JP6124172B2 - Synthetic segment and manufacturing method thereof - Google Patents

Description

  The present invention relates to a synthetic segment formed by integrating a concrete filling portion inside a steel outer shell and a method for manufacturing the same.

  In tunnel construction using the shield construction method, in places where the load load on the tunnel structure due to earth pressure or water pressure is large, such as soft ground or tunnel curved parts, the load due to such earth pressure or water pressure can be handled. Because of this, high yield strength synthetic segments are widely used.

  This composite segment is formed on the outer side of a frame member composed of a pair of arcuate side plates formed in an arcuate shape spaced apart from each other and a pair of circumferential end plates that connect the side edges of both arcuate side plates. An outer shell body whose opening is closed by a skin plate is provided, and concrete filling portions are formed by filling concrete inside the outer shell body.

  The manufacture of such a synthetic segment uses an arc frame-shaped outer shell whose outer peripheral side is closed by a skin plate and only the inner peripheral side is open, so that the inner peripheral side opening is installed with the inner peripheral side opening facing upward. A method of placing concrete from the side opening, so-called boat driving (for example, see Patent Document 1).

JP 2001-58308 A

  However, the conventional method for manufacturing a synthetic segment by boat driving as described above has a problem that a great deal of labor is required for finishing the inner peripheral surface portion of the concrete filling portion, resulting in an increase in manufacturing cost.

  Also, when placing concrete by boat driving, both ends in the circumferential direction are higher than the center of the outer shell, so the concrete thrown into the outer shell is filled so that the center is dense, There was a risk that voids and the like might be formed at both ends of the segment in which the concrete was not sufficiently filled.

  In particular, when joint members for connecting segments adjacent in the circumferential direction are embedded at both ends in the circumferential direction of the segments, the formation of voids as described above may affect the strength of the joint member. was there.

  Therefore, in view of such a conventional problem, the present invention can efficiently and inexpensively manufacture a synthetic segment in which a concrete filling portion is integrated inside a steel outer shell. The purpose is to provide a synthetic segment and a method for producing the same.

The feature of the invention described in claim 1 for solving the conventional problem as described above is that a pair of arc-shaped side plates arranged at intervals so as to face each other, and the two arc-shaped side plates An outer shell body having a frame member formed in a hollow frame shape with a pair of circumferential end plates connecting between the side edges, and a concrete filling portion formed in the outer shell body, In a synthetic segment in which an outer shell and the filling portion are integrated , a frame-shaped reinforcing frame comprising a reinforcing plate projecting inwardly on the outer peripheral side inner surface of the arc-shaped side plate and the circumferential end plate A plurality of main bars, the body of which is integrally projected and arranged so as to be bridged between the reinforcing plates protruding from the respective arc-shaped side plates, and whose both ends are fixed to the reinforcing plate, respectively, and the circumferential end It is arranged so as to span between reinforcing plates protruding from the plate, and both ends are Respectively and a plurality of distribution power sources which are fixed to the reinforcing plate comprises a rebar grid of incorporating in a grid, fixed along the entire circumference on the inside surface of the reinforcing frame member than the arc radially outer peripheral side of the frame member A frame-shaped water-stopping member made of an elastic material, and exposing an outer peripheral surface of the filling portion through an outer peripheral side opening of the outer shell, and an outer peripheral side inner surface of the frame member and the filling portion It exists in the synthetic | combination segment which stopped water by the said water stop member.

According to a second aspect of the present invention, there is provided a pair of arc-shaped side plates arranged at intervals so as to be opposed to each other and a pair of circumferences connecting the side edges of both arc-shaped side plates. By placing concrete in an outer shell body having a frame member formed in a hollow frame shape with a directional end plate, a synthetic segment is formed in which the outer shell body and the concrete filling portion are integrated. the method of manufacturing a synthetic segments, wherein with arcuate side plates and circumferential consisting reinforcing plate projecting inwardly inside surface of the side end plates frame-like reinforcing frame is integrally projects, said each arcuate side plates It is arranged so as to be bridged between the protruding reinforcing plates, and is arranged so as to be bridged between the plurality of main bars fixed to the reinforcing plate at both ends and the reinforcing plates protruding from the circumferential end plate. , Both ends to the reinforcing plate A reinforcing bar lattice is formed by incorporating a plurality of fixed reinforcing bars in a lattice shape, and is fixed to the inner peripheral surface portion of the frame member on the outer peripheral side in the arc radial direction from the reinforcing frame body over the entire circumference . A frame having a frame-shaped water-stopping member made of an elastic material, using an outer shell body in which the inner peripheral surface side and the outer peripheral surface side of the frame member are open, and having a mold surface portion having an arcuate cross section on the upper surface portion The outer shell is placed on a stand so that the inner peripheral surface thereof is in contact with the mold surface, and the inner peripheral opening of the outer shell is closed by the mold surface, and the outer shell is in this state. Filling the concrete from the opening on the outer peripheral side into the outer shell until the water-stopping member is compressed, and then solidifying the filled concrete to form a filling portion in the outer shell. It is in.

  As described above, the composite segment according to the present invention includes a pair of arcuate plate-like side plates arranged at an interval so as to face each other, and a pair of connecting the side edges of both arcuate side plates. An outer shell body having a frame member formed in a hollow frame shape with a circumferential end plate, and a concrete filling portion formed in the outer shell body, the outer shell body and the filling portion And a reinforcing plate projecting inwardly on the inner side surface of the arc-shaped side plate and / or the circumferential end plate is integrally projected, and the inner peripheral surface portion of the frame member A frame-shaped water-stopping member made of an elastic material fixed to the outer surface, exposing the outer peripheral surface of the filling portion through the outer peripheral side opening of the outer shell body, and the inner surface of the frame member and the filling portion The outer shell body by stopping the water with the water stopping member High resistance against shearing force acting in the radial direction of the arc between the padding part and water can be reliably stopped without having a conventional skin plate. It can be realized with a few simple structures and can be manufactured at low cost.

  Further, in the present invention, a plurality of main bars arranged so as to be bridged between the reinforcing plates protruding from the respective arc-shaped side plates, and both ends thereof being fixed to the reinforcing plate, respectively, and protruding from the circumferential end plate Provided with a reinforcing bar lattice in which a plurality of reinforcing bars, both ends of which are fixed to the reinforcing plate, are arranged in a lattice shape. The force acting on the composite segment is appropriately dispersed through the reinforcing bar lattice, preventing stress from concentrating on one place and preventing cracking of the filling portion.

  Further, in the present invention, the end portions of the reinforcing plates adjacent to each other are fixed to each other, and the frame-shaped reinforcing frame body is formed on the inner side surface portion of the frame member, so that the outer shell body exhibits high rigidity, distortion and twisting. It is possible to prevent cracking of the filling portion made of integrated concrete.

The synthetic segment manufacturing method according to the present invention includes a pair of arc-shaped side plates arranged at intervals so as to face each other, and a pair of peripherals that connect between the side edges of both arc-shaped side plates. By placing concrete in an outer shell body having a frame member formed in a hollow frame shape with a directional end plate, a synthetic segment is formed in which the outer shell body and the concrete filling portion are integrated. In the synthetic segment manufacturing method, a reinforcing plate projecting inwardly projects from an inner side surface portion of the arc-shaped side plate and / or a circumferential end plate, and elastically fixed to the inner peripheral surface portion of the frame member. By using an outer shell body that is provided with a frame-shaped water-stopping member made of a material and that is open on the inner peripheral surface side and the outer peripheral surface side of the frame member, it is possible to perform concrete placement by so-called downcasting. it can.

  Accordingly, in the present invention, the outer shell is placed on a mold base having an arc-shaped cross section on the upper surface so that the inner peripheral surface of the outer shell comes into contact with the mold surface. The inner peripheral side opening is closed by the formwork surface portion, and in this state, the concrete is filled from the outer peripheral side opening of the outer shell body into the outer shell body until the water stop member is compressed, and then the filling is performed. By forming a filling portion in the outer shell body by solidifying the formed concrete, the water-stopping member is compressed by receiving a load accompanying the filling of the concrete, and between the inner surface of the outer shell body and the filling portion. Therefore, even if the skin plate is not provided, water can be prevented from entering the segment.

(A) is a top view which shows an example of the synthetic segment based on this invention, (b) is the bottom view, (c) is the longitudinal cross-sectional view. (A) is a top view which shows an example of the outer shell in FIG. 1, (b) is the longitudinal cross-sectional view. (A) is the elements on larger scale which show the outer shell in the state where the reinforcing bar lattice was removed, and (b) is the longitudinal section. It is a partial expansion perspective view which shows the corner part of an outer shell body same as the above. (A)-(d) is a longitudinal cross-sectional view which shows the state of each process of the manufacturing method of the synthetic segment which concerns on this invention. (A) is a partial expanded sectional view which shows the state of the water stop member in FIG.5 (c), (b) is a top view of the corner part.

  Next, an embodiment of the synthetic segment according to the present invention will be described based on the examples shown in FIGS. FIG. 1 shows an example of a composite segment according to the present invention, and reference numeral 1 in the figure is a composite segment.

  The synthetic segment 1 includes a hollow frame-shaped steel outer shell body 2 and a concrete filling portion 3 disposed inside the outer shell body 2, and the outer shell body 2 and the inner filling portion 3 are provided. They are integrated to form an arcuate plate shape, and are connected to each other in the circumferential direction to form an annular segment ring, and the segment ring is connected in the tunnel axis direction.

  As shown in FIG. 2, the outer shell body 2 includes a pair of arc-shaped side plates 4, 4 and a pair of circumferential end plates 5, 5 that connect the peripheral portions of the arc-shaped side plates 4, 4. The frame member 6 is formed in a hollow frame shape having openings 6a and 6b on the outer peripheral side and the inner peripheral side of the frame member 6, respectively.

  Each of the arc-shaped side plates 4 and 4 is formed in a circular arc plate shape from a steel plate, and is disposed in an arrangement facing each other with an interval in the ring axis direction. In the figure, reference numerals 7, 7... Denote insertion holes through which connecting bolts for connecting adjacent segments in the tunnel axis direction are inserted.

  Each arc-shaped side plate 4 has a plurality of rib-shaped side plate reinforcing plates 8 and 8 projecting inward along the circumferential direction on inner surfaces facing each other in parallel, spaced apart in the arc radial direction. Protrusions in the arrangement.

  The side plate reinforcing plate 8 is formed in a shape obtained by bending an elongated plate-shaped steel plate into an arc shape in accordance with the radius of curvature of the arc-shaped side plate 4, and one side edge is welded to the inner side surface of the arc-shaped side plate 4. It is firmly fixed and protrudes inward from the inner surface of the arc-shaped side plate 4, both circumferential edges are in contact with the inner surface of the circumferential end plate 5, and the inner side of the circumferential end plate 5 is welded or the like. It is firmly fixed to the side. The side plate reinforcing plate 8 is formed to have substantially the same thickness as the outer diameter of the reinforcing bars (main reinforcing bars 13, 13...) Described later.

  On the other hand, the circumferential end plates 5 and 5 are formed of a steel plate in a rectangular shape that is long in the segment ring axis direction, and both side edges in the longitudinal direction are joined to the circumferential side edges of the arcuate side plates 4 and 4 by welding or the like. The frame members 6 are formed in a hollow arc frame shape by the arc-shaped side plates 4 and 4 and the circumferential end plates 5 and 5. In the figure, reference numeral 9 denotes an insertion hole through which a connecting bolt for connecting adjacent segments in the tunnel axis direction is inserted.

  Each circumferential end plate 5 has a plurality of rib-shaped end plate reinforcing plates 10 projecting inward along the axial direction on the inner side surface in a parallel arrangement with intervals in the arc radial direction, Each of the reinforcing plates 8 and 8 is provided so as to be arranged inside the reinforcing plates 8 and 8 for both side plates.

  The end plate reinforcing plate 10 is formed in an elongated plate shape with a steel plate, and one side edge is firmly fixed to the inner side surface of the circumferential end plate 5 by welding or the like, and protrudes inward, and is axially end. The edges are in contact with the inner surface of the arc-shaped side plate 4 and are firmly fixed to the inner surface of the arc-shaped side plate 4 by welding or the like.

  As shown in FIG. 3 and FIG. 4, the side plate reinforcing plate 8 and the end plate reinforcing plate 10 are overlapped with each other, and the overlapped end portions are firmly fixed by welding. Frame-shaped reinforcing frame bodies 11a and 11b are formed in parallel arrangement with radial spacing on the inner side surface portion of the frame member 6 by a plate.

  Each reinforcing frame 11a, 11b is fixed with a reinforcing bar lattice 12 in which a large number of reinforcing bars are incorporated in a lattice shape, and the side plate reinforcing plate 8, the end plate reinforcing plate 10 and the reinforcing bar lattice 12 are made of concrete. By being embedded in the filling portion 3, the outer shell 2 and the filling portion 3 are firmly integrated.

  The reinforcing bar grid 12 is arranged so as to cross between the main bars 13, 13... Curved in the arc shape in the circumferential direction of the arc and the main bars 13, 13. Are formed in a lattice shape, and both ends of the main bars 13, 13 ... are fixed to the outer surface of the end plate reinforcing plate 10 by welding 13a or the like. Both ends of the bars 14, 14 ... are fixed to the outer surface of the side plate reinforcing plate 8 by welding 14a.

  Further, the outer shell 2 is provided with a water stop member 15 made of an elastic material such as rubber over the entire inner peripheral surface of the frame member on the outer peripheral side of the reinforcing frame 11.

  The water stop member 15 is formed in a rectangular frame shape in accordance with the shape of the frame member 6, and the outer peripheral surface portion is formed of an adhesive or the like on the frame member 6, that is, the inner side surfaces of the arc-shaped side plates 4 and the circumferential end plates 5. It is fixed to.

  Further, the water stop member 15 has a material, a cross-sectional shape, and the like set based on a shrinkage rate when the concrete constituting the filling portion 3 is solidified, a curing condition of the concrete, and other various conditions. When the constituting concrete is put into the outer shell body 2, it is sandwiched and compressed between the thrown-in concrete and the inner surface of the frame member 6, and when the thrown-in concrete solidifies, A reaction force is applied to the side surface and elastically deformed following the contraction of the concrete to seal the gap between the frame member 6 and the filling portion 3.

  The filling portion 3 is formed in a circular arc shape with concrete and integrated in a state of being fitted inside the outer shell body 2, and the outer peripheral surface 3 a and the inner peripheral surface 3 b are respectively opened on the outer peripheral side of the outer shell body 2. 6a and the inner peripheral side opening 6b are exposed.

  Further, on each of the four side edge portions on the inner peripheral surface side of the filling portion 3, concave portions 16, 16... For connection are formed according to the positions of the insertion holes 7, 9 of the end plates 4, 5. The nuts are fastened to the connecting bolts inserted through the insertion holes 7, 9 through the connecting recesses 16, 16 ..., and the nuts are fixed to the inner surfaces of the end plates 4, 5, thereby connecting the adjacent segments. It is supposed to be.

  The composite segment 1 configured as described above has the reinforcing plates 8 and 10 projecting from the inner side surfaces of the arc-shaped side plate 4 and the circumferential end plate 5, respectively. A high yield strength is obtained with respect to the shearing force generated in the arc radial direction, and the outer shell 2 and the filling portion 3 are reliably integrated.

  Further, the end portions of the side plate reinforcing plate 8 protruding from the arc-shaped side plate 4 and the end plate reinforcing plate 10 protruding from the circumferential end plate 5 are fixed to each other by welding to form the reinforcing frame 11. In addition, since the reinforcing frame 11 is firmly fixed to the inner side surface portion of the frame member 6, the outer shell 2 exhibits a high rigidity and has a structure in which distortion and torsion are unlikely to occur. It is possible to prevent cracking of the concrete filling portion 3.

  Further, the reinforcing frame 11 is fixed to the reinforcing plates 8 and 10 at both ends of the reinforcing bar lattice 12, that is, the main reinforcing bars 13, 13. The outer shell 2 and the filling portion 3 are more firmly integrated, and the force acting on the composite segment 1 is appropriately dispersed through the reinforcing bar lattice 12 to prevent stress from concentrating on one place. The cracking of the filling part 3 can be prevented.

  In the above-described embodiment, the example in which the water stop member 15 is provided only on the outer peripheral side of the reinforcing frame 11 a disposed on the outer peripheral side of the frame member 6 has been described. It is good also as a structure which is provided also in the inner peripheral side of the reinforcement frame 11b arrange | positioned at the circumference side, and water-stops by double, and two or more water-stop members 15,15 ... are included in the frame member 6. A plurality of peripheral surfaces may be installed at intervals in the arcuate direction.

  Next, the manufacturing method of the above synthetic segment 1 is demonstrated based on the Example shown in FIG. 5, FIG. In the figure, reference numeral 20 denotes a mold base 20 for forming the concrete filling portion 3.

  In order to manufacture the synthetic segment 1, first, as shown in FIGS. 5 (a) to 5 (b), the outer shell 2 is placed on the mold base 20 with the outer peripheral surface facing upward, so-called, Install in such a way that concrete can be placed on the surface (outside surface).

  As shown in FIG. 5A, the mold base 20 includes a mold frame surface portion 21 having an arcuate cross section on the upper surface portion and a peripheral wall portion 22 surrounding the periphery of the mold surface portion 21. By fitting the outer shell body 2, the outer shell body 2 is positioned with respect to the mold surface 21.

  The mold surface portion 21 is formed in a cross-sectional arc shape that bulges upward corresponding to the radius of curvature of the inner peripheral opening surface portion of the outer shell body 2, and the coupling recess portions 16, 16, not shown, are formed on the surface of the mold surface portion 21. A projection for molding is provided.

  Then, by placing the outer shell body 2 on the mold base 20 with the outer peripheral surface side facing upward, the mold surface portion 21 comes into contact with the inner peripheral surface portion of the outer shell body 2 and the outer shell body 2. The inner peripheral side opening 6b is closed to form a mold frame surrounded by the arc-shaped side plates 4 and 4, the circumferential end plates 5 and 5, and the mold surface part 21 and having an open upper surface.

  Next, as shown in FIGS. 5 (b) to 5 (c), the concrete 23 is poured into the mold frame, that is, into the outer shell 2 from the outer peripheral side opening 6 a of the outer shell 2.

  The filling operation of the concrete 23 is performed until the outer peripheral side opening 6a of the outer shell 2 is closed and the water stop member 15 is compressed, that is, the concrete 23 reaches the outer peripheral edge of the outer shell 2. Do until.

  At this time, by placing the concrete 23 by upturning, the concrete 23 flows from a high position toward a low position, so that the load by the concrete 23 is a frame member as shown by an arrow in FIG. The water-stopping member 15 installed on the entire inner circumference of the frame member 6 is moved from the original state to the concrete 23 and the frame member as the concrete 23 is filled. 6 is sandwiched between the inner side surfaces of 6 and fully compressed to be elastically deformed.

  After the above filling operation is completed, as shown in FIG. 5 (d), the excess concrete 23 overflowing from the outer peripheral side opening 6a of the outer shell 2 is removed, and the concrete exposed to the outer peripheral side through the outer peripheral side opening 6a. A finishing process is performed on the outer peripheral side surface 3a of 23.

  This finishing process is a part where the outer peripheral surface 3a is in contact with the natural ground, and it is not necessary to care about the appearance compared to the inner peripheral surface 3b exposed on the inner surface of the tunnel, so the finishing work is easily performed. be able to.

  In this state, the concrete 23 is cured and solidified to form the filling portion 3, and the outer shell 2 and the filling portion 3 are integrated.

  At that time, when the concrete 23 contracts as it solidifies, the water stop member 15 takes a reaction force on the inner surface of the frame member 6 and elastically deforms following the contraction of the concrete 23, and the outer shell 2 (frame member 6 ) Between the inner surface and the filling portion 3 is stopped by the water stop member 15 over the entire circumference of the frame member 6.

  Finally, after curing is completed, the manufactured synthetic segment 1 is removed from the mold base 20, and the operation is completed.

  The synthetic segment 1 manufactured by the method of the present invention as described above is exposed through the inner peripheral side opening 6b of the outer shell body 2 because the filling portion 3 made of concrete is formed by so-called down-striking (outer surface punching). The inner peripheral surface 3b of the filling portion 3 is molded by the mold surface portion 21 and finished beautifully, and the concrete 23 is sufficiently and surely filled into both end portions in the circumferential direction of the segment.

  Moreover, in this synthetic segment 1, since the gap between the inner side surface of the outer shell 2 and the filling portion 3 is sealed over the entire circumference by the water stop member 15, groundwater or the like can be used even without a skin plate. Can be prevented from entering the segment 1.

  In the above-described embodiment, the coupling recesses 16, 16... Are formed in accordance with the positions of the respective insertion holes 7, 9 of the frame member 6, and the insertion recesses 16, 16. The example in which the nuts are fastened to the inserted connecting bolts and the adjacent segments are connected by fixing the nuts to the inner surface of the end plate has been described. You may make it connect using the joint part structure which consists of a pair of female joint member.

DESCRIPTION OF SYMBOLS 1 Composite segment 2 Outer shell body 3 Filling part 4 Arc-shaped side plate 5 Circumferential end plate 6 Frame member 7 Insertion hole 8 Side plate reinforcement plate 9 Insertion hole 10 End plate reinforcement plate 11 Reinforcement frame body 12 Reinforcing bar lattice 13 Main reinforcement 14 Distribution bar 15 Water stop member 16 Concave recess 20 Mold frame 21 Mold frame surface 22 Peripheral wall 23 Concrete

Claims (2)

A pair of arc-shaped side plates arranged at an interval so as to face each other and a pair of circumferential end plates connecting the side edges of both arc-shaped side plates are formed in a hollow frame shape. In a synthetic segment comprising an outer shell body having a frame member, and a concrete filling portion formed in the outer shell body, wherein the outer shell body and the filling portion are integrated ,
A frame-shaped reinforcing frame body made of a reinforcing plate projecting inwardly projects from the arcuate side plate and the inner peripheral surface of the circumferential end plate on the outer peripheral side of the frame body, and protrudes integrally with each arc-shaped side plate. It is arranged so as to be bridged between the reinforcing plates, and both ends are arranged so as to be bridged between the plurality of main bars fixed to the reinforcing plate and the reinforcing plates protruding from the circumferential end plate, Reinforcing bar grids each comprising a plurality of power distribution bars fixed to the reinforcing plate in a grid pattern,
A frame-like water-stopping member made of an elastic material fixed over the entire circumference to the inner side surface on the outer circumferential side in the arc radial direction from the reinforcing frame body of the frame member;
The outer peripheral surface of the filling portion is exposed through the outer peripheral side opening of the outer shell body, and water is stopped between the outer peripheral side inner surface of the frame member and the filling portion by the water stopping member. A synthetic segment. A pair of arc-shaped side plates arranged at an interval so as to face each other and a pair of circumferential end plates connecting the side edges of both arc-shaped side plates are formed in a hollow frame shape. In the method of manufacturing a synthetic segment, by forming concrete in an outer shell body having a frame member, a synthetic segment is formed by integrating the outer shell body and the concrete filling portion.
A frame-shaped reinforcing frame body made of a reinforcing plate projecting inwardly on the inner side surface portion of the arc-shaped side plate and the circumferential end plate is integrally projected, and between the reinforcing plates projected from the arc-shaped side plates. Between the plurality of main bars fixed to the reinforcing plate and the reinforcing plate protruding from the circumferential end plate, and both ends of the reinforcing plate. and a plurality of distribution force muscle fixed with a rebar grid of incorporating in a grid, and is fixed over the entire circumference on the inner peripheral surface of the arcuate radially outer peripheral side of the reinforcing frame member of the frame member A frame-shaped water-stopping member made of elastic material, using an outer shell body in which the inner peripheral surface side and the outer peripheral surface side of the frame member are open,
The outer shell is placed on a mold base having a mold surface having an arc-shaped cross section on the upper surface so that the inner peripheral surface of the outer shell contacts the mold surface. Closed at the formwork surface,
In this state, after filling the concrete from the outer peripheral side opening of the outer shell until the water-stopping member is compressed into the outer shell, the concrete is filled into the outer shell by solidifying the filled concrete. A method for producing a synthetic segment, characterized by forming a filling portion.

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