JPH0712479Y2 - Connection structure of concrete structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a connection structure for concrete structures such as concrete segments.

"Prior Art" Among conventional concrete structures, as a connection structure of concrete segments used particularly for lining a tunnel, the following structure has been provided.

FIG. 7: is a figure which shows an example of the conventional example of the connection structure in a concrete segment. Reference numeral 1 in the figure indicates a concrete segment. A concave portion 2 for operating a mounting nut is formed on an inner surface of a joint end surface 1a of a concrete segment (hereinafter, simply referred to as a segment) 1 to be joined to each other, and a joint flange 3 located from the concave portion 2 toward the joint end surface 1a is formed. A through hole 4 penetrating therethrough is formed, and a washer fixing recess 5 is formed at one end of the through hole 4 on the recess side.

Inside the recess 2, a mounting bolt storage hole 6 is formed on a surface corresponding to an extension of the through hole 4.

Then, in the connection structure of this segment, a bolt 7 having screws 7a, 7a at both ends is inserted into the hole 4, washers 8, 8 are inserted at both ends thereof, and nuts 9, 9 are screwed in
Screw with a and 7a to connect bolts and nuts.

Next, a method for joining adjacent segments will be described.

First, the bolt 7 is inserted into the bolt housing hole 6 from the hole 4 of one of the two segments to be joined. Lift these segments into a hoist (eg Erector)
While adjusting the position, the hole 4 of the segment where the bolt is inserted and the hole 4 of the segment where the bolt is not inserted are aligned with each other.

After fixing the positions of the holes 4 and 4, the bolt 7 is operated in the recess 2 into which the bolt 7 is inserted so that the male screws 7a and 7a at both ends of the bolt 7 are projected from the recesses 5 and 5. Recess 5,
The washers 8 and 8 are inserted into the male screws 7a and 7a protruding from 5, and the nuts 9 and 9 are screwed together to join the adjacent segments.

"Problems to be solved by the invention" However, in such a connection structure of concrete segments, there are problems to be solved in the following points due to the structure and the demand for larger segments in recent years. It was

That is, in the state where the concrete segments are connected in a tubular shape to construct a tunnel or the like, external pressure such as overload and surrounding earth pressure acts, but against such external pressure, the concrete segment itself is However, it is difficult for the connection between concrete segments to have a structure that balances the strength of the segment body, and a large displacement occurs at the connection of the concrete segments, causing the deflection deformation of the entire shield tunnel. There is a risk that it will not function as a shield tunnel. Moreover, such a problem tends to become more prominent as the size of the concrete segment is increased, and some measure against this has been desired.

Therefore, in order to deal with the above-mentioned problems, the joint flange portion is made thick so that it can withstand the shearing force applied to the connection portion. However, since the joining bolt becomes long accordingly, it is necessary to form a bolt accommodating hole inside the concave portion formed near the joint end face and accommodate the bolt therein, which results in poor work efficiency. There was a flaw.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and communicates with both joint end faces of a concrete structure to be joined to each other and to a bolt fastening recess on the side face of the structure. A connecting structure in which straight insertion holes are formed, and concrete structures are connected to each other by connecting members inserted into these insertion holes, wherein the connecting member can be directly inserted into the insertion hole from the recess. And a connecting shaft having a threaded portion at both ends, which is formed to a length shorter than the entire length of the insertion hole, is fixed in the concave portion of the concrete structure, and is partially inserted in the insertion hole. It is characterized in that it comprises a pair of tightening members that are respectively screwed to the threaded portions at both ends of the connecting shaft.

[Operation] In this invention, after fixing the positions of the concrete structures to be joined to each other, the joining connecting shaft is inserted into the insertion hole, and then the fastening members are fastened to both ends of the joining shaft in the recess. do it. Further, at this time, since both ends of the connecting shaft are not projected into the recess, the fastening operation in the recess is easily performed.

[Example] A connection structure for a concrete structure according to the present invention will be described with reference to the drawings.

1 to 5 are views showing a first embodiment according to the present invention. In these figures, reference numeral 1 indicates a concrete structure.

An operating recess 2 of the connecting member for joining is formed in a portion of the concrete structure 1 located on the inner surface of the joining end face 1a, and a joint flange 3 is formed between the recess 2 and the joining end face 1a. ing. The joint flange 3 is formed with a through hole 4 for a connecting member that penetrates through the joint flange 3, and a washer fixing recess 5 is formed at one end of the through hole 4 on the recess side.

The joining connecting member 10 is formed by forming a steel material into a columnar shape and screwing the outer circumferences of both ends thereof.
It is formed to have a length that allows direct insertion into.

The tightening member 11 is composed of a threaded portion 11a obtained by threading the inner surface of a cylindrical steel material, and a tightening portion 11b provided at one end of the threaded portion 11a. The threaded portion 11a extends from the recess 2 to the insertion hole 4. It is formed as a whole in such a length as to allow insertion of.

Note that the threading performed on the tightening member 11 penetrates the tightening member 11 in the axial direction depending on the situation.

Next, a method for joining concrete structures having such a configuration will be described.

First, the concrete structures 1 and 1 to be joined have holes 4 and 4,
Match and fix. Two concrete structures 1, 1
The connecting member 10 is inserted from one recess 2 into the holes 4 and 4 connecting the recesses 2 and 2.

With the connecting member 10 inserted into the holes 4 and 4, the tightening members 11 and 11 are inserted into the holes 4 and 4 from the recesses 2 and 2 through the washers 12 and 12.
4 and is fastened to the connecting member 10. Reference numeral 13 in the figure is
Another embodiment of the tightening member is shown, and the threading performed on the connecting member 10 and the connecting member 13 is penetrated in the respective axial directions as necessary.

According to the connection structure as described above, even if the joint flange 3 is made large in order to increase the connection strength, it is not necessary to make the connecting member longer than in the conventional case, so that the work efficiency at the time of joining is good.

FIG. 6 is a view showing a second embodiment according to the present invention. According to this embodiment, the members to be inserted into the holes 4 and 4 are the connecting members 14 that are threaded inside both ends of the cylindrical steel material and have a length that can be inserted into the holes 4 from the recesses 2, After inserting the connecting member 14 into the holes 4 and 4, from both ends of the washer 1
Tightening members 15, 15 are fastened via 2, 128.

The tightening member 15 includes a screw portion 15a screwed to be screwed into the connecting member 14, and a tightening portion 15b formed at one end of the screw portion 15a.

Also in this embodiment, the same effect as that of the above embodiment can be obtained.

"Effects of the Invention" Since the present invention is configured as described above, it has the following effects.

That is, in the connection structure of the concrete structure according to the present invention, even if the joint flange is enlarged to increase the connection strength, the joint can be joined without lengthening the connecting member for joining, so that the work efficiency at the time of joining is improved. Is good. For this reason,
When the connection structure according to the present invention is used for a concrete segment, no matter how large the concrete segment is made and the joint flange portion is enlarged so as to withstand the external pressure applied thereto, the connecting member for joining is short and Good work is possible.

Further, since both ends of the connecting shaft are not projected into the recess, when fastening the fastening member to both ends of the connecting shaft,
The fastening work with the fastening member can be easily performed.

[Brief description of drawings]

1 to 5 are views showing a first embodiment according to the present invention, FIG. 1 shows a connection structure of a concrete structure, FIG. 2 is a side sectional view of a fastening member, and FIG. Is the second
FIG. 4 is a front view of the drawing, FIG. 4 is a side sectional view of another embodiment of the fastening member, and FIG. 5 is a front view of FIG. FIG. 6 shows a second embodiment of the present invention and is a view showing a connection structure for concrete structures. FIG. 7 is a diagram showing an example of a conventional connection structure for a concrete structure. 1 ... Concrete structure, 2,5 ... Concave, 3 ... Joint flange, 4 ... Hole, 8,12 ... Washer, 9 ... Nut, 10,14 ... Connecting member, 11,13,15 ...... Tightening member.

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Claims (1)

[Scope of utility model registration request] 1. A concrete structure is formed on both joint end surfaces of concrete structures to be connected to each other by forming linear insertion holes communicating with the bolt fastening recesses on the side surfaces of the structures and connecting members inserted into these insertion holes. A connection structure for connecting objects, wherein the connecting member is directly insertable from the recess into the insertion hole and is formed to have a length shorter than a total length of the insertion hole,
A pair of connecting shafts having threaded portions on both ends, and a set fixed in the recesses of the concrete structure and partially inserted into the insertion holes and screwed to the threaded portions on both ends of the connecting shaft, respectively. A connecting structure for a concrete structure, characterized in that it is composed of a tightening member.