A new construction method for connecting old and new underground channels

Abstract

This invention discloses a construction method for connecting an existing and a new culvert, relating to the field of building design and drainage technology. The method includes: setting a connection point at one end of an abandoned section of the existing culvert; removing the top slab of the existing culvert at the connection point to create a top gap; lowering a temporary sealing structure through the top gap and fixing the temporary sealing structure to the side wall of the existing culvert; draining the water accumulated between the temporary sealing structure and the side wall; and removing the side wall to connect the existing culvert to the newly constructed culvert. This invention avoids water interception upstream and downstream of the existing culvert, ensuring its normal operation during construction; it also reduces the need for extensive pumping and diversion, significantly improving construction efficiency and thus lowering construction costs.

Description

Technical Field

[0001] This invention relates to the field of building design and drainage treatment technology, and in particular to a construction method for connecting old and new underground channels. Background Technology

[0002] With the rapid development of cities, the lifespan of urban groundwater pipelines is also increasing, necessitating maintenance and repair of problematic urban groundwater pipelines.

[0003] In the renovation and decommissioning of existing drainage pipelines, airbags need to be installed simultaneously on the upstream and downstream inspection wells of the decommissioned section. Then, water pumping and diversion methods should be used to maintain the normal operation of the drainage pipeline. The upstream and downstream inspection wells should be connected by a new pipeline.

[0004] However, existing drainage pipelines often have large water volumes and high flow rates and velocities in the underground channels, which makes it difficult to seal the airbags in the upstream and downstream inspection wells of the abandoned section of the drainage pipeline. The accumulated water that is pumped out has nowhere to be discharged, increasing the difficulty of abandoning the existing drainage pipeline. Summary of the Invention

[0005] The technical problem to be solved by this invention is to address the shortcomings of existing technologies, specifically the construction problems caused by the large flow and high velocity of existing culverts when abolishing drainage pipelines. Specifically, this invention provides a method for connecting old and new culverts, as detailed below:

[0006] 1) In a first aspect, the present invention provides a construction method for connecting old and new culverts, the specific technical solution of which is as follows:

[0007] S1, set a connection point at one end of the abandoned section of the existing culvert, remove the top plate of the existing culvert located at the connection point, so that the existing culvert forms a top gap;

[0008] S2, lower a temporary sealing structure from the top gap and fix the temporary sealing structure to the side wall of the existing culvert;

[0009] S3, after draining the water between the temporary sealing structure and the side wall, remove the side wall to connect the existing culvert to the newly built culvert.

[0010] Based on the above solution, the present invention can be further improved as follows.

[0011] Furthermore, when the water level in the existing culvert is lower than the top slab of the existing culvert located at the connection point, the top slab of the existing culvert located at the connection point is removed.

[0012] Furthermore, before removing the top slab of the existing culvert located at the connection point, the top slab is divided and removed sequentially according to preset conditions.

[0013] Furthermore, the top plate is cut using a wire saw.

[0014] Furthermore, the temporary sealing structure is a prism structure with missing upper and lower bottom surfaces and one side surface.

[0015] Furthermore, the bottom surface of the temporary sealing structure is connected to the bottom of the existing culvert, and the contact area is covered with a flexible rubber sealing strip.

[0016] Furthermore, the missing side of the temporary sealing structure is connected to the side wall of the existing culvert, and the contact area is covered with a flexible rubber sealing strip.

[0017] Furthermore, the angle of the water-facing side of the temporary sealing structure is adjusted so that a fixed angle is formed between the water-facing side and the side wall of the existing culvert. The lateral pressure from the water flow in the existing culvert causes the temporary sealing structure to fit against the side wall of the existing culvert.

[0018] Furthermore, the temporary sealing structure is a double-layer hollow steel structure. After the temporary sealing structure is fixed to the side wall of the existing culvert, yellow clay is filled into the temporary sealing structure.

[0019] The beneficial effects of the new and old culvert connection construction method provided by this invention are as follows:

[0020] By removing the top slab of the connection point and lowering a temporary sealing structure, a waterless environment is created only by removing the side walls of the existing culvert. Water is not intercepted upstream or downstream of the existing culvert, ensuring its normal operation during construction. This method is suitable for the renovation of large-volume underground drainage culverts, allowing for continuous operation with water throughout. It avoids the pumping difficulties inherent in traditional construction techniques due to the large flow rate and high velocity of existing culverts, reducing the need for extensive pumping and diversion measures, significantly improving construction efficiency, and thus lowering construction costs. Attached Figure Description

[0021] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of an existing culvert and a newly built culvert according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of the foundation pit of a newly constructed underground culvert according to an embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional schematic diagram of the connection between the old and new underground channels according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the removal of the top slab according to an embodiment of the present invention;

[0026] Figure 5 This is a top view schematic diagram of a temporary sealing method according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic cross-sectional view of a temporary sealing section according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram showing the dimensions of the side wall removed at the connection point in an embodiment of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0030] Figure 1 This is a structural diagram of an existing culvert and a newly constructed culvert. The existing culvert has multiple leaks, and the sewage in its combined sewer lines can pollute the surrounding land and water sources. Therefore, it is necessary to connect the newly constructed sewage culvert to the upstream and downstream sections of the abandoned section of the existing culvert (e.g., Figure 1 As shown, the existing abandoned section of the culvert is connected at connection point A and connection point B to complete the construction of the abandoned section of the existing culvert.

[0031] Figure 2 This is a schematic diagram of the cross-section of the foundation pit for the new culvert (unit: mm). Figure 2 As shown, 7400 represents the width of the foundation pit; 4200 refers to the outer width of the newly built culvert; 3300 refers to the height of the main body of the newly built culvert; 3400 refers to the net width inside the newly built culvert; and 2500 refers to the net height inside the newly built culvert. Figure 2 In the diagram, the 4200×3300 frame represents the external dimensions of the newly built culvert (i.e., the external width and main height of the newly built culvert); 3400×2500 refers to the internal dimensions of the newly built culvert (i.e., the internal net width and internal net height of the newly built culvert).

[0032] Figure 3 This is a cross-sectional schematic diagram of the connection between the new and old underground channels (unit: m). In this embodiment, the reserved hole of the inspection well of the new underground channel is at the same height as the interior of the new underground channel and the existing underground channel. The reserved hole is mainly to ensure that it is the same size as the existing underground channel, so as to avoid the contact surface (side wall) of the new and old underground channels being too small and causing leakage.

[0033] An embodiment of the present invention provides a construction method for connecting old and new culverts, comprising the following steps:

[0034] S1. Construct a new sewage culvert with an inner diameter of 3.4m × 2.5m at one end of the existing culvert (i.e., construct a new culvert; please refer to the dimensions). Figure 2 The location where the existing culvert connects to the newly built culvert is the connection point (corresponding to...). Figure 1The connection point A or connection point B is shown in the schematic diagram of the cross-section of the connection point. Figure 3 The existing culvert and the newly constructed culvert are separated by a side wall. When the water level in the existing culvert is lower than the top slab of the existing culvert located at the connection point, the top slab of the existing culvert is removed. The removal process is as follows:

[0035] S101, the roof slab is cut 5.5 meters on its long side using a wire saw. Figure 4 As shown, the top plate is divided into three sections: numbered 1, 2, and 3.

[0036] S102, and then cut the top plate 3.4 meters short side in sequence according to the serial number.

[0037] S103, the cut top plate is lifted by a 50t crane. The weight of each cut top plate is calculated to be ≤6t, which is within the range of the crane's operation.

[0038] S2, After the top slab is removed, a gap is created at the top of the existing culvert. A temporary sealing structure is then lowered through this gap and fixed to the side wall of the existing culvert, such as... Figure 5 as well as Figure 6 As shown, Figure 5 This is an overhead view of the temporary blockade. Figure 6 This is a schematic diagram of the temporary sealing section. From... Figure 5 as well as Figure 6 As can be seen, the temporary sealing structure is roughly a prism structure missing its top and bottom surfaces and one side. Furthermore, the temporary sealing structure is a double-layered hollow steel structure. The specific process is as follows:

[0039] S201, lower the temporary sealing structure through the top gap and fix it in place, anchoring the temporary sealing structure to the top slab (note that in this embodiment, the "top slab to which the temporary sealing structure is anchored" refers to the existing culvert top slab that was not removed in S1, as well as the top slab of the newly built culvert at the junction with the existing culvert, the same below). Please continue reading. Figure 5 It can be seen that the length of the temporary sealing structure is the same as the length of the removed top slab. Therefore, the top slab can be used to fix the temporary sealing structure, making it anchored to the existing culvert top slab, which can prevent the temporary sealing structure from loosening and slipping or other accidents.

[0040] S202, the bottom surface of the temporary sealing structure connects to the bottom of the existing culvert, and the missing side of the temporary sealing structure connects to the side wall of the existing culvert, creating an independent space between the temporary sealing structure and the side wall of the existing culvert. The contact areas between the temporary sealing structure and the bottom and side wall of the existing culvert are covered with flexible rubber sealing strips.

[0041] S203, fill the hollow space inside the temporary sealing structure with yellow clay with low permeability (it should be noted that the hollow space here refers to the double-layer hollow part of the temporary sealing structure, not the independent space formed by the temporary sealing structure and the existing culvert sidewall), so that there is no large amount of water seepage in the independent space formed by the temporary sealing structure and the existing culvert sidewall during the operation.

[0042] Preferably, when setting up a temporary sealing structure, the angle of the water-facing side of the temporary sealing structure can be adjusted so that a fixed angle is formed between the water-facing side and the sidewall of the existing culvert (please continue reading). Figure 5 In this embodiment, the temporary sealing structure is lowered and reinforced at the junction of the new and old culverts (the newly built culvert and the existing culvert) at a low water level. The main purpose is to facilitate the removal of the sidewall at the junction. During this process, the water-facing surface of the temporary sealing structure is set at a 45-degree angle (corresponding to...). Figure 5 The 45° angle can greatly reduce the impact pressure of the water flow and ensure that the temporary sealing structure fits tightly with the side wall structure of the existing culvert through the lateral pressure from the water flow in the existing culvert.

[0043] S3. After draining the water accumulated between the temporary sealing structure and the side wall, the side wall is removed to connect the existing culvert to the newly built culvert. The process is as follows:

[0044] S301 involves pumping out the accumulated water within the independent space formed by the temporary sealing structure and the existing culvert sidewall, and then pumping the water into the existing culvert. The advantage of this approach is that it avoids the difficulties in pumping out large amounts of wastewater and the limited space for wastewater storage encountered in traditional interception sealing construction methods.

[0045] S302, After the accumulated water is drained, remove the side wall (corresponding to...). Figure 5 The network structure in Figure 6 (The mesh structure in the middle). The demolition process of the side wall is as follows: The side wall is demolished using a wire saw. First, the long side is cut at 3.4 meters, and then the short side is cut at 2.5 meters in sequence according to the number (e.g., Figure 7 As shown, Figure 7 (Diagram showing the dimensions of the side wall to be removed at the connection point) The side wall blocks were lifted one by one using a 50t crane (the maximum weight of the side wall block was calculated to be ≤3.5t).

[0046] After the side wall between the existing culvert and the new culvert is demolished, the new culvert is connected, and the water accumulated in the existing culvert flows into the new culvert, allowing the new culvert to replace the existing culvert in its function.

[0047] The process dimensional parameters involved in this embodiment are as follows:

[0048] (1) The existing culvert has an inner diameter of 3.4m × 2.5m and a wall thickness of 0.4m;

[0049] (2) Remove the cover plate, which measures 5.5m × 3.4m and has a thickness of 0.4m;

[0050] (3) The side wall with dimensions of 3.4m × 2.5m and thickness of 0.4m was demolished.

[0051] The mechanical parameters are as follows:

[0052] 150t crane, 55kw sewage pump, 27kw wire saw, 200kw generator.

[0053] The construction technique described in this embodiment is applicable to the renovation of large-volume underground drainage culverts. Existing large-volume drainage culverts require route adjustments, with existing sections being abandoned. A new drainage line is then connected to the existing one, and the entire process is carried out while the culvert is submerged, ensuring normal operation. This technique has been successfully implemented for connecting old and new sewage culverts with a width × thickness (3.4m × 2.5m) and a thickness of 0.4m. It solves the technical challenges of connecting old and new pipelines in large-volume underground drainage culverts. By addressing the limitation of flow rate and velocity in large-volume drainage culverts that preclude pumping and diversion, the new culvert line is connected to the existing one, and the entire process is carried out while the pipeline is submerged, ensuring normal operation and reducing the need for extensive pumping and diversion measures, thus significantly lowering construction costs.

[0054] The beneficial effects of this invention are as follows:

[0055] By removing the top slab of the connection point and lowering a temporary sealing structure, a waterless environment is created only by removing the side walls of the existing culvert. Water is not intercepted upstream or downstream of the existing culvert, ensuring its normal operation during construction. The entire process is carried out with water, avoiding the pumping difficulties inherent in traditional construction methods due to the large flow rate and high velocity of the existing culvert. This reduces the need for extensive pumping and diversion measures, significantly improving construction efficiency and thus lowering construction costs.

[0056] In the above embodiments, although the steps are numbered S1, S2, etc., they are only specific embodiments given by the present invention. Those skilled in the art can adjust the execution order of S1, S2, etc. according to the actual situation, which is also within the protection scope of the present invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A construction method for connecting old and new culverts, characterized in that, include: S1, set a connection point at one end of the abandoned section of the existing culvert, remove the top plate of the existing culvert located at the connection point, so that the existing culvert forms a top gap; S2, lower a temporary sealing structure from the top gap and fix the temporary sealing structure to the side wall of the existing culvert; S3, after draining the water between the temporary sealing structure and the side wall, remove the side wall to connect the existing culvert to the newly built culvert; The temporary sealing structure is a prism structure with missing top and bottom surfaces and one side surface; Adjust the angle of the water-facing side of the temporary sealing structure so that a fixed angle is formed between the water-facing side and the side wall of the existing culvert. The lateral pressure from the water flow in the existing culvert makes the temporary sealing structure fit against the side wall of the existing culvert. The temporary sealing structure is a double-layer hollow steel structure. After the temporary sealing structure is fixed to the side wall of the existing culvert, yellow clay is filled into the temporary sealing structure.

2. The construction method for connecting old and new culverts according to claim 1, characterized in that, When the water level in the existing culvert is lower than the top slab of the existing culvert located at the connection point, the top slab of the existing culvert located at the connection point shall be removed.

3. The construction method for connecting old and new culverts according to claim 1, characterized in that, Before removing the top slab of the existing culvert located at the connection point, the top slab is divided and removed sequentially according to preset conditions.

4. The construction method for connecting old and new culverts according to claim 3, characterized in that, The top plate is cut using a wire saw.

5. The construction method for connecting old and new culverts according to claim 1, characterized in that, The bottom surface of the temporary sealing structure is connected to the bottom of the existing culvert, and the contact area is covered with a flexible rubber sealing strip.

6. The construction method for connecting old and new culverts according to claim 1, characterized in that, The missing side of the temporary sealing structure connects to the side wall of the existing culvert, and the contact area is covered with a flexible rubber sealing strip.

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