JP2001192988A - Cable for structure for building structure, method of producing the cable and independently protected element wire group useful for the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of completely packing a packed product packed by forming a route between a plurality of independently protected element wire groups into a tube. SOLUTION: In this method for producing a structure cable for building structure by arranging independently protected element wire groups 24 in an outer tube, injecting a packing product into the inside of the outer tube so that the packing product is substantially packed into a space around outer coatings 25 of the independently protected wire groups 24 and curing the packed product, the outer coatings 25 of the independently protected wire groups 24 have a plurality of swellings 26 at intervals in the direction of a cable, the independently protected element wire groups 24 are arranged in such a way that the swellings of the outer coatings 25 in the outer tube are mutually shifted in the lengthwise direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a construction of the type comprising an outer tube or sheath, a group of independent protective wires contained in a tube part, and a filling product injected into a tube around the group of wires. The present invention relates to a structural cable for a structure.

[0002]

2. Description of the Related Art Generally, an apparatus for suspending a structure is
At least one suspension cable having both ends fixed, and suspension members each connected to a collar fixed around the suspension cable. The suspension transmits the load of the structure to the suspension cable. In most cases, the hanger is not necessarily perpendicular to the hanger cable, so that at least some of the collars have a force that has a tangential component to the hanger cable, called the tangential force. Will be given to.

[0003] Usually, a suspension cable is composed of a bundle of bare steel wires or strands.
It is covered with an outer protective layer of paint or bitumen or a tubular covering. This protective layer is generally interrupted at the longitudinal position of the collar which is tightly fastened directly to the steel wire of the suspension cable.

The extremely tight fastening of the collar satisfies the following two main functions. 1) The tangential force received by the collar is received by friction.
That is, at low levels of the steel-to-steel coefficient of friction, the clamping force of the collar must be correspondingly high. 2) The relative movement between the pulled wires (steel wires or wires) constituting the suspension cable is reduced as much as possible. It is because these strands are bare, and their relative movement causes wear and fatigue due to "fretting corrosion" (fatigue or wear caused by minor slippage), which causes the collar to relax and This is because the wire of the part may be destroyed.

[0005]

SUMMARY OF THE INVENTION These prior art suspension structures have the following problems. 1) Extremely tight collars require very long (eg, up to 2 meters) and heavy collars to be tightened with many bolts. 2) The effect of "fretting corrosion" cannot be completely prevented. 3) It is often observed that corrosion spreads under the outer protective layer of the cable.

[0006] European Patent Application Publication 0 789 11
In the case of 0, the uniformity of the tightening can be improved by inserting a shape material inside the collar between the superposed layers of the strands of the suspension cable so as to fill the gap between the strands. Proposed. These inserts, when placed beneath the collar, transmit this clamping force around the entire circumference of the strand, almost hydrodynamically, rather than concentrating the clamping force on the line where the strands contact each other. .

[0007] In French Patent No. 2 739 112, the collars are connected to each other by an auxiliary connecting cable so as to reduce the force of clamping the collar on the suspension cable, ie to compensate for the static part of the tangential force due to the nominal load on the structure. Strategies for connecting are described. Dynamic parts (overloads that fluctuate due to traffic, climatic conditions, etc.) are caught by the force tightening the collar on the suspension cable. This process requires a continuous connecting cable that is pulled according to the specified tension.

Further, in a structural cable of a construction structure of a type in which a plurality of wire groups are arranged in an outer tube and a filling product is injected into a tube around the wire group, the filling product is a wire. If the circumference of the group is not evenly filled, there is a problem that a compressive strength corresponding to a tangential force cannot be obtained, and a failure occurs due to direct contact between the strand groups.

It is a primary object of the present invention to provide a method of completely filling a tube with a filling product injected by providing a passage between a plurality of independent protective strands.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method of manufacturing a structural cable for a construction structure, wherein a group of independent protective strands is disposed in an outer tube, and a filling product is formed of an outer covering of the group of independent protective strands. In a method of manufacturing a structural cable for a construction structure, wherein the outer coating of each independent protective strand is injected into the outer tube so as to substantially fill the surrounding space and the filling product is cured. A plurality of bulges are provided at intervals along the direction of the cable, and the independent protective strands are arranged in the outer tube such that the bulges of the respective outer coatings are longitudinally offset from one another.

Preferably, a force is applied to the cable after infusion and curing of the filling product, the filling product may be comprised of one or more of cement grout, polymer and resin, each of which is a separate protective strand. The outer coating of the group may be high density polyethylene.

[0012] The structural cable of a construction structure according to the present invention comprises:
Construction comprising an outer tube, a group of independent protective strands contained within the outer tube, and a cured-filled product substantially filling the space around the outer coating of the group of independent protective strands within the outer tube. In the structural structural cable, the outer sheath of each independent protective strand has a plurality of bulges spaced along the direction of the cable, and the independent protective strands have their respective outer wraps in an outer tube. The bulges of the coating are arranged such that they are longitudinally offset from one another.

[0013] The filling product may be composed of one or more of cement grout, polymer and resin, and the outer coating of each independent protective strand may be high density polyethylene.

A suspension bridge according to the present invention is a suspension bridge including at least one suspension cable, a deck, and a suspension member for connecting the deck to the suspension cable. It is a structural cable.

The independent protection strand group used in the method for producing a structural cable of a construction structure according to the present invention has at least one metal strand included in an outer covering of the independent protection strand group. The coating has a plurality of swellings spaced along the direction of the strand group.

The outer covering of each independent protective strand group of the present invention is as follows:
It has a plurality of bulges at intervals along the direction of the cable, and the independent protective strands are arranged in the outer tube so that the bulges of the respective outer coatings are arranged so as to be shifted in the longitudinal direction from each other. A passageway for the filling product is formed between the groups of independent protective strands, and the injected filling product completely fills the tube.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the present invention is applied to a suspension bridge will be described with reference to the drawings.

Conventionally, the suspension bridge shown in FIG. 1 is composed of a deck 1, two towers 2, two parallel suspension cables 3 (only one is shown in the figure), and a suspension connected to the suspension cable 3 to support the deck 1. Material 4 is provided.

A suspension cable 3 is provided at each end of the bridge by two ground anchors 5 (ie, artificial anchoring blocks, rock anchors, or, in the case of a "self-fixed" suspension bridge, at both ends of the deck, if necessary). (Anchor) and are supported by tower 2. It is desirable that the suspension cables 3 are fixed to the towers 2 at the positions of the towers 2 in the longitudinal direction and are discontinuous.

Each of the suspension cables 3 includes one or a plurality of independent protection element groups 6, one example of which is shown in FIG.

Inside each of the independent protective strand groups 6, the actual strands 7 form a member that is effective during towing. The strand 7 is composed of a plurality of (seven in the illustrated example) twisted steel wires. This steel wire is corrosion resistant (galvanized, zinc-aluminum alloy coating, etc.)
May have been given. The strands 7 are embedded in a lubricating material 8 which is itself covered by an outer covering 9 made of a flexible plastic material such as, for example, high density polyethylene (HDPE). The lubricating material 8 also protects the steel of the wire from corrosion. The lubricating material 8 is generally grease or wax.

The group of independent protective wires 6 of the suspension cable 3 is housed in an outer tube 10 extending over the entire length between the fixed ends of the suspension cable 3. The cured filling product 12 fills the remaining space between the outer tube 10 and the outer sheath 9 of the strand (see FIG. 2). The outer tube 10 may be made of a metal or a plastic material such as HDPE. The cured fill product 12 may be a cement grout, a polymer or a resin.

The lower end of each suspension member 4 is fixed to the deck 1 of the bridge, and the upper end thereof is fixed to the suspension cable 3 by a collar 13. Each collar 13 is bolted together around the suspension cable 3, for example 2
Two semi-cylindrical bushes 13a and 13b,
The upper end of the suspension member 4 is articulated to one of the two bushes 13a.

The wire 7 of the suspension cable 3 is included.
The jacket structure, on the outside of which the collars are attached, consists of independent outer coverings 9 of these strands, but is generated by fixing the respective collars, which transmit the loads received by the individual suspensions 4. The transmission of the crushing force to the strands 7 is prevented by the base formed by the cured filling product 12 and by the outer tube 10.

The tangential force generated because the suspension member 4 is not perpendicular to the suspension cable 3 is received by the jacket structure because its compressive strength acts in parallel with the direction of the suspension cable. By filling the material 12 such as cement grout or resin, the required compressive strength on the order of tens of MPa can be easily obtained. Alternatively, the material 12 may be a grout with an increased amount of resin.

In order to attach the suspension cable 3, the external tube 10 through which one group of independent protective wires 6 penetrates
You need to start with The metal wires 7 of the wire group 6 are fixed at both ends of the suspension cable 3. Then, another group of independent protective strands 6 is passed one after another by being pulled with the help of a shuttle sliding alternately in the tube 10 in the opposite direction. Each time a strand is passed, both ends are fixed. When all of the independent protective strands 6 have been passed and fixed, the filling product 12 is injected into the tube 10 from the lowest point of the path of the suspension cable 3. The injection is carried out at high points, i.e. under pressure, with vents in the fixing device attached to the tower 2 of the bridge. After the injected filling product 12 has hardened, the hanger 4 can be started to be connected by its collar 13.

The tensioned wire 7 of the suspension cable
Can be replaced individually without removing the collar 13, for example as follows. First, we start by welding the end of a new strand to the first end of the previously used strand 7 projecting from one of the fixed blocks. Next, the fixing jaw is removed from the first end of the wire 7 after recording the tension of the wire. This strand is relaxed. Next, against the second end of this strand 7 projecting from the opposite fixing block, the fixing jaws are withdrawn and the second end of the strand 7 is completely removed from this independent outer sheath 9. Pull out and replace with a new wire until it is removed. Next, the wire is pulled by a jack to increase the tension value and then fixed. The wire can be easily pulled out by the lubricant 8 in the independent outer coating 9. Lubricants such as grease are brought in as new strands are introduced into the outer jacket 9, which performs the function of penetration, protecting the new strands from corrosion and facilitating subsequent replacement. .

Thus, the wires 7 of the suspension cable 3
Can be exchanged in a simple manner without interrupting the normal traffic of the bridge.

FIG. 4 shows another example of the independent protection strand group 16 which can be used in the suspension device according to the present invention. The actual wire 7 is coated with a protective material 18 such as wax or grease, for example, as shown in FIG. It is surrounded by one coating 19. This first coating 1
Lubricant 20 such as grease exists between 9 and outer covering 21 of independent protective strand group 16.

The suspension cable 3 provided with the independent protective strand group 16 shown in FIG. 4 can be attached in the manner described above. In order to replace the wires, the outer sheath 21
While remaining in place in the substrate formed by the filling product 12, the strand 7, the protective material 18 and the first coating 19
Is replaced by a similar unit.

By using the group of independent protective strands 16 shown in FIG. 4, the metal wire of each strand that is attached in place of the previous strand is completely covered with a layer of protective material 18,
Unwanted particles can be protected from contacting these metal wires during the exchange operation.

FIG. 5 schematically shows the structure of another group of independent protective wires 24 that can be used in the device of the present invention. This strand group 2
The outer coating 25 of the fourth has bulges 26 at intervals in the direction along the suspension cable 3. The spaced bulges 26 are arranged so that when the independent protective strands 24 are placed in the outer tube 10 of the cable, they are offset longitudinally from one another. In this way,
Spacing is provided between the outer coatings 25 of these strands, which allows the injected filling product 12 to pass properly between all the independent protective strands 24 and to be harmonized after curing. Can form a solid base.

To ensure that the tangential force is transmitted from the collar to the jacket structure of the suspension cable 3, the collar 13 is gently tightened (this force is not transmitted to the wire 7 being pulled). The friction force may be used. At the longitudinal position of the collar where such a tangential force acts, the outer tube 1 of the cable 3
The advantage of the present invention can be obtained by providing a lateral undulation on the inner surface and / or outer surface of the zero. Very little or no force is required to tighten the collar in the radial direction.

An external tube 10 of this type is shown in FIGS. The tube 10 is comprised of a smooth section 30 extending between the collars and sections 40, 50 and 60 located within the collar 13. The sections 40, 50 and 60 are welded end-to-end to the smooth section 30. These sections are formed by casting during the manufacturing stage, while the smooth section 30 is conventionally made by extrusion.

In the example of FIG. 6, the outer surface of the tube section 40 has a circumferential spline 41 and the inner surface of the collar 13 has a corresponding spline 42 for engaging the tube 10, thereby providing a tangential force. To communicate.

In the example of FIG. 7, the wall of the tube section 50 has a bellows-like waveform, thereby forming lateral undulations 51, 52 on the inner and outer surfaces. The tangential force exerted by the collar 13 having a corresponding groove 53 on its inner surface is transmitted almost directly to the hardened filling material in the tube 10.

In the example of FIG. 8, the tube section 60 has a spline 61 on its inner surface, which transfers tangential force to the hardened filling material injected into the tube 10. An annular protrusion 62 is formed on the outer surface of the tube section 60, and an inner surface of the collar 13 is formed with an annular groove 63 which engages with the protrusion 62 to transmit a tangential force.

[0038]

As described above, in the method for manufacturing a structural cable for a construction structure according to the present invention, the cable manufactured by the method, and the independent protection element group used in the method, a plurality of independent protection elements are used. Since a passage is formed between the wires and the injected filling product completely fills the tube, sufficient compressive strength corresponding to the tangential force is obtained and direct contact between the wires can be prevented. effective.

The outer covering of each independent protective strand group is
This is because a plurality of bulges are provided at intervals along the direction of the cable, and the independent protective strands are arranged in the outer tube so that the bulges of the respective outer coatings are shifted from each other in the longitudinal direction. .

[Brief description of the drawings]

FIG. 1 is a general schematic diagram of a suspension bridge.

FIG. 2 is a cross-sectional view of a collar connecting a suspension cable and a suspension member of the suspension device according to the present invention.

FIG. 3 is a cross-sectional view of one example of a group of wires that can be used in the suspension device according to the present invention.

FIG. 4 is a cross-sectional view of another example of a group of wires that can be used in the suspension device according to the present invention.

FIG. 5 is a schematic side view of a group of wires that can be used in the suspension device according to the present invention.

FIG. 6 is a schematic longitudinal sectional view of an outer tube of a suspension cable usable in the suspension device according to the present invention.

FIG. 7 is a schematic longitudinal section of an outer tube of a suspension cable usable in a suspension device according to the invention.

FIG. 8 is a schematic longitudinal sectional view of an outer tube of a suspension cable usable in the suspension device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deck 2 Tower 3 Suspended cable 4 Hanging material 5 Anchor 6, 16, 24 Independent protective strand group 7 Actual strand 8 Lubricant material 9, 21, 25 Outer coating 10 Outer tube 12 Cured filling product 13 Collar 13a, 13b Bush 18 Protective material 19 First coating 20 Lubricant 26 Swelling 30 Smooth section 40, 50, 60 Tube section 41, 42, 61 Spline 51, 52 Undulation 53 Groove 62 Ring projection 63 Ring groove

Claims (9)

[Claims] 1. A group of independent protective strands (6, 16, 24) arranged in an outer tube (10) and a filling product (12).
Is injected into the outer tube to substantially fill the space around the outer sheath (9, 21, 25) of the group of independent protective strands, and the filling product is cured. The method for manufacturing a structural cable (3), wherein the outer sheath (25) of each of the independent protective strand groups (24).
Has a plurality of bulges (26) spaced along the direction of the cable, wherein the group of independent protective strands is such that the bulges of each of the outer sheaths are offset longitudinally from one another in the outer tube. A method for producing a structural cable for a construction structure, the method comprising: 2. The method according to claim 1, wherein a working force is applied to the cable after injection and curing of the filling product. 3. A method according to claim 1, wherein the filling product comprises at least one of cement grout, a polymer and a resin. 4. The outer sheath (9, 21, 25) of each independent protective strand group (9, 21, 25) is of high-density polyethylene. Of manufacturing a structural cable for a construction structure. 5. An outer tube (10) and a group of independent protective wires (6, 16, 24) contained in said outer tube.
And a cured-filled product (12) substantially filling the space around the outer sheath (9, 21, 25) of the group of independent protective strands in the outer tube. In the structural cable, the outer sheath (25) of each of the independent protective strand groups (24).
Have a plurality of bulges (26) spaced along the direction of the cable, wherein the group of independent protective strands is such that the bulges of each of the outer sheaths are longitudinally offset from one another in the outer tube. A structural cable for a construction structure, wherein the cable is arranged in a building. 6. Structural cable for a construction structure according to claim 5, wherein the filling product (12) comprises one or more of cement grout, polymer and resin. 7. The construction structure according to claim 5, wherein the outer covering (9, 21, 25) of each independent protective strand group (6, 16, 24) is high-density polyethylene. Structural cable 8. At least one suspension cable (3)
A suspension bridge comprising: a deck (1); and a suspension member (4) for connecting the deck to the suspension cable. The suspension cable according to any one of claims 5 to 7,
A suspension bridge, which is the structural cable according to the paragraph. 9. An independent protective strand group used in the method of manufacturing a structural cable for a construction structure according to claim 1, wherein the independent protective strand group is externally covered. (9, 21, 25) having at least one metal wire (7) contained therein and an outer sheath (25) comprising a wire group (24)
A group of independent protective strands having a plurality of bulges (26) spaced apart along the direction of (1) and used in a method of manufacturing a structural cable for a construction structure.