JPH09195274A - Driving method for precast pile and guide pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method and a pile in which a precast pile can be built in the ground by use of a guide pile with hardly causing vibration and noise, preliminary excavation is dispensed with to eliminate the necessity of discharged earth disposal, whereby the labor can be saved, and setting can be also precisely and easily performed with good working property. SOLUTION: In a driving method for precast pile, a guide pile 1 is pushed into a ground 6 while it is rotated in the direction of advancing its spiral edge 3b downward. After the guide pile 1 reaches a setting depth, an H section pile 4 is inserted through the opening 2c of the guide pile 1. When the guide pile 1 is then rotated in the direction reverse to the above, the screwing between the pipe part 2 and excavating part 3 of the guide pile 1 is released, and the guide pipe 1 is vertically separated. The separated pipe part 2 is lifted and pulled out from the ground 6, whereby the driving of the H section pile 4 to a ground 5 is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of driving ready-made piles used as earth stoppers and foundations in civil engineering work on the ground with almost no vibration or noise. About guide piles.

[0002]

2. Description of the Related Art Used as a main pile for earth retaining walls to be installed along with root cutting when burying pipes and building foundations, and as a pile foundation for firmly holding ground structures on the ground. Conventional H-steel piles and other ready-made piles have been placed on the ground.
A method of driving from the ground to the depth of insertion with a hammer or a method of digging a hole from the ground to a predetermined depth with an earth auger (pre-digging), inserting ready-made piles into the hole, and then driving to the depth of insertion. The method was commonly used.
Among these conventional methods, all of the methods that are performed by driving generate a large amount of vibration and noise during the driving, so that the work place is limited. On the other hand, the method of digging a hole, inserting it, and then driving it in can work with less vibration and noise, but it takes time because of the pre-digging process, and also the disposal of soil after digging Was needed. Further, regarding the accuracy of the position and the posture of the ready-made pile, if the accuracy of each work of drilling and inserting the H-steel pile is not good, high accuracy cannot be ensured and it is difficult to arrange them correctly.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve the above-mentioned problems and to install a ready-made pile in the ground by using a guide pile so that vibration and noise can be almost eliminated. It is an object of the present invention to provide a ready-made pile driving method and a guide pile used for the method, which does not require pre-digging, does not require soil removal processing, requires no labor, and can be inserted accurately, accurately and easily and has good workability.

[0004]

[Means for Solving the Problems] The structure of the present invention which has solved the above problems is as follows: 1) A pipe main body having a hollow portion into which ready-made piles can be inserted, and the bottom of the ready-made piles can be inserted inward, and the outer periphery is for underground propulsion. Prepare a guide pile with a structure in which a short cylindrical bottomed part with a spiral blade is screwed together with a screw part in the same winding direction as the spiral blade, and the spiral pile faces downward. While pushing in the direction of rotation, propel the ground with a spiral blade and push it to the required depth of penetration,
Insert the ready-made pile from the pipe body opening in the upper part of the guide pile to the lowermost part, and then rotate the guide pile in the opposite direction to remove the screw of the pipe body and the excavation part and separate it,
A ready-made pile driving method in which only the separated pipe main body is pulled out from the ground to leave the ready-made pile and the excavation part in the ground 2) The H-steel pile is used as the ready-made pile in 1) The ready-made pile driving method described in 3) ) Same as a spiral blade: a pipe body with a hollow part into which ready-made piles can be inserted and a bottomed short cylindrical excavation part with a spiral blade for underground propulsion on the outer periphery where the bottom of the ready-made pile can be inserted inside The guide pile has a structure in which the threaded portions in the winding direction are screwed together to be combined.

[0005]

In the prefabricated pile driving method of the present invention, first, at a predetermined position on the ground where the prefabricated pile is driven, the guide pile is rotated in the rotational direction in which the spiral blade moves downward and pushed into the ground by the spiral blade. The guide pile is guided by the spiral blade and screwed, and is pushed to the depth of rooting of the ready-made pile with almost no vibration or noise. When the rooting depth is reached, the pushing of the guide pile is stopped, the ready-made pile is inserted from the opening on the upper side of the pipe body of the guide pile, and the ready-made pile is lowered until the bottom end reaches the inside of the excavation part at the bottom of the guide pile. In this way, if the ready-made pile can be inserted deep into the ground with the guide pile interposed, the guide pile is rotated in the direction opposite to the pushing direction. In this opposite direction of rotation, since the excavation part of the guide pile is hard to rotate due to the large resistance in the ground, only the pipe main body rotates, the pipe body and the excavation part are unscrewed, and the guide pile is Separate up and down. Separate the pipe body completely from the ground. When the pipe body is pulled out, the ready-made piles and the ground around them are settled, and the ready-made piles are fixed to the ground, and the driving is completed. The other separated excavation part of the guide pile remains in the ground.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In addition to H steel piles, wood piles, PC piles, RC piles, steel pipe piles, etc. may be used as ready-made piles to be cast by the construction method of the present invention. You may use the one suitable for the application such as the foundation.

The guide pile used in the construction method of the present invention has a thin tube shape so that a void is not easily generated between the ready-made pile and the ground when the pipe body is pulled out. In addition, sufficient strength can be obtained even if the wall thickness is thin. It is preferably made of steel pipe, but other materials having sufficient strength may be used. Further, it is desirable that the excavation part, which is left on the ground together with the ready-made piles, has a shape in which the bottom is covered so that the sand and sand do not enter the inside of the guide pile, and the length is shortened as much as possible to reduce waste. The pair of threaded portions provided on the pipe body and the excavation portion of the guide pile may be provided with a screw or a female screw in any direction as long as it has the same winding direction as the spiral blade on the outer periphery of the excavation portion.

The pipe body of the guide pile extracted from the ground by the method of the present invention may be reused by screwing another excavated portion together and reusing it. Also, after pulling out the pipe body,
If there is a gap between the ready-made pile and the ground, inject cement milk, grout, earth and sand, etc. into the gap to fix it more reliably.

[0009]

An embodiment of the present invention will be described with reference to the drawings.
The present embodiment is an example in which H steel piles are used as ready-made products. FIG. 1 is an explanatory view showing a ready-made pile driving method of the embodiment, and FIG. 2 is a side view showing a guide pile used in the embodiment.

The guide pile 1 used in the prefabricated pile driving method of the present embodiment is a pipe portion made of a steel pipe having a hollow portion 2d into which the H steel pile 4 can be inserted and having a length substantially equal to the length of the H steel pile 4. 2 and a short cylindrical shape having the same diameter as the pipe portion 2, the inside of which is provided with a space into which the lowermost portion of the H steel pile 4 can be inserted, and the outer periphery of which is provided with a spiral blade 3b for propelling underground. The steel excavation part 3 and the pipe part 2 on the excavation part 3
Is formed on the lower end and the upper end of the screw 2a and the male screw 3a so as to be combined with each other. A bottom plate 3c is provided at the lowermost end of the excavation portion 3 of the guide pile 1 to prevent dirt and sand from entering the inside of the guide pile 1. On the other hand, at the bottom of the pipe section 2 of the guide pile 1,
Press-fitting device for pushing the guide pile 1 into the ground 5 (not shown)
Alternatively, a working hole 2b used for connection with a drawing device (not shown) for drawing the pipe portion 2 after inserting the H steel pile 4 is provided. The relationship between the winding direction of the internal thread 2a and the external thread 3a of the combination portion of the guide pile 1 and the direction of the spiral blade 3b is such that when the entire guide pile 1 is rotated in the rotational direction in which the spiral blade 3b advances downward. The winding direction is set to be the same as that of the spiral blade 3b, in which the 2a and the male screw 3a are tightened and loosen when they are rotated in the opposite directions.

In the ready-made pile driving method of this embodiment, first, the guide pile 1 is arranged at a predetermined position for driving the H steel pile 4 on the ground 6, and the spiral blade 3b is moved downward by a press-fitting device. It is pushed into the ground 6 while rotating (see FIG. 1 (a)).
The guide pile 1 travels in the ground while being guided by the spiral blade 3b while being screwed, and reaches the rooting depth of the H steel pile 4 with almost no vibration or noise. After reaching the rooting depth,
Stop the press-fitting device and separate it from the guide pile 1. After that, the H steel pile 4 is inserted from the opening 2c on the ground 6 side of the guide pile 1 while being suspended by a crane or the like, and the bottom end of the H steel pile 4 reaches the bottom plate 3c of the excavation part 3 of the guide pile 1. Insert (see FIGS. 1 (d) and 1 (e)). After installing the H steel pile 4 on the ground 5 in this way, when the guide pile 1 is rotated in the opposite direction by the pulling device, the pipe portion 2 of the guide pile 1 and the excavation portion 3 are unscrewed, and the guide pile 1 is removed. Separate into upper and lower parts (see FIG. 1 (f)). The separated pipe portion 2 is pulled up while being rotated by the pulling device as it is and completely pulled out from the ground 6 (see FIG. 1 (g)). By pulling out the pipe portion 2, the H steel pile 4 can be fixed to the surrounding ground 5 and securely fixed, and the driving is completed. The other dug portion 3 of the guide pile 1 which is separated is left in the ground as it is.

[0012]

According to the present invention, by adopting the above-mentioned method, ready-made piles can be driven into the ground with almost no vibration or noise, the surrounding environment is not adversely affected, and the working environment is not selected. And the guide pile is driven by only screwing, it is easy to maintain the accuracy of the position and posture, and it can be easily and correctly placed by inserting the ready-made piles, the workability is good, and the work of pre-digging and earth removal is saved. The cost is also saved, and the pipe part of the guide pile can be reused, which is economical and the work efficiency is high.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a ready-made pile driving method according to an embodiment.

FIG. 2 is a side view showing a guide pile used in the embodiment.

[Explanation of symbols]

 1 Guide pile 2 Pipe part 2a Female screw 2b Working hole 2c Opening 2d Hollow part 3 Excavation part 3a Male screw 3b Helical blade 3c Bottom plate 4H Steel pile 4a Working hole 5 Ground 6 Ground

Claims (3)

[Claims] 1. A pipe main body having a hollow portion into which a prefabricated pile can be inserted, and a short cylindrical excavation portion with a bottom, into which a lowermost portion of the prefabricated pile can be inserted, and a spiral blade for underground propulsion provided on the outer periphery. Prepare a guide pile with a structure that is screwed together with the screw part of the same winding direction as the spiral blade, and propel the ground with the spiral blade while rotating the guide pile in the rotation direction in which the spiral blade moves downward, After pushing in to the required depth of insertion, insert the ready-made pile from the pipe body opening at the top of the guide pile to the bottom, and then rotate the guide pile in the opposite direction to screw the pipe body and the excavation part. A ready-made pile driving method that removes and separates, and only the separated pipe main body is pulled out from the ground to leave the ready-made pile and excavation part in the ground. 2. The prefabricated pile driving method according to claim 1, wherein an H steel pile is used as the prefabricated pile. 3. A pipe main body having a hollow portion into which a ready-made pile can be inserted, and a short cylindrical excavation part with a bottom, into which the bottom of the ready-made pile can be inserted, and a spiral blade for underground propulsion provided on the outer periphery. A guide pile that has a structure in which the spiral blade and the threaded portion in the same winding direction are screwed together to form a combination.