Rainwater and sewage pipeline trench laying support structure, laying structure and construction method thereof

Abstract

The present application relates to rain sewage pipeline trench laying support structure, laying structure and its construction method, rain sewage pipeline trench laying support structure includes two rows of steel sheet piles, waist beam and support steel pipe, two rows of steel sheet piles are respectively anchored into the preset depth below the foundation surface, the pipeline laying trench excavation interval is reserved between two rows of steel sheet piles, the inner side upper portion of each row of steel sheet piles is fixed with at least one row of waist beam, the waist beam is arranged along the length direction of the steel sheet pile, a plurality of support steel pipes are fixed between the waist beams of two rows of steel sheet piles, and a construction interval is reserved between two adjacent support steel pipes. The rain sewage pipeline trench laying support structure of the present application can realize the stable structure support of rain sewage pipeline trench construction by setting two rows of steel sheet piles, waist beam and support steel pipe.

Description

Technical Field

[0001] This invention relates to the technical field of stormwater and sewage construction in municipal engineering, specifically to a support structure, laying structure and construction method for laying stormwater and sewage pipelines in the same trench. Background Technology

[0002] In municipal engineering construction, traditional trenching methods require sequential excavation and construction of rainwater and sewage pipes, resulting in a "waiting period" and repetitive trench excavation and backfilling processes. This leads to substantial earthwork excavation, occupies significant space, and obstructs the access of other pipelines. The underground space layout is also compact, making future maintenance and repairs difficult. Summary of the Invention

[0003] In order to solve one or more technical problems existing in the prior art, the present invention provides a support structure for laying rainwater and sewage pipelines in the same trench, a laying structure and a construction method thereof.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: The present invention provides a support structure for laying rainwater and sewage pipelines in the same trench, including two rows of steel sheet piles, a waist beam and supporting steel pipes. The two rows of steel sheet piles are respectively anchored into the ground at a predetermined depth below the foundation surface. A pipeline laying trench excavation interval is reserved between the two rows of steel sheet piles. At least one row of waist beams is fixed on the upper inner side of each row of steel sheet piles. The waist beams extend along the length direction of the steel sheet pile. Multiple supporting steel pipes are fixed between the waist beams of the two rows of steel sheet piles. A construction interval is reserved between two adjacent supporting steel pipes.

[0005] The beneficial effects of the present invention are: the supporting structure for laying rainwater and sewage pipelines in the same trench of the present invention can achieve stable structural support for the construction of rainwater and sewage pipelines in the same trench by setting two rows of steel sheet piles, waist beams and supporting steel pipes.

[0006] Simultaneous excavation and construction of storm and sewage pipelines in the same trench allows for the merging of construction cycles for both pipelines through "one-time excavation and synchronous construction," significantly shortening the overall project duration. This technology enables simultaneous excavation and parallel operation of storm and sewage pipelines, significantly improving the utilization rate of the work surface. It not only avoids the problem of repeated excavation of earthwork associated with traditional secondary trenching, but also allows the storm water pipe foundation to be placed on undisturbed soil layers, reducing foundation treatment work and further lowering costs and reducing potential quality risks. From a quality perspective, simultaneous trench construction facilitates centralized quality inspection of both pipelines, and layered backfilling prevents uneven settlement of the pipelines. From a safety perspective, the use of a stable support technology combining steel sheet piles with lintel beams and supporting steel pipes significantly reduces the risks of trench collapse and hoisting operations.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, multiple steel plate brackets are fixed to the upper inner side of each row of sheet piles. The multiple steel plate brackets are arranged at intervals along the length of the sheet pile. At least one row of waist beams on each row of sheet piles is installed on the multiple steel plate brackets.

[0009] The beneficial effects of adopting the above-mentioned further scheme are: by setting steel plate brackets, it is convenient to connect the waist beam and the steel sheet pile, and to facilitate the disassembly of the waist beam and the supporting steel pipe.

[0010] Furthermore, the steel plate bracket is arranged perpendicular to the length direction of the steel sheet pile; the steel plate bracket has an inverted right-angled trapezoidal structure, the shorter base of the steel plate bracket is arranged downwards, the right-angled waist edge of the steel plate bracket is fixed to the steel sheet pile, and the waist beam is installed on the longer base edge of the steel plate bracket.

[0011] Furthermore, the waist beam is an I-beam, and the two parallel plates of the I-beam are arranged vertically and supported on the steel plate bracket.

[0012] Furthermore, each row of sheet piles includes multiple vertically arranged U-shaped steel plates. The two open edges of the U-shaped steel plates are bent outward to form rolled edge grooves. Adjacent U-shaped steel plates are arranged in a mirror-like staggered manner and connected by the rolled edge grooves. Multiple U-shaped steel plates are connected sequentially along the length of the sheet pile to form a wave-shaped structure. The cross-section of the U-shaped steel plate is an flared U-shaped structure, and the bottom of the flared U-shaped structure is a straight structure.

[0013] The beneficial effects of adopting the above-mentioned further scheme are: the steel sheet pile adopts a U-shaped steel plate butt joint interlocking structure, which is convenient for disassembly and assembly and provides better support stability.

[0014] Furthermore, each end of the supporting steel pipe is fixed with an overlapping block, and the two ends of the supporting steel pipe are respectively overlapped on the two rows of waist beams through the overlapping blocks. The end faces of the two ends of the supporting steel pipe abut against and are fixed on the corresponding waist beams.

[0015] The beneficial effect of adopting the above-mentioned further solution is that by fixing overlapping blocks at both ends of the supporting steel pipe, the risk of the supporting steel pipe falling off during installation is avoided.

[0016] Furthermore, a load-reducing platform is provided on the outer side of the top of each of the two rows of sheet piles, and a buffer slope is provided on the outer side of each load-reducing platform. The outer side of each buffer slope is the foundation surface, and a row of safety railings is provided on the foundation surface on the outer side of each buffer slope. The safety railings extend along the length of the sheet piles, and a row of brick-built water-retaining platforms is provided on the outer side of the lower part of the safety railings.

[0017] The beneficial effects of adopting the above-mentioned further solutions are: by setting up load-reducing platforms, buffer slopes, and safety railings, soil backflow can be avoided during construction, thus ensuring construction safety.

[0018] The present invention also provides a structure for laying rainwater and sewage pipelines in the same trench, including the support structure for laying rainwater and sewage pipelines in the same trench as described above. A pipeline laying trench is excavated between the two rows of steel sheet piles. A rainwater pipeline laying platform and a sewage pipeline laying platform are formed in the pipeline laying trench. The rainwater pipeline laying platform and the sewage pipeline laying platform are both arranged to extend along the length direction of the steel sheet piles. The height of the rainwater pipeline laying platform is lower than the height of the sewage pipeline laying platform. The rainwater pipeline laying platform and the sewage pipeline laying platform are connected by a slope transition.

[0019] The beneficial effects of this invention are as follows: The co-laying structure for rainwater and sewage pipelines, achieved by setting up two rows of steel sheet piles, a wainscoting beam, and supporting steel pipes, provides stable structural support for the co-laying of rainwater and sewage pipelines. Constructing rainwater and sewage pipelines in the same trench reduces the use of construction machinery and other resources. Compared to separate trench construction, it reduces the amount of excavation and backfilling earthwork, as well as the amount of foundation pit support materials used, thereby shortening the construction period, reducing construction costs, and reserving sufficient operating space for other pipelines.

[0020] This invention also provides a construction method for a structure in which rainwater and sewage pipelines are laid in the same trench, comprising the following steps: S1. According to the design drawings, accurately mark the axial position of each U-shaped steel plate in each row of steel sheet piles as the pile position, and mark the pile position of each U-shaped steel plate. S2, a long spiral drilling rig is used for pilot hole drilling. After the pilot hole drilling is completed, the drill rod is pulled out and the formed borehole opening is protected. S3, using the single-pile driving method or the screen-type driving method to drive each U-shaped steel plate into the corresponding pile position, and driving two U-shaped steel plates into one borehole. S4. After the two rows of sheet piles are driven, the foundation pit is excavated between the two rows of sheet piles. After the foundation pit is excavated to a preset distance below the support elevation, the waist beams are installed on the inner side walls of the two rows of sheet piles respectively. The gap between the waist beams and the sheet piles is filled with steel plates or concrete blocks. After the waist beams are installed, the support steel pipes are placed between the two rows of waist beams and the two ends of the support steel pipes are fixed to the two rows of waist beams respectively. S5, continue excavating the foundation pit to the elevation of the sewage pipeline laying platform, and then excavate in staggered steps to the elevation of the rainwater pipeline laying platform, with a slope transition between the rainwater pipeline laying platform and the sewage pipeline laying platform; S6, Install rainwater pipelines on the rainwater pipeline laying platform and install sewage pipelines on the sewage pipeline laying platform; S7. Backfill coarse sand into the foundation pit to the preset height above the sewage pipeline, then backfill the original soil to the top of the steel sheet pile, backfilling and compacting in layers; during the backfilling of the original soil, remove the waist beam and supporting steel pipe; after backfilling the original soil, pull out each U-shaped steel sheet of the steel sheet pile one by one at intervals, and backfill and compact the pile hole produced after the pile is pulled out with medium-coarse sand.

[0021] The beneficial effects of the present invention are: the construction method of laying rainwater and sewage pipelines in the same trench can ensure the safe and stable construction of each supporting structure and provide an effective supporting structure for subsequent pipeline laying.

[0022] Furthermore, in S3, the screen-type driving method is used to drive each U-shaped steel plate into the corresponding pile position. This includes first installing guide frames at the pile positions of the two rows of steel sheet piles, then inserting multiple U-shaped steel plates into the guide frames and aligning them with the corresponding pile positions, first driving the two U-shaped steel plates located at both ends of the guide frames to the support elevation as positioning piles, and then driving the other U-shaped steel plates to the support elevation in sequence. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the rainwater and sewage pipeline laying in the same trench according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the rainwater and sewage pipeline laying in the same trench according to the present invention. Figure 2 ; Figure 3 This is a top view schematic diagram of the supporting structure for laying rainwater and sewage pipelines in the same trench according to the present invention. Figure 4 for Figure 3 Enlarged structural diagram of section A in the middle; Figure 5 for Figure 4 A magnified structural diagram of section B.

[0024] The attached diagram lists the components represented by each number as follows: 1. Steel sheet piles; 11. U-shaped steel plates; 12. Edge-rolled grooves; 2. Waist beam; 3. Supporting steel pipe; 31. Overlapping block; 4. Steel plate bracket; 5. Load-reducing platform; 51. Foundation surface; 52. Safety railing; 53. Brick-built water-retaining platform; 54. Rainwater pipeline laying platform; 55. Sewage pipeline laying platform; 56. Buffer slope; 57. Slope surface; 6. Rainwater pipelines; 61. Sewage pipelines. Detailed Implementation

[0025] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0026] Example 1 like Figures 1-5 As shown, this embodiment of a support structure for laying rainwater and sewage pipelines in the same trench includes two rows of steel sheet piles 1, a waist beam 2, and supporting steel pipes 3. The two rows of steel sheet piles 1 are respectively anchored into the foundation surface 51 below a predetermined depth. A pipeline laying trench excavation interval is reserved between the two rows of steel sheet piles 1. At least one row of waist beams 2 is fixed on the upper inner side of each row of steel sheet piles 1. The waist beams 2 extend along the length direction of the steel sheet pile 1. Multiple supporting steel pipes 3 are fixed between the waist beams 2 of the two rows of steel sheet piles 1. A construction interval is reserved between two adjacent supporting steel pipes 3, and the construction interval is no more than 4m.

[0027] Optionally, the height of the sheet pile 1 is 9~12m. Sheet piles of different heights can be used depending on the trench depth.

[0028] In this embodiment, the support structure uses vertical support piles for support. Larssen steel sheet piles can be used, driven with interlocking. A bracing system is set below the top of the piles, with the support provided by the waist beam and supporting steel plates.

[0029] The supporting structure for laying rainwater and sewage pipelines in the same trench in this embodiment can achieve stable structural support for the construction of rainwater and sewage pipelines in the same trench by setting two rows of steel sheet piles, waist beams and supporting steel pipes.

[0030] Simultaneous excavation and construction of storm and sewage pipelines in the same trench allows for the merging of construction cycles for both pipelines through "one-time excavation and synchronous construction," significantly shortening the overall project duration. This technology enables simultaneous excavation and parallel operation of storm and sewage pipelines, significantly improving the utilization rate of the work surface. It not only avoids the problem of repeated excavation of earthwork associated with traditional secondary trenching, but also allows the storm water pipe foundation to be placed on undisturbed soil layers, reducing foundation treatment work and further lowering costs and reducing potential quality risks. From a quality perspective, simultaneous trench construction facilitates centralized quality inspection of both pipelines, and layered backfilling prevents uneven settlement of the pipelines. From a safety perspective, the use of a stable support technology combining steel sheet piles with lintel beams and supporting steel pipes significantly reduces the risks of trench collapse and hoisting operations.

[0031] Municipal engineering projects utilize integrated stormwater and sewage trench construction, reducing earthwork excavation and backfilling. Integrated trench construction requires only one trench excavation, which is expected to reduce earthwork excavation and backfilling by 15% to 30% compared to separate trench construction, lowering earthwork transportation and disposal costs. It also saves on material consumption, reducing the use of trench support materials (such as sheet piles and channel steel) and the consumption of pipeline foundation concrete and backfill soil. Furthermore, it reduces labor and equipment costs; the simplified construction process reduces labor input by 20% to 30%, shortens equipment usage time, lowers rental costs, and reduces management costs. Compared to separate trench construction, integrated trench construction is expected to reduce unit length costs by 18% to 25%, demonstrating significant economic advantages.

[0032] Example 2 Based on Example 1, this example provides a preferred installation scheme for the waist beam 2, such as... Figures 1-4 As shown, multiple steel plate brackets 4 are fixed to the upper inner side of each row of sheet piles 1. The multiple steel plate brackets 4 are arranged at intervals along the length direction of the sheet pile 1. At least one row of waist beams 2 on each row of sheet piles 1 is installed on the multiple steel plate brackets 4. By setting up steel plate brackets, the connection between the waist beams and the sheet piles is facilitated, and the disassembly of the waist beams and supporting steel pipes is also facilitated.

[0033] Specifically, the wainscoting 2 can be directly installed on the steel plate brackets 4 of the same row of steel sheet piles 1, and then supported by supporting steel pipes. The wainscoting 2 and the steel sheet piles 1, and the wainscoting 2 and the steel plate brackets 4 can be fixed with bolts, steel wires, or by welding.

[0034] A preferred embodiment of this solution is as follows: Figure 1 and Figure 2 As shown, the steel plate bracket 4 has an inverted right-angled trapezoidal structure, with the shorter base of the steel plate bracket 4 facing downwards, the right-angled waist side of the steel plate bracket 4 fixed to the steel sheet pile 1, and the waist beam 2 installed on the longer base side of the steel plate bracket 4.

[0035] Specifically, such as Figure 1 and Figure 2 As shown, the steel plate bracket 4 is arranged perpendicular to the length direction of the steel sheet pile 1.

[0036] like Figure 1 and Figure 2 As shown, in a preferred embodiment, the waist beam 2 is an I-beam, and the two parallel plates of the I-beam are arranged vertically and supported on the steel plate bracket 4.

[0037] Furthermore, the wainscoting 2 can be made of two I-beams to form a double-jointed I-beam wainscoting.

[0038] Example 3 Based on Embodiment 1 or Embodiment 2, this embodiment provides a preferred structure for the steel sheet pile 1, such as... Figures 3-4 As shown, each row of sheet piles 1 includes multiple vertically arranged U-shaped steel plates 11. The two open edges of each U-shaped steel plate 11 are bent outwards to form rolled edges 12. Adjacent U-shaped steel plates 11 are arranged in a mirror-like, staggered manner and connected by the rolled edges 12. Multiple U-shaped steel plates 11 are sequentially connected along the length of the sheet pile 1 to form a wavy structure. The sheet piles adopt a U-shaped steel plate butt-joint structure, which facilitates assembly and disassembly and provides better support stability.

[0039] like Figures 3-5As shown, the cross-section of the U-shaped steel plate 11 is a flared U-shaped structure, and the bottom of the flared U-shaped structure is a straight structure.

[0040] In this embodiment, during construction of each row of sheet piles 1, a U-shaped steel plate 11 is first driven in, and then the rolled edge groove 12 of the next U-shaped steel plate 11 is inserted and fastened to the rolled edge groove of the driven U-shaped steel plate 11, and then the next U-shaped steel plate 11 is driven into the foundation.

[0041] Example 4 like Figures 1-4 As shown, in this embodiment, the two ends of the supporting steel pipe 3 are respectively fixed with overlapping blocks 31. The two ends of the supporting steel pipe 3 are respectively overlapped on the two rows of waist beams 2 through the overlapping blocks 31. The end faces of the two ends of the supporting steel pipe 3 abut against and are fixed on the corresponding waist beams 2. The fixing can be done by welding.

[0042] Example 5 Based on any of the above embodiments, this embodiment provides a preferred external structure for the sheet pile 1, such as... Figure 1 and Figure 2 As shown, a load-reducing platform 5 is provided on the outer side of the top of each of the two rows of sheet piles 1. A buffer slope 56 is provided on the outer side of each load-reducing platform 5, and the outer side of each buffer slope 56 is the foundation surface 51. A row of safety railings 52 is provided on the foundation surface 51 outside each buffer slope 56. The safety railings 52 extend along the length of the sheet pile 1, and a row of brick-built water-retaining platforms 53 is provided on the outer side of the lower part of each safety railing 52. The height of the load-reducing platform from the foundation surface 51 can be 1.8~2.2m, and the width of the load-reducing platform can be 0.5~1m. By setting up load-reducing platforms, buffer slopes, and safety railings, soil backflow during construction is avoided, ensuring construction safety.

[0043] Example 6 This embodiment provides a structure for laying rainwater and sewage pipelines in the same trench, including the supporting structure for laying rainwater and sewage pipelines in the same trench as described in any of the above embodiments. A pipeline laying trench is excavated between two rows of steel sheet piles 1. A rainwater pipeline laying platform 54 and a sewage pipeline laying platform 55 are formed in the pipeline laying trench. Both the rainwater pipeline laying platform 54 and the sewage pipeline laying platform 55 extend along the length direction of the steel sheet piles 1. The height of the rainwater pipeline laying platform 54 is lower than the height of the sewage pipeline laying platform 55. The rainwater pipeline laying platform 54 and the sewage pipeline laying platform 55 are connected by a slope 57. The slope coefficient of the rainwater pipeline laying platform 54 and the sewage pipeline laying platform 55 can be 1:0.3. Rainwater pipelines 6 are laid on the rainwater pipeline laying platform 54, and sewage pipelines 61 are laid on the sewage pipeline laying platform 55.

[0044] In this embodiment, the diameter of the rainwater pipeline 6 is larger than that of the sewage pipeline 61. For example, the diameter of the rainwater pipeline 6 can be 1200mm, and the diameter of the sewage pipeline 61 can be 400mm. The rainwater pipeline 6 is located 2~2.5m below the sewage pipeline 61. The width of the pipeline laying trench is 4000~4500mm.

[0045] In this embodiment, steel sheet piles of different heights can be used for support according to different pipeline laying trench depths. For example, when the trench depth of the pipeline laying trench is 4.5 m ≤ 5 m, 9 m Larssen piles are used for support; when the trench depth of the pipeline laying trench is 5 m ≤ 7.5 m, 12 m Larssen piles are used for support.

[0046] The co-laying structure for storm and sewage pipelines in this embodiment achieves stable structural support for co-laying by setting up two rows of steel sheet piles, a joist beam, and supporting steel pipes. Constructing storm and sewage pipelines in the same trench reduces the use of construction machinery and other resources. Compared to separate trench construction, it reduces the amount of excavation and backfilling earthwork, as well as the amount of foundation pit support materials used, thereby shortening the construction period, reducing construction costs, and reserving sufficient operating space for other pipelines.

[0047] This embodiment uses the same trench for both rainwater and sewage pipelines, which reduces the use of construction machinery and other resources. Compared to separate trench construction, it reduces the amount of excavation and backfilling earthwork, as well as the amount of foundation pit support materials used, thereby shortening the construction period, reducing construction costs, and reserving sufficient operating space for other pipelines. Calculations show that traditional separate trench construction takes about 120 days, while the same trench construction method is expected to take only 70 days, saving 42% of the construction period, reducing construction costs, and reserving sufficient operating space for other pipelines.

[0048] Example 7 This embodiment provides a construction method for the co-laying structure of rainwater and sewage pipelines as described in Embodiment 6, including the following steps: S1. According to the design drawings, accurately mark the axial position of each U-shaped steel plate 11 in each row of steel sheet piles 1 as the pile position, and mark the pile position of each U-shaped steel plate 11 with lime or steel bars; for example, use lime to sprinkle two lines as pile position marks for two rows of steel sheet piles.

[0049] In fact, before laying out and positioning the sheet piles, it is necessary to excavate to a certain depth from the foundation surface 51 to form a load-reducing platform 5, and then install safety guardrails 52 on the foundation surface 51 on both sides of the load-reducing platform 5. A row of brick-built water-retaining platforms 53 is then set on the lower outer side of the safety guardrails 52.

[0050] S2 uses a long spiral drilling rig for pilot hole drilling. After the pilot hole drilling is completed, the drill rod is pulled out and the drill hole opening is protected. The long spiral drilling rig is 9m~12m long and 30cm in diameter. The pilot hole drilling can also be carried out by positioning and laying out lines. The pilot hole position is accurately laid out according to the pile position to ensure that the hole coincides with the pile position of the steel sheet pile. One pilot hole can statically press two U-shaped steel sheets. During drilling, control the verticality of the borehole (deviation ≤1%), and the drilling depth should be slightly greater than the designed penetration depth of the sheet pile. Move the long auger drilling rig to the pile location and adjust its levelness so that the center of the drill rod is aligned with the pile location mark, with an error controlled within 10mm. The diameter of the pilot hole should be slightly smaller than the width of the sheet pile to ensure sufficient friction after backfilling. Start the drilling rig and use a uniform drilling method (drilling speed controlled between 0.8 and 1.2 m / min). Adjust the drilling pressure according to the strata conditions to avoid drill rod swaying. Monitor the verticality of the drill rod in real time during drilling and adjust it using the verticality monitor on the drilling rig to ensure that the verticality deviation is no greater than 1 / 200. Based on the designed pilot hole depth, control the drilling depth through the depth mark on the drill rod or an electronic metering device. After reaching the designed depth, stop drilling, allow the borehole to idle for 10-15 seconds, and clean the residue at the bottom of the hole. Slowly raise the drill rod, controlling the lifting speed at 0.5~0.8m / min to avoid the hole wall from collapsing due to excessively fast lifting. After the drill rod is raised, protect the hole opening in time (such as by covering it with a steel plate) to prevent debris from falling in, and then move the drilling rig to the next pile position.

[0051] S3. Using either the single-pile driving method or the screen-type driving method, each U-shaped steel plate 11 is driven into its corresponding pile position, with two U-shaped steel plates 11 driven into one borehole. A crane is used to lift the vibratory hammer and the individual U-shaped steel plates 11, aligning the pile tip of the U-shaped steel plate 11 with the pile position. A theodolite or plumb line is used to correct the verticality of the U-shaped steel plate 11 from two directions, and the verticality deviation should be controlled within 0.5%. After correction, the vibratory hammer is used to drive the U-shaped steel plate 11 to the design elevation. Verticality should be continuously monitored during the pile driving process, and any deviations should be corrected promptly.

[0052] S4. After the two rows of sheet piles 1 are driven, the foundation pit is excavated between the two rows of sheet piles 1. After the foundation pit is excavated to a preset distance (e.g., 0.5m) below the support elevation (i.e., the height of the load reduction platform mentioned in the previous embodiment), the waist beams 2 are installed on the inner side walls of the two rows of sheet piles 1 respectively. The gap between the waist beams 2 and the sheet piles 1 is filled with steel plates or concrete blocks. After the waist beams 2 are installed, the support steel pipes 3 are placed between the two rows of waist beams 2. The two ends of the support steel pipes 3 are fixed to the two rows of waist beams 2 respectively. The steel plate brackets 4 are welded on the inner side of the sheet piles 1. The waist beams 2 are installed on the upper part of the steel plate brackets 4. The contact parts of the waist beams 2, steel plate brackets 4, and sheet piles 1 are fully welded and fixed. The steel plate brackets 4 and the waist beams 2, and the waist beams 2 and the sheet piles 1 should be firmly connected to form a stable support system. The support installation should follow the principle of "support first, then excavate".

[0053] S5, continue excavating the foundation pit to the sewage pipeline laying platform 55 elevation, and then excavate in staggered steps to the rainwater pipeline laying platform 54 elevation, with a slope transition between the rainwater pipeline laying platform 54 and the sewage pipeline laying platform 55. S6, first install rainwater pipeline 6 on rainwater pipeline laying platform 54, then install sewage pipeline 61 on sewage pipeline laying platform 55; S7. Backfill coarse sand into the foundation pit to the preset height above the sewage pipeline 61, and then backfill the original soil to the top of the steel sheet pile 1. Backfill in layers and compact in layers. During the backfilling of the original soil, remove the waist beam 2 and the supporting steel pipe 3. After backfilling the original soil, pull out each U-shaped steel plate 11 of the steel sheet pile 1 one by one at intervals. The pile hole generated after the pile is pulled out is backfilled and compacted with medium and coarse sand.

[0054] The demolition strictly follows the principles of top-down, layered symmetry, prioritizing auxiliary structures before the main structure, and gradual unloading layer by layer. Before work begins, the settlement and displacement data of the foundation pit slope are tested. Workers receive specific instructions on dismantling welded components, a work warning zone is established, and supervisors and specialized equipment such as gas cutting (plasma arc cutting machines) and hoisting equipment are provided. Before dismantling the steel supports (steel plate brackets, lintels, etc.), the foundation trench is backfilled to the bottom of the steel supports. Gas cutting (plasma arc cutting machines) is used to cut the welded joints between the supports and lintels, and between the lintels and sheet piles. Violent hammering or tearing of components is prohibited. After all supports and lintels are dismantled and backfilled, a vibratory pile extractor is used to remove the sheet piles. Pile extraction starts from the corners of the foundation pit where stress is lower, removing piles one at a time at intervals. The pile holes created during extraction are promptly backfilled and compacted with medium-coarse sand to prevent ground subsidence. The deformation of the foundation pit is monitored in real time throughout the entire process. If the value exceeds the standard, work is immediately stopped and reinforcement is carried out. Open-air cutting and demolition operations are prohibited in winds of level 6 or above and in rainy weather. All demolished components are hoisted to a designated area and stacked neatly.

[0055] Furthermore, in S3, a screen-type driving method is used to drive each U-shaped steel plate 11 into its corresponding pile position. This includes first installing guide frames at the pile positions of the two rows of sheet piles 1, then inserting multiple U-shaped steel plates 11 into the guide frames and aligning them with their corresponding pile positions. The two U-shaped steel plates 11 located at both ends of the guide frames are driven to the support elevation first, serving as positioning piles. Then, the other U-shaped steel plates 11 are driven to the support elevation in sequence. The support elevation is the height of the load-reducing platform. This method effectively ensures the flatness and closure of the sheet pile wall.

[0056] The construction method of laying rainwater and sewage pipelines in the same trench in this embodiment can ensure the safe and stable construction of each supporting structure and provide an effective supporting structure for subsequent pipeline laying.

[0057] In the description of this invention, it should be understood that the terms "length", "upper", "lower", "vertical", "top", "bottom", "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.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A support structure for laying rainwater and sewage pipelines in the same trench, characterized in that, It includes two rows of sheet piles, a wainscoting, and supporting steel pipes. The two rows of sheet piles are anchored to a predetermined depth below the foundation surface. A pipeline laying trench excavation interval is reserved between the two rows of sheet piles. At least one row of wainscoting is fixed on the upper inner side of each row of sheet piles. The wainscoting extends along the length of the sheet pile. Multiple supporting steel pipes are fixed between the wainscoting of the two rows of sheet piles. A construction interval is reserved between two adjacent supporting steel pipes.

2. The supporting structure for laying rainwater and sewage pipelines in the same trench as described in claim 1, characterized in that, Multiple steel plate brackets are fixed to the upper inner side of each row of sheet piles. The multiple steel plate brackets are arranged at intervals along the length of the sheet pile. At least one row of waist beams on each row of sheet piles is installed on the multiple steel plate brackets.

3. The supporting structure for laying rainwater and sewage pipelines in the same trench according to claim 2, characterized in that, The steel plate bracket is arranged perpendicular to the length direction of the steel sheet pile; the steel plate bracket has an inverted right-angled trapezoidal structure, the shorter base of the steel plate bracket is arranged downwards, the right-angled waist side of the steel plate bracket is fixed to the steel sheet pile, and the waist beam is installed on the longer base side of the steel plate bracket.

4. The supporting structure for laying rainwater and sewage pipelines in the same trench according to claim 2, characterized in that, The waist beam is an I-beam, and the two parallel plates of the I-beam are arranged vertically and supported on the steel plate bracket.

5. The supporting structure for laying rainwater and sewage pipelines in the same trench according to claim 1, characterized in that, Each row of sheet piles includes multiple vertically arranged U-shaped steel plates. The two open edges of each U-shaped steel plate are bent outward to form rolled edges. Adjacent U-shaped steel plates are arranged in a mirror-like staggered manner and connected by the rolled edges. Multiple U-shaped steel plates are connected sequentially along the length of the sheet pile to form a wave-shaped structure. The cross-section of each U-shaped steel plate is an flared U-shaped structure, and the bottom of the flared U-shaped structure is a straight structure.

6. The supporting structure for laying rainwater and sewage pipelines in the same trench according to claim 1, characterized in that, The two ends of the supporting steel pipe are respectively fixed with overlapping blocks, and the two ends of the supporting steel pipe are respectively overlapped on the two rows of waist beams through the overlapping blocks. The end faces of the two ends of the supporting steel pipe abut against and are fixed on the corresponding waist beams.

7. The supporting structure for laying rainwater and sewage pipelines in the same trench according to claim 1, characterized in that, The top outer side of both rows of sheet piles is provided with a load reduction platform, the outer side of each load reduction platform is provided with a buffer slope, the outer side of each buffer slope is the foundation surface, and a row of safety guardrails is provided on the foundation surface outside each buffer slope. The safety guardrails extend along the length of the sheet piles, and a row of brick-built water-retaining platforms is provided on the lower outer side of the safety guardrails.

8. A structure for laying rainwater and sewage pipelines in the same trench, characterized in that, The structure includes a support structure for laying rainwater and sewage pipelines in the same trench as described in any one of claims 1 to 7, wherein a pipeline laying trench is excavated between the two rows of steel sheet piles, and a rainwater pipeline laying platform and a sewage pipeline laying platform are formed in the pipeline laying trench. The rainwater pipeline laying platform and the sewage pipeline laying platform are both arranged to extend along the length direction of the steel sheet piles. The height of the rainwater pipeline laying platform is lower than the height of the sewage pipeline laying platform, and the rainwater pipeline laying platform and the sewage pipeline laying platform are connected by a slope transition.

9. The construction method of the rainwater and sewage pipeline co-laying structure as described in claim 8, characterized in that, Includes the following steps: S1. According to the design drawings, accurately mark the axial position of each U-shaped steel plate in each row of steel sheet piles as the pile position, and mark the pile position of each U-shaped steel plate. S2, a long spiral drilling rig is used for pilot hole drilling. After the pilot hole drilling is completed, the drill rod is pulled out and the formed borehole opening is protected. S3, using the single-pile driving method or the screen-type driving method to drive each U-shaped steel plate into the corresponding pile position, and driving two U-shaped steel plates into one borehole. S4. After the two rows of sheet piles are driven, the foundation pit is excavated between the two rows of sheet piles. After the foundation pit is excavated to a preset distance below the support elevation, the waist beams are installed on the inner side walls of the two rows of sheet piles respectively. The gap between the waist beams and the sheet piles is filled with steel plates or concrete blocks. After the waist beams are installed, the support steel pipes are placed between the two rows of waist beams and the two ends of the support steel pipes are fixed to the two rows of waist beams respectively. S5, continue excavating the foundation pit to the elevation of the sewage pipeline laying platform, and then excavate in staggered steps to the elevation of the rainwater pipeline laying platform, with a slope transition between the rainwater pipeline laying platform and the sewage pipeline laying platform; S6, Install rainwater pipelines on the rainwater pipeline laying platform and install sewage pipelines on the sewage pipeline laying platform; S7. Backfill coarse sand into the foundation pit to the preset height above the sewage pipeline, then backfill the original soil to the top of the steel sheet pile, backfilling and compacting in layers; during the backfilling of the original soil, remove the waist beam and supporting steel pipe; after backfilling the original soil, pull out each U-shaped steel sheet of the steel sheet pile one by one at intervals, and backfill and compact the pile hole produced after the pile is pulled out with medium-coarse sand.

10. The construction method of the rainwater and sewage pipeline co-laying structure according to claim 9, characterized in that, In S3, the screen-type driving method is used to drive each U-shaped steel plate into the corresponding pile position. This includes first installing guide frames at the pile positions of the two rows of steel sheet piles, then inserting multiple U-shaped steel plates into the guide frames and aligning them with the corresponding pile positions, first driving the two U-shaped steel plates located at both ends of the guide frames to the support elevation as positioning piles, and then driving the other U-shaped steel plates to the support elevation in sequence.

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