Column structure made of metal pipes

Abstract

The present invention provides a metal pipe column structure that prevents the lid from becoming buried. [Solution] The system comprises a metal pipe column body 3 with a working opening 2 formed at its lower part, and a metal pipe cover 4 that is slidably fitted onto the column body 3. The cover 4 is configured to slide between a closed position that covers the opening 2 and an open position that is above the closed position and exposes the opening 2. The column body 3 is provided with a receiving part 13 above X1 above the embedded part 9 at its lower end, which receives the cover 4 in the closed position from below X2.

Description

Technical Field

[0001] The present invention relates to a column structure made of a metal pipe, comprising a column body made of a metal pipe with a working opening formed at the lower part, and a lid body made of a metal pipe that is externally fitted to the column body so as to be slidable.

Background Art

[0002] Patent Document 1 describes a column structure comprising a column body (pole body 2) with an opening (4) formed at the lower part, and a lid body (lid 5) that is externally fitted to the column body so as to be slidable. The lid body of Patent Document 1 is configured to be slidable between a closed position covering the opening and an open position above the closed position and exposing the opening, and is configured to be fixed to the column body by a bolt (6) at the open position. In the column structure of Patent Document 1, while the opening can be covered by the lid body, the lid body is constituted by a cylindrical body and used for reinforcing the column body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the column structure of Patent Document 1, although the lid body is configured to be fixed by a bolt at the closed position, since the fixed lid body extends to the lower end of the column body, when the lower end part of the column body is embedded in a concrete slab or the like, there is a risk that the lower part of the lid body will be buried.

[0005] In view of this situation, the main problem of the present invention is to provide a column structure made of a metal pipe that can prevent the lid body from being buried.

Means for Solving the Problems

[0006] The first characteristic configuration of the present invention comprises a column body made of a metal tube with a working opening formed at the bottom, and a lid made of a metal tube that is slidably fitted onto the column body, The cover is configured to slide between a closed position that covers the opening and an open position that is above the closed position and exposes the opening. The column body is provided with a receiving portion above the buried portion at its lower end, which receives the lid in the closed position from below.

[0007] This configuration allows the lid to be fitted onto the column body, enabling smooth sliding movement of the lid and maintaining operability while reinforcing the column body. Furthermore, by providing a receiving part that catches the lid in the open position, it is possible to prevent the lid from moving below the open position. Therefore, when the buried portion of the column body is fixed to the ground or other materials and embedded in a concrete slab or the like, it is possible to reliably prevent the lower part of the lid from being accidentally buried.

[0008] A second characteristic feature of the present invention is that the length of the receiving portion protruding from the column body is set to be greater than or equal to the thickness of the cover plus the gap between the column body and the cover.

[0009] This configuration allows the lid to be reliably received by the receiving part when it is in the closed position, while maintaining the operability of the lid. [Brief explanation of the drawing]

[0010] [Figure 1] Side view of a metal tube column structure with the lid in the closed position. [Figure 2] Side view of a metal tube column structure with the lid in the open position. [Figure 3] Side view of a metal pipe column structure with the buried portion of the column body installed. [Figure 4] Cross-sectional view of a metal pipe column structure with the buried portion of the column body embedded. [Modes for carrying out the invention]

[0011] An embodiment of the metal tube column structure according to the present invention will be described based on the drawings. As shown in Figures 1 and 2, the metal pipe column structure 1 comprises a metal pipe column body 3 with a working opening 2 formed at its lower part, and a metal pipe cover 4 that is slidably fitted onto the column body 3. The cover 4 is configured to slide between a closed position that covers the opening 2 (see Figure 1) and an open position (see Figure 2) that is above the closed position X1 and exposes the opening 2. In this embodiment, the case in which the metal pipe column structure 1 is used as a column structure for electric lights will be described.

[0012] A lighting fixture (not shown) is installed at the upper end of the column body 3, and electrical wires (not shown) and other components that supply electricity to the lighting fixture are installed inside the column body 3. The opening 2 is provided for inspecting the electrical wires and other components installed inside the column body 3.

[0013] The column body 3 is made of a circular steel pipe and is fixed in an upright position on the foundation concrete 6 (foundation structure). In this embodiment, a plate 7 is joined to the lower end of the column body 3 by welding or the like, and the plate 7 is joined to the foundation concrete 6 by anchor bolts, thereby fixing the column body 3 in an upright position on the foundation concrete 6.

[0014] As shown in Figure 3, the column body 3 has an embedded portion 9 at its lower end, and concrete 10 is poured on the foundation concrete 6 to embed the embedded portion 9 and plate 7 of the column body 3. In this way, the embedded portion 9 of the column body 3 is embedded in the concrete 10. The part of the column body 3 that is embedded in the concrete 10 is referred to as the embedded portion 9.

[0015] As shown in FIGS. 1 and 2, the opening 2 provided in the column body 3 is provided at the lower part of the column body 3 and above the buried part 9 on the upper side X1. The opening 2 is formed in a rectangular shape that is long in the vertical direction X. In the present embodiment, the lateral width of the opening 2 is about half of the inner diameter of the column body 3, and the vertical width of the opening 2 is about three to four times the lateral width of the opening 2.

[0016] The lid body 4 is composed of a circular steel pipe with a larger diameter than the column body 3 so as to be externally fitted to the column body 3. The lid body 4 is made of a circular steel pipe with the same steel pipe thickness as the column body 3 and a steel pipe of the same material as the column body 3. Also, as shown in FIG. 4, in the present embodiment, there is a difference of about several millimeters (for example, 5 to 7 mm) between the inner diameter of the lid body 4 and the outer diameter of the column body 3, and the lid body 4 is fitted with a clearance so as to be slidable along the vertical direction X with respect to the column body 3.

[0017] As shown in FIGS. 1 and 2, the lid body 4 is formed such that its length in the vertical direction X is, for example, three times or more the vertical width of the opening 2. And, as shown in FIG. 1, the closed position of the lid body 4 is set such that the center of the lid body 4 in the vertical direction X is located at the center of the opening 2 in the vertical direction X.

[0018] A sealing material 12 for closing the gap formed between the lid body 4 and the column body 3 is provided at the upper end of the lid body 4. The sealing material 12 closes the gap between the lid body 4 and the column body 3 by curing a paste-like material such as a silicone-based sealing material in a state where the lid body 4 is in the closed position, preventing rainwater and dust from entering the gap. And the lid body 4 is held in the closed position by this sealing material 12, and the sealing material 12 functions as a holding member for holding the lid body 4 in the closed position. Incidentally, the lid body 4 can be moved from the closed position by cutting the sealing material 12. <000,088><000,089><000,090>The column body 3 is provided with a receiving portion 13 that receives the lid body 4 in the closed position from the lower side X2 above the embedded portion 9 and below the opening 2. The receiving portion 13 is provided over the entire circumferential direction of the column body 3 in a state of protruding radially outward from the column body 3, and is configured to support the entire circumferential direction of the lid body 4 in the closed position from the lower side X2. Thus, by supporting the lid body 4 in the closed position received from the lower side X2 by the receiving portion 13, the lid body 4 is prevented from moving to the lower side X2 from the closed position, and the movement of the lid body 4 up to the height where the embedded portion 9 is provided (the height where the concrete 10 is placed) is restricted.

[0020] As shown in FIG. 4, the protruding length L of the receiving portion 13 is set to be equal to or greater than the length obtained by adding the thickness of the lid body 4 and the gap dimension between the column body 3 and the lid body 4. Specifically, the gap dimension is the difference between the outer diameter of the column body 3 and the inner diameter of the lid body 4. Even when the centers of the column body 3 and the lid body 4 are displaced in the radial direction as well as in the state where the centers of the column body 3 and the lid body 4 coincide, the entire radial direction of the lid body 4 can be received by the receiving portion 13.

[0021] As described above, the column structure 1 made of a metal pipe includes a metal pipe column body 3 having a working opening 2 formed in the lower part, and a metal pipe lid body 4 slidably fitted over the column body 3. The lid body 4 is configured to be slidable between a closed position covering the opening 2 and an open position above the closed position at the position X1 and exposing the opening 2. The column body 3 is provided with a receiving portion 13 that receives the lid body 4 in the closed position from the lower side X2 above the embedded portion 9 provided at its lower end. Therefore, by fitting the lid body 4 over the column body 3, the reinforcement of the column body 3 can be performed while maintaining the operability by enabling the smooth sliding movement operation of the lid body 4. Further, by providing the receiving portion 13 for receiving the lid body 4 in the open position, it is possible to prevent the lid body 4 from moving to the lower side X2 from the open position. Therefore, when the embedded portion 9 of the column body 3 is fixed to the foundation concrete 6 and embedded in the concrete 10, it is possible to surely avoid the lower part of the lid body 4 from being accidentally buried in the concrete 10.

[0022] [Another embodiment] Other embodiments of the present invention will now be described. Note that the configurations of each embodiment described below are not limited to being applied individually, but can also be applied in combination with the configurations of other embodiments.

[0023] (1) In the above embodiment, the protruding length L of the receiving portion 13 from the column body 3 was described as an example in which the length was set to be greater than or equal to the thickness of the lid 4 plus the difference between the outer diameter of the column body 3 and the inner diameter of the lid 4. However, the protruding length L of the receiving portion 13 from the column body 3 may be changed as appropriate, for example, to be the length obtained by adding half the difference between the outer diameter of the column body 3 and the inner diameter of the lid 4 (the gap dimension between the column body 3 and the lid 4 when the centers of the column body 3 and the lid 4 coincide) to the thickness of the lid 4.

[0024] (2) In the above embodiment, a configuration in which the receiving portion 13 is provided over the entire circumference of the column body 3 was described as an example, but the receiving portion 13 may be provided only in a part of the circumference of the column body 3.

[0025] (3) In the above embodiment, an example was described in which the cover 4 is made of a metal pipe with the same steel pipe thickness and material as the column body 3. However, the cover 4 may be made of a metal pipe with a different pipe thickness or material than the column body 3. Alternatively, the cover 4 may be made of a metal pipe with a pipe thickness greater than that of the column body 3, or a metal pipe made of a material with higher strength than that of the column body 3.

[0026] (4) In the above embodiment, a configuration in which a paste-like sealing material 12 such as a silicone-based sealing material is used as a retaining member for holding the lid 4 was described as an example. However, a ring-shaped sealing material such as a rubber gasket or a screw may also be used as a retaining member for holding the lid 4. When a ring-shaped sealing material is used, the frictional force of the sealing material provided at the upper end of the lid 4 against the column body 3 may be set to a frictional force that prevents the lid 4 from moving downward X2 due to its own weight, and also to a frictional force that allows the lid 4 to be moved vertically X by manual operation, so that the lid 4 can be moved without removing the sealing material.

[0027] (5) In the above embodiment, the case in which the pole structure 1 made of metal pipe is used as a pole structure for electric lights was described, but the pole structure 1 made of metal pipe can be used as an electric pole, a pole that supports signals or signs, or a pole that is used as a gutter by allowing drainage to flow into the pole body 3, etc. [Explanation of symbols]

[0028] 2 aperture 3. Main pillar 4. Lid 9 Buried part 13 Receptacle X1 Upper side

Claims

1. It comprises a column body made of metal tubing with an opening for work formed at the bottom, and a cover made of metal tubing that is slidably fitted onto the column body, The cover is configured to slide between a closed position that covers the opening and an open position that is above the closed position and exposes the opening. The column body is a metal pipe column structure, with a receiving portion located above the buried portion at its lower end, which receives the lid in the closed position from below.

2. The metal pipe column structure according to claim 1, wherein the length of the receiving portion protruding from the column body is set to be greater than or equal to the thickness of the cover plus the gap between the column body and the cover.

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