JP5186681B2 - Concrete block lifting anchor - Google Patents

Description

  The present invention relates to a concrete block lifting anchor, and more particularly, to a concrete block lifting anchor having a high anchor adhesion even when embedded in a thin concrete block.

  In order to easily lift the concrete block, an anchor is embedded in the concrete block, the anchor is locked with a lifting bracket such as a coupler, a hook, or a sling, and the lifting bracket is lifted with a wire rope. Moving, rolling, and installing are performed. (See Patent Document 1, Patent Document 2, and Patent Document 3)

  In recent years, concrete blocks having a small thickness are increasing for the purpose of reducing the weight of the concrete blocks. For this reason, when embedding a hanging anchor, there is a problem that the embedding portion cannot be set deep, and the adhesion force of the anchor is insufficient. In order to solve this problem, there is known an anchor in which a plate is provided at an end portion of the anchor embedded portion to increase the adhesion (see Patent Document 4 and the like). The conventional anchor described in FIGS. 8 and 9 of Patent Document 4 is attached by welding a plate portion to a substantially columnar body portion.

  In the case where the plate part is welded and fixed to the body part, welding must be performed securely in order to obtain a sufficient joining force between the weld metal and the base material, and it is difficult to obtain stable quality and the yield is poor. is there. In order to solve this problem, the anchor according to the claim of Patent Document 4 has a larger diameter than the insertion hole by passing a part of the columnar body part through the insertion hole of the plate part and then crushing the end part of the body part. The plate portion is sandwiched and fixed to the body portion. For this reason, there is a problem that it takes time to manufacture.

Further, the anchor bolts shown in Patent Document 1 and Patent Document 2 are formed such that the bolt base portion is larger in diameter than the shaft portion, but a specific forming method is not shown. If this base is formed by press molding like the anchor of Patent Document 4, there is a similar problem.
Japanese Patent Laid-Open No. 10-36064 JP 11-49476 A Japanese Patent Publication No.49-44151 Japanese Patent Laid-Open No. 2000-233887

The present invention solves the above-mentioned problems in conventional concrete block lifting anchors, and provides a concrete block lifting anchor that provides sufficient adhesion even when embedded in a thin concrete block. For the purpose.

The present invention is a concrete block lifting anchor having the following configuration.
(1) A plate portion having an insertion hole and a substantially columnar body portion, and the body portion includes a shaft portion, an engagement portion at the distal end of the shaft portion, and a pedestal at the proximal end of the shaft portion. The outer diameter is smaller than the hole diameter of the insertion hole of the plate part, and the outer diameter of the pedestal is formed larger than the hole diameter of the insertion hole of the plate part, and the shaft part of the body part is inserted into the insertion hole of the plate part and A concrete block lifting anchor characterized in that the engaging portion protrudes from the insertion hole of the plate portion and the pedestal is embedded in the concrete block in a state of being engaged with the insertion hole of the plate portion .
(2) The plate portion and the body portion are formed separately, and when used, the shaft portion of the body portion is inserted into the insertion hole of the plate portion, and the engagement portion protrudes from the insertion hole of the plate portion and The concrete block lifting anchor described in (1) above, wherein the pedestal is assembled in a state of being engaged with the insertion hole of the plate portion and embedded in the concrete block.
(3) The shaft portion of the body portion is inserted into the insertion hole of the plate portion, the engaging portion protrudes from the insertion hole of the plate portion, and the pedestal is integrally formed with the insertion hole of the plate portion. The concrete block lifting anchor described in (1) above.
(4) The outer diameter Lk of the locking portion is larger than the outer diameter Lj of the shaft portion and is equal to or smaller than the hole diameter W of the insertion hole, and the outer diameter Ld of the pedestal is the outer diameter Lk of the locking portion. The concrete block lifting anchor according to any one of [1] to [3] above, wherein the anchor is formed to be larger than the hole diameter W of the insertion hole and Lj <Lk ≦ W <Ld .

  The anchor of the present invention is thin because the plate portion spreading laterally of the body portion is embedded in the concrete block with the base end portion of the body portion engaged and fixed, and the plate portion projects sideways. Adhesive strength can be obtained even when buried in concrete blocks. Therefore, when the concrete block is lifted, the anchor is not pulled out, and the concrete near the anchor is not damaged by the lifting, so that the concrete block can be lifted safely.

  In the anchor of the present invention, the body part and the plate part can be easily joined and fixed. Therefore, the plate part and the body part are formed separately, and the body part is engaged and fixed to the plate part during use to form a concrete block. It is only necessary to bury it, and the anchor is not bulky during storage and transportation, and it is easy to handle. In addition, the plate portion may be fixed to the body portion in advance, and the plate portion may be formed integrally, and the body portion and the plate portion are easily joined and fixed, so that the manufacturing efficiency is good.

  In addition, the anchor of the present invention is provided with a communication hole together with an insertion hole in the plate portion, so that air in the concrete escapes through the communication hole when embedded in a concrete block, so that it is difficult for air to accumulate below the plate portion. In addition, since the concrete flows through the communication hole, the concrete is reliably filled around the plate portion, and the strength of the concrete block near the anchor does not decrease.

Hereinafter, the present invention will be specifically described based on embodiments.
An anchor according to the present invention includes a plate portion having an insertion hole and a substantially columnar body portion, and the body portion includes a shaft portion, an engagement portion at the tip of the shaft portion, and a pedestal at the base end of the shaft portion. The outer diameter of the joint part is smaller than the hole diameter of the insertion hole of the plate part, and the outer diameter of the base is larger than the hole diameter of the insertion hole of the plate part, and the shaft part of the body part is inserted into the insertion hole of the plate part. The concrete block lifting anchor is characterized in that the engaging portion protrudes from the insertion hole of the plate portion and the pedestal is embedded in the concrete block in a state of being engaged with the insertion hole of the plate portion .

  The plate portion may have any shape and size as long as it extends to the side of the body portion and is provided with an insertion hole. Any of a circular plate, a triangular plate, and a polygonal plate may be used. Further, the insertion hole of the plate portion may have any shape and size as long as the locking portion of the body portion can be inserted and the pedestal of the body portion engages. In addition, since it is easy to mold, the planar shape of the insertion hole is suitably a circle, an ellipse, or a substantially polygon such as a substantially triangle or a hexagon. Further, it is preferable to provide ribs in the plate portion because the strength of the plate portion is improved and the adhesion of the anchor is improved.

  The plate portion may be provided with a communication hole as well as an insertion hole. When the anchor is embedded in the concrete block, if a communicating hole is provided in the plate part, air in the concrete escapes through this communicating hole, so that it is difficult for the air to collect on the lower side of the plate, and the concrete is communicated with the communicating hole. Therefore, the concrete is sufficiently filled around the pedestal and the plate portion of the body portion and can be firmly embedded. Moreover, since the weight of an anchor becomes light by providing a communicating hole in a plate part, conveyance and installation of an anchor become easy. The size, shape, number, etc. of the communication holes can be arbitrarily determined within a range that does not cause a decrease in strength of the plate portion and a range that does not impair the effects of the present invention. For example, a plurality of communication holes may be provided around the insertion hole.

  As long as the material of a plate part does not impair the effect of this invention, what kind of thing may be sufficient as it. For example, metals such as stainless steel and carbon steel, ceramics, mortar, stone, resin, glass, carbon and the like can be used, and one or more of these can be used. In addition, metals such as stainless steel and carbon steel are preferable because they have good formability, high strength, and are easily fixed to the body portion.

  The body portion is substantially columnar, and the shape and size thereof are not limited as long as a locking portion is formed at the distal end portion and a pedestal is formed at the proximal end portion. For example, the body portion has a substantially columnar shape, a substantially prismatic shape, etc., and the locking portion has a shape and size that can be locked to the lifting bracket, and the length at which the base end side portion including the pedestal is embedded in concrete. As long as it has. Further, the shape and size of the pedestal of the body portion are not limited as long as the pedestal of the body portion engages with the insertion hole of the plate portion.

  In addition, for example, a plate whose cross section (cross section crossing the axial direction of the body portion) of the locking portion is similar to the opening shape of the insertion hole of the plate portion and has the same size as the insertion hole is a plate. When the locking portion of the body portion is inserted into the insertion hole of the portion, it is preferable that the locking portion is not easily removed from the insertion hole when the anchor is transported and installed. A commercially available concrete block lifting anchor can be used as long as the trunk portion satisfies the above conditions.

  As long as the material of a trunk | drum does not impair the effect of this invention, what kind of thing may be sufficient as it. For example, metals such as stainless steel and carbon steel, ceramics, mortar, stone, resin, glass, carbon, and the like can be used, and one or more of these can be used. In addition, metals such as stainless steel and carbon steel are preferable because of good moldability, high strength, and easy fixation to the plate portion.

  The anchor of the present invention is formed by separately forming the body part and the plate part, and immediately before embedding in the concrete block, the anchor part of the body part is inserted into the insertion hole of the plate part and assembled. It can be used by being embedded in a concrete block while being engaged with the insertion hole of the portion. It is preferable to form the body portion and the plate portion separately because they are not bulky during storage and transportation.

  In addition, the anchor of the present invention inserts the locking part of the body part into the insertion hole of the plate part at the time of manufacture, and fixes the body part and the plate part with the base of the body part engaged with the insertion hole. And may be formed integrally. If the body part and the plate part are integrally formed in advance, the labor efficiency of the body part can be increased because it is not necessary to insert the locking part of the body part into the insertion hole of the plate part during use.

  In the anchor of the present invention, the method for fixing the pedestal and the plate portion of the body portion is not limited, and a method using an adhesive, a method using welding, screwing, screwing, or the like can be used as appropriate. Note that it is preferable to use welding, particularly welding by pressure welding such as spot welding, because the fixing is reliable and the fixing can be performed in a short time. In the case of fixing by welding, it is not necessary to weld the entire contact portion between the pedestal of the body portion and the plate portion, and it is sufficient to mark one to several places.

  In the anchor of the present invention, the locking part of the body part is inserted into the insertion hole of the plate part, and the lower part of the body part including the engagement part is made of concrete in a state where the base of the body part is engaged with the insertion hole. It is buried in the block and installed so that the locking part protrudes outside the concrete.

  When the anchor of the present invention is installed, it is not affected by the orientation of the concrete block manufacturing form, the reinforcing bars embedded in the concrete block, or the like, and it is easy to install the trunk portion in the predetermined direction and position.

  The anchor of the present invention can be used in the same manner as a commercially available concrete block lifting anchor, particularly a commercially available concrete block lifting anchor having a plate portion.

  An example of the anchor according to the present invention is shown in FIGS. 1 to 6 (both are schematic views). 1 is a perspective view of the anchor of the present invention, FIG. 2 is a plan view of the anchor, FIG. 3 is a plan view of the plate portion, FIG. 4 is a sectional view of the anchor, and FIG. 5 is another embodiment of the anchor according to the present invention. FIG. 6 is a cross-sectional view of the anchor shown in FIG. 5.

  The illustrated anchor has a plate portion 10 and a body portion 20. The plate portion 10 has a disk shape with a raised central portion, and an insertion hole 11 is provided in the central portion, and a plurality of communication holes 12 are provided so as to surround the insertion hole 11. Further, the plate portion 10 has an outer edge portion bent to form a rib. As described above, the shape of the plate portion 10 is not limited to a circle, and the shape of the insertion hole 11 is not limited to a circle.

  The body portion 20 has a substantially columnar shape, and a locking portion 21 is formed at the distal end portion thereof, and a pedestal 22 is formed at the proximal end portion. The outer diameter Lk of the locking portion 21 is larger than the outer diameter Lj of the shaft portion 23 so that a lifting bracket or the like engages, but the insertion hole 11 of the plate portion 10 passes through the insertion hole 11. It is formed to be equal to or smaller than the hole diameter W. On the other hand, the outer diameter Ld of the pedestal 22 is larger than the outer diameter Lk of the locking part 21 and is larger than the hole diameter W of the insertion hole 11 so as to engage with the insertion hole 11 of the plate part 10 (Lj <Lk). ≦ W <Ld, see FIG. In addition, although the trunk | drum 20 shown in figure is a column shape, as stated previously, the trunk | drum 20 is not restricted to a cylinder.

  As shown in FIG. 1, the body portion 20 and the plate portion 10 are engaged in a state where the locking portion 21 of the body portion 20 is inserted into the insertion hole 11 of the plate portion 10 and the base 22 is engaged with the insertion hole 11. It is buried in concrete so that the stop 21 protrudes. The body portion 20 and the plate 10 may be integrally formed at the time of manufacture or may be assembled at the time of use. Further, when welding is performed as means for fixing the body portion 20 and the plate portion 10, it is not necessary to weld all around the insertion hole 11, and several spot weldings 13 may be performed as shown in FIG. 2. .

  The anchor shown in FIG. 5 is another embodiment according to the present invention, the communication hole 12 is not provided in the plate portion 10, and the rest has the same configuration as the anchor shown in FIG. Further, the plate portion 10 has an outer edge portion bent to form a rib. Further, as shown in FIG. 6, the base 22 of the body portion 20 may be formed separately from the shaft portion 23, fitted into the proximal end portion of the shaft portion 23, and fixed by screwing or the like. The anchor of the present invention also includes the embodiment shown in FIGS.

  In the illustrated anchor of the present invention, the plate portion 10 is engaged with the pedestal 22 of the body portion 20 and the plate portion 10 projects to the side of the body portion 20, so that it is attached to the concrete when embedded in concrete. Attaching force is large and can be firmly fixed. Further, by providing the communication hole 12 in the plate part 10, air under the plate part escapes to the outside through the communication hole 12 when buried in concrete, so that air accumulation can be prevented and the weight can be reduced. it can. Furthermore, since the body part 20 and the plate part 10 may be integrally formed at the time of manufacture and may be engaged immediately before embedding, it is easy to handle.

The perspective view of the anchor of this invention Plan view of the anchor shown in FIG. Plan view of the plate portion shown in FIG. 2A-A sectional view of the anchor shown in FIG. The perspective view which shows the other Example of the anchor which concerns on this invention Sectional view of the anchor shown in FIG.

Explanation of symbols

10-plate part, 11-insertion hole, 12-communication hole, 13-spot welding, 20-body part, 21-locking part, 22-pedestal, 23-shaft part, Lk-locking part outer diameter, Lj- Shaft outer diameter, Ld—pedestal outer diameter, W—hole diameter of insertion hole.

Claims (4)

A plate portion having an insertion hole and a substantially columnar body portion, and the body portion includes a shaft portion, an engagement portion at the distal end of the shaft portion, and a pedestal at the shaft portion base end, and the outer diameter of the engagement portion is The hole diameter of the plate portion is smaller than the hole diameter of the insertion hole, and the outer diameter of the pedestal is larger than the hole diameter of the insertion hole of the plate portion, and the shaft portion of the body portion is inserted into the insertion hole of the plate portion and the engaging portion A concrete block lifting anchor characterized in that the anchor protrudes from the insertion hole of the plate portion and is embedded in the concrete block in a state where the pedestal is engaged with the insertion hole of the plate portion . The plate part and the body part are formed separately, and when used, the shaft part of the body part is inserted into the insertion hole of the plate part, and the engaging part protrudes from the insertion hole of the plate part, and the pedestal is the plate The concrete block lifting anchor according to claim 1, wherein the anchor is assembled in a state engaged with the insertion hole of the portion and embedded in the concrete block. The shaft portion of the body portion is inserted into the insertion hole of the plate portion, the engaging portion protrudes from the insertion hole of the plate portion, and the pedestal is integrally formed in a state of being engaged with the insertion hole of the plate portion. A concrete block lifting anchor described in 1. The outer diameter Lk of the locking part is larger than the outer diameter Lj of the shaft part and is equal to or smaller than the hole diameter W of the insertion hole, and the outer diameter Ld of the pedestal is larger than the outer diameter Lk of the locking part, The concrete block lifting anchor according to any one of claims 1 to 3, wherein the anchor is formed to be larger than a hole diameter W of the insertion hole and Lj <Lk≤W <Ld .

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