JP2008106507A - Anchor bolt holding fixture for concrete form - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchor bolt holding fixture for a concrete form, which can erect and hold a plurality of anchor bolts in the concrete form, along a longitudinal direction of the concrete form at accurate intervals. <P>SOLUTION: The anchor bolt holding fixture is formed of a holding plate 6 which is laid astride both upper edges 2a, 4a of the form 1 such that both edges thereof are laterally constricted, and has a through hole 8 bored at the center thereof, the through hole having a diameter larger than that of the anchor bolt 10; and a pair of nuts 12, 14 which are screwed onto the anchor bolt 10 inserted into the through hole 8 bored in the holding plate 6, for pinching the same from upper and lower surfaces. The nut 14 for fastening the upper surface of the holding plate 6 has a circular boss formed on a fastening surface thereof, for fitting into the through hole 8. The boss has a diameter smaller than that of an inscribed circle of the nut 14 and a height from the fastening surface, equal to or smaller than a plate thickness of the holding plate 6, and a tip corner portion of the boss is chamfered. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement of an anchor bolt holding jig for concrete formwork.

  Conventionally, as an anchor bolt holding jig 301 for concrete molds for standing and holding anchor bolts at predetermined intervals in a concrete mold used for placing concrete when constructing a concrete foundation, FIG. 5 and FIG. As shown in FIG. 2, the holding plate 304 having the insertion portion 304A of the anchor bolt 302 at the center and both ends being placed on the top ends of the left and right concrete molds 303, and the anchor bolt inserted into the insertion portion 304A 302 and a pair of nuts 305 that sandwich the holding plate 304 from above and below, and at both ends of the holding plate 304 in the left-right direction near the left and right top ends 303A of the mold 303 Is provided with a positioning member 306 that can be engaged (see, for example, Patent Document 1).

  FIG. 5 is a cross-sectional view of a concrete formwork showing a conventional concrete mold interval holding jig, and shows an installation state of an anchor bolt holding jig, and FIG. 6 shows an installation state of a conventional anchor bolt holding jig. It is a top view of a concrete formwork.

  The holding plate 304 shown in FIGS. 5 and 6 is composed of a rectangular iron plate whose both ends are bent downward, and the insertion portion 304A of the holding plate 304 is a circular hole having a diameter slightly larger than the diameter of the anchor bolt 302. The holding plate 304 is formed with two small holes 304B that can be nailed to the left and right top ends 303A at both ends of the holding plate 304, and the bent portions 306A and both ends of the holding plate 304 at both ends are formed. A groove is formed by an angle member 306B welded to the lower surface in the vicinity.

  The concrete form anchor bolt holding jig 301 configured in this way is installed before placing concrete. In this installation operation, the lower nut 305 is screwed from the upper end of the anchor bolt 302 to fix it. By inserting the upper nut 305 from the upper end side of the anchor bolt 302 that protrudes from the lower surface side of the holding plate 304 into the insertion portion 304A and protrudes from the upper surface side of the holding plate 304 and tightens it, the upper and lower sides of the holding plate 304 are arranged. The holding plate 304 is clamped by the pair of nuts 305 from above and below.

  Subsequently, both ends of the holding plate 4 to which the anchor bolts 302 are mounted are placed on the top and the bottom of the mold 303, and the vicinity of the top and bottom of the mold 303 is sandwiched between the grooves on the both ends of the holding plate 304. The holding plate 304 is temporarily fixed to the mold 303 in the vertical direction by nailing to the top end 303A of the mold 303 through the small holes 304B at both ends of the 304.

  Therefore, concrete A is placed in the left and right molds 303 on which the anchor bolt holding jig 301 is installed, and is cured for a predetermined time, whereby a concrete foundation in which the anchor bolts 302 are planted is constructed. After that, the nut 305 positioned above the holding plate 304 is removed from the anchor bolt 302, and the last remaining lower nut 305 is removed from the anchor bolt 302, whereby the foundation construction is completed.

JP 2000-104263 A

  By the way, in the concrete form anchor bolt holding jig 301 as described above, the insertion portion 304A of the holding plate 304 is configured as a circular hole having a diameter slightly larger than the diameter of the anchor bolt 302. As shown in FIG. 6, the anchor bolt 302 has play due to the diameter difference of the insertion portion 304 </ b> A when it is arranged at regular intervals in the longitudinal direction of the concrete mold 303 while being held by the holding plate 304. Accumulated errors occur in the longitudinal direction at regular intervals X1, X2, X3,.

  For this reason, if an error occurs in the interval between the anchor bolts 302 arranged in a plurality of rows, the interval between the mounting holes of the anchor bolts 302 that are manufactured in the factory in advance does not match the interval between the anchor bolts 302, so a large repair work is unavoidable. As a result, the construction work period is not only significantly delayed but also the construction cost is increased.

  The present invention has been made paying attention to such problems, and a concrete mold anchor bolt capable of standing and holding a plurality of anchor bolts in a concrete mold frame at a precise interval in the longitudinal direction. An object is to provide a holding jig.

In order to solve the above-mentioned object, a concrete mold anchor bolt holding jig J according to claim 1 of the present invention includes a plurality of anchor bolts 10 at predetermined intervals in a mold 1 in which concrete C is placed. In an anchor bolt holding jig J for a concrete formwork that stands upright and holds, the anchor bolt is stretched and held between the upper end portions 2a and 4a of the formwork 1 in a state where both ends thereof are regulated in the width direction. And a pair of nuts 12 that are screwed into anchor bolts 10 inserted through the insertion holes 8 of the holding plate 6 and sandwich the upper and lower surfaces of the holding plate 6. , 14, and at least a nut 14 for tightening the upper surface of the holding plate 6 is provided with a circular boss 16 that fits into the insertion hole 8, and the boss 16 has a diameter thereof. Is the nut 14 For concrete molds characterized in that the diameter is smaller than the diameter of the inscribed circle, the height from the clamping surface is formed within the thickness of the holding plate 6, and the chamfer 18 is applied to the corner of the tip. An anchor bolt holding jig.
According to the concrete mold anchor bolt holding jig J described above, when the plurality of anchor bolts 10 are erected and held in the mold 1, the anchor bolts 10 into which the nuts 12 are screwed in advance are placed below the holding plate 6. An anchor bolt 10 that protrudes from the upper part of the holding plate 6 by inserting the large-diameter insertion hole 8 therethrough and holding both ends of the holding plate 6 across the upper ends 2 a and 4 a of the mold 1 to regulate the width direction. The nut 14 is screwed from the upper end of the nut 14 so that the circular boss 16 of the nut 14 is fitted into the large-diameter insertion hole 8 of the holding plate 6, and in this state, the upper and lower surfaces of the holding plate 6 are placed on the pair of nuts 12, The anchor bolt 10 is erected and held in the mold 1 by being sandwiched by 14.

  The present invention has the following effects.

  According to the first aspect of the present invention, in a state in which the boss of the nut screwed into the anchor bolt protruding through the large-diameter insertion hole from the lower surface of the holding plate is fitted into the large-diameter insertion hole. By holding both ends of the holding plate straddling the upper end of the formwork and sandwiching the upper and lower surfaces of the holding plate with the pair of nuts, a plurality of anchor bolts are set up in the concrete formwork at an accurate interval along the longitudinal direction. Can be held.

  Examples of the present invention will be described below.

  1 to 4 show an embodiment of the present invention. FIG. 1 is a perspective view showing a state in which an anchor bolt is erected and held in a concrete form using the anchor bolt holding jig for concrete form according to the present invention, and FIG. 2 is an anchor for concrete form according to the present invention. FIG. 3 is a sectional view showing a state in which an anchor bolt is erected and held in a concrete mold using a bolt holding jig. FIG. 3 is an enlarged sectional view of a main part of an anchor bolt holding jig for a concrete mold according to the present invention. 4 is a perspective view of a nut constituting a part of the anchor bolt holding jig for concrete formwork according to the present invention.

  In FIG. 1, 1 is a concrete formwork, and this concrete formwork (hereinafter referred to as formwork 1) is held in a standing state on a base concrete BC using a spacing holder described later.

  The mold 1 is composed of a welded structure using a bent steel plate, and is composed of an inner frame 2 and an outer frame 4 arranged to face each other at a predetermined interval. The inner frame 2 and the outer frame 4 is individually held in a standing state on the base concrete BC using the interval holder 5, and is connected to a predetermined length via the connecting portion T.

  In FIG. 2, the inner frame 2 and the outer frame 4 are erected and held in a state of being spaced apart from each other by a distance holder 5 formed in a strip shape with a thin steel plate, and inside the inner frame 2 and the outer frame 4. The anchor bolt 10 is erected and held at predetermined intervals along a longitudinal direction using a concrete form anchor bolt holding jig (hereinafter referred to as an anchor bolt holding jig J) according to the present invention which will be described later. It is like that.

  The anchor bolt holding jig J is stretched and held between the top end surfaces 2a and 4a, which are the upper end portions of the mold 1, in a state where both ends are regulated in the width direction, and is larger than the diameter of the anchor bolt 10 in the center portion. A holding plate 6 having a diameter insertion hole 8 and a pair of nuts 12 and 14 which are screwed into anchor bolts 10 inserted into the insertion holes 8 of the holding plate 6 and sandwich the upper and lower surfaces of the holding plate 6. Has been.

  On the top end surfaces 2a and 4a of the inner frame 2 and the outer frame 4, a holding plate 6 formed by bending a thin steel plate in a U-shape is stretched and held, and temporarily fixed by a holding tool (clamper or the like) not shown. It has come to be. The holding plate 6 has a pair of locking portions 6a and 6b that are locked to both outer ends of the top end surfaces 2a and 4a of the inner frame 2 and the outer frame 4 at both ends formed in a band plate shape and bent. An insertion hole 8 having a diameter larger than the diameter of the anchor bolt 10 is formed in the center portion.

  The anchor bolt 10 inserted through the large-diameter insertion hole 8 of the holding plate 6 straddled and held on the top end surfaces 2a and 4a of the inner frame 2 and the outer frame 4 has a pair of nuts 12 and 14 into which the bolts are screwed. Through the holding plate 6.

  Specifically, as shown in FIGS. 3 and 4, a circular boss 16 that fits into the insertion hole 8 protrudes from the tightening surface of the nut 14 that tightens the upper surface of the holding plate 6. The diameter of the boss 16 is smaller than the diameter of the inscribed circle of the nut 14, and the height from the tightening surface of the nut 14 is within the thickness of the holding plate 6. The part is chamfered 18.

  Therefore, when the anchor bolt 10 is erected in the mold 1, a large-diameter insertion hole 8 is formed from below the holding plate 6 in a state where a nut 12 positioned in advance is screwed from the upper end of the anchor bolt 10. Is inserted and protruded upward, and both ends of the holding plate 6 are held between the top end surfaces 2a and 4a of the inner frame 2 and the outer frame 4 to restrict movement in the width direction. .

  Next, the next nut 14 is screwed from the upper end of the anchor bolt 10 protruding above the holding plate 6, and the circular boss 16 of the nut 14 is fitted into the large-diameter insertion hole 8 of the holding plate 6. The anchor bolt 10 is erected and held inside the mold 1 by sandwiching the upper and lower surfaces of the holding plate 6 with the nut 14 and the nut 12 screwed first.

  In this way, the plurality of anchor bolts 10 can be accurately erected and held at regular intervals drawn in the mold 1 from the reference point. The boss 16 of the anchor bolt 10 has an outer diameter that is substantially the same as the inner diameter of the large-diameter insertion hole 8 of the holding plate 6, but a chamfer 18 is applied to the tip corner of the boss 16. Therefore, it can be smoothly inserted into the large-diameter insertion hole 8.

  Next, when the anchor bolts 10 are erected and held in the mold frame 1 at regular intervals, the concrete C is placed in the mold frame 1 and after curing for a predetermined time, the plurality of anchor bolts 2 are spaced at regular intervals. A concrete foundation that is erected and held accurately is constructed.

  Thus, by using the anchor bolt holding jig for concrete formwork, a plurality of anchor bolts 2 can be erected and held in the formwork 1 along the longitudinal direction at an accurate interval. The period can be shortened and the construction cost can be reduced.

  After the concrete foundation is constructed, the nut 14 on the holding plate 6 is removed from the anchor bolt 2, and then all the holding plates 6 are removed from the anchor bolt 2. When removing the holding plate 6 from the anchor bolt 2, the insertion hole 8 is formed with a diameter sufficiently larger than the diameter of the anchor bolt 10, so that the holding plate 6 can be easily extracted from the anchor bolt 10. The removal of the remaining nut 12 from the anchor bolt 10 completes the construction of the concrete foundation in which the plurality of anchor bolts 2 are erected and held at an accurate interval.

It is a perspective view which shows the state which used the anchor bolt holding jig for concrete molds which concerns on this invention, and stood and hold | maintained the anchor bolt in the concrete mold. It is sectional drawing which shows the state which used the anchor bolt holding jig for concrete forms which concerns on this invention, and stood and hold | maintained the anchor bolt in the concrete formwork. It is a principal part expanded sectional view of the anchor bolt holding jig for concrete molds concerning this invention. It is a perspective view of the nut which constitutes a part of anchor bolt holding jig for concrete formwork concerning the present invention. FIG. 10 is a cross-sectional view of a concrete formwork, showing a conventional concrete formwork spacing holding jig and showing an installation state of an anchor bolt holding jig. It is a top view of the concrete formwork which shows the installation state of the conventional anchor bolt holding jig.

Explanation of symbols

1 Concrete formwork (formwork)
2 Inner frame 2a, 4a Top end surface 4 Outer frame 6 Holding plate 6a, 6b Locking portion 8 Insertion hole 10 Anchor bolt 12, 14 Nut 16 Boss 18 Chamfered BC Base concrete C Concrete J Anchor bolt holding jig

Claims (1)

In a concrete form anchor bolt holding jig J for holding a plurality of anchor bolts 10 upright at predetermined intervals in a form 1 in which concrete C is placed,
A holding plate 6 straddlingly held in a state where both ends are regulated in the width direction between the upper end portions 2a, 4a of the mold 1 and having a through hole 8 having a diameter larger than the diameter of the anchor bolt 10 in the center portion; It is composed of a pair of nuts 12 and 14 which are screwed into anchor bolts 10 inserted into the insertion holes 8 of the holding plate 6 and sandwich the upper and lower surfaces of the holding plate 6.
A circular boss 16 that fits into the insertion hole 8 protrudes from at least a fastening surface of the nut 14 that fastens the upper surface of the holding plate 6, and the diameter of the boss 16 is an inscribed circle of the nut 14. The anchor bolt holding jig for concrete formwork, characterized in that the diameter is smaller than the diameter and the height from the tightening surface is formed within the thickness of the holding plate 6 and a chamfer 18 is applied to the corner of the tip. Ingredients.

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