JP2013023878A - Concrete formwork connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete formwork connector which connects wooden batten cleats 11 arranged at the periphery of a concrete formwork to each other or connects the wooden batten cleat 11 and a synthetic resin batten cleat 13 into an adjacent form without using nails and is suitable for integral molding from synthetic resin.SOLUTION: A concrete formwork connector having a U-shape which connects batten cleats 11, 13 arranged at the periphery of concrete formworks 12, 14/12A, 12B into an adjacent form includes a connection part 2 and a pair of holding piece parts 3a and 3b which are consecutively arranged in the same direction from both ends of the connection part 2. The inner side of the connection part 2 is provided with at least one protrusion 6 to form a recess part 7 which is concaved to the top faces of the batten cleats 11, 13. When the protrusion 6 comes in contact with the top face of the batten cleat 11, the recess part 7 forms a tool insertion space S between the top faces 11, 13 and the connection part 2.

Description

  The present invention relates to a concrete formwork connector for joining piers arranged at the periphery of a concrete formwork in an adjacent state without using nails.

  As a conventional concrete formwork connector of this type, as described in Patent Document 1, a metal fitting made of a metal plate is known. This metal plate made of metal is a metal plate with an appropriate thickness cut out in a U-shape, and has a connection part and a pair of sandwiching pieces connected in the same direction from both ends thereof. Thus, the connecting portion is provided with a tool insertion hole for inserting a bar or a nail punch when the connecting hardware is removed from the mold.

Utility Model Registration No. 3160202

  In the conventional connector as described in the above-mentioned Patent Document 1, when this connector is fitted so as to straddle two adjacent piers and the two piers are coupled to each other, the connection abuts against the upper surface of the pier Since the tool insertion hole in the part is far away from the upper surface of the pier, the efficiency of transmitting force to the hardware is poor when removing the hardware by removing a bar or a nail, and the removal work is not easy.

  The present invention proposes a concrete formwork coupler that can solve the conventional problems as described above, and the concrete formwork joint according to the present invention according to claim 1 will be described later. In order to facilitate understanding of the relationship with the embodiment, the reference numerals used in the description of the embodiment are shown in parentheses, and arranged on the periphery of the concrete formwork (12, 14 / 12A, 12B). A U-shaped concrete formwork linking tool that connects the piers (11, 13) adjacent to each other, and a connecting part (2) and a pair of sandwiching pieces (3a) connected in the same direction from both ends thereof , 3b) and at least one protrusion (6) forming a recessed portion (7) recessed into the upper surface of the crosspiece (11, 13) on the inner side of the connecting portion (2) When the protrusion (6) abuts on the upper surface of the crosspiece (11), the recessed portion (7) is connected to the upper face of the crosspiece (11, 13) and the connecting portion (2 ) To form a tool insertion space (S).

  When carrying out the present invention, specifically, as described in claim 2, the protrusion (6) is biased to one side from the center position between the pair of sandwiching pieces (3a, 3b). The tool insertion space (S) can be formed on one side of the protrusion (6), and the protrusion ( 6a, 6b) are provided in two symmetrical positions with respect to the central position between the pair of sandwiching pieces (3a, 3b), and the tool insertion space (S) is provided in the two protruding portions (6a, 6b). It can be configured to be formed in the middle.

  According to the concrete formwork connector of the present invention as set forth in claim 1 above, when two parallel adjacent piers are joined by this connector, the linking portion of the linking tool is connected to the upper surface of the pier at the protruding portion. Therefore, a tool insertion space is automatically formed between the upper surface of the pier and the connecting portion by the recessed portion of the connecting portion adjacent to the projecting portion. Therefore, when removing the connector with a bar or nail remover, insert the bar or nail remover operation end into the tool insertion space, and when removing the connector from the pier due to a repulsive action, By causing the portion to act on the inner surface of the recessed portion facing the upper surface of the pier, the operating force applied to the bar and the nail puller can be efficiently applied in the direction of removing the connecting tool, and the connecting tool can be easily removed. Further, since it is possible to suppress a decrease in strength of the connecting tool as compared with the case where a tool insertion hole is formed in the connecting tool as in the prior art, it is particularly effective when the connecting tool is molded from a synthetic resin. is there.

  In addition, there is a concrete formwork in which a crosspiece is formed of a synthetic resin. The special concrete formwork equipped with this synthetic resin pier is much thinner than the general-purpose concrete formwork using wooden piers. When trying to connect with the connector according to the present invention, it is difficult to dimensionally form a space for inserting a tool adjacent to the protruding portion, but a synthetic concrete pier and a general-purpose concrete mold of a special concrete formwork In the case of connecting the wooden pier of the frame, according to the configuration of claim 2, the width is such that the width of the recessed portion between one protruding portion and the holding piece portion on one side can be used as a tool insertion space. Therefore, it can be used as a connecting tool for connecting a synthetic resin pier of a special concrete formwork and a wooden pier of a general-purpose concrete formwork.

  Moreover, according to the structure of Claim 3, when connecting the wooden piers of a general-purpose concrete formwork, the tool insertion space which can form in the center position between both clamping piece parts can be formed easily. Can be used as

FIG. 1 is a diagram showing a first embodiment, FIG. 1A is a longitudinal front view showing a state immediately before hammering, FIG. 1B is a longitudinal front view showing a state when hammering is completed, and FIG. 1C is a longitudinal side view of FIG. 1B. FIG. 2 is a longitudinal front view showing a state immediately before driving with a hammer of the connector in the second embodiment. FIG. 3 is a longitudinal front view showing a state when the hammering of the coupler in the second embodiment is completed. FIG. 4 is a front view of the connector in the third embodiment. 5A is an enlarged sectional view taken along line XX of FIG. 4, and FIG. 5B is an enlarged sectional view taken along line YY of FIG. FIG. 6 is a bottom view of the coupler in the third embodiment.

  In FIG. 1, reference numeral 1 denotes a connecting tool integrally formed of synthetic resin, which includes a connecting portion 2 and a pair of sandwiching piece portions 3 a and 3 b that are connected from both ends of the connecting portion 2 to the same side. ing. On the inner side surfaces of the pair of sandwiching piece portions 3a and 3b, temporary sandwiching surface portions 4a and 4b formed substantially parallel to each other in a region of a certain length from the tip of the sandwiching piece portions 3a and 3b, and the temporary sandwiching surface portion 4a. 4b, press contact portions 5a, 5b projecting in a circular arc shape are formed on the inner side of the temporary clamping surface portions 4a, 4b at positions adjacent to the side where the connecting portion 2 is present. Further, on the inner side surface of the connecting portion 2, one projecting portion 6 is formed at a position close to one clamping piece portion 3 a with respect to the longitudinal center position of the connecting portion 2. One recessed portion 7 is formed between the holding piece portion 3b.

  The corners 8a and 8b between the connecting portion 2 and the pair of sandwiching pieces 3a and 3b have arc centers at substantially the same positions as the arc centers of the outer arc-shaped projecting corners 9a and 9b. It has an arc shape with a large radius. The outer surface 2a of the connecting portion 2 is formed into a large radius arcuate curved surface connecting the arc-shaped protruding corner portions 9a, 9b at both ends without a step, and the outer surface of the pair of sandwiching piece portions 3a, 3b. Is formed on a straight flat surface (which may be an arc-shaped protruding curved surface having the largest radius) that connects the arc-shaped protruding corner portions 9a and 9b and the tip without any step.

  The connector 1 having the above-described configuration is a special-purpose concrete formwork 12 in which a wooden pier 11 is disposed around a formwork board 10 and a synthetic resin pier 13 having a thin plate thickness is provided around the formwork board 10. In order to connect and integrate the concrete formwork 14, the concrete piers 13 and 14 are sandwiched and fastened between the wooden pier 11 and the synthetic resin pier 13 adjacent to each other in parallel. Thus, the distance between the temporary clamping surface portions 4a and 4b of the pair of clamping pieces 3a and 3b of the connector 1 is determined by the thickness of the wooden pier 11 adjacent to each other of the two concrete molds 12 and 14 and the synthetic resin. It is configured to be equal to or slightly narrower than the overall thickness of the pier 13. Of course, the distance D between the temporary clamping surface portions 4a and 4b may be slightly larger than the total thickness of the two piers 11 and 13 adjacent in parallel due to the manufacturing accuracy of the concrete molds 12 and 14.

  Accordingly, when the concrete molds 12 and 14 are connected and integrated with each other by the connector 1, as shown in FIG. 1A, two piers adjacent to each other in parallel at the temporary holding surface portions 4a and 4b of the pair of holding pieces 3a and 3b. The connector 1 is fitted to the two piers 11 and 13 so as to sandwich the 11 and 13 therebetween. As a result, the connecting tool 1 is caused by the frictional force between the inner surfaces of the two adjacent piers 11 and 13 and the temporary clamping surface portions 4a and 4b, so that the two adjacent piers 11 and 13 is held in a driving posture parallel to 13. Of course, as described above, a necessary frictional force is generated between the inner side surfaces of the two adjacent piers 11 and 13 and the temporary clamping surface portions 4a and 4b due to a manufacturing error of the concrete molds 12 and 14 or the like. However, the connecting tool 1 may fall in the length direction of the piers 11 and 13, but even in this case, the connecting tool 1 is raised by hand and driven perpendicular to the length direction of the piers 11 and 13. What is necessary is just to hold in a posture.

  In any case, when the connecting tool 1 is driven with a hammer, the driving operation is performed in a state in which the connecting tool 1 is held by a hand and held in a driving posture perpendicular to the longitudinal direction of the piers 11 and 13. Is desirable. While the two clamping pieces 3a and 3b are deformed to open against the elasticity by driving operation with a hammer, the press contact parts 5a and 5b ride on the inner surfaces of the two adjacent piers 11 and 13 in parallel. Finally, when the protruding portion 6 in the connecting portion 2 comes into contact with the upper surface of the wooden pier 11 on one side, the driving operation of the connecting tool 1 is completed as shown in FIG. 1B. It should be noted that the protruding portion 6 is desirably positioned so as to contact the upper surface of the wide wooden pier 11 even when the protruding portion 6 is used in the direction in which the protruding portion 6 is positioned on the synthetic resin pier 13 side. When the projection 6 is used in a direction positioned on the synthetic resin pier 13 side, the projection 6 is configured to contact the upper surface of the synthetic resin pier 13 or the upper surfaces of both piers 11 and 13. May be.

  As a result of the hammering operation, the two adjacent piers 11 and 13 of the adjacent concrete molds 12 and 14 are brought into contact with the elastic restoring force of the pair of sandwiching pieces 3a and 3b of the connector 1 respectively. Received from the parts 5a and 5b and clamped to each other. At this time, as shown in FIGS. 1B and 1C, a tool insertion space S that is in contact with the upper surface of the wooden pier 11 is provided between the recessed portion 7 provided in the connecting portion 2 of the connector 1 and the wooden pier 11. Therefore, when removing the connector 1 at the time of disassembling the formwork, the tip 15a of the tool 15 such as a burl or a nail extractor is inserted into the tool insertion space S, and the tool 15 causes An operating force in the detaching direction can be applied from the distal end portion 15 a to the inner surface of the recessed portion 7 in the connecting portion 2 of the connecting device 1, so that the connecting device 1 can be extracted from the crosspieces 11 and 13.

  As shown in FIGS. 2 and 3, the connecting tool 1 for connecting the general-purpose concrete molds 12A and 12B provided with the wooden pier 11 is provided with an interval between the holding pieces 3a and 3b as shown in the drawing. Is wider (the length of the connecting portion 2 is longer), so that on the inner surface of the connecting portion 2, the two protruding portions 6a and 6b are made to approach the sandwiching piece portions 3a and 3b, respectively, and are formed symmetrically, One recessed portion 7 can be formed between the projecting portions 6a and 6b. In this case, the projecting portions 6a and 6b abut against the upper surfaces of the wooden piers 11 of the two concrete molds 12A and 12B adjacent to each other, and the tool insertion space S is formed across the upper surfaces of the two wooden piers 11. Will be.

  When implementing the connector 1 shown in FIG. 1 or the connector 1 shown in FIGS. 2 and 3, as shown in FIGS. 4 to 6, of the U-shaped side surfaces 1 a and 1 b on both sides of the connector 1, On one side of the U-shaped side surface 1a, cylindrical protrusions 16a and 16b are projected at positions inside the pressure contact portions 5a and 5b of the sandwiching pieces 3a and 3b, and on the opposite side of the U-shaped side surface 1b, It is possible to provide two recesses 17a and 17b into which the protrusions 16a and 16b are respectively fitted when the connecting devices 1 having the same structure are stacked. When the connector 1 having the above-described configuration is integrally formed of synthetic resin, a large number of material-reducing recesses 18 are formed at the center of the thickness of the connector 1 on the U-shaped side surfaces 1a and 1b on both sides of the connector 1. In this case, a large material-reducing concave portion formed in a region extending from the position inside the press-contact portions 5a and 5b of the sandwiching pieces 3a and 3b to the tip is formed. 18a and 18b, the protrusions 16a and 16b are integrally formed from the bottom surface of the material reducing recess 18a on one side, and the material side recess 18b on the opposite side is fitted into the material reducing recess 18b. A plurality of circumferential projections 20 for positioning the projections 16a and 16b in the other connecting tool 1 to be jammed can be projected by integral molding.

  According to the configuration shown in FIGS. 4 to 6, when stacking a plurality of coupling tools 1, two adjacent ones above and below are stacked by stacking so that the protrusions 16 a and 16 b of each coupling tool 1 protrude in the same direction. The connecting tool 1 can be fitted to each other at the protrusions 16a and 16b and the recesses 17a and 17b to prevent a side slip. At this time, if an appropriate frictional force is applied between the protrusions 16a and 16b and the recesses 17a and 17b that are fitted to each other, the coupling devices 1 can be held in a stacked state by the frictional force. .

  Furthermore, the connector 1 can be configured such that when a plurality of connectors 1 are stacked in the same direction, a through hole is provided at a position communicating with each other, and a string can be bundled through the through hole. However, when the configuration shown in FIGS. 4 to 6 is adopted, as shown in the drawing, a string-through through-hole that opens concentrically with the protrusions 16a and 16b and opens into the recesses 17a and 17b on the opposite side. 21 can be provided.

  When the temporary clamping surface portions 4a and 4b are formed on the inner side surfaces of the both clamping piece portions 3a and 3b, the both clamping piece portions 3a and 3b are passed from the tips of the temporary clamping surface portions 4a and 4b through a right angle or an acute angle. In order to facilitate the relative fitting operation of two adjacent parallel piers between the temporary clamping surface portions 4a and 4b, it is natural that it is not necessary to form the outer side surfaces of the two. An introduction portion composed of a slope inclined outward or an arc surface extending outward can be formed at the tips of the temporary clamping surface portions 4a and 4b.

  The concrete formwork connector of the present invention is a concrete formwork connection suitable for integrally molding with a synthetic resin that joins piers arranged at the periphery of a concrete formwork in an adjacent state without using nails. Can be used as a tool.

DESCRIPTION OF SYMBOLS 1 Connection tool 2 Connection part 3a, 3b Clamping piece part 4a, 4b Temporary clamping surface part 5a, 5b Pressure contact part 6, 6a, 6b Protrusion part 7 Recessed part 8a, 8b Corner part 9a, 9b Outer corner part 10 Formwork board 11 Wooden piers 12, 12A, 12B, 14 Concrete mold 13 Synthetic resin pier 15 Tool 15a Tool tip 16a, 16b Protrusion 17a, 17b Concavity 18, 18a, 18b Material reduction concavity 19 Partition 20 Protrusion 21 For stringing Through hole S Tool insertion space

Claims (3)

  A U-shaped concrete formwork linking tool for connecting piers arranged on the periphery of a concrete formwork in an adjacent state, and comprising a joint part and a pair of sandwiching piece parts connected in the same direction from both ends thereof Provided, the inner side of the connecting portion is provided with at least one projecting portion that forms a recessed portion that is recessed with respect to the upper surface of the pier, and when the projecting portion abuts on the upper surface of the pier, A concrete formwork connector, wherein the recessed portion is configured to form a tool insertion space between the upper surface of the pier and the connecting portion.   The projecting portion is provided only at one location deviated to one side from the center position between the pair of sandwiching piece portions, and the tool insertion space is configured to be formed on one side of the projecting portion. The concrete formwork connector according to claim 1.   The protrusions are provided at two symmetrical positions with respect to a central position between the pair of sandwiching pieces, and the tool insertion space is formed between the protrusions. Item 2. The concrete formwork connector according to Item 1.

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