JPS6078015A - Construction of custom-made coated pile - Google Patents

Abstract

PURPOSE:To construct a custom-made coated pile without causing any damage to the coated layer by a method in which the ground is excavated, a casing is penetrated, stumbled and cobble stones are removed to the ground's surface, a custom-made coated pile is inserted into the casing, and a solidifying agent, etc., is packed into the surrounding space of the pile. CONSTITUTION:The ground 1 of stratum 1a mixed with stumbled stones, etc., or gravel layer is excavated by a screw auger with the outersertion of casing 2. The auger is pulled up to the ground's surface, soil and sand in the casing 2 are discharged, a custom-made coated pile A with the insertion of a penetrator 6 with an excavating head 6a is inserted into the casing 2 and operated, and the pile A is penetrated. When the tip of the pile A reaches a given depth, a foot protecting liquid, e.g., cement milk, etc., is injected from the portion of the tip 6a to form foot protecting portion 11, and the penetrator 6 is pulled up. The casing 2 is pulled out, and a solidifying or filling material 12, e.g., sand, etc., is packed into the surrounding space of the pile A.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a so-called ready-made coated pile in which the peripheral surface of the pile is coated with asphalt or other bituminous material for the purpose of reducing negative frictional force, without damaging the coated coating layer. This invention relates to a method for constructing ready-made coated piles for reliable and easy construction on a predetermined ground.

Conventionally, when foundation piles are driven into soft ground that is susceptible to subsidence and structures are built on top of them, the foundation pile bearing capacity is provided not only by the pile tip but also by the frictional force between the pile and the ground. However, after the construction of the structure, consolidation and subsidence of the surrounding ground progress and a negative frictional force (frictional force in the opposite direction) acts on the foundation pile, which causes a higher than expected load to be applied to the foundation pile and damage the foundation. It is well known that the piles are damaged and the structure is also seriously damaged.

As a measure to prevent such accidents, the following foundation piles have recently been researched and developed for the purpose of reducing negative frictional force.

For example, the main types are steel pipe piles or concrete piles whose entire or part of the peripheral surface is coated with bituminous material such as asphalt as shown in Figure 1 [A], and In the same figure, the coated employee layer (b) is covered with a protective layer (C) made of plastic, etc.
) are used. However, these existing coated piles are intended only for the purpose of cutting static negative friction forces, assuming that the impact method is the usual pile construction method. In the case of the driving method, even if construction could be carried out without peeling or deforming the coated coating layer (b) or the protective layer (CJ), in the method of constructing the pile by static press-fitting without noise and vibration, The applied coating layer (1) etc. is deformed during press-fitting due to the friction of surrounding earth and sand, etc.
In particular, in sandy and gravel layers that are difficult to construct using hammer, vibro, etc. hammer methods, or in strata containing boulders and cobbles, the deformation and peeling of the coated coating layer described above may be significant, and It was completely impossible to carry out construction without damage, without photography, and without noise, and the intended purpose of reducing negative frictional force could not be completely achieved.

In view of the above, the present invention has been made to allow ready-made coated piles to be easily and reliably constructed without fear of damage to the coated coating layer, etc., especially in the ground where there is a gravel layer, a stratum mixed with boulders, etc.

That is, in the present invention, when constructing a ready-made coated pile whose circumferential surface of the pile is coated with Rinseikan or the like on the ground where there is a gravel layer or a stratum mixed with boulders, cobbles, etc., first, the sand and gravel layer, boulders, etc. A screw auger with a casing extrapolated into the ground, such as a geological formation, was used to dig a hole, and once the hole had been dug to a predetermined depth, the casing was left in the ground and the screw auger was pulled to the surface. After that, a ready-made coated pile with a hole press-fitting means inserted therein is inserted into the casing, and the hole press-fitting means rotated by a drive motor further drills and press-fits the pile into the ground below the casing. When the casing reaches a predetermined depth, a hardening liquid is injected into the tip of the pile, the hole press-in means is pulled down to the ground, and the MiJ casing is pulled out and a hardening agent or sand is applied to the area around the pile. It is characterized by being filled with replenishment material.

Next, embodiments of the invention construction method for ζζ wood will be explained with reference to FIGS. 2 to 5 together with the equipment used.

In the figure, (1) is the ground containing a gravel layer or a stratum (1a) mixed with boulders, boulders, etc. (~ is a ready-made coated material coated with asphalt or other bituminous material on the peripheral surface of the pile body (a)) Showing the pile, the ready-made coated pile (A) is in the ground)
It is constructed as follows.

First, as shown in Figure 2, a stratum containing sand and gravel, boulders, etc. (1a) is formed.
A hole is excavated in the ground (1) using a screw auger (3) fitted with a casing (2) made of steel pipe or the like. In this case, the casing (2) may be press-fitted while being connected to the upper drive motor (4) via the rotation transmission means (5) and rotating in the opposite direction to the screw auger (3) as shown in the figure. , it is also possible to simply connect it to the drive motor (4) and press-fit it without rotating it. Also, the casing (2)
The compression length, that is, the depth of the borehole, is determined by the fact that the tip of the casing (2) is at the bottom of the ground echo (IA) mixed with sand and gravel layer, boulders, etc., or its F.
Therefore, it is necessary to avoid strata mixed with sand and gravel, boulders, etc.
The casing length is set to approximately correspond to the depth of 1a).

If the hole is dug to the specified depth as described in 1.
Leave the casing (2) underground and use the screw auger (
3) is lifted to the ground, and the earth and sand inside the casing, that is, the earth and sand between the screw blades, is discharged to the ground.

After that, as shown in Fig. 3, for example, the tip of the drilling head (
Insert the ready-made coating hole (5) into which the borehole press-fitting means (6) such as an auger (6a) with X is inserted into the casing (2), The borehole press-fitting means (6) is rotationally driven by the rotational transmission, and the casing (
While digging a hole further into the ground below 2), press in 1) IJ pile n4. On this occasion,
The excavation head (6a) of the borehole press-fitting means (6) is
As shown in Fig. 7 and enlarged in Fig. 7, the enlarged blade (7) opens and closes using the support pin (13) as a fulcrum by rotating in the forward and reverse directions, that is, the enlarged blade (7) expands in the normal direction (solid line) and contracts in diameter (dashed line) in the reverse direction. The head structure may be such that the enlarged blade (A+) is engaged with the engagement protrusion (8) welded to the tip of the enlarged blade (A+), and the stake (A+) is rotated together and press-fitted (14). ) is the enlarged blade (
7) is the support part, and (15) shows the stopper of the enlarging blade (7). Alternatively, the drive motor (4) on one side of the pile may be provided with a winding device (9) as shown in the figure, and the pile may be press-fitted by applying a lower force to the winding force of the Lifan Wangki drum. Furthermore, if the pile resistance is large, use the nozzle part (16) at the tip of the excavation head (6a) to discharge hentonite, etc., to loosen the ground and make it easier to dig the hole. In order to prevent damage due to contact with the outer circumferential surface of the pile or the inner circumferential surface of the casing when penetrating into the casing (2), a steady rest piece (10) is installed at the appropriate place such as the end of the pile at the required shedding interval. It is desirable to have multiple roads in the area.

In this way, the ready-made coated resistance is press-fitted to a predetermined depth by adding appropriate piles and shaft pipes of the borehole press-in means as shown in Figure 3 as necessary, so that the tip of the pile is at a predetermined depth such as the support layer. When this is achieved, as shown in Figure 4 (6), cement milk, mortar, or other hardening liquid is injected from the excavation head (5) at the tip of the hole press-in means (6) to harden the tip of the pile. At the same time, the hole press-fitting means (6)
Subtract 2 and subtract 2 from the ground. (11) indicates the hardening section.

Furthermore, the initially cast casing (2) is raised above the ground by connecting it to a drive motor and rotating it, by applying vibrations with a vibro machine, or by simply suspending it with a machine wire. At the same time, fill the surrounding area of the pile with supplementary material (I21) as appropriate (Fig. 5). For example, when extracting the casing (ii (not shown) cement milk to solidify the pile circumference and the ground;
Inject a hardening agent such as mortar. Alternatively, it is also possible to fill the casing with a supplementary material (12), such as sand, after taking it out.

1, according to the present invention, a hole is drilled in advance in the ground where the ready-made coated pile is to be installed, the casing is press-fitted, and boulders, boulders, etc., which are difficult to press-fit the coated pile, are removed. After removal from the ground, the coated piles are inserted into the casing for construction, which not only makes it easy to press the piles into the ground in the -F direction from the lower end of the casing, but also prevents damage to A-holes, cobblestones, etc. on the outer wall of the casing. It can be reliably press-fitted and installed without collapsing or falling, causing deformation, peeling, or damage to the coated surface, and can be installed without impairing the performance of ready-made coated resistors that reduce negative frictional force.

In particular, when press-fitting ready-made burlap piles using a hole press-fitting means with an enlarged blade, since the pile is rotated and press-fitted, it is easy to press-fit it downwards into the casing, and the enlarged blade can be used from the outside diameter of the coating. If a protruding material is used, the outer circumference of the pile will have to be excavated, so contact between the coated surface and the hole wall can be minimized.
Damage to the image cloth surface is further reduced.

[Brief explanation of drawings]

Figures 1 (a) and (b) are partially longitudinal front views illustrating ready-made coated pits, Figures 2 to 5 are cross-sectional views showing two states, and Figure 6 is an enlarged portion of the excavation head. i, I′:,
The top view and FIG. 7 are cross-sectional views taken along the previous line ■-■I. Δ)...ready-made coated pile, (al pile body, (1))...
Application coating layer, FC+/protective layer, (1)...ground, (1a
)...Sand layer or stratum mixed with rolled stones, etc., (2)...
Casing, (3)...Screeny auger, (4)
・・Drive motor, (6) ・・Drilling hole press-fitting means, (11)
・・Root hardening part, mouth z・・Replenishment material. Patent applicant: Attaché Co., Ltd. Agent: ゝ [B i −+ 1″,, 1 and others □ Name ゛− Figure 1

Claims (1)

[Claims] 1. When constructing ready-made coated piles coated with A Yougetsu on the surrounding surface of the pile, in the ground where there is a sandy gravel layer or a stratum mixed with boulders, cobbles, etc., first, the ground is coated with a sandy gravel layer or a stratum mixed with boulders, etc. A hole is dug using a screw auger with a casing inserted into it, and once the hole has been dug to a predetermined depth, the casing is left in the ground and the screw auger is pulled up to the ground, and the earth and sand inside the casing are discharged, and then the hole is press-fitted. A ready-made coated pile with a means inserted therein is inserted into the casing, and the pile is press-fitted while further digging into the ground below the casing by the hole press-fitting means rotated by a drive motor, until the tip of the pile reaches a predetermined depth. For example, injecting a root hardening solution into the tip and lifting the bore hole press-fitting means above the ground;
A method for constructing a ready-made coated pile, further comprising the step of extracting the casing and filling the surrounding area of the pile with a supplementary material such as a consolidation agent or sand.