JP2018178369A - Joint of laying iron plate for construction site - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint of iron plate for construction site that can reduce frequency of base part replacement and save resources.SOLUTION: A nut mounting recess 13 is formed in the center of a lower side of a base part 10. A first hole part 14 is formed to pass through a central part of a base part 10 on the upper surface of the nut mounting recess part 13. A nut 40 is replaceably fitted in the nut mounting recess 13 from the lower surface side of the base portion 10. For example, in the case of using a seating nut having a washer portion 41 as the nut 40, the nut 40 is fitted into the nut mounting recess 13 from the lower surface side of the base part 10 with its washer part 41 facing downward. When a cup part 20 is put on the base part 10, a bolt 30 is screwed into the nut 40 from the upper surface side of the cup part 20 via a second hole part 22 and the first hole part 14.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a joint of a construction site sheet iron plate used for sandwiching and connecting at least two sheeting sheets.

  In general, in construction sites, laid iron plates are used to secure material loading paths and cure the work area. In recent years, as a joint which fixes laying iron plates, what was described, for example in patent documents 1 is used widely. The joint comprises a cup portion which is an upper plate, a base portion which is a lower plate, four pins and a bolt. A through hole is formed in the central portion of the cup portion and the base portion. The through hole of the base portion is screwed using a tap. Each pin is provided on the bottom of the cup. After sandwiching adjacent laying iron plates from above and below by the cup portion and the base portion, a bolt is inserted into the through hole of the cup portion and screwed into a screw erected in the through hole of the base portion. Thus, since the cup portion and the base portion firmly hold the laying iron plate and the pins bite into the laying iron plate, it is possible to reliably prevent the vertical deviation or the lateral deviation of the laying iron plate.

JP 2000-352124 A

  In the conventional joint, the cup portion and the base portion are cast, while the bolt used is a high strength steel made of high tension steel. When a bolt is tightened, a tensile load is applied to the screw of the base portion by tightening the bolt, but since the base portion is weaker in strength than the bolt, the screw of the base portion is easily damaged. For this reason, conventionally, every time the screw is damaged, the entire base portion has to be replaced, resulting in a problem of a lot of waste.

  The present invention is made based on the above-mentioned situation, and an object of the present invention is to provide a joint of a laying iron plate for construction site which can reduce the frequency of replacing the base portion and save resources.

  The present invention for achieving the above object is a joint of a construction site sheet iron plate used for sandwiching and connecting at least two spread sheet irons, which is formed in a substantially disc shape (1) The projection formed so as to project from the upper surface at equally spaced positions from the center position of the upper surface to the both sides, the first recess formed in the lower center portion, and the upper surface of the first recess A base portion having a first hole portion formed to penetrate the central portion, and (2) a substantially circular disc shape, and a second hole formed to penetrate the central portion And a second recess formed at a predetermined distance from the center position of the lower surface in the front-rear and left-right directions, and a metal fitted in the second recess so that a substantially conical tip protrudes from the lower surface (3) from the lower surface side of the base portion The second hole from the upper surface side of the cup portion when the cup portion is covered on the base portion so that the nut, which is exchangeably fitted in one recess, and the second hole portion coincides with the first hole portion And a bolt for screwing into the nut through the first hole.

  In the joint of the laying iron plate for construction site according to the present invention, when the first recess is formed in the lower central portion of the base portion and the nut is replaceably fitted in the first recess, the nut is damaged, Since the damaged nut can be replaced with a new one, it is not necessary to replace the entire base portion, and resources can be saved.

  Further, in the joint of the laying iron plate for construction site according to the present invention, a nut with a seat having a washer is used as a nut, and the nut is fitted into the first recess from the lower surface side of the base with the washer facing downward. Is desirable. As described above, by using a nut with a seat as a nut, after inserting a laying iron plate between the base portion and the cup portion, when screwing a bolt into the nut and tightening the base portion and the cup portion with the bolt and the nut, Since the nut can receive a tensile load due to tightening of the bolt at the washer, it can be avoided that the nut is drawn into the first hole of the base.

  Further, in the joint of the laying iron plate for construction site according to the present invention, when the upper surface of the base portion is divided into two surface regions by a straight line connecting the two projecting portions, a predetermined location of one of the two surface regions. Preferably, the magnet is fixed so that its surface does not protrude from the upper surface of the base. Thereby, after the first spread iron plate is laid on the ground, when inserting the base portion under the spread iron plate, the base portion is disposed so that the surface area to which the magnet is fixed is positioned below the spread iron plate A magnet can be attached to the sheeting to secure the base to the sheeting. Therefore, for example, even in the case of laying an iron plate on a soft ground, the base inserted into the lower portion of the first laying iron does not sink into the soft ground, so the present invention Installation of joints can be easily performed.

  Furthermore, in the joint of the laying iron plate for construction site according to the present invention, it is desirable to form a wall lower than the protrusions integrally with the two protrusions between the two protrusions. By providing the wall portion in this manner, the portion of the base portion corresponding to the first hole portion becomes thicker, and the strength of the portion can be improved, so even with the bolt and the nut, the base portion and the cup portion Even if it is tightened with a stronger force, the base and the nut can sufficiently bear the tensile load due to the tightening of the nut.

  In the joint of the laying iron plate for construction site according to the present invention, when the first recess is formed in the lower central portion of the base portion and the nut is replaceably fitted in the first recess, the nut is damaged, Since only the damaged nut can be replaced with a new one instead of replacing the entire base, the frequency of replacement of the base can be reduced and resources can be saved.

FIG. 1 is a schematic perspective view of a joint of a laying iron plate for construction site according to an embodiment of the present invention. Fig.2 (a) is a schematic plan view of the joint of the laying iron plate for construction sites of this embodiment, FIG.2 (b) is a schematic side view of the joint of the laying iron plates for the construction site. FIG. 3 is a schematic cross-sectional view in the direction of arrows AA of the joint of the flat sheet for construction site of the present embodiment. Fig.4 (a) is a schematic plan view of the base part in the joint of the laying iron plate for construction sites of this embodiment, FIG.4 (b) is a schematic side view of the base part. Fig.5 (a) is a schematic bottom view of the base part shown in FIG. 4, FIG.5 (b) is a BB arrow directional schematic cross section of the base part. Fig.6 (a) is a schematic plan view of the cup part in the joint of the laying iron plate for construction sites of this embodiment, FIG.6 (b) is a schematic side view of the cup part. Fig.7 (a) is a schematic bottom view of the cup part shown in FIG. 6, FIG.7 (b) is the CC arrow directional schematic cross section of the cup part. FIG. 8 is a schematic side view of a pin at a joint of a laying iron plate for a construction site according to the present embodiment. Fig.9 (a) is a schematic perspective view of the bolt in the joint of the laying iron plate for construction sites of this embodiment, FIG.9 (b) is a schematic plan view of the bolt, and FIG.9 (c) is a schematic side view of the bolt. is there. Fig.10 (a) is a schematic perspective view of the nut in the joint of the laying iron plate for construction sites of this embodiment, FIG.10 (b) is a schematic plan view of the nut, and FIG.10 (c) is a schematic side view of the nut. is there. FIG. 11 is a figure for demonstrating the attachment method of the joint of the laying iron plate for construction sites of this embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a joint of a laying iron plate for construction site according to an embodiment of the present invention. Fig.2 (a) is a schematic plan view of the joint of the laying iron plate for construction sites of this embodiment, FIG.2 (b) is a schematic side view of the joint of the laying iron plates for the construction site. FIG. 3 is a schematic cross-sectional view in the direction of arrows AA of the joint of the flat sheet for construction site of the present embodiment.

  The joint of the laying iron plate for construction site of the present embodiment (hereinafter, also simply referred to as a joint) is used to sandwich and connect at least two laying iron plates, as shown in FIGS. 1 to 3, A base portion 10 for mounting an end portion of a laying iron plate to be connected, a cup portion 20 disposed so as to cover the base portion 10 from above, a bolt 30 and a nut 40 for connecting the base portion 10 and the cup portion 20 And

  First, the base unit 10 will be described. Fig.4 (a) is a schematic plan view of the base part 10 in the joint of the laying iron plate for construction sites of this embodiment, FIG.4 (b) is a schematic side view of the base part 10. As shown in FIG. FIG. 5A is a schematic bottom view of the base portion 10, and FIG. 5B is a schematic cross-sectional view of the base portion 10 in the direction of arrows B-B. The base portion 10 is made of a metal formed in a substantially disc shape. As shown in FIG. 1, FIG. 3, FIG. 4 and FIG. 5, the base portion 10 is formed between two protrusions 11 and 11 formed at predetermined positions on the upper surface thereof and the two protrusions 11 and 11. The wall portion 12 formed, the nut mounting recess (first recess) 13 for mounting the nut 40, and the first hole portion 14 formed to penetrate the central portion of the base portion 10; It has magnets 15 and 15. In the present embodiment, the base portion 10 is integrally formed of, for example, a casting except for the magnets 15 and 15.

  The diameter of the base 10 is about 140 mm. As shown in FIGS. 4B and 5A, three ribs 17, 17 and 17 are formed on the lower surface of the base portion 10. As shown in FIG. In the present embodiment, these ribs 17, 17 and 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 among them. The thickness of the base 10 including the ribs 17 is about 18 mm. On the other hand, as shown in FIG. 4, two protrusions 11 and 11 are formed on the upper surface of the base 10. The protrusions 11 and 11 are formed to project from the upper surface of the base 10 at positions equally spaced on both sides from the central position of the upper surface of the base 10. Each projection 11 has tapered sides 110, 110 which are used to position the sheeting to be cut. The height of the projection 11 is about 28 mm. Moreover, the horizontal width in the bottom face of the projection part 11 is about 27 mm. On the upper surface of each protrusion 11, a paint of a noticeable color or a paint emitting a fluorescent color is applied.

  Further, in the present embodiment, the wall 12 having a height smaller than that of the protrusion 11 is provided between the two protrusions 11 and 11. The wall 12 is integrally formed with the two protrusions 11 and 11. Specifically, the height of the wall 12 is about 20 mm. Therefore, the thickness of the central portion of the entire base portion 10 is about 38 mm. The side surfaces 120, 120 of the wall 12 are also tapered in the same manner as the side surfaces 110, 110 of the projection 11, and the tapers of the side surfaces 120, 120 of the wall 12 are also positioned when positioning the iron plate. It can be used. The side surfaces 110 and 110 of the projection 11 and the side surfaces 120 and 120 of the wall 12 are integrally formed to be continuous with each other.

  The nut mounting recess 13 is formed at the lower central portion of the base portion 10 as shown in FIGS. 3 and 5. The shape of the nut mounting recess 13 is substantially the same as the shape of the nut 40 so that the nut 40 can be fitted. The first hole portion 14 is for passing the bolt 30, and is formed to penetrate the central portion of the base portion 10 (the wall portion 12) on the upper surface of the nut mounting recess 13. Specifically, the diameter of the first hole 14 is about 17 mm.

  As shown in FIGS. 1 and 4 (a), when the upper surface of the base 10 is divided into two surface areas by the straight line connecting the two protrusions 11, as shown in FIGS. It is provided on one of the surface areas. Specifically, two stepped portions 16 with a predetermined depth are formed at predetermined positions in the one surface area, and the magnet 15 is inserted in each of the stepped portions 16. The magnet 15 is fixed by screws 18. This is to prevent the magnet 15 from being lost. Here, the depth of the step portion 16 is such that the magnet 15 does not protrude from the upper surface of the base portion 10. In fact, a screw hole 19 is formed at the center of the bottom of each step portion 16, and the magnet 15 is fixed to the base portion 10 by screwing the screw 18 into the screw hole 19 via the magnet 15. In the present embodiment, neodymium φ18 mm × φ4.3 mm × 5 mm / M4 manufactured by Magfine Co., Ltd. is used as the magnet 15.

  In the present embodiment, the magnet 15 is fixed by the screw 18, but the method of fixing the magnet 15 is not limited to this. For example, through holes may be formed in the magnet 15 and the cup portion 20 respectively, and the magnet 15 may be fixed to the cup portion 20 by inserting a rivet into the through holes and caulking with a dedicated tool. . Thereby, since the process of cutting a screw can be omitted, the manufacturing cost can be reduced. In addition, when the magnet 15 needs to be replaced, there is an advantage that the rivet can be easily removed by scraping the head or caulking portion of the rivet with a sander or the like.

  Next, the cup unit 20 will be described. Fig.6 (a) is a schematic plan view of the cup part 20 in the joint of the laying iron plate for construction sites of this embodiment, FIG.6 (b) is a schematic side view of the cup part 20. As shown in FIG. Fig.7 (a) is a schematic bottom view of the cup part shown in FIG. 6, FIG.7 (b) is the CC arrow directional schematic cross section of the cup part. The cup portion 20 is made of metal formed in a substantially disc shape. As shown in FIGS. 1 to 3 and FIGS. 6 and 7, the cup portion 20 is formed so as to penetrate the bolt recess 21 formed in the upper central portion and the central portion of the cup portion 20. The second holes 22; four holes (second recesses) 23 formed at predetermined positions on the lower surface of the cup 20; and four metal pins 24 fitted in the holes 23. Have. In the present embodiment, the base portion 10 is integrally formed of, for example, a casting except for the pin 24. The pin 24 is made of steel.

  The peripheral end 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 cup 20 has a diameter of about 125 mm and a thickness of about 25 mm. However, in general, the diameter of the cup 20 may be the same as or larger than the diameter of the base 10. Further, the second hole portion 22 is for passing the screw portion of the bolt 30 and is formed to penetrate the central portion of the cup portion 20 at the bottom surface of the bolt recess 21. 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 40 mm, and the diameter of the second hole 22 is about 18 mm. The bolt recess 21 serves to store the screw head formed on the top of the bolt 30. Therefore, the diameter of the bolt recess 21 is designed to be large enough to fit a wrench on the screw head of the bolt 30 stored in the bolt recess 21.

  As shown in FIG. 7A, the steel pins 24, 24, 24, and 24 are obliquely upward left, upward, right, downward, and downward right from the center position of the lower surface of the cup portion 20. At predetermined intervals in the direction, in the present embodiment, they are provided at equal intervals. Specifically, the position where the pin 24 is provided is about 50 mm away from the central position of the cup portion 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. As shown in FIG. 7B, a hole (second recess) 23 for inserting an end of the substantially cylindrical pin 24 is formed at a predetermined position on the lower surface of the cup 20. There is. After the end of the substantially cylindrical pin 24 is fitted in the hole 23, as shown in FIG. 7A, the punch 27 is punched in three places of the cup 20 around the pin 24. By applying, the said pin 24 is firmly fixed to the cup part 20. As shown in FIG. At this time, as shown in FIG. 6B, the tip of the substantially conical pin 24 protrudes about 4 mm below the lower end surface of the cup portion 20. A through hole 25 is formed on the upper side of the hole 23 into which the pin 24 is fitted. The through hole 25 is used when removing the pin 24.

  Here, the pin 24 used in the present embodiment will be described in detail. FIG. 8 is a schematic side view of the pin 24 at the joint of the floor plate for construction site of the present embodiment. The pin 24 includes a pin lower portion 24a formed in a substantially conical shape and a pin upper portion 24b formed in a substantially cylindrical shape. The length of the pin upper portion 24b is about 9.3 mm, and the length of the entire pin is about 14 mm. The half apex angle of the lower pin portion 24a is about 46 degrees. The diameter of the pin upper portion 24b is about 9.6 mm, and a step of about 0.17 mm is provided between the pin upper portion 24b and the pin lower portion 24a. Furthermore, the upper surface of the pin upper portion 24b is chamfered at about 30 degrees.

  When using the joint, the cup portion 20 is hit with a hammer to lay the pin 24 and pierce the iron plate. However, in the conventional joint, a pin having a total length of about 13 mm, a diameter of an upper portion of the pin of about 9 mm, and a half apex angle of a lower portion of the pin of about 45 degrees is used. When such a pin is used, there is a problem that the pin sticks too much to the laying iron plate and the tip of the pin is easily chipped. In this embodiment, by using the pin 24 whose half lower apex half angle is about 1 degree larger than that of the conventional pin, the tip of the pin 24 is chipped during the operation of piercing the iron plate with the pin 24 Can be reduced. Further, in the present embodiment, the strength of the pin 24 is improved by using the pin 24 which is about 1 mm longer in the entire length of the pin than the conventional pin and about 0.6 mm in diameter at the top of the pin. be able to.

  Further, a hole (second recess) 23 for inserting the pin upper portion 24b is formed on the lower surface of the cup portion 20, and this hole 23 is manufactured by a drill having a tip of 30 degrees in taper. It is done. The conventional pin has not been chamfered around its upper surface, so when the conventional pin is fitted into the hole 23, the upper tapered portion of the hole 23 and the upper surface of the pin There was a large gap between the Therefore, when the cup portion 20 is hit with a hammer and the pin is pierced and pierced into the iron plate, there is a problem that the pin sinks into the upper tapered portion of the hole 23 due to the impact load. In the present embodiment, as described above, by chamfering the periphery of the upper surface portion of the pin upper portion 24b to about 30 degrees, the shape of the upper tapered portion of the hole 23 and the shape of the upper surface portion of the pin upper portion 24b are Since they coincide with each other, when the pin 24 is fitted into the hole 23, the upper tapered portion of the hole 23 and the upper surface of the pin upper portion 24b are in close contact with each other so that no gap is generated therebetween. be able to. Therefore, it is possible to effectively prevent the pin 24 from being sunk when laying the pin 24 in the iron plate.

  Further, as shown in FIG. 7A, in the lower surface of the cup portion 20, between the pins 24 adjacent to each other, the projection concave portions 26, 26, 26, 26 such that the upper end portions of the projections 11 and 11 can enter. Is formed. By forming the four projection recesses 26, 26, 26, 26 in this manner, the weight of the cup 20 can be reduced.

  Furthermore, as shown in FIG. 1, FIG. 2 (a), FIG. 3, FIG. 6 (a) and FIG. 7 (b), on the upper surface of the cup portion 20, a circular groove centered on the center 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 0.5 mm. The groove 28 plays a role of anti-slip when it rains. Further, a gage groove 29 is formed at the peripheral end of the bolt recess 21 on the upper surface of the cup portion 20. When a car or the like passes over the joint of the present embodiment many times, the upper surface of the cup portion 20 wears gradually, and eventually the upper surface of the cup portion 20 becomes flush with the screw head of the bolt 30. After that, if the joint is continued to be used, the screw head of the bolt 30 may be damaged or broken. In order to avoid this, in the present embodiment, the usage limit of the cup portion 20 is determined using the gutter groove 29. That is, the depth of the gage groove 29 is set in advance to a predetermined value such that the bottom of the gage groove 29 is positioned above the screw head of the bolt 30. Then, the user regularly monitors the gage groove 29 while using the joint, and changes the cup portion 20 when it is determined that the gage groove 29 has worn out and disappeared.

  In the present embodiment, the base portion 10 and the cup portion 20 are subjected to surface treatment of unichrome plating.

  Next, the bolt 30 and the nut 40 will be described. FIG. 9 (a) is a schematic perspective view of a bolt 30 at a joint of a laying iron plate for a construction site according to this embodiment, FIG. 9 (b) is a schematic plan view of the bolt 30, and FIG. It is a side view. FIG. 10 (a) is a schematic perspective view of a nut 40 at a joint of a laying iron plate for a construction site according to this embodiment, FIG. 10 (b) is a schematic plan view of the nut 40, and FIG. It is a side view.

  The bolt 30 has a screw portion 31 and a screw head 32 formed at the tip of the screw portion 31, as shown in FIG. The shape of the screw head 32 is, for example, a hexagon. That is, a hexagonal bolt is used as the bolt 30. Specifically, the length of the bolt 30 is about 70 mm. The screw head 32 has a diameter of about 27 mm and a height of about 10 mm. On the other hand, a nut with a seat is used as the nut 40, as shown in FIG. That is, a washer 41 is formed at one end of the nut 40. The diameter of the nut 40 is about 27 mm, and the diameter of the washer 41 is about 33 mm. As the bolt 30 and the nut 40, high strength steel made of high tension steel is used.

  As shown in FIG. 3, the nut 40 is replaceably fitted to the nut mounting recess 13 from the lower surface side of the base portion 10. The nut 40 fitted in the nut mounting recess 13 is integral with the base portion 10 and does not move freely or come off. Specifically, in the present embodiment, the nut 40 is fitted into the nut mounting recess 13 from the lower surface side of the base portion 10 with the washer portion 41 directed downward. Therefore, when the nut 40 is damaged or the like, the nut 40 can be easily replaced by the method described later. The screw portion 31 of the bolt 30 is a cup portion in a state where the cup portion 20 is disposed on the base portion 10 so that the second hole portion 22 and the first hole portion 14 coincide with each other as shown in FIG. It is screwed into the nut 40 from the upper surface side of 20 through the second hole 22 and the first hole 14. Thus, when the bolt 30 is screwed into the nut 40, the screw head 32 of the bolt 30 is stored in the bolt recess 21.

  Next, the method of attaching the joint of the laying iron plate for construction site of the present embodiment will be described. FIG. 11 is a figure for demonstrating the attachment method of the joint of the laying iron plate for construction sites of this embodiment. Here, a case is considered where two spread iron plates are sandwiched and connected using the joint of the present embodiment. Usually, the size of a single laying iron plate is 6 m long, 1.5 m wide, and 2.2 mm thick, and its weight is 1620 kg. In an actual construction site, a plurality of laying iron plates will be laid, but in this case, for the adjacent laying iron plates, three joints of this embodiment are attached to the long side and two joints to the short side. become.

  First, the first laying iron plate P1 is lifted by a crane, moved to a predetermined position on the construction site, and lowered to the ground. Next, the worker arranges the base portion 10 near the predetermined end of the laying iron plate P1. At this time, the base portion 10 is disposed such that the surface area to which the magnets 15 and 15 are fixed faces the laying iron plate P1. Then, the worker strikes the side surface of the base portion 10 with a hammer to insert the base portion 10 under the iron plate P1 as shown in FIG. The protrusions 11 and 11 and the wall 12 are brought into contact with each other. As a result, since the magnets 15 and 15 are attached to the laying iron plate P1, the base portion 10 can be laid and fixed firmly to the ironing plate P1.

  Next, the second laying iron plate P2 is lifted by a crane and moved to the upper side of the base portion 10. Then, the laying iron plate P2 is brought into contact with the side surfaces 110, 110 of the protrusions 11 and 11 and the side surface 120 of the wall 12 in the surface region opposite to the surface region on which the first laying iron plate P1 is placed. Let down. Thereafter, the laying iron plate P2 is brought down to the ground while keeping the end edge of the laying iron plate P2 in contact with the protrusions 11, 11 and the wall portion 12. At this time, the laying iron plate P2 may be displaced from the protrusions 11 and 11 or separated from the base portion 10. In such a case, the worker may insert a bar into the iron plate P2 to lift and slide the iron plate so that the laying iron plate P2 abuts on the projections 11. In the present embodiment, the magnet 15 is provided only in one of the two surface areas of the base portion 10, which is to allow the position of the second laying iron plate P2 to be easily adjusted. . That is, if a magnet is provided on any of the two surface areas of the base, even if it is attempted to shift the position of the second spread iron plate P2, the magnet is attached to the spread iron plate P2, so the spread iron plate P2 It will be difficult to shift the Thus, as shown in FIG. 11B, the two laying iron plates P1 and P2 are disposed at a constant interval (about 27 mm) with the protrusions 11 of the base portion 10 interposed therebetween. In the present embodiment, the upper surface of each protrusion 11 is coated with a paint of a noticeable color or a paint that emits a fluorescent color, so it is easy for the operator to check the positions of the protrusions 11 and 11 even at night. It has the advantage of

  Next, the worker covers the cup portion 20 on the base portion 10 so that the second hole portion 22 matches the first hole portion 14 as shown in FIG. At this time, the upper end of each protrusion 11 has four protrusion recesses 26, 26, 26, so that the tip end of each pin 24 abuts on the upper surface of either end of the two laying iron plates P1 and P2. The orientation of the cup portion 20 is adjusted so as to enter any one of the lower portions 26. Thereafter, the worker 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 50 for receiving the lower surface of the screw head 32 is inserted in the screw portion 31 (see FIG. 3). As the washer 50, a spring washer or a flat washer can be used. The operator inserts a wrench into the screw head 32 and uses the wrench to screw the bolt 30 into the nut 40.

  Next, the worker strongly strikes from above the portion of the cup portion 20 provided with the pins 24 with a hammer to lay the pins 24 into the iron plates P1 and P2. Thereafter, the bolt 30 is screwed into the nut 40 again using a wrench. Here, when the bolt 30 is tightened, a tensile load is applied to the nut 40 by tightening the bolt 30, but in the present embodiment, the wall portion 12 and the rib 17 are provided on the base portion 10 Since the thickness of the base 10 is thick, the base 10 can sufficiently withstand the tensile load. Moreover, in the present embodiment, by using the seat nut as the nut 40, the tensile load due to the tightening of the bolt 30 can be received by the washer portion 41 of the nut 40. It is possible to avoid the occurrence of a situation in which it gets stuck. Thus, as shown in FIG. 11 (d), the two spread iron plates P1 and P2 are tightened by the cup portion 20 and the base portion 10 and the tip of each pin 24 bites into the upper surface of the end portions of the spread iron plates P1 and P2. As it becomes, it is possible to firmly connect the two laying iron plates P1 and P2. When the vehicle or the like travels on the laying iron plates P1 and P2 many times after the completion of the attachment of the joints, as shown in FIG. 11 (d), the base portion 10 sinks to the ground.

  By the way, on the next day when it rains, etc., the ground on which the laying iron plate is laid may be weak. Even in such a situation, in the present embodiment, by providing the magnets 15 and 15 in the base portion 10, when the base portion 10 is inserted under the first spread iron plate, the magnets 15 and 15 stick to the spread iron plate , The base portion 10 is firmly fixed to the floor plate. On the other hand, in the conventional joint, since the magnet is not provided in the base portion, when the base portion is inserted under the first spread iron plate, the base portion sinks to the ground, and the surface of the base portion and the spread iron plate There is a gap between the In addition, when the sheet iron plate is brought down to the ground while the end of the second sheet iron sheet is in contact with the projection, the base portion further sinks to the ground. In this case, when carrying out the mounting operation of the cup portion and the tightening operation of the bolt, the operator must, for example, insert a burl under the base portion to lift the base portion, and the workability is very bad. In the joint of the present embodiment, by providing the magnets 15 and 15 in the base portion 10, the base portion 10 can be fixed to the first spread iron plate, and thus such a problem does not occur. Also, in the case where there is a cavity below the position where the base is to be placed in the first laying iron plate, the conventional joint can not even place the base in the first place, but the joint of this embodiment uses a magnet Since the base portion can be fixed to the laying iron plate, the two laying iron plates can be easily sandwiched and connected even in such a situation.

  In addition, it is also possible to apply the joint of this embodiment to the location where the corner part of four laying iron plates gathers. In this case, by placing the cup portion 20 on the base portion 10 so that the four pins 24 respectively abut on another laying iron plate, the four laying iron plates can be sandwiched and connected by the joint of the present embodiment.

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

  As described above, when the laying iron plate is sandwiched by the joint of the present embodiment, a large tensile load is applied to the nut 40 due to the tightening of the bolt 30. For this reason, when the joint of this embodiment is used many times, the screw inside nut 40 may be damaged. If the nut 40 is damaged, the operator will carry out the replacement work of the nut 40. In this replacement operation, first, the operator inserts the bolt 30 into the first hole portion 14 of the base portion 10 from the upper surface side of the base portion 10 and screws the bolt 30 into the nut 40. Next, the worker strongly strikes the screw head 32 of the bolt 30 with a hammer from above, and pushes the nut 40 out of the base portion 10. Thereafter, a new nut 40 is press-fit into the nut mounting recess 13 from the lower surface side of the base portion 10 with the washer portion 41 directed downward. In this way, anyone can easily replace the nut 40.

  In the joint of the laying iron plate for construction site of the present embodiment, when the nut is damaged by providing the nut mounting recess in the base portion and replacing the nut with the nut mounting recess so as to be replaceable, the damaged nut Can be replaced with a new one, so that it is not necessary to replace the entire base, and resources can be saved.

  In addition, in the joint of the laying iron plate for a construction site of the present embodiment, a nut with a seat having a washer is used as a nut, and the nut is directed downward from the bottom of the base with the washer facing downward. It is fitted at the bottom. As a result, after the sheet iron is sandwiched between the base portion and the cup portion, the bolt is screwed into the nut, and when the base portion and the cup portion are tightened with the bolt and nut, the nut is a washer Since the parts can be received, it is possible to avoid the occurrence of a situation in which the nut is drawn into the first hole of the base part.

  Further, in the joint of the laying iron plate for a construction site of the present embodiment, when the upper surface of the base portion is divided into two surface regions by a straight line connecting two projecting portions, a predetermined one of the two surface regions is selected. At the places, the magnet is fixed so that its surface does not protrude from the upper surface of the base. Thereby, after the first spread iron plate is laid on the ground, when inserting the base portion under the spread iron plate, the base portion is disposed so that the surface area to which the magnet is fixed is positioned below the spread iron plate A magnet can be attached to the sheeting to secure the base to the sheeting. For this reason, for example, even when laying an iron plate on a soft ground, the base inserted into the lower portion of the first laying iron does not sink into the soft ground, so this embodiment The mounting operation of the joint of the form can be easily performed. In addition, even when the lower side of the position where the base portion is placed is hollow, the base portion can be laid and fixed to the iron plate using a magnet, so the joint attachment operation of this embodiment can be easily performed. Can.

  Furthermore, in the joint of the laying iron plate for a construction site of the present embodiment, the first hole portion is formed by integrally forming the wall portion having a height lower than the protrusion portion between the two protrusion portions. Of the base portion corresponding to the thickness of the base portion, and the strength of the portion can be improved. Therefore, even if the base portion and the cup portion are tightened with a bolt and a nut with a stronger force, the base portion and the nut Can sufficiently withstand the tensile load by tightening the nut.

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

  In the above embodiment, the hexagonal bolt is used as the bolt. However, as the bolt, a screw head having a special shape, for example, a seven-sided bolt may be used. In this case, the bolt can not be rotated unless a wrench or the like having a dedicated special socket for inserting the screw head of the bolt is used, so that the theft of the laying iron plate can be prevented. As an example of such a bolt, an antitheft bolt according to utility model registration 3202814 can be mentioned.

  Moreover, although the above-mentioned embodiment demonstrated the case where two magnets were provided in the base part, you may make it provide one magnet or three or more magnets in a base part. Furthermore, the base does not necessarily have to be provided with a magnet.

  Although the above embodiment describes the case where the gage groove 29 is formed at the peripheral end of the bolt recess on the upper surface of the cup portion, the position where the gage groove 29 is formed is at the peripheral end of the bolt recess. There is no limitation, and it may be at any position on the upper surface of the cup portion. Moreover, although said embodiment demonstrated the case where the groove | channel 29 for gauges was formed in ring shape, the shape of the groove | channel 29 for gauges is not restricted to this. For example, the gage 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. Furthermore, in the above embodiment, although the case where the slip preventing groove 28 and the gage groove 29 are formed on the upper surface of the cup portion has been described, only one of the groove 28 and the gage groove 29 is provided You may do so. In this case, the groove provided can also play the role of the groove not provided. In addition, it is also possible to omit both the groove 28 and the groove 29 for gauges.

  As described above, in the joint of the laying iron plate for a construction site according to the present invention, the first recess is formed in the lower central portion of the base portion, and the nut is fitted replaceably in the first recess. In the event of damage, instead of replacing the entire base portion, only the damaged nut can be replaced with a new one, so the frequency of replacement of the base portion can be reduced and resource saving can be achieved. Therefore, the joint of the present invention is suitable for use as a fastener for securing a laying sheet laid at a construction site.

DESCRIPTION OF SYMBOLS 10 base part 11 protrusion part 110 side part 12 wall part 120 side part 13 recessed part for 1st nut installation (first recessed part)
14 first hole 15 magnet 16 step 17 rib 18 screw 19 screw hole 20 cup 21 recess for bolt 22 second hole 23 hole (second recess)
24 pin 24a pin lower portion 24b pin upper portion 25 through hole 26 recessed portion for protrusion 27 punched 28 groove 29 gauge groove 30 bolt 31 screw portion 32 screw head 40 nut 41 washer portion 50 washer

Claims (5)

A joint for a construction site sheeting sheet used to sandwich and connect at least two sheeting sheets,
A protrusion formed in a substantially disc shape, and a projection formed to project from the upper surface at equally spaced positions from the center position of the upper surface to the both sides, and A base portion having a recess and a first hole formed to penetrate a central portion on the upper surface of the first recess;
A second disk formed in a substantially disc shape, and a second hole formed to penetrate the central part thereof, and a second hole formed at a predetermined distance from the central position of the lower surface in the front and rear, right and left directions A cup portion having a recess and a metal pin fitted in the second recess so that a substantially conical tip protrudes from the lower surface;
A nut exchangeably fitted to the first recess from the lower surface side of the base portion;
When the cup portion is put on the base portion so that the second hole portion coincides with the first hole portion, the second hole portion and the first hole portion are inserted from the upper surface side of the cup portion A bolt for screwing into a nut,
The joint of the laying iron plate for construction site characterized by having.   A seat nut having a washer portion is used as the nut, and the nut is fitted into the first recess from the lower surface side of the base portion with the washer portion facing downward. Joints for sheeting for construction sites as described.   When the upper surface of the base portion is divided into two surface regions by a straight line connecting two projection portions, the surface of the base region is a magnet at a predetermined position of one of the two surface regions. The joint of the laying iron plate for construction site according to claim 1 or 2, wherein the joint is fixed so as not to protrude from the upper surface of the joint.   The construction type iron plate according to claim 1, 2 or 3, wherein a wall portion lower than the projection is integrally formed with the two projections between the two projections. Joints. A recess for a bolt for storing a screw head of the bolt is formed in an upper central portion of the cup portion, and a bottom surface of the upper surface of the cup portion is positioned above the screw head of the bolt A joint for a construction site steel sheet according to claim 1, 2, 3 or 4, wherein a gage groove having such a depth is formed.

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