JP3695716B2 - Floor slab separator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is an apparatus used when removing a concrete old floor slab installed on a main girder such as a bridge and installing a new floor slab, the floor slab divided by cutting into the old floor slab The present invention relates to a floor slab separating device for cutting off the edge from the periphery.
[0002]
[Prior art]
It is necessary to remove the old floor slab and install the new floor slab for the steel slab concrete slab that has passed many years after construction. Since there are many reinforced concrete slabs supported by the main girder as old slabs, when removing them, they must be cut into a predetermined size and carried out. Also, the floor slab is connected integrally with the main girder flange and the gibber bar, etc., so this part is released by static breakage by concrete breaker, core cutter or expansion material injection, then pushed up by the jack and lifted from the main girder After confirming the separation, a hanging tool is attached to the old floor slab and removed.
[0003]
Here, the conventional floor slab separating apparatus described in Patent Document 1 will be described with reference to FIG. When separating the floor slab, first, a split floor slab 102 is formed by making a cut at a predetermined location with a concrete cutter or the like and cutting the gibber streaks. A conventional floor slab separating apparatus 101 for cutting off the divided floor slab 102 from a peripheral contact surface such as a main girder has a table 103 placed on both sides of the divided floor slab 102 and the divided floor slab 102 supported by these. , A pair of jacks 105, 105 provided on the beam member 104, and a PC steel rod 106 through which each jack 105 and the divided floor slab 102 are inserted.
[0004]
The PC steel bar 106 can move up and down by the action of the jack 105, passes through the hole or gap formed in the beam member 104 and the divided floor slab 102, and protrudes from the lower surface of the divided floor slab 102. A washer 106a and a nut 106b were attached.
[0005]
When cutting the divided floor slab 102, the jack 105 is operated to raise its lower surface, and after the divided floor slab 102 is separated from the main girder, the PC steel bar 106 is lowered and lowered onto the main girder, After the plate separating apparatus 101 was moved, a lifting tool was attached to the hole formed in the divided floor slab 102 and lifted by a crane to be removed.
[0006]
[Patent Document 1]
JP-A-9-59919 (FIG. 4)
[0007]
[Problems to be solved by the invention]
However, since the conventional floor slab separating apparatus 101 has a configuration in which the divided floor slab 102 is directly pulled up by the jack 105, there is a drawback in that the load of the jack 105 acting during the separation becomes large. Further, in order to lift the divided floor slab 102 evenly, it is necessary to adjust the lifting lengths of the plurality of jacks 105, but this difference in length directly becomes the difference in floor slab displacement. There was a drawback that the work that had to be done was complicated.
[0008]
The present invention has been made to solve the problems of conventional floor slab separating devices, and can be separated even when the jack load is small, and the length of the jack is not frequently adjusted. An object of the present invention is to provide a floor slab separating device that can lift the floor slab evenly.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a floor slab separating apparatus according to the present invention is for cutting a divided floor slab formed by cutting a concrete old floor slab erected on a main girder from its surrounding contact surface. In the floor slab separating device, at least a pair of wedge-shaped sliding racks that are placed opposite to each other on the floor decks outside the divided floor decks, and sliding surfaces are provided on the upper and lower surfaces, on the slopes of the racks. A feed piece that is movably mounted; a beam member that spans the split floor slab while supporting both ends of the pair of feed pieces; and a reaction force stand that is interposed between the beam member and the split floor slab. And a tight steel member for connecting the divided floor slab to the beam member, and a jack capable of ascending along the slope of the wedge-shaped sliding frame with the feed piece fixed at one end to the reaction force frame and coupled to the other end. It is characterized by.
[0010]
The pair of wedge-shaped slide mounts are attached with, for example, a connecting frame material on the outer periphery so that the position thereof is fixed. The frame member may be provided with a moving wheel. The feed piece is a trapezoidal member having a horizontal upper surface and a lower surface having the same slope as the wedge-shaped slide base, and moves while contacting the lower surface of the beam material and the slope of the slide base. Since friction is generated on the contact surface during this movement, a sliding auxiliary material such as a Teflon (registered trademark) plate is adhered to the sliding surface of the feed piece and / or the beam material lower surface / sliding frame slope.
[0011]
The beam material also behaves as a unit with the divided floor slabs that are fixed to the reaction force frame and connected by tight steel. Therefore, when the feed piece rises on the slope of the slide base, the end of the beam is pushed up and the divided floor slab rises at the same time. Since the rate of increase of the beam material is small compared to the extrusion length of the jack, adjusting the length of the jack for evenly pushing up is relatively simple.
[0012]
Generally, if the frictional resistance is reduced and the slope of the slide base slope is set small, the necessary lifting force can be applied with a smaller jacking force. In order to achieve the required lifting force P with a jacking force of about 0.8 P, the slope of the slide base slope is desirably 20 ° or less, and the friction coefficient is desirably μ = 0.1 or less.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a plan view of a floor slab separating apparatus, and FIG. 2 is a cross-sectional view showing a II-II cross section of FIG. The floor slab separating apparatus 1 includes a pair of wedge-shaped slide bases 4 and 4 placed on the floor slabs 3 and 3 adjacent to the divided floor slab 2, feed frames 5 and 5 placed on each base slope 4a, A beam member 6 that supports both ends of the feed frame 5, a reaction force stand 7 that is interposed between the beam member 6 on the lower surface of the beam member 6 and the divided floor slab 2, and a tight coupling that connects the divided floor slab 2 to the beam member 6. It consists of a steel material 8 and a pair of jacks 9, 9 having one end fixed to the reaction force stand 7 and the other end pin-coupled to each feed piece 5.
[0014]
The pair of wedge-shaped slide mounts 4 and 4 are fixed by attaching the frame material 10 to the outer periphery so that the distance between them does not shift. If the detachable moving wheel 11 is provided on the connecting frame member 10, the apparatus can be easily moved after the slab separation. The feed piece 5 is a trapezoidal member whose upper surface 5a is horizontal and whose lower surface 5b has the same gradient as the gantry slope 4a, and a Teflon (registered trademark) plate is attached to the upper and lower surfaces.
[0015]
The beam member 6 is, for example, manufactured by arranging two grooved steel webs back to back with a slight gap therebetween, and the tight steel member 8 is inserted into the gap. The binding steel material 8 is preferably an all-screw type PC steel bar. A bearing plate 8a is provided on the upper surface of the beam material and the lower surface of the divided floor slab, and the beam 6 and the divided floor slab 2 are connected by screwing a nut 8b. The divided floor slab 2 is previously drilled with a hole for inserting a steel material.
[0016]
A plurality of the above-described floor slab separating apparatuses 1 are arranged at appropriate locations on the divided floor slab 2 and are operated simultaneously to perform separation work. An example of the arrangement is shown in FIG. FIG. 3 is a cross-sectional view of a bridge slab to which a floor slab separating device is attached. The old concrete slab erected on the main girder 12 is cut in a direction perpendicular to the bridge axis to form one elongated divided slab 2. Since the upper surface of the main girder 12 and the divided floor slab 2 are connected by a gibber bar or the like, after releasing this, the pair of floor slab separating devices 1 and 1 are arranged in parallel to the bridge axis direction.
[0017]
After the beam material 6 is connected to the divided floor slab 2 with the tight steel material 8 to be inserted, each jack 9 is extended while interlocking, and the feed piece 5 is moved while being in contact with the beam material 6 and the gantry slope 4a. At this time, the feed piece 5 ascends along the pedestal slope 4a as shown in FIG. 4, so that both ends of the beam member 6 are pushed up, so that the divided floor slab 2 connected by the binding steel member 8 is also pulled up simultaneously.
[0018]
Compared with the extrusion length of the feed piece 5 by the jack 9, the rate of rise of the beam material 6 is very small, so even if there is a slight difference in the extension degree of each jack 9, there is almost no difference in the height of the beam material 6. Is not seen. That is, an even separation operation can be easily achieved.
[0019]
In addition, when a wedge-type push-up device is used, a necessary push-up force can be applied with a smaller jack force. For example, Japanese Patent Publication No. 4-54002 discloses a wedge-type jack-up device for repairing and replacing a bridge support. The wedge gradient is 2.3 ° to 8.5 °, and the coefficient of friction is If μ = 0.07, an experimental result is described that makes it possible to push up with a horizontal force of about 1/2 to 1/5 of the required vertical load. In the case of the floor slab separating apparatus 1 of the present invention, the slope of the gantry slope 4a is desirably 20 ° or less, and the friction coefficient in that case is desirably μ = 0.1 or less.
[0020]
After confirming the separation from the main girder 12 by pushing out the jack 9, the divided floor slab 2 is again lowered onto the main girder 12, and then the floor slab separating apparatus 1 is moved. Using a hole for inserting the tight steel 8 formed in the divided floor board 2, a hanging tool (not shown) is attached thereto, and the removal is completed by a crane or the like.
[0021]
【The invention's effect】
As described above, the floor slab separating apparatus of the present invention has a structure in which the beam material integrated with the divided floor slab is pushed up by the action of the feed piece placed on the wedge-shaped slide base, so even if the load of the jack is small Work to push up and separate the floor slab from the main girder is possible, and the rate of rise of the beam material is very small compared to the extrusion length of the feed frame by the jack, so even if the jack length is not adjusted frequently It is possible to raise the floor slab.
[Brief description of the drawings]
FIG. 1 is a plan view of a floor slab separating apparatus.
FIG. 2 is a cross-sectional view showing a II-II cross section of FIG.
FIG. 3 is a cross-sectional view of a bridge floor slab to which a floor slab separating device is attached.
FIG. 4 is a cross-sectional view of a floor slab separating apparatus when a divided floor slab is pulled up.
FIG. 5 is a perspective view of a conventional floor slab separating apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Floor slab separation apparatus 2 Divided floor slab 3 Floor slab 4 Wedge-shaped slide mount 5 Feeding piece 6 Beam material 7 Reaction force mount 8 Tightened steel material 9 Jack

Claims (1)

In a floor slab separating apparatus for cutting a divided floor slab formed by cutting a concrete old floor slab erected on a main girder from a peripheral contact surface thereof, the floor slab outside the divided floor slab At least a pair of wedge-shaped sliding racks that are placed opposite to each other at the tip of the slope, a feed piece that is provided with a sliding surface on the upper and lower surfaces, and that is movably placed on the slope of the carriage, A beam material that crosses over the divided floor slab while supporting, a reaction force frame interposed between the beam material and the divided floor slab, a binding steel material that connects the divided floor slab to the beam material, A floor slab separating apparatus comprising: a jack capable of ascending the feed piece, which is fixed at one end to the reaction force frame and coupled to the other end, along the slope of the wedge-shaped slide frame.

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