JPS6332949B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a composite structure storage tank constructed from different structural materials such as steel plates and concrete or reinforced concrete.

Conventionally, there are two types of storage tank structures: steel structures made of thin steel plates and reinforced concrete structures, each of which has the following advantages and disadvantages. In other words, the former has excellent airtightness and waterproofness, but has problems such as buckling, insulation,
There are problems in terms of rust prevention, while the latter has problems with buckling, insulation,
Although it is excellent in terms of rust prevention, there is a problem in that it is inferior in airtightness and waterproofness. Therefore, a storage tank having a steel plate reinforced concrete structure is known as a storage tank that has solved this problem. This structural type uses steel plates as structural materials by placing steel plates on the inside of the storage tank and reinforced concrete on the outside, and has the advantages of both of the above structural types. Conventionally, the following methods have been researched and developed as methods for constructing this type of storage tank. One of them is Tokko Akira.
There is a method shown in Publication No. 52-19702, in which a first stage steel annular inner wall is first manufactured, a shear connector is welded to the outside of the inner wall, and reinforcing bars are then arranged through the shear connector. . Next, the inner side of the annular inner wall is reinforced with shoring, and outer formwork is provided at a predetermined interval using cylindrical form ties on the outside.
A first storage tank wall is formed by pouring concrete between the inner wall and the outer formwork. Next, a second storage tank is formed in the same manner, but in this case, shoring and outer formwork are attached using the holes formed in the first stage storage tank wall by the cylindrical form ties, and concrete is poured. A storage tank of a predetermined height is constructed by repeating such operations. Another construction method is the so-called slipform method, which is commonly used in constructing reinforced concrete storage tanks. However, among the above construction methods, the first one is
Because it is not a slip-form construction method, it is necessary to install temporary scaffolding all over the outside, and in addition to the type of work normally required for reinforced concrete storage tanks, work such as erecting and welding steel plates and installing shear belts is required. As a result, there is a problem that the work on site becomes complicated and construction efficiency is poor. In addition, when constructing a group of silos with main bins and width bins between the main bins, it is necessary to construct all the works at the same height at the same time, which requires a large number of workers, cranes, etc. In addition to the construction equipment required, it also requires a large number of skilled workers such as reinforcing bar workers, concrete workers, and machine operators, making the construction work complicated. In addition, the latter construction method uses the slipform construction method, so
When assembling steel plates, it is necessary to intersect the yokes, so the steel plates are formed into small pieces and welded together, which poses a problem in that the construction cost required for assembling the steel plates becomes extremely large. Furthermore, when constructing a group silo, it has the same difficulties as the former construction method described above. For this reason, we have developed a method in which the entire storage tank is made into parts, erected on site using factory-produced precast plates, welded joints, and filled with mortar to complete the storage tank. It has the advantage that it is similar to that of a storage tank, and the above-mentioned construction problems can be solved. However, this method requires high precision in the erection of the precast board, and therefore requires a great deal of effort and time to adjust the precision, resulting in major problems in terms of efficiency and precision.

The present invention has been researched and developed to overcome the drawbacks of the conventional panel assembly method of composite storage tanks.
The purpose of this invention is to provide a method for efficiently constructing a composite storage tank having a circular cross section with high construction accuracy.

Therefore, in the present invention, a composite structure storage tank having a circular cross section is constructed by the following procedure.

(a) A composite panel in which concrete is poured so that the shear connector is embedded in the outer surface of an arc-shaped steel plate having a shear connector and bolt hole hardware for attaching assembly hardware on the outer surface is placed from bottom to top. (b) When constructing a storage tank by assembling the steel plate in multiple stages, (b) As a composite panel from the second stage onwards, a width is provided on each outer surface of one of the top and bottom sides of the steel plate and one of the left and right sides. (c) Using a composite panel in which a backing metal is fixed so that one side in the direction protrudes from the edge of the steel plate, and an overlapping margin is formed where no concrete is poured on the other two sides where the backing metal is not fixed; (c) After positioning the composite panel on the lower composite panel with assembly hardware having adjusting bolt holes attached to its outer surface via the bolt hole hardware, (d) attaching the assembly hardware and the lower composite panel; The assembly hardware attached to the panel is connected by screwing adjustment bolts into the adjustment bolt holes of both panels at the top and bottom, so that the overlap margin and backing metal overlap between adjacent composite panels. (e) Then, between adjacent composite panels, pour mortar into the concrete gap and perform fillet welding between the edges of the overlap and the backing metal.

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

In the present invention, a composite panel 1 made of steel plates and concrete is first manufactured in a factory or the like prior to on-site construction. The object of the present invention is to construct a storage tank having a circular cross section, and therefore, as the steel plate 2, an arcuate steel plate that forms part of a circumferential ring is used. A large number of shear connectors 3 are attached to the arc-shaped outer surface of the steel plate 2, and bolt hole hardware 4 for attaching assembly hardware is also provided on the outer surface. It is preferable that a plurality of bolt hole hardware 4 be provided in the width direction of the steel plate. Then, concrete 5 is placed on the outer surface of the steel plate 2 as described above using a formwork (not shown), and a composite panel 1 made of the steel plate 2 and concrete 5 is manufactured. The concrete 3 is poured so that the shear connector 3 is embedded therein. Further, the tip of the bolt hole hardware 4 is exposed or protrudes from the concrete surface. In addition, in the concrete 5, reinforcing bars 6 such as wire mesh reinforcing bars as shown in Fig. 2 are installed to prevent cracking.
can be placed.

Such a composite panel 1 is assembled in multiple stages from bottom to top on site, but in the present invention, one of the top and bottom sides of the steel plate 2 and one side of the left and right sides are used as the composite panel 1 used in the second and subsequent stages. Backing metals 7 and 8 are fixed to each outer surface of one of the sides in such a way that one side in the width direction protrudes from the edge of the steel plate, and concrete is not placed on the other two sides where the backing metal is not fixed. A composite panel having a structure in which polymerization margins 201 and 202 are formed is used.

In this embodiment, the backing metals 7 and 8 are placed on the lower side and right side (not shown) of the steel plate 2, and on the overlapping margins 201 and 20.
2 are respectively provided on the upper side and the left side, and are adapted to overlap with the overlapping margins and backing metals of other adjacent composite panels, respectively. In addition, as will be described later, the composite panels are connected by backing metals 7, 8 and polymerization margins 201, 2.
They are joined by fillet welding the edges of the backing metals 7 and 8. In order to make such fillet welding possible, the width of the overlapping margins 201 and 202 is set to the width of the backing metals 7 and 8 from the edge of the steel plate. It is narrower than the protrusion width. Moreover, the concrete 5 is also placed on the back side of the backing metals 7 and 8.

In the present invention, first, the first stage composite panels 1 are connected in the circumferential direction and fixed to appropriate fixing portions by an appropriate method.

Next, the following construction is performed for the second and subsequent stages of composite panels 1a. That is, the composite panel 1a, with the assembly hardware 9a attached through the bolt hole hardware 4 at the lower part of its outer surface, is suspended and positioned on the lower (completed) composite panel 1 using a crane or the like. Further, in this state, the assembly hardware 9 is also attached to the bolt hole hardware 4 on the upper part of the lower composite panel 1. The assembly hardware 9, 9a has an adjusting bolt hole 91 extending vertically through it, and a mounting bolt 92 is protruded from the back, and the bolt 92 is screwed into the bolt hole of the bolt hole hardware 4. It can be attached to the composite panels 1a, 1 by inserting it. And composite panel 1 to be constructed
The adjustment bolts 10 are screwed vertically into the adjustment bolt holes 91, 91 of the assembly hardware 9a and the assembly hardware 9 attached to the composite panel 1 below the assembly hardware 9a. The composite panel 1a is positioned and fixed with respect to the lower composite panel 1. At this time, the adjuster bolts 10 are used to adjust the position of the composite panel 1a and adjust the erection accuracy. In this positioned state,
The backing metal 7 protruding from the lower edge of the steel plate 2 constituting the composite panel 1a overlaps with the overlapping margin 201 formed at the upper part of the lower composite panel 1, and the upper and lower ends of both steel plates are arranged with an appropriate gap. They are also facing each other. In addition, when assembling the second and subsequent composite panels 1a of each stage to be constructed, the lower constructed composite panel 1
Assembling is performed not only to the composite panels but also to the circumferentially adjacent composite panels. That is, in this embodiment, the backing metal 8 is fixed to the right side of the steel plate 2, and the overlapping margin 202 is formed on the left side.
As shown in FIG. 3, the composite panel 1a is assembled to the circumferentially adjacent composite panel 1 by overlapping the fastener 8 on the right side with the overlapping margin 202 of the steel plate 2 of the adjacent composite panel.

After positioning and fixing the composite panel 1a as described above, between the adjacent composite panels 1,
Mortar 11 (non-shrinking mortar) is poured into the gap in the concrete and the steel plates are welded together. In this welding, as shown in Fig. 2, the backing metal 7 and the steel plate overlap 201
Weld 12 between them by fillet welding. Similarly, in the circumferential direction, welding 13 is performed between the backing metal 8 and the overlapping margin 202 by fillet welding. Such pouring of mortar and welding of steel plates can be performed for each panel, or at an appropriate stage such as after all the composite panels in the circumferential direction have been assembled or after all the composite panels have been assembled. be able to.

According to the above-described procedure, the composite panels 1 are assembled, mortar is injected, and steel plates are welded to construct the walls, and finally the roof is installed to complete the construction. FIG. 4 shows a horizontal section of the storage tank constructed in this manner.

Note that the storage tank constructed by the method of the present invention is the fourth
A single storage tank (silo) with a circular cross section as shown in the figure
In the case of only will be working. Therefore, it is possible to make the steel plate bear only the tensile force and the concrete bear the compressive force, and as a result, the thickness of the wall cross section can be reduced to less than half that of conventional reinforced concrete storage tanks and steel plate reinforced concrete storage tanks. It is possible to do so at a lower cost. In addition, in the case of a single storage tank, the shear connectors only need to transmit the frictional force of the contents, so the number of shear connectors is about half that of a group silo where both sides of the wall are used as storage tanks.

According to the present invention described above, the steel plates are joined together by a lap joint using the overlapping margin of the backing steel plate, and the position of the composite panel is adjusted using the assembly hardware and the adjusting bolt holes. The construction accuracy of each composite panel can be appropriately and easily adjusted, and therefore a composite structure storage tank having a circular cross section can be efficiently and precisely constructed, which is an excellent effect.

[Brief explanation of the drawing]

Figures 1 to 3 show the state of implementation of the present invention, with Figure 1 being a front view showing how the composite panel is assembled with the lower composite panel, and Figure 2 being the same as shown in Figure 1.
FIG. 3 is a horizontal sectional view partially showing how one composite panel is assembled with a circumferentially adjacent composite panel. FIG. 4 is a cross-sectional view of the water surface of a storage tank constructed by the method of the present invention. In the figure, 1 and 1a are composite panels, 2 is a steel plate, 3 is a shear connector, 4 is bolt hole hardware, 5 is concrete, 7 and 8 are backing metals, 9 and 9a are assembly hardware, 10 is an azimuth bolt, 11 is mortar, 12 and 13 are welded parts, 91 is an adjustment bolt hole, and 201 and 202 are polymerization margins.

Claims (1)

[Claims] 1. A composite panel in which concrete is poured so that the shear connector is embedded in the outer surface of an arc-shaped steel plate having a shear connector and bolt hole hardware for attaching assembly hardware on the outer surface, is placed from bottom to top. When constructing a storage tank by assembling multiple stages, as a composite panel from the second stage onwards, one side in the width direction has a steel plate edge on each outer surface of one of the upper and lower sides of the steel plate and one of the left and right sides. A composite panel is used, in which a backing metal is fixed so as to protrude from the outer surface of the composite panel, and a polymerization margin is formed on the other two sides where the backing metal is not fixed, and no concrete is poured. After installing the assembly hardware having the adjusting bolt hole through the bolt hole hardware and positioning it on the lower composite panel, the assembly hardware and the assembly hardware attached to the lower composite panel are both attached. By screwing the adjustment bolts into the adjustment bolt holes at the top and bottom of the panel and connecting them, it is positioned and fixed so that the overlap margin and backing metal overlap between the adjacent composite panels. A method for constructing a composite structure storage tank having a circular cross section, characterized by injecting mortar into a concrete gap between the composite panel and performing fillet welding between the edge of the polymerization margin and the backing metal.