JP4795865B2 - Concrete block suspension - Google Patents

Description

  The present invention relates to a concrete block hoisting device installed in a harbor, coast, river, etc., in particular, for a concrete block whose trunk is inclined when placed on a horizontal surface. Further, the present invention relates to a concrete block lifting tool that can be easily and safely lifted.

  As shown in FIG. 7, as a wave-dissipating root hardening block installed at a harbor, a coast, etc., a leg portion (vertical leg portion 83) extending in the vertical direction at both ends of the central body portion 82, and extending in the horizontal direction. Concrete blocks 81 each having existing leg portions (horizontal leg portions 84) (leg portions extending in a direction orthogonal to the axis of the central trunk portion 82 are provided at both ends of the trunk portion 82, respectively. Is held in a horizontal state and one leg (vertical leg 83) is held in a vertical state, the other leg (horizontal leg 84) is in a horizontal state. Conventional concrete blocks 81) are known.

  This type of concrete block 81 is often manufactured in a state where the body portion 82 is horizontal (a state where the leg portion 83 on one side is vertical and the leg portion 84 on the other side is horizontal). More specifically, the part of the mold is formed horizontally, the part forming the body part 82 is horizontal, the part forming the leg part 83 on one side is vertical, and the part forming the leg part 84 on the other side is horizontal. In such a state, it is manufactured by assembling reinforcing bars in the formwork and placing concrete.

  As shown in FIG. 7, the demolding is performed on the inverted U-shaped suspension bars 85, 85 protruding upward from the top end surface 83 a of the vertical leg 83 and the top end surface 84 a of the horizontal leg 84. Hang the wires 86 and 86 with adjusted height and balance with the balance rod 87 (steel) and lift it with a crane (balance suspension), or omit the balance rod 87 and hang it on the suspension bars 85 and 85 It is lifted only by the bifurcated wires 86 and 86 (direct suspension). According to these methods, the concrete block 81 can be lifted while the body portion 82 is in a horizontal state, so that the mold can be easily removed.

  Incidentally, the concrete block 81 shown in FIG. 7 includes a huge block having a weight of 40 to 80 t. Such a large block is lifted as shown in FIG. 7 and transferred to a horizontal yard as shown in FIG. When trying to (temporary placement), there is a risk that an excessive load is applied to the hanging bar 85, the hanging bar 85 is deformed, and in the worst case, it is broken.

  Further, as shown in FIG. 7, when a shackle or hook at the tip of the wire 86 is hung on the suspension bar 85 of the concrete block 81, it is not safe because it involves a work at a high place. Furthermore, due to the deformation of the suspension bar, the concrete (the top end surfaces 83a and 84a) near the base end portion of the suspension bar 85 may be crushed or cracked.

  The present invention has been made to solve such a conventional technique, and is configured to be able to be lifted by sandwiching the body portion of the block, and even a concrete block in which no suspension bars are arranged. An object of the present invention is to provide a concrete block lifting tool that can be easily and safely lifted without damaging the block.

  A concrete block lifting tool according to the present invention includes a sandwiching portion that sandwiches a part of the block, a roller, a guide portion that supports alignment with the block, and a posture for switching the sandwiching portion and the guide portion. It is characterized by having a posture switching mechanism.

In this lifting tool, the posture switching mechanism is inserted through a support plate, a swing arm supported so as to be rotatable with respect to the support plate, and a through-hole formed in the swing arm. It is composed of a wire cable, and from the state of the basic posture in which the clamping part is vertical, the swing arm is rotated and the position is changed, so that one side of the lifting tool is pulled upward by the tension of the wire cable. It is preferable to be configured to have an inclined posture. Further, the swing arm is configured to rotate to an over center position exceeding 180 °, and is configured so that the rotation is restricted at that position, and the pushing rod has a tip portion extending in the protruding direction of the support plate. When the crane is rolled up and lifted with the swing arm rotated against the urging force of the pushing rod, the swing arm is pulled upward by the tension of the wire cable. When the wire cable is slackened and the wire cable is slackened, the swing arm is preferably pushed back by the pushing rod to assume the basic posture.

  Since the present invention is configured so that it can be lifted so as to sandwich a part of the block (for example, the trunk), even if it is a concrete block in which no hoisting bars or the like are disposed, Moreover, it can be safely lifted without damaging the concrete block.

  Moreover, since the lifting tool of this invention has a guide part (a front guide part and / or a back guide part), the mounting operation | work to a block can be performed smoothly and an appropriate position (block Center position, center of gravity position, etc.). Furthermore, the position shift of the lifting tool after mounting can be prevented.

  In addition, since the posture switching mechanism is provided, the lifting tool can be mounted smoothly and accurately not only when the clamping target portion of the block is in a horizontal state but also in an inclined state. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view of a concrete block lifting tool 1 according to the present invention. In this figure, 2 is a wire rope, 3 is a front guide part, 4 is a clamping part, and 5 is a rear guide part. As shown in the figure, the front guide portion 3 and the rear guide portion 5 are connected and fixed to the sandwiching portion 4 located between them via joint members 6 and 7 having a rectangular cross section.

  The dimensions and weights of the front guide portion 3, the rear guide portion 5, and the joint members 6 and 7 are adjusted so that the weight distribution before and after the pinching portion 4 is the center. And the wire rope 2 is latched by the clamping part 4, and when the wire rope 2 is lifted with a crane, as shown in FIG. The whole can be lifted with the same posture (basic posture).

  FIG. 2 is a cross-sectional view of the lifting tool 1 along the line XX shown in FIG. As shown in the figure, the clamping part 4 is composed of a base 8 and a pair of left and right clamp arms 9 (9a, 9b). The clamp arms 9a, 9b are fixed horizontally in the lower part of the base 8. It is attached to the base 8 via the two shafts 10 and 10, and is rotatable around the shafts 10 and 10.

  Shackles 11, 11 are attached to the shoulders of the clamp arms 9a, 9b, respectively, and the lower ends of the wire ropes 2, 2 are locked to these shackles 11, 11 as shown in the figure. Yes.

  The lower ends of the clamp arms 9a and 9b open outward when the shackles 11 and 11 are pulled inward or upward, and conversely close inward when the shackles 11 and 11 are pulled outward or downward. It is configured. Therefore, as shown in FIG. 2, when the upper ends of the wire ropes 2 and 2 are pulled upward together, the shackles 11 and 11 are pulled inward and upward, and the lower ends of the clamp arms 9a and 9b are opened. Acts on. When the wire ropes 2 and 2 are slackened, the clamp arms 9a and 9b are rotated in the closing direction by their own weight.

  The base 8 is provided with a lock mechanism (not shown) so that the rotation of the clamp arms 9a and 9b can be restricted and fixed. Therefore, when the lock mechanism is operated when the lower ends of the clamp arms 9a and 9b are in the most closed state, the lock mechanism is fixed in that state, and the wire ropes 2 and 2 and the shackle are locked unless the lock is released. Even if 11, 11 is pulled inward or upward, the clamp arms 9a, 9b are maintained in the state where the lower ends are closed most.

  FIG. 3 is a front view of the front guide portion 3 shown in FIG. As shown in the drawing, the front guide part 3 has both ends of the frame 12 lower than the center part, and four rollers 13 are arranged on the lower inclined surface. As shown in FIGS. 1 and 3, a rising stopper 14 is attached to the center of the upper portion of the front guide portion 3 so as to protrude forward.

  Note that the rear guide portion 5 (see FIGS. 1 and 2) also has both ends of the frame 16 lower than the central portion, like the front guide portion 3, and four rollers 17 are provided on the lower inclined surface. Has been placed. Further, lower stoppers 18 and 18 are attached to both outer side surfaces of the frame 16 so as to protrude downward (see FIGS. 1 and 2).

  As described above, when the lifting tool 1 according to the present invention is lifted by a crane or the like, as shown in FIG. 1, the lifting device 1 is normally in a “basic posture” state in which the clamping portion 4 is vertical. By operating the mechanism 15 (see FIGS. 1 and 3), it is possible to shift from the “basic posture” shown in FIG. 1 to the “tilt posture” shown in FIG.

  This point will be described in more detail. The posture switching mechanism 15 includes the base plate 19, the rib 20, the support plate 21, the swing arm 22, the pushing rod 23, the wire cable 24, and the locking portion 25 shown in FIG. 3. As shown in FIG. 1, the base plate 19 is erected upward from the upper surface of the joint member 6, and has a structure in which its rigidity is reinforced by ribs 20 (see FIG. 3).

  The support plate 21 is fixed in a state of protruding from the side surface of the base plate 19 to the side and in a state of being inclined counterclockwise with respect to the horizontal plane as shown in FIG. The swing arm 22 is supported by a support plate 21 and is configured to be rotatable around a shaft 21 a fixed to the support plate 21 (on an inclined plane parallel to the support plate 21).

  The swing range of the swing arm 22 is rotated 190 ° clockwise from the position indicated by the solid line in FIG. 3 (the position where the center of the through hole 22a formed near the outer end is the highest) (the highest position). The swing arm 22 'indicated by the broken line comes into contact with the side surface of the base plate 19 at that position, and further rotation is restricted. It has become.

  A wire cable 24 is inserted into the through hole 22 a of the swing arm 22. The lower end of the wire cable 24 is locked to a locking portion 25 erected upward from the upper surface of the joint member 7, and the upper end is hooked on the crane hook together with the upper end of the wire rope 2.

  The pushing rod 23 is held so that its axis is horizontal and is slidable in the horizontal direction within a predetermined range. Further, the pushing rod 23 has a tip portion 23a penetrating the base plate 19, and a tip portion 23a projects in the same direction as the projection direction of the support plate 21 (right side in FIG. 3) by a coil spring (not shown). Is being energized.

  The distal end portion 23a of the pushing rod 23 is located on an inclined plane on which the swing arm 22 rotates, and when the swing arm 22 is rotated 150 ° clockwise from the position shown by the solid line in FIG. The portion 23 a comes into contact with the side edge of the swing arm 22. As described above, the swing arm 22 has a structure that can be rotated to a position of 190 °. Therefore, if the swing arm 22 is rotated by applying a force that exceeds the urging force of the pushing rod 23, the tip of the pushing rod 23 can be rotated. 23a can be finally rotated to a position of 190 ° while pushing the base plate 19 toward the base plate 19, but when the applied force is loosened or released, the swing arm 22 is moved to 150 ° or less by the pushing rod 23. It will be pushed back to the position.

  In order to shift from the “basic posture” shown in FIG. 1 to the “inclined posture” shown in FIG. 4 by the posture switching mechanism 15, first, the lifting tool 1 is grounded on the ground or the like, and the wire rope 2 When the crane hook is further lowered, the lifting tool 1 tilts. Specifically, it tilts to the right in FIG. 1 and tilts until the lowering stopper 18 contacts the ground. By doing so, the wire cable 24 is further loosened than when the lifting tool 1 is grounded on the ground or the like.

  If the wire cable 24 is slackened, the swing arm 22 is rotated. By pulling an operation rope (not shown) wound around a pulley interlocking with the swing arm 22 diagonally downward. The swing arm 22 is rotated so that it remains at the position indicated by the broken line 22 'in FIG. 3 (the position rotated clockwise by 190 ° from the highest position) against the urging force of the pushing rod 23. Let it be maintained.

  In this state, when the crane is slowly wound up and the lifting tool 1 is lifted, the load of the portion below the shackle 11 acts and the wire rope 2 and the wire cable 24 are tensioned. The tension of the wire cable 24 causes the swing. The arm 22 to the base plate 19 are pulled relatively upward, and the portion below the shackle 11 is in an inclined posture with the front side (left side in FIG. 4) raised as shown in FIG.

  At this time, the tension force of the wire cable 24 and the load below the shackle 11 act on the swing arm 22 in part, and the force to return to the highest position works. However, the swing arm 22 exceeds 180 ° from the highest position. Therefore, the force acts in such a direction as to push the swing arm 22 toward the base plate 19 side. Since this force is larger than the urging force of the pushing rod 23, the swing arm 22 is not pushed back to the region within 150 ° by the pushing rod 23 even if the turning operation by the operating rope is finished, and the base plate 19. It is fixed in a state where it is pressed against the side. This state (inclined posture) is maintained as long as the state in which the shackle 11 and below are suspended from the wire rope 2 continues.

  When returning from the inclined posture to the basic posture, the lifting tool 1 is grounded on the ground or the like, the wire rope 2 is slackened, and further the crane hook is lowered, the lifting tool 1 is tilted. Specifically, it tilts to the right in FIG. 1 and tilts until the lowering stopper 18 contacts the ground. By doing so, the wire cable 24 is loosened, and the force pressing the swing arm 22 toward the base plate 19 is reduced, and the swing arm 22 is pushed back to the region within 150 ° by the pushing rod 23. When it is lifted again in this state, a slight tension is generated in the wire cable 24, and the swing arm 22 returns to a position slightly lowered from the highest position, and assumes a basic posture as shown in FIG.

  Next, a method for lifting a concrete block as shown in FIG. 7 using the lifting tool 1 will be described. When lifting a concrete block whose body is horizontal, such as when removing a concrete block, first, the lifting tool 1 is set to a basic posture (a posture in which the sandwiching portion 4 is vertical), as shown in FIG. As shown in FIG. 5, the lifting tool 1 is hung from above the concrete block with the clamp arms 9 a and 9 b being most open, and the lifting tool 1 is placed on the trunk portion 32 of the concrete block 31 as shown in FIG. 5. Place.

  At this time, a total of four rollers 13 are disposed on the lower inclined surface of the front guide portion 3 on the left and right sides, and four rollers 17 are similarly disposed on the lower inclined surface of the rear guide portion 5. (See FIGS. 1 to 3), the center of the left and right of the lifting tool 1 is aligned with the center position on the trunk 32 only by performing simple guidance work without performing precise positioning. be able to. Further, since the front guide portion 3 is provided with a rising stopper 14 and the rear guide portion 5 is provided with lowering stoppers 18, 18, the front and rear centers of the lifting tool 1 are positioned at the center position on the trunk portion 32. Can be easily adjusted.

  As shown in FIG. 5, after placing the lifting tool 1 at an appropriate position on the body 32 of the concrete block 31, the crane hook is further lowered to loosen the wire ropes 2, 2. The clamp arms 9a and 9b of the section 4 are rotated by their own weight in the closing direction (to the positions indicated by broken lines 9a ′ and 9b ′ in FIG. 2), and the body 32 of the concrete block 31 is sandwiched. Next, a lock mechanism (not shown) is operated to restrict and fix the rotation of the clamp arms 9a and 9b. By raising the hook of the crane in this state, the concrete block 31 can be easily and safely lifted while being held by the lifting tool 1. Moreover, when suspended in a horizontal yard or the like, an excessive load is not generated on the concrete block 31, and problems such as damage can be suitably avoided.

  On the other hand, when lifting a concrete block whose trunk is inclined, first, the posture switching mechanism 15 is operated to set the lifting tool 1 to the inclined posture (see FIG. 4), as shown in FIG. The lifting tool 1 is suspended from above the concrete block with the clamp arms 9a and 9b being most open, and the lifting tool 1 is placed on the trunk 32 of the concrete block 31, as shown in FIG. .

  In the present embodiment, the swing arm 22 and the wire cable are set so that the inclination angle of the lifting tool 1 when set in the inclined posture matches the inclination angle of the trunk portion 32 in the concrete block 31 to be lifted. 24, the dimensions, the mounting angles, the arrangement configuration, etc. of each component of the posture switching mechanism 15 are set or adjusted, and the rollers 13, 17 of the front guide portion 3 and the rear guide portion 5, the rising stopper 14 and the lowering stoppers 18, 18, etc., so that the lifting tool 1 can be placed at an appropriate position on the trunk portion 32 of the concrete block 31 by performing simple guidance work without performing precise alignment. Can be placed.

  When the lifting tool 1 is placed on the concrete block 31, the clamp arms 9a and 9b of the holding part 4 are rotated in the closing direction, the body part 32 is sandwiched, and a lock mechanism (not shown) is operated to clamp The arms 9a and 9b are fixed. By lifting the crane hook in this state, the concrete block 31 is easily and safely held in the state of being held by the lifting tool 1 (even from the state where the trunk portion 32 is inclined) Can be lifted without causing a heavy burden). Therefore, problems such as damage can be suitably avoided.

The side view of the lifting tool 1 which concerns on the 1st Embodiment of this invention. Sectional drawing of the lifting tool 1 by the XX line shown in FIG. The front view of the front guide part 3 in the lifting tool 1 shown in FIG. The side view of the lifting tool 1 (inclination posture) shown in FIG. The figure which shows the state which mounted | wore the concrete block 31 with which the trunk | drum 32 was horizontal to the lifting tool 1 shown in FIG. The figure which shows the state which mounted | wore the concrete block 31 in the state in which the trunk | drum 32 inclined the lifting tool 1 shown in FIG. Explanatory drawing of the lifting method of the concrete block 81 in the past. Explanatory drawing of the lifting method of the concrete block 81 in the past.

Explanation of symbols

1: Lifting tool,
2: wire rope,
3: Front guide part,
4: Clamping part,
5: Rear guide part,
6, 7: Joint member,
8: Base,
9, 9a, 9a ′, 9b, 9b ′: clamp arm,
10: shaft,
11: Shackle,
12: Frame,
13: Laura,
14: Raise stopper,
15: Posture switching mechanism,
16: Frame,
17: Laura,
18: Lowering stopper,
19: Base plate,
20: Rib,
21: support plate,
21a: shaft,
22, 22 ': Swing arm,
22a: through hole,
23: Pushing rod,
23a: tip portion,
24: Wire cable,
25: Locking part,
31, 81: Concrete block,
32, 82: trunk,
83: vertical leg,
83a: top face,
84: Horizontal leg,
84a: top face,
85: Suspension,
86: Wire,
87: Balance rod

Claims (2)

Suspension for a concrete block having a sandwiching part that sandwiches a part of the block, a guide part that has a roller and supports alignment with the block, and a posture switching mechanism for switching the posture of the sandwiching part and the guide part Tools ,
The posture switching mechanism is configured by a support plate, a swing arm supported so as to be rotatable with respect to the support plate, and a wire cable inserted through a through hole formed in the swing arm,
By rotating the swing arm and changing the position from the basic posture state in which the clamping portion is vertical, one side of the lifting tool is pulled upward by the tension of the wire cable to be in an inclined posture. It is comprised as follows, The lifting tool for concrete blocks characterized by the above-mentioned. The posture switching mechanism has a pushing rod;
The swing arm is configured to rotate to an over-center position exceeding 180 °, and the rotation is restricted at that position.
The pushing rod is urged so that the tip protrudes in the same direction as the protruding direction of the support plate,
When the crane is wound up and lifted in a state where the swing arm is rotated against the urging force of the pushing rod, the swing arm is pulled upward by the tension of the wire cable, and becomes an inclined posture.
The lifting tool for a concrete block according to claim 1, wherein when the wire cable is loosened, the swing arm is pushed back by a pushing rod to assume a basic posture .

Images