Threaded sleeve for anchoring building elements in a concrete structure, and a spacing tube

Abstract

The threaded sleeve (1) for anchoring structural elements in a concrete structure comprises radially extending notches (13) on webs (9). A spacer tube (15) can be attached to these notches (13), which allows the threaded sleeve (1) to be installed deeper into the structure, and / or a positioning and anchoring plate (31) can be attached to the notches (13), which allows the threaded sleeve (1) to be anchored in the structure at any point and at any angle without the need to attach the threaded sleeve (1) to formwork.

Description

[0001] The subject of the invention is a positioning and anchoring plate for a threaded sleeve or a spacer tube according to the preamble of the patent claim 1. The threaded sleeve is a threaded sleeve for anchoring structural elements in a concrete structure. The spacer tube is a spacer tube for extending the base body of a threaded sleeve.

[0002] Threaded sleeves of the type mentioned are cast into concrete during the construction of concrete structures in order to be able to fasten structural elements such as consoles, scaffolding, protective railings, hoists or formwork to them with tension rods on which helical or spaced threads are arranged or with eyebolts, or to be able to lift these structural elements.

[0003] Such a threaded sleeve is known from CH 684 648. It comprises a tubular base body with a threaded bore in its center, into which threaded bolts, such as tension rods, can be screwed from one side. On the closed end opposite the open end, a cover plate is formed, which on the one hand closes the threaded bore and projects radially beyond the periphery of the base body. This cover plate, which also serves as an anchor element, can be designed as a circular disk or consist of disk sections in the area radially outside the periphery of the base body. Several, for example three, webs run along the outer shell from these disk sections or the periphery of the disk. Initially, the webs are conical in the area between the cover plate and the outer surface of the base body, then the edges of the webs run parallel to the axis.The base body is designed in a step-like manner, which means that at the open end of the base body its wall thickness is less than in the middle and in the area of ​​the cover plate.

[0004] Such threaded sleeves are used millions of times and can absorb loads of up to several tons, i.e. tensile forces that act axially outwards.

[0005] The familiar threaded sleeves are attached using peg-shaped elements with a conical base, which are fastened to the formwork of the concrete structure with a nail. The concrete sleeves to be attached are pushed onto the conical part of the peg after the nail has been driven in. The peg therefore serves both as a holding element for the threaded sleeve and at the same time closes the open side of the threaded hole, thus preventing cement water from penetrating the threaded hole. After the structure has been constructed and the concrete has hardened, the peg is pulled off the threaded sleeve together with the formwork wall during stripping or, if the peg remains in the threaded sleeve, it can be pulled out of the threaded sleeve using the nail. For steel formwork, magnets must be inserted into the peg to adhere to the formwork. Such threaded sleeves are very expensive.

[0006] The threaded sleeve is therefore always located in a superficial area of ​​the structure. The extraction forces that can be extracted from the threaded sleeve are therefore limited solely by the threaded sleeve's position close to the surface in the structure, for example to approximately 2800 kg. This means that not just any structural elements can be attached to such threaded sleeves because their holding force is too small and their safety too low, for example when walk-on scaffolding has to be attached to threaded sleeves. In order to suspend heavier loads from threaded sleeves, significantly more expensive and longer threaded sleeves made of other materials such as steel are required. Another alternative to the relatively short threaded sleeves made of plastic are threaded sleeves with a longer thread section, but this means that screwing in the tensioning rods is more time-consuming and consequently incurs additional (labor) costs.In addition, longer threaded sleeves can be torn off the formwork when backfilling the formwork with liquid concrete due to the large leverage.

[0007] New buildings inevitably require better insulation, which often results in insulating panels being installed on the exterior of concrete walls. These panels are inherently porous or less resilient, and therefore significantly less strong than the concrete wall. If the insulating panels are attached to the formwork panels during the construction of the wall, the threaded sleeves previously used, which are directly connected to the surface of the building, cannot simply be inserted into the insulating or lightweight panels; instead, they must be connected to the back of the concrete structure.

[0008] To bridge the soft part of the structure, namely the insulation, which cannot be used as an anchor, the existing threaded sleeves could be provided with a longer base body. In other words, instead of, for example, 60 mm in length, the threaded sleeves could be 100 mm, 150 mm, or more. However, this would mean that, depending on the thickness of the insulation panel, differently shaped threaded sleeves would have to be manufactured, kept in stock, and made available on site. Furthermore, attaching such "long" threaded sleeves is difficult because high forces from the liquid concrete flowing in during concreting or during installation of the insulation act on the threaded sleeves transverse to the longitudinal axis, which can tear them away from the formwork. This results in no threaded sleeve at the desired location.

[0009] An object of the present invention is to provide a threaded sleeve which can be used in a conventional manner and which can be adapted to the respective conditions on the construction site depending on the requirement of the extraction force to be ensured and the design of the concrete structure.

[0010] A further object of the invention is to enable a threaded sleeve that can be used on both wooden and steel formwork.

[0011] A further object of the invention is to enable a threaded sleeve that can absorb significantly greater pull-out forces by being arranged deeper in the structure and consequently being able to be positioned at a correspondingly suitable position in the structure.

[0012] This object is achieved by a positioning and anchoring plate according to claim 1. Advantageous embodiments are described in the dependent claims.

[0013] With the positioning and anchoring plate according to the invention, it is possible to position and anchor the threaded sleeve in the concrete mass at different distances and angles to the surface of the structure using one and the same design. By attaching a spacer tube, it is possible to arrange the threaded sleeve behind an insulation layer and / or to move it further into the interior of the structure in order to achieve a much higher pull-out force.

[0014] The ability to adapt the threaded sleeve to the thickness of the insulation or to a greater reinforcement coverage by attaching a spacer tube means that any arrangement can be implemented with one and the same threaded sleeve without the need for special stock. The connection between the short standard threaded sleeve and a spacer tube is achieved by simply plugging it on, locking it into notches, or turning it in a thread. The attached spacer tube can further increase the pull-out force if the spacer tube also has threads. The spacer tube can be provided with predetermined breaking points so that the spacer tube can be either cut or sawn off and thus shortened at the desired point. A spacer tube protruding above a surface of a building, for example a floor slab, can be knocked off after the building is completed or has hardened, without the need for cutting tools.

[0015] If a positioning or anchor plate is also used, it can either be attached directly to the threaded sleeve or attached anywhere on the spacer tube. The positioning or anchor plate allows the threaded sleeve to be attached to the reinforcing bars with or without the spacer tube at any location within the structure, thereby further increasing the pull-out force. Depending on the pull-out force requirements, the threaded sleeve and / or the positioning or anchor plate can be made of plastic, fiber-reinforced plastic, metal, or other materials.

[0016] The pull-out force can be further increased by the positioning or anchor plate because the pull-out cone is enlarged many times over and, when connected to reinforcing iron, can become even larger.

[0017] Threaded sleeves can be positioned essentially anywhere using the positioning or anchor plate, and the threaded sleeve can be inserted at right angles to the structure's surface, or at any other acute angle. Moving threaded sleeves using a positioning or anchor plate is simple and is achieved by attaching the positioning or anchor plate to the reinforcement elements with iron ties. The threaded sleeve is held securely and accurately in position by the positioning or anchor plate. Furthermore, the positioning or anchor plate offers the option of attaching the threaded sleeves to the reinforcement with iron ties, allowing them to be positioned accurately even on structures with steel formwork, without the need for an expensive and complex magnetic cone.

[0018] The invention is explained in more detail using exemplary embodiments. They show: Figure 1a perspective view of a spacer tube from above, Figure 2the spacer tube in Figure 1 perspective view from below, Figure 3 a perspective view of the base body of the threaded sleeve from above, Figure 4 a perspective view according to Figure 3 from below, Figure 5 an axial section through the base body, left view, right section with visible threads, Figure 6 a perspective view of a closure plug, Figure 7 a perspective view of a positioning and anchoring plate, Figure 8 a perspective view of the positioning and anchoring plate, placed on the base body, Figure 9 a top view of the positioning and anchoring plate and the base body and Figure 10 a side view of the positioning and anchoring plate and the base body.

[0019] In the Figures 3 and 4Reference numeral 1 denotes a threaded sleeve of known construction, additionally provided with fastening means on the webs 9, which will be described later. The threaded sleeve 1 comprises, for example, a base body 3 made up of three coaxially arranged cylindrical sections 3a, 3b, and 3c with different diameters. A threaded bore 5 axially penetrates the three sections 3a, 3b, and 3c. The threaded bore 5 can comprise a single helical thread or be formed by several interrupted threaded sections 7 that extend over the entire axial length or only over a partial area.

[0020] On the lateral surface of the cylindrical sections 3a, 3b, and 3c, three star-shaped webs 9 are formed - in the example shown. The webs 9 protrude radially outward from the base body 1. The lower region of the webs 9 is preferably conical and ends at a cover plate 11. The cover plate 11 can be designed as a circular disk (not shown) or, in the area outside the periphery of the lower section 3c, consist of circular ring sections. The cover plate 11 closes the lower end of the threaded bore 5.

[0021] In the example shown, the base body 3 comprises the three cylinder sections 3a, 3b, and 3c. Of course, only one, two, or more than three cylinder sections could be present. Alternatively, the base body 3 can also have a surface area corresponding to the surface area of ​​a truncated pyramid, truncated circular cone, or cylinder.

[0022] In contrast to the known design of the threaded sleeve, on the threaded sleeve 1 shown here, notches 13 are recessed at intervals on the webs 9. The notches 13 can have a rectangular or V-shaped cross-section. With a rectangular cross-section, these have an axial height h. The flanks of the notches 13 can be parallel to one another and at a right angle to the axis A of the threaded sleeve 1 or, alternatively, can be arranged at an acute angle to the axis A. The flanks of the notches 13 are preferably not flat, but cambered or run at an acute angle to the axis A, so that the height h is smallest in the middle of the notches 13.

[0023] The threaded sleeve 1 is preferably made of plastic, which can be additionally reinforced with fibers. However, the threaded sleeve 1 can also be manufactured as a metal injection-molded part, a metal deep-drawn or ironed part, or another material. A combination of plastic and metal is also possible.

[0024] In the Figures 1 and 2 A spacer tube 15 is shown. The spacer tube 15 comprises a centrally arranged cylindrical tubular body 17, the bore 19 of which has a diameter corresponding to the diameter of the threaded bore 5 in the threaded sleeve 1. In the example described, webs 9a are formed on the outer surface of the tubular body 17, and incisions 13a are formed on the webs 9a. The webs 9 and incisions 13 correspond to the webs 9 and 13 on the threaded sleeve 1. They are therefore distributed in the same way over the outer surface of the tubular body 17.

[0025] The Figures 1 and 2The lower end of the spacer tube 15 is designed as a short tubular cylinder 21, the outer diameter of which is larger than the outer diameter of the tubular body 17 and the inner diameter of which corresponds to the outer diameter of the section 3c on the base body 3. Alternatively, the casing of the base body 3 can have a larger diameter on the threaded sleeve 1 in the area of ​​the opening, such that an internal thread for screwing in the spacer tube 15 is formed in this area. The internal thread on the threaded sleeve 1 and on the spacer tube 15 are not shown. The corresponding design of an internal thread on the spacer tube 15, if one is provided, is also not shown.

[0026] L-shaped hooks 23 are formed on the casing of the tubular cylinder 21, with the shorter leg of the hook 23 projecting radially away from the tubular cylinder 21 being shorter than the longer leg. The longer leg runs essentially tangentially to the casing of the tubular cylinder 21. The radial distance of the longer leg of the hook 23 from the casing surface of the tubular cylinder 21 corresponds to the distance b or is slightly greater than the distance b of the base of the incisions 13 from the casing of the tubular body 17 or the section 3c on the threaded sleeve 1 (cf. Figures 2 and 3 ).

[0027] If the spacer tube 15 is pushed axially onto the threaded sleeve 1, whereby the hooks 23 must lie between the webs 9 during placement, the spacer tube 15 or the threaded sleeve 1 can then be rotated clockwise, whereby the hooks 23 engage and hook or lock into the notches 13 on the webs 9 of the base body 1, thus achieving a rigid, tight, and tensile-resistant connection between the two elements. The threads or threaded sections 7 in the bore 19 on the spacer tube 15, if such are formed on the latter, are arranged such that, when the spacer tube 15 is placed on the threaded sleeve 1, they form a continuous thread with the threaded sections 7 in the threaded sleeve 1.These two parts – threaded sleeve 1 and spacer tube 5 – now form an extended threaded sleeve, the cover plate 11 of which can either be positioned at a greater distance from the surface of the structure in which the threaded sleeve 1 is inserted, or the threaded sleeve 1 is positioned within the structure as before, and the spacer tube 15 penetrates an insulation layer on the surface of the structure. Within the insulation layer, the spacer tube 15 now forms a guide to the threaded sleeve 1 for a tie rod, to which a scaffold or a support device can be attached.

[0028] In an advantageous embodiment of the spacer tube 15, circumferential or partially circumferential grooves 25 are formed in its outer surface, which serve as predetermined breaking points. The grooves 25 are each arranged in the same axial position as the notches 13. In this way, the spacer tube 15 can be easily reduced to the desired length using a sharp knife or saw. If the spacer tube 15 is already embedded in a concrete ceiling, the portion protruding above the surface of a floor slab can be chipped off.

[0029] Of course, the spacer tube 15 can not only be placed on the threaded sleeve 1, but the spacer tube 15 can also be arranged on a first spacer tube 1 already placed on a threaded sleeve 1 for further extension. For this purpose, each spacer tube 1 is provided at its upper end, i.e., opposite the tubular cylinder 21, with an axially extending opening 27 of the webs 9, as is also the case with the threaded sleeve 1.

[0030] As an alternative to incisions 13 in axially extending webs 9, rows of knobs or projections arranged in the axial direction can be formed on the casing of the threaded sleeve 1 and on the spacer tube 15, between which the incisions 13 then arise (not shown). Accordingly, after the spacer tube 15 is placed on a threaded sleeve 1 or on a spacer tube 15 already placed on the threaded sleeve 1, the hooks 23 engage between the knobs or projections, thus forming a firm connection between the threaded sleeve 1 and the spacer tube 15. Other elements can also be positively attached to the knobs, projections, or incisions.

[0031] Furthermore, instead of incisions, knobs or bumps, rows of oblique teeth can be formed which, when a spacer tube 15 is attached, hook onto it and create an indetachable connection.

[0032] In Figure 6A conventional closure pin 29 is shown, which is inserted into the upper end of the threaded sleeve 1 or, if a spacer tube 15 is mounted on the sleeve, into the upper end of the mounted spacer tube 15. Using the closure pin 29, the threaded sleeve 1, with or without the spacer tube 15, can be fastened to a formwork wall in a conventional manner before the structure is concreted, and the threaded hole can be protected against the penetration of concrete water.

[0033] The Figures 7 to 10show a positioning or anchor plate 31, which can be placed directly onto a threaded sleeve 1 and / or onto a spacer tube 15, which is fastened to the threaded sleeve 1, at a predeterminable distance from the cover plate 11. The positioning and anchor plate 31 comprises a recess 33, which is preferably arranged in the center of the positioning and anchor plate 31. In the recess 33, which forms a socket 34, circular ring sections 35 are formed, the ends of which are spaced apart by a distance X. The distance X corresponds to the thickness s of the webs 9 or 9a or the bosses or knobs. The axial extent of the circular ring sections 35 corresponds to the axial extent h of the incisions 13. The number of circular ring sections 35 corresponds to the number of webs 9, 9a or the number of rows of knobs. Together, these form a type of bayonet closure.

[0034] The positioning and anchoring plate 31 comprises a grid body 37 formed by rungs 39 and a frame 41. The substantially central recess 33 is defined by the socket 34, which is connected to the frame 41 and / or the rungs 39. The positioning and anchoring plate 31 can be made of plastic with or without fiber reinforcement or of metal.

[0035] The edges that border the incisions 13 on the sides and at the base, as well as the alternatively attached knobs or projections on the threaded sleeve 1 and on the spacer tube 15, are bevelled in such a way that when the positioning and anchoring plate 31 is pushed on, it centers itself and slides into the incisions 13 or projections or knobs without the worker having to see it, and can then be locked into place by a rotary connection. Due to these conical insertion areas on the incisions 13 or knobs or projections, the positioning and anchoring plate 31 slides automatically into the centered position when it is put on and therefore only needs to be rotated at the intended location or at the prescribed distance from the end of the spacer sleeve 1 or the spacer tube 15. Due to suitably arranged barbs on the periphery of the projections or knobs or on the parts of the threaded sleeve 1 or the spacer tube located between the incisions 13.of the spacer tube 15, after the rotational movement by a few angular degrees, the positioning and anchor plate 31 is locked, so that it can no longer be released from the locking mechanism even as a result of vibrations, e.g. during the introduction and vibration of the liquid concrete.

[0036] To connect the positioning or anchor plate 31 to a threaded sleeve 1 or a spacer tube 15, the positioning or anchor plate 31 is pushed axially from above over the threaded sleeve 1 or the spacer tube 15 and then rotated by a few degrees at the desired height, so that the circular ring sections 35 engage in the notches 13 or 13a or between the knobs or bosses on the threaded sleeve 1 or the spacer tube 15 and are thus axially secured. Hook-shaped elements (not shown) at the ends of the circular ring sections 35 can ensure that the rotation of the positioning or anchor plate 31 with respect to the threaded sleeve 1 or the spacer tube 15 results in a mutual, permanent locking.

[0037] With the positioning or anchor plate 31, the threaded sleeve 1 can be fastened to the reinforcing iron (reinforcing iron not shown) at the desired location using iron ties without prior fastening to a wooden or steel formwork for the structure to be constructed before pouring the concrete.

[0038] Using the positioning and anchor plate 31, the threaded sleeve 1 can be attached to the reinforcing iron in any position, i.e., at any angle or distance from the surface of the structure. Consequently, it is possible to position the threaded sleeve 1 at an angle of, for example, 45°, so that supports for formwork can be connected directly to the threaded sleeve 1. At the same time, it is also possible to position the threaded sleeve 1 at any location or at any distance from the surface of the structure. By placing the threaded sleeve 1 deeper within the structure, the pull-out force, i.e., the load-bearing capacity of the threaded sleeve 1 and the pull-out cone on the structure, is significantly increased, preventing it from breaking out of the surface of the structure under high loads.The attachment of the threaded sleeve 1 to the reinforcing bars also ensures that during concreting, i.e., when pouring the liquid concrete, the threaded sleeve 1 does not become detached from the formwork and thus displaced or even torn unusably into the interior of the structure. Furthermore, threaded sleeves 1 can be securely positioned even when using steel formwork without the need for expensive and complex cones.

[0039] Due to its geometric extension and connection in the reinforcing iron, the positioning or anchor plate 31 increases the pull-out force of a prestressing rod many times over compared to the pull-out force of a threaded sleeve 1 without the positioning or anchor plate 31.

[0040] As an alternative to the described embodiments of the connection of threaded sleeve 1 and positioning and anchoring plate 31 or of threaded sleeve 1 and spacer tube 15, a continuous thread or a thread consisting of a plurality of threaded sections can be arranged on the casing of the tubular body 17 of threaded sleeve 1 and on spacer tube 15, onto which thread the positioning and anchoring plate 31, in whose socket 34 a thread is arranged, can be screwed and can be axially positioned in this way (no illustrations).

[0041] The threaded sleeve 1 can be a threaded sleeve 1 for anchoring structural elements such as formwork, brackets, scaffolding, protective railings and lifting tools in a concrete structure with the aid of a tension rod or a screw formed with a thread, wherein the threaded sleeve 1 comprises a tubular base body 3 with a cylindrical threaded bore 5 and a cover plate 11 closing the threaded bore 5 on one side, wherein means for non-positively or positively placing and connecting a spacer tube 15 with a central cylindrical bore 19 and / or a positioning and anchoring plate 31 are formed on the base body 3.

[0042] As means for placing and connecting the spacer tube 15, webs 9 or rows of knobs or bosses can be formed on the sleeve of the threaded sleeve 1, parallel to the axis A of the threaded sleeve 1, and on the sleeve of the threaded sleeve 15, or an external thread can be formed on the sleeve of the threaded sleeve 1 as a means for placing and connecting a spacer tube 15.

[0043] On the peripheral edges of the webs 9 on the spacer tube 15 and on the base body 3 of the threaded sleeve 1, incisions 13 can be recessed at intervals or incisions 13 can be formed between the knobs or bosses by intervals, in which, after the spacer tube 15 has been pushed onto the base body 3 and after rotation of the spacer tube 15, tangentially aligned hooks 23 are formed at the lower end of the spacer tube 15, which engage in the incisions 13 on the base body 3 and can be latched there.

[0044] An internal thread can be formed on the lower end of the spacer tube 15, which is intended to mesh with the external thread on the threaded sleeve 1.

[0045] The incisions 13 can have conical or cambered edge areas or the knobs and humps can have conical flanks and the hooks 23 on the spacer tube 15 can have conical side surfaces and engage in the incisions 13 on the base body 3 essentially without play.

[0046] The spacer tube 15 comprises a plurality of fully or partially circumferential predetermined breaking grooves 25, which are arranged in the region of the incisions 13 or between the knobs or bumps.

[0047] One or more threads or thread sections can be formed in the bore 19 in the spacer tube 15.

[0048] A thread with one thread turn or with a thread turn consisting of thread sections can be formed on the base body 17.

[0049] The positioning and anchoring plate according to the invention is a positioning and anchoring plate for placing and fastening on the tubular section of the base body 3 of a threaded sleeve 1 or a spacer tube 15, with a grid body 37 with a central recess 33 for passing through the cylindrical section of the threaded sleeve 1 or the spacer tube 15, wherein means for positively or non-positively fastening the grid body 37 to the cylindrical section are formed in the recess 33.

[0050] According to one embodiment, the means comprise a circumferential socket 34 which is formed in the recess 33 and is formed from a plurality of spaced-apart tangentially spaced circular ring sections 35 arranged on the circumference of the recess 33.

[0051] According to one embodiment, the flanks of the circular ring sections 35 have inclined inlet areas in the axial and radial directions.

[0052] According to one embodiment, the spaced circular ring sections 35 are intended to lie between axially extending webs 9 on the threaded sleeve 1 during sliding on.

[0053] According to one embodiment, the axial length of the circular ring sections 35 corresponds to the axial length of the incisions 13 in the webs 9.

[0054] According to one embodiment, after sliding on and by rotating about the axis of symmetry A of the threaded sleeve 1 or the spacer tube 15, it can be locked to the threaded sleeve 1 or the spacer tube 15 by means of barbs formed on the circular ring sections 35.

[0055] According to one embodiment, an internal thread with one thread turn or with several thread turn sections is formed in the recess 33.

[0056] The spacer tube 15 can be a spacer tube 15 for extending the base body 3 of a threaded sleeve 1, comprising a tube body 17 with means 7 arranged at both ends for positively connecting the spacer tube 15 to a threaded sleeve 1 and / or another spacer tube 15 and with threads formed in the tube body 17.

[0057] Means for positioning and fastening a positioning and anchor plate 31 can be formed on the casing of the tubular body 17.

Claims

1. Positioning and anchor plate for placing and fastening on the tubular section of the base body (3) of a threaded sleeve (1) or a spacer tube (15), characterized by a grid body (37) with a central recess (33) for passing through the cylindrical section of a threaded sleeve (1) or a spacer tube (15), wherein means for positively or non-positively fastening the grid body (37) to the cylindrical section are formed in the recess (33).

2. Positioning and anchor plate according to claim 1, characterized in that the means comprise a circumferential socket (34) which is formed in the recess (33) and is formed from a plurality of spaced-apart, tangentially spaced annular portions (35) arranged on the circumference of the recess (33).

3. Positioning and anchor plate according to claim 2, characterized in that the flanks of the circular ring sections (35) have inclined inlet areas in the axial and radial directions.

4. Positioning and anchor plate according to one of claims 2 or 3, characterized in that the spaced circular ring sections (35) are intended to lie between axially extending webs (9) on the threaded sleeve (1) during sliding on.

5. Positioning and anchor plate according to claim 2, characterized in that the axial length of the circular ring sections (35) corresponds to the axial length of the incisions (13) in the webs (9).

6. Positioning and anchor plate according to claim 5, characterized in that after being pushed on and by rotating the threaded sleeve (1) or the spacer tube (15) around the axis of symmetry A, it can be locked to the threaded sleeve (1) or the spacer tube (15) by means of barbs formed on the circular ring sections (35).

7. Positioning and anchor plate according to claim 1, characterized in that an internal thread with one thread turn or with several thread turn sections is formed in the recess (33).

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