JP6116347B2 - Joint material structure of tunnel centle - Google Patents

Description

  The present invention relates to a structure improvement of a joint material for forming joints of lining concrete.

  The tunnel lining concrete is formed by repeatedly moving the centle, injecting and curing the concrete between the excavated tunnel inner periphery and the centle outer periphery. At this time, joints are formed at the joints between the adjacent concretes to prevent corners from being lost. An example is shown in FIG.

  In FIG. 9, a centle mold 9 is positioned in the tunnel longitudinal direction (left-right direction in the figure). One end portion 91 located on the wellhead side of the mold 9 has entered the inner space of the lining concrete Cr1 after the curing and the mold 9 have moved, and has a trapezoidal cross section on the outer periphery of the one end 91. The joint material 10 which comprises is provided. The joint material 10 is made of, for example, synthetic rubber and has a through hole 101 formed therein, and a fixing wire 102 is inserted into the through hole 101. By fastening the wire 102, the joint material 10 is wound and fixed around the outer periphery of the one end 91 of the mold 9.

  The joint material 10 is positioned such that the upper surface (outer peripheral surface) 10a and one inclined side surface 10b are in contact with the inner peripheral surface of the notch Cc formed at the inner periphery of the end of the existing concrete Cr1, and the other inclined side surface 10c is the frame 9 And the concrete injection space Sc formed between the inner periphery of the tunnel (not shown). On the outer periphery of the other end portion 92 located on the face side of the mold 9, a steel plate joint material for forming a notch having the same shape as the notch Cc in the lining concrete poured into the concrete pouring space Sc. A piece 93 is provided. The concrete pouring space Sc is closed by a gable plate 95 disposed along the other end surface 94 of the mold 9. Such a joint material structure is shown in Patent Document 1. Patent Document 2 discloses an example of a telescopic type tunnel centle in which formwork is sequentially drawn out to the face side and lining concrete is placed.

JP2003-278396 JP2008-308855

  By the way, in the telescopic type tunnel centle, the formwork is divided into a plurality of parts in the longitudinal direction of the tunnel, and as soon as each divided formwork finishes the curing of the lining concrete, the formwork is drawn out to the face side, and a new one is drawn out. The lining concrete is poured into the outer periphery of the formwork. Therefore, the existing formwork for holding the lining concrete that is still cured is adjacent to the formwork that is newly fed out and poured with the lining concrete, as in the conventional case (see FIG. 9) The one end 91 of the mold 9 cannot be made to enter the inner space of the lining concrete Cr1, and it is therefore difficult to use the above conventional joint material structure for the telescopic tunnel centle. In particular, in the curved portion of the tunnel, a relatively large gap is generated between the new formwork that has been drawn out and the existing formwork, so that the joint material 10 cannot be fixed with the conventional joint material structure. was there.

  SUMMARY OF THE INVENTION The present invention solves such a problem, and an object of the present invention is to provide a joint material structure of a tunnel centre that can be used well even in a curved portion of a tunnel in a telescopic tunnel centre.

  In order to achieve the above object, in the first invention, the second formwork (2) is positioned in the tunnel longitudinal direction with respect to the first formwork (1) during curing of the lining concrete in the tunnel centle, and Protrusions that follow the cross-sectional shape of the joint of the lining concrete, abutted against the end (11) of the first mold (1) and the end (21) of the second mold (2) that face each other. The first joint material piece (7) and the second joint material piece (3) forming the portion (Pr) are provided, and the second joint material piece (3) is provided so as to be movable in the tunnel longitudinal direction. (1) and the second joint material piece (3) in the first joint material so that the gap (Gp) between the end portions (11, 21) of the second mold (2) is closed from the outside in the radial direction. It was made movable toward the piece (7) until it touched it.

  In the first aspect of the present invention, the second joint material piece provided on the second mold is moved toward the first joint material piece and brought into contact with the first joint material piece, thereby forming a projecting portion following the cross-sectional shape of the joint. Therefore, joints can be formed in the lining concrete without allowing one end of the formwork to enter the inner space of the lining concrete as in the prior art. Further, even if a relatively large gap is generated between the first mold frame and the second mold frame, the second joint material piece is moved in accordance with this and brought into contact with the first joint material piece in the same manner. A joint can be formed. Therefore, the joint material structure can be satisfactorily used even when the telescopic type tunnel centle is located at the curved portion of the tunnel.

  In the second invention, drive means (6, 8) for moving the second joint material piece (3) toward the first joint material piece (7) is provided.

  In the second invention, the second joint piece can be easily moved by the driving means.

  In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  As described above, according to the joint material structure of a tunnel centle of the present invention, it can be used in a telescopic type tunnel centle. In this case, the tunnel centle can be used well even if the tunnel centle is located in the curved portion of the tunnel. it can.

It is sectional drawing of the outer periphery part of a formwork which provided the joint material structure which shows 1st Embodiment of this invention. It is a fracture front view of a joint material piece. It is sectional drawing of the mold frame outer peripheral part which provided the joint material structure when a mold frame space | interval spreads. It is sectional drawing of the mold frame outer peripheral part which provided the joint material structure when a mold frame space | interval further spreads. It is sectional drawing of the mold frame outer peripheral part which provided the joint material structure which shows 2nd Embodiment of this invention. It is sectional drawing of the mold frame outer peripheral part which provided the joint material structure when a mold frame space | interval spreads. It is sectional drawing of the mold frame outer peripheral part which provided the joint material structure when a mold frame space | interval further spreads. It is sectional drawing of the mold outer periphery which provided the joint material structure which shows 3rd Embodiment of this invention. It is sectional drawing of the mold outer periphery part which provided the conventional joint material structure.

  The embodiment described below is merely an example, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included in the scope of the present invention.

(First embodiment)
FIG. 1 shows the outer periphery of the mold of a telescopic tunnel centle. In FIG. 1, the placed lining concrete Cr is being cured and is held between the outer peripheral wall of the existing formwork (first formwork) 1 and the inner periphery of the tunnel (not shown). A new formwork (second formwork) 2 fed out to the face side (right side in FIG. 1) through the formwork 1 with a known structure as described in the background art section is an end face 21 on the wellhead side. Is positioned to face the end face 11 of the mold 1.

  A joint material piece (second joint material piece) 3 is disposed between the opposite end faces 11 and 21 of both mold frames 1 and 2. The joint material piece 3 has a support plate portion 31 positioned along the end surface 11 of the mold 1, and the support plate portion 31 has a constant width along the outer peripheral edge of the mold frame end surface 11. As shown in FIG. 2, it extends in the circumferential direction (left-right direction in FIG. 2). The outer end of the support plate portion 31 extends outward beyond the outer periphery of the formwork end face 11, then bends at a right angle, and is further folded back inward, so that the leading edge 311 is the outer periphery of the formwork 2. It touches the surface.

  On the inner peripheral edge 312 of the support plate portion 31 of the joint piece 3, guide pins 4 are erected at a plurality of locations in the circumferential direction (in this embodiment, two locations), and the guide pins 4 serve as end surfaces 21 of the mold 2. Is slidably inserted into a bush 22 provided in the housing. Further, a closed container-like locking portion 5 is provided on the plate surface of the support plate portion 31 in the outer peripheral direction from each guide pin 4.

  And the front-end | tip part of the bolt member 6 as a drive means screwed in in the nut part 23 provided in the end surface 21 of the mold 2 penetrates the opening 51 provided in the top wall of the said latching | locking part 5. Yes. The bolt member 6 has a groove 61 that extends in the circumferential direction with a small diameter passing through the top wall of the locking part 5, and the top wall of the locking part 5 enters the groove 61 while forming a gap. doing. With such a structure, the bolt member 6 can be rotated forward and backward, and when the bolt member 6 moves back and forth in the axial direction, that is, when moved back and forth in the tunnel longitudinal direction, the support plate portion 31 is bolted via the locking portion 5. It is moved back and forth integrally with the member 6.

  A support plate 71 of a joint material piece (first joint material piece) 7 is joined to the face side end surface 11 of the mold 1, and the support plate 71 has a constant width along the outer peripheral edge of the mold end surface 11. And the outer end of the support plate portion 71 extends outward beyond the outer periphery of the mold end surface 11 and is then folded back inward so that the leading edge 711 of the mold frame 1 It is in contact with the outer peripheral surface. In the state where the joint material pieces 3 and 7 are in contact with each other (the state shown in FIG. 1), the gap Gp between the ends of the molds 1 and 2 is closed from the outside (upper side in FIG. 1), and both eyes A protruding portion Pr that protrudes outward from the molds 1 and 2 in a trapezoidal cross section is formed by the outer end portions of the base material pieces 3 and 7. A plurality of pairs of joint material pieces 3 and 7 are provided in a necessary angle range along the outer peripheries of the molds 1 and 2.

  When a new lining concrete is injected into the concrete injection space Sc formed on the outside of the mold 2, the joint of the trapezoidal cross section is formed by the projecting portion Pr at the joint between the curing concrete Cr and the newly injected concrete. It is formed.

  Here, in the curved portion of the tunnel, the facing distance between the molds 1 and 2 on the outer peripheral side of the curve is widened as shown in FIGS. 3 and 4, and the gap Gp formed therebetween is increased. Therefore, in this case, the bolt member 6 is rotated and appropriately advanced toward the end surface 11 of the mold 1, and along with this, the joint material piece 3 is straightened while preventing lateral blur by the guide pins 4 serving as guide means. Thus, the support plate portion 31 is brought into contact with the mold end surface 11 (more precisely, the support plate portion 71 of the joint material piece 7) (FIGS. 3 and 4).

  As a result, the gap Gp between the molds 1 and 2 is closed from the outside, and at the same time, a projecting portion Pr that protrudes outward from the molds 1 and 2 in a trapezoidal cross section is formed. Therefore, if a new lining concrete is injected into the concrete injection space Sc formed outside the mold 2, the above-mentioned protrusion is formed at the joint between the curing concrete Cr and the newly injected concrete. A joint with a trapezoidal cross section is formed by the portion Pr.

  When the gap between the molds 1 and 2 is narrowed and the gap Gp formed between them is reduced, the bolt member 6 is reversely rotated accordingly, and the joint piece 3 is moved in the direction of the mold end face 21. Move back to.

  As described above, the joint material structure of the present embodiment ensures that the joint is formed at the joint of the lining concrete even if the distance of the gap between the existing mold and the new mold is changed in the telescopic tunnel center. Can do.

(Second embodiment)
In this embodiment, instead of the bolt member 6 of the first embodiment, an air tube 8 as a driving means is provided on the end surface 21 of the frame 2. The air tube 8 is a tube body made of a flexible chamber wall having sufficient strength, such as urethane rubber, and is connected to a compressed air source (not shown). The air tube 8 is in contact with the plate surface of the support plate portion 31 of the joint material piece 3. Other structures are the same as those of the first embodiment, and the same parts are denoted by the same reference numerals.

  In such a joint material structure, as the facing distance between the molds 1 and 2 increases, compressed air is fed into the air tube 8 as shown in FIGS. 6 and 7 to expand it, The support plate portion 31 of the joint material piece 3 is pushed in the direction of the end surface 11 of the mold 1, and the support plate portion 31 is always brought into contact with the end surface 11 of the mold 1 (support plate portion 71 of the joint material piece 7). As a result, the gap Gp between the molds 1 and 2 is closed from the outside and protrudes outward from the molds 1 and 2 with a trapezoidal cross section to form a joint of the trapezoidal cross section at the joint of the concrete Part Pr is formed. In the present embodiment, unlike the first embodiment, the joint material piece 3 cannot be moved in the direction away from the end surface 11 of the mold 1, but a driving force for bringing the joint material pieces 3 and 7 into contact with each other can be obtained. Thus, there is no problem in practical use, and the effect similar to that of the first embodiment can be obtained by such an embodiment.

(Third embodiment)
FIG. 8 shows a third embodiment of the present invention. In this embodiment, an elastic plate 32 such as rubber is attached to the surface of the support plate portion 31 of the joint material piece 3 that faces the support plate portion 71 of the joint material piece 7. With such a structure, the elastic plate 32 is in close contact with the support plate 71 while being deformed even when both the molds 2 and 3 are not facing each other and are at a slight angle. Can be formed satisfactorily. The elastic plate 32 may be provided not on the support plate portion 31 but on the support plate portion 71. The elastic plate 32 does not need to be provided on the entire surface of the support plate portions 31 and 71, and may be provided only on necessary portions such as the outermost peripheral portion. In this embodiment, the example applied to the structure of the first embodiment is shown, but it is needless to say that the present invention can be applied to the structure of the second embodiment and other structures.

  In addition, without providing the driving means such as the bolt member 6 and the air tube 8 in each of the above-described embodiments, the operator may directly move the joint material piece 3 to contact the end surface 11 of the frame 1.

DESCRIPTION OF SYMBOLS 1 ... 1st formwork, 11 ... End surface (end part), 2 ... 2nd formwork, 21 ... End surface (end part), 3 ... 2nd joint material piece, 4 ... Guide pin (guide means), 6 ... Bolt Member (driving means), 7 ... first joint piece, 8 ... air tube (driving means), Gp ... gap, Pr ... projection.

Claims (2)

The second mold is positioned in the tunnel longitudinal direction with respect to the first mold during curing of the lining concrete in the tunnel centle, and the end of the first mold and the end of the second mold facing each other, A first joint material piece and a second joint material piece are formed which are brought into contact with each other to form a protruding portion following the concave cross-sectional shape of the joint concrete joint, and the second joint material piece can be moved in the tunnel longitudinal direction. It is possible to move the second joint material piece toward the first joint material piece so as to close the gap between the ends of the first mold frame and the second mold frame from the outside in the radial direction until it comes into contact with the first joint material piece. The joint material structure of the tunnel centle. The joint material structure of a tunnel centle according to claim 1, further comprising a driving unit that moves the second joint material piece toward the first joint material piece.

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