Cast lining splicing device, tunnel lining trolley and tunnel construction method

Abstract

The present invention provides a cast lining overlap device, a tunnel lining trolley, and a tunnel construction method. The cast lining overlap device includes a top support panel, a first overlap extension, a first deformable member, a second overlap extension, a second deformable member, and a limiter. The top support panel, the first overlap extension, the second overlap extension, and the limiter are arranged in sequence along the longitudinal direction. The first deformable member is arranged on the first overlap extension, and the second deformable member is arranged on the second overlap extension. The second deformable member protrudes from the first deformable member and has a greater elastic deformation capacity than the first deformable member. The tunnel lining trolley includes a main frame and a cast lining overlap device connected to the main frame. The tunnel construction method includes obtaining pressure detection data of the first deformable member through a pressure sensing device; when the pressure detection data reaches a preset value, the cast lining overlap device stops extending. The present invention effectively ensures the quality of the lining section and the quality of the lining section overlap construction joint.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, in particular to a cast lining overlap device, a tunnel lining trolley and a tunnel construction method. Background Art

[0002] When pouring the secondary lining layer during tunnel construction, the existing construction technology uses a secondary lining trolley for cast-in-place concrete. The lining trolley is a rigid structure as a whole. When pouring the lining layer in sections along the longitudinal direction of the tunnel, the trolley is pushed into place to position and support the template of the section to be poured, which involves the overlap operation of one side panel and the end of the poured lining section.

[0003] The existing lining trolley end overlap methods mainly include rigid overlap and flexible overlap.

[0004] like Figure 1 As shown, the first and second lining sections 91 that have been cast are located in the first area 901 of the lining position 900, and the second area 902 is the area where the second and second lining sections are to be cast. When the rigid overlap method is adopted, the top support panel 81 of the trolley directly contacts the ends of the first and second lining sections 91 that have been cast. The ends are the weak points on the first and second lining sections 91. Under the pressure of rigid overlap, the ends of the first and second lining sections 91 will often cause concrete cracks to occur, burying a major hidden danger to the quality and safety of the construction joint at this location. In addition, due to the deviation in the movement and positioning of the lining trolley, the rigid overlap method can easily cause the top support panel 81 to overlap the ends of the first and second lining sections 91 loosely, resulting in leakage during the concrete pouring process in the second area 902, and further leading to quality defects at the construction joint.

[0005] like Figure 2 As shown, the top support panel 82 includes a first plate 821 extending in the longitudinal direction of the tunnel (the x-axis direction in the figure) and a second plate 822 bent and extending from the first plate 821 away from the lining position 900. An extension member 83 is fixed to the second plate 822 and extends the top support panel 82 longitudinally. A flexible rubber member 84 is fixed to the extension member 83 on a side close to the lining position 900, and the flexible rubber member 84 protrudes from the surface 820 of the first plate 821 facing the lining position 900. In the flexible overlap mode, the flexible rubber member 84 contacts the ends of the first and second lining sections 91, thereby avoiding hard contact and solving the problems of concrete cracking and loose overlap. However, as shown in FIG. Figure 3 and Figure 4As shown, when there are deviations in the movement and positioning of the lining trolley, the flexible rubber member 84 is not completely facing the first and second lining sections 91. In this state, after the support, the first plate 821 and a part of the flexible rubber member 84 pass over the base surface 90 and enter the second area 902. After the concrete is poured in the second area 902 and demolded, a depression 921 appears on the surface of the pouring section and an irregular pit 922 is formed at the construction joint, causing quality problems with defects at the construction joint. Summary of the Invention

[0006] The first object of the present invention is to provide a cast lining overlap device which ensures the quality of the lining section and the quality of the lining section overlap construction joint.

[0007] The second object of the present invention is to provide a tunnel lining trolley that ensures the quality of the lining section and the quality of the lap joint construction joint of the lining section.

[0008] The third object of the present invention is to provide a tunnel construction method that ensures the quality of the lining section and the quality of the lap joints of the lining section.

[0009] The first object of the present invention is to provide a cast lining overlap device for a tunnel lining trolley, wherein one side of the cast lining overlap device faces the lining position, and the cast lining overlap device includes a top support panel, a first overlap extension, a first deformable member, a second overlap extension, and a second deformable member. The top support panel includes a first plate body and a second plate body, the first plate body extends in the longitudinal direction of the tunnel, the surface side of the first plate body is a mating surface facing the lining position, and the second plate body is bent and extended from the extended end of the first plate body along the second direction and away from the lining position, and the second direction is perpendicular to the longitudinal direction; the first overlap extension is connected to the second plate body, and in the second direction, the first overlap A first mounting position is formed on a side of the extension piece close to the mating surface; the first deformable piece is arranged at the first mounting position; the second overlap extension piece is connected to the first overlap extension piece, and the top support panel, the first overlap extension piece and the second overlap extension piece are arranged in sequence along the longitudinal direction; in the second direction, a second mounting position is formed on a side of the second overlap extension piece close to the mating surface, the second deformable piece is arranged at the second mounting position, and the mating surface, the first deformable piece and the second deformable piece are arranged adjacent to each other in sequence along the longitudinal direction; the elastic deformation capacity of the second deformable piece is greater than that of the first deformable piece, and the second deformable piece protrudes from the mating surface and is close to the lining position relative to the mating surface.

[0010] It can be seen from the above scheme that the present invention sets two deformable parts with different hardness to cooperate and contact with the end of the lining section that has been cast, wherein, in the longitudinal direction, the second deformable part with lower hardness is closer to the first and second lining sections that have been cast, and the first deformable part with higher hardness corresponds to the end of the first and second lining sections that have been cast and the construction joint. When the top support panel is positioned and supported, the flexible second deformable part abuts the first and second lining sections that have been cast, ensuring a tight fit but no extrusion. The harder first deformable part undergoes a small amount of deformation and will not be squeezed into the second area. At the same time, the first plate body will not enter the second area. Therefore, after the concrete of the second area is poured and demolded, no concave position will be formed at the bottom of the second and second lining sections that have been cast, and no pit will be formed at the construction joint between the two casting sections, thereby effectively improving the quality of the lining and the lining construction joint.

[0011] A further solution is that in the longitudinal direction, the size of the first deformable member is larger than the size of the second deformable member; in the second direction, the size of the second deformable member is larger than the size of the first deformable member.

[0012] As can be seen from the above, since the second deformable member is used to ensure the sealing between the overlapping device and the first and second lining sections that have been cast, the second deformable member has a larger height to increase the deformation amount and ensure the matching force between the first and second lining sections; and the first deformable member is harder and has a larger size in the longitudinal direction, so that the first deformable member can span the first and second lining sections and the construction joint in the longitudinal direction, thereby ensuring the integrity of the two lining sections and the construction joint contours.

[0013] A further solution is that the first deformable member protrudes from the mating surface and is close to the lining position relative to the mating surface.

[0014] As can be seen from the above, since the first deformable member will produce a certain deformation during the support, the slightly raised first deformable member is roughly flush with the first plate after deformation. This arrangement can ensure that the surfaces of two continuous lining sections are as continuous as possible.

[0015] A further solution is that the second deformable member protrudes from the first deformable member and is closer to the lining position relative to the first deformable member.

[0016] As can be seen from the above, since the deformation capacity of the second deformable member is greater than that of the first deformable member, and the second deformable member is used to ensure the sealing between the overlapping device and the first and second lining sections that have been cast, therefore, when the second deformable member protrudes from the first deformable member, the positioning support can ensure that the second deformable member is fully deformed and fits more fully with the surface of the first and second lining sections that have been cast.

[0017] A further solution is that the first overlapping extension member has a first end surface facing the first deformable member, the second overlapping extension member has a second end surface facing the second deformable member, and the second end surface is farther away from the lining position than the first end surface.

[0018] As can be seen from the above, under this setting, the second mounting position has a deeper depth to accommodate a higher second deformable member, so the second deformable member has a better deformation effect, and a flexible material with greater deformation capacity can be selected to further avoid squeezing the concrete while ensuring contact sealing.

[0019] A further solution is that, in the longitudinal direction, the first overlapping extension has first side walls located on opposite sides of itself and a first internal space located between the two first side walls, and the second overlapping extension has second side walls located on opposite sides of itself and a second internal space located between the two second side walls; one first side wall is connected to the second plate body by a first bolt along the longitudinal direction, and the other first side wall is connected to a second side wall by a second bolt along the longitudinal direction.

[0020] As can be seen from the above solution, the formation of the first internal space and the second internal space facilitates the entry of bolts and screw installation, reduces the difficulty of installation, and ensures a more stable connection between multiple components.

[0021] A further solution is that the first deformable member and the second deformable member are both made of rubber material.

[0022] A further solution is that the cast lining overlap device further includes a pressure sensing device, the pressure sensing device is arranged in the first overlap extension member, and the sensing end of the pressure sensing device is connected to the first deformation member.

[0023] As can be seen from the above, when positioning and supporting the panel, the pressure sensing device can also be used to constantly detect the extrusion pressure of the first deformable member at this time, thereby effectively preventing excessive extrusion pressure from affecting the first and second lining sections.

[0024] The second purpose of the present invention provides a tunnel lining trolley including a main frame and a plurality of cast lining overlap devices telescopically connected to the main frame along the circumferential direction of the tunnel; the cast lining overlap devices adopt the above-mentioned cast lining overlap devices.

[0025] The tunnel construction method provided by the third purpose of the present invention is implemented using the above-mentioned tunnel lining trolley; the cast lining overlap device also includes a pressure sensing device, the pressure sensing device is arranged in the first overlap extension, and the sensing end of the pressure sensing device is connected to the first deformable member; the lining position includes a first area and a second area arranged in sequence along the longitudinal direction; the tunnel construction method includes: completing the casting of the first and second lining sections in the first area; controlling the cast lining overlap device so that the second deformable member and the first deformable member are facing the first and second lining sections, and the mating surface is facing the second area; controlling the cast lining overlap device to extend so that the second deformable member and the first deformable member abut the first and second lining sections, and obtaining pressure detection data through the pressure sensing device; when the pressure detection data reaches a preset value, controlling the cast lining overlap device to stop extending; and completing the casting of the second and second linings in the second area.

[0026] It can be seen from the above scheme that when the cast lining overlap device of the present invention is used for construction, when the panel is positioned and supported, the extrusion pressure of the first deformable member at this time is constantly detected by the pressure sensing device, thereby effectively preventing the first and second lining sections from cracking due to excessive extrusion pressure, thereby effectively protecting the first and second lining sections and ensuring construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the rigid overlap method in the prior art.

[0028] Figure 2 This is a schematic diagram of the first working state of the flexible overlap method in the prior art.

[0029] Figure 3 This is a schematic diagram of the second working state of the flexible overlap method in the prior art.

[0030] Figure 4 This is a schematic diagram of the third working state of the flexible overlap method in the prior art.

[0031] Figure 5 Schematic diagram of the working state of the tunnel lining trolley embodiment of the present invention.

[0032] Figure 6 This is a schematic diagram of a first working state of an embodiment of a cast lining splicing device of a tunnel lining trolley according to the present invention.

[0033] Figure 7 for Figure 6 Enlarged view of point A in the middle.

[0034] Figure 8 This is a schematic diagram of the second working state of an embodiment of the cast lining overlap device of the tunnel lining trolley of the present invention.

[0035] Figure 9 for Figure 8Enlarged view of point B in the middle.

[0036] Figure 10 This is a schematic diagram of the third working state of an embodiment of the cast lining overlap device of the tunnel lining trolley of the present invention.

[0037] Figure 11 for Figure 10 Enlarged view of point C in the middle. DETAILED DESCRIPTION

[0038] Tunnel lining trolley embodiment

[0039] See also Figure 5 and Figure 6 In the coordinate system in the figure, the x-axis direction is the longitudinal direction of the tunnel, the z-axis direction is the height direction and the second direction of the present invention, and the y-axis direction is the transverse direction of the tunnel.

[0040] See also Figure 5 The tunnel lining trolley of the present invention includes a main frame 11 and a plurality of cast lining overlap devices 2 of the present invention that are telescopically connected to the main frame 11 along the circumferential direction of the tunnel. A vertical lifting hydraulic cylinder 121 is provided at the lower portion of the main frame 11, and the main frame 11 and the cast lining overlap devices 2 are connected by a supporting hydraulic cylinder 122. In addition, an operating platform 13 and a ventilation duct 14 are also provided in the middle portion of the main frame 11. Of course, a track wheel set is provided at the bottom of the main frame 11, and a track is provided on the invert filling layer 73 of the tunnel.

[0041] Combine Figure 5 and Figure 6 From the outside to the inside, the tunnel includes an initial support layer 71 and a secondary lining layer 72, and the pouring of the secondary lining layer 72 is along the longitudinal direction of the tunnel ( Figure 6 The casting process is carried out in sections (in the x-axis direction shown). Lining position 900 is the space for casting the secondary lining layer 72. The first area 901 of lining position 900 is the area where the first secondary lining section 91, which has been cast, is located. The second area 902 of lining position 900 is the area where the second secondary lining section to be cast is located. When casting the second secondary lining section, the cast lining overlapping device 2 is required to overlap the cast first secondary lining section 91.

[0042] Recombination Figure 7One side of the cast lining overlap device 2 faces the above-mentioned lining position 900. The cast lining overlap device 2 includes a top support panel 21, a first overlap extension 22, a second overlap extension 23, a limiter 24, a first deforming member 25, a second deforming member 26 and a pressure sensing device 15. Among them, the top support panel 21 includes a first plate body 211 and a second plate body 212. The first plate body 211 is the template of the secondary lining layer. The first plate body 211 extends along the longitudinal direction of the tunnel. The surface side of the first plate body 211 is a mating surface 210 facing the lining position 900 for forming the outline of the secondary lining layer 72. The second plate body 212 is bent from the longitudinal extension end of the first plate body 211 along the negative direction of the z axis and away from the lining position 900, extending from Figure 7 It can be seen that the second plate 212 is perpendicular to the first plate 211 .

[0043] In the longitudinal direction of the tunnel, the first lap extension 22 has first sidewalls 221 on opposite sides of the first lap extension 22 and a first internal space 222 between the two first sidewalls 221. A first sidewall 221 adjacent to the second plate 212 is connected to the second plate 212 via a first bolt 271 running longitudinally. The pressure sensing device 15 is disposed in the first internal space 222. A first end surface 220 is disposed on the side of the first lap extension 22 facing the lining position 900. The portion outside the first end surface 220 forms a first mounting position. The first deformable member 25 is disposed in the first mounting position. The sensing end 151 of the pressure sensing device 15 passes through the end wall of the first lap extension 22 and contacts the first deformable member 25. The pressure sensing device 15 is electrically connected to the processor of the control platform 13.

[0044] In the longitudinal direction of the tunnel, the second overlapping extension 23 has second sidewalls 231 on opposite sides of the second extension 231 and a second interior space 232 between the two second sidewalls 231. One second sidewall 231 adjacent to the first overlapping extension 22 is connected to the other first sidewall 221 of the first overlapping extension 22 by a second bolt 272 running longitudinally. A second end surface 230 is provided on the side of the second overlapping extension 23 facing the lining position 900. Beyond the second end surface 230, a second mounting position is formed, in which the second deformable member 26 is disposed. A stopper 24 is a baffle fixedly connected to the other second sidewall 231 of the second overlapping extension 23.

[0045] At this time, along the longitudinal direction of the tunnel, the top support panel 21, the first overlapping extension 22, the second overlapping extension 23 and the limiting member 24 are arranged in sequence. The first overlapping extension 22 and the limiting member 24 are both closer to the lining position 900 than the second end face 230. Therefore, the first overlapping extension 22 and the limiting member 24 respectively limit the second deformable member 26 located in the second installation position from both longitudinal sides. The top support panel 21 and the second deformable member 26 located in the second installation position are both closer to the lining position 900 than the first end face 220. Therefore, the top support panel 21 and the second deformable member 26 respectively limit the first deformable member 25 located in the first installation position from both longitudinal sides. In addition, Figure 7 It can be seen that in the second direction, the top 241 of the limiting member 24 is farther away from the lining position 900 than the matching surface 210 .

[0046] like Figure 6 and Figure 7 As shown, when the cast lining overlap joint device 2 is in an unstressed state, the first deformable member 25 protrudes from the mating surface 210 of the first plate 211 and is closer to the lining position 900 than the mating surface 210. The first deformable member 25 has a flat upper surface 250. The second deformable member 26 protrudes from the first deformable member 25 and is closer to the lining position 900 than the first deformable member 25. Furthermore, in the longitudinal direction, the second deformable member 26 has a lower portion 262 closer to the first deformable member 25 and a higher portion 261 farther away from the first deformable member. In the second direction, the higher portion 261 is closer to the lining position 900 than the lower portion 262, and the lower portion 262 is closer to the lining position 900 than the upper surface 250. The second deformable member 26 also includes a guide slope 260 extending obliquely in the longitudinal direction between the lower portion 262 and the higher portion 261. The guide slope 260 is also the surface of the second deformable member 26 for contacting the lining segment.

[0047] In this embodiment, the first deformable member 25 and the second deformable member 26 are both made of rubber material, but the elastic deformation capacity of the second deformable member 26 is greater than that of the first deformable member 25, and the second deformable member 26 is softer. Figure 7 It can be seen that in the second direction, the size of the second deformable member 26 is larger than that of the first deformable member 25, but in the longitudinal direction, the size of the first deformable member 25 is larger than that of the second deformable member 26. Specifically, in the longitudinal direction, the size of the first deformable member 25 is greater than 7 cm, and the size of the second deformable member 26 is greater than 3 cm.

[0048] Recombination Figure 8 and Figure 9When the cast lining overlap device 2 is positioned and supported and the positioning is relatively accurate, the supporting panel 21 is facing the second area 902 where the second secondary lining section is to be cast, and the first deforming member 25 and the second deforming member 26 are facing the first secondary lining section 91 that has been cast and is located in the first area 901. At this time, the upper surface 250 of the first deforming member 25 and the guiding inclined surface 260 of the second deforming member 26 abut against the first secondary lining section 91 and generate extrusion deformation until the mating surface 210 is aligned with the surface of the first secondary lining section 91.

[0049] At this time, the extrusion deformation of the first deformable member 25 is smaller, while the extrusion deformation of the second deformable member 26 is larger. Furthermore, when the second deformable member 26 contacts the first and second lining sections 91 and undergoes extrusion deformation, the top of the high portion 261 of the second deformable member 26 is guided obliquely and bent away from the construction joint 903, and is restrained by the top 241 of the stopper 24 for further extrusion. Ultimately, the inclined upper end surface (guide slope 260) of the second deformable member 26 reaches a flat state, and the top of the high portion 261 of the second deformable member 26 is squeezed into the gap 240 between the first and second lining sections 91 and the top 241 of the stopper 24. This not only ensures sufficient contact surface between the second deformable member 26 and the first and second lining sections 91, but also increases the degree of extrusion between the two, thereby better ensuring sealing. Of course, because the second deformable member 26 is relatively soft, it does not cause hard contact with the first and second lining sections 91, thereby preventing concrete cracking.

[0050] And as Figure 10 and Figure 11 As shown, when there are deviations in the movement and positioning of the lining trolley, only a small part of the upper surface 250 of the first deformable member 25 faces and abuts the first and second lining sections 91 that have been cast, while the majority faces the second area 902 where the second and second lining sections are to be cast. However, since the first deformable member 25 has a weaker deformation capacity and is harder, Figure 3 and Figure 11 Even if a portion of the first deformable member 25 abuts against the first secondary lining section 91, the other portion of the first deformable member 25 will not be squeezed and bulge into the second area 029 like the flexible rubber member 84 in the prior art, thereby affecting the casting and forming of the second secondary lining section, thereby ensuring the quality of the construction joint.

[0051] Therefore, regardless of whether the lining trolley's movement and positioning are deviated, the cast lining overlap device 2 of the present invention can ensure a flexible overlap with the already cast primary and secondary lining sections 9, ensuring a tight seal and preventing concrete leakage without damaging the concrete. Furthermore, even if the lining trolley's movement and positioning are deviated, no depressions or irregular pits will appear at the construction joint after the concrete is poured and demolded in the second area 902, thereby effectively ensuring the quality of the cast section and the construction joint.

[0052] Tunnel construction method embodiment

[0053] Combine Figures 5 to 9 The tunnel construction method of the present invention is implemented using the tunnel lining trolley of the present invention. The pressure sensing device 15 in each cast lining overlap device 2 is electrically connected to the processor of the control platform 13. The pressure received by the first deformable member 25 can be detected by the pressure sensing device 15 and formed into pressure detection data and transmitted to the control platform 13 for calculation.

[0054] The tunnel construction method primarily involves splicing and casting secondary lining sections. The method includes: first, casting the first secondary lining section 91 in the first region 901. The tunnel lining trolley is then controlled to continue traveling longitudinally along the tunnel until the second deformable member 26 and the first deformable member 25 are oriented toward the already cast first secondary lining section 91, and the mating surface 210 of the top support panel 21 is positioned toward the second region 902 where the second secondary lining section is to be cast.

[0055] The splicing step is then executed, controlling the supporting hydraulic cylinder 122 to extend, thereby positioning and supporting the cast lining splicing device 2. At this point, both the second deformable member and the first deformable member abut against the first secondary lining segment 91. The system then obtains pressure detection data about the first deformable member 25 through the pressure sensing device 15 and determines whether the pressure detection data reaches a preset value. If so, the supporting hydraulic cylinder 122 is controlled to stop, thereby stopping the extension of the cast lining splicing device 2. At this point, a gap 240 is formed between the first secondary lining segment 91 and the stopper 24, and the deformed portion of the second deformable member 26 is located within the gap 240.

[0056] Then, the second secondary lining is poured in the second area 902 .

[0057] Among them, the above-mentioned preset values ​​for comparison with the pressure detection data can be determined after multiple on-site tests in combination with the actual operation of the hydraulic system of the trolley itself.

[0058] When the cast lining overlap device of the present invention is used for construction, when the panel is positioned and supported, the pressure sensing device constantly detects the extrusion pressure of the harder first deformable member 25 at this time, thereby effectively preventing the first and second lining sections 91 from cracking due to excessive extrusion pressure, thereby effectively protecting the first and second lining sections 91, and further ensuring the close fit between the second deformable member 26 and the already cast first and second lining sections 91 under the special contour design, thereby effectively preventing leakage of pouring slurry, thereby ensuring the construction quality.

[0059] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cast lining splicing device for a tunnel lining trolley, wherein one side of the cast lining splicing device faces the lining position, comprising: a top support panel, the top support panel comprising a first plate body and a second plate body, the first plate body extending in the longitudinal direction of the tunnel, the surface side of the first plate body being a mating surface facing the lining position, the second plate body being bent and extended from an extended end portion of the first plate body along a second direction and away from the lining position, the second direction being perpendicular to the longitudinal direction; a first overlapping extension piece, wherein the first overlapping extension piece is connected to the second plate body, and a first mounting position is formed on a side of the first overlapping extension piece close to the mating surface in the second direction; a first deformable member, the first deformable member being arranged at a first installation position; Its characteristics are: The cast lining overlap device further includes a second overlap extension member and a second deforming member; The second overlapping extension piece is connected to the first overlapping extension piece, and the top support panel, the first overlapping extension piece and the second overlapping extension piece are arranged in sequence along the longitudinal direction; In the second direction, a second mounting position is formed on a side of the second overlapping extension member close to the mating surface, the second deformable member is arranged at the second mounting position, and the mating surface, the first deformable member and the second deformable member are arranged adjacent to each other in sequence along the longitudinal direction; The elastic deformation capacity of the second deformable member is greater than that of the first deformable member. The second deformable member protrudes from the matching surface and is close to the lining position relative to the matching surface.

2. The cast lining splicing device of the tunnel lining trolley according to claim 1, characterized in that: In the longitudinal direction, the size of the first deformable member is larger than the size of the second deformable member; In the second direction, a size of the second deformable member is greater than a size of the first deformable member.

3. The cast lining splicing device of the tunnel lining trolley according to claim 2, characterized in that: The first deformable member protrudes from the matching surface and is close to the lining position relative to the matching surface.

4. The cast lining splicing device of the tunnel lining trolley according to claim 3, characterized in that: The second deformable member protrudes from the first deformable member and is closer to the lining position relative to the first deformable member.

5. The cast lining splicing device of the tunnel lining trolley according to claim 2, characterized in that: The first overlapping extension piece has a first end surface facing the first deformable piece, and the second overlapping extension piece has a second end surface facing the second deformable piece. The second end surface is farther away from the lining position than the first end surface.

6. The cast lining splicing device of a tunnel lining trolley according to any one of claims 1 to 5, characterized in that: In the longitudinal direction, the first overlapping extension piece has first side walls located on opposite sides of the first extending piece and a first internal space located between the two first side walls; the second overlapping extension piece has second side walls located on opposite sides of the first extending piece and a second internal space located between the two second side walls; One of the first side walls is connected to the second plate body by a first bolt along the longitudinal direction, and another of the first side walls is connected to one of the second side walls by a second bolt along the longitudinal direction.

7. The cast lining splicing device of a tunnel lining trolley according to any one of claims 1 to 5, characterized in that: The first deformable member and the second deformable member are both made of rubber material.

8. The cast lining splicing device of a tunnel lining trolley according to any one of claims 1 to 5, characterized in that: The cast lining overlap device further includes a pressure sensing device, which is arranged in the first overlap extension member, and a sensing end of the pressure sensing device is connected to the first deformation member.

9. A tunnel lining trolley comprising a main frame and a plurality of cast lining overlap devices telescopically connected to the main frame along the circumferential direction of the tunnel; Its characteristics are: The cast lining overlap device adopts the cast lining overlap device described in any one of claims 1 to 7 above.

10. A tunnel construction method, characterized in that: The method is implemented by using the tunnel lining trolley according to claim 9; The cast lining overlap device further comprises a pressure sensing device, wherein the pressure sensing device is arranged in the first overlap extension member, and a sensing end of the pressure sensing device is connected to the first deformation member; The lining position includes a first area and a second area sequentially arranged along the longitudinal direction; The tunnel construction method comprises: completing the pouring of the first and second lining sections in the first area; controlling the cast lining overlap device so that the second deformable member and the first deformable member face the first secondary lining segment and the mating surface faces the second area; controlling the cast lining overlap device to extend so that the second deformable member and the first deformable member abut against the first secondary lining segment, and obtaining pressure detection data through the pressure sensing device; When the pressure detection data reaches a preset value, the cast lining overlap device is controlled to stop extending; The pouring of the second secondary lining is completed in the second area.

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