Mixing equipment with adjustable cement discharge angle
Patent Information
- Application Number
- KR1020250009453
- Authority / Receiving Office
- KR · KR
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-07-29
Smart Images
Figure PAT00001_ABST
Abstract
Description
Technology Field
[0001] The present invention relates to a stirring bit capable of adjusting the cement discharge angle. Specifically, it relates to a technology that aims to maximize the efficiency of cement ejection operations and the quality of ground stabilization by providing a stirring bit used for reinforcement work to stabilize soft ground or ground at risk of collapse at construction and civil engineering sites, comprising an elbow pipe capable of adjusting the discharge angle of an injection material such as cement. Background Technology
[0002] The Compaction Grouting System (CGS), a method generally used to improve and stabilize soft ground or ground at risk of collapse, involves inserting injection pipes into the ground to be improved and injecting grout materials, such as mortar with a very low slump value, through the pipes to consolidate the surrounding soil while simultaneously forming a solidified body like a pile. Since construction is possible as long as a workspace for inserting the injection pipes is secured, this method is highly useful not only for improving ground where structures are to be built but also for improving ground where structures have already been constructed.
[0003] In addition, it is known that the ground reinforcement efficiency is excellent because, unlike when using general chemical grout, the grout penetrates into cracks in the ground to improve the ground, but rather the high-viscosity grout pushes out the soil in the ground and cures in place to form a homogeneous and solidified body, while simultaneously improving the ground through the consolidation of the surrounding ground.
[0004] For example, Korean registered patent No. 10-2108104 (Expansion device for soil cement injection equipment and SCIG method using the same) has proposed a technology for an expansion device equipped with a screw bit comprising a connecting part through which an injection passage for the injection material is formed, an expanding and excavating part in which an injection material supply passage communicating with the injection passage is formed at the bottom of the connecting part, and a screw formed protruding from the outer surface.
[0005] However, in the case of the aforementioned prior art, since the injection channel of the injection material is provided in the form of a simple discharge port, when the cement paste penetrates into soft ground and is discharged, the cement paste is discharged in a straight line, resulting in a problem where the cement paste is concentrated in the ground near the discharge port and is not evenly dispersed. Therefore, there is a need for research and development of technology that can expand the spraying range of the cement paste and improve the uniformity of its distribution. The problem to be solved
[0006] The purpose of the present invention is to provide a mixing bit used for reinforcement work to stabilize soft ground or ground at risk of collapse at construction and civil engineering sites, and to maximize the efficiency of cement ejection work and the quality of ground stabilization by providing a mixing bit that includes an elbow pipe capable of adjusting the discharge angle of the injection material, such as cement. means of solving the problem
[0007] To achieve the above-mentioned objective, a stirring bit capable of adjusting the cement discharge angle according to one embodiment of the present invention comprises: a stirring rod having a preset length and having a hollow portion formed in a straight line along the longitudinal direction inside to form a cement conveying line for conveying mixed cement; a screw blade having a shape that extends radially from the foremost end of the stirring rod to a forward area along the outer circumference and is coupled in a spiral shape, and having a plurality of bit heads formed facing forward on the extension surface; and a first elbow pipe coupled to a first discharge port located at the bottom of the extension surface of the screw blade to adjust the discharge angle of cement discharged through the first discharge port along the cement conveying line of the stirring rod to a preset angle range, wherein the first elbow pipe is characterized by changing the discharge angle of cement discharged through the first discharge port to an angle range of 40 to 65 degrees with respect to the rotation axis of the stirring rod.
[0008] In addition, it further includes a pair of mixing blades provided on both sides of the aforementioned stirring rod, provided on the rear portion spaced apart from the screw blade by a predetermined distance, and protruding and extending in a direction perpendicular to the longitudinal direction of the stirring rod; wherein the mixing blades are preferably provided such that one side mixing blade and the other side mixing blade are inclined in different directions with respect to the rotation axis of the stirring rod, and a plurality of bit heads protruding and extending forward are formed on the upper boundary surface of each mixing blade.
[0009] In addition, the stirring rod described above includes a second discharge port formed at the bottom of the inclined surface of one side mixing blade and a third discharge port formed at the bottom of the inclined surface of the other side mixing blade, and the second discharge port and the third discharge port are preferably provided with an extension line that extends in a straight line for a predetermined length along the protruding extension direction of each mixing blade.
[0010] Additionally, it further includes a second elbow pipe coupled to the second discharge port described above to control the discharge angle of the cement discharged through the second discharge port to a preset angle range; and a third elbow pipe coupled to the third discharge port to control the discharge angle of the cement discharged through the third discharge port to a preset angle range; and it is preferable that the second elbow pipe and the third elbow pipe change the discharge angle of the cement discharged through the second discharge port and the third discharge port to an angle range of 20 to 50 degrees with respect to the rotation axis of the stirring rod.
[0011] In addition, it is preferable that the aforementioned second elbow pipe and third elbow pipe have a structure such that one end is connected to an extension line provided at the second discharge port and the third discharge port, and after being bent at one end by a preset radius of curvature, extends to the other end, and the diameter of the elbow pipe gradually increases from one area on the extension path to the other end to the tip of the other end.
[0012] In addition, it is preferable that the aforementioned second elbow pipe and third elbow pipe be connected to the second discharge port and third discharge port in a separable manner through flange connection.
[0013] In addition, it is preferable that the aforementioned second discharge port and third discharge port can be shielded by a shielding cap for a flange provided separately after the second elbow pipe and the third elbow pipe are separated.
[0014] In addition, it is preferable that the direction in which the discharge end of the cement is formed in the second elbow pipe and the third elbow pipe described above is formed toward the rear side opposite to the protruding direction of the bit head formed on each mixing blade.
[0015] In addition, the first elbow tube described above may be provided in one or more places in the stirring rod, and it is preferable to have a structure in which the first discharge port is concealed by the extension surface of the screw blade.
[0016] In addition, the aforementioned stirring rod preferably has a conical end shape in which the diameter around the rotation axis of the stirring rod gradually decreases as it moves from a front area to the foremost area, and the conical end is preferably equipped with a plurality of bit heads protruding forward. Effects of the invention
[0017] According to one embodiment of the present invention, the present invention provides a stirring bit used for reinforcement work to stabilize soft ground or ground at risk of collapse at construction and civil engineering sites, wherein the stirring bit includes an elbow pipe capable of adjusting the discharge angle of the injection material, such as cement, thereby maximizing the efficiency of the cement ejection work and the quality of ground stabilization.
[0018] In addition, according to one embodiment of the present invention, when reinforcing soft ground, the structural stability of the soft ground can be improved by increasing the compressive strength and shear strength of the ground. In particular, the problem of ground imbalance caused by the concentration of cement paste sprayed onto the ground near the discharge port due to the direct ejection of cement paste from the discharge port can be easily resolved.
[0019] In addition, according to one embodiment of the present invention, the present invention proposes a stirring bit structure that allows the contractor to adopt and use the discharge end sizes of the second elbow pipe and the third elbow pipe, thereby enabling easy reinforcement work suitable for the characteristics of the ground, and thus the stirring bit can be used to perform reinforcement work on ground with various environmental characteristics. Brief explanation of the drawing
[0020] FIG. 1 is an example of a conventional stirring bit in which the cement discharge angle cannot be adjusted. FIG. 2 is a front view of a stirring bit capable of adjusting the cement discharge angle according to one embodiment of the present invention. FIGS. 3 and 4 are examples of side views of a stirring bit capable of adjusting the cement discharge angle according to one embodiment of the present invention. FIG. 5 is an example of a plan view illustrating the structural form of a first elbow tube formed on a stirring rod according to one embodiment of the present invention. FIGS. 6 and 7 are examples of the formation of a mixing blade, a second and a third elbow tube according to an embodiment of the present invention. FIG. 8 is an example illustrating the overall shape of a stirring bit capable of adjusting the cement discharge angle according to one embodiment of the present invention. Specific details for implementing the invention
[0021] Hereinafter, various embodiments and / or aspects are disclosed with reference to the drawings. For illustrative purposes, numerous specific details are disclosed in the following description to aid in a general understanding of one or more aspects. However, it will also be recognized by those skilled in the art that these aspects may be practiced without such specific details. The following description and the accompanying drawings describe specific exemplary aspects of one or more aspects in detail. However, these aspects are exemplary, and some of the various methods in the principles of the various aspects may be used, and the description is intended to include all such aspects and their equivalents.
[0022] As used herein, terms such as "examples," "examples," "aspects," "examples," etc., may not be interpreted as implying that any aspect or design described is better or more advantageous than other aspects or designs.
[0023] Additionally, the terms “comprising” and / or “comprising” should be understood to mean that the relevant feature and / or component is present, but not to exclude the presence or addition of one or more other features, components and / or groups thereof.
[0024] Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any of a plurality of related described items.
[0025] Furthermore, in the embodiments of the present invention, all terms used herein, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in the embodiments of the present invention.
[0026] The present invention relates to a stirring bit capable of adjusting the cement discharge angle. Specifically, the purpose of the present invention is to provide a stirring bit used for reinforcement work to stabilize soft ground or ground at risk of collapse at construction and civil engineering sites, and to maximize the efficiency of cement ejection work and the quality of ground stabilization by providing a stirring bit that includes an elbow pipe capable of adjusting the discharge angle of an injection material such as cement.
[0027] Hereinafter, a detailed description of the present invention for achieving the above objectives will be provided with reference to the attached drawings, and multiple drawings may be simultaneously referenced to describe one or more technical features or components constituting the invention.
[0028] The Compaction Grouting System (CGS), a method generally used to improve and stabilize soft ground or ground at risk of collapse, involves inserting injection pipes into the ground to be improved and injecting grout materials, such as mortar with a very low slump value, through the pipes to consolidate the surrounding soil while simultaneously forming a solidified body like a pile. Since construction is possible as long as a workspace for inserting the injection pipes is secured, this method is highly useful not only for improving ground where structures are to be built but also for improving ground where structures have already been constructed.
[0029] In particular, this method is known to have excellent ground reinforcement efficiency because, unlike when using general chemical grout, the grout penetrates into cracks in the ground to improve the ground, but rather the high-viscosity grout pushes out the soil and cures on the spot to form a homogeneous and solidified body, while simultaneously improving the ground through the consolidation of the surrounding ground.
[0030] In the attached drawings, FIG. 1 schematically illustrates the structure of a stirring bit invented by the applicant prior to the present application. Specifically, FIG. 1 (A) shows a front view of a conventional stirring bit, and FIG. 1 (B) shows a side view of a conventional stirring bit.
[0031] Specifically, the applicant has proposed a stirring bit in which, as a main component of the stirring rod (10) of the prior invention, a screw blade (20) with a spiral structure is formed at the front to push out soil from the soft ground, and cement paste is discharged through a discharge port formed at the bottom of the screw blade (20) to cure the cement paste in the place where the soil from the soft ground has been pushed out so as to improve the ground, and a mixing blade (40) extending horizontally from both sides of the stirring rod (10) is formed at the rear of the stirring rod (10) to promote mixing of the injection material and the ground.
[0032] Meanwhile, the applicant has identified a problem in which cement paste is concentrated around the discharge port and not evenly dispersed in a stirring bit having the configuration described above. Accordingly, the applicant has researched technical means to expand the spray range of the cement paste and improve the uniformity of its distribution, and has developed the main configuration of the present invention described below.
[0033] Referring to FIG. 2, the description of the present invention is further elaborated. The present invention includes, as a main component, a stirring rod (10), a screw blade (20), and a first elbow pipe (30).
[0034] At this time, the stirring rod (10) described above has a predetermined length and has a structure in which a hollow section formed in a straight line along the length direction is provided inside to form a cement conveying line for conveying mixed cement.
[0035] Of course, the aforementioned cement conveying line may be replaced not only with cement but also with injection materials used for ground improvement, such as mortar with increased strength obtained by adding sand to cement, and the present invention is not limited thereto.
[0036] In addition, as an example embodiment, the pre-set length of the stirring rod (10) described above may have a length of 1,400 to 2,000 mm, and the diameter may have an outer diameter of 700 to 900 mm and an inner diameter of 80 to 200 mm that serves as a path for injecting cement paste, but the present invention is not limited thereto.
[0037] In addition, as an example, the stirring rod (10) described above must be supported with excellent rigidity, durability, and wear resistance, so it may be provided with a material including at least one of carbon steel, alloy steel, cast iron, stainless steel, or a composite material combining carbon steel and cemented carbide or ceramic composite, and the present invention is not limited thereto.
[0038] However, the stirring rod (10) of the present invention is formed with a conical end shape in which the diameter centered on the rotation axis (R) of the stirring rod (10) gradually decreases as it moves from the front area to the very front. At this time, the conical end described above means having a symmetrical structure with respect to the rotation axis (R), and for example, the angle of the cone can have an angle of 20 to 45 degrees with respect to the rotation axis. Meanwhile, such a conical end structure can increase penetration power by reducing resistance to the ground, thereby driving an improvement in work efficiency for ground reinforcement work.
[0039] In this case, as a more preferred embodiment, the conical end described above is provided with a plurality of bit heads (101) protruding forward at the uppermost end.
[0040] The bit head (101) described above is preferably made of cemented carbide or wear-resistant steel to provide high durability and strength, and in the case of its arrangement structure, it is distributed at regular intervals on the surface of the conical end so as to disperse the resistance of the ground, thereby providing substantial assistance in enabling the stirring rod (10) to penetrate deep into the ground.
[0041] Meanwhile, the screw blade (20) described above has a shape that is spirally connected and extends radially for a predetermined length along the outer circumference from the foremost part of the stirring rod (10) described above to a forward area, and is characterized by having a plurality of bit heads (201) formed facing forward on the extended surface.
[0042] In one embodiment, the screw blade (20) described above is coupled to the stirring rod (10) in a manner that extends from the foremost part of the stirring rod (10) to a forward area, thereby improving the efficiency of moving injection materials, including cement paste, and cutting the ground.
[0043] Specifically, the screw blade (20) can provide continuous and uniform cutting force through its spiral structure, thereby helping the stirring rod (10) to easily penetrate the ground. In particular, in the present invention, as described above, the end of the stirring rod (10) has a conical end, and thus the ground penetration efficiency can be maximized due to the structural features of the screw blade (20) and the stirring rod (10) described above.
[0044] In addition, as an example, on the extended surface of the screw blade (20) described above, a plurality of bit heads protruding forward on one side facing the ground to be penetrated may be arranged at predetermined intervals.
[0045] This bit head (201) functions to cut or crush the ground together with the rotational movement of the screw blade (20), and also functions to form a path that allows an injection material, such as cement paste, discharged through the first discharge port (300) described later to easily penetrate into the ground.
[0046] In addition, the screw blade (20) described above has a structure that extends spirally along the outer circumference of the stirring rod (10) from the foremost part of the stirring rod (10) to a forward area along a conical end, and the extension surface may have a predetermined inclination in a form that slopes upward radially from the outer circumference of the stirring rod (10), which can be understood as a configuration to increase the cutting force that penetrates the ground by giving the screw blade (20) a predetermined inclination.
[0047] On the other hand, the present invention includes a first elbow pipe (30) that is coupled with a first discharge port (300) located at the bottom of the extended surface of the screw blade (20) as described above, and adjusts the discharge angle of the cement discharged through the first discharge port (300) along the cement transfer line of the stirring rod (10) to a preset angle range.
[0048] At this time, the first elbow pipe (30) described above is structured to change the discharge angle of the cement discharged through the first discharge port (300) to a range of 40 to 65 degrees (most preferably 45 degrees) with respect to the rotation axis (R) of the stirring rod (10), as shown in the side view of FIGS. 3 and 4, and can have a design structure as shown in FIG. 5 when viewed in a plan view.
[0049] In other words, this can be understood as a configuration to resolve the problem where, when cement paste is discharged through the first discharge port (300) without the existence of the first elbow pipe (30) in the past, the cement paste is discharged in a straight line and the cement paste is concentrated only in the ground near the discharge port. The first elbow pipe (30) having this design structure can be understood as performing the function of inducing the cement paste to be dispersed over a wider area of the ground by adjusting the discharge direction of the cement paste ejected through the first discharge port (300) through the first elbow pipe (30). In the present invention, by means of this first elbow pipe (30), the problem of the penetration depth of the cement paste being limited by having a structure in which the cement paste is sprayed directly from the conventional discharge port is resolved, and by adjusting the discharge direction and spray pressure of the cement paste through the first elbow pipe (30), the cement paste can penetrate to a deep layer of the ground, thereby resolving the problem of the mixture, such as cement paste, being excessively concentrated only in a specific area.
[0050] In particular, when the cement paste is distributed over a sufficiently wide area by the first elbow pipe (30), the empty space inside the ground can be evenly filled, and as a result, when reinforcing the soft ground, the increase in the compressive strength and shear strength of the ground can be promoted, thereby contributing to improving the structural stability of the soft ground.
[0051] However, in this case, the first elbow pipe (30) described above may have a structure in which the discharge end of the first elbow pipe (30) is concealed by the extension surface of the screw blade (20), in addition to being installed at the bottom of the extension surface of the screw blade (20). This can be understood as a structural design concept to protect against the risk of wear, impact, or deformation by preventing the first elbow pipe (30) from coming into direct contact with the ground when ground penetration is made by the screw blade (20).
[0052] In other words, the present invention can be understood as providing a stirring bit structure that minimizes physical contact with the ground by concealing the first elbow pipe (30) at the bottom (i.e., below) of the extension surface of the screw blade (20), thereby maintaining the stability of the elbow pipe without direct impact being transmitted to the elbow pipe from the hard rock layer or gravel side.
[0053] In addition, the first elbow pipe (30) described above may be provided as one in the stirring rod (10) as in the embodiment described above, but it is also possible to provide two or more. When the first elbow pipe (30) is provided as two or more, it may be provided with a structure that is concealed at the bottom of the extended surface of the screw blade (20) described above and arranged along a predetermined interval, thereby enabling uniform ejection of the cement paste during ground infiltration.
[0054] Meanwhile, as also illustrated in FIG. 2, in a more preferred embodiment of the present invention, a pair of mixing blades (40) may be further included, which are provided on both sides of the stirring rod (10), are provided on the rear part of the stirring rod (10) at a predetermined distance from the screw blade (20) described above, and extend outward in a direction perpendicular to the longitudinal direction of the stirring rod (10) to function to mix the ground crushed by the screw blade (20) with the injection material.
[0055] As an example of one embodiment, the mixing blade (40) described above may have one side mixing blade (40) and the other side mixing blade (40) forming inclined surfaces in the same direction with respect to the rotation axis (R) of the stirring rod (10), but most preferably, as shown in FIG. 2 and 6, they are provided in a shape inclined in different directions.
[0056] With reference to the drawing in FIG. 2, the mixing blade (40) is horizontally extended in a direction perpendicular to the rotation axis (R) on both sides of the stirring rod (10). If one side mixing blade (40) has a downwardly inclined surface from the front of the stirring rod (10) toward the rear side of the stirring rod (10), the other side mixing blade (40) may be provided with a structure having an upwardly inclined surface from the front of the stirring rod (10) toward the rear side of the stirring rod (10) to correspond to this inclined surface.
[0057] Meanwhile, according to the structure of the mixing blade (40), the mixing blades (40) on both sides form inclined surfaces in different directions, thereby providing an effect of offsetting the unbalanced reaction force generated by the stirring bit rotating in one direction, and thus providing stability so that the stirring rod (10) does not shake or deviate during rotational movement.
[0058] In addition, the structure of the mixing blade (40) can function to more thoroughly mix the crushed ground and the injection material, including cement paste, by rotating the mixing blade (40) inclined in different directions in one direction to fill the voids in the ground, while simultaneously increasing the bonding strength between the injection material and the ground. Through this function, the strength and durability of the soft ground are increased, and the quality of ground reinforcement can be expected to improve.
[0059] Of course, at this time, a plurality of bit heads (401) protruding forward are formed on the upper boundary surface of each mixing blade (40) to assist in crushing the ground with the screw blade (20), and may contribute to increasing the efficiency of ground reinforcement by guiding the direction of movement of the cement paste injected through the second discharge port (400a) and the third discharge port (400b) to be described later, but the present invention is not limited thereto.
[0060] Meanwhile, the stirring rod (10) described in the present invention may further include a second discharge port (400a) formed at the bottom of the inclined surface of one side mixing blade (40) and a third discharge port (400b) formed at the bottom of the inclined surface of the other side mixing blade (40), in addition to the first discharge port (300) coupled with the first elbow pipe (30) described above.
[0061] With reference to FIG. 6, the above-described second discharge port (400a) and third discharge port (400b) are individually provided with an extension line that extends in a straight line for a predetermined length along the protruding extension direction of the adjacently installed mixing blade (40). This extension line can be understood as a concept of configuration to adjust the ground penetration depth of the injection material, such as cement paste, discharged from the second discharge port (400a) and the third discharge port (400b) to be relatively deeper. The direction in which the discharge end of the cement paste is formed in the second elbow pipe (41) and the third elbow pipe (42) is formed to the rear side opposite to the protruding direction of the bit head (401) formed on each mixing blade (40).
[0062] Meanwhile, setting the rear side opposite to the protruding direction of the bit head (401) formed on the mixing blade of the discharge ends of the aforementioned second elbow pipe (41) and third elbow pipe (42) as the discharge direction of the cement paste can be understood as a configuration to ensure uniformity of ground reinforcement by allowing the ground material crushed by the front screw blade (20) to naturally mix with the cement paste discharged from the second elbow pipe (41) and third elbow pipe (42).
[0063] In addition, by having the discharge ends of the second elbow pipe (41) and the third elbow pipe (42) face the rear side, the possibility of collision with the stirring performed by the front bit head can be minimized, and cement paste can be sprayed in the opposite direction to the direction of ground penetration, thereby minimizing the loss of unnecessary materials and providing the effect of effectively supplying cement only to the target area.
[0064] In addition, as a more preferred embodiment, the present invention further comprises, for easier control of the ejection direction and ejection diameter of an injection material such as cement paste discharged from the second discharge port (400a) and the third discharge port (400b) described above, a second elbow pipe (41) coupled to the second discharge port (400a) to control the ejection angle of the cement paste discharged through the second discharge port (400a) to a preset angle range, and a third elbow pipe (42) coupled to the third discharge port (400b) described above to control the ejection angle of the cement paste discharged through the third discharge port (400b) to a preset angle range.
[0065] Specifically, the second elbow pipe (41) described above is structured to have a structure that bends the discharge angle of the cement discharged along the extension line of the second discharge port (400a) in a range of 20 to 50 degrees with respect to the rotation axis (R) of the stirring rod (10) to adjust the discharge angle of the cement paste, and the third elbow pipe (42) is structured to have a structure that bends the discharge angle of the cement discharged along the extension line of the third discharge port (400b) in a range of 20 to 50 degrees with respect to the rotation axis (R) of the stirring rod (10) to adjust the discharge angle of the cement paste.
[0066] More specifically, the second elbow pipe (41) and the third elbow pipe (42) have a structure in which one end is connected to the extension line of the second discharge port (400a) and the third discharge port (400b), and after being bent at a pre-set radius of curvature to adjust the discharge angle, it extends to the other end.
[0067] At this time, the radius of curvature described above can be understood as a concept of a radius of curvature such that the center of the cement paste discharge line is angled in the range of 20 to 50 degrees with respect to the axis of rotation (R).
[0068] Meanwhile, the second elbow pipe (41) and the third elbow pipe (42) described above may have the same diameter from one area on the extension path to the other end to the tip of the other end as shown in (A) of FIG. 7, but preferably, the second elbow pipe (41) and the third elbow pipe (42) may have a tapered shape in cross-section by gradually increasing the diameter of the elbow pipe from one area on the extension path to the other end to the tip of the other end, thereby allowing the cement paste to be dispersed at a wide angle at the discharge end of the second elbow pipe (41) and the discharge end of the third elbow pipe (42), so as to induce the cement paste to spread evenly over a wide area of the soft ground to be reinforced.
[0069] In addition, in the present invention, due to the shape characteristics of the discharge ends of the second elbow pipe (41) and the third elbow pipe (42), the injection pressure of the injection material is reduced as the injection material moves from a narrow diameter to a wide diameter, thereby preventing problems such as the injection material being ejected at an excessive speed, which could damage the surrounding environment of the soft ground or cause injection imbalance. In other words, it can help stabilize the flow of the cement face, and because the wide diameter of the discharge end allows for ground reinforcement over a wider area with a single ejection, it can shorten the ground reinforcement work time and enable efficient work.
[0070] Meanwhile, the aforementioned second elbow pipe (41) and third elbow pipe (42) may be welded to the second discharge port (400a) and third discharge port (400b) to form an integral connection, but preferably, they may be provided in a form that is separable through the connection of the second discharge port (400a) and third discharge port (400b) with the flange (410, 420).
[0071] In one embodiment, the present invention may function to selectively combine a second elbow pipe (41) and a third elbow pipe (42) that are bent with various radii of curvature according to working conditions to the extension line of the second discharge port and the extension line of the third discharge port (400b), or to selectively combine a second elbow pipe (41) and a third elbow pipe (42) having discharge ends of various diameters.
[0072] For example, in the case where the ground is soft ground or sandy soil with a high porosity, the diameters of the second elbow pipe (41) and the third elbow pipe (42) are increased in the present invention so that an injection material such as cement paste is sprayed over a wide area, while the discharge pressure at the discharge end is reduced so that the injection material is evenly dispersed without damaging the soft ground, thereby simultaneously preventing subsidence of the soft ground and increasing its strength.
[0073] As another embodiment, when the ground consists of a gravel layer, a rock layer, or a clayey ground with small pores and high density, it is necessary to concentrate the injection material, such as cement paste, in a narrow area. Accordingly, the present invention adopts a small diameter for the discharge ends of the second elbow pipe (41) and the third elbow pipe (42) so that the injection material, such as cement paste, can be injected into the high-density ground at high pressure, thereby allowing the injection material to penetrate smoothly into the small pores.
[0074] In other words, the present invention proposes a stirring bit structure that allows the contractor to adopt and use the discharge end sizes of the second elbow pipe (41) and the third elbow pipe (42), thereby enabling easy reinforcement work suitable for the characteristics of the ground.
[0075] Meanwhile, in the present invention, there may exist a working environment where, due to the conditions of the ground to be reinforced, the discharge of cement paste from the first elbow pipe (30) is required, but the discharge of cement paste from the second elbow pipe (41) and the third elbow pipe (42) is not separately required.
[0076] For example, there may be cases where the surface layer of the ground is limitedly soft ground. In this case, since the surface layer of the ground can be reinforced solely by the cement paste discharged through the first elbow pipe (30), the second elbow pipe (41) and the third elbow pipe (42), which have a separable structure, are released from separation at the second discharge port (400a) and the third discharge port (400b). The second discharge port (400a) and the third discharge port (400b), where the second elbow pipe (41) and the third elbow pipe (42) are separated, are shielded by a shielding cap (411) for a separately provided flange (410, 420), thereby preventing the cement paste injected through the stirring rod (10) from being discharged into the second discharge port (400a) and the third discharge port (400b).
[0077] That is, although the shielding cap (411) is depicted in extremely schematic terms in (B) of FIG. 7, the shielding cap (411) for the flanges (410, 420) described above may further include a sealing device such as an O-ring member or a gasket between the shielding cap (411) and the flanges (410, 420) so that a seal can be maintained even in a high-pressure environment, and may be made of a high-strength metal material (e.g. stainless steel, carbon steel, or wear-resistant alloy) so as to withstand extreme environments such as high pressure, friction, and chemical corrosion, and may have a bolt-fastening or snap-on detachment method.
[0078] That is, the present invention can be understood as having a configuration in which the second elbow pipe (41) and the third elbow pipe (42) are connected to the extension lines of the second discharge port (400a) and the third discharge port (400b) when necessary, and then the connection can be released from the extension lines of the second discharge port (400a) and the third discharge port (400b) depending on the working conditions. Through this, the present invention enables a single stirring bit to perform reinforcement work on ground having various environmental characteristics.
[0079] Meanwhile, referring to FIG. 8, the overall shape of the stirring bit described above can be observed. FIG. 8 (A) shows an example of a cross-sectional view of the right side of the stirring bit described in the present invention, and FIG. 8 (B) shows an example of a cross-sectional view of the left side of the stirring bit described in the present invention.
[0080] In (A) and (B) of FIG. 8, the shape of the screw blade (20) formed on the stirring rod (10) and the mixing blade (40) can be seen as a cross-sectional view, and the shape of the bit head (101) formed on the end of the screw blade (20) and the bit head (401) formed on the mixing blade (40) can be seen.
[0081] In addition, Figures 8 (A) and (B) schematically show a conveying line connected to a cement pump and acting as a passage to convey cement to the stirring bit of the present invention, and a structure is shown in which this conveying line and the stirring bit of the present invention are connected to each other by means of connecting parts such as a connector.
[0082] In addition, in (A) and (B) of FIG. 8, a first discharge port (300) located at the bottom of the extended surface of the screw blade (20), and a second discharge port (400a) and a third discharge port (400b) formed at the bottom of the inclined surface of the mixing blade (40) can be seen, and cement pumped from the cement pump is pumped along the direction of the arrow indicated in (A) and (B) of FIG. 8 to form a discharge path toward the first, second, and third discharge ports (300, 400a, 400b).
[0083] Meanwhile, although not explicitly shown in FIG. 8, the discharge angle of the first, second, and third discharge ports (300, 400a, 400b) may be controlled to a preset angle along the aforementioned first elbow pipe (30), second elbow pipe (41), and third elbow pipe (42). According to one embodiment of the present invention described above, the present invention provides a stirring bit used for reinforcement work to stabilize soft ground or ground at risk of collapse at construction and civil engineering sites, and provides a stirring bit including an elbow pipe capable of adjusting the discharge angle of the injection material, such as cement, thereby maximizing the efficiency of the cement ejection work and the quality of ground stabilization.
[0084] In addition, according to one embodiment of the present invention, when reinforcing soft ground, the structural stability of the soft ground can be improved by increasing the compressive strength and shear strength of the ground. In particular, the problem of ground imbalance caused by the concentration of cement paste sprayed onto the ground near the discharge port due to the direct ejection of cement paste from the discharge port can be easily resolved.
[0085] In addition, according to one embodiment of the present invention, by proposing a stirring bit structure that allows the contractor to adopt and use the discharge end sizes of the second elbow pipe (41) and the third elbow pipe (42), reinforcement work suitable for the characteristics of the ground can be easily performed, thereby enabling the stirring bit to perform reinforcement work on ground with various environmental characteristics.
[0086] Although the embodiments have been described above with reference to limited embodiments and drawings, those skilled in the art will understand that various modifications and variations are possible from the description above. Terms such as "include," "compose," or "have" as described above imply that components may be inherent unless specifically stated otherwise; therefore, they should be interpreted as allowing for the inclusion of additional components rather than excluding other components. Furthermore, the scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.
Claims
Claim 1 A stirring bit capable of adjusting the cement discharge angle comprises: a stirring rod having a preset length and having a hollow portion formed in a straight line along the longitudinal direction inside to form a cement conveying line for conveying mixed cement; a screw blade having a shape that is radially extended from the foremost end of the stirring rod to a forward area along the outer circumference and coupled in a spiral manner, with a plurality of bit heads formed facing forward on the extension surface; and a first elbow pipe coupled to a first discharge port located at the bottom of the extension surface of the screw blade to adjust the discharge angle of cement discharged through the first discharge port along the cement conveying line of the stirring rod to a preset angle range, wherein the first elbow pipe is characterized by changing the discharge angle of cement discharged through the first discharge port to an angle range of 40 to 65 degrees with respect to the rotation axis of the stirring rod. Claim 2 A stirring bit capable of adjusting the cement discharge angle, wherein, in claim 1, a pair of mixing blades are provided on both sides of the stirring rod, are provided on a rear portion spaced apart from the screw blade by a predetermined distance, and are protruded and extended in a direction perpendicular to the longitudinal direction of the stirring rod; wherein the mixing blades are provided such that one side mixing blade and the other side mixing blade are inclined in different directions with respect to the rotation axis of the stirring rod, and a plurality of bit heads protruding and extended forward are formed on the upper boundary surface of each mixing blade. Claim 3 A stirring bit capable of adjusting the cement discharge angle, wherein, in paragraph 2, the stirring rod comprises a second discharge port formed at the bottom of the inclined surface of the one-sided mixing blade and a third discharge port formed at the bottom of the inclined surface of the other-sided mixing blade, and the second discharge port and the third discharge port are each provided with an extension line that extends in a straight line for a predetermined length along the protruding extension direction of the respective mixing blade. Claim 4 A stirring bit capable of adjusting the cement discharge angle according to claim 3, further comprising: a second elbow pipe coupled to the second discharge port to control the discharge angle of cement discharged through the second discharge port to a preset angle range; and a third elbow pipe coupled to the third discharge port to control the discharge angle of cement discharged through the third discharge port to a preset angle range; wherein the second elbow pipe and the third elbow pipe are characterized in that the discharge angle of cement discharged through the second discharge port and the third discharge port is changed to an angle range of 20 to 50 degrees with respect to the rotation axis of the stirring rod. Claim 5 A stirring bit capable of adjusting the cement discharge angle, characterized in that, in claim 4, the second elbow pipe and the third elbow pipe are formed with a structure such that one end is connected to an extension line provided at the second discharge port and the third discharge port, and after being bent at the one end by a preset radius of curvature, the elbow pipe is extended to the other end, and the diameter of the elbow pipe is gradually expanded from one area on the extension path to the other end to the tip of the other end. Claim 6 A stirring bit capable of adjusting the cement discharge angle, characterized in that, in claim 4, the second elbow pipe and the third elbow pipe are connected to the second discharge port and the third discharge port in a separable manner through flange connection. Claim 7 A stirring bit capable of adjusting the cement discharge angle, characterized in that, in claim 4, the second discharge port and the third discharge port can be shielded by a shielding cap for a flange provided separately after the second elbow pipe and the third elbow pipe are separated. Claim 8 A stirring bit capable of adjusting the cement discharge angle, characterized in that, in claim 4, the second elbow pipe and the third elbow pipe are formed such that the direction in which the cement discharge end is formed is formed toward the rear side opposite to the protruding direction of the bit head formed on each mixing blade. Claim 9 A stirring bit capable of adjusting the cement discharge angle, characterized in that, in claim 1, the first elbow tube may be provided in one or more places on the stirring rod, and the discharge end of the first elbow tube is concealed by the extension surface of the screw blade. Claim 10 A stirring bit capable of adjusting the cement discharge angle, characterized in that, in claim 1, the stirring rod has a conical end shape in which the diameter around the rotation axis of the stirring rod gradually decreases as it moves from the front one region toward the front, and the conical end is provided with a plurality of bit heads protruding toward the front.