JP6641675B1 - Laying iron plate joints for construction sites - Google Patents

Abstract

An object of the present invention is to provide a joint of a laying iron plate for a construction site, which can reduce the burden of mounting a nut on a base portion. A first recess is formed at a lower central portion of a base portion. The first recess 13 includes a square nut insertion part 131 having a shape similar to the shape of the square nut 40, and a lid fitting part 132 formed below the square nut insertion part 131. The square nut insertion portion 131 is formed so that the square nut 40 does not rotate around its central axis when the square nut 40 is inserted, and has a gap between itself and the square nut 40. The mounting part 132 is formed to have a depth smaller than the height of the square nut 40. After the square nut 40 is inserted into the square nut insertion portion 131, the cover portion 50 is fitted to the cover fitting portion 132 using a hammer or the like, so that the square nut 40 is mounted on the base portion 10. [Selection diagram] FIG.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for a construction site spread iron plate used for sandwiching and connecting at least two spread iron plates.

  Normally, at construction sites, spread iron plates are used to secure a material carry-in path and to cure a work place. In recent years, for example, a joint described in Patent Literature 1 is widely used as a joint for fixing spread iron plates. This joint includes a cup portion as an upper plate, a base portion as a lower plate, four pins, and bolts. A through hole is formed at the center of the cup and the base. A screw is set up in the through hole of the base using a tap. Each pin is provided on the bottom surface of the cup portion. After sandwiching the adjacent laid iron plates between the cup and the base from above and below, bolts are inserted into the through holes of the cup and screwed into the screws set in the through holes of the base. Accordingly, the cup portion and the base portion firmly sandwich the spread iron plate and each pin bites into the spread iron plate, so that it is possible to reliably prevent the spread of the spread iron plate in a vertical direction or a lateral direction.

  However, in the joint described in Patent Literature 1, the cup portion and the base portion are castings, while bolts having high strength made of high-tensile steel are used. When the bolt is tightened, a tensile load is applied to the screw of the base part by the tightening of the bolt, but since the base part is weaker in strength than the bolt, the screw of the base part is easily damaged. For this reason, conventionally, every time the screw is damaged, the entire base portion has to be replaced, and there is a problem that there is much waste.

  In order to solve this problem, recently, a joint of a spread iron plate described in Patent Document 2, for example, has been proposed. In this joint, instead of setting a screw in the through hole of the base portion, a first concave portion is formed in the lower central portion of the base portion, and a nut is replaceably fitted into the first concave portion from the lower surface side of the base portion. I am wearing it. Thereby, when the nut is damaged, the damaged nut can be replaced with a new one, so that it is not necessary to replace the entire base portion, and resources can be saved.

JP 2000-352124 A Japanese Patent No. 6241561

  By the way, in the joint of the spread iron plate described in Patent Literature 2, it is necessary to securely fix the nut to the base so that the nut does not drop from the base. In this case, if the nut is hit with a hammer and fitted into the first concave portion, it is difficult to accurately adjust the inclination of the nut, and therefore, the center axis of the nut coincides with the center axis of the through hole of the base portion. Often it does not. In this case, the bolt cannot be screwed into the nut. Therefore, the work of fitting the nut must be repeated, and there is a problem that the work is wasteful.

  The present invention has been made based on the above circumstances, and an object of the present invention is to provide a joint of a laying iron plate for a construction site, which can reduce the burden of an operation of attaching a nut to a base portion.

  The present invention for achieving the above object is a joint of a construction site spread iron plate used to sandwich and connect at least two spread iron plates, and (1) is formed in a substantially disk shape. There is a projection formed so as to protrude from the upper surface at a position equidistant to both sides from the center position of the upper surface, a first concave portion formed at the lower central portion, and an upper surface of the first concave portion. A base portion having a first hole portion formed so as to penetrate the center portion; and (2) a second hole formed substantially in a disk shape and formed so as to penetrate the center portion. A cup portion having a portion, (3) a square nut housed in the first recess from below the base portion, and (4) a lower surface side of the base portion for housing the square nut in the first recess. And (5) the second hole matches the first hole. A bolt for screwing into a square nut housed in the first recess through the second hole and the first hole from the upper side of the cup when the cup is placed on the base so as to cover the cup, The first recess includes a square nut insertion part for inserting a square nut, and a lid fitting part formed on the lower side of the square nut insertion part for fitting the lid. The nut insertion portion is formed so that when the square nut is inserted, the square nut does not rotate around its central axis and has a gap between itself and the lid fitting portion. The depth is formed shallower than the height of the square nut, and the square nut is inserted from the lid fitting portion into the square nut insertion portion.

  In the joint of the construction site spread iron plate of the present invention, the first concave portion formed in the lower central portion of the base portion has a square nut insertion portion for inserting a square nut, and a lower portion of the square nut insertion portion. And a lid fitting portion formed. The square nut insertion portion is provided with a gap so that the square nut does not rotate around its central axis when the square nut is inserted, and a gap between the square nut and the square nut. On the other hand, the lid fitting portion is formed so that its depth is shallower than the height of the square nut. That is, the square nut is arranged so that it cannot rotate freely in the first concave portion, but is not firmly fixed, so that if the base portion is moved, the square nut is loose. . For this reason, in the joint of the construction site spread iron plate of the present invention, after inserting the square nut into the square nut insertion portion, the worker simply fits the cover into the cover fitting portion with a hammer or the like, and the square nut is removed. The mounting work of the square nut is very easy because it can be mounted on the base part.

  In the joint of the construction site spread iron plate of the present invention, the square nut is attached to the base portion in a state in which the square nut is not completely fixed as described above, but the bolt can be easily screwed into the square nut. After inserting the iron plate between the base and the cup, and screwing the bolt into the square nut through the second hole and the first hole from the upper surface of the cup, the center axis of the bolt and the center axis of the square nut Even if they do not completely match, in the present invention, since the square nut is not firmly fixed, the square nut can follow the movement of the bolt so that its central axis coincides with the center axis of the bolt. Because you can.

  In the joint of the spread sheet iron for a construction site of the present invention, the lid fitting portion may be formed in a substantially cylindrical shape, and a flat washer may be used as the lid. As a result, a commercially available product can be used as the lid, so that an increase in manufacturing cost can be suppressed.

  In the joint of the construction site spread iron plate of the present invention, the first concave portion formed in the lower central portion of the base portion has a square nut insertion portion for inserting a square nut, and a lower portion of the square nut insertion portion. And a lid fitting portion formed. The square nut insertion portion is provided with a gap so that the square nut does not rotate around its central axis when the square nut is inserted, and a gap between the square nut and the square nut. On the other hand, the lid fitting portion is formed so that its depth is shallower than the height of the square nut. For this reason, after inserting the square nut into the square nut insertion part, the operator can mount the square nut on the base part simply by fitting the lid part into the lid fitting part with a hammer or the like. Mounting work is very easy.

FIG. 1 is a schematic perspective view of a joint of an iron sheet for a construction site according to an embodiment of the present invention. FIG. 2A is a schematic plan view of a joint of a construction site spread iron plate of the present embodiment, and FIG. 2B is a schematic side view of the joint of the construction site spread iron plate. FIG. 3 is a schematic cross-sectional view in the direction of arrows AA of the joint of the laying iron plate for a construction site of the present embodiment. FIG. 4A is a schematic plan view of a base part in a joint of a laying iron plate for a construction site according to the present embodiment, and FIG. 4B is a schematic side view of the base part. 5A is a schematic bottom view of the base shown in FIG. 4, and FIG. 5B is a schematic cross-sectional view of the base shown in FIG. FIG. 6A is a schematic plan view of a cup portion in a joint of a laying iron plate for a construction site according to the present embodiment, and FIG. 6B is a schematic side view of the cup portion. 7A is a schematic bottom view of the cup portion shown in FIG. 6, and FIG. 7B is a schematic cross-sectional view of the cup portion shown in FIG. FIG. 8 is a schematic side view of a pin in a joint of a spreadsheet for construction site according to the present embodiment. FIG. 9A is a schematic perspective view of a bolt in a joint of a laying iron plate for a construction site according to the present embodiment, FIG. 9B is a schematic plan view of the bolt, and FIG. 9C is a schematic side view of the bolt. is there. FIG. 10A is a schematic perspective view of a nut in a joint of a construction site spread iron plate according to the present embodiment, FIG. 10B is a schematic plan view of the nut, and FIG. 10C is a schematic side view of the nut. is there. FIG. 11A is a schematic perspective view of a lid portion of a joint of a laying iron plate for a construction site according to the present embodiment, and FIG. 11B is a schematic plan view of the lid portion. FIG. 12A is a schematic enlarged plan view of the first concave portion in FIG. 5A, and FIG. 12B is a schematic enlarged sectional view of the first concave portion in FIG. 5B. FIG. 13 is a schematic sectional view of a base portion to which a square bolt and a lid are attached. FIG. 14 is a diagram for explaining a method of attaching the joint of the construction site spread iron plate of the present embodiment. FIG. 15 is a schematic perspective view of a dedicated jig used to fit the lid into the lid fitting portion. 16A is a schematic side view of a support jig for the dedicated jig, FIG. 16B is a schematic side view of a pusher of the dedicated jig, and FIG. 16C is a schematic plan view of the pusher. It is. FIG. 17 is a diagram for explaining how to use the dedicated jig.

  An embodiment for carrying out the invention according to the present application will be described below with reference to the drawings. FIG. 1 is a schematic perspective view of a joint of an iron sheet for a construction site according to an embodiment of the present invention. FIG. 2A is a schematic plan view of a joint of a construction site spread iron plate of the present embodiment, and FIG. 2B is a schematic side view of the joint of the construction site spread iron plate. FIG. 3 is a schematic cross-sectional view in the direction of arrows AA of the joint of the laying iron plate for a construction site of the present embodiment.

  The joint (hereinafter, also simply referred to as a joint) of a laying iron plate for a construction site according to the present embodiment is used to sandwich and connect at least two laying iron plates, and as shown in FIGS. 1 to 3, A base portion 10 on which an end of a laid iron plate to be connected is placed, a cup portion 20 arranged to cover the base portion 10 from above, a bolt 30 and a square nut connecting the base portion 10 and the cup portion 20 40 and the opening of the first concave portion 13 is placed on the lower side so that the square nut 40 does not come out when the square nut 40 is accommodated in the first concave portion 13 formed at the lower central portion of the base portion 10. And a cover 50 for closing the cover. Here, the square nut 40 does not mean a circular nut but a polygonal nut such as a hexagonal nut or a square nut.

  First, the base unit 10 will be described. FIG. 4A is a schematic plan view of the base portion 10 in the joint of the spread sheet iron for a construction site according to the present embodiment, and FIG. 4B is a schematic side view of the base portion 10. 5A is a schematic bottom view of the base 10 shown in FIG. 4, and FIG. 5B is a schematic cross-sectional view of the base 10 shown in FIG. The base portion 10 is made of a metal formed in a substantially disk shape. As shown in FIGS. 1, 3, 4 and 5, the base 10 has two projections 11, 11 formed at predetermined positions on the upper surface thereof, and is provided between the two projections 11, 11. It has a formed wall portion 12, a first concave portion 13 formed at a lower central portion of the base portion 10, and a first hole portion 14 formed so as to penetrate a central portion of the base portion 10. In the present embodiment, the base portion 10 is formed integrally with, for example, a casting.

  The diameter of the base 10 is about 130 mm. As shown in FIGS. 4B and 5A, three ribs 17, 17, 17 are formed on the lower surface of the base 10. In the present embodiment, these ribs 17, 17, 17 are formed in parallel with each other, and the middle rib 17 passes through the center position of the lower surface of the base portion 10. The thickness of the base 10 including the ribs 17 (excluding the protrusions 11, 11 and the wall 12) is about 25 mm. On the other hand, as shown in FIG. 4, two projections 11 are formed on the upper surface of the base 10. The protrusions 11 are formed at equal intervals on both sides from the center of the upper surface of the base 10 so as to protrude from the upper surface of the base 10. Each protruding portion 11 has tapered side surface portions 110, 110 used for positioning the laid iron plate to be connected. The height of the protrusion 11 is about 25 mm. The width of the bottom surface of the protrusion 11 in the vertical direction in FIG. 4A is about 25 mm. Note that a paint of a conspicuous color or a paint emitting a fluorescent color is applied to the upper surface of each protrusion 11.

  Further, in the present embodiment, the wall portion 12 having a height lower than the protrusion 11 is provided between the two protrusions 11, 11. The wall 12 is formed integrally with the two protrusions 11, 11. Specifically, the height of the wall 12 is about 15 mm. Therefore, the thickness of the entire base portion 10 is about 50 mm. The width in the vertical direction in FIG. 4A at the center of the wall portion 12 is about 25 mm similarly to the width in the vertical direction in FIG. , 120 can also be used when positioning the spread iron plate. Here, the width in the vertical direction in FIG. 4A is different between the central portion of the wall portion 12 and both end portions thereof. That is, the width in the vertical direction in FIG. 4A at both ends of the wall portion 12 is formed smaller than the width in the vertical direction in FIG. Note that the wall portion 12 can be omitted.

  The first concave portion 13 is for accommodating the square nut 40, and is formed at a lower central portion of the base portion 10 as shown in FIGS. The first recess 13 has a square nut insertion portion 131 for inserting the square nut 40, and a lid fitting portion 132 formed below the square nut insertion portion 131. After the square nut 40 is inserted into the square nut insertion part 131, the cover part 50 is fitted into the cover fitting part 132 from below the first recess 13, whereby the square nut 40 is housed in the first recess 13. You.

  The square nut insertion portion 131 has a shape similar to the shape of the square nut 40. The width of the lid fitting portion 132 is formed to be the same as or larger than the width of the square nut insertion portion 131 so that the square nut 40 can be inserted into the first recess 13 from the lid fitting portion 132. I have. Specifically, when the lid fitting portion 132 is formed in a substantially cylindrical shape, the diameter of the lid fitting portion 132 is formed to be equal to or larger than the diameter of the circumscribed circle of the cross-sectional shape of the square nut 40. ing. The square nut insertion portion 131 is designed so that the square nut 40 does not rotate around its central axis when the square nut 40 is inserted, and that there is a gap between the square nut 40 and the square nut 40. The lid fitting portion 132 is designed so that its depth is smaller than the height of the square nut 40. Therefore, although the square nut 40 is arranged so as not to be able to freely rotate in the first recess 13, it is not firmly fixed. It has become. The specific sizes of the square nut insertion portion 131 and the lid fitting portion 132 will be described later.

  The first hole 14 is for passing the bolt 30, and is formed on the upper surface of the first recess 13 so as to penetrate the center of the base 10 (the wall 12). Specifically, the diameter of the first hole 14 is about 17 mm.

  It should be noted that the base 10 used in the present embodiment has a smaller diameter, and the protrusions 11, 11, the wall 12 and the rib 17 are smaller than those of the conventional one described in Patent Documents 1 and 2, for example. The thickness of the body portion except for the main body is reduced, or the width in the vertical direction of FIG. 4A at both ends of the wall portion 12 is smaller than the width in the vertical direction of FIG. By doing so, size and weight are reduced. As a result, the workability when using the joint of the present embodiment is improved and the manufacturing cost is reduced.

  On the other hand, it is not so recommended that the cup section 20 be significantly reduced in size and weight. Usually, at a construction site, a work vehicle or the like frequently passes over an iron plate sandwiched between joints. At this time, since the iron plate vibrates up and down, the cup portion 20 is required to have sufficient strength to suppress the vibration from above. Therefore, in order to maintain the strength of the cup part 20, it is desirable to use the cup part 20 having substantially the same structure as that of the related art without significantly reducing the size and weight.

  Next, the cup section 20 will be described. FIG. 6A is a schematic plan view of the cup portion 20 in the joint of the spread sheet iron for a construction site according to the present embodiment, and FIG. 6B is a schematic side view of the cup portion 20. 7A is a schematic bottom view of the cup portion shown in FIG. 6, and FIG. 7B is a schematic cross-sectional view of the cup portion shown in FIG. The cup part 20 is made of metal formed in a substantially disk shape. As shown in FIGS. 1 to 3, 6 and 7, the cup portion 20 is formed so as to penetrate through the bolt recess 21 formed in the upper central portion thereof and the central portion of the cup portion 20. The second hole 22, four holes (second recesses) 23 formed at predetermined positions on the lower surface of the cup 20, and four metal pins 24 fitted into the holes 23. Have. In the present embodiment, the cup portion 20 is formed integrally with, for example, a casting except for the pin 24. The pin 24 is made of steel.

  The periphery of the upper surface of the cup portion 20 is rounded. In the present embodiment, the diameter of the cup portion 20 is slightly smaller than the diameter of the base portion 10. For example, the diameter of the cup part 20 is about 126 mm, and its thickness is about 26 mm. However, in general, the diameter of the cup 20 may be the same as or larger than the diameter of the base 10. The second hole portion 22 is for passing the screw portion of the bolt 30, and is formed to penetrate the center of the cup portion 20 on the bottom surface of the concave portion 21 for the bolt. The diameter of the bolt recess 21 is larger than the diameter of the second hole 22. For example, the diameter of the bolt recess 21 is about 52 mm on the upper side, about 36 mm on the bottom thereof, and the diameter of the second hole 22 is about 18 mm. The bolt recess 21 plays a role of storing a screw head formed on an upper part of the bolt 30. For this reason, the diameter of the bolt recess 21 is designed to be large enough to allow a wrench to be fitted to the screw head with the screw head of the bolt 30 stored in the bolt recess 21.

  As shown in FIG. 7A, the steel pins 24, 24, 24, 24 are, as shown in FIG. They are provided at predetermined intervals in the direction, in this embodiment, at equal intervals. Specifically, the position where the pin 24 is provided is about 50 mm away from the center position of the cup 20. One end of each pin 24 is formed in a substantially conical shape, and the other portion is formed in a substantially cylindrical shape. FIG. 8 is a schematic side view of the pin 24 in the joint of the construction site spread iron plate of the present embodiment. As shown in FIG. 8, the pin 24 includes a pin lower part 24a formed in a substantially conical shape and a pin upper part 24b formed in a substantially cylindrical shape. The length of the pin upper part 24b is about 10.8 mm, and the entire length of the pin is about 15.5 mm. The half vertex angle of the pin lower portion 24a is about 46 degrees. The diameter of the upper pin 24b is about 9 mm, and a step of about 0.45 mm is provided between the upper pin 24b and the lower pin 24a. Further, the periphery of the upper surface of the pin upper portion 24b is chamfered to about 30 degrees.

  As shown in FIG. 7B, a hole (second concave portion) 23 into which the pin upper portion 24b is fitted is formed at a predetermined position on the lower surface of the cup portion 20. The hole 23 is made of a drill having a taper of 30 degrees at the tip. After the pin upper portion 24b is fitted into the hole portion 23, as shown in FIG. 7A, punching 27 is performed on three portions of the cup portion 20 around the pin 24, so that the pin 24 is It is firmly fixed to the part 20. At this time, as shown in FIG. 6B, the tip of the pin 24 formed in a substantially conical shape protrudes about 4 mm below the lower end surface of the cup portion 20. When the joint is used, an operation of hitting the cup portion 20 with a hammer to lay the pins 24 and stab the iron plate is performed. Note that a through hole 25 is formed above the hole 23 into which the pin 24 is fitted. The through holes 25 are used when the pins 24 are pulled out.

  Further, as shown in FIG. 7A, between the adjacent pins 24 on the lower surface of the cup portion 20, protrusion concave portions 26, 26, 26, 26 into which the upper ends of the protrusions 11, 11 can enter. Are formed. By forming the four recesses 26, 26, 26, 26 for the projections in this manner, the weight of the cup portion 20 can be reduced.

  Further, as shown in FIGS. 1, 2 (a), 3, 6 (a) and 7 (b), a circular groove centered on the center of the cup portion 20 is provided on the upper surface of the cup portion 20. 28 are formed. The diameter of the circular groove 28 is about 80 mm, and the width and depth of the groove 28 are both about 3 mm. The groove 28 serves as a slip stopper in rainy weather. Further, a gauge groove 29 is formed at the peripheral end of the bolt recess 21 on the upper surface of the cup portion 20. When an automobile or the like passes over the joint of this embodiment many times, the upper surface of the cup portion 20 gradually wears, and eventually the upper surface of the cup portion 20 becomes the same height as the screw head of the bolt 30. If the joint is continued to be used after that, the screw head of the bolt 30 may be damaged or broken. In order to avoid this, in the present embodiment, the use limit of the cup portion 20 is determined using the gauge groove 29. That is, the depth of the gauge groove 29 is set in advance to a predetermined value such that the bottom surface of the gauge groove 29 is positioned above the screw head of the bolt 30. Then, the user periodically monitors the gage groove 29 during use of the joint, and replaces the cup portion 20 when it is determined that the gage groove 29 has worn out and has disappeared.

  In the present embodiment, the base 10 and the cup 20 are coated. However, plating may be performed instead of painting.

  Next, the bolt 30, the square nut 40, and the lid 50 will be described. FIG. 9A is a schematic perspective view of a bolt 30 in a joint of a laying iron plate for a construction site according to the present embodiment, FIG. 9B is a schematic plan view of the bolt 30, and FIG. It is a side view. 10A is a schematic perspective view of the square nut 40 in the joint of the spread sheet iron for a construction site according to the present embodiment, FIG. 10B is a schematic plan view of the square nut 40, and FIG. It is a schematic side view of 40. FIG. 11A is a schematic perspective view of a lid 50 in a joint of a laying iron plate for a construction site according to the present embodiment, and FIG. 11B is a schematic plan view of the lid 50. FIG. 12A is a schematic enlarged plan view of the first concave portion 13 in FIG. 5A, and FIG. 12B is a schematic enlarged sectional view of the first concave portion 13 in FIG. 5B. FIG. 13 is a schematic sectional view of the base 10 to which the square bolt 40 and the lid 50 are attached.

  As shown in FIG. 9, the bolt 30 has a screw portion 31 and a screw head 32 formed at the tip of the screw portion 31. The shape of the screw head 32 is, for example, hexagonal. That is, a hexagonal bolt is used as the bolt 30. Specifically, the length of the bolt 30 is about 70 mm and the thickness is about 16 mm. The distance between the opposite sides of the screw head 32 is about 24 mm, the diagonal distance is about 27 mm, and the height is about 10 mm. On the other hand, a hexagonal nut is used as the square nut 40 as shown in FIG. Specifically, the height of the square nut 40 is about 14 mm, the distance between opposite sides is about 24 mm, and the diagonal distance is about 27 mm. Further, as shown in FIG. 11, a flat washer (washer) is used as the lid 50. The outer diameter of this flat washer is about 34 mm, the inner diameter is about 19 mm, and the thickness is about 3 mm. In the present embodiment, a commercially available washer is used as the lid 50 instead of manufacturing a dedicated one. The bolt 30, the square nut 40, and the lid 50 are made of high-strength steel and have high strength.

  As shown in FIG. 13, the square nut 40 is inserted into the square nut insertion portion 131 of the first recess 13 from below the base 10. Here, the square nut insertion portion 131 has a shape similar to the shape of the square nut 40, that is, a hexagonal shape in the present embodiment. Of course, the square nut 40 is inserted into the square nut insertion portion 131 such that the center axis thereof is substantially parallel to the center axis of the first hole portion 14. In the present embodiment, the square nut insertion portion 131 is designed so that the square nut 40 does not rotate around its central axis when the square nut 40 is inserted, and that there is a gap between the square nut 40 and the square nut 40. Have been. Specifically, as shown in FIG. 12, the depth of the square nut insertion portion 131 is about 15 mm, its opposite side distance is about 25 mm, and its opposite angle distance is about 28 mm. Thereby, even if the square nut 40 is inserted into the square nut insertion portion 131, the square nut is not firmly fixed and can be easily taken out. That is, the square nut 40 cannot rotate freely in the square nut insertion portion 131, but is loose when the base portion 10 is moved. In the present embodiment, the depth of the lid fitting portion 132 formed below the square nut insertion portion 131 is designed to be smaller than the height of the square nut 40. The lid fitting portion 132 is formed in a substantially cylindrical shape, and has a diameter of about 34 mm, which is the same as the outer diameter of the lid 50, and a depth of about 8 mm. Therefore, when the square nut 40 is accommodated in the first recess 13, as shown in FIG. 13, the first recess 13 has not only a gap in which the square nut 40 can slightly move in the horizontal direction, but also a vertical direction. A gap that can be moved a little is formed.

  In the present embodiment, the operation of accommodating the square nut 40 in the first recess 13 is very simple. First, the worker inserts the square nut 40 into the square nut insertion portion 131 after the base portion 10 has the lower surface thereof facing upward. At this time, the operator does not need to worry, for example, whether or not the center axis of the square nut 40 and the center axis of the first hole portion 14 exactly match. Next, after the worker fits the lid portion 50 into the lid fitting portion 132 using a hammer or the like, and then returns the base portion 10 to a state in which the upper surface thereof faces upward, as shown in FIG. The square nut 40 is housed in the first recess 13. Here, since the depth of the lid fitting portion 132 is shallower than the height of the square nut 40, even when the base portion 10 is in a state where the upper surface thereof faces upward, at least a part of the square nut 40 is in the first concave portion. 13 remain. Thus, the square nut 40 is mounted on the base 10 in a state where the center axis thereof substantially coincides with the center axis of the first hole portion 13 but cannot rotate freely (there is a play state).

  As shown in FIG. 3, the screw portion 31 of the bolt 30 is placed on the cup portion 20 with the cup portion 20 arranged on the base portion 10 so that the second hole portion 22 and the first hole portion 14 coincide with each other. 20 is screwed into the square nut 40 through the second hole 22 and the first hole 14 from the upper surface side. By the way, in the present embodiment, the square nut 40 is mounted on the base 10 in a state where it is not completely fixed as described above, but the bolt 30 can be easily screwed into the square nut 40. For example, even if the square nut 40 is slightly inclined and the center axis of the bolt 30 does not completely coincide with the center axis of the square nut 40, the square nut insertion portion 131 is provided with a play that allows the square nut 40 to move slightly. Therefore, when the bolt 30 is screwed into the square nut 40 through the second hole 22 and the first hole 14 from the upper surface side of the cup part 10, the center axis of the square nut 40 coincides with the center axis of the bolt 30. This is because the movement of the bolt 30 can be followed. Thus, when the bolt 30 is screwed into the square nut 40, the screw head 32 of the bolt 30 is stored in the bolt recess 21.

  Next, a method of attaching the joint of the spread sheet iron for a construction site according to the present embodiment will be described. FIG. 14 is a diagram for explaining a method of attaching the joint of the construction site spread iron plate of the present embodiment. Here, a case where two jointed iron plates are sandwiched and connected using the joint of the present embodiment will be considered. Normally, the size of one laid iron plate is 6 m in length, 1.5 m in width, and 22 mm in thickness, and its weight is 1620 kg. In an actual construction site, a plurality of laid iron plates are laid. In this case, for the adjacent laid iron plates, three joints of the present embodiment are attached to the long side and two to the short side. become.

  In the joint of the present embodiment, a flat washer is used as the lid 50, and a hole is opened in the center of the flat washer, so that the lower side of the first recess 13 is not sealed. For example, if the joint installation location is muddy due to rain, if this joint is used as it is, muddy water will enter the square nut insertion portion 131 through the hole of the flat washer. Can no longer be screwed into the device. Therefore, in the present embodiment, when using the joint, the seal 70 is stuck on the flat washer as shown in FIG. Here, for example, a paper-made seal is used as the seal 70. Thereby, since the lower side of the first recess 13 can be sealed, it is possible to prevent soil and muddy water from entering the first recess 13 from the outside.

  First, the first spread iron plate P1 is lifted by a crane, moved to a predetermined position on a construction site, and lowered to the ground. Next, the operator arranges the base portion 10 near a predetermined end of the spread iron plate P1. Specifically, when the upper surface of the base portion 10 is divided into two surface regions by a straight line connecting the two protrusions 11, 11, one of the two surface regions faces the spread iron plate P <b> 1. The base part 10 is arranged. Then, the worker hits the side surface of the base portion 10 with a hammer to insert the base portion 10 under the spread iron plate P1 as shown in FIG. The projections 11 and 11 and the wall 12 are brought into contact with each other.

  Next, the second spread iron plate P2 is lifted by a crane, and is moved above the base portion 10. Then, the spread iron plate P2 is brought into contact with the side surface portions 110, 110 of the protrusions 11, 11 and the side surface portion 120 of the wall portion 12 in a surface region opposite to the surface region on which the first spread iron plate P1 is placed. Let go down. Thereafter, the spread iron plate P2 is lowered to the ground with the edge of the spread iron plate P2 abutting on the protrusions 11, 11 and the wall portion 12. At this time, the spread iron plate P <b> 2 may be shifted from the protrusions 11, 11 or may be separated from the base 10. In such a case, the worker may insert the burl into the iron plate P2, lift the iron plate, and slide the iron plate so that the iron plate P2 comes into contact with the protrusions 11, 11. Thus, as shown in FIG. 14 (b), the two laid iron plates P1 and P2 are fixed at a constant interval (about 25 mm) with the protrusions 11 and 11 (wall portion 12) of the base portion 10 interposed therebetween. It is arranged with. In this embodiment, since the upper surface of each projection 11 is coated with a paint of a conspicuous color or a paint emitting a fluorescent color, it is easy for an operator to check the positions of the projections 11 even at night. There is an advantage.

  Next, the worker places the cup 20 on the base 10 such that the second hole 22 coincides with the first hole 14, as shown in FIG. At this time, the tip of each pin 24 abuts on the upper surface of either end of the two laid iron plates P1 and P2, and the upper end of each projection 11 has four projection recesses 26, 26, 26,. The direction of the cup portion 20 is adjusted so as to enter below any one of the portions 26. Thereafter, the operator inserts the screw portion 31 of the bolt 30 into the second hole portion 22 from the upper surface side of the cup portion 20. Here, a washer 60 for receiving the lower surface of the screw head 32 is inserted into the screw portion 31 (see FIG. 3). As the washer 60, a spring washer or a flat washer can be used. An operator fits a wrench into the screw head 32 and screws the bolt 30 into the square nut 40 using the wrench. Here, in the joint of the present embodiment, since the square nut 40 is attached to the base 10 in a state in which the square nut 40 is not completely fixed, the center axis of the bolt 30 does not completely coincide with the center axis of the square nut 40. It is possible that. However, even in this case, since the square nut insertion portion 131 is provided with a play for the square nut 40 to move slightly, when the bolt 30 is screwed, the center axis of the square nut 40 is adjusted to the center of the bolt 30. The movement of the bolt 30 can be followed so as to coincide with the axis. Thus, in the joint of the present embodiment, the operation of screwing the bolt 30 into the square nut can be performed without any problem.

  Next, the operator hits the portion of the cup portion 20 provided with each pin 24 from above with a hammer, and lays each pin 24 to bite into the iron plates P1 and P2. Thereafter, the bolt 30 is screwed into the square nut 40 again using a wrench. Here, when the bolt 30 and the square nut 40 are tightened, a tensile load is applied to the base portion 10 by the tightening. In the present embodiment, the base portion 10 is provided with the wall portion 12 and the rib 17, and the base portion 10 is provided. Since the thickness of the central portion of the base 10 is increased, the base 10 can sufficiently withstand the tensile load. In this way, as shown in FIG. 14D, the two spread iron plates P1 and P2 are tightened by the cup portion 20 and the base portion 10, and the tips of the pins 24 bite into the end upper surfaces of the spread iron plates P1 and P2. Therefore, the two spread iron plates P1 and P2 can be firmly connected. When the vehicle or the like travels on the spread iron plates P1 and P2 many times after the joint installation is completed, the base portion 10 sinks to the ground as shown in FIG.

  Note that the joint of the present embodiment can be applied to a location where the corners of the four spread iron plates are gathered. In this case, by placing the cup portion 20 on the base portion 10 such that the four pins 24 respectively abut against another spread iron plate, the joints of the present embodiment can sandwich and connect the four spread iron plates.

  Next, a procedure for replacing the square nut 40 in the joint of the construction site spread iron plate of the present embodiment will be described.

  When the spread iron plate is sandwiched by the joint of the present embodiment, a large tensile load is applied to the square nut 40 by tightening the bolt 30. Therefore, if the joint of the present embodiment is used many times, the screw inside the square nut 40 may be damaged. If the square nut 40 is damaged, the operator must replace the square nut 40. In this replacement work, first, the operator inserts the bolt 30 into the first hole 14 of the base 10 from above the base 10, and screws the tip of the bolt 30 into the square nut 40. Next, the worker hits the screw head 32 of the bolt 30 with a hammer from above. Accordingly, the cover 50 can be pushed out by strongly pressing the square nut 40 against the cover 50, so that the cover 50 can be easily removed from the cover fitting portion 132. When the bolt 30 is removed from the square nut 40, the square nut 40 can be taken out from the base 10. Thereafter, the operator inserts a new square nut 40 into the square nut insertion portion 131 and fits the lid 50 into the lid fitting portion 132 using a hammer or the like. As described above, anyone can easily replace the square nut 40.

  In the joint of the construction site spread iron plate of the present embodiment, the first recess formed in the lower central portion of the base portion has a square nut insertion portion having a shape similar to the shape of the square nut, and a square nut insertion portion. And a lid fitting portion formed on the lower side of the square nut, and the square nut insertion portion prevents the square nut from rotating around its central axis when the square nut is inserted, and includes a square nut. The lid fitting portion is formed to have a depth smaller than the height of the square nut. For this reason, in the joint of the construction site spread iron plate of the present embodiment, the worker inserts the square nut into the square nut insertion portion, then simply fits the lid portion into the lid fitting portion with a hammer or the like. Can be mounted on the base portion, so that the mounting work of the square nut is very easy.

  In addition, in the joint of the construction site spread iron plate of the present embodiment, the lid fitting portion is formed in a substantially cylindrical shape, and a flat washer is used as the lid, so that a commercial product can be used as the lid. In addition, an increase in manufacturing cost can be suppressed.

  Note that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist.

  In the above embodiment, the case where a hexagonal bolt is used as the bolt has been described. However, a bolt having a special screw head shape, for example, a hexagonal bolt may be used. In this case, the bolt cannot be rotated unless a wrench or the like having a special socket for inserting the screw head of the bolt is used, so that the laying iron plate can be prevented from being stolen. An example of such a bolt is the anti-theft bolt according to Japanese Utility Model Registration No. 3202814.

  Further, in the above embodiment, the case where the hexagonal nut is used as the square nut has been described, but a polygonal nut such as a square nut can be used as the square nut. Also in this case, the square nut insertion portion must be designed so that the square nut does not rotate around its central axis when the square nut is inserted, and that there is a gap between the square nut and the square nut.

  Furthermore, in the above embodiment, the case where a flat washer was used as the lid was described.However, as the lid, the mouth of the first recess is closed from below, and the square nut is confined in the first recess. Any shape such as a disk shape or a polygonal shape may be used as long as the shape can be obtained. In this case, the lid fitting portion is formed in substantially the same shape as the lid so that the lid can be fitted. In addition, when a lid having no holes is used, it is not necessary to attach a seal to the flat washer as in the case of using a flat washer as the lid.

  In the above-described embodiment, the case where the lid 50 is fitted into the lid fitting part 132 using a hammer or the like has been described. However, the lid 50 is fitted to the lid fitting part 132 using a dedicated jig. You may make it fit. FIG. 15 is a schematic perspective view of a dedicated jig used when fitting the cover 50 into the cover fitting portion 132. 16A is a schematic side view of a support jig for the dedicated jig, FIG. 16B is a schematic side view of a pusher of the dedicated jig, and FIG. 16C is a schematic plan view of the pusher. It is. FIG. 17 is a diagram for explaining how to use the dedicated jig. The dedicated jig 200 is used when a flat washer is used as the lid 50. The dedicated jig 200 is made of iron, and includes a support 210 for supporting the base 10 and a push 220 for pushing the flat washer with substantially uniform force, as shown in FIG. You. As shown in FIGS. 15 and 16A, the support 210 has a shape similar to a bolt, and has a bottom 211 and a shaft 212. The bottom part 211 is formed in a cylindrical shape. The diameter of the bottom 211 is about 44 mm, and its height is about 10 mm. A shaft portion 212 is integrally formed at the center of the upper surface of the bottom portion 211. The shaft 212 has a diameter of about 12 mm and a length of about 50 mm. That is, the diameter of the shaft portion 212 is slightly smaller than the diameter of the first hole portion 14. On the other hand, the pusher 220 has a main body part 221 and a convex part 222 as shown in FIGS. 15, 16 (b) and 16 (c). The main body 221 is formed in a cylindrical shape, and has a diameter of about 44 mm and a height of about 15 mm. At the center of the upper surface of the main body part 221, a convex part 222 is integrally formed. The shape of the convex portion 222 is substantially the same as the shape of the flat washer used as the lid portion 50. For example, the diameter of the protrusion 222 is about 34 mm, and its height is about 2 mm. The pusher 220 has a through hole 223 formed along the center axis thereof. The diameter of the through hole 223 is about 17 mm.

  When the work of fitting a flat washer to the lid fitting part 132 using the special jig 200 is performed, first, the first hole part 14 of the base part 10 is placed with the bottom surface of the base part 10 facing up. By passing through the shaft 212, the base 10 is supported by the support 210 as shown in FIG. At this time, the shaft portion 212 protrudes outside from the first concave portion 13. Next, as shown in FIG. 17B, the flat washer (lid portion 50) is passed through the shaft portion 212, and the flat washer is disposed on the lid fitting portion 132. Then, by passing the through hole 223 of the pusher 220 through the shaft portion 212 with the convex portion 222 facing downward, as shown in FIG. 17C, the flat washer and the convex portion 222 of the pusher 220 are formed. Relative to each other. Finally, when the upper surface of the main body portion 221 of the pusher 220 is hit with a hammer, the surface of the flat washer receives a substantially uniform force from the convex portion 222 of the pusher 220 and is properly fitted into the lid fitting portion 132. . By using such a dedicated jig 200, the work of fitting a flat washer as the lid 50 can be easily performed, and the flat washer can be easily fitted to the lid fitting portion 132 in a substantially horizontal state. Can be included.

  Further, in the above-described embodiment, the case where the gauge groove 29 is formed at the peripheral end of the bolt recess on the upper surface of the cup portion has been described. However, the position at which the gauge groove 29 is formed is the peripheral end of the bolt recess. The position is not limited to the portion, and may be any position as long as it is the upper surface of the cup portion. In the above embodiment, the case where the gauge groove 29 is formed in a ring shape has been described, but the shape of the gauge groove 29 is not limited to this. For example, the gauge groove 29 may be a groove whose planar shape is a substantially square shape, a substantially circular shape, a substantially star shape, or the like. Further, in the above-described embodiment, the case where the slip stopper groove 28 and the gauge groove 29 are formed on the upper surface of the cup portion has been described, but only one of the groove 28 and the gauge groove 29 is provided. You may do so. In this case, the groove provided can also play the role of the groove not provided. Note that both the groove 28 and the gauge groove 29 can be omitted.

  As described above, in the joint of the spread iron sheet for construction sites of the present invention, the first concave portion formed in the lower central portion of the base portion has a square nut insertion portion for inserting a square nut, and a square nut insertion portion. And a cover fitting portion formed on a lower side of the portion, wherein the square nut insertion portion prevents the square nut from rotating around its central axis when the square nut is inserted, and The cover fitting portion is formed to have a depth smaller than the height of the square nut. For this reason, after inserting the square nut into the square nut insertion part, the operator can mount the square nut on the base part simply by fitting the lid part into the lid fitting part with a hammer or the like. Mounting work is very easy. Therefore, the joint of the present invention is suitable for use as a fastener for firmly fixing a laid iron plate laid at a construction site.

DESCRIPTION OF SYMBOLS 10 Base part 11 Projection part 110 Side part 12 Wall part 120 Side part 13 First recess 131 Square nut insertion part 132 Lid fitting part 14 First hole 17 Rib 20 Cup part 21 Bolt recess 22 Second hole 23 Hole (second recess)
24 pin 24a pin lower 24b pin upper 25 through hole 26 projection recess 27 punching 28 groove 29 gauge groove 30 bolt 31 screw part 32 screw head 40 square nut 50 lid part 60 washer 70 seal 200 special jig 210 support Tool 211 Bottom part 212 Shaft part 220 Push tool 221 Body part 222 Convex part 223 Through hole

Claims (2)

A joint for a construction site spread iron plate used to sandwich and connect at least two spread iron plates,
It is formed in a substantially disk shape, and a protrusion formed so as to protrude from the upper surface at a position equidistant to both sides from the center position of the upper surface and a second protrusion formed at the lower central portion. A concave portion, and a base portion having a first hole portion formed so as to penetrate a central portion on the upper surface of the first concave portion,
A cup portion having a second hole formed so as to penetrate a center portion thereof, which is formed in a substantially disk shape,
A square nut housed in the first recess from the lower side of the base,
A lid that is fitted into the first recess from the lower surface side of the base portion so as to store the square nut in the first recess,
When the cup portion is placed on the base portion so that the second hole portion coincides with the first hole portion, the first through the second hole portion and the first hole portion from the upper surface side of the cup portion. A bolt for screwing into the square nut housed in the recess,
With
The first recess includes a square nut insertion part for inserting the square nut, and a lid fitting part formed on the lower side of the square nut insertion part for fitting the lid. The square nut insertion portion is formed so that when the square nut is inserted, the square nut does not rotate around its central axis and has a gap with the square nut, The lid fitting portion is formed so that the depth thereof is shallower than the height of the square nut, and the square nut is inserted from the lid fitting portion into the square nut insertion portion. Joints for laying iron plates for construction sites. The joint according to claim 1, wherein the cover fitting portion is formed in a substantially cylindrical shape, and a flat washer is used as the cover.

Images