A kind of overhole support device for reverse circulation drilling construction

Abstract

The utility model provides a kind of for uphole drilling construction's raise support device, it is related to uphole drilling construction technical field, mainly for solving the problem that uphole drilling construction cannot be drilled and supported simultaneously in prior art.The raise support device of the utility model is coaxially connected with drag shaft in the lower end of uphole drilling cutter, and support template is coaxially connected with the lower end of drag shaft through thrust bearing, annular concrete pouring area is formed between support template and raise wall, and pouring pipe for pouring concrete is arranged in the upper portion of support template.The utility model is pulled to support template by the help of the tunneling power of uphole drilling, so that support template can continuously pour concrete, and form raise support.The utility model does not need personnel to participate, and raise can be supported while uphole drilling is tunneling, to avoid collapse of raise due to untimely support.

Description

Technical Field

[0001] This utility model is specifically a riser support device for reverse drilling construction, and relates to the field of reverse drilling construction technology. Background Technology

[0002] Raise-the-well rigs, as advanced equipment for constructing vertical and inclined shafts, are widely used in metal mining. Using raise-the-well drilling for shaft construction not only improves construction efficiency and safety but also reduces labor intensity and costs.

[0003] Currently, due to falling debris during reverse drilling, personnel cannot enter the shaft for support work. Therefore, support can only be provided after the shaft has been excavated. While this is manageable for vertical shafts, inclined shafts are highly susceptible to collapse if not supported promptly, especially in unstable geological conditions. Therefore, there is a need to develop a support device that allows for simultaneous drilling and support. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model discloses a riser support device for reverse drilling operations, adopting the following technical solution: A riser support device for reverse drilling construction includes a drive shaft coaxially connected to the lower end of the cutterhead of the reverse drilling machine, and a support template coaxially connected to the lower end of the drive shaft via a thrust bearing. An annular concrete pouring area is formed between the support template and the riser wall, and a pouring pipe for pouring concrete is provided on the upper part of the support template.

[0005] Further improve the technical solution: A flared end is provided at the upper end of the support template, and the flared end fits into the well wall.

[0006] Further improvement of the technical solution: There are multiple casting pipes, which are evenly distributed along the circumference of the support template.

[0007] Further improvements to the technical solution: A vibrator for compacting concrete is also installed on the upper part of the support formwork.

[0008] Further improvement of the technical solution: There are multiple vibrating rods, which are evenly distributed along the circumference of the support template.

[0009] Further improve the technical solution: A bearing seat for installing a thrust bearing is set in the center of the support template, and the bearing seat is connected to the support template through a spoke plate.

[0010] After implementing the above technical solution, the beneficial effects of this utility model compared to the prior art are: The support template of this utility model is set at the lower end of the riser cutterhead. The riser's drilling power is used to pull the support template, so that concrete can be continuously poured into the support template to form a well support.

[0011] This invention requires no human intervention and can support the wellhead during reverse drilling, preventing the wellhead from collapsing due to untimely support. Attached Figure Description

[0012] Appendix Figure 1 The diagram shown is a cross-sectional structural schematic of the well support device.

[0013] Appendix Figure 2 The attached image shows the attached image. Figure 1 Cross-sectional view of AA.

[0014] Appendix Figure 3 The diagram shown is a schematic diagram of the operation of this well support device.

[0015] In the attached diagram: 1. Raised well cutterhead; 2. Drive shaft; 3. Thrust bearing; 4. Bearing housing; 5. Spoke plate; 6. Support template; 7. Casting pipe; 8. Vibrator. Detailed Implementation

[0016] The preferred embodiments of this utility model are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of this utility model and are not intended to limit the scope of protection of this utility model. It should be noted that in the description of this utility model, terms such as "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or element must have a specific orientation and positional relationship, and therefore should not be construed as a limitation of this utility model. It should also be noted that in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0017] A riser support device for reverse drilling construction relates to the field of reverse drilling construction technology, and is mainly used to solve the problem that reverse drilling construction cannot be supported while drilling in the prior art. The composition structure and working process of this utility model are described in detail below.

[0018] See attached document Figure 1 and attached Figure 2The well support device of this utility model mainly consists of a drive shaft 2, a support template 6, a pouring pipe 7, and a vibrator 8. The drive shaft 2 is coaxially connected to the lower end of the riser cutterhead 1 by bolts. At the lower end of the drive shaft 2, the support template 6 is coaxially connected to the support shaft 6 by a thrust bearing 3. The support template 6 is used for pouring concrete for well support.

[0019] Specifically, a bearing seat 4 is installed at the center of the support template 6, and a pair of spokes symmetrically arranged in the radial direction of the bearing seat 4. The bearing seat 4 is connected to the support template 6 through the spokes 5. A thrust bearing 3 is installed between the bearing seat 4 and the drive shaft 2. During raise boring, the raise drill bit 1 rotates and feeds upward under the drive of the drilling rig, cutting the rock. Because a thrust bearing 3 is installed between the bearing seat 4 and the drive shaft 2, the support template 6 does not rotate much when the drive shaft 2 rotates with the raise drill bit 1; it only moves upward under the drag of the drive shaft 2.

[0020] The support formwork 6 of the wellhead is cylindrical. During the raise boring operation, the crushed stone cut by the raise boring cutter 1 falls from the support formwork 6, forming a ring-shaped concrete pouring area between the support formwork 6 and the wellhead wall. To prevent the crushed stone cut by the raise boring cutter 1 from falling into the concrete pouring area, a flared end is provided at the upper end of the support formwork 6. The flared end fits snugly against the wellhead wall. The flared end structure has two functions: first, it prevents the crushed stone from falling into the concrete pouring area; second, it guides the support formwork 6.

[0021] Three pouring pipes 7 are installed on the upper part of the support formwork 6, and the three pouring pipes 7 are evenly distributed along the circumference of the support formwork 6 for uniformly pouring concrete into the concrete pouring area. In addition, three vibrators 8 are also installed on the upper part of the support formwork 6, and the three vibrators 8 are evenly distributed along the circumference of the support formwork 6 for uniformly vibrating and compacting the concrete in the concrete pouring area.

[0022] Work Process: The raise boring machine employs an intermittent construction method, using high-strength, quick-drying cement. When the raise boring machine cutterhead 1 has advanced to a certain height, a ring-shaped concrete pouring area is formed between the support formwork 6 and the shaft wall. At this point, the raise boring machine stops advancing, and then concrete is poured evenly into the concrete pouring area through three pouring pipes 7. After pouring, three vibrators 8 are turned on to evenly compact the concrete, as shown in the attached diagram. Figure 1 As shown.

[0023] See attached document Figure 3 After the concrete begins to solidify (generally after 3-5 hours), the drilling rig is started to continue excavation. At this time, the support formwork 6 continues to move upward under the drag of the drive shaft 2, forming a new concrete pouring area while the lower part of the support formwork 6 continues to support the not-yet-fully-solidified concrete pouring area. This cycle is repeated, thus achieving simultaneous excavation and support, preventing the shaft from collapsing due to untimely support.

[0024] It is worth noting that the content not described in detail in the above embodiments is prior art. It is also worth noting that any additions, subtractions, substitutions, and improvements made by those skilled in the art based on the structure and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A riser support device for riser drilling operations, characterized in that: A drive shaft is coaxially connected to the lower end of the cutterhead of the reverse drilling machine. A support template is coaxially connected to the lower end of the drive shaft via a thrust bearing. A ring-shaped concrete pouring area is formed between the support template and the well wall. A pouring pipe for pouring concrete is installed on the upper part of the support template.

2. The riser support device for raised drilling construction as described in claim 1, characterized in that: An flared section is provided at the upper end of the support formwork, and the flared section fits into the well wall.

3. A riser support device for raised drilling operations as described in claim 1, characterized in that: The casting pipes are multiple, and the multiple casting pipes are evenly distributed along the circumference of the support template.

4. A riser support device for raised drilling operations as described in claim 1, characterized in that: A vibrator for compacting concrete is also installed on the upper part of the support formwork.

5. A riser support device for raised drilling operations as described in claim 4, characterized in that: The vibrating rods are multiple in number and are evenly distributed along the circumference of the support template.

6. A riser support device for raised drilling operations as described in claim 1, characterized in that: A bearing housing for installing a thrust bearing is set in the center of the support template, and the bearing housing is connected to the support template through a spoke plate.

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