KR101148307B1 - Foundation pile - Google Patents

Abstract

PURPOSE: A noiseless and vibrationless foundation pile having an insertion guide head is provided to improve stability because the insertion guide head has a larger diameter than the pile. CONSTITUTION: A noiseless and vibrationless foundation pile having an insertion guide head is composed as follows. Metal shoes(12) are attached on the top and bottom of the foundation pile. An insertion guide head(20) is attached on the bottom shoe. The insertion guide head comprises a main body(22), a plate(24), and reinforcing ribs(26a). The main body has a larger diameter than the foundation pile. The plate is attached on the top end of the main body and transfers the load of the foundation pile to the insertion guide head. The reinforcing ribs are attached on the bottom of the plate and the inner surface of the main body and support the plate and the main body.

Description

Noise-free vibration-free foundation piles with induction induction heads {Foundation Pile}

The present invention relates to a foundation pile to be installed in the ground in order to secure the support of the ground when installing the building and civil engineering structures, and more specifically, to the design depth by attaching a tubular induction head to the tip of the pile The present invention relates to a noiseless vibration-free foundation pile having a root induction head which facilitates root entry.

The pile method is to inject deep steel (STEEL), concrete, wood, etc. deep into the ground so that the foundation is supported in a very hard deep layer. At this time, an important consideration in the design is the construction of ground strata, which should facilitate the penetration of piles in the middle soils and ensure the bearing capacity of pile ends.

However, when the gravel amber stone layer is thickly deposited like the adjacent river basin, it is difficult to infiltrate the pile due to the blow, so it is difficult to use it as a support layer for the tip of the sand and gravel layer. Apply the site pile method to punch the concrete and punch it in advance.

However, this method has an uneconomical aspect such as a large settlement amount in the pile size (section area), the foundation ground is relaxed, the friction around the pile is greatly reduced, and the bearing capacity of the ground is insufficient, so that the strength of the pile body is insufficient. .

To overcome this drawback, the method introduced is a Soil Cement Injection Precast pile (SIP) or Double Road Auger (DRA) based method.

The SIP method is a method of digging and drilling the bit to the support base by rotating the auger, injecting the mixed cement milk while drawing the auger, and then inserting the pile to the support base. The DRA method uses the internal auger and the casing auger together It is a method that drills the ground, draws the inner auger, injects the mixed cement milk, enters the pile, and finally draws the outer casing auger.

These methods are proposed as a low noise and low vibration method in urban areas. In recent years, the frequency of use is increasing in riverbed sedimentary areas, which are difficult to penetrate by direct hitting. After curing, the strength of the surrounding strata is increased to greatly increase the frictional force around the pile, and the cement milk is also completely filled at the distal end, thereby minimizing the settlement of the pile.

By the way, the pile to be infiltrated into the cement milk filled in the excavation hole is applied by pushing the pressure into the gap between the pile and the excavation hole, not only the entry is not smooth by the resistance generated at this time, but also the hollow wall of the excavation hole If it is collapsed, it is more difficult to access the pile by resistances such as amber stones included in the collapsed hollow wall.

As the access of the pile becomes difficult, the forced intrusion is induced by smashing the head government of the pile. As the empty wall collapses, cement milk filled with resistances such as amber stones or sand contained therein is filled. Due to the sponge phenomenon, the intrusion becomes difficult, and a strong strike is applied, which causes a lot of noise and damage to the pile, and eventually abandones the induction to the design depth, thereby making it difficult to secure ground support. Will cause side effects leading to poor construction.

Invented in order to solve the conventional problems of the present invention, a smooth pile by minimizing the resistance of the cement milk filled in the interior of the excavation hole or the resistance such as amber stone contained therein due to the collapse of the excavation hole of the excavation hole at the tip of the pile The purpose of the present invention is to provide a noiseless vibration-free foundation pile having an induction induction head that does not need a swivel for the intrusion of the pile.

In addition, another object of the present invention to achieve a larger outer diameter than the pile to improve the stability and ground support of the foundation.

Noise-free vibration-free foundation pile having a near induction head according to the present invention for achieving the above object,

In the foundation pile formed by attaching a shoe communicating with the hollow part in the upper and lower parts,

A plate communicating with the hollow part is attached to the lower shoe of the foundation pile,

Attach the induction head body of the cylindrical steel pipe having an inner diameter larger than the outer diameter of the foundation pile to the lower portion of the plate,

Forming a plurality of through holes penetrated up and down of the induction head body in the plate,

Reinforcing by attaching a conical reinforcement or dispersion reinforcement to the bottom surface of the plate and the inner wall surface of the induction induction head body,

A plurality of negative pressure reducing holes are formed in the circumference of the induction induction head body.

In addition, an auxiliary guide is installed around the induction induction head body to assist in maintaining a straight state when descending.

The noise-free vibration-free foundation pile having the induction induction head of the present invention has a tubular induction induction head welded to the lower end, so that the incidence of the induction induction head penetrates the cement milk during the intrusion. The small contact area improves permeability and enables effective incorporation even if there is a resistance such as amber in the mixed cement milk. Once the induction head penetrates the cement milk, Cement milk has the advantage of ensuring the straightness.

In addition, because it is easy to move in, it is possible to move up to the desired design depth by its own weight, even if no strike is applied. Therefore, noise and vibration do not occur due to the strike, and it is possible to prevent damage to the pile and to secure accuracy in measuring the bearing capacity of the pile. have.

In addition, the outer diameter of the induction head is larger than the pile to improve the stability and ground support, and further reduce the design work of the pile, ultimately has the advantage of reducing the construction cost and shorten the air.

Figure 1 is a perspective view of the separation and coupling showing the structure of a noiseless vibration-free foundation pile having a near induction head according to the present invention.
Figure 2 is an enlarged half sectional perspective view of the main portion for explaining the reinforcement structure of the induction guide head of the present invention pile.
Figure 3 is an enlarged half sectional perspective view of the main portion showing an embodiment of the reinforcing structure of the induction guide head of the present invention pile.
Figure 4 is an enlarged cross-sectional view of the main portion for explaining the reinforcement structure of the induction guide head of the present invention pile.
5 is an enlarged half sectional perspective view of a main portion showing an embodiment of the reinforcing structure of the induction head of the foundation pile of FIG. 3;
Figure 6 is an enlarged perspective view of the main portion of the state in which the penetration protrusion structure is added to the induction guide head of the foundation pile.
Figure 7 is a construction process diagram of a noiseless vibration-free foundation pile having a near induction head according to the present invention.
Figure 8 is an enlarged view of the construction of the root in the noise-free vibration-free foundation pile having a root induction head according to the present invention.
Figure 9 is a pile cross-sectional structure of the type of the outer diameter of the root induction head according to the invention larger than the pile.
10 is a cross-sectional view showing a structure having a through hole in the upper plate of the induction induction head of FIG.
11 is a cross-sectional view showing a state in which the present induction head is fixed to the foundation pile by bolts.
Figure 12 is an exemplary view showing a state in which the auxiliary guide is installed in the induction guide head of the present invention.

The structure of the noiseless vibration-free foundation pile 10 having the induction induction head 20 of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the noiseless vibration-free foundation pile having the indentation induction head of the present invention includes a foundation pile 10 equipped with metal shoes 12 at both upper and lower ends, and a lower shoe 12 of the foundation pile 10. It is composed of a root induction head 20 attached to the fixed).

The induction guide head 20 constitutes a main body 22 made of a cylindrical steel pipe having the same diameter or larger than that of the foundation pile 10, and as shown in FIGS. 2 to 5, the lower end of the foundation pile 10. The plate 24 which is attached to the upper end of the main body 22 in contact with the foundation pile 10 and transmits the load of the foundation pile 10 to the induction induction head 20 is welded and fixed. Reinforcing bars 26a and 26b attached to the lower part of the plate 24 and the inner wall surface of the main body 22 to support the plate 24 and the main body 22 are provided. Here, the shoe 12 and the plate 24 form holes 12 'and 24', respectively, in the center thereof, which communicate with the hollow portion 14 of the foundation pile 10.

The reinforcing bar 26a is a conical reinforcing bar 26a which is rolled into a conical shape as shown in FIGS. 2 and 4, and the upper end is in close contact with the inner wall surface of the main body 22 and the lower end is in contact with the inner wall surface of the body 22. 3 and 5, it is possible to simply attach the distributed reinforcement bar 26b for welding and fixing the general reinforcement bar 26b having a triangular shape at regular intervals.

The conical reinforcement 26a rolled in the conical shape guides the pressure of the cement milk 50 to the inside of the pile 22 by the indentation pressure when the pile is inclined by its inclined surface to the inside of the pile to prevent negative pressure resistance. It performs the function of minimizing.

In addition, the root induction head 20 may be attached to the shoe 12 of the foundation pile 10 by welding, or may be attached by bolting as shown in FIG. Particularly, in the case of bolt coupling, the bolt hole H is formed in the shoe 12 of the plate 24 and the corresponding foundation pile 10 to match the bolt hole H, and then the bolt B at the bottom of the induction guide head 20. Will be attached by tightening.

9 and 10, the lower end of the foundation pile 10 may be connected to the root induction head 20 having a larger outer diameter than the foundation pile 10. At this time, since the diameter of the induction induction head 20 to be attached is larger than the foundation pile 10, it can be reinforced by adding an expansion type reinforcement plate to connect it.

Therefore, the shape of the overall foundation pile 10 has a large lower shape and structurally stable. When the foundation pile 10 of this type is entered into the excavation hole 40 and the induction induction head 20 is cured in a state of digging into the cement milk 50 below the excavation hole 30, the induction induction head 20. Cement milk 50 is filled into the interior or exterior of the body to form a body, so that it is possible to secure the stability of the foundation pile 10 as well as to secure a high ground support. That is, since the ground support capacity is improved compared to the basic piles of the same type, it is possible to reduce the number of foundation piles in the design, thereby reducing the basic material cost and construction cost, reducing the air, improving the construction capacity, and stability of quality.

Also, as shown in FIG. 10, a plurality of through-holes 25 are drilled up and down in the plate 24 of the induction induction head 20 exposed to the outside by having an outer diameter larger than that of the foundation pile 10, and then moved into the interior by indentation. Filling cement milk 50 may be passed through the through hole 25 to minimize the negative pressure.

In addition, a plurality of negative pressure reduction holes 28 are formed around the main body 22 of the induction induction head 20. The negative pressure reduction hole 28 serves to lower the negative pressure by inducing outflow of the cement milk 50 introduced into the body 22 to the outside when entering the circumference of the body 22.

In addition, as shown in FIG. 6, a plurality of penetration protrusions 29 are formed around the lower end of the main body 22 so that the cement milk 50 can be more easily dug in when entering.

Looking at the construction process of the noise-free vibration-free foundation pile having the present invention induction head as described above is as follows.

As shown in FIG. 7A, the auger 30 is rotated to excavate the excavation hole 40 vertically to the support base of the design ground layer. At this time, in the case of the DRA method, the inner auger and the casing auger are simultaneously rotated and excavated.

When the excavation is completed to the design depth, the mixed cement milk 50 is injected while drawing the auger 30 as shown in FIG. At this time, care should be taken not to cause the phenomenon that the ball wall 42 of the excavation hole 40 collapses. In the case of the DRA method, the cement milk 50 is injected while drawing the inner auger.

When the extraction of the auger 30 is completed, as shown in FIG. 7C, the noiseless vibration-free foundation pile 10 having the present invention ingress induction head 20 is driven into the excavation hole 40.

The foundation pile 10 to be recessed excavates the cement milk 50 filled with the lower end of the main body 22 of the root induction head 20 attached to the lower end thereof. At this time, the tip end of the induction induction head 20, the end of the tubular shape, as shown in Figure 4 in the structure in which the penetration protrusion 29 is formed, even if there is a resistance such as amber stone mixed in the cement milk 50, while digging while moving it in and out The penetration efficiency is improved. In addition, after the induction induction head 20 is penetrated into a certain depth, the cement milk 50 is in close contact with the outer circumferential surface of the main body 22 and at the same time, so that the induction straightness can be maintained continuously.

When the surface of the cement milk 50 is filled in the inner space of the induction induction head 20, as shown in Fig. 7 (C) and 8, a part of the cement milk 50 is hollow part of the foundation pile 10 ( 14) and the other part rises up into the space between the foundation pile 10 and the ball wall 42 of the excavation hole (40). In particular, the conical reinforcing bar 26a attached to the upper end of the main body 22 of the root induction head 20 reduces the negative pressure of the cement milk 50 rising up by the inclined surface, thereby reducing the hollow portion 14 of the foundation pile 10. Guide). In addition, when the negative pressure inside the main body 22 of the induction induction head 20 increases, it is leaked to the outside through a plurality of negative pressure reducing holes 28 drilled around the main body 22 to reduce the negative pressure. It is smoothly entered to the design indentation depth by self weight. When the access is completed, the cement pile 50 is filled by filling the space between the foundation piles 10 and the excavation hole 40. In addition, when the cement milk 50 is cured, the cement milk 50 inside and outside the main body 22 is connected through the negative pressure reducing hole 28 to form an integrated structure, thereby ensuring a firm supporting force.

On the other hand, in the case of the DRA method, after the entry of the foundation pile is completed, the casing auger is drawn from the excavation hole 40, and the cement milk 50 is filled in the space between the foundation piles 10 and the excavation hole 40 to finish. .

12 is an exemplary view showing a state in which an auxiliary guide is installed in the induction induction head of the present invention, the auxiliary guide 60 is installed in the negative pressure reduction hole 28 as shown in the drawing when the induction induction head 20 is lowered Reinforce straightness.

The auxiliary guide 60 is formed to have a larger area than the negative pressure reducing hole 28, and forms a slot 61 at a lower portion thereof so that the auxiliary guide 60 may be caught at an end of the negative pressure reducing hole 28, and the negative pressure reducing hole 28 is disposed at an upper portion thereof. ) So that it can be attached by installing the hook (62) that is elastically engaged. The auxiliary guide 60 is formed to be in contact with the surface of the excavation hole 40 by forming a long curved magazine zone 63 in the direction of the excavation hole 40 surface during installation. In addition, the auxiliary guide 60 penetrates through the hole 64 communicating with the negative pressure reducing hole 28 so that it can flow out when negative pressure is generated so that smooth indentation can be made and the inner and outer cement milk of the main body 22 after curing. The 50 is integrally connected to ensure a solid support force.

Therefore, the cradle zone 63 of the auxiliary guide 60 is brought into close contact with the surface of the excavation hole 40 so that the rectification guide head 20 is always positioned at the center of the excavation hole 40 when the entry guide head 20 descends. There is an effect to improve.

10: foundation pile 12: shoe 14: hollow part
20: induction head 22: body 24: plate
26a, 26b: reinforcing bar 28: negative pressure reducing hole 29: penetration projection
30 Auger 40 Excavation 42 42 Wall
50: cement milk 60: auxiliary guide 63: bullet belt

Claims (2)

In the foundation pile 10 in which the shoe 12 which has the hole 12 'which communicates with the hollow part 14 in the upper part and the lower part is attached and comprised,
A plate 24 having a hole 24 ′ communicating with the hollow portion 14 is attached to the lower shoe 12 of the foundation pile 10, and an inner diameter of the foundation pile 10 is disposed below the plate 24. Attaching the main body 22 of the cylindrical steel pipe larger than the outer diameter of the upper and lower ends, and forming a plurality of through holes 25 penetrating the upper and lower parts of the main body 22 in the plate 24, and the bottom surface of the plate 24. Reinforcing by attaching conical reinforcing bar 26a or distributed reinforcing bar 26b to the inner wall surface of the main body 22, and forming a plurality of negative pressure reducing holes 28 around the main body 22, and excavating hole 40 Noise-free vibration-free foundation pile having a near-induction guide head characterized in that it is provided with an auxiliary guide (60) is formed in contact with the surface to maintain a straight state when the main body (22) descends. delete

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