CN216553864U

CN216553864U - Two-block two-injection pipe direct-connection hole packer

Info

Publication number: CN216553864U
Application number: CN202123430472.5U
Authority: CN
Inventors: 张志勇; 王召龙
Original assignee: Hebei Dongrui Tianhe Plastic Product Co ltd
Current assignee: Hebei Dongrui Tianhe Plastic Product Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-05-17
Anticipated expiration: 2031-12-30

Abstract

The utility model provides a two-plug two-injection through pipe direct-connection hole packer, which belongs to the technical field of coal mine accessories and comprises a through pipe, two elastic bags, two feeding pipes, a discharging pipe and a supporting plate, wherein the two elastic bags are arranged on the through pipe; the air pipe is arranged in the drill hole and penetrates through the two elastic bag bodies, a positioning rod is arranged between the two elastic bag bodies, a first feed port and two second feed ports are arranged on the feed pipe, and the other end of the feed pipe is positioned outside the drill hole and is connected with the grouting pump; the discharging pipe is located the top of breather pipe, and the discharging pipe passes two elastic bag bags, is equipped with the discharge gate on the discharging pipe, and the drill way department of backup pad closing cap drilling, and with mine wall fixed connection, be equipped with the mounting hole in the backup pad, one side of backup pad is equipped with the bellying, and the mounting hole runs through backup pad and bellying. The two-plugging two-injection-through pipe direct-connection hole packer provided by the utility model improves the installation efficiency of the hole packer; guarantee that the breather pipe is accurately installed in the drilling, improved the installation accuracy.

Description

Two-block two-injection pipe direct-connection hole packer

Technical Field

The utility model belongs to the technical field of coal mine accessories, and particularly relates to a two-block two-injection-pipe direct-connection hole packer.

Background

With the continuous development of coal mining technology, the mining depth is continuously increased, the gas pressure and the gas content of a coal bed are continuously increased, and the potential safety hazard is relatively large; the coal mine gas extraction adopts drilling in a coal seam and a gas gathering area, the drill hole is connected to a special pipeline, and gas in the coal seam and a goaf is extracted to the ground by extraction equipment and is utilized.

When gas is extracted, a drill hole needs to be plugged when the pumping and releasing pipe is installed in the drill hole, at present, a plurality of elastic bags are installed on the pumping and releasing pipe during installation, and the pumping and releasing pipe and the elastic bags are installed in the drill hole together; then filling materials such as slurry and the like into the elastic bag, and further plugging the drilled hole; the plugging mode has the disadvantages of low material filling speed, low installation efficiency and poor installation accuracy.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a two-piece two-injection-pipe direct-connection hole packer to solve the technical problems of low installation efficiency and poor installation accuracy caused by low slurry filling speed in the prior art.

In order to achieve the purpose, the utility model adopts the technical scheme that: the two-plug two-injection-pipe direct-connection hole packer comprises a vent pipe, two elastic bags, two feed pipes, a discharge pipe and a support plate; the breather pipe is used for being installed in a drill hole; one end of the vent pipe extends inwards along the length direction of the drill hole, and the other end of the vent pipe is positioned outside the drill hole; the elastic bag is of a hollow structure; an accommodating space is arranged between the two elastic bags; the vent pipe penetrates through the two elastic bags and is connected with the two elastic bags in a sealing way; a positioning rod is arranged between the two elastic bags; the feeding pipe is positioned below the vent pipe; the two feeding pipes penetrate through the two elastic bags and are connected with the two elastic bags in a sealing manner; the feeding pipe is provided with a first feeding hole and two second feeding holes; the first feed inlets are arranged in the accommodating space, and the two second feed inlets are respectively arranged in the two elastic bag bags; one end of the feeding pipe, which is positioned in the drill hole, is provided with a blocking head, and the other end of the feeding pipe, which is positioned outside the drill hole, is connected with a grouting pump; the discharge pipe is positioned above the vent pipe, penetrates through the two elastic bags and is in sealed connection with the two elastic bags; a discharge hole positioned in the accommodating space is formed in the discharge pipe, and a plugging head is arranged at one end of the discharge pipe positioned in the drill hole; the supporting plate is used for sealing the orifice of the drilled hole and is fixedly connected with the mine wall; the supporting plate is provided with a mounting hole communicated with the drilling hole; a bulge part positioned in the drill hole is arranged on one side of the supporting plate, and the mounting hole penetrates through the supporting plate and the bulge part; the supporting plate is also provided with a through hole for the feeding pipe and the discharging pipe to pass through.

In a possible implementation manner, a safety valve is arranged on the first feeding hole, and one-way valves are arranged on the two second feeding holes.

In a possible implementation manner, the discharge holes are uniformly distributed on the discharge pipe; each all be equipped with vertical pipe on the discharge gate, vertical pipe is kept away from the one end of discharging pipe upwards extends, and is close to the top of drilling.

In a possible implementation mode, the supporting plate is provided with a plurality of uniformly distributed connecting holes, and the supporting plate is fixed on the mine shaft wall through bolts penetrating through the connecting holes.

In a possible implementation manner, the protruding portion and the support plate are integrally formed, and a sealing groove arranged around the protruding portion and a sealing ring arranged in the sealing groove are arranged on the support plate; the sum of the thicknesses of the support plate and the raised portion is one tenth to one fifth of the length of the vent tube.

In one possible implementation, the vent pipe is slidably connected with the mounting hole; be equipped with external screw thread section and threaded connection on the breather pipe in nut on the external screw thread section is used for locking fixedly the breather pipe with the backup pad.

In one possible embodiment, a third valve is provided on the section of the tapping pipe outside the borehole.

In a possible implementation manner, a pressure gauge is arranged on the pipe section of the feeding pipe outside the drilled hole.

In a possible implementation manner, the vent pipe comprises two connecting pipe sections, and the two connecting pipe sections are detachably connected; the two connecting pipe sections respectively penetrate through the two elastic bags.

In one possible implementation, a slurry separation layer is provided on the outer side of the elastic bladder.

The two-piece two-injection through pipe direct-connection hole packer provided by the utility model has the beneficial effects that: compared with the prior art, the two-piece two-injection-pipe direct-connection hole packer has the advantages that when the hole packer is used, the vent pipe, the two feeding pipes and the discharging pipe are installed on the two elastic bags, the supporting plate is sleeved on the vent pipe and then installed in a drilled hole together, the supporting plate is fixed on a mine well wall, the vent pipe is accurately positioned at the center of the drilled hole under the support of the supporting plate and the protruding part, and the two elastic bags are connected through the positioning rod to be connected into a whole; then, filling the slurry into the two feeding pipes, wherein the slurry enters the two elastic bag bags from the second feeding hole, so that the elastic bag gradually expands into a columnar shape and is tightly attached to the hole wall of the drilled hole to plug the drilled hole, and the slurry enters the hole sealing section of the drilled hole from the first feeding hole and is filled in the hole sealing section; gas in the drill hole is discharged from a discharge hole of the discharge pipe, and then enters the discharge pipe after the drill hole is filled with slurry to complete the comprehensive blocking of the drill hole; by the mode, the two feeding pipes are used for simultaneously filling the slurry into the two elastic bags, so that the installation efficiency of the hole packer is improved; the ventilation pipe is supported in the mounting holes of the supporting plate and the protruding portion, and the supporting plate is fixed on the mine shaft wall, so that the ventilation pipe is accurately mounted in the drill hole, and mounting accuracy is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a two-injection-pipe direct-connection hole packer provided in an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the connection between the vent tube, the flexible bladder and the feed tube provided in accordance with an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a support plate according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

1. a breather pipe; 11. a nut; 12. a flange plate; 2. an elastic bag; 21. an accommodating space; 22. positioning a rod; 3. a feed pipe; 31. a first feed port; 32. a second feed port; 33. plugging a plug; 34. a safety valve; 35. a one-way valve; 36. a pressure gauge; 4. a discharge pipe; 41. a discharge port; 42. a vertical tube; 43. a third valve; 5. a support plate; 51. mounting holes; 52. a boss portion; 53. a through hole; 54. connecting holes; 55. a bolt; 56. a seal ring; 57. sealing the groove; 6. a mine wall; 61. and (6) drilling.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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 the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 to fig. 3, the two-piece two-injection-pipe direct-connection hole packer provided by the present invention will now be described. A two-plug two-injection-pipe direct-connection hole packer comprises a vent pipe 1, two elastic bags 2, two feed pipes 3, a discharge pipe 4 and a support plate 5; snorkel 1 is for installation in borehole 61; one end of the breather pipe 1 extends inwards along the length direction of the drill hole 61, and the other end is positioned outside the drill hole 61; the elastic bag 2 is of a hollow structure; an accommodating space 21 is arranged between the two elastic bags 2; the vent pipe 1 penetrates through the two elastic bags 2 and is connected with the two elastic bags 2 in a sealing way; a positioning rod 22 is arranged between the two elastic bags 2; the feeding pipe 3 is positioned below the vent pipe 1; the two feeding pipes 3 penetrate through the two elastic bags 2 and are hermetically connected with the two elastic bags 2; the feeding pipe 3 is provided with a first feeding hole 31 and two second feeding holes 32; the first feed port 31 is arranged in the accommodating space 21, and the two second feed ports 32 are respectively arranged in the two elastic bag bodies 2; one end of the feeding pipe 3, which is positioned in the drill hole 61, is provided with a blocking head 33, and the other end of the feeding pipe is positioned outside the drill hole 61 and is connected with a grouting pump; the discharge pipe 4 is positioned above the vent pipe 1, and the discharge pipe 4 penetrates through the two elastic bags 2 and is hermetically connected with the two elastic bags 2; a discharge hole 41 positioned in the accommodating space 21 is formed in the discharge pipe 4, and a plugging head 33 is arranged at one end of the discharge pipe 4 positioned in the drill hole 61; the supporting plate 5 is used for covering the hole opening of the drilling hole 61 and is fixedly connected with the mine wall 6; the supporting plate 5 is provided with a mounting hole 51 communicated with the drill hole 61; one side of the supporting plate 5 is provided with a convex part 52 positioned in the drilling hole 61, and the mounting hole 51 penetrates through the supporting plate 5 and the convex part 52; the supporting plate 5 is also provided with a through hole 53 for the feed pipe 3 and the discharge pipe 4 to pass through.

Compared with the prior art, the two-plug two-injection-pipe direct-connection hole packer has the advantages that when the two-plug two-injection-pipe direct-connection hole packer is used, the vent pipe 1, the two feed pipes 3 and the discharge pipe 4 are installed on the two elastic bags 2, the support plate 5 is sleeved on the vent pipe 1 and then installed in the drill hole 61 together, the support plate 5 is fixed on the mine well wall 6, the vent pipe 1 is accurately positioned at the center of the drill hole 61 under the support of the support plate 5 and the bulge 52, and the two elastic bags 2 are connected through the positioning rod 22, so that the elastic bags 2 are connected into a whole; then, the two feeding pipes 3 are filled with slurry, the slurry enters the two elastic bag bags 2 from the second feeding hole 32, so that the elastic bag 2 gradually expands into a columnar shape and is tightly attached to the wall of the drill hole 61 to close the drill hole 61, and the slurry enters the hole sealing section of the drill hole 61 from the first feeding hole 31 and is filled in the hole sealing section; discharging gas in the drill hole 61 from a discharge hole 41 of the discharge pipe 4, and then filling the drill hole 61 with slurry and then feeding the slurry into the discharge pipe 4 to complete the complete sealing of the drill hole 61; in this way, the two feeding pipes 3 are used for simultaneously filling the slurry into the two elastic bags 2, so that the mounting efficiency of the hole packer is improved; by means of the ventilation pipe 1 supported in the mounting holes 51 of the supporting plate 5 and the protruding part 52, and the supporting plate 5 fixed on the mine shaft wall 6, the ventilation pipe 1 is guaranteed to be accurately mounted in the drilling hole 61, and mounting accuracy is improved.

When the installation is carried out, the installation hole 51 is arranged coaxially with the drill hole 61, and the installation hole 51 with a certain length is formed by the support plate 5 and the protruding part 52, so that after the air vent pipe 1 is installed in the installation hole 51, the support plate 5 is fixed on the mine shaft wall 6, and the air vent pipe 1 can be stably supported. Both ends of the elastic bag 2 are provided with clamps which are fixedly connected with the vent pipe 1.

Referring to fig. 1, as a specific embodiment of the two-piece two-injection-pipe direct-connection hole packer provided by the present invention, a safety valve 34 is disposed on the first feed port 31, a one-way valve 35 is disposed on each of the two second feed ports 32, and the safety valve 34 is disposed on the first feed port 31, so that slurry enters the feed pipe 3 through the one-way valve 35 on the second feed port 32 and enters the elastic bag 2; after the elastic bag 2 gradually expands into a column shape, the elastic bag 2 is tightly attached to the wall of the drill hole 61 to block the drill hole 61, the safety valve 34 in the accommodating space 21 is burst to form slurry overflow due to the pressure of the elastic bag 2, and the slurry is injected into the hole blocking section to discharge the gas in the drill hole 61 through the discharge pipe 4 until the holes in the drill hole 61 are completely filled and sealed by the slurry. The drilling hole 61 is sealed by the elastic bag 2 and the grout, and the vent pipe 1 is tightly sleeved and fixed by the elastic bag 2 and the grout, so that the position is not changed.

Referring to fig. 1, as a specific embodiment of the two-piece two-injection-pipe direct-connection hole packer provided in the present invention, a plurality of discharge ports 41 are uniformly distributed on the discharge pipe 4; each discharge hole 41 is provided with a vertical pipe 42, and one end of each vertical pipe 42, which is far away from the discharge pipe 4, extends upwards and is close to the top of the drill hole 61; a plurality of discharge holes 41 are arranged, so that air and slurry in the drill hole 61 can enter the discharge pipe 4 more smoothly and quickly; even if part of the discharge holes 41 or the vertical pipes 42 are blocked, other discharge holes 41 or the vertical pipes 42 can discharge gas and slurry into the discharge pipe 4, so that the working reliability of the two-piece two-injection-pipe direct-connection hole packer is improved. And the upper end of the vertical pipe 42 extends upwards and is close to the top of the drill hole 61, so that the air in the drill hole 61 can be almost completely discharged, the slurry can be almost completely distributed in the drill hole 61, and the hole sealing effect of the two-way injection pipe direct-connected hole sealing device on the drill hole 61 is improved.

Referring to fig. 1 to 3, as a specific embodiment of the two-injection-pipe direct-connection hole packer provided by the present invention, a plurality of connection holes 54 are uniformly distributed on a support plate 5, and the support plate 5 is fixed on a mine shaft wall 6 by bolts 55 passing through the connection holes 54; after the vent pipe 1 passes through the mounting hole 51 on the supporting plate 5 and is connected with the elastic bag 2 and is mounted in the drill hole 61, the supporting plate 5 is attached to the mine shaft wall 6, then a plurality of bolts 55 are used for passing through the connecting holes 54 on the supporting plate 5 and are fixed on the mine shaft wall 6, and then the supporting plate 5 is fixedly connected on the mine shaft wall 6. Evenly set up and fix backup pad 5 on the wall of a mine 6 through a plurality of bolts 55, improved backup pad 5's installation stability, firmness.

Referring to fig. 1 to 3, as a specific embodiment of the two-piece two-injection-pipe direct-connection hole packer provided by the present invention, a protruding portion 52 and a supporting plate 5 are integrally formed, and the supporting plate 5 is provided with a sealing groove 57 disposed around the protruding portion 52 and a sealing ring 56 disposed in the sealing groove 57; the sum of the thicknesses of the supporting plate 5 and the convex part 52 is one tenth to one fifth of the length of the breather pipe 1; the integrally formed convex part 52 and the supporting plate 5 improve the connection strength between the two, and ensure that the convex part 52 can stably and reliably support the vent pipe 1. And the side of the support plate 5 close to the mine arm is provided with a sealing groove 57, and a sealing ring 56 is arranged in the sealing groove 57, so that the support plate 5 is connected to the mine arm in a sealing way, and when the hole sealing is not tight due to an accident, no gas leaks out. Meanwhile, the sum of the thicknesses of the supporting plate 5 and the protruding part 52 is set, namely the depth of the mounting hole 51 is one tenth to one fifth of the length of the breather pipe 1, so that the effective supporting length of the breather pipe 1 is longer, and the breather pipe can be stably and accurately mounted in the drill hole 61.

Referring to fig. 2, as a specific embodiment of the two-piece two-vent-pipe direct-connection hole packer provided in the present invention, a vent pipe 1 is slidably connected to a mounting hole 51; the vent pipe 1 is provided with an external thread section and a nut 11 which is in threaded connection with the external thread section and is used for locking and fixing the vent pipe 1 and the support plate 5; through the mode of sliding connection, make the position of staff's convenient operation breather pipe 1 in drilling 61, after adjusting the definite position, operating nut 11 is rotatory at the external screw thread section of breather pipe 1, makes breather pipe 1 lock fix on backup pad 5.

Referring to fig. 1, as a specific embodiment of the two-piece two-injection-pipe direct-connection hole packer provided in the present invention, a third valve 43 is disposed on a pipe section of the discharge pipe 4 outside the borehole 61; the third valve 43 is a gate valve or a ball valve, and is used for closing the end of the discharge pipe 4, so as to form a closed channel with the feed pipe 3, the drill hole 61 and the discharge pipe 4, thereby realizing high-pressure grouting sealing in the drill hole 61.

The specific operation mode is as follows: opening the third valve 43, adding slurry into the elastic bag 2 and the drill hole 61 through the grouting pump and the feeding pipe 3, and discharging air and slurry in the drill hole 61 from the discharging pipe 4 in sequence; when the slurry is discharged from the discharge pipe 4, the operator closes the third valve 43 to close the discharge pipe 4, and continues to add the slurry into the bore hole 61 to perform the high-pressure grouting operation. When the grouting pressure reaches 2.0MPa, the grout can be pressed into cracks on the wall of the drill hole 61, the cracks around the drill hole 61 are sealed, the permeability of the grout is reduced, and the effect of plugging a gas leakage channel is achieved.

Referring to fig. 1, as a specific embodiment of the two-piece two-injection-pipe direct-connection hole packer provided by the present invention, a pressure gauge 36 is disposed on a pipe section of the feeding pipe 3 located outside the drill hole 61; and a pressure gauge 36 is arranged at one end of the feed pipe 3 close to the grouting pump and used for monitoring the pressure of the grout in the feed pipe 3, so that the grout with enough pressure in the feed pipe 3 can be filled into the elastic bag 2 and the drill hole 61, and the grouting operation is ensured to be smoothly and reliably completed. Meanwhile, an alarm connected with the pressure gauge 36 is arranged, and when the pressure gauge 36 monitors that the pressure in the feeding pipe 3 is greater than a set value, the alarm is triggered to give an alarm to prompt a worker to pay attention.

Referring to fig. 1 and fig. 2, as a specific embodiment of the two-piece two-injection-pipe direct-connection hole packer provided by the present invention, a vent pipe 1 includes two connecting pipe sections, and the two connecting pipe sections are detachably connected; the two connecting pipe sections respectively penetrate through the two elastic bags 2; in order to reduce the length of the whole hole packer and facilitate the transportation of the hole packer by workers, the vent pipe 1 comprises two connecting pipe sections, and the two connecting pipe sections are connected through the flange 12 or in a threaded connection mode, so that the sealing and reliable connection between the two connecting pipe sections can be achieved, the two connecting pipe sections can be conveniently detached when the hole packer is not used for gas extraction, and the total length of the hole packer is reduced. And after the disassembled hole packer is transported to a working position, connecting the two connecting pipe sections.

Referring to fig. 1, as a specific embodiment of the two-piece two-injection-pipe direct-connection hole packer provided by the present invention, a slurry separation layer is disposed on an outer side surface of an elastic bag 2; a layer of slurry separation layer is adhered to the outer side face of the elastic bag 2 and is used for being in contact with the inner wall of the drill hole 61 in a bonding mode, after slurry is added into the drill hole 61, the slurry is in contact with the slurry separation layer, the slurry separation layer can effectively separate moisture and air in the slurry, and the plugging effect of the drill hole 61 is tight and firm; so that the elastic bag 2 can effectively support the drill hole 61 after grouting.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-plug two-injection-pipe direct-connection hole packer comprises a vent pipe, two elastic bags, two feeding pipes, a discharging pipe and a supporting plate; the breather pipe is used for being installed in a drill hole; one end of the vent pipe extends inwards along the length direction of the drill hole, and the other end of the vent pipe is positioned outside the drill hole; the elastic bag is of a hollow structure; an accommodating space is arranged between the two elastic bags; the vent pipe penetrates through the two elastic bags and is connected with the two elastic bags in a sealing way; a positioning rod is arranged between the two elastic bags; the feeding pipe is positioned below the vent pipe; the two feeding pipes penetrate through the two elastic bags and are connected with the two elastic bags in a sealing manner; the feeding pipe is provided with a first feeding hole and two second feeding holes; the first feed inlets are arranged in the accommodating space, and the two second feed inlets are respectively arranged in the two elastic bag bags; one end of the feeding pipe, which is positioned in the drill hole, is provided with a blocking head, and the other end of the feeding pipe, which is positioned outside the drill hole, is connected with a grouting pump; the discharge pipe is positioned above the vent pipe, penetrates through the two elastic bags and is in sealed connection with the two elastic bags; a discharge hole positioned in the accommodating space is formed in the discharge pipe, and a plugging head is arranged at one end of the discharge pipe positioned in the drill hole; the supporting plate is used for sealing the orifice of the drilled hole and is fixedly connected with the mine wall; the supporting plate is provided with a mounting hole communicated with the drilling hole; a bulge part positioned in the drill hole is arranged on one side of the supporting plate, and the mounting hole penetrates through the supporting plate and the bulge part; the supporting plate is also provided with a through hole for the feeding pipe and the discharging pipe to pass through.

2. The two-piece two-injection-pipe direct-connection hole packer as claimed in claim 1, wherein a safety valve is provided on the first feed port, and a check valve is provided on both of the second feed ports.

3. The two-piece two-injection-pipe direct-connection hole packer as claimed in claim 1, wherein the discharge hole is provided with a plurality of discharge holes which are uniformly distributed on the discharge pipe; each all be equipped with vertical pipe on the discharge gate, vertical pipe is kept away from the one end of discharging pipe upwards extends, and is close to the top of drilling.

4. The two-piece two-injection-pipe direct-connection hole packer as claimed in claim 1, wherein the supporting plate is provided with a plurality of uniformly distributed connecting holes, and the supporting plate is fixed on the mine shaft wall through bolts penetrating through the connecting holes.

5. The two-piece two-injection-pipe direct-connection hole packer as claimed in claim 4, wherein the protrusion is integrally formed with the support plate, and the support plate is provided with a sealing groove around the protrusion and a sealing ring in the sealing groove; the sum of the thicknesses of the support plate and the raised portion is one tenth to one fifth of the length of the vent tube.

6. The two-piece two-shot through-tube direct-connected hole packer of claim 4, wherein the vent tube is slidably connected to the mounting hole; be equipped with external screw thread section and threaded connection on the breather pipe in nut on the external screw thread section is used for locking fixedly the breather pipe with the backup pad.

7. The two-piece two-injection-pipe direct-connection hole packer as claimed in claim 1, wherein a third valve is provided on a pipe section of the discharge pipe located outside the borehole.

8. The two-piece two-injection-pipe direct-connection hole packer as claimed in claim 1, wherein a pressure gauge is provided on a pipe section of the feed pipe located outside the drilled hole.

9. The two-piece two-injection-pipe direct-connection hole packer as claimed in claim 1, wherein the vent pipe comprises two connecting pipe sections, and the two connecting pipe sections are detachably connected; the two connecting pipe sections respectively penetrate through the two elastic bags.

10. The two-piece two-injection-pipe direct-connected hole packer as claimed in claim 1, wherein a slurry separation layer is provided on the outer side of the elastic bladder.