JP5700401B2 - Rail system for inner formwork - Google Patents

Description

  The present invention relates to a rail of an inner mold that forms a travel path of the carriage when the carriage is moved along the central axis of the cylinder of the inner mold, and means for making the rail detachable from the inner mold The present invention relates to a rail device of an inner formwork provided with

Conventionally, excavated by excavating natural ground with a shield excavator, along the inner peripheral surface of the tunnel cavity portion and the inner peripheral surface of the tunnel cavity portion formed by the excavation hole in the rear portion (wellhead side) of the shield excavator Cast-in-place lining method (hereinafter referred to as ECL method) in which unconsolidated (fluid) concrete (hereinafter referred to as ready-mixed concrete) is poured into the installed inner form to construct lining concrete as the lining portion. (Refer to Patent Document 1, for example).
In the ECL method, a plurality of arc-shaped formwork pieces are installed so as to make one round of the inner peripheral surface along the inner peripheral surface of the tunnel cavity, thereby forming a circular ring-shaped inner mold frame. A cylindrical inner mold is formed by sequentially joining the inner molds in the direction of excavation and extending in the direction of excavation.

The inner mold is formed by a plurality of mold pieces. As shown in FIGS. 23; 24; 25, a plurality of individual mold pieces 40 forming a circular ring-shaped inner mold 30 are formed in the tunnel cavity 21 formed by the excavation holes excavating the natural ground 20. The arcuate formwork surface 34 installed so as to face the inner peripheral surface 33 with a space along the peripheral surface 33 and the inner peripheral surface 33 of the tunnel cavity 21 are adjacent to each other in the circumferential direction. The pair of piece joint plates 45; 45 formed with piece joint surfaces 47a for connecting the mold pieces 40; 40 to each other, and the inner peripheral surface 33 of the tunnel cavity 21 are adjacent to each other in the excavation progress direction A. A pair of ring joint plates 46; 46 formed with a ring joint surface 47b for connecting the two pieces 40; and a pair of piece joint plates 45; a plurality of first connection reinforcing plates for connecting the 45 pieces together. 45a; 45a ( Comprising 46a (hereinafter, the inside of the sub-digit), a; lower, Chunushi called digits), a pair of ring joint plate 46; a plurality of second connection reinforcing plate 46a for coupling to each other 46. The plurality of middle main girders 45a; 45a and the plurality of middle sub-girder 46a; A lattice-shaped piece inner surface connected by the tip end surfaces of the piece joint plate 45, the middle main girder 45a, the ring joint plate 46, and the middle sub-girder 46a extending from the mold surface 34 toward the center of the arc of the mold surface 34. Is formed in an arcuate surface parallel to the formwork surface 34.
The piece joint plate 45 is connected to the piece joint plate 45 so that the piece joint surfaces 47a adjacent to each other in the circumferential direction of the inner peripheral surface 33 of the tunnel cavity 21 are closely coupled by fastening with bolts and nuts not shown. Bolt through holes 43a for passing the bolts through 45 are formed. Similarly, the ring joint plate 46 is connected so that the ring joint surfaces 47b adjacent to each other in the excavation progress direction A of the inner peripheral surface 33 of the tunnel cavity 21 are tightly coupled by fastening with bolts and nuts. Bolt through holes 43b are formed through the plate 46 for passing the bolts.
Accordingly, a bolt (not shown) is inserted into the bolt through hole 43a in a state where the piece joint surfaces 47a of the mold pieces 40 installed adjacent to each other in the circumferential direction of the inner peripheral surface 33 of the tunnel cavity 21 are in contact with each other. By tightening the nut from the tip of the bolt, the piece joint surfaces 47a are coupled in a close state. Further, a bolt (not shown) is inserted into the bolt through hole 43b in a state where the ring joint surfaces 47b of the formwork pieces 40 installed adjacent to each other in the tunnel excavation traveling direction of the inner peripheral surface 33 of the tunnel cavity portion 21 are in contact with each other. By inserting and fastening the nut from the tip of the bolt, the ring joint surfaces 47b are coupled in close contact with each other.

  As shown in FIGS. 24 and 25, a circular ring-shaped inner mold 30 formed by installing a plurality of mold pieces 40 so as to make one round along the inner peripheral surface 33 of the tunnel cavity 21 is shown in FIG. Called a ring. That is, in order to form one ring, the plurality of mold pieces 40 are separated from the inner peripheral surface 33 of the tunnel cavity portion 21 by an interval d corresponding to the thickness of the lining portion. The inner circumferential surface 33 is installed so as to make one round along the inner circumferential surface 33. In this case, the inner mold 30 for one ring is assembled by an inner mold assembling apparatus called an erector (not shown) so that the piece joint surfaces 47a are closely coupled. After the excavation progresses, the inner mold 30 for one ring is further assembled in the excavation progress direction A. In this case, the mold piece 40 is excavated so that the piece joint surfaces 47a are in close contact with each other in the circumferential direction of the inner peripheral surface 33 of the tunnel cavity 21 and the inner peripheral surface 33 of the tunnel cavity 21 is excavated. By the inner mold assembly apparatus, the ring joint surface 47b of the first ring assembled in the advancing direction A and the ring joint surface 47b of the mold piece 40 forming the one ring assembled this time are closely coupled to each other. The inner mold 30 for one ring is assembled.

  As shown in FIG. 25, the shield excavator 22 has a rotary cutting portion 23 at the front end, and a cylindrical tail plate 24 that extends rearward at the rear portion of the rotary cutting portion 23. Inside the tail plate 24, a plurality of propulsion jacks 25, a press jack 26, and a wife form frame 27 are provided. The end frame 27 is a press frame that is attached to the rear end of the press jack 26 and is formed in a circular ring shape so as to be movable back and forth along the inner peripheral surface of the tail plate 24. That is, the end frame 27 is a circular ring-shaped mold that can move back and forth by the expansion and contraction of the press jack 26 in a state where the space between the inner peripheral surface 24a of the tail plate 24 and the mold surface 34 of the inner mold 30 is closed. A non-illustrated placement hole for placing ready-mixed concrete in a filling space provided between the outer peripheral surface of the inner mold, the inner peripheral surface of the tunnel cavity, and the front end surface of the lining concrete 28. And pressurizing the ready-mixed concrete 29 placed in the filling space.

  At the start of excavation, the shield excavator 22 is propelled using a reaction force receiver (not shown) provided on the wellhead side, and the inner excavator 30 is composed of, for example, a plurality of rings behind the shield excavator 22. After assembling the circular cylindrical inner mold 31, the gap between the front end surface of the inner mold 31 and the inner peripheral surface of the tunnel cavity 21 is closed with a wife mold 27, and the rear end surface of the inner mold 31 After the space between the inner peripheral surface of the tunnel cavity portion 21 is closed with a non-illustrated sealing plate, the outer peripheral surface of the inner mold frame 31 and the inner peripheral surface of the tunnel cavity portion 21 are inserted through the casting holes of the end mold frame 27. In order to form the lining concrete 28 by pouring the ready-mixed concrete between them, the reaction force of the shield excavator 22 can be obtained by the adhesive force (frictional force) between the inner mold 31 and the lining concrete 28. Like that. Thereafter, as shown in FIG. 25, after the inner mold 30 for one ring is constructed on the front end face of the circular cylindrical inner mold 31, the inner mold for this one ring is inserted through the casting hole of the wife mold 27. By repeating the operation of continuously pouring the ready-mixed concrete 29 into the filling space between the outer peripheral surface of the frame 30, the inner peripheral surface of the tunnel cavity 21 and the front end surface of the lining concrete 28 to form the lining concrete 28. Go.

The mold piece 40 is used in a number that can form an inner mold frame for a predetermined number of rings (that is, a cylindrical inner mold frame extending in the excavation traveling direction A), and a circular cylinder shape for a predetermined number of rings. After the inner mold 31 is installed, the mold piece 40 for one ring located at the rear portion in the excavation traveling direction on the wellhead side of the inner mold 31 is disassembled and removed by the inner mold removing device. Then, the shield excavator 22 is advanced, and the removed mold piece 40 for one ring is used after being replaced with the leading position of the inner mold 31 in the excavation direction.
In other words, after installing a predetermined number of inner molds for the ring, each time excavation progresses, the mold piece 40 is rearranged from the rear side (wellhead side) to the front side (face side) and repeatedly used. One ring is assembled at the head position of the frame 31 in the direction of excavation.
That is, every time excavation progresses, the mold piece 40 constituting the rear one ring is removed by the inner mold removal device, the rear one ring is disassembled, and the removed mold piece 40 is called a hoist. It is moved forward by a simple piece conveying means 41 (see FIG. 25; FIG. 26). Then, the inner mold assembly apparatus assembles a new ring on the front end surface of the inner mold 31. By repeating such operations, the cylindrical inner mold 31 extending in the excavation traveling direction A is moved in the traveling direction by one ring as the shield excavator 22 proceeds.

  As shown in FIG. 24, at least one mold piece among a plurality of mold pieces 40 forming the inner mold 30 for one ring is formed on a mold piece 39 for demolding. A demolding mold piece 39 called a K mold piece is positioned nearer to the inner peripheral surface 33 of the tunnel cavity 21 and forms a mold surface 34 on the side of the tunnel cavity 21 on the mold surface 34 side. The width dimension b in the circumferential direction is smaller than the width dimension a in the circumferential direction of the tunnel cavity portion 21 on the surface 39b on the opposite side of the mold surface 34 (the surface located closer to the center 2C of the tunnel cavity portion 21). In addition, a dedicated formwork piece 38 is also used as the formwork piece installed on both sides in the circumferential direction of the formwork piece 39 for demolding. A form piece 40 called an A form piece excluding a form piece 39 for demolding and a form piece 38 for exclusive use among the form pieces forming the inner form 30 for one ring is formed in the tunnel cavity 21. The width dimension b in the circumferential direction of the tunnel cavity portion 21 on the mold surface 34 side that is located closer to the inner peripheral surface 33 of the mold frame surface 34 is the tunnel of the surface 39 b on the opposite side of the mold surface 34. It is larger than the width dimension a in the circumferential direction of the cavity 21. And when assembling one ring, the mold piece 39 for mold removal is attached lastly, and when disassembling one ring, it removes from the mold piece 39 for mold removal. That is, even if one ring is assembled using only the formwork piece 40 called A formwork piece, the last formwork piece 40 is moved from the center 2C side of the tunnel cavity 21 to the inner peripheral surface 33 of the tunnel cavity 21. Since it is impossible to assemble it toward the direction (that is, toward the radial direction of the cross-sectional circle of the tunnel cavity 21), the mold piece that is assembled last and removed first is called a K-shaped frame piece. The formwork piece 39 is used.

24; FIG. 25; As shown in FIG. 26, on the inner surface of the inner mold 31, there is a traveling path of a carriage 44 on which a concrete placing device, an inner mold removing device, a mold piece conveying means 41 and the like are mounted. The rail 42 is fixed (see, for example, Patent Document 2). That is, of the plurality of mold pieces 40 that form the cylindrical inner mold 31 constructed so as to extend in the excavation traveling direction A in the tunnel cavity 21, the cylindrical cross section of the cylindrical inner mold 31 ( The left rail 42L is fixed to the inner wall portion 40u of the mold piece 40 disposed between the lowermost point 31u and the leftmost point 31L of the inner wall peripheral surface 31a, which is a cross section orthogonal to the central axis of the cylinder) A right rail 42R is fixed to the inner wall portion 40u of the mold piece 40 arranged between the lowermost point 31u and the rightmost point 31R of the inner wall peripheral surface 31a of the cylindrical inner mold 31.
The pair of left and right rails 42L and 42R are respectively installed at positions separated from the lowest point 31u of the cylindrical inner mold 31 by the same distance on the left and right in the circumferential direction. The distance between the left and right rails 42L and 42R is determined according to the distance between the left and right wheels 44a and 44b of the carriage 44.

JP 2005-188099 A JP-A-1-187300

Conventionally, as described above, every time excavation progresses, the mold piece 40 constituting the rear one ring is removed by the inner mold removal apparatus, the rear one ring is disassembled, and the mold piece 40 is removed from the mold. Is moved forward by the mold piece conveying means 41 and stacked on the inner bottom surface of the cylindrical inner mold 31. As shown in FIGS. 23 and 24, the rail 42 is fixed to the inner surface. When the formwork pieces 40 are stacked, the stacking height of the portion where the rails 42 are located increases. That is, the stacking height of the mold piece 40 from the inner bottom surface of the inner mold 31 becomes uneven. In this case, if the mold piece 40 is to be conveyed from the rear to the front by the mold piece conveying means 41, the portion having a higher stacking height due to the rail 42 and the mold piece 40 to be conveyed collide with each other. The frame piece 40 may not be transported forward (see FIG. 25; FIG. 26). In this case, it becomes necessary to eliminate the stacking of the formwork pieces 40 with the rails 42 fixed to the inner surface, thereby deteriorating the workability.
The present invention eliminates the above-mentioned problems by allowing the formwork pieces without rails to be stacked on the inner bottom surface of the inner formwork so that the stacking height of the formwork pieces can be made uniform. For the purpose.

The rail device for the inner formwork according to the present invention is installed along the inner peripheral surface of the tunnel cavity formed by the excavation hole excavated from the natural ground, and the lining portion between the inner peripheral surface of the tunnel cavity The carriage travels when the carriage is attached to the inside of the cylindrical inner mold for forming the frame and extends along the central axis of the cylinder of the inner mold and moves along the central axis of the cylinder of the inner mold A rail for an inner mold forming a path; an attachment provided on an inner wall surface of the inner mold; and an attachment means for detachably attaching the rail to the attachment. The mounting plate is provided on the inner wall surface and the mounting hole formed in the mounting plate. The mounting means has an engaging portion inserted into the mounting hole and an engaging portion inserted into the mounting hole. since a locking means for locking not to come off from the hole, the inner bottom surface of the inner mold, Masonry mold pieces without rails Since the stacking height of the formwork pieces can be made uniform, the part where the stacking height is increased by the rail and the formwork piece to be transported collide with the mold as before. A situation in which the frame piece cannot be conveyed forward can be prevented , the rail is configured to be detachable from the mounting portion, and the rail can be securely fixed to the mounting portion.
Another internal formwork rail device according to the present invention is installed along the inner peripheral surface of the tunnel cavity formed by the excavation hole excavated from the natural ground and covers between the inner peripheral surface of the tunnel cavity. A carriage attached to the inside of a cylindrical inner mold for forming a work part, extending along the central axis of the cylinder of the inner mold and moving the carriage along the central axis of the cylinder of the inner mold A rail of the inner mold forming the traveling path of the inner mold, a mounting portion provided on the inner wall surface of the inner mold, and a mounting means for detachably mounting the rail to the mounting portion. It is composed of a mounting plate provided on the inner wall surface of the mold and a mounting hole formed in the mounting plate, the mounting means includes a jack, and the jack has one end side engaging portion provided on one end side of the piston cylinder. And the other end side engagement provided on the tip end side of the piston protruding from the other end of the piston cylinder. The one end side engaging portion is formed with a diameter larger than the diameter of one of the pair of mounting holes formed in the pair of mounting plates facing each other, and the shaft end surface of the mounting plate One end side large diameter shaft portion that contacts the plate surface, and one end side small diameter shaft portion that protrudes from the shaft end surface of the one end side large diameter shaft portion and is inserted into one mounting hole, the other end side engagement portion is, The other end side large-diameter shaft portion that is formed to have a diameter larger than the diameter of the other mounting hole of the pair of mounting holes and the shaft end surface contacts the plate surface of the mounting plate, and the shaft of the other end-side large diameter shaft portion Since the other end side small diameter shaft portion that protrudes from the end face and is inserted into the other mounting hole is provided, it becomes possible to stack the formwork pieces without rails on the inner bottom surface of the inner formwork. The stacking height can be made uniform so that it can be transported to the part where the stacking height is increased by the rail as before. The mold piece and collide mold pieces can be prevented a situation that can not be transported forward that the rail is configured to be detachable with respect to the mounting portion, and strong and stable attachment of the mounting portion rails In addition, since it is possible to eliminate the need for fastening the set screw, the work can be facilitated.
Still another inner form rail device according to the present invention is installed along an inner peripheral surface of a tunnel cavity formed by an excavation hole excavated from a natural ground, and between the inner peripheral surface of the tunnel cavity. It is attached to the inside of the cylindrical inner mold for forming the lining part, and extends along the central axis of the cylinder of the inner mold, and moves the carriage along the central axis of the cylinder of the inner mold. The rail of the inner mold forming the traveling path of the carriage, the mounting portion provided on the inner wall surface of the inner mold, and the mounting means for detachably mounting the rail to the mounting portion , the mounting portion, One of a pair of mounting holes formed by a mounting plate provided on the inner wall surface of the inner mold and a mounting hole formed in the mounting plate, and the mounting means is formed in each of the pair of mounting plates facing each other The engaging portion inserted through the mounting hole and the other mounting hole of the pair of mounting holes. And a jack having a piston which can be advanced and retracted so as to engage with the other mounting hole, and a locking means for locking the engaging portion inserted through the one mounting hole so as not to be disengaged from the one mounting hole. Therefore, it becomes possible to stack the formwork pieces without rails on the inner bottom surface of the inner formwork, and the stacking height of the formwork pieces can be made uniform. It is possible to prevent a situation in which the formed part and the formwork piece to be conveyed collide and the formwork piece cannot be conveyed forward , and the rail is configured to be detachable from the attachment part, and the rail is attached to the attachment part. It becomes possible to attach to a strong and stable.
The cylindrical inner mold forms a ring-shaped inner mold by arranging a plurality of arc-shaped mold pieces so as to make one round of the inner peripheral surface along the inner peripheral surface of the tunnel cavity. The inner mold is sequentially assembled in the direction of excavation and is assembled in a cylindrical shape extending in the direction of excavation, and is a plane that intersects the central axis of the ring as a plurality of ring-shaped inner molds Assembling into a cylindrical shape in which the central axis of the cylinder is linearly extended by using both the end faces of the ring formed of The rail can be installed at the same position on the circumference of the inner mold frame even when the inner mold frame is assembled in a cylindrical shape whose center axis extends in a curved shape.

The perspective view which shows the relationship between a rail apparatus and an inner mold form (Embodiment 1). Sectional drawing of an inner mold form (Embodiment 1). The disassembled perspective view which shows a rail apparatus (Embodiment 1). The figure which shows the attachment method of a rail (embodiment 1). An exploded perspective view showing a rail device (embodiment 2). The figure which shows the attachment method of a rail (embodiment 2). An exploded perspective view showing a rail device (embodiment 3). The figure which shows the attachment method of a rail (embodiment 3). The perspective view which shows the relationship between a rail apparatus and an inner formwork (embodiment 4). An exploded perspective view showing a rail device (embodiment 4). FIG. 9 is a plan view showing a method for assembling a cylindrical inner mold (fifth embodiment). The perspective view which shows a ring-shaped inner formwork (Embodiment 5). FIG. 9 is a plan view showing a ring-shaped inner mold (fifth embodiment). The perspective view which shows the cylindrical inner mold frame in which the central axis of a cylinder extends linearly (Embodiment 5). The perspective view which shows the cylindrical inner mold frame in which the center axis | shaft of a pipe | tube extends in the shape of a curve (Embodiment 5). FIG. 9 is a plan view showing a method for assembling a cylindrical inner mold (fifth embodiment). FIG. 9 is a plan view showing a method for assembling a cylindrical inner mold (fifth embodiment). FIG. 9 is a plan view showing a method for assembling a cylindrical inner mold (fifth embodiment). Explanatory drawing of a level | step difference (Embodiment 5). Explanatory drawing of the inclination angle of the end surface of an inner mold form (Embodiment 5). Explanatory drawing which shows the relationship between a bolt through-hole and a volt | bolt (Embodiment 5). Explanatory drawing in the case of rotating an inner mold form (Embodiment 5). The perspective view which shows the conventional formwork piece. The figure which shows the conventional ring. The figure which shows the conventional ECL construction method. Sectional drawing which shows the internal structure in the conventional inner formwork.

Embodiment 1
The rail device according to the first embodiment will be described with reference to FIGS. 1 to 4. In addition, the same code | symbol is attached | subjected about the same part as the prior art example of FIG. 23 thru | or FIG. 26, and the description is abbreviate | omitted.

  As shown in FIG. 1 and FIG. 3, the rail device 50 for an inner mold according to the first embodiment includes a rail 51, a mounting portion 52, and a mounting means 53.

The rail 51 includes a pair of left and right rails 51L and 51R. As shown in FIG. 2, the rail 51 </ b> L has a cylindrical shape among a plurality of mold pieces 40 </ b> A that form a cylindrical inner mold frame 31 constructed so as to extend in the excavation traveling direction A within the tunnel cavity 21. The inner wall portion 40u of the mold piece 40A disposed between the lowermost point 31u and the leftmost point 31L of the inner wall peripheral surface 31a, which is a cylindrical section of the inner mold frame 31 (a section perpendicular to the central axis of the cylinder). It is detachably provided. The rail 51R is arranged between the lowermost point 31u and the rightmost point 31R of the inner wall peripheral surface 31a of the cylindrical inner mold 31 among the plurality of mold pieces 40A that form the cylindrical inner mold 31. It is detachably provided on the inner wall portion 40u of the formwork piece 40A.
The pair of left and right rails 51L and 51R are respectively installed at positions separated from the lowest point 31u of the inner wall peripheral surface 31a of the cylindrical inner mold 31 by the same distance on the left and right in the circumferential direction. The distance between the left and right rails 51L and 51R depends on the distance between the left and right wheels 44a and 44b of the carriage 44 on which the concrete placing device, the inner mold removing device, the mold piece conveying means 41 and the like are mounted. It is decided.

The mold piece 40A has the same configuration as that of the conventional mold piece 40 shown in FIG. 23 except that a mounting hole 45b penetrating the middle main beam 45a is formed in the middle main beam 45a.
The middle main beam 45a functions as an attachment plate to which the rail 51 is attached.
The mounting portion 52 is configured by a middle main girder 45a as a mounting plate provided on the inner wall portion 40u of the mold piece 40A constituting the inner mold 31 and a mounting hole 45b formed in the middle main girder 45a. .
The number of middle main beams 45a formed may be determined according to the size of the mold piece 40A. Further, the number of the mounting holes 45b and the distance between the mounting holes 45b; 45b adjacent to each other in the direction along the circumferential direction of the ring of the inner mold 31 may be arbitrarily determined. For example, an angle between a line connecting the center of the ring of the inner mold 31 and the mounting hole 45b adjacent to each other in the circumferential direction of the ring; .

As shown in FIG. 3, the attachment means 53 includes a base plate 55 having a curved plate surface 54, an engagement portion attachment plate 56 provided on one curved plate surface 54 a of the base plate 55, and an engagement portion attachment. An engagement portion 57 attached to the plate 56 and an engagement means 58 for engaging the engagement portion 57 inserted through the attachment hole 45b so as not to be detached from the attachment hole 45b. The curved plate surface 54 has an arcuate surface parallel to the lattice-shaped piece inner surface and the formwork surface 34 connected at the respective end edge surfaces of the piece joint plate 45, the middle main beam 45a, the ring joint plate 46, and the middle auxiliary beam 46a. It is formed.
The engaging portion 57 includes a shaft portion 59a that passes through the attachment hole 45b and a screw hole 59b that extends from the tip of the shaft portion 59a to the inside. The locking means 58 includes a locking lid member 60 and a set screw 61. As shown in FIG. 4, the locking lid member 60 is formed in a bottomed circular box shape with one end opening 60a, and includes a set screw through hole 60c penetrating the bottom wall 60b.

  The rail 51 is detachably provided on the other curved plate surface 54b of the base plate 55, for example. The rail 51 is, for example, an L-shaped long section in which the long edges of the two long plates are joined together so that the angle between the plate surfaces of the two long plates that are long in one direction is 90 °. It is formed by a scale member. When the base plate 55 is attached to the attachment portion 52, the rail 51 is installed so as to extend in a direction along the central axis of the cylinder of the cylindrical inner mold frame 31, and one of the long plates Becomes a rail surface (horizontal plane) 51a constituting the traveling path, and the other rectangular plate constitutes a support portion 51b that supports the rail surface 51a from below.

  The base plate 55 is formed so that the length along the circumferential direction of the inner mold 31 spans at least two middle sub-girder 46a; 46a adjacent to each other. However, the inner side of the mold piece 40A where the shaft portion 59a passing through the mounting hole 45b is positioned so that the locking lid member 60 and the set screw 61 can be attached to the shaft portion 59a of the engaging portion 57 passing through the mounting hole 45b. The space is formed so as not to block the space so that a hand can be inserted into the space.

As shown in FIG. 4, one curved plate surface of the base plate 55 is connected to the inner surface of the lattice-like piece connected by the tip end edge surfaces of the piece joint plate 45, the middle main beam 45a, the ring joint plate 46, and the middle auxiliary beam 46a. 54a is brought into surface contact and the shaft portion 59a of the engaging portion 57 is passed through the mounting hole 45b. The shaft portion 59a of the engaging portion 57 that penetrates the mounting hole 45b is fitted into the locking lid member 60 from the one end opening 60a side of the locking lid member 60, and the set screw 61 is passed through the set screw through hole 60c to the screw hole 59b. Conclude. Thereby, the set screw 61 connects the engaging portion 57 penetrating the mounting hole 45b and the locking lid member 60, and the one end opening edge surface 60d of the locking lid member 60 is the middle main part around the hole edge of the mounting hole 45b. Since it engages with the plate surface 45f of the girder 45a, the engaging portion 57 does not come off the mounting hole 45b. In this way, when the engaging portion 57 and the locking lid member 60 are connected by the set screw 61, the engaging portion 57, the mounting hole 45 b, and the locking lid material 60 are centered on the central axis of the set screw 61. Arranged coaxially. Accordingly, since the outer diameter of the circular box of the locking lid member 60 is formed larger than the hole diameter of the mounting hole 45b, the one end opening edge surface 60d of the locking lid member 60 is the middle main girder 45a around the hole edge of the mounting hole 45b. To the plate surface 45f.
By the above, the rail 51 is comprised so that attachment or detachment with respect to the middle main beam 45a is possible, and the rail 51 can be reliably fixed with respect to the middle main beam 45a. Further, since the inner mold frame 31 is constructed using the mold frame piece 40A provided with the mounting portion 52, the mounting position of the rail 51 in the direction along the circumference of the inner mold frame 31 can be selectively determined. become.
Further, since one curved plate surface 54a of the base plate 55 and the inner surface of the piece are brought into surface contact with each other, the load of the carriage 44 passing on the rails 51 is caused to be borne on the inner mold 31 without being concentrated on the base plate 55. Therefore, the stable rail 51 can be formed.
Further, the length of the locking lid member 60 in the direction along the central axis is changed, or a gap maintaining material such as a washer is interposed between the engagement portion mounting plate 56 and the plate surface of the middle main beam 45a. Thus, the mounting position of the rail 51 in the direction along the central axis of the inner mold 31 can be adjusted.
The number of attachment means 53 may be any number.

Embodiment 2
As shown in FIG. 5, the rail device 50 for an inner mold according to the second embodiment includes a rail 51, a mounting portion 52, and mounting means 53 </ b> A.
The attachment means 53A includes a base plate 55, a jack attachment plate 56A provided on one curved plate surface 54a of the base plate 55, and a jack 62 such as a hydraulic jack attached to the jack attachment plate 56A.
The jack 62 includes a piston cylinder 63 and a piston 65 that advances and retreats by hydraulic pressure supplied to and discharged from the piston cylinder 63 via a supply / discharge path (not shown), and one end side provided on one end side of the piston cylinder 63. The engaging part 63a and the other end side engaging part 65a provided in the front end side of the piston 65 which protrudes from the other end of the piston cylinder 63 are provided. For example, the peripheral surface portion of the piston cylinder 63 and the jack mounting plate 56A are connected by connecting means (not shown).
The one end side engaging portion 63a is formed to have a larger diameter than the diameter of one of the pair of mounting holes 45b; 45b formed in the pair of mounting plates 45a; 45a facing each other, and the shaft end surface 63b. One end side large diameter shaft portion 63c that contacts the plate surface 45g of one mounting plate 45a, and one end side small diameter shaft portion that protrudes from the shaft end surface 63b of the one end side large diameter shaft portion 63c and is inserted into one mounting hole 45b1. 63d.
The other end side engaging portion 65a is formed to have a diameter larger than the diameter of the other mounting hole 45b2 of the pair of mounting holes 45b; 45b, and the shaft end surface 65b contacts the plate surface 45h of the other mounting plate 45a. The other end side large diameter shaft portion 65c and the other end side small diameter shaft portion 65d protruding from the shaft end surface 65b of the other end side large diameter shaft portion 65c and inserted through the other mounting hole 45b are provided.
The diameter of the one-end-side small-diameter shaft portion 63d is formed to have a size that fits into one attachment hole 45b1. The other end side small-diameter shaft portion 65d has a diameter that fits into the other mounting hole 45b2. For example, the one-end-side small-diameter shaft portion 63d, the one-end-side large-diameter shaft portion 63c, the other-end-side small-diameter shaft portion 65d, and the other-end-side large-diameter shaft portion 65c are formed in a coaxial shape. The plate surface 45g of the one mounting plate 45a and the plate surface 45h of the other mounting plate 45a are plate surfaces facing each other.
In addition, since the rail 51, the attachment part 52, and the base board 55 are the same structures as Embodiment 1, description is abbreviate | omitted.

As shown in FIG. 6A, one curved plate surface 54a of the base plate 55 is brought into surface contact with the inner surface of the lattice-shaped piece, and the one end side small diameter shaft portion 63d of the one end side engaging portion 63a of the piston cylinder 63 is attached. The hole 45b1 is inserted into a fitted state, and the shaft end surface 63b of the one end side large diameter shaft portion 63c is brought into contact with the plate surface 45g of one mounting plate 45a. Next, as shown in FIG. 6B, the piston 65 of the jack 62 is extended by a jack control device (not shown), and the other end side small diameter shaft portion 65d of the piston 65 is inserted into the other mounting hole 45b2. At the same time, the shaft end surface 65b of the other end side large diameter shaft portion 65c is brought into contact with the plate surface 45h of the other mounting plate 45a.
Thus, by extending the piston 65, the contact force between the shaft end surface 63b of the one end side large diameter shaft portion 63c and the plate surface 45g of the one mounting plate 45a, and the other end side large diameter shaft portion 65c The contact force between the shaft end surface 65b and the plate surface 45h of the other mounting plate 45a is increased, and the jack 62 functions like a tension rod between the pair of mounting plates 45a; 45a, so that one end side small diameter shaft portion with respect to the mounting hole 45b1 The fitting state of 63d and the fitting state of the small diameter shaft portion 65d on the other end side with respect to the mounting hole 45b2 are maintained. Therefore, the rail 51 can be firmly and stably attached to the attachment portion 52.
As described above, the same effects as those of the first embodiment can be obtained. Further, in the second embodiment, since the jack 62 is used, the rail 51 can be firmly and stably attached to the attachment portion 52, and the work of fastening the set screw can be eliminated, so that the work can be facilitated.

Embodiment 3
As shown in FIG. 7, the rail device 50 for an inner mold according to the third embodiment includes a rail 51, an attachment portion 52, and attachment means 53 </ b> B.
The attachment means 53B includes a base plate 55, an engagement portion attachment plate 56 provided on one curved plate surface 54a of the base plate 55, and an engagement portion attached to one plate surface of the engagement portion attachment plate 56. 57, a jack 62A attached to the other plate surface of the engagement portion attachment plate 56, and an engagement means for engaging the engagement portion 57 inserted through the attachment hole 45b1 (45b) so as not to be detached from the attachment hole 45b1. 58.
The rail 51, the mounting portion 52, the base plate 55, the engaging portion mounting plate 56, the engaging portion 57, and the locking means 58 have the same configuration as that of the first embodiment, and thus the description thereof is omitted.
As the jack 62 </ b> A, a jack that does not include the one end side engaging portion 63 a of the piston cylinder 63 and the other end side engaging portion 65 a of the piston 65 as in the jack 62 of the second embodiment can be used. In the jack 62 </ b> A, for example, one end of the piston cylinder is attached to the other plate surface of the engagement portion attachment plate 56 so that the center axis of the engagement portion 57 and the center axis of the piston 65 coincide.
That is, the attachment means 53B of the third embodiment is inserted into one attachment hole 45b1 of the pair of attachment holes 45b; 45b formed in the middle main beam 45a; 45a as a pair of attachment plates facing each other. A joint 57, a jack 62A having a piston 65 which is inserted into the other mounting hole 45b2 of the pair of mounting holes 45b; 45b and can be advanced and retracted so as to engage with the other mounting hole 45b2, and one mounting The engaging part 57 inserted through the hole 45b1 is provided with a locking means 58 for locking so that it does not come off from the one mounting hole 45b1, and the jack 62A and the engaging part 57 and the locking means of the first embodiment are provided. 58 is used in combination.

As shown in FIG. 8A, the shaft portion 59a of the engaging portion 57 penetrating the one attachment hole 45b1 is fitted into the locking lid member 60 from the one end opening 60a side of the locking lid member 60, and the set screw 61 is fastened to the screw hole 59b through the set screw through hole 60c. As a result, the set screw 61 connects the engaging portion 57 penetrating the mounting hole 45b1 and the locking lid member 60, and the one end opening edge surface 60d of the locking lid member 60 is the middle main part around the hole edge of the mounting hole 45b1. Since it engages with the plate surface 45f of the girder 45a, the engaging portion 57 does not come off the mounting hole 45b1. Next, as shown in FIG. 8B, the piston 65 of the jack 62 is extended by a jack control device (not shown), and the piston 65 is inserted into the other mounting hole 45b2 in a fitted state.
In the third embodiment, the engaging portion 57 is attached to one attachment hole 45b1 so as not to deviate from the one attachment hole 45b1, and the piston 65 is attached to the other attachment hole 45b2 so as not to deviate from the other attachment hole 45b2. Since the rail 51 is attached, the same effect as the first embodiment can be obtained. In the third embodiment, since the engaging portion 57 and the locking means 58 and the jack 62A are used in combination, the rail 51 can be firmly and stably attached to the attaching portion 52.
One or more jacks 62 according to the second embodiment and jacks 62 </ b> A according to the third embodiment may be provided for one base plate 55.

Embodiment 4
As shown in FIG. 9, the rail device 50 for an inner mold according to the fourth embodiment includes a rail 51, a mounting portion 52, and mounting means 53 </ b> C.
The attachment means 53 </ b> C is configured such that a pair of rails 51 </ b> L and 51 </ b> R arranged at intervals along the circumferential direction of the inner wall surface of the inner mold 31, and a connection body 66 that connects the connection body 66 to the attachment portion 52. And an attachment member 67 for attachment.
Since the rail 51 and the mounting portion 52 have the same configuration as that of the first embodiment, detailed description thereof is omitted.

The connecting body 66 extends along the circumferential direction of the cylindrical inner mold 31 and is positioned in parallel with the mold surface 34 so that the middle main girder 45a as the first connecting reinforcing plate or the second connecting reinforcing plate. The arcuate body is connected to a mounting hole 45b formed in the middle sub-girder 46a by a connecting piece 69a, a bolt 80, a connecting tool 69 formed by a nut 81, and the like. This connector 69 constitutes the attachment member 67.
The connecting body 66 includes, for example, a connecting piece 70a and a bolt 80 at one end, a fixing tool 70 formed of a nut (not shown) or a left arc 51 having a left rail 51L attached by welding or the like, and a connecting piece at the other end 70b (see FIG. 10) and bolt 80, a fixing tool 70A similar to the fixing tool 70 formed by a nut (not shown) or the right arc-shaped body 73 to which the right rail 51R is attached by welding or the like, and the other end of the left arc-shaped body 71 And a central coupling body 74 that connects the other end of the right arc-shaped body 73. The connection between the left arcuate body 71 and the central coupling body 74 and the connection between the right arcuate body 73 and the central coupling body 74 are coupled by a coupling piece 75a; 75b, a bolt 80, a coupling tool 75 formed by a nut 81, and the like. .

For example, as shown in FIGS. 9 and 10, a bolt 80 is fastened to a screw hole 70e formed in the connecting piece 70a and a screw hole 51e formed in the support portion 51b of the left rail 51L, and the connecting piece 70a By fastening a nut (not shown) to the bolt 80 through a bolt 80 to a through hole 70f formed in the left arc-shaped body 71 and a through-hole 71f formed in one end of the left arc-shaped body 71, the left rail 51L and the left arc-shaped body 71 Are concatenated.
Further, a nut 81 is fastened to the bolt 80 through a bolt 80 through a through hole 71g formed in the other end of the left arcuate body 71 and a through hole 75e formed in the connecting piece 75a. Further, a nut 81 is fastened to the bolt 80 through a bolt 80 through a through hole 74e formed at one end of the central connecting body 74 and a through hole 75f formed in the connecting piece 75a. Thereby, the left arcuate body 71 and the central coupling body 74 are coupled.
Further, a nut 81 is fastened to the bolt 80 through a bolt 80 through a through hole 74f formed in the other end of the central connecting body 74 and a through hole 75g formed in the connecting piece 75b. Further, a nut 81 is fastened to the bolt 80 through a bolt 80 through a through hole 73e formed at one end of the right arcuate body 73 and a through hole 75h formed in the connecting piece 75b. Thereby, the center coupling body 74 and the right arc-shaped body 73 are coupled.
Then, a bolt (not shown) is fastened to a screw hole 70g formed in the connecting piece 70b and a screw hole (not shown) formed in the support portion 51b of the right rail 51R, and a through hole formed in the connecting piece 70a. The right rail 51L and the right arcuate body 73 are connected by fastening a nut (not shown) to the bolt through an unillustrated through hole formed at the other end of 70h and the right arcuate body 73. Is done.
For example, a nut 81 is fastened to the bolt 80 through a bolt 80 through a through hole 69b formed in the connecting piece 69a and a through hole 73f formed in the right arcuate body 73, and the connecting piece 69a is formed. By passing a bolt (not shown) through the through hole 69c and the mounting hole 45b and fastening a nut (not shown) to the bolt, the right arcuate body 73 is fixed to the middle main beam 45a.
Further, a nut 81 is fastened to the bolt 80 through a bolt 80 through a through hole 69d formed in the connecting piece 69a and a through hole 71h formed in the left arcuate body 71, and a through hole formed in the connecting piece 69a. The left arcuate body 71 is fixed to the middle main girder 45a by fastening a nut (not shown) to the bolt 80 through the bolt 80 through 69e and the mounting hole 45b.
As described above, the same effects as those of the first embodiment can be obtained. Moreover, since the connection body 66 can be divided | segmented into the left arc-shaped body 71, the center connection body 74, and the right arc-shaped body 73, the left arc-shaped body 71, the center connection body 74, and the right arc-shaped body 73 can be conveyed easily.
Note that the number of divisions of the coupling body 66 is not limited.
Further, the connecting body 66 may be constituted by one arcuate body that connects the pair of rails 51L and 51R arranged at intervals along the circumferential direction of the inner wall surface of the inner mold 31.

Embodiment 5
The rail devices of Embodiments 1 to 4 described above can be applied to an inner mold having the following configuration. In the case of the following inner molds, the shapes of each mold frame piece constituting one ring are all different, and the installation position of each mold frame piece may not be located at the same position on the circumference of the inner mold frame for each ring. For this reason, if a formwork piece with a fixed rail is used as in the prior art, the rail cannot be installed at the same position on the circumference. However, by using the rail device 50 that allows the rail 51 described in Embodiments 1 to 4 of the present invention to be detachable, the rail 51 can be positioned at the same position on the circumference of the inner mold frame even in the case of the following inner mold frame. It can be installed in.

For example, a circular ring-shaped inner formwork formed by arranging a plurality of metal arc-shaped formwork pieces so as to make one round of the inner peripheral surface along the inner peripheral surface of the tunnel cavity portion is directed toward the excavation progress direction A. As shown in FIG. 11, when assembling the cylindrical inner mold 1 (1A; 1B) extending in the excavation traveling direction A, as the circular ring-shaped inner mold, FIG. As shown in FIG. 5, when the inner ring form 2 having a circular ring shape in which both end faces 6; 6 of the ring formed by a plane intersecting the central axis 5 of the ring are not parallel to each other is used, the first to third embodiments of the present invention are used. 4 is used, the rail 51 can be installed at the same position on the circumference of the inner mold 1.
That is, as shown in FIG. 12, the circular ring-shaped inner mold 2 is provided with a plurality of arc-shaped mold pieces 3 so as to make one round of the inner peripheral surface along the inner peripheral surface of the tunnel cavity. Thus, the two end faces 6; 6 of the ring are formed so as not to be parallel to each other.
At least one of both end faces 6; 6 of the inner mold 2 is formed as one continuous inclined surface having an elliptical ring shape that cuts the cylinder so as to intersect the central axis of the cylinder. That is, at least one end face 6 is an elliptical ring sandwiched between a large-diameter ellipse centered on the center of the circular ring and an ellipse having a smaller diameter than the large-diameter having the same center as the large-diameter ellipse. Formed by one continuous inclined plane.
The circular ring-shaped inner mold 2 has a configuration in which the width W in the direction along the center axis 5 of the ring on the outer peripheral surface 8 of the ring is not uniform.
The circular ring-shaped inner mold 2 opposes the arc-shaped mold surface of the plurality of mold frame pieces 3 that forms the outer peripheral surface 8 of the ring of the inner mold 2 along the inner peripheral surface of the tunnel cavity portion. 23 in a state where the piece joint surfaces 12 of the piece joint plates 11 of the arc-shaped mold piece 3 installed adjacent to each other in the circumferential direction of the inner peripheral surface of the tunnel cavity are in contact with each other. It is formed by inserting a bolt (not shown) into a bolt passage hole (not shown) corresponding to the bolt passage hole 43a, and fastening a nut (not shown) from the tip of the bolt to closely connect the piece joint surfaces 12 to each other. The

Then, the end faces 6; 6 of the circular ring-shaped inner molds 2; 2 adjacent to each other in the front and back along the excavation traveling direction A are butted and joined to each other, and as shown in FIG. 14; FIG. A cylindrical inner mold 1A in which the central axis 7 of the cylinder extends linearly, or a cylindrical shape in which the central axis 7 of the cylinder extends in a curved shape as shown in FIG. 15; FIG. Assemble the inner mold 1B.
The ring joint surface 14 of the ring joint plate 13 of each of the mold frame pieces 3 is provided so that at least one end surface 6 of the inner mold frame 2 makes one round of the inner peripheral surface along the inner peripheral surface of the tunnel cavity. ... Are constituted by one continuous inclined surface having the above-described elliptical ring shape.
That is, in the state where the end faces 6; 6 of the circular ring-shaped inner mold 2 installed adjacent to each other in the tunnel excavation direction on the inner peripheral surface of the tunnel cavity are in contact with each other, the bolt through holes 43b in FIG. A bolt (not shown) is inserted into the corresponding bolt through hole 10, a nut (not shown) is fastened from the tip of the bolt, and the end surfaces 6; By assembling closely, the cylindrical inner mold 1A in which the central axis 7 of the cylinder extends linearly or the cylindrical inner mold 1B in which the central axis 7 of the cylinder extends in a curved shape is assembled. .
The plurality of circular ring-shaped inner molds 2 constituting the cylindrical inner mold 1A; 1B are the same.

For example, as shown in FIG. 13A, the circular ring-shaped inner mold 2 has one end face 6 and the other end face 6 that are at the same angle α with respect to a face 15 perpendicular to the center axis 5 of the ring. Those formed by planes intersecting at an angle smaller than 90 ° are used.
For example, as shown in FIG. 13 (b), the circular ring-shaped inner mold frame 2 has a surface 6a of one end surface 6 and the other end surface 6 that is perpendicular to the center axis 5 of the ring. You may use what was formed.
For example, as shown in FIG. 13 (c), the circular ring-shaped inner mold frame 2 has one end face 6 and the other end face 6 at different angles with respect to the face 15 perpendicular to the center axis 5 of the ring. You may use what was formed by the surface which cross | intersects α; β (α; β is an angle smaller than 90 °).

As shown in FIG. 11; FIG. 12, the circular ring-shaped inner mold frame 2 is formed between the both end faces 6; 6 and the maximum position a (referred to as the maximum width position a) between the both end faces 6; The minimum thickness position b (referred to as the minimum width position b) is provided at a position 180 degrees apart in the circumferential direction of the ring. That is, the circular ring-shaped inner mold 2 is configured such that the width of the outer peripheral surface 8 is gradually widened continuously from the minimum width position b to the maximum width position a.
And when assembling the cylindrical inner mold 1A in which the central axis 7 of the cylinder extends linearly, as shown in FIG. 14; FIG. The end faces 6; 6 of the adjacent inner mold frames 2 are joined so that the maximum width position a of the ring-shaped inner mold frame 2 and the minimum width position b of the other ring-shaped inner mold frame 2 coincide. . That is, a straight cylindrical inner mold 1A is assembled in which the maximum width position a and the minimum width position b are alternately repeated in the extending direction of the cylinder.
Further, when assembling the cylindrical inner mold 1B in which the central axis 7 of the cylinder extends in a curved shape, as shown in FIG. 15; FIG. The ring-shaped inner mold 2 and the other ring-shaped inner mold 2 are arranged so that the maximum width positions a of the ring-shaped inner mold 2 coincide with each other, and one of the ring-shaped inner molds 2 adjacent along the excavation traveling direction A The end faces 6; 6 of the adjacent inner mold frames 2; 2 are joined together so that the minimum width positions b of the other ring-shaped inner mold frames 2 coincide with each other. That is, the bent cylindrical inner mold 1B in which the maximum width position a continues and the minimum width position b continues in the extending direction of the cylinder is assembled.
As described above, the cylindrical inner mold 1A in which the central axis 7 and the outer peripheral surface 8 of the cylinder extending linearly are parallel to each other can be constructed. In this case, as shown in FIG. 11A, the total of the inclination angles a1; a2 of the end faces 6; 6 of the inner mold frames 2;
Furthermore, it is possible to construct a cylindrical inner mold 1B in which the central axis 7 and the outer peripheral surface 8 of the cylinder extending in a curved shape are parallel to each other.
Further, in this case, the cylindrical inner mold 1A in which the central axis 7 of the cylinder extends linearly, with the maximum width position a of the inner mold 2 and the minimum width position b of the inner mold 2 as marks, and the center of the cylinder The cylindrical inner mold 1B in which the shaft 7 extends in a curved shape can be easily assembled.

  That is, in the case where the plurality of inner molds 2; 2... Are joined so as to be sequentially adjacent to each other along the excavation traveling direction A, the cylindrical inner mold 1B in which the central axis 7 of the cylinder extends in a curved shape. In the case of assembling, the adjacent inner mold frames 2; 2 are joined with the maximum width position a and the minimum width position b being matched, but the cylindrical center axis 7 extends linearly. When assembling the inner mold 1A, the adjacent inner molds 2; 2 are adjacent to each other so that the maximum width a and the minimum width b coincide with each other. One inner mold frame 2 is bonded to each other in a state where the inner frame 2 is rotated by 180 ° around the center axis 5 of the ring with respect to a state where a and the minimum width position b coincide with each other.

That is, the ring-shaped inner mold frame 2 is used in which both end faces 6: 6 of the ring formed by a plane intersecting the center axis 5 of the ring are not parallel to each other, and the end surfaces of the inner ring-shaped frame 2; 6; By associating and joining 6 to each other, a cylindrical inner mold 1A in which the central axis 7 of the cylinder extends linearly is assembled, or a cylindrical shape in which the central axis 7 of the cylinder extends in a curved shape Since the inner mold 1B is assembled, there is no need to use a taper liner for adjusting the direction of travel of the inner mold, so there is no need to install and remove the taper liner, thereby improving the workability of the ECL method. Can do.
Also, with the maximum width position a of the inner mold frame 2 and the minimum width position b of the inner mold frame 2 as marks, a cylindrical inner mold frame 1A in which the central axis 7 of the cylinder extends linearly, and the central axis 7 of the cylinder are The cylindrical inner mold 1B extending in a curved shape can be easily assembled.
Further, since the cylindrical inner mold 1 is assembled using the same plurality of circular ring-shaped inner molds 2, that is, one type of circular ring-shaped inner mold 2, Management of the frame piece 3 can be facilitated.

  11; FIG. 23; FIG. 14; FIG. 15 shows the case where the inner mold 2 having the shape shown in FIG. 13 (a) is used, but FIG. 16 to FIG. The case where the inner mold frame 2 other than the shape shown in FIG. FIG. 16A illustrates a case where a cylindrical inner mold 1A in which the central axis 7 of the cylinder extends linearly is assembled using the inner mold 2 having the shape shown in FIG. 13B. 16 (b) illustrates the case of assembling a cylindrical inner mold 1B in which the central axis 7 of the cylinder extends in a curved shape using the inner mold 2 having the shape shown in FIG. 13 (b). FIG. 17A illustrates a case where a cylindrical inner mold 1A in which the central axis 7 of the cylinder extends linearly is assembled using the inner mold 2 having the shape illustrated in FIG. 17 (b) illustrates the case where the cylindrical inner mold 1B in which the central axis 7 of the cylinder extends in a curved shape is assembled using the inner mold 2 having the shape shown in FIG. 13 (c). FIG. 18 (a) shows that both end faces 6; 6 of the ring are formed by planes inclined in the same direction, and the center axis 7 of the cylinder is extended linearly by using a circular ring-shaped inner mold 2 which is not parallel to each other. FIG. 18B shows the case where the cylindrical inner mold 1A is assembled, and FIG. 18B shows a cylindrical inner mold in which the central axis 7 of the cylinder extends in a curved shape using the same inner mold 2 as FIG. The case where the formwork 1B is assembled is illustrated.

When assembling the cylindrical inner mold 1B in which the central axis 7 of the cylinder extends in a curved shape, the maximum width a and the minimum width b of the inner mold 2; 2 adjacent to each other along the excavation progress direction A It is not always necessary to match each other.
Further, when the inner mold 2 is joined so that the central axis 7 of the cylinder is bent from the state of the inner mold 1A in which the central axis 7 of the cylinder extends linearly, the inner mold 1A that extends linearly. The maximum width position a and the minimum width position b of the inner mold frame 2 positioned at the top of the inner mold frame 2 and the inner mold frame 2 to be joined to the inner mold frame 2 are not necessarily matched.
That is, the inner mold frames 2 adjacent to each other along the excavation progressing direction A; a state in which the maximum width positions a and the minimum width positions b of the two coincide with each other; 2; in a state where the maximum width position a and the minimum width position b of 2 coincide with each other, the inner mold frame 2 adjacent along the excavation traveling direction A; one inner mold frame 2 of 2 is the center of the ring Adjacent inner mold frames 2; 2 are joined together so as to be in a state of being rotated by a predetermined angle x with the shaft 5 as a rotation center.
By doing in this way, the advancing direction of the inner mold 1 can be changed with respect to the advancing direction of the cylindrical inner mold 1 so far.

  When the end surfaces 6; 6 of the inner mold frames 2; 2 adjacent to each other along the excavation traveling direction A are elliptical ring surfaces, the inner forms adjacent to each other so that the maximum width positions a and the minimum width positions b coincide with each other. When the molds 2; 2 are joined, or when the adjacent inner molds 2; 2 are joined so that the maximum width position a and the minimum width position b coincide, the elliptical ring surfaces to be joined However, when the inner mold frames 2; 2 adjacent to each other in a state other than these are joined, the outer mold surfaces 8; 8 of the inner mold frames 2; 2 joined so as to be adjacent to each other. A step δ (step δ which is the length in the direction along the end surface 6 of the inner mold 2) is generated between them.

The step δ is obtained by δ = 1/2 (D1-D) = (D / cos θ-D) / 2.
here,
D = outer diameter of the ring of the inner mold 2
D1 = the major axis dimension of the elliptical ring surface formed by the end face 6 of the inner mold 2 (see FIG. 19).

Note that, as shown in FIG. 21, a bolt thread formed on the end surface 6 that functions as a ring joint surface is used for joining the end surfaces 6; 6 of the inner mold frames 2; 2 adjacent to each other along the excavation direction A. The hole diameter (diameter) d1 of the hole 10 is formed larger than the shaft diameter d2 of the bolt 10a inserted into the bolt through hole 10. In general, with the center 10e of the hole of the bolt through hole 10 and the center 10f of the shaft of the bolt 10a aligned, the outer peripheral surface of the shaft of the bolt 10a and the inner peripheral surface of the hole of the bolt through hole 10 are The shortest distance h between them is set to be within 1.5 mm. In this case, the maximum allowable value δmax of the step δ (hereinafter referred to as the maximum allowable step value δmax) when the end faces 6; 6 of the inner mold frames 2; 2 are joined is approximately 1.5 mm.
The shortest distance h is equal to the outer peripheral surface 8 of the inner mold 2; 2; the ring joint surfaces 14; 14 of the mold pieces 3; 3 adjacent to each other along the excavation direction A so as not to cause a step δ between them. The center of the bolt through hole 10; 10 is within a range in which the bolt 10a can be passed through the bolt through hole 10; 10 from the state where the centers of the bolt through hole 10; The maximum distance that can be displaced. That is, a step δ is provided between the outer peripheral surfaces 8; 8 of the inner mold frame 2; 2 by shifting the centers of the bolt through holes 10: 10 joined so as to be adjacent to each other along the excavation traveling direction A. it can. Therefore, the ring joint surfaces 14; 14 of the mold pieces 3; 3 adjacent to each other along the excavation direction A can be joined by the bolt 10a and the nut, and the center of the bolt through hole 10; 10 can be shifted. The maximum distance is the step maximum allowable value δmax.

Therefore, the maximum step difference δmax = the shortest distance h = (d1−d2) / 2, and the inclination angle θ of the end surface 6 with respect to the surface 15 orthogonal to the central axis 5 of the ring of the inner mold 2 (see FIG. 20). ) Was determined by the following formula (1).
θmax = ACOS (1 / (2δmax / D + 1)) (1)
here,
δmax = maximum step allowable value between the outer peripheral surfaces 8; 8 of the inner molds 2; 2 when they are joined so as to be adjacent along the excavation direction A.
ACOS is an arc cosine.

  As can be seen from the equation (1), the maximum allowable inclination angle θmax of the end face 6 of the inner mold frame 2 depends on the shortest distance h that determines the maximum allowable step value δmax, and also the outer diameter D of the ring of the inner mold frame 2 Will be different.

  By using the inner mold 2 having the maximum allowable inclination angle θmax of the end surface 6 with respect to the surface 15 orthogonal to the center axis 5 of the ring of the inner mold 2 satisfies the above formula (1), It is possible to finely adjust the traveling direction of the inner mold frame 1 with respect to the traveling direction of the inner mold frame 1.

The following table shows the relationship between the outer diameter D of the inner mold 2 and the maximum allowable inclination angle θmax when the maximum allowable inclination angle θmax is calculated with the maximum step difference allowable value δmax of 1.5 mm in the equation (1). .
Outer diameter D (m) Maximum allowable inclination angle θmax
6 1.81
7 1.68
8 1.57
9 1.48
10 1.40
11 1.34
12 1.28
13 1.23
14 1.19
15 1.15
16 1.11
17 1.08
18 1.05
19 1.02
20 0.99

  According to the above table, for example, when the inner mold 2 having an outer diameter D = 10 m is used, the inclination angle θ of the end surface 6 with respect to the plane 15 orthogonal to the central axis 5 of the ring of the inner mold 2 is the maximum allowable inclination. If the angle θmax is 1.40 ° or less, the inner mold frames 2; 2 are joined so that the maximum width positions a and the minimum width positions b coincide with each other, or the maximum width position a and the minimum width position are joined. It is possible to change the traveling direction of the inner mold frame 1 with respect to the traveling direction of the cylindrical inner mold frame 1 up to that time without joining the inner mold frame 2; 2 so as to match b. .

  That is, as the inner mold 2, the inclination angle θ of the end surface 6 with respect to the surface 15 orthogonal to the center axis 5 of the ring of the inner mold 2 is formed to be equal to or less than the maximum allowable inclination angle θmax calculated by the above equation (1). If the inner frame 2 is used, the maximum width position “a” and the minimum width position “b” are matched, or the maximum width position “a” is matched with the minimum width position “b”. Thus, it is not necessary to join the inner mold frames 2; 2, and the traveling direction of the inner mold frame 1 can be changed with respect to the traveling direction of the cylindrical inner mold frame 1 so far.

  Further, as the inner mold 2, the inclination angle θ of the end surface 6 with respect to the surface 15 orthogonal to the center axis 5 of the ring of the inner mold 2 is formed to be equal to or less than the maximum allowable inclination angle θmax calculated by the above formula (1). In the case where the same is used, a state where the maximum width positions a and the minimum width positions b of the inner molds 2; 2 adjacent to each other along the excavation traveling direction A coincide with each other, or along the excavation progress direction A. Adjacent inner mold frames 2; one inner mold frame 2; 2 adjacent to each other along the excavation direction A in a state where the maximum width position a and the minimum width position b of two coincide with each other. The predetermined angle x can be arbitrarily set by joining adjacent inner mold frames 2; 2 so that 2 is rotated by a predetermined angle x about the center axis 5 of the ring. In this case, when the traveling direction of the inner mold 1 is changed with respect to the traveling direction of the cylindrical inner mold 1 until then, the traveling direction of the inner mold 1 can be finely adjusted.

The minimum angle x1 of the predetermined angle x is defined by a line 10b and a line 10b that connect the center 5c of the inner mold 2 and the centers of the adjacent bolt through holes 10; 10 formed on the end surface 6 of the inner mold 2. This is the angle between them (see FIG. 22).
Therefore, as shown in FIG. 22, when using the inner mold frame 2 including the end surface 6 provided with a plurality of bolt through holes 10 at a minimum angle x1 interval along the circumferential direction, it is adjacent along the excavation traveling direction A. In a state where the maximum width positions a and the minimum width positions b of the matching inner mold frames 2; 2 coincide with each other, or the adjacent inner mold frames 2; 2 along the excavation traveling direction A, the maximum width position a and the width For a state in which the minimum position b coincides, one inner mold 2 of the inner mold 2 adjacent to the digging progress direction A; 2 has a minimum angle x1 unit with the center axis 5 of the ring as the rotation center. The adjacent inner mold frames 2; 2 can be joined to each other so as to be in a rotated state, so that the traveling direction of the inner mold frame 1 can be finely adjusted.
For example, when it is going to change the advancing direction of the inner mold 1B, when trying to newly join the inner mold 2 to the inner mold 2 located at the tip of the inner mold 1B, these inner molds 2; 2 in which the maximum width position a and the minimum width position b are matched with each other while the inner mold frame 2 to be joined is rotated by the predetermined angle x about the central axis 5 as a rotation center. After the end surface 6 of the frame 2 and the end surface 6 of the inner mold frame 2 located at the tip of the inner mold frame 1B are brought into contact with each other and the end surfaces 6; 6 are joined together, the traveling direction of the cylindrical inner mold frame 1B is changed. Fine adjustments can be made.

  In the state where the maximum width position a and the minimum width position b match each other, or the maximum width position a and the minimum width position b match between the inner molds 2 adjacent to each other along the excavation traveling direction A; When joining in such a state, the inclination angle θ of the end face 6 with respect to the surface 15 orthogonal to the center axis 5 of the ring of the inner mold 2 is not limited to the above-described maximum allowable inclination angle θmax or less.

  In consideration of the production surface of the mold piece 3 and the like, it is preferable to assemble the cylindrical inner mold 1 using one type of circular ring-shaped inner mold 2, but for example, a plurality of types having different width dimensions An inner mold frame may be prepared and a cylindrical inner mold frame may be assembled using these plural types of inner mold frames.

  The above-described method for assembling the inner mold can be applied to the case of assembling a cylindrical inner mold using, for example, a rectangular ring-shaped inner mold rather than a circular ring-shaped inner mold.

  In the fifth embodiment, the ring-shaped inner mold frame 2 in which both end surfaces of the ring formed by a plane intersecting the center axis of the ring are not parallel to each other is used, and the end surfaces of the ring-shaped inner mold frame 2 are butted together. By joining, the inner mold 1A that is assembled into a cylindrical shape in which the central axis of the cylinder extends linearly, and the inner mold 1B that is assembled into a cylindrical shape in which the central axis of the cylinder extends in a curved shape The rail 51 can be easily attached to a desired position later using the rail device 50 described in the first to fourth embodiments. That is, no matter how the ring-shaped inner molds 2 are connected to each other, the rail 51 can be installed at a desired same position inside the inner mold 1A and the inner mold 1B.

  According to the present invention, as shown in FIG. 2, it becomes possible to stack the mold piece (40A; 3) without the rail 51 on the inner bottom surface of the inner mold (31; 1A; 1B). Since the stacking height of the frame pieces can be made uniform, the situation in which the part where the stacking height is increased by the rail collides with the formwork piece to be transported and the formwork piece cannot be transported forward as in the past. Can be prevented.

31; 1A; 1B inner formwork, 40A; 3 formwork pieces, 44 dolly,
45a Middle main girder (mounting plate), 45b Mounting hole, 50 rail device, 51 rail,
52 attachment part, 53; 53A; 53B; 53C attachment means, 57 engagement part,
58 locking means, 62 hydraulic jack (jack), 66 coupling body, 67 mounting member.

Claims (4)

A cylindrical inner mold frame is formed along the inner peripheral surface of the tunnel cavity formed by the excavation hole excavated from the natural ground, and forms a lining portion between the inner peripheral surface of the tunnel cavity. A rail of the inner mold that is attached to the inner mold and that extends along the central axis of the cylinder of the inner mold and forms a travel path of the carriage when moving the cart along the central axis of the cylinder of the inner mold, An attachment portion provided on the inner wall surface of the mold, and an attachment means for detachably attaching the rail to the attachment portion ;
The mounting portion is composed of a mounting plate provided on the inner wall surface of the inner mold and a mounting hole formed in the mounting plate,
An attachment means includes an engagement portion inserted through the attachment hole, and an engagement means for engaging the engagement portion inserted through the attachment hole so that the engagement portion does not come off from the attachment hole . Rail device. A cylindrical inner mold frame is formed along the inner peripheral surface of the tunnel cavity formed by the excavation hole excavated from the natural ground, and forms a lining portion between the inner peripheral surface of the tunnel cavity. A rail of the inner mold that is attached to the inner mold and that extends along the central axis of the cylinder of the inner mold and forms a travel path of the carriage when moving the cart along the central axis of the cylinder of the inner mold, An attachment portion provided on the inner wall surface of the mold, and an attachment means for detachably attaching the rail to the attachment portion;
The mounting portion is composed of a mounting plate provided on the inner wall surface of the inner mold and a mounting hole formed in the mounting plate,
The attachment means is equipped with a jack,
The jack includes one end side engaging portion provided on one end side of the piston cylinder, and the other end side engaging portion provided on the tip end side of the piston protruding from the other end of the piston cylinder,
The one end side engaging portion is formed to have a diameter larger than the diameter of one of the pair of mounting holes formed in the pair of mounting plates facing each other, and the shaft end surface contacts the plate surface of the mounting plate. One end side large diameter shaft portion, and one end side small diameter shaft portion protruding from the shaft end surface of the one end side large diameter shaft portion and inserted through one mounting hole,
The other end side engaging portion is formed with a diameter larger than the diameter of the other mounting hole of the pair of mounting holes, and the other end side large diameter shaft portion whose shaft end surface contacts the plate surface of the mounting plate, and the other projects from the axial end surface of the end side large diameter portion rail arrangement in the mold you, characterized in that a second end small-diameter shaft portion which is inserted into the other mounting hole. A cylindrical inner mold frame is formed along the inner peripheral surface of the tunnel cavity formed by the excavation hole excavated from the natural ground, and forms a lining portion between the inner peripheral surface of the tunnel cavity. A rail of the inner mold that is attached to the inner mold and that extends along the central axis of the cylinder of the inner mold and forms a travel path of the carriage when moving the cart along the central axis of the cylinder of the inner mold, An attachment portion provided on the inner wall surface of the mold, and an attachment means for detachably attaching the rail to the attachment portion;
The mounting portion is composed of a mounting plate provided on the inner wall surface of the inner mold and a mounting hole formed in the mounting plate,
The attachment means is inserted into one of the pair of attachment holes formed in the pair of attachment plates facing each other and inserted into the other attachment hole of the pair of attachment holes. And a jack having a piston which can be advanced and retracted so as to engage with the other mounting hole, and a locking means for locking the engaging portion inserted through the one mounting hole so as not to be disengaged from the one mounting hole. rail arrangement in the mold you wherein a. The cylindrical inner mold forms a ring-shaped inner mold by arranging a plurality of arc-shaped mold pieces so as to make one round of the inner peripheral surface along the inner peripheral surface of the tunnel cavity. The inner mold is sequentially assembled in the direction of excavation and is assembled in a cylindrical shape extending in the direction of excavation, and is a plane that intersects the central axis of the ring as a plurality of ring-shaped inner molds Assembling into a cylindrical shape in which the central axis of the cylinder is linearly extended by using both the end faces of the ring formed of it is or rail system of the inner mold according to any one of claims 1 to 3 the central axis of the cylinder is being in the formwork to be assembled in a cylindrical shape extending in a curve.

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