JP2003214083A - Cutting method for structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting process for a structure allowing smooth advance of a wire saw when cutting off one part of the structure by vertical cutting followed by horizontal cutting by a wire saw. <P>SOLUTION: A boundary part between the structure and a part to be cut off from the structure is vertically cut, and jacks are respectively attached to a plurality of insertion holes vertically bored to a horizontal cutting position of the part to be cut in an upper face side of the part to be cut. By connecting the part to be cut and a horizontal member laid across upper end parts of the jacks and pushing up the horizontal member by the jacks, the part to be cut is also pushed up and the part to be cut is horizontally cut by the wire saw. Horizontal cutting of the part to be cut by the wire saw can be smoothly carried out. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cutting a structure by cutting the structure vertically and horizontally to separate a part of the structure from the structure.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 11-172675 discloses
A technique for excavating a shaft using a wire saw is described. In the technique disclosed in Japanese Patent Laid-Open No. 11-172675, a drill bit is mounted on the tip, and a circular ring having a cutting bit mounted on the tip is concentric inside a casing tube that is pressed into the ground while rotating. Using a horizontal cutting device for underground structures that is attached in a circular shape and temporarily fixed with a wire saw at the tip of this circular ring, while digging with casing tubes for underground structures that are reinforced concrete piles. Press down and excavate the outside of the underground structure into a double cylinder with a casing tube and a circular ring. Then, when the excavation has progressed to a predetermined depth, stop the press-fitting of the casing tube and cut the underground structure horizontally with a wire saw, then pull up the circular ring upwards, and instead use an appropriate pulling tool inside the casing tube. The technique of repeatedly performing the mode in which the cut portion of the underground structure is pulled up and removed is described.

[0003]

The above-mentioned conventional techniques have the following problems. First, Japanese Patent Laid-Open No. 11-1726
When the concrete structure is horizontally cut with a wire saw as in the technique described in Japanese Patent No. 75, a horizontal cutting groove is formed along with the progress of horizontal cutting with the wire saw. As it progresses, the spacing of the cutting grooves becomes narrower due to the load of the structure located above the cutting groove, which makes it difficult to move the wire saw. Second,
In the case of a columnar member or the like, it is possible to assist the progress of the wire saw by inserting a wedge or the like into the cutting groove. However, like the underground structure of the technique described in JP-A No. 11-172675. In addition, when the wall portion extending in the vertical direction is cut in the vertical direction and then the cut end portion is horizontally cut from the wall portion in the horizontal direction by a wire saw, it is difficult to insert a wedge. The present invention is made in view of the above problems, and cuts the structure in the vertical direction, by horizontally cutting with a wire saw,
An object of the present invention is to provide a method of cutting a structure in which a wire saw can smoothly advance when a part of the structure is cut off.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 makes a structure (for example, a vertical shaft 10 or the like) a vertical structure as shown in FIGS. 1 to 3, 5 and 6. A method of cutting a structure (for example, a vertical shaft 10 or the like) by cutting a part of the structure (for example, the vertical shaft 10 or the like) by cutting in the horizontal direction and the horizontal direction, For example, a portion to be cut (for example, the upper step portion 21 or the like) and a structure (for example, the vertical shaft 10 or the like) separated from the vertical shaft 10 or the like)
While cutting the boundary portion P in the vertical direction, the insertion holes 3, ... Are formed at a plurality of positions of the boundary portion P from the upper surface side of the cut portion (for example, the upper step portion 21 etc.). 81, the horizontal cutting position 81a, 21a)
Up to the vertical direction, and then the jacks 4, ... Are respectively loaded into the plurality of insertion holes 3, ..., Then, above the cut portion (for example, the bottom portion 81, the upper step portion 21 and the like). , The horizontal member 5 is arranged so as to be bridged between the upper end portions 41 of the jacks 4, ... And the horizontal member 5 and the cut portion (for example, the bottom portion 81, the upper step portion 21 and the like) are connected, , While pushing the cross member 5 upward by the jacks 4, ..., The portion to be cut (for example, the bottom portion 81, the upper portion 21 and the like) is horizontally cut by the wire saw 6 at the horizontal cutting positions 81a and 21a. I am trying.

According to the first aspect of the present invention, first, by cutting the boundary between the structure and the portion to be cut in the vertical direction, the portion to be cut can be separated from the structure in the vertical direction and the wire can be cut. Saw can be placed. Further, insertion holes are drilled in the vertical direction from the upper surface side of the cut portion to the horizontal cutting position of the cut portion at a plurality of positions of the boundary portion, and then the plurality of insertion holes are respectively loaded with jacks,
Next, a horizontal member is arranged above the cut portion so as to be bridged between the upper ends of the jacks, and the cross member and the cut portion are connected to each other so that the force in the pushing-up direction by the jack is applied. It becomes a state where it can be applied to. Since the section to be cut is connected to the cross member, if the jack pushes the cross member upward, the section to be cut is also pushed upward, and in this state, the wire saw moves horizontally at the horizontal cutting position of the cut member. Although it cuts, the load of the part to be cut is supported by the cross member, so when the horizontal cutting of the part to be cut by the wire saw progresses, the load of the already cut part of the part to be cut The path is not blocked, and the wire saw can be prevented from being pressed by the portion to be cut. As a result, horizontal cutting of the portion to be cut by the wire saw can be smoothly advanced.

The invention of claim 2 is, for example, as shown in FIGS.
As shown in FIGS. 5 and 6, in the method of cutting a structure according to claim 1, the cut portion (for example, the bottom portion 8) is cut from the upper surface side of the cut portion (for example, the bottom portion 81, the upper step portion 21 and the like).
1, a plurality of holes 8 reaching the horizontal cutting positions 81a, 21a of the upper step portion 21 and the like are continuously formed along the boundary portion P to cut a portion to be cut (for example, the bottom portion 81, the upper step portion 21 and the like). ) And a structure (for example, a shaft 10) P
Is characterized by cutting in the vertical direction.

According to the second aspect of the present invention, a plurality of holes extending from the upper surface side of the cut portion to the horizontal cutting position are continuously formed along the boundary portion, whereby the cut portion and the structure are formed. Since the boundary portion is cut in the vertical direction, the boundary portion can be reliably cut even if the planar shape of the boundary portion is an irregular shape such as an arc-shaped curve. Further, since the boundary between the portion to be cut and the structure is cut by continuously drilling a plurality of holes, the work of cutting the boundary and the work of drilling the insertion hole can be performed in parallel. , Work efficiency can be improved.

According to a third aspect of the present invention, for example, as shown in FIG. 3, in the method of cutting a structure according to the first or second aspect, the portion to be cut (for example, the bottom portion 81, the upper portion 21 and the like).
Are fixed to the horizontal members 5 by fixing the chemical anchors 7, ... To the horizontal members 5 and the upper ends 71 of the chemical anchors 7 ,.
Etc.) are connected.

According to the third aspect of the present invention, the chemical anchor has an excellent fixing force, a large pull-out strength, and a uniform and stable fixing force. It can be stably and firmly connected to the cross member. Therefore, as the cross member is pushed up by the jack, the cut portion can be pushed up stably.

The chemical anchor is provided, for example, in a hole formed in the cut portion, and a glass tubular range capsule filled with a resin and a curing accelerator, an aggregate and the like to be inserted into the hole, and It consists of an anchor bolt that is inserted over the tubular range capsule. This chemical anchor, due to the rotation impact when inserting the anchor bolt,
The tubular range capsule is crushed, and the resin, the curing accelerator, the aggregate, the glass tube of the crushed tubular range capsule, and the like are mixed and adhered to the periphery of the hole. It is an adhesive type anchor that cures with the passage of time at a normal temperature decrease and can connect the cross member and the cut portion with a highly reliable and stable fixing force.

The invention according to claim 4 is, for example, as shown in FIGS. 5 and 6, in the method for cutting a structure according to any one of claims 1 to 3, wherein the structure is formed on an inner wall surface 101. It is a vertical shaft 10 having an inner projecting portion (for example, the upper step portion 21 and the like), and the cut portion is an inner projecting portion (for example, the upper step portion 21 and the like).

According to the invention of claim 4, the structure is a vertical shaft having an inner projecting portion formed on the inner wall surface, and the portion to be cut is an inner projecting portion. Therefore, the inner projecting portion and the inner wall of the vertical shaft are formed. It is possible to cut the boundary portion even in a limited space like the boundary portion with and to push up the inner protruding portion to be cut even in a narrow place. Therefore, for example, horizontal cutting of the inner protruding portion can be performed easily and smoothly as compared with the case where a wedge or the like is driven into the cut surface of the wire saw.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A structure cutting method according to the present invention will be described below with reference to the drawings as a first embodiment in which a bottom 81 for excavating a shaft 10 (structure) is cut off. A description will be given based on an example.

In the method of cutting a structure according to the first embodiment, as shown in FIGS. 1 to 3, the boundary portion P between the bottom portion 81 (cutting portion) and the shaft 10 (structure) is vertically oriented. The core boring device 30 that cuts and punches the insertion holes 3, ... From the upper surface side of the bottom portion 81 in a plurality of positions of the boundary portion P in the vertical direction to the horizontal cutting position 81a of the bottom portion 81, and the horizontal member that is connected to the bottom portion 81. 5, the chemical anchor 7 that connects the cross piece 5 and the bottom 81, the jack 4 that pushes up the cross piece 5 upward, and the wire saw 6 that cuts horizontally at the horizontal cutting position 81a of the bottom 81.

The core boring machine is, for example, as shown in FIG. 4, a well-known concrete core boring machine 3 having a boring tube 33 which is a cylindrical boring member having a drill bit 32 attached to the tip of a rod tube 31.
0 is used. The boring tube 33 is rotated by driving a motor (not shown) provided in the concrete core boring device 30, and the boring tube 32 attached to the tip of the rod tube 31 causes the upper surface near the boundary P of the bottom 81 to reach a predetermined depth. It is to make a hole.

The cross member 5 is made of H-shaped steel consisting of upper and lower flanges 51, 51 and a web 52 provided between the flanges 51, 51.

The chemical anchor 7 is provided in a hole (not shown) formed in the bottom portion 81, and is a glass tubular range capsule (not shown) filled with a resin, a curing accelerator, an aggregate and the like. ) And an anchor bolt (not shown) inserted from above the tubular range capsule. The tubular range capsule is crushed by the rotational impact when the anchor bolt is inserted from above the tubular range capsule inserted into the hole, so that the resin, the curing accelerator, the aggregate, and the glass tube of the crushed tubular range capsule, etc. Are mixed and deposited in the holes. Then, at a normal temperature decrease, the bottom portion 81 and the H-section steel 5 can be connected to each other by hardening with the passage of time and a stable and reliable fixing force.

The jack 4 is a hydraulic jack, and one hydraulic jack 4 is loaded in one insertion hole 3 and, in a state of being loaded in the insertion hole 3, from the inside of the insertion hole 3 toward the upper part of the bottom 81. It can be extended.

In the wire saw 6, the wire portion 61 made of diamond wire is pressed against the bottom portion 81 which is an object to be cut, and a pulley (not shown) driven by a motor (not shown) is rotated at a high speed so that the step 2 is formed. It is to cut. The wire portion 61 is arranged in a hole (borehole) S for inserting the wire portion 61.

Next, the method of cutting the structure in the present embodiment will be described using an example in which the bottom portion 81 (cut portion) of the vertical shaft 10 (structure) is cut off from the vertical shaft 10.

First, the boundary P between the bottom 81 and the inner wall 101 of the vertical shaft 10 is cut in the vertical direction. As shown in FIG. 4A, the core boring device 30 is driven by a motor to rotate the small-diameter boring tube 33, and the boundary portion P between the inner wall portion 101 of the vertical shaft 10 and the bottom portion 81 is drilled. Then, after boring to a predetermined depth, as shown in FIG. 4B, the boring tube 33 is pulled out. Further, by continuously performing small-diameter core boring along the boundary portion P between the bottom portion 81 and the inner wall portion 101, the plurality of holes 8 extending from the upper surface side of the step 2 to the horizontal cutting position 81a of the bottom portion 81 are formed.
To drill. Thereby, the boundary portion P between the bottom portion 81 and the inner wall portion 101 of the vertical shaft 10 can be cut in the vertical direction.

Subsequently, the hole 8 is formed at the cut boundary portion P.
In the same manner as the method of boring, the boring tube having a large diameter is used to insert the insertion holes 3, ...
Drill up to a. The insertion hole 3 has a sectional area slightly larger than the area of the hydraulic jack 4.

Next, as shown in FIG. 3, the plurality of insertion holes 3, ... Are loaded with hydraulic jacks 4 ,. At this time, the hydraulic jack 4 required to push up the H-shaped steel 5
Is less than the height of the bottom 81, the adjustment material 44
Is arranged on the mounting surface on the bottom of the insertion hole 3 where the hydraulic jack 4 is arranged, and the heights of the hydraulic jack 4 and the bottom 81 are adjusted.

Next, on the upper surface side of the bottom portion 81, the H-shaped steel 5 is arranged so as to bridge over the upper end portions 41 of the hydraulic jacks 4, ...
The chemical anchors 7, ... Are attached to the bottom 81, and the upper ends 71 of the chemical anchors 7, ... Are fixed to the H-section steel 5 to connect the H-section steel 5 and the bottom 81.

Next, as shown in FIG. 1 and FIG.
The wire saw body 63 is installed in the vicinity of the boundary portion P on the upper surface, and the winding holes 9 and 9 of the wire portion 61 are preliminarily provided in the vertical direction, and the bottoms of the winding holes 9 and 9 (lower portion 82). Pulleys 62a and 62b for guiding the winding direction of the wire portion 61 are attached to the upper surface of the pulley. Then, the wire portion 61 is arranged on the outer peripheral side of the boundary portion P of the bottom portion 81 and is wound around the pulleys 62a and 62b to guide the wire portion 61 from the horizontal cutting position 81a to the wire saw body portion 63. At this time, in the insertion hole 3, the wire portion 61 is arranged so as to pass between the insertion hole 3 and the hydraulic jack 4. Wire saw 6
When the bottom 81 cannot be arranged along the horizontal cutting direction, the wire saw 6 can be used for horizontal cutting as described above. As shown in FIG. 2, the wire saw body 63 may be arranged outside the outer circumference of the vertical shaft 10.

Then, the hydraulic jacks 4, ... Are raised and the H-section steel 5 is pushed upward to prevent the weight of the bottom portion 81 toward the lower portion 82 due to the weight of the bottom portion 81. It advances from one of the outer peripheral sides toward the winding side, and cuts horizontally at the horizontal cutting position 81a of the bottom portion 81.

According to the method of cutting a structure in the present embodiment, the hydraulic jack 4 is loaded in the insertion hole 3 formed on the upper surface side of the bottom portion 81, and the hydraulic jack 4 is bridged between the upper end portions 41 of the hydraulic jack 4. Since the H-shaped steel 5 is arranged and the H-shaped steel 5 and the bottom portion 81 are connected to each other, by raising the hydraulic jack 4, a force in the pushing-up direction acts on the bottom portion 81 during cutting. This can prevent the wire saw 6 from being pressed by the weight of the bottom portion 81. Therefore, as the horizontal cutting by the wire saw 6 progresses, the weight of the already cut bottom portion 81 causes
It is possible to prevent the running path of the wire portion 61 from being blocked and smoothly perform horizontal cutting.

The boundary P between the bottom 81 and the structure is cut vertically by continuously boring the core 81 by core boring, and the boundary P is cut from the upper surface of the bottom 81. By vertically inserting the insertion holes 3, ... In a plurality of positions up to the horizontal cutting position 81a of the bottom portion 81, the bottom portion 81 and the boundary portion P can be separated in the vertical direction. Further, the wire portion 61 of the wire saw 6 can be arranged. At this time, the core boring device 30 is used to form not only the small-diameter holes 8 but also
Since the insertion hole 3 is drilled, the drilling work for cutting the boundary P in the vertical direction and the drilling work of the insertion hole 3 can be performed in parallel, and the work efficiency can be improved. Further, when the bottom portion 81 of the vertical shaft 10 is cut off, the bottom portion 8 that is the portion to be cut
1, even if there is no place to install the wire saw 6 or a place to install a wedge or the like between the horizontal cutting parts,
The bottom 81 of the shaft 10 can be cut off.

Further, the hydraulic jacks 4, ... Are respectively loaded in the plurality of insertion holes 3, .. Then, the H-shaped steel 5 is arranged so as to bridge over the upper end portions 41 of the jacks 4 ,. And arranging the H-section steel 5 and the bottom portion 81 so that a force can be applied in a direction in which the H-section steel 5 coupled to the bottom portion 81 is pushed up by the hydraulic jack 4. You can

Further, since the horizontal member 5 uses the H-shaped steel, it is excellent in bending resistance, and even if a part of the H-shaped steel is pushed up by the hydraulic jack 4, the H-shaped steel is hard to bend and the bottom portion 81 can be more reliably fixed. Can be pushed up.

A boundary portion P between the bottom portion 81 and the side wall portion of the vertical shaft 10.
Since the boundary portion P is cut by forming a plurality of holes by a small-diameter core boring along the line, the work of uniformly forming the plurality of holes 8 and the insertion holes 3 to a desired depth can be easily performed. .

Further, since the bottom portion 81 and the H-section steel 5 are connected by the chemical anchor 7, a firm fixing structure can be constructed by an easy method.
The shaped steel 5 can be connected stably and firmly.

In the present embodiment, the bottom portion 81 is cut to dig down the vertical shaft 10, but the present invention is not limited to this. For example, a portion to be cut having a desired planar shape is cut from a structure. May be

Next, in the second embodiment of the method for cutting a structure according to the present invention, the upper step portion 21 of the step 2 (inner protruding portion) built in the shaft 10 (structure) is cut off. A description will be given based on the applied example. FIG. 5 shows a vertical shaft 10 formed for temporarily storing sewage, and inside the vertical shaft 10, a step 2 (inward protruding portion) that guides a flow path of the sewage flowing from the upper part of the vertical shaft 10. ) Has been formed.

In the method of cutting a structure according to the present embodiment, as shown in FIGS. 3, 5 and 6, the boundary portion between the upper step portion 21 of the step 2 (internal protruding portion) and the shaft 10 (structure). A core boring device 30 which cuts P in the vertical direction, and vertically inserts insertion holes 3, ... From the upper surface side of the step 2 at a plurality of positions of the boundary portion P to the horizontal cutting position 21a of the upper step portion 21, A cross member 5 connected to the upper step portion 21, a chemical anchor 7 connecting the cross member 5 and the upper step portion 21,
A jack 4 that pushes up the cross member 5 upward and a wire saw 6 that horizontally cuts the step 2 at the horizontal cutting position 21 a of the upper step portion 21 are used.

The core boring device 30, the cross member 5, the chemical anchor 7, the jack 4, and the wire saw 6 have the same configurations as those in the first embodiment, and therefore the description thereof will be omitted and the present embodiment will be described. Regarding the method of cutting a structure in the form of Example 1, an example in which an upper step portion 21 (inner protruding portion) that is an upper portion of a step 2 formed so as to project in the horizontal direction is separated from the vertical shaft 10 (structure) It demonstrates using.

First, the boundary portion P between the upper step portion 21 of the step 2 and the side wall of the vertical shaft 10 is cut in the vertical direction. As shown in FIG. 4 (a), the small-diameter boring tube 33 is rotated by the motor drive of the core boring device 30, and the vertical shaft 1
A boundary portion P between the inner wall portion 101 of 0 and the upper step portion 21 is drilled. Then, after boring to a predetermined depth, as shown in FIG. 4B, the boring tube 33 is pulled out. Furthermore, along the boundary portion P between the upper step portion 21 and the inner wall portion 101,
By continuously performing small-diameter core boring, a plurality of holes 8 from the upper surface side of the step 2 to the horizontal cutting position 21a of the upper step portion 21 are formed. Thereby, the boundary portion P between the upper step portion 21 and the inner wall portion 101 of the vertical shaft 10 can be cut in the vertical direction.

Subsequently, the hole 8 is formed at the cut boundary portion P.
In the same manner as the method in which the large-diameter boring tube is used, the insertion holes 3, ... Are vertically provided at a plurality of locations from the upper surface side of the upper step portion 21 of the step 2 in the horizontal cutting position of the upper protruding portion 21. Drill up to 21a. The insertion hole 3 has a sectional area slightly larger than the area of the hydraulic jack 4.

Next, as shown in FIG. 3, the hydraulic jacks 4, ... Are respectively loaded into the plurality of insertion holes 3, ..., And as shown in FIG. Install the hydraulic jacks 4, ... at predetermined intervals. At this time, the hydraulic jack 4 required to push up the H-shaped steel 5
Is lower than the height of the upper step portion 21, the adjusting material 4
4 to the bottom of the insertion hole 3 or the upper surface of the lower step portion 22, etc.
The height of the hydraulic jack 4 and the upper step part 21 is adjusted by arranging the hydraulic jack 4 on the mounting surface.

Next, the upper end portion 41 of the hydraulic jack 4 loaded in the insertion hole above the upper step portion 21 and the hydraulic jacks 4, 4 arranged on the outer peripheral side other than the boundary portion P of the upper step portion 21.
The H-shaped steel 5 is arranged so as to be bridged between them, the chemical anchors 7, ... Are attached to the upper step portion 21, and the upper ends 71 of the chemical anchors 7 ,. The steel 5 and the upper part 21 are connected.

Next, as shown in FIG. 5, the wire saw 6 is installed on the outer peripheral side of the upper step portion 21 other than the boundary portion P at a position facing the upper step portion 21. The wire saw 6 includes a pulley (not shown) for winding the wire portion 61 inside the wire saw body 63. If the position of the pulley that winds up the wire portion 61 is the same position as the horizontal cutting position 21a of the upper step portion 21, the wire portion 61 arranged on the outer periphery of the boundary portion P of the upper step portion 21 is placed in the pulley of the wire saw body 63. However, the winding position of the wire portion 61 and the horizontal cutting position 21a do not necessarily coincide with each other. For example,
As shown in FIG. 5, the winding position of the wire portion 61 is
When located above the horizontal cutting position 21a, in the vicinity of the inner wall of the vertical shaft 10 on the lower step portion 22, the pulley 62 that horizontally rotates so as to be substantially the same height as the horizontal cutting position 21a.
a and 62a are mounted, and a pulley 62 that rotates in the vertical direction is provided near the horizontal pulleys 62a and 62a.
Attaching b and 62b, wire part 6 extending horizontally
1 is guided in the vertical direction. Further, the pulleys 62c and 62c are arranged also on the outer peripheral side surface other than the boundary portion P of the upper step portion 21 to guide the wire portion 61 to the wire saw body portion 63 side. Then, the wire saw body 63 is attached to the pulley 62.
d and 62e are attached, and the wire portion 61 is guided to a pulley (not shown) in the wire saw body portion 63 so as to be wound up.

Then, the wire portion 61 is arranged on the outer peripheral side of the boundary portion P of the upper step portion 21 and is inserted to the horizontal cutting position 21a. At this time, in the insertion hole 3, the wire portion 61 is arranged so as to pass between the insertion hole 3 and the hydraulic jack 4. Then, the hydraulic jacks 4, ... Are raised and the H-shaped steel 5 is pushed upward to suppress the weight of the upper step portion 21 toward the lower step portion 22 due to its own weight, and the wire portion 61 is connected to the boundary of the upper step portion 21. By advancing toward the outer peripheral side other than the portion P, the step 2 is horizontally cut by the wire saw 6 at the horizontal cutting position 21 a of the upper step portion 21.

Then, when the horizontal cutting by the wire portion 61 progresses to the lower side of the wire saw main body portion 63, the installation position of the wire saw 6 is changed and the remaining portion is horizontally leveled in the same manner as the above horizontal cutting method. Make a cut.

According to the method of cutting a structure in the present embodiment, the hydraulic jack 4 is loaded into the insertion hole 3 formed on the upper surface side of the upper step portion 21, and the upper end portion 41 of the hydraulic jack 4 is loaded.
Since the H-section steel 5 is arranged so as to be bridged between them and the H-section steel 5 and the upper step portion 21 are connected to each other, by raising the hydraulic jack 4, the upper step portion 21 in the middle of cutting is cut.
A force in the pushing direction acts on. As a result, it is possible to prevent the wire saw 6 from being pressed by the weight of the upper portion 21. Therefore, it is possible to prevent the running path of the wire saw 6 from being blocked by the dead weight of the upper step portion 21 that has already been cut along with the progress of horizontal cutting by the wire saw 6, and to perform horizontal cutting smoothly.

Further, the boundary portion P between the upper protruding portion 21 and the structure
The core P is continuously drilled in the vertical direction to cut the boundary P in the vertical direction, and
Insertion holes 3, ... Are vertically provided at a plurality of positions of the boundary portion P from the upper surface side of the projecting portion 2 in the vertical direction and the horizontal cutting position 2 of the upper projecting portion 21 is cut.
By drilling up to 1a, the upper protrusion 21 and the boundary P
And can be separated. At this time, since the core boring device 30 is used to form not only the small-diameter hole 8 but also the insertion hole 3, the drilling work for cutting the boundary portion P and the drilling of the insertion hole 3 are performed. Installation work can be performed in parallel and work efficiency can be improved.

Further, the hydraulic jacks 4, ... Are respectively loaded in the plurality of insertion holes 3, ... And the hydraulic jacks 4, ... Are installed at predetermined intervals on the outer peripheral side of the upper step portion 21 other than the boundary portion P. , Above the upper step portion 21, the jack 4,
The H-section steel 5 is arranged so as to be bridged between the upper end portions 41 of the ... And by connecting the H-section steel 5 and the upper step portion 21, the H-section steel 5 connected to the upper step portion 21 is hydraulically operated. The jack 4 can make a state in which a force can be applied in the upward direction.

Further, since the upper step portion 21 and the H-section steel 5 are connected by the chemical anchor 7, a strong fixing structure can be constructed by an easy method. Can be connected stably and firmly.

In the present embodiment, the H-shaped steel is used for the cross member 5, but the present invention is not limited to this, and any material having sufficient strength may be used. Furthermore, H
Although it has been decided to bridge the hydraulic jack 4 having the shaped steel 5 loaded in the insertion hole and the upper end portions of the hydraulic jack 4 arranged on the outer peripheral side other than the boundary portion of the upper protruding portion, the present invention is not limited to this. The point is that the horizontal member and the upper protruding portion can be connected to each other and the horizontal member can be bridged between the upper end portions of the jacks on the upper surface side of the upper protruding portion.

Further, the projecting portion 2 is the step 2 (internal projecting portion) formed inside the vertical shaft 10, but the projecting portion 2 is not limited to this, and for example, the projecting portion formed projecting on the wall surface, etc. The point is that it may be a protruding portion having a boundary portion that is joined to the structure.

Further, the boundary portion P is cut by continuously boring a plurality of holes by core boring, but it is not limited to this, and for example,
It may be a hole or the like, and the point is that the structure and the projecting portion can be cut in the vertical direction at the boundary portion P.

[0051]

According to the method of cutting a structure in the first aspect of the present invention, first, the boundary between the structure and the portion to be cut is cut in the vertical direction so that the portion to be cut is cut from the structure in the vertical direction. It is possible to separate the wire saw and to arrange the wire saw. Furthermore, insertion holes are drilled in the vertical direction up to the horizontal cutting position at a plurality of positions on the boundary, respectively, and then,
The jack is loaded into each of the insertion holes, and then the cross member and the cut member, which are arranged so as to bridge over the upper end portions of the jacks above the cut member, are connected to the cut member, thereby pushing up the jack. It becomes a state in which the force of can be applied to the cross member. Therefore, when the horizontal member is pushed upward by the jack and the horizontal cutting of the cut portion by the wire saw progresses, the path of the wire saw is blocked by the load of the already cut portion of the cut portion. It is possible to prevent the wire saw from being pinched between the parts to be cut and pressed. As a result, horizontal cutting of the portion to be cut by the wire saw can be smoothly advanced.

According to the invention of claim 2, not only the same effect as in claim 1 can be obtained, but also the hole extending from the upper surface side of the cut portion to the horizontal cutting position is formed along the boundary portion. Since a plurality of holes are continuously drilled, even if the planar shape of the boundary portion is an irregular shape such as an arc-shaped curve, the boundary portion can be reliably cut. Further, the work of cutting the boundary portion by continuously forming a plurality of holes and the work of forming the insertion hole can be performed in parallel, and the work efficiency can be improved.

According to the invention of claim 3, not only the same effect as that of claim 1 or 2 can be obtained, but also the cut portion and the cross member are fixed through the chemical anchor. It has excellent fixing force, large pull-out strength, uniform and stable fixing force, and the part to be cut and the cross member are stably fixed. The part to be cut can be stably pushed up as it is pushed up.

According to the invention of claim 4, not only the same effects as those of claims 1 to 3 can be obtained, but the structure is a vertical shaft having an inner protruding portion formed on the inner wall surface. Yes, since the part to be cut is an inward protruding part, like the boundary part between this inward protruding part and the inner wall of the shaft, it is possible to cut the boundary part even in a limited space, and even in narrow places,
The inner protruding portion to be cut can be pushed up, and horizontal cutting of the inner protruding portion can be easily and smoothly performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a shaft in a first embodiment of a method for cutting a structure according to the present invention.

FIG. 2 is a plan view showing a state in which the method for cutting a structure according to the present invention is applied.

FIG. 3 is a cross-sectional view showing an example in which the method for cutting a structure according to the present invention is applied.

FIG. 4 is a diagram showing a schematic configuration of a core boring device used in the present embodiment.

FIG. 5 is a perspective view showing a schematic configuration of a vertical shaft to which a method of cutting a structure according to a second embodiment is applied.

FIG. 6 is a plan view showing a state in which the method for cutting a structure according to the present invention is applied to the vertical shaft of FIG.

[Explanation of symbols]

3 insertion holes 4 Hydraulic jack (jack) 5 H section steel (horizontal material) 6 wire saw 7 Chemical anchor 8 holes 10 Vertical shaft (structure) 21 Upper part (part to be cut) 21a, 81a Horizontal cutting position 41 upper end 81 Bottom (section to be cut) 101 inner wall surface P boundary

Claims (4)

[Claims] 1. A method of cutting a structure in which a part of the structure is cut from the structure by cutting the structure in a vertical direction and a horizontal direction. While cutting the boundary between the structure and the structure in the vertical direction, the insertion hole is formed in each of the boundaries in the vertical direction from the upper surface side of the part to be cut to the horizontal cutting position of the part to be cut. In the above, each of the plurality of insertion holes is loaded with a jack, and next, a transverse member is arranged above the portion to be cut so as to bridge the upper end portions of the jacks, and the transverse member and the portion to be cut are Then, while the horizontal member is being pushed upward by the jack, the portion to be cut is cut horizontally with a wire saw at a horizontal cutting position. 2. The method of cutting a structure according to claim 1, wherein a plurality of holes extending from an upper surface side of the cut portion to a horizontal cutting position of the cut portion are continuously provided along the boundary portion. A method of cutting a structure, characterized in that the boundary part between the part to be cut and the structure is cut in the vertical direction. 3. The method for cutting a structure according to claim 1, wherein a chemical anchor is fixed to the portion to be cut, and an upper end portion of the chemical anchor is fixed to a cross member to cut the cross member and the cut member. A method for cutting a structure, characterized by connecting the parts. 4. The method of cutting a structure according to claim 1, wherein the structure is a vertical shaft having an inner protruding portion formed on an inner wall surface, and the cut portion has an inner protruding portion. A method of cutting a structure, which is characterized by being a part.