JPH09189015A - Approach gliding surface servicing device of ski jumping-off platform, groove finishing device of approach gliding surface, approach gliding surface adjusting method and groove finishing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the labor for the service and service an approach gliding surface which is homogeneous and excellent in accuracy by servicing the approach gliding surface while a service machine body traveling on a guide rail is vertically moved by a cable. SOLUTION: A service machine body 4 is traveled on a rail 2 by driving a cable 3 by a winch 19 through a wire rope 3 and pulleys 37, 37 and 38, 38 provided on four corners of the service machine body. The cable 3 is respectively fixed to a mountain side 35 of a jumping platform and a valley side 36, and the slackness of the wire rope 3 is adjusted by a weight 18. Two parallel guide rails 2, 2 are arranged on both sides of the approach gliding surface 1, and the service machine body 4 provided with a rotary cutter 6, a snow removing/pressing plate 5, and a groove shaver holder 8 is loaded on the guide rails 2, 2 through a plurality of wheels 13, and moved for elevation/lowering from the mountain side to the valley side, and then, from the valley side to the mountain side by driving the cable 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an approach slide surface maintenance device for removing snow from the approach slide surface of a ski jumping base to form an approach slide surface, and a groove finishing device for the approach slide surface. The present invention relates to a sliding surface adjusting method and a groove finishing method.

[0002]

2. Description of the Related Art In general, most ski jumps for skiing are of a natural type that utilize the steep slopes of mountains, but in recent years, artificial jumps made of steel frames have also been made. The approach runway of these jumps has a large slope of snow on steep slopes, forming a long slope. For example,
The approach gliding surface alone is usually formed to have a length of 70 to 90 m.

It is indispensable to secure abundant amount of practice in order to improve the record of jump competitions in ski competitions, further update the records, expand and strengthen the athlete base. To this end, it is necessary to always have a fast, safe and reliable approaching surface that is homogeneous and has excellent gliding performance.

[0004] At present, maintenance of the approach runway of the jump base at the time of performing a jump competition, that is, maintenance of the approach runway such as snow removal / compressed snow on the approach runway and grooving of the approach groove is not mechanized. Moreover, despite the work on the steep slopes, it is the current situation that a large number of workers perform the work manually. Therefore, in the maintenance work of the ski competition jump table, a large number of workers wearing non-slip crampons first attached a lifeline and stood on the steep slope of the jump table, and the snow was worked on both sides of the approach runway. , Adjusting the accumulated snow to a certain height and carrying out work to harden the snow to secure the approach runway. Next, the approach groove prepared by the test skier was slipped several times to form the approach groove.

[0005]

As described above, performing the maintenance of the approaching and sliding surface of the jump table manually by manual labor causes the following problems.

[0006] A large number of workers are mobilized for maintenance, a long course is required for maintenance, a lot of labor and time are required, and it is difficult to quickly form an approach planing surface. In addition, since it is done manually, there is a risk of damaging the pre-finished approach runway.

[0007] On a steep slope, a large number of workers work on snow, so that the working environment is poor, and it is difficult to adjust the approach sliding surface with high precision because work is performed in a dangerous situation.

Due to manual work by a large number of workers, the approaching surface cannot be adjusted uniformly, resulting in slight deformation and unevenness in the approaching groove, which may cause vibration and blurring of the ski during skiing, resulting in certainty. And the recording surface was adversely affected. In particular, in manual work, it is difficult to finish the approach runway groove to a constant depth over the entire length of the approach runway.

When the maintenance and modification of the running surface are performed manually, it takes a long time as described above, so that it is not swift and cannot cope with changes in weather conditions. It is an obstacle to the uniformity of the competition conditions.

[0010] As described above, maintenance of the approach runway by a large number of human-ocean tactics requires time and cost, and since it is desired to form a uniform approach runway groove, there is a strong demand for mechanization. It was

That is, in order to further update the jump competition record, expand and strengthen the player class, it is essential to secure an approaching surface having excellent sliding performance and abundant practice amount. It has been pointed out from a number of perspectives that there is a need for equipment that can always ensure a fast, safe and reliable approaching surface.

It has been decided that the maintenance of machinery for the approaching and sliding surface at the time of jump competitions by the International Ski Association is obligatory, and each country is urgently required to respond to this.

Mechanization of approach planing surface maintenance, labor saving,
Resolving issues surrounding the jump stadium, such as speeding up and ensuring maintenance safety, improves the record of jump competitions, increases the amount of practice,
It will bring about the expansion of the bottom.

In view of these circumstances, the inventor of the present invention has previously proposed an approach slide surface maintenance device for a ski jump and an approach slide surface adjustment method (Japanese Patent Application No. 7-72703).
No.) was proposed.

However, it was difficult to form a reliable groove because the cutting snow powder was accumulated in the shoulder portion of the groove when forming the approach sliding groove and the cutting snow powder was accumulated in the corner portion of the groove bottom.

Further, it is preferable that the approach run groove is maintained in a rough snow shape over the entire length as a jumb condition, but it is difficult to manually adjust the finish state of the groove bottom part manually.

In view of the above-mentioned circumstances, the present inventor has improved the Japanese Patent Application No. 7-72703 to provide a groove finishing device and an approaching groove finishing method for an approaching surface of a ski jumping base (Japanese Patent Application No. 7-72703). -292588) was proposed.

However, there are a wide variety of snow qualities such as fresh snow, dry snow, wet snow, and snow in the early spring that has turned into rough snow, and it is desired to uniformly remove and compact the approaching runway with any snow quality.

The present invention has solved the above-mentioned problems, and saves labor for approach sliding surface maintenance by mechanizing the approach sliding surface maintenance without manpower for maintaining the approach sliding surface of the jump platform. An approach slide surface maintenance device and an approach slide groove finishing device that can maintain a uniform and highly accurate approach slide surface regardless of snow quality, speeding up, safety of maintenance work,
The purpose of the present invention is to provide a sliding surface maintenance method and a groove finishing method.

[0020]

According to a first aspect of the present invention, there is provided a ski jump platform approaching and running surface maintenance device which is arranged on guide rails arranged in parallel on both sides of the approaching and running surface of the ski jumping platform along the rail. Cable stretched over the guide rail, the maintenance machine main body running on the guide rail, and the lower end of the maintenance machine main body on the valley side so as to be vertically movable to remove excess snow accumulated on the approach sliding surface and remove the remaining snow. The snow removing and pressing snow plate that pressurizes and flattens the snow on the approach sliding surface, and the approach sliding surface that is mounted on the upper end of the mountain side of the maintenance machine and pressure flattened on the approach sliding surface. A rotary cutter having two approach grooves formed therein; a drive unit mounted on the maintenance machine body for engaging the cable to move the maintenance machine body up and down along the approach slide surface; Comprising a power unit for driving the cutter, servicing the approach sliding surface while vertically moving the maintenance machine main body by the cable.

According to a second aspect of the present invention, there is provided a method for preparing an approaching and running surface of a ski jumping table, in which guide rails are provided on both sides of the approaching and running surface of the ski jumping table, and the approaching and sliding surface of the ski jumping table is placed on the guide rails. On the surface, a snow removal and compression plate that removes excess snow on the running surface and pressurizes and flattens the snow on the remaining running surface, and two ski run grooves on the pressed and flattened snow surface. When running the maintenance device equipped with a rotary cutter to be formed and lowering the approach sliding surface from the mountain side to the valley side, the snow removing plate is lowered and the rotary cutter is raised to raise the snow on the approach sliding surface. Is removed and pressed, and the skid groove is formed on the depressurized snow surface by raising the depressurizing and pressing snow plate and lowering the rotary cutter at the time of ascent.

According to a third aspect of the present invention, there is provided a groove finishing device for an approaching surface of a ski jumping table, which is stretched along guide rails arranged in parallel on both sides of the approaching surface of the ski jumping table. Cable, the maintenance machine main body running on the guide rail, and the bottom end of the maintenance machine main body that is vertically movable and removes excess snow on the approach runway while remaining on the approach runway. Depressurized snow plate for pressurizing and flattening snow, and the approach slide surface mounted on the upper end of the mountain side of the maintenance machine for pressure flattening. Two approach grooves parallel to the snow surface. An approach planing surface maintenance device equipped with a rotary cutter that is formed, and that maintains the approach planing surface while moving the maintenance machine body up and down with a cable. , A groove shaver holder that is attached to the lower end side of the maintenance machine body so that it can move up and down, and is wider than the rotary cutter-shaped groove and formed in a warp shape, and a rotary cutter-shaped groove that is fixed to the lower surface of the groove shaver holder It is characterized by comprising a groove shaver in which a contact surface with snow having the same width is engraved in a lattice shape and formed in a sawtooth cross section.

According to a fourth aspect of the present invention, there is provided a method of finishing a groove on an approaching and running surface of a ski jumping table, in which two parallel guide rails are arranged on both sides of the approaching and running surface of the ski jumping table and a rotary cutter is provided on the guide rail. When the cable is used to drive the maintenance machine body equipped with the removal and compression snow plate and the groove shaver holder, the removal and compression snow plate located on the lower end side of the maintenance machine body is lowered and the rotary cutter and the lower end portion of the upper end portion are moved down. After positioning the maintenance machine main body on the mountain side summit of the ski jump stand with the groove shaver holder raised,
While lowering the maintenance machine main unit along the guide rail along the approach slide surface of the ski jump platform, remove excess snow on the approach slide surface on both sides of the approach slide surface and press the remaining snow on the slide surface. When the maintenance machine body reaches the lower end of the approach runway valley side while flattening, lowering the snow removal plate at the lower end of the maintenance machine body and raising the rotating cutter and lower end of the upper end. Lower the groove shaver holder and reversely drive the guide rope to drive the rotary cutter to cut the approach groove along the approach slide surface.Then, form the groove of the rotary cutter with the groove shaver holder to make the groove shoulder. And the bottom of the groove is pressed with snow, and the bottom of the approach groove is finished with a groove shaver in the shape of rough snow.

According to the present invention, the main body of the maintenance machine is thus positioned on the mountain-side summit of the ski jumping table, and the snow removing / snowboard mounted on the lower end side of the main body of the maintenance machine is lowered, along the guide rails. By driving the cable and lowering the maintenance machine body to the valley side, the snow on the approach runway is removed from above, the height of the snow surface is adjusted evenly, and it is pressed together to a uniform hardness. Surface finish.

At this time, when the maintenance machine body is lowered to the valley side, the cutting edge 5b at the lower end edge of the removing / compacting snow plate 5 and the pressing plate 5c are changed by changing the angle of the removing / compacting snow plate 5.
With this function, it is possible to uniformly remove and compress snow regardless of the quality of the snow, such as fresh snow, dry snow, wet snow, or snow in the early spring that turned into rough snow.

Further, by lowering the rotary cutter of the maintenance machine main body, it is parallel to the approach runway from the valley side to the mountain side.
Sequentially form the approach groove of the book.

Further, when the main body of the maintenance machine is raised from the valley side to the mountain side, the rotary cutter and the groove shaver holder are lowered, and the groove cut by the rotary cutter is moved to the groove side surface by the groove shaver holder and the groove shaver. By pressing and rounding the groove shoulders, the corners of the groove bottom are made flat and the groove bottom is finished in a rough snow shape.

Furthermore, when the maintenance machine body is raised from the valley side to the mountain side, the snow removing plates in front of and behind the wheels of the maintenance machine body are lowered to remove the remaining snow generated during the rotary cutter grooving, and the groove shaver. The accuracy of the sliding groove 7 is improved by pressure-compacting the groove side surface and the groove upper end of the holder and the groove shaver and finishing the groove bottom into a rough snow shape.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing an embodiment. FIG. 1 is a perspective view showing the entire approach and runway maintenance device for a ski jump base according to the present invention, FIG. 2 is a perspective view of the approach and runway maintenance device according to the present invention, and FIG. 3 is a view of the approach and runway maintenance device according to the present invention. FIG. 4 is a partially cutaway perspective view, FIG. 4 is a top view of the approaching and sliding surface maintenance device of the present invention, FIG. 5 is a top view of the approaching and sliding surface maintenance device of the present invention, and FIG. 7 is an explanatory view showing a change of the pressed snow plate, FIG. 8 is a side view of the approach groove finishing device of the present invention, FIG. 9 is a partially cutaway front view of the approach groove finishing device of the present invention, and FIG. 10 is a groove of the present invention. The bottom view of the shaver holder and the groove shaver, FIG. 11 is an enlarged perspective view of the bottom surface of the groove shaver of this invention, FIG. 12 is AA of FIG.
FIG. 13 is an enlarged sectional view taken along the line, and FIG. 13 is an explanatory view of the approach groove of the present invention. (A) a state diagram before groove finishing, (b) a state diagram of groove finishing, and (a) a groove state diagram after groove finishing. is there.

As shown in FIG. 1, the approach skiing surface maintenance device for a ski jump base of the present invention is mounted on a pair of guide rails 2, 2 arranged in parallel on both sides of the approach skiing surface 1 of the ski jump ski. By the cable 3 stretched along the rails 2 and 2, the maintenance machine body 4 is moved up and down along the approach runway 1 from the mountain side to the valley side, and further from the valley side to the mountain side. The maintenance of snow removal, pressure snow, approach grooving, etc. will be performed.

In this maintenance machine body 4, there are a snow removing and pressing plate 5 for pressurizing and flattening the snow on the approach sliding surface 1, and a rotary cutter 6 for forming two approach grooves 7 on the approach sliding surface 1. , The direction of travel is on the same line as the rotary cutter 6, and the approach groove 7 formed by the rotary cutter 6 is pressed to round the shoulders of the groove 7 to flatten the corners of the groove 7 and the bottom of the groove. It is composed of a groove shaver holder 8 and a groove shaver 9 for finishing the rough snow. In the figure, 16 is a pulley expansion / contraction device provided on the valley side, 17 is a winch, and 18 is a cable 3.
, 19 is a drive device for the cable 3, 20 is a guide pulley for the cable 3, 21 is a storage base of the maintenance machine body 4 provided on the mountain side, and 22 is an emergency winch.

As shown in FIGS. 2 to 5, the maintenance machine body 4 of the embodiment has wheels 13, 13, 13 and 13 on a pair of parallel guide rails 2 and 2 on both sides of the approach sliding surface 1 through wheels 13. It is placed on the guide rails 2, 2. This maintenance machine body 4
At the lower end of the valley side, a snow removal / compression plate 5 for removing excess snow on the approach runway 1 and pressurizing and flattening the snow on the remaining runway 1 is vertically movable. .
The angle of the snow removing and pressing snow plate 5 can be adjusted by the angle adjusting device 40 according to the quality of snow and the like. Further, a rotary cutter 6 forming two approach grooves 7 parallel to the pressure-flattened snow surface, that is, the approach sliding surface 1, is arranged at the upper end of the mountain side of the maintenance machine body 4 so as to be vertically movable. ing. Then, at the lower end of the maintenance machine main body 4, on the back side of the snow removing and pressing plate 5, the traveling direction is aligned with the rotary cutter 6, and the lower surface is formed in a lattice shape with a sawtooth cross section. Grooved shaver 9
The groove shaver holder 8 to which is fixed is attached. In the maintenance machine main body 4 of the embodiment configured as described above, the drive device 19 of the cable 3 drives the guide rails 2 and 2 to move up and down the mountain side and the valley side along the approach running surface 1 to approach the approach running surface. 1 and the approach groove 7 are formed. In FIG. 2, 37 and 38 are pulleys of the cable 3 which are mounted on the maintenance machine body 4.

As shown in FIGS. 2 to 7, the snow removing and pressing snow plate 5 of this embodiment is arranged on the valley side of the lower end of the maintenance machine body 4 and is composed of a blade 5a, a cutting edge 5b and a holding plate 5c. Remove snow from approach runway 1. The removing and pressing snow plate 5 is attached to the maintenance machine body 4 via the lift bracket 50.
The lift guide 10a is mounted so as to be vertically movable.
That is, the removing and pressing snow plate 5 is removed from the upper plate 51 and the lower plate 52 which are fixed to the lift bracket 50.
It is attached by an upper guide 53 and a lower guide 54 that are fixed to the back surface of the pressure snow plate 5. The fulcrum pin 55 of the lower plate 52 and the lower guide 54 serves as a fulcrum to adjust the angle.
The upper plate 51 is provided with a plurality of insertion holes 51a for changing the angle. By changing the insertion holes 51a, the angle of the snow removing and pressing snow plate 5 is changed.

The removing / compacting snow plate 5 having the above-mentioned structure
A blade 5a which is mounted on the lower end of the maintenance machine body 4 on the valley side and removes snow on the approach runway 1 from the mountain side to the valley side, and a cutting edge for removing snow on the approach runway 1 on the lower edge of the blade 5a. 5b and a pressing plate 5c having a gentle curved surface behind the cutting edge 5b are integrally arranged. The width of the blade 5a is excluded
It is formed wider than the width of the two guide rails 2 and 2 so that the pressure snow can be made uniform. As a result, the snow on the approach sliding surface 1 is pushed out by the blade 5a, and the approach sliding surface descends while being cut to a certain height by the cutting edge 5b of the blade 5a. Then, the curved surface of the pressing plate 5c behind the cutting edge 5b presses the snow surface to harden the snow on the approaching sliding surface 1.

The snow-removing / compacting snow plate 5 according to this embodiment may be fixed, but the snow on the approach runway 1 is fresh snow,
Since the snow quality is not the same, such as dry snow, wet snow, or snow in the early spring that has turned into rough snow, the angle of the snow-removing plate 5 is changed by the angle adjusting device 40 in order to uniformly remove and compress the snow. As a result, the snow removal / compression plate 5 can be adjusted for all types of snow.

That is, as shown in FIG. 6, the angle adjusting device 40 is rotatably attached to the lift blanket 50 by the link pin 55 on the valley side of the lower end portion of the maintenance machine body 4, and the lower end edge of the snow removing and pressing plate 5 is attached. A cutting edge 5b is integrally attached to the portion, and a holding plate 5c which is a pressed snow structure is integrally attached to the rear portion. An upper plate 51 for adjusting the mounting angle of the removing / compacting snow plate 5 is attached to the upper part of the removing / compacting snow plate 5, and a blanket 56 for adjusting the angle is attached to the lower play and 52, and several pin insertion holes are provided. By inserting the pin 57 into the 51a, the mounting angle of the snow removing / snowboard 5 can be changed. Pin 5
Since it is fixed at 7, it is stable, and by changing the pin insertion hole 51a, it can be set at an arbitrary angle. Also, adjustment of the angle,
The same applies to a structure in which the angle is changed steplessly by using a hydraulic jack or a turnbuckle.

The angle of the removing / compacting snow plate 5 is freely changed by changing the position of the stopper pin insertion hole 51a in accordance with the change of the snow quality. For example, as shown in FIG. 7A, in the case of rough snow in the early spring, the stopper pin insertion hole 51a is located on the outer side, and the cutting edge 5b is set to suppress the snow pressure. In addition, as shown in FIG. 7B, in the case of fresh snow and ice burn, the position of the stopper pin insertion hole 47 is set to the inner side and the snow pressure is applied.

The lifting and lowering of the snow removing and pressing snow plate 5 is performed by the lifting device 10 of the maintenance machine body 4. The lifting device 10 is a lift bracket 5.
0, a roller 10b provided on a lift guide 10a for moving up and down, a chain 10c, a lift jack 1
It is composed of 0d and a handle 10e. In this way, the lifting device 10 is attached to the lower end valley side of the maintenance machine body 1. By turning the handle 9a, the snow removing and pressing snow plate 5 moves up and down to adjust the height. Removing and pressing snow plate 5 as well as blade 5
The angle of “a” is changed by the distance adjusting device 40, and the approach runway 1 is adjusted with high accuracy according to the snow quality.

The rotary cutters 6, 6 of the embodiment have two rotary teeth 6 which form an approach groove 7 on the approach sliding surface 1.
It comprises a power unit 8 for driving d, 6d, ... And an elevating unit 11 for integrally raising and lowering them. The rotary cutters 6, 6 are lift guides 6 that are erected on the maintenance machine body 4.
a and the roller 6 mounted on the lift guide 6a
b, chain 6c, lift jack 6f, handle 6
It is attached to the upper end mountain side of the maintenance machine body 4 via an elevating device 11 composed of g. The rotary cutter 6 is moved up and down by the elevating device 11, and the drive device 8 is driven to form two parallel approach grooves 7 for groove cutting on the approach sliding surface 1. In this way, the depth of the approach groove 7 is adjusted by adjusting the lifting device 11, and the groove cutting is adjusted by the power device 8.

The rotary cutters 6, 6 are connected to the power unit 8 through the speed reducer 15 to rotate the cutter teeth 6d (in the direction of the arrow).
The approach groove 7 is cut by slicing. The cutting snow powder generated by driving the rotary cutter 6 is stored in a tray 16 attached to the back surface of the rotary cutter 6. Tray 16
Is for preventing unwanted cutting snow powder after cutting by the rotary cutter 6 from entering the approach groove 7.

The finish of the approach groove 7 of the embodiment is shown in FIG.
As shown in, the rotating cutter 6 and the traveling direction are on the same line,
A groove shaver holder 8 is attached to the lower end side of the maintenance machine body 4 so as to be vertically movable, is wider than the approach groove 7 formed with the rotary cutters 6, 6, and is formed in a warp shape, and a lower surface of the groove shaver holder 8. The groove shaver 9 is detachably attached. The groove shaver holder 8 and the groove shaver 9 are fixed to the lower surface of the groove shaver holder 8 and have a substantially same width as the forming grooves 7 of the rotary cutters 6 and 6 in which a contact surface with snow is engraved in a lattice shape. The groove shaver 9 formed in a shape is fixed. In the figure, 12c is a lift chain, 12d is a roller,
12e is a link bracket, 12f is a link, 12g is a link bar, 12h is a universal rod, 12i is a worm, 12j is a bolt for fixing the groove shaver 9 to the groove shaver holder 8, and 12k is a groove shaver holder 8 and a groove shaver 9. 3 shows a snow plate that receives snow powder generated by pressing and rubbing.

The groove shaver holder 8 is fixed to the lift bracket 50 of the maintenance machine body 4 on the back surface of the snow removing plate 5,
It is attached to the link bracket 12e through the link 12f. This groove finish maintenance is performed by the handle 12b connected to the link 12f by the reducer, the universal rod 1
The position of the groove shaver holder 8 is changed and pressed through 2h, the link lever 12g, and the link lot 12a. Also,
The groove depth is adjusted by changing the thickness of the groove shaver 9. When not finishing the groove, the device is pulled up from the snow surface of the cut surface of the snow removing plate 5 to a position that does not affect snowfall by operating the handle 12b via the link 12f. The warp-shaped die groove is replaced by the groove shaver holder 8 and the bolt 12i. In this finishing device, the groove shaver holder 8 is swingably attached via a link 12f to cope with a change in the curvature of the approach surface 1.

The snow removing / compressing plate 5, the rotary cutter 6, and the groove shaver holder 8 are vertically moved by providing elevating devices 10, 11, 12 for elevating and lowering the approach sliding surface 1. The lifting device 10 for raising and lowering the removing and pressing snow plate 5 mounts a guide plate 5b of a lift jack on the back surface of the removing and pressing snow plate 5, and a handle 9a.
Rotate to move the lift jack 50 up and down to adjust the vertical movement and height of the snow removing and removing plate 5. The removing and pressing snow plate 5 is changed in angle by an angle adjusting device. Further, the lifting device 11 for raising and lowering the rotary cutters 6, 6 is equipped with a lift jack 10a for moving the rotary cutters 6, 6 up and down, and the handle 10b is rotated to raise and lower the lift jig 10a to rotate the rotary cutter 6,
Adjust the vertical movement of 6 and the groove depth for grooving. Further, an elevating device 12 for elevating the groove shaver holder 8 is equipped with a lift rod 12a for vertically moving the groove shaver holder 8, and a handle 12b is rotated to vertically move the lift rod 12a to vertically move the groove shaver holder 8 and the groove. Adjust the pressure.

The maintenance machine body 4 includes wheels 13, 13, 13,
At 13, the cable 3 is driven on the guide rails 2 and 2 to move from the mountain side to the valley side and from the valley side to the mountain side. Before and after the wheels 13, 13, 13, 13, snow removing plates 31, 31, 31, 31 for removing snow on the guide rails 2, 2.
Are arranged respectively. When the remaining snow or cutting snow powder remains on the guide rails 2 and 2, a step is formed in the approach grooves 7 and 7, and the approach sliding groove 7 cannot be formed uniformly. That is, if the guide rails 2 and 2 become uneven due to the remaining snow, the groove depth and the groove finish by the rotary cutter 6 will not be uniform over the entire length, and the accuracy of groove formation will be reduced. The remaining snow on the top is removed as much as possible.

Next, the method of finishing the groove on the approaching and sliding surface of the ski jump base according to the present invention will be described together with its operation.

Running on the rail 2 of the maintenance machine body 4 is shown in FIG.
As shown in FIG. 3, the arranged wire rope 3 and the pulleys 37, 37 and the pulley 3 provided at the four corners of the maintenance machine body 4 are arranged.
This is performed by driving the cable 3 by the winch 19 via the Nos. 8 and 38. Cable 3 is Jumbu Taiyama side 35
And the slack of the wire rope 3 is adjusted by the weights 18, which are fixed to the jumbe valley side 36, respectively.

Two parallel guide rails 2 and 2 are arranged on both sides of the approach slide surface 1 of the ski jump table, and a rotary cutter 6, a snow removing plate 5, and a groove shaver holder 8 are provided on the guide rails 2 and 2. A maintenance machine body 4 equipped with a wheel 1
It mounts via 3, 13, 13, 13. By driving the cable 3, the maintenance machine main body 4 is moved from the mountain side to the valley side and from the valley side to the mountain side to move up and down. Ski down the maintenance machine body 4 while lowering the snow removing and pressing snow plate 5 arranged on the valley side of the lower end portion of the maintenance machine body 4, and raising the rotary cutter 6 on the mountain side on the upper end portion and the groove shaver holder 8 on the lower end portion. It is located on the mountain top of the jump platform.

The position of the stopper pin insertion holes 51a, 51a ... Is selected and changed in accordance with the change in snow quality by changing the angle of the snow removing / pressing plate 5. For example, as shown in FIG. 7A, in the case of rough snow in the early spring, the stopper pin insertion hole 47 is located outside, and the cutting edge 5b is set to keep the snow pressure low. And as shown in FIG. 7 (b),
In the case of fresh snow and ice burn, the position of the stopper pin insertion hole 47 is set to the inner side so that the pressed snow force is applied. In this state, the maintenance machine main body 4 is guided along the approach slide surface 1 of the ski jump stand by the guide rails 2,
While extruding and cutting excess snow on the sliding surface 1 while descending along 2, while removing snow from the approach sliding surface 1 and pressing and flattening the snow on the remaining sliding surface 1 with the pressing plate 5c. Approach down to the valley side of Runway 1. The descending speed of the maintenance machine body 4 is preferably about 3 to 10 m / min, preferably about 4 to 7.5 m / min.

When the maintenance machine body 4 reaches the valley-side lower end portion of the approach skiing surface 1 of the ski jump table, the maintenance-machine body 4 lower-end side valley-side removing and pressing snow plate 5 is raised and the upper-end mountain side The rotary cutter 6 and the groove shaver holder 8 on the lower end valley side are lowered. When the cable 3 is reversely driven by the drive device 19 in this state, the maintenance machine main body 4 slowly rises along the guide rails 2 and 2, and the rotary cutter 6 cuts the approach groove to form the approach groove 7. Then, the groove 7 formed with the rotary cutter is subjected to the snow compression molding of the groove side surface and the groove upper end with the groove shaver holder 8, and the approach groove bottom 7c is finished with the groove shaver 13 in a rough shape.

Approach groove 7 formed by the rotary cutter 6
The cutting snow powder is removed by the holder 16 and the snow removing plate 31, but as shown in FIG. 13A, the remaining cutting snow powder is left in the formed approach groove 7 in the groove shoulder 7a and the groove corner portion. It is left as 7b. Also, the bottom 7 of the shaped approach groove 7
c is not always good as the approach groove 7. Therefore, as shown in FIG. 13B, the direction of travel is on the same line as that of the rotary cutter 6, and on the lower end side of the maintenance machine body 4 is wider than the approach groove 7 in which the rotary cutter 6 is formed, and is warped. Groove shaver holder 8 formed, and groove shaver holder 8
With the groove shaver 9 that is detachably attached to the lower surface of the
The groove corners 7b are pressed to round the groove shoulders 7a to flatten the corners 7b of the groove 7. The snow powder generated by the pressing and rubbing of the groove shaver holder 8 and the groove shaver 9 is the snow removing plate 12.
Received at k. As shown in FIG. 13 (c), the groove shaver 9 is formed by engraving a lattice sintered body on the contact surface with the groove bottom 7 c in a sawtooth cross section, and rubbing while pressing the groove bottom 7 c.
Finish c like snow. Maintenance machine body 4 for grooving
The ascending speed is slower than the descending speed, about 2-6m / min,
It is preferably about 3 to 4 m / min.

The interval between the groove shaver holders 8 is standardized to a certain width for competitions, but can be changed and adjusted appropriately according to the age group such as junior and senior.

In this way, since the shaped groove 7 of the rotary cutter 6 is finished by the groove shaver holder 8 to which the groove shaver 9 is attached, the strength of the side surface of the approach groove 7 is ensured and the falling ski which cannot be performed by the conventional manual work. It is possible to form a groove cross-sectional shape that facilitates restoration of the groove. Further approach groove bottom 7c
Since a grid-sintered body was engraved on the grid-sintered body and pressed by a groove shaver 9 having a sawtooth-shaped cross section to form a rough snow-like shape, the sliding performance was further improved. These have made it possible to reduce the adverse effects on skiing, vibration, derailment, poor sliding performance, etc. during skiing. Further, the groove finishing work of the embodiment is carried out at the same time as the maintenance work of the approach gliding surface 1, so that the working time required only for the groove finishing is substantially unnecessary.

[0053]

According to the groove finishing device and the groove finishing method for the approaching surface of the ski jump base of the present invention, a great deal of labor and time are required for the maintenance of the approaching surface 1 and the maintenance of the running groove. The approach runway 1 can be maintained quickly and accurately.

When lowering the maintenance machine body to the valley side, remove
By changing the angle of the pressure snow plate, the approach runway 1 can be uniformly removed and pressed under any snow quality, such as fresh snow, dry snow, wet snow, or rough snow in early spring.

Further, by cutting the groove of the rotary cutter, it is possible to form a uniform, constant and stable sliding groove over the entire line of the plough sliding groove. Moreover, it is possible to form an approach sliding groove having excellent straightness and levelness with a high precision, with a uniform approach sliding surface and a uniform depth with a small number of people in a short time (2 people for 2 hours).

Further, since the groove shaver holder is attached after the groove cutting, it is possible to form the groove cross-sectional shape which secures the strength of the side surface of the approach sliding groove and facilitates the restoration of the falling ski, which cannot be done by the conventional manual work. It has become possible.

Furthermore, the groove shaver together with the groove shaver formed the rough snow shape on the bottom of the approach sliding groove, so that the sliding performance was improved.

By these means, it is possible to reduce the adverse effects on the recording due to ski shake, vibration, derailment, poor gliding during competition. Further, since this work is carried out at the same time as the maintenance work of the approach sliding surface 1, the working time required only for the groove finishing is substantially unnecessary.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an approaching and running surface maintenance device for a ski jump base according to the present invention.

FIG. 2 is a perspective view of an approach planing surface maintenance device of the present invention.

FIG. 3 is a partially cutaway perspective view of an approach planing surface maintenance device of the present invention.

FIG. 4 is a top view of an approach planing surface maintenance device of the present invention.

FIG. 5 is a top view of the approach planing surface maintenance device of the present invention.

FIG. 6 is a side view of the pressure / snow removing plate of the present invention.

FIG. 7 is a side view showing changes in the pressure / snow removing plate of the present invention.

FIG. 8 is a side view of the approach groove finishing device of the present invention.

FIG. 9 is a partially cutaway front view of the approach groove finishing device of the present invention.

FIG. 10 is a bottom view of the groove shaver holder and the groove shaver of the present invention.

FIG. 11 is an enlarged perspective view of the bottom surface of the groove shaver of the present invention.

12 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 13 is an explanatory view of an approach groove of the present invention, (a) a state diagram before groove finishing, (b) a situation diagram of groove finishing, and (c) a groove state diagram after groove finishing.

Claims (15)

[Claims] 1. A cable stretched along guide rails arranged in parallel on both sides of an approach slide surface of a ski jump base, a maintenance machine body traveling on the guide rails, It is mounted on the lower end of the maintenance machine body so that it can move up and down, and removes excess snow on the approach runway while flattening the remaining snow on the approach runway under pressure.
A pressure snow plate, and a rotary cutter that is mounted on the mountain-side upper end of the maintenance machine body and has two approach grooves formed in parallel with each other on the approach slide surface snow surface that is pressure-flattened on the approach slide surface, A maintenance device is mounted on the maintenance machine body, and includes a drive device that engages with the cable to move the maintenance machine body up and down along the approach slide surface, and a power device that drives the rotary cutter. An approach slide surface maintenance device for maintaining the approach slide surface while moving the machine body up and down. 2. The removing / compacting snow plate has a cutting edge and a holding plate attached to a lower end edge thereof, and an angle adjusting device for adjusting a pressing force of the cutting edge and the holding plate by changing an angle of the removing / compacting snow plate. The approach running surface maintenance device for a ski jump base according to claim 1, which is provided. 3. The ski jump table according to claim 1, wherein the snow removing and pressing snow plate and the rotary cutter are provided with an elevating device that ascends and descends with respect to an approach sliding surface. Approach gliding surface maintenance device. 4. The ski jump according to claim 1, further comprising a snow removing plate arranged before and after a wheel of the maintenance machine body for removing snow on the guide rail. Stand approaching surface maintenance device. 5. A ski is provided with guide rails on both sides of the approaching surface of the ski jumping platform, and the approaching running surface of the ski jumping platform is provided on the guide rails to remove excess snow on the gliding surface. Running a maintenance device equipped with a snow removing and pressing plate for pressurizing and flattening snow on the remaining running surface and a rotary cutter for forming two ski sliding grooves on the pressurized and flattened snow surface, When descending the approach runway from the mountain side to the valley side, the snow removal plate is lowered and the rotary cutter is lifted to remove the snow on the approach runway, and when the snow is lifted, the snow removal plate is removed. A method for preparing an approaching and running surface of a ski jumping base, characterized by forming a skiing groove on a depressurized snow surface by raising and lowering a rotary cutter. 6. The method of maintaining an approaching and running surface of a ski jumping platform according to claim 5, wherein the pressing of the cutting edge and the pressing plate is adjusted by changing the angle of the snow removing and pressing snow plate. 7. A cable stretched along guide rails arranged in parallel on both sides of an approach slide surface of a ski jump base, a maintenance machine main body running on the guide rails, It is mounted on the lower end of the maintenance machine body so that it can move up and down, and removes excess snow on the approach runway while flattening the remaining snow on the approach runway under pressure.
A pressure snow plate, and a rotary cutter that is mounted on the upper end of the mountain side of the maintenance machine body and has two approach grooves formed in parallel with each other on the approach slide surface snow surface that is pressure-flattened on the approach slide surface. An approach-sliding surface maintenance device for maintaining the approach-sliding surface while moving the maintenance-machine main body up and down by the cable, wherein the approaching direction is on the same line as the rotary cutter, and is located on the lower end side of the maintenance-machine main body. A groove shaver holder that is vertically movable and is wider than the rotary cutter-shaped groove and formed in a warp shape; and a snow shaver that is fixed to the lower surface of the groove shaver holder and has substantially the same width as the rotary cutter-shaped groove. A groove finishing device for an approaching and sliding surface of a ski jump table, which comprises a groove shaver in which a contact surface is engraved in a lattice shape and has a sawtooth cross section. 8. The ski jump base according to claim 7, wherein the groove shaver holder is vertically movably attached to a lower end portion of the maintenance machine main body between the maintenance machine main body and the snow removing and pressing snow plate. Approach finishing groove finishing device. 9. The snow removing / compacting plate, the rotary cutter, and the groove shaver holder each include an elevating device that moves up and down with respect to the approach gliding surface and the snow surface. A device for finishing a groove on an approaching surface of a ski jumping platform according to item 1. 10. The maintenance machine main body moves on guide rails by wheels, and snow removing plates for removing snow on the rails are arranged in front of and behind the wheels. The groove finishing device for the approaching and sliding surface of the ski jump table according to any one of claims 1 to 4. 11. The snow removing / compacting snow plate is provided with a cutting edge and a holding plate at a lower end edge thereof, and is provided with an adjusting device for adjusting a pressing force between the cutting edge and the holding plate by changing an angle of the removing / compacting snow plate. The approach and runway maintenance device for a ski jump platform according to any one of claims 7-10. 12. The removing / compacting snow plate has a cutting edge and a holding plate attached to a lower end edge thereof, and an angle adjusting device for adjusting the pressing of the cutting edge and the holding plate by changing an angle of the removing / compacting snow plate. The approach running surface maintenance device for a ski jump platform according to any one of claims 7 to 11, characterized in that it is provided. 13. A maintenance machine main body comprising two parallel guide rails arranged on both sides of an approaching surface of a ski jump table, and having a rotary cutter, a snow removing plate, and a groove shaver holder on the guide rails. When driving with a cable, the maintenance is performed in a state in which the snow removal / compression plate arranged on the lower end side of the maintenance machine body is lowered and the rotary cutter at the upper end and the groove shaver holder at the lower end are raised. After locating the machine body on the mountain side summit of the ski jump platform, lower the maintenance machine body along the guide rail along the approach slide surface of the ski jump platform while removing excess snow on the approach slide surface. While removing the snow and flattening the snow on the remaining runway, it is lowered to the valley side of the approach runway, and the maintenance machine body runs on the approach runway. When it reaches the bottom end on the valley side, the removal and compression snow plate at the lower end of the maintenance machine body is raised, the rotary cutter at the upper end and the groove shaver holder at the lower end are lowered, and the guide rope is driven in reverse. Driving the rotary cutter performs an approach groove cutting along the approach sliding surface, and subsequently, the forming groove of the rotary cutter is pressed snow-shaped at the groove shoulder portion and the groove bottom corner with the groove shaver holder and the approach groove bottom portion is formed. A method of finishing grooves on the approaching and running surface of a ski jump, which is characterized by finishing grooves in a snow shape using a groove shaver. 14. The snow removing plates at the front and rear of the wheel of the maintenance machine main body remove the remaining snow in the rotary cutter-shaped groove while finishing the groove with a groove shaver holder and a groove shaver. Approach of ski jump platform Finishing method of groove on running surface. 15. The approach running surface maintenance of a ski jumping platform according to claim 11, wherein the pressing of the cutting edge and the pressing plate is adjusted by changing the angle of the snow removing and pressing snow plate. Method.