JP2004300689A - Mobile pre-cast floor slab erection machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile small-sized and light weight pre-cast floor slab erection machine used in changing work of a pre-cast floor slab of the existing bridge and eliminating assembly and disassembly in the case of transportation. <P>SOLUTION: The pre-cast floor slab erection machine comprises a portal type structural body held by four legs, four non-rail type traveling devices mounting four legs of the portal type structural body, two rails arranged in the longitudinal direction and fixed to the lower part of a rectangular frame type frame of the upper part of the portal type structural body, a rectangular frame type movable rack suspending between two long sides of the frame type movable rack and capable of being moved along the rails, a horizontal beam erected between two long sides of the frame type movable rack and capable of being moved in the longitudinal direction of the frame type movable rack, a suspended device suspending the floor slab hung down to the horizontal beam, one arm placed to the lower part of the central part of one short side of a frame type frame of the upper part of the portal type structural body and capable of being pulled out in the horizontal direction and forward in the longitudinal direction of the frame type movable rack and a strut vertically provided to the front end of the arm. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast slab erection machine used in the replacement work of a precast slab of an existing bridge.
[0002]
2. Description of the Related Art Conventionally, erection of precast slabs on bridges has been carried out using large machines such as truck cranes and forklifts, portal cranes and jib cranes. However, when replacing the precast slab of an existing bridge, the weight of the work machine installed on the slab is limited by the load-carrying capacity of the slab, and during the daytime to secure the bridge's traffic in the daytime. Due to an increase in the number of cases where it is required to stop the work and remove the work machine, the following difficulties have become noticeable in each of the various work machines conventionally used.
[0003]
(1) Truck crane The truck crane can move on its own, and there is no problem in terms of removing equipment during the day. In addition, the minimum turning radius of a cantilever beam of a truck crane when a floor slab is suspended increases, and the beam rotates in a narrow work space such as a truss bridge or other bridge where structures exist on the road surface. And it becomes difficult to supply the floor slab from the rear to the front of the crane truck.
(2) Forklifts Forklifts are also capable of self-propelled operation, and there is no problem in removing equipment during the day. However, modification and installation of lifting equipment is required, and the working radius is smaller than that of truck cranes.
[0004]
(3) Girder Girder is a large-scale facility, and its assembly, disassembly, and transportation are expensive. Therefore, repeated assembling and dismantling at the site is not economically justified and cannot meet the demand for daytime removal of equipment.
(4) Portal crane The portal crane uses steel wheels for its traveling, so laying a special rail is necessary, which requires large equipment. When installing this on an existing floor slab, It is necessary that the weight of the mold crane does not exceed the load bearing capacity of the floor slab. In addition, since assembling, dismantling, and transporting the portal crane are costly, as in the case of the girder, repeating assembly and dismantling is not economically justified, and cannot meet the demand for daytime removal of equipment.
{Circle around (5)} Jib cranes Jib cranes also have large-scale facilities, and therefore have the same mechanical weight limitations and economic problems as the girder and the portal cranes.
[0005]
In view of the above-mentioned prior art, a self-propelled precast slab erection that is used in the replacement work of a precast slab of an existing bridge and that does not require assembly and dismantling during transportation is required. Offer machine.
[0006]
Means for Solving the Problems The present inventor has solved the above problems by the following means.
(1) A portal structure held by four legs, four railless traveling devices (including rubber tires or crawlers, etc.) mounted with four legs of the portal structure, and the gate Two rails arranged and fixed in the longitudinal direction at the lower part of a rectangular frame type frame at the upper part of the mold structure; and two long rails suspended from the two rails, and along the rails. A movable rectangular frame-type movable rack, a cross beam erected between two long sides of the frame-type movable rack, and movable in a longitudinal direction of the frame-type movable rack, and a floor suspended from the horizontal beam. A suspending device for suspending the plate, and a suspending device arranged at the lower part of the center of one of the short sides of the frame-shaped frame above the portal-shaped structure, which can be pulled out horizontally and longitudinally forward of the frame-shaped movable rack. It is characterized in that it is constituted by one arm and one prop suspended from the tip of the arm. Self-propelled precast slab construction machine according to.
(2) A portal structure held by four legs, four railless traveling devices (including rubber tires or crawlers) mounted with four legs of the portal structure, and the gate Two rails arranged and fixed in the longitudinal direction at the lower part of a rectangular frame type frame at the upper part of the mold structure; and two long rails suspended from the two rails, and along the rails. A movable rectangular frame-type movable frame, a cross beam erected between two long sides of the frame-type movable frame, and movable in a longitudinal direction of the frame-type movable frame, and the horizontal beam suspended from the horizontal beam. A suspending device for suspending a floor slab movable along, and a horizontal and frame type movable rack disposed at a lower portion of a central portion of one short side of a frame type frame above the portal type structure. One arm that can be pulled out forward in the longitudinal direction, and one column that is suspended from the tip of the arm. Self-propelled precast slab erection machine characterized by comprising configured.
[0007]
(3) The gate-shaped structure has a structure in which an upper frame-shaped frame and four inverted L-shaped legs are provided, and two short-side portions of the frame-shaped frame are each provided with two square cylinders side by side; The horizontal portion of the inverted L-shaped leg is inserted into the square tube portion on one side from the right and the other on the left side, so that the distance between the left and right legs can be changed. The self-propelled precast floor slab erection machine according to (1) or (2).
(4) The four legs and the struts of the portal structure form a sheath tube structure that can be extended and retracted, and the height of the portal structure can be changed. The self-propelled precast floor slab erection machine according to any one of (1) to (3).
(5) A rectangular frame-type movable rack whose long sides are suspended from the two rails provided and fixed below the frame-type frame of the gate-shaped structure, and which can move along the rails. The floor slab is constructed by adopting a two-stage rail transfer system which is constructed between one long side of the frame type movable rack and one cross beam movable in the longitudinal direction of the frame type movable frame. The self-propelled precast according to any one of (1) to (4), wherein the range of movement of the suspension device for suspending and moving the suspension can be extended to the outside of the portal structure. Floor slab erection machine.
[0008]
(6) A single pillar suspended at the tip of a pull-out arm provided at the lower part of the center of one short side of the frame-shaped frame of the gate-shaped structure, suspending the floor slab. The self-propelled precast floor slab laying machine according to any one of (1) to (5), wherein the device can be safely and easily transported to the outside of the portal structure.
(7) A rotary trolley for rotating the floor slab transferred by the suspension device of the precast floor slab erection machine is disposed between the column and the front leg of the portal structure. The self-propelled precast floor slab erection machine according to any one of (1) to (6).
[0009]
Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view of the embodiment of the present invention at the time of operation, FIG. 2 is an explanatory view showing the configuration of the embodiment of the present invention, the shortening of each member, and the accommodation direction, and FIG. FIG. 4 is a structural view of the embodiment of the present invention at the time of transportation, and FIG. 5 is an explanatory view of the erection operation of the precast slab erection machine in the embodiment of the present invention.
In the figure, 1 is a precast floor slab erection machine, 2 is a frame type frame, 3 is a leg, 4 is a railless traveling device, 5 is a base, 6 is a rail, 7 is an electric slide type suspension device, 7 ′, 7 "" Is a slide type suspension device, 8 is a frame type movable frame, 9 is a cross beam, 10 is a chain block, 11 is a brace, 12 is a support, 13, 13 'and 13 "are floor slabs, 14 is an outrigger, and 15 is a rotation. It is a trolley.
[0010]
【Example】
As shown in FIGS. 1 and 2, the self-propelled precast floor slab erection machine according to the embodiment of the present invention includes a rectangular frame type frame 2 having an upper gate structure and four inverted L-shaped legs 3. And two short sides of the frame-type frame have a structure in which two rectangular cylinders are juxtaposed, respectively, and the two rectangular cylinders each have an inverted L from one side on the right side and the other side from the left side. The horizontal portion of the leg 3 is inserted so that the distance between the legs 3 can be enlarged or reduced. The portal structure is mounted on a prism-shaped base 5 having two sets of right and left two railless traveling devices 4 at the front and rear, and is configured to be capable of self-running.
In addition, two H-shaped rails 6 are disposed and fixed in the lower part of the frame-shaped frame 2 in the longitudinal direction, and the two rails are extended from the two H-shaped rails 6 to the two rails. A rectangular frame type movable frame 8 is movably suspended along the rails via an electric slide type suspending device 7, and slides between two rails 6 forming long sides of the frame type movable frame. A cross beam 9 is movably mounted in the longitudinal direction of the frame-type movable rack via a type hanging device 7 ′, and a chain block 10 as a hanging device movable along the cross beam is mounted on the cross beam 9. Have been.
At the lower part of the center of one of the short sides of the frame-shaped frame 2 of the gate-shaped structure, one arm 11 that can be pulled out in the longitudinal front horizontal direction of the frame-shaped frame 2 is disposed. A pillar 12 is vertically provided at the tip of.
The vertical portions of the four inverted L-shaped legs 3 constituting the portal structure and the support columns 12 have a sheath-type structure that can be extended and contracted, and the short side of the frame 2 of the portal structure. The structure of the work shown in FIGS. 1 and 2 during the operation shown in FIGS. 1 and 2 is reduced by inserting and shortening the attachment structure of the leg 3 to the portion and the pull-out arm bar in the direction shown by the arrow in FIG. The shape of the precast slab erection machine is changed to the shape at the time of transportation shown in FIG.
[0011]
Next, the floor slab erection operation of the precast slab erection machine 1 according to the embodiment of the present invention will be described. The precast floor slab erection machine 1 transported to the work site in the shape shown in FIGS. 3 and 4 self-propelled to a predetermined position by the railless traveling device 4, and then withdraws the leg 3 from the frame type frame 2. The leg 3 is extended, the arm 11 is pulled out, and the column 12 is extended, and is fixed on the floor slab 13 ′ by the outrigger 14 in the shape shown in FIG. At this time, it is also preferable to use a reinforcing brace (not shown) between the leg of the inverted L-shaped leg 3 of the gate-shaped structure and the frame 2 and between the leg 3 and the base 5.
The erection work of the slab 13 by the precast slab erection machine 1 fixed on the slab is performed by taking the slab 13 into the precast slab erection machine 1, that is, suspending the slab 13 on the chain block 10. Lowering, then transporting the suspended floor slab 13 to the erection position, and installation at a predetermined position.
[0012]
First, the floor slab 13 is taken into the precast slab erection machine 1, that is, the floor slab 13 is suspended from the chain block 10. For this purpose, the chain block 10 is moved to the rear part of the precast slab erection machine 1. There is a need to. Accordingly, a frame-type movable rack 8 movably suspended below the frame-type frame 2 of the gate-shaped structure along a rail 6 provided and fixed in the longitudinal direction of the frame-type frame 2, A chain block along the two long sides of the frame-type movable frame 8 erected between the two long-side rails 6 of the movable frame 8 so as to be movable along the rails. 5 is moved in the direction of the arrow shown in FIG. 5A, and the floor slab 13 is hung on the chain block 10 to bring it into the state shown in FIG. 5B.
[0013]
Transfer of the suspended floor slab 13 to the erection position is performed by moving the chain block 10 along the two rails 6 of the frame-type movable rack 8 in the direction of the arrow in FIG. This is achieved as the state shown in FIG.
Thereafter, the chain block 10 is moved right and left along the cross beam 9 to lower while finely adjusting the position of the floor slab 13, and the floor slab 13 is set at a position indicated by 13 "in FIG. Finish the work.
In addition, what is shown as 13 'in FIG. 5 is an existing floor slab. After laying the floor slab 13 ", the precast floor slab laying machine is moved forward on this and the next floor slab is replaced. .
[0014]
When replacing the floor slab of the bridge, as shown in FIG. 5A, the existing floor slab 13 'of the part to be replaced has already been removed to form a space. Therefore, the precast floor slab erection machine 1 has no choice but to be installed in front of it. In order to install a new slab 13 in such a state, the floor slab 13 is greatly extended in front of the precast slab erection machine 1. Need to be kept. However, if a heavy slab is protruded forward, the precast slab erection machine 1 may lose its balance. To prevent this, measures such as increasing the weight of the precast slab slab erection machine 1 are necessary. However, the weight cannot be increased beyond the load-carrying capacity of the bridge slab, and there is a strong demand for weight reduction from the viewpoint of transportation.
In the embodiment of the present invention, the column 13 hanging at the tip of the arm 11 pulled out in front of the precast slab erection machine 1 is replaced with the existing slab 13 at the tip of the detached slab as shown in FIG. The precast floor slab erection machine 1 is stabilized and lightened by fixing it on the bridge or on the bridge girder.
[0015]
When the long side of the rectangular floor slab 13 is installed in the width direction of the bridge, the short side of the rectangular floor slab 13 is transported by the self-propelled precast floor slab erection machine, and then the support 12 and the gate are connected. The car is rotated 90 ° by a rotating carriage 15 arranged between the front leg 3 of the mold structure and the width of the rotatable floor slab is increased by the distance between the column 12 and the front leg 3 of the portal structure. Limited to length range.
[0016]
According to the present invention, the following effects can be obtained.
(1) Since it is provided with a railless traveling device, it can be moved and installed at any position, and does not damage the floor slab due to the movement.
(2) Since the chain block is suspended from the gate-shaped structure via two rails of a frame-type movable frame that protrudes greatly in front of the gate-shaped structure, the chain block has entered directly below the gate-shaped structure. The precast slab can be suspended from the truck directly on the chain block and transferred to the front of the portal structure as it is, so that the slab can be set at a predetermined position. The fear that the precast floor slab erection machine lacks a balance due to the chain block projecting forward of the portal structure may be caused by a brace pulled out forward from the portal structure and a post suspended from the tip thereof. And all operations can be performed stably.
(3) By providing the support in front, the reaction force of the device at the time of erection can be distributed to five places, so that the load bearing capacity of the existing floor slab can be sufficiently cleared.
(4) Since the precast slab erection machine can be configured to be light in weight, even if it is installed on the existing slab and works, the influence on the existing slab and the bridge is small.
(5) The height and width of the precast floor slab erection machine can be reduced to dimensions that can be loaded on one truck (in the embodiment, the height is 2.4 m and the width is 2.22 m). It does not need to be disassembled and does not require any special permission under the Road Traffic Act for transportation.
(6) As described in (5) above, the precast deck slab laying machine can be transported to the site by truck without disassembly and can be lowered by self-propelling by attaching a ramp to the loading platform. Since no heavy equipment such as a crane is required for transporting the equipment, and no assembling work is required, the work can be started in a short time.
(7) When the precast slab is installed, fine adjustment of the position in the bridge axis direction and the same perpendicular direction is possible, so that the erection becomes easy.
(8) A floor slab with a width of about 8 m can be erected by using a rotating cart together.
(9) Total costs including transportation costs, disassembly costs, etc. can be reduced.
(10) Workability is good and the process can be shortened.
(11) Since the size is within the building limits even during precast slab erection work, it can be used for all bridges regardless of bridge type and bridge scale.
(12) Since the precast floor slab erection machine is a self-propelled type, it can be easily removed, and can easily meet a demand for securing bridge traffic in the daytime even during the floor slab replacement work.
[Brief description of the drawings]
FIG. 1 is a perspective view of a working example of the present invention.
FIG. 2 is an explanatory view showing the configuration of the embodiment of the present invention and the shortening and accommodating directions of each member.
FIG. 3 is a perspective view of the embodiment of the present invention during transportation.
FIG. 4 is a configuration diagram of the embodiment of the present invention during transportation.
FIG. 5 is an explanatory view of the erection operation of the precast slab erection machine of the embodiment of the present invention.
[Explanation of symbols]
1: Precast floor slab erection machine 2: Frame type frame 3: Leg 4: Railless traveling device 5: Base 6: Rail 7: Electric slide type suspension device 7 ', 7 ": Slide type suspension device 8: Frame type movable frame 9: Cross beam 10: Chain block 11: Arm bar 12: Post 13, 13 ', 13 ": Floor slab 14: Outrigger 15: Rotating trolley

Claims (7)

A portal structure held by four legs, four railless traveling devices (including rubber tires or crawlers) mounted with four legs of the portal structure, and the portal structure Two rails arranged and fixed in the longitudinal direction at the lower part of an upper rectangular frame type frame, and long sides of each of the two rails are suspended from the two rails and are movable along the rails A rectangular frame-type movable rack, a horizontal beam erected between two long sides of the frame-type movable frame, and movable in a longitudinal direction of the frame-type movable frame, and a floor slab suspended from the horizontal beam. A suspending device for lowering, and one of the frame-shaped frames on the upper part of the gate-shaped structure, which is disposed below a central part of one short side of the frame-shaped frame and can be pulled out in a horizontal direction and a longitudinally forward direction of the frame-shaped movable rack. Characterized by being constituted by a crosspiece and a single post suspended from the tip of the crosspiece. Self-propelled precast slab erection machine. A portal structure held by four legs, four railless traveling devices (including rubber tires or crawlers) mounted with four legs of the portal structure, and the portal structure Two rails arranged and fixed in the longitudinal direction at the lower part of an upper rectangular frame type frame, and long sides of each of the two rails are suspended from the two rails and are movable along the rails A rectangular frame-type movable frame, a cross beam erected between two long sides of the frame-type movable frame, and movable in the longitudinal direction of the frame-type movable frame, and suspended along the horizontal beam and along the horizontal beam. A suspending device for suspending a movable floor slab, and a suspending device disposed at a central lower portion of one short side of a frame-shaped frame above the portal-shaped structure, horizontally and longitudinally forward of the frame-shaped movable rack. The arm consists of one arm that can be pulled out from the arm and one pillar that is suspended from the tip of the arm. Self-propelled precast slab erection machine characterized by comprising been. The gate-shaped structure has a structure in which an upper frame-shaped frame and four inverted L-shaped legs are provided, and a short side of the frame-shaped frame has two square tubes arranged side by side. The space between left and right legs can be changed by inserting a horizontal portion of the inverted L-shaped leg into one part from the right side and the other from the left side. 2. The self-propelled precast floor slab erection machine according to 2. The four legs and the struts of the portal structure form a sheath tube structure that can be extended and retracted, and the height of the portal structure can be changed. The self-propelled precast floor slab erection machine according to any one of the above items. A rectangular frame-type movable rack whose long sides are hung on the two rails disposed and fixed below the frame-type frame of the portal-type structure and movable along the rails; The floor slab is suspended by adopting a two-stage rail transfer system which is constructed between two long sides of the mold movable frame and is composed of one cross beam movable in the longitudinal direction of the frame movable frame. The self-propelled precast floor slab erection machine according to any one of claims 1 to 4, wherein the range of movement of the hanging device to be moved can be extended to the outside of the portal structure. One pillar suspended from the tip of a pull-out arm provided at the lower part of the center of one short side of the frame-shaped frame of the portal-type structure is used as a gate of a suspension device that suspends a floor slab. The self-propelled precast floor slab erection machine according to any one of claims 1 to 5, wherein the transfer to the outside of the mold structure is enabled safely and easily. 2. A rotating truck on which a floor slab transferred by a hanging device of a precast slab erection machine is mounted and rotated, and the rotating trolley is arranged between a column and a front leg of a portal-type structure. The self-propelled precast floor slab erection machine according to any one of claims 1 to 6.

Images