System for installing internal pipes inside existing tunnels

Abstract

To provide an inner pipe installation system and an inner pipe installation method within an existing tunnel capable of efficiently installing an inner pipe within the existing tunnel.SOLUTION: An inner pipe installation system 70 within an existing tunnel, for installing an inner pipe 20B within an existing tunnel 10 extending from a vertical shaft 10A by connecting a plurality of separated inner pipes 20, comprises a base-pushing jack 30 placed in the vertical shaft 10A to push out a plurality of separated inner pipes 20 introduced in the vertical shaft 10A, and a gable frame body 50 for sealing gaps 15 at gable parts of a plurality of filling section arranged in a longitudinal direction of the existing tunnel 10 when filling filler 90 in the gaps 15 between an inner peripheral surface of the existing tunnel 10 and an outer peripheral surface of the separated inner pipes 20.SELECTED DRAWING: Figure 6

Description

Technical Field

[0004]

[0001] The present invention relates to an inner pipe installation system inside an existing tunnel. Mu It is related to.

Background Art

[0002] As a reinforcement measure against the aging of an already constructed existing tunnel, or as a measure for using the existing tunnel for other purposes, an inner pipe may be installed inside the existing tunnel. As an example, in a nuclear power generation facility, by installing an inner pipe inside an already constructed existing tunnel used as a seawater intake channel, a new intake channel with excellent seismic resistance and high safety can be constructed, and the like can be cited. However, since the construction examples of installing an inner pipe inside an existing tunnel are extremely few and the demands for it are also few, the technology for efficiently installing an inner pipe has not been established at present.

[0003] Here, in Patent Document 1, an inner pipe reduced in diameter to form a predetermined gap with the inner wall of a buried and aging pipe underground is formed of segments divided in the circumferential direction and the longitudinal direction, a plurality of segments are carried into the pipe, and after assembling the inner pipe by joining the plurality of segments in the circumferential direction and the longitudinal direction, a filler such as mortar is filled in the gap between the inner pipe and the pipe, and a method for repairing and regenerating a buried pipe has been proposed. In this repair and regeneration method, it is assumed that the segments are carried into the buried pipe from a manhole using the manhole of the buried pipe.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The repair and restoration method for underground buried pipes described in Patent Document 1 involves transporting segments into the buried pipe from a manhole, but it does not specifically show how the segments are transported inside the pipe and assembled into the inner pipe after they have been transported. In the installation of inner pipes inside existing tunnels, how the inner pipes are transported inside the existing tunnel, and furthermore, how the gap between the existing tunnel and the inner pipes is filled with filler material, are extremely important factors that determine the overall construction period, yet Patent Document 1 does not provide specific information on the transport method, which is one of the important factors.

[0006] This invention provides a system for installing internal pipes inside existing tunnels, enabling efficient installation of internal pipes within existing tunnels. Mu The purpose is to provide it. [Means for solving the problem]

[0007] To achieve the above objective, one embodiment of the internal pipe installation system for existing tunnels according to the present invention is: This is an internal pipe installation system for existing tunnels, in which multiple segmented internal pipes are connected to install the internal pipes inside the existing tunnel extending from a shaft. A push jack is installed in the shaft and pushes out the multiple divided inner pipes that have been brought into the shaft, The present invention is characterized by having an end frame that closes the gap at the end of a plurality of filling sections provided in the longitudinal direction of the existing tunnel when filling the gap between the inner surface of the existing tunnel and the outer surface of the divided inner pipe with a filling material.

[0008] According to this embodiment, by sequentially pushing out multiple segmented internal pipes that have been brought into the shaft using a main-pushing jack installed in the shaft, efficient transport of segmented internal pipes within the existing tunnel can be achieved, and an internal pipe consisting of multiple segmented internal pipes connected together can be installed inside the existing tunnel. Furthermore, when filling the gap between the inner surface of the existing tunnel and the outer surface of the divided inner pipe with filler material, by providing multiple filling sections in the longitudinal direction of the existing tunnel and closing the gap at the end of each filling section with a end frame, it becomes possible to fill the gap between the existing tunnel and the inner pipe (divided inner pipe) with filler material. Moreover, even if the existing tunnel is long, by filling the filler material in each filling section, it becomes possible to efficiently and reliably fill the entire length of the existing tunnel with filler material. Unlike conventional tunneling methods that propel box structures into the ground, this embodiment is a system that pushes out (propels) segmented internal pipes using a main-pull jack inside an existing tunnel, and is a novel pushing system that has not existed before.

[0009] Here, the "existing tunnels" in which the internal pipes are installed include various types of tunnels, such as shield tunnels formed by various segments including steel segments under the shield method, tunnel jacking tunnels constructed by the tunnel jacking method, mountain tunnels constructed by the NATM (New Austrian Tunneling Method), and primary linings made of reinforced concrete. Furthermore, if there are sections of bedrock and sections of relatively soft ground along the length of the existing tunnel, tunnels that have both mountain tunnel sections and shield tunnel sections are also included. Furthermore, the divided inner pipes may include precast pipes (Hume pipes) made of reinforced concrete, and these precast pipes may have inserts embedded in them for installing various ancillary equipment inside the divided inner pipes. Furthermore, mortar, cement, or similar materials are used to fill the gap between the inner surface of the existing tunnel and the outer surface of the divided inner pipe.

[0010] Furthermore, another embodiment of the internal pipe installation system for existing tunnels according to the present invention is: The present invention is characterized by further having guide rails laid within the existing tunnel for guiding the divided inner pipes.

[0011] According to this embodiment, guide rails for guiding the segmented internal pipes are laid within the existing tunnel, allowing the segmented internal pipes to be efficiently pushed out. Furthermore, by guiding each segmented internal pipe with the guide rails, it becomes possible to precisely position and install each segmented internal pipe at its design location within the existing tunnel. For example, the guide rails can be used to align the cross-sectional center of the segmented internal pipe with the cross-sectional design center of the existing tunnel.

[0012] For example, one configuration involves installing two guide rails extending in the longitudinal direction of an existing tunnel on an invert that is constructed later below an existing tunnel with a circular or horseshoe-shaped cross-section, and using these two guide rails to stably guide each section of the inner pipe. Here, the guide rails can be formed from shaped steel materials such as H-beams or channel steel.

[0013] Furthermore, another embodiment of the internal pipe installation system for existing tunnels according to the present invention is: The guide rail is characterized in that a friction-reducing material is provided on the upper surface with which the divided inner tube slides.

[0014] According to this embodiment, by providing a friction-reducing material on the upper surface of the guide rail, the dynamic friction force between the divided inner tube, which is pushed out while sliding against the guide rail, and the guide rail can be reduced, thereby enabling more efficient pushing out of the divided inner tube.

[0015] Furthermore, another embodiment of the internal pipe installation system for existing tunnels according to the present invention is: The invention further features a tip-pushing jack that is fixed to both the front group of divided inner tubes corresponding to the filling section and the rear group of divided inner tubes among the multiple divided inner tubes, and that takes a reaction force from the rear group of divided inner tubes to push out the front group of divided inner tubes.

[0016] According to this aspect, after pushing out all the divided inner pipes to a predetermined position in the front by a forward pressing jack, when sequentially pushing out a part of them to a predetermined installation position (design position) as a forward divided inner pipe group corresponding to the filling section, by further having a tip pushing jack that executes the pushing out of this forward divided inner pipe group by taking a reaction force from the rear divided inner pipe group, efficient pushing out of the divided inner pipe group can be realized. For example, when the number of all the divided inner pipes is 100, after pushing out 100 divided inner pipes to the front of a predetermined installation position by a forward pressing jack, about 10 divided inner pipes can be pushed out as a divided inner pipe group by a tip pushing jack. By pushing out this divided inner pipe group, a space corresponding to the pushing out amount is formed between the pushed-out forward divided inner pipe group (for example, 10 divided inner pipes) and the rear divided inner pipe group (for example, 90 divided inner pipes). It becomes possible to install a filling facility for the filling material in this space and install a wife frame body behind the divided inner pipe group pushed out using this space. Alternatively, a wife frame body may be installed in this space.

[0017] Also, another aspect of the inner pipe installation system into an existing tunnel according to the present invention is characterized in that an angular notch prevention material is provided on the ring joint surface of the divided inner pipe.

[0018] According to this aspect, since an angular notch prevention material is provided on the ring joint surface of the divided inner pipe, angular notch on the ring joint surface of a plurality of divided inner pipes pushed out while pressing against each other at the ring joint surface can be effectively prevented.

[0019] Also, in another aspect of the inner pipe installation system into an existing tunnel according to the present invention, the wife frame body is formed by a U-shaped hollow sheet, the interior of the hollow sheet is filled with a fluid and swells, and the ends of the hollow sheet are connected to each other above.

[0020] According to this aspect, the wife frame body is formed by a U-shaped hollow sheet, and the inside of the hollow sheet is filled with a fluid (such as air or water) and swells, and the ends of the hollow sheets are connected above and used. For example, the attachment property of the wife frame body to the gap between the inner peripheral surface of an existing tunnel with a circular cross-section and the outer peripheral surface of a divided inner pipe with a circular cross-section is improved, and the blocking property of the annular gap is also improved. Here, when the existing tunnel is formed by steel segments, by installing the hollow sheet so as to straddle the main girders of the steel segments extending in the circumferential direction, the blocking property of the gap in the wife part is further improved.

[0021] Also, one aspect of the method for installing an inner pipe inside an existing tunnel according to the present invention is an inner pipe installation method for installing an inner pipe by connecting a plurality of divided inner pipes inside an existing tunnel extending from a shaft, comprising: a step A of sequentially pushing out the plurality of divided inner pipes carried into the shaft by a pushing jack installed in the shaft, and stopping a divided inner pipe group formed by the plurality of divided inner pipes at a predetermined length behind a predetermined installation position inside the existing tunnel; a step B of pushing out the predetermined length of a divided inner pipe group composed of a plurality of the divided inner pipes in the front by taking a reaction force from a divided inner pipe group composed of a plurality of the divided inner pipes in the rear; a step C of installing a filling material filling facility in the space formed by the pushing out, installing a wife frame body behind the divided inner pipe group pushed out using the space, and filling a filling material into a part or all of the gap between the outer peripheral surface of the pushed out divided inner pipe group and the inner peripheral surface of the existing tunnel as a gap in the filling section; characterized in that the steps B and C are set as a set, and the set is repeated to install the inner pipe.

[0022] According to this embodiment, a main jack sequentially pushes out multiple divided internal pipes, stopping the group of divided internal pipes, consisting of all divided internal pipes, a predetermined length behind the predetermined installation position (design position). A space is created by pushing out some of the divided internal pipes by a predetermined length, and a filling facility for the filling material is installed in that space. A end frame is then installed behind the group of divided internal pipes that have been pushed out, and a filling material is filled into part or all of the gap in the filling section between the pushed-out group of divided internal pipes and the existing tunnel. By repeatedly pushing out the group of divided internal pipes and filling the gap in the filling section with the filling material, a series of construction steps, from transporting the divided internal pipes to filling the gap with the filling material, can be efficiently carried out. Here, "filling part or all of the gap in the filling section with filler" includes both filling all of the gap in the filling section with filler and filling only a part of the gap in the previously formed filling section (for example, only the lower or upper half). For example, if filler is continuously filled into the upper half of the gap in the previously formed filling section and the lower half of the gap in the subsequently formed filling section, then, in terms of filling a single filling section, this would be considered "filling only a part of the filling section with filler."

[0023] Furthermore, in another embodiment of the method for installing internal pipes inside an existing tunnel according to the present invention, In step C, the filling of the gap in the filling section is divided into filling the lower half of the gap and filling the upper half of the gap. The method is characterized by performing the filling of the gap in the lower half of the rearward-facing filling section formed later and the filling of the gap in the upper half of the frontward-facing filling section formed earlier as a set.

[0024] According to this embodiment, the filling of the gap in the filling section is divided into filling the lower half of the gap and filling the upper half of the gap, and by filling the gap in the lower half of the rear filling section formed later and the gap in the upper half of the front filling section formed earlier as a set, efficient filling of the gap can be achieved. Furthermore, for the first filling section, only the lower half of the gap will be filled with filler material. After that, as described above, the upper half of the gap in the preceding filling section and the lower half of the gap in the subsequent filling section will be continuously filled with filler material. [Effects of the Invention]

[0025] The present invention relates to a system for installing internal pipes inside existing tunnels. Mu According to this, internal pipes can be efficiently installed inside existing tunnels. [Brief explanation of the drawing]

[0026] [Figure 1] This is a process diagram illustrating an example of an internal pipe installation method according to an embodiment, and is a diagram illustrating process A. [Figure 2] This is a perspective view showing the area around the main push jack that constitutes the internal pipe installation system according to the embodiment. [Figure 3] This is a view along the line III-III in Figure 1, which is a longitudinal cross-sectional view perpendicular to the tunnel axis, showing the ring joint surface of the divided inner pipe from the front. [Figure 4] This diagram shows the state in which the segmented inner tube is in sliding contact with the friction-reducing material on the guide rail. [Figure 5] Following Figure 1, this is a process diagram illustrating an example of an internal pipe installation method according to an embodiment, and further details process A. [Figure 6] Following Figure 5, this is a process diagram illustrating an example of an internal pipe installation method according to the embodiment, explaining steps B and C, and showing an example of an internal pipe installation system according to the embodiment. [Figure 7] This figure shows the front section of the internal pipes being pushed out by a tip-pull jack. [Figure 8] This diagram provides a detailed explanation of process C in the first filling section. [Figure 9] This diagram shows a liner plate interposed between the divided inner tube and the invert. [Figure 10]This diagram shows the end frame being installed so as to straddle the main girders of the steel segments that make up the existing tunnel. [Figure 11] Following Figure 8 is a process diagram of an example of the internal pipe installation method according to the embodiment. [Figure 12] This diagram provides a detailed explanation of step C in the second filling section. [Figure 13] Following Figure 12 is a process diagram of an example of an internal pipe installation method according to the embodiment. [Figure 14] Following Figure 13, the next diagram shows an example of an internal pipe installation method according to the embodiment. [Modes for carrying out the invention]

[0027] The internal pipe installation system and internal pipe installation method for existing tunnels according to the embodiment will be described below with reference to the attached drawings. In this specification and drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[0028] [Internal pipe installation system and internal pipe installation method according to the embodiment] An example of an internal pipe installation system and internal pipe installation method according to an embodiment will be described with reference to Figures 1 to 14. Here, Figures 1 and 5 are process diagrams of an example of an internal pipe installation method according to the embodiment, illustrating process A; Figure 6, following Figure 5, is a process diagram of an example of an internal pipe installation method according to the embodiment, illustrating processes B and C, and shows an example of an internal pipe installation system according to the embodiment. Furthermore, Figure 8 is a diagram that explains process C in the first filling section in detail; Figure 11, following Figure 8, is a process diagram of an example of an internal pipe installation method according to the embodiment; Figure 12 is a diagram that explains process C in the second filling section in detail; and Figures 13 and 14, following Figure 12, are process diagrams of an example of an internal pipe installation method according to the embodiment.

[0029] The existing tunnel 10, in which the internal pipe is installed, is a hybrid tunnel structure comprising a NATM tunnel section and a shield tunnel section constructed on bedrock ground G, with a cast-in-place lining section at the tip of the shield tunnel section. The illustrated example shows the formation of a new water intake channel with excellent seismic resistance and high safety inside the existing tunnel 10 using the internal pipe installation method according to the embodiment.

[0030] Furthermore, the existing tunnel 10 in the illustrated example is a tunnel with a straight longitudinal profile and a predetermined gradient (a few percent gradient). Therefore, the divided internal pipe group can be positioned at a predetermined design location by being pushed out (propelled) from the rear. It should be noted that there are other tunnels with various specifications, and the internal pipes installed inside may be used for various other purposes.

[0031] As shown in Figure 1, the existing tunnel 10 extends in one direction from the shaft 10A at a predetermined gradient. Below the interior of this existing tunnel 10, an invert 18 is constructed when installing the inner pipe.

[0032] A push jack 30, which constitutes the internal pipe installation system according to the embodiment, is installed in the shaft 10A. The divided internal pipes 20 are sequentially lowered from the ground in the X1 direction via the shaft 10A. The multiple divided internal pipes 20 brought into the shaft 10A are sequentially pushed out in the X2 direction toward the leading edge of the shield tunnel section by the push jack 30.

[0033] As shown in Figure 2, a frame 31 is assembled in the shaft 10A using H-shaped steel or other shaped steel materials, a push angle 32 is erected on the frame 31, and two main push jacks 30 are installed in front of the push angle 32 so as to take reaction force from the push angle 32. A stopper ring 33 is installed at the tip of the rods of the two main push jacks 30, and as the rods extend, the divided inner pipe 20 is pushed out via the stopper ring 33. Note that the number of main push jacks 30 is not limited to the illustrated example, and may be four or six, for example. Also, there are various forms of frame structures, and are not limited to the illustrated example. Note that in a back truss type configuration like the illustrated example, bracing can be taken from the wall (not shown) of the shaft 10A at the rear using steel materials.

[0034] As shown in Figures 1 and 3, both the existing tunnel 10 and the divided inner pipe 20 have a circular cross-sectional shape. As shown in Figure 3, the top surface of the invert 18 is flat and constructed with the same predetermined gradient in the longitudinal direction as the existing tunnel 10, and a pair of guide rails 40 extending in the longitudinal direction of the existing tunnel 10 are installed on its left and right sides. Here, the pair of guide rails 40 are formed from H-shaped steel or the like, and a base is provided below them to tilt the upper flange of the H-shaped steel inward, so that the upper flanges of the pair of H-shaped steel 40 are both tilted inward, stably supporting and guiding the outer surface of the divided inner pipe 20 which has a circular cross-section.

[0035] Each section of inner pipe 20, pushed out by the main jack 30, moves toward the leading edge of the shield tunnel section while being guided by a pair of guide rails 40.

[0036] As shown in Figure 3, the divided inner pipe 20 has a hollow 21 inside which serves as a water channel, and a corner chipping prevention material 26 is installed on the ring joint surface 25 at the end. Here, a cushioning material such as a pulping ring can be applied to the corner chipping prevention material 26. In addition, an endless shape sealing material 27 (for example, a water-expandable shape sealing material) is further provided on the outer edge of the corner chipping prevention material 26 to ensure watertightness between the ring joint surface of the adjacent divided inner pipe.

[0037] By providing a corner chipping prevention material 26 on the ring joint surface 25 of the divided inner pipe 20, corner chipping of the ring joint surface 25 of the multiple divided inner pipes 20 that are pushed out while pressing against each other at the ring joint surface 25 can be effectively prevented.

[0038] Here, the inner pipe 20B (see Figure 5, etc.) formed by multiple divided inner pipes 20 has a structure in which the ring joint surfaces 25 of adjacent divided inner pipes 20 are not connected by bolts or the like, but are instead in contact with each other under pressure, in order to improve its axial seismic resistance.

[0039] A pair of guide rails 40 create an annular gap 15 between the inner surface of the existing tunnel 10 and the outer surface of the divided inner pipe 20. In other words, in addition to being a member that guides the movement of the divided inner pipe 20 inside the existing tunnel 10, the guide rails 40 can form a gap 15 of equal width in the circumferential direction between them and the inner surface of the existing tunnel 10. To put it another way, even if the existing tunnel 10, which is a shield tunnel, is meandering and deviates from the design position, it is possible to install the divided inner pipe 20 in the design position by constructing the invert 18 at a height such that the divided inner pipe 20 is aligned to the design height, and by adjusting the pair of guide rails 40 to the left and right so that the divided inner pipe 20 is positioned at the design position.

[0040] Therefore, when each divided inner pipe 20 is aligned to a predetermined installation position along the pair of guide rails 40, a gap 15 with a uniform width in the circumferential direction is formed. However, if the divided inner pipe 20 is actually in the design position and the existing tunnel 10 is meandering, the width of the gap 15 is unlikely to be uniform in the circumferential direction. As shown in Figure 3, the annular gap 15 can be formally divided into an upper half above the spring line of the existing tunnel 10 and a lower half below it, and in the filling of the filler material described below, the filling of the upper half and the filling of the lower half are carried out separately.

[0041] As shown in Figure 4, a friction-reducing material 45 is attached to the upper surface of the guide rail 40. Here, the friction-reducing material 45 can be a sheet or plate made of fluororesin such as PTFE (polytetrafluoroethylene), and examples include Nafuron® PTFE sheet and Teflon® PTFE sheet.

[0042] By attaching the friction-reducing material 45 to the upper surface of the guide rail 40, the dynamic friction force between the divided inner tube 20, which is pushed out while sliding against the guide rail 40, and the guide rail 40 can be reduced, enabling more efficient pushing out of the divided inner tube 20.

[0043] The width t1 of the divided inner pipe 20 (see Figure 1) can be set to a range of 1 m to several m, for example, it can be set to 2 m. The cross-sectional dimensions of the divided inner pipe 20 can be set to an outer diameter of approximately 1 m to several m, for example, a divided inner pipe with a hollow 21 of approximately 1.5 m in diameter can be used for an outer diameter of approximately 2.5 m. Furthermore, if the cross-sectional dimensions of the existing tunnel 10 are approximately several m in outer diameter, for example, approximately 4 m, a gap 15 with a width of approximately 500 mm will be formed between the inner circumferential surface of the existing tunnel 10 and the outer circumferential surface of the divided inner pipe 20.

[0044] As shown in Figure 1, the segmented inner pipes 20 brought into the shaft 10A are sequentially joined together, and the group of segmented inner pipes 20A, consisting of multiple segmented inner pipes 20, moves along a pair of guide rails 40 on an invert 18 that is straight and has a predetermined gradient. As shown in Figure 2, the inner pipe 20B, formed by all the segmented inner pipes 20 installed inside the existing tunnel 10, is pushed out by the main jack 30 via the struts 35. Here, the total length of the inner pipe 20B can be set to approximately 100m to several hundredm, for example, to approximately 200m.

[0045] Here, the leading edge position of the shield tunnel section shown in Figure 5 is the design leading edge installation position P (an example of a predetermined installation position) where the leading edge of the inner pipe 20B should be installed. However, in this case, the leading edge of the inner pipe 20B is stopped a predetermined length t2 behind the design leading edge installation position P.

[0046] Here, the predetermined length t2 corresponds to the width of the space formed inside the inner pipe 20B, as will be explained below. In the inner pipe installation method, this space is used to install various equipment for filling the packing material and to install the end frame, so the predetermined length t2 is set to the width required for the space (the series of constructions shown in Figures 1 and 5 are collectively referred to as process A).

[0047] Next, as shown in Figure 6, the group of divided inner tubes 20C, consisting of multiple divided inner tubes 20 located at the front (eight in the illustrated example), is pushed forward by a predetermined length t2 in the X3 direction by the tip push jack 60, taking a reaction force from the group of divided inner tubes 20D, consisting of multiple divided inner tubes 20 located at the rear (approximately 100 in total minus the eight at the front), thereby forming a space S between the group of divided inner tubes 20C at the front and the group of divided inner tubes 20D at the rear (Step B).

[0048] As shown in Figure 7, two guide members 64 are installed so as to straddle the interior of both the frontmost segmented inner tube 20 of the rear segmented inner tube group 20D and the rearmost segmented inner tube 20 of the front segmented inner tube group 20C. A tip-pushing jack 60 is installed in the frontmost segmented inner tube 20 of the rear segmented inner tube group 20D so that the rod moves back and forth inside the two guide members 64. On the other hand, a push-in block member 65 is provided inside the two guide members 64 in the rearmost segmented inner tube 20 of the front segmented inner tube group 20C.

[0049] The pair of end-pull jacks 60 push the pair of insert material 65 in the X3 direction, causing the end-pull jacks 60 to take a reaction force from the rear segmented inner tube group 20D and push out the front segmented inner tube group 20C.

[0050] Returning to Figure 6, the formed space S is used to install the end frame 50 on the rear side of the front divided inner pipe group 20C, and the end frame 50 is used to close the gap at the end while filling with the filler material 90A (Step C). As shown in Figure 6, the initially extruded divided inner pipe group 20C is installed in the position where each divided inner pipe 20 should be installed inside the existing tunnel 10, and the gap 15 between this divided inner pipe group 20C and the existing tunnel 10 becomes the first filling section.

[0051] As shown in Figure 6, the internal pipe installation system 70 is formed by the main push jack 30 located inside the shaft 10A, the end frame 50, and the tip push jack 60.

[0052] Figure 8 is a diagram illustrating step C in the first filling section in detail. The length t3 of the first filling section is the total width of the eight divided inner pipes 20 in the illustrated example. A filling pipe 81, through which the filling material is transported, extends from the front group of divided inner pipes 20C to the rear group of divided inner pipes 20D. A work platform 88 (an example of filling equipment) is installed in space S, and a frame 50 is installed around the last divided inner pipe 20 of the front group of divided inner pipes 20C using space S.

[0053] As shown in Figure 9, the lower part of the divided inner tube 20 is supported by a pair of guide rails 40, but the stability of the divided inner tube 20 is ensured by fitting multiple liner plates 86 between it and the invert 18 at the lowest end.

[0054] The end frame 50 is formed from a U-shaped hollow sheet, and a fluid such as mortar is filled inside the hollow sheet, causing it to expand and the ends of the hollow sheet to connect at the top.

[0055] In this way, the end frame 50 is formed from a U-shaped hollow sheet, and when the inside of the hollow sheet is filled with fluid and expands, the ends of the hollow sheet are connected at the top and used in this manner, which improves the ease with which the end frame 50 can be attached to the gap 15 between the inner surface of the existing tunnel 10 with a circular cross-section and the outer surface of the divided inner pipe 20 with a circular cross-section, and also improves the ability to close the annular gap 15.

[0056] More specifically regarding the installation of the end frame 50, as shown in Figure 10, the end frame 50 is installed so as to straddle the main girders 12 that extend in the circumferential direction and are provided by the steel segments 11 that form the existing tunnel 10. By installing the end frame 50 so as to straddle the main girders 12 in this way, the ability to close the gaps 15 at the end is further improved.

[0057] Returning to Figure 8, a buoyancy support material 85 is interposed between the upper part of the end frame 50 and the existing tunnel 10, and measures are taken to prevent the end frame 50 from floating up due to the filled material.

[0058] The filling pipe 81 splits into two branches behind the end frame 50. One branch has a filling nozzle 83A that penetrates the end frame 50, and the other branch has a filling nozzle 83B located at the front end of the first filling section. A valve 82 is provided on the filling nozzle 83B, and an air vent pipe 84 is installed nearby. While removing air from the gap 15 in the first filling section via the air vent pipe 84, a filling material such as mortar is filled from the two filling nozzles 83A and 83B.

[0059] In the illustrated example of the internal pipe installation method, first, only the lower half of the gap 15 in the first filling section is filled with filler material 90A (lower half filler material).

[0060] Next, as shown in Figure 11, the following eight divided internal tubes 20 are designated as a new front divided internal tube group 20C, and the group of divided internal tubes behind them is designated as a new rear divided internal tube group 20D. Then, using the tip push-out jack 60, the front divided internal tube group 20C is pushed forward in the X4 direction using the method already described. This push-out creates a new space S between the front divided internal tube group 20C and the rear divided internal tube group 20D.

[0061] As shown in Figure 11 and Figure 12, which provides a detailed explanation of step C in the second filling section, the filling material 90B is continuously applied to the upper half of the gap 15 that is not filled with filling material in the first filling section, and the filling material 90A is continuously applied to the lower half of the gap 15 in the second filling section.

[0062] In this way, the filling of the gap 15 in the lower half of the rear filling section formed later and the gap 15 in the upper half of the front filling section formed earlier are performed as a set, and this is repeated together with the extrusion of the divided inner pipe group 20C by multiple (eight in the illustrated example) divided inner pipes 20, thereby completing the extrusion of the inner pipes 20B and the filling of the gap 15 in the shield tunnel section, as shown in Figure 13.

[0063] As shown in Figure 13, in the NATM tunnel section, the tapered pipe 20E installed at the end is pushed out from the shaft 10A using the tip push jack 60, and a gap R is provided between it and the inner pipe 20B. This gap R is a space to accommodate the length extension of the long inner pipe 20B.

[0064] As shown in Figure 14, the gap R is closed by a cast-in-place lining 20F, which is constructed by pouring concrete on site. Next, the gaps around the inner pipe 20B, cast-in-place lining 20F, and tapered pipe 20E in the NATM tunnel section are closed with MMR (Man-made rock) 90C, thereby completing the installation of the inner pipe 20B into the existing tunnel 10.

[0065] According to the internal pipe installation method using the internal pipe installation system 70 shown in the figure, a main push jack 30 sequentially pushes out multiple divided internal pipes 20, stopping the divided internal pipe group 20B consisting of all divided internal pipes 20 at a predetermined length t2 behind the predetermined installation position, and a filling facility for the filling material 90 is installed in the space S formed by pushing out some of the divided internal pipes 20 by a predetermined length. A end frame 50 is then installed behind the divided internal pipe group 20C that was pushed out using space S, and the filling material 90 is filled into part or all of the gap 15 of the filling section between the pushed-out divided internal pipe group 20C and the existing tunnel 10. By repeatedly pushing out the divided internal pipe group 20C and filling the gap 15 of the filling section with the filling material 90, it becomes possible to efficiently carry out a series of construction work from the transport of the divided internal pipes 20 to the filling of the gap 15 with the filling material 90.

[0066] Furthermore, other embodiments may be used in which other components are combined with the configurations listed in the above embodiments, and the present invention is not limited in any way to the configurations shown herein. In this regard, modifications can be made without departing from the spirit of the present invention, and can be appropriately determined according to the application form. [Explanation of Symbols]

[0067] 10: Existing tunnels 10A: Shaft 11: Steel segment 12: Main girder 13: Vertical Ribs 15: Gap 18: Invert 20: Split inner tube 20A: Divided inner pipe group 20B: Inner tube (divided inner tube group) 20C: Front section of internal tubes (section of internal tubes) 20D: Rear section of internal pipes (section of internal pipes) 20E: Tapered tube 20F: Cast-in-place lining 21:Hollow 25: Ring joint surface 26: Corner chipping prevention material 27: Sealant 30: Main push jack 31: Frame 32: Push angle 33: Arrowhead 35: Strut 40: Guide rail (H-shaped steel) 45: Friction-reducing material 50: Wife frame body 60: Push-out jack 64: Guide material 65: Material to be pressed into place 70: Internal piping installation system 81: Filling piping 82: Valve 83A, 83B: Filling cylinder tip 84: Air vent pipe 85: Buoyancy support material 86: Liner Plate 88: Work scaffolding (filling equipment) 90: Filling material 90A: Lower half filler (filler) 90B: Upper half filler (filler) 90C:MMR G: Ground P: Design tip installation position S: Space R: Separation

Claims

1. This is an internal pipe installation system for existing tunnels, in which multiple segmented internal pipes are connected to install the internal pipes inside the existing tunnel extending from a shaft. A push jack is installed in the shaft and pushes out the multiple divided inner pipes that have been brought into the shaft, When filling the gap between the inner surface of the existing tunnel and the outer surface of the divided inner pipe with a filler material, the system includes an end frame that closes the gap at the end of a plurality of filling sections provided in the longitudinal direction of the existing tunnel. An internal pipe installation system for an existing tunnel, characterized in that the end frame further has a filling pipe that branches into two on the side opposite to the filling section to which the filling material is to be filled, one of the two-branched filling pipes penetrates the end frame and is equipped with one filling nozzle positioned at one end of the filling section, the other two-branched filling pipe penetrates the end frame and is equipped with another filling nozzle positioned at the other end of the filling section, an air vent pipe is installed near the other nozzle, and the filling material is to be filled into the filling section from the one filling nozzle and the other nozzle while the air in the filling section is vented by the air vent pipe.

2. The internal pipe installation system for an existing tunnel according to claim 1, further comprising guide rails laid within the existing tunnel for guiding the divided internal pipes.

3. The internal pipe installation system for an existing tunnel according to claim 2, characterized in that a friction-reducing material is provided on the upper surface of the guide rail with which the divided internal pipe slides.

4. An internal pipe installation system for the interior of an existing tunnel according to claim 1, further comprising a tip-pushing jack fixed to both the front group of internal pipes corresponding to the filling section and the rear group of internal pipes among a plurality of internal pipes, which takes a reaction force from the rear group of internal pipes to push out the front group of internal pipes.

5. The internal pipe installation system for an existing tunnel according to claim 1, characterized in that a corner chipping prevention material is provided on the ring joint surface of the divided internal pipe.

6. The end frame is formed from a U-shaped hollow sheet, the hollow sheet is filled with fluid and expands, and the ends of the hollow sheet are connected at the top, as described in claim 1, for the internal pipe installation system inside an existing tunnel.

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