JP3615031B2 - Method and apparatus for manufacturing synthetic tunnel liner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a synthetic tunnel liner and an apparatus therefor.
[0002]
[Prior art]
The tunnel liner used for the shield construction method, etc., manufactures a concrete segment having a plurality of circumferences and assembles it in the tunnel to give a strong lining. There is a technique in which such a tunnel liner is cast into concrete inside a shell such as a thin steel plate or FRP, and the shell and concrete are integrated to form a synthetic tunnel liner.
[0003]
Synthetic tunnel liner is a composite liner that combines concrete and other materials. For example, a combined structure of a shell made of box-shaped thin steel sheet, FRP, etc. that forms the outer surface of the concrete, and the concrete filled therein. have. Such a synthetic tunnel liner can realize a mechanically rational optimum design by selecting and combining appropriate materials and shapes. Synthetic tunnel liners with outer peripheral surfaces and four side surfaces formed of steel plates, etc. have a smooth outer surface, and can produce thin concrete liners that are free of defects and defects such as bean concrete. In addition to eliminating the need for a formwork, there are many advantages such as the ability to precisely form the ridges and joints of the joints in the shell.
[0004]
On the other hand, a technique for manufacturing a tunnel liner by centrifugal molding is known. Normally, when forming a tunnel liner by centrifugal molding, a formwork is required. Therefore, it is not possible to manufacture a circular molding drum by arranging segments for one circumferential circumference. However, in the synthetic tunnel liner, it is possible to manufacture the shell by arranging the segments for one circumference on one circumference by bringing the side surfaces into contact with each other in the centrifugal drum.
[0005]
[Problems to be solved by the invention]
However, as a practical matter, conventionally, when a synthetic tunnel liner is formed by centrifugal molding, there has been no appropriate method for rationally attaching and removing the shell of one synthetic circumference to the inner circumference of the centrifugal molding drum.
An object of the present invention is to improve such problems, and when a synthetic tunnel liner is manufactured by centrifugal molding, a segment for one circumference is arranged in one circumference of a centrifugal molding drum. The present invention provides a method for manufacturing a synthetic tunnel liner and an apparatus therefor using a reasonable method for attaching and removing a shell.
[0006]
[Means for Solving the Problems]
The present invention has been developed to achieve the above-mentioned object, and the technical means is divided into a plurality of parts on one surface of a flexible flat sheet having a length substantially equal to the circumference of the centrifugal molding drum. Place each shell of the segment of the synthetic tunnel liner for one circumference at a position where the circumference of the circumference is unfolded and attach each, and lift both ends of the sheet to form a U-shape with the one side on the inside, The sheet is dropped into a lower frame of the centrifugal molding drum, and the sheet is rounded to form a cylinder in which the shells are in contact with adjacent ends on the inner circumferential surface of the sheet. Each shell and the sheet are stored in a centrifugal forming drum by connecting a frame, and concrete is placed in each shell and centrifugally molded, and each shell and concrete are integrated to synthesize one circle. Manufacturing a tunnel liner at the same time A method for producing a synthetic tunnel liner, wherein.
[0007]
An apparatus of the present invention capable of suitably carrying out the method of the present invention comprises a centrifugal molding drum and a flexible flat sheet having a width and length substantially equal to the inner peripheral surface of the centrifugal drum. The sheet incorporates a reinforcing material so that each shell of the segment of the synthetic tunnel liner for one circumference divided into a plurality of sections forms a single circumference by connecting the side surfaces in close contact with each other while the sheet is rolled up. An apparatus for producing a synthetic tunnel liner, comprising a mounting portion for attaching each shell using the grout hole of each shell and a lifting hole in the vicinity of both ends of the sheet.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 10 is a diagram in which a one-round tunnel liner is developed on a plane. The one-circumferential liner is, for example, rectangular (A) × 2, trapezoid (B) × 2, wedge-shaped (K) × 1. It is divided and manufactured.
[0009]
In the present invention, the synthetic tunnel liner is centrifugally molded. FIG. 8 is a schematic perspective view of the centrifugal molding drum 1 of the embodiment. The centrifugal molding drum 1 is a centrifugal molding drum 1 used as a mold for manufacturing a fume tube, and has a shape in which a cylinder is divided into an upper frame 2 and a lower frame 3 on a surface including a cylindrical axis. , It is bound by a bolt 4 to form a cylindrical shape, and a caching 5 is fitted to both ends and assembled. The centrifugal molding drum 1 is rotated around the cylindrical axis with the cylindrical axis horizontal on the rotating device, concrete is placed on the inner wall, and centrifugal force is applied to the concrete to centrifugally mold the tunnel liner.
[0010]
In the present invention, as shown in FIG. 9, a flexible plate having a vertical and horizontal dimension substantially equal to the inner peripheral surface of the centrifugal molding drum, for example, a rubber belt-like sheet 10 is used. Then, the shells of the synthetic tunnel liner segments for one circumference are attached to the sheet 10, and the sheet 10 is loaded into the centrifugal drum 1. The length dimension 12 of the sheet 10 may be matched to the outer peripheral length of the synthetic tunnel liner for one circumference, and the width dimension 11 of the sheet 10 may be slightly narrower than the width of the synthetic tunnel liner. As shown in FIG. 1, a synthetic segment shell 20 in which a synthetic tunnel liner is circumferentially divided into a plurality of pieces is attached to the sheet 10. In order to attach the shell 20, a fixing screw support 13 is provided.
[0011]
When the sheet 10 is rolled as shown in FIG. 3, the composite tunnel liner segment shells 20 for a plurality of divided circumferences are arranged in close contact with each other to form a circumference. As shown, a fixing screw support 13 for attaching each shell 20 of the synthetic tunnel liner segment for one circle is provided on one surface. Each shell is attached to the fixing screw support 13 with bolts using a grout hole provided in each shell.
[0012]
In addition, the sheet 10 includes suspension holes 14 at both ends in the longitudinal direction. The sheet 10 has a strength capable of being lifted by the suspension hole 14 with the synthetic segment of the product attached. For example, a synthetic resin or natural fiber canvas, a steel cord or a steel wire mesh or the like is incorporated as a reinforcing material in the sheet 10 to ensure the necessary strength. The surface has an outer surface coated with rubber, urethane or the like, and is a sheet that can withstand the compressive force due to centrifugal force. The thickness of the sheet 10 is set to a thickness that matches the clearance between the outer peripheral surface of the synthetic tunnel liner and the inner peripheral surface of the centrifugal molding drum. Moreover, this sheet | seat 10 has a softness | flexibility and has the softness | flexibility which can be wound in a cylindrical shape, with a synthetic | combination tunnel liner attached.
[0013]
As shown in FIG. 1, the sheet 10 is developed in a flat shape and placed on the ground. On the sheet 10, arc-shaped shells 20 of a plurality of one-circumferential synthetic tunnel liner segments are attached. Since there is a grout injection hole at substantially the center position of each shell 20, attached at a predetermined respective bolt fixing screw support 13 provided at the position of the seat 10 by utilizing this hole. This predetermined position is determined such that when the sheet 10 is rolled as shown in FIG. 3, the shells 20 are in contact with each other on the inner peripheral surface of the sheet 10 to form one circle.
[0014]
FIG. 11 illustrates a side view of the segment shell 20 of the synthetic tunnel liner that is an object of the present invention, and FIG. 12 illustrates a plan view thereof. The segment shell 20 has an arcuate box shape, has an inner peripheral side open, has a back plate 21 on the outer peripheral side, and has a strip-like side plate 22 and an arc plate-like side plate 23 around the back plate 21. . These back plates and side plates are made of steel plates, synthetic resin plates, FRP, or the like. The side plates 22 and 23 are precisely formed with tenons that engage with the adjacent shells and have grooves into which the sealing material is inserted. FIG. 14 shows a cross-sectional view of the abutting portions of the side plates 22a and 22b of the adjacent shells 20a and 20b illustrating this.
[0015]
A large number of reinforcing members 25, 26 connecting the two opposing side plates 23 are provided across the inside of the shell, ensuring the rigidity of the shell 20, and the concrete placed in the shell 20 and the inside thereof. Are integrated. Further, a grout injection hole 24 is formed in a substantially central portion of the shell 20. The grout injection hole 24 is formed of a cylinder 31 reinforced with a reinforcing member 34 and includes a lid 33 as shown in a detailed example in FIG.
[0016]
FIG. 15 shows the connection structure of the side plates 23a and 23b of the adjacent shells 20a and 20b. A spherical space 27 is formed in one side plate 23b, and alignment through holes are provided in the side plates 23a and 23b. A connecting expansion sleeve 41 having an inner diameter for driving the pin 40 is inserted into the through-hole.
Next, the manufacturing process of the synthetic tunnel liner according to the present invention will be described.
[0017]
As shown in FIG. 1, each arc-shaped shell 20 of a segment of a synthetic tunnel liner divided into a plurality of circles is mounted on a sheet 10 developed in a planar shape. Next, when the sheet suspension hole 14 is lifted, the sheet 10 becomes U-shaped as shown in FIG. As shown in FIG. 4, the sheet 10 is lifted in the lifting direction 15, and then the U-shaped sheet 10 is dropped into the lower frame 3 of the centrifugal drum as shown in FIG. 5. When the lifting tool is lowered as shown by the descending direction 16, the lower half of the sheet 10 becomes semicircular following the inner surface of the lower frame 3 of the centrifugal drum, and the segment of the synthetic tunnel liner of the U-shaped upper half of the sheet 10. The shell 20 is also displaced together with the sheet 10 while being oriented in a cylindrical shape. And as shown in FIG. 6, when the sheet | seat 10 becomes cylindrical shape, a lifting tool is removed. Each of the shells 20 is formed in a cylindrical shape in which adjacent ends are in contact with the inner peripheral surface of the sheet 10. FIG. 3 shows the state of each shell 20 and the sheet 10 when this state is reached.
[0018]
Next, as shown in FIG. 7, the upper frame 2 of the centrifugal molding drum is covered and the centrifugal molding drum is vertically connected, and the caching 5 is assembled as shown in FIG. 8 to complete the assembly of the centrifugal molding drum 1. At this time, the centrifugal molding drum 1 holds the shells 20 of the segments of the synthetic tunnel liner for one circumference divided into a plurality through the sheet 10 in a cylindrical shape.
[0019]
Thus, by the above-described method, it has become possible to easily and accurately attach one circular circumference of each arc-shaped shell in the centrifugal molding drum.
By rotating the centrifugal molding drum 1 and placing concrete in each shell 20, it is possible to centrifugally mold a synthetic tunnel liner in which each shell 20 and the concrete cast therein are integrated. Synthetic tunnel liners can be manufactured at the same time.
[0020]
When the centrifugal molding is completed and the concrete curing is finished, the centrifugal molding drum 1 is disassembled and the product is taken out in the reverse order of the above steps. That is, the upper frame 2 of the centrifugal molding drum 1 is removed, the suspension hole 14 of the sheet 10 is suspended, the tunnel liner is lifted together with the sheet, and the sheet 10 is spread over the soil, and the sheet 10 is developed in a flat shape. Remove the mounting bolt.
[0021]
In the above description, an example in which a synthetic tunnel liner for one circumference is arranged in the centrifugal molding drum and manufactured simultaneously is shown. However, depending on the size of the tunnel liner, the scale of the centrifugal molding drum, etc. Of course, a plurality of sets of synthetic tunnel liners can be simultaneously centrifugally molded, and the present invention is not limited to the above example.
[0022]
【Example】
The present invention was carried out under the following conditions.
Synthetic tunnel liner specifications:
Outer diameter: 2750mm
Thickness: 125mm
Width: 1000mm
Number of divisions: 5 (as shown in FIG. 10)
Expanded shape: (A) 2 rectangles, (B) 2 trapezoids, (K) 1 wedge shape Centrifugal forming drum:
Drum used: Propulsion fume tube construction cylindrical form frame Nominal dimensions: Fume tube inner diameter; 2400mm
Form diameter: 2810mm
One side clearance between liner outer diameter and mold inner diameter: 30mm
Sheet specifications:
Material: NBR with a hardness of 80 °
Reinforcement material: 2-4 natural fiber canvas Thickness: 29.5mm
Conventionally, it has been very difficult to mount a synthetic shell liner segment shell for one circumference in a centrifugal molding drum. However, according to the present invention, it has been very easy to mount.
[0023]
【The invention's effect】
According to the present invention, it becomes possible to easily attach each shell of the synthetic tunnel liner segment for one circle in the centrifugal molding drum at a time, achieving labor savings, highly efficient production, and one circle An accurate combination of the circumference segments with high accuracy can be manufactured at the same time.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which each shell is attached to a sheet of an embodiment.
FIG. 2 is a side view showing a state in which the sheet of the embodiment is lifted.
FIG. 3 is a side view showing a state in which the sheet of the embodiment is rolled into a cylindrical shape.
FIG. 4 is a process diagram of an example.
FIG. 5 is a process diagram of an example.
FIG. 6 is a process diagram of an example.
FIG. 7 is a process diagram of an example.
FIG. 8 is a perspective view of a centrifugal molding drum.
FIG. 9 is a development view of a sheet.
FIG. 10 is a development view showing a division of one circumference of a synthetic tunnel liner.
FIG. 11 is a side view of a synthetic tunnel liner segment shell.
FIG. 12 is a plan view of a shell of a segment of a synthetic tunnel liner.
FIG. 13 is a side view of a grout injection hole.
FIG. 14 is a cross-sectional view of a side contact portion of a shell of a segment.
FIG. 15 is a cross-sectional view of a side coupling portion of a shell of a segment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Centrifugal molding drum 2 Upper frame 3 Lower frame 4 Bolt 5 Caching 10 Sheet 11 Width dimension 12 Length dimension 13 Fixing screw support 14 Suspension hole 15 Lifting direction (arrow)
16 Lowering direction 20, 20a, 20b Segment shell 21, 21a, 21b Back plate 22, 22a, 22b Side plate 23, 23a, 23b Side plate 24 Grouting hole 25 Reinforcement material 26 Reinforcement material 27 Space 28 Pin hole 31 Tube 33 Lid 34 Reinforcement 40 pin 41 sleeve

Claims (2)

On one side of a flexible flat sheet having a length approximately equal to the circumference of the centrifugal drum, each shell of the segment of the synthetic tunnel liner divided into multiple circumferences was developed around one circumference. mounting each disposed at a position, by lifting the ends of the sheet and the U-shaped said the one surface facing inward, rounding the sheet plunge the seat in the lower frame of the centrifugal molding drum, said each shell A cylinder with adjacent end portions in contact with each other is formed on the inner peripheral surface of the sheet, and then the upper and lower frames are connected by covering the upper frame of the centrifugal molding drum, and the shell and the sheet are stored in the centrifugal molding drum. A method for producing a synthetic tunnel liner, wherein concrete is cast in a shell, centrifugally formed, and each shell and concrete are integrated to simultaneously produce a synthetic tunnel liner for one circle. A centrifugally formed drum, and a flexible flat sheet having vertical and horizontal dimensions substantially equal to the inner peripheral surface of the drum. The sheet includes a reinforcing material and is formed of a plurality of one-circumferential synthetic tunnel liners. Each shell of the segment is provided with a mounting portion for attaching each shell so as to form a circumference by tightly connecting the side surfaces in a state where the sheet is rolled , and a suspension hole is provided in the vicinity of both longitudinal ends of the sheet A device for producing a synthetic tunnel liner.

Images