CN112196120A

CN112196120A - Metal wire ring box

Info

Publication number: CN112196120A
Application number: CN202010652524.4A
Authority: CN
Inventors: A·瑞宝
Original assignee: R Group Baltic Ltd
Current assignee: R Group Baltic Ltd
Priority date: 2019-07-08
Filing date: 2020-07-08
Publication date: 2021-01-08
Also published as: FI20195620A1; FI129715B; EP3763896A1; WO2021004903A1

Abstract

The invention relates to a wire loop box for use in a post-cast joint between wall elements, comprising a housing (2) and a wire rope (1), wherein a loop is passed through the housing through a perforation in the housing (2) and fastened thereto, such that the wire rope (1) forms a grab loop (3), wherein protruding ends (4) are fastened to each other with sleeves (5). In order to keep the grab ring (3) in a straightened position without assistance, the wire rope (1) comprises a plurality of strands (9) of filaments (10) in a helical configuration, and at least one rod (8) having a cross section larger than the cross section of a single filament (10) is wound around the wire rope (1) along the outer circumference of the wire rope (1).

Description

Metal wire ring box

Technical Field

The present invention relates to a wire loop box for use in post-cast joints between concrete wall elements and between other reinforced concrete elements, the wire loop box comprising a shell to be mounted on the joint and a wire loop to be attached to the shell.

Background

One of the disadvantages associated with the above arrangement is that the wire loop should remain in the box during transport and installation, and when installed, the wire loop should extend out of the box to a straightened position so that vertical rebar can be installed through the loop.

Various wire loop cassettes are known from the prior art. One solution is to manually guide the rebar through the slack loop, but this is time consuming and requires additional work. An advanced solution is to add a separate spring attached to the wire to obtain the elastic characteristics of the wire. However, this solution requires additional materials and manufacturing steps.

Disclosure of Invention

The object of the present invention is to provide a wire loop cassette which overcomes the above-mentioned disadvantages. The object of the invention is achieved by a wire loop according to independent claim 1. Preferred embodiments of the invention are disclosed in the dependent claims.

When the wire loop is provided with at least one rod having a larger cross-section than the single filament, the wire loop becomes easier to handle, since the wire loop can be held in the desired position during use.

Drawings

In the following, the invention will be described in more detail by way of example and with reference to the accompanying drawings, in which

FIG. 1 shows a wire coil box;

FIG. 2 shows a wire loop cassette with fasteners;

FIG. 3 shows a first embodiment of a wire rope for the wire loop box of FIG. 1;

fig. 4 shows a cross-sectional view of a second embodiment of a wire rope for the wire loop box of fig. 1.

Detailed Description

Fig. 1 and 2 show a wire loop box comprising a housing 2 made of steel plate or another applicable material and a wire rope 1 made of steel (e.g. made of high strength steel). The wire rope 1 is arranged to pass through a perforation in the housing 2 and to be fastened to the housing 2. The housing 2 may be manufactured by mechanical cutting and bending and comprises a longitudinal wall 6 and at least two side walls 7. The housing 2 may not be a sealed housing 2 but may comprise openings in various locations.

The wire rope 1 is passed through a perforation in the housing 2 so that the wire rope 1 forms a gripping loop 3 on one side of the housing 2 and the protruding ends 4 are fastened to each other with a sleeve 5 on the other side of the housing 2. The perforations may be located at different positions in different housings 2. The sleeve 5 may be any type of metal crimping sleeve, such as a hexagonal compression sleeve, for example, having a high tensile strength for holding the protruding ends 4 together in use.

As shown in fig. 2, the grip ring 3 may be placed in the housing 2 by bending the grip ring 3 with a fastener 11 such as an adhesive tape or a band. Furthermore, the curved grab ring 3 requires less space on the inside, which is useful during transport from the manufacturer or warehouse.

The wire rope 1 may be coated for protection or to add better mechanical properties. Such a coating may be metallic (e.g. zinc) or non-metallic (e.g. PVC). A coating may also be applied to at least one of the rods 8, strands 9 and filaments 10 such that at least a portion of the wire rope 1 is encapsulated in the coating.

Fig. 3 shows a first embodiment of a wire rope 1 for the wire loop box of fig. 1. The wire rope 1 comprises a plurality of strands 9 in a first helical configuration, each strand 9 comprising a plurality of filaments 10 in a second helical configuration. At least one of the strands 9 is replaced by a rod 8, said rod 8 being wound around the wire rope 1 along the outer circumference of the wire rope 1 in a first configuration. The cross-section of the rod 8 is larger than the cross-section of the single filament 8. In this context, the term cross-section refers to the cross-sectional area of the filaments 10 and the rod 8. The filaments 10 may be made of metal, but other materials having high tensile strength may also be used. In some embodiments, the diameter of the shaft 8 is substantially equal to or greater than the overall diameter of the individual strands 9.

The stem 8 may be made of a different material having a different yield strength than the steel material used in the filament 10. Such a material may be, for example, carbon structural steel (e.g., Q195), or a polymer. Alternatively, the rod 8 may be made of the same material as the filament 10.

With the new cord arrangement and by selecting a suitable material for the rod 8, the grab ring 3 can be elastically deformed in a bent configuration within the housing 2 when the fastener 11 is attached to the housing 2. Due to the elasticity, the rod 8 is arranged to pull the curved grab ring 3 straight out from the housing 2 (as shown in fig. 1) to a straight position without additional assistance when removing the fastener 11 and mounting the wire loop box on the joint of the concrete wall element.

An alternative is to plastically deform the rod 8 of the grab ring 3 in a bent configuration within the housing 2. In this alternative, the fastener 11 is not necessarily required. The rod 8 is arranged to straighten the curved grab ring 3 upon manual assistance, so that the rod 8 remains in a straightened position when the wire loop box is mounted on the joint of the concrete wall element without additional assistance.

Once the grab ring 3 is held in the straightened position without additional assistance, it is quick and easy to thread the reinforcing bars through the loops to fix the concrete elements to each other.

The scope of the invention is not limited by the number of rods 8, strands 9 or filaments 10. The size of the wire loop box and the type of wire rope 1 are selected according to the width of the seam used. The required concrete strength and the spacing between the wire eye boxes is determined based on the shear forces given in the structural design.

Fig. 4 shows a cross-sectional view of a second embodiment of a wire rope 1 for the wire loop box of fig. 1. In this embodiment, the wire rope 1 comprises six strands 9 and one rod 8. Each strand 9 comprises seven filaments 10.

In practice, the wire rope may be dimensioned with a diameter of 0.38mm for the filaments 10, 2.0mm for the stem 8 and 6mm for the wire rope 1, or alternatively 0.51mm, 2.6mm and 8mm, respectively, or still alternatively 0.58mm, 3.0mm and 9mm, respectively. The diameter of the rod 8 is at least three times the diameter of the filaments 10.

In the described arrangement no additional steps are required to ensure that the grab ring 3 is in a straight position when the reinforcement bars are passed through, or no additional parts are required to assist the rope 1 to keep the grab ring 3 in this straight position when the wire loop box is mounted over the joint of the reinforced concrete wall element.

With this arrangement, additional material costs and time may be saved in case the rod 8 is wound with a strand 9 to form the cord 1 and the cross section of the rod 8 is larger than one single filament 10 of the strand 9. The tensile strength obtained is about 10% higher than for a rope of the same diameter without the rod 8. Higher tensile strength means greater durability. From another point of view, the thickness of the wire rope 1 can be smaller to maintain the required tensile strength, which means less material and thus even lower material costs.

In some embodiments, the wire rope 1 comprises an odd number of bars 8 and an even number of strands 9, for example one bar 8 and six strands 9, such that the wire rope 1 has a full circular periphery and each bar 8 contacts two strands 9 on the periphery of the wire rope 1. In another embodiment, the wire rope 1 comprises an even number of rods 8 and an odd number of strands 9, e.g. two rods 8 and 17 strands 9, such that the wire rope 1 has a full round outer circumference and each rod 8 contacts two strands 9 on the outer circumference of the wire rope 1. As mentioned above, the scope of the invention is not limited by the number of strands 9, filaments 10 or rods 8. Another embodiment not shown may for example have 35 filaments 10 in one strand 9 and 19 filaments in the other strand 9. Another embodiment not shown may for example have 33

strands

9 and 2 rods 8.

It is obvious to a person skilled in the art that with the advancement of technology, the inventive concept may be implemented in various ways. The invention and its embodiments are not limited to the examples described above but may vary within the scope of the claims.

Claims

1. A wire loop box, comprising:

a housing (2);

a looped wire rope (1) which is passed through the housing (2) through a perforation in the housing (2) and fastened thereto such that the wire rope (1) forms a grab loop (3), wherein the protruding ends (4) are fastened to each other with a fastening sleeve (5),

wherein the wire rope (1) comprises: a plurality of strands (9) of filaments (10) in a helical configuration, at least one rod (8) having a cross section larger than the cross section of a single filament (10) being wound around the wire rope (1) along the periphery of the wire rope (1).

2. A wire loop cassette according to claim 1, wherein the housing (2) comprises a removable fastener (11) which, when the fastener (11) is attached to the housing (2), holds the grab ring (3) elastically deformed in a bent configuration within the housing (2), and when the fastener (11) is removed, the rod (8) pulls the bent grab ring (3) straight out of the housing (2).

3. A wire loop cassette according to claim 1, wherein the grab ring (3) remains plastically deformed in a bent configuration within the housing (2) and the rod pulls the bent grab ring (3) straight out from the housing (2) when manually assisted.

4. A wire loop cassette according to any of claims 1-3, wherein the diameter of the rod (8) is substantially equal to or larger than the diameter of an individual strand (9) of the wire rope (1).

5. A wire loop cassette according to any of claims 1-4, wherein the rods (8) are made of a different material than the filaments (10) of the strands (9).

6. The wire loop cassette according to any of claims 1-5, wherein the ratio between the diameter of the rods (8) and the diameter of the filaments (10) is at least 3.

7. The wire loop cassette according to any of claims 1-6, wherein the ratio between the diameter of the rods (8) and the diameter of the filaments (10) is at least 5.

8. A wire coil box according to any of claims 1 to 7, wherein the housing (2) comprises a longitudinal wall (6) and at least two side walls (7).

9. A wire loop box according to any of claims 1 to 8, wherein the fastening sleeve (5) of the straight part (4) is a hexagonal wire compression sleeve.

10. A wire loop cassette according to any of claims 1-9, wherein at least one of the rods (8), the strands (9) and the filaments (10) is encapsulated in a coating.

11. A wire loop box according to any of claims 1-10, wherein the wire rope (1) is encapsulated in a coating.