JP6524400B2 - Deck plate drilling bit and deck plate drilling method - Google Patents

Description

  The present invention relates to a deck plate drilling bit and a deck plate drilling method for removing holes by drilling a deck plate portion located inside a void tube.

  Generally, when constructing a floor in a concrete structure such as a building, a metal deck plate is installed and concrete is cast thereon. In addition, since it is necessary to penetrate piping and wiring up and down, a void tube made of paper is usually raised above the deck plate, concrete is cast around this void tube, and concrete is solidified. In this case, drilling is performed to remove the deck plate portion located inside the void tube, and then the void tube is removed. By the way, such a drilling operation is a serious operation for directly drilling a metal deck plate on site. For this reason, a dedicated device for drilling a deck plate has also been proposed.

  DESCRIPTION OF RELATED ART Conventionally, the deck plate cutting device disclosed by patent document 1 is known as an exclusive device for the purpose of the drilling of a deck plate. This deck plate cutting device aims to provide a cutting device capable of opening a through hole from the sleeve (void tube) side, and as a specific configuration, it is provided on a deck plate stretched on a deck receiving beam. A driving device for rotating and elevating a stem in a deck plate cutting device for cutting a deck plate of a portion provided with a sleeve after disposing a sleeve having a predetermined diameter at a planned installation position of a piping hole for piping and casting concrete. And a fixing jig for holding the driving device in the radial center of the sleeve, and a cutter attached to the lower end of the stem and rotationally driven and moved up and down along the inner surface of the sleeve by the driving device. It is a thing.

JP 7-133331 A

  However, the conventional deck plate cutting device disclosed in Patent Document 1 described above has the following problems.

  First, since the apparatus is configured as a dedicated apparatus, the entire structure of the apparatus is likely to be complicated and enlarged, and the number of parts is increased and the number of manufacturing processes is increased. Therefore, the initial cost is greatly increased, the cost of the apparatus can not be avoided, and since the cutter is used as a cutting method, the running cost can not be ignored because the wear is severe and frequent replacement is required. In addition, the portability and the handling of the device are disadvantageous.

  Second, because it requires a cutting operation by a human operation using a cutter, cutting takes time and the operation involves considerable human labor. Since a single building usually requires dozens to hundreds of holes, shortening the time and labor required to make one hole is an important issue for this kind of hole drilling operation. There is a limit in the countermeasure based on the conventional device.

  It is an object of the present invention to provide a deck plate drilling bit and a deck plate drilling method which solve the problems existing in such background art.

  In order to solve the above-described problems, the deck plate drilling bit 1 according to the present invention has the upper portion 2u held on the chuck portion Hc of the power hammer H on the upper side, and has the pointed portion 2ds at the lower end. The lower portion 2d is provided on the lower side of the single shaft portion 2 and the lower portion 2d, and the lower end portions 3pd and 3qd are formed in a pointed shape while protruding from the lower portion 2d, and the lower end portion 3pd, By arranging 3qd near the pointed portion 2ds in the lower portion 2d, a blade portion 3p formed of a plate material Pm, Pme having at least a part of triangular surface portions 3ps, 3qs gradually widening toward the upper side When forming a bit that is integrally provided with 3 q and removes the deck plate portion Dr located inside the void tube B to make the hole Do empty, the lower portion The pair of blade portions 3p and 3q is provided with a pair of blade portions 3p and 3q protruding to the left and right sides of d, and the pair of blade portions 3p and 3q have an angle Qf between the front surfaces 3pf and 3qf of 90 to 180 ° in each blade portion 3p and 3q. Stopper 5 is integrally provided at the upper end, and blades 4p and 4q are formed on part or all of the outer side edge located on both left and right sides. At the same time, the shaft portion 2 is characterized in that it is disposed on the front surface 3 pf, 3 qf side of the blade portions 3 p, 3 q.

  On the other hand, in the method of forming a hole in the deck plate D according to the present invention, the lower portion 2d having the upper portion 2u held on the chuck portion Hc of the power hammer H on the upper side and the pointed portion 2ds formed on the lower end The lower portion 3pd, 3qd is formed in a pointed shape while being provided in the lower portion 2d and having a single shaft portion 2 on the side and the lower portion 2d, and the lower end 3pd, 3qd in the lower portion 2d By arranging in the vicinity of the pointed portion 2ds, a blade portion 3p, 3q formed of a plate material Pm, Pme having at least a part thereof triangular plane portions 3ps, 3qs gradually increasing in width toward the upper side is integrally provided. It is a drilling method of the deck plate which makes the hole Do by removing the deck plate part Dr located inside the void pipe B using the drilling bit. The lower portion 2d is provided with a pair of blade portions 3p and 3q protruding to the left and right sides, and the pair of blade portions 3p and 3q has an angle Qf between the front surfaces 3pf and 3qf of 90 to 90 in each of the blade portions 3p and 3q. Stopper 5 is integrally formed at the upper end with a stopper portion 5 integrally provided at the upper end portion, and blade portions 4p and 4q at a part or all of the outer end sides located on both left and right sides. The shaft portion 2 mounts the upper portion 2u of the drilling bit 1 disposed on the front surface 3pf, 3qf side of the blade portions 3p, 3q to the chuck portion Hc of the power hammer H. A hole is formed in the deck plate D by placing the drilling bit 1 vertically displaced by the hammer H against the edge of the deck plate portion Dr located inside the void tube B and sequentially cutting it. It is characterized in.

  Furthermore, according to a preferred embodiment of the present invention, the cross-sectional shape of the shaft portion 2 can be formed into a polygon. In addition, when drilling the deck plate D, small holes h may be formed in advance at the edge of the deck plate portion Dr to position the drilling bit 1 when the drilling bit 1 is made to abut.

  According to the above-described drilling method of the deck plate drilling bit 1 and the deck plate D according to the present invention, the following remarkable effects can be obtained.

  (1) Since the main body of the general-purpose power hammer H used as a concrete crusher can be used as it is, it is sufficient to prepare only the deck plate drilling bit 1 when drilling. Therefore, the purchase of a new main device is not necessary, and the implementation can be performed extremely easily and at low cost. And since it comprises as a bit which has a drilling function, while being able to implement by simple structure and a small-sized shape (structure), it is excellent also in portability and handleability.

  (2) Since the power hammer H is used as the cutting principle and cutting is performed by the hammer action by the repeated lifting and lowering displacement of the drilling bit 1, the cutting time can be largely shortened and the labor can be largely reduced. Moreover, since the conventional cutter is not used, the influence of wear during use is avoided, and the durability and the long life are excellent, and the running cost can be reduced.

  (3) Since the shaft portion 2 is disposed on the front surfaces 3pf and 3qf of the blade portions 3p and 3q, the protrusion of the shaft portion 2 on the rear surface side of the blade portions 3p and 3q is eliminated. As a result, it is possible to eliminate the recess due to the shaft portion 2 generated in the cutting opening Ds of the deck plate D, and to improve the shape quality of the hole Do which is made.

  (4) Since the angle Qf between the front faces 3pf and 3qf in each blade portion 3p and 3q is in the range of 90 to 180 °, the shape of the open hole Do, that is, more than the circle It can be approximated. As a result, it is possible to open a high quality hole Do close to a circle.

  (5) Since the blade portions 4p and 4q are formed on part or all of the outer side edge located on the left and right sides of the blade portions 3p and 3q, the cutting performance by the blade portions 3p and 3q can be further enhanced and smoothed The cutting work and the working time can be further shortened.

  (6) Since the stoppers 5 protruding toward the front face 3pf, 3qf are integrally provided at the upper end portions of the blade portions 3p, 3q, the blade portions 3p, 3q are opposite to the deck plate D when the deck plate D is cut. It is possible to avoid the problem of getting out of the

  (7) According to a preferred embodiment, if the cross-sectional shape of the shaft portion 2 is formed in a polygonal shape, surface contact of the blade portions 3p and 3q with the front surfaces 3pf and 3qf becomes possible. While being able to aim at manufacture simplification at the time of attaching and constructing body blade parts 3p and 3q, the joint strength of shaft part 2 and blade parts 3p and 3q can be raised.

  (8) According to a preferred embodiment, when drilling the deck plate D, small holes h are formed in advance at the edge of the deck plate portion Dr for positioning when the drilling bit 1 is abutted. If this is done, accurate positioning with respect to the cutting position by the drilling bit 1 and stability at the start of cutting can be enhanced, which can contribute to further simplification of the drilling operation and improvement of the working efficiency.

A perspective view of a deck plate drilling bit according to a preferred embodiment of the present invention; Front view of the drilling bit for the same deck plate, Side view showing part of the same deck plate drilling bit, Bottom view including the X-X line section of the drilling bit for the same deck plate, Flow chart to explain step by step the drilling method using the drilling bit for the same deck plate, A side view showing the deck plate holed bit mounted on a power hammer (electric hammer), Explanatory drawing of the cutting principle by the drilling bit for the same deck plate, The usage explanatory drawing of the drilling bit for the same deck plate, The cutting state explanatory drawing by the drilling bit for the same deck plate, The front view which shows the example of a change of the drilling bit for the same deck plate, A schematic bottom view showing another modification of the drilling bit for the same deck plate, The explanatory view showing the example of change of the drilling method using the drilling bit for the same deck plate,

  Next, preferred embodiments according to the present invention will be listed and described in detail based on the drawings.

  First, the configuration including the method for manufacturing the deck plate drilling bit 1 according to the present embodiment will be described with reference to FIGS. 1 to 4 (FIG. 6).

  As shown in FIGS. 1 and 2, as a basic configuration, the drilling bit 1 includes one shaft portion 2 and a pair of left and right blade portions 3p and 3q integrally provided to the shaft portion 2. . The shaft portion 2 has an upper portion 2u located on the upper side and a lower portion 2d located on the lower side, and is integrally formed in a straight rod shape with a hard metal such as steel. In the illustrated case, the upper portion 2 u and the lower portion 2 d both have a hexagonal cross-sectional shape, and the total length of the shaft portion 2 is selected to be approximately 38 cm.

  The upper portion 2u is formed so as to be detachable from the power hammer H, specifically, the chuck portion Hc of the electric hammer He shown in FIG. Thus, when the upper portion 2u is mounted on the chuck portion Hc, the upper portion 2u is held by the chuck portion Hc. In this case, the electric hammer He is not dedicated to the drilling bit 1 but can be used (shared) with the main body of a general-purpose concrete crusher generally marketed. The electric hammer He illustrated in FIG. 6 has a grip Hh that can be held by the operator on the opposite side of the chuck Hc, and a power switch (ON-OFF switch) is provided on the grip Hh. Hs is attached. Such an electric hammer He is not limited in type, and various models capable of causing the drilling bit 1 to function can be used. Accordingly, as the dimensions such as the shape and length of the upper portion 2 u provided in the shaft portion 2, various shapes and lengths can be selected according to the type of the electric hammer He to be attached. In the illustrated example, the length of the upper portion 2u is approximately 22 cm, and the length of the lower portion 2d is approximately 16 cm. Further, a pointed portion 2ds is formed at the lower end (tip) of the lower portion 2d.

   On the other hand, the blade portions 3p and 3q are integrally provided with respect to the lower portion 2d, and respectively project to the left and right sides of the lower portion 2d. As shown in FIG. 2, one blade portion 3p is integrally formed by a flat plate material Pm using a hard metal such as steel so that the entire shape becomes a trapezoid. In this case, the lower end 3pd is pointed and the upper end is a horizontal side. In addition, in the case of illustration, the thickness of the plate material Pm is about 3 [mm].

  Further, the longest side (the inner side located on the right side) is a fixed portion to the lower portion 2d, and when fixed to the lower portion 2d, the lower end 3pd is disposed in the vicinity of the pointed portion 2ds of the lower portion 2d. . Thus, the blade portion 3p includes a shape having at least a part of a triangular surface portion 3ps which gradually widens toward the upper side. Furthermore, the blade portion 4p is formed on a part or all of the outer side located on the left side of the blade portion 3p. In this case, the outer side edge of the blade portion 3p includes the vertical side located on the upper side and the inclined side located on the lower side. Specifically, as shown in the X-X cross-sectional enlarged view shown in FIG. 4, it is formed so that the cross-sectional angle at the central position in the inclined side becomes about 90.degree. ing. In the case of illustration, although the blade part 4p is formed only in the inclined side part, the same blade part 4p can be formed also in the vertical side part. Therefore, if such a blade portion 4p is formed, there is an advantage that the cutting performance by the blade portion 3p can be further enhanced, and the smooth cutting operation and the operation time can be further shortened.

  The other blade portion 3q is also formed (configured) in the same manner except for the point having a shape that is symmetrical with respect to the one blade portion 3p described above. In the blade portion 3q, 3qd is a lower end portion of the blade portion 3q, 3qs is a triangular plane portion of the blade portion 3q, and 4q is a blade portion of the blade portion 3q.

  The blade portions 3p and 3q are disposed such that the longest sides are in contact with each other, and are fixed to the lower portion 2d by welding portions j. In this case, as described above, the lower ends 3pd and 3qd of the blade portions 3p and 3q are positioned near the pointed portion 2ds in the lower portion 2d of the shaft portion 2, and the longest side is in the axial direction of the lower portion 2d Follow along. Under the present circumstances, since lower part 2d forms a section into a hexagon, as shown in Drawing 4, it can fix on two sides next to each other located in the back side (lower side in Drawing 4) of lower part 2d.

  As a result, since the longest sides of the blade portions 3p and 3q are in line contact with each other, the shaft portion 2 is disposed on the front surfaces 3pf and 3qf of the blade portions 3p and 3q. As described above, when the shaft portion 2 is disposed on the front surfaces 3pf and 3qf of the blade portions 3p and 3q, the protrusion of the shaft portion 2 on the rear surface side of the blade portions 3p and 3q is eliminated. There is an advantage that it is possible to eliminate the recess due to the shaft portion 2 that occurs in the cutting opening Ds, and to improve the shape quality of the opening hole Do.

  Further, since the cross-sectional shape of the shaft portion 2 (lower portion 2d) is a hexagon, surface contact of the blade portions 3p and 3q with the front surfaces 3pf and 3qf is possible. This makes it possible to facilitate the manufacture especially when attaching and constructing the separate blade portions 3p and 3q to the shaft portion 2 and also to increase the bonding strength between the shaft portion 2 and the blade portions 3p and 3q. . Moreover, in the illustrated example, the cross-sectional shape of the shaft portion 2 is a hexagon, and as shown in FIG. 4, the angle Qf between the front surfaces 3pf and 3qf in each blade portion 3p and 3q is 120 °. The shape of the hollow hole Do can be made closer to the shape of the circular shape, that is, the circular shape of the high-quality hollow hole Do can be drilled (see FIG. 9B). The same effect can be obtained by arranging the blade portions 3p and 3q so that the angle Qf between the front surfaces 3pf and 3qf in the blade portions 3p and 3q is in the range of 90 to 180 °. You can get it.

  Further, stoppers 5 protruding toward the front surfaces 3pf and 3qf are integrally provided at upper end portions of the blade portions 3p and 3q. In the case of the example, the stopper portion 5 formed of one flat plate member is integrally fixed by the welding portion j so as to straddle the upper end portions of the blade portions 3p and 3q and the shaft portion 2. Therefore, if such a stopper 5 is provided, there is an advantage that it is possible to avoid the problem that the blade portions 3p and 3q come out to the opposite surface of the deck plate D when the deck plate D is cut. Thus, the deck plate drilling bit 1 according to the present embodiment can be obtained.

  Therefore, according to the deck plate drilling bit 1 according to this embodiment, the upper portion 2u held on the chuck portion Hc of the electric hammer He is provided on the upper side, and the pointed portion 2ds is formed at the lower end. The lower portion 2d is provided on the lower side of the shaft portion 2 and the lower portion 2d is provided, and the lower portion 3pd and 3qd are formed in a pointed shape while projecting to the left and right sides of the lower portion 2d By arranging the portions 3pd and 3qd in the vicinity of the pointed portion 2ds in the lower portion 2d, a pair of left and right formed by a plate material Pm having at least a part of triangular planar portions 3ps and 3qs gradually widening toward the upper side Because it has a basic configuration in which the blade portions 3p and 3q are integrally provided, the main body of a versatile power hammer H used as a concrete crusher can be used as it is . Therefore, when carrying out drilling, it is sufficient to prepare only the deck plate drilling bit 1 and purchase of a new main unit is not necessary, so that implementation can be carried out extremely easily and at low cost. And since it comprises as a bit which has a drilling function, while being able to implement by simple structure and a small-sized shape (structure), it is excellent also in portability and handleability.

  Next, the method for forming a hole in the deck plate D according to the present embodiment using such a hole formation bit 1 will be described according to the flow chart (process diagram) shown in FIG. 5 mainly referring to FIGS. explain.

  In addition, in order to help understanding of the drilling method of the deck plate D, it demonstrates including the construction method of the deck plate D. FIG. Now, it is assumed that a concrete structure such as a building, in particular, the floor portion shown in FIG. 8 in the concrete structure is to be constructed.

  When installing this floor portion, first, a metal deck plate D having a certain thickness is installed (step S1). The deck plate D is usually formed into a corrugated shape in order to secure load strength from above. Next, a paper void tube B is attached and raised at a predetermined position (usually near the wall surface) on the upper surface of the deck plate D (step S2). In this case, the length of the void tube B is selected to be longer than the layer thickness of concrete C described later. The void tube B has an axial center in the vertical direction, one open end is placed facing the upper surface of the deck plate D, and is fixed to the deck plate D by a predetermined fixture including a screw or the like. Further, the gap between the open end of the void tube B and the deck plate D is closed by a predetermined seal member.

  Further, the upper ends of the suspension rods Ns are fixed to the deck plate D. A ceiling panel (not shown) is fixed to the lower end of the suspension rod Ns. Thereafter, concrete C is cast on the deck plate D (step S3). Thereby, a layer of concrete C is provided on the upper surface of the deck plate D. At this time, the penetration of concrete C into the inside of the void tube B is prevented by the void tube B. In addition, a predetermined floor panel is laid on the upper surface of the concrete C. By the above, the structure of the basic floor part in a concrete structure can be constructed.

  Next, a drilling operation is performed to remove the deck plate portion Dr located inside the void tube B. When the drilling operation is performed, as shown in FIG. 6, the main body of the electric hammer He is prepared, and the upper portion 2u of the drilling bit 1 is inserted into and attached to the chuck portion Hc (step S4). FIG. 6 shows the attached state.

  Then, as shown in FIG. 8, the operator holds the grip Hh of the electric hammer He with the hand Mh, and cuts the pointed portion 2 ds of the drilling bit 1 at the cutting position of the deck plate D, that is, the inside of the void tube B. It is pressed to a predetermined cutting position at the edge of the deck plate portion Dr located at (step S5). After this, the power switch Hs is turned on (step S6). As a result, the electric hammer He is operated, and the drilling bit 1 exhibits a hammer action by repetitively (oscillatingly) moving up and down (step S7). As a result, immediately after the start of drilling, holes are made in the deck plate D by the pointed portions 2ds of the drilling bit 1, and thereafter, cutting into the deck plate D by the blade portions 3p and 3q, that is, cutting the deck plate D Is performed (step S8). This state is shown in FIG. In FIG. 7, an arrow Fm indicates the displacement direction of the drilling bit 1, and Ds indicates a cutting opening. Then, cutting to the target position, that is, when the triangular portions 3ps and 3qs in the blade portions 3p and 3q of the drilling bit 1 reach the position where the deck plate D is passed, the cutting at this position is ended (step S9, S10). Specifically, the power switch Hs is turned off, and the drilling bit 1 is pulled out of the deck plate D.

  FIG. 9A shows the cutting opening Ds after the cutting operation at the first cutting position is completed. Next, a second cutting operation is performed (steps S10, S5...). In this case, the pointed portion 2 ds of the drilling bit 1 is pressed to the next cutting position on the deck plate D, that is, the next cutting position on the edge of the deck plate portion Dr located inside the void tube B. In this case, the next cutting position may be a position adjacent to the first cutting position, or may be a separated position (for example, a position on the opposite side of 180 °). In any case, finally, as shown in FIG. 9 (b), selection of cutting positions where the cutting openings Ds... Are continuous with each other is performed. Then, if cutting is sequentially performed along the edge of the deck plate portion Dr, and the cutting openings Ds are connected in a ring shape, the deck plate portion Dr can be removed, and the target hole Do can be opened. It can do (step S11). After the deck plate portion Dr is removed, the void tube B is removed from the concrete C (step S12). This completes the drilling operation at this location.

  Therefore, according to the method for forming a hole in the deck plate D according to the present embodiment, one having the upper portion 2 u at the upper side and the lower portion 2 d at the lower end having the pointed portion 2 ds at the lower side The lower portion 3pd, 3qd is formed in a pointed shape, and the lower end 3pd, 3qd is formed in a pointed shape in the lower portion 2d. By arranging in the vicinity of the part 2ds, a pair of left and right blade parts 3p, 3q formed by a plate material Pm having at least a part of triangular surface shaped parts 3ps, 3qs gradually becoming wider toward the upper side are integrally formed. The upper part 2u of the hole making bit 1 is mounted on the chuck portion Hc of the electric hammer He, and the hole making bit 1 is vertically displaced by the electric hammer He. Since drilling is performed on the deck plate D by sequentially pressing it against the edge of the deck plate portion Dr located inside the tube B, the electric hammer He is used as a cutting principle to repeat the drilling bit 1 Cutting can be performed by the hammer action by the up-and-down displacement. As a result, the cutting time can be significantly shortened and the labor can be significantly reduced. Moreover, since the conventional cutter is not used, the influence of wear during use is avoided, and the durability and the long life are excellent, and the running cost can be reduced. In addition, although it may be considered that the deck plate D is slightly bent downward in principle of cutting, the deck plate D is a hidden structure which can not be seen from the outside, which causes a problem in construction. There is no.

  Next, a modification of the hole drilling method for the deck plate drilling bit 1 and the deck plate D according to the present embodiment will be described with reference to FIGS.

  FIG. 10 shows a modification in which the details of the details in the deck plate drilling bit 1 are further optimized. Specifically, by forming the stepped portion 2uc in the upper portion 2u of the shaft portion 2 with a gently curved surface, it is more difficult to break, and from the middle portion to the lower end (tip) in the lower portion 2d of the shaft portion 2 The lower portion lower portion 2dd is formed to be smaller in diameter and formed into a round rod shape having a circular cross section, and the tip portion 2d at the tip of the lower portion 2d is formed to have a sharper angle when forming the pointed portion 2d Is formed in the shape of a quadrangular pyramid having a rectangular cross section, which makes it easier and smoother to make a hole in the deck plate D from the beginning, and the like.

  Further, FIG. 11 shows a modified example in which the shapes and angles of the blade portions 3p and 3q in the deck plate drilling bit 1 are mainly changed. Although the drilling bit 1 shown in FIGS. 1 to 4 has formed the respective blade portions 3p and 3q using the flat plate material Pm, the blade portions 3p and 3q shown in FIG. 11A have an arc shape. The lower portion 2d of the shaft portion 2 is fixed at the center position of the plate material Pme using the plate material Pme bent in the following. In this case, the pair of blade portions 3p and 3q are integrated, one side of the lower portion 2d is one blade portion 3p, and the other side of the lower portion 2d is the other blade portion 3q. Even in such a modification, the angle Qf between the front faces 3pf and 3qf in the blade portions 3p and 3q falls within the range of 90 to 180 °. In this modification, since the shape of the cutting opening Ds is an arc shape, theoretically, the open hole Do can also be circular. In addition, the cross-sectional shape of the lower part 2d illustrated is circular.

  Further, FIG. 11 (b) is selected so that the angle Qf between the front surfaces 3pf and 3qf in the blade portions 3p and 3q is 180 ° when the blade portions 3p and 3q are arranged. Therefore, the same flat plate material Pm as the embodiment of FIGS. 1 to 4 is used, and the lower portion 2d of the shaft portion 2 is fixed at the center position of the plate material Pm. Also in this modification, the pair of blade portions 3p and 3q are integrated, one side of the lower portion 2d is one blade portion 3p, and the other side of the lower portion 2d is the other blade portion 3q. This variation is the simplest form and therefore the most advantageous embodiment from a manufacturing point of view.

  On the other hand, in FIG. 12, when drilling the deck plate D, small holes h are formed in advance at the edge of the deck plate portion Dr for positioning when the drilling bit 1 is made to abut. The example of the change of the drilling method which was made is shown. The small holes h can be easily provided using an electric drill or the like. Therefore, if such small holes h are formed, accurate positioning with respect to the cutting position by the drilling bit 1 and stability at the start of cutting can be enhanced, thereby further facilitating the drilling operation and working efficiency. There is an advantage that can contribute to the improvement of

  As mentioned above, although a preferred embodiment and a modification were explained in detail, the present invention is not limited to such an embodiment, The composition of a detail, shape, material, quantity, a numerical value etc. It is possible to change, add, or delete arbitrarily without departing from the above.

  For example, the triangular surface portions 3 ps and 3 qs do not need to be formed into accurate triangular surfaces, and may be modified triangular surfaces that partially include sides by curves. Also, each of the blade portions 3p and 3q may be formed as two separate members, or may be integrally formed as in the modification shown in FIG. Furthermore, although each blade part 3p, 3q and the shaft part 2 were separately formed, and showed the case where it integrated by welding part j ..., each blade part 3p, 3q and the shaft part 2, and also a stopper part 5 may be integrally molded by casting or the like, that is, the whole of the drilling bit 1 may be integrally molded. On the other hand, although a hexagonal shape has been exemplified as the cross-sectional shape of the shaft portion 2, various polygons such as a quadrangle and an octagon can be applied, and they do not necessarily have to be polygons. Thus, the cross-sectional shape and thickness of the upper portion 2 u and the lower portion 2 d may be the same or different.

  The drilling method of the deck plate drilling bit 1 and the deck plate D according to the present invention can be used for drilling various deck plates D.

  1: Deck plate drilling bit, 2: shaft portion, 2u: upper portion, 2d: lower portion, 2ds: pointed portion, 3p: blade portion, 3q: blade portion, 3pd: lower end portion, 3qd: lower end portion, 3 ps: triangular surface, 3 qs: triangular surface, 3 pf: front of blade, 3 qf: front of blade, 4 p: blade, 4 q: blade, 5: stopper, B: void tube, D: Deck plate, Do: hole, Dr: deck plate portion, H: power hammer, Hc: chuck portion, Pm, Pme: plate material, Qf: angle between front surfaces of blade portions, h: small hole for positioning

Claims (4)

  One shaft portion having an upper portion on the upper side held by the chuck portion of the power hammer and a lower portion having a pointed portion at the lower end provided on the lower portion, and the lower portion By projecting the lower end portion in a pointed shape and arranging the lower end portion in the vicinity of the pointed portion at the lower portion, at least a part of the triangular surface which gradually widens toward the upper side A drilling bit of a deck plate which is integrally provided with a blade portion formed of a plate material and has a deck plate portion located inside a void tube removed to make a hole, and is provided on both left and right sides of the lower portion. A pair of protruding blade portions are provided, and the pair of blade portions are disposed such that the angle between the front surfaces of the blade portions is in the range of 90 to 180 °, and the front end side is at the upper end A protruding stopper portion is integrally provided, and a blade portion is formed on a part or all of outer side edges located on both left and right sides, and the shaft portion is disposed on the front side of the blade portion. A drilling bit in the deck plate to be used.   The deck plate drilling bit according to claim 1, wherein the shaft portion has a polygonal cross-sectional shape.   One shaft portion having an upper portion on the upper side held by the chuck portion of the power hammer and a lower portion having a pointed portion at the lower end provided on the lower portion, and the lower portion By projecting the lower end portion in a pointed shape and arranging the lower end portion in the vicinity of the pointed portion at the lower portion, at least a part of the triangular surface which gradually widens toward the upper side A method of drilling a deck plate in which holes are formed by removing a deck plate portion located inside a void tube using a drilling bit integrally provided with a blade portion formed of a plate material, The lower portion is provided with a pair of blade portions projecting to the left and right sides of the lower portion, and the pair of blade portions is such that the angle between the front surfaces of the respective blade portions is in the range of 90.degree. The upper end portion is integrally provided with a stopper portion projecting to the front side, and a blade portion is formed on a part or all of the outer side edge located on both left and right sides, and the shaft portion is of the blade portion The upper portion of the drilling bit arranged on the front side is attached to the chuck portion of the power hammer, and the deck plate portion is positioned inside the void tube with the drilling bit vertically displaced by the power hammer. A drilling method of a deck plate, characterized in that the drilling of the deck plate is carried out by being sequentially applied to the edge of the deck plate.   4. The method for drilling a deck plate according to claim 3, wherein a small hole is formed in advance at the edge of the deck plate portion for positioning when the drilling bit is abutted.

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