Counter-pull type supporting structure for tunneling construction of T-shaped connecting channel in tunnel

Abstract

The utility model discloses a counter-pull type supporting structure for tunneling construction of a T-shaped connecting channel in a tunnel. According to the technical scheme, the size of the outer contour of the axial projection of the counter-pull type supporting structure in the main line tunnel is smaller than the diameter of the main line tunnel, so that a space is reserved between the counter-pull type supporting structure and the main line tunnel, and when the counter-pull type supporting structure is installed, no supporting piece needs to be arranged on the passing side. Therefore, during construction of the super-large-diameter shield tunnel connection channel, the counter-pull type supporting structure not only provides supporting force for tunneling equipment, but also meets the condition of synchronous construction of a main line tunnel or other connection channels, the construction efficiency of forming the T-shaped connection channel in the super-large-diameter shield tunnel is improved, the construction period is shortened, and in addition, the construction cost is reduced. The first reinforcing and supporting assembly is arranged to tension and reinforce the duct pieces in the main disturbance area in the hole cutting and breaking process, slab staggering and opening deformation of main line tunnel duct piece joints in the T-shaped connection channel construction process are effectively limited, and construction safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a reverse-pull support structure used for excavation construction of a T-shaped connecting channel in a tunnel. Background Art

[0002] In urban rail construction, when the connecting length between two single-line tunnels is greater than 600m, a T-type connecting channel needs to be set up to meet fire protection requirements. Among them, when setting up T-type connecting channels for subway tunnels and municipal highway tunnels, the mining method is often used for construction. When dealing with complex geological conditions or core urban areas with high environmental protection requirements, the mining method construction often has problems such as high construction difficulty, high construction risk and long construction period. Therefore, under this background, with the development of mechanization, intelligence and automation technology of tunnel transportation construction, the mechanical method connecting channel T-connection technology is proposed through the spatial intensive design of mechanical equipment and civil engineering structures.

[0003] At present, in the existing mechanical method of connecting channel T-connection technology, in the construction of ultra-large diameter shield tunnels, one of the support methods used when opening the T-type connecting channel is a full-ring integral support structure. In the process of opening the T-type connecting channel, the entire main line tunnel space needs to be occupied. Therefore, when opening the T-type connecting channel, vehicles and materials cannot be transported and passed, and the two sides of the construction position cannot be connected, so that the T-type connecting channel can only be constructed after the main line tunnel is connected. Similarly, when constructing the T-type connecting channel, only when the construction of one T-type connecting channel is completed can the next T-type connecting channel be constructed. Multiple construction processes cannot be carried out simultaneously, which leads to slow construction progress and long construction period.

[0004] Therefore, the prior art still needs to be improved and developed. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a reverse-pull support structure for the excavation construction of a T-shaped connecting channel in a tunnel, so as to solve the problem in the prior art that during the construction of an ultra-large diameter shield tunnel, multiple construction processes cannot be carried out simultaneously, resulting in slow construction progress and a long construction period.

[0006] The utility model provides a reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel, comprising: a reverse force support seat for providing support force for excavation equipment along the excavation direction, a thrust transmission component for transmitting the thrust received by the reverse force support seat to the main line tunnel segment, and a first reinforcement support component for supporting the tensile stress of the inner arc surface of the arc top of the main line tunnel segment;

[0007] The reaction force support seat is connected to the main line tunnel segment via the thrust transmission assembly;

[0008] The first reinforcement support assembly is installed on the thrust transmission assembly and connected to the main line tunnel segment;

[0009] Wherein, the outer contour dimension of the anti-pull support structure along the axial projection of the main line tunnel is smaller than the diameter of the main line tunnel.

[0010] The utility model is further provided that the reaction force support seat comprises: a reaction force support frame and a reaction force support plate connected to the excavation equipment when providing support force for the excavation equipment along the excavation direction;

[0011] The reaction force support plate is installed on the reaction force support frame, and the reaction force support plate is connected to the main line tunnel segment via the thrust transmission component.

[0012] The utility model is further provided that the thrust transmission assembly comprises: an upper force transmission beam for transmitting the thrust received by the upper part of the reaction force support seat to the upper part of the main line tunnel segment, and a lower force transmission beam for transmitting the thrust received by the lower part of the reaction force support seat to the lower part of the main line tunnel segment;

[0013] The upper force transmission beam is arranged on the top of the tunneling equipment, and the top end of the reaction force support seat is connected to the main line tunnel segment through the upper force transmission beam;

[0014] The lower force transmission beam is arranged at the bottom of the tunneling equipment, and the bottom end of the reaction force support seat is connected to the main line tunnel segment through the lower force transmission beam.

[0015] The utility model is further arranged that the thrust transmission assembly further comprises: an upper support shoe and a lower support shoe;

[0016] The upper force transmission beam is connected to the main line tunnel segment via the upper support shoe, and the lower force transmission beam is connected to the main line tunnel segment via the lower support shoe. The upper support shoe and the lower support shoe are also connected to the main line tunnel segment respectively.

[0017] The utility model is further arranged that the connection surface between the upper support shoe and the main line tunnel segment and the connection surface between the lower support shoe and the main line tunnel segment are arc-shaped surfaces respectively.

[0018] The utility model is further arranged that the thrust transmission assembly also includes: a support column, one end of the support column is connected to the upper force transmission beam, and the other end of the support column is connected to the lower force transmission beam.

[0019] The utility model is further configured that the first reinforcement support assembly includes: a first reinforcement force support frame and a first arc-shaped support surface;

[0020] The first reinforcement force support frame is installed on the upper force transmission beam and is connected to the main line tunnel segment via the first arc-shaped support surface.

[0021] The utility model further provides that the reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel further includes: a second reinforcement support assembly for reinforcing and supporting the opening of the T-shaped connecting channel;

[0022] One end of the second reinforcement support assembly is connected to the upper force transmission beam, the other end of the second reinforcement support assembly is connected to the lower force transmission beam, and the second reinforcement support assembly is also connected to the main line tunnel segment.

[0023] The utility model is further arranged that the second reinforcement support assembly includes: a plurality of arc-shaped support columns, the arc-shaped support columns are arranged on both sides of the tunneling equipment, and the arc-shaped surface of the arc-shaped support column close to one side of the main line tunnel segment is connected to the main line tunnel segment.

[0024] The utility model provides a reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel, comprising a reaction force support seat for providing support force for excavation equipment along the excavation direction, a thrust transmission component for transmitting the thrust received by the reaction force support seat to the main line tunnel segment, and a first reinforcement support component for supporting the tensile stress of the inner arc surface of the arc top of the main line tunnel segment; the first reinforcement support component is installed on the thrust transmission component and connected to the main line tunnel segment; the reaction force support seat is connected to the main line tunnel segment via the thrust transmission component; wherein the outer contour size of the reverse pull support structure along the axial projection of the main line tunnel is smaller than the diameter of the main line tunnel. In the technical solution of the utility model, since the outer contour size of the anti-pull support structure along the axial projection of the main line tunnel is smaller than the diameter of the main line tunnel, a space is left between the anti-pull support structure installed in the main line tunnel and the main line tunnel, and when the anti-pull support structure is installed, no support parts need to be set on the passage side, so that when the connecting channel of the super-large diameter shield tunnel is constructed, the anti-pull support structure not only provides support for the tunneling equipment, but also meets the conditions for the simultaneous construction of the main line tunnel or other connecting channels, improves the construction efficiency of the super-large diameter shield tunnel to open a T-type connecting channel, and shortens the construction period. In addition, by setting the first reinforcement support component, the pipe segments in the main disturbance area during the cutting and breaking process are tightened and reinforced, which effectively limits the misalignment and opening deformation of the joints of the pipe segments of the main line tunnel during the construction of the T-type connecting channel, thereby ensuring construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 It is a structural diagram of a reverse-pull support structure used for excavation construction of a T-shaped connecting channel in a tunnel in the utility model.

[0027] Figure 2 It is a structural diagram from one perspective of a reverse-pull type support structure used for excavation construction of a T-shaped connecting channel in a tunnel in the utility model.

[0028] Figure 3 It is a structural diagram of a reverse-pull support structure in a main line tunnel segment used for excavation construction of a T-shaped connecting channel in a tunnel in one embodiment of the utility model.

[0029] Figure 4 This is a structural diagram of a main line tunnel construction material vehicle installed in a main line tunnel segment of a reverse pull support structure used for excavation construction of a T-shaped connecting channel in a tunnel in one embodiment of the utility model.

[0030] Figure 5 This is a structural diagram of a box culvert with a reserved groove in one embodiment of the utility model.

[0031] The marks in the attached drawings are: 1. reaction support seat; 11. reaction support frame; 12. reaction support plate; 2. thrust transmission assembly; 21. upper force transmission beam; 22. lower force transmission beam; 23. upper support shoe; 24. lower support shoe; 25. support column; 3. first reinforcement support assembly; 31. first reinforcement support frame; 311. first vertical beam; 312. second vertical beam; 313. first horizontal beam; 314. inclined support beam; 32. first arc-shaped support surface; 4. second reinforcement support assembly; 5. jacking system; 6. tunneling equipment; 7. reserved trench box culvert; 71. embedded reinforcement casting; 72. box culvert support; 73. main engine support; 74. rear support; 75. reserved trench for box culvert; 8. starting sleeve; 9. main line tunnel segment; 10. main line tunnel construction material vehicle; 20. ventilation pipe. DETAILED DESCRIPTION

[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0033] According to the Highway Tunnel Code, in the construction of urban rail transit, when the connecting length between two single-line tunnels is greater than 600m, a communication channel should be set up to meet the fire protection requirements. Among them, when setting up T-type communication channels for subway tunnels and municipal highway tunnels, the mining method is often used for construction. When dealing with complex geological conditions or core urban areas with high environmental protection requirements, the mining method construction often has problems such as high construction difficulty, high construction risk and long construction period. Therefore, under this background, with the development of mechanization, intelligence and automation technology in tunnel transportation construction, through the spatial intensive design of mechanical equipment and civil engineering structures, the mechanical method communication channel T-connection technology is proposed. This technology avoids some problems existing in the mining method. It has a wide range of applications, including various formation environments such as soft soil, fine sand, high water-rich sand and gravel, weathered rock formations, and composite formations. It has the characteristics of micro-reinforcement, full closure, strong support and intensiveness, realizing micro-reinforcement construction and fully mechanized construction in a small space, while also ensuring the structural safety of the entire construction process, which is the trend of future underground tunnel technology development. Mechanical method of connecting channel T-connection technology is mainly divided into shield method and jacking method. Both methods need to provide a jacking force to the tunneling equipment 6 to support its advancement during the excavation process of the tunneling equipment 6. Therefore, when using the mechanical method of connecting channel T-connection technology, a temporary support structure needs to be set up to allow the jacking force used to support the advancement of the tunneling equipment 6 to act on the main line tunnel segment 9 through the support structure.

[0034] At present, commonly used support structures include full-ring integral pre-support structures and top-push support structures. Among them, the full-ring integral support structure needs to occupy the entire main line tunnel space during the process of opening the T-type connecting channel. Therefore, vehicles and materials cannot be transported through the T-type connecting channel, and the two sides of the construction position cannot be connected, so that the T-type connecting channel can only be constructed after the main line tunnel is connected. Similarly, when constructing the T-type connecting channel, only when the construction of one T-type connecting channel is completed can the next T-type connecting channel be constructed. Multiple construction processes cannot be carried out at the same time, which leads to slow construction progress and long construction period. The top-push support structure consists of a reaction frame and a force transmission component. When the T-type connecting channel is opened, the top-push support structure is fixed in the main line tunnel and is opposite to the T-type connecting channel to be excavated. At the corresponding position, the force transmission component connects the reaction frame with the corresponding segment of the main line tunnel at the relative position of the starting end of the connecting channel, and the reaction frame provides support to the excavation equipment 6. The supporting force generated in the process is transmitted to the main line tunnel segment 9 at the relative position of the starting end of the T-shaped connecting channel through the force transmission component. Although the push-type support structure does not need to occupy the space of the entire main line tunnel and can ensure a certain amount of vehicles and materials passing through, the material volume is large in the super-large diameter shield tunnel. Since the push-type support structure will limit the height of the same side, it is not suitable for super-large diameter shield tunnels. At the same time, in the super-large diameter shield tunnel, the stiffness of the main line tunnel segment 9 is relatively small, and the T-shaped connecting channel has a greater impact on the main line tunnel during the opening process. The push-type support structure cannot effectively alleviate the impact of the opening effect of the connecting channel on the main line tunnel and ensure the safety of the construction process.

[0035] In view of the above technical problems, the utility model provides a reverse-pull support structure for excavation construction of a T-shaped connecting channel in a tunnel.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, the anti-pull support structure used for the excavation construction of a T-shaped connecting channel in a tunnel may include a reaction support seat 1, a thrust transmission assembly 2 and a first reinforcement support assembly 3; the reaction support seat 1 is used to provide support force for the excavation equipment 6 along the excavation direction; the thrust transmission assembly 2 is used to transmit the thrust received by the reaction support seat 1 to the main line tunnel segment 9; the first reinforcement support assembly 3 is used to support the tensile stress of the inner arc surface of the arc top of the main line tunnel segment; the reaction support seat 1 is connected to the main line tunnel segment 9 via the thrust transmission assembly 2; the first reinforcement support assembly 3 is installed on the thrust transmission assembly 2 and connected to the main line tunnel segment 9; wherein, the outer contour dimension of the anti-pull support structure along the axial projection of the main line tunnel segment 9 is smaller than the diameter of the main line tunnel segment 9.

[0037] In this embodiment, when constructing a T-shaped connecting channel, the tunneling equipment 6 is installed at a position corresponding to the T-shaped connecting channel to be excavated through the reaction force support seat 1 and the thrust transmission assembly 2. During the opening process of the tunneling equipment 6, the reaction force support seat 1 provides support force to the tunneling equipment 6. The top thrust generated by the tunneling equipment 6 to the reaction force support seat 1 is transmitted to the connected main line tunnel segment 9 through the thrust transmission assembly 2, thereby enabling the tunneling equipment 6 to perform normal construction. At the same time, the tensile stress of the inner arc surface of the arc top of the main line tunnel segment is supported by the first reinforcement support assembly 3.

[0038] In this embodiment, the outer contour size of the anti-pull support structure along the axial projection of the main line tunnel is smaller than the diameter of the main line tunnel, so that there is a space between the anti-pull support structure and the main line tunnel, and when the anti-pull support structure is installed, no support member is required on the passage side, so that when the super-large diameter shield tunnel communication channel is constructed, the anti-pull support structure not only provides support for the tunneling equipment 6, but also meets the conditions for the synchronous construction of the main line tunnel or other communication channels, improves the construction efficiency of the super-large diameter shield tunnel opening T-type communication channel, and shortens the construction period. In addition, by setting the first reinforcement support component 3, the pipe segment in the main disturbance area during the cutting and breaking process is tightened and reinforced, which effectively limits the misalignment and opening deformation of the joints of the main line tunnel pipe segment 9 during the construction of the T-type communication channel, and ensures construction safety; wherein, the passage side refers to the space left between the anti-pull support structure and the main line tunnel; synchronous construction means that during the construction of the T-type communication channel, the main line tunnel or other T-type communication channels or other construction processes can be constructed synchronously, that is, multiple processes are constructed simultaneously.

[0039] Here, it should be noted that when constructing main line tunnels of different diameters, the size of the space left between the counter-pull support structure and the main line tunnel needs to be reserved according to the specific sizes of the vehicles and materials that actually need to pass through during the construction. Therefore, when technical personnel in this field specifically apply the counter-pull support structure, they can design the outer contour size of the counter-pull support structure along the axial projection of the main line tunnel according to the specific size of the reserved space, that is, the actual size of the reaction force support seat 1 and / or the thrust transmission component 2 is designed according to the actual reserved space. Therefore, the counter-pull support structure can be applicable to the construction of main line tunnels of different diameters.

[0040] In some embodiments, Figure 1 , Figure 2 and Figure 3 As shown, the counter-pull support structure may include a reaction support frame 11 and a reaction support plate 12, wherein the reaction support plate 12 is used to connect with the excavation equipment 6 when providing support force for the excavation equipment 6 along the excavation direction, and the reaction support plate 12 is installed on the reaction support frame 11 and connected to the main line tunnel segment 9 through the thrust transmission component 2.

[0041] Specifically, the reaction force support plate 12 can be in the shape of a cubic plate. When constructing the T-shaped connection passage, the tunneling equipment 6 is installed on one side of the reaction force support plate 12.

[0042] Furthermore, the reaction force support frame 11 can be composed of several support columns 25. The several support columns 25 can be welded to the reaction force support plate 12 on the side away from the tunneling equipment 6 during construction, thereby strengthening the reaction force support plate 12. Among them, when welding the several support columns 25, those skilled in the art can determine the specific structure of the reaction force support frame 11 after welding according to actual needs. For example, the reaction force support frame 11 after welding is roughly in the shape of a "field" character. For another example, the reaction force support frame 11 after welding can be in the shape of an "I" character. No further limitation is made here.

[0043] In some embodiments, the thrust transmission assembly 2 can include an upper force transmission beam 21 and a lower force transmission beam 22. The upper force transmission beam 21 is used to transmit the thrust received by the upper part of the reaction force support seat 1 to the main line tunnel segment 9, and the lower force transmission beam 22 is used to transmit the thrust received by the lower part of the reaction force support seat 1 to the main line tunnel segment 9. Among them, the upper force transmission beam 21 is arranged on the top of the tunneling equipment 6, and the top end of the reaction force support seat 1 is connected to the main line tunnel segment 9 through the upper force transmission beam 21. The lower force transmission beam 22 is arranged at the bottom of the tunneling equipment 6, and the bottom end of the reaction force support seat 1 is connected to the main line tunnel segment 9 through the lower force transmission beam 22.

[0044] Specifically, the upper force transmission beam 21 can be a cubic beam. There are several of them, and the several cubic beams are arranged side by side in sequence on the top of the tunneling equipment 6, and the intervals between each adjacent cubic beam are equal. That is, the several cubic beams are arranged side by side and evenly on the top of the tunneling equipment 6. Among them, when arranging the cubic beam, one end of the cubic beam can be welded to the reaction force support plate 12 by welding, and the other end of the cubic beam can be welded to the main line tunnel segment 9.

[0045] In a specific embodiment, there can be three cubic beams. Of course, there can also be other numbers, such as four, five, etc. Those skilled in the art can determine the specific number according to actual needs.

[0046] Here, it should be noted that the upper force transmission beam 21 can also be of other structures. For example, the upper force transmission beam 21 can also be set as a columnar beam. For another example, the upper force transmission beam 21 can also be set as a plate-like structure, etc. Those skilled in the art can determine the specific structure of the upper force transmission beam 21 according to actual needs. No further limitation is made here.

[0047] In this embodiment, the specific structure and specific setting method of the lower force transmission beam 22 are the same as the above-mentioned upper force transmission beam 21, and the only difference is that the setting position is different, that is, the upper force transmission beam 21 is arranged at the top of the excavation equipment 6, and the lower force transmission beam 22 is arranged at the bottom of the excavation equipment 6. Therefore, the specific structure and specific setting method of the lower force transmission beam 22 will not be repeated here.

[0048] Furthermore, the thrust transmission assembly may also include an upper support shoe 23 and a lower support shoe 24, wherein the upper force transmission beam 21 is connected to the main line tunnel segment 9 via the upper support shoe 23, and the lower force transmission beam 22 is connected to the main line tunnel segment 9 via the lower support shoe 24, and the upper support shoe 23 and the lower support shoe 24 are also connected to the main line tunnel segment 9 respectively.

[0049] In this embodiment, when the upper force transmission beam 21 is connected to the mainline tunnel segment 9, one end of the upper force transmission beam 21 connected to the mainline tunnel segment 9 can be welded to the upper support shoe 23, and then the upper support shoe 23 is welded to the mainline tunnel segment 9, so that the upper force transmission beam 21 can transfer the thrust to the mainline tunnel segment 9 through the upper support shoe 23. In addition, because the upper support shoe 23 is provided, the diffusion of the opening door effect of the T-shaped connecting channel can be reduced, and at the same time, the stiffness of the mainline tunnel segment 9 at the door is improved.

[0050] Similarly, when the lower force transmission beam 22 is connected to the lower support shoe 24, the specific connection method is the same as that of the upper force transmission beam 21 and the upper support shoe 23, which will not be repeated here.

[0051] In some embodiments, Figure 1 , Figure 2 and Figure 3 As shown, the upper support shoe 23 may be roughly in the form of a cubic structure, and an arc-shaped surface is provided at one end thereof connected to the mainline tunnel segment 9. The arc-shaped surface makes the connection between the upper support shoe 23 and the mainline tunnel segment 9 more closely fitted, further reducing the diffusion of the portal effect of the T-shaped connecting channel, and further improving the rigidity of the mainline tunnel segment 9 at the portal.

[0052] Among them, the specific structure of the lower support shoe 24 is the same as the above-mentioned upper support shoe 23, which further reduces the diffusion of the opening effect of the T-shaped connecting channel and further improves the rigidity of the main line tunnel segment 9 at the portal, and will not be repeated here.

[0053] Further, the thrust transmission assembly 2 further includes a support column 25, wherein one end of the support column 25 is connected to the upper force transmission beam 21, and the other end of the support column 25 is connected to the lower force transmission beam 22. Specifically, two support columns 25 may be provided, and the two support columns 25 are arranged on both sides of the excavation equipment 6, wherein one support column 25 is installed between the outermost upper force transmission beam 21 and the outermost lower force transmission beam 22 by welding, that is, one end of one support column 25 is welded to the outermost upper force transmission beam 21, and the other end of the support column 25 is welded to the outermost lower force transmission beam 22, and the other support column 25 is installed between the innermost (opposite to the outermost) upper force transmission beam 21 and the innermost lower force transmission beam 22, and it is also installed by welding.

[0054] In this embodiment, the provision of the support column 25 further forms a support between the upper force transmission beam 21 and the lower force transmission beam 22, thereby reinforcing the anti-pull support structure.

[0055] Here, it should be noted that the number of support columns 25 is not limited to the above-mentioned two. For example, it can also be set to four, with two support columns 25 on both sides of the tunneling equipment 6; for another example, it can also be set to six, with three support columns 25 on both sides of the tunneling equipment 6. Those skilled in the art can determine the specific number of support columns 25 according to actual needs, which will not be repeated here.

[0056] In some embodiments, the first reinforcement support assembly 3 may include a first reinforcement force support frame 31 and a first arc-shaped support surface 32 , wherein the first reinforcement force support frame 31 is installed on the upper force transmission beam 21 and connected to the main line tunnel segment 9 via the first arc-shaped support surface 32 .

[0057] Specifically, the first reinforcement force support frame 31 may include a first vertical beam 311, a first horizontal beam 313, a second vertical beam 312 and an oblique support beam 314, one end of the first vertical beam 311 is welded to the top of the first arc-shaped support surface 32, the other end of the first vertical beam 311 is welded to the upper force transmission beam 21, the second vertical beam 312 is arranged parallel to the first vertical beam 311, one end of the oblique support beam 314 is welded to the end of the first vertical beam 311 connected to the upper force transmission beam 21, and the oblique support beam 314 is welded to the end of the first vertical beam 311 connected to the upper force transmission beam 21. The other end is welded to the first arc-shaped supporting surface 32, wherein the inclination angle of the oblique support beam 314 relative to the upper force transmission beam 21 is approximately 45°, one end of the first cross beam 313 is welded to one end of the oblique support beam 314 connected to the first arc-shaped supporting surface 32, the other end of the first cross beam 313 is welded to the first vertical beam 311, one end of the second vertical beam 312 is welded to one end of the oblique support beam 314 connected to the first arc-shaped supporting surface 32, and the other end of the second vertical beam 312 is welded to the upper force transmission beam 21.

[0058] In this embodiment, the first reinforcement force support frame 31 and the first arc-shaped support surface 32 are combined to tighten and reinforce the pipe segments in the main disturbance area during the cutting and breaking process, thereby effectively limiting the misalignment and opening deformation of the joints of the main line tunnel pipe segments 9 during the construction of the T-shaped connecting channel, thereby ensuring construction safety.

[0059] Here, it should be noted that the first reinforcement force support frame 31 can also be other structures that can achieve the above-mentioned purpose. When applying it in specific applications, technical personnel in this field can determine the specific structure of the first reinforcement force support frame 31 according to actual needs under the inventive concept of this application, and no excessive restrictions are made here.

[0060] In some embodiments, Figure 1 , Figure 2 and Figure 3 As shown, the reverse-pull support structure used for excavation construction of a T-shaped connecting channel in a tunnel may also include a second reinforcement support assembly 4, which is used to reinforce and support the opening of the T-shaped connecting channel, wherein one end of the second reinforcement support assembly 4 is connected to the upper force transmission beam 21, and the other end of the second reinforcement support assembly 4 is connected to the lower force transmission beam 22, and the second reinforcement support assembly 4 is also connected to the main line tunnel segment 9.

[0061] In this embodiment, the second reinforcement support assembly 4 may include a plurality of arc-shaped support columns 25, which are arranged on both sides of the tunneling equipment 6, wherein the arc-shaped surface of the arc-shaped support column 25 close to the main line tunnel segment 9 is connected to the main line tunnel segment 9.

[0062] Specifically, two arc-shaped support columns 25 can be provided, one on each side of the excavation equipment 6. Of course, other numbers of arc-shaped support columns 25 can also be provided. For example, four arc-shaped support columns 25 can be provided, two on each side of the excavation equipment 6; for another example, six arc-shaped support columns can be provided, three on each side of the excavation equipment 6.

[0063] Since the arc support column 25 has an arc surface and the arc surface is connected to the main line tunnel segment 9, when the excavation equipment 6 opens a hole, the arc support column 25 further weakens the diffusion of the T-shaped connecting channel opening door effect, and at the same time, further improves the rigidity of the main line tunnel segment 9.

[0064] It should be noted that the second reinforcement support assembly 4 may also be other structures capable of achieving the above functions. Those skilled in the art may determine the specific structure of the second reinforcement support assembly 4 according to specific practical needs, and no further elaboration will be made here.

[0065] Furthermore, if Figure 4 , Figure 5As shown, the application of the reverse pull support structure in a T-shaped communication channel in an ultra-large diameter shield tunnel is specifically opened. A reserved groove box culvert 7 and a ventilation pipe 20 are arranged in the main line tunnel segment 9 of the ultra-large diameter shield tunnel. The ventilation pipe 20 is arranged above the main line tunnel segment 9. A box culvert support 72 is arranged in the reserved groove box culvert 7. A main machine support 73 is arranged on one side of the box culvert support 72. Rebar casting 71 is performed between the main machine support 73 and the main line tunnel segment 9. A rear support 74 is arranged on the other side of the box culvert support 72. Rebar casting 71 is performed between the rear support 74 and the main line tunnel segment 9. Then the reverse pull support structure is used. When installing the pull-type support structure, first install the reaction support seat 1 and the thrust transmission assembly 2 at the position where a T-shaped communication channel needs to be opened in the main line tunnel. When installing, the lower force transmission beam 22 in the thrust transmission assembly 2 is embedded in the reserved groove 75 of the box culvert, that is, the pull-type support structure is installed in the reserved groove 75 of the reserved groove box culvert 7; then, the excavation equipment 6, the jacking system 5 and the starting sleeve 8 are installed in sequence. After installation, the support column 25, the upper force transmission beam 21, the upper support shoe 23 and the arc support column 25 are assembled in sequence. When assembling, they can be assembled by welding; finally, The first reinforcement support assembly 3, the lower force transmission beam 22 and the lower support shoe 24 are assembled to complete the installation of the reverse pull support structure, the excavation equipment 6, the starting sleeve 8 and the jacking system 5, that is, the construction of the T-shaped connecting channel can be started. Since the outer contour size of the reverse pull support structure along the axial projection of the main line tunnel is smaller than the diameter of the main line tunnel, a space is left between the reverse pull support structure installed in the main line tunnel and the main line tunnel, and when the reverse pull support structure is installed, no support parts are required on the passage side, so that when the connecting channel of the super-large diameter shield tunnel is constructed, the reverse pull support structure is not only The tunneling equipment 6 provides support force and meets the conditions for the simultaneous construction of the main line tunnel or other connecting channels, improves the construction efficiency of opening T-shaped connecting channels in ultra-large diameter shield tunnels, and shortens the construction period. In addition, by setting the first reinforcement support component, the pipe segments in the main disturbance area during the cutting and breaking process are tightened and reinforced, which effectively limits the misalignment and opening deformation of the joints of the main line tunnel segments 9 during the construction of the T-shaped connecting channel, thereby ensuring construction safety. In this specific application, the inner arc tensile stress at the bottom of the main line tunnel segment 9 is supported by the main support 73, the box culvert support 72 and the rear support 74.

[0066] In addition, technicians in this field can determine the specific size of the counter-pull support structure according to actual needs (for example, the diameter of the main line tunnel, and for example, the space required for the passage of the main line tunnel construction material vehicle 10). Therefore, it has a wider applicability and is suitable for use in ultra-large diameter shield tunnels. It can effectively alleviate the impact of the opening effect of the connecting channel on the main line tunnel and ensure the safety of the construction process.

[0067] In summary, the utility model provides a reverse-pull support structure for excavation construction of a T-shaped connecting channel in a tunnel, which has the following effects.

[0068] The outer contour dimension of the anti-pull support structure along the axial projection of the main line tunnel is smaller than the diameter of the main line tunnel, so that there is space between the anti-pull support structure and the main line tunnel, and when the anti-pull support structure is installed, no support parts need to be set on the passage side, so that when the connecting channel of the super-large diameter shield tunnel is constructed, the anti-pull support structure not only provides support for the excavation equipment 6, but also meets the conditions for the simultaneous construction of the main line tunnel or other connecting channels, thereby improving the construction efficiency of the super-large diameter shield tunnel opening T-type connecting channel and shortening the construction period. In addition, by setting the first reinforcement support component 3, the pipe segments in the main disturbance area during the cutting and breaking process are tightened and reinforced, which effectively limits the misalignment and opening deformation of the joints of the main line tunnel pipe segments 9 during the construction of the T-type connecting channel, thereby ensuring construction safety.

[0069] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. A reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel, characterized in that: include: A reaction force support seat for providing support force for the excavation equipment along the excavation direction, a thrust transmission component for transmitting the thrust received by the reaction force support seat to the main line tunnel segment, and a first reinforcement support component for supporting the tensile stress of the inner arc surface of the arc top of the main line tunnel segment; The reaction force support seat is connected to the main line tunnel segment via the thrust transmission assembly; The first reinforcement support assembly is installed on the thrust transmission assembly and connected to the main line tunnel segment; Wherein, the outer contour dimension of the anti-pull support structure along the axial projection of the main line tunnel is smaller than the diameter of the main line tunnel.

2. The reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel according to claim 1 is characterized in that: The reaction force support seat comprises: a reaction force support frame and a reaction force support plate connected to the excavation equipment when providing support force for the excavation equipment along the excavation direction; The reaction force support plate is installed on the reaction force support frame, and the reaction force support plate is connected to the main line tunnel segment via the thrust transmission component.

3. The reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel according to claim 1 is characterized in that: The thrust transmission assembly comprises: an upper force transmission beam for transmitting the thrust received by the upper part of the reaction support seat to the upper force transmission beam of the main line tunnel segment, and a lower force transmission beam for transmitting the thrust received by the lower part of the reaction support seat to the lower force transmission beam of the main line tunnel segment; The upper force transmission beam is arranged on the top of the tunneling equipment, and the top end of the reaction force support seat is connected to the main line tunnel segment through the upper force transmission beam; The lower force transmission beam is arranged at the bottom of the tunneling equipment, and the bottom end of the reaction force support seat is connected to the main line tunnel segment through the lower force transmission beam.

4. The reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel according to claim 3 is characterized in that: The thrust transfer assembly further comprises: an upper gripper shoe and a lower gripper shoe; The upper force transmission beam is connected to the main line tunnel segment via the upper support shoe, and the lower force transmission beam is connected to the main line tunnel segment via the lower support shoe. The upper support shoe and the lower support shoe are also connected to the main line tunnel segment respectively.

5. The reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel according to claim 4, characterized in that: The connection surface between the upper support shoe and the main line tunnel segment and the connection surface between the lower support shoe and the main line tunnel segment are arc-shaped surfaces respectively.

6. The reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel according to claim 5, characterized in that: The thrust transmission assembly further includes a support column, one end of which is connected to the upper force transmission beam, and the other end of which is connected to the lower force transmission beam.

7. The reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel according to claim 6, characterized in that: The first reinforcement support assembly includes: a first reinforcement force support frame and a first arc-shaped support surface; The first reinforcement force support frame is installed on the upper force transmission beam and is connected to the main line tunnel segment via the first arc-shaped support surface.

8. The reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel according to any one of claims 3 to 7, characterized in that: The reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel further comprises: a second reinforcement support assembly for reinforcing and supporting the opening of the T-shaped connecting channel; One end of the second reinforcement support assembly is connected to the upper force transmission beam, the other end of the second reinforcement support assembly is connected to the lower force transmission beam, and the second reinforcement support assembly is also connected to the main line tunnel segment.

9. The reverse pull support structure for excavation construction of a T-shaped connecting channel in a tunnel according to claim 8, characterized in that: The second reinforcement support assembly includes: a plurality of arc-shaped support columns, which are arranged on both sides of the tunneling equipment, and the arc-shaped surfaces of the arc-shaped support columns close to one side of the main line tunnel segment are connected to the main line tunnel segment.

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