JP2021517936A - Reinforcing cable with increased adhesion - Google Patents

Abstract

The present invention can be used in the manufacture of prestressed reinforcing materials. The challenge to be solved is to develop a reinforced cable with increased coupling, which guarantees structural stability and increases coupling with concrete, durability, and stress relaxation resistance. offer. In the reinforcing cable, the central wire (1) is arranged along the axis of the cable and is composed of a spiral groove (2) having a pitch equal to the twist pitch of the cable. The inner layer strand wires are placed in the grooves, each of the wires in contact with the center wire and in contact with the two adjacent wires in the inner layer. The strand wires are arranged spirally at equal intervals in the outer layer, and each of the wires is arranged in a groove between the strand wires in the inner layer and is in contact with the latter.

Description

The present invention relates to the manufacture of cables and to the manufacture of prestress reinforcements designed for prestress by joints and poststress by channel injection.

A 7-wire reinforcing cable described in GOST R 53772-2010 is known, which has a central wire with a smooth surface and a crescent-shaped recess under the cylindrical generatrix on the wire surface (vertical). It consists of 6 strand wires with a periodic profile (three arranged in a row). The strand wires are spirally arranged around the central wire to form one concentric layer. Each strand wire is in contact with a center wire and two adjacent strand wires.

The drawback of this design is the relatively low degree of bonding with concrete. Known cables formally have additional mechanical joints in the screwing direction. However, in general, high bonding with concrete is not provided. Because the height of the element as a periodic profile is low, the cable is pulled under the action of the load applied to the reinforced concrete and it is not possible to maintain a mechanical bond during the Poisson narrowing of the cable. be.

In addition, the above-mentioned elements as a periodic profile transfer the stress of the reinforcing material due to being used as a bearing and the stress due to shear load to a part of the concrete placed directly in the recess, or the load due to tangential stress. Communicates to the block. Further, the degree of coupling is low because the distance between the circumscribing circle around the cross section of the cable and the surface of the outer wire is narrow. For this reason, no space is left under the bus bus for providing a strong concrete ridge.

Another drawback of known reinforced cables is that they have reduced durability and mitigation properties compared to similar cables made of plain wire. This is because the periodic profile forms a large number of stress concentrations, which reduces the mechanical properties themselves. In addition, the periodic profile on the contact surface causes point contact between adjacent wires, which further increases stress concentration. And because of the local introduction of adjacent wires at the point of contact to others, or the resulting displacement that reduces the radius when installed and directly increases the length of the wire. Reduces relaxation characteristics. This results in an increase in cable length when used in structures and, as a result, a decrease in pretension.

The closest prior art of the cable according to the invention is the reinforced cable according to patent RU 2431024, which comprises a central wire and a strand wire spirally wound around it and having a periodic profile.
The periodic profile has the shape of a protrusion that slopes and projects above the bus of the cable reduction plane, and the area of the wire surface that comes into contact with other wires is a spirally arranged flat surface. Provided in form.
The periodic profile is applied on the outer region of the surface of the strand wire. The dimension of the spacing between the circumscribing circle around the cable cross section and the surface of the outer wire is increased as compared to the dimension of the spacing in the circular wire cable. This is the cross-sectional shape of a wire with a region extending on the outer surface of the cable in two layers so that the contour connecting the outer regions of the strand wire tangentially approximates a triangle with rounded corners, and such a wire. This is due to the arrangement of.
Known cables have a high degree of coupling due to the inclined surfaces developed to form a spirally twisted triangular cross section. This makes it possible to transfer the stress of the stiffener to the concrete through a support reaction, i.e. normal stress. Its tolerance is higher than that of tangential stress. It also makes it possible to maintain contact between the concrete surface and the stiffener during its Poisson narrowing.
In this case, the large spacing between the circumscribing circle around the cable cross section and the surface of the outer wire leaves space under the cable bus to form a strong concrete ridge, increasing the contour covering the cable. It is an additional factor to increase the degree of coupling.
In addition, known cables are wires whose surface contact between the wires, a smaller number of elements of the periodic profile, and their arrangement extend over the outer surface of the cable and are above the plastically compressed surface. By being present only in the area of, it has increased durability compared to the prior art discussed earlier in order to reduce stress concentration when applying it.

A drawback of known cable designs is poor stability with high connectivity. This is because during the manufacturing process, as the cable passes along the pulleys and guides, one of the outer layer strand wires has a smaller radius between the inner layer strand wires with their lateral displacement. Limited by the structural instability of the cable due to the risk of pressing against. As a result, the predetermined mutual position of the wires is lost, and the outer surface of the cable loses the inclined surface that can be joined via the interlock.

Such a change in the form of the cable causes a frequent decrease in the degree of bonding with concrete.
In addition, local changes in the configuration of the cable lead to an increase in the load on the wire where their mutual position changes, which negatively affects the durability and relaxation resistance of the cable.

An object of the present invention is to develop such a reinforced cable with increased bondability, which guarantees structural stability and thus increases bondability, durability and relaxation resistance to concrete. Fully provide to let.

The problem is a reinforced cable with increased connectivity, which consists of two concentric layers, a central wire and a strand wire spirally arranged around it. Spiral grooves are provided in the direction of the cable twist at a pitch equal to the pitch of the cable twist, and the inner layer strand wires are placed in these grooves, each with a central wire and two adjacent strand wires in the inner layer. In contact, in the outer layer, the three strand wires are arranged spirally at equal intervals with each other, and each wire is in contact with two adjacent strand wires in the inner layer and is arranged between the strand wires arranged in the groove. Is solved by.

In this case, the most rational is the design of a cable with six strand wires in the inner layer, each located in a groove on the surface of the central wire, with three strand wires in the outer layer.

The spirally grooved center wire ensures that the positions of all the strand wires in the inner layer with respect to the center wire are firmly fixed and to the outer strand wires located between the inner layer wires with their lateral relative displacements. Eliminate the pressure of. This guarantees the stability of the required cable configuration.

In this case, the spiral grooves on the center wire can be provided at equal and greater and smaller spacings from each other.

The outer layer strand wire can be provided with a smaller cross section as compared to the inner layer strand wire.

Helicoids that are continuous along the length can be provided in opposite regions on the surface of adjacent strand wires and in outward regions on the surface of the inner layer of strand wires.

The helicoid can also be provided in the outward area of the surface of the outer layer strand wire.

Periodic profiles can be provided on the surface of one or more strand wires. For example, the periodic profile can be in the form of protrusions that slope above the surface of the helicoid in the outward region of the surface of the strand wire. In this case, the wires of the cable may have, for example, a zinc-based anticorrosion coating.

Hereinafter, the present invention will be described with reference to the drawings.
Figure 1 schematically shows the appearance of a reinforced cable with increased connectivity for structure 1 + 6 + 3; FIG. 2 schematically shows a cross section of the reinforcing cable of FIG.

FIGS. 1 and 2 show a reinforcing cable according to an embodiment of the present invention.

A linear center wire 1 is arranged along the axis of the cable and is configured with six spiral grooves 2 on the surface, on which six inner layer strand wires 3 are arranged. The wires are in close contact with each other and are in contact with the groove 2 of the central wire 1. There are three outer layer strand wires 4 in the spacing between the inner layer strand wires 3, and the wires are firmly in contact with the inner layer strand wires 3. The area of the surface of the inner layer strand wire 3 in contact with the surface of the adjacent strand wire 3 of the inner layer, the area of the surface of the outer layer strand wire 4 and the area of the outer layer strand wire 4 in contact with the surface of the inner layer strand wire 3 The surface area is provided in the form of a helicoid surface 5. The helicoid 5 is visible to the naked eye, has a boundary with the rest of the surface of the wire, and is represented as a linear region of the surface of the wire.

The regions of the inner layer strand wire 3 and the outer layer strand wire 4 extend to the outer surface of the cable and have spiral surfaces 6 and 7, respectively, and each inner layer strand wire 3 has one spiral surface 6 and the outer layer. Each strand wire 4 of the above has two helicoids 7.

The surface of the inner layer strand wire 3 is provided with a periodic profile in the form of protrusions 8 over the linear generatrix of the helicoid surface 6.

As described, the design of the reinforced cable allows for maximum structural stability of the cable.

The reinforcing cable is manufactured as follows.
The wire 1 having the spiral groove 2 applied to the surface and the circular cross-section wires 3 and 4 is manufactured in advance. During production, the wire can be coated with, for example, a zinc-based corrosion resistant coating. The wires are then laid together to form the cable, for example using any known towed wire cable feeder. In the middle of the cable laying is a reduction in a gauge roller with a tilting roller that rotates with the rotor of the wire cable feeder.

As a result of the shrinkage, the wires are strongly pressed against each other and deformed, while spiral surfaces 5 are formed on the contact surfaces of the inner and outer strand wires 3 and 4, respectively, and the strand wires 3 and 4 are formed on the surface of the cable. Interaction points with the spiral surfaces 6 and 7 of the gauge roller are formed, respectively.

At the same time as the cable shrinks, a periodic profile in the form of a protrusion 8 protruding above the linear bus of the helicoid 6 is applied to the inner strand wire 3.
The cables formed are then subjected to any known method, eg, between two capstans, each of which is a set consisting of a drive pulley and a non-drive pulley, or between two drive pulleys, with a destructive force of 30-80. It is pulled to the force of%.

The section between the first and second capstans when the reinforcing cable is pulled straight is heated to 370-430 ° C by the means of the inductor and then also in the section between the first and second capstans. The pulled cable is forcibly cooled.

After cooling is complete, the cable passes through the second capstan and reaches the accumulator coil. After the wire is consumed by the wire cable input machine to at least one of the coils mounted on the rotor, or by the wire cable input machine when rewinding the external coil, the technical process goes to the wire cable input machine. Suspended to insert the wire. At the same time, the storage coil is replaced with the same empty storage coil and the filled storage coil is moved away from the rewind region. The finished cable wound around the storage coil is unwound onto the container coil or spool and packed by known methods.

1: Center wire, 2: Spiral groove, 3: Strand wire, 4: Strand wire, 5: Spiral surface, 6, 7: Spiral surface, 8: Protrusion.

Claims (11)

Two concentric layers consisting of a spirally arranged central wire and a strand wire, with spiral grooves on the central wire in the direction of the cable twist at a pitch equal to the pitch of the cable twist, and an inner strand wire. Are placed in these grooves, each of which contacts the center wire and two adjacent strand wires of the inner layer, the outer layer strand wires are arranged spirally at equal intervals from each other, and each of the outer layer strand wires. A reinforced cable with an increased degree of bonding that contacts two adjacent strand wires in the inner layer and is placed between the strand wires that are placed in the groove. The reinforcing cable according to claim 1, wherein the reinforcing cable has six strand wires in the inner layer, each of which is arranged in a groove on the surface of the wire, and is three strand wires in the outer layer. The reinforcing cable according to claim 1, wherein the spiral grooves of the central wire are provided at equal intervals with each other. The reinforcing cable according to claim 1, wherein the spiral grooves on the central wire are provided alternately with a larger interval and a smaller interval from each other. The reinforcing cable according to any one of claims 1 to 4, wherein the outer layer strand wire has a smaller cross section than the inner layer strand wire. Claim that the spiral surface continuous along the length is provided in a region facing the surface of the adjacent strand wire, and the spiral surface is also provided in a region of the inner layer facing the outside of the surface of the strand wire. Reinforcement cable described in any of 1-5. The reinforcing cable according to claim 6, wherein the spiral surface is also provided in the outward area of the surface of the strand wire of the outer layer. The reinforcing cable according to any one of claims 1 to 7, wherein the surface of at least one strand wire has a periodic profile. The reinforcing cable according to claim 8, wherein the periodic profile is in the form of a protrusion inclined upward on the surface of the helicoid in the outwardly facing region of the surface of the strand wire. The reinforcing cable according to any one of claims 1 to 9, wherein the wire has an anticorrosion coating. The reinforcing cable according to claim 10, wherein the main component of the anticorrosion coating is zinc.

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