JP2018109303A - Method to install or replace invert in tunnel in service - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method to replace an invert in a tunnel in service by performing integrated installation work for the high-strength and durability invert while maintaining one-side alternate traffic.SOLUTION: An invert installation/replacement method of the present invention includes the following steps for: removing a pavement alternately from each side; driving a plurality of piles on each side alternately after removing the pavement; installing a horizontal girder over a head of the pile that has been driven and installing a plurality of cover plates on the horizontal girder, alternately on each side; forming a space on each side alternately, by removing the cover plate, excavating a ground surface and removing an invert; forming the invert integrally over an entire cross-section, by installing the cover plate on a central side, removing the cover plate from both edge sides, and casting concrete on a bottom surface of the space; removing the cover plate on a side and installing the cover plate on the other side, and re-filling over the invert with a roadbed material, alternately on each side; and paving over the re-filled roadbed material with concrete.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for installing or replacing an invert without stopping traffic in an in-service tunnel through which a general vehicle passes.

In tunnels in service, there are places where the road surface is deformed due to the expansion of inflatable grounds, the strength of grounds being lowered or deteriorated, and the inverts installed at the time of tunnel construction need to be replaced. For the same reason, there is a place where an invert is required due to a change in the road surface where no invert is provided.

The cause of the road surface deformation is due to the expansion of the expansive natural ground, the decrease and deterioration of the natural ground strength, and the left and right split construction (one-side half-section construction). It is ideal to form the invert in an integral cross section, but this requires that tunnel excavation be interrupted, so when forming the invert, there are many left and right split constructions in which concrete is placed one side at a time. ing. However, this right and left divided construction has a problem that a seam is formed in the central portion and the strength is lowered. In place of placing concrete, there is also a construction method (Patent Document 1) in which curved concrete blocks are installed one side at a time and the whole is curved. In any case, however, there is a problem that the strength is low because the invert is not integrated.

Furthermore, it is thought that this is because the process at the design stage is not anticipated. For example, after placing concrete in the invert part, it takes time to cure, so when cracking is caused by external force before reaching the specified strength and the structure is weakened, or when roadbed material is backfilled on invert Since there is no clear regulation about the required compressive strength, there may be a cause due to the wheel load of the carrying-in vehicle or the load of the rolling operation.

Considering these causes, it is optimal to replace or install Invert with the entire cross section, but in order to clear the problem of traffic regulation, a method using equipment called Invert Pier (Patent Document 2) There is. If the jetty is slid to the left or right using this jetty, the road surface of the jetty is high, so depending on the size of the tunnel cross section, it may hinder securing the cross section of excavation work and securing the cross section of a general traffic vehicle due to limitations in construction There is. Moreover, if it constructs one side at a time like patent document 1 and makes it pass alternately, it can construct, without interrupting traffic, However, Inverted construction had the problem that invert could not be integrated in the whole cross section.

JP 2000-145390 A JP 2003-278498 A

The present invention improves the above problems and provides a construction method for replacing or installing a tunnel invert in service with excellent strength and durability by carrying out the entire cross-section integrated construction of the invert while maintaining one-side alternate traffic. is there.

According to claim 1 of the present invention, there is provided a method for installing an invert of a tunnel in service, the step of alternately removing the pavement on one side in the installation of the invert of the tunnel in service having a deformed road surface, and the removal of the pavement. A step of alternately placing a plurality of piles on one side, a step of installing a cross girder on the head of a pile placed on one side, and laying a plurality of lining boards alternately thereon, The process of removing the lining board, excavating the roadbed material to alternately form the space part, laying the lining board on the center side, removing the lining board on both sides, and putting the concrete on the bottom of the space part To form a new invert with a cross-section, and remove the lining plate on one side, lay the lining plate on the other side, and alternately over the invert on one side with the roadbed material It consists of a backfilling process and a process of paving the backfilled roadbed with concrete. The one in which the features.

According to claim 2 of the present invention, the method for replacing the invert of the tunnel in service includes the step of alternately removing the pavement on one side in the replacement of the invert of the tunnel in service that has deformed the road surface, A step of alternately placing a plurality of piles on one side of removing the pile, a step of installing a cross girder on the pile head that has been placed on one side, and laying a plurality of lining boards alternately thereon, Remove the lining plate on one side, excavate the roadbed material and alternately remove the existing invert to form a space, and lay the lining plate on the center side, Removing and placing concrete on the bottom of the space to form a new invert in an integrated cross-section, removing the lining plate on one side and laying the lining plate on the other side, The process of alternately backfilling the top with roadbed material and the top of the backfilled roadbed material It is characterized in that comprising a step of paved with bets.

According to claim 3 of the present invention, a method for replacing the invert of a tunnel in service includes a step of alternately removing pavement on one side in the replacement of the invert of a tunnel in service that has deformed on the road surface, A step of alternately placing a plurality of piles on one side of removing the pile, a step of installing a cross girder on the pile head that has been placed on one side, and laying a plurality of lining boards alternately thereon, Remove the lining plate on one side, excavate the roadbed material and alternately remove the existing invert to form a space, and lay the lining plate on the center side, Removing and bending sprayed concrete on the bottom of the space, placing concrete on the shotcrete to form a new invert all in one piece, and one side lining plate And lay a lining plate on the other side and A step of backfilling alternately subgrade material over the top of the backfill was subgrade material is characterized in that comprising a step of paved with concrete.

According to claim 4 of the present invention, the inverting or inversion method of the tunnel in service according to claim 1 is the bypass according to claim 1, 2 or 3 before the step of further excavating the ground and removing the central drainage groove. After the step of switching to the water channel and the step of forming the invert, the step of backfilling the road floor material, and then installing the central drainage channel and switching the bypass water channel are characterized by the above.

According to Claim 5 of the present invention, the inverting or replacing method of the tunnel in service according to Claim 1 or 2 or 3 further comprises installing a cross beam on the pile head that has been further placed, In the process of laying the lining plates alternately, the left and right cross beams are joined or contacted together, and both ends of the left and right cross beams are brought into contact with the lower ends of the arched lining concrete. It is characterized by using a cutting edge.

According to the installation method of the invert of the tunnel in service according to claim 1 according to the present invention, when the invert is newly installed in the tunnel without the invert at the time of construction, the necessary width for passing the general vehicle on the lining plate is increased. It can always be secured at the left and right and the center, and construction can be done without blocking the entire surface. In addition, compared to the split construction on the left and right, it is possible to construct a seamless invert with an entire cross-section, and because the invert is reinforced with piles such as H-shaped steel, a new invert superior in strength and durability is formed. Deformation of the road surface can be prevented over a long period of time. Moreover, it is possible to construct a long-distance section continuously and a plurality of work processes at the same time, reduce the waiting time, and construct efficiently and economically.

According to the method for replacing the invert of the tunnel in service according to claim 2 of the present invention, the method of constructing the invert 3 by omitting the construction process of shotcrete has the same effect as that of claim 1. It is done.

According to the inverting method for inverting a tunnel in service according to claim 3 according to the present invention, the existing invert is replaced, the shotcrete is applied, and the invert is formed. The bottom of the excavated space can be stabilized by increasing the strength of the tunnel at an early stage after excavation by constructing shotcrete. Further, the same effect as in the first aspect can be obtained.

In addition, according to the installation or replacement method of the invert of the tunnel in service according to claim 4, in the case of a tunnel with a central drainage channel, the removal of the central drainage channel, the installation of the bypass channel, the switching of the channel, the central drainage It is possible to drain groundwater flowing into the tunnel during construction by adding a process such as installing a ditch.

Further, according to the installation or replacement method of the invert of the tunnel in use according to claim 5, the lining concrete forming the tunnel is cut to prevent the horizontal girder from being deformed in the horizontal direction as the invert is removed. Can also serve as a flash.

In order to replace the invert of the tunnel in service according to one embodiment of the present invention, (A) shows the state where the left side pavement is removed to expose the roadbed material, and this is temporarily paved. Cross-sectional view showing, (B) is a cross-sectional view showing a state in which the roadbed material is removed by removing the right-side pavement, and the roadbed material is temporarily paved, (C) is a state in which a pile is placed on the left-side roadbed material (D) is sectional drawing which shows the state which piled up the pile in the right roadbed material. (E) is a cross-sectional view showing a state in which a horizontal girder is attached to the pile head of the left pile, and a plurality of lining plates are laid orthogonally to this, and (F) is a cross girder on the pile head of the right pile. A sectional view showing a state in which a plurality of lining plates are installed perpendicularly to the mounting, (G) is a sectional view showing a state in which a space portion is formed by excavating the left roadbed material and the existing left invert. (H) is a cross-sectional view showing a state in which a right road bed material and an existing right invert are excavated to form a space and a lining plate is laid. (I) is a cross-sectional view showing a state in which a lining plate is laid on the center side and sprayed concrete is sprayed to the entire left and right sides of the bottom surface of the space. It is sectional drawing which shows the state in which the new invert was integrally formed in all cross-sections, (K) is sectional drawing which shows the state which installed the new center drain groove on the invert, (L) is the left invert It is sectional drawing which shows the state which refilled the space part on the top with a roadbed material, and temporarily paved the top. (M) is a cross-sectional view showing a state in which the space above the invert on the right side is backfilled with roadbed material, and the top is temporarily paved. (N) is a state where the entire left and right sides are paved and an inspection road is formed. It is sectional drawing shown. It is a top view which shows the state which attached the horizontal girder to the pile head and laid the several lining board on this.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5 in the case where an existing invert is replaced and shotcrete is applied to form the invert. A detailed description will be given of the case where the invert of a tunnel in service that has deformed on the road surface is replaced. As shown in FIG. 1 (A), the tunnel 1 in service has a curved invert 3 formed integrally with the bottom of an arch-shaped lining concrete 2, and a roadbed material 4 is piled on the invert 3. A concrete pavement 6 is formed above via a roadbed material 5. A central drain groove 7 is buried under the center of the pavement 6, and an inspection path 8 is provided next to the lining concrete 2 at the right end of the pavement 6.

In this tunnel 1, first, in the first step, the pavement 6 on the left side (one side) in the figure is removed to expose the roadbed material 4, and the top is temporarily paved. At this time, the pavement 6 on the right side (the other side) in the existing drawing becomes a general vehicle lane 10 surrounded by a dashed-dotted frame and can travel.

Next, as shown in FIG. 1 (B), the pavement 6 on the right side is removed in the second step to expose the roadbed material 4, and this is temporarily paved. In this second step, the left side is the general vehicle lane 10. Thereafter, as shown in FIG. 1 (C), in the third step, a plurality of piles 12 such as H-section steel are placed at a predetermined interval on the left roadbed material 4, and the existing invert 3 is penetrated to form the ground. Drive into the mountains. The pitching interval of the piles 12 is adjusted to the pitch of the horizontal width and the vertical length of a cover plate (not shown). After this, temporarily paving with asphalt. At this time, the right temporary pavement 13 becomes the general vehicle lane 10.

Next, as shown in FIG. 1 (D), in the fourth step, a plurality of piles 12 are driven at a predetermined interval on the right roadbed material 4, and the existing invert 3 is penetrated and driven into a natural ground. After this, temporarily paving with asphalt. At this time, the left temporary pavement 13 becomes the general vehicle lane 10.

Next, as shown in FIG. 2 (E), after removing the left temporary pavement 13 in the fifth step, a cross beam 15 is attached to the pile head of the pile 12, and a plurality of lining plates 16 are orthogonal to this. Is laid as shown in FIG. At this time, the temporarily paved right side becomes a general vehicle lane 10.

Next, as shown in FIG. 2 (F), after removing the right temporary pavement 13 in the sixth step, a cross girder 15 is attached to the pile head of the pile 12, and a plurality of lining plates 16 are orthogonal to this. Lay in the same way. The left and right cross beams 15 are integrally joined or contacted, and both end portions of the left and right cross beams 15 are attached to the lower end portions of the arched lining concrete 2 so that they can also be used as cutting edges. Yes. As a result, it is possible to prevent the lining concrete 2 from being deformed in the horizontal direction as the invert 3 is removed. At this time, the left side where the lining plate 16 is laid becomes the general vehicle lane 10.

Next, as shown in FIG. 2G, in the seventh step, the left lining board 16 is removed, the roadbed material 4 is excavated, and the existing left invert 3 and the central drainage groove 7 are removed to remove the space portion. 19 is formed. Before removing the central drain groove 7, a pump is installed in the kettle, a bypass water channel 17 is provided on the wall surface of the lining concrete 2, and groundwater is switched to the bypass water channel 17 to flow. At this time, the right side on which the lining plate 16 is laid becomes the general vehicle lane 10.

Next, as shown in FIG. 2 (H), the right lining plate 16 is removed in the eighth step, the roadbed material 4 is excavated, and the existing right invert 3 is removed to form a space portion 19. The bottom surface of the space portion 19 is curved and excavated, and if necessary, is reinforced with a curved H-shaped steel or the like on the excavated bottom surface.

Next, as shown in FIG. 3 (I), in the ninth step, a lining plate 16 is laid on the center side, the lining plates 16 on both ends are removed, and a blow that hardens on the bottom surface of the space portion 19 in a short time. The glued concrete 20 is curved and sprayed to the entire left and right sides. The shotcrete 20 is obtained by adding a quick setting agent to plain concrete. By installing the shotcrete 20, the strength of the tunnel 1 can be increased and stabilized early after excavation. At this time, the central side where the lining plate 16 is laid becomes the general vehicle occupancy zone 10.

Next, as shown in FIG. 3 (J), when the shotcrete 20 formed in a curve is cured, the concrete is curved and placed on the entire left and right sides in the tenth step, and a new invert 3 is formed. All cross sections are formed integrally. Since this invert 3 is installed in the lower part of the lining concrete 2B, it is liable to cause poor adhesion due to the breathing of the concrete.

When the concrete is hardened, a new central drain groove 7 is installed in the eleventh step as shown in FIG. At this time, the central side where the lining plate 16 is laid becomes the general vehicle occupancy zone 10.

Next, as shown in FIG. 3 (L), the lining plate 16 is laid on the right side in the twelfth step, the left lining plate 16 and the cross beam 15 are removed, and the space 19 above the invert 3 on the left side. Is backfilled with the roadbed material 4, and this is temporarily paved with asphalt. At this time, the right side on which the lining plate 16 is laid becomes the general vehicle lane 10.

Next, as shown in FIG. 4 (M), the right lining board 16 and the cross beam 15 are removed in the thirteenth step, and the space 19 above the right invert 3 is backfilled with the roadbed material 4. Is temporarily paved with asphalt. In this case, the pile head of the pile 12 protruding above the invert 3 may be melted and removed. At this time, the left temporary pavement 13 becomes the general vehicle lane 10.

Next, as shown in FIG. 4 (N), the temporary pavement 13 is removed in the 14th step, and the roadbed material 4 is refilled on the invert 3. Thereafter, the groundwater is switched from the bypass water channel 17 to the central drainage channel 7 to flow. Thereafter, the bypass water channel 17 attached to the wall surface of the lining concrete 2 is removed. Next, concrete is placed on the entire left and right sides of the roadbed material 4 via the roadbed material 5 to form the pavement 6 and the inspection roads 8 are formed on the left and right sides. Complete. Such replacement work is performed within a range of, for example, 100 m from the entrance of the tunnel 1, and is sequentially repeated in the axial direction of the tunnel 1.

According to the inversion method of inverting the tunnel in service, construction can be performed while maintaining one-way alternating traffic without blocking the entire surface. In addition, it is possible to construct an invert with a seamless cross-section, and because the invert is reinforced with piles such as H-shaped steel, an invert with excellent strength and durability is formed, and the road surface is deformed over a long period of time. Can be prevented.

In the above description, the replacement method for constructing the new invert 3 by constructing the shotcrete 20 of the existing invert 3 is shown, but the method for constructing the invert 3 by omitting the shotcrete 20 may be used. In this case, FIG. 1 (A) to FIG. 2 (H) are the same, there is no spraying construction of the shotcrete 20 of FIG. 3 (I), and invert 3 similarly in the absence of the shotcrete 20 below. Will be formed.

The present invention can also be applied to a case where the invert 3 is newly installed in the tunnel 1 without the invert 3 at the time of construction. In this case, there is no invert 3 from FIG. 1 (A) to FIG. 2 (F), there is no process of removing the existing left invert 3 in FIG. 2 (G), and only the roadbed material 4 and the ground are excavated. There is no step of removing the invert 3 on the right side of FIG. 2 (H) and only the step of excavating only the roadbed material 4 and the natural ground. Thereafter, a new invert 3 is constructed in the same process as in FIGS. In this case, the shotcrete 20 may not be constructed.

In the case of the tunnel 1 without the central drain groove 7, the removal of the central drain groove 7, the installation of the bypass water channel 17, and the process of switching the water channel are unnecessary.

1 tunnel
2 lining concrete
3 Invert
4 Roadbed materials
5 Roadbed material
6 Paving
7 Central drain
8 Audit Path
10 General vehicle lane
12 piles
13 Temporary paving
15 horizontal girder
16 Lining board
17 Bypass waterway
19 Space
20 Shotcrete

According to claim 4 of the present invention, the inverting or inversion method of the tunnel in service according to claim 1 is the bypass according to claim 1, 2 or 3 before the step of further excavating the ground and removing the central drainage groove. After the step of switching to the water channel and the step of forming the invert, the central drainage channel is installed, the roadbed material is backfilled, and then the central drainage channel is installed to switch the bypass channel. Is.

According to the installation method of the invert of the tunnel in service according to claim 1 according to the present invention, when the invert is newly installed in the tunnel without the invert at the time of construction, the necessary width for passing the general vehicle on the lining plate is increased. It can always be secured at the left and right and the center, and construction can be done without blocking the entire surface. In addition, compared to the split construction on the left and right, it is possible to construct a seamless invert with an entire cross-section, and because the invert is reinforced with piles such as H-shaped steel, a new invert superior in strength and durability is formed. Deformation of the road surface can be prevented over a long period of time. Further, when the long distance section continuous construction, enables applying a plurality of work steps at the same time, it is possible to reduce the hand latency, efficiently and economically low cost construction.

According to the inverting method of the invert of the tunnel in service according to claim 2 according to the present invention, the existing invert is alternately removed, and the invert is newly installed. It is possible to form a new invert excellent in strength and durability and prevent road surface deformation over a long period of time.

Claims (5)

When installing inverts for in-service tunnels that have deformed on the road surface, the process of alternately removing pavement on one side, the process of alternately placing multiple piles on one side of the pavement removed, A horizontal girder is installed on the set pile head, and a process of laying a plurality of lining boards alternately on this, and removing the lining board on one side, excavating the roadbed material, and alternately creating space parts Forming a lining plate on the center side, removing the lining plates on both ends, placing concrete on the bottom surface of the space, and forming a new invert all in one section, one side Removing the lining board, laying the lining board on the other side, and alternately filling back the invert on one side with the roadbed material and paving the backfilled roadbed material with concrete An installation method for inverting a tunnel in service, characterized by comprising: In the replacement of the invert of the tunnel in service that has deformed the road surface, the process of alternately removing the pavement on one side, the process of alternately placing multiple piles on one side of the pavement removed, A horizontal girder is installed on the pile head that has been laid, and a plurality of lining boards are laid on top of each other, and one side of the lining board is removed, and the roadbed material is excavated to replace the existing invert. The process of forming the space part by removing them alternately, laying the lining board on the center side, removing the lining board on both ends, and placing concrete on the bottom of the space part, and creating a new invert in all cross sections A step of integrally forming, a step of removing the lining plate on one side, laying a lining plate on the other side, and alternately backfilling the invert on one side with the roadbed material, and the backfilled roadbed material In-service tunnel, characterized by comprising the step of paving concrete with concrete Hit instead method of over door. In the replacement of the invert of the tunnel in service that has deformed the road surface, the process of alternately removing the pavement on one side, the process of alternately placing multiple piles on one side of the pavement removed, A horizontal girder is installed on the pile head that has been laid, and a plurality of lining boards are laid on top of each other, and one side of the lining board is removed, and the roadbed material is excavated to replace the existing invert. Steps of alternately removing and forming a space portion, laying a lining plate on the center side, removing the lining plates on both ends, and bending and spraying spray concrete on the bottom surface of the space portion, The process of placing concrete on shotcrete to form a new invert all in one section, removing the lining board on one side and laying the lining board on the other side, Alternately backfill the roadbed with the roadbed material and the backfill Striking place method of the inverter tunnel serviced in, characterized in that comprising a step of paved over and. 4. Inverted tunnel invert installation or replacement method according to claim 1, 2 or 3, further comprising a step of switching to a bypass channel before the step of excavating the ground and removing the central drainage, and forming the invert. A method of installing or replacing the invert of the tunnel in service, comprising: a step of installing a central drainage channel, filling the roadbed material back, and then switching the bypass channel. In the installation or replacement method of the invert of a tunnel in service according to claim 1, 2 or 3, further installing a cross girder on the pile head that has been laid, and laying a plurality of lining boards alternately thereon In this process, the left and right cross beams are joined or contacted together, and both ends of the left and right cross beams are brought into contact with the lower ends of the arch-shaped lining concrete, which is also used for cutting. Installation or replacement method for invert tunnels in service.