JPS5826447B2 - Truss strut coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the truss column connection method for a self-elevating offshore work platform.

Conventionally, as shown in Fig. 1, a truss support 5 is placed upright on the seabed, a workbench 3 is moved and held at an appropriate height above the sea surface, and a drilling gouge 6 is used to perform IJ on the seabed. We are working on searching for resources.

For small movements within the work area, use the work platform 3 as shown in Figure 2.
was floated on the sea surface, and the long truss support was raised to the bottom of the workbench.Although it was in a very unstable state, it was possible to limit the sea conditions and allow small movements by towing or self-propulsion.

However, in cases where the L dimension as shown in Fig. 2 reaches 120M, it is necessary to move the work area to a remote location.
Since the center of gravity was high and moving it offshore was dangerous, the method was to cut it by one dimension, place it separately on a workbench, and weld it again after moving it.

In some truss columns, the spacing between the columns 5' as shown in Fig. 4 reaches IOM, and the workbench is usually equipped with only a 30T miscellaneous crane (not shown), so the second As shown in the figure, the truss columns 5 are cut into three dimensions and arranged on a workbench within the lifting capacity of a miscellaneous crane.

As a method for subdividing a truss column, in addition to the above-mentioned cutting method, a joint structure for a truss column has been devised according to Utility Model Publication No. 53-35925.

FIG. 6 illustrates the external force acting on the joint of the truss column, and according to the example, the compressive force (WC) is 350
0T, tensile force (WT) is 2000T, horizontal force (W
H) is 100OT, which suggests that it is not easy to perform the joining method manually.

The cutting method is to use gas cutting to cut into small pieces and secure them on a workbench, and after the offshore movement is completed, the cut surfaces are refinished using a grinder, etc., and then welded together and restored. However, there are major drawbacks in that it takes a long time and expensive work barges are left idle.

Known utility model publication shown in Figures 7 and 8, 1982-35
925 is a method in which the male diameter-reduced part of the circular upper truss column and the female part of the circular lower truss column are fitted together to form a wedge plug, but common sense suggests that the male diameter-reduced part and the female part In order to fit the truss column, the fitting part must be machined after the truss column is assembled, which increases manufacturing costs.

Another difficulty that can be expected in the joining work is that a general-purpose crane on a workbench can only lift the workpiece horizontally, so the diameter of the mating part is approximately the same as the diameter of the truss support. It is not easy to connect devices that have similar lengths.

What is even more troublesome is that the truss columns are naturally distorted by uneven direct sunlight and changes in temperature, which poses a major problem in connection work.

The present invention completely solves the operational difficulties of the conventional equipment,
This was done in order to provide an excellent device that can safely and reliably connect truss struts with a small amount of time and manpower, and that only requires machining, which is the main cause of high costs, for parts.

The explanation will be based on the drawings showing the embodiments of the present invention.
Figure 1 is a side view of the self-elevating work platform during work, Figure 2 is a side view of the work platform moving within the work area, Figure 3 is a partially enlarged side view of the truss column, and Figure 4 is a view taken along arrow A-A in Fig. 3, Fig. 5 is an enlarged sectional view of the truss column, Fig. 6 is an illustration of the external force acting on the joint of the truss column, Figs.
The figure shows a joint structure of a known truss support, and FIGS. 9 to 29 show embodiments of the present invention.

In Figure 1, 1 is the sea surface, 2 is the seabed, 3 is the workbench, and 4
2 is a lifting device, 5 is a truss column, 6 is an excavator, in FIG. 2, 7 is a towboat, and 3 is a towline.

Dimension 1 indicates the area to be removed in order to lower the center of gravity of the workbench during offshore movement, and dimension 8 represents the size to be subdivided based on the capacity of the miscellaneous crane equipped with the workbench.

In Figures 3, 4, and 5, 5' is a truss support;
5//.

5'' is a truss member, and 5'A is a rack for the lifting device.

Fig. 7 is a longitudinal cross-sectional view of a known joint structure, and Fig. 8 is B of Fig. 7.
-B arrow view.

A is a male-shaped reduced diameter part of the upper truss column, B is a female part of the lower truss column, C is a wedge plug, and D is a bolt for attaching and removing the wedge plug.

Even with this device, the distance between the truss supports is expected to reach several meters, but if the truss material is detachable from the supports, then
It is thought that the fitting of the members B and B is easy to the extent possible, but if the truss member has an integral structure, it seems that it is not easy to attach and detach as described above.

FIG. 9 is an enlarged view of the truss column shown in FIG. 5, and is a plan view of the truss column equipped with the present invention, and FIG. 10 is a view taken along arrow C-0 in FIG. 9, showing the main part of the present invention.

11 to 15 show the main parts of the present invention in detail, including the tilted view. FIG. 11 is a view taken along the line D-D in FIG. Figure 13 is a view from the E-E arrow in Figure 9, Figure 14 is a view from the F-F arrow, and Figure 15 is a view from Figure 13 and 1.
FIG. 4 is a front view of FIG. 4;

In FIG. 10, reference numeral 9 denotes a partition wall of the support column, which is provided to prevent seawater from entering the interior of the support support.

10.11 is a plate material horizontally attached to the lower part of the upper strut and the upper part of the lower strut, and supports the compressive force of the strut and transmits it to the connected strut 5'.

Reference numeral 12 denotes a box-shaped convex metal piece attached to 11, which reliably transmits the horizontal acting force to the connected column 5' through a hole 10A drilled in 10.

In Figures 11 and 12, io' and i1' are pillars 5
′ is an eave extending approximately parallel to the required width.

Reference numeral 13 denotes a support fitting fitting according to the present invention, which is connected via left and right hinges 14 and pins 16 to a hinge 15 attached to the lower support support 5'.

17 is a nut, 18 is a stopper attached to the lower support 5' across one hinge 14, 18' is a long hole drilled in one hinge 14, 19 is a pin, 20 is a nut, and 21 is an eye plate. , 22 is a bolt, 23 is a socket for the bundle, and 24 is a bundle for operating the support fitting fitting 13.

The upper and lower surfaces of the eaves 10' are coplanar, and the lower surface is in contact with the upper surface of the eaves 11'.

The lower surface of the eave 11' is sloped within a friction angle in order to allow the coupling fitting hardware 13 to move circularly around the pin 16 and to eliminate play in the coupling portion when tightened with the bolt 22.

The pin holes of the hinges 14 and 15 are made with a slightly larger margin than the diameter of the pin 16.

The solid line of the joint fitting hardware 13 shows the connected state, and the chain line shows the open state.

Now, to explain the method of joining the truss columns 5 subdivided into eight dimensions shown in FIGS. 2, 3, and 4 in order, the joining fitting fittings 13 shown in FIGS. 11 and 12 are ,
It is located at the position indicated by the chain line in FIG.

In this state, the entire weight of the joint fitting hardware 13 is supported by the left and right hinges 14 and the hinge 15 via the pin 16.
The rotational force due to gravity and the θ angle is applied to the stopper 18 by the pin 19.
It is in a stable stationary state because it collides with the inner surface of the elongated hole 18' drilled in the hinge 14 on one side through the hinge 14 and is balanced.

The subdivided truss columns 5 to be connected are suspended in a nearly horizontal state using a general-purpose crane (not shown) equipped with a workbench, and the hole 10A shown in FIG. The centering of the truss column 5 is completed.

In this case, even in the embodiment of the present invention, the diameter of the box-shaped convex metal part is about 200%, and the fitting length, that is, the thickness of the lower horizontal plate material is about 100%, so the distortion due to the expected temperature change Even if there is, the distortion due to the weight of the truss column 5 is corrected and fitting becomes possible easily.

In this case, the coupling fitting hardware 13 escapes slightly to the outside by an angle of θ, but the suspended truss column 5 is connected to the convex hardware 1.
2 and the hole 10A, the eave 10'
There is no fear that it will collide with the joint fitting fitting 13 shown by the chain line.

Next, attach the bundle 24 shown by the chain line in FIG. 11 to the socket 2.
3 and manually pull it in the direction of the arrow, it will instantly become a solid line.

All that is left to do is to adjust the tightening of the bolt 22 by a slight gap.

In this embodiment, the connecting fitting fittings are placed in three places, and the bow tension of 2000T of the embodiment is borne almost equally into three parts, but the load to be borne is somewhat different because the poles have a gap between the poles.

According to the present invention, the weight of the joint fitting hardware 13 is 200.
However, since the θ angle only needs to be small, if a bundle 24 with a length of 1.6 meters is used, the weight will be only 1.
It can be operated with 3 kg of human power.

Opening is done in reverse, but remove the bolt 22 shown in FIG.
' If you insert it between 1 and 2 and manually pull it in the direction of the arrow, it will open with just 1 kg of human power, and due to gravity and the stopper 18, it will come to rest at the position shown by the chain line.

After that, use a general crane to lift it up and store it in an appropriate position on the workbench.

13, 14, and 15 are inventions in which the hinge 14 shown in FIGS. 11 and 12 cannot be attached symmetrically because of the truss member 5''.

To explain based on the drawings, 25 is a hinge with a connecting fitting 13, 26 is a hinge with a post 5', 27 is a pin, 28 is a nut, and 29 is a newly invented guide piece.

If the gap between the pin holes of the hinges 25 and 26 and the pin 27 is small, the guide piece 29 may be omitted, but since the hole is drilled with enough room for tightening the bolt 22, one side of the hinge 25 One is a compressive force, and the other is a tensile force, so that the coupling fitting fitting 13 is inclined with respect to the pin axis, making it difficult to fit the coupling fitting fitting 13.

The guide piece 29 is an invention that solves this drawback.

In other words, the axis of the pin 27 is set as the center of rotation with a radius of dimension R, which is the distance S between the axis of the pin 27 and the lower surface of the coupling fitting hardware 13 in FIG. Therefore, a guide piece 29 as shown in FIG. 14 is provided.

In this case, the weight of the fitting fitting 13 is supported by the inner hinge 25 and the guide piece 29, and the outer hinge 25 serves as a steering wheel.

The connection and release of the truss support 5 is exactly the same as described above, but when the joint fitting hardware 13 rotates, the bottom surface of the joining fitting metal fitting slides on the upper surface of the guide piece 29 with the pin 27 as the rotation axis. .

The human power required for operation is not much different from that described above.

FIG. 16 is a plan view of another embodiment of the present invention, and FIG. 17 is an enlarged plan view of the hinge, in which the solid line shows the jointed state and the chain line shows the opened state.

Figure 18 is a view taken along the line G-G in Figure 16, and Figure 19 is a view of the 18th
FIG.

To explain based on the drawings, in FIG. 16, FIG. 17, FIG. 18, and FIG.
One set is attached to the side of the hardware with attached hinges, and the reinforcing material 30'
It is reinforced with

31 is a hinge with support 5', 32 is a pin, 33 is a nut,
34 is a stopper pin, 35 is a socket for storing the pin 34, 36 is a chain string, 37 is a hole for the stopper pin 34 that is drilled in the hinge 30, and 38 is a hole for the stopper pin 34 that is drilled in the hinge 31. .

The holes for the pins 32 of the hinges 30, 31 are slightly larger than the pin diameter to allow for extra margin when tightening the bolts 22.

For this reason, the coupling fitting hardware 13 hangs down and pivots on the opposite side of the hinge when pivoting about the pin 32, so in order to facilitate coupling, contrary to the above-mentioned invention, the 18th
The upper surface of the eave 10' in the figure is a slope.

Since this method is a horizontal rotation type, it requires less human power to operate than the above-mentioned invention, and does not require tools such as bundles other than tightening with bolts 22, and is connected by pushing or pulling the fitting fittings at appropriate points. This is to open up the world.

However, since it is very unstable in the open state shown by the chain line, the stopper pin 34 shown in FIG. 19 is removed from the socket 35 and inserted into the holes 37 and 38 to prevent it from opening.

At the time of connection, the stopper pin 34 is returned to the socket 35.

FIG. 20 is a plan view of the device equipped with yet another invention, FIG. 21 is a view taken along the line H--H in FIG. 20, and FIG. 22 is a front view of FIG. 21.

To explain based on the drawings, in FIGS. 20, 21, and 22, 39 is a rail, 40 is a guide, 41 is a guide groove, 42 is a stopper, and 43 is a handle.

In FIG. 21, by applying grease to the upper surface of the rail 39, even if the weight of the fitting-in fitting is increased to 200 by applying the embodiment of the present application, the human power required to move the fitting-fitting fitting 13 is approximately 20 kg. ,
Although it is a little heavier than the hinge type mentioned above, it is still within the range that can be easily done manually.

This method also does not require tools such as bundles except for tightening the bolts 22.

If the bolt 22 is removed and the handle 43 is pulled, and the joint metal fitting 13 hits the stopper 42, the joint will be released.If the bolt 22 is pushed in the opposite direction and the bolt 22 is tightened, the joint will be completed. In the coupled state, a gap is created between the rail 39 and the bottom of the coupling fitting fitting 13.

Figure 23 is a view taken along the I-I arrow in Figure 20, and Figure 24 is a view of the
The front view of the figure, and FIG. 25 is a view taken along the JJ arrow in FIG. 20.

In Figures 20, 23, 24, and 25, 4
4 is a rail/workbench, 45 is a guide rail, 46 is a stopper, 47 is a handle, 10" is a guide rail, 13A
is the contact portion of the joint fitting hardware 13 with the upper surface of the eaves 10';
13B indicates the bottom of the coupling fitting hardware 13.

To connect the struts 5' with this device, see Figures 23 and 2.
In Figure 5, 13A.

Apply grease to the opposing part of No. 13B, and
When the joint fitting fitting 13 shown by the chain line in the figure is pushed in the direction of the arrow, it is initially guided by the rail 44 and guide rail 45 and then moved midway by the guide rail 10'' and the side wall of the support column 5' and slid at 13A. However, the eye plate 21 collides with the stopper 46 shown in FIGS. 20 and 24, and the coupling fitting hardware 13 stops.

Tightening the bolt 22 is the same as described above, and releasing it is exactly the opposite.

FIGS. 26 to 29 show modifications of the coupling fitting hardware 13, with FIG. 26 being a side view and FIG. 27 being a front view.

FIG. 28 is a side view of another shape, and FIG. 29 is a front view of FIG. 285.

In FIGS. 26 and 27, the coupling fitting hardware 13 is obtained by closing both sides of the coupling fitting fitting 13 described above.

In this case, although the thickness of the joint-fitting hardware 13 can be greatly reduced, the machining requires excavation, which is somewhat troublesome.

In FIGS. 28 and 29, the joint fitting hardware 13 is further provided with a partition wall in the middle, and in this case, the machining part passes through, so machining is easier than in the one shown in FIGS. 26 and 27. It's easy.

In addition, regarding the application of the coupling fitting hardware 13 shown in FIGS. 26 to 29, it can be used as described above except for FIGS. 23, 24, and 25. , in order to apply to the one in Fig. 25, Fig.
In Figure 1, the joint fitting hardware 13 is an eave, 1o',
This is a two-stage operation in which the slider slides once to the side surface of ii' and then slides further in the right angle direction.

In this case, the shape in FIG. 23 needs to be the same as the shape in FIG. 21.

As can be seen from the above explanation, conventionally, when using the workbench described above for large-scale movements offshore, the truss column 5 was divided into small parts by gas cutting, and then re-welded and re-joined, which took many days to restore after the movement. In the present invention, the combination of the box-shaped convex metal fittings and the coupling fitting fittings 13 makes it possible to reliably connect and release the truss columns with a small amount of time and human power, which is highly effective.

As for manufacturing costs, machining is, in principle, eaves 10',
11' at the component stage and only the machining of the joint fitting hardware 13, compared to the conventional method that required many days to restore and left an expensive workbench idle. If this happens, the cost will be significantly reduced.

In the description of the present invention, how many tons of eaves 10', 11(7)
Lka.

Although it has been explained that it is a slope within the friction angle, it is desirable but not an essential condition that it be a slope.

As an alternative to this slope, the R of the corners of the eaves 10' and 11' may be increased to a certain extent, the R of the inner corner of the coupling fitting hardware 13 is also adjusted, and the bolt hole of the eye plate 21 is provided with an allowance. 22 is tightened a little loosely, and if the gap between the fitting part of the eaves 10', 11' and the coupling fitting fitting 13 is kept within approximately 1%, there is no problem with the coupling device, and the manufacturing cost is even lower. Become.

In the coupling device of the present application, this is an external force, i.e.
The compressive force is applied to the horizontal plates 10, 11. The external force acting in the horizontal direction is
Since the tensile force of the box-shaped convex metal fitting 12 is completely separated and shared by the joint fitting fitting 13 and the eaves 10/11', even if there is a gap within IX at the fitting part, each metal fitting will not be damaged. This means that there is no effect on truss columns, and even more so on truss columns where the spacing between columns is several meters.

The gist of the present invention is to combine the powerful working force of the embodiment with the most effective shape of hardware, for example, hardware with compression resistance, shear resistance, or a shape close to resistance to shear, in a short working time,
Moreover, the present invention resides in a coupling device that can reliably connect and release truss columns by human power.

[Brief explanation of the drawing]

Figure 1 is a side view of the self-elevating work platform during work, Figure 2 is a side view of the work platform moving within the work area, Figure 3 is a partially enlarged side view of the truss column, and Figure 4 3 is a view taken along the line A-A in FIG. 3, FIG. 5 is an enlarged cross-sectional view of the truss column, FIG. 6 is an illustration of the external force acting on the fracture of the truss column, and FIG. 7 is a known truss column joint. Vertical cross-sectional view of the structure, Figure 8 is B in Figure 7
-B arrow view, Figure 9 is an enlarged plan view of the truss column equipped with the present invention, Figure 10 is a CC arrow view in Figure 9, and Figure 11 is a D-D arrow view in Figure 9. Figure 12 is a front view of Figure 11, Figure 13 is a view taken along the line E-E in Figure 9, Figure 14 is a view taken along line F-F in Figure 9, and Figure 15 is a view taken along line 13. , FIG. 14 is a front view of FIG. 14, FIG. 16 is an enlarged plan view of a truss column equipped with another embodiment of the present invention, and FIG. 17 is a partially enlarged view of FIG. 16.
Figure 18 is the 1st view from the GG arrow in Figure 16, and Figure 19 is the 1st view.
8 is a front view, FIG. 20 is an enlarged plan view of a truss column equipped with another invention, FIG. 21 is a view taken along the line H-H in FIG. 20, and FIG. 22 is a front view of FIG. 21. Fig. 23 is a view taken along the I-I arrow in Fig. 20, Fig. 24 is a front view of Fig. 23, and Fig. 25 is a front view of Fig. 23.
The figure is a J-J arrow view in Figure 20, and Figures 26 to 29 are
26 is a side view, FIG. 27 is a front view of FIG. 26, FIG. 28 is a side view of another shape, and FIG. 29 is a front view of FIG. 28. It is a diagram. a...Dimensions of subdividing the truss column, l...
...Dimensions of the truss column to be removed, L...Full length of the truss column, S...Length of the hinge, R...
・Radius of guide piece, 3... Workbench, 4...
...Elevating device, 5...Truss column, 5'...
...Truss support, 5", 5"'...Truss material,
10...Plate material installed horizontally at the bottom of the upper truss column, IOA...Fitting hole for box-shaped convex hardware, 10'...Eave, 10" ...Guide rail, 11...Plate installed horizontally at the top of the lower truss column, 11'...Eave, 12...
...Box-shaped convex hardware, 13...Connection fitting hardware, 14.15...Hinge, 16...
Pin, 18... Stopper 19...
Pin, 21... Eye plate, 22...
・Bolt, 24...Handle, 25.26...
... Hinge, 27 ... Pin, 29 ...
...Guide piece, 30.31...Hinge, 32.
...0. Pin, 34...Pin, 39...
...Rail, 40...Guide, 42...
・Stopper, 44... Workbench and rail, 45
...Guide rail, 46...Stopper.

Claims (1)

[Claims] 1. In a device that connects and releases truss columns of a self-elevating offshore work platform, an eave of the required width is installed horizontally from the cross section of the column at the upper end of the lower truss column and the lower end of the upper truss column, approximately parallel to the side surface of the column. A box-shaped convex metal fixture is planted approximately in the center of either the top or bottom of the board,
The truss struts are connected by drilling a hole in one side and fitting a convex metal fitting thereto, and further fitting a hinge-type coupling fitting fitting or a sliding coupling fitting fitting into the eaves of the upper and lower truss columns. A coupling device for truss supports.