KR20020033717A - Pile having rotatable tip shoe and method for driving it into the ground - Google Patents

Abstract

PURPOSE: A prebored precast pile provided with a rotary edge shoe is provided to improve the bearing force of the edge of a prebored precast pile and to minimize noise and vibration when driving a pile. CONSTITUTION: The prebored precast pile provided with a rotary edge shoe comprises: a cylindrical pile body(40); a rotary edge shoe(101) coupled to the lower end of the pile body(40) rotatively; and a rotary rod(130) rotating the edge shoe(101).

Description

Pile having rotatable tip shoe and method for driving it into the ground}

The present invention relates to a pre-drilling pile and its construction method, and more particularly, the rotary tip shoe provided at the lower end is pressed into the support layer of the ground while rotating, thereby increasing the tip bearing capacity of the pile, and the noise generated during the pile construction. It relates to a pre-drilling pile and its construction method that can minimize vibration.

Conventionally, as a construction method for embedding piles in the ground, a non-stop method of hitting the pile directly with a hammer to the ground has been used. However, such a non-stop method has a problem that can cause complaints in case of construction in the city, such as noise and vibration occurs during construction.

As a construction method for solving the problems of the direct hitting method, a pre-drilling pile method has been developed. In general, the pre-drilling pile method is to inject the filler into the drilling hole drilled by the auger (auger) and insert the ready-made pile, depending on the method of expressing the bearing capacity is largely divided into immersion method and beating method.

This pre-excavation pile method will be described with reference to FIGS. 1A to 1D and FIG. 2. 1a to 1d shows the sedimentation method, Figure 2 shows the struck method.

In the sedimentation-type pre-excavation pile method, first, as shown in FIG. 1A, the excavation hole 21 is drilled to the ground 20 by a predetermined depth using the auger 10. Next, as shown in FIG. 1B, the auger 10 is removed from the excavation hole 21 while injecting the filler 30 into the drilled excavation hole 21. Then, as shown in FIG. 1C, when the injection of the filler material 30 into the excavation hole 21 is completed, as shown in FIG. 1D, the pile 30 is inserted into the excavation hole 21 into which the filler material 30 is injected. Insert 40).

This sedimentation method has the advantage that it can exclude the noise and vibration generated during the construction of the pile is currently used a lot in Korea. However, some of the slime generated during the drilling of the ground remains on the bottom of the excavation hole, and in this state, the filler is injected and the pile is inserted and hardened, so the pre-drilled pile is placed on the slime and the tip of the pile becomes very fragile. . Therefore, according to the pile construction method by the sedimentation method, the load applied to the pile is mainly supported by the peripheral friction force rather than the tip bearing force, and the bearing force is considerably smaller than the direct hitting method in which the pile is directly hit with a hammer. There is a problem.

On the other hand, the line pile method of the warp method is the same as the immersion method described in Figures 1a to 1d until the process of drilling a drill hole in the ground and inserting the pile into the drill hole. However, in the beating method, as shown in Figure 2, the process of hitting the top of the pile with a hammer 50 so that the pile inserted into the excavation hole can reach the support layer of the lower excavation hole.

In other words, in the case of the beating method, as in the sedimentation method, there is a little slime on the bottom of the excavation hole, but the pile is driven to the support layer of the ground by adding a process of hitting the pile with a hammer, and then injecting filler Thus, the bearing capacity of the pile is considerably larger than in the case of the settlement method.

However, since the hitting method hits the pile with a hammer, there is a problem that the noise and vibration are generated considerably larger than the sedimentation method, although smaller than that of the conventional direct hitting method.

On the other hand, in recent years, a lot of studies have been conducted to increase the bearing capacity of the pre-drilling pile, one of them is a heterogeneous pre-drilling pile method that developed the pre-rigged pile of the warp method.

The above-mentioned release line drilling pile method is a system in which the flow front shoe presses the slime of the bottom of the excavation hole by driving the pile while the flow front shoe is attached to the tip of the pile. This flow tip shoe 60, as shown in Figure 3a, is formed in the shape of a disk having a cross-shaped blade so as to be easily pressed into the slime, it is fixed to the tip of the pile.

Referring to Figure 3b to 3d the construction method of the release line drilling pile is as follows.

First, as shown in Figure 3b, after drilling the drilling hole in the ground 20 with an auger, the hollow pile 40 equipped with the flow tip shoe 60 is inserted into the drilling hole. Next, as shown in Figure 3c, after inserting the hammer 32 in the hollow portion of the pile, hit the flow front shoe 60 with the hammer (32). When the flow front shoe 60 reaches the support layer of the ground 20 by the hammer 32, as shown in Figure 3d, the cement milk 80 is filled in the front end of the pile 40 flows Fix the tip shoe 60 and the pile 40.

However, there is a problem that even in the case of the release pre-drilling pile construction method, the noise and vibration of a considerable size is generated than the conventional warp method.

As described above, despite the various problems, in order to eliminate the occurrence of civil complaints caused by various construction pollutions due to the recent increase in construction in the downtown area, the first digging method that can realize relatively low noise and low vibration compared to the direct hit method Construction of piles continues to increase.

Therefore, there is an urgent need to develop a pre-drilling pile method that solves the problem of reducing the bearing capacity of the submerged construction method and solves the noise and vibration pollution of the construction method.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is to increase the tip bearing capacity of the pre-drilling pile and at the same time minimize the noise and vibration that can occur during the construction of the pre-drilling pile The present invention provides a pre-drilling pile having a rotary tip shoe and a construction method thereof.

Figure 1a is a side cross-sectional view showing a step of drilling a ground to explain the construction method of a conventional pre-drilling pile.

1B is a side cross-sectional view illustrating a conventional method of constructing a pre-drilling pile, drawing auger while putting a filler into a drilled hole drilled into the ground;

Figure 1c is a side cross-sectional view showing a step of completing the filling method in the excavation hole for explaining the construction method of a conventional pre-drilling pile.

1D is a side cross-sectional view illustrating a step of inserting a pre-drilling pile into a drilling hole in which a filler is injected, to explain a construction method of a conventional pre-drilling pile.

Figure 2 is a side cross-sectional view illustrating a conventional method for constructing a pre-drilling pile, the step of driving the pile inserted into the excavation hole with a hammer in the construction of the pre-drilling pile of the swivel method to reach the support layer.

FIG. 3A is a view for explaining a construction method of a conventional pre-drilling pile, and is a perspective view showing a flow tip shoe in a release pre-dig pile method. FIG.

Figure 3b is a side cross-sectional view showing a step of inserting a pile equipped with a flow tip shoe into the excavation hole for explaining the construction method of a conventional pre-drilling pile.

Figure 3c is a side cross-sectional view illustrating a conventional method for constructing a pre-drilling pile, the step of driving the flow front shoe with a hammer through the hollow of the pile.

Figure 3d is a side cross-sectional view illustrating a conventional method for constructing a pre-drilling pile, the filling material is filled after the flow front shoe reaches the support layer.

Figure 4 is an exploded perspective view of the pile according to a preferred embodiment of the present invention.

Figure 5 is a side cross-sectional view of the pile shown in Figure 4 is inserted into the drilling hole drilled in the ground.

6 is a perspective view showing an example of the tip shoe in the pile shown in FIG.

Figure 7a is a side cross-sectional view illustrating the step of drilling the ground as auger for explaining the construction method of the pre-drilling pile according to the present invention.

Figure 7b is for explaining the construction method of the pre-drilling pile according to the present invention, a side cross-sectional view showing a step of drawing the auger while putting the filler in the drilling holes drilled in the ground.

Figure 7c is a side cross-sectional view illustrating a step of inserting a pile having a rotary tip shoe in the excavation hole is filled with filler filling to explain the construction method of the pre-drilling pile according to the present invention.

Figure 7d is for explaining the construction method of the pre-drilling pile according to the present invention, a side cross-sectional view showing a step of coupling the rotary rod to the rotary tip shoe of the pre-drilling pile inserted into the excavation hole.

Figure 7e is for explaining the construction method of the pre-drilling pile according to the present invention, a side cross-sectional view showing a step of rotatable tip shoes to the support layer as the rotating rod rotates.

Figure 7f is for explaining the construction method of the pre-drilling pile according to the present invention, the side cross-sectional view showing the step of injecting cement milk into the hollow of the pile after the pile having a rotary tip shoe to the support layer.

<Explanation of symbols for the main parts of the drawings>

10: auger 20: ground

21: excavation hole 30: filling material

40: hollow pile 50: hammer

60: flow tip shoe 70: pile hollow

80: cement milk 90: support layer

101: rotary tip shoe 102: spiral projection

103: tip shoe upper bolt hole 104: tip shoe upper coupling hole

110: cover 111: bolt bottom cover

120: rubber ring 130: rotating rod

131: rotating rod lower coupling projection 201: rotary tip shoe

202: cylindrical body 203: steel tip assembly

204: beveled steel blade 205: steel horn

206: blade support 207: bolt

208: spiral projection

An object of the present invention as described above comprises a hollow pile body, a rotary tip shoe rotatably coupled to the lower end of the pile body, and rotation driving means for rotationally driving the rotary tip shoe. Rotating tip shoe is achieved by providing a pre-drilling pile, characterized in that the rotational drive by the rotary drive means can be pressed into the support layer.

Here, the rotary tip shoe is made of a shape that is easily inserted into the ground layer when rotated by the rotary drive means, preferably may be conical or streamlined as a whole, the side and bottom of the conical or streamlined body It may be provided with a spiral projection on the surface. Alternatively, the rotatable tip shoe is generally cylindrical and has a steel protrusion that can be embedded in a helical protrusion on the side of the cylinder, and a slime that accumulates in the lower part of the perforated ground at the bottom thereof, and the slime is rotated by the rotating rod. It may be provided with a plurality of inclined steel blades to enter.

A cover is used to rotatably couple the rotatable tip shoe to the pile body, and the rotatable tip shoe is fixed to the lower end of the cover, and the pile body is inserted through the upper cover of the inner diameter larger than the outer diameter of the pile body. Combined. In addition, the rotary drive means, the engaging projection corresponding to the coupling groove of the rotary tip shoe is formed at the lower end, is driven to rotate by a drive source such as a motor, is inserted into the hollow portion of the pile body does not interfere with the pile body It is preferable that it is a rotating rod having a thickness that can be rotated without being. And a sealing means for preventing slime from entering into the gap between the cover and the pile body when the rotary tip shoe is rotated by the rotary driving means while the pile body is inserted through the cover and coupled with the rotary tip shoe. It is preferable to have a.

In addition, an object of the present invention, the step of drilling the ground to a predetermined depth with the auger, drawing the auger while injecting the filling material through the tip of the auger to the drilled excavation hole, the filler is injected into the excavated hole Inserting a pile equipped with a typical tip shoe, inserting a rotary driving means into the pile hollow and snapping the rotary driving means to the rotary tip shoe, and rotating the rotary driving means to rotate and press the rotary tip shoe. A rotary tip shoe is achieved by providing a method of constructing a pre-drilled pile with a rotary tip shoe comprising the step of reaching the support layer and injecting cement milk into the tip of the pile.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

As shown in Figures 4 and 5, the pre-drilling pile according to the present invention, a large-sized hollow pile body 40, the rotary tip shoe 101 is rotatably coupled to the tip of the pile body (40) It is provided.

Rotating tip shoe 101 has a shape suitable to be easily inserted into the ground layer by rotating by the rotary drive means to be described later, in the embodiment shown is formed in a substantially conical shape with a smaller cross-sectional area toward the bottom, the outer peripheral surface The spiral protrusion 102 is formed. On the upper end of the rotary tip shoe 101, a coupling member 104 coupled to the rotary driving means 130 is formed to protrude. In the illustrated embodiment, the coupling member 104 has a cylindrical shape and is formed with a coupling groove 105 to which the tip of the rotation driving means 130 is coupled.

In this embodiment, the spiral tip 102 is formed on the outer circumferential surface of the rotary tip shoe 101, but the rotary tip shoe 101 having a conical shape has been described, but the shape of the rotary tip shoe is limited thereto. If the shape is easily inserted into the ground layer, it may be a streamlined shape, a shape of FIG. 6 or other shape or member to be described later.

On the other hand, in the present embodiment, as a rotation driving means is disclosed a rotating rod 130 having a thickness that can be inserted into the hollow portion of the pile body 40 to rotate without interfering with the pile body. A coupling protrusion 131 corresponding to the coupling groove 105 of the rotary tip shoe 101 is formed at the lower end of the rotary rod 130. The rotary rod 130 is rotationally driven by a drive source such as a motor not specifically illustrated in the drawings.

On the other hand, between the pile body 40 and the rotary tip shoe 101, an upper end is open, and a cup-shaped cover 110 having a through hole formed therebetween. The lower end portion of the pile body 40 is inserted into the cover 110, and the rotary tip shoe 101 is fixed to the lower portion of the cover 110.

That is, a plurality of bolt holes 103 are formed in the upper surface of the rotary tip shoe 101, and bolt holes 111 corresponding to the bolt holes 103 are formed in the bottom of the cover 110, so that the bolts By the rotary tip shoe 101 and the cover 110 is coupled.

In this embodiment, the bolt is used as the fastening means of the rotary tip shoe 101 and the cover 110, but the fastening means is not limited thereto.

The coupling method of the pile according to the present embodiment configured as described above is as follows. As shown in FIG. 5, the cover is first fixed to the rotary tip shoe 101 by, for example, a bolt. Then, in the state in which the rubber ring is inserted into the lower portion of the pile 110 to insert the pile body 40 into the hollow portion of the cover 110 to mount the rotary tip shoe 101 to the pile.

When the pile body 40 is inserted into the cover 110, because the inner diameter of the cover 110 is slightly larger than the outer diameter of the pile body 40, slime may enter the gap between them during construction. Since slime may cause weakening of the tip bearing capacity of the pile, a sealing means for preventing the slime is required.

In this embodiment, the rubber ring 120 is shown by such means. However, the sealing means is not limited to the rubber ring 120.

On the other hand, the coupling groove 105 for transmitting the rotational force between the rotary rod 130 and the rotary tip shoe 101 may be variously changed depending on the shape of the coupling projection at the bottom of the rotary drive means, the rotary rod Grooves are provided at the lower end of the 130 and protrusions may be provided at the top of the tip shoe.

On the other hand, Figure 6 shows another embodiment of the rotary tip shoe.

As shown in FIG. 6, the rotary tip shoe according to the present embodiment includes a body 202 having a cylindrical shape as a whole, a spiral protrusion 208 formed on an outer circumferential surface of the body 202, and a body 202. It is installed in the lower end portion made of a steel tip tip 203 for digging through the slime stacked on the bottom of the excavation hole by the rotation to the support layer. The steel tip 203 has a steel horn 205 protruding from the lower end of the body and a plurality of blades 204 formed obliquely at an angle along the circumference of the steel horn 205. In particular, the steel horn 205 is made of a material having a high strength as a member in case of hitting a rigid strata such as rock in the process of the rotary tip shoe is rotated and pressed to the support layer. Tip tip 203 and cylindrical body 202 may be fastened by bolts 207, for example.

Hereinafter, the construction method of the pre-excavation pile having the above configuration will be described in detail with reference to FIGS. 7A to 7F.

First, as shown in FIG. 7A, the auger 10 is installed at a predetermined position, and the ground 20 is drilled to a predetermined depth while injecting excavating liquid in order to prevent the collapse of the ground. Thereafter, as shown in FIG. 7B, the auger 10 is slowly pulled out while the filler 30 is injected into the excavation hole 21 through the tip of the auger 10.

Next, as shown in FIG. 7C, the pile body 40 on which the rotary tip shoe 101 is mounted is inserted into the excavation hole 21. As shown in FIG. 7D, the rotary rod 130 is inserted through the hollow of the pile body 40 to be coupled with the rotary tip shoe 101. As shown in FIG. 7E, the tip shoe 101 is rotated and press-fitted by rotating the rotary rod 130.

Finally, as shown in FIG. 7F, when the rotary tip shoe 101 is press-fitted to reach the support layer, the rotary rod 130 is removed and the cement milk 80 in the hollow portion of the pile body 40. Inject

Therefore, in the present invention, by rotating and press-fitting the rotary tip shoe 101 using the rotary rod 130 in the construction of the pre-drilling pile to reach the support layer, in the conventional pre-drilling pile This will solve both the tip bearing capacity problem and the noise and vibration problems caused by driving.

As described above, according to the present invention, it is possible to prevent noise or vibration in the existing driving method and to prevent the tip bearing capacity of the pile from being weakened by the settlement method. You can block your possession.

In the above, certain preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. will be.

Claims (8)

It includes a hollow pile body, and a rotary tip shoe rotatably coupled to the lower end of the pile body, The rotary tip shoe is pre-rigged pile, characterized in that the rotation driven by the rotary drive means can be pressed to the support layer of the lower ground perforated. The pre-rigged pile having the rotary tip shoe according to claim 1, wherein the rotary tip shoe has a shape that can be easily inserted into the ground layer when the rotary tip shoe is rotationally driven by the rotary driving means. 3. The pre-excavation pile according to claim 2, wherein the rotary tip shoe has a conical shape as a whole, and a spiral protrusion is formed on an outer circumferential surface thereof. 3. The rotating tip shoe has a cylindrical shape as a whole, a steel horn which is lodged in a slime formed on a helical protrusion on a side thereof and a slime accumulated on a lower part of a perforated ground, and a rotation driving means. Pre-drilling pile having a rotary tip shoe characterized in that a plurality of inclined steel blades are provided to dig into the slime while rotating by. The rotary tip end according to any one of claims 1 to 4, wherein the rotary tip shoe is fixed to the lower end of the cover, and the pile body is inserted through an upper part of the cover having an inner diameter larger than the outer diameter of the pile body. Pre-rigged pile having a rotary tip shoe, characterized in that the shoe is rotatably coupled to the pile main body (40). According to any one of claims 1 to 4, wherein the rotary drive means, the engaging projection corresponding to the engaging groove of the rotary tip shoe is formed at the lower end, is driven to rotate by a drive source such as a motor, A pre-rigged pile having a rotatable tip shoe which is inserted into a hollow part of the main body and has a thickness that can rotate without interfering with the pile body. The sealing means according to any one of claims 1 to 4, further comprising a sealing means for preventing slime from entering into the gap between the cover and the pile body when the rotating tip shoe is rotated by the rotating driving means. Pre-drilled pile with rotary tip shoe. Drilling an excavation hole in the ground to a predetermined depth with an auger; Inserting a pre-drilling pile having a rotary tip shoe to the excavation hole; Inserting the rotary driving means into the pile hollow to pin the rotary driving means to the rotary tip shoe; Rotating the rotary driving means to rotate and press the rotary tip shoe to reach the support layer; And A method of constructing a pre-drilling pile having a rotatable tip shoe comprising the step of injecting cement milk into the hollow of the pile.