A construction method for extending a culvert

Abstract

This invention relates to the field of culvert construction technology, specifically to a method for extending a culvert, comprising the following steps: constructing a retaining wall in the downstream river channel; installing an aqueduct between the retaining wall and the existing culvert; the aqueduct has an inlet and an outlet at both ends, the shape and size of the inlet matching the shape and size of the corresponding position of the cross-section of the existing culvert; the outlet is installed on the retaining wall; the width of the aqueduct is 0.5 to 0.8 times the inner contour width of the culvert to be built; a predetermined distance is maintained between the bottom surface of the aqueduct and the bottom plate of the culvert to be built; clearing accumulated water from the outside of the aqueduct; sealing the gap between the inlet and the inner wall of the existing culvert; constructing the culvert to be built at the end of the existing culvert closer to the downstream river channel; after the culvert to be built is completed, dismantling the aqueduct to complete the extension of the culvert. This invention can shorten the entire culvert extension construction cycle and save construction costs.

Description

Technical Field

[0001] This invention relates to the field of culvert construction technology, and in particular to a method for extending a culvert. Background Technology

[0002] Culverts, as crucial underground or semi-underground structures, primarily function to guide water flow smoothly through various obstacles, such as roads and railways. Before road widening projects, it is usually necessary to extend existing culverts. Currently, the commonly used traditional construction method in the industry is as follows: first, the water flow inside the culvert is intercepted, then the water flow is temporarily diverted to create a waterless working environment in the extension area, allowing for culvert extension construction. Once the extension is complete, the water flow is then diverted back into the culvert.

[0003] However, the aforementioned traditional construction method requires two detours, resulting in a lengthy construction period and high construction costs. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems existing in the prior art where the construction of extended culverts requires two detours, resulting in a lengthy construction period and high construction costs. Therefore, this invention provides a construction method for extending culverts.

[0005] This invention provides a construction method for extending a culvert, comprising the following steps:

[0006] S1: Construct a water-retaining sill in the downstream river channel, and install an aqueduct between the water-retaining sill and the existing culvert, so that the water in the existing culvert flows through the aqueduct to the downstream river channel; the two ends of the aqueduct are respectively connected to a water inlet and a water outlet, the shape and size of the water inlet are adapted to the shape and size of the corresponding position of the cross-section of the existing culvert, the water outlet is installed on the water-retaining sill, the width of the aqueduct is 0.5 times to 0.8 times the inner contour width of the culvert to be built, and the bottom surface of the aqueduct maintains a predetermined distance from the bottom plate of the culvert to be built; S2: Clean up the accumulated water on the outside of the aqueduct and seal the gap between the water inlet and the inner wall of the existing culvert; S3: Construct the new culvert at one end of the existing culvert near the downstream river channel. After the new culvert is completed, dismantle the aqueduct and complete the extension construction of the water-passing culvert.

[0007] The inlet includes a bottom panel and two side panels, with the two side panels located on opposite sides of the bottom panel. The shape and size of the inlet are adapted to the shape and size of the corresponding position of the cross-section of the existing culvert. Specifically, the width of the inlet is consistent with the width of the inner contour of the existing culvert, the bottom panel of the inlet can fit against the bottom plate of the existing culvert, and the two side panels of the inlet can respectively fit against the two side walls of the inner contour of the existing culvert.

[0008] This invention provides a construction method for extending a culvert. The water-retaining sill is used to prevent backflow of water from the downstream river channel and to support the outlet of the aqueduct. The aqueduct guides the water flow from the existing culvert to the downstream river channel. Accumulated water on the outside of the aqueduct is cleared to reduce water accumulation in the area of ​​the culvert to be built, preventing water from affecting its construction. The shape and size of the water inlet are adapted to the shape and size of the corresponding position of the cross-section of the existing culvert. This design aims to ensure that all water flow from the existing culvert can be smoothly diverted to the aqueduct through the water inlet, preventing water overflow into the working area of ​​the culvert to be built. The width of the aqueduct is 0.5 to 0.8 times the inner contour width of the culvert to be built. This design aims to ensure sufficient operating space is reserved between the aqueduct and the sidewall of the culvert to facilitate related operations by construction personnel, such as rebar tying and formwork construction. The bottom surface of the aqueduct maintains a predetermined distance from the bottom slab of the culvert to be built. This design aims to ensure that operational space is reserved between the aqueduct and the bottom slab of the culvert to be built, allowing for construction of the culvert's bottom slab. Sealing the gap between the water inlet and the inner wall of the existing culvert enhances the sealing performance between them. Effective sealing measures significantly reduce water flow into the construction area of ​​the culvert to be built due to leakage, preventing excessive water flow from affecting the construction progress and quality of the culvert and ensuring the smooth progress of the entire project.

[0009] This invention provides a construction method for extending a culvert. The method guides the water flow in the existing culvert to the downstream river channel through the aqueduct, thereby providing a working environment for the culvert to be built. Unlike traditional methods, it eliminates the need for two diversion measures, thus shortening the construction cycle of the entire culvert extension and saving construction costs.

[0010] For the gap between the water inlet and the inner wall of the existing culvert, quick-drying cement can be used for filling and sealing, or rubber strips can be used for caulking and sealing.

[0011] Preferably, in step S2, the gap between the water inlet and the inner wall of the existing culvert is sealed with a rubber strip.

[0012] In this solution, both the water inlet and the inner wall of the existing culvert have good rigidity. Based on this characteristic, rubber strips are used to seal the connection between the water inlet and the inner wall of the existing culvert. The rubber strips have good flexibility and sealing properties, which can better fit the gap between the water inlet and the inner wall of the existing culvert, effectively preventing leakage.

[0013] The water-retaining embankment can be constructed using solid brick masonry or by stacking sandbags.

[0014] Preferably, in step S1, sandbags are used to form the retaining wall. Compared with building with solid bricks, the sandbag stacking method has higher construction efficiency. Specifically, sandbags can be quickly filled and stacked to form the retaining wall, eliminating the need for individual bricklaying and mortar application like with solid bricks, and also eliminating concerns about the impact of water flow on the mortar, thereby shortening the construction cycle and improving the construction quality of the retaining wall.

[0015] Preferably, in step S1, before installing the aqueduct, the riverbed in the area where the culvert to be built is to be constructed is cleaned and repaired to meet the construction requirements of the culvert to be built.

[0016] The construction area for the proposed culvert is located in the downstream river channel, near the existing culvert. The riverbed in this area may have a height that does not meet the requirements; being too high or too low would prevent the culvert from meeting the construction standards. In view of the above, this project involves clearing and repairing the riverbed in this specific area to ensure it meets the construction requirements of the proposed culvert, laying the foundation for the smooth progress of subsequent construction.

[0017] The cleaning and restoration of the riverbed can be carried out manually or by excavator.

[0018] Preferably, in step S1, an excavator equipped with a cutter suction pump and an excavator with a bucket are used to clean and trim the riverbed. Compared to manual labor, using an excavator with a cutter suction pump and an excavator with a bucket can improve the efficiency of cleaning and trimming the riverbed.

[0019] Excavators equipped with cutter suction pumps, with their strong suction and cutting force, can precisely cut uneven, hard areas on the riverbed bottom, breaking up and sucking away excess mud, sand, and rocks, efficiently smoothing the riverbed to the designed flatness. Excavators with buckets, relying on their flexible robotic arms and sturdy buckets, can precisely fill low-lying areas of the riverbed as needed, filling in suitable soil or rocks and compacting them to ensure quality. Together, these two types of excavators can efficiently complete riverbed cleaning and restoration.

[0020] The aqueduct can have a U-shaped cross section, made of rolled steel plates, with a semi-circular arc plate at the bottom and straight wall plates on both sides; or it can have a rectangular cross section, with the trough body welded from steel plates, and stiffening ribs at the top and bottom to enhance structural stability.

[0021] Preferably, the aqueduct includes a bottom plate and two side plates, which are respectively connected to both sides of the bottom plate. The bottom surface of the bottom plate and the outer sides of the two side plates are connected to main keels. The length direction of the main keels is consistent with the length direction of the aqueduct. Back ribs are provided on the main keels on the outer sides of the two side plates, and tie rods are provided between the back ribs on the outer sides of the two side plates.

[0022] In this design, the bottom plate and the two side plates form the body of the aqueduct. The main keel reinforces the bottom plate and side plates, significantly enhancing their resistance to deformation. The back ribs cooperate with the tie rods to further limit the lateral deformation of the side plates, thereby ensuring the safety and reliability of the overall aqueduct structure.

[0023] Preferably, the upstream river channel is intercepted before step S1, and the interception facilities are removed after step S2 is completed. Excessive water flow can adversely affect the construction of the retaining wall and the installation of the aqueduct. Therefore, this solution involves intercepting the upstream river channel. By setting up interception facilities, the water flow is temporarily blocked, effectively reducing the water flow in the existing culvert and the downstream river channel. This significantly improves the water flow conditions in the construction area, reducing the water velocity and volume, ensuring the smooth construction and installation of the retaining wall and the aqueduct.

[0024] Preferably, in step S1, before installing the aqueduct, support piers are constructed in the area of ​​the aqueduct. These support piers are used to support the bottom of the aqueduct. In this scheme, the support piers are used to support the aqueduct. When the span of the aqueduct is long, due to its own weight and the water flow load it bears, the mid-span area is prone to large deflection deformation, affecting the safety and stability of the structure. The installation of the support piers can provide effective support for the mid-span area of ​​the aqueduct, reduce the deflection deformation of the aqueduct, and thus ensure the structural safety and performance stability of the aqueduct during operation.

[0025] Preferably, in step S3, constructing the culvert to be built includes the following steps: S31: Construction of the foundation and bottom slab of the culvert to be built; S32: Reinforcing steel is tied and formwork is erected for the side walls and top slab of the culvert to be built, and finally the concrete pouring operation is completed.

[0026] Preferably, in step S2, after clearing the accumulated water outside the aqueduct, a water collection pit is excavated in the area outside the aqueduct, and a water pump is installed in the water collection pit to continuously drain the accumulated water.

[0027] In this scheme, the water collection pit is set up and a water pump is installed to carry out water pumping operations. This can effectively remove the water that is constantly generated and collected in the construction area of ​​the culvert to be built, thereby avoiding the adverse effects of water accumulation on the construction site, such as soaking and softening. This reduces the adverse interference of water accumulation on the construction progress, construction quality and construction safety of the culvert to be built, and ensures that the construction can be carried out smoothly and efficiently.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a construction method for extending a culvert. The method guides the water flow in the existing culvert to the downstream river channel through the aqueduct, thereby providing a working environment for the culvert to be built. Unlike traditional methods, it eliminates the need for two diversion measures, thus shortening the construction cycle of the entire culvert extension and saving construction costs. Attached Figure Description

[0029] Figure 1 This is an elevation diagram of a construction method for extending a culvert.

[0030] Figure 2 for Figure 1 Cross-sectional view of section AA.

[0031] Figure 3 This is a schematic diagram of a construction method for extending a culvert.

[0032] Figure 4 This is a schematic diagram of the cross-section of the aqueduct.

[0033] Marked in the image: 1- Existing culvert, 2-Downstream river channel, 3-Aqueduct, 301 - Bottom plate, 302 - Side plate, 303 - Back rib, 304 - Main keel, 305 - Tie rod. 4-Water inlet, 5-Outlet, 6-Culvert to be built 7-Water barrier, 8-Support pier. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0035] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0036] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0037] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0038] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0039] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to connection methods commonly used in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0040] Example 1 like Figures 1 to 4 As shown, a construction method for extending a culvert includes the following steps: S1: Construct a retaining wall 7 in the downstream river channel 2. Install an aqueduct 3 between the retaining wall 7 and the existing culvert 1, allowing water from the existing culvert 1 to flow into the downstream river channel 2 via the aqueduct 3. The aqueduct 3 has an inlet 4 and an outlet 5 connected to its two ends, respectively. The shape and size of the inlet 4 are adapted to the shape and size of the corresponding position of the cross-section of the existing culvert 1. The outlet 5 is installed on the retaining wall 7. The width of the aqueduct 3 is 0.5 to 0.8 times the inner contour width of the culvert 6 to be constructed, specifically 0.5, 0.6, 0.7, or 0.8 times. A predetermined distance is maintained between the bottom surface of the aqueduct 3 and the bottom slab of the culvert 6 to be constructed. This predetermined distance must ensure that the construction requirements of the bottom slab of the culvert 6 to be constructed are met. The predetermined distance can be 0.3m to 0.5m, specifically 0.3m, 0.35m, 0.4m, 0.45m, or 0.5m.

[0041] Specifically, both the inlet 4 and outlet 5 can be designed as trumpet-shaped structures. These trumpet-shaped structures have a bottom panel and two side panels, all made of steel plate, and are securely connected to the aqueduct 3 via welding. The central axis of the aqueduct 3 can be aligned with the central axis of the existing culvert 1. Using hoisting equipment, the aqueduct 3 is lifted to a predetermined height at the opening of the existing culvert 1, and then horizontally pushed into the existing culvert 1. Expansion bolts can be used to connect the inlet 4 of the aqueduct 3 to the inner wall of the existing culvert 1.

[0042] S2: Clean the accumulated water on the outside of the aqueduct 3 and seal the gap between the water inlet 4 and the inner wall of the existing culvert 1. Specifically, a water pump can be used to clean the accumulated water.

[0043] S3: Construct the new culvert 6 at the end of the existing culvert 1 closest to the downstream river channel 2. After the new culvert 6 is completed, remove the aqueduct 3 to complete the extension construction of the culvert. Specifically, an expansion joint can be reserved between the new culvert 6 and the existing culvert 1, or rebar can be installed on the end face of the existing culvert 1 to connect the new culvert 6 and the existing culvert 1 into a whole.

[0044] In an optional implementation, in step S2, the gap between the inlet 4 and the inner wall of the existing culvert 1 can be sealed with a rubber strip. Specifically, the thickness of the rubber strip should be 3mm-6mm greater than the width of the gap between the inlet 4 and the inner wall of the existing culvert 1.

[0045] In an optional implementation, in step S1, sandbags can be used to form a retaining wall 7. Specifically, the retaining wall 7 should be installed along the cross-sectional direction of the downstream river channel 2, and the height of the retaining wall 7 must exceed the highest water level that the water flow in the downstream river channel 2 can reach.

[0046] In an optional implementation, in step S1, before installing the aqueduct 3, the riverbed in the area where the culvert 6 is to be built can be cleaned and repaired to meet the construction requirements of the culvert 6.

[0047] In an optional implementation, in step S1, an excavator with a cutter suction pump and an excavator with a bucket can be used to clean and trim the riverbed.

[0048] In an optional embodiment, in step S1, the aqueduct 3 may include a bottom plate 301 and two side plates 302. The two side plates 302 are respectively connected to both sides of the bottom plate 301. The bottom surface of the bottom plate 301 and the outer sides of the two side plates 302 are connected to a main keel 304. The length direction of the main keel 304 is consistent with the length direction of the aqueduct 3. The main keel 304 on the outer sides of the two side plates 302 is provided with a back rib 303. A tie rod 305 is provided between the back ribs 303 on the outer sides of the two side plates 302.

[0049] Specifically, the bottom plate 301 and the two side plates 302 can be made of steel plates with a thickness of 4mm-6mm. The main keel 304 can be made of I-beams or channel steel with a cross-sectional height of 15cm-20cm. The back ribs 303 can be made of square steel pipes with a cross-sectional side length of 10cm-15cm, and the back ribs 303 are arranged vertically. The main keel 304 is welded to the bottom plate 301 or side plate 302, and the back ribs 303 are also welded to the main keel 304. The tie rod 305 can be a threaded rod or threaded steel, and both ends of the tie rod 305 are bolted to the corresponding back ribs 303. The spacing between two adjacent main keels 304 can be 20cm-30cm. The spacing between two adjacent back ribs 303 on the same side can be 20cm-40cm.

[0050] In an optional implementation, the upstream river channel can be diverted before step S1, and the diversion facilities can be dismantled after step S2 is completed. Specifically, the diversion measure can be a cofferdam, using earth and rock to fill the cofferdam and block the water flow. Generally, stones and sandbags are first thrown into the river channel to form a gap (the last opening through which the water flows during diversion), and then the width of the gap is gradually reduced until it is closed to complete the diversion.

[0051] In an optional implementation, in step S1, before installing the aqueduct 3, support piers 8 can be constructed in the area of ​​the aqueduct 3. The support piers 8 are used to support the bottom of the aqueduct 3. Specifically, the support piers 8 can be constructed by driving pipe piles, I-beams, or H-beams into the riverbed. The support piers 8 can be arranged in two rows, with each row of support piers 8 arranged along the length of the aqueduct 3. The top of the support piers 8 is connected to the bottom surface of the aqueduct 3 by fasteners, facilitating later dismantling.

[0052] In an optional implementation, step S3, constructing the culvert 6 to be built may include the following steps: S31: Foundation and bottom slab of culvert 6 to be constructed; S32: Reinforcing steel bars are tied and formwork is erected for the side walls and top slab of the culvert to be built (6), and finally the concrete pouring is completed.

[0053] The foundation of culvert 6 is located below the sidewalls of culvert 6, providing support for the sidewalls. The foundation of culvert 6 can be a strip foundation or a pile foundation. The bottom slab of culvert 6 is formed by pouring plain concrete. In this step, the remaining construction methods of culvert 6 are consistent with those in the prior art.

[0054] In an optional implementation, in step S2, after clearing the accumulated water outside the aqueduct 3, a water collection pit can be excavated in the area outside the aqueduct 3, and a water pump can be installed in the water collection pit to continuously drain the accumulated water.

[0055] In an optional implementation, in step S2, a steel casing can be installed in the sump. Specifically, the depth of the steel casing can be 0.8m-1.2m, and the cross-section of the steel casing is circular with a diameter of 0.5m-0.8m. Because the excavation area of ​​the sump may be silty soft soil with low strength and poor stability, it is prone to borehole instability. Installing the steel casing can enhance borehole stability, provide support, and significantly reduce the risk of borehole collapse, thereby ensuring continuous and stable pumping operations.

[0056] Theoretical comparative analysis shows that this construction plan reduces costs by more than 50% and increases efficiency by more than 30% compared to conventional methods.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method for lengthening a water culvert, characterized by, Includes the following steps: S1: Construct a retaining wall (7) in the downstream river channel (2), and install an aqueduct (3) between the retaining wall (7) and the existing culvert (1) so that the water in the existing culvert (1) flows through the aqueduct (3) to the downstream river channel (2); the two ends of the aqueduct (3) are respectively connected to a water inlet (4) and a water outlet (5). The shape and size of the water inlet (4) are adapted to the shape and size of the corresponding position of the cross-section of the existing culvert (1). The water outlet (5) is installed on the retaining wall (7). The width of the aqueduct (3) is the inner contour of the culvert (6) to be built. The bottom surface of the aqueduct (3) is 0.5 to 0.8 times the width of the culvert (6) and the bottom plate of the culvert to be built are kept at a predetermined distance; the inlet (4) and the outlet (5) are both funnel-shaped structures, and the funnel-shaped structure has a bottom panel and two side panels; when installing the aqueduct (3), the aqueduct (3) is hoisted to the opening position of the existing culvert (1) at a predetermined height, and then the aqueduct (3) is horizontally pushed into the existing culvert (1), and the inlet (4) of the aqueduct (3) is connected to the inner wall of the existing culvert (1) using expansion bolts; S2: Clean up the water accumulation on the outside of the aqueduct (3) and seal the gap between the water inlet (4) and the inner wall of the existing culvert (1); S3: Construct a new culvert (6) at one end of the existing culvert (1) near the downstream river channel (2). After the new culvert (6) is completed, dismantle the aqueduct (3) to complete the extension construction of the water-passing culvert.

2. The method according to claim 1, wherein In step S2, the gap between the water inlet (4) and the inner wall of the existing culvert (1) is sealed with a rubber strip.

3. The method according to claim 1, wherein In step S1, sandbags are used to build the water-retaining embankment (7).

4. The construction method for extending a culvert according to claim 1, characterized in that, In step S1, before installing the aqueduct (3), the riverbed in the area where the culvert (6) is to be built is cleaned and repaired to meet the construction requirements of the culvert (6).

5. The construction method for extending a culvert according to claim 4, characterized in that, In step S1, an excavator equipped with a cutter suction pump and an excavator with a bucket are used to clean and trim the riverbed.

6. A construction method for extending a culvert according to any one of claims 1-5, characterized in that, In step S1, the aqueduct (3) includes a bottom plate (301) and two side plates (302). The two side plates (302) are respectively connected to both sides of the bottom plate (301). The bottom surface of the bottom plate (301) and the outer sides of the two side plates (302) are connected to a main keel (304). The length direction of the main keel (304) is consistent with the length direction of the aqueduct (3). The main keel (304) on the outer side of the two side plates (302) is provided with a back rib (303). A tie rod (305) is provided between the back ribs (303) on the outer side of the two side plates (302).

7. The construction method for extending a culvert according to claim 6, characterized in that, Before step S1, the upstream river channel is diverted. After step S2 is completed, the diversion facilities are removed.

8. The construction method for extending a culvert according to claim 6, characterized in that, In step S1, before installing the aqueduct (3), support piers (8) are constructed in the area of ​​the aqueduct (3), and the support piers (8) are used to support the bottom of the aqueduct (3).

9. A construction method for extending a culvert according to claim 6, characterized in that, In step S3, the construction of the culvert (6) to be built includes the following steps: S31: Construction of the foundation and bottom slab of the culvert (6) to be built; S32: Reinforcing bars are tied and formwork is erected for the side walls and top slab of the culvert (6) to be built, and finally the concrete pouring operation is completed.

10. A construction method for extending a culvert according to claim 6, characterized in that, In step S2, after clearing the accumulated water outside the aqueduct (3), a water collection pit is excavated in the area outside the aqueduct (3), and a water pump is installed in the water collection pit to continuously drain the accumulated water.

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