JP4044029B2 - Method of placing a pile formed with a coating material and its pile structure - Google Patents

Description

  The present invention mainly relates to a technique for placing a pile on the site of a management-type waste disposal site, and in particular, a coating material around a pile in order to construct a pile foundation that penetrates a water shielding base without impairing the water shielding function. It is related with the placement method of the pile which formed A, and its pile structure.

In a waste disposal site where industrial waste and general waste are landfilled, contaminated water and harmful substances may be leached from the waste landfilled and stored. This contaminated water and harmful substances may leach into public water areas such as rivers and seas outside the disposal site, or may contaminate groundwater. Therefore, in order to prevent the leaching of the contaminated water, it is necessary that an impermeable formation is present on the side surface or bottom surface of the landfill site. It shall be subjected to.

In sea surface landfill disposal sites, alluvial cohesive soil layers that are naturally distributed along the coast are often used as the water-impervious foundation at the bottom of the disposal site. For example, a viscous soil having a water permeability coefficient of 1 × 10 ⁻⁵ cm / sec needs to have a thickness of 5 m or more.

After landfill is completed, it is hoped that the site of the disposal site can be used effectively and highly while maintaining the soundness of the impervious construction. However, it is necessary to maintain the impervious infrastructure even after the disposal site is abolished. Therefore, it is difficult to drive piles through the impermeable base.

  As shown in Fig. 6, when constructing a new structure 51 such as a building or a bridge as an effective use of the site of the waste disposal site, the pile foundation will be used due to the lack of supporting capacity of the foundation ground of the site of the waste disposal site. May be required. In this case, when the pile 52 is driven to the permeable formation C through the waste layer A and the impermeable base layer B in the disposal site, waste and contaminants are formed on the peripheral surface of the pile 52 as the pile 52 is driven. May adhere and harmful substances may be brought into the impermeable base B and the permeable formation C.

  Moreover, as shown in FIG. 7, after driving the pile 52, a gap is formed between the pile body and the impermeable basement layer B, and contaminated water and harmful substances P are leached out of the disposal site through the gap. There is a fear.

  For this reason, when constructing the structure 51 on the site of the waste disposal site, it is limited to a structure that does not use piles, and the site itself is limited to the use of green spaces and parking lots. The current situation is that advanced and effective use is not being attempted.

As a technique for placing a pile, when placing a pile that penetrates the impermeable layer ground and reaches the lower permeable layer ground in the “pile construction method” of Patent Document 1, Later, a technique for preventing contaminated groundwater in the upper permeable layer ground from flowing into the lower permeable layer ground has been proposed. This is because the upper permeable layer ground inside the pile construction area is replaced with a replacement material, and the contaminants are prevented from entering the center of the pile construction area. This is a method for preventing contamination of clean groundwater contained in the lower permeable layer ground by preventing contaminants contained in the groundwater from penetrating into the lower permeable layer ground.

In addition, in the “pile construction method” of Patent Document 2, it becomes possible to prevent the penetration of pollutants into the lower permeable layer ground, and by filling the space between the placed piles with the above various materials, There has been proposed a technique that prevents contamination of the pile construction area from entering the center of the pile construction area after installation and prevents contamination of clean groundwater contained in the lower permeable layer ground. In this method, by installing an extrapolation tube, infiltration of contaminated groundwater into the pile construction area is prevented, and infiltration of contaminants into the lower permeable layer ground during pile driving is prevented. In addition, by filling the space between the outer cannula and the pile piled up with a filling material, the infiltration of contaminants into the center of the pile construction area after pile driving is prevented, and the clean groundwater contained in the lower permeable layer ground It is intended to prevent contamination.
Japanese Patent Laid-Open No. 11-336060 Japanese Patent Laid-Open No. 11-336073

  However, the conventional pile construction method described above is a complex that prevents the infiltration of pollutants into the center of the pile construction area by replacing the upper permeable layer ground inside the pile construction area with a replacement material during pile construction. The operation process required, and the man-hour of those work had the problem of increasing.

  Also, first install the extrapolation tube, fill the space between the extrapolation tube and the driven pile with the filling material, and prevent the intrusion of contaminants into the center of the pile construction area after the pile placement. Even the pile construction method in which the piles are driven into the pile requires a complicated work process, which increases the number of work steps.

The present invention has been developed to solve such problems. An object of the present invention, to form a film around the pile, by using the outer tube at the time of pouring, Guests do write bring harmful substances from waste deposits into water permeable base layer, contaminated water and toxic substances It is to provide a pile placing method and a pile structure formed with a coating material that enables a pile placement without leaching of the pile and can ensure a predetermined water shielding function even after the placement. .

In the site of the waste disposal site, the present invention provides a pile (from the waste layer (A) on the surface layer to the water-permeable base layer (C) that penetrates the water-impervious base layer (B) such as cohesive soil (C). 1) A driving method for driving in, in which a coating material (2) is formed around the pile (1), and a hollow is previously formed at a position where the pile (1) is driven into the waste layer (A). The outer tube (3) is inserted to a depth deeper than the lower end of the waste layer (A), and then the waste is removed from the inside of the outer tube (3) and washed, and then the outer tube (3) The inside is filled with a water shielding material (4), and then the pile (1) is penetrated into the outer pipe (3) so as to push the water shielding material (4) away, and further, the pile (1) the when to penetrate the water shield base layer (B), the outer tube (3) allowed to remain the waste layer (a), and wherein the pile (1) only of its surface To pouring until said permeable formation (C) to penetrate the water shield base layer (B) so as not to film material (2) is peeled off to form a coating material, wherein the pile Provide a method for placing

Further, the present invention provides a pile from a waste layer (A) on the surface layer to a water-permeable stratum (C) that penetrates a water-impervious base layer (B) such as cohesive soil at a site of a waste disposal site. (1) is a driving-in method in which a coating material (2) is formed around the pile (1), and an outer tube (3) is fastened to the outer periphery of the tip of the pile (1) (6 ) latched with,該杭the pile (1) such that the when to penetrate the waste layer (a), latching the outer tube (3) is penetrated together without being separated together (1) is placed, and then the pile (1) is passed through the waste layer (A) together with the outer tube (3) , and then the locking tool is removed, and the outer tube ( said 3) waste layer (while the pile Ru allowed to remain in a) (1) only the coating material of the surface (2) the water barrier underlying layer so as not to be peeled off ( B) A method for driving a pile formed with a coating material characterized by being inserted into the water-permeable stratum (C) .

Here , it is preferable that the coating material (2) on the surface of the pile (1) penetrated into the impermeable base layer (B) is water-absorbed and swollen in the impermeable base layer (B).

Furthermore, the present invention is driven from the surface waste layer (A) to the water-permeable base layer (C) serving as the supporting ground through the water-impervious base layer (B) such as cohesive soil at the site of the waste disposal site. a pile to be, provided in the so that superimposed on the film material (2) formed around the pile (1), the outer tube latched using removably a fastener (6) (3) The coating material (2) does not peel off when the pile (1) penetrates into the water-impervious base layer (B) and is driven into the water-permeable base layer (C). The outer tube (3) penetrates the waste layer (A) together with the pile (1), but is formed of a material that is easily peeled off at a slow deformation speed. layer (B) the depth is similar surface is separated from the pile (1) by removing the fastener (6), wherein the waste Remaining in the (A), to provide a pile structure formed a coating material, characterized in that.

Here , it is preferable that a flange-shaped reaction force blade (5) is formed on the outer tube (3) around a cylindrical shape on the opposite side to the direction in which the outer tube (3) is placed.

The coating material (2) is a water-absorbing polymer .

According to the above invention, by passing the pile (1) through the outer tube (3) inserted into the waste layer (A) on the surface layer, the pile (1) is contaminated with water or harmful to the waste layer (A). By avoiding contact with the substance, the pile (1) can be prevented from bringing contaminated water and harmful substances in the waste layer (A) into the impermeable base layer (B).

Here, after the placement of the pile (1) is completed, the coating material (2) absorbs and expands by reacting with water in the impermeable base layer (B), and the pile (1) and the impermeable base layer ( A water stop effect can be achieved by filling the gap formed between the B) and B). Furthermore, the coating material (2) can also remove the negative frictional force (negative friction) on the pile (1) against a very slow displacement such as consolidation settlement of the impermeable base layer (B). .

  Moreover, what formed the coating | coated material (2) around the pile (1), and also attached the outer tube | pipe (3) to this coating | coated material (2) is only to lay one pile (1). The outer tube (3) can be penetrated into the site of the waste disposal site without being separated together. After that, the outer tube (3) separated from the pile (1) is left in the waste layer (A), and the coating material (2) of the pile (1) is exposed from the impermeable base layer (B), Hazardous substances can be brought from the waste layer (A) to the impermeable base layer (B), and the pile (1) can be driven without leaching of contaminated water and harmful substances.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
In the placing method of the present invention , a coating material such as a viscous material or a viscous synthetic resin is formed around the pile, and when this pile is placed, it can be placed while protecting the coating material. The outer tube is used. This pile is in the site of the landfill site, the surface of the struck from waste deposits to permeable formations the water shield base layer through the supporting ground as cohesive soil write Murrell is, the time the coating material By protecting the formed pile with an outer pipe, even if the pile is driven through the waste layer and the viscous soil layer, contaminated water and harmful substances in the waste layer are introduced into the impermeable basement layer. It is something that was n’t stopped .

FIG. 1 is a cross-sectional view showing a first embodiment of a pile structure in which the coating material of the present invention is formed. FIG. 2 is an explanatory view showing a first embodiment of a pile placing method in which the coating material of the present invention is formed.
The method for placing a pile formed with a coating material according to the present invention is a water-permeable stratum C that penetrates a wastewater layer A and a water-impervious basement layer B such as cohesive soil at a site of a waste disposal site, and serves as a supporting ground. This is a driving method in which the pile 1 is driven.

The pile 1 of the present invention is not directly driven into the surface waste layer A at the site of the waste disposal site, but a cylindrical outer tube 3 is previously placed in the waste layer A deeper than the lower end of the waste layer A. After removing the waste from the inside of the outer tube 3 and performing internal cleaning, it is driven into the outer tube 3.
The total length of the pile 1 is determined according to the depth from the waste layer A to the impermeable basement layer B and the permeable stratum C in the site of the waste disposal site. For example, the waste layer A is 15 m. When the water-impervious basement layer B is 15 m to 30 m and the water-permeable base layer C is several m into the pile, it is about 30 m to 50 m. Moreover, the diameter of the pile 1 is about 60 cm-150 cm. A coating material 2 is formed on the entire surface of the pile 1. It can form partially with respect to the film | membrane material 2 with respect to the circumference | surroundings of this pile 1. FIG. However, the coating material 2 needs to be formed from the lower end of the pile 1 (tip in the placing direction).

  The cylindrical outer tube 3 is a cylindrical member made of, for example, metal or synthetic resin. The length of the outer tube 3 is determined according to the depth of the waste layer A, and is slightly longer than the depth of the waste layer A. In addition, the inner diameter of the outer tube 3 is preferably slightly larger than the outer diameter of the pile 1 on which the coating material 2 is formed. The outer tube 3 has a function of preventing the pile 1 from coming into contact with the contaminated water and harmful substances of the waste layer A by penetrating the pile 1 inside thereof.

  On the other hand, the coating material 2 absorbs water and expands after an arbitrary time. This coating material 2 also needs to have a strength that does not peel off when the pile 1 is transported and driven. The film material 2 is desirably formed to a thickness of about 5 mm. However, it is needless to say that the film thickness is not limited to this.

  As this coating material 2, there exists what applied the water absorption polymer to the circumference | surroundings of the pile 1, for example. If this pile material 2 forms the material which does not peel when the pile 1 currently laid penetrates the inside of the water-impervious base layer B and is driven into the permeable formation C, such a water-absorbing polymer is used. However, other materials such as a synthetic resin material can be used. In addition, it is not a problem that this film material 2 peels when driving to the water-permeable formation C.

Next, a method for placing a pile on which the coating material configured as described above is formed will be described.
First, as shown in “Outer tube insertion” in STEP 1 of FIG. 2, a hollow outer tube 3 is inserted into the waste layer A to a depth deeper than the lower end of the waste layer A in a place where the pile 1 is placed. After the waste is removed from the inside of the outer tube 3 and washed, a water-impervious material 4 such as clay or clay soil is filled. In addition, the water-impervious material 4 to be filled is not limited to clay and clayey soil as long as it has water-impervious properties.

  The pile 1 is driven so as to push away the water-impervious material 4 in the outer tube 3 as shown in “During viscous clay layer driving” in STEP 2 of FIG. 2. At this time, the outer tube 3 around the pile 1 is left at that position, and the pile 1 is penetrated into the impermeable basement layer B at the same time as the inner impermeable material 4 is pushed away. At this time, the pile 1 and the coating material 2 are penetrated together without being peeled off. Since the pile 1 penetrates the pile 1 inside the outer pipe 3 while pushing away the water shielding material 4 in the outer pipe 3, the pile 1 does not come into contact with the contaminated water and harmful substances in the waste layer A. .

  Lastly, as shown in STEP 3 of FIG. 2 “Placement completion, consolidation settlement”, the impermeable base layer B is consolidated, and the waste layer A and the impermeable base layer B sink at a very low speed. In this case, the frictional (viscous) resistance between the inner coating material 2 and the impermeable base layer B, the waste layer A and the outer coating material 3 is won by the adhesion between the pile 1 and the inner coating material 2, and the pile 1 The inner coating material 2 is peeled off and no negative friction is applied to the pile 1.

  When a water-absorbing polymer is applied to the coating material 2, the coating material 2 in the pile 1 that has passed through the impermeable base layer B is absorbed and swollen in the impermeable base layer B. Thereby, the clearance gap produced between the pile 1 and the water-impervious base layer B can be produced, and a water stop effect can be produced.

FIG. 3 is a cross-sectional view showing a second embodiment of a pile structure in which the coating material of the present invention is formed. FIG. 4 is an explanatory view showing a second embodiment of a method for placing a pile formed with a coating material of the present invention. In the pile placing method of the first embodiment described above, the outer tube 3 is inserted into the waste layer A in advance, and the pile 1 is inserted into the outer tube 3.
However, as in the present embodiment, it is also possible to use the one in which the coating material 2 is formed around the pile 1 and the outer tube 3 is attached to the coating material 2 and integrated. That is, when the pile 1 is penetrated through the waste layer A, the outer tube 3 can be integrally penetrated so as not to be separated from the pile 1.

  In the outer tube 3 attached to the pile 1 in the second embodiment, a flange-shaped reaction force wing 5 is formed around a cylindrical shape on the opposite side to the direction in which the pile 1 is placed. The reaction force blade 5 functions as a stopper when the outer tube 3 is inserted into the waste layer A. This can prevent the outer tube 3 from being inserted into the waste layer A unnecessarily deeply.

FIG. 5 is a cross-sectional view of a locking tool for attaching the outer tube to the pile, and the outer tube 3 can be hooked to the tip of the pile 1 by the locking tool 6.
When penetrating the outer tube 3 together with the pile 1 into the waste layer A, the pin-like locking tool 6 can be inserted and removed from the through hole 7 opened at the tip of the pile 1 into the through hole 8 opened also in the outer tube 3. When the outer tube 3 penetrates to a depth deeper than the lower end of the waste layer A, the outer tube 3 can be left in the waste layer A by removing the locking tool 6. Needless to say, the shape of the locking member 6 and the arrangement of the through holes 7 and 8 are not limited to the illustrated examples.

Next, a method for placing a pile formed with the coating material configured as described above will be described in more detail with reference to FIG.
First, as shown in “Before placing” in STEP 1 of FIG. 4, the outer tube 3 is attached to the pile 1 having the coating material 2 formed around it.

Then, as shown in “Waste layer is being placed” in STEP 2 of FIG. 4, the pile 1 to which the outer tube 3 is attached is placed on the waste layer A together with the outer tube 3 and the coating material 2. At this time, the outer tube 3 and the pile 1 are integrated into the waste layer A.

Next, as shown in “During the viscous soil layer placement” in STEP 3 in FIG. 4, only the pile 1 on which the coating material 2 is formed is penetrated into the impermeable basement layer B by removing the locking tool 6. To be placed. The outer tube 3 around the pile 1 remains at that position, and only the pile 1 is driven into the impermeable basement layer B. At this time, the coating material 2 is not peeled off from the pile 1 and penetrates as a whole. Since the pile 1 penetrates the inside of the outer tube 3, the pile 1 does not come into contact with the contaminated water or harmful substances in the waste layer A.

Finally, as shown in STEP 4 of FIG. 4 “Completion of casting and consolidation settlement”, the impermeable base layer B is consolidated, and the waste layer A and the impermeable base layer B sink at a very low speed. When the pile 1 and the inner coating material 2 are adhered, the friction (viscous) resistance between the inner coating material 2 and the impermeable base layer B, the waste layer A and the outer coating material 3 wins, and the pile 1 The inner coating material 2 is peeled off from the pile, and the negative friction is not applied to the pile 1.

  When a water-absorbing polymer is applied to the coating material 2, the coating material 2 in the pile 1 that has passed through the impermeable base layer B is absorbed and swollen in the impermeable base layer B. Thereby, the clearance gap produced between the pile 1 and the water-impervious base layer B can be produced, and a water stop effect can be produced. The coating material 2 can also swell and absorb water in the water-permeable base layer C.

  In the present invention, the outer tube 3 is left in the waste layer A, and the pile 1 is passed through the outer tube 3, whereby the pile 1 comes into contact with the contaminated water and harmful substances in the waste layer A. As long as this pile 1 is a method for preventing the contaminated water and harmful substances in the waste layer A from being brought into the impermeable basement layer B, the pile 1 is not limited to the embodiment of the invention described above. Of course, various changes can be made without departing from the scope of the present invention.

  In the present invention, even if a pile is pierced through the waste layer and the impermeable basement layer at the site of the disposal site, no harmful substances in the waste layer are introduced, so the impermeable construction of this disposal site It is possible to achieve effective and advanced use of the disposal site while maintaining the soundness of the site.

  After the completion of pile driving, the coating material absorbs water and expands by reacting with water in the impermeable basement layer, creating a gap between the pile and the impermeable basement layer, and exerts a water blocking effect Since it is possible to prevent the contaminated water from leaching out of the disposal site through the gap between the pile and the impermeable base layer, even when constructing a structure at the site of the waste disposal site It can be constructed in a structure using piles, and the advanced and effective use of the site can be achieved.

  In addition, the coating material can also remove negative frictional force (negative friction) against the pile against a very slow displacement such as consolidation settlement of the impermeable base layer.

It is sectional drawing which shows the 1st Example of the pile structure in which the film material of this invention was formed. It is explanatory drawing which shows the 1st Example of the placement method of the pile which formed the film material of this invention. It is sectional drawing which shows the 2nd Example of the pile structure in which the film material of this invention was formed. It is explanatory drawing which shows the 2nd Example of the placement method of the pile which formed the film material of this invention. It is sectional drawing which shows the latching tool which attaches an outer shell pipe to a pile. It is explanatory sectional drawing which shows the state which constructs new structures, such as a building and a bridge, as effective use of the site of a waste disposal site. It is explanatory sectional drawing which shows the state which a waste and a pollutant adhere to a pile surrounding surface with the placement of a pile in the site of a waste disposal site, and a toxic substance is brought out of the impermeable base and the impermeable base.

Explanation of symbols

1 Pile (pile structure)
2 Coating material 3 Outer tube 4 Water shielding material (cohesive soil)
5 Reaction force wing 6 Locking tool A Waste layer B Impermeable base layer C Permeable formation

Claims (6)

At the site of the waste disposal site, the pile (1) is driven from the surface waste layer (A) through the water-impervious base layer (B) such as cohesive soil to the permeable stratum (C) that becomes the supporting ground. A placement method,
Form a coating material (2) around the pile (1),
In the place where the pile (1) is placed in the waste layer (A), a hollow outer tube (3) is inserted in advance to the depth below the lower end of the waste layer (A),
Next, after removing the waste from the inside of the outer tube (3) and cleaning the inside, the outer tube (3) is filled with a water shielding material (4),
Thereafter, the pile (1) penetrates the outer pipe (3) so as to push away the water shielding material (4), and further penetrates the pile (1) into the water shielding base layer (B). when to be, the outer tube (3) allowed to remain in the waste layer (a), and the like without the coating material of the pile (1) only the surface (2) is peeled off Penetration into the impermeable basement layer (B) and driving to the water permeable formation (C),
A method for placing a pile on which a coating material is formed. At the site of the waste disposal site, the pile (1) is driven from the surface waste layer (A) through the water-impervious base layer (B) such as cohesive soil to the permeable stratum (C) that becomes the supporting ground. A placement method,
A coating material (2) is formed around the pile (1), and the outer tube (3) is hooked on the outer periphery of the tip of the pile (1) using a locking tool (6) ,
When passing the said pile (1) in the waste layer (A), and Da設the該杭(1) as latching the outer tube (3) is penetrated together without being separated together ,
Next, after passing the pile (1) through the waste layer (A) together with the outer tube (3), the locking tool is removed, and the outer tube (3) is turned into the waste layer (A). the one wherein the pile Ru allowed to remain only (1) so as not to coat material of the surface (2) is peeled off to penetrate into water-impervious base layer (B), hit until said permeable formations (C) Set up,
A method for placing a pile on which a coating material is formed.   The coating material according to claim 1 or 2, wherein the coating material (2) of the pile (1) penetrated through the impermeable base layer (B) is water-absorbed and swollen in the impermeable base layer (B). A method of placing piles that have formed. At the site of the waste disposal site, it is a pile that is driven from the surface waste layer (A) through the water-impervious base layer (B) such as cohesive soil to the water permeable layer (C) that becomes the supporting ground. ,
In the so that superimposed on the film material (2) formed around the pile (1), provided with stop was shell tube (3) multiplied with the insertion freely fastener (6),
The coating material (2) does not peel off when the pile (1) penetrates into the water-impervious base layer (B) and is driven into the water-permeable base layer (C), and is very slow like consolidation settlement. For the deformation speed, it is formed of a material that is easily peeled off.
The outer tube (3) penetrates the waste layer (A ) together with the pile (1), but the surface of the impermeable base layer (B) is similar to the surface by removing the locking tool (6). A pile structure formed with a coating material characterized by being separated from the pile (1) and remaining in the waste layer (A). The coating film according to claim 4, wherein a flange-shaped reaction force wing (5) is formed on the outer tube (3) around a cylindrical shape opposite to the direction in which the outer tube (3) is placed. Pile structure with material. The pile structure according to claim 4 , wherein the coating material (2) is a water-absorbing polymer.

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