JP2020197019A - Bolt support unit, and fastener - Google Patents

Abstract

To provide a bolt support unit and a fastener capable of improving workability, installation accuracy, and reliability relating to installation of a bolt with a simple configuration.SOLUTION: A bolt support unit 1 comprises: a bolt 2 including a male screw portion 2a; and a fastener 5 fixed to the bolt 2. The fastener 5 includes a sleeve 10 comprising: a body 20 including a through hole 21 extending in an axial direction of the bolt 2; a first cut out portion 30 in which a side wall 24 of the body 20 forming the through hole 21 is cut out in the axial direction; and a female screw portion 40 formed on an inner peripheral face of the through hole 21. In a state where the body 20 is tilted with respect to the axial direction, the bolt 2 is inserted through the first cut out portion 30 into the body 20, and then the body 20 is tilted to a direction along the axial direction. Thus, the female screw portion 40 is engaged with the male screw portion 2a from a crossing direction crossing a screwing direction to the male screw portion 2a, and the sleeve 10 is supported by the bolt 2 by keeping the engaging state.SELECTED DRAWING: Figure 8

Description

The present invention relates to a bolt support unit and a fastener.

In forming a reinforced concrete foundation in a building, it is necessary to position and support anchor bolts to be buried under the foundation at an arbitrary position before placing concrete. For example, Patent Document 1 describes an anchor bolt provided with a first jig for connecting the lower portions of a plurality of anchor bolts to each other and a second jig for connecting the upper portions of a plurality of anchor bolts to each other. Positioning jigs are disclosed.

The fixing means of the first and second jigs are each composed of a double nut whose height of the anchor bolt can be adjusted. It is said that by fixing the lower part of the anchor bolt to the first jig and fixing the upper part of the anchor bolt with the second jig, the lower part of the anchor bolt does not move at the time of placing concrete.

Further, in order to support the anchor bolts between the pair of formwork for forming the foundation, the support plate may be supported in a state of being bridged between the pair of formwork. In this case, the anchor bolt is inserted into the insertion hole formed in the support plate. Then, the height adjustment of the anchor bolt is performed by fixing the anchor bolt to the support plate while sandwiching the support plate up and down with a double nut.

Japanese Unexamined Patent Publication No. 2008-81980

When fixing the anchor bolts to the support plate with double nuts, the operator must screw the two nuts while repeatedly turning them to the fixing position of the anchor bolts with respect to the support plate, which improves the workability of installing the anchor bolts. Getting worse.

Further, while adjusting the height of the anchor bolt by screwing the double nut, the support plate must be fastened so as to sandwich the support plate with the double nut, and the anchor bolt must be fixed to the support plate. Therefore, the burden on the operator increases, the height of protrusion of the anchor bolt from the support plate varies, and the installation accuracy of the anchor bolt may decrease.

Also, in order to prevent the anchor bolts from moving when placing concrete, the upper and lower parts of the anchor bolts must be fixed with different jigs. Therefore, the configuration of the bolt support unit becomes complicated and large, and the workability related to the installation of the anchor bolts further deteriorates.

The present invention has been made in view of such a problem, and provides a bolt support unit and a stopper capable of improving workability, installation accuracy, and reliability related to bolt installation with a simple configuration. The purpose is to do.

In order to achieve the above object, the bolt support unit of the present invention includes a bolt having a male thread portion and a stopper fixed to the bolt, and the stopper is a through hole extending in the axial direction of the bolt. A sleeve having a main body having a through hole, a first notch portion in which the side wall of the main body forming the through hole is cut out in the axial direction, and a female thread portion formed on the inner peripheral surface of the through hole, and the main body is axially After inserting the bolt from the first notch into the main body in an inclined posture, by tilting the main body in the direction along the axial direction, the female threaded portion starts from the crossing direction that intersects the screwing direction with respect to the male threaded portion. Is engaged with the male threaded portion, and the sleeve is supported by the bolt by maintaining the engaged state.
Further, the stopper of the present invention comprises a sleeve used for the bolt support unit described above, and is fixed to the bolt described above.

According to the bolt support unit and the fastener of the present invention, it is possible to improve workability, installation accuracy, and reliability related to bolt installation with a simple configuration.

It is a perspective view which shows the installation state of the bolt support unit which concerns on one Embodiment of this invention. It is a perspective view of the sleeve of FIG. It is a side view of the sleeve seen from the A direction of FIG. It is a side view of the sleeve seen from the B direction of FIG. It is a side view of the sleeve seen from the C direction of FIG. It is a top view of the sleeve seen from the D direction of FIG. It is a bottom view of the sleeve seen from the E direction of FIG. (A) to (d): It is explanatory drawing which shows the construction procedure for installing a bolt support unit.

Hereinafter, the bolt support unit 1 according to the embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a perspective view of a bolt support unit 1 (hereinafter, also simply referred to as a support unit 1) in an installed state. In forming a reinforced concrete foundation in a building, the support unit 1 supports anchor bolts 2 (hereinafter, also simply referred to as bolts 2) to be buried under the foundation before placing concrete.

The bolts 2 are erected between a pair of formwork 3 for forming a foundation before the concrete is cast, and are positioned and held at an arbitrary height position at this time. The bolt 2 has a male threaded portion 2a over, for example, the entire axial direction thereof. In the present specification, in the installed state of the support unit 1, the axial direction of the bolt 2 is set to "axial direction", the radial direction of the bolt 2 is set to "diameter direction", and the circumferential direction of the bolt 2 is set to "circumferential direction". explain. Further, for convenience, the description will be given based on the vertical and horizontal directions shown in each figure, but these directions change depending on the actual installation situation of the support unit 1.

The support unit 1 includes a bolt 2, a support plate 4, and a stopper 5. The support plate 4 is bridged over a pair of formwork 3 and fixed to the upper surface 3a of the formwork 3 with bolts 6 or the like. The support plate 4 has an insertion hole 4a (see FIGS. 8B to 8D) into which the bolt 2 is inserted. A plate (not shown) may be fixed to the upper surface 3a of the formwork 3, and a double plate construction may be performed in which the support plate 4 is fixed to the upper surface of the plate.

The stopper 5 is composed of a sleeve 10, and the sleeve 10 is supported by engagement with the bolt 2, and the bolt 2 is supported by the support plate 4 while maintaining this engaged state. As a result, the stopper 5 is fixed to the bolt 2, and the bolt 2 is fixed to the support plate 4 via the stopper 5, so that the bolt 2 does not tilt between the pair of formwork 3 and the vertical direction is the axial direction. It is erected.

A tubular cover (not shown) may be placed on the tip of the bolt 2 to protect the bolt 2. Further, if the end surface of the cover is brought into contact with the upper surface of the sleeve 10 by mounting the cover, the sleeve 10 is further strengthened while more effectively preventing the sleeve 10 and the bolt 2 from tilting in the installed state of the stopper 5. Can be fixed to.

2 is a perspective view of the sleeve 10, FIG. 3 is a side view of the sleeve 10 seen from the A direction of FIG. 2, FIG. 4 is a side view of the sleeve 10 seen from the B direction of FIG. 2, and FIG. 5 is C of FIG. A side view of the sleeve 10 seen from the direction, FIG. 6 shows a top view of the sleeve 10 seen from the D direction of FIG. 2, and FIG. 7 shows a bottom view of the sleeve 10 seen from the E direction of FIG.

The sleeve 10 is supported by the support plate 4 in a state where the bolt 2 is inserted into the insertion hole 4a while maintaining the engagement state of the sleeve 10 with the bolt 2. The sleeve 10 includes a main body 20, a first notch 30, and a female thread 40, and further has a second notch 50, a pair of fixing arms 60, a third notch 70, and a support 80.

The main body 20 has a tubular shape having an outer shape of, for example, a cube or a rectangular parallelepiped, and has a through hole 21 extending in the axial direction. The through hole 21 is formed by penetrating the upper wall 22 and the lower wall 23 facing in the axial direction and being surrounded by a pair of side walls 24 and 25 facing in the radial direction and another pair of side walls 26 and 27, respectively. To. The first notch 30 is formed by notching the side wall 24 of the main body 20 from below in the axial direction.

The third notch 70 is in a direction different in axial direction from the first notch 30, that is, in the axial direction, at a position radially opposed to the side wall 25 of the main body 20, that is, the side wall 24 on which the first notch 30 is formed. It is formed by cutting out from above. The female threaded portion 40 is formed on the inner peripheral surface of the through hole 21 in the upper wall 22 and the lower wall 23, respectively. Each female thread portion 40 has the same thread pitch as the male thread portion 2a.

Each female thread portion 40 is formed at a position facing the first notch portion 30 and the third notch portion 70 in the radial direction. Not limited to this, the female thread portion 40 may be provided only at one opposite position of the first notch portion 30 and the third notch portion 70. The second notch 50 is formed by notching the side wall 25 of the main body 20 in the radial direction. In the installed state of the support unit 1, the support plate 4 is positioned at the second notch 50.

By forming the first notch 30, the third notch 70, and the second notch 50 in the main body 20, a semicircular inner peripheral surface is formed on the upper wall 22 and the lower wall 23, and the through hole 21 is formed. Will be formed only on these inner peripheral surfaces. The pair of fixed arms 60 extend radially away from the main body 20 with an opening of the first notch 30, and have a tip 61 bent axially toward the second notch 50. Each has. In the case of the present embodiment, the pair of fixed arms 60 extend radially parallel to the upper wall 22 which is one end wall of the main body 20.

The support portion 80 projects axially from the lower wall 23, which is the other end wall of the main body 20, and abuts on the bolt 2 in the radial direction when the sleeve 10 is engaged with the bolt 2. Specifically, the support portion 80 has a broken annular shape having the abutment 81, and when the sleeve 10 is tilted with respect to the bolt 2 along the axial direction, the bolt is radially inward from the abutment 81 to the support portion 80. 2 is positioned.

As described above, in the main body 20, the first notch 30 and the third notch 70 are formed in different directions in the axial direction and at opposite positions in the radial direction, and the second notch 50 is formed in the radial direction. It is formed. As a result, the main body 20 is formed with a cavity 28 penetrating in the radial direction between the pair of side walls 24 and 25. Then, female threaded portions 40 are formed on the inner peripheral surfaces of the through holes 21 located on the lower side and the upper side of the cavity 28, respectively.

Further, by forming the first cutout portion 30 and the third cutout portion 70 in the main body 20, the main body 20, that is, in the space from the first cutout portion 30 and the third cutout portion 70 to the cavity 28 and the through hole 21. While tilting the sleeve 10 in the axial direction, the bolt 2 can be positioned in the through hole 21 and, by extension, can be engaged with each female thread portion 40 formed on the inner peripheral surfaces of the upper wall 22 and the lower wall 23.

Hereinafter, the construction procedure for installing the support unit 1 will be described with reference to FIGS. 8A to 8D. 8 (a) to 8 (d) schematically show the sleeve 10 as a partial vertical cross section in order to explain the construction process of the support unit 1.

As shown in FIG. 8A, first, the main body 20 is tilted with respect to the axial direction, in other words, the sleeve 10 is set so that the upper wall 22 and the lower wall 23 of the main body 20 are substantially parallel to the axial direction. In this state, the bolt 2 is inserted from the first notch 30 into the main body 20. As a result, the bolt 2 can be projected from the third notch 70, and the bolt 2 is positioned in the cavity 28 of the main body 20. The bolt 2 may be inserted from the third notch 70 into the main body 20.

Next, as shown in FIG. 8B, the support plate 4 is inserted through the insertion hole 4a from the upper tip of the bolt 2, and the assembly including the bolt 2 and the sleeve 10 formed in FIG. 8A is formed. Position above. At this time, the height of the bolt 2 protruding from the support plate 4 is determined by adjusting the height positions of the sleeve 10 and the support plate 4 with respect to the bolt 2.

Next, as shown in FIG. 8C, the main body 20, that is, the sleeve 10 is tilted in the direction of the arrow about the support plate 4 in the axial direction. As a result, as shown in FIG. 8D, each female threaded portion 40 is moved from the crossing direction (in other words, the radial direction) intersecting the threading direction (in other words, the axial direction) of the bolt 2 with respect to the threaded portion 2a. The sleeve 10 is supported by the bolt 2 by being engaged with the screw portion 2a and maintaining this engaged state (hereinafter, also referred to as the above-mentioned engaged state).

At the same time, the support plate 4 is positioned in the second notch 50 in a state where the bolt 2 is inserted into the insertion hole 4a of the support plate 4 while maintaining the engaged state, and further, each of the pair of fixing arms 60. The tip portion 61 is locked to the support plate 4. As a result, the sleeve 10 is firmly supported by the support plate 4.

Further, when the support portion 80 is brought into contact with the bolt 2 in the radial direction, rattling of the sleeve 10 with respect to the bolt 2 is suppressed, and the sleeve 10 is more firmly supported by the support plate 4. In this way, the stopper 5 which is the sleeve 10 is firmly supported by the bolt 2, and the bolt 2 is firmly supported by the support plate 4 via the stopper 5.

Then, the assembly including the bolt 2, the sleeve 10, and the support plate 4 is fixed to the pair of formwork 3 on the support plate 4. This completes the installation of the support unit 1. It is also possible to install the support unit 1 by attaching the assembly formed in FIG. 8A to the support plate 4 previously fixed to the mold 3.

As described above, in the support unit 1 of the present embodiment, by engaging each female thread portion 40 with the thread portion 2a of the bolt 2 from the intersecting direction, the sleeve 10 which is the stopper 5 is positioned on the bolt 2 with one touch. can do. Therefore, it is possible to improve workability, installation accuracy, and reliability related to the installation of the bolt 2 with a simple configuration.

More specifically, by providing the first notch 30 in the main body 20 of the sleeve 10, the bolt 2 is provided from the first notch 30 to the main body 20 only by inclining the main body 20 of one member in the axial direction. It is possible to insert it. Further, it is possible to engage each female threaded portion 40 of the sleeve 10 with the threaded portion 2a of the bolt 2 from the intersecting direction only by tilting the main body 20 in the axial direction.

That is, when positioning the sleeve 10 with respect to the bolt 2, it is not necessary to screw the double nut, that is, the two nuts in the screwing direction while repeatedly turning the two nuts with respect to the threaded portion 2a of the bolt 2. As a result, the positioning work of the sleeve 10 with respect to the bolt 2 can be greatly simplified and the work time can be significantly shortened only by using the sleeve 10 made of the main body 20 of one member. Therefore, the workability of the construction related to the installation of the support unit 1 is greatly improved.

Further, by forming the engaged state, it is possible to adjust the height of the bolt 2 in advance. Therefore, as in the conventional case, when fixing the bolt 2 to the support plate 4, the work of adjusting the height of the bolt 2 by screwing the double nut and the work of sandwiching and fastening the support plate 4 with the double nut are performed at the same time. You don't have to do it. Therefore, the burden on the operator is reduced, the protruding height of the bolt 2 from the support plate 4 is less likely to vary, and the installation accuracy of the bolt 2 is improved.

Further, each female threaded portion 40 of the sleeve 10 has the same pitch as the threaded portion 2a of the bolt 2. As a result, the engaged state can be surely performed by matching the threads and valleys of the threads with each other. As a result, the bolt 2 can be more firmly fixed by the support plate 4, the bolt 2 is more effectively prevented from tilting, and the vertical standing of the bolt 2 can be effectively maintained. Therefore, the installation accuracy of the bolt 2 is further improved, and the reliability of the support unit 1 is further improved.

Further, each female thread portion 40 is formed at a position where the first notch portion 30 and the third notch portion 70 face each other in the radial direction of the bolt 2. As a result, when the sleeve 10 is inserted through the bolt 2 via the first notch 30 and the third notch 70 and the main body 20 is tilted in the axial direction, each female thread 40 of the sleeve 10 Can be securely engaged with the threaded portion 2a of the bolt 2 from the crossing direction. Therefore, when the engaged state is maintained in the process of installing the support unit 1, the sleeve 10 is unlikely to fall off, and the workability of the construction related to the installation of the support unit 1 is further improved.

Further, since the second notch 50 is formed in the main body 20, a wide cavity 28 can be secured in the main body 20, so that the sleeve 10 is inserted through the bolt 2 and the main body 20 is tilted in the axial direction. The work of making the work can be performed more smoothly, and the workability of the construction related to the installation of the support unit 1 is further improved. Further, the weight of the sleeve 10 can be reduced.

Further, since the support plate 4 is positioned at the second notch 50, the sleeve 10 is supported by the support plate 4 so as to be sandwiched between the main body 20. As a result, the installation accuracy of the bolt 2 is further improved, and the reliability of the support unit 1 is further improved.

Further, since the wide cavity 28 can be secured in the main body 20 by forming the third notch 70 in the main body 20, the sleeve 10 is inserted through the bolt 2 and the main body 20 is tilted in the axial direction. The work of making the work can be performed more smoothly, and the workability of the construction related to the installation of the support unit 1 is further improved. Further, the weight of the sleeve 10 can be reduced.

Further, the sleeve 10 is provided with a pair of fixing arms 60 having a tip portion 61, and the main body 20 is aligned in the axial direction with the bolt 2 inserted into the insertion hole 4a of the support plate 4 while maintaining the engaged state. Tilt in the direction. As a result, each tip portion 61 is locked to the support plate 4 located in the second notch portion 50, and the sleeve 10 is supported by the support plate 4.

With such a configuration, the main body 20 can be more firmly fixed to the support plate 4 by a simple operation of tilting the sleeve 10. Therefore, it is possible to prevent the bolt 2 from tilting and maintain the vertical standing of the bolt 2, further improving the installation accuracy of the bolt 2 and further improving the reliability of the support unit 1.

Further, since the sleeve 10 has the support portion 80, the support portion 80 is brought into contact with the bolt 2 in the radial direction in the engaged state. As a result, when the engaged state is maintained, the sleeve 10 is less likely to fall off, so that the workability of the construction related to the installation of the support unit 1 is further improved.

Although the description of the embodiment of the present invention is completed above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, after inserting the bolt 2 from the first notch 30 into the main body 20 in a posture in which the main body 20 is tilted with respect to the axial direction, the main body 20 can be tilted in the axial direction, and thus the above-mentioned engagement. The third notch 70 and the second notch 50 do not necessarily have to be formed in the sleeve 10 which is the stopper 5 as long as the state can be formed. The same applies to the pair of fixed arms 60 and the support portion 80.

Further, the construction procedure related to the installation of the support unit 1 described with reference to FIGS. 8A to 8D is not strictly limited to the described one. Further, the shapes of the above-mentioned members constituting the support unit 1 and the positions of the respective parts on the sleeve 10 are not necessarily strictly limited to those described above as long as the above-mentioned functions can be achieved. ..

Further, the support unit 1 and the stopper 5 are not limited to the use for installing anchor bolts, and can be applied to a wide range of uses related to the installation of various bolts 2.

1 Bolt support unit 2 Anchor bolt (bolt)
2a Male thread 3 Formwork 4 Support plate 4a Insertion hole 5 Stopper 10 Sleeve 20 Main body 21 Through hole 22 Upper wall (one end wall)
23 Lower wall (other end wall)
24, 25 Side wall 30 1st notch 40 Female thread 50 2nd notch 60 Fixed arm 61 Tip 70 3rd notch 80 Support

Claims (12)

Bolts with male threads and
With a stopper fixed to the bolt
The stopper includes a main body having a through hole extending in the axial direction of the bolt, a first notch portion in which the side wall of the main body forming the through hole is cut out in the axial direction, and an inner circumference of the through hole. It has a sleeve with a female thread formed on the surface and
The bolt is inserted into the main body from the first notch in a posture in which the main body is tilted with respect to the axial direction, and then the main body is tilted in a direction along the axial direction with respect to the male screw portion. A bolt support unit in which the female threaded portion is engaged with the male threaded portion from an intersecting direction intersecting the screwing direction, and the sleeve is supported by the bolt by maintaining the engaged state. The bolt support unit according to claim 1, wherein the female thread portion has the same thread pitch as the male thread portion. The bolt support unit according to claim 2, wherein the female thread portion is formed at a position facing the first notch portion in the radial direction of the bolt. A support plate having an insertion hole through which the bolt is inserted is further provided.
The bolt support unit according to claim 3, wherein the sleeve is supported by the support plate while the bolt is inserted into the insertion hole while maintaining the engaged state. The sleeve has a second notch that cuts the side wall of the main body in the radial direction of the bolt.
The bolt support unit according to claim 4, wherein the support plate is located in the second notch. The sleeve has a pair of fixing arms extending apart from the main body with an opening of the first notch in the radial direction.
The pair of fixing arms each have a tip portion that is bent in the axial direction toward the second notch portion.
While maintaining the engaged state, the bolt is inserted into the insertion hole, and by tilting the main body in a direction along the axial direction, the support plate located in the second notch is formed with the respective support plates. The bolt support unit according to claim 5, wherein the sleeve is supported by the support plate by locking the tip end portion. The sleeve is a third notch in which the side wall of the main body forming the through hole is cut out from a direction different from that of the first notch in the axial direction at a position facing the first notch in the radial direction. The bolt support unit according to claim 6, which has a portion. The bolt support unit according to claim 7, wherein the female thread portion is formed at a position facing the opening of the third notch portion in the radial direction. The bolt support unit according to claim 8, wherein the pair of fixing arms extend in the radial direction from one end wall of the main body. The sleeve has a support portion that protrudes in the axial direction from the other end wall of the main body.
The bolt support unit according to claim 9, wherein the support portion is brought into contact with the bolt from the radial direction in the engaged state. The bolt is an anchor bolt supported between a pair of formwork of the foundation.
The bolt support unit according to any one of claims 4 to 10, wherein the support plate is bridged and fixed to the pair of formwork. A stopper comprising the sleeve according to any one of claims 1 to 11.

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