JP2006161334A - Composite segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent shear fracture and the separation of concrete and a steel material from each other from being caused by an excessive load, without causing heat distortion. <P>SOLUTION: In this composite segment 1, an outside frame body part 9 with an almost L-shaped cross section, which forms corners on four sides of an arc-shaped plate-like outer peripheral surface, and an inside frame body part 10, constitutionally identical to the frame body part 9, are arranged in an opposed manner. Upper and lower flanges 11a and 11b of an lattice 11 with an I-shaped cross section are each connected to plates 9b and 10b of both frame body parts. A bolt 13 is screwed as a dowel into the female screw parts of the respective flanges 11a and 11b of the lattice 11. Since connected in an unheated state, the bolt 13 adheres to the concrete 3 with high adhesion strength without causing welding distortion. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composite segment for tunnel lining formed by placing concrete inside a steel shell.

Conventionally, as a construction method used for the construction of a tunnel, a so-called shield method is generally used in which a substantially cylindrical wall body is constructed by connecting a plurality of arc plate segments to the inner surface of a tunnel-like excavation hole. Is. When connecting segments within a drilling hole, connect the segment joint and ring joint of each segment to the segment joint and ring joint of another segment, respectively. The connection is made by shifting the bolt pitch between them.
As segments used in the shield method, for example, three types of segments are known: a concrete segment, a steel (steel) segment, and a synthetic segment using a combination of steel (steel) and concrete. Among these segments, the synthetic segment is manufactured by filling a circular arc plate-shaped steel shell with concrete. In such a synthetic segment, there are some which are provided with a gibber or the like and covered with concrete in order to enhance the integration of the steel shell and the concrete and prevent slippage.

In general, in order to suppress the shearing force acting on the contact surface between steel and concrete, a stopper such as a bevel, for example, a bevel such as an angle, stud, or hook bar is fixed to the steel by welding or the like so as to cover the periphery. It is hardened with concrete. As a result, even if a large shearing force is applied to the contact surface between the steel material and the concrete, the effect of preventing slippage is enhanced.
Also in the tunnel lining segment, for example, as described in Patent Document 1, an inner steel shell that forms a hollow portion is provided in an arc-shaped outer steel shell surrounded by a plate-shaped steel material, and the inner surface of the outer steel shell is provided. There is a type in which a shift-preventive gibber is welded to the outer surface of the inner steel shell, and the space between the outer steel shell and the inner steel shell is filled with concrete. As a result, the steel shell and the concrete are integrated to enhance the slip prevention effect.
JP 7-42494 A

  However, since the above-described segment has a structure in which a divel is welded to a steel shell, welding distortion occurs between the divel and the steel shell due to heat during welding. Therefore, if an excessive load is applied to the segment and a large shearing force is applied between the gibber and the concrete, the adhesion between the gibber, steel shell, and concrete is reduced by the welding strain, so separation or shear failure occurs. There was a disadvantage that it occurred.

  In view of such circumstances, the present invention provides a synthetic segment capable of preventing shear fracture and separation of a gibber, steel shell, and concrete even when an excessive load is applied without causing welding distortion due to heat. The purpose is to do.

The synthetic segment according to the present invention is a synthetic segment in the shape of an arc plate formed by placing concrete in the steel shell, and the steel shell is a first frame that forms the corners of the four sides of the arc plate outer peripheral surface. Part and a second frame body part that forms the corners of the four sides of the arcuate plate-shaped inner peripheral surface, and a gibber is formed on the inner surface of the first frame part and / or the second frame part by non-heating means. The gibbels are characterized in that the concrete filled in the steel shell is covered closely.
According to the present invention, since the gibber is connected to the first frame part or the second frame part by the non-heating means, the strain due to heat is applied to the gibber, the first frame part, the second frame part or the like. Does not occur. Therefore, the filled concrete and the gibber and the steel shell are in close contact with each other, and even if a shearing force is applied due to an external load, the concrete does not separate from the gibber or the steel shell or cause a shear failure. Property, rigidity and strength can be secured.

Further, the synthetic segment according to the present invention is a synthetic segment having an arc plate shape formed by placing concrete inside the steel shell, and the steel shell is a first frame that forms corners of four sides of the outer peripheral surface of the arc plate shape. A connecting member that connects the first and second frame parts is provided, and the connecting member is formed by a body part and a second frame part that forms four corners of the arc-shaped inner peripheral surface. A non-heating means is connected to the diver, and the diver is characterized in that the concrete filled in the steel shell is closely covered.
According to the present invention, as in the case of the above-described invention, since distortion due to heat does not occur in the jibels, the connecting member, the first frame body portion, the second frame body portion, and the like, the concrete, the divel, the connecting member, and the steel shell It adheres firmly, and even if a shearing force is applied, the concrete does not separate from the gibber, the connecting member or the like, or shear fracture does not occur, and high integrity, rigidity and strength can be ensured.

The gibber includes a bolt screwed into the first and second frame parts or the connecting member, a pin press-fitted into the hole of the first and second frame parts or the connecting member, and the first and second frame parts. It may be at least one of a recess or a hole formed in the part or the connecting member.
If these dowels are provided on the steel shell or the connecting member, since no heat is applied, no distortion occurs in the dowel, the connecting member, the steel shell, or the like, and high adhesion and strength to the concrete can be imparted.

  According to the synthetic segment according to the present invention, the steel does not cause thermal distortion to the steel material such as a diver or a steel shell, and is firmly adhered to the concrete, and the concrete is a steel material such as a diver or a steel shell even if a shearing force is applied by an external load. From shearing or causing shear failure.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 6 show a composite segment according to the first embodiment. FIG. 1 is a perspective view of the composite segment, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. FIG. 4 is an exploded perspective view in which the skin plate is separated from the synthetic segment, FIG. 5 is a partial side view of the lattice, and FIG. 6 is a sectional view taken along line BB in FIG.
1 and 2, the composite segment 1 according to the present embodiment forms a tunnel lining body constructed on the inner wall of a tunnel having a large cross section by, for example, a shield method. (Hereinafter referred to as an arc plate shape). The synthetic segment 1 has a steel shell 2 and concrete 3 filled therein. The short side surface 4 of the composite segment 1 is provided with an inter-segment joint 5 for connection in the circumferential direction of the tunnel, and the inter-segment joint 5 has a relay joint portion 5a and an insert joint portion 5b. . Further, for example, four inter-ring joints 7 for connecting the tunnels in the axial direction are provided on the long side surface 6.

Next, the steel shell 2 of the synthetic segment 1 will be described with reference to FIGS. In the steel shell 2 shown in FIG. 3, an outer frame portion 9 (the first frame) is formed on the outer peripheral surface located on the natural mountain side in the state of being installed in the tunnel, and the outer peripheral body portion 9 (the first side) is formed on the four corners. One frame body part) is formed. The outer frame body portion 9 is formed such that the long side direction is curved into a substantially cylindrical peripheral surface shape, and the first plate portion 9a and the second plate portion 9b are orthogonal to each other so as to form a substantially L-shaped cross section. (See FIG. 2). The first plate portion 9a extends in the thickness direction of the composite segment 1, and the second plate portion 9b extends in the direction of the outer peripheral surface of the segment.
In addition, the inner peripheral surface located inside in the tunnel in the composite segment 1 is located at the corners of the four sides, forming the inner peripheral surface of the composite segment 1 at a position facing the outer frame body portion 9. An inner frame portion 10 (second frame portion) is formed. The inner frame body portion 10 is formed to be curved in a substantially cylindrical circumferential surface shape like the outer frame body portion 9 and is orthogonal to the first plate portion 10a and the second plate portion 10b so as to form a substantially L-shaped cross section. And is formed. The first plate portion 10a extends in the thickness direction of the composite segment 1, and the second plate portion 10b extends in the direction of the inner peripheral surface of the segment.
Both the outer frame body portion 9 and the inner frame body portion 10 are made of steel.

In the outer and inner frame portions 9 and 10 constituting these steel shells 2, a lattice 11 having an I-shaped cross section is connected to the inner side of the second plates 9 b and 10 b in the long side portions facing each other. That is, as shown in FIGS. 2, 3 and 5, the lattice 11 has a plate-like shape for connecting the flanges 11 a and 11 b respectively connected to the long side direction portions of the second plates 9 b and 10 b and connecting the flanges 11 a and 11 b. Alternatively, it is composed of a rod-shaped web 11c, and both ends in the longitudinal direction of the flanges 11a and 11b are connected to short-side portions of the second plates 9b and 10b. The web 11c is alternately inclined in the opposite direction so as to form a substantially triangular shape when viewed from the side, and is connected to the flanges 11a and 11b to exhibit shear resistance and bending resistance.
The lattice 11 is provided on each of the second plates 9b and 10b in the long side direction portions on both sides. The outer and inner frame parts 9 and 10 and the lattices 11 and 11 constitute the structure of the composite segment 1. In addition, since it is not necessary to provide the web 11c of the lattice 11, it is not necessary to include the web 11c in the structure.

As shown in FIGS. 2 and 5, in each lattice 11, bolts 13 are fastened to both sides of the web 11 c as flanges 11 a and 11 b by screwing. The coupling state of the bolt 13 and the flanges 11a and 11b is shown in the sectional view of FIG. In the drawing, a female screw hole 14 is perforated in the flanges 11a (and 11b) on both sides of the web 11c. The bolt 13 is completely screwed into the female screw hole 14 and the tip of the bolt 13 protrudes from the flange 11a. Instead, the head portion 13a with the increased diameter of the bolt 13 is held at a position away from the flange 11a by a predetermined distance.
As shown in FIG. 5, the bolts 13 are preferably fixed to both sides of the central portion between the two webs 11 c and 11 c that form, for example, a substantially triangular shape of the lattice 11.
As shown in FIG. 4, a skin plate 15 is fixed to the outer side of the outer frame portion 9 of the steel shell 2 by welding or the like.
In addition, a concave groove 17 is formed on the outer sides of the plates 9a and 10a in the thickness direction of the outer and inner frame portions 9 and 10 over the entire circumference, and a sealing material 18 is attached to the concave groove 17. ing. Thereby, when each synthetic segment 1 is connected by each joint part, ground water on the natural ground side does not leak into the tunnel.
The female screw hole 14 may be a bottomed hole that has a bag-like bottom and does not penetrate.

  Since the composite segment 1 according to the present embodiment has the above-described configuration, the bolt 13 is screwed and fixed to the female screw hole 14 of the flange 11a, 11b of the lattice 11 in the manufacturing process, so that welding, brazing, etc. The heat distortion does not occur in the steel material such as the bolt 13, the lattice 11, and the steel shell 2. Therefore, when the concrete 3 is filled and solidified in the steel shell 2 that is surrounded and held by a mold (not shown), the obtained composite segment 1 is composed of the solidified concrete 3, the bolt 13, the lattice 11, and the steel shell 2. It has high adhesion strength with the inner surface, and can exert high load resistance even if shearing force due to load acts on the contact surface between the concrete 3 and the bolt 13, the lattice 11, the steel shell 2, etc. The stopping effect and bending rigidity are high, and high integrity, strength and rigidity between the concrete 3 and each steel material can be secured.

Next, modifications of the synthetic segment 1 and the gibber according to the embodiment of the present invention will be described. However, the same or similar parts and members as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.
FIG. 7 is a longitudinal cross-sectional view of a main part of a lattice showing a first modified example of the connecting structure of the dowels. In FIG. 7, the lattice 11 has a pair of cylindrical through holes 20 and 20 formed on both sides of the web 11c of the flange 11a (and 11b). A pin 21 having a shaft portion 21 a having an outer diameter slightly larger than the inner diameter of the through hole 20 is press-fitted into the through hole 20. The pin 21 has a diameter-increased head portion 21a formed at the head portion of the shaft portion 21a. In a state where the pin 21 is press-fitted into the through hole 20, the tip of the shaft portion 21a does not protrude from the flange 11a to the opposite side. For this purpose, it is preferable to perform the press-fitting operation by placing the flange 11a on the rigid substrate when the pins 21 are press-fitted.
In the press-fitted state of the pin 21, a part of the shaft portion 21a and the head portion 21b protrude inside the flange 11a (upward in the drawing). Further, in order to facilitate press-fitting, it is preferable to chamfer the tip of the shaft portion 21a of the pin 21 or chamfer the corner of the pressure inlet of the through hole 20.
In addition, instead of the through hole 20, a bottom hole with a bag stopper may be provided.

Next, FIG. 8 is a main portion perspective view of a lattice showing a second modification of the structure of the gibber.
In the figure, a plurality of cylindrical holes 23a and 23b are arranged at predetermined intervals on the flange 11a (and 11b) of the lattice 11 as gibbers on both sides of the web 11c. Therefore, when the concrete 3 is placed in the steel shell 2 in the mold, the holes 23a and 23b are also filled, so that the effect as a jib can be exhibited. Even if the holes 23a and 23b are through holes, the concrete and the skin plate 15 do not allow the concrete to protrude from the holes 23a and 23b to be hardened.
The holes 23a and 23b may be bottomed holes, and the shape of the holes 23a and 23b is not limited to a cylindrical shape. The inner diameter of the holes 23a and 23b is larger than that of a star-shaped cylinder, a polygonal cylinder, or an opening. Alternatively, any shape such as a widened hole can be employed.

Next, FIG. 9 is a longitudinal sectional view similar to FIG. 2 showing a modification of the structure of the composite segment 1.
In the composite segment 1 shown in FIG. 9, a pair of lattices 11 are separately provided with respect to the long side portions of the second plate portions 9 b and 10 b of the outer frame body portion 9 and the inner frame body portion 10. The flanges 11a and 11b positioned in the vertical direction are configured such that both ends thereof are connected to the respective short side portions of the second plate 9b of the outer frame body portion 9 and the second plate portion 10b of the inner frame portion 10. . Thereby, the structure of the synthetic segment 1 is formed.
In each lattice 11, 11, a gibber such as a bolt 13 is fixed to the flanges 11a, 11b by non-heating means, as in the first embodiment or modification. The steel shell 2 is filled with concrete and solidified.
In each of these modified examples, the same operational effects as in the embodiment are exhibited.

In the above-described embodiment and modification, the lattice 11 in which the web 11c is arranged in a substantially triangular shape is disposed as a connecting member for connecting the outer frame body portion 9 and the inner frame body portion 10, but the web 11c The shape of is arbitrary. The lattice 11 is disposed in the long side direction of the steel shell 2, but may be disposed in the short side direction or the diagonal direction.
Further, the connecting member does not need to be a lattice 11 separate from the outer frame body portion 9 and the inner frame body portion 10, and is simply a plate similar to the web 11 c for connecting the outer frame body portion 9 and the inner frame body portion 10. You may comprise by a shape or a rod-shaped member.
In the above-described embodiment, the lattice 11 is connected to and integrated with the plates 9b and 10b of the outer frame body portion 9 and the inner frame body portion 10. It can also be said that it is connected to the inner frame body part 10. In this case, the diver is not limited to the second plate 9b, 10b in the direction of the outer peripheral surface or the inner peripheral surface, but may be connected to the first plate 9a, 10a in the thickness direction. Alternatively, a diver may be connected to the web 11c of the lattice 11.
Moreover, as a bevel, not only the volt | bolt 13, the pin 21, and the hole parts 23a and 23b which were shown by embodiment etc. but the thing of an appropriate shape is employable. The gibber may be connected to the steel by non-heating means that does not use heating such as welding or brazing. Moreover, what is necessary is just to connect a dowel to at least one part of the steel shell 2 or the lattice 11. FIG.

It is a perspective view of the synthetic segment by embodiment of this invention. It is the AA longitudinal cross-sectional view of the synthetic | combination segment shown in FIG. It is a figure which shows the structure of the synthetic segment shown in FIG. It is the perspective view which isolate | separated the skin plate from the synthetic | combination segment. It is a partial side view of a lattice. FIG. 6 is an enlarged longitudinal sectional view taken along line BB of the gibber portion of the lattice shown in FIG. 5. It is a figure which shows the 1st modification of a gibber. It is a figure which shows the 2nd modification of a gibber. It is a figure similar to FIG. 2 which shows the modification of a synthetic | combination segment.

Explanation of symbols

1 Composite segment 2 Steel shell 3 Concrete 9 Outer frame part (first frame part)
10 Inner frame (second frame)
11 Lattice (connection member)
13 Bolt (Giber)
14 Female screw hole 20 Press-fit hole 21 Pin (Giber)
23a, 23b hole

Claims (3)

In the synthetic segment that forms a circular arc plate formed by placing concrete inside the steel shell,
The steel shell is formed of a first frame body part that forms the corners of the four sides of the arcuate plate-shaped outer peripheral surface and a second frame body part that forms the corners of the four sides of the arc-shaped inner peripheral surface. ,
A diver is connected to the inner surface of the first frame part and / or the second frame part by non-heating means, and the diver is covered with concrete filled in a steel shell in close contact. The composite segment to be In the synthetic segment that forms a circular arc plate formed by placing concrete inside the steel shell,
The steel shell is formed of a first frame body part that forms the corners of the four sides of the arcuate plate-shaped outer peripheral surface and a second frame body part that forms the corners of the four sides of the arc-shaped inner peripheral surface. A connecting member for connecting the first and second frame parts is provided;
A synthetic segment characterized in that a divel is connected to the connecting member by non-heating means, and the concrete is closely covered with concrete filled in a steel shell. The dowel is a bolt screwed into the first and second frame parts or the connecting member, a pin press-fitted into a hole of the first and second frame parts or the connecting member, the first and second The synthetic segment according to claim 1 or 2, wherein the synthetic segment is at least one of a concave portion or a hole portion formed in the frame body portion or the connecting member.

Images