Integral cast-in-place construction method for secondary lining of extra-large cross-section tunnel

Abstract

The present application relates to a method for integral cast-in-place construction of secondary lining of a super-large cross-section tunnel, which comprises the following steps: Prefabrication step: fabricate the arc-shaped formwork at the top of the corresponding trolley to match the tunnel cross-section; Positioning and reinforcement step: drive the trolley into the tunnel, align the arc-shaped formwork with the top wall of the tunnel to form an arc-shaped space, and install a steel bar framework in the arc-shaped space; End-face sealing step: arrange sealing devices at both ends of the arc-shaped formwork on the trolley, and automatically seal the two openings at both ends of the arc-shaped space through the sealing devices. Before sealing, release agent is applied to both the arc-shaped formwork and the side of the sealing device close to the arc-shaped space; Pouring step: open the pouring port of the arc-shaped formwork, and then pour concrete into the arc-shaped space; Formwork removal step: after the concrete solidifies, remove the sealing device, and continue to drive the trolley further inward, and repeat the previous steps. The present application has the effect of improving the problem that the construction during secondary lining is relatively troublesome.

Description

Technical Field

[0001] The present application relates to the field of tunnel construction technology, and in particular to a method for integral cast-in-place construction of secondary lining for super-large cross-section tunnels. Background Art

[0002] The secondary lining is a cast-in-place concrete or reinforced concrete lining constructed on the inner side of the initial support during tunnel construction, and together with the initial support, it forms a composite lining. Relatively speaking, the secondary lining refers to the inner lining constructed with materials such as concrete under the condition that the tunnel has been initially supported, so as to achieve the functions of strengthening the support, optimizing the tunnel drainage system, beautifying the appearance, and facilitating the installation of facilities such as communication, lighting, and monitoring, in order to meet the requirements of modern high-speed road tunnel construction.

[0003] During the process of secondary lining, the trolley is driven into the tunnel, then an arc-shaped space for pouring concrete is left between the arc-shaped formwork at the top of the trolley and the inner wall of the tunnel. Then, both ends of the arc-shaped space are closed by multiple wooden boards, and finally, concrete is poured into the arc-shaped space.

[0004] Regarding the above related technology, the inventor believes that when closing both ends of the arc-shaped space with wooden boards during secondary lining, it is necessary to manually install the wooden boards adjacent to each other one by one, resulting in very complex operations. Summary of the Invention

[0005] In order to improve the problem of troublesome construction during secondary lining, the present application provides a method for integral cast-in-place construction of secondary lining for super-large cross-section tunnels.

[0006] The method for integral cast-in-place construction of secondary lining for super-large cross-section tunnels provided by the present application adopts the following technical solutions:

[0007] A method for integral cast-in-place construction of secondary lining for super-large cross-section tunnels includes the following steps:

[0008] Prefabrication step: Corresponding arc-shaped formwork at the top of the trolley is fabricated according to the size of the tunnel cross-section, so that the arc-shaped formwork matches the tunnel cross-section;

[0009] Positioning and reinforcement step: The trolley is driven into the tunnel, an arc-shaped space is formed by aligning the arc-shaped formwork with the top wall of the tunnel, and a steel bar framework is installed in the arc-shaped space;

[0010] End face sealing step: Sealing devices are arranged at both ends of the arc-shaped formwork on the trolley, and the two openings at both ends of the arc-shaped space are automatically sealed by the sealing devices. Before sealing, release agents are coated on both the arc-shaped formwork and the side of the sealing devices close to the arc-shaped space;

[0011] Pouring step: Open the pouring port of the arc-shaped formwork, and then pour concrete into the arc-shaped space;

[0012] Formwork removal step: After the concrete solidifies, remove the blocking device, continue to drive the trolley inward, and repeat the previous steps.

[0013] By adopting the above technical solution, in the above steps, after the arc-shaped formwork on the top of the trolley is aligned with the inner wall surface of the tunnel to form an arc-shaped space, only the blocking device is needed to block the openings at both ends of the arc-shaped space, and there is no need for manual blocking of the openings at both ends of the arc-shaped space with wooden boards, thus greatly reducing the labor intensity of workers, and the blocking is also very easy; by using the blocking device to block the openings at both ends of the arc-shaped space, it can also be quickly moved inward to continue pouring after pouring is completed, which is very convenient.

[0014] Optionally, the blocking device includes a blocking component and a driving component. The driving component is installed at the end of the trolley, and the blocking component is installed on the driving component; the driving component is used to drive the blocking component to move, and the blocking component is used to hermetically cover the end opening of the arc-shaped space after moving.

[0015] By adopting the above technical solution, the driving component is used to move the blocking component, so that the blocking component can move adaptively under manual operation, and the cooperation between the driving component and the blocking component can...

[0016] Optionally, the blocking component includes a side blocking part and a top blocking part, and the driving component includes a top driving part and two side driving parts; the top driving part is used to drive the top blocking part to move in the vertical direction, and the two side driving parts are used to drive the two side blocking parts to approach or move away from each other. The two side blocking parts and one top blocking part block the end opening of the arc-shaped space.

[0017] By adopting the above technical solution, the top driving part first moves the top blocking part vertically upward to the end opening of the arc-shaped space to partially block the end opening of the arc-shaped space; then the two side driving parts are used to drive the two side blocking parts to move away from each other at the same time, and make the two side blocking parts move to the positions covering the end opening of the arc-shaped space; after the movement of the two side blocking parts and one top blocking part, the entire arc-shaped space will be completely blocked, thus achieving the effect of conveniently blocking the end opening of the arc-shaped space.

[0018] Optionally, the top driving part includes a jack and a connecting rod. The jack is installed at the end of the trolley, and the piston rod of the jack extends vertically upward; the connecting rod is coaxially arranged on the piston rod of the jack; the top sealing part includes an arc-shaped top plate, and the end of the connecting rod away from the jack is connected to the arc-shaped top plate, and the radian of the arc-shaped top plate is the same as the cross-sectional radian of the arc-shaped space.

[0019] By adopting the above technical solution, start the jack, so that the piston rod of the jack extends vertically upward, thereby extending the connecting rod vertically upward to push the arc-shaped top plate to move, and then making the arc-shaped top plate gradually approach the end opening of the arc-shaped space, achieving the effect of being more convenient and intuitive to drive the arc-shaped top plate to move.

[0020] Optionally, the two-side driving part includes a rotating motor, a driving gear, a bidirectional threaded rod and a driven gear; the rotating motor is installed on the trolley, and the driving gear is coaxially installed on the output shaft of the rotating motor; the side sealing part includes arc-shaped side plates arranged on both sides of the arc-shaped top plate, and threaded sleeves are arranged on both of the two arc-shaped side plates; the bidirectional threaded rod is horizontally and rotatably connected to the end of the trolley, and the threaded sleeves on the two arc-shaped side plates are respectively threadedly connected to two rod segments of the bidirectional threaded rod with opposite thread directions; the driven gear is coaxially arranged in the middle of the bidirectional threaded rod, and the driving gear meshes with the driven gear; the radian of the arc-shaped side plate is the same as the radian of the arc-shaped space. When the arc-shaped side plate and the arc-shaped top plate both abut against the inner wall surface of the tunnel, the end of the arc-shaped space is completely blocked.

[0021] By adopting the above technical solution, start the rotating motor, so that the output shaft of the rotating motor drives the driving gear to rotate, and then make the driven gear rotate. After the driven gear rotates, it will drive the bidirectional threaded rod to rotate; and the threaded sleeve threadedly matched with the bidirectional threaded rod will move along the length direction of the bidirectional threaded rod when the bidirectional threaded rod rotates, that is, make the two arc-shaped side plates approach or move away from each other on the bidirectional threaded rod; when moving away from each other, the two arc-shaped side plates will finally fit against the inner wall surface of the tunnel. When the two arc-shaped side plates and an arc-shaped top plate all fit against the inner wall surface of the tunnel, the end opening of the entire arc-shaped space is blocked, achieving the effect of being more convenient for automatic blocking.

[0022] Optionally, a guide rail is further arranged on the trolley. The length direction of the guide rail is the same as the length direction of the bidirectional threaded rod. A guide wheel is arranged at the edge of the arc-shaped side plate away from the inner wall surface of the tunnel, and the guide wheel is in rolling cooperation with the guide rail.

[0023] By adopting the above technical solution, the arrangement of the guide rail and the guide wheel can not only play a role in bearing the arc-shaped side plate, but also play a role in stably guiding the movement of the arc-shaped side plate in the horizontal direction.

[0024] Optionally, a first sealing rubber strip is provided on one side of the arc-shaped side plate close to the inner wall surface of the tunnel, and a second sealing rubber strip is provided at one end of the arc-shaped side plate close to the arc-shaped top plate. An automatic abutting assembly is arranged inside the arc-shaped side plate. When the first sealing rubber strip abuts tightly against the inner wall surface of the tunnel, the automatic abutting assembly automatically abuts the second sealing rubber strip tightly between the arc-shaped side plate and the arc-shaped top plate.

[0025] By adopting the above technical solution, after the arc-shaped side plate abuts against the inner wall surface of the tunnel, the first sealing rubber strip will first contact the inner wall surface of the tunnel, blocking the gap between the arc-shaped side plate and the inner wall surface of the tunnel and improving the sealing performance; and the automatic abutting assembly will be activated after the first sealing rubber strip abuts against the inner wall surface of the tunnel, so that the second sealing rubber strip abuts tightly in the gap between the arc-shaped side plate and the arc-shaped top plate, blocking the gap between the arc-shaped side plate and the arc-shaped top plate and improving the sealing effect of the arc-shaped space port plugging.

[0026] Optionally, the automatic abutting assembly includes a first abutting rod, a second abutting rod, a first spring and a second spring; a first sliding cavity is horizontally formed on the arc-shaped side plate, the first abutting rod is slidably inserted into the first sliding cavity, a receiving cavity is formed on one side of the first sealing rubber strip close to the arc-shaped side plate, one end of the first abutting rod is located in the receiving cavity, the first spring is sleeved on the first abutting rod and located in the first sliding cavity, and the first spring always has a tendency to push one end of the first abutting rod into the receiving cavity;

[0027] A second sliding cavity is vertically formed on the arc-shaped side plate, the second sliding cavity is communicated with the first sliding cavity, the second abutting rod is slidably inserted into the second sliding cavity, and the lower end of the second abutting rod is located in the first sliding cavity. A placement groove is formed at the end of the arc-shaped side plate close to the arc-shaped top plate, the second sealing rubber strip is placed in the placement groove, one end of the second abutting rod away from the first sliding cavity extends into the placement groove, and a pushing plate is arranged at one end of the second abutting rod located in the placement groove, and the pushing plate is attached to the second sealing rubber strip; the second spring is sleeved on the second abutting rod and located in the second sliding cavity, and the second spring always has a tendency to push the second abutting rod in the vertically downward direction;

[0028] One end of the first abutting rod located in the first sliding cavity is provided with an inclined pushing surface, one end of the second abutting rod located in the first sliding cavity is provided with a pushed surface corresponding to the inclined pushing surface, and the inclined pushing surface is in sliding fit with the pushed surface.

[0029] By adopting the above technical solution, when the first sealing rubber strip abuts against the inner wall surface of the tunnel, the first sealing rubber strip will be extruded and deformed. At this time, the thickness of the first sealing rubber strip will become smaller, and one end of the first abutting rod will be pushed into the first sliding cavity from the accommodating cavity; when the first abutting rod is extruded and enters the first sliding cavity along the direction, the inclined pushing surface at the end of the first abutting rod will abut against the pushed surface on the second abutting rod. As the first abutting rod continues to move, the inclined pushing surface will push the pushed surface from the first sliding cavity into the second sliding cavity; at this time, the pushing plate at the top of the second abutting rod will push the second rubber strip out of the placement groove and tightly abut against the end wall of the arc-shaped top plate, thereby blocking the gap between the arc-shaped side plate and the arc-shaped top plate, and further achieving the effect of simultaneously and automatically blocking the gaps between the arc-shaped side plate and the inner wall surface of the tunnel and between the arc-shaped side plate and the arc-shaped top plate.

[0030] Optionally, a top sealing strip is covered on the upper arc edge of the arc-shaped top plate.

[0031] By adopting the above technical solution, the setting of the top sealing strip can also block the gap between the arc-shaped top plate and the inner wall surface of the tunnel after the arc-shaped top plate abuts against the inner wall surface of the tunnel, improving the sealing effect of the arc-shaped space port.

[0032] Optionally, a driving box is provided on the trolley, and the driving box is used to block the meshing part of the driving gear and the driven gear.

[0033] By adopting the above technical solution, the driving box can block the meshing part of the driving gear and the driven gear, avoiding the influence of external factors on the normal meshing of the driving gear and the driven gear.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. After the arc-shaped template on the top of the trolley is aligned with the inner wall surface of the tunnel to form an arc-shaped space, only the blocking device is needed to block the openings at both ends of the arc-shaped space, and there is no need to manually block the openings at both ends of the arc-shaped space with wooden boards by workers, thus greatly reducing the labor intensity of workers, and the blocking is also very easy; by using the blocking device to block the openings at both ends of the arc-shaped space, after pouring is completed, it can also be quickly moved inward to continue pouring, which is very convenient;

[0036] 2. Start the rotating motor so that the output shaft of the rotating motor drives the driving gear to rotate, and then drives the driven gear to rotate. After the driven gear rotates, it will drive the bidirectional threaded rod to rotate; and the threaded sleeve threadedly engaged with the bidirectional threaded rod will move along the length direction of the bidirectional threaded rod when the bidirectional threaded rod rotates, that is, make the two arc-shaped side plates approach or move away from each other on the bidirectional threaded rod; when moving away from each other, the two arc-shaped side plates will finally fit on the inner wall surface of the tunnel. After the two arc-shaped side plates and an arc-shaped top plate all fit on the inner wall surface of the tunnel, the end openings of the entire arc-shaped space are blocked, achieving the effect of convenient automatic blocking.

[0037] 3. When the first sealing rubber strip abuts against the inner wall surface of the tunnel, the first sealing rubber strip will be squeezed and deformed. At this time, the thickness of the first sealing rubber strip will become smaller, and one end of the first abutting rod will be pushed into the first sliding cavity from the accommodating cavity; when the first abutting rod is squeezed and enters the first sliding cavity, the inclined pushing surface at the end of the first abutting rod will abut against the pushed surface on the second abutting rod. As the first abutting rod continues to move, the inclined pushing surface will push the pushed surface from the first sliding cavity into the second sliding cavity; at this time, the pushing plate at the top of the second abutting rod will push the second rubber strip out of the placement groove and tightly abut against the end wall of the arc-shaped top plate, thereby blocking the gap between the arc-shaped side plate and the arc-shaped top plate, and then achieving the effect of simultaneously and automatically blocking the gap between the arc-shaped side plate and the inner wall surface of the tunnel and the gap between the arc-shaped side plate and the arc-shaped top plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of an embodiment of the present application.

[0039] Figure 2 is a partial schematic diagram of an embodiment of the present application.

[0040] Figure 3 is a front sectional view showing the plugging device of an embodiment of the present application.

[0041] Figure 4 is Figure 3 the enlarged view of part A in

[0042] Description of reference numerals: 1, trolley; 11, drive box; 2, arc template; 3, plugging device; 4, plugging assembly; 41, side plugging part; 411, arc side plate; 4111, first sealing rubber strip; 41111, accommodation cavity; 4112, second sealing rubber strip; 4113, first sliding cavity; 4114, second sliding cavity; 4115, placement groove; 42, top plugging part; 421, arc top plate; 4211, top sealing strip; 5, drive assembly; 51, top drive part; 511, jack; 512, connecting rod; 52, both sides drive part; 521, rotating motor; 522, driving gear; 523, bidirectional threaded rod; 524, driven gear; 6, threaded sleeve; 7, guide rail; 8, guide wheel; 9, automatic abutting assembly; 91, first abutting rod; 911, inclined pushing surface; 92, second abutting rod; 921, pushed surface; 93, first spring; 94, second spring; 10, pushing plate. Detailed implementation manners

[0043] The following further elaborates on this application Figures 1-4 in conjunction with the attached drawings.

[0044] The embodiment of this application discloses a construction method for integral cast-in-place secondary lining of super-large-section tunnels, including the following steps: Prefabrication step: Correspondingly fabricate the arc template 2 on the top of the trolley 1 according to the size of the tunnel section, so that the arc template 2 matches the tunnel section;

[0045] Positioning and reinforcement step: Drive the trolley 1 into the tunnel, align the arc template 2 with the top wall of the tunnel to form an arc space, and install a steel bar framework in the arc space;

[0046] End face sealing step: Arrange a plugging device 3 at both ends of the arc template 2 on the trolley 1, and automatically plug the two openings at both ends of the arc space through the plugging device 3. Apply a release agent to the side of the arc template 2 and the plugging device 3 close to the arc space before plugging;

[0047] Pouring step: Open the pouring port of the arc template 2, and then pour concrete into the arc space;

[0048] Form removal step: After the concrete solidifies, remove the plugging device 3, continue to drive the trolley 1 inward, and repeat the previous steps.

[0049] Combined with Figure 1 , 2, in the above steps, the plugging device 3 includes a plugging component 4 and a driving component 5. The driving component 5 is installed at the end of the trolley 1. In this embodiment, the end of the trolley 1 refers to the front and rear ends of the trolley 1 along the moving direction of the tunnel; the plugging component 4 is installed on the driving component 5, and the driving component 5 is used to drive the plugging component 4 to move, and the plugging component 4 is used to seal and cover the end opening of the arc-shaped space after moving. After the plugging component 4 blocks the openings at both ends of the arc-shaped space, it is not easy to leak when pouring concrete into the arc-shaped space.

[0050] Combined with Figure 1 , 2 , the plugging component 4 includes a side plugging part 41 and a top plugging part 42, and the driving component 5 includes a top driving part 51 and two side driving parts 52; the top driving part 51 is used to drive the top plugging part 42 to move in the vertical direction, and the two side driving parts 52 are used to drive the two side plugging parts 41 to approach or move away from each other, and the two side plugging parts 41 and a top plugging part 42 block the end opening of the arc-shaped space. First, the top driving part 51 moves the top plugging part 42 vertically upward to the end opening of the arc-shaped space to partially block the end opening of the arc-shaped space; then, the two side driving parts 52 simultaneously drive the two side plugging parts 41 to move away from each other, and make the two side plugging parts 41 both move to the position where they cover the end opening of the arc-shaped space; after the movement of the two side plugging parts 41 and a top plugging part 42, the entire arc-shaped space will be completely blocked, thus achieving the effect of conveniently plugging the end opening of the arc-shaped space.

[0051] As Figure 1 , 2 shown, the top driving part 51 includes a jack 511 and a connecting rod 512. The jack 511 is installed at the end of the trolley 1, and the piston rod of the jack 511 extends vertically upward; the connecting rod 512 is coaxially arranged on the piston rod of the jack 511; the top plugging part 42 includes an arc-shaped top plate 421, and the end of the connecting rod 512 away from the jack 511 is connected to the arc-shaped top plate 421, and the radian of the arc-shaped top plate 421 is the same as the cross-sectional radian of the arc-shaped space. And it is worth noting that a sealing strip is also laid on the side surface of the arc-shaped formwork 2. During the vertical upward movement of the arc-shaped top plate 421, the sealing strip will be squeezed, so that the gap between the arc-shaped top plate 421 and the side surface of the arc-shaped formwork 2 is blocked and it is not easy to leak. Moreover, a top sealing strip 4211 is covered on the upper arc edge of the arc-shaped top plate 421, and the setting of the top sealing strip 4211 can also block the gap between the arc-shaped top plate 421 and the inner wall surface of the tunnel after the arc-shaped top plate 421 abuts against the inner wall surface of the tunnel, improving the sealing effect of the arc-shaped space port.

[0052] Start the jack 511, so that the piston rod of the jack 511 extends vertically upward, thereby pushing the connecting rod 512 to extend vertically upward and move against the arc-shaped top plate 421, and then making the arc-shaped top plate 421 gradually approach the end opening of the arc-shaped space, achieving the effect of making it more convenient and intuitive to drive the arc-shaped top plate 421 to move.

[0053] Combined with Figure 1 and 2 , the two-side driving parts 52 include a rotating motor 521, a driving gear 522, a bidirectional threaded rod 523 and a driven gear 524; the rotating motor 521 is installed on the trolley 1, and the driving gear 522 is coaxially installed on the output shaft of the rotating motor 521; the side sealing parts 41 include arc-shaped side plates 411 arranged on both sides of the arc-shaped top plate 421, and threaded sleeves 6 are arranged on both arc-shaped side plates 411; the bidirectional threaded rod 523 is horizontally and rotatably connected to the end of the trolley 1; the threaded sleeves 6 on the two arc-shaped side plates 411 are respectively threadedly connected to the rod segments of the two opposite thread pitches of the bidirectional threaded rod 523; the driven gear 524 is coaxially arranged in the middle of the bidirectional threaded rod 523, and the driving gear 522 meshes with the driven gear 524; the radian of the arc-shaped side plate 411 is the same as the radian of the arc-shaped space. When both the arc-shaped side plate 411 and the arc-shaped top plate 421 are in contact with the inner wall surface of the tunnel, the end of the arc-shaped space is completely blocked. It should be noted that when the arc-shaped side plate 411 moves to the side of the arc-shaped template 2, it will also squeeze the sealing strip on the side of the arc-shaped template 2, so that the gap between the arc-shaped side plate 411 and the arc-shaped template 2 is blocked. Moreover, a guide rail 7 is also arranged on the trolley 1, the length direction of the guide rail 7 is the same as the length direction of the bidirectional threaded rod 523, and a guide wheel 8 is arranged at the edge of the arc-shaped side plate 411 away from the inner wall surface of the tunnel, and the guide wheel 8 is in rolling cooperation with the guide rail 7.

[0054] Start the rotating motor 521, so that the output shaft of the rotating motor 521 drives the driving gear 522 to rotate, and then makes the driven gear 524 rotate. After the driven gear 524 rotates, it will drive the bidirectional threaded rod 523 to rotate; and the threaded sleeve 6 threadedly engaged with the bidirectional threaded rod 523 will move along the length direction of the bidirectional threaded rod 523 when the bidirectional threaded rod 523 rotates, that is, make the two arc-shaped side plates 411 approach or move away from each other on the bidirectional threaded rod 523; when moving away from each other, the two arc-shaped side plates 411 will finally fit on the inner wall surface of the tunnel. After the two arc-shaped side plates 411 and an arc-shaped top plate 421 are all in contact with the inner wall surface of the tunnel, the end opening of the entire arc-shaped space is blocked, achieving the effect of convenient automatic blocking. The setting of the guide rail 7 and the guide wheel 8 can not only bear the weight of the arc-shaped side plate 411, but also play a role in stably guiding the movement of the arc-shaped side plate 411 in the horizontal direction.

[0055] Combined withFigure 2 , 3 , in this embodiment, after the two arc-shaped side plates 411 and the one arc-shaped top plate 421 are all in place, the end opening of the arc-shaped space can be completely blocked, and a part of the plate surfaces of the arc-shaped side plates 411 and the arc-shaped top plate 421 are in extrusion fit with the sealing strips on the side surface of the arc-shaped template 2. Moreover, a drive box 11 is provided on the trolley 1, and the drive box 11 is used to shield the meshing part of the driving gear 522 and the driven gear 524; and the bidirectional threaded rod 523 is rotatably arranged on the drive box 11, that is, the bidirectional threaded rod 523 passes through the drive box 11. That is, the drive box 11 can shield the meshing part of the driving gear 522 and the driven gear 524 to prevent external factors from affecting the normal meshing of the driving gear 522 and the driven gear 524.

[0056] Combined with Figure 3 , 4 , a first sealing rubber strip 4111 is provided on one side of the arc-shaped side plate 411 close to the inner wall surface of the tunnel, a second sealing rubber strip 4112 is provided at one end of the arc-shaped side plate 411 close to the arc-shaped top plate 421, and an automatic abutting component 9 is arranged inside the arc-shaped side plate 411. When the first sealing rubber strip 4111 abuts tightly against the inner wall surface of the tunnel, the automatic abutting component 9 automatically abuts the second sealing rubber strip 4112 tightly between the arc-shaped side plate 411 and the arc-shaped top plate 421.

[0057] Specifically, combined with Figure 3 , 4, the automatic abutting component 9 includes a first abutting rod 91, a second abutting rod 92, a first spring 93 and a second spring 94; a first sliding cavity 4113 is horizontally formed on the arc-shaped side plate 411, the first abutting rod 91 is slidably inserted into the first sliding cavity 4113, a receiving cavity 41111 is formed on the side of the first sealing rubber strip 4111 close to the arc-shaped side plate 411, one end of the first abutting rod 91 is located in the receiving cavity 41111, the first spring 93 is sleeved on the first abutting rod 91 and is located in the first sliding cavity 4113, a first sliding cavity is communicated and formed in the first sliding cavity 4113, a sliding plate is arranged on the rod section of the first abutting rod 91 located in the first sliding cavity, one end of the first spring 93 abuts against the sliding plate, and the other end abuts against the inner wall of the first sliding cavity, the first spring 93 always has a tendency to push one end of the first abutting rod 91 into the receiving cavity 41111; a second sliding cavity 4114 is vertically formed on the arc-shaped side plate 411, the second sliding cavity 4114 is communicated with the first sliding cavity 4113, the second abutting rod 92 is slidably inserted into the second sliding cavity 4114, and the lower end of the second abutting rod 92 is located in the first sliding cavity 4113, a placing groove 4115 is formed at the end of the arc-shaped side plate 411 close to the arc-shaped top plate 421, the second sealing rubber strip 4112 is placed in the placing groove 4115, one end of the second abutting rod 92 far from the first sliding cavity 4113 extends into the placing groove 4115, and a pushing plate 10 is arranged at one end of the second abutting rod 92 located in the placing groove 4115, the pushing plate 10 is attached to the second sealing rubber strip 4112; the second spring 94 is sleeved on the second abutting rod 92 and is located in the second sliding cavity 4114, the setting of the second spring 94 is similar to the setting of the first spring 93 in the first sliding cavity 4113, the second spring 94 always has a tendency to push the second abutting rod 92 in the vertically downward direction; one end of the first abutting rod 91 located in the first sliding cavity 4113 is provided with an inclined pushing surface 911, one end of the second abutting rod 92 located in the first sliding cavity 4113 is provided with a pushed surface 921 corresponding to the inclined pushing surface 911, and the inclined pushing surface 911 is in sliding fit with the pushed surface 921.

[0058] When the first sealing rubber strip 4111 abuts against the inner wall surface of the tunnel, the first sealing rubber strip 4111 will be squeezed and deformed. At this time, the thickness of the first sealing rubber strip 4111 will become smaller, and one end of the first abutting rod 91 will be pushed into the first sliding cavity 4113 from the accommodation cavity 41111; when the first abutting rod 91 is squeezed and enters the first sliding cavity 4113, the inclined pushing surface 911 at the end of the first abutting rod 91 will abut against the pushed surface 921 on the second abutting rod 92. As the first abutting rod 91 continues to move, the inclined pushing surface 911 will push the pushed surface 921 from the first sliding cavity 4113 into the second sliding cavity 4114; at this time, the pushing plate 10 at the top of the second abutting rod 92 will push the second rubber strip out of the placement groove 4115 and tightly abut against the end wall of the arc-shaped top plate 421, thereby blocking the gap between the arc-shaped side plate 411 and the arc-shaped top plate 421, and further achieving the effect of simultaneously and automatically blocking the gaps between the arc-shaped side plate 411 and the inner wall surface of the tunnel and between the arc-shaped side plate 411 and the arc-shaped top plate 421.

[0059] The implementation principle of the integral cast-in-place construction method for the secondary lining of an extra-large cross-section tunnel in an embodiment of the present application is as follows: First, move the trolley 1 below the inner wall surface of the tunnel so that the arc-shaped template 2 faces the inner wall surface of the tunnel. Then, start the jack 511 to vertically lift the arc-shaped top plate 421 coated with a release agent and fit it against the inner wall surface of the tunnel; then start the rotation motor 521 to rotate the bidirectional threaded rod 523, so that the two arc-shaped side plates 411 coated with a release agent move away from each other and abut against the inner wall surface of the tunnel at the same time. When the two arc-shaped side plates 411 and one arc-shaped top plate 421 all abut against the inner wall surface of the tunnel, the two arc-shaped side plates 411 and one arc-shaped top plate 421 will completely block the end opening of the arc-shaped space. At this time, the concrete in the arc-shaped space can be poured; after the pouring solidifies, move the arc-shaped side plates 411 and the arc-shaped top plate 421 back to a position where they do not block the end opening of the arc-shaped space, and continue to drive the trolley 1 into the tunnel to continue pouring the next part of the inner wall surface of the tunnel.

[0060] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A construction method for integral cast-in-place secondary lining of a super-large cross-section tunnel, characterized in that: It includes the following steps: Prefabrication step: According to the size of the tunnel cross-section, correspondingly fabricate the arc-shaped formwork (2) at the top of the corresponding trolley (1), so that the arc-shaped formwork (2) matches the tunnel cross-section; Positioning and reinforcement step: Drive the trolley (1) into the tunnel, align the arc-shaped formwork (2) with the tunnel top wall to form an arc-shaped space, and install a steel bar frame in the arc-shaped space; End face sealing step: Set a sealing device (3) at both ends of the arc-shaped formwork (2) on the trolley (1), and automatically seal the two openings at the ends of the arc-shaped space through the sealing device (3). Before sealing, apply a release agent to the side of the arc-shaped formwork (2) and the sealing device (3) close to the arc-shaped space; Pouring step: Open the pouring port of the arc-shaped formwork (2), and then pour concrete into the arc-shaped space; Formwork removal step: After the concrete solidifies, remove the sealing device (3), and continue to drive the trolley (1) inward, and repeat the previous steps; The sealing device (3) includes a sealing component (4) and a driving component (5). The driving component (5) is installed at the end of the trolley (1), and the sealing component (4) is installed on the driving component (5); the driving component (5) is used to drive the sealing component (4) to move, and the sealing component (4) is used to hermetically cover the opening at the end of the arc-shaped space after moving; The sealing component (4) includes a side sealing part (41) and a top sealing part (42), and the driving component (5) includes a top driving part (51) and two side driving parts (52); the top driving part (51) is used to drive the top sealing part (42) to move in the vertical direction, and the two side driving parts (52) are used to drive the two side sealing parts (41) to approach or move away from each other. The two side sealing parts (41) and one top sealing part (42) block the opening at the end of the arc-shaped space; The top driving part (51) includes a jack (511) and a connecting rod (512). The jack (511) is installed at the end of the trolley (1), and the piston rod of the jack (511) extends vertically upward; the connecting rod (512) is coaxially arranged on the piston rod of the jack (511); the top sealing part (42) includes an arc-shaped top plate (421), and the end of the connecting rod (512) away from the jack (511) is connected to the arc-shaped top plate (421), and the radian of the arc-shaped top plate (421) is the same as the cross-section radian of the arc-shaped space; The two-side driving parts (52) include a rotating motor (521), a driving gear (522), a bidirectional threaded rod (523) and a driven gear (524); the rotating motor (521) is installed on the trolley (1), and the driving gear (522) is coaxially installed on the output shaft of the rotating motor (521); the side sealing parts (41) include arc-shaped side plates (411) arranged on both sides of the arc-shaped top plate (421), and threaded sleeves (6) are arranged on both of the two arc-shaped side plates (411); the bidirectional threaded rod (523) is horizontally and rotatably connected to the end of the trolley (1), and the threaded sleeves (6) on the two arc-shaped side plates (411) are respectively threadedly connected to two rod segments of the bidirectional threaded rod (523) with opposite thread directions; the driven gear (524) is coaxially arranged in the middle of the bidirectional threaded rod (523), and the driving gear (522) meshes with the driven gear (524); the radian of the arc-shaped side plate (411) is the same as the radian of the arc-shaped space. When the arc-shaped side plate (411) and the arc-shaped top plate (421) are both in contact with the inner wall surface of the tunnel, the end of the arc-shaped space is completely blocked; A first sealing rubber strip (4111) is arranged on one side of the arc-shaped side plate (411) close to the inner wall surface of the tunnel, and a second sealing rubber strip (4112) is arranged at one end of the arc-shaped side plate (411) close to the arc-shaped top plate (421). An automatic abutting assembly (9) is arranged inside the arc-shaped side plate (411). When the first sealing rubber strip (4111) abuts tightly against the inner wall surface of the tunnel, the automatic abutting assembly (9) automatically abuts the second sealing rubber strip (4112) tightly between the arc-shaped side plate (411) and the arc-shaped top plate (421); The automatic abutting assembly (9) includes a first abutting rod (91), a second abutting rod (92), a first spring (93) and a second spring (94); a first sliding cavity (4113) is horizontally formed on the arc-shaped side plate (411), the first abutting rod (91) is slidably inserted into the first sliding cavity (4113), a receiving cavity (41111) is formed on one side of the first sealing rubber strip (4111) close to the arc-shaped side plate (411), one end of the first abutting rod (91) is located inside the receiving cavity (41111), the first spring (93) is sleeved on the first abutting rod (91) and is located inside the first sliding cavity (4113), and the first spring (93) always has a tendency to push one end of the first abutting rod (91) into the receiving cavity (41111); A second sliding cavity (4114) is vertically formed in the arc-shaped side plate (411). The second sliding cavity (4114) communicates with the first sliding cavity (4113). The second abutting rod (92) is slidably inserted into the second sliding cavity (4114), and the lower end of the second abutting rod (92) is located in the first sliding cavity (4113). An accommodating groove (4115) is formed at the end of the arc-shaped side plate (411) close to the arc-shaped top plate (421). The second sealing rubber strip (4112) is placed in the accommodating groove (4115). One end of the second abutting rod (92) away from the first sliding cavity (4113) extends into the accommodating groove (4115), and a pushing plate (10) is arranged at the end of the second abutting rod (92) located in the accommodating groove (4115). The pushing plate (10) is in contact with the second sealing rubber strip (4112). The second spring (94) is sleeved on the second abutting rod (92) and is located in the second sliding cavity (4114). The second spring (94) always has a tendency to push the second abutting rod (92) in the vertically downward direction. One end of the first abutting rod (91) located in the first sliding cavity (4113) is provided with an inclined pushing surface (911). One end of the second abutting rod (92) located in the first sliding cavity (4113) is provided with a pushed surface (921) corresponding to the inclined pushing surface (911). The inclined pushing surface (911) is in sliding fit with the pushed surface (921).

2. The integral cast-in-place construction method for the secondary lining of an extra-large cross-section tunnel according to claim 1, characterized in that: A guiding rail (7) is further arranged on the trolley (1). The length direction of the guiding rail (7) is the same as that of the bidirectional threaded rod (523). A guiding wheel (8) is arranged at the edge of the arc-shaped side plate (411) away from the tunnel inner wall surface. The guiding wheel (8) is in rolling fit with the guiding rail (7).

3. The integral cast-in-place construction method for the secondary lining of an extra-large cross-section tunnel according to claim 1, characterized in that: A top sealing strip (4211) is covered on the upper arc edge of the arc-shaped top plate (421).

4. The integral cast-in-place construction method for the secondary lining of an extra-large cross-section tunnel according to claim 1, characterized in that: A driving box (11) is arranged on the trolley (1). The driving box (11) is used to shield the meshing part of the driving gear (522) and the driven gear (524).

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