JP6595404B2 - Steel tower foundation concrete form and steel tower foundation concrete construction method - Google Patents

Description

  The present invention relates to a steel tower foundation concrete form and a steel tower foundation concrete construction method.

  Conventionally, when placing the power line foundation concrete, after placing the base concrete and providing the base part A, the column body formwork is installed on the base, and the concrete is put into the column body formwork. A column body was provided. However, since impurities may be mixed in the joint portion between the base portion A and the column body portion, the base portion A and the base portion of the column body portion are simultaneously placed into the concrete for the purpose of avoiding the joint structure. The technique to install is developed (for example, refer patent document 1).

Japanese Patent Laid-Open No. 11-61853

  However, conventionally, the base part A and the columnar part are placed on separate days in order to place the columnar part after the base part A is cured and solidified. Even in the technique shown in Patent Document 1, after placing the base portion A and the base portion of the column body portion into the concrete at the same time, the upper formwork of the column body portion is loaded and the concrete is placed on the upper portion of the column body portion. The foundation and upper part of the column are placed on different days.

  For this reason, the curing period of the base part A or the base part A and the base part of the column body part was required, and there was a problem that the construction took days. Also, when carrying concrete with a helicopter at the site in a mountainous area, it is often necessary to cancel the work due to bad weather, etc., or to change the work process, thereby increasing various expenses such as arranging a helicopter There was a problem.

  This invention was made paying attention to such a subject, and it aims at providing the steel tower foundation concrete formwork and the steel tower foundation concrete construction method which can aim at shortening of a construction period and cost reduction.

  In order to achieve the above object, a steel tower foundation concrete mold according to the present invention is a steel tower foundation concrete mold provided at the bottom of a main leg extending in the vertical direction with the lower end portion arranged at the bottom of a hole for foundation installation. A frame support base provided at the bottom of the foundation mounting hole so as to surround a lower end portion of the main leg member; and a main frame member provided so as to surround the main leg member at an upper portion of the mold base support. A lid member that is supported by a columnar formwork, an upper portion of the formwork support and an inner wall portion of the foundation installation hole, and closes the foundation installation hole between the upper portion of the formwork support and the inner wall portion. It is characterized by having.

The steel tower foundation concrete construction method according to the present invention includes a step of forming a hole for foundation installation, a lower end portion of a main leg material disposed at the bottom of the hole for foundation installation, and the main leg material is installed to extend in a vertical direction. A step of installing a formwork stand at the bottom of the foundation installation hole so as to surround a lower end portion of the main leg member, and a column surrounding the main leg member at an upper portion of the formwork stand. A step of providing a body frame, a lid material supported by an upper part of the mold frame support base and an inner wall portion of the foundation installation hole, a concrete placement opening is opened, and the upper part of the mold frame support base is formed by the lid material. A step of closing the foundation installation hole between the inner wall portion, a step of placing concrete from the concrete placement opening to the height of the lid member in the foundation installation hole, and And a step of placing concrete inside. .
After the cast concrete is solidified, the lid member and the column form are removed from the cast concrete.

  In the steel tower foundation concrete formwork and steel tower foundation concrete construction method according to the present invention, the lid material closes the foundation installation hole between the upper part of the formwork cradle and the inner wall part, and the columnar mold is formed on the upper part of the formwork cradle. Since the frame is provided, the concrete can be placed inside the columnar formwork immediately after the concrete is placed up to the height of the lid material inside the hole for foundation installation. For this reason, since it is not necessary to wait for solidification of the base part A for the concrete placement of the columnar part, the construction period can be shortened.

  In addition, when carrying concrete with a helicopter on the site in a mountainous area, it is possible to perform concrete placement in the base part A and concrete placement in the column body at one time, so air transportation by helicopter The number of times can be reduced and the cost can be reduced.

In the steel tower foundation concrete form according to the present invention, it is preferable that the lid member is formed by detachably connecting a plurality of divided lids in the lateral direction, and each divided lid has a plurality of water passage holes.
In this case, it is possible to remove the optional divided lid and provide a concrete placement opening to facilitate the placement of the concrete into the foundation installation hole. In addition, the lid material can be easily transported by dividing the lid material into a plurality of divided lids. Since the plurality of divided lids are detachably connected, it is easy to remove and reuse after the base portion A is formed. Since each divided lid has a plurality of water passage holes, water / air can be escaped from the water holes during curing of the concrete of the base portion A. It is also possible to confirm the concrete placement condition of the base part A from the water passage hole.
It is preferable that the lid member has a strength that allows an operator to work on the lid member. It is preferable that the division | segmentation lid | cover which has a water flow hole consists of punching metal.

The formwork for steel tower foundation concrete according to the present invention has a lid fixing member, the foundation installation hole has a liner plate on an inner wall portion, the liner plate has a flange-like seam on the inner periphery, It is preferable that the lid fixing member has an upper end attachment portion that is detachably attached to the joint at the upper end, and a lower end attachment portion that is detachably attached to the lid member at the lower end.
In this case, the lid member can be secured to the liner plate on the inner wall portion of the foundation installation hole by the lid fixing member. For this reason, fixation of a cover material can be ensured. The lid fixing member can be removed from the liner plate and the lid member and reused.

In the formwork for steel tower foundation concrete according to the present invention, the formwork stand has three or more legs and a support frame, and the height of the support frame is adjustable and detachable at the upper part of each leg. It is attached, and it is preferred that the pillar form frame is detachably attached to the support frame.
In this case, the support frame can be adjusted to be horizontal by adjusting the height of the position of each leg.

  ADVANTAGE OF THE INVENTION According to this invention, the formwork for steel tower foundation concrete and the steel tower foundation concrete construction method which can aim at shortening of a construction period and cost reduction can be provided.

It is sectional drawing which shows the use condition of the steel tower foundation concrete formwork of embodiment of this invention. It is a perspective view which shows the installation / bar arrangement process of the main leg material of a steel tower foundation concrete construction method of embodiment of this invention, and a brazing material. (A) A perspective view of a leg portion of a formwork cradle used for a steel tower foundation concrete form according to an embodiment of the present invention, (B) a perspective view of a support frame of the formwork cradle, and (C) a lid material It is a perspective view, (D) The top view of the division | segmentation lid | cover which comprises a cover material, (E) The front view of a lid | cover fixing member. It is a perspective view which shows the assembly and installation process of the formwork stand of the steel tower foundation concrete construction method of embodiment of this invention. It is a perspective view which shows the installation process of the lowest step of the column formwork of the steel tower foundation concrete construction method of embodiment of this invention. It is sectional drawing which shows the fixed state of the support frame of the form support stand of the tower foundation concrete form of the embodiment of this invention, and a column body formwork. It is a perspective view which shows the installation process of the upper stage of the column-form frame of the steel tower foundation concrete construction method of embodiment of this invention. It is a perspective view which shows the attachment process of the cover material of the steel tower foundation concrete construction method of embodiment of this invention. It is a perspective view which shows the process of attaching a cover fixing member to the cover material of the steel tower foundation concrete construction method of embodiment of this invention. It is sectional drawing which shows the use condition of the cover fixing member of the steel tower foundation concrete formwork of embodiment of this invention. It is a perspective view which shows the concrete placement process of the base part A of the steel tower foundation concrete construction method of embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS (A) The perspective view which shows the concrete placement process of the pillar part of the steel tower foundation concrete construction method of embodiment of this invention, (B) It is sectional drawing which shows the compaction state at the time of concrete placement of a pillar part . It is sectional drawing which shows the deframed completion state by the steel tower foundation concrete construction method of embodiment of this invention. It is sectional drawing which shows a part of base part A of the steel tower foundation concrete constructed | assembled by the steel tower foundation concrete construction method of embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, when building a power transmission tower foundation concrete, first, a foundation installation hole 1 is formed. The base installation hole 1 includes a cylindrical base portion accommodating portion 1a and a cylindrical columnar frame accommodating portion 1b. The diameter of the columnar frame accommodating portion 1b is larger than the base portion accommodating portion 1a. A liner plate 2 is provided on the inner wall portion of the columnar mold housing portion 1b. The liner plate 2 has a plurality of flange-shaped seams 2a on the inner periphery at intervals in the height direction.

  As shown in FIG. 2, the lower end portion of the main leg member 3 is disposed at the bottom of the foundation installation hole 1, and the main leg member 3 is installed so as to extend in the vertical direction. Two ribs 4 made of angle steel are arranged in a T shape at the lower end of the main leg 3 and fixed with bolts. Reinforcing bars 5 are provided around the main leg 3 at intervals.

  The steel tower foundation concrete form is installed in the hole 1 for foundation installation. As shown in FIGS. 3 and 7, the steel tower foundation concrete formwork includes a formwork stand 10, a columnar formwork 20, a lid member 30, and a lid fixing member 40. The four legs 11 of the mold support 10 are arranged at the positions of the apexes of the square, and are fixed to the two ring-shaped reinforcing hoops 12 respectively. As shown in FIG. 6, a male screw is formed in a bolt shape at the upper end of each leg portion 11, and an adjustment nut 13 and a mounting nut 14 are screwed together. As shown in FIG. 4, each leg 11 is installed at the bottom of the foundation installation hole 1 so as to surround the main leg 3 with a space between the main leg 3 and the inner wall of the foundation installation hole 1. To do.

  As shown in FIG. 6, the support frame 15 is formed of a ring having an F-shaped cross section, and includes a ring-shaped groove portion 15 a and a flange portion 15 b that protrudes inward from the groove portion 15 a. Four bolt holes 15c are formed in the groove portion 15a. The upper ends of the respective leg portions 11 are inserted into the respective bolt holes 15c, the groove portions 15a are sandwiched between the adjustment nuts 13 and the mounting nuts 14, and the support frame 15 is adjustable in height at the upper portion of each leg portion 11 and is detachable. It is attached as possible. The support frame 15 is adjusted to be horizontal by adjusting the height of the position of each leg 11.

  As shown in FIG. 5, the lowermost step 21 of the columnar mold 20 is provided on the support frame 15 of the mold support 10 so as to surround the main leg 3 with a space between the main leg 3. As shown in FIG. 7, the columnar mold 20 is formed of an elongated truncated cone cylinder, and can be divided into a plurality of short truncated cone cylinders 22. An existing product can be used for the columnar formwork 20. The lowermost stage 21 and each cylindrical formwork 22 of the columnar formwork 20 have flanges 23 projecting outward from the upper and lower ends. As shown in FIG. 6, the cylindrical mold 22 in the lowermost stage 21 has a lower flange 23 placed on the flange portion 15b of the support frame 15 and sandwiched between fixing brackets 24, and is flanged with bolts and nuts or U-shaped clips. It is detachably attached to the part 15b. After adjusting and confirming the position of the lowermost stage 21 of the columnar mold 20, the lower pedestal 11a of each leg 11 is fixed to the bottom of the foundation installation hole 1 with mortar.

  As shown in FIG. 8, the lid member 30 is disposed so as to be supported by the upper support frame 15 of the mold support base 10 and the inner wall portion of the foundation installation hole 1. The foundation installation hole 1 is closed between the support frame 15 and the inner wall. The lid member 30 is formed by detachably connecting a plurality of divided lids 31 in the horizontal direction. Since the lid | cover material 30 is divided | segmented into the some division | segmentation lid | cover 31, it can make it easy to convey. Each divided lid 31 has a shape in which a ring-shaped plate having a plurality of water passage holes 32 is divided by a plurality of straight lines extending in the radial direction, and the periphery of the divided plate is surrounded by side walls. The water passage hole 32 is formed by punching. Each divided lid 31 is connected to another divided lid 31 by overlapping a side wall, and connecting members such as U-shaped clips are detachably inserted into a plurality of mounting holes provided on the side wall. The connecting member may be a bolt and a nut.

  As shown in FIG. 9, the lid member 30 is attached to the liner plate 2 by lid fixing members 40 at four locations. As shown in FIG. 10, the lid fixing member 40 has an elongated bar shape, and has an upper end attachment portion 41 that is detachably attached to the joint 2 a of the liner plate 2 at the upper end, and is detachable from the lid member 30 at the lower end. It has the lower end attachment part 42 attached. The upper end mounting portion 41 is composed of two plate materials that can be fastened to each other, and is attached to the liner plate 2 by clamping the joints 2a of the two liner plates 2 that overlap each other between the plate materials.

  As shown in FIG. 3 (E), the lower end attachment portion 42 has a bolt hole 42a. The lower end attachment portion 42 is attached to the lid member 30 by inserting a bolt into the bolt hole 42a and the attachment hole on the side wall of the lid member 30 and fastening with a nut. The lid fixing member 40 has a turnbuckle 43 and can be adjusted in length. The lid member 30 is securely fixed by the lid fixing member 40 and has a strength that allows an operator to work on the lid member 30.

  Several division lids 31 are removed, for example, four places, and a concrete placement opening to the foundation installation hole 1 on the lower side of the lid member 30 is opened. Since the division | segmentation lid | cover 31 can be attached or detached, the concrete placement inside the hole 1 for foundation installation can be made easy. As shown in FIG. 11, the placement chute 6 is installed, and concrete is placed through the placement chute 6 from the concrete placement opening 7 into the foundation installation hole 1. The concrete placed below the lid member 30 becomes the base portion A. The base portion A is placed until the concrete oozes out from the water passage hole 32 of the lid member 30. After the concrete is placed, the removed split lid 31 is returned to the original position, and the concrete placing port 7 is closed. Water and concrete overflowing from the water passage holes 32 of the lid member 30 are removed. It is also possible to confirm the concrete placement state of the base portion A from the water passage hole 32.

  As shown in FIG. 12 (A), concrete is poured into the inside from the upper opening 25 of the columnar mold 20. At that time, as shown in FIG. 12 (B), the vibrator 8 is inserted from the upper opening 25 of the columnar mold 20 to the concrete of the base portion A on the lower side of the lid member 30, and the concrete is compacted appropriately. Curing is performed after placing the concrete in the columnar formwork 20. At this time, since each divided lid 31 has a plurality of water passage holes 32, the water / air can be escaped from the water holes 32 during curing of the concrete of the base portion A.

As shown in FIG. 13, after the curing period is over and the placed concrete is solidified, the lid member 30 and the columnar formwork 20 are removed from the placed concrete. The lid fixing member 40 can be removed from the liner plate 2 and the lid member 30 and reused. Since the plurality of divided lids 31 are detachably connected, they can be easily removed and reused. The column form 20 can also be reused. When the adjusting nut 13 and the mounting nut 14 are removed from the upper part of each leg member, the removed holes are repaired with a mortar 9 as shown in FIG.
In this way, the steel tower foundation concrete shown in FIG. 13 is completed.

  In the steel tower foundation concrete form and the steel tower foundation concrete construction method of the embodiment of the present invention, the lid member 30 closes the foundation installation hole 1 between the upper part of the form support base 10 and the inner wall part, and the form support is received. Since the columnar formwork 20 is provided at the top of the gantry 10, the concrete is placed inside the columnar formwork 20 immediately after the concrete is placed up to the height of the lid 30 inside the hole 1 for foundation installation. Can do. For this reason, since it is not necessary to wait for the solidification of the base part A for the concrete placement of the columnar part B, the construction period can be shortened. Moreover, since a joint is not generated between the base part A and the columnar part B, the quality of the steel tower foundation concrete can be improved.

  Furthermore, when carrying concrete with a helicopter on the site in a mountainous area, the concrete placement of the base part A and the concrete placement of the columnar part B can be performed at one time. The number of airlifts can be reduced, reducing costs.

DESCRIPTION OF SYMBOLS 1 Hole for base installation 1a Base part accommodating part 1b Base part accommodating part 2 Liner plate 2a Joint 3 Main leg material 4 Saddle material 5 Reinforcement material 6 Placing chute 7 Concrete placing port 8 Vibrator 9 Mortar 10 Formwork stand 11 Leg part 11a Bottom pedestal 12 Reinforcement hoop bar 13 Adjustment nut 14 Mounting nut 15 Support frame 15a Groove part 15b Flange part 15c Bolt hole 20 Column body frame 21 Bottom stage of column body mold frame 22 Cylindrical mold frame 23 Flange 24 Fixing bracket 25 Upper opening 30 Lid material 31 Divided lid 32 Water passage hole 40 Lid fixing member 41 Upper end mounting portion 42 Lower end mounting portion 42a Bolt hole 43 Turnbuckle A Base portion B Column body portion

Claims (5)

It is a formwork for steel tower foundation concrete provided at the periphery of the main legs that are arranged at the bottom of the hole for foundation installation and extend vertically.
A formwork cradle provided at the bottom of the foundation mounting hole so as to surround the lower end of the main leg,
A columnar formwork provided to surround the main leg material on the upper part of the formwork support;
A lid member that is supported by the upper part of the formwork support and the inner wall part of the hole for foundation installation, and closes the hole for foundation installation between the upper part of the formwork support and the inner wall part,
The formwork for steel tower foundation concrete characterized by having.   2. The formwork for steel tower foundation concrete according to claim 1, wherein the lid member is formed by detachably connecting a plurality of divided lids in the lateral direction, and each divided lid has a plurality of water passage holes.   It has a lid fixing member, the foundation mounting hole has a liner plate on the inner wall, the liner plate has a flange-like seam on the inner periphery, and the lid fixing member is removable at the upper end of the seam The formwork for steel tower foundation concrete according to claim 1 or 2, further comprising a top end mounting portion to be mounted and a bottom end mounting portion detachably mounted to the lid member at a lower end.   The form cradle has three or more legs and a support frame, and the support frame is detachably attached to the upper part of each leg, and the columnar form frame is attached to the support frame. The formwork for steel tower foundation concrete according to claim 1, 2 or 3, characterized by being detachably attached. Forming a hole for foundation installation;
Placing the lower end of the main leg at the bottom of the foundation installation hole, and installing the main leg to extend in the vertical direction;
Installing a formwork cradle at the bottom of the foundation installation hole to surround the lower end of the main leg;
Providing a columnar mold so as to surround the main leg material on the upper part of the mold support;
A lid material is supported by the upper part of the formwork cradle and the inner wall part of the foundation mounting hole, and a concrete placement opening is opened between the upper part of the formwork cradle and the inner wall part by the lid material. A step of closing the hole for foundation installation;
Placing concrete from the concrete placement opening to the height of the lid material inside the foundation installation hole;
Placing concrete inside the columnar formwork,
A steel tower foundation concrete construction method characterized by comprising:

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