JPS6145751B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of constructing a steel silo.

Steel cylindrical silos are commonly used for storing grain, feed, etc. Such a silo is generally constructed by stacking a plurality of circumferential rings (side plate rings) and welding and joining each circumferential ring. Conventional construction methods include the methods shown in Figure 1 A to I. is taken. That is, this method is as shown in A-a and E-b of the same figure.
A circular scaffold 13 is supported on a plurality of brackets 12a protruding from the inner surface of the circumferential rings 3a, and a worker on the scaffold 13 welds the circumferential rings 3b stacked on top. Note that a indicates the inner circumferential welding location. Cutouts 14 corresponding to each of the brackets 12 are provided at a plurality of locations on the periphery of the scaffold 13.
is provided, and after welding of one circumferential ring 3b is completed, the wire 1 is removed by a crane (not shown).
5, lift the scaffold 13 through each bracket 1
Scaffolding 13 so that notch 14 is located above 2a
After that, the scaffold 13 is lowered to a predetermined range so that the bracket 12a passes through the notch 14. In this state, as shown in FIG. 1C, the worker on the scaffold 13 cuts and removes the bracket 12a, and after completing the cutting, the worker lifts the scaffold 13 and attaches the previously welded circumferential ring 3b. This is to be supported by the bracket 12b.Contrary to the above, the scaffold 13 is lifted by passing the bracket 12b through each notch 14, and the scaffold 13 is suspended from the bracket 1.
Scaffold 1 is positioned above 2b, and the notch 14 and bracket 12b are vertically shifted from each other.
3, and then, as shown in FIG. 1D, the scaffold 13 is supported by the bracket 12b. Once the scaffolding 13 is in place in this way, the hook of the crane is removed from the wire 15, and another circumferential ring 3 is piled up using the crane. By repeating the above-described cycle, an arbitrary number of circumferential rings 3 can be assembled. Stacked and welded together. When welding of the uppermost circumferential ring 3 is completed in this way, as shown in FIG.
and arranges, attaches, and welds the roof panels 17. In this case, in order to provide a removal hole 18 for removing the scaffolding, some of the roof ribs and roof plates are left unattached. Next, the scaffold 13 is taken out, but this scaffold 13 can be folded in half via the hinge 19, so the uppermost circumferential ring 3 is removed using the same method as described above. After cutting and removing the bracket 12, the scaffold 13 with the worker on it is lowered to the hopper 20 at the bottom of the silo, and is supported on the upper edge of the hopper 20 as shown in FIG. At this point, the operator changes the hanging point position of the wire 15 and releases the device for preventing the wire from breaking in two, and the operator exits the silo through the manhole 21 of the hopper 20. Thereafter, the scaffold 13 is lifted up by a crane, and as a result of this lifting, the scaffold 13 is folded in two as shown in FIG. And like this, scaffolding 1
After taking out the silo, roof ribs and roof plates are attached to the take-out hole 18, as shown in FIG. According to this conventional construction method, there is no particular problem with the completed structure itself, but generally, such silos are constructed not as a single silo but as a group, so it is difficult to construct multiple silos. When constructing a silo, a large number of scaffolds are required in addition to the silo itself, and there is a problem in that it is necessary to perform complicated and dangerous work to finally remove the scaffolds.

The present invention was created to solve the problems of the conventional method, and its purpose is to propose a method that can efficiently construct steel silos while ensuring the safety of workers, etc. shall be.

For this reason, the present invention provides a structure for a roof, which is composed of an aggregate and a plate attached to the upper part thereof, and has a smaller diameter than the inner diameter virtually formed by the tips of a plurality of roof mounting brackets provided on the uppermost circumferential ring. By suspending and holding the body inside the circumferential ring, it can be used as a scaffold for welding the inner circumference of the circumferential ring,
After assembling the circumferential ring, the roofing structure is pulled out from the top of the uppermost circumferential ring, and attached equipment is installed on the ground, etc. After that, the roofing structure is hoisted to the top of the silo, and its aggregate is It is attached and fixed to the top circumferential ring by connecting it to a roof mounting bracket, and then a blocking plate is attached to the gap between the circumferential edge of the roof structure and the top circumferential ring. As a result, a silo can be constructed efficiently and quickly without requiring special scaffolding and therefore without performing complicated and dangerous removal work.

An embodiment of the steel silo construction method according to the present invention will be described below.

The present invention uses a roof structure as a scaffold on which a worker rides to weld and join steel circumferential rings (side plate rings). As shown in Fig. 3, this structure consists of an aggregate 101 and a plate 102 attached to the top of the aggregate, and as the circumferential rings are piled up, they are successively lifted upward, and finally the top It is attached and fixed to a plurality of roof mounting brackets provided on the circumferential ring. Prior to this installation and fixing, the roof structure is pulled out from the top of the uppermost circumferential ring, lowered to the ground, installed with necessary accessories, etc., and then lifted up again. The roof structure is installed at the top of the silo, and the diameter of the roof structure is smaller than the inner diameter virtually formed by the tips of the plurality of roof mounting brackets in order to enable extraction from the uppermost circumferential ring. be done.

FIGS. 2A to 2H show specific embodiments of the method of the present invention, and 1 shows a roof structure. In this embodiment, the roof structure 1 is first suspended inside the circumferential ring 3a by a crane via the wire 2, and the roof structure 1 is locked inside the circumferential ring 3a to form a scaffold. . That is, the second
As shown in Figures A-a and E-b, the circumferential ring 3a
A plurality of support pieces 4a for supporting the roof structure 1 are protruded from the upper inner peripheral surface of the roof structure 1, and a scaffold is formed by removably suspending the roof structure 1 from the support pieces 4a. It is something to do.

The details are as shown in FIG. , 6' are suspended from and held by a hanging device 5 consisting of a wire 7 detachably attached to the support piece.

In this way, with the scaffold formed, the hook of the crane is removed from the wire 2 of the roof structure 1, and the next circumferential ring 3b is stacked by the crane, and the worker on the roof structure 1 An inner circumferential weld connection is made. Next, the roof structure 1 is lifted and held by the crane again as shown in FIG. . Next, the roofing structure 1 is lifted up with the worker on it, and suspended and held by the hanging tool 5 on the support piece 4b of the stacked circumferential rings 3b in the same manner as described above. By repeating the above cycle, the circumferential rings 3 are stacked one after another and welded together.

When the welding of the uppermost circumferential ring 3 and the cutting and removal of its support piece 4 have been completed,
The roof structure 1 is taken out from above the circumferential ring 3 and temporarily lowered to the ground. On the ground, auxiliary equipment (not shown) is installed.

The roof structure 1 that has been installed is lifted up to the top of the silo again, and here, as shown in FIG. When connected, it is installed and fixed. For example, as shown in FIGS. 4A and 4B, when the aggregate 101 of the roof structure 1 is a girder, the end of the beam and the end of the roof mounting bracket 8 are connected by a plate 9 using bolts. In addition, when the aggregate 101 is a small beam as shown in FIG. Any suitable method, such as welding to the roof mounting bracket 8, can be used.

With the roof structure 1 mounted and fixed in this manner, a gap 10 corresponding to approximately the protruding length of the roof mounting bracket 8 remains between the peripheral edge of the roof structure 1 and the circumference ring 3. . Finally, as shown in FIG. 2E, a closing plate 11 is attached over the gap 10, thereby almost completing the construction of the silo.

According to such a construction method, there is no need to prepare scaffolding materials separately from silo construction materials, and of course there is no need to perform work to remove them. In addition, there is a method in which the roof structure 1 is suspended from the support piece 4 on the top of each circumferential ring 3 to form a scaffold, and after welding, the scaffold is suspended by a crane or the like and the support piece 4 is cut and removed. Therefore, it is possible to avoid the conventional troublesome work of lowering the scaffold to cut and remove the bracket and aligning it with the bracket.

According to the method of the present invention described above, the silo roof structure 1 is used as a scaffold for welding the inner circumference of the peripheral ring, and is finally attached and fixed to the roof mounting bracket 8 on the top of the silo. Therefore, there is no need to prepare scaffolding separately from the silo construction materials as in the past, and the inevitably complicated and dangerous work of removing scaffolding can be avoided, reducing costs and work when constructing steel silos. safety can be ensured. In addition, the roof structure 1 used as a scaffold consists of an aggregate 101 and a plate 102 stretched over the aggregate, and the worker can work on the plate 102, so it can be used as a scaffold. is extremely suitable and allows welding work of circumferential rings at high places safely. Furthermore, while the roof structure 1 can be used as a highly safe scaffold in this way, the aggregate 101 is connected to the roof mounting bracket 8 of the circumferential ring 3, and the periphery and the circumferential ring are connected to each other. The roof can be constructed simply by attaching the blocking plate 11 to the gap 10, and additional equipment on the roof can be installed all at once on the ground. This has the effect of allowing silo construction to be carried out efficiently and quickly.

[Brief explanation of the drawing]

FIGS. 1A to 1L are explanatory diagrams showing the conventional silo construction method in the order of steps. FIGS. 2A to 2E are explanatory diagrams showing the silo construction method according to the present invention in the order of steps. FIG. 3 is an explanatory diagram partially showing the support structure of the scaffold by the roof structure. Figures 4A and 4B partially show an example of the structure for attaching the roofing structure to the top of the silo, of which A is a vertical sectional view and B is a view with the cover plate removed. FIG. FIGS. 5A and 5B show another embodiment, in which A is a longitudinal sectional view and FIG. 5B is a plan view with the closing plate removed. In the figure, 1 is a roof structure, 3, 3a, 3b
is the circumferential ring, 8 is the roof mounting bracket, 101
102 indicates an aggregate, and 102 indicates a plate.

Claims (1)

[Claims] 1 In a method of constructing a steel silo by stacking multiple steel circumferential rings and welding them together, the steel silo consists of an aggregate and a plate attached to the top of the aggregate, and is installed on the top circumferential ring. By suspending and holding a roof structure with a diameter smaller than the inner diameter virtually formed by the tips of the plurality of roof mounting brackets attached to the top of the circumferential ring, it can be used as a scaffold for welding the inner circumference of the circumferential ring. After assembling the shell ring, the roof structure is pulled out from the top of the uppermost circumferential shell ring, and attached equipment is installed on the ground, etc. After that, the roof structure is hoisted to the top of the silo, and the aggregate is placed on the roof. A method of constructing a steel silo, which comprises attaching and fixing the steel silo to the uppermost circumferential ring by connecting it to a mounting bracket, and then attaching a closing plate to the gap between the circumferential edge of the roof structure and the uppermost circumferential ring.