CN112983430A

CN112983430A - Stratum freezing device

Info

Publication number: CN112983430A
Application number: CN202110201457.9A
Authority: CN
Inventors: 张步俊; 江军; 张�浩; 姚直书; 程桦; 荣传新; 王思; 马跃峰; 张�林; 王朝霞; 孟方; 冯广奎
Original assignee: China Coal No 5 Construction Co Ltd
Current assignee: China Coal No 5 Construction Co Ltd
Priority date: 2021-02-23
Filing date: 2021-02-23
Publication date: 2021-06-18

Abstract

The invention discloses a stratum freezing device which comprises an outer pipe and an inner pipe, wherein a medium outlet is formed in the side wall of the outer pipe in a penetrating mode, a conical sealing pipe bottom is arranged at the lower end of the outer pipe, a medium inlet is formed in the upper end of the inner pipe, the outer pipe is a concentric reducing pipe, a sealing clamping piece is arranged in the inner cavity of the outer pipe and is arranged above the medium outlet to fix the outer wall of the inner pipe, a contact is vertically connected to the lower portion of the inner pipe, and a medium channel is formed. Through the arrangement of the outer pipe, the inner pipe and the sealing clamping piece, the aims of achieving stratum stage freezing and local freezing and strengthening local freezing are achieved at the same time.

Description

Stratum freezing device

Technical Field

The invention belongs to the technical field of freezing method shaft sinking, and particularly relates to a stratum freezing device.

Background

In recent years, the freezing shaft sinking construction technology is more and more widely applied, and particularly, the freezing shaft sinking construction technology can effectively play a role in safety and rapidness for the construction of coal mine shafts with thicker impact layers. The freezing method well sinking construction is that the water-containing soil body and rock body around the shaft are frozen by utilizing the artificial freezing technology to form a frozen wall resisting the hydraulic connection of ground pressure and water pressure cutting, thereby playing the role of temporary reinforcement and ensuring the safe construction of the shaft. The shaft often passes through a deep stratum, the cold energy is often wasted by adopting a one-time full-depth freezing method, and if a differential pipe freezing method is adopted, the lower frozen wall is sometimes slow to coil or difficult to coil; the water-rich bedrock section or the aquifer can be a weak part of a frozen wall, and other positions are often over frozen by simply taking local weak positions as control conditions, so that the shaft is difficult to excavate, cold energy is wasted, and the construction period is prolonged.

A bidirectional reinforced freezing device and a working method are described in Chinese patent with application number CN202010195246.4, and the technical scheme that steel sheets are welded on a freezing pipe to increase the heat exchange area and the bidirectional reinforced freezing device is inserted into a weak stratum or a weak position of a freezing wall to reinforce the freezing is provided for reinforcing the freezing effect, but the technical scheme has high construction difficulty and high construction cost; the invention discloses a freezer capable of realizing staged freezing and a staged freezing method, which are disclosed in the Chinese invention patent with the application number of CN202010134041.5, and the freezer comprises a liquid distribution ring, a liquid collection ring, a tee joint, a freezing pipe, an upper section freezing liquid supply pipe, a lower section freezing liquid return pipe and a lower section freezing liquid supply pipe, wherein the bottom ends of the upper section freezing liquid supply pipe, the lower section freezing liquid return pipe and the lower section freezing liquid supply pipe extend into the interior of the freezing pipe along the axis of the freezing pipe, and the upper ends of the upper section freezing liquid supply pipe, the lower section freezing liquid return pipe and the lower section freezing liquid supply pipe extend out of the top end of; the distance between the bottom end of the lower freezing liquid supply pipe and the bottom of the freezing pipe is smaller than the distance between the upper freezing liquid supply pipe and the bottom of the freezing pipe, and the distance between the lower freezing liquid return pipe and the bottom of the freezing pipe is smaller than the distance between the upper freezing liquid supply pipe and the bottom of the freezing pipe. For this purpose, a formation freezing device is designed.

Disclosure of Invention

The invention aims to provide a stratum freezing device to solve the problem that the staged freezing and the local freezing of a stratum and the strengthening of the local freezing cannot be simultaneously realized in the background technology.

In order to achieve the purpose, the specific technical scheme of the formation freezing device is as follows:

the utility model provides a stratum freezing device, includes outer tube and inner tube, and the outer tube lateral wall link up and is equipped with the medium export, and the outer tube lower extreme is equipped with the sealed socle of toper, and the inner tube upper end sets up to medium entry, the outer tube is concentric reducing pipe, and the outer tube inner chamber is provided with sealed fastener, and the fixed inner tube outer wall in medium export top is arranged in to sealed fastener, and the inner tube lower part is connected with the contact perpendicularly, is equipped with the medium passageway between inner tube and contact.

Further, sealed fastener includes sealed overcoat and sealed inserts, and sealed overcoat runs through and is equipped with the vertically siphunculus mouth, and the siphunculus internal diameter is greater than the inner tube external diameter, and sealed overcoat and the sealed laminating of outer tube wall of outer tube, the sealed centre gripping of sealed inserts inner tube outer wall and the sealed laminating of siphunculus mouth.

Further, the through pipe opening comprises an internal threaded pipe.

Furthermore, the internal thread pipe is a conical internal thread pipe with a thick upper part and a thin lower part.

Furthermore, the sealing insert comprises a thread clamping piece and a sealing plug which are matched with the internal thread pipe, the thread clamping piece penetrates through a through hole, and the sealing plug is in sealing fit with the through hole.

Furthermore, the through hole is a tapered hole with a thick upper part and a thin lower part.

Furthermore, a clamping device for limiting the displacement of the inner tube is arranged above the sealing insert.

Furthermore, the outer wall of the inner pipe is provided with a turbulence component.

Furthermore, the contact is a conical contact, the conical contact comprises an elastic sleeve, a positioning conical head is arranged in the middle of the elastic sleeve, and the conical angle of the positioning conical head is not larger than that of the conical sealing pipe bottom.

Furthermore, more than two rows of pressing grooves are formed in the side face of the elastic sleeve.

Compared with the prior art, the invention has the following beneficial effects:

1. the freezing device can realize the staged and segmented freezing mode by adopting the matching of the outer pipe and the inner pipe, has a simple structure, effectively shortens the working period, improves the working efficiency and reduces the working cost.

2. The outer pipe is set to be a concentric reducing pipe, so that the freezing medium can gradually rise from the bottom of the conical sealing pipe when entering the bottom of the conical sealing pipe of the outer pipe through the inner pipe and the medium channel, the concentric reducing pipe is thin to thick, the difference of freezing circle-crossing time is realized, and the staged freezing effect of the stratum is better controlled.

3. The arrangement of the internal thread pipe and the thread clamping piece enables the device to be more convenient to replace the freezing area, and the sectional type stratum freezing can be flexibly achieved.

4. The arrangement of the elastic sleeve and the positioning conical head ensures that the contact is basically kept on the axis of the inner cavity of the outer tube when moving in the inner cavity of the outer tube, so that the position of the contact does not influence the freezing ring-forming effect.

5. The arrangement of the pressure discharge groove can effectively reduce the resistance caused by pressure change when the elastic sleeve moves back and forth in the inner cavity of the outer tube.

Drawings

FIG. 1 is a schematic diagram of the freezing apparatus of the present invention;

FIG. 2 is a schematic view of a contact configuration according to the present invention;

FIG. 3 is a schematic view of the connection of the inner tube and the contact according to the present invention;

FIG. 4 is a schematic view of the internal connection structure of the present invention;

the reference numbers in the figures illustrate: 1. the sealing device comprises an outer pipe, 11 a medium outlet, 12 a conical sealing pipe bottom, 2 an inner pipe, 21 a medium inlet, 22 a turbulence component, 3 a sealing clamping piece, 31 a sealing outer sleeve, 311 a through pipe opening, 32 a sealing embedded piece, 321 a thread clamping piece, 3211 a through hole, 322 a sealing plug, 4 a contact, 41 an elastic sleeve, 411 a pressure discharge groove, 42 a positioning conical head, 5 a medium channel and 6 a clamping device.

The specific implementation mode is as follows:

for a better understanding of the objects, structure and function of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.

Referring to fig. 1-4, a stratum freezing device is designed, which comprises an outer pipe 1 and an inner pipe 2, wherein a medium outlet 11 for discharging freezing medium is arranged on the side wall of the outer pipe 1 in a penetrating way, and the freezing medium can be low-temperature saline water. The lower end of the outer pipe 1 is provided with a conical sealing pipe bottom 12, the bottom end of the conical sealing pipe 12 is welded with the outer pipe by adopting a material which is the same as or similar to the material of the outer pipe 1, and can be used on site after being qualified through pressure test, and the test pressure is 2 times of the sum of the pressure difference between the liquid salt water column in the outer pipe and the clear water column outside the outer pipe and the working pressure of the pump; in the freezing hole that the job site was predetermine can be put into more convenient at conical sealed socle, 2 upper ends of inner tube set up to medium entry 21, outer tube 1 is concentric reducing pipe, and 1 inner chamber of outer tube is provided with sealed fastener 3, and fixed inner tube 2 outer walls in medium export 11 top are arranged in to sealed

fastener

3, and 2 lower parts of inner tube are connected with contact 4 perpendicularly, can use materials such as billet to use even fixed connection of means such as welding with contact and inner tube, are equipped with medium passageway 5 between inner tube 2 and contact 4, supply the freezing medium to flow to outer tube 1 by inner tube 2.

Wherein, sealed fastener 3 is including sealed overcoat 31 and sealed inserts 32, and sealed overcoat 31 runs through and is equipped with vertically siphunculus mouth 311, and sealed overcoat can use rubber to make, and the logical mouth of pipe 311 internal diameter is greater than the 2 external diameters of inner tube, and sealed overcoat 31 and the sealed laminating of 1 inner wall of outer tube, sealed inserts 32 sealed centre gripping inner tube 2 outer wall and the sealed laminating of siphunculus mouth 311.

When the freezing device is used, the outer pipe 1 is placed in a stratum to be frozen, the inner pipe 2 is arranged at a designated position in the outer pipe 1 according to operation requirements, freezing media such as special low-temperature saline water enter the inner pipe 2 from the medium inlet 21, rise along the upper annular space of the conical sealing pipe bottom 12 of the outer pipe 1 and flow out from the medium outlet 11, and freezing of the stratum at the upper part of the conical bottom end of the outer pipe 1 is realized; and then, lifting the inner pipe 2, continuously lowering the outer pipe 1 and the inner pipe 2 to the next specified position, and repeating the steps to realize the segmented and staged freezing of the stratum.

In the above embodiment, 3 examples are listed to realize the above technical solution:

example 1

In this embodiment, the outer tube 1 is preferably a three-step concentric reducer, and the through-tube opening 311 includes an internally threaded tube, which is a tapered internally threaded tube with a thick upper part and a thin lower part. The sealing insert 32 comprises a thread clamping piece 321 and a sealing plug 322 which are matched with the internal thread pipe, the thread clamping piece 321 is made of solid metal materials, the sealing plug 322 is made of rubber materials, the thread clamping piece 321 penetrates through a through hole 3211, the sealing plug 322 is in sealing fit with the through hole 3211, and the through hole 3211 is a tapered hole with a thick upper part and a thin lower part.

Example 2

In this embodiment, on the basis of embodiment 1, it is further designed that a clamping device 6 for limiting the displacement of the inner tube 2 is arranged above the sealing insert 32, the clamping device 6 is preferably a hoop, and the hoop tightens the inner tube 2, so as to limit the up-and-down displacement of the inner tube 2; the outer wall of the inner tube 2 below the sealing clamping piece 3 is provided with the turbulence member 22, the turbulence member 22 is a wavy protruding part, and when a freezing medium flows through the turbulence member 22, a turbulence effect can be generated, so that the contact area between the freezing medium and the inner wall of the outer tube 1 is increased, and the freezing effect is enhanced.

Example 3

In this embodiment, on the basis of embodiment 2, it is further designed that the contact 4 is a tapered contact. The conical contact comprises an elastic sleeve 41, the elastic sleeve 41 is made of elastic materials, such as rubber materials, and then the elastic sleeve 41 has an elastic telescopic function, when the elastic sleeve 41 enters a small diameter from a thick diameter of the outer pipe 1, the outer layer of the elastic sleeve 41 is extruded by the inner wall of the concentric reducing pipe to shrink, the elastic sleeve 41 is always attached to the inner wall of the outer pipe 1, a positioning conical head 42 is arranged in the middle of the elastic sleeve 41 and can be made of hard materials such as steel, and the conical angle of the positioning conical head 42 is not larger than that of the conical sealing pipe bottom 12. The side of elastic sleeve 41 is equipped with 4 and arranges the indent 411, and then when making inner tube 2 transfer, liquid and the gas of contact 4 lower part enter into outer tube 1 through arranging indent 411, alleviate the resistance when transferring.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The utility model provides a stratum freezing device, includes outer tube (1) and inner tube (2), and outer tube (1) lateral wall link up and is equipped with medium export (11), and outer tube (1) lower extreme is equipped with sealed socle of toper (12), and inner tube (2) upper end sets up to medium entry (21), its characterized in that: the outer tube (1) is a concentric reducing tube, a sealing clamping piece (3) is arranged in the inner cavity of the outer tube (1), the outer wall of the inner tube (2) is fixed above the medium outlet (11) through the sealing clamping piece (3), the lower part of the inner tube (2) is vertically connected with a contact (4), and a medium channel (5) is arranged between the inner tube (2) and the contact (4).

2. The formation freezing device according to claim 1, wherein the sealing fastener (3) comprises a sealing outer sleeve (31) and a sealing insert (32), the sealing outer sleeve (31) is provided with a vertical through pipe orifice (311) in a penetrating mode, the inner diameter of the through pipe orifice (311) is larger than the outer diameter of the inner pipe (2), the sealing outer sleeve (31) is in sealing fit with the inner wall of the outer pipe (1), and the sealing insert (32) clamps the outer wall of the inner pipe (2) in sealing fit with the through pipe orifice (311).

3. A formation freezing apparatus according to claim 2, wherein the through-flow nozzle (311) comprises an internally threaded tube.

4. The formation freezing device of claim 3, wherein the internally threaded pipe is a tapered internally threaded pipe with a thick upper part and a thin lower part.

5. A formation freezing apparatus according to claim 3 or 4, wherein the sealing insert (32) comprises a thread fastener (321) matched with the internally threaded pipe and a sealing plug (322), the thread fastener (321) is provided with a through hole (3211) in a penetrating way, and the sealing plug (322) is in sealing fit with the through hole (3211).

6. A formation freezing apparatus according to claim 5, wherein the through hole (3211) is a tapered hole with a large upper part and a small lower part.

7. A formation freezing apparatus according to claim 2, wherein a clamping device (6) for limiting the displacement of the inner pipe (2) is arranged above the sealing insert (32).

8. A formation freezing apparatus according to claim 1, wherein the outer wall of the inner pipe (2) is provided with a flow disturbing member (22).

9. A stratum freezing apparatus according to claim 1, characterized in that the contact (4) is a conical contact, the conical contact comprises an elastic sleeve (41), a positioning conical head (42) is arranged in the middle of the elastic sleeve (41), and the cone angle of the positioning conical head (42) is not larger than that of the conical sealing pipe bottom (12).

10. A formation freezing apparatus according to claim 9, wherein the elastic sleeve (41) is provided with two or more rows of pressing grooves (411) on the side.