WO2023090543A1 - Composite steel pipe pile provided with reinforced tip and construction method therefor - Google Patents

Composite steel pipe pile provided with reinforced tip and construction method therefor Download PDF

Info

Publication number
WO2023090543A1
WO2023090543A1 PCT/KR2022/004536 KR2022004536W WO2023090543A1 WO 2023090543 A1 WO2023090543 A1 WO 2023090543A1 KR 2022004536 W KR2022004536 W KR 2022004536W WO 2023090543 A1 WO2023090543 A1 WO 2023090543A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel pipe
pipe pile
ground
pile body
support
Prior art date
Application number
PCT/KR2022/004536
Other languages
French (fr)
Korean (ko)
Inventor
임성대
Original Assignee
(주)삼일이엔씨
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by (주)삼일이엔씨 filed Critical (주)삼일이엔씨
Publication of WO2023090543A1 publication Critical patent/WO2023090543A1/en

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/24—Prefabricated piles
    • E02D5/28—Prefabricated piles made of steel or other metals
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/72—Pile shoes

Definitions

  • the present invention is provided with a tip reinforcement portion composed of a cylindrical reinforced base at the bottom of a steel pipe pile body equipped with a ring-shaped support steel plate on the lower outer circumferential surface, so that the helix is not inserted to the bedrock and has a larger allowable bearing capacity than the existing pile. It is about a composite steel pipe pile equipped with a tip reinforcement that can obtain.
  • the helical pile is a pile in which three helixes, which are spiral disks, are provided at regular intervals on the lower rod on the outer circumferential surface of the pile body.
  • the helical pile can be constructed by rotating the ground and then grouting the disturbed ground, and it is adjacent to the cylindrical ground between the upper and lower spiral discs when the tip bearing capacity expressed in the spiral disc when a load is applied and the compression or pulling force after construction is applied.
  • the bearing capacity is exerted by the circumferential frictional force developed between the surrounding ground.
  • Helical piles are usually driven into the ground by using hydraulic devices mounted on small-scale equipment such as backhoes. 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.
  • the helix When using a helical pile for building support, the helix is composed of a diameter in the range of 200 to 300 mm. At this time, the helix located at the bottom needs to be supported on the rock layer above the weathered rock, but it is difficult to secure the pile bearing capacity because it is not easy to insert the tip of the pile to the weathered rock in the state where 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.
  • the micropile requires a casing for protecting the cavity wall in the soft ground section such as weathered soil, and thus is less economical, and since a drilling hole is formed in the weathered rock larger than the diameter of the micropile, hammer strike is unavoidable and there is a risk of civil complaints.
  • the present invention is a composite having a tip reinforcement portion capable of obtaining a larger allowable bearing capacity than the existing pile supported on the support ground by the tip reinforcement portion at the bottom without the helix being inserted to the supporting ground, which is a rock layer.
  • a tip reinforcement portion capable of obtaining a larger allowable bearing capacity than the existing pile supported on the support ground by the tip reinforcement portion at the bottom without the helix being inserted to the supporting ground, which is a rock layer.
  • An object of the present invention is to provide a composite steel pipe pile equipped with a reinforced tip that can replace conventional helical piles or some micro piles by securing sufficient bearing capacity through a reinforced tip, and has excellent workability and economy.
  • the present invention is a steel pipe pile body that is embedded in the ground; A ring-shaped support steel plate formed on the lower outer circumferential surface of the steel pipe pile body; And a cylindrical reinforced base formed by cutting and crushing the ground under the steel pipe pile body and the support steel plate to mix the injection material, and a discharge hole for injecting the injection material into the pulverized support ground provided at the lower end of the steel pipe pile body.
  • a support steel pipe and a tip reinforcement part including a cutting part protruding from the lower outer circumferential surface of the support steel pipe to cut the ground;
  • the cutting part is fixedly coupled to the outer circumferential surface of the support steel pipe, and the tip reinforcement characterized in that it includes a blade having three or more discharge holes for discharging the injection material on the back side in the rotation direction of the cutting part.
  • a composite steel pipe pile equipped with a part.
  • the present invention according to another preferred embodiment provides a composite steel pipe pile equipped with a front end reinforcement, characterized in that the support steel pipe is provided to be movable up and down inside the lower end of the steel pipe pile body.
  • the present invention according to another preferred embodiment provides a composite steel pipe pile equipped with a tip reinforcement, characterized in that the injection material is an expansion material that is expanded by mixing a hardener in the main material.
  • the inside of the support steel pipe is provided with a first accommodating portion of the upper portion in which any one of the main agent and the curing agent is accommodated, and a second accommodating portion of the lower portion in which the other one of the main agent and the curing agent is accommodated, and ,
  • the second receiving portion is in communication with the discharge hole of the support steel pipe, and the composite steel pipe pile having a tip reinforcement portion, characterized in that the injection material is discharged into the discharge hole by the expansion pressure of the injection material when the main material and the hardener are mixed. It provides.
  • the present invention according to another preferred embodiment provides a composite steel pipe pile equipped with a tip reinforcement, characterized in that the first accommodating portion and the second accommodating portion are separated from each other by a separator and the main agent and the hardener are mixed by rupture of the separator. do.
  • the present invention is a composite steel pipe equipped with a front end reinforcement part, characterized in that a separation membrane rupture rod that moves downward by an upper blow to rupture the separation membrane is provided on the upper part of the first accommodating portion so as to be able to slide up and down. provide stakes.
  • an opening and closing stopper inserted into the discharge hole to close the discharge hole inside the second accommodating part is provided at a lower position of the separation membrane rupture rod and pressurized by the separation membrane rupture rod when the separation membrane rupture rod descends. It provides a composite steel pipe pile equipped with a tip reinforcement, characterized in that the discharge hole automatic opening and closing hole consisting of a guide rod descending to the bottom and a connecting wire connecting the guide rod and the opening and closing stopper is provided.
  • the present invention is a composite steel pipe pile equipped with a tip reinforcement, characterized in that a slime inlet hole is provided on the outer circumferential surface of the support steel pipe at the upper portion of the first accommodating portion and the second accommodating portion or the outer circumferential surface of the lower end of the steel pipe pile body provides
  • the present invention is for constructing the composite steel pipe pile equipped with the tip reinforcement, (a) rotating the steel pipe pile body to reach the support ground in the ground, while supporting the lower part of the steel pipe pile body Cutting and crushing the ground to a diameter larger than the steel pipe pile body by the cutting part; And (b) forming a tip reinforcement part including a cylindrical reinforced original ground formed by mixing an injection material with the cut and pulverized ground under the steel pipe pile body; It provides a construction method of a composite steel pipe pile equipped with a tip reinforcement, characterized in that consisting of.
  • the support steel pipe is provided to be movable up and down inside the lower end of the steel pipe pile body, and in the step (a), in the state where the support steel pipe is accommodated inside the lower end of the steel pipe pile body, the steel pipe pile body Construction of a composite steel pipe pile equipped with a tip reinforcement, characterized in that the supporting ground at the bottom of the steel pipe pile body is cut and pulverized by rotating the press-fitting to reach the support ground in the ground and then lowering the support steel pipe to the lower part of the steel pipe pile body while rotating it. provides a way
  • a composite steel pipe pile having a reinforced tip portion comprising a cylindrical reinforced base at the bottom of a steel pipe pile body having a ring-shaped support steel plate on the lower outer circumferential surface and a construction method thereof.
  • the tip reinforcement part having a larger diameter than the steel pipe pile body and exerting a bearing capacity higher than that of weathered rock is provided at the lower part of the steel pipe pile body, it is possible to obtain a higher allowable vertical bearing capacity than the existing pile without inserting a helix into the rock mass, and to exert a bearing capacity higher than that of a micropile.
  • FIG. 1 is a cross-sectional view showing a composite steel pipe pile equipped with a tip reinforcement of the present invention.
  • Figure 2 is a perspective view showing a steel pipe pile body provided with a support steel pipe.
  • Figure 3 is a cross-sectional view showing an embodiment provided with a support steel pipe.
  • Figure 4 is a perspective view showing an embodiment provided with a discharge hole in the cutting portion.
  • FIG. 5 is a view showing an embodiment provided with a movable supporting steel pipe.
  • FIG. 6 is a view showing an embodiment provided with a collapsible cutting part.
  • FIG 7 and 8 are cross-sectional views showing an embodiment provided with an accommodating portion.
  • Figure 9 is a cross-sectional view showing an embodiment provided with a slime inlet hole.
  • FIG. 10 is a view showing a construction method of a composite steel pipe pile equipped with a tip reinforcement of the present invention.
  • the composite steel pipe pile equipped with a tip reinforcement of the present invention includes a steel pipe pile body inserted into the ground; A ring-shaped support steel plate formed on the lower outer circumferential surface of the steel pipe pile body; And a cylindrical reinforced base formed by cutting and crushing the ground under the steel pipe pile body and the support steel plate to mix the injection material, and a discharge hole for injecting the injection material into the pulverized support ground provided at the lower end of the steel pipe pile body.
  • FIG. 1 is a cross-sectional view showing a composite steel pipe pile equipped with a tip reinforcement according to the present invention.
  • the composite steel pipe pile provided with the tip reinforcement of the present invention includes a steel pipe pile main body 2 inserted into the ground 1; A ring-shaped support steel plate 3 formed on the lower outer circumferential surface of the steel pipe pile body 2; And a tip reinforcement portion 4 including a cylindrical reinforced circular ground 41 formed by cutting and pulverizing the ground 1 under the steel pipe pile body 2 and the supporting steel plate 3 and mixing the injection material; It is characterized by consisting of.
  • the present invention is provided with a tip reinforcement portion capable of obtaining a greater allowable bearing capacity than a pile supported on the existing support base 12 by the tip reinforcement portion 4 at the bottom without the helix being inserted to the support base 12, which is a rock layer. It is intended to provide a composite steel pipe pile.
  • the composite steel pipe pile equipped with the tip reinforcement part of the present invention is composed of an upper steel pipe pile body 2 and a lower end reinforcement part 4.
  • the steel pipe pile body 2 can be inserted into the ground 1 by rotary press-fitting.
  • the steel pipe pile body 2 is preferably penetrated through the soft ground 11 at the top and inserted to the top of the supporting ground 12 at the bottom, but in some cases, it may be inserted even to the soil layer.
  • the supporting ground 12 means a bedrock layer of weathered rock or higher.
  • a ring-shaped support steel plate 3 is formed on the lower outer circumferential surface of the steel pipe pile body 2.
  • the support steel plate 3 may be formed in a helix shape.
  • the tip reinforcement part 4 is provided in the lower part of the steel pipe pile body 2 and the support steel plate 3.
  • the front end reinforcement part 4 is configured to include a circular reinforcement base 41 having a cylindrical shape.
  • the reinforcement source ground 41 is reinforced by injecting an injection material after cutting and grinding the ground under the steel pipe pile body 2 and the supporting steel plate 3, and can exert a bearing capacity equal to or higher than the soft rock level.
  • the reinforcing base 41 has an outer diameter larger than the outer diameter of the supporting steel plate 3, so that the lower surface of the supporting steel plate 3 is supported on the upper portion of the reinforcing base 41 to exert a tip bearing capacity.
  • the support steel plate 3 is provided on top of the reinforcement base ground 41. Therefore, when the reinforcement base 41 is formed in the support base 12, which is a bedrock layer, when a compressive force is applied to the pile, a triaxial compressive force acts on the reinforcement base 41, so that the strength of the reinforcement base 41 is greatly increased. As a result, the vertical bearing capacity is improved.
  • the load of the steel pipe pile body 2 is transmitted to the front end reinforcement part 4 at the bottom through the support steel plate 3.
  • the load can be smoothly transferred to the lower ground 1 by the circumferential friction between the outer circumferential surface of the cylindrical reinforcement base 41 constituting the tip reinforcement part 4 and the surrounding ground and the pressure of the lower part of the reinforcement base 41 .
  • the height of the reinforcement base 41 is preferably configured to be at least twice the outer diameter of the supporting steel plate 3.
  • the tip reinforcement part 4 having a larger diameter than the steel pipe pile body 2 and exhibiting a stronger bearing capacity than weathered rock is provided at the lower part of the steel pipe pile body 2, a greater allowable vertical bearing capacity than the existing pile can be obtained. can Therefore, it is possible to secure a sufficient bearing capacity higher than that of the micropile.
  • tip reinforcement part 4 having a large diameter and a large bearing capacity is provided at the lower end of the steel pipe pile body 2, even if only one helix is installed on the top of the tip reinforcement part 4, sufficient allowable vertical bearing capacity is secured. can do. As a result, penetration resistance can be greatly reduced during pile construction, and cost can be reduced by reducing helix attachment costs.
  • the lower support ground 12 is cut and pulverized and used as the main material, so it is economical, and it is constructed by the non-casting rotary press-in method, so it is on-site It is clean and generates little noise and vibration, so there is no concern about civil complaints.
  • Figure 2 is a perspective view showing a steel pipe pile body provided with a support steel pipe
  • Figure 3 is a cross-sectional view showing an embodiment provided with a support steel pipe.
  • the tip reinforcement part 4 has a discharge hole 421 provided at the lower end of the steel pipe pile body 2 and injecting the injection material into the pulverized support ground 12 side.
  • the formed support steel pipe 42 may be further included.
  • a support steel pipe 42 may be provided at the center of the reinforcing original ground 41 in the tip reinforcement part 4.
  • the support steel pipe 42 is formed with a discharge hole 421 on the outer circumferential surface.
  • the reinforcing original ground 41 may be formed by injecting the injection material into the cut and pulverized support ground 12 through the discharge hole 421 formed in the support steel pipe 42.
  • two or more discharge holes 421 are formed on the outer circumferential surface of the support steel pipe 42 so that the injection material is uniformly and smoothly injected into the surrounding cut and crushed ground.
  • the support steel pipe 42 can improve the bearing capacity of the front end reinforcement part 4 by serving as a core material.
  • the front end of the support steel pipe 42 is directly supported on the lower ground 1, so that the load can be smoothly transferred to the ground 1 by the end bearing capacity of the support steel pipe 42.
  • the support steel pipe 42 is preferably configured to have a smaller diameter than the steel pipe pile body 2.
  • the support steel pipe 42 is sufficient as long as it is integrated with the reinforcement base 41 to support the upper vertical load. Therefore, it is preferable to use the diameter of the support steel pipe 42 in the range of 0.5 to 1.0 times the diameter of the steel pipe pile body 2 so that there is no problem with penetration of the support rock while minimizing the penetration resistance, and sufficiently serves as a core material.
  • the supporting steel pipe 42 may have an outer circumferential surface formed in a screw shape to facilitate penetration into the ground.
  • a cutting part 43 for cutting the ground 1 may be protruded from the lower outer circumferential surface of the support steel pipe 42 .
  • the reinforcement source ground 41 formed at the bottom of the steel pipe pile body 2 is the lower ground 1 at the position where the steel pipe pile body 2 is to be constructed by pre-excavating the ground 1 before construction of the steel pipe pile body 2 ), and may be formed first by injecting an injectable material. Thereafter, the steel pipe pile body 2 can be inserted and supported on the upper part of the reinforcement source ground 41.
  • a cutting portion 43 may be protruded from the outer circumferential surface of the support steel pipe 42 .
  • the cutting part 43 can cut and crush the ground 1 around the support steel pipe 42 while the support steel pipe 42 rotates at the same time.
  • the reinforcing base ground 41 may be formed by injecting the injection material into the discharge hole 421 provided on the outer circumferential surface of the supporting steel pipe 42.
  • the cutting part 43 and the supporting steel pipe 42 are rotated and penetrated at a certain depth while cutting the weathered rock. Thereafter, the cut ground is pulverized by rotating the support steel pipe 42 in forward and reverse directions.
  • the reinforced raw ground 41 having a significantly enhanced pile bearing capacity than that of the raw weathered rock can be formed.
  • the cutting portion 43 may be formed to have a size corresponding to the outer diameter of the base ground 41 to be constructed.
  • the cutting part 43 can be formed in various shapes such as a plate shape, a tapered cross-section shape, and a rod shape. At this time, the cutting portion 43 is preferably configured to have a constant penetration angle to obtain the same rotational penetration force as the support steel plate 3.
  • the radius of rotation of the cutting portion 43 is preferably 1 to 2 times the radius of the supporting steel plate 3.
  • the diameter of the reinforced base 41 is equal to or greater than the diameter of the supporting steel plate 3 to sufficiently support the upper load transmitted to the supporting steel plate 3.
  • the diameter of the reinforcement base 41 must be larger than the diameter of the support steel plate 3 to sufficiently support the upper load.
  • the radius of rotation of the cutting portion 43 forming the reinforcing base ground 41 is 3 times or less than the radius of the supporting steel plate 3.
  • a conical tip 422 may be provided at the front end of the support steel pipe 42 to facilitate ground penetration.
  • the cutting part 43 may be composed of a blade 431 having one end fixedly coupled to the outer circumferential surface of the support steel pipe 42 and a crushing tip 432 protruding from the upper or lower surface of the blade 431.
  • the cutting part 43 not only cuts the lower ground of the steel pipe pile body 2, but also crushes the cut soil or bedrock.
  • the cutting part 43 may be composed of a blade 431 and a crushing tip 432.
  • the blade 431 is a part protruding outward of the support steel pipe 42, and cuts the lower ground 1 by the rotation of the support steel pipe 42.
  • the crushing tip 432 protrudes from the upper or lower surface of the blade 431, and homogeneously crushes the cut ground 1.
  • FIG. 4 is a perspective view illustrating an embodiment in which a discharge hole is provided in a cutting part.
  • the blade 431 may be provided with a discharge hole 433 through which the injection material is discharged on the rear side of the cutting unit rotation direction.
  • the discharge hole 433 is provided on the back side of the surface that receives the cutting pressure when the steel pipe pile is rotated forward in the blade 431 of the cut portion 43, the steel pipe pile penetrates downward by rotation, and the discharge hole 433 of the blade 431 Since the injection material is evenly injected into the ground cut and pulverized in ), it is possible to uniformly secure the quality of the tip reinforcement part 4 above a certain level.
  • FIG. 5 is a view showing an embodiment provided with a movable support steel pipe
  • FIG. 6 is a view showing an embodiment provided with a collapsible cutting part.
  • the support steel pipe 42 may be provided to be movable up and down inside the lower end of the steel pipe pile body 2.
  • the support steel pipe 42 may be integrally formed at the lower end of the steel pipe pile body 2.
  • penetration resistance may be large during pile rotation press-fitting.
  • the support steel pipe 42 can be accommodated inside the lower end of the steel pipe pile body 2.
  • the cutting part 43 When the cutting part 43 is formed on the outer circumferential surface of the supporting steel pipe 42, the cutting part 43 may be rotatably coupled to the outer circumferential surface of the supporting steel pipe 42.
  • the cutting part 43 can be rotated downward and accommodated inside the steel pipe pile body 2 in a vertical state.
  • the cutting part 43 When the support steel pipe 42 is lowered, the cutting part 43 may be configured to be naturally rotated in the horizontal direction while being supported on the lower ground 1. In this case, the rotation angle of the cutting part 43 may be limited such that it no longer rotates in a horizontal state.
  • the support steel pipe 42 has a screw thread formed on the outer circumferential surface, and a female screw thread may be formed on the lower inner circumferential surface of the steel pipe pile body 2. Accordingly, the support steel pipe 42 may be screwed to the lower end of the steel pipe pile body 2.
  • the injection material forming the reinforcing base ground 41 may be an expansion material in which a hardener is mixed with a main material and expanded.
  • the reinforcing base 41 may be formed by using cement paste or other solidifying materials as the injection material and mixing with the cut and pulverized ground. In this case, since a certain amount of injection pressure must be applied to inject the injection material into the surrounding ground, separate injection equipment is required.
  • the expansion material can be used as an injection material so that the injection material is discharged from the support steel pipe 42 and injected into the ground that has been cut and pulverized without a separate injection equipment.
  • the injection material which is an expansion material, is discharged from the support steel pipe 42 through the discharge hole 421 by self-expanding pressure, and fills the voids of the ground that has been cut and pulverized to form the ground reinforcement 41.
  • the expansion material has a very fast solidification time, so it is possible to immediately check whether or not it is reinforced after construction.
  • the injection material may use a urethane-based expandable material.
  • the urethane-based expandable material expands in volume by about 8 to 30 times in air depending on the ingredients, the mixing ratio, and the reaction temperature.
  • the expansive material pushes out water and air in the soft ground and fills the voids, transforming the soft ground into a very strong ground.
  • the composite steel pipe pile provided with the tip reinforcement of the present invention may further include a configuration for checking whether the injection material is injected.
  • a confirmation hole 21 for checking the injection state of the injection material may be formed in the lower portion of the support steel plate 3 or the support steel pipe 42 of the steel pipe pile body 2 (FIG. 2).
  • the confirmation hole 21 may be located above the discharge hole 421 .
  • the inside of the steel pipe pile body 2 may be photographed or a detection sensor may be attached to record whether or not the injection material is injected.
  • FIG 7 and 8 are cross-sectional views showing an embodiment provided with an accommodating part.
  • the inside of the support steel pipe 42 includes an upper first receiving portion 44 in which one of the main agent and the curing agent is accommodated, and the other of the main agent and the curing agent is accommodated.
  • a second accommodating part 45 is provided at the lower part, and the second accommodating part 45 communicates with the discharge hole 421 of the support steel pipe 42, so that when the main agent and the curing agent are mixed, the injection material is caused by the expansion pressure of the injection material. may be configured to be discharged through the discharge hole 421 .
  • the injection material may be configured as a two-component type in which expansion is performed by mixing the main agent and the hardener so that the injection material is injected into the surrounding ground (1) at the target point.
  • the ground around the support steel pipe 42 is cut and pulverized by the support steel pipe 42 and the cutting part 43, and then the main material and the hardener separately accommodated in the first accommodating part 44 and the second accommodating part 45 are mixed.
  • the injection material is injected through the discharge hole 42 by the expansion reaction into the cut and crushed surrounding ground.
  • a high-quality pile support layer corresponding to the physical properties of very hard weathered rock or soft rock can be formed within a few minutes.
  • the high specific gravity is injected into the upper first accommodating part 44, and the low specific gravity is injected into the lower secondary accommodating part 45.
  • the second accommodating part 45 communicates with the discharge hole 421 of the support steel pipe 42. Accordingly, when the main material or curing agent of the first accommodating part 44 flows into the second accommodating part 45, the expansion reaction of the injection material starts, and the injection material is discharged through the discharge hole 421 by the self-expanding pressure so that the ground 1 ) is injected into
  • the discharge hole 421 remains closed and opens when the injection material is discharged.
  • the first accommodating part 44 and the second accommodating part 45 are separated from each other by the separator 46, and the main agent and the curing agent may be mixed by the rupture of the separator 46.
  • the first receiving part 44 and the second receiving part 45 can be separated from each other by a separator 46 so that the main material and the hardener can be self-mixed and injected inside the support steel pipe 42 without separate external injection equipment. there is.
  • the separation membrane 46 is formed of a material that can be easily ruptured by a worker after completing the press-fitting of the steel pipe pile.
  • the upper main agent or curing agent flows into the lower portion, is mixed with each other, expands, and is injected into the surrounding ground 1 through the discharge hole 421.
  • a separation membrane rupturing rod 47 that moves downward by an upper blow and ruptures the separation membrane 46 may be provided above the first accommodating part 44 so as to be slidable up and down.
  • the support steel pipe 42 is located at the tip of the pile, it may be difficult for a worker to directly rupture the separator 46 with a general tool.
  • a separator rupture rod 47 capable of sliding vertically may be provided on the upper portion of the first accommodating part 44 .
  • the membrane rupturing rod 47 may be coupled to the upper portion of the first accommodating part 44 in a manner such as an interference fit.
  • the membrane rupturing rod 47 When the membrane rupturing rod 47 is hit from the top by a method such as dropping a heavy weight 6, the membrane rupturing rod 47 slides downward to the first accommodating part 44 and the second accommodating part. The separation membrane 46 separating the 45 can be easily ruptured.
  • the separator rupture bar 47 may have a sharp lower end to easily rupture the separator 46 .
  • the discharge hole 421 of the support steel pipe 42 should be closed when the steel pipe pile is pressed in and open only when the injection material is injected.
  • the discharge hole 421 is normally closed, but when the separation membrane 46 is ruptured by the separation membrane rupture rod 47, the discharge hole automatic opening/closing port 48 capable of automatically opening the discharge hole 421 is provided in the second accommodating part ( 45) can be provided inside.
  • the discharge hole automatic opening/closing hole 48 may be composed of an opening/closing stopper 481, a guide rod 482, and a connecting wire 483.
  • the opening and closing stopper 481 is inserted into the discharge hole 421 to close the discharge hole 421 .
  • the opening and closing stopper 481 may be provided in plurality to be inserted into each discharge hole 421 .
  • the opening and closing stopper 481 closes the discharge hole 421 to prevent the main material or hardener accommodated in the second accommodating part 45 from leaking out during pile construction and at the same time to block the inflow of external substances into the inside. (FIG. 7).
  • the guide rod 482 is provided at a lower position of the membrane rupturing rod 47 and descends downward by pressing the membrane rupturing rod 47 when the membrane rupturing rod 47 descends.
  • the guide rod 482 is provided at a position directly below the membrane rupture rod 47 at the center of the second accommodating part 45 .
  • the guide rod 482 is connected to the opening/closing stopper 481 fitted into the discharge hole 421 by a connecting wire 483, and is fixed in a position at the center of the second accommodating part 45.
  • the injection hole 421 is opened at the same time as the mixture of the main agent and the curing agent, and the injection material is discharged to the outside of the support steel pipe 42.
  • a mixing blade (not shown) is formed on the outer circumferential surface of the guide rod 482 for rapid and effective mixing of the main agent and the curing agent, or a mixing ball 49 inside the second accommodating part 45. ) and the like may be provided.
  • FIG. 9 is a cross-sectional view showing an embodiment provided with a slime inlet hole.
  • a slime inlet hole 22 may be provided on the outer circumferential surface.
  • the support ground 12 on which the tip reinforcement part 4 is formed is a very hard stratum, and the volume inevitably increases during cutting.
  • the movement of the cutting slime is restricted by the support steel plate 3 on the upper side, so the cutting operation is not easy and may take a lot of time.
  • water or a fluid for reducing friction may be filled in advance in the support steel pipe 42 or the steel pipe pile body 2 so that the introduced cutting slime moves smoothly to the top.
  • water or friction reducing fluid may be provided on the upper portions of the first accommodating part 44 and the second accommodating part 45 .
  • FIG. 10 is a view showing a construction method of a composite steel pipe pile equipped with a tip reinforcement of the present invention.
  • the construction method of the composite steel pipe pile equipped with the tip reinforcement of the present invention relates to the method of constructing the composite steel pipe pile equipped with the tip reinforcement of the present invention described above with reference to FIGS. 1 to 9.
  • the steel pipe pile body 2 equipped with the support steel plate 3 on the outer circumferential surface of the lower end is press-fitted by rotation to reach the support base 12 in the ground.
  • the large-diameter steel pipe pile body 2 and the support steel plate 3 have high penetration resistance, they are inserted only to the vicinity of the upper end of the support ground 12.
  • the ground under the steel pipe pile body 2 is cut and pulverized into a cylindrical shape.
  • the ground to be cut and pulverized here is preferably the supporting ground 12, which is a bedrock layer of weathered rock or higher, but may be a hard soil layer in some cases.
  • the injection material is injected into the cut and pulverized ground under the steel pipe pile body 2 to form a cylindrical reinforced base 41.
  • the ground under the steel pipe pile body 2 is in a very dense state because it is cut and pulverized in a closed space under the supporting steel plate 3. Therefore, when the injection material is injected into the remaining voids, it can exert a bearing capacity twice or more than that of the original ground, and in the case of weathered rock ground, a support layer close to weathered rock or soft rock can be formed.
  • the reinforcing base 41 is formed up to the lower surface of the supporting steel plate 3 to support the load of the supporting steel plate 3.
  • a support steel pipe 42 is provided with a discharge hole 421 for injecting the injection material into the crushed rock ground side, and the ground 1 is formed on the lower outer circumferential surface of the support steel pipe 42.
  • the cutting part 43 for cutting is protruding, so that the supporting ground 12 under the steel pipe pile body 2 can be cut and pulverized by the cutting part 43 in step (a).
  • the support steel pipe 42 rotates together and the cutting portion 43 at the same time
  • the reinforced base ground 41 can be more easily formed.
  • the support steel pipe 42 is provided to be movable up and down inside the lower end of the steel pipe pile body 2, and the support steel pipe 42 is accommodated inside the lower end of the steel pipe pile body 2 in step (a). After the steel pipe pile body 2 is press-fitted by rotation to reach the support ground 12 in the ground, the support steel pipe 42 is rotated and lowered to the lower part of the steel pipe pile body 2 to support the lower part of the steel pipe pile body 2 (12) can be configured to be cut and ground.
  • the reinforcement source ground 41 may be constructed simultaneously when the steel pipe pile body 2 is constructed.
  • the steel pipe pile main body 2 is inserted into the ground in a state where the support steel pipe 42 is accommodated therein and pre-constructed, and then the support steel pipe 42 is lowered and strengthened while rotating. It is also possible to construct the raw ground 41.
  • the end reinforcement having a larger diameter than the steel pipe pile main body and exerting a bearing capacity greater than that of weathered rock is provided at the bottom of the steel pipe pile body, only one helix is installed on the top of the end reinforcement.
  • it has industrial applicability in that it is possible to secure sufficient permissible soft earthquake bearing capacity, greatly reduce penetration resistance during pile construction, and reduce costs by reducing helix attachment costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

The present invention relates to a composite steel pipe pile provided with a reinforced tip, wherein the reinforced tip including reinforced natural ground in a cylindrical shape is provided at the lower portion of a steel pipe pile body provided with a ring-shaped supporting steel plate on the lower circumference thereof, and thus, a greater permissible support force than that of an existing pile can be obtained without inserting a helix into the supporting ground.

Description

선단보강부가 구비된 복합 강관말뚝 및 이의 시공 방법Composite steel pipe pile equipped with tip reinforcement and its construction method
본 발명은 하부 외주면에 링 형상의 지지강판이 구비된 강관말뚝 본체의 하부에 원기둥 형상의 강화원지반을 포함하여 구성되는 선단보강부가 구비됨으로써, 암반까지 헬릭스를 근입하지 않으면서도 기존 말뚝보다 큰 허용지지력을 얻을 수 있는 선단보강부가 구비된 복합 강관말뚝에 대한 것이다.The present invention is provided with a tip reinforcement portion composed of a cylindrical reinforced base at the bottom of a steel pipe pile body equipped with a ring-shaped support steel plate on the lower outer circumferential surface, so that the helix is not inserted to the bedrock and has a larger allowable bearing capacity than the existing pile. It is about a composite steel pipe pile equipped with a tip reinforcement that can obtain.
헬리컬 파일은 파일 본체 외주면에 나선형의 원판인 헬릭스(helix)가 하단 롯드에 일정 간격으로 3개 정도 구비되는 파일이다. 헬리컬 파일은 지반에 회전 관입한 후 교란된 지반을 그라우팅하여 시공할 수 있으며, 하중 재하 시 나선형 원판에서 발현되는 선단지지력과 시공 후 압축 또는 인발력 작용 시 상하 나선형 원판 사이에 있는 원통 형상의 지반과 인접하는 주변 지반 사이에서 발현되는 주면마찰력으로 지지력을 발휘한다.The helical pile is a pile in which three helixes, which are spiral disks, are provided at regular intervals on the lower rod on the outer circumferential surface of the pile body. The helical pile can be constructed by rotating the ground and then grouting the disturbed ground, and it is adjacent to the cylindrical ground between the upper and lower spiral discs when the tip bearing capacity expressed in the spiral disc when a load is applied and the compression or pulling force after construction is applied. The bearing capacity is exerted by the circumferential frictional force developed between the surrounding ground.
이러한 헬리컬 파일은 소음 및 진동이 적고, 경제성과 시공성이 우수하여 신축이나 리모델링 공사 시 기초 보강 등에 많이 사용된다.These helical piles have low noise and vibration and are excellent in economic feasibility and workability, so they are widely used for foundation reinforcement during new construction or remodeling.
헬리컬 파일은 통상 백호 등의 소규모 장비에 장착된 유압장치를 이용하여 지반 내에 회전 관입한다. 이에 파일의 길이가 3m 이내로 제한되는 경우가 많으며, 관입 심도에 따라 다수의 헬리컬 파일을 연결하여 사용한다.Helical piles are usually driven into the ground by using hydraulic devices mounted on small-scale equipment such as backhoes. 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.
건축물 지지 용도로 헬리컬 파일을 사용하는 경우, 헬릭스는 200~300㎜ 정도 범위의 직경으로 구성한다. 이때, 최하단에 위치하는 헬릭스는 풍화암 이상의 암반층에 지지시켜야 하는데, 헬릭스가 구비된 상태에서 파일 선단을 풍화암까지 근입하는 것이 용이하지 않아 말뚝 지지력 확보에 어려움이 있다. 또한, 연약지층을 통과하는 지층에 직경이 작은 헬리컬 파일을 사용할 경우, 헬리컬 파일의 좌굴 발생 우려가 있다.When using a helical pile for building support, the helix is composed of a diameter in the range of 200 to 300 mm. At this time, the helix located at the bottom needs to be supported on the rock layer above the weathered rock, but it is difficult to secure the pile bearing capacity because it is not easy to insert the tip of the pile to the weathered rock in the state where 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.
한편, 종래 마이크로파일은 헬리컬 파일에 비해 말뚝 지지력에 대한 신뢰성이 높다. 반면, 별도의 천공기가 필요하고, 천공 작업시 발생하는 부상토에 대한 처리 공정이 필요하여 시공이 번거로우며 공사비가 증가되는 단점이 있다. On the other hand, conventional micro piles are more reliable for pile bearing capacity than helical piles. On the other hand, there is a disadvantage in that a separate drilling machine is required and a treatment process for floating soil generated during drilling is required, which makes construction cumbersome and increases construction costs.
또한, 마이크로파일은 풍화토 등 연약지반 구간에서 공벽 보호를 위한 케이싱이 필요하여 경제성이 떨어지고, 마이크로파일의 직경 이상으로 풍화암에 천공홀을 형성하므로 해머 타격이 불가피하여 민원 발생 우려가 있다.In addition, the micropile requires a casing for protecting the cavity wall in the soft ground section such as weathered soil, and thus is less economical, and since a drilling hole is formed in the weathered rock larger than the diameter of the micropile, hammer strike is unavoidable and there is a risk of civil complaints.
상기와 같은 문제점을 해결하기 위하여 본 발명은 암반층인 지지지반까지 헬릭스가 근입되지 않으면서도 하부의 선단보강부에 의해 지지지반에 지지되는 기존 말뚝보다 큰 허용지지력을 얻을 수 있는 선단보강부가 구비된 복합 강관말뚝을 제공하고자 한다.In order to solve the above problems, the present invention is a composite having a tip reinforcement portion capable of obtaining a larger allowable bearing capacity than the existing pile supported on the support ground by the tip reinforcement portion at the bottom without the helix being inserted to the supporting ground, which is a rock layer. We want to provide steel pipe piles.
본 발명은 선단보강부를 통한 충분한 지지력 확보로 종래 헬리컬 파일이나 일부 마이크로파일을 대체할 수 있고, 시공성 및 경제성이 우수한 선단보강부가 구비된 복합 강관말뚝을 제공하고자 한다.An object of the present invention is to provide a composite steel pipe pile equipped with a reinforced tip that can replace conventional helical piles or some micro piles by securing sufficient bearing capacity through a reinforced tip, and has excellent workability and economy.
바람직한 실시예에 따른 본 발명은 지반에 근입되는 강관말뚝 본체; 상기 강관말뚝 본체의 하부 외주면에 형성되는 링 형상의 지지강판; 및 상기 강관말뚝 본체와 지지강판 하부의 지반을 절삭 및 분쇄하여 주입재를 혼합함으로써 형성되는 원기둥 형상의 강화원지반, 상기 강관말뚝 본체의 하단에 구비되는 것으로 분쇄된 지지지반 측으로 주입재를 주입하는 토출공이 형성된 지지강관 및 상기 지지강관의 하부 외주면에 돌출 형성되어 지반을 절삭하는 절삭부를 포함하는 선단보강부; 로 구성되고, 상기 절삭부는 지지강관의 외주면에 일단이 고정 결합되는 것으로 절삭부 회전 방향 배면 측에 주입재가 토출되는 토출공이 절삭부 1개당 3개 이상 구비되는 블레이드를 포함하는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝을 제공한다.The present invention according to a preferred embodiment is a steel pipe pile body that is embedded in the ground; A ring-shaped support steel plate formed on the lower outer circumferential surface of the steel pipe pile body; And a cylindrical reinforced base formed by cutting and crushing the ground under the steel pipe pile body and the support steel plate to mix the injection material, and a discharge hole for injecting the injection material into the pulverized support ground provided at the lower end of the steel pipe pile body. A support steel pipe and a tip reinforcement part including a cutting part protruding from the lower outer circumferential surface of the support steel pipe to cut the ground; The cutting part is fixedly coupled to the outer circumferential surface of the support steel pipe, and the tip reinforcement characterized in that it includes a blade having three or more discharge holes for discharging the injection material on the back side in the rotation direction of the cutting part. Provided is a composite steel pipe pile equipped with a part.
다른 바람직한 실시예에 따른 본 발명은 상기 지지강관은 강관말뚝 본체의 하단 내부에서 상하로 이동 가능하게 구비되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝을 제공한다.The present invention according to another preferred embodiment provides a composite steel pipe pile equipped with a front end reinforcement, characterized in that the support steel pipe is provided to be movable up and down inside the lower end of the steel pipe pile body.
다른 바람직한 실시예에 따른 본 발명은 상기 주입재는 주제에 경화제가 혼합되어 팽창되는 팽창재인 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝을 제공한다.The present invention according to another preferred embodiment provides a composite steel pipe pile equipped with a tip reinforcement, characterized in that the injection material is an expansion material that is expanded by mixing a hardener in the main material.
다른 바람직한 실시예에 따른 본 발명은 상기 지지강관의 내부에는 상기 주제와 경화제 중 어느 하나가 수용되는 상부의 제1수용부와 상기 주제와 경화제 중 나머지 하나가 수용되는 하부의 제2수용부가 구비되고, 상기 제2수용부는 상기 지지강관의 토출공과 연통되어 주제와 경화제의 혼합 시 주입재의 팽창압에 의해 주입재가 토출공으로 토출되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝을 제공한다.In the present invention according to another preferred embodiment, the inside of the support steel pipe is provided with a first accommodating portion of the upper portion in which any one of the main agent and the curing agent is accommodated, and a second accommodating portion of the lower portion in which the other one of the main agent and the curing agent is accommodated, and , The second receiving portion is in communication with the discharge hole of the support steel pipe, and the composite steel pipe pile having a tip reinforcement portion, characterized in that the injection material is discharged into the discharge hole by the expansion pressure of the injection material when the main material and the hardener are mixed. It provides.
다른 바람직한 실시예에 따른 본 발명은 상기 제1수용부와 제2수용부는 분리막에 의해 상호 분리되어 분리막의 파열에 의해 주제와 경화제가 혼합되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝을 제공한다.The present invention according to another preferred embodiment provides a composite steel pipe pile equipped with a tip reinforcement, characterized in that the first accommodating portion and the second accommodating portion are separated from each other by a separator and the main agent and the hardener are mixed by rupture of the separator. do.
다른 바람직한 실시예에 따른 본 발명은 상기 제1수용부의 상부에는 상부 타격에 의해 하부로 이동하여 상기 분리막을 파열시키는 분리막 파열봉이 상하로 슬라이딩 가능하게 구비되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝을 제공한다.The present invention according to another preferred embodiment is a composite steel pipe equipped with a front end reinforcement part, characterized in that a separation membrane rupture rod that moves downward by an upper blow to rupture the separation membrane is provided on the upper part of the first accommodating portion so as to be able to slide up and down. provide stakes.
다른 바람직한 실시예에 따른 본 발명은 상기 제2수용부의 내부에는 상기 토출공에 삽입되어 토출공을 폐쇄하는 개폐마개, 상기 분리막 파열봉의 하부 위치에 구비되어 분리막 파열봉의 하강 시 분리막 파열봉의 가압에 의해 하부로 하강하는 가이드봉 및 상기 가이드봉과 개폐마개를 연결하는 연결와이어로 구성되는 토출공 자동개폐구가 구비되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝을 제공한다.In the present invention according to another preferred embodiment, an opening and closing stopper inserted into the discharge hole to close the discharge hole inside the second accommodating part is provided at a lower position of the separation membrane rupture rod and pressurized by the separation membrane rupture rod when the separation membrane rupture rod descends. It provides a composite steel pipe pile equipped with a tip reinforcement, characterized in that the discharge hole automatic opening and closing hole consisting of a guide rod descending to the bottom and a connecting wire connecting the guide rod and the opening and closing stopper is provided.
다른 바람직한 실시예에 따른 본 발명은 상기 제1수용부와 제2수용부 상부의 지지강관 외주면 또는 강관말뚝 본체의 하단 외주면에는 슬라임 유입홀이 구비되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝을 제공한다.The present invention according to another preferred embodiment is a composite steel pipe pile equipped with a tip reinforcement, characterized in that a slime inlet hole is provided on the outer circumferential surface of the support steel pipe at the upper portion of the first accommodating portion and the second accommodating portion or the outer circumferential surface of the lower end of the steel pipe pile body provides
다른 바람직한 실시예에 따른 본 발명은 상기 선단보강부가 구비된 복합 강관말뚝을 시공하기 위한 것으로, (a) 강관말뚝 본체를 회전 압입하여 지중의 지지지반까지 도달시키는 한편, 상기 강관말뚝 본체 하부의 지지지반을 상기 절삭부에 의해 상기 강관말뚝 본체보다 큰 지름으로 절삭 및 분쇄하는 단계; 및 (b) 상기 강관말뚝 본체 하부의 절삭 및 분쇄된 지반에 주입재를 혼합하여 형성되는 원기둥 형상의 강화원지반을 포함하는 선단보강부를 형성하는 단계; 로 구성되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝의 시공 방법을 제공한다.The present invention according to another preferred embodiment is for constructing the composite steel pipe pile equipped with the tip reinforcement, (a) rotating the steel pipe pile body to reach the support ground in the ground, while supporting the lower part of the steel pipe pile body Cutting and crushing the ground to a diameter larger than the steel pipe pile body by the cutting part; And (b) forming a tip reinforcement part including a cylindrical reinforced original ground formed by mixing an injection material with the cut and pulverized ground under the steel pipe pile body; It provides a construction method of a composite steel pipe pile equipped with a tip reinforcement, characterized in that consisting of.
다른 바람직한 실시예에 따른 본 발명은 상기 지지강관은 강관말뚝 본체의 하단 내부에 상하로 이동 가능하게 구비되어, 상기 (a) 단계에서 지지강관이 강관말뚝 본체의 하단 내부에 수용된 상태에서 강관말뚝 본체를 회전 압입하여 지중의 지지지반까지 도달시킨 후 지지강관을 회전시키면서 강관말뚝 본체 하부로 하강시켜 강관말뚝 본체 하부의 지지지반이 절삭 및 분쇄되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝의 시공 방법을 제공한다.In the present invention according to another preferred embodiment, the support steel pipe is provided to be movable up and down inside the lower end of the steel pipe pile body, and in the step (a), in the state where the support steel pipe is accommodated inside the lower end of the steel pipe pile body, the steel pipe pile body Construction of a composite steel pipe pile equipped with a tip reinforcement, characterized in that the supporting ground at the bottom of the steel pipe pile body is cut and pulverized by rotating the press-fitting to reach the support ground in the ground and then lowering the support steel pipe to the lower part of the steel pipe pile body while rotating it. provides a way
본 발명에 따르면 하부 외주면에 링 형상의 지지강판이 구비된 강관말뚝 본체의 하부에 원기둥 형상의 강화원지반을 포함하여 구성되는 선단보강부가 구비된 복합 강관말뚝 및 이의 시공 방법을 제공할 수 있다.According to the present invention, it is possible to provide a composite steel pipe pile having a reinforced tip portion comprising a cylindrical reinforced base at the bottom of a steel pipe pile body having a ring-shaped support steel plate on the lower outer circumferential surface and a construction method thereof.
따라서 강관말뚝 본체 하부에 강관말뚝 본체보다 직경이 크고 풍화암 이상의 지지력을 발휘하는 선단보강부가 구비되므로, 암반까지 헬릭스를 근입하지 않고도 기존 말뚝보다 큰 허용 연직지지력을 얻을 수 있으며, 마이크로파일 이상의 지지력을 발휘할 수 있다.Therefore, since the tip reinforcement part having a larger diameter than the steel pipe pile body and exerting a bearing capacity higher than that of weathered rock is provided at the lower part of the steel pipe pile body, it is possible to obtain a higher allowable vertical bearing capacity than the existing pile without inserting a helix into the rock mass, and to exert a bearing capacity higher than that of a micropile. can
또한, 강화된 선단보강부의 상부에 1개의 헬릭스만 설치하여도 충분한 허용 연직지지력을 확보할 수 있으므로, 말뚝 시공 시 관입 저항을 크게 줄이고 헬릭스 부착 비용 감소로 원가 절감이 가능하다. In addition, since sufficient permissible vertical bearing capacity can be secured even if only one helix is installed on the upper part of the reinforced tip end, it is possible to significantly reduce penetration resistance during pile construction and reduce cost by reducing helix attachment cost.
아울러 강화된 선단보강부를 형성하기 위해 하부 지지지반을 절삭 및 분쇄하여 주재료로 사용하므로 경제적이며, 비배토 회전 압입 공법으로 시공되므로 현장이 깨끗하고 소음·진동이 거의 발생하지 않아 민원 발생 염려가 없다.In addition, it is economical because it is used as the main material by cutting and crushing the lower support ground to form a reinforced tip end, and since it is constructed with the non-casting rotary press-in method, the site is clean and there is little noise or vibration, so there is no concern about civil complaints.
뿐만 아니라 강관말뚝 본체로 직경이 큰 강관을 사용할 수 있으므로, 연약층을 통과하는 경우에도 말뚝의 좌굴 우려가 없다.In addition, since a steel pipe with a large diameter can be used as the main body of the steel pipe pile, there is no risk of buckling of the pile even when passing through a soft layer.
도 1은 본 발명 선단보강부가 구비된 복합 강관말뚝을 도시하는 단면도.1 is a cross-sectional view showing a composite steel pipe pile equipped with a tip reinforcement of the present invention.
도 2는 지지강관이 구비된 강관말뚝 본체를 도시하는 사시도.Figure 2 is a perspective view showing a steel pipe pile body provided with a support steel pipe.
도 3은 지지강관이 구비된 실시예를 도시하는 단면도.Figure 3 is a cross-sectional view showing an embodiment provided with a support steel pipe.
도 4는 절삭부에 토출공이 구비된 실시예를 도시하는 사시도.Figure 4 is a perspective view showing an embodiment provided with a discharge hole in the cutting portion.
도 5는 이동식 지지강관이 구비된 실시예를 도시하는 도면.5 is a view showing an embodiment provided with a movable supporting steel pipe.
도 6은 절첩식 절삭부가 구비된 실시예를 도시하는 도면.6 is a view showing an embodiment provided with a collapsible cutting part.
도 7 및 도 8은 수용부가 구비된 실시예를 도시하는 단면도.7 and 8 are cross-sectional views showing an embodiment provided with an accommodating portion.
도 9는 슬라임 유입홀이 구비된 실시예를 도시하는 단면도.Figure 9 is a cross-sectional view showing an embodiment provided with a slime inlet hole.
도 10은 본 발명 선단보강부가 구비된 복합 강관말뚝의 시공 방법을 도시하는 도면.10 is a view showing a construction method of a composite steel pipe pile equipped with a tip reinforcement of the present invention.
상기와 같은 목적을 달성하기 위하여 이 발명의 선단보강부가 구비된 복합 강관말뚝은 지반에 근입되는 강관말뚝 본체; 상기 강관말뚝 본체의 하부 외주면에 형성되는 링 형상의 지지강판; 및 상기 강관말뚝 본체와 지지강판 하부의 지반을 절삭 및 분쇄하여 주입재를 혼합함으로써 형성되는 원기둥 형상의 강화원지반, 상기 강관말뚝 본체의 하단에 구비되는 것으로 분쇄된 지지지반 측으로 주입재를 주입하는 토출공이 형성된 지지강관 및 상기 지지강관의 하부 외주면에 돌출 형성되어 지반을 절삭하는 절삭부를 포함하는 선단보강부; 로 구성되고, 상기 절삭부는 지지강관의 외주면에 일단이 고정 결합되는 것으로 절삭부 회전 방향 배면 측에 주입재가 토출되는 토출공이 절삭부 1개당 3개 이상 구비되는 블레이드를 포함하는 것을 특징으로 한다.In order to achieve the above object, the composite steel pipe pile equipped with a tip reinforcement of the present invention includes a steel pipe pile body inserted into the ground; A ring-shaped support steel plate formed on the lower outer circumferential surface of the steel pipe pile body; And a cylindrical reinforced base formed by cutting and crushing the ground under the steel pipe pile body and the support steel plate to mix the injection material, and a discharge hole for injecting the injection material into the pulverized support ground provided at the lower end of the steel pipe pile body. A support steel pipe and a tip reinforcement part including a cutting part protruding from the lower outer circumferential surface of the support steel pipe to cut the ground; It is composed of, and the cutting part is fixedly coupled to the outer circumferential surface of the supporting steel pipe, and a discharge hole through which the injection material is discharged on the rear side of the cutting part rotation direction is characterized in that it includes a blade provided with three or more per cutting part.
이하, 첨부한 도면 및 바람직한 실시예에 따라 본 발명을 상세히 설명한다. Hereinafter, the present invention will be described in detail according to the accompanying drawings and preferred embodiments.
도 1은 본 발명 선단보강부가 구비된 복합 강관말뚝을 도시하는 단면도이다.1 is a cross-sectional view showing a composite steel pipe pile equipped with a tip reinforcement according to the present invention.
도 1 등에 도시된 바와 같이, 본 발명 선단보강부가 구비된 복합 강관말뚝은 지반(1)에 근입되는 강관말뚝 본체(2); 상기 강관말뚝 본체(2)의 하부 외주면에 형성되는 링 형상의 지지강판(3); 및 상기 강관말뚝 본체(2)와 지지강판(3) 하부의 지반(1)을 절삭 및 분쇄하여 주입재를 혼합함으로써 형성되는 원기둥 형상의 강화원지반(41)을 포함하는 선단보강부(4); 로 구성되는 것을 특징으로 한다.As shown in FIG. 1, etc., the composite steel pipe pile provided with the tip reinforcement of the present invention includes a steel pipe pile main body 2 inserted into the ground 1; A ring-shaped support steel plate 3 formed on the lower outer circumferential surface of the steel pipe pile body 2; And a tip reinforcement portion 4 including a cylindrical reinforced circular ground 41 formed by cutting and pulverizing the ground 1 under the steel pipe pile body 2 and the supporting steel plate 3 and mixing the injection material; It is characterized by consisting of.
본 발명은 헬릭스가 암반층인 지지지반(12)까지 근입되지 않으면서도 하부의 선단보강부(4)에 의해 기존 지지지반(12)에 지지되는 말뚝보다 큰 허용지지력을 얻을 수 있는 선단보강부가 구비된 복합 강관말뚝을 제공하기 위한 것이다. The present invention is provided with a tip reinforcement portion capable of obtaining a greater allowable bearing capacity than a pile supported on the existing support base 12 by the tip reinforcement portion 4 at the bottom without the helix being inserted to the support base 12, which is a rock layer. It is intended to provide a composite steel pipe pile.
본 발명 선단보강부가 구비된 복합 강관말뚝은 상부의 강관말뚝 본체(2)와 하부의 선단보강부(4)를 포함하여 구성된다. The composite steel pipe pile equipped with the tip reinforcement part of the present invention is composed of an upper steel pipe pile body 2 and a lower end reinforcement part 4.
상기 강관말뚝 본체(2)는 회전 압입에 의해 지반(1) 내부에 근입 가능하다.The steel pipe pile body 2 can be inserted into the ground 1 by rotary press-fitting.
상기 강관말뚝 본체(2)는 상부의 연약지반(11)을 관통하여 하부의 지지지반(12) 상부까지 근입되는 것이 바람직하나 경우에 따라서는 토사층까지 근입될 수도 있다.The steel pipe pile body 2 is preferably penetrated through the soft ground 11 at the top and inserted to the top of the supporting ground 12 at the bottom, but in some cases, it may be inserted even to the soil layer.
상기 지지지반(12)은 풍화암 이상의 암반층을 의미한다.The supporting ground 12 means a bedrock layer of weathered rock or higher.
상기 강관말뚝 본체(2)의 하부 외주면에는 링 형상의 지지강판(3)이 형성된다.A ring-shaped support steel plate 3 is formed on the lower outer circumferential surface of the steel pipe pile body 2.
상기 지지강판(3)은 헬릭스(helix) 형태로 형성 가능하다.The support steel plate 3 may be formed in a helix shape.
상기 선단보강부(4)는 강관말뚝 본체(2)와 지지강판(3)의 하부에 구비된다. The tip reinforcement part 4 is provided in the lower part of the steel pipe pile body 2 and the support steel plate 3.
상기 선단보강부(4)는 원기둥 형상의 강화원지반(41)을 포함하여 구성된다. The front end reinforcement part 4 is configured to include a circular reinforcement base 41 having a cylindrical shape.
상기 강화원지반(41)은 강관말뚝 본체(2)와 지지강판(3) 하부의 지반을 절삭 및 분쇄한 후 주입재를 주입하여 강화한 것으로, 연암 수준 이상의 지지력을 발휘할 수 있다. The reinforcement source ground 41 is reinforced by injecting an injection material after cutting and grinding the ground under the steel pipe pile body 2 and the supporting steel plate 3, and can exert a bearing capacity equal to or higher than the soft rock level.
상기 강화원지반(41)은 외경이 지지강판(3)의 외경 이상으로 형성되어, 지지강판(3)의 하면이 강화원지반(41)의 상부에 지지되어 선단지지력을 발휘한다.The reinforcing base 41 has an outer diameter larger than the outer diameter of the supporting steel plate 3, so that the lower surface of the supporting steel plate 3 is supported on the upper portion of the reinforcing base 41 to exert a tip bearing capacity.
여기에서 상기 지지강판(3)은 강화원지반(41)의 상부에 구비된다. 그러므로 상기 강화원지반(41)이 암반층인 지지지반(12) 내에 형성되는 경우, 말뚝에 압축력 작용 시 강화원지반(41)에 3축 압축력이 작용하여 강화원지반(41)의 강도가 크게 증가하고, 이에 따라 연직지지력이 향상된다.Here, the support steel plate 3 is provided on top of the reinforcement base ground 41. Therefore, when the reinforcement base 41 is formed in the support base 12, which is a bedrock layer, when a compressive force is applied to the pile, a triaxial compressive force acts on the reinforcement base 41, so that the strength of the reinforcement base 41 is greatly increased. As a result, the vertical bearing capacity is improved.
구체적으로 상부에서 연직 하중 작용 시 강관말뚝 본체(2)의 하중은 지지강판(3)을 통해 하부의 선단보강부(4)로 전달된다. 그리고 선단보강부(4)을 구성하는 원기둥 형상의 강화원지반(41) 외주면과 주변 지반 사이의 주면마찰력과 강화원지반(41) 하부의 지압에 의해 하중을 하부 지반(1)으로 원활하게 전달할 수 있다.Specifically, when a vertical load is applied from the top, the load of the steel pipe pile body 2 is transmitted to the front end reinforcement part 4 at the bottom through the support steel plate 3. In addition, the load can be smoothly transferred to the lower ground 1 by the circumferential friction between the outer circumferential surface of the cylindrical reinforcement base 41 constituting the tip reinforcement part 4 and the surrounding ground and the pressure of the lower part of the reinforcement base 41 .
상기 강화원지반(41)과 주변 지반 사이의 주면마찰력을 충분히 발휘하기 위해 강화원지반(41)의 높이는 지지강판(3) 외경의 2배 이상으로 구성하는 것이 바람직하다. In order to sufficiently demonstrate the surface friction force between the reinforcement base 41 and the surrounding ground, the height of the reinforcement base 41 is preferably configured to be at least twice the outer diameter of the supporting steel plate 3.
본 발명에 따르면 상기 강관말뚝 본체(2)의 하부에 강관말뚝 본체(2)보다 직경이 크고 풍화암 이상의 견고한 지지력을 발휘하는 선단보강부(4)가 구비되므로, 기존 말뚝보다 큰 허용 연직지지력을 얻을 수 있다. 따라서 마이크로파일 이상의 충분한 지지력 확보가 가능하다. According to the present invention, since the tip reinforcement part 4 having a larger diameter than the steel pipe pile body 2 and exhibiting a stronger bearing capacity than weathered rock is provided at the lower part of the steel pipe pile body 2, a greater allowable vertical bearing capacity than the existing pile can be obtained. can Therefore, it is possible to secure a sufficient bearing capacity higher than that of the micropile.
또한, 상기 강관말뚝 본체(2)의 하단에 직경이 크고 지지력이 큰 선단보강부(4)가 구비되므로, 선단보강부(4)의 상부에 1개의 헬릭스만 설치하여도 충분한 허용 연직지지력을 확보할 수 있다. 이에 말뚝 시공 시 관입 저항을 크게 줄일 수 있고, 헬릭스 부착 비용을 줄여 원가 절감이 가능하다. In addition, since the tip reinforcement part 4 having a large diameter and a large bearing capacity is provided at the lower end of the steel pipe pile body 2, even if only one helix is installed on the top of the tip reinforcement part 4, sufficient allowable vertical bearing capacity is secured. can do. As a result, penetration resistance can be greatly reduced during pile construction, and cost can be reduced by reducing helix attachment costs.
아울러 상기 강관말뚝 본체(2)의 하부에 강화된 선단보강부(4)를 형성하기 위해 하부 지지지반(12)을 절삭 및 분쇄하여 주재료로 사용하므로 경제적이고, 비배토 회전 압입 공법으로 시공되므로 현장이 깨끗하고 소음·진동이 거의 발생하지 않아 민원 발생 염려가 없다.In addition, in order to form the reinforced tip portion 4 at the bottom of the steel pipe pile body 2, the lower support ground 12 is cut and pulverized and used as the main material, so it is economical, and it is constructed by the non-casting rotary press-in method, so it is on-site It is clean and generates little noise and vibration, so there is no concern about civil complaints.
뿐만 아니라 상기 강관말뚝 본체(2)로 직경이 큰 강관을 사용할 수 있으므로, 연약층을 통과하는 경우에도 말뚝 좌굴 우려가 없다.In addition, since a steel pipe having a large diameter can be used as the steel pipe pile body 2, there is no risk of pile buckling even when passing through a soft layer.
도 2는 지지강관이 구비된 강관말뚝 본체를 도시하는 사시도이고, 도 3은 지지강관이 구비된 실시예를 도시하는 단면도이다.Figure 2 is a perspective view showing a steel pipe pile body provided with a support steel pipe, Figure 3 is a cross-sectional view showing an embodiment provided with a support steel pipe.
도 2, 도 3에 도시된 바와 같이, 상기 선단보강부(4)에는 상기 강관말뚝 본체(2)의 하단에 구비되는 것으로 분쇄된 지지지반(12) 측으로 주입재를 주입하는 토출공(421)이 형성된 지지강관(42)이 더 포함될 수 있다. As shown in FIGS. 2 and 3, the tip reinforcement part 4 has a discharge hole 421 provided at the lower end of the steel pipe pile body 2 and injecting the injection material into the pulverized support ground 12 side. The formed support steel pipe 42 may be further included.
상기 선단보강부(4)에서 강화원지반(41)의 중앙에는 지지강관(42)이 구비될 수 있다. A support steel pipe 42 may be provided at the center of the reinforcing original ground 41 in the tip reinforcement part 4.
상기 지지강관(42)은 외주면에 토출공(421)이 형성된다. The support steel pipe 42 is formed with a discharge hole 421 on the outer circumferential surface.
상기 지지강관(42)에 형성된 토출공(421)을 통하여 절삭 및 분쇄된 지지지반(12) 측으로 주입재를 주입하여 강화원지반(41)을 형성할 수 있다.The reinforcing original ground 41 may be formed by injecting the injection material into the cut and pulverized support ground 12 through the discharge hole 421 formed in the support steel pipe 42.
주변의 절삭 및 분쇄된 지반에 주입재가 균일하고 원활하게 주입되도록 상기 토출공(421)은 지지강관(42)의 외주면에 2개 이상이 형성되는 것이 바람직하다.It is preferable that two or more discharge holes 421 are formed on the outer circumferential surface of the support steel pipe 42 so that the injection material is uniformly and smoothly injected into the surrounding cut and crushed ground.
상기 지지강관(42)은 심재 역할을 하여 선단보강부(4)의 지지력을 향상시킬 수 있다. The support steel pipe 42 can improve the bearing capacity of the front end reinforcement part 4 by serving as a core material.
상기 지지강관(42)은 선단이 하부 지반(1)에 직접 지지되어, 지지강관(42)의 선단지지력에 의해 하중을 지반(1)으로 원활하게 전달할 수 있다.The front end of the support steel pipe 42 is directly supported on the lower ground 1, so that the load can be smoothly transferred to the ground 1 by the end bearing capacity of the support steel pipe 42.
상기 선단보강부(4)가 풍화암 등의 지지지반(12)에 형성되는 경우, 지지지반(12) 관입 시 말뚝의 압입 저항이 크다. 그러므로 관입 저항을 줄이기 위해 상기 지지강관(42)은 강관말뚝 본체(2)보다 작은 직경으로 구성하는 것이 바람직하다.When the front end reinforcement part 4 is formed in the support ground 12 such as weathered rock, the resistance of the pile when penetrating the support ground 12 is high. Therefore, in order to reduce penetration resistance, the support steel pipe 42 is preferably configured to have a smaller diameter than the steel pipe pile body 2.
특히, 상기 지지강관(42)은 강화원지반(41)과 일체화되어 상부 연직하중을 지지하는 역할만 하면 충분하다. 따라서 관입 저항을 최소화하면서도 지지 암반 관입에 문제가 없고, 심재 역할을 충분히 수행하도록 지지강관(42)의 직경은 강관말뚝 본체(2) 직경의 0.5~1.0배 범위의 것을 사용함이 바람직하다. In particular, the support steel pipe 42 is sufficient as long as it is integrated with the reinforcement base 41 to support the upper vertical load. Therefore, it is preferable to use the diameter of the support steel pipe 42 in the range of 0.5 to 1.0 times the diameter of the steel pipe pile body 2 so that there is no problem with penetration of the support rock while minimizing the penetration resistance, and sufficiently serves as a core material.
상기 지지강관(42)은 지반 관입이 용이하도록 외주면을 나사형으로 형성할 수도 있다.The supporting steel pipe 42 may have an outer circumferential surface formed in a screw shape to facilitate penetration into the ground.
상기 지지강관(42)의 하부 외주면에는 지반(1)을 절삭하는 절삭부(43)가 돌출 형성될 수 있다. A cutting part 43 for cutting the ground 1 may be protruded from the lower outer circumferential surface of the support steel pipe 42 .
상기 강관말뚝 본체(2)의 하부에 형성되는 강화원지반(41)은 강관말뚝 본체(2)의 시공 전 지반(1)을 미리 굴착하여 강관말뚝 본체(2)가 시공될 위치의 하부 지반(1)을 절삭 및 분쇄하고, 주입재를 주입하여 먼저 형성할 수 있다. 이후, 상기 강관말뚝 본체(2)를 근입하여 강화원지반(41) 상부에 지지시킬 수 있다.The reinforcement source ground 41 formed at the bottom of the steel pipe pile body 2 is the lower ground 1 at the position where the steel pipe pile body 2 is to be constructed by pre-excavating the ground 1 before construction of the steel pipe pile body 2 ), and may be formed first by injecting an injectable material. Thereafter, the steel pipe pile body 2 can be inserted and supported on the upper part of the reinforcement source ground 41.
그러나 이러한 과정은 추가 장비가 투입되고, 공기가 많이 소요된다.However, this process requires additional equipment and takes a lot of time.
따라서 상기 강관말뚝 본체(2)의 하단에 구비되는 지지강관(42)을 이용하여 강관말뚝 본체(2) 시공 시 하부 선단보강부(4)를 동시에 시공하는 방법을 고려할 수 있다. Therefore, when constructing the steel pipe pile body 2 using the support steel pipe 42 provided at the lower end of the steel pipe pile body 2, it is possible to consider a method of simultaneously constructing the lower tip reinforcement part 4.
이를 위해 상기 지지강관(42)의 외주면에 절삭부(43)를 돌출 형성할 수 있다.To this end, a cutting portion 43 may be protruded from the outer circumferential surface of the support steel pipe 42 .
이에 따라 상기 강관말뚝 본체(2)의 회전 압입 시, 지지강관(42)이 동시에 회전하면서 절삭부(43)가 지지강관(42) 주변의 지반(1)을 절삭 및 분쇄할 수 있다.Accordingly, when the steel pipe pile body 2 is rotated and press-fitted, the cutting part 43 can cut and crush the ground 1 around the support steel pipe 42 while the support steel pipe 42 rotates at the same time.
주변 지반을 절삭 및 분쇄한 후 지지강관(42)의 외주면에 구비된 토출공(421)으로 주입재를 주입하여 강화원지반(41)을 형성할 수 있다. After cutting and pulverizing the surrounding ground, the reinforcing base ground 41 may be formed by injecting the injection material into the discharge hole 421 provided on the outer circumferential surface of the supporting steel pipe 42.
구체적으로 풍화암층에 강화원지반(41)을 형성할 경우, 절삭부(43)와 지지강관(42)은 풍화암을 절삭하면서 일정 깊이로 회전 관입된다. 이후, 지지강관(42)을 정방향 및 역방향으로 회전하여 절삭된 지반을 분쇄한다. 그리고 절삭 및 분쇄된 원지반 풍화암의 미세 공극에 주입재를 주입하여 원지반 풍화암보다 크게 강화된 말뚝 지지력을 갖는 강화원지반(41)을 형성할 수 있다. Specifically, when the reinforced base 41 is formed in the weathered rock layer, the cutting part 43 and the supporting steel pipe 42 are rotated and penetrated at a certain depth while cutting the weathered rock. Thereafter, the cut ground is pulverized by rotating the support steel pipe 42 in forward and reverse directions. In addition, by injecting the injection material into the fine pores of the raw weathered rock that has been cut and pulverized, the reinforced raw ground 41 having a significantly enhanced pile bearing capacity than that of the raw weathered rock can be formed.
상기 절삭부(43)는 시공될 강화원지반(41)의 외경과 대응되는 크기를 갖도록 형성할 수 있다. The cutting portion 43 may be formed to have a size corresponding to the outer diameter of the base ground 41 to be constructed.
상기 절삭부(43)는 판형, 변단면형, 봉형 등 다양한 형상으로 형성 가능하다. 이때, 상기 절삭부(43)는 지지강판(3)과 같은 회전 관입력을 얻도록 일정한 관입각을 갖도록 구성하는 것이 바람직하다.The cutting part 43 can be formed in various shapes such as a plate shape, a tapered cross-section shape, and a rod shape. At this time, the cutting portion 43 is preferably configured to have a constant penetration angle to obtain the same rotational penetration force as the support steel plate 3.
상기 절삭부(43)의 회전 반경은 지지강판(3) 반경의 1~2배인 것이 바람직하다.The radius of rotation of the cutting portion 43 is preferably 1 to 2 times the radius of the supporting steel plate 3.
풍화암을 절삭하여 형성된 강화원지반(41)이 연암 정도의 지지 성능을 갖는 경우, 강화원지반(41)의 직경은 지지강판(3)의 직경 이상만 되면 지지강판(3)에 전달되는 상부 하중을 충분히 지지할 수 있다.When the reinforced base 41 formed by cutting weathered rock has support performance equivalent to that of soft rock, the diameter of the reinforced base 41 is equal to or greater than the diameter of the supporting steel plate 3 to sufficiently support the upper load transmitted to the supporting steel plate 3. can support
한편, 단단한 토사층을 절삭하여 강화원지반(41)이 풍화암 수준의 지지 성능을 갖는 경우, 강화원지반(41)의 직경은 지지강판(3)의 직경보다 커야 상부 하중을 충분히 지지할 수 있다. 그러나 강화원지반(41)의 직경이 지나치게 클 경우, 시공 시간이 많이 소요되고 주입재 소모량이 지나치게 증가하여 비경제적이다. 그러므로 강화원지반(41)을 형성하는 절삭부(43)의 회전 반경은 지지강판(3) 반경의 3배 이하인 것이 바람직하다.On the other hand, when the hard soil layer is cut and the reinforcement base 41 has the same level of support performance as weathered rock, the diameter of the reinforcement base 41 must be larger than the diameter of the support steel plate 3 to sufficiently support the upper load. However, when the diameter of the reinforcement base 41 is too large, it takes a lot of construction time and excessively increases the consumption of the injection material, which is uneconomical. Therefore, it is preferable that the radius of rotation of the cutting portion 43 forming the reinforcing base ground 41 is 3 times or less than the radius of the supporting steel plate 3.
상기 지지강관(42)의 선단에는 지반 근입을 용이하게 하도록 원추형의 첨단부(422)가 구비될 수 있다. A conical tip 422 may be provided at the front end of the support steel pipe 42 to facilitate ground penetration.
상기 절삭부(43)는 지지강관(42)의 외주면에 일단이 고정 결합되는 블레이드(431)와 상기 블레이드(431)의 상면 또는 하면에 돌출 형성되는 분쇄팁(432)으로 구성될 수 있다.The cutting part 43 may be composed of a blade 431 having one end fixedly coupled to the outer circumferential surface of the support steel pipe 42 and a crushing tip 432 protruding from the upper or lower surface of the blade 431.
상기 절삭부(43)는 강관말뚝 본체(2)의 하부 지반을 절삭할 뿐 아니라 절삭된 토사 또는 암반을 분쇄한다.The cutting part 43 not only cuts the lower ground of the steel pipe pile body 2, but also crushes the cut soil or bedrock.
이를 위해 상기 절삭부(43)는 블레이드(431)와 분쇄팁(432)으로 구성할 수 있다.To this end, the cutting part 43 may be composed of a blade 431 and a crushing tip 432.
상기 블레이드(431)는 지지강관(42)의 외측으로 돌출 형성된 부분으로, 지지강관(42)의 회전에 의해 하부 지반(1)을 절삭한다.The blade 431 is a part protruding outward of the support steel pipe 42, and cuts the lower ground 1 by the rotation of the support steel pipe 42.
상기 분쇄팁(432)은 블레이드(431)의 상면 또는 하면에 돌출 형성되는 것으로, 절삭된 지반(1)을 균질하게 분쇄한다.The crushing tip 432 protrudes from the upper or lower surface of the blade 431, and homogeneously crushes the cut ground 1.
도 4는 절삭부에 토출공이 구비된 실시예를 도시하는 사시도이다.4 is a perspective view illustrating an embodiment in which a discharge hole is provided in a cutting part.
도 4에 도시된 바와 같이, 상기 블레이드(431)에는 절삭부 회전 방향 배면 측에 주입재가 토출되는 토출공(433)이 구비될 수 있다.As shown in FIG. 4 , the blade 431 may be provided with a discharge hole 433 through which the injection material is discharged on the rear side of the cutting unit rotation direction.
상기 절상부(43)의 블레이드(431)에서 강관말뚝 정회전시 절삭 압력을 받는 면의 배면 측에 토출공(433)이 구비되면 회전에 의해 강관말뚝이 하향 관입되면서 블레이드(431)의 토출공(433)에서 절삭 분쇄된 지반에 주입재가 골고루 주입되므로 선단보강부(4)의 품질을 일정 이상으로 균일하게 확보할 수 있다.When the discharge hole 433 is provided on the back side of the surface that receives the cutting pressure when the steel pipe pile is rotated forward in the blade 431 of the cut portion 43, the steel pipe pile penetrates downward by rotation, and the discharge hole 433 of the blade 431 Since the injection material is evenly injected into the ground cut and pulverized in ), it is possible to uniformly secure the quality of the tip reinforcement part 4 above a certain level.
도 5는 이동식 지지강관이 구비된 실시예를 도시하는 도면이고, 도 6은 절첩식 절삭부가 구비된 실시예를 도시하는 도면이다.5 is a view showing an embodiment provided with a movable support steel pipe, and FIG. 6 is a view showing an embodiment provided with a collapsible cutting part.
도 5, 도 6에 도시된 바와 같이, 상기 지지강관(42)은 강관말뚝 본체(2)의 하단 내부에서 상하로 이동 가능하게 구비될 수 있다. As shown in FIGS. 5 and 6, the support steel pipe 42 may be provided to be movable up and down inside the lower end of the steel pipe pile body 2.
상기 지지강관(42)은 강관말뚝 본체(2)의 하단에 일체로 형성될 수 있다. 그러나 이 경우 강관말뚝 본체(2)가 상부 연약지반(11)에 근입되고, 지지강관(42)이 하부 지지지반(12)에 근입되면, 말뚝 회전 압입 시 관입 저항이 클 수 있다.The support steel pipe 42 may be integrally formed at the lower end of the steel pipe pile body 2. However, in this case, when the steel pipe pile body 2 is inserted into the upper soft ground 11 and the supporting steel pipe 42 is inserted into the lower supporting ground 12, penetration resistance may be large during pile rotation press-fitting.
이에 상기 지지강관(42)을 강관말뚝 본체(2)의 하단 내부에 수납할 수 있다. Accordingly, the support steel pipe 42 can be accommodated inside the lower end of the steel pipe pile body 2.
따라서 도 5의 (a)와 같이 지지강관(42)이 외부로 돌출되지 않은 상태로 강관말뚝 본체(2)를 먼저 시공 완료한 후, 도 5의 (b)와 같이 지지강관(42)을 회전 하강시켜 강관말뚝 본체(2) 하부로 돌출시키면서 하부의 강화원지반(41)을 형성할 수 있다.Therefore, after completing the construction of the steel pipe pile body 2 first in a state in which the support steel pipe 42 does not protrude to the outside as shown in (a) of FIG. 5, the support steel pipe 42 is rotated as shown in (b) of FIG. It is possible to form the lower reinforcement base 41 while protruding to the lower part of the steel pipe pile body 2 by descending.
상기 지지강관(42)의 외주면에 절삭부(43)가 형성된 경우, 상기 절삭부(43)는 지지강관(42)의 외주면에 회전 가능하게 결합될 수 있다. When the cutting part 43 is formed on the outer circumferential surface of the supporting steel pipe 42, the cutting part 43 may be rotatably coupled to the outer circumferential surface of the supporting steel pipe 42.
이에 도 6에서와 같이, 상기 절삭부(43)는 하부로 회전되어 수직인 상태에서 강관말뚝 본체(2)의 내부에 수납될 수 있다.Accordingly, as shown in FIG. 6, the cutting part 43 can be rotated downward and accommodated inside the steel pipe pile body 2 in a vertical state.
상기 지지강관(42)의 하강 시, 절삭부(43)는 하부 지반(1)에 지지되면서 자연스럽게 수평 방향으로 회전되게 구성할 수 있다. 이 경우 상기 절삭부(43)는 수평 상태에서 더는 회전하지 않도록 회전각을 제한할 수 있다. When the support steel pipe 42 is lowered, the cutting part 43 may be configured to be naturally rotated in the horizontal direction while being supported on the lower ground 1. In this case, the rotation angle of the cutting part 43 may be limited such that it no longer rotates in a horizontal state.
상기 지지강관(42)은 외주면에 나사산이 형성되고, 강관말뚝 본체(2)의 하부 내주면에는 암나사산이 형성될 수 있다. 이에 상기 지지강관(42)은 강관말뚝 본체(2)의 하단에 나사 결합할 수 있다.The support steel pipe 42 has a screw thread formed on the outer circumferential surface, and a female screw thread may be formed on the lower inner circumferential surface of the steel pipe pile body 2. Accordingly, the support steel pipe 42 may be screwed to the lower end of the steel pipe pile body 2.
이에 따라 상기 강관말뚝 본체(2) 내부로 회전장비(5)를 삽입하여 지지강관(42)의 상단에 장착한 후 회전장비(5)를 회전시키면, 지지강관(42)만 회전하면서 지지강관(42)이 강관말뚝 본체(2)로부터 하부로 돌출되어 하부 지반(1)을 절삭 및 분쇄할 수 있다. Accordingly, when the rotation equipment 5 is inserted into the steel pipe pile body 2 and mounted on the upper end of the support steel pipe 42, and then the rotation equipment 5 is rotated, only the support steel pipe 42 is rotated while the support steel pipe ( 42) protrudes downward from the steel pipe pile body 2 to cut and crush the lower ground 1.
상기 강화원지반(41)을 형성하는 주입재는 주제에 경화제가 혼합되어 팽창되는 팽창재일 수 있다. The injection material forming the reinforcing base ground 41 may be an expansion material in which a hardener is mixed with a main material and expanded.
상기 주입재로 시멘트 페이스트나 기타 고화재를 사용하여 절삭 및 분쇄된 지반과 혼합하여 강화원지반(41)을 형성할 수 있다. 이 경우 주입재를 주변 지반으로 주입하기 위해 일정한 크기의 주입압을 가하여야 하므로, 별도의 주입장비가 필요하다.The reinforcing base 41 may be formed by using cement paste or other solidifying materials as the injection material and mixing with the cut and pulverized ground. In this case, since a certain amount of injection pressure must be applied to inject the injection material into the surrounding ground, separate injection equipment is required.
이에 별도의 주입장비 없이도 주입재가 지지강관(42)에서 토출되어 절삭 및 분쇄된 지반에 주입되도록 주입재로 팽창재를 사용할 수 있다.Therefore, the expansion material can be used as an injection material so that the injection material is discharged from the support steel pipe 42 and injected into the ground that has been cut and pulverized without a separate injection equipment.
팽창재인 주입재는 자체 팽창 압력에 의해 토출공(421)을 통해 지지강관(42)에서 토출되고, 절삭 및 분쇄된 지반의 공극을 채워 강화원지반(41)을 형성한다.The injection material, which is an expansion material, is discharged from the support steel pipe 42 through the discharge hole 421 by self-expanding pressure, and fills the voids of the ground that has been cut and pulverized to form the ground reinforcement 41.
상기 팽창재는 고결 시간이 매우 빨라 시공 후 보강 여부를 바로 확인 가능하다.The expansion material has a very fast solidification time, so it is possible to immediately check whether or not it is reinforced after construction.
상기 주입재는 우레탄계 팽창재를 사용할 수 있다. 우레탄계 팽창재는 배합 성분과 배합비 및 반응 시 온도 등에 따라 공기 중에서 8~30배 정도로 부피가 팽창된다. 우레탄계 팽창재를 연약지반에 주입하면, 팽창재가 연약지반 내의 물과 공기를 밀어내고 공극을 채우면서 매우 큰 강성을 갖는 지반으로 변화시킨다.The injection material may use a urethane-based expandable material. The urethane-based expandable material expands in volume by about 8 to 30 times in air depending on the ingredients, the mixing ratio, and the reaction temperature. When the urethane-based expansive material is injected into the soft ground, the expansive material pushes out water and air in the soft ground and fills the voids, transforming the soft ground into a very strong ground.
본 발명 선단보강부가 구비된 복합 강관말뚝은 상기 주입재의 주입 여부를 확인하는 구성을 더 포함할 수 있다. The composite steel pipe pile provided with the tip reinforcement of the present invention may further include a configuration for checking whether the injection material is injected.
일실시예로 상기 강관말뚝 본체(2)의 지지강판(3) 하부 또는 지지강관(42)에는 주입재의 주입 상태를 확인하기 위한 확인홀(21)이 형성될 수 있다(도 2).In one embodiment, a confirmation hole 21 for checking the injection state of the injection material may be formed in the lower portion of the support steel plate 3 or the support steel pipe 42 of the steel pipe pile body 2 (FIG. 2).
상기 확인홀(21)은 토출공(421)보다 상부에 위치될 수 있다. The confirmation hole 21 may be located above the discharge hole 421 .
따라서 강화원지반(41) 형성을 위해 지지강관(42) 주변 지반으로 주입된 주입재가 공극을 모두 채운 후 확인홀(21)을 통해 역유입되면, 상부에서 강관말뚝 본체(2)를 통해 육안으로 역유입된 주입재을 확인하여 주입재의 주입 상태를 확인할 수 있다. Therefore, when the injection material injected into the ground around the support steel pipe 42 to form the reinforcing source ground 41 fills all the voids and flows back through the confirmation hole 21, it is reversed visually through the steel pipe pile body 2 from the top. It is possible to check the injection state of the injection material by checking the injected injection material.
또는, 상기 강관말뚝 본체(2)의 내부를 촬영하거나 감지센서를 부착하여 주입재의 주입 여부를 기록으로 남길 수 있다.Alternatively, the inside of the steel pipe pile body 2 may be photographed or a detection sensor may be attached to record whether or not the injection material is injected.
도 7 및 도 8은 수용부가 구비된 실시예를 도시하는 단면도이다.7 and 8 are cross-sectional views showing an embodiment provided with an accommodating part.
도 7, 도 8에 도시된 바와 같이, 상기 지지강관(42)의 내부에는 상기 주제와 경화제 중 어느 하나가 수용되는 상부의 제1수용부(44)와 상기 주제와 경화제 중 나머지 하나가 수용되는 하부의 제2수용부(45)가 구비되고, 상기 제2수용부(45)는 상기 지지강관(42)의 토출공(421)과 연통되어 주제와 경화제의 혼합 시 주입재의 팽창압에 의해 주입재가 토출공(421)으로 토출되게 구성될 수 있다. As shown in FIGS. 7 and 8, the inside of the support steel pipe 42 includes an upper first receiving portion 44 in which one of the main agent and the curing agent is accommodated, and the other of the main agent and the curing agent is accommodated. A second accommodating part 45 is provided at the lower part, and the second accommodating part 45 communicates with the discharge hole 421 of the support steel pipe 42, so that when the main agent and the curing agent are mixed, the injection material is caused by the expansion pressure of the injection material. may be configured to be discharged through the discharge hole 421 .
강관말뚝 근입 완료 후 목표 지점에서 주입재가 주변 지반(1)으로 주입되도록 상기 주입재는 주제와 경화제의 혼합에 의해 팽창이 이루어지는 2액형으로 구성할 수 있다.After completion of the steel pipe pile insertion, the injection material may be configured as a two-component type in which expansion is performed by mixing the main agent and the hardener so that the injection material is injected into the surrounding ground (1) at the target point.
상기 지지강관(42) 및 절삭부(43)에 의해 지지강관(42) 주변 지반을 절삭 및 분쇄한 다음 제1수용부(44)와 제2수용부(45)에 분리 수용된 주제와 경화제를 혼합하면, 주입재가 팽창 반응에 의해 토출공(42)을 통하여 절삭 및 분쇄된 주변 지반으로 주입된다. 이 경우 수 분 내에 매우 단단한 풍화암 내지 연암의 물성에 해당하는 양질의 말뚝 지지층을 형성할 수 있다.The ground around the support steel pipe 42 is cut and pulverized by the support steel pipe 42 and the cutting part 43, and then the main material and the hardener separately accommodated in the first accommodating part 44 and the second accommodating part 45 are mixed. When the injection material is injected through the discharge hole 42 by the expansion reaction into the cut and crushed surrounding ground. In this case, a high-quality pile support layer corresponding to the physical properties of very hard weathered rock or soft rock can be formed within a few minutes.
이때, 주입재를 구성하는 주제와 경화제 중 비중이 높은 것을 상부의 제1수용부(44)에 주입하고, 비중이 낮은 것을 하부의 제2수용부(45)에 주입한다.At this time, among the main material and the curing agent constituting the injection material, the high specific gravity is injected into the upper first accommodating part 44, and the low specific gravity is injected into the lower secondary accommodating part 45.
상기 제2수용부(45)는 지지강관(42)의 토출공(421)과 연통된다. 이에 제1수용부(44)의 주제 또는 경화제가 제2수용부(45) 측으로 유입되면, 주입재의 팽창 반응이 시작되어 자체 팽창압에 의해 토출공(421)을 통해 주입재가 토출되어 지반(1) 내에 주입된다.The second accommodating part 45 communicates with the discharge hole 421 of the support steel pipe 42. Accordingly, when the main material or curing agent of the first accommodating part 44 flows into the second accommodating part 45, the expansion reaction of the injection material starts, and the injection material is discharged through the discharge hole 421 by the self-expanding pressure so that the ground 1 ) is injected into
상기 토출공(421)은 폐쇄된 상태를 유지하다가 주입재의 토출 시 개방된다.The discharge hole 421 remains closed and opens when the injection material is discharged.
상기 제1수용부(44)와 제2수용부(45)는 분리막(46)에 의해 상호 분리되어, 분리막(46)의 파열에 의해 주제와 경화제가 혼합될 수 있다. The first accommodating part 44 and the second accommodating part 45 are separated from each other by the separator 46, and the main agent and the curing agent may be mixed by the rupture of the separator 46.
별도의 외부 주입장비 없이 주제와 경화제가 지지강관(42) 내부에서 자체 혼합되어 주입 가능하도록 제1수용부(44)와 제2수용부(45)를 분리막(46)으로 상호 분리하여 구성할 수 있다. The first receiving part 44 and the second receiving part 45 can be separated from each other by a separator 46 so that the main material and the hardener can be self-mixed and injected inside the support steel pipe 42 without separate external injection equipment. there is.
상기 분리막(46)은 강관말뚝의 압입 완료 후 작업자가 간단하게 파열시킬 수 있는 재료로 형성한다.The separation membrane 46 is formed of a material that can be easily ruptured by a worker after completing the press-fitting of the steel pipe pile.
이에 작업자가 분리막(46)을 파열시키면, 상부의 주제 또는 경화제가 하부로 유입되어 서로 혼합되어 팽창하며, 토출공(421)을 통해 주변 지반(1)으로 주입된다.Accordingly, when the operator ruptures the separator 46, the upper main agent or curing agent flows into the lower portion, is mixed with each other, expands, and is injected into the surrounding ground 1 through the discharge hole 421.
상기 제1수용부(44)의 상부에는 상부 타격에 의해 하부로 이동하여 상기 분리막(46)을 파열시키는 분리막 파열봉(47)이 상하로 슬라이딩 가능하게 구비될 수 있다. A separation membrane rupturing rod 47 that moves downward by an upper blow and ruptures the separation membrane 46 may be provided above the first accommodating part 44 so as to be slidable up and down.
상기 지지강관(42)은 말뚝 선단부에 위치하므로, 작업자가 일반 공구에 의해 분리막(46)을 직접 파열하기 어려울 수 있다.Since the support steel pipe 42 is located at the tip of the pile, it may be difficult for a worker to directly rupture the separator 46 with a general tool.
따라서 상기 제1수용부(44)의 상부에 상하로 슬라이딩 이동 가능한 분리막 파열봉(47)을 구비할 수 있다.Accordingly, a separator rupture rod 47 capable of sliding vertically may be provided on the upper portion of the first accommodating part 44 .
상기 분리막 파열봉(47)은 제1수용부(44)의 상부에 억지 끼움 등의 방식으로 결합할 수 있다. The membrane rupturing rod 47 may be coupled to the upper portion of the first accommodating part 44 in a manner such as an interference fit.
중량물인 낙하추(6)를 낙하시키는 등의 방법으로 상부에서 분리막 파열봉(47)을 타격하면, 분리막 파열봉(47)이 하부로 슬라이딩 이동하면서 제1수용부(44)와 제2수용부(45)를 구분하는 분리막(46)을 간단하게 파열할 수 있다.When the membrane rupturing rod 47 is hit from the top by a method such as dropping a heavy weight 6, the membrane rupturing rod 47 slides downward to the first accommodating part 44 and the second accommodating part. The separation membrane 46 separating the 45 can be easily ruptured.
상기 분리막 파열봉(47)은 분리막(46)을 쉽게 파열하도록 하단을 뾰족하게 형성할 수 있다.The separator rupture bar 47 may have a sharp lower end to easily rupture the separator 46 .
상기 지지강관(42)의 토출공(421)은 강관말뚝 압입 시에는 폐쇄되었다가 주입재 주입시에만 개방되어야 한다.The discharge hole 421 of the support steel pipe 42 should be closed when the steel pipe pile is pressed in and open only when the injection material is injected.
따라서 평소에는 토출공(421)을 폐쇄하다가 분리막 파열봉(47)에 의해 분리막(46) 파열 시 자동으로 토출공(421)을 개방할 수 있는 토출공 자동개폐구(48)를 제2수용부(45)의 내부에 구비할 수 있다.Therefore, the discharge hole 421 is normally closed, but when the separation membrane 46 is ruptured by the separation membrane rupture rod 47, the discharge hole automatic opening/closing port 48 capable of automatically opening the discharge hole 421 is provided in the second accommodating part ( 45) can be provided inside.
상기 토출공 자동개폐구(48)는 개폐마개(481), 가이드봉(482) 및 연결와이어(483)로 구성 가능하다. The discharge hole automatic opening/closing hole 48 may be composed of an opening/closing stopper 481, a guide rod 482, and a connecting wire 483.
상기 개폐마개(481)는 토출공(421)에 삽입되어 토출공(421)을 폐쇄한다. The opening and closing stopper 481 is inserted into the discharge hole 421 to close the discharge hole 421 .
상기 개폐마개(481)는 각 토출공(421)에 삽입되도록 복수 개 구비될 수 있다. 상기 개폐마개(481)는 토출공(421)을 폐쇄함으로써, 제2수용부(45)에 수용된 주제 또는 경화제가 말뚝 시공 중 외부로 유출되지 않도록 함과 동시에 외부의 물질이 내부로 유입되는 것을 차단한다(도 7). The opening and closing stopper 481 may be provided in plurality to be inserted into each discharge hole 421 . The opening and closing stopper 481 closes the discharge hole 421 to prevent the main material or hardener accommodated in the second accommodating part 45 from leaking out during pile construction and at the same time to block the inflow of external substances into the inside. (FIG. 7).
상기 가이드봉(482)은 분리막 파열봉(47)의 하부 위치에 구비되어, 분리막 파열봉(47)의 하강 시 분리막 파열봉(47)의 가압에 의해 하부로 하강한다. The guide rod 482 is provided at a lower position of the membrane rupturing rod 47 and descends downward by pressing the membrane rupturing rod 47 when the membrane rupturing rod 47 descends.
상기 가이드봉(482)은 제2수용부(45)의 중앙에서 분리막 파열봉(47)의 직하부 위치에 구비된다. The guide rod 482 is provided at a position directly below the membrane rupture rod 47 at the center of the second accommodating part 45 .
상기 가이드봉(482)은 토출공(421)에 끼움 결합된 개폐마개(481)에 연결와이어(483)로 연결되며, 제2수용부(45)의 중앙에서 위치가 고정된다. The guide rod 482 is connected to the opening/closing stopper 481 fitted into the discharge hole 421 by a connecting wire 483, and is fixed in a position at the center of the second accommodating part 45.
낙하추(6)가 낙하하여 분리막 파열봉(47)이 하강하면 분리막(46)이 파열되고, 분리막 파열봉(47)이 제2수용부(45) 내부로 더욱 하강하여 가이드봉(482)의 상단을 타격한다.When the falling weight 6 falls and the membrane rupture rod 47 descends, the separation membrane 46 is ruptured, and the membrane rupture rod 47 further descends into the second accommodating part 45 to break the guide rod 482. hit the top
이에 따라 상기 가이드봉(482)은 하부로 이동하고, 가이드봉(482)과 개폐마개(481)를 연결하는 연결와이어(483)가 하부로 당겨지면서 개폐마개(481)가 토출공(421)에서 탈락한다(도 8).Accordingly, the guide rod 482 moves downward, and the connecting wire 483 connecting the guide rod 482 and the opening and closing stopper 481 is pulled downward, and the opening and closing stopper 481 moves through the discharge hole 421. drop out (FIG. 8).
따라서 주제와 경화제의 혼합과 동시에 토출공(421)이 개방되어 주입재가 지지강관(42) 외부로 토출된다.Therefore, the injection hole 421 is opened at the same time as the mixture of the main agent and the curing agent, and the injection material is discharged to the outside of the support steel pipe 42.
상기 가이드봉(482)의 하강 시 주제와 경화제의 신속하고 효과적인 혼합을 위해 가이드봉(482)의 외주면에 혼합블레이드(미도시)가 형성되거나 제2수용부(45)의 내부에 혼합볼(49) 등이 구비될 수 있다.When the guide rod 482 descends, a mixing blade (not shown) is formed on the outer circumferential surface of the guide rod 482 for rapid and effective mixing of the main agent and the curing agent, or a mixing ball 49 inside the second accommodating part 45. ) and the like may be provided.
도 9는 슬라임 유입홀이 구비된 실시예를 도시하는 단면도이다.9 is a cross-sectional view showing an embodiment provided with a slime inlet hole.
도 9에 도시된 바와 같이, 상기 수용부(44, 45), 즉 제1수용부(45)와 제2수용부(45) 상부의 지지강관(42) 외주면 또는 강관말뚝 본체(2)의 하단 외주면에는 슬라임 유입홀(22)이 구비될 수 있다. As shown in FIG. 9, the outer circumferential surface of the supporting steel pipe 42 above the receiving portions 44 and 45, that is, the first receiving portion 45 and the second receiving portion 45, or the lower end of the steel pipe pile body 2 A slime inlet hole 22 may be provided on the outer circumferential surface.
상기 선단보강부(4)가 형성되는 지지지반(12)은 매우 단단한 지층으로 절삭 시 부피가 증가할 수밖에 없다. 그리고 상부의 지지강판(3)에 의해 절삭 슬라임의 이동이 제한되어 절삭 작업이 용이하지 않고, 시간이 많이 소요될 수 있다. The support ground 12 on which the tip reinforcement part 4 is formed is a very hard stratum, and the volume inevitably increases during cutting. In addition, the movement of the cutting slime is restricted by the support steel plate 3 on the upper side, so the cutting operation is not easy and may take a lot of time.
따라서 상기 지지강관(42)이나 강관말뚝 본체(2)의 하단 외주면에 슬라임 유입홀(22)을 형성하여, 지지강관(42) 주변 지반 절삭 시 발생하는 슬라임을 말뚝 내부로 이동시킬 수 있다.Therefore, by forming a slime inlet hole 22 on the outer circumferential surface of the lower end of the support steel pipe 42 or the steel pipe pile body 2, the slime generated when cutting the ground around the support steel pipe 42 can be moved into the pile.
절삭 슬라임의 일부만이라도 말뚝 내부로 유입되면, 절삭 작업을 보다 용이하게 진행할 수 있다.If even a portion of the cutting slime flows into the pile, the cutting operation can be performed more easily.
아울러 유입된 절삭 슬라임이 상부로 원활하게 이동하도록 지지강관(42) 또는 강관말뚝 본체(2) 내부에 미리 물이나 마찰 감소용 유체 등을 채울 수도 있다.In addition, water or a fluid for reducing friction may be filled in advance in the support steel pipe 42 or the steel pipe pile body 2 so that the introduced cutting slime moves smoothly to the top.
이때, 물이나 마찰 감소용 유체는 제1수용부(44)와 제2수용부(45)의 상부에 구비될 수 있다.At this time, water or friction reducing fluid may be provided on the upper portions of the first accommodating part 44 and the second accommodating part 45 .
도 10은 본 발명 선단보강부가 구비된 복합 강관말뚝의 시공 방법을 도시하는 도면이다.10 is a view showing a construction method of a composite steel pipe pile equipped with a tip reinforcement of the present invention.
본 발명 선단보강부가 구비된 복합 강관말뚝의 시공 방법은 도 1 내지 도 9를 참고하여 전술한 본 발명 선단보강부가 구비된 복합 강관말뚝을 시공하는 방법에 대한 것이다.The construction method of the composite steel pipe pile equipped with the tip reinforcement of the present invention relates to the method of constructing the composite steel pipe pile equipped with the tip reinforcement of the present invention described above with reference to FIGS. 1 to 9.
본 발명에서는 먼저 (a) 강관말뚝 본체(2)를 회전 압입하여 지중의 지지지반(12)까지 도달시키는 한편, 상기 강관말뚝 본체(2) 하부의 지지지반(12)을 상기 절삭부(43)에 의해 상기 강관말뚝 본체(2)보다 큰 지름으로 절삭 및 분쇄한다(도 10의 (a)).In the present invention, first, (a) press-in the steel pipe pile body 2 to reach the support base 12 in the ground, while the support base 12 under the steel pipe pile body 2 is cut through the cutting portion 43 By cutting and grinding to a larger diameter than the steel pipe pile body (2) (Fig. 10 (a)).
상기 (a) 단계에서는 하단 외주면에 지지강판(3)이 구비된 강관말뚝 본체(2)를 회전 압입하여 지중의 지지지반(12)까지 도달시킨다. 이때, 직경이 큰 강관말뚝 본체(2)와 지지강판(3)은 관입 저항이 크므로, 지지지반(12) 상단 부근까지만 근입한다.In the step (a), the steel pipe pile body 2 equipped with the support steel plate 3 on the outer circumferential surface of the lower end is press-fitted by rotation to reach the support base 12 in the ground. At this time, since the large-diameter steel pipe pile body 2 and the support steel plate 3 have high penetration resistance, they are inserted only to the vicinity of the upper end of the support ground 12.
그리고 상기 강관말뚝 본체(2) 하부의 지반을 원기둥 형상으로 절삭 및 분쇄한다. 여기에서 절삭 및 분쇄되는 지반은 풍화암 이상의 암반층인 지지지반(12)인 것이 바람직하나 경우에 따라 단단한 토사층일 수도 있다.Then, the ground under the steel pipe pile body 2 is cut and pulverized into a cylindrical shape. The ground to be cut and pulverized here is preferably the supporting ground 12, which is a bedrock layer of weathered rock or higher, but may be a hard soil layer in some cases.
다음으로, (b) 상기 강관말뚝 본체(2) 하부의 절삭 및 분쇄된 지반에 주입재를 혼합하여 형성되는 원기둥 형상의 강화원지반(41)을 포함하는 선단보강부(4)를 형성한다(도 10의 (b)).Next, (b) the front end reinforcement part 4 including the cylindrical reinforced base 41 formed by mixing the injection material with the cut and pulverized ground under the steel pipe pile body 2 is formed (FIG. 10 of (b)).
상기 (b)단계에서는 상기 강관말뚝 본체(2) 하부의 절삭 및 분쇄된 지반에 주입재가 주입되어 원기둥 형상의 강화원지반(41)을 형성한다.In the step (b), the injection material is injected into the cut and pulverized ground under the steel pipe pile body 2 to form a cylindrical reinforced base 41.
상기 강관말뚝 본체(2) 하부의 지반은 지지강판(3) 하부의 폐쇄된 공간 내에서 절삭 및 분쇄되므로 매우 치밀한 상태이다. 따라서 남은 공극에 주입재가 주입되면 당초 지반보다 2배 이상의 지지력을 발휘할 수 있으며, 풍화암 지반의 경우 풍화암 내지 연암에 가까운 지지층을 형성할 수 있다.The ground under the steel pipe pile body 2 is in a very dense state because it is cut and pulverized in a closed space under the supporting steel plate 3. Therefore, when the injection material is injected into the remaining voids, it can exert a bearing capacity twice or more than that of the original ground, and in the case of weathered rock ground, a support layer close to weathered rock or soft rock can be formed.
상기 강화원지반(41)은 지지강판(3)의 하면까지 형성되어 지지강판(3)의 하중을 지지할 수 있다.The reinforcing base 41 is formed up to the lower surface of the supporting steel plate 3 to support the load of the supporting steel plate 3.
상기 강관말뚝 본체(2)의 하단에는 분쇄된 암반 지반 측으로 주입재를 주입하는 토출공(421)이 형성된 지지강관(42)이 구비되고, 상기 지지강관(42)의 하부 외주면에는 지반(1)을 절삭하는 절삭부(43)가 돌출 형성되어, 상기 (a) 단계에서 강관말뚝 본체(2) 하부의 지지지반(12)이 상기 절삭부(43)에 의해 절삭 및 분쇄될 수 있다. At the lower end of the steel pipe pile body 2, a support steel pipe 42 is provided with a discharge hole 421 for injecting the injection material into the crushed rock ground side, and the ground 1 is formed on the lower outer circumferential surface of the support steel pipe 42. The cutting part 43 for cutting is protruding, so that the supporting ground 12 under the steel pipe pile body 2 can be cut and pulverized by the cutting part 43 in step (a).
상기 강관말뚝 본체(2)에 지지강관(42)과 절삭부(43)가 구비된 경우, 강관말뚝 본체(2)의 회전 압입 시 지지강관(42)이 같이 회전하면서 동시에 절삭부(43)가 하부 지반을 절삭 및 분쇄하여 강화원지반(41)을 보다 용이하게 형성할 수 있다.When the steel pipe pile body 2 is provided with the support steel pipe 42 and the cutting portion 43, when the steel pipe pile body 2 is rotated and press-fitted, the support steel pipe 42 rotates together and the cutting portion 43 at the same time By cutting and pulverizing the lower ground, the reinforced base ground 41 can be more easily formed.
아울러 상기 지지강관(42)은 강관말뚝 본체(2)의 하단 내부에 상하로 이동 가능하게 구비되어, 상기 (a) 단계에서 지지강관(42)이 강관말뚝 본체(2)의 하단 내부에 수용된 상태에서 강관말뚝 본체(2)를 회전 압입하여 지중의 지지지반(12)까지 도달시킨 후 지지강관(42)을 회전시키면서 강관말뚝 본체(2) 하부로 하강시켜 강관말뚝 본체(2) 하부의 지지지반(12)이 절삭 및 분쇄되도록 구성할 수 있다. In addition, the support steel pipe 42 is provided to be movable up and down inside the lower end of the steel pipe pile body 2, and the support steel pipe 42 is accommodated inside the lower end of the steel pipe pile body 2 in step (a). After the steel pipe pile body 2 is press-fitted by rotation to reach the support ground 12 in the ground, the support steel pipe 42 is rotated and lowered to the lower part of the steel pipe pile body 2 to support the lower part of the steel pipe pile body 2 (12) can be configured to be cut and ground.
상기 강화원지반(41)은 강관말뚝 본체(2) 시공 시 동시에 시공될 수 있다. The reinforcement source ground 41 may be constructed simultaneously when the steel pipe pile body 2 is constructed.
다만, 관입 저항이 클 것으로 예상되는 경우에는 내부에 지지강관(42)이 수용된 상태에서 강관말뚝 본체(2)를 지반에 근입하여 선 시공한 후, 나중에 지지강관(42)을 하강하여 회전시키면서 강화원지반(41)을 시공하는 것도 가능하다.However, when the penetration resistance is expected to be large, the steel pipe pile main body 2 is inserted into the ground in a state where the support steel pipe 42 is accommodated therein and pre-constructed, and then the support steel pipe 42 is lowered and strengthened while rotating. It is also possible to construct the raw ground 41.
본 발명의 선단보강부가 구비된 복합 강관말뚝 및 이의 시공 방법은 강관말뚝 본체 하부에 강관말뚝 본체보다 직경이 크고 풍화암 이상의 지지력을 발휘하는 선단보강부가 구비되므로, 선단보강부의 상부에 1개의 헬릭스만 설치하여도 충분한 허용 연진지지력을 확보할 수 있어 말뚝 시공 시 관입 저항을 크게 줄이고 헬릭스 부착 비용 감소로 원가 절감이 가능하다는 점에서 산업상 이용 가능성이 있다.In the composite steel pipe pile with end reinforcement and its construction method of the present invention, since the end reinforcement having a larger diameter than the steel pipe pile main body and exerting a bearing capacity greater than that of weathered rock is provided at the bottom of the steel pipe pile body, only one helix is installed on the top of the end reinforcement. However, it has industrial applicability in that it is possible to secure sufficient permissible soft earthquake bearing capacity, greatly reduce penetration resistance during pile construction, and reduce costs by reducing helix attachment costs.

Claims (10)

  1. 지반(1)에 근입되는 강관말뚝 본체(2);A steel pipe pile body 2 embedded in the ground 1;
    상기 강관말뚝 본체(2)의 하부 외주면에 형성되는 링 형상의 지지강판(3); 및A ring-shaped support steel plate 3 formed on the lower outer circumferential surface of the steel pipe pile body 2; and
    상기 강관말뚝 본체(2)와 지지강판(3) 하부의 지반(1)을 절삭 및 분쇄하여 주입재를 혼합함으로써 형성되는 원기둥 형상의 강화원지반(41), 상기 강관말뚝 본체(2)의 하단에 구비되는 것으로 분쇄된 지지지반(12) 측으로 주입재를 주입하는 토출공(421)이 형성된 지지강관(42) 및 상기 지지강관(42)의 하부 외주면에 돌출 형성되어 지반(1)을 절삭하는 절삭부(43)를 포함하는 선단보강부(4); 로 구성되고, A cylindrical reinforced circular ground 41 formed by cutting and crushing the ground 1 under the steel pipe pile body 2 and the supporting steel plate 3 and mixing the injection material, provided at the lower end of the steel pipe pile body 2 A support steel pipe 42 having a discharge hole 421 for injecting an injection material into the pulverized support ground 12 side and a cutting part protruding from the lower outer circumferential surface of the support steel pipe 42 to cut the ground 1 ( 43) including a front end reinforcement (4); consists of,
    상기 절삭부(43)는 지지강관(42)의 외주면에 일단이 고정 결합되는 것으로 절삭부(43) 회전 방향 배면 측에 주입재가 토출되는 토출공(433)이 절삭부 1개당 3개 이상 구비되는 블레이드(431)를 포함하는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝.The cutting part 43 has one end fixedly coupled to the outer circumferential surface of the support steel pipe 42, and three or more discharge holes 433 for discharging the injection material are provided on the rear side of the cutting part 43 in the rotation direction per cutting part. A composite steel pipe pile equipped with a tip reinforcement, characterized in that it comprises a blade (431).
  2. 제1항에서,In paragraph 1,
    상기 지지강관(42)은 강관말뚝 본체(2)의 하단 내부에서 상하로 이동 가능하게 구비되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝.The support steel pipe 42 is a composite steel pipe pile equipped with a front end reinforcement, characterized in that provided to be movable up and down inside the lower end of the steel pipe pile body (2).
  3. 제1항에서,In paragraph 1,
    상기 주입재는 주제에 경화제가 혼합되어 팽창되는 팽창재인 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝.The injection material is a composite steel pipe pile equipped with a tip reinforcement, characterized in that the expansion material is expanded by mixing the hardener in the main material.
  4. 제3항에서,In paragraph 3,
    상기 지지강관(42)의 내부에는 상기 주제와 경화제 중 어느 하나가 수용되는 상부의 제1수용부(44)와 상기 주제와 경화제 중 나머지 하나가 수용되는 하부의 제2수용부(45)가 구비되고, 상기 제2수용부(45)는 상기 지지강관(42)의 토출공(421)과 연통되어 주제와 경화제의 혼합 시 주입재의 팽창압에 의해 주입재가 토출공(421)으로 토출되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝.The inside of the support steel pipe 42 is provided with a first accommodating part 44 in the upper part in which one of the main subject and the curing agent is accommodated and a second accommodating part 45 in the lower part in which the other one of the main subject and the curing agent is accommodated. And, the second accommodating portion 45 is in communication with the discharge hole 421 of the support steel pipe 42, and the injection material is discharged into the discharge hole 421 by the expansion pressure of the injection material when the main agent and the curing agent are mixed. A composite steel pipe pile equipped with a tip reinforcement part.
  5. 제4항에서,In paragraph 4,
    상기 제1수용부(44)와 제2수용부(45)는 분리막(46)에 의해 상호 분리되어 분리막(46)의 파열에 의해 주제와 경화제가 혼합되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝.The first accommodating part 44 and the second accommodating part 45 are separated from each other by a separation membrane 46, and the main material and the curing agent are mixed by the rupture of the separation membrane 46. steel pipe piles.
  6. 제5항에서,In paragraph 5,
    상기 제1수용부(44)의 상부에는 상부 타격에 의해 하부로 이동하여 상기 분리막(46)을 파열시키는 분리막 파열봉(47)이 상하로 슬라이딩 가능하게 구비되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝.The upper part of the first accommodating part 44 is provided with a front end reinforcement part, characterized in that a separation membrane rupturing rod 47 that moves downward by an upper blow and ruptures the separation membrane 46 is provided so as to be able to slide up and down. Composite steel pipe pile.
  7. 제6항에서,In paragraph 6,
    상기 제2수용부(45)의 내부에는 상기 토출공(421)에 삽입되어 토출공(421)을 폐쇄하는 개폐마개(481), 상기 분리막 파열봉(47)의 하부 위치에 구비되어 분리막 파열봉(47)의 하강 시 분리막 파열봉(47)의 가압에 의해 하부로 하강하는 가이드봉(482) 및 상기 가이드봉(482)과 개폐마개(481)를 연결하는 연결와이어(483)로 구성되는 토출공 자동개폐구(48)가 구비되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝.Inside the second accommodating part 45, an opening and closing stopper 481 inserted into the discharge hole 421 to close the discharge hole 421 is provided at a lower position of the membrane rupture rod 47 and the membrane rupture rod Discharge consisting of a guide rod 482 that descends downward by the pressure of the membrane rupture rod 47 when the membrane rupture rod 47 descends and a connecting wire 483 connecting the guide rod 482 and the opening and closing stopper 481. A composite steel pipe pile equipped with a tip reinforcement, characterized in that the ball automatic opening and closing opening (48) is provided.
  8. 제4항에서,In paragraph 4,
    상기 제1수용부(44)와 제2수용부(45) 상부의 지지강관(42) 외주면 또는 강관말뚝 본체(2)의 하단 외주면에는 슬라임 유입홀(22)이 구비되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝.A slime inlet hole 22 is provided on the outer circumferential surface of the support steel pipe 42 above the first accommodating portion 44 and the second accommodating portion 45 or on the outer circumferential surface of the lower end of the steel pipe pile body 2 Tip reinforcement, characterized in that Composite steel pipe piles with attachments.
  9. 제1항에 의한 선단보강부가 구비된 복합 강관말뚝을 시공하기 위한 것으로,It is for constructing a composite steel pipe pile equipped with a tip reinforcement according to paragraph 1,
    (a) 강관말뚝 본체(2)를 회전 압입하여 지중의 지지지반(12)까지 도달시키는 한편, 상기 강관말뚝 본체(2) 하부의 지지지반(12)을 상기 절삭부(43)에 의해 상기 강관말뚝 본체(2)보다 큰 지름으로 절삭 및 분쇄하는 단계; 및(a) The steel pipe pile body 2 is press-fitted by rotation to reach the support base 12 in the ground, while the support base 12 under the steel pipe pile body 2 is cut by the cutting portion 43 to reach the steel pipe pile body 2 cutting and grinding to a diameter larger than the pile body 2; and
    (b) 상기 강관말뚝 본체(2) 하부의 절삭 및 분쇄된 지반에 주입재를 혼합하여 형성되는 원기둥 형상의 강화원지반(41)을 포함하는 선단보강부(4)를 형성하는 단계; 로 구성되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝의 시공 방법.(b) forming a tip reinforcement part 4 including a cylindrical reinforced original ground 41 formed by mixing an injection material with the ground cut and pulverized under the steel pipe pile body 2; Construction method of a composite steel pipe pile equipped with a tip reinforcement, characterized in that consisting of.
  10. 제9항에서,In paragraph 9,
    상기 지지강관(42)은 강관말뚝 본체(2)의 하단 내부에 상하로 이동 가능하게 구비되어,The support steel pipe 42 is provided to be movable up and down inside the lower end of the steel pipe pile body 2,
    상기 (a) 단계에서 지지강관(42)이 강관말뚝 본체(2)의 하단 내부에 수용된 상태에서 강관말뚝 본체(2)를 회전 압입하여 지중의 지지지반(12)까지 도달시킨 후 지지강관(42)을 회전시키면서 강관말뚝 본체(2) 하부로 하강시켜 강관말뚝 본체(2) 하부의 지지지반(12)이 절삭 및 분쇄되는 것을 특징으로 하는 선단보강부가 구비된 복합 강관말뚝의 시공 방법.In the step (a), in the state where the support steel pipe 42 is accommodated inside the lower end of the steel pipe pile body 2, the steel pipe pile body 2 is press-fitted by rotation to reach the support base 12 in the ground, and then the support steel pipe 42 ) is lowered to the lower part of the steel pipe pile body (2) while rotating, so that the supporting ground (12) under the steel pipe pile body (2) is cut and pulverized.
PCT/KR2022/004536 2021-11-17 2022-03-30 Composite steel pipe pile provided with reinforced tip and construction method therefor WO2023090543A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2021-0158518 2021-11-17
KR1020210158518A KR102368634B1 (en) 2021-11-17 2021-11-17 A combined steel pile with reinforced tip and construction method thereof

Publications (1)

Publication Number Publication Date
WO2023090543A1 true WO2023090543A1 (en) 2023-05-25

Family

ID=80817484

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2022/004536 WO2023090543A1 (en) 2021-11-17 2022-03-30 Composite steel pipe pile provided with reinforced tip and construction method therefor

Country Status (2)

Country Link
KR (1) KR102368634B1 (en)
WO (1) WO2023090543A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102368634B1 (en) * 2021-11-17 2022-03-07 (주)삼일이엔씨 A combined steel pile with reinforced tip and construction method thereof
KR20240059275A (en) 2022-10-27 2024-05-07 박용희 in & out pin type pile unit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08120664A (en) * 1994-10-21 1996-05-14 Yoshida Tekkosho:Kk Agitating blade for ground improvement, and ground improving method employing agitating blade
JP2003176534A (en) * 2001-12-10 2003-06-24 Sekisui House Ltd Steel pipe pile and its construction method
JP2006207161A (en) * 2005-01-26 2006-08-10 Jfe Steel Kk Construction method of prefabricated pile
JP2013057194A (en) * 2011-09-08 2013-03-28 Chiyoda Geotech Co Ltd Rotary penetration steel pipe pile and construction method of foundation pile having foot protection
KR101785476B1 (en) * 2017-03-30 2017-10-17 주식회사 포유텍 Double ouger type reinforcing apparatus for ground of triple casing structure
KR102368634B1 (en) * 2021-11-17 2022-03-07 (주)삼일이엔씨 A combined steel pile with reinforced tip and construction method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070014547A (en) 2005-07-29 2007-02-01 기묘중건설 주식회사 Support reinforcement-machine fot tip of still pile pipe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08120664A (en) * 1994-10-21 1996-05-14 Yoshida Tekkosho:Kk Agitating blade for ground improvement, and ground improving method employing agitating blade
JP2003176534A (en) * 2001-12-10 2003-06-24 Sekisui House Ltd Steel pipe pile and its construction method
JP2006207161A (en) * 2005-01-26 2006-08-10 Jfe Steel Kk Construction method of prefabricated pile
JP2013057194A (en) * 2011-09-08 2013-03-28 Chiyoda Geotech Co Ltd Rotary penetration steel pipe pile and construction method of foundation pile having foot protection
KR101785476B1 (en) * 2017-03-30 2017-10-17 주식회사 포유텍 Double ouger type reinforcing apparatus for ground of triple casing structure
KR102368634B1 (en) * 2021-11-17 2022-03-07 (주)삼일이엔씨 A combined steel pile with reinforced tip and construction method thereof

Also Published As

Publication number Publication date
KR102368634B1 (en) 2022-03-07

Similar Documents

Publication Publication Date Title
WO2023090543A1 (en) Composite steel pipe pile provided with reinforced tip and construction method therefor
WO2018221933A1 (en) Casing guide apparatus for ground excavator, and excavation method using same
WO2017090975A1 (en) Tunnel construction method using pre-support and post-support and apparatus suitable for same
WO2017057804A1 (en) Driven concrete pile having open bottom and construction method thereof
EA007849B1 (en) Method of constructing a pile foundation
WO2018194394A1 (en) Cast-in-place integrated top pile base having lower pile and construction method thereof
KR101596660B1 (en) Apparatus and method for removing waste PHC pile of reclaimed land
KR20050114193A (en) A grout carrying out mehtod for paste backfill grouting at the cave
WO2023106764A1 (en) Rotational penetration-type composite steel pipe pile having expanded tip reinforcing portion and construction method thereof
KR101582068B1 (en) Ground anchor construction method for anchoring area extended improvement using extended excavation agitator
WO2016048025A1 (en) Excavating pump apparatus and pile installation apparatus comprising same
WO2020235980A1 (en) Bridge seat device for earthquake-proof and vibration-isolation reinforcement and method for installing same
WO2014027819A1 (en) Hammer bit and ground perforation method using same
WO2017043709A1 (en) Driven concrete pile and construction method thereof
CN112796296A (en) High-pressure rotary spraying combined PVC sleeve retaining wall earth surface reinforcing construction method
EP3318677B1 (en) Method for forming a reinforced pile and use of an accessory therein
WO2015174737A1 (en) Self-diameter-enlarging pile, and method for constructing same
WO2011142534A2 (en) Concrete pile and method for producing same
Manzouri et al. Repair and retrofit of unreinforced masonry structures
WO2024071531A1 (en) Deep cement mixing method including strength monitoring function of structure for reinforcing soft ground
WO2023163313A1 (en) Telephone pole reinforcing method for supplying grouting material into telephone pole, having foothold bolt holes, in order to reinforce telephone pole
US4190293A (en) Rock splitting attachment for a breaking hammer
WO2015122731A1 (en) Construction method for reinforcement of pile foundation ground by using tip-diameter-expanding pile, diameter-expanding apparatus for tip-diameter-expanding pile, and diameter-expanding-apparatus rotating-and-pressurising device
WO2016024673A1 (en) Diameter-enlarging system for expandable pile
JP3298574B2 (en) Blistering prevention device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22895755

Country of ref document: EP

Kind code of ref document: A1