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EP-3981950-B1 - ANCHORING SYSTEM FOR A BUILDING ELEMENT ON A BUILDING

EP3981950B1EP 3981950 B1EP3981950 B1EP 3981950B1EP-3981950-B1

Inventors

  • LIPS, STEFAN
  • Oberli, Christoph

Dates

Publication Date
20260513
Application Date
20201012

Claims (11)

  1. Anchoring system (10) for anchoring a structural element (12) designed as an intermediate ceiling to a structure (14) in tunnel construction, comprising ▪ a first anchoring means (20), which comprises a retaining element (16) designed as a sleeve (17) that is screwable into a borehole (18) in the structure (14), the retaining element having an external thread (24), ▪ a second anchoring means (50) that is able to be arranged on the structural element (12), and ▪ a clamping unit (40), characterized in that the clamping unit (40) comprises a first tie rod (42) which is able to be inserted with a first end section (44) into the sleeve (17) that is screwable into the borehole (18) and is held in an end region (21) of the sleeve (17) on the screw-in side, and a second tie rod (43) which is able to be inserted into the second anchoring means (50) and a tensioning device (60) for connecting the first tie rod (42) and the second tie rod (43) to each other.
  2. Anchoring system (10) according to claim 1, characterized in that the external thread (24) of the retaining element (16) designed as a sleeve (17) extends over the entire length of the sleeve (17), and that the retaining element (16) is able to be screwed completely into the first borehole (18).
  3. Anchoring system (10) according to claim 1 or 2, characterized in that the external thread (24) of the sleeve (17) is a self-tapping thread.
  4. Anchoring system (10) according to one of the preceding claims, characterized in that an internal thread (26) is formed on the inside of the screw-in end region (21) of the sleeve (17), into which internal thread the first tie rod (42) with a compatible thread (48) formed on the first end section (44) and/or an installation aid (30) is able to be screwed.
  5. Anchoring system (10) according to one of the claims 1 to 3, characterized in that an inlet-side end region (22) of the sleeve (17) opposite the screw-in end region (21) is designed with an accommodation (28) for an installation aid (30) for screwing the sleeve (17) into the made borehole (18).
  6. Anchoring system (10) according to claim 5, characterized in that the accommodation (28) at the inlet end region (22) of the sleeve (17) has a larger internal diameter than at the screw-in end region (21) of the sleeve (17).
  7. Anchoring system (10) according to one of the claims 4 to 6, characterized in that a separating element (36) is included, which is arranged between the installation aid (30) accommodated in the sleeve (17) and an adjacent end region of the sleeve (17).
  8. Anchoring system (10) according to one of the preceding claims, characterized in that the second anchoring means (50) comprises an anchor plate (51) which is connected to the second tie rod (43) to support the structural element (12).
  9. Anchoring system (10) according to claim 8, characterized in that the anchor plate (51) is connectible to the second tie rod (43) of the clamping unit (40) by means of a clamping nut (53).
  10. Anchoring system (10) according to one of the claims 1 to 7, characterized in that the second anchoring means (50) comprises a sleeve (57), that is able to be screwed completely into a second borehole (58), made in the structural element (12), with an external thread (54) formed over the entire length.
  11. Anchoring system (10) according to one of the preceding claims, characterized in that the tensioning device (60) is designed as a turnbuckle.

Description

Technical field of the invention The invention relates to an anchoring system for a structural element on a building, in particular (but not exclusively) for anchoring a structural element designed as an intermediate floor to a tunnel structure. State of the art Anchoring a structural element to a concrete structure, particularly an intermediate floor in tunnel construction, is subject to very high safety requirements. Intermediate floors in tunnels are generally reinforced concrete structures and are primarily used to separate a ventilation space from the traffic lane. The ventilation space typically has a sufficient duct cross-section for active ventilation and for the rapid extraction of exhaust air and smoke in the event of congestion or fire. To ensure this, the distance between an inner ring or inner lining of a tunnel structure and the intermediate floor is generally approximately 1.80 m. Due to the stringent safety requirements in tunnel construction, it is essential that the storage and/or suspension or support structure of the intermediate ceiling be freely accessible for inspection and maintenance purposes, i.e., in particular, freely accessible via the cavity between the intermediate ceiling and the inner ring. This also has the advantage that the traffic flowing through the tunnel is not disrupted during regularly scheduled inspections. In tunnel construction, the intermediate floor is generally supported on reinforced bearings, which are designed as strip corbels against a tunnel lining or the inner ring, so that the tensile forces resulting from the bearing forces are absorbed by the reinforcing steel. However, in areas with large spans, e.g., in areas of emergency bays and junctions, and for temporary securing, it is permitted to suspend the intermediate ceiling by means of devices on the tunnel structure, for example on its inner ring. The anchoring systems used must meet stringent safety requirements. These include, among other things, the suitability of the anchoring material, which must be sufficiently resistant to the aggressive and corrosive atmosphere prevailing in the tunnel, the extreme temperature fluctuations (e.g., in the event of a fire), and the static and dynamic loads that occur. Furthermore, there are regulations for the construction itself; that is, the use of adhesive anchors or welded anchor devices for suspending the intermediate floor is not permitted. It is also stipulated that slip-free, undercut, and fatigue-resistant fasteners with full concrete bond should be used for the installation of dynamically loaded anchors. Therefore, it is recommended to use undercut anchors or positive-locking anchors and embedded anchors in tension zones for heavy loads, such as intermediate floors. The so-called Swiss bar is well known, for example from EP 0 062 155 and CH 701 852 For anchoring heavy loads in rock, stone, or a concrete structure. The Swiss anchor bolt comprises an anchor rod with an external thread, one end of which is supported by an anchor plate against the component to be anchored. The opposite end of the anchor rod engages with an internal thread of a retaining element, which is embedded in rock, stone, or a concrete structure. For anchoring, a first borehole, the anchoring borehole, and a second borehole, the auxiliary borehole, are drilled in the rock, stone, or concrete structure at an acute angle to each other. The retaining element is inserted into the auxiliary borehole and is penetrated by the anchor rod inserted in the anchoring borehole. This allows the anchor rod in the anchoring borehole to be held against tensile stress by the retaining element inserted in the auxiliary borehole. Furthermore, the anchor rod can be secured within the retaining element against loosening caused by vibrations by means of a locking element. The securing element and the anchor rod traditionally form a positive connection. Since a large number of holes must be drilled with millimeter precision to position the Swiss tie rod, its use in supporting an intermediate floor in a tunnel structure is very labor-intensive, time-consuming, and costly. Furthermore, it is from DE 3 631 544 A method for anchoring a component in concrete is known, wherein a first borehole is drilled to receive a retaining anchor. Subsequently, a second borehole is drilled to receive a locking element. Starting from the first end of the first borehole, the borehole mouth, the second borehole partially overlaps and extends divergently from the first borehole. A locking element is inserted into the second borehole, which forms a positive connection with the retaining anchor. For example, the locking element can comprise reactive composite components stored in a cartridge, which are released by screwing in the retaining anchor and exert their anchoring effect. Out of DE 10 2013 109428 A1 An anchoring system is known with a coil spring wound from a spring wire, which can be screwed into a sleeve and on whose mou