JP3240317B2 - Steel segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a steel segment for primary lining of a shield tunnel, and more particularly to a boltless steel segment for connecting segments without using bolts for joints.

[0002]

2. Description of the Related Art For a primary lining of a shield tunnel constructed by a shield method, a steel segment made of only a steel plate and a composite segment obtained by combining a steel plate and concrete are used. FIG. 9 shows a configuration of a shield tunnel using a composite segment, and FIG. 10 is an enlarged view of a part of the composite segment. 9 and 10, reference numeral 1 denotes a shield tunnel, 2 denotes a plurality of segment rings, and 3 denotes a ring-segmented composite segment. 31 and 32 are the piece-to-piece and ring-to-ring joints of segment 3, 31a and 3
2a is a bolt hole for a joint. Reference numeral 4 denotes concrete cast in the composite segment 3.

The piece-to-piece joints 31 are provided on both left and right end surfaces of the segment 3 and sequentially connect a plurality of pieces of the segment 3 with bolts (not shown) passed through bolt holes 31a to form a ring-shaped segment. A ring 2 is formed. In addition, the inter-ring joints 32 are provided on both end surfaces of the segment 3 in the radial direction, and bolts for joints are inserted into the bolt holes 32a. Then, the segment ring 2 formed by the plurality of segments 3 is coaxially connected by the inserted bolts to form the final cylindrical shield tunnel 1.

FIG. 11 is a perspective view showing the structure of a conventional steel segment. In FIG. 11, reference numeral 5 denotes a steel segment. Reference numeral 50 denotes a steel frame, which comprises a joint plate 51, a main girder 52 and a skin plate 53 welded to each other.
A required number of vertical ribs 54 are welded to the inner surface of the steel frame 50 in an inverted J shape. Also in the steel segment 5, bolt holes 51a and 52a for joints are formed in the joint plate 51 in the axial direction and the main girder 52 in the radial direction. Then, the bolt 55 is passed through the bolt holes 51a and 52a (FIG. 12), so that the cylindrical shield tunnel 1 as shown in FIG. 9 can be assembled.

[0005]

Since the conventional steel segment 5 is constructed as described above, there are the following problems. The bolting work in the segment assembling process is complicated, and a relatively long time has been spent on the assembling work involving the screwing of the bolt and the nut. Therefore, the ratio of the time required for the bolting operation to the total operation time is large, which has been an obstacle in shortening the shield installation period. Further, it is difficult to carry out automatic assembly by a machine under the current state, and it has been desired to realize a steel segment having a simple and easily assemblable structure applicable to automation.

[0006] Steel segments are often applied in general to relatively small diameter shield tunnels. For this reason, the tightening of bolts in a small-diameter and narrow tunnel becomes more complicated and difficult, and in this respect, automation of segment assembling work has been strongly demanded.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional apparatus, and it is possible to easily connect segments by pressing them in a certain direction and to use a boltless steel type without bolts. The purpose is to realize a segment.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a mortise projection and a mortise hole at the ends of two main girders in the prior art, and one of the two main girders. The problem was solved by making the cross section of the main girder approximately L-shaped.

According to the steel segment of the present invention, when assembling the segment pieces into the segment ring, the joints between adjacent pieces of the segment pieces are overlapped and pressed in the axial direction. When the adjacent joints are pressed, the mortises and mortises provided in the superposed piece-to-piece joints are fitted, and the two segment pieces arranged close to each other in the circumferential direction are joined. Similarly,
The connection of the plurality of segment pieces arranged one after the other in the circumferential direction makes a complete circle, and an annular segment ring is assembled.

The main girder of one of the two main girders has a substantially L-shaped cross-section and a flange, and the other has a rectangular cross-section. As a result, a structure for restraining shear displacement is obtained. For this reason, even if there is no inter-ring joint, a new ring is assembled while following the flange of the existing segment ring.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a configuration diagram of a shield tunnel to which the first embodiment of the present invention is applied, and FIG. 2 is a perspective view of a steel segment of the first embodiment. In this embodiment, a six-piece steel segment obtained by dividing an annular segment ring into six is illustrated. In FIG. 1, 1 is a shield tunnel, 2 is a segment ring, and O is a tunnel axis. The segment ring 2 is a 6-piece steel segment P1 to
P6 is connected in a ring shape. The structure of, for example, piece P2 or P3 in a six-piece steel segment is shown in FIG.

In FIG. 2, reference numeral 6 denotes a steel segment according to the first embodiment of the present invention. 60 is an ark-shaped steel frame, 61 and 62
Are two beam plates and girder plates provided on both sides of the steel frame 60 in the axial direction and the radial direction, 63 is a skin plate, 64 is a vertical rib, and these constituent members correspond to those in the related art. The sign of a one-digit numerical value is given. The beam plate 61 and the girder plate 62 according to the first embodiment have no bolt holes as in the related art, and the beam plate 61 and the girder plate 62 surround the periphery of the steel frame 60 to form a connection surface. It is not directly involved in binding. In particular, two girder plates 6
2 is made by assembling steel structural members of different steel plates as shown in the figure.

Reference numeral 62a denotes an attachment plate, and reference numerals 62b and 62c denote the girder plates 62, which are shown on the opposite side and the front side of FIG. Previous
A flat steel plate is used for the other girder plate 62b.
Further, the cross plate 62 c on the near side is formed in an L-shaped cross section, and the bent portion 62 d at the L-shaped tip is formed to protrude in a flange shape to the side of the steel frame 60. 62e is the girders 62b and 62c
Is formed at a pair position on the outer surface side of the attachment plates 62a attached to the left and right sides of the two girder plates 62.

At the other end of the two girder plates 62, the protrusions 62 are formed due to the displacement of the girder plates 62b and 62c.
f is projected left and right from the steel frame 60. Projection 62
The contour shape of f and the step portion 62e is formed in a combination structure, and when the two are opposed to each other, the concave portion and the convex portion can be complementarily fitted. Reference numeral 65 denotes two cylindrical tenons provided to project from the left and right step portions 62e, and 66 denotes a projecting portion 62.
These are two tenon holes penetrating through f. The beam plate 61 and the girder plate 62 are welded to form an ark-shaped steel frame 6.
An annular segmented steel segment 6 provided with 0 is formed. Then, as described later, the tenon 65 and the tenon hole 6 are used.
6 are fitted together to form a tenon joint that connects adjacent pieces of the steel segment 6.

In addition, among the six-piece steel segments 6, as shown in FIG.
Indicates that the positions of the mortise 65 and the mortise hole 66 are P2, P3
Are provided symmetrically. Also, pieces P1 and P4
The mortise 65 and the mortise hole 66 are formed on the same girder plate 62 side.

An example of the assembling operation of the shield tunnel 1 of the first embodiment having such a configuration will be described below with reference to FIGS. FIG. 3 is a developed view for explaining the operation of the first embodiment of the present invention, FIG. 4 is a developed view showing a connected state between pieces, and FIG. 5 is a sectional view showing a connected state between rings. In FIGS. 3 to 5, Lb is an existing segment ring at the previous stage, Lp is a segment ring being assembled, and P1 to P6 are pieces of the steel segment 6 as described above. Also,
The hollow arrow A indicates the direction of excavation of the shield machine, and the arrow a indicates the direction in which the steel segment 6 is pressed.

A circular tunnel slightly larger than the shield tunnel 1 is bored in the laying ground by the shield machine. A plurality of pieces P1 to P6 of the steel segment 6 are previously connected to the bored tunnel in a ring shape along the inner wall surface as the shield machine excavates. Then, it is assumed that the existing shield tunnel 1 including a plurality of rings as shown in FIG. 1 is constructed in the tunnel.

As shown in FIG. 1, the construction end of the segment ring Lb at the previous stage of the existing shield tunnel 1
L-shaped girder plate 62 along with the connection of the steel segments 6
A sheath tubular ring L protruding from the bent portion 62d of c is formed. To assemble the shield tunnel 1 composed of the six steel segments 6, the automatic assembling device installed behind the excavator sequentially receives the pieces P1 to P6 carried in by the underground carrier and sequentially receives the pieces P1 to P6. Automatic assembling is performed by such an operation.

First, as shown in the developed view of FIG. 3, the piece P1 of the steel segment 6 is brought into contact with the existing preceding segment ring Lb. At this time, the beam plate 62b is set to the front side, and the front beam plate 62 is
Press along the L-shaped girder plate 62c formed in b.
Next, the piece P6 is carried to the right side of the piece P1, and is positioned and aligned with the tenon 65 and the tenon hole 66 on the right side of the piece P1.
Then, the tenon 65 on the left side of the piece P6 is fitted into the tenon hole 66.

When the mortise 65 and the mortise hole 66 are fitted to each other, a pressing force in the direction of arrow a is applied by a shield jack. Subsequently, the piece P2 is connected to the left side of the piece P1 by using the tenon 65 and the mortise hole 66 on the left side of the piece P1. In a similar operation, pieces P5 and P3 are
6 and P2, and finally, the piece P4 is fitted between P5 and P3 to form a segment ring Lp, which is displaced from the connection between the pieces and connected to the preceding ring Lb.

The pieces P2 and P in the segment ring Lp
An exploded view of the radially coupled state of No. 3 is shown in FIG. As is apparent from the figure, the contours of the concave portion and the convex portion are complementarily eliminated by the stepped portion 62e and the protruding portion 62f in the contact state (see FIG. 2 for 62e and 62f). Also,
FIG. 5 shows an axially connected state of the segment rings L1, L2... Ln. As shown in FIG. 5, a continuous annular flange is formed at the bent portion 62d of the preceding segment ring Lb, and the beam plate 62 of the subsequent segment ring Lp is fitted to this flange.

Then, the segment rings Lp are sequentially intermittently connected in accordance with the excavation stroke of the shield excavator, and the segment rings of the shield tunnel 1 are pointed by arrows A.
In the direction of excavation. In addition, as shown in the development of FIG.
If the piece P4 to be joined inside is trapezoidal, the piece P
There is an advantage that the connection of 4 can be performed smoothly. When the segment piece is assembled, the segment piece is pushed in the direction of the tunnel axis O after the positioning is completed, and the mortise 65 and the mortise hole 66 are formed.
Was possible only by fitting.

Embodiment 2 FIGS. 6A and 6B are sectional views of Embodiment 2 of the present invention.
A mortise 65 and a mortise hole 66 are provided at corresponding positions on the spar plate 62 adjacent to the segment rings L1, L2,. When the steel segment 6 is increased in size and increased in weight, the second embodiment is applied to strengthen the connection of the steel segment 6 in the ring.

Third Embodiment FIG. 7 is an explanatory view of the configuration of a third embodiment of the present invention. FIG.
In 68, a tenon with a cylindrical and axial slit,
69 is a tenon receiver into which the tenon 68 is fitted. The steel segment 6 having the slitted tenon 68 is pressed and fitted to the tenon receiver 69 of the steel segment 6 in the adjacent segment ring Ln to be joined. Tenon 68
Is press-fitted into the tenon receiver 69, the slits are widened and caulked as shown in FIG. According to the third embodiment, the bonding force of the steel segments 6 is further enhanced.

Fourth Embodiment FIG. 8 is an explanatory diagram of a configuration of a fourth embodiment of the present invention. In FIG. 8, 62 g and 62 h are a pair of connecting plates fixed above and below the spar plate 62 on both sides, and 68 and 69 are a tenon and a tenon receiver having the same structure as in the third embodiment. The coupling plates 62g and 62h are welded at the positions indicated by the dotted lines of the respective girder plates 62 at the time of fabrication. One coupling plate 62g is fixed to the inner side with a slight displacement. The coupling plates 62g and 62h that are in contact with each other at the connection surface between the rings are fitted complementarily in the same manner as the relationship between the stepped portion 62e and the protruding portion 62f. In particular, the width of the coupling plate 62h on the lower side (outer peripheral surface side) of the girder plate 62 is made small, and the projecting length is made short.

In the fourth embodiment having such a structure, the steel segment 6 to be connected is moved closer to the adjacent segment 6 in the preceding stage from the state shown in FIG. When the tenon 68 is inserted into the tenon receiver 69 after approaching, the tenon joint is caulked as in FIG. At the same time, the upper and lower surfaces of the preceding girder plate 62 are shifted from each other as shown in FIG.
It fits and is pinched between the protrusions of 2h. Then, a sealing material is interposed in the gap g shown in FIG. According to the fourth embodiment, the restraint against the shear displacement is more reliable, the connection between the segment rings is further remarkably strengthened, and the stability of the strength of the entire structure is improved. In addition, the sealing material interposed in the gap g has an effect of enhancing the water stoppage.

In the above-described embodiment of the present invention, the case of a six-piece segment ring has been described as an example.
The number of pieces of the steel segment, such as eight pieces or ten pieces, can be appropriately increased or decreased. In the first embodiment, two column-shaped tenons and tenon holes are illustrated and described.
Not only the number of tenons, but also a coupling mechanism such as a key-shaped engaging piece that elastically engages with and engages with the square-shaped engaging hole. Further, a stud, a suspension ring, or the like may be provided on the inner surface of the skin plate, and when strength is required, concrete may be cast inside the skin plate. Furthermore, the order of assembling the steel segments is not necessarily limited to the embodiment.

[0028]

According to the present invention, an ark-shaped steel having a tenon projection is provided.
An attachment plate made of a steel plate provided on both sides in the radial direction of the frame ,
Steps equivalent to the plate thickness due to the displacement of the contact plate at one end
Part is formed on the offset surface of the attachment plate , the other end is made to protrude the required length in the radial direction, and a girder plate made of steel plate with a mortise hole corresponding to the mortise The girder plate provided complementarily at the position is constituted, and one of the girder plates is constituted by a flat girder plate, and the other girder plate has a bent portion projecting like a flange to the side of the steel frame substantially in cross section. L
A steel segment composed of a letter-shaped girder was constructed.

According to the present invention, a beam plate and a girder plate forming a connecting surface between pieces and rings are arranged on both sides in the axial direction and the radial direction, and the outer peripheral surface is covered with a skin plate to form a ring. In a steel segment that constitutes a split-type ark-shaped steel frame, a tenon joint that connects the pieces by applying an axial pressing force to the girder plate is provided, and a flange that locks the connecting surface between the rings is formed. A steel segment was constructed. In addition, a steel segment in which the tenon joint is connected by a tenon that fits into the tenon hole is configured. Further, a steel segment in which a tenon joint was provided on the connecting surface between the rings was configured. Further, a steel segment provided with a tenon joint having a tenon with a slit on a connecting surface between the rings was configured.

As a result, according to the present invention, only by pushing the segment in the tunnel axis direction, the tenon and the tenon hole provided at the end of the girder plate are fitted to form a segment ring. Further, since the shear displacement between the segment rings is restrained by the engagement of the substantially L-shaped girder plate and the girder plate having a rectangular cross section, the connection for assembly is smaller than the steel segment of the conventional bolted joint. Fewer components are required. Further, the assembling time and the assembling process are shortened, the shielding work speed is greatly improved, and the assembling work can be saved with a structure that can be easily assembled automatically by a machine.

Thus, according to the present invention, it is possible to provide a bolt-less steel segment which can be easily connected by pressing the segments in a certain direction and does not use bolts.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a shield tunnel to which Embodiment 1 of the present invention has been applied.

FIG. 2 is a perspective view illustrating a configuration of a first exemplary embodiment of the present invention.

FIG. 3 is a developed view showing a connection operation of the segment ring according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing a connection state between pieces according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a connection state between rings according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a connection operation of the segment ring according to the second embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a connection operation of a segment ring according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating a connection operation of a segment ring according to a fourth embodiment of the present invention.

FIG. 9 is a perspective view of a shield tunnel using a conventional composite segment.

FIG. 10 is a perspective view of a part of a conventional synthetic segment.

FIG. 11 is a configuration explanatory view of a conventional steel segment.

FIG. 12 is a partial cross-sectional view showing a connected state of FIG. 11;

[Explanation of symbols]

 Reference Signs List 1 shield tunnel 2 segment ring 6 steel segment 60 steel frame 61 beam plate (joint plate) 62 girder plate (main girder) 62a attachment plate 62b girder plate 62c girder plate 62d bent portion 62e stepped portion 62f projecting portion 62g connecting plate 62h Coupling plate 63 Skin plate 64 Rib 65 Mortise (mortise joint) 66 Mortise hole (mortise joint) A Drilling direction a Pressing direction L Ring Lb Existing (previous stage) segment ring Lp Segment ring during assembly P1 to P6 Segment piece O Tunnel axis

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-105297 (JP, A) JP-A-4-339997 (JP, A) JP-A-5-280293 (JP, A) JP-A-51- 117425 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 11/04 E21D 11/14

Claims (5)

(57) [Claims] 1. An ark-shaped steel frame having a tenon projection in a radial direction
A contact plate made of a steel plate provided on both sides, and a step corresponding to the plate thickness in which the contact plate is welded to one end while being shifted.
A difference portion is formed on the offset surface of the attachment plate, and the other end is protruded by a required length in the radial direction, and a girder plate made of a steel plate provided with a mortise hole corresponding to the mortise projection is attached to the protrusion. Forming a girder plate in which the stepped portions are provided complementarily at the mating positions, and one of the girder plates is formed of a flat girder plate;
A steel segment, characterized in that the other girder plate is constituted by a girder plate having a substantially L-shaped cross section with a bent portion protruding in a flange shape on the side of the steel frame. 2. An annular divided ark in which a beam plate and a girder plate which form a connecting surface between pieces and rings are opposed to each other in both the axial direction and the radial direction, and the outer peripheral surface is covered with a skin plate. In a steel segment constituting a steel frame of a shape, a mortise joint for connecting the pieces by applying an axial pressing force to the girder plate is provided, and a flange for locking a connection surface between the rings is formed. Characterized by a steel segment. 3. The steel segment according to claim 2, wherein said tenon joint is connected by a tenon fitted into a tenon hole. 4. The steel segment according to claim 2, wherein a tenon joint is provided on a connecting surface between the rings. 5. The steel segment according to claim 2, wherein a tenon joint having a tenon with a slit is provided on a connecting surface between the rings.