JP2010173786A - Device and method for lifting four-leg block - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a four-leg block lifting device which is easily attachable to a four-leg block by one worker when the four-leg block is lifted and manufacturable at low cost. <P>SOLUTION: This four-leg block lifting device 6 lifts the four-leg block 1 comprising cylindrical erected legs 2 which project upward and are gradually reduced in diameter toward the front ends and cylindrical sloped legs 3 which project in the diagonal lower three directions from the erected legs 2 and are gradually reduced in diameter toward the front ends. The four-leg block lifting device includes a hooking device 7 comprising a bearing plate 9 attached to the forward end surface 5 of one of the sloped legs 3 and side plates 10 which are attached to both ends of the bearing plate 9 and mounted on the chamfered part 4 of the forward end surface 5 and a lifting cable 8 hooked in a U-turn shape to the hooking device 7. An auxiliary cable 28 stretched to the erected legs 2 is installed between the left and right-side cables of the lifting cable. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a lifting device and a lifting method for a quadruple block when demolding a concrete quadruped block (so-called tetra-shaped wave-dissipating block) used for revetment or river wave extinction.

  Japanese Unexamined Patent Application Publication No. 2004-307077 is known as a lifting jig for removing a conventional tetrapod block. As shown in FIG. 1, the outside of three obliquely downward projecting legs is surrounded by a frame-shaped main body, and is lifted by a hanging means such as a wire hooked on the frame-shaped main body.

JP 2004-307077 A

  However, the lifting jig for the four-leg block as described above is not only large and expensive, but also the frame-shaped main body that surrounds the outer sides of the three obliquely downward protruding legs. Since the installation is also performed by a plurality of workers, there is a problem that the process and the work cost are increased due to the complexity.

  The present invention has been made in view of these problems. An object of the present invention is to provide an inexpensive lifting device for a quadruple block that can be easily attached to a quadruple block by a single operator when the tetrapod block is lifted. It is to provide a method for lifting a leg block.

  A lifting device for a quadruped block for solving the above problems includes a column-shaped standing leg projecting upward and having a gradually decreasing diameter toward the tip, and a slanting lower side centered on the standing leg. A quadruple block that protrudes in three directions and is formed with a cylindrical inclined leg portion that gradually decreases in diameter toward the tip, and is installed on the front end face of one of the inclined leg portions. And a latching device comprising a side plate that is attached to both ends of the bearing plate and is installed at the chamfered portion of the front end surface, and a lifting device that is hooked on the latching device in a U-turn shape. An auxiliary wire is installed between the left and right wires of the lifting wire, and an auxiliary wire is installed between the standing legs. Moreover, the bearing plate includes being installed below the center of the front end face of the inclined leg portion. The side plate includes a protective plate installed on the outer peripheral surface of the inclined leg portion. The lifting wire is hooked to the wire fixture of the bearing plate in the latch, and the wire fixture is composed of an upper plate and a lower plate protruding with an appropriate gap, and is hooked to the gap. This includes that a stop plate that prevents the lifting wire from being detached is installed across the upper and lower plates.

  In addition, the lifting method of the four-leg block includes a supporting plate installed on the front end surface of one inclined leg portion of the inclined leg portion, and a chamfered portion on the front end surface attached to both end portions of the supporting plate. It is composed of a latching device comprising a side plate to be installed, and a lifting wire that is hooked on the latching device in a U-turn shape, and the auxiliary wire that is suspended between the right and left wires of the lifting wire. A lifting device for a quadruped block with wires installed is used, and an auxiliary wire is hooked on the outer periphery of the standing leg of the quadruped block, and supported by the front end face and the chamfered portion of one inclined leg. After the pressure plate and the side plate are installed, the lifting wire is lifted by a crane to lift the quadruple block. Moreover, the bearing plate includes being installed below the center of the front end face of the inclined leg portion. The side plate includes a protective plate installed on the outer peripheral surface of the inclined leg portion.

  A single operator can carry and handle the lifting device, so the auxiliary wire is hung on the outer peripheral surface of the standing leg of the quadruped block, and the support plate is attached to the front end face and the chamfered part of one inclined leg. The side plate can be easily installed. Then, when the lifting wire of the lifting device attached to the quadruple block is lifted by the crane, the support plate and the side plate are pressed against the front end face and the chamfered portion, and the quadruple block is lifted from the formwork. The above-mentioned support plate crosses the front end surface below the center of the front end surface inclined to the upper side (in the direction away from the inclined leg) (position eccentric from the center of the circle) and above the mold. Since most of the side plates (2/3 or more) are installed below the center of the front end face, the support plate and the side plate are moved forward when the quadruped block is lifted. Since it is pressed by the end face and the chamfered portion, it does not come off. On the other hand, since the auxiliary wire is hung on the outer peripheral surface of the standing leg part, the quadruple block is lifted with good balance without rotating by the force acting on one inclined leg part. Further, after the quadruple block is hung down at a predetermined location, when the lifting wire is lowered, the pressing force between the support plate and the side plate is released and the front end surface and the chamfered portion are removed. Then, when the auxiliary wire is removed from the standing leg, the lifting device can be easily removed from the tetrapod block.

It is a quadruple block, (1) is a plan view and (2) is a front view. It is the lifting device of 1st Embodiment, (1) is a front view, (2) is a side view. (1) is the front view which installed the latching tool in the front end surface of an inclination leg part, (2) is the same sectional drawing. It is the side view which installed the latching tool in the front end surface of an inclination leg part. It is the perspective view which installed the latching tool in the front end surface of an inclination leg part. It is the perspective view which installed the latching tool in the front end surface of an inclination leg part. It is the lifting device of 2nd Embodiment, (1) is a front view, (2) is a side view. It is the perspective view which lifted the tetrapod block with the lifting device.

  Embodiments of a lifting device for a quadruped block of the present invention (hereinafter referred to as a lifting device) will be described below with reference to the drawings. As shown in FIG. 1, the four-leg block 1 includes a column-like standing leg portion 2 that protrudes upward and has a progressively smaller diameter toward the tip, and a diagonally lower three-piece centered on the standing leg portion 2. The columnar inclined leg portions 3 projecting in the direction and gradually formed in a small diameter toward the tip, and the front end portions of the inclined leg portions 3 are chamfered portions 4 and the outer side (inclined leg portions). This is a so-called tetra-shaped wave-dissipating block formed with a circular front end face 5 inclined in a direction away from the front end face 5.

  FIG. 2 shows a lifting device 6 according to the first embodiment for lifting the tetrapod block 1 from a lower mold (not shown) on the lower side of the three inclined legs 3, and the lifting tool 7 and the lifting device 7. It consists of a wire 8.

  The latch 7 protrudes from the support plate 9, the side plates 10 formed on both sides of the support plate 9, the protection plate 12 formed on the side plate 10, and the front surface of the support plate 9. The wire fixture 13 is comprised.

  As shown in FIG. 3, the pressure bearing plate 9 is a flat plate having an appropriate width installed on the front end surface 5, and side plates 10 at both end portions are curved inward. Since the side plate 10 is installed in the chamfered portion 4, it is installed at the same angle as the inclination angle α of the chamfered portion. Further, the side plate 10 has a protective plate 12 for protecting the corner portion 14 between the chamfered portion 4 and the outer peripheral surface 11 of the inclined leg portion from the lifting wire 8, and the inclination angle θ between the chamfered portion 4 and the outer peripheral surface 11 of the inclined leg portion. It is installed with the same angle.

  Therefore, when the bearing plate 9 is installed horizontally below the center 15 of the front end surface and across the front end surface, the side plate 10 is installed on the chamfered portion 4 and the protective plate 12 is installed on the outer peripheral surface 11 of the inclined leg portion. However, the side plate 10 is also installed below the center 15 of the front end face. This is because the support plate 9 is installed on the upper side of the side plate 10, and most of the lower side plate (length of about 2/3 or more) extends downward from the support plate 9.

  Further, as shown in FIG. 4, the wire fixture 13 is formed by an upper plate 17 and a lower plate 18 projecting with an appropriate gap 16 from the front surface of the bearing plate to the front surface of the side plate. 18, a flat plate-like stop plate 19 for preventing the lifting wire 8 inserted into the gap portion 16 from coming out is fixed by a bolt 20. The upper plate 17 has a T-shaped cross section composed of a horizontal member 21 and a vertical member 22, and bent portions 23 that are inclined at the same inclination angle as the side plate 10 are formed on both sides. It is inclined upward.

  On the other hand, the lower plate 18 also has an L-shaped cross section composed of a horizontal member 21 and a vertical member 22 in the same manner as described above. It protrudes from the side plate 10. An annular handle 25 for carrying the stopper 7 is installed on the support plate 9 above the stop plate.

  Further, a U-turn portion 26 of a lifting wire bent in a U-turn shape is inserted into the gap portion 16 between the upper plate 17 and the lower plate 18 of the wire fixture 13 and latched, so that the left and right wires 8a, 8b. A ring 27 for hooking a hook of a crane is formed at the upper end portion of the shaft. An auxiliary wire 28 is installed between the left and right wires 8a and 8b.

  FIG. 7 shows a lifting device 29 according to the second embodiment. This lifting device 29 is the same as the lifting device 6 of the first embodiment except that a protective plate is not installed on the side plate 10 of the hook 7.

  Note that the wire fixture 13 is not limited to those of the first and second embodiments described above, but a hook installed on the support plate 9 or a wire insertion hole provided on the support plate 9. It may be a flat plate provided with.

  Next, a method for lifting the quadruple block using the lifting device 6 according to the first embodiment will be described. Since this lifting device 6 can be carried by one worker, the auxiliary wire 28 is hooked on the outer periphery of the standing leg 2 in the quadruped block 1, and the front end face 5 and the chamfered part 4 in one inclined leg 3 The support plate 9 and the side plate 10 are installed. The bearing plate 9 is located on the lower side (center deviated from the center of the circle) of the front end surface 15 inclined outward (in the direction away from the inclined legs) toward the upper side and on the upper side of the mold. The side plate 10 is also installed below the center 15 of the front end face.

  Next, when the lifting wire 8 is lifted by a crane, as shown in FIG. 8, the bearing plate 9 and the side plate 10 are pressed against the front end face 5 and the chamfered portion 4, and the bearing plate 9 is centered 15 on the front end face. Since it is installed on the lower side and on the upper side of the formwork, and the side plate 10 is also installed on the lower side of the center 15 of the front end surface, the latch 7 is prevented from being detached from the front end surface 5 and the chamfered portion 4. Yes. Further, since the auxiliary wire 28 is hung on the outer periphery of the standing leg 2, the quadruple block 1 is prevented from rotating by the force acting on the single inclined leg 3 and is lifted with good balance.

  Next, when the quadruple block 1 is suspended at a predetermined position and then the lifting wire 8 is lowered, the pressing force acting on the support plate 9 and the side plate 10 is eliminated, so that the latch 7 is moved to the front end surface. 5 and the chamfer 4. And if the auxiliary | assistant wire 28 is removed from the standing leg part 2, the lifting apparatus 6 can be easily removed from the tetrapod block 1. FIG.

  Note that the method of lifting the quadruped block using the lifting device 29 of the second embodiment is the same method as described above.

DESCRIPTION OF SYMBOLS 1 Four leg block 2 Standing leg part 3 Inclined leg part 4 Chamfering part 5 Front end surface 6, 29 Lifting device 7 Latching device 8 Lifting wire 8a, 8b Left and right earer 9 Supporting plate 10 Side plate 11 Outer peripheral surface 12 Protection plate 13 Wire Mounting tool 14 Corner 15 Center of front end face 16 Gap 17 Upper plate 18 Lower plate 19 Stop plate 20 Bolt 21 Horizontal member 22 Vertical member 23 Bent part 24 Guide plate 25 Handle 26 U-turn part 27 Ring 28 Auxiliary wire

Claims (7)

  A columnar standing leg projecting upward and gradually decreasing in diameter toward the tip, and a columnar shape projecting in three directions obliquely downward from the standing leg and having a gradually decreasing diameter toward the tip A quadruple block composed of a plurality of inclined leg portions is suspended, and a supporting plate installed on a front end surface of one inclined leg portion of the inclined leg portions, and attached to both end portions of the supporting plate. And a lifting wire that is hooked on the hook in a U-turn shape, and is raised between the left and right wires of the lifting wire. A lifting device for a quadruped block, characterized in that an auxiliary wire is installed over the standing leg.   The lifting device for a quadruped block according to claim 1, wherein the support plate is installed below the center of the front end face of the inclined leg portion.   The lifting device for a quadruped block according to claim 1 or 2, wherein a protective plate installed on the peripheral surface of the inclined leg portion is installed on the side plate.   The lifting wire is hooked to the wire fixture of the support plate in the hook, and the wire fixture is composed of an upper plate and a lower plate protruding with an appropriate gap portion, and is hooked to the gap portion. The lifting device for a quadruped block according to any one of claims 1 to 3, wherein a stop plate for preventing the lifting wire from coming off is installed between the upper and lower plates.   The lifting device for a quadruped block according to claim 1 is used, and an auxiliary wire is hooked on the outer periphery of the standing leg in the quadruped block, and at the front end surface and the chamfered portion in one inclined leg. A method for lifting a quadruple block, characterized in that after the support plate and the side plate are installed, the lifting wire is lifted by a crane to lift the quadruple block.   6. The lifting method for a quadruped block according to claim 5, wherein the support plate is installed below the center of the front end face of the inclined leg portion.   The lifting method for a quadruped block according to claim 5 or 6, wherein a protective plate installed on the outer peripheral surface of the inclined leg portion is installed on the side plate.

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