JPS5820823A - Pollution-free pile laying work - Google Patents

Abstract

PURPOSE:To prevent the occurrence of vibration and noise when laying a pile by a method in which an outer shell tube fixed with a screw auger is turned for excavation, a pile inside the outer shell tube is reached to a support layer, and while opening a conical cap at the tip of the outer shell tube, a grout for recovering the circumferential frictional force of the pile is injected into the outer shell tube. CONSTITUTION:At the same time as an outer shell steel tube 2 is erected, a custom-made pile 4 is inserted into the outer shell steel tube 2, and then a grout 6 for recovering the circumferential frictional force of the pile is packed into the space 5. By turning and penetrating the outer shell steel tube 2, excavated soil is discharged through a screw auger 3 until the support layer is reached. Then, a conical cap 1, devided to several parts and capable of opening and shutting, is stepwise opened, the outer shell tube 2 is pulled up, and the custom-made pile 4 and grout 6 are settled together.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pollution-free method for embedding ready-made piles in a predetermined support layer without vibration or noise.

Conventional methods of driving ready-made piles using hammers, etc., generate noise and vibration, which is considered an important pollution problem, and various non-pollution methods for burying piles have been proposed and put into practical use, but they have many problems. There is. In other words, a typical non-polluting construction method using ready-made piles is to drill a pile hole in the soil with an earth auger in advance, fill the pile hole with 1 ruq, and then sink the pile. There are two methods, such as the Nakahori method, in which an earth auger is inserted into the hollow part of the pile and the pile is sunk while drilling, and the double auger method, in which an earth auger is inserted into the hollow part of the pile, and the outer casing with the auger is sunk at the same time. Each has the following drawbacks. In other words, the cement milk construction method may cause the hole wall to collapse during the cement milk filling work or the sinking work of the company pile, and the pile may rise high, making it impossible to obtain the specified supporting capacity. ■
The overflowing cement milk slurry is not treated as industrial waste, and its disposal requires a great deal of cost and labor, and there is even a risk of secondary pollution occurring due to problems in the treatment of cement milk slurry. ■ Pile misalignment due to the difference between the hole wall diameter and the pile diameter may occur, leading to a change in the foundation design or the installation of additional piles. In addition, the medium excavation method may damage the inner surface of the pile depending on the method used when inserting the screw auger into the pile.
Even during burying, the screw auger may scrape the wall surface inside the pile body, which may cause damage to the pile itself. ■Forcibly inserting piles in i-type soils may create internal pressure and cause a self-destruction. ■The friction cutter attached to the tip of the pile creates a gap between the soil wall and the antibody, and the frictional force on the pile circumferential surface is extremely reduced. The double auger method requires enormous amounts of equipment and requires a great deal of labor and expense. ■Construction speed is slow. ■Construction costs will increase. There are various problems such as: The present invention solves these problems and provides an innovative pile embedding method that allows ready-made piles to be driven completely without vibration or noise.

That is, insert the pile circumferential friction force restoring injection material and the ready-made pile into the outer shell tube with a screw auger, rotate and press fit the outer shell tube until it reaches the specified support layer, and then pull up the outer shell tube while opening the tip shoe. This is a method in which the pile circumferential friction force restoring injection material is poured at the same time as the ready-made pile is dropped, and after the injection material hardens, the pile circumferential surface friction force and tip support force can be improved.

Embodiments of the present invention shown in the drawings will be described below.

In FIG. 1, reference numeral 1 denotes a cone-shaped tip shoe which is divided into several parts and can be opened and closed, and is attached to the tip of an outer shell tube 2 having a screw auger 3 fixed to its outer periphery.

A removable drive device 7 is attached to the upper end of the outer shell tube 2 and rotates the outer shell tube 2. In order to bury a pile in a device with such a configuration, first, the outer shell steel pipe 2 is erected, and at the same time, the ready-made pile 4 is inserted into the outer shell pipe 2, and the ready-made pile 4 is inserted between the outer shell pipe 2 and the ready-made pile 4. The resulting void 5 is filled with an injection material 6 for restoring the frictional force on the pile circumferential surface.

Figure 2 shows this situation. The outer shell pipe 2 built at a specified position is fitted with a drive device 7, rotated and press-fitted to discharge soil through the screw auger 3 and reach a predetermined support layer. Thereafter, the openable and closable conical front 1 divided into several parts is opened, the outer shell tube 2 is pulled up, and the ready-made pile 4 and the injection material 6 for restoring the frictional force on the pile circumferential surface are dropped and deposited. Pile peripheral surface frictional force restoring injection material 6#i When the outer shell tube 2 is pulled up while rotating normally, the liquid level will drop, so additional injections are made as needed to reach the field surface.

An example of a method for opening the conical front 1 which can be opened and closed is shown in FIG.

The segmented conical front 1 is fastened to the outer shell tube 2 at several locations with pins 1o. The front end is processed into a conical jig 13. Automatic Hatsuka 11 is a cone-shaped jig] Automatic Hatsuka 1L grabs blind 3
The wire 12 is added to the Fi wire 12 when winding the winch on the ground and sinking the arm shell pipe 2 through the antibiotic cavity.
#i Since it is being pulled by the winch, the automatic hammer 11 is tightened, and due to the weight of the ready-made pile inserted into the outer shell pipe 2 and the injection material for restoring the frictional force on the pile circumference, the 1-segmented conical front 1#'i cannot be opened. do not have. After reaching a predetermined support layer, when the wire 12 is loosened, the automatic hatch 11 opens and it comes off the cone-shaped jig 13, and the automatic hatch opens the lid rfCft and is recovered to the ground by winding the winch. In this state, the split conical shoe 1
Since the pile is not gripped, when the outer shell tube 2 is pulled up while rotating in the normal direction, the split conical front 1 gradually opens and the ready-made pile is sunk.

By burying piles in this way, this method successfully solved the problems seen in the Nyori-cement ξruque method, medium excavation method, double auger method, etc. In other words, (1) the outer shell pipe reliably reaches the specified support layer, so the pile does not rise too high and the specified supporting force is obtained. ■The injection material for restoring the friction force on the pile circumferential surface is injected as needed and is injected all the way to the field surface, so there is no surplus injection material and there is no risk of secondary pollution. ■Construction accuracy is determined by the installation accuracy of the outer shell pipe.High-precision construction is possible. ■Since prefabricated piles are well protected by outer shell pipes, self-destruction will not occur and the piles will not be damaged during construction.

■ Restoration of pile circumferential friction force A strong hardened layer is formed between the hole wall and the pile (by the injection material), and sufficient pile circumferential friction force is developed.

■The equipment is not large-scale, and the IIA construction speed is low, making the construction economical.As mentioned above, the present invention is a complete construction method that can overcome the deficiencies of various conventional non-polluting construction methods and exhibit excellent effects. This is a pollution-free pile burial method.

The injection material 6 for restoring the frictional force on the pile circumferential surface may be of a composition that greatly enhances the tip bearing capacity, or it may be possible to use a combination of the two types of compounding agent, the root hardening solution and the injection material for restoring the frictional force on the pile circumferential surface. May be used. If the outer shell tube 2 is reversed and pulled up, the earth and sand around the pile will be consolidated, and a higher friction force on the pile circumferential surface can be expected. Furthermore, if the supporting ground is very deep, or if the loading conditions make the design uneconomical, this construction method can be applied at any depth to create a friction pile, making it possible to create an extremely economical design. It has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway longitudinal sectional front view of a pile applied to the present invention. FIGS. 2 to 7 are longitudinal sectional front views sequentially showing the pile embedding process, and FIG. 8 is a vertical sectional view of the conical front. 1... Conical front that can be opened and closed, 2... Outer shell tube,
3--screw auger, 4--ready-made pile, 5-- air gap, 6--pile circumferential surface friction force restoring injection material, 7--- drive device, 10 ---Pin, 11---Automatic, 12--Wire,
13... Conical jig □. Patent applicant: Asahi Kasei Industries, Ltd. Figure 1 Figure 2 Figure 3 Figure 4r11I Figure 5 Figure 6

Claims (1)

[Claims] A conical front 1 which can be opened and closed divided into two or more parts is attached to the tip of an outer shell tube 2 to which a screw auger 3 is fixed on the outside.
The void created between the sVc pile and the ready-made pile 4 is filled with the injection material 6 for restoring the frictional force of the pile, and the outer shell tube 2 is rotated and press-fitted to reach a predetermined support layer. While opening, pull up the outer shell tube 2 and pour in the injection material 6 for restoring the friction force on the pile circumferential surface.