CN111456091B - Pressure sewage pipe diversion method - Google Patents

Pressure sewage pipe diversion method Download PDF

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Publication number
CN111456091B
CN111456091B CN202010301648.8A CN202010301648A CN111456091B CN 111456091 B CN111456091 B CN 111456091B CN 202010301648 A CN202010301648 A CN 202010301648A CN 111456091 B CN111456091 B CN 111456091B
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China
Prior art keywords
inspection well
pipe
sewage pipe
pressure sewage
well
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CN111456091A (en
Inventor
祝兰兰
李华
周莳备
范斌华
彭宪辉
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Shanghai Pudong New Area Construction Group Co ltd
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Shanghai Pudong New Area Construction Group Co ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/12Manhole shafts; Other inspection or access chambers; Accessories therefor
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12Consolidating by placing solidifying or pore-filling substances in the soil
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F3/00Sewer pipe-line systems
    • E03F3/06Methods of, or installations for, laying sewer pipes

Abstract

The invention relates to a pressure sewage pipe diversion method, which belongs to the technical field of municipal engineering and comprises the following steps: s1: positioning the inspection well; s2: enclosing; s3: a bored pile is arranged at the bottom of the inspection well; s4: carrying out double-liquid layered grouting reinforcement on the bottom of the inspection well; s5: excavating a foundation pit of the inspection well, and binding a main reinforcement at the top of the cast-in-situ bored pile and an inspection well bottom plate reinforcement together; s6: binding, formwork erecting and pouring the whole inspection well; s7: laying a new pressure sewage pipe; s8: cutting off the original pressure sewage pipe, plugging the original pressure sewage pipe, pumping water and pumping air to the inspection well, disassembling the plug after the processing is finished, installing a joint pipe and a bent pipe, and finally sealing the cover. The invention has the effects of high construction stability and low danger coefficient.

Description

Pressure sewage pipe diversion method
Technical Field
The invention relates to the technical field of municipal engineering, in particular to a pressure sewage pipe diversion method.
Background
At present, a plurality of pipelines are arranged in cities to discharge sewage generated in life of people and rain water which falls at ordinary times. In order to meet urban planning and drainage requirements, an existing sewage discharge route of a certain section is occasionally rerouted, and sewage discharged from an existing pipeline is led into a new pipe network and discharged along different routes.
The Chinese invention patent application with the application number of CN201910087767.5 discloses a construction method for changing the way of a sewage well and a pressure sewage pipe network, wherein the construction method comprises the steps of firstly laying a new pipeline at an old pipeline; then building a well body of the sewage well by using concrete and bricks; then cutting off and taking out the old pipeline in the well body; finally, burying the new pipeline and covering the well cover.
One pressure sewage pipe is often used for more than ten years or even decades, when the pressure sewage pipe is re-routed, if the re-routing construction method is also used, the well body of the sewage well is built only through concrete and bricks, and the pressure sewage pipe and soil around the sewage well are not treated, so that the well body is inclined or even deformed in the construction process, and the construction risk is improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a pressure sewage pipe diversion method.
The above object of the present invention is achieved by the following technical solutions:
a pressure sewer pipe diversion method comprises the following operation steps:
s1: positioning an inspection well, performing pavement breaking and old material cleaning after the positioning is finished, and excavating earthwork at the top of an original pressure sewage pipe after the cleaning is finished;
s2: an SMW method is used for enclosing the inspection well;
s3: arranging a plurality of cast-in-situ bored piles at the bottom of the inspection well, and maintaining the cast-in-situ bored piles for 25-35 days;
s4: reinforcing and maintaining soil mass 3-4m below the bottom of the inspection well for 7-10 days by adopting double-liquid layered grouting;
s5: excavating a foundation pit of the inspection well, crushing the top of the bored pile and chiseling out the main reinforcement after earthwork of the foundation pit is cleaned, and fixedly connecting the main reinforcement and the reinforcement of the inspection well bottom plate when the reinforcement of the inspection well bottom plate is bound;
s6: binding reinforcing steel bars of an inspection well bottom plate, erecting and pouring a formwork, then binding reinforcing steel bars of an inspection well wall body, erecting the inspection well wall body and a top plate formwork, binding reinforcing steel bars of a top plate, installing embedded parts of the top plate, and pouring concrete of the inspection well wall body and the top plate;
s7: excavating the new pressure sewage pipe pipeline, laying a new pressure sewage pipe in the pipeline, backfilling the pipeline after laying, and repairing the road;
s8: cutting off a pipe body of an original pressure sewage pipe in a pressure well, taking out cut residues, plugging pipe orifices on two sides of a cut by using plugging plugs in the cutting process, pumping and discharging waste water and waste gas in the inspection well after plugging is finished, installing a joint pipe and a bent pipe after pumping and discharging is finished, and finally stopping water at the joint and covering an inspection well cover.
By adopting the technical scheme, the inspection well is surrounded by the SMW method, so that the influence on the environment around the inspection well is small, and the vibration of the original pressure sewage pipe is reduced; the manhole bottom plate is firmer by arranging the bored pile and binding the bored pile with the steel bars of the manhole bottom plate, and the bored pile can reduce the settlement of the constructed manhole and improve the setting stability of the manhole; the double-liquid layered grouting is adopted for the soil mass 3-4m below the bottom of the inspection well, so that the aim of reinforcing the soil mass is fulfilled, the inspection well has a stable foundation, the stability of the inspection well is further improved, the well body of the inspection well is prevented from being inclined or even deformed in the construction process, and the risk in the construction process is reduced.
The present invention in a preferred example may be further configured to: the S4 specifically includes: reinforcing and maintaining soil mass 3-4m below the bottom of the inspection well for 7-10 days by adopting double-liquid layered grouting; and compacting, grouting and reinforcing the soil body with the thickness of 3-4m at the bottom of the original pressure sewage pipe, and maintaining for 7-10 days, wherein the grouting pipe is driven in a mode that: grouting pipes are obliquely inserted into soil body below the bottom plate at an angle of 45-60 degrees from the edges of the two sides of the bottom plate.
Through adopting above-mentioned technical scheme, carry out compaction slip casting to the soil body of former pressure sewage pipe bottom and consolidate, prevent to the later stage in the process of original pressure sewage pipe excision, because the soil body fastening nature is not strong and cause the influence to the excision process, guaranteed construction quality.
The present invention in a preferred example may be further configured to: and S1, after earthwork at the top of the original pressure sewage pipe is removed, finely adjusting the position of the inspection well, and arranging a section of original pressure sewage pipe in the proposed inspection well.
Through adopting above-mentioned technical scheme, accomplish former pressure sewage pipe and clear up, need adjust the position of inspection shaft, make the tube coupling of a completion in the former pressure sewage pipe be located the inspection shaft of proposing to build, the later stage diver when abolishing the pipeline under water, with this whole root pipeline abolish can, reduce work load under water, simultaneously, can take better protection to sewage pressure pipe.
The present invention in a preferred example may be further configured to: the SMW construction method in the S2 comprises the following construction steps: step a 1: measuring and paying off, and excavating a guide channel; step a 2: paving guide positioning section steel on two sides of the guide channel, and marking a drilling position and a position for inserting H-shaped steel on the guide positioning section steel; step a 3: injecting cement slurry into the drilling screw rod in the ascending and descending processes, and stirring cement soil in the hole by adopting high-pressure air injection; step a 4: before the cement soil in the drill hole is condensed and hardened, the H-shaped steel is hoisted and inserted into the drill hole.
By adopting the technical scheme, the SMW construction method is adopted, the influence on the environment around the inspection well is small, and for the old pressure sewage pipe used for decades or even decades, if steel sheet piles are directly adopted for enclosing, the vibration is large during construction, the influence on the old pressure sewage pipe is large, and the influence on the pipe body of the pressure sewage pipe can be reduced by utilizing the SMW construction method.
The present invention in a preferred example may be further configured to: the construction steps of the cast-in-situ bored pile in the step S3 are as follows: step b 1: positioning the drilled hole, and marking the position of the cast-in-situ bored pile; step b 2: drilling holes by using a drilling machine, wherein the drilling mode is selected to carry out interval jumping construction; step b 3: injecting cleaned slurry into the hole, and replacing the slurry containing suspended drilling slag in the hole; step b 4: descending a reinforcement cage into the hole, and then descending a guide pipe, wherein the reinforcement cage is positioned inside the guide pipe; step b 5: injecting concrete into the guide pipe; step b6: the guide tube is taken out of the hole by using a crane.
By adopting the technical scheme, the bored pile adopts mechanical operation in the construction process, the construction is simple and convenient, and the reinforcement cage and the concrete can be processed and distributed in a centralized way and can also be processed on site, so that the operation is convenient; meanwhile, the construction speed is high, the process is mature, safety and reliability are realized, and the settlement of the constructed inspection well is reduced.
The present invention in a preferred example may be further configured to: and in the process of excavating the foundation pit of the inspection well in the S5, when the excavator excavates the pit bottom to 20-50mm, manually cleaning the earthwork at the lower part of the excavator.
By adopting the technical scheme, in the excavation process of the foundation pit of the inspection well, the excavator is used for excavation at the earlier stage, the excavation efficiency is ensured, when the excavator excavates to the bottom of the pit by 20-50mm, manual cleaning is used instead, the excavator is prevented from colliding with an original pressure sewage pipe to cause damage of the sewage pipe, and the normal operation of construction is favorably ensured.
The present invention in a preferred example may be further configured to: and S6, after the bottom plate, the wall body and the top plate are poured, reinforcing steel bar concrete is wrapped and fixed on a section of original pressure sewage pipe, close to the inspection well, on the outer side of the inspection well.
By adopting the technical scheme, the reinforced concrete is wrapped and fixed on the original pressure sewage pipe which is close to the inspection well and outside the inspection well, so that the firmness of the sewage pipe is improved, and when a diver breaks the pipeline in the inspection well in the later period, the damage to the adjacent pipeline is avoided.
The present invention in a preferred example may be further configured to: and in the S8, when the waste water and the waste gas are pumped and discharged, the toxic and harmful gas is detected before the well is lowered, and the inspection is carried out once every 1-2 h.
By adopting the technical scheme, the gas in the inspection well is detected, and the gas in the inspection well can enter the inspection well for construction after reaching the standard, so that the safety in the construction process is ensured.
In summary, the invention includes at least one of the following beneficial technical effects:
1. an SMW construction method is used for enclosing the inspection well, so that the influence on the environment around the inspection well is small, and the vibration of the original pressure sewage pipe is reduced; the manhole bottom plate is firmer by arranging the bored pile and binding the bored pile with the steel bars of the manhole bottom plate, and the bored pile can reduce the settlement of the constructed manhole and improve the setting stability of the manhole; double-liquid layered grouting is adopted for a soil body 3-4m below the bottom of the inspection well, so that the aim of reinforcing the soil body is fulfilled, the inspection well has a stable foundation, the stability of the inspection well is further improved, the well body of the inspection well is prevented from inclining or even deforming in the construction process, and the safety in the construction process is ensured;
2. the soil body at the bottom of the original pressure sewage pipe is compacted and grouted for reinforcement, so that the influence on the cutting process due to poor tightness of the soil body in the later cutting process of the original pressure sewage pipe is prevented, and the construction quality is ensured;
3. the reinforced concrete is wrapped and fixed on a section of original pressure sewage pipe on the outer side of the inspection well, which is close to the inspection well, so that the firmness of the sewage pipe is improved, and when a diver breaks the pipeline in the inspection well in the later period, the damage to the adjacent pipeline is avoided.
Detailed Description
The present invention will be described in further detail below.
The invention discloses a pressure sewage pipe diversion method, comprising the following steps of S1: firstly, according to the preliminarily determined position of the inspection well, the road surface is broken by using a hydraulic pick head machine, and before breaking, a cutting machine is used for cutting a seam, so that the influence on surrounding plates can be reduced as much as possible. After the road surface is broken and the old materials are cleared, a sample groove is excavated manually, whether other pipelines which are not clear exist is determined, if pipelines which can be moved exist, the position of the inspection well can be properly adjusted to avoid. After the pipeline is avoided, the earthwork at the top of the original pressure sewage pipe is excavated manually, the top of the original pressure sewage pipe is exposed, the position and the structure of the pipe joint of the original pressure sewage pipe are determined, meanwhile, the position of the inspection well is properly adjusted, and one pipeline is arranged in the inspection well to be built. Like this, later on when the diver breaks away the pipeline under water, with this whole root pipeline break away can, reduce underwater work load, simultaneously, can get better protection to the sewage pressure pipe.
S2: and (4) enclosing the kiln well by using an SMW construction method. The SMW construction method comprises the following specific construction steps: step a 1: and measuring and paying off, excavating a guide channel, placing the axis of the enclosure structure on a construction site, and excavating a construction groove by adopting an excavator. Step a 2: the method comprises the steps of paving guiding and positioning section steel on two sides of an excavated working groove, marking a drilling position and a position for inserting H-shaped steel on the guiding and positioning section steel according to design requirements, strictly controlling the movement of a pile frame of a drilling machine according to the determined position by an operator, ensuring that the axis of a drilled hole is not deviated in position, controlling the drilling depth of the drilled hole to reach the standard, marking a scale line of the drilling depth on a drill pipe by utilizing the relative dislocation principle of a drill rod and the pile frame, and strictly controlling the drilling speed and the lifting speed and the drilling depth. The mechanical equipment moves along the axis of the foundation pit enclosure, and the pile frame lateral force can be prevented from deviating by adopting the method of the construction sequence schematic diagram to sleeve the drill. And circulating in sequence until the enclosure wall is formed. Step a 3: according to the depth marked by design, the drilling machine keeps the screw rod to rotate at a constant speed, drills down at a constant speed and lifts at a constant speed in the whole process of drilling and lifting, cement slurry with different mixing amounts is injected according to two different speeds of drilling and lifting, high-pressure air injection is adopted to stir cement soil in the hole, the cement slurry is stirred and injected repeatedly at the bottom of the pile, the whole pile is fully and uniformly stirred, and the quality of the stirred pile is ensured. Step a 4: after the cement soil in the drill hole is fully stirred uniformly and before the initial setting and hardening are started, the H-shaped steel with the fixed size is hoisted by a large hoisting machine and inserted into the drill hole, the H-shaped steel is inserted to the designed specified depth by the dead weight of the H-shaped steel, and then the hooking method is changed to separate the H-shaped steel from the lifting hook to wait for the cement soil to be solidified.
S3: and a plurality of cast-in-situ bored piles are arranged at the bottom of the inspection well. The construction steps of the cast-in-situ bored pile are as follows: step b 1: and (3) digging soil in the foundation pit to 0.6-1m, positioning the cast-in-situ bored pile according to a drawing, and marking the position of the cast-in-situ bored pile after positioning. Step b 2: the drilling and pouring pile machine enters the field and is in place on site, and meanwhile, the construction sequence is determined. The gap between adjacent cast-in-situ bored piles is 100-200mm, and the phenomena of collapse, perforation and the like are likely to occur in the sequential construction, so that the cast-in-situ bored piles need to be subjected to alternate jumping construction. Step b 3: setting a mud pool, and adjusting the optimal mud ratio according to the soil quality, wherein the mud proportion is controlled to be 1.15-1.2, the colloid rate is not less than 95%, and the sand content is not more than 4%. Preferably, the bored concrete pile concrete is commercial concrete of underwater C30. And injecting the cleaned slurry into the drill hole, and replacing the slurry containing the suspended drilling slag in the hole. Step b 4: descending a reinforcement cage into the borehole, and then descending a guide pipe, wherein the reinforcement cage is positioned inside the guide pipe; step b 5: injecting concrete into the phase guide pipe; and b6, after the concrete is solidified in the guide pipe, taking the guide pipe out of the hole by using a crane, and curing the cast-in-situ bored pile for 25-35 days.
S4: foundation pit excavation and pressure well construction. Before the foundation pit is excavated, reinforcing the soil mass 3-4m below the bottom of the foundation pit by adopting double-liquid layered grouting and maintaining the soil mass for 7-10 days. Compacting and grouting soil with the thickness of 3-4m at the lower part of the bottom plate of the original pressure sewage pipe, wherein the grouting pipe is driven in the following mode: and (3) obliquely inserting grouting pipes into soil body below the bottom plate from the edges of the two sides of the bottom plate at an angle of 60 degrees, and maintaining the grouting pipes for 7-10 days.
S5: and after the maintenance is finished, starting excavation of the foundation pit, excavating the foundation pit by adopting a back-hoe excavator, and transporting all excavated earthwork outwards. When the excavator digs the earthwork 200mm above the bottom of the pit, the lower earthwork is manually cleaned to prevent the excavator from colliding the original pressure sewage pipe to cause the damage of the sewage pipe. And after the earthwork of the foundation pit is cleaned, breaking the lower bored pile of the inspection well by using an air compressor, chiseling out the main reinforcement of the bored pile, and anchoring the reinforcement in the bottom plate when the reinforcement of the bottom plate of the inspection well is bound. When the pile is drilled, an integral pile body with the height of 50-60mm needs to be reserved in the bottom plate.
S6: binding reinforcing steel bars of a bottom plate of the inspection well, supporting a formwork, pouring concrete, preferably, selecting C30 impervious P6 concrete as the concrete, and then binding reinforcing steel bars of a wall body, supporting the wall body and a top plate formwork. And binding top plate steel bars, installing pressure well cover plate embedded parts, and pouring wall body and top plate concrete. After the inspection well is finished, a brick-laid runner is additionally arranged at the bottom of the inspection well, and reinforced concrete is wrapped and fixed on each section of pipeline on the outer side of the inspection well, so that when a diver breaks the pipeline in the inspection well, the damage to the adjacent pipeline is avoided.
S7: and excavating the new pressure sewage pipe pipeline, wherein a plurality of excavators are mutually matched for excavating the groove, the elevation of the bottom of the groove is strictly controlled by mechanical excavation, and a soil layer with the thickness of 0.15-0.3 m is reserved at the bottom of the groove in order to ensure that the foundation soil is not disturbed and the phenomena of overexcavation and the like are avoided, and manual bottom cleaning is adopted. When the trench excavation depth reaches about 1.0-1.5 m, a first steel pipe support is used at a position 0.5-0.8 m away from the ground, and a second steel support is installed when the trench excavation depth reaches 0.5m above the top of the new pressure sewage pipe, so that the trench excavation and support can be carried out along with excavation. The support adopts a steel pipe loose joint, and the steel pipe support is vertical and tight to the steel sheet pile retaining wall.
After the new pressure sewage pipe pipeline is excavated, foundation laying is conducted on the bottom of the new pressure sewage pipe pipeline, before pipeline foundation laying is conducted, firstly, the height of the bottom of the pipeline and the center line of the pipeline are rechecked, one sample pile is driven at intervals of 3m at the position of the pipeline, and the height of the sample pile is measured by a leveling instrument so as to control the elevation of the foundation surface. The bottom of the trench is manually leveled to remove silt, broken soil and other impurities. And paving, flattening and tamping in a full room according to the specified width of the groove and the thickness requirement of the pipeline foundation.
Before laying the new pressure sewage pipe, the elevation and the central line of the foundation must be rechecked. Impurities such as stones, sludge and the like on the surface of the pipeline foundation need to be cleaned. Before the new pressure sewage pipe joint is arranged in the groove, sundries such as dust, sand, dust, cement and the like on the inner side of the bell mouth and the outer side of the spigot of the new pressure sewage pipe are cleaned to prevent the new pressure sewage pipe from being spliced in place. The bellmouth and the spigot are cleaned by the cloth strips, and then the inner wall of the bellmouth is uniformly coated with lubricant such as liquid vaseline and the like to reduce friction and protect the rubber water stop ring from being damaged.
And the new pressure sewage pipe is in place, the excavator is used for sequentially moving the new pressure sewage pipe joints forwards until the spigots are inserted into the sockets, so that the two pipe joints are connected completely, and the spliced part is sealed by a water stop belt, so that the sealing performance of the new pressure sewage pipe is ensured. After the new pressure sewage pipe is in place, steel cross beams are additionally arranged at two ends of the pipe joint, and the steel wire rope and the hand-operated block are used for slowly pulling to enable the socket to be slowly inserted into the socket so as to ensure that the flexible interface does not leak. And backfilling the ditch after the new pressure sewage pipe is laid, and repairing the road.
S8: increase pressure through other pump stations along separate routes of upper reaches, carry out pre-extraction to the sewage in the former pressure sewage pipe, send water cooperation to make the sewage in the original state sewage pressure pipeline down the well by the full-time diver under the circumstances that rivers are stable to keep carrying out the operation, accomplish former pressure sewage pipe cutting, chisel and remove work to thoroughly clear out the surface of water with all construction residues, and outward transport. The old pipeline abandonment section outside the pressure well keeps 1 section of pipe and is convenient for the shutoff, and the shutoff adopts the shutoff scheme of brick strenghthened type, respectively adopts twice shutoff at the operation face both ends in the cutting process, seals between the two and blocks with C30 concrete packing, reduces the pump drainage time of waste water waste gas in the original pipeline. Preferably, the plugging plug is an inflatable air bag. And after plugging is finished, carrying out waste water and waste gas pumping drainage on the construction operation surface range. An H2SO tester is arranged in the pumping and exhausting process, and the toxic and harmful gas is detected before the well is lowered, and the gas is rechecked every 1-2 hours. The joint pipe and the elbow pipe are subjected to factory-defined machining in advance according to the position and the angle of the excavated actual pipeline, and are subjected to pre-installation drilling. Preferably, the joint pipe is made of reinforced concrete, and the elbow pipe is made of ductile cast iron. The joint pipe is connected with the original pressure sewage pipe in a socket joint mode, and the elbow pipe is connected with the joint pipe in a flange mode. Besides adopting rubber sheets to stop water, the pipeline joint is also sealed by injecting epoxy resin glue to stop water so as to ensure that no leakage phenomenon occurs after water is recovered.
The implementation principle of the embodiment is as follows: removing a road surface terrace, digging a groove, constructing by an SMW construction method → constructing a bored pile → constructing a soil mass compaction grouting and consolidation at the bottom of a foundation pit of 3m → maintaining → excavating a foundation pit → breaking the bored pile head at the position of the proposed inspection well under the sewage pressure, compacting and grouting and consolidating the soil mass under the bottom plate of the original sewage pressure pipe → cleaning the bottom plate and the pipeline at the position of the proposed inspection well under the original sewage pressure pipe → binding the steel bar of the proposed inspection well bottom plate, supporting a mold, pouring concrete → binding the steel bar of the top plate of the proposed inspection well wall, supporting the mold, pouring concrete → reinforcing the pipeline at the outer side of the inspection well → arranging a new sewage pressure pipe → a diver breaks the wall of the original sewage pressure pipe in the inspection well in multiple times → plugging one side seal in the inspection well → pumping treatment → installing a joint pipe and a bent head pipe → firmly pressing the cover → constructing the upper large top of the sewage pressure inspection well → constructing the yellow sand.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (8)

1. A pressure sewage pipe diversion method is characterized in that: the method comprises the following operation steps:
s1: positioning an inspection well, performing pavement breaking and old material cleaning after the positioning is finished, and excavating earthwork at the top of an original pressure sewage pipe after the cleaning is finished;
s2: an SMW method is used for enclosing the inspection well;
s3: arranging a plurality of cast-in-situ bored piles at the bottom of the inspection well, and maintaining the cast-in-situ bored piles for 25-35 days;
s4: reinforcing and maintaining soil mass 3-4m below the bottom of the inspection well for 7-10 days by adopting double-liquid layered grouting;
s5: excavating a foundation pit of the inspection well, crushing the top of the bored pile and chiseling out the main reinforcement after earthwork of the foundation pit is cleaned, and fixedly connecting the main reinforcement and the reinforcement of the inspection well bottom plate when the reinforcement of the inspection well bottom plate is bound;
s6: binding reinforcing steel bars of an inspection well bottom plate, erecting and pouring a formwork, then binding reinforcing steel bars of an inspection well wall body, erecting the inspection well wall body and a top plate formwork, binding reinforcing steel bars of a top plate, installing embedded parts of the top plate, and pouring concrete of the inspection well wall body and the top plate;
s7: excavating the new pressure sewage pipe pipeline, laying a new pressure sewage pipe in the pipeline, backfilling the pipeline after laying, and repairing the road;
s8: cutting off a pipe body of an original pressure sewage pipe in a pressure well, taking out cut residues, plugging pipe orifices on two sides of a cut by using plugging plugs in the cutting process, pumping and discharging waste water and waste gas in the inspection well after plugging is finished, installing a joint pipe and a bent pipe after pumping and discharging is finished, and finally stopping water at the joint and covering an inspection well cover.
2. The method of claim 1, further comprising the step of: the S4 specifically includes: reinforcing and maintaining soil mass 3-4m below the bottom of the inspection well for 7-10 days by adopting double-liquid layered grouting; and compacting, grouting and reinforcing the soil body with the thickness of 3-4m at the bottom of the original pressure sewage pipe, and maintaining for 7-10 days, wherein the grouting pipe is driven in a mode that: grouting pipes are obliquely inserted into soil body below the bottom plate at an angle of 45-60 degrees from the edges of the two sides of the bottom plate.
3. The method of claim 1, further comprising the step of: and S1, after earthwork at the top of the original pressure sewage pipe is removed, finely adjusting the position of the inspection well, and arranging a section of original pressure sewage pipe in the proposed inspection well.
4. The method of claim 1, further comprising the step of: the SMW construction method in the S2 comprises the following construction steps: step a 1: measuring and paying off, and excavating a guide channel; step a 2: paving guide positioning section steel on two sides of the guide channel, and marking a drilling position and a position for inserting H-shaped steel on the guide positioning section steel; step a 3: injecting cement slurry into the drilling screw rod in the ascending and descending processes, and stirring cement soil in the hole by adopting high-pressure air injection; step a 4: before the cement soil in the drill hole is condensed and hardened, the H-shaped steel is hoisted and inserted into the drill hole.
5. The method of claim 1, further comprising the step of: the construction steps of the cast-in-situ bored pile in the step S3 are as follows: step b 1: positioning the drilled hole, and marking the position of the cast-in-situ bored pile; step b 2: drilling holes by using a drilling machine, wherein the drilling mode is selected to carry out interval jumping construction; step b 3: injecting cleaned slurry into the hole, and replacing the slurry containing suspended drilling slag in the hole; step b 4: descending a reinforcement cage into the hole, and then descending a guide pipe, wherein the reinforcement cage is positioned inside the guide pipe; step b 5: injecting concrete into the guide pipe; step b6: the catheter is removed from the hole.
6. The method of claim 1, further comprising the step of: and in the process of excavating the foundation pit of the inspection well in the S5, when the excavator excavates the pit bottom to 20-50mm, manually cleaning the earthwork at the lower part of the excavator.
7. The method of claim 1, further comprising the step of: and S6, after the bottom plate, the wall body and the top plate are poured, reinforcing steel bar concrete is wrapped and fixed on a section of original pressure sewage pipe, close to the inspection well, on the outer side of the inspection well.
8. The method of claim 1, further comprising the step of: and in the S8, when the waste water and the waste gas are pumped and discharged, the toxic and harmful gas is detected before the well is lowered, and the inspection is carried out once every 1-2 h.
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