Formwork supporting trolley for underground excavation of secondary lining and construction method of formwork supporting trolley

Abstract

The invention relates to the technical field of underground excavation construction, and discloses a formwork supporting trolley for underground excavation of a second lining and a construction method thereof.The formwork supporting trolley comprises a trolley body, a telescopic beam structure, a plurality of hydraulic formwork supporting structures and a plurality of top supporting legs, the trolley body is movably arranged in a pilot tunnel of a primary support, and the telescopic beam structure is telescopically connected to the trolley body; the telescopic beam structure comprises at least three telescopic longitudinal beams and a reinforcing beam, the reinforcing beam is detachably connected among the at least three telescopic longitudinal beams, and the reinforcing beam is used for being matched with the middle partition wall in a penetrating mode; the multiple hydraulic formwork structures are detachably installed on the telescopic beam structure, the multiple hydraulic formwork structures are distributed around the cross section of the telescopic beam structure at intervals in the circumferential direction, and each hydraulic formwork structure is provided with an unfolding position and a folding position; the multiple top supporting legs are installed at the end, away from the trolley body, of the telescopic beam structure and distributed at intervals in the circumferential direction of the cross section of the telescopic beam structure, and the top supporting legs have the jacking state in jacking fit with the inner wall of the primary support and the contraction state separated from the inner wall of the primary support.

Description

Technical Field

[0001] The invention relates to the technical field of dark excavation construction, in particular to a formwork trolley for dark excavation secondary lining and a construction method thereof. Background Art

[0002] During tunnel construction, the secondary lining is an important part of the tunnel support structure. The secondary lining is usually made of reinforced concrete or plain concrete. The secondary lining is constructed after the primary support is completed. The quality of the secondary lining construction directly affects the safety and stability of the tunnel.

[0003] For example, the Chinese invention patent application with application publication number CN117345282A and application publication date 2024.01.05 discloses a split combined secondary lining trolley, which specifically includes a main trolley, multiple split trolleys, a bracket system, a horizontal middle partition wall, a vertical middle partition wall, a single-sided split walking track, an inner rail of the tunnel middle partition wall and a steel formwork at the support point. The main trolley includes multiple longitudinal beams, one end of the multiple longitudinal beams is commonly fixedly connected to a top form, and the other end of the multiple longitudinal beams is commonly fixedly connected to a cross beam. The bottom wall of the cross beam is symmetrically fixedly connected to two groups of first support assemblies, each group of first support assemblies includes two first legs, and each first leg side wall is provided with multiple first screw rods, and the other end of each first screw rod is provided with a first jack. The structural form of combining the main trolley and the lateral trolley is adopted to realize the continuous construction of the tunnel secondary lining structure on the basis of retaining the temporary support structure of the tunnel.

[0004] In summary, the existing split combined secondary lining trolley is divided into multiple split structures with the middle partition wall as the boundary. The middle partition wall of the tunnel is difficult to provide reliable support for the main trolley and the split trolley; moreover, it is difficult to construct the main trolley and the split trolley simultaneously, and it is impossible to meet the requirements of simultaneously constructing the secondary lining and dismantling the middle partition wall. When dismantling the middle partition wall, the initial support stability is poor and the waterproof node is weak. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing tunnel middle partition wall is difficult to provide reliable support for the main trolley and the split trolley, the main trolley and the split trolley are difficult to construct synchronously, and the requirements of simultaneously constructing the secondary lining and dismantling the middle partition wall cannot be met. When dismantling the middle partition wall, the initial support stability is poor and the waterproof node is weak.

[0006] In order to solve the above technical problems, the present invention provides a technical solution for a formwork trolley for a dark excavation secondary lining:

[0007] The formwork trolley for the blind excavation secondary lining comprises a trolley body, a telescopic beam structure, a plurality of hydraulic formwork structures and a plurality of top legs, wherein the trolley body is movably arranged in the primary support guide hole, and the telescopic beam structure is telescopically connected to the trolley body parallel to the length direction of the trolley body;

[0008] The telescopic beam structure includes at least three telescopic longitudinal beams and a reinforcing beam, wherein the at least three telescopic longitudinal beams are arranged in parallel with the length direction of the trolley body, and the reinforcing beam is detachably connected between the at least three telescopic longitudinal beams, and the reinforcing beam is used to penetrate and cooperate with the middle partition wall;

[0009] A plurality of the hydraulic formwork structures are detachably mounted on the telescopic beam structure, and the plurality of the hydraulic formwork structures are circumferentially spaced around the cross section of the telescopic beam structure, and the hydraulic formwork structures have an extended position and a retracted position;

[0010] The plurality of top legs are respectively installed at the ends of the telescopic beam structure away from the trolley body, and the plurality of top legs are circumferentially spaced around the cross section of the telescopic beam structure, and the top legs have a top pressing state in cooperation with the top support of the inner wall of the primary support, and a contracted state in which they are separated from the inner wall of the primary support;

[0011] When the secondary lining is poured, the top legs are in a top pressing state, the hydraulic formwork structure is in an extended position and forms a secondary lining formwork structure distributed around the outer side of the telescopic beam structure;

[0012] After the second lining is poured, the hydraulic formwork structure is in the retracted position, the top support legs are in the top pressing state, and the telescopic beam structure is retracted to allow the trolley body to move forward; the trolley body moves forward to its position, the top support legs remain in the retracted state, and the telescopic beam structure is pushed forward to enter the next section of primary support.

[0013] Furthermore, rollers are installed at the lower part of the trolley body, and a longitudinal track is provided at the lower side of the trolley body. The rollers are rotatably mounted on the longitudinal track, and a limit plate for cooperating with the longitudinal track is also installed on the trolley body.

[0014] Furthermore, the trolley main body includes at least three trolley longitudinal beams, and at least three trolley longitudinal beams are arranged at intervals parallel to the length direction of the trolley main body. A telescopic channel for sliding assembly of the telescopic longitudinal beam is provided inside the trolley longitudinal beam, and a longitudinal drive is also provided between the trolley longitudinal beam and the telescopic longitudinal beam.

[0015] Further, the trolley longitudinal beams are provided with five, which are respectively an upper trolley longitudinal beam, two middle trolley longitudinal beams and two lower trolley longitudinal beams, the upper trolley longitudinal beam is arranged on the middle upper side of the two middle trolley longitudinal beams, and the two lower trolley longitudinal beams are arranged correspondingly on the lower sides of the two middle trolley longitudinal beams;

[0016] Structural beams are fixedly connected between the upper trolley longitudinal beam and the middle trolley longitudinal beam, between the middle trolley longitudinal beam and the lower trolley longitudinal beam, between the two middle trolley longitudinal beams, and between the two lower trolley longitudinal beams.

[0017] Further, the telescopic longitudinal beams are provided with five, which are respectively an upper telescopic longitudinal beam, two middle telescopic longitudinal beams and two lower telescopic longitudinal beams, the upper telescopic longitudinal beam is arranged on the middle upper side of the two middle telescopic longitudinal beams, and the two lower telescopic longitudinal beams are correspondingly arranged on the lower sides of the two middle telescopic longitudinal beams;

[0018] The reinforcing beams are detachably connected between the upper telescopic longitudinal beam and the two middle telescopic longitudinal beams, between the middle telescopic longitudinal beam and the lower telescopic longitudinal beam, between the two middle telescopic longitudinal beams, and between the two lower telescopic longitudinal beams.

[0019] Furthermore, the hydraulic formwork structures are provided with five, namely, an upper hydraulic formwork structure, an upper corner hydraulic formwork structure, a middle side hydraulic formwork structure, a lower side hydraulic formwork structure, and a lower corner hydraulic formwork structure. The upper hydraulic formwork structure is installed on the upper telescopic longitudinal beam, the upper corner hydraulic formwork structure and the middle side hydraulic formwork structure are both installed on the middle side telescopic longitudinal beam, and the lower side hydraulic formwork structure and the lower corner hydraulic formwork structure are both installed on the lower side telescopic longitudinal beam.

[0020] Furthermore, the hydraulic formwork structure includes a hydraulic jack, a jacking support, a segmented formwork and an extension drive, one end of the hydraulic jack is detachably connected to the telescopic beam structure, the jacking support is installed on the other end of the hydraulic jack, the segmented formwork is hingedly connected to the outside of the jacking support, and the extension drive is connected between the hydraulic jack and the segmented formwork.

[0021] Furthermore, the top pressure support is hingedly installed on the other end of the hydraulic jack, and the hinge axis of the top pressure support is arranged parallel to the length direction of the trolley body; the top pressure support is located on both sides of the hinge axis and two of the segmented templates are respectively arranged. When in the expanded position, the two segmented templates and the top pressure support are connected to form a second lining template segment matching the primary support profile.

[0022] Furthermore, a force transmission corbel is detachably mounted on a side of the jacking support away from the hydraulic jacking column, and the force transmission corbel is used to cooperate with the inner wall support of the primary support.

[0023] In order to solve the above technical problems, the present invention provides a technical solution for the construction method of a formwork trolley for a dark excavation secondary lining:

[0024] The construction method of the formwork trolley for the dark excavation secondary lining includes the following steps:

[0025] S1. Install the trolley body in the guide hole of the primary support, stop and limit the trolley body, and lay a waterproof layer on the inner wall of the primary support of the secondary lining structure to be constructed;

[0026] S2, start the longitudinal drive to push the telescopic beam structure forward to the second lining structure to be constructed, control the top support leg to move to the top pressure state, the top support leg cooperates with the inner wall top support of the primary support of the second lining structure to be constructed, and install the hydraulic formwork structure;

[0027] S3, opening the hydraulic formwork structure, and the force transmission bracket of the hydraulic formwork structure cooperates with the inner wall top support of the primary support of the secondary lining structure to be constructed;

[0028] S4. Remove the middle partition wall of the secondary lining structure to be constructed and apply a complete closed waterproof layer;

[0029] S5. Tie steel bars in the secondary lining area, unfold the segmented formwork, form a secondary lining formwork structure on the inner side of the secondary lining structure, and pour the secondary lining concrete;

[0030] S6. After the secondary lining concrete solidifies and reaches the designed strength, the hydraulic formwork structure and the segmented formwork are retracted, the stop limit of the trolley body is released, the top legs are kept fixed, the telescopic beam structure is controlled to retract, and the trolley body moves forward;

[0031] S7, after the trolley body moves to the set position, the top support leg is adjusted to the retracted state, the trolley body is stopped and limited, the longitudinal drive is started to push the telescopic beam structure forward to the next section of the primary support, and steps S2 to S7 are repeated.

[0032] Compared with the prior art, the formwork trolley and construction method for the second lining of the dark excavation of the present invention have the following beneficial effects: the formwork trolley for the second lining of the dark excavation adopts a design form of a trolley main body, a telescopic beam structure, a plurality of top legs and a plurality of hydraulic formwork structures, the trolley main body can be movably arranged in the guide hole of the primary support, and the telescopic beam structure is telescopically connected to the trolley main body parallel to the length direction of the trolley main body. The trolley main body can move along the guide hole of the primary support, at least three telescopic longitudinal beams of the telescopic beam structure can telescope relative to the trolley main body, the telescopic longitudinal beams extend forward and can enter the primary support of the second lining structure to be constructed, and the telescopic longitudinal beams and the middle partition wall are staggered to avoid interference, at least three telescopic longitudinal beams are combined with the reinforcing beams that penetrate the middle partition wall, and the reinforcing beams are removed after the construction of the second lining of this section, so as not to affect the telescopic longitudinal beams from entering the next section of the primary support, thereby forming a movable installation foundation for multiple hydraulic formwork structures.

[0033] Among them, multiple hydraulic formwork structures can be detachably installed on the telescopic beam structure, and multiple hydraulic formwork structures are circumferentially spaced around the cross-section of the telescopic beam structure. When the telescopic beam structure enters the primary support of the secondary lining structure to be constructed, the telescopic beam structure is circumferentially installed with multiple hydraulic formwork structures, and the multiple hydraulic formwork structures can provide complete circumferential support to the inner wall of the primary support. The hydraulic formwork structure can be unfolded to form a secondary lining formwork structure distributed around the outside of the telescopic beam structure, so as to facilitate the pouring of concrete into the cavity between the primary support and the secondary lining formwork structure. After the construction of this section of the secondary lining structure is completed, the hydraulic formwork structure can be retracted to separate the hydraulic formwork structure from the secondary lining structure to complete the work.

[0034] In addition, multiple top support legs are respectively installed on the ends of the telescopic beam structure away from the trolley body, and the multiple top support legs are circumferentially spaced around the cross-section of the telescopic beam structure. The top support legs can be used as temporary fulcrums of the hydraulic formwork structure. When the top support legs are in a top pressure state, they cooperate with the inner wall support of the initial support, which can not only support the initial support but also serve as an anchor point for the advancement of the trolley body; when the top support legs are in a contracted state, they are separated from the inner wall of the initial support and can move forward relative to the trolley body.

[0035] The working process of the present invention is as follows: when the second lining is poured, the top legs are in a top-pressing state, the hydraulic formwork structure is in an extended position and forms a second lining formwork structure distributed around the outer side of the telescopic beam structure; after the second lining is poured, the hydraulic formwork structure is in a retracted position, the top legs are in a top-pressing state, and the telescopic beam structure retracts to allow the trolley body to move forward; when the trolley body moves forward to its position, the top legs remain in a retracted state, and the telescopic beam structure pushes forward to enter the next section of initial support. The telescopic beam structure works in a segmented forward manner, and does not require the aid of a middle partition wall to ensure the support reliability of the formwork trolley, reducing the difficulty of constructing the formwork trolley, and can also provide reliable support for the inner wall of the initial support of the second lining structure to be constructed, avoiding the interference between the telescopic longitudinal beam and the middle partition wall, and can meet the requirements of simultaneously constructing the second lining structure and removing the middle partition wall, ensuring the stability of the initial support and waterproof nodes when removing the middle partition wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the main view of a formwork trolley for a dark excavation secondary lining (before the construction of the secondary lining structure) in an embodiment of the present invention;

[0037] Figure 2 It is a schematic front view of a formwork trolley for a blind excavation secondary lining (when the hydraulic formwork structure is in the unfolded position) in an embodiment of the present invention;

[0038] Figure 3 It is a front view schematic diagram of a formwork trolley (when the trolley body moves forward) for dark excavation secondary lining in an embodiment of the present invention;

[0039] Figure 4It is a schematic front view of a formwork trolley for a dark excavation secondary lining (when a telescopic beam structure is jacked in) in an embodiment of the present invention;

[0040] Figure 5 is a schematic cross-sectional view of a trolley body in an embodiment of the present invention;

[0041] Figure 6 is a schematic cross-sectional view of a telescopic beam structure (when the segmented template is omitted) in an embodiment of the present invention;

[0042] Figure 7 is a schematic cross-sectional view of the telescopic beam structure (when the middle partition wall is removed) in an embodiment of the present invention;

[0043] Figure 8 1 is a schematic structural diagram of an upper hydraulic formwork structure (from an extended position to a retracted position) according to an embodiment of the present invention;

[0044] Fig. 9 It is a structural schematic diagram of the upper corner hydraulic formwork structure and the middle side hydraulic formwork structure (from the extended position to the retracted position) of an embodiment of the present invention;

[0045] Fig.10 1 is a schematic structural diagram of a lower hydraulic formwork structure and a lower corner hydraulic formwork structure (from an extended position to a retracted position) according to an embodiment of the present invention;

[0046] Fig.11 2 is a schematic structural diagram of a force transmission bracket according to an embodiment of the present invention;

[0047] In the figure: 1-trolley body, 10-trolley longitudinal beam, 11-upper trolley longitudinal beam, 12-middle trolley longitudinal beam, 13-lower trolley longitudinal beam, 14-roller, 15-longitudinal track, 16-limiting plate, 17-longitudinal drive, 18-structural beam, 2-telescopic beam structure, 20-telescopic longitudinal beam, 21-upper telescopic longitudinal beam, 22-middle telescopic longitudinal beam, 23-lower telescopic longitudinal beam, 24-reinforcement beam, 240-T-shaped reinforcement beam, 3-hydraulic formwork structure, 30-force transmission bracket, 300-spoiler, 301-hydraulic Top pressure column, 302-top pressure support, 303-segmented formwork, 304-extension drive, 305-bottom formwork, 306-bottom drive, 307-end plate, 308-web plate, 309-rib plate, 31-upper hydraulic formwork structure, 32-upper corner hydraulic formwork structure, 33-middle side hydraulic formwork structure, 34-lower side hydraulic formwork structure, 35-lower corner hydraulic formwork structure, 4-top support leg, 5-primary support, 50-middle partition wall, 6-second lining structure, a-trolley section, b-first construction section, c-second construction section. DETAILED DESCRIPTION

[0048] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] like Figures 1 to 11 As shown, a formwork trolley for blind excavation secondary lining according to an embodiment of the present invention comprises a trolley body 1, a telescopic beam structure 2, a plurality of hydraulic formwork structures 3 and a plurality of top legs 4, the trolley body 1 is movably arranged in a guide hole of a primary support 5, the telescopic beam structure 2 is telescopically connected to the trolley body 1 in parallel with the length direction of the trolley body 1; the telescopic beam structure 2 comprises at least three telescopic longitudinal beams 20 and a reinforcing beam 24, at least three telescopic longitudinal beams 20 are arranged at intervals in parallel with the length direction of the trolley body 1, the reinforcing beam 24 is detachably connected between the at least three telescopic longitudinal beams 20, and the reinforcing beam 24 is used to penetrate and cooperate with the middle partition wall 50, and the reinforcing beam 24 is removed after the construction of the secondary lining of this section to avoid affecting the entry of the telescopic longitudinal beam 20 into the next section of the primary support 2.

[0053] Multiple hydraulic formwork structures 3 can be detachably installed on the telescopic beam structure 2, and the multiple hydraulic formwork structures 3 are circumferentially spaced around the cross-section of the telescopic beam structure 2, and the hydraulic formwork structures 3 have an expanded position and a retracted position; multiple top support legs 4 are respectively installed on the ends of the telescopic beam structure 2 away from the trolley body 1, and the multiple top support legs 4 are circumferentially spaced around the cross-section of the telescopic beam structure 2, and the top support legs 4 have a top pressing state that cooperates with the inner wall of the primary support 5, and a contracted state that is separated from the inner wall of the primary support 5.

[0054] When the secondary lining is poured, the top support leg 4 is in a top-pressing state, the hydraulic formwork structure 3 is in an expanded position and forms a secondary lining formwork structure distributed around the outer side of the telescopic beam structure 2; after the secondary lining is poured, the hydraulic formwork structure 3 is in a retracted position, the top support leg 4 is in a top-pressing state, and the telescopic beam structure 2 retracts to allow the trolley body 1 to move forward; when the trolley body 1 moves forward into place, the top support leg 4 remains in a retracted state, and the telescopic beam structure 2 is pushed forward to enter the next section of primary support 5.

[0055] The formwork trolley for the dark excavation secondary lining adopts the design form of a trolley body 1, a telescopic beam structure 2, a plurality of top legs 4 and a plurality of hydraulic formwork structures 3. The trolley body 1 can be movably arranged in the guide hole of the primary support 5, and the telescopic beam structure 2 is telescopically connected to the trolley body 1 in parallel with the length direction of the trolley body 1. The trolley body 1 can move along the guide hole of the primary support 5, and at least three telescopic longitudinal beams 20 of the telescopic beam structure 2 can telescope relative to the trolley body 1. The telescopic longitudinal beams 20 extend forward and can enter the primary support 5 of the secondary lining structure 6 to be constructed, and the telescopic longitudinal beams 20 and the middle partition wall 50 are staggered to avoid interference. At least three telescopic longitudinal beams 20 are combined with the reinforcing beams 24 that penetrate the middle partition wall 50. The reinforcing beams 24 are removed after the construction of the secondary lining of this section to avoid affecting the telescopic longitudinal beams 20 from entering the next section of the primary support 2, thereby forming a movable installation foundation for multiple hydraulic formwork structures 3. In order to ensure the stability of the primary support 5 when the middle partition 50 is removed, the reinforcing beam 24 passes through the opening of the middle partition 50. The end face of the opening is determined according to the longitudinal length of the primary formwork of the secondary lining structure 6, preferably 2m per one.

[0056] Among them, multiple hydraulic formwork structures 3 can be detachably installed on the telescopic beam structure 2, and multiple hydraulic formwork structures 3 are circumferentially spaced around the cross section of the telescopic beam structure 2. When the telescopic beam structure 2 enters the primary support 5 of the secondary lining structure 6 to be constructed, the telescopic beam structure 2 is circumferentially installed with multiple hydraulic formwork structures 3, and the multiple hydraulic formwork structures 3 can provide complete circumferential support for the inner wall of the primary support 5. The hydraulic formwork structure 3 can be unfolded to form a secondary lining formwork structure distributed around the outside of the telescopic beam structure 2, so as to facilitate the pouring of concrete into the cavity between the primary support 5 and the secondary lining formwork structure. After the construction of this section of the secondary lining structure 6 is completed, the hydraulic formwork structure 3 can be folded up, and the hydraulic formwork structure 3 can be separated from the secondary lining structure 6 to complete the work.

[0057] In addition, multiple top support legs 4 are respectively installed on the ends of the telescopic beam structure 2 away from the trolley body 1, and the multiple top support legs 4 are circumferentially spaced around the cross-section of the telescopic beam structure 2. The top support legs 4 can be used as temporary fulcrums for the hydraulic formwork structure 3. When the top support legs 4 are in a top pressure state, they cooperate with the inner wall of the primary support 5 to support the primary support 5 and serve as anchor points for the advancement of the trolley body 1; when the top support legs 4 are in a contracted state, they are separated from the inner wall of the primary support 5 and can move forward relative to the trolley body 1.

[0058] The working process of the present invention is as follows: when the second lining is poured, the top leg 4 is in a top-pressing state, the hydraulic formwork structure 3 is in an extended position and forms a second lining formwork structure distributed around the outer side of the telescopic beam structure 2; after the second lining is poured, the hydraulic formwork structure 3 is in a retracted position, the top leg 4 is in a top-pressing state, and the telescopic beam structure 2 is retracted to allow the trolley body 1 to advance; the trolley body 1 advances to its position, the top leg 4 remains in a retracted state, and the telescopic beam structure 2 is pushed forward to enter the next section of the primary support 5. The telescopic beam structure 2 is a segmented forward operation, which ensures the support reliability of the formwork trolley without the aid of the middle partition wall 50, reduces the difficulty of the construction of the formwork trolley, and can also provide reliable support for the inner wall of the primary support 5 of the second lining structure 6 to be constructed, avoids the interference of the telescopic longitudinal beam 20 and the middle partition wall 50, and can meet the requirements of simultaneously constructing the second lining structure 6 and removing the middle partition wall 50, ensuring the stability of the primary support 5 and the waterproof node when the middle partition wall 50 is removed.

[0059] In this embodiment, a roller 14 is installed at the lower part of the trolley body 1, a longitudinal track 15 is arranged at the lower side of the trolley body 1, the roller 14 is rollingly assembled on the longitudinal track 15, and a limit plate 16 for stopping and cooperating with the longitudinal track 15 is also installed on the trolley body 1. The trolley body 1 adopts the design of the longitudinal track 15 and the roller 14, which improves the movement accuracy of the trolley body 1, and the trolley body 1 can be stopped and limited in combination with the limit plate 16, ensuring that the position of the formwork during the secondary lining construction process is stable and unchanged.

[0060] As a further preferred solution, the trolley body 1 includes at least three trolley longitudinal beams 10, and at least three trolley longitudinal beams 10 are arranged at intervals parallel to the length direction of the trolley body 1. A telescopic channel for sliding and assembling the telescopic longitudinal beam 20 is provided inside the trolley longitudinal beam 10, and a longitudinal drive 17 is also provided between the trolley longitudinal beam 10 and the telescopic longitudinal beam 20. The longitudinal drive 7 can be a hydraulic cylinder, which can effectively drive the telescopic longitudinal beam 20 to slide back and forth relative to the trolley longitudinal beam 10, thereby ensuring the reliability of the trolley body 1 moving forward and the telescopic beam structure 2 pushing forward. In this embodiment, the trolley longitudinal beams 10 for the double-side wall guide hole are designed to be five. In other embodiments, for dark excavation methods such as CRD and CD, the number of trolley longitudinal beams can be adaptively adjusted and flexibly installed. Specifically, the power of the formwork trolley can be advanced by the longitudinal drive 17 of the telescopic beam structure 2, or it can be propelled by external power through the oil cylinder pressure relief.

[0061] As a further preferred solution, the trolley longitudinal beam 10 is provided with five Figure 5 As shown, there are an upper trolley longitudinal beam 11, two middle trolley longitudinal beams 12 and two lower trolley longitudinal beams 13. The upper trolley longitudinal beam 11 is arranged on the middle upper side of the two middle trolley longitudinal beams 12, and the two lower trolley longitudinal beams 13 are arranged on the lower side of the two middle trolley longitudinal beams 12; structural beams 18 are fixedly connected between the upper trolley longitudinal beam 11 and the middle trolley longitudinal beam 12, between the middle trolley longitudinal beam 12 and the lower trolley longitudinal beam 13, between the two middle trolley longitudinal beams 12, and between the two lower trolley longitudinal beams 13. The cross-sectional profile of the trolley body 1 is closer to the inner profile of the guide hole of the primary support 5, and the structural integrity is good, ensuring that the telescopic beam structure 2 can play a comprehensive internal support role for the primary support 5.

[0062] Specifically, there are five telescopic longitudinal beams 20, which are an upper telescopic longitudinal beam 21, two middle telescopic longitudinal beams 22 and two lower telescopic longitudinal beams 23. The upper telescopic longitudinal beam 21 is arranged on the middle upper side of the two middle telescopic longitudinal beams 22, and the two lower telescopic longitudinal beams 23 are arranged on the lower side of the two middle telescopic longitudinal beams 22. The upper telescopic longitudinal beam 21 and the two middle telescopic longitudinal beams 22, the middle telescopic longitudinal beam 22 and the lower telescopic longitudinal beams 23, the two middle telescopic longitudinal beams 22, and the two lower telescopic longitudinal beams 23 are all detachably connected with reinforcing beams 24. In this embodiment, five telescopic longitudinal beams 20 are designed for the double-side wall guide tunnel. In other embodiments, for dark excavation methods such as CRD and CD, the number of telescopic longitudinal beams can be adaptively adjusted and flexibly installed.

[0063] The telescopic beam structure 2 is designed with five telescopic longitudinal beams 20, which can provide more comprehensive installation support points for the hydraulic formwork structure 3 in the circumferential direction. The reinforcing beam 24 is fixedly connected between the five telescopic longitudinal beams 20 to ensure the structural integrity of the telescopic beam structure 2. Figure 6 , Figure 7As shown, there are five hydraulic formwork structures 3, which are an upper hydraulic formwork structure 31, an upper corner hydraulic formwork structure 32, a middle side hydraulic formwork structure 33, a lower side hydraulic formwork structure 34, and a lower corner hydraulic formwork structure 35. The upper hydraulic formwork structure 31 is installed on the upper telescopic longitudinal beam 21, the upper corner hydraulic formwork structure 32 and the middle side hydraulic formwork structure 33 are both installed on the middle side telescopic longitudinal beam 22, and the lower side hydraulic formwork structure 34 and the lower corner hydraulic formwork structure 35 are both installed on the lower side telescopic longitudinal beam 23.

[0064] Specifically, the hydraulic formwork structure 3 includes a hydraulic jack 301, a jacking support 302, a segmented formwork 303 and an extension driver 304. One end of the hydraulic jack 301 is detachably connected to the telescopic beam structure 2, the jacking support 302 is installed on the other end of the hydraulic jack 301, the segmented formwork 303 is hingedly connected to the outside of the jacking support 302, and the extension driver 304 is connected between the hydraulic jack 301 and the segmented formwork 303.

[0065] like Figures 8 to 10 As shown, the hydraulic top column 301 of the upper hydraulic formwork structure 31 is vertically extended and arranged on the upper telescopic longitudinal beam 21, the hydraulic top column 301 of the upper corner hydraulic formwork structure 32 is vertically extended and arranged on the middle telescopic longitudinal beam 22, the hydraulic top column 301 of the middle hydraulic formwork structure 33 is horizontally extended and arranged on the middle telescopic longitudinal beam 22, the hydraulic top column 301 of the lower hydraulic formwork structure 34 is horizontally extended and arranged on the lower telescopic longitudinal beam 23, and the hydraulic top column 301 of the lower corner hydraulic formwork structure 35 is vertically extended and arranged on the lower telescopic longitudinal beam 23.

[0066] The upper hydraulic formwork structure 31 and the upper corner hydraulic formwork structure 32 generate an upward supporting force through the segmented template 303, the middle side hydraulic formwork structure 33 and the lower side hydraulic formwork structure 34 generate a lateral supporting force through the segmented template 303, and the lower corner hydraulic formwork structure 35 generates a downward supporting force through the segmented template 303. In addition, the upper telescopic longitudinal beam 21 and the two middle side telescopic longitudinal beams 22 are distributed in a triangular shape in the cross section of the telescopic beam structure 2, and a T-shaped reinforcing beam 240 is detachably connected between the upper telescopic longitudinal beam 21 and the two middle side telescopic longitudinal beams 22, which can improve the force reliability of the upper telescopic longitudinal beam 21.

[0067] In this embodiment, the top pressure support 302 is hingedly installed on the other end of the hydraulic top column 301, and the hinge axis of the top pressure support 302 is arranged parallel to the length direction of the trolley body 1; the top pressure support 302 is located on both sides of the hinge axis and two segmented templates 303 are respectively arranged. When in the expanded position, the two segmented templates 303 and the top pressure support 302 are connected to form a second lining template segment that matches the contour of the primary support 5.

[0068] The lower corner hydraulic formwork structure 35 further includes a bottom formwork 305, one side of which is hingedly connected to the edge of the segmented formwork 303 of the lower corner hydraulic formwork structure 35, and a bottom driver 306 is further connected between the bottom formwork 305 and the segmented formwork 303 of the lower corner hydraulic formwork structure 35. The bottom formwork 305 is used to expand the support area of ​​the segmented formwork 303 of the lower corner hydraulic formwork structure 35, thereby ensuring the circumferential integrity of the secondary lining formwork structure.

[0069] In addition, a force transmission bracket 30 can be detachably installed on one side of the top pressure support 302 away from the hydraulic top column 301. Fig.11 As shown, the force transmission bracket 30 is used to support and cooperate with the inner wall of the primary support 5. The hydraulic jack 301 can drive the jacking support 302 and the force transmission bracket 30 to extend outward, so that the force transmission bracket 30 and the inner wall of the primary support 5 are supported and cooperated, and a reliable internal support force is formed from the telescopic beam structure 2, the hydraulic jack 301, the jacking support 302 to the force transmission bracket 30, ensuring the stable force conversion when the middle partition 50 is removed.

[0070] The force transmission corbel 30 includes two end plates 307, a web 308 and a rib 309. The two end plates 307 are arranged in parallel and spaced apart. The web 308 and the rib 309 are fixedly connected between the two end plates 307. The web 308 is fixedly connected with a spoiler 300 between the two end plates 307, and the spoiler 300 protrudes from the outer contour of the two end plates 307. One end plate 307 is detachably connected to the top pressure support 302 with a fastening bolt. The web 308 and the rib 309 strengthen the force transmission corbel 30, ensuring the ability of the support to resist deformation under force. The force transmission corbel 30 and the top pressure support 302 are fixedly connected with fastening bolts, which is convenient for disassembly and assembly.

[0071] The construction method of the formwork trolley for the dark excavation secondary lining includes the following steps:

[0072] S1, such as Figure 1 As shown, the trolley body 1 is installed in place in the guide hole of the primary support 5 corresponding to the trolley section a, and the trolley body 1 is stopped and limited, and a waterproof layer is laid on the inner wall of the primary support 5 of the secondary lining structure 6 to be constructed, and the secondary lining structure 6 to be constructed corresponds to the first construction section b;

[0073] S2, start the longitudinal driver 17 to push the telescopic beam structure 2 forward to the second lining structure 6 to be constructed, that is, the first construction section b, and control the top support leg 4 to move to the top pressure state, such as Figure 2 As shown, the top support leg 4 cooperates with the inner wall top support of the primary support 5 of the secondary lining structure 6 to be constructed, and the hydraulic formwork structure 3 is installed;

[0074] S3, opening the hydraulic formwork structure 3, the force transmission bracket 30 of the hydraulic formwork structure 3 cooperates with the inner wall top support of the primary support 5 of the secondary lining structure 6 to be constructed;

[0075] S4, dismantling the middle partition wall 50 of the second lining structure 6 to be constructed, that is, dismantling the middle partition wall of the first construction section b, and applying a complete closed waterproof layer;

[0076] S5, tying steel bars in the secondary lining area, unfolding the segmented formwork 303, forming a secondary lining formwork structure on the inner side of the secondary lining structure 6, and pouring secondary lining concrete;

[0077] S6, after the secondary lining concrete solidifies to the designed strength, the hydraulic formwork structure 3 and the segmented formwork 303 are retracted, and the stop limit of the trolley body 1 is released, such as Figure 3 As shown, the top support leg 4 remains fixed, the telescopic beam structure 2 is controlled to retract, and the trolley body 1 moves forward, thereby achieving the purpose of moving the trolley section a forward to reach the original first construction section b.

[0078] S7, after the trolley body 1 moves to the set position, Figure 4 As shown, the top support leg 4 is adjusted to the retracted state, the trolley body 1 is stopped and limited, and the longitudinal drive 17 is started to push the telescopic beam structure 2 forward to the next section of the primary support 5, so that the second lining structure 6 can be applied to the second construction section c and the middle partition wall 50 can be removed, and steps S2 to S7 are repeated.

[0079] The construction method of the formwork trolley for the second lining of a dark excavation according to the embodiment of the present invention is the same as the specific embodiment of the construction method of the formwork trolley for the second lining of a dark excavation according to the above-mentioned embodiment of the invention, and will not be described in detail here.

[0080] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A formwork trolley for dark excavation secondary lining, characterized in that: It includes a trolley body, a telescopic beam structure, a plurality of hydraulic formwork structures and a plurality of top legs, wherein the trolley body can be movably arranged in the guide hole of the primary support, and the telescopic beam structure is telescopically connected to the trolley body parallel to the length direction of the trolley body; The telescopic beam structure includes at least three telescopic longitudinal beams and a reinforcing beam, wherein the at least three telescopic longitudinal beams are arranged in parallel with the length direction of the trolley body, and the reinforcing beam is detachably connected between the at least three telescopic longitudinal beams, and the reinforcing beam is used to penetrate and cooperate with the middle partition wall; A plurality of the hydraulic formwork structures are detachably mounted on the telescopic beam structure, and the plurality of the hydraulic formwork structures are circumferentially spaced around the cross section of the telescopic beam structure, and the hydraulic formwork structures have an extended position and a retracted position; The plurality of top legs are respectively installed at the ends of the telescopic beam structure away from the trolley body, and the plurality of top legs are circumferentially spaced around the cross section of the telescopic beam structure, and the top legs have a top pressing state in cooperation with the top support of the inner wall of the primary support, and a contracted state in which they are separated from the inner wall of the primary support; When the secondary lining is poured, the top legs are in a top pressing state, the hydraulic formwork structure is in an extended position and forms a secondary lining formwork structure distributed around the outer side of the telescopic beam structure; After the second lining is poured, the hydraulic formwork structure is in the retracted position, the top support legs are in the top pressing state, and the telescopic beam structure is retracted to allow the trolley body to move forward; the trolley body moves forward to its position, the top support legs remain in the retracted state, and the telescopic beam structure is pushed forward to enter the next section of primary support.

2. The formwork trolley for the secondary lining of dark excavation according to claim 1 is characterized in that: The lower part of the trolley body is equipped with rollers, the lower side of the trolley body is provided with longitudinal tracks, the rollers are rollingly assembled on the longitudinal tracks, and the trolley body is also equipped with a limit plate for cooperating with the longitudinal tracks.

3. The formwork trolley for the secondary lining of dark excavation according to claim 1 is characterized in that: The trolley body includes at least three trolley longitudinal beams, which are spaced apart and parallel to the length direction of the trolley body. A telescopic channel for sliding and assembling the telescopic longitudinal beam is provided inside the trolley longitudinal beam, and a longitudinal drive is also provided between the trolley longitudinal beam and the telescopic longitudinal beam.

4. The formwork trolley for the secondary lining of dark excavation according to claim 3 is characterized in that: The trolley longitudinal beams are provided with five, which are respectively an upper trolley longitudinal beam, two middle trolley longitudinal beams and two lower trolley longitudinal beams. The upper trolley longitudinal beam is arranged on the middle upper side of the two middle trolley longitudinal beams, and the two lower trolley longitudinal beams are arranged correspondingly on the lower sides of the two middle trolley longitudinal beams. Structural beams are fixedly connected between the upper trolley longitudinal beam and the middle trolley longitudinal beam, between the middle trolley longitudinal beam and the lower trolley longitudinal beam, between the two middle trolley longitudinal beams, and between the two lower trolley longitudinal beams.

5. The formwork trolley for the secondary lining of dark excavation according to claim 4 is characterized in that: There are five telescopic longitudinal beams, which are an upper telescopic longitudinal beam, two middle telescopic longitudinal beams and two lower telescopic longitudinal beams. The upper telescopic longitudinal beam is arranged on the middle upper side of the two middle telescopic longitudinal beams, and the two lower telescopic longitudinal beams are arranged on the lower sides of the two middle telescopic longitudinal beams respectively. The reinforcing beams are detachably connected between the upper telescopic longitudinal beam and the two middle telescopic longitudinal beams, between the middle telescopic longitudinal beam and the lower telescopic longitudinal beam, between the two middle telescopic longitudinal beams, and between the two lower telescopic longitudinal beams.

6. The formwork trolley for the secondary lining of dark excavation according to claim 5 is characterized in that: The hydraulic formwork structures are provided with five, namely, an upper hydraulic formwork structure, an upper corner hydraulic formwork structure, a middle side hydraulic formwork structure, a lower side hydraulic formwork structure, and a lower corner hydraulic formwork structure. The upper hydraulic formwork structure is installed on the upper telescopic longitudinal beam, the upper corner hydraulic formwork structure and the middle side hydraulic formwork structure are both installed on the middle side telescopic longitudinal beam, and the lower side hydraulic formwork structure and the lower corner hydraulic formwork structure are both installed on the lower side telescopic longitudinal beam.

7. The formwork trolley for the secondary lining of dark excavation according to claim 1 is characterized in that: The hydraulic formwork structure includes a hydraulic jack, a jacking support, a segmented formwork and an extension driver. One end of the hydraulic jack is detachably connected to the telescopic beam structure, the jacking support is installed on the other end of the hydraulic jack, the segmented formwork is hingedly connected to the outside of the jacking support, and the extension driver is connected between the hydraulic jack and the segmented formwork.

8. The formwork trolley for the secondary lining of dark excavation according to claim 7 is characterized in that: The top pressure support is hingedly installed on the other end of the hydraulic jack, and the hinge axis of the top pressure support is arranged parallel to the length direction of the trolley body; the top pressure support is located on both sides of the hinge axis and two segmented templates are respectively arranged. When in the expanded position, the two segmented templates and the top pressure support are connected to form a second lining template segment matching the primary support profile.

9. The formwork trolley for the secondary lining of dark excavation according to claim 7 is characterized in that: A force transmission corbel is detachably mounted on a side of the jacking support away from the hydraulic jacking column, and the force transmission corbel is used to cooperate with the inner wall support of the primary support.

10. A construction method of a formwork trolley for a dark excavation secondary lining according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Install the trolley body in the guide hole of the primary support, stop and limit the trolley body, and lay a waterproof layer on the inner wall of the primary support of the secondary lining structure to be constructed; S2, start the longitudinal drive to push the telescopic beam structure forward to the second lining structure to be constructed, control the top support leg to move to the top pressure state, the top support leg cooperates with the inner wall top support of the primary support of the second lining structure to be constructed, and install the hydraulic formwork structure; S3, opening the hydraulic formwork structure, and the force transmission bracket of the hydraulic formwork structure cooperates with the inner wall top support of the primary support of the secondary lining structure to be constructed; S4. Remove the middle partition wall of the secondary lining structure to be constructed and apply a complete closed waterproof layer; S5. Tie steel bars in the secondary lining area, unfold the segmented formwork, form a secondary lining formwork structure on the inner side of the secondary lining structure, and pour the secondary lining concrete; S6. After the secondary lining concrete solidifies and reaches the designed strength, the hydraulic formwork structure and the segmented formwork are retracted, the stop limit of the trolley body is released, the top legs are kept fixed, the telescopic beam structure is controlled to retract, and the trolley body moves forward; S7, after the trolley body moves to the set position, the top support leg is adjusted to the retracted state, the trolley body is stopped and limited, the longitudinal drive is started to push the telescopic beam structure forward to the next section of the primary support, and steps S2 to S7 are repeated.

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