DE1658578A1 - Suspension bridge cable anchoring - Google Patents

Description

-I ^ ₃ . ν / ΐιηοΙη RoiGhel.

Frankfurt / Main-l

Parksirc Ute 13 '

5447

Bethlehem Steel Corporation, Bethlehem, Pennsylvania, USA

Suspension bridge cable anchoring -. ..

The invention "relates to simplified, powerful and economical anchoring for prefabricated wire strands in suspension bridge cable.

Previously included suspension bridge anchors for prefabricated Strands of wire usually partially embedded in concrete Components, with the wire strands attached to the protruding sections of these components in various ways became. Typical anchorages of this type are those in the U.S. Patents 1 «526f: 3 and 2,178,147 shown. Although it has been found that these anchorages You have to fix or anchor the cable sufficiently but certain disadvantages. The metallic anchoring rails used in these stretch under load and there is a tendency towards progressive separation or Breaking the connection with the concrete present at the entry point of the rail into the concrete at the front Side starts and works towards the back of the anchorage. This causes the concrete to crack and the like Cracks in the front of the anchorage form water intr ittsstelleri. To overcome these shortcomings the pre-tensioned anchorage was developed and used. Although such anchors are powerful, they are they as a result of the complicated pre-tensioning lines and processes, the complicated tensioning joint mechanisms at the front

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on the part of the anchorage and for other important reasons considerably more expensive.

Attempts have been made to produce a simpler anchorage for construction cables in which the cable passed through an opening in an anchoring block and attached to the back of the block. A specialized embodiment of such an anchoring arrangement is shown in US Pat. No. 2,914,783. However, such anchoring is not entirely satisfactory, as they do not distribute the load uniformly over the entire anchoring concrete, and depending on the specific Execution difficulties can also arise as a result of a poor connection between the ironworks and the concrete.

The invention is therefore based on the object to provide a simplified bridge cable anchorage that the Load is evenly distributed over the entire anchorage and maintains the integrity of the concrete as well as at the same time is cheaper, easier and faster to manufacture than the previously known anchors.

According to the invention, the above object can be achieved by providing a rigid prefabricated assembly comprising a number of hollow cylindrical bodies attached at their lower ends to a heavy bearing plate which in turn have through openings aligned with the cylindrical bodies comprises that this arrangement is embedded in a concrete anchoring block, the ends of the wire strands to be anchored being passed through the openings in the anchoring block which are formed by the hollow cylindrical bodies, and that the strand end fittings against the bearing

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plate next to the lower end of each cylindrical Body so put on by suitable devices or applied v / earth that the tension in the wire is brought to the bearing plate and as a pressure force uniformly in the Anchoring concrete is transferred.

The invention will now also be made with reference to the accompanying figures described in detail, with all details emerging from the description and the figures or Features contribute to the solution of the problem within the meaning of the invention can and were included in the application with the will to be patented. It show: W

Pig. 1 shows a sectional view of a bridge anchorage according to FIG the invention.

Pig. 2 shows a detailed longitudinal section through the embedded Part of in Pig. 1 anchoring shown.

Pig. 3 is an end view along the embedded portion the line 3-3 of the Pig. 2.

Pig. 4 and 5 corresponding side views of an upper and lower section of an anchoring arrangement before embedding.

Pig. 6 and 7 corresponding cross sections along the lines 6-6 and 7-7 the Pig. 4 and 5,

Pig. 8 is a detailed view of the support end of part of FIG Anchoring arrangement.

Pig. Figure 9 is a sectional view of the anchor pad assembly according to the invention along line 9-9 of Pig. 8 and

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Fig. 10 shows a detail of the spreading end of a section the anchoring arrangement.

Referring now to the drawings, as shown in Figure 1, a suspension bridge cable 11 is run which is formed from a number of prefabricated strands, which strands are either the well-known helical wire strands or the more modern ones in the factory ^vorgefe>] Untitled-en körinen order parallel wire strands through a Verankerungsauflager 13, ^r to a part 1;> of Brüokenbauwerks is supported "From this support 13, the individual train components 17 -erstrecken under predetermined spread angles apart to the anchoring block 19 down. The anchoring block 19 can consist of part of the anchoring foundation 21 of the bridge. Hollow anchoring cylinders are embedded in the anchoring block 19 to form tubular openings that run from one end of the anchoring block 19 to the other _o - The strands 17 extend through the anchoring cylinders 23 and connecting sleeves or cable catchers 25 at the ends of the strands lie on a heavy one Bearing plate 27, which is fixedly attached to the rear of the anchoring cylinder 23 and partially embedded in the anchoring block 19. Reference is now made to FIG. The tensile stress: in the strands 17 is transmitted as pressure via Be i lagsche i'ben P ^ and a bearing arrangement 31 into the bearing plate 27 and further into the anchoring cylinder 23, and these components then transfer the strand forces to or into the concrete of the anchoring block 19th

The anchoring cylinders 23 are not only attached to the bearing plate 27, but also to a perforated plate 4b embedded in the middle and a front perforated plate b ^ j which, together with the bearing plate 27, makes the entire factory

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Asked arrangement to connect to a rigid structural unit. (See Figures 3, 4- and 5). Other suitable components can be added attached to the anchoring cylinders if necessary is to bring them together to form a unit, either in addition to or instead of the plates 53 and 56. It is important, however, that the bearing or platen 27 be present to support the initial bearing forces of the strands to be transferred uniformly to the back of the anchoring concrete and to the anchoring cylinders 23. Various devices engaging the concrete can, if necessary, be welded to the anchoring cylinder or as an integral part of the outer surfaces thereof be provided to improve the locking of the cylinders and the assembly as a whole with the concrete of the anchorage. For example, metal pins, such as those that are sometimes welded to bridge girders, can be used to interlock with To form adjacent concrete slabs, are welded to the outer surfaces of the anchoring cylinder 23 to a to create additional interference in the concrete of the anchorage. '.

From Pig. 2, which is a detail of the anchoring arrangement .Shows, it can be seen that the end fittings or sleeves 25 by slotted washers 29 at a distance are arranged by the bearing plate 27, and that this Washers are placed on the support arrangement 31, w.e in detail in the Pig. ^;. ,, and 9 is shown. The support order 31 is made of two halves 33 and 35, each of which has a flat plate 39, the each contain a cut-out section which again, if they are arranged around the strand 17, such as in Pig. 9-9, form a mating round hole 40 through which the strand passes. On every plate

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is one half of a tubular member 37 concentric attached to hole 40, -;

The strands 17 normally have end connection sleeves 25 which consist of any suitable design, such as cast zinc sleeves, which are already attached at the ends before they are transported to the bridge location '. When the strands 17 are hung or mounted, the ends with the connecting sleeves 25 are through the anchoring cylinder 23 pulled through, the two halves 33 and 35 of the support assembly 31 are wrapped around each strand 17 and each assembly is placed against the bearing plate 27 with the small tubular members 37 inside the bearing plate opening can be arranged. An insertion piece 43 made of nylon, zinc, or other suitable material is inserted into the opposite or upper end of the anchoring cylinder 23 and adjusted radially so that that it supports the strands 17 and leads against the spreading point on the anchoring support 13.

After the full self-loading "of the bridge" arises or is present and the strands are fully tensioned, a plug or stopper 45 is made of a suitable sealing material, about Gusami, cast or inserted near the upper end of the anchoring cylinder 23 and a filling made of a moisture repellant material such as chloride free Cement paste, or plastic foam, is used in the Anchoring cylinder 23 through feed pipes 4b and taps 4 ^ B pressed in to form a seal around the strands 17 to accomplish. The plug 45 restricts the flow of the filling 47 at the top of the anchorage Skylirider Finally, a special sealing plug 41 made of rubber or another suitable sealing material at the top of the anchoring cylinder, which prevents any water from entering.

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4 to 7 show an anchoring arrangement before these embedded in the anchoring block 19; will, this Arrangement, can be factory made in sections such as the two halves 49 and 51 to make them convenient can be transported and set up. The anchoring cylinders 23 in both sections are on heavy bearing plate sections 27A "or 27B at one end by means of weld threads 28 and to perforated plate sections 53A and 53B secured at the other end by welds 54, with a small part of the anchoring cylinder 23 through the plates 53A and 53B protrudes through so that any moisture can subsequently penetrate along the front of the anchoring housing runs downwards, is deflected by the strands in the completed arrangement, reinforcing webs 55 are welded between the anchoring cylinders 23 to give the entire arrangement an additional rigidity ability to lend. There may also be one or more intermediate perforated plate sections 56A and 56B passing through Weldings 52 attached to the cylinders 25 are used for this purpose become, the arrangement parts, an additional rigidity to rent.

The assembly half 51 has three I-beams or support members 57; ^: e attached to it to provide fastening means to allow the assembly half to be supported on racks 59 (as shown in Figure 1) before the concrete for the anchoring block 19 is poured. Holes 60 for lifting the assemblies are provided in panels 27A and 27B, 53A and 53B, which can be reinforced with panels 5 'if necessary. The bearing plates 27A and 27B and perforated plates. 53A and 53B are expediently used as partial concrete forms for the anchoring block 19 during its formation.

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■ Connection plates 62, which are attached to the upper part of the bearing plate section 27B are attached form a fastening device between the plate sections 27A and 27B after assembly at the bridge place. Stiffened bearing and connecting angles 63 and 64 form a bearing surface and Fastening devices between the perforated plates 53A and 53B. Aligned screw holes not shown in the angle parts 63 and 64 facilitate the connection of the Arrangements. A narrow support rail 65 on the top the interposed perforated plate 56B forms a support for the perforated plate 56A on top of it the installation at the bridge location. Sometimes it may be desirable to use the two halves 49 and 5 t of the anchoring assembly to be welded together securely at the bridge location in order to obtain a rigid, unified whole.

The entire anchorage is usually in a weatherproof housing 61 enclosed as shown in dot-dash lines in Pig, 1, with a seal cover 66 is provided to prevent water from entering the anchorage.

If a larger anchoring block 19 and anchoring arrangements 49 and 51 allow it, the anchoring bodies 23 can also be in a position parallel to one another instead of be installed in a divergent position, at the same angle as the splay angle of the corresponding Strands 17 running through them. In this case, the introductions 43 »which represent a change in the Cause directional course of the strands, be omitted, and the strands 17 can be in a straight line from the splitting point or the anchoring support to a curved one or stepped support surface on the back

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the anchorage and this area should be suitable be provided with a support plate device, UD to transfer the tensile stress into the concrete »

The arrangement according to the invention creates an economical and practical bridge anchoring at the tension of the suspended strands in a direct Transferring compressive force to the back of the anchorage and evenly across the anchorage block •. Is given to the strength and safety of a prestressed to ensure embedded anchoring design or obtainable, but without the expense and complications of such an arrangement.

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Claims (6)

Claims; 1. Prefabricated anchoring arrangement for embedding in a concrete anchor block of a bridge, marked by a perforated Bearing plate (27) which is designed so that it rests on a lower surface of the anchoring block (19), a Number of hollow cylindrical parts (23) arranged side by side and in alignment on the bearing plate (27) are firmly attached to the openings therein, a load-bearing and embedded structure (55), which is attached to the cylindrical parts is fixed between their ends and by a perforated support plate (53) which is fixedly attached to the upper ends of the cylindrical parts (23). 2. Anchoring arrangement for bridge cable strands of a suspension bridge according to claim 1. characterized that the number of hollow cylindrical, juxtaposed parts (23) in a concrete anchoring block (19) is embedded at one end of the bridge width that the perforated bearing plate (27) at one end of the Concrete anchoring block (19) is attached that the end portions of the cylindrical parts (23) on the bearing plate (27) in alignment with the openings in the bearing plate (27), that there are a number of bridge cable strands (17) extends through the cylindrical parts (23), and that Support devices (25) are attached to the ends of the bridge cable strands (17) and on the bearing plate (27) rest. 3. Anchoring arrangement according to claim 2, characterized g e k e η η ze i c h η e t that the support devices (25), -the = are attached to the ends of the strands (17), have a number of sleeves. 0098A370 799 BATH ORIGINAL 4. Verankerraigsanordnung according to one or more of the preceding Claims, characterized in that the cylindrical hollow parts (23) in one are arranged fairly parallel position and at the upper end of each hollow part (23) an introduction (43) on the Inside each bend of the strand is provided which leaves the hollow part (23), whereby the strand becomes one Spreading point (13) is performed at which the strands (17) are brought together to form a bridge suspension cable, that consists of these strands. 5. Verankerraigsanordnung according to claim 1 or 2, characterized in that the cylindrical parts (23) arranged at angles diverging from the top to the bottom relative to one another which correspond pretty much to the splay angles of the prefabricated strands at the splay point of a suspension bridge cable, that consists of these strands. 6. Anchoring arrangement according to one or more of the preceding claims, characterized in that the cylindrical ropes (23) by means of a plug (45) ₉ which surrounds the strand at the upper end of the cylindrical part (23) and a solidified waste material V (47 ) are made weatherproof in the rest of the gate of the cylindrical part. 009843/0799 r ⁴ * Empty soap