JP3257411B2 - Square pipe cap for civil engineering or construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap for erecting material used in civil engineering work and a thick end used in a construction site.

[0002]

2. Description of the Related Art At a civil engineering work site, steel sheet piles are attached to both sides of a trench formed by excavating soil to prevent earth and sand from falling into the trench. A plurality of steel sheet piles 1 are arranged along both walls of the excavation groove as shown in FIG. In addition, steel sheet pile 1
Put the uplifting material 2 against the steel sheet pile 1 so that
The cutting beam 3 is inserted between the belly members 2 on both sides. Since the belly material 2 is used outdoors such as at a civil engineering site, earth and sand, water, and the like easily enter the inside. The intrusion of earth and sand, water, and the like causes the upset material 2 to corrode from the inner surface side, and shortens the service life of the upset material 2. Therefore, the end opening of the belly material 2 is closed by the cap 4 to prevent intrusion of earth, sand, water and the like. This type of cap is disclosed in Japanese Patent Application Laid-Open No. 7-30.
No. 5352, Japanese Utility Model Application Laid-Open No. 59-123972, and Japanese Utility Model Application Laid-Open No. 59-155395.

[0003]

The uplifting material 2 is often handled relatively roughly when used at a civil engineering work site or the like. Therefore, with the cap 4 that merely covers the end opening, the cap 4 is easily detached or easily broken. Even if there is no detachment or breakage, the fitting portion between the cap 4 and the protruding material 2 is distorted, and the watertightness of the fitting portion cannot be maintained. Further, for the sake of convenience of transportation and handling, a flared material with a handle 5 is also used. However, in such a flared material, a hole 6 is opened at a place where the handle 5 is attached. Water may enter the inside of the machine. For this reason, the conventional belly material cannot completely prevent water from entering the inside. If water entered, the cap had to be removed and drained. In this regard, most of the protruding materials in which the cap is fixed with a spring, the screw thread is engraved directly on the spring body, and if the cap is repeatedly attached and removed to drain water, the screw thread will collapse. Sometimes. As a result, the spring material and the cap material are not connected, and the cap cannot be attached to the protruding material.

[0004] Such a problem is not limited to the flaring material used for civil engineering work and the like, but also to a cap for covering an end opening such as a square pipe made of a thick pipe used at a construction site or the like. The same is true for That is, at a construction site, a similar square pipe is used as a tip, but cement, water, and the like easily enter the inside of the tip. The present invention has been devised in order to solve such a problem. By adopting a method in which a bolt is screwed into a pop nut fixed to a leaf spring, the opening end of the square pipe is securely closed and attached. An object of the present invention is to provide a cap for a square pipe that can withstand repeated use even when removed.

[0005]

According to the present invention, a cap for a square pipe for civil engineering or construction according to the present invention is provided with an insertion portion having a shape corresponding to the internal space of the square pipe on the back side, in order to achieve the object. A lid having a cover with the same contour as the end face of the pipe, a bolt inserted into a bolt hole formed in the center of the lid, and having a rubber cushion inserted therein, and a bolt disposed on the back side of the lid, And a chord-shaped leaf spring fixed to a center portion of the pop nut into which the nut is screwed. When the upper and lower edges of the leaf spring are elastically pressed against the inner surface of the square pipe, the lid is fixed to the end opening of the square pipe. It is preferable to form positioning projections on the rear side of the lid, which face the upper and lower edges of the leaf spring. Alternatively, a recess may be provided in the cover of the lid, and a drain hole may be formed in a diagonal corner of the recess. The lid is reinforced when one or more ribs are inserted across the edge of the cover facing the depression.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A square pipe cap according to the present invention is shown in FIG.
As shown in FIG. 1, a lid 20 for closing the end opening 13 of the square pipe 10 is provided. The square pipe 10 is made of, for example, an extruded aluminum material, and has a cross-sectional shape in which a side portion 12 of the square pipe 10 abutting on the steel sheet pile 1 is thickened so as to withstand the earth pressure. With this cross-sectional shape, the square pipe 10
The steel sheet pile 1 and the beam 3 have the strength to receive the force. In addition, a mounting hole 11 for mounting a handle 14 (FIG. 6) is formed on the upper surface of the square pipe 10. The end opening 13 of the square pipe 10 is closed with a lid 20 made of synthetic resin. As shown in FIGS. 2 and 3, the lid 20 has a cover 21 formed on the outer periphery having the same size as the end of the square pipe 10. An insertion portion 22 having substantially the same size as the cavity of the end opening 13 protrudes from the cover portion 21 toward the square pipe 10.

The inside of the cover 21 is recessed toward the square pipe 10, and a plurality of reinforcing ribs 24 are formed in the recess 23. The ribs 24 are effective not only for the lid 20 but also for reinforcing the end of the square pipe 10 to which the lid 20 is attached. The recess 23 is formed with two drain holes 25 at diagonal corners and a raised portion 2 having a bolt hole 26 at the center.
7 are formed. Four positioning projections 28 are provided on the back side of the insertion portion 22 to hold the leaf spring 30 at a predetermined position. The leaf spring 30 has a chordal shape convexly curved toward the square pipe 10, and a length along the chord direction is longer than an inner dimension of the square pipe 10. A pop nut 31 is fixed to the center of the leaf spring 30. The leaf spring 30 is fixed to the cover 20 by bolts 40 penetrating the cover 20.
Attached to. Since the upper and lower edges of the leaf spring 30 are regulated by the positioning projections 28, respectively, the leaf spring 30 is disposed at a predetermined position on the back side of the lid 20.

[0008] The bolt 40 has a head 4 having a hexagonal hole formed therein.
A male screw 43 is engraved at the tip of a leg 42 extending from 1. The bolt 40 is inserted into the bolt hole 26 of the lid 20, the cushion rubber 44 is inserted into the leg 42, and screwed into the pop nut 31 fixed to the leaf spring 30. Cushion rubber 4
The leaf spring 30 is kept at a predetermined distance from the lid 20 by interposing the cover 4. The pop nut 31 is the lid 2
0 is provided so that it can be repeatedly attached. It becomes necessary to remove it due to drainage or rough handling, etc.
Even if the attachment / detachment is repeated many times or the handling is performed roughly, the collapse of the screw thread can be eliminated by providing the pop nut 31. When the male screw 43 of the bolt 40 is screwed into the female screw of the pop nut 31, the leaf spring 30 is disposed on the back side of the lid 20 as shown in the side view (a) and the plan view (b) in FIG. It is attached.

When mounting on the square pipe 10, the back side of the lid 20 is pushed into the end opening 13 of the square pipe 10. At this time, the length of the leaf spring 30 in the chord direction is the square pipe 1.
Since it is longer than the inner dimension of 0, it is bent by the inner wall of the square pipe 10. For this reason, both upper and lower edges of the leaf spring 30 are pressed against the inner surface of the square pipe 10 by elastic repulsion due to elastic deformation.
As a result, the lid 20 is fixed to the end opening of the square pipe 10 as shown in FIG. When the elasticity of the leaf spring 30 is insufficient, the amount of screwing of the bolt 40 is increased to attract the leaf spring 30 to the back side of the lid 20 as shown in FIG. As a result, the leaf spring 30 has a gently curved shape, and the elasticity of pressing the inner surface of the square pipe 10 increases. In any case, the leaf spring 3
Numeral 0 is prevented from tilting by the positioning projections 28, and maintains a posture that matches the vertical direction of the square pipe 10. Therefore, the leaf spring 30 is pressed against the inner surface of the square pipe 10 with a sufficient elasticity to fix the lid 20.

When the cap is mounted, the leaf spring 30 is
After being temporarily fastened to 0, it is hard-tightened to the square pipe 10 because it is fully tightened to the square pipe 10, and the degree of tightening is difficult to understand. Therefore, when the bolt 40 is turned too much, the leaf spring 30 comes into contact with the lid 20 and is bent by the lid 20 instead of the square pipe 10,
There is a possibility that the lid 20 cannot be sufficiently fixed to the square pipe 10. However, in the present embodiment, since the cushion rubber 44 for holding the gap between the lid 20 and the leaf spring 30 at a predetermined interval is interposed, when the bolt 40 is tightened more than necessary,
Hits the cushioning rubber 44, which indicates an excessively tightened state. The cushion rubber 44 also has an effect of preventing the bolt 30 from dropping off the lid 20 when the lid 20 is separated from the leaf spring 30.

FIG. 6 is a perspective view of the lid 20 attached to the end of the square pipe 10 in this manner. In this state,
Since the end opening 13 of the square pipe 10 is sealed with the lid 20, intrusion of earth and sand, water, and the like into the inside of the square pipe 10 is suppressed. Also, even if there is intruding water, the handle 14
Thus, the square pipe 10 can be tilted so that the water can be easily drained from the drain hole 25 opened at the corner of the depression 23. Handle 14
Is also used for transporting and handling the square pipe 10. When removing the lid 20, the bolt 40 is loosened and removed from the pop nut 3, and then the lid 20 is removed. Then, by rotating the leaf spring 30 left in the square pipe 10 right and left, the leaf spring 30 can be easily removed.

[0012]

As described above, the cap of the present invention employs a system in which a bolt having a cushion rubber inserted therein is screwed into a pop nut fixed to a leaf spring. for that reason,
Unlike conventional caps in which female threads are directly engraved on leaf springs, excessive tightening is avoided by cushioning rubber, screw threads are less likely to collapse, and caps are securely and repeatedly attached to the end openings of square pipes It becomes possible. Further, water or the like that has entered the inside of the square pipe is easily discharged from a drain hole provided in the lid.

[Brief description of the drawings]

[Fig. 1] Belly protruding material applied to steel sheet pile

FIG. 2 is an exploded perspective view of a square pipe cap according to the present invention.

FIG. 3 is a front view of a lid.

FIG. 4 is a side sectional view (a) and a plan sectional view (b) of a square pipe cap according to the present invention.

FIG. 5 shows a state in which a cap (a) attached to a square pipe and bolts are tightened (b)

FIG. 6 is a perspective view showing a state where a cap is attached to an end of a square pipe.

[Explanation of symbols]

10: Square pipe 11: Mounting hole 12: Thick side 13: End opening 14: Handle 20: Lid 21: Cover 22: Insertion 2
3: recess 24: rib 25: drain hole 26: bolt hole 27: raised portion
28: Positioning projection 30: Leaf spring 31: Pop nut 40: Bolt 41: Head with hexagonal hole 42: Leg 43: Male screw 44: Buffer rubber

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E02D 17/04 E04G 21/24 F16L 55/00

Claims (3)

(57) [Claims] 1. A lid body having an insertion portion having a shape corresponding to the internal space of a square pipe on the rear side, a cover body having a covering part having the same contour as an end face of the square pipe, and a bolt hole formed in a central part of the lid body. And a string-shaped leaf spring, which is disposed on the back side of the lid and has a pop nut fixed at the center thereof, into which the bolt is screwed, and upper and lower edges of the leaf spring. A cap for a civil engineering or building square pipe in which a lid is fixed to an end opening of the square pipe by elastically pressing the portion against the inner surface of the square pipe. 2. The cap according to claim 1, wherein positioning projections are formed on the rear side of the lid so as to face the upper and lower edges of the leaf spring. 3. The cap for a civil engineering or building square pipe according to claim 1, wherein a dent is provided in the cover of the lid, and a drain hole is formed in a diagonal corner of the dent.