JPS62296009A - Piling work - Google Patents

Abstract

PURPOSE:To penetrate a custom-made pile into the ground with low noise and low vibration by a method in which after the ground is excavated to a given depth, a casing is penetrated into the ground, and then a custom-made pile is inserted into the casing. CONSTITUTION:A casing 2 is penetrated into the ground as excavation is proceeded by a spiral auger 1 to a given depth while confirming the verticality of the casing 2. Cement milk 3 for foot protection is injected from the tip of the auger 1. The auger 1 is pulled up from the casing 2, the casing 2 is raised by about 30cm, and concrete pile 4 is inserted into the casing 2 and lowered to a given depth. The lowering is temporarily stopped by a temporary stopper 5, the pile 4 is settled into the casing 2 at a time, and the casing 2 is slowly pulled up while pressing the head of the pile 4 by the tip of the auger 1. Piling work excellent in operability, safety, and economy can thus be performed.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Object of the Invention) This invention relates to a pile driving method employed as a civil engineering work to reinforce the bearing capacity of the ground, and is particularly concerned with a pile driving method that is particularly low noise and low. The aim is to provide a new construction method that embeds prefabricated piles into the soil using vibration.

(Prior Art) In civil engineering work in urban areas, noise pollution or vibration pollution generated during the work process, as well as disposal of earth and sand, waste liquid, etc., are discussed as major social problems.

For this reason, it has recently become difficult to adopt the conventional method of driving prefabricated piles into the soil using a diesel hammer or vibrating hammer, and methods such as the reverse circulation method, donut organ method, or hollow impact method are now being used. Developed and put into practical use.

However, the reverse circulation method and the donut organic method do not solve the problem of disposal of soil cement mixed with human water, earth and sand, or bentonite solution, and the hollow impact method does not solve the problem. However, there are disadvantages in that it is not suitable for thick prefabricated piles such as concrete piles, and solving these problems will be a major challenge in the future.

In view of the above-mentioned situation, this invention has been developed and researched diligently, and as a result, it has finally been published as a book.The details of its structure are as explained below. It is something.

(Structure of the Invention) As can be clearly understood from the representative embodiment of the present invention shown in the drawings, which shows the construction process as a model, the pile driving method of the present invention has the following features. It consists of the construction process.

[First Step] The casing 2 is pressed into the soil as the spiral auger 1 rotates and excavates, and the casing 2 is advanced to a predetermined depth in the soil while checking its verticality.

When the spiral auger 1 rotates and excavates, consideration is given to ejecting compressed air from the tip of the connecting head to smooth the discharge of the connecting soil and improve the connecting efficiency. In the figure, 11 indicates a drive device, and 21 indicates a press-fitting device for the casing 2.

[Second process] Cement milk for root hardening 3 from the tip of spiral auger 1
At the same time, while rotating the spiral auger 1, the dicing 2 is completely pulled up from inside the dicing 2, and then the casing 2 is raised approximately 30 cm.

The injection of the cement milk 3 for root hardening is carried out by the jetting part used for jetting the compressed air as explained in the first step, and the injection amount depends on the volume of the hole formed by the casing 2 and the amount of filling. This is determined based on a value that is approximately equal to the difference between the volume occupied by the external shape of the prefabricated pile 4 and the volume occupied by the external shape of the prefabricated pile 4.

By finally raising the casing 2 by approximately 30 cm in this step, the workability of lifting the casing 2 in the fourth step can be confirmed in advance.

In the figure, 22 is a hoisting device for the casing 2.

[Third step] Concrete or! inside dicing 2! A prefabricated pile 4 such as an A pipe pile or an H steel column is lifted up, gently inserted into the dicing 2 and lowered to a predetermined depth, and then temporarily secured to the prefabricated pile 4 using a temporary fixing device 5 supported on the upper end of the dicing 2. After stopping the descent of the pre-fabricated pile 4 and releasing the column head of the pre-fabricated pile 4 from the lifting machine 6, the pre-fabricated pile 4 is diced 2 at once by operating the temporary fixing device 5 mentioned above.
sink inside.

At the stage of transitioning from the second process to this third process, the driving device 11 portion with the spiral auger 1 attached is rotated so as to be removed from the pile core, so as not to interfere with the insertion work of the prefabricated pile 4. Preparations are made, and then this third step is carried out.

As the lifting machine 6 for the existing pile 4, it is usually sufficient to have an auxiliary crane, and the capital of the existing pile 4 is grasped and lifted using a clamp, chuck, etc., as appropriate.

1. The third process diagram (A) in FIG. 1 shows one aspect of the stage in which the prefabricated pile 4 is lifted up by the lifting machine 6, and then inserted into the casing 2 and lowered. 5
This shows a state in which the prefabricated pile 4 is temporarily stopped by using the.

This temporary fixing tool 5 is a center adjustment fitting 5 that adjusts the prefabricated pile 4 to be located in the center with respect to the casing 2, as shown in the second national affairs map and the vertical cross-sectional view in FIG. 3, for example.
1.51... It is constructed by being incorporated into one of the piles, and is rotatable in a screw-type manner, and when the downward force due to the weight of the existing pile 4 is applied, the end engagement part 52 rotates so as to abut against the side surface of the prefabricated pile 4 and extend its stroke, and as a result, the peripheral wall of the prefabricated pile 4 is brought into pressure contact with the other center adjustment fittings 51 and 51 and this meshing portion 52. As a result, the descent of the pre-formed pile 4 can be temporarily stopped.Conversely, this temporary stop can be achieved by pushing down the handle part to shorten the stroke of the engaging part 52 and releasing the pressed state. The prefabricated pile 4 is constructed so that it naturally descends due to its own weight.

[Fourth Step] The capital of the prefabricated pile 4 settled in the dicing 2 is pressed down with the tip of the spiral auger 1, and then the casing 2 is gently pulled up.

The spiral auger 1 is attached to the prefabricated pile 4 in the third step.
In order to insert the pile, the pile has been pivoted so as to be removed from the pile core, and is then returned to the pile core and lowered until its digging S head hits the capital of the existing pile 4, and this process begins.

After the casing 2 is pulled up, if the cement milk 3 is too low below the ground surface, additional cement milk 3 may be replenished around the existing pile 4 as needed.

As described above, the pile driving method of the present invention is completed by smoothly performing the first to fourth steps.

(Operation and Effect) The pile driving method of the present invention realized through the steps described above has the following characteristics.

First of all, at a given depth Ii! 1 is completed, the casing 2 is not pulled up together with the spiral auger 1 as in the conventional method, but the work process is to insert the prefabricated pile 4 with only the casing 2 left in place, which prevents collapse. Damage and collapse of the surrounding wall of the pile hole can occur even in sites with highly volatile geological formations or large geological formations with flowing water! One of its unique features is that it allows for smooth work to be carried out without worrying about problems.

Therefore, there is no need to fill the entire pile hole with soil cement or to pump high-pressure water or air to prevent the wall around the pile hole from collapsing, as was the case with previous construction methods. In addition to being extremely economical and highly workable as various equipment required for this process can be omitted, what should be noted is the problem of post-treatment of the large amount of soil cement or water that is rejected when inserting prefabricated piles. This means that there will be no pollution at all, and no pollution will be caused.

The second feature is that because the casing 2 that protects the surrounding wall of the pile hole is used repeatedly, there is no need for uneconomical materials such as soil cement, water, or sheet pile, which used to be disposable at each site. This means that it can be made even more economical.

The third feature is that the casing 2 completely protects the surrounding wall of the pile hole, and any type of prefabricated pile 4 can be inserted, making pile driving extremely flexible in terms of design management. .

The fourth feature is that each process does not generate enough noise or photography to become a source of pollution, making it suitable for piling construction in urban areas.

The fifth feature is that improvements have been made in the handling of pre-fabricated piles 4, such as the construction process using temporary fasteners 5, which are superior in terms of workability, safety, and economy compared to other conventional pile driving methods. This means that it will be possible to drive piles in a manner that is easy to achieve.

etc., can be enumerated as features of this invention.

As mentioned above, the pile driving method of the present invention, due to its characteristic process, can carry out extremely advantageous pile driving construction compared to the previous pile driving method. Not only will this benefit civil engineering contractors, but it will also have a significant impact on society, and is expected to receive high praise from all quarters.

[Brief explanation of drawings]

The drawings are based on representative examples of this invention, and Figure 1 is a process diagram showing the construction process in terms of the central aspects of each process, and Figure 2 is a process diagram showing the construction process adopted in the construction process. The plan view, Figure 3, showing the state of use of the temporary fastener is as follows:
It is a longitudinal sectional view of the same. 1...Spiral auger, 11...Spiral auger, 2
...Casing, 21...Press-fitting device, 22...
The hoisting device, 3... Soil cement, 4... Ready-made pile, 5... Temporary fastener, 51... The center adjustment device, 52... The meshing part, 6... Lifting hole , 61・
... facing, 7... ground. Figure 1 No. 1-14

Claims (1)

[Claims] A pile driving method in which prefabricated piles are buried underground in the following first to fourth steps. First step: As the spiral auger excavates, the casing is pressed into the soil, and the casing is advanced to a predetermined depth in the soil while checking its verticality. 2nd step Inject the cement milk for root hardening from the tip of the spiral auger and completely pull it up from inside the casing while rotating the spiral auger, then lift the casing to about 30cm.
Raise it back and forth. 3rd step: Lift a pre-fabricated pile such as a concrete pile, steel pipe pile, or H-steel pile into the casing, insert it gently into the casing, lower it to a predetermined depth, and temporarily secure it with a temporary fixing device supported on the upper end of the casing. After stopping the descent of the prefabricated pile and releasing the prefabricated pile capital from the lifting machine, the prefabricated pile is sunk into the casing at once by operating the previous temporary fixing device. Fourth step: After pressing the column head of the prefabricated pile housed in the casing with the tip of the spiral auger, the casing is gently pulled up.