KR101040040B1 - Method for constructing pile using spray type excavating bit - Google Patents

Abstract

PURPOSE: A pile construction method using an injection type excavation bit is provided to install a pile by excavating through the inside of a pile and to perform installation work by connecting different kinds of piles using a non-welding method. CONSTITUTION: A pile construction method using an injection type excavation bit comprises the steps of: inputting a pile installation device to a construction site; carrying in many piles using the pile installation device; mounting an injection type excavation bit, a lower excavation rod and a lower pile to the pile installation device; excavating by rotating the injection type excavation bit forward, and press-fitting the lower pile; separating a lower auger from the lower pile, and separating an upper auger from the lower excavation rod; connecting a middle excavation rod to the top of the lower excavation rod; excavating by rotating the injection type excavation bit forward, and press-fitting a middle pile; separating a lower auger from the middle pile, and separating an upper auger from the middle excavation rod; connecting the upper excavation rod to the middle excavation rod; connecting an upper pile to the middle pile by a connection plate; excavating by rotating the injection type excavation bit forward, and press-fitting the upper pile; grouting the bottom of an excavation hole by injecting cement milk through an injection nozzle using the injection type excavation bit; contracting the injection type excavation bit by backward rotation, and then drawing out and dismantling the injection type excavation bit and the excavation rod; and hitting the upper pile.

Description

Method for constructing pile using spray type excavating bit}

The present invention relates to a pile construction technology, and more particularly, pile pile by excavating through the inside of the pile and piles using a spray type drilling bit that can be constructed by connecting different piles to each other in a non-welding manner. It is about a construction method.

In general, in order to construct a building on a soft ground, it is first necessary to construct a soft ground by constructing a reinforcement such as a cylindrical or rectangular pile having a high strength that can securely support the pillar of the building or a water barrier to block water. Reinforce.

In particular, the construction method using piles is a method to transfer the load of the structure constructed on the ground to the ground.In order to improve the workability and secure structural rigidity efficiently by injecting piles firmly into a solid support layer of the ground, Construct using steel pile, concrete pile, composite pile, etc.

The method of constructing such piles is a type method of forcing the piles to the final support layer of the ground using driving, and drilling equipment is formed by drilling the ground first with excavation equipment such as Earth-Auger. There is a preboring method in which a pile is inserted into an excavation hole and then grouted around the pile to secure a predetermined support force.

The pile construction by the type construction method has advantages such as fast air, low construction cost, and large friction force of the pile main surface after construction. However, the pile method by the type construction method may cause damage to the pile because a large drag force is required when there is a hard layer in the middle of the ground during the driving operation before the tip of the pile reaches the final support layer of the ground. As a result, it is difficult to penetrate the target final support layer. That is, the pile by the conventional type method is bound to limit the maximum support capacity. Also, in order to perfectly support the design load of the upper structure without a hitch, a large number of piles are required more than necessary, so it is inevitable to increase the material cost and construction cost of the pile, and the air also becomes long, which contributes to the increase of the overall construction cost.

The construction of the pile by the pre-boring method is an effective method when there is a high possibility that a hard layer exists on the ground, or when driving is difficult due to pollution such as noise and vibration, or when tip support is important. In the case of pile construction by the pre-boring method, the pile is excavated from the beginning to the end over the entire depth where the pile is installed, and not only is there a large amount of excavation, but also the pile is inserted after the unconditional drilling. Considering this, the waste of construction cost is a very big problem. When drilling, there is a high possibility that the collapse of the wall due to groundwater, etc. in the surface area is required to take additional measures, such as to install a casing to prevent the collapse of the wall, and the excavation work takes a lot of time, the air is long.

In addition, pile construction by the type and pre-boring methods requires a joint construction during pile penetration work when the target support layer is deeper than the pile pile. However, the welding method requires a lot of time and difficulty in welding. Require.

In addition, such a pile is constructed using a pile construction device for excavating the ground, and at this time, the pile is constructed after excavating the ground through the excavation bit mounted on the excavating rod. However, such a conventional drilling bit is excavated by the same diameter in both the front end and the rear end is also a constant diameter of the pile is constructed. Accordingly, there is a problem in that the bearing capacity of the tip of the pile is not good and the reinforcement of the soft ground cannot be effectively performed.

Accordingly, an object of the present invention is to provide a pile construction method using the injection-type excavation bit can be dug through the inside of the pile to construct the pile.

Another object of the present invention is to provide a pile construction method using a jetting drilling bit that can be connected to each other in a complex combination of different kinds of files in a non-welding manner.

Still another object of the present invention is to provide a pile construction method using an injection-type drilling bit which can excavate a drilling hole when the excavation bit is drilled to be larger than the outer diameter of the drilling bit.

In order to achieve the above object, the present invention is a pile construction method using the injection-type drilling bit, the pile construction device provided with the lower auger and the upper auger to the leader of the crane disposed in the vertical direction on the ground to the pile construction position Dosing step; Coupling the upper end of the lower pile to the lower auger, the upper auger of the lower excavation rod inserted into the lower auger and the lower pile is coupled to the upper auger located above the lower auger, protruding to the lower portion of the lower pile A mounting step of mounting the jetting drilling bit on the lower end of the lower drilling rod; The injection-type drilling bit receives the driving force from the upper auger and forwards the injection at high pressure while rotating forwardly to form an excavation hole by expanding the excavation larger than the outer diameter of the injection-type drilling bit, and the lower auger forms the lower pile in the drilling hole. A lower pile construction step of press-fitting the construction; A lower separation step of separating the lower auger from the lower pile and the upper auger from the lower drilling rod; In the state in which the intermediate drilling rod is inserted into the inside of the intermediate pile, and positioned above the lower pile, the lower end of the intermediate drilling rod is coupled to the upper end of the lower drilling rod, and the lower end of the intermediate pile is An intermediate pile and intermediate drilling rod joint step of coupling to an upper end, coupling an upper end of the intermediate pile to the lower auger, and coupling an upper end of the intermediate drilling rod to the upper auger; The injection-type drilling bit receives the driving force from the upper auger and injects the jet at high pressure while rotating forwardly to form an excavation hole by expanding the excavation larger than the outer diameter of the injection-type drilling bit, and the lower auger forms the intermediate pile in the drilling hole. Intermediate pile construction step of pressing the construction; An intermediate separation step of separating the lower auger from the intermediate pile and the upper auger from the intermediate drilling rod; In a state where the upper drilling rod is inserted into the upper pile in the upper pile, the lower end of the upper drilling rod is coupled to the upper end of the intermediate drilling rod, and the lower end of the upper pile is An upper pile and an upper drilling rod joint step of coupling to an upper end, coupling an upper end of the upper pile to the lower auger, and coupling an upper end of the upper drilling rod to the upper auger; The injection-type drilling bit receives the driving force from the upper auger and sprays the jet at high pressure while rotating forward to form an excavation hole by expanding the excavation hole larger than the outer diameter of the injection-type drilling bit, and the lower auger forms the upper pile in the drilling hole. An upper pile construction step of press-fitting the construction; A grouting step in which the spraying drilling bit grouts the cement milk through the spray nozzle to the inner wall of the lower end of the drilling hole; A drawing step of the upper auger rotating the jetting drilling bit to draw the jetting drilling bit and the drilling rod through a plurality of piles; And a step of removing the lower auger from the upper pile and then hitting the upper portion of the upper pile to seat the lower end of the lower pile on the grouted support layer. It provides a file construction method using a spray-type excavation bit comprising a.

In the pile construction method using the injection type drilling bit according to the present invention, the injection type drilling bit includes a main body, a fixed bit and a plurality of injection nozzles. One side of the main body is connected to the excavating rod, and rotates by receiving a rotational force from the excavating rod. The fixing bit is installed at the lower end of the main body. The plurality of spray nozzles are installed in a portion of the main body in which the fixing bit is installed to inject high pressure air, high pressure water or cement milk out of the outer surface of the main body.

In the pile construction method using the injection type drilling bit according to the present invention, in the lower pile, intermediate pile and upper pile construction step, the injection is injected at a high pressure from the injection nozzle of the injection type drilling bit is high pressure air, high pressure water or cement Milk may be included.

In the pile construction method using the injection-type drilling bit according to the invention, the intermediate pile and intermediate drilling rod coupling step, the intermediate pile construction step and the intermediate separation step before the upper pile and the upper drilling rod joint step The operation may be repeatedly performed corresponding to the number of the plurality of intermediate files to be connected to the file.

In the pile construction method using the spray type drilling bit according to the present invention, a concrete pile may be used as the lower pile and the intermediate pile, and a steel pile may be used as the upper pile.

In the pile construction method using the jetting drilling bit according to the present invention, connecting bands are formed at both ends of the lower pile, the intermediate pile and the upper pile. The outer side of the connection band of the lower pile, the intermediate pile and the upper pile which are in contact with each other may be surrounded by a plurality of connection plates, and then may be connected by fastening with a connection bolt.

And in the pile construction method using the injection-type drilling bit according to the present invention, the injection-type drilling bit is performed before the lower pile construction step, the step of confirming the state of the injection nozzle by injecting high pressure air through the injection nozzle It may further include;

According to the present invention, since injection nozzles for injecting high pressure air, high pressure water, and cement milk are provided in the main body portion between the plurality of fixing bits, an injection such as high pressure water or cement milk in the injection nozzle with rotation of the fixing bits. Excavation can be carried out while spraying, so that the expansion excavation can be effectively performed than the outer diameter of the excavation bit.

In addition, when the two ends of the plurality of files are connected to each other, it is connected by using a bolt fastening method using a plurality of connecting plates and connecting bolts, it is possible to construct by connecting the files of different types in a non-welding manner. In particular, since the pile is connected using a connection plate and a bolt, the assembly is excellent and the work process can be simplified.

In addition, the pile construction according to the present invention is to be dug with the pile through the inside of the pile to construct the pile, not only can construct a large diameter pile of 700mm to 1200mm, but also reduce the air and construction cost of pile construction.

In addition, when constructing a plurality of piles, construct a concrete pile with excellent tip support on the solid support layer of the ground, and construct a steel pile on the part close to the ground where the bending moment, axial force and shear force are largely applied. It can reliably reinforce the ground while using less files than the existing one.

1 is a view showing a pile construction apparatus using a jetting drilling bit according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion A of FIG. 1.
3 is a front view showing the jetting drilling bit of FIG.
4 is a bottom view of FIG. 3.
5 is an exploded perspective view illustrating a coupling state between the piles of FIG. 1.
Figure 6 is a flow chart according to the pile construction method using a jetting drilling bit according to an embodiment of the present invention.
7 to 19 are diagrams illustrating steps according to the file construction method of FIG. 6.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention. In the following description, only parts necessary for understanding the operation according to the embodiment of the present invention will be described, it should be noted that the description of other parts will be omitted so as not to distract from the gist of the present invention.

The terms or words used in the specification and claims described below should not be construed as being limited to the ordinary or dictionary meanings, and the inventors are appropriate to the concept of terms in order to explain their invention in the best way. It should be interpreted as meanings and concepts in accordance with the technical spirit of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one preferred embodiment of the present invention, and do not represent all of the technical idea of the present invention, various modifications that can be substituted for them at the time of the present application It should be understood that there may be equivalents and variations.

1 is a view showing a pile construction apparatus using a jetting drilling bit according to an embodiment of the present invention. FIG. 2 is an enlarged view of a portion A of FIG. 1.

1 and 2, in the embodiment of the present invention, the pile construction device 100 excavates using an injection type drilling bit 20 through the interior of the pile 19 to pile the pile 19 into the support layer in the ground. It is a device to be installed on.

The pile construction apparatus 100 according to the present embodiment includes a crane 12 having a leader 11, a bottom auger 13, a top auger 15, and a jetting drilling bit 20. It is configured to include). In addition, the injection-type drilling bit 20 may further include a provision for providing high pressure air, high pressure water, or cement milk.

The crane 12 is provided with a leader 11 having a predetermined height in a direction perpendicular to the ground 71 on one side. The leader 11 guides the vertical movement of the lower auger 13 and the upper auger 15. For example, a reader having a vertical length of 30 m may be used as the reader 11, but is not limited thereto.

The lower auger 13 is installed in the reader 11 and moves up and down along the reader 11, and at least one pile 19 is fastened to the lower portion. That is, the lower auger 13 is a portion to which the pile 19 to be constructed is connected and performs a function of moving the pile 19 below the excavation hole 73 according to the excavation of the injection type drilling bit 20. At this time, the lower auger 13 is provided with a motor, and moves downward along the excavation hole 73 formed while rotating the pile 19 at a constant speed according to the driving of the motor.

The upper auger 15 is installed in the reader 11 above the lower auger 13 and moves up and down along the leader 11. The upper auger 15 is fastened to the excavation rod 17 is inserted into the pile 19 coupled to the lower auger (13). The upper auger 15 transmits rotational force to the fastening drilling rod 17 to drive the injection type drilling bit 20. At this time, the upper auger 15 is provided with a motor, and the pile 19 is installed while the excavating rod 17 is rotated forward (counterclockwise) or reversely (clockwise) according to the driving of the motor.

At this time, when the lower and upper augers 13 and 15 move along the leader 11, the lower and upper augers 13 and 15 move together when the pile 19 is inserted into the excavation hole 73. Can move independently of one another.

Since the excavation rod 17 is spirally formed in the longitudinal direction on the outer circumferential surface, the excavation rod 17 is discharged out through the inside of the pile 19 for constructing the earth and sand generated during excavation.

And the injection-type drilling bit 20 is fastened to the end of the drilling rod 17 protruded to the bottom of the pile 19. Therefore, the injection-type drilling bit 20 receives the rotational force through the drilling rod 17 to perform the drilling construction. At this time, the injection-type drilling bit 20 performs the excavation construction while injecting high-pressure air, high pressure water or cement milk and the injection that are delivered through the excavation rod 17.

In particular, the injection-type drilling bit 20 injects or stops the injection in accordance with the rotation direction of the drilling rod 17. That is, when the excavation rod 17 is rotated forward for the pile construction, the injection-type excavation bit 20 performs the excavation by expanding the excavation radius while spraying the high pressure injection to ensure that the pile 19 is installed stably. At this time, the rotation radius of the injection-type drilling bit 20 may be enlarged to correspond to the outer diameter of the pile 19. After the completion of the excavation, the reverse rotation of the excavation rod 17 stops the injection of the injection, and raises the upper auger 15 along the leader 11 to raise the pile 19 through the inside of the pile 19. Draw out). That is, the jetting drilling bit 20 may be drawn out to the outside through the interior of the pile 19, it is preferable that the size of the jetting drilling bit 20 is smaller than the size of the inner hole of the pile 19.

As described above, the pile construction device using the injection type drilling bit according to the present embodiment is used to construct a pile by digging along with the pile through the inside of the pile, and thus, a pile of 700 mm to 1200 mm in diameter, as well as pile construction. It can also reduce air and construction costs.

This injection type drilling bit 20 according to the present embodiment will be described with reference to FIGS. 2 to 4 as follows. 3 and 4 are views showing the injection type drilling bit 20 of FIG.

The injection type drilling bit 20 is an excavation bit including an injection nozzle 50 for injecting or stopping the injection according to the rotation direction of the excavation rod (17 in FIG. 2), and the main body 30 and the fixed bit 40 ) And a spray nozzle 50.

The main body 30 is one side is connected to the excavation rod 17, rotates by receiving a rotational force from the excavation rod (17). At this time, the main body 30 is a tubular shape having a predetermined length, and includes a fastening portion 31 to which the excavating rod 17 is connected to one side, that is, the upper end.

The fixing bit 40 is installed at the lower end of the main body 10. In this case, the fixed bit 40 includes a bit wing 41 and a plurality of bits 43. The bit wing 41 is provided in the outer peripheral surface of the main body 30, and is formed corresponding to the helical direction of the screw wing 17d of the drilling rod 17. As shown in FIG. The plurality of bits 43 are provided at the lower end of the bit blade 41. At this time, a pair of bit wings 41 may be installed on the outer circumferential surface of the main body 30, the fixing bit 40 excavates the lower portion of the main body 30 in accordance with the rotation of the main body (30).

And the injection nozzle 50 is installed in the portion of the main body 30, the fixed bit 40 is installed, and sprays an injection, such as high pressure air, high pressure water or cement milk out of the outer surface of the main body 30. In this case, a pair of spray nozzles 50 may be installed in the main body 30, and may be installed in a portion in which the main body 30 is exposed to the outside between the pair of bit wings 41. The pair of spray nozzles 50 may be installed at positions opposite to each other about the rotation axis of the main body 30.

In particular, the injection nozzle 50 is opened and closed in accordance with the rotation direction of the excavation rod 17 to inject the injection or stop the injection. For example, when the excavation rod 17 is rotated forward to excavate, the spray nozzle 50 ejects the spray. In the case of the reverse rotation to draw the injection type drilling bit 20 after completion of the excavation, the injection nozzle 50 is blocked to stop the injection of the injection.

Referring to the operation relationship according to the reverse rotation and the forward rotation of the injection-type drilling bit 20 according to this embodiment as follows.

First, as shown in FIGS. 2 to 4, when the main body 30 connected to the drilling rod 17 rotates forward, the fixing bit 40 is excavated while rotating forward, and the injection nozzle 50 sprays the sprayed material. The size of the excavation hole 73 is enlarged. As a result, the injection-type drilling bit 20 may form the drilling hole 73 larger than the outer diameter R2 of the pile. At this time, the size of the excavation hole 73 may be adjusted by the type and the injection pressure of the injection sprayed from the injection nozzle (50).

On the contrary, when the main body 30 connected to the drilling rod 17 reversely rotates, the fixing bit 40 stops the drilling while the reverse rotation rotates, and the injection nozzle 50 stops the injection of the sprayed material. At this time, the turning radius of the fixing bit 40 is smaller than the inner diameter R1 of the pile 19 so that the injection-type drilling bit 20 can be drawn out through the inside of the pile 19.

Meanwhile, the pile 19 constructed in the excavation hole 73 includes a lower pile 19a, an intermediate pile 19b, and an upper pile 19c as shown in FIG. 19. Concrete piles may be used for the lower pile 19a and intermediate pile 19b, and steel piles may be used for the upper pile 19c. The reason why the plurality of piles 19 are combined and constructed is as follows. Construct the concrete pile with excellent tip support force on the solid support layer of the ground, and the steel portion close to the ground where the bending moment, axial force and shear force are largely applied. This is because by constructing the pile, it is possible to reliably reinforce the ground while using fewer piles than before.

In addition, when connecting both ends of the plurality of piles 19, as shown in Figure 5, because the bolt fastening method using the connection plate 12 is used, different kinds of files 19a, 19b in a non-welding manner ) Can be connected to each other in construction. That is, lower connecting bands 18 and upper connecting bands 16 are formed at both ends of the lower pile 19a, the intermediate pile 19b, and the upper pile. The outer side of the lower and upper connecting bands 16 and 18 of the lower pile 19a, the intermediate pile 19b, and the upper pile, which are in contact with each other, surround the plurality of connecting plates 12, and then tighten by connecting bolts 14. Can be. For example, in FIG. 5, the upper connecting band 16 of the lower pile 19a and the lower connecting band 18 of the intermediate pile 19b are fastened with a plurality of connecting plates 12 and connecting bolts 14. Shown. In this way, the plurality of piles 19a and 19b are connected in a non-welding manner by using the connection plate 12 and the connection bolts 14, so that the assembly is excellent and the work process can be simplified.

On the other hand, when coupling the upper end of the pile 19 to the lower auger 13, the connection plate 12 and the connection bolt 14 can be used as in the case of connecting the pile 19. In this case, the upper auger 13 may be directly coupled to the lower auger 13, but the pile 19 may be coupled to the lower auger 13 through a joint. In this case, the joint and the upper connecting band 16 of the pile 19 are connected using the connecting plate 12 and the connecting bolt 14.

The pile construction method using the injection-type drilling bit 20 according to the present embodiment will be described with reference to FIGS. 1 to 19. 6 is a flow chart according to the pile construction method using the injection-type drilling bit 20 according to an embodiment of the present invention. 7 to 19 are diagrams illustrating steps according to the file construction method of FIG. 6.

First, as shown in FIG. 1, the process starts with the step of putting the pile construction apparatus 100 according to the present embodiment to the place where the pile 19 is to be constructed in step S81. That is, the crane 12 provided with the lower auger 13 and the upper auger 15 in the leader 11 is moved to a position where the pile 19 is to be constructed. In addition, a plurality of excavation rod 17, the injection type drilling bit 20, the injection type drilling bit 20 is supplied with a provision for providing high pressure air, high pressure water or cement milk.

Subsequently, a plurality of piles 19 to be constructed are loaded into the file construction apparatus 100 in step S82. In this case, the plurality of piles 19 includes a plurality of concrete piles and steel piles. As shown in FIG. 19, the file located at the bottom of the plurality of files 19 to be constructed is the lower file 19a, the file located close to the ground 71 is the upper file 19c, and the lower file. The file connecting the upper file 19a and the upper file 19c to each other is called an intermediate file 19b. At least one pile 19 may be used depending on the depth in which the pile 19 is constructed. Concrete piles may be used as the lower and intermediate piles 19a and 19b, and steel piles may be used as the upper pile 19c. Here, the concrete pile may be a prestressed spun high strength concrete pile (PHC).

Next, as shown in FIGS. 1 and 7, in step S83, the jetting drilling bit 20, the lower drilling rod 17a, and the lower pile 19a are mounted on the pile construction device 100. That is, the upper end of the lower pile 19a is coupled to the lower auger 13. The upper end of the lower drilling rod 17a inserted into the lower auger 13 and the lower pile 19a is coupled to the upper auger 15 positioned above the lower auger 13. The spray type drilling bit 20 is mounted on the lower end of the lower drilling rod 17a protruding to the lower portion of the lower pile 19a.

For example, when the lower pile 19a and the lower drilling rod 17a are installed in the lower auger 13 and the upper auger 15, the lower drilling rod 17a is inserted into the lower pile 19a using an auxiliary crane. Can be lifted into the state and moved under the lower auger 13. In this state, the upper end of the lower pile 19a is coupled to the lower auger 13. The upper end of the lower drilling rod 17a protruding toward the upper auger 15 through the lower auger 13 is coupled to the upper auger 15. Then, the injection type drilling bit 20 is mounted on the lower drilling rod 17a protruding to the lower portion of the lower pile 19a.

Next, as shown in FIG. 7 to FIG. 10, the lower pile 19a is press-fitted while digging the injection type drilling bit 20 in the forward rotation in step S84. That is, when the injection type drilling bit 20 receives the driving force from the upper auger and moves downward while starting the forward rotation, the excavation of the ground 71 by the fixing bit 40 is started. In addition, the spray is injected at a high pressure from the spray nozzle 50 to enlarge the size of the excavation hole 73 to be formed by the fixing bit 40. And the lower auger presses the lower pile 19a into the excavation hole 73 and constructs it.

In this case, in step S84, the injection type drilling bit 20 may inject high pressure air, high pressure water, or cement milk as an injection through the injection nozzle 50. For example, by injecting high pressure air or high pressure water into the inner wall of the excavation hole 73 and disturbing the ground, the enlargement of the excavation hole 73 can be facilitated. The injection strength of the high pressure air or the high pressure water injected into the injection nozzle 50 is determined in consideration of the size of the soil and the expansion of the excavation hole 73. The spray intensity can be determined between 30 and 100 kg / cm ² .

Alternatively, the cement ground may be sprayed to uniformly improve the target ground of the excavation hole 73 to form a semi-permanent order wall or to reinforce the soft ground.

The lower auger may be press-fitted into the excavation hole 73 while the lower pile 19a is rotated forward so that the lower pile 19a can be easily press-fitted into the excavation hole 73.

Meanwhile, before performing step S84, the injection type drilling bit 20 may perform the step of confirming the state of the injection nozzle 50 by spraying high pressure air through the injection nozzle 50. That is, in order to check the state of the injection type drilling bit 20 before the actual drilling and pile construction, the state of the injection nozzle 50 may be confirmed by spraying high pressure air through the injection nozzle 50. In addition, while the injection type drilling bit 20 is rotated forward or reverse, the driving force is accurately transmitted from the upper auger to the injection type drilling bit 20, it can be confirmed whether the fixed bit 40 and the injection nozzle 50 is operating normally.

Next, in step S85, the lower auger is separated from the lower pile 19a, and the upper auger is separated from the lower drilling rod 17a. That is, after completion of the construction of the lower pile 19a, in order to connect the intermediate pile 19b for construction, the lower auger is separated from the lower pile 19a and then raised along the leader. In addition, the upper auger is separated from the lower drilling rod 17a and then raised along the leader. At this time, the position of the lower auger with respect to the lower pile 19a is the intermediate pile 19b and the intermediate drilling so that the lower pile 19a and the lower auger can be connected through the intermediate pile 19b and the intermediate drilling rod 17b. The position is higher than the length of the rod 17b. Since the length of the intermediate drilling rod 17b is typically longer than the length of the intermediate pile 19b, the lower auger for the lower pile 19a is positioned higher than the length of the intermediate drilling rod 17b.

Next, as shown in FIG. 11, the intermediate drilling rod 17b is connected to the upper end of the lower drilling rod 17a in step S86. 5 and 11, the intermediate pile 19b is connected to the lower pile 19a with the connection plate 12 in step S87. That is, the auxiliary drilling crane is positioned above the lower pile 19a in the state in which the intermediate drilling rod 17b is inserted into the intermediate pile 19b. The lower end of the intermediate drilling rod 17b is coupled to the upper end of the lower drilling rod 17a. The lower connecting band 18 of the intermediate pile 19b is fastened using the plurality of connecting plates 12 and the connecting bolts 14 while being aligned on the upper connecting band 16 of the lower pile 19a. The upper end of the intermediate pile 19b is coupled to the lower auger, and the upper end of the intermediate drilling rod 17b is coupled to the upper auger.

Next, as shown in FIG. 12 and FIG. 13, in step S88, the injection-type drilling bit 20 is rotated in the forward rotation to be excavated and the intermediate pile 19b is press-fitted. At this time, since the construction of the intermediate pile 19b in step S88 is performed in the same manner as the construction of the upper pile 19a in step S84, detailed description thereof will be omitted.

Next, in step S89, the lower auger is separated from the intermediate pile 19b, and the upper auger is separated from the intermediate drilling rod 17b. At this time, since step S89 is performed in the same manner as step S85, detailed description thereof will be omitted. At this time, the position of the lower auger relative to the intermediate pile 19b is the upper pile 19c and the upper drilling so that the intermediate pile 19b and the lower auger can be connected through the upper pile 19c and the upper drilling rod 17c. The position is higher than the length of the rod 17c.

Next, as shown in FIG. 14, the upper drilling rod 17c is connected to the intermediate drilling rod 17b in step S90. At this time, since step S90 is performed in the same manner as step S86, a detailed description thereof will be omitted.

Next, as shown in FIG. 14, the upper pile 19c is connected to the intermediate pile 19b with the connection plate in step S91. At this time, since step S91 is performed in the same manner as step S87, a detailed description thereof will be omitted.

Next, as shown in FIGS. 15 and 16, in step S92, the injection-type drilling bit 20 is rotated in the forward rotation to be excavated and the upper pile 19c is press-fitted. At this time, since step S92 is performed in the same manner as step S88, a detailed description thereof will be omitted. The lower end of the lower pile 19a is inserted into the front end of the excavation hole 73 formed in the support layer 75.

Next, as shown in FIG. 16, in step S93, the injection type drilling bit 20 sprays the cement milk 97 through the injection nozzle 50 to grout the lower end of the drilling hole 73. That is, after completion of the construction up to the upper pile 19c, grouting is performed to secure the supporting force of the plurality of piles 19a, 19b, and 19c with respect to the support layer 75.

Subsequently, as shown in FIGS. 17 and 18, in step S94, the injection-type drilling bit 20 is reduced in reverse rotation, and then the injection-type drilling bit 20 and the drilling rods 17a, 17b, and 17c are drawn and dismantled. . At this time, the turning radius of the fixing bit 40 is smaller than the inner diameter R1 of the pile 19. Therefore, the injection-type drilling bit 20 can be drawn through the inside of the piles 19a, 19b, and 19c.

Next, as shown in FIG. 18, when the upper auger rises along the leader, the injection-type drilling bit 20 and the plurality of drilling rods 17a, 17b, 17c through the interior of the plurality of piles 19a, 19b, 19c. ) Are drawn from the plurality of files 19a, 19b, 19c.

The jetted drilling bit 20 and the plurality of drilling rods 17a, 17b, 17c are then dismantled in the upper auger. In addition, the lower auger is separated from the upper pile 19c. At this time, the upper portion of the upper pile 19c has a state protruding from the ground 71 to a predetermined height.

And, as shown in FIG. 19, the construction of the pile is completed by beating the upper pile 19c in step S95. That is, the lower end of the lower pile 19a is seated on the support layer 75 on which the grouted drilling hole 73 is formed by beating the upper portion of the upper pile 19c protruding from the ground 71 with a hydraulic hammer.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to aid understanding, and are not intended to limit the scope of the present invention. In addition to the embodiments disclosed herein, it is apparent to those skilled in the art that other modifications based on the technical idea of the present invention may be implemented. On the other hand, the present embodiment discloses an example of constructing a pile on the ground of a building site, but is not limited thereto. For example, it can be applied to places where large-diameter pile construction is required, such as land bridges, high-rise buildings, plants, and ports.

11: reader 12: connection plate
13: lower auger 14: connection bolt
15: upper auger 16: upper connection band
17: excavation rod 17a: lower excavation rod
17b: intermediate drilling rod 17c: upper drilling rod
17d: screw wing 18: lower connection band
19: File 19a: Subfile
19b: intermediate file 19c: upper file
20: injection type drilling bit 30: main body
31: fastening portion 40: fixed bit
41: Beat Wings 43: Beat
50: spray nozzle 71: ground
73: excavation hole 75: support layer
97: cement milk 100: file construction device

Claims (7)

In the pile construction method using the injection type drilling bit,
An input step of inserting a pile construction device provided with a lower auger and an upper auger into a position where a pile is to be constructed, to a leader of a crane arranged perpendicular to the ground;
Coupling the upper end of the lower pile to the lower auger, the upper auger of the lower drilling rod inserted into the lower auger and the lower pile is coupled to the upper auger located above the lower auger, protruding to the lower portion of the lower pile A mounting step of mounting the jetting drilling bit on the lower end of the lower drilling rod;
The injection-type drilling bit receives the driving force from the upper auger and forwards the injection at high pressure while rotating forwardly to form an excavation hole by expanding the excavation larger than the outer diameter of the injection-type drilling bit, and the lower auger forms the lower pile in the drilling hole. A lower pile construction step of press-fitting the construction;
A lower separation step of separating the lower auger from the lower pile and the upper auger from the lower drilling rod;
In the state in which the intermediate drilling rod is inserted into the inside of the intermediate pile, and positioned above the lower pile, the lower end of the intermediate drilling rod is coupled to the upper end of the lower drilling rod, and the lower end of the intermediate pile is An intermediate pile and intermediate drilling rod joint step of coupling to an upper end, coupling an upper end of the intermediate pile to the lower auger, and coupling an upper end of the intermediate drilling rod to the upper auger;
The injection-type drilling bit receives the driving force from the upper auger and injects the jet at high pressure while rotating forwardly to form an excavation hole by expanding the excavation larger than the outer diameter of the injection-type drilling bit, and the lower auger forms the intermediate pile in the drilling hole. Intermediate pile construction step of pressing the construction;
An intermediate separation step of separating the lower auger from the intermediate pile and the upper auger from the intermediate drilling rod;
In a state where the upper drilling rod is inserted into the upper pile in the upper pile, the lower end of the upper drilling rod is coupled to the upper end of the intermediate drilling rod, and the lower end of the upper pile is An upper pile and an upper drilling rod joint step of coupling to an upper end, coupling an upper end of the upper pile to the lower auger, and coupling an upper end of the upper drilling rod to the upper auger;
The injection-type drilling bit receives the driving force from the upper auger and sprays the jet at high pressure while rotating forward to form an excavation hole by expanding the excavation hole larger than the outer diameter of the injection-type drilling bit, and the lower auger forms the upper pile in the drilling hole. An upper pile construction step of press-fitting the construction;
A grouting step in which the spraying drilling bit grouts the cement milk through the spray nozzle to the inner wall of the lower end of the drilling hole;
A drawing step of the upper auger rotating the jetting drilling bit to draw the jetting drilling bit and the drilling rod through a plurality of piles;
Separating the lower auger from the upper pile and beating the upper portion of the upper pile to put the lower portion of the lower pile on the grouted support layer;
File construction method using a spray-type excavation bit comprising a. The method of claim 1, wherein the injection type drilling bit,
One side is connected to the excavating rod, the main body to rotate to receive a rotation force from the excavating rod;
A fixed bit installed at a lower end of the main body; And
A plurality of injection nozzles installed in a portion of the main body in which the fixing bit is installed, for injecting high pressure air, high pressure water or cement milk out of the outer surface of the main body;
Pile construction method using a spray-type drilling bit, characterized in that it comprises a. According to claim 2, In the lower pile, intermediate pile and upper pile construction step,
The spraying method is a high pressure injection to the injection nozzle of the injection type drilling bit is pile construction method using the injection type drilling bit, characterized in that containing high pressure air, high pressure water or cement milk. The method of claim 2, wherein before the upper pile and upper drilling rod jointing step,
Pile using the injection type drilling bit, characterized in that for repeating the intermediate pile and the intermediate drilling rod connecting step, the intermediate pile construction step and the intermediate separation step corresponding to the number of the plurality of intermediate piles to be connected to the lower pile Construction method. The method of claim 2,
And the lower pile and the intermediate pile are concrete piles, and the upper pile is a steel pile. The method of claim 2,
Connection bands are formed at both ends of the lower pile, the middle pile and the upper pile,
The outer pile of the connection band of the lower pile, the intermediate pile and the upper pile in contact with each other by surrounding the plurality of connecting plates, and then connected by fastening with a connection bolt, pile construction method using a drilling type drill bit. According to claim 2, which is performed before the lower pile construction step,
Confirming a state of the spray nozzle by spraying the high pressure air through the spray nozzle;
File construction method using a spray-type excavation bit further comprising a.

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