Construction method of water-carrying connection four-way inspection well for new and old sewage pipelines
By constructing connection wells at the junction of new and old sewage pipes and using wire saws to cut existing pipes, the problems of construction difficulty and high cost caused by the distance between the inspection wells of the new and old pipes were solved, achieving efficient and safe connection construction.
Patent Information
- Application Number
- CN202511117067.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-11
- Publication Date
- 2025-10-31
AI Technical Summary
When connecting old and new sewage pipes, the inspection wells of the newly built pipes are located far from the existing pipes in the current technology, which increases the difficulty and cost of construction, and the water outage construction affects residents' lives and industrial production.
By constructing connection wells at the junctions of existing and newly constructed pipelines, and using wire saws to cut existing pipelines to avoid laying new pipelines at an angle, combined with compacting the foundation, pouring concrete, and setting up pre-reserved trenches, water-supported connections can be achieved.
Shorten the construction period, reduce construction costs, and at the same time protect the health of construction workers and avoid the impact of water outages on their lives and production.
Smart Images
Figure CN120867404A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of building construction, and in particular relates to a construction method for connecting new and old sewage pipes with water in a four-way inspection well. Background Technology
[0002] With the acceleration of urbanization, urban sewage discharge continues to rise. As a key component of urban infrastructure, the construction and maintenance of sewage pipeline systems are crucial for ensuring the normal operation of cities and the quality of life for residents. Sewage pipelines are typically buried beneath roads; therefore, to expedite urbanization, new roads and new sewage pipelines are often constructed simultaneously. During the construction of new roads and new sewage pipelines, connections with existing roads and existing sewage pipelines are inevitable.
[0003] When encountering the connection between a newly constructed sewage pipeline and an existing sewage pipeline, the current practice is usually to build the new pipeline to the location of the existing pipeline's inspection well, stop the work on the existing pipeline and break up the existing pipeline's inspection well, and then complete the connection between the existing pipeline and the new pipeline and the construction of the new inspection well.
[0004] However, this method, on the one hand, requires the new pipeline to be constructed at the location of the existing pipeline's inspection well, and on the other hand, encounters... Figure 1 In situations where there are no existing manholes for the original pipelines at the intersection of a newly constructed road and an existing road, and the intersection point is far from the original manhole, the new pipeline needs to be laid diagonally to the original manhole. This increases the length of the new pipeline and the amount of excavation, leading to higher construction costs. Furthermore, halting work on existing pipelines and causing water outages will disrupt normal urban life and production. On one hand, water outages will affect residents' domestic water supply, causing dissatisfaction and complaints; on the other hand, for industrial enterprises, water outages may cause production interruptions, resulting in significant economic losses. In addition, water outage construction requires complex coordination work in advance, including notifying users and arranging temporary drainage measures, increasing the difficulty and cost of construction. Summary of the Invention
[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a construction method for connecting new and old sewage pipelines with water in a four-way inspection well, which solves the problem that the inspection wells of the newly built pipeline and the existing pipeline are far apart, resulting in increased construction difficulty and cost.
[0006] To achieve the above and other related objectives, this invention provides a method for constructing a four-way inspection well for connecting old and new sewage pipelines while the pipeline is submerged. The method includes: using large excavation equipment to excavate the upper side of the existing pipeline to 20-50 cm above the top of the existing pipeline; then using small excavation equipment to excavate the left and right sides of the existing pipeline; finally, manually excavating the bottom of the existing pipeline foundation to form a pit; constructing a connection well within the pit and simultaneously laying the newly constructed pipeline into the connection well; using a wire saw to cut the existing pipeline within the connection well, and removing the cut section; constructing a well shaft on top of the connection well and placing a prefabricated cover plate on top of the well shaft.
[0007] Optionally, large excavation equipment is used to excavate the upper side of the existing pipeline to 30-50 cm above the top of the existing pipeline, and then small excavation equipment is used to excavate the left and right sides of the existing pipeline. Finally, the bottom of the pipe foundation of the existing pipeline is excavated manually to form the foundation pit, including: drawing the dimensions of the connection well on the bottom surface.
[0008] Optionally, constructing a connection well within the foundation pit and simultaneously laying the newly constructed pipeline into the connection well includes: manually compacting the foundation of the foundation pit, then pouring an 8-15 cm thick plain concrete cushion layer at the bottom of the foundation pit; binding the reinforcing cage and installing the formwork for the connection well, laying the outlet of the newly constructed pipeline to the inside of the connection well, and then constructing the connection well by pouring concrete.
[0009] Optionally, the foundation of the pit is compacted manually. Before pouring an 8-15 cm thick plain concrete cushion layer at the bottom of the pit after compaction, the pit sidewalls are supported using anchor bolts and baffles.
[0010] Optionally, the construction of the connection well also includes binding the steel cage and formwork installation, laying the outlet of the newly constructed pipeline to the inside of the connection well, and then pouring concrete. The construction of the connection well also includes setting two reserved grooves at intervals at the bottom of the connection well during concrete pouring.
[0011] Optionally, the construction of the connection well also includes: binding the steel cage and installing the formwork, laying the outlet of the newly constructed pipeline to the inside of the connection well, and then pouring concrete. The construction of the connection well also includes: installing water-swellable strips at the connection between the newly constructed pipeline and / or the existing pipeline and the inspection well before pouring concrete.
[0012] Optionally, the existing pipeline in the docking well is cut using a wire saw. After cutting, the cut section is removed by: fixing two wire saws at intervals on the bottom surface and inserting the steering wheel rod of the wire saw into the soil of the pit at an angle; passing the saw cable through the reserved groove and connecting it to the steering wheel and the wire saw; starting the wire saw to complete the cutting of the existing pipeline; and after the cutting is completed, the cut section is removed using hoisting equipment.
[0013] Optionally, fixing two wire saws at intervals on the bottom surface and inserting the steering wheel rods of the wire saws obliquely into the soil of the foundation pit includes: the steering wheel rod includes a first rod and a second rod, the first rod is inserted into the soil of the foundation pit at a 45° angle and the insertion depth is not less than 1.5M, one end of the second rod is connected to the first rod, and the other end abuts against the top of the connection well.
[0014] Optionally, starting the wire saw to cut the existing pipe includes: pouring water onto the saw wire while cutting.
[0015] As described above, the construction method for connecting old and new sewage pipes with water in a four-way inspection well according to the present invention has at least the following beneficial effects:
[0016] 1. By constructing a connection well at the junction of the existing pipeline and the newly constructed pipeline, and then using a wire saw to cut the existing pipeline, it is possible to avoid the need to lay the new pipeline at an angle and rebuild the existing pipeline's inspection well when the new pipeline is far from the inspection well of the existing pipeline. This can shorten the construction period and reduce construction costs.
[0017] 2. After the connection well is constructed, the existing pipeline can be cut using a wire saw to achieve a water-bearing connection between the existing pipeline and the newly constructed pipeline, while also ensuring the physical and mental health of the construction workers. Attached Figure Description
[0018] Figure 1 This diagram illustrates a construction scenario where a newly constructed pipeline is far from the manhole of an existing pipeline in the prior art. The newly constructed road represents the new pipeline, while the existing road represents the existing pipeline. In this scenario, the manhole of the existing pipeline is located directly above the intersection of the existing road and the newly constructed road.
[0019] Figure 2 The diagram shown is a flowchart illustrating a construction method for connecting old and new sewage pipelines with water in a four-way inspection well according to the present invention.
[0020] Figure 3 The diagram shows the excavation of the foundation pit for a construction method of a four-way inspection well for connecting old and new sewage pipelines with water, according to the present invention.
[0021] Figure 4 The diagram shows a wire saw cutting an angle on an existing pipeline using a method for constructing a four-way inspection well for connecting old and new sewage pipelines with water, according to the present invention.
[0022] Figure 5 The diagram shows a wire saw used to cut an existing pipe at another angle, illustrating a construction method for connecting old and new sewage pipes with water in a four-way inspection well according to the present invention.
[0023] Figure 6The diagram shown is a cross-sectional view of the completed construction of a four-way inspection well, which is part of a method for constructing a new and old sewage pipeline connection with water flow according to the present invention.
[0024] Figure 7 The diagram shows the construction location of a four-way inspection well for connecting new and old sewage pipelines with water, according to the present invention. The newly built road in the diagram represents the newly constructed pipeline, and the existing road represents the existing pipeline. In this scenario, the connection well at the junction of the newly constructed pipeline and the existing pipeline is located at the intersection of the existing road and the newly constructed road.
[0025] Component designation explanation:
[0026] 1. Existing pipeline, 2. New pipeline, 3. Wire saw, 4. Plain concrete bedding layer, 5. Reserved groove, 6. Water-swellable strip, 7. Steering wheel insert rod, 61. First insert rod, 62. Second insert rod, 8. Saw cable, 9. Well shaft, 10. Cover plate. Detailed Implementation
[0027] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.
[0028] Please refer to all the accompanying drawings below. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.
[0029] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.
[0030] Please see Figure 2 This invention provides a method for constructing a four-way inspection well for connecting old and new sewage pipelines while the pipeline is submerged, comprising:
[0031] S1, as Figure 2-3As shown, firstly, large excavating equipment is used to excavate the upper side of the existing pipeline 1 to 20-50 cm above the top of the existing pipeline 1, specifically to 30 cm above the top of the existing pipeline 1, to avoid damaging the existing pipeline 1 with the large excavating equipment. Then, small excavating equipment is used to excavate the left and right sides of the existing pipeline 1. Finally, manual excavation is used to excavate the bottom of the pipe foundation of the existing pipeline 1 to form a foundation pit. Large excavating equipment can be large excavators, which can improve construction efficiency. Small excavating equipment can be small excavators, which can avoid damaging the existing pipeline 1. A gap of at least 20-40 cm, preferably 30 cm, is reserved at the bottom of the pipe foundation of the existing pipeline 1 to facilitate the subsequent construction of the connection well.
[0032] Before step S1, it also includes determining the positional relationship between the connection well and the original inspection well according to the drawings, determining the elevation of the top of the original pipeline, the location of the connection well, whether the foundation pit needs support after excavation, and drawing the dimensions of the connection well on the bottom surface to facilitate subsequent construction.
[0033] S2, construct a connection well in the foundation pit, and simultaneously lay the newly constructed pipeline 2 into the connection well.
[0034] like Figure 4 As shown, in this step, if the foundation pit requires support, the side walls of the foundation pit are first supported using structures such as anchor bolts and baffles to prevent the foundation pit from collapsing and causing safety accidents. Then, the foundation of the foundation pit can be compacted manually using tamping equipment. After compaction, an 8-15 cm plain concrete cushion layer 4 is poured at the bottom of the foundation pit as a supporting foundation to prevent settlement of the connected well after construction.
[0035] After the plain concrete layer is poured, the reinforcing cage for the connection well is tied and the formwork is installed. At the same time, the outlet of the newly constructed pipe 2 is laid to the inside of the connection well, and then concrete is poured to complete the construction of the connection well. To prevent sewage from leaking from the connection between the existing pipe 1 and the newly constructed pipe 2 and the wall of the connection well, water-swellable strips 6 can be installed on the outer walls of the existing pipe 1 and the newly constructed pipe 2 to achieve a seal.
[0036] The existing pipe 1 typically serves as the outlet for sewage, and its distance from the bottom of the connection well is usually smaller than that of the newly constructed pipe 2. Furthermore, to prevent sewage residue in the connection well, the original base of the existing pipe 1 is usually cast together with the bottom of the connection well. To facilitate subsequent cutting of the existing pipe 1, in this embodiment, two pre-reserved grooves 5 are spaced apart at the bottom of the connection well during concrete pouring. These grooves 5 can be semi-circular PVC pipes with a diameter larger than the saw cable 8, placed on the concrete surface at the bottom of the connection well during the pouring process, with the openings of the PVC pipes facing the top of the connection well.
[0037] S3, use wire saw 3 to cut the existing pipe 1 in the docking well, and then remove the cut section.
[0038] like Figure 4-5 As shown, in this step, two wire saws 3 are first fixed at intervals on the bottom surface, and the steering wheel rods 7 of the wire saws 3 are inserted obliquely into the soil of the foundation pit. Specifically, there are two steering wheel rods 7, one of which is located as shown in the figure. Figure 4 The left side of the center is set up, and another steering wheel insert 7 is located as shown in the image. Figure 4 The right side of the structure is provided. Each steering wheel insert 7 may include a first insert 61 and a second insert 62. The first insert 61 is inserted into the soil of the foundation pit at a 45° angle, and the insertion depth is not less than 1.5M. One end of the second insert 62 is connected to the first insert 61, and the other end abuts against the bottom of the connecting well, thereby forming a triangular support structure to ensure the stability of the steering wheel insert 7.
[0039] After the steering wheel insert 7 is fixed, the sawing cable 8 is passed through the reserved slot 5 and, after being reversed by the steering wheel insert 7, is connected to the wire saw 3. The wire saw 3 can then be activated to cut the existing pipe 1. During the cutting process, to prevent the sawing cable 8 from overheating and affecting its performance, water can be poured onto the sawing cable 8 to cool it down.
[0040] After cutting, the cut section is removed using hoisting equipment. Before cutting, the hoisting equipment can be pre-attached to the section using steel cables or other structures. This avoids the need to attach the equipment after cutting, thus preventing the air inside the sewage pipe from affecting the health of the operators.
[0041] S4, construct a shaft 9 on top of the connecting shaft and cover the shaft 9 with a prefabricated cover plate 10.
[0042] like Figure 6 As shown, in this step, a reinforcing cage and support formwork are first tied to the top of the connection well, and then concrete is poured to form the well shaft 9. A ladder can be installed on the well shaft 9 for subsequent maintenance. After the well shaft 9 is constructed, a pre-set cover plate 10 is laid on the well shaft 9. Then the foundation pit is backfilled to complete the entire construction.
[0043] In summary, such as Figure 7As shown in this embodiment, a method for constructing a four-way inspection well for connecting new and old sewage pipelines while the pipeline is still wet is provided. During construction, the connection well between the new pipeline and the existing pipeline is built at the intersection of the newly constructed road and the existing road, that is, at the connection point of the existing pipeline 1 and the newly constructed pipeline 2. Then, a wire saw 3 is used to cut the existing pipeline 1. This avoids the need to lay the new pipeline 2 at an angle and rebuild the inspection well of the existing pipeline 1 when the inspection well of the newly constructed pipeline 2 is far away from the inspection well of the existing pipeline 1, thus shortening the construction period and reducing construction costs. In addition, after the connection well is constructed, the existing pipeline 1 can be cut with the wire saw 3 to achieve a wet connection between the existing pipeline 1 and the newly constructed pipeline 2, while also ensuring the physical and mental health of the construction personnel. This method effectively overcomes the various shortcomings of the prior art and has high industrial application value.
[0044] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.
Claims
1. A method for constructing a four-way inspection well for connecting new and old sewage pipes while the pipes are in use, characterized in that: include: Large excavation equipment is used to excavate the upper side of the existing pipeline to 20-50 cm above the top of the existing pipeline. Then, small excavation equipment is used to excavate the left and right sides of the existing pipeline. Finally, the bottom of the pipe foundation of the existing pipeline is excavated manually to form a foundation pit. Construct a connection well inside the foundation pit and simultaneously lay the newly constructed pipeline into the connection well; The existing pipes inside the docking well were cut using a wire saw, and the cut section was then removed. A shaft is constructed on top of the connection well, and a prefabricated cover plate is placed on top of the shaft.
2. The construction method for a four-way inspection well for connecting new and old sewage pipelines with water as described in claim 1, characterized in that: Before the process of using large excavation equipment to excavate the upper side of the existing pipeline to 30-50 cm above the top of the existing pipeline, and then using small excavation equipment to excavate the left and right sides of the existing pipeline, and finally manually excavating the bottom of the existing pipeline foundation to form the foundation pit, the following steps are taken: drawing the dimensions of the connection well on the bottom surface.
3. The construction method for a four-way inspection well for connecting new and old sewage pipelines with water as described in claim 1, characterized in that: The construction of a connection well within the foundation pit, and the simultaneous laying of the newly constructed pipeline into the connection well, includes: The foundation of the pit is compacted manually, and then an 8-15 cm thick plain concrete cushion layer is poured at the bottom of the pit. The steel cage for the connection well is tied and the formwork is installed. The outlet of the newly built pipeline is laid inside the connection well, and then concrete is poured to construct the connection well.
4. The construction method for a four-way inspection well for connecting new and old sewage pipelines with water as described in claim 3, characterized in that: The process of manually compacting the foundation of the pit, before pouring an 8-15 cm thick plain concrete cushion layer at the bottom of the pit, also includes: Anchor bolts and baffles are used to support the sidewalls of the foundation pit.
5. The construction method for a four-way inspection well for connecting new and old sewage pipelines with water as described in claim 3, characterized in that: The construction of the connection well also includes: binding the reinforcing cage and installing the formwork, laying the outlet of the newly constructed pipeline inside the connection well, and then pouring concrete. When pouring concrete, two reserved slots are set at intervals at the bottom of the connection well.
6. A construction method for a four-way inspection well for connecting new and old sewage pipelines with water as described in any one of claims 3-5, characterized in that: The construction of the connection well also includes: binding the reinforcing cage and installing the formwork, laying the outlet of the newly constructed pipeline inside the connection well, and then pouring concrete. Before pouring concrete, install water-swellable strips at the connection points between newly constructed pipes and / or existing pipes and inspection wells.
7. The construction method for a four-way inspection well for connecting new and old sewage pipelines with water as described in claim 5, characterized in that: The process of using a wire saw to cut the existing pipes inside the docking well and then removing the cut section includes: Two wire saws are fixed at intervals on the bottom surface, and the steering wheel rods of the wire saws are inserted obliquely into the soil of the foundation pit. Pass the saw wire through the pre-drilled slot and connect it to the steering wheel and wire saw. Start the wire saw to cut the existing pipe; After cutting, the cut section is removed using hoisting equipment.
8. The construction method for a four-way inspection well for connecting new and old sewage pipelines with water as described in claim 6, characterized in that: The step of fixing two wire saws at intervals on the bottom surface and inserting the steering wheel rods of the wire saws obliquely into the soil of the foundation pit includes: The steering wheel insertion rod includes a first insertion rod and a second insertion rod. The first insertion rod is inserted into the soil of the foundation pit at a 45° angle and the insertion depth is not less than 1.5M. One end of the second insertion rod is connected to the first insertion rod, and the other end abuts against the top of the connection well.
9. A method for constructing a four-way inspection well for connecting new and old sewage pipelines with water as described in claim 6, characterized in that: Starting the wire saw to cut the existing pipe includes: Water is poured onto the saw blade while cutting.