JP2016023488A - Joint material structure for mold for tunnel lining - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint material structure for a mold for tunnel lining that is especially effective when used with a telescopic-type mold for tunnel lining at a curved part of the tunnel.SOLUTION: A mold 1B is placed next to a mold 1A in a longitudinal direction of a tunnel, the mold 1A being used for curing tunnel lining concrete. A first joint material piece 3 is disposed along an outer periphery of an end plate 15 of the mold 1A facing an end plate 14 of the mold 1B. Also, a receiving member 2 is disposed on the end plate 14 of the mold 1B, the receiving member being made of a spring plate having a base end 21 fixed on the end plate 14 and a tip 2b extending obliquely toward the end plate 15 of the mold 1A. A joint material piece 4 is brought in contact with the joint material piece 3 while having an inner peripheral surface of the joint material piece 4 supported on an end surface 2a of an outer periphery of the receiving member 2, for forming a protrusion similar to a recessed cross-sectional shape of a joint of the lining concrete.SELECTED DRAWING: Figure 5

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. 11, 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 enters the inner space of the lining concrete C after the mold 9 has moved after curing, and the outer periphery of the one end 91 has a trapezoidal cross section. 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 on the inner periphery of the end of the existing concrete C, and the other inclined side surface 10c is the mold 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. 11) The one end portion 91 of the mold 9 cannot enter the inner space of the lining concrete C. Therefore, it is difficult to use the conventional joint material structure for the telescopic tunnel centre. 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.

  Therefore, the present invention is to solve such problems, and an object of the present invention is to provide a joint material structure for a tunnel centre that is particularly effective when used in a curved portion of a telescopic tunnel centre.

  In order to achieve the above object, according to the first aspect of the present invention, the second mold (1B) is positioned in the tunnel longitudinal direction with respect to the first mold (1A) during lining concrete curing in the tunnel centle, and the first A first joint material piece (3) is provided on the outer periphery of the end (15) of the first mold (1A) facing the end (14) of the second mold (1B), and the second mold ( The base end (21) is fixed to the end portion (14) side of the end portion (14) side of 1B), and the tip end (2b) extends toward the end portion (15) of the first formwork (1A). A receiving member (2) made of a plate material that can be bent and deformed at least partially is provided, and the inner peripheral surface of the second joint material piece (4) is supported on the outer peripheral end surface (2a) of the receiving member (2). With the second joint material piece (4) in contact with the first joint material piece (3), Forming a protruding portion that follows the concave cross-sectional shape.

  In the first aspect of the invention, since the inner peripheral surface of the second joint material piece rests on and is supported by the outer peripheral end surface of the receiving member, the second joint material piece has a gap between the first mold frame and the second mold frame. The second joint material piece is properly brought into contact with the first joint material piece without falling into the inside, so that a protruding portion that follows the concave cross-sectional shape of the joint material of the lining concrete is formed.

  When the gap between the first mold frame and the second mold frame decreases and the gap decreases, the tip of the receiving member comes into contact with the first mold frame, and at least part of the receiving member is bent according to the load at the time of contact. Deform. In this case, the height of the outer peripheral end surface of the receiving member does not change. Thereby, even if the opposing space | interval of a 1st mold frame and a 2nd mold frame changes, the internal peripheral surface of a 2nd joint material piece is reliably supported by the outer peripheral end surface of a receiving member, and a 2nd joint material piece is 1st. It can be brought into proper contact with the joint material piece.

  In the second invention, a spacer member (6) is projected from the end plate (14) which is an end of the second mold (1B) toward the first mold (1A), and the receiving member is provided at the tip thereof. The base end (21) of the member (2) is fixed.

  In the second invention, even if the gap between the first mold frame and the second mold frame is increased, the second joint material piece is reliably supported by the receiving member provided at the tip of the spacer member, It can be brought into proper contact with the joint material piece.

  The scope of application of the present invention is not limited to telescopic tunnel centles. Therefore, in the third invention, the end of the tunnel centle mold (1) is brought close to the end of the existing lining concrete (C), and the inner peripheral surface of the end of the lining concrete (C) and the mold The outer peripheral surface of the frame (1) is positioned substantially on the same plane, and the base end is fixed to the end side of the mold (1), and the distal end (2b) is the lining concrete (1). ) Is provided with a receiving member (2) made of a plate material that extends toward the inner position of the notch (Cc) formed at the inner periphery of the end portion and at least a part of which can be bent and deformed. With the outer peripheral end face (2a) supporting the inner peripheral surface (8d) of the joint material (8), a part of the joint material (8) is inserted into the notch (Cc) to joint the lining concrete. A protrusion (P) is formed following the concave cross-sectional shape.

  In the first aspect of the invention, the formwork is placed at a position where it does not interfere with the existing lining concrete in the longitudinal direction, and only the receiving member faces the notch space of the lining concrete. Thereby, it is avoided that a formwork and a receiving member interfere with lining concrete when a formwork is expanded in diameter. Therefore, it is prevented that the inner peripheral surface of the existing lining concrete is pushed up excessively to cause cracks in the concrete. The joint material pushed into the notch along the outer periphery of the frame body is favorably supported by the receiving member, and a protruding portion that follows the concave cross-sectional shape of the joint is formed. Even if the receiving member comes into contact with the notch surface in the tunnel longitudinal direction, at least a part of the receiving member is bent and deformed according to the load at the time of contact, so that the notch surface is not damaged.

  The reference numerals in the parentheses indicate the correspondence with specific means described in the embodiments described later.

  As described above, according to the joint material structure of a tunnel centle of the present invention, the telescopic tunnel centle can be used well even in a curved portion of a tunnel.

It is a half part front view of the formwork edge part of the telescopic type tunnel centile in 1st Embodiment of this invention. It is a front view of a receiving member. It is a side view of a receiving member. It is sectional drawing of the well end side end plate of the formwork which provided the receiving member. It is sectional drawing of the mold outer periphery part which provided the joint material structure. It is sectional drawing of the mold frame outer peripheral part which provided the joint material structure when the clearance gap between mold forms became small. It is sectional drawing of the mold frame outer peripheral part which provided the other joint material structure when the clearance gap between mold forms is large. It is sectional drawing of the mold outer periphery part which provided the joint material structure in 2nd Embodiment of this invention. It is sectional drawing of the well end side end plate of the formwork which provided the receiving member in another example. It is sectional drawing of the well end side end plate of the formwork which provided the receiving member in other examples. 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 a half front view of an end portion of a mold 1 of a telescopic tunnel centle. The mold 1 is supported by a portal gantry (not shown) and can move in the tunnel longitudinal direction (perpendicular to the paper surface). The formwork 1 actually has a tunnel shape that is symmetrical with respect to the center line. The top form 11 located at the top and the side form 12 that is rotatably connected to the end of the top form 11. And a lower end foam 13 rotatably connected to the lower end of the side foam 12.

  In the telescopic type tunnel centle, as described above, the formwork 1 is divided into a plurality in the tunnel longitudinal direction, and each divided formwork 1 is fed to the face side as soon as the lining concrete is cured. The lining concrete is poured into the outer periphery of the new formwork that has been fed out. Therefore, the existing formwork (first formwork) for holding the lining concrete that is still cured is adjacent to the formwork (second formwork) that is newly drawn out and into which the lining concrete is poured. Will do.

  In the present embodiment, the receiving members 2 are provided at a plurality of locations on the peripheral surface of the top end form 11, the side form 12, and the lower end form 13 constituting one end face (wellhead side end face) of each divided formwork 1. It has been. Details of the receiving member 2 will be described below. In this embodiment, the receiving member 2 is constituted by a spring plate, and a front view thereof is shown in FIG. 2 and a side view thereof is shown in FIG. As is apparent from FIGS. 2 and 3, the receiving member 2 is obtained by appropriately chamfering the four corners of a substantially rectangular spring plate, and a straight line 1 that crosses the plate surface leaving one end portion 21 as a base end with a predetermined width D. Is bent and inclined at a constant angle θ. In this case, the length L and the bending angle θ of the inclined portion 22 of the receiving member 2 are appropriately determined in consideration of the size of the gap formed between the opposite end faces of the molds, as will be described later. Is done. A mounting hole 23 is provided in the center of the one end 21. The spring plate is preferable in that it has an original restoring force after being deformed, but the receiving member 2 is not necessarily formed of a spring plate, and may be a normal metal plate or a resin plate.

  FIG. 4 is an enlarged cross-sectional view of the well end side end plate 14 of the telescopic tunnel centle mold 1B (second mold) provided with the receiving member 2. The end (face side end) 15 of the existing formwork 1A (first formwork) is opposed to the well end side end plate 14, and between the well end side end plate 14 and the face side end 15 is provided. The receiving member 2 extending from the well end side end plate 14 is located in the gap G. FIG. 5 shows a detailed cross section of a portion where the receiving member 2 is installed.

  In FIG. 5, lining concrete C under curing is held between the outer periphery of the existing formwork 1A and the inner periphery of the tunnel (not shown). The new formwork 1B fed out to the face side (right side in FIG. 1) through the formwork 1A in a known structure has its well end side end plate 14 on the end plate 15 which is the face side end of the formwork 1A. It is located opposite.

  A support plate 31 constituting a joint material piece (first joint material piece) 3 is coupled to the end plate 15 of the mold 1 </ b> A by bolts 311, and the support plate 31 is constant along the outer peripheral edge of the end plate 15. While extending in the circumferential direction by the width, the outer end of the support plate 31 extends outward beyond the outer periphery of the end plate 15. The upper end of the inclined plate 32 whose lower edge is in contact with the outer peripheral surface of the mold 1A is held in an inclined posture in contact with the upper end of the support plate 31, and the support plate 31, the inclined plate 32, Thus, a triangular cross-sectional space of the joint material piece 3 is formed.

  The receiving member 2 is coupled and fixed to the well end side end plate 14 of the mold 1B by inserting a bolt 24 into the mounting hole 23 (FIG. 2). The outer peripheral end surface 2a of the receiving member 2 is substantially the same height as the outer peripheral surface of the mold 1B. In this state, the receiving member 2 extends toward the end plate 15 of the mold 1A, and the tip 2b approaches the end plate 15. Yes. Joint material pieces (second joint material pieces) 4 are disposed on the outer periphery of the mold 1B. The joint material piece 4 is made of rubber in this embodiment, and the front surface 4a facing the joint material piece 3 is a vertical surface, has a parallel upper surface and lower surface, and has a trapezoidal cross section whose rear surface is inclined toward the outer peripheral surface of the formwork. ing. A through hole 41 through which a tightening wire is passed is formed in the center of the trapezoidal cross section.

  In such a joint material structure, when the joint material piece 4 is disposed on the outer periphery of the mold 1B and the joint material piece 4 is pushed in the direction of the frame body 1A along the outer periphery of the frame body 1B, the joint material piece 4 The inner peripheral surface (the lower surface in FIG. 5) is placed on and supported by the outer peripheral end surface 2 a of the receiving member 2. Therefore, the joint material piece 4 does not fall into the gap G between the end plate 14 and the end plate 15, and the front surface 4 a of the joint material piece 4 is properly brought into contact with the front surface of the support plate 31 of the joint material piece 3. (FIG. 5). In this state, the wire is tightened by passing the wire into the through hole 41 of the joint material piece 4, thereby positioning the joint material piece 4 in pressure contact with the outer periphery of the mold 1 </ b> B and the outer peripheral end surface 2 a of the receiving member 2.

  And the joint material piece 3 and 4 contact | abutted mutually forms the protrusion part of the trapezoidal cross section which the both sides | surfaces opened in the inner peripheral direction which followed the concave cross-sectional shape of the joint of the lining concrete. Then, when new lining concrete is injected into the concrete injection space Sc formed on the outside of the mold 1B, the joint of the trapezoidal cross section is formed by the projecting portion at the joint between the curing concrete C and the newly injected concrete. Is formed.

  When the gap between the molds 1A and 1B decreases and the gap G formed between them becomes smaller, the tip 2b of the receiving member 2 comes into contact with the end plate 15 of the mold 1A as shown in FIG. Since the receiving member 2 is composed of a spring plate, the receiving member 2 is elastically deformed so as to increase the bending angle θ according to the load received at the time of contact (chain line in FIG. 4). Also at this time, the outer peripheral end surface 2a of the receiving member 2 maintains substantially the same height as the outer peripheral surface of the mold 1B. Thus, even if the facing distance between the molds 1A and 1B changes, the inner peripheral surface of the joint material piece 4 is reliably supported by the outer peripheral end surface 2a of the receiving member 2, so that the joint material piece 4 is in the gap G. The joint material pieces 3 and 4 are properly brought into contact with each other without being depressed.

  In the telescopic tunnel centle, the gap G between the molds 1A and 1B may be considerably large outside the curved portion of the tunnel. In this case, for example, a structure as shown in FIG. That is, in FIG. 7, the stay 5 having an L-shaped cross section is bolted to the end plate 14 of the mold 1B, and the outer peripheral surface of one side 51 extending in the direction of the mold 1A is made to coincide with the outer peripheral surface of the mold 1B. Further, a cylindrical spacer 6 having a predetermined length is erected on the end plate 14 of the mold 1B so as to face the mold 1A, and the receiving member 2 is fixed to the front end thereof with a bolt 24. Then, the outer peripheral end surface 2 a of the receiving member 2 is made substantially flush with the outer peripheral surface of one side 51 of the stay 5. With such a structure, even when the gap G between the molds 1A and 1B is large, the joint material piece 4 is reliably supported by the stay 5 and the receiving member 2 and properly brought into contact with the joint material piece 3. be able to. The stay 5 is not necessarily provided. Further, the spacer member does not necessarily have a cylindrical shape, and may be any member that protrudes by a certain amount in the direction of the mold 1A and can fix and support the receiving member 2 at the tip thereof.

(Second Embodiment)
In FIG. 8, the formwork 1 that has been reduced in diameter by a known structure and separated from the inner peripheral surface of the existing concrete C with respect to the existing lining concrete C that has been cured is It is moved to the front side (right side of FIG. 8) of the face side from C, and the end portion on the wellhead side of the mold 1 approaches the face side end portion of the existing concrete C. Here, the notch Cc which inclines in the tunnel axial direction (left-right direction of FIG. 1) is formed in the inner periphery of the edge part of the existing concrete C. As shown in FIG. This notch Cc is formed at the time of placing the existing concrete C by a joint material piece provided on the outer periphery of the face side end portion (not shown) of the mold 1.

  The end portion of the mold 1 is provided with the receiving member 2 having the same structure as that described in the first embodiment on the well end plate 14. That is, the receiving member 2 is coupled and fixed to the well end side end plate 14 of the mold 1 by the bolts 24, and the outer peripheral end surface 2 a of the receiving member 2 is substantially the same height as the outer peripheral surface of the mold 1. And in this state, the front-end | tip of the receiving member 2 is extended to the inner side position of the notch of covering concrete.

  The mold 1 once reduced in diameter to be detached from the inner peripheral surface of the existing concrete C is expanded again after moving from the existing concrete C to the front side of the face, so that the outer peripheral surface of the mold 1 becomes the existing concrete C. It is made to be substantially the same as the inner peripheral surface of the. Here, in this embodiment, the formwork 1 is not in a position where it interferes with the existing concrete C in the longitudinal direction, and the receiving member 2 faces the notch Cc of the existing concrete C. Therefore, when the diameter of the mold 1 is expanded, even if the mold 1 and the receiving member 2 move outward (upward in FIG. 8) to some extent, they do not interfere with the existing concrete C. Thereby, the problem that the internal peripheral surface of the existing concrete C is pushed up excessively and a crack arises in the said concrete C is avoided. Even if the barb receiving member 2 comes into contact with the inner peripheral surface of the notch Cc in the tunnel longitudinal direction, the receiving member 2 is deformed so that the bending angle becomes larger according to the load at the time of contact, so the notch Cc. Will not be damaged.

  In this state, the joint material 8 is disposed on the outer periphery of the mold 1. The joint material 8 is entirely made of rubber and has parallel upper surface (outer peripheral surface) 8a and lower surface 8d (inner peripheral surface), and the front surface 8b and the rear surface 8c facing the notch Cc of the existing concrete C are respectively directed to the inner peripheral side. It has a trapezoidal section that is inclined to open. A through hole 81 through which the tightening wire 82 passes is formed at the center of the trapezoidal cross section. The cross-sectional shape of the joint material 8 is not limited to a trapezoid, and may be a triangular cross section, for example.

  When such joint material 8 is pushed into the notch Cc along the outer periphery of the frame body 1, the inner peripheral surface 8 d of the joint material 8 is placed on and supported by the outer peripheral end surface 2 a of the receiving member 1. In this state, the wire 82 is tightened through the wire 82 in the through hole 81 of the joint material 8, whereby the joint material 8 is positioned in pressure contact with the outer periphery of the mold 1 and the outer peripheral end surface 2 a of the receiving member 2. Then, the joint material 8 forms a trapezoidal cross-sectional protrusion P whose both side surfaces are open in the inner circumferential direction, following the concave cross-sectional shape of the joint of the lining concrete, in which the notch Cc constitutes a part thereof. .

  In each of the above embodiments, the receiving member 2 is bent and inclined at a certain angle from the base end, and the receiving member 2 is deformed so that the bending angle increases according to the load received at the time of contact. Not limited to anything. For example, as shown in FIG. 9, when the receiving member 2 'is formed into a bellows fold shape and the gap G between the molds 1A and 1B becomes small (dashed line in FIG. 9), It is good also as what deform | transforms so that the bending degree may become large according to the increase in the load to receive. In addition, it is not necessary to make the whole into a bellows fold shape, and only a part can be a bellows fold shape. Alternatively, as shown in FIG. 10, when the entire receiving member 2 ″ is curved in an arc shape and the gap G between the molds 1A and 1B is reduced (chain line in FIG. 10), It is good also as what deform | transforms so that the curvature may become large according to the increase in the load to receive.

DESCRIPTION OF SYMBOLS 1A ... 1st formwork, 1B ... 2nd formwork, 14 ... End plate (end part), 15 ... End plate (end part), 2 ... Receiving member, 2a ... Outer peripheral end surface, 2b ... End, 21 ... One end part (Base end), 2 '... receiving member, 2 "... receiving member, 3 ... first joint material piece, 4 ... second joint material piece, 6 ... cylindrical spacer (spacer member), 8 ... joint material, C ... lining concrete, Cc ... notch.

Claims (3)

Position the second mold in the tunnel longitudinal direction with respect to the first mold during curing of the lining concrete in the tunnel centle, and on the outer periphery of the end of the first mold facing the end of the second mold While providing the 1st joint material piece, the base end is fixed to the end part side on the end part side of the second formwork, and the tip extends toward the end part of the first formwork, and at least a part thereof is A receiving member made of a plate material that can be bent and deformed is provided, and the second joint material piece is used as the first joint material piece in a state where the outer peripheral end surface of the receiving member supports the inner peripheral surface of the second joint material piece. A joint material structure for a tunnel centle, characterized in that a projecting portion following the concave cross-sectional shape of the joint concrete joint is formed by abutting. The tunnel centle according to claim 1, wherein a spacer member is projected from an end plate constituting an end portion of the second mold frame toward the first mold frame, and a base end of the receiving member is fixed to a distal end thereof. Joint material structure. The end of the tunnel centre mold is brought close to the end of the existing lining concrete, and the inner peripheral surface of the end of the lining concrete and the outer peripheral surface of the mold are positioned on substantially the same plane. A plate member whose base end is fixed to the end portion side, the tip end extends toward an inner position of a notch formed in the inner periphery of the end portion of the lining concrete, and at least a part of which is bent and deformable A concave section of the joint of the lining concrete by inserting a part of the joint material into the notch in a state where the outer peripheral end surface of the support member is supported on the inner peripheral surface of the joint member. A joint material structure for tunnel centles, characterized by the formation of protrusions following the shape.

Images