Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
  • E04G21/14—Conveying or assembling building elements
  • E04G21/142—Means in or on the elements for connecting same to handling apparatus

Definitions

• the present invention relates to an anchoring intended in particular, but not exclusively, for reinforced concrete panels and pipes.
• a first object of the invention is to propose new fixing possibilities for any anchor: tear-off cone, grip anchor, eye anchor, etc. and to allow the positioning, in any suitable place, of an anchor in a thin concrete panel, whatever the distribution of the reinforcements in this panel.
• reinforced concrete pipes are used for large pipes and some are poured with internal longitudinal and circular or helical reinforcement, welded and regularly distributed in the wall of the pipe.
• anchors allowing lifting and transport using devices such as cranes.
• Such anchors used during installation, avoid the use of clamps or handling slings capable of altering the external surface of the pipes.
• eye anchors in which an orifice allows the passage of a frame, are difficult to use.
• a second object of the invention is to remedy this problem.
• a third object of the invention is to avoid the formation of cracks.
• the anchor for reinforced concrete comprising an anchor head having means of connection with a lifting device and a rod is characterized in that it ends, at its lower part by a body split longitudinally followed by a foot with a transverse dimension greater than that of the stem.
• the anchor according to the invention can be easily positioned on a frame which it overlaps and, after casting, have the characteristics of an anchor with tearing cone because of the dimensions of its foot parallel to the surface.
• the anchor is secured to the frame it overlaps or to adjacent frames by one or more ligatures or springs or clips.
• the anchor for reinforced concrete comprising an anchor head having means of connection with a lifting device, a rod and a body split longitudinally, ending in a foot projecting from the lower part of the rod is characterized in that the body has at least one projecting lateral ear shaped with grooves of semi-circular section capable of receiving irons connecting with the reinforcements.
• the slot is of a width substantially equal to the diameter of the frames.
• the anchor can be positioned between the reinforcements and of course even when there are no reinforcements.
• the anchor head can be arbitrary, provided that it can be gripped by a lifting device. It can be either a cylindrical head, a socket or threaded rod, or a simple hole in a flat rod.
• a retaining spring is mounted between the base of the anchor and at least one frame.
• the anchor is positioned for example on a longitudinal reinforcement and maintained, during the pouring of the concrete, by the action of the spring which is compressed between, on the one hand, the foot or the body of the anchor and, on the other hand, one or two adjacent circular frames.
• a perforated screen is interposed between the inside of the pipe and the anchor.
• the screen can be connected to said retaining spring, and at least partially surround the foot of the anchor.
• the concrete-metal bond forms a liquid seepage conduit causing the oxidation of the metallic parts and in particular of the anchors.
• the present invention is based on the idea that the introduction of a screen prevents the liquid from passing from the inside of the pipe to the outside of the latter, in a radial direction, at the anchorages by transforming the cracks into micro cracks.
• This screen is preferably made up of steel wire mesh constituting a fine mesh grid or holes drilled in a plate whose diameters are substantially equal to the particle size of the concrete. This creates an area of tight micro cracks, which prevents the formation of non-tight cracks.
• the anchor can be mounted, not on the reinforcements, but on a spacer resting on the bottom of the formwork, during the pouring of the pipe.
• the anchoring is thus independent of the presence or absence of reinforcements.
• FIG. 5 an anchor according to the invention mounted on a frame
• the anchor with a plane of symmetry, comprises a substantially cylindrical head 1 which can be grasped by a lifting device (not shown), by means of appropriate equipment.
• a cylindrical rod 2 of variable length depending on the anchoring to be carried out continuing with a body 3 which, according to a characteristic of the invention has a slot 9 intended to receive a frame that 'it straddles by means of said slot.
• the body 3 ends with a foot 4 which is larger in diameter than the head and the rod and which is intended to cause the formation of an anchoring cone when a force is exerted on the anchor.
• Figure 2 shows the same anchor in position inside a concrete casting mold (not shown).
• the anchor 1 overlaps the longitudinal reinforcement "B".
• a spring 12 is disposed between the leg 4 and the circular frames "A".
• a screen 13 is advantageously provided below the anchor which, in the example shown, surrounds the base of the anchor and is connected by its edges 14 to the contact points between the spring 12 and the circular armatures A. Any other fixing means can, of course, be used.
• the screen consists of a screen whose mesh allows the passage of liquid concrete, that is to say is adapted to the particle size of the aggregate which is mixed with cement and very fine sand. .
• screen 3 is flat, but it can take any other form and more or less wrap the anchor.
• the anchor can, moreover, be protected from external humidity by a prefabricated plug of cement stuck in the reservation surrounding the head (not shown).
• the spring 12 is mounted in compression between the upper surface of the leg 4 and two adjacent circular frames A and arranged on either side of the anchor.
• the spring 12 rests on the one hand on the surface 4 and, on the other hand. against the underside of the reinforcements A. Thus, by its elasticity, it exerts a permanent pressure on the surface 4 which keeps the anchor vertical , against any stress either vertical or lateral.
• the spring 12 consists of two loops formed from a single elastic wire. The two ends of this wire are not welded which allows easy mounting on the foot of the anchor.
• the anchor can be positioned on a longitudinal reinforcement and work with the tearing cone. However, it is possible to mount such an anchor, either between the reinforcements and without contact with them, or in the absence of reinforcements.
• the anchor can also work by adhesion to concrete. A spacer is in this case mounted in the bottom of the formwork.
• two ears 5 protrude from the body 3 and have at the top and / or bottom grooves 6 for fixing the anchor, either on an iron, or under another iron.
• Figure 4 is a sectional view along the line IV-IV of Figure 1. It shows that the foot 4 protrudes beyond the body 3 to create a large tearing cone since it is the shape and the surface of the foot of the anchor which determine the volume of the tearing or breaking cone.
• Figures 5 to 7 show, in front view, side and top, an anchor according to the invention, in position on a frame B, connected to two frames A perpendicular to the frame B.
• the anchor overlaps the reinforcement B by insertion into the slot 9.
• this assembly does not have the stability necessary for satisfactory maintenance during the pouring of the concrete.
• it is connected by steel wires F, working in bending-compression, the diameter may be 2.5 to 3.5 mm, for example, at perpendicular reinforcement A, the reinforcement A and B constituting, very frequently a trellis (if not, they must be tied).
• the positioning wires F at the time of lifting, contribute, by adhesion to the concrete, to increase the anchoring capacity.
• the wires F suppress the rules or supports resting on the edges of the formwork, serving to maintain or suspend the anchor, hence saving investment and eliminating significant labor time before each operation of concreting and demolding.
• FIG. 7 represents a first possible mounting seen from above corresponding to the example of FIG. 3.
• Two wires F are supported in the grooves 6 of the ears 5, pass under two parallel frames A.
• the anchor is held by the frame B by the wires F which bear in the grooves 6 and under the frames A.
• Figure 8 shows another variant seen from above.
• the hairpin is positioned between two parallel frames A1 and A2.
• the wire F passed under the ears 5, under the frame A1 and on the frame A2. It is tied in 8 on the A frames and in 18 on the ears 5.
• the anchor can be positioned on a longitudinal reinforcement and work with the tearing cone.
• the anchor can also work directly with reinforcements adhering to the concrete.
• the ears 5 provided for fixing the anchor can also be used to position reinforcing bars using the principle of anchoring by adhesion if it is desired to increase the anchoring capacity.
• FIGS. 9 and 10 schematically represent an anchor according to the invention with complementary reinforcements C using only the adhesion to concrete.
• Ears 5 such as those which have just been described can be used with any anchors. In this case, they are advantageously mounted on a piece of suitable shape which can be fixed on the anchor.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Mechanical Engineering (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Reinforcement Elements For Buildings (AREA)
• Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Applications Claiming Priority (5)

Publications (1)

Family

ID=26229742

Family Applications (1)

Country Status (3)

Families Citing this family (2)

Family Cites Families (9)

• 1993
  • 1993-09-24 WO PCT/FR1993/000934 patent/WO1994006983A1/fr not_active Ceased
  • 1993-09-24 AU AU48240/93A patent/AU665671B2/en not_active Ceased
  • 1993-09-24 EP EP93920929A patent/EP0615570A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events