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
  • E04B1/38—Connections for building structures in general
  • E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
  • E04B1/4114—Elements with sockets
• • 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
  • E04B1/02—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements
  • E04B1/04—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements the elements consisting of concrete, e.g. reinforced concrete, or other stone-like material
  • E04B1/043—Connections specially adapted therefor
• • 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
  • E04B1/38—Connections for building structures in general
  • E04B1/383—Connection of concrete parts using adhesive materials, e.g. mortar or glue
• • 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
  • E04B1/38—Connections for building structures in general
  • E04B1/48—Dowels, i.e. members adapted to penetrate the surfaces of two parts and to take the shear stresses
  • E04B1/483—Shear dowels to be embedded in concrete
• • 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
• • 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

• Said cover cap has a length greater than a distance between the first precast element and the second precast element for covering the portion of the rebar between the gap of the two precast elements to form strong uniform bond throughout the length of the bar, including the gap between the precast elements.
• FIG. 1 illustrates a cross sectional view of a system of joining precast elements having connection sleeves in accordance with an embodiment of the present invention
• FIGS. 2A and 2B illustrate a perspective view and front view of a first connection sleeve of FIG. 1 placed in the precast element of the system in accordance with an embodiment of the present invention
• FIGS.3 A and 3B illustrate a perspective view and front view of a second connection sleeve of FIG. 1 placed in the precast element of the system in accordance with an embodiment of the present invention
• FIG. 4 illustrates a perspective view of joined connection sleeves of the system of FIG. 1 in accordance with an embodiment of the present invention
• FIG. 5A illustrates an exploded view of first connection sleeve of the system of FIG. 2A and 2B in accordance with an embodiment of the present invention
• connections between components and/or modules within the figures are not intended to be limited to direct connections. Rather, these components and modules may be modified, re-formatted or otherwise changed by intermediary components and modules.
• references in the present disclosure to “one embodiment” or “an embodiment” mean that a particular feature, structure, characteristic, or function described in connection with the embodiment is included in at least one embodiment of the invention.
• the appearances of the phrase “in an embodiment” or “in an implementation” in various places in the specification are not necessarily all referring to the same embodiment or implementation.
• FIG. 1 a system (300) for joining precast elements in accordance with an embodiment of the present invention is shown.
• the precast elements to be joined with each other include at least two precast elements i.e. a first precast element (100) and a second precast element (200).
• the system (300) includes at least one first connection sleeve (10) placed at a predefined location in the first precast element (100) and at least one second connection sleeve (20) placed at a predefined location in the second precast element (200). It is understood here that number of the first and second sleeves (10, 20) may vary as per the height and size of the precast elements (100, 200). In accordance with the present invention, it is understood here that in case of more than two precast elements (100, 200) are joined with each other, the precast element positioned between the two elements includes both the first and second sleeves (10, 20) placed therein.
• the first connection sleeve (10) is positioned in the first precast element (100) and the second connection sleeve (20) is positioned in the second precast element (200).
• a rebar (30) is movably positioned inside the first connection sleeve (10). The rebar (30) is movable from the first connection sleeve (10) to the second connection sleeve (20) for joining the first precast element (100) to the second element (200).
• the first and second connection sleeves (10, 20) include an aligner plate (11, 21) attached at first end portions of the first connection sleeve and second connection sleeve (10, 20).
• the connection sleeves (10, 20) include at least one support plate or holdfast (12, 22) passing through the connection sleeves (10, 20).
• the support plate (12, 22) has at least one holder (122, 222) configured thereto. The support plate (12, 22) is turned and moved along the spiral threading of the connection sleeves (10, 20) up to the desired location.
• At least one engaging link (15, 25) engages the first connection sleeve (10) and second connection sleeve (20) pass through the holder (122, 222) of the support plate (12, 22) for engaging the connection sleeves (10, 20) with the inner frame (50).
• a holding frame (14, 24) are fixed to the inner frame (50) of the precast elements (100, 200).
• the engaging link (15, 25) passes through the holder (122, 222) of the support plate (12, 22) and engages into the holding frame (14, 24).
• connection sleeves (10, 20) secures the connection sleeves (10, 20) and transfer tensile/ bending/ shear stress of the connection sleeves (10, 20) to the inner frame (50) of the precast elements (100, 200).
• first connection sleeve (10) and the second connection sleeve (20) can be directly connected to the inner frame (50) also.
• a sensing indicator (16) is removably connected at a second end of the connection sleeve (10) and (20).
• the sensing indicator (16) is a hollow element having an opening (160).
• the hollow body includes a ball (162) having a diameter larger than the diameter of the opening (160).
• the sensing indicator (16) indicates completion of the grout fdling process in connection sleeves (10) after moving the rebar (30) from the first connection sleeve (10) to the second connection sleeve (20) and acts as an inbuilt shuttering system. As the grout completely fills the sensing indicator (16), the ball (162) moves towards the opening (160) and blocks the opening (160) thereby indicating completion ofthe grout filling process.
• the first connection sleeve (10) comprises an aligner plate (11) attached at first end portion of the first connection sleeve (10), the aligner plate (11) has an access hole (110) for accessing the bar (30); and at least hole is configured on the surface of the first connection sleeve (10) at second end portion thereof.
• the First connection sleeve (10) includes at least one support plate (12) passes therethrough. The support plate (12) facilitates engagement of the at least one engaging link (15) with the inner frame (50) thereby securing the connection sleeves (10) and transferring tensile/ bending/ shear stress of connection sleeves (10) to the inner frame (50) of the precast elements (100).
• a rebar (30) is movably positioned inside the first connection sleeve (10).
• the inner surface of the aligner plate (11) has a protrusion for keeping the rebar (30) at slightly elevated location while moving from the first connection sleeve (10) to the second connection sleeve (20).
• the second connection sleeve (20) comprises an aligner plate (21) attached at first end portion thereof; and at least hole configured on the surface of the second connection sleeve (20) at second end portion of thereof.
• the second end of the connection sleeve (20) includes a sensing indicator (26) removably connected thereto.
• the sensing indicator (26) is attached to the connection sleeves (10, 20) by an another tube attached to the end portions of the connection sleeves (10, 20).
• the sensing indicator (26) indicates completion of the grout filling process in connections sleeves (20).
• the sensing indicator (26) is a hollow element having an opening (260).
• the hollow body includes a ball (262) having a diameter larger than the diameter of the opening (260).
• the sensing indicator (26) indicates completion of the grout filling process in second connections sleeve (20) after moving the rebar (30) from the first connection sleeve (10) to the second connection sleeve (20) and acts as an inbuilt shuttering system.
• the second connection sleeve (20) includes the support plate (22) passes therethrough.
• the support plate (22) facilitates engagement of the at least one engaging link (25) with the inner frame (50) thereby securing the connection sleeves (20) and transferring tensile/ bending/ shear stress of connection sleeves (20) to the inner frame (50) of the second precast elements (200).
• At least one of the first and second connection sleeves (10, 20) and preferably the second sleeves includes a cover cap (60) slidably positioned therein.
• the cover cap (60) has a cylindrical hollow body with a collar (61) at one end portion thereof and has a length greater than the gap between the two adjacent precast elements. It is understood here that the cover cap (60) has a profile matching the profile of the second connection sleeve (20).
• the cover cap (60) includes at least one through hole (62) positioned thereon at a predefined location.
• the cover cap (60) covers the portion of the rebar (30) between the gap (40) of the two precast elements ( 100, 200).
• the cover cap (60) positioned in the second connection sleeve (20) is moved from the second connection sleeve (20) towards the first connection sleeve (10).
• the cover cap (60) touches the aligner plate (11) of the first connection sleeve (10) a hollow space gets formed between the rebar (30) and the inner profile of the cover cap (60) which gets filled by the grouting material that enters the hollow space through the though hole (62) while filling the grouting material in the gap (40).
• the present invention provides a method for joining two precast elements.
• a first precast element (100) having a first connection sleeve (10) and a second precast element (200) having a second connection sleeve (2) are positioned opposite to each other having a gap (40) therebetween such that an aligner plate (11) of first connection sleeve (100) and an aligner plate (21) of second connection sleeve (200) are aligned with each other.
• a rebar (30) positioned in the first connection sleeve (10) is moved to the second connection sleeve (20) upto a predefined location in the second connection sleeve (20).
• the cover cap (60) is moved from the second connection sleeve (20) towards the first connection sleeve (10) such that the collar (61) of the cover cap (60) touches side of the adjacent precast element the aligner plate (11) of the first connection sleeve (10).
• a mix of grouting material is introduced in the gap (40). The grout mix is introduced from top side of the elements in the gap (40).
• the grout fills the bottom portion of the gap (40) and then moves into the first connection sleeve (10) and the second connection sleeve (20) by moving in upward direction against gravity. In this step, the grouting material also enters the hollow space between the rebar (30) and the cover cap (60) through the through hole (62). In the next step, the first and second connection sleeves (10, 20), the hollow space between the rebar (30) and the cover cap (60) and gap (40) completely filled with grout are let dry. After drying, the grout hardens and forms a strong bond with the rebar (30) and the sleeves (10, 20) and cover cap (60) thereby joining the precast elements (10, 20).
• the present invention provides a method for manufacturing precast elements (100, 200), the method comprising the steps of: preparing an inner frame (50) by fixing vertical and horizontal bars in a mould plate of the precast element ( 100, 200); marking center points for positioning at least one first connection sleeve (10) and/or at least one second connection sleeve (20) in the mould plate; placing the connection sleeves (10, 20) in the inner frame (50) at the pre-defined positions; fixing the connection sleeves (10, 20) to the inner frame (50); fixing a plug (112; 212) on the mould plates by nut bolt/ magnet/ welding; positioning the first and second connection sleeves (10, 20) pre-fixed with the aligner plates (11, 21) in the precast element; placing a tube over the access hole (110) of the first connection sleeve (10) to access the bar from the outer surface of the precast elements (100, 200); placing another tube over the second end of the connection sleeves (10, 20) for connecting sensing indicator (16, 26); attaching duct tape over the various joints
• fixing the connection sleeves (10, 20) to the inner frame (50) comprises the following steps: positioning at least one support plate (12, 22) through the connection sleeves (10, 20); and passing the engaging link (15, 25) through a holder of the support plate ( 12, 22) and the inner frame (50) thereby fixing the connection sleeves (10, 20) to the inner frame (50).
• the distance between the two consecutive connection sleeve (10, 20) depends on structural design requirement, approximately it can be from 100mm c/c to 750mm.
• the rebar (30) is moved from the first connection sleeve (10) into second connection sleeve (20) by the driving mechanism through an access hole (110) or by a wire.
• the rebar (30) is moved into the second connection sleeve (20) such that half portion of the rebar (30) remains in the first connection sleeve (10) and half portion of the rebar (30) remains in the second connection sleeve (20).
• the grouting material is introduced in the gap (40) till it is expelled from the at least one hole configured on the connection sleeves (10, 20) or till the sensing indicators (16, 26) attached at a second end portion of the connection sleeves (10, 20) indicate complete filling of the first connection sleeve (10) and the second connection sleeve (20).
• a connection bay can be defined as when viewed in cross section, (FIG. 1) the portion between inner frame (50) in which a connection sleeve is planned for and that a minimum clear distance is to be maintained inside a connection bay.
• links/ ties or both it is tied to the main bars on outer faces of the master stirrups which define that connection bay.
• the links/ ties be tied inside of the connection bay.
• the tie the links/ ties are tied on the upper face of the top master ring of the connection bay and on the bottom face of the lower master ring of the connection bay.
• the diameter of the master ring or link/ ties This may be as per the structural designer’s calculation.
• Non-Connection Bays are those portions in the cross section of the wall, between any two successive master stirrups in which connection sleeves are not planned or are absent. Neither is there any specification for minimum clear distance inside these bays nor is there any requirement of tying the links/ ties on the outer face of the master rings, etc.
• a specially designed key is inserted into the access opening cum grout outlet and attached to the drive mechanism on one end and the other end of the key is attached to the drive device.
• the key also rotates and therewith the main drive wheel of the gear is also set into rotation, thereby again setting the connecting bar into a translation motion therefore moving itself from donor to receptor. While in motion, the bullet shaped nosing design goes smoothly along the inside of the receptor without obstructions.
• the bar of the required length is passed till the colored marking is seen in the gap, which determines successful stage completion.
• a specially designed adhesive is sprayed on each wall side and on a fabric/ thin steel plate and for the same width for the height of 2m of the wall and then after waiting for a predetermined time, the fabric/ steel sheet is applied on the wall at the gap and followed by grouting.
• the fabric/ thin steel plate is removed, and buffing/ grinding is done in order to make the joint look clean.
• the usage of sprayable adhesive together with fabric/thin steel sheet also takes care that no leakage takes place from the joint even if there are offsets between the walls, which is a very difficult to achieve in conventional shuttering and also, the adhesive and the fabric/ thin steel sheet is sufficient to take the load of the grout head.
• the system (300) of the present invention consumes the least amount of grout within Tolerance limits to avoid chances of mismatch.
• the system of the present invention requires the least count of holes openings on the finished wall surface.
• the system can be used in horizontal as well as vertical casting and left-right compatible design due to rotatable grout outlets and T shaped emergency access hole. This system is compatible for any thickness of wall from 150mm to 400mm or even beyond.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Reinforcement Elements For Buildings (AREA)
• Joining Of Building Structures In Genera (AREA)

Applications Claiming Priority (4)

Publications (1)

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• 2023
  • 2023-09-18 JP JP2025516129A patent/JP2025529534A/ja active Pending
  • 2023-09-18 WO PCT/IN2023/050867 patent/WO2024057343A1/en not_active Ceased
  • 2023-09-18 EP EP23864932.1A patent/EP4587656A1/de active Pending

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