A replaceable packing type horizontal drilling double-stage hole clamping device

Abstract

The present invention discloses a replaceable packing-type two-stage orifice clamping device for horizontal drilling, comprising a secondary orifice clamping device installed on an orifice pipe and a primary orifice clamping device installed on the secondary orifice clamping device; the secondary orifice clamping device comprises a rubber sleeve sleeved on a working pipe and a secondary clamping mechanism capable of axially compressing the rubber sleeve, an annular gap is provided between the working pipe and the rubber sleeve, the rubber sleeve is axially compressed by the secondary clamping mechanism and then clamps the outer wall of the working pipe to seal the annular gap; the present invention replaces worn packings multiple times under fully controllable conditions to ensure that the horizontal hole continues to be drilled under orifice clamping conditions; the present invention has a simple structure, is easy to process, install and operate, and can be reused multiple times; the present invention is not only convenient to use, but also can completely avoid the risk of sandblasting and water gushing when replacing the packing, and can be widely used in horizontal hole drilling construction in subway construction, municipal engineering and tunnel engineering.

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 replaceable packing type horizontal drilling double-stage hole opening clamping device. Background Art

[0002] With the vigorous development of subway construction, municipal engineering and tunnel engineering in my country, horizontal hole construction technology is widely used. Since horizontal holes are located in subway tunnels, other tunnels or municipal foundation pit projects, and drilling operations are often very risky in water-rich strata with poor geological conditions and pressurized groundwater, orifice devices must be used to prevent the risk of sandblasting and water gushing during drilling. Traditional orifice devices stop water by compressing packing, but as the horizontal drilling extends, the sealing packing is constantly worn by the horizontal drill rod or frozen drill rod. When it is worn to a certain extent, the compressing packing can no longer stop water. Directly replacing the packing in water-rich strata with poor geological conditions and pressurized groundwater is very likely to cause gushing danger; on the other hand, severe soil erosion will also cause serious damage to the tunnel structure itself, and may even cause tunnel settlement and surface collapse, with immeasurable consequences.

[0003] The traditional hole clamping device cannot replace the packing while ensuring construction safety. Therefore, there is an urgent need for a replaceable packing type hole clamping device with simple structure, easy operation, safety, reliability and high efficiency to ensure that the packing can be replaced safely and reliably when the sealing packing is severely worn during horizontal drilling. Summary of the invention

[0004] To this end, the technical problem to be solved by the present invention is to provide a replaceable packing-type two-stage orifice clamping device for horizontal drilling, which has a simple structure, is safe and reliable, is easy to use, and has controllable risks, and can prevent horizontal orifice gushing when changing packing during horizontal drilling.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A replaceable packing type horizontal drilling double-stage orifice clamping device, comprising a secondary orifice clamping device installed on an orifice pipe and a primary orifice clamping device installed on the secondary orifice clamping device;

[0007] The primary orifice clamping device comprises a packing wound on the working pipe and a primary clamping mechanism for clamping the packing, wherein the packing is detachably mounted outside the working pipe;

[0008] The secondary orifice clamping device comprises a rubber sleeve sleeved on the working pipe and a secondary clamping mechanism capable of axially compressing the rubber sleeve, an annular gap is provided between the working pipe and the rubber sleeve, and the rubber sleeve is axially compressed by the secondary clamping mechanism and then tightly holds the outer wall of the working pipe to seal the annular gap;

[0009] The first-level orifice clamping device is similar to the traditional orifice clamping device, which plays the role of sealing the outer peripheral gap of the working pipe and preventing water and sand gushing; the second-level orifice clamping device is a protective and sealing device when replacing the packing in the first-level orifice clamping device.

[0010] 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, and the secondary clamping mechanism realizes axial compression of the rubber sleeve by shortening the distance between the two annular plate portions.

[0011] Furthermore, the secondary clamping mechanism includes a telescopic sleeve, an adjustment component for limiting the length of the telescopic sleeve, a first connecting piece for connecting the telescopic sleeve to the orifice tube, and a second connecting piece for connecting the telescopic sleeve to the clamping mechanism, and the annular plate portion of the rubber sleeve is clamped between the front end of the telescopic sleeve and the head end of the orifice tube, and between the rear end of the telescopic sleeve and the primary clamping mechanism.

[0012] Furthermore, the telescopic sleeve includes an inner tube, an outer tube, a first vertical plate connected to the inner tube, and a second vertical plate connected to the outer tube. The adjacent ends of the inner tube and the outer tube are overlapped, the first vertical plate and the second vertical plate are respectively arranged at the opposite ends of the inner tube and the outer tube, and the adjustment component is arranged on the first vertical plate and the second vertical plate to adjust the distance between the first vertical plate and the second vertical plate.

[0013] Furthermore, the inner tube is connected to the inner edge of the first vertical plate, and the outer tube is connected to the second vertical plate near the inner edge of the second vertical plate, and has an accommodation distance from the inner edge of the first vertical plate. The accommodation distance matches the thickness of the front end of the inner tube, so that the inner wall of the second vertical plate can be flush with the inner wall of the inner tube.

[0014] Furthermore, the first-level clamping mechanism includes an outer sleeve and a clamping plug installed on the rear side of the outer sleeve through a third connecting piece, the outer sleeve includes a front tube, a third vertical plate connected to the front end of the front tube and a fourth vertical plate connected to the rear end of the front tube, the clamping plug is installed on the fourth vertical plate through the third connecting piece and the front end of the clamping plug is located in the front tube, and the third vertical plate is installed on the telescopic sleeve through the second connecting piece; the packing is arranged in an annular space surrounded by the front tube, the third vertical plate, the front end face of the clamping plug and the working tube.

[0015] Furthermore, a middle flange is provided between the telescopic sleeve and the clamping mechanism, and the annular plate portion at the rear end of the rubber sleeve is clamped by the middle flange and the telescopic sleeve.

[0016] Furthermore, the replaceable packing-type horizontal drilling two-stage orifice clamping device also includes a valve arranged on the orifice pipe or between the orifice pipe and the secondary clamping mechanism.

[0017] The technical solution of the present invention achieves the following beneficial technical effects:

[0018] The present invention replaces worn packing multiple times under fully controllable conditions, ensuring that the horizontal hole continues 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 can be reused many times; the invention is not only easy to use, but also can completely avoid the risk of sandblasting and water gushing when replacing the packing, 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 Schematic diagram of the structure of a rubber sleeve according to an embodiment of the present invention.

[0024] The reference numerals in the figure are represented as: 1-working pipe, 2-compression plug, 3-outer sleeve, 4-packing, 5-rubber sleeve, 6-outer compression sleeve, 7-inner compression sleeve, 8-adjusting bolt, 9-orifice pipe, 10-valve, 11-first bolt, 12-second bolt, 13-third bolt, 14-middle flange, 15-bypass pipe, 16-ball valve, 17-fourth vertical plate. 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 4As shown, a replaceable packing type horizontal drilling two-stage orifice clamping device comprises a secondary orifice clamping device installed on an orifice pipe 9, a valve 10 and a primary orifice clamping device installed on the secondary orifice clamping device; the orifice pipe 9 is a conventional technology, and the orifice pipe 9 is fixed on a tunnel pipe segment or a foundation pit; the valve 10 is arranged on the orifice pipe 9 or between the orifice pipe 9 and the secondary clamping mechanism through a bypass pipe, preferably, the valve 10 is connected to the orifice pipe 9 and the secondary clamping mechanism through a flange, that is, the valve 10 is connected to the rear end of the orifice pipe 9 through a flange, and the valve 10 is closed after all the working pipes are taken out, so as to play the role of orifice water stopping and blowout prevention; in addition, a bypass pipe 15 and a ball valve 16 for pressure relief are also arranged on the orifice pipe 9, and the bypass pipe 15 and the ball valve 16 serve as a primary blowout prevention and diversion device;

[0027] The primary orifice clamping device comprises a packing 4 wound on the working pipe 1 and a primary clamping mechanism for clamping the packing 4. The packing 4 is detachably mounted outside the working pipe 1. The packing 4 is mounted using a commonly used clamping principle in the prior art.

[0028] The secondary orifice clamping device comprises a rubber sleeve 5 sleeved on the working tube 1 and a secondary clamping mechanism capable of axially compressing the rubber sleeve 5. An annular gap is provided between the working tube 1 and the rubber sleeve 5. The rubber sleeve 5 is axially compressed by the secondary clamping mechanism and then tightly holds the outer wall of the working tube 1 to seal the annular gap.

[0029] The working pipe 1 is a horizontal drill pipe or a frozen drill pipe; the first-level hole clamping device is similar to a traditional hole clamping device, which plays a role in sealing the peripheral gap of the working pipe 1 and preventing water and sand from gushing out; the second-level hole clamping device is a protection and sealing device when replacing the packing 4 in the first-level hole clamping device; during the horizontal drilling process, when the packing 4 in the first-level hole clamping device is severely worn, the packing 4 can be replaced at any time; the packing 4 generally adopts a packing rope soaked in butter pure cotton yarn butter oil;

[0030] During conventional horizontal drilling, the first-level orifice clamping device is in a clamping state, performing a water-stopping function, the second-level orifice clamping device is in a relaxed state, and the working pipe 1 basically rotates hollowly in the rubber sleeve 5; when the packing 4 is replaced, the second-level clamping mechanism is compressed so that the rubber sleeve 5 is tightly attached to the working pipe 1, thereby performing a water-stopping function; the present invention is a orifice blowout protection device sleeved on a horizontal drill rod to ensure that no water spraying or sand gushing occurs during horizontal hole drilling, and when the packing 4 is severely worn, the packing 4 can be safely replaced; the present invention achieves controllable risks when replacing the packing 4, and at the same time, the device is simple to process and can be reused, which reduces costs and is easy to promote and apply.

[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 secondary clamping mechanism realizes axial compression of the rubber sleeve 5 by shortening the distance between the two annular plate portions, so that the rubber sleeve 5 tightly embraces the outer wall of the horizontal drill pipe, thereby playing a water-stopping role and ensuring that sandblasting and water spraying will not occur; the inner diameter of the rubber sleeve 5 in a natural state is larger than the outer diameter of the working pipe 1, and the outer diameter of the rubber sleeve 5 is smaller than the minimum inner diameter of the telescopic sleeve, and an annular gap can be formed between the rubber sleeve 5 and the working pipe 1, and between the rubber sleeve 5 and the telescopic sleeve, providing space for the deformation of the rubber sleeve 5; the rubber sleeve 5 is similar to the KXT-2 type rubber flexible joint in the prior art, and the biggest difference is that the middle embrace portion of the rubber sleeve 5 in this application is a straight cylindrical type; specifically, the rubber sleeve 5 in this application can withstand a pressure of 1.6MPa, and the thickness of the middle embrace portion is not less than 12mm.

[0032] Further, such as Figures 1 to 3 As shown, the secondary clamping mechanism includes a telescopic sleeve, an adjustment component for limiting the length of the telescopic sleeve, a first connecting member for connecting the telescopic sleeve to the orifice pipe 9, and a second connecting member for connecting the telescopic sleeve to the clamping mechanism. The first connecting member and the second connecting member can be bolts and nuts. To distinguish them, the first connecting member and the second connecting member are respectively marked as a first bolt 11 and a second bolt 12;

[0033] The annular plate portion of the rubber sleeve 5 is clamped between the front end of the telescopic sleeve and the head end of the orifice tube 9, and between the rear end of the telescopic sleeve and the primary clamping mechanism; after the first connecting member and the second connecting member are installed and adjusted, they do not need to be disassembled during normal use, and the first connecting member and the second connecting member can use common fasteners such as bolts and screws.

[0034] Further, such as Figures 1 to 3 As shown, the telescopic sleeve comprises an inner tube, an outer tube, a first vertical plate connected to the inner tube and a second vertical plate connected to the outer tube. The proximal ends of the inner tube and the outer tube are overlapped, the inner tube and the first vertical plate are welded together as an inner compression sleeve 7, the outer tube and the second vertical plate are welded together as an outer compression sleeve 6, the first vertical plate and the second vertical plate are equivalent to flanges, and the inner tube and the outer tube are both made of seamless steel pipes;

[0035] The first vertical plate and the second vertical plate are respectively arranged at the opposite ends of the inner tube and the outer tube, and the adjustment component is arranged on the first vertical plate and the second vertical plate to adjust the distance between the first vertical plate and the second vertical plate; specifically, the adjustment component adopts an adjustment bolt 8 and a nut matched therewith, and when performing a water-stopping operation, the axial distance between the first vertical plate and the second vertical plate is shortened by tightening the adjustment bolt 8, and the rubber sleeve 5 is compressed in the axial direction, thereby compressing the rubber sleeve 5 located between the working tube 1 and the telescopic sleeve, so that the rubber sleeve 5 produces axial compression and radial stretching deformation, and the radial stretching deformation of the rubber sleeve 5 seals the gap between the rubber sleeve 5 and the horizontal drill rod, thereby achieving a water-stopping effect and ensuring that sandblasting and water spraying will not occur; in addition to the adjustment bolt 8, the adjustment component can also adopt cable ties and other components that can adjust the positions of the first vertical plate and the second vertical plate;

[0036] Specifically, before replacing the packing 4, stop the horizontal drilling work; tighten the adjusting bolt 8 of the secondary orifice clamping device to put the rubber sleeve 5 in a sealed and water-stopping state; under the protection of the secondary orifice clamping device, remove the clamping plug 2 and the old packing of the primary orifice clamping device, and replace with a new packing; then reinstall the clamping plug 2 and tighten the third bolt 13 to put the primary orifice clamping device in a sealed and water-stopping state; then loosen the adjusting bolt 8 of the secondary orifice device to release the axial compression on the rubber sleeve 5, so that the rubber sleeve 5 is in a relaxed state, and the radial deformation of the rubber sleeve 5 disappears, thereby causing the rubber sleeve 5 to detach from the horizontal drill rod and no longer have a water-stopping function; then continue the horizontal drilling work.

[0037] Furthermore, the inner tube is connected to the inner edge of the first vertical plate, and the outer tube is connected to the second vertical plate near the inner edge of the second vertical plate, and has an accommodation distance from the inner edge of the first vertical plate. The accommodation distance matches the thickness of the front end of the inner tube, so that the inner wall of the second vertical plate can be flush with the inner wall of the inner tube.

[0038] Further, such as Figures 1 to 3As shown, the primary clamping mechanism includes an outer sleeve 3 and a clamping plug 2 installed on the rear side of the outer sleeve 3 through a third connecting piece (i.e., a third bolt 13); the clamping plug 2 includes an end ring connected to the inner side of the front end of the intermediate steel pipe by an intermediate steel pipe and a flange connected to the rear end of the intermediate steel pipe, the intermediate steel pipe is a seamless steel pipe, the outer sleeve 3 includes a front pipe, a third vertical plate connected to the front end of the front pipe and a fourth vertical plate 17 connected to the rear end of the front pipe, the clamping plug 2 is installed on the fourth vertical plate 17 through the third connecting piece and the front end of the clamping plug 2 is located in the front pipe, the third vertical plate is connected to the front end of the intermediate steel pipe by the second connecting piece Installed on the telescopic sleeve; the packing 4 is arranged in the annular space surrounded by the front tube, the third vertical plate, the front end face of the compression plug 2, and the working tube 1, and the packing 4 is wound along the outer diameter of the working tube 1 and is fully compressed and compressed in the annular space by the compression plug 2. By compressing and deforming the packing 4, the gap between the working tube 1 and the outer sleeve 3 is sealed to play a water-stopping role; the third connecting member can be a bolt and a nut matched therewith, and the bolt is recorded as a third bolt 13. By tightening the third bolt 13, the degree of compression of the compression plug 2 on the packing 4 can be adjusted, so that the packing 4 is in a compressed state to maintain the water-stopping effect;

[0039] Specifically, during actual use, as the working pipe 1 is continuously extended, the packing 4 is continuously worn, and the third bolt 13 needs to be continuously tightened, so that the front end of the compression plug 2 continues to compress the packing 4 and continues to maintain the sealing state; the wear of the packing 4 continues to increase, and when the wear reaches a certain level, even if the third bolt 13 is tightened again, the worn packing 4 cannot play a sealing and water-stopping role. At this time, in order to ensure that the drilling hole does not produce the risk of sandblasting and water gushing, new packing must be replaced; when replacing the packing, it is carried out under the protection of the secondary hole clamping device.

[0040] Furthermore, a middle flange 14 is provided between the telescopic sleeve and the primary clamping mechanism, and the annular plate portion at the rear end of the rubber sleeve 5 is clamped by the middle flange 14 and the telescopic sleeve.

[0041] The working process of the present invention is as follows:

[0042] When the horizontal hole is drilled normally, the first-level hole mouth clamping device is in a clamping state, and as the horizontal hole is continuously extended, the third connecting piece needs to be continuously tightened so that the clamping plug 2 is tightly against the packing 4, so that the packing 4 tightly seals the gap between the outer casing 3 and the horizontal drill rod to play a water-stopping function; as the drilling time increases, the wear degree of the packing 4 continues to increase. When it reaches a certain degree, even if the third connecting piece is tightened, it cannot completely stop the water, and water spraying and sand gushing will occur at the hole mouth. At this time, the packing 4 must be replaced;

[0043] Before replacing the packing 4, first tighten the adjustment component of the secondary orifice clamping device to make the secondary orifice clamping device play a water-stopping role; specifically, remove the third connecting piece, the clamping plug 2 and the remaining packing 4 of the primary orifice clamping device; install the new packing 4 in the outer sleeve 3, install the clamping plug 2 and the third connecting piece; finally tighten the third connecting piece, compress the packing 4, so that the primary orifice clamping device is in a clamping state and performs the water-stopping function;

[0044] After the new packing is replaced, loosen the adjusting bolt 8 to loosen the rubber sleeve 5, so that the rubber sleeve 5 in the secondary hole clamping device is in a relaxed state; start the mud pump, start the horizontal drilling rig, and start normal horizontal hole drilling work.

[0045] 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 replaceable packing type horizontal drilling double-stage hole clamping device, characterized in that: It comprises a secondary orifice clamping device installed on the orifice pipe (9) and a primary orifice clamping device installed on the secondary orifice clamping device; The primary orifice pressing device comprises a packing (4) wound around the working pipe (1) and a primary pressing mechanism for pressing the packing (4); The secondary orifice pressing device comprises a rubber sleeve (5) sleeved on the working tube (1) and a secondary pressing mechanism capable of axially compressing the rubber sleeve (5), an annular gap being provided between the working tube (1) and the rubber sleeve (5), the rubber sleeve (5) being axially compressed by the secondary pressing mechanism to hold the outer wall of the working tube (1) and seal the annular gap; 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, and the secondary pressing mechanism achieves axial compression of the rubber sleeve (5) by shortening the distance between the two annular plate portions; The secondary clamping mechanism comprises a telescopic sleeve, an adjustment component for limiting the length of the telescopic sleeve, a first connecting piece for connecting the telescopic sleeve to the orifice tube (9), and a second connecting piece for connecting the telescopic sleeve to the primary clamping mechanism, the annular plate portion of the rubber sleeve (5) being clamped between the front end of the telescopic sleeve and the head end of the orifice tube (9), and between the rear end of the telescopic sleeve and the primary clamping mechanism; The telescopic sleeve comprises an inner tube, an outer tube, a first vertical plate connected to the inner tube, and a second vertical plate connected to the outer tube, the proximal ends of the inner tube and the outer tube are overlapped, the first vertical plate and the second vertical plate are respectively arranged at the opposite ends of the inner tube and the outer tube, and the adjustment component is arranged on the first vertical plate and the second vertical plate to adjust the distance between the first vertical plate and the second vertical plate; The inner tube is connected to the inner edge of the first vertical plate, and the outer tube is connected to the second vertical plate near the inner edge of the second vertical plate, and has an accommodation distance from the inner edge of the first vertical plate, and the accommodation distance matches the thickness of the front end of the inner tube, so that the inner wall of the second vertical plate can be flush with the inner wall of the inner tube; The primary clamping mechanism comprises an outer sleeve (3) and a clamping plug (2) mounted on the rear side of the outer sleeve (3) via a third connecting piece, the outer sleeve (3) comprising a front tube, a third vertical plate connected to the front end of the front tube, and a fourth vertical plate connected to the rear end of the front tube, the clamping plug (2) being mounted on the fourth vertical plate via the third connecting piece and the front end of the clamping plug (2) being located inside the front tube, the third vertical plate being mounted on the telescopic sleeve via a second connecting piece; the packing (4) being arranged in an annular space surrounded by the front tube, the third vertical plate, the front end surface of the clamping plug (2), and the working tube (1).

2. The replaceable packing type horizontal drilling two-stage hole clamping device according to claim 1 is characterized in that: A middle flange (14) is provided between the telescopic sleeve and the primary clamping mechanism, and the annular plate portion at the rear end of the rubber sleeve (5) is clamped by the middle flange (14) and the telescopic sleeve.

3. The replaceable packing type horizontal drilling two-stage hole clamping device according to claim 1 is characterized in that: It also includes a valve (10) arranged on the orifice tube (9) or arranged between the orifice tube (9) and the secondary pressing mechanism.

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