JP2003064777A - Coupling fittings for concrete block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the range of positional deviation absorbing allowance of the shaft center of each steel rod for anchorage and to simplify the construction of the conventional fittings thereby improving the efficiency of the production work. SOLUTION: The coupling fittings 20 is equipped with a first linking member 27 having a linking portion 34 provided by screwing a base end portion 32 to the first tip screw portion 25a through a neck portion 33 at the tip side, a second linking member 28 screwed to the tip screw portion 26a, and a cylindrical coupling member 29 coupling the first and second linking members through the upper and lower end walls 31 and 32. These coupling members are mutually coupled together by both half-split vertical portions 29a and 29b, and are formed with the first and second insertion holes 35 and 36 which are loosely inserted with predetermined gaps C1 and C2 in the respective radius direction by the neck portion of the first linking member and the second tip screw portions between half-split facing surfaces of the upper and lower end walls.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting fitting for integrally connecting, for example, concrete blocks manufactured by dividing in advance.

[0002]

2. Description of the Related Art In recent years, for the purpose of improving quality and shortening construction time on site, for example, a large-scale concrete product is manufactured in advance by dividing it into a plurality of concrete blocks in a factory, and each concrete block is constructed. In the field, it is performed to integrally connect using, for example, a connecting fitting.

As a conventional technique of this connecting fitting, for example, one disclosed in Japanese Patent Laid-Open No. 2000-179053 is known.

As shown in FIG. 5 and FIG. 6, the connecting fitting 1 is made up of concrete blocks 2a and 2b which are opposed to each other.
Of the upper and lower tip screw portions 3a and 4a of the fixing steel bars 3 and 4 which are buried inside in the vicinity of the connecting surface of the
A second fastening member 5, which is provided between the first fastening member 5 and the lower first tip screw portion 3a, and a second fastening member 5 which is inserted between the upper second tip screw portion 4a and screwed into the first fastening member 5. The fastening member 6 is provided.

The first fastening member 5 has a substantially cylindrical shape, has a female screw hole 7 formed in the lower end portion for screwing into the first tip screw portion 3a, and has an outer peripheral surface formed with the first tip screw member 3a. A male screw portion 8 having a pitch larger than the pitch of the portion 3a is formed. The axis of the male screw portion 8 is eccentric to the axis of the female screw hole 7.

The second fastening member 6 has a substantially cylindrical shape, and an insertion hole 9 having a diameter larger than the outer diameter of the second tip screw portion 4a is formed substantially in the center of the upper end of the second fastening member 6. A female screw portion 10 with which the male screw portion 8 of the first fastening member 5 is screwed is formed.

A locking nut 11 capable of locking the second fastening member 6 is screwed onto the second tip screw portion 4a.

Further, holding nuts 12 and 13 for holding the fastening members 5 and 6 are screwed to the first tip screw portion 3a and the second tip screw portion 4a, respectively.

Then, in order to connect the upper and lower concrete blocks 2a and 2b with the connecting fitting 1, as shown in FIG.
As shown in FIG. 1, first, the first fastening member 5 is screwed into the first tip screw portion 3a to be rotatably attached to a predetermined position, and the second fastening member 6 is inserted into the insertion hole 9 in the second tip screw portion 4a. Insert through.

After that, the locking nut 11 is screwed to the second tip screw portion 4a, and the second fastening member 6 is attached so as to be freely movable in the axial direction and the axial vertical direction of the second tip screw portion 4a. By this, the mutual concrete blocks 2a,
2b facing each other of the fixing steel bars 3 and 4, the respective threaded end portions 3a,
The female and male screw portions 8 and 10 of the first and second fastening members 5 and 6 can be easily screwed together regardless of the error of the axis of 4a and the phase difference. Then, as shown in FIG. 6, by fastening the first and second fastening members 5 and 6, the upper and lower concrete blocks 2a and 2b can be integrally coupled while applying a pressing force to the opposing coupling surfaces. it can.

Further, by the respective holding nuts 12 and 13,
When an external force is applied to the integrally connected concrete blocks 2a, 2b, it is possible to suppress the plastic deformation of the fixing steel bars 3, 4 and the fastening members 5, 6 from occurring.

[0012]

However, in the conventional connecting fitting 1, as described above, the fixing steel bars 3, 3 are inserted through the large-diameter insertion hole 9 formed in the second fastening member 6. 4, the first and second fastening members 5, irrespective of the axial error (radial error) and phase difference of the tip screw portions 3a, 4a of FIG.
Although the male and female screw portions 8 and 10 of 6 can be easily screwed together, one insertion hole 9 is provided to absorb the error in the axial direction.
There is a limit to the absorption allowable range because it is done by. That is, since the diameter of the insertion hole 9 is determined by the relationship between the outer diameter of the second fastening member 6 and the rigidity, the size of the insertion hole 9 naturally has a limit. Therefore, the range in which the error in the both axial directions can be absorbed is naturally limited.

Further, since the second fastening member 6 is screwed into the first fastening member 5, not only the male screw portion 8 and the female screw portion 10 have to be formed respectively,
Both axial lines of the female screw portion 7 and the male screw portion 8 of the first fastening member 5 must be formed eccentrically. For this reason, the structure is complicated and the manufacturing work efficiency is reduced.

Further, both fastening members 5 and 6 and locking nut 1
In addition to 1, the holding nuts 12, 13 and the like are required, so a large number of parts are required, and this also leads to a reduction in manufacturing work efficiency.

[0015]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned conventional technical problems. The invention according to claim 1 is directed to connecting surfaces of concrete blocks which are divided and formed and which face each other. An opening is formed in each of the concrete blocks, and the tips of the fixing steel bars embedded in each of the concrete blocks are exposed to face each other inside the openings, and the tips of the fixing steel bars are respectively locked to the concrete blocks. And a first locking member having a locking portion provided on the distal end side via a neck portion, and a distal end portion of the other coupling metal fitting for coupling And a tubular connecting member that connects the first and second engaging members via the end walls at both ends, and the connecting member is divided into vertical divisions. The two halves thus formed are connected to each other by fastening means. Between half facing surfaces of the walls, is characterized in that an insertion hole in which the said other tip and the neck portion of the first locking member is inserted with a predetermined gap in the radial direction are formed, respectively.

The invention according to claim 2 is characterized in that the centers of the respective insertion holes formed in the both end walls are formed coaxially.

The invention according to claim 3 is characterized in that an engaging portion with which a predetermined rotating jig is engaged is provided on the outer peripheral surface of the base end portion of the first engaging member.

According to a fourth aspect of the present invention, the fastening means is formed by forming a female screw hole formed in the radial direction of one of the half-divided portions and a hole of the other half-divided portion in the radial direction. It is characterized in that it is configured by a fastening bolt which is inserted into the bolt insertion hole and whose tip portion is screwed into the female screw hole.

The invention according to claim 5 is characterized in that the second locking member is constituted by a nut screwed to the other end portion.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a concrete block connecting fitting according to the present invention will be described below in detail with reference to the drawings.

That is, as shown in FIGS. 1 and 2, a large-sized concrete block product is previously divided into upper and lower two concrete blocks 21 and 22 and is formed substantially on the opposing connecting surfaces of both concrete blocks 21 and 22. The trapezoidal openings 23 and 24 are formed, and the first and second tip screw portions 25a and 26a, which are the tip portions of the fixing steel bars 25 and 26 embedded in the interior in the vertical direction, are formed. It is exposed from the openings 23, 24 so as to face each other in the axial direction.
In the case of 26a, when the upper and lower concrete blocks 21 and 22 are overlapped with each other, a predetermined gap is formed between the respective tip edges, and the connecting metal fitting 20 has the two tip screw portions 25a, 25a.
6a is connected.

The connecting fitting 20 has a first locking member 27 screwed to the lower first tip screw portion 25a and a second locking member 28 screwed to the upper second tip screw portion 26a.
And the first and second locking members 27 and 28 on the upper and lower end walls 3
It is mainly composed of a cylindrical connecting member 29 which is connected via 0 and 31.

As shown in FIGS. 1 and 2, the first locking member 27 has a base end portion 32 having a female screw portion 32a which is screwed to the first tip screw portion 25a in the inner axial direction, and the base portion 32a. The upper end of the end portion 32 and a locking portion 34 that are integrally provided via a neck portion 33. The base end portion 32 is formed into a substantially cylindrical shape having a predetermined length, and an outer peripheral surface thereof is formed with a hexagonal surface 32b which is an engaging portion with which a spanner, which is a jig for rotation (not shown), can be engaged. Has been done. Also, the neck 33
Is formed in a substantially columnar shape and has an outer diameter smaller than the outer diameter of the locking portion 34, while the locking portion 34 is
Is formed in a large-diameter cylindrical shape.

The second locking member 28 is formed by a nut having an inner peripheral surface formed with a female screw 28a to be screwed into the second tip screw portion 26a, and an outer peripheral surface thereof is engaged with a spanner which is a jig for rotation. A hexagonal surface 28b that can be fitted is formed.

As shown in FIGS. 1 and 2, the connecting member 29 is formed in a substantially cylindrical shape having a predetermined length having the both end walls 30 and 31 at the upper and lower ends, and the both end walls 30 and 31 are included. The whole is divided into two parts in the vertical direction from the diametrical direction to the left and right, and both half-divided parts 29a and 29b are coupled to each other by fastening means.

Further, the both end walls 30 and 31 are provided with the first locking member 2 at substantially central positions of the facing surfaces of the respective divided semicircular portions 30a, 30b, 31a and 31b.
The first insertion hole 35 through which the neck portion 33 of 7 and the second insertion hole 36 through which the second tip screw portion 26a are inserted are respectively formed so as to penetrate therethrough. Therefore, the respective semicircular portions 30a, 30 are formed.
Semicircular arc grooves 35a, 35b, 36a, 36b for forming the first and second insertion holes 35, 36 are formed in b.

The diameter length of each of the insertion holes 35 and 36 is set to be relatively larger than the diameter length of the neck portion 33 or the second tip screw portion 26a, so that the neck portion 33 or the second tip screw portion 26a respectively. Are inserted in a loosely fitted state through predetermined gaps C1 and C2. The centers of both insertion holes 35 and 36 are formed coaxially.

The fastening means includes a fastening bolt 38 which is inserted through a bolt hole 37 formed in a radial direction at a substantially central position of one half-split portion 29a, and a radial direction at a substantially central position of the other half-split portion 29b. And a female screw hole 39 into which a male screw portion on the front end side of the fastening bolt 38 is screwed.

Further, at a position below the bolt hole 37 of the one half portion 29a, a cement type non-shrinking grout agent G is injected into the connecting member 29 after the final assembling work is completed. A hole 40 is provided.

The procedure for connecting both concrete blocks 21, 22 according to this embodiment will be described below. First, the upper concrete block 2 is attached to the lower concrete block 21.
If you place 2 while positioning it forward and backward, both openings 2
The respective tip screw portions 25a, 26a facing the insides of 3, 24 are arranged so as to face each other substantially in the axial direction, although their axes are deviated from each other.

Then, as shown in FIGS. 1 and 3, the second
The locking member 28 is screwed onto the second tip screw portion 26a and held at a predetermined position. Subsequently, both half-divided portions 29 of the connecting member 29
At this time, the second locking member 28 is attached to the space 41 between the end walls 30a and 31a.
Inside, the upper half-circular arc grooves 36a, 36b
The second tip screw portion 26 at the upper position is abutted so as to be sandwiched therebetween, and at the same time, the locking portion 34 is also fixed to the space portion 41.
When placed inside, both lower semi-circular arc grooves 35a, 35b
The neck portion 33 of the first locking member 27 is butted so as to sandwich it.

Next, as shown in FIG. 3, the fastening bolt 38
Is inserted into the bolt hole 37 and screwed into the female screw hole 39, the first locking member 27 is held movably up and down via the neck portion 33 and the first insertion hole 35 of the connecting member 29. At the same time, the connecting member 29 itself is also the second tip screw portion 26.
It will be held vertically movable in a.

Thereafter, as shown in FIG. 4, the base end portion 32 of the first locking member 27 is screwed onto the first tip screw portion 25a, and the base end portion 32 is rotated in the tightening direction by a spanner as it is. If screwed in and tightened, the second locking member 2
The inner end surface of the upper end wall 31 is pressed against the upper surface of 8, and the inner end surface of the lower end wall 30 is pressed against the lower surface of the locking portion 34, so that the whole is pulled vertically with a predetermined torque. Therefore, the two concrete blocks 21 and 22 are strongly connected to each other while the opposite connection surfaces 21a and 22a are attracted to each other via the fixing steel bars 25 and 26 and are pressed against each other.

Finally, the grout agent G is introduced from the injection hole 40.
By injecting, it is possible to fix each component inside the connecting member 29 and obtain a rust preventive effect.

As described above, in this embodiment, 2
By simply assembling the divided half portions 29a and 29b of the connecting member 29, both locking members 27 and 28 can be connected to connect both fixing steel bars 25 and 26. It will be easier.

Moreover, when the axes X and Y of the two fixing steel bars 25 and 26 are deviated from each other, the deviation of the axes can be absorbed by the insertion holes 35 and 36 having a relatively large diameter. That is, the deviation of the axes X and Y of the two is simply
Not only the clearance C1 of the insertion hole 35 but also the second insertion hole 36
Since they can be mutually absorbed by the gap C2 of the concrete blocks 21 and 22, the tolerance for the manufacturing error of the concrete blocks 21 and 22 and the centering error of the fixing steel bars 25 and 26 is expanded, and the concrete blocks 21 and 22 of A reliable connection is obtained. As a result, the connection work efficiency is further improved.

In particular, the center P of each of the insertion holes 35, 36
Since 1 and P2 are formed on the same axis, the allowable absorption range for the deviation of the axes X and Y becomes large.

Further, the whole structure can be simplified as compared with the conventional one, and the number of parts can be reduced without requiring a large number of nuts as in the conventional one, so that the manufacturing work efficiency can be further improved. Become.

Further, by changing the screwing movement position of the second locking member 28 according to the length between the tip screw portions 25a and 26a, the connecting member 29 and the first locking member 27 are axially moved. The position of can be changed freely.

The present invention is not limited to the configuration of the above embodiment, and for example, the second locking member 28 can be integrally provided at the tip of the fixing steel bar 26 from the beginning of manufacture, and It is also possible to freely change the sizes of the insertion holes 35 and 36 according to the sizes of the locking member 28 and the locking portion 34 and the like. Further, the centers P1 and P2 of the insertion holes 35 and 36 can be formed so as to be eccentric in the radial direction.

[0041]

As is apparent from the above description, claim 1
According to the invention described in (1), the positional deviation of the shaft centers of the fixing steel bars facing each other can be absorbed by the first and second insertion holes formed in the connecting member, so that the absorption allowable range is large. Therefore, the connection work of each concrete block becomes easy.

Moreover, since the entire structure of the connecting fitting is simplified and the number of parts can be reduced, the manufacturing work and the assembling work efficiency are improved.

According to the second aspect of the present invention, since the centers of the respective insertion holes are formed coaxially, it is possible to further increase the allowable absorption range of the positional deviation of the axial center of each fixing steel bar.

According to the invention of claim 3, claim 1
In addition to the effect of (3), the engaging portion facilitates the rotation work of the first locking member.

According to the invention described in claim 4, since the fastening means is simply formed by the fastening bolt and the female screw hole of the one half, the manufacturing work and the fastening are different from the case where other nuts are used. Easy to work.

According to the fifth aspect of the invention, since the second locking member is simply formed by the nut, the manufacturing work thereof is facilitated and the mounting work thereof is facilitated.

[Brief description of drawings]

FIG. 1 is an exploded vertical sectional view of an embodiment of a connecting fitting according to the present invention.

FIG. 2 is an exploded perspective view of the connecting fitting.

FIG. 3 is a vertical cross-sectional view showing a procedure for assembling the connecting fitting.

FIG. 4 is a vertical cross-sectional view showing a state in which the connecting fitting is assembled.

FIG. 5 is a vertical cross-sectional view showing a procedure for assembling a conventional connecting fitting.

FIG. 6 is a vertical sectional view of a conventional connecting fitting.

[Explanation of symbols]

20 ... Connecting bracket 21 ・ 22 ... Concrete block 23.24 ... Opening 25 ・ 26 ... Fixing steel bar 25, 26a ... Tip screw portion (tip portion) 27 ... First locking member 28 ... Second locking member 29 ... Connecting member 29a, 29b ... Half-split part 30 ・ 31 ... End wall 35/36 ... First and second insertion holes 37 ... Bolt hole 38 ... Fastening bolt 39 ... Female screw hole

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2E125 AA72 AF01 AG10 AG13 AG25                       AG41 BA12 BA22 BB08 BB16                       BB18 BB22 BB24 BB25 BB27                       BB30 BC09 BD01 BE08 BF04                       BF08 CA05 CA82 EA02 EA33                 4G058 GA01 GB02 GE01 GE07 GE15

Claims (5)

[Claims] 1. An opening is formed in a connection surface of each of the divided concrete blocks which faces each other, and the tip of a fixing steel bar embedded in each of the concrete blocks is opposed to the inside of the opening. A connecting fitting which is exposed and is respectively locked to both of the front end portions to connect the respective concrete blocks, wherein a base end portion is screwed to the one front end portion and is provided on the front end side through a neck portion. A first locking member having a locking portion, a second locking member attached to the other end portion, the first locking member,
And a tubular connecting member for connecting the second locking member via the end walls at both ends, the connecting member being formed by connecting both half-divided parts vertically divided into one another by fastening means. In the concrete block, the neck portion of the first locking member and the other end portion of the both end walls are formed with insertion holes through which a predetermined gap is inserted in the radial direction, respectively. Connecting fitting. 2. The center of each insertion hole formed in each of the both end walls is formed coaxially.
Concrete block connection fittings described in. 3. The concrete block according to claim 1 or 2, wherein an engaging portion with which a predetermined rotating jig is engaged is provided on an outer peripheral surface of a base end portion of the first locking member. Connecting fitting. 4. The fastening means is inserted through a female screw hole formed in one half of the half-divided portion in the radial direction and a bolt insertion hole formed in the other half-divided portion of the half-divided portion in the radial direction so that the tip portion is The connection fitting for a concrete block according to any one of claims 1 to 3, comprising a fastening bolt screwed into the female screw hole. 5. The concrete block connecting fitting according to any one of claims 1 to 4, wherein the second locking member is constituted by a nut screwed to the other end of the second locking member.