JP2018031244A - Method of constructing silo hopper part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of constructing a silo hopper part that enables early construction.SOLUTION: The present invention relates to a method of constructing a silo hopper part comprising a hopper skeleton 2 formed across a payoff space 3, a housing 6 for a payoff device formed above the payout space 3; and a beam 5 laid horizontally on the hopper skeleton 2, the method comprising: a partition wall forming process of forming a partition wall 9 of the hopper skeleton 2 by combining a plurality of precast wall members 90; a side wall part forming process of forming a side wall part 81 of the hopper skeleton 2; a first inclined wall part forming process of forming a lower inclined wall part 72 of the hopper skeleton 2 on the side wall part 81; a beam upper mounting process of mounting beam steel on the partition wall 9; a housing forming process of laying the housing 6; a second inclined wall part forming process of forming an upper inclined wall part 72 of the hopper skeleton 2 on a lower inclined wall part 71, and also forming a beam 5 by casing concrete to a periphery of the beam steel 51; and a top part forming process of forming a top part 73 of the hopper skeleton 2 on the upper inclined wall part 72.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for constructing a silo hopper.

In silos of coal, aggregate, grain, etc., it is common to guide the contents (coal, etc.) into the payout space formed at the bottom and convey the contents by a belt conveyor arranged in the payout space. It is. The contents are guided to the payout space by using a payout device disposed in the silo hopper at a silo hopper formed immediately above the payout space at the bottom of the silo.
The silo hopper is formed by a hopper housing formed so as to sandwich the payout space. The hopper housing generally includes an upper housing that forms an inclined surface of the silo hopper portion, and a lower housing that supports the upper housing and forms the side wall of the payout space.
In the silo hopper, a housing for accommodating the dispensing device is formed along the upper portion of the dispensing space. The housing is suspended by a beam laid across the top of the hopper housing.

The hopper housing, housing and beam are generally formed from cast concrete. However, construction using cast-in-place concrete required reinforcement work, formwork assembly and removal work, concrete curing, etc., which hindered shortening the work period.
In the construction method disclosed in Patent Document 1, the construction period is shortened by constructing the upper housing of the hopper housing with a precast member. The upper housing is supported by a partition wall formed so as to be orthogonal to the axial direction of the hopper housing. In the construction method disclosed in Patent Document 1, after the upper frame is mounted on the partition wall, the lower frame is formed of cast-in-place concrete.

Japanese Patent Laid-Open No. 08-135244

Since the partition wall functioning as a support member for the hopper housing needs to have sufficient proof strength against the loading load, the amount of bar arrangement increases. Therefore, when a precast member is adopted, since the weight of one piece is increased, it takes time for transportation and construction.
On the other hand, with the suspension of use of nuclear power plants due to the Great East Japan Earthquake, much of the power is supplied by thermal power generation. Some of the fuel silos used in thermal power generation (coal silos) are aging, and large-scale silos are required to increase power generation. For early silos, further early construction is required.
From such a viewpoint, an object of the present invention is to propose a method for constructing a silo hopper capable of early construction.

  In order to solve the above-described problems, the present invention provides a hopper housing formed so as to sandwich a dispensing space, a housing for a dispensing device formed above the dispensing space, and a beam horizontally mounted on the hopper housing. The construction method of the silo hopper part provided with these. The silo hopper portion construction method includes a partition wall forming step of forming a partition wall of the hopper housing by combining a plurality of precast wall members, a side wall portion forming step of forming the sidewall portion of the hopper housing, A first diagonal wall portion forming step of forming a lower diagonal wall portion of the hopper housing on the side wall portion, a beam mounting step of mounting a beam steel frame on the partition wall, a housing forming step of laying the housing; A second diagonal wall portion forming step of forming the upper diagonal wall portion of the hopper housing on the lower diagonal wall portion and placing concrete around the beam steel frame to form the beam; and the upper diagonal wall And a top forming step of forming the top of the hopper housing on the part.

  According to this silo hopper construction method, the partition wall constituting the hopper housing is constructed by the precast member, so that the construction period can be shortened. Since the partition wall is divided into a plurality of precast wall members, it is easy to handle. Note that a slit may be formed in the partition wall, or an opening may be formed.

In the first diagonal wall portion forming step, an operation of laying a first precast concrete plate between partition walls formed at intervals with respect to the axial direction of the hopper housing (extension direction of the payout space); What is necessary is just to form a lower diagonal wall part by the operation | work which arrange | positions a metal plate with a clearance gap from said 1st precast concrete plate, and the operation | work which places concrete between said 1st precast concrete plate and said metal plate. . By adopting a so-called half PC member using the first precast concrete plate as the lower oblique wall, the construction period can be shortened.
Further, in the side wall portion forming step, an operation of arranging a mold on each of the front surface and the back surface of the side wall portion, and an operation of arranging a second precast concrete plate so as to project from the upper portion of the side wall portion to the payout space side. And the side wall portion may be formed by placing concrete in a space surrounded by the mold and the second precast concrete plate. When a so-called half PC member is used for the protruding portion, the construction period can be shortened.

  According to the construction method of the silo hopper portion of the present invention, early construction of the silo is possible.

It is an elevational view showing a coal storage facility according to an embodiment of the present invention. It is sectional drawing which shows a coal silo. It is a figure which shows a silo hopper part, Comprising: (a) is AA sectional drawing of FIG. 2, (b) is the BB sectional drawing. It is an expanded sectional view showing a part of silo hopper part. It is a perspective view which shows the construction procedure of the construction method of the silo hopper part of this embodiment, (a) is a partition wall formation process, (b) is a side wall part formation process. (A) is sectional drawing which shows the formwork arrangement | positioning operation | work of a side wall part formation process, (b) is the same top view. It is a perspective view which shows the construction procedure of the construction method of the silo hopper part which continues FIG. 5, Comprising: (a) is PCa board erection work for the upper frame of a 1st diagonal wall part formation process, (b) is the metal plate arrangement | positioning work. is there. It is a perspective view which shows the construction procedure of the construction method of the silo hopper part following FIG. 7, (a) is a 1st diagonal wall part formation process, (b) is a beam mounting process. It is sectional drawing of a beam mounting process. It is a perspective view of a housing formation process. (A) is a perspective view of the housing formation process following FIG. 10, (b) is a perspective view of the metal plate installation work of a 2nd diagonal wall part formation process. (A) is a perspective view which shows the 2nd diagonal wall part formation process following FIG.11 (b), (b) is a perspective view which shows a top part formation process.

In this embodiment, a case where a coal storage facility is constructed will be described. As shown in FIG. 1, the coal storage facility of the present embodiment includes a plurality of coal storage silos (hereinafter simply referred to as “coal silo 1”). In addition, the number, arrangement | positioning, etc. of the coal silo 1 are not limited, What is necessary is just to set suitably. For example, it is not always necessary to construct a plurality of coal silos 1.
As shown in FIG. 2, the coal silo 1 of the present embodiment includes a foundation slab 11, a silo body 12 erected on the foundation slab 11, and a roof portion 13 formed at the upper end of the silo body 12. ing.

The foundation slab 11 is a bottom slab made of reinforced concrete. The thickness (height) of the foundation slab 11 is not limited and may be determined as appropriate.
The silo body 12 is formed in a cylindrical shape. Note that the shape of the silo body 12 is not limited, and may be, for example, a rectangular tube shape. A silo hopper portion 2 is formed inside the silo body 12. An inner wall 14 is formed along the inner peripheral surface of the lower part of the silo body 12. The inner wall 14 has a truncated cone shape whose diameter is reduced toward the lower side.
As shown in FIG. 1, the roof portion 13 has a truncated cone shape whose diameter decreases toward the upper end. In addition, the shape of the roof part 13 is not limited.

  The silo hopper unit 2 guides the coal, which is the contents of the coal silo 1, to the discharge space 3 and discharges the coal to the outside of the coal silo 1. As shown in FIG. 3B, the silo hopper portion 2 of the present embodiment is provided with three rows of payout spaces 3, 3, and 3 in parallel. The payout space 3 is a space formed in a straight line. The end of the payout space 3 faces the outer surface of the coal silo 1. The payout space 3 has a cross-sectional shape in which transportation means (not shown) such as a belt conveyor can be disposed (see FIG. 2).

As shown in FIGS. 2 and 3A, the silo hopper unit 2 includes a hopper housing 4, a beam 5, and a housing 6.
The hopper housing 4 is formed in parallel with the payout space 3. In the present embodiment, the first hopper housings 41 and 41 formed between the payout spaces 3 and the second hopper housing 42 formed between the outer wall of the silo body 12 and the payout space 3 are provided. . In the present embodiment, two rows of first hopper housings 41 and 41 are formed, but the number of first hopper housings 41 is not limited and may be appropriately formed according to the number of payout spaces 3. That's fine.

  The hopper housing 4 (the first hopper housing 41 and the second hopper housing 42) includes an upper housing 7 that forms the inclined surface of the silo hopper portion 2, and a lower housing 8 that supports the upper housing 7 and forms the side wall of the dispensing space 3. And the partition wall 9 which supports the upper housing | casing 7 and the lower housing 8 from the back surface (surface on the opposite side to the payout space 3) is provided (refer FIG. 4).

  As shown in FIG. 4, the upper casing 7 of the present embodiment includes a lower diagonal wall portion 71 and an upper diagonal wall portion 72. The upper casing 7 of the first hopper casing 41 includes a top portion 73 formed at the upper end of the upper oblique wall portion 72. On the other hand, the upper end of the upper diagonal wall portion 72 of the second hopper housing 42 is connected to the lower end of the inner wall 14. The configuration of the upper housing 7 is not limited and may be determined as appropriate. The lower diagonal wall portion 71 extends obliquely upward from the upper end of the lower housing 8 and is inclined so as to be separated from the dispensing space 3 as it goes upward. The upper diagonal wall portion 72 extends obliquely upward from the upper end of the lower diagonal wall portion 71. Moreover, the lower diagonal wall part 71 and the upper diagonal wall part 72 which continue up and down incline at the same angle. Similarly, the inner wall 14 and the upper oblique wall portion 72 that are vertically continuous, and the upper oblique wall portion 72 and the top portion 73 are also inclined at the same angle.

  The lower housing 8 includes a side wall portion 81 and an overhang portion 82 formed on the upper portion of the side wall portion 81 and has an inverted L shape in cross section. The side wall portion 81 is continuous along the side surface of the payout space 3 (see FIG. 3A). The overhang part 82 projects from the upper part of the side wall part 81 toward the upper side of the payout space 3. A gap for guiding coal (contents) to the dispensing space 3 is formed between the overhanging portions 82 of the lower casings 8 adjacent to each other with the dispensing space 3 interposed therebetween. In addition, although the magnitude | size of the clearance gap between the overhang | projection parts 82 is not limited, In this embodiment, it shall be about 700 mm.

  The partition wall 9 is formed so as to intersect with the axial direction of the hopper housing 4 (longitudinal direction of the payout space 3), and a plurality of partition walls 9 are formed at intervals with respect to the axial direction of the hopper housing 4. In this embodiment, the 1st partition wall 91 is formed in the position of each beam 5, and the 2nd partition wall 92 is formed in the intermediate position of adjacent beams 5 (refer Fig.5 (a)). In addition, the formation location of the partition wall 9 is not limited, What is necessary is just to determine suitably. The partition wall 9 is formed by combining a plurality of wall members 90, 90,. An opening 93 is formed at the center of the partition wall 9. Note that the opening 93 of the partition wall 9 is not necessarily formed. That is, the inside of the hopper housing 4 may be completely shielded by the partition wall 9. Moreover, the shape of each partition wall 9 (the 1st partition wall 91 and the 2nd partition wall 92) is not limited.

  As shown in FIGS. 3A and 4, the beam 5 is orthogonal to the payout space 3 and the hopper housing 4. Both ends of the beam 5 are connected to the inner surface of the outer wall of the silo body 12. In the present embodiment, a plurality of beams 5, 5,. That is, the silo hopper portion 2 of the present embodiment has a lattice shape in plan view due to the hopper housing 4 and the beam 5. The beam 5 of this embodiment consists of a steel frame reinforced concrete structure. In addition, the structure of the beam 5 is not limited, For example, a reinforced concrete structure may be sufficient. Moreover, the beam 5 should just cross | intersect the hopper housing | casing 4, and does not necessarily need to orthogonally cross.

  The housing 6 is formed in parallel with the payout space 3 immediately above the payout space 3. The housing 6 includes a housing main body 61 formed in a gate shape and a support portion 62 formed integrally with the upper portion of the housing main body 61. The housing main body 61 is a concrete member having a cross-sectional view and has a lower end opened. The inside of the housing main body 61 can store the dispensing device. The support part 62 is a beam member made of steel reinforced concrete formed so as to intersect the beam 5. That is, both ends of the support portion 62 are connected to the side surfaces of the adjacent beams 5 and 5. In addition, the structure of the support part 62 is not limited, For example, the product made from a reinforced concrete may be sufficient.

A silo hopper construction method includes a partition wall forming step, a side wall portion forming step, a first oblique wall portion forming step, a beam mounting step, a housing forming step, a second oblique wall portion forming step, and a top portion forming step. And.
A partition wall formation process is a process of forming the partition wall 9, as shown to Fig.5 (a). The partition wall 9 is formed by combining a plurality of precast wall members 90, 90. The partition wall 9 is formed at an interval with respect to the axial direction of the hopper housing 4. In the present embodiment, the first partition wall 91 is formed according to the position of the beam 5, and the second partition wall 92 is formed between the adjacent first partition walls 91.

The first partition wall 91 includes a pair of wall members 90, 90 arranged with a space (opening 93) therebetween, and a first upper wall member 94 mounted horizontally on the upper ends of both wall members 90, 90. Form. That is, the first partition wall 91 has a gate shape. The upper end of the wall member 90 has a flat surface. The wall member 90 has sufficient strength as a support member for the beam 5. The wall member 90 includes a rectangular portion formed along the back surface of the lower housing 8, and a trapezoidal portion formed on the upper side of the upper shape portion and having a lower inclined portion at the same angle as the inclined surface of the upper housing 7. It has. The shape of the wall member 90 is not limited. The first upper wall member 94 is a trapezoidal member with a lower side having a larger width than the upper side. The first upper wall member 94 may be disposed as necessary.
The second partition wall 92 is formed by arranging a pair of wall members 90, 90 with an interval (opening 93) therebetween, and horizontally placing a second upper wall member 95 on the upper ends of both wall members 90, 90. Form. That is, the second partition wall 92 has a portal shape. The second upper wall member 95 is a member having a trapezoidal shape in front view, the lower side having a larger width than the upper side and the height being higher than that of the first upper member 94. The second upper wall member 95 may be disposed as necessary. In addition, the shape dimension of the wall member 90 which comprises the 2nd partition wall 92 may be the same as that of the wall member 90 which comprises the 1st partition wall 91, and may differ. Further, the first upper wall member 94 and the second upper wall member 95 do not necessarily have a trapezoidal shape when viewed from the front, and the shapes thereof are not limited.

The side wall portion forming step is a step of forming the lower casing 8 of the hopper casing 4 (see FIG. 5B). The side wall part formation process of this embodiment is provided with a formwork arrangement | positioning work, the overhanging part PCa board construction work, and the concrete placement work.
In the mold layout operation, as shown in FIG. 6A, the first mold 83 is installed so as to be flush with the end surface of the wall member 90, and a second gap is provided from the first mold 83. A mold 84 is provided. That is, the first mold 83 and the second mold 84 are respectively installed at positions corresponding to the back surface (surface opposite to the payout space 3) and the front surface (surface on the payout space 3 side) of the side wall portion 81. In addition, the 2nd formwork 84 is arrange | positioned between the partition walls 9 adjacent to the axial direction of the hopper housing | casing 4 as shown in FIG.6 (b). Further, along with the installation of the molds 83 and 84, necessary reinforcing bars (not shown) are arranged.

In the overhanging portion PCa plate laying operation, the precast concrete plate 85 for the overhanging portion 82 is disposed so as to overhang from the upper portion of the side wall portion 81 toward the payout space 3 side. The precast concrete plate 85 is a half precast member that constitutes a part of the overhanging portion 82 of the lower housing 8 and covers the lower surface and the tip of the overhanging portion 82. In the present embodiment, the precast concrete plate 85 is supported by the support 86.
In the concrete placing work, concrete is placed in a space surrounded by the molds 83 and 84 and the precast concrete plate 85. Thereby, as shown in FIG.5 (b), the lower housing 8 with which the side wall part 81 and the overhang | projection part 82 were united is formed. After the concrete is cured, the molds 83 and 84 are removed.

The first diagonal wall portion forming step is a step of forming the lower diagonal wall portion 71 on the side wall portion 81 (see FIG. 8A).
The first oblique wall forming step of the present embodiment includes an upper frame PCa plate laying operation, a metal plate arranging operation, and a concrete placing operation.
In the upper frame PCa plate laying operation, as shown in FIG. 7A, a precast concrete plate 74 for the upper frame 7 is laid between the partition walls 9. The precast concrete plate 74 is a half precast member that constitutes a part of the lower diagonal wall portion 71 and the upper diagonal wall portion 72 of the upper casing 7. The precast concrete board 74 has a reverse V-shape when viewed from the front. The axial end of the hopper housing 4 of the precast concrete plate 74 is placed on the upper end of the adjacent partition wall 9. That is, the precast concrete board 74 is horizontally mounted on the partition walls 9 and 9 adjacent to each other in the axial direction of the hopper housing 4. The lower end of the precast concrete plate 74 is placed on the upper surface of the lower housing 8.

In the metal plate placement operation, the first metal plate 75 is placed as shown in FIG. The first metal plate 75 is disposed with a gap from the precast concrete plate 74 so as to be parallel to the precast concrete plate 74. The first metal plate 75 has a shape that covers the surface of the lower oblique wall 71. The first metal plate 75 is formed by connecting a plurality of plate materials. Prior to the installation of the first metal plate 75, a reinforcing bar (not shown) necessary for the lower oblique wall portion 71 is arranged.
In the concrete placing operation, concrete is placed between the precast concrete plate 74 and the first metal plate 75. As a result, as shown in FIG. 8A, a lower oblique wall portion 71 in which the precast concrete plate 74, the first metal plate 75, and the concrete are integrated is formed.

  The beam mounting step is a step of laying the beam steel frame 51 as shown in FIG. As shown in FIG. 9, the beam steel frame 51 is mounted on the first partition wall 91 (see FIG. 5). In the present embodiment, a plurality of beam steel frames 51 connected in a straight line are horizontally placed in the silo body 12. A height adjusting spacer 53 is interposed between the first partition wall 91 and the beam steel frame 51 as necessary. In addition, the connection method of the beam steel frames 51 is not limited. For example, a bolt that penetrates both the gusset plates and the beam steel frame 51 in a state where the flange or web of the beam steel frame 51 is sandwiched between a pair of gusset plates (not shown) disposed across the adjacent beam steel frames 51, 51. It can be fastened by.

A concrete precast portion 52 is partially formed on the beam steel frame 51. The precast portion 52 is formed in a portion excluding the joint portion between the beam steel frames 51 and the mounting portion on the first partition wall 91. Further, the connecting member 54 of the housing 6 is formed integrally with the beam steel frame 51.
In this embodiment, along with the construction of the beam steel frame 51, reinforcing bars (not shown) are arranged around the beam steel frame 51. A formwork (not shown) is disposed along the lower surface of the beam steel frame 51. In addition, the reinforcing bar arrangement pitch, the reinforcing bar diameter, and the like are not limited, and may be appropriately determined.

The housing forming step is a step of laying the housing 6. First, as shown in FIG. 10, the support portion 62 is fixed to the connection member 54 of the beam steel frame 51. At this time, the housing 6 (the support portion 62 or the housing main body 61) is supported from below (the basic slab 11) by a support work (not shown). A precast portion 63 of the housing body 61 is fixed to the support portion 62 in advance. The precast part 63 is formed intermittently so as not to contact the beam steel frame 51.
Next, as shown in FIG. 11 (a), the remaining portion of the housing body 61 (the spot hitting portion 64) is formed. In the construction of the spot casting portion 64, a reinforcing bar (not shown) is arranged around the beam steel frame 51, and a mold (not shown) is installed around the reinforcing bar, and the concrete is placed in the mold. This is done by placing The spot casting portion 64 is formed in a state where a part of the precast portion 52 formed on the beam steel frame 51 is rolled up.

The second diagonal wall portion forming step is a step of forming the upper diagonal wall portion 72 on the lower diagonal wall portion 71 (see FIG. 12A). The second oblique wall forming step includes a bar arrangement work, a metal plate installation work, and a concrete placing work.
In the bar arrangement work, reinforcing bars (not shown) necessary for the upper diagonal wall portion 72 are arranged along the surface of the precast concrete plate 74.

In the metal plate installation work, as shown in FIG. 11B, the second metal plate 77 is installed with a gap from the precast concrete plate 74 so as to be parallel to the precast concrete plate 74. In this embodiment, with the installation of the second metal plate 77, a mold (not shown) is installed around the beam steel frame 51. The formwork is installed on the spot-fired portion (portion other than the precast portion 52) 54 of the beam 5 (see FIG. 12A). A housing metal plate 65 parallel to the second metal plate 77 is also installed on the support portion 62 of the housing 6.
In the concrete placing work, concrete is placed between the precast concrete plate 74 and the second metal plate 77, the space surrounded by the housing main body 61 and the housing metal plates 65, 65, and around the beam 5 (in the formwork). To cast. Thereby, as shown to Fig.12 (a), the upper diagonal wall part 72, the housing 6, and the beam 5 are integrally formed.

The top forming step is a step of forming tops 73, 66, and 55 at the upper end of the hopper housing 4, the upper end of the housing 6, and the upper end of the beam 5 as shown in FIG.
The top portions 73, 66, and 55 are formed by fixing a top precast member having a triangular shape in cross section to the upper end of the upper oblique wall portion 72, the upper end of the support portion 62, and the upper end of the beam 5. A metal plate is fixed to the surface of the top precast member.

According to the construction method of the silo hopper portion of the present embodiment, the construction period can be shortened by constructing the partition wall 9 constituting the hopper housing 4 with the precast member. Since the wall member which comprises the partition wall 9 is divided | segmented into plurality, it is easy to handle.
Moreover, since what is called a half PC member using the precast concrete board 74 is employ | adopted as the upper housing 7, a construction period can be shortened.
Since a so-called half PC member (precast concrete plate 85) is employed for the overhanging portion 82, the construction period can be shortened.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the above-described constituent elements can be appropriately changed without departing from the spirit of the present invention.
Although the said embodiment demonstrated the silo for coal storage, the kind of content accommodated in a silo is not limited to coal. For example, aggregates used for concrete or asphalt, powder such as cement, grains, and the like may be used.
In the above-described embodiment, the case where the lower diagonal wall portion 71 and the upper diagonal wall portion 72 are respectively formed as the harp precast member has been described. However, the lower diagonal wall portion 71 and the upper diagonal wall portion 72 may be full precast members. .
Further, the upper housing 7 does not necessarily need to be divided into the lower oblique wall portion 71, the upper oblique wall portion 72 and the top portion 73. The upper casing 7 may integrally form the wall 71, the upper oblique wall 72, and the top 73, or may integrally form the wall 71 and the upper oblique wall 72 or the upper oblique wall 72 and the top 73. May be.
Similarly, the lower housing 8 may be formed of a full precast member.

DESCRIPTION OF SYMBOLS 1 Coal silo 2 Silo hopper part 3 Discharge space 4 Hopper housing 5 Beam 6 Housing 7 Upper housing 71 Lower diagonal wall part 72 Upper diagonal wall part 73 Top part 74 Precast concrete board (1st precast concrete board)
75 First metal plate (metal plate)
8 Lower frame 81 Side wall part 82 Overhang part 83,84 Formwork 85 Precast concrete board (second precast concrete board)
9 Partition wall 90 Wall member

Claims (3)

A method for constructing a silo hopper unit comprising: a hopper housing formed so as to sandwich a dispensing space; a housing for a dispensing device formed above the dispensing space; and a beam horizontally mounted on the hopper housing. ,
A partition wall forming step of forming a partition wall of the hopper housing by combining a plurality of precast wall members;
A side wall forming step for forming a side wall of the hopper housing;
A first diagonal wall forming step of forming a lower diagonal wall of the hopper housing on the side wall;
A beam mounting step of mounting a beam steel frame on the partition wall;
A housing forming step of constructing the housing;
Forming the upper diagonal wall portion of the hopper housing on the lower diagonal wall portion, and placing the concrete around the beam steel frame to form the beam;
And a top forming step of forming a top of the hopper housing on the upper oblique wall. A method for constructing a silo hopper. The first diagonal wall forming step includes
The work of laying the first precast concrete plate between the partition walls formed at an interval with respect to the axial direction of the hopper housing,
Work to arrange a metal plate with a gap from the first precast concrete plate,
The construction method of the silo hopper part of Claim 1 provided with the operation | work which casts concrete between said 1st precast concrete board and said metal plate. The side wall portion forming step includes
Work to arrange the molds on the front and back surfaces of the side wall part,
An operation of arranging the second precast concrete plate so as to project from the upper part of the side wall portion to the payout space side;
The construction method of the silo hopper part of Claim 1 or Claim 2 provided with the operation | work which casts concrete in the space enclosed by the said formwork and said 2nd precast concrete board.

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