JPH09158691A - Steel segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the assembling work by providing a tenon projection at one end of one girder plate of a segment, providing a mortice at the other end thereof to connect pieces to each other, and connecting rings to each other by a flange provided on the other L-shaped girder plate. SOLUTION: A piece P2 of a steel segment 6 has a girder plate 62b on this side, and a front girder plate 62 is laid along an L-shaped girder plate 62c of an existing segment ring and pressed thereto. Subsequently, two cylindrical tenons 65 provided on the left stepped part 62e of a piece P3 aligned on the right side of the piece P2 and two mortices 66 pierced in the projected part 62f are fitted to the right tenon 65 and the mortice 66 of the piece P2 and pressing force is applied thereto by a shield jack. Thus, the assembling time and the process can remarkably be shortened and improved the shield execution speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention 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 the primary lining of shield tunnels constructed by the shield construction method, steel segments made only of steel plates and synthetic segments made of steel plates and concrete are used. The construction of the shield tunnel using the composite segment is described in FIG. 9, and an enlarged view of a part of the composite segment is shown in FIG. In FIGS. 9 and 10, 1 is a shield tunnel, 2 is a plurality of segment rings, and 3 is an annular equally divided composite segment. 31 and 32 are the piece-to-piece joints and ring-to-ring joints of segment 3, 31a and 3
2a is a bolt hole for a joint. Further, 4 is 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 a plurality of pieces of the segment 3 are sequentially connected by bolts (not shown) passed through the bolt holes 31a to form a ring-shaped segment. Ring 2 is formed. The inter-ring joint 32 is provided on both end surfaces of the segment 3 in the radial direction, and the joint bolt is inserted into the bolt hole 32a. Then, the final cylindrical shield tunnel 1 is constructed by coaxially connecting the segment rings 2 formed of the plurality of segments 3 with the inserted bolts.

FIG. 11 is a perspective view showing the structure of a conventional steel segment. In FIG. 11, 5 is a steel segment. A steel frame 50 is composed of a joint plate 51, a main girder 52 and a skin plate 53 which are welded to each other.
Further, the required number of vertical ribs 54 having an inverted J shape are welded to the inner surface of the steel frame 50. In the steel segment 5 as well, the joint plate 51 in the axial direction and the main girder 52 in the radial direction are provided with joint bolt holes 51a and 52a. Then, the bolt 55 is passed through the bolt holes 51a and 52a (FIG. 12) to assemble the cylindrical shield tunnel 1 as shown in FIG.

[0005]

Since the conventional steel segment 5 is constructed as described above, it has the following problems. The bolt tightening work in the assembly process of the segment is complicated, and moreover, a relatively long time is spent on the assembling work involving screwing of the bolts and nuts. Therefore, the ratio of the time required for bolting work to the total work time is large, which is an obstacle to shortening the shield construction period. Further, it is difficult to carry out automatic assembly by a machine under the current circumstances, and it has been desired to realize a steel segment having a structure that can be easily and easily assembled so that it can be applied to automation.

Steel segments are often applied to shield tunnels of generally smaller diameter. For this reason, tightening bolts in a small-diameter and narrow tunnel becomes more complicated and difficult work, and from this point also, there is a strong demand for automation of segment assembly work.

The present invention has been made in order to solve the above-mentioned problems of the conventional apparatus. It is made of steel of a boltless joint type which does not use bolts and can be easily joined by pressing the segments in a certain direction. It is intended to realize segments.

[0008]

In order to achieve the above object, the present invention is provided with a tenon projection and a tenon hole at the ends of two main girders in the prior art, and one of the two main girders is provided. The problem was solved by making the cross section of the main girder substantially L-shaped.

According to the steel segment of the present invention, when the segment pieces are assembled into the segment ring, the adjacent piece-to-piece joint portions of the segment pieces are overlapped and pressed in the axial direction. When the adjacent joint portions are pressed, the mortises and the mortise holes provided in the overlapped inter-piece joint portions are fitted to each other, and the two segment pieces arranged close to each other in the circumferential direction are joined. Similarly,
An annular segment ring is assembled by joining together a plurality of segment pieces arranged one after another in the circumferential direction.

Of the two main girders, one main girder has a substantially L-shaped cross section and is provided with a flange, and the other has a rectangular cross section, so that the main girders are fitted in a cage shape between the segment rings. Then, it becomes a structure that restrains shear displacement. For this reason, the new ring can be assembled while following the flange of the existing segment ring even without the ring-to-ring joint.

[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 six-piece steel segment P1 ~
It is constructed by connecting P6 in a ring shape. The structure of a piece P2 or P3, for example, in a 6-piece steel segment is shown in FIG.

In FIG. 2, 6 is a steel segment of Embodiment 1 of the present invention. 60 is a ark-shaped steel frame, 61 and 62
Are two beam plates and two girder plates provided on both sides in the axial direction and the radial direction of the steel frame 60, 63 is a skin plate, and 64 is a vertical rib. The reference numeral is attached. Beam plate 6 of Embodiment 1
1 and the girder plate 62 do not have the bolt holes as in the past,
The beam plate 61 surrounds the periphery of the steel frame 60 together with the girder plate 62 to form a connecting surface, but does not directly participate in the connection between the pieces. In particular, the two girder plates 62 are made by assembling mutually different steel structural members as shown.

Reference numeral 62a is a splicing plate, and 62b and 62c are spar plates which form a spar plate 62 shown on the opposite side and the front side of FIG. The front side girder plate 62c is formed to have an L-shaped cross section, and a bent portion 62d at the L-shaped tip is projected to the side of the steel frame 60 in a flange shape. Reference numeral 62e denotes a step portion corresponding to the plate thickness of the girder plates 62b and 62c, which is formed at a pair position on the outer surface side of the abutting plates 62a abutting on the left and right of the two girder plates 62.

On the other end side of the two girder plates 62, the projecting portion 62 is formed due to the displacement of the girder plates 62b and 62c.
f is projected from the steel frame 60 to the left and right. Protrusion 62
The contour shape of the f and the stepped portion 62e is combined so that the concave portion and the convex portion can be complementarily fitted to each other when they are contacted with each other. Reference numeral 65 designates two cylindrical mortises projectingly provided on the left and right step portions 62e, and 66 designates the projecting portion 62e.
It is two mortise holes penetrating in f. The beam plate 61 and the girder plate 62 are welded to each other to form a ark-shaped steel frame 6
An annular split steel segment 6 having 0 is constructed. Then, as will be described later, the tenon 65 and the tenon 6
6 are fitted to each other to form a Hoso joint for connecting between adjacent pieces of the steel segment 6.

In addition, among the 6-piece steel segments 6, as shown in FIG. 1, P5 and P6 steel segments 6 are used.
The positions of the mortise 65 and the mortise hole 66 are P2 and P3 described above.
It is installed symmetrically. Also, pieces P1 and P4
Has a mortise 65 and a mortise hole 66 formed on the same girder plate 62 side.

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

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

At the construction end of the segment ring Lb in the previous stage of the existing shield tunnel 1, as shown in FIG.
L-shaped girder plate 62 accompanying the connection of the individual steel segments 6
A sheathed tubular ring L is formed by the bent portion 62d of c. When assembling the shield tunnel 1 composed of six steel segments 6, the automatic assembling device installed behind the excavator sequentially receives the pieces P1 to P6 carried by the underground trolley and then Automatic assembly 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 that time, with the girder plate 62b on the front side, the front girder plate 62 is placed on the front segment ring L.
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 aligned and aligned with the hook 65 and the hook hole 66 on the right side of the piece P1.
Then, the left side mortise 65 of the piece P6 is fitted into the mortise hole 66.

A pressing force in the direction of arrow a is applied by the shield jack to the mutual fitting of the groove 65 and the hole 66. Then, the piece P2 is joined to the left side of the piece P1 by utilizing the left-side hook 65 and the left-side hole 66 of the piece P1. 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 segment ring Lp, which shifts the connecting portion between the respective pieces and is connected to the ring Lb in the preceding stage.

Pieces P2 and P in the segment ring Lp
A developed view of the radial connection state of 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 step portion 62e and the protruding portion 62f in the contact state (see FIG. 2 for 62e and 62f). Also,
FIG. 5 shows the 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 front segment ring Lb, and the girder plate 62 of the rear segment ring Lp is fitted to this flange.

Then, the segment rings Lp are sequentially and intermittently connected corresponding to the excavation stroke of the shield machine, and the segment ring of the shield tunnel 1 is indicated by an arrow A.
Will be extended in the direction of excavation. As shown in the development view of FIG. 3, finally, the segment ring Lp
If the piece P4 that is connected inside is trapezoidal,
There is an advantage that the connection of 4 can be smoothly performed. In addition, when the segment piece is assembled, the segment piece is pushed in the direction of the tunnel axis O after positioning is completed, and
It was possible only by fitting.

Embodiment 2 FIGS. 6 (a) and 6 (b) are sectional views of Embodiment 2 of the present invention.
A mortar 65 and a mortar hole 66 are provided at the corresponding positions of the adjacent girder plates 62 of the segment rings L1, L2 ... Ln. When the steel segment 6 becomes larger and heavier, the second embodiment is applied to strengthen the connection of the steel segment 6 in the ring.

Embodiment 3 FIG. 7 is an explanatory diagram of the configuration of Embodiment 3 of the present invention. FIG.
In, 68 is a cylindrical worm with axial slit,
Reference numeral 69 is a mortar holder to which the mortise 68 is fitted. The steel segment 6 having the slit-provided groove 68 is press-fitted and fitted to the groove receiver 69 of the steel segment 6 in the adjacent segment ring Ln. Hozo 68
When is pressed and is press-fitted into the hollow receiver 69, the slits are widened and crimped as shown in FIG. According to the third embodiment, the binding force of the steel segment 6 is further enhanced.

Embodiment 4 FIG. 8 is an explanatory diagram of the configuration of Embodiment 4 of the present invention. In FIG. 8, reference numerals 62g and 62h denote a pair of connecting plates fixed to the upper and lower sides of the girder plates 62 on both sides, and 68 and 69 denote a mortar and a mortar receiver having the same structure as that of the third embodiment. The connecting plates 62g and 62h are welded at the position of the dotted line of each girder plate 62 during the manufacturing process. One coupling plate 62g is fixed to the inside by slightly shifting it. The coupling plates 62g and 62h facing each other at the coupling surface between the rings are complementarily fitted to each other in the same manner as the relationship between the stepped portion 62e and the protruding portion 62f. In particular, the width of the connecting plate 62h on the lower side (outer peripheral surface side) of the girder plate 62 is made small and the projecting length is short.

In the fourth embodiment having such a structure, the steel segments 6 to be connected are brought close to the adjacent adjacent segments 6 from the state shown in FIG. After the approach, when the hook 68 is inserted into the hook receiver 69, the hook joint is crimped as in FIG. At the same time, the upper and lower surfaces of the front girder plate 62 are displaced as shown in FIG.
It will be fitted and sandwiched between the protrusions of 2 h. Then, a sealing material is interposed in the gap g shown in FIG. According to the fourth embodiment, the restraint against the shear displacement becomes more reliable, the coupling between the segment rings is further significantly strengthened, and the stability of the strength of the entire structure is improved. In addition, the sealing material provided in the gap g also has the effect of enhancing the waterproofness.

In the above-described embodiment of the present invention, the case of the 6-piece type segment ring has been described as an example.
The number of pieces of the steel segment such as 8 pieces and 10 pieces can be appropriately increased or decreased. In addition, in the first embodiment, two column-shaped mortises and mortise holes are illustrated and described, but
Of course, the number of the hooks may be a coupling mechanism such as a key-shaped engaging piece that elastically engages and locks the square-shaped engaging hole. In addition, studs, suspension rings, etc. may be provided on the inner surface of the skin plate, and concrete may be placed inside when strength is required. Furthermore, the order of assembling the steel segments is not necessarily limited to the embodiment.

[0028]

According to the present invention, one girder plate is welded at one end with an attachment plate provided with a tenon projection, and the other end is protruded by a necessary length to form a tenon hole, and the other girder plate is provided with a flange. The steel segment has a substantially L-shaped cross section.

Further, according to the present invention, a beam plate and a girder plate, which respectively form a connecting surface 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 with a skin plate. In a steel segment that constitutes a split-type ark-shaped steel frame, a girder plate is provided with a hozo joint that connects the pieces by applying axial pressing force, and a flange that locks the connecting surface between the rings is formed. A steel segment was made. In addition, a steel segment was constructed in which the mortise joint was connected by a mortise that fits into the mortise hole. In addition, a steel segment having a Hoso joint on the connecting surface between the rings was constructed. Further, a steel segment is provided in which a tenon joint having a tenon with a slit is provided on the connecting surface between the rings.

As a result, according to the present invention, the segment ring is formed by simply pressing the segment in the tunnel axial direction to fit the mortise and the mortise hole provided at the end of the girder plate. 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 with a rectangular cross section, the connection for assembling is made compared with the steel segment of the conventional bolt-fastened joint. Only a small number of parts 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 boltless joint type steel segment which does not use bolts, because the segments can be pressed together in a fixed direction and easily joined together.

[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 a perspective view showing the configuration of the first embodiment of the present invention.

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

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

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

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

FIG. 7 is a sectional view showing a connecting operation of the segment ring according to the third embodiment of the present invention.

FIG. 8 is a sectional view showing a connecting operation of the segment ring according to the 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 part of a conventional composite segment.

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

FIG. 12 is a partial cross-sectional view showing a combined state of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 shield tunnel 2 segment ring 6 steel segment 60 steel frame 61 beam plate (joint plate) 62 girder plate (main girder) 62a splicing plate 62b girder plate 62c girder plate 62d bent part 62e step part 62f protruding part 62g coupling plate 62h Bonding plate 63 Skin plate 64 Rib 65 Hoso (Hoso joint) 66 Hoso hole (Hoso joint) A Excavation direction a Pressurizing direction L ring Lb Existing (previous stage) segment ring Lp Segment ring being assembled P1 to P6 Segment piece O Tunnel axis

Claims (5)

[Claims] 1. An approximately L-shaped cross-section having an attachment plate having a tenon protrusion provided on one end of one girder plate and welding the other end to project a necessary length to form a tenon hole, and the other girder plate having a flange. Steel segment characterized by being formed into a shape. 2. A ring-split type ark, in which beam plates and girder plates, which respectively form a connecting surface between the pieces and between the rings, are arranged opposite 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, a gutter plate is provided with a hozo joint for connecting pieces by applying an axial pressing force, and a flange for locking a connecting surface between the rings is formed. Steel segment characterized by. 3. The steel segment according to claim 2, wherein the mortise joint is connected by a mortise that fits in a mortise hole. 4. The steel segment according to claim 2, wherein a hozo joint is provided on a connecting surface between the rings. 5. The steel segment according to claim 2, wherein a hozo joint having a slit with a groove is provided on a connecting surface between the rings.