KR101674656B1 - CIP retaining wall with steel tube - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth retaining wall for preventing an excavation surface from collapsing by supporting earth pressure and water pressure on an excavation surface at the time of constructing an underground structure, This is about an even more economical and earthworm wall.
Wherein the earth retaining wall comprises in-situ piles constructed in a coherent manner by being connected to one another and a thumb pile disposed at a predetermined distance between the in-place piles and constructed with a depth equal to or greater than the in-situ pile; The thumb pile is composed of a first steel pipe and a filled concrete placed in the first steel pipe, and a plurality of saw-like edges are provided at the tip of the first steel pipe.

Description

{CIP retaining wall with steel tube}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth retaining wall for preventing an excavation surface from collapsing by supporting earth pressure and water pressure on an excavation surface at the time of constructing an underground structure. More specifically, To an improved and cost-effective earth retaining wall.

The CIP (Cast In Placed Pile) method is one of the methods for constructing the earth retaining walls to prevent the ground collapse due to excavation during the excavation work for the construction of the underground structures. It is necessary to use the large excavator such as Earth Auger Depth piercing, and then installing the concrete pile piles continuously in the ground in the perforated pore to form the retaining wall by the main heat type.

This CIP method can be applied to almost all the ground without regard to the ground conditions. When the excavation is completed and the underground structure is constructed, it is possible to construct an underground structure close to the underground outer retaining wall. It is possible to maximize the land use rate by maximizing the building space of the underground structure in the land.

On the other hand, when the groundwater level is high or soft ground is used, the stabilized liquid or steel casing is used to prevent the collapse of the pore wall or the relaxation of the surrounding ground. Steel pipe casings should be installed in the ground at the same time as excavation by earth auger. When the reinforcing steel reinforcement and pouring of concrete are completed, concrete is pulled out before curing and reused.

In order to increase the rigidity of the earth retaining wall, a reinforcing material such as an H-shaped steel is installed in the CIP at regular intervals as shown in FIG. 1, because the excavation of the center core involves an increase in pressure on the back surface of the earth retaining wall by earth pressure and groundwater .

In the case where the excavation is to be performed at a certain depth, the excavation of the rock can not be avoided. If the CIP method is applied to the excavation, the CIP earth retaining wall should be constructed only up to the upper soil layer of the rock, The above-mentioned H-shaped steel or the like is extended to the rock, and the earth retaining wall is formed by sandwiching the soil plate with a thumb pile or a shotcrete is constructed.

However, the above-described H-shaped steel for the purpose of increasing the rigidity of the retaining wall is expensive material and the steel pipe casing can be reused, but time and cost are inevitably incurred due to installation, drawing and dismantling.

In addition, when the steel casing is pulled out of the steel casing, the H-shaped steel is distorted by interference with the H-shaped steel. This phenomenon not only deteriorates the quality of the CIP itself but also makes it difficult to apply the plate to the excavation surface of the rock, In the worst case, the expensive casing of the steel pipe can not be buried in the landfill, which leads to an increase in construction costs such as equipment costs and material costs, as well as a delay in air delays due to poor construction.

On the other hand, the CFT (Concrete Filled Tube) structural member, which is generally used as a column member, not only has excellent resistance to normal stress by restraining the inner concrete by the outer steel pipe, Since the deformation of the steel pipe is suppressed, the resistance against the bending stress is also excellent.

As disclosed in Patent Publication No. 1995-0002434, there has been an attempt to construct a steel pipe-driven type earth retaining wall by filling a steel pipe with a filler as shown in FIG.

The above-mentioned steel pipe retaining type earth retaining wall is formed by filling a steel pipe with open end by vibration hammers so as to fill the steel pipe with soil, thereby forming a steel pipe pile file or reinforcing the reinforcing concrete when the reinforcement is necessary. However, it can be applied only when the rock excavation is not required. However, when it is required to excavate the rock as a large depth, it is impossible to apply it.

On the other hand, the earth auger is excavated and at the same time, the steel pipe casing on its outer side is rotationally press-fitted into the earth, and a bit is mounted outside the tip of the steel pipe to facilitate insertion of the steel pipe casing. However, if a steel pipe casing is used as a steel pipe for a pile to be buried in the ground, expensive bits can not be recovered, which is uneconomical.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the related art as described above, and it is an object of the present invention to provide a cushioning wall which is required to reinforce an inner H- It is an object of the present invention to provide a CIP earth retaining wall using a steel pipe capable of securing excellent performance, economical efficiency and ease of construction by constructing a pile as a steel pipe.

Another object of the present invention is to provide a CIP earth retaining wall which is easy to insert a steel pipe and is economical and easy to install when a steel pipe casing is used as a steel pipe for a thumb pile.

According to a preferred embodiment of the present invention to solve the above-described problems, the present invention provides a method of manufacturing a pile of the present invention, Wherein the thumb pile is composed of a first steel pipe and a filled concrete pouring into the first steel pipe, wherein a plurality of saw-like edges are provided at the tip of the first steel pipe A CIP earth retaining wall using steel pipes is provided.

According to another embodiment of the present invention, the saw-toothed edge provided at the tip of the first steel pipe is constituted by attaching a steel pipe cut portion processed to have a plurality of sawtooth-shaped edges to the lower end of the first steel pipe A CIP earth retaining wall is provided.

According to another embodiment of the present invention, there is provided a CIP earth retaining wall using a steel pipe, wherein the saw blade edge is formed to be inclined outwardly.

According to another embodiment of the present invention, there is provided a CIP earth retaining wall using a steel pipe, wherein reinforcing bars are attached to the inner surface of the first steel pipe.

According to another embodiment of the present invention, there is provided a CIP earth retaining wall using a steel pipe, wherein a plurality of discharge holes are formed in a lower end portion of the first steel pipe.

According to another embodiment of the present invention, a second steel pipe having an outer diameter smaller than the inner diameter of the first steel pipe and having an upper end overlapping with a lower end of the first steel pipe is positioned below the first steel pipe, And the concrete filled in the first steel pipe and the concrete filled in the first steel pipe are filled in the CIP earth retaining wall.

According to another embodiment of the present invention, there is provided a CIP earth retaining wall using a steel pipe, wherein a plurality of through holes are formed at an upper end of the second steel pipe.

According to another embodiment of the present invention, at least three vertical ribs are protruded from the outer surface of the upper end of the second steel pipe to provide a CIP earth retaining wall using the steel pipe.

Since the earth retaining wall according to the present invention is composed of the steel pipe and the filled concrete pushed into the steel pipe, the steel pipe can effectively support the earth pressure because of its excellent rigidity, and the first steel pipe serves as a casing So it is not necessary to perform complicated casing drawing work.

The steel pipe is economical compared to the H-shaped steel of the existing thumb pile. In addition, when the thumb pile of the earth retaining wall is further provided with the second steel pipe, it is a second steel pipe positioned at a stable deep- Since it is possible to use standard steel pipes, it is reasonable from a structural point of view.

The plurality of through holes formed in the upper end of the second steel pipe and the rib protruding from the outer surface of the upper end of the second steel pipe improve the integrity of the first and second steel pipes and reinforce the upper end of the second steel pipe, And the reinforcing bars attached to the inner surfaces of the first and second pipes allow the first and second pipes to have a large strength even when they are formed to have a small thickness.

In addition, the sawtooth edge at the lower end of the first steel pipe makes it easy to insert the first steel pipe.

1 is a cross-sectional view of an earth retaining wall according to a general CIP method.
2 is a cross-sectional view of a conventional heat-activated earth retaining wall using a steel pipe filament.
3 is a perspective view of the earth retaining wall according to the first embodiment of the present invention.
4 is a perspective view of a first steel pipe constituting a thumb pile of the earth retaining wall.
Fig. 5 shows various embodiments of sawtooth edges formed at the lower end of the first steel pipe.
6 is a perspective view of a state in which an earth retaining wall is applied according to a second embodiment of the present invention.
Fig. 7 is an explanatory view of the relationship between the first steel pipe and the second steel pipe in the second embodiment of the present invention. Fig.
FIG. 8 is an explanatory view of a process of constructing a thumb pile in the second embodiment of the present invention. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description of the present invention, however, it is to be understood that the present invention is not limited to the disclosed embodiments.

The present invention relates to an earth retaining wall constructed to support the earth pressure acting on a deformation surface during construction of an underground structure, and in the case where a thumb pile for reinforcing the earth retaining wall is required in order to construct the earth retaining wall to a deep depth, It is possible to secure the economical efficiency and the ease of construction as well as the excellent strength of the reinforcement by using the steel pipe instead of the existing H-shaped steel.

The earth retaining wall according to the present invention comprises an in-situ pile 20 constructed to be connected to each other and installed at a predetermined distance between the piles 20 and at a depth equal to or deeper than the pile 20 Comprising a thumb pile (10); The thumb pile 10 is composed of a first steel pipe 11 and a filled concrete 13 placed in the first steel pipe 11. The tip of the first steel pipe 11 is provided with a plurality of saw blade- E) are provided.

FIG. 3 is a perspective view showing a construction of the earth retaining wall according to the first embodiment of the present invention. FIG. 4 is a perspective view of the first steel pipe 11 constituting the thumb pile 10 of the earth retaining wall according to the embodiment of the present invention. Is shown.

Since the first steel pipe 11 restrains the filled concrete 13 therein, the thumb pile 10 is not only excellent in the resistance against the normal stress, Since the deformation is suppressed, the resistance against the bending stress generated by the horizontal earth pressure is also excellent.

As the first steel pipe 11, it is possible to reduce time and cost for manufacturing a separate material by using the existing casing steel pipe used to prevent the collapse of the pore wall during piercing for pile construction or to relax the surrounding ground can do. Since the first steel pipe 11 serves as a casing during the ground penetration and remains as a structural member after the completion of the piercing, it is possible to omit the intricate casing drawing operation.

At the tip of the first steel pipe (11), a plurality of sawtooth edges (E) are provided.

In order to construct the thumb pile, the first steel pipe (11) is inserted into the ground while rotating the first steel pipe (11) so that the first steel pipe (11) inserted into the ground can be easily inserted into the hole. In the case where the diameter of the hole is smaller than the diameter of the first steel pipe 11 or the adhesion of the earth sand is large and the air wall is easily collapsed, even if the first steel pipe 11 is rotated, This is not easy.

The sawtooth edge E plays a role similar to a bit of an auger or the like for perforation, and enlarges or keeps the diameter of the hole, thereby facilitating the insertion operation of the first steel pipe 11.

The saw-like edge E may be formed to be inclined outwardly as shown in Fig. 5 (a).

Since the end of the saw-like edge E thus formed protrudes outside the outer surface of the first steel pipe 11, a hole larger than the outer diameter of the first steel pipe 11 is formed, So that it can be made easier.

The lower end of the first steel pipe 11 may be machined to have a sawtooth edge E as shown in Figs. 4 and 5 (a) A steel pipe section 11a processed to have a plurality of sawtooth edges E may be attached to the lower end of the first steel pipe 11. [

The steel pipe section 11a may be formed to have a thickness larger than the thickness of the first steel pipe 11 or formed of a steel pipe having greater rigidity than the first steel pipe 11 so that the sawed edge E has a greater It is possible to have a large rigidity.

The steel pipe section 11a is formed to have the same inner diameter as the inner diameter of the first steel pipe 11 and attached to the lower end surface of the first steel pipe 11 as shown in Fig. Is formed so as to have the same inner diameter as the outer diameter of the first pipe (11), and is attached so as to surround the lower end of the first pipe (11) as shown in Fig. 5 (c).

Like edge E formed on the steel pipe section 11a may be formed to be inclined outwardly in the same manner as the saw-like edge E formed directly on the lower end of the first steel pipe 11. [

The sawtooth edge (E) serves to firmly fix the first steel pipe (11) to the ground after the first steel pipe (11) is completely inserted into the hole.

A reinforcing bar 11b may be attached to the inner surface of the first steel pipe 11.

The reinforcing bar 11b reinforces the rigidity of the first steel pipe 11 to enable the use of a thinner steel pipe as the first steel pipe 11 so as to reduce the material cost. Thereby improving the composite force of the filled concrete 13 and the first steel pipe.

A plurality of discharge holes D may be formed in the lower end of the first steel pipe 11.

The discharge hole D allows the concrete to escape to the outside of the first steel pipe 11 and to be grouted in the ground when the filled concrete 13 is poured into the first steel pipe 11. The concrete inside the first steel pipe 11, the inside of the discharge hole D and the ground so that the first steel pipe 11 can be firmly fixed to the ground.

In the case of constructing the thumb pile 10 in a soil section where excavation is easy, it is possible to construct the thumb pile by using only the first steel pipe 11 of the first embodiment, but if the rock is located in the lower part of the ground, It is difficult or impossible.

The second embodiment of the present invention to be described below is applied to a case in which it is difficult to insert the first steel pipe 11 into the lower ground by locating the rock on the bottom of the ground as described above. 6 shows an earth retaining wall according to a second embodiment of the present invention.

In the second embodiment of the present invention, the second steel pipe 12 for constituting the rock pile is located below the first steel pipe 11. That is, a second steel pipe 12 having an outer diameter smaller than the inner diameter of the first steel pipe 11 and having an upper end overlapping with a lower end of the first steel pipe 11 is positioned below the first steel pipe 11, In the second steel pipe 12, concrete filled with the concrete 13 filled in the first steel pipe 11 is filled.

7 shows a perspective view of a second steel pipe according to an embodiment and a coupling relationship between the first steel pipe 11 and the second steel pipe 12. As shown in Fig.

The thumb pile 10 in the second embodiment of the present invention, in which the first steel pipe 11 and the second steel pipe 12 are used together, is formed by a) drilling the ground with an auger or the like, Inserting the first steel pipe 11, b) withdrawing the auger or the like in the hole H2 after drilling the steel pipe to a depth equal to or smaller than the depth of the inserted first steel pipe 11, c) Inserting the second steel pipe 12 into the hole H2 formed at the depth of the steel pipe so that the upper end of the second steel pipe 12 overlaps with the lower end of the first steel pipe 11, And placing the filled concrete (13) in the steel pipe (12). FIG. 8 shows a process of constructing such a thumb pile in order.

For reference, since the second steel pipe 12 is inserted into a stable ground composed mainly of rock, a casing is not required for drilling the hole H into which the second steel pipe 12 is to be inserted.

Since the outer diameter of the second steel pipe 12 is less than the inner diameter of the first steel pipe 11, the second steel pipe 12 is easily inserted into the hole H in the lower portion of the first steel pipe 11 through the space in the first steel pipe 11 . The standard of the second steel pipe 12 is formed to be smaller than the standard of the first steel pipe 11 because the rock steel ground where the second steel pipe 12 is located is stably connected to the first steel pipe 11 ), As well as the earth pressure can be adjusted by adjusting the steel pipe thickness, which is reasonable in terms of structure.

Since the second steel pipe 12 is formed so as to overlap with the first steel pipe 11 in a part of its length, the first and second steel pipes 11 and 12 are connected to each other by the earth pressure acting perpendicularly to the first and second steel pipes 11 and 12, 12 are not easily separated.

On the other hand, since a gap is formed between the excavation surface of the rock and the outer surface of the second steel pipe 12, the second steel pipe 12 may not be stably fixed in the hole H2 formed in the rock surface. This is because the standard of each steel pipe is set so that a clearance is formed between the inner surface of the first steel pipe 11 and the outer surface of the second steel pipe 12 so that the concrete 13 passes through the gap between the excavation surface of the rock and the second steel pipe 12 ). ≪ / RTI >

According to another embodiment of the second steel pipe, a plurality of through holes (P) are further formed at the upper end of the second steel pipe (12).

When the filled concrete 13 is poured into the first and second pipes 11 and 12 through the through-hole P, the filled concrete 13 passes through the first and second pipes 11 and 12, The filled concrete 13 is filled tightly in the space formed between the outer surface of the second steel pipe 12 and the inner surface of the first steel pipe 11, The integrity of the first and second pipes 11 and 12 is improved by the filled concrete 13 communicating with the spaces in the first and second pipes 11 and 12.

According to another embodiment of the second steel pipe, at least three vertical ribs 12a are protruded from the outer surface of the upper end of the second steel pipe 12.

As described above, when a gap is formed between the inner surface of the first steel pipe 11 and the outer surface of the second steel pipe 12, the verticality between the first steel pipe 11 and the second steel pipe 12 is adjusted But also the problem that the gap is biased to one side may occur. This problem can be solved by the vertical rib 12a.

For this purpose, at least three vertical ribs 12a are attached to the outer surface of the second steel pipe 12 at equal intervals. The three or more vertical ribs 12a formed at the same interval are arranged such that the centers of the cross sections of the first and second tubes 11 and 12 are aligned with each other to match the vertical degrees of the first and second tubes 11 and 12 So that the gap formed on the outer surface of the second steel pipe 12 can be formed with a uniform thickness.

The vertical ribs 12a serve to reinforce the overlapped portion between the upper end of the second steel pipe 12 and the first steel pipe 11. [

The vertical rib 12a may be formed in any shape as long as it can function as described above. However, in order to minimize the frictional force generated between the first and second steel pipes 11 and 12, A plurality of vertical pipes 12 are formed on the periphery of the secondary pipe 12 and the lower end of the vertical rib 12a is inserted into the first pipe 11 through the inner space of the first pipe 11, And it is preferably formed obliquely so as not to be caught by the upper end surface of the steel pipe 11. [

The reinforcing bar 11b may be attached to the inner surface of the second steel pipe 12 as in the case of the first steel pipe 11. [ The reinforcing bar 11b attached to the inner surface of the first steel pipe 11 may be vertically formed so as not to interfere with the inserting operation of the second steel pipe 12 when the thumb plate is further provided with the second steel pipe 12 However, the reinforcing steel attached to the inner surface of the second steel pipe 12 may be formed in a vertical shape, a ring shape, or a mixture thereof.

The earth retaining wall according to the present invention may further include a toothed wall 30 formed by shotcrete below the pile 20 between the thumb piles 10, in addition to the above-described structures.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be obvious that various modifications may be made within the scope of the idea. It is therefore intended that such modifications are within the scope of the invention as set forth in the claims.

10: Thumb pile 11: First steel pipe
11a: Steel pipe section 11b: Rebar
12: second steel pipe 12a: vertical rib
13: Filled concrete 20: In-situ pile
D: Exhaust hole E: Saw blade edge
P: Through hole

Claims (8)

And a thumb pile 10 disposed at a predetermined distance between the piles 20 and constructed at a depth equal to or greater than that of the piles 20 in situ, In the retaining wall,
The thumb pile 10 is composed of a first steel pipe 11 having a reinforcing steel bar 11b on its inner surface and a filled concrete 13 placed in the first steel pipe 11, 11 are provided with a plurality of sawtooth-shaped edges E formed to be inclined outwardly,
A second steel pipe 12 having an upper end portion overlapping with a lower end portion of the first steel pipe 11 is positioned in the lower portion of the first steel pipe 11 and an outer diameter of the second steel pipe 11 is less than an inner diameter of the first steel pipe 11, A plurality of through holes P are formed in the upper end of the second steel pipe 12 and a plurality of through holes P are formed in the upper end of the second steel pipe 12, Wherein three or more vertical ribs (12a) are formed on the outer surface of the upper end of the first and second pipes (11, 12) so as to correspond to the center of the cross section of the first and second pipes (11, 12).
The method according to claim 1,
The sawtooth edge E provided at the tip of the first steel pipe 11 is formed by attaching the steel pipe clad 11a processed to have a plurality of sawtooth edges E to the lower end of the first steel pipe 11 Wherein the CIP sheathing wall is formed of a steel pipe.
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