JP3363053B2 - Segment connection tool for tunnel - 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, with respect to the first dovetail groove portion and the second dovetail groove portion, which are separately provided, on both sides of the tunnel edge in the axial direction of the tunnel, respectively, there are provided enlarged edge portions that can be individually fitted, and each of the enlarged edge portions is provided with the first edge portion. The present invention relates to a tunnel segment connector in which a sandwiching portion that brings the abutting portions relatively close to each other as they are fitted into the dovetail groove portion and the second dovetail groove portion is provided at each enlarged edge portion.

[0002]

2. Description of the Related Art Conventionally, this type of segment connecting device for tunnels (hereinafter referred to as "connecting device") has been used for connecting two tunnel segment main bodies which are adjacent to each other in the tunnel circumferential direction. That is, when sequentially connecting the tunnel segment bodies to the annular segment ring that has already been constructed in the tunnel circumferential direction, the coupling is performed to attract and couple the segment bodies that are adjacent to each other in the tunnel circumferential direction. Use ingredients. Of the two tunnel segment main bodies that are adjacent to each other in the circumferential direction of the tunnel, the one that is attached first is the first segment main body and the one that is attached later is the second
A segment body is used, and a segment that is already constructed and that abuts the first segment body and the second segment body is an existing segment body. There are a so-called pre-attached method and a post-attached method as a method of connecting the segment main bodies using the connecting tool. In the pre-attachment method, one of the enlarged edge portions of the connector is previously inserted into the dovetail groove portion of the first segment main body from the side of the existing segment main body, and the first segment main body is tunneled in this state. It is connected to the existing segment body from the axial direction. The second segment main body is configured so that the dovetail groove portion of the second segment main body fits into the connector in a state where the abutting portion of the second segment main body and the abutting portion of the first segment main body are close to each other. Is pressed against the side of the existing segment body to connect them. That is, the connector is inserted from the side of the existing segment main body toward the first segment main body and the second segment main body to attract and connect the first segment main body and the second segment main body. It has become. In the retrofitting method, the connector is inserted from the width center side of the first segment body and the second segment body in the tunnel axis direction toward the existing segment body. In this case, a working space for inserting the connector is formed in advance at the abutting portion between the first segment body and the second segment body. In this case, a step in which the second segment main body is pressed toward the existing segment main body side while the second segment main body is brought close to the first segment main body that has been connected, and the pressing is substantially finished with respect to the existing segment main body. Then, the connector is temporarily inserted from the working space. The connector is temporarily inserted in a state where it extends over the dovetail groove portion of the first segment body and the dovetail groove portion of the second segment body. Then, the connecting tool is press-fitted using a pushing device or the like.

[0003]

However, according to the above-mentioned conventional connecting method using the connecting tool, there are the following problems. In the case of the pre-applied method, it is difficult to reliably generate a predetermined attractive force. That is, when the second segment main body is pressed against the existing segment main body, the connecting tool is in contact with the existing segment main body, and when the second segment main body is completely pushed, The first segment main body, the second segment main body, and the connector are all in contact with the existing segment main body. In the case of this configuration, it is desirable that the distance between the dovetail groove portion of the first segment main body and the dovetail groove portion of the second segment main body and the distance between the enlarged edge portions of the connector be the same, Some error will usually occur. In particular, when the distance between the enlarged edges is too wide, the first segment main body and the second segment main body cannot be sufficiently attracted. It is also difficult to measure the attraction force after the second segment body is attached. On the other hand, in the case of the retrofitting method, it was possible to set the attraction force between the first segment main body and the second segment main body by controlling the pushing force of the connecting tool. But,
A recess for inserting the connector must be formed at a butting portion between the first segment body and the second segment body. For this reason, the contact area of both segment main bodies at the abutting portion is reduced, the degree of connection at the abutting portion becomes insufficient, and there is a risk that groundwater may leak from the portion. In addition, the shape of the segment main body is complicated and it takes time to manufacture, and a special connector pushing device is required for the connecting work. As described above, there are various inconveniences in the connection system using the above-described conventional connection tool, and there is still room for improvement. The object of the present invention is to solve the drawbacks of the prior art, to improve the efficiency of the connection work of each of the two segment main bodies that are connected in the tunnel circumferential direction, and to improve the reliability of the connection portion. To provide the ingredients.

[0004]

[Means for Solving the Problems]

(Structure 1) A characteristic structure of a tunnel segment connector according to the present invention for achieving this object is, as described in claim 1, that an existing segment main body adjacent to the tunnel axis direction is provided at the rear end in the fitting direction. The point is that a protruding portion that can be brought into contact with is provided, and the tip end portion of the protruding portion is configured to be able to retract when a load of a predetermined amount or more is applied from the existing segment main body. (Operation / Effect) According to the tunnel segment connector having the protrusion as in the present configuration, when the second segment main body is pressed against the existing segment main body, the second segment main body is pressed. It is possible to set the contact start position between the second connector body and the connection tool on the front side in the insertion direction of the second segment body. From the viewpoint of the coupling tool, the contact start position can be set on the inner side in the insertion direction of the dovetail groove of the first segment body. Providing the protrusion on the connector as in the present invention allows the dovetail groove portion of the first segment body and the second segment body to be sandwiched, as compared with the interval between the two enlarged edges of the connector. This is effective when the total width of the member dimensions is too small. For example, when there is such a dimensional relationship between the connectors and the like, and when a conventional connector is used, the connectors are rattled inside both dovetail grooves after the construction of both segment main bodies is completed. There is a risk of being stuck. This is because the connector is pushed by the second segment main body and moves toward the existing segment main body before the predetermined fastening force is generated by the connector. The connector of this configuration temporarily stops at the position where the protrusion contacts the existing segment body when being pushed by the second segment body. In this state, the second segment body is not yet in contact with the existing segment body, and the second segment body needs to be further pushed. Then, when the second segment main body is pushed in and the pressing force by the second segment main body exceeds the force necessary for retracting the protrusion, the connector absorbs the dimensional error of the dovetail groove and the like. Therefore, the movement starts again to the side of the existing segment. Thus, according to the tunnel segment connector of the present invention, it is possible to connect the segment bodies with a substantially constant fastening force while allowing a manufacturing error of the dovetail groove or the connector itself to a certain range. it can. Therefore, as compared with the case of using the conventional connecting tool in which the manufacturing error of the connecting portion is hardly allowed, in the case of using the connecting tool of the present invention, a great efficiency is achieved in the overall connecting work between the segment main bodies. At the same time, the reliability of the connecting portion can be significantly improved.

(Structure 2) In the tunnel segment connector of the present invention, as described in claim 2,
Of the two enlarged edges, the enlarged edges are configured to be continuous surfaces along the extending direction of the enlarged edges with respect to each other, and the interval between the sandwiching portions is set to the enlarged edge. It can be configured to be wider toward the rear side in the fitting direction. (Operation / Effect) According to this configuration, the fastening force for connecting the first segment main body S1 and the second segment main body S2 is borne by the entire connecting tool R in the longitudinal direction, so that a compact configuration is achieved. While, it is possible to generate a large fastening force.

(Structure 3) In the tunnel segment connector of the present invention, as described in claim 3,
It can be composed of a rod-shaped member and a deformable tubular member in which a part of the rod-shaped member is fitted and held. (Operation / Effect) With this configuration, although the shape is extremely simple, the size / material of the rod-shaped member and the size / material of the tubular member are arbitrarily selected, and the rod-shaped member retreats. It is possible to easily set the load required for this.

(Structure 4) According to a fourth aspect of the present invention, there is provided a segment connecting tool for a tunnel, wherein:
It is also possible to use a hollow member having a substantially cylindrical shape. (Operation / Effect) In the case of this configuration, when the tip end portion of the protruding portion receives a load of a certain amount or more when pressed from the tunnel segment main body, the protruding portion undergoes out-of-plane deformation,
By moving the tunnel segment connector to the side of the existing segment body, it is possible to obtain the action and effect described in the above configuration 1. Further, in the case of this configuration, for example, the predetermined load necessary for deformation can be easily determined by appropriately selecting the wall thickness and the length-width dimension ratio of the substantially cylindrical member.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (Connector and Dovetail Groove) FIGS. 1 and 2 show the appearance of a connector R used in the tunnel segment connecting structure of the present invention.
And an outline of the connection structure is shown in FIG. The tunnel segment connecting structure of the present invention constructs the tunnel inner wall by simply pressing the segment main body S to the connecting position to connect the segment main bodies S to each other by the connecting tool R. Therefore, it is not necessary to provide a large number of connecting bolt pockets on the inner side surface of the segment main body S that constitutes the surface on the inner space side of the tunnel, unlike the conventional segment main body, and the inner side surface has a relatively smooth surface. Configure
It is possible to omit the trouble of secondary lining. In this embodiment, as shown in FIG. 3, an example in which a ductile segment is used as a tunnel segment to be connected is shown. However, in addition to this, it is also possible to use a concrete segment or a steel segment.

The segment connecting tool R for tunnel of the present invention
For example, as shown in FIGS. 1 to 4, a protrusion T that can contact the existing segment body S is provided at the rear end in the fitting direction. As shown in FIGS. 1 and 2, the protrusion T
Is three members, that is, the rod-shaped member 1 that is in contact with the existing segment body S, and the tubular member 2 that fits and holds one end of the rod-shaped member 1 and is capable of expanding and deforming itself. The tubular member 2 is fitted and held while allowing some relative movement of the tubular member 2 with respect to the tool R, and itself is constituted by an elastic holding member 3 which is internally fitted and held in the connecting tool R. Regarding the size of the connecting tool R, for example, the length in the insertion direction is about 150 mm, and the protruding length of the projecting portion T with respect to the end portion of the connecting tool R is about 25 mm. The overall shape of the connecting tool R is substantially rectangular as shown in FIG. 2, and enlarged edges 4 are formed at both edges along the insertion direction of the connecting tool R. Clamping portions 5 and 5 are formed in portions of the two enlarged edges 4 that face each other. The sandwiching portions 5 and 5 connect the connecting tool R to each other.
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. In the case of the present embodiment, the holding portions 5 and 5 are provided with holding surfaces 5A and 5A, respectively.
The sandwiched portion 6 and the second sandwiched portion 7 have a first
A sandwiched surface 6A and a second sandwiched surface 7A are formed.
The two sandwiching surfaces 5A, 5A are non-parallel to each other, and are formed to have a tapered shape that widens toward the inner side in the insertion direction of the connecting tool R. According to this configuration, the fastening force that connects the first segment body S1 and the second segment body S2 is borne by the entire length of the connecting tool R in the longitudinal direction. Can be generated.

The taper ratio is, for example, as shown in FIG.
As shown in FIG. 5, when viewed from the sandwiching surface 5A on one side, it is about 20 to 1 with respect to the inserting direction of the connecting tool R. In FIG. 1 and FIG. 2, the protrusions T are separately provided on the respective enlarged edge portions 4, but the number of protrusion portions T is not limited to two, and one protrusion portion T is provided at an intermediate position between the enlarged edge portions 4. The structure may be provided only at the location. As will be described later, the structure is arbitrary as long as it retreats to the connecting tool R side when a predetermined load is applied.

(Connecting operation) Using the connecting tool R, the first segment main body S1 and the second segment main body S are connected.
The process of connecting the two is shown in FIG. 4 and FIG.
Shown in.

With respect to the existing segment body S, the first segment body S1 and the second segment body S
When attaching 2, the so-called pre-attachment method in which the connecting tool R is attached to the first segment body S1 in advance is used. These attachment modes are shown in FIG. In FIG. 4, the segment bodies indicated by Sa, Sb, and Sc are the existing segment bodies S. These three segment bodies may be assembled in any order. These three existing segment bodies Sa, Sb, Sc
On the other hand, the first segment body S1 and the second segment body S2 are connected. First, the first segment body S1 is attached to the existing segment bodies Sa and Sc in a state where the connecting tool R is attached to the first dovetail groove M1 of the first segment body S1. Then, the second segment body S2 is connected to the first segment body S1 and the existing segment bodies Sa and Sb. In this case, the connecting tool R extending over the existing segment bodies Sa and Sb is
You may push in using the side surface of the segment main body S2, or before pushing in the said 2nd segment main body S2.
You may push in separately using a tool etc. This means that the second segment body S2 is replaced by the first segment body S1.
The same applies to the connector R inserted after being pressed against the existing segment bodies Sa and Sb.

FIG. 5A shows the first segment body S1 already 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 is movable inside the first dovetail groove M1. Then, the pressing of the second segment main body S2 proceeds, and the second dovetail groove M2 of the second segment main body S2 is connected to the connecting tool R.
FIG. 5 shows the state of contact with the holding surface 5A of FIG.
It is (b). From this state, when the second segment body S2 is further pressed to the existing segment body S side, slippage occurs between the first clamped surface 6A and the clamp surface 5A of the first dovetail groove M1, The connecting tool R slides along the first dovetail groove M1 until the tip of the projecting portion T contacts the existing segment body S. Along with this movement, the first sandwiched by both sandwiching surfaces 5A, 5A
Since the width of the first clamped portion 6 of the segment main body S1 is gradually reduced, the second clamped portion 7 of the second segment main body S2 intrudes between the both clamping surfaces 5A and 5A. Become. FIG. 5C shows a state in which the tip of the protruding portion T of the connecting tool R that has slid is in contact with the existing segment body S. After that, when the second segment body S2 is further pressed, the second sandwiched portion 7 is held for a while.
Slides with respect to the holding surface 5A, and the contact force between the first segment body S1 and the second segment body S2 increases. At this stage, the protrusion T does not retract into the inside of the connector R. That is, the sandwiching surface 5 of both of the above
Since A, 5A and the first and second clamped surfaces 6A, 7A are tapered surfaces, most of the force for pressing the second segment body S2 toward the existing segment body S is
It serves as a component force for attracting the two segment bodies S1 and S2. Therefore, the component force that presses the connecting tool R toward the existing segment body S has not yet increased to the force required to retract the protrusion T.
When the component force of pressing the second segment main body S2 further and pressing the connecting tool R toward the existing segment main body S increases enough to retract the protrusion T, the protrusion T starts to retract. , The connector R moves to the side of the existing segment body S. As a result, the connecting tool R
Is moved to the side where the width of the first clamped portion 6 is narrow,
There is a margin in the space between the sandwiching surfaces 5A and 5A. Then, the second clamped portion 7 of the second segment main body S2 enters the spare space. In this state, the attraction force between the first segment main body S1 and the second segment main body S2 is kept substantially constant.

Now, a situation where the protruding portion T retreats will be described. As shown in FIG. 2, the withdrawal of the protruding portion T is performed by fitting the rod-shaped member 1 into the tubular member 2 while expanding and deforming the tubular member 2. The tubular member 2 has, for example, a rear end portion thereof brought into contact with a bottom portion of a protruding portion mounting hole 8 provided in the connecting tool R,
It is configured to oppose the pressing of the rod-shaped member 1.
The elastic holding member 3 holds the tubular member 2 inside the connector R while allowing the diameter-expanding deformation of the tubular member 2. The material of the member forming the protrusion T is, for example,
The rod-shaped member 1 is made of a highly hardened steel material that is hard to be deformed, the tubular member 2 is made of a material that is relatively easily deformed, such as aluminum, copper, lead, or thin steel material, and the elastic holding member 3 is made of rubber. -It is possible to use a material that is relatively easily deformable, such as synthetic resin. The cylindrical member 2 may be plastically deformed or elastically deformed as long as it exhibits a substantially constant resistance against the pushing of the rod-shaped member 1. In the case of the connecting tool R having the above-mentioned size, the resistance force that the protrusion T should exert is, for example, about 20 t in total. That is,
In the connector R having the shape shown in the present embodiment, the one protruding portion T exerts a resistance force of about 10t. In this case, the first segment body S1 and the second segment body S2
Is to be fastened with a force of about 40t by the one connecting tool R.

FIG. 5D shows a state in which the second segment body S2 is then further pushed toward the existing segment body S and brought into contact therewith. In this state, the normal connecting process is completed. That is, a part of the rod-shaped member 1 is
The connection ends when the connection tool R is retired.

On the other hand, the total width of the first sandwiched portion 6 and the second sandwiched portion 7 is equal to the sandwiching surfaces 5A,
When the distance between the 5A is narrow, the protrusion T
Is not so retired, both segment bodies S
The connection between 1, S ends. FIG. 6 shows the protrusion T
Is a diagram showing a state in which the first and second clamped portions 6 and 7 are narrow relative to the distance between the clamp surfaces 5A and 5A on both sides. Is shown. On the contrary, FIG. 7 shows an example in which the protrusion T is completely retracted into the inside of the connecting tool R and the connection is completed. This shows an allowable limit when the total width of the first and second clamped portions 6 and 7 is wider than the distance between the clamp surfaces 5A and 5A.

In the conventional tip-end method, when the total width of the first sandwiched portion 6 and the second sandwiched portion 7 does not match the spacing between the sandwiching surfaces 5A, 5A, both segments It was impossible to properly connect the main bodies S1 and S to each other. For example, when the total width of the first clamped portion 6 and the second clamped portion 7 is narrow, the connector R
Had an inconvenience that it was left loose inside the first and second dovetail grooves M1 and M2. However, as is clear from the examples shown in FIGS. 5 to 7, if the connecting tool R of the present invention is used, the first and second dovetail grooves M can be formed.
1, M2 or the first or second segment main body S while allowing the manufacturing error of the connecting tool R itself to a certain range.
It is possible to connect 1, S2 with a substantially constant fastening force. It should be noted that the above description relates to the connecting process of the dovetail grooves M1 and M2 on the existing segment ring side among the dovetail grooves M1 and M2 of the first and second segment bodies S1 and S2. However, the other dovetail groove M
1, M2, ie, the connector R inserted into the already constructed segment ring,
Segment body S1 or the second segment body S
The operation process of the connecting tool R pushed by the side surface of the second side can be similarly understood.

(Manufacturing Tolerance of Connecting Tool) The connecting tool R
As described above, the range of manufacturing error that can be tolerated is considered to be the range between the case shown in FIG. 6 and the case shown in FIG. In order to simplify the description, it is assumed that there is no manufacturing error in the connecting tool R, and the first segment body S1
And the respective first and second of the second segment body S2
It is assumed that there is no error in the taper angles of the clamped parts 6 and 7. That is, it is assumed that the manufacturing error occurs only in the width of the first and second clamped portions 6 and 7 in each of the first segment body S1 and the second segment body S2. First, as in the example shown in FIG. 6, a case where the total width of the first and second clamped portions 6 and 7 is narrower than the distance between the clamping surfaces 5A and 5A of the connecting tool R will be examined. . In this case, regarding the interval between the sandwiching surfaces 5A and 5A, in particular, the interval at the end on the side where the protrusion T is provided is D ₀ . On the other hand, regarding the total width of the first and second clamped portions 6 and 7, the total width at the end contacting the existing segment body S is D. The difference between the total width D and the distance D ₀ can be obtained from the protrusion length of the protrusion T and the taper angle of the holding surface 5A. The protrusion length is H and the taper angle is L:
If it is set to 1, the minimum value D _min that the total width D can take is D _min = D ₀ −H × (1 / L) × 2 −. On the other hand, as in the example shown in FIG. 7, the total width D
When is wide, it can be said that the total width D is equal to the interval D ₀ . Therefore, in this case, the relationship of D _max = D ₀ − is established. Therefore, from the formula and the formula, the range in which the total width D can be taken is D ₀ −2H / L ≦ D ≦ D ₀ −. For example, the protruding length H is 25 mm, the taper angle is 20: 1, then the equation, possible value of the total width D is D ₀ -2.5mm~D _0, 2.5mm The manufacturing error of can be tolerated. As described above, when the connector R of the present invention is used, a manufacturing error of the first dovetail groove portion M1 and the second dovetail groove portion M2,
Alternatively, the manufacturing error of the connecting tool R itself can be allowed within a certain range. This is over the entire connecting work between the first and second segment bodies S1 and S2 as compared with the case of using the conventional connecting tool R in which the manufacturing error of the connecting tool R is not allowed in principle. It can be said that the efficiency of the connection can be significantly improved, and at the same time, the reliability of the connecting portion can be significantly improved.

[Other Embodiments] <1> The holding surface 5A of the connecting tool R is not limited to the one formed of a tapered surface, and the first and second held portions 6,
It is also possible to form the convex portion that can come into contact with 7 intermittently along the longitudinal direction of the enlarged edge portion 4. That is, the convex portion may be arranged in a tapered shape. <2> In the above-described embodiment, the resistance force of the protruding portion T is obtained by the diameter-expanding deformation of the tubular member 2. However, the present invention is not limited to this configuration, and for example, the configuration shown in FIG. May be. That is, a bellows-shaped member 9 formed of plastically deformable aluminum, lead or the like is inserted into the protruding portion mounting hole 8 and the member 9 is pressed by the rod-shaped member 1. The material, shape, etc. of the member 9 are not particularly limited as long as the member 9 is plastically deformed when a predetermined force or more is applied. <3> Further, the protrusion T may be the one shown in FIG. 9. That is, here, the protruding portion T is formed of the hollow cylindrical member 10, and the protruding portion T is fitted and fixed in the recessed portion 11 provided at the rear end of the connecting tool R, for example. A flange 11 is provided at the center of the cylindrical member 10 in the pressing direction.
With this configuration, the shapes of the parts on both sides of the collar 11 are small in the aspect ratio in the pressing direction. For this reason, the cylindrical member 10 as a whole can be elongated, but the cylindrical member 10 can be shrunk and deformed in the pressing direction without bending during pressing. As a result, it is possible to secure a long deformation stroke when the cylindrical member 10 is deformed out-of-plane while generating a constant deformation resistance, and there is a margin in the fastening position of the connector R with respect to the dovetail grooves M1 and M2. . Therefore, even when the dovetail grooves M1 and M2 and the connecting tool R have a relatively large manufacturing error, the manufacturing error is allowed and the segment main bodies S1 and S2 are connected to each other with a substantially constant attractive force. You can In the case of this another embodiment, for example, a predetermined load and a deformation stroke required for deformation can be obtained by appropriately selecting the wall thickness of the cylindrical member 10, the dimension ratio in the length and width, and the number of the flange portions 12 and the like. Can be easily determined. The cylindrical member 10 can be formed using a material that is relatively easily deformed, such as aluminum, copper, lead, or thin steel material. That is, these materials have stable plastic deformability, so that the protruding member T having a desired deformability can be easily obtained. The attachment of the cylindrical member 10 to the connecting tool R is not limited to the above-mentioned fitting, but an adhesive or the like may be used. <4> In the above embodiment, the overall shape of the connecting tool R is a substantially rectangular shape as shown in FIG. 2, but it is not limited to this shape. For example, as shown in FIG. 10, the outer edges of both the enlarged edge portions 4 may be formed in a parallel rectangular shape. That is, as long as the sandwiching surfaces 5A and 5A are not parallel to each other and the first dovetail groove portion M1 and the second dovetail groove portion M2 can be attracted, any shape may be used to manufacture the connector R. It may be formed in an arbitrary shape depending on the convenience of the case and the convenience of packaging when the connecting tool R is transported.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a perspective view showing the external appearance of a connector of the present invention.

FIG. 2 is a cross-sectional view showing details of a protrusion according to the connector of the present invention.

FIG. 3 is an explanatory view showing an associative relationship between the connector of the present invention and the segment body.

FIG. 4 is an explanatory view showing a process of connecting segment main bodies using the connecting tool of the present invention.

FIG. 5 is an explanatory view showing a process of connecting segment main bodies using the connecting tool of the present invention.

FIG. 6 is an explanatory view showing an example of a connected state when there is a manufacturing error in the connected portion.

FIG. 7 is an explanatory view showing another example of the connected state when there is a manufacturing error in the connected portion.

FIG. 8 is a cross-sectional view showing details of a protrusion according to another embodiment.

FIG. 9 is a cross-sectional view showing details of a protrusion according to another embodiment.

FIG. 10 is an explanatory view showing a connected state using a connecting tool according to another embodiment.

[Explanation of symbols]

1 bar-shaped member 2 tubular members 4 enlarged edge 5 clamping part 10 Substantially cylindrical member S1 First segment body S2 Second segment body S Existing segment body M1 1st dovetail groove M2 second dovetail groove T protrusion

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Konno 7-1-22 Minami-Enkajima, Taisho-ku, Osaka-shi, Osaka Kubota Co., Ltd. Inside the Onkajima plant (56) Reference JP-A-6-299796 (JP, A) JP-A-5-263594 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/04 E21D 11/08

Claims (4)

(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, with respect to each of the first dovetail groove portion (M1) and the second dovetail groove portion (M2) that are separately provided, each side is provided with an enlarged edge portion (4) that can be fitted separately from the tunnel axial direction end portion, Each enlarged edge (4) is defined by the first
Providing a sandwiching portion (5) at each enlarged edge portion (4) for making the abutting portions relatively close to each other as they are fitted into the dovetail groove portion (M1) and the second dovetail groove portion (M2). A certain segment connecting tool for tunnel, wherein a protrusion (T) capable of contacting an existing segment main body (S) adjacent in the tunnel axis direction is provided at a rear end in the fitting direction, and a tip of the protrusion (T) The segment connector for tunnel, wherein the part is configured to be able to retreat when a load of a certain amount or more is applied from the existing segment body (S). 2. The sandwiching portion (5) extends in a direction in which the respective enlarged edges (4) extend with respect to portions of the enlarged edges (4) where the enlarged edges (4) face each other. And a distance between the sandwiching portions (5) is set to the enlarged edge portion (4).
The tunnel segment connector according to claim 1, wherein the tunnel segment connector is configured to be wider toward the inner side in the fitting direction. 3. The rod-shaped member (1) is provided with the protrusion (T).
And a deformable tubular member (2) in which a part of the rod-shaped member (1) is fitted and held, and the segment connector for tunnel according to claim 1 or 2. 4. The tunnel segment connector according to claim 1, wherein the protrusion (T) is a hollow member (10) having a substantially cylindrical shape.