JP2021162077A - Fastening member for temporary fixing - Google Patents

Abstract

To provide a fastening member for temporary fixing capable of efficiently performing temporary fixing.SOLUTION: A temporary bolt 10 comprises: a cylindrical body part 11 having a tapered tip part 11t; a nut 13 provided at a thread part 11s of a base end part 11b in the body part 11; and a protrusion member 15 arranged in a hole 12 formed at a position separated from the nut 13. The protrusion member 15 is pressed to insert the temporary bolt 10 housed in the hole 12 into the hole of an aligned steel beam and the hole of a splice plate. Then, when the hole 12 of the temporary bolt 10 comes out of the steel beam and the splice plate, the protrusion member 15 projects radially outward, and engages with the splice plate.SELECTED DRAWING: Figure 1

Description

The present invention relates to a temporary fixing fastening member used for temporary fixing when building a steel frame or the like.

For example, when connecting steel beams, the ends of the two steel beams to be connected are sandwiched between splice plates and fixed with high-strength bolts. In this case, before fixing the high-strength bolt, a temporary bolt is used to temporarily join the joint portion of the steel frame beam (see, for example, Patent Documents 1 and 2). The temporary bolt described in Patent Document 1 is a temporary bolt that can be easily fastened, and is a threaded portion provided at the tip of the shaft portion and an alignment portion provided at a portion farther from the tip of the shaft portion than the threaded portion. And have. The threaded portion fits into the nut after passing through each through hole of the plurality of objects to be fastened. Further, in the temporary bolt described in Patent Document 2, the thread angle of the bolt is obtuse, so that the interval between the threads is widened, the rotation rate of the screw is increased, the number of times of tightening is reduced, and the work efficiency is improved. increase.

Japanese Unexamined Patent Publication No. 2019-060440 Japanese Unexamined Patent Publication No. 2015-055312

Normally, a medium bolt is used as a temporary bolt, so even if it is temporarily fixed, it is necessary to perform normal bolt tightening work. In this case, the middle bolt is inserted into the hole of the member to be fastened, and the nut is screwed into the tip of the bolt passed on the side opposite to the inserted side. Further, even when the temporary bolts described in Patent Documents 1 and 2 are used, after the shaft portion is inserted into the member to be fastened, the nut is fitted to the screw portion on the side opposite to the inserted side. Therefore, in the temporary fixing, it is necessary to perform the work on both sides of the member to be fastened, which takes time and effort.

Temporary fixing fastening members for solving the above problems include a cylindrical main body portion, a locking portion provided on the main body portion, and a hole formed in the main body portion at a position separated from the locking portion. The elastic body arranged in the main body includes a protruding member protruding from the inside of the main body in the outer diameter direction.

According to the present invention, temporary fixing can be performed efficiently.

A partial cross-sectional front view of the temporary fixing bolt in the embodiment. The side view of the main part of the temporary fixing bolt in an embodiment. The side view of the protrusion member of the temporary fixing bolt in an embodiment. FIG. 3 is a perspective view of a joint portion of a steel beam to which a temporary fixing bolt is attached in the embodiment. Explanatory drawing before inserting a temporary fixing bolt in an embodiment. Explanatory drawing in the middle of inserting a temporary fixing bolt in an embodiment. Explanatory drawing after penetrating a temporary fixing bolt in an embodiment. A partial cross-sectional front view of a temporary fixing bolt in the first modification example. FIG. 3 is a cross-sectional view of a main part of a temporary fixing bolt in the first modification. A partial cross-sectional front view of a temporary fixing bolt in the second modification example. A partial cross-sectional front view of a temporary fixing bolt in the third modification example. A partial cross-sectional front view of a temporary fixing bolt in the fourth modification example.

Hereinafter, an embodiment in which the temporary fixing fastening member is embodied will be described with reference to FIGS. 1 to 7. The temporary fixing fastening member of the present embodiment will be described as a temporary bolt used for positioning the splice plate and the steel beam when the steel beams are fixed to each other by using the splice plate and the high-strength bolt.

As shown in FIG. 1, the temporary bolt 10 includes a main body portion 11 having a substantially cylindrical shape having a total length of about 130 mm and a diameter of about 20 mm. The main body portion 11 includes a tip portion 11t having a tapered shape, a hole 12, and a threaded portion 11s. The hole 12 is formed in the main body portion 11 in a cylindrical portion on the base end portion 11b side opposite to the tip portion 11t from the tip portion 11t. The hole 12 extends in the outer diameter direction of the main body portion 11, but does not penetrate in the main body portion 11. The thread portion 11s is provided in the main body portion 11 from the center to the base end portion 11b. A male screw is formed on the outer circumference of the thread portion 11s, and a nut 13 as a locking portion is screwed. The nut 13 is provided so as to be movable in the axial direction of the main body portion 11 within the screwing range of the thread portion 11s.

A through hole 11h is formed on the base end portion 11b side of the thread portion 11s. A cylindrical member 14 made of metal or the like is fitted into the through hole 11h. The cylindrical member 14 projects in the outer diameter direction from the through hole 11h of the main body portion 11 and functions as a retaining member on the base end portion 11b side of the nut 13. Further, a string or the like may be passed through the cylindrical member 14. Since this string can be hooked on an operator or a member to hold the temporary bolt 10 before use, it is possible to suppress the temporary bolt 10 from falling before use.

One protrusion member 15 is arranged in the hole 12 of the main body 11. The protruding member 15 has a substantially cylindrical shape having a diameter of about 10 mm. The outermost end of the protruding member 15 has an inclined surface notched diagonally from both sides with different inclinations. The protruding member 15 is arranged in the hole 12 so that the inclined surface projects outward from the opening of the hole 12 and the protruding length thereof is longer on the base end portion 11b side of the main body portion 11 and shorter on the tip end portion 11t side. NS. The longest axial length of the protrusion member 15 is shorter than the length of the hole 12. Therefore, when the protrusion member 15 is pushed in from the outside diameter direction, the entire protrusion member 15 can enter the inside of the outer shape of the main body portion 11.

In the present embodiment, the tip end side portion 15t of the protrusion member 15 has an inclined surface of about 4 mm with respect to the diameter of the protrusion member 15, and the tip end portion 11t side of the main body portion 11 is lower than the base end portion 11b side. Further, the base end side portion 15b of the protrusion member 15 has a size of about 1.5 mm to 2.0 mm from the outer diameter direction and is inclined by about 45 degrees to the side opposite to the inclined surface of the tip end side portion 15t. Has a face.

A recess 15h is formed at the rear end of the protrusion member 15 on the axial direction. A spring 16 as an elastic body is fixed between the side wall of the hole 12 and the recess 15h of the protrusion member 15.
Further, as shown in FIG. 3, a rectangular groove 15g having rounded corners is formed on one side surface of the protrusion member 15. The groove 15g is provided so as to extend in the axial direction of the protrusion member 15.
As shown in FIG. 2, the stopper pin 17 is driven and fixed from the outside of the main body 11 of the temporary bolt 10 into the groove 15 g of the protrusion member 15. The stopper pin 17 is embedded in the main body 11.

As shown in FIG. 3, the protrusion member 15 moves while the groove 15g is guided by the stopper pin 17 to prevent the protrusion member 15 from falling out of the hole 12. In the present embodiment, the protrusion member 15 is pressed in the out-of-diameter direction by the spring 16. In this case, when the stopper pin 17 is locked to the side wall of the groove 15g, the base end side portion 15b of the protrusion member 15 protrudes from the outer shape of the main body portion 11 by about 4 mm, and the end surface of the tip end side portion 15t on the tip end portion 11t side. The protrusion member 15 stops at a position inside the outer shape of the main body 11.

(Temporary fixing method)
Next, a method of temporarily fixing the steel beam using the above-mentioned temporary bolt 10 will be described with reference to FIGS. 4 to 7.

Here, as shown in FIG. 4, a case where two steel beam 20s are fixed will be described. The steel beam 20 has an upper flange 21, a lower flange 22, and a web 23. Then, the upper flange 21, the lower flange 22 and the web 23 of the two steel beams 20 are aligned, and both sides of the upper flange 21, the lower flange 22 and the web 23 are sandwiched by the splice plate 31. A plurality of fixing holes 31h are formed in the splice plate 31. Each fixing hole 31h is provided at a position consistent with the fixing holes formed in the flanges (21, 22) and the web 23.

In the present embodiment, the upper flange 21 and the lower flange 22 of one of the two steel beam 20s (on the right side in FIG. 4) to be connected are temporarily fixed by using the middle bolt B1 as in the conventional case.
Then, the web of the two steel beam 20s and the other (left side in FIG. 4) steel beam 20 upper flange 21 and lower flange 22 are temporarily fixed by using the above-mentioned temporary bolt 10. In this case, as in the conventional case, in the web 23 and the flanges (21, 22), temporary bolts 10 are inserted into holes that are 1/3 or more of the number of holes to be fixed and temporarily fixed.

Here, since the temporary fixing method using the temporary bolt 10 on the flanges (21, 22) of the web 23 and the other steel beam 20 is the same, the web 23 will be described.
In this case, as shown in FIG. 5, the fixing hole 23h of the web 23 into which the temporary bolt 10 is inserted and the fixing hole 31h of the splice plate 31 sandwiching the web 23 are aligned.

Next, the nut 13 screwed into the threaded portion 11s of the temporary bolt 10 is rotated to obtain a length L2 from the end surface of the hole 12 on the base end portion 11b side to the end surface of the nut 13 on the tip end portion 11t side. The length of the 23 and the two splice plates 31 is adjusted to correspond to the thickness L1.

Then, the protrusion member 15 of the temporary bolt 10 is pressed toward the center so that the protrusion member 15 does not come out of the hole 12. Next, the temporary bolt 10 is inserted into the matching hole 23h of the web 23 and the fixing hole 31h of the splice plate 31 from one side of the splice plate 31 (right side in FIG. 5).

In this case, since the tip portion 11t of the temporary bolt 10 has a tapered shape, the temporary bolt 10 is smoothly inserted into the fixing holes 23h and 31h.
Then, as shown in FIG. 6, in the fixing holes 23h and 31h, the protrusion member 15 of the temporary bolt 10 passes in the hole 12 in a state of being pushed into the hole 12 by the hole wall of the fixing holes 23h and 31h.

After that, as shown in FIG. 7, when the hole 12 of the temporary bolt 10 penetrates the fixing hole 31h, the protrusion member 15 is pushed out in the out-of-diameter direction R1 by the force of the spring 16 and protrudes. As a result, the base end side portion 15b of the protrusion member 15 comes into contact with the side surface of the splice plate 31 and does not go back into the fixing hole 31h. As a result, the temporary bolt 10 penetrates the web 23 and the splice plate 31 and cannot be pulled out. Therefore, the web 23 and the two splice plates 31 are temporarily fixed in a state where the fixing holes 23h and 31h are aligned.
After that, when removing the temporary bolt 10 for fixing with the high-strength bolt, the protrusion member 15 is pressed toward the center side (inside the hole 12) and pulled out in the direction opposite to the insertion direction.

(Action)
When the temporary bolt 10 is inserted into the fixing holes 23h and 31h, the protrusion member 15 passes through the fixing holes 23h and 31h while being pushed in the radial direction. Then, when the hole 12 comes out of the fixing holes 23h and 31h, the protruding member 15 protrudes and comes into contact with the splice plate 31 to lock it. When releasing the temporary fixing, the temporary bolt 10 is pulled out from the fixing holes 23h and 31h by pushing the protrusion member 15 into the hole 12.

According to this embodiment, the following effects can be obtained.
(1) In the present embodiment, the temporary bolt 10 includes a protrusion member 15 that does not protrude from the hole 12 when pressed. When the pressing force is released, the protruding member 15 protrudes from the hole 12 in the out-diameter direction by the built-in spring 16. Therefore, when the protrusion member 15 of the temporary bolt 10 inserted into the fixing holes 23h and 31h penetrates the fixing holes 23h and 31h, the protrusion member 15 protrudes by the spring 16 and is locked to the splice plate 31. As a result, the steel beam 20 and the splice plate 31 can be temporarily fixed by simply inserting the temporary bolts 10 into the fixing holes 23h and 31h, so that the steel beams 20 can be temporarily fixed to each other in a short time. It is also possible to quickly release the crane that was hanging the bolt.

(2) In the present embodiment, since the tip portion 11t of the temporary bolt 10 has a tapered shape, the temporary bolt 10 can be smoothly inserted into the fixing holes 23h and 31h.
(3) In the present embodiment, the protrusion member 15 of the temporary bolt 10 has an inclined surface having an oblique shape in which the tip end portion 11t side is short and the base end portion 11b side is long in the tip end portion side portion 15t. As a result, while reducing the weight of the temporary bolt 10, the protrusion member 15 can be locked to the splice plate 31 to prevent the temporary bolt 10 from returning to the fixing hole 31h. Further, by inclining the base end portion 11b side in the base end portion side portion 15b, it is possible to suppress the catching in the splice plate 31.

(4) In the present embodiment, the position of the end surface of the tip end side portion 15t of the protrusion member 15 on the tip end portion 11t side in a non-pressed state is located inside the outer shape of the main body portion 11. As a result, when the temporary bolt 10 is inserted, the protrusion member 15 is pressed inward and contracted, so that the temporary bolt 10 can be smoothly inserted into the fixing holes 23h and 31h.

(5) In the temporary bolt 10 of the present embodiment, a nut 13 screwed into the thread portion 11s of the main body portion 11 is provided so as to be movable in the axial direction of the main body portion 11. Thereby, the length L2 from the hole 12 (protrusion member 15) of the temporary bolt 10 to the nut 13 can be changed according to the thickness L1 of the web 23 of the steel frame beam 20 and the splice plate 31 through which the temporary bolt 10 is penetrated. Therefore, the temporary bolt 10 can be temporarily fixed more firmly, and the versatility of the temporary bolt 10 can be enhanced.

(6) In the present embodiment, the end of the cylindrical member 14 provided in the through hole 11h of the main body 11 projects outward from the outer circumference of the main body 11. As a result, the nut 13 is locked to the cylindrical member 14 on the base end portion 11b side, so that the nut 13 can be prevented from falling off.

(7) In the present embodiment, the upper flange 21 and the lower flange 22 of one of the two steel beams 20 to be connected are temporarily fixed by using the middle bolt B1, and the web of the steel beam 20 and the other steel frame are temporarily fixed. The upper flange 21 and the lower flange 22 of the beam 20 are temporarily fixed by using temporary bolts 10. As a result, the steel beam 20 can be temporarily fixed with high accuracy.

This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
The temporary bolt 10 of the above embodiment includes one protruding member 15. The temporary bolt 10 is not limited to the configuration including one protrusion member 15, and may include two or more protrusion members.
For example, the temporary bolt 40 shown in FIG. 8 has a main body portion 41 having a tip portion 41t having a tapered shape, a hole 42, and a threaded portion 41s. The hole 42 extends in the radial direction in the cylindrical portion of the main body portion 41 on the base end portion 41b side from the tip end portion 41t, and is formed through the main body portion 41.

Two protrusions 45 are arranged in the hole 42. Like the protrusion member 15, each protrusion member 45 has a cylindrical shape having an inclined surface, and the inclined surface is arranged so as to project outward from the openings on both sides of the hole 42. The protrusion member 45 is arranged in the hole 42 so that the protrusion length of the protrusion member 45 is longer on the base end portion 41b side of the main body portion 41 and shorter on the tip end portion 41t side in the tip portion side portion 45t. The longest axial length of the protrusion member 45 is shorter than the radius of the main body 41. Therefore, when the two protrusion members 45 are pushed in from the outside diameter direction, the base end portion side portion 45b of the protrusion member 45 can enter the inside of the outer shape of the main body portion 41.

A spring 46 is fixed to the rear end of the protrusion 45 on the axial direction via a recess 45h. The spring 46 is arranged in the hole 42 so as to be sandwiched between the protrusion members 45 on both sides.
Further, as shown in FIG. 9, grooves 45g are formed on both side surfaces of each protrusion member 45. The groove 45g is provided so as to extend in the axial direction of the protrusion member 45.
Then, the stopper pin 47 is driven and fixed from the outside of the main body 41 of the temporary bolt 40 so as to engage with the groove 45 g of the protrusion member 45, so that the groove 45 g is guided by the stopper pin 47. While doing so, the protrusion member 45 moves to prevent the protrusion member 45 from falling out of the hole 42.

Even when the temporary bolt 40 is used, the protrusion member 45 is pressed and positioned in the hole 42 to pass through the fixing hole of the splice plate for temporary fixing and the fixing hole of the steel beam. Then, when the protrusion member 45 passes through the fixing hole, it protrudes in the out-diameter direction by the force of the compressed spring 46, so that the protrusion member 45 does not come out of the fixing hole and is temporarily fixed.
Therefore, the temporary bolt 40 has two protruding members 45 that project in the opposite directions in the hole 42. As a result, the two protrusions 45 are locked to the splice plate 31, so that the temporary bolts 40 can be more reliably returned from the fixing holes 23h and 31h.

The temporary bolt 10 of the above embodiment includes a substantially cylindrical protrusion member 15 having an inclined surface. The shape of the protrusion member 15 is not limited to the cylindrical shape. For example, it may have a cylindrical shape, a hemispherical shape, a shape such as a half of a rugby ball, or a rectangular parallelepiped shape. In this case, when temporarily fixing with the temporary bolt, it is preferable that the base end side of the temporary bolt is longer than the tip end side so that the contact area between the splice plate and the temporary bolt becomes large.

In the temporary bolt 10 of the above embodiment, the cylindrical member 14 arranged in the through hole 11h of the main body 11 is projected in the radial direction, and the nut 13 is locked. The retaining of the nut 13 is not limited to the cylindrical member 14.

For example, as shown in FIG. 10, a head portion 64 integrated with the main body portion 61 may be provided at the base end portion 61b of the temporary bolt 60. The temporary bolt 60 also has a tip portion 61t, and a thread portion 61s into which the nut 13 is screwed is provided on the tip portion 61t side of the head portion 64. Then, by holding the head 64 in the electric tool for tightening the bolt and pushing it in, the temporary bolt 60 can be efficiently inserted into the fixing hole of the steel beam and the fixing hole of the splice plate.

In the temporary bolt 10 of the above embodiment, the nut 13 is screwed into the threaded portion 11s of the main body portion 11 in order to make the length L2 from the protrusion member 15 to the nut 13 variable. When the member to be fastened has a uniform thickness in advance, the nut 13 may be fixed to the main body 11.
For example, the temporary bolt 70 shown in FIG. 11 may be used. The temporary bolt 70 has a main body portion 71 having a tapered tip portion 71t and a bolt head portion 73. As a result, the formation of the thread portion can be omitted.

-In the temporary bolt 10 of the above embodiment, in the main body portion 11, a portion other than the tip portion 11t and the thread portion 11s is formed in a cylindrical shape. These shapes of the main body 11 of the temporary bolt 10 are not limited to the cylindrical shape. For example, as shown in FIG. 12, a temporary bolt 80 having a tapered main body portion 81 and a bolt head portion 83 may be used. The temporary bolt 80 has a tapered main body portion 81 that gradually extends from the end surface of the tip portion 81t to the bolt head portion 83. In this case, even if the holes in the flanges and webs of the steel beam and the holes in the splice plate sandwiching them do not match neatly, the tapered portion of the main body 81 functions as a drift pin, and the temporary bolt 80 , The position of the holes can be adjusted as they are inserted into the stacked fixing holes.

-In the temporary bolt 10 of the above embodiment, the thread of the thread portion 11s is formed of a standard screw. The thread used for the temporary bolt is not limited to this, and a thread larger than the standard thread may be used.

In the above embodiment, the upper flange 21 and the lower flange 22 of one of the two steel beams 20 to be connected are temporarily fixed by using the middle bolt B1, and the web of the steel beam 20 and the other steel beam are temporarily fixed. The upper flange 21 and the lower flange 22 of 20 were temporarily fixed by using temporary bolts 10. The method of temporarily fixing using the temporary bolt 10 is not limited to the case where it is used in combination with the medium bolt. For example, temporary fixing may be performed using only the temporary bolt 10, or temporary fixing may be performed by using the temporary bolt 10, the middle bolt, and the pin provided with no screw or protrusion member in combination.

Next, the technical idea that can be grasped from the above embodiment and another example will be added below.
(A) The fastening member for temporary fixing according to claim 2, wherein the tip end side of the protrusion is located closer to the center than the outer shape of the main body.
(B) The temporary fixing according to claim 3, wherein the main body portion is provided with a retaining member protruding in the out-of-diameter direction at a position on the base end portion side of the locking portion. Fastening member for.
(C) The temporary fixing fastening member according to (b), wherein the retaining member is a cylindrical member that penetrates the main body.
(D) A temporary fixing method in which a member to be fastened in which a plurality of fixing holes are formed is overlapped and fastened by using a temporary fixing fastening member.
The temporary fixing fastening member is an elastic body arranged in a cylindrical main body portion, a locking portion provided in the main body portion, and a hole formed in the main body portion at a position separated from the locking portion. With a protruding member protruding from the inside of the main body in the outward diameter direction.
After stacking the members to be fastened so that the fixing holes are aligned,
The temporary fixing fastening member is inserted into the fixing hole in a state where the protruding member of the temporary fixing fastening member is pressed from the outside diameter direction and moved inward from the outer diameter of the main body portion.
A temporary fixing method, characterized in that when the temporary fixing fastening member penetrates the fastening target member, the protruding member protrudes in the outer diameter direction and is locked to the temporary fixing target member.

B1 ... Medium bolt, L1 ... Thickness, L2 ... Length, R1 ... Outer diameter direction, 10,40,60,70,80 ... Temporary bolt as a fastening member for temporary fixing, 11,41,61,71,81 ... Main body, 11b, 41b, 61b ... Base end, 11h ... Through hole, 11s, 41s, 61s ... Threaded part, 11t, 41t, 61t, 71t, 81t ... Tip, 12, 42 ... Hole, 13 ... Nut as a locking portion, 14 ... Cylindrical member as a retaining member, 15, 45 ... Projection member, 15b, 45b ... Base end side portion, 15g, 45g ... Groove, 15h, 45h ... Recess, 15t, 45t ... Tip side part, 16,46 ... spring as elastic body, 17,47 ... stopper pin, 20 ... steel beam, 21 ... upper flange, 22 ... lower flange, 23 ... web as member to be fastened, 23h, 31h ... fixing hole, 31 ... splice plate as a member to be fastened, 64 ... head as a retaining member, 73, 83 ... bolt head as a locking portion.

Claims (3)

Cylindrical body and
A locking portion provided on the main body and
A provisional body characterized in that an elastic body arranged in a hole formed at a position separated from the locking portion in the main body portion is provided with a protruding member protruding from the inside of the main body portion in the outer diameter direction. Fastening member for fixing. The temporary fixing fastening member according to claim 1, wherein the protruding member has an inclined surface whose tip end side of the main body portion is lower than that of the locking portion side. A screw thread is formed at the base end portion of the main body portion.
The temporary fixing fastening member according to claim 1 or 2, wherein the locking portion is a nut screwed into the thread.

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