KR101226236B1 - Phc pile with center hole - Google Patents

Abstract

PURPOSE: A hollow PHC(Pretensioned Spun High Strength Concrete) pile is provided to improve durability against pile driving and load bearing capacity corresponding to bending, axial force and shear force, and to reduce excavation costs when the inside destruction process is applied. CONSTITUTION: The hollow-type PHC pile(100) comprises a reinforcement steel material(10), a connection unit(20), and a fixation unit(30). The reinforcement steel material, a steel material elongated in a longitudinal direction, which arranged inside concrete in a predetermined distance to a circumferential direction has the inner end(11) exposed to the hollow(H) surface. The connection unit, a circular ring-shape metal material is combined with the reinforcement steel material to maintain the distance among the reinforcement steel materials. The fixation unit arranged outside the connection unit has a fixing hole for the inner steel material inserted from upward or downward.

Description

Hollow PHC Pile {PHC Pile with center hole}

The present invention relates to a hollow PHC pile, and more particularly, to a hollow PHC pile which can improve the load bearing capacity against durability and bending, axial force, and shear force, and can reduce the excavation cost when applying the fast drilling method. .

Representative piles conventionally used as a foundation by inserting deeply into the ground are steel pipe piles and PHC piles (Pre-tensioned Spun High Strength Concrete Pile). The steel pipe pile is a pile using a circular steel pipe having a hollow, excellent resistance to the driving, bending and shearing performance, but there is a problem in that it is expensive due to the characteristics of the steel, the PHC pile as shown in Figures 1 and 2 The inner steel (3), the spirally reinforced steel wire (4), and the high-strength concrete (2), which are subjected to tension, are placed in a circular mold (T), and formed using the centrifugal force generated when the mold (T) is rotated at high speed. As a prestressed hollow concrete pile (1) to be manufactured, it is cheaper than the steel pipe pile, but due to the material limitation of concrete, durability and bending and shearing performance of the driving are somewhat reduced.

In addition, as shown in Figure 3 in the quick dig method using the hollow (H) of the hollow concrete pile (1), the drilling bit (B) of the excavator (P) rotating at high speed is the hollow concrete pile ( 1) there is a problem of damaging the surface of the hollow (H), since the increase in the internal pressure due to the discharge soil discharged through the hollow (H) leads to the crack of the hollow concrete pile (1), the hollow concrete Excavation is performed by using a separate steel casing (not shown) having a larger diameter than the pile 1, and then the hollow concrete pile 1 is inserted into the hole made by the excavation. Although it is reduced, there is a problem that increases in terms of excavation cost.

Due to the peculiarities of the piles, expensive steel pipe piles cannot be used for structures in which bending moments and shear forces are large, but the steel pipe piles can bear loads with the PHC piles 1 based on the same diameter. Since there is no big difference in terms, there is a great need to partially reinforce the relatively inexpensive PHC pile 1 to improve the bending and shearing performance.

The present invention has been made to solve the above problems, the object is to improve the durability and durability of the load, the load bearing capacity for bending, axial force, shear force, and the structure is improved so that the excavation cost can be reduced when applying the quick break method To provide a hollow PHC pile.

In order to achieve the above object, the hollow PHC pile according to the present invention includes a hollow extending in the longitudinal direction and a hollow including a plurality of internal steels spaced at predetermined intervals along the circumferential direction as a member extending in the longitudinal direction. A PHC pile, comprising: reinforcing steels extending in a longitudinal direction, the plurality of reinforcing steels being spaced apart at predetermined intervals along a circumferential direction; An annular member, comprising: a connecting member coupled to the reinforcing steel to maintain a spacing between the reinforcing steels; It is provided so as to penetrate the connecting member in the vertical direction, the inner steel is inserted into the fixing hole which can be fixed position without moving in the horizontal direction.

Here, it is preferable that the reinforcing steel is a shaped steel having various cross-sectional shapes.

Here, it is preferable that the said inner end part is exposed to the said hollow surface of the said reinforcing steel material.

In this case, the reinforcing steel material preferably has an inner end extending to the hollow surface.

Here, it is preferable that the said connection member is a shape of a circular ring, and is arranged in multiple numbers along the longitudinal direction.

Here, the connecting member is in the shape of a circular ring, it is preferable to include a plurality of circular arc members each end is coupled to the reinforcing steel material adjacent to each other and having an arc-shaped plane shape.

Here, the connecting member and the reinforcing steel is disposed inside the inner steel, it is preferable that the fixing hole is formed on the outside of the connecting member.

Here, the fixing hole is preferably formed by the "U" -shaped fixing member that both ends are coupled to the connecting member.

Here, it is preferable that the said reinforcing steel materials are arrange | positioned at the upper end part and the lower end part, respectively.

Here, it is preferable that the said internal steel is wrapped by the reinforcement wire extended spirally along a longitudinal direction.

According to the present invention, since the steel material extending in the longitudinal direction includes a plurality of reinforcing steel spaced apart at predetermined intervals along the circumferential direction, compared to the conventional hollow concrete piles without the reinforcing steel In addition, the durability of driving, load bearing capacity for bending, axial force, and shear force are improved, and the excavation cost can be reduced when applying the quick break method.

1 is a horizontal cross-sectional view of a conventional hollow concrete pile.
2 is a cross-sectional view taken along the line AA of the conventional hollow concrete pile shown in FIG.
Figure 3 is a view for explaining the rapid drilling method for inserting the pile into the ground with the drill bit of the excavator is inserted into the hollow of the hollow concrete pile.
Figure 4 is a horizontal cross-sectional view of a hollow PHC pile which is an embodiment of the present invention.
5 is a cross-sectional view taken along line BB of the hollow PHC pile shown in FIG. 4.
6 is a cross-sectional view taken along line CC of the hollow PHC pile shown in FIG. 4.
7 is a perspective view for explaining the internal structure of the hollow PHC pile shown in FIG.
8 is a cross-sectional view illustrating a process in which the hollow PHC pile shown in FIG. 4 is molded in a mold.
9 is a sectional view taken along the line DD of the hollow PHC pile shown in FIG. 8.
10 is a cross-sectional view showing a state in which the hollow PHC pile shown in Figure 4 is inserted into the ground.
11 is a perspective view for explaining the internal structure of a hollow PHC pile according to another embodiment of the present invention.
12 is a horizontal sectional view of the hollow PHC pile shown in FIG. 11.
FIG. 13 is a horizontal sectional view of a rectangular pile manufactured using the internal structure shown in FIG. 7. FIG.
FIG. 14 is a horizontal sectional view of a square pile manufactured using the internal structure shown in FIG.
15 is a perspective view showing another embodiment for forming a fixing hole in the hollow PHC pile according to the present invention.
16 is a perspective view showing another embodiment for forming a fixing hole in the hollow PHC pile according to the present invention.

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

4 is a horizontal cross-sectional view of a hollow PHC pile according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line B-B of the hollow PHC pile shown in FIG. 4. 6 is a cross-sectional view taken along the line C-C of the hollow PHC pile shown in FIG.

4 to 6, the hollow PHC pile 100 according to a preferred embodiment of the present invention, the PHC pile of the concrete (2) material formed so that the hollow (H) extending in the longitudinal direction penetrates the inside ( As a pre-tensioned spun high strength concrete pile, it comprises a reinforcing steel 10, a connecting member 20, and a fixing member 30.

The reinforcing steel 10 is a steel extending in the longitudinal direction, as shown in Figure 4, in the state spaced apart at a predetermined interval along the circumferential direction, a plurality of are disposed inside the concrete (2).

As the reinforcing steel 10, section shape steels having various cross-sectional shapes are used. In the present embodiment, "a" shaped steels are used.

The reinforcing steel 10 is exposed to the surface of the hollow H by the inner end 11 extending to the surface of the hollow H of the concrete 2 material. In this embodiment, the inner end 11 of the reinforcing steel 10 is coplanar with the surface of the hollow H made of concrete 2.

As shown in FIG. 5, the reinforcing steel 10 is disposed in an upper region L1 which is an area starting at the upper end of the pile and a lower region L3 which is an area starting at the lower end of the pile. . Therefore, the reinforcing steel 10 is not disposed in the middle region L2 of the pile.

The connecting member 20 is a metal member having a circular ring shape, and is a member that is welded to the reinforcing steel 10 so as to maintain a gap between the reinforcing steels 10 at a predetermined interval.

The connecting member 20 includes a plurality of circular arc members 21 having an arc planar shape.

The arc members 21 have a center of the same circle as the center of the hollow H, and both sides of the reinforcing steel 10 in which both ends of the arc member 21 are adjacent to each other, as shown in FIG. 7. Each of the connecting members 20 has the shape of a circular ring by welding to each other.

The outer circumferential surface of the connecting member 20 is in contact with one of the inner circumferential surfaces of the reinforcing steel 10 that are substantially perpendicular to each other.

As shown in FIG. 5, the connecting member 20 is provided in plural and disposed in a state spaced apart by a predetermined interval along the longitudinal direction of the pile.

On the outside of the connecting member 20, a plurality of internal steels 3 are arranged as a metal rod member extending in the longitudinal direction and spaced apart at predetermined intervals along the circumferential direction.

The inner steels 3 are wrapped by reinforcing steel wires 4 extending spirally along the longitudinal direction as shown in FIG. 5.

A plurality of fixing members 30 are provided as “U” -shaped metal members, and are disposed outside the connecting member 20 in a state spaced apart at predetermined intervals along the circumferential direction.

Both ends of the fixing member 30 are welded to the outer circumferential surface of the connecting member 20 and fixed holes 31 penetrated in the vertical direction by the outer circumferential surfaces of the fixing member 30 and the connecting member 20. ) Is formed.

The internal steel material 3 is inserted into the fixing hole 31 from above or below, and the internal steel material 3 is inserted into the fixing hole 31 to be fixed in position without moving in the front, rear, left and right directions on a horizontal plane. In state, it is coupled to the connecting member 20.

 On the top and bottom surfaces of the hollow PHC pile 100, a tip plate 5, which is a disk-shaped metal member having a hollow H, is mounted, respectively, and an upper side surface of the hollow PHC pile 100 and Reinforcing bands 6, which are circular band-shaped metal members, are mounted on the lower side.

Hereinafter, an example of a method of manufacturing the hollow PHC pile 100 having the above-described configuration will be described.

First, as shown in FIG. 8, ① the inner steel material 3 is arranged in a round shape, and ⓐ the inner steel material 3 is moved upwards or downwards into a fixing hole 31 attached to the connection member 20. After insertion, the coil is wound around the inner steel material 3 with a spiral reinforcing steel wire 4. Then, ③ connect the tip plate 5 to the end of the reinforcing steel wire (4), ④ the metal structure (3, 4, 5) assembled as described above is placed in the mold (T), and the high-strength concrete ( 2) is put into the mold (T). Then, after closing the mold (T) and tensioning both ends of the inner steel (3) to give a tension force and then fixed, ⑥ by rotating the mold (T) as shown in Figure 9, by centrifugal force The injected high-strength concrete 2 has a predetermined thickness while being radially oriented and cures in this state. Finally, ⑦ by unwinding both ends of the inner steel (3) to introduce a prestress to the pile and demolding from the mold (T), the manufacture of the hollow PHC pile 100 is completed.

Thus completed hollow PHC pile 100 is to be inserted into the ground (G), as shown in Figure 10, through a short-break method or so-called anti-rotation method using the hollow (H) as shown in FIG. Can be.

Since the hollow PHC pile 100 having the above-described configuration includes reinforcing steels 10 which are arranged in a plurality of spaced apart at predetermined intervals along the circumferential direction as steels extending in the longitudinal direction, the reinforcing steels ( Compared with the conventional hollow concrete pile 1, which is not provided with 10), there is an advantage that the durability against driving and the load bearing capacity against bending, axial force, and shear force are improved.

In addition, the hollow PHC pile 100 is an annular member, a connecting member 20 coupled to the reinforcing steel 10 so as to maintain a gap between the reinforcing steels 10, and the connecting member 20. It is provided so as to penetrate in the up and down direction and the inner steel (3) is inserted into the fixing hole 31 can be fixed without moving in the horizontal direction, so that the reinforcement even at high speed of the mold (T) There is an advantage that can tightly bind the steel (10) and the internal steel (3).

In addition, since the hollow PHC pile 100 includes a connecting member 20 coupled to the reinforcing steel 10 so as to maintain a gap between the reinforcing steels 10 as an annular member, the quick breaking method In the hollow (H) can effectively resist the internal pressure due to the discharge soil discharged, there is an advantage that can prevent cracking and breakage of the concrete (2).

In addition, the hollow PHC pile 100 is provided to penetrate the connecting member 20 in the vertical direction, and the fixing hole 31 may be fixed without being moved in the horizontal direction by inserting the inner steel 3. Since the reinforcing steel 10 and the connecting member 20 are assembled, there is an advantage that the inner steel 3 can be easily inserted into the fixing hole 31 from above or below. .

In addition, since the hollow PHC pile 100 is a shaped steel having a variety of cross-sectional shapes, the reinforcing steel 10 is easy to purchase and process the reinforcing steel 10 that is ready-made, and the purchase price is low. There is this.

In addition, the hollow PHC pile 100 is exposed to the surface of the hollow (H) by extending the inner end 11 of the reinforcing steel 10 to the surface of the hollow (H) of the concrete (2) material Therefore, the concrete (2) adjacent to the surface of the hollow (H) is structurally reinforced, when performing the fast dig method using the pile itself as a casing, the drilling bit (B) of the excavator (P) to rotate at high speed The inner end 11 of the reinforcing steel 10 can directly defend the bar, there is an advantage that the surface concrete (2) of the hollow (H) is not easily broken.

In addition, the hollow PHC pile 100 is disposed in the upper and lower ends of the reinforcing steel 10, because the connecting member 20 is in the shape of a circular ring and is arranged in plural in the longitudinal direction of the pile. Compared to the case, it is possible to more effectively resist the internal pressure due to the discharge soil discharged through the hollow (H) in the quick dig method, there is an advantage that the load bearing capacity for the shear force is further improved.

In addition, since the hollow PHC pile 100 includes a plurality of arc members 21 coupled to the reinforcing steel 10 adjacent to both ends thereof and having an arc-shaped plane shape, the connection member 20 ) Is easy to manufacture in the shape of a circular ring, there is an advantage that it is easy to combine the connecting member 20 and the reinforcing steel (10) with each other.

And, the hollow PHC pile 100, the connecting member 20 and the reinforcing steel 10 is disposed inside the inner steel 3, the fixing hole 31 is the connecting member 20 Since the interference between the inner steel (3) and the reinforcing steel 10 and the connecting member 20 is minimized, the outer reinforcing wire (4) surrounds the outer steel (3) There is an advantage that the installation is easy to wrap, there is also an advantage that can be used as it is, the existing equipment and manufacturing method already prepared to manufacture the conventional hollow concrete pile (1).

In addition, the hollow PHC pile 100, the fixing hole 31 is formed by the "U" shaped fixing member 30, both ends of which are coupled to the connecting member 20, the connecting member 20 Without having to drill additional drill), there is an advantage that the fixing hole 31 can be easily formed by welding.

In addition, the hollow PHC pile 100, the reinforcing steel 10, the reinforcing steel 10 is not disposed in the middle region (L2) of the pile, the upper end portion (L1) and the lower end portion (L3) of the pile ), So that the internal pressure due to the discharged soil discharged from the fast digging method has the largest value at the upper end part L1 of the pile, and the vibration of the drilling bit B of the excavator P rotating at high speed is the lower end part. Considering the most severe in (L3), while using a small amount of reinforcing steel 10 there is an advantage that an effective structural reinforcement can be made.

On the other hand, Figure 12 is a horizontal cross-sectional view of a hollow PHC pile 200 which is another embodiment of the present invention. Since the configuration and action of the hollow PHC pile 200 is the same as the configuration and action of the hollow PHC pile 100 described above, only the differences will be described below.

The hollow PHC pile 200 uses a thick metal plate having a rectangular cross section as the reinforcing steel 110 instead of the reinforcing steel 10 which is a section steel having various cross-sectional shapes.

Since the reinforcing steel 110 may be formed thicker than the reinforcing steel 10, the reinforcing steel 110 may be manufactured to have greater rigidity than the reinforcing steel 10, and may be exposed to the surface of the hollow H. The area of the inner end 11 also has an advantage that can be increased than in the case of the reinforcing steel (10).

In the above embodiments, as shown in FIGS. 4 and 12, the outer circumferential surfaces of the piles 100 and 200 are manufactured to have a circular cross section, but as shown in FIGS. 13 and 14, the outer circumferential surfaces are rectangular cross sections. Of course, it may be manufactured to have.

In the above embodiments, the fixing hole 31 is formed in a closed curve shape by the fixing member 30, which is a “U” shaped metal member whose both ends are welded to the outer circumferential surface of the connecting member 20. Of course, only one end is welded to the outer circumferential surface of the connection member 20, so that a part of the fixing hole 31 having a hook shape is also possible.

In the above embodiments, the fixing hole 31 is formed by the fixing member 30 which is a separate "U" -shaped metal member, but does not use the fixing member 30, and the connection member ( Of course, it may also be formed by direct drilling in 20).

Meanwhile, FIG. 15 is an exploded perspective view illustrating a state in which the fixing member 130, which is another embodiment, is coupled to the arc member 21.

As shown in FIG. 15, the fixing member 130 is a member in which through holes 32 are formed at both ends of the “U” -shaped metal member.

A bolt member 22 is formed on the outer circumferential surface of the arc member 21 to protrude, and the bolt member 22 is screwed with the nut member 23 in a state where the bolt member 22 penetrates the through hole 32. The fixing member 130 is coupled to the outer circumferential surface of the arc member 21.

On the other hand, Figure 16 is an exploded perspective view showing a state in which the fixing member 230 is coupled to the arc member 21, which is another embodiment.

As shown in FIG. 16, the fixing member 230 is a “U” shaped metal member, and a through hole 32 is formed at one end thereof and is caught by an inner circumferential surface of the arc member 21 at the other end thereof. The "a" shaped locking groove 33 is formed to be formed.

The upper surface of the arc member 21 is provided with a bolt member 22 formed to protrude.

As the bolt member 22 is screwed with the nut member 23 in a state where the bolt member 22 penetrates the through hole 32, a lower surface of one end of the fixing member 230 is coupled to an upper surface of the arc member 21. The other end of the fixing member 230 is coupled to the upper surface of the arc member 21 by the locking groove 33.

The fixing members 130 and 230 are coupled to the arc member 21 by the bolt member 22 and the nut member 23 to form a fixing hole 31 for fixing the inner steel 3. As such, the manufacturing method of the hollow PHC pile 100 may be changed as follows.

First, ① the inner steel material (3) is arranged in a round shape, ② and wound around the inner steel material (3) with a spiral reinforcing wire 4 to produce a knitted net. Subsequently, ⓐ the connecting member 20 is inserted into the knitting net from above or below, and then the connecting member 20 is fixed to the knitting network using the fixing members 130 and 230. Subsequently, by performing the step ③ to step ⑦ of the manufacturing method described above, the manufacturing of the hollow PHC pile 100 is completed.

Therefore, when the fixing members 130 and 230 are used, the connecting member 20 is installed after fabrication of the knitted net, and thus, when the inner steel material 3 is wound with the spiral reinforcing wire 4, the connecting member ( 20) is not arranged, there is an advantage that the knitting network work more smoothly.

The technical scope of the present invention is not limited to the contents described in the above embodiments, and the equivalent structure modified or changed by those skilled in the art can be applied to the technical It is clear that the present invention does not depart from the scope of thought.

[Description of Reference Numerals]
100: hollow PHC pile 10: reinforcing steel
11 inner end 20 connecting member
21: arc member 22: bolt member
23: nut member 30: fixing member
31: fixing hole 32: through hole
33: hanging groove 2: concrete
3: internal steel 4: reinforcing wire
5: Tip plate 6: Reinforcement band
B: Drill bit G: Ground
H: Hollow P: Excavator
T: mold

Claims (10)

In the hollow PHC pile comprising a hollow extending in the longitudinal direction and a plurality of inner steel spaced apart at predetermined intervals along the circumferential direction as a member extending in the longitudinal direction,
A steel material extending in the longitudinal direction, the reinforcing steel being spaced apart at predetermined intervals along the circumferential direction;
An annular member, comprising: a connecting member coupled to the reinforcing steel to maintain a spacing between the reinforcing steels;
A fixing hole which is provided to penetrate the connecting member in a vertical direction and may be fixed in position without being moved in a horizontal direction by inserting the internal steel material;
/ RTI >
The reinforcing steel,
Hollow PHC pile, characterized in that the inner end is exposed to the hollow surface. The method of claim 1,
The reinforcing steel,
Hollow PHC pile, characterized in that the section steel having a variety of cross-sectional shape. delete The method of claim 1,
The reinforcing steel,
Hollow PHC pile, characterized in that the inner end extends to the hollow surface. The method of claim 1,
The connecting member,
The hollow PHC pile, which is in the shape of a circular ring and is arranged in plural along the longitudinal direction. The method of claim 1,
The connecting member,
Hollow PHC pile, characterized in that it comprises a circular ring, a plurality of circular arc members each of which is coupled to the reinforcing steel adjacent to each other and having an arcuate planar shape. The method of claim 1,
The connecting member and the reinforcing steel are disposed inside the inner steel,
Hollow PHC pile, characterized in that the fixing hole is formed on the outside of the connecting member. The method of claim 1,
The fixing hole,
Hollow PHC pile, characterized in that both ends are formed by a "U" shaped fixing member coupled to the connecting member. The method of claim 1,
The reinforcing steel,
Hollow PHC pile, characterized in that disposed on the upper end and the lower end, respectively. The method of claim 1,
The internal steel,
Hollow PHC pile, characterized in that it is wrapped by a reinforcing wire extending spirally along the longitudinal direction.

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