Inverted siphon well rainwater box culvert and construction method thereof

Abstract

According to the inverted siphon well rainwater box culvert and the construction method thereof, the inverted siphon well rainwater box culvert comprises a box culvert body and an inverted siphon well, and the inverted siphon well comprises a pair of wellbores and a communicating pipeline; the pair of shafts comprises a pair of first prefabricated sections and a pair of second prefabricated sections, the first prefabricated sections are arranged on the two opposite sides of the box culvert body, the first prefabricated sections and the box culvert body form an integrated prefabricated structure, the second prefabricated sections are fixedly communicated with the lower portions of the first prefabricated sections correspondingly, and the first prefabricated sections are communicated with two fractures of an existing sewage pipeline correspondingly; the communicating pipeline is located below the box culvert body and communicates between the pair of second prefabricated sections. According to the inverted siphon well rainwater box culvert and the construction method thereof, the construction period is shortened, meanwhile, the second prefabricated section can provide stable support for the first prefabricated section, the stability of the shaft structure is guaranteed, through integrated arrangement of the box culvert wall and the shaft wall, the width of the whole structure is reduced as much as possible, and the influence on road traffic is reduced.

Description

Technical Field

[0001] This invention belongs to the field of inverted siphon construction, specifically relating to an inverted siphon rainwater box culvert and its construction method. Background Technology

[0002] When constructing stormwater culverts during urban road excavation, there may be a conflict between the newly built culvert 4 and the existing sewage pipe 3. To prevent the existing sewage pipe 3 from directly passing through the culvert 4 and to ensure that the cross-sectional area of ​​the culvert 4 is not affected, the existing sewage pipe 3 can be bypassed by setting up an inverted siphon 1 (e.g., Figure 1 , Figure 2 (As shown). There are two traditional methods for constructing an inverted siphon 1. One method involves excavating first, then constructing the inverted siphon 1, backfilling to the bottom elevation of the box culvert 4, and finally constructing the box culvert 4. This method requires a larger excavation width to ensure sufficient working space during the construction of the box culvert 4, significantly impacting road traffic. Furthermore, since the inverted siphon 1 needs to bypass the box culvert 4 from below, it must strictly adhere to the sequence of backfilling the inverted siphon before constructing the box culvert, resulting in a longer construction period. The second method involves first pouring the box culvert 4 and completing the backfilling, then using a pipe jacking machine 5 to jack the pipes at the bottom of the box culvert, and finally pouring the inverted siphon (as shown). Figure 3 As shown in the figure, this construction method can reduce the width of the excavation required at the same time to a certain extent and reduce the impact on road traffic. However, pipe jacking construction is difficult, has high requirements for technology and machinery, and is limited by natural factors such as geological conditions. Summary of the Invention

[0003] This invention discloses an inverted siphon stormwater culvert and its construction method. While shortening the construction period, it first constructs the second precast section and ensures the stability of the second precast section before constructing the first precast section. This allows the second precast section to provide stable support for the first precast section, ensuring the stability of the culvert structure. Furthermore, the integrated design of the culvert body and the first precast section avoids gaps between the culvert body and the culvert body, minimizing the width of the overall structure, reducing the excavation area of ​​the foundation pit, and reducing the impact on road traffic.

[0004] This invention discloses an inverted siphon stormwater culvert, comprising a culvert body that intersects with an existing sewage pipeline and an inverted siphon for cutting off and guiding the existing sewage pipeline around the culvert body. The inverted siphon includes a pair of shafts and a connecting pipe. The pair of shafts includes a pair of first prefabricated sections located on opposite sides of the culvert body and forming an integrated prefabricated structure with the culvert body, and a pair of second prefabricated sections respectively connected and fixed below the pair of first prefabricated sections. The pair of first prefabricated sections are respectively connected to two breaks in the existing sewage pipeline, and the connecting pipe is located below the culvert body and connects between the pair of second prefabricated sections.

[0005] A further improvement of the present invention is that it also includes a cushion layer placed between the second precast section and the bottom surface of the foundation pit.

[0006] A further improvement of the present invention is that it also includes a pipe seat fixed to the bottom of the pit and used to support the connecting pipe.

[0007] A further improvement of the present invention is that the top surface of the first prefabricated section is at the same elevation as the top surface of the box culvert body, and the pair of well shafts further includes a pair of third prefabricated sections respectively connected and fixed above the pair of first prefabricated sections.

[0008] The present invention discloses a construction method for an inverted siphon stormwater box culvert, comprising the following steps; S1. Excavate a foundation pit at the construction site and cut off the existing sewage pipes in the foundation pit that conflict with the position of the box culvert body. S2. Hoist a pair of the second prefabricated sections and place the pair of the second prefabricated sections at the bottom of the foundation pit; S3. Backfill soil around a pair of second precast sections and in the gap between a pair of second precast sections. During the backfilling process, connect the connecting pipe between a pair of second precast sections. S4. Hoist the integrated prefabricated structure and connect a pair of first prefabricated sections above a pair of second prefabricated sections to form a pair of well shafts; S5. Connect the pair of well shafts to the two breaks in the existing sewage pipe, and backfill the foundation pit.

[0009] A further improvement of the present invention is that a pipe seat is provided for supporting the connecting pipe. Before performing step S3, the pipe seat is fixed to the bottom of the pit and located between a pair of second prefabricated sections. When connecting the connecting pipe between the pair of second prefabricated sections, the connecting pipe is first placed above the pipe seat, and then connected between the pair of second prefabricated sections with the support of the pipe seat.

[0010] A further improvement of the present invention is that, in step S4, after the pair of the first prefabricated segments and the pair of the second prefabricated segments are joined together, water-stopping treatment is performed at the joint, and cement mortar is used to fill and grout the joint.

[0011] A further improvement of the present invention is that, after performing step S1 and before performing step S2, foundation pit support is constructed around the foundation pit.

[0012] A further improvement of the present invention is that, after performing step S4 and forming a pair of well shafts, the settlement of the foundation pit is continuously monitored, and step S5 is performed only after the settlement is confirmed to be stable.

[0013] A further improvement of the present invention is that, when performing step S5 and further backfilling the foundation pit, the backfill is carried out in layers, and the compaction degree of each layer of backfill soil is checked during the layered backfilling process.

[0014] This invention shortens the construction period by constructing the second precast section first and ensuring its structural stability before constructing the first precast section. This allows the second precast section to provide stable support for the first precast section, ensuring the stability of the shaft structure. Furthermore, the integrated design of the box culvert body and the first precast section avoids gaps between the shaft and the box culvert body, minimizing the width of the overall structure, reducing the excavation area of ​​the foundation pit, and reducing the impact on road traffic. Attached Figure Description

[0015] Figures 1-2 This is a schematic diagram of the first approach in the background technology; Figure 3 This is a schematic diagram of the second approach in the background technology; Figure 4 This is a schematic diagram of the prefabricated structure of the present invention; Figure 5 This is a cross-sectional view of the foundation pit excavation for this invention; Figure 6 This is a top view of the foundation pit of the present invention; Figure 7 This is a schematic diagram of the construction of the second prefabricated section of the present invention; Figure 8 This is a schematic diagram of the construction of the concrete seat cushion of the present invention; Figure 9 This is a schematic diagram of the installation of the connecting pipe of the present invention; Figure 10 This is a schematic diagram of the installation of the first prefabricated section of the present invention; Figure 11 This is a schematic diagram of the installation of the third prefabricated section of the present invention; Figure 12 Schematic diagram for connecting existing sewage pipes; Figure 13 This is a top view of the inverted siphon well after installation according to the present invention; In the diagram: 1. Inverted siphon; 2. Connecting pipe; 3. Existing sewage pipe; 4. Box culvert; 5. Pipe jacking machinery; 61. Steel sheet pile; 62. Steel waler; 63. Steel support; 7. Shaft; 71. Second precast section; 721. First precast section; 722. Third precast section; 8. Pipe seat; 9. Subbase; 10. Backfill soil; 11. Box culvert body. Detailed Implementation

[0016] like Figures 4-13As shown, the present invention discloses a prefabricated integrated inverted siphon stormwater culvert, comprising a culvert body 11 that intersects with an existing sewage pipe 3 and an inverted siphon for cutting off and guiding the existing sewage pipe 3 around the culvert body 11. The inverted siphon includes a pair of shafts and a connecting pipe 2. The pair of shafts 7 includes a pair of first prefabricated sections 721 located on opposite sides of the culvert body 11 and forming an integrated prefabricated structure with the culvert body 11, and a pair of second prefabricated sections 71 respectively connected and fixed below the pair of first prefabricated sections 721. The pair of first prefabricated sections 721 are respectively connected to two breaks in the existing sewage pipe 3. The connecting pipe 2 is located below the culvert body 11 and connects between the pair of second prefabricated sections 71.

[0017] The box culvert body 11 and the inverted siphon together form an integrated prefabricated structure to ensure that the box culvert body 11 is tightly attached to the shaft of the inverted siphon, so as to minimize the width of the overall structure and thus reduce the impact of construction on the road.

[0018] Preferably, in this embodiment, a pair of second prefabricated sections 71 and a pair of first prefabricated sections 721 are each fixed with lifting rings for lifting by a truck crane.

[0019] like Figure 8 As shown, it also includes a cushion layer 9 placed between the second precast section and the bottom of the foundation pit. By setting the cushion layer 9, the impact of the inverted siphon on the settlement of the bottom of the foundation pit is further reduced, and the stability of the inverted siphon is enhanced.

[0020] like Figure 8 As shown, it also includes a pipe seat 8 fixed to the bottom of the pit, located between a pair of second prefabricated sections 71 and supporting the bottom of the connecting pipe 2.

[0021] like Figure 11 As shown, the top surface of the first precast section 721 is at the same elevation as the top surface of the box culvert body 11. The pair of shafts also include a pair of third precast sections 722 that are respectively connected to and fixed above the pair of first precast sections 721. By setting the third precast sections 722, the inverted siphon is further segmented, reducing its load on the bottom of the foundation pit.

[0022] Preferably, in this embodiment, the connection points of the first prefabricated segment 721, the second prefabricated segment 71, and the third prefabricated segment 722 are all provided with mutually compatible card interfaces. The first prefabricated segment 721, the second prefabricated segment 71, and the third prefabricated segment 722 are connected to each other through the card interfaces, and the two are fixed after connection.

[0023] The present invention discloses a construction method for a prefabricated integrated inverted siphon stormwater culvert, comprising the following steps; like Figure 5 , Figure 6As shown, S1, excavate the foundation pit at the construction site and cut off the existing sewage pipe 3 that conflicts with the position of the box culvert body 11 in the foundation pit. like Figure 7 As shown, S2, hoist a pair of second prefabricated sections 71 and place the pair of second prefabricated sections 71 at the bottom of the foundation pit; like Figure 8 As shown, S3, backfill soil 10 is backfilled around a pair of second prefabricated sections 71 and in the gap between the pair of second prefabricated sections 71, and during the backfilling process, the connecting pipe 2 is connected between the pair of second prefabricated sections 71. like Figure 10 , Figure 11 As shown, S4, hoist a pair of first prefabricated sections 72 and a prefabricated culvert 11 integrated with the first prefabricated sections 72, connect the pair of first prefabricated sections 72 above a pair of second prefabricated sections 71, and connect the pair of first prefabricated sections 72 and the pair of second prefabricated sections 71 to form a pair of well shafts 7; like Figure 13 As shown, S5 connects a pair of well shafts 7 to the existing sewage pipe and further backfills the foundation pit.

[0024] like Figure 8 As shown, a pipe seat 8 is also provided to provide support for the connecting pipe 2. Before backfilling in step S3, the pipe seat 8 is fixed to the bottom of the pit and located between a pair of second prefabricated sections 71. When connecting the connecting pipe 2 between the pair of second prefabricated sections 71, the connecting pipe 2 is first placed on top of the pipe seat 8, and then connected between the pair of second prefabricated sections 71 with the support of the pipe seat 8.

[0025] Preferably, in this embodiment, before constructing the second precast section 71, a cushion layer 9 is laid at the bottom of the foundation pit, below the second precast section 71, to further reduce the settlement at the bottom of the foundation pit caused by the construction of the well shaft.

[0026] Preferably, in this embodiment, after the pair of first precast sections 72 and the pair of second precast sections 71 are joined together, water-stopping treatment is performed at the joint, and cement mortar is used to fill and grout the joint.

[0027] Preferably, in this embodiment, before connecting the connecting pipe 2 to a pair of second prefabricated sections 71 in step S3, the connecting pipe 2 is first subjected to anti-corrosion treatment.

[0028] Preferably, after performing step S1 and before performing step S2, the foundation pit support is constructed around the foundation pit.

[0029] In this embodiment, the foundation pit support includes sheet piles 61, steel walers 62, and steel supports 63. During the construction of the foundation pit support, sheet piles 61 are driven into the perimeter of the foundation pit, and steel walers 62 are fixedly installed on the sheet piles 61. Multiple steel supports 63 spanning the foundation pit are fixed between the steel walers 62. Before backfilling the foundation pit, the above-mentioned foundation pit support is removed.

[0030] Preferably, in this embodiment, after forming a pair of well shafts 7 in step S4, the settlement of the foundation pit is continuously monitored, and step S5 is executed only after the settlement is confirmed to be stable.

[0031] Preferably, in this embodiment, after connecting the pair of well shafts 7 to the existing sewage pipe 3 in step S5, a rubber ring is used to seal the connection between the pair of well shafts 7 and the existing sewage pipe 3.

[0032] Preferably, the backfilling of the foundation pit is carried out in layers during step S5, and the compaction degree of each layer of backfill soil is checked during the layer backfilling process.

[0033] Preferably, the wellbore 7 in this embodiment adopts a rectangular well structure.

[0034] Preferably, in this embodiment, before cutting off the existing sewage pipe 3, the existing sewage pipe 3 is temporarily diverted to avoid affecting normal sewage discharge after cutting off the existing sewage pipe 3.

[0035] Preferably, the road surface above the foundation pit is repaired after the foundation pit is backfilled.

[0036] In this embodiment, the first prefabricated section 72 is connected to a prefabricated pipe for connecting to the existing sewage pipe 3.

[0037] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A siphon-type stormwater culvert, comprising a culvert body intersecting with an existing sewage pipeline and an inverted siphon for cutting off and guiding the existing sewage pipeline around the culvert body, characterized in that, The inverted siphon includes a pair of shafts and a connecting pipe. The pair of shafts includes a pair of first prefabricated sections located on opposite sides of the box culvert body and forming an integrated prefabricated structure with the box culvert body, and a pair of second prefabricated sections respectively connected and fixed below the pair of first prefabricated sections. The pair of first prefabricated sections are respectively connected to two breaks in the existing sewage pipe. The connecting pipe is located below the box culvert body and connects between the pair of second prefabricated sections.

2. The inverted siphon rainwater culvert as described in claim 1, characterized in that, It also includes a cushion layer placed between the second precast section and the bottom of the foundation pit.

3. The inverted siphon rainwater culvert as described in claim 1, characterized in that, It also includes a pipe seat fixed to the bottom of the pit and used to support the connecting pipe.

4. The inverted siphon rainwater culvert as described in claim 1, characterized in that, The top surface of the first precast section is at the same elevation as the top surface of the box culvert body, and the pair of shafts also include a pair of third precast sections that are respectively connected to and fixed above the pair of first precast sections.

5. A construction method for an inverted siphon stormwater culvert as described in claim 1, characterized in that, Includes the following steps; S1. Excavate a foundation pit at the construction site and cut off the existing sewage pipes in the foundation pit that conflict with the position of the box culvert body. S2. Hoist a pair of the second prefabricated sections and place the pair of the second prefabricated sections at the bottom of the foundation pit; S3. Backfill soil around a pair of second precast sections and in the gap between a pair of second precast sections. During the backfilling process, connect the connecting pipe between a pair of second precast sections. S4. Hoist the integrated prefabricated structure and connect a pair of first prefabricated sections above a pair of second prefabricated sections to form a pair of well shafts; S5. Connect the pair of well shafts to the two breaks in the existing sewage pipe, and further backfill the foundation pit.

6. The construction method of the inverted siphon rainwater box culvert as described in claim 5, characterized in that, A pipe seat is also provided for supporting the connecting pipe. Before performing step S3, the pipe seat is fixed to the bottom of the pit and located between a pair of second prefabricated sections. When connecting the connecting pipe between the pair of second prefabricated sections, the connecting pipe is first placed above the pipe seat, and then connected between the pair of second prefabricated sections with the support of the pipe seat.

7. The construction method of the inverted siphon rainwater box culvert as described in claim 5, characterized in that, In step S4, after connecting a pair of the first prefabricated segments and a pair of the second prefabricated segments, water-stopping treatment is performed at the joint, and cement mortar is used to fill and grout the joint.

8. The construction method of the inverted siphon rainwater box culvert as described in claim 5, characterized in that, After performing step S1 and before performing step S2, construct foundation pit support around the foundation pit.

9. The construction method of the inverted siphon rainwater box culvert as described in claim 5, characterized in that, After performing step S4 and forming a pair of well shafts, the settlement of the foundation pit is continuously monitored, and step S5 is performed only after the settlement is confirmed to be stable.

10. The construction method of the inverted siphon rainwater box culvert as described in claim 5, characterized in that, When performing step S5 and further backfilling the foundation pit, backfilling is carried out in layers, and the compaction degree of each layer of backfill soil is checked during the layer backfilling process.

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