JPH047764B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a method for removing joint sealant necessary for repairing joints formed on asphalt or concrete road surfaces, and a method for implementing the method. The present invention relates to a device suitable for

(Conventional technology and its problems) Road surfaces such as runways at airports are constructed of concrete slabs of a fixed area, and expansion and contraction due to vibration and temperature changes are difficult to propagate between each slab. They are separated from each other by suitable joint materials. A sealing material filling groove of an appropriate width is formed on the road surface side between each slab, and this groove is filled with an asphalt-based, polyurethane-based, or other sealant.

Such damaged areas on the concrete road surface can be repaired through maintenance work carried out at regular intervals, but if the joints between each concrete slab are damaged, the sealant in the joint grooves must be removed. After that, the concrete in the repair area on both sides or one side of the joint groove is chipped using a concrete cutter or hammer drill, and resin mortar is poured to form a new joint groove. It will be repaired by filling the inside with sealant. Of course, there are cases where only the sealant is replaced. In any case, when repairing such a joint part, the old sealant must be removed from within the joint groove.

When removing this sealant, it is first necessary to separate the sealant from both sides of the joint groove, but in the past, the sealant was cut using a cutter with a driven rotating blade at a position close to the side faces of the joint groove. With these conventional methods, dust from the sealant being cut adheres to the rotary blade and solidifies, or the rotary blade comes into contact with the concrete forming the joint grooves and is easily damaged, making it difficult to cut smoothly over a long period of time. Not only is it difficult to continue this process, but the rotary blades have to be replaced frequently, resulting in high operating costs. Also, when using a wet type cutter, you must constantly replenish the water supply.

(Means for Solving the Problems) The present invention proposes a joint sealant removal method capable of solving the conventional problems as described above, and a suitable device for carrying out the method. ,
The method involves inserting a blade plate for breaking the sealant into the side of a groove filled with sealant provided on the concrete road surface, and tilting the blade plate so that its front edge is diagonally rearward and upward with respect to the horizontal traction direction. By pulling it along the side surface of the joint groove in a state slightly inclined with respect to the length direction of the joint groove in plan view, so that the trailing edge approaches the side surface of the joint groove and moves away from the side surface of the joint groove. The feature is that the filling sealant is peeled off from the side of the joint groove, the filling sealant is peeled off in the same manner from the other side of the joint groove, and then the filling sealant is peeled off from the bottom of the joint groove and removed. have

Furthermore, the sealing material removal device according to the present invention is characterized by providing a traction rod that can be raised and lowered at the rear of the towing vehicle and that can be fixed at any height. The blade plate for breaking the sealing material, which has a leading edge, is mounted so as to be slightly inclined with respect to the traveling direction of the towing vehicle when viewed from above.

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

Figures 1 to 8 show the procedure for repairing joints between concrete slabs.
In Fig. 1, 1 and 2 are concrete slabs adjacent to each other, an appropriate joint material 3 is interposed between them, and a joint groove 4 of an appropriate width is provided on the road surface side between them.
is formed, and the joint groove 4 is filled with a sealing material 5.

Now, to explain the case of repairing an area of a constant width on both the left and right sides of the joint groove 4 including the sealant-filled joint groove 4, first, as shown in FIG. Then, cut and separate from both sides 4a and 4b of the joint groove 4,
After peeling off the sealant 5 from the bottom surface 4c of the joint groove 4, as shown in FIG. Deep cuts 6a and 6b are formed using a concrete cutter. Next, as shown in FIG. 4, the concrete between the cuts 6a and 6b is chipped off with a hammer drill to form a repair groove 7 between the concrete slabs 1 and 2.

In the repair groove 7, as shown in FIG. 5, a strip-shaped triggering plate 8 made of a suitable material such as plastic or wood is set at the center of the groove along the longitudinal direction of the groove. The trigger plate 8 is fixed by placing resin mortar 10a on both left and right sides of the trigger plate 8 so that the upper edge 8a of the trigger plate 8 is exposed. The trigger plate 8 is positioned before the resin mortar 10a is cast by nails 9 driven into the bottom of the repair groove 7 alternately on the left and right at appropriate intervals in the length direction, as shown in FIG. This can be done by bending the repair groove 7 in a slight zigzag shape and pinching it from both the left and right sides, but as shown in FIG.
By forming the trigger plate 8 into the repair groove 7,
It is easy to position it in the central position. Next, as shown in Figure 5, there is a groove 1 for fitting the trigger plate in the center of the bottom.
A joint bar 12 is formed over the entire length of the joint bar 1 so that its groove 11 fits into the upper edge 8a of the trigger plate.
Place it on the poured resin mortar 10a, and
As shown in the figure, resin mortar 10b is placed in the spaces left on both the left and right sides of the joint bar 12.

By removing the joint bar 12 after the resin mortar 10a, 10b has hardened, a new joint groove 13 is formed as shown in FIG. 8. After sanding both the left and right sides of this joint groove 13 using a suitable means such as a sander to make it smooth, a backer 14 as a back-up material is laid at the bottom of the joint groove 13 as shown in the figure, and a sealing material is applied on top of it. 15, the repair is completed.

When repairing only one side of the joint groove 4 including the sealant-filled groove 4 shown in FIG. 1, after removing the sealant 5 as described above, the side to be repaired is concrete slab 2
The repair groove 7 is formed only in (or 1) as described above, and the trigger plate 8 is formed in the repair groove 7 as shown in FIG.
What is necessary is just to make it contact with the concrete slab side surface 1a (or 2a) exposed inside, and to erect it. Other operations are performed in the same manner as described above.

The method of the present invention is applied to a method for removing old sealant 5 performed during repair work of joints between concrete slabs as described above. A cutting blade 16 is used. This blade plate 1
6 is made of a flat iron plate or the like of an appropriate thickness, and has a front edge 16a that is inclined rearward and upward at an appropriate angle θ with respect to the horizontal traction direction, and a horizontal bottom edge 16b that comes into contact with the joint groove bottom surface 4c. There is.

This blade plate 16 is inserted into the side of the sealant-filled joint groove 4 shown in FIG. The rear edge 16c is close to the joint groove side surface 4a and the rear edge 16c is close to the joint groove side surface 4a.
The old sealant 5 is peeled off from the side surface 4a of the joint groove by pulling it approximately horizontally in the length direction of the joint groove 4 while being slightly inclined with respect to the length direction of the joint groove in plan view. I can do it. Then, after peeling off the filling sealant 5 from the other joint groove side surface 4b in the same manner,
The filler sealing material 5 may be removed by peeling it off from the joint groove bottom surface 4c.

The front edge 16a of the blade plate 16 has a shape cut at right angles to the side surface of the blade plate as shown in FIG. 13A, a single-edged shape as shown in FIG. 13B, or a recessed shape as shown in FIG. 13C. Although it can be formed into a groove shape, the direction of inclination of the blade plate 16 is reversed when the sealant 5 is peeled off along the joint groove side surface 4a and when the sealant 5 is peeled off along the other side surface 4b. Therefore, the shape shown in FIG. 13A or FIG. 13C is preferable.

Next, an embodiment of a device for towing the blade plate 16 will be described based on FIGS. 14 and 15. This device 17 is equipped with a tow rope locking fitting 18 at the front end and a towing cable locking fitting 18 at the lower rear end. A towing frame 19 to which the blade plate 16 is fixed, this towing frame 19
It consists of a load platform 20 attached to the upper side of the rear end, and a pair of left and right steering wheels 21 provided on both left and right sides of the intermediate position of the frame 19, and each of the steering wheels 21 is provided with a steering lever 22 at the upper end. It is pivotally supported by the lower ends of a pair of left and right vertical steering shafts 23.

The device 17 configured in this manner is attached to the rear of a suitable towing vehicle such as a car, a tiller, or a tractor at an appropriate distance via a tow rope such as a wire rope connected to the tow rope locking fitting 18. With the blade plate 16 inserted into the side of the joint groove as described above, the towing vehicle pulls the blade approximately horizontally along the joint groove at low speed. By sitting on the vehicle while clinging to the top, the worker's weight is applied to the blade plate 16 to prevent the blade plate 16 from lifting up, and at the same time, the operator on board operates the pair of left and right steering levers 22. The direction of movement of the device 17 is slightly tilted toward the side of the joint groove where the leading edge 16a of the blade plate 16 is adjacent to the longitudinal direction of the joint groove.
It can be moved forward so that the front edge 16a of No. 6 is always in sliding contact with one side of the joint groove.

The device 24 shown in FIGS. 16 and 17 includes a traction rod 25, a blade plate support frame 26 connected to the rear end of the traction rod 25, and a blade unit attached to the rear end of the frame 26. It consists of 27. The traction rod 25 is connected to a lifting arm 29 for connecting a working attachment provided at the rear of the tractor 28, a support shaft 30, and a screw shaft 3 for raising and lowering.
1, the blade plate support frame 2
6, a connecting vertical shaft 32 protruding upward from its front end is fitted into a vertical cylindrical shaft 33 fixed to the rear end of the traction rod 25 so as to be able to move up and down and rotate, and is connected by a bolt 34 with a lever. It is connected to the traction rod 25 by fixing it at any height and angle. The blade plate unit 27 has a plurality of blade plates 16 (four in the illustrated example) fixed around a central board 35, and the central board 35 is attached to the rear end of the frame 26. Horizontal support shaft 3
6, and the blade plate is fixed rotatably by one of a plurality of circumferential bolt holes 37 provided in the central board 35 corresponding to each blade plate 16 and a fixing bolt 38 passing through the frame 26. By fixing the unit 27, any one of the plural blade plates 16 in the circumferential direction can be selectively used.

Note that the lifting arm 29 on the tractor 28 side
By vibrating up and down about a support shaft 40 using a lift drive lever 39, its angle with respect to the ground can be adjusted and fixed as desired.

The device 24 constructed as described above and connected as described above to the tractor 28 is connected to the tractor 28.
The device 24 can be held at an appropriate height above the ground by the lifting arm 29 on the 8 side, and in this state, the device 24 can be freely moved by the tractor 28. When removing old sealant from the joint groove, use the blade unit 2.
7, the lifting arm 29 is forcibly lowered by the lifting drive lever 39 with the blade plate 16 located at the downward use position P located directly above the side of the groove. Blade plate 1
6 can be inserted into the groove side to a predetermined depth.

At this time, the tractor 28 is positioned so that its traveling direction is parallel to the longitudinal direction of the groove, but as shown in FIG. The blade plate support frame 26 is moved horizontally with respect to the vertical cylinder shaft 33 on the traction rod 25 side, centering on the vertical shaft 32 for connection, so that it is inclined in a predetermined direction by a predetermined angle with respect to the longitudinal direction of the groove. Adjust the angle and bolt with lever 34
Fix it by. Further, the lifting screw shaft 3 is installed in advance so that when the lifting arm 29 is lowered to a certain position, the blade plate 16 located in the downward use position P as described above is inserted into the joint groove to a predetermined depth.
It is possible to adjust the angle of the traction rod 25 in the vertical direction by the rotation operation of 1, and to adjust the fixed height of the connecting vertical shaft 32 with respect to the vertical cylinder shaft 33 on the side of the traction rod 25.

Once the blade plate 16 in the downward working position P is inserted into the side of the joint groove as described above, the side edge of the old sealant is broken by the blade plate 16 by driving the tractor 28 along the joint groove at low speed. I can do it. And the blade plate 16 used
If the blade plate 16 is worn out beyond a certain amount, bent improperly, or damaged, remove the bolt 38, rotate the blade unit 27 around the spindle 36, and place the new blade plate 16 in the downward use position P. With the blade unit 2 in the position, tighten the bolt 38 again.
7 to the frame 26, the work can be continued with a new blade plate 16.

Multiple types of blade plates with different thicknesses and shapes are fixed to the blade plate unit 27, and the width and depth of the groove to be worked on, the material of the sealant to be removed, etc.
It can also be configured so that the blade plate to be used can be selected depending on the working conditions.

In addition, in the above device 24, if there is a difference between the road surface level where the wheels of the tractor 28 touch the ground and the road surface level at the position of the blade plate 16 inserted into the joint groove, or if the depth of the joint groove changes. In such a case, the insertion depth of the blade plate 16 into the joint groove may vary, and depending on the situation, the blade plate 16 may be unduly pressed against the bottom surface of the joint groove, causing damage to the blade plate 16 or other parts. There is a risk of deformation or damage. In order to eliminate this inconvenience, the blade plate support frame 26 is configured to be able to rise and fall within a certain range with respect to the traction rod 25, and between the two, the frame 26 is moved toward the ground side with respect to the traction rod 25. It is sufficient to interpose a spring that applies pressure.

For example, as shown in FIGS. 18 and 19, the square shaft portion 32a of the connecting vertical shaft 32 on the blade plate support frame 26 side is connected to the cylinder 41 attached to the vertical cylinder shaft 33 on the traction rod 25 side. A spring 42 can be interposed between the blade plate support frame 26 and the cylinder body 41 so as to be able to move up and down within a certain range. The cylinder body 41
is fixed to the vertical cylinder shaft 33 by connecting the fixing plate 43 on the cylinder body 41 side and the fixing plate 44 on the vertical cylinder shaft 33 side with bolts and nuts 45. By making the bolt hole 46 an arc-shaped elongated hole concentric with the cylinder shaft 33, the blade plate support frame 2 can be removed within the range of this elongated hole 46.
6 angle (inclination with respect to the direction of tractor travel) can be adjusted.

In use, the traction rod 25 is connected to the lifting arm 2 so that the spring 42 is properly compressed.
9, the blade plate 16 can be pressed against the inner bottom surface of the joint groove by the compressive reaction force of the spring 42. Therefore, even if the level of the road surface where the wheels of the tractor 28 touch the ground is slightly higher or lower than the road surface level at the position of the blade plate 16, or even if the depth of the joint groove changes slightly, the blade plate 16 will always keep the joint groove in place. It can be moved by sliding into contact with the bottom surface without difficulty.

Incidentally, the bolt holes 46 may not be long holes, but may be provided in parallel at appropriate intervals in the circumferential direction. In this case, even if the bolt/nut 45 loosens to some extent, the inclination of the blade plate support frame 26, that is, the inclination of the blade plate 16 with respect to the tractor traveling direction can be reliably maintained. Further, as shown in FIG. 20, the blade plate support frame 26 is pivotally attached to the lower end of the connecting vertical shaft 32 by a support shaft 47 so as to be able to swing up and down. A shaft rod 48 that restricts the vertical swing range of the frame 26 and a spring 49 that presses and biases the frame 26 toward the ground may be interposed therebetween. In this case, the cylindrical body 41 can be omitted, and the fixing plate 43 can be provided to protrude from the connecting vertical shaft 32 to directly fix the connecting vertical shaft 32 to the vertical cylindrical shaft 33.

(Operations and Effects of the Invention) The method for removing sealant for road joints according to the present invention can be carried out as described above, and according to the method of the present invention, one fixed blade plate is placed in the joint groove. Although this method is extremely simple and easy, just pull the blade almost horizontally, the blade plate is always moved with its front edge in sliding contact with or close to the side of the joint groove, and the old sealant can be removed securely from the side of the joint groove. It can be peeled off. In addition, there is no fear of old sealant or concrete dust being scattered, so you can always work in a good environment, and you can avoid unexpected damage such as damage to the traction blade plate like when using a rotary blade. Since there is almost no risk of the machine becoming unusable, work can be continued efficiently over a long period of time.

In addition, a blade for breaking sealing material with a front edge that is inclined diagonally rearward with respect to the horizontal towing direction is attached to the lower side of the towing frame that is connected to the towing vehicle via a towing cable or the like. A pair of steerable left and right steering wheels are provided on the traction frame so as to be located on both left and right sides in front of the body, and a load platform that can be ridden is further provided on the traction frame at a position above the blade body. When using the device of the present invention, although the sealing material breaking blade can be towed by using an existing general-purpose vehicle such as a car, the weight of the worker riding on the load platform is By the operator's steering operation of the steering wheel, the blade body can be reliably held in a posture suitable for the above-described method of the present invention, and the method of the present invention can be satisfactorily carried out.

Furthermore, a traction rod that can be raised and lowered and fixed at any height is provided at the rear of the towing vehicle (tractor in the example), and this traction rod is provided with a front edge that is inclined diagonally rearward and upward with respect to the horizontal traction direction. When using the device of the present invention, in which the blade plate for breaking the sealant is installed in a state that is slightly inclined with respect to the traveling direction of the towing vehicle in plan view, only the operator of the towing vehicle is required to use the device. Therefore, the method of the present invention described above can be carried out easily, reliably, and efficiently.
It is possible to significantly reduce the cost of removing joint sealant.

[Brief explanation of drawings]

Figures 1 to 5, 7, and 8 are vertical perspective views showing the procedure for repairing joints, Figure 6 is a plan view showing the trigger plate set, and Figures 9 and 1.
Figure 0 is a vertical perspective view showing the working state when repairing only one side of the joint groove, Figure 11 is a side view showing the operating state of the blade plate for breaking the sealant, Figure 12 is a plan view of the same, and Figure 13. A to C are plan views of essential parts showing the shape of the leading edge of the blade plate, FIG. 14 is a side view showing an example of the blade plate traction device, FIG. 15 is the same plan view, and FIG.
Figure 17 is a plan view of the main parts of the device of the present invention using a tractor, Figure 18 is a vertical cross-sectional side view of the main parts showing a modification, and Figure 19 is a cross-sectional plan view of the same.
FIG. 20 is a side view of the main parts showing yet another modification. 4...Seal groove, 5...Sealing material to be removed,
16... Blade plate for breaking sealing material, 19... Traction frame, 20... Load platform, 21... Pair of left and right steering wheels, 22... Steering lever, 25...
Traction rod, 26... Blade plate support frame, 27... Blade plate unit, 28... Tractor, 29... Lifting arm for connecting work attachment, 32...
Vertical shaft for connection, 33... Vertical tube shaft, 39... Lifting drive lever, 41... Cylindrical body, 42, 48... Spring.

Claims (1)

[Scope of Claims] 1. A blade plate for breaking sealant is inserted into the side of a groove filled with sealant provided on a concrete road surface, and the blade plate is inserted so that its front edge is diagonally rearward and upward with respect to the horizontal traction direction. It is approximately horizontal along the side surface of the joint groove with a slight inclination to the length direction of the joint groove in plan view, so that the trailing edge is close to the side surface of the joint groove while being inclined to the side surface of the joint groove. The filler sealant is peeled off from the side of the joint groove by pulling it to the groove, and the filler and sealant is peeled off from the side of the other joint groove in the same manner, and then the filler sealant is peeled off from the bottom of the joint groove. A method for removing a road surface joint sealant, the method comprising: removing a road surface joint sealant; 2. A sealing material breaking blade with a front edge inclined diagonally rearward with respect to the horizontal towing direction is attached to the underside of the towing frame connected to the towing vehicle via a towing cable, etc., and this blade A pair of steerable left and right wheels are provided on the traction frame so as to be located on both sides of the front left and right sides of the traction frame, and a load platform on which a rider can ride is provided on the traction frame at a position above the blade body. Joint sealant removal device. 3 A traction rod that can be raised and lowered at the rear of the towing vehicle and can be fixed at any height is provided, and this traction rod is equipped with a blade plate for breaking the sealant that has a front edge that slopes diagonally rearward and upward with respect to the horizontal traction direction. A road surface joint sealing material removing device, which is installed in a state where it is slightly inclined with respect to the traveling direction of the towing vehicle when viewed from above. 4. A plurality of said sealing material breaking blade plates are provided radially protruding around a base plate which can be rotated and fixed to said traction rod, and by rotating and fixing said base plate, any one of said blade plates in the circumferential direction is provided. The road surface joint sealing material removal device according to claim 3, which is configured so that one can be selectively used. 5. The blade plate for breaking the sealant is attached to a blade support frame that is movable up and down within a certain range with respect to the traction rod, and is provided with a spring that biases the blade support frame downward. The road surface joint sealant removal device according to scope 3.