EP4493770B1 - Vorgefertigte schuhbasis und vorgefertigter schuh - Google Patents

Vorgefertigte schuhbasis und vorgefertigter schuh

Info

Publication number
EP4493770B1
EP4493770B1 EP22714829.3A EP22714829A EP4493770B1 EP 4493770 B1 EP4493770 B1 EP 4493770B1 EP 22714829 A EP22714829 A EP 22714829A EP 4493770 B1 EP4493770 B1 EP 4493770B1
Authority
EP
European Patent Office
Prior art keywords
precast
shoe base
shoe
rebar
threaded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP22714829.3A
Other languages
English (en)
French (fr)
Other versions
EP4493770C0 (de
EP4493770A1 (de
Inventor
Sayed DAHER
Ming Keat CHONG
Alvin DEVADAS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leviat GmbH
Original Assignee
Leviat GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Leviat GmbH filed Critical Leviat GmbH
Publication of EP4493770A1 publication Critical patent/EP4493770A1/de
Application granted granted Critical
Publication of EP4493770C0 publication Critical patent/EP4493770C0/de
Publication of EP4493770B1 publication Critical patent/EP4493770B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
    • E04B1/21—Connections specially adapted therefor
    • E04B1/215—Connections specially adapted therefor comprising metallic plates or parts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/162—Connectors or means for connecting parts for reinforcements
    • E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/162—Connectors or means for connecting parts for reinforcements
    • E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
    • E04C5/165—Coaxial connection by means of sleeves

Definitions

  • the invention relates to a precast shoe base and a precast shoe comprising such precast shoe base.
  • precast structure components In the technical field of concrete building structures a variety of precast structure components are used to a wide extent, in order to save cost and time in the on-site building process.
  • factory fabricated precast structure components comprise a number of metal precast shoes, which are cast-in into a concrete body, and which allow for bolting together such precast structure components on site.
  • such precast shoes comprise a shoe base, to which a number of rebars (short for reinforcing bars) are connected.
  • the shoe base has a front section facing the outer contour of the concrete structure and an opposite rear section being oriented towards the inner part of the concrete structure.
  • the shoe base has in said front section a central bolt hole, which is accessible by the mounting personnel, and through which a threaded fastening bolt of an adjacent building structure is passed.
  • the mounting personnel fixes and fastens the precast structure in the desired position by means of nuts and washers screwed onto the threaded fastening bolt.
  • the cast-in rebars are designed for force coupling and force transmittal from said fastening bolt through the shoe base into the precast concrete structure. At least one pair of cast-in primary rebars are located in close vicinity to the bolt hole, and carry the majority of the acting longitudinal loads. Due to some eccentricity between the bolt hole and the primary rebars resulting bending moments are involved as well. In order to cope with such bending moment at least one secondary rebar is connected to the shoe base at its rear section. While the combination of primary and secondary rebars allows for transmitting both longitudinal forces and bending moment, the shoe base of the precast shoe itself is subjected to said bending moment as well.
  • EP 1 057 950 B1 discloses numerous embodiments of such precast shoes each having a shoe base with a bolt hole, a pair of primary rebars in close vicinity to the bolt hole, and at least one secondary rebar in the shoe base's rear section.
  • the shoe base has a complex geometric shape formed of welded steel plates. Vertically arranged sheet metal parts are welded to a horizontally arranged base sheet metal part in order to act as reinforcement parts, thereby forming a three dimensional structure of the shoe base.
  • Document EP 1 057 950 B1 discloses all the features of the preamble of claim 1.
  • a common feature of all disclosed embodiments is the arrangement of vertically oriented sheet metal parts, providing the required bending stiffness and bending load bearing capability of the shoe base.
  • the rebars are welded to the shoe base, wherein the vertically oriented sheet metal parts additionally serve to provide sufficiently long welding seams. While such embodiments suffice to carry the acting loads, the process of manufacturing such welded structures is demanding and cost intensive. Furthermore, a fixed arrangement of shoe base and rebars is given, which requires extensive stock-keeping to cope with different geometric mounting requirements.
  • the rebars are screwed to the base sheet metal.
  • the vertically oriented sheet metal parts serve as a reinforcement structure only, without supporting the rebars.
  • the screwing connection of the rebars allow for some flexibility in adapting the precast shoe's configuration to the actual demand.
  • the manufacturing effort of the welded shoe base's structure is still high.
  • the screwed connection of the rebars is limited in its load carrying capability.
  • the object of the present invention is to provide a shoe base with reduced complexity without compromising structural integrity.
  • a further object of the present invention is to provide a precast shoe with a simple yet flexible design.
  • a precast shoe base for a precast shoe wherein the precast shoe base has a front section with a bolt hole and with at least two threaded primary rebar holes, and wherein the precast shoe base has a rear section located opposite to the front section.
  • the precast shoe base has a generally flat plate shape having in the front section adjacent to the bolt hole a first plate thickness and having in the rear section a second plate thickness being smaller than the first plate thickness.
  • the precast shoe base has a generally flat bottom surface, wherein the cross-section of the precast shoe base is tapered from the first thickness adjacent to the bolt hole to the second thickness in the rear section.
  • the precast shoe base is made as a monolithic part of molded ferrous material.
  • a precast shoe comprising such precast shoe base and at least two separate primary rebars being threaded to match the threaded primary rebar holes of the precast shoe base.
  • the rear section is provided with at least one threaded secondary rebar hole.
  • said precast shoe further comprises at least one separate secondary rebar being threaded to match the threaded secondary rebar hole of the precast shoe base.
  • shoe base and "precast shoe base” define the entire metal structure, to which the primary and optional secondary rebars are connected before being cast-in into the concrete material, and which together with the primary and secondary rebars forms the fully functional precast shoe.
  • the invention provides a number of advantages over the prior art.
  • the threaded primary and secondary rebar holes allow for varying configurations of the precast shoe by simply screwing-in rebars of dimension according to the actual demand.
  • Semi-finished precast shoe-bases may be kept in store with unthreaded holes, while such holes can be bored up to the required diameter and then tapped with the required thread. Based on that idea, a large variety of applications can be covered by using standardized Semi-finished precast shoe-bases. The same applies to the rebars, which can be kept in store in a reasonable variety, and which can be chosen and connected to the shoe base as required.
  • the threads of the rebar holes and/or of the rebars can also be manufactured according to the actual demand.
  • threads may be cut in a traditional way, but are preferably rolled threads, which leads to a high load bearing capability even at short thread engagement lengths.
  • Such threads are formed by pressing dies into the rebar, which allows for the material to move or shape into threads, instead of being cut away. This type of cold forging process results in good thread strength and reduces possibility of thread stripping.
  • the inventive tapering of the plate thickness follows the mechanical load distribution within the shoe base: The loads are highest in the vicinity of the bolt hole and the primary rebars.
  • the relatively large first plate thickness in this area copes in particular with said high loads, and also provides a significant length of the threaded primary rebar holes with related high load bearing capability.
  • the comparably small second plate thickness is provided at a place, where primarily longitudinal forces are induced by the secondary rebar(s), while relative low bending moments are involved.
  • the tapered plate thickness between both follows the increase of the bending load along the way from the rear section to the front section.
  • the generally flat plate shape of the shoe base embodied as a monolithic part of molded ferrous material suffices for that, without the need of welded-on or otherwise fastened reinforcement structure.
  • the tapered thickness of the monolithic design might be formed by forging iron or steel.
  • said monolithic part of molded ferrous material is cast iron or cast steel.
  • the rear section is provided with at least one holding anchor being integrally formed by the monolithic part of molded ferrous material as a single piece.
  • Said holding anchor is formed by the same and single casting or forging process as used for the remainder of the precast shoe base without additional effort.
  • Such holding anchor can be used in the alternative to and as a replacement for the aforementioned secondary rebar, or can be used in combination therewith.
  • a compact yet highly reliable stress and force transmission between the precast shoe and the surrounding concrete is achieved by means of the cast-in holding anchor, in order to counteract the load eccentricity resultant from the distance between the anchor bolt and the primary rebars.
  • the precast shoe base has a top surface, wherein the top surface is provided with extension collars surrounding the threaded rebar holes.
  • the inner thread of the rebar holes is extended in its axial direction, covering both the thickness of the shoe base's main body plus the extension collar.
  • the enlarged length of the rebar hole threads allows to keep the thickness of the shoe base's main body to a minimum without compromising the thread load bearing capability. Material and weight can be saved, which leads to reduced cost and improved handling.
  • the tapered thickness of the shoe base can be varied in a large range.
  • the second plate thickness is less than two-thirds and in particular less than 50% of the first plate thickness, which lead to a desired balance between material saving and structural integrity.
  • the precast shoe base has in the vicinity of the primary rebar holes a first width and in the vicinity of the secondary rebar hole a second width being smaller than the first width.
  • the second width is less than two-thirds and in particular less than 50% of the first width.
  • the precast shoe base in its front section is provided with a guide plate having frontal positioning edge.
  • Said frontal positioning edge allows for easy alignment of the precast shoe with the outer wall of cast mold.
  • the guide plate has at least one and in particular two beveled corner positioning edges. These are helpful when aligning the precast shoe with an inner corner of cast mold.
  • Said guide plate is not subjected to high working loads. It is therefore desired to keep the thickness of the guide plate to a practical minimum.
  • the guide plate has a third plate thickness, while that the third plate thickness is less than 25% and in particular less than 15% of the first plate thickness. Despite such reduced thickness the guide plate can still be reliably formed by casting or forging, and has sufficient strength to fulfill its alignment task under the rough conditions of manufacturing precast concrete structures.
  • the a removable mounting access former or recess former is provided to form a mounting recess during casting-in the precast shoe, wherein the mounting access former is embodied in a two-part form by a spacer former and a recess former, and wherein the spacer former is positioned between the recess former and the frontal positioning edge of the precast shoe base.
  • Said two-part form takes into account the geometrical complex upper surface of the shoe base by means of the spacer former.
  • the spacer former allows for a precise positioning of the recess former relative to the frontal positioning edge without being influenced by the remaining irregular shoe base geometry.
  • Fig. 1 shows in schematic perspective view a precast concrete structure element 31, shortly before being connected to a second concrete structure element 32.
  • Both concrete structure elements 31, 32 are indicated by their outlines only to allow visibility of cast-in connection elements as described below.
  • the precast concrete structure 31 is a precast concrete column with upright orientation.
  • the precast concrete structure can be of any other orientation, shape and/or function including wall or floor elements.
  • the precast concrete structure element 31 has rectangular cross section with an outer circumferential wall 36 and with four corners at its base surface facing the second concrete structure element 32. At each corner, each one inventive precast shoe 1 is cast-in into concrete material, using appropriate formwork or molds in the factory.
  • the accordingly prepared precast concrete structure element 31 is transported to the construction site in a read-to-assemble state, and is mounted to another structure on-site as shown in Fig. 1 .
  • the schematically indicated second concrete structure element 32 is an on-site cast concrete foundation of a building, featuring a number of upright anchor bolts 33 corresponding to the number and orientation of the precast shoes 1 of the precast concrete structure element 31.
  • the anchor bolts 33 are cast-in into the concrete material of the second concrete structure element 32.
  • the second concrete structure element 32 can also be another precast concrete column to form multi-story building, or any other precast concrete structure.
  • the precast concrete structure element 31 may also be connected to a steel substructure or any other suitable structure by means of the cast-in precast shoes 1 together with suitably arranged anchor bolts 33.
  • Fig. 2 shows an exploded view of one individual precast shoe 1 of Fig. 1 together with the top end of the related anchor bolt 33.
  • the precast shoe 1 comprises a precast shoe base 2, two primary rebars 19, and one optional secondary rebar 20.
  • the rebars 19, 20 feature threads that are "roll-threaded", instead of "cut-threaded”.
  • the precast shoe base 2 has two threaded primary rebar holes 6 and one threaded secondary rebar hole 7 to receive the threads of the rebars 19, 20.
  • the anchor bolt 33 is threaded as well to receive nuts 34 and washers 35.
  • the precast shoe base 2 comprises a bolt hole 5 to receive the threaded end section of the anchor bolt 33.
  • the precast shoe 1 is fastened to the anchor bolt 33 by clamping its shoe base 2 between each one nut 34 and each one washer 35 on the anchor bolt's 33 threaded end section.
  • the threads of the rebar holes 6 and 7 and of the anchor bolt 33 are also cold forged or rolled as mentioned in the context of the rebars 19, 20.
  • Fig. 3 shows a perspective view of the precast shoe base 2 according to Fig. 2 .
  • the precast shoe base 2 is made as a monolithic part of molded ferrous material. Said ferrous material covers both iron and steel with or without alloy components, and may be formed by forging.
  • the precast shoe base 2 is a monolithic cast iron single piece having a generally flat plate shape with a front section 3 and a rear section 4. The meaning of "front” and “rear” will become apparent further below in the context of the description related to Figs. 19 and 20 .
  • the bolt hole 5 and the pair of threaded primary rebar holes 6 are located in the front section 3, while the threaded secondary rebar hole 7 is located in the rear section 4.
  • the precast shoe base 2 has a top surface 9, from which extension collars 10, 11 extend in an upward direction.
  • Each extension collar 10 functions as a length extension of each one primary rebar hole 6 including its inner thread.
  • the extension collar 11 extends the length of the secondary rebar hole 7 including its inner thread.
  • the rebar holes 6, 7 are through-holes passing through the entire thickness of the precast shoe base 2 including the extension collars 10, 11. The same applies to the respective inner threads, which extend through the entire thickness of the precast shoe base 2 including the extension collars 10, 11, thereby providing an extended thread engagement length for the respective rebars 19, 20 ( Fig. 2 , 6 ).
  • the precast shoe base 2 is provided with a thin guide plate 16 as part of its monolithic structure.
  • the guide plate 16 has a frontal positioning edge 17 and two beveled corner positioning edges 18. From the top view of Fig. 4 it can be seen, that said frontal positioning edge 17 extends perpendicular to a longitudinal axis 21 of the precast shoe base 2, while the two beveled corner positioning edges 19 are inclined thereto by 45°, encompassing an opening angle of 90° between both of them.
  • the top view according to Fig. 4 also shows, that the precast shoe base 2 extends along said longitudinal axis 21 in a mirror-symmetric fashion. Both the bolt hole 5 and the secondary rebar hole 7 are located on the longitudinal axis 21, while the two primary rebar holes 6 are symmetrically located on each side of the longitudinal axis 21.
  • the precast shoe base 2 In the vicinity of the primary rebar holes 6, the precast shoe base 2 has a first width w 1 , which is the maximum width.
  • the secondary rebar hole 7 it has a second width w 2 , which is smaller than the first width w 1 .
  • the second width w 2 is preferably less than two-thirds of the first width w 1 , and is in the shown preferred embodiment even less than 50% of the first width w 1 .
  • Figs. 3 and 4 further reveals, that the massive base body of the precast shoe base 2 excluding the thin guide plate 16 is framed in the rear section 4 by sidewalls 12 and in the front section 3 by side walls 14. Between the primary rebar holes 6 and the secondary rebar hole 7 sidewalls 12 of the front section 3 are provided with concave cutouts 13 on each side of the longitudinal axis 21. Furthermore, between the primary rebar holes 6 and the bolt hole 5 sidewalls 14 of the front section 3 are provided with concave cutouts 15 on each side of the longitudinal axis 21.
  • Fig. 5 shows in a side view the precast shoe base 2 of Figs. 2 to 4 .
  • the precast shoe base 2 has a generally flat bottom surface 8, while said top surface is not flat to provide a varying base thickness as follows:
  • the precast shoe base 2 has a first plate thickness t 1 .
  • the precast shoe base 2 has a second plate thickness t 2 .
  • the second plate thickness t 2 is smaller than the first plate thickness t 1 .
  • the top surface 9 is inclined to the flat bottom surface 8 such, that the cross-section of the precast shoe base 2 is tapered from the first thickness t 1 to the second thickness t 2 .
  • the second plate thickness t 2 is preferably less than two-thirds of the first plate thickness t 1 , and is in the shown preferred embodiment even less than 50% of the first plate thickness t 1 .
  • the guide plate 16 is significantly thinner.
  • the guide plate 16 extends from said main body in the forward direction as defined by the location of the front section 3 relative to the rear section 4.
  • the flat and planar bottom surface 8 extends under both said main body and said guide plate 16.
  • the guide plate 16 has a third plate thickness t 3 .
  • the third plate thickness t 3 is preferably less than 25% of the first plate thickness t 1 , and is in the shown preferred embodiment even less than 15% of the first plate thickness t 1 .
  • the maximum thickness of the shoe base 2 being the first thickness t 1 is significantly smaller than its maximum width being the first width w 1 .
  • the first thickness t 1 is preferably smaller than one half and even more preferable smaller than 40% of first width w 1 .
  • Fig. 6 shows a perspective view of the precast shoe 1 according to Fig. 2 in an assembled state.
  • the primary rebars 19 are screwed into the primary rebar holes 6, while the secondary rebar 20 is screwed into the secondary rebar hole 7 of the shoe base 2, thereby forming a ready-to-use precast shoe 1.
  • a higher number of primary rebars 19 and/or a higher number of secondary rebars 20 might be screwed into an appropriately adapted shoe base 2.
  • said ready-to-use precast shoe is solely formed by the single monolithic precast shoe base 2 and the rebars 19, 20 connected thereto.
  • the structural and functional integrity of the precast shoe base 2 is achieved by the afore-described monolithic design, and no further reinforcement structures are welded or otherwise connected to the shoe base 2.
  • the secondary rebar 20 is straight and oriented perpendicular to the bottom surface 8 ( Figs. 5 , 7 ) of the precast shoe base 2.
  • Fig. 7 shows in a side view a variant thereof, wherein the secondary rebar 20 is bent from its original straight form at a certain angle so as to extend in the plane of the bottom surface 8, for generating a positive locking undercut with the surrounding concrete in a cast-in state.
  • the bending angle is shown to be 90°.
  • different and/or multiple bending angles might be desirable.
  • a further variant is shown in the side view of Fig. 8 , wherein the secondary rebar 20 is kept straight, but is cut and shortened to a significant extent.
  • the secondary rebar 20 is provided with a screwed on anchor head 24 at its free end.
  • the anchor head 24 might be welded onto the secondary rebar 20 or connected thereto in any other suitable way.
  • a further and similar variant is shown in the side view of Fig. 9 , wherein the secondary rebar 20 is not made of regular endless reinforcing material, but is forged with a monolithically and one-piece formed anchor head 25.
  • the cast or forged design of the precast shoe base 2 allows for significant design freedom including one or more holding anchors being integrally or one-piece formed by the monolithic part of molded ferrous material.
  • a first example of such a design variant is shown in the side view of Fig. 10 with monolithically formed holding anchors 22 in replacement of a screwed-in secondary rebar 20 of the above described embodiments.
  • the holding anchors 22 are inclined relative to the bottom plane 8 and have an irregular form for generating a positive locking undercut with the surrounding concrete in a cast-in state.
  • a variant thereof is shown in the side view of Fig. 11 , wherein monolithically formed holding anchors 23 have a double bend relative to the bottom plane 8. In the shown example the double bend leads to a vertical and a horizontal portion of the holding anchors by means of 90° bends.
  • different bending angles and orientations of the holding anchor portions might also be desirable within the scope of the invention.
  • Fig. 12 shows in a top view the precast shoe 1 according to Fig. 11 . It can be seen that a total of two holding anchors 23 are present being aligned relative to the longitudinal axis 21 at a spreading angle.
  • the spreading angle may be chosen to any suitable value as required, including an orientation parallel to the longitudinal axis 21.
  • one single holding anchor 23 can be sufficient. Of course, three or more holding anchors 23 might be useful as well.
  • the above comments to the holding anchors 23 apply to the holding anchors 22 of Fig. 10 in an analogous way.
  • the holding anchors 22, 23 are formed to have anchor heads 29 at their free ends for the desired positive locking undercut.
  • holding anchors 28 might be formed in any other suitable way with for example hook-shaped bends as shown in Fig. 13 to provide the desired positive locking undercut.
  • the precast shoes 1 as mounted and prepared according to Fig. 6 will be positioned in a precast formwork 40, namely in the bottom formwork of the column, as mentioned before in the context of Fig. 1 , and as shown in the exploded view of Fig. 14 .
  • a total of four precast shoes 1 are positioned in the four corners of the rectangular column base cross section.
  • one removable mounting access former is provided to form a mounting recess 37 as shown in Figs. 16 to 18 during casting-in the precast shoes 1.
  • the mounting access formers are embodied in a two-part form each by a spacer former 26 and a recess former 27, and are made from foam plastic like expanded polystyrene or polyurethane. Other plastic materials or even materials like rubber, wood, steel or the like might be chosen as well.
  • the recess formers 27 have the form of a solid block.
  • the spacer formers 26 have a thin-walled L-shape, and are positioned between the respective recess formers 27 and the respective frontal positioning edges 17 of the precast shoe bases 2, as shown in the upper edge of Fig. 14 .
  • the such prepared precast formwork 40 is then filled with concrete.
  • Shape and positioning of the spacer formers 26 allow for a more or less complete immersion of the precast shoes 1 in the poured-in concrete, while the recess formers 26 are held in place by the spacer formers during pouring and displace the poured-in concrete to form mounting recesses 37.
  • the spacer formers 26 and the recess formers 27 are removed, thereby releasing a finished precast concrete structure 31 ready for assembly, as shown in Figs. 16 to 18 .
  • anchor bolts 33 In preparation of the construction site a choice of anchor bolts 33 is cast-in into the second concrete structure 32 ( Fig. 1 ), as shown in Fig. 15 .
  • the total number of (here by way of example four) anchor bolts 33 corresponds to the total number of (here by way of example four) precast shoes 1 of the related precast concrete structure 31 of Fig. 14 .
  • an anchor positioning frame 38 receives the anchor bolts 33 and positions them relative to an on-site formwork 41 of the second concrete structure 32.
  • the such prepared on-site formwork 41 is then filled with concrete, while the anchor bolts 33 are held in place by means of the anchor positioning frame 38.
  • After curing of the concrete the on-site formwork 41 and the anchor positioning frame 38 are removed, releasing a finished second concrete structure 31 ready for mounting the precast concrete structure 31, as shown in Figs. 16 to 18 .
  • Figs. 16 to 18 show phases of the aforementioned mounting process.
  • lower nuts 34 and washers 35 are positioned on the threads of the anchor bolts 33.
  • the lower washers 35 define the mounting plane for the precast concrete structure 31, and are adjusted to the desired height and horizontal orientation by turning the lower nuts 34.
  • steel shims 42 can be used for the same purpose. In this state the free threaded ends of the anchor bolts 34 are protected by protection caps 43.
  • the prepared precast concrete structure 31 is positioned above said arrangement, as shown in Fig. 16 , and is then in a next step lowered onto the washers 35 and/or the shims 42, as shown in Fig. 17 .
  • the free ends of the anchor bolts 33 are passed through the bolt holes 5 ( Fig. 6 ) of the precast shoes 1, and are accessible for the mounting personnel through the mounting recesses 37.
  • top washers 35 are passed onto said free ends, and top nuts 34 are screwed onto the same to provide a screw connection.
  • the top nuts 34 are tightened through the mounting recesses 37 by the mounting personnel, using a suitable wrench 44.
  • the entire seam area between the precast concrete structure 31 and the second concrete structure 32 may be surrounded by a finishing formwork 45 as shown in Fig. 18 , and may be filled with appropriate high-strength low-shrink mortar, which in particular fills the gap between both concrete structures and also all the mounting recesses 37.
  • the mortar can be poured either from the side or, as indicated by dotted lines, more centrally with a cast-in pour pipe.
  • Figs. 19 and 20 each show a top view of further precast concrete structures 31', 31", with a rectangular base area in Fig. 19 and a circular base area in Fig. 20 .
  • each one precast shoe 1 is positioned by aligning the beveled corner positioning edges 18 with the outer walls 36, 36' of the concrete structures 31', 31".
  • additional precast shoes 1 are placed in the middle of two opposing outer side walls 36', whereby they are positioned by aligning the frontal positioning edge 17 with the respective outer wall 36'.
  • the formwork will then be filled with concrete, whereby the precast shoes 1 will be cast-in into the concrete such, that only the portion of the bolt hole 5 is kept free from concrete, and is kept accessible for the mounting personnel.
  • the front section 3 with the bolt hole 5 is oriented towards the respective outer wall 36, 36', 36" of the respective precast concrete structure 31, 31', 31"
  • the opposing rear section 4 of the base plate 2 including the secondary rebar 2 is oriented away from the outer wall 36, 36', 36" towards the center of the precast concrete structure 31, 31', 31".
  • the precast concrete structure 31 and the second concrete structure 32 can be connected by using only the arrangement of precast shoes 1 and anchor bolts 33 according to Fig. 1 .
  • said arrangement of precast shoes 1 and anchor bolts 33 might also be used in combination with other fastening means, as shown by way of example in Fig. 21 .
  • additional grout couplers 39 are used.
  • the arrangement of precast shoes 1 and anchor bolts 33 is the same as in the embodiment of Fig. 1 .
  • both the precast concrete structure 31 and the second concrete structure 32 are provided with matching pairs of rebars 46.
  • So called grout couplers 39 in the form of metal sleeves are slid of the ends of each rebar 46 pair, and are then filled with low viscosity grout. After hardening, a high strength connection between the rebars 46 is achieved, supporting the load bearing capability of the precast shoe 1 connection.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Claims (17)

  1. Vorgefertigte Schuhbasis (2) für einen vorgefertigten Schuh (1), wobei die vorgefertigte Schuhbasis (2) einen vorderen Abschnitt (3) mit einem Schraubenloch (5) und mindestens zwei primären Bewehrungsbohrungen (6) mit Gewinde aufweist, wobei die vorgefertigte Schuhbasis (2) einen hinteren Abschnitt (4) aufweist, der gegenüber dem vorderen Abschnitt (3) liegt, wobei die vorgefertigte Schuhbasis (2) eine allgemein flache Plattenform aufweist und wobei die vorgefertigte Schuhbasis (2) eine allgemein flache Bodenfläche (8) aufweist, dadurch gekennzeichnet, dass die vorgefertigte Schuhbasis (2) im vorderen Abschnitt (3) neben dem Schraubenloch (5) eine erste Plattendicke (t1) und im hinteren Abschnitt (4) eine zweite Plattendicke (t2) aufweist, die kleiner ist als die erste Plattendicke (t1), wobei der Querschnitt der vorgefertigten Schuhbasis (2) von der ersten Dicke (t1) neben dem Schraubenloch (5) zu der zweiten Dicke (t2) im hinteren Abschnitt (4) verjüngt ist, wobei die vorgefertigte Schuhbasis (2) als ein monolithischer Teil aus gegossenem Eisenmaterial hergestellt ist.
  2. Vorgefertigte Schuhbasis nach Anspruch 1,
    dadurch gekennzeichnet, dass der hintere Abschnitt (4) mit mindestens einer sekundären Bewehrungsbohrung (7) mit Gewinde versehen ist.
  3. Vorgefertigte Schuhbasis nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass der hintere Abschnitt (4) mit mindestens einem Halteanker (22, 23, 28) versehen ist, der durch den monolithischen Teil aus gegossenem Eisenmaterial integral ausgebildet ist.
  4. Vorgefertigte Schuhbasis nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass die vorgefertigte Schuhbasis (2) eine obere Oberfläche (9) aufweist, und wobei die obere Oberfläche (9) mit Verlängerungskragen (10, 11) versehen ist, die die Bewehrungsbohrungen (6, 7) mit Gewinde umgeben.
  5. Vorgefertigte Schuhbasis nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet, dass die zweite Plattendicke (t2) weniger als zwei Drittel und insbesondere weniger als 50% der ersten Plattendicke (t1) beträgt.
  6. Vorgefertigte Schuhbasis nach einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, dass die vorgefertigte Schuhbasis (2) in der Nähe der primären Bewehrungsbohrungen (6) eine erste Breite (w1) und in der Nähe der sekundären Bewehrungsbohrung (7) eine zweite Breite (w2) aufweist, die kleiner ist als die erste Breite (w1).
  7. Vorgefertigte Schuhbasis nach Anspruch 6,
    dadurch gekennzeichnet, dass die zweite Breite (w2) weniger als zwei Drittel und insbesondere weniger als 50% der ersten Breite (w1) beträgt.
  8. Vorgefertigte Schuhbasis nach einem der Ansprüche 1 bis 7,
    dadurch gekennzeichnet, dass zwischen den primären Bewehrungsbohrungen (6) und der sekundären Bewehrungsbohrung (7) Seitenwände (12) der vorgefertigten Schuhbasis (2) mit konkaven Ausschnitten (13) versehen sind.
  9. Vorgefertigte Schuhbasis nach einem der Ansprüche 1 bis 8,
    dadurch gekennzeichnet, dass zwischen den primären Bewehrungsbohrungen (6) und dem Schraubenloch (5) Seitenwände (14) der vorgefertigten Schuhbasis (2) mit konkaven Ausschnitten (15) versehen sind.
  10. Vorgefertigte Schuhbasis nach einem der Ansprüche 1 bis 9,
    dadurch gekennzeichnet, dass in ihrem vorderen Abschnitt (3) die vorgefertigte Schuhbasis (2) mit einer Führungsplatte (16) versehen ist, die eine frontale Positionierungskante (17) der vorgefertigten Schuhbasis (2) bildet.
  11. Vorgefertigte Schuhbasis nach Anspruch 10,
    dadurch gekennzeichnet, dass die Führungsplatte (16) mindestens eine und vorzugsweise zwei abgeschrägte Eckpositionierungskanten (18) der vorgefertigten Schuhbasis (2) aufweist.
  12. Vorgefertigte Schuhbasis nach Anspruch 10 oder 11,
    dadurch gekennzeichnet, dass die Führungsplatte (16) eine dritte Plattendicke (t3) aufweist und dass die dritte Plattendicke (t3) weniger als 25% und insbesondere weniger als 15% der ersten Plattendicke (t1) beträgt.
  13. Vorgefertigte Schuhbasis nach einem der Ansprüche 1 bis 12,
    dadurch gekennzeichnet, dass der monolithische Teil des gegossenen Eisenmaterials Eisenguss oder Stahlguss ist.
  14. Vorgefertigter Schuh, umfassend eine vorgefertigte Schuhbasis (2) nach einem der Ansprüche 1 bis 13 und mindestens zwei separate primäre Bewehrungsstäbe (19), die mit Gewinde versehen sind, um den primären Bewehrungsbohrungen (6) mit Gewinde der vorgefertigten Schuhbasis (2) zu entsprechen.
  15. Vorgefertigter Schuh nach Anspruch 14,
    dadurch gekennzeichnet, dass der hintere Abschnitt (4) der vorgefertigten Schuhbasis (2) mit mindestens einer sekundären Bewehrungsbohrung (7) mit Gewinde versehen ist und dass der vorgefertigte Schuh (1) weiterhin mindestens einen separaten sekundären Bewehrungsstab (20) aufweist, der mit Gewinde versehen ist, um der sekundären Bewehrungsbohrung (7) mit Gewinde der vorgefertigten Schuhbasis (2) zu entsprechen.
  16. Vorgefertigter Schuh nach Anspruch 14 oder 15,
    dadurch gekennzeichnet, dass die Gewinde der Bewehrungsbohrungen (6, 7) und/oder der Bewehrungsstäbe (19, 20) gewalzte Gewinde sind.
  17. Vorgefertigter Schuh nach einem der Ansprüche 14 bis 16,
    dadurch gekennzeichnet, dass ein abnehmbarer Einbauausnehmformer bereitgestellt ist, um beim Eingießen des vorgefertigten Schuhs (1) eine Einbauaussparung (37) auszubilden, wobei der Einbauausnehmformer in einer zweiteiligen Form durch einen Distanzformer (26) und einen Ausnehmformer (27) ausgeführt ist und wobei der Distanzformer (26) zwischen dem Ausnehmformer (26) und der frontalen Positionierungskante (17) der vorgefertigten Schuhbasis (2) positioniert ist.
EP22714829.3A 2022-03-15 2022-03-15 Vorgefertigte schuhbasis und vorgefertigter schuh Active EP4493770B1 (de)

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US20240368889A1 (en) * 2023-05-04 2024-11-07 Erico International Corporation Connection System for Concrete Sections
CN117166611A (zh) * 2023-11-03 2023-12-05 享城科建(北京)科技发展有限公司 柱底连接系统和预制柱
WO2025224590A1 (en) * 2024-04-22 2025-10-30 Carlo Calisse Column shoe, buffer, reinforced connection, method for making a column
TWI912870B (zh) * 2024-08-08 2026-01-21 潤弘精密工程事業股份有限公司 調整治具及其使用方法

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