A construction method and structure for diversion and reconstruction of underground rainwater and sewage pipes

Abstract

The present invention belongs to the field of municipal engineering technology, and specifically discloses a construction method and diversion modification structure for underground rainwater and sewage pipe diversion. It includes: temporary drainage using a temporary diversion pipe; blocking the existing pipe III, supporting the trench foundation pit and excavating the foundation pit, dewatering the foundation pit, constructing a new pipe concrete foundation on the designed base of the foundation pit, and laying a new rainwater and sewage pipe on the new pipe concrete foundation; cutting the existing rainwater and sewage inspection well III, reinforcing the foundation of the new rainwater and sewage inspection well V, casting the new rainwater and sewage inspection well V, and waterproofing the interface between the existing pipe III and the new rainwater and sewage inspection well V; backfilling and compacting the foundation pit in layers to the designed top surface, removing the foundation pit support structure, removing the blocking device, and removing the temporary diversion pipe. The present invention ensures the drainage circulation of the existing rainwater and sewage pipes during the construction of the new rainwater and sewage pipes, and realizes the normal operation of the rainwater and sewage pipeline system.

Description

Technical Field

[0001] The present invention belongs to the technical field of municipal engineering, and more specifically, relates to a construction method for diversion and reconstruction of underground rainwater and sewage pipes and a diversion and reconstruction structure. Background Art

[0002] To improve urban flood control and drainage capabilities, increase sewage collection rates, and optimize the urban ecological environment, the reconstruction and expansion of stormwater and sewage projects are becoming increasingly common. During the replanning of stormwater and sewage networks, the removal of old pipe wells and existing pipelines, and the construction of new stormwater and sewage networks, existing stormwater and sewage systems are temporarily partially paralyzed, creating safety hazards during flood season, increasing pressure on upstream drainage systems, and prolonging construction time. Leakage is also prone to occur at the junctions between the old and new pipe networks, causing water and soil pollution, impacting the ecological environment and the normal lives of residents.

[0003] Chinese patent CN111088840A discloses a construction method for rainwater and sewage diversion applied to buildings. In fact, during the construction of sewage pipes, the construction of household sewage pipes can be carried out. The household sewage pipes are laid, and the water inlets of the household sewage pipes are connected to the sewage outlet of the building; the water outlets of the household sewage pipes are crossed through the inspection well and connected to the culvert for temporary diversion. This method uses the culvert for temporary diversion during the construction of the sewage pipe, and the diversion conditions are harsh. It is difficult to avoid the adverse effects of long-term paralysis of rainwater pipes, delays in construction period, and increased construction safety hazards caused by blocking. Chinese patent CN113445609A discloses a construction method for prefabricated well chambers for municipal rainwater and sewage and well chamber pipe opening blocking. The prefabricated well chamber is hoisted to a designated location, and a concrete pad is prefabricated at the bottom of the inner wall of the pipe opening; the pipe opening is treated; multiple layers of expansion waterstop are wrapped around the outer wall of the end of the sewage pipe, steel bars are tied in the pouring area, and concrete is poured. Ensure an effective rigid connection between the rainwater and sewage pipes and the inspection wells, and ensure that the rainwater and sewage well chambers do not leak. However, this method is only suitable for blocking between the well chamber and the pipe, and does not consider measures when the inner wall of the well chamber leaks. Chinese patent CN110306644A discloses a construction method for municipal rainwater and sewage diversion pipelines, including pipeline trench excavation, trench foundation pit support, construction of a drainage system in the trench, pouring of pipeline concrete bases, installation of rainwater and sewage diversion pipelines, construction of rainwater and sewage pipe intersection nodes, trench backfilling and compaction, and pulling out of steel sheet piles. However, the cost of designing a special template for this method is high and the turnover is poor.

[0004] Based on the above defects and deficiencies, this field urgently needs to make further improved designs for the diversion and transformation of existing underground rainwater and sewage pipes, and construct the drainage circulation of the existing rainwater and sewage pipes during the construction of rainwater and sewage pipes, to ensure the normal operation of the rainwater and sewage pipeline system, especially to resist the drainage pressure during the construction process during the flood season, and effectively avoid the adverse effects such as long-term paralysis of rainwater pipes, delays in construction period, and increased construction safety hazards caused by blockage. Summary of the Invention

[0005] In response to the above-mentioned deficiencies or improvement needs of the existing technology, the present invention provides a construction method and structure for diverting and reconstructing underground rainwater and sewage pipes. Combining the characteristics of underground rainwater and sewage pipes and their diversion and reconstructing features, a corresponding construction method and structure for diverting and reconstructing underground rainwater and sewage pipes are designed. This method and structure ensures the drainage circulation of existing rainwater and sewage pipes during the construction of new rainwater and sewage pipes, enabling the normal operation of the rainwater and sewage pipeline system, especially resisting the drainage pressure during construction during flood season. Through a series of process measures, the integrity of the foundation of the newly built rainwater and sewage inspection well is improved, and the adhesion and waterproof performance between the pipe and the well chamber are enhanced.

[0006] To achieve the above-mentioned object, according to one aspect of the present invention, a construction method for diverting and reconstructing an underground rainwater and sewage pipe is proposed. For an existing pipe III that needs to be reconstructed, an existing rainwater and sewage inspection well III and an existing rainwater and sewage inspection well I are sequentially connected upstream, and an existing rainwater and sewage inspection well II and an existing rainwater and sewage inspection well IV are sequentially connected downstream. The construction method comprises the following steps:

[0007] Step 1: Use a temporary diversion pipe to discharge the water in the existing rainwater and sewage inspection well I to the existing rainwater and sewage inspection well IV downstream;

[0008] Step 2: Block and drain the downstream pipeline of the existing rainwater and sewage inspection well I and the upstream pipeline of the existing rainwater and sewage inspection well IV, so that the existing pipeline III is closed and water-free;

[0009] Step 3: Carry out trench foundation pit support and excavation within the design scope, dewater the foundation pit, construct a new pipeline concrete foundation at the designed base of the foundation pit, and lay a new rainwater and sewage pipeline on the new pipeline concrete foundation;

[0010] Step 4: Cut the existing pipeline III, and the cutting width is set according to the newly built rainwater and sewage inspection well V;

[0011] Step 5: Strengthen the foundation of the newly built rainwater and sewage inspection well V and maintain it to the designed strength;

[0012] Step 6: Concrete a new rainwater and sewage inspection well V, and perform waterproofing on the interface between the existing pipeline III and the new rainwater and sewage inspection well V;

[0013] Step seven: Backfill and compact the foundation pit in layers to the designed top surface, remove the foundation pit support structure, remove the sealing device, and remove the temporary diversion pipe to restore the discharge of rainwater and sewage to its original state.

[0014] As a further preferred embodiment, in step 3, performing trench foundation pit support and foundation pit excavation within the design range specifically includes:

[0015] The support piles for the trench foundation pit support are set within 5m to 10m downwards from the existing rainwater and sewage inspection well Ⅰ to the shaped rainwater and sewage inspection well Ⅳ. The inner corners where the retaining structures of the trench foundation pit support meet should be reinforced with three-axis mixing piles or high-pressure deep grouting according to the soil and groundwater conditions to prevent groundwater from flowing into the foundation pit through the junction gaps. Steel purlins are arranged around the retaining structure, and horizontal supports for the foundation pit are installed at 4m intervals along the longitudinal direction of the existing pipeline foundation pit, and precipitation wells are arranged in the foundation pit.

[0016] As a further preferred embodiment, in step three, after the trench foundation pit support is completed, the foundation pit is dewatered, and PVC drainage pipes and pneumatic dewatering devices connected to the PVC drainage pipes are put into the existing rainwater and sewage inspection well II and the existing rainwater and sewage inspection well III to pump out the rainwater and sewage in the closed section. At the same time, the PVC drainage pipes are incorporated into the foundation pit dewatering system to uniformly precipitate, filter and reuse the dewatered water.

[0017] As a further preferred embodiment, step five also includes the following steps: arranging pressure grouting holes, and grouting the base layer under the existing pipeline foundation of the existing pipeline III through the pressure grouting holes, performing base treatment on the base layer after the grouting is cured, and the top surface of the base treatment is flush with the bottom surface of the existing pipeline foundation, and performing chemical anchoring on the two sides of the existing pipeline foundation of the existing pipeline III, one end of the chemical anchoring extends to a set position in the existing pipeline foundation, and the other end extends to the pressure grouting hole, and the existing pipeline foundation of the existing pipeline III near one end of the newly built rainwater and sewage inspection well V is chiseled downward by 50mm, and a pre-embedded steel plate is embedded, one end of the pre-embedded steel plate is connected to the existing pipeline III, and the other end extends to the foundation of the newly built rainwater and sewage inspection well to be poured, and the pre-embedded steel plate coincides with the central axis of the outer wall of the newly built rainwater and sewage inspection well V, and the newly built rainwater and sewage inspection well foundation is poured between the pressure grouting hole and the existing pipeline foundation, and maintained to the design strength.

[0018] As a further preferred embodiment, in step six, at the intersection of the existing pipeline III after cutting and the new rainwater and sewage inspection well V to be built, an annular groove is opened along the radial outer surface of the existing pipeline III, a steel mesh is laid in the notch of the annular groove, and an annular galvanized waterstop steel plate is installed on the radial outer surface of the annular groove. The two ends of the galvanized waterstop steel plate are respectively welded and fixed to the embedded steel plate, and the galvanized waterstop steel plate is arranged vertically to the steel mesh, and the annular groove is filled with a cement-based penetrating crystallization waterproof coating.

[0019] As a further preference, the width and depth of the annular groove are both 20 mm to 30 mm.

[0020] As a further preferred embodiment, in step seven, after the casting of the newly built rainwater and sewage inspection well V is completed, waterproof sealant is applied to the internal and external joints between the existing pipeline III and the newly built rainwater and sewage inspection well V, and the thickness of the waterproof sealant is 30mm to 50mm.

[0021] As a further preference, in step one, a water pump with specified power is used to discharge the water in the existing rainwater and sewage inspection well I from the upstream to the existing rainwater and sewage inspection well IV downstream around the clock, wherein the existing rainwater and sewage inspection well I and the existing rainwater and sewage inspection well IV are connected by a temporary diversion pipe, and the water pumping time is from before the plugging to the completion of the construction.

[0022] As a further preferred embodiment, in step 2, a sealing air bag is used to close the downstream pipeline of the existing rainwater and sewage inspection well I and the existing pipeline III between the existing rainwater and sewage inspection well IV.

[0023] According to another aspect of the present invention, a structure for diverting and transforming underground rainwater and sewage pipes is provided. For an existing pipe III that needs to be transformed, an existing rainwater and sewage inspection well III and an existing rainwater and sewage inspection well I are sequentially connected upstream, and an existing rainwater and sewage inspection well II and an existing rainwater and sewage inspection well IV are sequentially connected downstream, including:

[0024] A temporary diversion pipe module for discharging water from the existing rainwater and sewage inspection well I to the downstream existing rainwater and sewage inspection well IV;

[0025] Pipeline sealing airbags used to seal the downstream pipe of the existing rainwater and sewage inspection well I and the upstream pipe of the existing rainwater and sewage inspection well IV;

[0026] A new rainwater and sewage inspection well V is provided on the existing pipeline III, the base of the new rainwater and sewage inspection well V is provided with a pressure grouting hole and a concrete foundation connected to the pressure grouting, a new rainwater and sewage inspection well foundation is provided on the concrete foundation, the new rainwater and sewage inspection well foundation is provided on both sides of the existing pipeline foundation of the existing pipeline III, and the existing pipeline foundation and the new rainwater and sewage inspection well foundation are connected internally by multiple chemical embedded steel bars, an embedded steel plate is provided on the existing pipeline foundation, an annular groove is opened on the existing pipeline III, a steel mesh is laid in the annular groove, an annular galvanized waterstop steel plate is installed in the annular groove perpendicular to the outer wall of the existing pipeline III, both sides of the galvanized waterstop steel plate are welded and fixed to the embedded steel plates, and the annular groove is filled with a cement-based penetrating crystallization waterproof coating;

[0027] A new rainwater and sewage pipe connected to the new rainwater and sewage inspection well V and a new pipe concrete foundation located below the new rainwater and sewage pipe.

[0028] In general, the above technical solutions conceived by the present invention have the following technical advantages compared with the existing technology:

[0029] 1. This invention combines the inherent characteristics of underground stormwater and sewage pipes and the specific features of diversion and reconstruction construction to design a corresponding underground stormwater and sewage pipe diversion and reconstruction construction method and diversion reconstruction structure. This ensures the drainage circulation of existing stormwater and sewage pipes during the construction of new stormwater and sewage pipes, ensuring the normal operation of the stormwater and sewage pipeline system, especially resisting the drainage pressure during construction during flood season. Through a series of technological measures, the integrity of the foundation of the newly built stormwater and sewage inspection well is improved, and the adhesion and waterproof performance between the pipe and the well chamber are enhanced.

[0030] 2. This invention achieves drainage circulation in existing rainwater and sewage pipelines during the construction of new ones, ensuring the normal operation of the rainwater and sewage pipeline system, especially resisting the drainage pressure during construction during flood season. This significantly reduces construction costs and shortens construction time.

[0031] 3. This invention pumps out rainwater and sewage within the enclosed section, integrating the drainage network into the foundation pit drainage system for unified sedimentation, filtration, and secondary utilization of the drainage, thus promoting water-saving benefits in green construction.

[0032] 4. The present invention arranges pressure grouting holes below the foundation of the newly built rainwater and sewage inspection well and performs high-pressure grouting to reinforce the foundation, thereby improving the strength and stability of the newly built rainwater and sewage inspection well foundation.

[0033] 5. This invention employs chemical rebar embedding on both sides of the existing pipeline foundation, improving the integrity of the newly constructed stormwater and sewage manhole foundation. A pre-embedded steel plate is placed on the top surface of the manhole foundation. A circular groove is cut into the outer surface of the pipe, and a wire mesh is laid within the groove. A circular galvanized waterstop plate is installed perpendicular to the outer wall of the pipe, and its sides are welded to the pre-embedded steel plate. The groove is filled with a cement-based penetrating crystallized waterproof coating, and waterproof sealant is applied to the internal and external joints between the pipe and manhole. This improves the adhesion and waterproofing performance between the pipe and manhole. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a flow chart of a construction method for diverting and reconstructing underground rainwater and sewage pipes according to the present invention;

[0035] Figure 2 This is a schematic diagram of an underground rainwater and sewage pipe before diversion modification according to the present invention;

[0036] Figure 3 This is a structural diagram of temporary diversion and foundation pit support in the diversion and reconstruction of underground rainwater and sewage pipes according to the present invention;

[0037] Figure 4 This is a structural diagram of the new pipe foundation construction in the diversion and reconstruction of underground rainwater and sewage pipes according to the present invention;

[0038] Figure 5 This is a structural diagram of the foundation construction of a new rainwater and sewage inspection well in the diversion and reconstruction of an underground rainwater and sewage pipe according to the present invention;

[0039] Figure 6 This is a radial interface diagram of the foundation construction of a new rainwater and sewage inspection well in the diversion and reconstruction of an underground rainwater and sewage pipe according to the present invention;

[0040] Figure 7 This is a structural diagram of the sealing and fixing construction of the existing pipe section III in the underground rainwater and sewage pipe diversion transformation of the present invention;

[0041] Figure 8 This is another structural diagram of the sealing and fixing construction of the existing pipe section III in the underground rainwater and sewage pipe diversion reconstruction of the present invention;

[0042] Figure 9 It is a structural schematic diagram of the construction of an existing rainwater and sewage inspection well V in the diversion and transformation of an underground rainwater and sewage pipe according to the present invention.

[0043] In all the drawings, the same reference numerals represent the same technical features, specifically: #1 - Existing rainwater and sewage inspection well I; #2 - Existing rainwater and sewage inspection well II; #3 - Existing rainwater and sewage inspection well III; #4 - Existing rainwater and sewage inspection well IV; G1 - Existing pipeline I; G2 - Existing pipeline II; G3 - Existing pipeline III; 1 - Larsen steel sheet pile support; 2 - Pipeline plugging airbag I; 3 - Pipeline plugging airbag II; 4 - Foundation pit lateral support; 5 - Drainage pipeline; 6 - Pneumatic dewatering device; 7 - Temporary diversion pipe; 8-22KW water pump; 9-concrete foundation of new pipeline; 10-new rainwater and sewage pipeline; 11-existing pipeline foundation; 12-pipeline cutting; 13-base; 14-foundation of new rainwater and sewage inspection well; 15-chemical anchoring; 16-pressure grouting hole; 17-grouting reinforcement; 18-annular galvanized waterstop steel plate; 19-roughening treatment; 20-base treatment; 21-cement-based penetrating crystallization waterproof coating; 22-steel mesh; 23-steel purlin; 24-embedded steel plate; 25-waterproof sealant. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0045] like Figure 1As shown, an underground rainwater and sewage pipe diversion and reconstruction construction method provided by an embodiment of the present invention is suitable for the modification and expansion of rainwater and sewage projects, and the implementation steps are as follows: use a temporary diversion pipe to realize the upstream and downstream drainage connection; professional divers seal the upstream and downstream rainwater and sewage pipes; drive the pipe foundation trench support piles, and grout the inner corners where the enclosure structure meets to reinforce them; dewater the foundation pit, pump out the rainwater and sewage in the closed section, and incorporate the drainage pipe network into the foundation pit dewatering system; excavate the pipe foundation trench in layers to the designed base, construct a new pipe concrete foundation and a new rainwater and sewage pipe; cut the existing pipe; and high-pressure cement grouting below the foundation of the new rainwater and sewage inspection well. Solidify and improve the foundation strength and stability of the newly built rainwater and sewage inspection well; treat the base layer, roughen, level and remove surface impurities; chemically plant steel bars on both sides of the existing pipeline foundation and pre-embed steel plates; cast the foundation of the newly built rainwater and sewage inspection well and maintain it to the designed strength; open an annular groove on the outer surface of the pipeline; lay a steel mesh in the groove, and install an annular galvanized water-stop steel plate perpendicular to the outer wall of the pipeline; fill the groove with a cement-based penetrating crystallization waterproof coating; roughen the top surface of the foundation, tie the steel bars, and cast the well chamber concrete; apply waterproof sealant to the internal and external joints between the pipeline and the well chamber; backfill and tamp in layers to the designed top surface, remove the sealing airbag, stop the rainwater and sewage pumping, and restore the original state. The present invention ensures the drainage cycle of the existing rainwater and sewage pipeline during the construction of the new rainwater and sewage pipeline, realizes the normal operation of the rainwater and sewage pipeline system, and especially resists the drainage pressure during the construction process during the flood season. Through a series of process measures, the integrity of the foundation of the newly built rainwater and sewage inspection well is improved, and the adhesion and waterproof performance between the pipeline and the well chamber are improved.

[0046] Underground rainwater and sewage pipe diversion and reconstruction project Figure 2 In the figure, #1, #2, #3, #4, G1, G2, and G3 are all existing stormwater and sewage pipes. Newly constructed #5 and G4 are part of the planned drainage system within the plot area and connect to G3. The underground stormwater and sewage pipe diversion and reconstruction construction method disclosed herein is suitable for renovation and expansion of stormwater and sewage projects. It allows the construction of new stormwater and sewage pipes and inspection wells to be completed while ensuring the normal operation of existing stormwater and sewage pipes.

[0047] For the existing pipeline III that needs to be renovated, its upstream is provided with the existing rainwater and sewage inspection well III and the existing rainwater and sewage inspection well I in sequence, and its downstream is provided with the existing rainwater and sewage inspection well II and the existing rainwater and sewage inspection well IV in sequence. The renovation construction method includes the following steps:

[0048] Step 1, such as Figure 3As shown, a temporary diversion pipe is used to discharge the water in the existing rainwater and sewage inspection well I to the existing rainwater and sewage inspection well IV downstream. More specifically, a water pump with a specified power is used to discharge the water in the existing rainwater and sewage inspection well I from the upstream to the existing rainwater and sewage inspection well IV downstream around the clock. The existing rainwater and sewage inspection well I and the existing rainwater and sewage inspection well IV are connected by a temporary diversion pipe, and the water pumping time is from before the plugging to the completion of the construction.

[0049] Step 2, such as Figure 3 As shown, the downstream pipeline of the existing rainwater and sewage inspection well I and the upstream pipeline of the existing rainwater and sewage inspection well IV are blocked and drained, so that the existing pipeline III is in a closed and waterless state.

[0050] Step three, such as Figure 3 As shown, trench foundation pit support and foundation pit excavation are carried out within the design scope, the foundation pit is dewatered, a new pipeline concrete foundation is constructed on the designed base of the foundation pit, and a new rainwater and sewage pipeline is laid on the newly constructed pipeline concrete foundation. In this step, the support piles of the trench foundation pit support are set within 5m to 10m downwards between the existing rainwater and sewage inspection well Ⅰ and the existing rainwater and sewage inspection well Ⅳ. The inner corners where the retaining structures of the trench foundation pit support meet should be reinforced with triaxial mixing piles or high-pressure deep grouting according to the soil quality and groundwater conditions to prevent groundwater from flowing into the foundation pit through the intersection gap. Steel purlins are arranged around the retaining structure, and foundation pit transverse supports are installed at 4m intervals along the longitudinal direction of the existing pipeline foundation pit, and dewatering wells are arranged in the foundation pit. After the trench foundation pit support is completed, the foundation pit is dewatered. PVC drainage pipes and pneumatic dewatering devices connected to the PVC drainage pipes are put into the existing rainwater and sewage inspection wells II and III to pump out the rainwater and sewage in the closed section. At the same time, the PVC drainage pipes are incorporated into the foundation pit dewatering system to uniformly precipitate, filter and reuse the dewatered water.

[0051] Step 4: Figure 3 As shown, the existing pipeline III is cut and the cutting width is set according to the newly built rainwater and sewage inspection well V.

[0052] Step five, such as Figures 4 to 8As shown, the foundation of the newly built rainwater and sewage inspection well V is reinforced and cured to the design strength. This step also includes: arranging pressure grouting holes, and grouting the base layer under the existing pipeline foundation of the existing pipeline III through the pressure grouting holes, performing base treatment on the base layer after the grouting solidifies, with the top surface of the base treatment flush with the bottom surface of the existing pipeline foundation, and chemically planting rebar on both sides of the existing pipeline foundation of the existing pipeline III. One end of the chemical planting rebar extends to a set position in the existing pipeline foundation, and the other end extends to the pressure grouting hole. The existing pipeline foundation of the existing pipeline III near the end of the newly built rainwater and sewage inspection well V is chiseled down 50mm, and a pre-embedded steel plate is pre-embedded. One end of the pre-embedded steel plate is connected to the existing pipeline III, and the other end extends to the foundation of the newly built rainwater and sewage inspection well to be cast. The pre-embedded steel plate coincides with the central axis of the outer wall of the newly built rainwater and sewage inspection well V. The foundation of the newly built rainwater and sewage inspection well is cast between the pressure grouting hole and the existing pipeline foundation, and cured to the design strength.

[0053] Step six, such as Figure 9 As shown, a new rainwater and sewage inspection well V is cast, and waterproofing is performed at the interface between the existing pipeline III and the newly built rainwater and sewage inspection well V. At the interface between the existing pipeline III after cutting and the newly built rainwater and sewage inspection well V, an annular groove is cut along the radial outer surface of the existing pipeline III. A steel mesh is laid in the notch of the annular groove. An annular galvanized waterstop steel plate is installed on the radial outer surface of the annular groove. The two ends of the galvanized waterstop steel plate are respectively welded to the embedded steel plate, and the galvanized waterstop steel plate is arranged perpendicular to the steel mesh. The annular groove is filled with a cement-based penetrating crystallization waterproof coating. The width and depth of the annular groove are both 20mm to 30mm.

[0054] Step 7: Backfill and compact the foundation pit in layers to the designed top surface, remove the foundation pit support structure, remove the sealing device, remove the temporary diversion pipe, and remove the sealing airbag to restore the rainwater and sewage discharge to its original state. After the new rainwater and sewage inspection well V is cast, apply waterproof sealant to the internal and external joints between the existing pipeline III and the new rainwater and sewage inspection well V. The thickness of the waterproof sealant should be 30mm to 50mm.

[0055] In the above embodiment, the excavation of the foundation pit and the pouring of the new rainwater and sewage inspection well V belong to the existing technology, so the present invention does not repeat them.

[0056] According to another aspect of the present invention, a structure for diverting and transforming underground rainwater and sewage pipes is provided. For an existing pipe III that needs to be transformed, an existing rainwater and sewage inspection well III and an existing rainwater and sewage inspection well I are sequentially connected upstream, and an existing rainwater and sewage inspection well II and an existing rainwater and sewage inspection well IV are sequentially connected downstream, including:

[0057] A temporary diversion pipe module for discharging water from the existing rainwater and sewage inspection well I to the downstream existing rainwater and sewage inspection well IV;

[0058] Pipeline sealing airbags used to seal the downstream pipe of the existing rainwater and sewage inspection well I and the upstream pipe of the existing rainwater and sewage inspection well IV;

[0059] A new rainwater and sewage inspection well V is provided on the existing pipeline III, the base of the new rainwater and sewage inspection well V is provided with a pressure grouting hole and a concrete foundation connected to the pressure grouting, a new rainwater and sewage inspection well foundation is provided on the concrete foundation, the new rainwater and sewage inspection well foundation is provided on both sides of the existing pipeline foundation of the existing pipeline III, and the existing pipeline foundation and the new rainwater and sewage inspection well foundation are connected internally by multiple chemical embedded steel bars, an embedded steel plate is provided on the existing pipeline foundation, an annular groove is opened on the existing pipeline III, a steel mesh is laid in the annular groove, an annular galvanized waterstop steel plate is installed in the annular groove perpendicular to the outer wall of the existing pipeline III, both sides of the galvanized waterstop steel plate are welded and fixed to the embedded steel plates, and the annular groove is filled with a cement-based penetrating crystallization waterproof coating;

[0060] A new rainwater and sewage pipe connected to the new rainwater and sewage inspection well V and a new pipe concrete foundation located below the new rainwater and sewage pipe.

[0061] As a preferred embodiment of the present invention, the pipe-sealing airbag is an adjustable-diameter pipe-sealing airbag. More specifically, the adjustable-diameter pipe-sealing airbag comprises a retractable steel frame and an outer airbag, the outer airbag being encased within the retractable steel frame. The retractable steel frame is connected to a controller via a communication device, and the outer airbag is sealed to a pressurized inflation device via a pipe. Furthermore, the retractable steel frame comprises a fixed center rod arranged axially along the pipe, and at least three hydraulic telescopic rods are evenly arranged along a radial interface of the fixed center rod. The top ends of the hydraulic telescopic rods within the same radial interface are movably connected to elastically engaging circular devices. Specifically, one end of the hydraulic telescopic rod is fixedly connected to the fixed center rod, and the other end is movably connected to the elastically engaging circular device. More specifically, the elastic snap-fit ​​circle device comprises an integrally formed elastic main body and an elastic snap-fit ​​member. The elastic main body is hollow, with one end of the elastic snap-fit ​​member fixedly connected to the elastic main body and the other end extending into the hollow structure of the elastic main body. The sidewall of the elastic main body is provided with a plurality of concave retaining holes, and correspondingly, the sidewall of the elastic snap-fit ​​member is provided with a plurality of raised snap-fits corresponding to the concave retaining holes. The radial inner walls of the elastic main body and the elastic snap-fit ​​member are provided with a slide groove for the hydraulic telescopic rod to slide. In this manner, by controlling the extension and contraction of the hydraulic telescopic rod, the elastic main body and the elastic snap-fit ​​member are driven to extend or contract, thereby changing the length by which the elastic snap-fit ​​member extends into or out of the elastic main body, thereby changing the size of the circle formed by the elastic main body and the elastic snap-fit ​​member to accommodate different pipe diameters. When the circle formed by the elastic main body and the elastic snap-fit ​​member contacts the pipe wall, the outer airbag is inflated, thereby sealing the pipe. In the present invention, a power supply motor is also provided on the fixed center rod to power the communication device and the hydraulic telescopic rod.

[0062] More specifically, in one embodiment of the present invention, the method includes:

[0063] (1) To achieve drainage circulation of the existing rainwater and sewage pipeline during the construction of the new rainwater and sewage pipeline, two 22 kW water pumps are used to discharge water from upstream inspection well #1 to downstream inspection well #4 through a temporary diversion pipe 24 hours a day. The pumping time is from before the plugging to the completion of the construction. The pumping flow is calculated and confirmed to meet the requirements of the pump station. The temporary diversion pipe can be a water hose, and the pipe diameter is selected based on the calculated pumping flow.

[0064] (2) Plugging of the rainwater and sewage pipes G1 and G2 downstream of #1 and upstream of #4. To ensure the safety and reliability of the plugging, professional divers were employed to seal the section of pipe G3 between #1 and #4 using a plugging airbag.

[0065] (3) Install support piles for the pipe foundation trench. The range of support piles is as follows: ① 5m to 10m from the top of #1 to the bottom of #4; ② Build a new rainwater and sewage pipe foundation trench. The range is confirmed by the design. The inner corners where the retaining structures meet should be reinforced with triaxial mixing piles or high-pressure deep grouting according to the soil and groundwater conditions to prevent groundwater from flowing into the foundation trench through the joint gap. Steel purlins are arranged around the retaining structure to improve the overall stability of the retaining structure. Install foundation pit transverse supports at 4m intervals along the longitudinal direction of the pipeline foundation trench. Arrange drainage wells in the foundation pit.

[0066] (4) After the foundation pit support structure is completed, the foundation pit is dewatered. PVC drainage pipes are placed in #2 and #3, and a pneumatic dewatering device is installed on the top to pump out the rainwater and sewage in the closed section. The drainage pipe network is incorporated into the foundation pit dewatering system, and the dewatering water is uniformly precipitated, filtered, and reused.

[0067] (5) Excavate the pipeline foundation trench in layers to the designed base, and construct the concrete foundation of the new pipeline and the new rainwater and sewage pipeline. Cut the existing G3 pipeline, and the cutting width is determined according to the size of the new #5 pipeline.

[0068] (6) Arrange two pressure grouting holes below the foundation of the newly built #5 rainwater and sewage inspection well, and carry out high-pressure grouting reinforcement. The grouting range is 3m outside the inspection well foundation plane and 3m below the foundation bottom surface. Improve the strength and stability of the foundation of the newly built rainwater and sewage inspection well.

[0069] (7) Treat the base after grouting and curing, chisel, level and remove surface impurities. Carry out chemical rebar planting on both sides of the existing pipeline foundation. Chisel 50mm downwards from the existing pipeline foundation near the contact surface of #5 and G3 and the outer side of G3, and embed a steel plate. One end of the steel plate is close to the interface between the pipeline and the foundation. The length is 300mm to 500mm and the width is 1 / 2 of the outer wall of the well chamber. The axis of the steel plate coincides with the center axis of the outer wall of #5. Pour the foundation of the new rainwater and sewage inspection well and maintain it to the design strength.

[0070] (8) After the cutting is completed, the intersection of G3 and the #5 to be built is opened on the outer surface of the pipe. The width and depth of the groove are both 20mm to 30mm. A wire mesh is laid in the groove. An annular galvanized waterstop steel plate is installed perpendicular to the outer wall of the pipe. The two sides of the galvanized waterstop steel plate are welded and fixed to the embedded steel plate. The groove is filled with a cement-based penetrating crystallization waterproof coating.

[0071] (9) Roughen the top surface of the foundation, tie the #5 steel bars, and pour the #5 concrete.

[0072] (10) Apply waterproof sealant to the internal and external joints between the pipeline and the well chamber with a thickness of 30mm to 50mm.

[0073] (11) Backfill and compact the foundation pit layer by layer to the designed top surface. Remove the foundation pit retaining structure in the order of horizontal support → steel purlin → support pile. Remove the blocking airbag, stop the drainage of rainwater and sewage, and restore the original state.

[0074] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for diverting and reconstructing underground rainwater and sewage pipes, characterized in that: For the existing pipeline III that needs to be renovated, its upstream is provided with the existing rainwater and sewage inspection well III and the existing rainwater and sewage inspection well I in sequence, and its downstream is provided with the existing rainwater and sewage inspection well II and the existing rainwater and sewage inspection well IV in sequence. The renovation construction method includes the following steps: Step 1: Use a temporary diversion pipe to discharge the water in the existing rainwater and sewage inspection well I to the existing rainwater and sewage inspection well IV downstream; Step 2: Block and drain the downstream pipeline of the existing rainwater and sewage inspection well I and the upstream pipeline of the existing rainwater and sewage inspection well IV, so that the existing pipeline III is closed and water-free; Step 3: Carry out trench foundation pit support and excavation within the design scope, dewater the foundation pit, construct a new pipeline concrete foundation at the designed base of the foundation pit, and lay a new rainwater and sewage pipeline on the new pipeline concrete foundation; Step 4: Cut the existing pipeline III, and the cutting width is set according to the newly built rainwater and sewage inspection well V; Step 5: Strengthen the foundation of the newly built rainwater and sewage inspection well V and maintain it to the designed strength; Step five also includes the following steps: arranging pressure grouting holes, and grouting the base layer under the existing pipeline foundation of the existing pipeline III through the pressure grouting holes, performing base treatment on the base layer after the grouting solidifies, with the top surface of the base treatment flush with the bottom surface of the existing pipeline foundation, performing chemical planting on both sides of the existing pipeline foundation of the existing pipeline III, with one end of the chemical planting extending to a set position in the existing pipeline foundation, and the other end extending to the pressure grouting hole, chiseling 50mm downward from the existing pipeline foundation near one end of the newly built rainwater and sewage inspection well V of the existing pipeline III, and pre-embedded steel plates, with one end of the pre-embedded steel plates connected to the existing pipeline III, and the other end extending to the foundation of the newly built rainwater and sewage inspection well to be poured, and the pre-embedded steel plates coincide with the central axis of the outer wall of the newly built rainwater and sewage inspection well V, pouring the foundation of the newly built rainwater and sewage inspection well between the pressure grouting hole and the existing pipeline foundation, and curing to the design strength; Step 6: Concrete a new rainwater and sewage inspection well V and perform waterproofing on the interface between the existing pipeline III and the new rainwater and sewage inspection well V; Step seven: Backfill and compact the foundation pit in layers to the designed top surface, remove the foundation pit support structure, remove the sealing device, and remove the temporary diversion pipe to restore the discharge of rainwater and sewage to its original state.

2. A construction method for diverting and reconstructing underground rainwater and sewage pipes according to claim 1, characterized in that: In step 3, trench foundation pit support and foundation pit excavation within the design scope include: The support piles for the trench foundation pit support are set within 5m to 10m downwards from the existing rainwater and sewage inspection well Ⅰ to the shaped rainwater and sewage inspection well Ⅳ. The inner corners where the retaining structures of the trench foundation pit support meet should be reinforced with three-axis mixing piles or high-pressure deep grouting according to the soil and groundwater conditions to prevent groundwater from flowing into the foundation pit through the junction gaps. Steel purlins are arranged around the retaining structure, and horizontal supports for the foundation pit are installed at 4m intervals along the longitudinal direction of the existing pipeline foundation pit, and precipitation wells are arranged in the foundation pit.

3. The construction method for diverting and reconstructing underground rainwater and sewage pipes according to claim 1, characterized in that: In step three, after the trench foundation pit support is completed, the foundation pit is dewatered, and PVC drainage pipes and pneumatic dewatering devices connected to the PVC drainage pipes are put into the existing rainwater and sewage inspection well II and the existing rainwater and sewage inspection well III to pump out the rainwater and sewage in the closed section. At the same time, the PVC drainage pipes are incorporated into the foundation pit dewatering system to uniformly precipitate, filter and reuse the dewatered water.

4. The construction method for diverting and reconstructing underground rainwater and sewage pipes according to claim 1, characterized in that: In step six, at the intersection of the existing pipeline III after cutting and the new rainwater and sewage inspection well V to be built, an annular groove is opened along the radial outer surface of the existing pipeline III, a steel mesh is laid in the notch of the annular groove, and an annular galvanized waterstop steel plate is installed on the radial outer surface of the annular groove. The two ends of the galvanized waterstop steel plate are respectively welded and fixed to the embedded steel plate, and the galvanized waterstop steel plate is arranged vertically to the steel mesh, and the annular groove is filled with a cement-based penetrating crystallization waterproof coating.

5. A construction method for diverting and reconstructing underground rainwater and sewage pipes according to claim 4, characterized in that: The width and depth of the annular groove are both 20 mm to 30 mm.

6. The construction method for diverting and reconstructing underground rainwater and sewage pipes according to claim 1, characterized in that: In step seven, after the pouring of the newly built rainwater and sewage inspection well V is completed, waterproof sealant is applied to the internal and external joints between the existing pipeline III and the newly built rainwater and sewage inspection well V. The thickness of the waterproof sealant is 30mm to 50mm.

7. The construction method for diverting and reconstructing underground rainwater and sewage pipes according to claim 1, characterized in that: In step one, a water pump with specified power is used to discharge the water in the existing rainwater and sewage inspection well I from the upstream to the existing rainwater and sewage inspection well IV downstream around the clock. Among them, the existing rainwater and sewage inspection well I and the existing rainwater and sewage inspection well IV are connected by a temporary diversion pipe, and the water pumping time is from before the plugging to the completion of the construction.

8. The construction method for diverting and reconstructing underground rainwater and sewage pipes according to claim 1 is characterized in that: In step 2, a sealing air bag is used to close the downstream pipeline of the existing rainwater and sewage inspection well Ⅰ and the existing pipeline Ⅲ between the existing rainwater and sewage inspection well Ⅳ.

9. A structure for diverting and reconstructing underground rainwater and sewage pipes, wherein for the existing pipe III to be reconstructed, the upstream of the pipe is provided with connected existing rainwater and sewage inspection wells III and I, and the downstream of the pipe is provided with connected existing rainwater and sewage inspection wells II and IV, characterized in that: include: A temporary diversion pipe module for discharging water from the existing rainwater and sewage inspection well I to the downstream existing rainwater and sewage inspection well IV; Pipeline sealing airbags used to seal the downstream pipe of the existing rainwater and sewage inspection well I and the upstream pipe of the existing rainwater and sewage inspection well IV; A new rainwater and sewage inspection well V is provided on the existing pipeline III, the base of the new rainwater and sewage inspection well V is provided with a pressure grouting hole and a concrete foundation connected to the pressure grouting, a new rainwater and sewage inspection well foundation is provided on the concrete foundation, the new rainwater and sewage inspection well foundation is provided on both sides of the existing pipeline foundation of the existing pipeline III, and the existing pipeline foundation and the new rainwater and sewage inspection well foundation are connected internally by multiple chemical embedded steel bars, an embedded steel plate is provided on the existing pipeline foundation, an annular groove is opened on the existing pipeline III, a steel mesh is laid in the annular groove, an annular galvanized waterstop steel plate is installed in the annular groove perpendicular to the outer wall of the existing pipeline III, both sides of the galvanized waterstop steel plate are welded and fixed to the embedded steel plates, and the annular groove is filled with a cement-based penetrating crystallization waterproof coating; A new rainwater and sewage pipe connected to the new rainwater and sewage inspection well V and a new pipe concrete foundation located below the new rainwater and sewage pipe.

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