JP2000313010A - Method for forming opening in concrete body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To economically form an opening by cutting and forming right and left side face cutting lines of an opening forming scheduled position by a wire saw, forming lateral and longitudinal core boring holes there, inserting and comminuting a cylinder head of a hydraulic comminutor in the hole, and dividing a concrete body. SOLUTION: Right and left longitudinal sectional surfaces of an opening 12 forming scheduled position are cut by a wire saw, and side face cutting lines 16 for partitioning both the side faces of the opening 12 are formed. Then, core boring holes 20 made of first to eighth lateral core boring holes 20H1 to 20H8 and first to tenth core boring holes 20V1 to 20V10 are formed. Cylinder heads of a hydraulic comminutor are respectively installed in the holes 20H1, 20H2, and operated to form a first crossing cutting line H1. Then, the head is installed in the hole 20V1 to form a first longitudinal cutting line V1. A block is then divided and removed. Similarly, the above operations are executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an opening in a reinforcing bar or a plain concrete body.

[0002]

2. Description of the Related Art As a method of forming an opening for a fishway or the like in a concrete wall such as a dam embankment, there is, for example, an opening method disclosed in Japanese Patent Application Laid-Open No. 7-173820.

The opening method proposed in this publication is a method of forming an opening in a reinforced concrete dam embankment having a thickness of 1 m or more.
By drilling a cable through hole in the thickness direction by a core drill at each corner of the opening forming area, winding a wire saw between adjacent cable through holes, circulating the wire saw under a predetermined tension state, This is a method of cutting and removing a columnar body for forming an opening from a bank body, and then crushing and removing the columnar body.

According to the opening method proposed in this publication, an opening having a required size can be accurately formed without causing undesired destruction to the surroundings. However, such a conventional opening method has a problem described below.

[0005]

That is, in the opening method proposed in the above-mentioned open method, four rounds of a columnar body for forming an opening are cut by a wire saw.
The wire saw is a wire cable in which a large number of diamond beads are loosely fitted at predetermined intervals on a wire cable, and the diamond beads are cut by frictionally running the diamond beads on concrete.

[0006] When concrete is cut by the friction of such diamond beads, the cut surface becomes smooth, but the diamond beads are worn out with cutting and become unusable, and the wire saw using diamond beads is expensive. Therefore, there was a problem that the construction cost was extremely high.

In the opening method disclosed in the above publication, it is also proposed that the columnar body cut and separated by the wire saw is crushed and removed by using the wire saw to cut the columnar body into blocks. However, when such a method is adopted, high cost construction is required to remove the columnar portion to be disposed of, and there is a problem that the economy of the construction is further deteriorated.

Further, in cutting with a wire saw, it is necessary to inject water to reduce the wear of the diamond beads. However, when water is injected, muddy water containing the cut concrete powder is scattered and the working environment deteriorates. At the same time, post-processing such as cleaning is required, which is more economically disadvantageous.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a method capable of forming an opening economically.

[0010]

In order to achieve the above object, the present invention relates to a method for forming an opening in a concrete body such as a dam embankment, comprising the steps of: Cutting by a wire saw to form a side cut line separating both side surfaces of the opening; and in the opening formation scheduled portion divided by the side cut line, in a substantially horizontal direction of the concrete body. Forming a horizontal core boring hole to be extended; and forming a vertical core boring hole extending in a substantially vertical direction of the concrete body in the opening forming portion defined by the side surface cutting line. And inserting and installing a cylinder head of a hydraulic crusher in the horizontal and vertical core boring holes. Crushing the perimeter, forming horizontal and vertical cutting lines in the openings to be formed divided by the side surface cutting lines, and dividing the concrete body in the openings to be formed into blocks. And sequentially removing the divided blocks. According to the method of forming an opening in a concrete body configured in this way, since cutting with a wire saw is performed only on the left and right vertical cross sections of the place where the opening is to be formed, the construction cost does not become so high, and the working environment deteriorates due to water injection. Can be very low. The horizontal and vertical cutting lines may form the horizontal cutting lines before forming the vertical cutting lines. The horizontal cutting line is installed by inserting the cylinder heads of the hydraulic crusher into the plurality of horizontal core boring holes formed in a row at predetermined intervals in the horizontal direction, and simultaneously expanding the cylinder heads. By actuating, it can be formed so as to connect the left and right side cutting lines. The opening is at a lower end between side cutting lines separating the both side surfaces,
The bottom cutting line connecting both ends can be formed by the earsaw. Further, the present invention provides a method of forming an opening in a concrete body such as a dam embankment, wherein a left and right vertical section and a bottom section of a place where the opening is to be formed are cut by a wire saw, and both sides of the opening are Forming side and bottom cutting lines separating the bottom surface and the bottom surface; and a vertically extending substantially vertical direction of the concrete body in the opening forming portion defined by the side and bottom cutting lines. Forming a core boring hole, inserting and installing a cylinder head of a hydraulic crusher in the vertical core boring hole, and expanding the cylinder head to crush the periphery of the vertical core boring hole and cut the side surface. Forming a vertical cutting line connected to a line and a bottom cutting line, and dividing the concrete body into blocks in the opening forming planned portion, and the divided block Characterized in that it comprises a step of sequentially removed. This method is suitably employed when the depth of the opening is relatively shallow.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 8 show a first embodiment of a method for forming an opening in a concrete body according to the present invention.

The method of forming an opening shown in FIG. 1 is a method of forming an opening 12 for a fishway as a concrete body in an almost damped existing dam embankment 10 in which a reinforcing bar is buried only at the connection between the blocks. Is applied to the case where is formed.

As shown in FIG. 3, the dam embankment body 10 shown in FIG. 3 has inclined side surfaces so as to gradually increase in width from the upper end to the lower end, and has a substantially vertical cross section. It is trapezoidal.

With respect to the dam embankment body 10 having such a shape,
The opening 12 is formed in a substantially concave shape so that the upper end thereof is opened so as to coincide with the upper end of the dam embankment body 10 and both side surfaces and the bottom surface are located inside the dam embankment body 10. The opening 1 of the present embodiment
The two side surfaces are formed so that the width is slightly reduced from above to below.

When forming such an opening 12,
First, as shown in FIG. 1, the left and right vertical cross sections of the place where the opening 12 is to be formed are cut with a wire saw,
Are formed at the side cutting lines 16 separating the both side surfaces of the substrate.

When the side cut line 16 is formed, the dam embankment 1 is provided on both sides of the lower end of the place where the opening 12 is to be formed.
A small-diameter boring hole 18 that penetrates the hole 0 in a substantially horizontal direction is formed. The small-diameter boring hole 18 may have a diameter through which a wire saw (not shown) can be inserted, for example, a diameter of about several tens mm.

When the small-diameter boring hole 18 is formed, a wire saw is inserted into the small-diameter boring hole 18 and wound along a longitudinal section, and the wound wire saw is circulated and run under a predetermined tension. The dam embankment body 10 is cut from the upper side to the lower side so as to be slightly narrower to form a pair of side cutting lines 16 facing each other.

Each side cutting line 1 thus formed
6 is maintained at an interval corresponding to the diameter of the wire saw. The running direction of the wire saw is changed by a guide pulley installed at an appropriate location, guided to the drive device side, and cut while pouring water.

When a pair of side cut lines 16 are formed on both sides of the place where the opening 12 is to be formed by the wire saw, the cut end surface of the dam embankment 10 along the side cut line 16 becomes a smooth surface. It is used as it is as a side surface of the opening 12 without any finishing.

When such a side cut line 16 is formed, a core boring hole 20 penetrating the dam embankment body 10 is formed in a place where the opening 12 defined by the side cut line 16 is to be formed. Is performed.

The core boring hole 20 is for inserting a thin lid head 24 of a hydraulic crusher 22 to be described later, and has a diameter of, for example, 200 mmφ, and is formed by a known core boring machine. You.

The core boring hole 20 is selected according to the size of the hydraulic crusher to be used, and has a small diameter of 30 to 50 mmφ and a medium diameter of about 100 mmφ. Also, it is appropriately selected according to the capacity of the hydraulic crusher to be used and the state of the concrete body to be crushed (reinforcing bar amount, unreinforced bar, etc.).

In the case of this embodiment, the core boring hole 2
0 denotes a plurality of first to eighth horizontal core boring holes 20 _H1 to 2
0 _H8 and a plurality of first to tenth vertical core boring holes 20 _V1
~ 20 _V10 .

A plurality of first to eighth horizontal core boring holes 20
_{H1 to H8} are openings 12 defined by side cutting lines 16.
Is formed so as to penetrate the dam embankment body 10 in a substantially horizontal direction.

In the case of this embodiment, two horizontal core boring holes 20 _{H1 to} 20 _H8 are on the same horizontal line, and each horizontal core boring hole 20 _{H1 to} 20 _H8 and both side cutting lines 16 are provided.
During, and each predetermined interval between the lateral core borehole 20 _H1 to 20 _H8 horizontally adjacent are provided with.

A plurality of first to tenth vertical core boring holes 2
0 _{V1 to} 20 _V10 are located in a portion where the opening 12 is to be formed, which is defined by the side cut line 16, and extend substantially in the vertical direction of the dam embankment 10.

Each vertical core boring hole 20 _V1 -20
_V10 is disposed on the central axis in the width direction of the opening 12 to be formed, and the first vertical core boring hole 20 _V1 is located at the center of the upper end of the dam embankment 10 at the location where the opening 12 is to be formed. I have.

A plurality of first to eighth horizontal core boring holes 20
_H1 to 20 _H8 is, it can be also formed before forming the longitudinal cutting glands 16, can also be formed in accordance with the progress of the removal of blocks to be described later.

A plurality of first to tenth vertical core boring holes 2
0 _{V1 to} 20 _V10 is the opening 12
Only the first vertical core boring hole 20 _V1 located at the upper end of the formation planned portion can be formed, and the other vertical core boring holes 20 _{V2 to} 20 _V10 are sequentially formed in accordance with the progress of block removal described later. I do.

In the case of this embodiment, the dam embankment 10 at the place where the opening 12 is to be formed can be crushed and removed. I do not think.

Therefore, the horizontal core boring holes 20 _{H1 to} 20 _H
H8 and the vertical core boring holes 20 _{V1 to} 20 _V10 do not need to be formed accurately in the horizontal or vertical direction, and do not need to be accurately positioned at the set positions. As long as a cutting line can be formed, there is no problem even in the inclined state.

First and second horizontal core boring holes 20 _H1 , 20
_At the stage when _H2 and the first vertical core boring hole 20 _V1 have been drilled, the dam embankment 10 in the place where the opening 12 is to be formed is formed.
Is divided into blocks.

In the case of the present embodiment, the dam embankment body 10 in the portion where the opening 12 is to be formed is divided into 14 blocks, and the blocks are removed in order from the upper end block in the order of numbering.

The dam embankment 1 in the place where the opening 12 is to be formed
When dividing 0 into 14 blocks, the cylinder head 24 of the hydraulic crusher 22 is inserted into each of the core boring holes 20, and the periphery thereof is crushed to form a cutting line A.

FIGS. 4 and 5 show core boring holes 2.
The details of the cylinder head 24 installed in the cylinder 0 are shown. The cylinder head 24 shown in these figures includes a cylinder body 24a to which a hydraulic hose 30 connected to a hydraulic unit (not shown) is connected, an expansion plate 24b composed of a curved curved plate, and a telescopic piston 2
4c.

As shown in FIG. 4, the state of insertion and installation of the cylinder head 24 is centered on the extension of the anticipated cutting line A ′ due to breakage formed around the core boring hole 20.
The cylinder body 2 is provided on one inner surface side of the core boring hole 20.
4a is arranged so that the curved expansion plate 24b is positioned on the other inner surface side.

[0037] Curved expansion plate 24b
Has an outer surface abutting against an inner surface of the core boring hole 20 and one end of an extendable piston 24c facing the inner surface thereof.
a.

When high-pressure oil is sent from the hydraulic unit to the thus configured cylinder head 24 through the hydraulic hose 30, the telescopic piston 24 c extends, and the curved expansion plate 24 b is strongly pressed against the inner surface of the core boring hole 20. By performing such an enlarging operation, as shown in FIG. 5, the periphery of the core boring hole 20 is broken, and a cutting line A is formed.

The hydraulic crusher 22 used in this embodiment can be applied to both reinforced concrete and unreinforced concrete. In the case of reinforced concrete, the reinforcing bar can also be broken, but if the reinforcing bar cannot be broken because it is stretched, a crack is formed by the crusher 22 to widen the gap to cut or cut the expanded reinforcing bar.

In the case of no reinforcement, there is no obstacle such as a reinforcing bar, so that a cut plane almost as planned can be formed, and the depth of the installation hole is smaller than in the case of reinforced concrete.

In the static crushing method in which the concrete body is crushed by a chemical expansion reaction, the expansion extends over the entire circumference, so that the expansion occurs in an unnecessary direction. In some cases, the interval existing at the side cutting line 16 may disappear.

That is, when the expansion is directed to the side by the static crushing method, the interval of about several tens mm formed by the wire saw existing at the portion of the side cutting line 16 disappears, and it becomes difficult to remove the block when it is blocked. Therefore, even if such an inconvenient expansion is found, the crushing cannot be stopped halfway.

However, the hydraulic crusher 2 according to this embodiment
By adopting 2, it is possible to reliably avoid such inconvenience.

That is, the hydraulic crusher 2 used in this embodiment
In 2, the direction in which the cutting line A is formed can be controlled by adjusting the installation position of the expansion plate 24b, as described above. Formation can be stopped halfway and there is no problem as in the static crushing method.

Here, in the case of the present embodiment, first, the two horizontal core boring holes 20 _H1 and 20 _H2 located on the upper stage side.
The cylinder head 24 of the hydraulic crusher 22 is installed in each of them, and by operating them simultaneously, the first horizontal cutting line H1 is formed.

The first horizontal cutting line H1 is, as shown in FIG.
It is on a line connecting the centers of the first and second horizontal core boring holes 20 _H1 , 20 _H2 , and both ends are side cutting lines 16 respectively.
Is formed.

Next, the cylinder head 24 of the hydraulic crusher 22 is installed in the first vertical core boring hole 20 _V1 ,
By operating this, the first vertical cutting line V1 is formed.

The first vertical cutting line V1 is, as shown in FIG.
The first vertical core boring hole 20 _{V1 is formed on} the central axis so that both ends reach the side surface cutting lines 16.

In this case, the formation depth of the first vertical core boring hole 20 _V1 is set so that the lower end thereof reaches the first horizontal cutting line H1. The order of forming the first horizontal cutting line H1 and the first vertical cutting line V1 is not necessarily performed in the order described above. However, if the horizontal cutting line H is provided before the vertical cutting line V is formed, the horizontal The cutting line H allows the upper and lower edges to be cut off, so that the subsequent formation of the vertical cutting line V becomes easier.

When the first horizontal cutting line H1 is formed, and the block is divided from the block below it,
When the vertical cutting line V1 is formed, the blocks are divided into blocks.

When the division is completed, the blocks are suspended by a crane or the like and removed. When the block and the removal of the block are finished,
As shown in FIG. 7, the second and third vertical core boring holes 20 _V2 and 20 _V3 are formed.

Next, the cylinder heads 24 of the hydraulic crusher 22 are installed in the third and fourth horizontal core boring holes 20 _H3 , 20 _{H 4} , respectively, and these are simultaneously operated, so that the second horizontal cutting line H 2 To form

The timing of forming the second horizontal cutting line H2
Is the vertical core boring hole 20_V2, 20 _V3Before the formation of
May be performed simultaneously with the formation. Also,
When forming the second horizontal cutting line H2, the third and fourth
Horizontal core boring hole 20_H3, 20_H4Length of the first and
And second horizontal core boring hole 20_H1, 20_H2Longer than
The cylinder head 24 of the hydraulic crusher 22
With the third and fourth horizontal core boring holes 20._H3, 20_H4
Of the four cylinder heads 24
It may be activated at times.

That is, a plurality of cylinder heads 24 of the hydraulic crusher 22 used in this embodiment are installed in series at a predetermined interval corresponding to the length of the core boring hole 20 and these are installed. It is possible to operate simultaneously.

As shown in FIG. 6, the second horizontal cutting line H2 is
It is on a line connecting the centers of the third and fourth horizontal core boring holes 20 _H3 , 20 _H4 , and both ends are side cutting lines 16 respectively.
Is formed.

Next, the cylinder heads 24 of the hydraulic crusher 22 are installed in the second and third vertical core boring holes 20 _V2 , 20 _{V 3} , respectively, and these are individually operated, whereby the second vertical cutting is performed. A line V2 and a third vertical cutting line V3 are formed.

The second and third vertical cutting lines V2 and V3 are, as shown in FIG.
0 _V2 , 20 _{V3 on} the center axis, both ends are side cut lines 1
6 are formed.

When the second horizontal cutting line H2 is formed, the block is divided from the block below it, and when the second and third vertical cutting lines V2, V3 are formed, the block is divided individually.

When such division is completed, the block is suspended by a crane or the like and removed. After that,
By repeating similar steps, desired openings 12 are formed.

Now, according to the method of forming the opening 12 configured as described above, the cutting by the wire saw can be performed on the opening 1.
Since only the left and right vertical cross sections of the portion to be formed 2 are used, the construction cost is not so high, and the deterioration of the working environment due to water injection can be extremely reduced.

In the case of this embodiment, the bottom of the formed opening 12 has a recess of the horizontal core boring hole, but this portion is finished by mortar filling or the like. You only have to shape it.

FIG. 9 shows a second embodiment of the method for forming an opening in a concrete body according to the present invention. The same or corresponding parts as those in the above embodiment are denoted by the same reference numerals and the description thereof will be omitted. A description thereof will be omitted, and only the characteristic points will be described below.

In the second embodiment shown in FIG.
The point of a side cut line 16 which隔成the left and right sides of forming a wire saw, is similar to the above embodiment, the lateral core borehole 20a _H1 through 20a _H6 from one side surface of the dam 10 It is formed in a non-penetrating state that does not reach the other side surface.

Each of the vertical core boring holes 20a _V1 to 2
0a _V10 is the horizontal cutting line H1a to H
It is formed in a non-penetrating state that does not reach 3a. In this case, the non-penetration length is appropriately set according to the capacity of the hydraulic crusher 22 to be used.

The non-penetrating horizontal core boring holes 20a _{H1 to} 20a _H6 and the vertical core boring holes 20a _V1 to 20a _H1.
Even if it is 20a _V10 , when the vertical and horizontal cutting lines V1a to V6a and H1a to H3a are formed by the hydraulic crusher 22,
These two ends reach the side surface cutting line 16, and the dam embankment body 10 at the place where the opening 12 is to be formed can be blocked as in the above embodiment.

In this embodiment, in addition to the functions and effects of the above embodiment, the horizontal core boring holes 20a _{H1 to} 20a
_{Since H6} is formed only from one side of the dam embankment 10 and is in a non-penetrating state, if there is an obstacle such as water or earth and sand on one side (non-penetrating side) of the dam embankment 10, the injury Construction can be performed until removal or removal of.

FIG. 10 shows a third embodiment of the method for forming an opening in a concrete body according to the present invention. The same or corresponding parts as those in the above embodiment are denoted by the same reference numerals and the description thereof will be omitted. A description thereof will be omitted, and only the characteristic points will be described below.

In the third embodiment shown in the figure, the horizontal core boring holes 20b _{H1 to} 20b _H4 are formed substantially in the horizontal direction from both sides of the dam embankment body 10 and are not formed at the center of the dam embankment body 10. It is in a penetrating state. Even with such a horizontal core borehole 20b _H1 ~20b _H4, the first embodiment and the same effect can be obtained.

FIG. 11 shows a fourth embodiment of the method for forming an opening in a concrete body according to the present invention. The same or corresponding parts as those in the above embodiment are denoted by the same reference numerals and the description thereof will be omitted. A description thereof will be omitted, and only the characteristic points will be described below.

In the embodiment shown in the figure, a side cutting line 16 that separates the left and right side surfaces of the opening 12 is formed by a wire saw, and a bottom cutting line 19 that defines the bottom surface of the opening 12 is formed by a side saw. It is formed so as to be connected to the lower end of the cutting line 16.

Further, the side cutting line 19 corresponds to the dam embankment body 10.
Slope at a given angle from one side to the other
It is formed in the state where it was set. In addition, horizontal core boring hole 2
0c _H1~ 20c_H4From one side of the dam embankment 10
Specified with respect to the horizontal so that it is almost perpendicular to this side
It is formed so as to be inclined downward at an angle of.

The horizontal core boring holes 20c _H1 to 2
0c _H4 is formed in a non-penetrating state that does not reach the other side surface of the dam embankment body 10. Further, the first vertical core boring hole 20c _V1 is formed in a non-penetrating state which is oriented substantially in the vertical direction and does not reach the first horizontal cutting line H1c.

The second and subsequent vertical core boring holes 20
c _{V2 to} 20c _V10 are substantially perpendicular to the horizontal cutting line H2c and the bottom cutting line 19 below, and
It is formed in a non-penetrating state.

The horizontal core boring hole 2 thus formed
In 0c _H1 ~20c _H4, each lateral cutting line H1c~H2
When forming c, since the weakest part is broken in the non-penetrating part, as shown in FIG.
A cutting line D inclined upward is formed at the tip of 2c, and the block shape is slightly different, but there is no problem in the division and removal.

In the case of the present embodiment, the horizontal core boring holes 20c _{H1 to} 20c _H4 are formed from one side of the dam embankment 10 so as to be substantially perpendicular to this side. It is easier to form than when a substantially horizontal boring hole is perforated on the side surface of the hole.

FIGS. 12 to 14 show a fifth embodiment of the method for forming an opening in a concrete body according to the present invention. The same or corresponding parts as those in the above embodiment are designated by the same reference numerals. A description thereof will be omitted, and only the characteristic points will be described below.

In the embodiment shown in these figures, the opening 12
Is applied when the width of the opening 12 is relatively large. When the opening 12 is formed, three side cutting lines 16a to 16c separating the side surfaces of the opening 12 are formed by a wire saw. .

The small diameter boring hole 18 provided when forming the side surface cutting lines 16a to 16c is inserted through the wire saw when forming the bottom surface cutting line 19 separating the bottom surface of the opening 12 with the wire saw. You.

The horizontal core boring holes 20d _{H1 to} 20d _H2 provided in the portions where the openings 12 are to be formed are formed in the dam embankment 1
0, and is formed to extend substantially in the horizontal direction.

Vertical core boring holes 20d _{V1 to} 20d _V10
Are formed in a non-penetrating state so as not to reach the horizontal cutting lines H1d to H2d so as to be oriented substantially in the vertical direction of the dam embankment body 10.

In the case of the present embodiment, the hydraulic crusher 22 is inserted into the first horizontal core boring hole 20d _H1 and the first vertical core boring hole 20d _V1 to perform the enlarging operation, as shown in FIG. Since the d block is separated, it can be removed as shown in FIG.

Subsequently, when the hydraulic crusher 22 is inserted and installed in the first horizontal core boring hole 20d _H1 and the second vertical core boring hole 20d _V2 to perform the expanding operation, the d block is separated. . Thereafter, by returning the same operation, the block can be divided and removed one by one. In the course of such blocking, the lateral core borehole 20d _H1 ~20d a diameter of _H2 200 meters
mφ, the diameter of the motor part of the drilling machine used for this formation is smaller than 200 mmφ.
The 0d _H1 ~20d _H2, may be provided to a position which has passed through immediately below the vertical core boring hole located in front, it can be extended to at forward from its position after removal of the block.

In this embodiment, the side sectional line 1
The portions surrounded by 6a and 16b and the portions surrounded by the side sectional lines 16b and 16c have substantially the same vertical and horizontal configurations as shown by adding 'to one symbol. Since the core boring holes are provided, the blocks with the suffix 'can be divided and removed one by one in the same manner as the above procedure.

FIGS. 15 and 16 show a sixth embodiment of the method for forming an opening in a concrete body according to the present invention.
The same reference numerals are given and the description is omitted, and only the characteristic points will be described below.

The method shown in this embodiment is preferably applied when the depth of the opening 12 to be formed is relatively shallow. The surface and the bottom cross section are cut by a wire saw to form side and bottom cut lines 16 and 19 separating the side surfaces and the bottom surface of the opening 12.

Then, the side and bottom cutting lines 16, 19
The vertical core boring holes 20d _v1 and 20d extending in a substantially vertical direction in the portions where the openings 12 are to be formed.
Form _v2 .

Next, the vertical core boring holes 20d _v1,2
The cylinder head 24 of the hydraulic crusher 22 inserted is placed into 0d in _v2, the expansion operation of the cylinder head 24, by crushing the periphery of the vertical core borehole 20d _v1, 20d _v2, side cut line 16 and bottom cut line 19 Is formed, the dam embankment body 10 in the portion where the opening 12 is to be formed is divided into blocks, and the divided blocks are sequentially removed.

In the case of this embodiment, the formation of the opening 12
20d vertical core boring holes at fixed locations _v1, 20d_v2Clown
Although not provided, this vertical core boring hole 20d_v1,
20d_v2Inside, insert the hydraulic crusher 22 and install
When H1e is formed, the opening 12 is formed, and the first hole is formed.
The same operation and effect as the embodiment can be obtained.

In the above embodiment, the dam body 10 is exemplified as the concrete body forming the opening 12.
The embodiment of the present invention is not limited to this, and can be applied to the case where an opening is formed in another form of a reinforcing bar or a plain concrete body.

[0090]

As described above, according to the method for forming an opening in a concrete body according to the present invention,
The opening can be formed economically.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of an initial step showing a first embodiment of a method for forming an opening in a concrete body according to the present invention.

FIG. 2 is a top view of FIG. 2;

FIG. 3 is a sectional view of FIG. 2;

FIG. 4 shows a state before a cylinder head is operated when a cutting line is formed by a cylinder head of a hydraulic crusher by the method of FIG.
It is the top view and side explanatory drawing of an installation state.

5 is a top view and a side view after the cylinder head is operated from the installation state of FIG. 4;

FIG. 6 is an explanatory plan view of a step performed subsequent to FIG. 1;

FIG. 7 is a top view of FIG. 6;

FIG. 8 is a sectional view of FIG. 6;

FIG. 9 is an explanatory sectional view showing a main part of a second embodiment of the method for forming an opening in a concrete body according to the present invention.

FIG. 10 is an explanatory sectional view of a main part showing a third embodiment of the method for forming an opening in a concrete body according to the present invention.

FIG. 11 is an explanatory sectional view of a main part showing a fourth embodiment of the method for forming an opening in a concrete body according to the present invention.

FIG. 12 is an explanatory sectional view of a principal part showing a fifth embodiment of the method for forming an opening in a concrete body according to the present invention.

FIG. 13 is an explanatory front view of FIG. 12;

FIG. 14 is an explanatory diagram of a main part extraction of FIG. 12;

FIG. 15 is an explanatory plan view of a principal part showing a sixth embodiment of the method for forming an opening in a concrete body according to the present invention.

16 is an explanatory sectional view of a main part of FIG.

[Description of Signs] 10 Dam embankment body 12 Opening 16 Side cut line 20 Core boring hole 20 _{H1 to} 20 _H6 1st horizontal core boring hole to 6th horizontal flat core poling hole 20 _{V1 to} 20 _V10 1st vertical core boring hole Tenth vertical core boring hole 22 Hydraulic crusher 24 Cylinder head

Claims (5)

[Claims] 1. A method of forming an opening in a concrete body such as a dam embankment, wherein at least a right and left vertical section of a portion where the opening is to be formed is cut with a wire saw to separate both side surfaces of the opening. Forming a side surface cutting line; forming a horizontal core boring hole extending in a substantially horizontal direction of the concrete body in the opening forming portion defined by the side surface cutting line; Forming a vertical core boring hole extending in a substantially vertical direction of the concrete body in the opening forming portion defined by the cutting line; and a hydraulic crusher in the horizontal and vertical core boring holes. Inserting and installing a cylinder head, crushing the periphery of the horizontal and vertical core boring holes by the enlarging operation of the cylinder head, Forming a horizontal and a vertical cutting line in a portion where the opening is to be formed, and dividing the concrete body in the portion where the opening is to be formed into blocks; and sequentially removing the divided blocks. A method of forming an opening in a concrete body, characterized by comprising: 2. The method for forming an opening in a concrete body according to claim 1, wherein said horizontal and vertical cutting lines form said horizontal cutting lines before forming said vertical cutting lines. 3. The horizontal cutting line is formed by inserting and installing a cylinder head of the hydraulic crusher into a plurality of the horizontal core boring holes formed in a row at predetermined intervals in a horizontal direction. 3. The method for forming an opening in a concrete body according to claim 2, wherein the cylinder head is simultaneously expanded so as to connect the left and right side cutting lines. 4. The earsaw according to claim 1, wherein the opening is formed at the lower end between side cut lines separating the both side surfaces by a bottom cut line connecting both ends by the earsaw. A method for forming an opening in a concrete body according to claim 1. 5. A method of forming an opening in a concrete body such as a dam embankment, wherein a left and right vertical section and a bottom section of a place where the opening is to be formed are cut with a wire saw, and both sides of the opening are formed. Forming a side surface and a bottom surface cutting line separating the bottom surface; and a vertical core extending in a substantially vertical direction of the concrete body within the opening forming portion defined by the side surface and the bottom surface cutting line. Forming a boring hole, inserting and installing a cylinder head of a hydraulic crusher in the vertical core boring hole, and crushing the periphery of the vertical core boring hole by expanding the cylinder head to cut the side cutting line. Forming a vertical cutting line connected to the bottom cutting line, and dividing the concrete body into blocks in the opening-forming portion, and the divided block. Methods of creating openings in the concrete body, characterized in that it comprises a step of sequentially removed.