JP2005350958A - Treating method for pile head extra-banking part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treating method for a pile head extra-banking part considering environment in regard to mixed waste disposal without disturbing sound concrete in a pile head lower layer part besides removing extra-banking concrete around a steel column easily at a low cost. <P>SOLUTION: Underground steel column construction 1 which is cross H-shape steel of combined shape of two H-shape steel so that a web part is cross-shaped in the top cross-sectional view, is erected in a pile head part along the center axis of a cast-in-place concrete pile 6. A treatment sheet 3 is mounted to the inner peripheral surface of each recessed part 2 partitioned by webs 1w and flanges 1f constituting underground steel column construction 1, with an adhesive tape 4 so that the lower edge of the treatment sheet 3 is positioned about 50-100 mm above the designed pile top end and that a clearance 3a is formed at a corner part where the web 1w and flange 1f or the web 1w and web 1w intersect. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pile head surplus portion processing method for crushing and removing surplus concrete at a pile head when constructing a cast-in-place concrete pile having a structural pillar.

In the construction of cast-in-place concrete piles, mud, slime, etc. concentrate on the pile head and the quality of the concrete deteriorates. Therefore, about 500-800mm extra concrete (extra-concrete concrete) is cast from the top of the design pile. Pile quality is ensured by scooping and removing excess concrete after hardening. However, the work of grinding the surplus concrete requires considerable labor and is accompanied by noise and vibration. In particular, when a built-up column made of H-shaped steel or cross H-shaped steel is installed in a cast-in-place concrete pile, surplus concrete around the built-up column must be removed, and this work takes a lot of time. And have to spend effort.
For this reason, measures have been taken to fit the edge cutting material formed of a sandbag or foamed polystyrene into the concave portion of the structural pillar, thereby eliminating the concave portion (see, for example, Patent Documents 1 and 2).
JP-A-6-264441 (page 2-3, FIG. 1) Japanese Patent Laid-Open No. 10-29879 (page 2-3, FIG. 1)

However, in the conventional method, the material cost of the edge cutting material and the mounting cost of the edge cutting material are increased, and the edge cutting material is mixed with the extra-concrete concrete during the surfacing work of the extra-concrete, and becomes mixed waste. There is a problem that separation collection is difficult. In addition, when inserting a structural pillar into a pile after placing the concrete, the edge cutting material presses the extra concrete mixed with mud and slime downward from above. There is also a risk of being disturbed.
The present invention has been made in view of the above-mentioned problems, and it is possible to easily and inexpensively remove surplus concrete around the built-up column, and without disturbing the sound concrete in the lower part of the pile head, mixing and discarding The purpose of this project is to provide an environment-friendly pile head surplus treatment method for disposal of materials.

In order to achieve the above object, in the pile head surplus part processing method according to the present invention, when constructing a cast-in-place concrete pile having a built-up column, a pile head surplus part for crushing and removing the surplus concrete of the pile head In the processing method, a treatment sheet formed by foaming a biodegradable plastic into a sheet before the construction pillar is covered with surplus concrete is formed on at least a corner of the inner peripheral surface of the construction pillar recess. It mounts beforehand so that a space | gap may be formed in a corner | angular part, After the surplus concrete of the said recessed part hardens | cures, the said surplus concrete is crushed and removed, It is characterized by the above-mentioned.
Here, the biodegradable plastic is a plastic that is decomposed into carbon dioxide or water by the action of microorganisms that inhabit the soil or water. In addition, the concave portion is defined by a steel plate such as a web or a flange constituting the structural pillar as viewed from the material axis direction of the structural pillar, and a part of the periphery is open to the outside. That is.

In the present invention, since the treatment sheet formed by foaming biodegradable plastic is formed in advance on the inner peripheral surface of the structural pillar recess, the surplus concrete and the structural pillar of the structural pillar recess are The edge is cut off, and the surplus concrete in the concavity can be easily crushed and removed. As a result, it is possible to improve the construction efficiency, shorten the construction period, and reduce noise and vibration. In addition, since the processing sheet is mounted so that a gap is formed at least in the corner portion, rather than closely contacting the inner peripheral surface of the corner pillar recess, the edge cutting effect between the surplus concrete and the corner pillar is further enhanced. be able to.
In addition, since biodegradable plastics are finally decomposed into carbon dioxide and water in the soil, there is no need to separate and collect the treated sheet as industrial waste, which is an environmentally friendly method.
Furthermore, in the present invention, the treatment sheet is a simple sheet formed by foaming a biodegradable plastic, so that the treatment sheet can be manufactured at a low cost and the treatment sheet can be easily mounted without any trouble. As a result, installation costs can be greatly reduced.
In addition, in the present invention, since the treatment sheet is thin, it is possible to install the structural pillar without disturbing the sound concrete of the pile head like a conventional edge cutting material.

Moreover, in the pile head surplus part processing method which concerns on this invention, you may wind the said process sheet | seat around the outer peripheral part of the said structure pillar.
In the present invention, since the treatment sheet is pre-wound around the outer periphery of the true pillar in addition to the inner peripheral surface of the true pillar recess, the extra concrete and the true pillar in the true pillar recess and the outer periphery of the true pillar The edges are cut off, and it becomes easy to crush and remove the extra-concrete in the built-up column recess and the built-up column outer periphery.

Moreover, in the pile head surplus part processing method which concerns on this invention, when constructing the cast-in-place concrete pile which has a construction pillar, it is the pile head surplus part processing method which crushes and removes the surplus concrete of a pile head, Before the structural pillar is covered with extra-concrete concrete, a treatment sheet formed by foaming biodegradable plastic into a sheet shape is wound around the outer periphery of the structural pillar in advance, and the extra-concrete concrete is After hardening, the extra concrete is crushed and removed.
In the present invention, since the treatment sheet is pre-wrapped around the outer peripheral portion of the true pillar, the edge of the extra concrete on the outer periphery of the true pillar and the true pillar is cut off, and the extra concrete on the outer periphery of the true pillar is crushed. Removal is easy.

Moreover, in the pile head surplus part processing method which concerns on this invention, what is necessary is just to mount | wear and fix the said processing sheet to the said construction pillar with the adhesive tape which apply | coated the adhesive material to the tape-shaped biodegradable plastic.
In the present invention, since the processing sheet is mounted and fixed to the stem column using an adhesive tape obtained by applying an adhesive material to a tape-like biodegradable plastic, the mounting operation of the processing sheet can be performed more easily and reliably. However, since the adhesive tape will naturally disappear, it is not necessary to separate and collect the adhesive tape as industrial waste.

  According to the present invention, a treatment sheet formed by foaming a biodegradable plastic and formed into a sheet shape is mounted in advance on the inner peripheral surface of the prismatic recess so that a gap is formed at least at the corner, or In addition, by pre-wrapping the processing sheet around the outer periphery of the structural pillar, the surplus concrete around the structural pillar can be removed easily and inexpensively, and the mixed concrete is discarded without disturbing the sound concrete in the lower part of the pile head. It is possible to realize an environment-friendly pile head surplus disposal method for material disposal.

Hereinafter, an embodiment of a pile head surplus part processing method concerning the present invention is described based on a drawing.
FIG. 1 is a perspective view showing a first embodiment of a pile head surplus portion processing method according to the present invention. FIG. 2 is a vertical sectional view and a plan sectional view of the same embodiment.
As shown in FIGS. 1 and 2, the structural pillar 1 is a cross H-shaped steel having a shape in which two H-shaped steels are combined so that the web part has a cross shape in a plan view, It is built into the pile head along the central axis of the cast-in-place concrete pile 6.
On the inner peripheral surface of each recess 2 defined by the web 1w and the flange 1f constituting the structural pillar 1, the lower edge of the treatment sheet 3 is positioned at a position of about 50 to 100 mm above the design pile top end. In addition, the treatment sheet 3 is attached by the adhesive tape 4 so that a gap 3a is formed at a corner where the web 1w and the flange 1f or the web 1w and the web 1w intersect.

The treatment sheet 3 has a biodegradable plastic as a main component and is foamed at a foaming ratio of about 10 times to form a long sheet having a thickness of about several mm and a width of about 800 mm.
The adhesive tape 4 is obtained by applying an adhesive material to a biodegradable plastic film having a thickness of about several hundred μm, a maximum width of about 200 mm, and a maximum length of about 200 mm.

  The gap 3a at the corner is closed with adhesive tape 4 so that extra concrete 5 does not enter, or after inserting the remaining material of the processing sheet 3 while rolling it, the end of the processing sheet 3 is attached with the adhesive tape 4 Fix it.

For the construction of the structural pillar 1 in the pile 6, the structural pillar 1 may be set in the center of the pile 6 in advance before placing concrete, or concrete is placed in the pile 6. Alternatively, the concrete pillar 1 may be inserted and set in the center of the pile 6 before the concrete is hardened.
Then, when the concrete is hardened, the surplus concrete 5 is crushed with a breaker so as to be peeled off from the upper and side surfaces of the surplus concrete 5 on the surface of the treatment sheet 3 in the same manner as a general pile heading method. Just do it.

In the pile head surplus portion processing method according to the present embodiment, a treatment sheet 3 formed by foaming biodegradable plastic and formed into a sheet shape is attached in advance to the inner peripheral surface of the prism 1 recess 2 with an adhesive tape 4. Therefore, the edge of the extra-concrete 5 and the built-up pillar 1 in the concave column 1 recess 2 is cut off, and the extra-concrete concrete 5 in the true column 1 recess 2 can be easily crushed and removed. As a result, it is possible to improve the construction efficiency, shorten the construction period, and reduce noise and vibration. In addition, since the processing sheet 3 is not closely attached to the inner peripheral surface of the construction pillar 1 recess 2 but is mounted so that a gap 3a is formed at least in the corner portion, the extra concrete 5 and the construction pillar 1 The edge cutting effect can be further enhanced.
In addition, since the biodegradable plastic is finally decomposed into carbon dioxide and water in the soil, there is no need to separate and collect the treatment sheet 3 as industrial waste, which is an environmentally friendly method. Since the adhesive tape 4 will naturally disappear, it is not necessary to separate and collect the adhesive tape 4 as industrial waste.
Furthermore, in the pile head surplus part processing method by this embodiment, since the process sheet 3 foams a biodegradable plastic and shape | molds it in the mere sheet form, it can be manufactured cheaply, and also the process sheet 3 Installation work can be done easily and without any trouble, so the installation cost can be greatly reduced.
In addition, in the pile head surplus part processing method by this embodiment, since the process sheet 3 is thin, the frame pillar 1 is installed without disturbing the healthy concrete of a pile head like the conventional edge cutting material. It becomes possible.

FIG. 3 is a perspective view showing a second embodiment of the pile head surplus portion processing method according to the present invention.
As shown in FIG. 3, in this embodiment, in addition to the first embodiment, a treatment sheet 7 is wound around the outer periphery of the structural pillar 1 and fixed with an adhesive tape 4.

  In the pile head surplus portion processing method according to the present embodiment, since the processing sheet 7 is wound around the outer periphery of the stem 1, in addition to the effects of the first embodiment, the surplus of the stem 1 outer periphery. The edge of the built-up concrete 5 and the built-up pillar 1 is cut, and the surplus concrete 5 on the outer periphery of the built-up pillar 1 is easily crushed and removed.

FIG. 4 is a perspective view showing a third embodiment of the pile head surplus portion processing method according to the present invention. FIG. 5 is an elevational sectional view and a planar sectional view of the same embodiment.
As shown in FIGS. 4 and 5, in this embodiment, unlike the first and second embodiments, an H-section steel is used for the structural pillar 11.
On the inner peripheral surface of each recess 12 defined by the web 11w and the flange 11f constituting the structural pillar 11, the lower edge of the processing sheet 13 is positioned about 50 to 100 mm above the design pile top end. In addition, the processing sheet 13 is attached by the adhesive tape 14 so that a gap 13a is formed at the corner where the web 11w and the flange 11f intersect.

FIG. 6: is a perspective view which shows 4th embodiment of the pile head surplus part processing method which concerns on this invention.
As shown in FIG. 6, in addition to the third embodiment, a treatment sheet 17 is wound around the outer periphery of the structural pillar 11 and fixed with an adhesive tape 14.

  The pile head surplus part processing method by 3rd and 4th embodiment also has the same effect as the pile head surplus part processing method by 1st and 2nd embodiment.

  As mentioned above, although embodiment of the pile head surplus part processing method concerning this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, in the above-described embodiment, an example in which a cross H-section steel and an H-section steel are used as the structural pillar is shown, but it goes without saying that a structural pillar having another shape may be used. Alternatively, the processing sheet may be wound around the outer peripheral portion of the structural pillar without mounting the processing sheet on the inner peripheral surface of the concave portion of the structural pillar. In short, it is only necessary to select a method for attaching the processing sheet according to the shape and cross-sectional dimensions of the true pillar.

It is a perspective view which shows 1st embodiment of the pile head surplus part processing method which concerns on this invention. It is a vertical sectional view and a plane sectional view. It is a perspective view which shows 2nd embodiment of the pile head surplus part processing method which concerns on this invention. It is a perspective view which shows 3rd embodiment of the pile head surplus part processing method which concerns on this invention. It is a vertical sectional view and a plane sectional view. It is a perspective view which shows 4th embodiment of the pile head surplus part processing method which concerns on this invention.

Explanation of symbols

1,11 True column 2,12 Recess 3,7,13,17 Treatment sheet 4,14 Adhesive tape 5,15 Extra pile 6,16 Cast-in-place concrete pile

Claims (4)

A pile head surplus portion processing method for crushing and removing pile head surplus concrete when constructing a cast-in-place concrete pile with a structural pillar,
Before the built-up column is covered with surplus concrete, a treatment sheet formed by foaming biodegradable plastic into a sheet shape is formed with a gap at least in the corners on the inner peripheral surface of the built-up column recess The pile head surplus part processing method characterized by mounting | wearing beforehand so that the surplus concrete of the said recessed part may harden | cure and removing the said surplus concrete.   The pile head surplus portion processing method according to claim 1, wherein the processing sheet is wound around an outer peripheral portion of the structural pillar in advance. A pile head surplus portion processing method for crushing and removing pile head surplus concrete when constructing a cast-in-place concrete pile with a structural pillar,
Before the built-up pillar is covered with the extra-concrete concrete, a treatment sheet formed by foaming biodegradable plastic into a sheet shape is wound in advance on the outer periphery of the true-post pillar, and the extra-concrete concrete is cured. Then, the pile head surplus part processing method characterized by crushing and removing the surplus concrete.   The pile head surplus according to any one of claims 1 to 3, wherein the treatment sheet is mounted and fixed to the stem column by an adhesive tape obtained by applying an adhesive material to a tape-like biodegradable plastic. Fill section processing method.

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