JP2011178528A - Crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crane which is movable and installable easily and can efficiently perform a lifting operation. <P>SOLUTION: This crane includes a mast 3 which is vertically installed on a base 2 and extensible, a beam 5 which extends horizontally, which comprises an intermediate beam (intermediate member) 5b held on the upper part of the mast 3, a front end beam (first end member) 5a connected to one end of the intermediate beam 5b, and a rear end beam (second end member) 5c connected to the other end of the intermediate beam 5b, a lifting part 8 which is movably held by the front end beam 5a and lifts a beam form (object to be lifted) 52, an electric winch 6 installed to the rear end beam 5c, and a wire rope 7 which is wound and unwound by the electric winch 6 and vertically moves the lifting part. The front end beam 5a and the rear end beam 5c are vertically rotatable about the connection parts thereof with the intermediate beam 5b. The wire rope 7 extends from the electric winch 6, and the front end thereof is fixed to the front end beam 5a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a crane for lifting materials and the like in construction work.

Conventionally, in small and medium-sized construction sites such as RC construction, large cranes are not installed permanently, but rough cranes are installed as necessary. For this reason, conventional methods are mainly used in formwork work centered on manual work without using a crane.
In order to save labor and improve the yield of formwork, it is conceivable to form the groundwork of the formwork and increase the outer panel, so a simple crane that can lift the assembled formwork and the large panel of the outer wall has been developed. Yes.

A simple crane used for conventional formwork is, for example, a floor crane arranged on a work floor, and a hook block is provided at the tip of a jib held on a mast so as to be able to turn in a horizontal direction. The hook block is connected to a wire rope that is wound and fed by a hoist such as an electric winch, and can be moved in the vertical direction by winding and feeding the wire rope.
In the formwork using such a simple crane, the simple crane is moved along with the progress of the work.

  In addition, a material transport vehicle (crane) described in Patent Document 1 includes a traveling carriage that runs on a track, a guide rail that is installed on a deck of the traveling carriage and extends in a direction intersecting the track, and a guide rail. A slide block movable along the crane block, a crane support (mast) held rotatably on the slide support in the horizontal direction, and a crane arm held horizontally on the top of the crane support and extended horizontally And a suspended portion (hook) that is movable in the horizontal direction along the crane arm. When the material transporting vehicle is moved, the crane arm is moved in the horizontal direction so that the vehicle can travel within a limit width.

Japanese Patent No. 2624623

  However, the conventional simple crane is a single unit and has a large shape, and its own weight is, for example, 800 kg. Therefore, there is a problem that the relocation work becomes large and requires labor and time. In particular, when a jib or crane arm or the like is projecting in the horizontal direction, the relocation work is difficult.

In addition, in the conventional crane used in the conventional formwork described above, there is no problem in lifting large panels on the outer wall from the bottom up, but the pillars already installed after lifting the beam formwork etc. The operation of positioning between the molds could not be easily performed because the jib does not have an up-and-down function and the degree of freedom of movement of the hook is small. Even if the jib has an up-and-down function, the height of the beam form that is lifted will change due to the jib up-and-down, so the height of the hook block must be adjusted along with the up-and-down of the jib. It was inefficient.
Moreover, since the material conveyance vehicle described in patent document 1 is a structure in which a crane arm is settled in the limit width | variety which a vehicle can drive | work, the length of a crane arm will be limited and can perform a lifting work. The range will also be limited.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a crane that can be easily moved and installed and can efficiently perform a lifting operation.

  In order to achieve the above object, a crane according to the present invention includes a mast that is erected on a base and that can extend and contract in an axial direction, and an intermediate member that extends in a horizontal direction and is positioned in the middle of the extending direction. A first end member is connected to one end of the intermediate member in the extending direction, and is held at the upper portion so as to be pivotable in the horizontal direction, and a second end is connected to the other end of the intermediate member in the extending direction. A beam to which an end member is connected, a suspension portion that is held by the first end member so as to be movable along the extending direction of the beam, and lifts an object to be lifted; and provided to the second end member. An electric winch, and a wire rope that is wound and fed around the electric winch to move the suspended portion in the vertical direction, and the first end member and the second end member are connected to the intermediate member. Can be rotated in the vertical direction around the Yaropu is characterized in that the distal end portion extending from said electric winch is fixed to the first end member.

In the present invention, the first end member and the second end member are composed of an intermediate member, a first end member, and a second end member in which the mast can be expanded and contracted and the beam is connected in the extending direction. Can rotate in the vertical direction around the connecting part with the intermediate member, so that the mast is shortened when the lifting operation is not performed, and the first end member and the second end member are folded around the connecting part. Therefore, the crane can be made compact, and the crane can be easily moved and installed.
The wire rope extends from the electric winch provided on the second end member, and the tip end portion is fixed to the first end member, whereby the first end member and the second end member are connected to each other. The first end member and the second end member can be rotated by winding or feeding the wire rope with an electric winch.

Further, in the crane according to the present invention, the suspension part is a traveling member that travels along the first end member, and is provided below the traveling member and separated from the traveling member, and the lifting object The travel member and the hook member are both provided with a pulley, and the travel member and the pulley of the hook member are wound around the wire rope together.
In the present invention, the suspension portion includes a traveling member that travels along the first end member, and a hook member that is provided below the traveling member and is separated from the traveling member and on which the lifting object is hung. Both the member and the hook member have a pulley, and the traveling member and the hook member pulley are wound around the wire rope together so that the hook member moves horizontally along the first end together with the traveling member. When the electric winch unwinds the wire rope, it can move away from the traveling member, and when the electric winch winds up the wire rope, it can approach the traveling member and move upward.
And when the length of the wire rope is adjusted and the hook member is set to a predetermined height, and the traveling member is run in the horizontal direction with the length of the wire rope fixed, the hook is kept without changing the height. The member can be moved in the horizontal direction, which is convenient.

In the crane according to the present invention, a detachable counterweight is provided on the base, and the counterweight is provided on a wheel capable of traveling on an installation surface on which the base is installed, and on an upper portion of the wheel. And a mounting plate on which the weight main body is mounted, and a contact member that is installed on the mounting plate and protrudes downward and expands and contracts in the protruding direction. At least a part of the base is positioned so as to be separated from the mounting plate between the surface and the contact member, and the contact member extends downward to contact the base.
In the present invention, the load of the weight main body can be applied to the base via the contact member by the contact member contacting the base. Since the counterweight can be attached to and detached from the base by providing a wheel that can travel and a contact member that expands and contracts, the counterweight can be installed as necessary, and the weight can be reduced by separating the counterweight when moving. Since an object can be divided and moved, the moving work can be reduced.

  According to the present invention, since the crane can be easily moved and installed, the crane can be employed in many processes, so that construction can be performed efficiently.

(A) is a side view which shows an example of the crane by embodiment of this invention, (b) is a top view of (a). It is a figure which shows the crane which installed the spacer mast. FIG. 3 is an enlarged view of the beam of the crane shown in FIG. (A), (b) is a figure explaining the connection of an intermediate beam and a rear end beam. (A), (b) is a figure explaining a hanging part. It is a figure explaining the counterweight for bases. (A), (b) is a figure explaining the lifting process of a crane. It is a figure which shows the crane by which the mast was shortened. It is a figure which shows the crane by which the front end beam was folded. It is a figure which shows the crane by which the rear end beam was folded.

Hereinafter, the crane by embodiment of this invention is demonstrated based on FIG. 1 thru | or FIG.
As shown in FIGS. 1 (a) and 1 (b), the crane 1 according to the present embodiment is used for formwork construction at the construction site of an RC building, and lifts the assembled formwork. ing. In the present embodiment, the crane 1 is installed on a work floor 51 on the n-th floor of a building, and two column-shaped frames on which an n-th floor beam form (an object to be lifted) 52 has already been erected. The process of installing between 53 is demonstrated.

  The crane 1 includes a base 2 disposed on a work floor 51, a mast 3 standing from the base 2, a swiveling wheel 4 provided on the top of the mast 3, a beam 5 supported by the swirling wheel 4, An electric winch 6 provided on the beam 5, a wire rope 7 wound up and fed out of the electric winch 6, a suspension portion 8 that is attached to the beam 5 and lifts the beam form frame 52, and a base that is fixed to the base 2 Counter weight (counter weight) 9 (see FIG. 1B).

The base 2 includes a base body 11, casters 12 (see FIG. 1A) that can travel on the work floor 51, and outriggers 13.
The mast 3 is erected on the base body 11 with its axial direction as the vertical direction, and can be expanded and contracted in the vertical direction by driving a built-in hydraulic cylinder or the like, and its height can be adjusted. The height of the mast 3 is set in accordance with the floor height h of the building. When the floor height h is high and the height of the mast 3 is insufficient, as shown in FIG. A spacer mast 14 for adding height may be installed between the two.

  The swivel wheel 4 shown in FIGS. 1 and 3 can turn the beam 5 180 degrees in the horizontal direction as shown by an arrow B in FIG. 1B by driving a built-in motor or the like. In the present embodiment, the turning wheel 4 can turn the beam 5 180 degrees in the horizontal direction, but the turning of the beam 5 may be other than 180 degrees and may be structured to be rotatable in the horizontal direction.

The beam 5 is an I-shaped steel or the like that extends in the horizontal direction A during the lifting operation, and the front end beam (first end member) 5a, the intermediate beam (intermediate member) 5b, and the rear end beam (first end) in the extending direction. The second end member 5c is divided into three members. The front beam 5a, the intermediate beam 5b, and the rear beam 5c are connected in this order.
As shown in FIG. 3, the end of the front beam 5a on the side of the intermediate beam 5b, the end of the rear beam 5c on the side of the intermediate beam 5b, and both ends of the intermediate beam 5b are orthogonal to the extending direction of the beam 5. A plate member 21 such as a steel plate is provided. When the front beam 5a, the intermediate beam 5b, and the rear beam 5c are connected, adjacent plate members 21 are in surface contact.

  The two adjacent plate members 21 are formed with a notch 21a from the side of the plate member toward the central portion at the same position, and the fixing bolt 22 is provided in the notch 21a of the adjacent plate member 21. Has been inserted. By inserting the fixing bolt 22 into the notch of the adjacent plate member 21, the front beam 5a and the intermediate beam 5b, and the intermediate beam 5b and the rear beam 5c are connected. The notch 21 a and the fixing bolt 22 are provided on both sides of the beam 5.

4A and 4B show the relationship between the plate member 21 and the fixing bolt 22.
The fixing bolt 22 is held by the rear end beam 5c so as to be rotatable in the horizontal direction, and is rotated in and out of the notch 21a by rotating. When the fixing bolt 22 is inserted into the notch 21a, the intermediate beam 5b and the rear end beam 5c are connected. When the fixing bolt 22 is removed from the notch 21a, the connection between the intermediate beam 5b and the rear end beam 5c is released. Is done.
In the drawing, the connection between the intermediate beam 5b and the rear end beam 5c is shown, but the connection between the front end beam 5a and the intermediate beam 5b is the same.
The fixing bolt 22 may be held by the intermediate beam 5b instead of the front end beam 5a and the rear end beam 5c.
Alternatively, a through hole may be formed instead of the notch, and a fixing pin or bolt may be inserted into the through hole to connect the front beam 5a and the intermediate beam 5b, and the intermediate beam 5b and the rear beam 5c. .

  As shown in FIG. 3, the connecting portion of the front beam 5a and the intermediate beam 5b and the connecting portion of the intermediate beam 5b and the rear beam 5c can be rotated about the horizontal direction orthogonal to the extending direction of the beam 5, respectively. Rotating pins 23 and 24 are provided. When the fixing bolt 22 is removed from the notch 21a and the connection between the front beam 5a and the intermediate beam 5b and the connection between the intermediate beam 5b and the rear beam 5c are released, the front beam 5a and the rear beam 5c rotate. The pins 23 and 24 can be rotated around the center.

  The electric winch 6 is provided above the rear end beam 5c. The wire rope 7 extending from the electric winch 6 is directed toward the distal end side of the distal end beam 5a, is hung on the distal end beam pulley 25 provided at the distal end of the distal end beam 5a, and is folded back to the lower side of the distal end beam 5a. It is fixed to a load meter 26 provided in the vicinity of the connecting portion between 5a and the intermediate beam 5b.

The hanging portion 8 includes a traveling trolley (traveling member) 27 that includes a motor and can travel along the tip beam 5a, and a hook block (hook member) 28 that is provided below the traveling trolley 27 and on which the beam form frame 52 is hung. Consists of The traveling trolley 27 and the hook block 28 are separated from each other.
The traveling trolley 27 includes a pulley 29, and the hook block 28 includes a pulley 30. The traveling trolley 27 and the pulleys 29 and 30 of the hook block 28 are wound around the wire rope 7 together.
Since the wire rope 7 is wound around the pulley 30 of the hook block 28 and the pulley 29 of the traveling trolley 27, the hook block 28 moves in the horizontal direction together with the traveling trolley 27.
Between the traveling trolley 27 and the hook block 28, an overwinding prevention member 31 for preventing the wire rope 7 from overwinding is provided. The overwinding prevention member 31 can be released when the lifting work is not performed.

  As shown in FIG. 5A, holes 32 and 33 are formed in the traveling trolley 27 and the hook block 28. When the lifting operation is not performed, the hole portion 32 and the hole portion 33 can be overlapped by bringing the traveling trolley 27 and the hook block 28 into contact with each other as shown in FIG. A pin (not shown) is inserted into the overlapped hole portion 32 and hole portion 33, whereby the traveling trolley 27 and the hook block 28 can be fixed.

The hook block 28 moves away from the traveling trolley 27 when the wire rope 7 is unwound and moves closer to the traveling trolley 27 when the wire rope 7 is wound up.
When the length of the wire rope 7 is adjusted, the distance between the traveling trolley 27 and the hook block 28 is set, and the traveling trolley 27 is traveled in a state where the winding and feeding of the wire rope 7 are stopped, the hook block 28 can move horizontally with the traveling of the traveling trolley 27 without changing its height.

As shown in FIG. 1A and FIG. 3, the rear end beam 5c is provided with a beam counterweight 34 for maintaining the balance of the beam 5 in a state where there is no suspended load.
A base counterweight 9 shown in FIG. 1A is installed when the weight of the beam counterweight 34 is insufficient, and is detachable from the base 2.

  As shown in FIG. 6, the base counterweight 9 is formed on a steel frame (mounting plate) 41 having a width wider than the width W of the base 2 (see FIG. 1B), and a lower portion of the steel frame 41. A plurality of casters (wheels) 42 installed at intervals wider than the width of the base 2, a weight main body 43 placed on the upper part of the steel frame 41, and projecting downward from the steel frame 41 in the projecting direction The screw jack (contact member) 44 that can be expanded and contracted and a handrail 45 installed on the steel frame 41 are roughly configured.

The base counterweight 9 (9A) mounted on the base 2 is installed so as to cover a part of the base body 11 with the steel frame 41 being separated from the lower surface 41a and the upper surface 11a of the base body 11. At this time, the caster 42 is located on the side of the base body 11.
The screw jack 44 is extended so that the lower end surface 44 a contacts the upper surface 44 a of the base body 11. Since the lower end surface 44 a of the screw jack 44 comes into contact with the upper surface 44 a of the base body 11, the load of the base counterweight 9 acts on the base 2.

The base counterweight 9 is mounted on the base 2 by pushing the handrail 45 and running so that the steel frame 41 covers the base body 11. Then, the screw jack 44 is extended and brought into contact with the upper surface 11 a of the base body 11. The weight main body 43 may be placed before or after the steel frame 41 is aligned.
When the base counterweight 9 is removed from the base 2, the screw jack 44 is contracted to release the contact between the screw jack 44 and the base body 11, and the handrail 45 is pulled to pull the base counterweight 9 from the base 2. Release (9B).

Next, the crane lifting operation of the above-described embodiment will be described.
First, as shown in FIG. 7 (a), the beam 5 is turned by driving the turning wheel 4, and the traveling trolley 27 is moved together with the hook block 28 so that the hook block 28 is placed above the beam formwork 52 to be lifted. Position. Then, the wire rope 7 is fed out by the electric winch 6, the hook block 28 is lowered, and the beam form frame 52 is hung on the hook block 28 with a sling wire.

Next, as shown in FIG. 7B, the wire rope 7 is wound up by the electric winch 6, the hook block 28 is raised, and the beam form frame 52 is lifted. And while turning the beam 5, the position of the traveling trolley 27 is moved, and the beam form frame 52 is lifted above the column form frame 53. Subsequently, the hook block 28 is lowered to install the beam mold frame 52 between the column mold frames 53.
At this time, it is possible to move the hook block 28 horizontally without changing the height by moving the traveling trolley 27 with the hook block 28 having a predetermined height and the length of the wire rope 7 being fixed.

Next, the moving operation of the crane will be described.
First, the overwinding prevention member 31 between the traveling trolley 27 and the hook block 28 shown in FIG. 5 (a) is released, and the traveling trolley 27 and the hook block 28 are brought into contact as shown in FIG. 5 (b). The hole 32 and the hole 33 are overlapped, and a pin is inserted into the hole 32 and the hole 33 to fix the hook block 28 to the traveling trolley 27.
Subsequently, as shown in FIG. 8, the mast 3 is contracted by driving a hydraulic cylinder or the like.

Next, the tip beam 5a is folded.
First, the fixing bolt 22 that fixes the tip beam 5a shown in FIG. 8 is rotated to remove it from the notch 21a, and the connection between the tip beam 5a and the intermediate beam 5b is released. Then, the electric winch 6 is driven to feed out the wire rope 7, and the tip beam 5a is rotated downward about the rotation pin 23 so as to be in the state of FIG.
At this time, as shown in FIG. 9, the tip beam 5a rotated downward comes into contact with a stopper 32 provided on the intermediate beam 5b, and the rotation stops in a state where the tip beam pulley 25 is on the lower side. When the tip beam 5a stops rotating, this state is fixed.

As shown in FIG. 9, holes 35 and 36 are formed in the tip beam 5a and the intermediate beam 5b, and the holes 35 and 36 of the tip beam 5a and the intermediate beam 5b in a state of being rotated and stopped are as follows. It is the structure which mutually overlaps. By inserting a fixing member such as a pin or a bolt (not shown) into the overlapping hole 35 and hole 36, the tip beam 5a is fixed to the intermediate beam 5b in a folded state.
The tip beam 5a and the intermediate beam 5b may be fixed by a fixture other than the holes 35 and 36 and the fixing member.

Subsequently, the rear end beam 5c is folded.
First, the fixing bolt 22 that fixes the rear end beam 5c shown in FIG. 9 in a horizontal state is rotated to be removed from the notch 21a, and the connection between the rear end beam 5c and the intermediate beam 5b is released. Then, the electric winch 6 is driven to feed out the wire rope 7, and the rear end beam 5c is rotated downward about the rotation pin 24 so as to be in the state of FIG.
In addition, you may provide suitably the stopper etc. which contact | abut and stop when the rear end beam 5c rotates, the fixture which fixes the rear end beam 5c and the intermediate beam 5b.

Then, as shown in FIG. 6, the base counterweight 9 is removed from the base 2, and the crane 1 with the base counterweight 9 removed and the base counterweight 9 are transported by another crane, a construction elevator, or the like.
The conveyed crane 1 is installed in a new installation position.

In installing the crane 1, first, the base counterweight 9 is attached to the base 2.
Subsequently, the folded rear end beam 5c and intermediate beam 5b are released from fixation, and the electric rope winch 6 is driven to wind up the wire rope 7 to fix the rear end beam 5c in a horizontal state. Then, the folded tip beam 5a and intermediate beam 5b are released from fixation, and the wire rope 7 is wound up by driving the electric winch 6 to fix the tip beam 5a in a horizontal state.
Subsequently, the mast 3 is extended in accordance with the floor height h, the fixing of the traveling trolley 27 and the hook block 28 is released, and the crane 1 can be used.

Next, the operation of the crane according to the present embodiment described above will be described with reference to the drawings.
In the crane 1 of the present embodiment, when the lifting operation is not performed, the mast 3 can be contracted, and the front end beam 5a and the rear end beam 5c can be folded. 1 is easy to move and install.
And the wire rope 7 is driven by the electric winch 6 that adjusts the height of the suspension portion 8 by extending from the electric winch 6 provided in the rear end beam 5c and the front end portion being fixed to the front end beam 5a. The rotation of the front end beam 5a and the rear end beam 5c can be manipulated.

The hanging portion 8 includes a traveling trolley 27 and a hook block 28, and the pulleys 29 and 30 of the traveling trolley 27 and the hook block 28 are wound around the wire rope 7 together. When the electric winch 6 extends the wire rope 7, the electric winch 6 can move away from the traveling trolley 27 and move downward. When the electric winch 6 winds the wire rope 7, the electric winch 6 approaches the traveling trolley 27. Can move upward.
Then, the length of the wire rope 7 is adjusted to set the hook block 28 to a predetermined height, and when the travel trolley 27 travels in the horizontal direction with the length of the wire rope 7 fixed, the height is increased. The hook block 28 can be moved in the horizontal direction without changing, and it is easy to use.
In addition, since the base counterweight 9 can be attached to and detached from the base 2, the base counterweight 9 can be installed as necessary, and the base counterweight 9 is separated during movement to divide and move heavy objects. Therefore, the movement work can be reduced.

  In the crane 1 by this Embodiment mentioned above, since the crane 1 can be employ | adopted by many processes because the movement and installation of the crane 1 are easy, there exists an effect which can perform construction efficiently.

As mentioned above, although the embodiment of the crane by this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning.
For example, in the above-described embodiment, the base counterweight 9 is provided. However, if there is no problem in the weight balance, the base counterweight 9 may not be provided.
Moreover, in this Embodiment, although the crane 1 is installed for formwork construction, you may install when lifting materials other than a formwork.

1 Crane 2 Base 3 Mast 5 Beam 5a Tip beam (one end member)
5b Intermediate beam (intermediate member)
5c Rear end beam (the other end member)
6 Electric winch 7 Wire rope 8 Lifting upper part 9 Base counterweight (counterweight)
27 Traveling trolley (traveling member)
28 Hook block (hook member)
41 Steel frame (mounting plate)
42 Caster (wheel)
43 Weight body 44 Screw jack (contact member)

Claims (3)

A mast that stands on the base and can expand and contract in the axial direction;
An intermediate member extending in the horizontal direction and positioned in the middle of the extending direction is held at the upper portion of the mast so as to be pivotable in the horizontal direction, and a first end member is provided at one end of the intermediate member in the extending direction. And a second end member connected to the other end of the intermediate member in the extending direction, and the first end member is held movably along the extending direction of the beam. A hanging upper part for lifting an object to be lifted;
An electric winch provided on the second end member;
A wire rope wound up and drawn out by the electric winch to move the suspended portion in the vertical direction;
The first end member and the second end member are rotatable in a vertical direction around a connecting portion with the intermediate member,
The crane, wherein the wire rope extends from the electric winch and has a distal end fixed to the first end member.   The hanging portion includes a traveling member that travels along the first end member, and a hook member that is provided below the traveling member and is separated from the traveling member and on which the lifting object is hung. The crane according to claim 1, wherein both the traveling member and the hook member include a pulley, and the pulley of the traveling member and the hook member are wound around the wire rope together.   The base is provided with a detachable counterweight, and the counterweight is provided on a wheel capable of traveling on an installation surface on which the base is installed, and a weight body is provided on an upper portion of the wheel. And a contact member that is installed on the mounting plate and protrudes downward and expands and contracts in the protruding direction, and is mounted between the mounting plate and the installation surface when mounted. The crane according to claim 1, wherein at least a part of the base is positioned so as to be spaced apart from each other, and the contact member extends downward to contact the base.

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