JPH04297697A - Device for tightening segment - Google Patents

Abstract

PURPOSE:To obtain the longitudinal tightening construction of a structure such as a tunnel having a flexible tightening part. CONSTITUTION:Among a plurality of segments tie rods arranged in the connecting direction are subsequently screwed and connected to connect the segments through the tightening construction, and a tie rod insertion hole 1 is provided in the connecting direction of each segment S. Tightening nut keepers 8 and 8' are provided respectively to an opening of the front end side and an opening of the rear end side of the hole, and a tie rod 3 having screws 3a and 3c on both ends thereof is placed into the insertion hole 1 by screwing tightening nuts 4 to the rear ends of them. The tie rod 3 for each segment S is connected through the tightening nuts 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment fastening structure for sequentially fastening a plurality of segments such as tunnels, segments serving as foundations of buildings, or segments serving as wall materials of buildings such as buildings.

0002

[Prior Art] The present applicant has already invented and applied for a segment fastening fitting useful as a fastening means for fastening segments of tunnels, building foundations, wall materials, etc. (Japanese Patent Application No. 61-263476). , Jitsugan Showa 62
-143386).

The above-mentioned fastening fittings are as shown in FIG.
Two metal fittings A1 and A2 arranged on the end face of each segment
The overall external cross section formed by joining at the lip part is approximately H-shaped, and the fastening hole A is wedge-shaped in the depth direction of the figure (direction perpendicular to the plane of the paper). The fastening piece B has a substantially H-shaped cross section and is wedge-shaped in the depth direction of the figure (perpendicular to the plane of the drawing).When the fastening piece B is inserted into the fastening hole A, the wedge Using this action, accurately position the two segments S (Sa, Sb) and make them strong (with great rigidity)
can be concluded. This fastener has a great feature in that the work of fastening the segments can be performed much more easily than conventional fasteners.

0004

[Problems to be Solved by the Invention] However, depending on the target structure to be fastened, the structure composed of consecutive segments may not be suitable as a whole in the lateral direction, etc. (direction having an angle to the longitudinal direction, etc.). It may be better to be able to transform into For example, in the case of structures such as long sewers or undersea tunnels, when a large stress of more than a predetermined value is applied to a part of the structure in the lateral direction with respect to the longitudinal direction, the It is preferable to absorb the stress by deforming the entire body to some extent in that direction.

However, in the case of the above-mentioned fastening fitting, the rigidity of the fastening portion is extremely high, so there is a disadvantage that it cannot be deformed as described above.

The present invention has been made in view of the above-mentioned current situation, and it is an object of the present invention to provide a segment fastening structure that does not have the above-mentioned problems.

[0007]

[Means for Solving the Problems] According to the first aspect of the present invention, the segment fastening structure connects a plurality of segments by sequentially threading tie rods arranged in each segment in the direction in which the segments are connected. This is a fastening structure in which a plurality of segments are connected in a row, the tie rod insertion hole is passed through each segment in the direction in which the segments are connected, and the opening on the front end side and the rear end side of the tie rod insertion hole are provided. A fastening nut receptacle is formed in the opening of each of the tie rods, and the tie rod has a male threaded portion that screws into the fastening nut of the segment already installed at the distal end, and a fastening nut for this segment at the rear end. The tie rod is inserted into the tie rod insertion hole so as to be movable in the longitudinal direction of the shaft, and the tie rod is inserted into the tie rod insertion hole at the rear of the tie rod. A fastening nut for fastening to the tie rod of the next segment is screwed onto the end, and when fastening to the existing segment on the tip side, the rear end of the tie rod is fixed to the existing segment with two segments adjacent to each other. Rotate the male thread at the tip of the tie rod of the segment on the rear end side (the side to be fastened) with the coupling nut at its rotating engagement part, and after the threading is completed, screw the male thread at the tip of the tie rod on the rear end side (the side to be fastened). A fastening nut screwed onto the rear end of the segment is tightened until a predetermined tensile force is applied to the tie rod, thereby sequentially fastening each segment.

[0008] Furthermore, the segment fastening structure according to the second aspect of the present invention connects a plurality of segments by sequentially screwing and connecting tie rods arranged in each segment in the direction in which the segments are connected. A fastening structure in which the tie rod insertion hole is passed through each of the segments in the direction in which the segments are connected, and a predetermined tensile force is generated in the tie rod in a yielding state at the opening on the tip side of the tie rod insertion hole. A disc spring receiving seat for tightening and a fastening nut receiving seat are respectively formed in the opening on the rear end side, and a male thread is screwed into the tie rod to the fastening nut of the segment already installed on the distal end side of the tie rod. A male threaded portion for screwing a fastening nut of this segment and a rotating engagement portion for rotating this tie rod are formed at the rear end of the segment, and the tie rod is inserted into the tie rod so as to be movable in the longitudinal direction of the shaft. At the same time as inserting it into the mounting hole, insert a disc spring into the tip side of the above tie rod, screw the tightening nut to the rear end to fasten it to the tie rod of the next segment, and tighten it to the existing segment on the tip side. , place the two segments adjacent to each other, and connect the external threaded portion of the tie rod tip of the segment on the rear end side (the side to be fastened) to the connecting nut on the rear end of the tie rod fixed to the existing segment. After the screwing is completed, tighten the fastening nut screwed onto the rear end of the segment on the rear end side until the coned disc spring reaches the yield state, and then tighten each segment. It is characterized by being configured to close the gap between the two.

Furthermore, the segment fastening structure according to the third aspect of the present invention connects a plurality of segments by sequentially screwing and connecting tie rods arranged in each segment in the direction in which the segments are connected. The fastening structure is a fastening structure in which each of the segments has a tie rod insertion hole passed through in the direction in which the segments are connected, and the fastening nut of the adjacent segment is inserted into the opening on the tip side of the tie rod insertion hole. A grouting agent injection space that is directly or indirectly joined to the end face is provided, a fastening nut receiving seat is formed in the opening on the rear end side, and the segment already installed on the front end side is fastened to the above tie rod. A male threaded portion to be screwed into a fastening nut of this segment, a male threaded portion to which a fastening nut of this segment is screwed to the rear end, and a rotating engagement portion to rotate this tie rod are formed respectively, and this tie rod is At the same time, a fastening nut for fastening to the tie rod of the next segment is screwed onto the rear end of the tie rod, and when fastening to the existing segment on the tip side, Two segments are placed adjacent to each other, and the male threaded portion of the tie rod tip of the segment on the rear end side (the side to be fastened) is connected to the connecting nut on the rear end of the tie rod fixed to the existing segment. After the screwing is completed, tighten the fastening nut screwed onto the rear end of the segment on the rear end side to a specified torque, and then inject the grouting agent into the grouting agent injection space. The present invention is characterized in that it is configured to connect each segment.

0010

[Operation] According to the segment fastening structure according to the first invention, a plurality of segments connected in advance with a compressive force acting on each segment by the tie rod can be attached to any one of the segments longitudinally. When an external force is applied from a direction other than the above direction and the segment tends to shift from its predetermined position, a stress is applied that tends to extend the tie rod of each segment around the tie rod of that segment. At this time, each tie rod is constrained to its segment or adjacent segment via the fastening nut portion, and therefore extends only within its segment. The external force is absorbed by the entire structure by elongation of the tie rods of each segment centered on the tie rod of the segment on which the external force was applied. For this reason,
Even if external forces such as those described above act, the structure as a whole can flexibly respond.

[0011] Furthermore, the segment fastening structure according to the second invention focuses on the fact that the relationship between stress and strain in the yield state of the material is such that there is almost no change in stress relative to the amount of deformation, as shown in FIG. This property can be used to absorb dimensional errors in the longitudinal direction of each segment disposed in a direction perpendicular to the longitudinal direction of the structure, and to allow slight movement of the tie rod relative to the segment after fastening. According to the segment fastening structure according to the second invention, in addition to the effect of the first invention, the disc spring is interposed between the tie rod and the segment in the above-mentioned state when fastening. Even if there is a dimensional error in the longitudinal direction of each segment arranged in the direction perpendicular to the longitudinal direction of the ring member (in the case of a tunnel, each segment constituting the ring), compressive stress ( This is absorbed by the deformation of the disc spring without much change in spring force), and each tie rod of the segment having the above-mentioned dimensional error can be fastened with substantially equal compressive force acting thereon. This makes the internal stress of the entire structure uniform and contributes to improving the strength of the structure. In addition, if an unexpectedly large external force (e.g., greater than the maximum allowable stress) is applied to a part of the structure in the above-mentioned direction after tightening, each disc spring will contract to the extent that it does not contract. As a result, the fastening nut that fastens between the tie rods of the segments moves by the amount of contraction described above, making it possible to smoothly disperse the stress acting on the tie rods. As a result, the strength of the fastened portion is improved.

Further, according to the segment fastening structure according to the third invention, as described above, each segment (constituting a ring in the case of a tunnel) arranged in a direction perpendicular to the longitudinal direction of the structure Even if there is a dimensional error in the longitudinal direction of each segment), if the tie rod of each segment is tightened to the specified tension and grout is injected into the grout injection space, the tightening nut will release the grout. Since it is fixed to each segment through the dimensional error, the internal stress of the entire structure can be made uniform, and this contributes to improving the strength of the structure as in the second invention.

[0013] Then, if each segment is fastened as in each of the above-mentioned inventions, each segment will become PC(
As with pre-stressed concrete, internal stress (compressive force) is applied by tie rods, making it possible to construct extremely strong structures against external tensile stress.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a case will be explained in which the present invention is implemented as a fastening structure for tunnel segments.

FIG. 1 is a sectional view taken in the circumferential direction of a tunnel wall showing a state of fastening between a plurality of segments according to an embodiment of the present invention, and FIG. 2 is a tunnel wall showing the structure of the connecting portion at both ends of a tie rod. FIG. 3 is an enlarged sectional view similar to FIG. 2 showing a state before the adjacent tie rods are fastened.

In the figure, S represents a segment in a general sense, S1 and S2 represent adjacent segments in the longitudinal direction of the tunnel, and Sa and Sb represent adjacent segments in the ring direction. In addition, R is the segment Sa, S
The above-mentioned fastening fitting 1 connects b in the direction between the so-called pieces of the tunnel (in the vertical direction in FIG. 1) to form a ring.
is the direction in which segments S are connected (direction between rings of tunnel)
2 is a metal sleeve forming the circumferential surface of the tie rod insertion hole 1, 3 is a tie rod, 4 is a fastening nut composed of a tall nut, and 5 is a disc spring.

The tie rod insertion hole 1 is located at the center of the thickness of a ring (partially shown in FIG. 1) formed of a plurality of segments S (Sa, Sb, . . . ) (the center of the member thickness of the segments). , a plurality of rings (tunnels) are formed on the concentric circumference of the center line of the ring (tunnel), parallel to the center line, and spaced at equal intervals.

As shown in FIGS. 2 and 3, a tip opening fitting 1A having a cylindrical space 1a therein is provided at the opening on the tip side of the tie rod insertion hole 1 for inserting the tie rod. The cylindrical space 1a of the end opening metal fitting 1A has an enlarged diameter hole shape with respect to the tie rod insertion hole 1, and the stepped portion thereof is disposed integrally and concentrically with the hole 1.
b.

The disc spring 5 is disposed in the cylindrical space 1a of the end opening fitting 1A, and a locking member is provided in the annular groove at the open end of the cylindrical space 1a to prevent the disc spring 5 from slipping out. Metal fittings (snap ring-shaped in this example)
6 are arranged. The inner diameter of this locking fitting 6 is configured to be slightly larger than the outer diameter of the fastening nut 4, and is configured to allow for dimensional errors in the radial or circumferential direction of the ring (tunnel) when the segments S1 and S2 are fastened. ing.

Further, at the opening on the rear end side of the tie rod insertion hole 1, a rear end opening fitting 1B having a cylindrical space 1d inside is provided integrally and concentrically with the tie rod insertion hole 1. The cylindrical space 1d of the rear end opening fitting 1B is
is a hole with an enlarged diameter relative to the tie rod insertion hole 1, and its stepped portion 1e
is formed into a tapered shape, and the depth of the cylindrical space 1d of the rear end opening metal fitting 1B is deep enough to accommodate the fastening nut 4. Further, a space 1f for inserting a tool in the form of an enlarged diameter hole for tightening (rotating) the fastening nut 4 is formed at the open end of the rear end opening metal fitting 1B.

Furthermore, the tie rod 3 has a male threaded portion 3a formed at its tip end to be screwed into the fastening nut 4 on the tip side, and a hexagonal hole (
A male threaded portion 3c is formed to be screwed into the rotational engagement portion) 3b and the fastening nut 4.

Furthermore, in this embodiment, the tie rod 3 is provided for centering when it is inserted into the tie rod insertion hole 1, and for preventing the fastening nut 4 from rotating together when the tie rod 3 is rotated. A washer 7 with a tapered seat surface is interposed between the rear end opening metal fitting 1B and the fastening nut 4, and the open end surface of this washer 7 seats the fastening nut receiving seat 8 inside the cylindrical space 1d. is forming. Further, between the rear end opening metal fitting 1B and the fastening nut 4, a fixing member made of foamed rubber or foamed polystyrene is provided to prevent the fastening nut 4 from falling off before fastening and to prevent co-rotation when the tie rod 3 rotates. 9 are arranged. In practice, this fixing member 9 is preferably formed into a tapered shape with a smaller diameter on the distal end side for ease of insertion.

Further, in this embodiment, the distal end surface of the disc spring 5 forms a fastening nut receiving seat 8'.

By the way, three of the disc springs 5 are arranged in series and have stress-deformation (compression dimension) characteristics as shown in FIG. 6, and the two segments are fastened together. until it reaches a yield state (outside the proportional elastic region; for example, up to the position of broken line A in Figure 6).
The fastening nut 4 is tightened and used.

[0025]The present fastening structure constructed as described above operates as follows during fastening. First, segment before fixation (segment to be fastened) S2
As shown in FIG. 3, a tie rod 3 with a washer 7 and a fastening nut 4 screwed onto the rear end side is inserted into the tie rod insertion hole 1 so that the fastening nut 4 is attached to the rear end opening metal fitting 1B. The disc spring 5 is inserted so that it is disposed in the cylindrical space 1d, and so that its tip protrudes from the tip opening fitting 1A toward the tip side, and is mounted on the tie rod 3 in the cylindrical space 1a of the tip opening fitting 1A. is arranged and its tip is locked with a locking fitting 6, and a fixing member 9 is inserted into the gap between the fastening nut 4 and the cylindrical space 1d of the rear end opening fitting 1B.

The segment S2 set in this state is connected to the existing segment S2 as shown in FIG.
First, insert the tip of a hexagonal wrench into the hexagonal hole 3b to connect the segment S2.
As shown in FIG. 2, by rotating the tie rod 3 of
Screw into the fastening nut 4 of the existing segment S1. At this time, since the fastening nut 4 at the rear end of the tie rod 3 is fixed by the fixing member 9, it does not rotate together. When sufficient screwing is achieved, the tip of the impact wrench is then inserted into the tool insertion space 1f, and the fastening nut 4 of the segment S2 is rotated. This rotation is performed until the disc spring 5 of the segment S2 reaches a yield state (for example, up to the broken line A in FIG. 6), and in this state, the tip end of the fastening nut 4 of the existing segment S1 is rotated. The tie rod 3 of the segment S2, which is screwed into the segment S2, is in a state where a tensile force of the maximum allowable stress is applied.

As a result, the tie rod 3 of the segment S2 to be newly connected is placed on the rear end side (FIGS. 2 and 3).
segment S1, S2
A sealing material (not shown) disposed on the connecting surface between them is crushed, and the new segment S2 is connected to the existing segment S1 without any gap, and an internal stress (compressive force) is generated in this segment S2.

[0028] And the following (
If an external force of a magnitude (less than the maximum allowable stress) is applied, the tunnel can remain in its original state, and a part of the structure will be exposed to an unexpected force (greater than the maximum allowable stress). When an external force is applied, each disc spring contracts up to its uncontracted portion (the amount from dashed line A to B in Figure 6), and the fastening nut that connects the tie rods of the segments moves by the amount of contraction mentioned above. The stress acting on the tie rods is smoothly dispersed, and the maximum stress acting on one tie rod is reduced.

[0029] In this way, the existing fastening fittings (see Fig. 1)
The rings of the segments S connected in a ring shape are sequentially connected to construct a desired tunnel.

Next, regarding another embodiment, FIGS. 4 and 5
Explain with reference to.

In the figure, S (S1, S2) is the segment, and 1 is the direction in which the segments S (S1, S2) are connected (
2 is a metal sleeve forming the circumferential surface of the tie rod insertion hole 1; 3 is a tie rod; 4 is a fastening nut consisting of a tall nut; 7; is a washer, and each of the above components is constructed in the same manner as in the embodiment described above.

However, there are differences in the following configurations. That is, in the cylindrical space 1a of the tip opening fitting 1A,
A grout injection space 13 is formed. The opening part at the tip of this grouting agent injection space 13 is elastically supported by a spring 11 so that the tip side comes into contact with the rear end surface of the fastening nut 4 of the adjacent segment S, and the rear end of the cylindrical space 1a. Seal member 10 that can freely move backward to the side
is provided. Further, the distal end of the seal member 10 is locked by a locking fitting 6 so that it does not protrude from the cylindrical space 1a.

Furthermore, the inner surface side (upper side in FIGS. 4 and 5) of the cylindrical space 1a in which the seal member 10 is disposed
One end of a grouting agent injection passage 12 whose other end is open to the inner surface Si of the segment S is open to the grouting agent injection passage 12 .

[0034]The present fastening structure configured as described above operates as follows during fastening. As in the embodiment according to the first invention described above, first, as shown in FIG. 5, in the segment S2 before fixing, a washer 7 and a fastening screw are installed in the tie rod insertion hole 1 on the rear end side. nut 4
The tie rod 3 screwed thereon is arranged so that the fastening nut 4 is arranged in the cylindrical space 1d of the rear end opening fitting 1B, and the tip end is inserted through the inner hole of the seal member 10.

The segment S2 set in this state is replaced with the existing segment S2 as shown in FIG.
1, and as in the above embodiment,
Connect the tie rod 3 of the segment S2 to its hexagonal hole 3b.
Insert the tool and rotate it, as shown in Figure 4.
Screw into the fastening nut 4 of the existing segment S1. Next, the tie rod 3 of the segment S2 whose tip end is screwed into the fastening nut 4 of the segment S2 to be fastened is screwed into the fastening nut 4 of the existing segment S1.
is rotated until a predetermined tension is applied to the tie rod 3 in the same way as in the above embodiment, and the segment S1 is connected to the segment S1.
2 will be concluded.

As a result, the tie rod 3 of the segment S2 to be newly connected is pulled toward the rear end (to the right in FIG. 4), and the sealing material (not shown) disposed on the connection surface between the segments S1 and S2 is pulled. is crushed, the new segment S2 is connected to the existing segment S1 without a gap, and internal stress (compressive force) is generated in this segment S2.

When the above-mentioned fastening is completed, grout is injected into the grout injection space 13 from the grout injection passage 12 opened to the inner surface Si of the newly connected segment S2. At this time, since the tip of the cylindrical space 1a is sealed with the seal member 10, the grout will not leak to the tip side.

[0038] After a predetermined period of time has elapsed, the grouting agent hardens (solidifies), and the sealing member 10 cannot move backward, and the fastening nut 4 of the segment S1 on the distal end side has its rear end surface aligned with that on the rear end side. The segment S2 is locked at the distal end surface of the seal member 10.

[0039] In this way, the rings of the segments S connected in a ring shape are successively connected, and a desired tunnel is constructed.

In both of the fastening structures according to the above two embodiments, the other surface of the washer serving as the fastening nut receiving seat is formed in a tapered shape, so that when tightening the fastening nut, the tie rod is inserted. It is aligned so that it is concentric with the mounting hole,
Further, when rotating the tie rod, resistance increases and the fastening nuts do not rotate together.

Furthermore, as mentioned above, since the fastening nut is fixed in the cylindrical space of the rear end opening fitting by the fixing member before the segments are fastened, it may fall off when the segments are moved. do not have.

[0042] In addition, in the case of the first embodiment, the second
Since there is no need to inject grouting agent after fastening as in the example above, the finishing work on site can be simplified, but depending on the type of structure, there may be some contraction of the unshrinked portion of the disc spring after fastening. If this is not preferable, the first embodiment may be configured to have a disc spring and a grouting agent injected after the fastening, as in the second embodiment.

By the way, in the above embodiment, a hexagonal hole is provided at the rear end of the tie rod as a rotational engagement portion for rotating the tie rod, but in order to reduce the manufacturing cost of the tie rod, it is necessary to It is desirable to form a screw hole and screw a hexagon head bolt into the screw hole.

[0044] In the above embodiments, the explanation was given exclusively to the fastening structure of the segments of a tunnel, but the fastening structure can be similarly applied to segments as the foundation of a building or as wall materials of a building or other structure. Needless to say, similar effects can be obtained.

[0045]

According to the present invention, as described above, even if an external force is applied to a part of a structure such as a tunnel from a direction other than the longitudinal direction, the entire tie rod can be fixed around that part. By expanding, the entire structure can flexibly absorb external forces.

For this reason, instead of the above-mentioned fastening fittings, which have the disadvantage of being too rigid as a longitudinal fastening structure (fastening structure between rings) such as a tunnel, fastening using traditional U-shaped bolts is recommended. In place of the structure, it can be used as a fastening structure that is structurally simple, has excellent workability, and is highly safe.

[0047] Therefore, by fastening the so-called pieces of the segments using the above-mentioned fastening fittings and fastening between the rings of the segments according to the present invention, it is possible to construct a longitudinally long structure having excellent performance against external forces, etc. can.

Furthermore, since the fastening structure according to the present invention is configured as described above, it is possible to promote robotization as in the case of the conventional fastening fittings, and as a result, it is possible to promote the robotization of long structures in the longitudinal direction. can be easily constructed with high workability, thus making it possible to significantly shorten the construction period.

[Brief explanation of drawings]

FIG. 1 is a circumferential cross-sectional view of a tunnel wall showing a state of fastening between a plurality of segments according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken in the longitudinal direction of a wall surface of a tunnel, showing the configuration of the connecting portions at both ends of the tie rod.

FIG. 3 is an enlarged sectional view similar to FIG. 2 showing a state before adjacent tie rods are fastened.

FIG. 4 is an enlarged view of the main part of FIG. 1 showing the configuration of the connecting portions at both ends of a tie rod similar to FIG. 2 showing an embodiment of the present invention.

FIG. 5 is an enlarged view of the main parts similar to FIG. 4, showing a state before adjacent tie rods are fastened.

[Fig. 6] Stress of the disc spring showing the usage state of the disc spring.
It is a distortion diagram.

[Explanation of symbols]

S (S1, S2)...Segment 1...Tie rod insertion hole 1b...Disc spring receiver 3...Tie rod 3a...Male thread part 3b...Rotating engagement part 3c…Male thread part 4...Tightening nut 5...Disc spring 8...Tightening nut receiver 8'...Tightening nut receiving seat 12...Gouting agent injection passage 13...Gouting agent injection space

Claims (3)

[Claims] Claim 1: A fastening structure for connecting a plurality of segments by sequentially screwing and connecting tie rods arranged in each segment in the direction in which the segments are connected, wherein each of the segments A tie rod insertion hole is passed through the tie rod insertion hole in the direction in which the tie rod is connected, a fastening nut receiving seat is formed in the opening on the front end side and the opening on the rear end side of the tie rod insertion hole, and the tie rod is inserted into the tie rod at the front end. At the front end, there is a male threaded part that screws into the fastening nut of the existing segment, and at the rear end, there is a male threaded part into which the fastening nut of this segment is screwed, and a rotating engagement part that rotates this tie rod. , the tie rod is inserted into the tie rod insertion hole so as to be movable in the longitudinal direction of the shaft, and a fastening nut for fastening to the tie rod of the next segment is screwed to the rear end of the tie rod, When fastening to an existing segment on the tip side, place the two segments adjacent to each other, and insert the male thread at the tip of the tie rod of the segment on the rear end into the coupling nut at the rear end of the tie rod fixed to the existing segment. The rotary engagement part is rotated to screw them together, and after the screwing is completed, tighten the fastening nut screwed onto the rear end of the segment on the rear end side until a predetermined tensile force is applied to the tie rod. A segment fastening structure characterized in that the segments are fastened in sequence. 2. A fastening structure for connecting a plurality of segments by sequentially threading and connecting tie rods arranged in each segment in the direction in which the segments are connected, wherein each of the segments A tie rod insertion hole is passed through the tie rod insertion hole in the continuous direction, and a disc spring receiving seat is formed in the opening on the front end side of the tie rod insertion hole, and a fastening nut receiving seat is formed in the opening on the rear end side of the tie rod insertion hole, respectively. To the tie rod above,
A male threaded part on the tip end that screws into the fastening nut of the segment already installed on the distal end side, a male threaded part on the rear end that threads the fastening nut of this segment, and a rotating engagement part that rotates this tie rod. The tie rods are inserted into the tie rod insertion holes so as to be movable in the longitudinal direction of the shaft, and a disc spring is inserted into the tip side of the tie rods to generate a predetermined tensile force on the tie rods in a yielding state. At the rear end, screw together a fastening nut for fastening to the tie rod of the next segment, and when fastening to the existing segment on the tip side, make sure that the two segments are adjacent to each other.
The male thread at the tip of the tie rod of the segment on the rear end side is rotated by the rotational engagement part to screw into the coupling nut at the rear end of the tie rod fixed to the existing segment, and after the screwing is completed, A segment fastening structure characterized in that a fastening nut screwed onto the rear end of the segment on the rear end side is tightened until the disc spring reaches a yielding state to fasten the segments. . 3. A fastening structure for connecting a plurality of segments by sequentially screwing and connecting tie rods arranged in each segment in the direction in which the segments are connected, wherein each of the segments A grouting agent injection space in which a tie rod insertion hole is passed through the tie rod insertion hole in the continuous direction, and the tip side of the tie rod insertion hole is connected directly or indirectly to the end surface of the fastening nut of the adjacent segment. , a fastening nut receiving seat is formed in the opening on the rear end side, and the tie rod has a male threaded part screwed into the fastening nut of the segment already installed on the distal end side, and a rear end. A male threaded portion for screwing the fastening nut of this segment and a rotating engagement portion for rotating this tie rod are respectively formed in the portion, and this tie rod is inserted into the tie rod insertion hole so as to be movable in the longitudinal direction of the shaft. At the same time, a fastening nut for fastening to the tie rod of the next segment is screwed onto the rear end of the tie rod, and when fastening to the existing segment on the tip side, the two segments are placed adjacent to each other and fixed to the existing segment. The male thread at the tip of the tie rod of the segment on the rear end side is rotated by the rotating engagement part and screwed into the coupling nut at the rear end of the tie rod, and after the threading is completed, the segment on the rear end side Fastening the segments, characterized in that the fastening nuts screwed onto the rear ends are tightened to a predetermined torque, and then grout is injected into the grout injection space to fasten the segments. structure.