JP2021139216A - Corrugated thin steel plate for silo, and grain silo comprising combination of the same - Google Patents

Abstract

To provide a corrugated thin steel plate for a silo comprising a thin steel plate, capable of securing airtightness, and capable of assembling with high accuracy, and to provide a silo comprising a combination of the same.SOLUTION: A corrugated steel plate 1 for a silo is used to construct a silo: which is formed in a cylindrical curved surface body with an arc-shape in plan view of corrugated steel plates having through holes 2; which is joined in a circumferential direction and a vertical direction by joint members such as a bolt and a rivet inserted in the through holes 2; and which has a joint portion in which three or more end portions are stacked and comprises a cylindrical or semi-cylindrical wall body portion. The through holes 2 are round holes with no play for length adjustment. A plate thickness of the thin steel plate is smaller than 2.7 mm.SELECTED DRAWING: Figure 3

Description

The present invention relates to a corrugated steel plate for silos and a silo in which they are combined, and more particularly to a corrugated thin steel plate for silos made of a thin steel plate and a silo for grains in which they are combined.

Conventionally, a plurality of corrugated steel plates, which are cylindrical curved surfaces having an arcuate shape in a plan view, are joined to form a cylindrical wall body, which is used as a storage tank for silos, aggregate bottles, powder / granular material storage tanks, water tanks, etc. Is being done.

For example, in Patent Document 1 proposed by the applicant of the present application, in a loose material storage tank for storing loose objects in a storage tank main body in which a peripheral wall 15 is connected in a cylindrical shape, the storage tank main body 11 has a corrugated sheet 21 in the circumferential direction. A partition structure 12 is provided, which is connected in the vertical direction to form a peripheral wall 15, is connected to the corrugated sheet 21 via a closing plate 16, and is extended so as to partition the storage tank main body 11 in a plan view. The closing plate 16 discloses a loose storage tank in which the distance between the end portion of the partition structure 12 and the corrugated sheet 21 is closed so that the distance can be freely separated (Claims of Patent Document 1). 1, Paragraphs [0021] to [0036] of the specification, FIGS. 1, 3 and the like in the drawing).

The loose material storage tank described in Patent Document 1 is intended to store loose materials such as grains, coal, and cement aggregates, and in particular, only lightweight materials such as grains such as rice, wheat, corn, and soybeans are stored. It wasn't what I expected. Therefore, the corrugated sheet used was also a corrugated steel plate made of a medium plate or a thick steel plate of 2.7 mm (3 mm) or more. Therefore, there is a problem that the portion where the corrugated steel plates of the same shape are joined is unreasonable, and it cannot be assembled into a cylindrical wall body unless the portion where the corrugated steel plates of the same shape are joined is adjusted by providing an elongated hole in the portion where the bolts are joined.

In such a loose storage tank, two corrugated steel plates are joined in the circumferential direction in order to make it cylindrical, and one corrugated steel plate is further joined in order to connect them vertically. In this way, the joints where the ends of the three corrugated steel sheets are overlapped with each other are combined with objects of substantially the same shape, so there is inevitable misalignment. Does not fit and cannot be joined. Therefore, such corrugated steel sheets are joined (connected) by connecting members such as bolts and rivets through elongated holes penetrating in the plate thickness direction, and are joined (connected) between the connecting member and the elongated holes in the plate thickness direction. There is a problem that the airtightness of the loose material storage tank itself cannot be ensured because a gap is formed through the tank.

For this reason, when the stored material is grains or the like, there arises a problem that the storage material is rotted or the quality is deteriorated due to the influence of humidity or the like. Therefore, in the loose material storage tank used as a silo for grains, as a measure against humidity, bolts are joined as described above, and corrugated steel plates are welded to each other by fillet welding or the like. However, in order to weld steel plates to each other, there is a risk of penetrating the base metal during welding, so a new problem arises in which thin steel plates of less than 2.7 mm cannot be welded as a measure against moisture. Therefore, thin steel sheets having a thickness of less than 2.7 mm have not been used in conventional corrugated steel sheets for silos used in bulk storage tanks and the like.

However, since such a corrugated steel sheet can be made corrugated to increase its strength and rigidity, the corrugated steel sheet used as the outer shell of a silo for storing lightweight materials such as grains has a thickness of 2. It was over-engineered to make it 7 mm or more. Therefore, a corrugated steel sheet made of a thin steel sheet and capable of ensuring airtightness has been desired.

In addition, Patent Document 2 discloses a silo that maintains airtightness by interposing packings 5, 6 and 7 between the corrugated steel plate (corrugated plate 1) and the corrugated steel plate (utility of Patent Document 2). Refer to claim 1, the scope of the request for utility model registration, page 1, line 14 to line 7, line 7 of the specification, and FIG. 2 of the drawing).

However, although the silo described in Patent Document 2 is interspersed with packings 5, 6 and 7, the silo must have a long hole at the joint portion where the ends of the three corrugated steel plates are overlapped with each other. For example, it was not possible to solve the above-mentioned problem that the joint could not be performed and the airtightness could not be maintained due to the gap.

Further, Patent Document 3 discloses a covered corrugated aggregate bin made of a corrugated steel plate corrugated sheet (Patent Document 3 specification, page 1, line 17 to page 6, line 2). , Refer to FIGS. 1 and 3 of the drawing).

However, the covered corrugated aggregate bottle described in Patent Document 3 is designed to be able to store heavy objects such as coal, coke, ore, and has the above-mentioned problems of using a thin steel plate and a joint portion. No consideration was given.

Also, even if the silo is assembled, if the assembly accuracy of the finished product when assembled is poor, the accuracy of the roundness and diameter of the silo will be low, which will affect the attachment of members such as hoppers and roofs. , May interfere with its use as a silo. In other words, if the bolt holes are long holes with priority given to being assembled, the roundness and diameter of the assembled silo will be low due to the large backlash, and it will be used as a silo. May cause problems. Therefore, it has been required that the wall body in which the corrugated steel plate is assembled has high assembly accuracy, that is, it can be accurately assembled as a silo from the corrugated steel plate.

Japanese Unexamined Patent Publication No. 2004-270262 Jikkai Sho 51-163632 Jikkai Sho 55-178501

Therefore, the present invention has been devised in view of the above-mentioned problems, and an object of the present invention is a corrugated thin steel plate for silos, which is made of a thin steel plate, can ensure airtightness, and can be assembled with high accuracy. And to provide silos in which they are combined.

The corrugated thin steel plate for a silo according to the first invention is formed from a corrugated steel plate having a through hole into a cylindrical curved body having an arc shape in a plan view, and is a joining member such as a bolt or a rivet inserted through the through hole in the circumferential direction. A corrugated steel sheet for silos for constructing a silo having a joint portion which is joined in the vertical direction and has three or more overlapping ends and which has a cylindrical or semi-cylindrical wall portion. The through hole is a round hole having no play for adjusting the length, and is made of a thin steel plate having a plate thickness of less than 2.7 mm.

The corrugated thin steel plate for silos according to the second invention is formed from a corrugated steel plate having a through hole into a cylindrical curved body having an arc shape in a plan view, and is a joining member such as a bolt or a rivet inserted through the through hole in the circumferential direction. A corrugated steel sheet for silos for constructing a silo having a joint portion which is joined in the vertical direction and has three or more overlapping ends and which has a cylindrical or semi-cylindrical wall portion. The through hole is a round hole having no play for adjusting the length except for the through holes formed at the four corners, and is made of a thin steel plate having a plate thickness of less than 2.7 mm.

In the first invention or the second invention, the corrugated thin steel plate for silo according to the third invention has bolts and nuts as the joining members, and when the plate thickness is 0.27 mm or more and 1.20 mm or less, the round hole is formed. The diameter is equal to or greater than the value obtained by adding 1 mm to the diameter of the bolt and equal to or less than the value obtained by adding 4 mm to the diameter of the bolt. Is greater than or equal to the value obtained by adding 2 mm to the diameter of the bolt and less than or equal to the value obtained by adding 6 mm to the diameter of the bolt. It is characterized in that the value is equal to or more than the value obtained by adding 3 mm to the diameter of the bolt and equal to or less than the value obtained by adding 7 mm to the diameter of the bolt.

The grain silo according to the fourth invention is a grain silo for storing grains such as rice, wheat, corn, and soybean, and the corrugated thin steel plate for silo according to any one of claims 1 to 3 is used. It is characterized in that it has three or more superposed joint portions and is combined and joined in the circumferential direction and the vertical direction.

The grain silo according to the fifth invention is characterized in that, in the fourth invention, the joint portions in which three or more of the silos are overlapped are not welded.

According to the first to fifth inventions, by forming the steel sheet from a thin steel plate, weight reduction can be achieved while maintaining the required strength and rigidity, and the product can be manufactured at low cost. Further, according to the first to fifth inventions, the airtightness can be maintained as a silo by forming the through hole to be joined into a round hole having no play for adjusting the length. Moreover, according to the first to fifth inventions, the handling performance at the time of assembly construction can be improved by utilizing the fact that the thin steel plate is easily bent and twisted, and the silo can be assembled with high accuracy.

In particular, according to the third invention, the silo can be assembled more accurately, and the construction time for assembling the silo can be reduced.

In particular, according to the fifth invention, since the joint portion is not welded, the grain silo can be manufactured at low cost in a short time by that amount.

FIG. 1 is a diagram showing a grain silo according to the present embodiment, FIG. 1 (a) is an elevational view of the grain silo according to the present embodiment, and FIG. 1 (b) is a horizontal cross section thereof. It is a figure. FIG. 2 is a development view of the wall body of the grain silo of the same as above. 3A and 3B are views showing a corrugated thin steel plate for a silo according to the first embodiment of the present invention. FIG. 3A is a front view of the corrugated thin steel plate for a silo, and FIG. 3B is a plan view thereof. 3 (c) is an enlarged front view of part A showing the vicinity of the through holes at the four corners. FIG. 4 is a right side view of a corrugated thin steel plate for silos. FIG. 5 is a vertical cross-sectional view showing a joint portion for bolt-joining corrugated thin steel plates for silos, and FIG. 5 (a) is a vertical cross-sectional view showing a joint portion in the vertical direction of a general portion. b) is a vertical cross-sectional view showing a joint portion in which three or more end portions where the joint portion in the circumferential direction and the joint portion in the vertical direction overlap are overlapped. 6A and 6B are views showing a corrugated thin steel plate for a silo according to a second embodiment of the present invention. FIG. 6A is a front view of the corrugated thin steel plate for a silo, and FIG. 6B is a plan view thereof. 6 (c) is an enlarged front view of a portion B showing the vicinity of the through holes at the four corners.

Hereinafter, the corrugated thin steel plate for silos and the silo for grains according to the embodiment of the present invention will be described in detail with reference to the drawings.

<Cereal silo>
First, the grain silo according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing a grain silo 10 according to the present embodiment, FIG. 1 (a) is an elevational view of the grain silo 10 according to the present embodiment, and FIG. 1 (b) is an elevational view thereof. It is a horizontal sectional view. Further, FIG. 2 is a developed view of the wall body 11 of the grain silo 10 shown in FIG.

The grain silo 10 is a grain silo (for lightweight items) for the purpose of storing lightweight items such as grains such as rice, wheat, corn, and soybean, and in the present embodiment, a 200t size is exemplified. explain. Lightweight materials are lighter (smaller) than sand, ordinary soil, gravel, etc., which have a bulk specific gravity of 1.0 t / m ^{3 or less, such as rice, wheat, corn, and soybeans.} pointing.

As shown in FIG. 1A, the grain silo 10 is a cylindrical wall body 11 in which a corrugated thin steel plate 1 for a silo, which will be described later, is combined and joined in the circumferential direction and the vertical direction, and the wall body thereof. It is composed of a roof 12 erected above the eleven and the like. Further, at the position of ▽ shown in FIG. 1 (b), reinforcing columns made of H-shaped steel or the like (not shown) are installed at a predetermined pitch (1500 mm pitch in the illustrated form).

(Wall body)
As shown in FIG. 1 (b), in the wall body 11, nine corrugated thin steel plates 1 for silos are connected by overlapping the ends by 100 mm in the circumferential direction, and the outer diameter is D1 (in the illustrated embodiment). , 8,594 mm), which is a cylindrical wall body. Of course, the wall body 11 may be a wall body having a long hole shape in a plan view having a straight line portion. In short, the grain silo 10 according to the present invention is half-walled regardless of the number of silo corrugated thin steel plates 1 joined in the circumferential direction or whether a linear corrugated steel plate is inserted in the middle. It suffices if there is a cylindrical part.

As shown in FIG. 2, the wall body 11 is formed by stacking corrugated thin steel plates 1 for silos by 19 mm in each step in the vertical direction and combining them in an eight-tiered manner, and joins the corrugated thin steel plates 1 for silos to each other. The parts are joined in a silo shape so that the upper and lower parts are staggered and stress is not concentrated. In addition, Δ shown in FIG. 2 also indicates the installation of the reinforcing column, as in the case of ▽ in FIG.

Further, as shown in FIG. 2, the wall body 11 gradually becomes thicker as the corrugated thin steel plate 1 for silo goes to the lower stage in order to oppose the internal pressure that increases according to the stacking height of the contents such as grains. It is configured as follows. Specifically, the plate thickness t = 1.2 mm of the corrugated thin steel plate 1 for silos in the lower two stages, the plate thickness t = 1.0 mm in the middle three stages above it, and the plate thickness t = in the upper three stages above it. It is 0.8 mm. Needless to say, the thickness of the corrugated thin steel plate 1 for silos may be appropriately selected according to the scale (t size) of the silo 10 for grains, the size of the diameter D1, the number of stacks, and the like. ..

(roof)
The roof 12 is a truncated cone-shaped roof having a circular opening 12a formed in the center in a plan view, and has a roof slope θ1 (in the embodiment, θ1 = 30 °) as shown in FIG. It is a roof.

<Corrugated thin steel plate for silos>
[First Embodiment]
Next, the corrugated thin steel plate 1 for silos according to the first embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 is a view showing the corrugated thin steel plate 1 for a silo according to the first embodiment of the present invention, and FIG. 3A is a front view of the corrugated thin steel plate 1 for a silo seen from the inside of the wall body 11. FIG. 3B is a plan view thereof, and FIG. 3C is an enlarged front view of part A showing the vicinity of the through holes at the four corners. Further, FIG. 4 is a right side view of the corrugated thin steel plate 1 for silo.

The corrugated thin steel plate 1 for a silo is made of a corrugated steel plate formed in a corrugated manner in order to increase rigidity, and is a grain for forming a wall body 11 of the above-mentioned grain silo 10 formed in a cylindrical curved body having an arc shape in a plan view. It is a steel plate for a silo. The corrugated thin steel plate 1 for silos is a corrugated thin steel plate made of a thin plate (thin steel plate) of less than 2.7 mm. The type of steel material of the corrugated thin steel sheet 1 for silo may be a general type of steel sheet, for example, hot-rolled steel sheet (SPH), hot-rolled steel sheet (SPHC), cold-rolled steel sheet (SPCC), electricity. Examples thereof include zinc-plated steel sheet (SECC), hot-dip galvanized steel sheet (SGCC), electroplated steel sheet (SPTE), hot-dip zinc-aluminum-magnesium alloy-plated steel sheet (SGMC, SGMH), and the like.

As shown in FIG. 3A, the corrugated thin steel plate 1 for a silo is a steel plate having a rectangular shape when viewed from the inside of the wall body 11, and as shown in FIG. 3B, it is a circle in a plan view. It is formed in the shape of a cylindrical curved surface that forms part of an arc-shaped cylindrical body. In the illustrated form, the corrugated thin steel plate 1 for a silo has a rectangular shape having a width W1 (W1 = 3100 mm in the illustrated form) × a height H1 (H1 = 1058 mm in the illustrated form). The radius of curvature of the arc is R = D1 / 2.

Then, as shown in FIG. 3A, a plurality of through holes 2 are formed in the silo corrugated thin steel plate 1 as bolt holes for joining the silo corrugated thin steel plates 1 to each other. In the corrugated thin steel sheet 1 for silos according to the present embodiment, as shown in FIG. 3C, all of these through holes 2 are for adjusting the length having a diameter slightly larger than the nominal diameter of the bolt described later. It is a round hole with no play. The phrase "there is no play for adjusting the length" will be described in detail later based on the test results, including specific numerical values.

As shown in FIG. 3A, the through holes 2 are round holes for joining in the circumferential direction in the peaks 1a and valleys 1b at the left and right ends of the corrugated thin steel plate 1 for silos, respectively. A total of two rows are provided, one row at a time. Further, the through holes 2 are provided as round holes for joining in the vertical direction in a row at the mountain portions 1a at the upper and lower ends of the corrugated thin steel plate 1 for silos.

The round holes arranged in two rows in the vertical direction at intervals in the middle of the width direction of the corrugated thin steel plate 1 for silo are bolt holes for joining with the above-mentioned reinforcing columns. Bolt holes for joining with the reinforcing columns are not essential and may or may not be provided with the reinforcing columns. On the contrary, a bolt hole for joining with the stiffener provided to counter the horizontal force acting on the lower stage may be provided.

As shown in FIG. 4, the waveform shape of the silo corrugated thin steel plate 1 is a longitudinal wave waveform having a predetermined depth in which peaks 1a and valleys 1b are repeated at a predetermined pitch P1 along the vertical direction. .. In the illustrated form, 16 peaks 1a appear in the height H1 where the pitch P1 = 68 mm, but the wave depth D3 = 13 mm is illustrated. The mountain portion 1a and the valley portion 1b refer to a state seen from the inside of the wall body 11.

<Joined part>
Next, the joint portion between the corrugated thin steel plates 1 for silos will be described with reference to FIG. FIG. 5 is a vertical cross-sectional view showing a joint portion for bolting the corrugated thin steel plates 1 for silo to each other, and FIG. 5 (a) is a vertical cross-sectional view showing the joint portion in the vertical direction of the general portion. (B) is a vertical cross-sectional view showing a joint portion in which three or more end portions where the joint portion in the circumferential direction and the joint portion in the vertical direction overlap are overlapped.

As shown in FIG. 5A, the vertical joints of the general portion for bolt-joining the corrugated thin steel plates 1 for silos have their ends overlapped by a predetermined distance H2 (H2 = 19 mm in the illustrated embodiment). It is bolted through the through hole 2 provided in the mountain portion 1a. That is, as shown in FIG. 5A, the mountain bolt 3 for the corrugated plate is inserted from the inside of the wall body 11 with the nut 6 via the head side washer 4 and the nut side washer 5 with the bolt head 3a as the outside. It is internally tightened. At this time, bolts may be joined by interposing a bolt packing made of an elastic body such as a rubber material.

Further, although not shown, the joint portion in the circumferential direction in which the corrugated thin steel plates for silos 1 are bolted to each other is also bolted in the same manner. However, as described above, the through holes 2 of the joint portion in the circumferential direction are provided in two rows, and the valley portion 1b is also joined. When joining at the valley portion 1b, unlike the case shown in FIG. 5 (a), the valley bolt for the corrugated plate is provided with a nut via a head side washer and a nut side washer with the bolt head inside. It is externally tightened from the outside of the wall body 11. This is to prevent stress from concentrating on either one.

Then, as shown in FIG. 5B, in the portion where the silo corrugated thin steel plates 1 are bolted to each other, the joint portion where the circumferential joint portion and the vertical joint portion overlap is the silo corrugated thin steel plate 1. Three or more ends of the steel will be overlapped and joined.

For this reason, in the conventional corrugated steel sheet for silos made of a medium-sized steel plate having a plate thickness of 3 mm or more, since the medium-sized steel plates having substantially the same shape with high rigidity are combined with each other, a deviation is inevitable, and a general round hole bolt hole is used. , The positions of the holes did not match and it was not possible to join.

However, as described above, the corrugated thin steel plate 1 for silos according to the present embodiment is made of a thin plate (thin steel plate) having a thickness of less than 2.7 mm, and has a wave depth higher than that of a corrugated sheet which is a conventional corrugated steel plate. Is shallow, and the wave depth is D3 = 13 mm. For this reason, the corrugated thin steel sheet 1 for silos is more easily bent and twisted than the conventional corrugated sheet, and the handling performance at the time of assembly construction is remarkably improved. Therefore, the bolt holes can be assembled as round holes, the gaps penetrating the steel plate are eliminated, and the airtightness can be maintained as the grain silo 10.

In short, it is not necessary to weld the joint portions of the corrugated thin steel plates 1 for silos shown in FIGS. 5 (a) and 5 (b) to maintain airtightness. For this reason, none of the joint portions of the corrugated thin steel plates for silos 1 are welded together, including the joint portion in which three or more sheets are overlapped.

From the results of the assembly test described later, by using a corrugated steel plate made of a thin plate (thin steel plate) of less than 2.7 mm, it is easy to bend and twist, so it should be a long hole or a round hole with play. On the contrary, it turned out that it became difficult to assemble the silo. Therefore, the through hole 2 of the corrugated thin steel plate 1 for silo according to the present embodiment is a round hole with no play for adjusting the length. Therefore, according to the corrugated thin steel plate 1 for silos, the silo 10 for grains can be assembled with high accuracy.

Further, although the case where the corrugated thin steel plates 1 for silos are bolted to each other has been described as an example, the corrugated thin steel plates 1 for silos may be joined by other joining members such as rivets. Here, the joining member refers to a member such as a bolt or a rivet that is mechanically dry-joined.

According to the corrugated thin steel sheet 1 for silos and the silo 10 for grains in which they are combined according to the first embodiment described above, weight reduction can be achieved while maintaining the required strength and rigidity, and the silo can be manufactured at low cost. Can be done. Further, according to the corrugated thin steel plate 1 for silos and the silo 10 for grains, the airtightness required for the silo 10 for grains can be maintained. Further, according to the corrugated thin steel plate 1 for silo and the silo 10 for grain, the handling performance at the time of assembly construction can be improved, and the silo 10 for grain can be assembled accurately and in a short time.

[Second Embodiment]
Next, the corrugated thin steel sheet 1'for silos according to the second embodiment of the present invention will be described with reference to FIG. The difference between the silo corrugated thin steel plate 1 according to the second embodiment of the present invention and the silo corrugated thin steel plate 1 according to the first embodiment is that the through holes 2'provided at the four corners are elongated holes. It's just the point. Therefore, this point will be mainly described, and the same configurations are designated by the same reference numerals and the description thereof will be omitted.

6A and 6B are views showing a corrugated thin steel sheet 1'for a silo according to a second embodiment of the present invention, FIG. 6A is a front view of the corrugated thin steel sheet 1'for a silo, and FIG. 6B is a front view. , The plan view, FIG. 6 (c) is an enlarged front view of part B showing the vicinity of the through holes 2'at the four corners. As shown in FIG. 6, the corrugated thin steel sheet 1'for silos has elongated holes 2'provided at the four corners. In addition, other configurations are the same as those of the corrugated thin steel plate 1 for silos described above.

Therefore, according to the corrugated thin steel sheet 1'for silos according to the second embodiment, it is possible to avoid a situation in which assembly is not possible even in a joint portion where three or more end portions are overlapped and joined. On the other hand, by making the holes long, there is a possibility that a gap penetrating the steel plate is formed between the long holes and the bolts. However, if only the through holes 2'provided at the four corners are used, it is possible to secure airtightness by using a large bolt packing or by applying a seal to the gap to take a separate moisture-proof measure.

The corrugated thin steel sheets 1, 1'for silos and the grain silo 10 in combination thereof according to the first and second embodiments of the present invention have been described in detail above, but the above-described or illustrated embodiment has been described in detail. All of them merely show one embodiment embodied in carrying out the present invention. Therefore, the technical scope of the present invention should not be construed in a limited manner by these.

<Assembly test>
Next, in the corrugated thin steel sheet for silos according to the present invention, an assembly test conducted to clarify the relationship between the plate thickness t and the diameter of the round hole will be described. In the assembly test, whether or not the wall body of the silo can be actually assembled and assembled by gradually changing the thickness of the steel plate in the 2-shaped corrugated shape of the JIS G 3470 corrugated section as a generally available steel plate. , Considered from the viewpoint of whether the assembly accuracy is low or high.

The assembly test was performed with two types of bolts, M10 bolt and M16 bolt. The results are the results when Table 1 is M10 and Table 2 is M16. Table 3 summarizes the results of the two tests. In the table, ×: cannot be assembled, 〇: can be assembled + high assembly accuracy, Δ: can be assembled + low assembly accuracy, XX: can be assembled but the assembly accuracy is low, and it is judged that the finished product is unsuccessful.

As is clear from Table 1, when using M10 bolts, it can be assembled if the plate thickness t is within the range of 0.27 mm or more and 1.20 mm or less and the diameter of the round hole, which is the same as the nominal diameter, is 10 mm. There wasn't. However, when the diameter of the round hole is 11 mm to 14 mm, it can be assembled and the assembly accuracy is good. When the diameter of the round hole is 15 mm to 19 mm, it can be assembled, but the assembly accuracy is low. When the diameter of the round hole is 20 mm or more, it can be assembled, but the assembly accuracy is extremely low, and it is judged that the finished product is unsuccessful.

Further, when the plate thickness t was in the range of more than 1.20 mm and within 2.00 mm, when the diameter of the round hole was 10 mm to 11 mm, it could not be assembled. However, when the diameter of the round hole is 12 mm to 16 mm, it can be assembled and the assembly accuracy is good. When the diameter of the round hole is 17 mm to 19 mm, it can be assembled, but the assembly accuracy is low. When the diameter of the round hole is 20 mm or more, it can be assembled, but the assembly accuracy is extremely low, and it is judged that the finished product is unsuccessful.

When the plate thickness t was more than 2.00 mm and less than 2.70 mm, and the diameter of the round hole was 10 mm to 12 mm, it could not be assembled. However, when the diameter of the round hole is 13 mm to 17 mm, it can be assembled and the assembly accuracy is good. When the diameter of the round hole is 18 mm to 19 mm, it can be assembled, but the assembly accuracy is low. When the diameter of the round hole is 20 mm or more, it can be assembled, but the assembly accuracy is extremely low, and it is judged that the finished product is unsuccessful.

As is clear from Table 2, when using M16 bolts, it can be assembled if the plate thickness t is within the range of 0.27 mm or more and 1.20 mm or less and the diameter of the round hole, which is the same as the nominal diameter, is 16 mm. There wasn't. However, when the diameter of the round hole is 17 mm to 20 mm, it can be assembled and the assembly accuracy is good. When the diameter of the round hole is 21 mm to 25 mm, it can be assembled, but the assembly accuracy is low. If the diameter of the round hole is 26 mm or more, it can be assembled, but the assembly accuracy is extremely low, and it is judged that the finished product is unsuccessful.

Further, when the plate thickness t was in the range of more than 1.20 mm and within 2.00 mm, when the diameter of the round hole was 16 mm to 17 mm, it could not be assembled. However, when the diameter of the round hole is 18 mm to 22 mm, it can be assembled and the assembly accuracy is good. When the diameter of the round hole is 23 mm to 25 mm, it can be assembled, but the assembly accuracy is low. If the diameter of the round hole is 26 mm or more, it can be assembled, but the assembly accuracy is extremely low, and it is judged that the finished product is unsuccessful.

When the plate thickness t was more than 2.00 mm and less than 2.70 mm, and the diameter of the round hole was 16 mm to 18 mm, it could not be assembled. However, when the diameter of the round hole is 19 mm to 23 mm, it can be assembled and the assembly accuracy is good. When the diameter of the round hole is 24 mm to 25 mm, it can be assembled, but the assembly accuracy is low. If the diameter of the round hole is 26 mm or more, it can be assembled, but the assembly accuracy is extremely low, and it is judged that the finished product is unsuccessful.

The assembly test was also performed on the 1-type wave shape of the JIS G 3470 corrugated section, but the results were similar to the 2-type wave shape. From this, it was judged that when the corrugated thin steel plate was used, the plate thickness had more influence on the assembly accuracy than the difference in wave shape.

To summarize these, in the assembly test, when the plate thickness t is 0.27 mm or more and 1.20 mm or less, the diameter of the round hole is equal to or more than the value obtained by adding 1 mm to the bolt diameter and less than or equal to the value obtained by adding 4 mm to the bolt diameter. When it becomes. When the plate thickness t is more than 1.20 mm and less than 2.00 mm, the diameter of the round hole is equal to or more than the value obtained by adding 2 mm to the bolt diameter and not more than the value obtained by adding 6 mm to the bolt diameter. When the plate thickness t is more than 2.00 mm and less than 2.70 mm, the waveform is thin when the diameter of the round hole is equal to or more than the value obtained by adding 3 mm to the bolt diameter and equal to or less than the value obtained by adding 7 mm to the bolt diameter. It can be concluded that the cylindrical wall body can be easily assembled from the steel plate and the assembly accuracy is also good.

1,1': Corrugated thin steel plate for silo 1a: Mountain part 1b: Valley part 2: Through hole (round hole)
2': Through holes (long holes) at the four corners
3: Mountain bolt (joining member)
3a: Bolt head (joining member)
4: Head side washer (joining member)
5: Nut side washer (joining member)
6: Nut (joining member)
10: Silo for grain 11: Wall body 12: Roof 12a: Opening θ1: Roof slope

Claims (5)

It is formed from a corrugated steel plate having a through hole into a cylindrical curved body having an arc shape in a plan view, and is joined in the circumferential direction and the vertical direction by a joining member such as a bolt or a rivet inserted through the through hole, and has three ends. A corrugated steel plate for a silo for constructing a silo having a joint portion overlapped as described above and having a cylindrical or semi-cylindrical wall portion.
The through hole is a round hole having no play for adjusting the length, and is a corrugated thin steel plate for silos, which is made of a thin steel plate having a plate thickness of less than 2.7 mm. It is formed from a corrugated steel plate having a through hole into a cylindrical curved body having an arc shape in a plan view, and is joined in the circumferential direction and the vertical direction by a joining member such as a bolt or a rivet inserted through the through hole, and has three ends. A corrugated steel plate for a silo for constructing a silo having a joint portion overlapped as described above and having a cylindrical or semi-cylindrical wall portion.
The through hole is a round hole having no play for adjusting the length except for the through holes formed at the four corners, and is made of a thin steel plate having a plate thickness of less than 2.7 mm. Thin steel plate. The joining members are bolts and nuts.
When the plate thickness is 0.27 mm or more and 1.20 mm or less, the diameter of the round hole is equal to or more than the value obtained by adding 1 mm to the diameter of the bolt and not more than the value obtained by adding 4 mm to the diameter of the bolt.
When the plate thickness is more than 1.20 mm and within 2.00 mm, the diameter of the round hole is equal to or more than the value obtained by adding 2 mm to the diameter of the bolt and not more than the value obtained by adding 6 mm to the diameter of the bolt.
When the plate thickness is more than 2.00 mm and less than 2.70 mm, the diameter of the round hole is equal to or more than the value obtained by adding 3 mm to the diameter of the bolt and not more than the value obtained by adding 7 mm to the diameter of the bolt. The corrugated thin steel plate for silos according to claim 1 or 2. A grain silo for storing grains such as rice, wheat, corn, and soybeans.
The corrugated thin steel sheet for silos according to any one of claims 1 to 3 has a joint portion in which three or more sheets are overlapped, and is combined and joined in the circumferential direction and the vertical direction. Grain silo. The grain silo according to claim 4, wherein the three or more laminated joint portions are not welded.

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