JP6656972B2 - Removal method of solidified material from pile head of ready-made pile - Google Patents

Description

The present invention, struts and walls, in order to enhance the integrity of the concrete structure to be built on top of the prefabricated pile foundation such as for pouring into the ready-made pile as medium-packed concrete part of the concrete structure The present invention relates to a method for removing a solidified material composed of a cement component filled in a ready-made pile in a process of setting the ready-made pile in order to form a hole in a pile head inside the ready-made pile.

Referring to FIG. 3, a hole 119 for driving a part of a concrete structure to be built in the upper part of the ready-made pile disclosed in Patent Document 1 into the ready-made pile as filling concrete is formed inside the ready-made pile 101. A method for performing the above will be described. As shown in FIG. 3A, a cement extraction tool 102 is installed in the upper side of a ready-made pile 101 having both ends open. The cement removal tool 102 has a pair of inverted U-shaped support members 103 arranged so as to straddle the inside and outside of the paper tube 104 and fixed to the paper tube 104, and an inner covering 105 made of synthetic resin and a synthetic resin. An outer covering 106 made of resin covers the outside of the paper tube 104 and the outside of the pair of support members 103 and is fixed to the paper tube 104, and the bent portion 107 of the pair of support members 103 above the paper tube 104 is bent. Both ends of the penetrating stop bar 108 are attached to the upper end surface of the ready-made pile 101. The ready-made stake 101 on which the cement extraction tool 102 is installed as described above is excavated from one end side in the unhardened concrete 113 poured into the excavation hole 112 excavated in the ground 111. The unhardened concrete 113 in the hole 112 rises and is taken into the gap 114 between the ready-made pile 101 and the excavation hole 112, the gap 115 between the ready-made pile 101 and the cement removal tool 102, and the inner space 116 of the cement removal tool 102.

Then, as shown in FIG. 3B, after the unhardened concrete 113 is cured and hardened, the retaining rod 108 is removed from the ready-made pile 101, and the pair of support members 103 of the cement extraction tool 102 are shown in FIG. It is hoisted via a hanging member 118 such as a wire rope by a column machine that is not installed. With this lifting, the concrete 113 taken into the inner space 116 of the cement removal tool 102 and hardened is concrete 113 hardened in the ready-made pile 101 and concrete 113 hardened in the gap 115 between the ready-made pile 101 and the cement removal tool 102. From the paper tube 104 and peeled off the hardened concrete 113 in the gap 115 between the ready-made pile 101 and the cement extraction tool 102, and the upper side of the ready-made pile 101 A hole 119 is formed therein.

However, when the planned depth of the hole 119 is, for example, 3 m, the cement extraction tool 102 cannot be easily removed. In addition, even when the cement removal tool 102 can be removed, as shown in FIG. 3B, a gap 115 between the ready-made pile 101 and the cement removal tool 102 exists between the hole 119 and the inner surface of the ready-made pile 101. The hardened concrete 113 remains. The remaining concrete 113 is generally different in quality from the concrete 113 used when constructing the upper structure. Therefore, the concrete 113 hardened and left in the gap 115 between the ready-made pile 101 and the cement extraction tool 102 is shaved by an auger drill, and further removed by keren or the like. However, when the remaining concrete 113 had a hole diameter of 600 mm and a depth of 1 m, it was difficult to remove the remaining concrete 113 with kerosene or the like.

JP-A-5-247930

The present invention has been made in consideration of the above background art, the hole for pouring into the ready-made pile part of the concrete structure to be built on top of the prefabricated pile as medium-packed concrete inside the prefabricated pile To provide a method for removing solidified material at the pile head of a ready-made pile, which facilitates the removal of solidified material consisting of cement components filled in the ready-made pile during the setting process of the existing pile. Aim.

The present invention, in order to form a hole for pouring into the ready-made pile as medium-packed concrete part of the concrete structure to be built on top of the prefabricated pile inside the pile head of the ready-made pile, drilling the ground In the unhardened concrete poured into the excavated hole, a hollow prefabricated pile continuous in the pile axis direction with both ends in the pile axis direction opened is sunk from one end side, and by this squatting, the prefabricated pile is filled. was as uncured filling concrete becomes solidified material comprising a cement component of the removable poor compounding, medium filled water from the other end of the prefabricated pile uncured filling concrete is filled in the prefabricated pile After pouring the concrete to the casting position and confirming that water overflows from the borehole to the ground, the solidified cement component, which was poorly compounded by this water injection, was poured from the pile head of the ready-made pile. when removing, auger Using a drilling head whose outer diameter is smaller than the inner diameter of the ready-made pile as the drilling head of the drilling machine, excavating the solidified material while contacting a part of the periphery of the drilling head with the inner surface of the ready-made pile It is characterized by being removed .

The present invention provides a solidified product composed of a poorly-mixed cement component capable of removing the filled concrete by injecting water into the uncured filled concrete filled in the ready-made pile in the process of setting the ready-made pile. Since the solidified material composed of the cement component is removed from the pile head of the ready-made pile, it can be easily removed even after the concrete filled in the ready-made pile hardens. In the present invention, it is not necessary to use a dedicated pipe for water injection if water is injected into the unhardened filled concrete filled in the ready-made pile by using a drill rod. In the present invention, when injecting the water into the uncured filled concrete filled in the ready-made pile, the water is poured to a position where the concrete filling is poured, and a solidified product composed of a poorly-mixed cement component is obtained. The integrity of the concrete structure built on top of the ready-made pile and the ready-made pile after removal is increased. In the present invention, if the solidified material composed of the poorly-mixed cement component is removed by an auger drill, the solidified material composed of the poorly-mixed cement component can be easily removed even if the hole is deep.

  The summary of the invention does not list all the features required of the invention, and a sub-combination of these features may also be an invention.

Fig. 3 shows a method for removing solidified material from a pile head of a ready-made pile according to the first embodiment for carrying out the present invention. FIG. 4C is a longitudinal sectional view showing the state before the removal work, and FIG. The work of the pre-process than the method of removing the solidified material from the pile head of the ready-made pile according to the first embodiment for carrying out the present invention is shown, a diagram is a longitudinal sectional view showing the work of excavating the excavation hole in the ground, FIG. 2B is a longitudinal sectional view showing an operation of pouring unhardened concrete into the excavation hole, and FIG. 2C is a longitudinal sectional view showing an operation of setting a ready-made pile into the uncured concrete poured into the excavation hole. The conventional method of forming a hole inside a ready-made pile is shown, and the figure a shows the work in which a ready-made pile equipped with a cement extraction tool is laid in unhardened concrete poured into a drilled hole drilled in the ground. FIG. 4B is a longitudinal sectional view showing an operation of forming a hole in the upper side of a ready-made pile by lifting a cement removal tool.

A method for removing a solidified material composed of a cement component that has flowed (filled) and hardened into a pile head in the process of setting the ready-made pile 1 according to the first embodiment for carrying out the present invention, for example, a filled concrete as a solidified material, is shown in FIG. 1 includes a preparatory work for removing the filled concrete shown in FIG. 1A and a preparatory work for removing the filled concrete shown in FIGS. 1B and 1C. First, the preparation work for removing filled concrete will be described with reference to FIG. The preparation work for the removal of the filled concrete from the ready-made pile 1 shown in FIG. 1A is performed by placing the pile shaft in the unhardened concrete 4 that has been poured into the excavation hole 3 that has been drilled to install the ready-made pile 1 on the ground 2. A hollow prefabricated pile 1 that is continuous in the axial direction and that is open at both ends is sunk from one end 1a of the prefabricated stake 1 and is taken into the pile head inside the prefabricated stake 1 by this squatting. Water 6 is injected from the other end 1b of the ready-made pile 1 into the unhardened filled concrete 5 at the pile head inside the ready-made pile 1 so that the hard-filled concrete 5 becomes a poor mixture that can be removed. Since the filled concrete 5 in the interior of the ready-made pile 1 hardens as it is poorly mixed and becomes a solidified material composed of a poorly-mixed cement component, even after the filled concrete 5 is hardened, it becomes a solidified material composed of the poorly-mixed cement component. Filling co The cleat 5 may be easily removed.

The uncured concrete 4 of the first embodiment is a concrete having fluidity, but may be a hydraulic member made of a cement component such as cement milk or mortar. When the water 6 is injected, after the drilling head 11 is removed from the tip of the drilling rod 7 in the auger drilling machine on the ground, the tip of the drilling rod 7 is removed from the ground by the auger drilling machine. Holes in unhardened filled concrete 5 inside 1 ( holes for casting a part of the concrete structure to be built on top of the ready-made pile 1 into the ready-made pile 1 as filling concrete) 12 (FIG. 1 ) (See FIG. C)) Water 6 is inserted from the tip of the excavating rod 7 which is inserted into the filled concrete 5 and rises, and the unhardened material inside the ready-made pile 1 is inserted. After pouring into the filled concrete 5, it is raised. At that time, it is desirable that water is to confirm that the overflow on the ground from the borehole 3. The excavating rod 7 is hollow so that water 6 and unhardened concrete 4 can pass downward from the ground via the inside of the excavating rod 7. The planned depth at which the concrete in the hole 12 is cast is synonymous with the position at which the concrete is cast. If water is poured to the position where the concrete filling is poured as described above, it is built in the hole 12 after the poorly filled concrete 5 shown in FIG. In the case where a part of the concrete structure to be cast is cast as the filled concrete, the integrity of the filled concrete and the ready-made pile is increased.

  The excavation hole 3 is composed of an upper vertical hole 8 and an expanded root consolidation hole 9 as a lower expanded bottom. The bottom portion of the enlarged root consolidation hole 9 is a support layer as a hard ground 2 capable of withstanding the weight of an unillustrated superstructure constructed on the ready-made pile 1. The ready-made stake 1 is illustrated as one, but is not limited to one. The ready-made stake 1 in which the tip stake 15 (see FIG. 2) and the plurality of connection stakes 16 (see FIG. 2) are connected. Consists of

  In addition, before the preparatory work for the removal of the filled concrete of the ready-made pile 1 shown in FIG. 1A is performed, the process until the excavation hole 3 is excavated in the ground 2 and the ready-made pile 1 is set in the excavation hole 3. Will be described with reference to FIG.

  Next, with reference to FIG. 1B and FIG. 1C, a description will be given of the operation of removing the filled concrete according to the first embodiment for carrying out the present invention. The packed concrete removal operation shown in FIGS. 1B and 1C is performed as a post-process of the packed concrete removal preparation operation shown in FIG. 1A.

As shown in FIG. 1 b, after excavating the ground 2 so that a part of the pile head of the ready-made pile 1 is exposed, and removing the concrete around and above the pile head, the pile 2 is removed. An auger drilling machine having a drilling head 11 attached to the tip of the drilling rod 7 above the head is prepared. The outer diameter of the excavating head 11 is smaller than the inner diameter of the ready-made pile 1. The lowering and rotating movements of the drilling rod 7 cause the drilling head 11 to rotate in the horizontal direction about the center line extending in the vertical direction of the drilling head 11 as a center of rotation and to descend, so that the drilling head 11 From this, a solidified material composed of a poorly-mixed cement component as a poorly-mixed filled concrete 5 existing inside the ready-made pile 1 is excavated to a planned depth of the hole 12 (see FIG. 1C). The excavated material of the filled concrete 5 generated at this time is sucked up to the ground by a sand pump installed on the ground.

Since the outer diameter of the excavation head 11 is smaller than the inner diameter of the ready-made pile 1, the excavation head 11 not only rotates horizontally and descends linearly during excavation, but also The drilling head 11 rotates while rotating in the horizontal direction so that the center line extending in the vertical direction of the drilling head draws a circle in a horizontal plane, and a part of the peripheral portion of the drilling head 11 contacts the inner surface of the ready-made pile 1 as a guide. Thereby, the filled concrete 5 can be removed without remaining on the inner surface of the ready-made pile 1. By the excavation by the excavation head 11, the hole 12 is formed in the pile head inside the ready-made pile 1 as shown in FIG.

  The poorly filled concrete 5 existing inside the ready-made pile 1 may be in an unhardened state or a hardened state. For example, from several months to one year after the completion of the preparatory work for removing the pre-filled concrete of the ready-made pile 1 shown in FIG. 1A from the situation at the site, the ready-made pile 1 shown in FIG. 1B and FIG. It was confirmed that the above-mentioned filled concrete 5 could be removed even if the packed concrete removing operation was performed.

  In FIG. 1, the ready-made pile 1 is illustrated as one, but is not limited to one, and as shown in FIG. And a connection stake 16 having both ends open and connected coaxially on the connection pile 15. One or more connection piles 16 may be used. When there are a plurality of connection piles 16, the plurality of connection piles 16 are coaxially connected to each other.

  Referring to FIG. 2, as a pre-process of the preparatory work for removing filled concrete according to the first embodiment for carrying out the present invention, a drilling hole 3 for installing a ready-made pile 1 on the ground 2 is excavated, and a ready-made A process until the pile 1 is laid will be described.

  In FIG. 2A, the excavating head 11 rotates horizontally and descends about a center line extending in the vertical direction of the excavating head 11 due to the downward movement and the rotational movement of the excavating rod 7 in the auger drilling machine. Accordingly, the ground 2 is excavated while the excavation hole 3 composed of the upper vertical hole 8 and the lower enlarged root compaction hole 9 is supplied with a stable liquid such as bentonite. The bottom of the expanded root consolidation hole 9 is a support layer as the hard ground 2 that can withstand the weight of the upper structure constructed on the ready-made pile 1.

  Next, as shown in FIG. 2B, after the excavation of the enlarged root consolidation hole 9 is completed, the uncured concrete 4 passes from the ground through the inside of the excavation rod 7 and the vertical hole from the enlarged root consolidation hole 9 side. It is poured into 8. As the amount of uncured concrete 4 poured into the vertical hole 8 rises, the excavating rod 7 rises. When the amount of uncured concrete 4 to be poured into the vertical hole 8 reaches the planned amount, the casting of the uncured concrete 4 into the vertical hole 8 is completed.

  Then, as shown in FIG. 2C, after the tip pile 15 and the connection pile 16 are laid down in the uncured concrete 4 inside the drilling hole 3 by their own weight, they are rotated by a drilling rod (not shown) or the like. Given and laid down to the planned depth. The submerged pile 1 composed of the tip pile 15 and the connection pile 16 is settled to the planned depth, and the tip pile 15 is fixed to the unhardened concrete 4 in the expanded rooting hole 9, and the submerged pile 1 is set in the excavation hole 3. Is completed. After that, while the unhardened concrete 4 does not become hard, while the excavating rod 7 shown in FIG. 1A can be inserted into the unhardened concrete 4, the ready-made pile 1 shown in FIG. Work is performed.

  As described above, the present invention has been described using the embodiment, but the technical scope of the present invention is not limited to the scope described in the embodiment. It will be apparent to those skilled in the art that various changes or improvements can be made to the embodiment. It is apparent from the appended claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Ready-made pile 1b The other end side 1a of the ready-made pile 1 One end side of the ready-made pile 1 Ground 4 Concrete 5 Filling concrete 6 Water 7 Drilling rod 8 Vertical hole 9 Enlarged root hole 11 Drilling head 12 hole 15 Tip pile 16 Connection pile

Claims (2)

To form a hole for pouring into the ready-made pile as medium-packed concrete part of the concrete structure to be built on top of the prefabricated pile inside the pile head of the ready-made pile, drilled hole which is drilled into the ground In the uncured concrete poured into the pile, a hollow ready-made pile continuous in the pile axis direction with both ends in the pile axis direction opened is sunk from one end side, and the unhardened as the solidified material filling concrete consists cement component removable poor compounding, Da設medium packed concrete water from the other end of the prefabricated pile uncured filling concrete is filled in the prefabricated pile by injecting position to which, after the water was confirmed to overflowing on the ground from the borehole, in removing the solidified material comprising a cement component became poor mixing at the injection of the water from the pile head of the ready-made pile Auger drilling machine Outer diameter as the cutting head by using the drilling head of a small size than the inner diameter of the ready-made pile, that a part of the periphery of the drilling head has been removed by drilling solidified product while in contact with the inner surface of the prefabricated pile A method for removing solidified material from the pile head of a ready-made pile. The method for removing solidified material from a pile head of a ready-made pile according to claim 1, wherein water is poured into the uncured filled concrete filled in the ready-made pile using a drill rod .

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