An automatically heatable secondary lining trolley for tunnels and a tunnel heating and curing method

Abstract

The present invention belongs to the technical field of tunnel maintenance, and particularly relates to a tunnel secondary lining trolley capable of automatic heating and a tunnel heating and maintenance method. A tunnel secondary lining trolley capable of automatic heating includes a secondary lining trolley main body, an automatic pressurized hot water circulation device installed on the frame of the secondary lining trolley main body, and a controller. A secondary lining trolley formwork matching the tunnel contour is provided on the outer side of the frame of the secondary lining trolley main body. A heat preservation layer is provided on the outer surface of the secondary lining trolley formwork. A hot water pipeline is provided between the secondary lining trolley formwork and the heat preservation layer. The automatic pressurized hot water circulation device and the controller are connected through a data cable. The controller controls the automatic pressurized hot water circulation device to provide circulating hot water for the hot water pipeline to perform heat preservation operation on the secondary lining trolley formwork. By arranging a heat preservation layer and a hot water pipeline on the outer surface of the secondary lining trolley formwork, the present invention can realize the integration of concrete pouring and heating and maintenance, reduce equipment investment, utilize on-site operations, and reduce construction costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel maintenance, and particularly relates to a tunnel secondary lining trolley capable of automatic heating and a tunnel heating maintenance method. Background Art

[0002] At present, the maintenance of tunnel secondary lining concrete in China generally adopts maintenance methods such as natural maintenance, water spraying (mist) maintenance, etc. These maintenance methods are greatly affected by environmental temperature and human interference, and the maintenance effect is unstable, and it is difficult to achieve the conditions of heat preservation and moisture preservation. In recent years, with the continuous improvement of people's understanding of the importance of early concrete maintenance, especially the research finding that the strength and quality of concrete can be improved by early heating concrete maintenance. To solve the maintenance problem of secondary lining concrete, there has emerged an intelligent maintenance trolley, mainly through the method of steam curing + closed space, to achieve the constant temperature and humidity maintenance of lining concrete. However, the method of using an intelligent maintenance trolley not only increases the investment in construction costs, but also follows closely behind the secondary lining trolley, occupying the already limited space of the tunnel, affecting the pouring of the secondary lining trolley, and being unfavorable to on-site construction operations.

[0003] Research has shown that the 24 hours after concrete pouring is the best period for the strength growth of concrete. At this time, heating maintenance can significantly improve the strength and quality of concrete. However, due to the influence of the form removal time of the secondary lining trolley, it is very difficult to carry out concrete heating and heat preservation maintenance at this time. On-site operations are all carried out after form removal and the displacement of the secondary lining trolley, and the time from the completion of concrete pouring often exceeds 24 hours, missing the best heating maintenance period. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the present invention is to provide a tunnel secondary lining trolley capable of automatic heating and a tunnel heating maintenance method, which can detect the concrete temperature in real time, adjust the maintenance water temperature, ensure that the form temperature and the concrete temperature are within the set range, reduce the risk of concrete cracking, improve the concrete strength, realize the integration of concrete pouring and heating maintenance, reduce equipment investment, utilize on-site operations, and reduce construction costs.

[0005] The technical solution of the present invention lies in: a tunnel secondary lining trolley capable of automatic heating, which includes a secondary lining trolley main body, an automatic pressurized hot water circulation device installed on the frame of the secondary lining trolley main body, and a controller. On the outer side of the frame of the secondary lining trolley main body, there is a secondary lining trolley formwork matching the tunnel contour. The secondary lining trolley formwork is movably connected to the secondary lining trolley main body through a plurality of hydraulic jacks. The outer surface of the secondary lining trolley formwork is provided with a heat preservation layer. A hot water pipeline is arranged between the secondary lining trolley formwork and the heat preservation layer. The hot water pipeline is connected to the automatic pressurized hot water circulation device. The automatic pressurized hot water circulation device and the controller are connected through a data line. The controller controls the automatic pressurized hot water circulation device to provide circulating hot water for the hot water pipeline to perform heat preservation operation on the secondary lining trolley formwork.

[0006] The hot water pipeline includes multiple groups of circumferential heating pipes, longitudinal heat supply pipes and longitudinal return pipes. The multiple groups of circumferential heating pipes are uniformly arranged along the tunnel circumference on the outer side of the secondary lining trolley formwork. One end of each group of circumferential heating pipes is connected to the longitudinal heat supply pipe, and the other end is connected to the longitudinal return pipe. The shape of the circumferential heating pipe is "helix" or "continuous U-shaped". The longitudinal heat supply pipe and the longitudinal return pipe are respectively arranged at the bottom on both sides of the tunnel trolley, parallel to the tunnel axis.

[0007] A plurality of temperature sensors are radially arranged on the outer side of the secondary lining trolley formwork. The temperature sensors are connected to the controller through a data line.

[0008] The temperature sensors are divided into three groups. One group of temperature sensors is located at the center of the arched top of the secondary lining trolley formwork, and the other two groups are respectively located on both sides of the arch of the secondary lining trolley formwork.

[0009] The automatic pressurized hot water circulation device includes a total water inlet pipe, a pressurization part, a heating part and a hot water outlet pipe connected in sequence. A total water inlet valve is arranged on the pipeline between the total water inlet pipe and the pressurization part. A water temperature sensor and a pressure sensor are arranged on the pipeline between the hot water outlet pipe and the heating part. The water temperature sensor and the pressure sensor are respectively connected to the controller through a data line.

[0010] The water inlet of the hot water pipeline is connected to the hot water outlet pipe. The water outlet of the hot water pipeline is connected to the pipeline of the water inlet of the pressurization part. A one-way valve is arranged on the pipeline at the connection of the water outlet of the hot water pipeline and the water inlet of the pressurization part.

[0011] The pipeline material of the hot water pipeline adopts a flexible pipe material.

[0012] A tunnel heating and curing method uses any one of the above-mentioned tunnel secondary lining trolleys capable of automatic heating, and includes the following steps:

[0013] S1: After the automatically heatable secondary lining trolley for tunnel is in place, the formwork of the secondary lining trolley is positioned by hydraulic jacks according to construction requirements, and then concrete is poured. The probe of the temperature sensor radially arranged on the outer side of the formwork of the secondary lining trolley contacts the concrete surface;

[0014] S2: After the concrete pouring is completed, without formwork removal operation, the maintenance of the secondary lining concrete of the tunnel is directly carried out. The specific process is as follows: The controller automatically determines whether the temperature detected by the temperature sensor is within the deviation range set for the detected temperature of the secondary lining concrete. If the detected temperature is lower than the minimum negative deviation value of the set temperature of the secondary lining concrete, the controller controls the heating part of the automatically pressurized hot water circulation device to start working, heats the hot water in the hot water pipeline, and conducts heat preservation maintenance on the concrete; if the detected concrete temperature reaches the maximum positive deviation value of the set detected temperature of the secondary lining concrete, the controller controls the heating part of the automatically pressurized hot water circulation device to stop working, and the hot water in the hot water pipeline circulates normally to conduct heat preservation maintenance on the concrete;

[0015] S3: After the heat preservation maintenance of the concrete is completed, the hydraulic jack retracts the formwork of the secondary lining trolley, completes the pouring of the secondary lining concrete of the tunnel, and the automatically heatable secondary lining trolley for tunnel is shifted to other working faces.

[0016] The technical effects of the present invention are as follows: 1. By arranging a heat preservation layer and a hot water pipeline on the outer surface of the formwork of the secondary lining trolley, the hot water in the hot water pipeline circulates to generate heat, conducts heat preservation maintenance on the concrete after formwork pouring, and the heat preservation layer insulates the heat generated by the hot water pipeline to prevent heat dissipation, overcoming the defect that the traditional maintenance method cannot realize the maintenance effect on the early strength of concrete, making full use of the golden time before formwork removal after concrete pouring, and improving the early strength and quality of concrete; 2. The present invention makes up for the defect that the existing secondary lining trolley has a single use and cannot take heat preservation measures for the secondary lining concrete. At the same time, it can automatically adjust the water temperature and flow according to the change of concrete temperature, ensure that the temperature difference of concrete maintenance is within the set range, reduce the risk of concrete cracking, and realize automatic heat preservation maintenance, which is simple and convenient; 3. The present invention can improve the early strength of concrete before formwork removal, ensure the quality of concrete, save the investment in constant temperature and humidity maintenance trolleys, reduce the occupation of tunnel space, and improve the pouring efficiency.

[0017] The following will be further described in conjunction with the drawings. Description of the Drawings

[0018] Figure 1 It is the front view cross-sectional view of the structure of an automatically heatable secondary lining trolley for tunnel according to an embodiment of the present invention.

[0019] Figure 2 It is the side view cross-sectional view of the structure of an automatically heatable secondary lining trolley for tunnel according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic structural diagram of an automatic pressurization hot water circulation device for a tunnel secondary lining trolley capable of automatic heating according to an embodiment of the present invention.

[0021] Figure 4 This is a control flowchart among a water temperature sensing device, a pressure sensing device and a controller of a tunnel secondary lining trolley capable of automatic heating according to an embodiment of the present invention.

[0022] Reference numerals: 1. Secondary lining trolley main body; 2. Hot water pipeline; 3. Heat insulation layer; 4. Temperature sensor; 5. Automatic pressurization hot water circulation device; 6. Controller; 7. Secondary lining trolley formwork; 8. Hydraulic jack; 21. Circumferential heating pipe; 22. Longitudinal heating pipe; 23 - Longitudinal return water pipe; 51. Total water inlet pipe; 52. Hot water outlet pipe; 53. Heating part; 54. Pressurization part; 511. Total water inlet valve; 521. Check valve; 531. Water temperature sensor; 541. Pressure sensor. Detailed implementation manners

[0023] Embodiment 1

[0024] As Figure 1 shown, a tunnel secondary lining trolley capable of automatic heating includes a secondary lining trolley main body 1, an automatic pressurization hot water circulation device 5 and a controller 6 installed on the frame of the secondary lining trolley main body 1. A secondary lining trolley formwork 7 matching the tunnel contour is arranged on the outer side of the frame of the secondary lining trolley main body 1. The secondary lining trolley formwork 7 is movably connected to the secondary lining trolley main body 1 through a plurality of hydraulic jacks 8. A heat insulation layer 3 is arranged on the outer surface of the secondary lining trolley formwork 7. A hot water pipeline 2 is arranged between the secondary lining trolley formwork 7 and the heat insulation layer 3. The hot water pipeline 2 is connected to the automatic pressurization hot water circulation device 5. The automatic pressurization hot water circulation device 5 and the controller 6 are connected by a data line. The controller 6 controls the automatic pressurization hot water circulation device 5 to provide circulating hot water for the hot water pipeline 2 to perform heat preservation operation on the secondary lining trolley formwork 7.

[0025] During actual use, in the present invention, a heat preservation layer 3 and a hot water pipeline 2 are arranged on the outer surface of the secondary lining trolley formwork 7. The hot water in the hot water pipeline 2 circulates to generate heat, and the concrete after pouring the formwork 7 is heated and cured. The heat preservation layer 3 insulates the heat generated by the hot water pipeline 2 to prevent heat dissipation, overcoming the problem that the traditional curing method cannot achieve the curing effect on the early strength of concrete. It can make full use of the golden time before the formwork is removed after concrete pouring, improve the early strength and quality of concrete. A display instrument is arranged on the controller, which is used to display data such as hot water temperature, hot water pressure, formwork temperature, and secondary lining concrete temperature. It can automatically adjust the water temperature and flow rate of the automatic pressurized hot water circulation device 5 according to the change of concrete temperature, ensure that the curing temperature difference of concrete is within the set range, reduce the risk of concrete cracking, and realize automatic heating and curing, which is simple and convenient. The present invention can improve the early strength of concrete before formwork removal, ensure the quality of concrete, save the investment in constant temperature and humidity curing trolleys, reduce the occupation of tunnel space, and improve the pouring efficiency.

[0026] Embodiment 2

[0027] Preferably, on the basis of Embodiment 1, as Figure 2 shown, in this embodiment, the hot water pipeline 2 includes multiple groups of circumferential heating pipes 21, longitudinal heat supply pipes 22, and longitudinal return pipes 23. The multiple groups of circumferential heating pipes 21 are uniformly arranged along the tunnel circumference on the outer side of the secondary lining trolley formwork 7. One end of each group of circumferential heating pipes 21 is connected to the longitudinal heat supply pipe 22, and one end is connected to the longitudinal return pipe 23. The shape of the circumferential heating pipe 21 is "spiral" or "continuous U-shaped". The longitudinal heat supply pipe 22 and the longitudinal return pipe 23 are respectively arranged at the bottom on both sides of the tunnel trolley, parallel to the tunnel axis.

[0028] During actual use, the hot water pipeline 2 in the present invention includes multiple groups of circumferential heating pipes 21, longitudinal heat supply pipes 22, and longitudinal return pipes 23. The multiple groups of circumferential heating pipes 21 are uniformly arranged along the tunnel circumference on the outer side of the secondary lining trolley formwork 7. The shape of the circumferential heating pipe 21 is "spiral" or "continuous U-shaped". The hot water pipeline 2 is uniformly arranged on the secondary lining trolley formwork 7 through multiple groups of circumferential heating pipes 21. The "spiral" or "continuous U-shaped" circumferential heating pipes 21 increase the contact area between the heating pipes and the secondary lining trolley formwork 7, reduce the flow rate of hot water in the heating pipes, and ensure the heat preservation effect on the secondary lining trolley formwork 7.

[0029] Embodiment 3

[0030] Preferably, on the basis of Embodiment 1 or Embodiment 2, in this embodiment, a plurality of temperature sensors 4 are radially arranged on the outer side of the secondary lining trolley formwork 7, and the temperature sensors 4 are connected to the controller 6 through data lines.

[0031] During actual use, the temperature sensor 4 of the present invention is directly buried in the concrete and directly connected to the controller 6 through a data line, so that the temperature of the secondary lining concrete can be detected in real time and the detected data can be transmitted to the controller 6.

[0032] Embodiment 4

[0033] Preferably, on the basis of Embodiment 1 or Embodiment 2 or Embodiment 3, in this embodiment, the temperature sensor 4 is divided into three groups. One group of temperature sensors is located at the center of the arch top of the secondary lining trolley formwork 7, and the other two groups are respectively located on both sides of the arch of the secondary lining trolley formwork 7.

[0034] During actual use, the temperature sensor 4 of the present invention is divided into three groups. One group of temperature sensors is located at the center of the arch top of the secondary lining trolley formwork 7, and the other two groups are respectively located on both sides of the arch of the secondary lining trolley formwork 7, so that the temperature of the entire secondary lining concrete can be detected in real time and accurately, ensuring curing at a set temperature and guaranteeing the quality of concrete curing.

[0035] Embodiment 5

[0036] Preferably, on the basis of Embodiment 1 or Embodiment 2 or Embodiment 3 or Embodiment 4, in this embodiment, as Figure 3 、 Figure 4 shown, the automatic pressurized hot water circulation device 5 includes a total water inlet pipe 51, a pressurizing part 54, a heating part 53, and a hot water outlet pipe 52 connected in sequence. A total water inlet valve 511 is provided on the pipeline between the total water inlet pipe 51 and the pressurizing part 54. A water temperature sensor 531 and a pressure sensor 541 are provided on the pipeline between the hot water outlet pipe 52 and the heating part 53. The water temperature sensor 531 and the pressure sensor 541 are respectively connected to the controller 6 through data lines.

[0037] During actual use, the automatic pressurized hot water circulation device 5 of the present invention can supply pressurized hot water to the hot water pipeline 2 through the heating part 53 and the pressurizing part 54 to directly circulate and heat the trolley formwork. The water temperature sensor 531 and the pressure sensor 541 are respectively connected to the controller 6 through data lines, so that the hot water temperature and water pressure can be detected in real time and the detected data can be transmitted to the controller 6 to ensure that the water temperature and water pressure meet the curing requirements.

[0038] Embodiment 6

[0039] Preferably, on the basis of Embodiment 1 or Embodiment 2 or Embodiment 3 or Embodiment 4 or Embodiment 5, in this embodiment, the water inlet of the hot water pipeline 2 is connected to the hot water outlet pipe 52, the water outlet of the hot water pipeline 2 is connected to the pipeline of the water inlet of the pressurizing part 54, and a one-way valve 521 is provided on the pipeline at the connection between the water outlet of the hot water pipeline 2 and the water inlet of the pressurizing part 54.

[0040] During actual use, a one-way valve 521 is provided on the pipeline at the connection between the water outlet of the hot water pipeline 2 and the water inlet of the pressurization part 54 of the present invention, which can realize the hot water in the hot water pipeline 2 to circulate into the automatic pressurized hot water circulation device 5, improve the heat utilization efficiency and save costs.

[0041] Embodiment 7

[0042] Preferably, on the basis of Embodiment 1, in this embodiment, the pipeline material of the hot water pipeline 2 is a flexible pipe material.

[0043] During actual use, the heating pipeline 2 of the present invention adopts a flexible pipe material, such as a plastic hose. The trolley is arranged in layers from top to bottom and is arranged on the surface curve of the formwork 7 of the secondary lining trolley to achieve the purpose of uniformly heating the formwork 7 of the secondary lining trolley.

[0044] Embodiment 8

[0045] A tunnel heating and curing method uses any one of the above-mentioned automatically heatable tunnel secondary lining trolleys, and includes the following steps:

[0046] S1: After the automatically heatable tunnel secondary lining trolley is in place, the formwork 7 of the secondary lining trolley is positioned by the hydraulic jack 8 according to the construction requirements, and then concrete is poured. The probe of the temperature sensor 4 radially arranged on the outer side of the formwork 7 of the secondary lining trolley contacts the concrete surface;

[0047] S2: After the concrete pouring is completed, there is no need for form removal operation, and the tunnel secondary lining concrete curing is directly carried out. The specific process is as follows: The controller 6 automatically determines whether the temperature detected by the temperature sensor 4 is within the deviation range set for the detected temperature of the secondary lining concrete. If the detected temperature is lower than the minimum negative deviation value of the set secondary lining concrete temperature, the controller 6 controls the heating part 53 of the automatic pressurized hot water circulation device 5 to start working, heats up the hot water in the hot water pipeline 2, and heats and cures the concrete; if the detected concrete temperature reaches the maximum positive deviation value of the set secondary lining concrete detection temperature, the controller 6 controls the heating part 53 of the automatic pressurized hot water circulation device 5 to stop working, and the hot water in the hot water pipeline 2 circulates normally to keep the concrete warm and cured;

[0048] S3: After the concrete heating and heat preservation curing are completed, the hydraulic jack 8 retracts the formwork 7 of the secondary lining trolley, completes the tunnel secondary lining concrete pouring, and the automatically heatable tunnel secondary lining trolley moves to other working surfaces.

[0049] As described above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An automatically heatable secondary lining trolley for tunnels, characterized in that: It includes the secondary lining trolley main body (1), the automatic pressure-boosting hot water circulation device (5) installed on the frame of the secondary lining trolley main body (1), and the controller (6). The outer side of the frame of the secondary lining trolley main body (1) is provided with a secondary lining trolley formwork (7) matching the tunnel contour. The secondary lining trolley formwork (7) is movably connected to the secondary lining trolley main body (1) through a plurality of hydraulic jacks (8). The outer surface of the secondary lining trolley formwork (7) is provided with a heat-insulating layer (3). A hot water pipeline (2) is arranged between the secondary lining trolley formwork (7) and the heat-insulating layer (3). The hot water pipeline (2) is connected to the automatic pressure-boosting hot water circulation device (5). The automatic pressure-boosting hot water circulation device (5) and the controller (6) are connected through a data line. The controller (6) controls the automatic pressure-boosting hot water circulation device (5) to provide circulating hot water for the hot water pipeline (2) to perform heat preservation operation on the secondary lining trolley formwork (7). The hot water pipeline (2) includes multiple groups of circumferential heating pipes (21), longitudinal heat supply pipes (22), and longitudinal return pipes (23). The multiple groups of circumferential heating pipes (21) are uniformly arranged along the tunnel circumference on the outer side of the secondary lining trolley formwork (7). One end of each group of circumferential heating pipes (21) is connected to the longitudinal heat supply pipe (22), and the other end is connected to the longitudinal return pipe (23). The shape of the circumferential heating pipe (21) is a spiral or a continuous U shape. The longitudinal heat supply pipe (22) and the longitudinal return pipe (23) are respectively arranged at the bottoms on both sides of the tunnel trolley and are parallel to the tunnel axis. The automatic pressure-boosting hot water circulation device (5) includes a total water inlet pipe (51), a boosting part (54), a heating part (53), and a hot water outlet pipe (52) connected in sequence. A total water inlet valve (511) is arranged on the pipeline between the total water inlet pipe (51) and the boosting part (54). A water temperature sensor (531) and a pressure sensor (541) are arranged on the pipeline between the hot water outlet pipe (52) and the heating part (53). The water temperature sensor (531) and the pressure sensor (541) are respectively connected to the controller (6) through data lines.

2. The automatic heating type tunnel secondary lining trolley according to claim 1, wherein: A plurality of temperature sensors (4) are radially arranged on the outer side of the secondary lining trolley formwork (7). The temperature sensors (4) are connected to the controller (6) through data lines.

3. The automatic heating type tunnel secondary lining trolley according to claim 2, wherein: The temperature sensors (4) are divided into three groups. One group of temperature sensors is located at the center of the arched top of the secondary lining trolley formwork (7), and the other two groups are respectively located on both sides of the arch of the secondary lining trolley formwork (7).

4. The automatic heating type tunnel secondary lining jumbo according to claim 1, characterized in that: The water inlet of the hot water pipeline (2) is connected to the hot water outlet pipe (52). The water outlet of the hot water pipeline (2) is connected to the pipeline of the water inlet of the boosting part (54). A one-way valve (521) is arranged on the pipeline at the connection of the water outlet of the hot water pipeline (2) and the water inlet of the boosting part (54).

5. The automatic heating type tunnel secondary lining jumbo according to claim 1, wherein: The pipeline material of the hot water pipeline (2) adopts a flexible pipe material.

6. A tunnel heating and curing method, using any one of the tunnel secondary lining trolleys capable of automatic heating as described above, characterized in that: It includes the following steps: S1: After the automatically heatable tunnel secondary lining trolley is in place, the formwork (7) of the secondary lining trolley is positioned by hydraulic jacks (8) according to construction requirements, and then concrete is poured. The probe of the temperature sensor (4) radially arranged on the outer side of the formwork (7) of the secondary lining trolley contacts the concrete surface; S2: After the concrete pouring is completed, the tunnel secondary lining concrete curing is directly carried out without formwork removal operation. The specific process is as follows: The controller (6) automatically determines whether the temperature detected by the temperature sensor (4) is within the deviation range set for the detected temperature of the secondary lining concrete. If the detected temperature is lower than the minimum negative deviation value of the set secondary lining concrete temperature, the controller (6) controls the heating part (53) of the automatic pressurized hot water circulation device (5) to start working, heats up the hot water in the hot water pipeline (2), and cures the concrete by heating; If the detected concrete temperature reaches the maximum positive deviation value of the set secondary lining concrete detection temperature, the controller (6) controls the heating part (53) of the automatic pressurized hot water circulation device (5) to stop working, and the hot water in the hot water pipeline (2) circulates normally to cure the concrete by heat preservation; S3: After the concrete heating and heat preservation curing are completed, the hydraulic jacks (8) retract the formwork (7) of the secondary lining trolley, complete the tunnel secondary lining concrete pouring, and the automatically heatable tunnel secondary lining trolley is shifted to other working faces.

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