JP3489616B2 - Removal method of concrete wall structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a cutting apparatus for cutting and removing a concrete structure, in particular, a wall structure. 2. Description of the Related Art As a method of dismantling and removing a reinforced concrete structure, a method using a wire saw (Japanese Patent Publication No. 1-534).
No. 26, Japanese Patent Publication No. 1-53427) and a method using a diamond rotary blade. The wire saw method is a method of cutting a reinforced concrete structure or a stone material using a wire saw in which beads made by electrodepositing or sintering granular diamond are attached to a wire, which enables highly efficient cutting and gives it to the surrounding environment. Although there is an advantage that the influence is small, in any of the methods, since frictional heat is generated at the time of cutting, cooling water is supplied to the cut portion. Japanese Patent Application Laid-Open No. 6-128906 discloses a cutting device for cutting a wall structure such as a road divider or a side wall. In cutting a concrete structure, FIG.
When the rotary blade 34 penetrates to the opposite side of the concrete structure A as shown in FIG. 7, the cooling water flows out of the construction site, so that a temporary provision 7 for recovery must be provided. I was struggling. Even underground structures,
This effluent may contaminate the neighborhood and affect other structures and buried objects.In the case of structures such as elevated roads, the effluent drips, and people and vehicles passing below may be spilled. There is a problem in terms of both construction and cost in order to install a spill prevention material outside the structure so as not to contaminate it.Therefore, there is a need for the development of a method to cut and remove the cooling water without spilling it outside the construction site. I have. [0004] Further, in the conventional cutting apparatus, there is a case where the cutting reaction force cannot be sufficiently absorbed only by the weight of the apparatus itself. It was prevented from escaping from the cutting structure by the cutting reaction force. Therefore, prior to the cutting operation, an operation such as excavation of a groove on the road surface is required, and after cutting, the groove has to be refilled, which takes a lot of trouble. Therefore, there is a need for a cutting device that does not require the installation of a guide plate or a guide groove and can efficiently cut a structure. [0005] In cutting and removing a concrete wall structure, a cutting device having guide rollers for maintaining a constant cutting depth so as to leave a part of the thickness of the concrete wall horizontally is used. A cut was made, and the remaining thin wall portion was pulled up and cut off to prevent the cooling water from flowing out. First, a method of cutting and removing a concrete structure on a side wall of an elevated road will be described as an example of a cutting and removing method. FIG. 3 is a side view of a cutting apparatus used in the present invention. The vehicle body 1 is provided with front wheels 2 and rear wheels 3, and the output of the prime mover 14 is transmitted to the rear wheels 3 via a transmission 4 and a differential device 9 with a differential lock mechanism. The rotary blade 34 is of a disk type with a diamond chip attached, and is 800 to 1500 depending on the cutting depth.
mm. The rotary blade 34 is attached to the vehicle body 1 by a hydraulic cylinder so as to be movable vertically and horizontally. The rotary blade 34 is rotated to move horizontally to approach the concrete structure A to be cut, and is moved along the structure when cut to a predetermined depth.
The thin wall portion 6 is formed. A guide roller 35 for maintaining a constant cutting depth is attached to the cutting device of the vehicle body 1, and by adjusting the amount of protrusion of the roller and the amount of protrusion of the rotary blade 34, the thin wall portion 6 is about several millimeters. Determine the cutting depth so that it remains. By running the vehicle with the front wheel 2 cut toward the concrete structure A, a reaction force at the time of cutting is obtained by the side force acting on the front wheel. When the height of the concrete structure A is high, the concrete structure A is cut into several stages in consideration of handling of the cut structure. As shown in FIG.
Since the concrete structure A is cut while leaving the thin wall portion 6, the cooling water supplied to the rotary blade returns to the cutting device side without flowing out. Since it is sufficient to collect and process the effluent, the cutting operation can be performed without providing a temporary outflow preventive. The concrete structure A cut with the thin wall portion 6 remaining is pulled by a crane or the like to cut off the thin wall portion 6, and the remaining portion of the wall is removed. In order to prevent the structure A from collapsing during cutting, a holding member or a wire attachment is provided in advance to prevent the structure A from moving largely from the original position. The cutting device used in the cutting method will be described in detail. 3 and 4, a pair of front wheels 2 and a rear wheel 3 are provided before and after the vehicle body 1, respectively. The front wheel 2 can be steered in the left-right direction by a steering handle 50 via a speed reducer 53, a steering output shaft 60, and a gear box 63. At the rear of the vehicle body 1, a transmission 4 is installed, and the output of the prime mover 14 is
The output sprocket 5 is transmitted to the transmission 4 via the transmission belts 16 and 19, and the output sprocket 5 is connected to the differential device 9 with the differential lock mechanism via the transmission belt 6, and the rear wheel 3 is driven. On the other hand, an elevating platform 11 is incorporated in an elevating guide rail 10 provided on the vehicle body 1 so as to be vertically movable by a guide roller 12, and an elevating cylinder 13 is interposed between the vehicle body 1 and the elevating platform 11. The lifting cylinder 13 is connected to a control device (not shown). A prime mover 14 is provided above the lift 11. A cylindrical drive bearing box 21 is supported below the lift table 11 via bearings 22 horizontally and perpendicular to the center line of the vehicle body 1, and a spline cut slide shaft 23 is rotatable in the drive bearing box 21. In addition, the tool rest 25 is supported by a vertically movable guide rail 24 provided in the same direction as the axis of the drive bearing box 21 on the elevating platform 11 so that the tool rest 25 can be laterally moved via a guide roller 26. The tip of the slide shaft 23 is supported by a tool rest 25 via a bearing 27, and a horizontal movement cylinder 28 is interposed between the lift base 11 and the tool rest 25, and a lateral movement cylinder 28 is provided.
Are connected to the hydraulic control device. Further, a blade rotating shaft 29 which is vertically meshed with the slide shaft 23 and which is supported via a bearing 33 in a bevel gear storage box 31 and a bearing box 32 vertically mounted thereon.
The rotary blade 34 is fixed to the tip of the. This rotary blade 34
Are arranged between the respective axles of the front wheel 2 and the rear wheel 3. Further, the output pulley 15 of the prime mover 14 is
6 is connected to an input pulley 17 on a drive bearing housing 21, and an output pulley 18 on the drive bearing housing 21 is connected to an input pulley 20 of the transmission 4 via a transmission belt 19. Further, on the vehicle body 1, a pair of guide rollers 35 are disposed so as to be able to protrude and retract in the same direction as the axis of the drive bearing box 21 before and after the elevating table 11, and to be movable in the vertical direction as necessary. ing. The rotation of the prime mover 14 is transmitted to the drive bearing box 21, and the rotation of the drive bearing box 21 is transmitted to the rear wheel 3 via the transmission 4, the transmission 7, and the differential device 9. The feed is transmitted to the rotary blade 34 via the slide shaft 23, the bevel gear 30, and the blade rotary shaft 29 in this order.
Rotate 4 horizontally. The elevating platform 11 moves up and down together with the tool rest 25 due to the expansion and contraction of the elevating cylinder 13. FIG. 5 is a sectional view showing a steering mechanism for the front wheels 2. The rotation of the steering wheel 50 is transmitted to the steering output shaft 60 via the speed reducer 53, and rotates the pinion gear 65.
The pinion gear 65 meshes with a rack 66 and the rack 6
The connecting rod 68 connected to 6 is moved left and right. Connecting rod 6
8 is a steering lever 70 rotatably supported by a pin 71
To the left and right to steer the front wheels supported by one end of the steering lever 70. In addition, a flexible joint 69 is provided between the connecting rod 68 and the rack 66 in the bending direction, thereby preventing mechanically excessive force from acting. FIG. 6 is a cross-sectional view (view from above) of the speed reducer 53 interposed between the steering wheel 50 and the steering mechanism. The steering shaft 52 of the steering handle 50 is
5 to rotate the gear 56 at a reduced speed. The gear 56 further rotates the other worm gear 58 to further reduce and rotate the gear 59. The gear 59 rotates the pinion gear 65 shown in FIG. As is apparent from FIG. 6, the speed reducer 53 transmits the rotation of the steering handle 50 to the steering output shaft 60, but does not transmit the rotation in the reverse direction due to the characteristics of the worm gears 55 and 58. The steering does not have to be performed at all times during a straight cutting operation. In a state where the front wheels 2 are steered, fixed at a certain steering angle, and a side force is applied, the differential device 9 is not operated in order to maintain the straight running stability of the vehicle body 1, and it is better to perform the differential locking operation by performing the differential lock. it can. FIG. 7 is a sectional view of a differential device 9 provided with a differential lock mechanism for that purpose. The rotation of the input sprocket 8 rotates the input gear 79 and the differential gear 8
1 to rotate the differential case 80. Differential case 8
Inside 0, there are a differential pinion 84 and a differential side gear 83. The differential side gear 83 drives the rear wheel shaft 75 to rotate the rear wheel 3. A shifter disk 86 is provided on the rear wheel shaft 75 so as to be rotatable and slidable. The shifter disk 86 has a shifter groove 87 on its outer periphery and a differential lock pin 88 on its side surface.
The differential lock pin 88 can be engaged with and disengaged from the locking hole 89 of the differential side gear 83. A cylinder 93 is installed above the differential device 9 such that the cylinder rod is extended by a spring 91 in a non-pressure state as shown in the figure. A shifter 90 is fixed to the cylinder rod. The operation of the switching valve 95 causes the cylinder rod to expand and contract, and moves the shifter 90 to the left and right. Since the shifter 90 is slidably engaged with the shifter groove 87 at its tip, the shifter disk 86 is moved left and right. In the state shown in the figure, the cylinder rod is extended and the shifter disk 86 is on the left side,
Are disengaged from the locking holes 89 of the differential side gear 83, and the differential device functions. This state is used for simply moving or cutting the curved concrete structure A. However, during the cutting operation, the cutting reaction force is not obtained as much as when the differential lock is actuated. In addition, the steering wheel operation is appropriately performed so as to travel along the curved surface. When the switching rod 95 is operated to move the cylinder rod so as to be housed in the cylinder, the shifter 9 is moved.
0, the shifter disk 86 and the differential lock pin 88 move rightward, engage with the locking holes 89 of the differential side gear 83, and the differential case 80, the differential side gear 83, and the differential pinion 84 are integrated, so that the differential lock is performed and the differential operation is performed. Will not be performed. In this state, the substantially linear concrete structure A
When used for cutting, good and quick work can be performed for the reasons described above. As described above, a large amount of cooling water flows out to the outside, and the treatment is troublesome. However, according to the present invention, the outflow area can be restricted, and the water can be recovered without flowing out. . In addition, the cutting operation can be performed without providing a temporary material for preventing outflow, so that the efficiency of construction can be improved. Since the cutting device of the present invention uses the side force due to the steering angle of the front wheels as the cutting reaction force, it is not necessary to excavate and backfill the guide groove receiving the cutting reaction force, and to perform the cutting operation efficiently. be able to.

[Brief description of the drawings] FIG. 1 is a cross-sectional view illustrating a cutting method according to the present invention. FIG. 2 is a sectional view of a conventional cutting method. FIG. 3 is a side view of the cutting device according to the embodiment of the present invention. FIG. 4 is an internal plan view of the cutting device according to the embodiment of the present invention. FIG. 5 is a sectional view of a front wheel steering device. FIG. 6 is a cross-sectional view of a speed reducer suitable for a front wheel steering device. FIG. 7 is a cross-sectional view of a differential device for a rear wheel. [Explanation of symbols] A concrete structure 1 Body 11 Lifting platform 25 Tool post 34 rotary blade 50 Steering wheel 53 reducer 6 Thin wall part 7 Temporary objects 9 Differential device

Continuation of front page       (56) References JP-A-6-128906 (JP, A)                 JP-A-58-106064 (JP, A)                 Sakurai Sou and co-author "Reinforcing Concrete"               Practical Demolition Method of Tozo ”February 5, 1980               Issued by Riko Kogyo Co., Ltd. 107 ~               112

Claims (1)

(57) [Claims 1] The cutting depth is set so that the thickness of the concrete wall structure of the elevated road remains several millimeters so that it can be cut off by raising without passing through the cooling water for cutting. A method for removing a concrete wall structure in which a cut is made horizontally by a cutting device having a guide roller for keeping a constant, a concrete wall is pulled up, and a remaining thin wall portion is cut off.