JP2001207792A - Connecting device and segment for tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously and favourably connect and actuate a plural number of connecting devices while securing a sufficient hooking margin of an engaging part and an engaging surface without extremely increasing a diameter of the engaging part by setting and devising fit tolerance between a male member and a segment main body. SOLUTION: Both of a first clearance d1-d2 between an inside diameter d1 of a small hole part 11a of a stepped hole 11 to install a male member 3 and an outside diameter d2 of a shaft part 6 of the male member 3 and a third clearance d3-d4 between an inside diameter d3 of a large hole part 11b of the stepped hole 11 and an outside diameter d4 of a drum part 7 are set larger than a second clearance d5-d4 between an inside diameter d5 of an insertion port 4a of the female part 4 and the outside diameter d4 of the drum part 7 of the male member 3 on a connecting device forming the engaging part 5 to work to stop falling by being engaged with an engaged part 13 of the male part 4 by elastic recovering deformation in the diametrical extending direction after inserting a head end part of the male member 3 in the female part 4 with elastic diametrical contracting deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device suitable for connecting tunnel segments, that is, a female member in which a male member is provided in a second connected member and a male member can enter the first connected member. Provided at the tip of the male member,
After the male member is inserted into the female part with elastic diameter reduction, it is elastically restored in the radially expanding direction to form a locking part that locks to the locked part of the female part and prevents the female part from coming off. At the same time, the male member is formed with a slit for facilitating the elastic contraction deformation and the elastic restoration deformation thereof, and the locking portion is locked to the locked portion by inserting the male member into the female portion. The present invention relates to a connecting device configured to connect a first connected member and a second connected member to each other in a retaining state in which the male member is inserted into the female portion. The present invention relates to a technique capable of sufficiently setting a margin between a stop portion and a locked portion.

[0002]

2. Description of the Related Art A conventional connecting device is disclosed in Japanese Patent Application Laid-Open No. 9-4 / 1997.
As disclosed in Japanese Patent Application Laid-Open No. 613, it is known to connect shield segments forming a tunnel to each other. This is because if a substantially mushroom-shaped male member attached to one segment is inserted into a female portion provided on the other segment (and on the opposite side of the one segment), the distal end side of the male member is elastically deformed in the radial direction. Into the female part
The large-diameter locking portion at the tip of the male member locks the locking surface of the female portion, so that the segments can be connected to each other while increasing the reliability of the male member and the female portion from being removed.
The structure is complicated, the number of parts is large, and the cost is disadvantageous.

[0003]

Therefore, as shown in FIG. 7, a connecting device A having a greatly simplified structure has been proposed. In this connecting device A, a male member 32 having a large-diameter locking portion 35 that can be elastically displaced in the radial direction is formed at one end of the male member 32 with one bolt in advance.
The female portion 34 into which the second portion 33 can enter is inserted into the other segment 33.
The two segments 31 and 33 are connected by the retaining action of the locking portion 35 by inserting the male member 32 into the female portion 34 of the other segment 33 already installed.

[0004] That is, when the male member 32 is inserted into the female portion 34, the locking portion 3 is formed by the action of the outer peripheral tapered surface 35t.
5 is elastically reduced in diameter and inserted into the insertion opening 34a of the female portion 34, and elastically deformed in the radially expanded direction after insertion, the locking portion 35 at the distal end is locked to the locking surface 36 of the female portion 34. Relative connection is made in the state where it is stopped. The male member 32 is formed with a plurality of long slits 37 along the insertion direction in the circumferential direction in order to facilitate the elastic expansion and contraction deformation of the locking portion 35, and the inner diameter of the insertion port 34a is reduced by the male member. The diameter of the male member 32 is slightly larger than the outer diameter of the male member 32 so that the male member 32 can be satisfactorily fixed even if there is some dimensional error.
So that it could be inserted into

In a segment or the like, the connecting device is usually provided at a plurality of positions on the connecting surface. Therefore, the span between adjacent male members is so set that the male portion and the female portion are fitted without any problem. It is necessary to set the dimensional accuracy between the scalpel and the span between adjacent scalpels corresponding thereto. In this case, as a general idea of dimension setting, the gap between the outer diameter of the male member 32 and the inner diameter of the hole of one of the segments 31 into which the male member 32 is inserted is relatively small, and The value of the gap between the insertion member 34 and the insertion port 34a of the female part 34, that is, the above-described diameter difference,
This is set to be larger than the allowable dimensional error value of the spans 2 and 32.
In order to take a sufficient margin for the above, the diameter difference between the locking portion 35 and the insertion opening 34a must be considerably increased.

As a result, the locking / unlocking structure itself by the locking portion is used, for example, when the elastic reduction of the diameter of the male member exceeds the allowable limit or the diameter of the insertion port or the width of the slit becomes extremely large. May not be able to be established, so in practice, the diameter of the locking portion is set to a small value, and the locking portion with the locked portion often becomes an unstable fitting state that is not sufficient,
There was room for improvement.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the mounting structure of a male member to a member to be connected, so that the locking portion does not become extremely large in diameter than the insertion opening of the female portion. The object is to allow a plurality of coupling devices to be simultaneously and satisfactorily coupled and operated while securing a sufficient allowance for a locked portion.

[0008]

According to a first aspect of the present invention, a male member 3 is provided on a second connected member 2 and a male member is provided on the first connected member 1 as shown in FIGS. A female portion 4 into which the male member 3 can enter is provided. At the tip of the male member 3, the male member 3 is inserted into the female portion 4 with elastic diameter-reducing deformation, and then elastically restored in the diameter-enlarging direction. A locking portion 5 which is locked to the locked portion 13 of the female portion 4 and acts as a stopper is formed, and the male member 3 is provided with a slit 10 for facilitating elastic deformation and elastic recovery deformation thereof. By inserting the male member 3 into the female portion 4, the first connected member 1 and the second connected member 2 are locked in a state in which the locking portion 5 is locked to the locked portion 13. Are connected to each other, the male member 3 is connected to the second member.
It has a connecting shaft portion 6 to be inserted through an insertion hole 11a formed in the connected member 2 and a body portion 7 provided with a locking portion 5 on the distal end side, and has an inner diameter of the insertion hole 11a and the connecting shaft portion 6. The first gap d1-d2 between the outer diameter of the female part 4 is larger than the second gap d5-d4 between the inner diameter of the insertion port 4a of the female part 4 into which the body 7 is inserted and the outer diameter of the body 7. It is characterized by being set to large.

The structure of claim 2 is as shown in FIG.
In the configuration according to claim 1, the body 7 is set to have a larger diameter than the connecting shaft 6, and the root side portion of the body 7 is connected to the second connected member 2.
And a third gap d3-d4 between the inner diameter of the portion 11b of the second connected member 2 where the body 7 is fitted and the outer diameter of the body 7 is defined as a second gap d5. The value is set to be larger than -d4.

According to a third aspect of the present invention, as shown in FIGS. 2 and 3, the value of the third gap d3-d4 is set to be equal to or less than the value of the first gap d1-d2. It is characterized by the following.

According to a fourth aspect of the present invention, as shown in FIGS. 1 to 3, the male member 3 can be inserted into one side and the male member 3 can be inserted into the other side of the segment main bodies 1a and 2a in the tunnel axis direction. The female portions 4 are provided, respectively, and the male member 3 is inserted into the female portion 4 along with the elastic contraction deformation at the distal end portion of the male member 3 and elastically deformed in the radially expanding direction after the female member 4 is inserted. Forming a locking portion 5 which locks to the locked portion 13 and acts as a stopper, and forms a slit 10 in the male member 3 for facilitating elastic contraction deformation and elastic restoration deformation thereof, Locking part 5 accompanying insertion of male member 3 into female part 4
Is a tunnel segment configured such that the male member 3 and the female portion 4 can be connected to each other by a retaining action of the male member 3. The male member 3 has an insertion hole formed in the segment main bodies 1 a and 2 a. 11a, a connecting shaft portion 6 for inserting and attaching the connecting shaft portion 11a, and a body portion 7 provided with a locking portion 5 on the distal end side, wherein a first portion between the inner diameter of the insertion hole 11a and the outer diameter of the connecting shaft portion 6 is provided. The gap d1-d2 is set to be larger than the second gap d5-d4 between the inner diameter of the insertion opening 4a of the female part 4 into which the body 7 is inserted and the outer diameter of the body 7. It is assumed that.

Note that, as described above, reference numerals are provided for convenience of comparison with the drawings. However, the present invention is not limited to the configuration shown in the accompanying drawings.

[Operation] According to a first aspect of the present invention, a male member is
The connecting shaft portion is inserted into the insertion hole of the second connected member so as to be mounted separately, and the gap between the inner diameter of the insertion hole and the outer diameter of the connecting shaft portion is set to the inner diameter of the insertion port of the female portion. By making the gap larger than the gap between the outer diameter of the body and the span, the male member can move in the span direction with respect to the second connected member, so to speak, has an automatic centering function. The idea is to make it absorbed by making it work.

According to this concept, as will be described in detail in the embodiment section, the diameter of the locking portion when the locking allowance between the locking portion and the locked portion is set to the same condition is as follows. The gap between the inner diameter and the outer diameter of the connecting shaft is theoretically zero.
The gap between the inner diameter of the insertion hole and the outer diameter of the connecting shaft is smaller than the gap between the inner diameter of the insertion port of the female part and the outer diameter of the trunk. Can also be set to a small diameter, the amount of elastic contraction deformation of the locking portion is reduced, and the male member can be inserted into the female portion with a light force.

Alternatively, when the diameter of the locking portion is set to the same value, the amount of engagement between the locking portion and the locked portion can be made larger than that of the above-mentioned connecting device, so that the second portion after the connection is formed. It is possible to reduce the risk of the first connected member and the second connected member from being pulled out, and to obtain a more reliable connection state.

According to the second aspect of the present invention, the third gap between the inner diameter of the portion of the second connected member into which the body is fitted and the outer diameter of the body is set to be larger than the second gap. As a result, the above-described operation according to the configuration of claim 1 can be maintained while the connecting device is configured such that a body portion having a larger diameter than the connecting shaft portion is straddled between the first and second connected members.

According to the third aspect of the present invention, the first gap is formed by the second gap.
In addition to setting the third gap larger than the gap, the third gap between the inner diameter of the portion of the second connected member where the body is fitted and the outer diameter of the body is set larger than the second gap ( That is, the first
Gap ≧ third gap> second gap), the male member and the second gap
When the connected member relatively moves in the span direction described above, the portion of the second connected member where the trunk is fitted and the trunk of the male member come into contact with each other (see FIG. 6).

Therefore, the shearing force acting between the two connected members is opposed by the body portion having a diameter larger than the connecting shaft portion, and the limit of the opposing force of the shearing force can be increased.
For example, in a structure in which a step between the connecting shaft portion having a small diameter and the body portion is brought into contact with the side wall of the second connected member so that the body portion is fitted only into the second connected member, When the second connected member relatively moves in the span direction described above, the insertion hole and the connecting shaft portion come into contact with each other, and the shearing force acting between the two connected members is opposed by the connecting shaft portion having a small diameter. Therefore, the claimed structure is clearly advantageous in resisting shearing force as compared with such a structure.

According to the fourth aspect of the present invention, the male member has a separate structure in which the connecting shaft portion is inserted into the insertion hole of the segment main body to be attached thereto, and the inner diameter of the insertion hole and the outer diameter of the connecting shaft portion. Is larger than the gap between the inner diameter of the insertion port of the female part and the outer diameter of the trunk, so that the dimensional error of the span described above can be moved by the male member in the span direction with respect to the segment body. In other words, the idea is to make it have an automatic centering function so as to absorb it.

According to this concept, as will be described in detail in the embodiment, the diameter of the locking portion when the locking allowance between the locking portion and the locked portion is set to the same condition is as follows. The gap between the inner diameter and the outer diameter of the connecting shaft is theoretically zero.
The gap between the inner diameter of the insertion hole and the outer diameter of the connecting shaft is smaller than the gap between the inner diameter of the insertion port of the female part and the outer diameter of the trunk. Can also be set to a small diameter, the amount of elastic contraction deformation of the locking portion can be reduced, the male member can be inserted into the female portion with a light force, and the connection operation between the segments can be performed lightly.

Alternatively, when the diameter of the locking portion is the same, the amount of engagement between the locking portion and the locked portion can be made larger than that of the above-described connecting device, and the segment after connection can be formed. It is possible to obtain a more reliable connection state by reducing the likelihood that the members will come off.

[Effect] In the connecting device according to any one of the first to third aspects, (a) the gap between the fitting portion between the male member and the second connected member is reduced by the fitting portion between the male member and the female portion. The gap between the locking part and the locked part can be smoothly changed without any inconvenience by making a simple modification of the size setting, which is larger than the gap of the male part. As a result, a sufficient margin can be secured, and the connection strength between the first member to be connected and the second member to be connected and the function of preventing the removal can be improved.

In the connecting device according to the second aspect of the present invention, (b) the effect of the above (a) can be obtained while the body having a relatively large diameter is straddled between the first connected member and the second connected member. was gotten.

In the connecting device according to the third aspect, the shear strength after the connection between the first connected member and the second connected member is improved, and the connection strength between the two is increased while the connection strength between the two is strengthened.
The effect was obtained.

In the tunnel segment according to the fourth aspect, the gap between the fitting portion between the male member and the segment body is set to be larger than the gap between the fitting portion between the male member and the female portion. By simple modification of the degree of change, the operation of connecting the male member and the female part can be performed smoothly without any inconvenience, and the locking allowance between the locking part and the locked part can be sufficiently secured, and the segments can be connected. The strength and the prevention function of retaining were able to be improved.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A connecting device according to the present invention includes a large number of segments such as ductile segments, steel segments or concrete segments used in constructing a tunnel or the like in the axial direction of the tunnel and in the circumferential direction of the tunnel. It is used when connecting. Less than,
An embodiment of the present invention will be described with reference to the drawings assuming that it is made of ductile cast iron. The direction of the tunnel axis is
The direction connecting the entrance and exit of the tunnel.

As shown in FIG. 1, a female part 4 integrally formed on one side wall in the tunnel axial direction of a segment body (an example of a first connected member) 1a of the first segment 1 already installed, A connecting device A is constituted by a segment main body (an example of a second connected member) 2a of the second segment 2 connected to the male member 3 provided on the other side wall. FIG. 1 is a view of the inner side of the pit from the entrance side of the pit.

In order to connect the first segment 1 and the second segment 2, the side wall of the second segment 2 on the female part 4 side is pressed by a hydraulic jack, so that both segments 1 and 2 are pressed relatively to each other. First, the male member 3 of the two-segment 2
By inserting the female member 4 of the segment 1 through the insertion opening 4a of the female portion 4 and the locking portion 5 formed at the distal end of the male member 3 elastically restoring and expanding beyond the insertion opening 4a,
The male member 3 is engaged with the female part 4. Then, the wedge member 18 is driven into the hole 9 of the male member 3 (FIG. 1,
2).

Incidentally, although not shown, the segments 1 and 2 which are adjacent in the circumferential direction of the tunnel are forcedly slid in the axial direction of the tunnel by a bolt / nut operation after their relative arrangement or by a hydraulic jack or the like. It is connected and integrated by a wedge member fitted into the segment.

As shown in FIGS. 2 and 4, the male member 3
A rod-shaped body integrally formed with a shaft portion 6 having a male screw 6a formed at a base end, a body portion 7 having a larger diameter than the shaft portion 6, and a locking portion 5 which is a distal end portion having a larger diameter than the body portion 7. It is. From the engaging portion 5 to the body portion 7, a hollow 9 is formed by integrally forming (or drilling) by casting or blanking. Four positions are formed at equal angles in the circumferential direction, so that the elastic displacement of the locking portion 5 in the radial direction can be performed relatively easily.

The male member 3 is attached to the second segment main body 2a.
The support portion 8 provided with the stepped hole 11 for mounting is formed integrally. That is, the male member 3 is attached to the second segment 2 by inserting the root portion of the shaft portion 6 and the body portion 7 into the stepped hole 11 and screwing it with the double nut 12. The diameter of the insertion opening 4 a formed in the first segment main body 1 a is set to a value suitable for fitting the body 7 of the male member 3, and a locking surface (covered) that receives the flange 5 a of the locking portion 5. An example of the locking portion 13 is formed on the female portion 4. Collar 5
a and the locking surface 13 are in surface contact with each other at an angle perpendicular to the insertion direction of the male member 3, and the first and second segments 1 and 2 are connected to each other unless the locking portion 5 is reduced in diameter. They are not separated from each other.

As shown in FIG. 1, a screwing operation space S1 for mounting the double nut 12 is provided in the support portion 8 and the female portion 4 is provided.
Is provided with a driving operation space S2 for driving the wedge member 18. The screwing operation space S1 is set to have a size that allows a nut turning tool such as an impact wrench to be used, and the driving operation space S2 is configured to include a hydraulic jack (not shown) after the insertion of the male member 3 into the female portion 4 is completed. The width is set so that the wedge member 18 can be driven into the tapered hole 19 of the male member 3 using a driving tool.

As shown in FIG. 1, the first segment main body 1
side wall 17 on the side opposite to the side wall 17 on the side of the female part 4 in FIG.
6 is equipped with the same member as the male member 3 of the second segment 2 described above, and the second segment body 2
a side wall 1 opposite to side wall 16 on the side where male member 3 is present in FIG.
7 has the same components as the female portion 4 of the first segment 1 described above. That is, the connecting device A is provided even in the segment 1 or 2 alone, and the segments adjacent in the tunnel axis direction can be connected one after another.

In order to increase both the length of the stepped hole 11 of the support portion 8 and the length of the insertion slot 4a, the support portion 8 has a male boss portion 14 and the female portion 4 has a female boss portion. Fifteen
Are formed respectively. The male boss 14 has a longer fitting length with the connecting shaft 6, and the female boss 15 has a longer fitting length with the body 7 of the male member 3. That is, the portion 1 of the segment main body 2a and the female portion 4 in which the male member 3 is fitted.
The bosses 1 and 4a protrude so as to be thick in the male member insertion direction.

As a result, the length of the hole 9 and the length of the slit 10 can be increased, the elastic expansion and contraction of the body 7 is facilitated, and the ease of inserting the locking portion 5 into the insertion opening 4a is improved. In addition, the connection strength between the male member 3 and the support portion 8 and the connection strength between the male member 3 and the female portion 4 can both be improved, and the connection strength between the segments 1 and 2 is increased.

As shown in FIG. 2, a first gap between the inner diameter of the small hole portion (an example of an insertion hole) 11a in which the connecting shaft portion 6 in the stepped hole 11 is fitted and the outer diameter of the connecting shaft portion 6 are formed. D1, and
A large hole in which the body 7 in the stepped hole 11 is fitted (an example of a portion of the segment body 2a where the body 7 is fitted).
Each of the third gaps D3 between the inner diameter of 11b and the outer diameter of the body 7 is larger than the second gap D2 between the inner diameter of the insertion port 4a of the female part 4 and the outer diameter of the body 7. It has been set. The first gap D1 and the third gap D3 are set to the same value.
Thereby, the male member 3 and the female portion 4 can be smoothly fitted while securing a sufficient allowance (contact area) between the flange portion 5a of the locking portion 5 and the locking surface 13. I have. Next, we prove that.

In FIG. 2, it is assumed that the span between the adjacent male members 3 and the span between the adjacent female portions are both L and the tolerance is α, the inner diameter of the small hole portion 11a of the stepped hole 11 is d1, the connecting shaft is The outer diameter of the part 6 is d2, the outer diameter of the trunk 7 is d4,
The inside diameter of the large hole portion 11b of the stepped hole 11 is d3, and the insertion port 4a
Is d5, and the outer diameter of the locking portion 5 is d6. That is, the first gap: D1 = d1-d2, the second gap: D2 = d5-d4, the third gap: D3 = d3-d4, and the allowance (the radial length of the contact portion between the flange 5a and the locking surface 13). : K = d6-d5.

I. When the first and third gaps do not exist When the male member 3 is fixed to the support portion 8 by press-fitting or the like, and the gap between the small hole portion 11a and the connection shaft portion 6 is 0, the male member 3 and the female portion 4 Since the respective span tolerances are both α, at least d5 = d4 + 2α... IｉD2 = 2α is required for the body portion 7 to be able to be smoothly inserted into the insertion opening 4a, and the hanging allowance K is required.
Is K = d6-d4-2α... Ii. Therefore, as an example of specific numerical values, α = 3, d4
Assuming that = 40, the minimum value of d5 is 46, and if the minimum value of the allowance K is 6, d6 is 46 + 6 = 52 or more.

II. In the case where the first to third gaps exist The sum 2α of both span tolerances is relaxed by the first gap D1, so that the second gap D2 in the female part 4 is at least D2 = 2α−D1∴d5− d4 = 2α- (d1-d2)... iii ∴d5 = d4 + 2α- (d1-d2)... iv is required, and the allowance K is K = d6- (d4 + 2α-d1 + d2). That is, the first gap D1 which is a gap on the male member side
And the third gap D3 (when the shaft of the male member has no step, only the first gap D1) has a gap d5, that is, the inner diameter of the insertion port 4a, which is equal to (d1-d2).
It has been proved from the above equations i and iv that the minute can be reduced.

When the first gap D1 and the third gap D3 are larger than the second gap D2, that is, D1 = D3>
D2 (D1 = D3 for simplicity) By substituting this into D1 (D3) = D2 + β... Vi and substituting it into the previous equation iii, d5 = d4 + 2α− (D2
+ Β) ∴d5 = d4 + 2α−D2-β... Vii.

Next, when the second gap D2 is larger than the first gap D1 and the third gap D3, that is, D2> D1 = D
3 (D1 = D3 for simplicity) By substituting this into D2 = D1 (D3) + γ... Viii and substituting it in the previous equation iii, d5 = d4 + 2α− (D2-γ) ∴d5 = d4 + 2α−D2 + γ …… ix.

Therefore, when the first gap D1 and the third gap D3 are larger than the second gap D2, on the contrary, the second gap D
The above equations vii and ix prove that d5, that is, the inner diameter of the insertion port 4a is smaller by (β + γ) than in the case where 2 is larger than the first gap D1 and the third gap D3. Next, a specific example will be described.

II-1. When D1 = D3> D2 First, it is assumed that α = 3, d2 = 30, and d4 = 40.
If d1 = 34 and d3 = 44 from 1 = D3> D2, then d5 = 40 + 6-34 + 30 = 42 from equation iv. If the minimum value of the allowance K is 6, then from equation v, 6 = d
6-d5 = d6-42 ∴d6 = 48 or more.

II-2. When D2> D1 = D3 Next, it is assumed that α = 3, d2 = 30, and d4 = 40.
2> From D1 = D3, if d1 = 32 and d3 = 42, then from equation iv, d5 = 40 + 6-32 + 30 = 44. If the minimum value of the allowance K is 6, then from equation v, 6 = d
6-d5 = d6-44 ∴d6 = 50 or more.

As can be understood from the above description, when (a) the male member 3 and the supporting portion 8 thereof are integrated without a gap, (b) the second gap D2 becomes the first gap D1 and the third gap D1. In the case where both the first gap D1 and the third gap D3 are larger than the second gap D2, the margin between the locking portion 5 and the locking surface 13 is (C). When K is the same, it is found that the means of (c) according to the present invention requires the smallest outer diameter of the locking portion 5 according to the above equations i and vii.
And ix. In other words, if the outer diameter of the locking portion 5 is the same, the allowance K becomes the largest.

When the value of the third gap D3 is set to be equal to or less than the value of the first gap D1, that is, the first gap D1 ≧ the third gap D3.
> Second gap D2 (d1-d2 ≧ d3-d4> d5-d
In the case of 4), the shearing force can be strengthened. That is, as shown in FIG.
Due to relative displacement between the members, the male member 3
Moves with respect to the segment main body 2a, only the trunk portion 7 and the large hole portion 11b or the shaft portion 6 and the small hole portion 11a
Are brought into contact with each other (not shown). As a result, the shearing force generated between the segments 1 and 2 is opposed by the body 7 having a larger diameter than the shaft 6.

Next, the connecting operation between segments will be described. As shown in FIG. 2, first, the existing first segment 1 and the non-installed second segment 2 are opposed to each other with the male member 3 and the female portion 4 facing each other.
Press segment 2 against first segment 1. Then, the large-diameter tapered locking portion 5 is elastically reduced in diameter by the outer peripheral tapered portion 5t abutting against the hole wall of the insertion port 4a and enters the insertion port 4a.

When the push is continued, the locking portion 5 is inserted into the insertion port 4a.
The elastic diameter is restored elastically past
With the body 7 fitted in the insertion opening 4a with a small gap, the flange 5
a comes into contact with the locking surface 13 and stops. Then, as shown in FIG. 3, in the driving operation space S2, the wedge member 18 is removed by using a hydraulic jack (not shown) so as to prevent the locking portion 5 from being reduced in diameter. 1
By hitting at 9, the coupling operation and the coupling operation are completed.

In the connection state shown in FIG. 3, the innermost end of the hole 9 formed in the male member 3 is slightly smaller than the mating surface h of the first segment 1 and the second segment 2. The position of the base end (corresponding to the end of the second connected member) of the slit 10 is located closer to the distal end (corresponding to the first connected member) than the mating surface h. To Therefore, both adjacent segments 1,
The shearing force acting between the two is set so as to be received by the body 7 of the hollow cross-section where the slit 10 does not exist.

Incidentally, the side wall 1 of the segment body 1a, 2a opposite to the side wall 16 on which the male member 3 is provided.
The female part 7 is provided with a female part 4, and the connecting device A is provided for each of the segments 1 and 2 alone. The position of the segment body side end in the slit 10 formed in the male member 3 is the segment body 1a, 2a
Is located closer to the retaining portion 5 than the outer surface of the side wall 16 on which the male member 3 is provided, and the existing first segment 1 and the non-installed second segment 2 can be defined.
Are the same parts. Therefore, the outer surfaces of the side walls 16 and 17 become mating surfaces h when the segments are connected to each other.

[Alternative Embodiment] As shown in FIG. 5, the innermost end of the hole 9 formed in the male member 3 is more than the mating surface h of the first segment 1 and the second segment 2. It is more convenient to set the position closer to the segment 1 side. According to this, the shearing force acting between the adjacent segments 1 and 2 is received by the body portion 7 having a solid cross-sectional portion where neither the slit 10 nor the hole 9 exists, and the anti-shearing force is further improved. It can be done.

When the segment main bodies 1a and 2a are made of concrete, the support portion 8 of the male member 3 is constituted by a separate support metal 8 made of a cast iron material or the like anchored to the segment main body, and the female portion 4 is also formed. The female member 4 is a separate member made of a cast iron material or the like anchored to the segment body. In a steel segment formed by welding steel plates, the support portion 8 of the male member 3 is formed by welding another member, and the female portion 4 is formed by welding another member. Is an expression including the female member 4.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a segment laying state in a tunnel.

FIG. 2 is a side view showing the structure of a male member and a female part, and dimensions of each part.

FIG. 3 is a side view of a partially cutaway showing a connection structure between a male member and a female portion.

FIG. 4 shows the structure of a male member, (a) is a perspective view,
(B) Front view

FIG. 5 is a side view of a partially cutaway showing a coupling device having another structure.

FIG. 6 is a side view of a partially cutaway showing a state in which a male member opposes a shearing force.

FIG. 7 is a side view of a partially cutaway showing a coupling device of a comparative example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st connected member 1a Segment main body 2 2nd connected member 2a Segment main body 3 Male member 4 Female part 4a Insertion opening 5 Locking part 6 Connection shaft part 7 Body 10 Slit 11a Insertion hole 11b Body in segment body Part to be inserted d1-d2 First gap d5-d4 Second gap d3-d4 Third gap

Continued on the front page (72) Inventor Kazunori Tsujimoto 7-1-22, Minami-enkajima, Taisho-ku, Osaka-shi, Osaka Inside Kubota-Enkajima Plant (72) Inventor Shigeharu Yagura 7 Minamienkajima, Taisho-ku, Osaka, Osaka No. 1-22 F-term in Kubota Enkajima Plant (reference) 2D055 GC04

Claims (4)

[Claims] 1. A male member to be attached to a second connected member, a female portion into which the male member can enter is provided in the first connected member, and a distal end portion of the male member is accompanied by elastic diameter reduction. The male member is inserted into the female part and elastically deformed in the radially enlarged direction after being inserted into the female part. A slit is formed in the male member for facilitating the elastic diameter reduction and elastic restoration deformation thereof. By inserting the male member into the female portion, the locking portion engages with the locked portion. A connection device configured to connect the first connected member and the second connected member to each other in a stopped and stopped state, wherein the male member is connected to the second connected member. Connection for insertion through the insertion hole formed in the member A shaft portion, and a body portion provided with the locking portion on the distal end side, wherein a first gap between the inner diameter of the insertion hole and the outer diameter of the connection shaft portion is formed by the body portion of the female portion. A coupling device which is set to be larger than a second gap between an inner diameter of an insertion port to be inserted and an outer diameter of the body. 2. The body part is set to have a larger diameter than the connecting shaft part.
The base side portion of the body is configured to be fitted into a second connected member, and an inner diameter of a portion of the second connected member into which the body is fitted and an outer diameter of the body. The third gap,
The connecting device according to claim 1, wherein the connecting device is set to be larger than the second gap. 3. The coupling device according to claim 2, wherein the value of the third gap is set to be equal to or less than the value of the first gap. 4. A male member is provided on one side in the tunnel axis direction of the segment main body, and a female portion into which the male member can be inserted is provided on the other side, and the distal end of the male member is elastically reduced in diameter. The male member is inserted into the female portion and elastically deformed in the radially enlarged direction after the male member is inserted, thereby forming a locking portion that locks to the locked portion of the female portion and acts as a stopper. In addition, a slit is formed in the male member for facilitating elastic diameter reduction deformation and elastic restoration deformation thereof, and the locking action of the locking portion accompanying insertion of the male member into the female portion. A tunnel segment configured such that the male member and the female portion can be connected to each other, and a connection for attaching the male member to the male member by inserting the male member and the female portion through an insertion hole formed in the segment body. Shaft and tip side A torso provided with the locking portion, a first gap between the inner diameter of the insertion hole and the outer diameter of the connection shaft portion, the insertion opening of the female portion in the insertion port where the body is inserted A tunnel segment set to be larger than a second gap between an inner diameter and an outer diameter of the body.