Spiral hole-forming drill bit suitable for soil body containing soft soil layer

Abstract

The utility model relates to the technical field of spiral pressure grouting pile drilling, in particular to a spiral hole-forming drill bit suitable for a soil body containing a soft soil layer, which comprises a long spiral drill rod and a protective plate assembly, the long spiral drill rod comprises a drill rod main body and a spiral blade which are controlled to rotate, and a through material channel is formed in the drill rod main body along the axial direction of the drill rod main body. According to the spiral hole-forming drill bit suitable for the soil body containing the soft soil layer, the arc-shaped protection plates are arranged in pairs and symmetrically installed on the two sides of the drill rod body respectively, the protection plate assemblies can form a cylindrical surface when the drill rod body rotates, the cylindrical surface abuts against the inner wall of a drill hole, and therefore the effective supporting and protection effects are provided in the drilling process; the problem that the hole diameter does not meet the design requirement due to collapse of the hole wall is solved, sludge scraped off by the arc-shaped protection plate can be sent out of the drilled hole through the spiral blade through cooperation of the spiral blade, the sludge on the hole wall is effectively prevented from being mixed into concrete, and the bearing capacity of the pile body is guaranteed.

Description

Technical Field

[0001] The utility model relates to a hole-forming drill bit for drilling long spiral pressure-cast piles, in particular to a spiral hole-forming drill bit suitable for soil bodies containing soft soil layers. Background Art

[0002] Traditional long spiral grouting pile drill bits usually consist of a long spiral drill rod and spiral blades. The interior of the long spiral drill rod is constructed with a through material channel along the axial direction, and a shotcrete drill bit is provided at one end of the drill rod body. The spiral blades are arranged around the outer circumference of the drill rod body in a spiral extension manner. This structure allows the drill bit to transport concrete through the material channel inside the drill rod during the drilling process, and spray the concrete into the drill hole through the shotcrete drill bit to form the pile body.

[0003] However, traditional long spiral grouting drill bits present several challenges during construction. For example, when the soil to be drilled is deep underground and contains fluidized and / or soft plastic layers, shrinkage can easily occur during the drilling process. During concrete spraying, mud residue from the hole wall can mix into the concrete, preventing the pile from achieving its intended bearing capacity. Furthermore, when the hole wall collapses, the hole diameter falls short of the designed diameter, preventing the steel cage from being lowered smoothly. Furthermore, severe hole wall collapse can bury the drill rod, causing it to become stuck. Therefore, a spiral drilling bit suitable for soils containing soft layers is needed to address these issues. Utility Model Content

[0004] The purpose of the utility model is to provide a spiral drilling drill bit suitable for soil with soft soil layers, so as to solve the problems of shrinkage, hole wall collapse and drill rod jamming that are prone to occur in the drilling process of such soil by traditional long spiral grouting pile drill bits, improve the safety and efficiency of drilling construction, and ensure the quality and bearing capacity of the pile body.

[0005] The technical solution adopted by the utility model to solve the above problems is: a spiral hole drilling drill bit suitable for soil containing soft soil layers, characterized by comprising:

[0006] Long auger rod, including:

[0007] A drill rod body, wherein the interior of the drill rod body is provided with a through material channel along its own axial direction, and a shotcrete drill bit is provided at one end of the drill rod body.

[0008] The spiral blade is arranged around the outer circumference of the drill rod body in a spiral extending manner.

[0009] Guard plate assembly, including:

[0010] Arc-shaped guard plates are provided in pairs, and the two arc-shaped guard plates are symmetrically arranged on both sides of the drill rod body to rotate with the drill rod body. The outer side of the arc-shaped guard plate is constructed as a first arc surface, and the extension direction of the first arc surface is perpendicular to the axial direction of the drill rod body, so that when the arc-shaped guard plate rotates with the drill rod body, a cylindrical surface is formed to abut against the inner wall of the drill hole.

[0011] A fixing member is fixedly arranged on the outside of the drill rod body. And

[0012] The connecting piece is fixedly connected to the inner side surface of the arc-shaped guard plate and the surface of the fixing piece, so that the arc-shaped guard plate, the connecting piece and the fixing piece are connected as a whole.

[0013] Preferably, the inner side surface of the arc-shaped guard plate is constructed as a second arc surface, and the distance between the inner side surface of the arc-shaped guard plate and the edge of the spiral blade is less than 1 cm.

[0014] Preferably, the center of the circle corresponding to the first arc surface coincides with the center of the circle corresponding to the second arc surface, and the axis of the drill rod body passes through the center of the circle corresponding to the second arc surface.

[0015] Preferably, an axil reinforcement plate is provided between the arc-shaped guard plate and the connecting member.

[0016] Preferably, the arc-shaped guard plate extends toward the drill rod body from one end of the shotcrete drill bit to form a conical structure, the conical structure converges toward the shotcrete drill bit, and the conical structure is constructed as a conical surface on the side away from the drill rod body.

[0017] Preferably, the convergence angle of the tapered structure should be less than 2°.

[0018] Preferably, the fixing part is a clamp, which is composed of two arc-shaped clamp parts connected by fasteners, and the sides of the two arc-shaped fasteners facing each other are constructed as curved surfaces with the same outer diameter as the drill pipe body, and the connecting part is fixedly connected to the side of the clamp facing away from the curved surface.

[0019] Preferably, the rotation direction of the drill rod body is configured so that when the spiral hole-forming drill bit is drilling, the rotation direction of the drill rod body is in the same direction as the spiral direction of the spiral blade.

[0020] Beneficial effects of the embodiments of the present invention

[0021] The spiral drilling bit is suitable for soil containing soft soil layers. The arc-shaped guard plates are arranged in pairs and symmetrically installed on both sides of the drill rod body. The guard plate assembly can form a cylindrical surface when the drill rod body rotates, abutting the inner wall of the borehole, thereby providing effective support and protection during the drilling process, overcoming the problem that the hole diameter does not meet the design requirements due to the collapse of the hole wall. Furthermore, through the cooperation of the spiral blades, the mud residue scraped off by the arc-shaped guard plates can be sent out of the borehole through the spiral blades, overcoming the problem that the traditional long spiral grouting pile drill bit lacks a wall protection device during the drilling process, thereby effectively preventing the mud residue on the hole wall from mixing into the concrete, and ensuring the bearing capacity of the pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0023] Figure 2 It is a structural schematic diagram of the connection state of the guard plate assembly and the long spiral drill rod in an embodiment of the present utility model.

[0024] Among them: 100, long spiral drill rod; 110, drill rod body; 111, material channel; 120, spiral blade; 200, guard plate assembly; 210, arc-shaped guard plate; 211, first arc surface; 212, second arc surface; 213, conical structure; 220, fixing part; 230, connecting part; 240, corner arm reinforcement plate. DETAILED DESCRIPTION

[0025] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description created by the present application, unless otherwise specified, "multiple" means two or more.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0028] The technical solution of the present application is designed based on the presence of fluid plastic and / or soft plastic soil layers in the stratum and the use of a long spiral grouting pile drilling process. When fluid plastic and / or soft plastic soil layers exist in the bottom layer, the use of the existing long spiral grouting pile drilling process may cause mud residue from the hole wall to be mixed in during the later concrete spraying process, making it impossible for the pile body to reach the expected bearing capacity, and there will be areas in the pile body with poor pile forming effect. In addition, the hole wall of the formed channel may collapse before grouting, making it impossible for the steel cage to be placed below. When the hole wall collapses more seriously, it may also cause the drill rod to get stuck. Therefore, the applicant proposed the solution of the embodiment of the present utility model.

[0029] like Figures 1 to 2As shown. A preferred embodiment of the spiral drilling bit of the present application is suitable for use in soils containing fluid plastic and / or soft plastic layers, ensuring that long spiral grouted piles achieve excellent pile formation in such soils. The spiral drilling bit comprises a long spiral drill rod 100 and a guard plate assembly 200. Among them, the long spiral drill rod 100 includes a controlled rotating drill rod body 110 and a spiral blade 120. The interior of the drill rod body 110 is constructed with a through material channel 111 along its own axial direction. One end of the drill rod body 110 is connected to a shotcrete drill bit (not shown in the figure). The spiral blade 120 is fixed to the outer peripheral side of the drill rod body 110 in a spiral extension manner and extends from one end of the drill rod body 110 to the other end so that the spiral blade 120 rotates synchronously with the drill rod body 110. The first rotation direction of the drill rod body 110 is configured to be in the same direction as the spiral direction of the spiral blade 120, and the second rotation direction of the drill rod body 110 is configured to be opposite to the spiral direction of the spiral blade 120. When the drill rod body 110 rotates in the first rotation direction, the mud residue in the borehole can be discharged from the borehole through the spiral blade 120. The guard plate assembly 200 includes a pair of curved guard plates 210, a fixing member 220, and a connecting member 230. The pair of curved guard plates 210 are symmetrically arranged on both sides of the drill pipe body 110. The curved guard plates 210 are connected to the fixing member 220 via the connecting member 230, and the fixing member 220 is fixedly mounted on the outer side of the drill pipe body 110, so that the curved guard plates 210 rotate synchronously with the drill pipe body 110. The arc-shaped guard plate 210 forms a cylindrical surface on the side facing away from the drill rod body 110 during the rotation process, so as to provide temporary support to the hole wall during the drilling process of the drill bit. Moreover, as the spiral blade 120 completes the soil extraction, when the spiral drilling drill bit is lifted and the concrete is pressure-filled and sprayed, the cylindrical surface formed by the rotation of the arc-shaped guard plate 210 can expand the hole wall to the designed hole diameter before concrete spraying, so as to avoid the collapse of the hole and affect the quality of the pile, and maintain the inner diameter of the hole at the designed hole diameter during spraying. Moreover, the mud scraped off by the arc-shaped guard plate 210 can be sent out of the borehole by the rotating spiral blade 120 to reduce the content of mud mixed in the concrete slurry, thereby ensuring the quality of the pile.

[0030] like Figure 1Specifically, the drill rod body 110 includes a first sidewall that encloses a material channel 111 and a second sidewall that encloses an outer surface of the drill rod body 110. The drill rod body 110 also has a first end for mounting a shotcrete drill bit and a second end for connecting to an adjacent drill rod (not shown). When the cross section of the spiral blade 120 is viewed along a plane perpendicular to the axis of the drill rod body 110 and passing through the drill rod body 110, the spiral extension direction of the spiral blade 120 as it extends to the second end of the drill rod body 110 is the spiral direction of the spiral blade 120. It is understood that when the rotation direction of the drill rod body 110 is the same as the spiral direction of the spiral blade 120, the long auger drill rod 100 tends to move toward the soil when in contact with the soil. When the rotation direction of the drill rod body 110 is opposite to the spiral direction of the spiral blade 120, the long auger drill rod 100 tends to move away from the soil. Furthermore, after the shotcrete drill bit drills to the required depth, the long spiral drill rod 100 needs to be pulled upward, and during the pulling process, concrete slurry is injected into the borehole through the shotcrete drill bit. In the process of pulling the long spiral drill rod 100, the long spiral drill rod 100 needs to be continuously rotated, and the rotation direction of the long spiral drill rod 100 is in the same direction as the spiral direction, so that the mud residue falling from the hole wall can be discharged from the hole through the spiral blades 120.

[0031] In some embodiments, the spiral blade 120 is formed by connecting a number of coaxial spiral pieces end to end, with the pitches between adjacent spiral pieces being equidistant. In addition, the pitch size and spiral outer diameter of the spiral blade 120 should be determined according to the actual length of the drill pipe body 110.

[0032] like Figure 2Specifically, the arc-shaped guard plate 210 is formed by extending the first profile along the first direction. The arc-shaped guard plate 210 has a first end face and a second end face arranged in parallel in the first direction. The first end face is close to the first end of the drill rod body 110, and the second end face is close to the second end of the drill rod body 110. The first profile includes two concentric arcs and two side lines connecting the two ends of the two arcs respectively. The first direction is perpendicular to the plane where the first profile is located to form a structure similar to the shape of a tile. At this time, the outer side surface of the arc-shaped guard plate 210 is the first arc surface 211, and the inner side surface of the arc-shaped guard plate 210 is the second arc surface 212. The first arc surface 211 of the arc-shaped guard plate 210 corresponds to the arc with the larger diameter of the two arcs, and the second arc surface 212 of the arc-shaped guard plate 210 corresponds to the arc with the smaller diameter of the two arcs, so as to abut against the inner wall of the borehole, thereby ensuring that the inner diameter of the borehole is within the design diameter range while reducing the obstruction caused by the arc-shaped guard plate 210 to the drilling of the long spiral drill rod 100. It should be noted that when the arc guard plate 210 is fixedly connected to the outside of the drill rod body 110 through the connecting piece 230 and the fixing piece 220, the axis of the drill rod body 110 passes through the center of the circle corresponding to the first arc surface 211 and the center of the circle corresponding to the second arc surface 212 at the same time.

[0033] like Figure 2 Specifically, the connecting member 230 has two fixed ends, which are respectively fixedly connected to the inner side surface of the curved guard plate 210 and the side surface of the fixing member 220, thereby fixing the curved guard plate 210 to the drill rod body 110. In addition, the first direction should be parallel to the axial direction of the drill rod body 110, that is, the extension direction of the curved guard plate 210 is in the same direction as the axial direction of the drill rod body 110. In summary, the guard plate assembly 200 installs the two arc-shaped guard plates 210 on both sides of the drill rod body 110 in a symmetrical manner through the fixing parts 220 and the connecting parts 230, so that when the drill rod body 110 moves downward, the outer side of the arc-shaped guard plate 210 abuts against the hole wall, thereby achieving the effect of temporarily maintaining the hole wall. Moreover, after the grouting drill bit drills down to the desired position, during the lifting and concrete pressure grouting process, the arc-shaped guard plate 210 will first repair the inner wall of the channel during the upward pulling process, and the mud scraped off by the arc-shaped guard plate 210 will fall on the spiral blade 120 and be discharged from the channel as the spiral blade 120 rises, thereby ensuring that the inner diameter of the channel is basically maintained at the designed hole diameter when the concrete is sprayed.

[0034] like Figure 1In some embodiments, the curved guard plate 210 and the connecting member 230 are provided in a one-to-one correspondence, and the connecting member 230 is a bracket formed by splicing a plurality of rods. The connecting member 230 is fixedly connected to the second curved surface 212 of the curved guard plate 210. In addition, to increase the connection strength between the curved guard plate 210 and the connecting member 230, an axil reinforcement plate 240 can be welded at the connection between the connecting member 230 and the curved guard plate 210 to indirectly increase the connection area between the connecting member 230 and the curved guard plate 210, thereby reducing the probability of deformation or breaking of the connection between the connecting member 230 and the curved guard plate 210 during the rotation of the drill pipe body 110.

[0035] like Figure 2 As shown. In some embodiments, the fixing member 220 is a clamp, which is composed of two arc-shaped clamps connected by fasteners. The clamp is fixedly sleeved on the outer surface of the drill pipe body 110, and the two arc-shaped guard plates 210 are respectively connected to the corresponding arc-shaped members through corresponding connecting members 230. In other embodiments, the fixing member 220 is an oblique clamp, which is also composed of two arc-shaped members connected by fasteners. The two arc-shaped guard plates 210 are respectively connected to the corresponding arc-shaped members through corresponding connecting members 230. However, there is an angle between the plane where the oblique clamp is located and the axis of the drill pipe body 110. The direction and size of the angle should be the same as the direction and size of the angle between the spiral blade 120 and the axis of the drill pipe body 110.

[0036] like Figure 2 As shown. In some embodiments, the first end surface of the curved guard plate 210 extends toward the first end of the drill pipe body 110 and converges inward to form a tapered structure 213, further reducing the impact of the curved guard plate 210 on the drilling efficiency of the drill rig. In one embodiment, the tapered structure 213, when viewed from a longitudinal cross-section, is a rectangular profile extending toward the axis of the drill pipe body 110. The side of the rectangular profile close to the drill pipe body 110 corresponds to the inner side of the curved guard plate 210, and the side of the rectangular profile facing away from the drill pipe body 110 corresponds to the outer side of the curved guard plate 210. The extension line of the side of the rectangular profile corresponding to the inner or outer side of the curved guard plate 210 intersects the axis of the drill pipe body 110, and the angle between the two is less than two degrees, that is, the convergence angle of the tapered structure 213 is less than two degrees. It should be noted that the longitudinal cross-section is a plane passing through the axis of the drill pipe body 110, and this longitudinal cross-section intersects the curved guard plate 210 at right angles.

[0037] In one embodiment, the arc-shaped guard plate 210 is made of metal material and has a thickness of one centimeter. In addition, the distance between the inner side surface of the arc-shaped guard plate 210 and the edge of the spiral blade 120 should be less than one centimeter to avoid the hole diameter being too large, thereby ensuring that the amount of concrete used and the hole diameter of the drilled hole are within the design range.

[0038] The above contents described in this specification are merely examples of the present invention. Those skilled in the art of the present invention may make various modifications, additions, or substitute similar methods to the specific embodiments described, as long as they do not deviate from the contents of this specification or exceed the scope defined by the claims, and shall fall within the scope of protection of the present invention.

Claims

1. A spiral drilling bit suitable for soil with soft soil layers, characterized in that: include: Long auger rod, including: A drill rod body, wherein a through material channel is constructed inside the drill rod body along its own axial direction, and a shotcrete drill bit is provided at one end of the drill rod body; and A spiral blade is disposed around the outer circumference of the drill rod body in a spirally extending manner; Guard plate assembly, including: Arc-shaped guard plates, the arc-shaped guard plates being provided in pairs, the two arc-shaped guard plates being symmetrically provided on either side of the drill rod body so as to rotate with the drill rod body, the outer side surfaces of the arc-shaped guard plates being configured as first arc surfaces, the extension direction of the first arc surfaces being perpendicular to the axial direction of the drill rod body so as to form a cylindrical surface when the arc-shaped guard plates rotate with the drill rod body so as to abut against the inner wall of the borehole; and a fixing member fixedly disposed on the outside of the drill rod body; and The connecting piece is fixedly connected to the inner side surface of the arc-shaped guard plate and the surface of the fixing piece, so that the arc-shaped guard plate, the connecting piece and the fixing piece are connected as a whole.

2. The spiral drilling drill bit suitable for soil with soft soil layers according to claim 1, characterized in that: The inner side surface of the arc-shaped guard plate is constructed as a second arc surface, and the distance between the inner side surface of the arc-shaped guard plate and the edge of the spiral blade is less than 1 cm.

3. The spiral drilling drill bit suitable for soil with soft soil layers according to claim 2, characterized in that: The center of the circle corresponding to the first arc surface coincides with the center of the circle corresponding to the second arc surface, and the axis of the drill rod body passes through the center of the circle corresponding to the second arc surface.

4. The spiral drilling drill bit suitable for soil with soft soil layers according to claim 1, characterized in that: An angle armpit reinforcement plate is provided between the arc-shaped guard plate and the connecting piece.

5. The spiral drilling drill bit suitable for soil with soft soil layers according to claim 1, characterized in that: One end of the arc-shaped guard plate toward the shotcrete drill bit extends toward the drill rod body to form a conical structure, the conical structure converges toward the shotcrete drill bit, and the conical structure is constructed as a conical surface on the side away from the drill rod body.

6. The spiral drilling drill bit suitable for soil with soft soil layers according to claim 5, characterized in that: The convergence angle of the tapered structure should be less than 2°.

7. The spiral drilling drill bit suitable for soil with soft soil layers according to claim 1, characterized in that: The fixing part is a clamp, which is composed of two arc-shaped clamps connected by fasteners. The sides of the two arc-shaped fasteners facing each other are constructed as curved surfaces with the same outer diameter as the drill pipe body, and the connecting part is fixedly connected to the side of the clamp facing away from the curved surface.

8. A spiral drilling drill bit suitable for soil with soft soil layers according to any one of claims 1 to 7, characterized in that: The rotation direction of the drill rod body is configured so that when the spiral hole drilling bit is drilling, the rotation direction of the drill rod body is in the same direction as the spiral direction of the spiral blade.

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