JP4097550B2 - Formwork and separator connector - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a connector that is used by being attached to a formwork in order to connect the concrete formwork and a separator.
[0002]
[Prior art]
This type of connector is mainly used when a separator has to be installed after placing the concrete into the concrete placement space formed by the mold, A connector main body is attached to the position via a connecting screw shaft to the mold, and after the bar arrangement, the end (head) of the separator is engaged with the connector main body. As described in Patent Document 1, this type of conventional connector is used in a situation where a heat insulating material is stretched inside the mold, and the connector main body is made of a metal plate. In the case where the constructed reinforced concrete structure is used in a state in which the concrete is exposed, it cannot be used in a state where the connector main body is in direct contact with the inside of the mold. Because, when the end face of the metal connector body is exposed at the time of formwork dismantling, it causes rusting of the connector body, and eventually leads to rusting of metal members such as internal separators and reinforcing bars, It is necessary to interpose between the coupler body and the mold to remove the mortar filling space when the mold is dismantled so that the metal coupler body is not exposed to the concrete surface in the exposed state, It was necessary to remove the cone after the formwork was dismantled and to fill the mortar with the removal trace. Of course, there is also known a connector made by molding the connector body with plastic and inserting a metal nut into which the connecting screw shaft to the mold is screwed. There is also a problem that the connection strength with the separator is lowered as the height increases.
[0003]
[Patent Document 1]
Japanese Patent No. 3083129 [0004]
[Means for Solving the Problems]
The object of the present invention is to provide a connecting tool for a mold and a separator that can solve the conventional problems as described above, and means for attaching the same will be described with reference numerals in the embodiments described later. As shown, it is composed of a combination of a metal main body 1 and a plastic cap 3, and the main body 1 is provided on the other end side with a connecting screw shaft 2 projecting from one end side thereof. The separator 3 is provided, and the cap 3 is externally fitted to the end of the main body 1 on the side where the screw shaft 2 for connecting to the mold is projected. It is a connecting tool of a mold and a separator comprising a mold contact end face plate part 20 that covers the outer surface of the part, and a peripheral wall part 21 provided with a retaining action surface 21a for the cast concrete , the body 1 Is a rectangular tube that penetrates in the vertical direction, and the cap 3 is Rectangular protruding plate portions 25a and 25b are integrally projected from both upper and lower sides of the rear wall portion 6 to be fitted, and the cap 3 is provided with leading end edges 27 of the pair of upper and lower protruding plate portions 25a and 25b. The inner side surfaces 22a and 22b that are in close contact with each other are formed .
[0006]
When carrying out the present invention having the above-described configuration, a rectangular shape is formed by raising and lowering the left and right side walls 8a and 8b connected to the left and right sides of the rear wall 6 from the left and right sides of the rear wall 6 of the main body 1 . Protruding plate portions 26a and 26b are integrally projected, and the cap 3 has four parallel inner surfaces 22a to 23b which are in close contact with the respective leading edges 27 of the pair of upper and lower and left and right protruding plate portions 25a to 26b. Can be formed.
[0007]
Further, the main body 1 is formed with a burring hole 19 projecting inwardly in the rear wall portion 6 on the side where the cap 3 is fitted, and the connecting shaft 2 to the mold is connected to the inner end screw. The shaft portion 8 can be attached to the main body 1 by being screwed into the burring hole 19 of the main body 1 through the central through hole 24 of the cap 3.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 to 4, 1 is a rectangular cylindrical body penetrating in the vertical direction, 2 is a screw shaft for connecting to a mold, and 3 is a body. 1 is a plastic cap externally fitted to 1. The main body 1 is provided with a separator connecting portion 5 on the front wall portion 4 and a bolt attaching portion 7 to which the connecting screw shaft 2 is attached on a rear wall portion 6.
[0009]
The screw shaft 2 for connecting to the mold frame is composed of a short inner end screw shaft portion 8 on the main body 1 side, a long outer end screw shaft portion 9 on the mold frame side, and a shaft portion 10 between both screw shaft portions. It has a breaking groove 11 formed at a position adjacent to the end screw shaft portion 8.
[0010]
The main body 1 is configured by bending a single band-shaped metal plate (such as an iron plate) so that the front wall portion 4 is formed by both end portions 13a and 13b overlapping each other. Thus, the separator connecting portion 5 provided on the front wall portion 4 is composed of a separator fitting concave portion 14 formed by notching downward from the upper side of the front wall portion 4 and a separator retaining portion 15. Yes. The separator fitting recess 14 is composed of two notch recesses 16a and 16b formed to overlap each other on both ends 13a and 13b of the belt-like body forming the front wall portion 4, as shown in FIG. On the inner side of one notch recess 16a, a protrusion 17 constituting the retaining action portion 15 is formed at an intermediate height position, and the other side opposite to the inner side above the protrusion 17 is formed. The inner side of the notch recessed portion 16b forms upwardly extending inclined guide surfaces 18a, 18b for pushing the both ends 13a, 13b against elasticity by pushing the separator.
[0011]
The bolt mounting portion 7 of the main body 1 is constituted by a burring hole 19 formed so as to protrude inward at the center position of the rear wall portion 6 of the main body 1. The burring hole 19 is formed with a thread groove into which the inner end screw shaft portion 8 of the connecting screw shaft 2 is screwed.
[0012]
The plastic cap 3 is composed of a formwork contact end face plate 20 and a peripheral wall part 21 provided with a retaining action surface 21a against the cast concrete. The retaining action surface 21a It is formed of a truncated conical surface (having a small diameter on the side of the mold contact end face plate portion 20) formed on the peripheral wall portion 21 in a region approximately half the axial length from the end face plate portion 20. In addition, on the inner side of the peripheral wall portion 21, a pair of upper and lower pairs that match four sides of a square (center coincides with the axis of the cap 3) with each corner portion cut into an arc shape and parallel to the axis of the cap 3. Inner side surfaces 22a and 22b parallel to each other and a pair of inner side surfaces 23a and 23b parallel to each other are formed. It should be noted that the thickness of the peripheral wall portion 21 excluding the retaining action surface (truncated conical surface) 21a is similar to the inner peripheral surface including the inner side surfaces 22a to 23b so as to be substantially equal over the entire circumference. Molding. A through hole 24 having a diameter slightly larger than the inner diameter of the burring hole 19 of the main body 1 is provided concentrically at the center of the mold contact end face plate portion 20.
[0013]
On the other hand, rectangular projecting plate portions 25a, 25b and 26a, 26b are integrally projected from the four sides of the rear wall portion 6 to the rectangular tubular main body 1, respectively. More specifically, on both the upper and lower sides of the rear wall portion 6, rectangular projecting plate portions 25 a and 25 b having a smaller width than the width are integrally projected. The pair of left and right rectangular projecting plate portions 26a and 26b, which are narrower than the projecting plate portions 25a and 25b, are cut and raised from the left and right side wall portions 8a and 8b connected to the left and right sides of the rear wall portion 6. Projected as a single unit. These four protruding plate portions 25 a to 26 b are configured such that the respective leading edges 27 coincide with tangents on a virtual circle concentric with the burring hole 19, and are formed on the four inner side surfaces 22 a to 23 b of the cap 3. It can adhere.
[0014]
Therefore, the cap 3 is fitted to the rear wall 6 side of the main body 1 in the axial direction so that the four inner side surfaces 22a to 23b and the four protruding plate portions 25a to 26b on the main body 1 side are aligned. By pushing in, the cap 3 can be externally integrated with the main body 1 so that the mold contact end plate 20 of the cap 3 and the rear wall portion 6 of the main body 1 are in contact with each other. In this state, the end edges 27 of the projecting plate portions 25a to 26b on the main body 1 side are in close contact with the inner side surfaces 22a to 23b of the cap 3, and the cap 3 is caused by friction between the two. It is held and does not easily come off the main body 1. Of course, in order to make the integration of the main body 1 and the cap 3 stronger, it is possible to use an adhesive in combination between them.
[0015]
In actual use, the connecting screw shaft 2 and the inner end screw shaft portion 8 are screwed into the burring hole 19 of the main body 1 from the central through hole 24 of the cap 3, whereby the rear wall portion 6 of the main body 1. Install it on the side. Thus, the method of using the connector having the above-described structure will be described with reference to an example of the connection of one end of the separator to the mold placed on one side of the concrete placement space. As shown in FIG. A through-hole 29 having a diameter that allows the connecting screw shaft 2 to be inserted into the mold frame is just inserted in accordance with the installation position. The connecting screw shaft 2 is inserted into the through-hole 29 from the inside of the mold frame 28, thereby An appropriate mold fastening hardware 30 is screwed and fastened to the outer end screw shaft portion 9 of the bolt 2 outside 28. The mold contact end face plate 20 of the cap 3 is pressed against the mold 28 by the tightening force of the mold fastening hardware 30 at this time. It should be noted when attaching the main body 1 to the formwork 28 that the main body 1 is oriented so that the inclined guide surfaces 18a and 18b of the separator fitting recess 14 in the separator connecting portion 5 of the main body 1 spread upward. It is.
[0016]
When the bar arrangement work in the concrete placement space inside the formwork 28 is completed, as shown in phantom lines in FIGS. 3 and 4, the nut 31 is screwed into the one end screw shaft portion 31 a of the separator 31. The separator shaft 31b adjacent to the head 32 is fitted into the separator connecting portion 5 of the main body 1 so that the head 32 (the head may be integrally formed with the separator) is inserted into the main body 1. Push into the recess 14 downward from above. Thus, the separator shaft portion 31b has a retaining action portion while expanding both end portions 13a, 13b of the main body constituting band-like body outwardly against the elasticity via the inclined guide surfaces 18a, 18b of the separator fitting recess 14. It passes through the position of 15 (protrusion 17) downward and is housed and supported at the bottom of the lower end of the separator fitting recess 14 (see FIG. 4). At this time, both end portions 13a and 13b of the main body constituting belt-like body are elastically restored to their original positions, and the retaining action portion 15 (projection portion 17) covers the upper side of the separator shaft portion 31b, and the separator 31 is pulled upward. To prevent.
[0017]
When the casting of concrete into the concrete casting space formed inside the mold 28 and the curing period have passed, and the mold 28 is dismantled and removed, the mold of the cap 3 is flush with the concrete surface. The contact end face plate portion 20 is exposed. Thus, the connecting screw shaft 2 protruding from the central through hole 24 of the cap 3 is removed by screwing back, and the inner end portion is inserted into the burring hole 19 of the main body 1 at the central through hole 24 of the cap 3. The exposed concrete surface can be finished by internally fitting and fixing a small plastic filling cap or by filling an appropriate resin filler. Further, the connecting screw shaft 2 can be broken by the breaking groove 11. In this case, a plastic small cap for stuffing whose inner end portion is fitted in the burring hole 19 of the main body 1 cannot be used, but a small cap that fits only in the central through hole 24 of the cap 3 or a suitable cap can be used. The central through hole 24 of the cap 3 can be closed with a resin-based filler or the like.
[0018]
In addition, the specific structure of the separator connection part 5 is not limited to the thing of the said embodiment. Also, the method of attaching the connecting screw shaft 2 to the main body 1 to the formwork is not limited to the above embodiment. Furthermore, as the rectangular projecting plate portion used for the integration of the cap 3 and the main body 1, rectangular projecting plate portions 25a to 26b are integrally projected from the four sides of the rear wall portion 6, The cap 3 only needs to be fitted on the rear wall 6 side of the main body 1, and means for integrating both may be provided as necessary. Therefore, even when the rectangular projecting plate portions 25a to 26b are used as described above, the pair of left and right projecting plate portions 26a and 26b or the pair of upper and lower projecting plates formed by cutting and raising from the left and right side wall portions 8a and 8b. Either one of the parts 25a and 25b can be omitted.
[0019]
【The invention's effect】
The present invention can be implemented and used as described above, and according to the connecting device of the mold and separator of the present invention, since it is a metal body, it is made of plastic with a nut inserted. Compared with the case of manufacturing the main body, it can be manufactured at low cost even in small-volume production, and the connection strength with the separator in the separator connection portion can be sufficiently increased. In addition, a plastic cap is fitted on the end of the main body from which the connecting screw shaft to the mold is projected, and the mold contact end plate of the cap is in contact with the inner surface of the mold. By attaching the main body to the mold, the mold contact end face plate surface of the plastic cap is exposed flush with the cast concrete surface when removing the mold. Therefore, by removing the connecting screw shaft protruding from the cap by an appropriate method, the center through hole of the cap is simply closed with a plastic filling cap or an appropriate filler, and the like. Rusting of the metal main body to be buried can be prevented.
[0020]
In other words, by using the connector of the present invention, when the cast concrete is finished in a state where it is finished without having to interpose a mortar filling space forming cone between the metal main body and the mold, it is buried. It is easy to prevent rusting of the metal main body. Of course, it is possible to prevent the plastic cap whose surface is exposed to the cast concrete surface from accidentally coming off by the retaining action surface for the cast concrete provided in the peripheral wall portion of the cap.
[0021]
Furthermore , according to the structure of this invention , each front-end edge of a pair of upper and lower protrusion board parts which can project easily the plastic cap externally fitted with respect to the metal main body from the upper and lower sides of the rear wall part of the said main body. The cap can be easily integrated with the main body by close contact with the inner surface of the cap, and the cap can be removed from the main body during handling before use without using any special coupling means (such as adhesive). Can be prevented. In particular, according to the configuration of the second aspect , the effect of integrating the main body and the cap can be further enhanced.
[0022]
Further, according to the configuration of the third aspect , it is possible to easily remove the connecting screw shaft after removing the mold form disassembly, and after the removal, the burring hole in the main body is used to open the opening (through hole in the cap). ) Can be easily blocked.
[Brief description of the drawings]
FIG. 1A is a longitudinal side view of a main body with a cap and a side view of a connecting screw shaft, and FIG. 1B is an exploded perspective view of the main body with a cap.
FIG. 2 is a partial cross-sectional plan view of the assembled connector.
FIG. 3 is a front view of a connector.
FIG. 4 is a longitudinal side view for explaining a method of use.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Square tube-shaped main body 2 Screw shaft 3 for connection to a formwork 4 Plastic cap 4 Main body front wall part 5 Separator connection part 6 Main body rear wall part 7 Bolt attachment part 8 Inner end screw shaft part 9 of a connection screw shaft Outer end screw shaft portion 10 of connecting screw shaft Shaft portion 11 of connecting screw shaft Folding recess groove 14 of connecting screw shaft Separator fitting recess 15 Separator retaining action portions 16a, 16b Two notch recessed portions 17 Projection Part (separator retaining action part)
18a, 18b Upper inclined guide surface 19 Burring hole 20 Cap form contact end plate portion 21 Cap peripheral wall portions 22a-23b Cap inner surface 24 Cap central through holes 25a-26b Projecting plate portion 28 of main body Formwork 30 Formwork fastening hardware 31 Separator 32 Separator head

Claims (3)

It consists of a combination of a metal main body and a plastic cap, and the main body is provided with a screw shaft for connection to a mold projecting from one end side thereof, and a separator connecting portion provided on the other end side. The cap is externally fitted to the end of the main body on the side on which the connecting screw shaft to the formwork protrudes, and covers the outer surface of the end of the main body. And a separator made up of a peripheral wall portion having a retaining surface against the cast-in concrete and a separator, wherein the main body has a rectangular tube shape penetrating in the vertical direction, and the cap is outside. A rectangular projecting plate portion is integrally projected from both upper and lower sides of the rear wall portion to be fitted, and the cap has inner side surfaces parallel to each other in close contact with the respective leading edges of the pair of upper and lower projecting plate portions. A connecting tool for a mold and a separator formed . From the left and right sides of the rear wall portion of the main body, a rectangular projecting plate portion is integrally projected by cutting up and down the left and right side wall portions connected to the left and right sides of the rear wall portion. The coupling tool of a mold and a separator according to claim 1, wherein four parallel inner surfaces are formed in close contact with the respective leading edges of the pair of upper and lower protruding plate portions. The main body has a burring hole projecting inwardly in a rear wall portion on the side where the cap is fitted, and the inner end screw shaft portion of the screw shaft for connection to the mold is penetrated through the center of the cap. The tool for connecting a mold and a separator according to claim 1 or 2 , wherein the coupler is threaded into the burring hole of the main body through the hole .

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