KR20040110387A - Structure and method reinforcing the unbreakable head of high-stress concrete pile - Google Patents

Abstract

PURPOSE: A reinforcement method for an unbreakable head of a high-strength concrete pile is provided to stabilize structurally by securing the strength of a high-strength concrete pile(PHC) by un-breaking, to exclude the use of filled concrete by securing strength and relaxation by heightening the adhesive strength of a reinforcing bar using a coupler, and to execute an eco-friendly and economical construction work by removing wastes and preventing the loss of piles. CONSTITUTION: The reinforcement method for an unbreakable head of a high-strength concrete pile(3) comprises the steps of perforating a pile fitting hole on the ground for constructing a building structure, filling up the pile fitting hole with cement milk grouting liquid, then fixing a high-strength concrete pile(PHC)(3) to the pile fitting hole, coupling many reinforcing bars(8) to a pile cap(4) coupled to a head of the high-strength concrete pile(PHC)(3) exposed to the appointed height, fixing the reinforcing bars(8) with many tie hoops(12), forming a screw part on the lower end of the reinforcing bar(8) and coupling to a screw hole of a pile cap(4) together with a coupler(10), locating a finishing plate on the front of the high-strength concrete pile(PHC)(3), then placing and curing concrete to complete a floor slab.

Description

Structural and method reinforcing the unbreakable head of high-stress concrete pile}

The present invention, in the concrete piles in the foundation ground of civil engineering or building structures, in particular, using the concrete pile as a high-strength concrete pile (PHC), without breaking the head of the high-strength concrete pile (PHC) It also enables effective reinforcement, stable pile strength, no need for stuffed concrete, fast work, shorten the air and reduce labor cost, and high-strength concrete that is eco-friendly because no waste is generated. The present invention relates to a method for reinforcing crushed heads of piles and a reinforcing structure thereof.

In general, in the case of pier or alternating foundation of civil engineering, building structure or bridge, when the support layer is deep, steel pipe piles or concrete piles are built into the support layer to support the load of the structure, and then concrete floor slab is formed on the piles. After that the various structures will be constructed on top.

In the case of the steel pipe piles, which are mainly used in civil engineering construction sites or bridge construction sites, the steel pipe piles are introduced into the destination panel by using the rudder to drive the pile tip.

In the case of concrete piles, when the work should be done in the city center, such as a building structure, by inserting the concrete piles in the drilled state with the pile insertion holes in the destination panel using the pile drilling equipment, noise and vibration are not generated. It is.

In the case of the concrete piles, as shown in FIG. 7, the concrete piles 101 are inserted into the ground 100 to a certain depth, and the heads of the concrete piles 101 exposed to the upper portion of the ground 100 are crushed to piles. With the steel wire 102 exposed inside, the concrete for the floor slab is to be poured,

Before pouring concrete for the foundation floor, filling the filling soil 103 to a certain height in the inside of the pile pile 101, to fill the concrete to a certain depth inside the tip of the concrete pile 101, the external force In addition to providing a more stable support force from (bending moment and shear force), the exposed steel wire is being constructed to increase the coupling force between the pile and the foundation.

However, the construction structure as described above has a problem that the concrete piles have a problem of deterioration of the bond with the lower and enlarged foundations or the front foundations according to the uneven settlement of the ground, and the decline of the coupling force between the pile and the foundation slab caused by such uneven settlements is tilted. As a factor that directly causes cracking or cracking, the coupling structure between the tip of the pile and the bottom slab should be improved to prevent the deterioration of the bonding force caused by the shear deformation.

Therefore, in the related art, the head of the concrete pile is crushed to couple the various fastening members to the exposed steel wire, thereby making reinforcement coupling. However, in the head crushing process, longitudinal cracking of the concrete pile occurs, thereby causing mechanical strength of the pile. In addition to significantly lowering the pressure, the corrosion of the steel wire inside the pile through the crack is threatening structural safety.

Therefore, in the related art, despite the need to combine the foundation surface using a concrete pile, there is a problem that the reinforcement coupling using the concrete pile is hardly made due to the problem caused by the longitudinal crack as described above.

In addition, the head reinforcement method of the concrete pile, such as the method described above, because it is necessary to fill the stuffed concrete after removing the foreign matter filled in the pile by cement milk grouting, the work is very cumbersome, secure the strength of the concrete pile by longitudinal cracking It is very difficult, and even though the binding force of the reinforcing bar is reduced, the head of the crushed pile is classified as waste, which is a factor of environmental pollution, and there is a very uneconomical problem due to the material loss of the concrete pile generated during the crushing of the head.

The present invention was devised to eliminate the problems as described above, and after the high strength concrete pile (PHC) to the drilled pile insertion hole to a predetermined depth, a number of reinforcement to the tip pile cap of the high strength concrete pile (PHC) By screwing the reinforcing bars, but by adding a coupler to the screw hole of the pile cap and the thread of the reinforcing bars by placing concrete for the floor slab while improving the fixing force,

The high strength concrete pile (PHC) is secured by no crushing, so it is structurally stable and there is no need for stuffed concrete according to the strength, and there is no loosening phenomenon because the coupler has excellent fixing force of rebar. It is very eco-friendly because it does not occur at all, and there is no loss of pile material, it is very economical, and the construction speed is very fast, which shortens the construction period and reduces the labor cost. It is an object of the present invention to provide a structure.

1 is a drilling process diagram of the ground according to the present invention

Figure 2 is a cement milk grouting construction on the perforated ground according to the invention

Figure 3 is a state diagram in which the high-strength concrete piles in the perforation according to the present invention

4a and 4c is a head reinforcement detail of the high strength concrete pile according to the present invention,

Figure 4a is an exploded perspective view of inserting reinforcing bars in the pile cap of the exposed pile tip

Figure 4b is an enlarged exploded perspective view of inserting the reinforcing bar into the pile cap of the exposed pile tip

Figure 4c is an enlarged cross-sectional view of the reinforcing bar coupled to the pile cap of the exposed pile tip

5 is an overall perspective view of the reinforcing bar coupled to the cap of the exposed pile tip

6 is a sectional view of floor slab pouring using high strength concrete piles reinforced with head

Figure 7 is a floor slab casting cross-sectional view using a conventional concrete pile

Explanation of symbols on the main parts of the drawings

1: pile insertion hole 2: cement milk grouting

3: high strength concrete pile 4: pile cap

5: screw hole 6: PC steel rod fixing hole

7: PC steel bar 8: Reinforcing bar

9: threaded portion 10: coupler

11 essential part 12: strip reinforcing bar

13: finish plate

Hereinafter, preferred embodiments of the present invention will be described.

As shown in FIG. 1, after drilling a pile insertion hole in a destination panel for constructing a civil engineering or building structure as shown in FIG. 1, cement pile grouting is filled in the pile insertion hole as illustrated in FIG. 2. Secure by inserting high strength concrete pile (PHC).

In this state, a plurality of reinforcing bars are coupled to the pile cap coupled to the head of the high strength concrete pile (PHC) exposed at a constant height (about 10 cm from the ground),

The reinforcing bar is to be fixed by a plurality of ring-shaped band reinforcing bars, the lower end of the reinforcing bar to form a screw portion is coupled to the screw hole of the pile cap,

The screw portion of the reinforcing bar is to combine a separate coupler to greatly improve the fixing force.

In such a state, when the concrete is placed and cured in the state where the finishing plate is placed inside the tip of the high strength concrete pile (PHC), the floor slab is completed.

When explaining the head reinforcement method of the high strength concrete pile (PHC) by such a construction process in more detail,

First, the pile insertion hole 1 for drilling the pile into the ground on which the structure is to be constructed is drilled.

When the pile insertion hole 1 is drilled, the cement milk grouting 2 is filled in the pile insertion hole 2, and the high strength concrete pile 3 is inserted therein.

At this time, the cement milk grouting (2) inside the pile insertion hole (2) is distributed evenly on the side circumferential surface of the high strength concrete pile (3) while removing the gap between the pile insertion hole (1) and high strength concrete pile (3) stable position Will be induced to have.

At this time, the high-strength concrete pile (3) is most ideal to drill the pile insertion hole (1) to a certain depth so that the exposure height from the ground is maintained about 10 cm.

In the conventional pile cap 4 coupled to the tip of the exposed high-strength concrete pile 3, a screw hole 5 and a PC steel rod fixing hole 6 are radially formed in succession, respectively. And PC steel rod fixing hole (6) is required in the mass production process of the high-strength concrete pile (3), the screw hole (5) is used for fixing the pile cap (4), the PC steel rod fixing hole (6 ) Is to hang the tip of the PC steel bar (7) for strength reinforcement inside the concrete pile.

Therefore, as the screw hole 5 of the pile cap 4, as shown in Figures 4a to 4c separate reinforcing reinforcement (8) screw portion 9 is to be fixed by screwing,

The lower end of the reinforcing bar (8) is to form a threaded portion (9) of the diameter corresponding to the threaded hole (5) of the pile cap (4) to be combined with each other.

In addition, by coupling the coupler 10 to the threaded portion 9 of the reinforcing bar 8, the coupling force of the reinforcing bar 8 can be further improved.

As shown in FIG. 4C, the coupler 10 has a recess 11 having a predetermined diameter formed at an inner lower portion thereof, so that the reinforcing bar 8 is coupled to the screw hole 5 of the pile cap 4. When the coupler 10 is rotated in close contact with the surface of the pile cap 4, the axial force is increased by the recess 11 in the inner side to prevent loosening of the coupler 10 and the reinforcing bar 8. More secure fixing is achieved.

Accordingly, as shown in FIG. 5, when each reinforcing bar 8 is firmly fixed by the coupler 10, and a plurality of band reinforcing bars 12 are bundled and fixed, the reinforcement of the concrete pile without the flow of the reinforcing bar 8 is secured. Tofu reinforcement is complete.

When the head reinforcement process of the high-strength concrete pile (3) is completed, when the concrete is placed in a state in which a separate closing plate 13 is mounted on the upper surface of the high-strength concrete pile (3), the floor slab is shown in FIG. It is finished.

Therefore, since the head of the concrete pile is not crushed as in the related art, the strength is securely maintained and construction can be performed more stably, and the concrete filled inside the pile to compensate for the longitudinal cracking and effective prestress reduction caused by the pile crushing It was necessary to go through the process of filling, but as soon as the secured strength does not require any of the above filling concrete will be able to work faster and more concise.

In addition, it is possible to work even in the rain can shorten the construction period, there is an advantage that anyone can easily work without skilled workers.

In particular, since tofu reinforcement is made by no crushing, there is no waste generated by crushing, so it is very environmentally friendly and very economical because there is no loss of pile materials.

As described above, the method of reinforcing the non-crushed head and the reinforcing structure of the high strength concrete pile according to the present invention ensure the strength of the high strength concrete pile (PHC) according to the no crushing, so that it is structurally stable and the filled concrete is secured according to the strength. It is not necessary at all, and the coupler has excellent fixing force of rebar, so there is no loosening phenomenon, no waste is generated and it is very eco-friendly, and there is no loss of pile material, so it is very economical and the construction speed is very fast and the construction period is shortened. Of course, the labor cost reduction effect is excellent.

Claims (3)

After drilling the pile insertion hole in the destination panel for the construction of civil engineering or building structure, and fixing the high strength concrete pile (PHC) in the pile insertion hole while filling the cement insert grouting with the pile insertion hole, Combine multiple reinforcing bars to the pile cap coupled to the head of the high strength concrete pile (PHC) exposed to a constant height, The reinforcing bar is to be fixed by a plurality of ring-shaped band reinforcing bars, the lower end of the reinforcing bar is formed by screwing it together with the coupler to the screw hole of the pile cap, A method for reinforcing crushed heads of high strength concrete piles, characterized in that the floor slab is completed by placing and curing concrete in the state where the finishing plate is placed inside the tip of the high strength concrete pile (PHC). A plurality of reinforcing bars (8) vertically installed at the upper end of the known high-strength concrete pile (3) to which the PC steel bar (7) is coupled to the pile cap (4) of the tip, and the PC steel bar (7) is embedded. Combine, The lower end of the reinforcing bar (8) is formed with a threaded portion (9), the threaded portion (9) is coupled to the threaded hole (5) formed in the pile cap (4), a separate coupler (10) to the threaded portion (9) Screwed) to thereby prevent loosening of the reinforcing bars (8), The reinforcing bar reinforcement structure of the high strength concrete piles, characterized in that the plurality of reinforcing bars (8) is coupled to the band reinforcing bars 12 of the upper and lower predetermined intervals. The method of claim 2, The lower inner side of the coupler 10 to form a recess 11, thereby reinforcing reinforcement (8) is more crushed head reinforcement structure of the high-strength concrete pile, characterized in that it is more firmly fixed.