JP2000204569A - Steel tower footing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel tower footing unit capable of efficiently simplifing foundation work fixing a leg lever of a steel tower to the ground. SOLUTION: A site except superstructure work is erected in the ground G, and a steel tower footing unit is constituted of a post 1 exposing the superstructure work to the ground and connecting to the lower end of a leg lever B of a steel tower and an anchor base 2 set in the ground in a state to hold the post at the underside thereof. It is also equipped with a plurality of joint metal fixtures 3 connecting the anchor base to the lower end of the post in a separable manner in a state to arrange them around the lower end of the post.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel tower base unit mainly used for foundation work of large-sized steel towers such as a transmission line tower and a radio tower built on the ground.

[0002]

2. Description of the Related Art Conventionally, at the time of foundation work of a steel tower, a substructure (steel material) is installed in a shaft excavated in order to support a load on an upper part of the steel tower on a ground through steel materials, a reinforcing bar is arranged, and concrete is installed. And backfilled excavated soil to build the foundation for the tower.

[0003]

In the above-mentioned conventional construction of a steel tower, troubles requiring a complicated construction fee for constructing the foundation, and construction work is prolonged because concrete is cast, resulting in an increase in construction cost. There is a problem, especially the transport of materials and tools in mountainous areas has a great effect on construction costs.

It is an object of the present invention to provide a steel tower foundation unit capable of simplifying the foundation work of the steel tower, shortening the construction period, and performing the construction at a low level.

[0005]

According to a first aspect of the present invention, there is provided a support having a portion excluding a superstructure erected in a ground, a superstructure exposed on the ground and connected to a lower end of a leg of a steel tower. A plurality of anchor bases installed in the ground in a state where the support is received on the lower side thereof, and a plurality of anchor bases which are detachably connected to the lower end of the support in a state of being arranged around the lower end of the support. And a connection fitting.

According to the first aspect of the present invention, the anchor base is connected to the lower end of the support by a plurality of connection fittings, and a portion excluding the superstructure of the support is erected in the ground. When the upper end of the support is connected to the lower end of the pillar of the tower in a state where the support is secured in the ground by the anchor base, the lower end of the pillar of the tower is fixed to the ground by the base unit for the tower.

According to a second aspect of the present invention, in the tower base unit according to the first aspect, a column is formed of a pipe material, and a receiving bracket to which a lower end of a leg of the tower is fastened is coupled to an upper end of the column. Having a configuration.

According to the second aspect of the present invention, the lower end of the leg of the steel tower is fastened to the receiving bracket connected to the upper end of the column formed by the pipe material, so that the lower end of the leg is connected to the ground via the base unit. Fixed.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings. A large pylon such as a power transmission pylon or a radio pylon has a plurality (generally four) of legs B standing upright on the ground G with a slight inclination.

The tower base unit A used for foundation work for fixing the lower end of the tower B to the ground G is a column (vertical member) formed of a circular pipe material and connected to the lower end of the tower B. ) 1 and a support 1 formed substantially in a disk shape
An anchor base 2 connected to a lower end of the support 2 and a plurality of anchor bases 2 arranged around the lower end of the support 2 to detachably connect the anchor base 1 and the support 2 (in this embodiment, 8).
) Connecting metal fittings (suspension members) 3.

[0011] At the time of the foundation work of the tower, four sets of tower base units A, each of which includes a support 1, an anchor base 2, and a plurality of connection fittings 3, are brought into a foundation construction site in a disassembled state, and Assembled at the construction site.

The portion of the column 1 except for the superstructure is the ground G
A superstructure is erected inside, and is slightly erected above the center of the anchor base while being exposed on the ground G and connected to the lower ends of the legs of the tower.

In the vicinity of the lower end of the column 1, a plurality of upper coupling members 4 arranged at equal intervals in the circumferential direction are fixed.

As shown in FIG. 4, the support 1 is cut along the longitudinal direction at a position 90 degrees apart in the circumferential direction so that the lower end of the leg B of the steel tower is inserted thereinto. 2
Two notches 5 are formed, and two pairs of receiving metal fittings 6 that are installed facing each other with the notch 5 interposed therebetween are fixed to the outer peripheral surface of the upper end of the column 1.

The lower end of the pillar B of the tower is inserted into both cuts 5 at the upper end of the column 2 and is sandwiched between the pair of receiving brackets 6. Be linked.

As shown in FIG. 1, the anchor base 2 is
It is embedded in the ground G while being connected to the lower end of the column 1,
The support 1 is installed in a state where the support 1 is received on the lower side and is prevented from falling off.

As shown in FIGS. 1 and 2, the anchor base 2 has a disk-shaped intermediate plate 7a and two ring-shaped intermediate plates 7a concentrically installed with a gap around the intermediate plate 7a. Frame plate 7
b is formed.

As shown in FIG. 2, a plurality of base plates 7 of the anchor base 2 are arranged radially around the center of the base plate 7 at equal intervals and installed along the radial direction of the base plate 7. The lower coupling members 8 are fixed.

Each connecting fitting 3 has a bolt 13 at its upper end,
Fastened to the upper coupling member 4 of the column 1 by a nut 14,
The lower end is connected to the column 1 and the anchor base 2 with the lower end fastened to the lower connecting member 8 of the anchor base 2 by a bolt 15 and a nut 16.

According to the above-described embodiment, by connecting the anchor base 2 to the lower end of the column 1 by the respective connection fittings 3, the base unit A for the tower can be easily assembled, and the main part of the column 1 By embedding the support 1 in the ground G, the tower base unit A can be easily constructed at a predetermined position, and the foundation work for constructing the tower foundation can be simplified and streamlined to improve the tower foundation. Construction costs can be significantly reduced.

Further, since it is not necessary to cast concrete when constructing the foundation, it is possible to shorten the construction period of the foundation work for the steel tower.
It is possible to reduce the transportation cost of materials and tools such as reinforcing bars, concrete, formwork, and the like, and to save labor for each of them.

Further, since the support column 1 is formed of a pipe material, the production cost of the tower base unit A can be reduced, and the lower end of the column B of the tower is fastened to the metal fitting 6 to receive the leg. The rod B can be easily connected to the upper end of the column 1, and the work of connecting the leg B of the tower to the foundation unit A for the tower and fixing it to the ground G can be simplified and made more efficient.

Even when unnecessary towers are removed, the tower base unit A of the present embodiment can be conveniently disassembled and carried on site.

[0024]

According to the first aspect of the present invention, the base unit for the tower can be easily assembled by connecting the anchor base to the lower end of the support by each connection fitting, and the main part of the support is installed in the ground. By installing and erecting the pillars, the tower foundation unit can be easily constructed at a predetermined position, simplifying and improving the foundation work to construct the tower foundation, and greatly increasing the cost of constructing the tower foundation. Can be saved.

Further, since it is not necessary to cast concrete when constructing the foundation, the construction period of the foundation work for the steel tower can be shortened.

According to the second aspect of the present invention, since the pillar is formed of a pipe material, the manufacturing cost of the tower base unit can be reduced, and the lower ends of the legs of the tower are fastened to the metal fittings. Thus, the leg can be easily connected to the upper end of the column, and the work of connecting the leg of the tower to the tower base unit and fixing it to the ground can be simplified and streamlined.

[Brief description of the drawings]

FIG. 1 is a partially broken side view of a steel tower foundation unit showing an embodiment of the present invention.

FIG. 2 is a view taken along line X1-X1 of FIG.

FIG. 3 is a side view of a connecting portion between a column and a leg of a steel tower.

FIG. 4 is a sectional view taken along line X2-X2 of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Prop 2 Anchor base 3 Connection metal fitting 6 Receiving metal fitting A Base unit for steel tower B Leg G Ground

Claims (2)

[Claims] 1. A part excluding a superstructure is erected in the ground,
A pillar whose superstructure is exposed on the ground and connected to the lower end of the leg of the tower, an anchor base installed in the ground with this pillar received on its lower side, and a vicinity of the lower end of the pillar A steel tower base unit comprising: a plurality of connecting fittings for detachably connecting the anchor base to a lower end of the column in a state of being arranged around. 2. The base unit for a tower according to claim 1, wherein the column is formed of a pipe material, and an upper end of the column is coupled to a receiving bracket to which a lower end of a leg of the tower is fastened.