JP2004190241A - Foundation structure of main column erected on ground - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure a reliability on the burying strength of a pipe pile and the perpendicularity of the pipe pile as much as possible regardless of a ground structure in the foundation structure of a main column erected on the ground. <P>SOLUTION: In the foundation structure of the ground-surface in which main columns 13 are erected and pits 3 are excavated, the pipe piles 6 are buried into the pits 3, the insides of the pipe piles 6 are filled with filling crushed stones 11 or filling concrete to form in-pipe foundations 12, the lower end sections of the main columns 13 are inserted movably into the pipe piles 6 and supported to the in-pipe foundations 12 and sections among the lower end sections of the main columns 13 and the inner peripheral surfaces of the pipe piles 6 are filled with filling concrete 16, the pipe piles 6 are buried into the pits 3 at annular spaces, the insides of the annular spaces 7 are filled with hydraulic-filling sand 8 and the pipe piles 6 are supported, encased concrete 17 foot-protecting the main columns 13 is placed into shallow wide-mouthed holes 1 at the upper ends of the pits 3 and the upper-end opening surfaces of the pipe piles 6 and the upper-end opening surfaces of the annular spaces 7 are concealed by foot protection concrete 17. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a basic structure of a main pillar standing on the ground, such as a main pillar for posting a traffic sign or a signboard, or a main pillar for extending a net such as a driving range.
[0002]
[Prior art]
In Patent Document 1, a vertical hole is excavated in the ground, and a pipe pile is embedded in the vertical hole, and the inside of the pipe pile is filled with crushed crushed stone or medium-filled concrete to form a pipe foundation. Disclose the main structure of the main pillar standing on the ground by inserting the lower end of the main pillar into the pipe foundation and supporting it on the above-mentioned pipe foundation, and filling in the concrete between the lower end of the main pillar and the inner peripheral surface of the pipe pile. ing.
[0003]
[Patent Document 1]
Japanese Examined Patent Publication No. 3-28540 [0004]
[Problems to be solved by the invention]
However, in the basic structure of the ground standing main pillar shown in the above-mentioned Patent Document 1, a structure in which the main pillar is directly restrained by the inner peripheral surface of the vertical hole is adopted. The pipe piles are also tilted, and there is a risk of hindering the upright of the main pillar.
[0005]
In addition, the strength of the ground that defines the vertical hole varies depending on the site, and the pipe pile and main column support strength by the ground is unreliable, and the inner peripheral surface of the vertical hole partially collapses and generates a nest. ing.
[0006]
In addition, the standing strength of the main pillar depends only on the embedded concrete and the root-wrapped concrete (raised mortar). The concrete deteriorates over time, or a gap is generated at the interface between the main pillar and concrete after the concrete is cast. It has the problem of impairing the standing strength.
[0007]
[Means for Solving the Problems]
The present invention provides a foundation structure of a ground standing main pillar that appropriately solves the above problems.
[0008]
The foundation structure of this ground standing main pillar excavates a vertical hole in the ground, embeds a pipe pile in the vertical hole, fills the pipe pile with crushed stone or medium concrete, and forms a pipe foundation, The lower end of the main pillar is loosely inserted into the pipe pile and supported by the pipe foundation, and the ground standing main pillar is formed by filling in the concrete between the lower end of the main pillar and the inner peripheral surface of the pipe pile. It is a basic structure, and an annular interval is formed between the outer peripheral surface of the pipe pile and the inner peripheral surface of the vertical hole, and the ring pile is filled with water-tight sand to firmly support the pipe pile, and thus support the column stably. To do.
[0009]
Further, a structure in which a root-wrapped concrete that solidifies the main pillar is placed in a shallow widened hole at the upper end of the vertical hole, and the upper-end opening surface of the pipe pile and the upper-end opening surface of the annular interval are concealed by the root-wrapped concrete. Take.
[0010]
The foundation structure of the ground standing main pillar ensures the reliability of pipe pile burying strength as much as possible with the water-tight sand regardless of the ground structure.
[0011]
As another example, while adopting a structure in which watertight sand is filled in an annular interval between the outer peripheral surface of the pipe pile and the inner peripheral surface of the vertical hole to support the pipe pile, the pipe pile crossing the pipe pile opening surface and both ends of the pipe pile are taken. A both-end support bar welded or screwed to the upper end surface is provided, and the transverse portion of the both-end support bar is welded or screwed to the side surface of the main column to firmly support the main column to the pipe pile.
[0012]
Further, a root-rolling concrete that solidifies the main pillar is placed in the shallow widening hole at the upper end of the vertical hole, the both-end support bar is embedded in the root-wrapping concrete, and the upper end opening surface of the pipe pile and the annular shape A structure that conceals the upper end opening surface of the interval is adopted.
[0013]
As in the above example, the foundation structure of the ground standing main pillar is to ensure the reliability of pipe pile burying strength regardless of the ground structure, and to guarantee the verticality of the pipe pile as much as possible. At the same time, the above-mentioned doubly-supported support bar ensures the standing strength and verticality of the main column in cooperation with the embedded concrete and the cored concrete.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the basic structure of the main standing column according to the present invention will be described in detail based on the steps (construction methods) shown in FIGS.
[0015]
As shown in FIG. 1, the widening hole 1 is rooted in the ground, and a so-called root cutting hole is excavated. In the case where the ground is paved with concrete or asphalt, the pavement is cut and removed into a square or the like to form the widened hole 1, and the ground is exposed in the widened hole 1. In the case of clear land, the ground surface layer is excavated into a square or the like to form the above-mentioned widened hole 1.
[0016]
Next, as shown in FIG. 2, a vertical hole 3 is excavated to a required depth at a substantially central portion of the expanded hole 1 by using a so-called auger 2 having a spiral excavation fin on the peripheral surface of the shaft.
[0017]
Next, as shown in FIG. 3, the bottom foundation 5 is formed by introducing the bottomed crushed stone 4 into the inner bottom of the vertical hole 3.
[0018]
Next, as shown in FIG. 4, the pipe pile 6 is loosely embedded in the vertical hole 3 and the lower end surface thereof is supported on the bottom foundation 5, and the outer peripheral surface of the pipe pile 6 and the inner peripheral surface of the vertical hole 3. An annular interval 7 is formed between them. That is, the pipe pile 6 is embedded in the vertical hole 3 with an annular interval 7.
[0019]
The said pipe pile 6 is a pipe pile which has the penetration lumen | bore open | released at both ends, and consists of a concrete pipe pile or a steel pipe pile.
[0020]
As shown in FIG. 4, the pipe pile 6 protrudes from the opening surface of the vertical hole 3 into the enlarged hole 1 while supporting the lower end surface on the bottom foundation 5. Alternatively, while supporting the lower end surface of the pipe pile 6 on the bottom foundation 5, the upper end surface is embedded at substantially the same level as the opening surface of the vertical hole 3.
[0021]
Next, as shown in FIG. 5, sand is filled in the annular interval 7 between the outer peripheral surface of the pipe pile 6 and the inner peripheral surface of the vertical hole 3 while water-tightening. 8 shows this watertight sand.
[0022]
It is important to prevent the inner peripheral surface of the vertical hole 3 from collapsing when the water is tightened and to prevent water from being injected into the pipe pile 6. For example, the upper end opening surface of the pipe pile 6 is covered with a lid 9. And crushing sand, preferably mountain sand, on the lid 9, and crushing the raised sand 8 ′ with water 22 discharged from the hose 10 connected to the water supply, and the annular spacing along the outer circumferential surface of the pipe pile 6. Pour sand 8 into 7 and fill.
[0023]
The water-tightening sand 8 is released while its moisture penetrates into the bottom foundation 5, and is tightly sanded, so-called watertight. The lower end of the water-tightening sand is supported on the bottom foundation 5 and is filled until the upper end surface is substantially at the same level as the opening surface of the vertical hole 3.
[0024]
Next, as shown in FIG. 6, the lid 9 is removed, and a medium-filled crushed stone 11 is filled in the pipe pile 6 and laminated on the bottom foundation 5 to form the pipe foundation 12.
[0025]
The in-pipe foundation 12 can be formed by filling the inside of the pipe pile 6 with the inside concrete instead of the inside crushed stone 11.
[0026]
Next, as shown in FIG. 7, the lower end portion of the main pillar 13 made of a prism or a cylinder is loosely inserted into the pipe pile 6 in which the inner pipe foundation 12 is formed, and the lower end surface is supported on the upper surface of the inner pipe foundation 12. The annular interval 15 is formed between the outer peripheral surface of the lower end portion of the main column 13 and the inner periphery of the upper end of the pipe pile 6.
[0027]
The main pillar 13 is a steel pipe main pillar or a concrete main pillar, both of which are existing, and are selectively used according to the application. The concrete main column has a structure in which a ring-shaped steel cover 23 is fitted on the upper end surface of the column and reinforced.
[0028]
Next, as shown in FIG. 8A, the wedge 14 is driven into the annular space 15 between the main pillar 13 and the pipe pile 6 from the upper end opening surface of the pipe pile 6 to keep the main pillar 13 upright. A plurality of wedges 14 are driven around the main pillar 13 at substantially equal intervals, and the main pillar 13 is supported at a substantially central portion of the pipe pile 6.
[0029]
Next, as shown in FIG. 9A, the embedded concrete 16 is filled into the annular interval 15 through the wedges 14 to support the main pillar 13. The inside concrete 16 is filled until the lower end reaches the pipe foundation 12 and the upper end surface reaches substantially the same level as or directly below the opening surface of the pipe pile 6.
[0030]
Next, as shown in FIG. 10A, the wedge 14 is removed or the wedge 14 is left, and a root-rolling concrete 17 that solidifies the main pillar 13 is placed in the widened hole 1. In 17, the upper end surface and upper end opening surface of the pipe pile 6 and the upper end opening surface of the annular interval 7 filled with the water-tightening sand 8 are concealed, and are integrated with the pipe pile 6 and integrated concrete.
[0031]
When the upper end of the pipe pile 6 protrudes into the enlarged hole 1 as described above, the root-wrapped concrete 17 is filled between the outer peripheral surface of the protruding portion 18 of the pipe pile 6 and the inner peripheral surface of the enlarged hole 1. The projecting portion 18 is integrally embedded in the root-wrapped concrete 17.
[0032]
Next, the basic structure of the main standing column which does not use the wedge 14 will be described with reference to FIGS. 8B and 8C, FIG. 9B and FIG. 10B.
[0033]
The steps in FIGS. 1 to 7 are the same as those described above, and the above description is incorporated. That is, as explained based on FIG. 7, the main pillar 13 is supported upright on the foundation 12 in the pipe pile 6, and then, as shown in FIGS. 8B and 8C, crosses the opening surface of the pipe pile 6. Further, a both-end support bar 20 having both ends welded or screwed to the upper end surface of the pipe pile 6 is provided, and the transverse portion of the both-end support bar 20 is welded 21 to the side surface of the main column 13 or screwed. Thus, the main column 13 is firmly supported by the pipe pile 6. All screw stops include anchor stops. The same applies hereinafter.
[0034]
The two end support bars 20 are provided side by side along the opposite side surfaces of the main pillar 13 made of, for example, a prism or a cylinder, and each of the welds 19 and 21 is applied or screwed.
[0035]
The double-supported bar 20 can be an L-shaped channel (angle steel material) made of steel, or a steel rod, steel pipe, or the like. When the pipe pile 6 is made of a steel pipe, it is possible to weld the doubly supported bar 20, but in the case of a concrete pile, a ring-shaped steel cover is fitted on the upper end surface of the pipe pile as described above. The above-mentioned doubly-supported support bar 20 is welded or screwed to the steel cover. Or, in the case of a concrete pile without a steel cover, it is dealt with by screwing.
[0036]
Therefore, the pipe pile 6 and the main column are cooperated with the structure in which the water-tight sand 8 is firmly filled in the annular space 7 between the outer peripheral surface of the pipe pile 6 and the inner peripheral surface of the vertical hole 3 to support the pipe pile 6. 13 support strength and perpendicularity are ensured.
[0037]
Next, as shown in FIG. 9B, the interstitial concrete 16 is filled into the annular interval 15 through the support rods 20 and the main pillar 13 is supported. The inside concrete 16 is filled until the lower end reaches the pipe foundation 12 and the upper end surface reaches substantially the same level as or directly below the opening surface of the pipe pile 6.
[0038]
Next, as shown in FIG. 10B, a wrapping concrete 17 for solidifying the main pillar 13 is placed in the shallow widening hole 1 at the upper end of the vertical hole 3, and the both-end support is supported in the wrapping concrete 17. The bar 20 is embedded integrally, and the upper end opening surface of the pipe pile 6 filled with the embedded concrete 16 and the upper end opening surface of the annular interval 7 filled with the water-tightening sand 8 are filled with the concrete 17. It is concealed, integrated with the pipe pile 6 and integrated with the embedded concrete.
[0039]
When the upper end of the pipe pile 6 protrudes into the enlarged hole 1 as described above, the root-wrapped concrete 17 is filled between the outer peripheral surface of the protruding portion 18 of the pipe pile 6 and the inner peripheral surface of the enlarged hole 1. The projecting portion 18 is integrally embedded in the root-wrapped concrete 17. Reinforcing bars may be combined in the enlarged hole 1 to form a reinforced concrete structure.
[0040]
The concrete includes a mixture of cement, sand and gravel, or a mortar in which cement and sand are mixed without mixing gravel.
[0041]
The intermediate concrete 16 and the root-wrapped concrete 17 are cast separately or simultaneously.
[0042]
【The invention's effect】
According to the foundation structure of the ground standing main pillar, the reliability of the embedding strength of the pipe pile and the verticality of the pipe pile can be ensured as much as possible regardless of the ground structure by the watertight sand.
[0043]
Also, the both-end support bar cooperates with the water-tightening sand, the embedded concrete and the root-wrapped concrete to ensure the standing strength and verticality of the main pillar.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a root cutting process of an enlarged hole.
FIG. 2 is a cross-sectional view showing a vertical hole excavation process.
FIG. 3 is a cross-sectional view showing a process of forming a bottom foundation in the vertical hole.
FIG. 4 is a cross-sectional view showing a step of embedding a pipe pile standing on the bottom foundation into a vertical hole.
FIG. 5 is a cross-sectional view showing a filling process of water-tight sand into the annular interval of the pipe pile peripheral surface.
FIG. 6 is a cross-sectional view showing a process of forming a pipe foundation in the pipe pile.
FIG. 7 is a cross-sectional view showing a process of erecting a main pillar on the pipe foundation.
8A is a cross-sectional view showing a process of supporting the main column with a wedge, B is a cross-sectional view showing a process of supporting the main column with a double-supported bar without using the wedge, and C is a cross-sectional view of the process. The top view of a supporting bar.
9A is a cross-sectional view showing the process of filling the concrete pile into the pipe pile through the wedge in FIG. 8A, and FIG. 9B is the process of filling the concrete pile into the pipe pile through the doubly supported bar in FIG. 8B. Sectional drawing.
FIG. 10A is a cross-sectional view showing a step of placing the root-wrapped concrete into the widened hole in FIG. 9A using the wedge, and B is the root-wrapped concrete into the widened hole in FIG. 9B using the above-mentioned double-supported bar. Sectional drawing showing the process of placing
DESCRIPTION OF SYMBOLS 1 ... Mouth opening hole, 2 ... Auger, 3 ... Vertical hole, 4 ... Bottom crushed stone, 5 ... Bottom foundation, 6 ... Pipe pile, 7 ... Ring interval, 8 ... Water-tight sand, 8 '... Raised sand, 9 ... Lid DESCRIPTION OF SYMBOLS 10 ... Hose, 11 ... Medium-filled crushed stone, 12 ... In-pipe foundation, 13 ... Main pillar, 14 ... Wedge, 15 ... Annular spacing, 16 ... Medium-filled concrete, 17 ... Necked concrete, 18 ... Projection, 19 ... Welding 20 ... Both-end support bar, 21 ... Welding, 22 ... Water, 23 ... Steel cover

Claims (2)

Drill a vertical hole in the ground, embed a pipe pile in the vertical hole, fill the pipe pile with crushed crushed stone or medium concrete, form a pipe foundation, and the lower end of the main column in the pipe pile In the foundation structure of the main standing column which is filled with interstitial concrete between the lower end of the main pillar and the inner peripheral surface of the pipe pile, and the pipe pile is inserted into the vertical hole. Placed in the annular interval, filled with water-tight sand in the annular interval to support the pipe piles, and then cast the wound concrete that solidifies the main column in the shallow widened hole at the upper end of the vertical hole. A foundation structure of a main pillar standing on the ground, wherein the root pile concrete is configured to conceal the upper end opening surface of the pipe pile and the upper end opening surface of the annular interval. Drill a vertical hole in the ground, embed a pipe pile in the vertical hole, fill the pipe pile with crushed crushed stone or medium concrete, form a pipe foundation, and the lower end of the main column in the pipe pile In the foundation structure of the main standing column which is filled with interstitial concrete between the lower end of the main pillar and the inner peripheral surface of the pipe pile, and the pipe pile is inserted into the vertical hole. Is inserted in an annular interval, filled with water-tight sand in the annular interval to support the pipe pile, and further, the pipe pile opening surface is crossed and both ends are welded or screwed to the pipe pile upper end surface. A wrap-around concrete that includes the above-mentioned double-supported support bar, welds or screws the transverse portion of the double-supported support bar to the side surface of the main column, and further solidifies the main column in a shallow widened hole at the upper end of the vertical hole And burying the above-mentioned doubly supported bar with the root-wrapped concrete and the upper end of the above-mentioned pipe pile Basic structure of the ground elevation 設主 pillar, characterized in that it has a configuration to conceal the mouth surface and the upper end open surface of said annular spacing.

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