A method and equipment for sealing leaking rainwater and sewage well chambers.

Abstract

This invention discloses a method and equipment for sealing leaking rainwater and sewage well chambers. The method includes: excavating earth to the point of leakage, cleaning the well chamber and compacting the excavation surface; constructing a brick masonry layer on the excavation surface and sealing the gaps between the brick structure and the well chamber; wrapping wire mesh tightly around the leak point, ensuring it fits snugly against the well chamber; installing PVC pipes and wrapping them around the leaking well chamber; installing steel molds around the well chamber and connecting the upper ends of the PVC pipes to a displacement box; installing a vacuum pump to ensure the discharge of rainwater and sewage; adjusting the vacuum pump and pouring concrete into the steel molds; temporarily shutting down the vacuum pump, removing the temporary seal, connecting the concrete pump box, and using the displacement box and vacuum pump to seal the PVC pipes with concrete slurry; after sealing, removing the excess PVC pipes and steel molds at both ends; and waterproofing the top of the poured concrete. This invention reduces construction costs and time, effectively controls the spread of rainwater and sewage during construction, and improves the working environment for workers to some extent.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and more specifically, relates to a method and equipment for sealing leaking rainwater and sewage well chambers. Background Technology

[0002] With the increasing prevalence of renovation and expansion of stormwater and sewage projects in municipal construction, construction techniques are also constantly improving. Most of the original manholes are brick structures, but when renovating or expanding stormwater and sewage manholes, earthwork excavation often causes disturbance, damage, or even leakage of the manholes. Leakage of the manholes can easily lead to difficulties in drainage of the foundation pit project to ensure the retaining structure formed by downward excavation, groundwater control, and environmental protection; increase the safety hazards of the underground space structure formed by downward excavation; paralyze the original pipelines; and prolong the construction period of stormwater and sewage manholes.

[0003] In the existing technology, the commonly used methods for sealing well chambers are: setting up a soft waterproof material channel in the well chamber and setting up multiple variable diameter steel ring support channels in the channel to seal the leakage of the well chamber wall during the construction period; sealing the well chamber and the pipeline with waterstop and concrete; and setting up a U-shaped hollow steel skeleton on the side wall of the well chamber and filling it with bagged clay. However, there are still some problems: (1) The soft waterproof material support can only be used as a temporary seal and cannot be used for permanent sealing. It is easy to have repeated leakage and can only be used as a method to improve the construction environment of well chamber sealing; (2) At present, the use of waterstop and concrete for permanent sealing is only applicable to the gap between the well chamber and the pipeline, or the connection between the well chamber and the well shaft, and does not consider how to deal with leakage in the well chamber wall; (3) The use of clay to fill the hollow skeleton has poor material utilization, high cost, and cannot guarantee the effectiveness of subsequent leakage sealing.

[0004] The problem this invention aims to solve is how to reduce costs while ensuring a safe working environment for workers, and how to permanently seal leaks in the well chamber walls. Summary of the Invention

[0005] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a method and equipment for sealing leaking rainwater and sewage well chambers. By using vacuum diversion, netting filling, and waterproof coating application, the well chamber can be sealed at low cost and high efficiency while in operation, thereby solving the above-mentioned technical problems.

[0006] To achieve the above objectives, according to a first aspect of the present invention, a method for sealing a leaking stormwater and sewage well chamber is provided, wherein the leakage point is located on the inner wall of the well chamber structure, comprising the following steps:

[0007] Step 1: Excavate the earthwork to the point of leakage, clean the area around the well chamber and compact the excavation surface around the well chamber, construct a brick masonry layer on the excavation surface, and seal the gap between the brick masonry structure and the well chamber.

[0008] Step 2: Wrap wire mesh around the leak point, ensuring the mesh fits tightly against the manhole, and then install PVC pipes to wrap around the leaking manhole.

[0009] Step 3: Install steel molds around the well chamber, connect the upper end of the PVC pipe to the replacement box, and install a vacuum pump to ensure the discharge of rainwater and sewage;

[0010] Step 4: Adjust the vacuum pump and pour the concrete into the steel mold to give it a certain strength;

[0011] Step 5: Temporarily shut down the vacuum pump, remove the seal from the lower end of the PVC pipe, connect the concrete box, and use the displacement box and vacuum pump to seal the inside of the PVC pipe with concrete slurry. After sealing, remove the excess PVC pipe and steel formwork at both ends; perform point waterproofing treatment on the top of the poured concrete and the upper end of the PVC pipe.

[0012] Furthermore, in step one, the gap between the brick masonry layer and the well chamber structure is sealed using acrylic hydrochloric acid or polysulfide sealant.

[0013] Furthermore, in step two, the wire mesh is of two different specifications; the denser wire mesh is mainly used to wrap around the leak point, while the less dense wire mesh is mainly used to wrap around the area within 0.5m above and below the leak point; the wire mesh of different specifications is wrapped around the well chamber structure where the leak point is located at least once and a half times; the two different specifications of wire mesh are 1.66mm and 3mm respectively.

[0014] Furthermore, in step two, the PVC pipe is tied to the outside of the wire mesh, and the two are tied together and fixed to the leaking area of ​​the well structure for at least one and a half weeks. After the PVC pipe is tied, more than 2m of pipe is left at both the top and bottom ends.

[0015] The PVC pipe has pressure relief outlet holes evenly spaced at the part of the pipe in contact with the leak point. The opening size is 5mm-10mm, the outlet holes are spaced 20mm apart, and the openings face the leak point.

[0016] Furthermore, the perforated portion of the PVC pipe is wrapped with non-woven geotextile, and the PVC pipe can be a corrugated pipe, steel pipe, or other flexible material.

[0017] Furthermore, in steps four and five, the concrete poured into the steel mold is crack-resistant fiber concrete, and the concrete grade must be equal to or higher than the concrete grade strength of the well structure, and not lower than C30 concrete.

[0018] After the C30 concrete reaches a certain strength, a two-step waterproofing treatment is performed on the top of the C30 concrete and the upper end of the PVC pipe using an acrylic hydrochloric acid waterproof coating.

[0019] According to a second aspect of the present invention, a sealing device for leaking rainwater and sewage well chambers is provided, comprising: a diversion unit, a sewage discharge unit, a steel membrane, C30 concrete, and a concrete pump box;

[0020] The drainage unit includes a wire mesh and a PVC pipe wrapped around the leak point located in the well chamber structure. The wire mesh is tightly wrapped around the leak point above and below, and the PVC pipe is wrapped around the wire mesh to jointly surround the leak point.

[0021] The sewage discharge unit includes a replacement box connected to the upper end of the PVC pipe, a vacuum pump connected to the replacement box, a temporary plug connected to the lower end of the PVC pipe, and a sewage discharge valve at the bottom of the replacement box.

[0022] Furthermore, after the lower end of the PVC pipe is temporarily sealed, the vacuum pump is tested to ensure normal operation. The PVC pipe is kept under negative pressure, allowing the leaked rainwater and sewage to accumulate inside the pipe. Once a certain amount is reached, the sewage flows into the replacement box and out through the drain valve, thus completing the drainage of rainwater and sewage.

[0023] Furthermore, when the PVC pipe is under continuous negative pressure, steel molds are set around the manhole structure and C30 concrete is poured to complete the external sealing.

[0024] Furthermore, the temporary seal at the lower end of the PVC pipe is removed after the concrete inside the steel membrane reaches a certain strength. The lower end of the PVC pipe is then connected to the concrete pump box, and the concrete slurry is pumped into the replacement tank using a vacuum pump. The internal pressure relief outlet of the PVC pipe is then sealed.

[0025] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0026] 1. The present invention provides a sealing device and method for leaking rainwater and sewage well chambers. By constructing a brick masonry layer above the excavation surface and filling the gap between the brick masonry structure and the well chamber with acrylate or polysulfide sealant, the airtightness between the two is ensured, which to a certain extent prevents the expansion of the leakage range and avoids the possibility of future leakage.

[0027] 2. This invention discloses a sealing device and method for leaking rainwater and sewage well chambers. It involves binding and fixing multiple layers of steel wire mesh and pipes, and uniformly opening pressure relief outlet holes in the pipe wall in contact with the leak point. Non-woven geotextile is wrapped around the pipe openings. The upper end of the pipe extends vertically upwards along the well chamber to the top of the rainwater and sewage well, connecting to a replacement box. The upper part of the replacement box is connected to a vacuum pump. This method allows for drainage of leaking water while the well chamber is in operation, completing the leak sealing and avoiding prolonged shutdown of the rainwater pipes, construction delays, and increased safety hazards caused by sealing. The technical measures improve sealing efficiency and allow for emergency repairs based on weather conditions, mitigating construction risks.

[0028] 3. The present invention provides a sealing device and method for leaking rainwater and sewage well chambers. By setting up a concrete pump box and a vacuum pump, the pipe is kept under negative pressure, allowing concrete slurry to flow from the bottom of the pipe to the replacement box, thus completing the pipe sealing. The two steps of applying an acrylic waterproof coating on the top ensure the sealing effect of the leakage points.

[0029] 4. The present invention provides a sealing device and method for leaking rainwater and sewage well chambers. By pouring crack-resistant fiber-reinforced concrete into a steel mold, and requiring the concrete grade and strength to be equal to or higher than the well chamber concrete, not lower than C30, the concrete strength is guaranteed, and the well chamber structure is protected against leakage to a certain extent, effectively avoiding the risk of leakage again in the later stage. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a rainwater and sewage well in a method and equipment for sealing a leaking rainwater and sewage well chamber according to an embodiment of the present invention;

[0031] Figure 2 This is a structural schematic diagram of the construction step one in a method and equipment for sealing leaking rainwater and sewage well chambers according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the second construction step in a method and equipment for sealing leaking rainwater and sewage wells according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the third construction step in a method and equipment for sealing leaking rainwater and sewage wells according to an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the fourth construction step in a method and equipment for sealing leaking rainwater and sewage wells according to an embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of the fifth construction step in a method and equipment for sealing leaking rainwater and sewage wells according to an embodiment of the present invention;

[0036] Figure 7This is a schematic diagram of the structure of a rainwater and sewage well after sealing construction, based on a method and equipment for sealing a leaking rainwater and sewage well according to an embodiment of the present invention.

[0037] Figure 8 This is a schematic diagram illustrating the construction process of a method and equipment for sealing leaking rainwater and sewage well chambers according to an embodiment of the present invention.

[0038] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-cast iron manhole cover and support, 2-manhole shaft, 3-concrete cover plate, 4-leakage point, 5-manhole structure, 6-pipeline, 7-pipeline foundation, 8-manhole foundation, 9-original soil, 10-wire mesh, 11-PVC pipe, 12-pressure relief outlet, 13-brick bedding layer, 14-C30 concrete, 15-steel formwork, 16-temporary sealing, 17-replacement box, 18-vacuum pump, 19-concrete pump box, 20-acrylate waterproof coating, 21-drain valve. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be 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 illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "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.

[0041] like Figure 1 As shown, an embodiment of the present invention provides a rainwater and sewage well chamber, wherein the rainwater and sewage well is established on undisturbed soil 9, specifically including:

[0042] The manhole foundation 8, the pipe foundation 7, and the pipe 6 laid horizontally on the pipe foundation 7 are provided on the original soil 9; the manhole structure 5 is set in the vertical direction of the pipe 6, and the manhole structure 5 is provided with a manhole 2 and a cast iron manhole cover and support 1 on the manhole 2; the manhole structure 5 and the manhole 2 are sealed by a concrete cover plate 3 to prevent rainwater and sewage leakage caused by gaps between them.

[0043] In this embodiment of the invention, the leakage point 4 of the rainwater and sewage well chamber is located on the well chamber structure 5, which is also a common leakage point in the current rainwater and sewage well leakage.

[0044] like Figures 2-6 As shown, this embodiment of the invention provides a sealing device for a leaking rainwater and sewage well chamber, which includes: a diversion unit for temporarily sealing and diverting the leaking area, a sewage discharge unit for treating the rainwater and sewage from the leaking area using the diversion unit, a steel mold 15 and C30 concrete 14 for permanently sealing the well chamber structure 5, and a concrete pump box 15.

[0045] The drainage unit includes: a wire mesh 10 for initially wrapping the leakage point 4 located on the well chamber structure 5, and a PVC pipe 11 for wrapping the leakage point 4 on the outer layer of the wire mesh 10; the PVC pipe 11 is provided with evenly distributed pressure relief outlet holes 12, and the openings face the leakage point 4; the openings of the PVC pipe 11 are also wrapped with non-woven geotextile to prevent the leakage range of the leakage point 4 from further expanding.

[0046] Specifically, the wire mesh 10 can be two or more meshes of different densities, and the PVC pipe 11 has a certain length of pipe left at both the upper and lower ends.

[0047] The sewage discharge unit includes: a displacement box 17 fixedly connected to the upper end of the PVC pipe 11 in the drainage unit and a vacuum pump 18 connected to the displacement box 17; and a removable temporary plug 16 is provided at the lower end of the PVC pipe 11.

[0048] Specifically, a drain valve 21 is also provided at the lower end of the replacement box 17.

[0049] When the sewage discharge unit cleans and discharges the rainwater and sewage at the leak point 4, the pressure relief outlets 12 evenly distributed towards the leak point 4 in the diversion unit and the vacuum pump 18 in the sewage discharge unit are used to divert the leaked rainwater and sewage into the PVC pipe 11. Then, the vacuum pump 18 pumps it to the replacement box 17 and discharges it through the sewage discharge valve 21. The negative pressure state inside the PVC pipe 11 is maintained to control the leakage range of the rainwater and sewage, reduce the damage caused by leakage, minimize leakage losses, and facilitate subsequent sealing.

[0050] When the PVC pipe 11 is kept under negative pressure, the leakage outside the manhole structure 5 is sealed by setting steel molds 15 around the manhole structure 5 and pouring C30 concrete 14 into the steel molds 15, so that the poured concrete has a certain strength after solidification.

[0051] Furthermore, the temporary plug 16 in the diversion unit is removed, and the lower end of the PVC pipe 11 is connected to the concrete pump box 15. Using the vacuum pump 18, concrete is pumped into the displacement box 17 so that the concrete slurry adheres inside the PVC pipe 11, thus sealing the leak at the pressure relief outlet 12. This achieves the sealing of the leaking rainwater and sewage well chamber provided in this embodiment. When leakage occurs in the well chamber structure, the diversion unit is used to temporarily seal the leakage point to control the leakage range and reduce leakage loss. Then, the sewage discharge unit is used to discharge sewage under negative pressure. By using the displacement box and vacuum pump in the sewage discharge unit to pressurize the rainwater and sewage, and at the same time, concrete is poured around the well chamber structure to complete the external anti-leakage sealing. Finally, the displacement box, vacuum pump, and concrete pump box connected to the lower end of the PVC pipe are used to fill and seal the pressure relief outlet at the leakage point with concrete, thereby achieving permanent external-internal sealing.

[0052] like Figure 8 As shown in the figure, this embodiment of the invention provides a method for sealing leaking rainwater and sewage well chambers. The sealing construction method includes the following steps:

[0053] S100: Excavate the earthwork to the point of leakage, clean the area around the well chamber and compact the excavation surface around the well chamber, construct a brick masonry layer on the excavation surface, and seal the gap between the brick masonry structure and the well chamber.

[0054] S200: Wrap wire mesh around the leak point to ensure a tight fit between the mesh and the manhole, and install PVC pipes to wrap around the leaking manhole.

[0055] S300: Steel molds are installed around the well chamber, and the upper end of the PVC pipe is connected to the replacement box. A vacuum pump is installed to ensure the discharge of rainwater and sewage.

[0056] S400: Adjust the vacuum pump to pour concrete into the steel mold and give it a certain strength;

[0057] S500: Temporarily shut down the vacuum pump, remove the seal at the lower end of the PVC pipe, connect the concrete box, and use the displacement box and vacuum pump to seal the inside of the PVC pipe with concrete slurry. After sealing, remove the excess PVC pipe and steel mold at both ends; perform point waterproofing treatment on the top of the poured concrete and the upper end of the PVC pipe.

[0058] like Figure 2 As shown, construction step S100 also includes:

[0059] 1. After the construction personnel have determined the location of the leak point 4, they shall excavate the earth to 0.5 to 1 meter below the leak point 4 and clean up the mud and debris around the manhole structure 5. During this construction process, in order to reduce the disturbance to the pipeline foundation and manhole foundation and thus generate new leak points, the construction process shall be carried out manually throughout the process, and the cast iron manhole cover and support 1 shall be kept closed. The construction specifications shall be strictly followed to ensure the safety of the personnel on site.

[0060] 2. Manually compact the excavation surface and construct a brick masonry layer 13 around the excavation surface, i.e., the manhole structure 5. The height of the layer should be 200mm to 300mm. After cleaning the joints between the brick masonry structure and the manhole structure 5, fill the joints with acrylate or polysulfide sealant to ensure the airtightness between the two, so as to prevent leakage again after the sealing construction is completed and reduce the degree of leakage.

[0061] like Figure 3 As shown, in construction step S200, firstly, within a 0.5m range above and below the leakage point 4, a steel wire mesh 10 with a density of 3mm is used to wrap the well chamber structure 5 within a 0.5m range above and below the leakage point 4 for at least one and a half turns. At the leakage point 4, an iron wire mesh 10 with a density higher than 3mm (e.g., 1.66mm iron wire mesh 10) is also used to wrap the leakage point 4 for at least one and a half turns, and the wrapped iron wire mesh 10 is tightly attached to the well chamber structure 5.

[0062] Then, wrap the PVC pipe 11 around the leak point 4 on the well structure 5 for more than three turns. At this time, the PVC pipe 11 is tied and fixed together with the previously wrapped wire mesh 10, and both are tightly attached to the well structure 5. Leave more than 2m of pipe at both the top and bottom of the PVC pipe 11 for subsequent sewage drainage and sealing.

[0063] Specifically, the PVC pipe 11 has pressure relief outlet holes 12 evenly distributed in the pipe portion that contacts the leak point 4, with the outlet holes facing the leak point 4. The opening size of the outlet holes is 5mm to 10mm, and the outlet holes are spaced 20mm apart. Within the pipe opening range, non-woven geotextile is wrapped around the holes of the pressure relief outlet holes 12. The PVC pipe 11 can be made of other waterproof, corrosion-resistant, and flexible materials such as corrugated pipes or steel pipes that can be wound around the well chamber structure 5.

[0064] In construction step S200, non-woven geotextile is wrapped around the pressure relief outlet 12 on the PVC pipe 11. To a certain extent, the non-woven geotextile can fit tightly to the leakage point 4 and can seal the leakage point 4 to a certain extent, so as to prevent rainwater and sewage from continuing to seep from the leakage point 4 after the wire mesh 10 is wrapped, thus controlling the leakage range.

[0065] like Figure 4As shown, in construction step S300, specifically, steel formwork 15 is installed around the well chamber structure 5, and the bottom of the steel formwork 15 is placed on the brick masonry pad 13. Mortar is applied to seal the gap between the steel formwork 15 and the brick masonry pad 13, and cement grout is applied to the bottom of the steel formwork 15 for fixation. During the placement of the steel formwork 15, its exterior can be simply supported and fixed using wooden boards, steel or other detachable materials to ensure that it is fixed to the brick masonry pad 13 with mud during the installation of the steel formwork 15 to prevent collapse.

[0066] Furthermore, the top of the steel mold 15 should be at least 0.5 meters higher than the four leakage points. After the steel mold 15 is fixedly installed, a hole is drilled at the lower end of the horizontally placed PVC pipe 11 on the outer wall of the steel mold 15 so that the lower end of the PVC pipe 11 passes horizontally out of the steel mold 15.

[0067] Furthermore, a temporary plug 16 is connected to the lower end of the PVC pipe 11. The upper end of the PVC pipe 11 extends vertically upwards along the manhole structure 5 and the manhole cylinder 2 to above the rainwater and sewage well, and its horizontal height is higher than the cast iron manhole cover and support 1. The upper end of the PVC pipe 11 is connected to the replacement box 17. The bottom of the replacement box 17 is equipped with a drain valve 21, and the replacement box 17 is connected to the vacuum pump 18. After the lower end of the PVC pipe 11 is plugged, the vacuum pump 18 is adjusted to operate normally and maintain a negative pressure state inside the PVC pipe 11, so that the leaking rainwater and sewage at the leakage point 4 are pumped into the PVC pipe 11. When the rainwater and sewage accumulate in the replacement box 17, they are discharged through the drain valve 21 at the bottom of the replacement box 17. During the process of rainwater and sewage leakage, the vacuum pump 18 provides a long-term negative pressure operation to ensure that the leaking water can flow into the PVC pipe 11 and prevent leakage to other areas.

[0068] like Figure 5 As shown, in construction step S400, specifically, the vacuum pump 18 is first debugged to ensure its normal operation and to ensure that all leaked rainwater and sewage flow into the PVC pipe 11; further, C30 concrete 14 with crack-resistant fibers is poured into the steel mold 15. The strength grade of the poured concrete should be equal to or higher than the concrete grade of the well chamber structure 5, well cylinder 2, and concrete cover 3, and the grade should not be lower than C30; since the operation of the vacuum pump 18 maintains the negative pressure state in the PVC pipe 11, it avoids rainwater and sewage from leaking into the poured concrete structure and affecting the concrete setting speed in the steel mold 15, thereby ensuring the quality of concrete pouring.

[0069] like Figures 6-7 As shown, construction step S500 also includes:

[0070] 1. After the C30 concrete 14 poured into the steel mold 15 has reached a certain strength, the vacuum pump 18 is temporarily shut off, and the temporary plug 16 connected to the lower end of the PVC pipe 11 is removed. The lower end of the PVC pipe 11 is then connected to the concrete pump box 19. At this time, the vacuum pump 18 is turned on again, so that the concrete slurry is drawn from the concrete pump box 19 through the PVC pipe 11 into the replacement box 17. At this time, the PVC pipe 11 is kept under negative pressure. When concrete slurry flows into the replacement box 17, the drain valve 21 and the vacuum pump 18 are closed to seal the concrete slurry in the PVC pipe 11 and achieve permanent sealing.

[0071] 2. After sealing is completed and the concrete poured inside the steel mold 15 has reached a certain strength, remove the concrete pump box 19, replacement box 17, and vacuum pump 18 connected to the upper and lower ends of the steel mold 15 and PVC pipe 11. At this time, the upper end of the PVC pipe 11 is located on top of the concrete poured in the steel mold 15. Furthermore, the construction personnel apply an acrylic hydrochloric acid waterproof coating 20 to this top to ensure its waterproofness and the seal between the concrete cover and the poured concrete.

[0072] 3. Backfill the excavated soil, compact it, and then clean the backfill surface.

[0073] The purpose of this invention is to solve the problem of how to permanently seal leaking rainwater and sewage well chambers, reasonably control costs, shorten the construction period, and protect the construction environment for workers. This invention proposes a method and equipment for sealing leaking rainwater and sewage well chambers. The method involves wrapping and binding the leak point with multiple layers of steel wire mesh of varying densities and PVC pipes with evenly distributed pressure relief holes. Non-woven geotextile is then wrapped around the holes in the PVC pipes. Temporary seals and a vacuum pump are used at both ends of the PVC pipes to collect and divert the leaking rainwater and sewage, ensuring that the rainwater and sewage do not spread to other parts of the well chamber, controlling the leakage range, and preventing continuous leakage from affecting the sealing effect. External sealing of the well chamber is achieved by setting up a steel mold around the well chamber structure and pouring high-strength concrete.

[0074] The concrete slurry inside the concrete pump box is then used to seal the inside of the PVC pipe, sealing the internal leak points and achieving a permanent external-internal seal for the leaking rainwater and sewage manholes. The construction method provided by this invention reduces construction costs and time, effectively controls the further spread of rainwater and sewage leakage during construction, improves the working environment for workers to some extent, and forms a complete sealing system, achieving permanent sealing of leaks.

[0075] Those skilled in the art will readily understand 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 within the scope of protection of the present invention.

Claims

1. A method for sealing a leaking stormwater and sewage well chamber, wherein the leak is located on the inner wall of the well chamber structure, characterized in that, Includes the following steps: Step 1: Excavate the earthwork to the point of leakage, clean the area around the well chamber and compact the excavation surface around the well chamber, construct a brick masonry layer on the excavation surface, and seal the gap between the brick masonry structure and the well chamber. Step 2: Wrap wire mesh around the leak point, ensuring the mesh fits tightly against the manhole, and then install PVC pipes to wrap around the leaking manhole. Step 3: Install steel molds around the well chamber, connect the upper end of the PVC pipe to the replacement box, and install a vacuum pump to ensure the discharge of rainwater and sewage; Step 4: Adjust the vacuum pump and pour the concrete into the steel mold to give it a certain strength; Step 5: Temporarily shut down the vacuum pump, remove the seal from the lower end of the PVC pipe, connect the concrete box, and use the displacement box and vacuum pump to seal the inside of the PVC pipe with concrete slurry. After sealing, remove the excess PVC pipe and steel formwork at both ends; perform point waterproofing treatment on the top of the poured concrete and the upper end of the PVC pipe.

2. The method for sealing leaking rainwater and sewage well chambers according to claim 1, characterized in that, In step one, the gap between the brick masonry layer and the well chamber structure is sealed using acrylic hydrochloric acid or polysulfide sealant.

3. The method for sealing leaking rainwater and sewage well chambers according to claim 1, characterized in that, In step two, the wire mesh is of two different specifications; the denser wire mesh is mainly used to wrap around the leak point, while the less dense wire mesh is mainly used to wrap around the area within 0.5m above and below the leak point; the wire mesh is wrapped around the well chamber structure where the leak point is located at least once and a half times; the two different specifications of wire mesh are 1.66mm and 3mm respectively.

4. The method for sealing leaking rainwater and sewage well chambers according to claim 1, characterized in that, In step two, the PVC pipe is tied to the outside of the wire mesh, and the two are tied together and fixed to the leaking area of ​​the well structure for at least one and a half weeks. After the PVC pipe is tied, more than 2m of pipe is left at both the top and bottom ends. The PVC pipe has pressure relief outlet holes evenly spaced at the part of the pipe in contact with the leak point. The opening size is 5mm-10mm, the outlet holes are spaced 20mm apart, and the openings face the leak point.

5. The method for sealing leaking rainwater and sewage well chambers according to claim 4, characterized in that, The perforated portion of the PVC pipe is wrapped with non-woven geotextile, and the PVC pipe can be corrugated pipe, steel pipe or other flexible material.

6. The method for sealing leaking rainwater and sewage well chambers according to claim 1, characterized in that, In steps four and five, the concrete poured into the steel mold is crack-resistant fiber concrete, and the concrete grade must be equal to or higher than the concrete grade strength of the well structure, and not lower than C30 concrete. After the C30 concrete reaches a certain strength, a two-step waterproofing treatment is performed on the top of the C30 concrete and the upper end of the PVC pipe using an acrylic hydrochloric acid waterproof coating.

7. A sealing device for leaking rainwater and sewage well chambers, implementing the sealing method as described in claim 1, characterized in that, include: Drainage unit, sewage discharge unit, steel membrane, C30 concrete and concrete pump box; The drainage unit includes a wire mesh and a PVC pipe wrapped around the leak point located in the well chamber structure. The wire mesh is tightly wrapped around the leak point above and below, and the PVC pipe is wrapped around the wire mesh to jointly surround the leak point. The sewage discharge unit includes a replacement box connected to the upper end of the PVC pipe, a vacuum pump connected to the replacement box, a temporary plug connected to the lower end of the PVC pipe, and a sewage discharge valve at the bottom of the replacement box.

8. The sealing device for leaking rainwater and sewage well chambers according to claim 7, characterized in that, After the lower end of the PVC pipe is temporarily sealed, the vacuum pump is tested and kept in normal operation. The PVC pipe is kept under negative pressure so that the leaked rainwater and sewage accumulate in the pipe. When a certain amount is reached, the sewage flows into the replacement box and flows out from the drain valve, thus completing the drainage of rainwater and sewage.

9. A sealing device for leaking rainwater and sewage well chambers according to claim 8, characterized in that, When the PVC pipe is under continuous negative pressure, steel molds are set around the well structure and C30 concrete is poured to complete the external sealing.

10. A sealing device for leaking rainwater and sewage well chambers according to claim 9, characterized in that, The temporary seal at the lower end of the PVC pipe is removed after the concrete inside the steel membrane reaches a certain strength. The lower end of the PVC pipe is then connected to the concrete pump box, and the concrete slurry is pumped into the replacement tank using a vacuum pump. The internal pressure relief outlet of the PVC pipe is then sealed.

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