JP6124171B2 - Synthetic segment manufacturing method - Google Patents

Description

  The present invention relates to a synthetic segment manufacturing method in which a concrete filling portion is integrated inside a steel outer shell.

  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.

  The composite segment includes a pair of arcuate end plates that are spaced apart from each other and a pair of circumferential end plates that connect between the side edges of both end plates. The outer opening is closed by a skin plate, and concrete filling is formed by filling the inside of the outer shell with concrete.

  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 method for producing a synthetic segment.

The feature of the invention according to claim 1 for solving the conventional problems as described above is that the concrete is placed in a hollow arc frame-shaped steel outer shell whose inner peripheral side is open and whose outer peripheral side is closed by a skin plate. In the synthetic segment manufacturing method of filling and forming a synthetic segment in which a concrete filling portion is integrated in the outer shell, a concrete filling hole is formed in the skin plate, and the concrete filling hole is formed. The outer shell body is formed on a mold base having an arc-shaped cross section on the upper surface using an outer shell body in which a water-stopping member made of an elastic material is provided on the inner surface side peripheral edge portion or inner peripheral surface portion. the inner peripheral surface is disposed so as to abut with the mold surface, thereby closing the inner circumferential side opening of the outer shell in the mold surface, a state in which the skin plate is directed upward, the In the state Concrete is poured into the outer shell through a cleat filling hole, the concrete filling hole is closed, and the concrete is filled until the water stop member is compressed, and then the filled concrete is solidified. This is to form a filling portion in the outer shell.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, one or a plurality of air vent holes are formed in the skin plate, and the inner peripheral edge of the air vent hole or the inner circumference of the air vent hole is formed. A water stop member made of an elastic material is provided on the surface portion, and the concrete is filled until the air vent hole is closed and the water stop member is compressed.

  The synthetic segment manufacturing method according to the present invention includes, as described above, filling concrete in a hollow arc frame-shaped steel outer shell having an inner peripheral side opened and an outer peripheral side closed by a skin plate. In the synthetic segment manufacturing method of forming a synthetic segment in which a concrete filling portion is integrated in the body, a concrete filling hole is formed in the skin plate, and an inner peripheral edge portion of the concrete filling hole or An outer shell body in which a water-stopping member made of an elastic material is provided on the inner circumferential surface portion is used, and the outer circumferential surface portion is placed on a mold base having a mold frame surface portion having an arc-shaped cross section on the upper surface portion. Installed so as to abut on the mold surface portion, and closed the inner peripheral side opening of the outer shell body with the mold surface portion, in that state, put concrete into the outer shell body from the concrete filling hole, Co After filling the concrete until the cleat filling hole is closed and the water blocking member is compressed, solidifying the filled concrete to form a filling portion in the outer shell body, Since the water is stopped by the water stop member, it is possible to prevent water from entering between the outer shell body and the filling portion even if the concrete filling hole is provided, so that so-called boat driving is possible and The concrete can be surely filled at both ends in the direction, and the inner peripheral surface portion of the filling portion is formed by the mold surface portion, so that it is easy to finish, and the synthetic segment can be manufactured efficiently and inexpensively.

  Further, in the present invention, one or a plurality of air vent holes are formed in the skin plate, and a water stop member made of an elastic material is provided on the inner surface side peripheral portion or the inner peripheral surface portion of the air vent hole, and the concrete is By filling until the air vent hole is closed and the water blocking member is compressed, the concrete can be suitably filled into the outer shell, and a high-quality synthetic segment can be manufactured. Further, the water blocking material can prevent water from entering the outer shell through the air vent hole.

(A) is a top view which shows an example of the synthetic segment manufactured with the manufacturing method 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 bottom view, (c) is the longitudinal cross-sectional view. (A)-(e) is a longitudinal cross-sectional view which shows the state of each process of the manufacturing method of the synthetic segment based on this invention. FIG. 4 is a partially enlarged longitudinal sectional view showing a state of a water stop member in FIG. 3.

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

  This synthetic segment 1 includes a hollow arc 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 middle filling portion 3. Are integrated to form a circular arc 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 circumferential end plates 5, which connect a pair of arc-shaped end plates 4, 4 and peripheral edges of both axial end plates 4, 4. 5 and a skin plate 7 that closes the opening on the outer peripheral side of the frame member 6. The frame member 6 is formed in a hollow arc frame shape in which the inner peripheral side of the frame member 6 is open and the outer peripheral side is closed by the skin plate 7. Has been.

  Each of the axial end plates 4 and 4 is formed in a circular arc plate shape from a steel plate, and is arranged in a ring axial direction at an arrangement facing each other. Reference numeral 8 in the figure denotes an insertion hole through which a connecting bolt for connecting segments adjacent in the tunnel axis direction is inserted.

  The circumferential end plates 5 and 5 are formed in a rectangular shape that is long in the segment ring axial direction by a steel plate, and both longitudinal side edges thereof are joined to the circumferential side edges of the axial end plates 4 and 4 by welding or the like, A frame member 6 is formed in a hollow arc frame shape by the axial end 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.

  The skin plate 7 is formed in a shape in which a steel plate is curved in an arc shape in accordance with the radius of curvature of the outer peripheral edge of the axial end plates 4, 4, and its four sides are the outer peripheral side edges of the axial end plates 4, 4 and It is joined to the outer periphery side edge of the circumferential direction end plates 5 and 5 by welding, respectively.

  The skin plate 7 is formed with a concrete filling hole 10 penetrating in the thickness direction, and the concrete is poured into the outer shell 2 through the concrete filling hole 10.

  The position of the concrete filling hole 10 is determined by the posture of the outer shell body 2 when the concrete is put into the concrete. When the outer shell body 2 is placed on a mold base 20 described later, the concrete filling hole 10 is the most. It is desirable to be arranged at a high position.

  An annular water stop member 11 made of an elastic material such as a rubber material is provided on the inner peripheral side of the skin filling hole 10 of the concrete filling hole 10.

  The skin plate 7 is formed with one or a plurality of air vent holes 12, 12 penetrating in the plate thickness direction. The air vent holes 12, 12 release air when filling concrete, and confirm the concrete filling state. It is supposed to be.

  The position of the air vent holes 12, 12 is not particularly limited, but it is preferably provided in a place where air compressed by the concrete introduced during the concrete filling operation is likely to accumulate. It is desirable that the position be higher than the portion.

  An annular water stop member 11 made of an elastic material such as a rubber material is provided on the inner peripheral side of the skin plate 7 of the air vent holes 12 and 12 in the same manner as the concrete filling hole 10.

  The water stop member 11 has a material, a cross-sectional shape, dimensions of each part, and the like set based on a shrinkage rate when the concrete composing the filling portion 3 is solidified, curing conditions of the concrete, and other various conditions. When the concrete constituting the outer shell body 2 is put into the outer shell 2 and compressed between the put concrete and the skin plate 7, the reaction force is applied to the skin plate 7 when the put concrete is solidified. Then, it is elastically deformed following the contraction of the concrete, and the gaps between the periphery of the concrete filling hole 10 and the filling portion 3 and between the air vent holes 12 and 12 and the filling portion 3 are sealed.

  Further, the outer shell 2 is provided with a plurality of ribs 13, 13... Projecting from the inner peripheral surface of the skin plate 7 in the ring radial direction at intervals in the circumferential direction. .. are fixed to the inner surfaces of the axial end plates 4 and 4 by welding or the like, and a large number of reinforcing bars 14, 14. The rebar lattice 15 is supported, and the ribs 13, 13... And the rebar lattice 15 are embedded in the concrete filling portion 3 so that the outer shell 2 and the filling portion 3 are integrated. It has become.

  Each of the ribs 13, 13... Is formed with a communication hole (not shown) that communicates both spaces separated by the rib 13 on the outer peripheral (skin plate 7) side, and the entire inner space of the outer shell body 2 is formed. The air vent holes 12 and 12 communicate with each other through the insertion hole.

  The filling portion 3 is formed in a circular arc shape from concrete and integrated in a state of being fitted inside the outer shell body 2. Further, on each of the four side edge portions on the inner peripheral surface side of the filling portion 3, there are formed connection concave portions 16, 16. The nuts are tightened on the connecting bolts inserted into the insertion holes 8 and 9 through the connecting recesses 16, 16 ..., and the nuts are fixed to the inner surfaces of the end plates 4 and 5, thereby connecting adjacent segments. It is supposed to be.

  Further, on the surface of the filling portion 3 facing the skin plate, projections 17 and 18 having shapes projecting in accordance with the positions of the concrete filling hole 10 and the air vent holes 12 and 12 are formed. , 18 close the concrete filling hole 10 and the air vent holes 12, 12 respectively.

  Next, a method for manufacturing the composite segment 1 as described above will be described based on the embodiment shown in 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. 3 (a) to 3 (b), the outer shell 2 is placed on the mold base 20 with the outer peripheral surface facing upward, so-called, Install in a state where concrete can be placed by lying down (outside facing).

  As shown in FIG. 3A, 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. Further, the outer shell body 2 is fixed to the mold base 20 so that the inner peripheral surface portion does not float above the mold surface portion 21 by a fixing tool (not shown).

  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. Is closed, and a mold frame surrounded by the axial end plates 4, 4, the circumferential end plates 5, 5, the skin plate 7 and the mold surface 21 is formed.

  Next, as shown in FIG. 3 (c), a funnel-shaped concrete charging member 23 is removably attached to the opening on the outer peripheral side of the concrete filling hole 10 formed in the skin plate 7, and each air vent is removed. A cylindrical air bleed member 24 is detachably attached to the openings on the outer peripheral side of the holes 12, 12, and as shown in FIGS. 3 (c) to 3 (d), the outer shell from the air bleed holes 12, 12. While discharging the air in the body 2, the concrete 25 is poured into the mold frame, that is, into the outer shell body 2 from the concrete filling hole 10.

  The portion formed by the air vent holes 12 and 12 and the portion separated by the rib 13 communicates with the air vent hole 12 through a communication hole (not shown) formed on the upper edge (skin plate) side of the rib 13. The air staying in the portion where the air vent hole 12 is formed and the portion separated by the rib 13 is also preferably discharged to the outside through the air vent hole 12 from the communication hole.

  The concrete filling operation is performed until the concrete filling hole 10 and the air vent holes 12 and 12 are closed and the water blocking members 11 are compressed, that is, through the air vent member 24 and through the air vent holes 12 and 12. Continue until it is confirmed that 25 overflows.

  At that time, the water stop member 11 is compressed between the original shape shown by the two-dot chain line in FIG. 4 and filled with the concrete 25 and sandwiched between the concrete 25 and the skin plate 7 until the state shown by the solid line in FIG. Elastically deforms.

  After the filling operation is completed, as shown in FIGS. 3D to 3E, the concrete charging member 23 and the air vent member are removed from the skin plate 7, and the concrete filling hole 10 and the air vent hole 12 are removed. , 12 is removed, and the surface of the concrete 25 exposed to the outer peripheral side through the concrete filling hole 10 and the air vent holes 12 and 12 is finished.

  In this state, the concrete 25 is cured and solidified to form the filling portion 3, and the outer shell 2 and the filling portion 3 are integrated.

  At this time, when the concrete 25 contracts as it solidifies, a reaction force is applied to the skin plate 7 to elastically deform following the contraction of the concrete 25 as shown by a one-dot chain line in FIG. The water stop member 11 seals the gap between the peripheral edge and the filling part 3 and between the air vent holes 12, 12 and the filling part 3.

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

  Since the synthetic segment 1 manufactured by the method of the present invention as described above is formed into the concrete filling portion 3 by so-called hitting (outside strike), the filling is exposed through the inner peripheral side opening of the outer shell portion. The inner peripheral surface of the portion 3 is molded by the mold surface portion 21 and finished beautifully, and the concrete 25 is sufficiently and surely filled at both ends in the circumferential direction of the segment.

  Further, in this synthetic segment 1, the gap between the periphery of the concrete filling hole 10 and the filling portion 3 and the gap between the periphery of the air vent hole 12 and the filling portion 3 are sealed by the water-stopping member 11, so-called “striking” Even if the concrete filling hole 10 and the air vent holes 12 and 12 are formed in the skin plate 7 for the purpose, it is possible to prevent the underground water and the like from entering the segment from the holes 10 and 12 during use.

  In the above-described embodiment, the example in which the water blocking member 11 is provided in the peripheral edge portion of the concrete filling hole 10 and the air vent hole 12 on the inner surface side of the skin plate 7 has been described, but the concrete filling hole 10 or the air vent hole 12 is provided. , 12 may be provided with an annular water stop member 11 to seal the gap between the inner peripheral surface of each hole and the concrete filled in the hole.

  Further, in the above-described embodiment, the coupling recesses 16, 16 ... are formed in accordance with the positions of the insertion holes of the end plates, and the couplings inserted through the insertion holes through the coupling recesses 16, 16 ... The example in which the nuts are fastened to the 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 member.

DESCRIPTION OF SYMBOLS 1 Composite segment 2 Outer shell 3 Filling part 4 Axial end plate 5 Circumferential end plate 6 Frame member 7 Skin plate 8,9 Insertion hole 10 Concrete filling hole 11 Water stop member 12 Air vent hole 13 Rib 14 Reinforcing bar 15 Reinforcing bar Lattice body 16 Connection recesses 17 and 18 Protrusion part 20 Formwork base 21 Formwork surface part 22 Peripheral wall part 23 Concrete feeding member 24 Air venting member 25 Concrete

Claims (2)

A hollow arc frame-shaped steel outer shell body whose inner peripheral side is open and whose outer peripheral side is closed by a skin plate is filled with concrete, and a synthetic segment in which the concrete inner filling portion is integrated into the outer shell body. In the manufacturing method of the synthetic segment to be molded,
A concrete filling hole is formed in the skin plate, and an outer shell body is used in which a water-stopping member made of an elastic material is provided on the inner peripheral side or inner peripheral surface of the concrete filling hole,
The outer shell is placed on a mold base having an arcuate cross section on the upper surface so that the inner peripheral surface of the outer shell comes into contact with the mold surface, and the inner peripheral opening of the outer shell is While closing at the formwork surface, the skin plate is directed upward,
In that state, the concrete was poured into the outer shell through the concrete filling hole, the concrete filling hole was closed, and the concrete was filled until the water stop member was compressed. A method for producing a synthetic segment, characterized in that a filling portion is formed in the outer shell by solidifying concrete.   One or a plurality of air vent holes are formed in the skin plate, a water stop member made of an elastic material is provided on the inner peripheral surface side or inner peripheral surface portion of the air vent hole, and the air vent hole is closed on the concrete. And the manufacturing method of the synthetic segment of Claim 1 filled until the said water stop member is compressed.

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