Arch-shaped precast concrete slab connection structure

Abstract

To provide a joint structure for arch-shaped precast panels that can prevent misalignment at edges of the arch-shaped precast panels.SOLUTION: Arch-shaped precast panels 11, 21 are divided in a circumferential direction, and bolt members 80 are inserted into holes 71 that are continuous in a width direction of one and the other arch-shaped precast panels 11, 21, and tops of the panels are connected together by the bolt members 80. The bolt member 80 is inserted into the through hole 71 in a way that it can be moved from inner surfaces 11U, 21U to outer surfaces 11G, 21G of the arch-shaped precast panel 11, 21. When the bolt member 80 is pushed to the outer surfaces 11G, 21G of the arch-shaped precast plates 11, 21 by pressing means 85, an upper surface 83 of the bolt member 80 comes into contact with an upper surface 73 of the through hole 71, which is continuous with convex portions of both arch-shaped precast plates 11, 21, and the through holes 71 of both convex parts are pushed by the bolt member 80, so that inner and outer directions of the arch-shaped precast plates of both convex parts are aligned.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a connection structure for arch-shaped precast slabs. [Background technology]

[0002] Conventional examples of structures that use this type of connecting structure for arch-shaped precast panels include a snow shelter, which is an arch-shaped hollow structure constructed by connecting and fastening the tops of left and right unit panels, which are arch-shaped precast panels, with top connectors (for example, Patent Document 1); an arch-shaped culvert, which is an arch-shaped hollow structure constructed by fastening the tops of left and right arch-shaped unit panels, which are arch-shaped precast panels, with PC steel rods (for example, Patent Document 2); an arch-shaped hollow structure that uses curved arch-shaped precast panels made of concrete that are divided into two, left and right, circumferentially around an arch-shaped tunnel hole, and has steps formed at the top ends of the left and right arch-shaped precast panels that engage with each other and are fastened together with bolts inserted through the steps (for example, Patent Document 3); and an arch-shaped hollow structure that is constructed by fastening the top ends of the left and right arch-shaped precast panels with steps consisting of convex and concave parts that fit together alternately and are fastened together with bolts inserted through these convex and concave parts (for example, Patent Document 4).

[0003] In Patent Document 1, the tops of the left and right unit panels are fastened with top connectors in the left-right direction (circumferential direction of the unit panels), in Patent Document 2, the tops of the left and right arch-shaped unit panels are fastened with PC steel rods in the left-right direction, in Patent Document 3, the tops of the left and right arch-shaped precast panels are fastened with double-threaded bolts in the front-to-back direction, and in Patent Document 4, the tops of the left and right arch-shaped precast panels are fastened and connected with bolts in the front-to-back direction, and in all of these cases, if there is a misalignment at the left and right tops, it is not possible to correct the misalignment with connectors or the like.

[0004] For example, in Patent Document 3, the stepped holes through which the two threaded bolts are inserted are formed sufficiently larger than the two threaded bolts so that the two threaded bolts can be inserted smoothly. Therefore, when a force is applied to press down on the top of one of the left and right arch-shaped precast slabs, the gap between the stepped hole and the two threaded bolts causes the top of one of the left and right arch-shaped precast slabs to be lower than the top of the other left and right arch-shaped precast slab, and there is a risk that a step will be created at the top of the left and right arch-shaped precast slabs.

[0005] Furthermore, in order to insert both threaded bolts in the forward and backward directions into the stepped holes in the stepped portions of the left and right arch-shaped precast slabs, it was necessary to slide both threaded bolts lengthwise to insert them into the stepped holes, and if this was to be done in a position close to the inner surface of the tunnel, there was the problem that the work was time-consuming.

[0006] Furthermore, in a connection structure using double-threaded bolts, it is necessary to provide unevenness at the ends of the arch-shaped precast slabs, and only the divided parts in the circumferential direction can be connected.

[0007] Furthermore, in conventional connecting structures using double-ended threaded bolts, while it is possible to pull out and remove both threaded bolts from the longitudinal ends of arch-shaped precast slabs arranged side by side in the longitudinal direction, it is not possible to pull out both threaded bolts from intermediate arch-shaped precast slabs, making it impossible to easily replace only intermediate arch-shaped precast slabs for repairs, etc. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 2-157307 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-337092 [Patent Document 3] Japanese Patent Application Publication No. 5-295992 [Patent Document 4] Japanese Patent Application Laid-Open No. 2005-315029 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0009] Therefore, the present invention aims to solve the above problems and to provide a connecting structure for arch-shaped precast slabs that can adjust the height of the ends of the arch-shaped precast slabs, and also to provide a connecting structure for arch-shaped precast slabs that is highly versatile and makes connecting work easy. [Means for solving the problem]

[0010] The invention of claim 1 is characterized in that, in a connecting structure of arch-shaped precast slabs in which the butt surfaces of adjacent ends are butted together to form an arch shape, the structure is provided with an attachment member that is attached to the arch-shaped precast slab from the inner surface side of the arch-shaped precast slab to prevent the adjacent ends from shifting.

[0011] Also, Claim 1 The invention is such that the arch-shaped precast slab is divided in the circumferential direction, and the ends of one and the other adjacent arch-shaped precast slabs in the circumferential direction are fitted together by a convex portion and a concave portion, and through holes are formed in the width direction of the arch-shaped precast slab that are continuous with the convex portions of the ends of the one and the other arch-shaped precast slabs, and The aforementioned A bolt member is inserted into the through hole, connecting the ends together, the bolt member is loosely inserted into the through hole so as to be movable from the inner surface side to the outer surface side of the arch-shaped precast plate, abutment portions are provided on the outer surface side of the arch-shaped precast plate that abut against the outer surface sides of the arch-shaped precast plate of the continuous through holes, and a pressing member is provided as the mounting member that presses the bolt member toward the outer surface side of the arch-shaped precast plate.

[0012] Claim 2The invention is characterized in that the bolt member comprises a main body on which the abutment portion is provided and male screw portions provided on both ends of the main body, a recess communicating with the through hole is formed on the inner surface of the end, and a nut is screwed onto the male screw portion protruding into this recess.

[0013] Claim 3 The invention is characterized in that the bolt member comprises a main body provided with the abutment portion and male screw portions provided on both ends of the main body, a female screw hole is provided between the inner surface of the arch-shaped precast plate and the through hole, and the pressing member is a bolt that is screwed into the female screw hole and whose tip side abuts against the inner surface side of the arch-shaped precast plate of the main body. [Effects of the Invention]

[0014] According to the configuration of claim 1, by attaching the mounting member from the inner surface side of the arch-shaped precast slab, it is possible to prevent displacement of adjacent ends.

[0015] Also, Claim 1 According to this configuration, when the pressing member presses the bolt member toward the outer surface of the arch-shaped precast slab, the abutment portion of the bolt member abuts against the outer surface sides of the through holes that are continuous with the convex portions of both arch-shaped precast slabs, and the outer surface sides of the through holes in both convex portions are pressed by the bolt member, thereby aligning both convex portions in the inner and outer surface directions of the arch-shaped precast slab. This makes it possible to prevent the occurrence of a step between the ends of one and the other circumferentially adjacent arch-shaped precast slabs.

[0016] Claim 2 According to this configuration, the abutment portion provided on the main body of the bolt member presses the outer side of the through holes of both convex portions, thereby aligning both convex portions on the inner and outer surfaces of the arch-shaped precast plate, preventing the occurrence of steps between the ends of one and the other adjacent arch-shaped precast plates in the circumferential direction, and in this state a nut can be screwed onto the male thread portion to connect the ends of the arch-shaped precast plates.

[0017] Claim3 According to the configuration of (1), when the bolt is screwed in, the tip of the bolt presses against the body, and the body presses against the outer surface of the arch-shaped precast slab in the through hole. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional view of an arch-shaped hollow structure showing a first embodiment of the present invention. [Figure 2] FIG. 10 is a bottom view of the top of the arch-shaped precast slab in the joined state. [Figure 3] FIG. 10 is a perspective view of the top of the arch-shaped precast slab. [Figure 4] FIG. 10 is a perspective view of the top of the arch-shaped precast slab in the joined state. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 10 is a cross-sectional view of the top portion of the same as above, with the bolt member inserted therethrough. [Figure 8] This is a cross-sectional view of the top of the same structure, in which the abutment portion of the bolt member is abutted against the outer surface of the arch-shaped precast slab of the through hole by the pressing means. [Figure 9] FIG. 10 is a cross-sectional view of the top of a modified through-hole according to the first embodiment. [Figure 10] FIG. 1 is a bottom view of the top of an arch-shaped precast slab in a joined state, showing Reference Example 1 of the present invention. [Figure 11] FIG. 10 is a bottom view of the top of the arch-shaped precast slab. [Figure 12] 12A and 12B are cross-sectional views of the top portion of the same, where FIG. 12A shows the state before connection and FIG. 12B shows the state after connection. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] FIG. 10 is a cross-sectional view of an arched tunnel showing a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the embodiments described below do not limit the content of the present invention as defined in the claims. Furthermore, not all of the configurations described below are necessarily essential requirements of the present invention. [Example]

[0020] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figures 1 to 9 show a first embodiment of the present invention, and Figure 1 shows a cross section of an arch-shaped hollow structure 1, in which concrete foundations 3, 3 are provided on both sides of a road surface 2, and a pair of left and right arch-shaped precast panels 11, 21 made of precast concrete are assembled into an arch shape and installed.

[0021] Specifically, bearing surfaces 4 are provided on the concrete foundations 3, 3, mounting parts 5 are protruded from the outside of these bearing surfaces 4, the lower ends 11K, 21K of the arch-shaped precast slabs 11, 21 are placed on the bearing surfaces 4, 4, the lower parts of the arch-shaped precast slabs 11, 21 are fixed to the mounting parts 5, 5 by fixing means 6, and the upper ends of each arch-shaped precast slab 11, 21 abut against each other. The fixing means 6 comprises two threaded bolts 6A in the road surface width direction that are inserted through the lower parts of the arch-shaped precast slabs 11, 21 and the mounting parts 5, 5, and nuts 6B, 6B that screw onto both ends of the two threaded bolts 6A.

[0022] The arch-shaped precast slabs 11, 21 on one side and the other (right and left) are arranged in parallel in the lengthwise direction so that the length direction of the road surface 2 that will become the road is aligned with the width direction, and the end faces 12, 12, 22, 22 at both ends in the widthwise direction are butted against each other. The arch-shaped precast slabs 11, 21 are formed to have the same width in the lengthwise direction of the road surface.

[0023] As shown in the bottom view of Figure 2, the top 13 located at the top center of the hollow structure of the right arch-shaped precast slab 11, one of the left and right sides, has an approximately square convex portion 61 on the other side in the width direction, and has an approximately square concave portion 62 on one side in the width direction corresponding to this convex portion 61, and a step surface 63 is formed between the convex portion 61 and the concave portion 62 in the direction perpendicular to the width direction of the arch-shaped precast slab 11.

[0024] The width of the convex portion 61 and the width of the concave portion 62 are substantially the same, the tip surface of the convex portion 61 is a tip abutting surface 64 , and the bottom surface of the concave portion 62 is a base abutting surface 65 .

[0025] The top 23 located at the top center of the hollow structure of the left arch-shaped precast slab 21, the other of the left and right sides, has a convex portion 61A on one side in the width direction and a concave portion 62A on one side in the width direction corresponding to this convex portion 61A, and a step surface 63 is formed between the convex portion 61A and the concave portion 62A in a direction approximately intersecting the width direction of the arch-shaped precast slab 21.

[0026] The width of the convex portion 61A and the width of the concave portion 62A are substantially the same, the tip surface of the convex portion 61A is a tip abutting surface 64A, and the bottom surface of the concave portion 62A is a base abutting surface 65A.

[0027] The tip abutting surface 64 of one arch-shaped precast slab 11 is abutted against the base abutting surface 65A of the other arch-shaped precast slab 21, and the base abutting surface 65 of one arch-shaped precast slab 11 is abutted against the tip abutting surface 64A of the other arch-shaped precast slab 21. In addition, the step surfaces 63, 63 of the tops 13, 23 are abutted against each other.

[0028] In addition, the arch-shaped precast slabs 11, 21 adjacent to each other in the longitudinal direction of the road surface 2 serving as a passageway are installed with their end faces 12, 22 aligned.

[0029] Next, we will explain the connecting structure 70 for the apexes 13, 23, which are the ends of the pair of left and right arch-shaped precast slabs 11, 21. Through holes 71, 71 are formed in the convex portions 61, 61A of the left and right arch-shaped precast slabs 11, 21 in the width direction of the arch-shaped precast slabs 11, 21. Then, with the apexes 13, 23 fitted together, the through holes 71, 71 of the convex portions 61, 61A communicate with each other.

[0030] As shown in Figure 6, the through hole 71 has inner surfaces 72, 72 that taper from the inner surface 11U, 21U of the arch-shaped precast slab 11, 21 toward the outer surface 11G, 21G, an upper surface portion 73 connecting the upper parts of these inner surfaces 72, 72, and a lower surface portion 74 connecting the lower parts of these inner surfaces 72, 72, and has a cross section that is a symmetrical isosceles trapezoid.

[0031] The inner surface of the through-hole 71 can be formed by using a die to form a concrete surface, or by providing an isosceles trapezoidal pipe material by insert molding, as will be described later.

[0032] Recesses 76, 76 opening onto the inner surfaces 11U, 21U are provided at the widthwise center of the protrusions 61, 61A, and these recesses 76, 76 divide the through hole 71 into a through hole end surface side 171 on the end surfaces 12, 22 side and a through hole step surface side 171A on the step surfaces 63, 63 side. Furthermore, these through hole end surface side 171 and through hole step surface side 171A open onto the fixing surfaces 77, 77 of the recess 76, the through hole end surface sides 171, 171 open onto the end surfaces 12, 22, and the through hole step surface side 171A, 171A open onto the step surfaces 63, 63. The through hole end surface side 171 is one through hole dividing portion, and the through hole step surface side 171A is the other through hole dividing portion.

[0033] The recess 76 is approximately box-shaped, and the fixing surfaces 77, 77 are provided on both sides of the width of the arch-shaped precast slab 11, 21 of the recess 76. The fixing surfaces 77, 77 on both sides are parallel, and as shown in Figure 6, the spacing between the side surfaces on both sides tapers toward the outer surface.

[0034] The recess 76 opens to the inner surfaces 11U, 21U and is provided with a lid 78 (FIG. 2) that closes the opening, and the lid 78 is detachably attached to the inner surfaces 11U, 21U by screws 79 that serve as attachment and detachment means.

[0035] A bolt member 80 (Fig. 5) is provided which is inserted into the through hole 71 to connect the ends of the left and right arch-shaped precast slabs 11, 21. The bolt member 80 is made of a hard material such as metal and integrally comprises a main body 81 which engages with the through hole 71 and male screw portions 81N, 81N which serve as threaded rods provided on both ends of the main body 81.

[0036] The main body 81 has side portions 82, 82 that taper apart toward the upper side to correspond to the through hole 71, an upper surface portion 83 that serves as an abutment connecting the upper parts of the side portions 82, 82, and a lower surface portion 84 that connects the lower parts of the side portions 82, 82, and has an isosceles trapezoidal cross section, the width of the upper surface portion 83 is the same as that of the upper surface portion 73 of the through hole 71, the included angle between the side portions 82, 82 is equal to the included angle between the inner surfaces 72, 72 of the through hole 71, the side portions 82 are shorter than the inner surfaces 72 of the through hole 71, and the height dimension of the main body 81 is smaller than the height dimension of the through hole 71.

[0037] The outer surface side of the arch-shaped precast plates 11, 21 of the main body 81 is the upper surface portion 83, and the inner surface side of the arch-shaped precast plates 11, 21 of the main body 81 is the lower surface portion 84.

[0038] Therefore, the bolt member 80 can be loosely inserted into the through-hole 71, which has a smaller cross section than the main body 81, and the insertion of the bolt member 80 can be easily performed.

[0039] Further, a pressing means 85 (FIG. 8) is provided for pressing the bolt member 80 loosely inserted into the through-hole 71 toward the outer surfaces 11G, 21G of the arch-shaped precast slabs 11, 21.

[0040] The pressing means 85 has female screw holes 86 provided at multiple locations (two locations) on the inner surfaces 11U, 21U (Figure 2), which communicate with the through hole end surface side 171, which is one side of the through hole, and the underside surface 74 of the through hole step surface side 171A, which is the other side of the through hole, and is formed by screwing bolts 88 into the female screw holes 86 from the inner surface 11U, 21U side.

[0041] By screwing the bolt 88 in, the tip of the bolt 88 presses the lower surface 84 of the main body 81 , and the main body 81 fits into the upper part of the through-hole 71 .

[0042] The bolt 88 is a pressing member that presses the bolt member 80 toward the outer surface 11G, 21G of the arch-shaped precast slab 11, 21, and is also an attachment member that attaches the bolt member 80 to the arch-shaped precast slab 11, 21 from the inner surface 11U, 21U side of the arch-shaped precast slab 11, 21.

[0043] The female screw hole 86 can be formed by providing a female cylindrical portion 87 in the arch-shaped precast plates 11, 21 by insert molding, and by providing the female screw hole 86 in this female cylindrical portion 87. The female cylindrical portion 87 is made of a hard material such as metal.

[0044] When connecting the left and right arch-shaped precast slabs 11, 21, the tops 13, 23 are butted together, and the bolt members 80 are loosely inserted into the through-holes 71 between the recesses 76, 76 (Fig. 7). Then, the male screw portions 81N, 81N at both ends are positioned in the recesses 76, 76, and the male screw portions 81N are inserted into the through-holes 89T of the fixing plate 89. The fixing plate 89 is then abutted against the fixing surface 77, and a nut 90, serving as a fixing means, is screwed onto the male screw portion 81N. This screwing is performed provisionally.

[0045] After this, when the bolts 88, 88 are screwed in, the tips of the bolts 88, 88 press against the underside 84 of the main body 81, causing the approximately trapezoidal main body 81 to move toward the outer surfaces 11G, 21G, and the main body 81 fits into the upper part of the through hole 71 as shown in Figure 8.

[0046] In this fitted state, the upper surface 83 of the main body 81 is pressed against the upper surface 73 of the through-hole end surface side 171 and the through-hole step surface side 171A of the arch-shaped precast slabs 11 and 21, thereby aligning the height positions of the peaks 13 and 23 of both arch-shaped precast slabs 11 and 21. In other words, the upper surface 83 of the main body 81 abuts against the upper surface 73 of both the through-hole end surface side 171 and the through-hole step surface side 171A. After aligning the height positions of the peaks 13 and 23 of both arch-shaped precast slabs 11 and 21 in this way, the nuts 90 are finally tightened.

[0047] In addition, in the fitted state, the left and right pair of side portions 82, 82 of the main body 81 fit into the left and right pair of inner side surfaces 72, 72 of the through-hole 71, thereby aligning the arch direction positions of the arch-shaped precast panels 11, 21 of the tops 13, 23. In this way, the left and right side portions 82, 82 and the top surface portion 83 of the main body 81 become fitting portions that fit into the upper part of the through-hole 71.

[0048] FIG. 9 shows a modified example of the through hole 71, in which the through hole 71 is formed by a pipe material 75 formed in an isosceles trapezoidal shape.

[0049] This allows the through hole 71 to be formed without using a punching die, and the inner surface of the pipe material 75 made of metal or the like is smoother than the concrete surface, allowing the main body 81 of the bolt member 80 to be smoothly inserted and fitted. The pipe material 75 has a through hole corresponding to the female screw hole 86, through which the bolt 88 is inserted.

[0050] In this way, in this embodiment, in the connection structure of the arch-shaped precast slabs 11, 21, which are connected by butting together the tip butt surface 64 and the base butt surface 65A, which are the butt surfaces of the adjacent end portions or peaks 13, 23, and the base butt surface 65 and the tip butt surface 64A, a bolt 88 is provided as an attachment member that is attached to the arch-shaped precast slabs 11, 21 from the inner surface 11U, 21U side of the arch-shaped precast slabs 11, 21 to prevent misalignment of the adjacent peaks 13, 23.Therefore, by attaching the bolt 88 from the inner surface 11U, 21U side of the arch-shaped precast slabs 11, 21, misalignment of the adjacent peaks 13, 23 can be prevented.

[0051] In this embodiment, the arch-shaped precast slabs 11, 21 are divided in the circumferential direction, and the apexes 13, 23 of the circumferentially adjacent arch-shaped precast slabs 11, 21 are fitted together by the projections 61, 61A and the recesses 62, 62A, respectively. Through holes 71 are formed in the width direction of the arch-shaped precast slabs 11, 21, continuing to the projections 61, 61A of the apexes 13, 23 of the arch-shaped precast slabs 11, 21. The bolt members 80 are inserted into the through holes 71 that are continuous in the width direction of the arch-shaped precast slabs 11, 21, and the bolt members 80 are fastened to the through holes 71. The tops 13, 23 are connected to each other by a member 80, and the bolt member 80 is loosely inserted into the through hole 71 so as to be movable from the inner surface 11U, 21U side of the arch-shaped precast slabs 11, 21 to the outer surface 11G, 21G side. An upper surface portion 83 is provided on the outer surface 11G, 21G side of the arch-shaped precast slabs 11, 21 of the bolt member 80, as an abutment portion that abuts against the upper surface portion 73 on the outer surface 11G, 21G side of the arch-shaped precast slabs 11, 21 of the continuous through hole 71, and a pressing means 85 is provided to press the bolt member 80 toward the outer surface 11G, 21G side of the arch-shaped precast slabs 11, 21.

[0052] Since the above-mentioned configuration is adopted, when the bolt member 80 is pressed toward the outer surfaces 11G, 21G of the arch-shaped precast slabs 11, 21 by the pressing means 85, the upper surface portion 83 of the bolt member 80 contacts the convex portions of both the arch-shaped precast slabs 11, 21. 61,61A The upper surface 73 of the through hole 71 is in contact with the upper surface 73 of the through hole 71. 61,61AThe through hole 71 extending between the two protrusions is pressed by the bolt member 80. 61,61A The inner and outer surface directions (thickness direction) of the arch-shaped precast slabs 11 and 21 are aligned, thereby preventing the occurrence of a step between the ends of one and the other arch-shaped precast slabs 11 and 21 that are adjacent in the circumferential direction.

[0053] In this embodiment, the bolt member 80 comprises a main body 81 having an upper surface portion 83 as an abutment portion, and male screw portions 81N provided on both ends of the main body 81. A recess 76 communicating with the through hole 71 is formed on the inner surface 11U, 21U of the end apex 13, 23, and a nut 90 is screwed onto the male screw portion 81N protruding into this recess 76. Therefore, the upper surface portion 73 as an abutment portion provided on the main body 81 of the bolt member 80 presses against the outer surfaces 11G, 21G of the through hole 71 of both convex portions 61, 61A, thereby aligning both convex portions 61, 61A in the inner and outer directions of the arch-shaped precast slabs, and preventing the occurrence of steps between the ends of one and the other adjacent arch-shaped precast slabs 11, 21 in the circumferential direction. In this state, the nut 90 can be screwed onto the male screw portion 81N to connect the ends of the arch-shaped precast slabs 11, 21.

[0054] In this embodiment, the bolt member 80 comprises a main body 81 having an upper surface portion 83 which serves as an abutment portion, and male screw portions 81N provided on both ends of the main body 81, and the pressing means 85 comprises a female screw hole 86 provided between the inner surface 11U, 21U of the arch-shaped precast slab 11, 21 and the through hole 71, and a bolt 88 which is threaded into this female screw hole 86 and whose tip side abuts against the lower surface portion 84 which is the inner surface side of the arch-shaped precast slab of the main body 81.Therefore, by screwing in the bolt 88, the tip of the bolt 88 presses the main body 81, and the main body 81 presses the upper surface portion 73 which is the outer surface side of the arch-shaped precast slab of the through hole 71.

[0055] As an effect of the embodiment, the through hole 71 is reduced from the inner surface side of the arch-shaped precast slab to the outer surface side, and the bolt member 80 is provided with a main body 81 which is a reduced portion corresponding to the cross-sectional shape of the through hole 71, and on the outer surface side of this main body 81 of the arch-shaped precast slab, an upper surface portion 83 is provided which is an abutment portion that abuts against the upper surface portion 73 on the outer surface side of the arch-shaped precast slab of the through hole 71, and a pressing means 85 is provided which presses the main body 81 toward the outer surfaces 11G, 21G, so that the main body 81 fits smoothly into the upper part of the through hole 71 and the two apexes 13, 23 are aligned.

[0056] Further, the through hole 71 has inner side surfaces 72, 72 whose spacing narrows in a tapered manner from the inner surface 11U, 21U side of the arch-shaped precast slabs 11, 21 toward the outer surface 11G, 21G side, and the main body 81 has side portions 82, 82 whose spacing narrows in a tapered manner toward the upper side. The upper surface portion 83 abuts against the upper surface portion 73, and both side portions 82, 82 abut against both inner side surfaces 72, 72, so that the main body 81 fits into the upper part of the through hole 71. 61,61A are positioned in the thickness direction of the arch-shaped precast slab, and the tops 13, 23 are positioned in the circumferential direction by the fitting.

[0057] In addition, since a plurality of pressing means 85 are provided on the through hole end face side portion 171 and the through hole step face side portion 171A that divide the through hole 71, the main body 81 can be pressed evenly to align the through hole end face side portion 171 and the through hole step face side portion 171A in the thickness direction of the arch-shaped precast plate. [reference example 1]

[0058] 10 to 15 show the present invention. reference example 1 The same parts as those in the first embodiment are denoted by the same reference numerals, and their explanations will be omitted. This embodiment relates to a connecting structure 70A that can connect the ends of adjacent arch-shaped precast panels 11, 21 in the circumferential direction, or the end faces 12, 22 of adjacent arch-shaped precast panels 11, 21 in the width direction.

[0059] 10 and 11 show an example in which the abutting surfaces of the tops 13, 23, which are the ends of the arch-shaped precast slabs 11, 21 adjacent in the circumferential direction, are butted together and connected.

[0060] Figure 10 also shows an example in which the end faces 12, 12, 22, 22 of adjacent arch-shaped precast slabs 11, 11, 21, 21 in the width direction are butted together to connect them, and when the end faces 12, 12, 22, 22 of adjacent arch-shaped precast slabs 11, 11, 21, 21 are butted together, a connecting groove 110 is formed between the adjacent arch-shaped precast slabs 11, 11, 21, 21.

[0061] As shown in Figure 14, there is provided a connecting member 111, which is an attachment member that is inserted into the connecting groove 110 to connect adjacent arch-shaped precast slabs 11, 21. This connecting member 111 has a central connecting portion 112 that is shaped like a vertical plate with a constant thickness, and has approximately cylindrical spacing retaining portions 113, 113 integrally formed on both sides of this central connecting portion 112, and is made of a hard material such as metal.

[0062] The diameter, which is the thickness of the spacing portion 113, is larger than the thickness T of the longitudinal end portion 112T of the central connecting portion 112. The end portion 112T is the connecting point between the central connecting portion 112 and the spacing portion 113. If the spacing portion 113 is not cylindrical, the thickness of the spacing portion 113 is the maximum dimension of the central connecting portion 112 in the thickness direction.

[0063] In addition, the upper part of the connecting member 111 has a shape that narrows upward, and the upper part of the central connecting part 112 has inclined parts 114, 114 formed on both sides in the width direction, and the upper part of the spacing retaining part 113 has a truncated cone shape and has a tapered surface 115 that narrows upward.

[0064] Furthermore, a central upper surface portion 116A is formed on both inclined surfaces 114, 114, and a circular end upper surface portion 116B is provided on the upper portion of tapered surface 115. Central upper surface portion 116A and end upper surface portions 116B, 116B constitute upper surface portion 116 of connecting member 111, and central upper surface portion 116A and end upper surface portion 116B are located on the same plane. Furthermore, upper surface portion 116 of connecting member 111 and lower surface portion 117 of connecting member 111 are parallel to each other.

[0065] As shown in Figure 15, the embedded member 121 has a divided connecting groove 120 formed by dividing the connecting groove 110 at the abutment surface, and this embedded member 121 has an approximately rectangular parallelepiped shape and is made of a hard material such as metal, and is embedded and fixed in the arch-shaped precast slabs 11, 21 in correspondence with the abutment surface.

[0066] The divided connecting groove 120 includes a central groove portion 122 having a shape obtained by dividing the central connecting portion 112 into two portions, and a spacing groove portion 123 into which the spacing portion 113 is inserted, the divided connecting grooves 120 communicating with each other. By bringing the pair of embedding members 121, 121 together at their butt surfaces, the divided connecting grooves 120, 120 communicate with each other, forming a connecting groove 110 into which the connecting member 111 is fitted.

[0067] The central groove 122 has an abutment surface side opening 128 that opens to the abutment surface and an inner surface side opening 129 that opens to the inner surfaces 11U and 21U, and has a substantially constant width corresponding to the thickness of the central connecting portion 112. The abutment surface side opening 128 opens to the central surface 121S of the embedding member 121, and the inner surface side opening 129 opens to the lower surface 121K of the embedding member 121.

[0068] The spacing groove 123 is cylindrical in shape to correspond to the spacing portion 113. The upper portion of the central groove 122 is closed by an upper surface portion 126. The height of the connecting member 111 is equal to or greater than the depth of the connecting groove 110, and in this example, they are equal to each other.

[0069] Furthermore, when a joint is provided between the butting surfaces, as shown in Figure 13, a joint (gap) is provided between the central surfaces 121S, 121S, so the length of the central connecting portion 112 is twice the length of the central groove portion 122 plus the dimensions of the joint.

[0070] In this example, between adjacent arch-shaped precast slabs 11, 21 in the circumferential direction, from the upper side of Figure 11, two embedded members 121, 121 are fixed to the butt surfaces 65, 64A, two embedded members 121, 121 are fixed to the butt surfaces 64, 65A, and two embedded members 121, 121 are fixed to the butt surfaces 65, 64A.

[0071] 11, embedded members 121, 121 are fixed to end faces 12, 12 which are butting surfaces at the ends of arch-shaped precast slabs 11, 11 adjacent in the width direction, and adjacent arch-shaped precast slabs 11, 11 are connected at the end faces 12, 12. Embedded members 121, 121 are fixed to end faces 22, 22 which are butting surfaces at the ends of arch-shaped precast slabs 21, 21 adjacent in the width direction, and adjacent arch-shaped precast slabs 21, 21 are connected at the end faces 22, 22.

[0072] 10 and 13, the embedding member 121 has protruding insert bars 130 serving as fixing protrusions. In this example, the insert bars 130, 130 protrude outward from the left and right outer surfaces of the embedding member 121. The male thread portions of the insert bars 130 are screwed into female thread portions 130N formed on the outer surface of the embedding member 121 and fixed.

[0073] 13 and other figures, the embedded members 121 are provided with a retaining structure 131 that prevents the connecting member 111 fitted into the connecting groove 110 from slipping out. The retaining structure 131 has through holes 133, 133 drilled on both sides of a plate-shaped pressing member 132 that presses the underside 117 of the connecting member 111, and bolts 134, 134 serving as fixing means are inserted into these through holes 133, 133. Female screw portions 135 into which the bolts 134, 134 are screwed are formed on the undersides 121K of the embedded members 121, 121.

[0074] Furthermore, as a modified example, FIG. 2 As shown in FIG. 1, female screw holes 137, 137 serving as extraction member connecting portions are formed in the center of the spacing retaining portions 113, 113 on the underside 117 of the connecting member 111, and a bolt (not shown) serving as an extraction member with a male screw portion is screwed into this female screw hole 137, and the connecting member 111 can be pulled out of the connecting groove 110 by pulling the bolt.

[0075] During the connecting work, a connecting groove 110 is formed by embedded members 121, 121 located at the butt surfaces of adjacent arch-shaped precast slabs 11, 21, and the connecting member 111 is inserted into this connecting groove 110. During this insertion, the inclined portions 114, 114 and the tapered surface 115 allow for smooth insertion.

[0076] In addition, since the work can be done from the inner surface 11U, 21U side of the arch-shaped precast slabs 11, 21, the insertion work can be easily performed, and a connecting member 111, which is an attachment member, is attached to the arch-shaped precast slabs 11, 21 to prevent the adjacent end portions, i.e., the tops 13, 23, from shifting.

[0077] Furthermore, a secure connection state can be achieved by inserting the connecting member 111 into the connecting groove 110 until the lower surface 117 of the connecting member 111 is positioned at the lower surface 121K of the embedded member 121. Furthermore, after connection, the anti-detachment structure 131 can prevent the connecting member 111 from falling off.

[0078] Furthermore, partial repairs to the arch-shaped precast slabs 11, 21 may become necessary over time. For example, when replacing one arch-shaped precast slab 11, the retaining members 132 on the top 13 and both end faces 12, 12 can be removed, and a bolt (not shown) serving as an extraction member can be screwed into the female screw hole 137 on the exposed underside 117, and the bolt can be pulled to pull out the connecting member 111 from the connecting groove 110, thereby releasing the connection. Furthermore, the lower ends 11K, 21K of the arch-shaped precast slabs 11, 21 are released from fixation by the fixing means 6, and the connection to the concrete foundation 3 is released.

[0079] In this way, one arch-shaped precast slab 11 can be removed from between multiple parallel-arranged arch-shaped precast slabs 11, 11, etc., and after removal, a new arch-shaped precast slab 11 equipped with an embedded member 121 can be placed in the same location as the previous one, and the top 13 and both end faces 12, 12 can be connected to adjacent arch-shaped precast slabs 21, 11, 11 using connecting members 111 in the same way as for new installation.

[0080] In this way, reference In the example, when the butt surfaces 64, 65A, butt surfaces 65, 64, end surfaces 12, 12 as butt surfaces, and end surfaces 22, 22 as butt surfaces of the adjacent arch-shaped precast slabs 11, 21 are butted together, divided connecting grooves 120, 120 that form connecting grooves 110 spanning between the adjacent arch-shaped precast slabs 11, 21 are provided in the adjacent arch-shaped precast slabs 11, 21, and the divided connecting grooves 120 are formed by a central groove portion 122 that opens to the butt surfaces and the inner surfaces 11U, 21U of the arch-shaped precast slabs 11, 21, and interval grooves 120 that open to the inner surfaces 11U, 21U of the arch-shaped precast slabs 11, 21. The connecting member 111 has a retaining groove portion 123 and is inserted into the connecting groove 120 to connect adjacent arch-shaped precast slabs 11, 21, and this connecting member 111 integrally has a central connecting portion 112 that is inserted into the central groove portion 122 of adjacent arch-shaped precast slabs 11, 21 or adjacent arch-shaped precast slabs 11, 11, 21, 21 that are connected across the butt surface, and spacing retaining portions 113, 113 that are provided on both sides of the central connecting portion 112 and inserted into the spacing retaining groove portions 123 of the arch-shaped precast slabs 11, 21 to maintain the spacing between the spacing retaining groove portions 123, 123.

[0081] By adopting the above configuration, adjacent arch-shaped precast slabs 11, 21 or adjacent arch-shaped precast slabs 11, 11 or adjacent arch-shaped precast slabs 21, 21 can be connected by inserting a connecting member 111 into the connecting groove 110 spanning between the adjacent arch-shaped precast slabs 11, 21 while the butt surfaces of the adjacent arch-shaped precast slabs 11, 21 are butted together, making it possible to connect adjacent arch-shaped precast slabs 11, 21 or adjacent arch-shaped precast slabs 11, 11 or adjacent arch-shaped precast slabs 21, 21, which makes the connecting work easier and can be used to connect the ends of adjacent arch-shaped precast slabs 11, 21 in the circumferential direction and to connect adjacent arch-shaped precast slabs 11, 11, 21, 21 in the width direction, making it highly versatile.

[0082] In this way, reference In the example, an embedded member 121 having a dividing connecting groove 120 and a spacing retaining groove portion 123 is provided, and the embedded member 121 is embedded and fixed in the arch-shaped precast slab 11, 21. Therefore, by embedding and fixing the embedded member 121 in the arch-shaped precast slab 11, 21, the arch-shaped precast slab 11, 21 having the dividing connecting groove 120 and the spacing retaining groove portion 123 can be easily obtained.

[0083] In this way, reference In the example, the connecting member 111 is provided with a pressure member 132 that is placed on the inner surface 11U, 21U side of the arch-shaped precast slab 11, 21, and a bolt 134 that serves as a fixing means for fixing the pressure member 132 to the arch-shaped precast slab 11, 21, so that the pressure member 132 can prevent the connecting member 111 from coming out after connection.

[0084] reference As an example effect, the upper part of the connecting member 111 has a shape that tapers from the inner surface 11U side toward the outer surface 11G side, and the shape tapers upward, so that the connecting member 111 can be smoothly press-fitted into the connecting groove 110. Furthermore, if the height of the connecting member 111 is equal to the depth of the connecting groove 110, and the connecting member 111 is press-fitted until the lower surface portion 117 of the connecting member 111 is positioned on the lower surface 121K of the embedding member 121, it can be confirmed that the upper surface portion 116 of the connecting member 111 has reached the upper surface portion 126 of the connecting groove 110.

[0085] Furthermore, the embedded member 121 is provided with insert bars 130 as protrusions for protrusions, so that the embedded member 121 can be fixed integrally to the concrete arch-shaped precast slabs 11, 21.

[0086] Furthermore, a detachable pressing member 132 that presses the underside 117 of the connecting member 111 is provided, so that the connecting member 111 can be prevented from slipping out, and the connecting member 111 can be pulled out by removing the pressing member 132. At this time, the connecting member 111 can be easily pulled out using the female screw hole 137 that serves as the pulling member connection portion.

[0087] Furthermore, since the connecting member 111 has a shape that is symmetrical with respect to the central plane in the thickness direction and the central plane in the length direction, when inserting the connecting member 111 into the connecting groove 110, the insertion operation can be easily performed without having to worry about the orientation of the connecting member 111. [Example]

[0088] FIG. 16 shows an embodiment of the present invention. 2 1 shows a cross section of an arched tunnel 31, which has an existing arched structure 32 assembled in an arch shape, and the inner surface of this arched structure 32 is the inner surface 33 of the existing tunnel 31.

[0089] Side walls 35, 35 are constructed, for example, using cast-in-place concrete, at the bottom of the left and right inner surfaces 33 of the tunnel 31 that rise above the road surface 34. In addition, a pair of left and right arch-shaped precast slabs 11, 21 made of precast concrete are assembled and installed in an arch shape on the inner surface 33 of the arch-shaped tunnel 31 as decorative slabs having a shape that divides the tunnel 31 into two in the circumferential direction, and the lower ends 11K, 21K of each arch-shaped precast slab 11, 21 are supported by the side walls 35, 35, respectively, and the upper ends of each arch-shaped precast slab 11, 21 abut against each other. edge 1A hardening agent 43 such as concrete or mortar is filled in the space between 1K, 21K and the upper surface 53J of the side wall portion 35. As the hardening agent 43 hardens, the lower ends of the precast slabs 11, 21 are rigidly connected to the side wall portions 35, 35, forming an arched hollow structure 36 comprising the left and right arched precast slabs 11, 21 and the side wall portions 35, 35. The side wall portions 35, 35 are mounting portions for attaching the lower portions of the arched precast slabs 11, 21. 35U is the inner surface of the side wall portion 35, and 35J is the upper surface of the side wall portion 35.

[0090] The arch-shaped precast slabs 11 and 21 on one side and the other side (right and left) are arranged in parallel along the tunnel length direction with the tunnel length direction aligned with the width direction, and the end faces 12 and 22 at both ends in the width direction are butted against each other. The arch-shaped precast slabs 11 and 21 are formed to have the same width along the tunnel length direction. The arch-shaped precast slabs 11 and 21 are similar to those in Example 1 and Reference example 1 Similarly, they are connected by connecting structures 70 and 70A.

[0091] In this way, in this embodiment, in the connection structure of arch-shaped precast slabs 11, 21, which are connected by butting together the tip butt surface 64 and the base butt surface 65A, which are the butt surfaces of the adjacent end portions or peaks 13, 23, the base butt surface 65 and the tip butt surface 64A, the end surfaces 12, 12, which are butt surfaces, and the end surfaces 22, 22, which are butt surfaces, a connecting member 111 is provided as an attachment member that is attached to the precast slabs 11, 21 from the inner surface 11U, 21U side of the precast slabs 11, 21 to prevent misalignment of the adjacent peaks 13, 23.Therefore, by attaching the connecting member 111 from the inner surface 11U, 21U side of the precast slabs 11, 21, misalignment of the adjacent peaks 13, 23 can be prevented.

[0092] In this way, in this embodiment, in the connecting structure of the arch-shaped precast slabs for tunnels, which are installed on the inner surface 33 of the arch-shaped tunnel 31 and are connected by butting together the tip butt surface 64 and the base butt surface 65A, which are the butt surfaces of the adjacent end portions of the apexes 13, 23, and the base butt surface 65 and the tip butt surface 64A, in order to prevent the adjacent apexes 13, 23 from shifting, bolts 88 are provided as mounting members that are attached to the arch-shaped precast slabs 11, 21 from the inner surface 11U, 21U side of the arch-shaped precast slabs 11, 21, and by attaching the bolts 88 from the inner surface 11U, 21U side of the arch-shaped precast slabs 11, 21, it is possible to prevent the adjacent apexes 13, 23 from shifting.

[0093] In this embodiment, in the connection structure of the arch-shaped precast slabs for the tunnel, which are installed on the inner surface 33 of the arch-shaped tunnel 31 and are connected by butting the tip butt surface 64 and the base butt surface 65A, which are the butt surfaces of the apexes 13 and 23, which are the butt surfaces of the adjacent ends, and the base butt surface 65 and the tip butt surface 64A, the arch-shaped precast slabs 11 and 21 are divided in the circumferential direction of the tunnel 31, and the ends of one and the other arch-shaped precast slabs 11 and 21 adjacent in the circumferential direction are connected by a convex portion. 61,61A and recess 62,62A The protrusions and recesses fit together, and the protrusions of the tops 13, 23 of the arch-shaped precast plates 11, 21 on one side and the other side. 61,61AA bolt member 80 is inserted into the through hole 71 that is continuous in the width direction of the arch-shaped precast slabs 11 and the other arch-shaped precast slabs 11, 21, and the tops 13, 23 are connected to each other by this bolt member 80. The bolt member 80 is loosely inserted into the through hole 71 so as to be movable from the inner surface 11U, 21U side to the outer surface 11G, 21G side of the arch-shaped precast slabs 11, 21, and an upper surface portion 83 is provided on the outer surface 11G, 21G side of the arch-shaped precast slabs 11, 21 as an abutment portion that abuts against the upper surface portion 73 that is on the outer surface 11G, 21G side of the arch-shaped precast slabs 11, 21 of the continuous through hole 71, and a pressing means 85 is provided for pressing the bolt member 80 toward the outer surface 11G, 21G of the arch-shaped precast slabs 11, 21.

[0094] Since the above-mentioned configuration is adopted, when the bolt member 80 is pressed toward the outer surfaces 11G, 21G of the arch-shaped precast slabs 11, 21 by the pressing means 85, the upper surface portion 83 of the bolt member 80 contacts the convex portions of both the arch-shaped precast slabs 11, 21. 61,61A The upper surface 73 of the through hole 71 is in contact with the upper surface 73 of the through hole 71. 61,61A The through hole 71 extending between the two protrusions is pressed by the bolt member 80. 61,61A The inner and outer surface directions (thickness direction) of the arch-shaped precast slabs 11 and 21 are aligned, thereby preventing the occurrence of a step between the ends of one and the other arch-shaped precast slabs 11 and 21 that are adjacent in the circumferential direction.

[0095] In this embodiment, the tunnel is installed on the inner surface 33 of the arched tunnel 31, and the ends of the adjacent apexes 13 and 23 are butted together. Butt surface 64 and base end abutment surface 65A , butt surface, base end butt surface 65 and tip abutment surface 64AIn a connection structure of arch-shaped precast slabs 11, 21 for a tunnel that are connected by butting together, or in a connection structure of precast slabs for a tunnel that are installed on the inner surface 33 of an arch-shaped tunnel 31 and connected by butting together end faces 12, 12, 22, 22 that are butting faces of adjacent ends, dividing connecting grooves 120, 120 that form a connecting groove 110 spanning between adjacent precast slabs 11, 21 are provided in adjacent precast slabs 11, 21 in a state where the butting faces of adjacent precast slabs 11, 21 are butted together, and the dividing connecting groove 120 is formed between the butting faces and the inner surfaces 11U, 21U of the precast slabs 11, 21. The connecting member 111 has a central groove 122 that opens to the inner surface 11U, 21U of the precast slabs 11, 21, and a spacing groove 123 that opens to the inner surface 11U, 21U of the precast slabs 11, 21, and is inserted into the connecting groove 120 to connect adjacent precast slabs 11, 21.The connecting member 111 integrally has a central connecting portion 112 that is inserted into the central groove 122 of adjacent precast slabs 11, 21 or adjacent precast slabs 11, 11, 21, 21 that are connected across the butt surface, and spacing grooves 113, 113 that are provided on both sides of the central connecting portion 112 and inserted into the spacing grooves 123 of the precast slabs 11, 21 to maintain the spacing between the spacing grooves 123, 123.

[0096] By adopting the above configuration, adjacent precast slabs 11, 21 or adjacent precast slabs 11, 11 or adjacent precast slabs 21, 21 can be connected by inserting a connecting member 111 into the connecting groove 110 spanning between the adjacent precast slabs 11, 21 while the butt surfaces of the adjacent precast slabs 11, 21 are butted together, making it possible to connect adjacent precast slabs 11, 21 or adjacent precast slabs 11, 11 or adjacent precast slabs 21, 21, which makes the connecting work easier and can be used to connect the ends of adjacent precast slabs 11, 21 in the circumferential direction and to connect adjacent precast slabs 11, 11, 21, 21 in the width direction, making it highly versatile.

[0097] In this way, in this embodiment, claims 1 to 3 Corresponding to the above Memorial Example 1 and Reference Example 1 It has the same action and effect.

[0098] The present invention is not limited to the present embodiment, and various modifications are possible within the scope of the present invention. and reference examples In the above, an arch-shaped precast slab divided into two parts is exemplified, but it may be divided into three or more parts. Also, a connecting structure 70A may be provided between the step surfaces that are the butt surfaces of adjacent arch-shaped precast slabs. Furthermore, the shape of the connecting member can be appropriately selected, such as by making the spacing portion a plate-like shape that intersects with the central connecting portion, and making the cross section approximately H-shaped, and the connecting groove may also be shaped to correspond to the connecting member. Also, in the embodiment, 2 In the example above, an arch-shaped precast slab is installed on the inner surface of an existing tunnel, but the inner surface of the existing tunnel may be partially or entirely chipped and then the arch-shaped precast slab installed, or the existing tunnel may be widened and then the arch-shaped precast slab installed. In addition, the shapes of the convex and concave portions at the top can be selected as appropriate as long as they fit together. [Explanation of symbols]

[0099] 11 Arch-shaped precast slab (one side) 12 End face (butting surface of end) 13 Top (end) ) 2 1 Arch-shaped precast plate (left and right) 22 End face (butting surface of end) 23 Top (end) ) 6 1 Convex part 61A Convex part 62 recess 62A Recess 64 Tip butt surface (butt surface) 64A Tip butt surface (butt surface) 65 Base end butt surface (butt surface) 65A Base end butt surface (butt surface) 70,70A connection structure 73 Top surface (outer surface of arch-shaped precast plate of through hole) 80 Bolt member 81 Main Unit 81N male thread part 83 Upper surface (contact part, outer surface of arched precast plate of main body) 84 Underside (inner surface of arched precast plate of main body) 85 Pressing means 88 Bolts (mounting parts) 90 Nut (fixing means) 110 Connection groove 111 Connecting member (mounting member) 112 Central connection section 113 Spacing holding part 120 Split connection groove 121 Embedded parts 122 Central groove 123 Spacing groove 128 Butt surface opening 129 Inner opening 131 Anti-slip structure 134 Bolts (fixing means)

Claims

1. In a connecting structure of arch-shaped precast slabs, the butt surfaces of adjacent ends are butted together to form an arch shape. and a mounting member attached to the arch-shaped precast plate from the inner surface side of the arch-shaped precast plate to prevent the adjacent ends from shifting. The arch-shaped precast plates are divided in the circumferential direction, and the ends of one and the other adjacent arch-shaped precast plates in the circumferential direction are fitted together by a convex portion and a concave portion, and through holes are formed in the width direction of the arch-shaped precast plates that are continuous with the convex portions of the ends of the one and the other arch-shaped precast plates, and bolt members are inserted into the through holes that are continuous with the width direction of the one and the other arch-shaped precast plates, and the ends are connected to each other by the bolt members, A connecting structure for arch-shaped precast slabs, characterized in that the bolt member is loosely inserted into the through hole so as to be able to move from the inner side to the outer side of the arch-shaped precast slab, and the outer side of the arch-shaped precast slab is provided with an abutment portion that abuts against the outer side of the arch-shaped precast slab of the continuous through hole, and a pressing member is provided as the mounting member that presses the bolt member toward the outer side of the arch-shaped precast slab.

2. The bolt member includes a main body provided with the abutment portion and male screw portions provided on both ends of the main body, The connecting structure of arch-shaped precast slabs as described in claim 1, characterized in that a recess communicating with the through hole is formed on the inner surface of the end, and a nut is screwed onto the male thread portion protruding into this recess.

3. The bolt member includes a main body provided with the abutment portion and male screw portions provided on both ends of the main body, a female screw hole is provided between the inner surface of the arch-shaped precast plate and the through hole; 2. The connecting structure of arch-shaped precast slabs according to claim 1, wherein the pressing member is a bolt that is threaded into the female screw hole and whose tip side abuts against the inner surface of the arch-shaped precast slab of the main body.

Images