Linear engineering assembly type combined calandria construction method

Abstract

The invention discloses a linear engineering assembly type combined calandria construction method. The construction method specifically comprises the following steps of prefabrication of calandria, excavation of a construction area, arrangement of a cushion layer, installation of the calandria, treatment of connectors and backfilling. The prefabricated standard length of the calandria is 6 meters, and the calandria is provided with connecting holes and spiral compression-resistant ribs; the digging depth of the groove is 1.2-1.5 times of the outer diameter of the calandria, and a water collecting well and drainage measures are arranged; the surface of the cushion layer is provided with a drainage slope and a drainage groove; a QY25K type crane is used for hoisting the calandria, and the alignment precision is ensured; multiple sealing is performed at the joint; and performing layered compaction and settlement monitoring in the backfilling process. According to the construction method, the construction efficiency and quality are improved, and the influence on the environment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of municipal engineering construction, and in particular to a linear engineering assembled combined pipe construction method. Background Art

[0002] With the rapid advancement of urbanization, the layout of underground pipelines in municipal engineering projects is becoming more and more dense, and the construction demand is increasing. The traditional cast-in-place pipe construction method usually requires multiple processes such as on-site excavation, pipe installation, and concrete pouring. This process is not only complicated, but also easily affected by weather and site conditions, resulting in a long construction period and a large workload. In addition, noise pollution and dust pollution are often generated during the construction process, which interferes with the surrounding environment and the daily lives of residents, especially in urban areas or densely populated areas, where the impact of construction on traffic is particularly obvious.

[0003] In traditional methods, the overall connection and stability of the pipes are poor, especially in long-distance linear engineering construction, the sealing performance of the pipe connection interface is difficult to guarantee, which easily leads to leakage problems. In addition, the cast-in-place process has high requirements for the construction site, requiring a lot of excavation and material stacking, occupying a large space, which is not conducive to the efficient use of resources. At the same time, because the connection quality of the pipes is difficult to control, the traditional construction method is powerless when dealing with complex geological conditions, and it is easy to produce quality defects, such as pipeline displacement, foundation settlement and other problems, which bring difficulties to the subsequent maintenance and repair.

[0004] With the continuous improvement of environmental protection and construction quality requirements, existing technologies can no longer meet the needs of modern municipal engineering. A more efficient and environmentally friendly construction method is urgently needed to shorten the construction period, reduce manpower and material investment, and improve the overall quality and stability of drainage pipes. Summary of the invention

[0005] The purpose of the present invention is to provide a linear engineering assembled combined pipe construction method, which has the advantages of shortening the construction period, improving the construction quality, reducing the environmental impact and saving resources, and solves the problems of low construction efficiency, unstable construction quality and great impact on the surrounding environment in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solution: a linear engineering assembled combined pipe construction method, comprising the following steps:

[0007] S1. Prefabrication of pipes: Standardized prefabrication of pipes is carried out in the factory, and the shape, specification and connection structure of pipes are set according to construction requirements to meet the technical requirements of installation and connection;

[0008] S2. Excavation of the construction area: trench excavation shall be carried out in the construction area according to the design standards. The excavation depth and width shall comply with the installation dimensions of the drainage pipes. Slope support and drainage measures shall be implemented to ensure the stability of the excavation area.

[0009] S3. Setting of cushion layer: Lay cushion layer materials that meet the design specifications at the bottom of the trench to ensure the stability and flatness of the installation of the drainage pipes;

[0010] S4. Installation of drainage pipes: transport the prefabricated drainage pipes to the construction site and install them in the grooves in the predetermined order and elevation, ensuring that the positions of the drainage pipes are aligned and fixed;

[0011] S5. Interface processing: seal and structurally reinforce the connection interfaces of adjacent pipes to ensure the waterproof performance of the interfaces and the stability of the connections;

[0012] S6. Backfill: After the drainage pipes are installed and accepted, the trenches shall be backfilled in layers. The backfill materials and thickness shall meet the design requirements to restore the original state of the construction area.

[0013] Preferably, in the prefabrication of the row pipes, the standard length of the row pipes is 6 meters, and four connecting holes with a diameter of 38 mm are set at both ends of each section of the row pipe at a distance of 180 mm from the end face, and spiral compression ribs with a pitch of 50 mm are evenly arranged around the connecting holes.

[0014] Preferably, the trench excavation depth is 1.2 to 1.5 times the outer diameter of the drainage pipe, the slope angle is not greater than 33 degrees, and a 0.5-meter-deep water collection well is set every 10 meters at the bottom of the trench, and a 50-mm-thick gravel layer is laid at the bottom of the water collection well.

[0015] Preferably, the cushion layer is set up with medium-coarse sand with a particle size between 0.5 and 4.75 mm, the cushion layer thickness is precisely controlled to be 100 mm, and the density after compaction is not less than 95% of the standard density; a drainage slope of 1% to 2% is set on the surface of the cushion layer, and drainage grooves with a width of 100 mm and a depth of 50 mm are set on both sides of the cushion layer.

[0016] Preferably, the installation of the row pipes is carried out section by section in a sequential order, and the installation position deviation of each section of the row pipe does not exceed ±5mm;

[0017] The QY25K crane is used to hoist the pipes, and the hoisting speed is controlled to no more than 3 meters per minute. During the installation process, a wire alignment tool is used to ensure that the alignment of the pipes is not less than 99%.

[0018] Preferably, the alignment and positioning of the row pipe installation includes providing reserved guide chain tightening holes on both sides of the row pipe for tightening and positioning, and the diameter of each guide chain tightening hole is 25 mm and the spacing is 2 meters;

[0019] When installing the pipes, use a chain guide tool to tighten and fix the adjacent pipes, and after installation, use C30 shrinkage-compensating fine stone concrete to fill the interface area.

[0020] Preferably, the interface is processed by using arc bolts of M27 specification, and the bolt tightening torque at each interface is 80 to 100 Nm;

[0021] Use 3 to 5mm thick two-component polysulfide sealant at the interface seal, and paste 40mm wide water-swellable rubber on the inside, with a swelling rate of at least 150%;

[0022] A 10 mm thick nitrile cork rubber sheet is also provided on the outside of the interface.

[0023] Preferably, during the backfilling process, the thickness of each layer of backfill soil is controlled between 200 and 300 mm, and a YZ25 roller is used for compaction, and the density after compaction reaches 93% or more;

[0024] Use fine-grained soil with a particle size of less than 20 mm to backfill within 50 cm of the top of the drainage pipe, and use pure fine sand as the cover layer;

[0025] During backfilling and compaction, several foundation settlement observation points are set up with a spacing of 20 to 30 meters between each observation point, and real-time monitoring is carried out using a settlement meter.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention significantly reduces the process and complexity of on-site construction by setting up standardized prefabricated pipes and on-site assembly construction technology, achieves a rapid installation effect similar to "building blocks", greatly shortens the construction period, reduces the investment of manpower and material resources, and saves construction costs.

[0028] 2. The use of arc bolt connection and multiple sealing and waterproofing technologies, including the application of two-component polysulfide sealing paste, water-swelling rubber and nitrile cork rubber sheet, ensures the sealing performance and overall structural stability of the drainage pipe interface, effectively prevents leakage at the interface, and improves the long-term durability of the project.

[0029] 3. The cushion layer setting and drainage measures in the present invention improve the drainage performance by setting a drainage slope on the cushion layer surface and drainage grooves on both sides, prevent foundation softening or drainage pipe displacement caused by water accumulation in the cushion layer, and ensure the installation stability of the drainage pipe and the long-term stability of the foundation.

[0030] 4. The environmental friendliness of on-site construction has been significantly improved. The use of prefabricated construction methods has reduced the area of ​​excavated earth and material stacking, reduced the noise and dust pollution generated during the construction process, and minimized the impact on the surrounding environment and traffic, which meets the development requirements of energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is an overall flow chart of the linear engineering assembled combined pipe arrangement construction method of the present invention;

[0032] Figure 2 It is a schematic diagram of the prefabrication and connection hole arrangement of the row pipe of the present invention;

[0033] Figure 3 It is a schematic diagram of the trench excavation and drainage method of the present invention;

[0034] Figure 4 It is a schematic diagram of the cushion layer setting and drainage measures of the present invention;

[0035] Figure 5 This is a schematic diagram of the pipe installation process of the present invention;

[0036] Figure 6 It is a schematic diagram of the alignment, positioning and fixing method of the pipe arrangement of the present invention;

[0037] Figure 7 It is a schematic diagram of the sealing and reinforcement method of the pipe connection of the present invention;

[0038] Figure 8 It is a schematic diagram of the backfilling method of the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figures 1 to 8 The present invention provides a technical solution: a linear engineering assembled combined pipe construction method, comprising the following steps:

[0041] S1. Prefabrication of pipes: Standardized prefabrication of pipes is carried out in the factory, and the shape, specification and connection structure of pipes are set according to construction requirements to meet the technical requirements of installation and connection;

[0042] S2. Excavation of the construction area: trench excavation shall be carried out in the construction area according to the design standards. The excavation depth and width shall comply with the installation dimensions of the drainage pipes. Slope support and drainage measures shall be implemented to ensure the stability of the excavation area.

[0043] S3. Setting of cushion layer: Lay cushion layer materials that meet the design specifications at the bottom of the trench to ensure the stability and flatness of the installation of the drainage pipes;

[0044] S4. Installation of drainage pipes: transport the prefabricated drainage pipes to the construction site and install them in the grooves in the predetermined order and elevation, ensuring that the positions of the drainage pipes are aligned and fixed;

[0045] S5. Interface processing: seal and structurally reinforce the connection interfaces of adjacent pipes to ensure the waterproof performance of the interfaces and the stability of the connections;

[0046] S6. Backfill: After the drainage pipes are installed and accepted, the trenches shall be backfilled in layers. The backfill materials and thickness shall meet the design requirements to restore the original state of the construction area.

[0047] Furthermore, in the present invention, prefabrication of the pipes is a key step in realizing the construction of assembled combined pipes. The pipes are produced in a standardized manner in the factory to ensure rapid installation and quality reliability at the construction site.

[0048] Standardized production of pipes The pipes are prefabricated in the factory, and the standard length of the pipes is 6 meters. This length is selected based on the pipe requirements of municipal engineering, which not only ensures sufficient rigidity of the pipes, but also facilitates transportation and on-site lifting. The pipes are made of high-strength concrete to enhance their bearing capacity and durability. In order to ensure the consistency and interchangeability of each section of the pipe, the size and shape of all pipes are produced according to a unified mold to achieve standardization and mass production.

[0049] The connection holes and spiral compression ribs are set up. Four connection holes with a diameter of 38 mm are set at both ends of each pipe section, 180 mm from the end face. These connection holes are set up to achieve a stable connection between the pipes, which is convenient for quick installation using arc bolts at the construction site. The diameter and position of the connection holes are precisely designed to ensure the accuracy of installation and the firmness of the connection.

[0050] Around the connection hole, spiral compression ribs with a pitch of 50mm are evenly arranged. The setting of spiral compression ribs helps to increase the local strength of the end of the pipe and prevent structural damage caused by concentrated force during installation and later use. The compression ribs are arranged in a spiral form, which can effectively disperse local stress and further improve the compression and deformation resistance of the pipe.

[0051] During the prefabrication of the pipe, embedded parts for hoisting are also set, that is, the reserved lifting rings on the top of the pipe. The lifting rings are made of two Q235 round steels with a diameter of 25mm and welded to the steel skeleton of the pipe to ensure safety and stability during hoisting. The four lifting rings reserved on each section of the pipe allow the pipe to be evenly stressed during hoisting at the construction site, avoiding damage to the pipe due to single-point stress.

[0052] Prefabrication quality control: In order to ensure the overall quality of the pipes, the factory strictly follows quality standards during the prefabrication process, including the concrete mix ratio, the dimensional accuracy of the molds, and the position accuracy of the connection holes. After each section of the pipe is prefabricated, it is inspected for size and tested for compressive strength to ensure that it meets the design requirements. Unqualified pipes will be reworked or scrapped to prevent unqualified products from entering the construction site.

[0053] Transportation and storage of pipes: Prefabricated pipes need to undergo necessary curing before leaving the factory to ensure the strength and durability of the concrete. After curing, the pipes will be stored and transported in the prescribed stacking method. Soft cushions are used to separate the pipes to avoid collision or damage during transportation. Special brackets are used to fix the pipes during transportation to ensure the safety and stability of the pipes during road transportation.

[0054] By prefabricating the pipes in a standardized manner in the factory, the complexity and duration of on-site construction can be greatly reduced. The standardized production of prefabricated pipes ensures the dimensional accuracy and installation repeatability of each section of the pipes, avoiding the quality instability caused by on-site pouring or temporary production of pipes. The use of spiral compression ribs to enhance the strength around the connection holes effectively prevents damage caused by concentrated force, making the overall connection of the pipes more secure. The setting of embedded lifting rings provides convenient conditions for subsequent lifting and on-site installation, improving the safety and efficiency of construction.

[0055] Furthermore, in the linear engineering assembled combined pipe construction method of the present invention, excavation of the construction area is one of the basic steps for pipe installation. Through reasonable excavation depth and slope design, the stability of the groove and the smooth installation of the pipe can be effectively ensured.

[0056] The depth and width of the trench excavation are designed. The excavation depth of the trench is determined according to the outer diameter of the drainage pipe, which is usually 1.2 to 1.5 times the outer diameter of the drainage pipe. The design of this depth range takes into account the installation space of the drainage pipe, the setting of the cushion layer, and the thickness of the backfill to ensure the stability of the drainage pipe in the trench after installation. In addition, the width of the trench is also set according to the diameter of the drainage pipe and the needs of the construction operation. It is usually about 1 meter larger than the diameter of the drainage pipe to facilitate the installation, adjustment and connection of the drainage pipe.

[0057] Slope support measures: In order to prevent slope collapse during trench excavation, slope support is carried out by slope reduction. The slope reduction angle is not greater than 33 degrees, and the specific slope reduction angle can be adjusted appropriately according to the soil conditions on site. If the geological conditions in the construction area are poor, such as soft soil or loose sand, additional support measures may be required, such as the use of supporting structures such as steel sheet piles or soil nail walls to ensure the stability of the slope. While slope reduction support is in place, drainage should also be carried out on the top of the slope to prevent rainwater from seeping in and causing the slope to soften and collapse.

[0058] Drainage measures: In order to ensure that the trench is dry during construction and to prevent water accumulation from affecting the construction quality, a water collection well is set up every 10 meters at the bottom of the trench. The depth of the water collection well is 0.5 meters, which can effectively collect the accumulated water in the trench. In order to enhance the drainage effect of the water collection well, a 50mm thick gravel layer is laid at the bottom of the well. The gravel layer can improve the drainage efficiency and prevent the bottom of the water collection well from being blocked by mud. In addition, according to construction needs, a drainage pump can also be set up in the water collection well to drain the accumulated water out of the trench and keep the construction area dry.

[0059] Safety control during trench excavation: During trench excavation, a series of safety control measures need to be taken to prevent accidents. These include but are not limited to the following:

[0060] Before excavation, conduct geological survey of the construction area to understand the soil conditions and formulate a reasonable excavation plan.

[0061] Excavation should be carried out in layers to avoid instability caused by large-scale excavation at one time. The depth of each excavation should not exceed 1 meter, and slope stability checks should be carried out during the excavation process.

[0062] Set up safety signs and guardrails around the trench to prevent non-construction personnel from entering the dangerous area.

[0063] During the excavation process, construction workers should be equipped with protective equipment, and regularly check the stability of the slope and deal with any abnormal situation in a timely manner.

[0064] After the trench is excavated, it is necessary to check the depth, width, slope angle and the setting of the water collection well to ensure that all dimensions meet the design requirements. If there are any places that do not meet the design standards, appropriate corrections should be made to ensure that the installation of the drainage pipe can proceed smoothly.

[0065] The trench excavation process of the present invention combines geological conditions and the requirements of drainage pipe installation, and ensures the stability of the trench during the construction process through reasonable depth and width design. The use of slope support and drainage measures can effectively prevent slope collapse and trench water accumulation, improve the safety of construction and the stability of the construction environment. The drainage design of the water collection well and gravel layer ensures that the trench is dry during excavation and drainage pipe installation, helps prevent the softening of the drainage pipe foundation, and creates good construction conditions for subsequent cushion layer laying and drainage pipe installation.

[0066] Furthermore, in the linear engineering assembled combined pipe construction method of the present invention, the provision of the cushion layer is a key step to ensure the stable installation of the pipes. The cushion layer supports the weight of the pipes and ensures their accurate position by providing a flat and stable foundation.

[0067] The choice of cushion material is medium-coarse sand with a particle size between 0.5 and 4.75 mm. This material has good permeability and compaction properties and can form a stable base layer after compaction. The particle size range of medium-coarse sand helps prevent the migration of soil particles while maintaining a certain drainage capacity to avoid water accumulation on the drainage pipe foundation.

[0068] The thickness of the cushion layer is precisely controlled to be 100mm, which is determined according to the design load-bearing requirements of the drainage pipe and the foundation conditions. The thickness of 100mm can effectively buffer the pressure distribution between the drainage pipe and the foundation, and reduce the impact of uneven foundation settlement on the drainage pipe. In the actual construction process, the thickness of the cushion layer is measured by using a ruler and a thickness detection tool to ensure that the thickness of each section of the cushion layer is consistent, so as to ensure the smooth installation of the drainage pipe.

[0069] Compacting the cushion layer. After the cushion layer is laid, it needs to be compacted by mechanical equipment to achieve a compaction degree of not less than 95% of the standard density. The purpose of compaction is to improve the bearing capacity of the cushion layer and reduce the displacement of the pipes during operation due to foundation settlement or vibration. During the compaction process, vibrating compaction equipment such as vibrating rammers or vibrating rollers are usually used to perform multiple round trips until the design density requirements are met. At the same time, over-compacting should be avoided during the compaction process to prevent the formation of over-hardened areas on the cushion layer surface.

[0070] The drainage slope is set to ensure the drainage performance of the cushion layer. A drainage slope of 1% to 2% is set on the cushion layer surface. This slope setting helps to guide the water flow during the use of the drainage pipe after installation, so that the water can be naturally discharged from the cushion layer surface, and prevent the water from accumulating above the cushion layer and causing the foundation to soften. The slope setting needs to be achieved by adjusting the flatness of the cushion layer. During construction, a level or slope detection tool is used for monitoring and adjustment.

[0071] The drainage grooves are set up on both sides of the cushion layer with a width of 100mm and a depth of 50mm. These drainage grooves are used to collect and discharge excess water on the surface of the cushion layer, especially in the rainy season or when there is a lot of groundwater, so that the accumulated water on the surface of the cushion layer can be quickly drained away to avoid adverse effects on the installation of drainage pipes and the stability of the cushion layer. The bottom of the drainage groove should be kept flat and connected to the drainage slope of the cushion layer surface to ensure smooth water flow.

[0072] During the laying and inspection process of the cushion layer, after the cushion layer is laid, its thickness, compaction, slope and the location of the drainage trough need to be fully inspected to ensure that it meets the design specifications and construction requirements. If it is found during the inspection that the cushion layer is partially uneven or lacks density, it should be supplemented or re-compacted in time to ensure that the overall quality of the cushion layer meets the requirements.

[0073] The cushion layer of the present invention is set by selecting suitable medium-coarse sand as the material and reasonably controlling the thickness and compaction of the cushion layer to provide a stable foundation with good drainage capacity. By setting the drainage slope on the cushion layer surface and the drainage grooves on both sides, the drainage effect of the cushion layer is enhanced, the accumulation of water above the cushion layer is prevented, and the risk of foundation softening caused by water is reduced.

[0074] Furthermore, in the linear engineering assembled combined pipe construction method of the present invention, the installation of the pipes is a key step in achieving the connection and fixation of the pipes. The position accuracy and structural stability of the pipes during construction are ensured through reasonable installation sequence, hoisting method and alignment measures.

[0075] Transportation and site preparation of the pipes. When transporting the prefabricated pipes from the factory to the construction site, the pipes should be fixed with special transport brackets to prevent collision and damage during transportation. After the pipes arrive at the site, they are placed in the designated storage area and arranged in the order of installation to facilitate subsequent lifting and installation operations. Before on-site installation, the appearance, embedded parts and connection hole positions of each section of the pipe are checked to ensure that they meet the design requirements.

[0076] Installation order and method: The installation of the pipes is carried out section by section in the order of sequence, that is, starting from one end and installing section by section to the other end. After each section of the pipe is installed, the elevation and position of the pipe need to be re-measured to ensure that the deviation of the installation position does not exceed ±5mm. If the deviation is found to be out of range, it must be adjusted until the design requirements are met. The section-by-section installation method can ensure the precise connection and high alignment between the pipes, avoiding the cumulative error caused by installing too many pipes at one time.

[0077] Operation and safety control of hoisting. The QY25K crane is used for the hoisting of the pipes. The selection of the crane is based on the weight and size of the pipes to ensure that the lifting equipment has sufficient stability and safety during the hoisting process. During hoisting, the hoisting device is hung on the reserved lifting rings of the pipes. Each section of the pipe should use at least 4 lifting points to evenly distribute the load. The hoisting speed is controlled to no more than 3 meters per minute to reduce the swing and impact force of the pipes in the air and prevent safety hazards caused by excessive speed during the hoisting process. During the hoisting process, there must be a dedicated person to command to ensure the accuracy of the crane operation and the safety of the on-site construction personnel.

[0078] During the installation process, the alignment tool is used to ensure that the alignment of the pipes is not less than 99%. The alignment tool can help construction workers check the straightness and horizontality of the pipes when installing each section of the pipes, so that the pipes remain neat and consistent after installation.

[0079] To further ensure the alignment and fixation of the pipes, reserved guide chain tightening holes are set on both sides of the pipes for tightening and positioning. The diameter of each guide chain tightening hole is 25mm, and the hole spacing is 2 meters. When installing the pipes, use the guide chain tool to connect the guide chain tightening holes of adjacent pipes, and tighten and fix them through the tightening device. This method can effectively eliminate the gaps between the pipes and prevent displacement and looseness during operation.

[0080] Filling treatment of the interface: After the installation of the drainage pipe is completed, the drainage pipe interface area needs to be filled to increase the sealing and stability of the interface. The specific operation includes filling the interface area with C30 shrinkage compensating fine stone concrete. Shrinkage compensating concrete has good shrinkage compensation performance, which can offset part of the shrinkage stress during the concrete hardening process and avoid cracks in the interface caused by concrete shrinkage. After the concrete is filled, necessary maintenance should be carried out to ensure that the strength and adhesion of the filling material meet the design requirements.

[0081] The pipe installation of the present invention ensures accurate installation position and firm connection of the pipes through reasonable hoisting and alignment positioning methods. The segment-by-segment installation and real-time measurement method helps to control the installation accuracy of each section of the pipes, avoiding the alignment problem caused by cumulative errors in traditional methods. By using the guide chain tightening tool and setting the guide chain tightening hole, accurate positioning and firm connection of the pipes are achieved, and the overall stability of the pipes is improved.

[0082] In addition, filling the interface area after installation can effectively eliminate the safety hazards caused by gaps and unevenness at the connection, and enhance the overall strength and sealing of the drainage system. The use of C30 shrinkage-compensating fine stone concrete helps to improve the durability and crack resistance of the interface filling material.

[0083] Furthermore, in the linear engineering assembled combined pipe construction method of the present invention, the processing of the interface is a key step to ensure the waterproof performance and structural stability of the pipe system. By adopting multiple waterproof and structural reinforcement measures, the sealing effect of the interface and the firmness of the connection can be effectively improved.

[0084] The connection of arc bolts, the interface of adjacent pipes is connected with arc bolts of M27 specification. The choice of arc bolts is based on its high strength and adaptability, which can provide sufficient tightening force when connecting pipes, thereby improving the stability of the interface. At least 4 arc bolts are set at each interface to evenly distribute the connection force, and the tightening torque of the bolts is controlled between 80 and 100 Nm to ensure that the bolt connection can achieve the necessary tightening effect without damaging the pipe interface.

[0085] Application of two-component polysulfide sealing paste: 3 to 5 mm thick two-component polysulfide sealing paste is used to fill the interface seal. Two-component polysulfide sealing paste is a sealing material with good elasticity and durability, suitable for long-term exposure to environments with large humidity changes. The filling of sealing paste can effectively fill the gaps at the interface and prevent moisture penetration. At the same time, the sealing paste has a certain degree of flexibility and can adapt to the slight deformation of the pipe with temperature changes, thereby maintaining a long-term sealing effect.

[0086] The use of water-swellable rubber, a 40mm wide water-swellable rubber is pasted on the inside of the interface. This rubber material will expand rapidly when it comes into contact with water, with an expansion rate of at least 150%. The function of the water-swellable rubber is to automatically expand and fill the gap when water contacts the interface, forming an additional waterproof barrier, thereby enhancing the sealing performance of the interface. This adaptive waterproof material can compensate for the slight gap changes that may exist at the interface and prevent water leakage.

[0087] The reinforcement of the nitrile cork rubber sheet is also provided on the outside of the interface with a thickness of 10 mm. The nitrile cork rubber sheet has good oil resistance, wear resistance and waterproof performance, and can provide further protection and reinforcement for the interface. Its elastic characteristics enable it to absorb part of the energy when the pipe is subjected to external impact or vibration, reducing the impact force on the interface, thereby improving the overall stability and durability of the interface.

[0088] The construction process of interface processing and the specific construction steps of interface processing are as follows:

[0089] First, clean the surface of the interface to ensure that there is no dust, oil or other impurities that may affect the sealing effect.

[0090] Secondly, insert the M27 arc bolt into the interface connection hole according to the designed position, and tighten it in sequence according to the specified tightening torque (80 to 100 Nm).

[0091] Then, evenly apply 3 to 5 mm thick two-component polysulfide sealant on the inside of the interface, making sure that the sealant completely covers the interface gap.

[0092] Then, stick a 40mm wide water-swellable rubber on the inner side of the sealant and evenly stick it around the perimeter of the interface.

[0093] Finally, a 10 mm thick nitrile cork rubber sheet is covered on the outside of the interface and fixed to the outer surface of the interface using a special adhesive to ensure a tight bond between the rubber sheet and the outer wall of the drainage pipe.

[0094] The interface treatment of the present invention forms a complete interface sealing system by adopting multiple waterproof and reinforcement measures of arc bolt connection, two-component polysulfide sealing paste, water-swelling rubber and nitrile cork rubber sheet. The arc bolt connection ensures the structural strength of the interface, the sealing paste fills the interface gap, the water-swelling rubber provides an adaptive waterproof function, and the nitrile cork rubber sheet provides additional reinforcement and protection for the interface.

[0095] Furthermore, in the linear engineering assembled combined pipe construction method of the present invention, backfilling is an important step after the pipe installation is completed. The stability and safety of the pipe can be effectively guaranteed through reasonable backfilling process and material selection.

[0096] Preparation for backfilling: After the pipes are installed and accepted, the first thing to do is to clean up the debris, water and other factors that may affect the quality of backfilling in the trench. Check the foundation pit and trench during the pipe installation process to ensure that there are no abnormalities, and prepare backfill materials and construction equipment that meet the design requirements in order to proceed to the next step of layered backfilling.

[0097] Layered backfilling process: The backfilling process is carried out in layers. The thickness of each layer of backfill soil is controlled between 200 and 300 mm. This thickness range can reduce the number of layered construction and improve construction efficiency while ensuring effective compaction. The backfill material should be laid evenly in layers to avoid excessive backfill soil accumulation that cannot be evenly compacted.

[0098] Compaction method and compaction control, use YZ25 roller to compact each layer of backfill soil, and ensure that the compaction of each layer reaches 93% or above. The purpose of compaction is to improve the density and bearing capacity of the soil, reduce the settlement of the soil layer above the drainage pipe, and avoid deformation or displacement of the drainage pipe due to loose soil layer. When compacting, the roller should move back and forth along the longitudinal direction of the trench, covering the entire backfill area, and appropriately increase the number of compaction times, especially on both sides of the drainage pipe, to ensure the compaction effect of the surrounding soil.

[0099] Selection and covering of fine-grained soil: fine-grained soil with a particle size of less than 20 mm is used for backfill within 50 cm of the top of the drainage pipe. This material has good compactness and water permeability, and can effectively reduce the impact and wear of large particles on the drainage pipe and protect the drainage pipe from damage. In addition, a layer of pure fine sand is laid on the fine-grained soil as a covering layer to further improve the flatness and uniformity of the soil layer above the drainage pipe and reduce the unevenness of ground settlement.

[0100] Foundation settlement observation: In order to monitor the foundation settlement during and after backfilling in real time, several foundation settlement observation points are set during the backfilling and compaction process, with the spacing between each observation point being 20 to 30 meters. The setting of settlement observation points can monitor the settlement changes of the entire backfill area so that remedial measures can be taken in time to prevent damage to drainage pipes caused by settlement. Use a settlement meter to monitor the observation points in real time, record the settlement data of each observation point, and analyze its change trend to ensure that the density of the backfill soil and the stability of the foundation meet the design requirements.

[0101] Inspection and adjustment after backfilling is completed. After the backfilling work is completed, the entire backfilling area shall be inspected to confirm whether the surface flatness, compaction and uniformity of the backfilling materials meet the design standards. If it is found that the backfill soil has local settlement or the compaction is not up to standard, additional backfilling or re-compaction shall be carried out in time to ensure that the overall quality of the backfilling area meets the expected standards.

[0102] The backfilling process of the present invention adopts layered backfilling and precise compaction control, so that the backfill soil around and above the drainage pipe can reach the design required density, thereby improving the bearing capacity and stability of the drainage pipe. By using fine-grained soil and pure fine sand within 50 cm of the top of the drainage pipe, the direct impact and wear on the drainage pipe can be effectively reduced, providing a good buffer layer.

[0103] The establishment of foundation settlement observation points enables timely monitoring of settlement during and after construction, foreseeing and preventing potential settlement problems, and ensuring the safety and reliability of project quality. This backfill method effectively reduces pipe damage caused by foundation settlement or loose backfill soil, and significantly improves the overall stability of the project.

[0104] Example 1: Application in urban road reconstruction projects

[0105] In urban road reconstruction projects, the dense layout of underground pipelines and the busy traffic conditions have put forward requirements for high efficiency, environmental protection and low disturbance in construction. In this case, the traditional cast-in-place pipe construction process often leads to problems such as long traffic interruption time, low construction efficiency, and great impact on the environment. To this end, this embodiment adopts the linear engineering assembled combined pipe construction method of the present invention, aiming to improve construction efficiency, shorten construction period, reduce the impact on traffic and the surrounding environment, and improve the connection stability and sealing performance of the pipeline.

[0106] Factory prefabricated assembled pipes: realize standardized production and reduce on-site construction steps.

[0107] Arc bolt connection and multiple waterproof technologies: Bolt connection and multiple layers of sealing materials are used to improve the connection strength and waterproof performance of the drainage pipes.

[0108] Layered backfill and settlement observation: Through the combination of fine-grained soil and settlement observation, the long-term stability of the foundation after construction is ensured.

[0109] This embodiment is applicable to the reconstruction projects of urban main roads and secondary roads, and the laying of underground power and communication pipelines.

[0110] In order to verify the advantages of the present invention, a comparative experiment was set up in a certain city main road reconstruction project to compare the performance differences between the construction method of the present invention and the traditional cast-in-place construction method.

[0111]

[0112] It can be seen from the comparative experiments that the present invention is superior to the traditional construction technology in terms of construction period, construction cost, interface leakage rate, noise and dust pollution, sedimentation control, project quality and impact on traffic, especially in the waterproof performance of the interface and the friendliness of the construction environment.

[0113] Example 2: Application in long-distance municipal pipeline projects in suburbs

[0114] Long-distance municipal pipeline projects in the suburbs usually face the problem of relatively loose construction sites but complex geological conditions. When dealing with long-distance construction, the traditional cast-in-place process is prone to quality problems such as poor interface sealing and pipeline foundation settlement, and the construction period is long. In response to these problems, this embodiment adopts the assembled combined pipe laying construction method of the present invention, aiming to improve the construction quality and efficiency of long-distance pipelines and ensure the stability of the pipe laying under complex geological conditions.

[0115] Long-distance and fast installation: Through factory prefabrication and on-site assembly, the installation time of long-distance pipelines can be significantly reduced.

[0116] Multi-layer sealing and waterproofing technology: Multiple sealing materials ensure the long-term waterproof performance of the drainage pipes under complex geological conditions.

[0117] Foundation settlement monitoring combined with backfill technology: Through the combination of real-time settlement monitoring and layered backfilling, foundation settlement problems in long-distance construction can be effectively prevented.

[0118] This embodiment is suitable for long-distance municipal pipeline construction in suburbs or urban-rural fringe areas, such as the laying of water supply pipelines, sewage discharge pipelines, power and communication pipelines.

[0119] In order to further verify the advantages of the present invention in long-distance construction, a comparative experiment was conducted on the following performance tests in a long-distance pipeline project in a suburban area.

[0120]

[0121]

[0122] It can be seen from the comparative experimental results that the present invention is significantly superior to traditional construction methods in terms of long-distance construction speed, interface leakage rate control, pipeline foundation settlement, long-term maintenance cost and project acceptance pass rate, especially in dealing with complex geological conditions and environmental influences, showing excellent adaptability and stability.

[0123] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A linear engineering assembled combined pipe construction method, characterized by: The following steps are involved: S1. Prefabrication of pipes: Standardized prefabrication of pipes is carried out in the factory, and the shape, specification and connection structure of pipes are set according to construction requirements to meet the technical requirements of installation and connection; S2. Excavation of the construction area: trench excavation shall be carried out in the construction area according to the design standards. The excavation depth and width shall comply with the installation dimensions of the drainage pipes. Slope support and drainage measures shall be implemented to ensure the stability of the excavation area. S3. Setting of cushion layer: Lay cushion layer materials that meet the design specifications at the bottom of the trench to ensure the stability and flatness of the installation of the drainage pipes; S4. Installation of drainage pipes: transport the prefabricated drainage pipes to the construction site and install them in the grooves in the predetermined order and elevation, ensuring that the positions of the drainage pipes are aligned and fixed; S5. Interface processing: seal and structurally reinforce the connection interfaces of adjacent pipes to ensure the waterproof performance of the interfaces and the stability of the connections; S6. Backfill: After the drainage pipes are installed and accepted, the trenches shall be backfilled in layers. The backfill materials and thickness shall meet the design requirements to restore the original state of the construction area.

2. A linear engineering assembled combined pipe construction method according to claim 1, characterized in that: In the prefabrication of the row pipes, the standard length of the row pipes is 6 meters, and four connecting holes with a diameter of 38 mm are set at both ends of each section of the row pipe at a distance of 180 mm from the end face, and spiral compression reinforcements with a pitch of 50 mm are evenly arranged around the connecting holes.

3. A linear engineering assembled combined pipe construction method according to claim 1, characterized in that: The depth of the trench excavation is 1.2 to 1.5 times the outer diameter of the drainage pipe, the slope angle is not more than 33 degrees, and a 0.5-meter-deep collection well is set every 10 meters at the bottom of the trench, and a 50mm-thick gravel layer is laid at the bottom of the collection well.

4. A linear engineering assembled combined pipe construction method according to claim 1, characterized in that: The cushion layer is set up with medium-coarse sand with a particle size between 0.5 and 4.75 mm. The cushion layer thickness is precisely controlled to be 100 mm, and the density after compaction is not less than 95% of the standard density. A drainage slope of 1% to 2% is set on the surface of the cushion layer, and drainage grooves with a width of 100 mm and a depth of 50 mm are set on both sides of the cushion layer.

5. A linear engineering assembled combined pipe arrangement construction method according to claim 1, characterized in that: The installation of the pipes is carried out section by section in a sequential order, and the installation position deviation of each section of the pipes does not exceed ±5mm; The QY25K crane is used to hoist the pipes, and the hoisting speed is controlled to no more than 3 meters per minute. During the installation process, a wire alignment tool is used to ensure that the alignment of the pipes is not less than 99%.

6. A linear engineering assembled combined pipe construction method according to claim 1, characterized in that: The alignment and positioning of the pipe installation includes setting reserved guide chain tightening holes on both sides of the pipe for tightening and positioning, and the diameter of each guide chain tightening hole is 25mm and the spacing is 2 meters; When installing the pipes, use a chain guide tool to tighten and fix the adjacent pipes, and after installation, use C30 shrinkage-compensating fine stone concrete to fill the interface area.

7. The linear engineering assembled combined pipe arrangement construction method according to claim 1 is characterized by: The interface is connected by arc bolts of M27 specification, and the bolt tightening torque at each interface is 80 to 100 Nm; Use 3 to 5mm thick two-component polysulfide sealant at the interface seal, and paste 40mm wide water-swellable rubber on the inside, with a swelling rate of at least 150%; A 10 mm thick nitrile cork rubber sheet is also provided on the outside of the interface.

8. The linear engineering assembled combined pipe arrangement construction method according to claim 1 is characterized by: During the backfilling process, the thickness of each layer of backfill soil is controlled between 200 and 300 mm, and a YZ25 roller is used for compaction, and the density after compaction reaches 93% or above; Use fine-grained soil with a particle size of less than 20 mm to backfill within 50 cm of the top of the drainage pipe, and use pure fine sand as the cover layer; During backfilling and compaction, several foundation settlement observation points are set up with a spacing of 20 to 30 meters between each observation point, and real-time monitoring is carried out using a settlement meter.

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