KR20130015036A

KR20130015036A - The bit for protecting bending of phc piles

Info

Publication number: KR20130015036A
Application number: KR1020110076813A
Authority: KR
Inventors: 박천호
Original assignee: 한남기초(주)
Priority date: 2011-08-02
Filing date: 2011-08-02
Publication date: 2013-02-13

Abstract

PURPOSE: A bit for preventing the flexure of a PHC pile is provided to prevent the flexure such that the pile bumped against obstacles underground is pushed out, and vertically and accurately drive the pile into a desired position when the pile is directly driven into a weak ground. CONSTITUTION: A bit(1) for preventing the flexure of a PHC pile includes a circle fixing plate(6), a transverse plate(3), and a longitudinal plate(4). The transverse plate is transversely placed to be vertically erected on the lower surface of the fixing plate. The upper surface of the transverse plate is fixed to the fixing plate, and a coupling groove(5') is inwardly equipped in the center of the lower surface of the transverse plate. The longitudinal plate is longitudinally placed to be vertically erected on the lower surface of the fixing plate so that the longitudinal plate intersects with the transverse plate. The upper surface of the longitudinal plate is fixed to the lower surface of the fixing plate by coupling the coupling groove(5') of the transverse plate with the coupling groove inwardly equipped in the center of the upper surface of the longitudinal plate.

Description

The H. C. Pile Bending Prevention Bits {The bit for protecting bending of PHC piles}

The present invention relates to a file bending prevention bit, and in more detail, the PHC file is pushed out by an obstacle located in the ground in the process of directly hitting the soft ground by driving a PHC file having a file bending prevention bit attached to a lower end thereof. In order to improve the stability of the PHC pile by going straight so as to prevent the occurrence of this, the ground pressure per unit area is reduced, and relates to a file bending prevention bit that can improve the mobility of the pile by reducing the progress resistance.

In general, when constructing various construction civil engineering structures such as buildings and bridges, in order to reinforce the weak ground, steel pipe piles are laid in the ground, and the ends of embedded steel pipe piles are closed and reinforcing structures are installed on the head (top). Concrete structures

To support concrete civil engineering / building structures.

At present, due to the rise of high and large structures and the rise of land prices and environmental problems, various special constructions, which have not been seen in the past, are increasing.

In addition, as the construction and coastal works on the soft ground, which have been neglected as the location of the conventional construction structures, have become more active, the awareness of the safety of the structure has been changed with the introduction of the seismic design method, the piles used for the reinforcement of the foundation structure have a deeper penetration amount. And great support.

Accordingly, the PHC pile (PRETENSIONED SPUN HIGH STRENGTH CONCRETE PILES) has been put into practical use as a countermeasure against the high strength of the pretensioned concrete piles (hereinafter referred to as PC piles).

The PHC pile is specified in the Korean industry standard "KS F4306 pretensioned centrifugal high strength concrete pile", which has a high strength of concrete exceeding 78.5MPa (800kg / cm2) and currently uses PHC pile at most sites.

PHC pile has high strength concrete design compared to the conventional PC pile, significantly improved design support, high resistance to impact, less damage, economical construction design is possible.

On the other hand, the driving pile method is divided into a direct hit method and a direct hit method after pre-excavation. When planting a PHC pile with a depth of 20 to 30 m in a soft ground, the direct ground method is mainly used because the surrounding ground is compacted to increase the bearing capacity.

However, if the lower end hits an obstacle such as a rock in the ground in the process of directly hitting the PHC pile on the soft ground by anti-taking, the PHC pile does not proceed vertically but slightly bends to one side, causing bending.

The reason why the warpage phenomenon occurs as described above is because the PHC pile is formed in a tubular shape, so that the part hitting or contacting the rock is not the center portion but the edge portion of the PHC pile. There is a problem that occurs.

That is, since the bottom edge of the PHC file acts as a bit, the center of the hollow part of the PHC file does not act as a centripetal point, and when it hits gravel, clay layers, rocks, etc., it easily deviates from one side, causing bending of the PHC file.

Therefore, in the process of connecting the PHC pile 20 to 30m deep, warpage is easily caused by obstacles in the ground.

In order to solve the above problems, an object of the present invention is to prevent the bending phenomenon to be pushed to one side while hitting an obstacle located in the ground in the process of directly hitting the PHC file on the soft ground and to precisely drill and hit the desired position in a vertical line. It is done.

As a means for solving the above problems, the present invention is pushed to one side when hitting an obstacle located in the ground in the process of directly attaching the file bending prevention bit to the lower end of the PHC pile, the bending phenomenon does not occur in the vertical line desired Provides a file warp prevention bit that can hit the position.

As described above, the present invention is attached to the lower end of the pile pipe file including the PHC pile to prevent the bending of the pile to be drilled through the various obstacles in the ground when placed in the ground by the ride to improve the stability in the vertical line In addition, the ground pressure per unit area acting on the PHC pile can be reduced.

In addition, the present invention can reduce the energy cost according to the operation of the cruiser by speeding up the progress of the PHC pile in the direct stroke process, it is possible to shorten the air according to the construction.

1 is an exploded perspective view showing a bit for preventing the file bending of the present invention.
Figure 2 is a perspective view showing the bit of the present invention file bending prevention bit.
Figure 3a, b is a perspective view showing another embodiment of the present invention file bending prevention bit.
Figure 4 is a perspective view showing a state in which the present invention file bending prevention bit is attached to the PHC file.
5 is a cross-sectional view showing an embodiment of the present invention file bending prevention bit.

In order to achieve the above objects and effects the present invention will be described in detail by the accompanying drawings as follows.

1 is an exploded perspective view showing a bit for preventing the file bending of the present invention, Figure 2 is a combined perspective view showing a bit for preventing the file bending of the present invention.

The present invention bending prevention bit (1) is attached to the lower end of the PHC pile (2) directly driven into the ground speed when the bottom surface of the fixing plate (6) so as not to be bent to one side and proceed in a vertical line when hitting an obstacle including a rock The horizontal plate (3) and the vertical plate (4) is formed in a structure coupled to cross.

The pile bending prevention bit (1) is a circular fixed plate (6), and the horizontal plate (3) which is vertically erected on the bottom surface of the fixing plate (6) is located in the horizontal direction, the upper surface is welded and fixed to the fixing plate (6), Coupling grooves 5 and 5 'are formed in the center thereof.

In addition, the bottom surface of the fixing plate 6, the vertical plate (4) is positioned vertically to cross the horizontal plate 3 in the vertical direction, and the coupling groove (5) is formed in the middle of the upper surface of the horizontal plate (3) The upper surface is welded and fixed to the bottom of the fixing plate 6 in a state of being fitted with the coupling groove (5 ') of.

Then, the horizontal plate 3 and the vertical plate 4 are crosswise coupled to the bottom of the fixing plate 6 to form a cross (1) for preventing the file bending.

3A and 3B are perspective views showing another embodiment of the present invention file bending prevention bit, wherein both sides of the horizontal plate 3 and the vertical plate 4 are inclined surface 7 toward the center of the bottom surface joined at the edges. Minimize the ground plane with obstacles, including ground and rock.

Therefore, in the present invention, when the PHC file 2 itself is used, the bit part is not positioned at the edge, but is positioned at the bottom center of the PHC file 2 to form a reference, regardless of obstacles in the direct stroke process. Can be installed correctly.

That is, the present invention file bending prevention bit (1) forms a center point at the bottom center of the PHC pile (2), by minimizing the ground plane so that it can be accurately installed in a vertical line regardless of obstacles located in the ground.

FIG. 4 is a perspective view showing a state in which a file warping bit of the present invention is attached to a PHC file, and FIG. 5 is a cross-sectional view showing an embodiment of the file warping bit of the present invention.

The present invention file bending prevention bit (1) is formed integrally by welding the upper surface of the fixing plate (6) to the lower end of the PHC pile (2), and then directly hit the PHC pile (2) by driving, the file bending prevention bit ( Even if the bottom surface of the vertical plate 4 and the horizontal plate 3 of 1) is grounded to the ground and bumped against the rock, the center of the pile bending prevention bit (1) is in the center of the PHC pile (2). Therefore, the force generated during the impact is not distributed, but flocked to the center of the bottom surface of the bit (1) for the prevention of pile bending, and easily penetrates the obstacles including the gravel layer, the clay layer, the rock, and proceeds easily.

1: Bit for preventing file warping 2: PHC file
3: horizontal plate 4: vertical plate
5, 5 ': coupling groove 6: fixing plate
7: slope

Claims

The lower end of the PHC pile (1) directly driven into the ground speed piles the horizontal and vertical plates (3, 4) on the fixed plate (6) so as to penetrate the obstacles including the rock and proceed in a vertical line easily H-C file bending prevention bit, characterized in that the bending prevention bit (1) is attached.

2. The pile bending prevention bit (1) according to claim 1, further comprising: a fixing plate (6) having an upper surface attached to a lower end of the PHC pile (2);
A horizontal plate (3) formed on the bottom of the fixing plate (6), the upper surface being welded in a vertical position and vertically welded;
The bottom surface of the fixing plate 6 is positioned vertically to be intersected with the horizontal plate (3) to be fixed by welding, the vertically positioned in the longitudinal direction in the center of the upper surface engaging grooves (5) is formed in the horizontal plate (3) H-piece file bending prevention bit, characterized in that formed by the coupling groove (5 ') and the vertical plate (4) fitted.

3. The H-C file warpage prevention bit according to claim 2, wherein both sides of the transverse plate (3) and the longitudinal plate (4) form an inclined surface (7) toward the bottom surface joined at the edge.