A new and old drainage pipe connection structure and its construction method under the non-interception working condition

Abstract

A new and old drainage pipe connection structure and its construction method under the condition of no flow interception, including a caisson arranged beside the old drainage pipe that needs to be connected and diverted, a water-stop curtain arranged at the bottom and periphery of the caisson, and a water-stop curtain arranged at the top, periphery and bottom of the old drainage pipe. The present invention also includes a construction method for the new and old drainage pipe connection structure under the condition of no flow interception. The technology involved in the present invention is simple, the degree of mechanized operation is relatively high, the construction safety can be ensured, and the construction period is controllable.

Description

Technical Field

[0001] The present invention relates to the field of connection construction of new and old drainage pipes, and particularly to a connection structure and construction method of new and old drainage pipes under non-interception conditions. Background Art

[0002] Due to the continuous growth of the urban population, the old drainage pipes have been operating overloaded all year round and need to be diverted, or there are new drainage pipes that need to be connected to the old drainage pipes. Due to the limitations of the original planning and design, there are often no reserved connection ports in the old drainage pipes. When connecting new and old drainage pipes, the following problems will be faced: the drainage pipes (especially sewage pipes) are in operation all year round and cannot be intercepted, and the connection needs to be carried out under non-interception conditions. The water flow velocity in the pipes is fast, and it is very dangerous for personnel to directly enter the operation. Due to the lack of reservation, it is also very difficult to handle the connection port. The drainage pipes are often buried deeply, and the construction by the open cut method is difficult, has great potential safety hazards, and has a great impact on the surrounding area. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a connection structure and construction method of new and old drainage pipes under non-interception conditions, which can realize the connection and diversion of drainage pipes under non-interception conditions and ensure the safety, environmental protection, high quality and high efficiency of the construction process.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] The connection structure of new and old drainage pipes under non-interception conditions of the present invention includes a caisson arranged beside the old drainage pipe that needs to be connected and diverted, a jet grouting pile water stop curtain arranged at the bottom and periphery of the caisson, and a jet grouting pile water stop curtain arranged at the top, periphery and bottom of the old drainage pipe. The caisson and the water stop curtain cooperate to form the main structure of the connection structure. The function of the caisson is to provide an operation space for connecting and diverting the old drainage pipe into the new drainage pipe, and the function of the water stop curtain is to eliminate the adverse effects of groundwater, quicksand, etc. on the construction, protect structures such as old drainage pipes and prevent sewage leakage after successful connection.

[0006] Further, the caisson is a reinforced concrete polygonal well; the water stop curtain at the bottom and periphery of the caisson is a jet grouting pile water stop curtain, the water stop curtain at the top and periphery of the old drainage pipe is a jet grouting pile water stop curtain, and the water stop curtain at the bottom of the old drainage pipe is a large-diameter MJS method pile water stop curtain.

[0007] Further, the distance between the well wall of the caisson and the pipe wall of the old drainage pipe is 500 mm - 800 mm.

[0008] Further, the distance between the water stop curtain around the caisson and the caisson is 500 mm - 800 mm.

[0009] Furthermore, a connection opening for the old drainage pipe is reserved in the caisson, and it is sealed with lime sand bricks before the caisson sinks.

[0010] Furthermore, the cut-off walls around the caisson, as well as the cut-off walls on the top and around the old drainage pipe, adopt double-row jet grouting piles with an overlap of 200 ± 20 mm. The top elevation of the piles is the same as the top elevation of the caisson, and the bottom elevation of the piles is 5 m lower than the bottom elevation of the caisson. The cut-off wall at the bottom of the caisson adopts double-row jet grouting piles with an overlap of 100 ± 10 mm. The top elevation of the piles is the same as the bottom elevation of the caisson, and the bottom elevation of the piles is 3 m lower than the bottom elevation of the caisson. The pile diameter is 600 mm - 800 mm. The treatment range of the cut-off wall at the old drainage pipe exceeds the connection position by no less than 2 m. The cut-off wall at the bottom of the old drainage pipe adopts large-diameter (radius 1500 mm - 1800 mm) MJS method piles.

[0011] The construction method of the connection structure between the new and old drainage pipes under the non-interception condition of the present invention includes the following steps:

[0012] S1: Construct the cut-off walls at the bottom and around the caisson, at the top and around the old drainage pipe, excluding the part between the caisson and the old drainage pipe. Construction is carried out from the periphery to the middle. For parts where it is difficult to construct the cut-off wall such as at the bottom of the old drainage pipe, large-diameter MJS method piles are used for construction;

[0013] S2: Fabricate and sink the caisson, and connect the new drainage pipe to the caisson;

[0014] S3: Construct the cut-off wall at the part between the caisson and the old drainage pipe, and the cut-off wall is overlapped with the caisson and the old drainage pipe;

[0015] S4: Demolish the lime sand brick wall at the connection opening of the old drainage pipe reserved in the caisson, and use manual labor to excavate the soil to the wall of the old drainage pipe;

[0016] S5: Fill the caisson with water until the water surface elevation in the caisson is flush with the water surface elevation of the old drainage pipe;

[0017] S6: Carry out manual underwater operation to demolish the concrete on the wall of the old drainage pipe to achieve the connection between the new and old drainage pipes.

[0018] The connection point of the connection between the new and old drainage pipes described in the present invention is not limited to the old drainage pipe, and the connection position can also be structures such as inspection wells.

[0019] The present invention preferably makes the connection on vertical structures such as inspection wells (preferably square structures) on the old drainage pipe line.

[0020] The present invention preferably uses a diamond wire saw to cut and demolish the concrete on the wall of the old drainage pipe.

[0021] The beneficial effects of the present invention are as follows: Compared with the previous construction methods, the present invention combines engineering practice and proposes to use a caisson combined with a water-stop curtain as the connection and conversion space for the new and old drainage pipes, and adopts the construction method of underwater cutting the pipe wall after the water pressure is balanced, which well overcomes the problems of great construction safety hazards, great difficulty in protecting the old drainage pipes, and great impacts on the surrounding traffic, life and environment. At the same time, the jet grouting pile water-stop curtain and caisson construction technology are mature, simple and reliable, with a high degree of mechanization in the construction process, safe, environmentally friendly, reliable in quality and controllable in construction period. The present invention is particularly suitable for projects such as municipal drainage renovation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic diagram of an embodiment of the connection structure of the new and old drainage pipes under the non-intercepting flow condition of the present invention;

[0023] Figure 2 is Figure 1 a side view of the shown embodiment;

[0024] In the figure: 1-old drainage pipe, 2-new drainage pipe, 3-jet grouting pile constructed before caisson production, 4-bottom swing jet grouting of old drainage pipe, 5-reinforced concrete caisson, 6-jet grouting pile constructed after caisson sinking, 7-caisson cover plate, 8-inspection wellhead. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments. Embodiment

[0026] Referring to Figure 1 - Figure 2 , a connection structure of new and old drainage pipes under the non-intercepting flow condition includes a reinforced concrete caisson 5 arranged beside the old drainage pipe 1 that needs to be connected and diverted, jet grouting piles 3 constructed before caisson production arranged at the bottom and periphery of the reinforced concrete caisson 5 and jet grouting piles 6 constructed after caisson sinking, and jet grouting piles 3 constructed before caisson production arranged at the top and periphery of the old drainage pipe 1 and bottom swing jet grouting 4 of the old drainage pipe.

[0027] In this embodiment, the reinforced concrete caisson 5 is a reinforced concrete polygonal well, and the implementation can be designed as a regular or irregular polygon according to the pipeline alignment.

[0028] In this embodiment, the distance between the well wall of the reinforced concrete caisson 5 and the pipe wall of the old drainage pipe 1 is 600 mm.

[0029] In this embodiment, the distance between the jet grouting pile 3 constructed before caisson production around the reinforced concrete caisson 5 and the caisson is 600 mm.

[0030] In this embodiment, the reinforced concrete caisson 5 is reserved with an interface for connection with the old drainage pipe 1, and is blocked with lime sand bricks before caisson sinking.

[0031] In this embodiment, the jet grouting piles 3 constructed before the fabrication of the caisson around the reinforced concrete caisson 5, the jet grouting piles 6 constructed after the sinking of the caisson, and the jet grouting piles 3 constructed before the fabrication of the caisson at the top and around the old drainage pipe 1 adopt double-row jet grouting piles with an overlap of 200 mm. The elevation of the pile top is the same as that of the caisson top, and the elevation of the pile bottom is 5 m lower than the elevation of the caisson bottom. The jet grouting piles 3 constructed before the fabrication of the caisson at the bottom of the reinforced concrete caisson 5 adopt double-row jet grouting piles with an overlap of 100 mm. The elevation of the pile top is the same as that of the caisson bottom, and the elevation of the pile bottom is 3 m lower than the elevation of the caisson bottom. The pile diameter is 600 mm. The treatment range of the water-stop curtain at the old drainage pipe 1 exceeds the connection position by no less than 2 m. The water-stop curtain at the bottom of the old drainage pipe 1 adopts large-diameter MJS method piles.

[0032] In this embodiment, a caisson cover plate 7 and an inspection well opening 8 are provided on the reinforced concrete caisson 5.

[0033] The construction method of the new-old drainage pipe connection structure under the non-interception condition includes the following steps:

[0034] S1: Construct the jet grouting piles at the bottom and around the reinforced concrete caisson 5, at the top and around the old drainage pipe 1, excluding the part between the reinforced concrete caisson 5 and the old drainage pipe 1. Construction is carried out from the periphery to the middle. For parts where jet grouting piles are difficult to handle, such as the bottom of the old drainage pipe 1, large-diameter MJS method piles are used for construction;

[0035] S2: Fabricate and sink the reinforced concrete caisson 5, and connect the new drainage pipe 2 with the reinforced concrete caisson 5;

[0036] S3: Construct the jet grouting piles at the part between the reinforced concrete caisson 5 and the old drainage pipe 1. The jet grouting piles should overlap with the reinforced concrete caisson 5 and the old drainage pipe 1 by 200 mm;

[0037] S4: Demolish the lime-sand brick wall at the reserved old drainage pipe connection opening of the reinforced concrete caisson 5, and use manual labor to excavate the soil to the wall of the old drainage pipe 1;

[0038] S5: Fill the reinforced concrete caisson 5 with water until the water level in the reinforced concrete caisson 5 is flush with the water level in the old drainage pipe 1;

[0039] S6: Manually carry out underwater operations to demolish the concrete on the wall of the old drainage pipe 1 to achieve the connection between the new drainage pipe 2 and the old drainage pipe 1.

[0040] The content clarified in the above embodiments should be understood that these embodiments are only used to more clearly illustrate the present invention, rather than to limit the scope of the present invention. After reading the present invention, various equivalent forms of modification by those skilled in the art fall within the scope defined by the appended claims of this application.

Claims

1. A construction method for the connection structure of new and old drainage pipes under the condition of no interception, characterized in that: The construction method is aimed at the connection structure of new and old drainage pipes under the condition of no river closure, including a caisson set beside the old drainage pipe that needs to be connected and diverted, a water-stop curtain set at the bottom and around the caisson, and a water-stop curtain set at the top, around and at the bottom of the old drainage pipe; The specific construction steps are as follows: S1: Construct the water-stop curtain at the bottom and around the caisson and at the top and around the old drainage pipe, excluding the part between the caisson and the old drainage pipe. Construction is carried out from the periphery to the middle. For the part where the water-stop curtain at the bottom of the old drainage pipe is difficult to handle, large-diameter MJS method piles are used for construction; S2: Fabricate and sink the caisson, and connect the new drainage pipe to the caisson; S3: Construct the water-stop curtain at the part between the caisson and the old drainage pipe, and the water-stop curtain is in engagement with the caisson and the old drainage pipe; S4: Demolish the lime-sand brick wall at the reserved connection opening of the old drainage pipe in the caisson, and use manual labor to excavate the soil to the wall of the old drainage pipe; S5: Fill the caisson with water until the water level in the caisson is flush with the water level in the old drainage pipe; S6: Carry out manual underwater operation to demolish the concrete on the wall of the old drainage pipe to achieve the connection of the new and old drainage pipes.

2. The construction method of the new and old drainage pipeline connection structure under the non-interception condition according to claim 1, characterized in that: The caisson is a reinforced concrete polygonal well; the water-stop curtain at the bottom and around the caisson is a jet grouting pile water-stop curtain, the water-stop curtain at the top and around the old drainage pipe is a jet grouting pile water-stop curtain, and the water-stop curtain at the bottom of the old drainage pipe is a large-diameter MJS method pile water-stop curtain.

3. The construction method of the connection structure between the new and old drainage pipelines under the non-intercepting flow condition according to claim 1 or 2, characterized in that: The distance between the wall of the caisson and the wall of the old drainage pipe is 500mm - 800mm.

4. The construction method of the new and old drainage pipe connection structure under the non-intercepting flow condition according to claim 1 or 2, characterized in that: The distance between the water-stop curtain around the caisson and the caisson is 500mm - 800mm.

5. The construction method of the new and old drainage pipe connection structure under the non-intercepting flow condition according to claim 1 or 2, characterized in that: The caisson reserves a connection opening with the old drainage pipe, which is blocked by lime-sand bricks before the caisson sinks.

6. The construction method of the connection structure between new and old drainage pipes under the non-intercepting flow condition according to claim 1 or 2, characterized in that: The water-stop curtain around the caisson, as well as the water-stop curtain at the top and around the old drainage pipe, adopts double-row jet grouting piles with an engagement of 200 ± 20mm. The top elevation of the piles is the same as the top elevation of the caisson, and the bottom elevation of the piles is 5m lower than the bottom elevation of the caisson. The water-stop curtain at the bottom of the caisson adopts double-row jet grouting piles with an engagement of 100 ± 10mm. The top elevation of the piles is the same as the bottom elevation of the caisson, and the bottom elevation of the piles is 3m lower than the bottom elevation of the caisson. The pile diameter is 600mm - 800mm. The treatment range of the water-stop curtain at the old drainage pipe exceeds the connection position by no less than 2m. The water-stop curtain at the bottom of the old drainage pipe adopts large-diameter MJS method piles.

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