JP2012172310A - Joint member of precast segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a simple and highly reliable joint member of a precast segment at a low cost.SOLUTION: A male metallic material M and a female insert F are provided. A receiving part 3 of the female insert F includes a spherical body 32 stored in a storage space 31 movably by dead weight, and a blocking member 33 stored inside the receiving part 3 movably to the back of the receiving part 3 to block the movement of the spherical body 32. While assembling a precast segment Pc, when the blocking member 33 is pushed by a shaft part 1 of the male metallic material M introduced to the receiving part 3 of the female insert F and moved to a prescribed position at the back of the receiving part 3, the spherical body 32 is moved by the dead weight, and an inner end 32a of the spherical body 32 is hooked to a neck part 15 of the shaft part 1.

Description

  As a joint fitting for joining the precast segments constituting the concrete structure, there is a joint fitting including a male joint fitting provided with an engaging concave step portion and a female joint fitting for receiving the male joint fitting. (See Patent Document 1) In this Patent Document 1, the female joint fitting is internally provided with a pair of semicircular members and a pair of semicircles outside the pair of semicircular bodies. And a leaf spring ring for tightening the shapes in directions close to each other. Due to the elastic deformation of the leaf spring ring, the distance between the pair of semicircular bodies is widened to allow the male joint fitting to pass through the distal end side, that is, to introduce the male joint fitting into the female joint fitting. Then, the elastic member of the leaf spring ring after the passage is elastically restored to engage the engaging member with the engaging concave step portion of the male joint fitting, and the precast segment provided with the male joint fitting and the female joint fitting The precast segment provided is joined.

Japanese Patent No. 4493553

  The main problem to be solved by the present invention is that a joint member (joint fitting) of this kind of precast segment can be supplied more simply, with high reliability and at low cost.

In order to achieve the above object, in the present invention, the joint member of the precast segment is a joint member of the precast segment constituting the concrete structure,
A male hardware provided with a shaft portion protruding from a butt end surface of the precast segment, and an embedded portion in the precast segment;
A male insert embedded in the precast segment so as to have a receiving portion of the shaft portion of the male metal and to have a receiving port leading to the receiving portion located at the abutting end surface of the precast segment;
The shank of the male hardware has a neck,
The receiving part of the female insert is movable toward the back of the receiving part, and a retaining member housed in a receiving space formed in the side part of the receiving part so as to be movable by its own weight directed inward of the receiving part. A blocking member that is received in the receiving portion and prevents the movement of the retaining member;
When the blocking member is moved to a predetermined position in the depth of the receiving portion by being pushed by the male metal shaft introduced into the receiving portion of the female insert during the assembly of the precast segment, the retaining member moves as described above due to its own weight. It was assumed that the inner end side of the lever retaining member was caught by the neck portion of the shaft portion.

  According to such a joint member, the male metal shaft provided on the other of the adjacent precast segments is introduced into the receiving portion of the female insert provided on one of the adjacent precast segments, and the butt end faces of both precast segments are introduced. When the two are brought into contact with each other, it is possible to create a state in which the shaft portion does not come out of the receiving portion only by the movement of the retaining member due to its own weight. Therefore, the structure of the joint member is simple, the number of components can be minimized, and the joint member can be provided at a low cost, and highly reliable joining is possible.

  If the blocking member is made of an elastically deformable material, the end of the male metal shaft and the female insert receiving portion in the state where the butted end faces of adjacent precast segments are butted as described above. Since it is sufficient if there is enough space between the inner part and the blocking member that is pushed and elastically deformed by this shaft part, the depth of the receiving part of the female insert should be minimized. Can do.

The retaining member in the female insert is a metal sphere,
Depth of accommodating the retaining space of the retaining member into the housing hole of the sphere that penetrates the side portion of the receiving portion and the outer end side of the sphere that is formed inside the receiving portion and communicates with the housing hole. Consisting of a circumferential groove,
The storage hole is provided at three or more locations with a substantially equal interval between the storage holes adjacent to each other in the circumferential direction of the circumferential groove, and the sphere is stored in each storage hole,
In some cases, the neck portion of the shaft portion of the male metal object is configured by a circumferential groove having a depth for accommodating the inner end side of the sphere.

  When the male metal shaft is introduced into the receiving part of the female insert, the blocking member is moved to the back of the receiving part by being pushed by this shaft part, and when the circumferential groove of the shaft part is located inside the storage hole, The sphere positioned above moves by its own weight, and its outer end side is stored in the accommodation space, and its inner end side is stored in the circumferential groove of the shaft portion. This creates a state where the male metal shaft does not come out of the female insert receiving part via the sphere. By providing a plurality of storage holes and spheres to be accommodated in the storage holes and at least three or more places as described above, it is possible to ensure that there are spheres that move as described above due to their own weight. Then, the sphere moved in this manner rolls in a donut-shaped space formed by the circumferential groove of the shaft portion and the circumferential groove of the receiving portion, and is further moved downward.

  In this case, furthermore, the storage hole formed in the receiving part of the female insert, the hole edge located on the receiving side, the groove edge located on the receiving side in the circumferential groove of the receiving part, It may be formed so as to be positioned on the receiving side. In such a case, a male metal shaft provided on the other of the adjacent precast segments is introduced into the receiving portion of the female insert provided on one of the adjacent precast segments, and the butt end surface of the one precast segment is introduced. And the other end of the precast segment face each other with a slight gap between them (a gap corresponding to the dimensional difference between the hole edge and the groove edge). Then, it can be caught on the neck of the shaft as described above. That is, it is possible to join adjacent precast segments at a stage immediately before the butted end faces are completely butted.

  According to this invention, the joint member of the precast segment can be made simpler, more reliable, and inexpensively supplied.

FIG. 1 is a perspective view of a joint member according to an embodiment, and a description of a closing member attached to the outside of a receiving portion of a female insert is omitted. FIG. 2 is a cross-sectional view showing a state in which the joint member according to the embodiment is provided in the precast segment, and is a state immediately before the shaft portion of the male metal piece is introduced into the receiving portion of the female insert. FIG. 3 shows an enlarged main part of FIG. FIG. 4 is a cross-sectional view showing the receiving portion of the female insert of FIG. 3 in a cross-section in a direction perpendicular to the axial center line. FIG. 5 is a cross-sectional view showing a state in which the male metal shaft portion is introduced into the female insert receiving portion from the state shown in FIG. FIG. 6 is a cross-sectional view showing a state where the male metal shaft is introduced to the receiving portion of the female insert up to the position where the circular groove of the shaft reaches the inside of the housing hole of the sphere, A gap is left between the butt end faces. 7 is a cross-sectional view showing the state of FIG. 6 in a cross-section at the same position as FIG. FIG. 8 is a cross-sectional view showing a state where the male metal shaft portion is fully inserted into the receiving portion of the female insert, and the abutting end surfaces of adjacent precast segments are abutted without a gap. 9 is a cross-sectional view showing the state of FIG. 8 in cross section at the same position as FIG.

  Hereinafter, typical embodiments of the present invention will be described with reference to FIGS. The joint member according to this embodiment is provided in a precast segment Pc constituting a concrete structure and used for connection at the time of assembly. Such a joint member is composed of a male metal M and a female insert F. The male metal M and the female insert F are made of metal.

  The male metal M is provided with a shaft portion 1 that protrudes from the abutting end face Pca of the precast segment Pc, and an embedded portion 2 in the precast segment Pc. That is, the embedded portion 2 of the male metal M is positioned in a mold frame (not shown) of the precast segment Pc when the precast segment Pc is manufactured. The abutting end surface Pca is a surface joined to the adjacent precast segment Pc when the precast segment Pc is assembled. Each butted end face Pca of one precast segment Pc is provided with one or both of the male metal M and the female insert F as many as necessary.

  In the illustrated example, the shaft portion 1 of the male metal object M is projected from the butted end surface Pca so that its axial center line is orthogonal to the butted end surface Pca. In the illustrated example, the embedded portion 2 and the shaft portion 1 are divided.

  The embedded portion 2 has a round bar shape, and is embedded in the precast segment Pc so that one end thereof is positioned on the same surface as the butted end surface Pca. One end side of the embedding portion 2 is configured to have a cylindrical shape in which a cylindrical opening is positioned on the abutting end surface Pca, and a female screw portion 20 is formed therein. A flange 21 is formed at the other end of the embedded portion 2.

  The shaft 1 also has a round bar shape. The shaft portion 1 has a small-diameter portion 10 at one end side and a large-diameter portion 11 at the other end side, and is provided with a circumferential step surface 12 therebetween. A male screw portion that meshes with the female screw portion 20 is formed on the outer periphery of the small-diameter portion 10, and the shaft portion 1 reaches the position where the circumferential step surface 12 abuts against one end of the embedded portion 2. The small-diameter portion 10 is screwed into the formation portion of the female screw portion 20 to be combined with the embedded portion 2. A circumferential groove 13 is formed between the tip of the large diameter portion 11 and the circumferential step surface 12. The circumferential groove 13 has a depth substantially equal to the radius of a sphere 32 serving as a retaining member, which will be described later, and has a semicircular arc shape following the outer shape of the sphere 32 in the groove width direction. Due to the circumferential groove 13, the shaft portion 1 of the male metal object M is configured such that a portion between the tip 16 and the circumferential groove 13 is a head portion 14, and a portion where the circumferential groove 13 is formed is a neck portion 15. Yes. Further, a chamfer 17 is applied to an edge portion where the surface forming the tip 16 of the shaft portion 1 of the male metal M and the peripheral surface of the shaft portion 1 are in contact with each other.

  The female insert F has the receiving portion 3 of the shaft portion 1 of the male metal M and is embedded in the precast segment Pc so that the receiving port 30 leading to the receiving portion 3 is positioned at the abutting end surface Pca of the precast segment Pc. That is, the female insert F is positioned within the mold of the precast segment Pc when the precast segment Pc is manufactured.

  The receiving portion 3 of the female insert F includes a retaining member (a sphere 32 described later) housed in a receiving space 31 formed on the side of the receiving portion 3 so as to be movable by its own weight directed inward of the receiving portion 3. A blocking member 33 that is housed in the receiving portion 3 so as to be movable toward the back of the receiving portion 3 and prevents the movement of the retaining member.

  In the illustrated example, the female insert F includes a receiving portion 3 having a cylindrical shape and a leg portion 4 having a round bar shape. One cylindrical end of the receiving portion 3 is open and serves as a receiving port 30 for the shaft portion 1 of the male metal M. On the other hand, the other cylinder end is closed. One end of the leg portion 4 is integrally connected to the closed cylinder end of the receiving portion 3. A flange 40 is formed at the other end of the leg 4.

  When the blocking member 33 is moved to a predetermined position behind the receiving portion 3 by being pushed by the shaft portion 1 of the male metal M introduced into the receiving portion 3 of the female insert F when the precast segment Pc is assembled. The stopper member is moved by its own weight, and the inner end 32 a side of the stopper member is caught by the neck portion 15 of the shaft portion 1. At this time, the outer end 32 b side of the retaining member is located in the accommodation space 31.

  In this embodiment, the shaft portion of the male metal M provided on the other of the adjacent precast segments Pc and Pc in the receiving portion 3 of the female insert F provided on one of the adjacent precast segments Pc and Pc. 1, in the state where the butted end surface Pca of the one precast segment Pc and the butted end surface Pca of the other precast segment Pc are butted, the blocking member 33 positioned above moves and the shaft portion One neck 15 is caught as described above.

  In this embodiment, the blocking member 33 is made of an elastically deformable material. In the illustrated example, the blocking member 33 has an outer diameter that is substantially equal to the inner diameter of the receiving portion 3 of the female insert F, and the space between the receiving space 3 and the inner space of the receiving portion 3. It is comprised from the column-shaped plastic foam material provided with the length over. Further, in the state where the butted end faces Pca of the adjacent precast segments Pc and Pc are butted as described above, between the tip 16 of the shaft portion 1 of the male metal M and the inner back portion of the receiving portion 3 of the female insert F. Thus, a space 34 in which the blocking member 33 which is pushed and elastically deformed by the shaft portion 1 is accommodated is secured. (FIG. 8) Thereby, in this embodiment, the depth of the receiving part 3 of the female insert F is made the minimum necessary.

  According to the joint member according to this embodiment, the male metal M provided on the other of the adjacent precast segments Pc and Pc on the receiving portion 3 of the female insert F provided on one of the adjacent precast segments Pc and Pc. When the shaft portion 1 is introduced and the butted end faces Pca of both the precast segments Pc and Pc are butted together, a state in which the shaft portion 1 does not come out of the receiving portion 3 only by the movement of the retaining member due to its own weight is created. Can do. The receiving part 3 of the female insert F only needs to include the retaining member 33 and the blocking member 33. Therefore, the structure of the joint member is simple, the number of components can be minimized, and the structure can be made more compact. In addition to being able to be provided at low cost, highly reliable joining is possible.

  In this embodiment, the retaining member in the female insert F is configured as a metal sphere 32. In addition, the retaining space 31 of the retaining member is formed in the receiving hole 3 of the spherical body 32 that penetrates the side portion of the receiving portion 3 inward and outward, and is formed in the receiving portion 3 and communicated with the receiving hole 31a. The circular groove 31f has a depth that accommodates the outer end 32b of the spherical body 32. The accommodating space 31 is provided at a position approximately in the middle of the receiving portion 3 in the depth direction. The storage hole 31 a is a round hole having a hole diameter substantially equal to the diameter of the sphere 32. Further, the circumferential groove 31f has a depth substantially equal to the radius of the sphere 32, and a cross-sectional shape in the groove width direction is a semi-arc shape following the outer shape of the sphere 32. The storage holes 31a are provided at substantially equal intervals between the storage holes 31a adjacent to each other in the circumferential direction of the circular groove 31f. In the illustrated example, the storage holes 31a are provided at four locations. A sphere 32 is accommodated. In a state where the shaft portion 1 of the male metal M is not introduced into the receiving portion 3, the spherical body 32 positioned above by the blocking member 33 also has its inner end 32a positioned at the groove opening of the circumferential groove 31f. (FIG. 4) The sphere 32 positioned below is in contact with a closing member that closes the hole 31b outside the storage hole 31a indicated by reference numeral 35 in the drawing. The closing member 35 may be configured to prevent the sphere 32 from coming out of the storage hole 31a after the sphere 32 is stored in the storage hole 31a. The closing member 35 can be constituted by, for example, a rubber band fitted on the outside of the receiving portion 3 or a sleeve body.

  On the other hand, the shaft portion 1 of the male metal piece M has an outer diameter substantially equal to the inner diameter of the receiving portion 3 of the female insert F, and the neck portion 15 is formed by a circumferential groove 13 having a depth for accommodating the inner end 32a side of the spherical body 32. It is configured.

  When the shaft portion 1 of the male metal piece M is introduced into the receiving portion 3 of the female insert F, the blocking member 33 is moved to the back of the receiving portion 3 by being pushed by the shaft portion 1, and the circumferential groove 13 of the shaft portion 1 is accommodated in the receiving hole. When positioned inward of 31 a, the sphere 32 positioned above moves by its own weight, and the outer end 32 b side thereof is accommodated in the accommodating space 31, and the inner end 32 a side thereof is in the circumferential groove 13 of the shaft portion 1. Fit. As a result, a state in which the shaft portion 1 of the male metal object M does not come out from the receiving portion 3 of the female insert F via the sphere 32 is created. By providing a plurality of the storage holes 31a and the spheres 32 to be accommodated in the storage holes 31a as described above and at least three or more places, it is possible to ensure that the spheres 32 that move as described above exist by their own weight. In the illustrated example, a taper surface 31d is formed in a hole 31c inside two storage holes 31a, 31a adjacent to each other among the four storage holes 31a to expand the diameter of the hole 31c. Even when either one of the two storage holes 31a is positioned in the horizontal direction, the stored sphere 32 is moved by its own weight. In the illustrated example, in the state where the four storage holes 31a are positioned up and down and the remaining two positions are positioned left and right, a spherical surface 32 in the upper storage hole 31a and a tapered surface 31d are formed in the hole openings. In FIG. 5, the sphere 32 in the storage hole 31a located on the left side causes the movement. The spherical body 32 thus moved rolls in a donut-shaped space formed by the circumferential groove 13 of the shaft portion 1 and the circumferential groove 31f of the receiving portion 3 and is further moved downward. (FIGS. 7 to 8) Separately from the illustrated example, the spherical body 32 is accommodated in the accommodation hole 31a in a state where an elastic member such as a plastic foam material is elastically deformed between the closing member 35 and the storage hole 31a. You can also. In this case, when the blocking member 33 moves to the back of the receiving portion 3 by the introduction of the shaft portion 1 of the male metal M into the receiving portion 3 of the female insert F, the elastic member returns elastically as described above. The movement of the sphere 32 stored in the storage hole 31a positioned in the horizontal direction can occur. In this case, it is not necessary to form the tapered surface 31d in the hole 31c inside the storage hole 31a.

  Further, in this embodiment, the storage hole 31a formed in the receiving portion 3 of the female insert F has a hole edge 31e positioned on the receiving port 30 side in the circumferential groove 31f of the receiving portion 3. It is formed so as to be positioned on the receiving port 30 side rather than the groove edge 31g positioned on the receiving port 30 side.

  Accordingly, in this embodiment, the male metal M provided on the other of the adjacent precast segments Pc and Pc is received by the receiving portion 3 of the female insert F provided on one of the adjacent precast segments Pc and Pc. The butt end face Pca of the one precast segment Pc and the butt end face Pca of the other precast segment Pc are slightly spaced from each other with a gap s (the dimension between the hole edge 31e and the groove edge 31g). In a state where the gap s) corresponding to the difference x is opened and faced, the blocking member 33 positioned above is moved and hooked on the neck portion 15 of the shaft portion 1 as described above. (FIGS. 6 and 7) In this state, the circumferential groove 13 of the shaft portion 1 of the male metal M and the circumferential groove 31f of the receiving portion 3 of the female insert F are not aligned due to the dimensional difference x. 32 does not roll as described above. After that, when the butted end surface Pca of one precast segment Pc and the butted end surface Pca of the other precast segment Pc are butted, the circumferential groove 13 of the shaft portion 1 of the male metal M and the receiving portion 3 of the female insert F The sphere 32 that is in alignment with the circumferential groove 31f is rolled as described above. (FIGS. 8 and 9)

M male metal fitting F female insert 1 shaft portion 15 neck portion 3 receiving portion 31 receiving space 32a inner end 33 blocking member

Claims (4)

A joint member of a precast segment constituting a concrete structure,
A male hardware provided with a shaft portion protruding from a butt end surface of the precast segment, and an embedded portion in the precast segment;
A male insert embedded in the precast segment so as to have a receiving portion of the shaft portion of the male metal and to have a receiving port leading to the receiving portion located at the abutting end surface of the precast segment;
The shank of the male hardware has a neck,
The receiving part of the female insert is movable toward the back of the receiving part, and a retaining member housed in a receiving space formed in the side part of the receiving part so as to be movable by its own weight directed inward of the receiving part. A blocking member that is received in the receiving portion and prevents the movement of the retaining member;
When the blocking member is moved to a predetermined position in the depth of the receiving portion by being pushed by the male metal shaft introduced into the receiving portion of the female insert during the assembly of the precast segment, the retaining member moves as described above due to its own weight. A joint member of a precast segment, wherein an inner end side of the lever retaining member is hooked to a neck portion of a shaft portion.   The joint member for a precast segment according to claim 1, wherein the blocking member is made of an elastically deformable material. The retaining member in the female insert is a metal sphere,
The storage space for the retaining member is a depth that accommodates the storage hole of the sphere that penetrates the side of the receiving portion, and the outer end side of the sphere that is formed inside the receiving portion and communicates with the storage hole. It is composed of the circumferential groove of
The storage hole is provided at three or more locations with a substantially equal interval between the storage holes adjacent in the circumferential direction of the circular groove, and the sphere is stored in each storage hole,
The joint member of the precast segment according to claim 1 or 2, wherein a neck portion of the shaft portion of the male metal object is formed by a circumferential groove having a depth for accommodating the inner end side of the sphere.   The storage hole formed in the receiving part of the female insert is positioned on the receiving side of the hole edge positioned on the receiving side, rather than the groove edge positioned on the receiving side in the circumferential groove of the receiving part. The joint member of the precast segment according to claim 3, wherein the joint member is formed to be

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