JP2001081731A - Method and device for demolishing floor slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a demolishing method of a floor slab capable of simply and efficiently demolishing a floor slab without requiring a large and heavy device such as a hydraulic device. SOLUTION: In this demolishing method of a floor slab, the floor slab C is cut into a plurality of blocks and a beam member 11 is hung over between both side blocks adjacent to a block to be removed. A through hole 20 is formed in the block to be removed. A hanging bar 21 provided with threads is formed to vertically pierce the through hole 20 and a beam member 11 formed in the block to be removed. The hanging bar 21 is fixed between the block and the beam member 11 by screwing nuts 24 from the lower face of the block to be removed and the upper face of the beam respectively and then, the nut 24 is rotated by a means rotating a nut and the hanging bar 20 is raised to hang up the block to be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dismantling a concrete slab used for a road surface such as a highway or a bridge.

[0002]

2. Description of the Related Art As a method of dismantling a concrete slab which needs to be replaced due to deterioration or the like, for example, there is a method of dividing and crushing the slab to an appropriate size using a crushing device such as a concrete breaker. However, in this method, there is a problem that the noise of the crushing device is loud, and that the concrete pieces after crushing fall by a considerable amount, and that the processing requires time and labor.

[0003] A floor slab dismantling method that solves such a problem is disclosed, for example, in Japanese Patent No. 2014555.

In this method, a floor slab is cut into blocks of a size that can be carried out by a truck or the like using a concrete cutter, and a block to be removed is provided with through holes penetrating the upper and lower surfaces thereof, and is adjacent to the block. Hang the lifting girder with the fulcrum on the blocks on both sides. Next, a center hole jack is installed on the lifting girder, a steel rod penetrated through the through hole is attached to the center hole jack, and the floor slab and the center hole jack are connected. The floor slab is dismantled by lifting the slab.

According to this method, the above-mentioned problems of the conventional method can be solved. However, the weight and size of the entire apparatus for dismantling, such as a lifting girder, a center hole jack and a driving device (hydraulic pump) thereof, are disclosed. However, there is a problem that the disassembly apparatus itself takes time and labor to install and remove, and the disassembly apparatus is bulky and may fall down.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and proposes a method for dismantling a concrete slab with a relatively simple and lightweight structure and procedure.

[0007]

In other words, according to the method for dismantling a floor slab according to the present invention, the floor slab is cut into a plurality of blocks, and a beam material is bridged between the blocks on both sides adjacent to the block to be removed. And a hanging bar provided with a thread is vertically penetrated through the through-hole and the beam member provided in the removing block, and the lower surface of the removing block and the upper surface of the beam are provided in the hanging bar. Then, the hanging rod is fixed between the block and the beam member by screwing a nut from each, and then the nut is rotated by a nut rotating means to raise the hanging rod, thereby removing the hanging rod. It is characterized by lifting a block.

[0008] In the floor slab dismantling method according to the present invention, a beam is hung over the floor slab, and a hanging rod is passed through the floor slab and the beam.
This is screwed and fixed to the nut, and then the nut is rotated in the fastening direction to pull up the hanging bar to lift the floor slab. Therefore, the device for disassembly has a simple configuration that does not require a relatively heavy and large-scale device such as a jack or a hydraulic device, and at the same time, the weight can be reduced. In addition, the work of dismantling the floor slab can be performed easily and at low cost with a relatively small number of people. Further, the installation and removal of the device for dismantling work becomes easy.

In the floor slab dismantling method according to the present invention, the nut rotating means has a length corresponding to a lifting length of the hanging bar, which is necessary for separating the block to be removed from the adjacent block. And a socket for engaging the nut. Thereby, it is possible to secure a stroke necessary for lifting the hanging bar, that is, for lifting the floor slab.

Further, the floor slab dismantling method according to the present invention is characterized in that an electric wrench is used for the nut rotating means. Therefore, a large-sized and heavy device such as a hydraulic pump is not required, the structure of the device for disassembly is very simple, and the disassembly operation can be performed easily and at low cost.

[0011] The present invention also relates to an apparatus for dismantling a floor slab.

[0012] The floor slab demolition apparatus according to the present invention is provided with a beam member to be bridged between blocks on both sides adjacent to a block to be removed, and a screw thread penetrating through the through hole provided in the beam member and the block to be removed. A hanging rod, a nut for fixing the hanging rod between the beam member and the removing block, and a nut rotating device for rotating the nut, in a direction in which the nut is fastened by the nut rotating device. The block to be removed is lifted by rotating the lifting rod to raise the lifting block.

The floor slab dismantling device according to the present invention does not require a relatively heavy and large-scale device such as a jack or a hydraulic pump, and can realize a simple structure and a light weight. Also, the work of dismantling the floor slab can be performed easily and at low cost with a relatively small number of people. Further, installation and removal of the device for dismantling are easy.

In the floor slab dismantling device according to the present invention, the nut rotating device has a length corresponding to a lifting length of the hanging bar, which is necessary for separating the block to be removed from the adjacent block. And a socket for engaging the nut. Therefore, it is possible to secure a stroke required for lifting the hanging bar, that is, lifting the floor slab. Further, the present device is characterized in that the nut rotating device is an electric wrench. Therefore, a large-sized and heavy device such as a hydraulic pump is not required, the structure of the device for disassembly is very simple, and the disassembly operation can be performed easily and at low cost.

[0015]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show a slab dismantling operation using a slab dismantling apparatus according to the present invention. FIG. 1 is a side view, FIG. 2 is a plan view, and FIG. Show.

The floor slab demolition device 10 installed for removing the illustrated floor slab C is stretched over the floor slab C to be removed and between the adjacent floor slabs C ′ and C ″. A beam member 11 is mounted on a base 12 provided on floor slabs C ′ and C ″, respectively. Also beam members
11 consists of two section steels 11A and 11B, both of which are connecting plates
They are linked by 13, 14, and 15. In addition, these steel molds
To 11A and 11B, substantially trapezoidal reinforcing ribs 16 and 17 and substantially rectangular reinforcing ribs 18 and 19 are attached by welding, respectively. Note that the floor slabs C, C ′ and C ″ have been cut into appropriate sizes before removal. In the illustrated example, the floor slab demolition device 10 for removing the floor slab C is used. It is assumed that two units are provided.

The floor slab C is provided with a through hole 20, and a threaded steel rod 21 is passed through the through hole 20 and the floor slab dismantling device 10. By 24, it is fixed to the floor slab C and the dismantling device 10. 1 is an electric wrench (nut runner), and when the floor slab is disassembled by this apparatus,
The nut 24 is rotated in the fastening direction by the electric wrench 25 and the steel bar 21 is pulled up to lift and remove the floor slab C.

FIGS. 4 to 6 show the beam members 11 of the floor slab demolition apparatus 10. FIG.
It shows only one. As is apparent from FIGS. 5 and 6, the beam member 11 is parallel to the two channel steels 11A and 11B with a gap provided so that a threaded steel rod 21 (not shown) can penetrate between them. The connecting plates 13 to 15 are attached by welding to connect them. As the beam member 11, besides the channel steel, for example, H
It is also possible to use two parallel shaped steels or I-shaped steels,
Alternatively, the beam member 11 may be made of a single steel die, and a web of this steel die may be provided with a through hole through which the threaded steel rod 21 passes.

The caster 2 is attached to the beam member 11 shown in FIG.
6 is installed. This is for moving the beam member 11 at the time of installation and removal of the device 10 for the floor slab demolition work, and is detachable in the illustrated example.
That is, the casters 26 are removed as shown in FIG. 1 at the time of the floor slab dismantling work, and are reattached when the apparatus 10 is removed after the work is completed. It is needless to say that the casters 26 may not be detached from the beam member 11 by welding or the like.

In the example shown in FIG. 4B, the anchor plate 22 is detachably fixed by a clamp 27. The anchor plate 22 may use other fixing means as needed, or may be permanently fixed to the beam member 11 by welding. In addition, anchor plate
22 has a through hole 22a through which a threaded steel rod 21 penetrates (see FIGS. 1 and 2).

FIG. 7 shows the appearance of the electric wrench 25. The electric wrench 25 includes a main body 28 and a socket 29 mounted on the main body 28. Inside the main body 28, a motor for rotating the socket 29, a power supply, and the like are housed. As shown in FIG. 7B, a chuck 30 is provided at the end of the socket 29 on the main body mounting side, and this is connected to a drive shaft (not shown) of the main body 28. On the other hand, a wrench hole 31 is provided at the other end, and a nut to be fastened or removed is fitted into the wrench hole 31. Further, a through hole 32 penetrating the inside of the socket 29 is a hole through which a bolt or the like passes when a nut is fastened or removed. In the present invention, the main body of the electric wrench 25
As 28, a conventional one can be used.

In the illustrated electric wrench 25, a socket
29 is longer than a regular socket. This is in the dismantling of the slab using the device 10 according to the invention,
This is because when the threaded steel bar rises by rotating the nut, a height (stroke) sufficient to remove the floor slab can be obtained. The length of the socket is arbitrarily set according to the thickness of the floor slab or the like, and a plurality of sockets having different lengths may be prepared accordingly.

Next, a procedure for dismantling a slab by the above-described slab disassembling apparatus will be described.

First, the concrete slab to be dismantled is cut into blocks of an appropriate size, and the through holes 20 are drilled. Next, the floor slab dismantling device 10 is moved onto a floor slab block (floor slab C in FIG. 1) from which the slab is to be removed, and floor slabs on both sides of this block (FIG.
In this example, the beam member 11 is placed on the base 12 installed on the floor slabs C ′ and C ″). At this time, the threaded steel rod in the beam member 11
The position of the through hole 21 of the floor slab C (the gap between the shape steels 11A and 11B in FIG. 1) and the through hole 20 of the floor slab C are aligned. Here, the casters 26 (see FIG. 4) below the beam members 11 may be left attached or removed. In FIG. 2, two floor slab dismantling devices 10 are arranged in parallel.

Next, the threaded steel rod 21 is inserted between the channel steels 11A and 11B of the beam member 11 and into the through holes 21 provided in the floor slab C, and the beam 24 is fixed to the beam 24 with the nuts 24 via the anchor plates 22 and 23. It is fixed to each of the member 11 and the floor slab C. As a result, the floor slab demolition device 10 and the floor slab C are connected via the threaded steel bar 21.

Thereafter, the operator uses the electric wrench 25 to
The nut 24 fixing the threaded steel bar 21 to the beam member 11 of the floor slab demolition device 10 is rotated in the fastening direction. At this time, the threaded steel bar 21 is fixed to the floor slab. Therefore, by rotating the nut 24 on the beam member 11 side, the threaded steel bar 21 rises. Therefore, the floor slab C is lifted and separated from the adjacent floor slabs C ′ and C ″. When the removal of the floor slab C is completed, the threaded steel bar 21 is removed from the floor slab C, and then the floor slab C is attached to, for example, a bridge. The floor slab demolition device 10 is also moved to the position of the floor slab to be removed next by the casters 26. The floor slab temporarily disassembled is removed from all the floor slab blocks. After completing, remove from the site.

When removing the floor slab, for example, in the case shown in FIG. 2, the floors are simultaneously lifted by pulling up all the threaded steel rods 21 respectively attached to the two floor slab dismantling devices. Separate the slab C from other adjacent slabs C ', C "at once, or use two devices
It is also possible to pull up the threaded steel bar 21 on only one side of 10 or to use one of the two threaded steel bars 21 of each of the two devices 10 (for example, both devices in the example of FIG. 2). May be pulled up and separated from one side.

As described above, according to the floor slab dismantling method of the present invention, a simple and efficient dismantling operation can be performed with a relatively small number of people and at low cost without requiring a large-scale and heavy apparatus. it can. In particular, by using an electric wrench for lifting the floor slab, it is also possible to reduce the cost required for manufacturing and working the floor slab demolition apparatus.

The present invention is not limited to the above embodiment. For example, as the beam member of the floor slab demolition apparatus, as described above, in addition to the channel steel, an H-beam or an I-beam can be used, and a through-hole for penetrating a threaded steel rod in the web of the shape steel is provided. In this case, the beam member can be formed of one mold steel.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a floor slab demolition operation using a method according to the present invention.

FIG. 2 is a plan view showing a floor slab demolition operation using the method according to the present invention.

FIG. 3 is a front view showing a floor slab demolition operation using the method according to the present invention.

FIG. 4 is a diagram showing a beam member of the floor slab demolition device.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a view showing an appearance of an electric wrench used in the floor slab dismantling method according to the present invention.

[Explanation of symbols]

 10 Floor slab dismantling device 11 Beam members 12 Bases 13, 14, 15 Connecting plates 16, 17 Substantially trapezoidal reinforcing ribs 18, 19 Substantially rectangular reinforcing ribs 20 Through holes 21 Threaded steel rods 22, 23 Anchor plates 24 Nuts 25 Electric wrench 26 Caster 27 Clamp 28 Electric wrench body 29 Socket 30 Chuck 31 Wrench hole

Claims (6)

[Claims] 1. A floor slab is cut into a plurality of blocks, a beam member is bridged between blocks on both sides adjacent to a block to be removed, a through hole is provided in the block to be removed, and a hanging bar having a thread is provided. The suspension rod is formed by vertically penetrating the through-hole and the beam member provided in the block to be removed, and screwing nuts from the lower surface of the block to be removed and the upper surface of the beam member to the suspension rod. The floor is fixed between the block and the beam member, and then lifted by removing the block to be removed by rotating the nut in a direction in which the nut is fastened by nut rotating means to raise the hanging bar. Plate dismantling method. 2. The method according to claim 1, wherein the nut rotating means has a length corresponding to a lifting length of the hanging bar, which is necessary to separate the block to be removed from the adjacent block. A floor slab demolition method, wherein a socket for engaging with the nut is provided. 3. The floor slab demolition method according to claim 1, wherein an electric wrench is used for the nut rotating means. 4. An apparatus for dismantling a floor slab cut into a plurality of blocks, comprising: a beam member to be bridged between blocks on both sides adjacent to a block to be removed; and a penetration provided in the beam member and the block to be removed. A threaded suspension rod penetrating the hole, a nut for fixing the suspension rod between the beam member and the removing block, and a nut rotation device for rotating the nut, the nut rotation being provided. A floor slab dismantling device, wherein the removing block is lifted by rotating the nut in a direction in which the nut is fastened by the device to raise the hanging bar. 5. The apparatus according to claim 3, wherein the nut rotating device has a length corresponding to a lifting length of the hanging bar, which is necessary for separating the block to be removed from the adjacent block. And a socket for engaging with the nut. 6. The floor slab demolition method according to claim 4, wherein the nut rotating device is an electric wrench.