JP2018044318A - Silo roof construction method and silo roof structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a method for constructing a silo roof portion and a silo roof structure capable of constructing a silo roof portion easily and inexpensively. SOLUTION: A roof assembly step of assembling at least a part of a roof steel frame 2 inside a tubular silo main body 12 to form a base steel frame body, and a roof for suspending the base steel frame body at an upper end portion of the silo main body 12. A method for constructing a silo roof portion including a lifting step and a roof fixing step of fixing the end portion of the steel frame body to the steel frame bracket 4 formed at the upper end portion of the silo main body 12, wherein the steel frame bracket 4 is The upper end of the silo main body 12 projects to the inner air side, and in the roof lifting step, the steel frame body is lifted by the lifting means provided on the steel frame bracket 4. [Selection diagram] Fig. 1

Description

  The present invention relates to a silo roof construction method and a silo roof structure.

When building silos of coal, aggregate, grain, etc., the cylindrical main body (cylindrical wall) is formed by the sliding foam method or jumping foam method, and then the frustum-shaped roof at the upper end of the main body Is generally formed. Since the top of the cylindrical wall is usually provided at the upper end of the main body so as to harden the top of the cylindrical wall, that portion is thicker than the wall thickness of the main body. For this reason, it is necessary to prepare a formwork and a scaffold separately only in the top part, and it becomes one factor which hinders construction period shortening.
When the roof portion is formed at the upper end of the main body portion, it is necessary to provide a temporary member such as a temporary supporting work or a temporary scaffold for supporting the roof portion. However, it takes time and money to install and remove temporary scaffolds. In addition, the construction of the roof requires the installation of multiple large cranes to transport the material and support the roof under construction, which is expensive and ensures sufficient space for the crane. There was a need to do.

  Therefore, after forming a roof part in the bottom part in the inner space of a cylindrical main body part, the construction method which lifts a roof part with the jack provided in the upper end part of a main part may be adopted (for example, patent documents). 1). The jack is installed on a temporary mount formed so as to protrude into the inner space of the main body.

JP-A-2015-113609

The temporary mount for installing the jack has sufficient strength with respect to the weight of the roof, and has sufficient strength against the construction load that occurs when the roof is lifted. Must be fixed. Installation and removal of such a temporary mount requires time and money.
From such a viewpoint, it is an object of the present invention to propose a silo roof part construction method and a silo roof structure capable of rationally constructing a silo roof part for the purpose of shortening the construction period and cost. To do.

In order to solve the above problems, a silo roof construction method according to the present invention includes a roof assembling step of assembling at least a part of a roof steel frame inside a cylindrical main body to form a ground steel frame, A roof lifting step of lifting the ground steel frame to the upper end of the main body, and a roof fixing step of fixing an end of the ground steel frame to a steel bracket formed on the upper end of the main body The steel bracket projects to the inner space side at the upper end of the main body, and in the roof lifting step, the ground steel frame body is lifted by a lifting means provided on the steel bracket. It is a feature.
According to the construction method of the silo roof part, since the steel bracket as a permanent member is used as a platform for the lifting means, the labor and cost of the construction are reduced as compared with the conventional construction method in which a temporary platform is separately provided. Can be achieved.

An extending member is fixed to the tip of the steel bracket, and the lifting means is provided via a base mounted on the upper surface of the main body, the upper surface of the steel bracket, and the upper surface of the extending member. In addition, it is desirable that the extending member is formed with a recess that can be inserted through the end of the ground steel frame.
According to such a silo roof construction method, a space necessary for placing the lifting means can be secured at the upper end of the main body. In addition, the extension member has a recess that allows the end of the roof steel frame to be inserted, so there is no need to extend the lifting means more than necessary, and as a result, the scale of the lifting means must be scaled. Can be minimized.
In the roof fixing step, it is desirable to fix the end portion of the ground steel frame suspended from the leg portion fixed in advance to the upper surface of the steel frame bracket.

  Moreover, the silo roof structure of the present invention is characterized by including a steel frame fixed to the inner wall surface of the cylindrical main body and a roof steel frame mounted on the upper surface of the steel bracket. According to such a silo roof structure, it is possible to reduce the labor and cost of construction by using the steel bracket as a platform for lifting means when lifting the roof steel frame. In addition, instead of continuously forming the fixed portion of the roof portion with respect to the inner peripheral surface of the main body portion, it is possible to reduce the labor and material cost of construction by forming the steel bracket intermittently. it can.

  A plurality of bolt holes are formed in the steel frame bracket, and a base plate having a plurality of loose holes is fixed to the legs of the roof steel frame, and the steel bracket and the roof steel frame are connected to the bolt holes. It is preferable that the bolt is fixed by a bolt inserted through the loose hole. In this way, even when an earthquake load or wind load is applied to the roof portion, it is possible to limit transmission to the main body portion, and thus it is possible to reduce the cross section of the main body portion.

  According to the silo roof part construction method and the silo roof structure of the present invention, it is possible to construct the silo roof part easily and inexpensively.

It is sectional drawing which shows the coal silo which concerns on embodiment of this invention. (A) is a top view which shows the junction part of a roof steel frame and a steel frame bracket, (b) is the same side view. It is explanatory drawing of the construction method of the silo roof part of this embodiment. (A) is a perspective view which shows a steel frame bracket and an extending | stretching member, (b) The top view which shows the arrangement | positioning condition of the jack at the time of roof lifting, (c) is the same side view.

  This embodiment demonstrates the case where the silo for coal storage (henceforth only "coal silo 1") is constructed | assembled. As shown in FIG. 1, the coal silo 1 of the present embodiment includes a foundation slab 11, a silo body (body part) 12 erected on the foundation slab 11, and a roof part formed at the upper end of the silo body 12. 13.

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 14 is formed inside the silo body 12. An inner wall 15 is formed along the inner peripheral surface of the lower part of the silo body 12. The inner wall 15 has a truncated cone shape that decreases in diameter toward the lower side.
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 roof portion 13 includes a roof steel frame 2, a roof plate 3 that covers the roof steel frame 2, and a steel frame bracket 4 that is fixed to the silo body 12.
The roof portion 13 is formed with an opening (not shown) for charging coal. A receiving conveyor is inserted into the opening. The roof steel frame 2 supports the roof plate 3 and also functions as a support frame for the receiving conveyor. The roof board 3 of this embodiment is comprised with the steel plate. The roof plate 3 is bolted to the roof steel frame 2. In addition, the fixing method of the roof board 3 is not limited. Moreover, the material which comprises the roof board 3 is not limited, either.

The roof steel frame 2 of the present embodiment is a so-called truss frame formed by combining steel frames. The roof steel frame 2 is formed by combining a plurality of truss-like frame members 21, 21,. The plurality of frame members 21, 21,... Are arranged so as to spread radially from the center of the roof steel frame 2. The number of frame members 21 is not limited, and may be appropriately determined according to the size and shape of the coal silo 1.
The frame member 21 includes a lower chord member 22, an upper chord member 23, a plurality of cross members 24, 24,..., A plurality of diagonal members 25, 25,. In this embodiment, the frame member 21 is formed by combining H-section steel. In addition, the structure of the frame member 21 is not limited, What is necessary is just to form suitably. Moreover, the steel material which comprises the frame member 21 is not limited to H-section steel, For example, you may use L-section steel, a channel shape steel, etc.

The lower chord member 22 is a diagonal member disposed on the lower side of the frame member 21. As shown in FIG. 2B, the lower end of the lower chord material 22 is fixed to the base plate 28. The upper end of the lower chord material 22 is disposed at the center of the coal silo 1. As shown in FIG. 1, the upper end of the lower chord member 22 is fixed to the beam 26.
The beam 26 is a horizontal member that supports the receiving conveyor, and has one end fixed to the upper end of the lower chord material 22 and the other end fixed to an intermediate portion of the upper chord material 23. The beam 26 does not necessarily have to be horizontal. A girder (not shown) is fixed to the lower surface of the beam 26. The girder is a steel material formed in a circular shape, and connects the beams of the frame members 21, 21,. In the present embodiment, a plurality of girders having different inner diameters are arranged at intervals.

The upper chord member 23 is a diagonal member disposed on the upper side of the frame member 21. As shown in FIG. 2B, the lower end of the upper chord material 23 is fixed to the lower end portion of the lower chord material 22. Note that the lower end of the upper chord member 23 may be fixed to the base plate 28.
As shown in FIG. 1, the cross member 24 connects the lower chord member 22 and the upper chord member 23. In the present embodiment, the arrangement pitch of the cross members 24 is not limited and may be determined as appropriate. In the present embodiment, the cross member 24 is disposed so as to be substantially horizontal, but the cross member 24 may be inclined.

The diagonal member 25 connects the lower chord member 22 and the upper chord member 23. The diagonal member 25 is disposed so as to connect the intersection point of the cross member 24 and the lower chord member 22 and the intersection point of the cross member 24 and the upper chord member 23 on one level.
The vertical member 27 connects the central portion of the beam 26 and the upper end of the upper chord member 23. A cross member 24 and a diagonal member 25 are disposed between the vertical member 27 and the upper chord member 23.

  As shown in FIGS. 2A and 2B, the base plate 28 is a steel plate fixed to the leg portion of the frame member 21. A plurality (six in this embodiment) of bolt holes 29 are formed in the base plate 28. The base plate 28 is fixed to the steel frame bracket 4 through bolts B through which bolt holes 29 are inserted. The bolt hole 29 of the present embodiment is a so-called loose hole formed of a long hole that is long in the radial direction of the coal silo 1. The arrangement and number of the bolt holes 29 may be determined as appropriate in accordance with the positions of the bolt holes 43 formed in the steel frame bracket 4.

  The steel frame bracket 4 is fixed to the silo body 12 in a state of projecting toward the inner space at the upper end portion of the silo body 12. The same number of steel brackets 4 as the frame member 21 are fixed to the silo body 12 at positions corresponding to the arrangement of the frame member 21. A roof steel frame 2 is mounted on the upper surface of the steel frame bracket 4. The steel bracket 4 is made of an H-shaped steel including upper and lower flanges 41 and 41 and a web 42 disposed between the flanges 41 and 41. A plurality (six in this embodiment) of bolt holes are formed in the upper flange 41 of the steel bracket 4. The number and arrangement of the bolt holes in the upper flange 41 may be determined as appropriate. The roof steel frame 2 is fixed to the steel bracket 4 via bolts B through which bolt holes of the steel bracket 4 and bolt holes 29 of the base plate 28 are inserted.

  A fixing plate 43 is integrally formed at the base end of the steel frame bracket 4 (the wall side end of the silo body 12). The fixed plate 43 is made of a steel plate in which a plurality (16 in this embodiment) of anchor holes are formed. The fixing plate 43 is fixed to the silo body 12 by inserting the heads of the anchors 44, 44,... Implanted in the silo body 12 through the anchor holes and screwing nuts into the heads of the anchors 44. ing. The anchor 44 of the present embodiment has an L shape. It should be noted that the shape, number and arrangement of the anchors 44 are not limited. A grout material is filled between the wall surface of the silo body 12 and the fixed plate 43.

The construction method of the silo roof part of the present embodiment includes a roof assembly process, a roof lifting process, and a roof fixing process.
In the roof assembly process, as shown in FIG. 3, a part of the roof steel frame 2 is assembled at the inner bottom of the silo body 12 to form the ground steel frame 2 a. The assembling of the groundwork steel frame 2a is performed in a state where it is supported by the temporary supporter S disposed as necessary. In this embodiment, parts other than the leg part 2b (refer FIG. 4 (a)) of the roof steel frame 2 are assembled, and the structure steel frame 2a is formed.

In the roof lifting process, the ground steel frame 2 a is lifted on the upper end of the silo body 12.
As shown in FIGS. 4 (b) and 4 (c), a jack (lifting means) 5 is provided on each steel bracket 4 projecting inward from the upper end of the silo body 12. The grounding steel frame 2a is lifted using a jack 5. In this embodiment, a hydraulic jack (center hole jack) is used as the lifting means, but the lifting means is not limited to the hydraulic jack. Further, in this embodiment, the ground steel frame body 2a is lifted by the same number of jacks 5 as the steel brackets 4. However, the number and arrangement of the jacks 5 are as long as three or more jacks are evenly arranged. It is not limited.

  The jack 5 is disposed on the steel bracket 4 via a support frame (base) 51. In this embodiment, the extending member 52 is fixed to the distal end portion of the steel frame bracket 4. The support frame 51 is placed on the upper surface of the silo body 12, the upper surface of the steel frame bracket 4, and the upper surface of the extending member 52. As shown in FIG. 4A, the extending member 52 is formed with a recess 53 through which the end of the ground steel frame 2a can be inserted. The jack 5 is disposed immediately above the recess 53. The jack 5 lifts the ground structure steel body 2a by pulling up the wire W fixed to the end of the ground structure steel body 2a. All the jacks 5 are synchronized and pulled up while maintaining the level of the ground steel frame 2a. Then, the end of the ground structure steel body 2 a is inserted through the recess 53 of the extending member 52, and the ground structure steel body 2 a is lifted to a position higher than the steel bracket 4.

In the roof fixing process, the end of the ground steel frame 2 a is fixed to the upper end of the silo body 12.
Fixing of the steel structure 2a to the silo body 12 is performed by fixing the end of the steel structure 2a to the legs 2b of the roof steel frame 2 fixed to the upper surface of the steel bracket 4 (see FIG. 4A). To do. The joining method of the groundwork steel frame 2a and the leg part 2b is not limited, For example, what is necessary is just to join using welding or a gusset plate. The extending member 52 may be removed together with the jack 5 after the roof fixing step, or may be left. In the present embodiment, after the steel frame bracket 4 is formed on the upper end portion of the silo body 12, the leg portion 2 b is fixed on the steel frame bracket 4. Note that the steel bracket 4 may be formed by fixing a steel frame having the leg 2b fixed to the upper surface to the silo body 12. Moreover, the leg part 2b should just be fixed to the steel bracket 4 in the case of a roof fixing process, and the timing which fixes the leg part 2b to the steel frame bracket 4 is not limited. For example, the leg 2b may be fixed to the steel frame bracket 4 in parallel with the lifting of the ground structure steel frame 2a.

According to the construction method of the silo roof part of the present embodiment, the ground steel frame body 2 a is lifted and the roof steel frame 2 is formed at the upper end part of the silo body 12, so that the roof steel frame is formed at the upper end part of the silo body 12. Compared to the method of assembling 2, the workability is excellent.
Moreover, since the roof steel frame 2 is lifted in a state where it is divided into the ground steel frame body 2a and the leg portions 2b, it is possible to prevent the end portions (leg portions) of the roof steel frame 2 from coming into contact with the steel frame bracket 4.

Moreover, since the steel bracket 4 which is a permanent member is used as a pedestal for the jack 5, the labor and cost of construction can be reduced as compared with a case where a temporary pedestal is separately provided. Further, by fixing the extending member 52 to the steel bracket 4, a space necessary for placing the jack 5 can be secured at the upper end portion of the silo body 12. Moreover, since the recessed part 53 which can penetrate the edge part of the structure steel frame 2a is formed in the extending | stretching member 52, it is not necessary to extend the jack 5 more than necessary, As a result, the stand ( The scale of the support frame 51) can be minimized.
Cost reduction can be achieved by diverting the jack 5, the support frame 51, the extending member 52, and the like to the construction of another adjacent coal silo 1.

Moreover, since the fixed part of the roof steel frame 2 is not formed continuously with respect to the inner peripheral surface of the silo body 12, the steel frame bracket 4 is formed intermittently, so that the labor and material cost of construction are reduced. Can be achieved.
Further, by making the bolt hole 29 of the base plate 28 a loose hole, even when an earthquake load or wind load acts on the roof portion 13, it is possible to limit transmission to the silo body 12, and as a result, The cross section of the silo body 12 can be reduced.
By making the roof steel frame 2 a truss frame, the amount of the steel frame can be reduced, the burden on the silo body 12 can be reduced, and eventually the coal silo 1 as a whole can be slimmed.

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.
The stretching member 52 may be used as necessary and may be omitted.

1 Coal silo 11 Foundation slab 12 Silo body (main part)
13 roof part 2 roof steel frame 2a groundwork steel frame 2b leg part 28 base plate 29 bolt hole (loose hole)
3 Roof plate 4 Steel bracket 43 Bolt hole 5 Jack (lifting means)
51 Support frame (frame)
52 Stretch member 53 Recess

Claims (5)

A roof assembling step of assembling at least a part of the roof steel frame inside the cylindrical main body to form a ground steel frame;
A roof lifting step of lifting the ground steel frame to the upper end of the main body,
A roof fixing step of fixing an end portion of the ground steel frame to a steel bracket formed on an upper end portion of the main body portion, and a construction method of a silo roof portion comprising:
The steel bracket protrudes toward the inner space at the upper end of the main body,
In the roof lifting step, the building steel frame body is lifted by lifting means provided on the steel frame bracket. An extending member is fixed to the tip of the steel bracket,
The lifting means is provided via a mount placed on the upper surface of the main body, the upper surface of the steel bracket, and the upper surface of the extending member,
The construction method of the silo roof part according to claim 1, wherein the extending member is formed with a recess through which an end of the ground steel frame can be inserted.   The silo according to claim 1 or 2, wherein, in the roof fixing step, an end portion of the suspended steel frame body is fixed to a leg portion fixed in advance to an upper surface of the steel bracket. How to build the roof. A plurality of steel brackets fixed to the inner wall surface of the cylindrical main body,
A silo roof structure comprising a roof steel frame mounted on an upper surface of the steel frame bracket. The steel bracket is formed with a plurality of bolt holes,
A base plate in which a plurality of loose holes are formed is fixed to the legs of the roof steel frame,
The silo roof structure according to claim 4, wherein the steel bracket and the roof steel frame are fixed by a bolt inserted through the bolt hole and the loose hole.

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