Construction method of tunnel secondary lining structure

Abstract

The invention discloses a construction method of a tunnel secondary lining structure. The construction method comprises the following steps: (1) obtaining a standard cross-section diagram of a tunnel primary lining; (2) positioning pieces are arranged at the corresponding positions of the surface of the primary lining with the tunnel axis and the arch camber lines on the left side and the right side of the tunnel as references; (3) the posture of a secondary lining trolley is preliminarily adjusted outside the tunnel, so that the posture is basically matched with the structural line type of the primary lining of the tunnel; (4) mounting a prefabricated secondary lining template on the secondary lining trolley, and mounting a reinforcing steel bar net rack of a secondary lining structure on the secondary lining template; (5) moving the secondary lining trolley into the tunnel in place, and accurately adjusting the final posture of the secondary lining trolley, so that the reinforcing steel bar net rack and the secondary lining template are positioned at designed positions; (6) making construction preparation for pouring secondary lining concrete; (7) secondary lining concrete pouring construction is carried out; and (8) detecting the quality of secondary lining construction. According to the method, many problems existing in tunnel secondary lining construction in the prior art can be solved, the construction quality and efficiency are guaranteed, and maximization of construction economic benefits is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering construction, and in particular to a construction method for a tunnel secondary lining structure. Background Art

[0002] my country is in a period of vigorously developing infrastructure construction, and there are still many tunnels under construction and unbuilt. In tunnel construction, excavation and support are the primary processes of quality control, and the secondary lining construction is particularly important. The secondary lining of the tunnel plays a role in the beauty of the tunnel, supporting the surrounding rock, and supporting the stress reserve of the structure. The quality of the secondary lining construction is one of the key factors affecting the overall construction quality and beauty of the tunnel.

[0003] During the construction of the secondary lining, due to various reasons such as construction technology, the secondary lining often has problems such as difficulty in steel bar binding, difficulty in formwork support, inadequate concrete pouring, and mechanical and waterproof properties of the secondary lining structure joints that do not meet the design requirements. These problems have seriously affected the construction quality and progress of the tunnel secondary lining structure. Moreover, after the construction of the secondary lining, it is necessary to promptly detect the construction quality of the tunnel secondary lining, treat the defects in the tunnel secondary lining, and ensure the safe operation of the tunnel. Summary of the invention

[0004] In order to solve the defects in the prior art, the present invention provides a construction method for a tunnel secondary lining structure. The present invention can solve many problems existing in the prior art in tunnel secondary lining construction, ensure construction quality and efficiency, and maximize the economic benefits of construction.

[0005] To achieve the above object, the present invention provides a construction method for a tunnel secondary lining structure, comprising the following steps:

[0006] (1) Scan and measure the three-dimensional coordinates of the surface of the tunnel primary lining to obtain a standard cross-sectional view of the tunnel primary lining;

[0007] (2) According to the standard cross-section of the tunnel primary lining, positioning pieces are set at corresponding positions on the surface of the primary lining with the tunnel axis and the arch lines on the left and right sides of the tunnel as references;

[0008] (3) Outside the tunnel, preliminarily adjust the posture of the secondary lining trolley according to the standard cross-section diagram of the tunnel primary lining so that it basically matches the structural line shape of the tunnel primary lining;

[0009] (4) Install the prefabricated secondary lining formwork on the secondary lining trolley, and install the steel mesh frame of the secondary lining structure on the secondary lining formwork;

[0010] (5) moving the secondary lining trolley in step (4) into position in the tunnel, and accurately adjusting the final posture of the secondary lining trolley again according to the standard cross-section diagram of the primary lining of the tunnel, so that the steel mesh frame and the secondary lining formwork are in the designed position;

[0011] (6) The steel grid, the secondary lining formwork and the positioning member are fixedly connected to prepare for pouring the secondary lining concrete;

[0012] (7) Carry out pouring of secondary lining concrete;

[0013] (8) Carry out quality inspection of secondary lining construction.

[0014] Preferably, in the step (1), during the scanning measurement, the three-dimensional laser scanning imaging system is first debugged, and the design data of the tunnel primary lining is input into the system, including but not limited to the curvature, turning angle, and surface flatness. Then, a measuring station is established, and the three-dimensional laser scanning imaging system is used to scan the tunnel primary lining structure. After the scanning is completed, it is confirmed that there is no missed scan, the scanning data is exported, and the data is calculated to obtain the three-dimensional coordinates of the surface of the tunnel primary lining; and the standard cross-sectional view of the tunnel primary lining is obtained through coordinate system calculation processing.

[0015] In any of the above schemes, it is preferred that in step (2), the positioning member is embedded in the primary lining surface of the tunnel, and its position corresponds to the connection position between each adjacent steel mesh frame and each adjacent secondary lining formwork after the final posture of the secondary lining trolley is accurately adjusted in the subsequent step (5).

[0016] In any of the above schemes, it is preferred that in step (2), the positioning members are respectively arranged at the junction of the bottom arch and the side wall of the tunnel, the junction of the side wall and the two ends of the tunnel top arc, and the junction of the two ends of the tunnel top arc and the middle of the tunnel top arc, and the length of the middle of the tunnel top arc and the two ends of the tunnel top arc each accounts for 1 / 3 of the overall tunnel top arc.

[0017] In any of the above schemes, it is preferred that in step (3), based on the standard cross-sectional view of the primary tunnel lining, the posture of the secondary lining trolley is preliminarily adjusted with the aid of data from a three-dimensional laser scanning imaging system so that the degree of coincidence between the secondary lining trolley and the structural line shape of the primary tunnel lining reaches more than 80%.

[0018] In any of the above schemes, it is preferred that in step (4), the secondary lining formworks corresponding to the side walls of the tunnel, the two ends of the top arc and the middle of the top arc of the tunnel are temporarily fixed on the supporting trusses of the secondary lining trolley, and it is ensured that the secondary lining formworks at the above positions are not connected as a whole; and concrete pouring sleeves are arranged at the adjacent ends of the secondary lining formworks.

[0019] In any of the above schemes, it is preferred that in step (5), the tunnel invert is first constructed, and after the construction is completed, the secondary lining trolley is moved into position in the tunnel; according to the standard cross-sectional view of the tunnel primary lining, the data of the three-dimensional laser scanning imaging system is used again to accurately adjust the posture of the secondary lining trolley so that it is completely consistent with the structural line shape of the tunnel primary lining, and ensure that the steel mesh and the secondary lining formwork are in the designed position.

[0020] In any of the above schemes, it is preferred that in the step (6), after the steel mesh frame and the second lining formwork are fixedly connected to the positioning member respectively, the gap between adjacent formworks is waterproofly sealed.

[0021] In any of the above schemes, it is preferred that in step (7), when pouring concrete, the pouring pressure is controlled by an intelligent pressure monitoring device, and the poured concrete is C50P10 waterproof concrete.

[0022] In any of the above schemes, it is preferred that in step (8), after the secondary lining trolley is withdrawn and the secondary lining template is removed, an intelligent scanning device is used to perform quality inspection of the secondary lining structure. The intelligent scanning device mainly includes a remote-controlled aircraft and a manual control unit. The remote-controlled aircraft is provided with a trajectory positioning module to ensure that the remote-controlled aircraft can maintain a fixed distance from the secondary lining surface and cover its entire surface when performing quality inspection on the secondary lining structure.

[0023] Beneficial effects of the present invention:

[0024] 1. The present invention can accurately ensure that the steel grid and formwork of the secondary lining are in place by matching the standard cross-section diagram of the tunnel primary lining with the posture of the secondary lining trolley and using two posture adjustments of the secondary lining trolley, and can complete the positioning conveniently and effectively in a short time, with strong operability and higher construction efficiency; and can accurately control the structural thickness and quality of the tunnel secondary lining, save the amount of concrete to the greatest extent, and maximize the economic benefits of construction production.

[0025] 2. The present invention obtains a standard cross-sectional diagram of the tunnel by scanning and measuring the tunnel structure, and strictly controls the accuracy of various data. It has the advantages of high construction efficiency, accurate measurement, and greatly guarantees construction quality.

[0026] 3. The present invention effectively solves the problems of difficulty in erecting the secondary lining formwork in the tunnel and inability to ensure the quality of concrete pouring; it not only ensures the formwork and pouring quality of the secondary lining, but also avoids pollution of the construction site and improves the construction progress. DETAILED DESCRIPTION

[0027] The technical solution of the present application will be described in detail below in conjunction with the specific implementation methods of the present application, but the following examples are only for understanding the present invention. The embodiments in the present application and the features in the embodiments can be combined with each other, and the present application can be implemented in a variety of different ways as defined and covered by the claims.

[0028] Example 1

[0029] A construction method for a tunnel secondary lining structure comprises the following steps:

[0030] (1) Scan and measure the three-dimensional coordinates of the surface of the tunnel primary lining to obtain a standard cross-sectional view of the tunnel primary lining;

[0031] (2) According to the standard cross-section of the tunnel primary lining, positioning pieces are set at corresponding positions on the surface of the primary lining with the tunnel axis and the arch lines on the left and right sides of the tunnel as references;

[0032] (3) Outside the tunnel, preliminarily adjust the posture of the secondary lining trolley according to the standard cross-section diagram of the tunnel primary lining so that it basically matches the structural line shape of the tunnel primary lining;

[0033] (4) Install the prefabricated secondary lining formwork on the secondary lining trolley, and install the steel mesh frame of the secondary lining structure on the secondary lining formwork;

[0034] (5) moving the secondary lining trolley in step (4) into position in the tunnel, and accurately adjusting the final posture of the secondary lining trolley again according to the standard cross-section diagram of the primary lining of the tunnel, so that the steel mesh frame and the secondary lining formwork are in the designed position;

[0035] (6) The steel grid, the secondary lining formwork and the positioning member are fixedly connected to prepare for pouring the secondary lining concrete;

[0036] (7) Carry out pouring of secondary lining concrete;

[0037] (8) Carry out quality inspection of secondary lining construction.

[0038] In the step (1), during the scanning measurement, the three-dimensional laser scanning imaging system is first debugged, and the design data of the tunnel primary lining is input into the system, including but not limited to the curvature, turning angle, and surface flatness. Then, a measuring station is established, and the three-dimensional laser scanning imaging system is used to scan the tunnel primary lining structure. After the scanning is completed, it is confirmed that there is no missed scanning, the scanning data is exported, and the data is calculated to obtain the three-dimensional coordinates of the surface of the tunnel primary lining; and the standard cross-sectional view of the tunnel primary lining is obtained through coordinate system calculation processing.

[0039] In step (2), the positioning member is embedded in the primary lining surface of the tunnel, and its position corresponds to the connection position between each adjacent steel mesh frame and each adjacent secondary lining formwork after the final posture of the secondary lining trolley is accurately adjusted in the subsequent step (5).

[0040] In step (2), the positioning members are respectively arranged at the junction of the bottom invert arch and the side wall of the tunnel, the junction of the side wall and the two ends of the tunnel top arc, and the junction of the two ends of the tunnel top arc and the middle of the tunnel top arc. The length of the middle of the tunnel top arc and the two ends of the tunnel top arc each accounts for 1 / 3 of the entire tunnel top arc.

[0041] In step (3), based on the standard cross-section of the tunnel primary lining and using the data from the 3D laser scanning imaging system, the posture of the secondary lining trolley is preliminarily adjusted so that the degree of coincidence between the secondary lining trolley and the structural line shape of the tunnel primary lining reaches 80%.

[0042] In the step (4), the secondary lining formworks corresponding to the side walls of the tunnel, the two ends of the top arc and the middle of the top arc of the tunnel are temporarily fixed on the supporting trusses of the secondary lining trolley, and it is ensured that the secondary lining formworks at the above positions are not connected as a whole; and concrete pouring sleeves are arranged at the adjacent ends of the secondary lining formworks.

[0043] In the step (5), the tunnel invert is first constructed, and after the construction is completed, the secondary lining trolley is moved into position in the tunnel; according to the standard cross-sectional view of the tunnel primary lining, the data of the three-dimensional laser scanning imaging system is used again to accurately adjust the posture of the secondary lining trolley so that it is completely consistent with the structural line shape of the tunnel primary lining, and ensure that the steel mesh and the secondary lining formwork are in the designed position.

[0044] In the step (6), after the steel mesh frame and the second lining formwork are fixedly connected to the positioning member, the gap between adjacent formworks is waterproofly sealed.

[0045] In the step (7), the pouring pressure of the concrete is controlled by an intelligent pressure monitoring device, and the poured concrete is C50P10 waterproof concrete.

[0046] In the step (8), after the secondary lining trolley is removed and the secondary lining template is dismantled, an intelligent scanning device is used to perform a quality inspection of the secondary lining structure. The intelligent scanning device mainly includes a remote-controlled aircraft and a hand-controlled unit. The remote-controlled aircraft is provided with a track positioning module to ensure that the remote-controlled aircraft can maintain a fixed distance from the secondary lining surface and cover its entire surface when performing quality inspection on the secondary lining structure.

[0047] Example 2

[0048] A construction method for a tunnel secondary lining structure comprises the following steps:

[0049] (1) Scan and measure the three-dimensional coordinates of the surface of the tunnel primary lining to obtain a standard cross-sectional view of the tunnel primary lining;

[0050] (2) According to the standard cross-section of the tunnel primary lining, positioning pieces are set at corresponding positions on the surface of the primary lining with the tunnel axis and the arch lines on the left and right sides of the tunnel as references;

[0051] (3) Outside the tunnel, preliminarily adjust the posture of the secondary lining trolley according to the standard cross-section diagram of the tunnel primary lining so that it basically matches the structural line shape of the tunnel primary lining;

[0052] (4) Install the prefabricated secondary lining formwork on the secondary lining trolley, and install the steel mesh frame of the secondary lining structure on the secondary lining formwork;

[0053] (5) moving the secondary lining trolley in step (4) into position in the tunnel, and accurately adjusting the final posture of the secondary lining trolley again according to the standard cross-section diagram of the primary lining of the tunnel, so that the steel mesh frame and the secondary lining formwork are in the designed position;

[0054] (6) The steel grid, the secondary lining formwork and the positioning member are fixedly connected to prepare for pouring the secondary lining concrete;

[0055] (7) Carry out pouring of secondary lining concrete;

[0056] (8) Carry out quality inspection of secondary lining construction.

[0057] In the step (1), during the scanning measurement, the three-dimensional laser scanning imaging system is first debugged, and the design data of the tunnel primary lining is input into the system, including but not limited to the curvature, turning angle, and surface flatness. Then, a measuring station is established, and the three-dimensional laser scanning imaging system is used to scan the tunnel primary lining structure. After the scanning is completed, it is confirmed that there is no missed scanning, the scanning data is exported, and the data is calculated to obtain the three-dimensional coordinates of the surface of the tunnel primary lining; and the standard cross-sectional view of the tunnel primary lining is obtained through coordinate system calculation processing.

[0058] In step (2), the positioning member is embedded in the primary lining surface of the tunnel, and its position corresponds to the connection position between each adjacent steel mesh frame and each adjacent secondary lining formwork after the final posture of the secondary lining trolley is accurately adjusted in the subsequent step (5).

[0059] In step (2), the positioning members are respectively arranged at the junction of the bottom invert arch and the side wall of the tunnel, the junction of the side wall and the two ends of the tunnel top arc, and the junction of the two ends of the tunnel top arc and the middle of the tunnel top arc. The length of the middle of the tunnel top arc and the two ends of the tunnel top arc each accounts for 1 / 3 of the entire tunnel top arc.

[0060] In step (3), based on the standard cross-section of the tunnel primary lining and using the data from the 3D laser scanning imaging system, the posture of the secondary lining trolley is preliminarily adjusted so that the degree of coincidence between the secondary lining trolley and the structural line shape of the tunnel primary lining reaches 85%.

[0061] In the step (4), the secondary lining formworks corresponding to the side walls of the tunnel, the two ends of the top arc and the middle of the top arc of the tunnel are temporarily fixed on the supporting trusses of the secondary lining trolley, and it is ensured that the secondary lining formworks at the above positions are not connected as a whole; and concrete pouring sleeves are arranged at the adjacent ends of the secondary lining formworks.

[0062] In the step (5), the tunnel invert is first constructed, and after the construction is completed, the secondary lining trolley is moved into position in the tunnel; according to the standard cross-sectional view of the tunnel primary lining, the data of the three-dimensional laser scanning imaging system is used again to accurately adjust the posture of the secondary lining trolley so that it is completely consistent with the structural line shape of the tunnel primary lining, and ensure that the steel mesh and the secondary lining formwork are in the designed position.

[0063] In the step (6), after the steel mesh frame and the second lining formwork are fixedly connected to the positioning member, the gap between adjacent formworks is waterproofly sealed.

[0064] In the step (7), the pouring pressure of the concrete is controlled by an intelligent pressure monitoring device, and the poured concrete is C50P10 waterproof concrete.

[0065] In the step (8), after the secondary lining trolley is removed and the secondary lining template is dismantled, an intelligent scanning device is used to perform a quality inspection of the secondary lining structure. The intelligent scanning device mainly includes a remote-controlled aircraft and a hand-controlled unit. The remote-controlled aircraft is provided with a track positioning module to ensure that the remote-controlled aircraft can maintain a fixed distance from the secondary lining surface and cover its entire surface when performing quality inspection on the secondary lining structure.

[0066] In addition, in order to further improve the technical effect of the present invention, in this embodiment, the positioning members are evenly spaced at the junction of the bottom invert and the side wall of the tunnel, the junction of the side wall and the two ends of the tunnel top arc, and the junction of the two ends of the tunnel top arc and the middle of the tunnel top arc. Each positioning member includes a reinforcement rod, one end of which is embedded in the tunnel primary lining structure, and the reinforcement rod exposed outside the tunnel primary lining structure is provided with multiple layers of support rods, the multiple layers of support rods are all arranged obliquely upward, the bottom layer of support rods is clamped with the second lining template, and the other layers of support rods are connected and fixed to the steel mesh frame. A waterproof coil is arranged on the positioning member, and the positioning member is a steel structure.

[0067] The above-mentioned setting of the positioning parts, in addition to playing a positioning and fixing role when installing the steel mesh and the secondary lining formwork, can also improve the shear resistance of the steel mesh and the secondary lining formwork during the construction process, and enhance the overall shear resistance of the secondary lining structure after pouring concrete to form the secondary lining structure. When the tunnel is subjected to external force, the setting of the positioning parts can resist the shear destructive force generated by the external force on the secondary lining structure. The waterproof membrane set on the positioning parts and the gap between adjacent formworks for waterproof sealing can be used to prevent water seepage, enhance the waterproof performance of the secondary lining structure, and effectively block the lateral migration of moisture at the concrete construction joints. This prevents cracks in the concrete due to water seepage when pouring concrete, further ensuring the overall strength of the secondary lining structure.

[0068] The intelligent pressure monitoring device includes a plurality of pressure sensing units arranged on the secondary lining formwork, which are arranged in a direction perpendicular to the tunnel depth direction, a remote transmitting unit connected to the pressure sensing unit, and a remote control receiving unit for receiving the signal of the remote transmitting unit. Through this arrangement, it is ensured that the monitoring pressure can be obtained in real time and accurately. The intelligent pressure monitoring device also includes a core processing unit connected to the remote control receiving unit, which can convert the pressure value into the density of the tunnel secondary lining concrete. After the core processing unit receives the pressure value measured by the pressure sensing unit, the pressure value is converted into the density of the tunnel secondary lining concrete. As a result, construction technicians can more clearly and intuitively obtain the construction status of the tunnel secondary lining. As long as the monitoring pressure shown by the pressure sensing unit reaches the design pressure, it can be judged that the density of the lining concrete meets the design requirements. Therefore, the pressure value of the secondary lining concrete during the construction process can be easily obtained, which helps to conveniently and accurately judge whether the construction of the secondary lining concrete meets the design requirements.

[0069] The method of this embodiment makes the secondary lining construction more flexible, reduces the amount of engineering work, and is conducive to controlling tunnel deformation; reduces the number of times the arch frame is dismantled, transported, and assembled, which is convenient and fast, and significantly saves construction time; significantly reduces labor consumption, and greatly reduces the risk of safety accidents such as object impact in a confined space.

[0070] Example 3

[0071] A construction method for a tunnel secondary lining structure comprises the following steps:

[0072] (1) Scan and measure the three-dimensional coordinates of the surface of the tunnel primary lining to obtain a standard cross-sectional view of the tunnel primary lining;

[0073] (2) According to the standard cross-section of the tunnel primary lining, positioning pieces are set at corresponding positions on the surface of the primary lining with the tunnel axis and the arch lines on the left and right sides of the tunnel as references;

[0074] (3) Outside the tunnel, preliminarily adjust the posture of the secondary lining trolley according to the standard cross-section diagram of the tunnel primary lining so that it basically matches the structural line shape of the tunnel primary lining;

[0075] (4) Install the prefabricated secondary lining formwork on the secondary lining trolley, and install the steel mesh frame of the secondary lining structure on the secondary lining formwork;

[0076] (5) moving the secondary lining trolley in step (4) into position in the tunnel, and accurately adjusting the final posture of the secondary lining trolley again according to the standard cross-section diagram of the primary lining of the tunnel, so that the steel mesh frame and the secondary lining formwork are in the designed position;

[0077] (6) The steel grid, the secondary lining formwork and the positioning member are fixedly connected to prepare for pouring the secondary lining concrete;

[0078] (7) Carry out pouring of secondary lining concrete;

[0079] (8) Carry out quality inspection of secondary lining construction.

[0080] In the step (1), during the scanning measurement, the three-dimensional laser scanning imaging system is first debugged, and the design data of the tunnel primary lining is input into the system, including but not limited to the curvature, turning angle, and surface flatness. Then, a measuring station is established, and the three-dimensional laser scanning imaging system is used to scan the tunnel primary lining structure. After the scanning is completed, it is confirmed that there is no missed scanning, the scanning data is exported, and the data is calculated to obtain the three-dimensional coordinates of the surface of the tunnel primary lining; and the standard cross-sectional view of the tunnel primary lining is obtained through coordinate system calculation processing.

[0081] In step (2), the positioning member is embedded in the primary lining surface of the tunnel, and its position corresponds to the connection position between each adjacent steel mesh frame and each adjacent secondary lining formwork after the final posture of the secondary lining trolley is accurately adjusted in the subsequent step (5).

[0082] In step (2), the positioning members are respectively arranged at the junction of the bottom invert arch and the side wall of the tunnel, the junction of the side wall and the two ends of the tunnel top arc, and the junction of the two ends of the tunnel top arc and the middle of the tunnel top arc. The length of the middle of the tunnel top arc and the two ends of the tunnel top arc each accounts for 1 / 3 of the entire tunnel top arc.

[0083] In step (3), based on the standard cross-section of the tunnel primary lining and using the data from the 3D laser scanning imaging system, the posture of the secondary lining trolley is preliminarily adjusted so that the degree of coincidence between the secondary lining trolley and the structural line shape of the tunnel primary lining reaches 88%.

[0084] In the step (4), the secondary lining formworks corresponding to the side walls of the tunnel, the two ends of the top arc and the middle of the top arc of the tunnel are temporarily fixed on the supporting trusses of the secondary lining trolley, and it is ensured that the secondary lining formworks at the above positions are not connected as a whole; and concrete pouring sleeves are arranged at the adjacent ends of the secondary lining formworks.

[0085] In the step (5), the tunnel invert is first constructed, and after the construction is completed, the secondary lining trolley is moved into position in the tunnel; according to the standard cross-sectional view of the tunnel primary lining, the data of the three-dimensional laser scanning imaging system is used again to accurately adjust the posture of the secondary lining trolley so that it is completely consistent with the structural line shape of the tunnel primary lining, and ensure that the steel mesh and the secondary lining formwork are in the designed position.

[0086] In the step (6), after the steel mesh frame and the second lining formwork are fixedly connected to the positioning member, the gap between adjacent formworks is waterproofly sealed.

[0087] In the step (7), the pouring pressure of the concrete is controlled by an intelligent pressure monitoring device, and the poured concrete is C50P10 waterproof concrete.

[0088] In the step (8), after the secondary lining trolley is removed and the secondary lining template is dismantled, an intelligent scanning device is used to perform a quality inspection of the secondary lining structure. The intelligent scanning device mainly includes a remote-controlled aircraft and a hand-controlled unit. The remote-controlled aircraft is provided with a track positioning module to ensure that the remote-controlled aircraft can maintain a fixed distance from the secondary lining surface and cover its entire surface when performing quality inspection on the secondary lining structure.

[0089] In addition, in order to further improve the technical effect of the present invention, in the embodiment, in the step (8), the remote control aircraft is 5-8 cm away from the surface of the second lining when performing quality inspection, and the movement of the remote control aircraft is controlled by the hand control unit. When the trajectory positioning module detects that the distance between the remote control aircraft and the surface of the second lining reaches the designed distance, the remote control aircraft is ensured to brake. Then, the hand control unit issues a command to control the remote control aircraft to reach the starting position of the inspection trajectory, and then moves at a uniform speed along the designed flight trajectory to perform scanning inspection along the depth direction or along the arc direction of the second lining; the above control method is repeated until the flight inspection of the entire surface of the second lining is completed.

[0090] The method of this embodiment realizes convenient, fast and accurate scanning during the quality inspection of the tunnel secondary lining, saving a lot of manpower, improving work efficiency and saving costs; it avoids the occupation of tunnel space during inspection and does not affect the normal construction of the tunnel. This intelligent scanning equipment has low cost, good effect and easy operation. Automation improves construction accuracy and construction safety. It can be applied to the real-time and accurate detection of surface cracks, water seepage, concrete density and other conditions of the tunnel structure to ensure the quality of tunnel construction.

[0091] It can be seen from the above embodiments that the present invention can accurately ensure that the steel grid and formwork of the secondary lining are in place by matching the standard cross-sectional diagram of the tunnel primary lining with the posture of the secondary lining trolley and using two posture adjustments of the secondary lining trolley, and can complete the positioning conveniently and effectively in a short time, with strong operability and higher construction efficiency; and can accurately control the structural thickness and quality of the tunnel secondary lining, save the amount of concrete to the greatest extent, and maximize the economic benefits of construction production.

[0092] The present invention obtains a standard cross-sectional diagram of the tunnel by scanning and measuring the tunnel structure, and strictly controls the accuracy of various data. It has the advantages of high construction efficiency, accurate measurement, and greatly guarantees construction quality.

[0093] The present invention effectively solves the problems of difficulty in erecting secondary lining formwork in a tunnel and inability to ensure the quality of concrete pouring; it not only ensures the formwork and pouring quality of the secondary lining, but also avoids pollution of the construction site and improves the construction progress.

[0094] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A construction method for a tunnel secondary lining structure, characterized in that: The following steps are involved: (1) Scan and measure the three-dimensional coordinates of the surface of the tunnel primary lining to obtain a standard cross-sectional view of the tunnel primary lining; (2) According to the standard cross-section of the tunnel primary lining, positioning pieces are set at corresponding positions on the surface of the primary lining with the tunnel axis and the arch lines on the left and right sides of the tunnel as references; (3) Outside the tunnel, preliminarily adjust the posture of the secondary lining trolley according to the standard cross-section diagram of the tunnel primary lining so that it basically matches the structural line shape of the tunnel primary lining; (4) Install the prefabricated secondary lining formwork on the secondary lining trolley, and install the steel mesh frame of the secondary lining structure on the secondary lining formwork; (5) moving the secondary lining trolley in step (4) into position in the tunnel, and accurately adjusting the final posture of the secondary lining trolley again according to the standard cross-section diagram of the primary lining of the tunnel, so that the steel mesh frame and the secondary lining formwork are in the designed position; (6) The steel grid, the secondary lining formwork and the positioning member are fixedly connected to prepare for pouring the secondary lining concrete; (7) Carry out pouring of secondary lining concrete; (8) Carry out quality inspection of secondary lining construction.

2. The construction method of the tunnel secondary lining structure according to claim 1, characterized in that: In the step (1), during the scanning measurement, the three-dimensional laser scanning imaging system is first debugged, and the design data of the tunnel primary lining is input into the system, including but not limited to the curvature, turning angle, and surface flatness. Then, a measuring station is established, and the three-dimensional laser scanning imaging system is used to scan the tunnel primary lining structure. After the scanning is completed, it is confirmed that there is no missed scanning, the scanning data is exported, and the data is calculated to obtain the three-dimensional coordinates of the surface of the tunnel primary lining; and the standard cross-sectional view of the tunnel primary lining is obtained through coordinate system calculation processing.

3. The construction method of the tunnel secondary lining structure according to claim 1 or 2, characterized in that: In step (2), the positioning member is embedded in the primary lining surface of the tunnel, and its position corresponds to the connection position between each adjacent steel mesh frame and each adjacent secondary lining formwork after the final posture of the secondary lining trolley is accurately adjusted in the subsequent step (5).

4. The construction method of the tunnel secondary lining structure according to claim 3 is characterized in that: In step (2), the positioning members are respectively arranged at the junction of the bottom invert arch and the side wall of the tunnel, the junction of the side wall and the two ends of the tunnel top arc, and the junction of the two ends of the tunnel top arc and the middle of the tunnel top arc. The length of the middle of the tunnel top arc and the two ends of the tunnel top arc each accounts for 1 / 3 of the entire tunnel top arc.

5. The construction method of the tunnel secondary lining structure according to claim 4, characterized in that: In step (3), based on the standard cross-section of the tunnel primary lining and using the data from the 3D laser scanning imaging system, the posture of the secondary lining trolley is preliminarily adjusted so that the degree of coincidence between the secondary lining trolley and the structural line shape of the tunnel primary lining reaches more than 80%.

6. The construction method of the tunnel secondary lining structure according to claim 4 or 5, characterized in that: In the step (4), the secondary lining formworks corresponding to the side walls of the tunnel, the two ends of the top arc and the middle of the top arc of the tunnel are temporarily fixed on the supporting trusses of the secondary lining trolley, and it is ensured that the secondary lining formworks at the above positions are not connected as a whole; and concrete pouring sleeves are arranged at the adjacent ends of the secondary lining formworks.

7. The construction method of the tunnel secondary lining structure according to claim 6, characterized in that: In the step (5), the tunnel invert is first constructed, and after the construction is completed, the secondary lining trolley is moved into position in the tunnel; according to the standard cross-sectional view of the tunnel primary lining, the data of the three-dimensional laser scanning imaging system is used again to accurately adjust the posture of the secondary lining trolley so that it is completely consistent with the structural line shape of the tunnel primary lining, and ensure that the steel mesh and the secondary lining formwork are in the designed position.

8. The construction method of the tunnel secondary lining structure according to claim 7, characterized in that: In the step (6), after the steel mesh frame and the second lining formwork are fixedly connected to the positioning member, the gap between adjacent formworks is waterproofly sealed.

9. The construction method of the tunnel secondary lining structure according to claim 7 or 8, characterized in that: In the step (7), the pouring pressure of the concrete is controlled by an intelligent pressure monitoring device, and the poured concrete is C50P10 waterproof concrete.

10. The construction method of the tunnel secondary lining structure according to claim 9, characterized in that: In the step (8), after the secondary lining trolley is removed and the secondary lining template is dismantled, an intelligent scanning device is used to perform a quality inspection of the secondary lining structure. The intelligent scanning device mainly includes a remote-controlled aircraft and a hand-controlled unit. The remote-controlled aircraft is provided with a track positioning module to ensure that the remote-controlled aircraft can maintain a fixed distance from the secondary lining surface and cover its entire surface when performing quality inspection on the secondary lining structure.