JP2017172247A - Removal method of solidification object in pile head part of precast pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a removal method of a solidification object of a pile inside in a pile head part of a precast pile, for easily removing the solidification object composed of a cement component filled in the precast pile in a sinking process of the precast pile, for forming an upper structure establishing hole for installing a part of a concrete structure constructed in an upper part of the precast pile even in the precast pile as infilling concrete.SOLUTION: A precast pile 1 of a both-end opening shape is sunk from one end side 1a of the precast pile 1 in uncured concrete 4 poured into an excavation hole 3 excavated for installing the precast pile 1 in a ground 2, and water 6 is injected from the other end side 1b of the precast pile 1 into uncured filling concrete 5 so as to become lean-mix capable of removing the uncured filling concrete 5 taken in a pile head part on the inside of the precast pile 1 by this sinking, and an upper structure establishing hole 12 is formed by removing the filling concrete 5 becoming the lean-mix by injection of this water up to a position for placing infilling concrete from aboveground.SELECTED DRAWING: Figure 1

Description

  In order to increase the integrity of the concrete structure built on the upper part of the ready-made piles such as columns, walls, and foundations, the present invention places a part of the concrete structure in the ready-made piles as infilled concrete. It is related with the removal method of the solidified material which consists of a cement component with which the ready-made pile was filled in the settling process of a ready-made pile, in order to form the hole for superstructure establishment of No. in the pile head inside a ready-made pile.

  With reference to FIG. 3, a method of forming the upper structure establishment hole 119 such as a support column disclosed in Patent Document 1 inside the ready-made pile 101 will be described. As shown in FIG. 3a, a cement removal tool 102 is installed in the upper side of a ready-made pile 101 having an opening at both ends. The cement extraction 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 has a bent portion 107 above the paper tube 104 of the pair of support members 103. Both end portions of the penetrating stop rod 108 are attached to the upper end surface of the ready-made pile 101. The ready-made pile 101 in which the cement removal tool 102 is installed in this way is excavated as it is set in the unhardened concrete 113 poured into the excavation hole 112 excavated in the ground 111 from one end side. The uncured 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 uncured concrete 113 is cured and hardened, the stop rod 108 is removed from the ready-made pile 101, and the pair of support members 103 of the cement removal tool 102 are illustrated. It is lifted through a suspension member 118 such as a wire rope by a construction machine that is not used. With this lifting, the concrete 113 that has been taken in and hardened in the inner space 116 of the cement removal tool 102 has hardened in the ready-made pile 101 and the concrete 113 hardened in the gap 115 between the ready-made pile 101 and the cement removal tool 102. The inner covering 105 and the outer covering 106 are peeled off from the paper tube 104 and peeled off from the concrete 113 hardened in the gap 115 between the ready-made pile 101 and the cement removal tool 102, and the upper side of the ready-made pile 101. An upper structure establishment hole 119 is formed therein.

  However, when the planned depth of the upper structure establishment hole 119 is, for example, 3 m, the cement removal tool 102 cannot be easily removed. Further, even when the cement removal tool 102 can be removed, the ready-made pile 101 and the cement removal tool 102 are between the upper structure establishment hole 119 and the inner surface of the ready-made pile 101 as shown in FIG. The hardened concrete 113 remains in the gap 115. The remaining concrete 113 is generally different in quality from the concrete 113 used in constructing the superstructure. Therefore, the concrete 113 which has hardened and remains in the gap 115 between the ready-made pile 101 and the cement removal tool 102 is shaved with an auger drilling machine and further removed with kelen or the like. However, when the remaining concrete 113 has a hole diameter of 600 mm and a depth of 1 m, it is difficult to remove the remaining concrete 113 with kelen or the like.

JP-A-5-247930

  The present invention has been made in view of the above-described background art, and a hole for establishing an upper structure for placing a part of a concrete structure constructed on an upper portion of an already-made pile also as an inside-filled concrete in the already-made pile. In the pile head inside the ready-made pile, it is easy to remove the solidified material consisting of the cement component filled in the ready-made pile during the set-up process of the ready-made pile. The purpose is to provide the removal method.

  The present invention forms a hole for establishing an upper structure in a pile head inside the ready-made pile for placing a part of the concrete structure constructed on the upper part of the ready-made pile as an inside-filled concrete also in the ready-made pile. For this purpose, a ready-made pile with open ends is submerged from one end side in unhardened concrete poured into the excavation hole excavated in the ground, and the unhardened filled concrete filled in the ready-made pile by this sinking Water is poured from the other end of the ready-made pile into the uncured filled concrete filled in the ready-made pile so that it becomes a solidified product composed of a poorly-mixed cement component that can be removed. The solidified material composed of the cement component is removed from the pile head of the ready-made pile.

  The present invention is a solidified product comprising a poorly blended cement component capable of removing the filled concrete by injecting water into the uncured filled concrete filled in the ready-made pile during the set-up process of the ready-made pile. Since the solidified material composed of the blended cement component is removed from the pile head of the ready-made pile, it can be easily removed even after the filled concrete in the ready-made pile is cured. In the present invention, it is not necessary to use a dedicated pipe for pouring water if the excavation rod is used when pouring into uncured filled concrete filled in the ready-made pile. In the present invention, when water is poured into unfilled filled concrete filled in the above-mentioned ready-made piles, if the water is poured up to a position where medium-filled concrete is placed, The integrity of the concrete structure built on top of the ready-made pile after removal and the ready-made pile is increased. In the present invention, if the solidified material composed of the poorly blended cement component is removed by an auger drilling machine, the solidified material composed of the poorly blended cement component is easily removed even if the upper structure establishment hole is deep. be able to.

  The summary of the invention does not list all necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

The solidified material removal method in the pile head of the ready-made pile concerning the form 1 for implementing this invention is shown, a figure is a longitudinal cross-sectional view of the filling concrete removal preparation work of a ready-made pile, b figure is the filling concrete of a ready-made pile The longitudinal cross-sectional view which showed before the removal work, and c figure are the longitudinal cross-sectional views which showed the filling concrete removal work of a ready-made pile. The work of a previous process is shown rather than the removal method of the solidified material in the pile head of the ready-made pile concerning form 1 for carrying out the present invention, a figure is a longitudinal section showing work which excavates an excavation hole in the ground, Fig. b is a longitudinal sectional view showing the operation of pouring uncured concrete into the excavation hole, and Fig. c is a longitudinal sectional view showing the operation of laying a ready-made pile on the uncured concrete poured into the excavation hole. A conventional method for forming a hole for establishing a superstructure inside a prefabricated pile is shown. FIG. A shows a prefabricated pile equipped with a cement removal tool in unhardened concrete poured into a drilling hole excavated in the ground. The longitudinal cross-sectional view which showed the operation | work set up, FIG. B is the longitudinal cross-sectional view which showed the operation | work which forms the hole for upper structure establishment in the upper side of a ready-made pile by lifting of a cement extraction tool.

  The removal method of the solidified material which consists of the cement component which flowed into the pile head in the setting process of the ready-made pile 1 which concerns on form 1 for implementing this invention (filling) hardening, for example, the filling concrete as a solidified material, 1 consists of a filling concrete removal preparation work shown in FIG. 1a and a filling concrete removal work shown in FIGS. 1b and 1c. First, the filling concrete removal preparation work will be described with reference to FIG. The preparatory work for removing the filled concrete of the ready-made pile 1 shown in FIG. 1A is performed by opening both ends in the unhardened concrete 4 poured into the excavation hole 3 excavated to install the ready-made pile 1 on the ground 2. The shape ready-made pile 1 is sunk from one end side 1a of the ready-made pile 1, so that the uncured filled concrete 5 taken into the pile head inside the ready-made pile 1 becomes a poor compound that can be removed. By injecting water 6 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, the filled concrete 5 inside the ready-made pile 1 is hardened while being poorly mixed. Thus, since the solidified product made of the poorly blended cement component is formed, the filled concrete 5 as the solidified product composed of the poorly blended cement component can be easily removed even after the filled concrete 5 is hardened.

  The uncured concrete 4 of the first embodiment is fluid concrete, but may be a hydraulic member made of cement components such as cement milk and mortar. In addition, when water 6 is injected, after the excavation head 11 is removed from the tip of the excavation rod 7 in the auger drilling machine on the ground, the tip of the excavation rod 7 is ready-made from the ground with the auger drilling machine. 1 is inserted into the uncured filled concrete 5 in the interior 1 to the planned depth for placing the filled concrete 12 in the upper structure establishment hole 12 (see FIG. 1 c), and inserted into this filled concrete 5 Then, water 6 is raised from the tip of the excavating rod 7 that is raised and then poured into the uncured filled concrete 5 inside the ready-made pile 1 after completion. At that time, it is desirable to confirm that the water overflows from the excavation hole 3. The excavation rod 7 is hollow so that the water 6 and the uncured concrete 4 can be passed from the ground via the inside of the excavation rod 7 to the lower side. The planned depth for placing the filling concrete for the upper structure establishment hole 12 is synonymous with the position for placing filling concrete. If water is poured up to the position where the filled concrete is placed as described above, the prefabricated pile is formed in the upper structure establishment hole 12 after the poor blended concrete 5 shown in FIG. When a part of the concrete structure constructed on the upper part of 1 is placed as medium-filled concrete, the integrity of the medium-filled concrete and the ready-made pile is increased.

  The excavation hole 3 includes an upper vertical hole 8 and an enlarged rooting hole 9 as a lower bottom enlarged portion. The bottom of the enlarged rooting hole 9 is a support layer as a hard ground 2 that can withstand the weight of an upper structure (not shown) constructed on the ready-made pile 1. The ready-made pile 1 is illustrated as one, but is not limited to one, and the ready-made pile 1 in which a tip pile 15 (see FIG. 2) and a plurality of connecting piles 16 (see FIG. 2) are connected. It consists of.

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

  Next, the filling concrete removing operation according to the first embodiment for carrying out the present invention will be described with reference to FIGS. The filled concrete removal work shown in FIGS. 1b and 1c is performed as a post-process of the filled concrete removal preparation work shown in FIG. 1a.

  As shown in FIG. 1b, 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 An auger drilling machine in which the excavation head 11 is attached to the tip of the excavation rod 7 above the head is prepared. The outer diameter of the excavation head 11 is smaller than the inner diameter of the ready-made pile 1. Then, as the excavation head 11 rotates and moves downward, the excavation head 11 rotates in the horizontal direction around the center line extending in the vertical direction of the excavation head 11 and moves downward. To excavate the solidified material composed of the poorly mixed cement component as the poorly filled concrete 5 existing inside the ready-made pile 1 to the planned depth of the upper structure establishment hole 12 (see FIG. 1 c). . 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, during the excavation, the excavation head 11 not only rotates in the horizontal direction and descends linearly, but also the excavation head 11 The excavation head 11 turns while rotating in the horizontal direction so that the center line extending vertically in the horizontal plane is circular, and a part of the peripheral edge of the excavation head 11 contacts the inner surface of the ready-made pile 1 as a guide. Thus, the filled concrete 5 can be removed without remaining on the inner surface of the ready-made pile 1. By excavation by such excavation head 11, an upper structure establishment hole 12 is formed in the pile head inside the ready-made pile 1 as shown in FIG.

  The impregnated filled concrete 5 existing inside the ready-made pile 1 may be in an uncured state or a cured state. For example, the ready-made pile 1 shown in FIGS. 1 b and c after several months to one year from the completion of the preparatory work for removing the filled concrete of the ready-made pile 1 shown in FIG. It was confirmed that the above-mentioned filled concrete 5 could be removed even when the filled concrete removal work 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. It is comprised from the connection pile 16 of the both ends opening type connected on 15 coaxially. One or more connecting piles 16 may be used. When there are a plurality of connection piles 16, the plurality of connection piles 16 are connected to each other coaxially.

  Using FIG. 2, as a pre-process for filling concrete removal preparatory work according to Embodiment 1 for carrying out the present invention, an excavation hole 3 for installing the ready-made pile 1 on the ground 2 is excavated, and the excavation hole 3 is ready-made. A process until the pile 1 is sunk will be described.

  In FIG. 2 a, the excavation head 11 rotates and descends in the horizontal direction about the center line extending in the vertical direction of the excavation head 11 by the downward movement and the rotation movement of the excavation rod 7 in the auger drilling machine. Accordingly, the ground 2 is excavated while the excavation hole 3 including the upper vertical hole 8 and the lower enlarged rooting hole 9 is supplied with a stabilizing liquid such as bentonite. The bottom of the enlarged root hole 9 is a support layer as a hard ground 2 that can withstand the weight of the upper structure constructed on the ready-made pile 1.

  Next, as shown in FIG. 2 b, after the excavation of the enlarged rooting hole 9 is completed, the uncured concrete 4 passes through the inside of the excavation rod 7 from the ground and is extended from the side of the enlarged rooting hole 9 to the vertical hole. It is poured into 8. As the amount poured into the vertical holes 8 of the uncured concrete 4 rises, the excavation rod 7 rises. When the amount poured into the vertical hole 8 of the uncured concrete 4 reaches the planned amount, the pouring of the uncured concrete 4 into the vertical hole 8 is completed.

  Then, as shown in FIG. 2c, the tip pile 15 and the connecting pile 16 are rotated by an unillustrated excavating rod or the like after being set on the uncured concrete 4 inside the excavating hole 3 by its own weight. Given, it will be submerged to the planned depth. By laying the ready-made pile 1 composed of the tip pile 15 and the connecting pile 16 to the planned depth, the tip pile 15 is fixed to the uncured concrete 4 of the enlarged rooting hole 9 and the ready-made pile 1 is set in the excavation hole 3. Is completed. Thereafter, while the uncured concrete 4 does not become hard and the excavation rod 7 shown in FIG. 1a can be inserted into the uncured concrete 4, preparation for removing the filled concrete of the ready-made pile 1 shown in FIG. Work is performed.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the embodiment. It is apparent from the claims that the embodiments added 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 2 of the ready-made pile 1 Ground 4 Concrete 5 Filled concrete 6 Water 7 Drilling rod 8 Vertical hole 9 Expansion rooting hole 11 Drilling head 12 Upper structure establishment hole 15 Tip Pile 16 Connection pile

Claims (4)

  In order to form a hole in the pile head inside the ready-made pile to form a hole for setting up the upper structure for placing a part of the concrete structure built on the upper part of the ready-made pile into the ready-made pile as filled concrete, In the unhardened concrete poured into the excavation hole drilled in, a pre-made pile with open ends is submerged from one end side, and this pre-installation can remove the unhardened filled concrete filled in the pre-made pile Cement that is poorly blended by injecting water into the uncured filled concrete filled in the prefabricated pile from the other end of the prefabricated pile so that it becomes a solidified product composed of the blended cement component The removal method of the solidified material in the pile head of a ready-made pile characterized by removing the solidified material which consists of a component from the pile head of a ready-made pile.   The method for removing a solidified product from a pile head of a prefabricated pile according to claim 1, wherein the excavation rod is used when pouring the uncured filled concrete filled in the prefabricated pile.   3. The ready-made article according to claim 1, wherein when water is poured into uncured filled concrete filled in the ready-made pile, the water is poured up to a position at which intermediate-filled concrete is placed. Method of removing solidified material from the pile head.   The removal method of the solidified substance in the pile head of the ready-made pile in any one of the Claims 1 thru | or 3 which removes the solidified substance which consists of the said poor mixing | blending cement component with an auger drilling machine.

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