KR20100124165A

KR20100124165A - Shoe for phc pile

Info

Publication number: KR20100124165A
Application number: KR1020090043276A
Authority: KR
Inventors: 곽희경
Original assignee: (주)삼오기초건설; 곽희경
Priority date: 2009-05-18
Filing date: 2009-05-18
Publication date: 2010-11-26

Abstract

PURPOSE: A shoe for a driven PHC(Prestressed Spun High Strength Concrete) pile is provide to improve the stability in driving a PHC pile into the ground by pushing out underground obstacles around the driven PHC pile. CONSTITUTION: A shoe(10) for a driven PHC pile(1b) comprises a shoe body(11) and an attachment unit. The shoe body, which is attached to the bottom of the PHC pile, is formed in the shape of funnel in order to reduce the grounding force and driving resistance of the driven PHC pile and ensure stable advancing of the PHC pile. The attachment unit attaches the shoe body to the bottom of the PHC pile.

Description

Shoo for shouta PI file {SHOE FOR PHC PILE}

The present invention relates to a shoe (Shoe) attached to the lower end of the PHC pile that is driven on the soft ground, and attaches the shoe to the lower end of the PHC pile being driven, the underground obstacle to the radially outer side of the PHC pile when the PHC pile is driven The present invention relates to a shoe for driving PHC piles that can improve driving stability of the PHC pile by reducing the running pressure by reducing the running resistance by improving the running stability of the PHC pile.

Generally, soft ground is a case in which the ground itself cannot tolerate the load from the upper structure or the predicted settlement exceeds the allowable value. Soft ground, loose sandy soil, organic soil, etc. belong to the soft clay, If roads, bridges, buildings, etc. are placed on the ground composed of organic soil, the sedimentation of shear surface is excessive, and there is a lack of support, causing safety problems. Recently, garbage has become an important environmental problem. Plans are also being made to use the ground as a basis for roads and buildings, and excessive ground subsidence and lack of support are expected in such grounds.

Among the countermeasures for the stability and settlement problems of structures based on such soft ground, the method of reaching the fill layer, which is commonly used, is the steel pipe pile, PHC pile, and PC pile RC, which are produced in advance at the factory. The pile is constructed by a method such as a type method (hit, vibration) or a buried method, and the pile is continuously blown after the blow according to the condition of the ground, and after being hit properly, the pile is projected to the upper part of the plan ground. Is appropriately cut, the bottom reinforcing bar in the horizontal direction on top, and the foundation concrete is poured to stably support the structure (building) by the piled and poured concrete.

There are two types of piles for driving: steel piles and concrete piles (hereinafter referred to as 'PHC piles'). Prestressed Spun High Strength Concrete Piles are provided. There are general concrete piles made by pouring concrete, high-strength piles and cylindrical steel piles which are placed inside the tension muscle called Ulbon, poured concrete, and forcedly tensioned to introduce stress and rapidly cure under stress conditions.

Recently, high strength piles are used which are much higher than ordinary concrete piles, and ordinary concrete piles are gradually being used except for lightweight construction.

In order to navigate the pile as described above in the ground, driving equipment such as a drop hammer, a steam hammer, a diesel pile hammer and a vibration pile driver are used, and the pile hitting the ground first by the driving equipment is a solid ground. If it does not reach by, connect another file on the embedded file and construct it.

At this time, the upper pile connected to the lower pile is flat so that the two piles are connected to the surface contact so that the driving pressure of the driving equipment is evenly transmitted to the lower pile.

Such a structure of the conventional file is registered utility model No. 20-0224734 "reinforcement band for concrete files" (registration date: March 09, 2001), registered utility model No. 20-0277683 "connection structure of the soft ground reinforcement file "(Registration date: 05/27/2002)," Joint cap of PA file, "registered utility model No. 258871, and JP 10-0687471," Bolt type joint shoe of PA file "(Registration date: 2007. 02.21). When looking at the file (Pile) published in the prior document as described above, it is characterized by a simple connection structure for linking two files at the top and bottom of the file.

On the other hand, since the contact surface of the steel pipe is very narrow in connecting the two piles, the method of integrating the diameter of the lower pile and the diameter of the upper pile by welding the connected portion is common.

However, when the PHC pile driven by the above-mentioned navigation equipment encounters obstacles such as rocks or rubble buried in the ground in the process of being placed into the ground, the pile does not get stuck well in the ground despite the impact of the navigation equipment.

As a result, the driving equipment for longer periods of time and the PHC pile must be priced with a stronger force, which increases the operating cost of the machinery and causes air delays.

The present invention has been invented to compensate for the problems caused by the conventional piloting operation as described above, an object of the present invention is to obstacles encountered at the lower end of the PHC pile when placing the PHC pile in the ground by the impact of the driving equipment. It is to provide a shoe for the driving PHC pile that can be easily overcome and allow the PHC pile to proceed underground.

The problem of shoe for PHC pile in accordance with the object of the present invention,

In the PHC pile driven under the ground by the driving equipment,

A lowering force and running resistance of the PHC pile being driven, guides the vehicle to stably run in the driving direction of the PHC pile, and attaches means for attaching a shoe body having a funnel shape attached to the lower end of the PHC pile to the lower end of the PHC pile. It can be implemented by providing.

The shoe according to the present invention pushes various obstacles (building waste or rocks and others) buried or buried in the ground by funnel-shaped inclined surfaces when the PHC pile is poured into the ground by the driving equipment to the radially outer side of the PHC pile. Since the traveling, the running stability of the pile can be improved, and the mobility of the PHC pile is improved by lowering the ground pressure per unit area acting on the PHC pile.

Therefore, the running speed of the PHC pile is fast, the energy cost according to the operation of the driving equipment can be reduced, and the air according to construction can be shortened.

Hereinafter, with reference to the accompanying drawings for the PHC pile shoe according to the present invention will be described in detail.

1 is a sectional view of the main part of a shoe for a PHC pile illustrating the first embodiment according to the present invention, Figure 1b is a sectional view of the main part showing a construction example according to the shoe for a PHC pile of the present invention, Figure 2a is a An exploded perspective view illustrating a shoe for a PHC pile illustrating a second embodiment according to the present invention, and FIG. 2B is a bottom view of the shoe for the PHC pile shown in FIG. 2A, and FIGS. 3A and 3B are a third embodiment according to the present invention. It is a principal part perspective view which showed the shoe for PHC piles which illustrated the example, and the principal part sectional drawing by the construction of a pile.

As shown in Figures 1a to 2b, the shoe 10 according to the present invention is attached to attach the shoe body 11 and the shoe body 11 made of a funnel shape having an inclined surface to the PHC pile 1b. The means 13 is comprised. The PHC file 1b is a file currently in use.

The shoe 10 is composed of a connecting plate 13a attached to the distal end of the PHC pile 1b, and an inclined surface 12 having a funnel shape in order to improve the running property of the PHC pile during driving operation. It comprises an attachment means 13 for attaching to the PHC pile (1b).

As an example of employing the attachment means 13, as shown in Figs. 1A and 1B, the joints are welded so as to connect the upper surface of the shoe to the reinforcement plate 3 (provided in manufacturing the PHC pile) of the PHC pile, or to Figs. 2A and 2B. As shown, the through hole parallel to the axis of the screw hole 2 in the connecting plate 13a so that the bolt 17 is fastened to the screw hole 2 of the reinforcing plate 3 attached to the distal end of the PHC pile 1b. After providing (16), align the axis of the through hole (16) of the connecting plate (13a) with the axis of the screw hole (2), and then fasten the bolt (17) to the screw hole (2) to attach the shoe (10). can do.

The outer diameter of the connecting plate 13a is formed in the same diameter as the outer diameter of the PHC pile 1b, and the funnel-shaped inclined surface 12 is provided in the lower side.

As described above, when the shoe 10 is attached to the PHC pile 1b by the bolt 17 and then hits the upper end of the PHC pile 1b using the driving device, the traction force according to the driving of the pile is lowered and the pile Running resistance is improved while lowering the resistance of the driving.

That is, the obstacle is pushed outward in the radial direction of the PHC pile 1b by the inclined surface 12 of the funnel-shaped shoe body 11 during the process of the PHC pile 1b proceeding to the ground during the driving of the PHC pile. The resistance of the pile 1b as the vehicle travels is low.

Therefore, the length of the PHC file 1b traveling when the PHC file 1b is driven once can travel longer than the conventional PHC file traveling length.

On the other hand, while the PHC pile 1b is placed in the ground, the longer the casting length of the PHC pile 1b is, the more the resistance due to the ground acting on the circumferential surface of the PHC pile is gradually increased. The distance traveled becomes shorter. This is because the ground resistance becomes larger as the surface area grounded on the circumferential surface of the pile increases.

3A and 3B illustrate a shoe structure that is supplemented such that the ground retracting force applied to the circumferential surface of the PHC file does not increase even if the depth of the PHC file in which the PHC file is driven into the ground increases.

That is, as shown in the figure, by configuring the outer diameter (D2) of the connecting plate (13a) larger than the outer diameter (D1) of the PHC pile (1b), the grounding resistance of the PHC pile running only acts on the edge of the connecting plate, It does not work on the circumferential surface of the PHC pile.

In other words, since the outer diameter D2 of the connecting plate 13a is made larger than the outer diameter D1 of the PHC pile 1b, the ground pressure according to the driving on the PHC pile 1b driven into the ground is mostly connected to the connecting plate 13a. It acts only on the edge of, and hardly on the circumference of the PHC file.

Therefore, the grounding force of the PHC pile 1b to be driven or the repulsion resistance due to driving acts at a substantially constant level regardless of the depth of casting of the PHC pile 1b, so the grounding pressure or the resistance of the repulsion resistance is the circumferential surface of the PHC pile 1b. Since the ground resistance is less than the ground resistance acting on the PHC pile, the PHC pile is able to hit the PHC pile with relatively low force.

Reference numeral 14 denotes a weld bead welded between the shoe 10 and the reinforcement plate 3 to attach the shoe to the reinforcement plate 3 of the PHC pile.

As described above, in the present invention, the PHC pile is placed into the ground using the driving device. By attaching a shoe to the lower end of the PHC pile, the PHC pile is driven while the inclined surface of the funnel shape pushes the obstacle radially outward of the PHC pile. Therefore, the ground pressure of the PHC pile per unit area is reduced, which improves the mobility of the pile.

Figure 1a is a perspective view of the main portion excerpts illustrating the shoe for the PHTA pile exemplifying the first embodiment according to the present invention,

1B is a sectional view showing the main parts of a construction example of the shoe for PHC pile shown in FIG. 1A;

Figure 2a is a perspective view of the main portion excerpts illustrating the shoe for the PHTA pile exemplifying a second embodiment according to the present invention,

Figure 2b is a bottom view of the shoe for driving PHC pile shown in Figure 1a

Figure 3a is a perspective view of the main portion excerpts illustrating an application example of the shoe for PHC pile exemplifying a third embodiment according to the present invention,

FIG. 3B is a sectional view showing the principal parts of an example of attachment and construction of the shoe for the PHC pile shown in FIG. 3A. FIG.

1b: PHC file

2: screw hole 3: gusset

10: Shoo 11: Shoo body

12: inclined surface 13: attachment means

13a: connecting plate 14: welded part (welding bead)

16: through hole 17: bolt

Claims

In the PHC pile driven under the ground by the driving equipment,

The shoe body 11 and the shoe body 11 having a funnel shape attached to the lower end of the PHC pile to lower the traction and running resistance of the PHC pile 1b to be driven and to stably run in the driving direction of the PHC pile are PHC piles. Shoe for PHC pile, characterized in that consisting of the attachment means 13 for attaching to the lower end of (1b).

The method of claim 1,

The attachment means screws the through hole 16 and the connecting plate 13a having the through hole 16 formed in parallel with the axis of the screw hole 2 of the reinforcing plate 3 provided at the lower end of the PHC pile 1b. A shoe for driving PHC piles, which is fastened to the hole 2 by bolts 17 and attached to the PHC pile 1b.

The method of claim 2,

Shoe for the PHC pile, characterized in that the outer diameter (D2) of the connecting plate (13a) is formed larger than the outer diameter (D1) of the PHC pile (1b).