JP3559830B2 - Segment joining structure and segment joining method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a segment joining structure in which, when a cylindrical structure such as an underground river or a storage pipe is constructed by assembling a plurality of arc-shaped segments into a cylindrical shape, adjacent segments are joined by butt end portions thereof. And a method for joining segments.
[0002]
[Prior art]
When a cylindrical structure such as a tunnel or an underground river is constructed by assembling a plurality of arc-shaped segments into a cylindrical shape by a shield method, adjacent segments 1 are mutually connected as shown in FIGS. And the joint plates 2a of the joint fittings 2 previously embedded and installed in the mutual joints 1a on the inner surface side of the segment 1 to face each other, and bolts respectively formed on the back surface of each joint plate 2a Using the box 3, a bolt 5 is passed from one bolt box 3 to a bolt through hole 4 of each joint plate 2 a, and a nut 6 is screwed from the opposite bolt box 3 to a tip of the bolt 5. The adjacent segments 1 are joined by joining the joint plates 2 a to each other by fastening with the nut 6 and the nut 6.
[0003]
According to such a segment joining structure, when a circumferential tensile force is generated between the adjacent segments 1 due to internal pressure, or when an axial tensile force is generated between the segment rings due to seismic force. , Bolts 5 and nuts 6 to resist the force and prevent the formation of a gap between adjacent segments 1.
[0004]
[Problems to be solved by the invention]
However, such a conventional segment joining structure has the following problems when a bolt is used for the joining structure of the shield tunnel of the type in which the secondary lining is omitted.
(A) Since the bolts 5 and the nuts 6 are corroded, protection measures are required.
(B) Since the bolt box 3 is opened on the inner surface of the shield tunnel, the smoothness of the inner surface of the shield tunnel is impaired.
(C) The fastening operation using the bolts 5 and the nuts 6 is performed at the time of assembling the segment 1 and is one step of a construction cycle.
[0005]
An object of the present invention is to provide a segment joining structure that can join segments without using bolts and nuts.
[0006]
Another object of the present invention is to provide a segment joint structure that can solve the problem of corrosion at the joint part of the segments.
[0007]
Another object of the present invention is to provide a segment joining structure in which the smoothness of the inner surface of a cylindrical structure is not impaired.
[0008]
It is another object of the present invention to provide a segment joining structure in which fitting of a loop-shaped joint is not one step of a construction cycle.
[0009]
[Means for Solving the Problems]
A structural feature of the present invention is that, when a cylindrical structure such as an underground river or a storage pipe is constructed by assembling a plurality of arc-shaped segments into a cylindrical shape, the structure is adjacent to the axial direction and the circumferential direction. In the segment joining structure in which segments to be joined to each other, the inner surface of each adjacent segment is formed in an open loop-shaped groove symmetrically about the butting surface of the ends of the segments so as to form a loop over both segments. Are provided, and a non-metallic loop-shaped joint having elasticity is fitted into a loop-shaped groove formed by facing the open loop-shaped groove in each adjacent segment, and the adjacent segments are joined to each other. It is in.
[0010]
According to the segment joining structure having such a structure, when a circumferential tensile force is generated between adjacent segments due to internal pressure, or when an axial tensile force is generated between segment rings due to seismic force. Resists that force by means of a loop joint fitted in the open loop groove of the adjacent segment, preventing the formation of a gap between the segments.
[0011]
In particular, in this segment joining structure, since the loop joints that are fitted into the open loop grooves facing each other on the inner surface of the adjacent segments to join these adjacent segments are made of nonmetal, corrosion problems can be avoided, and The smoothness of the inner surface of the cylindrical structure can be maintained. Furthermore, since the fitting of the loop-shaped joint can be performed at any time, it is not one step of the construction cycle.
[0012]
In the present invention, the loop-shaped joint is preferably fixed so as to prevent a part thereof from being deformed by a non-metal wedge driven into the edge of the open loop-shaped groove. When the loop-shaped joint is fixed by the wedges as described above, time-consuming secondary processing such as injection of an adhesive or caulking is not required, and the joining operation can be easily performed in a short time only by inserting and driving. It has excellent workability.
[0013]
In the present invention, the loop joint is preferably formed of a reinforced plastic in which a synthetic resin is reinforced with high-tensile synthetic resin fibers, for example, is formed of a reinforced plastic in which an epoxy resin is reinforced with aramid fibers. A loop-shaped joint made of such a material is made of a non-metallic material, has no risk of corrosion, and is easily mass-produced by molding.
[0014]
The feature of the manufacturing method of the present invention is that, when a cylindrical structure such as an underground river or a storage pipe is assembled by assembling a plurality of arc-shaped segments into a cylindrical shape, the structure is formed on the axial direction and the circumferential direction. In a segment joining method of joining adjacent segments to each other,
On the inner surface of each of the adjacent segments, open loop-shaped grooves are provided in advance symmetrically with respect to the butting surfaces of the ends of the segments so as to form a loop over both,
Positioning the adjacent segments with their joints abutting each other such that the open loop grooves of each other form a loop groove;
The loop-shaped groove is made of a non-metal having elasticity and is approximately equal to the circumferential length of the loop-shaped groove formed by the open loop-shaped groove, but is previously formed into a shape deformed with respect to the shape of the loop-shaped groove. The shape of the loop-shaped joint that has been deformed and fitted to the shape of the loop-shaped groove is substantially the same as the shape of the loop-shaped groove.
A non-metallic wedge is driven into the edge of the open-loop groove so as to compressively deform a part of the loop-shaped joint, so that the loop-shaped joint is fixed to each of the segments so as not to come off.
[0015]
As the non-metallic loop joint having elasticity as described above, the one whose circumference is substantially equal to the circumference of the loop groove, but which is preformed into a shape deformed with respect to the shape of the loop groove is used. Then, when the loop-shaped joint is deformed and fitted into the loop-shaped groove so that its shape is substantially the same as the shape of the loop-shaped groove, the adjacent segments are deformed by the force to return to the original shape after the fitting. Exerts a restraining effect on For this reason, even if the segment joining portion exists right above the cylindrical structure, the loop-shaped joint does not fall off from the loop-shaped groove and fall, thereby improving workability. The loop joint is completely fixed by inserting the loop joint into the loop groove and then driving the wedge into place, whereby the circumferential tensile force due to the internal pressure or the axial tensile force due to the earthquake is generated, and at the same time, the resistance of the loop joint is reduced. A force is generated to prevent a gap from being generated between the segments.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 3 show an example of an embodiment of a segment joining structure according to the present invention.
[0017]
FIG. 1 shows, in an exploded view, a part of a tunnel lining assembled by joining segments according to the invention, on this side the inter-piece joining between the segments 1, 1 which are circumferentially adjacent to the lining. The portion a and the ring-to-ring joint b adjacent in the axial direction of the lining are both continuous with loop-shaped joints 11, 11,.
[0018]
The segments are assembled in the circumferential direction, and between the adjacent segment rings A, the position of the inter-piece joint portion a is shifted in the circumferential direction by half the length of the segment 1. .
[0019]
On the inner surfaces of the segments 1 adjacent to each other at the inter-piece joints a and the inter-ring joints b, the mutual joints a and b of the segments 1 are formed so as to form a loop over both adjacent ones. The open loop grooves 8 are provided symmetrically with respect to the center. In the case of this example, the open loop groove 8 has an arc shape in which the open end sides are in parallel with each other. In each of the adjacent segments 1, a wedge driving groove 9 is provided on the edge of the abutting portion of the open loop groove 8 so as to straddle both segments 1.
[0020]
An elastic non-metallic loop-shaped joint 11 is fitted into a loop-shaped groove 10 which is formed with the mutually open loop-shaped grooves 8 facing each other in the adjacent segments 1, and the adjacent segments 1 are mutually connected. Are joined. The loop-shaped joint 11 is secured by a non-metallic wedge 12 which is driven into a wedge driving groove 9 at a location where the open loop-shaped groove 8 abuts so that a part thereof is compressed and deformed.
[0021]
The loop-shaped joint 11 used here is mainly made of a high-tensile synthetic resin fiber, and is formed of a reinforced plastic obtained by molding the synthetic resin into a predetermined shape with a synthetic resin. Alternatively, it is preferably formed of a reinforced plastic formed in a linear shape.
[0022]
Next, a description will be given of a segment joining method for joining adjacent segments 1 at the joints a and b between the pieces and the rings by using such a segment joining structure.
[0023]
As shown in FIG. 2, the adjacent segments 1 are abutted at their joints a or b and positioned so that the open loop grooves 8 form the loop grooves 10.
[0024]
The loop-shaped joint 11 that fits into the loop-shaped groove 10 and joins the adjacent segments 1 is substantially equal to the circumference of the loop-shaped groove 10 formed by the open-loop-shaped groove 8, and the shape is shown in FIG. The shape of the loop-shaped groove 10 is previously formed into a substantially rhombic shape as shown in FIG. The both ends of the loop-shaped joint 11 thus deformed in the long axis direction of the inner circumference are clearly seen by comparing FIGS. 3A and 3B with the long axis direction of the inner circumference of the oval loop groove 10. Are smaller by δ from both ends.
[0025]
FIG. 1 or FIG. 3 (C) shows that the loop-shaped joint 11 has a shape substantially the same as that of the loop-shaped groove 10 in the loop-shaped groove 10 formed by the open-loop-shaped grooves 8 of the mutually adjacent segments 1. ). As described above, when the loop-shaped joint 11 is deformed and fitted into the loop-shaped groove 10 so that its shape is substantially the same as the shape of the loop-shaped groove 10, a force for returning the deformation of the loop-shaped joint 11 to the original state after the fitting is achieved. Exerts a restraining effect on the adjacent segment 1. For this reason, even if the segment joining portion exists directly above the cylindrical structure that assembles and configures the segment 1, the loop-shaped joint 11 does not fall off from the loop-shaped groove 10 and fall, thereby improving workability. .
[0026]
In such a state, a non-metallic wedge 12 is driven into the edge of the open loop groove 10 to compress and deform a part of the loop joint 11 so that the loop joint 11 is prevented from falling off to each segment 1. . When the wedge 12 is driven into the loop-shaped groove 10 after fitting the loop-shaped joint 11 into the loop-shaped groove 10 as described above, the loop-shaped joint 11 can be completely fixed, and the circumferential tensile force due to the internal pressure or the axial tensile force due to the earthquake occurs. At the same time, it is possible to prevent a resistance force from being generated by the loop-shaped joint 11 and prevent a gap from being generated between adjacent segments 1.
[0027]
When the loop-shaped groove 10 has an elliptical shape, the shape in which the loop-shaped joint 11 is deformed in advance is not limited to the diamond shape described above, and may be a circular shape or the like. That is, the dimension of the loop joint 11 in the same direction is larger than the dimension of the loop groove 10 in the short axis direction, and the dimension of the loop joint 11 in the same direction is smaller than the dimension of the loop groove 10 in the long axis direction. Any shape may be used as long as the shape is deformed.
[0028]
Further, the loop-shaped groove 10 formed by each open loop-shaped groove 8 of the adjacent segment 1 is not limited to an elliptical shape, and may be a circular shape, a rectangular shape with rounded corners, a square shape, or the like. Good.
[0029]
【The invention's effect】
In the segment joining structure according to the present invention, the problem of corrosion is avoided because the non-metallic loop-shaped joint is fitted into the loop-shaped groove formed by the open loop-shaped groove of the adjacent segment to join the adjacent segments. And the smoothness of the inner surface of the cylindrical structure can be maintained. Furthermore, since the fitting of the loop-shaped joint can be performed at any time, there is an advantage that it is not one step of the construction cycle.
[Brief description of the drawings]
FIG. 1 is an exploded plan view showing a part of a lining assembled by joining segments according to the present invention.
FIG. 2 is a main part perspective view showing a joining step in an example of the embodiment of the segment joining structure according to the present invention.
FIG. 3A is a front view of each of the open-loop grooves in the example shown in FIG. 2 in which adjacent loops are provided symmetrically with respect to their mutual abutting surfaces to form loop grooves. (B) is a front view showing a state before deformation of the loop joint fitted in the loop groove, and (C) is a front view showing a state deformed when the loop joint shown in (B) is fitted in the loop groove. is there.
FIG. 4 is a perspective view of a main part of a conventional segment joining structure.
FIG. 5 is a partial sectional view of the same.
FIG. 6 is a perspective view of a fitting used in a conventional segment joining structure.
[Explanation of symbols]
A Segment ring a Joint between pieces b Joint between rings 1 Segment 2 Joint fitting 2a Joint plate 3 Bolt box 4 Bolt through hole 5 Bolt 6 Nut 8 Open loop groove 9 Wedge driving groove 10 Loop groove 11 Loop joint 12 wedge

Claims (5)

When a cylindrical structure such as an underground river or a storage pipe is constructed by assembling a plurality of arc-shaped segments into a cylindrical shape, segment joining that joins the segments adjacent to each other on the axial direction and the circumferential direction with each other. In structure
The inner surface of each of the adjacent segments is provided with an open loop-shaped groove symmetrically about the abutting surface of the joint between the segments so as to form a loop over both of the segments. A segment joining characterized in that an elastic non-metallic loop joint is fitted in a loop groove formed by facing the open loop grooves, and the adjacent segments are joined to each other. Construction. The segment according to claim 1, wherein the loop-shaped joint is secured by a non-metallic wedge driven into an edge of the open-loop-shaped groove so as to partially deform the loop-shaped joint. Joint structure. The segment joining structure according to claim 1, wherein the loop-shaped joint is formed of a material mainly composed of a high-tensile synthetic resin fiber. 3. The segment joint structure according to claim 1, wherein the loop-shaped joint is mainly made of aramid fiber, and is formed by solidifying the fiber with an epoxy resin. 4. When a cylindrical structure such as an underground river or a storage pipe is constructed by assembling a plurality of arc-shaped segments into a cylindrical shape, segment joining that joins the segments adjacent to each other on the axial direction and the circumferential direction with each other. In the method,
On the inner surface of each of the adjacent segments, open loop-shaped grooves are provided in advance symmetrically with respect to the butting surfaces of the ends of the segments so as to form a loop over both,
Positioning the adjacent segments with their joints abutting each other such that the open loop grooves of each other form a loop groove;
The loop-shaped groove is made of a non-metal having elasticity and is approximately equal to the circumferential length of the loop-shaped groove formed by the open loop-shaped groove, but is previously formed into a shape deformed with respect to the shape of the loop-shaped groove. The shape of the loop-shaped joint that has been deformed and fitted to the shape of the loop-shaped groove is substantially the same as the shape of the loop-shaped groove.
A non-metallic wedge is driven into an edge of the open-loop groove so as to compressively deform a part of the loop-shaped joint, and the loop-shaped joint is fixed to each of the segments so as not to come off. Segment joining method.

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