JP2003221828A - Burying method for prefabricated pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burying method for a prefabricated pile capable of effectively compacting a filler in a simple structure and facilitating the top end management of a pile and positioning of the center core and further, securely obtaining an expected supporting force. <P>SOLUTION: The filler 3 is disposed in the gap between the hole wall of an excavated hole 2 and a pile to build up the pile 4. In this burying method of a prefabricated pile, a filler 3 is cast in the excavation hole 2 to fill the hole 2 and the pile 4 on the outer peripheral face of which protrusions 41 are formed, is pressed in. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for burying ready-made piles (hereinafter, simply referred to as "pile" in the present specification), and in particular, a filler such as slag, gravel, or crushed stone is used to fill piles and hole walls. Fill the space between them and compress the ground that is likely to be liquefied to improve the ground.In particular, use a slag that has expansiveness and solidification as the filling material, and compact the slag so that it surrounds the outer periphery of the pile. The present invention relates to a method for burying ready-made piles in which a slag is expanded and solidified by a hydration reaction so that a pile body integrated with a pile can be constructed.

[0002]

2. Description of the Related Art For example, as disclosed in Japanese Patent Application Laid-Open Nos. 11-209976 and 11-209973, the applicant of the present application laid a pile filled with a filler with low vibration and low noise. We have developed a method that enables efficient and reliable filling of the filling material, using a casing with a double pipe structure having an inner pipe and an outer pipe, and when pulling up the inner and outer pipe casings, Disclosed is a method of charging a filler from a gap between an inner pipe casing and a pile and moving the inner pipe casing up and down to tamper the filler remaining under the casing.

[0003] In this case, the filling material around the buried pile is sufficiently compacted, so that the original peripheral surface supporting force of the pile can be obtained even in the soft ground, and the presence of the filling material in the ground in the event of an earthquake Excessive pore water pressure is dissipated and liquefaction is suppressed.

[0004]

[Patent Document 1] Japanese Patent Laid-Open No. 11-209976

[Patent Document 2] Japanese Patent Laid-Open No. 11-209973

[0005]

However, in the above-mentioned conventional method for burying prefabricated piles, a casing having a double pipe structure is used, and the inner pipe casing is moved up and down to compact the filler such as slag, gravel, and crushed stone. Therefore, the friction of the filler acts on the entire casing, which causes a problem that a large force is required for the vertical movement of the inner pipe casing. Further, since the filler is injected through the gap between the inner pipe casing and the pile, the filler is clogged in the middle of the inner pipe casing, and by moving the inner pipe casing up and down, it becomes difficult to manage the top of the pile and the filler is In addition to the problem that it is difficult to center the pile by moving up and down, there was a problem that it was difficult to consolidate the periphery of the pile and it was difficult to obtain the desired bearing capacity.

In view of the problems of the above-mentioned conventional burying method for ready-made piles, the present invention has a simpler structure and efficiently compacts the filling material, and facilitates the pile top management and centering. It is an object of the present invention to provide a method for burying ready-made piles, which is capable of ensuring the desired bearing capacity.

[0007]

In order to achieve the above object, the method for burying a prefabricated pile of the present invention is a method of burying a prefabricated pile in which a filler is placed in a gap between a hole wall of an excavation hole and the pile. The embedding method is characterized in that a filler is put into the excavation hole to fill the excavation hole, and a ready-made pile is press-fitted into the injected filler.

According to this method for burying a ready-made pile, the filler is put into the excavation hole to fill the excavation hole, and the ready-made pile is press-fitted into the introduced filler material. The volume of the filler is pushed laterally to ensure compaction, and this compaction enhances the bearing capacity of the ground and the piles, and the piles are stacked in columns. Since it is pressed into a uniform filler, construction management is easy and the top position and verticality of the pile can be made accurate. Also, since it is a simple mechanism, the device itself is simple and lightweight, and it can be attached to a general-purpose pile driving machine.
Assembly costs and transportation costs can be reduced. In this case, the ready-made piles can be press-fitted while rotating, or can be press-fitted without rotating, and in the former case, the advantage that the ready-made piles can be press-fitted with a small load, and also in the latter case In this case, there is an advantage that the bearing capacity of the ready-made piles can be confirmed for each pile.

In this case, as the ready-made pile, it is possible to use a ready-made pile having a ridge formed on the peripheral surface.

As a result, the pile and the filling material around the pile can be integrated, and the peripheral surface supporting force of the pile can be further enhanced.

Further, as the ready-made pile, it is possible to use a ready-made pile having a spiral projection formed on the peripheral surface.

As a result, it is possible to press-fit the ready-made piles into the filling material with a low load.

Further, when the main body diameter of the ready-made pile is d1, the diameter of the spiral projecting line is d2, the interval between the projecting lines is L, and the diameter of the improved body made of the filling material is d3, the improvement made by the ready-made pile and the filling material is made. It is desirable that the body satisfy at least one of the following relationships. 1.3d1 ≦ d2 ≦ 2.5d1 1.0d2 ≦ L ≦ 3.0d2 1.3d2 ≦ d3 ≦ 3.5d2

As a result, the vertical load acting on the pile head can be surely transmitted to the ground, and the vertical proof stress can be remarkably improved.

Further, as the ready-made pile, a ready-made pile having a tapered outer peripheral shape can be used by expanding the diameter upward.

[0016] As a result, by press-fitting the ready-made pile into the filling material, the filling material corresponding to the volume of the pile is pushed out in the lateral direction to be compacted, thereby increasing the stress in the horizontal direction and further increasing the peripheral surface supporting force. it can. Further, it is possible to press-fit the ready-made piles into the filling material with a low load.

As the ready-made pile, it is possible to use a ready-made pile in which a cylindrical pile is arranged at the upper part and a node pile is arranged at the lower part.

Thus, the cylindrical pile arranged at the upper portion can reduce the negative frictional force due to the consolidation settlement of the upper ground, and the node pile arranged at the lower portion can obtain a large supporting force.

Further, after the slag having the expandability and the solidifying property added with the solidifying agent is introduced into the drill hole, the filler can be introduced into the drill hole.

As a result, the bottom portion of the excavation hole can be reinforced and the pile supporting force can be further improved.

Further, as the filler, slag having expandability and solidification can be used. As the slag having the expandability and solidification property, steelmaking slag (converter slag and / or electric furnace slag (oxidizing slag and / or reducing slag) is referred to, and here, particularly, of steelmaking slag that has not been subjected to aging treatment. In addition, it refers to steel-making slag whose expansion has not been lost, such as steel-making slag whose expansion has been adjusted by partially performing aging treatment.), Refuse incineration slag, sludge slag, or a mixture of two or more thereof. Can be used. Furthermore, slag having expandability and solidification property is used alone, in addition to this, steel slag that lost expansion property, blast furnace slag, ferroalloy slag, granulated slag, copper smelting slag, red mud, fly ash, waste incineration. Industrial waste such as ash, crushed glass, waste gypsum, concrete waste, gypsum, quicklime, cement, crushed stone, earth and sand, building materials such as clay, artificial materials, one or more kinds of minerals, expanded, It is possible to use a slag that has the properties of solidification and slag that can utilize the expandability and solidification.

As a result, the expansive and solidifying slag intervening on the outer periphery of the pile absorbs water, expands, and solidifies, so that even if the gap between the drill hole and the pile is narrow, the compressive force is applied to the deep layer. Can be transmitted, and the ground around the pile can be easily, statically, and reliably compacted, and the bearing capacity of the ground can be enhanced, and thus the bearing capacity of the pile can be enhanced. In addition, it is possible to effectively utilize steelmaking slag, which is industrial waste, and to contribute to the formation of a recycling-based society.

Further, the ready-made piles can be built in the excavation hole excavated by the auger screw having the spiral band fixed to the outer peripheral portion of the spiral projection.

As a result, the soundness of the hole wall can be maintained, the excavated soil can be retained on the screw blades, and friction between the excavated soil and its surrounding ground can be ensured and lifted to the ground. it can.

Further, the diameter of the upper excavation hole can be formed to be larger than the diameter of the excavation hole in other portions.

As a result, the horizontal proof stress can be significantly improved.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for burying a ready-made pile according to the present invention will be described below with reference to the drawings.

1 to 2 show an embodiment of a method for burying a ready-made pile according to the present invention. In the method of burying the ready-made pile, first, as shown in FIGS. 1A to 1C, the auger screw 1 is used to excavate the ground. The diameter of the excavation hole is set to be larger than the outer diameter of the spiral protrusion 41 of the pile 4 described later. In this case, the auger screw 1 is, as shown in an example in FIG. 3, made up of a spiral band 13 fixed at least partially to the outer peripheral portion of the screw blade 11 provided on the screw shaft 12. And this auger screw 1
Is excavated to a predetermined depth while rotating in the forward direction in the excavating direction, and as shown in FIG. 1 (c), the excavated soil is rubbed by the spiral band 13 so that the excavated soil is rubbed with The soundness can be maintained, and the excavated soil can be held on the screw blades 11 to ensure the friction between the excavated soil and the outer ground to lift it to the ground.

In this embodiment, the spiral band 13 is
Although not particularly limited, it has a width of ¼ to ½, preferably about ⅓ of the pitch of the screw blades 11, and has a phase for each pitch of the screw blades, for example, 180 The screw blades 11 are formed so as to alternate with each other so as to be offset from each other, and to hang down from the screw blades 11. As a result, it is possible to enhance the function of supporting the hole wall that is about to collapse from the lower edge of the screw blade 11 and holding the excavated soil on the screw blade 11. Also, spiral band 1
If 3 is fixed to the tip portion of the auger screw 1, for example, the screw blade 11 for about 5 m, the above function can be exhibited.

Further, in the present embodiment, the hole diameters of the excavation holes are made uniform, but the present invention is not limited to this. For example, the hole diameter of the upper excavation hole is formed to be larger than the hole diameters of the other excavation holes. be able to. Here, the range of the upper excavation hole formed in a large diameter can be increased or decreased depending on the pile type, the property of the ground, etc., but normally, it is set to about 1/5 to 1/3 of the depth of the excavation hole. To do. As a result, the horizontal proof stress can be significantly improved.

Next, as shown in FIG. 1 (d), a filler slag or the like, preferably a mixed slag 31 to which a solidifying material is added as a tip reinforcing material, is added to the auger screw 1 from the ground. To a height of about 1 to 3D with respect to the diameter D of the tip portion of. In this case, as the slag, for example, expansion such as free CaO or free MgO, expandable and solidifying slag containing a solidifying component, and particularly preferably having expandability and solidifying property with a particle diameter of about φ10 to 100 mm. Steelmaking slag before aging treatment is used, and as the solidifying agent to be added, granulated slag, gypsum, blast furnace slag, cement, waste concrete, etc. can be used. As a result, the bottom of the excavation hole 2 can be reinforced and the supporting force for the pile 4 can be further improved.

Then, as shown in FIG. 2A, the filler 3 is put into the excavation hole 2 from the ground so that the excavation hole 2 is once filled up to the top end position of the pile 4. In this case, the filler 3 is, for example, a slag containing free CaO, free MgO, etc., which has expansion and solidification components, and which has expandability and solidification property, and particularly preferably has expandability and solidification property with a particle diameter of about 10 mm under. The steelmaking slag that has not been subjected to the aging treatment is charged alone or a mixture of the steelmaking slag as described below is uniformly added. In this case, the N value when the filler 3 is charged is 5 to 10.

Next, as shown in FIG. 2 (b), the pile 4 is
The pile core position of the filler 3 filling the excavation hole 2 is set. Here, as the pile 4, a steel pipe pile whose tip is closed and spiral ridges 41 are formed on the outer peripheral surface at an equal pitch is used.
By closing the tip of the steel pipe pile 4 in this manner, as described later, when the steel pipe pile 4 is press-fitted into the filler 3 filling the excavation hole 2 while rotating in the screwing direction, The filler 3 is prevented from entering the inside of the steel pipe 4, and thus the filler 3 corresponding to the volume of the steel pipe pile 4 is pushed out in the lateral direction to surely perform compaction.

An excavation claw (not shown) can be attached to the tip of the pile 4 so that when the pile 4 is press-fitted into the filler 3 filling the excavation hole 2 while rotating. And the pile 4 can easily penetrate into the filler 3.

Now, the relationship between the pile diameter of the steel pipe pile 4 and the diameter of the improved body made of the filler 3 will be described with reference to FIG.
In particular, a slag having expandability and solidification is used as the filler 3, and the integrity of the slag having expandability and solidification and the steel pipe pile 4 is kept high to ensure vertical load acting on the pile head. (The same applies basically when a material other than expansive and solidifying slag is used for the filler 3) in order to make the main diameter of the steel pipe pile 4 d1 and the spiral protrusion. The diameter of the strip 41 is d2, the interval between the strips is L, and the filler 3
Improved body by slag (hereinafter referred to as "slag improved body")
Say. ), Where the diameter is d3, the steel pipe pile 4 and the slag improver by the filler 3 preferably satisfy the following relationship. Regarding the diameter of the spiral projection of the steel pipe pile The diameter d2 of the spiral projection 41 of the steel pipe pile 4 is 1.3 to 2.5 times the main body diameter d1 of the steel pipe pile 4. The diameter d2 of the spiral projection 41 of the steel pipe pile 4 is the body diameter d1 of the steel pipe pile 4.
If it is less than 1.3 times, the integration with the slag improver is not effectively exerted, and the bearing capacity of the steel pipe pile 4 is not sufficiently exhibited. Further, if it is more than 2.5 times, the resistance force due to the rotational penetration during the construction works largely and the steel pipe pile 4 main body is damaged due to the twisting phenomenon. Therefore, it is necessary to increase the thickness of the ridge 41 and the steel pipe pile 4 main body. Yes, it is uneconomical. Regarding the spacing between the ridges of the steel pipe pile The spacing L between the spiral ridges 41 of the steel pipe pile 4 is 1.0 to 3.0 times the diameter d2 of the ridge 41. When the distance L between the spiral protrusions 41 of the steel pipe pile 4 is less than 1.0 times the diameter d2 of the protrusions 41, the bearing effect of the protrusions 41 is equal to the bearing resistance at the lower surface of the protrusions 41. The shaft frictional resistance below the ridges 41 mainly contributes, but if the interval L between the ridges 41 is short, the upper and lower ridges 41 interfere with each other, which makes it difficult to exert a bearing effect. 3.
When it is greater than 0 times, the ridge resistance is similar to the pile tip resistance, and therefore it is difficult to sufficiently exert the bearing resistance of the lower surface of each ridge 41. Regarding the slag improving body, the diameter d3 of the slag improving body is the diameter d of the spiral protrusion 41.
2 to 1.3 to 3.5 times. Diameter d3 of improved slag
However, when the diameter d2 of the spiral ridge 41 is less than 1.3 times, the influence range of the bearing pressure of the ridge 41 affects the ground further than the slag improver. Need to be bigger. In addition, since the slag has expandability and solidification property, the ground surrounding the hole wall is statically compacted to increase the strength. Therefore, in order to maximize the influence of the bearing pressure of the ridge 41, the diameter of the slag improver d3 is 3.5 times or less of the diameter d2 of the spiral protrusion 41. The above relationships (1) to (4) do not necessarily have to satisfy all of them, and can be applied in appropriate combination depending on the properties of the ground.

By the way, in this embodiment, the ready-made pile 4 is used.
As for, the steel pipe pile in which the tip is closed and the spiral projections 41 are formed on the outer peripheral surface at an equal pitch is used, but the pile that can be used for the burying method of the ready-made pile of the present invention is not limited to this. Not, for example, when the pile diameter is large or the press-fitting resistance of the pile is large, the pile that enables press-fitting of the ready-made pile into the filling material by opening the tip at a low load, A steel pipe pile, a concrete pile, or an outer peripheral shape in which a spiral projection 41 is intermittently or partially formed on the outer peripheral surface is formed into a taper shape, and is used by expanding the diameter toward the upper side. By press-fitting the ready-made piles into the pile, the filler in the volume of the pile is pushed out in the lateral direction and compacted to increase the horizontal stress, which makes it possible to further increase the peripheral surface supporting force and Press-fitting ready-made piles into Of piles 4 (see, for example, FIGS. 5 (a) to 5 (c)), knot piles (those having normal ring-shaped knots or knots having a gentle slope), and cylindrical piles. Piles connecting knot piles to the upper or lower part, especially cylindrical piles 4A at the top and knot piles 4B at the bottom,
By arranging them respectively, the cylindrical piles 4A arranged at the upper portion reduce the negative frictional force due to the consolidation settlement of the upper ground, while the node piles 4B arranged at the lower portion can obtain a large supporting force. Pile 4 (eg, FIG. 5
See (d). In this case, the bending strength of the cylindrical pile 4A arranged in the upper part can be set to be larger than the bending strength of the node pile 4B arranged in the lower part. It is possible to use a ready-made pile in which the characteristics of various ready-made piles such as) are appropriately combined. Depending on the type of the prefabricated pile 4, the prefabricated pile 4 can be press-fitted while rotating it, or can be press-fitted without rotating it. In the former case, the prefabricated pile 4 can be press-fitted with a small load. In the latter case, there is an advantage that the supporting force of the ready-made pile 4 can be confirmed for each pile.

Then, as shown in FIG. 2 (c), the pile 4 having the spiral projection 41 formed therein is press-fitted into the filler 3 filling the excavation hole 2 while rotating in the screwing direction. As a result, the pile 4 enters the filling material 3 by the propulsive force generated by the rotation of the spiral ridge 41. in this case,
With the press-fitting of the pile 4, the filling material 3 corresponding to the volume of the pile 4 is compacted, and the ground around the excavation hole 2 is compacted via the filling material 3. Although the bulk of the filling material 3 is reduced by this, as shown in FIG. 2C, the filling material 3 is replenished by the reduced bulk.

By repeating such work, the pile 4 is built up to a predetermined depth of the filler 3 as shown in FIG. 2 (d). In this case, as the filler 3, a slag having free expansiveness and solidifying property, such as free CaO or free MgO, which contains a solidifying component, is used. As the slag having expandability and solidifying property, steel slag (converter slag and / or electric furnace slag (oxidizing slag and / or reducing slag) is referred to, and here, particularly, aging treatment (specifically, particularly For example, steel slag that has not been subjected to stabilization treatment by holding it in steam at about 100 ° C for about 100 hours or being left open-air for a long period of time, but not limited to aging treatment. The steelmaking slag whose expansion has not been extinguished, such as the steelmaking slag whose expansion has been adjusted by performing the same).
One type or a mixture of two or more types of refuse incineration slag and sludge slag can be used. Furthermore, slag having expandability and solidification is used alone, in addition to this, steel slag that lost expansion, blast furnace slag, ferroalloy slag, granulated slag, copper smelting slag, red mud, fly ash, waste incineration. Industrial waste such as ash, crushed glass, waste gypsum, concrete waste, gypsum, quicklime, cement, crushed stone,
It is possible to use a slag that has expansive and solidifying properties, which is a mixture of one or more kinds of building materials such as earth and sand, artificial materials, and minerals, and that can utilize the expansive and solidifying properties, in particular, It is preferable to add a strong alkaline substance to the steelmaking slag before aging treatment and the slag after aging treatment before use. As a result, the slag having an expansive and solidifying property interposed in the outer peripheral portion of the pile 4 absorbs water, expands, and solidifies, so that even if the gap between the drilled hole 2 and the pile 4 is narrow, a compressive force is applied to the deep layer. Can be transmitted, and the ground around the pile 4 can be easily, statically, and reliably compacted, and the bearing capacity of the ground can be increased, thereby increasing the bearing capacity of the pile 4. it can. In addition, it is possible to effectively utilize steelmaking slag, which is industrial waste, and to contribute to the formation of a recycling-based society.

Thus, according to the method for burying the ready-made piles of this embodiment, the filler 3 is charged into the excavation hole 2 to fill the excavation hole 2, and a spiral projection is formed on the outer peripheral surface of the injected filler 3. Since the pile 4 on which the strip 41 is formed is press-fitted while rotating in the screwing direction, the press-fitting of the pile 4 pushes the filling material 3 corresponding to the volume of the pile 4 in the lateral direction to surely perform compaction. By this compaction, the bearing capacity of the ground can be increased and the bearing capacity of the pile 4 can be increased, and furthermore, since the pile 4 is rotationally press-fitted into the uniform filler 3 that is laminated in a columnar shape, construction management is performed. It is easy, the top position and verticality of the pile 4 can be made accurate, and a uniform supporting force can be expressed. In addition, since it is a simple mechanism, the device itself is simple and lightweight, and it can be attached to a general-purpose pile driving machine, which enables construction in narrow spaces and reduces assembly and transportation costs. It can be reduced.

[0040]

Example: A change in the bearing capacity of the pile due to the difference in the filler 3 (the second limit load: the load when the pile tip settlement amount corresponding to 10% of the pile tip diameter occurs) is expanded as the filler. Table 1 shows the results of the field-scale experiment conducted using the steelmaking slag having the solidity and solidification property and the commonly used cement milk. The field-scale experiments conducted are as follows.

[Field Scale Experiment] Pile No. Pile type: Steel pipe pile Pile length 11 m Body diameter φ318 Spiral ridge diameter φ440 Tip closed drilling hole (φ700) Steel slag (-10 mm) having expandability and solidification as a filler is put into the drilling hole At the same time as filling, the steel pipe pile was pressed into the charged filler while rotating.・ Pile No. Pile type: PHC round pile, Pile length 11m, Main body diameter φ450, PHC round pile is built in the open drilling hole (φ700), and pile hole and P
Cement milk was injected into the gap between the HC round piles to form a soil cement layer.

[0042]

[Table 1]

As shown in Table 1, pile No. 1 using a steelmaking slag having expandability and solidification as a filler. Pile No. in which the value of the second limit load and the value of its 3-month curing / 1 month curing both form a soil cement layer. It was confirmed that the bearing capacity of the pile can be increased by expanding and solidifying the steelmaking slag.

The method for burying a ready-made pile according to the present invention has been described above based on its embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and is within a range not departing from the spirit of the present invention. The configuration can be changed as appropriate.

[0045]

According to the method for burying a ready-made pile of the present invention, the filler is put into the excavation hole to fill the excavation hole, and the ready-made pile is press-fitted into the introduced filler. This ensures that the filling material for the pile volume is pushed laterally to ensure compaction, and this compaction enhances the bearing capacity of the ground and the bearing capacity of the pile. Since it is press-fitted into a uniform filler that is laminated in a columnar shape, it is easy to perform construction management, the pile top position and verticality of the pile can be made accurate, and a uniform bearing capacity is expressed, with high reliability. It is possible to build a pile foundation. In addition, since it is a simple mechanism, the device itself is simple and lightweight, and it can be attached to a general-purpose pile driving machine, which enables construction in narrow spaces and reduces assembly and transportation costs. It can be reduced. In this case, the ready-made piles can be press-fitted while rotating, or can be press-fitted without rotating, and in the former case, the advantage that the ready-made piles can be press-fitted with a small load, and also in the latter case In this case, there is an advantage that the bearing capacity of the ready-made piles can be confirmed for each pile.

Further, by using a ready-made pile in which a ridge is formed on the peripheral surface as the ready-made pile, the pile and the filling material around the pile can be integrated, and the peripheral surface supporting force of the pile can be further improved. Can be increased.

Further, by using a ready-made pile having a spiral projection on the peripheral surface as the ready-made pile, press-fitting of the ready-made pile into the filling material can be carried out with a low load.

Further, when the main body diameter of the ready-made pile is d1, the diameter of the spiral projecting line is d2, the space between the projecting lines is L, and the diameter of the improved body made of the filler is d3, the improvement made by the ready-made pile and the filler is made. By making the body satisfy at least one of the following relationships, the vertical load acting on the pile head can be surely transmitted to the ground, and the vertical proof stress can be remarkably improved. . 1.3d1 ≦ d2 ≦ 2.5d1 1.0d2 ≦ L ≦ 3.0d2 1.3d2 ≦ d3 ≦ 3.5d2

Further, by using a ready-made pile having a tapered outer peripheral shape for the ready-made pile so as to expand its diameter upward, by press-fitting the ready-made pile into the filling material,
By laterally extruding and compacting the filling material corresponding to the volume of the pile, the stress in the horizontal direction is increased and the peripheral surface supporting force can be further enhanced. Further, it is possible to press-fit the ready-made piles into the filling material with a low load.

Further, by using the ready-made piles in which the cylindrical piles are arranged in the upper part and the node piles are arranged in the lower part as the ready-made piles, the negative frictional force due to the consolidation settlement of the upper ground is caused by the cylindrical piles arranged in the upper part. While mitigating, a large supporting force can be obtained by the node pile arranged in the lower part.

Also, after adding a slag having a expanding property and a solidifying property to the drilling hole, which has a solidifying agent added thereto, by charging a filler into the drilling hole, the bottom of the drilling hole is reinforced and the pile supporting force is increased. Can be further improved.

Further, by using the expansive and solidifying slag as the filling material, the expansive and solidifying slag which is interposed in the outer peripheral portion of the pile absorbs water, expands and solidifies, and thereby the excavation hole is drilled. Even if the gap between the pile and
Compressive force can be transmitted to the deep layer, and the ground around the pile can be easily, statically and surely compacted, and the bearing capacity of the ground can be increased. Can be increased. In addition, it is possible to effectively utilize steelmaking slag, which is industrial waste, and to contribute to the formation of a recycling-based society. As the slag having the expandability and the solidifying property, it is possible to use one kind or a mixture of two or more kinds of a steelmaking slag, a refuse incineration slag, and a sludge slag, and a slag having the expanding property and the solidifying property is used alone. In addition to using it, industries such as steel slag that lost expansiveness, blast furnace slag, ferroalloy slag, granulated slag, copper smelting slag, red mud, fly ash, refuse incineration ash, glass crushed material, waste gypsum, concrete waste material The expansiveness and solidification of slag with expansiveness and solidification, which is a mixture of waste materials, gypsum, quick lime, cement, crushed stone, earth and sand, building materials such as clay, artificial materials, and one or more kinds of minerals. What is available can be used.

Moreover, the soundness of the hole wall can be maintained by building ready-made piles in the excavation hole excavated by the auger screw having the spiral band fixed to the outer peripheral portion of the spiral projection. It is possible to hold the excavated soil on the screw blades and ensure the friction between the excavated soil and the surrounding ground to lift it to the ground.

Further, by forming the diameter of the upper excavation hole to be larger than the diameter of the excavation holes in other portions, the horizontal proof stress can be remarkably improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of a method for burying ready-made piles of the present invention,
(A)-(c) is sectional drawing which shows a 1st process, (d) is a 2nd figure.
It is sectional drawing which shows a process.

FIG. 2 shows an embodiment of a method for burying ready-made piles according to the present invention,
(A) is sectional drawing which shows a 3rd process, (b) is sectional drawing which shows a 4th process, (c) is sectional drawing which shows a 5th process, (d) is sectional drawing which shows a 6th process. Is.

FIG. 3 is a partial front view showing an auger screw used in the method for burying a ready-made pile according to the present invention.

FIG. 4 is an explanatory view showing a ready-made pile used in the method for burying a ready-made pile according to the present invention.

FIG. 5 is an explanatory view showing a ready-made pile having a tapered outer peripheral shape used in the method for burying a ready-made pile according to the present invention.

[Explanation of symbols]

1 auger screw 11 screw blades 12 screw shaft 13 spiral band 2 drill holes 3 Filling material 31 mixed slag 4 Ready-made piles 41 spiral ridge

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2D041 AA02 BA11 BA16 BA22 BA25                       BA35 CA03 DB02 FA02 FA06                 2D050 AA06 BB04 CA01 CB03 CB05

Claims (12)

[Claims] 1. A method for burying a ready-made pile in which a filler is placed in a gap between a hole wall of the drill hole and the pile to build a ready-made pile. A method for burying prefabricated piles, characterized by press-fitting prefabricated piles into the filled material. 2. The method for burying a prefabricated pile according to claim 1, wherein a prefabricated pile having a ridge formed on a peripheral surface thereof is used as the prefabricated pile. 3. The prefabricated pile burying method according to claim 2, wherein a prefabricated pile having a spiral projection formed on a peripheral surface is used as the prefabricated pile. 4. When the main body diameter of the ready-made pile is d1, the diameter of the spiral projecting line is d2, the interval between the projecting lines is L, and the diameter of the improved body made of the filling material is d3, improvement made by the ready-made pile and the filling material The method for burying prefabricated piles according to claim 3, wherein the body satisfies at least one of the following relationships. 1.3d1 ≦ d2 ≦ 2.5d1 1.0d2 ≦ L ≦ 3.0d2 1.3d2 ≦ d3 ≦ 3.5d2 5. The ready-made pile according to claim 1, 2, 3 or 4, wherein a ready-made pile having a tapered outer peripheral shape is used as the ready-made pile such that the diameter is increased upward. Burial method. 6. The prefabricated pile according to claim 1, wherein the prefabricated pile has a cylindrical pile in an upper part and a node pile in a lower part, and the prefabricated pile is used. Construction method. 7. The filling material is introduced into the drill hole after the slag having the expandability and the solidifying property, to which the solidifying agent has been added, is introduced into the drill hole. The method for burying ready-made piles according to 5 or 6. 8. A slag having expandability and solidifying property is used as a filler, wherein the filler is a slag.
The method for burying a ready-made pile described in 5, 6, or 7. 9. The ready-made pile according to claim 7, wherein the expansive and solidifying slag is made of one or a mixture of steelmaking slag, refuse incineration slag, and sludge slag. Buried construction method. 10. A slag having expandability and solidification,
Industrial waste such as steelmaking slag, blast furnace slag, ferroalloys slag, granulated slag, copper smelting slag, red mud, fly ash, waste incineration ash, crushed glass, waste plaster, concrete waste materials, gypsum, quick lime Being able to use the expansiveness and solidification of slag having the expansiveness and solidification, which is a mixture of one or more kinds of building materials such as cement, crushed stone, earth and sand, clay, artificial materials, and minerals. The method for burying a ready-made pile according to claim 7, 8, or 9. 11. A prefabricated pile is built in an excavation hole excavated by an auger screw having a spiral band fixed to an outer peripheral portion of a screw blade.
The method for burying a ready-made pile according to 3, 4, 5, 6, 7, 8, 9 or 10. 12. The hole diameter of the upper excavation hole is formed to be larger than the hole diameter of the excavation holes in the other portions, respectively. 9, 10 or 1
The method for burying prefabricated piles described in 1.