JPH09105297A - Synthetic segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the assembling property by providing a step section, a pin, and a tenon to be coupled with the adjacent segment on the girder member of the ark-like steel frame of a circular split type synthetic segment, and pressing the segment in the axial direction to connect it. SOLUTION: A step section 42a, a projection 42b, a pin 42c, a pin hole 42d, a tenon 42e, and a tenon groove are provided on the longitudinal girder member 42 of a synthetic segment 4 placed with concrete 5 on an ark-like steel frame 40, and they are integrally formed by casting. The synthetic segments 4 are connected together into a ring shape, and they are connected in the axial direction for the primary lining of a shield tunnel. The projection 42b of the adjacent segment is coupled with the step section 42a, the tenon 42e and the pin 42f are coupled with the tenon groove and the pin hole 42d of the adjacent segment, and the segments are pressed in the axial direction by a seal jack and connected. A connecting bolt and a bolt box extraction section are not required, and shearing force and bending strength is improved. Assembling efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite segment used for the primary lining of a shield tunnel, which is a composite of steel frame and concrete.

[0002]

2. Description of the Related Art As a synthetic segment of this type, for example, an apparatus described in Japanese Patent Laid-Open No. 3-286097 is known. FIG. 8 is a perspective view showing the structure of the composite segment described in JP-A-3-286097, and FIG. 9 is a sectional view of the steel material portion of FIG. 8 and 9, reference numeral 101 is a composite segment, 102 is a steel plate on the ground side, 103 is a steel plate on the inner side, 104, 104 'are side steel plates, and 105 is concrete. Also, 106 is an inter-segment joint box,
107 is an inter-ring joint box, 108 is a grout injection hole, 109 is a concrete pouring hole, and 110 is a stud. As shown, the inter-segment joint box 106
A bolt hole is provided in the ring-to-ring joint box 107, and a bolt is passed through this bolt hole to connect between the segments and between the rings.

The composite segment 101 shown in FIGS. 8 and 9 includes a steel plate 102 on the ground side, a steel plate 103 on the inner side of the sky, and a side plate 104,
104 ', and joint boxes 106 and 107 between the segments and between the rings are formed at predetermined positions of these steel plates 102 and the like. In addition, the stud 110 is attached to the steel plates 102, 10
Provide tightly inside 3. Then, the concrete 105 is formed inside the portion surrounded by the steel plate 102 through the concrete placing hole 109 to form the portion of the concrete 105.

[0004]

The conventional composite segment 101 shown in FIGS. 8 and 9 has relatively high strength and rigidity of the segment body, but has the following problems. In order to fasten the segment 101 or the like, the bolts in the joint boxes 106 and 107 are forced to be offset inside the shield tunnel. Further, if the bolt diameter is increased or the number of bolts is increased in order to increase the strength of the joint portion, the cross-section missing portion of the segment body due to the joint boxes 106 and 107 becomes larger accordingly, which causes the strength reduction of the segment body and the joint portion. It was In the segment assembling work, the bolt fastening work is complicated, and it is difficult to apply the automatic assembling by the machine as it is. Therefore, it has been desired to realize a simple coupling method of the composite segment 101 suitable for automation.

The present invention has been made in order to solve the above-mentioned conventional problems, and is provided with a high-strength joint which does not use bolts, and is a simple operation of the excavating jack and the assembling apparatus, and in a short time. The object is to realize a composite segment in which segment pieces can be assembled and joined together.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a cross section of a member, which is formed by casting or the like, as a girder member corresponding to a side surface steel plate in the prior art, and is preliminarily processed with a shear groove or a seal groove. The problem was solved by providing a hook joint and a pin joint that allow the pieces to fit together.

According to the composite segment of the present invention, an arc-shaped girder member corresponding to a conventional girder plate is provided continuously with the outer periphery of the connecting surface between the rings by using a special shape steel which has been subjected to a HOZO process by casting or the like. The segments are fixed to each other by fitting the pin and the pin hole and engaging the hook and the hole. With such a configuration of the present invention, the inter-ring joint box of the conventional device can be eliminated. Complementary steps and protrusions having pins and pin holes were provided at the ends of the girder members, and the segment pieces were axially pressed to fit the pins into the pin holes to join the pieces together. With such a configuration of the present invention, the inter-segment joint box of the conventional device can be eliminated. In addition, bending in different directions between the pieces (positive bending: the hollow side in the tunnel is in tension, negative bending: the ground side of the tunnel is in tension)
It resists evenly and with sufficient strength.

By arranging the joint portion including the shear hook, the inter-ring pin, and the inter-piece pin type joint only on the inter-ring joint surface side, the composite segment can be assembled only by pressing in the axial direction of the shield tunnel. It will be possible.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. 1 is a configuration diagram of a shield tunnel to which the first embodiment of the present invention is applied, FIG. 2 is an enlarged perspective view showing the configuration of the first embodiment, FIG. 3 is a perspective view near the right end portion of FIG. 2, and FIG. It is a perspective view near the left end. In this embodiment,
A 6-piece type composite segment obtained by dividing an annular shield ring into 6 parts is illustrated.

In FIG. 1, 1 is a shield tunnel, 2
Is a shield ring and 3 is a tunnel axis. The shield ring 2 is constructed by connecting six pieces of composite segments P1 to P6 in a ring shape. An enlarged structure of, for example, the piece P2 or P3 in the six-piece composite segment P1 to P6 is shown in FIG.

In FIG. 2, 4 is a composite segment. Reference numeral 40 is a ark-shaped steel frame, 41 and 42 are two beam members and girder members provided on both sides in the axial direction and the radial direction of the steel frame 40, and 43 and 44 are inner and outer flanges (see FIG. 7),
45 is a skin plate. The beam member 41 and the girder member 42 of the embodiment of the present invention also surround the periphery of the steel frame 40 to form a connecting surface between the pieces and the rings, as in the conventional case. A plate member is used for the beam member 41 forming the connecting surface between the pieces,
A seal groove 41a is formed on the outer side surface.

On the other hand, the double girder members 42 constituting the connecting surface between the rings are made of a special shape steel having a special shape formed by casting or the like. 42a is a stepped portion formed at one end of the girder member 42, 42b is a protruding portion protruding toward the other end,
c is two cylindrical pins provided on the step portion 42a, 4
2d corresponds to the pin 42c which is provided through the protruding portion 42b.
Three pin holes. The stepped portion 42a and the protruding portion 42b are formed in a combined structure, and when both are contacted with each other, the concave portion and the convex portion are complementarily eliminated.

Reference numeral 42e designates an outer surface of the girder member 42 which has a trapezoidal cross section which is raised in a jetty shape along an arc.
e is a plurality of pins protruding above, and 42g is a seal groove. Although not shown, the outer side surface of the girder member 42 on the opposite side of FIG.
A groove 40h corresponding to 2g, a pin hole 42i, and a seal groove j are provided. Then, as will be described later, the pin 42c of the step portion 42a and the pin hole 42d constitute a pin joint for connecting the adjacent pieces, and the pin 42f and the mortise 42e on the outer surface are fitted in the pin hole 42i and the mortise groove 42h. A pin joint and a HOSO joint that are combined to connect between adjacent rings are configured.

In addition, of the 6-piece composite segment 4, as shown in FIG. 1, the composite segment 4 of P5 and P6.
The position of the pin 42c and the pin hole 42d is P2,
It is provided symmetrically with P3. Also, pieces P1 and P4
Has a pin 42c and a pin hole 42d formed on the same girder member 42 side. Reference numeral 5 is concrete cast inside the composite segment 4, and 6 is an elastic seal material interposed in the seal grooves 41a and 42j.

Then, the flange members 43 and 44 are welded to the girder member 42 and the beam member 41 to form a square frame made of steel having a U-shaped cross section. A skin plate 45 is welded to the outer peripheral surface (ground side) of the formed square frame to form a steel frame 40 of which one side is open in an annular split type, and inside the formed ark-shaped steel frame 40. Concrete 5 is poured.

An example of the assembling operation of the first embodiment having such a structure will be described below with reference to FIGS. FIG. 5 is a development view for explaining the operation of the first embodiment of the present invention, FIG. 6 is a sectional view showing a connected state between rings, and FIG. 7 is a sectional view showing a connected state between pieces. 5 to 7, L
b1 and Lb2 are the existing pre-stage and the pre-stage shield ring, Lp
Is a shield ring being assembled, and P1 to P6 are respective pieces of the composite segment 4 as described above. Further, the hollow arrow A indicates the excavation direction of the shield machine, and the arrow a indicates the pressing direction of the composite segment 4.

The shield machine excavates a circular tunnel slightly larger than the outer diameter of the shield tunnel 1 in the laid ground. As the shield machine advances, a plurality of pieces of the composite segment 4 are sequentially coupled in a ring shape along the inner wall surface of the tunnel thus drilled. Here, it is assumed that an existing shield tunnel 1 having a primary lining as shown in FIG. 1 has been previously constructed in the tunnel.

At the construction end of the shield ring Lb2 in the preceding stage of the existing shield tunnel 1, as shown in FIG. 1, a ring groove is continuously formed with a groove 40h as the six pieces P1 to P6 are connected. It is formed. A plurality of pin holes 42i are formed at intervals on the ring formed with the groove 40h. To assemble the shield tunnel 1 composed of six composite segments 4, the automatic assembling device installed behind the excavator sequentially receives the pieces P1 to P6 carried in by the underground trolley and carries out the following. Ring Lp
Is automatically assembled.

First, as shown in the development view of FIG. 5, the piece P1 of the composite segment 4 is brought into contact with the existing shield ring Lb2 at the previous stage. At that time, the gutter member 42 provided with the hos 42e and the pin 42f is turned to the side facing the composite segment 4 in the shield ring Lb2 of the previous stage and pressed. Further, the seal material 6 is interposed between the seal groove 42j of the front girder member 42 and the seal groove 42g of the front shield ring Lb2.

Next, a piece P6 is provided on the right side of the piece P1.
Is carried and aligned to the pin 42 on the right side of the piece P1.
c and the pin hole 42d are fitted to the pin hole 42d and the pin 42c on the left side of the piece P6. At the same time, the ring-shaped joint formed by the pin 42f and the groove 42e on the other side of the piece P6 is coupled, and at this time, the sealing material 6 is also inserted in the sealing groove 42g as described above.

For mutual fitting of the pin joints composed of the pins 42c, 42f, etc., a pressing force in the direction of arrow a is applied by the shield jack. Subsequently, the piece P2 is joined to the left side of the piece P1 by utilizing the pin joint between the pieces P1 and between the rings and the ring joint provided with the groove 42e. In the same operation, pieces P5 and P3 are respectively P
6 and P2, and finally the piece P4 is fitted between P5 and P3 to form a shield ring Lp, which shifts the connecting portion between the respective pieces and is connected to the preceding ring Lb.

Shield ring Lb2 and shield ring Lp
FIG. 6 is a cross-sectional view of the coupling state of the ring joint of FIG. In addition, the cross-sectional view of FIG. 7 shows the connected state of the inter-piece joints in the shield ring. As shown in FIG. 6, the front groove 42e of the shield ring Lb2 has the rear groove 4
The sealing material 6 is inserted inside the seal groove 42g, which is fitted in 2h and is continuously formed in the front and rear stages, while holding an elastic expansion force. Further, the sealing material 6 is also provided in the seal groove 42j on the connecting surface between the pieces in FIG.

Thus, the entire periphery of each composite segment 4 constituting the shield tunnel 1 is sealed with the sealing material 6 so that the waterproofness such as water leakage that enters the inside of the tunnel is secured. Then, the shield rings Lp are sequentially and intermittently connected corresponding to the excavation stroke, and the primary lining of the shield tunnel 1 is extended in the excavation direction indicated by the arrow A. As shown in the developed view of FIG. 5, if the piece P4 finally joined between the rings is made trapezoidal, there is an advantage that the joining between the pieces can be made smooth.

In the above embodiment, the case of the 6-piece type shield ring has been described as an example, but the number of pieces such as 8 pieces and 10 pieces can be appropriately increased or decreased. Also, the case where the piece-to-piece joint has two pins and pin holes has been described, but the number of pins is not limited to two.
2 shows the case where the pin for the ring joint and the mortise are formed on the front girder member, but a pin hole and a mortar hole are formed on the outer peripheral surface of the front girder member to form an inverted structure. You may do it. Furthermore, the structure may be such that studs, reinforcing bars, etc. are arranged inside the closed type steel frame, and the assembly order of the synthetic segments is not necessarily limited to the embodiment.

[0025]

According to the present invention, the beam member and the girder member, which respectively form the connecting surfaces between the pieces and between the rings, are arranged so as to face each other in both the axial direction and the radial direction, and the outer peripheral surface is covered by the skin plate. In a composite segment in which a split ark-shaped steel frame is constructed and concrete is placed inside, a composite is provided with pin joints that connect the connecting surfaces between the pieces and rings by the pressing force applied to the girder member in the axial direction. Configured the segment. Further, a composite segment is provided in which a pin joint for connecting the pieces is provided on a complementary step portion formed at an end portion of the girder member between the adjacent pieces and a protruding portion. Further, a composite segment is provided in which a pin joint for connecting the rings is provided on the outer surface of the girder member between the adjacent rings. In addition, a composite segment was constructed using a pin joint that connects the rings together with a Hoso joint. Further, a composite material is formed by providing a seal material on the outer surfaces of the beam member and the girder member to provide a seal groove for sealing the connecting surface between the pieces and the rings. Further, a flange was fixed to the inside and outside of the beam member and the girder member to form a U-shaped composite segment.

As a result, the effects obtained by the present invention are as follows:
It is as follows. The non-bolt type connection structure is achieved by transmitting the shearing force by the meshing of the shearing groove and transmitting the bending moment by the upper and lower two-stage pin type joints at the ends of the main girder plate that fit together. Since the box removal part is unnecessary, the strength of the segment body and joint part is improved.

By arranging the joint portion composed of the shear hook and the pin joint on the main girder plate side,
The segment can be assembled simply by pushing the segment in the tunnel axis direction, which greatly improves the assemblability. By making the main girder plate of the steel frame a special shape steel by casting or the like, it is not necessary to perform sealing groove processing and mortar processing, and bending of steel material is also unnecessary.

Therefore, according to the present invention, there is provided a composite segment which is provided with a high-strength joint which does not use a bolt, and which enables the segment pieces to be joined by a simple operation of an assembling device such as a jack for excavation. be able to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a shield tunnel to which a first embodiment of the present invention is applied.

FIG. 2 is an enlarged perspective view showing the configuration of the first embodiment of the present invention.

FIG. 3 is a perspective view near the right end portion of FIG.

FIG. 4 is a perspective view near the left end of FIG.

FIG. 5 is a development view showing an example of a segment assembly process of the present invention.

FIG. 6 is a cross-sectional view showing a connected state between the rings according to the first embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a connected state between pieces according to the first embodiment of the present invention.

FIG. 8 is a perspective view showing a configuration of a conventional composite segment.

9 is a cross-sectional view of the steel material portion of FIG.

[Explanation of symbols]

 4 Synthetic segment 5 Concrete 6 Sealing material. 40 Steel Frame 41 Beam Member 41a Seal Groove 42 Girder Member 42a Step 42b Projection 42c Pin 42d Pin Hole 42e Hoso 42f Pin 42g Seal Groove 42h Hoso Groove 42i Pin Hole 42j Seal Groove 43 Inner Flange 44 Outer Flange 45 Skin Plate P1 ~ P6 composite segment piece

Claims (6)

[Claims] 1. A ring-splitting type ark in which beam members and girder members, which respectively form connecting surfaces between pieces and rings, are arranged opposite to each other on both sides in the axial direction and the radial direction, and outer peripheral surfaces are covered with skin plates. In a composite segment in which a concrete steel frame is formed and concrete is placed inside, a pin joint that connects the connecting surfaces between the pieces and the ring by the pressing force applied to the girder member in the axial direction is provided. Is a composite segment. 2. The pin joint for connecting the pieces is provided at a complementary stepped portion and a protruding portion formed at an end portion of the girder member between adjacent pieces. Composite segment. 3. The composite segment according to claim 1, wherein a pin joint for coupling between the rings is provided on an outer surface of the girder member between adjacent rings. 4. The composite segment according to claim 3, wherein a hozo joint is used together with the pin joint for connecting the rings. 5. A seal groove is provided on an outer surface of the beam member and the girder member to seal a connecting surface between the pieces and the ring, and a seal groove is provided. The synthetic segment according to any one of 1. 6. The composite segment according to claim 1, wherein flanges are fixed inside and outside of the beam member and the girder member to form a U-shape.