JP3405902B2 - Connection structure of tunnel segment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention faces abutting portions of a first segment main body and a second segment main body, which are assembled adjacent to each other in the circumferential direction of the tunnel, in a state where the both butting portions are abutted. As described above, each of the first dovetail groove portion and the second dovetail groove portion is provided with a connecting tool provided with an enlarged edge portion that can be individually fitted from the tunnel axial center end portion on each side. The present invention relates to a connecting portion structure of a tunnel segment for connecting the abutting portions so that they are relatively close to each other as they are fitted into the first dovetail groove portion and the second dovetail groove portion.

[0002]

2. Description of the Related Art Conventionally, when connecting a first segment main body and a second segment main body using the above-mentioned connecting tool, the second segment main body of the second segment main body is connected to the connecting tool attached to the first dovetail groove. In order to insert the dovetail groove surely, it was necessary to accurately align the second segment body. In particular, regarding the alignment of the second dovetail groove portion on the existing segment body side, it was necessary to visually recognize the position of the second dovetail groove portion from the gap between the existing segment body and the second segment body.

[0003]

However, the above-described conventional connecting structure for tunnel segments has the following problems. That is, since the connecting tool and the second dovetail groove portion need to have a function of fastening the first segment main body and the second segment main body, there is not much difference in size between them. Therefore, if the alignment of the second segment main body is not ensured, when the second segment main body is pressed against the existing segment main body,
There is a risk of damaging the side surfaces of the connector and the second segment body. However, the position alignment work of the second segment body is mainly a position adjustment in the thickness direction of the segment body, and the vicinity of the second dovetail groove portion can be directly visually recognized from the working space on the inner side of the tunnel. Have difficulty. Therefore, the connecting member and the second dovetail groove portion are formed by a technique such that the tunnel inner side surface of the second segment body is substantially flush with the tunnel inner side surface of the already constructed first segment body. I had confirmed that the alignment was completed. However, even in this case, the first segment body and the second segment body must be kept flush with each other while the second segment body is being pressed against the existing segment body side. The pressing work was complicated.

An object of the present invention is to eliminate the drawbacks of the prior art and to provide a tunnel segment connecting portion structure capable of facilitating the pressing operation of the second segment body.

[0005]

(Structure 1) According to the structure of the connecting portion of the tunnel segment of the present invention, as described in claim 1, the second segment body is connected to the previously constructed first segment body. In doing so, the second segment is attached to the first butting surface of the first segment body.
After bringing the second butting surface of the segment body close to each other, the second segment body is pressed in a direction substantially the same as the longitudinal direction of the tunnel, whereby the second dovetail groove portion is pressed against the second dovetail groove portion.
In order to align the dovetail groove portion, the mutually engageable groove portion and the convex portion are distributed to the first butting surface and the second butting surface, and the groove portion and the convex portion are provided in the tunnel longitudinal direction.
The second segment body to be pressed in substantially the same direction as
However, the enlarged edge portion is previously fitted into the first dovetail groove portion.
Before abutting against the connecting tool,
It is characterized in that it is arranged in a positional relationship that ends the alignment of cattle . (Operation / Effect) With this configuration, for example, if the protrusion provided on the second segment body side is aligned with the groove provided on the first segment body side, the second segment body The first segment body and the second segment body do not shift in the radial direction of the tunnel while the is pressed against the existing segment body. Therefore, when the second segment body is pressed, the first dovetail groove portion and the second dovetail groove portion are aligned with each other without strictly maintaining the relative position of the second segment body with respect to the first segment body, and further, The connecting work between the 1-segment main body and the second segment main body can be performed quickly and reliably. Also, the first dovetail groove and the second dovetail
As a result of ensuring the alignment with the dovetail groove, for example, even when the first dovetail groove is preliminarily attached with the connector, the connector and the second dovetail groove can be smoothly inserted, so the connector is There is no inconvenience such as damage to the end surface of the second segment body or damage to the end surface of the second segment body.

(Structure 2) In the tunnel segment connecting portion structure of the present invention, as described in claim 2, among the both end portions of the groove portion, the end portion on the side where the guide of the convex portion is started is The first abutting surface can be formed by opening at least one of the inner edge portion of the tunnel and the edge portion of the face face. (Operation / Effect) With this configuration, when the first segment main body is brought close to the second segment main body, it is easy to visually recognize the groove portion from the inside of the tunnel, and therefore the alignment of the convex portion with the groove portion can be performed. It will be easy. In addition, when the second segment main body is brought close to the first segment main body, it is natural to perform from the tunnel inner side toward the tunnel outer side,
If you open the groove on the inner edge of the tunnel,
In addition, there is no hindrance to the proximity operation, and at the time of aligning the convex portion with the groove portion, the alignment of the second segment main body is substantially completed,
The work of connecting the second segment bodies can be made extremely efficient.

(Structure 3) In the tunnel segment connecting portion structure of the present invention, as described in claim 3, in the groove portion, in the vicinity of the end portion on the side where the guide of the convex portion is started, the width of the groove portion is formed. Can be made wider toward the inner edge of the tunnel or the edge closer to the face. (Operation / Effect) With this configuration, the range in which the second segment main body should be positioned when the protrusion is aligned with the groove is widened, so that the connecting work of the second segment main body can be further simplified. it can.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (Outline) FIG. 1 shows an outline of a tunnel segment connecting structure according to the present invention. The connection structure of the tunnel segment of the present invention is such that, when connecting the second segment body S2 to the existing segment body S and the first segment body S1, the second segment body S2 is simply connected to the side of the existing segment body S. The segment main bodies S1 and S2 are connected to each other only by pressing. For that purpose, as shown in FIG. 1, among the side surfaces of the first segment main body S1 and the second segment main body S2, the groove portion 1 or the convex portion 2 is provided on the surface parallel to the longitudinal direction of the tunnel. In this case, the side surface of the first segment body S1 is referred to as a first butting surface F1, and the side surface of the second segment body S2 is referred to as a second butting surface F2. As shown in FIG. 1, for example, with respect to the first butting surface F1,
The groove portion 1 and the convex portion 2 are provided separately from each other in the longitudinal direction X of the tunnel. In this case, the second butting face F2 on the other side has the first butting face F1 and the second butting face F2.
The groove portion 1 and the convex portion 2 are arranged such that the groove portion 1 and the convex portion 2 are combined with each other when the butting surface F2 is brought into contact with each other. As shown in FIG. 1, the extending direction of the groove portion 1 is basically along the tunnel longitudinal direction X. This is because by making the extending direction of the groove portion 1 coincide with the pressing direction of the jack or the like of the tunnel shield that presses the second segment main body S2, the pressing work of the second segment main body S2 can be performed most smoothly. is there.

The cross-sectional shapes of the groove 1 and the protrusion 2 are shown in FIG.
Shown in. In FIG. 2, these cross-sectional shapes are trapezoidal. With this configuration, when the first butting face F1 and the second butting face F2 are brought close to each other, the two can be easily engaged even if they are slightly displaced in the tunnel radial direction Y. Is good. Of course, these shapes are not limited to trapezoidal shapes, but may be hemispherical shapes or other shapes. The point is that they can be easily engaged with each other, and when the second segment body S2 is pressed in the tunnel longitudinal direction X, the approximate positions of the first segment body S1 and the second segment body S2 in the tunnel radial direction Y. Any configuration may be used as long as the relationship can be maintained. The convex portion 2 can be formed, for example, as a member having a male screw portion 2A and screwed into a female screw portion 2B formed on the second butting surface F2. On the other hand, the groove portion 1 is formed by grinding the first butting surface F1 or
It can be formed appropriately according to the type of segment, such as being formed by casting at the time of casting. The tunnel segment connecting portion structure according to the present invention can be applied to a ductile segment, a concrete segment, a steel segment, or the like.

(Structure of convex portion and groove portion and connection mode)
FIG. 3 and FIG. 4 show a configuration example of one segment ring SR formed continuously in the tunnel circumferential direction Z. Figure 3
FIG. 1 is an example of a sectional view of a tunnel peripheral wall constructed using a tunnel segment according to the present invention. Here, S
One segment ring SR is configured by using six types of segment bodies of a, Sb, Sc, Sd, Se, and Sk. Among these, Sk particularly indicates a so-called key segment body. FIG. 4 shows a plan view of each segment body. In addition, these show the state viewed from the inside of the tunnel. As shown in FIG. 4, the method of providing the groove portion 1 or the convex portion 2 on each segment main body is different. For example, in each segment main body such as Sa, Sb, Sc, etc., one groove portion 1 and one convex portion 2 are provided for each butting surface. On the other hand, in the key segment main body Sk, only the convex portion 2 is provided on both abutting surfaces. The difference between these configurations is
This is due to the difference in the way each segment body is assembled. For example, the shapes of the groove portion 1 and the convex portion 2 provided on the segment bodies Sa, Sb, Sc and the like are as shown in FIG. 1, and particularly, the shape of the groove portion 1 is a substantially linear shape. In this case, when the convex portion 2 of the second segment body S2 is brought closer to the groove portion 1 of the first segment body S1, the second segment body S2 can be brought closer from the tunnel circumferential direction Z. That is, the second segment body S
When 2 is Sa, Sb, Sc or the like, the segment ring SR is not yet completed, and therefore the second segment body S2 can be moved in the tunnel circumferential direction Z. Therefore, even if the shape of the groove portion 1 is as shown in FIG. 1, the groove portion 1 and the convex portion 2 can be easily engaged with each other.

However, when the second segment body S2 is the key segment body Sk, the use of the linear groove portion 1 may hinder the assembly of the key segment body Sk. In other words, the key segment body Sk is composed of one segment ring SR continuous in the tunnel circumferential direction Z.
When the key segment main body Sk is assembled in a predetermined position, it is inserted at the end when the key segment main body Sk is assembled, and is often inserted and attached between the already constructed segment main bodies on both sides. Tunnel circumference Z
This will limit the movement to the. Therefore, when the second segment main body S2 is the key segment main body Sk, the groove portion 1 and the convex portion 2 provided on the second abutting surface F2 of the second segment main body S2 and the first abutting surface F1 of the first segment main body S1. Can be configured as shown in FIG. 5, for example. In this case, the shape of the groove 1 is particularly characteristic. That is, of both end portions of the groove portion 1, the end portion on the side where the guide of the convex portion 2 is started is at least one of the tunnel inner side edge portion 3 and the face side edge portion 4 of the first butting surface F1. Leave it open in the section. Further, in the vicinity of the open end of the groove portion 1, the groove portion 1
Is formed so as to be wider toward the inner edge 3 of the tunnel or the edge 4 of the face. On the other hand, the convex portion 2 provided on the second butting surface F2 of the second segment body S2 is the same as that described above. Moreover, as shown in FIG. 6, these configurations are the same between the segment main body Se which is the first segment main body S1 on the opposite side.

FIG. 7 to FIG. 10 show a coupling mode particularly when the second segment body S2 is the key segment body Sk. First, the second segment body S2 is positioned in the space on the inner side of the tunnel so that the opening of the groove 1 and the position of the protrusion 2 are substantially aligned in the tunnel radial direction Y, and then the groove is formed. 1, so that the convex portion 2 is brought closer to the second segment body S2.
Is gradually moved outward in the radial direction Y of the tunnel. The groove portion 1 extends from the inside edge portion 3 of the tunnel to a substantially central position in the thickness direction and then extends toward the existing segment body S along the tunnel longitudinal direction X. The movement of S2 is performed until the convex portion 2 is inserted into the groove portion 1 and comes into contact with the side surface 1A of the groove portion 1 on the outer side of the tunnel. This state is shown in FIG. Next, when the second segment body S2 is pressed against the existing segment body S, the convex portion 2 is guided along the inclined portion 1B of the groove portion 1, and the second segment body S2 is the existing segment body. It is moved to the outside of the tunnel on the side of S. This state is shown in FIG.
The second segment body S2 is pressed by using a jack or the like provided on the tunnel shield. After that, when the convex portion 2 passes through the inclined portion 1B and reaches the straight portion 1C of the groove portion 1, the second segment body S2 is moved to the first segment.
It is set at the same position as the segment body S1 in the thickness direction. This state is shown in FIG. Further, by pressing the second segment body S2 against the existing segment body S, the second segment body S2 is maintained in the same positional relationship in the thickness direction as the first segment body S1 and the existing segment body S is maintained. Move to. Therefore, the first dovetail groove portion 1 of the first segment body S1
Even when the connecting tool is already inserted in the above, the second dovetail groove portion 1 of the second segment body S2 and the connecting tool R can be reliably inserted. FIG. 10 shows a state in which the connection is completed.

(Structure of Connecting Tool) The first segment main body S1 and the second segment main body S2 are fastened by using a connecting tool R as shown in FIG. The overall shape of the connecting tool R is substantially rectangular, and enlarged edge portions 5 are formed at both edges along the insertion direction of the connecting tool R. Clamping portions 5A and 5A are formed in portions of the two enlarged edge portions 5 that face each other, respectively. The sandwiching part 5
As shown in FIG. 13, A and 5A connect the connecting tool R to
The first dovetail groove M1 and the second dovetail groove M1 of the first segment body S1
When inserted into the second dovetail groove M2 of the segment main body S2, the segment main body S2 comes into contact with the first clamped portion 6 and the second clamped portion 7 formed in the respective dovetail grooves M1 and M2, and the first segment body S1. And to attract the second segment body S2. The two sandwiching parts 5A, 5A
Are non-parallel to each other, and are formed to have a tapered shape that widens toward the rear side in the insertion direction of the connecting tool R. According to this configuration, the first segment body S1 and the second segment body S1
Since the fastening force for connecting the segment body S2 is borne by the entire connecting tool R in the longitudinal direction, a large fastening force can be generated while having a compact structure. However, it is not necessary to configure both of the two sandwiching portions 5A and 5A in a taper shape with respect to the inserting direction of the connecting tool R. In short, it suffices that the distance between the two sandwiching portions 5A, 5A widens toward the rear side in the insertion direction of the connecting tool R. For example, even when the extending direction of the one holding portion 5A is configured to be parallel to the inserting direction of the connecting tool R, a large fastening force can be generated as described above.

When the tunnel segment connecting structure of the present invention is used, for example, the connecting tool R is first inserted into the first dovetail groove M1 of the first segment body S1 in advance.
The segment body S1 is constructed. In this state, half of the connecting tool R is the first segment of the first segment body S1.
It projects from the abutting face F1. Then, by pushing the second segment main body S2 toward the existing segment main body S, the second dovetail groove M2 provided in the second segment main body S2 and the connecting tool R are engaged, and the connecting tool R is enlarged. The slanting sandwiching portions 5A formed on the edge portion 5 attract the first dovetail groove portion M1 of the first segment body S1 and the second dovetail groove portion M2 of the second segment body S2 to connect the second segment body S2. Done. In order to ensure the insertion of the connecting tool R and the second dovetail groove M2, it is necessary to pay attention to the shape of the groove 1. That is, the alignment between the first segment body S1 and the second segment body S2 must be completed before the connecting tool R and the second dovetail groove M2 are inserted. That is, when the groove portion 1 has a linear shape as in the embodiment of FIG. 1, the connecting member R has a pressing direction front side with respect to the standby position,
That is, the groove portion 1 is formed up to the front side of the first dovetail groove portion M1, and the pressing direction side end portion of the second segment body S2 contacts the first segment body S1 before coming into contact with the connector R. It is configured to finish the alignment with the second segment body S2. On the other hand, in the case of the embodiment shown in FIG. 5, the convex portion 2 on the second segment body S2 side is the first
The groove portion 1 is configured such that the pressing direction side end portion of the second segment body S2 is not in contact with the connecting tool R at the stage of reaching the straight portion of the groove portion 1 on the segment body S1 side. .

In order to make the fastening force between the first segment main body S1 and the second segment main body S2 substantially constant, as shown in FIG. 11, the projecting portion which is deformed by receiving a constant load on the end of the connector. Should be provided. The protrusion T is composed of a hollow cylindrical member 8, and the protrusion T is fitted and fixed in a recess 9 provided at the rear end of the connector R, for example. When the second segment main body S2 is pressed against the existing segment main body S, the protrusion T is used to form the second segment main body S.
It is pushed by the second second dovetail groove M2 and comes into contact with the existing segment main body S, and receives a predetermined compressive force to be deformed by compression. A flange 10 is provided at least at the center of the cylindrical member 8 in the pressing direction. With this configuration, the shapes of the parts on both sides of the collar 10 are small in the aspect ratio in the pressing direction. Therefore, the cylindrical member 8 as a whole can be elongated, but can be contracted and deformed in the pressing direction without being bent during the pressing.

(Connecting operation of connecting tool) The connecting process of the first segment main body S1 and the second segment main body S2 using the connecting tool R will be described with reference to FIGS.
Shown in (d). FIG. 12 shows an outline of the case where the second segment body S2 is brought close to the first segment body S1. FIG. 13A shows the first segment body S1 that has already been constructed and the first segment body S1.
The process of bringing the second segment main body S2 close to the connector R inserted in the first dovetail groove M1 is shown. In this process, the connecting tool R and the second segment body S2 are not yet in contact with each other. The pressing of the second segment body S2 proceeds, and the second dovetail groove M
FIG. 13B shows a state in which 2 is in contact with the enlarged edge portion 5 of the connecting tool R. Further, when the second segment body S2 is pushed toward the existing segment body S,
Sliding occurs between the first dovetail groove portion M1 and the enlarged edge portion 5, and the connector R has the first dovetail groove portion M until the tip of the protruding portion T of the connecting tool R abuts the existing segment body S.
Slide along 1. Due to this sliding, there is a margin in the width of the part of the body portion 11 of the connecting tool R that protrudes from the first segment body S1, so that the second segment body S2 is located closer to the existing segment body S. It is possible to break in. FIG. 13C shows the connecting tool R that has slid.
Is a state in which the tip of the protruding portion T is in contact with the existing segment body S. Next, the second segment body S2
When is pushed in, the second segment body S2 further penetrates, and the contact force between the first segment body S1 and the second segment body S2 increases. However, at this stage, compressive deformation does not occur in the protrusion T. That is, since both of the enlarged edges 5 are formed in a tapered shape,
Most of the force that presses the second segment body S2 toward the existing segment body S is determined by the two segment bodies S.
It becomes a component force for attracting S1 and S2. For this reason, the component force for pressing the connecting tool R toward the existing segment body S has not yet increased to the force necessary for compressively deforming the projecting portion T. When the component force that pushes the second segment body S2 further and presses the connecting tool R toward the existing segment body S increases to the extent that the protrusion T can be compressed and deformed, the protrusion T is compressed and deformed. Occurs, and then out-of-plane deformation occurs, so that the connector R moves to the existing segment body S side. As a result, since the connecting tool R moves to the side where the width of the flat groove portion M1b related to the first dovetail groove portion M1 is narrow, there is a margin in the space between the two enlarged edge portions 5 and the second segment body S.
2 further invades. In this state, the attraction force between the first segment body S1 and the second segment body S2 is kept substantially constant. In the connecting structure of the present invention, this attractive force can be easily set. That is, by appropriately changing the inclination angles of the enlarged edge portion 5 and the dovetail groove portion 1 and appropriately setting the load when the protruding portion T receives a compressive force and is compressed and deformed in the axial direction, The attraction force of R can be set. The load required for the compressive deformation of the protruding portion T can be set by appropriately changing the material and wall thickness of the cylindrical member 8 or the slenderness ratio in the compression direction. As the material of the cylindrical member 8, a material that is relatively easily deformed, such as aluminum, copper, lead, or thin steel material, can be used. That is, since plastic deformation performance is stable with these materials, the protrusion T having a desired deformability can be easily obtained. In addition, as shown in FIG. 13, the collar portion 10 is provided at the center.
By using the protruding portion T provided with, the two cylindrical members 8 are connected to each other, and it is possible to secure a long deformation stroke during compression deformation while generating a constant deformation resistance. As a result, even when the connecting tool R has a relatively large manufacturing error, it is possible to fasten the connecting tool R in a wide range of positions along the longitudinal direction of the dovetail grooves M1 and M2, and to obtain a substantially constant pulling force. The segment bodies S1 and S2 can be connected to each other by applying force.

FIG. 13D shows a state in which the second segment body S2 further pushed into the existing segment body S is thereafter in contact with the existing segment body S. That is, this is a state in which the connection of the second segment main body S2 is completed.

As described above, by using the connecting tool R having the projecting portion, for example, the flat groove portions M1b and M2 of the both sides can be used.
Even when the total width of b is narrower than the distance between the sandwiching portions of the connecting tool R, the connecting tool R can be reliably positioned inside the first and second dovetail grooves M1 and M2 on both sides. Therefore, it is possible to prevent the inconvenience of being left unattended inside the first and second dovetail grooves M1 and M2. Moreover, when the connector R of the present invention is used, the manufacturing error of the first and second dovetail grooves M1 and M2 or the connector R itself is allowed within a certain range while the first and second dovetail grooves M1 and M2 are manufactured.
The second segment bodies S1 and S2 may be connected to each other with a substantially constant fastening force.

(Other Embodiment) In the connecting structure of the key segment main body Sk shown in FIG. 5, the opening direction of the groove portion 1 is set to the inside of the tunnel or the face of the tunnel shield. This is because the seal member 1 is provided on the outer side of the tunnel among the side surfaces of the segment main body in order to enhance the waterproofness between the segment main bodies.
This is because it is provided with 2. That is, with the configuration of FIG. 5, the seal member 12 can be provided around the segment main body without being divided. However, when connecting the segment main bodies without the seal member 12 as described above, the groove portion 1 may be provided on the side of the key segment main body Sk as shown in FIG. That is, the convex portion 2 is provided on the first segment main body S1 side, and the groove portion 1 is provided on the key segment main body Sk side which is the second segment main body S2. In this case, of the end portions of the groove portion 1, the end portion on the side where the guide of the convex portion 2 is started can be provided on the outer side of the tunnel or on the side opposite to the cutting edge of the tunnel shield. In this case, the groove portion 1 and the convex portion 2 have the first butting surface F1.
And at the second butting surface F2, the first dovetail groove M
1 or on the outer side of the tunnel with respect to the second dovetail groove M2. In the description of the claims, reference numerals are given to refer to the drawings and to facilitate the comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an outline of a connecting portion structure of a tunnel segment according to the present invention.

FIG. 2 is a vertical cross-sectional view showing the shapes of a groove and a protrusion.

FIG. 3 is an explanatory diagram showing a configuration example of a tunnel ring.

FIG. 4 is a plan view showing the shape of each segment body forming the tunnel ring.

FIG. 5 is an explanatory view showing an outline of a connecting portion structure of the second segment main body.

FIG. 6 is an explanatory view showing a connection mode of the second segment main body.

FIG. 7 is an explanatory view showing a connecting process of the second segment main body.

FIG. 8 is an explanatory view showing a connecting process of the second segment main body.

FIG. 9 is an explanatory view showing a connecting process of the second segment main body.

FIG. 10 is an explanatory view showing a connecting process of the second segment main body.

FIG. 11 is a plan view of the connector.

FIG. 12 is a plan view showing a process of connecting the second segment main body.

FIG. 13 is an explanatory view showing a connecting process of the first and second segment main bodies by a connecting tool.

FIG. 14 is an explanatory diagram showing an outline of a connecting portion structure of a tunnel segment according to another embodiment.

[Explanation of symbols]

1 groove 1 2 convex part 2 3 Inside edge of tunnel 4 Face edge 5 enlarged edge F1 first butt surface F2 Second butting surface M1 1st dovetail groove 1 M2 2nd dovetail groove 1 S1 First segment body S1 S2 Second segment body S2 R connector

Front page continuation (72) Inventor Yukihiko Ishikawa 3-19-6 Higashi-Ueno, Taito-ku, Tokyo Inside the Imperial High Speed Traffic Corps (72) Inventor Ken Watanabe 4-213 Shimodoya, Hoya-shi, Tokyo ( 72) Inventor Yoshihiko Matsui, 2-10-10 Fujimi, Chiyoda-ku, Tokyo, Maeda Construction Industry Co., Ltd. (72) Inventor, Hiroshi Sato 1-1-1, Hama, Amagasaki City, Hyogo Prefecture Kubota Technology Development Laboratory (72) ) Inventor Katsuhiko Mukano 1-1-1, Hama, Amagasaki-shi, Hyogo Inside Kubota Technology Development Laboratory Co., Ltd. (56) References JP-A-6-299796 (JP, A) JP-A-7-76995 (JP, A) JP-A-8-246798 (JP, A) JP-A-8-4487 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/04 E21D 11/08

Claims (3)

(57) [Claims] 1. A butt section of a first segment main body (S1) and a butt section of a second segment main body (S2) assembled adjacent to each other in the tunnel circumferential direction, facing each other with both butt sections abutting each other. As described above, each of the first dovetail groove portion (M1) and the second dovetail groove portion (M2) provided separately is provided with an enlarged edge portion (5) that can be individually inserted from the tunnel axial direction end portion on both sides. As the connecting tool (R) is fitted into the first dovetail groove portion (M1) and the second dovetail groove portion (M2) with the respective enlarged edges (5), the both butting portions are relatively close to each other. A connecting portion structure of a tunnel segment to be connected, wherein when connecting the second segment body (S2) to the previously constructed first segment body (S1), the first segment body (S1) First butt surface (F
1) to the second segment body (S2) of the second
After bringing the abutting faces (F2) close to each other, the second segment main body (S2) is pressed in substantially the same direction as the tunnel longitudinal direction (X), whereby the second dovetail groove (M1) is pressed against the second dovetail groove (M1). To align the groove (M2),
A groove portion (1) and a convex portion (2) that can be fitted to each other are provided separately for the first butting surface (F1) and the second butting surface (F2), and the groove portion (1) and the convex portion are provided . Part (2) is
The above-mentioned No. 1 which is pressed in substantially the same direction as the tunnel longitudinal direction (X)
The two-segment main body (S2) is previously the first dovetail groove portion.
The connector in which the enlarged edge portion (5) is fitted in (M1)
Before contacting (R), both segment bodies (S
1, S2) are arranged in a positional relationship that completes the alignment between them.
The structure of the connecting parts of the tunnel segments that are placed . 2. The end of the groove (1) on the side where the projection of the convex portion (2) starts to be guided is a tunnel inner side edge (3) of the first butting surface (F1). ) Or the connecting portion structure of the tunnel segment according to claim 1, which is open at at least one edge of the face side edge (4). 3. The convex portion (2) of the groove portion (1)
In the vicinity of the end on the side where the guide starts, the width of the groove (1) is such that the inside edge of the tunnel (3)
Alternatively, the connecting portion structure of the tunnel segment according to any one of claims 1 and 2, wherein the connecting portion structure is formed so as to be wider toward the edge portion (4) on the face side.