JP2712015B2 - Removal method and device for floor slab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for removing a slab.

[0002]

BACKGROUND OF THE INVENTION Floor slabs are usually reinforced concrete.
To renew a slab due to renovation, the old slab must first be removed. For this reason, the floor slab is cut at a right angle to the girder, divided into strips and removed. However, since the anchor bar on the lower surface of the floor slab is welded to the upper surface of the slab, it cannot be removed unless it is torn or cut off. When the floor slab is forcibly twisted or pulled up, the welded portion often breaks and rises from the girders, but if the welded portion is strong, the anchor streaks come out of the interior of the floor slab, so this is cut off by cutting. After that, the old floor slabs are removed and updated collectively.

[0003] As a prior art of a method of tearing off the anchor bar of a floor slab from a girder, Japanese Patent Publication No. 7-26369 and Japanese Patent Publication No.
26371. In each case, the removal girders (beams) are spread over the floor slabs that have been split and cut into short shapes, and this is supported by the floor slabs on both sides. It is Japanese Patent Publication No. 7-26369 that the tow bar of the center hole jack erected on the removed girder is hung on the hanging hole of the floor slab and forcibly pulled up. In Japanese Patent Publication No. 7-26371, the floor slab and the removal girder are connected by a steel bar, and both ends of the removal girder are pushed up by a normal hydraulic jack.

[0004]

The work of removing the floor slab is literally a site work, and often depends on the labor of the operator.
Therefore, we want to avoid long and heavy tools and equipment.
In the case of the above two inventions, the removal girder that is a size that straddles the floor slab that is normally cut into 2 m widths and that has sufficient bending strength,
It is not easy to push and move even with casters (wheels).
The present invention has taken this as an object.

[0005]

According to the method of removing a slab of the present invention, a concrete slab is divided and cut, and the slab is peeled off one by one from a bridge girder. Open a hanging hole for transportation on the divided floor slab to be peeled, pass a steel rod for lifting, and engage the upper part of the steel rod with the beam,
A fulcrum stand on which one end of the beam is placed on the floor slab, a hydraulic jack on which the other end of the beam is placed is erected on an adjacent floor slab, and the jack pushes up the floor slab together with the other end of the beam, The slab anchor bar is torn off from the slab or pulled out from the slab until fusing is possible.

Further, the lower surface of a fulcrum that can be adjusted up and down attached to one end of the beam is placed on the floor slab, and a downward hydraulic jack attached to the other end of the beam is applied to an adjacent floor slab to press the jack. The floor slab is pushed up together with the beam material by a reaction force, and the floor slab anchor bar is torn off from the spar or pulled out from the floor slab until fusing is possible.

[0007] Furthermore, concrete slabs are divided and cut, and the slabs are peeled off from the girders one by one. Then, when the slabs are to be removed and renewed, a hanging hole for transport is opened in the divided slabs to be peeled. Attach the hangers to one end of the beam, place the fulcrum base near the center of the lower surface of the beam on the adjacent floor slab, and pull the lower end of the tow bar of the center hole jack on the other end of the beam. The outer floor of the adjacent floor slab is engaged with the hanging hole of the adjacent floor slab having a healthy anchor muscle, the other end of the beam is pushed down by the jack, and the floor slab is pushed up together with the hanging tool, A method of removing a floor slab, characterized in that the floor slab anchor bar is torn off from the spar or pulled out of the floor slab until it can be melted.

Alternatively, the concrete slabs are divided and cut, and the concrete slabs are peeled off one by one from the girders. Then, when the slab is to be removed and renewed, a hanging hole for transport is opened in the divided slab to be peeled. Attach the hangers to one end of the beam, place the fulcrum base near the center of the lower surface of the beam on the adjacent floor slab, and pull the lower end of the tow bar of the center hole jack on the other end of the beam. The outer floor of the adjacent floor slab is engaged with the hanging hole of the adjacent floor slab having a healthy anchor muscle, the other end of the beam is pushed down by the jack, and the floor slab is pushed up together with the hanging tool, A method of removing a floor slab, characterized in that the floor slab anchor bar is torn off from the spar or pulled out of the floor slab until it can be melted.

The apparatus for removing a road bridge slab of the present invention is a device used for slab repair work in which concrete slabs are divided and cut, and the slabs are peeled off one by one from a girder and then removed and renewed. A steel rod for lifting that passes through a hanging hole for transportation of the divided floor slab to be peeled off, a beam material that vertically penetrates and supports the steel rod near the center, and puts one end of the beam material standing on the floor slab. A fulcrum base, a hydraulic jack that stands on the adjacent floor slab and mounts the other end of the beam, and wheels attached to brackets extending left and right from both ends of the beam, respectively. It is a removal device.

[0010] A fulcrum that extends downward from one end of the beam so as to be extendable and contractable and rests on the upper surface of the floor slab, and a hydraulic jack that extends downward from the other end of the beam and pushes the upper surface of an adjacent floor slab. And a wheel attached to a bracket extending right and left from both ends of the beam material.

Furthermore, the present invention is a device used for road bridge repair work in which concrete slabs are divided and cut, and each of the slabs is peeled off from the girders one by one and then removed and renewed. A hanging member which is attached to a hanging hole for transportation through a steel rod, a beam member which supports the hanging member at one end thereof, is pivotally supported near the center of the lower surface of the beam member, and is placed on the adjacent floor plate near the floor plate. A fulcrum base, and a center hole jack that stands on the upper surface of the other end of the beam material and engages a lower end of the tow bar with a hanging hole of the adjacent floor slab that has a healthy anchor muscle further outside the adjacent floor slab. This is a floor slab removal device.

[0012] Alternatively, a floor slab carrying tool attached through a steel rod into a carrying hanging hole drilled in a divided slab to be peeled off, and the hanging tool attached to the front ends of left and right beam members extending in the front-rear direction on the lower surface of the vehicle body. Concrete floor slab laying work vehicle with
And a left and right hydraulic jacks for pushing the front end of the work vehicle through the left and right beams, placed on the two slabs on the slab adjacent to the slab, and removing the slab. It is.

[0013]

FIG. 1 shows a state in which a slab to be updated is divided and cut, and hanging holes 1 are formed in each of the divided slabs. The position of the floor anchor bar 3 welded to the spar 2 is also shown. FIG. 2 shows the relationship between the spar 2, the split slab S, and the anchor bar 3, and FIGS. 3 and 4 show the case where the split slab S is lifted off the spar 2 by about 5 cm and is broken at the weld (FIG. 3). )When,
This indicates that the anchor 3 may come out (FIG. 4). In the latter case, the location where the gas escaped with a gas blower or the like is cut off, but the ratio is small.

A comparison between the above-mentioned prior art and the present invention shows that the former is a removal girder (beam material) that straddles the divided floor slab.
In contrast, the present invention has achieved the object only by passing over one side of the split floor slab. 5 and 6 show an example of the simplest embodiment of the present invention. The divided floor slab to be lifted is denoted by S, and the adjacent floor slab that has already been lifted and has been peeled off and has been lowered or has not yet been lifted is denoted by S ′.

The apparatus of the present invention comprises a lifting steel rod 4 passed through a hanging hole 1 on one side of a divided floor slab S, a beam 5 for vertically penetrating and supporting the steel rod 4, and The fulcrum stand 6
A hydraulic jack 7 that stands on the adjacent floor slab S 'and pushes up the other end of the beam 5, and is attached below each of the vertical brackets 8, which are shown only in FIG. The beam 9 is a beam moving wheel. 5 and 6, the device of the present invention is used symmetrically on both sides of the floor slab S, which is well understood. It has changed to a simple beam material 5. Not only the dimensions were short, but also the weight could be reduced in terms of bending strength (section modulus).

As shown in FIGS. 5 and 6, adjacent floor slabs S 'and S'
The two hydraulic jacks 7, 7 above are extended upward, and the steel bars 4, 4 are pulled up on both sides of the floor slab S at the same time.
Floats horizontally. However, depending on the situation at the site, they may be floated one by one. Just float about 5cm. If the beam member 5, the fulcrum base 6, and the jack 7 can be easily separated as shown in FIGS. 5 and 6, two workers can easily move without attaching the wheels 9 in FIG. However, in order to make the preparation work easier, the embodiment of FIGS. The beam member 5 shown in FIG. 8 expands and contracts downward from one end thereof by operating the handle 6a.
And a hydraulic jack 7 downwardly coming into contact with the adjacent floor slab S 'from the other end. Therefore, the beam 5 is pushed and moved by a wheel 9 similar to that shown in FIG. 7 to a required position. Pressing on the floor slab S, extending the jack 7 downward,
′ Can be lowered to float the floor slab S.

The apparatus of the embodiment shown in FIGS. 5 and 6 and FIGS. 8 and 9 can float only one side of the divided floor slab S in one set. Therefore, to float the floor slab S all at once as before,
As shown in FIGS. 5 and 6, two sets of devices must be operated simultaneously. This seems to be unavoidable in the present invention in which the beam is not straddled over the entire width of the floor slab S but the beam is leaned from one side. However, an embodiment showing that the entire width of the divided floor slab can be floated at a stroke by using the beam material from one side of the present invention will be described below.

In the embodiment shown in FIG. 10, the length of the beam 5 is increased from about 1 m in FIGS. 5 and 8 to 4 m, and the fulcrum 6 is located near the center. The hanging tool 1 attached to the tip of the beam 5
The entire width can be lifted at once by putting 0 on both side hanging holes 1 of the divided floor slab S. The fulcrum table 6 is placed on the adjacent floor slab S ', and the tow bar 11a of the center hole jack 11 at the rear end of the beam 5 is passed through the suspension hole 1 of the adjacent floor slab S "in which the outer anchor is not broken yet. At first, the beam 5 is kept horizontal as shown by the broken line, and when the jack 11 pulls up the tow bar 11a, the rear end of the beam 5 is lowered by the reaction force as shown in FIG. , The hanging tool 10 holds the floor slab S by about 5 cm.
Float and break or pull out anchor bars (not shown). Since the beam 5 acting on the lever 5 is sufficiently long on the rear side from the fulcrum 6, even if the anchor bar of the floor slab S is broken, the anchor bar of the adjacent floor slab S ″ is not broken.

Since the beam 5 shown in FIG. 10 is longer than those shown in FIGS. 5 and 8, it is moved by a transport vehicle such as a forklift at the site, but the self-propelled beam 5 is preferable if possible. The embodiment of FIGS. 11 and 12 realizes this. FIG.
The large devices 1 and 12 are the concrete slab laying vehicles 12 originally used for other purposes. This work vehicle 1
The concrete slab to be laid 2 is similar to the split slab of the present invention. However, this work vehicle 12 is merely for transportation, and its chain block 13 has only the strength to raise and lower the concrete slab, and the slab anchor bar cannot be broken.

Therefore, the left and right beam members extending in the front-rear direction on the lower surface of the vehicle body of the work vehicle 12 are extended slightly forward, and the hanging members 10 are attached to the front ends thereof to obtain the beam member 5 of the present invention. In order to float the floor slab S engaged with the hanging tool 10 by about 5 cm as shown in FIG. 11, two hydraulic jacks 7 are placed near the boundary between both slabs on the adjacent floor slab S ′. The front wheel 14 was always floated. In the example shown in the figure, two jacks 7 are also provided in front of the rear wheel 15 so that the entire work vehicle 12 is floated and supported by the four jacks 7. When the floor slab S is floated, the two jacks 7 on the front side may be extended upward to further raise the front end of the beam 5 by about 5 cm. According to this work vehicle 12, one floor slab S is floated at a stroke,
All anchor streaks can be broken.

Although the embodiments have been described one by one, it is needless to say that various changes and applications can be made according to the implementation conditions without changing the gist of each embodiment of the present invention. There are a wide range of applications for designers and field engineers, such as beam shapes, fulcrum shapes, hydraulic jacks, types of center hole jacks, the presence or absence of moving wheels, and the replacement of concrete floor laying work vehicles with similar vehicles.

[0022]

Conventionally, in order to remove a slab from the bridge girder by floating it slightly above the adjacent slab for removal of the slab, a removal girder having both ends supported on the adjacent slab over the slab is considered. It was considered that there was no other way than to lift the floor slab by placing a jack for lifting the floor slab on the (beam material) or pushing up both ends of the removed girder with jacks on the adjacent floor slab. A removal girder supporting both ends on the adjacent slab across the slab was an essential condition. It is a basic form of the present invention to break this common sense and replace long and heavy removal girders that straddle the floor slab with short and light beams that only extend to one side of the floor slab. In addition, as an application form of this idea, a method of lifting the entire width of the floor slab at once using a long beam material protruding onto the floor slab from the adjacent floor slab on one side, or laying a concrete floor slab. The work vehicle was slightly modified, and a method in which the long beam material self-propelled was also presented.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a floor slab.

FIG. 2 is a sectional perspective view of a floor slab.

FIG. 3 is an explanatory view of a fracture state of a welded portion between a floor slab anchor bar and a girder.

FIG. 4 is a diagram illustrating a situation where an anchor bar is pulled out of a floor slab.

FIG. 5 is an elevational view of a basic embodiment of the present invention.

FIG. 6 is an elevational view of a state where the divided floor slab S of FIG. 5 is pulled up.

FIG. 7 is a sectional view taken along line XX of FIG. 5;

FIG. 8 is an elevation view of another embodiment.

FIG. 9 is an elevational view of a state where the divided floor slab S of FIG. 8 is pulled up.

FIG. 10 is an elevation view of another embodiment.

FIG. 11 is an elevation view of yet another embodiment.

FIG. 12 is a side view of FIG. 11;

[Explanation of symbols]

 Reference Signs List 4 steel bar for lifting 5 beam 6 fulcrum 7 hydraulic jack 10 hanging tool 11 center hole jack 12 work vehicle

Claims (8)

(57) [Claims] [Claim 1] A concrete slab is divided and cut, and the slab is peeled off one by one from a girder. Then, when the slab is to be removed and renewed, a hanging hole for transport is formed in the divided slab to be peeled. The upper steel rod is passed through the upper steel rod, the upper part of the steel rod is engaged with the beam, the fulcrum stand on which one end of the beam is placed is erected on the floor slab, and the hydraulic jack on which the other end of the beam is mounted is placed on the adjacent floor slab. Standing on the floor, the jack is pushed up by the jack together with the other end of the beam material, and the anchor of the floor is torn off from the girders or pulled out from the floor until it can be melted. Removal method. 2. A concrete floor slab is divided and cut, and the concrete slab is peeled off one by one from a girder. Then, at the time of the slab repair work for removing and renewing the slab, a hanging hole for transport is opened in the divided slab to be peeled. The upper steel rod is passed through the upper steel rod, the upper part of the steel rod is engaged with the beam, the lower surface of the fulcrum that can be adjusted up and down attached to one end of the beam is placed on the floor slab, and attached to the other end of the beam. A downward hydraulic jack is placed on the adjacent floor slab, and the floor slab is pushed up together with the beam by the pressure reaction force of the jack, and the floor slab anchor bar is torn off from the girder or until the floor slab can be blown. A method for removing a floor slab, wherein the floor slab is removed from the floor. 3. A concrete floor slab is divided and cut, and the concrete slab is peeled off one by one from a girder. Then, in a slab repair work for removing and renewing the concrete slab, a hanging hole for transportation is formed in the divided slab to be peeled. Attach the hangers to one end of the beam, place the fulcrum base near the center of the lower surface of the beam on the adjacent floor slab, and pull the lower end of the tow bar of the center hole jack on the other end of the beam. To
The outer floor of the adjacent floor slab is engaged with the hanging hole of the adjacent floor slab with a healthy anchor muscle, the jack is used to push down the other end of the beam member, and the floor slab is pushed up together with the hanger, and the floor is raised. A method for removing a slab, wherein the slab anchor bar is torn off from the spar or pulled out from the slab until it can be blown. 4. A concrete slab is divided and cut, and the concrete slab is peeled off one by one from a girder. Then, when the slab is renovated to be removed and renewed, a hanging hole for transport is formed in the divided slab to be peeled off. Attach the hanging slab for transporting the floor slab through the upper steel bar, and turn the concrete slab laying work vehicle at right angles to the center of the floor slab. The left and right hydraulic jacks are placed near the boundary between the two slabs on the slab adjacent to the slab, and the jacks push up the slab together with the front end of the work vehicle, so that the anchor of the slab is separated from the girders. A method for removing a floor slab, wherein the floor slab is withdrawn until it can be torn or blown. 5. A device used for renovating a slab in which a concrete slab is divided and cut, and peeled off one by one from a girder, and then removed and renewed, for transporting a divided slab to be peeled. A steel rod for lifting that passes through the hanging hole, a beam member that vertically penetrates and supports the steel bar near the center, a fulcrum stand on which the one end of the beam material stands on the floor slab, and a beam standing on the adjacent floor slab A floor slab removing device comprising: a hydraulic jack on which the other end of the beam is placed; and wheels attached to brackets extending right and left from both ends of the beam. 6. A device used for renovating a slab in which a concrete slab is divided and cut, and the slab is peeled off one by one, and then removed and renewed. A steel rod for lifting that passes through the hanging hole, a beam material that vertically penetrates and supports the steel bar near the center, extends downwardly from one end of the beam material so as to be able to expand and contract,
A fulcrum resting on the upper surface of the floor slab, a hydraulic jack extending downward from the other end of the beam and pressing the upper surface of the adjacent floor slab, and wheels attached to brackets extending left and right from both ends of the beam, respectively. A floor slab removal device, comprising: 7. A device used for road bridge renovation work in which concrete slabs are divided and cut and peeled off from the girders one by one, and then removed and renewed, wherein at least two of the divided slabs to be peeled off. A hanging member which is attached to a hanging hole for transportation through a steel rod, a beam member which supports the hanging member at one end thereof, is pivotally supported near the center of the lower surface of the beam member, and is placed on the adjacent floor plate near the floor plate. A fulcrum base, and a center hole jack that stands on the upper surface of the other end of the beam material and engages a lower end of the tow bar with a hanging hole of the adjacent floor slab that has a healthy anchor muscle further outside the adjacent floor slab. Removal equipment for floor slabs. 8. A device used for floor slab renovation work in which concrete slabs are divided and cut and peeled off one by one from a girder, and then removed and renewed. Slab for transporting a floor slab, which is attached through a steel rod to a suspension hole for use, a concrete slab laying work vehicle provided with a mounting portion for the slab at the front end of left and right beam members extending in the front-rear direction on the underside of the vehicle body, and the floor slab A left and right hydraulic jacks, which are placed near the boundary between the two slabs on the slab adjacent to the slab and push up the front end of the work vehicle via the left and right beams.