JPH0640777Y2 - Face plate for concrete foundation frame - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a faceboard for a concrete formwork used for constructing a concrete foundation for civil engineering and construction.

[Prior Art] When constructing a concrete foundation in the field of civil engineering and construction, it may be necessary to make a shape (chamfer) in which a corner portion of the concrete foundation surface (upper surface) is cut out.
Therefore, when it is necessary to chamfer such a concrete foundation, the concrete foundation shape is regulated by attaching a face wood having, for example, a triangular cross-section inside the upper edge of the formwork.

[Problems to be Solved by the Invention] However, as a conventional means for attaching such a face plate to a formwork, since the formwork is conventionally made of wood, a wooden form preformed at a predetermined position of the wooden concrete foundation frame is used. The face plate is fixed by manual nailing.
For this reason, it is difficult to keep the height of each face plate constant when a large number of formworks are arranged due to the variation in the attachment position of the face plate or the unevenness of the formwork installation surface. There has been a problem that it takes a lot of time and labor to completely match the joints of the face boards. As a solution to this problem, the inventors of the present invention have proposed No. Kaikai 2-115844. This is shown in Figs.
It is configured as shown in the figure. That is, 1 is a form, which is made of metal such as steel or is a steel frame attached to a wooden frame, and this shape is generally rectangular. Reference numeral 2 denotes a surface main body that is attached to the surface of the mold 1, that is, the upper edge of the surface on which concrete is poured. The surface main body 2 is formed into a substantially trapezoidal cross section, and the material is wood or resin material. Etc. are used. As shown in FIG. 4, a magnet 3 is embedded in the face plate main body 2 as a means for fixing and attaching the face plate body 2 to the form 1, and the face plate body 2 is attracted by the magnet 3. Two
Can be attached to the form 1 by suction. To attach the magnet 3 to the main body 2, as shown in FIG.
A dovetail groove or a T-groove 7 is formed in the longitudinal direction of the face plate main body 2, and a mounting yoke 4 provided with a pair of engagement pieces 8 at both ends of the substrate 5 is provided in the groove 7. Groove 7 with groove 8
The yoke 3 is attached by fitting the magnet 3 to the substrate 5 of the yoke 4. As a means for forming the engaging piece 8 on the substrate 5 of the mounting yoke 4, it is integrally formed by bending at the time of molding the mounting yoke 4, and the step of mounting the engaging piece 8 by post-processing can be omitted, which is economical. Can be increased. Such an engaging piece 8 of the mounting yoke 4
Is fitted into the dovetail groove 7 or the T-groove of the face plate main body 2 to attach the magnet 3 to the face plate main body 2 via the attachment yoke 4, and along the longitudinal groove of the face plate body 2. The position of the magnet 3 can be easily adjusted. The magnet 3 was magnetized in the O direction (shown in FIG. 6), and 6 was a bent piece for reducing the magnetic circuit reluctance, which was made the same length as the magnet length in accordance with the usual practice of magnetic circuit design. However, in such a case, it is unavoidable that a gap 9 is generated between the bending piece 6 and the magnet 3, and this gap 9 is formed in the mold 1
Since it faces and is exposed, it is not possible to make a wide interval in order to restrict the entry of sand iron bent nails and the like, and it is difficult to adopt a gap filling means from the economical viewpoint. In addition, since the thickness of the face plate main body 2 is defined, a thick magnet having a large magnetomotive force for generating a magnetic flux flowing over the wide gap 9 is used as the face plate main body 2.
There is also the problem of not being within. (The required suction force opposes the buoyancy of the face plate body 2 and is related to the height, that is, the concrete burial depth, regardless of the thickness. This causes this problem.) As a result,
The gap 9 must be a small gap, but if this is done, a magnetic circuit short circuit will occur due to the leakage magnetic flux (short circuit) 10 as shown in FIG. 6, and the magnetic flux will not reach the form 1; As shown in FIG. 7, the portion 11 of the magnet 3 near the bending piece 6 becomes an ineffective portion that does not contribute to the attraction force.
That is, the portion of the magnet 3 which supplies the effective magnetic flux 20 is reduced to the portion 12 shown in FIG. 7 (see FIG. 7), the attraction force of the magnet 3 to the mold 1 is reduced, and the face plate main body is reduced. 2 had a drawback that it easily dropped from the concrete foundation frame 1.

[Means for Solving the Problems] The present invention has been made in view of such conventional problems, and a magnet having a length equal to the length of the base plate of the mounting yoke is provided in the mounting yoke. To provide a base plate for a concrete foundation frame which allows both ends of the magnet to protrude from the bent piece, thereby avoiding a magnetic circuit short circuit at both ends of the magnet, and thereby firmly adhering to the concrete foundation frame. With the goal.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2.

In this embodiment, most of the configuration is similar to that of the conventional one shown in FIG. 3 and subsequent figures, and therefore, the same components will be assigned the same reference numerals and explanations thereof will be omitted. Then, mainly different points will be described.

A magnet 3 having a length substantially equal to the length thereof is provided on the substrate 5 so that both ends thereof protrude from the length of the bent piece 6.
(When the magnet 3 is a ferrite magnet, it is most preferable when the length of the magnet 3 is longer than the substrate 5 by several mm.) As the magnet 3 for this attraction, a ferrite magnet is generally applied. The magnetic flux density at the operating point is about 1.5KG, which is an order of magnitude smaller than the saturation magnetic flux density of the steel plate yoke. Therefore, even if the length of the magnet 3 projects longer than the length of the bent piece 6, the magnetic flux from the projecting portion is (second
As shown in the figure, the flow is concentrated around the bending piece 6 (through a mold (not shown)). As a result, a magnetic circuit effective for attraction can be formed even by combining the long magnet 3 and the short bent piece 6. In addition, the magnetic flux from the protruding portion of the magnet 3 is concentrated on both ends of the bending piece 6 in the longitudinal direction, so that the saturation magnetic flux density is reached, and the magnetic flux from the magnet 3 in a portion within the length of the bending piece 6 is also reached. , It is driven to focus on the central part of the bent piece 6, so that the ineffective portion 11 'is reduced as shown.
As a result, both the magnetic circuit function and the effective area of the magnet 3 are increased to generate a strong attraction force.

Further, on the back surface of the magnet 3, in the conventional example shown in FIG. 7, the end portion 13 of the substrate 5 exists only as a support portion of the engaging piece 8 and does not contribute to the magnetic circuit function at all. Although there is a problem that a leakage magnetic flux is generated at the end portion, in the case of this example, it also has a function of effectively guiding and dispersing the magnetic flux returning from the bent piece 6 to the protruding portion of the magnet 3.

[Advantages of the Invention] As described above, the present invention is a concrete foundation frame base plate in which at least the opposing inner surface is a concrete base frame made of iron. T-grooves or dovetail grooves 7 are provided on the mounting surface of the face plate main body 2 to be attached to the form frame 1 so as to extend along the longitudinal direction thereof. The mounting yoke 4 is formed by bending the two sides of the substrate 5 located between the two engaging pieces 8 by bending the engaging pieces 8 at substantially right angles to each other.
The mounting yoke 4 is movably mounted by engaging the engaging piece 8 with the dovetail groove 7 so as not to come out, and the magnet 3 having a length substantially equal to that of the substrate 5 is attached to the mounting yoke 4 at both ends thereof. Since it is a concrete base frame frame which is provided so that the portion protrudes from the bent piece 6, and the frame body 2 is attracted to the mold 1 by the magnet 3, The magnetic flux of the protruding portion of the magnet protruding from both ends of the bending piece 6 effectively passes directly through the mold,
In addition, as a result of increasing the magnet effective portion, there is an excellent effect that the face plate main body is securely attached to the concrete foundation frame, and the substrate surface required for attachment can be effectively contributed to the magnetic circuit function.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view showing an essential part of the above embodiment, FIG. 3 is a perspective view of a conventional concrete foundation frame, and FIG. FIG. 5 is a perspective view showing the main part of the above, and FIGS. 5 to 7 are explanatory views of the same. DESCRIPTION OF SYMBOLS 1 ... Concrete foundation frame 2 ... Face plate main body, 3 ... Magnet 4 ... Mounting yoke, 5 ... Substrate 6 ... Bend piece, 7 ... Dovetail groove 8 ... Engagement piece

Claims (1)

[Scope of utility model registration request] 1. A formwork baseboard having a base (2) adsorbed and attached to a formwork (1) having at least opposing inner surfaces made of an iron concrete foundation frame by a magnet (3), said baseboard. A T-groove or a dovetail groove 7 is provided in the longitudinal direction of the mounting surface of the main body 2 with respect to the form 1, and both ends of both ends of the substrate (5) made of a magnetically permeable material are tilted and bent backward to engage. A mounting yoke (4) is provided by providing a piece (8) and bending both side portions of the substrate (5) located between the engagement pieces (8) forward at a substantially right angle to provide a bending piece (6). Make
The mounting yoke (4) is movably mounted by engaging the engaging piece (8) with the dovetail groove (7) so that the mounting yoke (4) does not come out. Magnets (3) having substantially the same length are provided such that both ends of the magnets (3) protrude from the bent pieces (6), and the face plate main body (2) is moved by the magnets (3) to the form (1).
A baseboard for a concrete foundation frame characterized by being adsorbed on.