JP2001073321A - Floor slab separation device equipped with caster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor slab separation device capable of preventing the action of drastic force so that the movement of the device is facilitated and that passing-through part of a steel bar in an objective block to withdraw a floor slab is not damaged before the floor slab is separated. SOLUTION: A floor slab separation device is equipped with a reaction girder 11 having a contact leg section 32 capable of being contacted to both sides of a floor slab block 40, at least a pair of reaction jacks 34 provided to the approximately central part of the reaction girder, a pair of lever members 14 pivoting one end on each of the reaction jacks by separately providing supports 15 and 16 on the reaction girder, hanging bars 20 provided respectively to a pair of lever members for hanging up the floor slab block and casters 16 extended toward a floor slab from the lever members. Then, the casters are arranged to the opposite side at intervals of the supports from pivot sections 17 and 18 between the lever members and reaction jacks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing a concrete slab of a bridge.

[0002]

2. Description of the Related Art In the repair work of concrete slabs of deteriorated bridges, suspension scaffolds are assembled on the side and below the slabs, cross beams of the bridges are reinforced, and existing concrete slabs are removed. Then, a PC precast slab is newly installed, and an apparatus used for removing such a concrete slab is schematically shown in FIGS. 9 and 10.

In FIG. 9, a floor slab peeling device 50 includes a girder 53 disposed on a block 40 to be removed via a stock 54, and a center hole jack fixed to both ends of the girder 53. 52 and a steel rod 51 having a lower end passed through each center hole jack 52 and having a lower end penetrated by the block 40 to be removed. The lower end of the steel rod 51 is fixed to the block 40 to be removed by a nut or the like via a support plate 55. Is done.

FIG. 10 shows a floor slab peeling device 60.
Are the stocks 69 placed on both sides of the removal target block 40,
69, a pair of telescopic jacks 62 suspended from both ends of the reaction girder 66 via mounting members 61, and one end of each of the telescopic jacks 62 pivotally connected to the reaction girder 66. And a steel bar 65 provided on each of the lever members 63 for lifting the removal target block 40. The lower end of the steel bar 65 is provided with a nut or the like via the support plate 65. Is fixed to the block 40 to be removed. The reaction girder 66 is composed of a pair of girder members arranged side by side with slits having a predetermined width, and the respective lever members 63 are inserted into the slits so that the lever members 63 and the girder members can be pivotally connected. 64 is provided as a fulcrum.

[0005]

The conventional apparatus shown in FIGS. 9 and 10 cannot be moved unless the apparatus is lifted by a crane or the like after the floor slab is peeled off. is there.

In the conventional apparatus, a center hole jack 52 and a telescopic jack 62 are used to separate the floor slab.
When the slab is operated, a force is suddenly applied to the portion where the steel bar 51 or the steel bar 65 has penetrated in the removal target block 40 of the floor slab. Particularly, when the floor slab is fragile, the entire floor slab does not peel off. However, there is a disadvantage that only the penetrated portion of the steel bar is damaged.

Further, the apparatus shown in FIG. 10 is not suitable for a complicated construction site where various construction machines are installed because the length of the apparatus is longer than the length of the block to be removed from the floor slab. Also, the telescopic jack 62 in the device of FIG.
Since the hydraulic pump is attached and detached via the hose every time the floor slab is peeled off, there is a drawback that the hose is liable to be clogged with dirt and dust, and the device is easily broken.

Accordingly, the present invention has been made to solve the above-mentioned problems of the conventional apparatus, and an object of the present invention is to provide an apparatus for removing a slab which can easily move the apparatus.

Another object is to prevent a sudden force from acting on the penetrating portion so that the penetrating portion of the steel bar in the block to be removed from the slab is not damaged before the slab is peeled off. It is an object of the present invention to provide a floor slab peeling device which can be used.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided an apparatus for cutting a concrete slab of a bridge and separating the cut slab block from a bridge girder. Reaction girder having a strong grounding leg, at least a pair of reaction force jacks provided substantially at the center of the reaction girder, and a fulcrum separately provided on the reaction girder to each reaction force jack. A pair of lever members having one end pivotally connected thereto, suspension bars respectively connected to the pair of lever members for lifting the floor slab block, and casters extending from each lever member toward the floor slab. The caster is disposed on the opposite side of the pivot between the lever member and the reaction force jack with a fulcrum separated from the pivot, and is located below the ground leg when the reaction force jack is contracted. It is characterized by being comprised in That slab peeling device is provided.

In the floor slab peeling apparatus of the present invention, the caster is disposed on the opposite side of the pivot point between the lever member and the reaction force jack, with the fulcrum separated from the pivot point. When the reaction jack is extended and the levers are kept almost horizontal when the reaction jack is contracted and the levers are almost level, the caster is placed on the floor. Since the ground contact leg is lifted above the floor slab, the floor slab peeling device can be rolled by a caster, and can be easily moved without using a special lifting machine. On the other hand, when the reaction force jack is extended and one end of each lever member is pushed down, the caster rises with the other end of the lever member and separates from the floor slab, and the grounding leg is grounded on the floor slab. Then, a reaction force for peeling the floor slab is obtained from the reaction force girder through the contact leg.

In the floor slab peeling apparatus of the present invention, a continuous member is placed on each of the lever members, and the upper end of the hanging bar is swingably attached to the continuous member. If a non-slip material such as rubber, cloth file or sand is attached to the contact surface with the member, even if it is not fixed to the lever member by mechanical means such as bolts or welding, At the time of the floor slab peeling operation, it is possible to prevent the displacement of the continuous member due to the inclination of the lever member. Therefore, the arrangement of the connecting member on the lever member can be easily changed.

[0013] In the floor slab peeling apparatus of the present invention, each of the lever members may be formed of a pair of long members arranged side by side so as to form a slit having a predetermined width. In this aspect, each of the hanging bars is provided so as to pass through the slit of the long member, and the continuous member is placed on each of the lever members, and the upper end portion of the hanging bar is swingably fixed thereto. Is done.

Further, in the floor slab peeling device of the present invention, three points are connected: a fulcrum of the lever member, a pivotal connection portion between the lever member and the reaction force jack, and an attachment portion of the lever member to which a hanging bar is attached. The fulcrum and the pivot are so arranged that the line forms a triangle, and that the horizontal divergence between the fulcrum and the pivot is longer than the horizontal divergence between the hanging rod mounting portion and the fulcrum. A mounting portion and a mounting portion of the hanging bar can be arranged, and more preferably, a horizontal separation length between the fulcrum and the pivot mounting portion is a horizontal separation between a mounting portion of the hanging bar and the fulcrum. Approximately 1-2 times the length.

[0015] Thereby, the extension operation of the reaction force jack,
The vertical length (downward length) of the lever member and the reaction force jack at the pivot point (point of force) is lowered, and the vertical length (upward length) of the lifting portion of the lever member at which the hanging bar is attached (action point) is raised. ), And the rising length of the action point gradually increases, so that it is possible to prevent a sudden force from acting on the penetrating portion of the steel bar in the removal target block of the floor slab, and However, it can be prevented from being broken before the floor slab is peeled off.

Further, in the floor slab peeling device of the present invention, the reaction girder may be formed by arranging a pair of girder members side by side so as to form a slit having a predetermined width. Each lever member can be inserted into the slit, and each lever member can be pivotally connected by the pivot as the fulcrum provided on the pair of beam members. In this embodiment, the pair of lever members are inserted into the slits of the reaction force girder, so that they are not bulky at the time of transportation and are easy to handle at the time of installation. In addition, since the lever member is inserted into the slit of the reaction girder and is pivotally attached to the reaction girder, the height of the entire apparatus is suppressed, the center of gravity is lowered, and an impact occurs when the floor slab block peels off. However, the device can safely work without falling down.

Further, in the floor slab peeling device of the present invention, a hydraulic supply unit for supplying pressure to the reaction force jack is attached to the reaction force girder, and the hydraulic supply unit and the reaction force jack are connected by a hose. The hydraulic supply unit can be controlled by an operating device connected via a cord, or can be wirelessly controlled by the operating device. As described above, if the hydraulic supply unit including the hydraulic supply unit, the connection hose, and the operating device is provided integrally with the floor slab peeling device, the drawback of the conventional device, that is, the hose and the hydraulic supply unit are clogged with dirt and dust. The drawback that it is easy to break down can be overcome.

[0018]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples.
The present invention is not limited to these. FIG. 1 is a plan view of a floor slab peeling apparatus according to one embodiment of the present invention, and FIG.
Is a longitudinal side view of the floor slab peeling apparatus of FIG. 1, and FIG. 3 is a side view of an end of the floor slab peeling apparatus of FIG. FIGS. 4A and 4B are a cross-sectional view and a side view, respectively, showing a sliding bracket in the floor slab peeling device.
FIG. 5 is a longitudinal sectional view of the floor slab peeling device of FIG.

The floor slab peeling device 10 comprises a reaction girder 11, fulcrum shafts 16 and 16 fixed to the reaction girder 11 via fulcrum brackets 15 and 15, respectively.
A pair of lever members 1 respectively pivotally connected by
4, 14 and a pair of reaction force jacks 3 supported by a jack support member 13 arranged substantially at the center of the reaction force girder 11.
4 and 34, and hanging rods 20 and 20 provided on the pair of lever members 15 and 15, respectively.

Here, the reaction force girder 11 comprises a pair of girder members 1.
The slits 11b are formed between the beam members 11a, 11a by arranging the beam members 1a, 11a in parallel at predetermined intervals, and both ends of the beam members 11a, 11a are connected by a connection plate or the like. At the lower end of both ends of the reaction force girder 11, ground contact legs 32 are protruded. Further, a hydraulic supply unit 12 for supplying pressure to the reaction force jack 34 is fixed to both sides of the reaction force girder 11 as shown in FIG. 1, and the hydraulic supply unit 12 and the reaction force jack 34 are connected to a hose ( (Not shown), and an operating device (not shown) for controlling the hydraulic supply unit 12 is connected by a cord (not shown).

As described above, in the floor slab separating apparatus 10 of the present invention, since the hydraulic supply unit 12 and the like are integrated,
Since these devices can be moved at the same time, the working time can be remarkably reduced as compared with the conventional devices shown in FIGS. That is, in the conventional example of FIG. 9, each time the apparatus is moved, the center hole jack 52, the beam member 53, and the hydraulic supply unit are separately transported and assembled.
The amount of work is large and complicated, and also in the conventional example of FIG. 10, the apparatus and the hydraulic supply unit are carried separately, and therefore have the same complexity. In many cases, the floor slab peeling operation is performed at night, and time constraints are large, and a reduction in working time is strongly required. However, in the floor slab peeling device 10 of the present invention, the hydraulic supply unit 12 Since the movement and installation are efficiently performed by the integration of the above, the above-mentioned problem is solved.

As shown in FIG. 5, a jack support member 13 arranged substantially at the center of the reaction girder 11 has a support column 13a erected on a girder member 11a, and a support beam 13b is provided between the support columns 13a. Is constructed. The upper end of the reaction force jack 34 is fixed to the support beam 13b by a hinge 37,
The lower end of the reaction force jack 34 is hinged to a connecting member 35 connected to the tip of the lever member 14 by a hinge 36. Further, fulcrum brackets 15, 15 are fixed on the beam members 11a, 11a at two opposing positions.

In each of the lever members 14, a pair of shaft members 14a, 14a are juxtaposed at a predetermined interval so as to form a slit 14b, and a fulcrum shaft member 16 is inserted into the upper surface of the shaft members 14a, 14a. Brackets 14c, 14c to be attached are provided to face each other, and a connecting member 35 is continuously provided at the tip, and a lower end of a reaction force jack 34 is attached to the connecting member 35 by a hinge 36.
Pivoted by Here, the shape and arrangement of the connecting member 35 are such that the hinge 36 is connected to the fulcrum shaft member 16 or the hanging rod receiving member 18 described later.
And the hinge 36 and the fulcrum shaft 16
And the hanging rod receiving member 18 are determined so as to form a vertex of a triangle.

A caster support beam 30 is fixed to the rear end of each lever member 14 so as to be substantially orthogonal. For this fixation, through holes are respectively formed at two places communicating with the rear end of the lever member 14 and the caster support beam 30, and a bolt 26 is passed through each through hole, and a lower end is provided with a nut 27.
b is fixed to the lever member 14, and a spring 28
Is provided, and a connection plate 25 for connecting the two bolts 26 from above is provided. The connection plate 25 is fixed on the connection plate 25 with a nut 27a.

At both ends of the caster support beam 30, a column 38 extending toward the floor slab is fixed, and at the lower end of the column 38, a caster 39 is fixed. Since the support column 38 is fixed to the caster support beam 30 by a fixing adjustment bolt indicated by reference numeral 29 in FIG. 3, the height of the caster 39 can be adjusted by rotating the fixing adjustment bolt with a wrench or the like. The casters 39 are shown in FIG.
As shown in FIG. 7, when the lever member 14 is in a substantially horizontal state, the height is adjusted by the above-described height adjusting means 29 so that the lever member 14 is located below the grounding leg 32 and grounds on the floor slab 42.

The hanging bar 20 is inserted into the slit 14 b of each lever member 14, and is slidably and swingably moved by the sliding bracket 17 and the hanging bar receiving member 18.
4 attached. That is, the suspension rod receiving member 18 is provided with a through hole 18b for inserting the suspension rod 20 in a vertical direction, and a swing shaft 18a protrudes on both left and right sides. On the other hand, the sliding bracket 17 is provided with a lever member 14.
A hole 17b communicating with the slit 14b is formed in the bottom surface, and the through hole 1 for inserting the swing shaft 18a of the hanging rod receiving member 18 is provided.
7a are provided on both left and right sides, and a non-slip material 17c is provided on the bottom surface.
A rubber sheet is pasted. The sliding bracket 17 is assembled by welding after the swing shaft 18a of the hanging rod receiving member 18 is inserted into the left and right through holes 17a. The sliding bracket 17 is not fixed to the lever member 14 by a mechanical means such as a bolt or welding, but is simply placed on the upper surface of the lever member 14 and prevented from being displaced by the non-slip member 17c. And therefore the sliding bracket 17
Can be appropriately moved from the position in FIG. 5 to the position in FIG.

The hanging bar 20 is, as shown in FIG.
It is inserted into the through hole 18 b of the hanging rod receiving member 18, and the upper end is fixed by the nut 21 via the support plate 19. Therefore, when a rotational force is applied via the suspension bar 20 during the floor slab peeling operation, the swing shaft 18a of the suspension bar receiving member 18 rotates about the through hole 17a of the slide bracket 17, and the suspension rod 2
0 prevents bending stress from occurring.

Next, the arrangement of the suspension rod 20 on the lever member 14, that is, the suspension rod receiving member 1 to which the suspension rod 20 is fixed
The arrangement of the eight lever members 14 will be described. In the floor slab peeling device 10 of the present embodiment, the hinge 36 on which the force of the reaction force jack 34 acts is the point of force, the fulcrum shaft 16 is the fulcrum, and the hanging rod receiving member 18 is the point of action,
The three points of the action point, the fulcrum and the force point form the vertices of a triangle. As shown in FIG. 8, the horizontal separation length L2 between the fulcrum and the force point is about the horizontal separation length L1 between the action point and the fulcrum. 1-2
Preferably, it is about twice.

With such a three-point arrangement, when the reaction force jack 34 is extended and the power point is pushed downward, the vertical rising length M1 of the application point is larger than the vertical falling length M2 of the power point. Is also shortened, and as shown in FIG.
Since the section movement amount of the action point gradually increases as it rises, the force on the penetrating portion of the hanging bar 20 in the floor slab block 40 also gradually increases, preventing the action of the sudden force and peeling the floor slab. It is prevented that only the penetrating part is broken before.

Next, FIG. 6 is a longitudinal sectional view showing a state where the floor slab is peeled off by the floor slab peeling device 10. The operation of the floor slab peeling device 10 will be described with reference to FIGS. 6 and 5. 5 and 6, the sliding bracket 1
7 and the arrangement of the hanging rod receiving members 18 are different, but this only shows the movable range of the sliding bracket 17, as described above, and moves the position of the sliding bracket 17 during the floor slab peeling operation. is not.

As shown in FIG. 5, in the floor slab peeling device 10, the reaction force jack 34 contracts in the initial state,
4 is held substantially horizontally, and the casters 39 touch the ground on the floor slab 42, while the grounding leg 32 of the reaction force girder 11 rises from the floor slab 42. Therefore, the floor slab peeling device 10 can be rolled and moved by the casters 39, and can be easily moved by pulling the floor slab peeling device 10 by a vehicle or the like without requiring a special lifting machine.

On the other hand, when the floor slab block 40 is peeled, the reaction force jack 34 is extended, and the tip of each lever member 14 is pushed down via the hinge 36. As a result, the rear end of each lever member 14 is pushed up about the fulcrum shaft member 16, and transmitted to the floor slab block 40 as a force for lifting the floor slab through the hanging bar 20, and the floor slab block 40 is moved upward. If the lifting force exceeds a predetermined value, the fixing between the bridge girder and the floor slab block 40 is broken, and the floor slab block 40 is ready to be removed. Also, when the rear end of each lever member 14 is pushed up, the casters 39 move up together with the lever member 14 and separate from the floor slab 42, and the grounding leg 32
The reaction force for contacting the floor 2 and peeling the floor slab block 40 is obtained from the reaction force beam 11 via the contact leg 32.

The floor block 40 whose fixing has been destroyed is appropriately lifted by a crane, loaded on a transport vehicle, and removed.

[Brief description of the drawings]

FIG. 1 is a plan view of a floor slab peeling apparatus according to one embodiment of the present invention.

FIG. 2 is a longitudinal side view of the floor slab peeling device of FIG.

FIG. 3 is a side view of an end of the floor slab peeling device of FIG. 1;

FIGS. 4A and 4B are a cross-sectional view and a side view, respectively, showing a sliding bracket in the floor slab peeling device.

FIG. 5 is a longitudinal sectional view of the floor slab peeling device of FIG. 1;

FIG. 6 is a longitudinal sectional view showing a state where the floor slab is peeled off by the floor slab peeling device.

FIG. 7 is an explanatory diagram of behaviors of a power point and an action point in the floor slab peeling device.

FIG. 8 is an explanatory diagram of an arrangement relationship of a power point, a fulcrum, and an action point in the floor slab peeling device.

FIG. 9 is a simplified diagram shown to explain a conventional floor slab peeling apparatus.

FIG. 10 is a simplified diagram shown for explaining a conventional floor slab peeling apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 floor slab peeling device 11 reaction girder 14 lever member 15 fulcrum bracket (fulcrum) 16 fulcrum shaft (fulcrum) 17 sliding bracket (pivot part) 18 hanging bar receiving material (pivot part) 20 suspension rod 32 grounding leg Part 34 reaction force jack 39 caster 40 floor slab block

Continued on the front page (72) Inventor Kazuaki Itsukaichi 2-16-10 Honcho, Aoba-ku, Sendai-shi, Miyagi Oriental Construction Co., Ltd. Tohoku Branch (72) Inventor Naoki Konno 1-42-5 Chuo, Nakano-ku, Tokyo F-term in the company Protec (reference) 2D059 AA14 GG41

Claims (3)

[Claims] An apparatus for cutting a concrete floor slab of a bridge and peeling the cut floor slab from a bridge girder, wherein the floor slab is provided with grounding legs provided on both sides of the floor slab. A power girder, at least a pair of reaction force jacks provided substantially at the center of the reaction girder, and a pair of fulcrums provided separately on the reaction girder and having one end pivotally attached to each reaction girder. Lever members, and hanging bars respectively provided on the pair of lever members to lift the floor slab block,
A caster extending from each lever member toward the floor slab, wherein the caster is disposed on a side opposite to a fulcrum from a pivot portion between the lever member and the reaction force jack, and The floor slab peeling device is configured to be located below the ground contact leg when the force jack is contracted. 2. A connecting member having a non-slip member on its lower surface is mounted on each of the lever members, and the connecting member swingably connects the upper end of the hanging bar to each of the lever members. The floor slab peeling device according to claim 1, wherein the slab is provided. 3. A line connecting three points of a fulcrum of the lever member, a pivotal connection portion between the lever member and the reaction force jack, and a mounting portion of a hanging bar in the lever member forms a triangle, and , The horizontal separation length between the fulcrum and the pivot portion,
2. The floor according to claim 1, wherein the fulcrum, the pivot portion, and the attachment portion of the suspension bar are arranged so as to be longer than a horizontal separation length between the attachment portion of the suspension bar and the fulcrum. 3. Plate peeling device.