JP4954620B2 - Segment unit rolling correction structure - Google Patents

Description

The present invention relates to a rolling repair structure segment unit when the rolling occurs during segment ring laying constituting the lining of the underpass tunnel intersecting line and, road steric.

An underpass tunnel that intersects with tracks and roads is composed of a tunnel section buried in the ground and an approach section that connects the tunnel section and the ground. It is possible to continuously construct all lines (for example, refer to Patent Document 1). In the underpass tunnel, the tunnel portion is configured by joining segment rings, and the approach portion is configured by joining segments having a substantially U-shaped cross section that are cut out so that the upper portion of the segment ring opens to the ground. . In this document, these segment rings and segments having a substantially U-shaped cross section are collectively referred to as segment units.
According to the shield construction method, an underpass tunnel can be constructed without excavating tracks and roads, so that the construction period and construction cost can be reduced, and the traffic network is not blocked.
JP 2005-248546 A

By the way, in the underpass tunnel, a phenomenon called rolling in which the segment ring constituting the lining portion rotates (inclines) around the tunnel axis may occur due to construction errors or geometric factors.
For example, geometrical factors that cause rolling will be described with reference to FIG. FIG. 8 shows an inclined part including an approach part of an underpass tunnel having a rectangular cross section, where (a) is a plan view and (b) is a longitudinal sectional view. In this example, the inclined portion is configured to curve in the left-right direction while being inclined downward or upward.
Thus, when the tunnel is curved at the inclined portion, rectangular taper segment rings T having different lengths on both sides are inserted between the curved portions, that is, between the rectangular segment ring S0 and the rectangular segment ring S1. However, since the lengths of both sides of the rectangular taper segment ring T are different, the lower corners P and Q at the joint surface with the rectangular segment ring S1 to be joined next have a length from the rectangular segment ring S0. Due to the difference, the height difference H is generated. This joint surface is inclined, that is, rolled, by the height difference H.

Therefore, if the new rectangular segment ring S1 to be joined to the joining surface of the rectangular taper segment ring T is not rolled (inclined) by the same height difference H, the joints between the rings cannot be joined. In the case of a rectangular segment ring, the subsequent segment rings S1,... Are also tilted by rolling, so that when rolling exceeding the building limit occurs on the inner surface of the tunnel, there is a drawback that hinders the operation of the vehicle or the like.
In the example shown in FIG. 8, rolling occurs in the segment ring S1 arranged in the downward direction with respect to the rectangular taper segment ring T. Rolling will occur in the direction segment ring. It is difficult to correct the rolling of the rectangular segment ring, and even if it can be corrected, there is a drawback that a step due to an angle difference occurs in the entire circumference of the joint between adjacent rectangular segment rings.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a rolling correction structure for a segment unit in which the rolling of the segment ring is corrected and a step due to the rolling correction is not formed at the top. .

In order to achieve the above object, the rolling correction structure of the segment unit according to the present invention is a rolling correction segment when rolling occurs in one rectangular segment ring when laying the rectangular segment ring constituting the lining portion of the underpass tunnel. A rolling correction structure for a segment unit in which rolling is corrected by joining the units, wherein the rolling correction segment unit has a substantially U-shaped cross section that opens upward, and the first and second joining surfaces Between the rings provided on the second joint surface according to the rolling amount of the one rectangular segment ring. It is provided to the shift position from the position of the joint, the rolling corrective segment unit Upper is adjusted length in the arrangement direction upper end of the segment piece opened both sides are formed so as to substantially coincide with the ground, the junction between the one of the rectangular segments ring and the rolling corrective Segment Unit It is characterized in that no step is generated at the top of the part.
According to the present invention, rolling generated in a rectangular segment ring by joining a rolling correction segment unit having a substantially U-shaped cross section provided in the approach portion directly or via another segment unit to the rolled rectangular segment ring. To correct. At that time, the rolling correction segment unit is provided at the position where the inter-ring joint on the first joint surface is shifted according to the amount of rolling, so the rolling correction segment unit can be joined in a posture that eliminates rolling. Furthermore, the other substantially U-shaped segment unit joined by the inter-ring joint on the second joining surface can be joined in a state where rolling is eliminated.
Therefore, the rolling correction segment unit is open at the top of the rolled rectangular segment ring, so there is no step on the top, and there is no need to reversely apply a secondary lining made of concrete on the inner surface. Also, there is no risk of the fallen concrete falling.

Moreover, it is preferable that the first joint surface of the rolling correction segment is joined to one rectangular segment ring via an inter-ring joint.
By laying a rolling correction segment having a substantially U-shaped cross section adjacent to the rolled rectangular segment ring, rolling can be eliminated at the approach portion.

The rolling correction structure of the segment unit according to the present invention can eliminate the rolling due to the rectangular segment ring by the rolling correction segment having a substantially U-shaped cross section, and the rolling correction segment unit has a U-shaped cross section that opens upward. Secondary lining work is not required, and problems such as collapse caused by secondary lining of concrete due to backlashing can be prevented.

Hereinafter, a rolling correction structure for a rectangular segment ring and a substantially U-shaped segment for rolling correction according to an embodiment of the present invention will be described with reference to FIGS. In the following description, segment rings and U-shaped segments may be collectively referred to as segment units.
As shown in FIG. 1, the underpass tunnel 2 that three-dimensionally intersects with a track, a road, or the like is composed of a tunnel portion 2B constructed in the ground and an approach portion 2A that opens above the ground GL and the tunnel portion 2B. The end portion of the tunnel portion 2B that follows the approach portion 2A and the approach portion 2A is an inclined portion 2C. That is, an inclined portion 2C that gradually increases in depth from the ground GL toward the ground is formed, becomes substantially horizontal at a predetermined depth, and further forms an upward inclined portion 2C that faces the ground at a predetermined point. Has been.

In the construction of the underpass tunnel 2, various known methods can be adopted, but in this embodiment, a rectangular cross-section shield excavator (not shown) is used from the viewpoint of effective use of the cross section and reduction of work period and construction cost. A rectangular segment ring is assembled behind this rectangular cross-section shield excavator.
The segment unit constituting the lining portion of the tunnel portion 2B is composed of a rectangular segment ring 1 as shown in FIG. 2, and is composed of a plurality of segment pieces 4 and 5 arranged in the tunnel circumferential direction.
The rectangular segment ring 1 is formed in a substantially quadrangular frame shape in the basic configuration shown in FIG. 2, and substantially L-shaped segment pieces 4 are arranged at the corners of the four corners, and each L-shaped segment constituting each side of the rectangle. A block-like, for example, rectangular parallelepiped segment piece 5 is joined between the pieces 4 and 4 by an inter-segment joint. In particular, a wedge block-shaped segment piece 5a (5) having a substantially trapezoidal shape in plan view is disposed between the L-shaped segment pieces 4 and 4 on both sides on the upper side, and one set is formed by inserting this segment piece 5a last. A rectangular segment ring 1 is constructed.
A plurality of inter-ring joints 3 are provided at predetermined intervals on the first and second joining surfaces 6a and 6b, which are opposing end surfaces of the rectangular segment ring 1. As the inter-ring joint 3, a push-grip joint or a cone connector that is easy to construct is used.
Push-grip joints are pin-type joints that apply wedges. Insertion-side pin bolts are inserted into holes on the receiving side to obtain a fastening force. Each pin bolt and receiving hole can be engaged with each other. A serrated protrusion and a recess are continuously formed. The cone connector is configured to obtain a fastening force by engaging a truncated cone-shaped male joint having a large number of slits provided with claws at the tip by inserting the male joint into a female joint for storing the claws.

On the other hand, the segment unit constituting the lining portion of the approach portion 2A is composed of a substantially U-shaped segment 8 having a substantially U-shaped cross-section with the upper portion of the segment ring 1 cut off as shown in FIG. Similarly, it comprises a plurality of segment pieces 4 and 5 arranged in the tunnel circumferential direction. The substantially U-shaped segment 8 is provided with substantially L-shaped segment pieces 4 and 4 at the bottom corners of a rectangle, and a block-shaped segment piece 5 is joined therebetween. And the block-shaped segment pieces 5 and 5 are joined to the both sides of each L-shaped segment piece 4 and 4, respectively.
The first and second joint surfaces 7a and 7b, which are opposing end surfaces of the substantially U-shaped segment 8, are provided with the plurality of inter-ring joints 3 described above at predetermined intervals.
Since the substantially U-shaped segments 8 are arranged in the approach portion 2A inclined with respect to the ground GL, the lengths of the block-like segment pieces 5 on both sides are arranged in the arrangement direction as shown in FIG. The upper end is formed so as to substantially coincide with the ground GL.
Each of the segment pieces 4 and 5 described above may be a steel segment, a reinforced concrete segment, or a concrete-filled steel segment.

As shown in FIG. 4, in the present embodiment, when the rectangular cross-section shield excavator is advanced from the tunnel portion 2B toward the approach portion 2A, rolling is performed on the rectangular segment ring 1 laid on the inclined portion 2C of the tunnel portion 2B. A case where the above occurs will be described. This is because, for example, rolling occurs in the inclined portion 2C that is curved due to the above-described geometric factors.
In the case of the inclined surface 2C shown in FIG. 4, when the curve is made while rising up following the rectangular segment ring 1 provided in the inclined portion 2C, the lengths of both sides of the rectangular tapered segment ring T are different. Since the length from the rectangular segment ring 1 is different in the lower end surface corners P and Q of the joint surface T1 with the rectangular segment ring 1 (indicated by reference numeral 1A) to be joined to each other, a height difference H occurs. The joint surface T1 is inclined, ie, rolled, by the height difference H.
Therefore, the rolling rectangular segment ring 1A joined to the joint surface T1 of the rectangular taper segment ring T by the inter-ring joint 3 has a certain angle θ (for example, θ = 3 °) with the tunnel axis C as the central axis shown in FIG. ) To rotate (tilt).
In this embodiment, when rolling occurs on the joint surface T1 of the rectangular taper segment ring T, the rectangular segment ring 1 is laid in a state of rolling to the end of the tunnel portion 2B, and rolling is eliminated in the approach portion 2A. . In the example shown in FIG. 4, a rolled rectangular segment ring 1A is joined to the end of the tunnel portion 2B.

In the present embodiment, in order to eliminate the rolling of the rectangular segment ring 1A, as shown in FIG. 6, the rolling correction substantially U-shaped segment having a U-shaped cross section opened upward at the end of the adjacent approach portion 2A. 15 is joined.
The rolling correction substantially U-shaped segment 15 has the same shape as that of the above-described normal substantially U-shaped segment 8, but the inter-ring joint 13 at the first joint surface 7a provided for joining to the rolled rectangular segment ring 1A. Is different from the normal substantially U-shaped segment 8. The rolling correction substantially U-shaped segment 15 coincides with the normal U-shaped segment 8 and the central axis C, and is installed at a rolling angle θ = 0 ° around the reference line L. It is provided at a position shifted by a rolling angle θ from the position of the inter-ring joint 3 (shown by a two-dot chain line) in the substantially U-shaped segment 8.

In the case of a geometric factor, the rolling angle θ can be calculated in advance from the geometric shapes of the segment rings T, 1A, 15 and the inclined portion 2C of the tunnel, and if the rolling angle θ is known, the ring from the tunnel axis C can be calculated. The rolling displacement R (distance in the circumferential direction) can be obtained from the distance to the inter-joint 3 and the rolling angle θ. Therefore, in the manufacturing stage of the substantially U-shaped segment 8, if the inter-ring joint 13 is provided in advance at a position shifted by the rolling displacement R from the original position (indicated by a two-dot chain line) of the inter-ring joint 3, the rolling correction is performed. A substantially U-shaped segment 15 is obtained. Moreover, in the case of a steel segment, the position of the inter-ring joint 13 may be determined and determined on site.
In FIG. 6, the rectangular segment ring 1A joined to the rolling correction substantially U-shaped segment 15 is indicated by a two-dot chain line. The inter-ring joint 3 provided on the other joint surface 6b of the rectangular segment ring 1A in the rolling state coincides with the inter-ring joint 13 provided on the first joint surface 7a of the substantially U-shaped segment 15 for rolling correction.
Note that the position of the inter-ring joint 3 provided on the other joint surface 7b of the rolling correction substantially U-shaped segment ring 15 is the same as that of the ordinary inter-ring joint 3 of the substantially U-shaped segment 8 shown in FIG.

The substantially U-shaped segment 15 for rolling correction according to the present embodiment has the above-described configuration. Next, a rolling correction method for a rectangular segment ring generated in the tunnel portion 2B of the underpass tunnel 2 will be described with reference to FIGS. explain.
A case where rolling occurs due to geometric factors in the inclined portion 2C of the underpass tunnel 2 will be described as an example. In FIG. 4, the inclined portion 2 </ b> C has a structure that curves in the right or left direction while being inclined upward, for example.
In the inclined portion 2C, the rectangular segment rings 1 are sequentially joined by the inter-ring joint 3, and the rectangular taper segment rings T having different lengths on both sides are joined at a portion where the tunnel curves in the middle. In this case, since the lengths of the both sides of the rectangular taper segment ring T are different as described above, the height difference H on both sides of the joint surface T1 in the joint surfaces T1 and 6a with the rectangular segment ring 1A to be joined next. Occurs.

Therefore, the rectangular segment ring 1A to be joined to the joint surface T1 of the rectangular tapered segment ring T with the inter-ring joint 3 is, for example, as shown in FIG. 5 with respect to the rectangular segment ring 1 joined before the rectangular tapered segment ring T. Joining is performed in a state inclined by a rolling angle θ. The rectangular segment ring 1A in the rolling state is an end of the tunnel portion 2B. When the rolling correction substantially U-shaped segment 15 which is the start end of the approach portion 2A is joined, as shown in FIG. When the position of the character segment 15 is adjusted around the central axis C so that the rolling angle θ = 0 °, and the first joining surface 7a is joined to the joining surface 6b of the rectangular segment ring 1A, the substantially U shape for rolling correction is obtained. Since the inter-ring joint 13 shifted in the segment 15 coincides with the inter-ring joint 3 of the rectangular segment ring 1A in a state where the angle θ is rolled, the male and female are fitted.
Thereby, the rolling of the tunnel portion 2B generated by connecting the rectangular taper segment ring T can be corrected by the approach portion 2A. Since the inter-ring joint 3 on the joint surface 7b facing the joint surface 7a of the rolling correction substantially U-shaped segment 15 is provided at the same position as the ordinary inter-ring joint 3 of the substantially U-shaped segment 8, the following abbreviations By connecting the U-shaped segments 8, the subsequent substantially U-shaped segments 8 can be sequentially joined in a state in which the rolling is eliminated, and the approach portion 2 </ b> A is configured.

Here, the reason why the substantially U-shaped segment 15 for rolling correction is a segment having a U-shaped cross section that opens upward will be described.
When rolling occurs in the tunnel portion 2B, if the rectangular segment ring 1 laid in the tunnel portion 2B is a rolling correction segment, the correction amount between the rolled rectangular segment ring 1 and the rolling correction rectangular segment ring is as follows. If it is large, a step is generated. Therefore, the step must be eliminated by applying a secondary lining 20 made of concrete inside the rectangular segment ring 1 (see FIG. 7). In particular, when the segments 4 and 5 constituting the lining portion are steel segments, secondary lining is always required.
However, in this case, since the upper secondary lining 20 is reversed, it is easy to form an unfilled portion of the concrete, and there is a risk of air bubbles being mixed in. There is also a possibility that 22 collapses. On the other hand, in the present embodiment, a rolling correction segment unit is provided in the approach portion, and since the rolling correction substantially U-shaped segment 15 having a U-shaped cross section that opens upward does not cause a step at the top, The upper secondary lining work can be omitted so that the above problems do not occur.

  As described above, according to the rolling correction structure of the rectangular segment ring 1A and the substantially U-shaped segment 15 for rolling correction according to the present embodiment, rolling occurs due to geometrical or construction factors when the tunnel portion is constructed. However, the rolling of the segment ring T, 1A can be improved by joining the approach portion 2A with the rolling correction substantially U-shaped segment 15 interposed therebetween, and the rolling can prevent the spatial range of the tunnel inner surface from exceeding the building limit. . Moreover, since the upper part of the rolling correction substantially U-shaped segment 15 is open, there is no step at the upper part between the adjacent rolled rectangular segment rings 1, so that secondary lining by the upper concrete can be omitted. In addition, it is possible to eliminate the possibility that the post-cast concrete 22 such as the inside of the bolt box 21 or the ceiling portion collapses.

In the above-described embodiment, the rectangular segment ring 1A (one or more) is joined in a rolling state following the rectangular taper segment ring T that generates rolling, and then the substantially U-shaped segment ring 11 for rolling correction is joined. However, the rectangular segment ring 1A may be omitted, and the rolling correction substantially U-shaped segment 15 may be directly joined to the joint surface T1 of the rectangular taper segment ring T.
Further, the rolling correction substantially U-shaped segment 15 may not be disposed adjacent to the rolling rectangular segment ring 1A provided at the end of the tunnel portion 2B, and one or a plurality of normal (first and first) The position of the inter-ring joint 3 on the second joint surfaces 7a and 7b is not substantially the same or not shifted) The substantially U-shaped segment 15 for rolling correction is joined via the substantially U-shaped segment 8 so as to eliminate rolling. It may be.
Even when rolling occurs due to construction factors such as construction errors, the rolling can be corrected by interposing and joining the rolling correction substantially U-shaped segment ring 15 in the same manner. In this case, since the rolling angle θ cannot always be calculated in advance, the inter-ring joint 13 formed on one joining surface 7a of the substantially U-shaped segment ring 15 for rolling correction may be formed at the tunnel construction site.

  As described above, the segment correction structure according to the embodiment of the present invention and the rolling correction substantially U-shaped segment used therein have been described. However, the present invention is not limited to the above-described embodiment and does not depart from the spirit thereof. It can be changed as appropriate. For example, in the above embodiment, rolling is eliminated by one rolling correction substantially U-shaped segment 15, 25, but when the rolling is large, a plurality of rolling correction substantially U-shaped segments are gradually used. Rolling may be eliminated. In short, it is only necessary to obtain the desired function in the present invention.

It is a schematic whole view of an underpass tunnel. It is a front view of the rectangular segment ring used for the tunnel part of an underpass tunnel. It is a front view of the substantially U-shaped segment used for an approach part. The segment unit near the boundary of the tunnel part and approach part in an inclination part by embodiment of this invention is shown, (a) is a principal part top view, (b) is the sectional side view. It is a front view of the rolled rectangular segment ring. It is a front view which shows the rolling correction structure by the substantially U-shaped segment for rolling correction by the embodiment, and the rolled rectangular segment ring. It is a longitudinal cross-sectional view for demonstrating the fault at the time of making a rectangular segment ring into the segment for rolling correction. It is a figure for demonstrating the geometric factor which a rectangular segment ring rolls in the inclination part of an underpass tunnel, (a) is a top view, (b) is a side view.

Explanation of symbols

1, R0, R1, S0, S1 Rectangular segment ring 2 Underpass tunnel 2A Approach portion 2B Tunnel portion 2C Inclined portion 3, 13, 26 Inter-ring joint 4 Almost L-shaped segment piece 5 Block-shaped segment pieces 15, 25 For rolling correction U-shaped segment T Rectangular taper segment ring C Tunnel axis θ Rolling angle (rolling amount)
R Rolling displacement (rolling amount)

Claims (2)

Rolling correction of a segment unit that corrects rolling by joining a rolling correction segment unit when rolling occurs in one rectangular segment ring when laying the rectangular segment ring that forms the lining part of the underpass tunnel Structure,
The rolling correction segment unit has a substantially U-shaped cross section that opens upward, and has first and second joint surfaces disposed opposite to each other, and the first joint located on the one rectangular segment ring side. The ring-to-ring joint provided on the surface is provided at a position shifted from the position of the ring-to-ring joint provided on the second joint surface according to the rolling amount of the one rectangular segment ring,
The rolling correction segment unit is formed such that the length of the segment pieces on both sides opened upward is adjusted along the arrangement direction so that the upper end substantially coincides with the ground,
A rolling correction structure for a segment unit, wherein no step is formed at the upper part of the joint between the one rectangular segment ring and the rolling correction segment unit.       2. The rolling correction structure for a segment unit according to claim 1, wherein the first joining surface of the rolling correction segment unit is joined to the one rectangular segment ring via an inter-ring joint.

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