JPS63112108A - Method of block cutting construction of reinforced concrete wall body and method of opening construction - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention can be used to cut a predetermined section of a reinforced concrete wall to a required depth, or roughly cut a predetermined section of a reinforced concrete wall to a required size and depth. The section cutting method and opening method for reinforced concrete walls are used to create openings in the walls.

[Conventional technology]

Conventionally, concrete cutters and the like have been used to cut sections of reinforced concrete crab bodies, and the above-mentioned concrete cutters and core drills have been used to make openings.

[Problem that the invention seeks to solve]

However, in the conventional section cutting method for reinforced concrete walls, due to the cutting mechanism of the concrete cutter used, the cutting depth is limited to about 50 cm, and the cutting speed is slow, and the cutting speed is slow. Due to rotational cutting, cutting a given cut section to the same depth from the center to each end required over-cutting beyond each end. Note that this excessive cutting of the end increases the man-hours for cutting work, and also has a negative impact on the beauty and strength of the surrounding area due to cutting over the uncut section.
It is something that gives rise to

On the other hand, using the section cutting method described above, a predetermined opening area is cut into a polygonal shape, and the columnar part in the opening area, which has been cut off from the surrounding area to a required depth, is removed by crushing or the like, and the opening is cut into a polygonal shape. However, due to the limit of the cutting depth of the concrete cutter, it was difficult to drill the hole to a depth of 5'Ocm or more.

In addition, by repeatedly drilling the above section cutting and crushing and removing the columnar part to form a secondary opening on the bottom of the shallow opening, or by sequentially drilling a tertiary opening and a quaternary opening in the same manner. In principle, it is not impossible to make deep openings, but with this repeated construction method, it is difficult to move and handle the concrete cutter within the existing openings, and the side walls of the existing openings get in the way. It is impossible to install the cosiclete cutter so that the blade is placed on the extension of the previous cut section, and furthermore, due to the excessive cutting of the ends mentioned above, it is difficult to cut parts that do not need to be cut, such as the bottom extension and side walls. Since cutting is involved, even if it were done, it would be impossible to extend the initial opening smoothly and accurately in the depth direction, and the removal of the column would result in fracture or excessive cutting of the end. In reality, it could hardly be adopted.

In addition, in the opening method using a core drill, the opening area is, for example, 10 to 30 cm due to the drilling mechanism of the core drill.
It is possible to make a deep opening to some extent when the diameter is as small as 1.5 m, but when the diameter is 1 to 1.5 m, the maximum opening depth is about 1 m, and especially when the diameter is 2 m or more, it is difficult to make a normal opening. It was almost impossible. However, it is also possible in principle to open a wide area by repeating drilling with a small-diameter core drill over the entire circumference or the entire area of the opening area. However, this method requires a huge amount of man-hours and costs due to repeated drilling operations, making it difficult to use it except in special cases.

Note that explosives, chemical expansion agents, hydraulic or manual crushers, etc. naturally cause destruction to areas other than the parts to be destroyed due to their destruction mechanisms, so they cannot be used alone to destroy reinforced concrete walls. It could not be easily adopted for accurate positioning and size opening.

The object of the present invention is to provide a section cutting method for a reinforced concrete wall that can cut a predetermined section of a reinforced concrete wall to a required depth, and a method for cutting a predetermined section of a reinforced concrete wall to a required depth. To provide an opening construction method for a reinforced concrete wall body, which can provide an opening of a desired size and depth in a predetermined area by cutting a predetermined section of the body to a predetermined depth.

[Technical means to solve problems]

The section cutting method for reinforced concrete walls according to the present invention is as follows:
(a) Drilling cable guide holes at each end of the cut section in the reinforced concrete wall; (b) Drilling the pulleys for each cable so that their pulley grooves and the cut section are in the same plane; (c) sterilizing the cutting cable in or on the extension of the guide hole; This process consists of a step of disposing the cutting cable between the holes, and (d) a step of circulating the disposed cutting cable while being pulled by a cable drive device.

Further, the opening construction method for a reinforced concrete wall according to the present invention is an opening construction method using the above-mentioned section cutting method, and (a
) drilling cable guide holes at each end of the cut section in the polygonal opening area of the reinforced concrete wall;
(b) placing a pulley within or on an extension of each cable guide hole such that the pulley grooves and the cutting section lie in the same plane; (c) placing the cutting cable in the cutting section; (d) disposing the disposed cutting cable between adjacent cable guides so as to pass through each cable guide hole and be reversed by being hung on each pulley; (d) disposing the disposed cutting cable in a cable drive device and (e) removing the columnar part in the opening area which has been cut and separated from the surroundings to a required depth.

Wire sawing, a cutting method in which a cutting cable is hung over the object to be cut and circulated while being pulled, is a cutting method that has conventionally been used exclusively for cutting stone in quarries. is applied in a special manner. As the cutting cable, for example, a wire lobe in which beads having a layer of diamond abrasive grains, coil springs or other spacers are alternately fitted, and stoppers made of steel rings or the like are crimped at required intervals can be used. Can be done. In addition, as a cable drive device, for example,
It is possible to use a cable drive pulley that runs the wound cutting cable and its rotation drive mechanism, and that moves on a rail with drive wheels or on a rack with a drive pinion. can.

[Action of the invention]

The operation of the section cutting method and the opening method according to the present invention will be explained in the case of drilling an opening of a desired shape and depth in a reinforced concrete wall.

<Section cutting method> First, a polygonal opening area is defined on a horizontal, vertical, or inclined reinforced concrete wall, and each side of the area is used as a cutting section to be cut. For example, use a core drill at both ends of each cutting section corresponding to the corners that sandwich each side.
~20cm diameter cable guide hole with required depth, e.g. 5~
The tunnel will be drilled to a depth of 10m. The cable guide hole above is
Before the first section cutting begins (this may be done in advance, the holes may be drilled around the entire circumference of the opening area at once, or as each section is cut (accompanied by this, the holes may be drilled sequentially from the cutting point). For example, if the opening area is square, a total of four cable guide holes will ultimately be drilled in each of the four corners.

Each cable guide hole may be perpendicular or inclined to the surface of the reinforced concrete wall, and even if adjacent cable guide holes are parallel within the reinforced concrete wall, they may be widened or tapered. It may be oriented in the same direction, or it may be perforated so as to penetrate roughly from the front surface to the back surface and side surfaces.

The pulleys are then rotatably installed, e.g. via an immovable support shaft, at respective positions at the same or different depths within or in the extension of adjacent cable guide holes. be done. A case where the pulley is installed on an extension of the cable guide hole means a case where the cable guide hole is drilled through a reinforced concrete wall and the pulley is installed so as to protrude beyond the cable guide hole. . Each pulley is arranged so that its pulley groove and cutting section are on the same plane so that the wire saw ink, which will be described later, can be performed in an accurate position and smoothly.

The above-mentioned pulleys may be installed in all the cable guide holes at once before the first section cutting begins, or as the section cutting progresses, the pulleys may be placed one after another from the cable guide hole associated with the section. Alternatively, after cutting a rough cutting section, the previously used pulley can be used as is by orienting it in the direction of the new cutting surface when cutting the next adjacent cutting section.

Subsequently, the cutting cable is hooked from the cutting section to a pulley located inside each adjacent cable guide hole or on its extension, and is reversed toward the large entrance of each cable guide, so that it is arranged in a substantially W-shape. . Each pulley may be a combination of two or more wheels as long as it guides and suspends the cutting cable as described above, and also has a mechanism to prevent the cutting cable from falling out of the pulley groove, such as a cable retainer using a spring. It may also be equipped with a mechanism.

Note that the above-described arrangement of the cutting cable may be performed simultaneously with the installation of the pulley in each cable guide hole.

In this way, the cutting cable placed between the two cable guides is connected at both ends so as to have an appropriate loop length, and is hung on an appropriate cable drive.
It is made to circulate while being biased to the required tension. If necessary, a guide pulley may be installed inside or outside each cable guide hole between each pulley and the cable drive device to smoothly guide the circulating cutting cable.

In addition, as an aspect of the wire saw ink, instead of the above configuration, each pulley is pressed and driven in the depth direction along each cable guide hole, and the cutting section is cut to a predetermined depth by the circulating cutting cable. It is not impossible to disconnect the pulleys, but in that case, not only would it be necessary to install a complicated drive mechanism for suppressing each pulley, but also a complicated drive mechanism between each pulley to adjust the depth between both pulleys. It is unsuitable because it requires complicated adjustment between the drive mechanism of each pulley and the cable drive device to adjust the cutting speed and tension of the cutting cable, and is especially inappropriate for concrete layers such as reinforced concrete walls. It is difficult to perform stable and steady wire sawing on heterogeneous objects that include reinforcing bars with completely different strengths and hardnesses, so it is currently difficult to use.

With the wire saw ink according to the present invention, the cutting sections between adjacent cable guide holes are sequentially cut in the depth direction of the cable guide hole by frictional contact with the running cutting cable, and at the end of each pulley cut to the depth of the outer tangent line connecting the pulley grooves. In addition, the pulley is
If the cable is installed as an extension of each cable guide hole and protrudes from the back or side of the reinforced concrete wall,
The above-mentioned section cutting extends from the front surface to penetrating the back surface and side surfaces.

The tension of the cutting cable can be maintained and adjusted as wire sawing progresses, for example, by driving the cable drive device along a track such as a rail or rack. Alternatively, another tension pulley may be moved gradually while the tension pulley is fixed.

Once the cutting cable has been installed, if necessary via a suitable guide pulley, so as to be able to circulate between the cutting section and the cable drive, the cutting operation is carried out by cutting the internal reinforcing steel. Since everything including complete cutting is controlled remotely by the cable drive device, there is no need for a cutting operator to constantly engage in cutting work at the cutting site, and automatic operation can be easily introduced.

The running speed and tension of the cutting cable are appropriately selected depending on the cutting depth and other cutting conditions, but in normal cases, the running speed is about 20 to 30 m/sec, and the tension on the tension side is 5.
It is about 9 in 0 to 150, and under these cutting conditions, the reinforced concrete wall including the internal reinforcing bars can be completely cut.

When performing wire sawing, it is preferable to supply water to the cutting area and the cutting cable for cooling, lubrication, cleaning, etc. As a water supply method, for example, water may be poured into the cable guide hole or the cutting section. In some cases, when the reinforced concrete wall to be cut is partially underwater, such as the reinforced concrete embankment of a dam, trees around the wall can be used for water injection. Furthermore, when the cutting location is underwater, water is naturally supplied from the surrounding area as wire sawing is performed, making it unnecessary to actively pour water from outside.

In the section cutting method for reinforced concrete walls according to the present invention as described above, it is possible to cut sections to the required length and depth by working only from the front side of the reinforced concrete wall. In cases where it is necessary to keep the cutting depth at a specified depth without penetrating to the back or sides, or it is possible to cut sections to the back or sides, but for some reason cutting cannot be done from the back or sides. It is particularly useful for

<Opening method> When the entire circumference of the opening area is cut from the surface side to the required depth by repeating the above-mentioned section cutting, the inner columnar part surrounded by each cut surface, that is, if the opening area is square, The columnar part of the quadrangular prism is separated from the surrounding walls.

Therefore, the columnar parts are crushed or cut into pieces that can be carried out using a crushing means such as a chemical expansion agent or a hydraulic crusher, a concrete cutter or other cutting means, or a combination of these, and are sequentially transported outside. After the columnar portion is removed, an opening is formed. If the above-mentioned section cutting is performed so that the columnar portion has a tapered shape in the depth direction, it is easy to crush and discharge the columnar portion after cutting.

When the opening area is wide, it is possible to make the removal work of the columnar part easier by dividing the columnar part into smaller sections by performing the section cutting not only around the area but also inside it, or vertically or horizontally. can.

Further, by repeating the above-mentioned opening method in the depth direction, an opening with a required depth can be easily formed. In that case, when reinstalling each pulley at a deeper position along the cable guide hole, for example, by sequentially connecting an extension shaft to the support shaft by known means, the pulley can be extended to the required length. Can be done.

In addition, when chemical expansion agents and crushers are used normally, there is a risk that the destruction will spread beyond the part to be destroyed, as mentioned above, but when used to remove the columnar parts mentioned above, Since the portion is already cut and separated from the surrounding wall, the above problem does not occur even if these crushing means are used.

In the above-mentioned opening method for a reinforced concrete wall according to the present invention, it is possible to open an opening of the required size and depth by working only from the front side of the reinforced concrete wall. It is necessary to keep the opening at a predetermined depth without penetrating it with a gate, or it is possible to penetrate the opening to the back or side, but for some reason cutting or opening cannot be done from the back or side. This is particularly useful in cases where

〔Example〕

Next, the present invention will be specifically explained based on examples. Note that the present invention is not limited to these examples,
It goes without saying that modifications or changes thereof in various ways are encompassed as long as they are limited by the scope of the claims and still achieve the purpose of the invention.

<Example 1> As shown in FIG. 1, which is a cross-sectional view illustrating an example of the section cutting method for a reinforced concrete wall according to the present invention, a cutting section (2) is set on a reinforced concrete wall (1). Cable guide holes (3a) and (3b) are drilled to a predetermined depth at both ends of the cable guide holes (3a) and (3b).
), (3b) Guide pulleys with different heights above (4)
.

(5) is anchored to the wall (1) by respective supports (6), (7). Further, a pair of rails (8) are laid on the wall (1) adjacent to the cutting section (2), and a cable-driven bag M (9) is movably attached to the rails (8). There is. The cable drive device (9) includes a cable drive pulley (10) and its rotational drive mechanism (not shown), and a drive wheel (11) fitted into the rail (8) and its rotational drive mechanism (not shown).
It consists of

Support shafts (12a), (12b) are inserted into each cable guide hole (3a), (3b) to a required depth, and their bases are anchored to the surface of the wall (1). In addition, pulleys (13a) and (13b) are rotatably mounted on the tips of the support shafts (12a) and (12b), and cable guide holes (3a) and (3
b) Flanges (14) (14) are provided to contact the inner wall and prevent swinging of the support shafts (12a), (12b) during wire sawing.

The cutting cable (15) is connected to the cable-driven bootsaw (1
0), the guide pulley (4), the pulley (13a) inside the cable guide hole (3a), the cutting section (2), the pulley inside the cable guide hole (3b)
13b), the guide pulley (5) and then back to the tension side of the cable-driven bootsaw (10).

In the above configuration, when the entire cable drive device (9) is driven in the direction of the arrow in the drawing while rotating the cable drive pulley (10) clockwise, the cutting cable (15)
The pulley (13a), (
13b) is cut to a depth position of 13b).

Example 2) As shown in FIGS. 2 and 3, which are a plan view and a central cross-sectional view illustrating the state after section cutting in an example of the opening construction method for a reinforced concrete wall according to the present invention, a wall (1 ) on the four sides of the cutting section (2p), (2Q), (2r),
A rectangular opening area (]6) consisting of (2s) is set, and based on the section cutting method as described above, cable guide holes (3p
), (3Q), (3r), and (3s) are drilled, and all the cutting sections (2p) to (2s), that is, the opening area (
16) The entire circumference is cut into sections to a required depth, and the columnar part (17) is cut and separated from the surrounding area.

Although illustration is omitted when cutting those sections, each cutting section (2p) to (2S) and the cable drive bag M (9)
By arranging the guide pulley appropriately between the cable drive device (9) and the cutting cable (15) so that it can be bent, all cable drive devices (9) can be attached to the rails (8) that were originally laid. Cutting section (2p) to (2S)
However, depending on the situation at the site, the location of the cable drive device (9) may be changed as necessary.

Next, as shown in FIG. 4, which is a central cross-sectional view illustrating the state after opening in an example of the opening construction method for a reinforced concrete wall according to the present invention, after section cutting around the entire circumference of the opening area (16), The inner columnar part (17) is removed from the root by crushing or cutting, and after the removal, a predetermined opening (18) is formed.

〔Effect of the invention〕

As described above, in the section cutting method for a reinforced concrete wall according to the present invention, a cable guide hole is bored at each end of the cut section in the reinforced concrete wall, and a pulley is installed inside or on the extension of the cable guide hole. , cutting cables are arranged in a substantially W-shape in the cutting section and each pulley to perform sawing. Therefore, according to this section cutting method, a predetermined section of a reinforced concrete wall can be cut to the required depth without excessive cutting of the ends and by working only from the surface side. .

On the other hand, in the opening construction method for a reinforced concrete wall according to the present invention, the entire circumference of the polygonal opening area is cut to the required depth by the above-mentioned section cutting method, and the separated columnar parts are removed by crushing, cutting, etc. It is composed of

Therefore, according to this opening method, an opening of the required size and depth can be drilled in a predetermined area of a reinforced concrete wall without excessive cutting at the end and by working only from the surface side. can be set.

[Brief explanation of the drawing]

FIG. 1 is a sectional view illustrating an example of the section cutting method for a reinforced concrete wall according to the present invention, and FIGS. 2 and 3 show the state after section cutting in an example of the section cutting method for a reinforced concrete wall according to the present invention. A plan view and a central sectional view to explain,
Further, Fig. 4 is a central sectional view illustrating the state after opening in an example of the opening construction method for a reinforced concrete wall according to the present invention.6 <Explanation of main symbols> ]...Reinforced concrete wall, 2, 2p, 2Q
. 2r, 2s = cutting section, 3a, 3b, 3p. 3 q, 3 r, 3 s-cable guide hole, 9
-... Cable drive device, ]0... Cable drive pulley. 12a, 12b--support shaft, 13a, 1
3b - pulley, ] 5... cutting cable, 1
6...Opening area, 17-...Columnar part, 18-...
・Applicant for patent above the opening Daimo Co., Ltd. Agent Patent attorney Atsushi Ando Figure 1 Lll jL chair shaft

Claims (1)

[Claims] 1. (a) Drilling cable guide holes at each end of the cut section in the reinforced concrete wall; (b) Drilling the pulleys so that their pulley grooves and the cut section are in the same plane. (c) installing the cutting cable within or on an extension of each cable guide hole, as shown above; A section cutting method for a reinforced concrete wall comprising the steps of: (d) arranging the installed cutting cable between both cable guide holes so as to be reversed; and (d) circulating the installed cutting cable while being pulled by a cable drive device. 2. The section cutting method for a reinforced concrete wall according to claim 1, wherein each pulley is installed via a support shaft fixed in an immovable state. 3. The section cutting method for a reinforced concrete wall according to claim 2, wherein the support shaft is extendable. 4. The section cutting method for a reinforced concrete wall according to claim 2, wherein the support shaft is provided with a protruding flange that contacts the inner wall of the cable guide hole. 5. (a) Drilling cable guide holes at each end of the cut section in the polygonal opening area of the reinforced concrete wall; (b) Drilling the pulleys so that their pulley grooves and the cut section are in the same plane. (c) installing the cutting cable within or on an extension of each cable guide hole, as shown above; To reverse the
a step of arranging the cables between adjacent cable guide holes, (d
) Reinforced concrete consisting of a step of circulating the installed cutting cable while being pulled by a cable drive device, and (e) a step of removing the columnar part in the opening area that has been cut and separated from the surrounding area to the required depth. Wall opening method. 6. The method for opening a reinforced concrete wall according to claim 5, wherein each pulley is installed via a support shaft fixed in an immovable state. 7. The method for opening a reinforced concrete wall according to claim 6, wherein the support shaft is extendable. 8. The method for opening a reinforced concrete wall according to claim 6, wherein the support shaft is provided with a protruding flange that contacts the inner wall of the cable guide hole.