JP2764894B2 - How to build a cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is suitable for use in constructing a cylindrical portion of a large silo such as a coal storage silo.
The present invention relates to a method for constructing a cylindrical body.

[0002]

2. Description of the Related Art Conventionally, when a cylindrical body of a large silo such as a coal silo is constructed from concrete, a hydraulic jack is used without removing the form from concrete by using a form made of sliding foam. And the yoke have been slid upward continuously or intermittently, and concrete has been cast in the form of casting.

[0003]

However, in such a method, the reinforcing work is concentrated at one time in order to slide the formwork at a standard speed corresponding to the strength development of the concrete or at a time pitch. Therefore, labor concentrates on the rebar arrangement work during the waiting time for concrete hardening, and the work process becomes extremely hard. In addition, in a narrow working space near the top of the skeleton where the formwork being slid is located, a large amount of reinforcement and PC steel wire wiring work are performed, so workability is poor. Further, the scaffolding around the top of the concrete skeleton is occupied as a storage area for materials such as reinforcing bars and PC steel wires for arranging reinforcement, so that a work yard required for other work cannot be sufficiently taken.
In view of the above circumstances, the present invention provides a method of constructing a cylindrical body that can optimize a work process related to a reinforcing work, enables efficient reinforcing work, and requires a small space for material storage. Is what you do.

[0004]

That is, according to the first aspect of the present invention, when constructing a cylindrical body (3) made of cast-in-place concrete (40), the cylindrical body (3) is removed. The movable divided formwork (15, 16) is formed into a cylindrical body (15, 16) so as to form a concrete casting space (14) having a predetermined height (H1) divided into a plurality of pieces along the circumferential direction. A plurality of 3) are installed along a place to be constructed, and concrete (40) is cast in place in a concrete casting space (14) formed by each of the plurality of divided formwork (15, 16).
A plurality of partial cylinders (31) each forming a part of the cylinder (3) are formed, and the cylinder (3) at a predetermined level is constructed from the partial cylinders (31) constructed with a time difference. Is configured. Further, claim 2 of the present invention
According to the invention described in the first aspect, in the method of constructing a tubular body according to the first aspect, each of the plurality of divided formwork (15, 16) is selectively moved upward with respect to another divided formwork (15, 16). The partial cylindrical bodies (31) are formed in such a manner that the partial cylindrical bodies (31) are stacked upward by raising the divided molds (15, 16). The numbers and the like in parentheses are for convenience showing the corresponding elements in the drawings, and therefore, the description is not limited to the description on the drawings. The same applies to the following operation columns.

[0005]

According to the above-mentioned structure, the first aspect of the present invention acts to construct a plurality of partial cylinders (31) arranged in the circumferential direction at a predetermined level at different times. The invention according to claim 2 of the present invention provides a divided formwork (15, 20) used for constructing a partial cylindrical body (31).
16) is moved upward above the constructed partial cylinder (31), and is used to construct a new partial cylinder (31) to be inherited above the partial cylinder (31). I do.

[0006]

FIG. 1 is a cross-sectional side view showing an example of a silo made of a cylinder constructed according to the present invention, FIG. 2 is a plan sectional view of a cylinder portion of the silo shown in FIG. 1, and FIG. 3 is a cylinder shown in FIG. FIG. 4 is a perspective view showing an example of a wife stop portion used for a splicing portion of the body, FIG. 4 is a view showing a state in the middle of construction of the cylinder shown in FIG. 2, and FIGS. 5 to 10 are constructions of the cylinder shown in FIG. FIG. 11 is a process chart showing work procedures for each section in the cylindrical body shown in FIG. 2 in a table, and FIG. 12 shows another example of a grommet used for a splicing portion of the cylindrical body. FIG. 13 is a plan view showing still another example of a stop for a splicing portion of a cylindrical body.

[0007] As shown in FIG. 1, the silo 1 has a concrete bottom frame 2, and the bottom frame 2 is ground G
It is provided in the shape of a disk in a depression of the ground 39 dug down to a predetermined depth from L. A cylindrical body 3 made of cast-in-place concrete 40 reinforced with a steel frame, a reinforcing bar, or the like is erected on the bottom body 2 in a cylindrical shape. The pilaster portion 3b is formed so as to continuously protrude in the vertical direction. A storage space 30 for storing powder and granules such as coal and limestone is inside the cylinder 3.
Is formed in a columnar shape, and a roof 5 made of a steel truss or the like is assembled on a truss and has a finish roof on the upper side of the cylindrical body 3.
However, only the conveyor pit 5a is opened and the storage space 30 is opened.
Is provided in a closed state. Near the upper end of the storage space 30, a stacker 5b and a receiving conveyor 5c are provided.
Is provided in a form supported by steel members of the roof 5,
In the vicinity of the lower end of the storage space 30, a concrete hopper frame 6 is provided so as to be connected to the bottom frame 2 and the cylinder 3. The hopper frame 6 is provided with several hopper ports 60 extending in a direction intersecting the plane of FIG.

As shown in FIG. 2 or FIG. 4, the cylinder 3 is divided into a plurality of pieces along the circumferential direction shown by arrows C and D, each of which has a height H1. Is formed by connecting a plurality of cylindrical blocks 31 made of concrete 40, and the plurality of cylindrical blocks 31
As shown in FIG. 2, six cylinder rings 3R are formed in a circular shape in a line along the circumferential direction, and the six cylinder blocks 3R are formed.
As shown in FIG. 4, each of the cylindrical blocks 31 is a partial cylindrical body that forms a part of the cylindrical body 3 in a form in which a plurality of cylindrical rings 3 </ b> R configured by 1 are vertically stacked. . A predetermined amount of reinforcing steel 32 is provided in the cylindrical body 3.
A predetermined amount of reinforcement is embedded as a horizontal reinforcement arranged in the circumferential direction (directions of arrows C and D) and a vertical reinforcement arranged in the vertical direction. The six cylindrical blocks 3 in which the line 32 is arranged in the circumferential direction shown by arrows C and D
1 are provided at a predetermined pitch in the up and down direction so as to form a binding shape. Further, as shown in FIG. 2, a joint portion 3 a is provided between the cylindrical blocks 31, 31 which are adjacent to each other in the circumferential direction shown by arrows C and D in FIG. 2. In FIG. 2, a splicing member 9, which is a vertical joint member, extends in a direction (vertical direction) crossing the plane of FIG. 2 so as to connect the concrete of the cylindrical blocks 31, 31 adjacent in the circumferential direction to each other. Each is provided.

As shown in FIG. 3, each stop 9 has a precast concrete plate 10 formed to have a predetermined length in the vertical direction, and the plate 10 of the embodiment shown in FIG. The body 10 is divided into two divided plate bodies 10p and 10p which can be divided by a horizontal streak insertion portion 10a described below by arrows A,
The cylindrical body 3 is formed so as to have a thickness substantially coinciding with the thickness of the cylindrical body 3 in the directions indicated by arrows A and B in the form of a pair in the direction B. Further, concrete placing surfaces 10c and 10c are formed on two side surfaces of the plate body 10 facing in the directions of arrows C and D, respectively.
0a are formed in such a manner that they penetrate in the horizontal direction from one of the concrete placing surfaces 10c and 10c toward the other, that is, penetrate the plate 10 along the circumferential direction of the cylindrical body 3. I have. The PC steel wire 33 is inserted into the horizontal streak insertion portion 10a.
Is inserted through the PC sheath 35 and the reinforcing bar 32 as a horizontal bar.
However, among the horizontal streak insertion portions 10a provided in the plate 10, the horizontal streak insertion portions 10a provided at the upper and lower ends of the plate 10 each have a groove shape, Opposite horizontal streak insertion portions 1 of plate bodies 10, 10 vertically adjacent to each other
0a and 10a are formed so that one horizontal streak can be penetrated. Further, the plate 10 is provided with a plurality of bolt holes 10b as a form fixing means,
The bolt holes 10b are formed so as to be opened at both end surfaces in the direction, and the bolt holes 10b are formed so that the bolts 11 are fitted to fix the plate body 10 to a mold for constructing the cylindrical block 31. Has become.

Since the silo 1 has the above-described configuration, when constructing the silo 1, first, the ground 39
After the stabilization, the bottom frame 2 is constructed into a predetermined shape by cast-in-place concrete, and then the hopper frame 6 is formed into a predetermined shape on the bottom frame 2 by forming a plurality of hopper openings 60. . Then, the cylindrical body 3 is constructed together with the construction of the hopper body 6 or after the completion thereof. By the way, when constructing the cylindrical body 3, first, as shown in FIG. 2, the cylindrical body 3 to be constructed is divided into six along the circumferential direction shown by the arrows C and D, and six construction sections are formed. GP, that is, GP1 to GP6 are set. And for each construction section GP,
A single formwork device 13 capable of placing and constructing the cylindrical block 31 is installed one by one, and is used while jumping up for each construction section GP to form a concrete 4 having a predetermined height H1.
The cylinder block 31 is constructed by placing 0, and the cylinder block 31 is connected in the cylinder circumferential direction shown by arrows C and D in FIG. 2 and in the vertical direction (intersecting direction with the paper surface in FIG. 2). Build and build in the form. In FIG. 4, details of the form device 13 are omitted for convenience of the drawing.
As shown in FIGS. 5 to 10, an outer mold frame 15 and an inner mold frame 16, which are divided mold frames capable of forming a concrete casting space 14 having a predetermined height H1 corresponding to the shape of the cylindrical block 31. And the outer mold 15 and the inner mold 16 can be driven close to and away from each other (that is, the concrete casting space 14 can be formed freely and the mold can be removed from the cylindrical block 31). And an inner mold 16 which is configured to selectively lift and position the inner mold 16 with respect to the outer mold 15 and the inner mold 16 of another mold apparatus 13.

By the way, in order to construct one cylindrical block 31, the working steps are set in six steps ST1 to ST6 shown in FIGS. Then, in each of the six work sections GP described above, as shown in FIG. 4, work is separately performed in such a manner that any one of the different work steps ST1 to ST6 is selectively advanced. Is performed, and the cylindrical body building work is advanced in such a manner that the cylindrical body blocks 31 are piled up for each of the construction sections GP. In addition, each process ST for constructing one cylindrical block 31 includes one step ST.
Since the amount of work is completed in a day,
When ST6 takes six days, one cylindrical block 31
Has been completed. The following steps ST1 to ST1
The work content of ST6 will be described. This is because when the top end 31a is located at the height L0, the height L0 above the height L0 is set.
1 describes the procedure for constructing a new cylindrical block 31.

That is, to construct the cylindrical block 31,
First, as a work on the first day, as shown in FIG. 5, the vertical streak unit 320 shown in the upper right of FIG. 5 is assembled in step ST1. In the step ST1, the longitudinal streak unit 320 is assembled in such a manner that the top end 31a, which is a horizontal joint portion, is subjected to the latence processing, and the reinforcing bar 32 is used as a vertical streak together with the PC sheath tube 35 in a unit cage shape. Then, the vertical bar unit 320 is erected on the top end 31a, and the vertical reinforcing bar 32 is jointed and joined with a mechanical coupler 36, and the PC sheath tube 35 is adjacent to the vertical direction in the direction crossing the plane of FIG. To the PC sheath tube 35. Further, a PC board corresponding to the shape of the pilaster portion 3b is attached in a form that can be connected to the cylindrical block 31 later (that is, at a position that can be connected to the concrete placing space 14 after the form is lifted).

Next, as a work on the second day, as shown in FIG. 6, a horizontal streak unit 321 shown in the upper right of FIG. 6 is assembled in step ST2. In the process ST2, the assembled horizontal streak unit 321 is attached to predetermined positions near the inner side (right side in FIG. 6) and the outer side (left side in FIG. 6) on the top end 31a. The joint of the reinforcing bar 32 is lap joint welded. In this way, while the reinforcing bar 32 is erected as a horizontal reinforcing bar, that is, a horizontal bar, the plate 10 of the spigot stopper 9 is fixedly installed at the location to be the joint portion 3a. At this time, since the construction work of the cylinder 3 is performed for each cylinder block 31, if the adjacent cylinder block 31 has already been constructed earlier,
Joint portion 3a between the constructed cylindrical block 31
Already has the plate 10 of the wife stopper 9, so there is no need to install the plate 10 here. In addition, since the horizontal bar insertion portion 10a is provided in the plate body 10 of the wife stopper 9, if the PC sheath pipe 35 or the reinforcing bar 32 is passed through the horizontal bar insertion portion 10a, the inside and outside of the concrete placing space 14 to be formed therefrom are formed. The PC steel wire 33 and the horizontal streak can be arranged in such a manner as to communicate with. The plate body 10 is installed by passing the PC sheath pipe 35 through each of the reinforcing bar insertion portions 10a in the middle of the arrows A and B in FIG. 3 and aligning the divided plate bodies 10p and 10p in the left-right direction in FIG. It can be easily performed by combining them in the directions of arrows A and B.

Therefore, as the work on the third day, the process ST
7, as shown in FIG. 7, the concrete block 40 is cast first under the cylindrical block 31 to be constructed, and the top end 31a is located at the height L0.
Demold 1, Keren and Plastering. It should be noted that the assembled cylindrical block 31 whose top end 31a is located at the height L0.
As shown in FIG. 11, three days have passed since the concrete 40 was cast.
Steps ST3 are operations under the top 31a, while ST1 and ST2 are operations under the top 31a. In the step ST3, the outer mold 15 and the inner mold 16 formed by casting the cylindrical block 31 that has been cast are spread outward and inward as shown in FIG. Demold in shape. Then, the concrete-casting surfaces of the detached outer mold frame 15 and inner mold frame 16 are cleaned with keren, respectively, and a release agent is applied thereto. In addition, the exposed concrete surfaces 31b, 31b on the left and right sides in FIG. 7 of the removed cylindrical block 31 are plastered and repaired. In addition, preparation for raising the formwork is carried out in such a way that the formwork support hardware, safety equipment, etc. are replaced.

Next, as an operation on the fourth day, a process ST4
As a result, as shown in FIG. 8, the inner mold 16 is lifted. That is, as shown in FIG. 7, the inner mold frame 16 that has been removed from the cylindrical block 31 that previously forms the top end 31 a is newly driven by the removing unit 17 to be newly constructed. Is raised by the height H1 (i.e., L1-L0) of the cylindrical body 3, and is erected at a position along the inner peripheral surface of the cylindrical body 3 at the raised position. Then, check, adjust, and confirm the installation accuracy and the like.

Next, as an operation on the fifth day, a step ST5
As a result, as shown in FIG.
This is performed in the same manner as the lifting of the inner frame 16 described above. Then, since the printing plate 10 of the stop 9 has already been installed in the portion to be the joint portion 3a of the tubular block 31 to be constructed in the previous step ST2, the fourth day and the fifth day
By raising the inner form 16 and the outer form 15 by the processes ST4 and ST5 performed on the day, a concrete placing space 14 is provided between the inner form 16 and the outer form 15 on the top end 31a.
Is formed. Then, the formed concrete placing space 14 is subjected to the above-described steps ST1 and ST2.
Necessary reinforcement and wiring are already applied to the cylindrical block 31.

Therefore, as shown in FIG. 10, as an operation on the sixth day, concrete 40 is cast in the concrete casting space 14 on the top end 31a in step ST6. Then, the newly cast concrete forms a new top end 31a 'at a position where the height L1 is higher than the height L0 by the height H1, and the uncured cylindrical block 31 is completed. In the present invention, the cylinder 3 is constructed for each cylinder block 31.
As shown in (1), the construction is performed in such a manner that a different process ST is performed for each construction section GP. For this reason, in the construction section GP which is the most advanced when the concrete 40 is poured, the adjacent cylindrical block 31 has not been constructed yet, but the cylindrical block 31 to be constructed now and the unconstructed cylindrical block adjacent thereto are constructed. Since the plate body 10 of the precast concrete stop 9 is installed in the joint portion 3a of the body block 31, the precast plate body 10 is integrated with the concrete 40 cast in the concrete casting space 14. In such a manner, the leading cylinder block 31 can be formed so as to be independent. In particular, since the plate body 10 is made of precast concrete, the side pressure F along the directions indicated by arrows C and D in FIG. 3 when the concrete 40 is cast can be supported with sufficient surface rigidity. For this reason, when the concrete 40 is cast, the vibrator can be sufficiently vibrated and the concrete 40 can be firmly compacted without fear of the wife stopper coming off. Furthermore, since the plate body 10 is thrown away as a part of the cylindrical body 3 at the joint portion 3a, there is no need for the work of removing and stopping the wife. Further, as described above, the plate body 10 is provided with the PC through the transverse streak insertion portion 10a.
Since the PC sheath 35 of the steel wire 33 and the reinforcing bar 32 for the horizontal bar can be inserted, the cylindrical block 3 previously constructed
It is preferable to form a concrete casting space 14 next to 1 and simply cast concrete 40 therein to connect and integrate another tubular block 31 with the constructed tubular block 31. I can do it.

Therefore, in step ST6, the concrete 4
In the construction section GP where 0 is cast, the next day, the process returns to the process ST1 again, and the newly formed top end 31a 'is formed.
Above, the vertical streak unit 320 in the step ST1
Then, the next day, in a step ST2, the horizontal streak unit 321 is assembled, and the cylindrical block 31 is moved to a position on the top end 31a 'at a height L2 in FIG. 10.
Do the work of building. Then, on the next day, in the form of performing step ST3, the cylindrical block 31 cast and formed so as to form the top end 31a 'at the height L1 as described above is removed, and further, one step per day. The cylindrical blocks 31 are sequentially piled up for each construction section GP in such a manner as to proceed.

In this way, in each section GP, the outer form 15 and the inner form 16 of the form apparatus 13 are connected to the other form apparatus 1.
By repeating steps ST1 to ST6 in such a manner that the outer mold frame 15 and the inner mold frame 16 are selectively raised, the cylindrical blocks 31 located in each construction section GP are stacked upward. The cylinder 3 is constructed and extended upward.
That is, if the construction sections GP are divided into six sections in a form corresponding to the six-step steps ST, as shown in FIG. Any one of the different working steps can be selectively performed. Therefore, after one day's work is completed, the next day, the work section GP in which each process ST is to be performed is moved in the direction of arrow D in FIG. It is moved to the next construction section GP on the side of the arrow D direction 2 and work is performed here. For example, one day,
If the process ST1 is performed in P1, the location where each process ST is performed is shifted so that the process ST1 is performed in the construction section GP2 the next day, and the ST1 is performed in the construction section GP3 the next day. Then, as shown in FIG. 4, as shown in FIG. 4, each cylinder block 31 is constructed so that the degree of progress is different for each construction section GP, and as a result, a cylinder at a predetermined level such as each cylinder ring 3R is formed. The body 3 is constructed by six cylindrical blocks 31 constructed with a time difference. For this reason, the cylindrical body 3
When the construction is performed, the reinforcement arrangement work does not have to be performed at once for the entire circumference, and the arrangement of the reinforcements can be performed for each cylindrical block 31 in a distributed manner. Therefore, the work process related to the bar arrangement work does not become critical, and efficient bar arrangement can be performed. In addition, since it is not necessary to temporarily place the reinforcing bars 32 for the entire circumference of the cylindrical body 3 all at once in the vicinity of the construction site, the space for placing the reinforcing bars 32 for arranging the bars is small. Therefore, even if the scaffold around the top end of the cylindrical body 3 under construction is narrow, it is not occupied by a large amount of the reinforcing steel 32 or the PC steel wire 33, so that other work other than the reinforcing arrangement also proceeds smoothly. Can be done.

When the cylindrical body 3 is efficiently constructed in this manner, the construction of the silo 1 is completed by covering the roof 5. Then, when the granular material is stored in the storage space 30 in the silo 1,
A tensile force is generated in the cylinder 3. At this time, the cylindrical blocks 31, 31 horizontally adjacent to each other are connected to the plate 10 of the spigot 9 driven as a splicing member, and the horizontal reinforcing bars 32 and the PC which are arranged so as to penetrate the plate 10. Since the steel wires 33 are securely connected and integrated, the horizontal stress transmission is properly performed between the adjacent cylindrical blocks 31. Therefore, each cylindrical block 31 can appropriately support the tensile force as a part of the cylindrical ring 3R. In this manner, the cylindrical ring 3R is distributed and constructed with a time difference for each construction section GP at the time of construction,
Although it is not necessarily performed in a ring shape at once, after the cylindrical body 3 is constructed, the stress can be effectively supported as a ring-shaped frame.

In the above-described embodiment, when the cylindrical block 31 is cast, the vertical joint member is installed at the joint 3a between the horizontally adjacent cylindrical blocks 31, 31. In the above description, the locking member 9 using the plate body 10 in which the horizontal streak insertion portion 10a is formed in a mere hole or groove shape is used, but as shown in FIG. Concrete casting surface 20 on the side
c, 20c are formed, and bolt holes 2
A plurality of PC sheath tubes 35 are embedded in the reinforcing bar insertion portions 20a of the concrete plate 20 provided with a plurality of 0b in advance in such a manner as to penetrate the plate 20 in the horizontal direction and in a direction intersecting the paper surface of FIG. The wife stop 19 may be used. This makes it easier to unbond the PC steel wire 33 in such a manner that the plurality of cylindrical blocks 31 arranged in the circumferential direction are tightly connected. The position and number of the PC steel wires 33 and the reinforcing bars 32 in the horizontal direction that are wired and arranged on the cylinder 3 are arbitrary.
The arrangement state of the reinforcing bar insertion portions 10a provided on 0 and 20 also
It may be formed arbitrarily in a form corresponding to the wiring and reinforcing arrangement of the cylindrical body 3. Further, the wife stopper 9 of the embodiment shown in FIG.
The plate body 10 is composed of divided plate bodies 10p and 10p which can be divided via the middle reinforcing bar insertion portion 10a.
The plate 10 may be indivisible, as in the case of FIG. 12 described above. Further, the plate body may be formed of a plurality of divided plate bodies that can be vertically divided by the grooved reinforcing bar insertion portion 10a as shown by the one-dot chain line at the upper end of FIG. In this way, the plate bodies can be installed in a form in which the divided plate bodies are stacked while the reinforcing bar 32 and the PC steel wire 33 are inserted through the groove-shaped reinforcing bar insertion portion 10a.

Further, as another vertical joint member to be installed in the joint portion 3a, a spigot stopper 2 shown in FIG.
As shown in FIG. 13, the reinforcing member 32 is provided in advance on the plate 22 having two concrete facing surfaces 22 c, 22 c formed on two opposite sides, and the concrete stopping surface 22 c is provided. It may be buried and fixed so as to project in the horizontal direction from each other. Then, the reinforcing bars 32 fixed to the plate 22 are arranged in the concrete placing spaces 14 formed on both the left and right sides of the plate 22, respectively. When the cylindrical body 3 is constructed, the process ST in progress in each section GP is shifted, so that the concrete placing spaces 14 on the left and right sides of the printing plate such as the printing plate 22 are shifted in formation time. . However, the left and right sides of the plate body such as the plate body 22 become the cylindrical blocks 31 and 31 later, and become a part of the cylindrical ring 3R, that is, a part of the cylindrical body 3. Therefore,
As shown by the dashed line in FIG. 13, the reinforcing bar 32 protruding in the horizontal direction from the concrete placement surface 22 c as described above,
If the reinforcing bars 32 for the horizontal streaks required for the cylindrical block 31 are connected by welding, they can be easily connected to the adjacent cylindrical blocks 31, 31 without trouble of penetrating the plate of the spigot 21 which is a vertical joint member. A horizontal streak can be applied in a straddling manner. The form fixing means provided on the plate body 22 is the same bolt hole 22b as the bolt holes 10b and 20b provided on the plate bodies 10 and 20 described above. The bolt holes need not be the ones described in the embodiments, and their configuration and arrangement position are arbitrary. Therefore, the plate body may be fixed to a mold such as the outer mold frame 15 and the inner mold frame 16 by using hardware such as pins, anchors, and hooks.
These hardware may be continuously mounted on the plate of the vertical joint member. Further, as shown in FIG. 13, the wedge stopper, which is a vertical joint member, has irregularities 2 on the concrete placing surface 22c (the left and right side surfaces in FIG. 13) of the plate 22.
2a may be formed as concrete adhering means in a form capable of enhancing adhesion to the concrete 40. Then, the concrete poured into the concrete placing space 14 on the side of the plate 22 and the plate 22 are further reliably integrated, and the plate 22 and the left and right cylindrical blocks 31, 31 are integrated. Thus, stress transmission is ensured, and the cylindrical body ring 3R can more accurately develop a ring-shaped supporting force. The unevenness 22a may be the uneven shape itself of the concrete placing surface 22c, or may be any projecting member other than concrete embedded and mounted on the plate 22.

In the embodiment, when the cylindrical body 3 is constructed, it is necessary to divide the cylindrical body 3 into six sections GP and to form each cylindrical body block 31 in a stepwise manner. The example has been described in which each of the cylindrical blocks 31 is constructed in such a manner that one of the six steps ST, which is different from each other, is advanced separately for each of the construction sections GP. However, when the cylindrical body 3 is constructed, the cylindrical body 3 at a predetermined level may be constructed from the cylindrical body block 31 constructed with a time difference.
Is not limited to the six work sections GP and the process ST as described in the embodiment, and the same work process may be performed in two work sections. Further, in the embodiment, the outer mold 15 and the inner mold 16 which are the divided molds for forming the concrete casting space 14 are divided into respective construction sections GP.
An example was described in which a plurality of the form blocks were installed one by one, and the outer form frame 15 and the inner form frame 16 were moved upward to stack the form blocks 31 of each construction section GP upward. However, the divided form is not limited to the upper part,
If it is possible to move even in the circumferential direction, there is no need to install one unit for each construction section GP. That is, the divided formwork can be diverted in different construction sections GP. In addition, in the embodiment, the heights H1 of all the cylindrical blocks 31 are the same, but the heights H1 of the cylindrical blocks 31 which are the partial cylindrical bodies are not necessarily all the same. It may be different depending on the level.

[0024]

As described above, according to the first aspect of the present invention, when constructing the cylindrical body 3 made of cast-in-place concrete, the cylindrical body 3 is moved along the circumferential direction. A movable outer mold 15 is formed so as to form a concrete casting space 14 having a predetermined height H1 divided into a plurality of parts.
A plurality of divided formwork such as the inner formwork 16 is installed along the place where the cylindrical body 3 is to be constructed, and the concrete 4 is placed in the concrete placing space 14 formed by each of the plurality of divided formwork.
0 is cast on site to form a plurality of partial cylinders such as a cylinder block 31 that forms a part of the cylinder 3, and the cylinder 3 at a predetermined level is constructed with a time difference. Therefore, each of the plurality of partial cylinders arranged in the circumferential direction at a predetermined level can be constructed at different times. Then, the reinforcing work for constructing the cylindrical body 3 does not need to be performed at the same time for the entire circumference of the cylindrical body 3 and is formed in such a manner that the cylindrical body 3 is divided into a plurality along the circumferential direction. It can be performed in divided units for constructing a partial cylindrical body. For this reason, the work process related to the arrangement work is optimized. In other words, when a bar arrangement work is being performed at a place where a certain partial cylinder is to be constructed, a place where another partial cylinder arranged at the same level as the partial cylinder being subjected to the reinforcement arrangement work should be constructed. Each of the plurality of partial cylinders located at a predetermined level can be constructed with a time difference by performing an operation other than the arrangement of the bars. For this reason, the reinforcing work is not concentrated at one time. Therefore, the work is appropriately dispersed, and there is no danger of causing a waiting time or becoming critical in the work process, and an efficient reinforcing work can be performed. In addition, the amount of rebar required for the work of arranging the partial cylinder is only a fraction of the amount of rebar when all the circumference of the cylinder is laid all at once. There is also a small space for material storage. For this reason, since a reinforcing bar is not occupied on the scaffold, a sufficient working space required for constructing the partial cylindrical body is secured on the scaffold. In addition, since it is not necessary to lift a large amount of rebar at a time, the process of heavy machinery is not critical. Therefore, even when a large silo cylinder is constructed of cast-in-place concrete, the cylinder can be efficiently and safely constructed and advanced.

According to a second aspect of the present invention, in the method for constructing a cylindrical body according to the first aspect, each of the plurality of divided molds is selected with respect to another divided mold. It is provided so as to be movable up and down, and the partial cylindrical body is formed to be stacked upward by raising the divided form, so that it is used for constructing a partial cylindrical body. The divided formwork that has been raised can be moved upward above the constructed partial cylindrical body, and used to construct a new partial cylindrical body to be connected to above the partial cylindrical body. Then, when the cylindrical body 3 is constructed as described in claim 1, concrete is sequentially launched into the concrete casting space 14 formed by the divided formwork while gradually moving the divided formwork upward. In this way, the cylindrical body 3 can be constructed for each unit divided into a plurality of units along the circumferential direction. At this time, since each divided formwork can be moved up regardless of where the other divided formwork is placed, the cylindrical body 3 is divided into other units by every one unit. It can be separately extended upwards. Then, the entire cylindrical body 3 is divided into a plurality of sections along the circumferential direction so as to correspond to the divided formwork, and the division work can be performed in such a manner that partial tubular bodies are stacked for each section. In addition, since the divided formwork is diverted upward in a form of being moved upward, the construction period can be shortened.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view showing an example of a silo using a cylindrical body constructed according to the present invention.

FIG. 2 is a plan sectional view of a cylindrical portion of the silo shown in FIG.

FIG. 3 is a perspective view showing an example of a stop portion used for a splicing portion in the cylindrical body shown in FIG. 2;

FIG. 4 is a view showing a state during the construction of the cylinder shown in FIG. 2;

FIG. 5 is one of a series of drawings showing a procedure for constructing the cylindrical body shown in FIG. 2;

FIG. 6 is one of a series of drawings showing a procedure for constructing the cylinder shown in FIG. 2;

FIG. 7 is one of a series of drawings showing a procedure for constructing the cylinder shown in FIG. 2;

FIG. 8 is one of a series of drawings showing a procedure for constructing the cylindrical body shown in FIG. 2;

FIG. 9 is one of a series of drawings showing a procedure for constructing the cylindrical body shown in FIG. 2;

FIG. 10 is one of a series of drawings showing a procedure for constructing the cylindrical body shown in FIG. 2;

FIG. 11 is a process chart showing a work procedure for each section in the cylindrical body shown in FIG. 2 in a table.

FIG. 12 is a plan view showing another example of a wife stop used for a joint portion of a cylindrical body.

FIG. 13 is a plan view showing still another example of a marriage stop used for a joint portion of a cylindrical body.

[Explanation of symbols]

 3 ... cylindrical body 31 ... partial cylindrical body (cylindrical block) 14 ... concrete placing space 15, 16 ... divided formwork (outer formwork, inner formwork) 40 ... concrete

Continuation of the front page (56) References JP-A-5-272256 (JP, A) JP-A-54-56221 (JP, A) JP-A-49-55141 (JP, A) Jikken 49-45077 (JP, A) , Y1) (58) Field surveyed (Int. Cl. ⁶ , DB name) E04H 7/26 E04H 7/18 301 E04G 11/22

Claims (2)

(57) [Claims] When constructing a cylindrical body made of cast-in-place concrete, the cylindrical body is divided into a plurality along the circumferential direction to form a concrete casting space having a predetermined height, A plurality of movable divided formwork is installed along a place where the cylindrical body is to be constructed, and concrete is cast in place into a concrete casting space formed by each of the plurality of divided formwork, and the cylindrical body is formed. A method of constructing a cylindrical body, comprising forming a plurality of partial cylindrical bodies that form a part of the above, and constructing the cylindrical body at a predetermined level from the partial cylindrical body constructed with a time difference. 2. A method according to claim 1, wherein each of the plurality of divided molds is provided so as to be selectively movable upward with respect to the other divided molds. The method for constructing a cylindrical body according to claim 1, wherein the cylindrical body is formed in a stepped shape.