JPS63197766A - Concrete cutting method and apparatus - Google Patents

Abstract

(57) [Summary] 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 is applicable to the demolition of concrete structures, particularly when there is no other method of demolition than a frontal approach, such as demolition of biological shielding concrete in decommissioned reactors. The present invention relates to a concrete cutting method and apparatus suitable for use in demolishing structures.

``Prior Art'' Due to various constraints, bio-shielding concrete walls and the like at decommissioned reactors are often cut into blocks and then dismantled.

As shown in Fig. 8, the cutting method in this case is that the vertical cutting plane A and the horizontal cutting plane B are generally cut using a wall saw, and the cutting plane C corresponding to the back side is cut by using, for example, a wall saw. A cutting method is adopted in which core holes are continuously drilled.

``Problem to be solved by the invention'' In the conventional cutting method described in 3, cutting surface C is made by continuous drilling of core holes, so it is more efficient than cutting work on other cutting surfaces B and C. Not.

That is, to explain this point with reference to FIG.
The cutting length is Δg, which is approximately equal to the diameter of the core hole.
However, in order to obtain this cutting length Δσ, it is necessary to cut the circumferential length of the core hole by drilling. It can be seen that the cutting efficiency is considerably lower than that of the other cutting surfaces B and C. In other words, in the case of continuous drilling of core holes, the cutting width W is equal to the hole diameter of the core hole, so the cutting width W is significantly larger than the cutting width using a wall saw etc., and the energy for cutting is correspondingly large. You will also need a lot of it.

"Means for Solving the Problems" The concrete cutting method of the present invention includes the steps of forming a pair of core holes extending in the cutting depth direction on both ends of the cutting length of the concrete to be cut, and By winding a wire saw between both guide pulleys respectively provided at the tips of a pair of support arms for insertion, and inserting the guide bools into both core holes of nη,
positioning a portion of the wire saw between the guide pulleys on the concrete surface between the core holes;
The method includes the step of cutting the concrete between both core holes by applying tension to the wire saw while running the wire saw.

The concrete cutting device of the present invention also includes a pair of support arms that are held parallel to each other by a holding member and each has a guide pulley at its tip, and a support arm that is wound outwardly around both guide pulleys. The present invention includes a wire saw, a drive unit for driving the wire saw to travel, and an operating device with a movable boom that is coupled to the holding member and controls the position of the holding member.

"Operation" When the wire saw is driven to travel with the guide pulleys wound with the wire saw inserted into the two core holes, or while being inserted, and tension is applied to the wire saw, the tension between the guide pulleys of the wire saw The U-shaped curved portion exerts a cutting action on the concrete to be cut between the core holes. In other words, when tension is applied to a wire saw that travels in an endless trajectory, the portion of the wire saw between the guide pulleys is converted into a force that tends to move the shortest straight distance, and this force is transferred between the core holes. This will act as a cutting action on the concrete.

``Example'' The cutting method of the present invention is basically an application of a wire saw. Here, before going into the description of the example, the principle of cutting operation of the wire saw will be briefly described. 1st O
As shown in the figure, when a wire saw a tracing an endless trajectory is wound around the object to be cut and the wire saw drive pulley p is rotated to drive the wire saw a, the wire saw a cuts into the object to be cut. Then, cutting is continued by moving the wire saw drive unit in a direction that moves away from the object to be cut by the length slackened by the cut, that is, by constantly applying tension to the wire saw.

In this way, the wire saw is designed to continuously exert its cutting action by pulling in the cutting direction, but in the present invention, the cutting device is equipped with a pair of support arms each having a guide boob at the tip. A major feature is that the wire saw is made to exhibit a so-called push-cutting cutting action by applying a force in the pushing direction to the wire saw.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show process diagrams, and in these diagrams, reference numeral 1 indicates concrete to be cut, such as a bio-shielding concrete wall at a decommissioned reactor. When dismantling this concrete wall I into blocks, as explained in Fig. 8 of the multi-layer structure, use a wall saw etc. for cutting surfaces A and B as in the conventional method, and for cutting surface C. The construction method of the present invention will be adopted. An example will be described below.

First, a pair of core holes 2.2 extending in the cutting depth direction are formed at both ends of the cutting length of concrete l to be cut. For example, as shown in FIG. 2, a cutting device 5 is prepared which includes a pair of support arms 4.4 each having a guide pulley 3.3 at its tip.
Insert and position the part into the core hole 2.2. In addition,
Before this insertion operation, the wire saw 6 is wound around the guide pulley 3.3 in advance, and by the insertion operation, the part of the wire saw 6 between the guide pulleys 3.3 is positioned on the concrete surface between the core holes. It curves into a U-shape.

In this state, the drive section of the wire saw is driven to drive the wire saw to travel. Then, the portion of the wire saw 6 between the guide pulleys 3.3 cuts into the concrete l to be cut between the core holes 2.2 and exerts a cutting action, as shown in FIG.

In this case, if tension is always applied to the wire saw 6, the cutting action will be continuously exerted. That is, when tension is applied to the wire saw 6, the force is converted into a force that tends to move the part between the guide pulleys 3 and 3 of the wire saw 6, which runs in an endless trajectory, to the shortest straight distance, and is moved in the so-called pushing direction. This force causes strong friction against the concrete 1 to be cut, producing a cutting action.

According to this cutting method, it is possible to cut extremely efficiently compared to continuous drilling of the core hole, and the cutting depth can be up to the depth of the core hole. Furthermore, the cutting depth is not limited by the diameter of the blade (even the maximum diameter blade commonly used is about 60 cm).

FIGS. 4 to 6 show specific examples of concrete cutting equipment suitable for use in carrying out such cutting methods. This cutting device 5 consists of a pair of support arms 4.4 which are held parallel to each other by a holding member 7 and each of which has a guide pulley 3.3 at its tip.
, a wire saw 6 wound outwardly around both guide pulleys 3.3, a drive section 8 for driving the wire saw 6, and a drive section 8 coupled to the holding member 7 to operate the holding member 7. Operator IO with movable boom 9 for position control
It is mainly composed of.

In the illustrated example, the holding member 7 is formed into a rectangular plate shape, and a gear box ttS it is located near both sides of the holding member 7.
is fixed. The support arm 4.4 is then connected to these gearboxes 11. +1, respectively, and are provided so as to be slidable only in their own axial direction and parallel to each other. The support arm 4.4 is configured as a so-called round rack with teeth 12 formed on its surface at regular intervals along the longitudinal direction, while gearboxes 11 have gearboxes 11 that mesh with the teeth 12 of the support arm 4. A spur gear 13 is provided respectively. This spur gear 13 is connected to the holding member 7
The support arms 4.4 are fixed to the output shaft of a gear motor 14 with dual shafts provided above, so that the support arms 4.4 are configured to be slidable in the axial direction in synchronization with each other.

Further, the holding member 7 and the movable boom 9 are hinged together via a pin 15, and a cylinder 16 provided between the two allows the holding member and the movable boom to be connected by a cylinder 16.
That is, the structure is such that the bending angle between the support arm 4 and the movable boom 9 can be adjusted. Further, on both sides of the holding member 7 and on the rear end side of the support arm 4, holding rollers 18 are provided respectively to prevent the wire saw 6 guided from the guide pulley 3 to the wire saw drive unit 8 from falling off. It is being

When the concrete cutting device is configured in this way, not only can the insertion and positioning of the guide pulley 3.3 into the core hole 2.2 be easily performed by remote control, but also the support arm 4.4 can be slid freely. Therefore, a series of work methods can be adopted in which the wire saw 6 is driven while inserting the guide pulley into the core hole, and the concrete between the core holes is successively cut in the direction of the cutting depth. Of course, it is also possible to insert both guide bogs to the deepest part of the core hole from the beginning and then drive the wire saw.

Figures 7 (a) and (b) show another embodiment of the concrete cutting device. It mainly consists of a guide pulley 23, 23 attached to the support arm, a connecting member 27 that integrally connects the base end (upper end in the figure) of the support arm, and a weight 28 provided at the connecting member. has been done. The wire saw 6 is wound outwardly around the guide pulleys 23, 23 of this cutting device. Positioning fittings 29 are attached to the lower portions of the support arms 24 to prevent the guide pulleys 23 from coming into contact with the inner surface of the core hole 2. Furthermore, holding rollers 30 are provided on the outside of the base end portions of the support arms 24 to prevent the wire saw 6 guided from the guide pulley 23 to the wire saw drive unit from falling off. The weight 28 is used to press the cutting device with its weight and hold it in a set position. In the figure, reference numeral 31 indicates a hanging ring used for hoisting and positioning the cutting device with a crane or the like.

In addition, when carrying out the cutting method using the above-mentioned cutting device, the spacing between the core holes should be adjusted to the support arm 4.24.
It is necessary to drill holes at predetermined intervals to match the spacing between the holes.

Therefore, the holding member 7 of the support arm 4.24 and the connecting member 2
7, if the structure is provided with a spacing adjustment mechanism for the support arms 4 and 24, even if the core holes 2 are formed at arbitrary spacings according to the actual conditions of the work place, this can be easily coped with.

"Effects of the Invention" As explained above, the concrete cutting method of the present invention includes the steps of forming a pair of core holes extending in the cutting depth direction on both ends of the cutting length of the concrete to be cut; The process of winding the wire saw between both guide pulleys provided at the tips of a pair of support arms for insertion into these core holes, and inserting the guide pulleys into both the core holes respectively, allows the wire saw to be A construction method comprising the steps of: positioning the portion existing between the guide pulleys on the concrete surface between the core holes; and applying tension to the wire saw while running the wire saw to cut the concrete between the core holes. Therefore, the core holes do not need to be drilled continuously, but rather at intervals, and the cutting width can be made sufficiently small by cutting the concrete to be cut between the core holes with a wire saw, making the cutting work easier. can be carried out extremely efficiently.

In addition, the method of the present invention uses a pair of guide boobs to reverse the cutting direction of the wire saw, making it possible to cut in the pushing direction, even in demolition work where there is no other way than to approach from the front. You can deal with this without any problems.

Further, according to the concrete cutting device of the present invention, the insertion and positioning of the guide pulley into the core hole can be easily performed by remote control, and since the support arm 4 is slidable, the guide pulley can be inserted into the core hole. While inserting the core hole, move the wire saw and cut the concrete between the core holes in the direction of the cutting depth, or insert both guide boars to the deepest part of the core hole from the beginning. How to drive a wire saw, etc.
This has the advantage of being able to adopt work methods that suit the actual situation.

[Brief explanation of the drawing]

1 to 6 show embodiments of the present invention.
Figures (A) and (B) are process diagrams, Figure 4 is a partial plan view of the cutting device, Figure 5 is a partial side view thereof, Figure 6 is a schematic side view,
Figure 7 (a) is a front view showing another embodiment, Figure 7 (b)
7 is a sectional view taken along the line A-APA, FIGS. 8 and 9 are a perspective view and a plan view for explaining the conventional construction method, respectively, and FIG. 1O is a diagram explaining the principle of a wire saw. 1... Concrete to be cut, 2...
Core hole, 3... Guide pulley, 4... Support arm, 5... Cutting device, 6... Wire saw, 7... Holding part holder, 8... Drive section, lO... Operation device.

Claims (2)

[Claims] (1) A step of forming a pair of core holes extending in the cutting depth direction on both ends of the cutting length of the concrete to be cut, and forming a pair of core holes at the tips of a pair of support arms to be inserted into these core holes. By winding the wire saw between the guide pulleys and inserting the guide pulleys into the core holes, the portion of the wire saw between the guide pulleys is positioned on the concrete surface between the core holes. and a step of cutting the concrete between both core holes by applying tension to the wire saw while running the wire saw. (2) A pair of support arms held parallel to each other by a holding member and each having a guide pulley at its tip, a wire saw wound outwardly around both guide pulleys, and a wire saw that runs on the wire saw. A concrete cutting device comprising: a drive unit for driving; and an operating device with a movable boom coupled to the holding member to control the position of the holding member.