KR102472139B1 - Cutting arms for forming reinforced apparatus of piles and construction method of piles with reinforced apparatus - Google Patents

Abstract

The present invention relates to cutting arms for forming an extended tip reinforcing part of a pile and a method for constructing a pile with an extended tip reinforcing part, which can obtain a bearing capacity greater than that of existing piles without driving a pile into a supporting ground by seating the tip of the pile on an upper portion of an extended tip reinforcing part formed by rotating and driving the cutting arms with discharge portions into the supporting ground in the ground, cutting and pulverizing the ground, and mixing an injection material. The cutting arms for forming an extended tip reinforcing part of a pile are provided below a rotationally driving rod rotationally driven into the ground to construct the extended tip reinforcing part formed on the supporting ground in the ground to support the bottom of the pile, to protrude outward. At least two or more cutting arms are provided. The turning radius thereof is greater than that of the tip of the pile. An injection material supply path is provided inside or outside the cutting arms in a longitudinal direction. Sides of the cutting arms have the discharge portions for injecting the injection material into the pulverized surrounding ground in communication with the injection material supply path. The discharge portions of the cutting arms have a foreign matter inflow prevention part for closing the discharge portions until the injection material is injected and for opening the discharge portions when the injection material is injected.

Description

Cutting arms for forming expanded end reinforcement part of pile and pile construction method having expanded end reinforcement part {Cutting arms for forming reinforced apparatus of piles and construction method of piles with reinforced apparatus}

In the present invention, a cutting arm equipped with a discharge part is rotated into the supporting ground of the ground to cut and pulverize the ground, and by seating the tip of the pile on the upper part of the expanded tip reinforcement part formed by mixing the injection material, without penetrating the pile to the supporting ground. The present invention relates to a method for constructing a pile equipped with a cutting arm and an expanded end reinforcement part for forming an expanded end reinforcement part of a pile that can obtain a greater bearing capacity than existing piles.

Drilled piles such as PHC piles or cast-in-place piles have a very deep drilling depth because they drill the ground up to the bedrock to secure tip bearing capacity. Since the casing installed to protect the hole wall during the ground drilling process is difficult to penetrate to the depth of the rock mass, a pneumatic compressor is used together with the casing to prevent the hole wall from collapsing during the drilling operation, and the excavated soil is discharged with compressed air to perform the drilling operation. Conduct.

However, even if the excavated soil is discharged with compressed air, it is unavoidable that slime is accumulated due to the excavated soil at the bottom of the drilling hole.

Therefore, even if the drilling hole is drilled to the rock layer, the pile is not directly supported on the rock, but is placed on the excavated slime at the bottom of the drilling hole, so the bearing capacity of the pile is greatly reduced and long-term settlement occurs.

Cast-in-place piles have the advantage that there are almost no civil complaints due to noise or vibration during construction, but it is impossible to put them on during construction. Therefore, the tip bearing capacity cannot be expected, so it can only be used as a friction pile.

PHC piles, which are ready-made piles, have limited bearing capacity because the excavated slime at the tip of the pile is only hardened even if it is pounded after pile construction.

On the other hand, there is a helical pile as a representative example of a pile constructed by press fit or rotational penetration.

The helical pile has about three helixes, which are helical disks, at regular intervals on the outer circumferential surface of the pile body. The helical pile is constructed by rotating the pile into the ground and then filling the inside of the pile with cement grout. The tip bearing capacity directly supported by the spiral disc when a load is applied and the cylindrical shape between the upper and lower spiral discs when the compression or pulling force is applied after construction is applied. The bearing capacity is demonstrated by the circumferential frictional force developed between the ground and the adjacent ground.

These helical piles have low noise and vibration and are excellent in economic feasibility and workability, so they are widely used for foundation reinforcement in new construction or remodeling construction.

Helical piles are usually installed in small-scale equipment such as backhoes with hydraulic equipment to rotate penetration into the ground. Therefore, the length of the pile is often limited to within 3m, and a number of helical piles are connected and used according to the depth of penetration. When helical piles are used for building support, helices with diameters ranging from 200 to 350 mm are usually used. At this time, the helix located at the bottom needs to be supported on a hard rock layer higher than the weathered rock, but it is difficult to secure the pile bearing capacity because it is difficult to insert the tip of the pile to the weathered rock when the helix is provided. In addition, when a helical pile with a small diameter is used in the stratum passing through the soft stratum, there is a risk of buckling of the helical pile.

In addition, the conventional micropile has higher reliability for the pile bearing capacity than the helical pile. On the other hand, since the micropile is constructed after drilling the ground, a separate drilling machine is required, and a treatment process for floating soil generated during drilling is required, which is cumbersome and requires a lot of construction cost.

In addition, the micropile requires a casing for protecting the hole wall in the soft ground section, such as weathered soil, and thus is less economical, and since a drilling hole must be formed in the weathered rock larger than the diameter of the micropile, hammer strikes are unavoidable and there is a risk of civil complaints.

KR 10-2007-0014547 A1

In order to solve the above problems, the present invention is provided at the bottom of the rotary penetration rod penetrating into the ground, and the cylindrical pile expanded tip reinforcement for supporting the tip of each pile by cutting and pulverizing the ground and mixing the injection material. It is intended to provide a construction method of a pile equipped with a cutting arm and an enlarged tip reinforcement for forming.

The present invention according to a preferred embodiment is the expanded end reinforcement of the pile provided to protrude outward from the lower part of the rotary penetration rod that is rotated into the ground to construct the expanded end reinforcement part formed on the support ground in the ground and supporting the lower part of the pile. It relates to a cutting arm for forming a part, wherein at least two or more cutting arms are provided, a radius of rotation is larger than that of the tip of the pile, and an injection material supply path is provided inside or outside in the longitudinal direction, and one side is provided with the A discharge part is formed for injecting the injection material into the pulverized surrounding ground in communication with the injection material supply passage, and a foreign matter inflow prevention part is formed in the discharge part of the cutting arm to close the discharge part until the injection material is injected and to open the discharge part when the injection material is injected. It is provided, but the foreign matter inflow prevention part is formed in the form of a pipe that can slide inside the injection material supply path, and an injection hole is formed at a position corresponding to the discharge part. , When the injection material is injected, the injection hole coincides with the discharge portion to provide a cutting arm for forming the expanded tip reinforcement portion of the pile, characterized in that the discharge portion is opened.

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According to another preferred embodiment of the present invention, the discharge part is formed long in the longitudinal direction of the cutting arm by cutting one side of the cutting arm, and the injection hole is formed long in the longitudinal direction of the foreign matter inflow prevention part by cutting one side of the foreign matter inflow prevention part. The cutting arm for forming the enlarged tip reinforcement part of the pile, characterized in that the foreign matter inflow prevention part is provided to be rotatably movable inside the injection material supply path and matches the position of the injection hole and the discharge part by rotating the foreign matter inflow prevention part. provides

The present invention according to another preferred embodiment provides a cutting arm for forming a reinforced end portion of a pile, characterized in that the cutting arm is a steel pipe or steel bar having a plurality of grinding tips outside.

The present invention according to another preferred embodiment provides a cutting arm for forming an enlarged tip reinforcement portion of a pile, characterized in that the cutting arm is formed thinner toward the outside.

The present invention according to another preferred embodiment provides a cutting arm for forming an enlarged tip reinforcement portion of a pile, characterized in that the discharge portion is formed so that the discharge area increases toward the outside of the cutting arm.

The present invention according to another preferred embodiment is for constructing a pile to be seated on the upper part of the enlarged tip reinforcement formed using the cutting arm, (a) rotating the rotary penetration rod to cut the cutting arm under the rotary penetration rod. Reaching the top of the supporting ground; (b) Rotating the rotary penetration rod to cut and pulverize the support ground with a cutting arm to a diameter larger than the tip of the pile, while injecting and mixing the injection material into the cut and pulverized support ground through the discharge unit to form a cylindrical shape. Forming an enlarged tip reinforcement part; (c) recovering the rotary penetration rod equipped with the cutting arm to the ground; And (d) constructing a pile so that the tip of the pile is mounted on the upper surface of the expanded tip reinforcement part; It provides a construction method of a pile equipped with an enlarged tip reinforcement, characterized in that consisting of.

In the present invention according to another preferred embodiment, in the step (a), after the cutting arm provided in the rotary penetration rod reaches the top of the support ground in a state where the discharge part is closed by the foreign matter inflow prevention unit, the step (b) In the step, the injection material is injected through the discharge portion while cutting and pulverizing the support ground in a state in which the discharge portion is opened by the foreign matter inflow prevention portion.

In the present invention according to another preferred embodiment, in the step (b), the enlarged tip reinforcement unit injects the injection material while penetrating the cutting arm downwardly, or injects the injection material while upwardly rotating the cutting arm after penetrating the cutting arm downward, or Provided is a method of constructing a pile equipped with an enlarged tip reinforcement, characterized in that the primary formation is performed by injecting the injection material while rotating downward and then the secondary formation is performed by injecting the injection material while rotating upward.

In the present invention according to another preferred embodiment, in the step (d), the location of the expanded tip reinforcement portion in the ground is identified using a three-dimensional surveying system, and then the location of the expanded tip reinforcement portion is determined while monitoring the location of the tip end of the pile in real time. Provided is a method for constructing a pile equipped with an enlarged tip reinforcement, characterized in that the pile is installed so that the tip is mounted.

In the present invention according to another preferred embodiment, an injection material transfer path for transporting the injection material to the injection material supply path is provided inside the rotation penetration rod, so that the injection material is connected to the injection material transfer path in step (b) of the rotation penetration rod. It provides a construction method of a pile equipped with an enlarged tip, characterized in that supplied by the injection material receiving portion coupled to the outside of the top.

In the present invention according to another preferred embodiment, an injection material conveyance path for transporting an injection material to an injection material supply path is provided inside the rotary intrusion rod, an injection material accommodating part is provided in the workplace on the ground, and the injection material conveyance path and the injection material accommodating part are connected. Connected by a pipe, providing a method for constructing a pile with an enlarged tip, characterized in that the injection material is injected while the connecting pipe is wound around the outer circumferential surface of the upper end of the rotary penetration rod during rotation of the rotary penetration rod in step (b) do.

According to another preferred embodiment of the present invention, an injection material receiving portion is provided at a certain height from the cutting arm inside the rotary penetration rod, and an injection material transfer path connecting the injection material accommodation portion and the injection material supply path is provided inside the rotation penetration rod. Provided, in step (b), after the injection material is injected into the injection material receiving unit, the injection material is supplied through the injection material transfer path.

According to the present invention, there are the following effects.

First, since the expanded tip reinforcement formed in the original ground serves as an expanded foundation for individual piles, even if the pile does not penetrate into the weathered rock, it has a greater allowable vertical bearing capacity than a pile constructed by drilling into the rock mass or a press-fitting ready-made pile or helical pile inserted into the rock mass. can exert

Second, when a rotary penetration type pile such as a helical pile is seated on the upper part of the expanded tip reinforcement formed in the ground, sufficient allowable vertical bearing capacity can be secured with only one helix with a large diameter. Accordingly, it is possible to reduce the cost of attaching the support steel plate as well as the pile penetration resistance.

Third, since the depth of the pile construction is not deep, the casing can be directly seated on the extended tip reinforcement part, so it is possible to construct the pile while preventing the inflow of groundwater. In addition, since the slime on the floor of the drilling hole can be completely removed, the drilling pile constructed after drilling the drilling hole, such as a cast-in-place pile or a PHC pile, can secure the same bearing capacity as a pile constructed in the rock base.

Fourth, it is economical because it is used as the main material by cutting and crushing the support ground to form the expanded tip reinforcement part in the ground, and it is constructed with the non-casting rotation penetration method, so the site is clean, and there is little noise and vibration, so there is little concern about civil complaints. none.

Fifth, since the discharge part formed on the cutting arm injects the injection material in an amount corresponding to the shared volume of the original ground to be strengthened, there is no fear of pulsation injection, and thus a reliable expanded tip reinforcement part can be formed.

Sixth, construction is possible regardless of changes in groundwater or stratum conditions due to the foreign matter inflow prevention unit that opens the discharge unit when the supporting ground is reached.

1 is a perspective view showing a rotary penetration rod equipped with a cutting arm.
Figure 2 is a side view showing an embodiment provided with a penetrating member;
3 is a perspective view showing an embodiment provided with a screw;
Figure 4 is a cross-sectional view showing a cross-section of Figure 3;
5 is a view showing an enlarged tip reinforcement part formed by a cutting arm.
6 is a view showing a state in which piles are installed on the upper part of the enlarged tip reinforcement part.
7 is a perspective view showing an embodiment in which two screws are continuously provided.
8 is a perspective view showing an arrangement of a discharge unit formed on a cutting arm;
9 is a perspective view showing an embodiment provided with a cutaway type discharge unit;
10 to 12 are cross-sectional views illustrating a cutting arm having a foreign material inflow prevention unit in a discharge unit.
13 is a view showing the state of the foreign matter inflow prevention unit when the discharge unit is closed.
14 is a view showing the state of the foreign matter inflow prevention unit when the discharge unit is opened.
15 and 16 are cross-sectional views showing the working relationship of the foreign matter inflow prevention unit by the pressing wedge.
17 and 18 are cross-sectional perspective views illustrating an operational relationship by rotation of a foreign substance inflow prevention unit when the incision type discharge unit is provided.
Fig. 19 is a perspective view showing an embodiment in which a cutting arm is a steel bar;
Fig. 20 is a cross-sectional view showing the cross section of Fig. 19;
Fig. 21 is a perspective view showing an embodiment in which a cutting arm is a rectangular steel bar;
22 is a cross-sectional view showing an injection sharing area of an injection material for each discharge hole;
23 is a view showing a construction method of a pile equipped with an enlarged tip reinforcement according to the present invention.
24 shows an embodiment of a press-fit pile.
25 is a view showing an embodiment of a cast-in-place pile.
26 shows an embodiment of a PHC pile.
27 is a view showing an enlarged tip reinforcement part formed by penetrating a cutting box downward;
28 is a view showing an enlarged tip reinforcement part formed by upwardly rotating a cutting arm.
29 is a view showing an enlarged tip reinforcement part formed by penetrating a cutting arm downward and then rotating upward;
30 is a view showing an embodiment in which the injection material receiving portion is coupled to the outside of the rotational penetration rod.
31 is a view showing an embodiment in which a separate injection material accommodating unit is provided in the ground workshop.
32 is a view showing an embodiment in which an injection material is supplied by natural flow.

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

Figure 1 is a perspective view showing a rotary penetration rod equipped with a cutting arm, Figure 2 is a side view showing an embodiment provided with a penetration member. And Figure 3 is a perspective view showing an embodiment provided with a screw, Figure 4 is a cross-sectional view showing a cross section of Figure 3. In addition, FIG. 5 is a view showing an enlarged tip reinforcement part formed by a cutting arm, FIG. 6 is a view showing a state in which a pile is installed on the enlarged tip reinforcement part, and FIG. 7 shows an embodiment in which two screws are continuously provided. It is a perspective view of the city.

As shown in Figures 1 to 5, etc., the cutting arm for forming the expanded tip reinforcement portion of the pile of the present invention is formed in the support ground 12 in the ground to support the lower portion of the pile 2 (3). ), which is provided so as to protrude outward from the lower part of the rotational penetration rod 4 that is rotationally penetrated into the ground 1 in order to construct, the cutting arm 5 is provided with at least two or more, and the pile 2 The radius of rotation is larger than that of the front end, and an injection material supply path 51 is provided in the longitudinal direction on the inside or outside, and at one side is a discharge unit for injecting the injection material into the crushed ground in communication with the injection material supply path 51 (52) is characterized in that it is formed.

In the present invention, a cutting arm 5 equipped with a discharge part 52 is rotated and penetrated into the support ground 12 of the ground, cutting and pulverizing the ground, and mixing the injection material to form a pile on the upper part of the expanded tip reinforcement part 3. (2) A pile equipped with a cutting arm and an expanded end reinforcement part for forming an expanded end reinforcement part of a pile, which can obtain a greater bearing capacity than existing piles without penetrating the pile (2) to the supporting ground, which is a rock layer, by seating the end. It is to provide a construction method of.

The cutting arm 5 is provided at the bottom of the rotational penetration rod 4 that is rotated into the ground 1, and is protruded from the outside of the rotational penetration rod 4 in a horizontal direction and expanded into the support ground 12. It is for forming the front end reinforcement part (3).

The cutting arm 5 may be directly attached to the lower outer side of the rotary penetration rod 4 .

Alternatively, as shown in FIG. 2, a penetration member 40 having a reduced diameter is provided at the bottom of the rotary penetration rod 4, and a cutting arm 5 is coupled to the side of the penetration member 40. may be When using the penetration member 40, it is easy to maintain penetration and verticality of the rotary penetration rod 4.

The rotary penetration rod 4 is preferably penetrated to the top of the supporting ground 12 at the bottom by penetrating the upper soft ground, but in some cases it may penetrate to the soil layer.

The supporting ground 12 is mainly a solid soil layer or higher ground with an N value in the range of 15/30 to 50/30.

The rotary penetration rod 4 can be retrieved after forming the enlarged tip reinforcement part 3 in the ground by the cutting arm 5.

At least two or more of the cutting arms 5 protrude from the side of the rotary penetration rod 4 . Accordingly, when the rotational penetration of the rotational penetration rod 4, a plurality of cutting arms 5 rotates simultaneously to cut and crush the surrounding ground 1.

The cutting arm 5 has a length corresponding to the outer diameter of the expanded end reinforcement part 3 to be finally formed so that the diameter of the expanded end reinforcement part 3 is formed larger than the diameter of the tip of the pile 2 to be installed later. The radius of rotation can be formed larger than the tip of the pile (2).

The tip of the pile (2) is a part constituting the tip support area of the pile (2), and the PHC pile or the cast-in-place pile means the same tip as the pile diameter, and the helical pile is the lowest helix (21) that bears the vertical bearing capacity means

A discharge portion 52 through which injection material is discharged is formed on one side of the cutting arm 5 .

After cutting and pulverizing the surrounding ground by the cutting arm 5, the expanded tip reinforcement part 3 may be formed by injecting the injection material into the pulverized ground through the discharge part 52.

Specifically, when the expanded tip reinforcement part 3 is formed in the support ground 12 such as a hard soil layer or a weathered rock layer, the cutting arm 5 is rotated to a certain depth while cutting the support ground 12. Thereafter, the rotary penetration rod 4 is repeatedly rotated in forward and reverse directions to crush the cut ground. In addition, an injection material is injected into the fine voids of the pulverized raw ground to form an expanded tip reinforcement part 3 having a stronger pile bearing capacity than that of the original ground.

To this end, the rotational penetration rod 4 has a hollow cylindrical shape, and an injection material supply path 51 communicating with the inside of the rotational penetration rod 4 is provided inside or outside the cutting arm 5 ( 5) is formed long in the longitudinal direction, and a discharge part 52 communicating with the injection material supply path 51 is formed on one side of the cutting arm 5.

A grinding tip 53 may protrude from an upper or lower surface of the cutting arm 5 .

When the grinding tip 53 protrudes from the upper surface of the cutting arm 5, the cut ground on the top of the cutting arm 5 can be homogeneously pulverized by the grinding tip 53.

When the grinding tip 53 protrudes from the lower surface of the cutting arm 5, the grinding tip 53 forms a plurality of grooves in the ground to serve as a pilot cutting tip to facilitate cutting by the cutting arm 5. can do.

In order to maintain a constant penetration force and penetration speed during rotation of the rotation penetration rod 4, one screw 41 (FIG. 3) or two (FIG. 7) or more is continuously installed on the outside of the rotation penetration rod 4. can be attached.

After forming the enlarged tip reinforcement portion 3, the rotary penetration rod 4 is recovered, and the pile 2 is constructed so that the tip portion is mounted on the upper surface of the enlarged tip reinforcement portion 3 (FIG. 6).

According to the present invention, since the expanded tip reinforcement part 3 formed in the original ground serves as an expanded foundation for the individual piles 2, piles constructed by drilling into the rock mass even if the pile does not penetrate into the weathered rock or a press-fitting ready-made pile driven into the rock mass Alternatively, it can exert a greater allowable vertical bearing capacity than a helical pile.

In addition, after forming the expanded end reinforcement part 3 in the ground, constructing a rotary penetration type pile such as a helical pile and placing it on the upper part of the expanded end reinforcement part 3, only one helix 21 with a large diameter is allowed enough. Vertical support can be secured. Accordingly, the pile penetration resistance can be greatly reduced, and the cost can be reduced by reducing the cost of attaching the support steel plate.

In addition, since the pile construction depth is not deep, the casing can be directly seated on the expanded end reinforcement part (3), so pile construction is possible while groundwater inflow is prevented, and the slime on the bottom of the drilling hole can be completely removed, so that Like piles, drilled piles constructed after drilling holes can also secure the same bearing capacity as piles constructed in rock base.

Moreover, it is economical because it is used as the main material by cutting and crushing the supporting ground 12 to form the expanded tip reinforcement part 3 in the ground, and the site is clean because it is constructed by the non-casting rotary penetration method, and noise and vibration are almost generated. There is no concern about complaints.

Furthermore, since the discharge part 52 formed on the cutting arm 5 injects the injection material in an amount corresponding to the shared volume of the original ground to be strengthened, there is no fear of pulsation injection, and thus a reliable expanded tip reinforcement part 3 can be formed. have.

As shown in FIG. 1 , the discharge part 52 may include at least three or more discharge holes 52a formed at one side of the cutting arm 5 to be spaced apart from each other in the longitudinal direction.

The discharge part 52 may be formed of discharge holes 52a communicating from the injection material supply path 51 inside the cutting arm 5 to the outside of the cutting arm 5 . A plurality of the discharge holes 52a are formed on one side of the cutting arm 5 to be spaced apart from each other in the longitudinal direction.

It is preferable that three or more discharge holes 52a are provided so that the injection material is evenly injected throughout the cut and pulverized support ground 12 .

8 is a perspective view showing the disposition of the discharge part formed on the cutting arm.

As shown in FIG. 8 , the discharge part 52 of the cutting arm 5 may be formed on the rear side of the cutting arm 5 in the direction of rotation.

When the rotational penetration rod 4 rotates, the back side of the rotational direction of the cutting arm 5, that is, the rear side of the side receiving the cutting pressure, receives no pressure other than water pressure, and a space is instantaneously generated according to the rotation of the cutting arm 5. do.

Therefore, if the discharge part 52 is provided on the back side of the surface receiving the cutting pressure, it is easy to discharge the injection material. is evenly injected into the ground that has been cut and pulverized. Accordingly, the quality of the enlarged tip reinforcement part 3 can be ensured uniformly over a certain level.

9 is a perspective view showing an embodiment provided with a cutaway type discharge unit.

As shown in FIG. 9 , the discharge part 52 may be formed long in the longitudinal direction of the cutting arm 5 by cutting one side of the cutting arm 5 .

The discharge part 52 cuts one side of the cutting arm 5, in particular, the injection material supply path 51 outward so that the injection material is continuously and evenly injected into the cut and pulverized support ground 12, so that the cutting arm 5 ) can be formed continuously in the longitudinal direction of

As a result, it is possible to continuously inject the injection material evenly without any voids throughout the support ground 12 that is cut and pulverized according to the rotation of the cutting arm 5 .

10 to 12 are cross-sectional views illustrating a cutting arm equipped with a foreign matter inflow prevention unit in a discharge unit.

As shown in FIGS. 10 to 12 , a foreign material inflow prevention unit 6 may be provided in the discharge unit 52 of the cutting arm 5 .

When the rotary penetration rod 4 is rotated or when the surrounding ground is cut and pulverized by the cutting arm 5, the surrounding soil, groundwater or pulverized ground is passed through the discharge part 52 to the cutting arm 5 When introduced into the inside, the discharge part 52 is blocked, making it difficult to inject the injection material.

Therefore, a foreign matter inflow prevention unit 6 may be provided to prevent foreign matter from flowing in through the discharge unit 52 .

The foreign matter inflow prevention unit 6 may be configured to remain closed by external pressure to prevent inflow of foreign matter, and then be opened by the discharge pressure of the injection material or removed from the discharge unit 52 .

As shown in FIG. 10, the foreign matter inflow prevention part 6 may be formed in a shape in which a center protrudes outward. The foreign matter inflow prevention part 6 maintains a closed state due to the arch effect when external pressure is applied (Fig. 10 (a)), and the central part can be opened when the discharge pressure of the injection material is applied from the inside (Fig. 10 (b)).

As shown in FIG. 11, the foreign matter inflow prevention unit 6 may be configured to cover the entire surface of the discharge hole 52a in a state in which one end is fixed to one side of the front surface of the discharge hole 52a (( a)). When the discharge pressure of the injection material is applied from the inside of the foreign substance inflow prevention part 6, the discharge hole 52a may be opened while the other end rotates outward (FIG. 11(b)).

As shown in FIG. 12 , the foreign matter inflow prevention unit 6 may be configured in a tapered stopper shape to close the discharge hole 52a. The foreign matter inflow prevention part 6 does not fall into the cutting arm 5 by external pressure (FIG. 12(a)), and can fall out due to the fluid pressure of the injection material (FIG. 12(b)). ).

Due to the foreign material inflow prevention unit 6 provided in the discharge unit 52, a high-quality enlarged tip reinforcement unit 3 can be formed at the bottom of the rotary penetration rod 4 regardless of changes in groundwater or various stratum conditions.

Although not shown in the drawing, the foreign matter inflow prevention unit 6 may be formed in the form of a protective cap with a hole and welded to the outside of the discharge unit 52 .

When the injection material supply path 51 of the cutting arm 5 is previously filled with injection material, it is possible to prevent foreign matter from being introduced into the discharge unit 42 by the injection material pressure without a separate foreign matter inflow prevention device.

The foreign substance inflow prevention unit 6 may close the discharge unit 52 until the injection material is injected, and may open the discharge unit 52 when the injection material is injected.

When the groundwater level exists around the enlarged tip reinforcement part 3, it is preferable to completely close the discharge part 52 until injection of the injection material.

Accordingly, the foreign matter inflow prevention unit 6 may be configured to selectively close or open the discharge unit 52 .

That is, the foreign matter inflow prevention unit 6 temporarily closes the discharge part 52 when the rotary penetration rod 4 enters the rotation, and opens the discharge part 52 only when the injection material is injected to allow the injection material to be discharged. can

When the injection material is injected later after cutting and pulverizing the surrounding ground with the cutting arm 5, the foreign matter inflow prevention unit 6 can close the discharge unit 52 even during cutting and pulverization of the ground.

When the cutting and grinding of the ground and the injection of the injection material are performed at the same time, the discharge unit 52 may be opened even during the cutting and grinding.

13 is a view showing the state of the foreign matter inflow prevention unit when the discharge unit is closed, and FIG. 14 is a view showing the state of the foreign material inflow prevention unit when the discharge unit is open.

As shown in FIGS. 13 and 14, the foreign matter inflow prevention part 6 is formed in the form of a pipe that can slide inside the injection material supply path 51 and has an injection hole at a position corresponding to the discharge part 52. (61) is formed, and before injection of the injection material, the injection hole 61 is positioned offset from the discharge portion 52 so that the discharge portion 52 is closed. By matching, the discharge part 52 can be opened.

The foreign matter inflow prevention part 6 may be formed in an empty pipe shape and provided inside the injection material supply passage 51 so that the foreign matter inflow prevention part 6 can selectively close and open the discharge part 52. have.

An injection hole 61 is formed in the foreign matter inflow prevention part 6 at a position corresponding to the discharge part 52 .

13(a) and (b) respectively show a front cross-sectional view and a plan view when the discharge part 52 is closed, and FIG. 14(a) and (b) show a front cross-sectional view when the discharge part 52 is open, respectively. Show a plan view.

As shown in FIG. 13, when the position of the foreign matter inflow prevention part 6 is adjusted so that the injection hole 61 and the discharge part 52 are not aligned, the entire discharge part 52 becomes a pipe-shaped foreign matter inflow prevention part 6 can be closed by

As shown in FIG. 14, when the position of the foreign matter inflow prevention part 6 is adjusted so that the injection hole 61 and the discharge part 52 coincide, the discharge part 52 is opened and the injection hole 61 and the discharge part The injection material may be injected to the outside through (52).

15 and 16 are cross-sectional views showing the working relationship of the foreign matter inflow prevention unit by the pressing wedge.

In order to slide the foreign matter inflow prevention part 6 outward, the inner end of the foreign matter inflow prevention part 6 is positioned at the inner center of the rotary penetration rod 4, and the upper surface of the inner end is inclined. Can be formed.

The foreign matter inflow prevention part 6 provided inside the left and right cutting arms 5 may be configured such that the inner ends come into contact with each other (FIG. 15).

After rotating the rotary penetration rod 4 to reach the support base 12, when the tapered pressing wedge 7 of the upper and lower end surfaces is lowered from the inside of the rotary penetration rod 4, the pressing wedge 7 By pressing the upper surface of the inclined inner end of the foreign matter inflow prevention part 6 on both sides, the foreign matter inflow prevention part 6 slides outward (FIG. 16). Accordingly, the discharge hole 52a may be opened when the position of the injection hole 61 coincides with the position of the discharge hole 52a.

The pressure wedge 7 may be provided at the lower part of the injection gun 9 provided to communicate with the injection material accommodating portion 8 in which the injection material is accommodated.

The injection gun 9 supplies the injection material to the injection material supply path 51 of the cutting arm 5 .

Therefore, when the injection gun 9 is lowered, the pressing wedge 7 presses the upper surfaces of the inner ends of the foreign matter inflow prevention parts 6 on both sides to slide them outward, and is injected between the spaced foreign matter inflow prevention parts 6 on both sides The gun 9 is inserted to supply the injection material to the injection material supply path 51 of the cutting arms 5 on both sides.

17 and 18 are cross-sectional perspective views illustrating an operational relationship by rotation of a foreign matter inflow prevention unit when the incision type discharge unit is provided.

As shown in FIGS. 17 and 18, the discharge part 52 is formed long in the longitudinal direction of the cutting arm 5 by cutting one side of the cutting arm 5, and the injection hole 61 is filled with foreign substances. One side of the inflow prevention part 6 is cut and formed long in the longitudinal direction of the foreign matter inflow prevention part 6, and the foreign matter inflow prevention part 6 is provided to be rotatably movable inside the injection material supply passage 51. By rotating the foreign matter inflow prevention unit 6, the positions of the injection hole 61 and the discharge unit 52 can be matched.

Since the incised discharge part 52 is continuously formed along the longitudinal direction of the cutting arm 5, the pipe-type foreign matter inflow prevention part 6 slides in the longitudinal direction to selectively close or open the discharge part 52. Can not.

Therefore, one side of the foreign matter inflow prevention part 6 is cut so that the injection hole 61 of the foreign matter inflow prevention part 6 is formed the same as the discharge part 52 to have a C-shaped cross section, and the foreign matter inflow prevention part The discharge portion 52 can be closed by rotating the (6) to shift the vertical positions of the injection hole 61 and the discharge portion 52 from each other (FIG. 17).

When the discharge part 52 is opened, the foreign matter inflow prevention part 6 is reversely rotated to match the vertical positions of the injection hole 61 and the discharge part 52 (FIG. 18).

The foreign matter inflow prevention part 6 may be configured such that the inner end of the foreign matter inflow prevention part 6 is axially rotated by extending an inner end to the inside of the rotary penetration rod 4 and pressurized by a pressing wedge 7 or the like.

19 is a perspective view showing an embodiment in which a cutting arm is a steel bar, FIG. 20 is a cross-sectional view showing a cross section of FIG. 19, and FIG. 21 is a perspective view showing an embodiment in which a cutting arm is a rectangular steel bar.

As shown in FIGS. 19 to 21 , the cutting arm 5 may be composed of a steel pipe or steel bar having a plurality of grinding tips 53 externally.

As shown in FIG. 4 and the like, the cutting arm 5 may be a steel pipe.

If the cutting arm 5 is made of a steel pipe, since the injection material supply path 51 is formed directly inside the cutting arm 5, it is easy to form the injection material supply path 51 and the discharge part 52.

When the cutting arm 5 is coupled to the side of the penetration member 40 under the rotary penetration rod 4, the penetration member 40 may also be formed as a steel pipe.

19 to 21, the cutting arm 5 may be composed of a steel rod.

When the cutting arm 5 is made of a steel rod, it can be made of a smaller diameter than the cutting arm 5 which is a steel pipe, so that the cutting arm 5 can be easily inserted into the rotation.

When the cutting arm 5 is a steel bar, the injection material supply path 51 may be provided outside the cutting arm 5 .

The cutting arm 5 may also use a prismatic steel bar (FIG. 21).

As shown in FIG. 21, the cutting arms 5 provided on both left and right sides are integrally connected, but the connecting portion 50 is integrally protruded and formed at the upper center of the cutting arm 5 to rotate the connecting portion 50. It can be fixedly coupled to the lower end of the penetration rod (4).

21, the injection material supply path 51 is formed in the form of a groove on the side of the cutting arm 5, and can be closed by a cover (not shown) formed with a discharge part.

As shown in FIG. 21 , the cutting arm 5 may be formed as a tapered end face having a thinner thickness toward the outer side.

The outer portion of the rotation radius of the cutting arm 5 has a longer arm length from the rotation center than the inner portion, giving a burden to the rotation penetration equipment for rotating the rotation penetration rod 4.

Therefore, by forming the inner side of the turning radius of the cutting arm 5 thicker and the outer side thin, it is possible to reduce the amount of steel required when manufacturing the cutting arm 5 and facilitate rotational penetration of the cutting arm 5 . In addition, it is possible to widen the construction range by reducing the possibility of getting caught in large gravel during the rotational penetration of the cutting arm (5).

22 is a cross-sectional view showing the injection sharing area of the injection material for each discharge hole.

As shown in FIGS. 7, 9, and 22, the discharge area of the discharge portion 52 may increase toward the outside of the cutting arm 5.

The expanded tip reinforcement part 3 is provided at the bottom of the pile 2 and serves as an independent foundation for transmitting the vertical load of the pile 2 to the ground 1. At this time, in order to distribute the stress due to the vertical load and smoothly transfer it to the ground 1, the entire reinforced base of the expanded tip reinforcement part 3 must have uniform strength.

However, the cutting arm 5 injects the injection material through the discharge unit 52 while rotating, and the rotational locus of the cutting arm 5 increases as the rotation radius increases. Therefore, as the distance from the center of rotation of the cutting arm 5 increases, the trajectory of the circle where the injection material discharge point moves increases. Accordingly, when the same amount of injection material is discharged from each discharge point of the discharge unit 52, the same amount of injection material must be injected into a wider area, so that the amount of injection material injected per unit area decreases as the discharge point becomes farther away.

Accordingly, the injection material discharge area may be increased toward the outside of the cutting arm 5 so that the same amount of injection material is injected at any part of the entire cylindrical ground to be cut and pulverized to form the enlarged tip reinforcement part 3.

The discharge area may be configured so that the amount of injection material injected from the discharge unit 52 is gradually increased in proportion to the radius of rotation of the injection material discharge position.

To this end, when the discharge part 52 is cut in the injection material supply path 51, the cut upper and lower widths may be increased toward the outside (FIG. 9). When the discharge portion 52 is formed of a plurality of discharge holes 52a, the diameter of the discharge holes 52a may gradually increase toward the outside (FIGS. 7 and 22).

23 is a view showing a method of constructing a pile equipped with an enlarged tip reinforcement according to the present invention. And FIG. 24 is a view showing an embodiment of a press-fit pile, FIG. 25 is a view showing an embodiment of a cast-in-place pile, and FIG. 26 is a view showing an embodiment of a PHC pile.

The method of constructing a pile having an enlarged tip reinforcement part of the present invention relates to a method of constructing a pile seated on an upper portion of an enlarged tip reinforcement part formed using the cutting arm of the present invention described above with reference to FIGS. 1 to 22.

In the present invention, first, (a) the rotational penetration rod 4 is rotated to penetrate the rotational penetration rod 4 so that the cutting arm 5 under the rotational penetration rod 4 reaches the top of the support base 12 (Fig. 23 (a)).

That is, the rotary penetration rod 4, in which the cutting arm 5 protrudes outward from the bottom, is rotated into the ground 1 to reach the top of the support ground 12.

Next, (b) the rotational penetration rod 4 is rotated to cut and crush the supporting ground 12 with the cutting arm 5 to a diameter larger than the tip of the pile 2, while the discharge portion 52 ), the injection material is injected into the cutting and pulverized support ground 12 and mixed to form the expanded tip reinforcement part 3 of a cylindrical shape (FIG. 23 (b)).

In the step (b), the rotary penetration rod 4 is rotated and the cutting arm 5 cuts and crushes the lower support base 12. Here, the lower ground to be cut and pulverized is the supporting ground, which is a hard soil layer or a bedrock layer of weathered rock or higher.

Since the cutting arm 5 has a radius of rotation longer than the outer diameter of the front end of the pile 2, the cutting and crushing support ground 12 is formed in a cylindrical shape with a larger diameter than the outer diameter of the front end of the pile 2.

The cutting and pulverized ground is mixed with the injection material injected through the discharge part 52 of the cutting arm 5 to form the expanded tip reinforcement part 3 in the shape of a column.

The injection material may be injected by reciprocating up and down while repeatedly rotating the rotary penetration rod 4 in the forward and reverse directions after completing the cutting and crushing of the ground with the cutting arm 5. Alternatively, while cutting and pulverizing the ground, the injection material may be injected into the cut and pulverized ground at the same time. In this case, the construction period can be shortened and construction is convenient.

The support base 12 may be cut and pulverized to a diameter three or more times the vertical projected area of the front end of the pile 2.

As shown in FIG. 23 and the like, the enlarged front end reinforcement part 3 may be formed to protrude upward from the support base 12.

Thereafter, (c) the rotary penetration rod 4 equipped with the cutting arm 5 is recovered to the ground (Fig. 23(c)).

After forming the enlarged tip reinforcement part 3, the rotary penetration rod 4 is recovered to the ground. The recovery of the rotary penetration rod 4 is performed before hardening of the enlarged tip reinforcement part 3.

After recovering the rotary penetration rod 4 and the cutting arm 5, the operation of forming the enlarged tip reinforcement part 3 may be repeated by moving the equipment to another ball.

Finally (d) the pile (2) is constructed so that the tip of the pile (2) is mounted on the upper surface of the expanded tip reinforcement part (3) (Fig. 23 (d)).

That is, by constructing the pile (2) at the position of the expanded tip reinforcement part (3) formed in the ground, the tip of the pile (2) is seated on the upper part of the expanded tip reinforcement part (3).

If the pile 2 is a helical pile, it can be installed directly without additional drilling or casing work (FIG. 23).

When the pile 2 is a ready-made pile such as a ductile pile, the pile 2 can be installed by press-in or rotational penetration (FIG. 24).

In this case, the pile (2) having a diameter of 1.0 to 1.6 times the diameter of the rotary penetration rod (4) can be inserted at the top of the enlarged tip reinforcement part (3) by means of press-in, vibration press-in or rotation press-in.

In the cohesive ground, since the recovery hole 11' formed by the rotary penetration rod 4 is maintained the same as the diameter of the rotation penetration rod 4 for a certain period of time, the pile 2 using the recovery hole 11' can be installed in the exact location.

In order to facilitate press-in of the pile 2, a guide member (not shown) having a diameter 0.7 to 1.0 times the diameter of the recovery hole 11' may be provided at the tip of the pile 2.

As shown in FIG. 25, when the pile 2 is a cast-in-place pile, after forming the expanded tip reinforcement part 3, ground drilling and casing work are required. At this time, since the drilling depth for the construction of the pile 2 is not deep due to the formation of the expanded tip reinforcement portion 3, the casing 10 is constructed to the upper end of the expanded tip reinforcement portion 3, and the drilling hole 11 with high pressure air ) can completely remove slime from the floor.

After drilling the ground and inserting the casing 10, the reinforcing bar network 22 is inserted (Fig. 25 (a)), and the concrete 23 is cast on-site to complete the pile construction (Fig. 25 (b)).

As shown in FIG. 26, when the pile 2 is a PHC pile or a steel pipe pile, the ground is drilled, then the casing 10 is installed, and the PHC pile is inserted into the casing 10. Thereafter, grouting (G) is performed between the PHC pile and the casing 10.

In order to construct the pile 2 in an accurate position, immediately after recovering the rotary penetration rod 4, a guide rod (not shown) is inserted into the recovery hole 11', and the guide rod is inserted into the pile 2. The pile 2 can be constructed while guiding the pile 2 with a rod.

In order to confirm that the pile 2 is properly seated in the expanded tip reinforcement part 3 in the ground, the amount of settlement can be checked by rotating the pile 2 on the ground at the time of hardening of the injection material or by hitting it.

In particular, if it is confirmed that downward penetration hardly occurs by rotary press-fitting at a predetermined torque, it is simple and there is little noise vibration.

The cutting arm 5 is provided with a foreign matter inflow prevention part 6 that selectively closes or opens the discharge part 52, and in the step (a), the foreign matter inflow prevention part 6 prevents the discharge part ( 52) is closed, after the cutting arm 5 provided on the rotary penetration rod 4 reaches the top of the supporting ground 12, in the step (b), by the foreign matter inflow prevention unit 6 In a state in which the discharge portion 52 is open, the injection material may be injected through the discharge portion 52 while cutting and pulverizing the supporting ground 12 (FIGS. 10 to 12).

The foreign matter inflow prevention part 6 prevents foreign matter from entering into the injection material supply path 51 through the discharge part 52 of the cutting arm 5 .

The foreign substance inflow prevention unit 6 may be configured to close the discharge unit 52 until the injection material is injected, and to open the discharge unit 52 when the injection material is injected.

In the step (b), if the foreign matter inflow prevention part 6 is of a stopper type, the foreign matter inflow prevention part 6 may be removed from the discharge part 52 and opened by the injection pressure of the injection material (Fig. 12(b)). ).

When the foreign matter inflow prevention part 6 is a pipe type provided inside the cutting arm 5, the foreign matter inflow prevention part 6 is moved by the pressure of the pressing wedge 7 and the foreign matter inflow prevention part 6 is injected. The discharge portion 52 may be opened by matching the ball 61 with the discharge portion 52 (FIG. 14).

27 is a view showing an enlarged tip reinforcement part formed by penetrating a cutting box downward, FIG. 28 is a view showing an enlarged tip reinforcement part formed by upwardly rotating a cutting arm, and FIG. 29 is a view showing an upward penetration after penetrating a cutting arm downward. It is a view showing the enlarged tip reinforcement part formed by rotation.

As shown in FIGS. 27 to 29, in the step (b), the enlarged tip reinforcement part 3 injects the injection material while penetrating the cutting arm 5 downwardly, or penetrating the cutting arm 5 downwardly. Secondary formation may be performed by injecting the injection material while rotating upward or by injecting the injection material while rotating the cutting arm 5 downward to inject the injection material while rotating upward after the primary formation.

The enlarged tip reinforcement part 3 may be formed by injecting an injection material while rotating and penetrating the cutting arm 5 downward (FIG. 27).

When the enlarged front end reinforcement part 3 protrudes upward from the support base 12 (Fig. 27(b)), in the step (a), the cutting arm 5 moves upward from the support base 12. It reaches a position spaced apart from a certain height (Fig. 27 (a)).

The enlarged tip reinforcement part 3 may be formed by penetrating the cutting arm 5 downward and then injecting an injection material while rotating upward (FIG. 28).

In this case, in step (a), after rotating the cutting arm 5 to reach the bottom of the enlarged tip reinforcement part 3 to be installed (Fig. 28(a)), the rotary penetration rod 4 is rotated and raised. to inject the injection material while cutting and pulverizing the ground 1 by the cutting arm 5 (Fig. 28 (b)).

The enlarged tip reinforcement part 3 is formed primarily by cutting and crushing the ground while lowering the cutting arm 5 and injecting an injection material (FIG. 29 (a) and (b)), While raising again, it is possible to form a secondary upward supplement through cutting and crushing of the ground and injection of the injection material (Fig. 29 (c)).

If there is no screw 41 in the rotational penetration rod 4, the rotational penetration rod 4 is pressed down with the rotational insertion equipment on the ground, and the entire process of lifting and recovering upwards on the ground is performed only in one direction of forward rotation. can do. Therefore, it is possible to naturally prevent foreign substances from flowing into the discharge unit 52 during the entire process.

When the screw 41 is provided on the rotational penetration rod 4, it is possible to naturally obtain downward or upward thrust according to the direction of rotation. On the other hand, since the direction of rotation is changed during construction, the foreign matter inflow prevention unit 6 is essential.

In the step (d), the position of the expanded tip reinforcement part (3) in the ground is identified using a 3D survey system, and then the position of the tip end of the pile (2) is monitored in real time and the position of the expanded end reinforcement part (3) is determined. The pile (2) can be installed so that the tip of (2) is mounted.

When it is difficult to maintain the shape of the recovery hole 11 'when recovering the rotary intrusion rod 4, such as in a sandy soil layer, the position of the enlarged tip reinforcement portion 3 is grasped using a 3-dimensional survey system, and the enlarged tip reinforcement portion ( The pile 2 can be constructed at the center position of 3).

Specifically, the work is temporarily suspended at the time when the formation of the expanded tip reinforcement part (3) is completed in the ground, and the current position of the rotation penetration rod (4) and the length and tilt angle of the rotation penetration rod (4) are substituted to obtain 3 The position of the enlarged tip reinforcement part 3 can be specified by a method such as surveying.

Thereafter, while monitoring the position of the pile 2 in real time, the pile 2 is constructed so that the center of the lower end of the pile 2 coincides with the center of the expanded tip reinforcement part 3.

Alternatively, right after the expansion end reinforcement part (3) is formed, a separate transmitter or receiver or other easily identifiable material is placed on the top of the expansion end reinforcement part (3), and then installed at the bottom of the drilling auger during the construction of the pile (2) The center position of the enlarged tip reinforcement part 3 can be confirmed by a transmitter or receiver or an underground camera.

30 is a view showing an embodiment in which the injection material receiving portion is coupled to the outside of the rotational penetration rod.

As shown in FIG. 30, the inside of the rotary penetration rod 4 is provided with an injection material transfer path 42 for transporting the injection material to the injection material supply path 51, so that the injection material is transported in the step (b). It may be supplied by the injection material receiving portion 8 coupled to the outside of the upper end of the rotary penetration rod 4 so as to be connected to the furnace 42.

In the step (b), before injection of the injection material, the injection material accommodating portion 8 is coupled to the outside of the rotary penetration rod 4 to rotate the injection material accommodating portion 8 together with the rotation penetration rod 4.

In this case, an injection material transfer path 42 for transferring the injection material to the injection material supply path 51 of the cutting arm 5 may be provided inside the rotary penetration rod 4 . And the upper end of the injection material conveying path 42 communicates with the outside from the upper part of the rotary penetration rod 4, and the injection material accommodating part 8 is connected to the upper end of the injection material conveying path 42 to inject material conveying path 42 ) can supply the injection material.

The injection material accommodating portion 8 may be configured separately into a main accommodating portion 81 and a hardener accommodating portion 82.

An injection material in which the main agent and the curing agent respectively supplied from the subject accommodating part 81 and the curing agent accommodating part 82 may be supplied through the injection material transfer path 42 .

The injection material may be injected by natural flow due to a height difference between the injection material accommodating part 8 and the discharge part 52 of the cutting arm 5. Alternatively, a separate pump (not shown) may be coupled to the injection material accommodating portion 8 to inject the injection material under pressure using the pump pressure.

31 is a view showing an embodiment in which a separate injection material accommodating unit is provided in the ground workshop.

As shown in FIG. 31, the inside of the rotary penetration rod 4 is provided with an injection material transport path 42 for transporting the injection material to the injection material supply path 51, and an injection material accommodating portion 8 is provided in the workshop on the ground. The injection material transfer path 42 and the injection material receiving part 8 are connected by a connection pipe 80, so that when the rotary inlet rod 4 rotates in the step (b), the connection pipe 80 The injection material may be injected while being wound around the upper outer circumferential surface of the rotary penetration rod (4).

The injection material may be supplied from the injection material receiving part 8 provided separately in the ground workshop.

In this case, an injection material transport path 42 is provided inside the rotary penetration rod 4, and the injection material transport path 42 and the injection material accommodating portion 8 can be connected by a connecting pipe 80.

Since the step (b) is performed while the rotational penetration rod 4 rotates, the connection pipe 80 is configured to be wound around the upper outer circumferential surface of the rotational penetration rod 4 when the rotational penetration rod 4 rotates .

A separate pump (not shown) is coupled to the injection material accommodating portion 8 to inject the injection material under pressure.

32 is a view showing an embodiment in which an injection material is supplied by natural flow.

As shown in FIG. 32, an injection material accommodating portion 8 is provided at a certain height from the cutting arm 5 inside the rotary penetration rod 4, and the injection material is accommodated inside the rotation penetration rod 4. An injection material transport path 42 connecting the unit 8 and the injection material supply path 51 is provided, and after the injection material is injected into the injection material accommodating part 8 in the step (b), the injection material transport path 42 Injection material can be supplied through.

The injection material can be injected while securing the minimum discharge pressure by potential energy at a certain height inside the rotary penetration rod 4 without applying a separate injection pressure.

To this end, an injection material accommodating portion 8 is provided at a position spaced apart from the cutting arm 5 upward at a predetermined height inside the rotary penetration rod 4, and the injection material accommodating portion 8 is provided at the lower portion of the injection material accommodating portion 8 ( An injection material transfer path 42 through which the injection material of 8) is discharged may be provided.

The lower end of the injection material conveyance path 42 is connected to the injection material supply path 51 to transfer the injection material discharged from the injection material accommodating portion 8 to the injection material supply path 51.

The injection material accommodating portion 8 may be formed with an open top so that the injection material can be supplied to the inside of the rotation penetration rod 4 immediately before injection of the injection material in the rotation penetration rod 4 .

Accordingly, in the step (b), the rotation of the rotary penetration rod 4 may be stopped and the injection material may be dropped toward the injection material receiving portion 8 through the upper part of the rotation penetration rod 4.

As shown in (a) of FIG. 32, the injection material accommodating portion 8 may be divided into a main accommodating portion 81 and a hardener accommodating portion 82 by installing a partition wall 83 in the center. In this case, the injection material in which the main material and the hardener supplied from the main material accommodating part 81 and the hardener accommodating part 82, respectively, may be supplied through the injection material transport path 42.

Alternatively, as shown in (b) of FIG. 32, an injection material in which a subject capable of delayed expansion reaction and a curing agent are mixed in advance is injected into the injection material receiving portion 8 inside the rotary penetration rod 4, and then the injection material transport path It can be supplied through (42).

1: ground 10: casing
11: drilling hole 11 ': recovery hole
12: support base 2: pile
21: helix 22: rebar net
23: concrete 3: expanded tip reinforcement
4: rotational penetration rod 40: penetration member
41: screw 42: injection material transport path
5: cutting arm 50: connection
51: injection material supply path 52: discharge unit
52a: discharge hole 53: grinding tip
6: foreign substance inflow prevention unit 61: injection hole
7: pressure wedge 8: injection material receiving part
80: connector 81: subject accommodation unit
82: curing agent receiving part 83: partition wall
9: injection gun G: grouting

Claims (17)

Protrudes outward from the lower part of the rotary penetration rod 4, which is formed in the support base 12 of the ground and is rotated into the ground 1 to construct the expanded tip reinforcement part 3 supporting the lower part of the pile 2 It relates to a cutting arm (5) for forming an enlarged tip reinforcement portion (3) of a pile (2) provided to be provided,
At least two or more cutting arms 5 are provided, the radius of rotation is larger than that of the front end of the pile 2, and an injection material supply path 51 is provided inside or outside in the longitudinal direction, and one side of the injection material is provided. A discharge part 52 for injecting the injection material into the ground that is communicated with the supply path 51 is formed, and the discharge part 52 of the cutting arm 5 has a discharge part 52 until the injection material is injected. A foreign material inflow prevention unit 6 is provided to close the and open the discharge unit 52 when the injection material is injected.
The foreign substance inflow prevention part 6 is formed in the form of a pipe that can slide inside the injection material supply path 51 and has an injection hole 61 formed at a position corresponding to the discharge part 52, so that the injection material is injected before injection. The ball 61 is positioned offset from the discharge part 52 so that the discharge part 52 is closed, and when the injection material is injected, the injection hole 61 coincides with the discharge part 52 and the discharge part 52 is opened Cutting arm for forming the expanded tip reinforcement of the pile, characterized in that.
delete delete delete delete delete In paragraph 1,
The discharge part 52 is formed long in the longitudinal direction of the cutting arm 5 by cutting one side of the cutting arm 5, and the injection hole 61 is formed by cutting one side of the foreign matter inflow prevention part 6 It is formed long in the longitudinal direction of the foreign matter inflow prevention part 6, and the foreign matter inflow prevention part 6 is provided to be rotatably movable inside the injection material supply passage 51 by rotating the foreign matter inflow prevention part 6 A cutting arm for forming an enlarged tip reinforcement part of a pile, characterized in that the position of the injection hole 61 and the discharge part 52 are matched.
In paragraph 1,
The cutting arm 5 is a cutting arm for forming an enlarged tip reinforcement portion of a pile, characterized in that the steel pipe or steel rod having a plurality of grinding tips 53 outside.
In paragraph 1,
The cutting arm 5 is a cutting arm for forming an enlarged tip reinforcement portion of a pile, characterized in that the thickness is formed thinner toward the outside.
In paragraph 1,
The cutting arm for forming the enlarged tip reinforcement portion of the pile, characterized in that the discharge portion 52 is formed so that the discharge area increases toward the outside of the cutting arm 5.
It is for constructing a pile to be seated on the upper part of the enlarged tip reinforcement formed by using the cutting arm according to claim 1,
(a) rotating the rotational penetration rod 4 to reach the cutting arm 5 under the rotational penetration rod 4 to the top of the support base 12;
(b) The rotary penetration rod 4 is rotated to cut and crush the supporting ground 12 with the cutting arm 5 to a diameter larger than the tip of the pile 2, while passing through the discharge part 52 Injecting and mixing an injection material into the cut and pulverized support ground 12 to form an enlarged tip reinforcement part 3 of a cylindrical shape;
(c) recovering the rotary penetration rod 4 equipped with the cutting arm 5 to the ground; and
(d) constructing a pile (2) so that the front end of the pile (2) is mounted on the upper surface of the expanded tip reinforcement part (3); Construction method of a pile equipped with an enlarged tip reinforcement, characterized in that consisting of.
In paragraph 11,
In the step (a), the cutting arm 5 provided on the rotary penetration rod 4 reaches the top of the supporting ground 12 in a state where the discharge part 52 is closed by the foreign matter inflow prevention part 6 After being
In the step (b), the injection material is injected through the discharge portion 52 while cutting and pulverizing the supporting ground 12 in a state in which the discharge portion 52 is opened by the foreign matter inflow prevention portion 6 A method of constructing a pile equipped with an enlarged tip reinforcement part.
In paragraph 11,
In the step (b), the enlarged tip reinforcement part 3 injects the injection material while penetrating the cutting arm 5 downwardly, or injects the injection material while rotating the cutting arm 5 downward and then upwardly rotating it. (5) A method of constructing a pile equipped with an enlarged tip reinforcement, characterized in that the injection material is injected while rotating downward and the injection material is first formed, and then the injection material is injected while rotating upward to form the secondary formation.
In paragraph 11,
In the step (d), the position of the expanded tip reinforcement part (3) in the ground is identified using a 3D survey system, and then the position of the tip end of the pile (2) is monitored in real time and the position of the expanded end reinforcement part (3) is determined. A construction method of a pile equipped with an enlarged tip reinforcement, characterized in that the pile (2) is installed so that the tip of (2) is mounted.
In paragraph 11,
An injection material transfer path 42 for transferring the injection material to the injection material supply path 51 is provided inside the rotary penetration rod 4,
In the step (b), the injection material is supplied by the injection material receiving portion 8 coupled to the outer upper end of the rotary penetration rod 4 so as to be connected to the injection material transfer path 42. construction method.
In paragraph 11,
An injection material transfer path 42 for transporting the injection material to the injection material supply path 51 is provided inside the rotary penetration rod 4, and an injection material accommodating portion 8 is provided in the ground workshop, and the injection material transfer path ( 42) and the injection material accommodating portion 8 are connected by a connecting pipe 80,
In the step (b), when the rotating penetration rod 4 rotates, the connection pipe 80 is wound around the upper outer circumferential surface of the rotating penetration rod 4 and the injection material is injected. Way.
In paragraph 11,
An injection material accommodating portion 8 is provided at a constant height from the cutting arm 5 inside the rotary penetration rod 4, and an injection material accommodating portion 8 and an injection material supply path are provided inside the rotation penetration rod 4. An injection material transfer path 42 connecting the 51 is provided,
In the step (b), the injection material is supplied to the injection material receiving portion 8 and then the injection material is supplied through the injection material transfer path 42.

Images