JP3310389B2 - Segment for tunnel lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel lining segment formed by connecting a large number of tunnel walls.

[0002]

2. Description of the Related Art In recent tunnel construction methods, a so-called shield construction method is generally used in which a cylindrical tunnel wall is constructed by sequentially installing arc-shaped segments behind the ground while excavating the ground with a shield machine. It is becoming more and more. Segments are broadly classified into concrete and steel segments.However, the shield machine is propelled when the type of segment is changed depending on how the propulsion is performed because jacks are propelled by reacting to the ring of the existing segment. There is. For example, in the case of a sharp curve, the shield machine is propelled while turning while applying a reaction force only to the outer segment of the curve, so a compressive force acts on the outside and a tensile force acts on the inside due to the reaction . Since concrete is generally strong against compression and weak against tension, concrete segments are installed on the outside, and tensile-resistant steel is installed on the inside.

[0003] Incidentally, concrete segments are cast in concrete by arranging a reinforcing bar in a formwork, and steel segments are welded by welding a pair of main girders and end plates made of steel plates. By welding the arc plate-shaped skin plate to the outer peripheral surface side,
Each is manufactured. In general, joints between segments are bolted together with joint fittings provided on the joint surface in the case of concrete segments, and with the main girder and end plates in the case of steel segments. Is

[0004]

Incidentally, the steeper the curve, the smaller the width of the segment (ring) must be, and if necessary, the junction end face in the longitudinal direction of the tunnel may be set at an angle. However, the production of such special segments from concrete requires renewal from the formwork, which is laborious, costly and inefficient. In this regard, in the case of steel segments, it is only necessary to assemble steel plates and integrate them by welding, so although it is more advantageous in manufacturing than concrete, it is not enough joint strength with ordinary bolt connection. In addition, after installation, there is an inefficiency in construction such that a secondary lining for filling the inside on the inner peripheral surface side with concrete is required.

The present invention has been made in view of the above circumstances, and has both advantages of concrete and steel, and is particularly suitable for a sharp curve and a tunnel having sufficient joint strength. It is intended to provide a lining segment.

[0006]

SUMMARY OF THE INVENTION A tunnel lining segment according to the present invention has been made to achieve the above object, and in claim 1, a pair of steel main girders extending in an arc shape are connected to each other. It is arranged in parallel opposite, and both ends are
An arc plate-shaped frame body is assembled by being connected by a pair of steel end plates facing each other in parallel with each other, and the main girder and the end plate are provided with through holes for connecting bolts in the longitudinal direction thereof. In the tunnel lining segment, which is formed plurally and concrete is cast inside the frame,
A reinforcing girder extending in the longitudinal direction over the entire length of the main girder and the end plate is fixed to an inner surface of the main girder and the end plate at least at a position close to the insertion hole. A joint recess communicating with the hole is formed,
The reinforcing girder is located above and below the insertion hole.
And the joint bolt is inserted into the insertion hole.
When inserted and fixed, the joint bolt heads
Of the pair of reinforcing girders so as to abut the ends of the reinforcing girders.
It is characterized in that a separation distance is set .

According to a second aspect of the present invention, in addition to the reinforcing girder, a reinforcing mesh is stretched inside the frame body while being fixed to the main girder and the end plate.

[0008]

According to the segment for tunnel lining of the present invention,
It consists of a steel main girder with a reinforcing girder fixed to the inner surface over the entire length in the longitudinal direction, and an end plate.Furthermore, concrete is cast inside a frame body with a reinforced mesh. Combines the advantages of both steel and steel, i.e. compression is concrete and tension is received by steel and reinforced mesh to provide sufficient strength for both forces, thus making it particularly suitable for sharply curved sections of tunnels It is. In addition, since the reinforcing girder is close to the insertion hole of the joint bolt, the reinforcing girder receives the coupling force of the joint bolt, and concrete exists between the main girder and the end plate and the joint recess. Accordingly, the joint strength between the segments is improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a segment 10 according to an embodiment of the present invention. In this segment 10, a pair of steel main girders 11 extending in an arc shape are arranged to face each other in parallel with each other, and both ends of these main girders 11 are opposed to each other in parallel with each other. The frames 13 are connected to each other at 12 to form an arc-shaped frame 13, and concrete 14 is cast inside the frame 13.
(Note that FIGS. 1 and 2 show a state before the concrete 14 is cast.) The segment 10 has a plurality of connected convex surfaces having an outer surface and a concave surface formed as an inner surface to form a tunnel wall. The main girder 11 and the end plate 12 are formed with a plurality of insertion holes 11a and 12a for the joint bolt B at intervals in the longitudinal direction. These insertion holes 11a and 12a are
The segment 10 is located slightly inside from the center in the thickness direction.

In the segment 10, first, a reinforcing girder 15 is provided on the inner surface of the main girder 11 near the insertion hole 11a over the entire length thereof.
The reinforcing girder 15 extends in a state in which the width direction coincides with the width direction of the segment 10 and extends along the longitudinal direction of the main girder 11, and is fixed to the inner surfaces of the main girder 11 and the end plate 12 by welding. I have.

On the other hand, the inner surface of the end plate 12 has an insertion hole 12a.
And a pair of reinforcing girders 16 is provided over the entire length. The reinforcing girders 16 extend in the longitudinal direction of the end plate 12 with the width direction coinciding with the longitudinal direction of the segment 10, and are fixed to the inner surfaces of the end plate 12 and the main girder 11 by welding. In this case, both end portions of the reinforcement girder 16 on the inner side overlap with the outer surface of the reinforcement girder 15 on the main girder side, and this portion is also welded.

The inner side of the segment 1 and each of the through holes 11
a, a joint recess 17 is formed to communicate with a. The joint recess 17 is necessary as a space for fastening the joint bolt B by passing the joint bolt B through the insertion holes 11a and 12a when connecting and connecting the segments 10 with the joint bolt B. Joint recess 17 and insertion hole 11
Concrete 14 exists between a and 12a. Naturally, in this portion of the concrete 14, there is formed an insertion hole 17a for inserting a joint bolt from the joint recess 17 to the insertion holes 11a and 12a. Here, it is located above and below the insertion hole 12a provided on the inner surface of the end plate 12 .
As shown in FIG. 4, the pair of reinforcing girders 16 are joint bolts.
B is inserted and fixed in the insertion holes 12a and 17a.
At this time, the head of the joint bolt B is at the end of the pair of reinforcing girders 16.
So that the pair of reinforcing girders 16, 16 are separated from each other.
The distance is set.

A reinforcing mesh 18 is stretched inside the frame 13. The reinforcing bar mesh 18 is formed by reinforcing bars extending in the longitudinal direction and the width direction of the segment 10 into a lattice shape, and reinforcing the main girder 11 with the reinforcing bar extending in the width direction facing the inner surface side of the segment 10. Digit 15
A portion arranged on the lower surface and in contact with the main girder 11, the end plate 12, and the lower reinforcing girder 16 is fixed by welding. (Note that FIG. 1 does not show the reinforcing mesh 18).

The above is the basic configuration of this embodiment. FIGS. 5 and 6 show variations based on the above configuration. The segment 10A in FIG. 5 is provided with a similar reinforcing girder 15 in parallel with the reinforcing girder 15 on the outer surface of the reinforcing girder 16 on the outer surface of the reinforcing girder 16 on the end plate 12 side. A reinforcing bar mesh 18 similar to the reinforcing bar mesh 18 is stretched on the outer surface side. In addition, the segment 10B in FIG. 6 is the reinforcing girder 1 added in the segment 10A.
5. Instead of the reinforcing mesh 18, a skin plate 19 constituting the outer surface is stretched while being fixed to the main girder 11 and the end plate 12. On the inner surface of the skin plate 19,
As one means for improving the degree of connection with the concrete 14, a dowel 19a is formed so as to protrude. Note that, other than such a dowel 19a, a lattice-shaped groove, a ridge, or the like can be considered on the inner surface of the skin plate 19.

Now, the segment 10 (10
A and 10B), since the concrete 14 is cast in the steel frame 13, it has the advantages of both conventional concrete and steel. That is, the compression is to be performed by the concrete 14 and the tension is to be received by the frame 13. Moreover, the reinforcing girders 15 and 16 are fixed to the inner surface of the frame 13, and the reinforcing mesh 18 is stretched. In particular, it has improved strength against pulling, and is therefore a suitable segment for a sharply curved portion of a tunnel. In addition, unlike a simple steel segment, the inner peripheral surface is pre-finished with concrete 14, so there is an advantage in construction that does not require a secondary lining.

Also, since concrete 14 exists between the main girder 11 and the end plate 12 and the joint recess 17,
Joint bolt B passed through insertion holes 11a, 12a, 17a
Does not directly contact the main girder 11 and the end plate 12, or only a small part of the contact is required. This is advantageous.

When the segments 10 are connected to each other by the joint bolts B passing through the insertion holes 11a, 12a, 17a, the reinforcing beams 15, 16 are close to the insertion holes 11a, 12a. Reinforcement girders 15 and 16 are to be received. In addition to this, since the concrete 14 is sandwiched between the joint recesses 17 of the two segment joint recesses 10 and the joint bolt B becomes longer, the main girder is simply provided. Compared with the case where the end plates 12 and the end plates 12 are connected to the joint bolts B, the main girder 11 and the end plates 12 are less likely to be distorted, and the joint strength is improved.

In further manufacturing, the frame 13 is assembled with the main girder 11 and the end plate 12 to which the reinforcing girder 15 and 16 have been welded in advance, a reinforcing steel mesh 18 is stretched, and then the concrete 14 is placed inside the frame 13. It can be cast at low cost without the need for a special mold having a complicated structure.

Further, unlike a mere steel segment, since the inner peripheral surface is preliminarily finished with the concrete 14, there is an advantage in construction that secondary lining is not required.

[0020]

As described above, according to the segment for tunnel lining according to the present invention, it is composed of a steel main girder and an end plate having a reinforcing girder fixed to the inner surface over the entire length in the longitudinal direction. It is a structure in which concrete is cast inside the framed body, so it has the advantages of both concrete and steel, that is, it has sufficient strength against both compressive and tensile forces, and as a result It is particularly suitable for sharp curves in tunnels, and the reinforcing girder should be close to the joint bolt insertion hole .
And the joint bolt heads at the ends of a pair of reinforcing girders
The contact strength of the joint bolt is strengthened by a pair
Digit Ri Do that directly transmitted the news an effect such between the main girder and the end plate and the fitting recess from the reside concrete, improvement of the joint strength of the segments to each other is achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention in which a concrete segment and a reinforcing mesh are omitted.

FIG. 2 is a plan view of the segment of the embodiment before concrete casting.

FIG. 3 is a front sectional view of the segment of the embodiment.

FIG. 4 is a partial side sectional view of the segment of the embodiment.

FIG. 5 is a front sectional view of a modification of the segment of the embodiment.

FIG. 6 is a front sectional view of another modification of the segment of the embodiment.

[Explanation of symbols]

 10, 10A, 10B segment 11 main girder 11a, 12a insertion hole 12 end plate 13 frame 14 concrete 15, 16 reinforcing girder 17 joint recess 18 steel mesh B joint bolt

Claims (2)

(57) [Claims] 1. A pair of steel main girders extending in an arc shape are arranged in parallel and opposed to each other, and both ends thereof are respectively connected by a pair of steel end plates which are opposed to each other in parallel to form an arc plate. Tunnel lining in which a frame is assembled, and a plurality of joint bolt insertion holes are formed in the main girder and end plate at intervals in the longitudinal direction, and concrete is cast inside the frame. In the segment for use, a reinforcing girder extending in the longitudinal direction over the entire length of the main girder and the end plate is fixed to a position on the inner surface of the main girder and the end plate at least in the vicinity of the insertion hole. In addition, a joint recess communicating with the insertion hole is formed, and the reinforcing girder is located above and below the insertion hole.
And the joint bolt is provided in the insertion hole.
When the bolt is inserted into the
The pair of reinforcing girders is abutted against the ends of the pair of reinforcing girders.
A segment for tunnel lining , wherein the separation distance is set . 2. In addition to the reinforcing girder, inside the frame body,
2. The tunnel lining segment according to claim 1 , wherein a reinforcing mesh is stretched while being fixed to the main girder and the end plate.