JP4183041B2 - Pile internal filling method - Google Patents

Description

  The present invention relates to a construction method for easily filling a lightweight filler into a hollow pile placed on the ground to support a building.

  Foundation piles may be laid in order to increase the bearing capacity of buildings on soft ground, etc., and in housing lots where medium and low-rise buildings such as houses are built, prefabricated hollow shapes such as steel pipe piles and concrete piles are used. Stakes are used. When placing the pile, the pile is pressed into the ground while rotating the steel pipe pile using a pile driving machine. For example, as shown in FIG. 7, a lifting tower 92 is provided in a vertical direction on a boom 91 of a crane 90, and a hydraulic rotary shaft 93 is provided on the lifting tower 92 so as to be movable up and down. The steel pipe pile 94 is driven on the ground by lowering the hydraulic rotary shaft 93 while attaching and rotating 1.

  Generally, when a ready-made hollow pile is placed on the ground, the inside is filled with concrete. For example, if it is the said steel pipe pile 94, as shown in FIG. 8, the concrete 95 will be poured and filled in the inside of the steel pipe pile 94, and it will harden and solidify for a predetermined period. Thereby, while the concrete 95 reinforces the steel pipe pile 94 and prevents buckling etc., it can prevent that rainwater etc. penetrate | invade into the inside of the steel pipe pile 94, and rust (for example, refer patent document 1 and patent document 2). .

JP 2003-184099 A JP 2003-138583 A

  The bearing capacity of a ready-made hollow pile such as the steel pipe pile 94 is the weight of the steel pipe pile 94 itself, based on the sum of the bearing capacity due to friction between the peripheral surface of the steel pipe pile 94 and the ground and the bearing capacity of the tip of the steel pipe pile 94. Subtracted. Therefore, filling the concrete 95 inside the steel pipe pile 94 adds the weight of the concrete 95 to the weight of the steel pipe pile 94, so that the supporting force of the steel pipe pile 94 is reduced by the weight of the concrete 95. .

  In addition, the filling of the concrete 95 into the steel pipe pile 94 is performed by filling the steel pipe pile 94 with a mixture of aggregate, cement, and water and solidifying the steel pipe pile 94. When the kneaded material is poured into the inside from the ground, bubbles are likely to be generated in the kneaded material filled in the steel pipe pile 94, and a void may be generated in the solidified concrete 95. In addition, during the curing period of the kneaded material, the aggregate sinks deep inside the pile due to the difference in the weight of each component of the kneaded material, and there is much aggregate on the lower side of the steel pipe pile 94 and less on the upper side. Unevenness occurs. As a result, there is a possibility that the concrete 95 in which the kneaded material is solidified is uneven, and the reinforcing effect and the rust preventing effect may not be sufficiently exhibited, and the quality of the steel pipe pile 94 becomes unstable.

  The present invention has been made to solve such a problem, and provides an internal filling method for a pile that can reduce the weight of the filler to be filled in the pile and can exhibit stable quality by an easy construction method. With the goal.

  The pile internal filling method according to the present invention is a rod-like structure in which a hollow pile for supporting a building is placed on the ground, and a filler containing cement, building waste, and soil can be inserted into the pile. The solidified rod-shaped filler is inserted into the inside of the pile, and the powder-like filler made of the filler powder is filled into the gap inside the pile into which the rod-shaped filler is inserted, and the pile The powder filler is solidified by pouring water into the inside.

  Moreover, the internal filling method of the pile according to the present invention is to appropriately drill a through hole in the peripheral surface of a hollow pile for supporting a building, and to place the hollow pile on the ground, to provide cement, building waste, and soil. A rod-like filler formed by solidifying the filler contained in a rod shape that can be inserted into the inside of the pile is inserted into the pile, and a powdery filler made of powder of the filler is used as the rod-like filler. Is filled in a gap inside the pile into which the powder is inserted, and is allowed to stand naturally, so that the powdered filler is solidified by being immersed in the pile through the through hole from the ground.

  Further, it is preferable to use one or both of a crushed tile and a crushed gypsum board as construction waste of the filler, and a residual soil generated from a construction site as soil of the filler.

  According to the internal filling method of a pile according to the present invention, since the filler containing cement, building waste, and soil is used, the weight of the filler is reduced compared to the conventional concrete, and the decrease in the bearing capacity of the pile is suppressed. It is possible to effectively use building waste materials. In addition, since the filler is inserted into the pile as a rod-shaped filler that has been solidified in advance and filled with powder filler in the gap, the construction is easy and the filler does not become uneven. Can be stabilized.

  Moreover, according to the internal filling method of a pile according to the present invention, a hollow pile is previously drilled with a through hole, and the powder filler filled in the gap between the pile and the rod-like filler is passed through the through hole to the inside of the pile. Since it solidifies with the water that has entered the inside, the work of pouring water into the hollow pile becomes unnecessary, the construction becomes easier and the water injection does not disturb the site.

  Moreover, by using tile ground material or gypsum board ground material as the building waste material for the filler, the filler can be effectively reduced in weight, and the residual soil generated from the construction site is used as the soil for the filler. As a result, it is not necessary to discard the remaining soil, and the construction cost can be reduced.

Hereinafter, a pile internal filling method according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows the structure of a steel pipe pile placed on the ground to support a building such as a house. As shown in the figure, the present steel pipe pile 1 is formed by joining cylindrical steel pipe piles 1A and 1B on a coaxial line, and a spiral blade 2 is protruded from the tip portion of the steel pipe pile 1A on the tip side. The tip opening is sealed by the lid 3. In such a steel pipe pile 1, first, the steel pipe pile 1 </ b> A is rotationally press-fitted into a predetermined position of the ground using a pile driving machine, and then the steel pipe pile 1 </ b> B is welded or connected to the proximal end side of the steel pipe pile 1 </ b> A. And then driven into the ground by rotational press-fitting. In addition, this steel pipe pile 1 is an example of the hollow pile by which the internal filling construction method of the pile which concerns on this invention is constructed, and the joining structure of a steel pipe pile, the placement method, etc. are not limited to what is shown in this Embodiment. Of course, the present invention can also be used for other ready-made hollow piles such as concrete piles.

  In the internal filling method of this pile, after filling the steel pipe pile 1A on the ground, the filling material is filled. As shown in FIG. 2, the inside of the cast steel pipe pile 1A is hollow. When the lid 3 is not provided on the steel pipe pile 1A, the excavated soil enters the steel pipe pile 1A to some extent, but most of the internal space is hollow. A rod-shaped filler 4 is inserted into the steel pipe pile 1A as shown in FIG. The rod-like filler 4 is obtained by adding water to a filler containing cement, building waste material, and soil, kneading the mixture, and solidifying it into a desired rod shape using a mold.

  Building debris becomes waste upon dismantling of houses, specifically tiles, bricks, gypsum board, plastic materials, etc., but this filler is used as concrete aggregate among these A tile or a plaster board is suitable when a lighter one than gravel is used and considering the weight, the discharge amount due to dismantling, the alteration in the ground, and the like. For example, the tile is crushed to a maximum diameter of about 30 mm and used as a coarse aggregate, and the gypsum board is pulverized into a powder and used as a fine aggregate. Such building waste is collected from the demolition site to a factory and pulverized, and the pulverized material is carried to the construction site. When building a new building after dismantling at the same construction site, a pulverizer is carried to the construction site. It may be crushed on site.

  Moreover, as the soil for the filler, it is preferable to use the residual soil generated from the construction site. For example, the ground is excavated at the time of construction of a house foundation, but the excavated earth and sand is discarded as the remaining soil except for the amount necessary for backfilling. By using such remaining soil, it is not necessary to discard the remaining soil, and the construction cost of a house or the like can be reduced.

  The content ratio of each component contained in this filler is 1 part by weight for the cement and gypsum board pulverized product, 4 parts by weight for the crushed tile and 3 parts by weight for the remaining soil, and 2 parts by weight of water is added thereto. Knead. In calculation, the weight per unit cubic of the conventional concrete made of coarse aggregate, fine aggregate, cement, and water is about 2300 kg, whereas the weight per unit cubic of the solidified filler is about 1300. It is ˜1600 kg, and the weight can be reduced by about 30 to 40%.

  A rod-like filler 4 is obtained by solidifying such a filler into a rod shape. The rod-like filler 4 is solidified by using a mold so that it can be inserted into the steel pipe piles 1A and 1B. . The cross-sectional shape of the rod-shaped filler 4 may be square or circular. For example, a rectangular shape can be obtained by using a mold formed by appropriately partitioning a pallet-shaped housing, and a circular shape can be obtained by using a cylindrical mold. It is done. The cross-sectional shape of the rod-like filler 4 is square, and as shown in FIG. 4, the diagonal is slightly smaller than the inner diameter of the steel pipe piles 1A and 1B and inserted into the steel pipe piles 1A and 1B in the axial direction. By being stacked, it can be inserted into the steel pipe piles 1A and 1B and occupies most of the internal space. Moreover, the length of the rod-shaped filler 4 is appropriately set in consideration of the inner diameter and length of the steel pipe piles 1A and 1B and the efficiency of the insertion work. For example, if the length of the steel pipe piles 1A and 1B is about 6 m, The length is preferably about 60 to 100 cm. The rod-like filler 4 formed in this way is sequentially inserted into the inside from the proximal end side opening of the steel pipe pile 1A, and the rod-like filler 4 is stacked over the length direction inside the steel pipe pile 1A.

  The rod-shaped filler 4 is rectangular and its diagonal line is made smaller than the inner diameter of the steel pipe pile 1A so that it can be easily inserted into the steel pipe pile 1A. Therefore, as shown in FIG. There is a gap. As shown in FIG. 5, the gap is filled with a powder filler 5 which is the filler and is a powder before adding water. By filling the filler in powder form without adding water and kneading, no cavities are formed, and in a narrow space such as the gap, the degree of freedom of the crushed tile material that becomes coarse aggregate is small. Even if there is a difference in weight between the tile crushed material and other components in the filler 5, the tile crushed material is difficult to sink. Moreover, since most of the internal space of the steel pipe pile 1A is occupied by the rod-shaped filler 4, even if some filling unevenness occurs in the powdered filler 5, there is unevenness in the solidified state of the filler in the entire internal space. It is hard to occur.

  After filling the inside of the steel pipe pile 1A with the powder filler 5, water is poured from the proximal end side opening of the steel pipe pile 1A in order to solidify the powder filler 5. Thereafter, the steel pipe pile 1B is joined to the proximal end of the steel pipe pile 1A. The joining is a well-known and arbitrary method, for example, by welding the ends of the steel pipe pile 1A and the steel pipe pile 1B, or using a joint such as a sheath pipe. After joining the steel pipe pile 1B, again, the steel pipe piles 1A and 1B are rotationally press-fitted into the ground by a pile driving machine, and the inside of the steel pipe pile 1B placed on the ground is filled with the filler as described above. Do. Thus, after filling each steel pipe pile 1A, 1B with a filler and pouring water, it cures for a predetermined period and solidifies the powdery filler 5.

  As described above, according to the internal filling method of the pile according to the present embodiment, since the filler containing cement, ground crushed material, gypsum board pulverized material, and residual soil is used, the filler is more than conventional concrete. It is possible to reduce the weight of the steel pipe pile 1 and to suppress a decrease in the supporting force of the steel pipe pile 1 and to effectively use building waste materials such as tiles and gypsum boards. In addition, since the filler is inserted into the steel pipe pile 1 as the rod-like filler 4 solidified in advance in a rod shape, and the gap is filled with the powder filler 5, the construction is easy and the work efficiency is improved and solidified. Unevenness and cavities do not occur in the filler, and the quality of the steel pipe pile 1 such as strength and supporting force can be stabilized.

  In this embodiment, each time the steel pipe piles 1A and 1B are placed, the rod-like filler 4 and the powder filler 5 are filled and injected, but the steel pipe pile 1A and the steel pipe pile 1B are driven. It is good also as filling and pouring of the rod-shaped filler 4 and the powder-form filler 5 at once after installing.

Hereinafter, modifications of the embodiment will be described.
In the internal filling method of the pile according to this modification, a through hole 6 is drilled in advance on the peripheral surface of the steel pipe pile 1. The through-hole 6 is for allowing water to enter the inside of the steel pipe pile 1 from the ground. For example, the through-hole 6 is drilled at a predetermined interval on the peripheral surface of the steel pipe piles 1A and 1B, or the steel pipe pile 1A and the steel pipe pile. A through-hole 6 can be formed by providing a gap in the joint portion of 1B. Although the magnitude | size of the through-hole 6 is not specifically limited, It is set as the circular hole and slit which are the grades which the intensity | strength of steel pipe pile 1A, 1B and a joining part is not impaired remarkably.

  The steel pipe piles 1A and 1B having the through-holes 6 are respectively placed on the ground using a pile driving machine, and the steel pipe piles 1A and 1B are placed each time the steel pipe piles 1A and 1B are placed. The rod-shaped filler 4 solidified in advance is inserted into the interior of 1A and 1B, and the gap around the rod-shaped filler 4 is filled. At this time, water is not injected into the steel pipe piles 1A and 1B. After finishing placing the steel pipe pile 1 and filling the filler in this manner, the water in the ground due to rain or the like is allowed to stand through the through hole 6 as shown in FIG. The inside of 1B is immersed in water, and the powdery filler 5 is solidified by the water.

  Thus, according to this modification, the same effect as the above-mentioned embodiment can be produced, and further, the through hole 6 is previously drilled in the steel pipe piles 1A, 1B, and the steel pipe piles 1A, 1B and Since the powder filler 5 filled in the gap with the rod-like filler 4 is solidified with water that has entered the steel pipe piles 1A and 1B through the through holes 6, the powder filler 5 is inside the steel pipe piles 1A and 1B. The work of pouring water after filling is unnecessary, and the construction is further facilitated, and the ground is not muddy when water is poured.

  The pile internal filling method according to the present invention can be used in a foundation method in which a hollow pile is placed on the ground for building a house or the like to increase the supporting force of the ground.

It is the schematic which shows the structure of the steel pipe pile 1 which concerns on embodiment of this invention. It is sectional drawing which shows the state which laid steel pipe pile 1A. It is sectional drawing which shows the state which inserted the rod-shaped filler. It is a top view which shows the rod-shaped filler 4 of the state inserted in the steel pipe pile 1A. It is sectional drawing which shows the state with which the powdery filler 5 was filled. It is sectional drawing which shows the structure of the steel pipe pile 1 which concerns on a modification. It is the schematic which shows an example of a pile driver. It is sectional drawing which shows the structure of the conventional steel pipe pile 94. FIG.

Explanation of symbols

1,1A, 1B Steel pipe pile (hollow pile)
4 Rod-like filler 5 Powdery filler 6 Through hole

Claims (3)

  A hollow pile for supporting a building is placed on the ground, and a rod-shaped filler formed by solidifying the filler containing cement, building waste material, and soil into a rod shape that can be inserted into the inside of the pile, The powder filler made of the powder of the filler is filled into a gap inside the pile into which the rod filler is inserted, and water is poured into the pile to fill the powder filler. An internal filling method for piles, characterized by solidifying.   A through-hole is appropriately drilled in the peripheral surface of a hollow pile for supporting a building, the hollow pile is placed on the ground, and a cement, a building waste material, and a filler containing soil can be inserted into the pile. A rod-shaped filler solidified in a rod shape is inserted into the inside of the pile, and a powdery filler made of the powder of the filler is filled into a gap inside the pile into which the rod-shaped filler is inserted, An internal filling method for a pile, wherein the powdered filler is solidified by allowing the ground to be immersed in the pile through the through-hole from natural ground.   The internal filling of a pile according to claim 1 or 2, wherein one or both of a ground pulverized product or a crushed gypsum board is used as the building waste material of the filler, and the remaining soil generated from a construction site is used as the soil of the filler. Construction method.

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