KR102685846B1 - Head reinforcement cap for PHC pile - Google Patents

Abstract

The present invention relates to a head reinforcing cap for a PHC pile. The reinforcing cap, which is fitted to the size from the top in a state where the head of the pile is arranged, is attached to the outside of the pile, the first upper flange portion, and the second upper flange portion based on the body portion. At the same time, reinforcing bars are placed on the inside and outside of the pile, and the inside and outside of the pile, including the top part, are firmly reinforced by pouring concrete while connecting the support plate and reinforcing bars inside the pile. By doing this, the concrete damage and vertical cracks on the cut surface of the pile that occur after cutting the head pile are firmly reinforced, and furthermore, when forming the floor foundation, the effect of building a solid ground along with the foundation floor (mat formation) is provided. .

Description

Head reinforcement cap for PHC pile}

The present invention relates to a head reinforcing cap for a PHC pile, and more specifically, in the process of reinforcing the head of a pile driven into the ground by driving, the inner and outer sides, including the upper end of the pile, are firmly reinforced to secure the head of the pile. This relates to a head reinforcement cap for PHC piles that firmly reinforces the longitudinal cracks and damage to the concrete on the cut surface of the pile that occurs during cutting.

In general, soft ground that is to be reinforced during the foundation construction of civil engineering or building structures refers to cases where the ground itself cannot withstand the load transmitted from the upper structure or the predicted settlement exceeds the allowable limit, such as soft clay, loose sandy soil, organic soil, etc. It belongs to this.

It is well known that if roads, transportation, buildings, etc. are constructed on the ground composed of such soft clay or organic soil, not only will the shear area settlement be excessive, but also safety problems will arise due to weakening of bearing capacity.

Among the countermeasures against the stability and settlement problems of structures based on such soft ground, the commonly used method of reaching the support layer with the embankment load (PILE method) is to use steel pipe piles pre-produced at the factory, and PHC (Prestressed High-Strength Concrete). Pile) piles, PC (Prestressed Concrete) piles, and RC (Reinforced Concrete) piles are constructed using methods such as type method (percussion, vibration) or embedded method.

At this time, PHC piles have the advantages of superior axial load bearing capacity, resistance to blows, and large bending resistance compared to PC piles, so they are widely used as piles for designated construction.

However, these piles are struck continuously depending on the condition of the ground, and after being struck appropriately, the piles protruding above the ground are different, so they are cut appropriately and the ends are reinforced. This is how the end of the pile is formed. Reinforcing is called “head cleaning.”

After arranging and reinforcing the head of such a pile, in some cases, after pouring the abandoned concrete, the reinforcement bars are fixed vertically from the top of the pile, and the reinforcement bars to form a foundation floor (mat) are placed horizontally and vertically at the top of the pile in a horizontal direction. The foundation concrete is placed and the foundation concrete is poured.

If a structure is built based on driven piles and poured concrete as described above, the structure can be supported more stably.

For reference, the driven pile goes through the process of cutting at the same height so that it is exposed 150mm from the ground. Small cracks (longitudinal cracks) may occur due to concrete removal after cutting the steel wire, or the pile may be cut with a hand hammer to remove concrete from the cut pile. During the removal process, some concrete parts may break and fall off.

Normally, pouring concrete on top of the broken part and filling the finely broken part with concrete is incidental, but fundamentally, head reinforcement must be done.

When reinforcing the head, it is used to connect the floor slab with reinforcing bars. At this time, the pile head must be reinforced in order to accurately transmit the load of the superstructure to the pile.

If head reinforcement is not provided, cracks may occur at the connection between the slab and the pile, preventing the upper load from being transmitted properly, and damage to the pile head due to the load may cause the structure to sink due to incorrect transfer of the load. is one of the important processes.

In relation to the head reinforcement as described above, each pile must maintain its spacing to maintain and develop overall strength, and head reinforcement and mat placement are essential to permanently maintain the pile spacing. In other words, it is to transmit the force being received by each pile to the foundation mat. This means that in order to transmit the force to the structure at the top while each pile is embedded into the rock layer, there must be an intermediate connection structure, which is the head reinforcement and foundation mat. This is to make a mat, and here, head reinforcement can be said to be the core of foundation construction as it increases the connection between the foundation and the pile to ensure that the part connected to the foundation is strong and not weak.

In the case of head preparation (head reinforcement) of the pile driven in this way, a head reinforcement cap is installed on the driven pile, and the crew technology related to head preparation and reinforcement of the pile is as follows.

Among the relevant source technologies, Republic of Korea Patent No. 10-1027788 (name: PHC pile head reinforcement structure, hereinafter referred to as 'Patent Document 1'), Registered Patent No. 10-1515344 (name: PHC pile head reinforcement structure, hereinafter referred to as 'Patent Document 1') This is referred to as 'Patent Document 2') and Registered Patent No. 10-1050458 (name: Head reinforcement structure of PHC pile, hereinafter referred to as 'Patent Document 3') are disclosed.

The above patent documents 1 to 3 are all structures for reinforcing the head of a pile after cutting the head of the pile, and include a tendon material disposed on the circumference of the pile, a support plate guided to the inner diameter of the pile, and a pile when forming a foundation floor by supporting the support plate. It is made by binding with connected reinforcing bars so that it can be organized along with reinforcement of the head of the pile.

However, as mentioned above, damage to the cut surface of the head or longitudinal cracks resulting from the cutting process for head preparation are not properly reinforced, and only the inner diameter side of the head of the pile is reinforced by pouring rebar and concrete. Because of this, there was a problem of poor durability in the future.

Since the head reinforcement of the pile as described above is hidden by pouring concrete to form the foundation floor in the outer diameter area of the pile, which is exposed only at a set height from the ground, fundamental reinforcement of the pile is essential.

Korean Patent No. 10-1027788 (registered on April 25, 2011) Korean Patent No. 10-1515344 (registered on April 21, 2015) Korean Patent No. 10-1050458 (registered on July 13, 2011)

The present invention was invented to solve the conventional problems as described above. In the process of reinforcing the head of a pile driven into the ground by driving, the inside and outside of the pile, including the upper end, are firmly reinforced to strengthen the pile. The purpose is to provide a head reinforcement cap for PHC piles that can firmly strengthen the longitudinal cracks and damage to the concrete on the cut surface of the pile that occurs when cutting the head of the pile.

According to the present invention for achieving the above object, in the head reinforcement cap for piles for reinforcing the cut head of the pile driven and exposed in the ground,

The head reinforcement cap has a cutout portion formed on one side in a form that surrounds the outer diameter of a file cut into a cylindrical shape, a body portion having a support piece with coupling holes formed at equal intervals corresponding to each other from the cut portion, and an upper outer circumference of the body portion. Reinforcing bar insertion holes for arranging and installing reinforcing bars to the outside of the pile are formed in a circumferential arrangement, and reinforcing bars are placed around the first upper flange portion, which has one side cut along the cut portion of the body portion, and the inner circumference of the top of the body portion of the pile. Reinforcing bar insertion holes for inward arrangement are formed in a circumferential arrangement, a second upper flange portion with one side cut along the incision of the body portion, and a reinforcing bar insertion hole of the upper flange portion formed on the lower outer circumference of the body portion. Reinforcement fastening holes for fastening the lower end of the reinforcing bar inserted through are arranged in a circumferential shape, a lower flange portion with one side cut along the cut portion of the body portion, and a disk-shaped portion located inside the pile to form the second upper portion. The reinforcing bar is connected and fixed to the lower part of the reinforcing bar arranged inside the body through the flange part and is fixed to the inside of the pile through the second upper flange part at the top to prevent concrete from being injected into the inside of the pile when pouring concrete. Fastening bosses for fastening the lower part are arranged at intervals on the outer side of the supporting plate arranged in a circumferential shape, the body part and the first upper flange part exposed from the ground, and the upper outer side of the pile head is formed by pouring concrete therein. It is characterized by comprising a cylindrical frame that reinforces the circumference, and bolts and nuts that are fastened to the coupling hole on the support side of the body portion and secure the body portion according to the outer diameter of the pile.

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The lower flange portion of the head reinforcement cap according to the present invention is characterized in that head reinforcement of the pile is performed by being buried to a depth of 600 to 700 mm from the ground.

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The head reinforcing cap for a PHC pile according to the present invention is a reinforcing cap that is covered according to size from the top in a state where the head of the pile is arranged, and is formed on the outside of the pile with respect to the body and by the first upper flange portion and the second upper flange portion. At the same time as protecting the upper part of the pile, reinforcing bars are placed inside and outside the pile, and inside the pile, the inner and outer sides, including the upper part of the pile, are firmly reinforced by pouring concrete while connecting the support plate and reinforcing bar. By doing this, the concrete damage and vertical cracks on the cut surface of the pile that occur after cutting the head pile are firmly reinforced, and furthermore, when forming the floor foundation, there is an effect of building a solid ground along with the foundation floor (mat formation).

Figure 1 is a perspective view showing the head reinforcement cap for PHC pile of the present invention,
Figure 2 is a perspective view showing the head reinforcement cap according to the present invention cut in the longitudinal direction;
Figure 3 is a perspective view showing a state in which reinforcing bars are placed in the head reinforcement cap according to the present invention;
Figure 4 is a cross-sectional view showing a state in which the head reinforcement cap according to the present invention is applied to a PHC pile;
Figure 5 is a cross-sectional view illustrating the state in which concrete is placed after inserting the reinforcing bars in Figure 4;
Figure 6 is a cross-sectional view showing a reinforced state in which the head reinforcement cap and reinforcing bar are arranged in the PHC pile according to the present invention.

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

Prior to this, terms or words used in this specification and claims should not be construed as limited to their usual or dictionary meanings, and the inventor should appropriately use the concept of terms to explain his or her invention in the best way. It must be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle of definability.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent the entire technical idea of the present invention, so at the time of filing this application, they can be replaced. It should be understood that various equivalents and variations may exist.

The head reinforcement cap for PHC pile according to the present invention will be described with reference to the attached Figures 1 to 6 as follows.

In the head reinforcement cap for a pile to reinforce the cut head of the pile (1) driven and exposed on the ground,

The head reinforcement cap 100 is made of metal, and has a body portion 10 that is cylindrical in appearance, a first upper flange portion 20, a second upper flange portion 20', and a lower flange portion ( 30) and a support plate 40.

The body portion 10 has a cylindrical size corresponding to the outer diameter of the pile 1, is shaped to surround the outer diameter of the cut pile 1, and has a cut portion 11 formed on one side, and the cut portion 11 ), the support pieces 12 in which the coupling holes 12a are formed at equal intervals to correspond to each other are formed integrally.

The first upper flange portion 20 is formed integrally around the upper outer circumference of the body portion 10, and has a reinforcing bar insertion hole 21 for arranging and installing the reinforcing bars 2 to the outside of the pile 1. It is arranged in a circumferential shape and has one side cut along the cut portion 11 of the body portion 10.

In addition, the second upper flange portion 20' extends along the same line as the first upper flange portion 20 to the upper inner circumference of the body portion 10, and attaches the reinforcing bar 2 to the pile 1. The reinforcing bar insertion holes 22 for arranging the inside are arranged in a circumferential shape, and have a shape with one side cut along the cut portion 11 of the body portion 10.

The lower flange portion 30 is integrally formed around the lower outer circumference of the body portion 10 and fastens the lower end of the reinforcing bar 2 inserted through the reinforcing bar insertion hole 21 of the first upper flange portion 20. The reinforcement fastening holes 31 for this purpose are arranged in a circumferential shape, and one side is cut along the cut portion 11 of the body portion 10.

That is, the first upper flange portion 20, the second upper flange portion 20', and the lower flange portion 30 are manufactured separately and welded to the upper and lower portions of the body portion 10, respectively. The rebar insertion holes 21 and 22 and the rebar fastening holes 31 are arranged on the inside and outside of each flange part, that is, on the inside and outside of the pile 1, so that they can be reinforced.

Instead of the reinforcing bar fastening hole 31, it can also be formed in the form of a boss that can accommodate and fasten the lower part of each guided reinforcing bar to a predetermined depth.

The support plate 40 is located on the inside of the pile 1 and is connected and fixed to the lower end of the reinforcing bar 2 arranged inside the body through the second upper flange portion 20', allowing the pouring of concrete (C). Be sure to prevent concrete from being injected into the interior of the pile (1).

The support plate 40 is in the shape of a disk, and on its upper part is a circular fastening boss 41 for fastening the lower end of the reinforcing bar 2 fixed to the inside of the pile 1 through the second upper flange portion 20'. It is formed in a columnar arrangement.

The lower part of the reinforcing bar is connected by providing a fastening screw portion and fastening it to the reinforcing bar fastening hole of the lower flange part and the fastening boss of the support plate, or by adding a fixing ring (R) to the outer circumference of the first upper plank. It can be easily fixed before pouring concrete at the top of the branch and second upper flange section.

Meanwhile, a bolt (B) and a nut (N) for fixing the body 10 according to the outer diameter of the pile 1 are fastened to the coupling hole 12a on the support piece 12 side of the body 10.

The support plate 40 can be positioned at a required depth within the pile 1, and can be bolted while positioned close to the inner diameter of the pile 1 through the cutout 11 of the body 10. Ensure that (B) and nut (N) are fastened.

The lower flange portion 30 of the head reinforcement cap 100 is embedded to a depth of 600 to 700 mm from the ground to reinforce the head of the pile 1.

For reference, the length of the pile exposed to the ground is approximately 150 mm, and the overall length of the head reinforcement cap according to the present invention is manufactured to be 750 to 850 mm.

Meanwhile, a cylindrical frame 50 is disposed on the outside of the body portion 10 and the upper flange portion 20 exposed from the ground and reinforces the upper outer circumference of the head of the pile (1) by pouring concrete (C). do.

The reinforcing bars 2 disposed in the first upper flange portion 20 are arranged with a larger diameter than the reinforcing bars disposed inside the second upper flange portion 20' to increase the lateral pressure due to the formation of the foundation floor in the future. .

The state of reinforcing the head reinforcement cap of the present invention configured as described above by applying it to the PHC pile is described as follows.

First, in order to prepare the head of the pile (1) that has been driven and driven into the ground at intervals, it is cut leaving about 150 mm above the ground, and then combined by covering the top with a head reinforcing cap (100), and then reinforcing bar (2). It is possible to reinforce the head of the pile (1) by pouring concrete (C) along with the placement of.

Before covering the lower part of the head reinforcement cap 100 from the upper part of the pile 1, a bolt (B) and a nut ( N) is fastened, and the previously prepared support plate 40 is guided to the inside of the body 10 through the cut part 11, and the reinforcing bar 2 through the second upper flange part 20' is connected to the support plate ( While connected to the fastening boss 41 of 40), the bolt (B) and nut (N) are fastened to adjust the body portion (10) to a size that is as close to the outer diameter of the pile (1) as possible.

In the above state, reinforcing bars (2) are respectively inserted into the lower flange part (30) through the first upper flange part (20) and arranged in a cylindrical shape, and this form is shown in the attached Figures 3 and 4. It is the same as what was said.

As described above, the reinforcing bar (2) is disposed on the outside of the first upper flange part (20) and the lower flange part (30) and on the inside of the pile (1) through the second upper flange part (20'). Concrete (C) is poured from the top of the reinforcement cap (10). At this time, the concrete (C) is poured in such a way that the concrete (C) is filled between the inside of the pile (1) and the cut portion (11) of the body portion (10).

When concrete is poured with a cylindrical frame 50 placed on the upper side of the pile 1 exposed to the ground, the inner and outer portions through the incision 11 of the body 10 are finally formed with concrete ( C) is filled, and after the concrete is cured for a certain period of time, the reinforcement of the upper outer circumferential part of the head of the pile (1) is also completed.

The reinforcing bars (2) in the above state are arranged on the inside and outside of the head reinforcement cap (100) and are formed on the inside and outside of the top of the pile (1) by the poured concrete (C), as shown in Figure 6 attached. By reinforcing at the same time, stronger pile reinforcement is achieved.

In other words, by reinforcing the damaged area of concrete on the cut surface that occurred when the head of the pile 1 was cleaned or the longitudinal crack applied to the pile, it is possible to firmly reinforce the pile as described above before foundation.

Although not shown in the drawing, the reinforcing bars (2) are later extended or woven horizontally or vertically to the top to form a foundation floor (mat) by pouring concrete, and each pile is a single ground construction structure. When formed, it can provide a solid floor.

As described above, the present invention has been described with specific details such as specific components and limited embodiments and drawings, but this is only provided to facilitate a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , those skilled in the art can make various modifications and variations from this description.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and the scope of the patent claims described below as well as all things that are equivalent or equivalent to the scope of the claims will be said to fall within the scope of the spirit of the present invention. .

1: Pile 2: Rebar
10: body 11: incision
12: support piece 12a: coupling hole
20: 1st upper flange 20' 2nd upper flange
21, 22: Rebar insertion hole 30: Lower flange part
31: rebar fastener 40: support plate
41: fastening boss 50: cylindrical frame
100: Head reinforcement cap B: Bolt
C: Concrete N: Nut

Claims (4)

In the head reinforcement cap 100 for a pile to reinforce the cut head of the pile 1 driven and exposed in the ground,
The head reinforcement cap 100,
A cutout part 11 is formed on one side in a form that surrounds the outer diameter of the file 1 cut into a cylindrical shape, and a support piece 12 is provided with coupling holes 12a formed at equal intervals to correspond to each other from the cutout part 11. A body portion (10) having,
Reinforcing bar insertion holes 21 for arranging and installing reinforcing bars 2 to the outside of the pile 1 are formed circumferentially around the upper outer circumference of the body 10, and an incision in the body 10 is formed. A first upper flange portion (20) with one side cut along the portion (11),
Reinforcing bar insertion holes 22 for arranging and installing reinforcing bars 2 to the inside of the pile 1 are formed circumferentially around the upper inner circumference of the body 10, and an incision in the body 10 is formed. A second upper flange portion (20') with one side cut along the portion (11),
A reinforcing bar fastening hole 31 is formed on the lower outer circumference of the body portion 10 and is used to fasten the lower end of the reinforcing bar 2 inserted through the reinforcing bar insertion hole 21 of the upper flange portion 20. A lower flange portion (30) formed in an array and cut on one side along the cut portion (11) of the body portion (10),
It is located inside the pile (1) in a disk shape and is connected and fixed to the lower end of the reinforcing bar (2) arranged inside the body through the second upper flange portion (20'), so that when pouring concrete (C), the pile To prevent concrete from being injected into the interior of (1), there is a fastening boss (41) at the top for fastening the lower end of the reinforcing bar (2), which is fixed to the inside of the pile (1) through the second upper flange portion (20'). A support plate 40 arranged in a columnar shape,
It is disposed at intervals on the outside of the body portion 10 and the first upper flange portion 20 exposed from the ground, and reinforces the upper outer circumference of the head of the pile (1) by pouring concrete (C) therein. A cylindrical frame 50,
Consisting of a bolt (B) and a nut (N) fastened to the coupling hole (12a) on the support piece (12) side of the body portion (10) to secure the body portion (10) according to the outer diameter of the pile (1). Head reinforcement cap for PHC pile, characterized in that.
delete According to paragraph 1,
A head reinforcement cap for PHC piles, characterized in that the lower flange portion 30 of the head reinforcement cap 100 is embedded to a depth of 600 to 700 mm from the ground to achieve head reinforcement of the pile 1.
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