JP2001214694A - Cotter joint device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance tightening strength by preventing the looseness and slipping-off of a cotter tightening a segment, various concrete members and the like. SOLUTION: In a cotter joint device wherein C-shaped joint fittings 11, 11 having a cross sectional lip channel type slot 12 are opposed to insert a cross sectional H-shaped cotter 16 into the slots 12, 12 incorporated mutually in the form of a cross sectional H-shape, bolt holes 22, 22 are drilled in the neighborhood of the center part of the right and left flange parts 19, 19 of the cross sectional H-shaped cotter 16. In addition, bottom face parts 12a, 12a having prescribed thickness are formed on the C-shaped joint fittings 11, 11, and the locking part 23 of bolts 21, 21 inserted in the bolt holes 22, 22 is provided on the bottom face parts 12a, 12a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cotter type joint device, and more particularly to a cotter type joint device for fastening a primary lining segment of a shield tunnel or various concrete members.

[0002]

2. Description of the Related Art Conventionally, as a coupling device for fastening segments for tunnel lining, a C-type coupling fitting having a lip-groove-shaped cross section is opposed to each other, and a cross section H is formed into a H-shaped slot. There is a cotter type coupling device for inserting and fastening a mold cotter.

[0003] The cotter type joint device is provided with a tapered surface that opens forward toward the tip at an inner surface of a flange of an H-type cotter and a step portion of a slot of a C-type fitting which comes into contact with the inner surface. Insert the cotter into the slot in the mold fitting
The joints are fastened to each other and formed so that the cotter does not easily come off due to the frictional force between the inner surface of the flange of the cotter and the step of the slot of the C-joint.

[0004]

In the conventional cotter type joint device, the C type fittings are fastened to each other by a frictional force between the inner surface of the flange of the H type cotter and the step of the slot of the C type fitting. Therefore, when a shearing force greater than the vibration or the fastening force acts on the member or the like fastened by the cotter type joint device,
The cotter becomes loose, and there is a risk that the cotter comes off from the C-type fitting.

[0005] Therefore, loosening and coming off of the cotter are surely prevented to increase the fastening strength between the individual members,
The technical problem to be solved arises in order to obtain a cotter type joint device which enables the design as a continuous member, and an object of the present invention is to solve the problem.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above object, and has a C-shaped fitting having a lip-groove-shaped cross-section, facing each other, and merging into an H-shape. In a cotter type coupling device for inserting and fastening an H-shaped cotter into the grooved hole, a bolt hole is formed near the center of the left and right flanges of the H-shaped cotter,
A bottom portion having a predetermined thickness is formed in the C-type fitting, and a cotter type coupling device in which a locking portion for a bolt to be inserted into the bolt hole is provided on the bottom portion, and a locking portion for the bolt, A cotter-type joint device in which an elliptical spherical nut is embedded in a bottom surface portion, and right and left flange portions of the cotter having the H-shaped cross section, wherein side portions orthogonal to the longitudinal direction of the cotter are predetermined from an upper surface of the cotter. A cotter-type joint device in which a step is provided at a position where the thickness of the joint is formed, and the lower side of the step is formed near the center of a bolt hole; and the C-type fitting is provided behind the C-type fitting. A cotter-type joint device having a rod-shaped anchor having a predetermined length integrally formed with the anchor and a supporting portion provided at a rear end of the anchor; Direction at predetermined intervals. There is provided a cotter-type coupling device provided with.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. FIG. 1 shows a C-shaped joint fitting 11 and a cotter 16 having an H-shaped cross section for joining concrete precast plates 1 and 1 laid on a roadbed G.
The concrete precast plate 1 is used for pavement in a wide place such as an airport parking lot, a taxiway, and the like. A truss reinforcing bar (not shown) is arranged inside the concrete precast plate 1 in order to enhance the deformation performance. 2 is a high-strength reinforced concrete precast slab manufactured by casting a rectangular plate having a length of 7.5 m in a longitudinal direction and a width of 3.5 m in consideration of, for example, transportation to a construction site. And a thickness of about 0.2 m.

The concrete precast plates 1, 1 ...
As shown in FIG. 4, four sides 1a, 1a, 1a, 1a of the four sides of the concrete precast plate 1 in plan view are adjacent to the sides 1a, 1a, 1 of the concrete precast plate 1.
a, 1a and a gap 32 having a predetermined width is provided continuously, and each concrete precast plate 1,
One is connected to each other to increase the unity and to enable the design as a continuous plate. At this time, the C-shaped joint fittings 11, 11,... Are installed in the longitudinal direction of the concrete precast plate 1, for example, at 750 mm intervals and 700 mm in the width direction, and the cotter 16 is placed between the C-shaped joint fittings 11, 11. And the concrete precast plates 1 and 1 are fastened to each other. When the laid concrete precast plate 1 is partially replaced, the concrete precast plate 1 can be quickly replaced by removing the cotter 16.

Next, the C-shaped fittings 11, 11 and the cotter 16 will be described with reference to FIGS. 1 (a) and 1 (b). The C
The mold fitting 11 is formed so as to have a slot 12 having a C-shaped cross section.
A cotter 16 having an H-shaped cross section is vertically inserted into the slots 12 and 12 that have been combined into a mold shape, and the concrete precast plates 1 and 1 are joined to each other. The cam lips 14, 14 of the C-type fitting 11 have inner surfaces 15, 15 on which the cotter 1 is attached.
6 from the upper surface of the concrete precast plate 1 in the insertion direction to the lower surface, a tapered surface inclined in a direction away from the outer surfaces 13, 13 of the cam lips 14, 14 in which the C-shaped fittings 11, 11 face each other. I do.

Further, a bottom portion 12a having a predetermined thickness is formed horizontally below the C-shaped joint fittings 11,11.
A screw portion 23 for screwing a tip portion of a bolt 21 for fixing the cotter 16 to the C-type fitting 11 is formed in the slot 12 side of the bottom portion 12a. An engaging portion is provided. As described above, the cotter 16
In a state where the mold fittings 11 are opposed to each other, they are formed into an H-shaped section which can be inserted into the opposed slots 12, 12, and the inner surfaces 18 of the left and right flange portions 19, 19 of the web 20. 18, 18, 18 the C-type fittings 11, 1
1 and the outer surfaces 17, 17 of the flange portions 19, 19 at the same taper angle as the tapered surfaces of the inner surfaces 15, 15 of the cam lips 14, 14 from the upper surface to the lower surface of the concrete precast plate 1 in the insertion direction. To form a tapered surface that is inclined in a direction approaching. In the vicinity of the center of the flange portion 19 of the cotter 16, a bolt 21 for vertically inserting the bolt 21 for fixing the cotter 16 to the bottom surface 12a of the C-shaped fitting 11 as described above. Hole 2
Drill 2

In the above construction, when the concrete precast plates 1, 1 are opposed to each other, the C-shaped joint fittings 11, 11 are also opposed to each other, and the C-shaped joint fittings 11, 11 are opposed to each other. The cotter 16 is vertically inserted into the slots 12, 12, and the cam lip 1 of the C-type fittings 11, 11 is inserted.
4 and 14 are fastened by the flange portions 19 and 19 of the cotter 16, and the bolt 2
The concrete precast plates 1 and 1 are securely connected to each other through the cotter 16 by inserting them into the screw portions 23 of the bottom surface portion 12a of the C-shaped joint fittings 11 and 11, respectively.

The upper surface of the C-shaped fitting 11 is attached to the concrete casting surface 1c at a position lower than the upper surface of the concrete precast plate 1 by a predetermined height (in this case, 25 mm) in a direction perpendicular to the lower surface. At the same time as the horizontal height, the outer surfaces 13,
A predetermined gap 32 (in this case, 70 mm) is provided between the members 13, and the back surface thereof is fixed to the anchor reinforcing bars 3, 3. Further, the casting surfaces 1c, 1c
In consideration of the workability for rotating the bolts 21 and 21, etc., the C-shaped fittings 11 and 11 are formed slightly larger than the rear surface of the fittings.

Further, a portion of the concrete precast plates 1, 1 between the lower surfaces of the C-shaped joint fittings 11, 11 and the roadbed G where the side portions 1a, 1a face each other is provided with a predetermined gap 32 (this 7 mm) and the roadbed G
In the vicinity of the side, in order to dispose a waterproof rubber 49 between the sides 1a, a concave portion is formed in which the sides 1a are widened. After the concrete precast plates 1 and 1 are joined together, the upper surface 1c of the C-shaped joint fittings 11 and 11 and the upper surface of the concrete precast plate 1 are flush with the upper surface of the concrete precast plate 1. Install a lid or fill the non-shrink mortar to protect the joint. Non-shrink mortar is also filled in the gap 32 between the side portions 1a, 1a of the concrete precast plate 1. When the side portion 1a is tapered in order to smoothly flow rainwater after laying the concrete precast plate 1 or to quickly replace the concrete precast plate 1, the C Attach the mold fitting 11 to the side 1
It is installed perpendicular to the tapered surface of a.

Next, a second embodiment will be described with reference to FIGS. Since this is basically the same as the first embodiment, the description of the common parts will be omitted. An elliptical hole 25 for attaching an elliptical spherical nut 24 for locking the tip of the bolt 21 is formed in the bottom surface portion 12a of the C-shaped fitting 11. The hole 2
As shown in FIG. 3 (b), 5 has a sectional shape smaller on the upper surface side of the bottom portion 12a than the outer diameter of the spherical nut 24,
In addition, the hole 26 is formed by a short vertical hole 26 and a bell-shaped hole 27 facing the lower surface.

The lower portion of the C-shaped fitting 11 is inserted into the hole 25 so that the upper surface of the spherical nut 24 on the screw portion 23 side is in contact with the intersection of the hole 26 and the hole 27 in the bottom portion 12a. After the spherical nut 24 is inserted, the hole 25 is filled with urethane resin 28 so that the spherical nut 24 is
Buried inside. The spherical nut 24 is made of the urethane resin 2
8, the ball 21 is fixed to the cotter 16 due to the flexibility of the urethane resin 28. When the bolt 21 is inserted from above, the spherical nut 24
The screw 23 is easily screwed because it slightly follows the tip of the cotter, and the cotter 16 can be easily fixed. The spherical nut 24 is formed in an elliptical shape because the bolt 21 does not rotate together with the spherical nut 24, and the spherical nut 24 may be formed in a square shape. Furthermore, the tip of the bolt 21 drops the outer corner,
It is easy to screw into the spherical nut 24.

Next, the cotter 16 and the bolt 21 will be described with reference to FIG. If the length of the bolt 21 for fixing the cotter 16 is long and the play of the bolt hole 22 in the cotter 16 is small, the C
Screwing with the mold fitting 11 is difficult. Therefore, together with the embedding of the spherical nut 24 which can be moved as described above, the bolt 21 is provided under the flange portion 19 of the cotter 16.
A part of the cotter 16 for restraining the movement of the bolt 21 is cut out so that the movement of the bolt 21 has a certain degree of freedom.
To facilitate fixing. In the flange portion 19 of the left and right cotters 16, a side portion 17 orthogonal to the longitudinal direction of the cotter 16 is provided with a step 16b at a position where a predetermined thickness is formed from the upper surface 16a of the cotter 16, Step 1
A lower side portion 16c continuous with 6b is formed near the center of the bolt hole 22.

Therefore, the flange portion 1 of the cotter 16
9 is drilled in the vicinity of the center of the bolt 9 and the bolt 2
1 is inserted, the bolt 21 is supported on the entire circumference of the bolt hole 22 above the stepped portion 16b, but below the stepped portion 16b, the side portion 16c of the cotter 16 is connected to the C-shaped joint fitting. Since a space is formed between the slot 11 and the slot 12, the degree of freedom in the movement of the tip of the bolt 21 is increased. Also, the step 16b is connected to the upper surface 16a of the cotter 16.
Another reason why the cotter 16 is provided at a position having a predetermined thickness is to easily remove the cotter 16 when partially replacing the laid concrete precast plate 1.

In the replacement method, first, after removing the bolt 21 by reverse rotation, a lock pin (not shown) is inserted into the bolt hole 22 to pull out the cotter 16 upward. The lock pin has a blade-like member attached to the tip, and when inserted from above, the blade is closed so that it can pass through the bolt hole 22, and after the step 16b, the blade is spread. belongs to. By raising the lock pin, the step 16b of the cotter 16 can be lifted by the blade and the cotter 16 can be removed. The position of the step is determined by the design of the cotter.

Next, a third embodiment will be described with reference to FIGS. FIG. 5A is a plan view of the C-shaped joint fitting 33, and FIG. 5B is a side view thereof. The C-shaped fitting 33 is formed so as to have a slot 37 having a C-shaped cross section.
The H-shaped cotter 5 described later is inserted into the slots 37, 37 in which the mold fittings 33, 33 are opposed to each other and merged into an H-shape.
0 is inserted vertically to connect concrete precast plates 30, 30 described later.

The cam lips 39, 3 of the C-type fitting bracket 33
9, as shown in FIG. 5 (b), the C-shaped joint fittings 33, 33 extend from the upper surface 34 to the lower surface 36 of the C-shaped joint fitting 33 on the inner surfaces 40, 40 in the insertion direction of the cotter 50.
Outer surfaces 35, 3 of the cam lips 39, 39 facing each other
A tapered surface inclined in a direction away from 5 is formed.

Further, a bottom portion 38 having a predetermined thickness is formed horizontally below the C-shaped fittings 33, 33.
Further, the tip of a bolt 55 for fixing the cotter 50 to the C-type fitting 33 as described later is screwed from the slot 37 side of the bottom surface 38 toward the lower surface 36 of the C-type fitting 33 as described later. A screw portion 41 for engagement is cut and the bolt 5
5 locking portions are provided.

Further, as shown in FIG. 5 (a), the C-shaped joint fitting 33 is formed on a rearward extension line of the C-shaped joint fitting 33 in a direction perpendicular to the outer surface 35 of the C-shaped joint fitting 33. A rod-shaped anchor 43 having a predetermined length integrally formed is provided. The anchor 43 is made of a material having a tensile strength, a shear strength and a bending strength equal to or higher than that of the cotter 50, and is constituted by a single thick rod.

The mounting portion of the anchor 43 on the side surface of the C-type fitting 33 is eccentric to the lower surface 36 from the center of the side surface of the C-type fitting 33 as shown in FIG. Formed at a right angle from the bent position. Further, a disk-shaped bearing portion 44 having a predetermined thickness is provided at the rear end of the anchor 43. By providing the supporting portion 44, not the adhesion resistance to the concrete 2 described later but the cone shear resistance of the concrete 2 can be used, and the anchor 43 can be used.
Can be shortened. When the reinforcing bars in the concrete precast plate 30 are converging,
Since it acts in the direction of reinforcing the cone shear fracture surface, the proof stress is further increased.

The C-type fitting 33 and the anchor 43
And the connecting portion 45 between the anchor 43 and the bearing portion 44 are connected with a smooth curved surface so that the load can be smoothly transmitted. Further, ribs 42, 42, 42 are provided at predetermined intervals in the outer peripheral vertical direction of the C-shaped joint fitting 33 so as to increase the shear resistance and the adhesion to the concrete 2. Further, circumferential ribs 47 are provided at predetermined intervals also in the horizontal direction of the outer periphery of the anchor 43, and the circumferential ribs 4
.. Are also provided between 7, 47 to increase the adhesion of the concrete C2.

Next, the cotter 50 will be described with reference to FIG. As shown in FIG. 6 (a), the cotter 50 is formed in an H-shaped cross-section which can be inserted into the opposed slots 37, with the C-shaped fittings 33, 33 facing each other. , The left and right flange portions 51 of the web 52
C-type fittings 33, 53 on the inner surfaces 53, 53, 53, 53 of
At the same taper angle as the tapered surfaces of the inner surfaces 40, 40 of the cam lip 39, the flanges 51, 33 from the upper surface 50a to the lower surface 50e of the cotter 50 as shown in FIG. 51 sides 50b, 50d
To form a tapered surface that is inclined in a direction approaching.

In the vicinity of the center of the flange portion 51 of the cotter 50, the bolt 55 for fixing the cotter 50 to the bottom portion 38 of the C-shaped fitting 33 is vertically inserted as described above. Bolt holes 54 are formed. Further, left and right flange portions 51, 5 of the cotter 50 are provided.
1, a side portion 50b orthogonal to the longitudinal direction of the cotter 50 is provided with a step 50c at a position where a predetermined thickness is formed from the upper surface 50a of the cotter 50, and a lower side continuous with the step 50c. The portion 50d is formed near the center of the bolt hole 54.

Next, the connection between the concrete precast plates 30, 30 will be described with reference to FIG. First, the mounting position of the upper surface 34 of the C-type joint fitting 33 is determined by the horizontal height of the concrete casting surface 30c provided at a position lower by a predetermined height (25 mm) in the direction perpendicular to the upper surface of the concrete precast plate 30. At the same time, a predetermined gap 32 (70 mm) is provided between the outer surfaces 35, 35 of the C-shaped fittings 33, 33, and the lower surfaces 36, 36 of the C-shaped fittings 33, 33 are formed of the concrete precast. The plate 30 is buried in the concrete 2 at a predetermined interval (20 mm) from the lower surface. The concrete casting surfaces 30c, 30c are formed slightly larger than the rear surfaces of the C-shaped fittings 33, 33 in consideration of workability for rotating the bolts 55, 55 and the like. Also, the side portions 30a, 30 of the adjacent concrete precast plates 30, 30,
In the portion where the a faces each other, a predetermined gap 32 (7 mm) is provided, and near the lower surface side of the concrete precast plate 30, a waterproof rubber 49 is provided between the side portions 30a.
In order to dispose, a concave portion in which the side portions 30a and 30a are widened is formed.

When the concrete precast plates 30, 30 are confronted with each other by taking a gap 32 (7 mm) of the predetermined width between the side portions 30a, 30a of the adjacent concrete precast plates 30, 30, the C-shaped mold is formed. The fittings 33 are also opposed to each other with a predetermined gap 32 (70 mm).
The cotter 50 is vertically inserted into the slots 37, 37 of the cotter 50, and the cam lips 39, 39 of the C-shaped fittings 33, 33 are inserted into the flanges 51,
51, and the bolts 55, 55 are inserted from the upper surface 50a of the cotter 50 so that the C-shaped fitting 3
The concrete precast plates 30, 30 are securely connected to each other via the cotter 50 by being screwed to the screw portions 41 of the bottom surface portions 38, 33.

When the bolt 55 is inserted into the bolt hole 54, the bolt 55 is supported on the entire circumference of the bolt hole 54 above the step portion 50c of the cotter 50. In the lower part, since the side portion 50d of the cotter 50 forms a space between the side portion 50d and the slot 37 of the C-shaped fitting 33, the degree of freedom in the movement of the tip of the bolt 55 increases, Screwing with the mold fitting 33 is facilitated. Another reason for providing the step portion 50c at a position having a predetermined thickness from the upper surface 50a of the cotter 50 is to easily remove the cotter 50 when partially replacing the laid concrete precast plate 30. .

In the replacement method, first, after the bolt 55 is rotated in the reverse direction and removed, a lock pin (not shown) is inserted into the bolt hole 54 and the cotter 50 is pulled out upward. The lock pin has a wing-shaped member attached to the tip, and when inserted from above, the wing is closed so that it can pass through the bolt hole 54, and after passing through the step 50c, the wing is spread. Things. By raising the lock pin, the cotter 50 can be removed by lifting the step 50c of the cotter 50 with the blade. The position and the like of the step portion are appropriately determined by the design of the cotter.

The concrete precast plate 3
. 0, 30... Between the upper surface 34 of the C-shaped joint fitting 33 and the upper surface of the concrete precast plate 30, a lid 56 may be placed flush with the upper surface of the concrete precast plate 30, Fill joints with non-shrink mortar to protect joints. Further, the concrete precast plate 3
The gap 32 between the 0 side portions 30a is also filled with non-shrink mortar.

Next, the laying of the concrete precast plates 30, 30,... On the roadbed will be described with reference to FIG.
The concrete precast slabs 30, 30,... Are used for pavement in a wide area such as an airport tarmac, a taxiway, etc., and truss reinforcing bars (not shown) are disposed therein to enhance deformation performance. It is a high-strength reinforced concrete precast plate manufactured by casting high-strength concrete 2,
The size is, for example, in the form of a rectangular plate having a length in the longitudinal direction of 7.5 m and a width of 3.5 m in consideration of transportation to the construction site, and a thickness of approximately 0.2 m.

The concrete precast plates 30, 30
A predetermined gap 32 (7 mm in this case) is provided between the concrete precast plates 30,
The 30s are joined together to enhance their integrity and allow for the design of a continuous plate. At that time, for example, at intervals of 750 mm in the longitudinal direction of the concrete precast plate 30,
In addition, the C-type fittings 33, 700 at intervals of 700 mm in the width direction.
Are installed, and the cotter 50 is inserted between the C-shaped fittings 33, 33 so that the concrete precast plate 3
0, 30 are fastened together.

At this time, as shown in FIG. 4, when the joints of the concrete precast plates 1, 1... Are laid so as to be aligned, the leg load of the aircraft is applied to the even corners of the concrete precast plate 1. When it is located, a large cross-sectional force is generated at the joint, and a weak point near the intersection of the joint as a plane integrated pavement.

Therefore, a half-length concrete precast plate 31 is laid on the end of the concrete precast plate 30 in the longitudinal direction so that the joints in one direction are not aligned on a straight line. By shifting to a staggered joint, the even-angle portion of the concrete precast plate 30 is prevented from concentrating at any one point on the pavement surface.

The cotter type joint device can be used for fastening a shield tunnel segment or various concrete members.

Thus, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0038]

As described above, according to the first aspect of the present invention, a bolt hole is formed near the center of the left and right flanges of the cotter, and the cotter is bolted to the bottom of the C-type fitting with the bolt. Since the cotter is locked, the cotter can be reliably prevented from coming loose.

According to a second aspect of the present invention, in addition to the effect of the first aspect of the present invention, an elliptical spherical nut is buried in the bottom surface of the C-shaped joint fitting, so that there is a degree of freedom in play at the tip of the bolt. It becomes easy to fix, and the co-rotation with the bolt can be prevented.

According to a third aspect of the present invention, in addition to the effects of the first or second aspect, a step portion is provided on the left and right flange portions of the cotter, and the lower side portion of the step portion is bolted. Since it is formed near the center of the hole, the degree of freedom in the movement of the bolt when the bolt is inserted is increased, and the work of fixing the bolt to the C-type fitting is facilitated. Further, the provision of the step makes it possible to easily remove the cotter.

According to a fourth aspect of the present invention, in addition to the effect of the first aspect of the present invention, since a rod-shaped anchor integrally formed is provided behind the C-shaped joint fitting, the transmission of stress generated in the joint portion is prevented. It can be done smoothly. In addition, since a bearing portion is provided at the rear end of the anchor, not the adhesion resistance to concrete but the cone shear resistance of concrete can be used, so that the length of the anchor can be shortened and concrete can be reduced. Filling becomes easier.

According to the fifth aspect of the present invention, in addition to the effects of the first or fourth aspect of the present invention, the ribs are provided in the outer peripheral vertical direction of the C-type fitting and the outer peripheral horizontal direction of the anchor.
The shear resistance of the C-type fitting and the adhesion to concrete can be increased.

In this way, when fastening segments and various concrete members, it is possible to reliably prevent the cotter from loosening or coming off, and to surely perform the connection at the joint portion. It is an invention.

[Brief description of the drawings]

FIG. 1A is a plan view illustrating an embodiment of the present invention, in which an H-type cotter is inserted between C-type fittings. FIG. 1B is a sectional view taken along the line II-II of FIG.

FIG. 2A is a cross-sectional view illustrating another embodiment, in which an H-type cotter is inserted between C-type fittings. FIG. 2B is a cross-sectional view of FIG.

FIG. 3A is a plan view showing a state in which a spherical nut is buried in the bottom surface of a C-type fitting. FIG. 3B is a sectional view taken along the line c-c of FIG.

FIG. 4 is a plan view showing a laid state of a concrete precast plate on which a cotter type joint device is installed.

FIG. 5A is a plan view of a C-type fitting according to still another embodiment. (B) Side view of a C-type fitting.

FIG. 6A is a plan view of an H-type cotter. (B) A view in the direction of the arrows in FIG. 6 (a).

FIG. 7 is a cross-sectional view of a concrete precast plate, in which a left side from a center line is a cross-sectional view showing a state where an H-shaped cotter is inserted between C-type fittings, and a right side from the center line is a side view of a C-type fitting. .

FIG. 8 is a plan view showing a laid state of a concrete precast plate on which a cotter type joint device is installed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 C type fitting 12 Slot 12a Bottom part 16 H-section cotter 16a Top surface 16b Step 16c Side 17 Outer surface (side) 19 Flange 21 Bolt 22 Bolt hole 23 Locking part (Screw part) 24 Spherical nut 33 C-type fitting 37 Slot groove 38 Bottom part 41 Locking part (screw part) 42, 47 Rib 43 Anchor 44 Support plate 50 H-section cotter 50a Top surface 50b Side 50c Step 50d Side 51 Flange 54 Bolt Hole 55 bolt

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 000230010 Geostar Co., Ltd. 4-2-2, Shiba, Minato-ku, Tokyo (71) Applicant 593017887 Ishida Kogyo Co., Ltd. 4453 Otani, Oji, Higashimatsuyama-shi, Saitama (72) Inventor Tanabe Chu-Hon 2-3-3-11 Wakumizu, Chikusa-ku, Nagoya-shi, Aichi D-606 (72) Inventor Hiroyasu Kitayama 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Head Office (72) Inventor Hitoshi Kawachi 2-1, Tsukudo-cho, Shinjuku-ku, Tokyo, Tokyo Kumagaya-gumi Tokyo headquarters (72) Inventor Tashiro ▲ Sho ▼ Kumagaya-gumi Tokyo headquarters, No. 2-1, Tsukudocho, Tokyo (72) Invention Person Akihiko Ito 8-27 Shin-Ogawa-cho, Shinjuku-ku, Tokyo Inside Gaiat Kumagai Co., Ltd. (72) Inventor Hideki Tanaka 4-2-2 Shiba, Minato-ku, Tokyo No. Geostar Co., Ltd. (72) Inventor Satoshi Naito 2-3-2 Shiba, Minato-ku, Tokyo Geostar Co., Ltd. (72) Inventor Kimio Ishii 4453 Oya, Oji, Higashimatsuyama-shi, Saitama F-term (Ishida Kogyo Co., Ltd.) Reference) 2D055 BA01 GC04 GC06

Claims (5)

[Claims] 1. A C-shaped joint fitting having a lip-groove-shaped cross-section is opposed to a C-shaped fitting having a cross-section H.
In a cotter type joint device for inserting and fastening a mold cotter, a bolt hole is formed near the center of the left and right flanges of the cotter having an H-shaped cross section. A cotter-type joint device, wherein a bottom portion having a thickness of 3 mm is formed, and a locking portion for a bolt inserted into the bolt hole is provided on the bottom portion. 2. The cotter-type joint device according to claim 1, wherein the locking portion of the bolt has an elliptical spherical nut embedded in a bottom surface portion. 3. The left and right flange portions of the cotter having the H-shaped cross section, and a side portion orthogonal to the longitudinal direction of the cotter is provided with a step portion at a position where a predetermined thickness is formed from the upper surface of the cotter. 3. The cotter type joint device according to claim 1, wherein the side portion below the step portion is formed near the center of the bolt hole. 4. A rod-shaped anchor having a predetermined length integrally formed with the C-type fitting and provided at the rear of the C-type fitting and a bearing portion at the rear end of the anchor. The cotter type joint device according to claim 1, wherein 5. The cotter type joint device according to claim 4, wherein ribs are provided at predetermined intervals in a direction perpendicular to the outer periphery of the C-shaped joint fitting and in a horizontal direction around the outer periphery of the anchor.