JP2012192708A - Method of manufacturing concrete pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a concrete pole capable of easily manufacturing the concrete pole more strongly than before.SOLUTION: The method of manufacturing the concrete pole includes steps of arranging a plurality of battens on an outer surface of an outer cylinder and covering the outer cylinder and the battens in the lump with a mold sheet, installing the outer cylinder covered with the mold sheet in a sand mold frame with an insert hole pierced, charging sand into between the mold sheet and the sand mold frame and transferring a pattern to the sand, pulling out the battens and the outer cylinder from the mold sheet, removing the mold sheet, installing a cylindrical inner cylinder alternately equipped with pluralities of windows and blades and equipped with an intermediate plate therein in the insert hole in the mold frame and installing a cylindrical reinforcement between the sand and the inner cylinder, pouring mortar into the inner cylinder from an upper end of the inner cylinder and making it flow out to the outside of the inner cylinder through the windows and pulling upward while rotating the inner cylinder and stirring the mortar by the blades to charge the mortar up to an upper end of the sand mold, and pulling out the charged mortar from the sand mold after cured.

Description

  The present invention relates to a method for manufacturing a concrete pillar.

  Concrete secondary products such as concrete columns (concrete columns) were manufactured by placing concrete in a mold made of metal or plastic and curing the concrete.

  As in Patent Document 1, using a mold with an inner mold having irregularities on the inner surface, after a spraying step of spraying cosmetic aggregate on the surface of the inner mold, a core in which reinforcing bars are assembled is installed, An invention of a method of manufacturing a patterned cylindrical gate pillar in which concrete put into the formwork is placed while rotating the formwork is also disclosed.

  However, since the invention described in Patent Document 1 uses a metal or plastic mold as a mold, it is necessary to manufacture a large number of molds, and therefore there is a problem that extra costs and time are required. In addition, once the mold is manufactured, there is a problem that the shape cannot be easily changed.

Japanese Patent Laid-Open No. 07-1117024

  Accordingly, the present invention provides a concrete column manufacturing method that can easily manufacture a concrete column without manufacturing a metal or plastic formwork, and is stronger than conventional ones.

  In order to solve the above-mentioned problems, the present invention provides a method for manufacturing a hollow concrete column having a pattern on the outer surface and reinforced with reinforcing bars, and a plurality of trees are provided on the outer surface of a cylindrical outer cylinder. Arranging and covering the outer cylinder and the tree together with a mold sheet having a pattern on the outer surface and a plurality of strings on the inner surface, with the inner surface facing inward, and the mold sheet covering the A step of installing the outer cylinder in a sand mold frame having an insertion hole smaller than the outer diameter of the outer cylinder in the center of the bottom, and a space provided between the mold sheet and the sand mold frame is filled with sand and consolidated A step of transferring the pattern of the mold sheet to the sand, a step of removing the wood and removing the outer cylinder from the mold sheet, a step of removing the mold sheet, and a plurality of windows in the middle of the cylinder. An intermediate plate that is provided with a plurality of wings alternately and divides the interior vertically into the bottom of the window. An inner cylinder provided in the insertion hole of the sand mold frame, a step of installing a cylindrical reinforcing bar between the sand transferred with the pattern and the inner cylinder, and an inner cylinder from an upper end opening of the inner cylinder Filling the mortar into the upper end of the sand mold by pouring the mortar into the outside and outflowing from the window to the outside of the inner cylinder while gradually rotating the inner cylinder and stirring the mortar with the wings to the upper part; The method comprises the step of extracting the mortar from the sand mold after the filled mortar has hardened.

  A method of manufacturing a bottomed hollow concrete column having a pattern on the outer surface and reinforced with reinforcing bars, wherein a plurality of trees are arranged on the outer surface of a cylindrical outer cylinder, and the outer cylinder and the contact A step of covering a tree with a pattern sheet having a pattern on the outer surface and a plurality of strings on the inner surface with the inner surface facing inward, and the outer cylinder covered with the mold sheet in a bottomed sand mold And a step of filling the space provided between the outer peripheral surface of the outer cylinder, the mold sheet and the sand mold frame with sand, and solidifying and transferring the pattern of the mold sheet to the sand; Removing the tree and removing the outer cylinder from the mold sheet; removing the mold sheet; and installing a cylindrical inner mold at the center of the interior after laying bottom sand on the bottom of the sand mold frame, Cylindrical, with a plurality of windows and wings alternately in the mid-abdomen, and an inner cylinder A step of installing a cylindrical reinforcing bar between the sand to which the pattern is transferred and the inner cylinder, and a part of the mortar is poured into the inner cylinder from the upper end opening of the inner cylinder. Before the mortar is hardened by flowing out from the window to the outside of the inner cylinder, raising the inner mold by the thickness of the bottom, and flowing the mortar into the bottom of the inner mold, and an upper end opening of the inner cylinder The remainder of the mortar is poured into the inner cylinder from the window and flows out from the window to the outside of the inner cylinder, and the inner cylinder is rotated and the mortar is agitated with the wings and the inner wing while gradually raising the mortar to the upper end of the sand mold It was set as the structure of the manufacturing method of the concrete pillar characterized by including the process of filling a mortar until, and the process of extracting mortar from a sand mold after the filled mortar hardens | cures.

  In addition, the concrete column manufacturing method is characterized in that an inner wing having the same shape as the wing is provided in the inner cylinder at the position of the wing.

  The wing is fixed between the window and the window obliquely with respect to the longitudinal direction of the inner cylinder.

  Further, in the step of removing the mold sheet, a pulling tool having a locking part for locking the string is inserted inside the mold sheet, the string is locked to the locking part, and the pulling tool is It was set as the structure of the manufacturing method of the concrete pillar characterized by setting it as the process of removing the said type | mold sheet | seat by drawing out.

  In addition, the structure is a concrete column manufacturing method characterized in that the pattern is a pseudo tree imitating a bark.

  Since this invention is the above structures, even if it is a concrete pillar with a complicated shape and pattern, it can be manufactured easily.

  Moreover, since the formwork is made of sand, it is possible to cope with a design change with less cost and time than before.

  Moreover, since a reinforcing bar is provided inside, a concrete column that is stronger than before can be manufactured.

It is the figure which showed the member used with the manufacturing method of the concrete pillar which is this invention. It is a perspective view which shows the 1st manufacturing process of the concrete pillar which is this invention. It is a perspective view which shows the 2nd manufacturing process of the concrete pillar which is this invention. It is a perspective view which shows the 3rd manufacturing process of the concrete pillar which is this invention. It is a top view which shows the 3rd manufacturing process of the concrete pillar which is this invention. It is a top view which shows the 4th manufacturing process of the concrete pillar which is this invention. It is a top view which shows the 5th manufacturing process of the concrete pillar which is this invention. It is a partial cross section figure which shows the 6th manufacturing process of the concrete pillar which is this invention. It is a top view which shows the 6th manufacturing process of the concrete pillar which is this invention. It is sectional drawing which shows the 7th manufacturing process of the concrete pillar which is this invention. It is sectional drawing which shows the 8th process drawing of the concrete pillar which is this invention. It is a completion figure of the concrete pillar which is this invention. It is the figure which showed the member used with 2nd Example of the manufacturing method of the concrete pillar which is this invention. It is a top view of the inner cylinder used in 2nd Example of the manufacturing method of the concrete pillar which is this invention. It is a perspective view which shows the 3rd manufacturing process of 2nd Example of the manufacturing method of the concrete pillar which is this invention. It is sectional drawing which shows the 6th manufacturing process of 2nd Example of the manufacturing method of the concrete pillar which is this invention. It is a top view which shows the 6th manufacturing process of 2nd Example of the manufacturing method of the concrete pillar which is this invention. It is sectional drawing which shows the 7th manufacturing process of 2nd Example of the manufacturing method of the concrete pillar which is this invention. It is sectional drawing which shows the 8th manufacturing process of 2nd Example of the manufacturing method of the concrete pillar which is this invention. It is sectional drawing and the completion figure which show the 9th manufacturing process of 2nd Example of the manufacturing method of the concrete pillar which is this invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  First, the first embodiment of the method for manufacturing a concrete column according to the present invention will be described with reference to FIGS.

  FIG. 1 is a view showing members used in the method for producing a concrete pillar according to the present invention. As shown in FIG. 1, in the method for manufacturing a concrete pillar according to the present invention, a sand mold 2, an outer cylinder 3, an inner cylinder 4, a reinforcing bar 5, a wood 6 and a mold sheet 7 are used.

  The sand mold 2 is a mold used for forming a mold having an outer shape of the concrete pillar 1 and is cylindrical and has an insertion hole 2a in the center of the bottom surface. In FIG. 1, the shape of the sand mold 2 is cylindrical, but is not particularly limited, and may be prismatic or the like.

  A leak stopper 2b is attached to the center of the bottom surface of the bottom surface of the sand mold 2, and a hole having the same diameter as the insertion hole 2a is also formed in the leak stopper 2b. The insertion hole 2a and the leak-proof hole are overlapped at the same position. The leak stopper 2b is preferably made of a resilient material such as rubber or urethane, but the material is not particularly limited.

  The outer cylinder 3 has a cylindrical shape and is a member installed in the sand mold 2. In FIG. 1, the shape of the outer cylinder 3 is a columnar shape, but is not particularly limited, and may be a prismatic shape as long as it has a cylindrical shape. Since the outer cylinder 3 is embedded in the sand mold 2 after being installed in the sand mold 2, and the outer cylinder 3 is removed from the sand to form a sand mold, the shape of the outer cylinder 3 affects the outer shape of the concrete column. As shown in FIG. 1, a cylindrical concrete column can be manufactured by making the outer cylinder 3 cylindrical, and a prismatic concrete column can be manufactured by making the outer cylinder 3 rectangular.

  The inner cylinder 4 is a cylindrical member that is installed in the sand mold after the sand mold is made with the outer cylinder 3 described above, and the outer diameter of the inner cylinder 4 is the perforation hole 2 of the sand mold 2. Is almost equal to the diameter of However, since the inner cylinder 4 is rotated after being inserted into the perforation hole 2, the diameter of the perforation hole 2 must be larger than the outer diameter of the inner cylinder 4.

  As shown in FIG. 1, the inner cylinder 4 is provided with a plurality of windows 4a and wings 4b alternately in the middle of the abdomen. I have. Further, a coating 4d is provided on the outer peripheral surface of the inner cylinder 4. The coating 4d is preferably a thick cloth, but is not particularly limited, and may be a newspaper or the like.

  As described above, the wing 4b is formed between the window 4a and the other window 4a. One end of the wing 4b is located near the lower part of one window 4a and the other end is located near the upper end of the other window 4a. It is preferable that the wing 4b is formed so as to be fixed to the window 4a and the window 4a obliquely with respect to the longitudinal direction of the inner cylinder 4 so as to be positioned at the position. By forming each wing 4b in this manner, the inner cylinder 4 can be easily rotated even when the mortar is filled in the periphery, and the mortar can be effectively stirred by the wing 4b, and an air layer is formed in the mortar. Mortar can be filled without making it.

  The rebar 5 is a rebar knitted in a cylindrical shape, and as shown in FIG. 1, a plurality of annular rebars having the same diameter and the same size are arranged at equal intervals in the vertical direction and welded by a plurality of vertical bars. May be.

  The reinforcing bar 5 is a reinforcing bar installed in the sand mold 2 so as to surround the inner cylinder 4 after the inner cylinder 4 is installed in the sand mold 2 and before the mortar filling. It is a member for.

  The shape of the reinforcing bar 5 may be a cylindrical shape and is not limited to a cylindrical shape as shown in FIG. For example, when the outer cylinder 3 has a prismatic shape, a reinforcing bar formed in a prismatic shape may be used.

  The tree 6 is a member attached to the outer surface of the outer cylinder 3, and is preferably slightly longer than the height of the outer cylinder 3. In addition, although the wood 6 is planned to be wooden, it is not particularly limited and may be a member made of plastic or the like.

  The mold sheet 7 is a sheet that covers the outer cylinder 3 and the tree 6 at a time after arranging a plurality of trees 3 on the outer surface of the outer cylinder 3, and has an uneven pattern 7a on the outer surface. A plurality of strings 7b are attached to the inner surface. In addition, the said pattern 7a was made into the pattern showing a bark.

  The mold sheet 7 is preferably a material having a thickness, stretchability, and durability, such as silicon rubber. However, the material of the mold sheet 7 is not limited.

  Next, a method for manufacturing a concrete column will be described with reference to FIGS. In Example 1, the shape of the concrete pillar was a pseudo tree.

  FIG. 2 is a perspective view showing the first manufacturing process of the concrete pillar. First, a plurality of trees 6, 6, 6... Are arranged on the outer surface of the cylindrical outer cylinder 3, and then the outer cylinder 3 and trees 6, 6, 6. 7 to make a mold to be buried in the sand 8.

  When collectively covering with the mold sheet 7, care should be taken that the pattern 7a surface of the mold sheet 7 is on the outside and the surface on which the string 7b is attached is on the inside.

  FIG. 3 is a perspective view showing a second manufacturing process of the concrete pillar. Next, as shown in FIG. 3, the outer cylinder 3 covered with the mold sheet 7 is installed in the center of the sand mold 2.

  FIG. 4 is a perspective view showing a third manufacturing process of the concrete pillar, and FIG. 5 is a plan view showing the third manufacturing process of the concrete pillar. After installing the outer cylinder 3 in the sand mold 2 as described above, the space formed between the mold sheet 7 and the sand mold 2 is filled with sand 8 as shown in FIGS. The pattern 7a on the outer surface of the mold sheet 7 is transferred to the sand 8 by solidifying firmly.

  FIG. 6 is a plan view showing a fourth manufacturing process of the concrete pillar. After the sand 8 is firmly solidified until the pattern 7a is transferred to the sand 8, the trees 6, 6, 6... Are pulled out, and the outer cylinder 3 is removed from the sand mold 2 as shown in FIG. As shown, in the sand mold 2, the hardened sand 8 and the mold sheet 7 attached to the inner wall surface of the sand 8 remain.

  FIG. 7 is a plan view showing a fifth manufacturing process of the concrete pillar. Next, as shown in FIG. 7, the mold sheet 7 remaining in the sand mold 2 is removed using a rod-shaped extraction tool 9 provided with a locking portion 9 a.

  As described above, a plurality of strings 7b are attached to the inner surface of the mold sheet 7, and as shown in FIG. 7, a locking portion 9a for locking the strings 7b is provided inside the mold sheet 7. The mold sheet 7 can be removed by inserting the pulling tool 9, locking the string 7 b to the locking portion 9 a, and pulling out the pulling tool 9. When the extraction tool 9 is pulled out as described above, the mold sheet 7 is peeled off from the sand 8 while being pulled toward the center, and only the sand 8 to which the pattern 7a is transferred remains in the sand mold frame 2.

  FIG. 8 is a partial cross-sectional view showing the sixth manufacturing process of the concrete pillar, and FIG. 9 is a plan view showing the sixth manufacturing process of the concrete pillar. After making the sand mold as described above, the inner cylinder 4 is first installed in the sand mold 2 as shown in FIG. At this time, the inner cylinder 4 is inserted into the sand mold 2 so as not to touch the sand 8 mold, and the lower side of the inner cylinder wing 4b is inserted into the insertion hole 2a until the wing 4a contacts the bottom surface of the sand mold 2. To penetrate.

  Then, the reinforcing bars 5 are installed in the sand mold 2 so as to surround the inner cylinder 4. At this time, the rebar 5 is installed with care so as not to touch the sand 8 mold. In addition, as shown in FIG. 9, each wing | blade 4a of the said inner cylinder 4 is all located in the reinforcing bar 5, ie, the internal diameter of the reinforcing bar 5 is larger than the outer diameter which each wing | blade 4a can make.

  FIG. 10 is a cross-sectional view showing a seventh manufacturing process of a concrete pillar. As described above, after the inner cylinder 4 and the reinforcing bar 5 are installed inside the sand mold 2 (a mold made of sand 8), the mortar 10 is poured into the inner cylinder 4 as shown in FIG.

  The mortar 10 poured into the inner cylinder 4 flows out of the inner cylinder 4 from each window 4 a provided in the middle of the inner cylinder 4 and is filled between the inner cylinder 4 and the sand 8 mold. The mortar 10 is poured into the inner cylinder 4 so that the mortar 10 always flows out of the inner cylinder 4 and is pulled upward while rotating the inner cylinder 4.

  The mortar 10 flowing out from the inner cylinder 4 is stirred by the wings 4b of the inner cylinder 4 and pushed outward, so that the space between the inner cylinder 4 and the mold of the sand 8 is filled with the mortar 10 without a gap.

FIG. 11 is a cross-sectional view showing an eighth process drawing of a concrete pillar. As described above, while the inner cylinder 4 is rotated and pulled up, the mortar 10 is filled until the reinforcing bar 5 is hidden. When the mortar 10 is solidified, the inner cylinder 4 is pulled out from the mortar 10 as shown in FIG.

  FIG. 12 is a completed view of the concrete pillar according to the present invention. When the sand 8 mold is finally removed through the steps shown in FIGS. 2 to 11 and the mortar 10 is taken out from the sand mold 2, the strong hollow 10b in which the reinforcing bars 5 are embedded as shown in FIG. Concrete pseudo-tree 1 is completed. In addition, the code | symbol 10a is the pattern made of the unevenness | corrugation transferred to the type | mold of the sand 8 on the surface of the pseudo tree 1 made from concrete. As described above, since the pattern 7a of the mold sheet 7 is made of wood, the surface of the finished concrete pillar has irregularities like wood and the pseudo tree is completed.

From the above, the method for producing a concrete column according to the present invention is a method for producing a hollow concrete column that has a pattern on the outer surface and is reinforced with a reinforcing bar,
A mold sheet in which a plurality of trees 6 are arranged on the outer surface of a cylindrical outer cylinder 3, and the outer cylinder 3 and the trees 6 are provided with a pattern on the outer surface and provided with a plurality of strings 7b on the inner surface. A process of covering the inner surface with the inner surface at 7;
Installing the outer cylinder 3 covered with the mold sheet 7 in a sand mold 2 having an insertion hole 2a smaller than the outer diameter of the outer cylinder in the center of the bottom;
Filling the space provided between the mold sheet and the sand mold 2 with sand 8 and solidifying and transferring the pattern of the mold sheet 7 to the sand 8;
Removing the wood 6 and extracting the outer cylinder 3 from the mold sheet 7;
Removing the mold sheet 7;
An inner cylinder 4 that is cylindrical and includes a plurality of windows 4a and a plurality of wings 4b alternately in the middle of the abdomen, and includes a middle plate 4c that divides the inside up and down at the bottom position of the inside of the window 4a. A step of installing a cylindrical reinforcing bar 5 between the sand transferred with the pattern and the inner cylinder 4 after being installed in the insertion hole 2a.
The mortar 10 is poured into the inner cylinder 4 from the upper end opening of the inner cylinder 4 and flows out from the window 4a to the outside of the inner cylinder 4, and the inner cylinder 4 is rotated and gradually stirred while the mortar is stirred by the blades 4b. A step of pulling up to the top and filling the mortar 10 to the upper end of the sand mold 2;
And the step of extracting the mortar 10 from the sand mold 2 after the filled mortar 10 is cured.

  Next, a second embodiment of the concrete column manufacturing method according to the present invention will be described with reference to FIGS.

  FIG. 13 is a view showing members used in the second embodiment of the concrete column manufacturing method of the present invention, and FIG. 14 is a plan view of the inner cylinder used in the second embodiment of the concrete column manufacturing method. As shown in FIG. 13, in the second embodiment of the method for manufacturing a concrete pillar according to the present invention, the sand mold 11, the outer cylinder 3, the inner cylinder 12, the inner mold 13, the reinforcing bar 5, the wood 6 and the mold sheet 7. Is used.

  About the said outer cylinder 3, the reinforcing bar 5, the tree 6 and the type | mold sheet | seat 7, since it is the same as what was used in Example 1, description is abbreviate | omitted.

  The sand mold 11 is a mold used for forming a mold having an outer shape of a concrete pillar, and is cylindrical and has a bottom 11a. In FIG. 13, the shape of the sand mold 11 is cylindrical. However, the shape is not particularly limited, and may be prismatic or the like.

The inner cylinder 12 is a cylindrical member installed in the sand mold after the sand mold is made with the outer cylinder 3, and has a plurality of windows 12a and wings 12b alternately on the lower outer surface. As shown in FIG. 14, an inner wing 12c having the same shape as the wing 12b is provided in the inner cylinder 12 at the position of the wing 12b.

  As described above, the wing 12b is formed between the window 12a and the other window 12a. One end of the wing 12b is located near the lower part of one window 12a and the other end is near the upper end of the other window 12a. The wing 12b is formed on the outer surface of the inner cylinder 12 so as to be positioned at an angle with respect to the longitudinal direction of the inner cylinder 12, and fixed between the window 12a and the window 12a. It is preferable that 12c is formed on the inner wall surface of the inner cylinder 12 so as to be inclined between the window 12a and the window 12a at an angle with respect to the longitudinal direction of the inner cylinder 12. By forming each wing 12b in this way, the inner cylinder 12 can be easily rotated even when the mortar is filled in the periphery, and the mortar can be effectively stirred by the wing 12b and the inner wing 12c. The mortar can be filled without creating an air layer.

  The inner mold 13 has a columnar shape and is not cylindrical. In the inner mold 13 shown in FIG. 13, the cylindrical cylinder is filled with the mortar 13a and hardened, but the inner cylinder 13 is not particularly limited. The inner cylinder 13 is not hollow and has a heavy column shape. If it is. Further, the outer surface of the inner mold 13 is coated, and a thick cloth is suitable for the coating, but it is not particularly limited, and newspaper or the like may be used.

  Next, the manufacturing method of a concrete pillar is demonstrated using FIGS. 15-20. In Example 2, the shape of the concrete pillar was a pseudo tree.

  FIG. 15 is a perspective view showing a third manufacturing process of the second embodiment of the method for manufacturing a concrete pillar. The first to fifth steps of the second embodiment including the third manufacturing step of FIG. 15 are the same as the steps shown in the first embodiment.

  That is, as shown in FIG. 2, a plurality of trees 6, 6, 6... Are arranged on the outer surface of the cylindrical outer cylinder 3, and then the outer cylinder 3 and trees 6, 6, 6 ... are collectively covered with the mold sheet 7 to make a mold embedded in the sand 8. (When collectively covering with the mold sheet 7, care should be taken that the pattern 7a surface of the mold sheet 7 is on the outside and the surface on which the string 7b is attached is on the inside.)

  Next, as shown in FIG. 3, the outer cylinder 3 covered with the mold sheet 7 is installed in the center of the sand mold 11, and as shown in FIGS. 4 and 15, the outer cylinder 3 is formed between the mold sheet 7 and the sand mold 11. The space 8 is filled with sand 8, the sand 8 is solidified, and the pattern 7 a on the outer surface of the mold sheet 7 is transferred to the sand 8.

  Then, after the sand 8 is firmly hardened until the pattern 7a is transferred to the sand 8, the trees 6, 6, 6... Are pulled out, and the outer cylinder 3 is removed from the sand mold 11 to 6, the sand 8 solidified in the sand mold 11 and the mold sheet 7 attached to the inner wall surface of the sand 8 remain.

  Then, as shown in FIG. 7, the mold sheet 7 remaining in the sand mold 11 is removed using a rod-shaped extraction tool 9 having a locking portion 9 a. (A plurality of strings 7b are attached to the inner surface of the mold sheet 7. As shown in FIG. 7, when the strings 7b are hooked on the engaging portions 9a and the pulling tool 9 is slowly pulled up, the mold sheet 7 Is pulled away from the sand 8 while being drawn to the center, and only the sand 8 having the pattern 7a transferred in the sand mold 2 remains.)

  FIG. 16 is a cross-sectional view showing a sixth manufacturing process of the second embodiment of the concrete column manufacturing method, and FIG. 17 is a plan view showing the sixth manufacturing process. As described above, after making the sand mold through the first manufacturing process to the fifth manufacturing process as in the first embodiment, first, as shown in FIGS. 8a is spread to make the sand 8 mold bottom, the inner mold 13 is placed in the center of the sand mold 11, and then the inner cylinder 12 is installed in the sand 8 mold so as to surround the inner mold 11. . Finally, the reinforcing bars 5 are installed in the mold of the sand 8 so as to surround the inner cylinder 12. At this time, the inner mold 13, the inner cylinder 12 and the reinforcing bar 5 are installed in the sand mold 11 so as not to touch the inner wall surface of the sand 8 mold. In addition, as shown in FIG. 17, each wing | blade 12a of the said inner cylinder 12 is all located in the reinforcing bar 5, ie, the internal diameter of the reinforcing bar 5 is larger than the outer diameter which each wing | blade 12a can make.

  FIG. 18 is a sectional view showing a seventh manufacturing process of the second embodiment of the method for manufacturing a concrete pillar. As described above, after the inner mold 13, the inner cylinder 12 and the reinforcing bar 5 are installed inside the sand mold 11 (mold made of sand 8), a small amount of mortar is placed in the inner cylinder 12 as shown in FIG. 10 is poured.

  A small amount of the mortar 10 poured into the inner cylinder 12 flows down the space formed by the inner wall surface of the inner cylinder 12 and the inner mold 13, and passes outward from the windows 12 a provided at the lower part of the inner cylinder 12. It flows out and is filled between the mold of the inner cylinder 12 and the sand 8.

  At this time, the inner mold 13 is pulled up by the height of the bottom provided on the concrete pillar, and then the inner cylinder 12 is rotated while the same height is raised to fill the lower side of the inner mold 13 with the mortar 10. To do.

  The inner mold 13 does not sink because the mortar 10 is filled on the lower side, and the inner mold 13 is not hollow and has a heavy column shape as described above, so that it floats even if the mortar is filled afterwards. Nor.

  FIG. 19: is sectional drawing which shows the 8th manufacturing process of 2nd Example of the manufacturing method of a concrete pillar. The remaining mortar 10 is poured into the inner cylinder 12 through the seventh manufacturing process of FIG. At this time, the mortar 10 is poured into the inner cylinder 12 so that the mortar 10 always flows out from the lower end of the inner cylinder 12 and the window 12a, and is pulled upward while rotating the inner cylinder 12.

  The mortar 10 that has flowed out of the inner cylinder 12 is agitated by the wings 12b outside the inner cylinder 12 and pushed outward, so that the space between the inner cylinder 12 and the sand 8 mold is filled with no gap. Since the inner cylinder 12 is agitated by the inner wing 12c and pushed inward, the space between the inner cylinder 12 and the inner mold 13 is filled with the mortar 10 without a gap.

  FIG. 20 is a sectional view and a completed view showing a ninth manufacturing process of the second embodiment of the method for manufacturing a concrete pillar. As described above, while the inner cylinder 12 is rotated and pulled up, the mortar 10 is filled until the reinforcing bar 5 is hidden, and when the inner cylinder 12 is removed as it is, the inner mold 13 remains in the center as shown in the left figure of FIG. It becomes a state.

  Then, after the mortar 10 is hardened, the inner mold 13 is pulled out from the mortar 10, the sand 8 around the hardened mortar 10 is removed, and the mortar 10 is taken out from the sand mold 11 as shown in the right figure of FIG. The bottomed strong concrete pseudo-tree 1a with the reinforcing bars 5 embedded therein is completed.

From the above, the method for producing a concrete column according to the present invention is as follows.
A method for producing a bottomed hollow concrete column with a pattern on the outer surface and reinforced with reinforcing bars,
A mold sheet in which a plurality of trees 6 are arranged on the outer surface of a cylindrical outer cylinder 3, and the outer cylinder 3 and the trees 6 are provided with a pattern on the outer surface and provided with a plurality of strings 7b on the inner surface. A process of covering the inner surface with the inner surface at 7;
Installing the outer cylinder 3 covered with the mold sheet 7 in a bottomed sand mold 11;
Filling the space provided between the outer peripheral surface of the outer cylinder 3 and the mold sheet and the sand mold 2 with sand 8 and solidifying and transferring the pattern of the mold sheet 7 to the sand 8;
Removing the wood 6 and extracting the outer cylinder 3 from the mold sheet 7;
Removing the mold sheet 7;
The bottom sand 8a is laid down on the bottom 11a of the sand mold 11, and a columnar inner mold 13 is installed at the center of the inside. The cylinder is alternately provided with a plurality of windows 12a and a plurality of wings 12b in the middle part thereof. Placing the inner cylinder 12 between the sand to which the pattern has been transferred and the inner mold 13, and then installing the cylindrical reinforcing bar 5 between the sand 8 to which the pattern has been transferred and the inner cylinder 12,
A part of the mortar 10 is poured into the inner cylinder 12 from the upper end opening of the inner cylinder 12 and flows out from the window 12a to the outside of the inner cylinder 12 to harden the inner mold 13 before the mortar 10 is cured. Raising the bottom thickness and allowing the mortar 10 to flow into the bottom of the inner mold 13;
The remainder of the mortar 10 is poured into the inner cylinder 12 from the upper end opening of the inner cylinder 12, flows out from the window 12a to the outside of the inner cylinder 12, and the inner cylinder 12 is rotated to mortar between the wings 12b and the inner wings 12c. Step of gradually pulling up to the top while stirring and filling the mortar 10 to the upper end of the sand mold 11;
And the step of extracting the mortar 10 from the sand mold 2 after the filled mortar 10 is cured.

  In the conventional manufacturing method, the formwork could not be removed for several days until the mortar hardened, and several expensive formwork had to be prepared to increase the production quantity. In the present invention, only the sand mold 2 (11) and the inner cylinder 4 (12) (in the case of the bottom, the inner mold 13 in addition to the sand mold and the inner cylinder) are necessary for curing the mortar. Since it is a simple and inexpensive member, it can be easily procured and production can be resumed.

  In addition, the conventional manufacturing method requires cleaning of the mortar attached to the pattern, and a process such as application of a release agent for reducing adhesion of the mortar and repair of air traces are necessary. No process is required.

  In construction terms, the loss of air marks is called a jumper, and a vibrator is used to prevent this jumper. However, it is difficult to prevent the jumper, and most of the convex portions where air easily accumulates are in a defective state. In the present invention, even when mortar is poured in a sloppy manner, no jumper has been generated, and it can be seen that the manufacturing work is simpler than before and the resulting concrete column is also sturdy.

  The method for producing a concrete pillar according to the present invention uses a sand mold, so that even a concrete pillar having a complicated outer shape or pattern can be easily produced, and the outer shape mold can be obtained without much cost and time. The finished concrete pillars are reinforced with wire mesh and are strong, which makes a great contribution to the exterior industry.

DESCRIPTION OF SYMBOLS 1 Concrete imitation tree 1a Concrete imitation tree 2 Sand mold frame 2a Insertion hole 2b Leak stopper 3 Outer cylinder 4 Inner cylinder 4a Window 4b Wing 4c Middle plate 4d Covering 5 Reinforcement 6 Toki 7 Type sheet 7a Pattern 7b String 8 Sand 8a Bottom sand 9 Pull-out tool 9a Locking part 10 Mortar 10a Pattern 10b Hollow 11 Sand mold 11a Bottom 12 Inner cylinder 12a Window 12b Feather 12c Inner feather 13 Inner mold 13a Mortar

Claims (6)

A method of manufacturing a hollow concrete column with a pattern on the outer surface and reinforced with reinforcing bars,
A plurality of trees are arranged on the outer surface of a cylindrical outer cylinder, and the inner surface is arranged on the inner surface with a mold sheet having a pattern on the outer surface and a plurality of strings on the inner surface. And batch coating process,
Installing the outer cylinder covered with the mold sheet in a sand mold with an insertion hole smaller than the outer diameter of the outer cylinder at the bottom center;
Filling the space provided between the mold sheet and the sand mold frame with sand, solidifying and transferring the pattern of the mold sheet to the sand;
Removing the tree and extracting the outer cylinder from the mold sheet;
Removing the mold sheet;
A cylindrical inner tube with a plurality of windows and a plurality of wings provided alternately in the middle abdomen, and an inner cylinder provided with a middle plate that divides the interior vertically into the bottom position of the window, was installed in the insertion hole of the sand mold Above, a step of installing a cylindrical reinforcing bar between the sand and the inner cylinder to which the pattern is transferred,
The mortar is poured into the inner cylinder from the upper end opening of the inner cylinder and flows out from the window to the outside of the inner cylinder. Filling the mortar to the top of the
Extracting the mortar from the sand mold after the filled mortar has hardened;
The manufacturing method of the concrete pillar characterized by consisting of. A method for producing a bottomed hollow concrete column with a pattern on the outer surface and reinforced with reinforcing bars,
A plurality of trees are arranged on the outer surface of a cylindrical outer cylinder, and the inner surface is arranged on the inner surface with a mold sheet having a pattern on the outer surface and a plurality of strings on the inner surface. And batch coating process,
Installing the outer cylinder covered with the mold sheet in a sand mold with a bottom;
Filling the space provided between the outer peripheral surface of the outer cylinder and the mold sheet and the sand mold, and solidifying and transferring the pattern of the mold sheet to the sand;
Removing the tree and extracting the outer cylinder from the mold sheet;
Removing the mold sheet;
After placing the bottom sand on the bottom of the sand mold frame, a cylindrical inner mold is installed in the center of the inside, and it is cylindrical and is provided with a plurality of windows and a plurality of wings alternately in the middle abdomen. A step of placing a cylindrical reinforcing bar between the sand and the inner cylinder to which the pattern has been transferred, after being placed between the transferred sand and the inner mold;
A part of the mortar is poured into the inner cylinder from the upper end opening of the inner cylinder and flows out from the window to the outside of the inner cylinder, and the inner mold is raised by the thickness of the bottom before the mortar is cured. Flowing mortar into the bottom of the inner mold,
The remainder of the mortar is poured into the inner cylinder from the upper end opening of the inner cylinder and flows out from the window to the outside of the inner cylinder, and the inner cylinder is rotated, and the mortar is stirred gradually with the wings and the inner wing while gradually moving upward. Pulling up and filling the mortar to the top of the sand mold,
Extracting the mortar from the sand mold after the filled mortar has hardened;
The manufacturing method of the concrete pillar characterized by consisting of. The method for manufacturing a concrete pillar according to claim 2, wherein an inner wing having the same shape as the wing is provided in the inner cylinder at the position of the wing. The method for producing a concrete pillar according to any one of claims 1 to 3, wherein the wing is fixed between the window and the window obliquely with respect to the longitudinal direction of the inner cylinder. The step of removing the mold sheet is performed by inserting a pulling tool having a locking part for locking the string inside the mold sheet, locking the string to the locking part, and pulling out the pulling tool. The method for producing a concrete pillar according to any one of claims 1 to 4, wherein the mold sheet is removed. The method for producing a concrete pillar according to any one of claims 1 to 5, wherein the pattern is a pseudo-tree simulating a bark.

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