JPH09287151A - Pc foundation connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with a wide range of dimensional discrepancy between PC foundations and also cope with the positional discrepancy between a pair of joint bolts. SOLUTION: This connection structure of PC foundations is provided with a pair of joint bolts 2 protruded to respective opposite end faces of adjacent PC foundations 1, intermediate bolts 3 coaxially arranged between these joint bolts 2, and a pair of nuts 4 connecting both ends of the intermediate bolts 3 and a pair of respective joint bolts 2 by screwing the joint bolts and the intermediate bolts at both sides of the screwed hole. This structure can cope with a wide range of the dimensional discrepancy between the PC foundations 1 by using the intermediate bolts with different lengths. Even if there is a little axial positional discepancy in a pair of joint bolts 2, these bolts can be connected by the nuts 4 by fitting both ends of the intermediate bolts 3 to the ends of a pair of joint bolts 2 and also owing to the play in the screw part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PC base joint structure.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 5 and 6, adjacent PC (precast concrete) foundations 50, 50 are used.
When joining the two, the pair of joint bolts 51, 5 projectingly provided so as to face both end surfaces of the PC foundation 50, 50.
1 are connected by a nut 52. In this case, the nut 52
Is screwed onto the joint bolt 51 of the PC foundation 50 on one side, and the PC foundation 50 on the other side is installed at a predetermined position, and then the nut 5 is mounted so as to straddle the pair of joint bolts 51, 51.
They are linked by advancing two. After connecting, concrete is placed between the PC foundations 50, 50,
The pair of joint bolts 51, 51 and the nut 52 are covered.

On the other hand, two types of nuts 52 having different lengths are prepared in order to correspond to the distance between the pair of joint bolts 51, 51 due to the difference in the dimension L between the PC bases 50, 50. In this case, the projection size of the joint bolt 51 is set to about 65 mm, and the screwing amount of the joint bolt 51 and the nut 52 needs to be 20 mm or more.
When the dimension L between the bases 50, 50 is, for example, 150 mm, a nut 52 having a length of 70 mm is used, and the dimension L is, for example, 1
In the case of 70 mm or 180 mm, a nut 52 having a length of 100 mm is used.

[0004]

However, according to the above-mentioned conventional PC foundation joint structure, when the dimension L between the PC foundations 50 and 50 becomes 200 mm or more, the joint bolt 5 is formed.
1 and the nut 52 could not be connected because the screwing amount was insufficient. Further, if the shafts of the pair of joint bolts 51, 51 are slightly displaced, it was difficult to connect them with one nut 52.

Therefore, an object of the present invention is to provide a PC base joint structure capable of coping with a wide range of dimensional differences between PC bases and coping with the displacement of the shafts of a pair of joint bolts. That is.

[0006]

According to another aspect of the present invention, there is provided a PC foundation joint structure, wherein a pair of joint bolts are provided so as to be opposed to both end faces of adjacent PC foundations, and substantially coaxial between the pair of joint bolts. And a pair of nuts respectively connecting both ends of the intermediate bolt and the pair of joint bolts by screwing the joint bolt and the intermediate bolt on both sides of the screw hole. It is a thing.

As described above, since the pair of joint bolts of the adjacent PC bases are connected using the intermediate bolts and the pair of nuts, by selecting the intermediate bolts having different lengths, the dimensions of the PC bases can be widely varied. Can handle the difference. Further, since there is dimensional tolerance between the screw hole of the nut and the threads of the intermediate bolt and the joint bolt that are screwed into the nut, there is rattling in the screwing portion where the screw hole and the screw thread are screwed together. In this case, since one nut has two screwing portions and two nuts are used, rattling becomes large as a whole. Therefore, even if the shafts of the pair of joint bolts are slightly misaligned, both ends of the intermediate bolt can be aligned with the ends of the pair of joint bolts, and the rattling of the screwed portions can be used to connect them with nuts. it can. Further, along with this, it is possible to deal with the deviation of the pitch.

According to a second aspect of the present invention, there is provided the PC base connecting structure according to the first aspect, wherein the projecting dimension of the joint bolt from the end face of the PC base is 20 mm or more and 40 mm or less. In this way, since the projecting dimension of the joint bolt from the end surface of the PC foundation is 20 mm or more and 40 mm or less, it is possible to cope with the case where the dimension between the PC foundations is small.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A PC basic joining structure according to an embodiment of the present invention will be described with reference to FIGS. A plurality of PC foundations 1 shown in FIG. 1 are manufactured in a factory, and joint bolts 2 are buried so that they can be joined on site. Two joint bolts 2 are vertically projected from the end surface of the PC foundation 1. In addition, adjacent PC foundations 1 and 1 are arranged so that a pair of joint bolts 2 and 2 protruding from both end surfaces face each other. The pair of joint bolts 2 and 2 use an intermediate bolt 3 and a pair of nuts 4 and 4. Are connected.

As shown in FIG. 3, the intermediate bolt 3 is a cut bolt and has a center mark 5 at the center. The diameter of the intermediate bolt 3 and the pitch of the screw are the same as those of the joint bolt 2. In this case, the diameter is 20 mm.
Further, as shown in FIG. 4, when the dimension L between adjacent PC foundations 1 and 1, the protruding dimension T of the joint bolt 2 from the end surface of the PC foundation 1 and the tolerance 10 mm, the length D of the intermediate bolt 3 is , D = L− (T × 2 + 10) mm. In this case, length D, such as 60mm, 110mm
A plurality of intermediate bolts 3 different from each other are prepared.

As shown in FIG. 2, the nut 4 has a screw hole 6 into which the joint bolt 2 and the intermediate bolt 3 are screwed on both sides.
Is provided. Further, the length d of the nut 4 is set so that the screwing amounts of the nut 4, the joint bolt 2 and the intermediate bolt 3 are 20 mm or more. In this case, nuts 4 having a length d of 70 mm and 100 mm are prepared.

Next, a procedure for constructing this PC basic joint structure will be described. After arranging the adjacent PC foundations 1 and 1 so that the pair of joint bolts 2 and 2 face each other, while screwing the nut 4 into one of the joint bolts 2,
The nut 4 is screwed into the intermediate bolt 3 arranged between the pair of joint bolts 2, 2. And the nut 4,
4 is unscrewed, one joint bolt 2 and the intermediate bolt 3 are connected, and the intermediate bolt 3 and the other joint bolt 2
To connect. Alternatively, a pair of nuts 4 and 4 are screwed into the pair of joint bolts 2 and 2, and the nuts 4 and 4 are
May be screwed back to the side of the intermediate bolt 3 and connected in the same manner.
After that, connect the upper and lower intermediate bolts 3, 3 with the reinforcing bar 10,
Concrete is poured between the pair of PC foundations 1 and 1 to cover the intermediate bolt 3 and the nut 4.

On the other hand, during the above construction, a pair of PCs
The lengths of the intermediate bolt 3 and the nut 4 used for the difference in the dimension L between the foundations 1 and 1 are as follows. That is, assuming that the projecting dimension T of the joint bolt 2 is 65 mm, the dimension L between the pair of PC foundations 1, 1 is 200 to 2
If it is 40 mm, the length D of the intermediate bolt 3 is 60 mm,
The length d of the nut 4 is 70 mm, and the dimension L is 260 to 290.
If it is mm, the length D of the intermediate bolt 3 is 60 mm, the length d of the nut 4 is 100 mm, and the dimension L is 310 to 340 m.
If m, the length D of the intermediate bolt 3 is 110 mm and the length d of the nut 4 is 100 mm.

Further, by setting the projecting dimension T of the joint bolt 2 to be 20 mm or more and 40 mm or less, a pair of P
It can also be applied when the dimension L between the C foundations 1 and 1 is 180 mm or less. According to this embodiment, the pair of joint bolts 2 and 2 of the adjacent PC foundations 1 and 1 are connected to the intermediate bolt 3
Since a pair of nuts 4 and 4 are used for connection, by selecting the intermediate bolts 3 having different lengths D, it is possible to cope with the difference in size between the PC foundations 1 and 1 over a wide range. Further, since there is a dimensional tolerance between the threaded hole of the nut 4 and the threads of the intermediate bolt 3 and the joint bolt 1 that are screwed into the nut 4, there is rattling in the threaded portion where the threaded hole and the thread are screwed together. . In this case, one nut 4 has two threaded portions and two nuts 4 and 4 are used, so that rattling becomes large as a whole. Therefore, even when the shafts of the pair of joint bolts 1 and 1 are slightly displaced, both ends of the intermediate bolt 3 are aligned with the ends of the pair of joint bolts 1 and 1, and the rattling of the screwed portion is caused. Can be connected by the nut 4. Further, along with this, it is possible to deal with the deviation of the pitch. Further, by setting the protrusion size T of the joint bolt 2 from the end surface of the PC foundation 1 to 20 mm or more and 40 mm or less,
It is possible to deal with the case where the dimension L between the PC foundations 1 and 1 is small.

If three or more kinds of intermediate bolts 3 having different lengths D are prepared, the difference in the dimension L between the PC foundations 1 and 1 can be dealt with in a wider range. Further, the dimensions such as the length D of the intermediate bolt 3, the length d of the nut 4 and the protrusion dimension T may be other than the above.

[0016]

According to the PC basic joint structure of the present invention,
Since a pair of joint bolts of adjacent PC foundations are connected using an intermediate bolt and a pair of nuts, PCs with a wide range of intermediate bolts can be selected to select a wide range of PCs.
It is possible to cope with the difference in size between the foundations. Further, since there is dimensional tolerance between the screw hole of the nut and the threads of the intermediate bolt and the joint bolt that are screwed into the nut, there is rattling in the screwing portion where the screw hole and the screw thread are screwed together. In this case, since one nut has two screwing portions and two nuts are used, rattling becomes large as a whole. Therefore, even if the shafts of the pair of joint bolts are slightly displaced, it is possible to align both ends of the intermediate bolt with the ends of the pair of joint bolts and to connect them with a nut due to the rattling of the screwed portions. it can. Further, along with this, it is possible to deal with the deviation of the pitch.

According to the second aspect, since the projecting dimension of the joint bolt from the end surface of the PC foundation is 20 mm or more and 40 mm or less, it is possible to deal with the case where the dimension between the PC foundations is small.

[Brief description of drawings]

FIG. 1 is a front view of a PC basic joint structure according to an embodiment of the present invention.

FIG. 2 is a perspective view of a nut according to the embodiment of the present invention.

FIG. 3 is a perspective view of an intermediate bolt according to the embodiment of the present invention.

FIG. 4 is a dimensional explanatory view of the PC basic joint structure according to the embodiment of the present invention.

FIG. 5 is a perspective view of a conventional PC basic joint structure.

FIG. 6 is a front view of a conventional PC basic joint structure.

[Explanation of symbols]

 1 PC Foundation 2 Joint Bolt 3 Intermediate Bolt 4 Nut 6 Screw Hole T Projection Dimension L Dimension Between PC Foundation D Intermediate Bolt Length d Nut Length

Claims (2)

[Claims] 1. A pair of joint bolts protruding so as to face both end surfaces of adjacent PC foundations, an intermediate bolt arranged so as to be substantially coaxial between the pair of joint bolts, and both sides of a screw hole. A PC basic joint structure comprising: the joint bolt and the intermediate bolt; and a pair of nuts respectively connecting the pair of joint bolts with both ends of the intermediate bolt. 2. The PC foundation joint structure according to claim 1, wherein a projecting dimension of the joint bolt from the end surface of the PC foundation is 20 mm or more and 40 mm or less.