JP2001262592A - Foundation of structure and execution work method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation structure having large proof strength to a load of a structure and easy in execution work. SOLUTION: This foundation is composed of a foundation material 20 integrally arranged in a lower part of a column base 10 and plural foundation piles 30 driven in the parallel direction to the column base 10 in bedrock G for joining a pile head to the foundation material 20. The foundation material 20 is composed of plural ribs 21 and a body flange 22 proviously joined to the lower part of the column base 10 and a joining member group 23 for joining the pile head of the foundation piles 30 to the body flange 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a basic structure for supporting various structures such as a steel tower for supporting a transmission line on an elevated level.

[0002]

2. Description of the Related Art As a foundation structure for supporting a column base such as a steel tower on the ground, there has been conventionally known, for example, a foundation pile as shown in FIG. First, a foundation structure 100A shown in FIG. 1A includes a foundation pile 102 made of a steel pile, a cast-in-place concrete pile, or the like, which is driven into the ground G.
And a footing 103 made of concrete integrated with the pile head 102a, and a column base 101 is constructed on the footing 103. Usually, one to a plurality of foundation piles 102 are vertically driven per footing 103.

The basic structure 1 shown in FIG.
00B, a foundation pile 102 composed of a large diameter cast-in-place concrete pile is vertically constructed on the ground G, and a column base 1
01 is embedded and connected. The foundation pile 102 is cast into a vertical frame 102b formed of reinforced concrete and a steel pipe 102c extending from the head to be exposed on the ground G, and reinforces and protects the lower part of the column base 101. And a pillar portion 102d.

[0004]

In recent years, for example, in the case of a power transmission tower, in order to compensate for an increase in the amount of slack in the transmission line due to an increase in the weight of the transmission line due to an increase in power demand, the transmission line is required. It is necessary to increase the supporting height of the tower, which tends to increase the height of the tower. As a result, the weight of the pylon increases, and it is required to improve the supporting force of the foundation structure that supports the pylon. However, FIG.
According to the prior art shown in FIG. 3, it is necessary to increase the area of the footing 103 or to increase the diameter of the foundation pile 102 in order to improve the supporting force of the foundation structure, so that the construction cost of the foundation is expensive. In addition to this, there was a problem that land with a large area had to be secured.

[0005] In order to construct a large-diameter foundation pile, a large-sized construction machine is required. For example, in the case of a steel tower built on a mountainous slope, a cut area for securing a foothold for the construction machine is required. Enlargement and temporary construction of the scaffolds also took a large scale, resulting in construction difficulties and increased construction costs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a main technical problem thereof is to provide a foundation structure which has a large resistance to a load of a building and is easy to construct. It is in.

[0007]

Means for Solving the Problems As means for effectively solving the above technical problems, the foundation of the structure according to the present invention is composed of a base material integrally provided at a lower portion of a pillar of the structure, and a pile. One or more foundation piles whose heads are joined to the base material and are driven into the ground in a direction parallel to the pillars, or an extension of the axis of the pillars to the ground where the pile heads are joined to the foundation material And a plurality of foundation piles driven in the direction opened at an equal angle around the center. That is, when the foundation pile is driven in a direction parallel to the column or in a direction opened at an equal angle around the axis of the column, only the axial force of the load of the structure will be supported, and footing etc. Because we do not build
The construction is easy and the construction area can be reduced.

In the present invention, the base member is provided integrally with a lower portion of the column in advance and extends in the axial direction of the column, and the base member is provided integrally with the lower portion of the column and the rib in advance. And a connecting member group for connecting a pile head of a foundation pile to the main body flange.

Further, the method for constructing a foundation of a building according to the present invention comprises the steps of: integrally providing a foundation member having means for coupling with a pile head to a lower portion of a pillar; A step of placing a plurality of foundation piles into the ground in a direction parallel to the axis of the pillar or in a direction opened at an equal angle around the planned angle of the pillar to be built, and a planned construction position on the ground And connecting the foundation material provided integrally therewith to the pile head of the foundation pile via the coupling means.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the foundation of the construct according to the present invention will be described with reference to FIGS. FIG. 1 schematically shows the basic structure of the present invention together with a part of a power tower built thereon.
Reference numeral 10 in the figure is a column base of a steel tower, and 20 is this column base 10.
Base material made of steel or the like joined to the lower end of
Is a foundation pile in which a pile head 30a is joined to the foundation material 20 and is driven into the ground G in a direction parallel to the column base 10.

The base member 20 is integrally welded to the lower periphery of the column base 10 by welding at predetermined circumferential intervals (90 ° intervals in the illustrated example) so as to form a plane passing through the axis thereof. A plurality of ribs 21 made of a steel plate, and a square main body flange 22 made of a steel plate integrally joined to the outer periphery of the lower part of the column base 10 by welding so as to form a plane perpendicular to its axis. The connecting member group 2 provided on the main body flange 22 is located in the area divided into four by the rib 21.
3 is provided. Each of the ribs 21 has a lower end reaching the lower end position of the column base 10, and each of the ribs 21 has a main body flange 22.
Are joined at right angles to each other. Further, these members constituting the base material 20 are rust-proofed by plating or spraying after construction or the like.

The base member 20 connects the lower part of the column base 10 and the pile head of the foundation pile 30 and also includes the column base 10.
Is transmitted to the ground G and the foundation pile 30. Further, the column base 10 of the tower is built so as to form a predetermined inclination angle with respect to the horizontal plane. However, since the foundation pile 30 is cast so as to be parallel to the column base 10, the column base 10 The structure is such that bending stress due to the load of the steel tower is unlikely to act between the steel pile and the foundation pile 30, and excellent strength against load is obtained.

By laying an iron plate 4 having a larger area than the main body flange 22 on the lower surface of the base member 20, as shown in FIG.

On the other hand, as the foundation pile 30, a pile having a known structure and a relatively small diameter (for example, 300 mm or less) and having a high yield strength is suitably used. That is, as shown in FIG. 3, this foundation pile 30 is inserted to the lower end depth of the soft layer G1 in the ground G, and the head is connected to the main body flange 22 of the foundation member 20 with the connecting member group 23.
And a lower end of the steel pipe 31 which is inserted through the inner periphery of the steel pipe 31 so as to reach a rigid support layer G2 below the soft layer G1 and a head of which is connected to the body flange 2
2 is formed from a deformed reinforcing bar 32 as a core material connected via the connecting member group 23 to the steel pipe 31 and a grout 33 as a consolidated material filled between the ground pile G and the deformed reinforcing bar 32. It becomes. Grout 33 is steel pipe 3
On the lower side of 1 (in the support layer G2), it is diffused in a pedestal shape, and a part of the grout 33 goes around the outer peripheral side of the steel pipe 31 and is fixed on the drilled surface of the ground pile G. .

FIGS. 4 to 6 show a base member 20 and a base pile 30.
The steel pipe 31 of the foundation pile 30 can be inserted into the region of the main body flange 22 of the base material 20 divided into four by each rib 21 with appropriate play, as exemplified by various connection structures with the base member 20. A coupling hole 22a is provided.

Of these, in the example shown in FIG.
The connecting member group 23 is a steel lower flange 231 fixed by welding or the like to the outer periphery of the base pile 30 near the head of the steel pipe 31 so as to be located below the main body flange 22.
A steel upper flange 232 fixed by welding or the like to the outer periphery of the head of the steel pipe 31 protruding from the coupling hole 22a to the upper side of the main body flange 22, and a plurality of steel upper flanges 232 arranged on the upper flange 232; Of the upper flange 2 between the main body flange 22 and the main body flange 22 by the tightening of the screw member 233 of FIG.
The steel support plate 234 presses the pile head of the foundation pile 30 with the pinch 32 held therebetween. A screw hole 234a is formed at the center of the support plate 234, and the head of the deformed reinforcing bar 32 of the foundation pile 30 is screwed into the screw hole 234a so as to be connected to the support plate 234. Has become.

In the example shown in FIG. 5, the connecting member group 23 is fixed to the outer periphery near the head of the steel pipe 31 in the foundation pile 30 by welding or the like so as to be located below the main body flange 22. A lower flange 231 made of steel and a head of the steel pipe 31 protruding from the coupling hole 22a to the upper side of the main body flange 22 and arranged so that an outer peripheral lower surface is in contact with the main body flange 22, and is welded or the like. The head of the deformed reinforcing bar 32 in the foundation pile 30 is connected to the steel supporting cap 235 fixed to the main body flange 22 and the reinforcing bar insertion hole 235a opened at the upper center of the supporting cap 235. A pair of nuts 236,
236.

In the example shown in FIG. 6, the connecting member group 23 is fixed to the outer periphery near the head of the steel pipe 31 in the foundation pile 30 by welding or the like so as to be located below the main body flange 22. A steel lower flange 231, a steel upper flange 232 fixed by welding or the like to the outer periphery of the head of the steel pipe 31 projecting upward from the coupling hole 22 a to the main body flange 22, and the upper flange 232.
And a steel bearing plate 234 for holding the pile head of the foundation pile 30 with the upper flange 232 sandwiched between the main body flange 22 and the plurality of bolts 237.
And the reinforcing bar insertion hole 2 opened at the center of the support plate 234.
34b, a pair of nuts 236 and 236 for connecting the head of the deformed reinforcing bar 32 in the foundation pile 30 in an inserted state.

Next, a construction procedure for constructing a steel tower adopting the above-mentioned basic structure on a sloping land in a mountainous part will be described with reference to FIGS.

First, as shown in FIG. 7, cutting of the slope 1 of the ground G and construction of the scaffold 2 are performed. That is, the slope 1 of the ground G on which the foundation of the steel tower is to be constructed is cut to form a cut surface 1a having a slope orthogonal to the inclination angle of the column base 10, and the temporary construction constructed on the slope below the slope. The earth material 3 generated by the cut is buried between the scaffold 2 and the scaffold 2 so as to have a continuous height with the cut surface 1a. In the present invention, since the footing 103 as in the prior art shown in FIG. 13 is not applied, the cut surface 1a may have a relatively small area.

Next, as shown in FIG. 8, the iron plate 4 is laid on the cut surface 1a formed by the cut at the construction position of the foundation. The iron plate 4 has an area larger than the projected area in the axial direction of the column base 10 shown in FIGS. 2 and 3 and the like, in other words, the area of the main body flange 22. Correspondingly, the foundation pile insertion hole 4a through which the steel pipe 31 of each foundation pile 30 can be inserted with an appropriate play is opened, so that the placement location of the foundation pile 30 can be easily determined.

Next, as shown in FIG.
Thus, the direction perpendicular to the cut surface 1a from the foundation pile insertion hole 4a of the iron plate 4 into the ground G, in other words, the axis of the column base 10 of the steel tower built on the cut surface 1a. Stake out in a direction parallel to the heart. As described above, since the foundation pile 30 has a relatively small diameter, pile driving can be performed by the small construction machine 5. Therefore, the area of the temporary scaffold 2 and the embankment can be reduced.

As is well known, in the placing operation of each foundation pile 30, first, boring (casing excavation) is performed using a casing having a diameter larger than that of the steel pipe 31 of the foundation pile 30, and Is formed to reach the inside of the support layer G2. At this time, the steel pipe 31 is inserted together with the casing up to the support layer G2 of the ground G in accordance with the boring. After drilling, the steel pipe 31
Is left in the ground G, and only the casing is pulled out. Next, the deformed reinforcing bar 32 is inserted into the steel pipe 31.
A device for press-fitting grout 33 is attached to 2 and is inserted together. When the insertion is completed, the grout 33 is press-fitted into the hole by using the press-fitting device, and the steel pipe 31 is pulled up to a predetermined height in accordance with the grout 33. When the grout 33 is sufficiently filled, the steel pipe 31 is inserted again, and simultaneously the grout 33 is press-fitted. Then, the grout 33 is diffused in a pedestal shape below the steel pipe 31 by the pressing force at this time.

After the placement of the foundation pile 30 is completed, the column base 10 is erected on the iron plate 4 as shown in FIG. The column base 10 is transported to the site and built therein in a state where the ribs 21 and the main body flanges 22 of the coupling member group 20 are integrally joined by welding or the like at a lower portion thereof in advance. As shown in FIGS. 3 to 5, a lower flange 231 which is a part of the coupling member group 23 is previously joined to the upper end of the steel pipe 31 of the foundation pile 30 by welding or the like.

When the column base 10 is erected, the connection holes 22a of the main body flange 22 joined to the lower part thereof are
The pile heads of the respective foundation piles 30 protruding from the foundation pile insertion holes 4a of the iron plate 4 on the ground G are passed through, and are coupled by the coupling member group 23 in a manner as shown in FIGS. Thereafter, if necessary, rustproofing is performed by painting, spraying, or the like, and then the earth material 3 is buried on the cut surface 1a.

In the above embodiment, the foundation pile 30 is
Although the base piles 30 were driven in parallel with the axis of the column base 10, that is, the foundation piles 30 were parallel to each other, as shown in FIG. 11 as another embodiment of the present invention, the axis O of the column base 10 Can also be cast in directions that are open at equal angles to each other with the extension line of the center as the center.

In this case, the body flange 22 of the base material 20
As shown in the perspective view of FIG. 12, the area divided into four by each rib 21 is provided in a state of being inclined so as to form a plane orthogonal to the driving direction of each foundation pile 30. Thus, the load from the column base 10 can be transmitted in the axial direction of each foundation pile 30.

The foundation pile 3 used in the present invention
As 0, any material can be used as long as it can be combined with the base material 20 and exhibits required strength.

[0029]

According to the foundation structure according to the present invention, the foundation pile is driven in a direction parallel to the column or in a direction opened at an equal angle around the axis of the column, thereby reducing the load on the structure. Large yield strength is obtained. In addition, the construction area is small because the pillar and the foundation pile are connected using the foundation material without building a footing, etc., so it is possible to carry out construction with a small construction machine. , And the construction period can be shortened and the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing a basic structure according to an embodiment of the present invention, together with a part of a power tower built thereon.

FIG. 2 is a perspective view showing a schematic configuration of a base material in the embodiment.

FIG. 3 is a sectional view showing a schematic configuration of a foundation pile in the embodiment.

FIG. 4 is a cross-sectional view of a main part showing an example of a connection structure between a base member and a base pile in the embodiment.

FIG. 5 is a cross-sectional view of a main part showing another example of the connection structure between the base material and the base pile in the embodiment.

FIG. 6 is a cross-sectional view of a main part showing another example of the connection structure between the base member and the base pile in the embodiment.

FIG. 7 is an explanatory diagram schematically showing a cut and a scaffold construction state in the construction of a structure employing the foundation structure according to the embodiment.

FIG. 8 is an explanatory diagram showing a state in which an iron plate is laid on a cut surface in the construction of a structure employing the foundation structure according to the embodiment.

FIG. 9 is an explanatory diagram showing a pile driving operation in the construction of a structure employing the foundation structure according to the embodiment.

FIG. 10 is an explanatory view schematically showing a connection state between a pile head of a foundation pile and a column base in the construction of a structure employing the foundation structure according to the embodiment.

FIG. 11 is a perspective view illustrating a schematic configuration of a base material according to another embodiment of the present invention.

FIG. 12 is an explanatory view schematically showing a foundation structure according to another embodiment of the present invention, together with a part of a power tower built thereon.

FIG. 13 is an explanatory view showing a basic structure according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Column base 20 Foundation material 21 Rib 22 Main body flange 23 Connecting member group 30 Foundation pile

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masahiro Nakamura 4-6-115 Sendagaya, Shibuya-ku, Tokyo Inside Fujita Co., Ltd. (72) Inventor Etsuro Saito 4-6-115 Sendagaya, Shibuya-ku, Tokyo F term in the company Fujita (reference) 2D046 AA14 CA01 DA31

Claims (4)

[Claims] 1. A foundation material integrally provided below a pillar of a building, and one or more foundations having a pile head connected to the foundation material and driven into the ground in a direction parallel to the pillar. The foundation of a structure characterized by consisting of a stake. 2. A foundation member integrally provided at a lower portion of a column of the building, and a pile head is connected to the foundation member and is opened to the ground at an equal angle around an extension of the axis of the column. A foundation for a structure, comprising a plurality of foundation piles that have been cast. 3. A plurality of ribs, wherein a base material is previously provided integrally with a lower portion of the column and extends in the axial direction of the column; and a shaft of the column which is previously provided integrally with the lower portion of the column and the rib. 3. The foundation of a building according to claim 1, comprising: a main body flange forming a plane orthogonal to the core; and a connecting member group connecting a pile head of a foundation pile to the main body flange. 4. 4. A step of integrally providing a foundation member provided with a connection means to a pile head at a lower portion of a column, and from a position where the column is to be constructed on the ground, into the ground and parallel to an axis of the column. A step of placing a plurality of foundation piles in a direction that is opened at an equal angle around the direction or the planned installation angle of the column, and erection of the column at a planned construction position on the ground,
Joining the foundation material provided integrally therewith to the pile head of the foundation pile via the joining means.