JPH086471B2 - Method for preventing water leakage / scattering of cooling / lubricating water when cutting concrete structural members - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing leakage and scattering of water used for cooling and lubrication when cutting a concrete structural member with a concrete cutter, a core cutter or the like.

[0002]

2. Description of the Related Art It is common to cut concrete structural members such as floor slabs of bridge structures and wall inspections using concrete cutters or core cutters. At this time, since water is used for cooling and lubricating the blade of the cutter, if the blade edge of the cutter cuts and penetrates to the back surface of the concrete structural member, the water leaks and scatters.

Although there are cases in which a sheet or the like is laid to deal with the water leakage and scattering, the situation is practically close to a runoff.

[0004]

SUMMARY OF THE INVENTION In view of the above points, the present invention is to solve the problems of water leakage / scattering of cooling / lubricating water when cutting a concrete structural member by a new method.

In the present invention, the above object is to attach a closed-cell synthetic resin foam material to the cut back surface of a concrete structure member to be cut, and to put the concrete structure member and the synthetic resin foam material into the synthetic resin foam material. It can be solved by cutting with an uncut portion left.

[0006]

[Function] Even if the blade edge of the cutter cuts the concrete structural member and protrudes from the cutting back surface, the uncut portion remains in the closed-cell synthetic resin foam material attached to the cutting back surface. Therefore, the uncut portion prevents the cooling / lubricating water from leaking / scattering.

Next, an embodiment of the present invention will be described with reference to the drawings, taking removal of a bridge deck slab as an example. Bridge deck slabs will be removed in the following order. First, as shown in FIGS. 1 and 2, the cutting position is displayed on the surface of the floor slab 1 by the markings 3 and 4, and the position of the hole for the hanging bolt is displayed by the marking 5. In this figure, the marking 3 indicates the cutting position in the transverse direction of the bridge axis, and the marking 4
Indicates the cutting position in the bridge axis direction. The cutting position in the bridge axis direction is
Both sides of the main girder 2 in the bridge axis direction. Reference numeral 7 is a hanging bolt attached to lift the cut block.

Then, as shown in FIG. 3, a plate-shaped closed-cell synthetic resin foam material 6 (hereinafter simply referred to as foam material 6) is used on the cut back surface of the floor slab 1 with an adhesive or an adhesive tape. Install. As the foam material 6, styrene foam, polyethylene foam, urethane foam, or the like is used. The thickness of the foam material 6 is set to a thickness that leaves an uncut portion that the cutting edge does not reach even if the cutting edge 11 of the cutter projects on the cutting back surface. When the thickness of the foam material is insufficient, the blade edge position of the cutter is adjusted so that the blade edge 11 does not cut through the foam material.

When the floor slab is thus ready for cutting, the cutting operation is started using the concrete cutter and the core cutter. First, the bridge axis crossing direction is cut according to the marking 3, and a hole for a hanging bolt is opened in the marking 5, and then a wire is attached to the hanging bolt 7 which is attached in advance on the side of the wall table 1a and suspended in the air by a crane. According to the marking 4a on the outer side of the main girder 2 closest to, the bridge axial direction is cut. The block formed by cutting is lifted by a crane and removed. When cutting, apply cooling / lubrication water to the cut area as appropriate. Then, the other axial direction of the bridge is cut according to the marking 4 and removed in block units. A crane is used for removal by passing a wire through the hole for the hanging bolt that was prepared in advance. Since the foam material is a low-strength material and is easily broken, the block can be removed without removing it.

On the flange of the main girder 2, the concrete block 1b which is not removed remains as shown in FIG.
As shown in FIG. 5, a scaffold 9 is erected by using a cross girder 8 or the like that attaches the foam material 6 to the cutting back surface of the concrete block 1b and connects the main girder 2, and a horizontal cutting cutter is provided on the scaffold 9. The device 10 is placed and horizontal cutting is performed by the cutter blade 10a. Here, when the thickness of the foam material 6 is not sufficient, care must be taken so that the cutter blade 10a does not cut through the foam material 6. The same applies when a hole for a hanging bolt is made with a core cutter.

Although the present invention is utilized in this way,
Needless to say, it is widely used in addition to this embodiment.

[0012]

As described above, the present invention has the following effects. 1 A synthetic resin foam material with closed cells is attached to the cut back surface of the concrete structural member, and the concrete member and the synthetic resin foam material are cut while leaving an uncut portion in the synthetic resin foam material. Prevents water leakage / scattering of cooling / lubricating water. 2. Since the closed-cell synthetic resin foam material is a low-strength material, it does not hinder the cutting efficiency of concrete or the removal of cut concrete blocks.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a state in which a cutting position of a concrete structural member to be cut is marked.

FIG. 2 is a plan view of the same.

FIG. 3 is a schematic cross-sectional view showing an embodiment in which a closed-cell synthetic resin foam material is attached to the cut back surface of a concrete structural member to be cut.

FIG. 4 is a schematic cross-sectional view showing a state of residual concrete on the main girder after removing the cut concrete block.

FIG. 5 is a schematic cross-sectional view showing a cutting situation of residual concrete.

[Explanation of symbols]

 1 Floor slab 2 Main girder 3 Marking of cutting position across bridge axis 4 Marking of cutting position along bridge axis 5 Marking hole for hanging bolt 6 Synthetic resin foam with closed cells

Claims (1)

[Claims] 1. A closed-cell synthetic resin foam material is attached to the cut back surface of a concrete structural member to be cut, and the concrete structural member and the synthetic resin foam material are left uncut in the synthetic resin foam material. Leakage of cooling / lubricating water when cutting concrete structural members characterized by cutting
Shatterproof method.