JP4568438B2 - Inner tank of cylindrical pile, press-fitting method of cylindrical pile, and construction method of cylindrical pile. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is an inner tank of a cylindrical pile that is disposed inside a cylindrical pile and accommodates earth and sand that enters the cylindrical pile from the lower end side of the cylindrical pile when the cylindrical pile is pushed into the ground. The present invention also relates to a method for press-fitting a cylindrical pile using the same and a method for constructing the cylindrical pile.
[0002]
[Prior art]
The present applicant has developed a pile press-fitting and drawing machine (pile press-fitting machine) that takes a reaction force from an existing pile and presses and pulls the pile, and has improved the pile press-fitting and drawing machine.
The pile presser basically includes a saddle provided with a clamp at a lower portion for gripping a previously press-fitted pile, a slide base that slides back and forth with respect to the saddle, and a swivel portion that rotates on the slide base. Further, it is possible to move up and down by a hydraulic cylinder in front of the swivel unit, and to include a chuck for gripping the pile. And the pile press-in device is a device that presses the pile that has already been driven in with the clamp and presses the pile held by the chuck into the ground by taking the reaction force from the existing pile. It is. In addition, various types of pile press-fitting / pulling machines have been developed depending on the type of pile to be press-fitted and the situation at the time of press-fitting. For example, one that press-fits a cylindrical pile such as a steel pipe is known. It has been.
[0003]
[Problems to be solved by the invention]
By the way, when a cylindrical pile (cylindrical pile) is press-fitted into the ground, earth and sand will enter the inside. In addition, since the earth and sand that enters the cylindrical pile in response to the descending amount of the cylindrical pile receives resistance from the inner peripheral surface of the cylindrical pile, it corresponds to the press-fitting of the cylindrical pile within the lower end of the cylindrical pile. It will be consolidated. As a result, as the press-fitting continues, it becomes difficult for the earth and sand to enter the cylindrical pile, and a large tip resistance is generated even inside the cylindrical pile at the tip of the cylindrical pile, and the cylindrical pile is press-fitted. However, a large pressure input is required.
[0004]
An object of the present invention is to prevent earth and sand from being consolidated in a lower end portion inside a pile when a cylindrical pile is press-fitted, thereby increasing a tip resistance.
[0005]
[Means for Solving the Problems]
Claim 1 The described invention is arranged inside a cylindrical pile (steel pipe pile 2), for example, as shown in FIGS. 1 and 5, and when the cylindrical pile is pushed into the ground, from the lower end side of the cylindrical pile. An inner tank 1 of the cylindrical pile in which soil materials such as earth and sand, stones, and underground obstacles entering the cylindrical pile are accommodated, and a hollow tank portion 3 having a lower end opened, and the tank A cylindrical pile comprising: fixing means 4 for removably fixing the portion to the cylindrical pile; and extrusion means 7 for extruding the ground material stored in the tank portion from the opened lower end side. This is an inner tank.
[0006]
Claim 2 For example, as shown in FIGS. 1 and 6, the described invention is arranged inside a cylindrical pile (steel pipe pile 2), and pushes the cylindrical pile into the ground from the lower end side of the cylindrical pile. An inner tank 1 of the cylindrical pile in which soil materials such as earth and sand, stones, and underground obstacles entering the cylindrical pile are accommodated, and a hollow tank portion 3 having a lower end opened, and the tank It is an inner tank of a cylindrical pile characterized by comprising fixing means 4 for detachably fixing the part to the cylindrical pile and self-propelled means 8 for moving up and down in the cylindrical pile. .
[0007]
Here, the ground material is mainly the earth and sand that constitutes the ground, but not only the earth and sand with a small particle size, but also stones with a large particle size, pile construction such as artificial objects buried in the ground It includes things that sometimes become obstacles, including everything that is in the ground and enters the cylindrical pile when the cylindrical pile is press-fitted. Moreover, below, a ground material may be called earth and sand.
Claim 1 above 2 According to the structure, the earth and sand etc. which are consolidated by the lower end part at the time of press injection of a cylindrical pile can be accommodated in the tank part of the inner tank previously arrange | positioned in a pile and being fixed to the fixing means. And before the tip resistance at the time of press-fitting of the cylindrical pile increases due to consolidation of earth and sand in the inner tank, the fixing means is released and the inner tank is taken out of the cylindrical pile. Drain the earth and sand and press the piles again. As a result, it is possible to prevent the tip resistance from increasing due to consolidation of sand and the like at the tip of the pile, and to press-fit the pile with a small pressure input, thereby reducing costs and saving energy. The inner tank fixing means may be configured to fix the inner tank at an arbitrary position in the cylindrical pile.
In addition, it is not always necessary to drain the sand and sand contained in the inner tank outside the cylindrical pile, and the inner tank is placed near the lower end of the cylindrical pile (including the lower end), and press-fitting of the pile is started. After the ground material is accommodated in the inner tank, the inner tank is raised in the cylindrical pile to raise it to the upper part of the cylindrical pile, thereby forming a space at the lower end of the cylindrical pile, The tip resistance of the pile may be prevented from increasing as described above, and in this case, the pile can be press-fitted without draining soil.
[0008]
Also, Claim 1 According to this configuration, when discharging the earth and sand in the tank portion, the earth and sand can be easily pushed out from the tank portion by the pushing means. Moreover, when the press-fitting of the cylindrical pile is finished, the soil and sand in the bottom of the cylindrical pile can be consolidated and solidified by pushing out the sand and the like in the tank portion at the lower end of the cylindrical pile. . Moreover, in this case, it is good also as what returns while pressing earth and sand etc. further upwards from the lower end part inside a cylindrical pile, and is good also as what returns earth and sand etc. to the whole inside of a cylindrical pile. In this way, the pile strength can be increased by pressing the ground material such as earth and sand further above the lower end of the inside of the cylindrical pile and returning it by consolidation.
[0009]
Moreover, in order to take out the inner tank from the cylindrical pile, it is basically necessary to lift the inner tank. When the inner tank is arranged at the lower end of the pile, the inner tank is connected to a crane, for example. Since it is difficult to connect or disconnect wires or the like, it is necessary to always connect wires to the inner tank.
Therefore, the above claims 2 If the inner tank is designed to be self-propelled up and down like the configuration of, the inner tank can be easily fixed at any position in the cylindrical pile and the inner tank can be moved to the upper end of the cylindrical pile. Then, at the upper end of the cylindrical pile, the inner tank can be lifted by hooking a hook of a crane or the like on the inner tank. Therefore, there is no need to always connect a wire to the inner tank, and the handling of the wire does not take time. In particular, if the configuration does not require a line or a tube for supplying a signal or driving force as will be described later, the handling of the inner tank is further facilitated.
[0010]
Claim 3 The described invention is, for example, as shown in FIG. 1 Or 2 The tubular pile inner tank according to claim 1, wherein the tubular pile inner tank is provided with a fall prevention means 5 for preventing the ground material from dropping from the opened lower end portion of the tank portion.
[0011]
When clayey earth and sand is stored in the inner tank in a state of being somewhat consolidated, when the inner tank is raised in the cylindrical pile, it does not fall even if the lower end side of the tank part of the inner tank is open However, earth and sand containing a lot of stones, gravel, etc. or sandy earth and sand will fall if the lower end of the tank part is open, and the earth and sand will accumulate at the lower end of the cylindrical pile. Moreover, when discharging | emitting the said earth and sand etc. out of a cylindrical pile, there exists a possibility that it cannot discharge | emit well.
Therefore, the above claims 3 According to this configuration, since there is a fall prevention means, it is possible to prevent the fall of earth and sand as described above, and to reliably discharge the earth and sand etc. out of the cylindrical pile. The fall prevention means may be, for example, an opening / closing member that opens and closes the opened lower end of the tank portion, but it is not necessary to completely close the lower end of the tank portion, and the earth and sand are difficult to fall. It is sufficient that the opening is narrowed to such an extent. Therefore, the fall prevention means is not limited to the opening / closing member, and may be one that can narrow or widen the opening at the lower end of the tank part, or the diameter of the tank part as a whole, It may be configured to narrow the width and sandwich the earth and sand.
[0012]
Claim 4 The described invention is, for example, as shown in FIG. 3 In the inner tank of the cylindrical pile according to any one of the above, the power source (battery 9) is provided inside, and remote control means (receiver 91) that enables wireless remote control is provided, and the power source And an inner tank of a cylindrical pile that is operated by the remote control means and wirelessly operated from outside by the remote control means.
[0013]
According to the above configuration, the fixing means for fixing the inner tank in the cylindrical pile, the fall prevention means for earth and sand in the inner tank, the extrusion means for pushing out the earth and sand in the inner tank, and the inner tank in the cylindrical pile. It is equipped with a power source such as a self-propelled means for self-propelled up and down inside, and these can be remotely operated wirelessly, so there is no need to connect wires and pipes for transmitting power and signals to the inner tank, The inner tank can be handled easily.
[0014]
Claim 5 The described invention is disposed inside a cylindrical pile, and when pushing the cylindrical pile into the ground, earth and sand, stones, underground obstacles, etc. that enter the cylindrical pile from the lower end side of the cylindrical pile The tubular pile press-in method using the tubular pile inner tank in which the ground material is accommodated, wherein the tubular pile inner tank includes a hollow tank portion having a lower end opened, and the tank portion And fixing means for detachably fixing to the cylindrical pile, the inner tank is disposed in the cylindrical pile, and the inner tank is fixed near the tip of the cylindrical pile by the fixing means. In this state, after the press-fitting process of starting press-fitting of the cylindrical pile and the ground material entering the cylindrical pile are accommodated in the tank portion of the inner tank, the inner tank is placed in the cylindrical pile. The upper stroke of the upper tank and the inner tank After forming the space at the tip portion of the cylindrical pile by raising again the press-fitting method of a tubular pile, characterized in that it comprises a secondary press-fitting step of performing press-fitting of the tubular pile.
[0015]
According to the said structure, after accommodating the ground material in an inner tank by arrange | positioning an inner tank near the lower end part (including a lower end part) of a cylindrical pile as mentioned above, and starting the press injection of a pile. The inner tank is raised in the cylindrical pile to raise it to the upper part of the cylindrical pile, thereby forming a space at the lower end of the cylindrical pile and preventing the tip resistance of the cylindrical pile from increasing as described above. can do. In this case, since the earth and sand in the inner tank stays in the cylindrical pile together with the inner tank, the pile can be press-fitted without draining. In addition, when press-fitting a pile without draining soil, the earth and sand in the inner tank is returned to the pile, but the inner tank may be provided with the extrusion means according to claim 3, In this case, the earth and sand can be easily returned into the pile, and the earth and sand can be consolidated in the pile.
[0018]
Claim 6 The invention described is the claim. 5 The cylindrical pile press-in method according to claim 1, wherein the cylindrical pile is press-fitted by a pile press-in machine provided with a pile chuck that holds the cylindrical pile and moves up and down during the press-fitting of the cylindrical pile. This is a method for press-fitting a cylindrical pile.
[0019]
According to the above configuration, in the pile press-in machine for press-fitting a conventional cylindrical pile, it is possible to reduce the press input necessary for press-in of the cylindrical pile, and it is difficult to press-in with the maximum press input of the pile press-in machine. Even in the situation, the pile can be press-fitted, and the pile press-fitting machine can increase the situation where the pile can be press-fitted. Note that the pile chuck may be one that can rotate the cylindrical pile, and may rotate the cylindrical pile around its axis at the time of press-fitting.
[0020]
Claim 5 Or 6 In the press-fitting method of the cylindrical pile described in 1., the cylindrical pile may be a cylindrical one, and when the cylindrical pile is press-fitted, the cylindrical pile may be rotated about its axis as a rotation center.
[0021]
According to the above configuration, in the pile press-in machine that rotates and presses the cylindrical pile, it is possible to reduce the press input necessary for press-in the cylindrical pile, and it is difficult to press-in with the maximum press input of the pile press-in machine. It is possible to press-fit a pile even in a difficult situation, and it is possible to increase the situation in which the pile can be press-fitted by a pile press-in machine.
[0022]
Claim 8 The invention described is a hollow tank part inserted into the inside of a cylindrical pile and having a lower end opened, fixing means for detachably fixing the tank part to the cylindrical pile, and storage in the tank part A method of constructing a cylindrical pile using an inner tank equipped with an extrusion means for extruding ground material or backfill material such as earth and sand, stones, underground obstacles, etc. from the opened lower end side, After embedding in the ground, it is the construction method of the cylindrical pile characterized by extruding the ground material or the backfilling material into the cylindrical pile using the inner tank provided with the extrusion means and compacting.
[0023]
According to the above configuration, the support force at the tip of the pile is obtained by extruding the sand and the like and the backfill material from the inner tank into the cylindrical pile by the means for pushing out the inner tank and compressing it. The pile strength can be increased in the pile body. In addition, as the backfilling material, waste that can be buried can be used. In addition, when storing the ground material or backfill material in the inner tank in order to backfill in the cylindrical pile, the ground material discharged outside the cylindrical pile or the prepared backfill material is stored in the inner tank. It is good also as what is accommodated in the inside, and when using the above-mentioned method of press-fitting a cylindrical pile, the ground material that is finally accommodated in the inner tank at the time of press-fitting the cylindrical pile may be used as it is.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Below, the inner tank of the cylindrical pile of the 1st example of embodiment of this invention, the press-fitting method of a cylindrical pile, and the construction method of a cylindrical pile are demonstrated with reference to drawings. As shown in FIG. 1 (A), an inner tank 1 is installed and used in a cylindrical steel pipe pile 2 (tubular pile), and has a cylindrical tank portion 3 with a lower end opened, The fixing means 4 is provided on the tank portion 3 and detachably fixes the inner tank 1 at an arbitrary height position in the steel pipe pile 2.
[0025]
The tank portion 3 is a cylindrical body having an outer diameter slightly smaller than the inner diameter of the steel pipe pile 2 and can move up and down in the steel pipe pile 2. Moreover, when the steel pipe pile 2 is press-fitted in a state where the tank portion 3 of the inner tank 1 is fixed to the lower end portion of the steel pipe pile 2 by the fixing means 4, the tank portion 3 is filled with earth and sand. Air and water are discharged from the vent hole b. The fixing means 4 includes a plurality of fixed cylinder devices 41 and 41 that are radially arranged such that the piston rod 42 faces outward along the radial direction of the tank portion 3 (in the case of two fixed cylinder devices 41 and 41, the tank portion 3 is installed on the tank part 3 in a straight line along the diameter direction of 3. And in the steel pipe pile 2, the tank part 3 connected to the fixing means 4 and the fixing means 4 is extended by extending the piston rods 42 and 42 of the fixed cylinder devices 41 and 41 and pressing them against the inner peripheral surface of the steel pipe pile 2. The provided inner tank 1 is detachably fixed at an arbitrary height position of the steel pipe pile 2. In addition, hydraulic pipes 44 and 44 are connected to the fixed cylinder device 41, and contact members 45 and 45 for increasing the frictional force with the inner surface of the steel pipe pile 2 are provided at the tip portions of the piston rods 42 and 42. It is attached.
[0026]
Next, a press-in method (construction method) of the steel pipe pile 2 using the inner tank 1 as described above will be described. First, as a press-fitting process, as shown in FIG. 1 (B), the fixing means 4 is used in the steel pipe pile 2 so that the lower end of the inner tank 1 and the lower end of the steel pipe pile 2 are substantially at the same height position. The inner tank 1 is fixed. Next, the steel pipe pile 2 is press-fitted into the ground. Then, according to the descending amount of the steel pipe pile 2, the earth and sand in the tank part 3 in the inner tank 1 is filled, and the earth and sand starts to be consolidated in the tank part 3 due to the inner surface resistance in the tank part 3. Here, if the press-fitting is continued as it is, the tip resistance increases due to the consolidation of the earth and sand within the lower end portion of the steel pipe pile 2 as in the prior art.
[0027]
Therefore, at this stage, the press-fitting is stopped (end of the press-fitting process), and as a soil removal process, the fixing of the inner tank 1 to the steel pipe pile 2 by the fixing means 4 is released as shown in FIG. The tank 1 is pulled up with a crane or the like, for example, and taken out of the steel pipe pile 2, and the earth and sand in the tank portion 3 is discharged (end of the earth removal process). And as shown in FIG.1 (D) again, as shown in FIG.1 (D), the earthed inner tank 1 is returned in the steel pipe pile 2, and the inner tank 1 is fixed to the steel pipe pile 2 as mentioned above. In this case, the lower end portion of the steel pipe pile 2 is already in the ground, and it is difficult to attach the inner tank 1 from the outside of the steel pipe pile 2, but as described above, the fixed cylinder device of the fixing means 4 By operating 41 and 41, the inner tank 1 can be fixed to the lower end part of the steel pipe pile 2 of the state embed | buried under the ground easily. Then, the steel pipe pile 2 is press-fitted, and when the soil is collected in the tank portion 3 of the inner tank 1, the above-described soil removal process is performed. Then, the steel pipe pile 2 is press-fitted to a predetermined depth by repeating the press-fitting process and the soil discharging process.
[0028]
As described above, the sand and sand entering the lower end of the steel pipe pile 2 are sequentially discharged using the inner tank, and the sand and sand is consolidated at the lower end of the steel pipe pile 2, so that the tip resistance when the steel pipe pile 2 is press-fitted. Can be prevented from becoming large. Therefore, since the pressure input required for the steel pipe pile 2 can be reduced, it is possible to reduce the cost required for press-fitting and to save energy. Moreover, since the maximum press input required as an apparatus which press-fits a pile can also be reduced, the reduction of the cost of a press-fit apparatus can be aimed at.
[0029]
The method of press-fitting a cylindrical pile using the inner tank 1 is not limited to the above-described one, and after the press-fitting process is finished, the inner tank 1 is raised above the steel pipe pile 2 and the inner pile 1 The tank 1 is fixed to the upper part of the steel pipe pile 2 (upward stroke). Next, press-fitting of the steel pipe pile 2 is started again (secondary press-fitting process) while the inner tank 1 is fixed to the upper part of the steel pipe pile 2. Thereby, the earth and sand etc. which entered the lower part of the steel pipe pile 2 in the press-fitting process as in the case described above rise together with the inner tank 1, so that a space is formed in the lower part of the steel pipe pile 2. In press-fitting, it is possible to prevent the press-fitting resistance from being increased by the earth and sand consolidated at the lower end of the steel pipe pile 2. According to this press-fitting method, the sand and sand at the lower end of the steel pipe pile 1 cannot be removed repeatedly by the inner tank 1 as in the above-described press-fitting method, but without draining the earth and sand contained in the inner tank 1, Since the steel pipe pile 2 is simply raised in the steel pipe pile 2, the steel pipe pile 1 can be press-fitted without soil removal.
[0030]
Moreover, it is good also as what uses the pile press-fit drawing machine 100 shown in FIG. 2 as an apparatus which press-fits a cylindrical pile. The pile press-fitting / pulling machine 100 is, for example, a saddle 102 provided with a clamp 101 at the lower part thereof, which is fixed to the previously pressed-in cylindrical pile by pushing it open from the inside thereof, in substantially the same manner as described in the prior art. A slide base 103 that slides back and forth with respect to the saddle 102, a turning portion 104 that turns on the slide base 103, a hydraulic cylinder 105 that can be moved up and down by the hydraulic cylinder 105 in front of the turning portion 104, and the steel pipe pile 2 And a chuck 106 for gripping. Further, the pile chuck 106 may rotate the pile at the time of press-fitting.
[0031]
Moreover, as shown in FIG. 3, it is good also as what is provided with the fall prevention means 5 provided with the opening-and-closing mechanism in the lower end part of the tank part 3. As shown in FIG. The fall prevention means 5 includes, for example, two arc plate-like opening / closing plates 51, 51 in a state of being pivotally coupled to the lower end portion of the tank portion 3, and an opening / closing cylinder that drives the arc plate-like opening / closing plates 51, 51. Devices 52, 52. The arc plate-like opening / closing plates 51, 51 are substantially semicircular arc plates, and both end portions on the upper side thereof are pin-coupled, so that the outer peripheral surface extends from the state along the outer peripheral surface of the tank portion 3 to the tip portion. Is rotated to a state in which it is inclined toward the center side of the tank portion 3. Further, the left and right side edges of the arc plate-like opening / closing plates 51, 51 are slanted sides such that the left and right widths of the arc plate-like opening / closing plates 51, 51 become narrower as going downward.
[0032]
The two arcuate plate-like opening / closing plates 51, 51 are mutually connected. Opposite In this state, the cylindrical portion is substantially the same as the tank portion 3, and a triangular gap is formed such that the portion where the side edges facing each other's oblique sides face each other expands downward. And the fall prevention means 5 will be in the state which the lower end side opened in the state substantially the same as the lower end side of the tank part 3 in the state where the two circular-plate-shaped opening-and-closing plates 51 and 51 followed the outer periphery of the tank part 3. Further, by rotating the two arcuate plate-like opening / closing plates 51, 51 so that the lower end portions of the two arcuate plate-like opening / closing plates 51, 51 are close to each other, the opening on the lower end side is narrowed and the tank The earth and sand can be sandwiched between the two arc-shaped plate-like opening and closing plates 51 and 51 on the lower side of the section 3 so that the earth and sand in the tank section 3 is prevented from falling. The open / close cylinder devices 52, 52 are arranged on the upper portion of the tank unit 3, and the long piston rods 53, 53 are linked to the lower circular arc plate in a link shape. Is driven to rotate as described above. Note that hydraulic cylinders (not shown) are connected to the open / close cylinder devices 52 and 52.
[0033]
Further, as shown in FIG. 4, the fall prevention means 6 may be substantially integrated with the tank portion 3. That is, the tank portion 3 may be composed of two arcuate plate-like holding plates 61, 61 in which the arcuate plate-like opening / closing plates 51, 51 of the fall prevention means 6 shown in FIG. The arcuate plate-like holding plates 61, 61 are pin-coupled to the housing of the fixing means 4 on the tank unit 3 so that both ends of the arcuate plate-like holding plates 61, 61 are rotatable. While operating, the arc plate-like open / close plates 51, 51 are made to be elongated vertically.
[0034]
When the two arcuate plate-like sandwiching plates 61, 61 are opened, the tank portion 3 has a substantially cylindrical shape, and when the two arcuate plate-like sandwiching plates 61, 61 are closed, the arc plate-like sandwiching plates 61, 61 are opposed to each other. The shape becomes narrower toward the bottom, and the opening at the lower end of the tank portion 3 becomes narrow. In this state, almost the entire tank unit 3 is in a state in which the earth and sand in the tank unit 3 are sandwiched between the two arc plate-shaped sandwiching plates 61, 61, and the opening of the lower end is narrowed. The fall of earth and sand inside is suppressed.
As in the case of the arc plate-like opening and closing plates 51, 51, in the opened state, a triangular gap is formed between the arc plate-like holding plates 61, 61, but these are surrounded by the steel pipe pile 2. Therefore, there is no such thing as earth and sand coming out of the gap. Further, the opening and closing of the two arcuate plate-like sandwiching plates 61, 61 are driven by an opening / closing cylinder device 61 that is connected to the two arcuate plate-like sandwiching plates 61, 61 at both ends and arranged substantially horizontally. It is good as a thing.
[0035]
By using the fall prevention means 5 and 6 as described above, the inner tank 1 is connected to the steel pipe pile as shown in FIGS. 3 (B) and 4 (B). When taking out from 2, the fall prevention means 5 and 6 can be closed to prevent earth and sand from falling. Moreover, after taking out the inner tank 1 from the steel pipe pile 2, the earth and sand can be discharged | emitted by making the fall prevention means 5 and 6 into the open state. Moreover, at the time of a press-fit process, as shown to FIG. 3 (A) and FIG. 4 (A), by making the fall prevention means 5 and 6 into the open state, the earth and sand in the tank part 3 at the time of the press-fitting of the steel pipe pile 2 is carried out. Can be accommodated. Note that the fall prevention means 5 and 6 may be opened larger than the state shown in FIGS. 3A and 4A when the earth and sand are discharged. Further, the arc plate-like opening / closing plates 51 and 51 and the arc plate-like holding plates 61 and 61 may be two or more.
[0036]
Further, the inner tank 1 may be provided with an extruding means 7 for extruding the earth and sand in the tank unit 3 from the opened lower end of the tank unit 3 as shown in FIG. For example, the extruding means 7 includes an extruding cylinder device 72 fixed on the tank unit 3 with the piston rod 71 facing downward, and a pressing plate 73 that is provided at the tip of the piston rod 71 and extrudes earth and sand. It is. The pressing plate 73 is a disc having an outer diameter slightly smaller than the inner diameter of the tank unit 3, is disposed substantially horizontally inside the tank unit 3 disposed substantially vertically, and is arranged at the lower end from the upper end portion inside the tank unit 3. It is driven by the extrusion cylinder device 72 to move to the part. And the press plate 73 is arrange | positioned at the upper end part in the tank part 3 at the time of a press injection process, and earth and sand etc. are accommodated under the press plate 73. FIG. And at the time of a discharge process, in the inner tank 1 taken out of the steel pipe pile 2, even if it is the state in which the earth and sand in the tank part 3 were consolidated by moving the press plate 73 below by the extrusion cylinder apparatus 72, It can be easily earthed.
[0037]
Moreover, when the steel pipe pile 2 was press-fitted to a predetermined depth and the press-fitting work of the steel pipe pile 2 was finished, the inner tank 1 was slightly raised from the lower end inside the steel pipe pile 2 without performing the final earth removal step. It may be fixed at the position, and the sand in the tank unit 3 may be pushed out by the pressing means 7 and the sand and sand may be consolidated by the driving force of the extrusion cylinder device 72. Thereby, the earth and sand are consolidated in the lower end part of the steel pipe pile 2, and it will be in the solidified state and the drawing stress of the steel pipe pile 2 can be raised. In addition, after the earth and sand is consolidated at the lower end of the steel pipe pile 2, the earth and sand removed by the inner tank 1 is backfilled in the steel pipe pile 2 by a procedure reverse to the earth removing process, and the pressing means 7 is used for consolidation. You may do it. Thereby, the pile strength of the steel pipe pile 2 can be increased.
Moreover, what is refilled in the steel pipe pile 2 is not limited to the earth and sand discharged, but a refill material prepared separately may be used. Furthermore, as the backfilling material, waste that can be buried may be used, so that the waste can be effectively used.
Further, the backfilling of the ground material and backfilling material in the cylindrical pile using the extrusion means 7 of the inner tank 1 can be applied in addition to the above-described method of press-fitting the cylindrical pile, When the inner pile 1 is buried in the ground in a state where the inside is discharged, the inner tank 1 is used, and the discharged ground material or the backfill material is accommodated in the inner tank 1, and then The inner tank 1 may be returned into the cylindrical pile, and the ground material and the backfill material may be backfilled in the cylindrical pile and consolidated in the same manner as described above. Also in this case, by compressing the ground material and the backfill material inside the pile, the supporting force can be enhanced at the pile tip portion, and the pile strength can be enhanced at the pile body portion above it.
[0038]
Moreover, as shown in FIG. 6, the inner tank 1 is good also as what is provided with the self-propelled means 8 which moves self up and down within the steel pipe pile 2. As shown in FIG. The self-propelled means 8 is, for example, one in which the above-described two fixing means 4 are arranged up and down, and these fixing means 4 can be moved up and down by a self-propelled cylinder device 81. That is, the self-propelling means 8 is connected to the first fixing means 4 fixed on the tank portion 3, the self-propelling cylinder device 81 connected to the first fixing means 4, and the upper part of the self-propelling cylinder device 81. The second fixing means 4 is provided.
[0039]
For example, when the inner tank 1 is raised using the self-propelled means 8, the inner surface of the steel pipe pile 2 is fixed by the fixed cylinder device 41 of the first and second fixing means 4, as shown in FIG. From the state where the inner tank 1 is fixed by pressing, first, as shown in FIG. 7B, the piston rod 42 of the fixed cylinder device 41 of the upper second fixing means 4 is moved backward to release the fixing. To do. And as shown in FIG.7 (C), the 2nd fixing means is raised by extending the piston rod 82 of the self-propelled cylinder apparatus 81. FIG. Then figure 7 As shown in (D), the second fixing means 4 is fixed in the steel pipe pile 2. Then figure 7 As shown to (E), the fixation with respect to the steel pipe pile 2 of the 1st fixing means 4 is cancelled | released. Next, the piston rod 82 of the self-propelled cylinder device 81 is retracted and contracted to pull up the first fixing means 4 to which the tank unit 3 is connected. By such an operation, the inner tank 1 is raised once, and can be further increased by repeating these operations. Moreover, the inner tank 1 can be lowered | hung by operating in reverse procedure.
[0040]
This self-propelled means eliminates the need for operations such as suspending the inner tank 1 with a crane in the steel pipe pile 2 and facilitates handling of the inner tank 1. Further, this eliminates the need to connect a wire or the like to the inner tank 1 in the steel pipe pile 2, but further, as shown in FIG. If the remote control receiver 91 used is provided, pipes for supplying hydraulic pressure and lines for sending signals are not necessary, and the inner tank 1 can be easily handled.
[0041]
That is, in the inner tank 1, hydraulic pressure is applied to the battery 9 as a power source, the receiver 91 that receives a control signal from the outside, the antenna 92 of the receiver 91, the fixed cylinder device 41. A pump 93 to be supplied, an electric motor 94 for driving the pump 93, and a valve 95 for operating the fixed cylinder device 41 and the self-propelled cylinder device 81 may be provided. The receiver 91 operates with power supplied from the battery 9 and receives a control signal from the outside, and based on the control signal, a control signal (direct drive power may be sent) to each valve 95. It has a function as a control device as well as a reception function.
The valves 95 are used to switch the hydraulic pressure so that the fixed cylinder devices 41 and the self-propelled cylinder device 81 expand and contract. Hydraulic pressure is supplied to the fixed cylinder devices 41 and the self-propelled cylinder device 81 through the valve 95 by the electric motor 94 and the pump 93. And the fixing means 4 and the self-propelled means 8 operate | move by the radio signal from the outside. In the inner tank 1 without the self-propelling means 8, the fixing means 4 may be driven by the battery 9 and remotely operated by radio.
[0042]
In the above example, a cylindrical steel pipe pile is used as the cylindrical pile, but a square steel pipe pile may be used, or a cylindrical concrete pile having various cross-sectional shapes may be used. Moreover, when applying this invention to cylindrical piles other than cylindrical shape, it is preferable to make the shape of the tank part 3 correspond to the internal shape of a cylindrical pile.
The inner tank may have a power source for operating the fixing means, the fall prevention means, the pushing means, the self-propelled means, etc., basically either inside or outside. The transmission / reception may be wired or wireless.
[0043]
【The invention's effect】
According to the present invention, since the inner tank can remove the earth and sand that is normally consolidated inside the pile and increases the tip resistance during the press-fitting of the cylindrical pile, it is necessary to press-fit the cylindrical pile. Pressure input can be reduced.
[Brief description of the drawings]
FIG. 1 is a view for explaining a portable tubular pile inner tank and a tubular pile press-fitting method of the present embodiment.
FIG. 2 is a side view showing a pile press-fitting and extracting machine used in the cylindrical pile press-in method of the above example.
FIG. 3 is a cross-sectional view showing an inner tank which is a modification of the above example.
FIG. 4 is a cross-sectional view showing an inner tank which is another modified example of the above example.
FIG. 5 is a cross-sectional view showing an inner tank which is another modified example of the above example.
FIG. 6 is a cross-sectional view showing an inner tank which is another modified example of the above example.
7 is a drawing for explaining a self-running operation of the modified example shown in FIG. 5. FIG.
FIG. 8 is a schematic view for explaining an inner tank which is another modified example of the above example.
[Explanation of symbols]
1 Inner tank
2 Steel pipe pile (tubular pile)
3 Tank part
4 Fixing means
5,6 Fall prevention means
7 Extruding means
8 Self-propelled means
9 Battery (drive source)
91 Receiver (remote control means)
100 Pile press-fitting and drawing machine

Claims (8)

Arranged inside the cylindrical pile, when pushing the cylindrical pile into the ground, soil materials such as earth and sand, stones, and underground obstacles entering the cylindrical pile from the lower end side of the cylindrical pile are accommodated An inner tank of the cylindrical pile,
A hollow tank part whose lower end is opened;
Fixing means for detachably fixing the tank portion to the cylindrical pile;
An inner tank for a cylindrical pile, comprising: extrusion means for extruding the ground material stored in the tank portion from the opened lower end side. Arranged inside the cylindrical pile, when pushing the cylindrical pile into the ground, soil materials such as earth and sand, stones, and underground obstacles entering the cylindrical pile from the lower end side of the cylindrical pile are accommodated An inner tank of the cylindrical pile,
A hollow tank part whose lower end is opened;
Fixing means for detachably fixing the tank portion to the cylindrical pile;
An inner tank for a cylindrical pile, comprising self-propelled means for moving up and down in the cylindrical pile. In the inner tank of the cylindrical pile according to claim 1 or 2 ,
An inner tank for a cylindrical pile, comprising a fall prevention means for preventing the ground material from falling from the opened lower end of the tank part. In the inner tank of the cylindrical pile according to any one of claims 1 to 3 ,
A cylinder comprising a power source inside and remote control means that enables remote operation wirelessly, and is operated by the power source and is remotely operated from outside by the remote control means. Shaped inner tank. Arranged inside the cylindrical pile, when pushing the cylindrical pile into the ground, soil materials such as earth and sand, stones, and underground obstacles entering the cylindrical pile from the lower end side of the cylindrical pile are accommodated A method for press-fitting a cylindrical pile using an inner tank of the cylindrical pile,
The inner tank of the cylindrical pile includes a hollow tank part whose lower end side is open, and a fixing means for removably fixing the tank part to the cylindrical pile,
While pressing the inner tank in the cylindrical pile, in a state where the inner tank is fixed in the vicinity of the distal end portion in the cylindrical pile by the fixing means, a press-fitting step of starting the press-fitting of the cylindrical pile,
After accommodating the ground material entering the cylindrical pile in the tank portion of the inner tank, the ascending stroke of moving the inner tank to the upper side in the cylindrical pile,
A method of press-fitting a cylindrical pile, comprising: a secondary press-fitting step of press-fitting the cylindrical pile again after forming a space at the tip of the cylindrical pile by raising the inner tank. In the press-fitting method of the cylindrical pile according to claim 5 ,
A method of press-fitting a cylindrical pile, wherein the cylindrical pile is press-fitted by a pile press-in machine provided with a pile chuck that moves up and down while gripping the cylindrical pile. In the press-fitting method of the cylindrical pile according to claim 5 or 6 ,
A method of press-fitting a cylindrical pile, wherein the cylindrical pile is cylindrical, and when the cylindrical pile is press-fitted, the cylindrical pile is press-fitted while being rotated about its axis. A hollow tank part that is inserted into the inside of the cylindrical pile and the lower end side is opened,
Fixing means for detachably fixing the tank portion to the cylindrical pile;
It is a construction method of a cylindrical pile using an inner tank provided with extrusion means for extruding ground material or backfill material such as earth and sand, stone, underground obstacles, etc. stored in the tank part from the opened lower end side. And
After burying a cylindrical pile in the ground, the ground material or backfilling material is extruded into the cylindrical pile using an inner tank provided with the pushing means and consolidated, and the cylindrical pile is constructed. .

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