JPH0138201Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a holder that maintains the distance between left and right formwork when assembling metal concrete formwork.

(b) Prior art Conventionally, as a spacing retainer for metal concrete formwork, both ends of a board were bent upward, a U-shaped cut was made on the inside of the board across the thickness of the formwork, and the cut portion was The one bent upwards is from 1974.
This is already known from Publication No. 10735.

(c) Problems that the invention aims to solve Generally, when concrete is poured between the formwork on both sides, the formwork receives a force that pushes it out to both sides.

At that time, since the known spacing holder simply bends both ends of the flat plate upward along a line perpendicular to the length direction, the outer rising part receives a pressing force in the thickness direction, and It has the disadvantage that it bends easily, and in order to compensate for this defect, the overall thickness of the plate has to be increased, which increases the cost and makes it difficult to transport because a large number of them are used at one site.

Furthermore, when assembling the formwork, a so-called steel plate is placed at the bottom of the excavated trench, but the surface is leveled by the operator's touch, so height differences inevitably occur.

However, the length of the formwork is usually over 1.8m, and according to the strength of the known spacing devices, it is necessary to use four spacing devices within the length of one set of formworks, and these spacing devices are When inserting one concrete form between the bent parts on one side, it is possible to insert it to a specified depth for those in high places, but for those in low places. Only a portion of the material can be inserted, and if concrete is poured in this state, the outside bent part of the part that is only partially inserted will be pushed outward by the pressing force of the concrete and the concrete formwork will be bent. Sometimes it came off.

Also, when setting the other concrete formwork on the other side of the spacing holder, the concrete formwork will touch the ground at high places, but at low places, the bent portions will only slightly fit into the formwork, and the spacing holder will It is difficult to insert the mold into the bent part of the mold, and the bent part at the outer end is pushed out, causing the concrete form to come off.

(d) Means for solving the problem The present invention consists of making two pairs of plate-like protrusions on the sides of the strip plate with a gap slightly narrower than the width of the formwork, and making cuts in the width direction to make them longer. By bending along a horizontal line, a raised protrusion is provided, and the load during concrete pouring is received in the width direction of the plate-like protrusion, thereby preventing the plate-like body from being pushed and bent. By forming a notch into which the lower side edge of the formwork fits inside the base of the plate-like protrusion, and by curving upward between at least one pair of plate-like protrusions, the lower part of the concrete formwork is is locked in the notch to prevent the plate-like protrusion from coming off the concrete formwork, and when setting the concrete formwork, even if there is a difference in height on the surface of the concrete formwork, the curved part side of the spacing aid is fixed in advance. When pushed into the lower part of one of the concrete formworks, the curved part is firmly clamped by the elasticity that tries to restore it, and when it is placed on the steel plate in this state, the other end of the spacing part in the lower part is in an upright position, and with the other concrete formwork tilted outward, its lower outer edge is placed near the notch on the other side of the spacing retainer, and the lower outer edge of the formwork is tilted outward. The above-mentioned problem has been solved by making it possible to easily set it in a predetermined position by simply standing it up after engaging each notch.

(E) Function When setting the spacing retainer to the concrete formwork, before placing the concrete formwork on the concrete formwork,
When the concrete formwork is placed in an upright state or laid down on its side, and the outer plate-shaped protrusion notch on the side of the curved part is engaged with the lower outer edge of the concrete formwork and then pushed in, the curved part becomes elastic. The inner plate-shaped protrusions engage with each other.

In this state, when the spacer is grounded on the concrete formwork, the concrete formwork stands up due to the holding action of the spacer, and the spacer that is not grounded is held by the concrete formwork.

Next, when the other concrete form is raised by holding the other concrete form and engaging its lower outer edge with the notch of the plate-like protrusion on the other outer edge, the lower part of the formwork engages with the plate-like protrusion on that side. It fits between the two halves. In this state, the upper part of the formwork is fixed with an appropriate spacing holder.

When concrete flows between the left and right formwork, the formwork is pushed outward, but the plate-like protrusion at the outer end of the spacing retainer receives the pressing force at the notch in its base, so that the formwork is pushed outward. The moment exerted on the plate-shaped protrusion is negligibly small and opposes in the plate width direction, so the plate-shaped protrusion does not bend.

Also, the spacer is only subjected to a substantial tensile force.

When the poured concrete has hardened, remove the upper spacing holder, hold the top of the formwork and tilt it outward.The lower outer edge of the formwork will easily come off the notch, making it easy to remove. be able to.

(f) Example An example of the present invention will be explained with reference to the drawings.
Horizontal grooves 2a, 2a having slopes on the central side are formed in the middle part of the strip iron plate 1 at a distance between the forms, and horizontal grooves 2a, 2a having slopes on the central side are provided, and from that part outwards, there are provided an interval b, which is approximately equal to the lower width of the formworks 3, 3. There is an L-shaped horizontal groove 2 in the part separated by b.
Further, lateral grooves 2c, 2c are provided at parts spaced apart from the lateral grooves 2a, 2a by intervals c, c, respectively. By bending the portions in between upward along lines d parallel to the length direction of the strip iron plate 1, plate-shaped protrusions A, B, C, whose plate surfaces are parallel to the length direction of the strip iron plate 1 are formed. D can be obtained, and notches 4, 4 are formed on the inside of the base of the outer plate-like protrusions A, D, and the interval b between the plate-like protrusions B, C near the center, and the oblique upper part on the b side. Edges 5,5 are formed.

Further, the space between the plate-like projections A and B on one side is curved upward to form a rounded portion 6.

When assembling the formworks 3, 3, the formworks 3 are transported to an assembly location by a roller conveyor, etc., and the formwork 3 is placed on the roller conveyor or placed in an upright position, and the rounded portion of the spacer holder is When the notch 4 of the plate-shaped protruding piece A on the 6 side is engaged with the outer edge of the formwork 3, and the beveled edge 5 of the plate-like protruding piece B is pressed against the inner edge of the formwork 3, the rounded part 6 is The plate-shaped projecting pieces A and B elastically clamp the lower part of the formwork 3 from both sides and are held in that state.

When placed in a predetermined position on the steel plate in this state, the formwork will stand up with the support of the spacer.

Next, when the other formwork 3 is tilted outward and its outer edge is engaged with the notch 4 of the protrusion D from between the plate-like protrusions C and D and raised, the formwork 3
The other side edge is guided by the beveled edge 5 and fitted up to the base.

When assembling the other formwork 3 mentioned above, the spacing holder at the bottom of the steel plate is not grounded, but it is elastically supported by one formwork 3, so the other end is at a predetermined height. The side edge of the formwork 3 can be easily engaged with the notch 4 and can be fitted between the plate-like protrusions C and D.

After the lower portions of the left and right formworks 3, 3 are connected with a plurality of spacing holders in this manner, the upper portions are fixed with appropriate spacing holders and concrete is poured.

At this time, the lower portions of the left and right formworks 3, 3 are pushed outward, but since their outer edges are engaged with the notches 4, 4, the moment loaded on the plate-like protrusions A, D is This is practically negligible, and the plate-like protrusions A and D support the pressing force of the formworks 3 and 3 in the plate width direction, and the spacing retainer only receives the tensile force, so the thin iron plate But you can definitely accept it.

Once the concrete has hardened, remove the upper spacing holder and pull the upper part of the formwork 3 outward, the lower inner edge will come off the plate-like protrusion B or C, and in that state, the formwork 3 It can be removed by lifting.

Also, the horizontal grooves 2c, 2c are omitted and the horizontal grooves 2c, 2c are omitted.
The same effect can be obtained even if the entire space between a and 2a is made to stand up as shown by the chain line in FIG.

(g) Effects of the invention Since the invention is constructed as described above, when the plate-shaped protrusions A and B on the curved side of the spacer are fitted to the lower part of one formwork 3, the outer edges of It engages with the notch 4 of the outer plate-like protrusion A, and the plate-like protrusion A,
B will elastically hold the lower part of the formwork 3, and when the formwork 3 is placed on a steel plate with a height difference in this state, the spacing holder at the part corresponding to the lower part will be at a predetermined height. Therefore, when another formwork 3 is fitted to the other end side of the plurality of spacer retainers, the other end of each spacer retainer is at approximately a predetermined height, and the lower outer edge of the formwork is can be easily engaged with the notch 4 of the plate-shaped protrusion D, and can be fitted between the pair of plate-shaped protrusions C and D.

Also, when concrete is poured between the assembled formworks 3, 3, the lower outer edges of the formworks 3, 3 are engaged with the notches 4, 4 at both ends of the spacer, so the formworks 3, 3 The relative positions of the plate-like protrusions A and D of the spacer holder do not change, and the plate-like protrusions A and D are pushed outward by the formworks 3 and 3 in the width direction of the plates. It reliably prevents it from coming off.

Furthermore, the outward pressing force of the forms 3, 3 acts as a tensile force on the spacer, so that even a thin iron plate can provide sufficient strength.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Figure 1 is a plan view of the horizontal grooves formed on the steel plate formed on the spacer, Figure 2 is a front view of the spacer, Figure 3 is a perspective view of the same as above, and Figure 4 is a cross section of the assembled formwork. It is a diagram. 1 is a band-shaped iron plate, 2a, 2b, 2c are horizontal grooves, 3 is a formwork, 4 is a notch, and A, B, C, and D are plate-shaped protrusions.

Claims (1)

[Scope of utility model registration request] Two pairs of plate-like protrusions A, B, C, and D are placed on the sides of the strip plate with a gap slightly narrower than the width of the formwork 3, and are cut in the width direction so as to extend along the length of the strip plate. They are made to stand up by being bent along a line, and cutouts 4, 4 into which the lower side edges of the formwork 3 fit are formed inside the bases of the plate-like projections A, D at the outer ends, forming at least one pair. A concrete form spacing holder characterized in that the space between the plate-like protrusions A and B is curved upward.