Rain and sewage diversion reconstruction construction method for closed conduit in old urban area

Abstract

The invention discloses a rainwater and sewage diversion reconstruction construction method for an underdrain in an old urban area. The method comprises the following steps: S1, clearing and dredging the underdrain, forming a plurality of operation holes in a road surface at the top of the underdrain, ventilating the interior of the underdrain, and sucking accumulated water in the underdrain; s2, bottom plate construction is conducted, and wood plates are laid at the bottom of the closed conduit to serve as trolley channels; s3, partition wall construction; partition wall construction is conducted in the closed conduit, partition walls are distributed in the length direction of the closed conduit, and the closed conduit is divided into a sewage bin and a rainwater bin; s4, closure at a discharge port; and S5, restoring the closed conduit. The invention provides a rainwater and sewage diversion transformation construction method for an underdrain in an old urban area. The rainwater and sewage diversion transformation construction method is used for performing construction transformation on the underdrain in which rainwater and sewage flow is mixed in the old urban area, removing sludge accumulated throughout the year, repairing the internal structure of the underdrain and realizing rainwater and sewage diversion through a partition wall.

Description

Technical Field

[0001] The present invention relates to the field of construction methods for rainwater and sewage diversion reconstruction of underground canals in old urban areas. More specifically, the present invention relates to a construction method for rainwater and sewage diversion reconstruction of underground canals in old urban areas. Background Art

[0002] Culverts are generally natural rivers that have been artificially covered to form urban roads and combined drainage channels. Culvert sewage interception is to intercept the sewage discharged into the culvert from old urban areas and villages in the city and guide it into the sewage pipe so that it does not merge with rainwater for discharge. Measures are taken to discharge the sewage to the sewage treatment plant for treatment, while the rainwater is discharged into natural water bodies. Most of the old drainage channels in old urban areas and villages in the city are combined rainwater and sewage discharge. Combined culverts are one of the main causes of overflow pollution in water bodies during the rainy season. With the development of my country's urbanization process, combined discharge cannot meet people's pursuit of quality of life and ecological protection. It is urgent to promote the transformation of combined culverts and realize the separation of rainwater and sewage in culverts. Summary of the invention

[0003] In order to achieve these purposes and other advantages according to the present invention, a preferred embodiment of the present invention provides a construction method for rainwater and sewage diversion reconstruction of an old urban area culvert, comprising the following steps: S1. Clearing of culverts Several working holes are opened on the road surface at the top of the culvert to ventilate the culvert and to pump out the accumulated water in the culvert; S2. Bottom plate construction Lay wooden planks at the bottom of the culvert to serve as a passage for bucket trucks; S3, construction of compartment walls; Constructing compartment walls in the culvert, wherein the compartment walls are distributed along the length of the culvert to divide the culvert into a sewage compartment and a rainwater compartment; S4, discharge port cut-off; S5. Culvert restoration.

[0004] Preferably, the S1 specifically comprises the following steps: S11. Open several working holes on the road surface at the top of the culvert, and the area between two adjacent working holes is considered as a construction section; S12. Collect on-site photos of the bottom of the culvert; S13. Use ventilation ducts to mechanically ventilate the culvert, and install gas detectors in the culvert to monitor the air in the culvert in real time; S14. A blocking wall is set upstream of each working hole. The blocking wall is vertically set in the culvert, and the culvert is divided into several dredging sections. The accumulated water in the dredging sections is pumped to the downstream by a water pump, and the silt at the bottom of the culvert is flushed with a high-pressure water gun, and the silt after flushing is sucked away by a sewage suction truck.

[0005] Preferably, in S11, the distance between two adjacent working holes is maintained at 40-50 cm.

[0006] In S13, one end of the ventilation duct passes through the top of the culvert and extends into the culvert, and the other end is connected to the outside, and the ventilation duct is connected to an external fan.

[0007] Preferably, the S2 specifically comprises the following steps: S21. A gravel cushion layer is laid at the bottom of the culvert. The gravel cushion layer is laid in the culvert using a bucket truck and compacted using a flat plate compactor. The laying order is to first lay gravel at the working hole, and then lay wooden boards on the laid gravel cushion layer as a bucket truck passage. S22. After the gravel cushion of a construction section is laid, plain concrete is poured on the gravel cushion as a base plate. The concrete is poured manually with bucket trucks to transport it to the construction area.

[0008] Preferably, S3 specifically includes the following steps: S31. Mark the spacing and position of the steel bars at the bottom of the culvert in advance, and accurately drill holes to implant the vertical and transverse steel bars. The two ends of the transverse steel bars are vertically connected to the vertical steel bars to form a steel bar protective layer, and mortar pads are set at the bottom of the steel bar protective layer; S33, use multi-layer plywood to install the formwork outside the steel bar protection layer; S34, clean up the garbage inside the formwork, and pre-inspect the formwork and steel bars. After acceptance, pour concrete to form concrete compartment walls; S35. Remove the formwork after the concrete strength is sufficient to ensure that its surface and edges will not be damaged by removing the formwork; S36, continue to construct a brick compartment wall on the top of the concrete compartment wall to form a complete compartment wall; S37. Use waterproof mortar to plaster the partition wall, and the mortar thickness should be controlled at 20~25mm.

[0009] Preferably, the S4 specifically includes the following steps: S41. Blocking with a brick wall, burying a sewage pipe at the bottom of the brick wall, and diverting the sewage to the sewage tank through the sewage pipe to intercept the sewage; S42. The side outlet of the rainwater tank uses a sewage pipe to extend through the brick-built compartment wall to connect to the sewage tank. The sewage pipe needs to be hot-melt welded firmly.

[0010] Preferably, the S5 specifically comprises the following steps: S51. Select a restoration method based on the actual situation of the working hole. If the working hole is caused by the removal of the prefabricated slab, the road surface needs to be restored with a cast-in-place cover plate after the construction in the culvert is completed; if the working hole is formed after the cement road surface is damaged by the excavator, the inspection port here needs to be restored to its original state, and the process is to cast the cover plate in place and reserve the manhole cover hole, lay bricks and install the manhole cover, backfill with original soil, backfill with sand, and restore the concrete road surface; S52. Manhole covers are used in sewage tanks and rainwater tanks, both of which are made of ductile iron. If the working hole is caused by the dismantling of the original prefabricated panels, the manhole cover hole should be reserved when the steel bars are tied to the prefabricated cover plates, and the manhole cover should be installed when pouring concrete. If the working hole is formed by an excavator damaging the cement pavement, the manhole cover should be installed after the wellbore is raised.

[0011] The present invention includes at least the following beneficial effects: This method opens a construction operation hole at a certain distance on the top of the existing culvert, sets a blocking wall and a temporary diversion pipe inside the culvert, conducts sewage drainage, and forms a temporary operation section. The culvert is dredged in sections by flushing with a high-pressure water gun, dredging with a suction truck, and manual dredging. After the dredging is completed, a crushed stone cushion layer is laid on the bottom plate of the culvert and bottom sealing concrete is poured. A compartment wall is built on the upper part of the bottom plate to divide the culvert into a sewage compartment and a rainwater compartment. The sewage outlet along the culvert is connected to the sewage compartment, and the rainwater outlet is connected to the rainwater compartment to achieve rainwater and sewage diversion.

[0012] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a top view of the culvert of the present invention; Figure 2 It is a construction schematic diagram of underground channel ventilation, pipeline robot detection and gas detection in the present invention; Figure 3 It is a construction schematic diagram of underground canal pumping and dredging in the present invention; Figure 4 is a cross-sectional view of the culvert of the present invention; Figure 5 It is a cross-sectional view of the compartment wall in the present invention.

[0014] 1-top road surface of culvert, 2-operation hole, 3-construction section, 4-pipeline robot, 5-culvert bottom, 6-ventilation duct, 7-gas detector, 8-sealing wall, 9-water pump, 10-high-pressure water gun, 11-sewage suction truck, 12-gravel cushion, 13-bottom plate, 14-compartment wall, 15-vertical steel bars, 16-horizontal steel bars, 17-mortar pads, 18-concrete compartment wall, 19-brick compartment wall, 20-waterproof mortar, 21-culvert outlet, 22-brick wall, 23-sewage pipe, 24-sewage tank, 25-rainwater tank. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0016] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0017] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0018] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0019] like Figure 1 As shown, a preferred embodiment of the present invention provides a construction method for rainwater and sewage diversion reconstruction of an old city culvert, comprising the following steps: S1. Clearing of culverts A number of operation holes 2 are opened on the road surface 1 at the top of the culvert to ventilate the culvert and to pump out the accumulated water in the culvert; The S1 specifically comprises the following steps: S11. A plurality of working holes 2 are opened on the road surface 1 at the top of the culvert, and the space between two adjacent working holes 2 is regarded as a construction section 3; the distance between two adjacent working holes is maintained at 40-50 cm.

[0020] S12, using the pipeline robot 4 to collect on-site photos of the bottom 5 of the culvert; S13. Use the ventilation duct 6 to mechanically ventilate the culvert, and install a gas detector 7 in the culvert to monitor the air in the culvert in real time; one end of the ventilation duct 6 passes through the top of the culvert and extends into the culvert, and the other end is connected to the outside, and the ventilation duct 6 is connected to an external fan.

[0021] S14. A blocking wall 8 is set upstream of each working hole 2. The blocking wall 8 is vertically set in the culvert to divide the culvert into several desilting sections. The accumulated water in the desilting sections is pumped to the downstream by a water pump 9. The silt at the bottom of the culvert is flushed with a high-pressure water gun 10, and the silt after flushing is sucked away by a sewage suction truck 11.

[0022] S2. Bottom plate construction Lay wooden planks at the bottom of the culvert to serve as a passage for bucket trucks; The S2 specifically comprises the following steps: S21, laying a gravel cushion layer 12 at the bottom of the culvert, the gravel cushion layer 12 is laid in the culvert by a bucket truck, and compacted by a flat plate compactor, and the laying order is to first lay gravel at the working hole, and then lay wooden boards on the laid gravel cushion layer as a bucket truck passage; S22. After the gravel cushion of a construction section is paved, 10-12 cm of plain concrete is poured on the gravel cushion as a bottom plate 13. The concrete is poured manually with a bucket truck to transport it to the construction area.

[0023] S3, construction of compartment walls; Constructing compartment walls in the culvert, wherein the compartment walls are distributed along the length of the culvert to divide the culvert into a sewage compartment and a rainwater compartment; S3 specifically includes the following steps: S31, marking the spacing and position of the steel bars at the bottom of the culvert in advance, and accurately drilling holes to implant the vertical steel bars 15 and the transverse steel bars 16, the two ends of the transverse steel bars 16 are vertically connected to the vertical steel bars 15 to form a steel bar protection layer, and a mortar pad 17 is set at the bottom of the steel bar protection layer; S33, use multi-layer plywood to install the formwork outside the steel bar protection layer; S34, cleaning the garbage inside the template, and pre-inspecting the template and steel bars, and after acceptance, pouring concrete to form the concrete compartment wall 18; S35. Remove the formwork after the concrete strength is sufficient to ensure that its surface and edges will not be damaged by removing the formwork; S36, continue to construct the brick compartment wall 19 on the top of the concrete compartment wall 18 to form a complete compartment wall 14; S37. Use waterproof mortar 20 to plaster the partition wall 14, and the mortar thickness is controlled at 20~25mm.

[0024] S4, discharge port cut-off; The S4 specifically includes the following steps: S41, using a brick wall 22 to block, burying a sewage pipe at the bottom of the brick wall, and diverting the sewage to the sewage tank through the sewage pipe to achieve sewage interception; S42. The side outlet of the rainwater tank 25 uses a sewage pipe 23 to extend through the brick-built compartment wall to connect to the sewage tank 24. The sewage pipe needs to be hot-melt welded firmly.

[0025] S5. Culvert restoration.

[0026] The S5 specifically comprises the following steps: S51. Select a restoration method based on the actual situation of the working hole. If the working hole is caused by the removal of the prefabricated slab, the road surface needs to be restored with a cast-in-place cover plate after the construction in the culvert is completed; if the working hole is formed after the cement road surface is damaged by the excavator, the inspection port here needs to be restored to its original state, and the process is to cast the cover plate in place and reserve the manhole cover hole, lay bricks and install the manhole cover, backfill with original soil, backfill with sand, and restore the concrete road surface; S52. Manhole covers are used in sewage tanks and rainwater tanks, both of which are made of ductile iron. If the working hole is caused by the dismantling of the original prefabricated panels, the manhole cover hole should be reserved when the steel bars are tied to the prefabricated cover plates, and the manhole cover should be installed when pouring concrete. If the working hole is formed by an excavator damaging the cement pavement, the manhole cover should be installed after the wellbore is raised.

[0027] Example 1 A certain engineering project in Jingzhou City included a culvert sewage interception project. The culvert was renovated using the culvert rainwater and sewage diversion renovation construction method, which included culvert dredging, bottom plate construction, compartment wall construction, outlet interception, and culvert restoration.

[0028] Culvert dredging includes the following steps: Step 1: According to the construction environment conditions around the culvert, select a suitable location to open an operation hole. The distance between the operation holes is controlled at about 40m for subsequent ventilation, dredging and culvert repair operations. Every two adjacent operation holes are a construction section. After each construction section is determined, the dredging work is carried out from upstream to downstream; Step 2: Before dredging the culvert, use the CCTV pipeline robot to survey the interior of the culvert, and the instrument operator focuses on observation and recording based on the collected image data; Step 3: Use mechanical ventilation. The length of the ventilation duct should ensure that fresh air can be delivered to the inside of the culvert. Step 4: Construction of blocking walls and diversion pipes. The blocking walls are set upstream of each working port. After the blocking walls are completed, the accumulated water in the dredging section is pumped to the downstream using a water pump; Step 5: Use manual labor combined with a sewage pump and a high-pressure water gun to clear the dredging. Because the culvert contains a large amount of garbage, in order to ensure the quality and efficiency of the dredging, manual labor is required to enter the culvert in advance to clean up the garbage.

[0029] The base plate construction includes the following steps: Step 1: For the section without bottom plate, a 8cm graded gravel cushion layer is laid. The gravel cushion layer is laid in the culvert by a bucket truck and compacted by a 2.2KW flat plate compactor. The laying order is to lay the gravel at the opening first, and then lay wooden boards on the laid gravel cushion layer as the bucket truck channel; Step 2: After the gravel cushion layer of a construction section is laid, pour 10cm C25 plain concrete on the cushion layer as the base plate. The concrete is poured manually and transported to the construction area by bucket trucks.

[0030] The construction of the compartment wall includes the following steps: Step 1: The construction sequence of the compartment wall is: bottom plate embedding → side wall reinforcement binding → formwork installation → concrete pouring → formwork removal → brick wall construction → mortar finishing.

[0031] Step 2: When tying the reinforcement of the compartment wall, the spacing and position of the reinforcement should be marked on the foundation of the culvert in advance, and the reinforcement should be accurately drilled and implanted. The reinforcement protection layer is provided with mortar pads with a specification of 50×50×50mm, a spacing of 1m, and a plum blossom shape.

[0032] Step 3: Set a construction settlement joint every 20~25m on the concrete compartment wall of the culvert.

[0033] Step 4: Concrete is transported by ground pump or manual handling. Before pouring concrete, clean up all garbage inside the formwork, and pre-inspect the formwork and steel bars. Concrete pouring can only be carried out after acceptance.

[0034] Step 5: After the lower part of the compartment wall is poured, the remaining compartment wall is constructed with brickwork. The brickwork part is constructed with MU20 sintered ordinary bricks and M10 cement mortar. Every 5 bricks are equipped with 2C6 full-length tie bars, which are set from the second brick at the bottom and also under the second brick at the top of the wall.

[0035] Step 6: After the brick wall construction is completed, use waterproof mortar to plaster the partition wall. The plaster mortar uses M10 waterproof mortar, and the mortar thickness is controlled at 20mm.

[0036] The discharge cut-off includes the following steps: Step 1: The culvert outlet 21 can be roughly divided into the original simple outlet and the self-made outlet of the residents. The original simple outlet is mostly a brick culvert with a large sewage flow. This type of outlet is first blocked with a brick wall, and a PE pipe is buried at the bottom of the brick wall. The PE pipe is used to divert the sewage to the sewage tank to intercept the sewage; Step 2: The rainwater tank side outlet is uniformly extended with PE pipes through the brick partition wall to connect to the sewage tank. The PE pipes need to be hot-melt welded firmly. During the welding construction process, debris around the pipes needs to be removed to create a good working environment. The PE pipe connection port is fully scraped and the port is chamfered.

[0037] Underdrain restoration involves the following steps: Step 1: After the internal construction of the culvert is completed, the culvert cover must be restored in time for the working hole. Each working opening is equipped with a rainwater well inspection port or a sewage well inspection port, and the rainwater well inspection ports and sewage well inspection ports are arranged at staggered intervals.

[0038] Step 2: Choose the appropriate restoration method according to the actual situation of the operation opening. If the operation opening is caused by the removal of the original prefabricated board, the road surface needs to be restored with a cast-in-place cover after the construction in the culvert is completed; if the operation opening is formed after the cement road surface is damaged by the excavator, the inspection opening here needs to be restored to its original state. The process is to cast the cover and reserve the manhole cover hole, raise the wellbore (brickwork) and install the manhole cover, backfill with original soil, backfill with sand, and restore the concrete road surface.

[0039] Step 3: Use 400 manhole covers for sewage tanks and 700 manhole covers for rainwater tanks, both of which are made of ductile iron, grade D400. If the working opening is caused by the removal of the original prefabricated plate, reserve the manhole cover hole when tying the steel bars of the prefabricated cover plate, and install the manhole cover when pouring concrete; if the working opening is formed by the excavator destroying the cement pavement, install the manhole cover after the wellbore is lifted.

[0040] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A construction method for rainwater and sewage diversion reconstruction in old urban areas, characterized in that: The following steps are involved: S1. Clearing of culverts Several working holes are opened on the road surface at the top of the culvert to ventilate the culvert and to pump out the accumulated water in the culvert; S2. Bottom plate construction Lay wooden planks at the bottom of the culvert to serve as a passage for bucket trucks; S3, construction of compartment walls; Constructing compartment walls in the culvert, wherein the compartment walls are distributed along the length of the culvert to divide the culvert into a sewage compartment and a rainwater compartment; S4, discharge port cut-off; S5. Culvert restoration.

2. The construction method for rainwater and sewage diversion reconstruction in the old city culvert according to claim 1 is characterized in that: The S1 specifically comprises the following steps: S11. Open several working holes on the road surface at the top of the culvert, and the area between two adjacent working holes is considered as a construction section; S12. Collect on-site photos of the bottom of the culvert; S13. Use ventilation ducts to mechanically ventilate the culvert, and install gas detectors in the culvert to monitor the air in the culvert in real time; S14. A blocking wall is set upstream of each working hole. The blocking wall is vertically set in the culvert, and the culvert is divided into several dredging sections. The accumulated water in the dredging sections is pumped to the downstream by a water pump, and the silt at the bottom of the culvert is flushed with a high-pressure water gun, and the silt after flushing is sucked away by a sewage suction truck.

3. The construction method for rainwater and sewage diversion reconstruction in the old city culvert according to claim 2 is characterized in that: In S11, the distance between two adjacent working holes was maintained at 40-50 cm; In S13, one end of the ventilation duct passes through the top of the culvert and extends into the culvert, and the other end is connected to the outside, and the ventilation duct is connected to an external fan.

4. The construction method for rainwater and sewage diversion reconstruction in the old city culvert according to claim 2 is characterized in that: The S2 specifically comprises the following steps: S21. A gravel cushion layer is laid at the bottom of the culvert. The gravel cushion layer is laid in the culvert using a bucket truck and compacted using a flat plate compactor. The laying order is to first lay gravel at the working hole, and then lay wooden boards on the laid gravel cushion layer as a bucket truck passage. S22. After the gravel cushion of a construction section is laid, plain concrete is poured on the gravel cushion as a base plate. The concrete is poured manually with bucket trucks to transport it to the construction area.

5. The construction method for rainwater and sewage diversion reconstruction in the old city culvert according to claim 1 is characterized in that: S3 specifically includes the following steps: S31. Mark the spacing and position of the steel bars at the bottom of the culvert in advance, and accurately drill holes to implant the vertical and transverse steel bars. The two ends of the transverse steel bars are vertically connected to the vertical steel bars to form a steel bar protective layer, and mortar pads are set at the bottom of the steel bar protective layer; S33, use multi-layer plywood to install the formwork outside the steel bar protection layer; S34, clean up the garbage inside the formwork, and pre-inspect the formwork and steel bars. After acceptance, pour concrete to form concrete compartment walls; S35. Remove the formwork after the concrete strength is sufficient to ensure that its surface and edges will not be damaged by removing the formwork; S36, continue to construct a brick compartment wall on the top of the concrete compartment wall to form a complete compartment wall; S37. Use waterproof mortar to plaster the partition wall, and the mortar thickness should be controlled at 20~25mm.

6. The construction method for rainwater and sewage diversion reconstruction in the old city culvert according to claim 1 is characterized in that: The S4 specifically includes the following steps: S41. Blocking with a brick wall, burying a sewage pipe at the bottom of the brick wall, and diverting the sewage to the sewage tank through the sewage pipe to intercept the sewage; S42: The side outlet of the rainwater tank is connected to the sewage tank by extending the sewage pipe through the brick compartment wall.

7. The construction method for rainwater and sewage diversion reconstruction in the old city culvert according to claim 1 is characterized in that: The S5 specifically comprises the following steps: S51. Select a restoration method based on the actual situation of the working hole. If the working hole is caused by the removal of the prefabricated slab, the road surface needs to be restored with a cast-in-place cover plate after the construction in the culvert is completed; if the working hole is formed after the cement road surface is damaged by the excavator, the inspection port here needs to be restored to its original state, and the process is to cast the cover plate in place and reserve the manhole cover hole, lay bricks and install the manhole cover, backfill with original soil, backfill with sand, and restore the concrete road surface; S52. Manhole covers are used in sewage tanks and rainwater tanks, both of which are made of ductile iron. If the working hole is caused by the dismantling of the original prefabricated panels, the manhole cover hole should be reserved when the steel bars are tied to the prefabricated cover plates, and the manhole cover should be installed when pouring concrete. If the working hole is formed by an excavator damaging the cement pavement, the manhole cover should be installed after the wellbore is raised.

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