JP2003082992A - Earthquake resistant joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake resistant joint structure for preventing a joint part from being damaged at earthquake time, and exhibiting joint part performance similar to performance before an earthquake even after the earthquake. SOLUTION: A female side engaging member 5 is composed of a slide stopper holding frame 20 constituting a male side engaging member 6 by fixing a locking member 3 having a locking projection 4 on the tip to a side surface of one segment 2, and fixed to a side surface of the other segment 1, and a slide stopper 12 movably supported in the tunnel radial direction by this holding frame 20, energized by a spring in the direction for closing an entering part of the locking member 3, and capable of locking the locking projection 4. An elastic body 34 is arranged between the slide stopper 12 and the holding frame 20 becoming the side for generating compressive force when tensile force acts on the joint part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a lining segment of a shield tunnel, and mainly relates to a joint portion between segment rings, particularly, to improve seismic resistance in the axial direction of the tunnel so that the segment rings are separated between them during an earthquake. The present invention relates to a seismic resistant joint structure between segment rings that can reduce the acting tensile force.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open No. 10109109/1999 is known as an excellent example of a joint structure for a lining segment used when excavating a shield tunnel.

Japanese Unexamined Patent Publication No. 11-101093 discloses, as shown in FIG. 12, a segment 1 facing a tunnel axis direction,
2, the locking member 3 of the male side engaging member 6 provided on one side surface 11 and the spring-biased pair of slide stoppers 1 of the female side engaging member 5 provided on the other side surface 10.
2 is pushed open to enter. The slide stopper 12 is movably held in the guide hole 18 of the slide stopper holding frame 20 of the female side engaging member 5 in the tunnel radial direction.

This prior invention solves the problem of inadequacy in the case of a displacement of the segments in the radial direction of the tunnel at the time of construction in the boltless type fitting joint portion of the segment. That is, according to this prior invention, positioning connection between the segments in the radial direction of the tunnel is easily performed,
In addition, the fitting joint structure can ensure the continuity of the segment ring against a large tensile force in the tunnel axial direction.

[0005]

However, in the conventional joint structure shown in FIG. 12, when the tensile force acts between the rings, the engaging member 3 and the slide stopper which receive the largest tensile force at the joint portion. Since all members of the holding frame 20 and the slide stopper 12 are made of steel, the following problems remain. That is, each of these members is composed of steel having rigidity because it is necessary to withstand a large tensile force, and is an inevitable structure.On the other hand, since all of them are composed of steel, each member is affected by seismic force. The structure was such that the members easily yielded and the connection function after the earthquake was prone to malfunction.

In the joint structure described above, in order to prevent the above-mentioned members from yielding due to seismic force, the locking member 3 and the slide stopper holding frame 2 in FIG.
It is necessary to control the tensile force generated in the joint part by the earthquake so that each member of 0 and the slide stopper 12 is equal to or less than the yield load during the earthquake.

An object of the present invention is to provide a seismic resistant joint structure that solves the above problems based on this finding.

[0008]

In order to achieve the above-mentioned object, the present invention is constructed as follows.

A first aspect of the present invention is an earthquake-resistant joint structure, wherein a locking member having a locking projection at its tip is fixed to a side surface of one segment to form a male side engaging member, and a side surface of the other segment. A slide stopper holding frame fixed to
The holding frame is movably supported in the radial direction of the tunnel, and is urged by a spring in a direction to close the entrance portion of the locking member, and a female stopper member and a slide stopper capable of locking the locking protrusion. And an elastic body is installed between the holding frame and the slide stopper on the side where a compressive force is generated when a tensile force acts on the joint portion.

A second invention is characterized in that a fiber reinforced rubber or an epoxy resin is used as the elastic body of the first invention.

A third invention is characterized in that, in the first or second invention, a thin steel plate is installed between the elastic body and the slide stopper.

According to a fourth aspect of the present invention, in the first to third aspects of the invention, the slide stopper rotation preventing means for restraining the contact surface of the slide stopper, which is in contact with the engagement member, is provided on the female side engagement member. It is characterized by being provided in. Here, as the slide stopper rotation preventing means, the slide stopper may be inserted into a guide frame that is slightly wider than the width of the slide stopper and that has a void portion that extends in the movable direction of the slide stopper. Further, as the slide stopper rotation preventing means, a rod-shaped guide member formed by penetrating the slide stopper along the movable direction of the slide stopper may be provided.

[0013]

According to the present invention, in the joint portion of the fitting (boltless) type segment, the elastic body is incorporated between the holding frame and the slide stopper on the side where the compressive force is generated when the tensile force acts. In the event of an earthquake, the holding frame, slide stopper, and locking member that form the main elements of the joint can be controlled so that the tensile force generated in the joint due to the earthquake is less than the yield load even during the earthquake. Therefore, it is possible to eliminate the risk that each member will yield due to seismic force, so that there will be no problems in the connection function after the earthquake.

When a large tensile force acts on the joint portion during a large earthquake, the slide stopper may rotate and only partially contact the elastic body, and the elastic body may not function sufficiently. Therefore, by providing the slide stopper rotation preventing means on the female side engaging member, the tensile force generated in the joint portion due to an earthquake can be controlled more effectively.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a seismic resistant joint structure of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1A is a schematic side view of a main part of the present invention, and FIG. 1B is a schematic front view thereof.
(A), (B), (C) are the first, second, and third of the male-side engaging member and the female-side engaging member in the main element of the joint structure of FIG.
5 is a sectional view of the connection process of FIG. 1, FIG. 3 is a sectional view taken along line aa in FIG. 1A, and FIG. 4 is a sectional view taken along line bb in FIG.
Is a diagram showing a tensile test result of an ordinary joint structure in a graph,
FIG. 6 is a graph showing a design value of elastic rubber used in the present invention, and FIG. 7 is a graph showing a calculated tensile rigidity value of the seismic resistant joint.

A sectional structure in which the seismic resistant joint structure of the present invention is applied to a tunnel segment will be described with reference to FIG. In the same figure, the segments 1 and 2 to be connected are composed of a steel shell 8 and concrete 9 filled therein, and on one side surface (web) 11 in the tunnel axial direction of the steel shell 8 of one segment 2, The male side engaging member 6 is provided,
One side surface (web) 10 in the tunnel axis direction of the steel shell 8 of the other segment 1 is fixed to one side surface of the slide stopper holding frame 20 of the female side engaging member 5 by welding.

Further description will be given with reference to FIGS. Figure 1
In (A) and (B), arrow D is the tunnel axis direction, arrow E is the tunnel radius direction, and arrow F is the tunnel circumferential direction. In each drawing, the male side engaging member 6 has an engaging member 3 having an engaging projection 4 protruding at the tip in the tunnel radius direction.
On one side 11 in the tunnel axis direction of one segment 2.
It is constructed by welding. The female engagement member 5 includes a pair of slide stopper holding frames 20 welded to one side surface 10 of the other segment 1 in the tunnel axis direction, and a pair of slide stopper holding frames 20 movably held in the tunnel radial direction by the holding frames 20. It is composed of a slide stopper 12. The pair of slide stopper holding frames 20 are made of a metal plate having a predetermined width, length, and thickness, and two guide holes 18 that are long in the tunnel radial direction are formed in the plate in the tunnel circumferential direction. It has been opened. One side surface of the slide stopper holding frame 20 is fixed to one side surface 10 of the other segment 1 in the tunnel axis direction by welding.

The pair of slide stoppers 12 are in the shape of a square shaft, and the opposite surfaces of both stoppers are formed with tapered surfaces 12A which are widened on the entrance side of the locking member 3. Also,
The slide stopper 12 is provided in the guide hole 18
It is freely movable in the radial direction of the tunnel without rattling. The slide stopper 12 is erected between the upper and lower end portions of the left and right slide stopper holding frames 20, and is biased in a direction in which the pair of slide stoppers 12 approaches between the connection frame 28 and the slide stopper 12 fixed by the fixing bolts 21. A spring 7 is provided.

Therefore, when connecting the rings,
When the eccentricity in the tunnel radial direction is 0 between the segments 1 and 2 facing each other in the tunnel axis direction, or when there is a slight eccentricity, both segments 1 and 2 are moved in the tunnel axis direction to approach each other. As a result, the locking member 3 enters the space between the pair of slide stoppers 12 while pressing and expanding the space between the pair of slide stoppers 12 against the elastic force of the spring 7, with the locking projections 4 engaging the slide stoppers 12. Do not get out after doing.

That is, when there is an eccentricity in the tunnel radial direction between the segments 1 and 2, the female side engaging member 5 and the male side engaging member 6 (that is, the locking member 3) are relatively displaced in the tunnel radial direction. Along with that, the pair of slide stoppers 12 that receive the locking member 3 are displaced inward and outward in the tunnel radial direction, but each slide stopper 12 is displaced by the biasing force of each of the pair of springs 7. It can be easily followed, and engages with the locking projection 4 of the locking member 3 mechanically and in alignment within the guide hole 18 at a position displaced in the tunnel radial direction. In other words, both members at this time (that is,
The engagement posture between the slide stopper 12 and the locking member 3) is
This is exactly the same as the normal engagement posture when the eccentricity of the segments 1 and 2 is zero.

Also, in the case where the opposing segments 1 and 2 are connected while being displaced in the circumferential direction, the locking member 3 is used.
Both side surfaces of the slide stopper holding frame 2
Since a predetermined gap 19 is formed between the locking members 3 and 0, the locking member 3 is located on either side of the middle position of the left and right slide stopper holding frames 20 in correspondence with the shift of the segments 1 and 2 in the tunnel circumferential direction. At a position deviated to one side, it enters between the pair of slide stoppers 12 and is mechanically and consistently locked to the slide stoppers 12. At this time,
The engagement posture of both members (that is, the slide stopper 12 and the locking member 3) is exactly the same as the normal engagement posture when the displacement of the segments 1 and 2 in the tunnel circumferential direction is zero. In FIG. 3, when the female side engaging member 5 and the male side engaging member 6 are engaged with each other, each fitting protrusion 16 of the segment main body
Are fitted into the respective fitting recesses 14.

The inter-ring joint structure of the fitting type (that is, boltless) of the synthetic segment is known, and in this joint structure, a tensile force is generated in the inter-ring joint due to the deformation in the tunnel axial direction which occurs during an earthquake. .

The present invention intends to construct a seismic resistant structure by preventing the ring-to-ring joint from being damaged by the tensile force, and the structural feature of the present invention is that the tensile force acts on the joint portion. At other times, the elastic body 34 is installed between the slide stopper 12 and the inner surface 20a of the holding frame 20 on the side where the compressive force is generated.

More specifically, referring to FIG.
By installing four elastic bodies 34 made of a total of elastic rubber or the like at the position shown in (B), it is possible to make the inter-ring joint and the elastic rubber series springs. That is, the tensile force generated in the joint can be controlled stably.

More specifically, in the joint structure described above, the displacement generated in the joint portion during an earthquake is calculated by the seismic design calculation. Therefore, when the design displacement acts, the tensile force acting on the joint portion is The elastic body may be designed so that each member of the locking member 3, the slide stopper holding frame 20, and the slide stopper 12 has a yield force or less,
From this viewpoint, the present invention installs the elastic body 34 between the holding frame 20 and the slide stopper 12 to reduce the rigidity of the inter-ring joint.

As described above, when the elastic body 34 is installed between the holding frame 20 and the slide stopper 12, the joint spring determined by the specifications of the locking member 3, the slide stopper holding frame 20, and the slide stopper 12, and the elastic force. Since the springs of the body 34 are arranged in series, if the stiffness of the joint spring is Kj and the stiffness of the elastic body 34 is Ke, the spring stiffness K of the seismic resistant joint of the present invention is 1 / K = 1 / Kj + 1 / Ke. Calculated.

If the displacement of the joint calculated by the seismic design calculation is δ, the tensile force P generated at the joint is P
= K × δ. If the tensile force P of the joint at the time of the earthquake calculated in this way is smaller than the yield force of each of the locking member 3, the slide stopper holding frame 20, and the slide stopper 12, the deterioration of the performance of the joint is prevented even after the earthquake. It becomes possible to do.

The thickness of the elastic body is set so that the rigidity of the elastic body 34 calculated by the above calculation can be realized.
The material may be designed and used.

However, when the slide stopper 12 and the elastic body 34 are in direct contact with each other in rigidity, when the slide stopper 12 is pressed against the elastic body 34 by a tensile force generated during an earthquake, the elastic body 34 is locally deformed. Occurs,
Since the expected performance may not be obtained in some cases, a thin steel plate 35 having a required thickness of about 2 mm to 20 mm is installed between the slide stopper 12 and the elastic body 34.
It is an effective method to control the local deformation of.

The effect of the thin steel plate 35 not only prevents local deformation of the elastic body 34, but also has the effect of smoothing the operation of the slide stopper when the joint is first engaged.

As the elastic body 34, any material can be arbitrarily selected as long as it can realize a required rigidity. However, in consideration of rigidity and durability, fiber-reinforced laminated rubber or epoxy resin is used. Are practical.

FIG. 5 is a graph showing the results of a tensile test of a conventional ordinary ring joint, and FIG. 6 is a design value of the compression rigidity of four elastic bodies made of laminated rubber with fiber reinforcement. . Further, FIG. 7 shows calculated values of tensile rigidity of the seismic resistant joint according to the present invention. That is, FIG. 7 shows a result of a tensile test performed on a seismic resistant joint in which a laminated rubber having a thickness of 7 mm and a thin steel plate having a thickness of 3 mm are installed as the elastic body 34 at four positions where the holding frame 20 and the slide stopper 12 are in contact with each other. Is. 5 to 7, the dotted line (a) is the reference value of the change in tensile load (kN) and ring joint elongation (mm) when the displacement of the joint is 3 mm, and the solid line (b) is the displacement of 5 mm. Indicates. In addition, in FIG. 5, the curve (C)
Shows the test result of the joint without elastic body, the straight line (d) in FIG. 6 shows the design value of the elastic body, and the curve (e) in FIG. 7 shows the tensile rigidity of the seismic resistant joint using the elastic body. The calculated value of is shown.

Table 1 below shows the tensile rigidity of the inter-ring joint (experimental value) and the seismic resistant joint (design value) when the displacement of the joint is 3 mm and 5 mm.

[0035]

[Table 1]

From the graphs shown in each figure and Table 1, FIG.
It can be seen that by installing the elastic bodies made of a total of four elastic rubbers at the positions shown in, it becomes possible to use the inter-ring joint and the elastic rubber as a series spring, and to stably reduce the tensile rigidity of the seismic resistant joint. That is, as can be seen by comparing FIG. 7 showing the calculated value by the joint structure of the present invention in which the elastic body 34 is installed between the holding frame 20 and the slide stopper 12 with FIG. 6 showing the test result by the conventional structure, it can be seen that If the generated displacement is the same, the tensile force generated in the seismic resistant joint is 1/2 to 1/1 / the tensile force generated in the conventional joint.
It can be reduced to about 3.

In the present invention, it is conceivable to install an elastic body between the slide stopper 12 and the locking projection 4 of the locking member 3 to reduce the tensile force generated during an earthquake. Since the effect of reducing the tensile force varies depending on the positional relationship between 12 and the locking member 3, and it is difficult to secure stable performance, the installation position of the elastic body 34 according to the present invention is preferable.

<Second Embodiment> FIGS. 8 to 9 are views showing a seismic resistant joint structure with a slide stopper rotation preventing means according to a second embodiment of the present invention. In the second embodiment, the space 3 is formed from both sides of the seismic resistant joint structure of the first embodiment.
A guide frame 37 having 7a is attached to the slide stopper 12. The guide frame 37 is
The holding pin 39 is fixed to the outside of the slide stopper 12 so as not to fall off from the slide stopper 37. In addition, in the following embodiments, the same components as those in the above-described first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

As shown in FIG. 9, in the guide frame 37 of the second embodiment, two linear elongated guide holes 37a (voids) through which the slide stopper 12 can be inserted are opened vertically. The width of the guide long hole 37a is set to be slightly wider than the width of the slide stopper 12. Further, the length of the guide elongated hole 37a is set to such a length that the slide stopper 12 can be moved in the tunnel radial direction at least until the male side engaging member 6 can be inserted. Note that the guide long hole 37a may be one guide long hole that is vertically integrated.
Further, the guide frame 37 may be formed in an H shape or a U shape so as to open a part of the void [not shown].

With the above structure, the pair of slide stoppers 12 can be moved in the tunnel radial direction along the guide long holes 37a, while the contact surfaces of the slide stoppers 12 with the locking members 3 are the locking members 3. Is restrained in a state of facing. Therefore, the rotation of the slide stopper 12 due to the pulling of the male side engaging member 6 is prevented.

<Third Embodiment> FIG. 10 to FIG.
FIG. 8 is a diagram showing a seismic resistant joint structure with a slide stopper rotation preventing means according to a third embodiment of the present invention. Third
In the embodiment, rod-shaped guide members 38 formed by penetrating the slide stopper 12 along the movable direction of the slide stopper 12 are provided at both ends of the slide stopper 12 of the seismic resistant joint structure of the first embodiment. Pressing pins 39 are inserted through the upper and lower ends of the guide member 38, and are fixed so that the guide member 38 does not fall off the slide stopper 12. With this configuration as well, the pair of slide stoppers 12 can move in the tunnel radius direction, while each slide stopper 12 is constrained in a state where the contact surface with the locking member 3 faces the locking member 3. Therefore, the slide stopper 1 by pulling the male side engaging member 6
The rotation of 2 is prevented. The guide member 38 may have any shape such as a columnar shape, a prismatic shape, and a cylindrical shape.

[0042]

According to the seismic resistant joint structure of the present invention, by installing an elastic body between the holding frame and the slide stopper on the side where a compressive force acts during an earthquake, the tensile force generated in the joint during an earthquake can be prevented. It has become possible to suppress the yield strength of each component member to less than that, prevent the joint part from being damaged during the earthquake, and exhibit the same joint part performance after the earthquake as before the earthquake. . By arranging the thin steel plate between the slide stopper and the elastic body, the above-mentioned effect is further secured.

When a large tensile force acts on the joint portion during a large earthquake, the slide stopper may rotate and only partially contact the elastic body, and the elastic body may not function sufficiently. Therefore, by providing the slide stopper rotation preventing means on the female side engaging member, the tensile force generated in the joint portion due to an earthquake can be controlled more effectively.

[Brief description of drawings]

FIG. 1A is a schematic side view of a main part of the present invention, and FIG. 1B is a schematic front view.

2 (A), (B), and (C) are first, second, and third couplings of a male side engaging member and a female side engaging member in the main element of the joint structure of FIG. It is a process drawing.

FIG. 3 is a sectional view taken along the line aa in FIG.

FIG. 4 is a sectional view taken along line bb in FIG. 1 (B).

FIG. 5 is a graph showing a load-displacement relationship as a result of a tensile test of an ordinary joint structure.

FIG. 6 is a graph showing design values of elastic rubber used in the present invention.

FIG. 7 is a graph showing calculated values of tensile rigidity of the seismic resistant joint according to the present invention.

FIG. 8 is a schematic side view of the second embodiment.

FIG. 9 is a schematic front view of a second embodiment.

FIG. 10 is a schematic side view of a third embodiment.

FIG. 11 is a schematic front view of a third embodiment.

FIG. 12 is a tunnel axial direction cross-sectional view showing a conventional inter-ring joint structure of a segment fitting type.

[Explanation of symbols]

1 segment 2 segments 3 locking member 4 Locking protrusion 5 Female side engaging member 6 Male side engaging member 7 spring 8 steel shell 9 concrete 10 Tunnel axial side 11 Tunnel axial side 12 Slide stopper 14 Fitting recess 16 Insertion ridge 18 Guide hole 19 Gap 20 Slide stopper holding frame 21 fixing bolt 28 connecting frame 34 Elastic body 35 thin steel plate 36 Slide stopper rotation prevention means 37 Guide frame 37a long guide hole (void) 38 Guide material 39 Holding pin

Continued front page    (72) Inventor Akira Kawamura             2-6-3 Otemachi, Chiyoda-ku, Tokyo New Japan             Steelmaking Co., Ltd. F-term (reference) 2D055 BA01 GC04

Claims (7)

[Claims] 1. A male side engaging member is constructed by fixing a locking member having a locking projection at its tip to a side surface of one segment,
A slide stopper holding frame fixed to the side surface of the other segment, movably supported in the radial direction of the tunnel by the holding frame, and spring-biased in a direction of closing the entrance portion of the locking member. A female side engaging member is composed of a slide stopper capable of locking the protrusion, and an elastic body is installed between the holding frame and the slide stopper, which is a side where a compressive force is generated when a tensile force acts on the joint portion. Seismic resistant joint structure characterized by being constructed. 2. The seismic resistant joint structure according to claim 1, wherein a fiber reinforced rubber or an epoxy resin is used as the elastic body. 3. The seismic resistant joint structure according to claim 1, wherein a thin steel plate is installed between the elastic body and the slide stopper. 4. The female engaging member is provided with slide stopper rotation preventing means for restraining the engaging member contact surface of the slide stopper so as to face the engaging member. The seismic resistant joint structure according to any one of paragraphs 3. 5. The slide stopper rotation preventing means is characterized in that the slide stopper is inserted into a guide frame having a space slightly wider than the width of the slide stopper and extending in the movable direction of the slide stopper. Item 4. A seismic resistant joint structure according to item 4. 6. The seismic resistant joint structure according to claim 4, wherein the slide stopper rotation preventing means includes a bar-shaped guide member penetrating the slide stopper along the movable direction of the slide stopper. 7. A tunnel segment piece using the seismic resistant joint structure according to any one of claims 1 to 6.