JP4191495B2 - Steel pipe pile method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel pipe pile construction method in which a steel pipe is installed in the ground to form a pile body.
[0002]
[Prior art]
Conventionally, as a steel pipe pile construction method in which a steel pipe is installed in the ground to form a pile body, as described in Japanese Patent No. 2935088, a rotary press is used to rotationally press the steel pipe into the ground by applying a rotational force. Are known. In this method, excavation is performed with a removable auger attached to the lowermost steel pipe, and when the excavation is completed, the steel pipe is reversely rotated to remove the auger from the steel pipe and collect it.
[0003]
[Patent Document 1]
Japanese Patent No. 2935088 [0004]
[Problems to be solved by the invention]
However, in the method described above, there is a possibility that the steel pipe cannot be pushed in smoothly. That is, excavation is performed by an auger attached to the steel pipe, and excavated soil is generated at that time. The excavated soil is discharged by a discharge pipe installed above the auger. However, since the discharge pipe is arranged far above the excavation position, the excavated soil cannot be discharged efficiently. For this reason, it may interfere with the pushing of the steel pipe, and there is a possibility that the steel pipe cannot be press-fitted smoothly.
[0005]
Then, this invention was made | formed in order to eliminate such a problem, Comprising: It aims at providing the steel pipe pile construction method which can press-fit a steel pipe smoothly.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, the steel pipe pile construction method according to the present invention is a steel pipe pile construction method in which a steel pipe is installed in the ground to form a pile body, and a drilling member is attached to a lower end position inside the steel pipe, inserting the lift mud pipe within the steel pipe is passed through the center of the drilling member, lifting and placing the mud tubes in steel and a separated state so as not to rotate together with the drilling member, rotating the drilling member with steel gives rotational force to the steel tube While excavating the inside of the steel pipe with the excavating member, the excavated soil is sucked and discharged from the steel pipe with the pumped muddy water pipe.
[0007]
The steel pipe pile construction method according to the present invention is characterized in that the steel pipe is rotationally press-fitted into the ground by a rotary press-fitting machine. The steel pipe pile construction method according to the present invention is characterized in that the excavation member is configured to be detachable from the steel pipe. The steel pipe pile construction method according to the present invention is characterized in that a pump is provided in the middle of the pumped muddy water pipe, and the muddy water is discharged upward through the pumped muddy water pipe by the operation of the pump.
[0008]
According to these inventions, since the muddy water pipe is provided through the excavation member, the suction port of the muddy water pipe can be arranged near the excavation position. For this reason, it becomes possible to discharge excavated soil efficiently. At that time, because the pumped muddy water pipe is separated from the drilling member and the steel pipe, there is no need to rotate the muddy water pipe, and there is no problem that the muddy water pipe is twisted with the rotation of the steel pipe, enabling smooth drilling. It becomes. In addition, since the pumped muddy water pipe does not rotate, a pump can be installed on the way. When a pump is provided in the middle of the pumped muddy water pipe, the soil removal performance by the pumped muddy water pipe can be improved, and a deep pile body can be constructed. In addition, the pumped mud water pipe penetrates the center of the excavation member, so that the excavated soil can be discharged more efficiently.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same element and description is abbreviate | omitted. Further, the dimensional ratios in the drawings do not necessarily match those described.
[0010]
(First embodiment)
The schematic diagram of the steel pipe pile construction method concerning this embodiment is shown in FIG. As shown to this figure, the steel pipe pile construction method which concerns on this embodiment pushes the steel pipe 1 in the ground, and makes it a pile body. The steel pipe 1 is configured by connecting a plurality of pipe bodies 1a. As the driving depth of the steel pipe 1 increases, a new pipe body 1a is connected to the upper portion thereof, and the number of connections increases.
[0011]
A pumped muddy water pipe 2 is inserted into the steel pipe 1. The pumped mud water pipe 2 is a pipe body for sucking excavated soil generated by excavation and discharging it from the steel pipe 1. The pumped muddy water pipe 2 is configured by connecting, for example, a pipe body 2a with a flange. Similarly to the steel pipe 1, the pumped mud water pipe 2 is connected to a new pipe body 2a on the upper portion of the steel pipe 1 as the driving depth of the steel pipe 1 increases, and the number of connections increases.
[0012]
A pump 4 is connected to the upper part of the pumped muddy water pipe 2 via a pipe 3. By the operation of the pump 4, a suction force is generated at the suction port 2 b of the pumped muddy water pipe 2, and the excavated soil is sucked and discharged from the steel pipe 1. The excavated soil is sent from the pump 4 to the tank 5. On the other hand, a pump 6 is disposed in the tank 5. The pump 6 is for supplying water into the steel pipe 1. By the operation of the pump 6, water or the like in the tank 5 is pumped into the steel pipe 1 through the pipe 7.
[0013]
A rotary press-fitting machine 8 is installed at the upper position of the steel pipe 1. The rotary press-fitting machine 8 is installed, for example, on the ground surface at the driving position of the steel pipe 1. This rotary press-fitting machine 8 functions as a rotational drive means for applying a rotational force to the steel pipe 1, and rotates the steel pipe 1 and press-fits it downward to push the steel pipe 1 into the ground.
[0014]
A drilling blade 10 is installed at the lower end position inside the steel pipe 1. The excavation blade 10 is an excavation member that excavates the inside of the steel pipe 1, is attached in the steel pipe 1, and is provided so as to rotate integrally with the steel pipe 1. For example, the excavation blade 10 includes a plurality of blade portions 11 extending radially from a central position. Further, the excavation blade 10 is provided with a central excavation part 12 in front of the suction port 2 b of the pumped mud water pipe 2. The central excavation part 12 is provided so as to protrude from the opening position of the suction port 2b.
[0015]
The excavation blade 10 is provided with a pumped muddy water pipe 2 therethrough. The pumped muddy water pipe 2 penetrates the central position of the excavating blade 10 and can suck excavated soil below the excavating blade 10. Here, “penetration” means that the pumped muddy water pipe 2 is inserted from above the excavation blade 10 and opened at the lower side of the excavation blade 10. Since the suction port 2b of the pumped muddy water pipe 2 is located at the center of the excavation range by the pumped mud water pipe 2 penetrating through the central portion of the excavating blade 10, the suction of the excavated soil can be efficiently performed.
[0016]
Further, the pumped muddy water pipe 2 is provided in a state separated from the rotating steel pipe 1 and the excavating blade 10. That is, the pumped mud water pipe 2 is provided so as not to rotate together with the steel pipe 1 and the excavating blade 10. A holding member 2 c is provided on the lowermost pipe body 2 a of the pumped muddy water pipe 2. The holding member 2 c is a member for holding the position of the pumped muddy water pipe 2 in the steel pipe 1, and extends in the horizontal direction from the side portion of the pipe body 2 a and its tip is located in the vicinity of the inner wall of the steel pipe 1. The holding mud pipe 2 is held at the center position of the steel pipe 1 by the holding member 2c.
[0017]
The excavation blade 10 is detachably attached to the steel pipe 1. For example, an attachment / detachment device 20 is installed on the excavation blade 10, and the attachment / detachment device 20 can be attached to and detached from the steel pipe 1 by the operation of the attachment / detachment device 20.
[0018]
2 and 3 are explanatory views of the attachment / detachment device.
[0019]
As shown in FIG. 2, as the attachment / detachment device 20, for example, a mechanical device is used. This detachable device 20 is configured to include a latching portion 30 and a moving mechanism 40. The latching portion 30 is attached to the excavating blade 10 and latches and unlocks the steel pipe 1. The latching portion 30 includes a tube 31 that is fixed to the upper portion of the excavating blade 1 and a piston 32 that slides within the tube 31.
[0020]
The tubes 31 are cylindrical bodies provided toward the inner wall of the steel pipe 1, and are installed one by one for each wing part 11 of the excavation wing 10, for example. The piston 32 is installed so that the tube 31 can slide within a predetermined range, and can move forward and backward toward the inner wall surface of the steel pipe 1. When the piston 32 moves to the inner wall side of the steel pipe 1, the tip of the piston 32 hooks the inner wall of the steel pipe 1. By this latching, the steel pipe 1 and the excavation blade 10 are integrated, and the excavation blade 10 rotates as the steel pipe 1 rotates.
[0021]
The moving mechanism 40 is a mechanism that moves the piston 32. For example, a mechanism that horizontally moves the piston 32 based on the vertical movement of the muddy water pipe 2 is used. The moving mechanism 40 is externally mounted on the pumped muddy water pipe 2 and moves upward when the muddy water pipe 2 is pulled up, and a link mechanism 42 that converts the upward moving force of the moving cylinder 41 into the retreating force of the piston 32. It has.
[0022]
When the pumped muddy water pipe 2 is pulled up with respect to the steel pipe 1 from the state of FIG. 2, as shown in FIG. 3, the movable cylinder 41 is pulled upward, and the piston 32 is pulled backward by the link mechanism 42 and moved backward. Thereby, the attachment / detachment device 20 is switched from the attachment state to the removal state, and the excavation blade 10 is removed from the steel pipe 1.
[0023]
On the other hand, when the pumped muddy water pipe 2 is lowered from the state shown in FIG. 3, the movable cylinder 41 moves downward as shown in FIG. 2, and the piston 32 is pushed forward by the link mechanism 42 and moves forward. Thereby, the attachment / detachment device 20 is switched from the removal state to the attachment state, and the excavation blade 10 is attached to the steel pipe 1.
[0024]
Next, the steel pipe pile construction method according to the present embodiment will be described in detail along the construction procedure.
[0025]
First, as shown in FIG. 4, the mouth pipe 51 is buried at the surface position where the steel pipe pile is constructed. By embedding the mouth tube 51, the surface portion is prevented from collapsing. A tower 52 is installed above the mouth tube 51. Then, the rotary press-fitting machine 8 is installed above the mouth tube 51. Then, the first steel pipe 1 is inserted into the mouth pipe 51. A drilling blade 10 and a pumped muddy water pipe 2 are attached to the first steel pipe 1 in advance. Thereby, the excavation blade 10 and the pumped muddy water pipe 2 can be installed simultaneously with the insertion of the steel pipe 1. The excavating blade 10 is attached to the steel pipe 1 by the attaching / detaching device 20.
[0026]
Then, as shown in FIG. 5, the rotary press-fitting machine 8 is operated to rotate the steel pipe 1 and press it downward. Due to the rotation of the steel pipe 1, the excavation blade 10 also rotates together. Thereby, the ground below the steel pipe 1 is excavated by the excavating blade 10. On the other hand, the inside of the steel pipe 1 is filled with water from the pipe 7. Then, the excavated soil is sucked by the pumped muddy water pipe 2.
[0027]
At this time, since the muddy water pipe 2 is provided through the excavating blade 10, the suction port 2b of the muddy water pipe 2 can be disposed near the excavation position. Therefore, the excavated soil generated below the excavating blade 10 can be efficiently sucked and discharged.
[0028]
Moreover, since the pumped muddy water pipe 2 is separated from the steel pipe 1 and the excavating blade 10, there is no need to rotate the muddy water pipe 2, and there is no problem that the muffled water pipe 2 is kinked with the rotation of the steel pipe 1. Smooth excavation is possible. Moreover, since the muddy water pipe 2 does not rotate, a pump can be installed in the middle of the muddy water pipe 2, and the soil removal performance by the muddy water pipe 2 can be improved. Therefore, it is suitable for construction of a deep pile body. Further, the pumped muddy water pipe 2 penetrates the center of the excavating blade 10. For this reason, the excavated soil can be discharged more efficiently.
[0029]
Then, after digging by one pipe body 1 a of the steel pipe 1, a new pipe body 2 a is connected to the upper part of the pumped muddy water pipe 2 and a new pipe body 1 a is connected to the upper part of the steel pipe 1. Then, the steel pipe 1 is rotationally pressed again and excavated to a predetermined depth.
[0030]
Then, when the lower end of the steel pipe 1 reaches a predetermined depth, the excavation work is finished, and the excavation blade 10 is recovered from the steel pipe 1. That is, as shown in FIG. 3, the muddy water pipe 2 is pulled upward. Then, the movable cylinder 41 is pulled upward, and the piston 32 is pulled backward by the link mechanism 42 to move backward. Thereby, the attachment / detachment device 20 is switched from the attachment state to the removal state, and the excavating blade 10 is removed from the steel pipe 1 and pulled up together with the pumped muddy water pipe 2. And it collect | recovers from the inside of the steel pipe 1. FIG.
[0031]
Then, as shown in FIG. 6, the rotary presser 8 is moved from above the steel pipe 1. Then, as shown in FIG. 7, the reinforcing bar 61 is built into the steel pipe 1. And as shown in FIG. 8, concrete is cast in the steel pipe 1, and construction of a steel pipe pile is completed.
[0032]
As described above, according to the steel pipe pile method according to the present embodiment, since the pumped muddy water pipe 2 is provided through the excavating blade 10, the excavated soil can be discharged efficiently. At that time, since the pumped muddy water pipe 2 is separated from the excavating blade 10 and the steel pipe 1, there is no need to rotate the pumped muddy water pipe 2, and there is no problem that the muddy water pipe 2 is kinked with the rotation of the steel pipe 1. Smooth excavation is possible.
[0033]
Moreover, since the pumped muddy water pipe 2 does not rotate, a pump can be installed in the middle of the pumped muddy water pipe, and the soil removal performance by the pumped muddy water pipe can be improved. Therefore, it is suitable for construction of a deep pile body. Moreover, when the muddy water pipe 2 penetrates the center of the excavating blade 10, the excavated soil can be discharged more efficiently.
[0034]
Further, by tilting the rotary press-fitting machine 8 that holds the steel pipe 1, the steel pipe pile can be easily constructed in a state tilted with respect to the vertical. At this time, since the muddy water pipe 2 is separated from the steel pipe 1, the problem is that the muddy water pipe 2 is not kinked when the steel pipe 1 is rotated, and the construction can be performed smoothly.
[0035]
Moreover, since the steel pipe 1 and the excavation blade 10 can be rotated by excavation by the operation of the rotary press-fitting machine 8, a compact rotary drive device can be used, and construction with a limited head is possible. This is particularly effective for underpinning.
[0036]
Moreover, since only the inside of the steel pipe 1 is excavated with the excavation blade 10, there is no possibility of collapse of natural ground during excavation, and construction can be performed smoothly.
[0037]
Moreover, since the press fitting of the steel pipe 1 and the excavation in the steel pipe 1 can be performed at the same time, the construction can be performed quickly. For this reason, the construction period can be shortened.
[0038]
Moreover, since it is not necessary to rotate the pumped muddy water pipe 2, it is not always necessary to connect the pipe body 2 a with excavation, so that the construction can be simplified.
[0039]
In the steel pipe pile construction method according to the present embodiment, the case where the mechanical attachment / detachment device 20 is used as the attachment / detachment device has been described. However, the steel pipe pile construction method according to the present invention is not necessarily limited to such a method. Other types such as a type in which the piston is advanced and retracted by hydraulic pressure may be used.
[0040]
(Second embodiment)
Next, the steel pipe pile construction method according to the second embodiment will be described.
[0041]
In 1st embodiment, although the case where the muddy water containing excavated soil was pumped up through the pumped muddy water pipe 2 by the pump 4 installed on the ground was explained, the steel pipe pile method according to the present embodiment is pumped in the middle of the muddy water pipe 2. 60 is installed to discharge muddy water from the steel pipe 1.
[0042]
FIG. 9 is an explanatory diagram of the steel pipe pile construction method according to the present embodiment. As shown in the figure, a pump 60 is installed in the middle of the pumped muddy water pipe 2. The installation of the pump 60 is performed in the same manner as the connection of the pipe bodies 2a performed as the excavation progresses. By installing the pump 60 in the middle of the pumped muddy water pipe 2 in this way, the head of the pumped muddy water pipe 2 can be increased, and it is possible to cope with deep excavation. Therefore, it is possible to construct a pile body having a deep depth.
[0043]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a steel pipe pile method that can efficiently excavate excavated soil and smoothly press-fit a steel pipe.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory diagram of a steel pipe pile construction method according to an embodiment of the present invention.
FIG. 2 is an explanatory view of an attachment / detachment device used in the steel pipe pile construction method of FIG.
FIG. 3 is an explanatory view of an attachment / detachment device used in the steel pipe pile construction method of FIG. 1;
FIG. 4 is a construction explanatory diagram of the steel pipe pile construction method of FIG. 1;
FIG. 5 is a construction explanatory diagram of the steel pipe pile construction method of FIG. 1;
6 is a construction explanatory diagram of the steel pipe pile construction method of FIG. 1; FIG.
FIG. 7 is a construction explanatory diagram of the steel pipe pile construction method of FIG. 1;
8 is a construction explanatory diagram of the steel pipe pile construction method of FIG. 1; FIG.
FIG. 9 is an explanatory diagram of a steel pipe pile construction method according to a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Steel pipe 2 ... Pumped muddy water pipe 2b ... Suction port 8 ... Rotary press fitting machine 10 ... Excavation blade

Claims (4)

In the steel pipe pile construction method to install a steel pipe in the ground and make it a pile body,
The wear member mounted within the lower end position of the steel pipe, by inserting the lifting mud pipe within said steel tube is penetrated through the center of the wear member, to separate the fried mud pipe so as not to rotate together with the steel pipe and the drilling member Placed in a state,
Applying a rotational force to the steel pipe, rotating the excavating member together with the steel pipe and excavating the inside of the steel pipe with the excavating member, sucking mud water containing excavated soil with the pumped muddy water pipe and discharging it from the steel pipe;
Steel pipe pile construction method characterized by   The steel pipe pile method according to claim 1, wherein the steel pipe is rotationally press-fitted into the ground by a rotary press-fitting machine.   The steel pipe pile construction method according to claim 1 or 2, wherein the excavation member is configured to be detachable from the steel pipe.   The steel pipe pile method according to any one of claims 1 to 3, wherein a pump is provided in the middle of the pumped muddy water pipe, and the muddy water is discharged upward through the pumped muddy water pipe by the operation of the pump.

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