall scour resistance to more than three times that of traditional steel-wood-earth-rock composite dams, effectively solving the problems of easy structural collapse and easy washing away of thrown materials under high flow velocity.

[0021] II. Connectorless rapid assembly design of standardized truss modules (structural and assembly innovation) It adopts a standardized rectangular truss module (5.0m×3.0m×4.0m) prefabricated from general scaffolding steel pipes, with 1.0m×1.0m holes reserved along the length direction to match the spacing of the steel pipe piles. The weight of a single module is less than 2t, and it is compatible with conventional lifting equipment.

[0022] The unique "self-weight + pile body limiting" assembly method without connectors: After the truss module is inserted into the steel pipe pile through the reserved hole, it can be stably positioned by its own weight without welding or bolt connection. The hoisting time of a single module is ≤10 minutes.

[0023] The nodes are connected using universal right-angle / rotary fasteners, with a node spacing of ≤1.0m. The assembly process is simple and can be mastered by ordinary engineering personnel after 2 hours of training.

[0024] 3. A fully waterless operation mode of "prefabrication on the embankment top + ground construction" (innovative construction method) All truss modules are prefabricated on a safe working surface atop the dike, completely avoiding the risks of underwater operations. More than 90% of the construction process is completed on the ground, significantly reducing the risk of personnel injury or death.

[0025] The use of an integrated hoisting and piling machine enables "piling + hoisting" to be used in one machine, eliminating the need to change equipment and greatly reducing the number of equipment to be brought to the site and the time required for relocation.

[0026] The overall framework can be erected in just 6-8 hours, which is more than 40% more efficient than traditional underwater construction methods.

[0027] IV. Complete plugging process flow of "box-type interception + double-sided advance + double airtightness + triple reinforcement" (process system innovation) A standardized process has been established, covering the entire chain from initial protection to subsequent hardening, thus solving the problems of fragmentation and vulnerability in traditional processes. Pre-embankment protection: Use sand and gravel ton bags to quickly form a 1-3m high embankment to suppress water erosion and prevent the opening from widening; Box-shaped space interception: The upstream and downstream double-row pile trusses form an 8m wide box-shaped interception space, which can reduce the water flow velocity at the inlet by 40%-50% and reduce the stone and slag loss rate from the traditional 30%-50% to less than 10%; High-efficiency closure and air sealing: Simultaneous filling from both sides, when the opening is reduced to 5-8m, large stones are thrown in a concentrated manner to close the closure. Within 2 hours after closure, a 1m thick layer of loose soil is used to seal the air and block the seepage channel. The subsequent triple reinforcement: a multi-layered protection system is formed by “main dike repair + construction of the back river side dike + mud injection for seepage prevention”. The mud injection pressure is controlled at 0.2-0.3MPa to fill all gaps and form a dense seepage prevention layer.

[0028] V. Innovation in Generalized Resource Adaptation and Extreme Scenario Adaptability (Engineering Application Innovation) All materials used are general-purpose engineering materials (steel pipe piles, scaffolding steel pipes, ton bags, and stone chips) and conventional construction equipment (excavators, loaders, dump trucks, and integrated hoisting and piling machines). There is no need to rely on special equipment such as piling boats and helicopters, and it can be quickly deployed in remote areas with inconvenient transportation and narrow sites.

[0029] Core materials such as scaffolding steel pipes and steel pipe piles can be reused, reducing emergency rescue costs by more than 30% compared to traditional methods.

[0030] Breakthrough in all performance indicators: From the team's entry to the closure and sealing, it only takes 24-36 hours, which is more than 50% shorter than traditional technology. The success rate of one-time sealing is over 98%, and it can be adapted to extreme hydrological conditions with flow velocity >2m / s and water depth >8m.

[0031] Compared with the prior art, the present invention has the following three important differences: (1) For the first time, a synergistic integrated force system of steel pipe piles and scaffold truss modules was proposed: existing technologies either use steel pipe piles as supports alone or use trusses as retaining structures alone. This invention organically combines the two. The truss module is not only a retaining structure, but also a lateral connecting component of the steel pipe piles, which significantly improves the overall structure's resistance to overturning and scouring. (2) The prefabrication and rapid hoisting of truss modules on the top of the dike were realized: all truss modules were prefabricated on the safe working surface on the top of the dike, avoiding the safety risks of underwater operation. The hoisting time of a single module does not exceed 10 minutes, and the overall construction efficiency is improved by more than 40%. (3) A complete process flow of “box-type interception + rapid advance + double air-tightening” has been formed: the box-type interception space is formed by the upstream and downstream double-row pile truss, and the stone slag material is rapidly advanced and the loose soil + mud slurry double air-tightening is used to solve the problem of material loss and seepage damage under high flow velocity.

[0032] In summary, compared with existing mainstream technologies, the present invention has the following significant advantages: (1) Significantly improved sealing efficiency: It only takes 24-36 hours from the arrival of the emergency team to the closure and sealing, which is more than 50% shorter than the traditional steel-wood-earth-stone composite dam technology. It can efficiently seal the breaches of important dikes with fast water flow and deep water. (2) Significantly enhanced structural stability: The scouring resistance of the integrated stress system is more than 3 times that of the traditional structure, the stone material loss rate is reduced to less than 10%, and the one-time sealing success rate is more than 98%; (3) Wide adaptability: All materials are general engineering materials and conventional construction equipment are used. There is no need to rely on special equipment such as pile driving boats and helicopters. It can be quickly deployed in areas with inconvenient transportation and narrow sites. (4) Good economic efficiency: scaffolding steel pipes, steel pipe piles and other materials can be reused, reducing the cost of emergency rescue by more than 30% compared with traditional methods; the construction process is simple and can be mastered by ordinary engineering personnel after 2 hours of training; (5) High safety: More than 90% of the construction procedures are completed on the top of the dike, and the workers do not need to enter the deep water area of ​​the breach, which significantly reduces the construction safety risk. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the head wrapping protection and work surface preparation process of the present invention; Figure 2 This is a schematic diagram of the steel pipe pile driving process of the present invention; Figure 3 This is a schematic diagram of the hoisting process of the single-sided truss module of the present invention; Figure 4 This is a schematic diagram of the box-shaped structure formed by the assembly of the double-sided truss modules of the present invention; Figure 5 This is a schematic diagram of the stone slag material entry and construction process of the present invention; Figure 6 This is a schematic diagram of the closure and air-sealing process of the present invention; Figure 7 These are three views of the cuboid module configuration of this invention; Figure 8 This is a physical diagram of the cuboid module configuration of the present invention; Figure 9 These are field implementation verification diagrams of the steel pipe piles of this invention; Figure 10 This is a diagram showing the on-site verification of the hoisting of the single-sided truss module of this invention.

[0034] Explanation of reference numerals in the attached drawings: 1-ton bag; 2-dike top; 3-steel pipe pile; 4-integrated lifting and piling machine; 5-scaffolding steel pipe; 6-rectangular truss module; 7-stone and ballast material entry body; 8-loose soil airtight layer; 9-box-type interception space. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0036] This embodiment addresses a breach in a dike with a width of 60m, an average water depth of 7.5m, and a maximum flow velocity of 2.2m / s. The method of this invention is used for sealing the breach, and the specific steps are as follows: Step S1: Breach Monitoring and Situation Assessment Hydrological surveyors used ADCP current meters, depth sounders, and total stations to monitor the breach width, water depth and velocity distribution at different cross-sections, and erosion depth of the embankment every 30 minutes. Monitoring data showed an average flow velocity of 1.0 m / s, a maximum velocity of 2.2 m / s, an average water depth of 8 m, and the breach width was widening at a rate of 0.5 m per hour. Based on the monitoring data, a breach development prediction model was established, determining that a pile spacing of 2.0 m would be used, requiring 24 steel pipe piles, 24 rectangular truss modules (5.0 m × 3.0 m × 4.0 m), and 30,000 m³ of crushed stone. 3 .

[0037] Step S2: Preparation of Emergency Rescue Resources (1) Personnel organization: Six groups were formed, including a command group, a surveying group, a piling group, a truss assembly group, a filling group, and a safety group, with eight people in each group, and they worked in shifts 24 hours a day.

[0038] (2) Material preparation: φ 96 steel pipe piles, each measuring 219mm × 14mm × 6m; φ 500 5m long, 600 4m long, and 750 3m long scaffolding steel pipes (48mm×3.5mm), along with 5000 right-angle couplers and 3000 swivel couplers; 2000 1m×1m×1m ton bags filled with sand and gravel with a particle size of 5-10cm; and 30,000 cubic meters of stone chips with a particle size of not less than 50cm and a single piece weight of ≥50kg. 3 2000 large stones, each weighing ≥100kg; 5000m³ of loose soil. 3 100 tons of bentonite slurry material.

[0039] (3) Equipment configuration: 2 cranes and pile drivers, 4 excavators, 4 loaders, 20 15t dump trucks, 1 ADCP current meter, 1 depth sounder, 2 total stations, and 4 mud pumps.

[0040] Step S3: Collaborative plugging operation of prefabricated pile truss modules S3-1, Head protection and work surface preparation (corresponding to) Figure 1 ) Within two hours of the incident, excavators and loaders were deployed to drop ton bags filled with sand and gravel onto the slopes of the dike on both sides of the breach, forming a 1.5-meter-high embankment that effectively prevented further collapse of the dike. Simultaneously, the tops of the dike on both sides of the breach were leveled, extending 6 meters to each side to create an 18-meter-wide construction platform. This ensured two-way passage for dump trucks and cranes and provided sufficient space for material storage.

[0041] S3-2, Integrated construction of pile body and truss module (corresponding to) Figures 2-4 ) According to the emergency response plan, a row of steel pipe piles 3 was installed on both sides of the breach, on the top of the dike, and upstream and downstream of the breach area. A combined lifting and piling machine 4 was used to vertically drive the steel pipe piles into the dike foundation on both sides of the breach and into the breach itself, with a driving depth of 4m and a penetration depth of 2m into the stable soil layer. The spacing between the upstream and downstream rows of steel pipe piles was 8m in the direction of water flow and 2m perpendicular to the direction of water flow, for a total of 24 steel pipe piles.

[0042] like Figure 8 As shown, during pile driving, the truss assembly team used scaffolding steel pipes 5 and prefabricated rectangular truss modules 6 with couplers on the dike crest working surface. Each rectangular truss module measures 5.0m × 3.0m × 4.0m, with two 1.0m × 1.0m holes pre-drilled along its length, with a center-to-center distance of 2m, matching the spacing of the steel pipe piles. The nodes are connected using right-angle couplers and swivel couplers, with a node spacing of 1.0m. The total weight of a single module is approximately 1.8t. At the transition between the breach ends and the dike head, four rectangular truss modules were prefabricated.

[0043] like Figure 9 and 10 As shown, a 25t integrated hoisting and piling machine was used to sequentially lift the prefabricated truss modules to their corresponding positions. Steel pipe piles 3 were then inserted through pre-drilled holes. After leveling the modules, the truss modules and steel pipe piles, as well as the truss modules themselves, were positioned solely by their own weight and the piles' constraint, without any connecting parts. The assembly of 48 rectangular truss modules in two rows (upper and lower) was completed sequentially, forming an integrated box-type interception structure with two rows of pile trusses, creating an 8m wide box-type interception space 9 in the middle. This entire process took only 7 hours from start to finish.

[0044] S3-3, Advancement and Closure (corresponding to...) Figures 5-6 ) Twenty dump trucks were organized to simultaneously dump stone chips from both sides of the breach into the box-shaped interception space 9, gradually advancing to form the stone chip containment body 7. Excavators were used for leveling and compaction to ensure the stability of the containment body. When the opening between the two containment bodies narrowed to 6 meters, the dumping of ordinary stone chips was stopped, and large stones were dumped in a concentrated manner. The closure was completed in just 45 minutes.

[0045] Within 1.5 hours of the closure, dump trucks were used to dump loose soil into the upstream pile truss, forming a 1.2m thick loose soil airtight layer 8. This process was gradually advanced from upstream to downstream to ensure the airtight layer remained continuous and compact. After the airtight layer was completed, personnel were assigned to monitor the seepage 24 hours a day, and no significant leakage was found.

[0046] Step S4, Post-construction reinforcement (1) Reinforcement of the main body of the dike: Conduct a comprehensive inspection of the dike within 50m on both sides of the breach, and backfill and compact the collapsed and cracked parts with earthwork to restore the original design cross section of the dike.

[0047] (2) Construction of a new moon dike: A new moon dike is constructed 12m away from the original dike toe on the back side of the dike. The height of the moon dike is the same as that of the original dike, the top width is 4m, the slope is 1:2, and the overlap length with both ends of the original dike is 15m. The filling is carried out by "advancing" from both ends to the middle at the same time.

[0048] (3) Mud injection for seepage prevention: The prepared bentonite mud is injected into the internal voids of the pile truss structure and the voids between the moon dike and the original dike using a mud pump. The mud pressure is controlled at 0.25 MPa until the mud continuously overflows from the surface. After the mud solidifies, it forms a dense seepage prevention layer, which further improves the seepage prevention performance of the dam.

[0049] (4) Acceptance and monitoring: After the reinforcement is completed, the embankment will be fully accepted and a special person will be assigned to conduct continuous monitoring for one month, focusing on monitoring the settlement, seepage and displacement of the embankment. All indicators meet the design requirements.

[0050] In this embodiment, it took only 32 hours from the arrival of the emergency rescue team to the closure and sealing of the dam, which is nearly half the time compared to the traditional steel-wood-earth-rock composite dam technology. The loss rate of rock debris was only 7.6%, achieving remarkable emergency rescue results.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A modular assembly method for prefabricated pile trusses for breach sealing, characterized in that: Includes the following steps: S1. Breach monitoring and situation assessment: Real-time monitoring of the dynamic changes in the breach width, water depth and flow velocity distribution, and water scouring characteristics; establishing a breach development prediction model based on monitoring data; and formulating emergency response plans. S2. Emergency Rescue Resource Preparation: Establish a professional emergency rescue team and prepare sealing materials and construction equipment; the sealing materials include steel pipe piles, scaffolding steel pipes, ton bags filled with sand and gravel, stone chips and loose soil; the construction equipment includes a hoisting and piling machine, excavator, loader, dump truck with a load capacity of ≥10t and surveying instruments; S3. Collaborative plugging operation of prefabricated pile truss modules: S3-1, Head protection and work surface preparation: Use ton bags filled with sand and gravel to reinforce the foundation and protect the toe of the dike on both sides of the breach, forming a head protection with a height of 1-3m; level and expand the top of the dike on both sides of the breach, and construct a construction platform with a width of not less than 15m. S3-2, Integrated construction of pile body and truss module: A row of steel pipe piles is driven into the top of the dike on both sides of the breach and upstream and downstream of the breach area, with a spacing of 8m between the two rows of steel pipe piles in the direction of water flow; scaffolding steel pipe truss modules are prefabricated on the working surface of the dike top, and then the truss modules are hoisted and assembled with the upstream and downstream steel pipe piles respectively to form an integrated box-type interception structure of upstream and downstream double-row pile truss. S3-3, Advancement and Closure: Simultaneously from both sides of the breach, stone chips are poured into the middle between the integrated box-type interception structure of the upstream and downstream pile trusses, gradually advancing to form an advance body until closure; after closure, loose soil is immediately thrown into the upstream pile truss to form a closure layer with a thickness of not less than 1m to block the seepage channel. S4. Post-construction reinforcement: Strengthen the main structure of the dike, build a crescent dike on the back side of the dike, and inject mud into the gaps inside the integrated pile-truss structure and the gaps between the crescent dike and the original dike to fill the gaps and form a dense seepage-proof layer.

2. The modular assembly method for prefabricated pile truss for breach sealing according to claim 1, characterized in that: In step S2, the steel pipe pile has a diameter of 219mm, a wall thickness of 14mm, and a length of 6m. If the length is insufficient, it can be welded on site. The scaffolding steel pipe has a diameter of 48mm and a wall thickness of 2.5mm, 2.75mm, or 3.5mm.

3. The modular assembly method for prefabricated pile truss for breach sealing according to claim 1, characterized in that: In step S3-2, the driving depth of the steel pipe piles shall not be less than 3m, and the depth of penetration into the stable soil layer shall not be less than 1.5m; the spacing of the steel pipe piles perpendicular to the water flow direction shall be determined according to the water flow velocity: when the flow velocity is >1m / s, the pile spacing shall be 2.0m; when the flow velocity is <1m / s, the pile spacing shall be 3.0m.

4. The modular assembly method for prefabricated pile truss for breach sealing according to claim 1, characterized in that: In step S3-2, the scaffolding steel pipe truss module is a cuboid; the dimensions of the cuboid module are 5.0m×3.0m×4.0m (length×width×height), with a 1.0m×1.0m hole reserved along the length direction, the center distance of the hole matching the spacing of the steel pipe piles, and the total weight of a single module <2t.

5. The modular assembly method for prefabricated pile truss for breach sealing according to claim 1, characterized in that: In step S3-2, the scaffold steel pipes are connected to form truss modules using right-angle couplers and swivel couplers, with a node spacing of no more than 1.0m. After the truss modules are inserted into the steel pipe piles through the reserved holes, no connecting parts are provided between the truss modules and the steel pipe piles, and the truss modules are positioned solely by their own weight and the pile body.

6. The modular assembly method for prefabricated pile truss for breach sealing according to claim 1, characterized in that: In step S3-3, the particle size of the stone slag is not less than 50cm and the weight of a single piece is ≥50kg; when the width of the opening is reduced to 5-8m, large stones with a particle size of not less than 100cm and a weight of ≥100kg are concentrated and thrown to close the gap; the soil sealing operation is completed within 2 hours after the gap is closed.

7. The modular assembly method for prefabricated pile truss for breach sealing according to claim 1, characterized in that: In step S4, the height of the moon dike is level with the top of the original dike, the top width is 3-5m, the slope is 1:2, and the overlap length with both ends of the original dike is not less than 10m; the mud injection pressure is controlled at 0.2-0.3MPa until the mud continuously overflows from the surface.

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