JP7335604B2 - construction fasteners - Google Patents

Description

The present invention relates to fasteners used in construction to construct concrete walls.

For example, a holding member that contacts a round or square single pipe (butter material) and holds the single pipe in a concrete formwork, a bolt shaft that holds the holding member, and an elastic member that inserts the bolt shaft The holding member has a through hole through which the bolt shaft is inserted, and a contact portion on both sides or one side of the through hole that contacts the single pipe, and the contact portion has a straight portion. In addition, both or one end is bent toward the single pipe, and the longitudinal length of the linear portion is longer than the contact length when the held single pipe is in contact with the contact portion. A fastener for use in attaching a long, single pipe has been proposed (see, for example, Patent Document 1).

According to the clamping tool, since the elastic member and the tube into which the bolt shaft is inserted are provided, there is no risk of over-tightening the clamping tool when the single pipe is attached to the formwork. Even if there is only one pipe, it can be stably attached to the formwork, and the single pipe can be easily attached to the formwork in a straight line in the longitudinal direction.

However, one or two upper and lower single pipes (butter material) are sandwiched between the bolt shaft screwed to the corn (cone) placed on the inner surface of the form using a fastener, and the holding member from its outer surface with a nut, until the holding member reaches the vicinity of the front of the single tube pipe, the operator holds the holding member in a vertical posture with one hand and the other hand with the other hand. Tightening the nut by turning it with a tool is complicated and requires a lot of labor. In addition, there were problems such as deterioration of safety due to fatigue and loss of efficiency of formwork construction.

JP 2017-206936 (pages 1 to 15, FIGS. 3 to 11)

The present invention solves the problems described in the background art, and when attaching a retaining member from the outer surface of the bolt with a nut that sandwiches the butter material to the bolt that is threadedly connected to the cone placed on the inner surface of the formwork. Another object of the present invention is to provide a fastening tool for construction that can fasten a formwork only by turning a nut with one hand of an operator.

In order to solve the above problems, the present invention was conceived of connecting a nut to a holding member so as to be freely rotatable.
That is, the fastener for construction work of the present invention is a fastener for construction work comprising a holding member and a nut, wherein the nut is connected to the holding member so as to be freely rotatable. Characterized by

According to the fastener defined in this way, the following effects (1) and (2) are obtained.
(1) Since the nut is freely rotatably connected to the holding member, the operator can easily rotate the nut with a tool such as a wrench with one hand to attach the holding member to the outer surface of the formwork. It is possible to easily and quickly abut and tighten the butter material arranged in a horizontal position along the line.
(2) Due to the above effect (1), it is possible to safely perform construction work using forms in a short period of time and efficiently.

In addition, when constructing concrete walls and columns, the construction is carried out on the outside of a pair of formwork vertically installed parallel to each other, and a pair of upper and lower A clamping fitting including a holding member that holds the butter material by being screwed to a bolt penetrating between square or round butter materials and a pair of molds arranged on the inner surface of each form Separators (tie bolts) that connect the cones by screws are used to maintain a constant gap between the pair of forms, and the gap between the forms is filled with ready-mixed concrete and cured. .
Further, the holding member is, for example, a box-shaped body that is formed by bending a metal plate and has a substantially rectangular parallelepiped shape as a whole, or a rectangular shape when viewed from the front and the back, and an arc shape or a flat mountain shape when viewed from the side. and has a through hole extending between its outer and inner surfaces, as will be described later.

Further, the nut includes a nut body, which is, for example, a hexagonal nut or a square nut, and a connecting portion, which will be described later, extending coaxially with a female threaded hole passing through the nut body from the bottom surface of the nut body.
The formwork used for construction consists of, for example, thick plywood and a plurality of wooden square timbers fixed to the outer surface of the plywood at regular intervals along the vertical direction.
In addition, the butter materials used in the construction are rectangular or round steel pipes, or extruded aluminum alloy profiles having similar cross-sectional shapes.

In the fastener for construction according to the second aspect of the present invention, the nut includes a nut body and a connecting part extending from the bottom surface of the nut body, and the holding member has a through-hole. A hole is provided, and the connecting portion of the nut has an insert piece inserted into the through hole and an anchor piece adjacent to the inner wall surface of the retaining member.
According to this, the nut has an inserting piece that surrounds the opening of the female screw hole from the bottom surface of the nut body and extends along the axial direction and is inserted into the through hole provided in the holding member. An anchor piece protruding substantially radially from the distal end side is adjacent to the inner wall surface of the holding member. The nut is therefore connected to the holding member in a freely rotatable manner. Therefore, the effect (1) described above can be reliably obtained, and the effect (2) described above can also be achieved.

A female screw hole is screwed into the inner peripheral surface of the nut main body. The connecting portion communicates with the female threaded hole of the nut body and extends from the periphery of the female threaded hole on the bottom surface of the nut body. Since a bolt is screwed into the nut, the connecting portion should be coaxial with the female screw hole, and its inner peripheral diameter should be equal to or larger than the diameter of the root portion of the female screw hole. The connection part may be formed integrally with the nut body or may be a separate body.
The outer diameter of the insertion piece of the connecting portion is smaller than the inner diameter of the through hole of the holding member, so that the former is freely fitted with respect to the latter.
It is preferable that the anchor piece is an insertion piece whose distal end side is plastically deformed (third aspect). This is to suppress an increase in the number of parts and to easily connect the nut and the holding member by caulking or the like.

In addition to a ring-shaped anchor piece formed by plastically deforming the distal end side of a cylindrical insertion piece along the inner wall surface of the holding member, a plurality of notches are made in the distal end side of the cylindrical insertion piece to form a holding member. There is also a radial anchor piece that is plastically deformed along the inner wall surface of the .
The anchor piece may be separate from the insert piece.
The distance between the anchor piece and the bottom surface of the nut body is slightly longer than the thickness of the holding member to reduce the contact resistance between the anchor and the back surface of the nut body and the holding member, allowing the nut and holding member to rotate freely. ensure

When the anchor piece is plastically deformed, it is preferable that the peripheral edge on the inner wall surface side of the through hole of the holding member is tapered (fourth aspect). When the leading end of the connecting portion is plastically deformed along the inner wall surface of the holding member to form an anchor portion, this tapered surface aligns the connecting portion with the through hole of the holding member. This stabilizes the connection structure between the nut and the holding member. Furthermore, since the contact area between the anchor portion and the holding member is increased due to the tapered surface, the durability of the contact portion is improved, and the tightening tool is suitable for repeated use.
In addition, in the construction fastener according to the fifth aspect of the present invention, the center of gravity of the holding member does not coincide with the center of the through hole in the longitudinal direction of the holding member.

According to this, by using the holding member such that the center of gravity of the holding member is positioned lower than the center of the through hole, the operator does not grab the holding member and maintains it in a vertical position while flapping. It can be brought close to or in contact with the material side.
When the center of gravity of the holding member does not coincide with the center of the through hole in the long side direction of the holding member, the center of the through hole is shifted toward one end side of the center in the long side direction of the holding member. Alternatively, a form in which the center of the through-hole is provided in the central portion of the holding member in the long side direction and the weight of one end side is made larger than that of the other end side is exemplified.

1 is a partial vertical cross-sectional view showing a usage state of a construction fastener of the present invention; FIG. (A) is a perspective view of the fastener, and (B) is a cross-sectional view taken along line BB in (A). (A1) to (A3) are perspective views or bottom views from different viewing angles of nuts constituting the fastener, (B1) and (B2) are schematic diagrams of the nut manufacturing process, and (B3) is , (B2). (A) and (B) are a perspective view and a side view showing a fastener for construction including holding members of different forms. It is a partial enlarged sectional view near the nut in the said fastener of 2 forms.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated.
FIG. 1 is a partial vertical cross-sectional view showing the state of use of a construction fastener (hereinafter simply referred to as a fastener) 1 according to the present invention.
For construction, for example, when constructing a concrete wall, as shown in FIG. The butter material 13 is screwed to a bolt 12 that penetrates between a pair of upper and lower rectangular steel pipes arranged in a horizontal posture perpendicular to a plurality of rectangular bars 14 fixed vertically to the outer surface of the pipe. With the fastener 1 of the present invention including the holding member 2 for holding, and the separator (tie bolt) 18 for screwing between the cones 16 arranged on the inner surface of each mold 15 between the pair of molds 15, After filling ready-mixed concrete (not shown) in the gap while maintaining the gap between the pair of forms 15, curing is performed so as to form concrete.

A plurality of wooden rectangular timbers 14 are fixed to the outer surface of the mold 15 at substantially equal intervals along the vertical direction, and bolts 12 are arranged between the rectangular timbers 14 .
Each cone 16 is individually screwed to the bolt 12 on the same side by a small-diameter bolt 17 passing through the adjacent formwork 15 .
A large-diameter disk 12a is integrally provided at the outer end of the bolt 12 to prevent the fastener 1 from falling off.

As shown in FIGS. 2(A) and 2(B), the fastener 1 includes a holding member 2 having a generally rectangular shape when viewed from the front and an arc shape which is flat when viewed from the side. and a nut 7 which is freely rotatably connected.
For example, the holding member 2 is made by punching a metal plate having a thickness of about 2 mm into a predetermined shape by pressing (not shown) and then bending it. Alternatively, it has a pair of upper and lower flanges 3 extending obliquely from the lower end and a pair of front and rear side walls 4 surrounded by them. The inner edge 5 of each side wall 4 is composed of a vertical straight line, and the length of the straight line is the sum of the vertical dimension of the upper and lower pair of butter members 12 and the outer diameter of the bolt 10, as shown in FIG. is considered to be larger than

Further, when the fastener 1 is tightened, the pair of upper and lower flanges 3 come close to the upper surface or the lower surface of the pair of upper and lower butter materials 12 as shown in FIG.
Further, a horizontal through hole 6 is formed at the top between the pair of upper and lower inclined sides 2a and 2b. A nut 7 is freely rotatably connected to the holding member 2 having the through hole 6 . A conical tapered surface 6a is positioned on the peripheral edge of the through hole 6 on the side of the inner surface 2c of the holding member 2. As shown in FIG.
In addition, bulging portions 4a that curve outward are located symmetrically in the central portions of the pair of side walls 4. As shown in FIG.
In addition, the center of gravity of holding member 2 does not coincide with the center of through hole 6 . Therefore, for example, as shown in FIG. 2(B), a weight w is welded to the inner surface 2c of the inclined side 2b on the lower side, or, as will be described later, the length of the inclined side 2b is The length is longer than the length of the inclined side 2a.

As shown in FIGS. 3A1 and 3A2, the nut 7 includes a nut body 8 having a female screw hole n similar to that of a normal hexagonal nut, and an axial direction of the female screw hole n from the bottom surface of the nut body 8. and a connecting portion 9 extending along the As will be described later, the connecting portion 9 includes a cylindrical insertion piece 10 to be inserted into the through hole 6 of the holding member 2 and a circular ring extending substantially radially and slightly obliquely from the distal end side of the insertion piece 10 . It consists of a ring-shaped anchor piece 11 . The anchor piece 11 is adjacent to the tapered surface 6a of the through hole 6 of the holding member 2. As shown in FIG.
Between the bottom surface of the nut body 8 and the holding member 2, between the inner peripheral surface of the through hole 6 and the outer peripheral surface of the insertion piece 10, and between the anchor piece 11 and the inner side surfaces 2c of the inclined sides 2a and 2b. A minimum gap (clearance) is set between them, as will be described later.

The fastener 1 including the nut 7 is manufactured, for example, by the following method.
As shown in FIG. 3(B1), a nut body 8 having a hexagonal prism shape and a thin cylindrical portion 9a extending cylindrically from the bottom surface of the body 8 are formed by warm forging a stainless steel rod material. An integral nut intermediate material 7a is molded. Next, along the central axis of the nut body 8 of the intermediate material 7a, a through hole having a diameter slightly smaller than the inner diameter of the cylindrical portion 9a is bored, and the inner peripheral surface of the through hole is tapped to form a female screw. Engrave.
Further, with the tubular portion 9a inserted into the through hole 6 of the holding member 2, a flat conical stamping die (not shown) is applied to the leading end of the tubular portion 9a of the intermediate material 7a. Plastic working is performed by pressing along the axial direction of the portion 9a.

As a result, as shown in FIGS. 3(B2) and 3(B3), a conical anchor piece 11 extending substantially radially and slightly obliquely is formed on the distal end side of the cylindrical portion 9a.
As a result, as shown in FIG. 2B, the anchor piece 11 is adjacent to the tapered surface 6a of the through hole 6 of the holding member 2, and the base end side of the tubular portion 9a becomes an insertion piece 10. It is inserted into the through hole 6 of the holding member 2 as shown in 2(B). As a result, the connecting portion 9 made up of the inserting piece 10 and the anchoring piece 11 is formed, thereby obtaining the nut 7, and the tightening member in which the nut 7 is connected to the holding member 2 so as to be freely rotatable. Tool 1 is produced.

According to the fastener 1 as described above, as shown in FIG. The bolts 12 individually screwed together are horizontally protruded from between the square members 14 fixed to the outer surface of the formwork 15, and a pair of upper and lower butter members 13 are arranged along the upper and lower sides of the plurality of bolts 12. Keep it horizontal.
In this state, the main body 8 of the nut 7 of the fastener 1, which is previously threaded with the male thread of each bolt 12 and the female thread n, is rotated with a wrench held with one hand.
During this time, the holding member 2 maintains a vertical posture with the inclined side 2b positioned downward without synchronizing with the rotation of the nut 7 due to the weight w.

As the nut 7 is moved toward the butter material 13 by rotating the nut 7, the side walls 4 of the holding member 2 pressed by the nut 7 are pushed so that the inner edges 5 of the side walls 4 are aligned with the outer surfaces of the butter material 12. abuts linearly on the
As a result, as shown in FIG. 1, the holding member 2 can be tightened by the nuts 7 screwed to the bolts 12 so as to push the upper and lower butter members 13 toward the formwork 15 side. As a result, the pair of left and right formwork 15 can be firmly connected to each other while maintaining a constant distance by the spacer 18 or the like.
Therefore, it can be easily understood that the fastener 1 can obtain the effect (1), and the effect (2) can be obtained due to the effect (1). Moreover, it is clear that the effect (3) is also provided.

FIGS. 4A and 4B are a perspective view and a side view showing a fastener 1x including holding members 2x of different forms.
As shown in FIGS. 4A and 4B, the fastener 1x includes a holding member 2x that connects the nut 7 so as to be freely rotatable. As shown, the holding member 2x has a pair of upper and lower inclined sides 2a and 2b and a pair of left and right side walls 4. The inner edge 5 of each side wall 4 has a pair of upper and lower arc-shaped sides. recesses r1 and r2 are formed. The recesses r1 and r2 are inserted with outer peripheral surfaces of butter material of round steel pipes (not shown). Also, in the drawing, the length (height dimension) L1 of the upper inclined side 2a is shorter than the length L2 of the lower inclined side 2b. That is, the center of the through hole 6 into which the insertion piece 10 is inserted in the connection portion 9 of the bolt 7 is located above the center of gravity (not shown) of the holding member 2x.

FIG. 5 is a cross-sectional view showing the nut 7 and part of the holding member 2 adjacent to the nut 7 in the fastener 1, 1x. As illustrated, the insertion piece 10 of the connecting portion 9 of the nut 7 that is inserted into the through hole 6 has a gap s between itself and the inner wall surface of the through hole 6 . Also, the anchor piece 11 of the connecting portion 9 has a similar gap s between the adjacent tapered surface 6a. Further, the same gap s as described above is arranged between the bottom surface of the nut body 8 and the inclined sides 2a and 2b of the holding member 2. As shown in FIG. The arrangement of these gaps s ensures that the nut 7 is freely rotatably connected to the retaining member 2 .
Note that the gap s is appropriately selected within the range of 0.10 to 0.50 mm. However, the gap s between the bottom surface of the nut body 8 and the inclined sides 2a and 2b of the holding member 2 may be in the range of 0.05 to 2.00 mm.
According to the tightening tool 1x, in the formwork construction when the butter material made of a pair of upper and lower round steel pipes is horizontally arranged on the plurality of rectangular timbers 14 fixed to the outer surface of each formwork 15, the above effect ( 1) and (2) can be obtained, and the above effect (3) is also provided.
The lengths L1 and L2 of the inclined sides 2a and 2b are made the same so that the center of the through hole 6 and the center of gravity of the holding member 2x are aligned, and a similar weight is applied to the inner surface 2c of the lower inclined side 2b. It is possible to obtain the effects (1) and (2) even if w is fixed.

The present invention is not limited to each form described above.
For example, the inclined sides 2a and 2b of the holding members 2 and 2x may have a flat triangular shape that slightly protrudes outward when viewed from the side.
Further, the holding member 2x may be provided with a pair of upper and lower flanges 3. As shown in FIG.

Further, the nut body 8 of the nut 7 is not limited to a hexagonal column, and may be a square column as a whole. A ring-shaped seat for reducing the contact area with the holding member 2 may protrude from the bottom surface of the nut body 8 along the outer side of the insertion piece 10 .
In addition, the connecting portion 9 of the nut 7 may have two or more slits symmetrically formed along the axial direction of the insertion piece 10 and the radial direction of the anchor piece 11 .

According to the present invention, when attaching the holding member from the outer surface of the bolt, which is threadedly connected to the cone disposed on the inner surface of the form, with the butter material sandwiched therebetween, the nut is pressed by the operator with one hand. It is possible to provide a clamping tool for form work that can tighten the form only by turning it.

1, 1x: Fastener for form work 2, 2x: Holding member 2c: Inner surface of holding member 6: Through hole 6a: Tapered surface 7 ………………Nut 8………………Nut main body 9………………Connecting portion 10………………Insertion piece 11………………Anchor piece

Claims (3)

A construction fastener comprising a holding member and a nut,
A fastener for construction work in which the nut is freely rotatably connected to the holding member,
The nut comprises a nut body and a connecting part extending from the bottom surface of the nut body,
The holding member is provided with a through hole,
the connecting portion of the nut has a cylindrical insertion piece inserted into the through hole and an anchor piece adjacent to the inner wall surface of the holding member;
The female threaded hole of the nut has a smaller diameter than the inner diameter of the insert piece,
Construction fasteners. In the holding member, the peripheral edge of the inner wall surface of the through hole is a tapered surface,
The fastener for construction according to claim 1. the center of gravity of the holding member does not coincide with the center of the through hole in the longitudinal direction of the holding member;
The fastener for construction according to claim 1 or 2.

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