JP2008082067A - Joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure adapted to a mesh opening and capable of coping with the dislocation of mutual segments, against an axial tensile force in a connecting part by a simple structure. <P>SOLUTION: This joint structure 1 connects the mutual segments by inserting and fitting a male member 20 composed of a shaft 21 and a base 22 formed in a flange shape at the base end of the shaft 21 and embedded in a partially projected state in the other segment 3, into a female member 10 being a cylindrical member embedded in one segment 2. The male member 20 is installed in a housing 30 composed of a general part 31 formed around the shaft 21 and a width expanding part 32 formed by diametrically expanding an inner diameter at the base end of the general part 31 in a state of allowing the end surface 22a of the base 22 to abut on the bottom surface 32a of the width expanding part 32 and forming a clearance S between the locking surface 22b of the base 22 and the locking surface 32b of the width expanding part 32, and an elastic member 40 is also interposed in this clearance S. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a joint structure for connecting structures.

  Conventionally, the segments are connected by bolt joints. In the connection of segments by this bolted joint, the use of elastic washers makes it possible to connect the segments in the axial direction that occur during an earthquake or unequal subsidence (hereinafter sometimes referred to simply as “earthquake etc.”). Corresponding to misalignment (opening, wrong eyes, etc.). However, the bolted joint has a problem that it is difficult to manage bolts and the like separately from the segments, and it takes time to manage and tighten these bolts and the like.

  On the other hand, many boltless joints have been developed and put into practical use for the purpose of speeding up tunnel construction by omitting the work of tightening bolts, etc. When connecting a new segment behind an existing segment, this boltless joint inserts a male member formed so as to protrude from one segment into a female member formed on the other segment. The member and the female member are connected by frictional resistance, compression force, or the like. However, this boltless joint does not sufficiently cope with the axial pulling force generated during an earthquake or the like, and has a problem that it cannot cope with the opening or misalignment of the joint portion of the segment. It was.

  Therefore, the present applicant has developed a joint structure capable of dealing with the opening and misalignment in the segment joint portion, and has been put to practical use, while making it possible to save labor during construction (Patent Document 1). reference).

As shown in FIG. 7, the joint structure 101 described in Patent Document 1 is formed on a female member 110 that is a cylindrical member formed on one segment 102 so as to protrude from an end surface of the other segment 103. The male member 120 is inserted and fitted.
The male member 120 is internally provided with an outer cylindrical member 131 that is a cylindrical member embedded in the other segment 103 and a base portion that is edge-cut by the outer cylindrical member 131, and an insertion portion projects from the outer cylindrical member 131. A plug member 121 that is a cylindrical member, an extension member 122 that penetrates the plug member 121 in the long axis direction and is fixed to the insertion portion of the plug member 121 and the outer cylinder member 131, and the extension member 122. A space is formed by providing a fixing member 132 provided at an end portion on the base side of the outer cylinder member 131 for fixing and a cylindrical cover 133 on the opposite side of the plug member 121 of the fixing member 132, and the space is extended in this space. And an elastic member 140 fixed to the member 122. The insertion part of the plug member 121 is formed inside the female member 110 so as to be capable of being crimped. In the drawing, reference numeral 123 denotes a nut for fixing the elongated member 122 to the tip of the plug member 121 and the fixing member 132. Reference numeral 124 denotes a filler filled in the plug member 121.

Japanese Unexamined Patent Publication No. 2004-360445 ([0029]-[0031], FIG. 5)

In the conventional joint structure 101, in the event of an earthquake or the like, when an opening of a segment or a mistake occurs, the insertion portion of the plug member 121 is fixed inside the female member 110, and the outer cylinder member 131 is inserted. And the end surface of the plug member 121 is separated from the fixing member 132, and at the same time, the extension member 122 is extended and the elastic member 140 is compressed. Thereafter, the segment displacement can be contracted by the restoring force of the extending member 122 and the restoring force of the elastic member 140. However, with the arrangement of the elastic member 140, a space is formed on the back surface of the fixing member 132, so that a part of the reaction force that acts when the male member 120 is inserted into the female member 110 passes through the plug member 121. Responsible by the fixing member 132. Therefore, the fixing member 132 needs to have sufficient strength to withstand this reaction force, and the member thickness may need to be increased. In addition, there is a problem that the fixing member 132 may be deformed when an unexpected stress is generated due to misalignment at the time of joining. Furthermore, since the joint structure 101 has a complicated configuration, the material cost and the like may be relatively high.
Further, a part of the reaction force acting when the male member 120 is inserted into the female member 110 acts as a concentrated load on the cylindrical cover 133 via the extending member 122. For this reason, setting the strength of the cylindrical cover 133 or the segment 103 based on the concentrated load transmitted from the distal end of the extending member 122 may become excessive.

  The present invention has been made in order to solve the above-mentioned problems, and it can cope with the tensile force in the axial direction at the connecting portion with a simple structure, and can cope with the opening of the segments and the difference between the openings. It is an object of the present invention to provide a joint structure.

  In order to solve the above-mentioned problem, the invention according to claim 1 includes a female member which is a cylindrical member embedded in one segment, and a male member embedded in a state in which a part protrudes in the other segment. A housing formed in the other segment and housing the male member; and an elastic member interposed between the housing and the male member in the housing, the protruding portion of the male member Is a joint structure for connecting the segments by inserting and fitting to the female member, the male member comprises a shaft portion and a base portion formed in a flange shape at the base end portion of the shaft portion, The housing includes a general portion formed around the shaft portion, and a widened portion formed by expanding an inner diameter of the general portion at a base end portion of the general portion, and an end surface of the base portion is formed. Said widening The male member is housed in the housing in a state in which a gap is formed between the shaft-side surface of the base and the inner-side wall surface of the widened portion, An elastic member is interposed in the gap.

In such a joint structure, since the end surface of the base is in contact with the inner wall surface of the housing formed in the segment, the reaction force at the time of pushing can be handled by the segment body. Therefore, it is not necessary to use an unnecessarily high-strength material as a member constituting the joint structure (housing), and a simple and inexpensive construction can be achieved.
In addition, since the base part of the male member is formed in a flange shape, the reaction force at the time of pushing is transmitted to the segment body in a state of being dispersed by the area of the enlarged base part (expanded), so the segment body The burden on is small.

  In addition, since a gap is formed between the shaft side surface of the base part and the inner wall surface of the widened part of the housing on the general part side, misalignment (opening, misalignment, etc.) occurs at the connecting part of the segments. When this occurs, the base part moves relative to the inner wall surface on the general part side of the widened part, and the deviation can be absorbed. Therefore, the burden on the joint structure is small and suitable.

  Further, when the base portion is relatively moved, the elastic member interposed in the gap is compressed. And the shift | offset | difference of the segments which generate | occur | produced at the time of an earthquake etc. contracts with the restoring force of an elastic member. Therefore, the connecting portion between the segments is not displaced due to an earthquake or the like, and a high-quality connecting structure is maintained. Here, the elastic member in this specification refers to a member having a function of contracting the displacement between segments by a repulsive force (restoring force) after being compressed and deformed.

  Moreover, in this specification, a segment is not limited to a member used as a tunnel lining in a shield method or a tunnel boring machine (TBM) method, but a propulsion pipe or a continuously disposed box in the propulsion method. It shall include any continuous tunnel lining member, such as a culvert.

  Also, the outer diameter of the shaft portion indicates the width with respect to the cross section of the shaft portion when the sectional shape of the shaft portion is other than a circle. Similarly, the inner diameter of the housing is also when the sectional shape of the housing is other than a circle. Indicates the width of the cross section. The width of the shaft (housing) with respect to the cross-section is unified to be a diagonal length if the shape of the fixing member is rectangular or polygonal, a diameter if circular, or a long side if elliptical.

According to a second aspect of the present invention, there is provided a female member that is a cylindrical member embedded in one segment, a male member embedded in a partially protruding state in the other segment, and the one segment. A housing formed to house the female member, and an elastic member interposed between the housing and the female member in the housing, and the protruding portion of the male member is inserted into the female member A joint structure for connecting the segments by fitting, wherein the female member includes a main body portion and a base portion formed in a flange shape at a base end portion of the main body portion, and the housing includes the main body A general portion formed around the portion, and a widened portion formed by expanding the inner diameter of the general portion at the base end portion of the general portion, and the end surface of the base portion is on the bottom surface of the widened portion. Contact In addition, the female member is housed in the housing in a state where a gap is formed between a surface of the base portion on the main body portion side and an inner wall surface of the widened portion, and the elastic member is It is characterized by being interposed in the gap.
With this joint structure, it is possible to obtain the same effect as that of the joint structure described in claim 1.

  In the joint structure, if a highly elastic metal, high-density polyethylene, hard rubber, FRP resin, or the like is used as the elastic member, it is preferable because the displacement generated at the joint portion of the segment is contracted by an excellent elastic force. It is.

  In the joint structure, if the inner diameter of the female member is slightly smaller than the outer diameter of the shaft member, the male member can be crimped by the female member, and the male member can be prevented from coming out. Being preferred.

  Further, in the joint structure, if a cushioning material is wound around the outer peripheral surface of the cylindrical member, it is possible to absorb the expansion of the female member when the male member is inserted into the female member, which is preferable. .

  According to the joint structure of the present invention, it is possible to provide a joint structure that can handle the tensile force in the axial direction at the connecting portion with a simple structure and can cope with the displacement between the segments.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.
Here, FIG. 1 is a cross-sectional view showing the joint structure according to the first embodiment. Moreover, FIG. 2 is sectional drawing which shows the state before the connection of the joint structure which concerns on 1st Embodiment. FIG. 3 is a cross-sectional view showing the situation when an axial tensile force acts on the segment in the joint structure according to the first embodiment. FIG. 4 is a cross-sectional view showing the second embodiment. FIG. 5 is a cross-sectional view showing the third embodiment. Further, FIG. 6 is a cross-sectional view showing a fourth embodiment.

<First Embodiment>
In the first embodiment, as shown in FIG. 1, when connecting two segments 2 and 3 (one segment 2 and the other segment 3) in shield tunnel construction, the joint structure according to the present invention. The case of applying will be described. In addition, the segment which can use the joint structure which concerns on this invention is not limited to the segment of a shield tunnel, For example, it can be used also for the segment in TBM (tunnel boring machine) construction.

  As shown in FIG. 1, the joint structure 1 includes a female member that is a cylindrical member embedded in one segment 2, a male member 20 that is embedded in a state in which the other segment 3 protrudes, and the other Embedded in the segment 3 of the housing 30 for slidably installing the male member 20, and an elastic member 40 interposed between the housing 30 and the male member 20 inside the housing 30. Thus, by inserting the protruding portion of the male member 20 into the female member 10, the female member 10 and the male member 20 are fitted (insertion fitting), and one segment 2 and the other segment 3 are connected. Yes.

  What is necessary is just to set suitably the installation location and the number of installation of the joint structure 1 according to the cross-sectional shape of the segments 2 and 3, the stress which acts on the assumed tunnel, etc. FIG.

  As shown in FIGS. 1 and 2, the female member 10 is a bottomed cylindrical member arranged so that the other segment 3 side (left side in FIG. 1) is open at the end of one segment 2. The main body 11 is a main component. Although the material which comprises the female member 10 is not limited, what is necessary is just to be able to fit (insertion fitting) in the state which inserted the male member 20 by friction resistance force and compression force. . Moreover, the cylindrical member which comprises a female member does not necessarily need to have a bottom.

As shown in FIG. 1, the female member 10 includes a main body portion 11, a base portion 12 formed in a flange shape at an end portion on the opposite side to the other segment 3 of the main body portion 11 (right end portion in FIG. 1), , And is prevented from coming off from one segment 2. As shown in FIG. 2, the inner diameter D <b> 1 of the main body portion 11 is formed to be slightly smaller than the outer diameter D <b> 2 of the shaft portion 21 of the male member 20. Further, the cushioning material 13 is wound around the outer peripheral surface of the main body portion 11 at a position corresponding to the insertion portion of the shaft portion 21, and the main body portion 11 can be widened as the shaft portion 21 is inserted. Yes.
In addition, although the material which comprises the buffer material 13 is not limited, In 1st Embodiment, a high density polyethylene or FRP resin shall be used. Further, for the purpose of more firmly fitting with the male member 20, an anti-slip process may be performed such as forming irregularities on the inner peripheral surface of the main body 11. Further, in order to prevent the female member 10 from coming out of the segment (one segment 2), an irregular surface is formed on the outer peripheral surface of the female member 10 or an anchor member or the like is installed instead of forming the base 12. May be.

  In 1st Embodiment, although the female member 10 shall be arrange | positioned so that a tunnel axial direction may be made | formed, the arrangement direction of the female member 10 is segments (one segment 2 and the other segment 3). Needless to say, it may be set as appropriate according to the pushing direction at the time of connection.

The male member 20 is made of a steel member, and includes a shaft portion 21 and a base portion 22 formed in a flange shape at the base end portion (left end portion in FIG. 1) of the shaft portion 21. In 1st Embodiment, although the male member 20 shall be arrange | positioned so that the axial part 21 may become parallel to a tunnel axial direction, the directions of the male member 20 are segments (one segment 2 and the other). Needless to say, it may be set as appropriate according to the pushing direction when the segments 3) are connected.
Here, it goes without saying that the material and structure constituting the male member 20 are not limited. For example, the male member 20 may be configured by filling concrete inside a hollow steel member.

  The shaft portion 21 is formed in a rod shape with a circular cross section, and the base portion 22 is formed by increasing the diameter of the base end portion of the rod-shaped member constituting the shaft portion 21, and the width (outer diameter) of the base portion 22 is formed. ) Is larger than the inner diameter of the general portion 31 of the housing 30. The method of forming the base portion 22 is not limited. For example, the base portion 22 may be larger than the method of expanding the diameter by applying a compressive force in the axial direction while the end portion of the shaft portion is heated and softened. You may carry out by joining the plate-shaped member with a big width | variety integrally by welding etc. Moreover, the member which comprises the male member 20 is not limited to a steel rod-shaped member, For example, you may comprise by a cylindrical member. Furthermore, it goes without saying that the cross-sectional shape of the shaft portion 21 is not limited to a circle, and for example, it may be formed in a square or other polygons. Further, for the purpose of enhancing the fitting property with the female member 10, anti-slip processing such as formation of irregularities on the outer peripheral surface of the shaft portion 21 may be performed. Further, the shape of the base portion 22 is not limited as long as the locking surface 22b that can be locked to the widened portion 32 of the housing 30 is formed. You only have to set it.

  As shown in FIG. 2, the distal end side of the shaft portion 21 protrudes from the other segment 3 from the substantial center, and the proximal end portion side is accommodated (accommodated) in the housing 30 from the substantial center. The outer diameter (width) D2 of the shaft portion 21 is slightly larger than the inner diameter (width) D1 of the female member 10. The relationship between the outer diameter D2 of the shaft portion 21 and the inner diameter D1 of the female member 10 is such that the outer diameter D2 is equal to or greater than the inner diameter D1 so that the pull-out force acting on the joint structure 1 does not come out during an earthquake or the like. What is necessary is just to set suitably so that it may become. That is, the frictional resistance force between the main body portion 11 and the shaft portion 21 may be set to be larger than the sum of the frictional resistance force between the shaft portion 21 and the general portion 31 and the compression resistance force of the elastic member 40. .

  The end portion 22a of the base portion 22 abuts against the bottom surface 32a of the widened portion 32, and between the locking surface (shaft side surface) 22b and the locking surface 32b (general portion side inner wall surface) of the widened portion 32. With the gap S formed, the housing 30 is housed (accommodated) in the widened portion 32.

  As shown in FIG. 1, the housing 30 has a general portion 31 formed of a cylindrical member having an inner diameter of the same degree as the outer diameter of the shaft portion 21 and a base end portion (left end portion in FIG. 1) of the general portion 31. A widened portion 32 made of a box-shaped member formed so as to expand the inner diameter of the portion 31 is integrally joined. Then, the housing 30 is formed by embedding the general portion 31 and the widened portion 32 in the other segment 3 so that the general portion 31 opens at the end face of the other segment 3.

The housing 30 (the general portion 31 and the widened portion 32) has a low frictional resistance with the male member 20 and is slidably housed in the male member 20. Moreover, since the circumference | surroundings of the housing 30 are hardened with concrete, intensity | strength is not requested | required of the material which comprises the housing 30 itself.
In the first embodiment, the general portion 31 and the widened portion 32 are configured by separate members. Needless to say, the general portion 31 and the widened portion 32 may be configured by processing one member. Moreover, the material which comprises the housing 30 is not limited, What is necessary is just to select and use from a well-known material suitably. Further, for the purpose of preventing the housing 30 from coming out of the segment (the other segment 3), an uneven surface may be formed on the outer peripheral surface of the housing 30, or an anchor member or the like may be installed.

  As shown in FIG. 1, the housing 30 has an end surface 22 a of the base portion 22 of the male member 20 that abuts against a bottom surface 32 a of the widened portion 32, and a locking surface 22 b of the base portion 22 and a locking surface 32 b of the widened portion. The male member 20 is housed (accommodated) so that a gap S is formed therebetween.

The elastic member 40 is a highly elastic member interposed in a gap S formed between the locking surface 22b of the male member 20 and the locking surface 32b of the housing 30, and is made of a metal such as copper or high-density polyethylene. , Hard rubber or FRP resin.
In the first embodiment, by inserting the shaft portion 21 of the male member 20 through the ring-shaped elastic member 40 and arranging the male member 20 in the housing 30 after being disposed on the surface of the locking surface 22b. The elastic member 40 is disposed in the gap S. In addition, the elastic member 40 is a material capable of contracting the openings between the segments 2 and 3 by the restoring force (repulsive force) after being compressed and deformed by the openings between the segments 2 and 3 generated during an earthquake or the like. If it is, the material and shape are not limited.

  The elastic member 40 has a strength and a shape (thickness) by correlating the gap formed by the strength and the relationship between the shape of the elastic member 40 and the shape of the gap S and the pulling force at the time of the assumed L2 earthquake. And outer diameter).

  As shown in FIG. 2, the connection of the segments 2 and 3 used in the joint structure 1 according to the first embodiment is performed from the opening of the female member 10 embedded in the existing segment (one segment) 2. This is done by inserting the protruding portion of the male member 20 embedded in a state protruding from the newly established segment (the other segment) 3. In addition, the code | symbol 50 in drawing is a water stop material.

  At this time, since the inner diameter D1 of the female member 10 is slightly smaller than the outer diameter of the male member 20 (shaft portion 21), the male member 20 is inserted while expanding the female member 10. In addition, since the buffer material 13 is wound around the female member 10 at a portion corresponding to the male member 20, the segment 2 is not damaged by the widening accompanying the insertion of the male member 20.

  In the joint structure 1 according to the first embodiment, the inner diameter of the female member 10 is slightly smaller than the outer diameter of the male member 20 (shaft portion 21). By inserting, the male member 20 does not come out of the female member 10 by fitting firmly and opening the segments.

  When a tensile force in the tunnel axis direction acts during an earthquake or the like, openings are generated in the segments 2 and 3. At this time, since the male member 20 is firmly fitted to the female member 10, the shaft portion 21 accommodated in the female member 10 is not pulled out (shifted in the direction of the other segment 3). On the other hand, the portion of the shaft portion 21 slidably accommodated in the housing 30 is compressed between the end surface 22a of the base portion 22 and the bottom surface 32a of the widened portion 32 as shown in FIG. In this state, a gap is formed.

  At this time, the elastic member 40 is deformed within the elastic deformation range without being deformed more than a certain amount because the elastic member 40 has a shape and strength that are set in correlation with the pulling force at the time of the L2 earthquake assumed in advance. To do.

  As shown in FIG. 3, after dealing with the pulling force at the time of the earthquake, the mesh M is contracted by the repulsive force of the elastic member 40.

  According to the joint structure 1 according to the first embodiment, the male member 20 is disposed in a state in which the end surface 22a of the male member 20 is in contact with the bottom surface 32a of the housing 30 embedded in the other segment 3. Therefore, the reaction force generated when the male member 20 is inserted into the female member 10 can be handled by the other segment 3. For this reason, it is not necessary to use a high-strength member as the member of the housing 30, and it can be configured at low cost. That is, since the stress is transmitted to the other segment 3, the housing 30 may be anything that slidably houses the male member 20 without requiring strength.

  Further, since the housing 30 (the widened portion 32) is formed so as to be able to lock the base portion 22 of the male member 20, the male member 20 does not come out and the segments 2 and 3 can be suitably connected. it can.

<Second Embodiment>
Next, a second embodiment will be described with reference to FIG.
As shown in FIG. 4, the joint structure 1 ′ according to the second embodiment uses a spring member as the elastic member 40.

  Although the material which comprises a spring member (elastic member 40) is not limited, as shown in FIG. 4, the disc spring 41 is used in 2nd Embodiment. The disc spring 41 is disposed in a space formed between the base portion 22 ′ of the male member 20 ′ and the reaction force plate 33 of the housing 30.

  The male member 20 ′ according to the second embodiment includes a cap member 21a whose shaft portion 21 ′ is a cylindrical steel pipe, and a non-shrinkable mortar 21b filled in the cap member 21a. It is configured. Further, the base portion 22 'of the male member 20' is constituted by a washer that is integrally fixed to the base end portion of the cap member 21a. The base portion 22 'has an outer diameter (width) larger than the outer diameter of the cap member 21a, and is formed in a flange shape at the base end portion of the shaft portion 21'. In addition, the fixing method of the cap member 21a and the base 22 'is not limited, and may be appropriately performed by known means such as friction welding or welding. Since the configuration of the other male member 20 'is the same as that of the male member 20 shown in the above embodiment, detailed description thereof is omitted. The base 22 'is not limited to a washer, and a known material such as a steel plate can be used as appropriate.

  The housing 30 according to the second embodiment includes a general portion 31 made of a vinyl chloride pipe, polyethylene foam, or the like, and an inner diameter of the general portion 31 at a base end portion (left end portion in FIG. 4) of the general portion 31. It is configured by integrally joining a widened portion 32 made of a box-shaped member formed so as to expand the diameter. The widened portion 32 is a box that is inserted through a box member 34 made of a U-shaped thin-walled steel plate opened on the female member side (right end portion in FIG. 4) in cross section and the shaft portion 21 ′ of the male member 20 ′. It is comprised from the reaction force board 33 formed so that the opening part of the member 34 might be shielded. Since the other configuration of the housing 30 is the same as the contents of the housing 30 shown in the above embodiment, detailed description thereof is omitted. The material, member thickness, and the like constituting the reaction force plate 33 are not limited as long as they have sufficient proof strength against the stress acting on the disc spring 41, but the second embodiment. Then, it shall comprise with a steel plate.

  Moreover, since the matter regarding the structure of the female member 10 which concerns on 2nd Embodiment is the same as the content shown by the said embodiment, detailed description is abbreviate | omitted.

  As described above, also by the joint structure 1 ′ according to the second embodiment, it is possible to obtain the same function and effect as the function and effect shown in the above embodiment.

<Third Embodiment>
In 3rd Embodiment, as shown in FIG. 5, the joint structure 1 which connects the two segments 2 and 3 (one segment 2 and the other segment 3) is demonstrated.

  As shown in FIG. 5, the joint structure 1 includes a female member 10 that is a cylindrical member embedded in one segment 2, and a male member 20 that is embedded in a state in which a part protrudes from the other segment 3; The housing 30 is embedded (formed) in one segment 2 and slidably houses the female member 10. The protruding portion of the male member 20 is inserted into the female member 10, and the male member 20 is inserted into the female member 10. By fitting (insertion fitting), one segment 2 and the other segment 3 are connected. Note that an elastic member 40 is interposed between the housing 30 and the female member 10 inside the housing 30.

  What is necessary is just to set suitably the installation location and the number of installation of the joint structure 1 according to the cross-sectional shape of the segments 2 and 3, the stress which acts on the assumed tunnel, etc. FIG.

  As shown in FIG. 5, the female member 10 includes a main body portion 11 and a base portion 12 formed on an end portion on the opposite side of the other segment 3 of the main body portion 11 (right end portion in FIG. 5). Has been. The main body 11 is formed of a bottomed cylindrical member disposed so that the other segment 3 side (left side in FIG. 5) is open at the end of one segment 2. Although the material which comprises the female member 10 is not limited, what is necessary is just to be able to fit (insertion fitting) in the state which inserted the male member 20 by friction resistance force and compression force. .

  In 3rd Embodiment, although the female member 10 shall be arrange | positioned so that a tunnel axial direction may be made, the arrangement direction of the female member 10 is segments (one segment 2 and the other segment 3). Needless to say, it may be set as appropriate according to the pushing direction at the time of connection.

The inner diameter of the cylindrical member constituting the main body portion 11 (female member 10) is formed slightly smaller than the outer diameter of the shaft portion 21 of the male member 20. The base 12 is formed to have a width (outer diameter) larger than the outer diameter of the cylindrical member constituting the main body 11, and the width (outer diameter) of the base 12 is larger than the inner diameter of the general portion 31 of the housing 30. Is also big.
The relationship between the outer diameter D2 of the shaft portion 21 and the inner diameter D1 of the female member 10 is such that the outer diameter D2 is equal to or greater than the inner diameter D1 so that the pull-out force acting on the joint structure 1 does not come out during an earthquake or the like. What is necessary is just to set suitably so that it may become. That is, the frictional resistance force between the main body portion 11 and the shaft portion 21 may be set to be larger than the sum of the frictional resistance force between the shaft portion 21 and the general portion 31 and the compression resistance force of the elastic member 40. .

  The end surface 12a of the base portion 12 abuts against the bottom surface 32a of the widened portion 32, and between the locking surface (surface on the shaft portion side) 12b and the locking surface 32b (general portion side inner wall surface) of the widened portion 32. With the gap S formed, the housing 30 is housed (accommodated) in the widened portion 32.

  The male member 20 is made of a steel member, and includes a shaft portion 21 and a base portion 22 formed in a flange shape at the base end portion (left end portion in FIG. 5) of the shaft portion 21. As shown in FIG. 5, the male member 20 is embedded in the other segment 3 in a state in which the tip side protrudes from the other segment 3 from the approximate center thereof.

  The shape of the base 22 is not limited as long as the male member 20 can be prevented from coming out. Further, in order to prevent the male member 20 from coming out of the segment (the other segment 3), an irregular surface is formed on the outer peripheral surface of the male member 20 instead of forming the flange (base 22), an anchor member or the like. May be installed.

  In addition, since the matter regarding the structure of the male member 20 is the same as the content shown in 1st Embodiment, detailed description is abbreviate | omitted.

  As shown in FIG. 5, the housing 30 includes a general part 31 made of a cylindrical member having an inner diameter approximately the same as the outer diameter of the main body part 11 of the female member 10, and a base end part (the left end in FIG. 1). Part) and a widened part 32 made of a box-like member formed so as to expand the inner diameter of the general part 31 are integrally joined. The housing 30 is formed by embedding the general portion 31 and the widened portion 32 in one segment 2 so that the general portion 31 opens at the end face of the one segment 2.

  The housing 30 (the general portion 31 and the widened portion 32) has a low frictional resistance between the female member 10 and the female member 10 is slidably housed. Moreover, since the circumference | surroundings of the housing 30 are hardened with concrete, intensity | strength is not requested | required of the material which comprises the housing 30 itself.

  As shown in FIG. 5, the housing 30 has an end surface 12 a of the base portion 12 of the female member 10 that abuts against a bottom surface 32 a of the widened portion 32, and an engagement surface 12 b of the base portion 12 and an engaging surface 32 b of the widened portion. The female member 10 is housed (accommodated) so that a gap S is formed therebetween.

The elastic member 40 is a highly elastic member interposed in a gap S formed between the locking surface 12b of the female member 10 and the locking surface 32b of the housing 30, and is made of a metal such as copper or high-density polyethylene. , Hard rubber or FRP resin.
Since other matters related to the elastic member 40 are the same as the contents shown in the first embodiment, detailed description thereof is omitted.

  In the joint structure 1 according to the third embodiment, since the inner diameter of the female member 10 (main body portion 11) is slightly smaller than the outer diameter of the male member 20 (shaft portion 21), the male member 20 Is inserted into the female member 10 so that the male member 20 does not come out of the female member 10 by being tightly fitted and opening the segments.

  When the openings are generated in the segments 2 and 3 due to the tensile force in the tunnel axis direction caused by the earthquake motion or uneven settlement, the female member 10 slidably accommodated in the housing 30 compresses the elastic member 40. However, it slides and moves to the other segment 3 side, and a gap is formed between the end surface 12 a of the base portion 12 and the bottom surface 32 a of the widened portion 32. At this time, the main body part 11 of the female member 10 is in a state in which a part protrudes from the one segment 2. On the other hand, since the male member 20 is firmly fitted to the female member 10, the shaft portion 21 accommodated in the female member 10 is not pulled out (shifted toward the other segment 3).

  At this time, the elastic member 40 is deformed within the elastic deformation range without being deformed more than a certain amount because the elastic member 40 has a shape and strength that are set in correlation with the pulling force at the time of the L2 earthquake assumed in advance. To do.

  After dealing with the pulling force during an earthquake, the mesh M is contracted by the repulsive force of the elastic member 40 (see FIG. 3).

  According to the joint structure 1 according to the third embodiment, the female member 10 is disposed in a state in which the end surface 12a of the female member 10 is in contact with the bottom surface 32a of the housing 30 embedded in one segment 2. Therefore, the reaction force generated when the male member 20 is inserted into the female member 10 can be handled by the one segment 2. For this reason, it is not necessary to use a high-strength member as the member of the housing 30, and it can be configured at low cost. That is, since the stress is transmitted to the one segment 2, the housing 30 only needs to slidably house the female member 10 without requiring strength.

  Further, since the housing 30 (the widened portion 32) is formed so as to be able to lock the base portion 12 of the female member 10, the female member 10 does not come out and the segments 2 and 3 can be suitably connected to each other. it can.

<Fourth embodiment>
Next, a fourth embodiment will be described with reference to FIG.
As shown in FIG. 6, the joint structure 1 ′ according to the fourth embodiment uses a spring member as the elastic member 40 in the joint structure 1 shown in the third embodiment.

  Although the material which comprises a spring member (elastic member 40) is not limited, as shown in FIG. 6, the disc spring 41 is used in 4th Embodiment. The disc spring 41 is disposed in a space formed between the base portion 12 ′ of the female member 10 ′ and the reaction force plate 33 of the housing 30.

  The housing 30 according to the fourth embodiment has an internal diameter of the general portion 31 at a general portion 31 composed of a vinyl chloride pipe, polyethylene foam, or the like, and a base end portion (right end portion in FIG. 4) of the general portion 31. It is configured by integrally joining a widened portion 32 made of a box-shaped member formed so as to expand the diameter. The widened portion 32 is a box that is inserted through the box member 34 made of a U-shaped thin-walled steel plate opened on the male member side (left end portion in FIG. 6) in cross-section and the main body portion 11 ′ of the female member 10 ′. It is comprised from the reaction force board 33 formed so that the opening part of the member 34 might be shielded. Since the structure of the other housing 30 is the same as that of the housing 30 shown in the third embodiment, detailed description thereof is omitted. The material, the member thickness, and the like constituting the reaction force plate 33 are not limited as long as they have sufficient proof strength against the stress acting by the disc spring 41, but the fourth embodiment. Then, it shall comprise with a steel plate.

  Moreover, since the matter regarding the structure of the male member 20 which concerns on 4th Embodiment is the same as the content shown in 2nd Embodiment, detailed description is abbreviate | omitted.

  As described above, also with the joint structure 1 ′ according to the fourth embodiment, it is possible to obtain the same operational effects as the operational effects shown in the third embodiment.

As mentioned above, although preferred embodiment was described about this invention, this invention is not limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the meaning of this invention.
For example, in the above embodiment, the case where the joint structure according to the present invention is applied to the joining of the segments used in the shield tunnel has been described. However, the use location of the joint structure of the present invention is not limited to this, and the propulsion is performed. It may be used in connection with tunnel propulsion pipes and box culverts.

  In the above embodiment, the housing slidably houses the male member or the female member. However, a gap is formed between the general portion of the housing and the shaft portion of the male member or the main body portion of the female member. Needless to say, it may be.

  Moreover, although the said embodiment demonstrated the case where a female member was formed in an existing segment, and a male member was formed in a new segment, a male member may be formed in an existing segment, and a female member may be formed in a new segment.

  Moreover, in the said embodiment, although the housing was formed by embedding a member (general part and wide part) in a segment (the other segment), a male member or a female member was directly processed by processing a segment. You may form the housing to accommodate.

It is sectional drawing which shows the joint structure which concerns on 1st Embodiment. It is sectional drawing which shows the state before the connection of the joint structure which concerns on 1st Embodiment. In the joint structure which concerns on 1st Embodiment, it is sectional drawing which shows a condition, when the axial tensile force acts on a segment. It is sectional drawing which shows the joint structure which concerns on 2nd Embodiment. It is sectional drawing which shows the joint structure which concerns on 3rd Embodiment. It is sectional drawing which shows the joint structure which concerns on 4th Embodiment. It is sectional drawing which shows the conventional joint structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint structure 2 One segment 3 The other segment 10 Female member 11 Main body part 12 Base part 13 Buffer material 20 Male member 21 Shaft part 22 Base part 30 Housing 31 General part 32 Widening part 40 Elastic member

Claims (5)

A female member that is a cylindrical member embedded in one segment;
A male member embedded with a part protruding in the other segment;
A housing that is formed in the other segment and houses the male member;
An elastic member interposed between the housing and the male member in the housing;
A joint structure for connecting the segments by inserting and fitting the protruding portion of the male member to the female member,
The male member comprises a shaft portion and a base portion formed in a flange shape at the base end portion of the shaft portion,
The housing includes a general portion formed around the shaft portion, and a widened portion formed by expanding the inner diameter of the general portion at a base end portion of the general portion,
The male member is in a state where an end surface of the base portion abuts against a bottom surface of the widened portion, and a gap is formed between a surface of the base portion on the shaft portion side and an inner wall surface on the general portion side of the widened portion. A joint structure characterized in that it is housed in a housing and the elastic member is interposed in the gap. A female member that is a cylindrical member embedded in one segment;
A male member embedded with a part protruding in the other segment;
A housing formed in the one segment to house the female member;
An elastic member interposed between the housing and the female member in the housing;
A joint structure for connecting the segments by inserting and fitting the protruding portion of the male member to the female member,
The female member includes a main body portion and a base portion formed in a flange shape at the base end portion of the main body portion,
The housing comprises a general part formed around the main body part, and a widened part formed by expanding the internal diameter of the general part at the base end of the general part,
The female member is in a state where an end surface of the base portion abuts against a bottom surface of the widened portion and a gap is formed between a surface of the base portion on the main body portion side and an inner wall surface on the general portion side of the widened portion. A joint structure characterized in that it is housed in a housing and the elastic member is interposed in the gap.   The joint structure according to claim 1 or 2, wherein the elastic member is made of a highly elastic metal, hard rubber, high-density polyethylene, FRP resin, or the like.   The joint structure according to any one of claims 1 to 3, wherein an inner diameter of the female member is slightly smaller than an outer diameter of the shaft member.   The joint structure according to claim 4, wherein a buffer material is wound around the outer peripheral surface of the cylindrical member.

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