KR20190016819A - Crack inducer for concrete pile head cutting, concrete pile therewith, and construction method thereof - Google Patents

Abstract

The present invention relates to a crack generating apparatus for cutting a concrete pile head, a concrete pile therewith, and a construction method thereof, which introduce a fluid into a fluid inflow space and induce cracks at an end portion of first and second pressurizing plates, thereby easily separating the head of the cast-in-place concrete pile automatically without a concrete crushing operation through human force. The crack generating apparatus for cutting the concrete pile head of the present invention, which is provided on the inside or the outside of a reinforcing steel net of the circular concrete pile and is embedded in concrete, includes: a first pressurizing plate and a second pressurizing plate which are vertically provided to each other in a plate type ring shape and form a fluid inflow space therebetween; and an inlet pipe connecting hole coupled to an inlet hole formed on at least one of the first pressurizing plate or the second pressurizing plate.

Description

Technical Field [0001] The present invention relates to a concrete pile head, a concrete pile head cutting method, and a construction method thereof,

The present invention relates to a concrete pile head assembly capable of automatically separating the head of a pile of a pile placed in a field without inducing a crushing of the concrete by gravity by introducing a fluid into the fluid inflow space and inducing cracks at the ends of the first and second pressure plates A crack generating device for cracks, a concrete pile having a crack generating device, and a method of applying the same.

The construction of the concrete pile in the field is carried out through the procedure of inserting the reinforcing net into the excavation hole and then pouring the concrete after the excavation of the ground.

In this case, a trestle tube is inserted into the excavation hole in advance to prevent material separation due to the concrete drop before the concrete is poured, and the concrete is laid at a certain depth in the concrete in which the lower end of the trestle tube is laid.

However, unlike the upper construction, the height of one pile is very high and some soil is present inside the excavation pile. Therefore, the quality of the pile upper concrete is not good because of the latency in the upper part of concrete.

For this reason, concrete is poured at a height higher than the planned length, and then the head is cut to construct the pile.

Generally, the pile concrete cover on the outside of the reinforcing net is cut by using a rotary cutter, and the inner side of the reinforcing bar is crushed by a breaker or the like. Concrete crushing by double breaker depends on manpower, so it is time consuming and there is a limit to the work precision.

In addition, the crushing operation by such a compact equipment causes a lot of waste, and in particular, there is a problem that a waste disposal process is complicated and a cost is considerably increased in a marine operation.

KR 10-0859647 B1

In order to solve the above problems, the present invention provides a crack generating device and a crack generating device for a concrete pile head augmentation which can automatically separate the head concrete without crushing the concrete by the gravitation force when the head pile of the pile And a method of constructing the pile.

According to a preferred embodiment of the present invention, a first presser plate and a second presser plate, which are provided on the inner side or outer side of a reinforcing bar of a circular concrete pile and are embedded in concrete, And an inlet pipe coupling coupled to the inflow hole formed in any one of the first pressure plate and the second pressure plate; The present invention provides a crack generating apparatus for a pile head assembly for a concrete pile.

According to another preferred embodiment of the present invention, there is provided a crack generating apparatus for a concrete pile head augmentation, wherein an outer side of the fluid inflow space is closed and an inner side is partially or entirely opened.

According to another preferred embodiment of the present invention, there is provided a crack generating device for a concrete pile head assembly, wherein a gasket ring is provided on an inner end side between the first and second platens.

According to another preferred embodiment of the present invention, the inner end of the gasket ring is provided with a cracked oil tool whose outer side is in close contact with the inner end of the first pressure plate and the second pressure plate and whose inner side is sharp. A crack generating device for cracking is provided.

According to another preferred embodiment of the present invention, the inner end of the second platen is formed to be longer than the inner end of the first platen, and the end of the first platen is formed to be inclined toward the end of the second platen, And an elastic ring closely attached to one side surface of the pile head is coupled to the pile head.

According to another preferred embodiment of the present invention, the inner end portions of the first and second platen plates are inclined and formed as a sharp point as a whole.

According to another preferred embodiment of the present invention, there is provided a crack generating apparatus for a concrete pile head assembly, wherein outer and inner sides of the fluid inflow space are closed.

According to another preferred embodiment of the present invention, a circular concrete pile composed of a reinforcing net and concrete in which the reinforcing net is embedded is provided in the inner side or outer side concrete of the reinforcing net at the position where the concrete is to be cut, And the one end of the inflow pipe exposed at the upper end of the pile is connected to the inflow pipe connecting port of the crack generating apparatus for cleaning the head.

According to another aspect of the present invention, there is provided a concrete pile provided with a crack generating device for cleaning the head, wherein a reinforcing steel covering is applied to a lower portion of the vertical reinforcing bars of the reinforcing net up to a distance lower than a predetermined distance.

According to another preferred embodiment of the present invention, there is provided a method of constructing a concrete pile provided with the crack generating apparatus for cleaning the head, comprising the steps of: (a) preparing a reinforcing net; (b) installing the crack generating device for cleaning the ceiling inside or outside the reinforcing net at the pile cutting site, connecting the inlet pipe to the inlet pipe connection port, and positioning the other end of the inlet pipe above the concrete pavement installation surface; (c) installing a reinforcing net provided with the crack generating device for theoretic cleaning in the excavation hole; (d) forming a concrete pile by placing and curing the concrete at a predetermined height; (e) supplying a fluid to the inlet pipe to form a crack surface in the concrete by opening the first and second pressure plates; And (f) salvaging the separated head concrete to remove it; The method of claim 1, further comprising:

According to another preferred embodiment of the present invention, in the step (a) or (b), a steel reinforced concrete pile is placed on the upper portion of the vertical steel reinforcing bar to cover the steel reinforced concrete to a distance lower than a predetermined distance to provide.

According to another preferred embodiment of the present invention, the steel pipe casing is inserted into the excavation hole, and in step (d), the steel pipe casing is cut from the lower portion of the concrete cutting site after the formation of the concrete pile. .

According to the present invention, the fluid is introduced into the fluid inflow space of the crack generating apparatus, and the first and second pressure plates are opened between the first and second pressure plates when the pressure is applied, thereby inducing cracks in the pile concrete.

Therefore, it is convenient to easily separate the head concrete automatically without crushing the concrete by the gravity when the head pile of the pile of the spotting concrete is put together.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a crack generating apparatus for a pile head pile of the present invention. FIG.
2 is a cross-sectional view taken along line A-A 'in Fig.
FIG. 3 is a cross-sectional view showing the appearance of concrete cracking due to fluid inflow in FIG. 2;
4 is a cross-sectional view showing an embodiment of a crack generating device for the concrete pile head assembly according to the present invention.
Fig. 5 is a cross-sectional view showing first and second platens whose outer ends are joined by welding. Fig.
Fig. 6 is a cross-sectional view showing first and second pressure plates whose outer ends are joined by a connecting member; Fig.
7 is a cross-sectional view showing a crack generating device provided with a gasket ring;
8 is a sectional view showing a crack generating device provided with a cracking oil tool.
9 is a cross-sectional view showing the appearance of concrete cracking caused by the crack generating apparatus of FIG. 8;
10 is a cross-sectional view showing a crack generating device provided with an elastic ring.
11 is a cross-sectional view showing a state of occurrence of concrete cracking by the crack generating apparatus of Fig.
12 is a cross-sectional view showing a crack generating device having a sharpened inner side end.
13 is a cross-sectional view showing a crack generating device in which a fluid inflow space is closed inside and outside.
14 is a perspective view showing a concrete pile provided with a crack generating apparatus for cleaning the head.
15 is a cross-sectional view showing a concrete pile provided with a crack generating device for the crook cleaning according to the present invention, in which a vertical reinforcing bar is provided with a reinforcing steel sheath.
16 is a perspective view showing a stepwise process for a concrete pile construction method according to the present invention.
17 is a perspective view showing a stepwise process for a method of constructing a concrete pile according to the present invention when the steel pipe casing is provided.

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

2 is a cross-sectional view taken along line A-A 'of FIG. 1, and FIG. 3 is a cross-sectional view illustrating a state of occurrence of concrete cracks due to fluid inflow in FIG. Fig. And FIG. 4 is a cross-sectional view showing an embodiment of a crack generating device for the concrete pile head assembly according to the present invention.

1 to 4, the crack generating device for the concrete pile head cleaning according to the present invention is provided inside or outside the reinforcing net 2 of the round concrete pile 1 and is embedded in the concrete 3 A first presser plate 41 and a second presser plate 42 which are vertically provided to each other with a plate ring and in which a fluid inflow space 43 is formed; And an inlet pipe connection port (44) coupled to the inlet hole (411) formed in either the first pressure plate (41) or the second pressure plate (42). . ≪ / RTI >

The present invention relates to a crack generating apparatus for pile head pile preparation, which is capable of generating a crack (C) inside and outside of a reinforcing net (2) in a concrete (3) To separate them.

The crack generating device 4 is provided on the inside or outside of the reinforcing net 2 located in the circular concrete pile 1.

The crack generating device 4 is embedded in the concrete 3 of the circular concrete pile 1 so as to be located on the designed concrete surface for head crowding.

The crack generating device 4 includes a first pressure plate 41, a second pressure plate 42, a fluid inflow space 43 formed by the first and second pressure plates 41 and 42, .

The first presser plate 41 and the second presser plate 42 are each a plate-shaped ring and are vertically positioned.

1 and the like is configured such that the first pressure plate 41 is at the upper portion and the second pressure plate 42 is at the lower portion while the second pressure plate 42 is at the upper portion and the first pressure plate 41 is at the lower portion You may.

A predetermined fluid inflow space 43 is formed between the first pressure plate 41 and the second pressure plate 42.

When the fluid F flows into the fluid inflow space 43 and pressure is applied to the fluid inflow space 43, a crack C is generated in the concrete 3 due to a gap between the first pressurizing plate 41 and the second pressurizing plate 42 (Fig. 3).

At this time, the fluid (F) can use oil or water.

Generally, water has elastic characteristics at high pressure, so it is difficult to use it as a fluid for high pressure. However, in the present invention, only the crack C is generated in the portion of the concrete 3, and the crack C can be sufficiently generated by only the medium and low pressure of the fluid F. Therefore, it is preferable to use economical water as the fluid (F) since no separate cleaning work is required after cleaning the tofu.

The fluid inflow space 43 is sufficient if it is small enough that the concrete 3 can not penetrate.

3, the fluid inflow space 43 may be formed over the entire surface where the first pressure plate 41 and the second pressure plate 42 face each other, and may be formed on the side opposite to the inflow hole 411 (41) and the second pressure plate (42) so as to form a groove wider than the inflow hole (411).

In the latter case, other portions where the first pressure plate 41 and the second pressure plate 42 face each other can be configured to be in close contact with each other.

The inlet pipe connection port 44 is for injecting the fluid F into the fluid inflow space 43 and is connected to the inflow hole 411 formed in any one of the first pressure plate 41 and the second pressure plate 42 do.

As shown in FIG. 3, one end of the inflow pipe 5 for introducing the fluid F is connected to the inflow pipe connection port 44.

The other end of the inflow pipe 5 is exposed to the outside of the concrete 3 (Fig. 14, etc.).

The fluid F supplied through the inflow pipe 5 flows into the fluid inflow space 43 through the inflow pipe connection port 44 and the inflow hole 411. [

As a result, the first presser plate 41 and the second presser plate 42 are opened to generate a crack C in the concrete 3. At this time, the cracks (C) are generated both inside and outside of the reinforcing net (2).

Therefore, it is possible to separate head concrete automatically without crushing concrete by manpower, and pile head can be arranged easily.

2, 3, and so on, the outside of the fluid inflow space 43 may be closed and the inside thereof may be partially or wholly opened.

It is preferable that the first pressure plate 41 and the second pressure plate 42 have their inner ends abutted to each other in an initial state in which the fluid F does not flow into the fluid inflow space 43.

In this case, it is possible to prevent the concrete 3 from flowing into the fluid inflow space 43 side.

The fluid inflow space 43 can be configured to be lowered in height from the outside to the inside so that the inflow hole 411 can be formed in the fluid inflow space 43 43 to the outside.

As described above, when the fluid F flows into the fluid inflow space 43, a crack C is generated in the concrete 3 as the first presser plate 41 and the second presser plate 42 are opened do. Thereafter, the fluid F flowing into the fluid inflow space 43 flows inward to penetrate the inside of the concrete 3 through the crack surface, thereby promoting the diffusion of the cracks C.

Fig. 5 is a cross-sectional view showing first and second pressure plates whose outer ends are joined by welding, and Fig. 6 is a sectional view showing first and second pressure plates whose outer ends are joined by a connecting member.

As shown in Fig. 5, the outside of the fluid inflow space 43 can be closed by welding (W) the outer end portions of the first pressure plate 41 and the second pressure plate 42.

6, the outer side of the fluid inflow space 43 is formed by connecting a separate connecting member 47 to an end portion to connect the first pressure plate 41 and the second pressure plate 42, The outside of the space 43 may be closed.

For this, the connecting member 47 may have a U-shaped cross section so that the outer end portions of the first and second pressing plates 41 and 42 are inserted and fitted in the inner side.

The connecting member 47 may be made of various materials such as metal, or may be made of an elastic material for ease of manufacture and coupling.

The connection member 47 is provided with a gap maintaining portion 471 at the center of the inner side of the connection member 47 so as to form a fluid inflow space 43 between the first pressure plate 41 and the second pressure plate 42 Can be protruded. A first presser plate 41 and a second presser plate 42 are positioned above and below the gap holding part 471, respectively.

7 is a cross-sectional view showing a crack generating device equipped with a gasket ring.

As shown in FIG. 7, a gasket ring 45 may be provided on the inner end side between the first pressure plate 41 and the second pressure plate 42.

The gasket ring 45 prevents the concrete 3 from penetrating into the fluid inflow space 43 when the concrete 3 is poured.

The gasket ring 45 may be made of elastic material such as rubber, and a plate-like ring may be used.

FIG. 8 is a sectional view showing a crack generating device equipped with a cracking tool, and FIG. 9 is a sectional view showing a state of occurrence of concrete cracking by the crack generating device of FIG.

8, the inner side of the gasket ring 45 is provided with a cracking tool 451 whose outer side is in close contact with the inner end of the first pressure plate 41 and the second pressure plate 42 and whose inner side is sharp, May be provided.

The gasket ring 45 may be provided with a cracking tool 451 at its inner end.

The outer side of the cracking oil tool 451 may be longer than the inner end of the gasket ring 45 so as to cover the inner ends of the first and second pressure plates 41 and 42 at the same time.

The outer side of the cracking tool 451 is caught by the ends of the first and second pressure plates 41 and 42 to fix the position of the gasket ring 45.

The inner side of the cracking tool 451 is narrowed toward the inner side to be sharp.

Accordingly, as shown in FIG. 9, a ridge portion is formed in the end face of the concrete 3 to generate stress concentration, thereby inducing the concrete crack to be easily generated.

FIG. 10 is a cross-sectional view showing a crack generating device equipped with an elastic ring, and FIG. 11 is a sectional view showing a state where concrete cracks are generated by the crack generating device of FIG.

10 and 11, an inner end portion of the second pressure plate 42 is formed to be longer inward than an inner end portion of the first pressure plate 41, An elastic ring 46 formed to be inclined toward the end side of the pressure plate 42 and closely attached to one side of the second pressure plate 42 may be coupled.

The first pressure plate 41 and the second pressure plate 42 may be disposed such that the second pressure plate 42 protrudes inwardly so that the inner ends of the first pressure plate 41 and the second pressure plate 42 do not coincide with each other.

One side of the elastic ring (46) is coupled to the inner end of the first pressure plate (41).

The other surface of the elastic ring 46 is joined to one surface of the second pressure plate 42, that is, the upper surface of the second pressure plate 42 in FIG.

The elastic ring 6 may be previously formed and attached or fitted between the first pressure plate 41 and the second pressure plate 42, or may be formed by sealing, molding and curing with a material such as a sealant.

Accordingly, the elastic ring 46 closes the inside of the fluid inflow space 43, thereby preventing the concrete paste from penetrating into the fluid inflow space 43 when the concrete 3 is poured.

On the other hand, if the inner end portions of the first and second pressing plates 41 and 42 are positioned on the same vertical line, the initial cracking of the concrete may be delayed.

Therefore, the elastic plate 46, which is inclined toward the second pressure plate 42, is joined to the inner end of the first pressure plate 41 by forming the second pressure plate 42 as a long press plate. Thus, the cracks C are easily generated in the concrete 3 at a low pressure through the stress concentration occurring in the concrete 3 at this portion, and the cracks C can be easily generated at the height at which the first pressure plate 41 and the second pressure plate 42 meet So that cracks (C) can be generated in the cracks.

The elastic ring 46 is inclined so that its width decreases from the first pressure plate 41 to the second pressure plate 42 side.

12 is a cross-sectional view showing a crack generating device having a sharpened inner side end.

As shown in FIG. 12, the inner end portions of the first and second pressure plates 41 and 42 may be formed to be inclined so as to have a generally pointed shape.

In other words, the inner end of the first pressure plate 41 is inclined so as to protrude inward as it goes downward. The inner end of the second pressure plate 42 is inclined so as to protrude inward as it goes to the top, The inner end portions of the second pressure plate 41 and the second pressure plate 42 may be pointed.

When the inner end of the first pressure plate 41 and the second pressure plate 42 is sharpened, a right angle portion is formed in the concrete 3 contacting the first pressure plate 41 and the second pressure plate 42.

Since the stress is concentrated on the right corner portion, the crack C can be easily introduced into the concrete 3 at the initial stage of the inflow of the fluid F into the fluid inflow space 43.

13 is a cross-sectional view showing a crack generating device in which the fluid inlet space is closed inside and outside.

As shown in FIG. 13, the fluid inflow space 43 may be configured such that the outer side and the inner side are closed.

When both the inside and the outside of the fluid inflow space 43 formed by the first pressure plate 41 and the second pressure plate 42 are closed, the fluid inflow space 43 are maintained.

That is, when the fluid F flows into the fluid inflow space 43, the first pressurizing plate 41 and the second pressurizing plate 42 are respectively pressed upward and downward to cause puffing deformation, C).

In other words, cracks C are generated by the self-deformation of the first and second pressure plates 41 and 42.

The above configuration is suitable for piles having small diameters because cracks should occur in the entire pile section due to expansion of the crack generating device. Since the fluid is not leaked and does not need to be cleaned, use of oil which can apply pressure higher than water This is possible.

FIG. 14 is a perspective view showing a concrete pile provided with a crack generating apparatus for cleaning the head of the present invention. FIG.

The present invention provides a concrete pile having a crack generating apparatus for a cementing head which comprises a concrete pile (1) composed of a reinforcing net (2) and a concrete (3) in which the reinforcing net (2) The crack generating device 4 for cleansing the head is embedded in the inside or outside concrete 3 of the reinforcing net 2 at the position to be cut and the inlet pipe connection port 44 of the crack generating device 4 for cleansing the toe And one end of the inflow pipe 5, whose other end is exposed to the upper end of the pile 1, is connected.

The constitution and the role of the crack generating apparatus 4 for cleansing the head are the same as those described with reference to Figs.

Figs. 14 (a) and 14 (b) show an embodiment in which the head cracking crack generating device 4 is provided on the outer side and the inner side of the reinforcing bar 2, respectively.

The crack generating device 4 for head cleanings is embedded in the concrete 3 at a position where the concrete is to be cut to clean the head.

As the fluid F flows into the fluid inflow space 43 of the crack generating apparatus 4 for cleansing the head, the first presser plate 41 and the second presser plate 42 are opened and the concrete 3 is cracked C) occurs. The fluid F gradually spreads along the crack surface of the concrete 3 and can generate cracks C both inside and outside the reinforcing net 2. [

Since the concrete (3) at the position to be cut along the crack (C) can be separated, it is easy to clean the tofu.

The fluid F flows into the fluid inflow space 43 through the inflow hole 411 formed in any one of the first pressure plate 41 and the second pressure plate 42.

The inflow hole 411 is connected to the inflow pipe connection port 44 and the fluid F supplied from the inflow pipe 5 flows into the fluid inflow space 43 through the inflow pipe connection port 44 and the inflow hole 411, .

One end of the inflow pipe 5 is connected to the inflow pipe connection port 44 and the other end is exposed to the upper end of the pile 1. [

15 is a sectional view showing a concrete pile provided with a crack generating device for the head cleaning according to the present invention in which a vertical reinforcing bar is provided with a reinforcing steel covering.

15, a reinforcing steel sheath 6 may be formed on the upper portion of the vertical reinforcing bar 21 of the reinforcing net 2 to cover a predetermined distance lower than the expected position of the concrete 3 to be cut.

The fluid F that has infiltrated through the crack surface after the initial cracking occurs in the concrete pile 1 due to the inflow and pressurization of the fluid F flows into the space between the vertical reinforcing bar 21 and the reinforcing steel sheath 6, It is preferable that the height of the lower end of the reinforcing steel sheath 6 is spaced apart from the expected crack surface by a certain distance.

The concrete pile (1) generates a crack (C) at a position where the concrete (3) is to be cut by the crack generating device (4) when the head is cleaned to separate the concrete head. Then, when the separated tofu is lifted and removed, the reinforcing steel sheath 6 prevents the adhesion of the head concrete and the vertical reinforcing bar 21. [ As a result, it is possible to smoothly lift the tofu concrete.

At this time, the reinforcing steel sheath 6 is positioned at a position of the concrete crack C, that is, the position of the crack generating device 4 for the toe theorem 4 so that there is no part where the vertical reinforcing bars 21 and the concrete 3 are adhered in the head concrete And extend to the lower portion of the distance.

16 is a perspective view showing a stepwise process for a concrete pile construction method according to the present invention.

Figs. 16A to 16F show a stepwise process for a concrete pile 1 having a crack generating device 4 for cleansing the head of the present invention described above with reference to Figs. 14 and 15 .

In the concrete pile construction method of the present invention, (a) a reinforcing net 2 is first prepared (Fig. 16 (a)).

The reinforcing net 2 is located in the concrete pile 1 and is formed by assembling a plurality of vertical reinforcing bars 21 and a transverse reinforcing bar surrounding the vertical reinforcing bars 21. [

Next, (b) the crack generating device 4 for cleansing the head is installed on the inside or the outside of the reinforcing net 2 at the position where the pile 1 is to be cut, and the inlet pipe connector 44 and the other end of the inflow pipe 5 is positioned higher than the side where the concrete 3 is to be placed (FIG. 16 (b)).

The inlet pipe connection hole 44 is coupled to the inlet hole 411 formed in any one of the first pressure plate 41 and the second pressure plate 42 constituting the crack generating device 4.

One end of the inflow pipe (5) is coupled to the inflow pipe connection port (44). The other end of the inflow pipe 5 is exposed to the outside of the pile 1 so that the fluid F can be easily injected into the fluid inflow space 43 after the pile concrete is poured.

In the step (b), that is, in the step (a) or the step (b), the reinforcing cloth 6 is placed on the vertical reinforcing bar 21 of the reinforcing net 2 to a distance lower than the predetermined position to cut the concrete 3 Can be put on.

Since the reinforcing steel sheath 6 prevents the adhesion of the head concrete and the vertical reinforcing bars 21, the separated toe concrete can be easily removed later.

16 (c)); (d) placing the concrete 3 at a predetermined height (FIG. 16 (c)); (c) installing a reinforcing net 2 provided with the above- And cured to form a concrete pile 1 (Fig. 16 (d)).

The concrete (3) is poured at a predetermined distance higher than the concrete cutting planned position.

Thereafter, (e) the fluid F is supplied to the inflow pipe 5 to open the first pressure plate 41 and the second pressure plate 42 to form a crack surface in the concrete 3 )).

The fluid F flows into the fluid inflow space 43 to generate cracks C at the inner ends of the first and second pressure plates 41 and 42 or to generate cracks C at the inner ends of the first and second pressure plates 41 and 42, 2 pressure plate 42 is inflated to generate a crack C in the concrete 3.

It is possible to easily separate the head concrete of the pile 1 along the crack surface.

Finally, (f) the separated head concrete is lifted and removed (Fig. 16 (f)).

After the head concrete is separated, the vertical reinforcing bars (21) of the reinforcing net (2) protruding from the upper side of the laying surface become the fixing reinforcing bars of the upper structure.

17 is a perspective view showing a stepwise process for the method of constructing the concrete pile of the present invention when the steel pipe casing is provided.

17 (a) to 17 (d) show a process for a method of constructing a concrete pile according to the present invention when the steel pipe casing 7 is provided.

As shown in FIG. 17, a steel pipe casing 7 may be inserted into the excavation hole for pouring underwater concrete. In this case, in step (d), after the concrete pile 1 is formed, the steel pipe casing 7 is cut under the concrete cutting position.

Specifically, when the casing 7 is provided in the excavation hole, the reinforcing bar 2 is inserted into the casing 7 installed in the excavation hole in the step (c) (FIG. 17 (a)).

In step (d), the concrete 3 in the casing 7 is poured and cured at a predetermined height to form a concrete pile 1 (FIG. 17 (b)).

Thereafter, step (e) is performed in which the crack (C) is generated in the concrete (3) by supplying the fluid (F) to the crack generating device (4). The steel pipe casing is cut at a position lower than a predetermined distance from the concrete cutting expected position, and the cut steel pipe casing is removed (Fig. 17 (c)).

And (f) the tofu concrete separated by the crack (C) is lifted and removed (Fig. 17 (d)).

1: Concrete pile 2: Reinforcing mesh
21: vertical reinforcement 3: concrete
4: crack generating device 41: first pressure plate
411: Inflow hole 42: Second pressure plate
43: Fluid inflow space 44: Inflow pipe end
45: gasket ring 451: cracking tool
46: elastic ring 47: connecting member
471: space maintaining portion 5: inlet pipe
6: Reinforced sheath 7: Casing
C: crack F: fluid
W: Welding

Claims (12)

The concrete pile 1 is embedded in the concrete 3 at the inside or outside of the reinforcing net 2,
A first presser plate 41 and a second presser plate 42 which are vertically provided to each other by a plate ring and in which a fluid inflow space 43 is formed; And
An inlet pipe connection port (44) coupled to the inlet hole (411) formed in any one of the first pressure plate (41) or the second pressure plate (42); And a crack generating device for piling the concrete pile.
The method of claim 1,
Wherein the fluid inflow space (43) is closed on the outer side and the inner side is partially or completely opened.
3. The method of claim 2,
And a gasket ring (45) is provided on an inner end side between the first pressure plate (41) and the second pressure plate (42).
4. The method of claim 3,
And an inner side of the gasket ring 45 is provided with a cracking tool 451 whose outer side is in close contact with an inner end of the first pressure plate 41 and the second pressure plate 42, Crack generator for pile head cleaning.
3. The method of claim 2,
The inner end of the second pressure plate 42 is formed to be longer inward than the inner end of the first pressure plate 41. The end of the first pressure plate 41 is formed to be inclined toward the end of the second pressure plate 42, And a resilient ring (46) which is in close contact with one side surface of the second pressure plate (42) is coupled.
3. The method of claim 2,
Wherein the inner end portions of the first pressure plate (41) and the second pressure plate (42) are inclined and formed as a sharp point as a whole.
3. The method of claim 2,
And the outside and inside of the fluid inflow space (43) are closed.
In a circular concrete pile (1) composed of a reinforcing net (2) and a concrete (3) in which the reinforcing net (2) is embedded,
The crack generating device 4 for head cleaning according to any one of claims 1 to 7 is buried in the inner side or outer side concrete 3 of the reinforcing net 2 at the position where the concrete 3 is to be cut,
Wherein one end of an inlet pipe (5) whose one end is exposed to the upper end of the pile (1) is connected to an inlet pipe connection port (44) of the crack generating device for head cleanliness Concrete piles.
9. The method of claim 8,
Wherein a reinforcing steel sheath (6) is applied to the upper portion of the vertical reinforcing bar (21) of the reinforcing net (2) to a lower portion of a distance lower than a predetermined cutting position of the concrete (3).
A method of constructing a concrete pile (1) provided with a crack generating device (4) for head cleaning according to claim 8,
(a) preparing a reinforcing net (2);
(b) The crack generating device 4 for cleaning the head is installed inside or outside the reinforcing net 2 at the position where the pile 1 is to be cut, and the inlet pipe 5 is connected to the inlet pipe connecting port 44 Placing the other end of the inflow pipe (5) at an upper position than a side to be laid on the concrete (3);
(c) installing a reinforcing net (2) provided with the crack generating device (4) for cleansing the head inside the excavation hole;
(d) placing the concrete (3) at a predetermined height to form a concrete pile (1);
(e) supplying a fluid (F) to the inflow pipe (5) to form a crack surface in the concrete (3) by opening the first presser plate (41) and the second presser plate (42); And
(f) lifting and removing the separated head concrete; Wherein the pile is constructed of a plurality of piles.
11. The method of claim 10,
Wherein the concrete pile is covered with a reinforcing sheath (6) at a distance lower than a predetermined distance from the expected position for cutting the concrete (3) on the vertical reinforcing bar (21) of the reinforcing net (2) Construction method.
11. The method of claim 10,
The steel pipe casing 7 is inserted into the excavation hole and the steel pipe casing 7 is cut from the lower portion of the concrete 3 to be cut after the formation of the concrete pile 1 in the step (d) .

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