JP3095376B2 - Construction method of building foundation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method of a structural part of a building, that is, a so-called building foundation.

[0002]

2. Description of the Related Art A structural part of a building, a so-called foundation, is formed by supporting columns constituting the building with footings. Footing refers to a spread portion of a foundation, and includes an independent foundation, a composite foundation that supports two or more pillars with one foundation, and a cloth foundation that continuously forms a footing.

[0003]

The foundation as a building structure will be described with reference to a conventional independent foundation as an example. As shown in FIG. 2, a ground 3 on which a pile 36 for supporting a column 1 is erected is excavated to a predetermined depth. After a hole having a predetermined shape is formed, a concrete frame is inserted into the hole, and concrete 37 is poured into the hole. After a curing period of several days, the concrete is hardened and the footing 2 is formed.
To form In addition, the foundations are connected by the foundation beams 4 which are horizontal members, thereby preventing uneven settlement of the foundations and increasing the rigidity of the whole building. However, conventional foundation works have the following problems. 1. It is necessary to excavate the ground deeply, and it takes a lot of time and effort to properly treat the residual soil, which is a large amount of residual soil and is also industrial waste. 2. Excavation of a large area around the erected place of piles causes environmental problems, such as vibration, noise, and dust accumulation, which inconvenience the construction site. 3. It takes time and money to cast concrete, and it takes a long time to cure, so the construction period is long. 4. It is necessary to form a footing by excavating a wide area around the pillar to be erected, and it is difficult to work in an urban space that is overcrowded or in a narrow site. The site surrounded by the temporary dressing line 5 shown in FIG. 3 is the area required for the construction method according to the present invention, but the area required for the conventional foundation method is indicated by the temporary dressing line 41 and requires a large area. It is clear that

Therefore, according to the present invention, it is possible to easily set up piles in a short period of time even in a narrow site such as an urban area or an area adjacent to a building. An object of the present invention is to provide a foundation method for a rigid building using piles and the like.

[0005]

After the steel pipe pile is laid, it is cut into a suitable length, a pile head cap having a bolt in the center is welded to the pile head, and a substantially square pile side base plate is welded thereon. Place the base plate with pillars on top of this, insert the sandwiching plate between both base plates, adjust the height and horizontal level of the pillar with the number of bolts and sandwiching plates, and insert high-strength bolts into the anchor holes drilled. It is fastened and a pillar is erected on the steel pipe pile.

Further, a pile head cap and a pile base plate are attached to two or more adjacent steel pipe piles, and two or more adjacent steel pipe piles are connected by using a column base plate having an area extending over these piles. The pillars are erected in the center and the ribs are attached to form a stronger building foundation supported by two or more steel pipe piles.

Further, after a reinforced concrete pile (hereinafter referred to as a "PC pile") is laid instead of a steel pipe pile, a steel pipe pile having a diameter smaller than the inner diameter of the PC pile is welded to an end plate of the PC pile as a joint pile. A pile head cap with a bolt fitted in the center was fitted to the tip of a steel pipe pile as a joining pile for performing the adjustment, and the tip of the joining pile was sandwiched between two divided column-side base plates with through holes. After that, welded to the end of the joint pile, the column base plate with the columns erected was placed on the bolts, and the temporary bolts were inserted through the anchor holes and the through holes drilled in the column side base plate in accordance with the through holes. After inserting the sandwiching plate between the base plates and positioning the pillars, insert the temporary bolts with the sandwiching plates with grooves cut out, remove the temporary bolts, fasten both base plates with high-strength bolts, and place them on the PC pile Standing pillar And of building a the building foundation,
An end plate is attached to two or more adjacent PC piles, and a steel pipe pile having a diameter smaller than the inner diameter of the PC pile is welded to the end plate as a joint pile, and a bolt is attached at the center so that the height can be adjusted freely. The head cap is welded to the tip of the joint pile and two or more adjacent PCs are attached by attaching a column base plate having an area over these PC piles.
By connecting the piles and erecting a pillar in the center and attaching a rib plate to the pillar, a stronger building foundation supported by two or more PC piles is constructed.

Hereinafter, how the present invention works to solve the above problems will be described.

First, a steel pipe pile having a drill blade attached to the lower end of the pile body and a spiral blade attached to the outer peripheral surface of the lower end is screwed into the ground and laid, and then the tip of the steel pipe pile is cut at a predetermined length. After that, the periphery of the pile is partially dug about 20 cm in order to facilitate the subsequent work.

Next, a pile head cap with a bolt attached at the center is welded to the tip of the pile, the pile head is sandwiched between the two divided pile side base plates, and a pillar side base plate having pillars erected on the bolts is placed. Insert the temporary bolts into the holes drilled in both base plates, and adjust the horizontal level of the pillars with the desired number of sandwich plates sandwiched between both base plates,
After adjusting the height of the column with bolts, the plate is inserted instead of the plate, and after removing the temporary bolts, the pile base plate and the column base plate are fastened with high strength bolts.

Further, a column base plate having an area extending between two or more steel pipe piles is placed on the two or more steel pipe piles laid down, and reinforced with a rib plate.

In place of the steel pipe pile, a PC pile with a steel end plate attached to the tip is sunk on the ground, the steel pipe pile is welded to the end plate as a joint pile, and the pillar is attached to the pile base plate attached to the steel pipe pile as described above. PC with side base plate attached
Pillars are erected on piles.

Hereinafter, how the present invention works to solve the problem will be described.

Since the excavation blade is attached to the tip of the pile used in the present invention, it is easy to bite into the ground, and furthermore, the steel pipe pile is rotated, and the rotary penetrating force of the spirally mounted blade causes the pile to penetrate the soil. Since it is easily propelled and the earth and sand is pressed against the side of the pile, almost no residual soil is discharged, and noise and dust are not generated as compared with the conventional foundation work.

[0015] In addition, the periphery of the steel pipe pile is partially dug, but after the work is completed, the pile is buried with the discharged soil, so that the residual soil is hardly discharged. In addition, the construction period can be shortened because the steel pipe piles are immediately laid down and the process proceeds to the pillar erection process.

Further, since the steel pipe pile itself is strong, the foundation beam required for the conventional foundation is not required, and the cost and labor for the construction can be reduced.

Further, since the periphery of the foundation pile is not greatly excavated, the pile can be submerged and the pillar can be erected even in a narrow site or near the site boundary.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 5 to 10 are process diagrams showing the procedure of the foundation method using steel pipe piles.

FIG. 5 is an explanatory view showing a state in which the steel pipe pile 6 indicating the cutting level 9 at the center is laid down on the ground 8. The lower end 6a of the steel pipe pile 6 is not flat, but has a cutting blade 10 as shown in FIG. The steel pipe pile 6 is erected on the ground 8, the steel pipe pile 6 is rotated by a driving device so as to be screwed in, pressed into the ground, and the excavated and softened earth and sand excavated by the cutting blade 10 at the lower end.
Can be buried at a predetermined place with almost no remaining soil being discharged because the pile advances while pressing against the side surface of the pile 6.

Next, the pile 6 is dug about 20 cm underground.
This is to facilitate the subsequent work, and after the work is completed, the hole is buried with the discharged soil.

After the pile 6 is laid, a cutting level setting operation is performed and the tip of the pile 6 is cut at the cutting level 9. A pile head cap 12 with a bolt fitted at the center is fitted to the tip of the pile 6 as shown in FIG. I do. Thereafter, the pile head cap 12 and the pile 6 are fixed by welding.

FIG. 7 is a partial sectional view of the pile 6. The bottom surface of the iron ring 15 is attached to the inner peripheral surface of the pile 6 by welding to receive the pile head cap 12, and the backing metal 16 is attached to the outer peripheral surface of the pile 6 by welding.

Each of the notches 17 of the two rectangular pile-side base plates 17 in which the center of the long side is cut off in a semicircular shape.
a, the tip of the pile 6 is sandwiched between the piles 6 and received by the backing metal 16 welded to the outer peripheral surface of the pile 6.
7 and the backing metal 16 are welded.

At both ends of the long side of the pile side base plate 17, through holes 20 for anchor bolts are drilled in advance, and columns 21 are erected by welding on bolts 13 projecting from the center of the pile cap. The pillar-side base plate 18 is placed. The anchor holes 19 of the pillar side base plate 18 are positioned in accordance with the positions of the through holes 20 of the pile side base plate 17, and the anchor holes 19 are formed at the four corners of the pillar side base plate 18. The anchor holes 19 of the side base plate 18 are aligned with each other, and the temporary bolts 23 are inserted and attached. This is to prevent displacement of both base plates.

An appropriate number of sandwiching plates 22 made of a thin iron plate or the like are sandwiched between the two base plates 17-18, and the bolts are rotated while the wobble of the pillared base plate 18 is prevented to adjust the height of the shims. The horizontal level of the pillar is adjusted by the number of the sandwiching plates 22.

When the distance between the two base plates, that is, the mounting horizontal position and height of the column 21, is determined, the temporary bolt 23 is sandwiched between the grooves 38a of the sandwiching plate 38 which is substantially square and has a groove 38a cut from one corner toward the center. Between the base plates at the four corners. After removing the temporary bolts 23, the anchor bolts 24 made of high-strength bolts are inserted into the anchor holes 19 and the through holes 20, and the pile-side base plate 1 is removed.
7 and the column-side base plate 18 are fastened.

Next, a method of erecting columns on two or more adjacent steel pipe piles according to the second aspect will be described.

FIG. 11 is a front view of the embodiment, and FIG. 12 is a plan view of the embodiment. As shown in FIG. 11, two steel pipe piles 40-40 are submerged in the ground by the above-described method, and a pile head cap having a bolt protruded at the center is fitted and welded to the tip of each pile. A two-part pile side base plate 25 is welded to each pile head, and a pillar 26 is erected in the center by welding. A rectangular pillar side base plate 27 having an area between piles 40 and 40 is placed on the bolts. The anchor holes 2 are formed in the pillar side base plate 27 in accordance with the through holes 28 formed in the pile side base plate 25.
Eight holes 9 are drilled, temporary bolts are inserted by aligning the anchor holes 29 and the through holes 28, and a sandwiching plate is inserted between both base plates. While adjusting the height of the pillar 26 with bolts,
The horizontal level of the pillar is adjusted by the number of the sandwiching plates, and when the standing position of the pillar 26 is determined, the sandwiching plate is sandwiched between the base plates so that the temporary bolt is inserted into the groove of the sandwiching plate 30, and then the sandwiching plate is inserted. Then, the temporary bolts are replaced with anchor bolts 31 made of high-strength bolts and inserted into the anchor holes to fasten the pile base plate 25 and the column base plate 27.

In order to erect the column 26 more rigidly, the bottom surfaces of the two or more rib plates 32 are fixed to the surface of the column base plate 27 and the side surfaces of the rib plate 32 are fixed to the side surfaces of the column 26 by welding or bolts. .

Finally, a foundation construction method using a PC pile according to claim 3 will be described.

FIG. 13a shows an end plate 3 made of steel at the pile head.
FIG. 3 is a perspective view of a PC pile 34 to which the third PC 3 is attached. The PC pile 34 is sunk on the ground by the above-described method, and the steel pipe 35 serving as a joint pile for adjusting the height is connected to the end plate 33 as shown in FIG.
It is attached by welding.

Thereafter, similarly, a pile head cap with a bolt protruding is fitted to the steel pipe 35, a pile base plate is attached, the column base plate is placed on the bolt, and a sandwich plate is sandwiched between the base plates. After checking the height and horizontal level of the column, insert the pinch plate between the two base plates at the position where the temporary bolts are inserted, replace the temporary bolts with high-strength bolts, and replace the column base plate and the pile side plate. And a pillar is erected on the PC pile.

Of course, it is also possible to erect a column having a rigid foundation supported by two or more foundation piles according to claim 2 by attaching a column-side base plate extending over two or more adjacent PC piles. It is.

[0036]

The present invention is excellent in terms of environment because it does not generate a large amount of residual soil, noise, dust, etc. due to the conventional building foundation work. 2, the inside of the two temporary wires shown in FIG. 3 indicates the area required for the construction method according to the present invention, and the outside indicates the area required for the conventional foundation work. As is clear from this, according to the construction method of the present application, it is possible to perform building foundation work in a narrow place or an adjacent area. 3. Pillars can be erected immediately after the foundation of steel pipe piles is laid down, eliminating the need for excavation and formwork fitting work required for conventional building foundation work, and eliminating the need for curing time for concrete etc. Therefore, labor and time required for construction can be significantly reduced. 4. By changing the shape and size of the base plate, a rigid foundation consisting of two or more adjacent piles can be formed. 5. The method of the present invention can be applied not only to steel pipe piles or PC piles but also to piles made of other materials.

[Brief description of the drawings]

FIG. 1 is a front view of a building constructed by a construction method according to the present invention.

FIG. 2 is a front view of a building constructed by a conventional method.

FIG. 3 is a plan view of a pillar erected by the method according to the present invention.

FIG. 4 is a plan view of a pillar erected by a conventional method.

FIG. 5 is a perspective view showing a state where the steel pipe pile according to the present invention is laid in the ground.

FIG. 6 is a perspective view showing a state in which a pile head cap is fitted to the cut steel pipe pile.

FIG. 7 is a partial sectional view of the same.

FIG. 8 is a perspective view showing a state where a pile side plate is welded to a steel pipe pile.

FIG. 9 is a perspective view showing a state where a column side plate is placed on a steel pipe pile.

FIG. 10 is a perspective view showing a state in which a steel pipe pile and a column are fastened with anchor bolts.

FIG. 11 is a front view showing a state where one pillar is supported by two steel pipe piles.

FIG. 12 is a plan view of the same.

FIG. 13 a is a perspective view of a PC pile with an end plate attached to the tip. b Perspective view of the PC pile to which the joint pile was welded.

[Explanation of symbols]

6, 40, steel pipe piles 7, 21, 26, pillar 12, pile head cap 13, bolt 14, nut 1
5, Iron ring 16, Backing metal 17, 25, Pile side base plate 18, 27, Column side base plate 1
9, 29, anchor holes 20, 28, through holes 22, sandwiching plate 23, temporary bolts 24, 31, high-strength bolts
30, 38, sandwiching plate 32, rib plate 33,
End plate 34, PC pile 35, joint pile

Claims (3)

(57) [Claims] A steel pipe pile submerged in the ground is cut to a desired length, a pile head cap fitted with a bolt in the center is fitted to the pile tip, and a pile-side base plate having a through hole is provided. After sandwiching the tip, weld it to the tip of the pile, place the pillar-side base plate with the pillar standing on the bolt, and insert the temporary bolt into the anchor hole and through hole drilled in the pillar-side base plate according to the through hole After positioning the pillars by inserting the sandwiching plate between both base plates, sandwiching the temporary bolts with the sandwiched plate with the groove cut out, fastening the base plates with high-strength bolts after removing the temporary bolts, Construction method. 2. A two-part pile base plate having two or more adjacent steel pipe piles cut at a desired length, a pile head cap fitted with a bolt at the center, fitted to the pile tip, and having a through hole. After sandwiching the tip of the pile, it is welded to the tip of the pile, and the pillar-side base plate, which has an area extending over two or more steel pipe piles, with the pillar standing upright, is placed on the bolt and drilled in the pillar-side base plate in accordance with the through hole Temporary bolts are inserted through the anchor holes and through holes that have been inserted, the sandwiching plate is inserted between both base plates, and the pillars are positioned. Construction method of the building foundation which fastens both base plates with bolts. 3. A steel pipe pile having a diameter smaller than the inner diameter of the PC pile is joined to the PC pile submerged in the ground, and after welding to the end plate of the PC pile, the steel pipe pile is used as a joint pile for height adjustment. At the tip, a pile head cap fitted with a bolt at the center is fitted, and the pile tip is sandwiched between two divided pile-side base plates with through holes, then welded to the pile tip, and the pillar side where the pillar is erected The base plate was placed on the bolt, the temporary bolt was inserted into the anchor hole and the through hole drilled in the pillar side base plate in accordance with the through hole, and the pillar was positioned by inserting the sandwiching plate between both base plates. After that, the temporary bolts are sandwiched between pinched plates with grooves cut out, and after removing the temporary bolts, both base plates are fastened with high-strength bolts.