Sealing device for joint of drilling rod of cast-in-situ bored pile

Abstract

The invention provides a cast-in-situ bored pile drill rod joint sealing device, which comprises a first drill rod joint, a second drill rod joint, a third drill rod joint and a fourth drill rod joint, the outer side of the tail end of a first drill rod is sleeved with the first drill rod joint, and a first annular groove is formed in the position, adjacent to the first drill rod, of the bottom surface of the first drill rod joint; the second drill rod connector is arranged on the outer side of the tail end of the second drill rod in a sleeving mode, and a second annular groove is formed in the position, adjacent to the second drill rod, of the bottom face of the second drill rod connector; the first rubber ring is embedded in the first annular groove; and the second rubber ring is embedded in the second annular groove, when the first drill rod connector and the second drill rod connector are in butt joint, the first drill rod and the second drill rod are in vertical coaxial butt joint, and the first rubber ring and the second rubber ring are in coupling butt joint. The rubber rings are arranged on the bottom faces of the two drill rod connectors, so that the sealing performance of the butt joint position is improved when the two drill rod connectors are in butt joint, slurry leakage is avoided, and the forward (reverse) circulation hole cleaning effect and the circulation slurry utilization rate are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a sealing device for a bored pile drill rod connection. Background Art

[0002] Ultra-deep bored piles refer to bored piles with a depth exceeding a certain standard. This standard varies depending on the region and project requirements, but generally refers to piles with a depth exceeding 60m or even 100m. There are many key points in quality control and high construction requirements. During the drilling process, the stability and performance of the mud are crucial. It is necessary to prevent the mud from stratification and sedimentation and maintain its suspension. After drilling, impurities in the hole need to be removed to ensure the quality of concrete pouring.

[0003] During the drilling process, the circulating slurry forms a mud skin on the hole wall and adheres to the hole wall, which plays a role in protecting the hole wall and preventing the hole wall from collapsing. Through the circulating flow, it can carry and discharge the drill cuttings generated during the drilling process and keep the bottom of the hole clean. This is very critical to ensure the quality of the pile foundation and construction safety. Hole cleaning is a key step to ensure the quality of the pile foundation. The current mainstream method is the slurry extraction method, including positive circulation and reverse circulation. However, during the hole cleaning process, there is a phenomenon of slurry leakage at the connection of the drill rod of the bored pile, which affects the positive (reverse) circulation hole cleaning effect and reduces the utilization rate of the circulating slurry.

[0004] In view of the problem that slurry leakage occurs at the connection of the drill rod of bored piles during the existing hole cleaning process, which affects the positive (reverse) circulation hole cleaning effect and the utilization rate of the circulating slurry, technical personnel in this field have been looking for solutions. Summary of the invention

[0005] The purpose of the present invention is to provide a bored pile drill rod connection sealing device to solve the problem of slurry leakage at the bored pile drill rod connection during the existing hole cleaning process, which affects the positive (reverse) circulation hole cleaning effect and the utilization rate of the circulating slurry.

[0006] In order to solve the above technical problems, the present invention provides a bored pile drill rod connection sealing device, the bored pile drill rod connection sealing device comprising:

[0007] A first drill rod joint is sleeved on the outer side of the end of the first drill rod, and a first annular groove is formed on the bottom surface of the first drill rod joint at a position adjacent to the first drill rod;

[0008] The second drill rod joint is sleeved on the outer side of the end of the second drill rod, and the bottom surface of the second drill rod joint is provided with a second annular groove at a position adjacent to the second drill rod;

[0009] A first rubber ring, embedded in the first annular groove;

[0010] The second rubber ring is embedded in the second annular groove. When the first drill rod joint is butted with the second drill rod joint, the first drill rod and the second drill rod are butted vertically and coaxially, and the first rubber ring is butted with the second rubber ring in coupling.

[0011] Optionally, the sealing device for the bored pile drill rod connection further includes: a plurality of drill rod joint connecting assemblies, through which the first drill rod joint and the second drill rod joint are connected by the drill rod joint connecting assemblies to penetrate the screw holes connecting the two after the two are docked, so as to fasten the first drill rod joint and the second drill rod joint.

[0012] Optionally, in the drilling pile drill rod connection sealing device, each drill rod joint connection assembly includes: a bolt, a fastening nut and a slotted nut matching the bolt, and a cotter pin matching the slotted nut.

[0013] Optionally, in the sealing device for the bored pile drill rod connection, the bolts include: fixing bolts and anti-torsion bolts, the specifications of the fixing bolts are larger than the anti-torsion bolts; and the strength of the anti-torsion bolts is greater than that of the fixing bolts.

[0014] Optionally, in the sealing device for the bored pile drill rod connection, the anti-torsion bolt is a high-strength bolt.

[0015] Optionally, in the sealing device for the bored pile drill rod connection, the bolt is a hexagonal bolt.

[0016] Optionally, in the sealing device for the bored pile drill rod connection, the first drill rod joint includes: a first flange and a plurality of first screw holes opened on the first flange, and all the first screw holes are located outside the first annular groove.

[0017] Optionally, in the sealing device for the bored pile drill rod connection, the second drill rod joint includes: a second flange, a plurality of grooves opened on one side of the second flange and capable of accommodating bolt heads, and a plurality of second screw holes correspondingly opened on the other side of the second flange and connected to the grooves, and all the second screw holes are located on the outside of the first annular groove.

[0018] Optionally, in the bored pile drill rod connection sealing device, the first rubber ring includes: a body and strip patterns arranged on the body.

[0019] Optionally, in the bored pile drill rod connection sealing device, the second rubber ring includes: a main body and strip patterns arranged on the main body.

[0020] In the bored cast-in-place pile drill pipe connection sealing device provided by the present invention, the bored cast-in-place pile drill pipe connection sealing device includes: a first drill pipe joint, which is sleeved on the outside of the end of the first drill pipe, and the bottom surface of the first drill pipe joint is provided with a first annular groove at a position adjacent to the first drill pipe; a second drill pipe joint, which is sleeved on the outside of the end of the second drill pipe, and the bottom surface of the second drill pipe joint is provided with a second annular groove at a position adjacent to the second drill pipe; a first rubber ring, which is embedded in the first annular groove; a second rubber ring, which is embedded in the second annular groove, when the first drill pipe joint is docked with the second drill pipe joint, the first drill pipe and the second drill pipe are vertically coaxially docked, and the first rubber ring is coupled with the second rubber ring. By arranging rubber rings on the bottom surfaces of the two drill pipe connectors, the sealing of the docking position is increased when the two drill pipe joints are docked, and slurry leakage is avoided, thereby effectively improving the positive (reverse) circulation hole cleaning effect and the utilization rate of the circulating slurry.

[0021] On the other hand, by providing a drill rod joint connection assembly, the first drill rod joint and the second drill rod joint are tightened after docking to prevent the drill rod connection from loosening, thereby further ensuring the sealing effect of the drill rod connection.

[0022] On the other hand, by structurally designing the second drill pipe joint, one side of the joint is designed to be provided with a groove for accommodating the bolt head. Based on the restriction of the groove on the bolt head, the subsequent tightening of the nut matching the bolt can effectively prevent the problem of the bolt not being able to be tightened due to the thread head rotating with the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0024] Figure 1 is a longitudinal cross-sectional view of two drill rods before connection in one embodiment of the present invention;

[0025] Figure 2 is a longitudinal cross-sectional view of two drill rods connected in one embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of the bottom surface of the second drill rod joint in one embodiment of the present invention;

[0027] Figure 4 is a schematic diagram of the drill pipe side of the second drill pipe joint in one embodiment of the present invention;

[0028] Figure 5 is a schematic diagram of the structure of the first rubber ring or the second rubber ring in one embodiment of the present invention;

[0029] Figure 6is a longitudinal cross-sectional view of a first rubber ring and a second rubber ring when they are coupled and docked in one embodiment of the present invention;

[0030] Figure 7 It is a structural schematic diagram of a drill pipe joint connection assembly in one embodiment of the present invention.

[0031] In the figure:

[0032] 100-first drill pipe;

[0033] 100'-second drill pipe;

[0034] 1-first drill pipe joint; 11-first annular groove; 12-first rubber ring; 13-first flange; 14-first screw hole;

[0035] 1'-second drill pipe joint; 11'-second annular groove; 12'-second rubber ring; 13'-second flange; 14'-second screw hole; 15'-groove;

[0036] 2-drill pipe joint connection assembly; 21-bolt; 22-fastening nut; 23-slotted nut; 24-cotter pin. DETAILED DESCRIPTION

[0037] The following is a further detailed description of the bored pile drill rod connection sealing device proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the accompanying drawings are in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0038] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0039] In the description of the invention, it is necessary to understand that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention 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 a limitation on the invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to the specific circumstances.

[0042] Please refer to Figure 1 and Figure 2 The sealing device for the connection of bored pile drill rods comprises: a first drill rod joint 1, a second drill rod joint 1', a first rubber ring 12 and a second rubber ring 12', the first drill rod joint 1 is sleeved on the outer side of the end of the first drill rod 100, and the bottom surface of the first drill rod joint 1 is provided with a first annular groove 11 at a position adjacent to the first drill rod 100; the second drill rod joint 1' is sleeved on the outer side of the end of the second drill rod 100', and the bottom surface of the second drill rod joint 1' is provided with a second annular groove 11' at a position adjacent to the second drill rod 100'; the first rubber ring 12 is embedded in the first annular groove 11; the second rubber ring 12' is embedded in the second annular groove 11', when the first drill rod joint 1 is butted with the second drill rod 100 and the second drill rod 100' are vertically coaxially butted, and the first rubber ring 12 is coupled and butted with the second rubber ring 12' (specifically as Figure 6 The first rubber ring 12 and the second rubber ring 12' are respectively adhered to the first annular groove 11 and the second annular groove 11' by using a special adhesive.

[0043] The present invention arranges rubber rings on the bottom surfaces of two drill rod connectors so as to increase the sealing performance of the butt joint position when the two drill rod connectors are butt jointed, thereby avoiding the problem of slurry leakage.

[0044] Please refer to Figure 5In this embodiment, the first rubber ring 12 includes: a body and strips arranged on the body; the second rubber ring 12' includes: a body and strips arranged on the body. The strips on the first rubber ring 12 and the strips on the second rubber ring 12' are staggered to achieve mutual coupling and docking. By relying on the pressure when the drill rod joint is docked, two layers of dense rubber layers that bite each other can be formed, which increases the sealing of the docking position of the two drill rod joints and avoids the problem of slurry leakage.

[0045] For further information, please refer to Figure 1 The first drill pipe joint 1 includes: a first flange 13 and a plurality of first screw holes 14 opened on the first flange 13 , and all the first screw holes 14 are located outside the first annular groove 11 .

[0046] For further information, please refer to Figure 3 and Figure 4 The second drill pipe joint 1' comprises: a second flange 13', a plurality of grooves 15' opened on one side of the second flange 13' and capable of accommodating the heads of the bolts 21, and a plurality of second screw holes 14' correspondingly opened on the other side of the second flange 13' and connected with the grooves 15', and all the second screw holes 14' are located outside the first annular groove 11. The first flange 13 is sleeved on the outside of the end of the first drill pipe 100; the second flange 13' is sleeved on the outside of the end of the second drill pipe 100', and the second flange 13' and the first flange 13 are different in structure, the difference is: the first flange 13 surface does not have a groove 15'; while the first flange 13 surface has a groove 15' to provide an installation point for the bolts 21.

[0047] Please refer to Figure 1 , Figure 2 and Figure 7 , a plurality of drill rod joint connection components 2 are provided, through which the first drill rod joint 1 and the second drill rod joint 1' are connected by the drill rod joint connection components 2, and the first drill rod joint 1 and the second drill rod joint 1' are fastened. By providing the drill rod joint connection components 2, the first drill rod joint 1 and the second drill rod joint 1' after the connection are fastened, loosening of the drill rod connection is avoided, and the sealing effect of the drill rod connection is further guaranteed.

[0048] Specifically, each drill pipe joint connection assembly 2 includes: a bolt 21, a fastening nut 22 and a slotted nut 23 matched with the bolt 21, and a split pin 24 matched with the slotted nut 23. Among them, the fastening nut 22 is a common nut, which is responsible for tightening and fixing the bolt 21 on the first drill pipe joint 1, and the slotted nut 23 is used for sealing the head, and is fixed with the split pin 24 after tightening to prevent the nut from loosening.

[0049] Specifically, the bolts 21 include: a fixing bolt 21 and an anti-torsion bolt 21, the specification of the fixing bolt 21 is larger than the anti-torsion bolt 21; the strength of the anti-torsion bolt 21 is larger than the fixing bolt 21. In this embodiment, the anti-torsion bolt 21 is a high-strength bolt 21; the fixing bolt 21 is an ordinary bolt 21. The bolt 21 is preferably a hexagonal bolt 21, and accordingly, the groove 15' provided on the second flange 13' is a hexagonal groove 15'. It can be understood that the bolt 21 includes but is not limited to the hexagonal bolt 21, and can also be a pentagonal bolt 21.

[0050] The fixing bolt 21 and the anti-torsion bolt 21 have the same structure, but the difference lies in strength and specification. The fixing bolt 21 adopts an ordinary bolt 21, which has a larger specification and mainly functions to transmit shear force when connecting the drill rod, so as to achieve the purpose of fixed connection; the anti-torsion bolt 21 adopts a high-strength bolt 21, which has a smaller specification and mainly functions to provide sufficient strength for the connection during the rotary drilling of the drill rod, so as to prevent the connection between the drill rod and the connecting rod from being loose or even broken due to insufficient strength.

[0051] Please refer to Figure 3 and Figure 4 The larger structure in the figure corresponds to the fixing bolt 21, and the smaller structure corresponds to the anti-torsion bolt 21. In this embodiment, only two anti-torsion bolts 21 need to be installed on the diameter of the second flange 13' to meet the requirement of providing sufficient strength for the connection during the rotary drilling of the drill pipe.

[0052] Please refer to Figure 1 and Figure 2 The specific process of docking the first drill pipe joint with the second drill pipe joint is as follows:

[0053] like Figure 2 As shown, when the first drill rod joint 1 and the second drill rod joint 1' are butted, the two are coaxial, the bottom surface of the first drill rod joint 1 is butted with the bottom surface of the second drill rod joint 1', the first screw hole 14 on the first flange 13 is correspondingly connected with the second screw hole 14' on the second flange 13', and a drill rod joint connection assembly 2 is installed on each of the correspondingly connected screw holes. During the installation process of the drill rod joint connection assembly 2, as the bolts 21 are gradually tightened, the gap between the first drill rod joint 1 and the second drill rod joint 1' becomes smaller and smaller, and the first rubber ring 12 of the first drill rod joint 1 and the second rubber ring 12' of the second drill rod joint 1' are engaged with each other, and based on the particularity of rubber, a dense Figure 6 At the same time as the bite layer shown, the first drill rod joint 1 and the second drill rod joint 1' are also tightly fitted as shown in FIG. Figure 2 , which can ensure that the friction between the drill pipe joints remains effective during the drilling process.

[0054] The installation process of each drill pipe joint connection assembly 2 is as follows:

[0055] The bolt 21 is passed through the groove 15', the second screw hole 14' and the first screw hole 14 on the first flange 13 in sequence. At this time, the head of the bolt 21 is embedded in the groove 15'. The end of the bolt 21 passing through the first screw hole 14 is fastened with the fastening nut 22 and the slotted nut 23 in sequence, and then the slotted nut 23 is fixed with the cotter pin 24.

[0056] The present invention has the following advantages:

[0057] 1) By setting a rubber ring on the bottom surface of the two drill pipe joints, the sealing of the butt joint position can be increased when the two drill pipe joints are butt jointed to avoid slurry leakage, thereby effectively improving the positive (reverse) circulation hole cleaning effect and the utilization rate of the circulating slurry.

[0058] 2) By setting a drill pipe joint connection assembly, the first drill pipe joint and the second drill pipe joint after docking are tightened to prevent the drill pipe connection from loosening, thereby further ensuring the sealing effect of the drill pipe connection.

[0059] 3) By structurally designing the second drill pipe joint, one side of the joint is provided with a groove for accommodating the bolt head. Based on the restriction of the bolt head by the groove, the problem of the bolt not being able to be tightened due to the thread head rotating with the nut can be effectively prevented during the subsequent tightening of the nut matching the bolt.

[0060] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A sealing device for the connection of bored pile drill rods, characterized in that: include: A first drill rod joint is sleeved on the outer side of the end of the first drill rod, and a first annular groove is formed on the bottom surface of the first drill rod joint at a position adjacent to the first drill rod; The second drill rod joint is sleeved on the outer side of the end of the second drill rod, and the bottom surface of the second drill rod joint is provided with a second annular groove at a position adjacent to the second drill rod; A first rubber ring, embedded in the first annular groove; The second rubber ring is embedded in the second annular groove. When the first drill rod joint is butted with the second drill rod joint, the first drill rod and the second drill rod are butted vertically and coaxially, and the first rubber ring is butted with the second rubber ring in coupling.

2. The bored pile drill rod connection sealing device according to claim 1, characterized in that: Also includes: A plurality of drill rod joint connection assemblies are used to fasten the first drill rod joint and the second drill rod joint by penetrating screw holes connected to the first drill rod joint and the second drill rod joint after the two are butt-jointed.

3. The bored pile drill rod connection sealing device according to claim 2, characterized in that: Each drill pipe joint connection assembly comprises: a bolt, a fastening nut and a slotted nut matched with the bolt, and a split pin matched with the slotted nut.

4. The bored pile drill rod connection sealing device as claimed in claim 3, characterized in that: The bolts include: a fixing bolt and an anti-torsion bolt, the specification of the fixing bolt is larger than that of the anti-torsion bolt; the strength of the anti-torsion bolt is greater than that of the fixing bolt.

5. The bored pile drill rod connection sealing device according to claim 4, characterized in that: The anti-torsion bolts are high-strength bolts.

6. The bored pile drill rod connection sealing device according to claim 4, characterized in that: The bolts are hexagonal bolts.

7. The bored pile drill rod connection sealing device according to claim 2, characterized in that: The first drill pipe joint comprises: a first flange and a plurality of first screw holes opened on the first flange, and all the first screw holes are located outside the first annular groove.

8. The bored pile drill rod connection sealing device according to claim 7, characterized in that: The second drill pipe joint includes: a second flange, a plurality of grooves opened on one side of the second flange and capable of accommodating bolt heads, and a plurality of second screw holes correspondingly opened on the other side of the second flange and connected to the grooves, and all the second screw holes are located outside the first annular groove.

9. The bored pile drill rod connection sealing device according to claim 1, characterized in that: The first rubber ring includes: a body and strip patterns arranged on the body.

10. The bored pile drill rod connection sealing device according to claim 9, characterized in that: The second rubber ring includes: a body and strip patterns arranged on the body.

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