KR20120050582A - Hybrid pile - Google Patents

Abstract

PURPOSE: A hybrid pile is provided to reduce construction costs by replacing a part of steel pile pipes to PHC piles. CONSTITUTION: A hybrid pile(1) comprises steel pipe piles, at least one PHC(Pretensioned Spun High Strength Concrete) pile(10), and a connecting unit(30). The steel pipe piles are provided as a leading pile in ground pile-driving. At least one PHC pile is connected with the steel pipe pile as a post pile. The connecting unit connects the steel pipe pile and the PHC pile.

Description

Hybrid file {HYBRID PILE}

The present invention relates to a pile used for pile driving, and more particularly, using a PHC pile (Pretensioned spun High strength Concrete Pile) in addition to a steel pipe pile when there is a thick gravel layer before reaching the underground rock layer. It relates to a hybrid pile that allows the gravel layer to penetrate.

In general, in the case of erecting a building or structure, the foundation work is reinforced to support the structure of the upper part according to the condition of the ground or the load of the structure.

In this case, when the ground in contact with the structure, such as hard ground, has rigidity sufficient to support it, the foundation work can be carried out directly on the hard ground. However, in the case of the soft ground which is not so, the foundation work is carried out after the designation work is carried out to fix the pile or improve the ground so that ground settlement does not occur.

The pile foundation is one of the basic types employed when the depth of the support layer is deep, and by constructing an upper structure on the pile driven into the support layer, it is possible to stably support the weight of the structure in the support layer. Concrete piles, steel pipe piles, and composite piles are used as pile foundations.

On the other hand, in the construction of large-scale heavy equipment such as plant equipment, the pile depth is up to the underground rock layer. In this case, the type of file used is a steel pipe pile or a PHC file (Pretensioned spun High strength Concrete Pile).

The steel pipe pile is a file that can be easily embedded with excellent strength and small external force, and is generally used for designation of soft ground.

On the other hand, recently, PHC piles manufactured by centrifugal force and autoclave curing have been widely used. The PHC pile is a high-strength pile with a pretensioning method, which can withstand a great celebration, introduces prestress into concrete, and is excellent in impact resistance and excellent in tensile stress.

Comparing the above two piles, in the case of steel pipe piles, the pile material is uniform, so that the resistance to load is uniform over the entire length of the pile, and in particular, the bending force and the shear force are excellent. However, the material cost of steel pipe pile is two to three times higher than that of concrete pile.

On the other hand, in the case of PHC pile, which is a kind of concrete pile, its tip end is closed and the tip bearing capacity is high, and the material cost is lower than that of the steel pipe pile, thereby reducing the construction cost. However, workability (penetration) has a disadvantage in comparison with steel pipe piles.

In particular, as shown in Figure 1, when there is a thick gravel layer between the rock layer in the surface of the PHC pile is difficult to penetrate through the gravel layer, the pile is broken when driving.

Therefore, under the above ground conditions, steel pipe piles are used instead of PHC piles. In this case, construction costs increase.

The present invention has been proposed to solve the above-mentioned conventional problems, and an object thereof is to provide a hybrid pile configured to facilitate at least gravel layer construction in order to maximize the advantages of the PHC pile and the steel pipe pile.

The present invention as a technical aspect for achieving the above object,

Steel pipe file provided as a preceding file at the time of underground driving of the file;

At least one PHC file provided as a trailing file connected to the steel pipe file; And,

Connecting means for connecting the steel pipe pile and the PHC file;

It provides a hybrid pile configured to facilitate construction of gravel layer comprising a.

At this time, preferably, the PHC file may include a welded joint made of steel for connecting and welding.

In addition, the PHC pile may further include a reinforcing band.

And, the connection means may comprise a steel material provided at least in part.

Preferably, the connecting means may be chamfered to reinforce the welding strength, and may be sandwiched between the PHC pile and the steel pipe pile and welded integrally in the circumferential direction.

More preferably, the steel pipe pile may include a bent portion in which at least part of the contact portion with the connecting means is bent.

According to the hybrid pile of the present invention, even when a thick gravel layer is present in the middle layer of the surface and the rock, PHC piles having a low material cost can be used in addition to the steel pipe pile, thereby providing an excellent effect of ultimately securing the economical cost of construction. do.

In addition, the present invention, by using a connecting means for connecting the upper PHC pile and the lower steel pipe pile or by bending the lower steel pipe pile end, to solve the problem caused by the contact surface difference between the two pile, PHC pile has a sufficient bearing capacity It provides an excellent advantage that can be obtained.

In addition, the present invention provides an excellent effect that can strengthen the bonding strength of the upper and lower piles by chamfering the joint portion to reinforce the welding strength of the connecting means.

1 is a conceptual diagram showing a lipid with an intermediate gravel layer.
2 is a schematic view showing the configuration of the hybrid file of the present invention.
3 is a perspective view showing a state in which the hybrid file of the present invention is coupled.
4 is an exploded perspective view showing the components of the present invention hybrid pile.
Figure 5 is a detailed view of the connecting means of the present invention, Figure 5a is a sectional view of the connecting means, Figure 5b is a plan view of the connecting means, Figure 5c is a perspective view of the connecting means.
6 is a cross-sectional view showing a state in which the PHC file and the steel pipe pile is combined in the present invention.
7 is a cross-sectional view showing a state in which the PHC file and the steel pipe pile subjected to the bending process are combined in the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic diagram showing the configuration of the hybrid file 1 of the present invention. 3 is a perspective view showing a state in which the hybrid file 1 of the present invention is coupled, and FIG. 4 is an exploded perspective view showing the components of the hybrid file 1 of the present invention. 5a to 5b are detailed views of the connecting means 30 of the present invention. 6 is a cross-sectional view showing a state in which the PHC pile 10 and the steel pipe pile 20 is coupled in the present invention, Figure 7 shows that the contact portion 30 of the steel pipe pile 20 in the present invention is bent. It is a cross section.

First, as shown in FIG. 2, the present invention provides a steel pipe file 20 provided as a preceding file at the time of underground driving of a file and at least one PHC file 10 provided as a trailing file connected to the steel pipe file 20. And a connecting means 30 connecting the steel pipe pile 20 and the PHC pile 10 to provide a hybrid pile 1 configured to facilitate at least gravel layer construction.

That is, the hybrid file 1 of the present invention, the lower portion is made of a steel pipe pile 20 and the upper portion is made of a PHC pile 10, the steel pipe pile 20 and PHC file 10 is made of a structure to be described later It is integrated through the connecting means (30).

As described above, piles having different types of lower and upper piles are referred to as hybrid piles (composite piles).

First, the lower steel pipe pile 20, which is a preceding file, may be a cylindrical body portion 22 made of steel, and may include a front end portion 24 of the lower portion of the body portion.

In addition, as shown in FIG. 3, the upper PHC pile 10, which is a trailing pile, may be composed of a body portion 11 made of concrete and both ends and a hollow portion 19 therein.

In this case, the PHC pile 10 may include a connecting part 14 and a welding joint 14 made of steel to weld the joint.

In addition, the PHC pile may further include a reinforcing band 16.

That is, as shown in Figure 6, the end of the PHC pile 10 may be integrally provided with a joint iron plate 12, which is a donut-shaped support disc made of steel of a predetermined thickness from the pile manufacturing. In addition, a welding groove may be formed at an edge of the joint iron plate 12 so that a welding joint portion 14 capable of welding may be integrally formed.

In addition, a reinforcing band 16 may be further provided to surround a part of the body of the PHC pile 10 above the joint iron plate 12.

As such, the present invention, the one or more PHC pile 10 is connected to the upper portion of the steel pipe pile 20, the superior strength of the steel pipe pile 20 first passes through the middle gravel layer PHC of the upper steel pipe pile 20 The pile 10 also has the advantage of being able to easily pass through the gravel layer.

At this time, the tip portion 24 of the steel pipe pile 20 may be formed in a conical shape, in this case it can be easier to pass through the gravel layer to ensure the tip support force when directly driving the steel pipe pile 20 to the support layer.

Accordingly, even when there is a gravel layer, it is not driven by a pile composed of a relatively expensive steel pipe pile 20, but is driven by a hybrid pile 1 composed of a PHC pile 10 and a steel pipe pile 20, Provides excellent effects to reduce construction costs.

On the other hand, even if the length of the file is long, it can be connected to the PHC file 10 using the connecting means 30 again on the PHC file 10. By doing so, the hybrid file 1 composed of only the bottom file as the steel pipe file 20 and the rest of the PHC file 10 can be provided.

As described above, as the length of the hybrid pile 1 increases, the effect of the present invention increases. That is, in this case, most of the hybrid file 1 may be composed of the PHC file 10, the construction cost is significantly reduced compared to the use of only the steel pipe pile 20 has the advantage that the economic effect is very excellent.

On the other hand, according to the conventional method of connecting the pile when the file connection, the welding groove formed in the end of the steel pipe pile 20 and the welding groove formed in the steel joint plate 12 integrally installed with the pile at one end of the PHC pile (10). Using butt weld the upper and lower piles.

However, in such a case, a difference in contact surface occurs due to a difference in thickness between the steel pipe pile 20 and the PHC pile 10. That is, since only a part of the lower end of the PHC pile 10 contacts the upper end of the steel pipe pile 20, sufficient support force of the PHC pile 10 may not be secured.

In addition, the cross-sectional area of the steel pipe pile 20 is relatively small compared to the cross-sectional area of the PHC pile 10, there is a problem that the deformation of the welded joint of the PHC pile 10 and the upper end of the steel pipe pile 20 occurs.

Therefore, the present invention uses the connecting means 30 to solve this problem. In this case, the connecting means 30 may include a steel material provided at least in part.

In addition, the connecting means 30 can be chamfered on the joint 34 with the lower pile, so as to reinforce the welding strength, sandwiched between the PHC pile 10 and the steel pipe pile 20, integral in the circumferential direction Can be welded.

Next, in FIGS. 4 to 7, the connecting plate 32 is shown as an embodiment of the connecting means 30. As shown in Figure 5a to 5b, the connecting plate 32 is a cylindrical annular shape of the interior 36 may be made of a hollow portion (36).

In addition, the joint plate 32 according to the present invention is a means for securing a sufficient bearing capacity of the PHC pile (10). Therefore, preferably, the connecting plate 32 may be made of steel, the thickness of the ring may be formed to be the same as or thicker than the thickness of the PHC pile (10).

And, as shown in Figure 6, the connecting plate 32 is sandwiched between the lower steel pipe pile 20 and the upper PHC pile 10, the welding portion 40 for welding the upper and lower portions in the circumferential direction You can use the method of connecting the upper and lower files by forming a.

That is, the welding part is provided with a welding portion 42b for welding the circumferential part by installing the connecting joint plate 32 on the upper end of the lower steel pipe pile 20, and the lower end of the upper PHC pile 10 on the connecting joint plate 32. It may be composed of a welding portion (42a) for welding the peripheral portion of the.

At this time, the joint portion 34 of the edge of the connection plate 32 may be chamfered to a predetermined size level (for example, 10mm level) in the upper and lower portions in the circumferential direction. By doing so, there is an advantage in that a welding groove is formed to secure sufficient strength during welding.

Meanwhile, as shown in FIG. 7, the steel pipe pile 20 may include a bent portion 26 in which at least a portion of the contact portion with the connecting means 30 is bent.

As such, the lower steel pipe pile 20 may increase the contact force with the connecting joint plate 32 by forming the bent portion 26 by bending the contact portion with the connecting joint plate 32 therein. By doing so, the PHC pile 10 can secure sufficient bearing capacity than when only the joint plate 32 is used.

While the invention has been shown and described in connection with specific embodiments so far, it will be appreciated that the invention can be variously modified and varied without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

1: hybrid file 10: PHC file
11 body portion 12 joint iron plate
14: welded joint 16: reinforcement band
18: PC steel wire 20: Steel pipe pile
22: body 24: tip
26: bend portion 30: connecting means
32: connection plate 34: connection
40: weld

Claims (6)

A steel pipe file 20 provided as a preceding file at the time of underground driving of the file;
One or more PHC files provided as a trailing file connected with the steel pipe file 20 (
10); And,
Connecting means 30 for connecting the steel pipe pile 20 and the PHC pile 10;
Hybrid file configured to facilitate construction of gravel layer comprising a. The method of claim 1,
The PHC pile (10) is a hybrid pile, characterized in that it comprises a welded joint (14) made of steel to weld the joint means and the connection (30). The method of claim 1,
Hybrid file, characterized in that the PHC pile (10) further comprises a reinforcing band (16). The method of claim 1,
The connecting means (30) is a hybrid file, characterized in that it comprises a steel at least in part. The method according to claim 1 or 4,
The connecting means 30 is chamfered to reinforce the welding strength,
The hybrid pile, characterized in that between the PHC pile (10) and the steel pipe pile (20), integrally welded in the circumferential direction. 5. The method according to any one of claims 1 to 4,
The steel pipe pile (20) is a hybrid file, characterized in that it comprises a bent portion (26) at least part of the contact portion with the connection means (30).

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