A horizontal hole removable packing type hydraulic expansion type two-stage hole clamping device

Abstract

The present invention discloses a horizontal hole removable packing type hydraulic expansion type two-stage orifice clamping device, comprising a primary orifice clamping device based on packing and a secondary orifice clamping device connected between the primary orifice clamping device and the orifice pipe; the secondary orifice clamping device comprises a rubber sleeve sleeved on a working pipe and a secondary clamping mechanism capable of radially compressing the rubber sleeve, an inner annular gap is provided between the working pipe and the rubber sleeve, the secondary clamping mechanism compresses the rubber sleeve radially inwardly by filling a fluid into the outer peripheral side of the rubber sleeve, so that the inner annular gap is sealed by the rubber sleeve clamped on the working pipe; the present invention aims at the defect that the packing of the traditional horizontal drilling blowout prevention device cannot be replaced safely, and by arranging a secondary orifice clamping device to seal the orifice when the packing needs to be replaced, the risk of sandblasting and water gushing when the packing is replaced can be completely avoided, the packing can be replaced safely and reliably, and the risk can be controlled.

Description

Technical Field

[0001] The invention relates to the technical field of horizontal hole construction such as subway construction, municipal engineering, tunnel engineering, etc., in particular to a detachable packing type hydraulic expansion type double-stage hole opening clamping device for a horizontal hole. Background Art

[0002] In the process of subway, municipal engineering and tunnel construction, horizontal hole construction technology is used. In order to prevent the risk of sandblasting and water gushing during drilling due to drilling into water-rich strata, a borehole blowout preventer is generally set at the borehole to seal the horizontal drill rod or freeze the gap between the drill rod and the borehole (orifice pipe). Usually, a packing-type sealing device is used to stop water. However, as the drill rod extends and rotates, the packing will be worn. When it is worn to a certain extent, even if the packing is adjusted again, the packing can no longer stop water. At this time, the packing needs to be replaced. However, if the groundwater is pressurized water, directly replacing the packing is likely to cause a gushing danger, and rapid soil and water loss will also cause serious damage to the tunnel structure itself. Therefore, a device that can replace the packing while ensuring construction safety is needed. Summary of the invention

[0003] To this end, the technical problem to be solved by the present invention is to provide a horizontal hole removable packing type hydraulic expansion type two-stage orifice clamping device which has a simple structure, is safe and reliable, is easy to use, and has controllable risks.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A horizontal hole removable packing type hydraulic expansion type two-stage orifice clamping device, comprising a primary orifice clamping device based on packing and a secondary orifice clamping device connected between the primary orifice clamping device and the orifice pipe;

[0006] The secondary orifice pressing device comprises a rubber sleeve sleeved on the working pipe and a secondary pressing mechanism capable of compressing the rubber sleeve radially, an inner annular gap is provided between the working pipe and the rubber sleeve, and the secondary pressing mechanism compresses the rubber sleeve radially inward by filling a fluid into the outer peripheral side of the rubber sleeve, so that the inner annular gap is sealed by the rubber sleeve tightly hugging the working pipe;

[0007] The primary orifice clamping device is similar to the traditional orifice clamping device based on packing, which plays a water-stopping role by compressing the packing; the secondary orifice clamping device is a protective and sealing device that replaces the packing to play a water-stopping role when the packing in the primary orifice clamping device is replaced;

[0008] During the horizontal hole drilling process, the first-level hole clamping device is in a clamping state to maintain the sealing and water-stopping function, and the second-level hole clamping device is in a relaxed state; when the packing is worn and needs to be replaced, the second-level hole clamping device is in a clamping state to maintain the sealing and water-stopping function, so that the packing can be safely replaced.

[0009] Furthermore, the rubber sleeve is composed of a cylindrical middle hugging portion and an annular plate portion integrally connected to the outer periphery of both ends of the middle hugging portion, the distance between the two annular plate portions is always kept fixed, and the filled fluid pushes the middle hugging portion inward to achieve a tight hugging of the working pipe.

[0010] Furthermore, the secondary clamping mechanism includes a secondary outer sleeve and a joint assembly; the secondary outer sleeve includes a middle cylinder portion and a vertical plate portion vertically connected to both ends of the middle cylinder portion, and the joint assembly is installed on the middle cylinder portion; the annular plate portion at the front end is clamped and fixed between the vertical plate portion on the front side and the orifice tube, and the annular plate portion at the rear end is clamped and fixed between the vertical plate portion on the rear side and the primary orifice clamping device; an outer annular gap is provided between the middle cylinder portion and the middle hugging portion, and the inner annular gap is located between the middle hugging portion and the working tube.

[0011] Furthermore, the secondary clamping mechanism also includes a first connecting piece and a second connecting piece for respectively installing the two vertical plate parts on the front end of the orifice tube and the primary orifice clamping device.

[0012] Furthermore, the joint assembly includes a water inlet nozzle installed on the middle cylinder and connected to the outer annular gap, a tee installed on the water inlet nozzle, an inlet valve installed at one end of the tee, and a pressure gauge installed on the side port of the tee.

[0013] Furthermore, the other end of the water inlet valve is connected to a pressure pump through a pipeline.

[0014] Furthermore, the primary orifice clamping device includes a primary outer sleeve, a clamping plug and a third connecting piece for installing the clamping plug on the primary outer sleeve, and the packing is arranged in an annular storage space surrounded by the primary outer sleeve, the clamping plug and the working pipe.

[0015] Furthermore, the horizontal hole removable packing type hydraulic expansion type two-stage orifice clamping device also includes a valve arranged on the orifice pipe or between the orifice pipe and the secondary clamping mechanism.

[0016] The technical solution of the present invention achieves the following beneficial technical effects:

[0017] The present invention aims at the defect that the packing cannot be safely replaced in the conventional horizontal drilling blowout prevention device. By setting a secondary orifice clamping device, the orifice is sealed when the packing needs to be replaced. The risk of sandblasting and water gushing when the packing is replaced can be completely avoided. The packing can be replaced safely and reliably, and the risk can be controlled.

[0018] The invention can be reused, and the worn packing can be replaced multiple times in one horizontal drilling construction process, so as to ensure that the horizontal hole can continue to be drilled under the condition of hole mouth compression;

[0019] The invention has a simple structure, is easy to process, install and operate, and is convenient to use, and can be widely used in horizontal hole drilling construction in subway construction, municipal engineering and tunnel engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the primary orifice clamping device and the secondary orifice clamping device before being clamped;

[0021] Figure 2 It is a structural schematic diagram of the first-level orifice clamping device of the present invention in a clamping state;

[0022] Figure 3 It is a structural schematic diagram of the clamping state of the secondary orifice clamping device of the present invention;

[0023] Figure 4 It is a schematic diagram of the cooperation between the rubber sleeve and the secondary outer sleeve according to an embodiment of the present invention.

[0024] The reference numerals in the figure are: 1-working pipe, 2-compression plug, 3-primary outer sleeve, 4-packing, 5-rubber sleeve, 6-secondary outer sleeve, 7-second bolt, 8-water inlet nozzle, 9-tee pipe, 10-third bolt, 11-pressure gauge, 12-outer annular gap, 13-first bolt, 14-valve, 15-orifice pipe, 16-water inlet valve, 17-bypass pipe, 18-small valve. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] like Figures 1 to 4 As shown, a horizontal hole removable packing 4 type hydraulic expansion type two-stage orifice clamping device includes a primary orifice clamping device based on the packing 4 and a secondary orifice clamping device connected between the primary orifice clamping device and the orifice pipe 15;

[0027] The primary orifice clamping device comprises a primary outer sleeve 3, a clamping plug 2 and a third connecting piece for mounting the clamping plug 2 on the primary outer sleeve 3, and the packing 4 is arranged in an annular storage space surrounded by the primary outer sleeve 3, the clamping plug 2 and the working pipe 1;

[0028] The secondary orifice clamping device includes a rubber sleeve 5 sleeved on the working pipe 1 and a secondary clamping mechanism that can radially compress the rubber sleeve 5, there is an inner annular gap between the working pipe 1 and the rubber sleeve 5, the secondary clamping mechanism compresses the rubber sleeve 5 radially inward by filling fluid into the outer peripheral side of the rubber sleeve 5, so that the inner annular gap is sealed by the rubber sleeve 5 tightly hugging the working pipe 1; the working pipe 1 is a horizontal drill rod or a frozen drill rod in the prior art; the orifice pipe 15 is a conventional technology, the orifice pipe 15 is installed on the tunnel segment and the foundation pit wall, and a valve 14 is generally installed on the orifice pipe 15. The valve is conventionally set, the purpose is to play the role of orifice water stopping and anti-blowout when all the working pipes 1 are taken out from the horizontal hole, the valve 14 is set between the orifice pipe 15 and the secondary clamping mechanism, specifically, the valve 14 is installed at the rear end of the orifice pipe 15, and the valve 14 is connected between the orifice pipe 15 and the secondary clamping mechanism through a flange; preferably, as Figure 1 As shown, a bypass pipe 17 and a small valve 18 are provided on the orifice pipe 15 to release pressure, serving as a primary blowout prevention device for the orifice;

[0029] The primary orifice clamping device is similar to the conventional orifice clamping device based on the packing 4, and plays a water-stopping role by compressing the packing 4; the secondary orifice clamping device is a protective and sealing device that replaces the packing 4 to play a water-stopping role when the packing 4 in the primary orifice clamping device is replaced;

[0030] During the horizontal hole drilling process, the first-level hole clamping device is in a clamping state to maintain the sealing and water-stopping function, and the second-level hole clamping device is in a relaxed state and will not contact the outer wall of the working pipe 1; when the packing 4 is severely worn and needs to be replaced, the second-level hole clamping device is in a clamping state to maintain the sealing and water-stopping function, so that the packing 4 can be safely replaced.

[0031] Further, such as Figures 1 to 4As shown, the rubber sleeve 5 is composed of a cylindrical middle embrace portion and an annular plate portion integrally connected to the outer periphery of both ends of the middle embrace portion, the distance between the two annular plate portions is always kept fixed, and the filled fluid pushes the middle embrace portion inward to achieve the clamping of the working pipe 1; the material properties of the rubber sleeve 5 in the secondary orifice clamping device have certain technical requirements, specifically, the middle embrace portion is a straight cylindrical shape, the length of the rubber sleeve 5 is not less than 150mm, the thickness of the rubber sleeve 5 is 8mm-12mm, and the difference between the inner diameter of the rubber sleeve 5 and the outer diameter of the working pipe 1 is 10mm -16mm, the difference between the inner diameter of the secondary outer sleeve 6 and the outer diameter of the rubber sleeve 5 is 8mm-12mm, so that the rubber sleeve 5 can cooperate with the working pipe 1 and the secondary clamping mechanism to form an inner annular gap and an outer annular gap 12. The inner annular gap prevents the working pipe 1 in drilling states such as rotation and axial displacement from contacting the inner wall of the rubber sleeve 5 during horizontal drilling, and does not cause wear on the inner wall of the rubber sleeve 5; the rubber sleeve 5 is similar to the KXT-2 type rubber flexible joint in the prior art, but the specific shape, etc. are different.

[0032] Further, such as Figures 1 to 4 As shown, the secondary clamping mechanism includes a secondary outer sleeve 6, a joint assembly, and a first connector and a second connector for mounting two vertical plates on the orifice tube 15 and the front end of the primary orifice clamping device, respectively; the secondary outer sleeve 6 includes a middle cylinder portion and vertical plates vertically connected to both ends of the middle cylinder portion, and the joint assembly is mounted on the middle cylinder portion; the annular plate portion located at the front end is clamped and fixed between the vertical plate portion on the front side and the orifice tube 15, and the annular plate portion located at the rear end is clamped and fixed between the vertical plate portion on the rear side and the primary orifice clamping device; An outer annular gap 12 is provided between the middle cylinder part and the middle embrace part, and the inner annular gap is located between the middle embrace part and the working tube 1; specifically, the first connecting member and the second connecting member are both bolts and nuts matched therewith, which are respectively denoted as the first bolt 13 and the second bolt 7; the middle cylinder part is made of seamless steel pipe, the vertical plate part is a flange and is welded at both ends of the middle cylinder part, and mounting holes are evenly provided on the vertical plate part, which is connected to the flanges of the components on the front and rear sides of the secondary clamping mechanism through the first bolt 13, the second bolt 7 and the mounting holes; the structure is simple and easy to install.

[0033] Further, such as Figures 1 to 4As shown, the joint assembly includes a water inlet nozzle 8 installed on the middle cylinder and connected to the outer annular gap 12, a tee pipe 9 installed on the water inlet nozzle 8, a water inlet valve 16 installed at one end of the tee pipe 9, and a pressure gauge 11 installed on the side port of the tee pipe 9; specifically, the water inlet valve 16 adopts a ball valve, and a pressure port is installed at the other end of the ball valve. The pressure port and the ball valve are connected by thread, and the pressure port has a thread for easy connection of the pipeline; the number of the water inlet nozzle 8 is one or more, and the water inlet nozzle 8 and the secondary outer sleeve 6 are connected by thread or welding. The three-way pipe 9 is made of high-quality steel, and the outer diameter of the three-way pipe 9 matches the water inlet nozzle 8; the three-way pipe 9 and the water inlet valve 16 are connected by threaded connection; the pressure gauge 11 is connected to the connecting pipe by threaded connection, and the other end of the connecting pipe is welded to the side opening of the three-way pipe; in actual use, a water pump or an air pump is required to provide pressure for the fluid, and the injected fluid can be clean water, air or other liquid substances. Preferably, the other end of the water inlet valve 16 is connected to a pressure pump through a pipeline, and the pressure pump is a manual pressure pump or an electric pressure pump, and clean water is used as the pressure supply fluid medium;

[0034] The pressure gauge 11 displays the water pressure value in the outer annular gap 12 in real time; when the water pressure injected into the outer annular gap 12 reaches a certain value, specifically, when the water pressure is greater than 5MPa and less than 10MPa, the ball valve is closed, and the water pressure compresses the rubber sleeve 5 to produce radial deformation, and the inner diameter of the rubber sleeve 5 is reduced, so that the inner wall of the rubber sleeve 5 tightly embraces the working pipe 1 and seals the inner annular gap, thereby achieving the water-stopping effect, and then the old packing 4 in the primary orifice clamping device is replaced; after the new packing 4 is installed, the pressure pump is removed, and the ball valve is opened, the water pressure in the outer annular gap 12 is released, and the radial deformation of the rubber sleeve 5 disappears, and the rubber sleeve 5 returns to a naturally relaxed state, then the inner wall of the rubber sleeve 5 is separated from the working pipe 1, the original inner annular gap is restored, and the secondary orifice clamping device no longer has a water-stopping function.

[0035] When installing the packing 4, firstly, the primary outer sleeve 3 is connected to the secondary outer sleeve 6 flange through the mounting plate, the packing 4 is wound along the outer diameter of the working pipe 1 and filled into the annular storage space, and then the pressing plug 2 is pressed into the primary outer sleeve 3 to a certain depth through the third connecting member (the third connecting member is specifically the third bolt 10). Figure 2 The state shown in , makes the packing 4 in a compressed state to maintain the water-stopping effect;

[0036] During the horizontal hole drilling process, the working tube 1 is constantly rubbing against the packing 4 wound thereon through the rotational motion and axial horizontal movement of the working tube 1. The packing 4 is generally made of a packing rope soaked in butter pure cotton yarn and butter oil. This friction causes the packing 4 to wear. When the packing 4 starts to wear, the front end of the compression plug 2 is continuously pushed forward by continuously tightening the third bolt 10 to further compress the packing 4 and continue to maintain the sealing state. However, as the horizontal hole drilling length continues to extend, the wear of the packing 4 is also increasing. When the wear reaches a certain extent, even if the third bolt 10 is tightened again, the worn packing 4 cannot completely seal and stop water. At this time, in order to ensure that the horizontal drilling hole does not produce the risk of sandblasting and water gushing, a new packing 4 must be replaced. When replacing the packing 4, it must be carried out under the protection of the secondary hole clamping device.

[0037] Before replacing the packing 4 of the primary orifice clamping device, stop the horizontal drilling work; fill the secondary clamping device with water, and use the water expansion force to make the rubber sleeve 5 produce radial compression deformation, so that it is in a sealed and water-stopping state; specifically, when the secondary orifice clamping device performs the water-stopping operation, a manual pressure pump or an electric pressure pump is used, and the pressure pump is connected to the water pressure port and the water inlet valve 16 through a pipeline, and clean water is injected into the water pressure port, and the clean water is injected into the water inlet 8 along the three-way pipe 9, and then enters the outer annular gap 12 between the secondary outer sleeve 6 and the rubber sleeve 5. The pressure gauge 11 can indicate the water pressure value in the outer annular gap 12. When the pressure value reaches a certain value, the water pressure will tightly hold the rubber sleeve 5 to the outer wall of the working pipe 1, thereby playing a water-stopping role, ensuring that sandblasting and water spraying will not occur, and close the water inlet valve 16 to maintain this water pressure; under the protection of the secondary orifice clamping device, remove the compression plug 2 and the old packing 4 of the primary orifice clamping device, and replace the new packing 4; Figure 3 This is the state of the present invention when the secondary orifice clamping device is clamped and the clamping plug 2 is removed;

[0038] Finally, reinstall the compression plug 2 and tighten the third bolt 10 to put the first-level orifice compression device in a sealed and water-stopping state; remove the pressure pump, open the water inlet valve 16 on the second-level orifice compression device, release the pressurized water in the outer annular gap 12, and put the rubber sleeve 5 in a naturally relaxed state. The rubber sleeve 5 then returns to its original shape using rubber elasticity and separates from the surface of the working pipe 1. At this time, there is a certain gap between the working pipe 1 and the inner wall of the rubber sleeve 5. This gap is the inner annular gap, and the rotation and axial displacement of the working pipe 1 will not contact or bump into the rubber sleeve 5. After the rubber sleeve 5 is relaxed, start the mud pump and the horizontal drilling rig to continue normal horizontal drilling work.

[0039] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A horizontal hole removable packing (4) type hydraulic expansion type two-stage hole clamping device, characterized in that: It comprises a primary orifice clamping device based on a packing (4) and a secondary orifice clamping device connected between the primary orifice clamping device and the orifice pipe (15); The secondary orifice pressing device comprises a rubber sleeve (5) sleeved on the working pipe (1) and a secondary pressing mechanism capable of compressing the rubber sleeve (5) in the radial direction, an inner annular gap is provided between the working pipe (1) and the rubber sleeve (5), and the secondary pressing mechanism compresses the rubber sleeve (5) in the radial direction inward by filling a fluid into the outer peripheral side of the rubber sleeve (5), so that the inner annular gap is sealed by the rubber sleeve (5) tightly hugging the working pipe (1); The rubber sleeve (5) is composed of a cylindrical middle embracing portion and an annular plate portion integrally connected to the outer periphery of both ends of the middle embracing portion, the distance between the two annular plate portions is always kept fixed, and the filled fluid pushes the middle embracing portion inwards to achieve a tight embrace of the working pipe (1); The secondary clamping mechanism comprises a secondary outer sleeve (6) and a joint assembly; the secondary outer sleeve (6) comprises a middle cylinder portion and a vertical plate portion vertically connected to both ends of the middle cylinder portion, and the joint assembly is installed on the middle cylinder portion; the annular plate portion at the front end is clamped and fixed between the vertical plate portion at the front side and the orifice tube (15), and the annular plate portion at the rear end is clamped and fixed between the vertical plate portion at the rear side and the primary orifice clamping device; an outer annular gap (12) is provided between the middle cylinder portion and the middle embrace portion, and the inner annular gap is located between the middle embrace portion and the working tube (1); The secondary pressing mechanism also includes a first connecting piece and a second connecting piece for respectively installing the two vertical plate parts on the orifice tube (15) and the front end of the primary orifice pressing device; The joint assembly comprises a water inlet nozzle (8) mounted on the middle cylinder portion and connected to the outer annular gap (12), a tee pipe (9) mounted on the water inlet nozzle (8), a water inlet valve (16) mounted on one end of the tee pipe (9), and a pressure gauge (11) mounted on a side opening of the tee pipe (9); The other end of the water inlet valve (16) is connected to a pressure pump via a pipeline.

2. The horizontal hole removable packing (4) type hydraulic expansion type two-stage hole clamping device according to claim 1 is characterized in that: The primary orifice clamping device comprises a primary outer sleeve (3), a clamping plug (2) and a third connecting piece for mounting the clamping plug (2) on the primary outer sleeve (3); the packing (4) is arranged in an annular storage space surrounded by the primary outer sleeve (3), the clamping plug (2) and the working pipe (1).

3. The horizontal hole removable packing (4) type hydraulic expansion type two-stage hole clamping device according to claim 1 is characterized in that: It also includes a valve (14) arranged on the orifice tube (15) or between the orifice tube (15) and the secondary clamping mechanism.

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