JP2006241919A - Pile construction machine and pile construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile construction machine and a pile construction method minimizing removed soil in digging a pile hole by providing an excavating device capable of easily attaching/detaching an excavating tool to/from the tip of a steel pipe or a casing tube. <P>SOLUTION: The pile construction machine has the steel pipe or casing tube 2; a tubing device 1 gripping it by a chuck mechanism and transmitting rotational force of a driving motor to rotate the steel pipe or casing tube and and to push it into the ground by the driving force of a lifting cylinder; and the excavating device 5 equipped with the excavating tool for excavating the ground and a grip mechanism for pressing a plurality of grip members provided at equal spaces on a cylindrical internal wall, wherein the excavating tool is mounted into the steel pipe or casing tube 2 by the grip mechanism to close a lower end opening. Soil excavated by the excavating tool of the excavating device is pushed away to the outside of the steel pipe or casing tube 2 to excavate forward, and after excavating down to a predetermined depth, the excavating device is detached from the steel pipe or casing tube and taken out. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  For example, when constructing a foundation pile for supporting a structure on soft ground, the present invention excavates a pile hole of a cast-in-place pile where a steel reinforced cage is built and concrete is placed using a steel pipe or a casing tube. More particularly, the present invention relates to a pile construction machine and a pile construction method that reduce soil removal as much as possible when digging a pile hole.

  When digging a pile hole to install a foundation pile into the ground, the conventional method has discharged the earth and sand excavated with an auger or the like to the ground. However, the excavated excavated soil must be disposed of as industrial waste, and the excavated soil has been required to be disposed of as well as labor for the disposal. Then, the construction which dug a pile hole without excavation has been proposed conventionally, and the following patent documents 1 are indicated as one proposal which excavated the ground using a casing tube. . This Patent Document 1 describes a cast-in-place pile construction machine that expands and consolidates soil while advancing with an auger head attached to the lower end of a casing tube.

  In the cast-in-place pile construction machine disclosed in Patent Document 1, an auger head in which a spiral screw blade is formed in a spiral shape is attached to the lower end of the casing tube, and the casing tube is rotated by a rotary drive device at the upper end. Then, the auger head screw wings screw into the soil, leading downward propulsion, the conical auger head base is squeezed into the soil by this propulsive force and the weight of the device, and the soil is expanded and consolidated. While digging, proceed. Therefore, the casing tube enters vertically into the soil. Then, the auger head and the casing tube enter the soil, and this operation is performed completely without soil.

Then, the casing tube is reversed and the casing tube is lifted by the crane device. Then, cement mortar is injected into the expanded pile hole, the casing tube is lifted, and then the cement mortar is solidified by inserting a reinforcing bar into the cement mortar in the expanded hole, so-called cast-in-place piles are configured Is done.
Japanese Examined Patent Publication No. 7-11233 (page 3-4, FIGS. 1 and 2) Utility Model Registration No. 2586039

  However, Patent Document 1 describes that a pile hole is dug at once with a casing tube to which an auger head is attached. However, since the excavated soil is pushed away as it is, the excavation resistance increases, and rotation is output. Depending on the torque of the rotary drive device, if digging to a certain extent, the excavation resistance is large, and it becomes impossible to dig without excavating soil. In particular, when building foundation piles, it is necessary to dig a pile hole to a hard support layer that passes through a soft ground area and further down to improve stability. Therefore, since the excavation resistance is small in the soft layer, the excavation can be continued even without draining, but the resistance is large in the support layer, so that the excavation cannot be continued without excavating soil. Moreover, even if it is a soft layer, if the depth of a hole becomes deep, resistance will become large, and even if it does not reach a support layer, it becomes impossible to dig without excavating soil. In addition, when there is an intermediate layer having a large resistance at a position shallower than the support layer, the intermediate layer cannot be dug without soil.

  Therefore, in order to solve the problem, the present invention is provided with a drilling device that can easily attach and detach a drilling tool at the tip of a steel pipe or a casing tube, and a pile construction machine and a pile that reduce soil removal as much as possible to dig a pile hole The purpose is to provide a construction method.

  The pile construction machine of the present invention grips the steel pipe or casing tube and the steel pipe or casing tube by a chuck mechanism, transmits the rotational force of the drive motor to rotate the steel pipe or casing tube, and rotates by the driving force of the lifting cylinder. A tubing device for pushing the steel tube or casing tube into the ground, a drilling tool for excavating the ground, and a grip mechanism for pressing a plurality of grip members provided on the cylindrical inner wall, the drilling tool closing the lower end opening In this way, the steel pipe or casing tube has a drilling device mounted by a grip mechanism, and the soil excavated by the drilling tool of the drilling device is pushed out to the outside of the steel pipe or casing tube, and is fixed. After drilling to a depth of Removed from over single tube, characterized in that is obtained by the retrieval.

In the pile construction machine according to the present invention, the grip mechanism of the excavator is connected via a link in which the grip member is arranged in the radial direction, and the link is moved in the radial direction by moving the link up and down on the center side. It is what was made to do.
In the pile construction machine according to the present invention, the grip mechanism of the excavator moves the wedge-shaped chuck block up and down by a cylinder, and the grip member slides on the tapered surface of the chuck block and moves in the radial direction. It is characterized by that.
In the pile construction machine according to the present invention, the excavator is configured such that the excavator is attached to the lower side of the grip member via a cylinder, and the vertical position of the excavator is adjusted by expansion and contraction of the cylinder. It is characterized by being.

The pile construction machine according to the present invention is characterized in that the excavator has propulsion blades that are storably attached to a body provided with an excavating blade.
In the pile construction machine of the present invention, the excavator can be switched between an expanded state and a retracted state by swinging the propelled blade attached to the shaft by expansion and contraction of a cylinder provided in the body. It is characterized by that.
Furthermore, the pile construction machine of the present invention is characterized in that the excavator has an outer diameter larger than a diameter of a steel pipe or a casing tube when the propulsion blade is expanded.

  On the other hand, the pile construction method of the present invention comprises a drilling tool, a drilling device that can be attached to and detached from the cylindrical body by a grip mechanism is mounted so as to rotate integrally with a lower end portion of a steel pipe or a casing tube, and a tubing device is A method of digging a pile hole by grasping and rotating a steel pipe or casing tube provided with the excavating device, wherein the soil excavated by the excavating tool of the excavating device is placed outside the steel pipe or casing tube. When digging in the soilless state without pushing away, the excavation resistance increases, and it is no longer possible to dig forward without soiling, the drilling device is removed from the steel pipe or casing tube, and the steel pipe or casing tube is brought to a predetermined depth. Rotating and press-fitting into the ground, the earth and sand in the steel pipe or casing tube by a bucket It is characterized in that so as to soil.

Further, the pile construction method of the present invention is provided with a drilling tool, a drilling device that can be attached to and detached from the cylindrical body by a grip mechanism is mounted so as to rotate integrally with a lower end portion of a steel pipe or a casing tube, A method of digging a pile hole by grasping and rotating a steel pipe or casing tube provided with the excavating device, wherein the soil excavated by the excavating tool of the excavating device is placed outside the steel pipe or casing tube. If the drilling resistance increases and the excavation resistance increases and it becomes impossible to dig without excavation, the excavator is removed from the steel pipe or casing tube, and then the excavation bucket is removed from the steel pipe or Insert into the casing tube to excavate the ground and discharge the earth and sand stored in the bucket to the ground When excavating with the excavating bucket, or after excavating with the excavating bucket to a certain depth, repeatedly rotating and pressing the steel pipe or casing tube into the ground with the above-mentioned tubing device. It is characterized by press fitting.
Furthermore, the pile construction method of the present invention is characterized in that the earth and sand discharged by the bucket is refilled back into the steel pipe or casing tube.

  Therefore, according to the pile construction machine of the present invention and the pile construction method using the construction machine, the excavator is very easy to attach and detach. Construction can be easily switched to excavation with soil removal. Further, by performing excavation without soil at a certain depth, it becomes possible to reduce the amount of soil drastically and greatly reduce the waste disposal cost that must be treated as industrial waste.

  Next, an embodiment of a pile construction machine and a pile construction method according to the present invention will be described below with reference to the drawings. Here, FIG. 1 is the figure which showed the pile construction method using the pile construction machine of this embodiment. In this embodiment, the tubing device 1 is installed at the construction position of the pile, and the casing tube 2 is inserted vertically into the tubing device 1. The tubing device 1 is provided with a chuck member for gripping the casing tube 2, and has a drive motor that rotates the casing tube 2 gripped via the chuck member and a lifting cylinder that is press-fitted into the ground.

  The casing tube 2 gripped by the tubing device 1 has a digging blade 3 attached on the circumference of the lower end, and is configured so that it can be rotationally pressed while excavating the ground. And the pile construction machine of this embodiment is excavation attached to the lower end part in this tubing device 1 and the casing tube 2 and the casing tube 2 hold | gripped by the tubing device 1, as shown to Fig.1 (a). It is comprised by the apparatus 5. The excavator 5 is configured so that it can be easily attached to and detached from the casing tube 2 and can be removed while the pile hole is dug.

Therefore, the configuration of the excavator 5 to be mounted on the casing tube 2 will be described next. FIG. 3 is a view showing the excavator 5 located at the lower end portion of the casing tube 2 as shown in FIG. 1 (a), showing the non-attached state on the right half and the attached state on the left half. Yes.
The excavator 5 includes a shaft 11 connected to a crane rope via a swivel joint (not shown), a tubular member 12 into which the shaft 11 is slidably inserted in the vertical direction, and a lower end flange 13 of the tubular member 12. The drill 15 is an excavating tool that is detachably attached to the casing, and three grip members 16 that are arranged at equal intervals in the circumferential direction and pressed against the inner wall of the casing tube 2.

  The shaft 11 has a weight 22 mounted on the upper flange 17, and a spring 21 is contracted between the shaft 11 and the shaft 11. The upper flange 17 of the shaft 11 and each grip member 16 are connected by a downward link 18 inclined downward from the center of the casing tube 2 toward the outside. The cylinder member 12 and each grip member 16 are connected by a pair of upper and lower links 19 and 20 that are inclined upward from the center of the casing tube 2 toward the outside. In the excavator 5, the attachment / detachment mechanism for transmitting the rotational force and propulsive force of the casing tube 2 to the drill 15 is mainly arranged at equal intervals in the circumferential direction of the shaft 11, the cylindrical member 12, and the casing tube 2. It is composed of three grip members 16, links 18, 19, and 20 that connect the grip members 16, the shaft 11, and the cylindrical member 12. The links 18, 19, and 20 are configured in a compact and simple manner, and are disposed in the casing tube 2.

  In such a drilling device 5, in the suspended state, the cylindrical member 12 descends while compressing the spring 21 by the weight of the drill 15 (the state on the right side in FIG. 3), and the inclination of the downward link 18 and the upward links 19, 20. Becomes larger. Therefore, the grip member 16 is positioned in the center direction of the casing tube 2, and the outer diameter thereof is smaller than the inner diameter of the casing tube 2, so that the inside of the casing tube 2 can be easily moved. Therefore, the excavator 5 is inserted while being suspended in the casing tube 2 gripped by the tubing device 1, and is mounted at a position where the tip of the drill 15 at the lower end touches the ground.

  In the excavator 5, the drill 15 and the cylindrical member 12 are pushed downward by the weight of the weight 22 on which the shaft 11 is mounted and the urging force of the spring 21. Therefore, the shaft 11 enters deeply into the cylindrical member 12, the downward link 18 and the upward links 19 and 20 fall as shown on the left side of the drawing, the grip member 16 spreads outward and is pressed against the inner wall of the casing tube 2, and the excavator 5 is attached by gripping the casing tube 2 from the inside. In the pile construction machine of the present embodiment, the drill 15 closes the lower end opening of the casing tube 2 with the excavating device 5 attached, and can be pushed out of the casing tube 2 without putting the excavated soil inside. ing.

  In the pile construction machine in which the excavator 5 is mounted on the casing tube 2 in this manner, cast-in-place piles are constructed as follows. First, the casing tube 2 gripped by the tubing device 1 is lowered while rotating. That is, in the tubing device 1, the chuck member holds the casing tube 2, the rotation of the drive motor is transmitted to the rotating body integrally provided with the chuck member, and the rotating body is further lowered by the lifting cylinder. As a result, the casing tube 2 descends by one stroke while rotating on the ground. Therefore, in the tubing device 1, the press-fitting with rotation is repeated every one stroke of the lifting cylinder, and the ground is dug as shown in FIG.

  At this time, in the excavator 5, the rotation of the casing tube 2 is transmitted to the drill 15 via the grip member 16. Accordingly, the drill 15 rotates at the tip of the casing tube 2. When the casing tube 2 is rotated and pressed into the ground by the tubing device 1, an upward force acting on the drill 15 and the cylindrical member 12 is increased by a reaction force from the ground. Therefore, the upward links 19 and 20 become more horizontal as shown on the left side of FIG. 3, and the grip member 16 is strongly pressed by the casing tube 2 to increase the grip force. In this way, a grip force commensurate with the excavation resistance is obtained, and the rotational force and propulsive force of the casing tube 2 are reliably transmitted to the drill 15.

  When placing foundation piles, the ground must pass through the soft ground area and reach the support layer of the hard ground below it. For example, when the ground of the construction site is as shown in FIG. 1 (a), the surface layer A exists up to a predetermined depth, and there is a support layer B indicated by a two-dot chain line below it, in this embodiment, this surface layer A portion is The goal is to excavate without soil. However, since it depends on the output torque of the tubing device 1, when excavation without soil excavation is performed as much as possible and the excavation resistance increases and the casing tube 2 is further pushed down, the excavation is impossible. As shown in (b), the excavator 5 at the lower end of the casing tube 2 is removed and switched to the rotary press-fitting only of the casing tube 2.

  In order to remove the excavator 5 from the casing tube 2, the excavator 5 is pulled up by a rope (not shown) connected to the connecting hook 23. Then, in the excavator 5, the shaft 11 is pulled up as shown on the right side of FIG. 3, and the spring 21 is compressed by the load of the drill 15 and the cylindrical member 12. Therefore, the drill 15 and the cylindrical member 12 are relatively lowered with respect to the shaft 11, and the shaft 11 moves in a direction of coming out of the cylindrical member 12. The shaft 11 is raised and the inclination of the downward link 18 is increased, and the grip member 16 connected to the downward link 18 is pulled up. Accordingly, the inclination of the upward links 19 and 20 that connect the grip member 16 and the cylindrical member 12 also increases. As a result, the grip member 16 moves in the center direction of the casing tube 2 and moves away from the inner wall, and the excavator 5 is easily pulled out of the casing tube 2.

  Subsequently, the casing tube 2 is lowered while being rotated from the tubing device 1, and is rotationally press-fitted into the ground by the excavating blade 3 at the lower end. At that time, as shown in FIG. 1B, since the earth and sand are contained in the casing tube 2 that is rotationally press-fitted into the support layer B, the excavation bucket 50 is dropped into the casing tube 2, and the support layer B The earth and sand are removed. Then, the pile hole is dug to a predetermined depth by rotational press-fitting of the casing tube 2 and soil removal in the casing tube 2 by the excavating bucket 50. Some piles may be cast-in-place concrete expanded bottom piles that expand the pile tip with a widened bucket and increase the bearing capacity.

  When the pile hole is dug, a reinforcing bar 200 is built in the pile hole, as shown in FIG. Thereafter, the casing tube 2 is extracted by the tubing device 1 while pouring the concrete 100 into the pile hole. That is, the lifting cylinder is extended and pulled up while rotating the gripped casing tube 2 in the reverse direction. And as shown in FIG.1 (d), what is called a cast-in-place pile is built.

  Here, FIG. 2 is a graph showing the N value with respect to the depth of the ground. The N value indicates that the larger the value is, the stronger the ground is at the location, and the smaller the value is, the softer the ground at the location is. Such a value can be confirmed by a drilling survey or the like performed in advance. In the construction site where the results shown in this graph are shown, the N value suddenly increases in the vicinity of 20 m, and has changed in a range not exceeding 20 until reaching that point. Therefore, at this site, excavation without soil is performed up to a depth Y where the N value of the ground is 20 or less, for example. In addition, by measuring N value beforehand in this way, the tubing apparatus 1 of the capability according to it can be selected.

As described above, in the pile construction machine according to the present embodiment, the excavator 5 is very easy to attach and detach. It is now possible to easily switch to excavation with soil. For this reason, this pile construction machine and the construction method using this pile construction machine can significantly reduce the amount of soil discharged, which greatly reduces the residual soil treatment cost that must be treated as industrial waste.
In addition, the work efficiency was improved by improving the workability by reducing the earth removal work on the surface layer A.
Also, in the surface layer A, the earth and sand excavated by the drill 15 of the excavating device 5 is pushed away to the outside of the casing tube 2 and pressed against the inner peripheral surface of the pile hole, so that the strength of the wall of the pile hole is increased to prevent collapse. As a result, the reliability of pile accuracy was increased.

As mentioned above, although the construction method by the casing tube 2 has been demonstrated, when using a steel pipe instead of the casing tube 2, the following construction methods are also considered. 8 to 10 are diagrams showing different construction methods. In addition, the excavator 5 etc. are simplified and shown conceptually.
First, in any construction method, as shown in FIGS. 8 to 10 (a) and (b), as in the case of the casing tube 2, the steel pipe 9 is rotated by the tubing device 1 with the excavator 5 attached to the tip. Press-fitted and excavated without excavation. And when excavation resistance becomes large and it becomes impossible to dig without excavation, the excavator 5 is taken out from the steel pipe and switched to excavation by the excavation bucket 60 as shown in FIGS. It is done.

  Although not shown, after the steel pipe 9 is pressed into the support layer while discharging excavated earth and sand, the excavation bucket 60 can be taken out of the steel pipe 9 to form a steel pipe pile. Alternatively, after the steel pipe 9 is pressed into the support layer while discharging the soil, the excavation bucket 60 is taken out of the steel pipe 9 and a reinforcing bar is inserted to place concrete, thereby forming a steel pipe concrete pile.

  On the other hand, as shown in FIG. 8 (d), after the steel pipe 9 is press-fitted to a predetermined depth while discharging, the lower part of the pile is cast into the cast-in-place concrete pile 110 by continuously excavating to the support layer with the excavation bucket 60. It can be set as the composite pile which made the pile upper part the steel pipe pile 120. FIG. At that time, as shown in the figure, the pile tip can be expanded by a bottom expansion bucket to form a steel pipe concrete bottom expansion pile. In the case of such synthetic piles, if the strength of the joint between the steel pipe part and the cast-in-place pile part can be obtained using a sufficiently strong steel pipe, the steel pipe part is hollow but has sufficient strength as a whole pile It will be.

In addition, as shown in FIG. 9 (e), the excavated soil generated when the lower part of the steel pipe part and the cast-in-place pile part are excavated in the hollow part of the steel pipe 9 is completely drained so that no residual soil is generated. Construction is also possible.
Furthermore, as shown in FIG. 10 (d), by placing concrete 100 on the steel pipe 9 at the upper part of the pile, or by placing the reinforcing bar 200 and placing the concrete, the lower part of the pile is cast in place with concrete and pile. The upper part can be steel pipe concrete or steel pipe reinforced concrete. Also in this case, the bottom end of the pile can be expanded to form an expanded pile.
As described above, the optimum construction method can be selected from various embodiments according to the construction situation and the economic situation.

  Next, the other plan of the excavator which comprises a pile construction machine is demonstrated. 4 and 5 are views showing a lower end portion of the casing tube. In the excavator 6 inserted into the casing tube 2, an upper frame 31 and a chuck frame 32 are connected by a chuck cylinder 33. The upper frame 31 and the chuck frame 32 have a ring shape according to the size of the casing tube 2, and four chuck cylinders 33 are arranged at equal intervals along the circumference thereof. The chuck frame 32 is similarly provided with four wedge-shaped chuck members 34 at equal intervals, and a grip member 35 is provided so as to be pushed outward by the chuck members 34. The excavator 6 has a lower excavating blade 36 and a screw 37 above the excavating blade 36, and the excavator is configured to expand and contract by a cylinder 38 provided at the center.

  In such excavation device 6, as shown in FIG. 4, gripping is performed in a state in which the excavation device 6 is inserted into the casing tube 2 and is hooked and hung by the bracket 39 at the upper end. The chuck cylinder 33 is extended to lower the chuck frame 32, and the chuck member 34 suspended from the chuck frame 32 is pushed down. Accordingly, the grip member 35 is pushed out from the inside by the tapered surface of the chuck member 34 and is pressed against the inner surface of the casing tube 2. Therefore, the excavator 6 can rotate integrally with the casing tube 2, and excavation with no soil is performed in the same manner as the excavator 5 described above.

At that time, the amount of the screw 37 coming out of the casing tube 2 can be adjusted by expanding and contracting the center cylinder 38, and the shape of the tip can be changed according to the characteristics of the ground. it can.
In the pile construction machine equipped with the excavator 6, the excavation blade 36 closes the lower end opening of the casing tube 2, and the flange 40 at the end of the screw 37 is also connected to the lower end opening of the casing tube 2 when the cylinder 38 is extended. Therefore, the excavated soil can be pushed out to the outside without entering the inside and excavated without excavation.

  Next, the other plan of the excavator which comprises a pile construction machine is demonstrated. 6 and 7 are views showing a lower end portion of the casing tube. The excavator 7 inserted into the casing tube 2 has a chuck mechanism similar to that of the excavator 6 and is mounted in the casing tube 2. That is, the upper frame 31 and the chuck frame 32 are connected by the chuck cylinder 33. The upper frame 31 and the chuck frame 32 have a ring shape in accordance with the size of the casing tube 2, and four chuck cylinders 33 are arranged at equal intervals along the circumference thereof. In the same manner, the chuck frame 32 is provided with four wedge-shaped chuck members 34 at equal intervals, and a grip member 35 is provided so as to be pushed outward by the chuck members 34.

  The excavator 7 has a rocket-shaped excavator, and an excavating blade 41 is provided near the pointed tip, and a propelling blade 42 that can be inserted and removed is formed above the excavating blade 41. The propulsion blade 42 is pivotally mounted inside the body 43 of the excavator, and a cylinder 45 is provided in the body as a driving means for swinging the propulsion blade 42. The piston rod of the cylinder 45 and the propulsion blade 42 are connected via a connecting bar 46 that is axially attached.

  In such excavation device 7, as shown in FIG. 6, gripping is performed in a state where the excavation device 7 is inserted into the casing tube 2 and is hooked and hung by the bracket 39 at the upper end. The chuck cylinder 33 is extended to lower the chuck frame 32, and the chuck member 34 suspended from the chuck frame 32 is pushed down. Accordingly, the grip member 35 is pushed out from the inside by the tapered surface of the chuck member 34 and is pressed against the inner surface of the casing tube 2. Therefore, the excavator 7 can rotate integrally with the casing tube 2, and excavation with no soil is performed in the same manner as the excavators 5 and 6 described above.

  That is, the casing tube 2 to which the excavation device 7 is attached is closed at the lower end opening, and excavation without excavation is performed so that the excavated soil can be pushed out of the casing tube 2 without entering the inside. At this time, as shown in FIG. 6, the excavator extends the piston blade of the cylinder 45, the propulsion blade 42 swings through the connecting bar 46, and is spread outward. Therefore, when the casing tube 2 gripped by the tubing device 1 descends while rotating, the propulsion blade 42 of the excavation device 7 at the tip increases the propulsive force in the excavation direction. At the same time, since the propulsion blade 42 has a larger diameter than the casing tube 2, the ground contacting the steel pipe is agitated to reduce the frictional resistance between the steel pipe and the ground, thereby facilitating the press-fitting of the casing tube.

  On the other hand, when the excavation resistance increases and the soilless excavation cannot be performed, the excavator 5 is removed, and the press-fit is switched to the rotary press-fitting only of the casing tube 2. In that case, the casing tube 2 is slightly rotated in the reverse direction to be raised, and in this state, the piston rod of the cylinder 45 is contracted as shown in FIG. As a result, the propulsion blade 42 is swung through the connecting bar 46 and stored in the body 43. In the state where the propulsion blade 42 is expanded, the diameter becomes larger than that of the casing tube 2, but it can be extracted by storing.

  Therefore, even a pile construction machine equipped with the excavator 7 can close the lower end opening of the casing tube 2 and push out the excavated soil to the outside without entering the inside, thereby performing excavation without soil. In particular, since the propulsion blade 42 having a diameter larger than that of the casing tube 2 is provided, the propulsive force in the excavation direction can be increased by the rotational force so that excavation can be performed efficiently. Since the propulsion blade 42 can be retracted, the excavator 7 can be easily removed from the casing tube 2 after excavation without soil.

As mentioned above, although one embodiment was shown and demonstrated about the pile construction machine and pile construction method which concern on this invention, this invention is not limited to this, A various change is possible in the range which does not deviate from the meaning.
For example, the excavator of the excavator 6 shown in FIGS. 4 and 5 may be the drill 15 shown in FIG. In this case, by expanding and contracting the center cylinder 38, the amount of the screw coming out of the casing tube 2 can be adjusted to improve the fluidity of the earth and sand and easily push away.
Further, the grip mechanism of the excavator 5 shown in FIG. 3 may be replaced with that of the excavator shown in FIGS. 5, 6, and 7. Moreover, although the example which used the casing tube is shown in the figure, when using a steel pipe, it becomes the figure which replaced the casing tube with the steel pipe.

It is the figure which showed the pile construction method using the pile construction machine of one Embodiment. It is the figure which showed N value with respect to the depth of a ground with the graph. It is the figure which showed the 1st plan of the excavation apparatus located in a casing tube lower end part, the non-attachment state is shown in the right half, and the attachment state is shown in the left half. It is the figure which showed the 2nd plan of the excavation apparatus located in a casing tube lower end part. It is the figure which showed the 2nd plan of the excavation apparatus located in a casing tube lower end part. It is the figure which showed the 3rd plan of the excavation apparatus located in a casing tube lower end part. It is the figure which showed the 3rd plan of the excavation apparatus located in a casing tube lower end part. It is the figure which showed the other pile construction method using the pile construction machine of embodiment. It is the figure which showed the other pile construction method using the pile construction machine of embodiment. It is the figure which showed the other pile construction method using the pile construction machine of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tubing apparatus 2 Casing tube 3 Excavation blade 5 Excavation apparatus 15 Drill 16 Grip member

Claims (10)

Steel pipe or casing tube,
A tubing device that grips a steel pipe or casing tube with a chuck mechanism, transmits the rotational force of the drive motor to rotate the steel pipe or casing tube, and pushes the steel pipe or casing tube rotated by the driving force of the lifting cylinder into the ground,
An excavator for excavating the ground and a grip mechanism for pressing a plurality of grip members provided on a cylindrical inner wall, and the excavator is mounted in the steel pipe or casing tube by the grip mechanism so as to close the lower end opening. Drilling rigs,
The soil excavated by the excavator of the excavator is pushed out to the outside of the steel pipe or casing tube, and after excavating to a certain depth, the excavator can be removed from the steel pipe or casing tube and taken out. Pile construction machine characterized by that. In the pile construction machine according to claim 1,
The grip mechanism of the excavator is characterized in that the grip member is connected via a link arranged in the radial direction, and the link is moved up and down on the center side to move in the radial direction. Pile construction machine. In the pile construction machine according to claim 1,
The grip mechanism of the excavator is characterized in that a wedge-shaped chuck block is moved up and down by a cylinder so that the grip member moves in a radial direction by sliding on a tapered surface of the chuck block. Pile construction machine. In the pile construction machine according to claim 2 or claim 3,
The pile excavator is characterized in that the excavator is attached to the lower side of the grip member via a cylinder, and the vertical position of the excavator is adjusted by expansion and contraction of the cylinder. In the pile construction machine according to claim 2 or claim 3,
The said excavation apparatus has the propulsion blade attached so that storage was possible with respect to the body provided with the excavation blade, The pile construction machine characterized by the above-mentioned. In the pile construction machine according to claim 5,
The pile is characterized in that the excavator is configured such that the propulsion blade mounted on the shaft swings and switches between an expanded state and a retracted state by expansion and contraction of a cylinder provided in the body. Construction machine. In the pile construction machine according to claim 5 or claim 6,
The pile excavator is characterized in that the outer diameter of the excavator is larger than the diameter of the steel pipe or casing tube when the propulsion blade is expanded. A drilling device having a drilling tool and detachable in a cylindrical body by a grip mechanism is mounted so as to rotate integrally with a lower end portion of a steel pipe or a casing tube, and a tubing device is provided with the drilling device. It is a pile construction method that digs a pile hole by lowering while holding and rotating,
If the soil excavated by the excavator of the excavator is pushed out to the outside of the steel pipe or the casing tube and digging in an undrained state, the excavation resistance becomes large and the excavation can no longer proceed without excavating the soil, the excavation A pile construction method characterized in that the apparatus is removed from the steel pipe or casing tube, the steel pipe or casing tube is rotationally pressed into the ground to a predetermined depth, and the earth and sand in the steel pipe or casing tube is discharged by a bucket. . A drilling device having a drilling tool and detachable in a cylindrical body by a grip mechanism is mounted so as to rotate integrally with a lower end portion of a steel pipe or a casing tube, and a tubing device is provided with the drilling device. It is a pile construction method that digs a pile hole by lowering while holding and rotating,
When the soil excavated by the excavator of the excavator is pushed out to the outside of the steel pipe or the casing tube and digging in the no-draining state, the excavation resistance becomes large, and it becomes impossible to dig in the no-draining soil, Removing the drilling rig from the steel pipe or casing tube;
After that, when excavating the ground by excavating the ground by inserting the excavation bucket into the steel pipe or casing tube and discharging the earth and sand stored in the bucket to the ground, excavation with the excavation bucket at the same time or to a certain depth After that, the pile construction method is characterized by repeatedly press-fitting the steel pipe or casing tube into the ground by the tubing device, and press-fitting the steel pipe or casing tube to a predetermined depth. In the pile construction method according to claim 8 or claim 9,
A pile construction method characterized in that earth and sand discharged by the bucket is backfilled again in a steel pipe or a casing tube.

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