JPH073759A - Joint structure of column in lifting equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a joint structure of a strut that is separable and has high strength. [Structure] A support member 11 is a joint portion structure 13 for connecting the ends of divided legs 3A and 3B to each other, in which a rack body 12 is provided along the longitudinal direction thereof.
A first connecting flange portion 21 having an engaging protrusion is formed at the end of the above, and an engaging recess for fitting the engaging protrusion is formed at the end of the other strut member 11 and The second connecting flange portion 31 that abuts the first connecting flange portion 21 is formed, and at the time of mutual connection, the engaging convex portion is fitted into the engaging concave portion, and both connecting flange portions 21, 31 are connected to each other by a connecting bolt 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a column member in a lifting device.

[0002]

2. Description of the Related Art Usually, an offshore oil rig (hereinafter referred to as an oil rig) is provided with legs (hereinafter referred to as legs) for supporting a marine work platform above the sea surface.

This leg is movable up and down with respect to a work table by a lifting device having a rack and pinion mechanism, and has a structure in which a rack body is fixed to a support member by welding, for example.

By the way, the length of the leg in such a lifting device is preset, and no consideration has been given to disassembling and transporting the leg itself, for example. However, recently, there has been a demand for disassembling and transporting the legs, and as described above, therefore, a long column member to which a rack body is fixed can be separably connected on the way. Partial structure is required.

Conventionally, as such a joint structure, for example, as shown in FIG. 14, the pillar members 102 of the legs 101 are fixed to each other by welding a, and the rack bodies 103 attached to the side surfaces thereof are connected to each other. Connection plate 104 and connecting bolt (for example, high tension bolt is used) 105
It is conceivable that the structures are connected to each other by using.

[0006]

However, as described above, since the rack bodies 103 are connected to each other through the connection plate 104 and the high tension bolt 105, when a large lateral load acts on the leg 101, That is, when a large bending moment acts, a shearing force acts on the connecting bolt 105, so that there is a problem that the strength at this connecting portion is weak.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a joint structure for a column in a lifting device that can solve the above problems.

[0008]

In order to solve the above-mentioned problems, the joint structure of the supporting column in the lifting device of the present invention is
A strut member is provided with a rack body along the longitudinal direction of the strut member to connect the end portions of the strut bodies to each other, and the strut member has an engaging convex portion at an end portion of the strut member. A second connecting flange that forms a first connecting flange portion, and has an engaging concave portion that is fitted to the engaging convex portion at the end portion of the other strut member and that abuts against the first connecting flange portion. And the engaging convex portion is fitted into the engaging concave portion, and both connecting flange portions are connected to each other by a connecting bolt when they are connected to each other. .

[0009]

According to the above construction, when the pillars are connected to each other, the engaging protrusion on the side of the first connecting flange portion becomes the second
The connecting flange portions are brought into contact with each other so as to be fitted into the engaging recesses of the connecting flange portion, and then the connecting flange portions are connected by the connecting bolts.

As described above, since the engaging convex portion is fitted into the engaging concave portion, and the connecting flange portions are connected to each other through the connecting bolts, the strut bodies are connected to each other. For example, when a large lateral load, that is, a large bending moment is applied to the support column, the shearing force is received by the engaging convex portion and the engaging concave portion, and the bending moment is generated between the connecting bolts. It will be reliably supported by the tensile force.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes, for example, an oil rig, and legs (an example of a support body) 3 for supporting the workbench 2 are arranged at a plurality of predetermined positions of the workbench 2.

The legs 3 are lifted and lowered by a lifting device 5 having a rack and pinion mechanism 4, and the legs 3 are divided at appropriate positions in the longitudinal direction (indicated by arrows A). It has a structure that allows it.

That is, as shown in FIGS. 2 to 11, each leg 3 has a column member 11 having an H-shaped cross section, and a rack body provided at the center of the column member 11 and along its longitudinal direction. 12 (specifically, a plate body is welded to both sides of the rack body in a T-shape), and the ends of each leg 3 are separable from each other. Is provided with a joint structure 13 that can be connected to.

The joint structure 13 will be described below. That is, at the lower end of the upper first split leg 3A,
As shown in FIGS. 4, 6, 7, 10, and 11,
For example, an H-shaped first connecting flange portion 21 is provided, and a circular engaging convex portion 22 having a key groove portion 23 is formed to project at the center of the lower surface of the first connecting flange portion 21.

At the upper end of the lower second split leg 3B, as shown in FIGS. 5, 8 and 9, a second connection having the same shape as the first connection flange portion 21, that is, an H shape. A flange portion 31 for use is provided, and a key portion 33 that can be fitted into the key groove portion 23 is attached to the center of the upper surface of the second connection flange portion 31, and a circular shape that allows the engagement protrusion 22 to be fitted. An engagement recess 32 is formed.

Further, the flange portions 21 and 31 for connecting both of the above
As shown in FIGS. 3, 10 and 11, a plurality of bolt holes 24 and 34 are formed at the same positions where they face each other.

Therefore, in the above structure, when the upper and lower split legs 3A and 3B are connected to each other,
The engaging projection 22 on the first connecting flange portion 21 side fits into the engaging recess 32 of the second connecting flange portion 31, and the key portion 33 enters the key groove portion 23. After bringing the connection flange portions 21 and 31 into contact with each other, the bolt holes 24 formed in the connection flange portions 21 and 31
While inserting the connecting bolt 41 into the nut 34, the nut 4
2 may be screwed to connect and fix the connecting flange portions 21 and 31.

Further, the connecting bolt 41 for connecting the connecting flange portions 21 and 31 to each other is, specifically, attached to the auxiliary mounting flange 21a, which is attached at a position slightly apart from the connecting flange portions 21 and 31. It is attached across 31a.

When the upper and lower split legs 3A and 3B are connected, the upper and lower rack bodies 12 are recessed 21a and 31a of the connecting flange portions 21 and 31 (shown in FIG. 10).
They are inserted through the space and are connected to each other.

As described above, when connecting the split legs 3A and 3B to each other, the engaging convex portion 22 is fitted into the engaging concave portion 32, and the connecting flange portions 21 and 31 are connected to each other by the connecting bolt. Since the split legs 3A and 3B are connected to each other by connecting the split legs 3A and 3B via the nut 41 and the nut 42, for example, when a large lateral load, that is, a large bending moment acts on the leg 3, the shearing force is increased. The bending moment, which is received by the portion 22 and the engaging recess 32, is reliably supported by the tensile force generated between the connecting bolts 41, and is supported by the shearing force as in the conventional case. Compared to the case, it is very advantageous in terms of strength. The key portion 33 functions, for example, for positioning both the connection flange portions 21 and 31.

As described above, the joint portion structure of the legs 3A and 3B is formed by the engaging convex portion 22 and the engaging concave portion 32, and both connecting flange portions 2 contacting each other.
Since the 1 and 31 are connected to each other by using the connecting bolt 41 and the nut 42, it is possible to convey the leg 3 in a divided state and convert the leg 3 into another oil rig.

It should be noted that, in a state in which they are connected to each other, it is only necessary to remove the connecting bolt 41, so that both split legs 3
A and 3B can be easily separated. By the way, in the above-described embodiment, the cross-sectional shape of the connecting flange portions 21 and 31 provided at the ends of the split legs 3A and 3B is described as an H-shape, but as shown in FIGS. The connecting flange portions 21 and 31 may be circular.

Further, in the above embodiment, the engaging convex portion is formed on one of the connecting flange portions. For example, a key is used as the engaging convex portion and the key is formed on the one connecting flange portion. It may be fixed.

Further, in the above-mentioned embodiment, the case where the invention is applied to the leg of the oil rig has been described, but the invention can also be applied to, for example, a similar joint structure between columns in another building structure.

[0025]

As described above, according to the structure of the present invention, when connecting the pillars to each other, the connecting flange portions that come into contact with each other are provided, and the engaging convex portion is provided on one of the connecting flange portions. Further, the other connecting flange portion is provided with an engaging concave portion into which the engaging convex portion can be fitted, and both flange portions are connected by a connecting bolt when the connecting flange portions come into contact with each other. When a large lateral load is applied to the body, that is, a large bending moment is applied, the shearing force is received by the engaging convex portion and the engaging concave portion, and the bending moment is the tensile force generated between the connecting bolts. As a result, it is surely supported, which is extremely advantageous in terms of strength as compared with the case of supporting by a shearing force as in the conventional case.

Further, since the strut bodies are structured so that they can be easily connected and separated in this manner, it is possible to easily carry the legs in a divided state and to divert the strut bodies to other structures. .

[Brief description of drawings]

FIG. 1 is a schematic overall side view of an oil rig according to an embodiment of the present invention.

FIG. 2 is an enlarged view of an arrow A portion of FIG.

3 is a BB arrow view of FIG. 2. FIG.

4A and 4B are views showing a joint portion structure in one rig of the embodiment, in which FIG. 4A is a partially cutaway side view and FIG.

5A and 5B are views showing a joint structure of the other rig of the embodiment, FIG. 5A is a partially cutaway side view, and FIG. 5B is a front view of the same.

FIG. 6 is an enlarged view of a portion viewed from arrow C in FIG.

FIG. 7 is a view taken along the line GG in FIG.

FIG. 8 is an enlarged view of a portion viewed from an arrow D in FIG.

9 is a view as seen from an arrow HH of FIG.

10 is a view taken along the line EE in FIG.

FIG. 11 is a view on arrow FF in FIG.

FIG. 12E of FIG. 4 showing a modification of the leg shape of the same embodiment.
-E is a view corresponding to the arrow.

FIG. 13 is an F of FIG. 4 showing a modification of the leg shape of the embodiment.
It is a figure corresponding to the arrow F.

FIG. 14 is a side view of essential parts showing a joint structure in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil rig 2 Working table 3 Leg 3A 1st division leg 3B 2nd division leg 4 Rack and pinion mechanism 5 Lifting device 11 Strut member 12 Rack body 13 Joint part structure 21 1st connection flange part 22 Engagement convex part 23 Key Groove 31 Second flange for connection 32 Engagement recess 33 Key 41 Connection bolt 42 Nut

Claims (1)

[Claims] 1. A joint structure for connecting end portions of column members to each other, in which a rack member is provided on a column member along a longitudinal direction thereof, and the end portions of one column member are engaged with each other. A first connecting flange portion having a convex portion is formed, and an engaging concave portion that fits into the engaging convex portion is formed at the end portion of the other strut member and abuts against the first connecting flange portion. The second connecting flange portion is formed, and when connecting to each other, the engaging convex portion is fitted into the engaging concave portion, and both connecting flange portions are connected to each other by the connecting bolt. A joint structure of a support column in a lifting device, which is characterized by being configured.