Closing structure for bolt box of segment and closing method

Abstract

To provide a closing structure and a closing method for a bolt box of a segment, which has no risk of falling of a closing member for closing the bolt box and has excellent closing efficiency.SOLUTION: A closing structure 100 for a bolt box provided in a segment 10 in which bolts 30 for bolt-joining adjacent segments 10, 10 are arranged, comprises: a shaft body 41 that is fixed directly or indirectly to a bottom surface 12 on the natural ground side of a bolt box 20 and protrudes into an interior of the bolt box 20; a block body 50 that has a through hole 55 through which the shaft body 41 is inserted; and a fixing member 45 that fixes the block body 50 in which the shaft body 41 passes through the through hole 55, to the shaft body 41. The block body 50 is accommodated and fixed inside the bolt box 20, thereby closing the interior of the bolt box 20.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a closing structure and a closing method for a segment bolt box.

Background Art

[0002] For segment joints and ring joints of steel segments or concrete segments (RC (Reinforced Concrete) segments, or composite segments in which a steel shell and concrete are combined), there are various types of joints, such as so-called one-pass joints and joints using bolt boxes. Among them, the joint using a bolt box is a joint that can firmly connect segments to each other by bolt connection using a bolt box when fluid pressure or the like acting from the inside of the tunnel toward the radially outer side acts on the segments in a sewer tunnel, a rainwater tunnel, etc., and a circumferential tensile force (ring tension) is generated in the segments due to this fluid pressure.

[0003] When joining adjacent segments by a segment joint provided with a bolt box, for example, an insert nut is provided in the segment joint of one segment, and a bolt box is provided in the segment joint of the other segment. Among the bolt boxes, bolt holes are provided on the side surface facing the segment joint surface, and bolts are tightened against the bolt holes communicating with each other from the inside of the bolt box and the insert nut. There are, for example, a plurality of combinations of corresponding insert nuts and bolt holes. After tightening bolts against all the insert nuts, a consolidating material or the like is filled into the inside of the bolt box to close it. In this way, by closing the inside of the bolt box with a consolidating material or the like, it is possible to prevent rainwater, sewage, etc. in the tunnel from flowing into the inside of the bolt box.

[0004] However, in a structure where the inside of the bolt box is blocked by a solidifying material or the like, for example, when the bolt box is located above the spring line of the tunnel, if the adhesiveness of the solidifying material or the like that blocks the bolt box is small compared to its weight, there is a risk that the adhesion between the solidifying material or the like and the bolt box will peel off and fall off. Therefore, in order to reliably prevent the solidifying material or the like from falling off due to such peeling, a special material is selected as the solidifying material, or a laborious construction method is considered. However, new problems will arise, such as the time and cost required for the selection of such materials and construction methods and the construction itself. Furthermore, since it takes time to fill the inside of the bolt box with a solidifying material or the like over time and to plaster a corrosion-resistant mortar layer on the inner surface (inner surface of the tunnel) of the bolt box as needed, the workability during the blocking construction is a problem. As the bolt box becomes larger, this problem becomes more prominent. From the above, a blocking structure and a blocking method for the bolt box of the segment are desired, which have no risk of falling of the blocking member for blocking the bolt box and are excellent in blocking efficiency.

[0005] Here, Patent Document 1 proposes a blocking structure for a joint recess in a concrete segment. This blocking structure aligns the joint members embedded in the joint end faces of the connecting concrete segments, and after fastening these joint members together with bolts that penetrate both joint members from one of the joint recesses formed inside both joint members, each joint recess is blocked substantially flat along the inner surface of the segment in which the joint recess is formed. The opening peripheral edge of the joint recess is formed in a substantially rectangular shape, and an engaging portion is provided by forming an undercut-shaped notch that extends toward the bottom side of the joint recess on one set of opposite side portions of this peripheral edge. After arranging the disk-shaped blocking lid in the opening and rotating it substantially 90 degrees along the inner surface of the segment, the peripheral portion of the blocking lid is engaged with the engaging portion, and in this state, the surface of the blocking lid is substantially flush with the inner surface of the segment.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] The closing structure described in Patent Document 1 arranges a disc-shaped closing lid at the opening and then rotates it approximately 90 degrees along the inner surface of the segment so that the peripheral portion of the closing lid engages with the engaging portion. However, when the bolt box is of a general rectangular parallelepiped box type, it is extremely difficult to close it by rotating the closing lid in this way. Therefore, it is considered unsuitable for application to a general bolt box. Further, in Patent Document 1, it is stated that the inside of the lid is filled with mortar. However, especially when filling mortar in an upward operation, it is extremely difficult to fill the mortar without gaps, and air pockets often occur in the upper part. Also, especially when filling mortar in an upward operation, leakage when filling the mortar is a problem, and it will require a lot of labor for curing and cleaning of the segment. In addition, since the filling of mortar into the bolt box is often carried out after shield tunneling, there are also problems such as the difficulty of transporting the mortar material into the pit, the treatment of remaining mortar, and the drainage treatment after cleaning the working fluid and filling equipment. Furthermore, the installation of concrete blocks can be easily carried out by shield work in parallel with shield tunneling as a series of operations of shield tunneling. However, due to the above problems in mortar filling, it cannot be carried out in parallel with shield tunneling, and thus there is also a problem that an additional process is required.

[0008] An object of the present invention is to provide a closing structure and a closing method for a bolt box of a segment that have no risk of dropping of a closing member for closing the bolt box and are excellent in closing efficiency.

Means for Solving the Problems

[0009] To achieve the above object, one aspect of the closing structure of the bolt box of the segment according to the present invention is a closing structure of a bolt box provided in a segment, in which bolts for bolt-joining adjacent segments are arranged, a shaft body that is directly or indirectly fixed to the bottom surface on the ground side of the bolt box and protrudes into the bolt box, and a block body having a through hole through which the shaft body is inserted, and a fixing member that fixes the block body, through which the shaft body passes through the through hole, to the shaft body. The inside of the bolt box is characterized in that the block body is housed and fixed inside the bolt box, thereby closing the inside of the bolt box.

[0010] According to this aspect, since the shaft body protruding into the bolt box passes through the through hole of the block body and the fixing member fixes the block body to the shaft body to close the inside of the bolt box, there is no risk of the closing member for closing the bolt box falling, and it becomes a closing structure with excellent closing efficiency when closing the bolt box. Here, examples of the segment provided with the bolt box include a steel segment, a concrete-based segment (including a composite segment), etc., and also include a segment in which a secondary lining of resin mortar (anticorrosive mortar) is provided on the inner surface (tunnel inner surface) of the segment. When the tunnel is a rainwater tunnel, a sewage tunnel, a water storage tunnel, etc., the secondary lining of resin mortar provided on the surface forms an anticorrosive layer, and the resin mortar contributes to smooth water flow by ensuring the smoothness of the surface.

[0011] In addition, "the shaft body is directly or indirectly fixed to the bottom surface on the ground side" means, for example, in addition to the form in which the end of the shaft body is directly fixed by welding or the like to the bottom surface on the ground side (for example, the inner surface of the steel shell) in a steel segment (including a steel segment filled in concrete), a nut is welded or the like to the bottom surface on the ground side, and the end of the shaft body is screwed into the nut and fixed, or a nut is embedded inside the RC segment, and the end of the shaft body is screwed into the nut and fixed, thereby indirectly fixing the shaft body to the bottom surface.

[0012] Another aspect of the closing structure of the bolt box of the segment according to the present invention is A plurality of the block bodies are stacked in a state where their respective through holes are communicated and accommodated inside the bolt box, and the shaft body penetrates through the communicated through holes of the plurality of block bodies. The shaft body is a threaded bolt. The fixing member is a fixing nut. Characterized in that one of the fixing nuts is tightened against the threaded bolt passing through the plurality of stacked block bodies, thereby fixing all the block bodies.

[0013] According to this aspect, since all the block bodies are fixed by tightening the fixing nut against the threaded bolt passing through the block bodies, the installability of the block bodies can be improved. Furthermore, since the block bodies closing the bolt box are a plurality of block bodies, the weight of one block body can be reduced, which also contributes to the good installability of the block bodies.

[0014] Another aspect of the closing structure of the bolt box of the segment according to the present invention is A plurality of the block bodies are stacked in a state where their respective through holes are communicated and accommodated inside the bolt box, and the shaft body penetrates through the communicated through holes of the plurality of block bodies. The shaft body is a threaded bolt. The fixing member is a fixing nut. A counterbore groove is provided around the through hole in the block body. For each of the block bodies, the threaded bolt passing through the through hole is tightened with the dedicated fixing nut, and the fixing nut is accommodated in the counterbore groove, and each block body is fixed with the dedicated fixing nut.

[0015] According to this aspect, in addition to the fact that the block bodies closing the bolt box are a plurality of block bodies, since each block body is fixed with a dedicated fixing nut, the block bodies can be stacked while being sequentially fixed, so that in the segment located above the tunnel, it is possible to surely prevent the block bodies from falling when being installed. Further, since each block body has a counterbore groove and the fixing nut is accommodated in the counterbore groove, the thickness of the fixing nut is not added to the height in the stacking direction when stacking the block bodies, and the block bodies can be stacked in a butted posture.

[0016] Another aspect of the closing structure of the bolt box of the segment according to the present invention is The threaded bolt is a full-thread bolt. A base nut is fixed to the steel bottom surface. The shaft body formed by the full-thread bolts is screwed to the base nut.

[0017] According to this aspect, since the shaft body formed by full-thread bolts (an example of a threaded bolt) is screwed to the base nut fixed to the bottom surface, when bolt-joining an adjacent segment using the bolt box, the shaft body is not installed inside the bolt box, and after bolt-joining, the shaft body is installed on the base nut and the bolt box can be closed with the block body, it is possible to prevent the shaft body from inhibiting the workability of bolt-joining.

[0018] Another aspect of the closing structure of the bolt box of the segment according to the present invention is A filler is filled in the gap between the inside of the bolt box and the block body.

[0019] According to this aspect, although the inside of the bolt box is blocked by the block body, since the gap that may occur between the block body and the bolt box is filled with a filler, the block body and the bolt box can be integrated to prevent the block body from falling, the loosening of the nut caused by the movement of the block body can be prevented, the intrusion of water can be prevented, and the rust of the bolt can be suppressed.

[0020] Another aspect of the method for closing the bolt box of the segment according to the present invention is a method for closing the bolt box of a segment, in which bolts for bolt-joining adjacent segments are arranged, a step A of bolt-joining adjacent segments with the bolts using both of the bolt boxes; a step B of directly or indirectly fixing a shaft body to the bottom surface on the ground side of the bolt box and projecting the shaft body into the bolt box; a step C of passing the shaft body through the through hole of a block body having a through hole, accommodating the block body in the bolt box, fixing the block body to the shaft body with a fixing member, and closing the inside of the bolt box with the block body.

[0021] According to this aspect, since a shaft body is projected into the bolt box, the shaft body is passed through the through hole of the block body, the block body is accommodated in the bolt box and fixed with a fixing member, and the inside of the bolt box is closed by the block body, there is no risk of the closing member for closing the bolt box falling, it has high construction safety, and it is a closing method excellent in efficiency when closing the bolt box.

[0022] Another aspect of the method for closing the bolt box of the segment according to the present invention is It further has a step D of filling a filler into at least the gap between the inside of the bolt box and the block body, which is characterized in that.

[0023] According to this aspect, by filling the filler into the gap that may occur between the block body and the bolt box, the fine gap can be completely blocked by the filler, and rust of the bolt due to the gap around the bolt being filled with water can be prevented.

[0024] Another aspect of the method for closing the bolt box of the segment according to the present invention is On the inner side of the tunnel of the area other than the bolt box among the segments, a secondary lining with a smooth surface is provided. It further has a step E of forming a secondary lining with a smooth surface on the inner side of the tunnel of the bolt box, which is characterized in that.

[0025] According to this aspect, by forming a secondary lining with a smooth surface on the inner side of the tunnel of the bolt box, when the tunnel is a sewage tunnel, a rainwater tunnel, or a storage tunnel, smooth water flow can be guaranteed by the smoothness of the surface.

[0026] Another aspect of the method for closing the bolt box of the segment according to the present invention is Fix the base nut using a positioning gauge with respect to the bottom surface of the bolt box. The positioning gauge When installed on the bottom surface of the bolt box, it has a position defining portion that defines the position where the base nut should be fixed. Position the base nut in the position defining portion and fix it to the bottom surface. In the step B, it is characterized in that a threaded bolt, which is the shaft body, is screwed and fixed to the base nut fixed to the bottom surface.

[0027] According to this aspect, by fixing the base nut using a positioning rule, the shaft body can be projected in the correct position and in the correct upright posture inside the bolt box. Also, after bolt-joining the segments using the bolt box, the end of the shaft body is fixed to the base nut, and the block body is fixed to the shaft body to close the inside of the bolt box. Therefore, compared with the case where the shaft body is welded to the bottom surface in advance, it is possible to prevent the shaft body from interfering with the bolt during bolt-joining, and it is possible to achieve both smooth bolt-joining and closing of the bolt box.

Effect of the Invention

[0028] According to the closing structure and closing method of the bolt box of the segment of the present invention, there is no risk of the closing member for closing the bolt box falling, and it is possible to close the bolt box of the segment with excellent closing efficiency.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12A

Figure 12B

Figure 12C

Figure 12D

Figure 12E

Figure 12F

Figure 12G

Figure 12H

Figure 12I

Mode for Carrying Out the Invention

[0030] Hereinafter, the closing structure and closing method of the bolt box of the segment according to the embodiment will be described with reference to the accompanying drawings. In the present specification and drawings, substantially the same components may be denoted by the same reference numerals, and redundant descriptions may be omitted.

[0031] [Closing Structure of Bolt Box of Segment According to Embodiment] First, with reference to FIGS. 1 to 11, an example of the closing structure of the bolt box of the segment according to the embodiment will be described. Here, FIG. 1 is a diagram showing a state in which a plurality of segments each having a bolt box to be constructed are assembled in the circumferential direction. FIG. 2 is a perspective view showing a state in which the bolt box of the B segment is closed by a plurality of block bodies, and FIG. 3 is a side view of an example of the shaft body. FIG. 4 is a perspective view of an example of the block body, FIG. 5 is a perspective view showing a state in which a gap between the bolt box of the B segment and the block body is filled with a filler to form the closing structure of the embodiment, and FIG. 6 is a perspective view showing a state in which a secondary covering work with resin mortar is being constructed inside the bolt box of the B segment. Further, FIG. 7 is a perspective view showing a state in which the bolt box of the K segment is closed by a plurality of block bodies, FIG. 8 is a perspective view showing a state in which a gap between the bolt box of the K segment and the block body is filled with a filler to form the closing structure of the embodiment, and FIG. 9 is a perspective view showing a state in which a secondary covering work with resin mortar is being constructed inside the bolt box of the K segment.

[0032] The example shown in FIG. 1 shows a state in which the K segment 10B, the B segment 10A, and the A segment 10C, which are steel segments, are arranged in order from the right side, and a bolt 30 inserted through the bolt hole 15a of the segment joint plate 15 of one bolt box 20 is inserted through the bolt hole 15a of the segment joint plate 15 provided on the other side and further screwed into an insert nut (not shown) to be bolted to each other while forming a segment joint.

[0033] In the illustrated example, three bolt boxes 20 are provided via two main girders 14 at one circumferential end or the left and right ends of segment 10. In FIG. 1, the head 32 of the bolt 30 inserted from the bolt box 20 of the K segment 10B is visible. Each bolt box 20 will be closed by the closing structure according to the embodiment.

[0034] Each segment 10 includes a steel shell 11 with a skin plate on the back, a plurality of curved main girders 14 extending in the circumferential direction, a pair of ring joint plates 16 parallel to the main girders 14, and a pair of segment joint plates 15 connecting the ends of each ring joint plate 16 and the main girders 14. The B segment 10A and the A segment 10C are provided with a plurality (three in the illustrated example) of bolt boxes 20 at one circumferential end. In contrast, the K segment 10B, which is installed last and connected to the left and right B segments 10A, is provided with a plurality (three in the illustrated example) of bolt boxes 20 at the left and right circumferential ends respectively.

[0035] As shown in FIG. 2, two shaft bodies 40 project from one bolt box 20, and three block bodies 50 are fixed to the two shaft bodies 40, so that almost the entire area of the bolt box 20 is blocked by the block bodies 50.

[0036] Here, as shown in FIG. 3, the shaft body 40 has a fully threaded bolt 41 (an example of a bolt with threads) and a plurality (three in the illustrated example) of fixing nuts 45 (an example of a fixing member) that are screwed onto the fully threaded bolt 41. Each fixing nut 45 is configured to fix the corresponding block body 50 to the fully threaded bolt 41.

[0037] On the one hand, as shown in FIG. 4, the block body 50 is, for example, a plate-shaped block made of concrete. Among its wide surfaces, through holes 55 are provided at positions corresponding to two shaft bodies 40 protruding into the inside of the bolt box 20, and a counterbore groove 56 is provided in a region where the through holes 55 face the wide surface. On the side of the through holes 55, a straw insertion through hole 57A into which a straw S (see FIG. 12F etc.) of a filling device M for filling the filler 60 is inserted, and an air vent through hole 57B for venting air when the filler 60 is filled are provided.

[0038] Also, among the block bodies 50, two recesses 53 are provided on one side surface. This recess 53 is a groove for accommodating the head 32 of the bolt 30 that connects the segments, and interference between the block body 50 accommodated inside the bolt box 20 and the head 32 of the bolt 30 is prevented.

[0039] Two full-thread bolts 41 protrude into the inside of the bolt box 20. After accommodating the block body 50 in the bolt box 20 while passing the two full-thread bolts 41 through the two through holes 55, by tightening the fixing nuts 45, the block body 50 is fixed to the two shaft bodies 40. At this time, since the fixing nuts 45 are accommodated in the counterbore grooves 56, while preventing the fixing nuts 45 from protruding outside the wide surface of the block body 50, the block body 50 is fixed to the full-thread bolts 41 with the fixing nuts 45.

[0040] By sequentially passing through and fixing three block bodies 50 to the two shaft bodies 40, three block bodies 50 can be installed inside the bolt box 20 as shown in FIG. 2.

[0041] As shown in Fig. 5, a filling material 60 is filled in a slight gap that may occur between the inner wall surface of each bolt box 20 and each block body 50, thereby forming a closing structure 100 of the bolt box. More specifically, the filling material 60 is also filled inside the seat grooves 56 of the block bodies 50 adjacent to each other in the stacked posture, etc., and the gaps existing inside the bolt box 20 are completely closed by the filling material 60.

[0042] Here, examples of the filling material 60 include non-shrinking mortar, rigid urethane foam, etc., and its specific material is determined by, for example, the size of the region where the filling material 60 is filled.

[0043] According to the closing structure 100, after closing many regions inside the bolt box 20 with a plurality of block bodies 50, the slightly generated gaps are closed with the filling material 60, thereby realizing efficient closing of the bolt box 20.

[0044] Also, by sequentially fixing a plurality of block bodies 50 to the shaft body 41(40) protruding inside the bolt box 20 using unique fixing nuts 45, it is possible to prevent the block bodies 50 from falling during installation, and realize a closing construction of the bolt box 20 with high construction safety. At this time, since the plurality of block bodies 50 are sequentially installed, it is possible to prevent the weight of the block bodies from becoming too heavy, the installability of the block bodies 50 is also improved, and excellent workability can be realized.

[0045] Furthermore, it is preferable that the filling material 60 is filled in the gap that may occur between the block body 50 and the inner wall surface of the bolt box 20 and the fine gap is completely closed, so as to prevent the bolt 30 from rusting due to the gap around the bolt 30 being filled with water.

[0046] As shown in Fig. 5, inside the segment 10, except for the area outside the bolt box 20, a secondary covering layer 18 made of, for example, resin mortar is provided. Therefore, as shown in Fig. 6, by constructing a secondary covering layer 70 made of resin mortar, for example, by plastering, so as to close the inside of each bolt box 20, a segment 10 (B segment 10A) with a smooth inner surface where the surfaces of the secondary covering layers 18 and 70 are flush is formed. Note that the secondary covering layer 18 may be constructed with a material other than resin mortar.

[0047] On the other hand, as shown in Figs. 7 to 9, in the K segment 10B having a plurality (three in the illustrated example) of bolt boxes 20 at the left and right ends in the circumferential direction, similar to the closing structure 100 in the B segment 10A already described with reference to Figs. 2 to 6, each bolt box 20 is closed by a plurality of block bodies 50 and a filler 60 to form a closing structure 100, and a secondary covering layer 70 is constructed inside. Although not shown, the closing structure 100 of the bolt box is formed in the same manner for other A segments 10C.

[0048] Next, with reference to Figs. 10 and 11, a method of welding a base nut 48 for fixing the shaft body 40 to the bottom surface 12 of the bolt box 20 will be described. Here, Fig. 10 is a diagram for explaining a method of fixing the base nut using a positioning gauge on the bottom surface of the bolt box, and Fig. 11 is a diagram showing a state where the base nut is fixed to the bottom surface of the bolt box and a state where the shaft body fixed to the base nut penetrates through the through hole of the block body.

[0049] When welding and joining the base nut 48 to a predetermined position on the bottom surface 12 of the bolt box 20 in a correct posture (a posture that ensures that the shaft body 40 to be screwed protrudes into the bolt box 20 in a correct standing posture), a positioning gauge J as shown in Fig. 10 is used.

[0050] The positioning template J includes a position - defining plate J1, a standing piece J2 fixedly installed in an upright posture on the wide surface of the position - defining plate J1, and a cylindrical body J3 fixedly installed along the end of the standing piece J2 and through which a shaft body such as a bolt is inserted.

[0051] The outer - contour shape of the position - defining plate J1 has the same shape as a part of the contour shape of the bottom surface 12 of the bolt box 20. On one end - side of the position - defining plate J1, two position - defining portions J1a that define the installation positions of the two base nuts 48 are provided. Also, the cylindrical body J3 fixed to the standing piece J2 is disposed directly above the position - defining portion J1a.

[0052] As shown in FIG. 10, the position - defining plate J1 is installed such that its contour contacts a part of the bottom surface 12 of the bolt box 20. The base nuts 48 are placed on each position - defining portion J1a on the bottom surface 12, and the base nuts 48 are welded to the bottom surface 12.

[0053] In this way, by using the positioning template J to weld - join the base nuts 48 to the bottom surface 12, the base nuts 48 can be fixed at the exact positions on the bottom surface 12.

[0054] By this attachment method, as shown in FIG. 11, two base nuts 48 are welded - joined to a predetermined position on the bottom surface 12 of the bolt box 20. Here, FIG. 11 shows a state where two base nuts 48 are welded - joined to the bottom surface 12 of the central bolt box 20. Further, in another separate bolt box 20 beside it, the ends of the all - thread bolts 41 are screwed into two base nuts 48 (not shown) and stand upright, and a block body 50 through which the two all - thread bolts 41 penetrate the through - holes 55 is accommodated inside the bolt box 20.

[0055] In this way, by using the positioning template J to fix the base nuts 48 at a predetermined position on the bottom surface 12 of the bolt box 20, the shaft body 40 can be projected in the correct position and in the correct upright posture inside the bolt box 20.

[0056] Also, after bolt - joining the segments using the bolt box 20, by fixing the end of the shaft body 40 to the base nut 48 and fixing the block body 50 to the shaft body 40 to close the inside of the bolt box 20, compared with the case where the shaft body is pre - welded to the bottom surface, it is possible to prevent the shaft body from interfering with the bolt during bolt - joining, and both smooth bolt - joining and closing of the bolt box 20 can be realized.

[0057] [Method for closing the bolt box of the segment according to the embodiment] Next, with reference to FIGS. 12A to 12I, an example of a method for closing the bolt box of the segment according to the embodiment will be described. Here, FIGS. 12A to 12I are process diagrams of an example of the closing method according to the embodiment in this order. Here, an example will be taken and described in which a bolt is inserted through the bolt hole 15a of the segment joint plate 15 using the bolt box 20 provided in the B - segment 10A and screwed into the insert nut 33 provided in the A - segment 10C.

[0058] As shown in FIG. 12A, the base nut 48 is welded to the bottom surface 12 of the bolt box 20 of the B - segment 10A. In attaching this base nut 48, as already described with reference to FIGS. 10 and 11, the positioning gauge J is used.

[0059] Next, as shown in FIG. 12B, the A - segment 10C is brought close to the B - segment 10A, the segment joint plates 15 of both are brought into contact, and after the corresponding bolt holes 15a are communicated, the bolt 30 is inserted through the bolt hole 15a using the bolt box 20 of the B - segment 10A, and the bolt 30 is screwed into the insert nut 33 provided inside the segment joint plate 15 of the A - segment 10C to bolt - join the B - segment 10A and the A - segment 10C (the above is step A).

[0060] Thereafter, the end of the all - thread bolt 41 is screwed into the base nut 48, and the all - thread bolt 41 is projected into the bolt box 20.

[0061] Thus, by protruding the fully threaded bolts 41 inside the bolt box 20 after bolt-joining the B segment 10A and the A segment 10C, it is possible to prevent the fully threaded bolts 41 from getting in the way during bolt-joining and achieve smooth bolt-joining (the above is Process B).

[0062] Next, as shown in Fig. 12C, while passing the fully threaded bolts 41 through the through holes 55 in the Y1 direction, the first-stage block body 50 is housed inside the bolt box 20, and the fixing nut 45 is tightened to fix the first-stage block body 50 to the fully threaded bolts 41.

[0063] At this time, since the counterbore grooves 56 are respectively provided around the through holes 55 on the two wide surfaces of the block body 50, one counterbore groove 56 can accommodate the base nut 48, and the other counterbore groove 56 can accommodate the fixing nut 45. This can prevent the base nut 48 and the fixing nut 45 from being fixed to each other in a state of protruding outside the block body 50.

[0064] Next, as shown in Fig. 12D, while passing the fully threaded bolts 41 through the through holes 55 in the Y2 direction, the second-stage block body 50 is housed inside the bolt box 20, and the fixing nut 45 is tightened to fix the second-stage block body 50 to the fully threaded bolts 41.

[0065] Next, as shown in Fig. 12E, while passing the fully threaded bolts 41 through the through holes 55 in the Y3 direction, the third-stage block body 50 is housed inside the bolt box 20, and the fixing nut 45 is tightened to fix the third-stage block body 50 to the fully threaded bolts 41. Thus, almost the entire area inside the bolt box 20 is blocked by the three block bodies 50 (the above is Process C).

[0066] Next, as shown in FIG. 12F, the straw S attached to the tip of the filling device M is inserted into the gap between the inner wall surface of the bolt box 20 and each block body 50, and the filler 60 is filled. Following the filling of the filler 60 into the gap between the inner wall surface of the bolt box 20 and each block body 50, as shown in FIG. 12G, the straw S is also inserted into the counterbore groove 56 of the block body 50 to be laminated, and the filler 60 is filled.

[0067] In this way, after installing the three block bodies 50 inside the bolt box 20, the filler 60 is filled into the slight gaps that have occurred to close the gaps, thereby forming the closing structure 100 of the bolt box (above is the D process).

[0068] Next, as shown in FIG. 12H, inside the bolt box 20, using a plasterer's trowel N, a secondary covering layer 70 made of, for example, resin mortar is plastered and finished, and as shown in FIG. 12I, it is smoothly finished so that its surface is flush with the surrounding secondary covering layer 18, thereby completing the construction (above is the E process).

[0069] According to the illustrated method for closing the bolt box, a shaft body 40 is protrudingly provided inside the bolt box 20, the shaft body 40 is passed through the through hole 55 of the block body 50, the block body 50 is accommodated in the bolt box 20 and fixed by the fixing member 45, and almost the entire inside of the bolt box 20 is closed by the block body 50. Therefore, there is no risk of the closing member for closing the bolt box 20 falling, it has high construction safety, and it is a closing method excellent in efficiency when closing the bolt box 20.

[0070] In addition, other embodiments in which other components are combined with the configurations and the like described in the above embodiments may be possible, and the present invention is not limited to the configurations shown here at all. In this regard, it can be changed without departing from the gist of the present invention, and can be appropriately determined according to the application form.

Explanation of Reference Numerals

[0071] 10: Segment 10A: Segment B (Segment) 10B: Segment K (Segment) 10C: Segment A (Segment) 11: Steel shell 12: Bottom surface 14: Main girder 15: Segment joint plate 15a: Bolt hole 16: Ring joint plate 18: Secondary lining (resin mortar) 20: Bolt box 30: Bolt 32: Head 33: Insert nut 40: Shaft body 41: Fully threaded bolt (bolt with thread, shaft body) 45: Fixing nut (fixing member) 48: Base nut 50: Block body 51: Main body 53: Recess 55: Through hole 56: Seat gouge groove 57A: Through hole for straw insertion 57B: Through hole for air venting 60: Filling material 70: Secondary lining (resin mortar) 100: Closing structure (closing structure of bolt box, closing structure of bolt box of segment) J: Positioning gauge J1: Position defining plate J1a: Position defining part J2: Standing piece J3: Cylindrical body M: Filling device S: Straw N: Metal trowel

Claims

1. A closing structure of a bolt box provided in a segment, in which bolts for bolt-joining adjacent segments are arranged, a shaft body that is directly or indirectly fixed to the bottom surface on the rock side of the bolt box and projects into the bolt box, and a block body having a through-hole through which the shaft body is inserted, and a fixing member that fixes the block body through which the shaft body passes through the through-hole to the shaft body, wherein the inside of the bolt box is closed by accommodating and fixing the block body inside the bolt box. A closing structure of a bolt box for a segment, characterized by this.

2. A plurality of the block bodies are stacked in a state where their respective through-holes are communicated and accommodated inside the bolt box, and the shaft body passes through the communicated through-holes of the plurality of block bodies, the shaft body is a threaded bolt, the fixing member is a fixing nut, and all the block bodies are fixed by tightening one of the fixing nuts with respect to the threaded bolt passing through the plurality of stacked block bodies. The closing structure of a bolt box for a segment according to Claim 1, characterized by this.

3. A plurality of the block bodies are stacked in a state where their respective through-holes are communicated and accommodated inside the bolt box, and the shaft body passes through the communicated through-holes of the plurality of block bodies, the shaft body is a threaded bolt, the fixing member is a fixing nut, a counterbore groove is provided around the through-hole in the block body, and for each of the block bodies, the threaded bolt passing through the through-hole is tightened with a unique fixing nut, and the fixing nut is accommodated in the counterbore groove, and each block body is fixed with the unique fixing nut. The closing structure of a bolt box for a segment according to Claim 1, characterized by this.

4. The threaded bolt is a full-thread bolt, a base nut is fixed to the steel bottom surface, and the shaft body formed by the full-thread bolt is screwed to the base nut. The closing structure of a bolt box for a segment according to Claim 2 or 3, characterized by this.

5. The plugging structure of the segment bolt box according to claim 2 or 3, characterized in that a filler is filled in the gap between the inside of the bolt box and the block body.

6. A method for plugging a segment bolt box, in which bolts for bolt-joining adjacent segments are arranged, comprising: Step A of bolt-joining adjacent segments with the bolts using both of the bolt boxes; Step B of directly or indirectly fixing a shaft body to the bottom surface on the rock side of the bolt box and projecting the shaft body into the bolt box; Step C of passing the shaft body through the through hole of a block body having a through hole, accommodating the block body in the bolt box, fixing the block body to the shaft body with a fixing member, and closing the inside of the bolt box with the block body. A method for plugging a segment bolt box, characterized by having the above steps.

7. The method for plugging a segment bolt box according to claim 6, further comprising step D of filling at least the gap between the inside of the bolt box and the block body with a filler.

8. On the tunnel inner space side of the region other than the bolt box in the segment, a secondary lining with a smooth surface is provided. The method for plugging a segment bolt box according to claim 6 or 7, further comprising step E of forming a secondary lining with a smooth surface on the tunnel inner space side of the bolt box.

9. Fix a base nut to the bottom surface of the bolt box using a positioning gauge. The positioning gauge has a position defining portion that defines the position where the base nut should be fixed when installed on the bottom surface of the bolt box. Position the base nut in the position defining portion and fix it to the bottom surface. In step B, the threaded bolt, which is the shaft body, is screwed and fixed to the base nut fixed to the bottom surface. The method for plugging a segment bolt box according to claim 8, characterized by the above steps.

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