JP4181617B1 - Vibration compaction device and method for constructing cast-in-place concrete pile - Google Patents

Abstract

An object of the present invention is to provide a vibration compaction device capable of simply and quickly performing a vibrator installation operation.
A vibration compaction device B for performing vibration compaction on concrete C of a cast-in-place concrete pile, and a base portion 1 suspended from the suspension device and extending below the base portion 1 A guide portion 2 and a vibrator 3 held by the guide portion 2 are provided. The gantry 1 may be provided with a locking groove 1a having a groove shape in cross section with an open bottom surface.
[Selection] Figure 1

Description

  The present invention relates to a vibration compaction device for cast-in-place concrete piles and a method for constructing cast-in-place concrete piles.

  Patent Documents 1 and 2 disclose a technique in which a vibrator for compacting concrete is attached to a reinforcement structure (such as a reinforcing bar or a steel pipe) of a cast-in-place concrete pile. In addition, the vibrator of patent document 1 is hold | maintained at the support fixture fixed to the rebar rod, and the vibrator of patent document 2 is being fixed to the fixing reinforcement provided in the upper end of the steel pipe.

JP-A-2005-48547 Japanese Patent Laid-Open No. 9-13369

  In invention of patent document 1, it is necessary to perform the operation | work which fixes a support tool to a reinforcing bar for every pile, and in invention of patent document 2, it is necessary to perform the operation | work which fixes a vibrator to the fixing reinforcement of a steel pipe for every pile. Therefore, there is a problem that preparation takes time. Further, in the inventions of Patent Documents 1 and 2, the vibrator cannot be moved laterally, so that the degree of compaction may be uneven.

  In addition, since the support of Patent Document 1 is a disposable member that cannot be diverted to other piles, it becomes a factor that hinders cost reduction, and is left in the concrete even though it is not a structural member. For this reason, there is a possibility of adversely affecting the quality of concrete. In some cases, the support is welded to the reinforcing bar rod. In this case, the reinforcing bar that should be a ductile member is changed to a brittle member, which may adversely affect the bending strength of the pile.

  From this point of view, the present invention is a vibration compaction device for performing vibration compaction on concrete of cast-in-place concrete piles, and is a vibration compaction capable of easily and quickly installing a vibrator. It is an object of the present invention to provide an apparatus, and further to provide a construction method of a cast-in-place concrete pile that can improve the quality and strength of the cast-in-place concrete pile.

A vibration compaction device according to the present invention that solves such a problem is a vibration compaction device for performing vibration compaction on concrete of a cast-in-place concrete pile, and a gantry unit suspended from the suspension device When a plurality of guide portions extending downward of the gantry, the loosely inserted in the interior of the guide portions, characterized in that it and a vibrator which is movable in a vertical direction in the interior of the respective guide portion. In each guide part, the central side surface of the gantry part may be opened.

  According to the present invention, the vibrator can be disposed at a predetermined position simply by suspending the gantry suspended from the suspension device at a predetermined position, so that the vibrator can be easily and quickly installed. This makes it possible to eliminate the need for machining of rebar bars. In addition, according to the present invention, it is possible to recover the entire vibration compaction device from the concrete, and therefore, it can be diverted to compaction work for other cast-in-place concrete piles. Furthermore, in the present invention, the vibrator can be moved laterally only by translating or rotating the gantry, so that the degree of compaction can be made uniform.

  The cast-in-place concrete piles of the present invention include cast-in-place steel pipe concrete piles in which steel pipes are arranged at the pile heads, and continuous wall piles in which concrete is cast into groove-shaped excavation holes. .

  In this invention, it is desirable to comprise the said frame part so that it can be mounted in the upper end of the reinforcement structure which comprises a cast-in-place concrete pile. If it does in this way, since the vibrator can be positioned in the vertical direction with the upper end of the reinforcing structure as a reference, the quality of the cast-in-place concrete pile obtained is less likely to vary. In addition, a reinforcement structure is a general term for structural members other than the concrete which comprises a cast-in-place concrete pile, Comprising: It is the concept containing a reinforcing bar, a steel pipe, and a steel frame at least.

  It is preferable that the gantry is provided with a groove having a cross-sectional groove shape whose lower surface is opened, and the upper end of the reinforcing structure is inserted into the groove. If it does in this way, since the horizontal positioning of a vibration compaction device can be performed on the basis of a reinforcement structure, it will become difficult to produce variation in the quality of the cast-in-place concrete pile obtained.

  It is desirable that the gantry portion has a ring shape in plan view. If it does in this way, since it becomes possible to insert a tremey tube in the center part, before placing concrete, a vibration compaction device can be located in the upper end of a reinforcement structure.

When the pedestal part has a ring shape in plan view, at least one guide part may be fixed to the inner peripheral surface of the pedestal part. If it does in this way, since a vibrator can be located inside a reinforcement structure, it will become possible to focus and compact concrete cast in the inside of a reinforcement structure.

In addition, the vibration compaction device may be provided with a bracket protruding from the gantry, and at least one guide portion may be supported by the gantry via the bracket. If it does in this way, since it becomes possible to arrange a vibrator in the position away from a mount part, even if it is a case where a pile diameter is large, it will become possible to make the degree of compaction uniform.

Method for constructing a place concrete piles according to the present invention, the upper end of the inside after that built up the reinforcing structure, said vibration compaction device hanging hanging device reinforcing structure borehole to solve the problems mentioned above The concrete placed on the excavation hole is compacted by a plurality of vibrators equipped in the vibration compaction device, and then the vibration compaction device is lifted by the suspension device.

  According to this cast-in-place concrete pile construction method, the vibration compaction device can be positioned in the vertical direction with reference to the upper end of the reinforcing structure, so that the vibrator can be installed quickly and easily. Since the vibrator mounting accuracy can be improved, the quality and strength of the concrete can be improved. In addition, according to this method for constructing cast-in-place concrete piles, it is not necessary to process rebars and the like, and it is possible to divert the raised vibration compaction device directly to other cast-in-place concrete piles. Costs can be reduced.

Further, in the method for constructing another cast-in-place concrete pile according to the present invention that solves the above-described problem, the vibration compaction device suspended from the suspension device is disposed at the upper end of the reinforcing structure inserted into the excavation hole, While rotating or laterally moving the vibration compaction device using the suspension device, the concrete placed in the excavation hole is compacted with a plurality of vibrators equipped in the vibration compaction device, and then the vibration compaction device is used. The compacting device is lifted by the suspension device.

  According to this method for constructing cast-in-place concrete piles, the degree of compaction of the concrete can be made uniform, so that the quality and strength of the concrete can be improved.

  According to the vibration compaction apparatus of the present invention, it is possible to simply and quickly perform the vibrator installation work. Moreover, according to the construction method of the cast-in-place concrete pile concerning this invention, the quality and intensity | strength will become favorable.

  As shown in FIG. 1, a vibration compaction device B according to an embodiment of the present invention is for performing vibration compaction on concrete of a cast-in-place concrete pile, and a gantry unit 1 that has a ring shape in plan view. Are provided with guide portions 2, 2,... Extending below the gantry portion 1, and vibrators 3, 3,.

  The gantry 1 is suspended from a suspension device (such as a crane) not shown, and has a form that can be placed on the upper end of a reinforcing bar (reinforcing structure) T that constitutes a cast-in-place concrete pile. It has. The gantry 1 of the present embodiment is placed on the upper ends of the main bars t, t,... Arranged along the outer periphery of the reinforcing bar rod T, and can cover the main bars t, t,. It has a planar shape.

  Further, the gantry 1 is provided with a locking groove 1a having a cross-sectional groove shape having an open bottom surface over the entire circumference. The groove width of the locking groove 1a is larger than the outer diameter of the main bar t so that the upper end of the main bar t can be inserted into the locking groove 1a. Further, hooks 1b for hooking a linear member 1c such as a wire rope are provided on the upper surface of the gantry 1 at a plurality of locations. In addition, although there is no restriction | limiting in the material of the mount part 1, the thing of this embodiment is steel. Moreover, the gantry part 1 is divided | segmented into two members which exhibit a planar view semicircle in this embodiment. In the illustrated example, two members constituting the gantry 1 are joined via a plate, but may be joined by welding. In addition, illustration of a plate is abbreviate | omitted except FIG.

  The guide part 2 holds the vibrator 3 and is formed on the inner peripheral side of the gantry part 1 in this embodiment. The guide part 2 of this embodiment consists of steel members, and is being fixed to the internal peripheral surface of the mount part 1 by bolting. Of course, the guide portion 2 may be fixed to the gantry 1 by welding. Although there is no restriction | limiting in the cross-sectional shape of the guide part 2, the thing of this embodiment is exhibiting the cross-sectional C-shape with which the side surface of the center side of the mount part 1 was opened. In the present embodiment, the case where the four guide portions 2, 2,... Are installed at a pitch of 90 degrees is illustrated, but the number and the mounting positions of the guide portions 2 are not limited.

  The vibrator 3 imparts vibration to the fresh concrete placed in the excavation hole H (see FIG. 2B), a rod-shaped vibration part 3a that generates high-frequency vibration, and the vibration part 3a. And a power supply cable 3b for supplying electric power. As shown in FIGS. 2A and 2B, the vibrating portion 3 a is loosely inserted into the guide portion 2 and can move in the vertical direction inside the guide portion 2. In the present embodiment, since the outer diameter of the vibration part 3 a is larger than the opening width of the guide part 2, the vibration part 3 a does not escape from the opening on the side surface of the guide part 2.

  Next, an example of a method for constructing a cast-in-place concrete pile using the vibration compaction device B will be described with reference to FIG. In FIGS. 3B and 3C, the power cable 3b is not shown.

  First, as shown in FIG. 3 (a), the reinforcing bar rod T is built in the excavation hole H formed by using a drilling device (not shown), and the tremy tube P is built in the central portion of the reinforcing bar rod T. .

  Subsequently, as shown in FIG. 3 (b), the frame portion 1 of the vibration compacting device B suspended by a suspension device (not shown) is placed on the upper end of the reinforcing bar rod T while being wrapped around the tremey tube P. Then, the vibrator 3 is positioned with reference to the upper end of the reinforcing bar rod T. When the vibration compaction device B is placed on the upper end of the reinforcing bar rod T, the frame portion 1 is lowered while the center of the rack portion 1 is aligned with the center of the reinforcing bar rod T, and the main bars t, t,. Insert in 1a.

  Next, while pulling up the tremmy pipe P, fresh concrete is poured into the tremy pipe P, and the concrete is placed from the bottom of the excavation hole H.

  When the concrete is driven to the pile head, as shown in FIG. 3 (c), a plurality of vibrators 3, 3,... Equipped in the vibration compaction device B are activated, and the vibrator 3 is moved up and down as necessary. While doing so, the concrete C of the pile head is compacted. The gantry 1 moves back and forth and left and right due to the vibration of the vibrator 3, but the main bar t of the reinforcing bar rod T is inserted into the locking groove 4 (see FIG. 2B), so that the gantry portion 1 is reinforced with the reinforcing bar rod T. It will not fall off from the top edge.

  The concrete C may be compacted in a state where the vibration compaction device B is placed on the upper end of the reinforcing bar T. However, while maintaining the state where the main bar t is inserted into the locking groove 1a of the gantry 1, the gantry is maintained. The part 1 may be slightly lifted from the upper end of the reinforcing bar T, and the concrete C may be compacted while the gantry 1 is rotated or translated back and forth and left and right. If it does in this way, since vibrator 3 held by guide part 2 will move horizontally, it will become possible to make the degree of compaction in a pile head uniform.

  When compaction is completed, the vibration compaction device B is lifted by a suspension device (not shown) and removed from the pile head.

  Note that the above-described procedure may be changed as appropriate. For example, the treme tube P may be inserted after the vibration compaction device B is arranged, or after the treme tube P is pulled out (that is, after the concrete has been placed), the vibration compaction device B is installed. You may arrange.

  As described above, when the vibration compaction device B is used, the plurality of vibrators 3, 3,... Can be collectively put into a predetermined position simply by placing the gantry 1 suspended on the suspension device on the reinforcing bar T. Since it becomes possible to arrange, it becomes possible to perform the installation work of the vibrators 3, 3,. Further, since the vibration compaction device B does not have a portion that is fixed to the reinforcing bar T, the entire vibration compaction device B can be recovered from the concrete C. That is, the vibration compaction device B can be directly used for compaction work of other cast-in-place concrete piles.

  Moreover, according to the vibration compaction device B, the main reinforcement t inserted into the locking groove 1a of the gantry 1 prevents the vibration compaction device B from falling off the reinforcing bar rod T, so that construction management is easy. In addition, since the movable range of the vibration compaction device B can be limited, it is difficult for the cast-in-place concrete pile quality to vary.

  In addition, according to the vibration compaction device B, since the guide portions 2, 2,... Are formed on the inner peripheral side of the ring-shaped gantry portion 1 in plan view, the vibrators 3, 3,. Can be positioned, and therefore, the concrete placed inside the reinforcing bar T can be intensively compacted.

  Further, according to the vibration compaction device B, since the opening (slit) is provided on the side surface of the guide portion 2, the vibration 3 3 a of the vibrator 3 is vibrated even if it is accommodated in the guide portion 2. The vibration generated from the part 3a can be applied to the concrete 6.

  In addition, in this embodiment, although the base part 1 which exhibits a circle was illustrated, it may be an ellipse, a rectangle, or a polygon. Moreover, in this embodiment, although the base part 1 which exhibits a ring shape in planar view was illustrated, as long as it is a case where it uses, after removing the tremey tube P, even if it exhibits a plate shape without an opening part, it does not interfere. .

  The gantry 1 of the present embodiment has a form that can be placed on the reinforcing bar T, but is not intended to limit the form of the gantry 1. For example, although not shown, a through hole or a slit through which the main reinforcing bar t can be inserted may be formed in the gantry 1, and the outer diameter and inner diameter of the gantry 1 may be increased or decreased from those illustrated to It may be in a form that can be wrapped around or inserted into T. In this way, the vibration compaction device B can be moved up and down using the main bars t, t,... As a guide, so that the range in which compaction can be performed can be expanded.

  Moreover, although the case where the cross-sectional shape of the guide part 2 was made into C shape was illustrated in this embodiment, it is not limited to this, Although illustration is abbreviate | omitted, it is good also as trapezoid shape (the groove shape) However, it may have a closed cross-sectional shape without an opening (slit).

  Moreover, in this embodiment, although the case where the guide part 2 was directly supported by the mount part 1 was illustrated, as shown to (a) and (b) of FIG. 4, the bracket 4 which protrudes from the mount part 1 is provided. The guide portion 2 may be supported by the gantry portion 1 via the bracket 4. If it does in this way, since it becomes possible to arrange vibrator 3 in the position away from gantry part 1, even if it is a case where a pile diameter is large, it will become possible to make the degree of compaction uniform.

  4 illustrates the case where the guide portion 2 is attached to the brackets 4, 4,... Projecting toward the inside of the gantry portion 1 (that is, the center of the gantry portion 1). Of course, the guide portion 2 may be attached to the bracket projecting toward the outside.

  4 illustrates the case where the guide portion 2 is attached to the cantilever bracket 4, but as shown in FIG. 5A, the both-end support provided so as to cross the gantry portion 1 is provided. The guide portion 2 may be attached to the bracket 5. Further, as shown in FIG. 5 (b), the guide portion 2 may be attached to a cross-girder-shaped bracket 6 that covers the opening of the pedestal portion 1. Although illustration is omitted, a cross-shaped or radial shape is omitted. You may attach the guide part 2 to a bracket. Further, as shown in FIG. 6, the guide portion is provided on the bracket 7 having an annular portion 7 a provided on the inner peripheral side of the gantry portion 1, and connecting portions 7 b, 7 b,. 2 may be attached.

  Moreover, although the case where the vibration part 3a of the vibrator 3 was loosely inserted into the guide part 2 was illustrated in the present embodiment, the vibration part 3a may be fixed to the guide part 2 and may not be movable in the vertical direction. . In this case, the guide part 2 can be comprised with a rod-shaped member or a flat bar.

  Further, in this embodiment, the case where the pile head concrete C is compacted is illustrated, but if the guide portion 2 is extended below the illustrated one, the concrete below the pile head is tightened. It can also be hardened.

  In addition, although illustration is abbreviate | omitted, the vibration compaction apparatus B is applied to the cast-in-place steel pipe concrete pile which arranged the steel pipe in the pile head, the continuous wall pile formed by placing concrete in a groove-shaped excavation hole, etc. You can also. When the vibration compaction device B is placed on the upper end of the steel pipe, the groove width of the locking groove 1a of the gantry 1 is made larger than the thickness of the steel pipe, and the upper end of the steel pipe is placed in the locking groove 1a. It is desirable to insert the part.

It is a perspective view for demonstrating the vibration compaction apparatus which concerns on embodiment of this invention. It is a figure for demonstrating the vibration compaction apparatus which concerns on embodiment of this invention, Comprising: (a) is a top view, (b) is the X1-X1 sectional view taken on the line of (a). (A)-(c) is a sectional side view for demonstrating the procedure of the construction method of the cast-in-place concrete pile concerning this invention. It is a figure which shows the modification of a vibration compaction apparatus, Comprising: (a) is a top view, (b) is the X2-X2 sectional view taken on the line of (a). (A) And (b) is a top view which shows the other modification of a vibration compaction apparatus. It is a top view which shows the other modification of a vibration compaction apparatus.

Explanation of symbols

B Vibration compaction device 1 Base part 2 Guide part 3 Vibrator 4, 5, 6, 7 Bracket C Concrete T Reinforcement bar (Reinforcement structure)
H Drilling hole

Claims (9)

A vibration compaction device for performing vibration compaction on concrete of cast-in-place concrete piles,
A gantry unit suspended from a suspension device;
A plurality of guide portions extending below the gantry portion;
The loosely inserted in the interior of the guide portions, the vibration compaction apparatus characterized by comprising a vibrator which is movable in a vertical direction in the interior of the guide portions. The vibration compaction device according to claim 1, wherein each guide portion has an open side surface on the center side of the gantry portion. The gantry is vibrating compaction apparatus according to claim 1 or claim 2, characterized in that it is mounted on the upper end of the reinforcing structure which constitute the place concrete piles. The pedestal portion includes a groove having a cross-sectional groove shape whose bottom surface is open,
The vibration compaction device according to claim 3 , wherein an upper end portion of the reinforcing structure is inserted into the locking groove. The vibration compaction device according to any one of claims 1 to 4 , wherein the gantry has a ring shape in plan view. The vibration compaction device according to claim 5 , wherein at least one of the guide portions is fixed to an inner peripheral surface of the gantry portion. A bracket projecting from the gantry,
The vibration compaction device according to any one of claims 1 to 6 , wherein at least one of the guide portions is supported by the frame portion via the bracket . After that built up the reinforcing structure inside the borehole, hanging a suspended vibration compaction device in the apparatus is placed on the upper end of the reinforcing member, the vibration compaction the Da設the concrete into the wellbore A method for constructing a cast-in-place concrete pile, wherein the vibration compaction device is lifted by the suspension device after being compacted by a plurality of vibrators equipped in the device. A vibration compaction device suspended from a suspension device is disposed at the upper end of the reinforcing structure inserted into the excavation hole, and the vibration compaction device is rotated or laterally moved using the suspension device while being moved to the excavation hole. A method for constructing a cast-in-place concrete pile, wherein the placed concrete is compacted by a plurality of vibrators equipped in the vibration compaction device, and then the vibration compaction device is lifted by the suspension device.

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