A tunnel lining maintenance trolley and a structural defect repair method

Abstract

The present invention discloses a tunnel lining maintenance trolley and a method for repairing structural defects, comprising a trolley frame, beams symmetrically arranged on both sides of the bottom of the trolley frame, a travel power system arranged on the bottom of the beam, and a slide rail arranged on the top; and a plurality of folding arc steel support mechanisms, a retractable arc maintenance support mechanism and an arc rail vehicle maintenance mechanism adapted to the shape of the tunnel are arranged on the trolley frame, and the retractable arc maintenance support mechanism and the arc rail vehicle maintenance mechanism are slidably connected with the slide rail. The present invention has a simple structure, flexible and convenient operation, and strong operability. Through the mutual cooperation of various components, and the flexible switching of the working forms of multiple components, the structural defects at any position of the tunnel lining can be repaired, which can greatly improve the work efficiency of tunnel lining structural defect repair, shorten the construction period, reduce financial and time investment, and has strong practicality.

Description

Technical Field

[0001] The invention relates to a tunnel lining maintenance trolley and a structural defect repairing method, belonging to the technical field of tunnel structural defect maintenance. Background Art

[0002] Most existing tunnels use composite linings, among which the secondary lining is the last line of defense of the tunnel structure, and its quality level is extremely important to the safety of tunnel operation. However, there are quality defects such as insufficient strength, honeycombed surface or severe aggregate segregation, and insufficient structural thickness in the secondary lining due to factors such as unqualified concrete materials and improper concrete pouring construction. At the same time, affected by the tunnel operation environment, concrete structures that have been working for a long time also have defects such as carbonization, cracking or web cracking. Once the secondary lining has the above-mentioned situation, if it cannot be treated and repaired in a timely and effective manner, it will inevitably leave safety hazards to the reliability of the tunnel structure.

[0003] For the problem of secondary lining defects in tunnels, the simplest and most commonly used repair measures are to reinforce the surface of the structure or grouting the cracks in the structure. This method has a good repair effect when the defects are relatively mild, but it cannot effectively deal with relatively serious structural defects. Another more conservative measure is to dismantle and rebuild the concrete structure of the defective part. This solution can relatively thoroughly cure the structural defects, but the construction difficulty of the dismantling process is relatively high and the construction risk is high. At present, there is still a lack of professional construction auxiliary trolleys in the field of secondary lining structure replacement construction, resulting in low efficiency and poor operability of secondary lining replacement construction, and there are great construction safety hazards. In view of the above considerations, the study of a tunnel lining maintenance trolley and a structural defect repair method has become an urgent problem to be solved in the engineering community. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a tunnel lining maintenance trolley and a structural defect repair method, which can overcome the shortcomings of the prior art.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A tunnel lining maintenance trolley comprises a trolley frame, cross beams symmetrically arranged on both sides of the bottom of the trolley frame, a travel power system arranged on the bottom of the cross beams, and slide rails arranged on the top; and a plurality of folding arc steel support mechanisms adapted to the shape of the tunnel, a retractable arc maintenance support mechanism and an arc rail vehicle maintenance mechanism are arranged on the trolley frame, and the retractable arc maintenance support mechanism and the arc rail vehicle maintenance mechanism are slidably connected to the slide rails.

[0007] The aforementioned travel power system, foldable arc-shaped steel support mechanism, retractable arc-shaped maintenance support mechanism and arc-shaped rail vehicle maintenance mechanism are all connected to the remote controller by telecommunication.

[0008] It also includes a telescopic expansion foundation, which is a plurality of groups and is symmetrically arranged at the bottom of the trolley frame, both sides of the foldable arc-shaped steel support mechanism, and the middle and both ends of the bottom surface of the crossbeam.

[0009] The aforementioned trolley frame includes multiple gantries similar to the shape of the tunnel, the gantries include a front gantry and a rear gantry relatively arranged at the front and rear ends, a middle gantry is provided between the front gantry and the rear gantry, and the front gantry, the middle gantry and the rear gantry are connected to each other by cross bars.

[0010] The aforementioned slide rails are at least two arranged on the crossbeam along the longitudinal direction of the tunnel, and are symmetrically arranged on the top surfaces of the crossbeam on the left and right sides of the trolley frame; the telescopic arc maintenance support mechanism and the arc rail vehicle maintenance mechanism are respectively arranged on different slide rails, and the radius of the arc rail vehicle maintenance mechanism is slightly smaller than that of the telescopic arc maintenance support mechanism, so that the two are staggered in space to achieve mutual staggered movement.

[0011] The aforementioned foldable arc-shaped steel support mechanism is set up in at least two sets, and the foldable arc-shaped steel support mechanism includes multiple sections of arc-shaped steel support beams, which are overlapped together to form an arch structure compatible with the inner wall of the tunnel, and each section of the arc-shaped steel support beam is connected to the portal through a telescopic adjustment mechanism; monitoring components are provided on the arc-shaped steel support beam, and the monitoring components are pressure boxes, strain gauges or any device used for monitoring the stress of lining structures.

[0012] The aforementioned retractable arc maintenance support mechanism is set up in at least two sets; the retractable arc maintenance support mechanism includes a bottom arc steel beam adapted to the shape of the tunnel, and a second remote-controlled rail car slidably connected to the slide rail is provided at the bottom end of the bottom arc steel beam; multiple sections of top steel beam pads are arranged on the bottom arc steel beam, and the contour surface formed by the outer side surfaces of the multiple sections of top steel beam pads is an arched structure adapted to the inner wall of the tunnel, and each section of the top steel beam pad is connected to the bottom arc steel beam through a scissor-type lifting support.

[0013] The aforementioned curved rail vehicle maintenance mechanism includes a curved rail adapted to the shape of the tunnel, and a first remote-controlled rail vehicle slidably connected to the slide rail is provided at the bottom end of the curved rail; a lifting platform overhead crane that can move along the curved rail is provided on the curved rail, and the lifting platform overhead crane can carry a lining structure detection device, a lining structure removal device, a concrete pouring device or any type of tunnel lining maintenance device.

[0014] A method for repairing tunnel structure defects, comprising the following steps:

[0015] s1. Preliminarily determine the scope of tunnel lining structure defects through visual observation or other means, and control the travel power system through a remote controller to drive the maintenance trolley in the closed and retracted state to move to the corresponding position by itself;

[0016] s2. Carry out secondary inspection of the tunnel lining structure by using the corresponding lining structure inspection device installed on the curved rail vehicle inspection mechanism to further determine the parameters such as the lining structure defect section and defect depth, and then determine the scope of the lining structure that needs to be replaced;

[0017] s3. The folding arc-shaped steel support mechanism switches from the folded and contracted state to the extended support state, and is fixedly supported at the periphery of the front and rear ends of the lining structure defect;

[0018] s4. Divide the defective section of the lining structure within the length of the maintenance trolley into multiple demolition sections, and use the partitioned and skipped demolition method to demolish the defective section of the lining structure section by section until the lining structure within the fixed support range of the entire maintenance trolley is completely demolished. Then, use micro-expansion concrete with a strength one level higher than the original design concrete to cast concrete in the entire demolition area;

[0019] s5. Paint the surface of the lining structure after replacement to make the newly poured concrete consistent with the surface of the old concrete.

[0020] The steps of dismantling and replacing the lining structure defects in the aforementioned step s4 include:

[0021] s4.1. Divide the lining structure defects into multiple demolition sections, each of which is 1 to 1.5 m long. Use a retractable arc-shaped maintenance support mechanism to alternately support each demolition section, and use the arc-shaped rail vehicle maintenance mechanism to carry the corresponding lining structure removal device to perform skipping removal of the demolition sections until all the lining structures within the fixed support range of the maintenance trolley are completely removed.

[0022] For reinforced concrete structures, high-pressure water jetting is used to flush the concrete until the inner layer of steel bars are exposed.

[0023] For plain concrete structures, high-pressure water jetting, static crushing or cutting removal are used to remove the lining structure;

[0024] s4.2. Remove loose concrete fragments and roughen the concrete surface; and reinforce and repair the exposed secondary lining steel bars;

[0025] s4.3. Use the retractable arc-shaped maintenance support mechanism in a semi-supported state to hold the assembled formwork in place in the closed structure removal area on the outer surface of the secondary lining, and use the concrete pumping equipment on the lifting platform crane to pump concrete to the structure removal area;

[0026] s4.5. When the concrete strength reaches a certain level, the formwork is removed.

[0027] When the concrete strength reaches above 15MPa, the retractable arc-shaped maintenance support mechanism is adjusted from the semi-support state to the retracted state, and the formwork is removed piece by piece;

[0028] s4.6. After formwork removal, watering maintenance shall be carried out in time for no less than 14 days. The maintenance trolley can be moved to the next defective section of the lining structure to replace the lining structure only when the concrete strength reaches 24MPa or above.

[0029] Compared with the prior art, the present invention discloses a tunnel lining maintenance trolley and a structural defect repair method, which include a trolley frame, cross beams symmetrically arranged on both sides of the bottom of the trolley frame, a walking power system arranged on the bottom of the cross beams, and slide rails arranged on the top; and a plurality of folding arc steel support mechanisms, retractable arc maintenance support mechanisms and arc rail vehicle maintenance mechanisms adapted to the shape of the tunnel are arranged on the trolley frame, and the retractable arc maintenance support mechanisms and the arc rail vehicle maintenance mechanisms are slidably connected to the slide rails. During operation, the scope of the tunnel lining structure defect is first determined preliminarily through visual observation or other means, and the tunnel lining structure is secondary inspected by the arc-shaped rail vehicle maintenance mechanism equipped with the corresponding lining structure detection device to determine the scope of the lining structure that needs to be replaced, and the folding arc-shaped steel support mechanism is fixedly supported at the periphery of the front and rear ends of the lining structure defect to facilitate the replacement operation within the scope of the lining structure; during replacement, the lining structure defect section within the length of the maintenance trolley is divided into multiple demolition sections, and two arc-shaped rail vehicle maintenance mechanisms are used to alternately support each demolition section, and the arc-shaped rail vehicle maintenance mechanism is equipped with the corresponding lining structure removal device to perform a section-by-section demolition of the lining structure defect range, until the lining structure within the fixed support range of the entire maintenance trolley is completely removed; then, micro-expansion concrete with a grade one level higher than the original design concrete strength is used to carry out concrete pouring construction in the entire demolition area, so that the lining structure defect repair in the area supported by the folding arc-shaped steel support mechanism can be quickly completed. The effective coordination of various components during the repair process can deal with most tunnel structure disease problems. The curved rail car maintenance mechanism can flexibly carry lining structure detection equipment, lining structure removal equipment, concrete pumping equipment, etc., which can realize all-round detection of secondary lining diseases, mechanized removal of lining structure and remote control concrete pouring, thereby greatly improving the construction operability and construction efficiency of structural maintenance work. The folding curved steel support mechanism and the curved rail car maintenance mechanism can realize multiple temporary support reinforcement, mobile rapid support and other functions through telescopic shape changes, which can effectively reduce the construction risk of lining structure removal and replacement.

[0030] The beneficial effects of the present invention are:

[0031] (1) The present invention has a simple structure, flexible and convenient operation, and strong operability. Through the mutual cooperation of various components, and the flexible switching of the working modes of multiple components, the structural defects at any position of the tunnel lining can be repaired, and the application range is wide and the practicality is strong;

[0032] (2) The present invention has perfect functions. The foldable arc steel support mechanism, the retractable arc maintenance support mechanism and the arc rail vehicle maintenance mechanism cooperate with each other to realize practical functions such as multiple temporary support reinforcement, rapid detection of tunnel lining defects, mobile rapid support, lining structure removal, structural formwork casting, etc., which can greatly improve the work efficiency of tunnel lining defect repair, shorten the construction period, reduce financial and time investment, and have high construction efficiency and good safety and reliability.

[0033] (3) The present invention adopts the method of zoning skipping and integrally casting concrete to replace the sections within the scope of the lining structure disease. Combined with multiple temporary support reinforcement measures and targeted structural replacement schemes, it can effectively reduce the construction disturbance to the adjacent lining sections when the lining structure is removed, and the secondary lining after repair is not prone to shrinkage cracks. Compared with the conventional surface reinforcement method, it has a stronger ability to cure structural diseases;

[0034] (4) During the repair process, the present invention does not damage the original steel structure and drainage system. The structural restoration process after demolition is relatively easy. Compared with the existing lining removal scheme, the present invention is less destructive to the original structure and has a better repair effect on the tunnel structure.

[0035] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings, in which:

[0037] Figure 1 It is a structural schematic diagram of the present invention.

[0038] Figure 2 It is a structural schematic diagram of the trolley frame 1.

[0039] Figure 3 It is a structural schematic diagram of the telescopic expansion base 8.

[0040] Figure 4 It is a structural schematic diagram of the walking power system 3.

[0041] Figure 5 It is a schematic diagram of the connection structure between the foldable arc-shaped steel support mechanism 5 and the trolley frame 1.

[0042] Figure 6 for Figure 5 Schematic diagram of the connection structure between the front door frame 1011 or the rear door frame 1013 and the foldable arc-shaped steel support mechanism 5.

[0043] Figure 7 It is a schematic diagram of the connection structure of the retractable arc-shaped maintenance support mechanism 6, the arc-shaped rail vehicle maintenance mechanism 7 and the trolley frame 1.

[0044] Figure 8 It is a structural schematic diagram of the retractable arc-shaped maintenance support mechanism 6.

[0045] Fig. 9 for Figure 8 Schematic diagram of the connection structure between the middle top steel beam pad 603 and the bottom arc-shaped steel beam 601.

[0046] Fig.10 It is a structural schematic diagram of the arc-shaped rail vehicle maintenance mechanism 7.

[0047] Fig.11 for Fig.10 Schematic diagram of the structure of the medium lift platform crane 703.

[0048] Fig.12 It is a schematic diagram of the folding and contracting state of the foldable arc-shaped steel support mechanism 5 during operation.

[0049] Fig.13 It is a schematic diagram of the extended support state of the foldable arc-shaped steel support mechanism 5 during operation.

[0050] Fig.14 It is a schematic diagram of the closed and retracted state of the retractable arc-shaped maintenance support mechanism 6 during operation.

[0051] Fig.15 It is a schematic diagram of the fully extended support state of the retractable arc-shaped maintenance support mechanism 6 during operation.

[0052] Fig.16 It is a schematic diagram of the semi-support state of the retractable arc maintenance support mechanism 6 during operation.

[0053] Fig.17 The process of dismantling the lining structure in multiple replacement sections Figure 1 .

[0054] Fig.18 The process of dismantling the lining structure in multiple replacement sections Figure 2 .

[0055] Fig.19The process of dismantling the lining structure in multiple replacement sections Figure 3 .

[0056] Fig. 20 Schematic diagram of sealing and pouring the lining structure demolition area. DETAILED DESCRIPTION

[0057] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, rather than for limiting the protection scope of the present invention.

[0058] like Figure 1-Figure 11 As shown, a tunnel lining maintenance trolley comprises a trolley frame 1, cross beams 2 are symmetrically arranged on both sides of the bottom of the trolley frame 1, a walking power system 3 is arranged on the bottom of the cross beam 2, and a slide rail 4 is arranged on it; and a plurality of folding arc steel support mechanisms 5 adapted to the shape of the tunnel, a telescopic arc maintenance support mechanism 6 and an arc rail vehicle maintenance mechanism 7 are arranged on the trolley frame 1, and the telescopic arc maintenance support mechanism 6 and the arc rail vehicle maintenance mechanism 7 are slidably connected to the slide rail 4.

[0059] The travel power system 3, the foldable arc-shaped steel support mechanism 5, the telescopic arc-shaped maintenance support mechanism 6 and the arc-shaped rail vehicle maintenance mechanism 7 are all connected to the remote controller by telecommunication.

[0060] It also includes a telescopic expansion foundation 8, which is a plurality of sets and symmetrically arranged at the bottom of the trolley frame 1, the bottom of both sides of the foldable arc-shaped steel support mechanism (5), and the middle and both ends of the bottom surface of the crossbeam 2, serving as a support foundation when the maintenance trolley is working.

[0061] The telescopic expansion base 8 includes an expansion support plate 801, which is fixedly connected to the trolley frame 1 and the bottom surface of the beam 2 through a hydraulic cylinder 802. The hydraulic control system of the hydraulic cylinder 802 can be controlled by a remote controller to realize the telescopic action of the hydraulic cylinder 802, thereby realizing the expansion support plate 801 supporting the ground or retracting.

[0062] The trolley frame 1 includes a plurality of portal frames 101 similar in shape to a tunnel, and the portal frames 101 are connected to each other through a plurality of evenly distributed cross bars 102. The portal frames 101 are assembled into a structure similar in shape to a tunnel by a plurality of connecting rods through rigid or welding connection.

[0063] Preferably, the door frame 101 includes a front door frame 1011 and a rear door frame 1013 which are relatively arranged at the front and rear ends, a middle door frame 1012 is provided between the front door frame 1011 and the rear door frame 1013, and the front door frame 1011, the middle door frame 1012 and the rear door frame 1013 are connected to each other through a cross bar 102.

[0064] A plurality of working platforms 103 of different heights are symmetrically arranged on both sides of the trolley frame 1 .

[0065] The walking power system 3 is composed of two or more groups evenly distributed on the bottom surface of the cross beam 2, which is used to support and move the maintenance trolley. Specifically, the walking power system 3 is composed of three groups symmetrically arranged at the middle and both ends of the bottom surface of the cross beam 2 on the left and right sides of the trolley frame 1.

[0066] The walking power system 3 includes a power compartment 301 that can be remotely controlled. The power compartment 301 is connected to a roller mechanism 303 via a connecting transmission rod 302. The power compartment 301 can be controlled by a remote controller to realize the walking action of the walking power system 3.

[0067] The foldable arc-shaped steel support mechanism 5 is provided in at least two sets, which are respectively connected to the front door frame 1011 and the rear door frame 1013 through the telescopic adjustment mechanism 502.

[0068] The telescopic adjustment mechanism 502 may be an electric jack that can be remotely controlled.

[0069] The foldable arc-shaped steel support mechanism 5 includes multiple arc-shaped steel support beams 501, which are overlapped together to form an arched structure adapted to the inner wall of the tunnel. Each arc-shaped steel support beam 501 is connected to the front door frame 1011 or the rear door frame 1013 via a telescopic adjustment mechanism 502.

[0070] A monitoring component 503 is provided on the arc-shaped steel support beam 501 . The monitoring component 503 is a pressure box, a strain gauge or any device used for monitoring the stress of a lining structure.

[0071] The arc-shaped steel support beam 501 is arranged in three sections, including a top arc-shaped steel support beam 5011, and side arc-shaped steel support beams 5012 are symmetrically arranged on both sides of the top arc-shaped steel support beam 5011, and matching overlapping groove structures 5013 are arranged at both ends of the top arc-shaped steel support beam 5011 and the upper ends of the side arc-shaped steel support beams 5012, so that the top arc-shaped steel support beam 5011 and the side arc-shaped steel support beams 5012 on both sides are combined into a closed arc-shaped steel support beam through the overlapping groove structures 5013, which can be used as a ring-shaped support structure for the tunnel lining; the top arc-shaped steel support beam 5011 is arranged on the top of the front door frame 1011 or the rear door frame 1013, and is connected to the front door frame 1011 or the rear door frame 1013 through four vertical jacks. The side arc-shaped steel support beam 5012 is mechanically connected to the front door frame 1011 or the rear door frame 1013 through two horizontal jacks, and the expansion support state and the closing and contraction state of the arc-shaped steel support beam 501 are switched through the telescopic adjustment mechanism 502. When the arc-shaped steel support beam 501 is in the expansion support state, it serves as a temporary circumferential reinforcement support for the front and rear ends of the tunnel lining structure replacement section. At the same time, the monitoring components 503 can select pressure boxes, strain gauges, etc. according to specific needs to monitor the stress of the lining structure in real time; when the arc-shaped steel support beam 501 is in the closing and contraction state, the maintenance trolley can move longitudinally in the tunnel. When the arc-shaped steel support beam 501 is in the expansion support state, the telescopic expansion foundation at the bottom is in the extended support state to achieve auxiliary support; and when the arc-shaped steel support beam 501 is in the closing and contraction state, the telescopic expansion foundation at the bottom is in the contraction state, which is convenient for movement.

[0072] The slide rails 4 are at least two arranged on the crossbeam 2 along the longitudinal direction of the tunnel, and are symmetrically arranged on the top surface of the crossbeam 2 on the left and right sides of the trolley frame 1, and are arranged inside and outside; the telescopic arc maintenance support mechanism 6 is located on the outer slide rail, and the arc rail car maintenance mechanism 7 is located on the inner slide rail and realizes staggered sliding along the corresponding slide rail.

[0073] The retractable arc-shaped maintenance support mechanism 6 is provided in at least two sets.

[0074] The retractable arc maintenance support mechanism 6 includes a bottom arc steel beam 601 adapted to the shape of the tunnel, and a second remote-controlled rail vehicle 602 is provided at the bottom end of the bottom arc steel beam 601 for sliding connection with the slide rail 4; a plurality of sections of top steel beam pads 603 are arranged on the bottom arc steel beam 601, and gaps are left between the top steel beam pads 603 of adjacent sections for convenient telescopic movement; the contour surface formed by the outer side surfaces of the plurality of sections of top steel beam pads 603 is an arched structure adapted to the inner wall of the tunnel, and each section of the top steel beam pad 603 is connected to the bottom arc steel beam 601 through a scissor-type lifting support 604 that can be remotely controlled; the second remote-controlled rail vehicle 602 can be controlled by a remote controller to realize the sliding of the retractable arc maintenance support mechanism 6 along the slide rail 4, and at the same time, the mechanical deformation of the scissor-type lifting support 604 is controlled to realize radial scaling, thereby realizing the switching of the top steel beam pad 603 between the three working states of fully extended support state, semi-support state and closed and contracted state. When the top steel beam pad 603 is in a retracted state, the maintenance trolley can move longitudinally in the tunnel; when the top steel beam pad 603 is in a semi-supported state, it can cooperate with the assembled formwork 9 to realize the construction operation of supporting the formwork and pouring concrete; when the top steel beam pad 603 is in a fully expanded support state, it is closely attached to the tunnel lining structure and can be used as a temporary annular support.

[0075] The radius of the arc-shaped rail vehicle maintenance mechanism 7 is slightly smaller than the retractable arc-shaped maintenance support mechanism 6, so that the two are staggered in space to achieve mutual staggered movement.

[0076] The arc rail vehicle maintenance mechanism 7 includes an arc rail 701 adapted to the shape of the tunnel, and a first remote-controlled rail vehicle 702 is provided at the bottom of the arc rail 701 and is slidably connected to the slide rail 4; a lifting platform overhead crane 703 is provided on the arc rail 701 and can move along the arc rail 701. The lifting platform overhead crane 703 can carry a lining structure detection device, a lining structure removal device, a concrete pouring device or any tunnel maintenance device. The first remote-controlled rail vehicle 702 can be controlled by a remote controller to move along the slide rail 4 to perform tunnel maintenance work.

[0077] The arc rails 701 are arranged in two tracks, and the lifting platform crane 703 is arranged on the two arc rails to ensure better movement stability and improve maintenance accuracy.

[0078] The lifting platform crane 703 comprises a wheel frame 7031, a lifting equipment carrying platform 7032 is arranged in the middle of the wheel frame 7031, and power rollers 7034 connected to a remotely controlled driving motor 7033 and driven rollers 7035 used in conjunction with the power rollers 7034 are symmetrically arranged on both sides; a toothed structure 7011 is arranged on the arc rail 701, and the driving rollers 7034 and the driven rollers 7035 are relatively located at the upper and lower parts of the arc rail 701, and are connected to the arc rail 701 through the toothed structure 7011. The toothed structure 7011 is matched and installed with the arc rail 701; the driving motor 7033 can be controlled by a remote controller to provide power to the power roller 7034, so that the lifting platform crane 703 can slide along the arc rail 701; the lifting equipment carrying platform 7032 is slidingly connected to the wheel frame 7031 through an electric jack mechanism 7036 that can be remotely controlled; the lifting and lowering movement of the lifting equipment carrying platform 7032 can be realized by the extension and retraction of the electric jack mechanism 7036.

[0079] like Figure 12-Figure 20 As shown, the tunnel structure defect repair method based on the above-mentioned maintenance trolley includes the following steps:

[0080] s1. Preliminarily determine the scope of tunnel lining structure defects through visual observation or other means, and control the travel power system 3 through a remote controller to drive the maintenance trolley in the closed and retracted state to move to the corresponding position by itself;

[0081] s2. Perform secondary inspection on the tunnel lining structure by using the corresponding lining structure inspection device carried by the arc-shaped rail vehicle inspection mechanism 7 to further determine the parameters such as the lining structure defect section and defect depth, and then determine the scope of the lining structure that needs to be replaced;

[0082] s3, the foldable arc-shaped steel support mechanism 5 is switched from the folded and contracted state to the extended support state, and fixedly supported at the periphery of the front and rear ends of the lining structure defect;

[0083] s4. Divide the defective section of the lining structure within the length of the maintenance trolley into multiple demolition sections, and use the partitioned and skipped demolition method to demolish the defective section of the lining structure section by section until the lining structure within the fixed support range of the entire maintenance trolley is completely demolished. Then, use micro-expansion concrete with a strength one level higher than the original design concrete to cast concrete in the entire demolition area;

[0084] s5. Paint the surface of the lining structure after replacement to make the newly poured concrete consistent with the surface of the old concrete.

[0085] During the entire lining structure removal and replacement process, the monitoring and measurement work of relevant sections shall be strengthened. If any abnormal changes are found in the monitoring data, the construction shall be stopped immediately, the cause shall be found out and corresponding treatment shall be carried out. The lining structure removal and replacement construction can be resumed only after the safety of the overall structure is ensured.

[0086] In step s2, the structure detection device is mounted on the lifting platform crane 703 of the arc rail vehicle maintenance mechanism 7, and is controlled to move along the slide rail 4 by the first remote-controlled rail vehicle 702, and the lifting platform crane 703 can slide in a circular direction along the arc rail 701. At the same time, the lifting platform crane 703 can realize the lifting of the structure detection device, so that the structure detection device can reach any position within the contour line range of the tunnel lining structure for all-round detection.

[0087] The structural detection device is a geological radar antenna, which performs secondary detection on the lining structure defects at corresponding positions to further determine the scope of the lining structure defects and then determine the scope of the lining structure that needs to be dismantled and replaced.

[0088] In step s3, the maintenance trolley is moved to the position of the lining section to be replaced, the telescopic expansion foundation 8 is extended to the ground, the foldable arc-shaped steel support mechanism 5 is switched to the extended support state, and the annular reinforcement support is pressed against the two end heads of the secondary lining to be replaced, thereby effectively preventing the adverse effects of the replacement construction on the adjacent structural sections. At this time, the entire maintenance trolley is fixed in place, which not only provides the necessary temporary annular reinforcement support function, but also provides the construction work platform required for the replacement construction of the lining structure, and the lower part of the maintenance trolley also has a construction passage for related vehicles to pass.

[0089] The stress condition of the tunnel lining structure can be monitored by the monitoring component 503 to provide necessary monitoring data for construction.

[0090] In step s4,

[0091] The two retractable arc-shaped maintenance support mechanisms 6 are slidably adjusted to the front and rear sides of the section to be removed, so that they are adjusted from a closed and contracted state to a fully expanded support state, serving as temporary annular reinforcement support for the section to be removed, and then the arc-shaped rail vehicle maintenance mechanism 7 is slidably adjusted to the section to be removed, and the structural removal equipment carried out to remove the section structure;

[0092] When the dismantling of a replacement section is completed and the structural deformation is stable, the retractable arc-shaped maintenance support mechanism 6 is adjusted from the full support state to the retracted state, and is longitudinally moved together with the arc-shaped rail vehicle maintenance mechanism 7 to the next section to be dismantled separated from it for structural dismantling construction; and so on, until the lining structure within the fixed support range of the entire maintenance trolley is completely dismantled.

[0093] Specifically, the steps for dismantling and replacing lining structure defects include:

[0094] s4.1. Divide the lining structure defective section within the length range of the maintenance trolley into multiple demolition sections, each of which is 1 to 1.5 m long. Use the retractable arc-shaped maintenance support mechanism 6 to alternately support each demolition section, and use the corresponding lining structure demolition device of the arc-shaped rail vehicle maintenance mechanism 7 to perform skipping demolition on the demolition sections until all the lining structures within the fixed support range of the maintenance trolley are demolished;

[0095] According to the type of tunnel lining structure, different dismantling equipment is selected to dismantle the lining structure of the section to be dismantled:

[0096] In the case where the tunnel lining is a reinforced concrete structure: the lifting platform crane 703 is equipped with a high-pressure water jetting device, and the defective lining structure is washed and removed by high-pressure water jetting, and the concrete is washed layer by layer until the inner layer of steel bars is exposed and then stopped; during the washing and removal process, the first remote-controlled rail vehicle 702 is controlled to move along the slide rail 4 to adjust the longitudinal washing position, and the lifting platform crane 703 can slide circumferentially along the arc rail 701 to adjust the circumferential washing position, and the lifting platform crane 703 can realize the lifting and lowering to adjust the radial spacing between the nozzle of the high-pressure water jetting device and the lining structure;

[0097] In the case of a plain concrete structure for the tunnel lining: the lining structure is dismantled by high-pressure water jetting, or by static crushing, cutting and demolition. When high-pressure water jetting is used, the lining structure is dismantled by a lifting platform crane 703 equipped with a high-pressure water jetting device; when static crushing is used, the lining structure is dismantled by a lifting platform crane 703 equipped with a static hydraulic crusher; when cutting is used, the lining structure is dismantled by a lifting platform crane 703 equipped with a concrete cutter;

[0098] s4.2. Remove loose concrete fragments and roughen the concrete surface; repair the exposed secondary lining steel bars, including rust removal, binding and fixing, welding and reinforcing steel bars or other steel reinforcement treatments;

[0099] If necessary, the connection reinforcement ribs can be implanted by implanting reinforcement ribs;

[0100] s4.3, in order to seal and cast the replaced sections,

[0101] The assembled formwork 9 is used to enclose the structural demolition area, and the concrete pumping equipment is carried out by the lifting platform crane 703 to carry out pumping concrete pouring construction in the structural demolition area;

[0102] The two curved rail vehicle inspection mechanisms 7 are adjusted from the fully extended support state to the semi-support state, and the assembled formwork 9 is pressed against the outer surface of the secondary lining to ensure that the assembled formwork does not shift or deform during the concrete pouring process;

[0103] The concrete should be micro-expansive concrete, and its concrete strength should be one level higher than the original concrete structure. During pumping, vibrating equipment should be used to ensure that the concrete is poured densely;

[0104] s4.5. When the concrete strength reaches a certain level, the formwork is removed.

[0105] Preferably, when the concrete strength reaches 15 MPa or more, the assembled formwork 9 is removed; at this time, the two curved rail vehicle maintenance mechanisms 7 are adjusted from a semi-support state to a closed and contracted state, and the formwork is removed piece by piece;

[0106] After the formwork is removed, watering maintenance should be carried out in time. The maintenance time should be no less than 14 days. The concrete strength should reach above 24MPa before the maintenance trolley can be moved to the next section of the lining structure defective section to carry out the lining structure replacement work.

[0107] In step s5, the concrete surface can be painted so that the newly poured concrete is consistent with the old concrete surface to achieve an overall beautiful effect. The paint is made of white cement, gray cement, and latex to a color close to the surrounding concrete.

[0108] The above description is only a preferred embodiment of the present invention and does not constitute any form of confidentiality restriction on the present invention. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A tunnel lining maintenance trolley, characterized in that: The invention comprises a trolley frame (1), cross beams (2) symmetrically arranged on both sides of the bottom of the trolley frame (1), a travel power system (3) arranged on the bottom of the cross beam (2), and a slide rail (4) arranged on the top; and a plurality of foldable arc-shaped steel support mechanisms (5) adapted to the shape of the tunnel, a retractable arc-shaped maintenance support mechanism (6) and an arc-shaped rail vehicle maintenance mechanism (7) are arranged on the trolley frame (1), and the retractable arc-shaped maintenance support mechanism (6) and the arc-shaped rail vehicle maintenance mechanism (7) are slidably connected to the slide rail (4); The slide rails (4) are at least two and are arranged on the crossbeam (2) along the longitudinal direction of the tunnel, and are symmetrically arranged on the top surface of the crossbeam (2) on the left and right sides of the trolley frame (1); The retractable arc-shaped maintenance support mechanism (6) and the arc-shaped rail vehicle maintenance mechanism (7) are respectively arranged on different slide rails, and the radius of the arc-shaped rail vehicle maintenance mechanism (7) is slightly smaller than that of the retractable arc-shaped maintenance support mechanism (6), so that the two are staggered in space and can move in an interlaced manner. The retractable arc-shaped maintenance support mechanism (6) is provided with at least two sets; the retractable arc-shaped maintenance support mechanism (6) comprises a bottom arc-shaped steel beam (601) adapted to the shape of the tunnel, and a second remote-controlled rail vehicle (602) slidably connected to the slide rail (4) is provided at the bottom end of the bottom arc-shaped steel beam (601); a plurality of sections of top steel beam pads (603) are arranged on the bottom arc-shaped steel beam (601), and the contour surface formed by the outer side surfaces of the plurality of sections of top steel beam pads (603) is an arched structure adapted to the inner wall of the tunnel, and each section of the top steel beam pad (603) is connected to the bottom arc-shaped steel beam (601) via a scissor-type lifting support (604); The arc-shaped rail vehicle maintenance mechanism (7) comprises an arc-shaped rail (701) adapted to the shape of the tunnel, and a first remote-controlled rail vehicle (702) slidably connected to a slide rail (4) is provided at the bottom end of the arc-shaped rail (701); a lifting platform overhead crane (703) is provided on the arc-shaped rail (701) and moves along the arc-shaped rail (701), and the lifting platform overhead crane (703) can carry a lining structure detection device, a lining structure removal device, a concrete pouring device or any other tunnel lining maintenance device.

2. The tunnel lining maintenance trolley according to claim 1, characterized in that: The travel power system (3), the foldable arc-shaped steel support mechanism (5), the telescopic arc-shaped maintenance support mechanism (6) and the arc-shaped rail vehicle maintenance mechanism (7) are all connected to the remote control by telecommunication.

3. The tunnel lining maintenance trolley according to claim 1 or 2, characterized in that: It also includes a telescopic expansion foundation (8), which is a plurality of sets and is symmetrically arranged at the bottom of both sides of the trolley frame (1), the foldable arc-shaped steel support mechanism (5), and the middle and both ends of the bottom surface of the crossbeam (2).

4. The tunnel lining maintenance trolley according to claim 3 is characterized in that: The trolley frame (1) comprises a plurality of door frames (101) having a shape similar to that of a tunnel, wherein the door frames (101) comprise a front door frame (1011) and a rear door frame (1013) which are arranged relatively at the front and rear ends, a middle door frame (1012) is provided between the front door frame (1011) and the rear door frame (1013), and the front door frame (1011), the middle door frame (1012) and the rear door frame (1013) are connected to each other via a crossbar (102).

5. The tunnel lining maintenance trolley according to claim 4, characterized in that: The foldable arc-shaped steel support mechanism (5) is provided in at least two sets, and the foldable arc-shaped steel support mechanism (5) comprises a plurality of arc-shaped steel support beams (501) which are overlapped together to form an arched structure adapted to the inner wall of the tunnel, and each arc-shaped steel support beam (501) is connected to the portal frame (101) via a telescopic adjustment mechanism (502); A monitoring component (503) is provided on the arc-shaped steel support beam (501), and the monitoring component (503) is a pressure box, a stress gauge or any other device used for monitoring the stress of a lining structure.

6. A method for repairing tunnel structure defects, characterized in that: The method is implemented by using the tunnel lining maintenance trolley described in any one of claims 1 to 5, comprising the following steps: s1. Preliminarily determine the scope of the tunnel lining structure defects through visual observation or other means, and control the travel power system (3) through a remote controller to drive the maintenance trolley in the closed and retracted state to move to the corresponding position by itself; s2. Perform secondary inspection on the tunnel lining structure by using the corresponding lining structure inspection device carried out on the curved rail vehicle inspection mechanism (7), further determine the lining structure defect section and defect depth parameters, and then determine the scope of the lining structure that needs to be replaced; s3, the foldable arc-shaped steel support mechanism (5) is switched from a folded and contracted state to an extended support state, and is fixedly supported at the periphery of the front and rear ends of the lining structure defect; s4. Divide the defective section of the lining structure within the length of the maintenance trolley into multiple demolition sections, and use the partitioned and skipped demolition method to demolish the defective section of the lining structure section by section until the lining structure within the fixed support range of the entire maintenance trolley is completely demolished. Then, use micro-expansion concrete with a strength one level higher than the original design concrete to cast concrete in the entire demolition area; s5. Paint the surface of the lining structure after replacement to make the newly poured concrete consistent with the surface of the old concrete.

7. The tunnel structure defect repair method according to claim 6, characterized in that: The steps of dismantling and replacing the lining structure defects in step s4 include: s4.

1. The lining structure defect is divided into a plurality of demolition sections, each of which is 1 to 1.5 m long. A retractable arc-shaped maintenance support mechanism (6) is used to alternately support each demolition section, and a corresponding lining structure removal device is carried out through the arc-shaped rail vehicle maintenance mechanism (7) to perform skipping removal of the demolition sections until all the lining structures within the fixed support range of the maintenance trolley are removed. For reinforced concrete structures, high-pressure water jetting is used to flush the concrete until the inner layer of steel bars are exposed. For plain concrete structures, high-pressure water jetting, static crushing or cutting removal are used to remove the lining structure; s4.

2. Remove loose concrete fragments and roughen the concrete surface; and reinforce and repair the exposed secondary lining steel bars; s4.3, using the retractable arc-shaped maintenance support mechanism (6) in a semi-supported state to hold the assembled formwork (9) in place in the closed structural demolition area on the outer surface of the secondary lining, and using the lifting platform crane (703) to carry concrete pumping equipment to perform pumping concrete pouring construction in the structural demolition area; s4.

5. When the concrete strength reaches a certain level, the formwork is removed. When the concrete strength reaches 15 MPa or above, the retractable arc-shaped maintenance support mechanism (6) is adjusted from a semi-support state to a retracted state, and the formwork is removed piece by piece; s4.

6. After demoulding, watering and curing shall be carried out in time. The curing time shall not be less than 14 days. The maintenance trolley can be moved to the next defective section of lining structure to replace the lining structure only when the concrete strength reaches 24MPa or above.

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