KR20190050342A - Construction method for concrete piles - Google Patents

Abstract

The present invention relates to a cast-in-place construction method, and more particularly, to a construction method of cast-in place continuous pile using a mold for cast-in-place pile. The cast-in-place construction method comprises: a step (a) for inserting an outer casing, while drilling the ground using a punch; a step (b) for installing a mold for cast-in-place pile inside the installed outer casing; a step (c) for withdrawing the outer casing; a step (d) for inserting the outer casing, while drilling the ground using a punch to be in contact with an interface of the auxiliary casing; a step (e) for installing the mold for cast-in-place pile inside the installed outer casing; a step (f) for withdrawing the outer casing; a step (g) for continuously installing the mold for cast-in-place pile by repeatedly performing the step (d) to the step (f); a step (h) for placing concrete inside the inner casing; and a step (i) for filling concrete inside the inner casing while withdrawing the pre-installed a plurality of mold for cast-in-place piles. According to the present invention, after a cast-in-place construction method is performed in a number of times, an auxiliary casing for forming a connection portion with an adjacent pile is only replaced, and an inner casing can be recycled. Therefore, as compared with the case in which the whole casing is replaced, construction costs can be reduced.

Description

{CONSTRUCTION METHOD FOR CONCRETE PILES}

More particularly, the present invention relates to a method of pouring successive piles in a field by using a cast-in-place pile formwork.

The CIP method is to install a reinforced concrete grate column at the site. It installs a casing by drilling a column installation hole, installs a reinforcing bar inside the casing, solidifies it with a column by filling a mortar made of cement, gravel, sand, And the H file is inserted into the column located at a predetermined interval. However, in the CIP method, there is a problem that leakage occurs because the column and the column are not sealed.

1 and 2, one surface of each casing 11 is cut in the longitudinal direction, and the inner and outer surfaces of the cut surface 13 are turned upside down, A method has been developed in which a casing in which an internal arc surface 17 is formed by welding is inserted into a casing installation hole so that the internal arc surface 17 is directed in the advancing direction.

However, the above-described conventional techniques have the following problems.

That is, in the case of using the casing in which the inner and outer surfaces of the incision surface 13 are turned upside down and both side edge surfaces are welded to form the inner raceway surface 17, if the welded portion 15 has a problem such as being worn, The entire casing can not be used.

Further, in the process of releasing the casing, there is a problem that the durability between the concrete pillar and the column is poor due to the concrete not being attached to the welded portion and the inner surface of the casing.

Korean Patent Registration No. 10-0970440

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a field- And to provide a method for casting a pile using the same.

It is another object of the present invention to provide a pile-type pile structure capable of solving the problem of durability of the concrete pile caused by the fact that the concrete is attached to the inner surface of the casing during the process of releasing the casing by using the cylindrical casing. And to provide a method of casting using the mold.

According to an aspect of the present invention for achieving the above object, the present invention includes an inner casing formed of a hollow tube, and an auxiliary casing provided on an outer surface of the inner casing to form a connection portion between adjacent piles .

The auxiliary casing may include a pair of side portions extending from the side surface of the inner casing and a connecting portion connecting ends of the side portions and forming a curved surface contacting the adjacent piles.

And the pair of side portions may be formed to be longer than the distance between the inner ends thereof in contact with the inner casing is longer than the distance between the outer ends.

According to another aspect of the present invention, there is provided an air conditioner comprising: an inner casing formed of a hollow tube; an auxiliary casing provided on an outer surface of the inner casing to form a connection portion between adjacent piles; and a hollow tube in which the inner casing and the auxiliary casing are in contact with each other And an outer casing which is made of a metal.

The auxiliary casing may include a pair of side portions extending from the side surface of the inner casing, and a connecting portion connecting ends of the side portions and forming a curved surface contacting the adjacent piles.

The connecting portion of the auxiliary casing may be formed to have a radius of curvature equal to the curvature of the outer casing.

And the side portion may be formed to have a length such that the inner side surface of the connecting portion is in contact with the outer circumference of the inner casing.

At this time, the pair of side portions may be formed to be longer than the distance between the inner ends of the inner casing and the outer casing.

(A) inserting an outer casing while piercing the ground using a perforator, (b) installing a casting for piling into the interior of the installed outer casing, (c) (D) pouring concrete into the inner casing; and (e) replenishing concrete in the inner casing while withdrawing the dock for the cast-in-place pile.

At this time, before the concrete is poured into the inner casing, it may include a step of compaction of the ground around the mold for the cast-in-place pile.

The step (a) to (e) may be repeated for the ground connected to the concrete pile installed after the step (e).

(A) inserting an outer casing while piercing the ground using a perforator, (b) installing a casting for piling into the interior of the installed outer casing, (c) (D) inserting an outer casing while piercing the ground using a perforator so as to contact with the connecting portion of the auxiliary casing, (e) installing the casting for piling into the inside of the outer casing installed (D) repeating the steps (d) to (f) so as to continuously install the cast-in-place pile formwork, (h) Casting the concrete; (i) replenishing concrete inside the inner casing while withdrawing the plurality of cast-in-place piles for piling.

At this time, before the concrete is poured into the inner casing, it may include a step of compaction of the ground around the mold for the cast-in-place pile.

The step (i) may be simultaneously performed on the plurality of pre-installed cast-in-place piles.

Also, the step (i) may be sequentially performed on the plurality of pre-installed cast-in-place piles.

According to the present invention, since the inner casing can be recycled even if the welded portion of the auxiliary casing is worn after performing the field installation method a plurality of times, the construction cost can be reduced, and the inner casing has a circular cross section There is an advantage that the casting of concrete can be performed smoothly.

As described above in detail, according to the present invention, the following effects can be expected by using a cast-in-place pile formwork and a cast-in-place method using the same.

That is, even after performing the site piling method a plurality of times, it is possible to replace only the auxiliary casing forming the connection portion with the adjacent pile and recycle the internal casing, which is advantageous in that the construction cost can be reduced compared to the case in which the entire casing is replaced.

According to the present invention, since the inner casing has a circular cross-section, the concrete can be prevented from being attached to the inner surface of the casing, have.

1 is a plan view showing a structure of a conventional cast-in-place pile.
BACKGROUND OF THE INVENTION Field of the Invention [0001]
3 is a perspective view showing the construction of a cast-in-place pile formwork according to a specific embodiment of the present invention.
4A to 4C are plan views showing the construction of a mold for a cast-in-place pile according to a specific embodiment of the present invention.
FIGS. 5A to 5F are plan views sequentially showing steps for continuously installing dies for a cast-in-place pile constituting a specific embodiment of the present invention.
FIG. 6A to FIG. 6E are perspective views sequentially showing steps of drawing a form for a cast-in-place pile constituting a concrete embodiment of the present invention by a predetermined height to supplement the auxiliary casing portion.
FIG. 7 is a plan view showing a state in which a cast-in-place pile according to a concrete embodiment of the present invention is installed to construct a wall having an angle; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 4A to 4C are cross-sectional views of an inner casing and a sub-casing of the inner casing, respectively, constituting a specific embodiment of the present invention, an auxiliary casing provided on an outer surface of the inner casing and forming a connection portion with adjacent piles, And FIG.

As shown in FIG. 4A, the inner casing 21 is formed of a hollow tube having a circular cross section. As shown in FIG. 4B, the auxiliary casing 23 is provided on the outer surface of the inner casing 21 in the longitudinal direction to form a connection portion with adjacent piles. As shown in FIG. 4C, the cast-in-place pile formwork 25 according to the present invention includes the inner casing 21 and the auxiliary casing 23.

At this time, as shown in FIG. 4B, the auxiliary casing 23 is composed of a connecting portion 27 and a pair of side portions 29. The connecting portion 27 has the same radius of curvature as the outer casing 31 to be inserted in the adjacent position. Therefore, the connecting portion 27 of the auxiliary casing 23 can be formed by cutting the outer casing 31 in the longitudinal direction. The pair of side portions 29 may be formed as a part of the auxiliary casing 23 together with the connecting portion 27 so as to extend to the side surface of the inner casing 21, And serves to connect the connecting portion 27. At this time, the side portions 29 may be coupled to the inner casing 21 by various joining methods, but they are preferably connected by welding that facilitates field work. Further, the pair of side portions may be formed so that the distance between the inner ends thereof contacting the inner casing 21 is longer than the distance between the outer ends.

The outer casing (31) is formed of a hollow tube in which the inner casing (21) and the auxiliary casing (23) are in contact with each other. The shake pile formwork 25 is constituted by the inner casing 21 and the auxiliary casing 23 and the form casting unit 33 for the excavated pile is connected to the inner casing 21 and the auxiliary casing 23, , And the outer casing (31).

Meanwhile, the auxiliary casing 23 may be provided such that the inner surface of the connecting portion 27 is in contact with the outer circumference of the inner casing 21. That is, the concrete is laid only in the inner casing 21, and the concrete is easily filled in the empty space formed by drawing out the pre-installed cast-in-place pile formwork 25. That is, the volume of the empty space created by the extracted portion of the auxiliary casing 23 of the cast-in-place pile formwork 25 is reduced to smoothly put the concrete into the empty space, This is to reduce the amount of concrete to be replenished while withdrawing the form 25.

The auxiliary casing 23 is constituted by the connecting portion 27 and the pair of side portions 29. The pair of side portions 29 has a distance between the inner end portions in contact with the inner casing 21 May be formed to be longer than the distance between the outer ends. This is because in the step of replenishing the empty space created by the portion of the auxiliary casing 23 of the cast-in-place pile form 25 from which the concrete laid in the inner casing 21 is pulled out, . That is, it is easier and quicker to replenish the concrete to the hollow space than when the distance between the inner end portions contacting with the inner casing 21 is longer than the distance between the outer end portions.

FIGS. 5A to 5F are plan views sequentially showing the step of continuously installing the dies for casting a pile according to a specific embodiment of the present invention.

As shown in Fig. 5A, the outer casing 31 is installed in the casing installation hole. Next, as shown in FIG. 5B, the casting 25 for the cast-in-place pile is installed inside the outer casing 31. At this time, the cast-in-place pile formwork (25) can be installed so as to be inscribed in the outer casing (31). This is to minimize the volume of the empty space when the outer casing 31 is taken out, so that the surrounding soil can be brought into close contact with the casting mold 25 for the cast-in-place pile. However, it is preferable that the above-mentioned cast-in-place pile form 25 is installed so as to be in contact with the outer casing 31 as much as possible, and that the outer casing 31 is installed with a slight space to be taken out at a later stage .

Then, as shown in Fig. 5C, the previously installed outer casing 31 is taken out. Next, as shown in FIG. 5D, the casing installation hole is pierced so as to contact the connecting portion 27 of the auxiliary casing of the submerged pile formwork 25, and the outer casing 31 is installed therein . Then, as shown in FIG. 5E, the above-mentioned cast-in-place pile formwork 25 is installed in the outer casing 31. Next, as shown in Fig. 5F, the previously installed outer casing 31 is taken out.

Hereinafter, a process of forming piles by pouring concrete into the inner casing will be described in detail.

6A to 6E illustrate the steps of withdrawing the dies for piling the shots according to a specific embodiment of the present invention and replenishing empty space created by the concrete poured into the interior casing by drawing out the auxiliary casing portions, FIG.

First, an outer casing 31 is inserted while a ground at a position where a pile is to be formed is punctured, though not shown in the drawing, and the cast-in-place pile formwork 25 is installed in the outer casing 31. When the next outer casing 31 is pulled out, only the formwork 25 for the cast-in-place pile is installed as shown in FIG. 6A. At this time, the ground around the form casting pile for casting 25 is refined so that the surrounding space of the empty space formed by the pulling out of the outer casing 31 replenishes the soil, As shown in Fig. Then, although not shown in the figure, concrete is poured into the inner casing 21 of the cast-in-place pile formwork 25 installed.

At this time, a variety of packing materials such as non-woven concrete, reinforced concrete, solidified soil (soil cement), cement paste, sheet pile, and H file can be placed in the inner casing 21. At this time, the type of the filler is appropriately selected depending on the use of the pile, the support load, and the like. Hereinafter, a case where concrete is installed for convenience of explanation will be described as an example.

Next, as shown in FIG. 6B, the concrete is poured, and after a predetermined period of time, the form 25 for the cast-in-place pile is drawn out by a predetermined height. FIG. 6B is a view showing a state immediately after drawing the mold 25 for the cast-in-place pile. Therefore, the concrete in the portion below the predetermined height from which the dies 25 for the cast-in-place piles are taken out still shows a shape of a cylinder.

Subsequently, as shown in FIG. 6C, an empty space created by the portion of the auxiliary casing 27 of the cast-in-place pile form 25 from which the concrete is drawn out is supplemented. Therefore, the withdrawal of the cast-in-place pile formwork 25 must be performed before the poured concrete is completely solidified.

Next, as shown in FIG. 6D, the cast-in-place pile formwork 25 is drawn out again by a predetermined height. FIG. 6D is a view showing a state immediately after the above-mentioned cast-in-place pile form 25 is taken out again by a predetermined height as in FIG. 6B. Therefore, the concrete just below the cast-in-place pile form 25 still shows the shape of a cylinder.

Subsequently, as shown in FIG. 6E, the concrete replenishes the empty space created by the auxiliary casing 27 drawn out by the predetermined height. By repeating the above steps, the concrete laid in the inner casing 21 is filled not only with the inner casing 21 but also with the auxiliary casing 23 where no concrete is laid. Therefore, by pouring the concrete into the concrete, the pile can have the same shape as that of the cast-in-place pile form 25.

At this time, the concrete consumed for supplementing the portion of the auxiliary casing 27 can be supplemented by further pouring concrete into the inner casing 21 during the repetition of the above steps.

5A to 6E, a method of casting a continuous concrete pile using the cast-in-place pile formwork 25 is as follows.

First, the outer casing 31 is inserted while perforating the ground using a perforator. Then, the above-mentioned cast-in-place pile formwork 25 is installed in the outer casing 31. At this time, the casting mold 25 for the cast-in-place pile may be provided so that the auxiliary casing 23 faces the proceeding direction of the pile construction, so that adjacent piles can be brought into contact with each other.

Next, the outer casing 31 is taken out, and a casing installation hole having the same radius of curvature as that of the connecting portion 27 of the auxiliary casing is drilled in the adjacent ground, and the outer casing 31 is installed. Subsequently, a die (25) for a casting pile is installed in the outer casing (31) so that the auxiliary casing (23) faces the direction of the pile construction.

Then, the same method as described above is repeated to continuously install the cast-in-place pile formwork 25, and when a predetermined number of the cast-in-place pile formwork 25 is installed, concrete is poured into the inside casing 21 do.

Finally, concrete is additionally installed in the inner casing 21 while withdrawing the plurality of cast-in-place piles 25 after a predetermined time. At this time, the reason why the concrete is further laid is that the concrete inside the inner casing 21 replenishes the empty space by the auxiliary casing 23.

The step of further pouring concrete into the inner casing 21 while taking out the plurality of pouring dies 25 for piling out the cast-in-place piling device, ), And may also be performed sequentially.

FIG. 7 is a plan view showing a state in which a cast-in-place pile formwork according to a concrete embodiment of the present invention is installed to construct a wall having an angle.

As in the method of continuously casting the concrete pile using the cast-in-place pile formwork 25, the outer casing 31 is inserted while piercing the ground, When the mold 25 is installed such that the auxiliary casing 23 faces the proceeding direction of the pile construction and the step of pulling out the outer casing 31 is repeated, the mold 25 for the cast- As described above, it is possible to install a cast-in-place pile formwork for constructing a wall having an 'a' shaped angle. At this time, the length of the connecting portion should be appropriately determined according to the direction in which the pile is to be formed.

Hereinafter, a case where the direction in which the pile is formed has a right angle will be described as an example.

If the length of the cross section of the connecting portion 27 is not less than 1/4 of the circumferential circumference of the inner casing 21, the mold 25 for the cast-in-place pile may be formed as a ' It can not be a vertically bent shape. Therefore, in the case where the progressing direction of the pile construction is a vertically bent shape of 'a' shape, the length of the end face of the connecting portion 27 should be less than 1/4 of the circumference of the inner casing 21.

It is necessary to determine the length of the cross section of the connecting portion 27 to be less than a predetermined ratio of the circumferential surface of the inner casing 21 in order to install the cast- have.

It is to be understood that the invention is not limited to the disclosed embodiment, but is capable of many modifications and variations within the scope of the appended claims. It is self-evident.

More particularly, the present invention relates to a method for pouring successive piles in a field by using a pile formwork, and in the present invention, It is possible to replace only the auxiliary casing which forms the connection part with the adjacent pile and to recycle the internal casing, which is advantageous in that the construction cost can be saved as compared with the case where the entire casing is replaced.

11: casing 13: incision surface
15: welding portion 17: inner surface
21: inner casing 23: auxiliary casing
25: Formwork for piling in the field 27: Concatenation of auxiliary casing
29: side portion of the auxiliary casing 31: outer casing
33: Formwork unit for cast-in-place piles

Claims (5)

(a) inserting an outer casing while drilling a ground using a perforator;
(b) installing a cast-in-place pile formwork into the installed outer casing;
(c) withdrawing the outer casing;
(d) inserting an outer casing while piercing the ground using a perforator so as to contact the connecting portion of the auxiliary casing;
(e) installing the cast-in-place pile formwork into the installed outer casing;
(f) withdrawing the outer casing;
(g) repeating the steps (d) to (f) to continuously install the cast-in-place pile formwork;
(h) pouring concrete into the inner casing; And
(i) replenishing concrete in the inner casing while withdrawing a plurality of the cast-in-place piles for the pile installed therein.
The method according to claim 1,
The method of claim 1, further comprising the step of compaction of the ground around the formwork piles prior to pouring concrete into the inner casing.
3. The method according to claim 1 or 2,
Wherein the step (i) is simultaneously performed on the plurality of pre-installed cast-in-place piles.
3. The method according to claim 1 or 2,
Wherein the step (i) is sequentially performed on the plurality of pre-installed cast-in-place piles.
3. The method according to claim 1 or 2,
The sub-
A pair of side portions extending from the side surface of the inner casing;
And a connecting portion connecting the ends of the side portions and being curved to contact the adjacent piles.

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