Construction method for connection and intercommunication of new pipe network and old pipe network

Abstract

The invention relates to a construction method for connecting and intercommunicating new and old pipe networks, which is used for constructing and forming a connecting channel for communicating a new well and an old well, and comprises the following steps: paying off according to the design position of the connecting channel, and reinforcing the peripheral soil body at the arrangement position of the connecting channel; a connecting channel is excavated in the new well, and in the excavation process, steel pipes are arranged in the channel formed through excavation so as to support the channel formed through excavation; and when excavation is conducted to the position of the old well, a connecting hole is dug in the well wall of the old well, and therefore construction of the connecting channel is completed. According to the construction method for connection and intercommunication of the new pipe network and the old pipe network, through the sequence of firstly reinforcing the soil body and then excavating the connecting channel, construction safety can be guaranteed, the connecting channel is excavated in the underground mode, and the influence on municipal traffic is reduced.

Description

Technical Field

[0001] This invention relates to the field of pipeline construction technology, and specifically to a construction method for connecting and interconnecting new and old pipeline networks. Background Technology

[0002] In recent years, major and medium-sized cities have increased their investment in municipal drainage network construction to address the frequent urban flooding problem. After the completion of new municipal drainage networks, to maximize their comprehensive benefits, it is necessary to connect the new networks with existing ones. Connecting channels are constructed between adjacent new and old municipal manholes (working or receiving manholes) to achieve interconnection. The construction of these connecting channels typically employs the trenching and pipe-laying method, which requires the construction of retaining structures, earthwork excavation, and pipe laying. When the connecting channel is buried at a considerable depth, this method suffers from problems such as a long construction period for the retaining structure, large earthwork excavation volume, the need to relocate nearby underground pipelines, and significant environmental impact. If a traction method (such as pipe pulling) is used to lay the connecting channel, it is only suitable for small-diameter pipes and cannot meet the engineering requirements for large pipelines in major urban drainage networks.

[0003] Furthermore, the construction environment is unfavorable. The soil layer where the connecting pipeline is located is soft soil, which is easily disturbed, causing uneven settlement of the foundations of surrounding buildings; the construction area is limited, making it unsuitable for large-scale machinery construction; there is a significant water level difference between the old and new wells, posing a considerable safety risk to direct connection. Traditional construction methods would waste a lot of manpower and resources, further increasing construction costs, and would also affect urban traffic, causing inconvenience to people's travel. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art and provide a construction method for connecting and interconnecting new and old pipelines. This method solves the problems of limited construction area, unfavorable conditions for large-scale machinery construction, easy soil disturbance, easy uneven settlement of the foundations of surrounding buildings, and large water level difference between new and old wells, which pose significant safety risks when directly connecting them.

[0005] The technical solution to achieve the above objective is: a construction method for connecting and interconnecting new and old pipelines, used to construct a connecting channel between a new well and an old well, comprising the following steps: laying out the design location of the connecting channel and reinforcing the surrounding soil at the location of the connecting channel; excavating the connecting channel from the new well, and during the excavation process, laying steel pipes in the excavated channel to support the excavated channel; when excavating to the location of the old well, chiseling a connecting hole in the wall of the old well, thereby completing the construction of the connecting channel.

[0006] In the construction method for connecting and interconnecting old and new pipelines according to the present invention, the construction safety can be ensured by first reinforcing the soil and then excavating the connecting channel, and the underground excavation of the connecting channel reduces the impact on municipal traffic.

[0007] A further improvement of the construction method for connecting and interconnecting new and old pipelines of the present invention is that the step of laying out the lines according to the design location of the connection channel and reinforcing the surrounding soil at the location of the connection channel includes: setting cast-in-place piles around the new well; and setting jet grouting piles on the outside of the cast-in-place piles and on both sides of the connection channel.

[0008] A further improvement of the construction method for connecting and interconnecting new and old pipelines of the present invention is that, in the process of excavating the connecting channel from the new well, steel pipes are laid in the channel to support the channel formed during the excavation process, which includes: excavating the connecting channel towards the old well according to the reserved opening set on the new well.

[0009] A further improvement of the construction method for connecting and interconnecting new and old pipelines of the present invention is that, in the process of excavating the connecting channel from the new well, the method of laying steel pipes in the channel formed by excavation to support the channel formed by excavation further includes: pouring concrete channel walls in the steel pipes.

[0010] A further improvement of the construction method for connecting and interconnecting old and new pipelines of the present invention is that, when the old well is excavated, a connection hole is chiseled out on the well wall of the old well to complete the construction of the connection channel, which includes: according to the connection channel, laying out the outer ring of the connection hole on the well wall.

[0011] A further improvement of the construction method for connecting and interconnecting new and old pipelines of the present invention is that, when excavating to the location of the old well, the construction of the connection channel is further improved by: drilling holes in sections within the outer ring opening to form a porous well wall for support.

[0012] A further improvement of the construction method for connecting and interconnecting old and new pipelines of the present invention is that, when the old well is excavated, a connecting hole is chiseled out on the well wall of the old well to complete the construction of the connecting channel, which further includes: injecting water into the new well to keep the water level in the new well consistent with that in the old well; and chiseling away the porous well wall underwater to complete the construction of the connecting hole.

[0013] A further improvement of the construction method for connecting and interconnecting old and new pipelines of the present invention is that, when the old well is excavated, a connection hole is chiseled in the well wall of the old well to complete the construction of the connection channel, which further includes: welding the steel pipe to the exposed structural steel bars on the well wall.

[0014] A further improvement of the construction method for connecting and interconnecting old and new pipelines of the present invention is that, when the old well is excavated, the construction of the connection channel is further improved by chiseling a connection hole in the well wall of the old well to complete the construction of the connection channel, which also includes filling the gap between the well wall and the steel pipe.

[0015] A further improvement of the construction method for connecting and interconnecting old and new pipelines of the present invention is that, when the old well is excavated, a connection hole is chiseled out on the well wall of the old well to complete the construction of the connection channel, which further includes: conducting a water tightness test in the connection channel.

[0016] The advantages of the construction method for connecting and interconnecting new and old pipelines in this invention are as follows: (1) The use of non-excavation interconnection technology such as foundation soil reinforcement and underground pipeline excavation effectively solves the problem of limited construction area and unfavorable large-scale machinery construction. (2) The well wall at the connection of the new and old pipelines is chiseled out using micro-vibration, zoned drilling, and static cutting separation technology, and chiseled out in two stages. This can effectively solve the problem that the soil layer where the connecting pipeline is located is soft soil, which is easily disturbed and causes uneven settlement of the foundation of surrounding buildings. (3) Customized steel pipes are used for connecting pipelines. The steel pipes are welded to the steel bars at the chiseling wall, and the opening and steel pipe are sealed with grout. The inner wall of the steel pipe is poured with concrete. When connecting underwater, slag-free treatment technology is used. This can avoid the large water level difference between the new and old wells, which poses a large safety risk for direct connection. (4) Static cutting separation technology using diamond thin-walled drill is used. Water cooling is used during drilling to carry away the grinding dust, resulting in low noise, no vibration, no dust pollution, minimal disturbance to the original structure, simple and flexible use, and high construction efficiency. (5) It effectively solves the problems of large impact on the surrounding environment and long construction period caused by the trenching and pipe laying scheme. The connection between the old and new pipelines is achieved through steps such as jet grouting to control soft soil deformation, step-by-step excavation of connecting areas, underground cast-in-place connection channels, and underwater connection. Attached Figure Description

[0017] Figure 1 This is a schematic flowchart of a construction method for connecting and interconnecting old and new pipeline networks according to the present invention.

[0018] Figure 2 This is a cross-sectional view of the trenchless interconnection of the old and new pipelines according to the present invention.

[0019] Figure 3 This is a flowchart illustrating step S110 of the present invention.

[0020] Figure 4 This is a flowchart illustrating step S120 of the present invention.

[0021] Figure 5 This is a cross-sectional view of the connection channel of the present invention.

[0022] Figure 6 This is another schematic diagram of step S120 of the present invention.

[0023] Figure 7 This is a flowchart illustrating step S130 of the present invention.

[0024] Figure 8 This is a schematic diagram of the structure of the partitioned drilling on the well wall of the old well according to the present invention.

[0025] Figure 9 This is another flowchart illustrating step S130 of the present invention.

[0026] Figure 10 This is another flowchart illustrating step S130 of the present invention.

[0027] Figure 11 This is a schematic diagram of the connection opening on the wall of the old well according to the present invention.

[0028] Figure 12 This is another flowchart illustrating step S130 of the present invention.

[0029] Figure 13 This is another flowchart illustrating step S130 of the present invention.

[0030] Figure 14 This is another flowchart illustrating step S130 of the present invention.

[0031] In the diagram: 1. New well; 2. Old well; 21. Old drainage pipe; 22. Connecting opening; 23. Outer ring opening; 24. Drill hole; 25. Porous well wall; 26. Upper removal area; 27. Lower removal area; 3. Connecting passage; 4. Cast-in-place pile; 5. Jet grouting pile; 6. Steel pipe. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] See Figure 1 and Figure 2 , Figure 1 The diagram shows a construction method for connecting and interconnecting new and old pipeline networks according to the present invention. Figure 2 This invention displays a cross-sectional view of a trenchless interconnection between new and old pipeline networks. The invention provides a construction method for connecting and interconnecting new and old pipeline networks, used to construct a connecting channel 3 linking a new well 1 and an old well 2, comprising the following steps: Step S110: Lay out the lines according to the design location of the connecting channel 3, and reinforce the surrounding soil at the location of the connecting channel 3.

[0034] First, the new and old drainage pipe networks are surveyed. A total station is used to measure the locations of the new and old underground municipal drainage pipe networks, determining the locations of new manhole 1 and old manhole 2. The location of connecting passage 3 is then laid out, using the location of the manhole at the starting point of the rainwater and sewage pipes as the control point for pipe location. The locations of the manholes are recorded. During construction, the old drainage pipe network is in use, and old manhole 2 is connected to old drainage pipe 21, containing accumulated water. The water level in old manhole 2 is high, and the water levels in both old manhole 2 and old drainage pipe 21 are recorded. Since the bottom of connecting passage 3 is below ground level, reinforcing the surrounding foundation soil of the construction area can prevent water seepage or quicksand, ensuring construction safety. Next, step S120 is executed.

[0035] Execution step S120: Excavate the connecting channel 3 from the new well 1. During the excavation process, lay steel pipes 6 in the excavated channel to support the excavated channel.

[0036] In this process, steel pipes 6 are laid in the passage to support the side wall earthwork and prevent collapse and damage to the passage. The steel pipes 6 are connected by splicing multiple steel pipe sections. The prefabricated steel pipe sections are installed to support the side wall of the connecting passage 3 using a crawler crane and auxiliary tools. During the excavation process, the steel pipe sections can be laid while the connecting passage is being excavated, or the steel pipe sections can be laid after the connecting passage has been excavated. The laying method is selected according to the actual length of the connecting passage. No specific restrictions are imposed here. Then, step S130 is executed.

[0037] Step S130: When the excavation reaches the location of the old well 2, a connecting hole 22 is chiseled out on the well wall of the old well 2, thereby completing the construction of the connecting passage 3.

[0038] Among them, the old well 2, the connecting passage 3 and the new well 1 are connected by the connecting opening 22.

[0039] See Figure 2 and Figure 3 , Figure 2 This invention displays a cross-sectional view of the trenchless interconnection between the old and new pipeline networks. Figure 3 A flowchart illustrating step S110 of the present invention is shown. The present invention provides a construction method for connecting and interoperating new and old pipeline networks, wherein step S110 includes: Step S111: Install cast-in-place piles 4 around the outer perimeter of the new well 1.

[0040] In this process, the area where the cast-in-place piles 4 are installed avoids the excavation location of the connecting channel 3. The cast-in-place piles 4 are installed along the outer wall of the new well 1. Then, step S112 is executed.

[0041] Step S112: Install jet grouting piles 5 on the outside of the cast-in-place pile 4 and on both sides of the connecting channel 3.

[0042] The location and number of jet grouting piles 5 are determined according to actual construction needs and are not specifically limited here.

[0043] See Figure 4 and Figure 5 , Figure 4 A flowchart of step S120 of the present invention is shown. Figure 5 A cross-sectional view of the connection channel of the present invention is shown. The present invention provides a construction method for connecting and interconnecting new and old pipeline networks, step S120 including: Execution step S121: Based on the reserved opening set on the new well 1, dig out the connecting channel 3 towards the old well 2.

[0044] After the soil around the connecting passage 3 is reinforced, the reserved opening on the new well 1 is opened, and a pneumatic drill is used to excavate towards the old well 2 until the wall of the old well 2 is reached.

[0045] See Figure 6 This diagram illustrates another flow chart of step S120 of the present invention. The present invention provides a construction method for connecting and interoperating new and old pipeline networks, wherein step S120 further includes: Step S122: Pour concrete channel wall inside steel pipe 6.

[0046] The process of pouring concrete for the passage wall includes tying reinforcing bars, setting up formwork, pouring concrete in sections, and grouting to fill leaks after pouring at the top, thus completing the erection of the connecting passage 3.

[0047] See Figure 7 and Figure 8 , Figure 7 A flowchart of step S130 of the present invention is shown. Figure 8 This invention illustrates a schematic diagram of the sectioned drilling structure on the well wall of an existing well. The invention provides a construction method for connecting and interconnecting old and new pipeline networks, step S130 of which includes: Execution step S131: According to the connection channel 3, lay out the outer ring 23 of the connection opening 22 on the well wall.

[0048] The size of the outer ring 23 corresponds to the size of the connecting channel 3, and no specific restrictions are imposed here.

[0049] See Figure 8 and Figure 9 , Figure 8 This invention displays a schematic diagram of the structure of the partitioned drilling on the well wall of an existing well. Figure 9 Another flowchart of step S130 of the present invention is shown. The present invention provides a construction method for connecting and interoperating new and old pipeline networks, and step S130 further includes: Step S132: Drill holes 24 in sections within the outer ring 23 to form a porous well wall 25 for support.

[0050] In this process, on one side of the connecting channel 3, holes 24 are drilled into the dry wall of the old well 2. First, holes are drilled along the outer edge of the outer ring 23, and then holes are drilled along the intersection lines of the diameters of the outer ring 23. The excavation area of ​​the connecting opening 22 on the well wall is divided into 12 sections, and holes are drilled in each section until the entire excavation surface is filled. Note that the depth of the drill holes 24 is less than the thickness of the old well 2 wall, and the drill holes 24 do not connect the connecting channel 3 to the old well 2.

[0051] In this embodiment, to avoid the vibration generated during drilling affecting the structure of the old well 2, a static cutting and separation technology using a diamond thin-walled drill is adopted. The drilling machine 24 drives the diamond thin-walled drill bit to apply pressure and rotate, and the diamond particles grind and cut the steel bars and concrete of the well wall. Water cooling is used during the drilling process to carry away the grinding dust.

[0052] In this embodiment, the diameter of the drill hole 24 is 150mm. After drilling the hole 24 to the designed depth, a steel chisel is driven into the drill joint to break the drill core. The drill core is then removed using a wire loop. The depth of the drill hole 24 is then checked to ensure it meets the construction requirements, until the entire cross-section reaches the preset drilling depth of the drill hole 24. In other embodiments, the diameter and depth of the drill hole 24 can be set according to actual construction needs, and no specific limitations are imposed here.

[0053] See Figure 10 and Figure 11 , Figure 10 Another flowchart of step S130 of the present invention is shown. Figure 11 This invention illustrates a structural diagram of the connection opening on the wall of an existing well. The invention provides a construction method for connecting and interconnecting old and new pipeline networks, with step S130 further including: Execute step S133: Inject water into the new well 1 to maintain the water level in the new well 1 consistent with that in the old well 2.

[0054] Among them, the porous well wall 25 left by drilling 24 is used to withstand the water pressure in the old well 2, which can protect the construction safety. Then, step S134 is executed.

[0055] Step S134: Remove the porous well wall 25 underwater to complete the construction of the connecting opening 22.

[0056] Within the old well 2, the inner ring of the connecting opening 22 was laid out. A horizontal dividing line was then established within the inner ring, separating the upper removal zone 26 and the lower removal zone 27. During the construction of the upper removal zone 26, except for a certain length at the bottom remaining connected to the original structure, a diamond thin-walled drill was used underwater to separate the upper part of the remaining well wall from the original structure using a drill string. During the construction of the lower removal zone 27, a pneumatic pick was used underwater to chisel away the reinforced concrete from the remaining well wall from top to bottom. The removed concrete blocks were manually dredged ashore. The water flow velocity was reduced using a pump station to maintain a calm water environment as much as possible. During the chiseling process, a small amount of reinforced concrete blocks may fall into the pipe; all reinforced concrete blocks and debris generated during the entire construction process were dredged ashore. At this point, the connection work was completed, achieving underwater tunneling.

[0057] In this embodiment, communication and coordination with the operating unit are required before chiseling away the porous well wall 25, and the work should be carried out when the water level is at its lowest during the day. The location of the old well 2 opening is marked, and water is injected into the new well 1 until the water level in the new well 1 is the same as the water level in the old well.

[0058] See Figure 12 This illustrates another flowchart of step S130 of the present invention. The present invention provides a construction method for connecting and interoperating new and old pipeline networks, and step S130 further includes: Step S135: Weld the wall of steel pipe 6 to the exposed structural steel bars on the well wall.

[0059] Among them, the connecting channel 3 is extended by splicing multiple sections of steel pipe 6, and the steel pipe 6 that connects to the wall of the old well 2 is required.

[0060] See Figure 13 This illustrates another flowchart of step S130 of the present invention. The present invention provides a construction method for connecting and interoperating new and old pipeline networks, and step S130 further includes: Perform step S136: Fill the gap between the well wall and the steel pipe 6.

[0061] Among them, grouting is performed between the opening of the connecting channel 3 and the steel pipe 6. The gap between the opening and the steel pipe 6 is filled with compaction grouting. Alternatively, bricks and waterproof mortar can be used to seal the gap, and a quick-setting agent can be added to the mortar.

[0062] See Figure 14 This illustrates another flowchart of step S130 of the present invention. The present invention provides a construction method for connecting and interoperating new and old pipeline networks, and step S130 further includes: Perform step S137: Conduct a water tightness test in the connecting channel 3.

[0063] In this embodiment, a water tightness test is required to test the airtightness of the connecting channel 3. An inflatable airbag is used to block one end of the connecting channel 3, and then water is injected into the connecting channel 3 to test whether it leaks.

[0064] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A construction method for connecting and interconnecting new and old pipeline networks, used to construct a connecting channel linking a new well and an old well, characterized in that, Includes the following steps: The design location of the connecting channel is laid out, and the surrounding soil at the location of the connecting channel is reinforced. The connecting passage is excavated from the new well. During the excavation process, steel pipes are laid in the excavated passage to support it. When the excavation reaches the location of the old well, a connecting hole is chiseled out on the well wall of the old well, thereby completing the construction of the connecting passage.

2. The construction method for connecting and intersecting new and old pipeline networks according to claim 1, characterized in that, The step of laying out the lines according to the design location of the connecting channel and reinforcing the surrounding soil at the location of the connecting channel includes: Cast-in-place piles are installed around the outer perimeter of the new well; Jet grouting piles are installed on the outside of the cast-in-place piles and on both sides of the connecting channel.

3. The construction method for connecting and intersecting new and old pipeline networks according to claim 1, characterized in that, The process of excavating the connecting channel from the new well, including laying steel pipes within the excavated channel to support it, comprises: Based on the reserved opening in the new well, the connecting channel is excavated towards the old well.

4. The construction method for connecting and intersecting new and old pipeline networks according to claim 1, characterized in that, The process of excavating the connecting channel from the new well, including laying steel pipes within the excavated channel to support it, further includes: A concrete channel wall was poured inside the steel pipe.

5. The construction method for connecting and intersecting new and old pipeline networks according to claim 1, characterized in that, When excavation reaches the location of the old well, the construction of the connecting passage involves chiseling a connecting hole in the well wall to complete the construction of the connecting passage. According to the connection channel, a line is laid out on the outer ring of the connection opening on the well wall.

6. The construction method for connecting and intersecting new and old pipeline networks according to claim 5, characterized in that, The process of excavating a connecting hole in the well wall when reaching the location of the old well to complete the construction of the connecting passage also includes: Drill holes in sections within the outer ring to form a porous well wall for support.

7. The construction method for connecting and intersecting new and old pipeline networks according to claim 6, characterized in that, The process of excavating a connecting hole in the well wall when reaching the location of the old well to complete the construction of the connecting passage also includes: Water is injected into the new well to maintain the water level in the new well at the same level as that in the old well. The porous well wall is removed underwater to complete the construction of the connecting opening.

8. The construction method for connecting and intersecting new and old pipeline networks according to claim 6, characterized in that, The process of excavating a connecting hole in the well wall when reaching the location of the old well to complete the construction of the connecting passage also includes: Water is injected into the new well to maintain the water level in the new well at the same level as that in the old well. The porous well wall is removed underwater to complete the construction of the connecting opening.

9. The construction method for connecting and intersecting new and old pipeline networks according to claim 1, characterized in that, The process of excavating a connecting hole in the well wall when reaching the location of the old well to complete the construction of the connecting passage also includes: The gap between the well wall and the steel pipe is filled.

10. The construction method for connecting and intersecting new and old pipeline networks according to claim 1, characterized in that, The process of excavating a connecting hole in the well wall when reaching the location of the old well to complete the construction of the connecting passage also includes: A water tightness test was conducted within the connecting channel.

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