JP5181661B2 - Tunnel internal structure and construction method - Google Patents

Description

  The present invention relates to a tunnel internal structure mainly used as a road tunnel and a construction method thereof.

  As a tunnel construction method, a shield method is generally known in which a tunnel is dug with a shield machine and a natural ground is covered with a segment ring at the tail portion.

  Also, as a method of using the tunnel constructed by the shield method, the invert part in the tunnel is backfilled to construct the roadbed, and the roadbed is constructed by laying crushed stones on it. A method of constructing a common groove for laying culverts and laying pipes and cables is generally known.

JP 2004-19285 A Japanese Patent Laid-Open No. 2004-19286 JP-A-6-2493 JP-A-8-210098 JP 2002-103321 A JP 2004-44300 A

  Conventionally, an arch culvert formed in an arch shape from the side wall portion to the top plate portion is used for the box culvert, and the arch culvert has a problem that the inner space cannot be made large for the height.

  Moreover, since it is not only necessary to form the top plate piece into an arch shape but also difficult to handle in shape, both the formation and construction of the top plate piece are troublesome.

  The present invention has been made to solve the above-described problems, and provides a tunnel internal structure and a construction method thereof that can secure a wide interior space while suppressing the height and can be efficiently constructed. For the purpose.

The construction method for the inside of the tunnel according to claim 1 includes a step of assembling a box culvert composed of a plurality of bottom plate pieces, side plate pieces, and top plate pieces into a rectangular cross section in the tunnel, and fluidized soil on both sides of the box culvert. And a method for constructing a roadbed on the tunnel , comprising the step of constructing a roadbed on the roadbed and the box culvert , wherein the fluidized soil is gradually increased in the upper layer. The fluidized soil having different strengths is filled in a plurality of layers so as to have strength .

  The present invention constructs a box culvert to be used as a joint groove into a rectangular cross-sectional shape by a four-piece piece of a bottom plate piece, a side plate piece, and a top plate piece, thereby reducing the height of the inner space as much as possible. It is designed to build a common groove.

  In addition, the interior of the tunnel culvert can be built very efficiently in parallel with the tunnel excavation by using the interior of the box culvert after construction from the completed part as a passage for material transport from the wellhead to the face. It is something that can be done.

  In assembling the box culvert, it is desirable to support the side plate piece and the top plate piece immediately after installation by using a support so that the side plate piece and the top plate piece are more stable. Further, a steel pipe or a shape steel is used for the support work, and for example, a temporary method such as installing the inner wall portion of the tunnel on the outer side of the side plate piece in a plurality of stages horizontally on the receiving portion may be used.

  Furthermore, the fluidized soil can be, for example, a mixture of cement, water, fluidizing agent, and the like mixed with tunnel excavated soil generated in large quantities on site. It is desirable to fill the fluidized soil having different strengths into multiple layers by appropriately adjusting the amount of the agent. Generally, it is desirable to fill the lower layer with low strength fluidized soil and gradually increase the strength of the upper layer.

  The roadbed can be constructed by a method according to the purpose of use in the tunnel, such as laying crushed stones, casting concrete to a predetermined thickness, or laying a precast concrete plate.

The construction method for the inside of the tunnel according to claim 2 includes a step of assembling a box culvert composed of a plurality of bottom plate pieces, side plate pieces, and top plate pieces into a rectangular cross section in the tunnel, and fluidized soil on both sides of the box culvert. a step of filling building the roadbed, and a said box culvert and construction method inside the tunnel comprising the step of building a road bed on the roadbed, the bottom plate piece, the side plate piece and said top plate piece and staggered alternately in an axial direction of the tunnel, and the bottom plate piece and uneven to be fitted with each other in the junction of the junction and the side plate piece and said top plate piece between the side plate piece A joint is provided.

  According to the present invention, the bottom plate piece, the side plate piece, and the top plate piece are arranged in a so-called staggered manner in the axial direction of the tunnel, so that the joints between the plates, which are structural weaknesses, are dispersed to reduce the strength reduction. It is a thing.

  In addition, by providing concave and convex joints that fit each other at the joints of the plates, the plates can be firmly joined together, together with the fact that the plates are arranged in a staggered manner in the axial direction of the tunnel. Thus, the self-supporting property of the side plate piece is improved, and in particular, the side plate piece immediately after installation is prevented from falling to the axial direction side of the tunnel.

The method for constructing the inside of the tunnel according to claim 3 includes the step of assembling a box culvert composed of a plurality of bottom plate pieces, side plate pieces and top plate pieces in the tunnel into a rectangular cross-section, and fluidizing treated soil on both sides of the box culvert. A construction method inside a tunnel comprising a step of building a roadbed by filling the box culvert and a step of building a roadbed on the roadbed, wherein the bottom plate piece and the top plate piece are on both left and right side portions. The side plate piece is provided with joints on both the upper and lower sides, and the tunnel interior construction method is characterized in that
Along with the above joints , reinforcing ribs (vertical hunches) are provided at both the left and right ends of the bottom plate piece and the top plate piece, respectively, to increase the rigidity of the joint portion. The side plate pieces can withstand the lateral pressure when the fluidized soil is filled by abutting the side surfaces.

Construction method inside the tunnel of the present invention, in a tunnel interior construction method as claimed in any one of claims 1 to 3, it is preferable to fix the bottom plate piece to the inner wall of the tunnel.

  The present invention is a measure for preventing the side plate piece from moving due to the side pressure when the fluidized soil is mainly filled outside the side plate piece.The inner wall portion of the tunnel (using a stopper having a simple structure) Segment). At that time, if the bottom plate pieces are laid in a state of being joined to each other in the axial direction of the tunnel, the bottom plate pieces may be fixed every other plurality.

The construction method inside the tunnel of the present invention, the bottom plate pieces adjacent to each other in the axial direction of the tunnel, coupled together side plate pieces with each other and Itadakiban pieces each other.

  As a method for joining the plates, there are, for example, a method of providing a joint composed of a tenon and a mortise on the joint surface of each plate, a method using a joint metal fitting, and the like.

The construction method for the inside of the tunnel according to claim 4 is the construction method for the inside of the tunnel according to claim 3, wherein the joint formed on each plate of the bottom plate piece, the side plate piece, and the top plate piece is a tunnel. Both end portions in the axial direction are convex, the central portion is concave, and the whole is formed concave in the axial direction of the tunnel.
Further, the construction method for the inside of the tunnel according to claim 5 is the construction method for the inside of the tunnel according to claim 4, wherein the side plate piece is between the two bottom plate pieces adjacent to each other in the axial direction of the tunnel. The joint convex portion formed at the end portion of each bottom plate piece and the concave portion of the joint formed at the center portion of the side plate piece are installed in a mutually engaged state. Between each two side plate pieces adjacent in the axial direction, the convex portion of the joint formed at the end of each side plate piece and the concave portion of the joint formed at the center portion of the top plate piece are mutually connected. The bottom plate piece, the side plate piece, and the top plate piece are arranged in a zigzag manner.
According to a sixth aspect of the present invention, there is provided a method for constructing a tunnel inside the tunnel, the step of assembling a box culvert composed of a plurality of bottom plate pieces, side plate pieces and top plate pieces into a rectangular cross section in the tunnel, and fluidization on both sides of the box culvert. A construction method inside a tunnel comprising a step of building a roadbed by filling with treated soil, and a step of building a roadbed on the box culvert and the roadbed, wherein a plurality of pieces are provided on the lower surface side of the bottom plate piece. A leg is projected, and a leg projecting along the circumferential direction of the tunnel is continuously projected in the axial direction of the tunnel at the lower end of the side plate piece. Reinforcing ribs are formed continuously in the axial direction of the tunnel at both left and right ends.

  In the present invention, a box culvert used as a common groove is constructed in a rectangular cross-section by a four-piece piece of a bottom plate piece, a side plate piece and a top plate piece, thereby constructing a wide internal hollow common groove while suppressing the height. It has the effect that it can do.

  In addition, the interior of the tunnel culvert can be built very efficiently in parallel with the tunnel excavation by using the interior of the box culvert after construction from the completed part as a passage for material transport from the wellhead to the face. There is also an effect that can be done.

  1 to 3 show an example of the structure inside the tunnel. A road bed 1 is constructed in a tunnel A excavated by a shield method, and a joint groove 3 composed of a box culvert 2 is constructed below the road bed 1. Further, a roadbed 4 made of fluidized soil is constructed on both sides of the box culvert 2.

  The roadbed 1 is constructed by laying crushed stones to a predetermined thickness on a box culvert 2 and a roadbed 4 on both sides thereof.

  The box culvert 2 includes a bottom plate piece (invert piece) 2A laid on the bottom of the tunnel A, a side plate piece 2B, 2B erected on both sides of the bottom plate piece 2A, and an upper end portion of the side plate piece 2B, 2B. It is constructed in a rectangular cross-sectional shape from the top plate piece 2C spanned between the two.

  The bottom surface side of the bottom plate piece 2A is formed in a convex curved shape along the inner surface of the tunnel A, and the upper surface side is formed flat. Further, a drainage groove 2a is formed at the center on the upper surface side of the bottom plate piece 2A, and a joint 2b and a reinforcing rib (haunch) 2c are formed on both sides. The drainage groove 2 a is formed continuously in the axial direction of the tunnel A.

  The side plate piece 2B and the top plate piece 2C are both formed in a rectangular plate shape, and joints 2b are formed at both the upper and lower ends of the side plate piece 2B and the left and right ends of the top plate piece 2C, respectively. Reinforcing ribs (haunches) 2c are formed at the left and right ends.

  The joint 2b formed on each plate of the bottom plate piece 2A, the side plate piece 2B, and the top plate piece 2C has a convex shape at both ends in the axial direction of the tunnel A, and a concave portion at the center portion. It is formed in a concave shape in the axial direction. Reinforcing ribs (haunches) 2c formed at both ends of the bottom plate piece 2A and the top plate piece 2C are formed continuously in the axial direction of the tunnel A inside the joint 2b.

  The bottom plate piece 2A, the side plate piece 2B, and the top plate piece 2C are all formed of precast concrete.

  The bottom plate piece 2A, the side plate piece 2B, and the top plate piece 2C formed in this way are laid in a state of being coupled to each other in the axial direction of the tunnel A. Further, the bottom plate pieces 2A, the side plate pieces 2B, and the top plate pieces 2C adjacent to each other in the axial direction of the tunnel A are joined to each other by a joint (not shown) composed of a tenon and a mortise formed on the joining surface. Has been.

  Further, in particular, each side plate piece 2B is formed between the two bottom plate pieces 2A, 2A adjacent to each other in the axial direction of the tunnel A, and the convex portion of the joint 2b formed at the end on the bottom plate piece 2A, 2A side. The concave portions of the joint 2b on the side plate piece 2B side are installed in a state where the concave portions are engaged with each other.

  Further, each top plate piece 2C is provided between the two side plate pieces 2B, 2B adjacent to each other in the axial direction of the tunnel A, and the convex portion of the joint 2b on the side plate piece 2B, 2B side and the top plate piece 2C side. It is installed in a state where the concave portions of the joint 2b are engaged with each other.

  Further, the convex portions of the joints 2b at the upper and lower ends of each side plate piece 2B are pin-joined to the end portions of the top plate piece 2C and the bottom plate piece 2A by a plurality of coupling bolts 5, respectively.

  With such a configuration, the bottom plate piece 2A and the side plate pieces 2B and 2B on both sides and the side plate pieces 2B and 2B and the top plate piece 2C are joined to each other in the circumferential direction and the axial direction of the box culvert 2, respectively. .

  The roadbed 4 is constructed by filling the fluidized soil into a plurality of layers on both sides of the box culvert 2. As the fluidized soil, a tunnel excavated soil with cement, water, and a fluidizing agent mixed and stirred is used.

  At that time, the lower layer portion is filled with the low strength fluidized soil, and the upper layer is gradually filled with the high strength fluidized soil.

  Next, a construction procedure for constructing the inside of the tunnel shown in FIG. 1 will be described (see Steps 1 to 6 in FIG. 4).

  First, the bottom plate piece 2A is laid on the bottom of the tunnel A. At that time, the bottom plate piece 2A is set by adjusting the height of the bottom plate piece 2A and, once the height is determined, injecting the adjustment mortar under the bottom plate piece 2A, or installing an adjustment liner or the like. Further, the bottom plate piece 2 </ b> A is fixed to the segment 6 installed as the lining material of the tunnel A by the anti-sliding stopper 7.

  The reason why the bottom plate piece 2A is fixed to the segment 6 is to prevent the bottom plate piece 2A from moving at the time of construction such as mainly when the fluidized soil is filled. Further, since the bottom plate piece 2A is laid while being joined to each other in the axial direction of the tunnel A, the bottom plate piece 2A may be fixed for each plurality.

  Next, the side plate pieces 2B and 2B are respectively built on both sides of the bottom plate piece 2A, and the top plate piece 2C is bridged between the side plate pieces 2B and 2B. And it is made to become independent by supporting with the support work (temporary support) 8 from the outer side of the side plate pieces 2B and 2B. Steel pipes or steel materials are used for the support work 8, and a plurality of stages are installed outside the side plate pieces 2B and 2B.

  The bottom plate piece 2A, the side plate piece 2B, and the top plate piece 2C are assembled by a plurality in the axial direction of the tunnel A, and a dedicated assembly cart (centre) 9 as shown in the drawing is used.

  The assembly cart 9 is configured to straddle the box culvert 1, and is configured to be self-propelled in the axial direction in the tunnel A by power. A crane (lifter) 10 is provided, and the bottom plate piece 2A, the side plate piece 2B and the top plate piece 2C can be freely suspended and transferred to a predetermined position.

  Thus, when the assembly of the bottom plate piece 2A, the side plate pieces 2B, 2B and the top plate piece 2C is completed for a predetermined length in the axial direction of the tunnel A, the crushed stone is laid on the bottom of the outside of the side plate pieces 2B, 2B. Fill with fluidized solidified soil. The fluidized soil is filled in a plurality of layers, and when the fluidized soil is solidified to a predetermined strength, the fluidized soil is removed sequentially from the lower support 8.

  Thus, the fluidized soil is filled to the same height as the upper end of the box culvert 2, and when the fluidized soil is solidified to a predetermined strength, crushed stones are filled to a predetermined thickness on the road bed 1 Build up.

  Further, when the assembly of the box culvert 2 having a predetermined length (block) and the construction of the roadbed 4 and the roadbed 1 are completed in this way, the next block is constructed by the same construction procedure.

  At that time, the interior of the tunnel can be constructed very efficiently in parallel with the tunnel excavation by using it as a passage for transporting materials such as segments from the completed part of the box culvert 1 to the face side from the wellhead. can do.

  5 to 7 show modified examples of the structure inside the tunnel. In the figure, the lower surface side of the bottom plate piece 2A is formed in a convex curved shape along the inner surface of the tunnel A, and the upper surface side is formed flat. Further, a drain groove 2a is formed in the center portion on the upper surface side of the bottom plate piece 2A, and reinforcing ribs (haunches) 2c, 2c are formed continuously in the axial direction of the tunnel A, respectively.

  Further, a plurality of leg portions 2d, 2d are projected on the lower surface side of the bottom plate piece 2A, whereby a certain gap is formed between the bottom plate piece 2A and the bottom portion of the tunnel A.

  Then, filling the gap portion with the adjustment mortar 11 corrects the misalignment between the bottom plates 2A and 2A, and each bottom plate piece 2A receives the load evenly over the entire plate.

  Reference numeral 2e denotes an injection hole for filling the adjustment mortar 11, and the injection hole 2e is formed at the center of the bottom plate piece 2A.

  Both the side plate piece 2B and the top plate piece 2C are formed in a rectangular plate shape, and in particular, a leg portion 2f protruding along the circumferential direction of the tunnel A at the lower end portion of the side plate piece 2B is continuous in the axial direction of the tunnel A. Projecting.

  Since the leg portion 2f as described above protrudes from the lower end portion of the side plate piece 2B, when the left and right side plate pieces 2B and 2B are installed on both sides of the bottom plate piece 2A, the tip end portion of the leg portion 2f. Is placed against the end of the bottom plate piece 2A and the lower surface portion is placed in contact with the bottom portion of the tunnel A (inner side surface of the segment), whereby the side plate piece 2B can be installed in a stable state.

  Further, the corner portions on both sides of the bottom portion of the box culvert 2 are integrally formed with the side plate piece 2B as the leg portions 2f of the side plate piece 2B. Since there is no joint part of the plate piece 2B, it is excellent in strength.

  Reinforcing ribs 2c are continuously formed in the axial direction of the tunnel A at both left and right ends of the top plate piece 2C. Furthermore, the lower surface side of the top plate piece 2C illustrated in FIG. 6B is formed in an arch shape. Thus, the bottom face side of the top plate piece 2C is formed in an arch shape, whereby the bending strength of the top plate piece 2C can be improved and the weight can be reduced.

  In addition, the bottom plate piece 2A, the side plate piece 2B, and the top plate piece 2C in this example are also formed of precast concrete as in the previous example.

  The bottom plate piece 2A, the side plate piece 2B, and the top plate piece 2C formed in this way are laid in a state of being coupled to each other in the axial direction of the tunnel A. Further, the bottom plate pieces 2A, the side plate pieces 2B, and the top plate pieces 2C adjacent to each other in the axial direction of the tunnel A are joined to each other by a joint (not shown) composed of a tenon and a mortise formed on the joining surface. Has been.

  Further, the bottom plate piece 2A and the left and right side plate pieces 2B and 2B adjacent to each other in the circumferential direction of the tunnel A and the left and right side plate pieces 2B and 2B and the top plate piece 2C are also joined to each other by a coupling bolt (not shown). Yes.

  In this embodiment, the bottom plate piece 2A, the left and right side plate pieces 2B, 2B and the top plate piece 2C are arranged so as to constitute one ring of a box culvert as shown in FIG. As shown in the previous embodiment, they may be shifted from each other in the axial direction of the tunnel A.

  The construction method of the box culvert including the construction of the roadbed 1 and the roadbed 4 and the construction method thereof is substantially the same as the previous embodiment.

  The present invention can construct the inside of the tunnel very efficiently in parallel with the tunnel excavation.

It is sectional drawing which shows the structure inside the tunnel constructed | assembled as a road tunnel. A box culvert is shown, (a) is a longitudinal sectional view in the direction perpendicular to the axis, and (b) is a sectional view in the axial direction. (a), (b) is an exploded perspective view of a box culvert. Step.1 to Step.6 are longitudinal sectional views in the direction perpendicular to the axis of the tunnel showing the construction procedure. It is a partial perspective view which shows the modification of a box culvert. (a), (b) is a longitudinal cross-sectional view in the direction perpendicular to the axis showing a modification of the box culvert. The modification of a bottom plate piece is shown, (a), (c) is sectional drawing, (b) is a bottom view, (d) is a side view.

Explanation of symbols

1 subgrade 2 box culvert 2A bottom plate piece 2B side plate piece 2C top plate piece 2a drainage groove 2b joint 2c reinforcing rib (haunch)
2d Leg 2e Injection hole 2f Leg 3 Joint groove 4 Roadbed 5 Bonding bolt 6 Segment 7 Stopper 8 Supporting 9 Assembly truck 10 Mobile crane 11 Adjusting mortar

Claims (6)

Assembling a box culvert composed of a plurality of bottom plate pieces, side plate pieces and top plate pieces in a tunnel into a rectangular cross-sectional shape, filling both sides of the box culvert with fluidized soil, and building a roadbed; A method for constructing a tunnel inside a box culvert and a step of constructing a roadbed on the roadbed , wherein the fluidized soil is fluidized with different strength so that the upper layer gradually becomes stronger. A method for constructing a tunnel, characterized in that the soil is divided into multiple layers and filled . Assembling a box culvert composed of a plurality of bottom plate pieces, side plate pieces and top plate pieces in a tunnel into a rectangular cross-sectional shape, filling both sides of the box culvert with fluidized soil, and building a roadbed; A tunnel culvert and a method for constructing a roadbed on the roadbed , wherein the bottom plate piece, the side plate piece and the top plate piece are alternately shifted in the axial direction of the tunnel. And a concave-convex joint that fits to each other at a joint portion between the bottom plate piece and the side plate piece and each joint portion between the side plate piece and the top plate piece . Construction method. Assembling a box culvert composed of a plurality of bottom plate pieces, side plate pieces and top plate pieces in a tunnel into a rectangular cross-sectional shape, filling both sides of the box culvert with fluidized soil, and building a roadbed; A construction method inside a tunnel comprising a box culvert and a step of building a road bed on the roadbed , wherein the bottom plate piece and the top plate piece are provided with joints and reinforcing ribs on both right and left sides, and the side plate piece Is equipped with joints on both upper and lower sides . The joint formed on each of the bottom plate piece, the side plate piece, and the top plate piece has a convex shape at both ends in the axial direction of the tunnel and a concave shape at the central portion, so that the joint is formed in the axial direction of the tunnel as a whole. The tunnel interior construction method according to claim 3, wherein the tunnel is constructed in a concave shape. Between the two bottom plate pieces adjacent to each other in the axial direction of the tunnel, the side plate piece has a joint convex portion formed at the end of each bottom plate piece and a joint formed at the center of the side plate piece. The top plate piece is formed at the end of each side plate piece between each two side plate pieces adjacent to each other in the axial direction of the tunnel. The convex portion of the joint and the concave portion of the joint formed at the central portion of the top plate piece are installed in a mutually engaged state, and the bottom plate piece, the side plate piece and the top plate piece are arranged in a staggered manner The tunnel internal construction method according to claim 4, wherein the tunnel is built. Assembling a box culvert composed of a plurality of bottom plate pieces, side plate pieces and top plate pieces in a tunnel into a rectangular cross-sectional shape, filling both sides of the box culvert with fluidized soil, and building a roadbed; And a step of constructing a roadbed on a box culvert and the roadbed, and a plurality of legs projecting from the lower surface side of the bottom plate piece, Legs projecting along the circumferential direction of the tunnel are provided at the lower end portion so as to protrude continuously in the axial direction of the tunnel, and reinforcing ribs are continuously provided in the axial direction of the tunnel at the left and right end portions of the top plate piece. A tunnel interior construction method characterized by being formed as a

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