JP2012031682A - Joint structure of rotary press-fitting type steel pipe pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure of rotary press-fitting type steel pipe pile, which makes bidirectional rotational transmission possible and requires no site welding, which can be mechanically connected by simple work, and which has a simple structure, while processing work of the steel pipe pile itself is small.SOLUTION: An inventive joint structure has a joint pipe 3, an upper rotation transmission member 4, and a lower rotation transmission member 5. The joint pipe 3, of which an upper end part is fitted on the outer periphery of the lower end of an upper steel pipe pile 1A among the upper steel pipe pile 1A and a lower steel pipe pile 1B to be mutually connected, is fixed at a weld part 7, and a lower part thereof covers the outer periphery of the upper end of an lower steel pipe pile 1B in a fitting state. The upper rotation transmission member 4 is fixed to the joint pipe 3 and extends below the lower end of the joint pipe. The lower rotation transmission member 5 is fixed near the upper end of the lower steel pipe pile 1B and can engage with the upper rotation transmission member 4 normally/reversely in the peripheral direction of the steel pipe pile. The upper rotation transmission member 4 has a pair of engaging material parts 4a, between which the lower rotation transmission member 5 enters.

Description

  The present invention relates to a joint structure of a rotary press-fit type steel pipe pile that becomes a pile foundation or the like that supports a structure such as a building or a house.

  Some steel pipe piles, such as pile foundations, are provided with a spiral tip blade at the lower end for press-fitting into the ground, and press-fitting while rotating. When the steel pipe pile is pressed into the ground deeply, the length of one steel pipe pile is insufficient, so a plurality of pipes are sequentially connected while being pressed into the ground. When connecting steel pipe piles, it is necessary to enable rotation transmission in the rotary press-fit type steel pipe piles. Moreover, in order to change due to an error in the press-fitting position of the steel pipe pile or to correct the inclination, it may be necessary to rotate the steel pipe pile in the reverse direction and pull it out. Therefore, it is necessary to enable transmission of reverse rotation.

  For this reason, in the rotary press-fit type steel pipe pile, the upper and lower steel pipe piles are joined by welding or the like, but on-site welding is troublesome and requires a welding engineer who is a special technician. Various mechanical joint structures have been proposed in which such problems due to field welding are eliminated, and mechanically simple and strong rotation transmission is possible without relying on welding (for example, Patent Documents). 1).

JP 2001-200355 A

  Conventional connection by field welding takes time and effort as described above, and requires a welding engineer who is a special engineer. In addition, the mechanical joint structure proposed in Patent Document 1 does not require on-site welding, but welds an annular joint material to upper and lower steel pipe piles that are connected to each other, and connects the upper and lower joint materials to each other. It shall be mechanically connected. For this reason, the intermediate steel pipe piles that are successively connected must be steel pipe piles with joint members at the upper and lower ends, and the prepared steel pipe piles have a special structure and the joint structure is complicated. In addition, the upper and lower joint members have a cross section with a phase, and the joint member itself has a complicated shape, which takes time for processing and increases costs.

  The object of the present invention is to provide rotary press-fitting that allows bidirectional rotation transmission but does not require on-site welding, can be mechanically connected by simple operations, has a simple structure, and requires only a small amount of processing of the steel pipe pile itself. It is to provide a joint structure for type steel pipe piles.

The joint structure of the rotary press-fit type steel pipe pile according to the present invention is a connection type rotary press-fit type steel pipe pile that is joined with a steel pipe pile made up of circular steel pipes one after the other and rotated against the ground. A joint structure that connects to each other,
Of the upper steel pipe pile and the lower steel pipe pile that are connected to each other, a joint pipe whose upper end is fitted and fixed to the outer periphery of the lower end of the upper steel pipe pile and the lower part is fitted to the upper outer periphery of the lower steel pipe pile; An upper rotation transmission member fixed to a part of the outer periphery of the joint pipe and extending below the lower end of the joint pipe, and a part of the outer periphery near the upper end of the non-covered portion of the lower steel pipe pile with respect to the joint pipe And a lower rotation transmission member that can be engaged with the upper rotation transmission member in the forward and reverse directions of the steel pipe pile circumferential direction. Of the steel pipe piles that are successively joined up and down, the lower steel pipe pile may have a spiral tip blade.

  Pile driving work is performed as follows. The upper end of the lower steel pipe pile pressed into the ground is covered with a joint pipe fixed to the upper steel pipe pile. At this time, the upper steel pipe pile is set to a rotation phase in which the upper rotation transmission member of the joint pipe and the lower rotation transmission member of the lower steel pipe pile can be engaged with each other. In this state, when the upper steel pipe pile is rotated by the pile driving machine, the lower steel pipe pile is rotated by the engagement between the upper rotation transmission member and the lower rotation transmission member of the joint pipe integrally fixed to the upper steel pipe pile. It is transmitted and can be piled up by rotation and press-fitting. Even if the tip blade is not necessarily provided, it is possible to penetrate the pile into the ground by rotation and press fit. However, if the steel pipe pile at the lower end has the tip blade, the tip blade will bite into the ground and rotate. Therefore, it becomes possible to press-fit more efficiently and to harder ground. Since the upper rotation transmission member and the lower rotation transmission member can be engaged in the forward and reverse directions in the circumferential direction of the steel pipe pile, when the upper steel pipe pile is reversely rotated by the pile driving machine, the tip blades at the lower end of the pile are rotated reversely. The steel pipe pile is lifted and the steel pipe pile can be pulled out. In this way, the steel pipe pile can be rotated, press-fitted and rotated. When the tip blade is not provided, the steel pipe pile can be pulled out simply by applying a pulling force.

  According to the joint structure of this configuration, connection at the site can be performed without performing on-site welding as described above, and mechanical connection can be achieved by a simple operation. Moreover, the joint pipe only needs to be provided on the upper steel pipe pile side, and is not necessary for the lower steel pipe pile. In addition to the joint pipe, it is only necessary to provide an upper rotation transmission member and a lower rotation transmission member capable of transmitting rotations in the forward and reverse directions. The joint pipe may also have a simple shape, for example, a steel pipe simply cut. For these reasons, the structure is simplified compared to a conventional joint structure in which an annular joint material is provided on upper and lower steel pipe piles. Further, it is only necessary to fit and fix the joint pipe to the upper steel pipe pile, and it is only necessary to fix the lower rotation transmission member to the lower steel pipe pile. Therefore, the processing of the steel pipe pile itself is very small. The joint pipe is fixed to the upper steel pipe pile by welding or the like, but since factory welding can be performed, welding work is easy and welding quality can be ensured, unlike on-site welding.

  In this invention, the upper rotation transmission member has a pair of engagement material portions arranged in the circumferential direction of the steel pipe pile, and the lower rotation transmission member is between the pair of engagement material portions of the upper rotation transmission member. It is good also as what enters into an up-down direction. By having a pair of engaging members arranged in the circumferential direction of the steel pipe pile, rotation transmission in both forward and reverse directions can be performed with a simple structure. The rotation transmission member having a pair of engaging members is somewhat complicated in shape compared to the other rotation transmission member, but in order to fix to the joint pipe, unlike the case of fixing to a long steel pipe pile, Fixing work is easy.

  The joint structure of the rotary press-fit type steel pipe pile according to the present invention is a connection type rotary press-fit type steel pipe pile that is joined with a steel pipe pile made up of circular steel pipes one after the other and rotated against the ground. The joint structure is connected to each other, and of the upper steel pipe pile and the lower steel pipe pile connected to each other, the upper end is fitted and fixed to the outer periphery of the lower end of the upper steel pipe pile, and the lower part is the upper end of the lower steel pipe pile. A joint pipe that covers the outer periphery of the joint pipe, an upper rotation transmission member that is fixed to a part of the outer periphery of the joint pipe and extends below the lower end of the joint pipe, and a non-steering pipe with respect to the joint pipe. A lower rotation transmission member that is fixed to a part of the outer periphery in the vicinity of the upper end of the covering portion and can be engaged with the upper rotation transmission member in the forward and reverse directions of the steel pipe pile circumferential direction. Although it is possible, it does not require field welding and is simple Working with be mechanically connected, also configurations simpler, effect that the processing of the steel pipe pile itself requires little.

It is a fracture | rupture front which shows the placement process of the rotary press-fit type steel pipe pile to which the joint structure which concerns on 1st Embodiment of this invention is applied. It is an enlarged front view which shows the attachment of the pile driver and the upper end of a steel pipe pile. (A) is a vertical sectional view of the joint structure of the same rotary press-fit type steel pipe pile, and (B) is a sectional view taken along the line III-III in FIG. It is a front view of the joint structure of the same rotation press-fit type steel pipe pile. (A) is a sectional view and a bottom view showing an upper steel pipe pile, a joint pipe, and an upper rotation transmission member in the joint structure of the same rotary press-fit type steel pipe pile, and (B) is a lower side in the joint structure of the same rotary press-fit type steel pipe pile. It is sectional drawing and a top view which show a steel pipe pile and a lower side rotation transmission member.

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, this rotary press-fit type steel pipe pile has a joint structure in which a plurality of steel pipe piles 1 each made of a circular steel pipe are successively joined up and down, and the lower end of the steel pipe pile 11 is conical at the tip 1a. In the connection-type rotary press-fit steel pipe pile 10 that is press-fitted while rotating with respect to the ground G, the joint structure that connects the upper and lower steel pipe piles 1 to each other has the spiral tip blade 2. The outer diameter of the tip blade 2 is larger than the outer diameter of the steel pipe pile 1, and the steel pipe pile 1 can be lifted by rotating it reversely in a state of biting into the ground.

  In the pile driving machine 20, for example, a prop 22 is provided in a travelable pile driving machine main body 21, and an attachment that holds the upper end of the rotary press-fit type steel pipe pile 10 on an elevating body 23 that can be moved up and down along the post 22. What provided the pile head holding tool 24 which becomes is used. The column 22 rotates the pile head gripping tool 24 with respect to the lifting body 23 and a lifting drive source 25 such as a hydraulic cylinder that applies pressure and pulling force to the rotary press-fit steel pipe pile 10 by moving the lifting body 23 up and down. And a rotary drive source (not shown) such as a hydraulic motor or an electric motor that rotates the rotary press-fit steel pipe pile 10. The rotational drive source can switch the rotational direction in the forward and reverse directions.

  As shown in FIG. 2, for example, the pile head gripping tool 24 of the pile driving machine 20 includes a cylindrical pile head fitting portion 24 a that opens downward to fit the head of the steel pipe pile 1, and this pile head fitting. A lifting / lowering body coupling portion 24b that extends above the portion 24a and is coupled to the lifting / lowering body 23 (FIG. 1) so that the rotation of the rotational drive source can be transmitted. The pile head fitting portion 24 a is provided with an engagement recess 24 c that engages with a protrusion 5 A provided to protrude from the outer peripheral surface of the head of the steel pipe pile 1 and transmits the rotation to the steel pipe pile 1.

  As shown in FIGS. 3 to 5, this joint structure includes a joint pipe 3, an upper rotation transmission member 4, and a lower rotation transmission member 5, and a fall prevention tool 6 is provided as necessary.

  Of the upper steel pipe pile 1A and the lower steel pipe pile 1B that are connected to each other, the joint pipe 3 is fitted at the upper end of the lower end of the upper steel pipe pile 1A and fixed at the welded portion 7, and the lower portion is the lower steel pipe pile. Cover the outer periphery of the upper end of the pile 1B. The joint pipe 3 is put on the lower steel pipe pile 1B to the position where the upper end face of the lower steel pipe pile 1B comes into contact with the lower end face of the upper steel pipe pile 1A. In this example, the length of the joint pipe 3 is slightly longer than the outer diameter of the joint pipe 3. The joint pipe 3 may be thicker or thinner than the steel pipe pile 1, but in this example, for example, the joint pipe 3 is made of a steel pipe having the same material and thickness as the steel pipe pile 1, and the inner diameter of the steel pipe pile 1 is the same. The diameter is set to be larger than the fitting gap so that the outer diameter can be inserted and removed. The welded portion 7 is fillet welded to the upper end surface of the joint pipe 3 and the outer peripheral surface of the upper steel pipe pile 1A, and is continuously provided on the entire periphery.

  The upper rotation transmission member 4 is provided so as to be fixed to a part of the outer periphery of the lower part of the joint pipe 3 and to extend below the lower end of the joint pipe 3. The lower rotation transmission member 5 is fixed to a part of the outer periphery in the vicinity of the upper end of the uncovered portion of the lower steel pipe pile 1B with respect to the joint pipe 3, and is engaged with the upper rotation transmission member 4 in the forward and reverse directions in the circumferential direction of the steel pipe pile. Is possible.

  Specifically, the upper rotation transmission member 4 includes a pair of engaging material portions 4a and 4a arranged in the circumferential direction of the steel pipe pile and a reinforcing member 4c. Each engagement material part 4a, 4a consists of a square-bar-shaped steel material etc., and it is extended and provided in the up-down direction so that it may open and be parallel to the insertion gap d mutually. Each engaging material part 4a, 4a makes the lower part protrude below from the lower end of the joint pipe 3. Each engaging material part 4a, 4a is fixed to the joint pipe 3 by welding the part along the outer peripheral surface of the joint pipe 3 in both side surfaces to the joint pipe 3 by the weld part 8 such as fillet welding. The reinforcing member 4c is a member that reinforces the engaging material portions 4a and 4a on both sides by joining each other, and both side edges are overlapped on the front of the engaging material portions 4a and 4a on both sides, and welding such as fillet welding is performed. The portion 9 is fixed to each engaging member 4a, 4a by welding. The reinforcing member 4c is provided from a portion where the engaging member portion 4a protrudes downward with respect to the joint pipe 3 to a non-projecting portion. The insertion gap d between the engaging member portions 4a and 4a is a gap into which the lower rotation transmission member 5 is inserted.

The lower rotation transmission member 5 is a member that enters in the vertical direction between the pair of engaging member portions 4 a and 4 a of the upper rotation transmission member 4. The lower rotation transmission member 5 is made of a square bar-like steel material or the like, and both side edges are fixed to the outer peripheral surface of the lower steel pipe pile 1B by welded portions 10 such as fillet welds. The upper end position of the lower rotation transmission member 5 is in a state where the joint pipe 3 is covered until the lower end face of the upper steel pipe pile 1A comes into contact with the upper end face of the lower steel pipe pile 1B, with respect to the lower end face of the joint pipe 3 The position is such that a slight gap that is non-contact occurs. The lower end position of the lower rotation transmission member 5 extends downward from the lower end of the upper rotation transmission member 4 in the illustrated example.
The lower rotation transmission member 5 can be engaged with an engagement recess 24c (FIG. 2) of a pile head gripping tool 24 that is an attachment of the pile driving machine 20 of FIG. When the pile head gripping tool 24 is a dedicated attachment, the engaging recess 24c of the pile head gripping tool 24 is manufactured to engage with the lower rotation transmission member 5 and transmit the rotation.

  In FIG. 3, the fall prevention tool 6 is a pin-shaped member that is inserted between holes 12 and 13 provided in alignment with each other on the pipe wall of the joint pipe 3 and the lower steel pipe pile 1B. In the illustrated example, the fall prevention tool 6 is a bolt, and is screwed into a nut 14 fixed to the outer peripheral surface of the joint pipe 3 by welding and inserted between the holes 12 and 13.

Next, the pile driving work will be described. The steel pipe pile 11 at the lower end of FIG. 1 is prepared as if a lower rotation transmission member 5 was provided. Each of the other steel pipe piles 1 is prepared in a state where the joint pipe 3 is fixed to the lower end and the lower rotation transmission member 5 is provided near the upper end. Each steel pipe pile 3 to be connected is sequentially press-fitted into the ground while being rotated by the pile driving machine 20. At this time, when the lower steel pipe pile 1B is press-fitted into the ground to a height suitable for connection work, the joint pipe 3 at the lower end of the upper steel pipe pile 1A is put on the upper end of the lower steel pipe pile 1B. The joint pipe 3 is carried out until the lower end surface of the upper steel pipe pile 1A comes into contact with the upper end face of the lower steel pipe pile 1B. The operation of covering the joint pipe 3 is performed in a state in which the rotation phases of the upper and lower rotation transmission members 4 and 5 coincide with each other, and the lower rotation transmission member 5 is placed between the pair of engagement material portions 4a and 4a of the upper rotation transmission member 4. Insert into. Thereby, upper and lower steel pipe piles 1A and 1B will be in a connection state.
At this time, if necessary, the fall prevention device 6 is screwed into the welding nut 14 of the joint pipe 3, and the holes 12, 13 provided in alignment with each other on the pipe wall of the joint pipe 3 and the lower steel pipe pile 1B. Insert them in between.

  The upper end of the upper steel pipe pile 1A thus connected is inserted into the pile head gripping tool 24 of the pile driving machine 20, and the lower rotation transmission member 5 of the upper end of the upper steel pipe pile 1A is engaged with the engaging recess 24c of the pile head gripping tool 24. The upper steel pipe pile 1 </ b> A can be rotated and press-fitted by the pile driving machine 20. When the upper steel pipe pile 1A is rotated, the rotation is transmitted to the lower steel pipe pile 1B by the engagement of the upper rotation transmission member 4 and the lower rotation transmission member 5 of the joint pipe 3 integrally fixed to the upper steel pipe pile 1A. The pile driving by the screwing of the tip blade 2 of the steel pipe pile 11 at the lower end (FIG. 1) can be performed. Since the upper rotation transmission member 4 and the lower rotation transmission member 5 can be engaged with each other in the steel pipe pile circumferential direction, when the upper steel pipe pile 1A is rotated reversely by the pile driving machine 20, the ground at the lower end of the pile is formed. The steel pipe pile 1 is lifted by the reverse rotation of the biting tip blade 2, and the steel pipe pile 1 can be pulled out. In this way, the steel pipe pile 1 can be rotated, press-fitted and rotated.

  According to the joint structure having the above-described configuration, connection at the site can be performed without performing on-site welding, and mechanical connection can be achieved by a simple operation. Moreover, the joint pipe 3 need only be provided on the upper steel pipe pile side 1A, and is not required for the lower steel pipe pile 1B. In addition to the joint pipe 3, it is only necessary to provide an upper rotation transmission member 4 and a lower rotation transmission member 5 capable of transmitting rotations in the forward and reverse directions. The joint pipe 3 may also have a simple shape, and may simply be a cut steel pipe. For these reasons, the structure is simplified compared to a conventional joint structure in which an annular joint material is provided on upper and lower steel pipe piles. Further, it is only necessary to fit and fix the joint pipe 3 to the upper steel pipe pile 1A, and it is only necessary to fix the lower rotation transmission member 5 to the lower steel pipe pile 1B. Therefore, the processing of the steel pipe pile 1 itself is very small. The joint pipe 3 and the upper and lower rotation transmission members 4 and 5 are fixed by welding or the like. However, since the welding can be performed by factory welding, the welding operation is simple and the welding quality can be ensured, unlike the field welding.

  In addition, since the pair of engaging members 4a are arranged in the circumferential direction of the steel pipe pile, rotation transmission in both forward and reverse directions can be performed with a simple structure. The rotation transmission member 4 having a pair of engaging members 4a is somewhat complicated in shape as compared to the other rotation transmission member 5, but is fixed to the long steel pipe pile 1 for fixing to the joint pipe 3. Unlike the case, the fixing work is easy.

  The fall prevention device 6 does not necessarily have to be provided. However, if the fall prevention device 6 is provided, the upper steel pipe pile 1A and the lower steel pipe pile 1B are unexpectedly separated in the ground, and rotation transmission becomes impossible. Is avoided. Therefore, it is preferable to provide the fall prevention tool 6 in order to ensure work.

In the above embodiment, the upper rotation transmission member 4 is provided with a pair of engagement material portions 4a, and the lower rotation transmission member 5 is inserted between the pair of engagement material portions 4a. However, the lower rotation transmission member 5 may have a pair of engaging members, and the upper rotation transmission member 4 may be formed of one member. Further, the upper rotation transmission member 4 and the lower rotation transmission member 5 may be of any shape as long as they can transmit forward and reverse rotations and can be inserted into and removed from each other in the axial direction of the steel pipe pile. I can do it. The number of sets of the upper and lower rotation transmission members 4, 5 may be a plurality arranged in the circumferential direction of the steel pipe pile 1. The joint pipe 3 is not limited to a steel pipe but may be a metal pipe such as cast steel.
Moreover, in the said embodiment, although the steel pipe pile 11 of the lower end has the front-end | tip blade | wing 2 among the steel pipe piles 1 connected successively up and down, the front-end | tip blade | wing 2 does not necessarily need to be. As a result of the construction experiment, it was confirmed that even without the tip blade 2, pile driving by rotation and press-fitting can be performed on a somewhat hard ground. Even when there is no tip blade 2, the tip 1a of the steel pipe pile 11 at the lower end is preferably conical.

DESCRIPTION OF SYMBOLS 1 ... Steel pipe pile 1A ... Upper steel pipe pile 1B ... Lower steel pipe pile 2 ... Tip blade 3 ... Joint pipe 4 ... Upper rotation transmission member 4a ... Engagement material part 5 ... Lower rotation transmission member 6 ... Fall prevention tool 10 ... Rotation Press-fit steel pipe pile 20 ... Pile driver

Claims (3)

In a connection type rotary press-fit type steel pipe pile that presses the steel pipe piles made of circular steel pipes one after the other in turn and presses against the ground, the joint structure connects the upper and lower steel pipe piles to each other,
Of the upper steel pipe pile and the lower steel pipe pile that are connected to each other, a joint pipe whose upper end is fitted and fixed to the outer periphery of the lower end of the upper steel pipe pile and the lower part is fitted to the upper outer periphery of the lower steel pipe pile; An upper rotation transmission member fixed to a part of the outer periphery of the joint pipe and extending below the lower end of the joint pipe, and a part of the outer periphery near the upper end of the non-covered portion of the lower steel pipe pile with respect to the joint pipe A rotary press-fit type steel pipe pile joint structure comprising: a lower rotation transmission member that is fixed to the upper rotation transmission member and is engageable with the upper rotation transmission member in the forward and reverse directions of the steel pipe pile circumferential direction.   The joint structure of the rotary press-fit type steel pipe pile according to claim 1, wherein the steel pipe pile at the lower end among the steel pipe piles successively connected to the upper and lower sides has a spiral tip blade. 3. The upper rotation transmission member according to claim 1, wherein the upper rotation transmission member has a pair of engaging members arranged in a circumferential direction of the steel pipe pile, and the lower rotation transmission member is the pair of upper rotation transmission members. A joint structure of a rotary press-fit type steel pipe pile that enters in the vertical direction between the engaging material parts.

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