Secondary lining trolley device of self-adaptive variable cross-section tunnel and construction method of secondary lining trolley device

Abstract

The invention discloses a secondary lining trolley device of a self-adaptive variable cross-section tunnel and a construction method of the secondary lining trolley device, and belongs to the technical field of tunnel construction equipment. The secondary lining trolley device comprises a portal frame body, side formworks connected to the two sides of the portal frame body, a top formwork frame body arranged on the upper side of the portal frame body and a top formwork connected to the upper side of the top formwork frame body; the top die comprises a main die plate and two auxiliary die plates in sliding fit with the main die plate, openings are formed in the two ends of the main die plate, the upper ends of the auxiliary die plates are installed in the openings in a sliding mode, and the lower ends of the auxiliary die plates are hinged to the side dies. The top formwork body comprises a main cross beam and an auxiliary cross beam in sliding fit with the main cross beam, sliding seats are installed on the main cross beam and the auxiliary cross beam in a sliding mode, the sliding seats are connected to the main formwork or the auxiliary formwork through telescopic supporting structures, and installation seats connected with the telescopic supporting structures are formed on the inner sides of the main formwork and the auxiliary formwork. And the sliding seat is fixed with the main cross beam or the auxiliary cross beam through a locking piece. By means of the device and the method, the variable cross-section construction operation task can be completed more efficiently and better.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel construction equipment, and in particular relates to a secondary lining trolley device for an adaptive variable-section tunnel and a construction method thereof. Background Art

[0002] In tunnel construction, secondary lining is an extremely critical link, which determines the safety and stability of the tunnel after opening to traffic. With the advancement of science and technology, the technology of tunnel lining trolleys is also constantly developing and improving; modern tunnel lining trolleys are usually equipped with advanced electrical systems, hydraulic systems and control systems, which can realize automated and intelligent construction, further improving construction efficiency and quality. At the same time, the structure and design of tunnel lining trolleys are also constantly optimized and improved to meet the needs of different tunnel construction conditions.

[0003] In the structural pouring of the large-section secondary lining concrete of the tunnel, the mature technology of the formwork trolley is generally used. The formwork trolley, as a device for transporting formwork, is usually composed of a frame, tires, joysticks, brakes, tow hooks and ropes, etc., and is mainly used for loading and unloading formwork. Nowadays, because the cross-section of the widened tunnel is larger than that of the normal tunnel, and the project contains 4 different span sections, the use of conventional steel formwork trolleys will not only result in a large workload, but also take a lot of time, seriously affecting the construction progress. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a secondary lining trolley device for an adaptive variable-section tunnel and a construction method thereof, which can complete the variable-section construction task more efficiently and with higher quality.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: The present invention discloses a secondary lining trolley device for an adaptive variable-section tunnel, comprising a portal body, side molds connected to both sides of the portal body, a top mold frame body arranged on the upper side of the portal body, and a top mold connected to the upper side of the top mold frame body, the portal body comprising a main portal, a sub-portal slidably arranged on the side of the main portal, and a lateral pushing device connected to the sub-portal, the side mold being connected to the sub-portal; the top mold comprising a main template, two sub-templates slidably matched with the main template, openings being formed at both ends of the main template, the upper end of the sub-template being slidably installed in the opening, and the lower end of the sub-template being hinged to the side mold; the top mold frame comprising a main crossbeam, a sub-crossbeam slidably matched with the main crossbeam, a sliding seat being slidably installed on the main crossbeam and the sub-crossbeam, the sliding seat being connected to the main template or the sub-template through a telescopic support structure, a mounting seat connected to the telescopic support structure being formed on the inner side of the main template and the sub-template, and the sliding seat being fixed to the main crossbeam or the sub-crossbeam through a locking member.

[0006] Furthermore, a rolling support device for supporting the top mold frame is installed on the portal body, and the rolling support device includes a plurality of rollers, a rotating shaft, a scissors fork structure and two limit plates. The rollers are evenly spaced along the horizontal direction, and the rollers are connected by a laterally arranged scissors fork structure. The rollers are fixedly connected to the rotating shaft, and the rotating shaft is rotatably connected to the upper hinge point of the scissors fork. The two ends of the scissors fork structure cooperate with the limit plates, and the limit plates are fixed on the sub-portal; the rollers are used to support the main beam and the sub-beam.

[0007] Furthermore, a ratchet is installed on the rotating shaft corresponding to the main portal, and the ratchet is connected with a pawl. The pawl is rotatably installed on a slider, and an elastic support member for supporting the pawl is installed on the slider. The slider is slidably set on the main portal, and a rotating hole that cooperates with the rotating shaft is opened on the slider.

[0008] Furthermore, one of the limit plates is connected to the main crossbeam, and the other limit plate is connected to the secondary crossbeam, and the main crossbeam and the secondary crossbeam are fixed by a locking member.

[0009] Furthermore, a convex ridge is fixed on the inner side of the auxiliary template, and an open groove cooperating with the convex ridge is formed on the inner side of the main template. The convex ridge extends out of the open groove and is connected to the telescopic support structure.

[0010] Furthermore, both ends of the top formwork frame are connected to the auxiliary formwork through telescopic devices.

[0011] Furthermore, the telescopic support structure includes a top mold jack and a column, the top mold jack is fixed on a slide, the output end of the top mold jack is connected to the column, and the column is hinged to the mounting seat.

[0012] Furthermore, the lower end of the sub-gantry is supported by a sub-gantry jack, and the lateral pushing device includes a displacement block, a guide rail and a hydraulic cylinder. The sub-gantry jack is installed on the displacement block, the displacement block is slidably matched with the guide rail, the hydraulic cylinder is fixed to the guide rail, and the output end of the hydraulic cylinder is connected to the displacement block.

[0013] A construction method of a secondary lining trolley device for an adaptive variable cross-section tunnel, using the secondary lining trolley device as described in any one of the above, the construction process includes the following steps: The first step is to place the support jack of the portal frame on the rail and tighten it after the trolley reaches the lining position; The second step is to adjust the vertical oil cylinder to drive the gantry body to rise; adjust the top mold to make it close to the predetermined height; The third step is to adjust the top mold frame so that its center line is aligned with the center line of the lining, and then operate the manual reversing valve to raise the vertical cylinder to the predetermined position, move the slide, adjust the main template and the auxiliary template to the specified position, lock the slide and tighten the top mold limit device; The fourth step is to operate the lateral pushing device; roughly adjust the auxiliary frame and the side mold of the steel mold trolley to the predetermined position; Step 5: Install and tighten the side screw of the side mold; Step 6: Adjust the lateral jack to make the side form of the steel formwork trolley reach the pouring state; Step 7: Install the ground screw jack, plug plate and tighten the template limit device; Step 8: When grouting, grouting is first performed from the bottom row of working windows of the steel formwork trolley formwork. When the concrete is almost flush with the working windows, the working windows are closed, and then grouting is performed from the second row of working windows, and so on, and finally the top is sealed through the grouting port; Step 9: After the concrete solidifies for a certain period of time, remove the lateral and ground screw jacks and plug plates; start the hydraulic system, operate the manual reversing valve handle, control the lateral oil cylinder, and separate the side formwork of the steel formwork trolley from the lining surface; Step 10: Retract the top mold support jack and the template limit device; Step 11: operate the manual reversing valve handle to control the vertical oil cylinder; make the steel template surface of the steel template trolley completely separate from the lining surface; the cylinder is retracted in batches, and the cylinder retraction stroke is 180mm to 250mm; Step 12. After the steel formwork trolley is demolded, first retract the gantry support jack, then tighten the top formwork support jack and the formwork limit device, and start the travel motor.

[0014] The beneficial effects of the present invention are: The present invention discloses a secondary lining trolley device for an adaptive variable cross-section tunnel. By setting a main portal and a secondary portal, when encountering a tunnel construction with a small-to-large cross-section, the secondary portal can provide a retractable support for the side mold, which is easy to adjust. By setting a top mold with a variable curvature and length, it can adapt to the construction changes of tunnel tops with different curvatures, thereby completing the variable cross-section construction task more efficiently and with higher quality, saving additional material costs.

[0015] In the device disclosed in the present invention, a sliding seat is provided, and the sliding seat cooperates with a telescopic support structure to assist the top mold to bend and change, so that it can adapt to the construction needs of variable-section tunnels and is more convenient to use. A set of devices can adapt to changes in 4 or more different span sections, greatly saving construction costs and improving the efficiency of tunnel construction.

[0016] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 It is a structural schematic diagram of the secondary lining trolley device of the present invention; Figure 2 This is a front view of the secondary lining trolley device of the present invention; Figure 3 Schematic diagram of the arrangement of the rollers; Figure 4 It is a structural schematic diagram of the secondary template; Figure 5 for Figure 1 The enlarged view of point A in the middle; Figure 6 for Figure 1 The enlarged view of point B in the middle; Figure 7 for Figure 3 Enlarged view of point C in the middle.

[0018] The markings in the accompanying drawings are as follows: portal frame body 1, side mold 2, top mold frame body 3, top mold 4, main portal 5, auxiliary portal 6, lateral pushing device 7, main mold plate 8, auxiliary mold plate 9, opening 10, main crossbeam 11, auxiliary crossbeam 12, slide seat 13, telescopic support structure 14, roller 15, rotating shaft 16, scissors fork structure 17, limit plate 18, ratchet 19, pawl 20, slider 21, elastic support member 22, convex ridge 23, opening groove 24, telescopic device 25, top mold jack 26, column 27, mounting seat 28, auxiliary portal jack 29, displacement block 30, guide rail 31, hydraulic cylinder 32. DETAILED DESCRIPTION

[0019] like Figures 1 to 7As shown, the second lining trolley device of an adaptive variable cross-section tunnel disclosed in the present invention comprises a portal body 1, side molds 2 connected to both sides of the portal body 1, a top mold frame 3 arranged on the upper side of the portal body 1, and a top mold 4 connected to the upper side of the top mold frame 3. The portal body 1 is in a door shape as a whole, used to support the overall device, the side molds 2 are divided into two groups, arranged on both sides of the portal body 1, and the top mold frame 3 is located on the upper side of the portal body 1, used to support the top mold 4, the combination of the side molds 2 and the top mold 4 is a group, and multiple groups are arranged along the longitudinal direction. The adjacent two groups are sealed by rubber to form a complete set of trolley templates. The following is introduced through the template of one group, which is convenient for a complete display of the structure of the present invention application.

[0020] Among them, the gantry body 1 disclosed in the present invention includes a main gantry 5, a sub-gantry 6 slidably arranged on the side of the main gantry 5, and a transverse pushing device 7 connected to the sub-gantry 6. The sub-gantry 6 can move laterally, and the side mold 2 is connected to the sub-gantry 6 and supported by the side mold 2, so as to adapt to the width changes of tunnels with different cross-sections; the transverse pushing device 7 provides power for the movement of the sub-gantry 6. After the sub-gantry 6 is moved, the sub-gantry 6 can be locked with the main gantry 5 to avoid slippage between the two.

[0021] In some other embodiments, a guide rod is installed on the side of the sub-gantry 6 facing the main gantry 5. The guide rod slides in a guide rod seat provided on the main gantry 5. The guide rod plays a guiding role through the sliding fit between the guide rod and the guide rod seat. The locking can be performed by bolts.

[0022] Furthermore, the top formwork 4 disclosed in the present invention includes a main formwork 8 and two sub-formworks 9 that are slidably matched with the main formwork 8. Both the main formwork 8 and the sub-formwork 9 are made of spring steel and have a certain elastic recovery ability, and can be deformed to a certain extent to adapt to the change of the curvature of the tunnel top. Openings 10 are formed at both ends of the main formwork 8, and the openings 10 extend from the middle of the main formwork 8 along the outer end of the main formwork 8. The upper end of the sub-formwork 9 is slidably installed in the opening 10, and the lower end of the sub-formwork 9 is hinged to the side formwork 2; both sides of the sub-formwork 9 are flush with the main formwork 8 to adapt to the sealed splicing between different groups of formworks, which is convenient for construction.

[0023] The top formwork frame 3 includes a main crossbeam 11 and a secondary crossbeam 12 that is slidably matched with the main crossbeam 11. The main crossbeam 11 and the secondary crossbeam 12 are both extended in the transverse direction. A slide 13 is slidably mounted on the main crossbeam 11 and the secondary crossbeam 12. The upper side of the slide 13 is connected to the main formwork 8 or the secondary formwork 9 through a telescopic support structure 14. The telescopic support structure 14 can be telescoped in the vertical direction to adapt to the changes in the different heights of the support points when the top formwork 4 changes. Correspondingly, a mounting seat 28 connected to the telescopic support structure 14 is formed on the inner side of the main formwork 8 and the secondary formwork 9. The slide 13 is fixed to the main crossbeam 11 or the secondary crossbeam 12 by a locking member. The present invention provides a slide 13 that can slide. The slide 13 cooperates with the telescopic support structure 14 to assist the top formwork 4 in bending changes, so that it can adapt to the construction needs of variable-section tunnels and is more convenient to use. A set of devices can adapt to the changes of various different span sections, greatly saving construction costs and improving the efficiency of tunnel construction.

[0024] In this embodiment, a rolling support device for supporting the top formwork frame 3 is installed on the portal frame body 1. The rolling support device facilitates the top formwork frame 3 to provide support for it when it is extended and retracted, reduces resistance, does not need to be disassembled and reinstalled, and saves costs. Specifically, the rolling support device of the present invention includes a plurality of rollers 15, a rotating shaft 16, a scissor fork structure 17 and two limit plates 18. The rollers 15 are evenly spaced along the horizontal direction, and the rollers 15 extend along the longitudinal direction of the tunnel. The rollers 15 are connected by the scissor fork structure 17 arranged horizontally. The rollers 15 are fixedly connected to the rotating shaft 16, and the rotating shaft 16 is rotatably connected to the upper hinge point of the scissor fork. The two ends of the scissor fork structure 17 cooperate with the limit plates 18. The limit plates 18 are provided with sliding grooves, which cooperate with the pins of a group of connecting rods of the scissor fork structure 17 to adapt to the extension and retraction of the scissor fork. The limit plates 18 are fixed on the auxiliary portal frame 6; the rollers 15 are used to support the main beam 11 and the auxiliary beam 12.

[0025] It is understandable that the scissor fork structure 17 disclosed in the present application belongs to an existing structure, such as a hydraulic lift, etc., including two groups of connecting rods arranged in an X shape, and the head and tail hinges between the connecting rods can provide stability for the lateral displacement of the roller 15. When the auxiliary door frame 6 moves in the lateral extension and contraction, it can drive the limit plate 18 to move, and the limit plates 18 at both ends move synchronously, and can also drive the roller 15 to expand or close in the lateral direction to adapt to the width changes of tunnels with different cross-sections.

[0026] In this embodiment, a ratchet 19 is installed on the rotating shaft 16 corresponding to the main portal 5, and the ratchet 19 is connected with a pawl 20. The pawl 20 is rotatably installed on a slider 21. The slider 21 is installed with an elastic support member 22 for supporting the pawl 20. The slider 21 is slidably set on the main portal 5, and a rotating hole that cooperates with the rotating shaft 16 is opened on the slider 21. By setting the coordination of the ratchet 19 and the pawl 20, the roller 15 can be rotated in one direction. When the secondary beam 12 extends outward, it is prevented from moving back in the reverse direction, which can increase the stability of the structure when in use, and can also facilitate the positioning of the moving position of the secondary beam 12, which is convenient for subsequent locking. One of the limit plates 18 is connected to the main beam 11, and the other limit plate 18 is connected to the secondary beam 12. The main beam 11 and the secondary beam 12 are fixed by a locking member. By connecting the beam with the limit plate 18, the telescopic change of the top mold frame 3 is also facilitated.

[0027] In this embodiment, a convex rib 23 is fixed on the inner side of the secondary template 9, and an open groove 24 that cooperates with the convex rib 23 is formed on the inner side of the main template 8. The convex rib 23 extends out of the open groove 24 and is connected to the telescopic support structure 14. By setting the cooperation between the convex rib 23 and the open groove 24, the secondary template 9 can be limited to prevent the secondary template 9 from deviating from the side of the main template 8. The partial telescopic support structure 14 supports the secondary template 9 through the convex rib 23, which can drive the secondary template 9 to adapt to the change of the curvature of the tunnel top to a certain extent, reduce the curvature difference between the two, so that the bending changes of the secondary template 9 and the main template 8 can correspond, and the extension and contraction of the secondary template 9 is smoother.

[0028] In this embodiment, both ends of the top formwork body 3 are connected to the auxiliary formwork 9 through telescopic devices 25, which is more conducive to controlling the bending change of the auxiliary formwork 9.

[0029] In this embodiment, the telescopic support structure 14 includes a top mold jack 26 and a column 27. The top mold jack 26 is fixed on the slide 13, and the output end of the top mold jack 26 is connected to the column 27. The column 27 is hinged with the mounting seat 28. In specific use, if the cross-section of the tunnel becomes larger and the top curvature becomes smaller, the top mold 4 needs to be stretched outward and deformed. The mounting seat 28 on the top mold 4 moves outward when stretched, thereby moving the slide 13 to correspond to the displacement of the mounting seat 28 to meet the support needs of different positions. After the mounting seat 28 is connected to the telescopic support structure 14, under the sliding support of the slide 13, the main template 8 or the auxiliary template 9 can also be driven to deform, and the support posture can be conveniently adjusted until the actual construction needs of the tunnel are met.

[0030] In this embodiment, the lower end of the auxiliary gantry 6 is supported by the auxiliary gantry jack 29, and the lateral pushing device 7 includes a displacement block 30, a guide rail 31 and a hydraulic cylinder 32. The auxiliary gantry jack 29 is installed on the displacement block 30, the displacement block 30 is slidably matched with the guide rail 31, the hydraulic cylinder 32 is fixed to the guide rail 31, and the output end of the hydraulic cylinder 32 is connected to the displacement block 30. The displacement block 30 is driven to move by the hydraulic cylinder 32, and the lateral position of the auxiliary gantry 6 can be driven to adjust, which is easy to operate.

[0031] A construction method for a secondary lining trolley device of an adaptive variable cross-section tunnel, using any of the secondary lining trolley devices described above, the construction process comprising the following steps: In the first step, after the trolley reaches the lining position, the support jack of the portal frame body 1 is supported on the rail and tightened; The second step is to adjust the vertical oil cylinder to drive the gantry body 1 to rise; adjust the top mold 4 to make it close to the predetermined height; The third step is to adjust the top mold frame 3 so that its center line is aligned with the lining center line, and then operate the manual reversing valve to raise the vertical cylinder to the predetermined position, move the slide 13, adjust the main template 8 and the auxiliary template 9 to the specified position, lock the slide 13 and tighten the top mold 4 limit device; Step 4: operate the lateral push device 7; roughly adjust the auxiliary frame and the side mold 2 of the steel mold trolley to the predetermined position; Step 5: Install and tighten the lateral screw of the side mold 2; Step 6: Adjust the lateral jack to make the side form 2 of the steel formwork trolley reach the pouring state; Step 7: Install the ground screw jack, plug plate and tighten the template limit device; Step 8: When grouting, grouting is first performed from the bottom row of working windows of the steel formwork trolley formwork. When the concrete is almost flush with the working windows, the working windows are closed, and then grouting is performed from the second row of working windows, and so on, and finally the top is sealed through the grouting port; Step 9: After the concrete solidifies for a certain period of time, remove the lateral and ground screw jacks and plugging plates; start the hydraulic system, operate the manual reversing valve handle, control the lateral oil cylinder, and separate the side formwork 2 of the steel formwork trolley from the lining surface; Step 10: Retract the top mold 4 support jack and the template limit device; Step 11: operate the manual reversing valve handle to control the vertical oil cylinder; make the steel template surface of the steel template trolley completely separate from the lining surface; the cylinder is retracted in batches, and the cylinder retraction stroke is 180mm to 250mm; Step 12: After the steel formwork trolley is demoulded, first retract the gantry support jack, then tighten the top form 4 support jack and the formwork limit device, and start the travel motor.

[0032] In this embodiment, in the first step, the steel formwork trolley can erect the formwork after it moves to the lining position, and the steel formwork trolley is in a demoulding state before erecting the formwork.

[0033] In this embodiment, after the seventh step, the outer surface of the steel template trolley needs to be coated with a release agent before grouting to reduce the surface adhesion during demoulding. And before each grouting, the lead screw and the jack should be checked for looseness to prevent the trolley from deforming during grouting.

[0034] In this embodiment, in the eighth step, the height difference of the concrete in front and behind the steel formwork trolley is required not to exceed 1100mm; the height difference of the concrete on the left and right sides is required not to exceed 1100mm; in the late stage of grouting and capping through the grouting port, low speed gear must be used for grouting, and attention must be paid to the changes in the pressure at the grouting port at all times to avoid deformation of the formwork due to excessive pressure caused by forced injection after the concrete is full.

[0035] In this embodiment, in the twelfth step, the steel formwork trolley must be completely still before it can change direction; and when the track slope is too large and causes the trolley to slip, some dry fine sand can be sprinkled on the track surface to increase the adhesion and eliminate the slipping phenomenon. The four working processes of formwork erection, grouting, demoulding, and walking are repeated to complete the entire operation of the steel formwork trolley.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A secondary lining trolley device for an adaptive variable cross-section tunnel, comprising a portal frame, side molds connected to both sides of the portal frame, a top mold frame arranged on the upper side of the portal frame, and a top mold connected to the upper side of the top mold frame, characterized in that: The portal frame body includes a main portal, a sub-portal slidably arranged on the side of the main portal, and a lateral pushing device connected to the sub-portal, and the side mold is connected to the sub-portal; the top mold includes a main mold and two sub-templates slidably matched with the main mold, and openings are formed at both ends of the main mold. The upper end of the sub-template is slidably installed in the opening, and the lower end of the sub-template is hinged to the side mold; the top mold frame body includes a main crossbeam and a sub-beam slidably matched with the main crossbeam, and slides are slidably installed on the main crossbeam and the sub-beam, and the slide is connected to the main mold or the sub-template through a telescopic support structure. The inner side of the main mold and the sub-template is formed with a mounting seat connected to the telescopic support structure, and the slide is fixed to the main crossbeam or the sub-beam by a locking member.

2. The second lining trolley device for an adaptive variable cross-section tunnel according to claim 1, characterized in that: A rolling support device for supporting the top mold frame is installed on the portal body, and the rolling support device includes a plurality of rollers, a rotating shaft, a scissor fork structure and two limit plates. The rollers are evenly spaced in the horizontal direction, and the rollers are connected by a laterally arranged scissor fork structure. The rollers are fixedly connected to the rotating shaft, and the rotating shaft is rotatably connected to the upper hinge point of the scissor fork. Both ends of the scissor fork structure cooperate with the limit plates, and the limit plates are fixed on the sub-portal; the rollers are used to support the main beam and the sub-beam.

3. The second lining trolley device for an adaptive variable cross-section tunnel according to claim 2 is characterized in that: A ratchet is installed on the rotating shaft corresponding to the main portal, and the ratchet is connected with a pawl. The pawl is rotatably installed on a sliding block, and an elastic support member for supporting the pawl is installed on the sliding block. The sliding block is slidably set on the main portal, and a rotating hole cooperating with the rotating shaft is opened on the sliding block.

4. The second lining trolley device for an adaptive variable cross-section tunnel according to claim 3 is characterized in that: One of the limit plates is connected to the main crossbeam, and the other limit plate is connected to the auxiliary crossbeam. The main crossbeam and the auxiliary crossbeam are fixed by a locking piece.

5. The secondary lining trolley device for an adaptive variable cross-section tunnel according to claim 1, characterized in that: A convex rib is fixed on the inner side of the auxiliary template, an open groove matching with the convex rib is formed on the inner side of the main template, and the convex rib extends out of the open groove and is connected to the telescopic support structure.

6. The second lining trolley device for an adaptive variable cross-section tunnel according to claim 5, characterized in that: Both ends of the top formwork frame are connected to the auxiliary formwork through telescopic devices respectively.

7. The secondary lining trolley device for an adaptive variable cross-section tunnel according to claim 1, characterized in that: The telescopic support structure comprises a top mold jack and a column, wherein the top mold jack is fixed on a sliding seat, an output end of the top mold jack is connected to the column, and the column is hinged to a mounting seat.

8. A secondary lining trolley device for an adaptive variable cross-section tunnel according to any one of claims 1 to 7, characterized in that: The lower end of the auxiliary gantry is supported by the auxiliary gantry jack, and the lateral pushing device includes a displacement block, a guide rail and a hydraulic cylinder. The auxiliary gantry jack is installed on the displacement block, the displacement block is slidably matched with the guide rail, the hydraulic cylinder is fixed to the guide rail, and the output end of the hydraulic cylinder is connected to the displacement block.

9. A construction method for a secondary lining trolley device for an adaptive variable cross-section tunnel, characterized in that: Using the secondary lining trolley device as described in any one of claims 1 to 8, the construction process The following steps are involved: The first step is to place the support jack of the portal frame on the rail and tighten it after the trolley reaches the lining position; The second step is to adjust the vertical oil cylinder to drive the gantry body to rise; adjust the top mold to make it close to the predetermined height; The third step is to adjust the top mold frame so that its center line is aligned with the center line of the lining, and then operate the manual reversing valve to raise the vertical cylinder to the predetermined position, move the slide, adjust the main template and the auxiliary template to the specified position, lock the slide and tighten the top mold limit device; Step 4: operate the lateral pushing device; roughly adjust the auxiliary frame and the side mold of the steel mold trolley to the predetermined position; Step 5: Install and tighten the side screw of the side mold; Step 6: Adjust the lateral jack to make the side form of the steel formwork trolley reach the pouring state; Step 7: Install the ground screw jack, plug plate and tighten the template limit device; Step 8: When grouting, grouting is first performed from the bottom row of working windows of the steel formwork trolley formwork. When the concrete is almost flush with the working windows, the working windows are closed, and then grouting is performed from the second row of working windows, and so on, and finally the top is sealed through the grouting port; Step 9: After the concrete solidifies for a certain period of time, remove the lateral and ground screw jacks and plug plates; start the hydraulic system, operate the manual reversing valve handle, control the lateral oil cylinder, and separate the side formwork of the steel formwork trolley from the lining surface; Step 10: Retract the top mold support jack and the template limit device; Step 11: operate the manual reversing valve handle to control the vertical oil cylinder; make the steel template surface of the steel template trolley completely separate from the lining surface; the cylinder is retracted in batches, and the cylinder retraction stroke is 180mm to 250mm; Step 12. After the steel formwork trolley is demolded, first retract the gantry support jack, then tighten the top formwork support jack and the formwork limit device, and start the travel motor.

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