DE102009022540A1 - Method for re-hardening of dual-T-profile, which is utilized for anchoring tower of wind energy system, involves awaiting hardening time of filling agent, and releasing anchor element by retaining forces after lapse of hardening time - Google Patents

Abstract

The method involves lifting out of an anchor element (1) from a lower tolerance end position using a press (5) i.e. hydraulic press, and holding the anchor element in the position. A hollow space (3) is filled with a filling agent, which comprises a synthetic resin via an injection method. A hardening time of the filling agent is awaited, and the anchor element is released by retaining forces after lapse of the hardening time of the filling agent. The anchor element is pressed against contact surfaces that define the tolerance end position.

Description

The The invention relates to a method for solidifying anchor elements embedded in a concrete body.

In Many applications are in foundations or other concrete elements Anchor elements, preferably made of steel, via which the loads of, in particular, steel structures, such as masts, or machines. Especially in dynamic Loads such as vibrations in masts or vibrations in machines there is a possibility that loosen such anchor elements. Especially with strongly changing Loads, as for example in pylons of wind turbines or Antenna masts due to wind loads is the case, this is Process through the alternating introduction of compressive and tensile loads through the pylons at the foot Tipping moment and by the additional favored by the rotor induced vibrations. Mechanical load peaks occur especially when, when exceeding the permissible wind speeds the rotors are braked. With the beginning of the easing arises a movement of the anchor element between the forming End positions, whereby the joint formation and thus the relaxation further progresses. In similar Way, this is on anchor element designs of machinery and Installations transferable. The relative mobility of the anchor element to the concrete body can also damage the sealing systems, so that corrosion is possible by penetrating water. In addition, by the "pumping movements" by means of of standing in the joints then additional leaching and corrosion favored with cavitation and cracking. In the sequence progresses the process progresses faster and faster, which ultimately improves stability the wind turbines or other masts is endangered.

Out the prior art it is known cracking in concrete elements, especially in concrete including To seal reinforced concrete foundations by pressing with synthetic resin and that way over the gluing effect creates a traction caused by the cracking to restore separate concrete element parts. This will be at the same time a protection against the further penetration of water and before progressive Corrosion allows. In the same way it is known in the art, joints and other cavitations between the concrete element and therein reclose recessed anchor elements.

In As is known, such a Kunstharzinjektionsverfahren so carried out, that first after any required crack detection, injection holes are set, which reaches the crack planes or other cavities or pierced. There may be necessary pre-treatments such as the introduction of bonding agents or the implementation of Temperierungsmaßnahmen carried out and the injection wells are provided with injection packers. About these then the resin is pressed and after the most complete filling the cavities with overpressure charged to one as possible high penetration into the capillary ends of the cracks and in the surface of the crack surfaces to reach.

Around the required final strength of the resin and the sufficient Composite of the resin with the surfaces to reach the allowed Networking process as possible not be disturbed by a relative movement of the elements. It is therefore necessary to put the anchor element quiet.

ever depending on the application situation, this can also be possible without problems. Especially with high mast constructions arise from the requirement However, immobilization poses significant problems. If the mast represents detachable component of the anchor element, it is conceivable that the Mast for Remediation purposes temporarily dismount. This is a very elaborate and especially at Wind turbines practically due to their size unrealizable process. Conceivable would be too a fixation of the mast by clamping. Depending on the size of the construction However, here too economic and constructive limits are set, so that this procedure in wind turbines in usual Not size is applicable. The waiting for windless phases is difficult to plan and also associated with high uncertainties.

The The object of the invention is to overcome the indicated Disadvantages of the prior art, a reliable and cost-effective To develop a method by means of the introduction of fillers Anchor elements can be post-consolidated without it being used for immobilization the anchor element of a separation or immobilization of means the anchor element held component, such as a pylon a wind turbine, needs.

The Task is achieved by the features listed in claim 1 solved. Preferred developments emerge from the subclaims.

For this purpose, a method is provided which has the following method steps: The anchor element is out of its lower end play position lifted out and held in this position. Then, the filling of the cavities is done with a filler. After the hardening time of the filling agent, the release of the anchor element from the holding forces takes place.

The Lifting out of a movement game having anchor element its lower play end position against the loads acting on it and the Hold in this position allows it is a fixed positional relationship between the anchor element and the surrounding one concrete body to reach. In a preferred embodiment, this takes place lifting out in such a way that the anchor element up is brought to the upper game end position, whereby the positional relationship additionally stabilized is, as a further movement in the direction of upper game end inevitably excluded is. In training this special process variant is the Anchor element with a resulting from the structural requirements defined force pressed against the upper end position. This will achieved that it also by the action of forces by the anchor element held component, such as the over the tilting moment of a pylon next to the pulling forces also mediated pressure forces, no longer a change of position of the anchor element can come by the contact forces against the upper Spielendlage are dimensioned so that these of the held component introduced and the Anspressrichtung counteracting Cross powers.

Provided it will enable the circumstances in a further process variant, the forces for lifting out after process step a) by applying one or more presses, preferably hydraulic Pressing on existing or created projections of the fastener or of the fastener and connected thereto Realized component. As presses in the sense of this invention are also other lifting or Verklemmmittel to look at.

To a further process variant takes place in the process step b) filling the cavities, in particular the joints between the anchor element and the concrete element by means of an injection method, preferably a pressure injection method with synthetic resin.

One Particularly important application of the method consists in the Post-consolidation of anchor elements for wind turbines.

In a further preferred variant of the method derived therefrom the lifting takes place after method step a) by means of at least one, Preferably, however, several presses by these under the arranged upper end of the anchor element forming annular flange are and are on the foundation body support.

The Invention is based on an embodiment from

1 Schematic sectional view of a wind turbine foundation with anchoring element
explained in more detail. In 1 is a typical foundation solution for fixing a pylon 4 a wind turbine shown. A pylon 4 is by means of a pylon flange located at its lower end 4.1 with a corresponding annular flange 1.1 , which at the same time the upper end of an anchor element 1 forms, bolted. This is the static, but also dynamic loads of the pylon 4 initiated. The anchor element 1 is formed in the shape of a curved and closed to a circle double T-profile and has a web and at its lower end an anchor flange welded thereto 1.2 on. The anchor element 1 is embedded in the upper part of the foundation (concrete body 2 within the meaning of the invention) and there stabilized with push-through and ring reinforcements (not shown).

After the implementation of prior art of course preparatory work, such as setting of injection wells, sealing with injection packers, cleaning, locating, surface treatment, etc., which are not the subject of the invention, takes place as a first step a) lifting the anchor element 1 , This is done by placing on the inside of the anchor element 1 that is, at the same time in the one through the pylon 4 formed interior, between the foundation top and the bottom of the inwardly projecting annular flange 1.1 of the anchor element 1 Press 5 , preferably hydraulic presses, are positioned. These are extended away and force controlled, causing the anchor element 1 on his lower end game position. According to the pylon must for this purpose 4 not from the anchor element 1 be separated. Rather, those over the pylon 4 with acting static loads with lifted out. After traveling the distance given by the game, the anchor element reaches 1 its upper game end position, in particular the upper flank of the annular ring of the anchor flange 1.2 comes into physical contact with the corresponding concrete inner surfaces of the foundation. After reaching this upper game end position are by continuing the lifting of the hydraulic presses 5 further tensile loads in the anchor element 1 brought in. As a result, it is fixed in its position even when over the pylon 4 In wind loads additional tilting moments compressive forces on the sections of the anchor element 1 exercise. To a stable position against the risk of pressure losses in the hydraulic presses 5 to ensure a fixation of the reached end positions of the presses 5 ,

Now, the process step b) of introducing the filling agent in the cavities takes place 3 , In the present embodiment, it is an injection of synthetic resin by high pressure injection via injection bores 6 is. In particular, the injected synthetic resin flows into the gap that forms under the anchor flange, thereby reliably filling this cavity. Furthermore, all other gaps and cracks, as far as achievable, filled and sealed.

The next Process step c) forms the waiting for the curing time.

After the curing time, the filling agent has reached its standard strength, so that again a sufficient adhesion between the anchor element and the corresponding concrete inner surfaces of the concrete element, both in tensile and compressive stress is achieved. Fixings or hydraulic presses 5 or under-catching devices are dissolved in process step d) and it is thus the application of force to the anchor element 1 completed.

Then what can However, not the subject of the invention, which is common in the prior art Post-processing measures such as corrosion treatment, sealings, surface treatments, etc.

One another, not shown embodiment relates to Post-consolidation of anchor elements of machines or other equipment with Vibrations or changing loads, such. As motors, production lines or crane rails. By pressing against the upper end position are Movements and vibrations of the anchor element prevented. Depending on concrete conditions can be consolidated by the proposed method carried out without it being necessary, the machine or plant out of order to take. Costly downtimes can be avoided.

1

anchor element

1.1

annular flange

1.2

anchor flange

2

concrete body

3

cavities

4

pylon

4.1

Pylonflansch

5

Press

6

injection well

Claims (8)

Method for post-consolidation of anchor elements 1 comprising the following method steps: a) lifting an anchor element ( 1 ) from its lower play end position and holding in this position b) filling the cavities ( 3 ) with a filling agent c) waiting for the setting time of the filling agent d) releasing the anchor element ( 1 ) of holding forces at the end of the hardening time of the filling agent Method according to claim 1, characterized in that the lifting out of the anchor element ( 1 ) in process step a) takes place up to the upper game end position. A method according to claim 2, characterized in that in the lifting out in step a) the anchor element ( 1 ) is pressed against the game end position determining contact surfaces. Method according to one of the preceding claims, characterized in that the lifting out of the anchor element ( 1 ) in process step a) by means of at least one press ( 5 ) he follows. Method according to one of the preceding claims, characterized characterized in that the filling in process step b) takes place in the injection process with synthetic resin. Method according to one of the preceding claims, characterized in that the method for the post consolidation of anchor elements ( 1 ) is applied by masts. A method according to claim 6, characterized in that the method for the post consolidation of anchor elements ( 1 ) of masts of wind turbines is applied. Method according to claim 6 and 7, characterized in that the lifting out of the anchor element ( 1 ) in process step a) by means of at least one press ( 5 ) takes place, wherein these in their axial working direction between a foundation body and an annular flange ( 1.1 ) is arranged.