CN201206471Y

CN201206471Y - Sealing device for pumping borehole

Info

Publication number: CN201206471Y
Application number: CNU2008200368070U
Authority: CN
Inventors: 方良才; 朱贵旺; 周德昶; 尹建国; 何正勇
Original assignee: Huainan Mining Group Co Ltd
Current assignee: Huainan Mining Group Co Ltd
Priority date: 2008-05-23
Filing date: 2008-05-23
Publication date: 2009-03-11
Anticipated expiration: 2018-05-23

Abstract

A borehole sealing device for an exhausting and mining borehole is structurally characterized in that a borehole sealing sleeve is arranged and a sealing structure made of different materials is formed between the circumference of the borehole sealing sleeve and a rock wall along the axial direction. The borehole sealing device comprises a consolidated polyurethane tail sealing section positioned at the tail part of the borehole sealing sleeve, a consolidated polyurethane front sealing section positioned at the front section of the borehole sealing sleeve and a high pressure grouting cement mortar consolidated section positioned between the consolidated polyurethane tail sealing section and the consolidated polyurethane front sealing section. A high pressure grouting pipe and an exhaust pipe which are independent mutually are arranged; the high pressure grouting pipe and one end of the exhaust pipe are positioned outside a borehole; and the other end of the exhaust pipe penetrates the polyurethane front sealing section and is inserted in the position where the cement motor consolidated section is positioned. In the utility model, the three sections are sealed, so that the cement motor consolidated section positioned in the middle can bear a certain pressure during the grouting process, thereby improving the permeating degree of the cement motor toward the fracture of a rock and improving the blockage of the fracture of the rock, namely improving the sealing performance of the middle section.

Description

The extraction borehole hole sealing device

Technical field

The utility model relates to the mash gas pumping drilling hole sealing device that is applied under the coal mine, a kind of seal that is used to increase mash gas pumping drilling of more specifically saying so, thereby the hole sealing device of the extraction concentration of raising mash gas pumping drilling.

Background technology

At Anhui Province's Huainan Mining Area of high gas, existing research means shows that wanting to solve the gas problem can only be from the means of " taking out ".At present, the gas problem that solves mine main has two kinds of means, and the one, row, the 2nd takes out, and for firedamp drainage, the air quantity of each mine all is certain.So-called gas drainage under suction is exactly the negative pressure of utilizing plant equipment and pipe special to cause, and the gas that exists in the coal seam or discharge is released, and is transported to the way of ground or other safety places.In order to reduce or eliminate the restriction that gas is produced mine, have only by the gas of taking out in advance the coal seam in advance solve mine and tunneling process in gas emission, yet when taking out coal-bed gas in advance in advance by boring, exist a serious problem restricting the effect of gas drainage under suction, it is not tight that is exactly the sealing of hole of holing, cause air outside to be pumped in the boring, had a strong impact on the concentration of extraction and the negative pressure of extraction.

The sealing of hole mode of existing simple use polyurethane can not satisfy the sealing of hole requirement well at present.

The utility model content

The utility model is for fear of above-mentioned existing in prior technology weak point, and a kind of good airtight performance extraction borehole hole sealing device that has is provided, to improve the extraction concentration of mash gas pumping drilling.

The technical scheme that the utility model technical solution problem is adopted is:

The design feature of the utility model extraction borehole hole sealing device is that the sealing of hole sleeve pipe is set, form the enclosed construction of different materials between the periphery of sealing of hole sleeve pipe and the crag vertically, comprise the fixed polyurethane tail envelope section that is positioned at sealing of hole sleeve pipe afterbody, be positioned at the preceding envelope section of fixed polyurethane of sealing of hole sleeve pipe leading portion, and before polyurethane tail envelope section and polyurethane the section of envelope admittedly of the high-pressure slip-casting cement mortar between the envelope section, separate high-pressure slip-casting pipe and stack are set, high-pressure slip-casting pipe and stack one end are positioned at beyond the aperture, the other end runs through envelope section before the polyurethane, and is inserted in cement mortar admittedly on the position at the section of envelope place.

Design feature of the present utility model also is:

In the envelope section, two ends are respectively forming panel with the annular baffle before polyurethane tail envelope section and the polyurethane.

On the outside mouth of pipe of high-pressure slip-casting pipe and stack, high pressure sluice valve is set respectively.

Compare with existing technology, the effect that the utility model is useful is embodied in:

1, the utility model seals section and cement mortar three sections sealings of the section of envelope formation admittedly before sealing section, polyurethane with the polyurethane tail, make interjacent cement mortar admittedly the section of envelope in the slip casting process, can bear certain pressure, thereby improve the penetration degree of cement mortar in rock fracture, raising also promptly improves the sealing performance of interlude for the shutoff in the crack of rock.

2, the utility model installs baffle plate additional by the two ends of envelope section before polyurethane tail envelope section and polyurethane, can make well to expand in fixing space in the urethane cures forming process, thereby obtain good seal on this section.

3, the utlity model has practicality widely, be applicable to all kinds of borings, comprise, more can embody its beneficial effect in the middle use of the relatively advanced boring in coal petrography crack along layer a boring, layer-through drilling etc.

Description of drawings:

Fig. 1 is the utility model structural representation.

Fig. 2 is a polyurethane tail envelope segment structure schematic diagram in the utility model.

Fig. 3 is a tail block plated construction schematic diagram in the utility model.

Fig. 4 seals the segment structure schematic diagram before the polyurethane in the utility model.

Fig. 5 is a preceding block plated construction schematic diagram in the utility model.

Number in the figure: seal section, 43 the cement mortar section of envelope, 5 tail block plates admittedly before block plate, 2 high-pressure slip-casting pipes, 3 stacks, 4 sealing of hole sleeve pipes, 41 polyurethane tails envelope section, 42 polyurethane before 1.

Below by the specific embodiment, the utility model is described in further detail in conjunction with the accompanying drawings:

The specific embodiment:

Referring to Fig. 1, sealing of hole sleeve pipe 4 is set, form the enclosed construction of different materials between the periphery of sealing of hole sleeve pipe 4 and the crag vertically, comprise the fixed polyurethane tail envelope section 41 that is positioned at sealing of hole sleeve pipe 4 afterbodys, be positioned at the preceding envelope section 42 of fixed polyurethane of sealing of hole sleeve pipe leading portion, and the section of envelope 43 admittedly of the high-pressure slip-casting cement mortar between tail envelope section 41 and preceding envelope section 42, independently high-pressure slip-casting pipe 2 and stack 3 are set separately, high-pressure slip-casting pipe 2 and stack 3 one ends are positioned at beyond the aperture, the other end runs through envelope section 42 before the polyurethane, and is inserted in cement mortar admittedly on the position at the section of envelope 43 places.

In concrete the enforcement, in order to guarantee the sealing performance of envelope before polyurethane tail envelope section and the polyurethane section, and help the moulding of polyurethane material, the two ends of envelope section are respectively forming panel with the annular baffle before polyurethane tail envelope section and polyurethane, as Fig. 2, shown in Figure 3, the two ends that are positioned at polyurethane tail envelope section are respectively tail block plates 5; Fig. 4, shown in Figure 5, what be positioned at the preceding envelope section of polyurethane two ends is respectively preceding block plate 1; Tail block plate 5 and preceding block plate 1 all adopt sheet iron plate, admittedly be welded in the periphery of sealing of hole sleeve pipe 4; On the outside mouth of pipe of high-pressure slip-casting pipe 2 and stack 3, high pressure sluice valve is set respectively.

In concrete the enforcement, can comprise: the length that the preceding envelope section of polyurethane tail envelope section and polyurethane is set is respectively 500mm, and the cement mortar section of envelope 43 admittedly is 8mm, and the caliber of sealing of hole sleeve pipe 4 is 50mm, and the diameter of tail block plate 5 and preceding block plate 1 is 105mm,

In the sealing of hole process, envelope section 42 before polyurethane tail envelope section 41 of at first form solidifying and the polyurethane subsequently, adopts high-pressure pump to inject cement pastes by high-pressure slip-casting pipe 2, forms the cement mortar section of envelope 43 admittedly through maintenance.In the slip casting process, exhaust pipe mouth has the gate valve of closing when returning slurry on the exhaust pipe mouth, and row band pressure injection is starched again, requires to reach the grouting pressure of 4Mpa, makes slurries infiltrate the coal petrography wall, can effectively improve the leakproofness of sealing of hole with this; The proportioning of cement mortar is by weight water: cement is 1:2.

Claims

1, the extraction borehole hole sealing device, it is characterized in that being provided with sealing of hole sleeve pipe (4), form the enclosed construction of different materials between the periphery of sealing of hole sleeve pipe (4) and the crag vertically, comprise the fixed polyurethane tail envelope section (41) that is positioned at sealing of hole sleeve pipe (4) afterbody, be positioned at the preceding envelope section of fixed polyurethane (42) of sealing of hole sleeve pipe leading portion, and be positioned at before polyurethane tail envelope section (41) and the polyurethane section of envelope (43) admittedly of the high-pressure slip-casting cement mortar between the envelope section (42), separate high-pressure slip-casting pipe (2) and stack (3) are set, described high-pressure slip-casting pipe (2) and stack (3) one ends are positioned at beyond the aperture, the other end runs through envelope section (41) before the polyurethane, and is inserted in cement mortar admittedly on the position at the section of envelope (43) place.

2, extraction borehole hole sealing device according to claim 1 is characterized in that sealing in the section (42) before described polyurethane tail envelope section (41) and the polyurethane, and two ends are respectively forming panel with the annular baffle.

3, extraction borehole hole sealing device according to claim 1 is characterized in that on the outside mouth of pipe of described high-pressure slip-casting pipe (2) and stack (3) high pressure sluice valve being set respectively.