A laying structure and method for a water supply pipeline to cross a bridge

Abstract

The present invention discloses a laying structure and method for a water supply pipeline to cross a bridge. The laying structure includes a water supply pipeline, a casing and a filling layer; the water supply pipeline is parallel to the bridge deck structure and buried underground under the bridge deck structure, and the water supply pipeline is located above the bridge box girder; the casing is coaxially sleeved outside the main body of the water supply pipeline, and a containing gap is formed between the inner wall of the casing and the outer wall of the water supply pipeline. A first anti-seepage layer and a heat preservation layer are arranged in the containing gap. The first anti-seepage layer is attached to the outer wall of the water supply pipeline, and the heat preservation layer is attached to the inner wall of the casing; the filling layer fills the space between the bridge deck structure and the bridge box girder. The laying structure of the present invention can ensure that the water supply pipeline does not leak, prevent vibration and play a heat preservation role, does not affect the wiring of other pipelines, is applicable to various bridge deck structures, and is especially applicable to important nodes such as crossing over and under railways, subways, expressways, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of underground engineering, and particularly relates to a laying structure and method for a water supply pipeline to cross a bridge. Background Art

[0002] It is relatively common for water supply and drainage pipelines to cross bridges. However, when the water supply pipeline is frozen in winter, or even leaks or bursts, it will pose great potential safety hazards to pedestrians and vehicles; at the same time, it will also pose great potential safety hazards to the urban water supply safety. At the same time, since the water supply pipeline is laid on the sidewalk of the bridge deck and has a shallow burial depth, heat preservation also needs to be considered. Currently, the conventional way to lay pipelines across the bridge deck is to directly lay the pipeline under the sidewalk without fully considering factors such as pipeline leakage, heat preservation, and vibration. Especially for bridges at special node positions such as crossing railways, subways, and highways, the problem of pipeline leakage is particularly important, which will also cause corrosion damage to the bridge and greatly affect the service life of the bridge. However, there is less research on the laying structure of water supply pipelines crossing bridges at present. Therefore, it is necessary to provide a safe and reliable pipeline laying method and structure for water supply pipelines to cross bridges, which can ensure that the water supply pipeline does not leak, so as to play a very important role in timely maintenance. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problem that there is no laying structure for water supply pipelines to cross bridges in the prior art, and to provide a laying structure and method for water supply pipelines to cross bridges. The laying structure of the present invention can ensure that the water supply pipeline does not leak, prevent vibration and play a heat preservation role, and at the same time can timely detect problems and provide maintenance when pipeline leakage and burst occur.

[0004] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0005] A laying structure for a water supply pipeline to cross a bridge, comprising a water supply pipeline, a sleeve, and a filling layer;

[0006] The water supply pipeline is parallel to the bridge deck structure and is buried under the bridge deck structure, and the water supply pipeline is located above the bridge box girder;

[0007] The sleeve is coaxially sleeved outside the main body of the water supply pipeline, and a receiving gap is formed between the inner wall of the sleeve and the outer wall of the water supply pipeline. A first anti-seepage layer and a heat preservation layer are arranged in the receiving gap. The first anti-seepage layer is attached to the outer wall of the water supply pipeline, and the heat preservation layer is attached to the inner wall of the sleeve;

[0008] The filling layer fills the space between the bridge deck structure and the bridge box girder.

[0009] In the technical solution of the present invention, the laying structure includes a water supply pipe, a casing, and a filling layer. The water supply pipe is fixed on the box girder of the bridge that passes through. The first anti-seepage layer can play an anti-seepage role for the water supply pipe, and the thermal insulation layer can play a thermal insulation role. The casing is arranged outside the thermal insulation layer. The coaxial casing and the water supply pipe can play a good protective effect on the outside of the pipe body to avoid damage to the outer wall of the pipe body due to external force. At the same time, the casing is used to facilitate timely opening of the water supply pipe for maintenance. The filling layer can withstand the pressure of the upper bridge deck structure to better protect the laying structure.

[0010] As a preferred solution of the present invention, the water supply pipe is fixed on the bridge box girder through a support, the support is relatively arranged at both ends of the water supply pipe, the support is a circular arc concrete support, the support is cast during the bridge casting, and the water supply pipe is fixed by the support after it is installed in place. Furthermore, an arc pad is embedded in the circular arc concrete support, and the space between the water supply pipe and the arc pad is fully coated with a special roller and fully wrapped with grease, so that the water supply pipe can be easily moved when it is vibrated.

[0011] As a preferred solution of the present invention, a second anti-seepage layer is provided in the accommodating gap, and the second anti-seepage layer is provided on the outer wall surface of the water supply pipe, and is used to closely adhere to the surface of the main body of the water supply pipe to prevent leakage, thereby improving the anti-seepage effect. More preferably, the first anti-seepage layer is formed by applying a waterproof coating on the outer wall of the water supply pipe, and has a thickness of 2 to 5 mm.

[0012] As a preferred embodiment of the present invention, the insulation layer is a polyurethane foam insulation layer or a plugging material insulation layer, which can keep the heat and prevent the pipeline from being vibrated and damaged. More preferably, the thickness of the insulation layer is 6 to 15 cm.

[0013] As a preferred embodiment of the present invention, the sleeve is a steel tube or a plastic sleeve, the upper part and the side of the sleeve can be opened by a zipper, and the zipper part is made of a movable soft material, such as a PE plastic sleeve or a sleeve made of Q235 steel.

[0014] As a preferred solution of the present invention, the filling layer is made of light permeable filling material, which can be easily spread out during vibration and maintenance of the water supply pipeline, and can also facilitate water seepage. The light permeable filling material fills the laying space between the bridge deck structure and the flange plate.

[0015] As a preferred embodiment of the present invention, the first anti-seepage layer uses an expansive soil material, which is spread around the water supply pipe. The expansive soil material will swell when it encounters water, and can play a blocking role when the water supply pipe leaks. The thickness of the first anti-seepage layer is 3-6 cm.

[0016] As a preferred embodiment of the present invention, the laying structure is further provided with a water leakage detection induction wire, which is arranged in the first anti-seepage layer and is laid at intervals along the length direction of the water supply pipe. When it is detected that the water supply pipe leaks, the water leakage detection induction wire can detect a signal for response and feedback it to the control system for timely maintenance.

[0017] As a preferred embodiment of the present invention, the laying structure is further provided with a pressure sensor, which is arranged in the first anti-seepage layer and / or the insulation layer, and is arranged at intervals along the length direction of the water supply pipe, with an interval distance of 2 to 5 m. The first anti-seepage layer uses expansive soil material. When the water supply pipe leaks, the expansive soil will expand, and the pressure sensor at the leakage point receives a signal, indicating that the water supply pipe leaks. The insulation layer is a polyurethane foam material insulation layer or a plugging material insulation layer. When the water supply pipe bursts, the polyurethane foam material or the plugging material will absorb water and automatically plug the burst gap to achieve automatic water stoppage, and at the same time, it will release a part of the space to reduce the bursting pressure of the water supply pipe. Preferably, the pressure sensor is arranged in the first anti-seepage layer of the expansive soil material. Further, on the cross-section of the water supply pipe, four pressure sensors are arranged, and the four pressure sensors are respectively located at the top, bottom, left, and right of the water supply pipe. Through the above settings, the pressure values in each direction of the water supply pipe can be fully detected and monitored. By perceiving the pressure change between two adjacent pressure sensors in the length direction of the water supply pipe, the leakage position of the water supply pipe can be inferred for timely maintenance.

[0018] As a preferred embodiment of the present invention, the laying structure is further provided with a water seepage pipe, which is connected to a drain pipe at the lower part. The outlet of the drain pipe is located outside the bridge and is used to collect the water generated by the leakage or bursting of the water supply pipe into the water seepage pipe and then discharge it into the bridge deck drainage system through the drain pipe to prevent water accumulation in the laying space. Specifically, the water seepage pipe is internally equipped with a siphon water nozzle. When the water supply pipe bursts, a large amount of water will be generated, and the setting of the siphon water nozzle can drain the water more quickly. The water seepage pipe is usually arranged along the bridge length and has small holes on the outside, which can timely penetrate and discharge the external ground seepage water, the water leakage of the water supply pipe, and the water from the bursting of the pipe.

[0019] On the other hand, the present invention also provides a laying method for a water supply pipe passing through a bridge for the construction of the above laying structure, including the following steps:

[0020] Step S1, prefabricate the water supply pipe according to the designed requirements and dimensions;

[0021] Step S2, construct the first anti-seepage layer and the insulation layer on the outer wall of the water supply pipe in sequence, and then sleeved the casing on the water supply pipe;

[0022] Step S3: Fix the water supply pipe after completing Step S2 on the bridge box girder.

[0023] Step S4: Construct the filling layer to the bottom elevation of the bridge deck structure.

[0024] The present invention also provides a method for monitoring water leakage of a water supply pipe, which is used for monitoring the laying structure of the water supply pipe passing through the bridge. The monitoring method is as follows: when the signal of the pressure sensor or the water leakage signal of the water leakage detection induction wire is detected, it is determined that the water supply pipe does not leak.

[0025] When both the pressure sensor and the water leakage detection induction wire detect a water leakage signal, it is determined that the water supply pipe leaks. The pressure sensor transmits the detected pressure information to the control system to determine the water leakage volume of the water supply pipe, enabling maintenance personnel to monitor the state of the water supply pipe and repair the leaking water supply pipe. The calculation formula for the water leakage volume of the water supply pipe is as follows:

[0026] Q2 = K2 * S * V

[0027] Q2 is the water leakage volume determined by the pressure sensor; K2 is the non-uniformity coefficient; S is the cross-sectional area of the first anti-seepage layer, V is the water leakage propagation speed at the water leakage point, V = L / (t2 - t1), L is the distance between the two pressure sensors, t1 is the moment when one pressure sensor detects an increase in pressure, and t2 is the moment when the next pressure sensor in the length direction of the water supply pipe detects an increase in pressure.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. The laying structure of the present invention includes a water supply pipe, a casing, and a filling layer. The water supply pipe is fixed on the crossed bridge. The first anti-seepage layer can play an anti-seepage role for the water supply pipe, and the heat preservation layer can play a heat preservation role. The casing is arranged outside the heat preservation layer, and the coaxial sleeve of the casing and the water supply pipe can play a good protective effect on the outer side of the pipe body, avoiding damage to the outer wall of the pipe body due to external forces. At the same time, it is convenient to open it in time for maintenance during overhaul. The filling layer can bear the pressure of the upper bridge deck structure and better protect the laying structure. The laying structure of the present invention can ensure that the water supply pipe does not leak, prevent vibration and play a heat preservation role, does not affect the wiring of other pipes, is applicable to various bridge deck structures, and is especially applicable to important nodes such as overpassing and underpassing railways, subways, and expressways.

[0030] 2. The construction method of the laying method of the water supply pipe of the present invention is simple, the construction cost is low, the construction period is short, and no additional structure needs to be added, which is suitable for a large number of popularizations and applications.

[0031] 3. The leakage monitoring method of the present invention enables maintenance personnel to monitor the status of the water supply pipeline and repair the leaking water supply pipeline. Through the described monitoring method, the leakage area can be accurately judged, and the general location of the leakage point can be determined, facilitating timely treatment of pipeline leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of the left side of the bridge in Embodiment 1;

[0033] Figure 2 is Figure 1 a partial enlarged view of;

[0034] Figure 3 It is a schematic structural diagram of the right side of the bridge in Embodiment 1;

[0035] Markings in the figure: 1 - flange plate, 2 - bridge deck structure, 21 - RPC sidewalk slab, 22 - mortar layer, 23 - sidewalk bricks, 24 - concrete sidewalk slab, 3 - anti-collision guardrail, 4 - water supply pipeline, 5 - casing, 6 - filling layer, 7 - first anti-seepage layer, 8 - insulation layer, 9 - support, 10 - leakage detection induction wire, 11 - pressure sensor, 12 - drain pipe, 13 - drain pipe, 14 - communication pipe, 15 - gas pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The present invention will be further described in detail below in conjunction with test examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention belong to the scope of the present invention.

[0037] Embodiment 1

[0038] A laying structure for a water supply pipeline passing through a bridge, comprising a water supply pipeline 4, a casing 5 and a filling layer 6;

[0039] The water supply pipeline 4 is parallel to the bridge deck structure 2 and is buried underground under the bridge deck structure 2, and the water supply pipeline 4 is located above the bridge box girder;

[0040] The casing 5 is coaxially sleeved outside the main body of the water supply pipeline 4, and a receiving gap is formed between the inner wall of the casing 5 and the outer wall of the water supply pipeline 4. A first anti-seepage layer 7 and an insulation layer 8 are arranged in the receiving gap. The first anti-seepage layer 7 is in contact with the outer wall of the water supply pipeline 4, and the insulation layer 8 is in contact with the inner wall of the casing 5;

[0041] The filling layer 6 fills the space between the bridge deck structure 2 and the bridge box girder.

[0042] Such as Figure 1 、 Figure 2As shown in the figure, in this embodiment, the water supply pipeline 4 passes through the bridge. The bridge is a box girder structure. On both sides of the box girder flange plate 1, there are bridge deck structures 2. On both edges of the bridge flange plate 1, there are anti-collision guardrails 3. Between the bridge deck structure 2 and the flange plate 1 is a laying space. The laying space on the left side of the bridge is divided into two parts by a sleeper beam, which are respectively used for laying the water supply pipeline 4 and the power cable duct. The power cable duct is used for burying power cables; the laying space on the right side of the bridge is divided into two parts by a sleeper beam, which are respectively used for laying the communication duct 14 and the gas pipeline 15, as Figure 3 shown.

[0043] The bridge deck structures 2 on different laid pipelines are different. In this embodiment, the bridge deck structure 2 on the water supply pipeline 4 from bottom to top includes an RPC sidewalk slab (reactive powder concrete sidewalk slab), a mortar layer 22, and sidewalk bricks 23. The bridge deck structure 2 on the power cable duct from bottom to top includes a concrete sidewalk slab 24, a mortar layer 22, and sidewalk bricks 23. The thickness of the RPC sidewalk slab is 4 cm, the thickness of the mortar layer 22 is 1 cm, the thickness of the sidewalk bricks 23 is 3 cm, and the thickness of the concrete sidewalk slab 24 is 8 cm. The bridge deck structure 2 in the middle of the bridge from bottom to top includes a concrete leveling layer and an asphalt layer. The thickness of the concrete leveling layer is 10 cm, and the thickness of the asphalt layer is 10 cm. The water supply pipeline 4 in this embodiment is prefabricated in the factory, and multiple sections of the water supply pipeline 4 are welded and connected on site.

[0044] The water supply pipeline 4 is fixed on the bridge box girder through supports 9. The supports 9 are relatively arranged at both ends of the water supply pipeline 4. The supports 9 are arc-shaped concrete supports 9 with a concrete strength of C30. The supports 9 are constructed by casting during the bridge pouring. When the water supply pipe is installed in place, it is fixed through the supports 9. In some embodiments, arc-shaped pads are embedded in the arc-shaped concrete supports 9, and special roller grease is fully coated between the water supply pipeline 4 and the arc-shaped pads, which can facilitate the movement of the water supply pipeline 4 when it is vibrated.

[0045] The first anti-seepage layer 7 uses expansive soil material. The expansive soil material is spread around the water supply pipeline 4. The expansive soil material will expand when it encounters water, and it can play a role in plugging when the water supply pipeline 4 leaks. The thickness of the first anti-seepage layer 7 is 3 - 6 cm.

[0046] A second anti-seepage layer is arranged in the accommodation gap. The second anti-seepage layer is arranged on the outer wall surface of the water supply pipeline 4, and is used to closely adhere to the surface of the main body of the water supply pipeline 4 to prevent leakage, thereby improving the anti-seepage effect. Preferably, the first anti-seepage layer 7 is made of waterproof coating, which is formed by coating on the outer wall of the water supply pipeline 4, and the thickness is 2 - 5 mm.

[0047] The heat-insulating layer 8 is a polyurethane foam material heat-insulating layer or a plugging material heat-insulating layer, which can keep warm and prevent the pipeline from being damaged by vibration. The thickness of the heat-insulating layer 8 is 6-15 cm. The casing 5 is a steel pipe or a plastic casing. The upper part and the side of the casing 5 can be opened by a zipper, and the zipper part is made of a movable soft material, specifically, such as a PE plastic casing or a casing made of Q235 steel.

[0048] The filling layer 6 adopts a lightweight water-permeable filling material. The lightweight water-permeable filling material can facilitate the vibration of the water supply pipeline 4 and be spread out during maintenance, and at the same time meet the requirement of underwater seepage for convenient water permeability. In this embodiment, the lightweight water-permeable filling material fills the laying space between the bridge deck structure 2 and the flange plate 1.

[0049] The laying structure is further provided with a water leakage detection induction wire 10. The water leakage detection induction wire 10 is arranged in the first anti-seepage layer. The water leakage detection induction wire 10 is laid at intervals along the length direction of the water supply pipeline 4. When it is detected that the water supply pipeline 4 leaks, the water leakage detection induction wire 10 can detect the signal and respond, and feedback to the control system for timely maintenance.

[0050] The laying structure of this embodiment is further provided with a pressure sensor 11. The pressure sensor 11 is arranged in the first anti-seepage layer 7 and / or the heat-insulating layer 8, and is arranged at intervals along the length direction of the water supply pipeline 4, and the interval distance is 2-5 m. The first anti-seepage layer 7 uses an expansive soil material. When the water supply pipeline 4 leaks, the expansive soil will expand. The expansive soil will squeeze the water supply pipeline 4, and the increased pressure of the expansive soil will reduce the water leakage amount of the water supply pipeline 4. The pressure sensor 11 at the leakage point receives the signal, indicating that the water supply pipeline 4 leaks. The first anti-seepage layer 7 using the expansive soil material can also increase the sealing performance of the water supply pipeline joints and welding points, and further enhance the corrosion resistance of the steel pipeline. The heat-insulating layer 8 is a polyurethane foam material heat-insulating layer or a plugging material heat-insulating layer. When the water supply pipeline 4 bursts, the polyurethane foam material or the plugging material will absorb water and automatically plug the burst gap to achieve automatic water stop, and at the same time will release a part of the space to reduce the burst pressure of the water supply pipeline 4. Preferably, the pressure sensor 11 is arranged in the first anti-seepage layer 7 of the expansive soil material. In some embodiments, on the cross-section of the water supply pipeline 4, four pressure sensors 11 are arranged. The four pressure sensors 11 are respectively located at the top, bottom, left and right of the water supply pipeline 4. Through the above settings, the pressure values in each direction of the water supply pipeline 4 can be fully detected and monitored. By the pressure change sensed by two adjacent pressure sensors 11 in the length direction of the water supply pipeline 4, the leakage position of the water supply pipeline 4 can be inferred for timely maintenance.

[0051] Further, the laying structure is also provided with a water infiltration pipe 12, a drain pipe 13 is connected below the water infiltration pipe 12, and the outlet of the drain pipe 13 is located outside the bridge, which is used to collect the water generated by the leakage or pipe burst of the water supply pipe 4 into the water infiltration pipe 12, and then discharge it into the bridge deck drainage system through the drain pipe 13 to prevent water accumulation in the laying space. Specifically, a siphon nozzle is installed inside the water infiltration pipe 12. When the water supply pipe 4 bursts, a large amount of water will be generated. The setting of the siphon nozzle can discharge the water more quickly. In this embodiment, the water infiltration pipe 12 is usually arranged along the bridge length, and there are small holes on the outside, which can timely infiltrate and discharge the external ground seepage water, the water leakage of the water supply pipe 4 and the water from the pipe burst.

[0052] Embodiment 2

[0053] This embodiment provides a method for detecting water leakage in the water supply pipe in Embodiment 1. When only one water leakage signal, that is, the signal of the pressure sensor 11 or the signal of the water leakage detection induction wire 10, is detected, it is determined that the water supply pipe 4 does not leak water, which may be a false alarm and is only represented as a warning;

[0054] When both the pressure sensor 11 and the water leakage detection induction wire 10 detect water leakage signals, it is determined that the water supply pipe 6 leaks water. The pressure sensor 11 transmits the detected pressure information to the control system to determine the water leakage volume of the water supply pipe, so that the maintenance personnel can monitor the state of the water supply pipe 4 and repair the leaking water supply pipe 4.

[0055] The water leakage volume of the water supply pipe is determined by the following method:

[0056] The water leakage volume is calculated according to the time when the pressure increase is detected by different pressure sensors. When the pressure increase (or peak value) is detected by one pressure sensor at time t1, and the pressure increase (or peak value) is detected by the next pressure sensor at time t2, the water flow propagation speed at the water leakage point is V = L / (t2 - t1), where L is the distance between the two pressure sensors. Then the calculation formula for the water leakage volume Q2 determined by the pressure sensor is:

[0057] Q2 = K2 * S * V

[0058] Where K2 is the non-uniformity coefficient, which is between 0.95 and 1.05, and S is the cross-sectional area of the first anti-seepage layer.

[0059] When water leakage occurs in the water supply pipe 4, the leaked water will flow into the first anti-seepage layer 7 and / or the heat insulation layer 8. The pressure sensor 11 will detect a signal, and then the pressure sensor 11 will transmit the detected pressure information to the control system, enabling maintenance personnel to monitor the state of the water supply pipe 4 and repair the water supply pipe 4 with water leakage or burst pipe. After determining the flow rate and water leakage volume, the signal can be transmitted to the tap water management center, and the management personnel will send relevant personnel for inspection or automatically close the valves at both ends and transmit the valve signals to the management center.

[0060] Through the above monitoring method, the leakage area can be accurately judged, and the general position of the leakage point can be judged. The above water leakage detection method is also applicable to the burst pipe of the water supply pipe 4, and the burst pipe or water leakage can be judged according to the water leakage volume of the water supply pipe.

[0061] Embodiment 3

[0062] This embodiment provides a laying method for a water supply pipe passing through a bridge, which is used for the construction of the laying structure in Embodiment 1, and includes the following steps:

[0063] Step S1, prefabricate the water supply pipe 4 according to the design requirements and dimensions;

[0064] Step S2, construct the first anti-seepage layer 7 and the heat insulation layer 8 on the outer wall of the water supply pipe 4 in sequence, and then sleuth the sleeve 5 on the water supply pipe 4;

[0065] Step S3, fix the water supply pipe 4 after completing Step S2 on the bridge box girder;

[0066] Step S4, construct the filling layer 6 to the bottom elevation of the bridge deck structure 2.

[0067] Among them, the second anti-seepage layer is coated on the outer wall surface of the water supply pipe 4 before constructing the first anti-seepage layer 7, and then the first anti-seepage layer 7 is constructed after completion; the water leakage detection induction wire 10 is embedded at set intervals when constructing the second anti-seepage layer in Step S2, and the pressure sensor 11 is embedded at set intervals when constructing the first anti-seepage layer 7 or the heat insulation layer 8 in Step S2; the water seepage pipe 12 and the drain pipe 13 are installed according to the installation position of the water supply pipe 4 before Step S3.

[0068] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A laying structure for a water supply pipeline passing through a bridge, comprising a water supply pipeline (4), a sleeve (5), and a filling layer (6), characterized in that the water supply pipeline (4) is parallel to the bridge deck structure (2) and buried underground under the bridge deck structure (2), and the water supply pipeline (4) is located above the bridge box girder; the sleeve (5) is coaxially sleeved outside the main body of the water supply pipeline (4), and a receiving gap is formed between the inner wall of the sleeve (5) and the outer wall of the water supply pipeline (4). A first anti-seepage layer (7) and a heat insulation layer (8) are arranged in the receiving gap. The first anti-seepage layer (7) is attached to the outer wall of the water supply pipeline (4), and the heat insulation layer (8) is attached to the inner wall of the sleeve (5); the first anti-seepage layer (7) uses an expansive soil material, and the thickness of the first anti-seepage layer (7) is 3 - 6 cm; the filling layer (6) fills the space between the bridge deck structure (2) and the bridge box girder; the laying structure is further provided with a pressure sensor (11), and the pressure sensor (11) is arranged in the first anti-seepage layer (7) or the heat insulation layer (8), and is arranged at intervals along the length direction of the water supply pipeline (4), and the interval distance is 2 - 5 m.

2. The laying structure of the water supply pipeline passing through the bridge according to claim 1, characterized in that, the water supply pipeline (4) is fixed on the bridge box girder through a support (9), and the supports (9) are oppositely arranged at both ends of the water supply pipeline (4), and the support (9) is an arc-shaped concrete support (9).

3. The laying structure of the water supply pipeline passing through the bridge according to claim 1, characterized in that, a second anti-seepage layer is arranged in the receiving gap, and the second anti-seepage layer is arranged on the outer wall surface of the water supply pipeline (4), and the thickness is 2 - 5 mm.

4. The laying structure of the water supply pipeline passing through the bridge according to claim 1, characterized in that, the heat insulation layer (8) is a polyurethane foam material heat insulation layer (8) or a plugging material heat insulation layer (8), and the thickness of the heat insulation layer (8) is 6 - 15 cm.

5. The laying structure of the water supply pipeline crossing the bridge according to claim 1, characterized in that, the laying structure is further provided with a drain pipe (12), and a drain pipe (13) is connected below the drain pipe (12), and the outlet of the drain pipe (13) is located outside the bridge.

6. The laying structure of the water supply pipeline passing through the bridge according to claim 1, characterized in that, the laying structure is further provided with a leakage detection induction wire (10), and the leakage detection induction wire (10) is arranged in the first anti-seepage layer, and the leakage detection induction wire (10) is laid at intervals along the length direction of the water supply pipeline (4).

7. A method for monitoring leakage of a water supply pipeline, which is used for monitoring the laying structure of the water supply pipeline passing through a bridge as described in claim 6, characterized in that, The monitoring method is: when the signal of the pressure sensor (11) or the leakage signal of the leakage detection induction wire (10) is detected, it is determined that the water supply pipeline (4) does not leak; when both the pressure sensor (11) and the leakage detection induction wire (10) detect a leakage signal, it is determined that the water supply pipeline (4) leaks. The pressure sensor (11) transmits the detected pressure information to the control system to determine the water leakage amount of the water supply pipeline, so that maintenance personnel can monitor the state of the water supply pipeline (4) and repair the leaking water supply pipeline (4); the calculation formula for the water leakage amount of the water supply pipeline is as follows: Q2 = K2 * S * V Q2 is the water leakage amount determined by the pressure sensor; K2 is the non-uniformity coefficient; S is the cross-sectional area of the first anti-seepage layer (7), V is the water leakage propagation speed at the water leakage point, V = L / (t2 - t1), L is the distance between the two pressure sensors (11), t1 is the moment when one of the pressure sensors (11) detects an increase in pressure, and t2 is the moment when the next pressure sensor (11) in the length direction of the water supply pipeline (4) detects an increase in pressure.

8. A laying method for a water supply pipeline to cross a bridge, characterized in that, The construction of the laying structure for the water supply pipeline crossing the bridge according to any one of claims 1-6 includes the following steps: Step S1, prefabricate the water supply pipeline (4) according to the designed required dimensions; Step S2, construct the first anti-seepage layer (7) and the heat insulation layer (8) on the outer wall of the water supply pipeline (4) in sequence, and then sleuth the sleeve (5) on the water supply pipeline (4); Step S3, fix the water supply pipeline (4) completed in Step S2 on the bridge box girder; Step S4, construct the filling layer (6) to the bottom elevation of the bridge deck structure (2).

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