JPS5850852B2 - Method of manufacturing concrete formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that a reinforcing steel plate is inserted into the frame on the back side, and recesses 11 are formed in the end frame portions 2 located at both ends of the frame on the back side over the entire length of the inner surface. A panel 1 having the following properties is extrusion-molded using a thermoplastic low-foaming synthetic resin, cut to a desired length, and a recess 12 is formed along the entire length of the inner surface at the cut edge of the panel 1 for longitudinal joint use. This relates to a method of manufacturing a concrete formwork characterized by attaching a concrete formwork, and its purpose is to form a concrete formwork that has high strength against concrete pouring pressure, can be nailed, and can be connected reliably vertically and horizontally. A method for manufacturing concrete formwork is provided.

The present invention will be explained in detail below with reference to Examples.

First, a reinforcing steel plate 4 is insert-molded, and a panel 1 having recesses 11 along the entire length of the inner surface in the end frame portions at both ends of the back surface is extrusion-molded using a thermoplastic low-foam synthetic resin.

Low foam molding has an expansion ratio of about 1.5 to 2.0 times that of thermoplastic resins such as polyethylene, polypropylene, ABS, etc., and when nailed, it can be driven and has the ability to hold the nail, for example. When attaching the formwork for the ventilation hole to the panel 1, it can be securely attached by nailing.

In the illustrated embodiment, the frame portion 5 protrudes from the back surface of the panel 1.
The reinforcing steel plate 4 is inserted in the frame part 5, but the reinforcing steel plate 4 may also be inserted in other parts, but in any case, the reinforcing steel plate 4 must be inserted in the frame part 5. That's how it is.

Next, this panel 1 is cut at right angles to the extrusion direction to obtain a desired height.

In the figure, reference numeral 6 denotes a panel connecting hardware, which has a U-shaped cross section, and is bent inward leaving a part of the edge of the back piece 7 to form a horizontal piece 8, and the remaining part. A screw hole 9 is drilled in the hole.

In the figure, numeral 10 is a core for vertically joining panels, and a recess 12 is provided along the entire length.

Here, insert the panel vertical joint core 10 into the panel connection hardware 6, and with the horizontal piece 8 locked to the stepped part 16 of the panel vertical joint core 10, the front surface of the panel vertical joint core 10 and the panel Insert the cut end of the panel 1 between the front pieces 17 of the connecting hardware 6, and insert screws through the fixing screw holes 18 drilled in the front piece 17 to connect the panel connecting hardware 6 and the panel 1 to the panel vertically. The child 10 is fixed, and a screw is further inserted through the screw hole 9 to secure it to the frame 5 of the panel 1.

In this way, the panel vertical joint cores 10 are attached to the upper and lower edges of the panels 1 via the panel connecting hardware 6, thereby forming the concrete formwork A.

Therefore, in the concrete form A obtained according to the present invention, the frame portions 5 located at both the left and right ends and the panel longitudinal joint cores 10 attached to the panel connecting hardware 6 located at both the upper and lower ends form the end frame portion 2 on the outer periphery. The recess 11 of the end frame portion 2 and the recess 12 of the panel vertical joint core 10 each form a groove 3.

Here, when connecting the concrete formworks A laterally, the end frame part 2 of the concrete formwork A adjacent to the left end frame part 5 constituting the end frame part 2 of the concrete formwork A is connected. The frame portion 5 on the right side of the panel connector 19 is inserted and locked into the groove 3, and the U of the panel connector 19 is abutted.
The end frame portions 2 are held together by the U-shaped portion 21 by rotating the U-shaped portion 21.

In this case, the locking shaft portion 20 can be freely locked anywhere in the groove 3, and is not restricted by the unevenness of the footing.

In addition, when connecting the concrete formworks A vertically, the grooves 3 of the panel longitudinal joint cores 10 constituting the end frame portions 2 of the concrete formworks A are used to connect the concrete formworks A with panel connectors 19. It is something to do.

Next, when it is desired to obtain a concrete form A with a large left and right width, it is connected using a connecting hardware 13 as shown in FIG.

The connecting hardware 13 is constructed by placing an L-shaped piece 15 facing inward at the opening of a U-shaped portion 14.

However, when it is desired to obtain a concrete formwork A with a large left and right width, when assembling and forming the concrete formwork A, the panels 1 are placed side by side on the left and right, and the connecting hardware 13 is placed over the adjacent frame portions 5. By fitting the L-shaped pieces 15 into the recesses 11 of the frame portion 5 and locking them, the panels 1 can be connected to each other to obtain a concrete form A with a large width.

In this case, the panel connecting metal fittings 6 are used to connect the lower edges of the panels 10 that are connected in the lateral direction, using ones having the same length as the left and right widths of the concrete form A that is desired to be formed.

In the figure, numeral 22 denotes a formwork for the protruding corner, which is formed by extrusion molding of a low-foaming synthetic resin with a low expansion ratio of 1.5 to 2.0 times, and has an abbreviated shape. A vertical groove 24 is provided along the entire length on the inner side of the right-angled side pieces 23, and the end frame portion 2 of the concrete formwork A is provided on the outer surface of the both side pieces 23, respectively.
The U-shaped part 21 is rotated by locking the locking shaft part 20 of the panel connector 19 using the groove 3 of the end frame part 2 or the vertical groove 24 of the projecting corner form 22. The end frame part 2 and the side piece 23 are connected in a pinched manner, and the concrete forms A are connected at right angles to form an outgoing corner.

Reference numeral 25 in the figure denotes a corner frame, which is formed by extrusion molding of a low foaming synthetic resin with a low expansion ratio of 1.5 to 2.0 times, and is formed inwardly at both ends of the L-shaped piece 260. Extending the refracting piece 27,
A vertical groove 28 is provided on the inner surface of the refracting piece 27 over the entire length, and the outer cross section of the refracting piece 27 is applied to the end frame 2 of the concrete formwork A, and the groove 3 of the end frame 2 is applied. The locking shaft 20 of the connecting member 19 is locked using the vertical groove 28, and the U-shaped portion 21 is rotated to sandwich the end frame portion 2 and the bending piece 27,
Concrete forms A are connected at right angles to form an inside corner.

Here, a reinforcing metal material may be inserted into the external corner form 22 and the internal corner form 25 as necessary.

In the figure, 29 is an abbreviated gap adjusting body, and one concrete formwork A is connected to the panel connector 19, and the other concrete formwork A is slid against one piece of the gap adjusting body 29. The concrete forms A can be freely contacted to adjust the gap between them.

In the figure, 31 is a support fitting for supporting the concrete formwork A when the concrete formwork A is erected.

In the present invention, as described above, a panel with a reinforcing steel plate inserted into the frame on the back side is extruded with thermoplastic low-foaming synthetic resin, and this is cut to an arbitrary length.
Not only does it have the advantage of being able to freely select the height of the concrete formwork, but it also has the advantage of being reinforced with reinforcing steel plates and having high strength against the concrete pouring pressure.For this reason, synthetic resin is used to withstand the concrete pouring pressure. It is lightweight and easy to handle because it does not need to be thick, and since it is made of low-foam synthetic resin, it has the advantage of being able to be nailed and has strong nail support. Since a recess is provided in the end frame portion of the concrete panel over the entire length of the inner surface, it is possible to use the recess to connect concrete panels to each other with a panel connector, and when connecting, it is possible to connect the concrete panels over the entire length. It has the advantage that the connector can be locked in any part of the recess provided, and concrete formwork can be easily connected to each other regardless of the unevenness of the footing. Since a panel vertical joint core with a recessed part extending over the entire length of the inner surface is attached to the cut edge of the panel, not only can the panel vertical joint core provide reinforcement, but it can also be used when stacking concrete forms one above the other. However, there is an advantage that the upper and lower concrete forms can be connected by a connector using the recessed part, and that they can be stacked in multiple stages.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the state of use of the concrete form obtained by the present invention, FIG. 2 is a partially cutaway rear view of one embodiment of the concrete form obtained by the present invention, and FIG. b, c, d are partially cutaway side views of Fig. 2, Fig. 2
A sectional view taken along the X-ray, a sectional view taken along the Y-Y line, and a sectional view taken along the Z-2 line.
Diagram a. b, c, d, and e are the front view, rear view, and side view of Fig. 4, the cross-sectional view taken along line X-X in Fig. 4, the cross-sectional view taken along line Y-Y in Fig. 5, and Fig. 6 a, b, c is a top view, front view, and side view of the core for panel longitudinal joints used in the same as above, FIG. 7 is a perspective view of the connecting hardware used in the same as above, and FIG. 8a is. b is a top view and a side view of the panel connector used in the same as above, FIG.
Figure 0 is a partially cutaway perspective view of the large corner formwork used in the above.
1A and 1B are cross-sectional views of each embodiment of the same panel as above, where 1 is a panel, 2 is an end frame portion, 4 is a reinforcing steel plate, 10 is a core for vertically connecting the panel, and 11 is a recess. , 12 is a recess.

Claims (1)

[Claims] 1 A reinforcing steel plate is insert-molded into the frame on the back, and a panel with recesses extending the entire length of the inner surface on the end frames located on both sides of the frame on the back is made of thermoplastic low-foam synthetic resin. A method for producing a concrete formwork, which comprises extruding it, cutting it to a desired length, and attaching a core for longitudinally joining the panel having a concave portion along the entire length of the inner surface of the cut edge of the panel.