JPH0127222B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of constructing a rectangular group silo lined with iron plates used for bulk storage of grain.

[Prior art]

Grain silos require airtightness because fumigation is performed to exterminate pests in the grain.

Conventional grain silos are constructed of reinforced concrete or steel plates, both of which have drawbacks as discussed below.

Reinforced concrete silos have advantages such as low construction costs and good insulation, but they are not airtight and require internal finishing. Furthermore, even if airtightness is ensured during construction, the airtightness gradually deteriorates as the concrete changes over time.

Iron plate silos have excellent airtightness and do not require internal finishing, but it is difficult to use secondary bins as group silos, the construction cost is relatively high, the insulation effect is poor, and the running of the exterior anti-rust coating is difficult. In addition to being expensive, there are many other drawbacks, such as local buckling caused by the internal negative pressure generated during grain discharging.

[Purpose of the invention]

This invention was devised in view of the above problems, and provides a method for constructing large square group silos with iron plates that are highly airtight, have good insulation effects, are inexpensive to construct, and are sturdy. The purpose is to

[Structure of the invention]

The method for constructing a rectangular group silo lined with steel plates according to the present invention is for work in which steel rods are erected at the top of foundations constructed of reinforced concrete or the like at predetermined intervals to support peripheral formwork and work scaffolding. A gate-shaped steel frame is erected so as to be able to rise along the steel bars, steel members are erected to a certain height inside the outer peripheral formwork, and a steel plate provided with a slip stopper on the concrete contact surface is welded to the steel members. After fixing to form a rectangular cylindrical inner wall and pouring concrete between the inner walls and between the inner wall and the outer peripheral wall, the working gate-shaped steel frame is raised to a certain height, and the following steps are repeated sequentially. It is characterized by this.

〔Example〕

The present invention will be explained below based on embodiments shown in the drawings.

(1) As shown in Figure 1, hopper support beams 1, which will serve as the silo foundation, are constructed with reinforced concrete, facing each other at a predetermined interval.

(2) As shown in Figure 2, attach the steel bar 8 to the hopper support beam 1.
erected on the top surface of the outer peripheral formwork 2 and work scaffolding 3.
A gate-shaped steel frame 4 for supporting work is erected so as to be able to rise along steel bars 8, and an outer peripheral formwork 2 and internal and external work scaffolds 3 are fixed to the steel frame 4.
Further, jacks 9 are set on the steel rods 8 for raising the steel frame to which the outer peripheral formwork 2 and the work scaffolding 3 are fixed.

(3) As shown in Fig. 3, a steel frame member 5 of a certain height is erected on the hopper support beam 1, and a steel plate 6 on which a shear stopper, etc. has been attached in advance, is fixed to the steel frame member 5 by welding. Build a cylindrical inner wall. Next, concrete pouring piping 10 is installed between the top of the working gate-shaped steel frame 4 and the steel plates 6, 6, and between the outer peripheral formwork 2 and the steel plates 6.

The steel plates 6 that make up the inner wall are supported by a jig 7 that is supported by the working gate-shaped steel frame 4, so they are kept safe without being deformed even by lateral pressure during concrete pouring. .

(4) As shown in Figure 4, reinforcing bars 11 for the outer peripheral wall are placed and concrete is poured.

After concrete curing, the outer peripheral formwork 2 and work scaffolding 3 are slid up by jacks 9,
Perform demolding.

(5) As shown in FIG. 5, after temporarily fixing the outer peripheral formwork 2 and the work scaffolding 3 at a predetermined height, the upper steel frame member 5 is erected. Next, the jig 7 that supports the steel plate 6 is pulled into the working portal steel frame 4 side, and the steel plate 6 is welded and fixed to the erected steel member 5. After the welding work is completed, the jig 7 is moved to its original position to support the iron plate 6.

(6) As shown in Figure 6, reinforcing bar 1 for the upper outer peripheral wall
1 and pour concrete to the specified position.

(7) As shown in Figure 7, the upper reinforcing bar 1
1 and pour concrete up to the top of the iron plate 6.

After concrete curing, perform demolding work as described in the latter part of (4).

Thereafter, operations (5) to (7) are repeated in order until a predetermined height is reached to construct a group of silos.

Incidentally, in the embodiment described above, the attachment state of the steel frame member 5 and the steel plate 6 is as follows.

FIG. 8 is a plan view of the silo under construction, and as shown, four rectangular cylindrical inner walls are formed inside the silo. Each inner wall is composed of four iron plates 6, and between the iron plates 6, 6 and an outer peripheral formwork 2 (not shown)
As described above, concrete is placed between the steel plate 6 and the iron plate 6. Steel members 5 made of groove-shaped steel are placed at each corner of the inner wall made of iron plates 6, forming a frame of the inner wall.

In addition, as shown in FIG.
is attached, and the concrete to be poured later and the steel plate 6 are bonded and integrated to reinforce the concrete wall. Therefore, the thickness of the concrete wall can be reduced, making it lightweight and economical. Further, it is possible to reduce the decrease in load-bearing capacity due to buckling.

〔Effect of the invention〕

This invention consists of the above structure, and can obtain the following effects.

(1) A highly airtight silo whose entire inner wall is made of iron plates can be easily constructed by raising a work portal frame along steel rods.

(2) Since the steel plate that forms the inner wall is provided with a stopper on the concrete contact surface, the adhesion between the concrete wall and the steel plate is strong, and the thickness of the concrete wall can be reduced, making it lighter. can be achieved, and construction costs can be reduced.

(3) For the same reason, the reduction in load bearing capacity due to buckling can be reduced, and a sturdy group silo can be provided.

[Brief explanation of drawings]

1 to 7 are schematic diagrams showing an embodiment of the construction method of the present invention, FIG. 8 is a plan view of the silo during construction, and FIG. 9 is a perspective view of the iron plate constituting the inner wall. 1...Hopper support beam, 2...Perimeter formwork, 3...
Work scaffolding, 4... Gate type steel frame for work, 5...
...Steel frame member, 6...Steel plate, 7...Jig, 8...Steel bar, 9...Jet, 10...Piping for concrete placement, 11...Reinforcement bar, 12...Shikotsuta.

Claims (1)

[Claims] 1. Steel rods are erected on top of foundations constructed of reinforced concrete, etc., facing each other at predetermined intervals, and a gate-shaped steel frame for work that supports the outer formwork and work scaffolding can be raised along the steel rods. A steel frame member is erected to a certain height inside the outer peripheral formwork, and a steel plate with a slip stopper provided on the concrete contact surface is welded and fixed to the steel frame member to form a rectangular cylindrical inner wall. After pouring concrete between the inner walls and between the inner wall and the outer peripheral wall, the working gate-shaped steel frame is raised to a certain height, and the following steps are repeated in sequence. Construction method.