Multi-layer tunnel structure with connected upper well and lower well and construction method of multi-layer tunnel structure

Abstract

The invention provides a multi-layer tunnel structure (M) with an upper well connected with a lower well and a construction method (M) of the multi-layer tunnel structure (M). To this end, the present invention comprises: an upper and lower well formation step for drilling an upper well and a lower well having a circular cross-section adjacent to each other by a heading machine; a support frame installation step of installing a support frame passing between the upper well and the lower well, the bottom of the support frame being located above the lower well, and the top of the support frame supporting the upper well; a side portion forming step of digging the upper half portion of the upper well and the lower half portion of the lower well in communication with each other to form a side portion, except for the upper half portion of the upper well and the lower half portion of the lower well; and a plate forming step of forming at least one plate on the side surface portion to separate the upper layer and the lower layer. Therefore, according to the multi-layer tunnel structure with the upper well connected with the lower well and the construction method of the multi-layer tunnel structure, independent excavation of the upper well and the lower well with the circular cross section can be achieved through the heading machine, the circular cross section is drilled according to the shape of the heading machine, and therefore drilling is easy, working hours are shortened, and economic effects are achieved.

Description

Technical Field

[0001] The present invention relates to a multi-layer tunnel structure in which an upper shaft and a lower shaft are connected, and a construction method thereof. More specifically, the present invention relates to a method of drilling adjacent holes of a circular cross-section upper shaft and a lower shaft using a tunneling machine, forming linings on the inner circumferential surfaces respectively, installing a support frame to penetrate between the upper shaft and the lower shaft, excavating the lower half of the upper shaft and the upper half of the lower shaft in a communicating manner to form side faces while the upper shaft is supported, forming a wall lining to extend to the lining, and forming at least one plate for separating the upper layer and the lower layer on the side faces, and a construction method thereof for the multi-layer tunnel structure. Background Art

[0002] Due to the increase in population and vehicles, major cities around the world are facing serious traffic congestion. Although environmental problems caused by the gradual replacement of existing internal combustion engine vehicles with electric vehicles are expected to be solved in the near future, severe traffic congestion will remain a continuous obstacle for humans to minimize time and space limitations.

[0003] To solve these problems, recently, a metropolitan area railway network has been constructed by installing an urban railway network, or to solve frequent traffic congestion, a large-depth underground road has been newly built by three-dimensionally utilizing narrow spaces. The above-ground part is BRT, a central bus lane, etc., and the underground part is used for vehicle movement.

[0004] In particular, foreign tunnel construction service companies are focusing on technology development using underground tunnels, solving traffic problems, restoring urban landscapes, and developing new rapid transportation means. A new concept excavator, Prufrock, has been proposed and is still under continuous research and development.

[0005] It is expected that a new concept of transportation means will be developed in the near future. A tunnel network will be formed underground in the center of major cities, and some ground sections will be elevated for continuous vehicle driving, like a road network similar to human capillaries. In particular, when a passenger inputs a destination and boards a driverless vehicle combined with an autonomous driving vehicle, it can explore the route by itself and reach the destination, and effectively utilize the road surface area by minimizing the vehicle spacing, and can maximize the number of traveling passengers.

[0006] However, due to the limited space utilization rate in the city center, it is necessary to increase the road surface area through multiple layers from the tunnel excavation stage. However, as Figure 1a shown, most of the proposed existing multi-layer tunnels form a circular hole 1 large enough to form multiple layers at one time, and form a lining 2 and a plate 3 inside the circular hole 1. Therefore, there is a limitation in that the excavation area is unnecessarily increased, and the construction cost and construction period inevitably increase.

[0007] Meanwhile, in order to achieve the efficient multi-layer construction of tunnels, the "Multi-layer Tunnel Construction Method" of Korean Registered Patent No. 10-2136951 (registered on July 16, 2020, hereinafter referred to as the "Prior Art Document") was proposed. In the above prior art document, as Figure 1b shown, when constructing a multi-layer tunnel composed of a top and a bottom, first, the upper tunnel 1a is excavated, and then, after installing an easily removable arch forming part 4 under the upper tunnel, the upper part of the lower tunnel 1b to be excavated is reinforced by pouring slab concrete on the upper part. Thereafter, the arch forming part 4 is removed, and the lower tunnel 1b is excavated under the slab concrete 3.

[0008] The advantages of the above prior art document are that the slab concrete 3 formed by the arch forming part 4 can be directly used as the slab for double-layer construction. However, for the drilling of the lower tunnel, it is difficult to precisely form the bottom surface of the slab concrete into an arch shape. In addition, when using an excavator such as a TBM, precise drilling needs to be carried out along the bottom surface of the slab concrete, but there is a problem that the slab concrete is easily damaged due to construction errors. Summary of the Invention

[0009] Technical Problems to be Solved

[0010] The present invention is proposed in view of the above-mentioned many problems, and its purpose is to provide a multi-layer tunnel structure and its construction method in which the upper shaft and the lower shaft can be independently excavated, drilling is easy and economical, and various specifications of multi-layer tunnel structures with a minimum of 12 feet can be formed, the construction performance is excellent, the side face construction can be simplified by effectively supporting the upper shaft, and the position of the slab can be freely formed according to the site conditions, and the upper shaft and the lower shaft are connected.

[0011] Technical Solution

[0012] In order to achieve the above object, a construction method of a multi-layer tunnel structure in which an upper shaft and a lower shaft are connected according to the present invention is characterized by including: an upper and lower shaft forming step S10 of using a tunneling machine to drill adjacent circular-section upper shaft 10 and lower shaft 20; a support frame installation step S20 of installing a support frame 100 to pass through between the upper shaft 10 and the lower shaft 20, the bottom of the support frame 100 being located on the lower shaft 20 and the top supporting the upper shaft 10; a side face forming step S30 of excavating the lower half 10b of the upper shaft 10 and the upper half 20a of the lower shaft 20 to communicate with each other except for the upper half 10a of the upper shaft 10 and the lower half 20b of the lower shaft 20 to form a side face 30; and a slab forming step S40 of forming at least one slab 40 on the side face 30 to separate the upper layer and the lower layer.

[0013] The up-and-down well forming step S10 includes: an up-and-down well drilling step S11 for drilling the upper well 10 and the lower well 20; and a lining forming step S12 for forming linings 11 and 21 on the inner circumferential surfaces of the upper well 10 and the lower well 20 respectively.

[0014] The side face forming step S30 includes: a side face excavation step S32 for excavating the lower half 10b of the upper well 10 and the upper half 20a of the lower well 20 in a communicating manner; a wall lining forming step S34 for forming a wall lining 31 on the side face 30; and a support frame removing step S35 for removing the support frame 100.

[0015] The side face forming step S30 further includes: a lining removing step S31 for removing the linings formed on the lower half 10b of the upper well 10 and the upper half 20a of the lower well 20.

[0016] The side face forming step S30 further includes: a side face reinforcement step S33 for reinforcement by inserting a ground beam 35 into the excavated side face 30.

[0017] The plate forming step S40 includes: a main plate forming step S41 for connecting both sides of the side face 30 to form a main plate 41; and a lower plate forming step S42 for connecting the lower half 20b of the lower well 20 to form a lower plate 42.

[0018] A support portion 110 for supporting the upper well 10 is formed at the top of the support frame 100, and a base portion 120 installed on the lower well 20 is formed at the bottom. The support portion 110 and the base portion 120 are assembled into one body by a connecting rod 130.

[0019] The support portion 110 has an annular frame 111 for supporting the upper well 10. The annular frame transmits the load to the connecting rod 130 through a support frame 112. The base portion 120 transmits the load received from the connecting rod 130 to a base portion 122, and the base portion 122 is arranged to contact the lower well 20.

[0020] On the other hand, the multi-layer tunnel structure MT in which the upper well and the lower well of the present invention are connected is a multi-layer tunnel structure that utilizes the upper well 10 and the lower well 20 that are perforated close to the ground with a circular cross-section. It is characterized in that the upper half 10a of the upper well 10 and the lower half 20b of the lower well 20 are excavated to be connected, forming a vertical side face 30. Linings 11 and 21 are formed on the upper half 10a of the upper well 10 and the lower half 20b of the lower well 20. A wall lining 31 extending to the linings 11 and 21 is formed on the side face 30. At least one plate 40 is formed on the side face 30 to separate the upper layer and the lower layer.

[0021] In the plate 40, a main board 41 is formed to connect both sides of the side surface part 30, and a lower board 42 is formed to connect the lower half part 20b of the lower well 20. A facility space PS is provided at the bottom of the lower board 42.

[0022] Advantageous effects

[0023] Regarding the multi - layer tunnel structure with an upper well and a lower well connected according to the present invention and its construction method, it is sufficient to drill the circular - cross - section upper well and lower well close to each other using a tunneling machine, and they can be excavated independently, having the advantage of high - efficiency drilling.

[0024] In particular, since separate upper and lower wells do not require a separate process of forming a bottom or cleaning, a circular cross - section can be drilled corresponding to the shape of the excavator. Thus, drilling is easy, working hours are shortened, and there is an economic effect.

[0025] In addition, according to the specifications of the tunneling machine, a multi - layer tunnel structure with a minimum of 12 feet to different specifications can be formed, ensuring the freedom of design and allowing the position of the plate to be freely formed.

[0026] In addition, since the lower end of the support frame can be simply set in a state of being installed in the lower half part of the lower well, and the top supports the upper half part of the upper well, enabling the lower half part of the upper well and the upper half part of the lower well to communicate, the side surface part can be simply constructed.

[0027] In addition, since it is possible to assemble around the support hole between the upper well and the lower well and the support part of the support frame, it has the advantage of being easy to install the support frame.

[0028] And, when the support frame supports the upper half part of the upper well, the excavated side surface part can be reinforced with a ground beam, thereby ensuring the stability of the side surface part construction. Description of the drawings

[0029] Figure 1a It is a cross - sectional view showing a multi - layer tunnel constructed using a TBM according to the prior art.

[0030] Figure 1b It is a cross - sectional view showing the construction method of a multi - layer tunnel according to the prior - art literature in sequence.

[0031] Figure 2 It is a block diagram showing the construction method of a multi - layer tunnel structure according to the present invention in chronological order.

[0032] Figure 3 It is a conceptual cross - sectional view showing the entire process of the construction method of a multi - layer tunnel structure according to an embodiment of the present invention.

[0033] Figure 4It is a conceptual cross-sectional view showing in sequence the detailed process of the support frame installation steps according to an embodiment of the present invention.

[0034] Figure 5a It is a perspective view showing the installation state of the support frame according to an embodiment of the present invention.

[0035] Figure 5b It is a perspective view showing the installation state of the support frame according to another embodiment of the present invention.

[0036] Figure 6a and Figure 6b It is a conceptual cross-sectional view showing in sequence the detailed process of the side surface formation step according to an embodiment of the present invention.

[0037] Figure 7 It is a cross-sectional view showing a multi-layer tunnel structure according to another embodiment of the present invention. Detailed Description of the Invention

[0038] Hereinafter, based on the matters shown in the drawings, the multi-layer tunnel structure MT and its construction method M for connecting the upper well and the lower well of the present invention will be described in detail based on the preferred embodiments.

[0039] First, the construction method M of the multi-layer tunnel structure connecting the upper well and the lower well of the present invention is described. As Figure 2 shown in the block diagram, the construction method M of the multi-layer tunnel structure of the present invention includes an upper and lower well formation step S10, a support frame installation step S20, a side surface formation step S30, and a plate formation step S40.

[0040] As Figure 3 shown, the upper and lower well formation step S10 is a step of using an excavator to drill the upper well 10 and the lower well 20 with a circular cross-section close to the ground. The excavator can be selectively adopted with a diameter corresponding to the width of the tunnel to be constructed, and can be drilled into various specifications, with the minimum specification being 12 feet, corresponding to the road width. At this time, preferably, the upper well 10 and the lower well 20 are formed to have the same diameter.

[0041] For the upper well 10 and the lower well 20, one of the wells can be dug out a predetermined length first, and then the remaining wells can be dug out in parallel. However, preferably, the lower well 10 is dug out first, and then the upper well 20 is dug out, so that the upper well 20 is spaced a predetermined distance from the lower well 10, and only the upper and lower heights are different at the corresponding positions. At the same time, according to the embodiment, in the case where the ground is a hard rock formation, a pair of excavators can also be constructed to respectively excavate the upper well 10 and the lower well 20 to further reduce the air.

[0042] In addition, since the upper shaft 10 and the lower shaft 20 can be drilled to have a circular cross-section corresponding to the shape of the tunneling machine, the construction efficiency is improved, and the upper shaft 10 and the lower shaft 20 are excavated independently at a predetermined distance from each other, so it has the advantages of easy drilling and reduced air.

[0043] Meanwhile, the upper and lower shaft forming step S10 may include an upper and lower shaft drilling step S11 of drilling the upper shaft 10 and the lower shaft 20, and a lining forming step S12 of forming linings 11 and 21 on the inner circumferential surfaces of the upper shaft 10 and the lower shaft 20 respectively. The linings 11 and 21 formed in the upper shaft 10 and the lower shaft 20 are assembled and constructed in a manner of misplacing prefabricated segmental blocks 11a and 21a to correspond to the curvatures of the upper shaft 10 and the lower shaft 20, and according to the embodiment, they can be manufactured by forming a concrete layer with a predetermined thickness on the surface.

[0044] Subsequently, in the support frame installation step S20, as Figure 3 shown, the support frame 100 is installed to pass through between the upper shaft 10 and the lower shaft 20, and the bottom of the support frame 100 is located on the lower shaft 20, and the top supports the upper shaft 10.

[0045] A support portion 110 for supporting the upper shaft 10 is formed at the top of the support frame 100, and a base portion 120 for mounting on the lower shaft 20 and accommodating the upper load is formed at the bottom. The support portion 110 and the base portion 120 can be assembled into one body by a connecting rod 130 that passes through the upper shaft 10 and the lower shaft 20 in a separated state respectively.

[0046] Therefore, in the support frame installation step S20, a support hole 15 can be formed at the center of the top of the lower shaft 20 to pass through the upper shaft 10. That is, the support hole 15 vertically passes through a length corresponding to the interval distance between the upper shaft 10 and the lower shaft 20, and the connecting rod 130 is inserted into the support hole 15 so that the support portion 110 and the base portion 120 can be assembled into one body. Therefore, it has the advantage of easy installation and disassembly of the support frame 100.

[0047] Meanwhile, the support portion 110 can be formed into a semi-circular structure so as to be able to effectively support in a state of contacting the upper half 10a of the upper shaft 10, and the connecting rod 130 can be integrally formed and assembled with either the support portion 110 or the base portion 120, and the support portion 110, the base portion 120 and the connecting rod 130 can also be assembled with each other in a separated state. In addition, according to the embodiment, the frames constituting the support portion 110 and the base portion 120 can also be formed to be selectively disassembled and assembled to ensure constructability.

[0048] As Figure 3As shown, the subsequent side face forming step S30 is a step of connecting and excavating the lower half 10b of the upper well 10 and the upper half 20a of the lower well 20 other than the lower half 10a of the upper well 10 and the lower half 20b of the lower well 20 to form a straight side face 30 in the vertical direction.

[0049] At this time, since the upper half 10a of the upper well 10 is supported by the support portion 110 of the support frame 100, even if the lower half 10b of the upper well 10 and the upper half 20a of the lower well 20 are excavated, the upper half 10a of the upper well 10 will not collapse and can be stably supported. Therefore, the ease of construction can be promoted when forming the side face 30 described later.

[0050] The side face forming step S30 may include a lining removing step S31 for removing the lining formed in the lower half 10b of the upper well 10 and the upper half 20a of the lower well 20. At this time, in the linings 11 and 21 of the upper well 10 and the lower well 20, the segmented blocks 11a and 21a located at the boundary between the upper half and the lower half have a structure that is easily broken or separated, or semi-segmented blocks can be configured.

[0051] In addition, when forming the lining of the concrete layer, by forming a vulnerable part with a construction joint, the linings 11 and 21 located in the lower half 10b of the upper well 10 and the upper half 20a of the lower well 20 can be easily removed.

[0052] In addition, the side face forming step S30 may include a wall body lining forming step S34 for forming a wall body lining 31 in the side face 30. Thus, the linings 11 and 21 remaining on the upper half 10a of the upper well 10 and the lower half 20b of the lower well 20 are configured to be continuous with the wall body lining 31, so that a residual lining 11 and 21 is formed on the upper half 10a of the upper well 10 and the lower half 20b of the lower well 20, and a tunnel structure with wall body linings 31 formed on both sides. At this time, the wall body lining 31 can also be formed by assembling and arranging segmented blocks 31a, and the side face 30 can also be formed by forming the lining of the concrete layer.

[0053] The subsequent plate forming step S40 is, as Figure 3 shown, a step of forming at least one plate 40 on the side face 30 to separate the upper layer and the lower layer. The plate 40 can be assembled and configured such that the PC block 40a is connected to the side face 30. For this purpose, the connecting steel bars can be exposed on the side face 30. In addition, the plate 40 can be manufactured by assembling formwork, reinforcing steel bars, and curing in-situ cast concrete.

[0054] At this time, the board forming step S40 may include a main board forming step S41 of forming a main board 41 for connecting both sides of the side surface portion 30 and a lower board forming step S42 of forming a lower board 42 for connecting the lower half portion 20b of the lower well 20.

[0055] The main board 41 performs inherent functions such as the movement of the mobile device and is formed in more than one. That is, in the case where the diameters of the upper well 10 and the lower well 20 are relatively large, a multi-layer tunnel structure can be constructed by forming a plurality of main boards 41.

[0056] In addition, a lower board 42 is formed at the lowermost end to connect the lower half portion 20b of the lower well 20, and a facility space PS can be provided so that a drain pipe or telecommunication wiring can move at the bottom of the lower board 42. At this time, construction can be carried out from bottom to top, and the main board forming step S41 is performed after first performing the lower board forming step S42.

[0057] According to the construction method M of the multi-layer tunnel structure in which the upper well and the lower well of the present invention described above are connected, since the circular cross-section upper well and lower well can be independently excavated by a tunneling machine respectively, the construction efficiency is improved. According to the specifications of the tunneling machine, a multi-layer tunnel structure MT of various specifications starting from at least 12 feet can be formed. Therefore, the degree of freedom in design is ensured, the position of the board 40 can be freely formed, and it has the advantage of being easy to install and disassemble the support frame 100.

[0058] Next, the support frame installation step S20 and the side surface portion forming step S30 will be described in more detail.

[0059] The support frame installation step S20 is, as Figure 4 shown, preferably, first, a base installation step S21 of installing the base 120 of the support frame 100 in the lower well 20 is performed. In the base installation step S21, a connecting rod 130 is integrally or detachably formed on the top of the base 120 and is arranged to pass through the support hole 15.

[0060] While installing the base 120, a support portion installation step S22 of installing the support portion 110 of the support frame 100 on the upper well 10 is performed. The lower end of the support portion 110 is connected to the connecting rod 130 so that the upper half portion 10a of the upper well 10 can be stably supported on the support frame 100.

[0061] At the same time, as Figure 5a shown, the support portion 110 of the upper well 10 for supporting the support frame 100 installed in the support frame installation step S20 is used to support the upper half portion 10a of the upper well 10, and an arc-shaped ring 111 is connected to the support frame 112 to transmit the load to the connecting rod 130.

[0062] Meanwhile, as Figure 5b shown, a plurality of nut holes 11b are formed in the lining 11 installed in the upper well 10, and the annular frame 111 of the support portion 110 can be made in a frame shape. At this time, through holes are formed at positions corresponding to the nut holes 11b of the annular frame 111 respectively, so that bolts can connect the annular frame 111 and the lining 11 to each other.

[0063] In addition, the annular frame 111 and the support frame 112 are formed to be capable of being fastened and separated from each other, and even if the support frame 100 is removed, the annular frame 111 can be made into a truss structure, so that it can be retained to permanently support the upper half 10a of the upper well 10.

[0064] Meanwhile, as Figure 5b shown, on both lower ends of the lining 11 or the segment block 11a constructed on the upper half 10a of the upper well 10, metal reinforcement pieces 11c having a predetermined thickness in the length direction can be formed to stably support the annular frame 111 while ensuring sufficient rigidity. At this time, preferably, the nut holes 11b are also formed in the reinforcement pieces 11c. The reinforcement pieces 11c also perform a reinforcement function, so that the segment block 11a can be stably supported on the lower side face 30.

[0065] At this time, reinforcement fastening portions 111a having a shape corresponding to the reinforcement pieces 11c are also formed at the lower ends on both sides of the annular frame 111, and through holes 111b are formed at positions corresponding to the reinforcement fastening portions 111a, so that fastening bolts can penetrate and be fastened to the nut holes 11b. Therefore, even if the support frame 100 is to be removed, the annular frame 111 can be retained, enabling effective support of the upper half 10a of the upper well 10.

[0066] In addition, the annular frames 11 are spaced apart from adjacent annular frames 111 to ensure easy installation while reducing the amount of material used, and a plurality of connecting frames 113 are provided between the adjacent annular frames 111 and are formed to be reinforced in the length direction.

[0067] In addition, the base 120 installed on the lower well 10 of the support frame 100 and transferring the load to the lower part can disperse and transfer the load transmitted from the connecting rod 130 through the dispersion frame 121 to the base 122, and the base 122 is arranged to at least partially contact the lower well 20.

[0068] Meanwhile, as Figures 6a to 6b shown, the side face forming step S30 can be subdivided into a lining removing step S31, a side face excavating step S32, a side face reinforcing step S33, a wall lining forming step S34, and a support frame removing step S35.

[0069] As described above, the lining removal step S31 is a step of removing the linings formed on the lower half 10b of the upper shaft 10 and the upper half 20a of the lower shaft 20. Preferably, the linings 11 of the upper shaft 10 and the lining 21 of the lower shaft 20 are made into structures that are easy to remove. According to an embodiment, brittle parts are formed on the linings 11, 21 with construction joints. That is, in the initial lining formation step S12, the permanent linings 11, 21 are only formed on the upper half 10a of the upper shaft 10 and the lower half 20b of the lower shaft 20, and the remaining lower half 10b of the upper shaft 10 and the upper half 20a of the lower shaft 20 can also be formed to be temporarily usable or recyclable.

[0070] The subsequent side face excavation step S32 is a step of excavating the lower half 10b of the upper shaft 10 and the upper half 20a of the lower shaft 20 in communication. At this time, since the upper half 10a of the upper shaft 10 is stably supported by the support frame 100, the side face 30 can be effectively formed.

[0071] Meanwhile, Figure 7 Fig. shows a multi-layer tunnel structure TM according to another embodiment of the present invention, in which the side face 30 can be formed wider than the upper shaft 10 and the lower shaft 20, and the length of the plate 40 can also be formed to the corresponding width. Therefore, different widths can be formed according to the road section to ensure the formation of an emergency passage.

[0072] The subsequent side face reinforcement step S33 is a step of reinforcement by inserting a ground beam 35 into the excavated side face 30. The above side face reinforcement step S33 can be carried out by various well-known methods, but preferably by drilling holes to insert steel pipes and injecting grouting materials for reinforcement.

[0073] The subsequent wall lining formation step S34 is a step of forming a wall lining 31 on the side face 30, connecting the linings 11, 21 remaining on the upper half 10a of the upper shaft 10 and the lower half 20b of the lower shaft 20 to form an integral lining structure.

[0074] The subsequent support frame removal step S35 is a step of removing the support frame 100 where the lining 11 formed on the upper half 10a of the upper shaft 10 is stably supported by the wall lining 31 of the wall body part 30

[0075] At this time, the ring frame 111 and the support frame 112 are formed to be able to be fastened and separated from each other, and even if the support frame 100 is removed, the ring frame 111 can be made into a truss structure, so that it can be retained for permanently supporting the upper half 10a of the upper shaft 10.

[0076] Meanwhile, the multi-layer tunnel structure MT in which the upper shaft and the lower shaft of the present invention are connected is a structure completed by the chronological characteristics of the above construction method M, and detailed descriptions of repeated content are omitted. In addition, the multi-layer tunnel structure MT of the present invention can ensure the same structural characteristics and construction advantages as the above construction method.

[0077] According to one embodiment, the upper shaft 10 and the lower shaft 20 with a circular cross-section are drilled adjacent to each other by a tunneling machine, so that linings 11 and 21 are respectively formed on the inner circumferential surfaces of the upper shaft 10 and the lower shaft 20.

[0078] In addition, a support frame 100 is provided to penetrate between the upper shaft 10 and the lower shaft 20, and in a state where the upper shaft 10 is supported, the lower half 10b of the upper shaft 10 and the upper half 20a of the lower shaft 20 are excavated to communicate with each other, so that a side surface part 30 with an up-and-down straight line is formed, and then the support frame 100 is removed, so that a wall lining 31 is formed on the side surface part 30 and extends to the linings 11 and 21.

[0079] At least one plate 40 is formed on the side surface part 30 to separate the upper layer and the lower layer, thereby completing the multi-layer tunnel structure MT of the present invention.

[0080] At this time, in the plate 40, a main plate 41 is formed to connect both sides of the side surface part 30, and a lower plate 42 is formed to connect the lower half 20b of the lower shaft 20, so that a facility space PS can be provided at the bottom of the lower plate 42.

[0081] For the above multi-layer tunnel structure MT in which the upper shaft and the lower shaft are connected and its construction method M, those of ordinary skill in the technical field to which the present invention pertains can understand that without changing the technical idea or essential characteristics of the present invention, it can be implemented in other specific forms.

[0082] Therefore, the embodiments described above are exemplary in all aspects and not restrictive, and the scope of the present invention is represented by the scope of the patent claims described later rather than the foregoing detailed description, and any changes or modifications resulting from the meaning and scope of the patent claims and equivalent concepts should be construed as being included within the scope of the present invention.

[0083] Industrial Applicability

[0084] Underground transportation means including subways rarely interfere with surface traffic or pedestrians and move quickly. Highways are a useful transportation facility. However, if overpasses are installed underground in the city center and built, they will occupy a large area. Therefore, it is difficult to install a large number of overpasses in the narrow city center. However, when using the mezzanine tunnel of the present invention, all left turns only need to rotate 90 degrees like right turns instead of 270 degrees. Therefore, the connecting lights of the overpass have a larger turning radius, but the size of the overpass is reduced by more than 10 times, and the overpass can be installed anywhere as needed. In addition, taking advantage of the characteristics of small intersections and large turning radii, the capacity of transportation means that can operate continuously at high frequencies like highways can be more than twice that of subways, and the speed can be more than three times that of subways.

[0085] Let vehicles traveling in opposite directions be on the upper and lower layers of the middle tunnel respectively. No matter whether they are assigned to the left or right, they can directly bifurcate or converge, enabling vehicles converging at multiple locations in the city center to travel at high frequencies and also having a useful structure that can bifurcate to multiple locations. The middle tunnel is necessary for setting up small intersections underground in the narrow existing city center. The above method of excavating with a circular tunneling machine, connecting the upper well and the lower well, and forming a slab is faster and more effective than the existing tunnel excavation methods. In addition, the cross-section of the completed tunnel is easy to design to minimize the unnecessary space for vehicles to travel on the two-layer road.

Claims

1. A construction method for a multi-layer tunnel structure with an upper shaft connected to a lower shaft, characterized in that, Comprising: Up-and-down well forming step (S10), using a roadheader to drill adjacent circular-sectioned upper well (10) and lower well (20); Support frame installation step (S20), the support frame (100) is installed to pass between the upper well (10) and the lower well (20), the bottom of the support frame (100) is located on the lower well (20), and the top supports the upper well (10); Side face forming step (S30), except for the upper half (10a) of the upper well (10) and the lower half (20b) of the lower well (20), excavating the lower half (10b) of the upper well (10) and the upper half (20a) of the lower well (20) to communicate with each other to form a side face (30); and Plate forming step (S40), forming at least one plate (40) on the side face (30) to separate the upper layer and the lower layer.

2. The construction method for a multi-layer tunnel structure with an upper shaft connected to a lower shaft according to claim 1, characterized in that, The up-and-down well forming step (S10) includes: Up-and-down well drilling step (S11), for drilling the upper well (10) and the lower well (20); and Lining forming step (S12), forming linings (11, 21) on the inner circumferential surfaces of the upper well (10) and the lower well (20) respectively.

3. The construction method for a multi-layer tunnel structure with an upper shaft connected to a lower shaft according to claim 1, characterized in that, The side face forming step (S30) includes: Side face excavation step (S32), excavating the lower half (10b) of the upper well (10) and the upper half (20a) of the lower well (20) to communicate with each other; Wall lining forming step (S34), forming a wall lining (31) on the side face (30); and Support frame removal step (S35), for removing the support frame (100).

4. The construction method for a multi-layer tunnel structure with an upper shaft connected to a lower shaft according to claim 3, characterized in that, The side face forming step (S30) further includes: Lining removal step (S31), removing the linings formed on the lower half (10b) of the upper well (10) and the upper half (20a) of the lower well (20).

5. The construction method for a multi-layer tunnel structure with an upper shaft connected to a lower shaft according to claim 3, characterized in that, The side face forming step (S30) further includes: Side face reinforcement step (S33), reinforcing by inserting a ground beam (35) into the excavated side face (30).

6. The construction method for a multi-layer tunnel structure with an upper shaft connected to a lower shaft according to claim 1, characterized in that, The plate forming step (S40) includes: Main plate forming step (S41), for connecting both sides of the side face (30) to form a main plate (41); and Lower plate forming step (S42), for connecting the lower half (20b) of the lower well (20) to form a lower plate (42).

7. The construction method for a multi-layer tunnel structure with an upper shaft connected to a lower shaft according to claim 1, characterized in that, The top of the support frame (100) is formed with a support portion (110) for supporting the upper well (10), and the bottom is formed with a base portion (120) installed on the lower well (20), and the support portion (110) and the base portion (120) are assembled into one body by a connecting rod (130).

8. The construction method for a multi-layer tunnel structure with an upper shaft connected to a lower shaft according to claim 7, characterized in that, The support portion (110) has an annular frame (111) for supporting the upper well (10), and the annular frame transmits the load to the connecting rod (130) through a support frame (112), and the base portion (120) transmits the load received from the connecting rod (130) to the base portion (122), and the base portion (122) is arranged to contact the lower well (20).

9. A multi-layer tunnel structure with an upper shaft connected to a lower shaft, as a multi-layer tunnel structure utilizing an upper shaft (10) and a lower shaft (20) that are perforated close to a circular cross-section, characterized in that, The upper half (10a) of the upper well (10) and the lower half (20b) of the lower well (20) are excavated to be connected, forming a side surface part (30) that is straight up and down. Linings (11, 21) are formed in the upper half (10a) of the upper well (10) and the lower half (20b) of the lower well (20). A wall body lining (31) that extends to the linings (11, 21) is formed in the side surface part (30). At least one plate (40) is formed in the side surface part (30) to separate the upper layer and the lower layer.

10. The multi-layer tunnel structure with the upper well connected to the lower well according to claim 9, characterized in that, A main plate (41) is formed in the plate (40). The main plate (41) is formed to connect both sides of the side surface part (30). A lower plate (42) is formed to connect the lower half (20b) of the lower well (20). A facility space (PS) is provided at the bottom of the lower plate (42).

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