Implant pile

Abstract

To shorten construction time by simultaneously performing ground cutting and grouting.SOLUTION: The present invention relates to an implant pile. A lower end of a first implant pile is provided with a pure direction helix for cutting having a cutting blade together with a drilling head. An upper part of the pure direction helix for stirring is provided. The second implant pile connected to an upper end of the first implant pile is provided with a reverse direction helix for stirring. In a penetration step by drilling and cutting the ground, cement milk is injected, and the cut ground soil and the injected cement milk are sufficiently mixed, so that after the penetration is completed, the mixed ground soil and cement milk harden without going through a separate grouting step. Since the construction is completed only through a head arrangement step and a dynamic load test step, the construction period can be shortened by half.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an implant pile, and more specifically, to an implant pile which is provided with a pure direction helix for cutting at its lower end and a reverse direction helix for stirring above the pure direction helix for cutting, so that when rotating in the pure direction, ground cutting by the pure direction helix for cutting and stirring of the cut ground soil by the reverse direction helix for stirring are performed simultaneously, and a grouting step in which cement milk for grouting is injected to grout the ground is performed in addition to the ground cutting step, thereby reducing the construction period by half. [Background technology]

[0002] Generally, when constructing foundations to support the load of buildings and civil engineering structures, piles are driven into the ground using two methods: the driving method, in which the piles are hammered into the ground, and the pressing method, in which the piles are pressed into the ground using a pressing force.

[0003] However, the conventional driving and press-in methods pose safety and environmental problems due to noise and vibration during construction, so a rotary press-in method has been developed and is now in use.

[0004] In the rotary pressing method, a helical anchor pile is used. The helical pile includes a pipe-shaped helical pile body and a plurality of helices formed on the outer circumferential surface of the helical pile body.

[0005] In addition, the helical pile body is rotated by connecting it to a hydraulic rotating device installed at the end of a backhoe boom, without using large equipment such as an auger drill machine.

[0006] Since it is not possible to increase the height of the equipment for rotating the helical pile, the length of the helical pile is set to about 3m, and when the required penetration depth is deeper than the helical pile, one or more shaft anchor piles (simple pipe-shaped piles without a helix) are connected to the upper end of the helical pile and penetrated.

[0007] The construction method of normal helical piles involves the steps of helical pile penetration, shaft pile connection and penetration, grouting, head preparation, and dynamic load testing. The combination of a specialized hydraulic rotating device and a backhoe makes construction easy, and the construction period can be shortened to 250m / day with integrated pile construction, and the construction quality is excellent. The non-soil, noiseless, and vibrationless construction method not only provides benefits such as construction stability, environmental improvement, and elimination of complaints and disputes at the construction site, but also minimizes ground disturbance when constructing on soft ground and allows construction at an inclined angle.

[0008] However, conventional helical pile construction methods have various problems.

[0009] First, the tip of the helical pile body of the helical pile is cut off at an angle or a conical head with a pointed lower end is attached to make it easier to dig into the ground, but if the bedrock needs to be passed through during the construction process, drilling becomes impossible, making construction impossible.

[0010] Secondly, the helical pile body and shaft anchor pile of the helical pile use piles of the same diameter, and in order to connect the helical pile and the shaft anchor pile, a connecting sleeve is fitted into the upper end of the helical pile body and the lower end of the shaft anchor pile, and a connecting pin that penetrates the connecting sleeve and the helical pile body and the shaft anchor pile is fitted. When multiple shaft anchor piles are used, the shaft anchor piles are connected to each other by fitting a connecting sleeve into the upper end of the lower shaft anchor pile and the lower end of the upper shaft anchor pile, and a connecting pin that penetrates the connecting sleeve and the upper and lower shaft anchor piles is fitted. Since the connecting parts are weak, if a large torque is applied during construction, the connecting parts of the helical pile and the shaft anchor pile may be damaged, resulting in a problem of delays in construction.

[0011] Therefore, there is a need to develop technology that allows construction even when it is necessary to pass through rock, minimizes the drilling load so that large torque is not applied during construction, and allows construction using a small hydraulic rotating device, thereby enabling economical construction.

[0012] As prior art that meets these needs, Korean Patent Registration No. 1552139 (registered on September 4, 2015) "Helical Pile" (hereinafter referred to as "Prior Art") has been disclosed.

[0013] In the above-mentioned prior art, by forming cutouts on the outer periphery of a plurality of helices provided on the helical pile, the resistance of the cut soil can be minimized when penetrating into the ground, by providing cutting blades on the cutouts, the cutting performance of the ground can be improved, by combining a drilling crown having an outer cutting tip and a lower cutting tib made of a material with excellent cutting power at the lower end of the helical pile, the drilling crown drills the ground before the helices cut the ground, so that drilling and cutting of the ground can be performed very efficiently, and therefore construction is possible even when it is necessary to pass through rock during construction, and the burden on cutting the helix is ​​reduced, so that the construction of the helical pile can be performed more quickly, and construction is possible even with a small hydraulic rotating device, making it possible to carry out economical construction.

[0014] However, in the prior art, the helix is ​​configured to cut the ground when rotating in a pure direction, and the inner diameter of the cut hole in the ground formed by the helix is ​​the same as the outer diameter of the helix. Therefore, when cement milk for grouting is injected in the cutting and penetration step using the helix, the helix interferes with the downward flow of the cement milk, and the cut soil and cement milk are not sufficiently mixed. Therefore, the cutting and penetration step and the injection of cement milk for grouting cannot be performed simultaneously. Therefore, the ground must be completely cut and the helical anchor pile must be completely penetrated before the grouting step can be started. This causes a problem that the overall construction period is lengthened by performing the ground cutting step and the grouting step sequentially.

[0015] Therefore, there is a need to develop technology that can shorten the overall construction period by performing the ground cutting step and the grouting step simultaneously. [Prior art documents] [Patent documents]

[0016] Patent Document 1: Republic of Korea Patent No. 1552139 (registered on September 4, 2015) "Helical Anchor Pile" Summary of the Invention [Problem to be solved by the invention]

[0017] The object of the present invention is to provide an implant pile which has a pure directional helix for cutting at its lower end and a reverse directional helix for stirring above the pure directional helix for cutting, so that when rotating in the pure direction, ground cutting by the pure directional helix for cutting and stirring of the cut ground soil by the reverse directional helix for stirring are performed simultaneously, thereby performing a grouting step in which cement milk for grouting is injected to grout the ground, in addition to the ground cutting step, thereby shortening the construction period by half. [Means for solving the problem]

[0018] In order to achieve the above object, the present invention is a first implant pile assembled into a best group and a second implant pile connected to the first implant pile, the first implant pile includes a first implant pile body made of a prototype pipe, a cutting helix connected to a lower end of the first implant pile body, and a stirring reverse helix connected to an upper end of the first implant pile body above the upper cutting helix, the cutting helix is ​​a spiral with one turn and a cutting blade is formed at its lower end, the stirring reverse helix is ​​a spiral with multiple turns, the lower end of the first implant pile body is provided with a drilling head part cut at an angle and having a sharp tip, and the second implant pile is The present invention provides an implant pile comprising a second implant pile body made of a prototype pipe having the same diameter as the first implant pile body, and a mixing reverse helix formed on an outer circumferential surface of the second implant pile body, the pitch of the mixing reverse helix of the first implant pile being smaller than the pitches of the mixing reverse helix of the first implant pile and the mixing reverse helix of the second implant pile, and the outer diameters of the mixing reverse helix of the first implant pile and the mixing reverse helix of the second implant pile are formed smaller than the outer diameter of the cutting pure helix of the first implant pile, so that the outer diameter of the mixing reverse helix is ​​smaller than the inner diameter of a cutting hole in the ground formed by the cutting pure helix. Effect of the Invention

[0019] According to the implant pile of the present invention, a first implant pile has a drilling head and a pure direction helix for cutting with a cutting blade at its lower end, and a reverse direction helix for stirring at its upper part. A second implant pile connected to the upper end of the first implant pile is also provided with a reverse direction helix for stirring. By injecting cement milk in the penetration step of drilling and cutting the ground, the cut ground soil and the injected cement milk are sufficiently mixed. After penetration is completed, when the mixed ground soil and cement milk harden, construction can be completed only by going through the head preparation step and dynamic load test step without going through a separate grouting step, thereby shortening the construction period by half. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 illustrates a preferred embodiment of the present invention, and is a perspective view showing a first implant pile and a second implant pile. [Diagram 2] FIG. 2 illustrates a preferred embodiment of the present invention, showing a left side view of a first implant pile and a second implant pile. [Diagram 3] FIG. 3 illustrates a preferred embodiment of the present invention, and is an exploded perspective view of a first implant pile and a second implant pile. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The implant pile according to the present invention will now be described in more detail with reference to the accompanying drawings.

[0022] The implant pile according to this embodiment includes a first implant pile 100 assembled at the most distal end and a second implant pile 200 connected to the first implant pile 100 .

[0023] The first implant pile 100 includes a first implant pile body 110 consisting of a circular pipe, a forward cutting helix 120 connected to the lower end of the first implant pile body 110, and a reverse stirring helix 130 connected from above the forward cutting helix 120 to near the upper end of the first implant pile body 110.

[0024] The forward cutting helix 120 is configured as a single turn spiral (a right-handed spiral in the drawing), and has a cutting edge 121 formed at its lower end.

[0025] The stirring reverse helix 130 is composed of a spiral (a left-handed spiral in the drawing) with multiple turns (8.5 turns in the drawing).

[0026] Moreover, it is desirable that the pitch P1 of the forward helix 120 for cutting be smaller than the pitch P2 of the reverse helix 130 for stirring.

[0027] In other words, by making the pitch (P1) of the forward cutting helix 120 smaller than the pitch (P2) of the reverse stirring helix 130, the cutting performance of the forward cutting helix 120 is improved, and by making the pitch (P2) of the reverse stirring helix 130 larger than the pitch (P1) of the forward cutting helix 120, the mixing performance of the reverse stirring helix 130, which presses the cut ground soil upward and mixes it, is improved.

[0028] A connecting head 140 for connecting to a hydraulic rotating device (not shown) or a second implant pile 200 is connected to the upper end of the first implant pile body 110 .

[0029] The connecting head 140 consists of a circular pipe having an inner diameter corresponding to the outer diameter of the first implant pile body 110, and is formed with multiple (two in the drawing) connecting pin holes 141 for inserting connecting pins 150.

[0030] The connecting pin 150 may be composed of a pin having a head larger than the inner diameter of the connecting pin hole 141 and a split pin to prevent the pin from accidentally shifting out of the connecting pin hole 141, or it may be composed of a connecting bolt 151 that passes through the connecting pin hole 141 and a connecting nut 152 that is tightened onto the protruding end of the connecting bolt 151, as in the illustrated example.

[0031] The first implant pile body 110 is provided at its lower end with a sharply pointed drilling head 160. The cutting angle of the drilling head 160 is preferably about 45 degrees.

[0032] The second implant pile 200 includes a second implant pile body 210 made of a circular pipe, and a stirring reverse helix 230 coupled to the outer circumferential surface of the second implant pile body 210 .

[0033] The second implant pile body 210 is made of a circular pipe having the same diameter as the first implant pile body 110 .

[0034] The second implant pile body 210 has a connecting pin hole 220 formed at its lower end for connecting to the connecting head 140 of the first implant pile 100 .

[0035] The reverse stirring helix 230 is formed in the same shape as the reverse stirring helix 130 of the first implant pile 100 .

[0036] A connecting head 240 is coupled to the upper end of the second implant pile body 210 for connecting to the lower end of the first implant pile 100 or a hydraulic rotating device (not shown).

[0037] The connecting head 240 is composed of a circular pipe having an inner diameter corresponding to the outer diameter of the second implant pile body 210, and is formed with multiple (two in the drawing) connecting pin holes 241 for inserting the connecting pins 150.

[0038] It is desirable to form the outer diameter (D2) of the stirring reverse helix 130 of the first implant pile 100 and the stirring reverse helix 230 of the second implant pile 200 smaller than the outer diameter (D1) of the cutting forward helix 120 of the first implant pile 100, and to form the outer diameter (D2) of the stirring reverse helices 130, 230 smaller than the inner diameter (DH) of the cutting hole (H) in the ground formed by the cutting forward helix 120, so that the stirring reverse helices 130, 230 do not interfere with the downward flow of cement milk injected for grouting, thereby allowing the downward flow of cement milk to be performed smoothly, and as a result, grouting can be performed efficiently.

[0039] The action of the helical pile according to this embodiment will be described below.

[0040] With the connecting head 140 attached to the upper end of the first implant pile 100 connected to a hydraulic rotation device (not shown) by a connecting pin 120, the backhoe boom is adjusted so that the drilling head portion 160 at the lower end of the first implant pile 100 touches the ground.

[0041] When the hydraulic rotating device to which the first implant pile 100 is connected is operated, the entire first implant pile 100 consisting of the connecting head 140, the first implant pile main body 110, and the drilling head portion 160 rotates.

[0042] Here, the backhoe boom is gradually lowered so that the hydraulic rotating device and the first implant pile 100 are lowered while rotating. The lowering speed of the backhoe boom is maintained at a set speed in accordance with the cutting speed by the cutting pure direction helix 120. Also, in the process of cutting the ground by the cutting forward direction helix 120, when cutting rock due to the hardness of the ground, the cutting speed decreases, so the lowering speed of the backhoe boom is also reduced to perform the work.

[0043] When the hydraulic rotating device and the first implant pile 100 are lowered while rotating, first, the drilling head portion 160 drills a hole in the ground.

[0044] The drilling head 160 drills a hole in the ground, and the cutting blade 121 formed at the lower end of the forward helix 120 for cutting the first implant pile 100 cuts the ground, thereby performing the penetration step of the first implant pile 100.

[0045] When the cutting blade 121 of the forward cutting helix 120 cuts the ground, a cutting hole (H) is formed in the ground, and the cutting hole (H) has an inner diameter (DH) that corresponds to the outer diameter (H1) of the forward cutting helix 120 and is larger than the outer diameter (D2) of the reverse stirring helix 130 (see Figure 2).

[0046] During the penetration step of the first implant pile 100, when cement milk for grouting is injected between the upper end of the drilled hole (H) and the outer peripheral surface of the first implant pile body 110, the cement milk seeps into the gaps in the ground soil cut by the forward cutting helix 120 of the first implant pile 100 and flows downward.

[0047] Here, the stirring reverse helix 130 of the first implant pile 100 and the stirring reverse helix 230 of the second implant pile 200 are formed with an outer diameter smaller than the outer diameter of the cutting forward helix 120. Therefore, during the cutting and penetration process, the outer diameter of the stirring reverse helix 130, 230 is smaller than the inner diameter of the cut hole formed in the ground. Therefore, during the injection of cement milk for grouting, the stirring reverse helix 130 does not interfere with the downward flow of the cement milk, and the downward flow of the cement milk is performed smoothly.

[0048] At the same time, the soil cut by the forward cutting helix 120 is pushed upward and stirred by the reverse stirring helix 130, so that the injected cement milk and the cut soil are sufficiently mixed.

[0049] When the first implant pile 100 has been penetrated near its upper end, the hydraulic rotation device is stopped, the first implant pile 100 is separated from the hydraulic rotation device, the lower end of the second implant pile 200 is connected to the upper end of the first implant pile 100, and then the upper end of the second implant pile 200 is connected to the hydraulic rotation device.

[0050] The first implant pile 100 and the second implant pile 200 are connected by inserting the lower end of the second implant pile 200 into the connecting head 140 connected to the upper end of the first implant pile 100, passing the connecting bolt 151 that constitutes the connecting pin 150 through the bolt through hole 141 of the connecting head 140, and tightening the connecting nut 152 to the protruding end of the connecting bolt 151.

[0051] Next, the connecting head 240 coupled to the upper end of the second implant pile 200 coupled to the upper end of the first implant pile 100 is coupled to a hydraulic rotating device by a connecting bolt 151 and a connecting nut 152 constituting a connecting pin 150.

[0052] In this state, when the hydraulic rotating device is operated and the backhoe boom is lowered, the drilling process by the drilling head 160 of the first implant pile 100 and the ground cutting process by the cutting blade 121 of the forward cutting helix 120 are carried out successively.

[0053] During this process, the mixing reverse helix 130 of the first implant pile 100 and the mixing reverse helix 230 of the second implant pile 200 push the cut ground soil upward and mix it.

[0054] This allows the excavated soil and sand to be thoroughly mixed with the cement milk that is then injected.

[0055] Thereafter, depending on the penetration depth, another second implant pile 200 can be connected to the upper end of the second implant pile 200 and penetrated. When the final second implant pile 200 is connected and penetration is completed, the injection of cement milk, the operation of the hydraulic rotating device, and the lowering of the backhoe boom are stopped.

[0056] Here, the cement milk injected during the penetration process of the initial first implant pile 100 continues to be mixed with the ground soil by the mixing reverse helices 130, 230 until the penetration process of the final second implant pile 200 is completed, so it does not harden until the final penetration is completed, and therefore does not affect the ground drilling by the drilling head 160 and the ground cutting and penetration process by the cutting forward helix 120.

[0057] Once the final penetration is completed, the cement milk for grouting has already been injected into the cut hole (H) during the penetration step of drilling and cutting the ground, and has been thoroughly mixed with the cut ground soil, so there is no need for a separate grouting step. Once the mixed ground soil and cement milk harden, the construction will be completed by going through the head adjustment step and dynamic load test step.

[0058] As described above, in the implant pile according to this embodiment, the lower end of the first implant pile is provided with a pure direction helix for cutting having a cutting blade together with a drilling head, and a reverse direction helix for stirring is provided at its upper part, and the second implant pile connected to the upper end of the first implant pile is provided with a reverse direction helix for stirring. Therefore, in the penetration step of drilling and cutting the ground, by injecting cement milk, the cut ground soil and the injected cement milk are sufficiently mixed. After penetration is completed, when the mixed ground soil and cement milk harden, construction can be completed only by going through the head preparation step and dynamic load test step without going through a separate grouting step, so that the construction period can be shortened by half.

[0059] The embodiments described above are merely examples, and those with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not for limiting the technical idea of the present invention, but for the purpose of explanation, and the scope of the technical idea of the present invention is not limited by such embodiments. The protection scope of the present invention should be analyzed according to the following claims, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

Explanation of Reference Numerals

[0060] 100: First implant pile 110: First implant pile body 120: Cutting pure-direction helix 130: Stirring reverse-direction helix 140: Connecting head 150: Connecting pin 160: Drilling head part 200; Second implant pile 210: Second implant pile body 230: Stirring reverse-direction helix 240: Connecting head

Claims

[Claim 1] The implant pile includes a first implant pile 100 assembled at the most distal end and a second implant pile 200 connected to the first implant pile 100; The first implant pile 100 includes a first implant pile body 110 made of a circular pipe, a forward cutting helix 120 connected to the lower end of the first implant pile body 110, and a reverse stirring helix 130 connected from above the forward cutting helix 120 to near the upper end of the first implant pile body 110, The forward helix 120 for cutting is a right-handed spiral with one turn, and a cutting blade 121 is formed at the lower end. The stirring reverse helix 130 is composed of multiple turns of a left-handed helix, The first implant pile body 110 is provided at its lower end with a drilling head portion 160 that is cut obliquely and has a sharp tip, The second implant pile 200 includes a second implant pile body 210 made of a circular pipe having the same diameter as the first implant pile body 110, and a stirring reverse helix 230 connected to the outer circumferential surface of the second implant pile body 210; The pitch (P1) of the forward cutting helix 120 of the first implant pile 100 is smaller than the pitch (P2) of the reverse stirring helix 130 of the first implant pile 100 and the reverse stirring helix 230 of the second implant pile 200; The outer diameter (D2) of the stirring reverse helix 130 of the first implant pile 100 and the stirring reverse helix 230 of the second implant pile 200 is formed smaller than the outer diameter (D1) of the cutting forward helix 120 of the first implant pile 100, so that the outer diameter (D2) of the stirring reverse helix 130, 230 is smaller than the inner diameter (DH) of the cutting hole (H) in the ground formed by the cutting forward helix 120; A connecting head 140 for connecting to a hydraulic rotating device or a second implant pile 200 is connected to the upper end of the first implant pile body 110, The connecting head 140 is composed of a circular pipe having an inner diameter corresponding to the outer diameter of the first implant pile body 110, The implant pile is characterized in that a plurality of connecting pin holes 141, 220 for inserting connecting pins 150 are formed at the lower ends of the connecting head 140 and the second implant pile body 210.

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