JPS6318655Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reinforcing member retention device for use with two or more elongated reinforcing members embedded in a casting material. The invention is particularly, but not exclusively, applicable to cast concrete with embedded reinforcing elements.

In cast reinforced concrete technology, there has heretofore been difficulty in keeping reinforcing members spaced from the surfaces forming the plastic concrete that is being cast and/or hardened.

For example, when pouring into a floor, workers typically step into the plastic concrete, reach the main part, remove the reinforcing members from the bottom, and physically pull them up.

Another problem has been maintaining the reinforcing members in the desired physical relationship to each other while the concrete is poured in place.

One object of the present invention is to provide a new and inexpensive reinforcing member retainer that overcomes the above-mentioned problems associated with the prior art.

Another object of the invention is to provide a device for retaining one reinforcing member to another during casting, and for retaining these reinforcing members to a surface such as the wall, floor or bed of the mold in which casting is carried out. There is a particular thing.

Yet another object of the invention is to maintain the spacing of one reinforcing member to the other and both reinforcing members to surfaces such as walls, floors or beds of the mold into which the casting is being performed during plastic concrete pouring. An object of the present invention is to provide a reinforcing member holding device that maintains the reinforcing member.

According to the invention, while a casting material, such as concrete, is being cast and cured, a pair of long Apparatus 10 for holding reinforcing members C, C'; a pair of elastic legs each adapted to surround and hold a corresponding one of said reinforcing members C, C'; Leg 1
2, 16, each of the legs being pre-helically formed into a multi-turn helix having a predetermined inner diameter and an open pitch, the said inner diameter of each helix being smaller than the outer diameter of the corresponding reinforcing members C, C', said pitch allows said leg 1 to be adjusted without exceeding the elastic limits of the material of which the device is constructed.
2, 16 are of sufficient length to be able to be wrapped around the corresponding reinforcing member C, C', and the axes of the legs 12, 16 lie in a common plane. , each of the legs 12, 16 having spaced apart ends interconnected by a bridge portion 14, each of the bridge portions 14 having opposing ends integral with one of the ends of said legs. has an end, and (i)
(a) A portion of the bridge portion 14 located between the pair of reinforcing members C and C' or (b) the leg portions 12, 1
(ii) the free end 22 of the legs 12, 16 on the side facing away from the bridge portion 14; 24, or (iii) a spacer in which both of (i) and (ii) above are curved from a plane containing the axes of the legs 12 and 16 and which comes into contact with the surface of the formwork during the casting operation. The legs 12, 16 and the bridge portion 14 are adapted to position the reinforcing members C, C' in cooperation with each other so that the reinforcing members C, C' are placed in the formwork. A reinforcing member holding device is provided, the reinforcing member holding device being spaced apart from a surface of the reinforcing member holding device. Note that the symbols in parentheses above indicate the symbols in the attached drawings (which will be described in detail later).

The pouring of concrete, particularly reinforcing concrete used for industrial floors, etc., involves the movement of very large amounts of concrete in a plastic state. During this concrete pouring period, it is important to hold the reinforcing elements in the preselected position, and the reinforcing elements must be held in place relative to each other. The holding device of the present invention allows such holding and positioning to be carried out accurately. In the present invention, the elastic legs 12 and 16 are formed in a spiral shape in advance.
grips the reinforcing member firmly. bridge part 1
4 holds the reinforcing members in preselected positions relative to each other. A bridge portion 14 is prefabricated in the device of the invention to maintain the spacing between the reinforcing member and the concrete pouring base surface. Positioning is achieved by a simple holding device that grips the reinforcing member in the manner described above, and displacement (misalignment) is unlikely to occur. A reinforcing member provided with such a locking mechanism at a predetermined position eliminates the mutual movement (displacement) of the reinforcing members from their predetermined positions, which has been a problem in the prior art.

In the present invention, a pair of long reinforcing members C, C' are laterally locked to each other at predetermined positions above the concrete pouring foundation surface. This consists of an elastic leg 12 formed in advance in a spiral shape around the reinforcing members C and C'.
This is achieved by sowing 16. Since the legs 12, 16 are wrapped around the reinforcing member, it is impossible for the retaining device of the present invention to become unlatched (i.e., detached from the reinforcing member). Additionally, the legs 12, 16 also hold the bridge portion 14 in place. This locking (retention) mechanism is important when considering the adverse conditions encountered during concrete pouring. By using the reinforcing member retainer according to the present invention, each of the aligned reinforcing members is locked in place and held in position above the concrete pouring foundation surface.

The reinforcing member retainer of the present invention is preferably made of steel, and for pouring concrete may be made of stainless steel, which is particularly useful when the retainer appears on the surface of the casting. .

In the case of casting of synthetic plastic material, this holding device itself is made of plastic material or
It may be coated with this material, for example made of glass fiber reinforced resin.

The retaining device of the present invention is a spacer that maintains the distance between the reinforcing member and the concrete pouring foundation surface. This base surface is a part of the mold wall for the casting material or a bed or floor on which the casting is formed. For example, in concrete casting, this type of spacer is used to keep the reinforcing member spaced from the formwork or from the mold floor or bed while the concrete is being poured and cured. The pair of reinforcing members are parallel, so in this case the retaining device of the invention is preferably preformed in a U or C shape, with each part of the retaining device being wrapped around each of the pair of reinforcing members. are generally U- or C-shaped parallel arms, and even in staggered configurations these portions are generally parallel arms. The portions joining these arms may be straight or curved. If these reinforcing members are similar, each part of the device will have the same helical diameter,
Preferably, the device has a pitch length and twist, and the device is first made by bending and cutting a continuous helical stock, so that the stock portion is also unwound and the non-helical portion is may be formed. However, if the reinforcing members have different diameters, it is preferred that the internal diameters and pitch lengths of the helical members are correspondingly different.

The inner diameter of each helical portion in each retainer is slightly smaller than the outer diameter of the reinforcing member to which it is applied, and the pitch length is considerably larger;
It must therefore be constructed in such a way that it can be applied to reinforcing elements by wrapping from one side without exceeding the elastic limit. (Within the above elastic limit,
There is no permanent deformation of the instrument and arbitrary gripping can be achieved).

The reinforcing member may generally be a cylindrical rod, but if it is a cable-like strand, it is preferably the same as the strand rather than the helical portion of the device, and the pitch length is the same as the pitch length of the strand. The strands can be made slightly different (smaller) to provide the strand with maximum resistance to longitudinal movement of the device. The grip of the retaining device is preferably enhanced by grit or other abrasive material added to the inside of the helical member, or by toothing on the inside of the helical member that engages the reinforcing member.

The features and advantages of the invention will become clearer from the following examples, which are described by way of example with reference to the drawings.

Referring in more detail to the drawings, these figures show a reinforcing member holding device according to the invention for use with reinforcing members C, C′, which device is positioned in the mold while concrete is being poured into the mold. The reinforcing member and retainer are embedded in the concrete, and the concrete is then allowed to harden.
The retaining device attempts to hold the reinforcing members C, C' in place without necessarily reinforcing the concrete itself (although it can be designed to do so). These reinforcing elements C, C' are usually arranged in a flat arrangement, in which case the concrete body forms a floor, ceiling or wall covering. Other geometric arrangements are also possible when making prefabricated concrete sections. For example, reinforcing member C,
C′ can be arranged in a cylindrical arrangement or in a peg-like arrangement.

The retaining device 10 shown in FIG. 1 consists of a generally U-shaped helical preformed helical element. This element has an elastic leg 12 wrapped around one reinforcing member C, and a longitudinal axis between the leg 12 and the reinforcing member C.
a bridge portion 14 extending perpendicularly to the longitudinal axis of the reinforcing members C and C′ and forming a downward loop to engage the mold, bridging the gap between the reinforcing members C and C′; ' Another elastic leg 16
It consists of The leg 12 is preferably made of an elastically flexible material preformed into a helical member having an inner diameter smaller than the diameter of the reinforcing member C, and the leg can be wrapped around the reinforcing member without exceeding its elastic limit. It has an open or wide pitch that can enclose the area. The corner between bridge portion 14 and legs 12 and 16 connects them to legs 12 and 16.
by positioning it on the appropriate side of the helical member so that it lies flat against the reinforcing member.

Although the illustrated retaining device consists of a single device element 10, it could also be formed from a ribbon of a plurality of similar elements 10 arranged side by side and intertwined.

In a typical application, reinforcing members C and C' have a diameter of 12 mm and a spacing of 100 mm. The helical member of the holding device 10 has an inner diameter of 9.5 mm and is made of hard steel. A similar device is used as reinforcing member C.
They are placed at intervals of 1 to 2 m along C'.

The retainer shown in FIG. 2 is similar to that shown in FIG. 1, except that the bridge section 14 consists of a straight section and loops 18 and 20. During casting, the loops 18 and 20 engage the mold or bed of the concrete part being cast in order to maintain the spacing between the reinforcing members C and C' and the floor or bed. The device thus serves to space the reinforcing members, rods C and C', from each other as well as from the floor or bed.

The apparatus shown in FIG. 3 has projections 22 and 24 forming legs that engage the mold bed or bed at the free ends of legs 12 and 16. In this instrument, the bridge section 14 is straight, but in another similar instrument shown in FIG. 4, the bridge section 14 forms a suspension loop that also engages the mold bed or bed.

[Brief explanation of the drawing]

Figures 1-4 apply to a pair of long reinforcing members, maintaining a predetermined spacing between the reinforcing members, and maintaining a predetermined spacing from each of the reinforcing members to the bed or floor of the mold. FIG. 2 is a schematic perspective view of the holding device of the present invention. 1A and 2A are respective end views of the instrument shown in FIGS. 1 and 2; FIG. C, C'... Reinforcement member, 10... Reinforcement member holding device, 12, 16... Leg portion, 14... Bridge portion, 18, 20... Loop, 22, 24... Protrusion.

Claims (1)

[Scope of utility model registration request] A pair of elongated reinforcing members C, C' are placed within the casting material, such as concrete, facing each other and spaced apart from the surface of the form while the casting material is being cast and cured. Apparatus 10 for holding
comprising a pair of elastic legs 12, 16, each of which is adapted to surround and hold a corresponding one of the reinforcing members C, C'; is helically formed in advance into a large number of turns of helix with a predetermined inner diameter and open pitch, and the above-mentioned inner diameter of each helix is equal to the outer diameter of the corresponding reinforcing member C, C'. smaller than
The pitch is of sufficient length so that each of the legs 12, 16 can be wrapped around the corresponding reinforcing member C, C' without exceeding the elastic limits of the material of which the device is constructed. The leg portions 12,1
The axes of the legs 1 and 6 lie in a common plane, and
2, 16 each have spaced apart ends interconnected by a bridge portion 14, each having an opposite end integral with one of the ends of said legs; and (i) at least the portion of the bridge portion 14 located between the pair of reinforcing members C and C' or (b) the opposing end integral with the end portions of the leg portions 12 and 16. or (ii) the free ends 22, 24 of the legs 12, 16 on the side facing away from the bridge portion 14;
or (iii) both of the above (i) and (ii) are the leg portions 12,
The legs 12, 1 are curved from a plane containing the axes of the legs 12, 1 to provide a spacing that contacts the surface of the mold during the casting operation.
6 and the bridge portion 14 are the reinforcing members C,
C' are positioned in cooperation with each other, and the reinforcing members C,
A reinforcing member holding device characterized in that C' is spaced apart from the surface of the formwork.