JP2016217023A - Installation method and installation device for joined pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation method and an installation device for a joined pile that reduces a number of processes performed on the joined pile.SOLUTION: An installation method for a joined pile is for installing a joined pile 20 in a vertical hole 101 for installation, and includes: a lower pile part supporting step in which a lower pile part 21 that forms a part of the joined pile 20 is hung and supported by a hanging member 7, while at least a part of the lower pile part 21 is inserted into the vertical hole 101; a pile connection step in which a short pile 27 is connected on top of the lower pile part 21 being supported in the lower pile part supporting step; and a hanging and lowering step in which the lower pile part 21 and the short pile 27 connected to each other in the pile connection step are hung and lowered into the vertical hole 101, by sending out the hanging member 7. A connection 13 is located inside the vertical hole 101 in the lower pile part supporting step and the hanging and lowering step, the connection being at a supported position of the lower pile part 21 via the hanging member 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for building a joint pile and a building device.

  Conventionally, as a technique in such a field, an erection method described in Patent Document 1 below is known. In this construction method, the pile head of the lower pile part inserted in the vertical hole is fixed on the ground, the lower pile part is temporarily received, the upper pile part is connected on the lower pile part, and the pile head is fixed. The procedure of releasing and lowering the lower pile portion into the vertical hole is repeated, and the joint pile is built into the vertical hole while the short pile is connected. As a method of fixing the lower pile part on the ground, a through hole is provided in the pile head, a method of inserting a hairpin member supported by the ground receiving base into the through hole, and a bracket is attached to the pile head by welding or bolting. There is a method.

JP 62-029615

  However, according to this construction method, it is necessary to process the pile head as described above every time the upper pile portion is connected. Processing such a pile head is time-consuming and causes an increase in construction cost. Moreover, the processing to a joint pile may reduce the performance of the completed joint pile. For example, the through hole for the hairpin member reduces the cross-sectional area of the pile, and in the case of a pile made of concrete, it is not easy to fill the through hole. Moreover, in the method of attaching the bracket to the pile head, there is a possibility that the base material of the pile is deteriorated by welding, or the cross-sectional area of the pile is reduced by the amount of the bolt hole for the bracket. Therefore, it is desirable to reduce the number of processes applied to the joint pile as described above as much as possible.

  An object of this invention is to provide the construction method and construction apparatus of a joint pile which reduce the processing process given to a joint pile.

  The construction method of the joint pile of the present invention is a construction method of the joint pile in which the joint pile is built in the vertical hole for construction, and the lower pile portion forming a part of the joint pile is A lower pile portion supporting step that is supported by being suspended by a suspension member with at least a part inserted in the vertical hole, and an upper pile portion on the lower pile portion that is supported in the lower pile portion supporting step A pile connection step for connecting the lower pile portion and the upper pile portion connected to each other in the pile connection step, and a suspension step for sending the suspension member and hanging it in the vertical hole, and supporting the lower pile portion In the process and the suspension process, the support position of the lower pile portion via the suspension member is located in the vertical hole.

  In this erection method, since the support position of the lower pile part via the suspension member is located in the vertical hole, in the lower pile part support step, the lower pile part is fixed by fixing the suspension member at the suspension source. Can be provisionally accepted. The pile connection process is performed in the provisionally received state, and then the suspension process can be performed by feeding the suspension member. Thus, since the support position of the lower pile part via a suspension member is located in a vertical hole, there is no need to fix the pile head of a lower pile part on the ground for temporary reception. Therefore, it is not necessary to perform processing for provisional reception on the lower pile portion every time the upper pile portion is connected, and processing processing applied to the joint pile can be reduced.

  Specifically, in the lower pile support process and the suspension process, there is a lower pile support disk suspended in the vertical hole by a suspension member inserted into the vertical hole from the ground opening of the vertical hole. It is good also as the lower pile part being mounted on the lower pile support board.

  In the hanging process, the hanging member may be fed by controlling the feeding speed of the hanging member and the tension of the hanging member.

  In addition, the vertical hole is inclined with respect to the vertical direction, and the lower pile portion is supported by a plurality of suspension members in the lower pile portion supporting step, and the upper portion of the lower pile portion is grounded in the hanging step. By grasping, the displacement of the upper part of the lower pile part in the radial direction is restricted and the movement of the lower pile part in the extending direction is allowed, and the lower pile part is controlled while individually controlling the tension of a plurality of suspension members. May be lowered.

  According to this structure, a lower pile part can be supported in the state inclined with respect to the perpendicular direction by providing different tension | tensile_strength to several suspension members. Therefore, it can respond to the erection of diagonal piles.

  The joint pile erection device according to the present invention is a joint pile erection device for constructing a joint pile in a vertical hole for erection, and a lower pile part forming a part of the joint pile is connected to the lower pile part. A lower pile portion supporting portion that is suspended and supported by the suspension member in a state in which at least a part is inserted into the vertical hole, and a suspension member driving device that winds and sends the suspension member. In a pile support part, the support position of the lower pile part via a suspension member is located in a vertical hole.

  In addition, the lower pile support portion is suspended in the vertical hole by a suspension member inserted into the vertical hole from the ground opening of the vertical hole, and a lower pile support disk on which the lower pile portion is placed It is good also as having.

  Further, in the joint pile erection device of the present invention, the vertical hole is inclined with respect to the vertical direction, and the lower pile portion support portion supports the lower pile portion with a plurality of suspension members, and the lower pile portion By gripping the upper part of the lower pile part on the ground, it is possible to regulate the displacement of the upper part of the lower pile part in the radial direction and allow the movement of the lower pile part in the extending direction, and a plurality of suspension member drive devices A tension control unit that individually controls the tension of the suspension member.

  ADVANTAGE OF THE INVENTION According to this invention, the construction method and construction apparatus of a joint pile which reduce the processing process given to a joint pile can be provided.

It is sectional drawing which shows the erection apparatus and erection method which concern on 1st Embodiment. It is II-II sectional drawing in FIG. It is sectional drawing which shows the erection apparatus and erection method which concern on 2nd Embodiment. (A)-(c) is sectional drawing which shows the modification of a support position.

(First embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a built-in device 1 for a joint pile 20 according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line II-II in FIG. The erection apparatus 1 is an apparatus for erection the joint pile 20 in the erection vertical hole 101 formed vertically in the ground. The joint pile 20 constructed here is configured by connecting a plurality of short piles 23. As shown in FIG. 2, in this embodiment, the joint pile 20 is an H steel type pile, but the erection device 1 and its erection method are not limited to the H steel type piles, and are similarly applied to steel pipe piles. Applicable.

  When the built-in device 1 newly connects the short pile 23 on the lower pile portion 21, the lower pile portion 21 is inserted in the vertical hole 101 in a state where at least a part of the lower pile portion 21 is inserted. A lower pile support portion 10 is provided that is suspended and supported by the suspension member 7. As the suspending member 7, for example, a member that functions as a tension member such as a cable body can be employed. For example, a wire rope, a PC steel rod, or the like can be employed. In the following description, the case where the suspension member 7 is a wire rope will be mainly described as an example. The lower pile portion 21 is a built-in portion of the components of the joint pile 20 and is composed of a plurality of connected short piles 23. For example, in FIG. 1, the lower pile portion 21 is composed of two short piles 23, but immediately after the first short pile 23 constituting the joint pile 20 is built, the first short pile 23 Comprises the lower pile part 21 independently.

  The lower pile support portion 10 is provided above the vertical hole 101 on the inside of the upper part of the suspension base 3 and the suspension suspension base 3 for erection of the pile provided around the ground opening 103 of the vertical hole 101. A plurality of pulleys 5, a plurality of suspension members 7 extending vertically downward from each pulley 5 and inserted into the vertical hole 101 through the ground opening 103, and a lower pile support disk connected to the lower end of each suspension member 7 9 and a connecting portion 13 for connecting the suspension member 7 and the lower pile support board 9. Further, the erection device 1 is connected to the other end of each suspension member 7 and controls the suspension member drive device 11 that lifts the suspension member 7 and feeds the suspension member 7 downward, and the drive of the suspension member drive device 11. And a control device (tension control unit) 17 for controlling the feeding speed and tension of the suspension member 7. As the suspension member drive device 11, for example, a winch that winds and sends out a wire rope can be employed. When a PC steel bar is used as the suspension member 7, for example, a center hole jack fixed to the suspension base 3 can be used as the suspension member driving device 11. In the following description, the case where the suspension member driving device 11 is a winch will be mainly described as an example.

  The lower pile support board 9 is a steel member having a disk shape, for example, and is suspended in the vertical hole 101 by a plurality of suspension members 7. In addition, the planar view shape of the lower pile support board 9 may be made to correspond to the cross-sectional shape of the vertical hole 101, for example, and may be made to correspond to the cross-sectional shape of the joint pile 20. A lower pile part 21 is placed on the lower pile support board 9, and the bottom end face of the lower pile part 21 is in contact with the upper surface of the lower pile support board 9.

  As shown in FIG. 2, in this embodiment, there are three suspension members 7 that support the lower pile support board 9, but the number of suspension members 7 is not limited to this, and 3 It may be less or more than the book. In the erection device 1, the same number of pulleys 5 and suspension member driving devices 11 as the suspension members 7 are used. The connection part 13 of the lower pile support board 9 and the suspension member 7 is arrange | positioned equally in the circular periphery of the upper surface of the lower pile support board 9, for example, the well-known structure using a suspension piece and a shackle is used. It is made. Further, a slip stopper 15 is formed on the upper surface of the lower pile support board 9 to prevent the horizontal pile portion 21 from being displaced in the horizontal direction. The control device 17 can individually control the plurality of suspension member driving devices 11. As the control device 17, for example, a computer that transmits / receives a drive signal and a control signal to / from each suspension member drive device 11 can be used. As described above, in the present embodiment, the lower end of the lower pile portion 21 is suspended and supported in the vertical hole 101 by the suspension member 7 via the lower pile support board 9.

  Then, the construction method of the joint pile which concerns on embodiment is demonstrated, referring FIG.1 and FIG.2.

  First, the vertical hole 101 for pile construction is drilled in the ground. Here, the vertical hole 101 may be formed using a stand pipe. Next, the suspension base 3 is installed around the ground opening 103 of the vertical hole 101, and the necessary number of pulleys 5 are installed at the suspension position above the vertical hole 101, and the suspension member driving device corresponding to each pulley 5 is installed. 11 and the suspension member 7 are installed. Next, in the vicinity of the ground portion, each suspension member 7 is attached to the connection portion 13 of the lower pile support board 9, and the bottom end portion of the short pile 23 is fixed on the lower pile support board 9.

  Next, the suspending member 7 is sent out from the suspending member driving device 11 and the short pile 23 is built in the longitudinal hole 101 while the lower pile supporting board 9 is suspended in the longitudinal hole 101. In addition, as mentioned above, the first short pile 23 built here comprises the lower pile part 21 independently. Here, the lower pile support board 9 and the short pile 23 descend to a position where only the upper end portion of the lower pile portion 21 (short pile 23) protrudes from the ground opening 103. After the descent stops, the lower pile support board 9 and the lower pile portion 21 are suspended and supported by the suspension member 7 in a state where only the upper end portion of the lower pile portion 21 protrudes from the ground opening 103 (lower Pile support process).

  Another short pile 27 (upper pile portion) is connected to the upper end of the lower pile portion 21 that has been temporarily received by the suspension support (pile connection step). What is necessary is just to perform the connection process of this short pile 27 similarly to the connection process in a normal joint. After the connection process is completed, the suspension member 7 is sent out from the suspension member driving device 11 to suspend the lower pile support board 9 in the vertical hole 101. Thereby, the connected lower pile part 21 and the short pile 27 are suspended in the vertical hole 101 and built in the vertical hole 101. (Hanging process). Here, the operation of each suspension member driving device 11 is controlled by the control device 17, so that the feeding speed of each suspension member 7 and the tension of the suspension member 7 are controlled to be equal, and the lowering during the lowering is performed. The inclination of the pile portion 21 is suppressed. After the completion of the suspension process, only the upper end of the connected short pile 27 is in a state of protruding from the ground opening 103.

  Then, the short pile 23 is connected on the lower pile part 21 one by one by repeating the above lower pile part support process, a pile connection process, and a suspension process in order. During this time, the support position of the lower pile portion 21 is not changed, and the lower pile portion 21 is always supported at the position of the connecting portion 13 via the suspension member 7. When the lower end of the lower pile portion 21 reaches the bottom of the vertical hole 101, the joint pile 20 composed of a plurality of short piles 23 is completed. Then, the joint pile 20 is fixed by introducing fillers (not shown) such as mortar into the vertical holes 101. The suspension member 7 and the lower pile support board 9 are buried. In addition, as long as the connection of the suspension member 7 and the lower pile support board 9 in the connection part 13 can be cancelled | released by operation from the ground, you may collect | recover the suspension member 7. FIG.

  Then, the effect by the construction method of a joint pile as mentioned above is demonstrated. In this erection method, the support position (for example, connection part 13) of the lower pile part 21 via the suspension member 7 is located in the vertical hole 101 in the lower pile part support process and the suspension process. According to this structure, in the lower pile part support process, the lower pile part 21 can be temporarily received by fixing the suspension member 7 with the pulley 5 or the suspension member drive device 11, for example. The pile connection process is performed in the temporarily received state, and then the suspension process can be performed by sending out the suspension member 7. Thus, by supporting the lower pile part 21 in the support position in the vertical hole 101, there is no need to fix the pile head of the lower pile part 21 on the ground for temporary reception. In addition, there is no need to change the support position of the lower pile portion 21. Therefore, it is not necessary to perform processing for provisional reception on the lower pile portion 21 every time the short pile 23 is connected, and processing processing applied to the joint pile 20 can be reduced. As a result, the construction cost can be reduced, and the performance degradation of the joint pile 20 due to the processing being applied to the joint pile 20 can also be suppressed.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, components that are the same as or equivalent to those in the first embodiment are given the same reference numerals in the drawings, and redundant descriptions are omitted. The present embodiment relates to an erection device 51 and an erection method for erected a slant pile 70 in a vertical hole 121 inclined with respect to the vertical direction.

  As shown in FIG. 3, the erection device 220 includes a grip portion 53 installed on the suspension base 3 in addition to the configuration of the lower pile portion support portion 10 of the erection device 1 described above. The grip part 53 has a plurality of (for example, three) pulleys 55 arranged at equal intervals in the circumferential direction of the vertical hole 121. Each pulley 55 is installed so as to project from the suspension base 3 inward in the radial direction of the vertical hole 121, and is pressed against the upper portion of the lower pile portion 21 exposed upward from the ground opening 123. Each pulley 55 is rotatably supported so as to roll on the surface of the lower pile portion 21 with the displacement of the lower pile portion 21 in the extending direction. With this configuration, the gripping part 53 grips the upper part of the lower pile part 21 on the ground, restricts the radial displacement of the upper part of the lower pile part 21 and allows the lower pile part 21 to move in the extending direction. To do. That is, the grip part 53 has a function of guiding the lower pile part 21 only in the extending direction.

  A building method using the building device 200 will be described. In the pile support process in this erection method, the tension of each suspension member 7 by each suspension member drive device 11 is individually controlled by the control device 17 so that the posture of the supported lower pile portion 21 is a vertical hole. 121 can be maintained parallel to the extending direction. For example, by making the tension of the suspension member 7 located above higher than the tension of the suspension member 7 located below, the lower pile portion 21 is supported in an inclined posture in cooperation with the grip portion 53. be able to. Similarly, in the suspension process in this erection method, the control device 17 controls the feeding speed and tension of each suspension member 7 by each suspension member drive device 11, so that the supported lower pile portion 21 is supported. While maintaining the posture parallel to the extending direction of the vertical hole 121, the lower pile portion 21 can be lowered obliquely along the extending direction of the vertical hole 121. In particular, when there are three or more suspension members 7, two components (for example, a vertical rotation direction component and a horizontal rotation direction component) of the posture of the suspension member 7 can be controlled. It becomes possible to control so that the lower pile part 21 does not contact an inner wall surface. As described above, according to the erection device 200, the slant pile 70 can be erected.

  The present invention is not limited to the embodiment described above. For example, it is not essential to use the lower pile support board 9 in order to suspend and support the lower pile portion 21 and set the support position in the vertical holes 101 and 121. For example, as shown in FIGS. 4A and 4B, the suspension member 7 may be connected by providing a suspension piece (support position) 91 directly on the side surface of the lower pile portion 21. In this case, as shown in FIG. 4 (a), the hanging piece 91 may be provided on the shortest pile 23 positioned at the bottom of the short piles 23 constituting the lower pile portion 21, and FIG. As shown, the suspension piece 91 may be provided on the other short pile 23. Moreover, the system which penetrates the wall surface of the lower pile part 21 and fixes the lower end of the suspension member 7 inside the lower pile part 21 may be sufficient. Further, as shown in FIG. 4C, hooking means (supporting position) 92 such as a hook is provided at the lower end of the suspension member 7, and the hooking means 92 is engaged with the lower end of the lower pile portion 21. Thus, the suspension member 7 may be connected.

  Moreover, the lower pile part 21 may be formed by connecting the short piles 23 by a conventional method. That is, among the plurality of short piles 23 constituting the joint piles 20 and 70, the short piles 23 from the bottom to the predetermined number are connected by a conventional method, and the present invention is only for the connection of the short piles 23 above it. May be applied. Here, the conventional method is, for example, a method in which processing for provisional receiving is performed on the pile head of the lower pile portion 21 and the upper pile portion is connected by supporting the pile head of the lower pile portion 21 on the ground. Good. In the embodiment, the control device 17 controls each suspension member driving device 11 to control the feed speed and tension of each suspension member 7. However, the control of the feed speed and tension of each suspension member 7 is performed. May be executed manually.

  The present invention can be implemented in various forms including various modifications and improvements based on the knowledge of those skilled in the art including the above-described embodiments. Moreover, it is also possible to configure a modified example using the technical matters described in the above-described embodiments and the like. You may use combining the structure of each embodiment etc. suitably. For example, a PC steel rod can be used as the hanging member 7 instead of the wire rope, and a center hole jack can be used as the hanging member driving device 11 instead of the winch.

  DESCRIPTION OF SYMBOLS 1,51 ... Built-in apparatus, 7 ... Suspension member, 9 ... Lower pile support board, 10 ... Lower pile part support part, 11 ... Suspension member drive device, 13 ... Connection part (support position), 17 ... Control apparatus (Tension control part), 20 ... Joint pile, 21 ... Lower pile part, 23 ... Short pile, 27 ... Short pile (upper pile part), 53 ... Holding part, 91 ... Suspension piece (support position), 92 ... Hook Means (support position), 101, 121 ... vertical hole. 103, 123 ... Ground opening.

Claims (7)

It is a construction method of a joint pile that builds a joint pile in a vertical hole for construction,
A lower pile portion supporting step of supporting a lower pile portion forming a part of the joint pile by suspending it with a suspension member in a state where at least a portion of the lower pile portion is inserted into the vertical hole,
A pile connection step for connecting the upper pile portion on the lower pile portion in a state supported in the lower pile portion support step;
A suspension step of sending the suspension member and suspending it in the vertical hole, the lower pile portion and the upper pile portion connected to each other in the pile connection step,
In the lower pile portion support step and the suspension step, the joint pile erection method in which the support position of the lower pile portion via the suspension member is located in the vertical hole. In the lower pile support process and the suspension process,
There is a lower pile support plate suspended in the vertical hole by the suspension member inserted into the vertical hole from the ground opening of the vertical hole, and the lower pile support plate is placed on the lower pile support plate. The method for building a joint pile according to claim 1, wherein the pile portion is placed.   The method of building a joint pile according to claim 1 or 2, wherein, in the suspension step, the suspension member is delivered by controlling a delivery speed of the suspension member and a tension of the suspension member. The vertical hole is inclined with respect to the vertical direction,
In the lower pile portion supporting step, the lower pile portion is supported by a plurality of the suspension members,
In the hanging process,
By grasping the upper part of the lower pile part on the ground, while restricting the radial displacement of the upper part of the lower pile part and allowing movement in the extending direction of the lower pile part,
The construction method of the joint pile of any one of Claims 1-3 which descend | falls the said lower pile part, controlling the tension | tensile_strength of the said several suspension member separately. A pile erection device for laying a pile in a vertical hole for erection,
A lower pile portion supporting portion that supports the lower pile portion that forms a part of the joint pile, with the suspension member suspended by a suspension member, with at least a portion of the lower pile portion being inserted into the vertical hole,
A suspension member driving device for lifting and feeding the suspension member,
In the said lower pile part support part, the support position of the said lower pile part via the said suspending member is located in the said vertical hole. The lower pile support part is
The lower pile support board which is suspended in the vertical hole by the suspension member inserted into the vertical hole from the ground opening of the vertical hole, and on which the lower pile portion is placed. 5. The pile erection device according to 5. The vertical hole is inclined with respect to the vertical direction,
In the lower pile support portion, the lower pile portion is supported by a plurality of the suspension members,
By grasping the upper part of the lower pile part on the ground, the grasping part that restricts displacement in the radial direction of the upper part of the lower pile part and allows movement in the extending direction of the lower pile part,
The joint pile erection device according to claim 5 or 6, comprising a tension control unit that individually controls tensions of the plurality of suspension members by the suspension member driving device.

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