JP2001098893A - Connecting fittings for concrete segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide connecting fittings for concrete segments/capable of withstanding shearing force acting on both the concrete segments and further capable of reducing weight and cost for second connecting fittings. SOLUTION: This comprises a first connecting fittings K1 equipped with a bolt inserting hole 1, a bolt and a second connecting fittings K2 equipped with a female screw portions 2, a cap nut portion 6 of the second connecting fittings K2 is equipped with an inner side portion 8 bigger than an anchor portion 7 and, an end face side portion 9 bigger than the inner side portion 8, a reinforcing rib 11 receiving and supporting a shearing force acting to both the concrete segments is projected out from the inner side portion 8 to the outer side, and in a state where there is no sticking from the biggest portion 9a of a portion at the end face side to the outer side, it continues from the connecting place 13 between the inner side portion and the anchor portion and the connecting fittings for concrete segment which extends along the axial core direction of the female screw portion 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a first connection fitting provided with a bolt insertion hole and buried in a connection end face of one concrete segment, a bolt inserted into the bolt insertion hole, and a bolt. With a female screw part to be screwed in,
A second connection fitting embedded in a connection end face side of the other concrete segment, wherein the second connection fitting includes the female screw portion and is exposed along a connection end face of the other concrete segment. And an anchor portion connected to the cap nut portion and located inside the other concrete segment.

[0002]

2. Description of the Related Art A connector disclosed in, for example, Japanese Patent Application Laid-Open No. 10-176490 is known as such a connector for a concrete segment. As shown in FIG. 5, in the conventional connecting tool disclosed in this publication, the cap nut portion 6A of the second connecting metal fitting K2 is formed in a cylindrical shape having a considerably larger diameter than the cylindrical anchor portion 7A. The female nut portion 2A is provided on the cap nut portion 6A, and a pair of reinforcing ribs 11A for receiving and supporting the shearing force acting between the connected concrete segments are provided on the left and right sides in a state of protruding outward from the cap nut portion 6A. And a pair of reinforcing ribs 1
1A is extended along the axial direction of the female screw portion 2A in a state where it is continuous from the connection portion 13A of the cap nut portion 6A and the anchor portion 7A to the end face of the cap nut portion 6A.

[0003]

Therefore, in the above-mentioned conventional connecting device, when a shearing force acts between both concrete segments in a state where both concrete segments are connected, the shearing force is applied to the reinforcing rib 11A. It will be distributed and received and supported, and the second
Although there is little danger of the concrete segment being destroyed by the connecting fitting, it is possible to resist the shear force acting between the two concrete segments, but there is still room for improvement.

That is, the cap nut portion 6A of the second connection fitting K2 is formed in a columnar shape having a considerably larger diameter than the columnar anchor portion 7A, and the female screw portion 2A is provided in the cap nut portion 6A. However, the thickness of the cap nut portion 6A is inevitably increased, and the amount of members constituting the second connection fitting K2 is increased, resulting in an increase in cost and an increase in weight. In particular, when a frusto-conical hole or the like for guiding a bolt is provided on the inlet side of the female screw portion 2A in order to facilitate the screwing of the bolt into the female screw portion 2A, the frusto-conical hole is larger than the female screw portion 2A. Because the diameter is also large, the thickness of the cap nut portion 6A is further increased by that much,
There is a disadvantage that the cost and weight are further increased, and there is room for improvement in this point.

[0005] The present invention solves such a conventional disadvantage, and its object is to be able to resist the shearing force acting between the two concrete segments, and to constitute the second connecting fitting. It is an object of the present invention to provide a concrete segment connector capable of reducing the cost and weight by minimizing the amount of members.

[0006]

Means for Solving the Problems The constitution of the invention of claim 1 is, as shown in FIGS. 1 to 3, provided with a bolt insertion hole 1 and provided on the connection end face side of one concrete segment S1. It is provided with a first connection fitting K1 to be embedded, a bolt B inserted into the bolt insertion hole 1, and a female screw portion 2 screwed with the bolt B, and is embedded on the connection end face side of the other concrete segment S2. A second connecting metal fitting K2, wherein the second connecting metal fitting K2 includes the female screw portion 2 and is exposed along the connecting end face of the other concrete segment S2; And the other concrete segment S2
And an anchor part 7 located inward of the concrete segment, wherein the cap nut part 6 is thicker than the anchor part 7 and is connected to the anchor part 7. An inner part 8 and the inner part 8
The first concrete segment S1 and the other concrete segment S2 in a state where the one concrete segment S1 and the other concrete segment S2 are connected to each other. Reinforcing ribs 11 that receive and support the shear force acting between them,
It is provided in a state where it protrudes outward from the inner side portion 8 and does not protrude outward than the thickest portion 9a of the end surface side portion 9, and is formed between the inner side portion 8 and the anchor portion 7. The portion extends from the connecting portion 13 to the connecting portion 14 of the inner portion 8 and the end surface portion 9 along the axial direction of the female screw portion 2 in a state of being continuous.

The characteristic structure of the invention according to claim 2 is shown in FIGS.
As illustrated in FIG. 1, in a state where the one concrete segment S1 and the other concrete segment S2 are connected, the auxiliary reinforcing rib 1 for receiving and supporting the shear force acting between the concrete segments S1 and S2.
2 extends in the axial direction of the female screw portion 2 so as to protrude outward from the end face side portion 9 beyond the thickest portion 9a.

[0008] The characteristic structure of the invention of claim 3 is shown in Figs.
As illustrated in the example, the end face side portion 9 is formed in a truncated cone shape having a larger diameter as the connection end face side of the other concrete segment S2 and a smaller diameter as the inner side portion 8 is formed. The end face side portion is provided with a concave portion 10 to be fitted with the tapered convex portion 3 provided on the first connection fitting K1.

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

According to the first aspect of the present invention, the cap nut portion of the second connection fitting is thicker than the anchor portion, and the inner side portion connected to the anchor portion. And an end face side portion which is thicker than the inner side portion and is provided continuously with the inner side portion, so that, for example, a bolt is screwed into a female screw portion provided in the cap nut portion. In order to make it easier, for example, when a hole for guiding a bolt is provided on the inlet side of the female screw portion, it can be provided on the end face side portion. The end surface side portion is thicker than the inner side portion connected to the anchor portion, so that a bolt guiding hole or the like having a relatively large opening portion is provided so that the bolt guiding operation can be reliably performed. It is possible, but the inner part connected to the end face side part is thinner than the end face side part,
The thickness of the entire cap nut portion including the end face side portion and the inner side portion can be reduced, and the amount of members constituting the second connection fitting can be reduced as much as possible to achieve cost reduction and weight reduction. it can.

As described above, when the cap nut portion is constituted by the end face side portion and the inner side portion having different thicknesses, when a shear force acts between the two concrete segments in a state where both concrete segments are connected, the end face portion is formed. The concentration of stress will occur at the connecting portion between the side portion and the inner side portion, and the same stress concentration will also occur at the connecting portion between the inner side portion and the anchor portion. However, a reinforcing rib for receiving and supporting the shearing force acting between the two concrete segments is provided so as to protrude outward from the inner side portion, and does not protrude outward than the thickest portion of the end face side portion. And, in a state where it is continuous from the connecting portion of the inner side portion and the anchor portion to the connecting portion of the inner side portion and the end surface side portion, and is extended along the axial direction of the female screw portion. In addition to the support function of receiving the shearing force, the reinforcing ribs provide the stress at the connecting part between the inner part and the anchor part and at the connecting part between the inner part and the end face part. Of the concrete segment by the second connecting fitting against the shearing force acting between the concrete segments while reducing the cost and weight as described above. Destruction of It is possible to prevent.

According to the characteristic feature of the second aspect of the present invention, the auxiliary reinforcing rib for receiving and supporting the shearing force acting between the concrete segments projects outward from the end face side portion beyond the thickest portion. In this state, since the female screw portion extends along the axial direction, that is, in addition to the above-described reinforcing rib, an auxiliary reinforcing rib is further provided on the end face side portion. The shearing force acting between the concrete segments can be dispersed and received and supported by the reinforcing ribs and the auxiliary reinforcing ribs, and the shearing force can be more reliably and strongly countered.

[0013] According to a characteristic feature of the invention of claim 3, the end face side portion is formed in a frusto-conical shape having a larger diameter toward the connection end face side of the other concrete segment and a smaller diameter toward the inner side. The truncated conical end face side portion is provided with a concave portion to be fitted with the tapered convex portion provided on the first connection fitting, so that the projection provided on the first connection fitting and the second connection fitting are provided. When the two concrete segments are connected with each other, the positional relationship between the two concrete segments can be easily and reliably set to a desired position when the two concrete segments are connected to each other. When the two concrete segments are set at desired positions, the bolt insertion hole of the first connection fitting and the female screw portion of the second connection fitting have a substantially identical positional relationship,
Therefore, the screwing work of the bolt becomes easy,
In a state where both concrete segments are connected, the projection of the first connection fitting enters the recess of the second connection fitting, so that the projection and the recess also oppose the shearing force.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a concrete segment connecting tool according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, this connection tool is embedded in a first connection metal fitting K1 buried on the connection end face side of one concrete segment S1 and is embedded in a connection end face side of the other concrete segment S2. Second fitting K made by casting
2 and the first connection fitting K1 includes a connection bolt B
A bolt insertion hole 1 through which the bolt B is screwed is provided, and a female screw portion 2 into which the bolt B is screwed is provided in the second connection fitting K2, and the first and second connection fittings K1, K2 and the bolt are provided. B and the like.

A tapered frusto-conical projection 3 projecting from the connection end face of one concrete segment S1 is integrally provided at the center of the first connection fitting K1. The bolt insertion hole 1 is provided at the center of the convex portion 3, and a rod-shaped anchor 4 is screwed to the left and right thereof, and the pair of left and right rod-shaped anchors 4 is also embedded in the concrete segment S1. When embedding the first connection fitting K1 in the concrete segment S1, the core is located on the back side of the first connection fitting K1 to harden the concrete, whereby the bolt B is provided on the back side of the first connection fitting K1. A work space 5 for inserting and screwing is formed.

The second connecting metal fitting K2 has a cap nut portion 6 exposed along the connecting end face of the other concrete segment S2, and a column connected to the cap nut portion 6 and located inside the concrete segment S2. Shaped anchor part 7
It is composed of The cap nut portion 6 is thicker than the anchor portion 7, that is, has a larger diameter than the anchor portion 7, and has a cylindrical inner portion 8 connected to the anchor portion 7.
And an end face portion 9 which is thicker than the inner portion 8, that is, has a larger diameter than the inner portion 8, and is connected to the inner portion 8.

The end surface portion 9 has a frusto-conical shape having a larger diameter on the connection end surface side of the other concrete segment S2 and a smaller diameter on the inner side portion, and the thickest portion, that is, the largest portion. The diameter portion 9a is configured to be exposed at the connection end face of the other concrete segment S2. The end face side portion 9 is provided with a frusto-conical concave portion 10 that fits into the tapered frusto-conical convex portion 3 provided on the first connection fitting K1. In a state communicating with the recess 10, it is provided from the middle part of the end face side part 9 to the middle part of the inner side part 8.

In the state where one concrete segment S1 and the other concrete segment S2 are connected to each other, the second connecting fitting K2 has a reinforcing rib for receiving and supporting a shear force acting between the concrete segments S1 and S2. Is provided. The reinforcing ribs become the reinforcing ribs 11 and the auxiliary reinforcing ribs 12. The reinforcing ribs 11 protrude outward from the inner side portion 8 of the cap nut portion 6, and form the end face side portion 9. Largest diameter part 9a
From the connecting portion 13 between the inner portion 8 and the anchor portion 7 to the connecting portion 14 between the inner portion 8 and the end face portion 9. And extends along the axial direction of the female screw portion 2.

On the other hand, the auxiliary reinforcing ribs 12 protrude outward from the end surface side portion 9 of the cap nut portion 6, that is, are further outward than the largest diameter portion 9a of the end surface side portion 9. The female screw portion 2 is provided along the axial direction of the female screw portion 2. In the 10 concave portions corresponding to the pair of left and right auxiliary reinforcing ribs 12,
A pair of notches 15 are provided, and the notches 15
However, when the second connection fitting K2 is embedded in the concrete segment S2, it is configured to be used to stop the rotation of the second connection fitting K2.

In order to increase the pull-out resistance of the second connecting fitting K2 to the concrete segment S2, a plurality of flanges 16 are integrally provided along the longitudinal direction of the anchor portion 7, and A plate portion 17 is also provided integrally at the end, and furthermore, an anchor portion 7 is provided.
In order to reinforce, a pair of reinforcing strips 18 are also provided integrally.

In order to connect the two concrete segments S1 and S2 using the connecting tool having the above-described structure,
First, the convex portions 3 provided on the first connection metal fitting K1 are inserted into the concave portions 10 provided on the second connection metal fitting K2 to be fitted to each other. In this state, both concrete segments S
1, S2 and the two connecting fittings K1, K2 are set at desired positions with respect to each other, and the bolt insertion hole 1 of the first connecting fitting K1 is
The positional relationship coincides with the female screw portion 2 of the second connection fitting K2. Therefore, if the bolt B is inserted into the bolt insertion hole 1 by utilizing the space 5 on the back side of the first connection fitting K1, the tip of the bolt B will be located corresponding to the female screw portion 2,
The screwing operation of the bolt B with the female screw portion 2 can be easily performed. And both concrete segments S1,
In a state where S2 is connected, the pair of reinforcing ribs 11 and the auxiliary reinforcing ribs 12 are connected to both concrete segments S1 and S2.
The projection 3 and the recess 10 fitted to each other also oppose the shear force while being positioned in a direction orthogonal to the direction of the action of the shear force acting on 2 and opposing the shear force.

[Another Embodiment] (1) Next, another embodiment will be described with reference to FIG. 4. However, in order to avoid redundant description, the same components and components having the same functions as those of the previous embodiment will be described. , The description is omitted by attaching the same reference numerals, and mainly the configuration different from the previous embodiment will be described. In the previous embodiment, in order to receive and support the shearing force acting between the concrete segments S1 and S2, the reinforcing rib 11 is provided on the inner side portion 8 of the cap nut portion 6, and the end face portion 9 of the cap nut portion 6 is provided. In this embodiment, the reinforcing ribs 11 project outward from the inner side portion 8 and have the largest diameter portion of the end face side portion 9. A pair of reinforcing ribs 11 are provided on the left and right sides so as not to protrude outward from the inner side portion 8 and the end face side portion 9 from the continuous portion 13 between the inner side portion 8 and the anchor portion 7. In the state in which it extends to the connecting point 14 with the female thread portion 2 only along the axial direction of the female screw portion 2, a component corresponding to the auxiliary reinforcing rib 12 in the previous embodiment is provided. Absent. However, also in this alternative embodiment, since the pair of reinforcing ribs 11 are located in a direction orthogonal to the direction of action of the shear force acting on both the concrete segments S1 and S2, although being somewhat inferior to the previous embodiment, , Can sufficiently resist the shearing force.

(2) In the embodiments described above, the example in which the reinforcing ribs 11 are provided in a pair on the left and right is shown.
1 can also be implemented by being provided on only one of the left and right sides. Also, in the case where an auxiliary reinforcing rib 12 is provided in addition to the reinforcing rib 11, the auxiliary reinforcing rib 1 may be provided.
2 may be provided only on one of the left and right sides.

(3) In the embodiments described above, the first connection fitting K1 is provided with the tapered convex portion 3, and the second connection fitting K2 is provided.
Although the example in which the concave portion 10 that fits with the convex portion 3 is provided is shown in the figure, the convex portion 3 and the concave portion 10 are not necessarily required. You can also. Further, the first connection fitting K1 is not provided with the convex portion 3, and the end face side portion 9 of the second connection fitting K2 is located on the inlet side of the female screw portion 2 and has a frusto-conical shape communicating with the female screw portion 2. A concave hole may be provided, and the bolt B may be guided to the female screw portion 2 by the concave hole.

(4) In the above embodiments, the inner portion 8 of the cap nut portion 6 and the anchor portion 7 are formed in a cylindrical shape. However, the inner portion 8 and the anchor portion 7 are formed in a cylindrical shape. Various modifications are possible, such as forming one or both of them into a polygonal column shape such as a quadrangle, or configuring them into an elliptical column shape. Also, the end surface side portion 9 of the cap nut 6 is not limited to a truncated cone, and various modifications such as a columnar configuration or a polygonal columnar configuration are possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a connector for a concrete segment.

FIG. 2 is a cross-sectional view of a connector for a concrete segment.

FIG. 3 is a perspective view of a connector for a concrete segment.

FIG. 4 is a perspective view of a concrete segment connector according to another embodiment.

FIG. 5 is a perspective view showing a conventional concrete segment connector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bolt insertion hole 2 Female screw part 3 Convex part 6 Cap nut part 7 Anchor part 8 Inner side part 9 End face side part 9a Thickest part of end face side part 10 Depression 11 Reinforcement rib 12 Auxiliary reinforcement rib 13 Inner side part Connected place with anchor part 14 Connected place between inner side part and end face side part B Bolt K1 First connection fitting K2 Second connection fitting S1 One concrete segment S2 The other concrete segment

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayoshi Tsuchiya 7-12-22 Minamienkajima, Taisho-ku, Osaka-shi, Osaka Inside the Kubota Enkajima Plant (72) Inventor Tomoyuki Nomura 3 Nihonbashi Muromachi, Chuo-ku, Tokyo 1-3-3, Kubota Tokyo Head Office F-term (reference) 2D055 GC02 KA00

Claims (3)

[Claims] A first connection fitting provided with a bolt insertion hole and buried in a connection end face side of one concrete segment; a bolt inserted into the bolt insertion hole; and a female screw portion screwed with the bolt. And a second connection fitting embedded in the connection end face side of the other concrete segment, wherein the second connection fitting includes the female screw portion and is exposed along the connection end face of the other concrete segment. A concrete segment connecting device comprising a cap nut portion and an anchor portion connected to the cap nut portion and located inside the other concrete segment, wherein the cap nut portion includes the anchor. Thicker than the part and
An inner side portion connected to the anchor portion, a thicker than the inner side portion, and an end surface side portion connected to the inner side portion, the one concrete segment and the other In a state where the concrete segments are connected to each other, a reinforcing rib for receiving and supporting a shear force acting between the concrete segments projects outward from the inner side portion, and is larger than the thickest portion of the end face side portion. The female screw is provided so as not to protrude outward, and is continuous from a connecting portion between the inner portion and the anchor portion to a connecting portion between the inner portion and the end surface portion. Connector for concrete segments extending along the axial direction of the section. 2. An auxiliary reinforcing rib for receiving and supporting a shear force acting between both concrete segments in a state where the one concrete segment and the other concrete segment are connected to each other. 2. The concrete segment connector according to claim 1, wherein the connector extends along the axial direction of the female screw portion so as to protrude outward from the portion. 3. 3. The frusto-conical end-face portion is configured such that the diameter of the end-face portion is larger at the connection end face side of the other concrete segment and smaller at the inner-side portion. 3. The concrete segment connecting tool according to claim 1, further comprising a concave portion that fits with the tapered convex portion provided on the first connecting metal member. 4.