A mechanically bonded orifice pipe and sealing method suitable for water-rich formations

Abstract

This invention discloses a mechanically bonded orifice pipe and sealing method suitable for water-rich formations. The orifice pipe includes a pipe body with an orifice pipe flange at one end and a slurry outlet at the other end. A reducing thread is provided on the outer wall of the pipe body near the flange, with the diameter of the thread decreasing uniformly along the length of the pipe body from the flange position. The flange has multiple bolt holes and multiple concave pentagonal openings, and is bolted to a mounting rod flange. This invention solves problems such as difficulty in slurry compaction during orifice pipe sealing in water-rich formations, difficulty in determining the end of orifice pipe sealing, and the inability of the orifice pipe to withstand high pressure.

Description

Technical Field

[0001] This invention relates to the field of underground engineering grouting technology, specifically to a mechanically bonded orifice pipe and sealing method suitable for water-rich strata. Background Technology

[0002] In the construction of underground engineering projects such as tunnels and roadways, it is often necessary to traverse water-rich strata such as fault fracture zones and fissured formations. Curtain grouting is an important means of pre-reinforcing the strata and sealing the water-conducting channels in front of the working face. The orifice pipe is a crucial device for ensuring grouting pressure and preventing grout leakage during the curtain grouting process. The quality of the anchorage between the orifice pipe and the stratum directly affects the implementation of the curtain grouting plan. A tight anchorage between the orifice pipe and the stratum is a vital safety guarantee to prevent high-pressure water from entering the underground engineering when the grouting hole is opened, thus ensuring the safety of underground engineering construction.

[0003] However, sealing the orifice pipe in water-rich strata presents the following problems: First, during the sealing process of horizontal and inclined boreholes, the grout flows out at the orifice due to gravity, making it difficult for the grout to remain between the orifice pipe and the stratum, thus failing to guarantee the sealing quality of the orifice pipe; Second, during the conventional orifice pipe sealing process, grout leakage at the orifice makes it impossible to determine the filling status of the pores between the orifice pipe and the grout stop wall, and there is a lack of a direct method to judge the compactness of the filling between the orifice pipe and the stratum; Third, during high-pressure grouting and high-pressure water inrush processes, the anchoring between the orifice pipe and the stratum is difficult to meet the requirements of pressure resistance and seepage prevention. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a mechanically bonded orifice pipe suitable for water-rich formations, which solves the problems of difficulty in compacting the slurry during the orifice pipe sealing process in water-rich formations, difficulty in judging the end of orifice pipe sealing, and inability of orifice pipe to withstand high pressure.

[0005] The technical solution of the present invention is as follows:

[0006] In a first aspect of the invention, a mechanically bonded perforated pipe suitable for water-rich formations is provided, comprising a perforated pipe body, one end of which is provided with a perforated pipe flange, and the other end serving as a slurry outlet; a reducing thread is provided on the outer wall surface of the perforated pipe body near the perforated pipe flange, the diameter of which decreases uniformly from the position of the perforated pipe flange along the length of the perforated pipe body; the perforated pipe flange is provided with a plurality of bolt holes and a plurality of concave pentagonal openings, and the perforated pipe flange is connected to a mounting rod flange by bolts.

[0007] In some embodiments of the present invention, the reducing thread includes a front reducing thread, an intermediate reducing thread, and a rear reducing thread connected in sequence, wherein the rear reducing thread is connected to the end face of the orifice flange.

[0008] In some embodiments of the present invention, the length of the variable diameter thread is greater than the thickness of the grout stop wall.

[0009] In some embodiments of the present invention, the mounting rod flange is provided with a plurality of convex pentagonal teeth, which cooperate with the concave pentagonal opening on the orifice pipe flange.

[0010] In some embodiments of the present invention, the mounting rod flange is fixed to one end of the mounting rod, and the other end of the mounting rod is connected to the drill rod by threads.

[0011] In a second aspect of the invention, a method for sealing mechanically bonded orifice pipes suitable for water-rich formations is provided, comprising the following steps:

[0012] Positioning and layout on the grout stop wall, determining the installation location of the orifice pipe and drilling holes;

[0013] The drill rod of the drilling rig is connected to the borehole pipe through the connecting rod. The drilling rig pushes the borehole pipe into the drilled hole until the front reducing thread on the borehole pipe contacts the grout stop wall.

[0014] The drilling rig continues to rotate and advance, rotating the borehole pipe into the grout stop wall and the surrounding rock behind the grout stop wall. When the flange of the borehole pipe contacts the grout stop wall, the rotation stops and the pipe is pushed in.

[0015] Connect the orifice flange to the grouting pipe flange to seal the orifice. Inject adhesive into the grouting pipe. When the adhesive slowly flows out of the gap between the reducing thread on the orifice pipe and the grout-stopping wall, stop grouting.

[0016] Once the adhesive reaches its designed strength, the orifice pipe is installed, and a grouting pipe is drilled into the orifice pipe to carry out curtain grouting.

[0017] In some embodiments of the present invention, the depth of the orifice pipe mounting hole is 5-10 cm greater than the length of the orifice pipe, and the diameter of the hole is 5-10 mm greater than the diameter of the orifice pipe.

[0018] In some embodiments of the present invention, the adhesive is a cement-water glass two-component slurry.

[0019] In some embodiments of the present invention, when the connecting rod is connected to the orifice pipe, the orifice pipe flange and the connecting rod flange are connected by bolts, and the convex pentagonal teeth on the connecting rod flange are inserted into the concave pentagonal opening on the orifice pipe flange.

[0020] In some embodiments of the present invention, the orifice pipe flange and the grouting pipe flange are connected by bolts to seal the gap between the orifice pipe and the surrounding rock behind the grout stop wall, and the gap between the orifice pipe and the grout stop wall.

[0021] One or more technical solutions of the present invention have the following beneficial effects:

[0022] (1) This invention can effectively solve the problem of grout leakage at the orifice when the orifice pipe is installed at an upward or horizontal angle, ensuring that the grout between the orifice pipe and the formation is filled tightly and guaranteeing the sealing quality of the orifice pipe.

[0023] (2) In this invention, the reducing thread on the orifice pipe and the adhesive flowing out of the pore in the formation can be used as the judgment standard for the compactness of the grout inside the mechanically bonded orifice pipe. It can intuitively judge the timing of the end of the sealing grouting of the orifice pipe, and effectively solve the problem of relying on manual labor to end the sealing process of conventional orifice pipes.

[0024] (3) In this invention, the mechanical-bonded orifice pipe can be fixed to the stratum by both mechanical and bonded methods. The variable diameter thread is embedded in the stratum to play a mechanical anchoring role, and the bond fills the pores between the orifice pipe and the surrounding rock to play a bonded anchoring role. The mechanical anchoring and bonded anchoring strengths can compensate for each other, and the overall anchoring strength is greatly improved. This prevents the reaction force of the grouting pressure during the grouting process from causing the orifice pipe to detach. If the detached orifice pipe flies out, it will cause injury to personnel behind the grout stop wall.

[0025] (4) In this invention, the variable diameter thread is embedded in the grout-stopping wall and the surrounding rock behind the grout-stopping wall, which increases the length of the seepage channel for free water from the surrounding rock to enter the underground project through the orifice pipe and reduces the amount of seepage. At the same time, the embedding depth of the variable diameter thread and the grout-stopping wall gradually increases. The variable diameter thread can play the role of cutting off the seepage of free water layer by layer, ensuring the long-term stability of the orifice pipe sealing and providing a guarantee for the long-term curtain grouting of underground projects. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the external structure of the mechanically bonded orifice tube of the present invention;

[0027] Figure 2 This is a schematic diagram of the external structure of the mechanically bonded orifice pipe mounting rod of the present invention;

[0028] Figure 3 This is a schematic diagram of the mechanically bonded orifice tube of the present invention;

[0029] Figure 4 This is a schematic diagram of the mechanically bonded orifice tube mounting rod of the present invention;

[0030] Figure 5 This is a schematic diagram of the mechanically bonded orifice flange of the present invention.

[0031] Figure 6 This is a schematic diagram of the mounting rod flange of the present invention;

[0032] Figure 7This is a schematic diagram of the orifice sealing stage of the present invention;

[0033] Figure 8 This is a schematic diagram of the orifice sealing process of the present invention.

[0034] Figure 9 This is a schematic diagram of the orifice sealing process of the present invention.

[0035] Figure 10 This is a schematic diagram showing the completion of the orifice sealing of the present invention.

[0036] In the diagram: 1. Orifice pipe flange; 2. Rear reducer thread; 3. Intermediate reducer thread; 4. Front reducer thread; 5. Orifice pipe body; 6. Orifice pipe grout outlet; 7. Mounting rod flange; 8. Mounting rod; 9. Mounting rod-drill rod thread; 10. Concave pentagonal opening; 11. Bolt hole; 12. Convex pentagonal tooth; 13. Adhesive; 14. Surrounding rock behind the grout stop wall; 15. Grout stop wall; 16. Grout diffusion area in the early stage of orifice pipe sealing; 17. Grout diffusion area in the middle stage of orifice pipe sealing; 18. Grout diffusion area in the later stage of orifice pipe sealing; 19. Grout outlet at the end of orifice pipe sealing. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] Example 1

[0039] In a typical embodiment of the present invention, a mechanically bonded orifice pipe suitable for water-rich formations is proposed, such as... Figures 1-6 As shown, the device includes an orifice pipe body 5, with an orifice pipe flange 1 at one end and an orifice pipe outlet 6 at the other end. A reducing thread is provided on the outer wall of the orifice pipe body 5 near the orifice pipe flange 1, and the diameter of the reducing thread decreases uniformly from the position of the orifice pipe flange 1 along the length of the orifice pipe body 5. The orifice pipe flange 1 is provided with multiple bolt holes 11 and multiple concave pentagonal openings 10, and the orifice pipe flange 1 is connected to the mounting rod flange 7 by bolts.

[0040] In this embodiment, the reducing thread includes a front reducing thread 4, an intermediate reducing thread 3, and a rear reducing thread 2 connected in sequence. The rear reducing thread 2 is connected to the end face of the orifice flange 1. The diameter of the intermediate reducing thread 3 is between that of the front reducing thread 4 and the rear reducing thread 2, and increases uniformly from the front reducing thread 4 to the rear reducing thread 2. Furthermore, the length of the reducing thread is greater than the thickness of the grout stop wall 15 to ensure that the reducing thread can be mechanically connected to both the grout stop wall 15 and the surrounding rock 14 behind the grout stop wall.

[0041] The variable diameter thread increases the length of the seepage channel for free water from the surrounding rock to enter the underground project through the orifice pipe, reducing the seepage volume. At the same time, the embedment depth of the variable diameter thread and the grout stop wall gradually increases, and the variable diameter thread can play the role of cutting off the seepage of free water layer by layer, ensuring the long-term stability of the orifice pipe sealing and providing a guarantee for long-term curtain grouting in underground projects.

[0042] In this embodiment, the mounting rod flange 7 is provided with multiple convex pentagonal teeth 12, which mate with concave pentagonal openings 10 on the orifice pipe flange 1. Further, the mounting rod flange 7 is fixed to one end of the mounting rod 8, and the other end of the mounting rod 8 is connected to the drill rod via a mounting rod-drill rod thread 9. The orifice pipe is connected to the drill rod via the mounting rod 8, and the engagement of the concave pentagonal openings 10 and the convex pentagonal teeth 12 ensures that the orifice pipe can rotate synchronously with the drill rod, achieving the rotational propulsion process. The mechanically bonded orifice pipe installation method for water-rich formations provided in this embodiment is as follows:

[0043] ① Position and lay out the grouting wall, determine the installation position of the orifice pipe and drill holes. The hole depth is slightly longer than the length of the mechanical-bonded orifice pipe, and the hole diameter is slightly smaller than the orifice pipe diameter.

[0044] ② Drill rod connection and installation rod, the convex pentagonal teeth on the installation rod are connected to the concave pentagonal opening on the mechanical-bonded drill rod flange;

[0045] ③ The drilling rig pushes the mechanically bonded orifice pipe into the drilled hole until the front reducing thread on the mechanically bonded orifice pipe contacts the grout stop wall.

[0046] ④ The drilling rig rotates and propels the mechanically bonded orifice pipe into the grout stop wall and the surrounding rock behind the grout stop wall. When the flange of the mechanically bonded orifice pipe contacts the grout stop wall, the rotation stops and the pipe is pushed in, ensuring that the reducing thread is fully rotated into the grout stop wall and the surrounding rock behind the grout stop wall.

[0047] ⑤ Connect the mechanically bonded orifice flange to the grouting pipe flange to seal the orifice. Inject adhesive into the grouting pipe. Stop grouting when adhesive slowly flows out of the gap between the reducing thread on the mechanically bonded orifice and the grout-stopping wall.

[0048] ⑥ Once the adhesive reaches its designed strength, the mechanically bonded orifice pipe is installed. Grouting pipes can then be drilled into the orifice pipes to carry out curtain grouting.

[0049] The mechanically bonded orifice pipe provided in this embodiment, suitable for water-rich strata, can utilize both mechanical and bonded fixing methods. The variable-diameter thread is embedded in the strata to provide mechanical anchoring, while the bond fills the pores between the orifice pipe and the surrounding rock to provide bonded anchoring. The mechanical and bonded anchoring strengths can compensate for each other, significantly improving the overall anchoring strength. This prevents the orifice pipe from detaching due to the reaction force of the grouting pressure during the grouting process, which could cause injury to personnel behind the grout stop wall if the detached orifice pipe flies out.

[0050] Example 2

[0051] In a typical embodiment of the present invention, a method for sealing mechanically bonded orifice pipes suitable for water-rich formations is provided, comprising the following steps:

[0052] Positioning and layout on the grout stop wall, determining the installation location of the orifice pipe and drilling holes;

[0053] The drill rod of the drilling rig is connected to the borehole pipe through the connecting rod. The drilling rig pushes the borehole pipe into the drilled hole until the front reducing thread on the borehole pipe contacts the grout stop wall.

[0054] The drilling rig continues to rotate and advance, rotating the borehole pipe into the grout stop wall and the surrounding rock behind the grout stop wall. When the flange of the borehole pipe contacts the grout stop wall, the rotation stops and the pipe is pushed in.

[0055] Connect the orifice flange to the grouting pipe flange to seal the orifice. Inject adhesive into the grouting pipe. When the adhesive slowly flows out of the gap between the reducing thread on the orifice pipe and the grout-stopping wall, stop grouting.

[0056] Once the adhesive reaches its designed strength, the orifice pipe is installed, and a grouting pipe is drilled into the orifice pipe to carry out curtain grouting.

[0057] In this embodiment, the depth of the orifice pipe mounting hole is 5-10cm greater than the length of the orifice pipe, and the diameter of the hole is 5-10mm greater than the diameter of the orifice pipe.

[0058] In this embodiment, the binder 13 is a cement-water glass two-component slurry, which has the characteristics of early strength and rapid setting.

[0059] In this embodiment, when the connecting rod is connected to the orifice pipe, the orifice pipe flange and the connecting rod flange are connected by bolts, and the convex pentagonal teeth on the connecting rod flange are inserted into the concave pentagonal opening on the orifice pipe flange; the mounting rod 8 is connected to the drill rod of the drilling rig through the mounting rod-drill rod thread 9.

[0060] In this embodiment, the orifice pipe flange and the grouting pipe flange are connected by bolts. The grouting pipe extends into the orifice pipe to seal the gap between the orifice pipe and the surrounding rock behind the grout stop wall, and the gap between the orifice pipe and the grout stop wall.

[0061] like Figures 7-10 As shown, in the early stage of orifice sealing, the adhesive flows out from the slurry outlet 6 of the orifice and fills the gap between the threads embedded in the surrounding rock in the intermediate diameter thread 3 of the orifice, forming the slurry diffusion area 16 in the early stage of orifice sealing.

[0062] During the middle stage of orifice sealing, the adhesive 13 continues to diffuse, uniformly filling the space between the reducing thread and the grout stop wall. The grout diffuses layer by layer, forming the grout diffusion area 17 during the middle stage of orifice sealing.

[0063] In the later stage of orifice sealing, the adhesive continues to diffuse, filling the space between the reducing thread 3 and the grout stop wall 15, forming the grout diffusion area 19 in the later stage of orifice sealing; at this time, the adhesive continues to be injected, and the adhesive flows out from the grout outlet 19 at the end of orifice sealing, and the orifice sealing process ends.

[0064] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A mechanically bonded orifice pipe suitable for water-rich formations, characterized in that, The device includes an orifice pipe body, one end of which is provided with an orifice pipe flange, and the other end serving as an orifice pipe slurry outlet. A reducing thread is provided on the outer wall of the orifice pipe body near the orifice pipe flange, the diameter of which decreases uniformly along the length of the orifice pipe body from the position of the orifice pipe flange. The orifice pipe flange has multiple bolt holes and multiple concave pentagonal openings, and the orifice pipe flange is connected to the mounting rod flange by bolts. The reducing thread includes a front reducing thread, an intermediate reducing thread, and a rear reducing thread connected in sequence, wherein the rear reducing thread is connected to the end face of the orifice pipe flange. The length of the variable diameter thread is greater than the thickness of the grout stop wall; The mounting rod flange is fixed to one end of the mounting rod.

2. The mechanically bonded orifice pipe suitable for water-rich strata as described in claim 1, characterized in that, The mounting rod flange is provided with multiple convex pentagonal teeth, which cooperate with the concave pentagonal openings on the orifice pipe flange.

3. The mechanically bonded orifice pipe suitable for water-rich strata as described in claim 1, characterized in that, The other end of the mounting rod is connected to the drill rod via a thread.

4. A sealing method for a mechanically bonded orifice pipe suitable for water-rich formations as described in any one of claims 1-3, characterized in that, Includes the following steps: Positioning and layout on the grout stop wall, determining the installation location of the orifice pipe and drilling holes; The drill rod of the drilling rig is connected to the borehole pipe through the connecting rod. The drilling rig pushes the borehole pipe into the drilled hole until the front reducing thread on the borehole pipe contacts the grout stop wall. The drilling rig continues to rotate and advance, rotating the borehole pipe into the grout stop wall and the surrounding rock behind the grout stop wall. When the flange of the borehole pipe contacts the grout stop wall, the rotation stops and the pipe is pushed in. Connect the orifice flange to the grouting pipe flange to seal the orifice. Inject adhesive into the grouting pipe. When the adhesive slowly flows out of the gap between the reducing thread on the orifice pipe and the grout-stopping wall, stop grouting. Once the adhesive reaches its designed strength, the orifice pipe is installed, and a grouting pipe is drilled into the orifice pipe to carry out curtain grouting.

5. The sealing method for mechanically bonded orifice pipes suitable for water-rich strata as described in claim 4, characterized in that, The depth of the hole for the pipe installation should be 5-10cm greater than the length of the pipe, and the diameter of the hole should be 5-10mm greater than the diameter of the pipe.

6. The sealing method for mechanically bonded orifice pipes suitable for water-rich formations as described in claim 4, characterized in that, The adhesive is a cement-water glass two-component slurry.

7. The sealing method for mechanically bonded orifice pipes suitable for water-rich formations as described in claim 4, characterized in that, When connecting the connecting rod to the orifice pipe, the orifice pipe flange and the connecting rod flange are connected by bolts, and the convex pentagonal teeth on the connecting rod flange are inserted into the concave pentagonal opening on the orifice pipe flange.

8. The sealing method for mechanically bonded orifice pipes suitable for water-rich formations as described in claim 4, characterized in that, The orifice pipe flange and the grouting pipe flange are connected by bolts to seal the gap between the orifice pipe and the surrounding rock behind the grout stop wall, and the gap between the orifice pipe and the grout stop wall.

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