CN111577290B - Method for repairing vertical shaft wall by using frozen soil curtain - Google Patents
Method for repairing vertical shaft wall by using frozen soil curtain Download PDFInfo
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- CN111577290B CN111577290B CN202010453946.9A CN202010453946A CN111577290B CN 111577290 B CN111577290 B CN 111577290B CN 202010453946 A CN202010453946 A CN 202010453946A CN 111577290 B CN111577290 B CN 111577290B
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- pipe
- wall
- pressure relief
- relief groove
- frozen soil
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/10—Preparation of the ground
- E21D1/12—Preparation of the ground by freezing
- E21D1/14—Freezing apparatus
Abstract
The invention discloses a method for repairing a vertical shaft well wall by utilizing a frozen soil curtain, which is characterized in that a pressure relief groove position is preset, a freezing pipe is arranged near the pressure relief groove and is connected with an external refrigeration station, the refrigeration station provides refrigerant liquid for the freezing pipe to freeze a stratum in a certain range of the corresponding position of the pressure relief groove so as to form the frozen soil curtain, a reliable water sealing effect is realized, then the pressure relief groove is arranged under the protection of the frozen soil curtain, a compressible layer is arranged in the pressure relief groove, after the construction of the compressible layer is finished and the well wall has no water penetration risk, the frozen soil curtain can not play a water sealing role any more, and compared with the ground freezing, the engineering cost can be greatly reduced; compared with the existing commonly used wall post-grouting, the method can greatly improve the safety when repairing the well wall, can completely seal water, and eliminate the potential safety hazard that water sand flows into the shaft when the shaft wall is repaired by slotting treatment; the method has great value for guaranteeing the repair safety of the vertical shaft wall and reducing the repair cost in the future.
Description
Technical Field
The invention relates to the field of repairing a vertical shaft wall, in particular to a method for repairing a vertical shaft wall by using a frozen soil curtain.
Background
Since 1987, more than 110 vertical shaft shafts penetrating through deep surface soil layers are damaged in China, and the fracture is mainly caused by vertical additional force which is not considered in the design of the original shaft shafts due to the settlement of the stratum, and the additional force is continuously increased along with the settlement of the stratum until the shaft wall is crushed. Aiming at the well wall breakage disaster, one or more annular pressure relief grooves are generally arranged at a proper position in the longitudinal direction of the well wall, and then a compressible layer is filled in the pressure relief grooves to form an axial compressible well wall. The collapsible wall of the well during compression accommodates formation subsidence, limiting any increase in vertical parasitic forces acting on the wall of the well, thereby preventing the wall of the well from breaking. However, when the annular pressure relief groove is formed, the water sealing performance of the well wall is damaged, water sealing construction needs to be performed on the upper and lower positions of the groove in a certain range before grooving, otherwise, water and sand behind the well wall can possibly rush into the shaft to cause great safety accidents.
In order to form a water-sealing curtain before the pressure relief groove is opened, cement or chemical grout is injected into the formation around the well wall, generally by means of a back-grouting method, in order to form a curtain to prevent water from entering the well bore. However, in recent years, as the depth of a shaft is increased, the longitudinal position of the slot is increased, the corresponding underground water pressure is large, and the grouting difficulty is increased. When the water pressure is very high, the risk that water sand rushes into a shaft after the partition wall in the grouting period is greatly increased, and the grouting curtain can not completely seal water.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide a method for repairing a vertical shaft well wall by using a frozen soil curtain, which forms the frozen soil curtain through a stratum in a certain range at the corresponding position of a freezing pressure relief groove to realize a reliable water sealing effect, then the pressure relief groove is arranged under the protection of the frozen soil curtain, a compressible layer is arranged in the pressure relief groove, and the frozen soil curtain can not play a water sealing role any more after the construction of the compressible layer is finished and the well wall has no water permeability risk.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a method for repairing a vertical shaft wall by utilizing a frozen soil curtain, which specifically comprises the following steps:
s1, presetting a pressure relief groove position to be opened in a well wall, installing a freezing pipe in close contact with the inner wall of the well wall in a certain range from top to bottom of the pressure relief groove position, wrapping a heat insulation layer on the exposed part of the freezing pipe, and performing a freezing pipe pressurizing leakage detection test;
s2, respectively communicating a liquid supply pipe and a liquid outlet pipe at an inlet and an outlet of the freezing pipe, and wrapping heat-insulating layers on the outer walls of the liquid supply pipe and the liquid outlet pipe;
s3, respectively communicating a liquid supply pipe and a liquid outlet pipe with a liquid outlet and a liquid return port of the refrigerating station outside the well wall;
s4, starting the refrigeration station to send the refrigerant liquid into the freezing pipe through the liquid supply pipe, wherein the refrigerant liquid returns to the refrigeration station through the liquid outlet pipe after flowing through the freezing pipe to complete the circulation of the refrigerant liquid;
s5, keeping the refrigerant liquid to circularly flow until a frozen soil curtain with a certain thickness is formed in a soil layer near the freezing pipe installation section;
s6, removing the freezing pipe, excavating a pressure relief groove at a preset position, and backfilling a compressible layer in the pressure relief groove after the pressure relief groove is excavated;
and S7, removing the liquid supply pipe and the liquid outlet pipe to finish the well wall repairing project.
Preferably, in step S1, the upper and lower fixed ranges of the pressure relief groove position are within 5m of the upper and lower positions.
Preferably, in step S1, the freezing pipe is a spiral steel pipe or an S-shaped steel pipe wound up and down.
Preferably, in step S4, the refrigerant liquid is low-temperature brine with a temperature of 35 ℃ below zero to 10 ℃ below zero.
Preferably, in step S5, the frozen soil curtain is formed to have a radial thickness not less than 1m and a height not less than 5m, so as to ensure that the frozen soil curtain is effectively sealed with water.
Preferably, in step S6, the pressure relief groove is not in contact with the earth layer and a certain well wall structure is left.
Preferably, in step S6, the compressible layer has a waterproof function.
The invention has the beneficial effects that: the freezing pipe is arranged in the well wall for freezing, and the waterproof effect during well wall repairing can be achieved only by forming a frozen soil curtain in a certain range above and below the pressure relief groove; compared with ground freezing, the construction cost can be greatly reduced; compared with the existing commonly used wall post-grouting, the method can greatly improve the safety when repairing the well wall, can completely seal water, and eliminate the potential safety hazard that water sand flows into the shaft when the shaft wall is repaired by slotting treatment; the method has great value for guaranteeing the repair safety of the vertical shaft wall and reducing the repair cost in the future.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a shaft wall structure (a spiral shape of a freezing pipe) of a method for repairing a shaft wall of a vertical shaft by using a frozen soil curtain according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a shaft wall structure (an upper S-shaped freezing pipe and a lower S-shaped freezing pipe) of a method for repairing a shaft wall of a vertical shaft by using a frozen soil curtain according to an embodiment of the present invention.
Description of reference numerals:
1. a soil layer; 2. frozen soil curtains; 3. a pressure relief groove; 4. a liquid supply tube; 5. a well wall; 6. a freezing pipe; 7. a liquid outlet pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, a method for repairing a wall of a vertical shaft by using a frozen soil curtain specifically comprises the following steps:
s1, presetting a pressure relief groove 3 needing to be opened in a well wall 5, installing a freezing pipe 6 in a range of 5m above and below the pressure relief groove 3 and tightly attached to the inner wall of the well wall 5, wherein the freezing pipe 6 is a spiral steel pipe, wrapping a heat insulation layer on the exposed part of the freezing pipe 6, and performing a pressurizing leakage detection test on the freezing pipe 6;
s2, respectively communicating a liquid supply pipe 4 and a liquid outlet pipe 7 at an inlet and an outlet of a freezing pipe 6, and wrapping heat-insulating layers on the outer walls of the liquid supply pipe 4 and the liquid outlet pipe 7;
s3, a liquid supply pipe 4 and a liquid outlet pipe 7 are respectively communicated with a liquid outlet and a liquid return port of the refrigeration station outside the well wall 5;
s4, starting a refrigeration station to send refrigerant liquid into a freezing pipe 6 through a liquid supply pipe 4, enabling the refrigerant liquid to flow through the freezing pipe 6 and then return to the refrigeration station through a liquid outlet pipe 7 to complete circulation of the refrigerant liquid, wherein the refrigerant liquid is low-temperature saline water at the temperature of minus 35 ℃ to minus 10 ℃;
s5, keeping the refrigerant liquid to circularly flow until a frozen soil curtain 2 with the radial thickness not less than 1m and the height not less than 5m is formed in the soil layer 1 near the installation section of the freezing pipe 6, and ensuring that the frozen soil curtain 2 effectively seals water;
s6, removing the freezing pipe 6, excavating a pressure relief groove 3 at a preset position, wherein the pressure relief groove 3 is in non-contact with the soil layer 1, a certain well wall structure is reserved, when the well wall 5 is a double layer, the pressure relief groove 3 is opened by an inner layer well wall, and a compressible layer with a waterproof function is backfilled in the pressure relief groove 3 after the pressure relief groove 3 is excavated;
s7, the liquid supply pipe 4 and the liquid outlet pipe 7 are removed, and the well wall 5 repairing project is completed.
Example 2
Referring to fig. 2, in step S1, the freezing tube 6 may be replaced by an upper and lower coiled S-shaped steel tube, and the rest of the steps are the same as those of embodiment 1.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. A method for repairing a vertical shaft wall by using a frozen soil curtain is characterized by comprising the following steps:
s1, presetting a pressure relief groove (3) to be opened in a well wall (5), installing a freezing pipe (6) in a certain range of the upper part and the lower part of the pressure relief groove (3) and close to the inner wall of the well wall (5), wrapping a heat insulation layer on the exposed part of the freezing pipe (6), and performing a pressure leakage detection test on the freezing pipe (6);
s2, an inlet and an outlet of the freezing pipe (6) are respectively communicated with a liquid supply pipe (4) and a liquid outlet pipe (7), and the outer walls of the liquid supply pipe (4) and the liquid outlet pipe (7) are wrapped with heat insulation layers;
s3, a liquid supply pipe (4) and a liquid outlet pipe (7) are respectively communicated with a liquid outlet and a liquid return port of the refrigeration station outside the well wall (5);
s4, starting the refrigeration station to send the refrigerant liquid into the freezing pipe (6) through the liquid supply pipe (4), and returning the refrigerant liquid to the refrigeration station through the liquid outlet pipe (7) after flowing through the freezing pipe (6) to complete the circulation of the refrigerant liquid;
s5, keeping the refrigerant liquid to circularly flow until a frozen soil curtain (2) with a certain thickness is formed in the soil layer (1) near the installation section of the freezing pipe (6);
s6, removing the freezing pipe (6), excavating a pressure relief groove (3) at a preset position, and backfilling a compressible layer in the pressure relief groove (3) after the pressure relief groove (3) is excavated; the pressure relief groove (3) is in non-contact with the soil layer (1), a certain well wall structure is reserved, and the compressible layer has a waterproof function;
s7, the liquid supply pipe (4) and the liquid outlet pipe (7) are removed, and the well wall (5) repairing project is completed.
2. The method for repairing a wall of a vertical shaft using a frozen soil curtain as set forth in claim 1, wherein the upper and lower ranges of the position of the pressure-relief groove (3) in step S1 are within 5 m.
3. The method for repairing the wall of a vertical shaft well by using a frozen soil curtain as claimed in claim 1, wherein the freezing pipe (6) is a spiral steel pipe or an S-shaped steel pipe wound up and down in step S1.
4. The method as claimed in claim 1, wherein the refrigerant liquid is a low temperature salt water of-35 ℃ to-10 ℃ in step S4.
5. The method for repairing the wall of the vertical shaft well by using the frozen soil curtain as claimed in claim 1, wherein in the step S5, the frozen soil curtain (2) is formed to have a radial thickness of not less than 1m and a height of not less than 5m, so as to ensure that the frozen soil curtain (2) is effectively sealed with water.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010453946.9A CN111577290B (en) | 2020-05-26 | 2020-05-26 | Method for repairing vertical shaft wall by using frozen soil curtain |
| ZA2020/06633A ZA202006633B (en) | 2020-05-26 | 2020-10-26 | Method for repairing shaft lining using frozen soil curtain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010453946.9A CN111577290B (en) | 2020-05-26 | 2020-05-26 | Method for repairing vertical shaft wall by using frozen soil curtain |
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| Publication Number | Publication Date |
|---|---|
| CN111577290A CN111577290A (en) | 2020-08-25 |
| CN111577290B true CN111577290B (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010453946.9A Active CN111577290B (en) | 2020-05-26 | 2020-05-26 | Method for repairing vertical shaft wall by using frozen soil curtain |
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| CN (1) | CN111577290B (en) |
| ZA (1) | ZA202006633B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201835843U (en) * | 2010-10-28 | 2011-05-18 | 上海建工集团股份有限公司 | Water stopping device for tunneling machine going in and out of tunnel |
| CN103291325B (en) * | 2013-06-25 | 2015-08-19 | 山东科技大学 | The preventing control method of Coal-mining Above Confined-water floor strata gushing water |
| CN108627186A (en) * | 2018-03-22 | 2018-10-09 | 安徽理工大学 | To the method for fiber optic sensor system and deformation early warning that the borehole wall is monitored |
| CN109488305B (en) * | 2018-10-29 | 2020-10-13 | 安徽理工大学 | Freezer arrangement mode applied to damaged shaft repairing process |
| CN110397045A (en) * | 2019-08-01 | 2019-11-01 | 中国矿业大学 | It is a kind of with the forced channel steel sheet pile deep foundation pit supporting structure and method that freeze water shutoff function |
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2020
- 2020-05-26 CN CN202010453946.9A patent/CN111577290B/en active Active
- 2020-10-26 ZA ZA2020/06633A patent/ZA202006633B/en unknown
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| Publication number | Publication date |
|---|---|
| ZA202006633B (en) | 2021-09-29 |
| CN111577290A (en) | 2020-08-25 |
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