Punching-free fast-installation grouting advanced small guide pipe

Abstract

The utility model discloses a drilling-free fast-installed advanced small guide pipe, and belongs to the technical field of coal mine and tunnel supporting. Comprising a drill rod body, an extension rod body, an anti-backflow valve and a quick connector, the drill rod body is connected with the extension rod body through threads, the extension rod body is connected with the anti-backflow valve through threads, the anti-backflow valve is connected with the quick connector in a clamped mode, and the drill rod body and the extension rod body are each provided with a multi-ring disconnected type rock debris guiding-out spiral to form a slurry guiding channel so that slurry can be evenly guided; the drill rod body and the extension rod body are each provided with a grouting hole, the backflow prevention valve is provided with a backflow prevention valve switch, an inner groove and a sealing ring, and the quick connector is provided with an annular protrusion. The drilling and grouting functions are integrated, the hole collapse problem is avoided, the supporting strength is improved through the backflow prevention design, the modular connection adapts to different depth requirements, the construction process is simplified, the broken type rock debris guide-out spiral has the debris removal and grout guide functions, and the construction efficiency and safety are improved.

Description

Technical Field

[0001] This utility model relates to the field of support technology in coal mining and tunnel construction, and in particular to an advanced small guide pipe that can be quickly installed for grouting, requires no drilling and prevents backflow, suitable for advanced support and grouting reinforcement operations in loose coal or rock masses. Background Technology

[0002] In coal mining, drilling and support operations often face severe challenges when dealing with extremely loose coal seams. Extremely loose coal seams typically have a loose structure, poor cementation, weak self-stabilizing ability, and are easily softened by water, making them highly prone to collapse. This leads to frequent problems during drilling, such as borehole wall collapse, borehole enlargement, and drill bit jamming. This not only reduces drilling efficiency but also increases construction difficulty.

[0003] Existing technologies include the use of small guide pipes for pre-support, but the installation of traditional small guide pipes faces the following problems when performing pre-support in loose coal seams or extremely unstable rock formations:

[0004] 1. Borehole collapse: Loose coal seams have poor cementation, making the borehole wall prone to collapse after drilling, which can prevent the proper installation or placement of small guide pipes. Furthermore, borehole wall collapse can cause the small guide pipes to shift, further affecting the overall stability and safety of the support structure.

[0005] 2. Grouting backflow: Due to the high porosity of coal, the grout tends to flow back along the boreholes or fissures during grouting, making it difficult to form an effective solidified body and causing material waste.

[0006] 3. Void formation: After the grout flows back, voids are easily generated inside the small guide pipes, which reduces the support strength and affects the construction quality.

[0007] In summary, existing technologies typically require drilling before installing the small guide pipe, but this process is prone to borehole collapse and lacks effective backflow prevention measures. Therefore, there is an urgent need for an advanced small guide pipe structure that can directly drill into the rock mass without drilling and prevent slurry backflow. Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an advanced small guide pipe that can be quickly installed for grouting, requires no drilling, and prevents backflow, so as to solve the technical problems of hole collapse, grout backflow and void formation in loose coal bodies.

[0009] The technical solution of this utility model is as follows:

[0010] A pre-installed small guide pipe for rapid installation of grouting without drilling, comprising:

[0011] The drill rod body has a tapered drill bit at the first end and a threaded connection at the second end. The surface of the drill rod body is provided with multiple grouting holes and a multi-ring disconnected cuttings discharge spiral. Each ring of the disconnected cuttings discharge spiral is disconnected in the circumferential direction, and one or more grouting channels are formed at the disconnection point.

[0012] The extension rod has threaded connection parts at both ends. The threaded connection part at the first end is used to connect with the threaded connection part at the second end of the drill rod body. The threaded connection part at the second end is used to connect with the drilling rig during drilling. The surface of the extension rod body is provided with multiple grouting holes and a multi-ring disconnected cuttings discharge spiral.

[0013] An anti-backflow valve, wherein the first end of the anti-backflow valve is provided with a threaded connection part for connecting with the threaded connection part of the second end of the extension rod after drilling to a predetermined depth, and the second end is provided with a snap-fit ​​connection part;

[0014] The quick connector has a snap-fit ​​connection at its first end for connecting with the snap-fit ​​connection at the second end of the anti-backflow valve, and a threaded connection at its second end for connecting with the grouting pipe so that grouting can be performed after drilling to a predetermined depth.

[0015] In some embodiments, the threaded connection portion at the second end of the drill rod body is an internal thread, and the threaded connection portion at the first end of the extension rod body is an external thread, wherein the internal thread and the external thread are adapted to form a threaded connection.

[0016] In some embodiments, the threaded connection at the second end of the extension rod is an internal thread, and the threaded connection at the first end of the anti-backflow valve is an external thread, wherein the internal thread and the external thread are adapted to form a threaded connection.

[0017] In some embodiments, the anti-backflow valve is provided with an anti-backflow valve switch.

[0018] In some embodiments, the snap-fit ​​connection portion at the second end of the anti-backflow valve is provided with an internal groove, and the snap-fit ​​connection portion at the first end of the quick connector is a circumferential protrusion. The internal groove and the circumferential protrusion are adapted to form a snap-fit ​​connection.

[0019] In some embodiments, the snap-fit ​​connection at the second end of the anti-backflow valve further includes a sealing ring to form a seal at the joint, thereby preventing slurry leakage.

[0020] In some embodiments, the threaded connection portion at the second end of the quick connector is an external thread, which is adapted to the grouting pipe to form a threaded connection.

[0021] In some embodiments, the multi-ringed disconnected cuttings extraction spirals are distributed at equal intervals along the axial direction of the rod.

[0022] In some embodiments, the grouting holes are distributed in a diamond pattern along the axial direction of the rod. During the grouting process, the grout overflows from the grouting holes and flows into each other along the axial direction of the rod through the grout guiding channel to form a uniformly distributed solidified material.

[0023] In some embodiments, the drill pipe body is a hollow steel pipe with a length of 1500mm and a diameter of 42mm;

[0024] The extension rod is a hollow steel tube, 1500mm in length and 42mm in diameter.

[0025] The advantages of this utility model over the prior art are:

[0026] 1. Drilling directly into the rock mass using a conical drill bit avoids the problem of hole collapse caused by pre-drilling, thus improving installation efficiency.

[0027] 2. By extending a predetermined number of extension rods, repeat this process to the designed length, suitable for support to different design depths.

[0028] 3. The grouting channel formed at the break of the multi-ring disconnected rock cuttings guide spiral cooperates with the grouting hole, so that the grout flows through the grouting channel along the axis of the rod during grouting, forming a uniformly distributed solidified body.

[0029] 4. The anti-backflow valve, in conjunction with the quick-connect fitting, effectively prevents grout backflow, ensuring grout compactness and eliminating voids.

[0030] It should be understood that the implementation of any embodiment of this utility model does not mean that it will simultaneously possess or achieve multiple or all of the above-mentioned beneficial effects. Attached Figure Description

[0031] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0032] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0033] Figure 1A schematic diagram of the overall structure of the advanced small guide tube that can be quickly installed for grouting without drilling, provided in an embodiment of this utility model;

[0034] Figure 2 This is a schematic diagram of the drill pipe body structure provided in an embodiment of the present utility model;

[0035] Figure 3 This is a schematic diagram of the extension rod structure provided in an embodiment of the present utility model;

[0036] Figure 4 This is a schematic diagram of the anti-backflow valve structure provided in an embodiment of the present utility model;

[0037] Figure 5 This is a schematic diagram of the quick connector structure provided in an embodiment of the present utility model;

[0038] Marked in the image:

[0039] 1-Drill rod body; 2-Extension rod body; 3-Anti-backflow valve; 4-Quick connector; 5-Conical drill bit; 6-Grouting hole; 7-Anti-backflow valve switch; 8-Internal groove; 9-Sealing ring; 10-Circumferential protrusion; 11-Disconnectable cuttings discharge spiral; 12-Grouting channel; 13-Threaded connection.

[0040] The same or corresponding marks in the diagram indicate the same or corresponding parts. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of this utility model and their descriptions are used to explain this utility model, but are not intended to limit this utility model.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between 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.

[0043] It should be understood that the terms "comprising / including," "consisting of," or any other variations are intended to cover non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements includes not only those elements but may also include, where necessary, other elements not expressly listed, or elements inherent to such a product, apparatus, process, or method. Without further limitation, an element defined by the phrases "comprising / including," "consisting of," does not exclude the presence of additional identical elements in the product, apparatus, process, or method that includes said element.

[0044] It should also be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device, component or structure referred to must have a specific orientation, be constructed or operated in a specific orientation, and should not be construed as a limitation on this utility model.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] This utility model relates to the field of support technology in coal mining and tunnel construction, and particularly to an advanced small guide pipe that allows for rapid installation of grouting, eliminates the need for drilling, and prevents backflow. Figure 1-5 As shown, this utility model adopts a segmented drill rod body 1 and extension rod body 2 combined with an anti-backflow valve 3 and quick connector 4. After being processed in the factory, it is transported to the site for installation. The segmented structure facilitates processing, manufacturing, transportation, and installation. On-site, the extension rod body 2 can be flexibly lengthened according to the support depth. The grouting holes 6 on the surface of the drill rod body 1 are used in combination with the discontinuous rock cuttings guide spiral 11 to ensure sufficient and uniform grouting around the rod body, preventing excessive local grouting or the formation of local voids. The anti-backflow valve 3 can prevent the grout from flowing back along the guide pipe after grouting, which can solve the problem of the advanced small guide pipe in the prior art and ensure the overall stability and safety of the support structure.

[0047] The present invention will now be described in detail with reference to preferred embodiments.

[0048] This utility model provides an advanced small guide tube that can be quickly installed for grouting without backflow, such as... Figure 1As shown, the advanced small guide tube mainly includes a drill rod body 1, an extension rod body 2, an anti-backflow valve 3, and a quick connector 4. The drill rod body 1 and the extension rod body 2 are connected by a threaded connection part 13, the extension rod body 2 and the anti-backflow valve 3 are connected by a threaded connection part 13, and the anti-backflow valve 3 and the quick connector 4 are snapped together.

[0049] like Figure 2 As shown, in this embodiment, the drill rod body 1 is an independent structure. The front end of the drill rod body 1 is provided with a conical drill bit 5. The conical drill bit 5 makes it easier to drill into the rock strata. The surface of the conical drill bit 5 may have a protrusion or tooth structure.

[0050] Furthermore, the surface of the drill rod body 1 is provided with multiple grouting holes 6 and a multi-ring disconnected cuttings discharge spiral 11. Each ring disconnected cuttings discharge spiral 11 is disconnected in the circumferential direction, and one or more grouting channels 12 are formed at the disconnection point. By combining the conventional surface grouting holes 6 with the axial grouting channels 12 between the disconnected cuttings discharge spiral 11, the grout is guided to flow through the grouting channels 12 along the axis of the rod body during grouting, forming a uniformly distributed solidified body.

[0051] See also Figure 3 In this embodiment, the extension rod 2 is an independent structure used to extend it as needed. The surface structure of the extension rod 2 is the same as that of the drill rod 1, that is, it is also provided with multiple grouting holes 6 and a multi-ring disconnected rock cuttings guide spiral 11 (not shown in the figure).

[0052] In this embodiment, as Figure 4 As shown, the first end of the anti-backflow valve 3 is provided with a threaded connection part 13, which is used to connect with the threaded connection part 13 at the second end of the extension rod 2 after drilling to a predetermined depth. Furthermore, the anti-backflow valve 3 is provided with an anti-backflow valve switch 7, which can be set at any position on the outer wall of the rod to control free opening and closing. The switch is opened when grouting is required, and the switch is closed in time after grouting is completed to prevent grout backflow.

[0053] In addition, the second end of the anti-backflow valve 3 is provided with a snap-fit ​​connection part, which includes an internal groove 8 and a sealing ring 9. The internal groove 8 is located on the outside of the sealing ring 9 and is used to snap-fit ​​with the quick connector 4. In the grouting process, the sealing ring 9 is squeezed to form a seal at the joint, thereby preventing grout leakage.

[0054] Specifically, in this embodiment, the second end of the drill rod body 1 and the first end of the extension rod body 2 are connected by a threaded connection part 13, wherein the second end of the drill rod body 1 has an internal thread and the first end of the extension rod body 1 has an external thread that is adapted to the internal thread of the second end of the drill rod body 1.

[0055] The second end of the extension rod 2 is connected to the first end of the anti-backflow valve 3 through a threaded connection, wherein the second end of the extension rod 2 has an internal thread, and the first end of the anti-backflow valve 3 has an external thread that matches the internal thread of the second end of the extension rod 2.

[0056] The second end of the anti-backflow valve 3 is connected to the first end of the quick connector 4 via a snap-fit ​​connection.

[0057] The second threaded connection part of quick connector 4 is an external thread adapted to the grouting pipe.

[0058] In this embodiment, as Figure 1 As shown, both the drill rod body 1 and the extension rod body 2 are hollow steel pipes. The outer diameter of both the drill rod body 1 and the extension rod body 2 is 42mm and the inner diameter is 35mm. The length of the drill rod body 1 is 1500mm and the length of the extension rod body 2 is 1500mm. There is at least one extension rod body 2.

[0059] Continue to refer to Figure 1 To further enhance understanding of this utility model, this embodiment also provides a method for the above-mentioned drilling-free, rapid installation of grouting pre-installed small guide pipes, which includes the following steps:

[0060] 1. Prefabricated components:

[0061] The various components of the advanced small conduit are prefabricated in the factory and processed according to the structure and drawings of each component.

[0062] 2. Installation preparation:

[0063] Connect the second end of drill rod 1 to the drilling rig and start drilling at the designed position on the tunnel face. Rock cuttings are discharged through the disconnected rock cuttings discharge spiral 11.

[0064] 3. Segmented lengthening:

[0065] When 20cm of drill rod 1 is exposed, remove the drilling machine, extend rod 2 through threaded connection, and repeat drilling to the designed depth.

[0066] 4. Connect the grouting system: Install the anti-backflow valve 3 to the second end of the extension rod 2, insert the circumferential protrusion 10 of the first end of the quick connector 4 into the internal groove 8 of the anti-backflow valve 3, twist to lock, and ensure that the sealing ring 9 is pressed tightly.

[0067] 5. Grouting operation: The grouting pipe is connected to the second end of the quick connector 4. The grout overflows outward through the grouting hole 6. Under the guiding action of the grouting channel 12 of the disconnected rock cuttings discharge spiral 11, a uniform and effective solidified body is formed on the outside of the rod and between the rock crevices. After the grouting is completed, the anti-backflow valve switch 7 is closed to prevent backflow.

[0068] 6. Dismantle the pipe: Twist the quick connector 4 to disconnect and complete the grouting.

[0069] The pre-conducting pipe for grouting without backflow provided by this utility model has the following advantages:

[0070] 1. This utility model uses a drill rod body with a conical drill bit, which can directly drill into the rock mass, eliminating the need for pre-drilling and effectively solving the problem of hole collapse caused by drilling in loose coal or rock strata, ensuring that the small guide tube is installed smoothly.

[0071] 2. The drill rod body and the extension rod body are connected by threads, which can be lengthened in sections according to construction needs, flexibly adapting to different drilling depth requirements, while facilitating transportation and on-site assembly, and meeting the needs of rapid installation and modular expansion.

[0072] 3. The drill pipe body sidewall is equipped with a multi-ring disconnected cuttings discharge auger, which can discharge cuttings in a timely manner during drilling, reduce drill bit jamming, improve drilling speed and construction safety. In addition, the disconnected cuttings discharge auger also has a flow guiding function during grouting to ensure that the grout forms an effective solidified body between the outside of the pipe body and the rock crevices.

[0073] 4. This utility model is equipped with an anti-backflow valve, which can be closed immediately after grouting is completed to prevent grout backflow and the formation of voids, thereby improving the support strength and grouting reinforcement effect.

[0074] 5. The quick connector adopts a groove and circumferential protrusion design, which can realize the quick connection and disassembly of the grouting pipe through the snap connection part. The sealing ring is tightened to ensure no grout leakage, simplifying the construction process.

[0075] In summary, this utility model is particularly suitable for complex geological conditions such as extremely loose coal seams and fractured rock strata, reducing material waste and repetitive work, lowering construction costs, and ensuring project quality and progress. The various embodiments of this utility model have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A pre-bored quick installation grouting advance small catheter, characterized in that, include: The drill rod body has a tapered drill bit at the first end and a threaded connection at the second end. The surface of the drill rod body is provided with multiple grouting holes and a multi-ring disconnected cuttings discharge spiral. Each ring of the disconnected cuttings discharge spiral is disconnected in the circumferential direction, and one or more grouting channels are formed at the disconnection point. The extension rod has threaded connection parts at both ends. The threaded connection part at the first end is used to connect with the threaded connection part at the second end of the drill rod body. The threaded connection part at the second end is used to connect with the drilling rig during drilling. The surface of the extension rod body is provided with multiple grouting holes and a multi-ring disconnected cuttings discharge spiral. An anti-backflow valve, wherein the first end of the anti-backflow valve is provided with a threaded connection part for connecting with the threaded connection part of the second end of the extension rod after drilling to a predetermined depth, and the second end is provided with a snap-fit ​​connection part; The quick connector has a snap-fit ​​connection at its first end for connecting with the snap-fit ​​connection at the second end of the anti-backflow valve, and a threaded connection at its second end for connecting with the grouting pipe so that grouting can be performed after drilling to a predetermined depth.

2. The punchless quick-mount grouting advance mini-catheter according to claim 1, characterized in that, The threaded connection at the second end of the drill rod body is an internal thread, and the threaded connection at the first end of the extension rod body is an external thread. The internal thread and the external thread are adapted to form a threaded connection.

3. The punchless quick-mount grouting advance mini-catheter according to claim 1, characterized in that, The threaded connection at the second end of the extension rod is an internal thread, and the threaded connection at the first end of the anti-backflow valve is an external thread. The internal thread and the external thread are adapted to form a threaded connection.

4. The punchless quick-mount grouting advance mini-catheter of claim 1, wherein, The anti-backflow valve is equipped with an anti-backflow valve switch.

5. The punchless quick-mount grouting advance mini-catheter of claim 1, wherein, The second end of the anti-backflow valve has an internal groove for its snap-fit ​​connection, and the first end of the quick connector has a circumferential protrusion for its snap-fit ​​connection. The internal groove and the circumferential protrusion are adapted to form a snap-fit ​​connection.

6. The punchless quick-mount grouting advance mini-catheter according to claim 5, characterized in that, The snap-fit ​​connection at the second end of the anti-backflow valve also includes a sealing ring to form a seal at the joint, thereby preventing slurry leakage.

7. The punchless quick-mount grouting advance mini-catheter of claim 1, wherein, The threaded connection at the second end of the quick connector is an external thread, which is adapted to the grouting pipe to form a threaded connection.

8. The punchless quick-mount grouting advance mini-catheter of claim 1, wherein, The multi-ringed, disconnected cuttings extraction spirals are distributed at equal intervals along the axis of the rod.

9. The punchless quick-mount grouting advance mini-catheter of claim 1, wherein, The grouting holes are distributed in a diamond pattern along the axis of the rod. During the grouting process, the grout overflows from the grouting holes and flows into each other along the axis of the rod through the grouting channel to form a uniformly distributed solidified material.

10. The punchless quick-mount grouting advance mini-catheter of claim 1, wherein, The drill pipe body is a hollow steel pipe with a length of 1500mm and a diameter of 42mm; The extension rod is a hollow steel tube, 1500mm in length and 42mm in diameter.

Images