JP5202926B2 - Sleeve driven post-installed anchor - Google Patents

Description

  According to the present invention, a sleeve is inserted into an anchor hole formed in a concrete frame by a carbide drill or the like in a state where the anchor main body and the sleeve are combined with each other, and then the sleeve is driven along the axis of the anchor main body. A sleeve that is partly expanded by an expansion forcing part provided in the anchor body, is bitten into the inner wall of the anchor hole and is fixed, and is applied as an anchor for supporting various equipment such as a separator on the concrete frame This is related to a post-installation anchor.

  An anchor body with a metal tube processed and a conical widened portion that gradually increases in diameter as it reaches the distal end, a threaded portion inside the tube that is narrowed to a small diameter at the rear end, and a conical shape of the anchor body Pins that are inserted and fixed inside the expanding portion, and have a structure comprising a sleeve provided with a plurality of slits on the distal end side at the outer periphery of the anchor main body (for example, Patent Document 1), or on the expanding portion of the anchor By continuously forming the corrugated spiral part on the slits and the outer peripheral surface, the widened part can be intimately crimped to the irregularities on the perforated side of concrete, etc., ensuring stable tensile performance There is a configuration (for example, Patent Document 2) that can be used.

Japanese Utility Model Publication No.59-20505 Japanese Utility Model Publication No.59-63209

  As described above, the sleeve driven post-installed anchor has an anchor hole formed in the concrete frame with a carbide drill, etc., and the anchor body and the sleeve are combined and inserted into the anchor hole, and the rear end of the sleeve is struck. When the sleeve is struck and driven, the tip of the anchor body abuts against the inner wall of the anchor hole and receives a reaction force from the inner wall. Advances along the anchor body, and at the same time, the distal end side of the sleeve expands, bites into the inner wall of the anchor hole, and functions as an anchor.

  The anchor hole provided in a predetermined position of the concrete frame in advance depends on, for example, wear of the cutting edge due to long-term use of a cemented carbide drill, an operator's work conditions (such as a scaffold), a bar arrangement inside the concrete frame, or the like. It may be formed in a zigzag shape with respect to the shaft core. As a result, a portion where the anchor hole becomes smaller than a predetermined diameter as a reference is generated.

  However, in the conventional example, the latter has a conical widened portion of the anchor body formed of a solid body, and the former also has an inside of the conical widened portion for forcedly expanding the sleeve. The pin is inserted and fixed for reinforcement, so it is structurally solid. (When the sleeve is driven, the tip is bent outward using the plastic deformation of the sleeve and bites into the anchor inner wall. For this reason, since the rigidity of the conical widened portion is high, the sleeve easily breaks the side wall of the anchor hole during the insertion of the anchor hole, and stress is locally applied. As a result of concentration, stable fixing strength may not be obtained. Furthermore, if the crushing powder generated when pressed against the back wall with irregularities in the anchor hole or the cutting powder and clumps due to insufficient cleaning remain at the tip surface position as they are, the back wall remains stable. It is difficult to abut against the above-mentioned reaction force, and the expansion of the sleeve tip side and the biting function to the side wall of the anchor hole due to the expansion may be reduced.

  This is the same even if the anchor hole is formed as prescribed, that is, the chip removal operation by the blower or the like performed before setting (inserting) the anchor body into the anchor hole is incomplete. In some cases, the reaction force cannot be obtained by the cutting powder.

  The present invention eliminates the drawbacks of the conventional example, and can obtain a relatively stable reaction force from the inner wall of the anchor hole when the anchor hole is driven into the sleeve. The present invention was devised for the purpose of providing a sleeve driving type post-installed anchor in which the expanding operation of the piece is surely performed and bitten into the anchor hole wall.

Threaded portion for attaching the separator other equipment to a cylindrical anchor body which is provided to the rear end, and gradually enlarged toward the tip side from the middle portion of the anchor body, the hollow widening force portion for expanding the sleeve provided Rutotomoni, the tip of the anchor body, was continuously hollow expanding force unit by drawing, the distal end opening portion consisting of the inner flange-like tip piece is provided, the tip piece of the tip opening A taper shape is formed so as to gradually protrude forward from the base portion to the front end portion on the inner peripheral edge side , and a plurality of slits along the axis line are provided at the distal end of the sleeve that is externally fitted to the anchor body from the rear end side. It is set as the structure arranged in parallel with the side direction.

As described above, the present invention is the one in which the distal end opening side of the anchor body is a hollow expansion forcing portion of the sleeve, so even if the expansion portion contacts the hole wall inner surface in the middle of driving the sleeve, The expansion forcing part is elastically deformed to prevent interruption of the forward movement due to the contact, and the work can be performed, and an equal reaction force can be obtained from the inner surface of the hole wall. And can be securely fixed to the anchor hole wall.

In addition, the crushing powder and cutting powder existing in the anchor hole deep wall position can flow into the hollow body through the tip opening, and the leading edge (ring shape) of the anchor body is stably pressed against the anchor hole deep wall by the inflow. Therefore, the sleeve side reliably receives the reaction force from the back wall side, and performs advancement along the anchor body, expansion of the anchor body portion partitioned by the slit, and biting of the anchor hole side wall accordingly. Can be made. In addition, the tip of the anchor body is provided with an inner flange-shaped tip portion that is drawn and continued to the expansion forcing portion, and the tip opening portion is configured by the tip portion piece. Since the rib effect is achieved, the plastic deformation can be prevented without increasing the wall thickness, the elastic deformation function can be ensured, and the sleeve can be sufficiently expanded.

Furthermore, by forming the tip piece into a tapered shape that gradually protrudes forward from the base portion to the tip portion on the inner peripheral edge side, the tapered surface of the inner wall of the anchor hole when formed as expected with a carbide drill The tip end piece can be stably brought into contact with (formed by the drill), and therefore the sleeve can be driven smoothly .

  The drawings show an embodiment of a sleeve driving type post-installation anchor according to the present invention, FIG. 1 is a front view, FIG. 2 is a partially cutaway front view, FIG. 3 is a front view before construction, and FIG. FIG. 5 is a front view showing one example of use, and FIG. 6 is a partially cutaway front view of the second embodiment.

  A sleeve driving type post-installed anchor (hereinafter simply referred to as an anchor) A according to the present invention is constituted by combining an anchor body 1 and a sleeve 2 formed by secondary processing of steel pipes.

  The anchor main body 1 is a cylindrical body in which an expansion forcing portion 3 that gradually increases in diameter from the intermediate portion in the axial direction to the distal end opening 1a is provided on the distal end side, and a female screw 4a is provided on the narrow diameter portion 4 on the rear end side. The tip of the widening forcing portion 3 is constituted by a maximum aperture portion, and is provided with an inner collar-like tip portion piece 5 so as to be continuous with the forcing expansion portion 3 by drawing. The portion 1a is configured, and the tip piece 5 is tapered (inclined) so as to gradually protrude forward from the base on the outer peripheral edge side to the tip on the inner peripheral edge side. It is preferable that the inclination angle of the tip opening 1a be an angle of a conical portion formed at the bottom of an anchor hole formed by a carbide drill, generally close to 120 °.

  The sleeve 2 is provided with a circular sawtooth groove 6 having a cross section or a sawtooth shape arranged in parallel along the axis on the peripheral side portion on the front end side, and a slit 7 across the annular groove 6 portion is arranged in the peripheral direction in the front end. It is made of a provided cylindrical body, and is easily expanded (bent) and deformed by the branching piece 2a formed by the presence of the slit 7 and several annular grooves 6 of each branching piece 2a.

  Then, the sleeve 2 is fitted to the anchor body 1 from the rear end side, and the anchor body 1 and the sleeve 2 are combined to form an anchor A from the rear end side. The anchor A is made of concrete as shown in FIG. Fit into the anchor hole C drilled in the housing B with a hard drill or the like and set. Next, as shown in FIG. 4, when the rear end of the sleeve 2 is struck by an appropriate means such as a hammer, the tip end piece 5 of the anchor body 1 is pressed against the inner wall Ca of the anchor hole C and the reaction force is applied to the sleeve 2. As a result, the sleeve 2 advances in the direction of the back wall Ca along the axis of the anchor main body 1 fitted therein.

  In addition, the concrete frame B has a state in which the anchor hole C is formed (the anchor hole C shown in the figure is a carbide drill due to deterioration of the function of the blade edge due to the quality and arrangement of the concrete components, wear due to long-term use of the carbide drill, etc.) Even when the sleeve 2 is hit from the wall surface of the anchor hole C to generate crushing powder, the crushing powder is narrowed between the anchor body 1 and the back wall Ca. It is pressed and pushed out and flows into the anchor main body 1 through the front end opening 1 a, and the front end piece 5 of the anchor main body 1 reliably presses against the back wall Ca and transmits the reaction force to the rear end of the sleeve 2.

The sleeve 2 is provided with slits 7 in such a manner that the advancement along the axis of the anchor main body 1 leads to the expansion forcing part 3 provided in the anchor main body 1 and the diameter gradually increases as it reaches the tip of the expansion forcing part 3. The bifurcated piece 2a of the sleeve 2 formed by is expanded, touches the side wall Cb of the anchor hole C, bites, and locks as the sleeve 2 advances, and the anchor A is fixed to the concrete frame B. Construction of anchor A is completed.

  After the construction of the anchor A, as shown in FIG. 5, the screw 4a portion on the rear end side of the anchor body 1 (in the embodiment, it is a female screw, but it may be a male screw. The separator 10 may be screwed and connected to the mold 11 to attach the mold 11, the butter 12 is applied to the back of the mold 11, the connecting bolt 13, the washer 14, and the nut 15. The other side of the separator is connected and tightened with a fastener.

Front view. Partially missing front view. The front view of the state before construction. The front view of the state after construction. The front view which shows one usage example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anchor main body 1a Tip opening part 2 Sleeve 3 Expansion forced part 4a Screw part 7 Slit

Claims (1)

Threaded portion for attaching the separator other equipment to a cylindrical anchor body which is provided to the rear end, and gradually enlarged toward the tip side from the middle portion of the anchor body, the hollow widening force portion for expanding the sleeve provided Rutotomoni, the tip of the anchor body, was continuously hollow expanding force unit by drawing, the distal end opening portion consisting of the inner flange-like tip piece is provided, the tip piece of the tip opening A taper shape is formed so as to gradually protrude forward from the base portion to the front end portion on the inner peripheral edge side , and a plurality of slits along the axis line are provided at the distal end of the sleeve that is externally fitted to the anchor body from the rear end side. Sleeve installation type post-installed anchors arranged side by side.

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