JPH0791950B2 - Joint structure of concrete members - Google Patents

Description

TECHNICAL FIELD The present invention relates to a joint structure of concrete members such as segments used in a shield construction method.

[Problems to be solved by this invention]

Conventionally, in this type of joining structure, the joining connecting metal fitting embedded in the joining end surface of the concrete member may be deformed during tightening joining with the joining bolt.

If you use a connector that can prevent this deformation,
Since it is possible to firmly bond without deformation, the concrete of the end members in the thickness direction in the vicinity of the joint bolt tightening portion on the joint end surface may come into strong contact with each other, and that portion may be damaged.

This invention was created in view of the above-mentioned circumstances, and its purpose is not to deform the joining member at the time of tightening with a connecting bolt, and to prevent the upper and lower end members in the thickness direction of the joining end surface from being damaged, It is an object of the present invention to provide a joint structure for concrete members that can be firmly joined with a simple structure.

[Means for solving problems]

According to the present invention, in the joint portion formed at the joint end portion of the concrete member, the through hole for the connecting bolt formed in the concrete member penetrating from the joint work concave portion to the joint end surface, and the joint work concave portion. And a tightening plate through which the connecting bolt is tightened.

Then, the concrete member with the joining end faces abutting each other,
By tightening through the tightening plate, the joint portion of both concrete members is prevented from being deformed. In addition, the exposed corners of the flat plate were chamfered, the chamfers were flush with the chamfers of the corners on the surface side of the joint end face of the concrete member, and the anchors embedded in the concrete were projected. By providing a plurality of reinforcing plates at required intervals and bringing exposed portions of the reinforcing plates of each concrete member to the joint end faces into contact with each other, the end portions in the thickness direction of the joint end faces near the connecting bolt tightening part are damaged. It is to prevent it.

〔Example〕

 The present invention will be described below with reference to illustrated embodiments.

The joint structure 1 for concrete members is an example in which the pair of concrete members 2, 2'to be joined are formed at the joint ends thereof. Are joined together. (See FIG. 1) Then, the one joint part 3 which is the joint part according to the first invention,
A through hole 6 for a connecting bolt 4 formed in the concrete member 2 so as to penetrate from the joining work recess 5 to the joining end face 2a;
It is provided over substantially the entire length in the depth direction of the joining work recess 5 and has a tightening plate 7 through which the connecting bolt 4 is tightened. In this embodiment, the connecting bolts 4 are arranged at two upper and lower positions.

The other joint 3'is embedded with an insert fitting 8 into which the connecting bolt 4 penetrating the through hole 6 is screwed.

Then, at the end portions in the thickness direction of both the joint portions 3 and 3 ', exposed so as to be flush with the joint end surface 2a and the surface 2b of the concrete members 2 and 2', to the concrete member joint end surface 2a. A reinforcing plate 9 is provided so that the exposed portions abut each other. The reinforcing plate 9 is flat and chamfered at the exposed corners.
9b is provided, and this chamfer is flush with the chamfer of the corners on the surface side of the end surface of the concrete member, and anchors embedded in concrete are projected, and a large number of anchors are provided at required intervals.

In addition, in order to manufacture this concrete member 2, 2 ',
It is performed by the formwork apparatus 10 as shown in the figure. To attach the reinforcing plate 9 here, attach the mounting screw 11 to the reinforcing plate 9 as shown in FIG.
It is screwed in and attached to the form plate 10a as shown in FIG. Note that reference numeral 12 in FIG. 5 is a medium frame.

In manufacturing the concrete members 2 and 2 ', since the recess 5 for joining work is provided receding from the joining end face 2a of the concrete member 2, it is embedded in the joining end face forming the joining portion 3 for reinforcement. It is possible to bury the main bar for the joint without cutting it. Therefore, the yield strength of the concrete member can be increased.

In addition, the recess 5 for joining work is provided so as to be retracted from the joining end face, because the joint fitting is not exposed to the joining end surface, the sealing groove is free to the joining end surface without being restricted by the joining fitting. Can be provided in the. Therefore, the water blocking effect in the joint portion 3 can be enhanced.

Furthermore, the fact that the joint fitting is not exposed on the joint end surface means that the concrete does not leak into the recess for joining work so that it will pass through the gap formed at the contact point between the joint fitting and concrete. Can manufacture wood.

Concrete member joining structure 1 having such a configuration
To connect both concrete members 2, 2'by
First, the joint end faces 2a, 2a 'of both concrete members 2, 2'are brought into contact with each other. And at this time, each concrete member 2, 2 '
The exposed portions of the reinforcing plate 9 exposed on the joint end surfaces 2a, 2a 'of the above contact each other.

Next, using the recess 5 for joining work, the connecting bolt 4 is passed through the through hole 6 of the one joining portion 3 and screwed into the insert metal fitting 8 of the other joining portion 3'and tightened.

When the connecting bolt 4 is screwed, as shown in FIG. 2, both screw bolts provided in the bolt insertion part 5a of the recess 5 for joining work before joining the pair of concrete members 2, 2 '. Pull out 4a when both joint end faces are in contact.

Then, the both screw bolts 4 that have been pulled out are passed through the through holes 6, and a lid-shaped cover nut 4b is screwed into one threaded portion of both screw bolts 4a to be mounted.

Next, by rotating the bolt 4a using the cover nut 4b mounted, the other screw part is screwed into the mating insert fitting 8. At this time, since both screws are cut at both ends, it can be connected without idling. After finishing the rotation, remove the cover nut 4b and tighten the washer 4c and the nut 4d.

As a result, both concrete members 2, 2'are connected and joined.

The reinforcing plate 9 may be provided at the seal portion of the concrete member 2, 2'by forming the seal portion 13 as shown in FIG.

FIG. 8 shows a joint structure using the joint portion according to the second invention of the present invention.

Both joints 14 of both concrete members 2 and 2'here are constructed in the same manner as the one joint according to the first invention described above. Then, the both fastening plates 7 are fastened by the connecting bolts 4, so that the two concrete members 2, 2'are joined.

In this way, there is no need to manufacture another type of concrete member 2, 2'in which the insert metal fitting 8 is embedded,
Since it is only necessary to manufacture the same concrete member, it is possible to provide a structure when the cost is low.

The tightening work up to the connecting bolt 4 is performed by pulling out both screw bolts 4a provided in the bolt insertion portion and screwing washers 4c and nuts 4d into the screw portions at both ends, as in the embodiment shown in FIG. It is done by tightening.

9 and 10 show the connecting bolts 4 of the joint portions 3, 3'according to the first and second inventions of the present invention provided at only one position.

In this way, a plurality of connecting bolts 4 may be provided, such as one to three.

The tightening plates shown in FIGS. 1 and 2 may be fixed to the concrete member by anchor bars (not shown). In this way, the joint can be made stronger.

[Advantages of the Invention] The present invention joins a joining portion formed on a joining end surface of a concrete member, with a through hole for a connecting bolt formed in the concrete member penetrating from the joining operation recess to the joining end surface, and joining. The working recess is provided over substantially the entire length in the depth direction, and is provided with a tightening plate through which the connecting bolt penetrates and is tightened.

Therefore, the concrete member in which the joint end surfaces are brought into contact with each other can be clamped through the clamp plate, and the joint portions of both concrete portions can be prevented from being deformed and can be firmly joined.

In particular, the present invention is flat and chamfered at the exposed corners, the chamfers being flush with the chamfers on the surface-side corners of the joint end face of the concrete member, and the anchor embedded in the concrete A large number of the specified reinforcing plates are provided at the required intervals, the structure is simple, there is no particular difficulty in concrete injection in manufacturing, and the finish is good, and exposed parts are connected to the joint end surface of the reinforcing plate of each concrete member. By bringing them into contact with each other, it is possible to prevent the end portion in the thickness direction of the joint end face, which is easily broken, in the vicinity of the tightening portion of the connecting bolt from being damaged even if firmly joined.

In this way, by joining the concrete members whose joining end surfaces are brought into contact with each other through the fastening plate and by providing the reinforcing plate, a joining structure capable of firmly connecting without fear of damage is provided. Can be provided.

Furthermore, since the structure is simple, there is no need for complicated processing or the like and the amount of material used is small, so that it is possible to provide an inexpensive and economical joint structure as compared with all joint parts.

[Brief description of drawings]

FIG. 1 is a sectional view showing a joint structure according to the first invention of the present invention, FIG. 2 is a sectional view showing a working state of tightening a connecting bolt, and FIG. 3 is a formwork apparatus for manufacturing a concrete member according to the present invention. FIG. 4, FIG. 4 is a perspective view showing a reinforcing plate, FIG. 5 is a cross-sectional view of the formwork device showing a state in which the reinforcing plate is attached, and FIG. 6 is a perspective view showing a concrete member according to the present invention. FIG. 7 is a sectional view showing another embodiment of the reinforcing plate, FIG. 8 is a sectional view showing a joint structure according to the second invention of the present invention, and FIGS. 9 and 10 are joint structures of FIG. 1 and FIG. FIG. 7 is a cross-sectional view showing another aspect of FIG. 1 …… Joining structure, 2,2 ′ …… Concrete member, 2a ……
Joining end face, 2b ... Surface, 3, 3 '... Joining part, 4 ... Connecting bolt, 5 ... Joining work concave part, 6 ... Through hole, 7 ...
Tightening plate, 8 ... Insert metal fitting, 9 ... Reinforcing plate, 9a ... Stud bolt, 10 ... Formwork device, 10a ...
Form plate, 11 ... Mounting screw, 12 ... Medium form, 13 ... Seal part, 14 ... Joining part.

Claims (2)

[Claims] 1. A joint structure in which both joint portions formed at joint ends of a pair of concrete members to be joined are fastened with a connecting bolt to join the both concrete members, and the one joint portion is A through hole for the connecting bolt that is formed in the concrete member by penetrating from the recess for joining work to the joining end surface, and is provided over substantially the entire depth direction of the recess for working, and the connecting bolt penetrates And a tightening plate to be tightened, and the other joint is formed by embedding an insert metal fitting into which a connecting bolt penetrating the through hole is screwed, and at the end portions in the thickness direction of the both joints. Are exposed so that they are flush with the joint end surface and surface of the concrete member. Is the same plane as the chamfer of the corner on the surface side of the joint end face of the concrete member, and the chamfer is applied to the exposed corner of the plane, and a reinforcement plate with anchors embedded in concrete is required. A joint structure for concrete members characterized in that a large number of them are provided at intervals. 2. A joint structure in which both joint portions formed on joint end face portions of a pair of concrete members to be joined are fastened with a connecting bolt to join the both concrete members, and the both joint portions are: A through hole for the connecting bolt formed in the concrete member penetrating from the concave portion for joining work to the joining end surface, and provided over substantially the entire depth of the concave portion for joining work, the connecting bolt passing through And a tightening plate to be tightened, the thickness direction ends of the both joints are exposed so as to be flush with the joint end face and the surface of the concrete member, and each concrete member joint end face is exposed. The exposed parts of the contact part contact each other, and the exposed corners of the exposed part are chamfered.
The chamfer is coplanar with the chamfer of the corners on the surface side of the joint end surface of the concrete member, and there are a plurality of reinforcing plates with anchors protruding from the anchor embedded in the concrete. Characteristic concrete joining structure.