JPH1193588A - Connection part of segment for tunnel and unit for forming tunnel ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect easily and firmly a plurality of segments for tunnel which are adjacent to one another in the circumferential direction of a tunnel and to efficiently perform the construction work of a tunnel wall. SOLUTION: Each of first and second segment bodies has an abutting surface 4 for connecting both the segments to each other on an end along the circumferential direction X of a tunnel, and an interior side dovetail groove M1 is formed in the end on the interior side of the surface 4 and an exterior side dovetail groove M2 is formed in the end on the exterior side of the surface 4. An exterior side connector R1 is provided in the groove M1 of the first segment body and an exterior side connector R2 is provided in an exterior side dovetail groove M2 of the second segment body. When the second segment body is pushed in, insertion of the groove M1 into the connector R2 is effected simultaneously with insertion of connector R2 into the groove M2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a first segment main body which has already been constructed in order to construct a tunnel wall by connecting a plurality of tunnel segment bodies in the circumferential direction of the tunnel using a coupling tool. A connecting portion of the tunnel segment for pushing the second segment body from the near side to the far side along the longitudinal direction of the tunnel and connecting the plurality of tunnel segment bodies to each other in the circumferential direction of the tunnel using a connecting tool. The present invention relates to a unit for forming a tunnel ring for sequentially assembling tunnel rings while connecting them to construct a tunnel wall.

[0002]

2. Description of the Related Art Conventionally, a connecting portion of a tunnel segment body of this kind is used particularly for connecting tunnel segment bodies adjacent to each other in a circumferential direction of a tunnel. When the butt portions formed in the butt portion are butt-connected one after another, a connecting tool is inserted over the dovetail portion formed in both butt portions, and the two tunnel segment main bodies are pulled and connected. The connection tool is, for example, a substantially rectangular member in which a pair of enlarged edges are connected by a flat body, and each enlarged edge is used by being inserted into both dovetail grooves. For this reason, each of the pair of enlarged edges is formed with a holding portion for contacting the dovetail portion and attracting the tunnel segment bodies to each other.

Here, of two tunnel segment bodies adjacent in the circumferential direction of the tunnel, the one constructed first is the first segment body, and the one constructed later is the second segment body. The first segment body and the second segment body are connected to an existing tunnel ring already constructed in the longitudinal direction of the tunnel.
Conventionally, to connect the first segment main body and the second segment main body to the existing tunnel ring,
The connecting tool was used in a so-called retrofitting mode of use. That is, in the retrofitting method, as shown in FIGS. 10 and 11, the first segment main body S1 and the second segment main body S2 are held in a state where the respective butting portions 4 are brought close to each other. Of which, the tunnel longitudinal direction Y
In this method, the connector R is inserted into the dovetail groove M from the working space 10 provided in the vicinity of the central part of the method. The connecting tool R is inserted from the working space 10 in both directions along the tunnel longitudinal direction Y. As a result, the first segment main body S1 and the second segment main body S2 are separated from each other at both ends of the butted ends. Are connected by the connecting tool R. The insertion of the connecting tool R has to be performed using a special pushing device or the like in order to connect the first segment main body S1 and the second segment main body S2 with a predetermined fastening force.

[0004]

However, when the first segment main body S1 and the second segment main body S2 are connected by the above-mentioned conventional so-called retrofitting method, there are the following problems. That is, in the case of the retrofitting method, the first segment main body S1 and the second segment main body S1
A working space 10 for inserting the connecting tool R must be formed in the butting portion 4 with the joint 2, so that the segment body has a cross-sectional defect in the butting portion 4. As a result, not only the connection strength at the butting portion 4 may be reduced, but also a large contact area between the butting portions 4 cannot be ensured. There was also a risk that groundwater would enter. Moreover, when inserting the connecting tool R, it is necessary to generate a predetermined fastening force between the first segment main body S1 and the second segment main body S2. Accurate control is required, and the operation of pushing the connecting tool R is troublesome. Furthermore, since the working space 10 is exposed on the inner surface of the tunnel wall constructed of the first segment main body S1 or the like having the working space 10, the secondary lining may be applied to the inner wall of the tunnel depending on the use purpose of the tunnel. In some cases, the construction of the tunnel wall becomes complicated. As described above, when the above-mentioned conventional so-called retrofitting method is used, there are various inconveniences, and there is still room for improvement.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a connecting portion of a tunnel segment capable of easily and reliably connecting a plurality of tunnel segments adjacent in the circumferential direction of the tunnel. An object of the present invention is to provide a unit for forming a tunnel ring that can make wall construction work more efficient.

[0006]

[Means for Solving the Problems]

(Structure 1) In order to achieve this object, a connecting portion of a tunnel segment according to the present invention, as described in claim 1, attracts a plurality of tunnel segment bodies in a circumferential direction of the tunnel using a connecting tool. In order to connect the second segment body to the already constructed first segment body along the longitudinal direction of the tunnel from the near side to the far side to connect to the already constructed first segment body, the first Each of the two-segment main bodies is provided with a butt portion for coupling with each other at an end along the circumferential direction of the tunnel, and a back dovetail groove portion is formed at the back end of each of the butt portions. A near-side dovetail portion is formed at the near-side end of the butting portion, and a back-side connector is provided in the far-side dovetail portion of the first segment body, and
The front dovetail groove of the segment main body is also provided with a front connector, and when the second segment main body is pushed in, the push of the rear dovetail groove of the second segment main body with respect to the rear connector is performed. The present invention is characterized in that it is configured to be able to simultaneously push the near side connector into the near side dovetail portion of the one-segment body. (Operation / Effect) As in the present configuration, a rear dovetail groove portion and a front dovetail groove portion are formed at respective butted portions of the first and second segment main bodies, and only by pushing in the second segment main body, the rear dovetail groove is formed. If the side dovetails can be connected to each other and the front dovetails can be connected to each other, the connecting operation of the segment body can be extremely simplified. Further, unlike the related art, since it is not necessary to provide a large number of working spaces for connection on the inner side surface of the segment main body, there is no possibility that the connection strength of the butted portion is reduced due to a cross-sectional defect at the butted portion. A large contact area can be ensured, and the inconvenience of groundwater entering the tunnel from the vicinity of the working space can be prevented. Further, since it is not necessary to form a working space for connection as in the related art, the inner side surface of the tunnel wall can be configured to be a smooth surface, and the trouble such as secondary lining can be omitted.

(Structure 2) As described in claim 2, the connecting portion of the tunnel segment according to the present invention, when the second segment main body is pushed into the back side, a load equal to or more than a certain value along the pushing direction. In this case, a protruding member that can be deformed when it is received can be provided at the rear end in the fitting direction of the rear connector and the front connector. (Operation / Effect) As in the present configuration, the rear end of the rear connector in the insertion direction and the rear end of the front connector in the insertion direction,
By providing a protruding member that can be deformed by receiving a pressing load of a certain level or more, the coupling force generated by the coupling tool to attract and connect the first segment main body and the second segment main body to a substantially constant magnitude. It is possible to set. That is, for example, the rear dovetail portion and the front dovetail portion are configured to open at both end surfaces in the tunnel longitudinal direction of the end surface of the first segment main body and the end surface of the second segment main body, respectively. Assuming that the side connecting member and the near side connecting member are inserted from the opening, when the second segment body is pushed in, the projecting member of the back side connecting member becomes the second member.
A pushing force is received from the end face of the segment body already constructed adjacent to the segment body in the longitudinal direction of the tunnel, and one of the projecting members of the near side connecting tool pushes the pushing force from a jack or the like pushing the second segment body. Will be received. At the beginning of the pushing, since the enlarged edges of both the connecting tools can easily attract the first dovetail and the second dovetail, a small pushing force is sufficient. However, with the progress of the pulling of the first dovetail and the second dovetail, the pressing force increases, and when the pressing force increases to a predetermined strength, the protruding member undergoes out-of-plane deformation. The force will be kept constant. As described above, if a protruding member that can be deformed by receiving a pressing load of a certain amount or more is provided at the rear end in the fitting direction of the rear connector and the rear end in the fitting direction of the front connector, As described above, even if the pressing force is not accurately controlled when the connecting tool is pressed, simply pressing the second segment main body,
The first segment main body and the second segment main body can be connected with a fixed fastening force.

(Structure 3) In the unit for forming a tunnel ring according to the present invention, the tunnel rings are sequentially assembled while connecting a plurality of tunnel segment bodies in the circumferential direction of the tunnel using a connecting tool. In order to construct a tunnel wall, the A-segment body to be attached first in the tunnel circumferential direction and the A-segment body along the tunnel longitudinal direction so as to be sequentially connected in the tunnel circumferential direction with the A-segment body interposed therebetween. A B-segment main body that is connected while being pushed to the back side, and a C-segment main body that is finally pushed and connected between two adjacent B-segment bodies with a gap left therebetween,
Each of the C-segment main bodies is provided with a butting portion at each end in the circumferential direction of the tunnel for connecting adjacent ones to each other,
In each of the abutting portions, a dovetail dovetail portion is formed at the back end, and a dovetail dovetail portion is formed at the front end. The B-segment body is provided with a connecting tool in the back dovetail groove portion at both ends thereof, the front dovetail groove portion of the butting portion connected to the existing segment body, and the back dovetail portion of the other butting portion. The C-segment main body is characterized in that the C-segment main body is provided with a connecting tool in the front dovetail groove on both ends. (Operation / Effect) As described above, if the A, B, and C segment bodies are configured, when the connection portions of the two segment bodies to be constructed one after the other are seen, the connection in all the connection portions is the same. The components are attached to the rear dovetail portion of the segment main body constructed earlier and the front dovetail groove portion of the segment main body constructed later. Therefore, as described in the configuration 1, all the segments can be connected by simply pushing the segment body to be constructed later, so that the tunnel ring can be constructed very quickly and reliably, and as a result, the construction of the tunnel wall can be achieved. Work can be made more efficient.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. (Outline) FIGS. 1 and 2 show an outline of a connecting portion of a tunnel segment and a unit for forming a tunnel ring according to the present invention. In the present embodiment, the A-segment main body a, the B-segment main body b, and the C-segment main body c are sequentially connected to the existing tunnel ring TR that is continuously formed in the tunnel circumferential direction X in an annular shape using the connecting tool R. An example in the case of mounting and constructing a new tunnel ring TR will be described. Here, the A segment main body a is a segment main body that is first attached to the existing tunnel ring TR.
That is, it is the segment main body that is connected first in the tunnel circumferential direction X when constructing a new tunnel ring TR. The B segment body b is a segment body sequentially connected in the tunnel circumferential direction X with the A segment body a interposed therebetween. Of the segment bodies forming one tunnel ring TR, the A segment body a and C described later are used. All the segment bodies except the segment body c are the B segment bodies b. The C-segment body c is a last-connected segment body for completing one tunnel ring TR. That is, the C
The segment body c is pushed into and connected to the gap formed by the two B segment bodies b. In addition, these segment main bodies can be constituted by various segments such as a concrete segment and a steel segment in addition to the ductile segment.

The segment main bodies A, B and C are connected to each other using a connecting member R as shown in FIG. FIG.
Shows an aspect when the above-mentioned A, B and C segment bodies are connected.

The connecting member R is substantially rectangular, and has enlarged edges 1 at both edges along the pushing direction Z of the connecting member R. The two enlarged edges 1 are connected by a flat body 2. Each enlarged edge portion 1 is formed with a holding portion 3 for actually attracting the segment main bodies. The interval between the holding portions 3 is configured to be wider toward the back along the pushing direction Z of the connecting tool R.

On the other hand, abutting portions 4 for connecting with adjacent segment bodies are provided at both ends in the tunnel circumferential direction X among the ends of the A, B and C segment bodies. In the butting portion 4, dovetail grooves M are formed at both ends along the tunnel longitudinal direction Y.
In the dovetail groove M, a clamped portion 5 is formed in which the enlarged edge portion 1 of the connecting tool R is inserted and the clamp portion 3 comes into contact. Each dovetail groove M is open at both ends of the end of the segment body along the tunnel longitudinal direction Y, and the connecting tool R is inserted into the dovetail groove M from the opening side, and It is pushed toward the center of the butting portion 4.

The connection between the segment bodies is performed as follows. Here, the case where the A segment main body a and the B segment main body b shown in FIG. 3 are connected is taken as an example. FIG. 3 shows a state in which the A segment main body a is connected to the existing tunnel ring TR.
In FIG. 3, the lower side is the face side of the tunnel shield, and tunnel excavation is performed downward in FIG.
Therefore, the B segment body b connected here is pushed upward in FIG. In the present embodiment, the B
The direction in which the segment body b is pushed in is called the back side, and the opposite direction is called the near side. A dovetail groove M is formed at a total of four locations on both butting portions 4 of the A segment main body a. Of these, the two on the side of the existing tunnel ring TR are referred to as deep dovetail grooves M1, and the other two are referred to as front dovetail grooves M2. The A-segment main body a is attached to the existing tunnel ring TR in a state where the rear-side connecting tool R1 is inserted into both the rear-side dovetail grooves M1. On the other hand, both butting portions 4 of the B-segment body b connected to the A-segment body a are also formed with a dovetail groove M1 and a dovetail groove M2 on the near side. However, in the B-segment main body b, the front-side dovetail groove M2 of the butting portion 4 connected to the A-segment main body a is provided with the front-side connecting tool R2, and the rear dovetail groove M1 of the other butting portion 4 is provided.
Is provided with a rear side connection tool R1. As shown in FIG. 3, in the C-segment main body c, the front-side dovetail groove M2 in each of the butting portions 4 is connected to the front-side connector R.
2 is provided.

When pushing in the B-segment body b, the back-side dovetail groove M1 of the B-segment body b is inserted into the back-side connecting member R1 provided in the back-side dovetail groove M1 of the A-segment body a. At the same time, the A segment body a
The front side connecting tool R2 provided in the front side dovetail groove M2 of the B segment main body b with respect to the front side dovetail groove M2
Insert When the B-segment main body b is further pushed in in this state, the A-segment main body a and the B-segment main body b are attracted and connected by the respective connecting members R1 and R2. In this case, the back side coupling tool R1 can contact the existing tunnel ring TR to obtain a pushing force,
One of the near-side connecting members R2 comes into contact with a pushing means J such as a jack of a tunnel shield, for example, to obtain a pushing force.

The connecting member R according to the present invention has a protruding member T at the rear end in the pushing direction Z, which can contact the existing tunnel ring TR. The projecting member T is provided at one end of both the enlarged edges 1, and the projecting direction thereof is set substantially parallel to the pushing direction Z of the connecting tool R. The reason why the projecting member T is provided on only one of the enlarged edges 1 in this manner is that the connector R is substantially pushed in by the B segment main body b.
Of the dovetail groove M. In other words, if the projecting member T is provided at least on the side, the projecting member T will be located on the line of action of the pushing force by the B segment main body. Absent. In addition, if the mounting of the protruding member T can be completed at one location, the configuration of the connecting tool R can be simplified. As shown in FIG. 2, the mounting of the protruding member T may be performed by fitting it into a concave portion 6 formed at the rear end of the enlarged edge portion 1, or by bonding using an adhesive or the like. You may. Incidentally, the protruding member T may be provided at the rear end of both enlarged edges 1. As shown in FIG. 2, the projecting member T is formed of, for example, a hollow cylindrical member. The protruding member T receives a predetermined pressing force from, for example, the existing tunnel ring TR and deforms out of plane as shown in FIG. That is, when the connecting tool R is pushed in, the A segment main body a and the B segment main body b are gradually attracted, and accordingly, the force required to push the connecting tool R increases. During this time, the protruding member T is elastically deformed. However, when the fastening force reaches a predetermined value, plastic deformation of the projecting member T starts to occur. In this state, the fastening force of the connecting member R no longer increases, and the force for attracting the A segment main body a and the B segment main body b is kept constant.

The principle of operation of the connector R when pushing the B-segment body b will be described below. The combination of the two segment bodies to be connected is AB, BB, BC
In the following description, among the segment bodies connected to each other, the one that is constructed first is referred to as a first segment body S1, and the one that is connected later is referred to as a second segment body S2. In addition, the rear-side coupler R and the front-side coupler R are separately pushed in, but the operating principle of each of the couplers R is the same. That is, the connecting tool R on the back side contacts the existing tunnel ring TR, and the connecting tool R on the near side touches the pushing means J. As is apparent from FIG. 3, any part is turned upside down. You can see that the state is exactly the same. Therefore, hereinafter, the description will be limited particularly to the connection tool R on the back side.

(Connection operation) The existing tunnel ring TR
5 (a) to (d) show a process of pressing the second segment main body S2 using the connecting tool R against the first segment main body S1 attached to the first segment main body. As shown in FIG. 5, the connecting tool R is previously attached to the dovetail groove M of the first segment main body S1. Hereinafter, the dovetail groove M of the first segment main body S1 is referred to as a first dovetail groove M1, and the dovetail groove M of the second segment main body S2 is referred to as a second dovetail groove M2. In the first dovetail portion M1, the holding portion 3 on the side where the projecting member T is not provided among the both holding portions 3 of the connector R is inserted, and the holding portion 3 on the side where the projecting member T is provided is Leave it exposed. Regarding both of the holding portions 3, the holding portion 3 inserted into the first dovetail portion M1 is referred to as a first holding portion 31, and the holding portion 3 inserted into the second dovetail portion M2 is second held. It will be referred to as a section 32.

FIG. 5A shows the first segment main body S1 that has already been constructed and the first segment main body S1.
7 shows a process of bringing the second segment main body S2 closer to the connector R inserted into the first dovetail portion M1. In this process, the connecting tool R and the second segment main body S2 have not yet contacted. As the pressing of the second segment main body S2 proceeds, the second dovetail portion M2 comes into contact with the second holding portion 32 of the connecting tool R, and furthermore, the protruding member T of the connecting tool R in a state where both are in contact with each other.
FIG. 5B shows a state in which the abutment is in contact with the existing tunnel ring TR. In this state, a predetermined fastening force has not yet been generated between the first segment main body S1 and the second segment main body S2. Further, when the second segment main body S2 is pushed into the existing tunnel ring TR, the flat groove portion M2a of the second dovetail groove portion M2 is connected to the second holding portion 32 of the coupling tool R and the first segment main body S2.
1. This fitting is performed when the connecting tool R is connected to the first segment main body S1 and the second segment main body S1.
2 is performed with a predetermined fastening force. In this process, no out-of-plane deformation occurs in the protruding member T, and the connecting member R is connected to the existing tunnel ring T
Not close to R. That is, since the interval between the two holding portions 3 of the connecting member R is configured to be wider toward the back in the pushing direction Z, most of the force for pushing the second segment main body S2 toward the existing tunnel ring TR. Is a component force for attracting the first segment main body S1 and the second segment main body S2. For this reason, the component force for pressing the connecting tool R against the existing tunnel ring TR is not increased to a force required for out-of-plane deformation of the projecting member T. However, in the state of FIG. 5C, a predetermined fastening force is generated in the connecting member R, and when the second segment main body S2 is further pushed in from this state, out-of-plane deformation occurs in the projecting member T. Occurs. In order to cause the out-of-plane deformation of the protruding member T, it is necessary that the end of the protruding member T protrudes from the end of the second segment main body S2 in the state shown in FIG. is there. Fig. 5 (c)
At the time of subsequent pushing, the connecting tool R moves toward the existing tunnel ring TR. As a result, the connecting tool R further protrudes from the first dovetail part M1, and a margin formed by this protruding part has a flat groove part M2 of the second dovetail part M2.
2a invades. In this state, the attraction between the first segment main body S1 and the second segment main body S2 is kept substantially constant. And the second segment body S
FIG. 5D shows a state in which the pressing of No. 2 is completed. It is necessary that the projecting member T in this state has a margin for further out-of-plane deformation to be compressed, or that the out-of-plane deformation has been completed to the maximum extent. Specifically, assuming that a projecting length of the projecting member T in a state where the projecting member T is deformed to the maximum extent is h, the second segment body S
The retraction length of the end of the connecting member R with respect to the end of the second end is the length h.
It needs to be longer. That is, at the time when the projecting member T is completely compressed and deformed, the second segment body S2
Is not in contact with the existing tunnel ring TR, the projecting member T becomes an obstacle and the second
This is because it becomes impossible to bring the segment main body S2 into close contact with the existing tunnel ring TR.

Here, the situation where the projecting member T is deformed out of plane and compressed will be described. For example, FIG. 7 shows the deformation characteristics of the cylindrical member 7 having the shape shown in FIG. The cylindrical member 7 is a simple cylindrical member having both ends opened. When the cylindrical member 7 is compressed in the direction of its own axis X1, the cylindrical member 7 is compressed and deformed in the direction of the axis X1 in the initial stage, that is, from the origin 0 to the point a. Compressive load P is a
When the point is reached, the cylindrical member 7 starts to undergo out-of-plane deformation. Thereafter, as shown from the point a to the point b, even if the pressing is continued for a while, the load P applied to the cylindrical member 7 does not increase and only the out-of-plane deformation proceeds. When the point b is reached, the out-of-plane deformation turns into buckling, and the load P applied to the cylindrical member 7 decreases slightly to the point c. At the point c, the deformation of the cylindrical member 7 is substantially finished, and thereafter, even if the pressing is continued, no compression deformation occurs, and only the load P increases. In the present invention, of the deformation characteristics of the cylindrical member 7, characteristics from point a to point b are used. That is, of the load P for pushing the second segment main body S2, the component force for pushing the connecting tool R toward the existing tunnel ring TR is a load P between the points a and b.
When it is equal to, the taper angle and the like of the holding portions 3 are set so that the component force for attracting the first segment bodies S1 and S2 becomes a predetermined load. However, in the present embodiment, as shown in FIG. 2 or FIG. 4, a projecting member T provided with a flange 8 at least in the center is used. According to this configuration, the cylindrical member 7 has a shape in which the two cylindrical members are connected to each other, and a long deformation stroke capable of generating a constant deformation resistance can be secured. As a result, even when the connecting tool R has a relatively large manufacturing error, the first segment main body S1 and the second segment main body S2 can be connected to each other with a substantially constant attractive force while allowing the manufacturing error. Can be. The protruding member T can be formed using a material that is relatively easily deformed, such as aluminum, copper, lead, or a thin steel material. That is, since the plastic deformation ability is stable with these materials, the protruding member T having a desired deformation property can be easily obtained.

(Manufacturing Tolerance of Connecting Tool, etc.) The width of the flat groove portion M1a related to the first dovetail portion M1 and the second dovetail portion M
2 is equal to the width of the flat groove portion M2a according to the second embodiment.
When the distance between the holding portions 3 is narrow, the first and second holding members 3 are not deformed so much.
The connection between the second segment bodies S1 and S2 ends. FIG. 8 shows an example in which the protruding member T is hardly compressed and deformed. This is because both the flat grooves M1a and M2a
Indicates a permissible limit when the total width is narrower than the distance between the holding portions 3. Conversely, the projecting member T
FIG. 9 shows an example in which the connection is completed by compressing and deforming to the maximum. This indicates an allowable limit when the total width of both flat groove portions M1a and M2a is relatively large with respect to the interval between the holding portions 3.

If the total width of the two flat grooves M1a and M2a does not match the interval between the holding portions 3, the first segment body S1 and the second segment body S1
It may not be possible to connect the two properly. For example, when the total width of the two flat groove portions M1a and M2a is narrow, the connecting tool R is left in the first and second dovetail portions M1 and M2 without looseness. It is. However, as is clear from the examples shown in FIGS. 8 and 9, if the connecting tool R of the present invention is used, the first and second dovetail portions M1 and M2 or the connecting tool R can be used.
While allowing its own manufacturing error to a certain range, the first
-The second segment main bodies S1 and S2 can be connected with a substantially constant fastening force.

Here, the range of a manufacturing error allowable by the connecting tool R and the like will be verified. For the sake of simplicity, it is assumed that there is no manufacturing error in the connecting tool R, and that there is no error in the taper angles of the first and second dovetail portions M1 and M2. That is, a manufacturing error is caused by the first segment body S
1 and in each of the second segment body S2,
It is assumed that it occurs only in the width of the flat groove portions M1a and M2a. First, as shown in FIG. 8, a case where the total width of the flat grooves M1a and M2a is narrower than the distance between the holding parts 3 of the connecting tool R will be discussed. In this case, the holding portion 3
For what is the distance, in particular, the distance at the end of the side where the projecting member T is provided to D _0. On the other hand, as for the total width of the flat groove portions M1a and M2a, the total width at the end abutting on the existing tunnel ring TR is D. The difference between the total width D and the interval D ₀ is that the protrusion length H of the protrusion member T and the holding member 3
And the taper angle formed. As shown in FIG. 8, the taper angle is L: 1.
When the minimum value Dmin of the total width D can take is, Dmin = D ₀ - a (1) - H × (1 / L) × 2. On the other hand, as in FIG. 9, the case where the total width D is wide, the length of the push-in direction Z when the projecting member T is subjected to compressive deformation to maximum When _{h, Dmax = D 0 - h} × (1 / L) × 2 − (2). Therefore, from the formulas (1) and (2), the possible range of the total width D is as follows: D = Dmax−Dmin = (H−h) × (1 / L) × 2− (3) As described above, the manufacturing error of the first dovetail groove M1 and the second dovetail groove M2 depends on the difference between the protruding length H of the protruding member T and the length h in a state where the protruding member T is compressed to the maximum. However, it can be determined that the allowable manufacturing error increases as the deformation stroke of the protruding member T increases.

(Effect) If the connecting portion of the tunnel segment of the present invention is used, the two segment bodies are connected with a substantially constant fastening force only by pressing the second segment body S2 against the first segment body S1. Therefore, the connection work between the segment bodies can be performed quickly. In addition, by providing the connecting member R with a protruding member T that can be deformed out of plane by receiving a constant pressing force, when the connecting member R is pushed in, the first and second dovetail portions M1 and M2 or the connecting member R The first and second segment bodies S1 and S2 can be connected to each other with a substantially constant fastening force while allowing a manufacturing error or the like to a certain extent, and a highly reliable connecting portion can be obtained. In addition, at least AB
If a unit for tunnel ring composed of three types of segment bodies of C is configured, it is not necessary to consider the connection order of the respective segment bodies, and quick connection work can be performed. Then, since all the segment bodies need only be pushed into the existing tunnel ring TR, the tunnel ring TR can be efficiently constructed. In addition, with the connecting portion of the tunnel segment of the present invention, unlike the conventional segment main body, it is not necessary to provide a large number of connection work spaces on the inner surface of the segment main body, and the inner side surface of the tunnel wall is smoothed. It is possible to reduce the time and labor for secondary lining and the like by constructing on a suitable surface.

[Alternative Embodiment] In the above embodiment, the protruding member T is provided on only one of the rear end portions of both the holding portions. However, it can be provided on both rear end portions. In this case, since the two projecting members T come into contact with the existing tunnel ring TR, the posture of the connecting member R is stabilized when the second segment main body S2 is pushed. Therefore, inconveniences such as the connector R being twisted inside the first dovetail groove portion M1 and the second dovetail groove portion M2 are unlikely to occur, and the intended fastening force can be reliably exhibited. In this case, each of the projecting members T
Is set so that the total load required for out-of-plane deformation is equal to the load required for out-of-plane deformation of the single projecting member T in the above embodiment.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an outline of a connecting portion of a tunnel segment of the present invention.

FIG. 2 is a plan view showing a connector according to the present invention.

FIG. 3 is an explanatory view showing a connection state of various segment bodies.

FIG. 4 is an explanatory view showing a projecting member that is being deformed.

FIG. 5 is an explanatory view showing details of a process of connecting a second segment main body.

FIG. 6 is a perspective view showing a tubular member.

FIG. 7 is an explanatory diagram showing the relationship between the amount of compressive deformation and the load when compressing and deforming the cylindrical member.

FIG. 8 is an explanatory diagram showing an example of a connection state when there is a manufacturing error in a connection portion.

FIG. 9 is an explanatory view showing another example of the connection state when there is a manufacturing error in the connection portion.

FIG. 10 is a perspective view showing an outline of a connecting portion of a tunnel segment according to the related art.

FIG. 11 is a cross-sectional view showing details of a connecting portion of a tunnel segment according to the related art.

[Explanation of symbols]

 S1 1st segment main body S2 2nd segment main body 4 Butt part M1 Back side dovetail part M2 Front side dovetail part R Connecting tool R1 Back side connecting tool R2 Front side connecting tool T Projecting member X Tunnel circumferential direction Y Tunnel longitudinal direction Z Pushing Direction TR Tunnel ring a A segment body b B segment body c C segment body

Claims (3)

[Claims] 1. A first segment main body (S1) already constructed in order to construct a tunnel wall by pulling and connecting a plurality of tunnel segment main bodies in a tunnel circumferential direction (X) using a coupling tool (R). For the second segment body (S2)
Of the first and second segment bodies (S1, S2) to connect the first and second segment bodies (S1, S2) to each other by pushing the first and second segment main bodies (S1, S2) along the longitudinal direction (Y) of the tunnel from the near side to the far side. ) Are provided at the ends along the tunnel circumferential direction (X), and a back dovetail groove (M1) is formed at the back end of each of the butting portions (4), and the respective butting portions (M1) are formed. 4) forming a near-side dovetail groove (M2) at the near-side end, and a far-side connector (R1) at the far-side dovetail (M1) of the first segment body (S1); The front dovetail portion (M) of the second segment body (S2)
2) also includes a near-side connecting tool (R2), and when the second segment main body (S2) is pushed in, the rear dovetail groove portion of the second segment main body (S2) with respect to the far-side connecting tool (R2). (M1), and the front dovetail portion (M1) of the first segment body (S1).
A connecting portion of a tunnel segment configured so that the front side connecting tool (R2) can be simultaneously pushed into 2). 2. A protruding member (T) that can be deformed when receiving a load equal to or more than a predetermined value along the pushing direction (Z) when pushing the second segment body (S2) into the far side.
The connecting portion for a tunnel segment according to claim 1, wherein the connecting portion is provided at a rear end portion in a pushing direction (Z) of the rear connecting device (R2) and the front connecting device (R1). 3. A tunnel ring (TR) is sequentially assembled while connecting a plurality of tunnel segment bodies in a tunnel circumferential direction (X) using a connecting tool (R) to form a tunnel wall. The A segment body (a) to be attached first in the direction (X) and the A segment body (a) sandwiched between the A segment body (a) in the tunnel circumferential direction (X) in order.
Tunnel longitudinal direction (Y) with respect to segment body (a)
A B-segment body (b) connected to the back side while being pushed along the rear, and a C-segment body (c) finally pushed and connected between the two adjacent B-segment bodies (b) leaving a gap. Each of the A, B, and C segment bodies is provided with a butt portion (4) at each end in the circumferential direction of the tunnel (X) for connecting the adjacent body to each other. Has a rear dovetail groove (M1) formed at the rear end and a front dovetail groove (M2) formed at the front end. The A segment body (a) A connecting tool (R) is provided at the back side dovetail portion (M1) at both ends, and the B segment body (b) is provided with a butting portion (4) connected to the existing segment body. Butt groove on the front side (M2) and the other end (4) A coupling tool (R) is provided with the dovetail groove part (M1), and the C segment body (c) is provided with a coupling tool (R) on the front dovetail groove part (M2) at both ends. ) A unit for forming a tunnel ring.