EP1411185A1 - Method to retrofit concrete masts - Google Patents

Abstract

Two or more longitudinal profiles (2) are bonded (3) along the surfaces of the concrete mast (1). Transverse bridges, especially clamping straps (4) are connected to the profiles, over the interspaces between them. Transverse rods or sheets with fixing holes are alternatively employed.

Description

The invention relates to a method for subsequent Retrofitting of concrete poles - training means on the one hand a subsequent reinforcement of the concrete mast, the For example, it is appropriate if the concrete mast higher Stresses is exposed. It should expediently the mast loadability both in terms of bending (relative to the mast longitudinal axis) as well as torsion increase. Training means within the scope of the invention on the other hand a renovation of damaged concrete pylons. The inventive method is preferably for subsequent upgrading of concrete poles for middle and High voltage cables used.

The well-known from practice concrete masts have in the Usually steel reinforcements, for example in the form of a Reinforcement basket on. The steel reinforcement takes over in the Operating tensile stresses and the concrete of the mast absorbs the compressive stresses that occur during operation. When Loads of concrete masts occur in particular bending stresses on the one hand in the cable direction Differential cables on the other hand across to Cable direction through to the mast and the conductor cables acting wind up. If subsequently to already existing concrete poles made higher demands be, for example due to larger cable cross-sections or higher external mechanical loads, Like wind loads, it is necessary to use the concrete poles subsequently to reinforce or strengthen. At a Medium or high voltage line usually has a Variety of concrete pylons to be upgraded. So one economic feasibility is possible, the Retrofit on the spot swiftly and preferably without prior exact measurement of each individual Concrete mast be possible.

The invention is based on the technical problem, a Specify method of the type mentioned, with the on simple and timely way an effective and at the same time economic upgrading of concrete pylons is possible.

To solve this technical problem, the invention teaches a method for retrofitting concrete pylons,
wherein at least two longitudinal profiles are glued with the interposition of at least one adhesive with the proviso on the concrete mast surface, that the longitudinal profiles are oriented in the longitudinal direction of the concrete mast
and wherein adjoining the longitudinal profiles at least one bridging the gap between the longitudinal profiles cross member.

According to a preferred embodiment of the invention is with Longitudinal profiles of steel and / or of a fiber-reinforced Plastic worked. Before gluing the longitudinal profiles the concrete mast surface is expediently cleaned, in particular by mechanical blasting, such as sandblasting and / or water jets. Then the glue is on applied the cleaned concrete mast surface. It is located in Frame of the invention that the adhesive is made of a synthetic resin, in particular consists of an epoxy resin. After preferred Embodiment of the invention is provided with an adhesive Epoxy resin base and preferably with an epoxy resin mortar worked as an adhesive. Appropriately, it is with the glue around a thixotropic substance. After a Embodiment of the method according to the invention is the Concrete mast with a vibrating device with the proviso Edits that the glue is between longitudinal profile and Concrete mast surface evenly distributed, so that the Longitudinal profile then with the interposition of Adhesive fits snugly against the concrete mast. Preferably while the longitudinal profile, which rests on the adhesive, with the Vibrating device acted upon.

That the longitudinal profiles in the longitudinal direction of the concrete mast be oriented, means within the scope of the invention in particular, that the longitudinal profiles in their glued Condition parallel to the longitudinal axis of the concrete mast or at least substantially parallel to the longitudinal axis of the Concrete mast are arranged. Appropriately, is with a plurality of longitudinal profiles worked over the Scope of the concrete mast to be distributed. So can For example, a plurality of longitudinal profiles over the Scope of a round concrete round cross-section distributed be, with the longitudinal profiles preferably the same Have distances from each other.

After a very preferred embodiment of the invention Procedure will be attached to a polygonal concrete mast at least two Mastecken, preferably at each Mastecke respectively at least one longitudinal profile, preferably an angular Longitudinal profile glued on. Basically, the longitudinal profiles also in the form of flat iron at the Mastecken be glued. Preferably, this is Longitudinal profile but an angle profile, with a mastecke as it were covered. It is within the scope of the invention that at a mast corner of the concrete mast several longitudinal profiles be arranged one above the other along the concrete mast. at a rectangular concrete mast are preferably Longitudinal profiles provided on all four masts. For Medium and high voltage lines are among others Concrete masts with a double T-section usual. Appropriately, longitudinal profiles are in these concrete poles glued to all four outer Mastecken.

It is within the scope of the invention that a plurality of Longitudinal profiles is arranged vertically one above the other, so that there are several longitudinal profiles arranged next to each other extend the concrete mast. If the concrete mast for example has a height of 30 m, can have five longitudinal profiles, the each have a length of 6 m, for example, along a Mastecke the concrete mast glued on each other become. Preferably, two superimposed Longitudinal profiles connected or together attached. Appropriately, this are fasteners fixed at the ends of the longitudinal profiles. After preferred Embodiment will be at the ends of these longitudinal profiles Bolts, in particular threaded bolts as fastening elements welded. These bolts or threaded bolts can on easy and quick way with a stud welder be welded to the longitudinal profile ends. The one above the other arranged longitudinal profiles are preferably using Lugs connected, which have mounting holes. The Fastening openings are at the Längsprofilenden assigned to fixed fasteners and in Connected state by the fasteners, in particular the bolts or threaded bolts the Mounting openings of the tabs. Basically it is in the context of the invention, that bolt or threaded bolt first preferably with a stud welder to the Längsprofilenden be welded and only then the Lugs are applied with the proviso that the bolts or threaded bolt the mounting holes of the tabs by grasp. In a preferred embodiment a tab first to connect to the two Longitudinal profiling and then be through the Mounting holes the bolts or threaded bolts on the Longitudinal profile ends welded. If welded on Threaded bolts are present on the longitudinal profile ends, can then screwing on corresponding nuts respectively. - The longitudinal profiles adhered according to the invention can very effectively control the bending load capacity of the Reinforce concrete mast.

According to a very preferred embodiment of the invention is at least a strap as a cross member to the Concrete mast with the glued longitudinal profiles wound and then excited. It is within the scope of the invention that a tension band is flexible or flexible. A strap is suitably made of metal, preferably made of stainless steel. But it can also tension bands in the form of galvanized or coated profile strips be used. The tensioning of a tension band takes place with a suitable clamping device. When clamping is the tension band expediently tight to the concrete pole dressed. The tensioned straps press the under arranged longitudinal profiles as it were against the Concrete pole. These tension straps can be effective Absorb tensile forces and the torsional resistance moments of the Effectively increase concrete mast. According to one embodiment of the Invention is a strap horizontally or in Essentially wrapped horizontally around the concrete pole. The Tension band is then orthogonal or essentially arranged orthogonal to the longitudinal profiles. Horizontal For example, oriented straps can be used in one Vertical distance of 1 to 2 meters on a concrete pole be provided. - That a strap as a cross element to the concrete mast is wound, means within the scope of the invention Preferably, that the strap at least once around the entire circumference of the concrete mast is wound. This is but not mandatory. A strap can be in the context of the invention also only a part of Extend circumference of the concrete mast.

According to a very preferred embodiment of the According to the invention, a tension band is helical wrapped around the concrete pole. The two ends be this helically wound tension band fixed to the concrete mast or to the longitudinal profiles. It is within the scope of the invention, that at least a first Tensioning tape wrapped helically around the concrete mast and that at least a second strap with in Compared to the first tension band opposite Direction of rotation wrapped helically around the concrete mast becomes. In this way, an effective reinforcement of the Concrete mast with respect to torsional load in two directions reached.

It is within the scope of the invention that a strap to the Longitudinal profiles is attached. Preferably, a Strap on several longitudinal profiles and preferably at all Longitudinal profiles that cover it, attached. The attachment can basically by gluing and / or welding and / or soldering and / or screwing and / or Riveting done. According to a very preferred embodiment has the strap on mounting holes and is the Tensioning strap with the attachment holes through Fasteners attached to a longitudinal profile. Appropriately, the fasteners through the Mounting holes of the already on the longitudinal profile resting tensioning strap fixed to the longitudinal profile, preferably welded. In a fastener it is preferably a simple bolt (cylindrical pin) or around a threaded bolt or around a mushroom-headed bolt. Preferably, the Fasteners with a stud welder to the Longitudinal profiles welded on. This welding has become proven and can be done in a simple and timely manner. With simple bolts, at least one lateral movement of the Tension band can be prevented. When the fastener is a threaded bolt, the strap can also be radial be fixed, for example, by screwing a nut becomes. Even a mushroom bolt causes such radial fixation of the tension band. After very much preferred Embodiment of the invention is the distance of Mounting holes in the tension band lower than that Width of a longitudinal profile to which the strap attached shall be. - Basically it is also within the framework of Invention, the strap with the help of weft nails, the with a suitable firing device in strap and longitudinal profile be driven to fasten.

According to another very preferred embodiment of Invention are at least two longitudinal profiles by at least one connecting rod, preferably by a diagonally arranged connecting rod as a cross element connected with each other. This is a connection bar expediently to a rigid linear or in the Substantially linear rod-shaped or bar-shaped Profile. Diagonally arranged means within the scope of the invention, that the connecting rod with respect to the concrete mast longitudinal axis is arranged obliquely or diagonally. Conveniently, connects a connecting rod two at the mast corners arranged longitudinal profiles. For rectangular or polygonal Concrete poles can be used to absorb the torsional moments Longitudinal profiles so by diagonal connecting rods be connected to each other. It should be emphasized that the diagonal connecting rods in addition to tensile forces in particular can absorb pressure forces. In that regard, the effect Diagonal connecting rods on a concrete mast, as it were as pressure rods that can absorb pressure forces effectively. The connecting rods can be used as an alternative to a Tensioning band or be provided to tension bands. It lies but also in the context of the invention that a connecting rod or connecting rods with a tension band or tension bands can be combined.

According to a preferred embodiment, a connecting rod Mounting holes on and this connecting rod with the attachment openings by cross-fasteners attached to a longitudinal profile. in principle it is within the scope of the invention that the first Fasteners are attached to the longitudinal profiles, be welded in particular and then a Connecting rod is applied with the proviso that the Fasteners the mounting holes of the Pass through the connecting rod. It is also in the Frame of the invention that the fasteners by the mounting holes of the already launched Connecting rod fixed on the longitudinal profiles, preferably be welded. In a fastener for the Fixing a connecting rod is expediently to a simple bolt or a Threaded bolt or a mushroom bolt. After a lot preferred embodiment, the fasteners with a stud welder on the longitudinal profiles welded on and this is a very easy and quick Operation possible.

According to another preferred embodiment of the Invention be two longitudinal profiles by at least one connecting plate connected as a cross element. These Connecting plates are preferably on Längsprofilen fixed to concrete poles with double-T shaped Cross-section are glued. These concrete masts point usually window-like, distributed over their height Openings and the connecting plates are expediently directly below these openings on the concrete mast or fixed to the longitudinal profiles. A connecting plate is preferably rectangular in shape and is preferably the fifth up to 30 cm, especially 10 to 20 cm high (in mounted Condition with respect to the vertical height of the concrete mast). It is within the scope of the invention that a connecting plate Has mounting holes and that the Connecting plate with the mounting holes sweeping fasteners on a longitudinal profile is attached. Preferably, a connection plate as well as a connecting rod described above with a Longitudinal profile connected. In that regard, can on the above Explanation of the connection of a connecting rod with a longitudinal profile be referenced. - The invention Connecting plates contribute effectively Increase or increase the torsional rigidity of the concrete mast effectively the torsional resistance moment of the concrete mast.

The invention is based on the finding that with the inventive method is a very effective and at the same time functionally reliable retrofitting or later Reinforcement of concrete poles is possible. The invention Procedural measures are simple and few consuming feasible. With the procedure, a relative high number of concrete poles quickly and thus cost-effectively or be economically viable. To emphasize is in particular, that elaborate exact surveying not for the implementation of the method according to the invention required are.

Fig. 1

eine Seitenansicht eines mit dem erfindungsgemäßen Verfahren ertüchtigten Betonmastes in einer ersten Ausführungsform,

Fig. 2

einen Schnitt durch den Gegenstand nach Fig. 1,

Fig. 3

den Gegenstand gemäß Fig. 1 in einer zweiten Ausführungsform,

Fig. 4

einen Schnitt durch den Gegenstand nach Fig. 3,

Fig. 5

einen Schnitt durch den Gegenstand nach Fig. 1 im Bereich der Längsprofile

Fig. 6

einen vergrößerten Ausschnitt aus Fig. 3 in perspektivischer Darstellung und

Fig. 7

den Gegenstand nach Fig. 1 in einer weiteren Ausführungsform.

The invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. In a schematic representation:

Fig. 1

a side view of an improved with the inventive method concrete mast in a first embodiment,

Fig. 2

a section through the article of FIG. 1,

Fig. 3

the article according to FIG. 1 in a second embodiment,

Fig. 4

a section through the article of FIG. 3,

Fig. 5

a section through the article of FIG. 1 in the region of the longitudinal profiles

Fig. 6

an enlarged section of FIG. 3 in a perspective view and

Fig. 7

the article of Fig. 1 in a further embodiment.

The figures show a with the inventive Procedures upgraded concrete mast 1. To be upgraded Longitudinal profiles 2 with the interposition of an adhesive 3 the concrete mast surface has been glued on. The longitudinal profiles 2 are oriented in the longitudinal direction of the concrete mast 1 and extend either parallel or substantially parallel to the longitudinal axis of the concrete mast 1. To the longitudinal profiles 2 are the space between the longitudinal profiles 2 bridging and described in more detail below cross elements connected. The longitudinal profiles 2 exist in the embodiment from steel.

Fig. 1 and 2 show a round in cross-section or circular concrete mast 1. Here are flat bars as Longitudinal profiles distributed over the circumference of the concrete mast 1 arranged or glued to the concrete mast surface Service. The longitudinal profiles 2 are here at equal intervals arranged from each other. In the embodiment of FIG. 1 are clamping bands 4 as cross members to the concrete mast 1 with the glued longitudinal profiles 2 wound and stretched Service. The tension bands 4 are thus on the longitudinal profiles 2 and press the longitudinal profiles 2 as it were on the Concrete pole surface. Preferably and in the embodiment it is in the tension bands 4 to flexible or flexible bands made of stainless steel. In the upper area of the Concrete mast 1 in Fig. 1 is first a first strap 4th recognizable, the horizontal around the entire circumference of the Concrete mast 1 is wound and thus orthogonal to the Longitudinal profiles 2 is arranged. There are also two more Tension bands 4 recognizable, the helical around the Concrete mast 1 are wound and although with opposite Rotation. In the enlarged section of Fig. 1 is recognizable that the clamping bands 4 on the longitudinal profiles. 2 are fixed and that preferably and in the embodiment with a threaded bolt 5, which on the Longitudinal profile 2 was welded. The threaded bolt 5 passes through a mounting hole 6 and on the Threaded bolt 5 was in the embodiment a nut. 7 screwed.

Figs. 3 and 4 show a concrete mast 1 with Double T-shaped cross-section (Fig. 4). Here are as Angle profiles trained longitudinal profiles 2 at the four outer Mastecken 13 of the concrete mast 1 glued. At every Mastecke 13 were several longitudinal profiles 2 on top of each other arranged (Fig. 3). The one above the other arranged Longitudinal profiles 2 are by means of tabs 8 together connected. This shows in particular the enlarged Section in Fig. 6. For the preparation of this compound be at the ends of the longitudinal profiles 2 threaded bolt. 5 expediently welded with a stud welder. This attachment of the threaded bolt 5 can so be carried out that the welding on already on the longitudinal profiles 2 applied tab 8 through the Mounting openings 9 of the tab 8 takes place. Subsequently can then attach nuts 7 to the threaded bolts 5 are screwed. In Fig. 6 it can be seen that preferably and in the embodiment at a angular longitudinal profile 2 both angled surfaces of the longitudinal profile 2 each connected to a tab 8 become.

In Fig. 3 it can be seen that the concrete mast 1 with Double T-shaped cross section tapers towards the top. Consequently, the longitudinal profiles 2 are not exactly parallel to Longitudinal axis of the concrete mast 1 is arranged. In the upper area of the concrete mast of Fig. 3 are two clamping bands 4 as Cross elements around the concrete mast 1 with the glued Longitudinal profiles 2 wound and these straps 4 are with Have been tightened a suitable clamping device. Both Tensioning bands 4 are helical around the concrete mast 1 wound and in the opposite direction of rotation. In that lower portion of the concrete mast 1 shown in FIG are the longitudinal profiles 2 by diagonal rigid connecting rods 10 interconnected. These Connecting rods 10 act as a kind of pressure rods or In addition to tensile forces in particular also compressive forces take up. In Fig. 3, each connecting rod 10 connects two longitudinal profiles 2 with each other. The connecting rods 10 are expediently as the tension bands 4 to the Longitudinal profiles 2 attached. Preferably, therefore Fasteners, in particular threaded bolt 5 to the Longitudinal profiles 2 fixed, in particular welded. The Connecting rods 10 have corresponding mounting holes 6, which of the fasteners or Threaded bolt 5 in the attached state of a connecting rod 10 be passed. Also a connection rod 10 can be fixed by screwing a nut 7.

Fig. 5 shows an average of three ways of attachment a tension band 4 on a longitudinal profile 2. In the upper Area of Fig. 5 is the clamping band 4 by means of a Mushroom head bolt 11 attached to the longitudinal profile 2. Conveniently, this mushroom head pin 11 in already on the longitudinal profile 2 launched state of the clamping band. 4 through a mounting opening 6 of the clamping band 4 on the Longitudinal profile 2 welded. - In the middle area that is Tensioning strap 4 with a simple cylindrical bolt fixed without thread on the longitudinal profile 2. This too simple cylindrical bolt 12 can in the way of Welding through the mounting hole 6 on the Longitudinal profile 2 are attached. The simple bolt 12 secures the tension band 4 substantially against a lateral displacement. - In the lower part of FIG. 5 is the strap with the help of a threaded bolt. 5 attached. This threaded bolt 5 was suitably with the strap 4 on by the attachment opening. 6 welded to the longitudinal profile 2. Subsequently, to the Fixierung of the clamping band 4 a nut 7 on the Threaded bolt 5 has been screwed. - For welding the aforementioned fasteners or bolts is very preferably a stud welder used with the in Within the scope of the method according to the invention a very simple and rapid installation of the elements is possible.

Fig. 7 shows a side view of a concrete mast 1 with double T-shaped cross-section. Here are the longitudinal profiles 2 by connecting plates 14 as transverse elements with each other connected. The connecting plates 14 are preferably and formed in the embodiment rectangular and expediently orthogonal to the longitudinal profiles 2 arranged. It is within the scope of the invention that the Connecting plates 14 directly below not closer shown window-like openings of the concrete mast. 1 are arranged. The connecting plates have attachment openings 6 and are with the mounting holes. 6 sweeping fasteners on the longitudinal profiles 2 attached. In that regard, the connecting plates 14 analogous to the connecting rods 10 and the tension bands 4 fixed to the longitudinal profiles 2 and it can on the above Referred to. The connection plates 14 contribute effectively to the torsional rigidity of the concrete mast 1 at.

Claims (12)

Method for retrofitting concrete pylons (1),
wherein at least two longitudinal profiles (2) with the interposition of at least one adhesive (3) are adhered to the proviso on the concrete mast surface, that the longitudinal profiles (2) in the longitudinal direction of the concrete mast (1) are oriented
and wherein on the longitudinal profiles (2) at least one of the intermediate space between the longitudinal profiles (2) bridging transverse element connects. Method according to claim 1, wherein longitudinal profiles (2) made of steel and / or fiber-reinforced plastic is working. Method according to one of claims 1 or 2, wherein with an adhesive (3) based on epoxy resin, preferably with an epoxy resin mortar is worked. Method according to one of claims 1 to 3, wherein at a polygonal concrete mast (1) on at least two Mastecken (13), preferably at each Mastecke (13) in each case at least a longitudinal profile (2), preferably an angular longitudinal profile (2) is glued on. Method according to one of claims 1 to 4, wherein at least one tension band (4) as a cross member around the Concrete mast (1) with the glued longitudinal profiles (2) is wound and stretched. Method according to claim 5, wherein the tension band (4) helically wound around the concrete mast (1). Method according to one of claims 5 or 6, wherein a Clamping band (4) is attached to the longitudinal profiles (2). Method according to claim 7, wherein the tension band (4) has fastening openings (6) and wherein the tension band (4) with the attachment openings (6) by cross-fasteners attached to a longitudinal profile (2) becomes. Method according to one of claims 1 to 8, wherein two Longitudinal profiles (2) by at least one connecting rod (10), preferably through a diagonally arranged connecting rod (10) interconnected as a cross member become. The method of claim 9, wherein a connecting rod (10) has mounting holes and wherein the connecting rod (10) with the mounting holes by cross Fastening elements on a longitudinal profile (2) is attached. Method according to one of claims 1 to 10, wherein two Longitudinal profiles (2) by at least one connecting plate (14) be connected together as a cross element. The method of claim 11, wherein a connecting plate (14) has fastening openings and wherein the connecting plate (14) with the mounting holes by cross Fastening elements on a longitudinal profile (2) is attached.

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