JPH02225006A - Engineering method for ply separating concrete structure - Google Patents

Abstract

PURPOSE:To make it possible to accurately, rapidly and efficiently cut the specified separating place in the form of a cube even out of any part of a concrete structure by a method wherein the wire saw engineering method and cutter type wall saw engineering method are used in combination. CONSTITUTION:At the location near the separating place 2 of a concrete structure 1, at least two guide grooves 4, each of which is enough wide and deep for installing wire saw 7, are formed in parallel arrangement by cutting from the front side of the structure with a cutter type wall saw 5 so as to install the guide pulleys 5 of the wire saw 7 at the corresponding end parts of the respective grooves 4. The endless wire saw 7, which is lead from a wire saw drive 6 and wound round the guide pulleys 5, is wound round the outer periphery of the separating place 2 of the concrete structure along the two guide grooves 4 and 4. When the wire saw driver 6 is run under the above-mentioned state, the wire saw 7 is run along a course guided by the guide pulleys 5 and 5 under the condition that the cutting reaction of the wire saw is received by a pair of the guide pulleys 5 and 5 locating at the end parts of the guide grooves 4 and 4, resulting in cutting the separating place 2 of the concrete structure 1 in the planar form in succession towards the positions of the guide pulleys 5 and 5 and finally allowing to precisely cut out the specified part.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is particularly useful in demolition work of radioactive concrete structures or radioactively contaminated concrete structures of nuclear power generation facilities. A concrete structure that is constructed locally by cutting out only those areas that require special disposal due to contamination, and in a size and shape that is easy to handle later, such as dice-shaped blocks. Used in surface layer peeling method.

Conventional technology Conventionally, surface layer peeling methods for concrete structures have been described, for example, in Japanese Patent Application Laid-Open No. 63-112108 and Japanese Patent Application Laid-open No. 63-19776.
They are described in Publication No. 6, etc., and are classified as publicly known.

JP-A-63-112108 and JP-A-63-1977
The surface layer peeling method described in Publication No. 66 is
As illustrated in the figure, at least two wire saw guide holes C, C are drilled with a drilling machine such as a core drill at positions on both sides of the peeling point in the concrete structure a,
The wire saw e guided from the wire saw drive machine d is wound around the guide pulley g installed by being inserted into the two wire saw guide holes C at a predetermined depth position by the support shaft f, and the wire saw The wire e is wrapped around the outer circumference of the concrete peeling point, and the wire saw e is driven by the wire saw drive machine d to cut out the concrete structure and achieve the purpose of surface layer peeling.

Problems to be solved by the present invention
The surface layer peeling method described in Method No. 7766 requires that wire saw guide holes C and C be drilled in the concrete structural article. Therefore, the ninth
As is clear from the figure, there must be a work space in which a drilling machine such as a core drill can be installed and drilling work further above the upper end of the concrete structure a, especially at the peeling site.

Therefore, with these conventional construction methods, it is almost impossible to remove only a limited area of the inner surface of a concrete structure as shown in Figure 7, and this point is not applicable in practice. This is an issue that needs to be resolved as it is subject to constraints.

Means for Solving the Problems As a means for solving the problems of the above-mentioned prior art, the surface layer peeling method for concrete structures according to the present invention is as shown in the embodiments in FIGS. 1 to 8 of the drawings. a> A guide 114 with a width and depth sufficient for installing the wire saw 7 is approximately cut around the peeling point 2 of the concrete structure 1 from the surface side of the structure 1 using a cutter-type wall saw 3. forming at least two parallel guide grooves 4 and installing guide boos 95 of the wire saw 7 at corresponding ends of each guide groove 4; b) leading from the wire saw driver 6 and winding around the guide pulley 5; The endless wire saw 7 is the same as above 2.
Wrap it around the outer periphery of the peeled part 2 of the concrete structure l according to guide 1i4.4 of the book, and cut the corresponding part 2 of the concrete structure 1 by operating the wire saw drive machine 6. Characteristics (Figure 2.3).

In addition, the method for removing the surface layer of a concrete structure according to the second invention is as follows. forming a guide 114.4 of sufficient length and depth to install the saw 7 in the shape of at least a series of gates, and installing guide boos 95 of a wire saw at both ends of the guide 114 (FIG. 6); ) An endless wire saw 7 guided from the wire saw drive machine 6 and wound around the guide pulley 6 is wound around the outer periphery of the peeling point 2 of the concrete structure l along the guide 1i4,
Concrete structure 1 by operating wire saw drive machine 6
(Fig. 7.8).

In each of the above-mentioned inventions, a series of recesses 8 are formed at the end of the guide groove 4 with sufficient length and depth to install the guide pulley 6, the guide pulley 5 is installed in the recess 8, and the guide pulley 5 is installed in the recess 8. Wrapping the wire saw 7 around the peeling point 2 of the concrete structure 1 via the guide boo 95 (see the first drawing and the second drawing or the sixth drawing)
7), the formation of the guide groove 4 or the formation of the recess 8 is carried out by cutting the concrete structure 1 with a double cutter type wall saw 3, and at the same time cutting the uncut portion 10 remaining in the middle of the double cutter 3. (Fig. 1 A-D).Furthermore, when the wire saw drive machine 6 is operated to cut the peeled part 2 of the concrete structure 1 to the desired position, the position of the guide boo 95 is They are also characterized in that they are moved to a forward position approximately perpendicular to the cut surface, and the wire saw drive machine 6 is operated again to completely cut out the peeling location 2 of the concrete structure 1 (FIG. 5). .

Operation When the wire saw drive machine 6 is operated, the wire saw 7 is moved by a pair of guide pulleys 5, located at the ends of the guide groove 4.4.
The cutting reaction force (reaction force of tension) is applied to the concrete structure 1, and the guide pulleys 5, 5 travel along the route guided (defined) by the guide pulleys 5, 5, and the peeling points 2 of the concrete structure 1 are successively removed by the guide pulleys. 5. Cut flat toward position 5,
You can precisely cut out specific parts.

When cutting out the peeling point 2 from the end face of the concrete structure 1 (Fig. 2), first peel off at least two guides 11I4, 1III! It is sufficient to form it at one location and two peripheral positions.

When cutting the stripping point 2 at a location that does not include the end face of the concrete structure 1 (No. 6.71i!I),
This objective is achieved by forming the guide II 4.4' in the form of a series of gates. Regardless of whether an end face is included or not, if a series of recesses 8 are formed at the end of the guide 1i4 and a guide pulley 5 is installed in this recess 8, the guide pulley 5 will define the The concrete structure 1 can be precisely cut in a plane with the depth (thickness) up to the traveling guide position of the wire saw 7.

Moreover, if the position of the guide pulley 6 is changed from the position of the end of the guide groove 4 to the front position approximately perpendicular to the cut surface of the surface of the concrete structure l by about 90 degrees, (Fig. 5), the peeled portion 2 cut vertically to this repositioning position can be roughly cut horizontally to form a dice-shaped block.

Example The illustrated invention will now be described in detail.

First of all, Figures 1 to 5 are plane views starting from the end of a concrete structure 1 of a nuclear power generation facility, for example, by limiting the area to a certain wall thickness only to areas that are particularly radioactive or contaminated with radioactivity. The case where surface layer peeling (cutting) is performed is shown.

FIGS. 1A to 1D show steps for sequentially forming recesses 8 in the guide groove 4 and its corresponding ends.

Figures A and B are shown schematically for convenience of illustration. A 21-force wall saw 3 is used to cut the concrete structure 1 from the inside surface! 1 shows the preliminary stage of cutting the positions on both sides, which are the outer peripheral positions of the separated portion 2, to form the guides tJII4, 4.

For example, the double cutter type wall saw 3 is manufactured by Co., Ltd.
Reinforced concrete cutting machine sold by Taisho Kiko Construction (
NS Type Utsu-Rusou DC-300) etc. can be used.

This is a configuration in which, for example, two disc-shaped cutters with a diameter of φ900 and a blade width of 21 are installed in parallel at an interval of about 45fl111. By repeating the dropping operation, it is possible to cut the concrete structure 1 to a depth of approximately 50c+g. As a result, as shown in FIG. 1B, the guide 114.4 can be quickly formed with a length (approximately 501) and a depth of approximately 50 cw+, which is sufficient to install a wire saw.

FIGS. 1C and 1D show that both sides of the corresponding lower ends of the guide groove 4 formed as described above are cut using a double-cutter wall saw 3 to create a width sufficient to install the guide pulley. The procedure for forming the recess 8 (deep and deep) is shown in the order of steps. In this case as well, in order to secure the necessary frontage width for the recess 8, it is necessary to cut into the concrete with the double cutter type wall saw 3,
The operation of cutting off the uncut portion 10 remaining in the middle of the cutter is repeated.

FIGS. 2 and 3 show a guide pulley 5 installed in the recess 8 formed as described above, and an endless cable guided from the wire saw drive machine 6 and wound around the pair of guide pulleys 5.5. The wire saw 7 is wound around the outer periphery of the peeling point 2 of the concrete structure 1 along the two guide grooves 4.4, and the wire saw drive machine 6 is operated to cut the peeling point 2 of the concrete structure 1. It shows the cutting stage. 11 in Figure 3 is a safety net, 12 is a wire saw 7
shows the cutting grooves.

As the wire saw drive machine 6, for example, Utility Model No. 62-1
Known materials such as those described in Japanese Patent No. 66005 can be used. In addition, as the guide pulley 5, for example,
Those described in No. 2-166006 and Japanese Utility Model Application Publication No. 62-166007 can be selectively used. Furthermore, as the wire saw 7, for example,
316 and Utility Model Application Publication No. 63-13614, it is possible to selectively use flexible wire lobes fitted with diamond beads (cutting beads) at a constant pitch. can. Wire saw 7 is
The cutting of the conchnaut is carried out planarly along the path guided by the pair of guide pulleys 5.5 at a cutting speed of about 1 to 2n12 per hour, thereby achieving the purpose of surface peeling in a specified area. The tension of the wire saw 7 during cutting is about 100 kg at the maximum, and the reaction force during cutting based on this is borne and handled by the pair of guide pulleys 5.5.

A feature of the cutting of the concrete structure 1 by the wire saw 7 is that the cutting progresses rapidly in the part where the tension of the wire saw 7 is maximum, and as a result, two guide grooves 4.4 are formed as illustrated in FIG. The cutting shape of the upper side between the two is likely to be arcuate. When cutting progresses to near the installation position of the guide pulley 5 in this shape, the tangent line of the wire groove on the guide pulley 5 and the traveling path of the wire saw 7 will deviate greatly, and the wire saw 7 will eventually move away from the guide pulley 5. There is a risk that you will run into trouble that will cause you to go off track. As a countermeasure, the guide pulley 5 is mounted on a mounting base 13 74 and the support arm 14 of the guide pulley 5 is rotatably mounted via a rotating mechanism 15, as illustrated in FIGS. 5 is the 411th! As shown in IA, it is preferable to use a structure in which the wire saw 7 sequentially turns and follows changes in the traveling path of the wire saw 7 (a), (b), and (b).

As described above, when the wire saw 7 has proceeded to the desired position by cutting the peeled area 2 in the vertical direction, if it becomes necessary to completely cut out the peeled area 2, as shown in FIG. The guide pulley 6 is removed from the recess 8 and replaced, that is, the guide pulley 5 and the wire are moved to a forward position approximately perpendicular to the lower end position of the cut 2JI (cut surface) 12 that occurred in the concrete structure 1. The saw 7 is replaced, and then the wire saw drive machine is operated again to advance the transverse cutting of the concrete structure 1 toward the surface side and cut out the peeling location 2 into dice-shaped blocks.

2nd Embodiment Figure 146 shows a wire saw on both sites and the upper side along the peripheral position of the peeling area 2 to cut out the peeling area 2 at a location that does not include the end face of the concrete structure. The guide grooves 4 and 4' are formed into a series of gate shapes with a width and depth sufficient to install a guide pulley 5 at the end of the guide groove 4. This shows a stage in which recesses 8 of (frontage width) and depth (depth) are formed in series. The guide II 4° 4' and the recess 8 are formed by cutting from the surface side of the concrete structure 10 using a double-cutter wall saw.

FIGS. 7 and 8 show a guide pulley 5 installed in the recess 8 formed as described above, and an endless cable guided from the wire saw drive machine 6 and wound around the pair of guide pulleys 5.5. Guide the wire saw 7 into a gate shape fi4.4'
The wire is wound around the outer periphery of the peeled part 2 of the concrete structure 1 along the line, and the wire saw drive machine 6 is operated to cut the peeled part 2 of the concrete structure 1.

Once the peeling point 2 is cut in the longitudinal direction to a predetermined position in the manner described above, the guide pulley 5 and wire saw 7 are then carefully cut as shown in FIG. 5 of the first embodiment. The process of cutting out the peeled portion 2 in a block shape by cutting in the horizontal direction is the same as in the first embodiment.

Further embodiments The formation of the guide 14.4' and the formation of the recess 8 can also be carried out using a commonly used concrete cutter instead of a double-cutter wall saw. In this case, the guide groove 4 is wide enough to install the wire saw 7.
．． In order to form the wire 4', it is sufficient to cut it with a cutter having a blade width slightly larger than the diameter of the wire, thereby eliminating the need for the cutting operation.

The eleven effects of the present invention are as described in detail in conjunction with the examples, and the surface peeling method for concrete structures according to the present invention is equivalent to a combination of the wire saw method and the cutter wall saw method. With this tool, it is possible to accurately, quickly and efficiently cut out the identified peeling point 2 in the shape of a dice block even from the part of the concrete structure l, that is, the part including the end face or the part not including the end face. That is, as long as there is a work space on the surface side of the peeling location 2 in which the cutter-type wall saw 3 can be operated, it can be carried out regardless of the location.

In addition, the surface layer peeling method of the present invention can be applied to concrete structures 1
This can be carried out by simply forming a guide groove 4.4' through which the wire saw 7 passes, and there is no need to drill an unnecessarily large wire saw guide hole as in the conventional method, and there is no wasted work.
Moreover, the position, arrangement, and length of guide II4゜4',
By simply changing the depth, the size, thickness, shape, etc. of the peeling area 2 to be cut out can be freely selected and carried out, resulting in excellent flexibility in the range of application.

[Brief explanation of the drawing]

Figures 1A-D are explanatory T44 layers that sequentially show the process of forming guide grooves and recesses, Figure 2 is a perspective view showing the arrangement of the guide pulley and wire saw, and Figure 3 is a wire saw drive machine. 4A and B are front and side views of the swivel guide pulley, and FIG. Figure 6 is the second
FIG. 7 is a perspective view showing the arrangement of the wire saw and guide pulley, and FIG. 8 is a perspective view showing how the guide grooves and recesses are formed in the example. FIG. 9 is an elevational view showing a certain situation, and a cross-sectional view showing the implementation situation of the conventional surface layer I4 separation method. l... Concrete structure 3... Cutter type wall saw 4.4'... Guide groove 6... Wire saw drive machine 8... Recess 12... Cutting groove 2... Peeling location 5 ...Guide pulley 7...Wire saw lO...Non-cutting part Fig.A Fig. Fig.Fig.

Claims (1)

[Scope of Claims] [1] a) By cutting with a cutter-type wall saw from the surface side of the concrete structure around the peeling point, the width and depth are sufficient to install a wire saw. forming at least two guide grooves in a substantially parallel arrangement, and installing a guide pulley of a wire saw at a corresponding end of each guide groove; The method comprises the steps of: winding the endless wire saw around the peeled part of the concrete structure along the two guide grooves, and operating the wire saw drive machine to cut the corresponding part of the concrete structure. A surface peeling method for concrete structures. [2] a) At least a series of guide grooves with a width and depth sufficient for installing a wire saw are created around the peeling point of the concrete structure by cutting with a wall saw cutter from the surface side of the structure. b) forming an endless wire saw into a gate shape and installing guide pulleys of a wire saw at both ends of the guide groove, b) guiding an endless wire saw guided from a wire saw drive machine and wound around the guide pulley along the guide groove; A method for removing the surface layer of a concrete structure, comprising the steps of: wrapping the wire around the peeled part of the concrete structure, and cutting the corresponding part of the concrete structure by operating a wire saw drive machine. [3] At the end of the guide groove, form a series of recesses with sufficient width and depth to install the guide pulley, install the guide pulley in this recess, and use the guide pulley to connect the wire saw to the concrete. A surface layer peeling method for a concrete structure according to claim 1 or 2, characterized in that the layer is wrapped around a peeled part of the structure. [4] The formation of guide grooves or recesses is performed by cutting the concrete structure with a double cutter type wall saw and scraping off the uncut portion remaining in the middle of the double cutter. Claim No. 1
Surface layer peeling method for concrete structures described in Section 2 or Section 2 or Section 3. [5] When the wire saw drive machine is operated to cut the peeled part of the concrete structure to the desired position, the guide pulley is moved to a forward position approximately perpendicular to the cutting surface, and the wire saw is used again. A method for removing the surface layer of a concrete structure as set forth in claim 1, 2, or 3, characterized in that a driving machine is operated to cut out the peeled portion of the concrete structure.