CN102278116B - Making underground freezing wall device and method for making freezing wall in winter cold region - Google Patents

Abstract

The invention relates to a device and method for manufacturing an underground frozen wall in cold areas in winter. The device is formed in such ways that: an outlet of a U-shaped pipe is connected with a water return radiator through an outlet sensor and a flowmeter, the water return radiator is connected with a water tank through a pipeline and a water tank inlet switch valve, the lateral face of the upper part of the water tank is provided with a water injection port, the water return radiator is connected with a water pump through a switch valve, a water tank water outlet pipeline and a filtering valve, the water tank is connected with the water tank water outlet pipeline through a water tank outlet switch valve, and the water pump is connected with an inlet of the U-shaped pipe through a water injection radiator, an air valve and an inlet sensor. Cold is obtained from the natural temperature outdoors in winter, the cold is conveyed into an underground frozen geologic body by taking a low-temperature glycol water solution as a circulating medium to further form a frozen wall instead of a liquid ammonia frozen geologic body; proved by tests, the temperature difference between the inlet and the outlet can reach 6 DEG C under the conditions that the outdoor temperature is -25 DEG C, and the flow rate is 18L/min; and the energy resources are saved, the engineering cost is reduced, and the benefits are increased.

Description

Making underground freezing wall device and method for making freezing wall in winter cold area

Technical field:

The invention relates to an underground cold storage device and a cold storage method, in particular to a device and a method for sending winter cold underground to freeze local geological bodies in cold winter regions.

Background technique:

In recent years, more and more projects require the manufacture of underground frozen walls, and frozen supports are usually used in civil engineering and mining engineering. In the excavation construction of tunnels, shafts or inclined shafts, it can play two roles of temporary support and waterproofing. Freezing support is suitable for underground projects with deep excavation and complex construction. The basic principle of freezing support is to freeze the formation around the cave wall and make the interstitial water freeze. The strength of the cave wall is increased by freezing and becomes an impermeable layer. The increase in the strength of the cave wall depends on the freezing temperature. In the first phase of Shanxi Water Conservancy's paper "Frozen Support Technology for Underground Engineering", a circular deep foundation pit with a depth of 40m and a diameter of 40m was excavated in 1960 on Kaiwei Island in the UK. The excavation area is full of Thames River. Gravel, silt and clay, and construction was completed using only frozen support and no other support. During the repair of a large-diameter tunnel boring machine in Carlow, UK, the surrounding sand and gravel were frozen by using frozen support technology. Although it was subjected to a high water head of 25m, the repair work was still unaffected. Shanxi Architecture Volume 36 No. 27 paper "Application of Freezing Method in Water Supply Project of Shenmu County", based on the basic situation of Shenmu County Water Supply Project, proposed a water blocking scheme using freezing method to solve the construction problem of vertical shaft passing through deep quicksand section. Power Grid and Clean Energy, Volume 24, Issue 4, "Research on the Construction Method of the Water Conveyance Tunnel Construction Shaft after Freezing", the freezing method shaft construction is an attempt to construct the shaft construction of the hydraulic tunnel, and the freezing method is used in the Shenmu County Water Supply Project Water Conveyance Tunnel The successful application in the project will provide reference and help for the future use of freezing method to solve complex geological construction problems and shaft construction in frozen state. In order to realize the underground in-situ mining of oil shale, it is necessary to make a frozen wall. In the paper "Research Progress of Oil Shale Electric Heating In-Situ Exploitation Technology" published in Volume 4, Issue 1 of Natural Gas Technology Magazine in 2010, the current method for making frozen walls is: After conventional drilling and completion, each well is connected to the ground conduit Form a closed circuit, and install a high-density polyethylene pipe with a small diameter in the casing of each well, inject the ammonia solution at -43°C into the well through the polyethylene pipe, return the ground from the outside of the polyethylene pipe, and return the refrigerant on the ground Enter another well and cycle again. With the continuous circulation of the freezing liquid, the frozen area continues to expand. Finally, the freezing ranges of every two connected freezing wells are docked to form a freezing wall. This method is used by the Anglo-Dutch joint venture Shell Company. The -43°C ammonia solution required by this method needs to be obtained by artificial refrigeration, so it needs to consume a lot of energy, resulting in high cost of freezing walls.

Invention content:

Purpose of the present invention is exactly at the deficiency of above-mentioned prior art, provides a kind of winter cold area to make underground freezing wall device;

Another object of the present invention is to provide a method for making an underground freezing wall in cold winter regions.

The purpose of the present invention is achieved through the following technical solutions:

The underground freezing wall device is made in the winter cold area, and the outlet of the U-shaped pipe 1 is connected to the return water radiator 4 through the outlet sensor 2 and the flow meter 3, and the return water radiator 4 is connected to the water tank 8 through the pipeline and the water tank inlet switch valve 5. The upper side of the water tank 8 is provided with a water injection port 9, the return water radiator 4 is connected to the water pump 13 through the switch valve 6, the water tank outlet pipeline and the filter valve 11, the water tank 8 is connected to the water tank outlet pipeline through the water tank outlet switch valve 7, and the water pump 13 passes through The pipeline is formed by connecting the inlet of the U-shaped pipe 1 through the water injection radiator 10, the air valve 12 and the inlet sensor 14.

The outlet sensor 2 and the inlet sensor 14 are respectively connected to the paperless recorder, the ranges of the outlet sensor 2 and the inlet sensor 14 are both -50°C+50°C, and the maximum range of the flow meter 3 is 30L/min.

The method for making an underground freezing wall in cold winter regions is characterized in that it includes the following sequence and steps:

a. Delineate the mining range of oil shale according to geological data, and drill more than one cooling injection well at the inner edge of the oil shale mining range. Drilling to the floor of the exploited oil shale;

b. Lower the U-shaped pipe 1 into the cold injection well and simply fill it up;

c. Connect the outlet of the U-shaped pipe 1 to the return water radiator 4 through the outlet sensor 2 and the flow meter 3. The return water radiator 4 is connected to the water tank 8 through the pipeline and the water tank inlet switch valve 5. The return water radiator 4 passes through the switch valve. 6. The outlet pipeline of the water tank and the filter valve 11 are connected to the water pump 13, the water tank 8 is connected to the outlet pipeline of the water tank through the outlet switch valve 7 of the water tank, the water pump 13 is connected to the U-shaped pipe 1 through the pipeline through the water injection radiator 10, the air valve 12 and the inlet sensor 14 The inlet connection of outlet sensor 2 and inlet sensor 14 are respectively connected with paperless recorder;

d. Ethylene glycol is prepared into a 55% aqueous solution;

e. Open the water tank inlet on-off valve 5, on-off valve 6, water tank outlet on-off valve 7 and air valve 12, inject the configured ethylene glycol aqueous solution into the water tank 8 through the water injection port 9, and fill the pipeline and water tank 8 with the ethylene glycol aqueous solution Close the air valve 12 and the water tank inlet switch valve 5 in the back;

f. Turn on the water pump 13, and the ethylene glycol aqueous solution enters the U-shaped pipe 1 through the water injection heat dissipation 10 and the inlet sensor 14, and the heat at the bottom of the well is taken out;

g. Then through the outlet sensor 2 and the flow meter 3, it enters the return water radiator 4 to dissipate heat, and then enters the water pump 13, and so on.

Beneficial effects: obtain cold from the outdoor natural temperature in winter, use low-temperature ethylene glycol aqueous solution as a circulating medium to send the cold into the underground frozen geological body, and then form a frozen wall, replacing liquid ammonia to freeze the underground geological body. After testing, the outdoor temperature Under the conditions of -25°C and a flow rate of 18L/min, the temperature difference between the inlet and outlet can reach 6°C. Energy is saved, engineering costs are reduced, and benefits are improved.

Description of drawings:

Attached is a structural diagram of the underground freezing wall device in cold winter regions

1 U-shaped pipe, 2 outlet sensor, 3 flow meter, 4 return water radiator, 5 water tank inlet on-off valve, 6 on-off valve, 7 water tank outlet on-off valve, 8 water tank, 9 water injection port, 10 water injection radiator, 11 filter valve, 12 air valves, 13 water pumps, 14 inlet sensors.

Detailed ways:

Below in conjunction with accompanying drawing and embodiment do further detailed description:

The underground freezing wall device is made in the winter cold area, and the outlet of the U-shaped pipe 1 is connected to the return water radiator 4 through the outlet sensor 2 and the flow meter 3, and the return water radiator 4 is connected to the water tank 8 through the pipeline and the water tank inlet switch valve 5. The upper side of the water tank 8 is provided with a water injection port 9, the return water radiator 4 is connected to the water pump 13 through the switch valve 6, the water tank outlet pipeline and the filter valve 11, the water tank 8 is connected to the water tank outlet pipeline through the water tank outlet switch valve 7, and the water pump 13 passes through The pipeline is formed by connecting the inlet of the U-shaped pipe 1 through the water injection radiator 10, the air valve 12 and the inlet sensor 14.

The outlet sensor 2 and the inlet sensor 14 are respectively connected to the paperless recorder, the ranges of the outlet sensor 2 and the inlet sensor 14 are both -50°C+50°C, and the maximum range of the flow meter 3 is 30L/min.

The method for making an underground freezing wall in cold winter regions is characterized in that it includes the following sequence and steps:

a. Delineate the mining range of oil shale according to geological data, and drill more than one cooling injection well at the inner edge of the oil shale mining range. Drilling to the floor of the exploited oil shale;

b. Put the U-shaped pipe 1 into the cold injection well. The U-shaped pipe 1 usually has an inner diameter of 25-40 mm and an outer diameter of 32-45 mm. Add a benzene plate in the middle of the U-shaped pipe 1 and simply bury it;

c. Connect the outlet of the U-shaped pipe 1 to the return water radiator 4 through the outlet sensor 2 and the flow meter 3. The return water radiator 4 is connected to the water tank 8 through the pipeline and the water tank inlet switch valve 5. The return water radiator 4 passes through the switch valve. 6. The outlet pipeline of the water tank and the filter valve 11 are connected to the water pump 13, the water tank 8 is connected to the outlet pipeline of the water tank through the outlet switch valve 7 of the water tank, the water pump 13 is connected to the U-shaped pipe 1 through the pipeline through the water injection radiator 10, the air valve 12 and the inlet sensor 14 The inlet connection of outlet sensor 2 and inlet sensor 14 are respectively connected with paperless recorder;

d. Ethylene glycol is prepared into a 55% aqueous solution;

e. Open the water tank inlet on-off valve 5, on-off valve 6, water tank outlet on-off valve 7 and air valve 12, inject the configured ethylene glycol aqueous solution into the water tank 8 through the water injection port 9, and fill the pipeline and water tank 8 with the ethylene glycol aqueous solution Close the air valve 12 and the water tank inlet switch valve 5 in the back;

f. Turn on the water pump 13, and the ethylene glycol aqueous solution enters the U-shaped pipe 1 through the water injection heat dissipation 10 and the inlet sensor 14, and the heat at the bottom of the well is taken out;

g. Then through the outlet sensor 2 and the flow meter 3, it enters the return water radiator 4 to dissipate heat, and then enters the water pump 13, and so on.

Example 1

The underground freezing wall device is made in the winter cold area, and the outlet of the U-shaped pipe 1 is connected to the return water radiator 4 through the outlet sensor 2 and the flow meter 3, and the return water radiator 4 is connected to the water tank 8 through the pipeline and the water tank inlet switch valve 5. The upper side of the water tank 8 is provided with a water injection port 9, the return water radiator 4 is connected to the water pump 13 through the switch valve 6, the water tank outlet pipeline and the filter valve 11, the water tank 8 is connected to the water tank outlet pipeline through the water tank outlet switch valve 7, and the water pump 13 passes through The pipeline is formed by connecting the inlet of the U-shaped pipe 1 through the water injection radiator 10, the air valve 12 and the inlet sensor 14.

The outlet sensor 2 and the inlet sensor 14 are respectively connected to the paperless recorder, the ranges of the outlet sensor 2 and the inlet sensor 14 are both -50°C+50°C, and the maximum range of the flow meter 3 is 30L/min.

The method for making an underground freezing wall in cold winter regions is characterized in that it includes the following sequence and steps:

a. Delineate the mining area of oil shale according to geological data, and drill more than one cooling injection well at the inner edge of the oil shale mining area. The distance between the wells is 2.5m, the diameter of the well is 160mm, and the depth of the well is drilled according to the geological data until it is mined. Oil shale floor;

b. Lower the U-shaped pipe 1 into the cold injection well. The U-shaped pipe has an inner diameter of 25mm, and a benzene plate is placed in the middle of the U-shaped pipe 1, and it is simply buried;

c. Connect the outlet of the U-shaped pipe 1 to the return water radiator 4 through the outlet sensor 2 and the flow meter 3. The return water radiator 4 is connected to the water tank 8 through the pipeline and the water tank inlet switch valve 5. The return water radiator 4 passes through the switch valve. 6. The outlet pipeline of the water tank and the filter valve 11 are connected to the water pump 13, the water tank 8 is connected to the outlet pipeline of the water tank through the outlet switch valve 7 of the water tank, the water pump 13 is connected to the U-shaped pipe 1 through the pipeline through the water injection radiator 10, the air valve 12 and the inlet sensor 14 The inlet connection of outlet sensor 2 and inlet sensor 14 are respectively connected with paperless recorder;

d. Ethylene glycol is prepared into a 55% aqueous solution;

e. Open the water tank inlet on-off valve 5, on-off valve 6, water tank outlet on-off valve 7 and air valve 12, inject the configured ethylene glycol aqueous solution into the water tank 8 through the water injection port 9, and fill the pipeline and water tank 8 with the ethylene glycol aqueous solution Close the air valve 12 and the water tank inlet switch valve 5 in the back;

f. Turn on the water pump 13, and the ethylene glycol aqueous solution enters the U-shaped pipe 1 through the water injection heat dissipation 10 and the inlet sensor 14, and the heat at the bottom of the well is taken out;

g. Then through the outlet sensor 2 and the flow meter 3, it enters the return water radiator 4 to dissipate heat, and then enters the water pump 13, and so on.

Example 2

The underground freezing wall device is made in the winter cold area, and the outlet of the U-shaped pipe 1 is connected to the return water radiator 4 through the outlet sensor 2 and the flow meter 3, and the return water radiator 4 is connected to the water tank 8 through the pipeline and the water tank inlet switch valve 5. The upper side of the water tank 8 is provided with a water injection port 9, the return water radiator 4 is connected to the water pump 13 through the switch valve 6, the water tank outlet pipeline and the filter valve 11, the water tank 8 is connected to the water tank outlet pipeline through the water tank outlet switch valve 7, and the water pump 13 passes through The pipeline is formed by connecting the inlet of the U-shaped pipe 1 through the water injection radiator 10, the air valve 12 and the inlet sensor 14.

The outlet sensor 2 and the inlet sensor 14 are respectively connected to the paperless recorder, the ranges of the outlet sensor 2 and the inlet sensor 14 are both -50°C+50°C, and the maximum range of the flow meter 3 is 30L/min.

The method for making an underground freezing wall in cold winter regions is characterized in that it includes the following sequence and steps:

a. Delineate the mining range of oil shale according to geological data, and drill more than one cooling injection well at the inner edge of the oil shale mining range. The distance between the wells is 3.5m, the diameter of the well is 300mm, and the depth of the well is drilled according to the geological data until it is mined. Oil shale floor;

b. Put the U-shaped pipe 1 into the cold injection well. The U-shaped pipe 1 adopts a diameter of 40 mm, and a benzene plate is placed in the middle of the U-shaped pipe 1, and it is simply buried;

c. Connect the outlet of the U-shaped pipe 1 to the return water radiator 4 through the outlet sensor 2 and the flow meter 3. The return water radiator 4 is connected to the water tank 8 through the pipeline and the water tank inlet switch valve 5. The return water radiator 4 passes through the switch valve. 6. The outlet pipeline of the water tank and the filter valve 11 are connected to the water pump 13, the water tank 8 is connected to the outlet pipeline of the water tank through the outlet switch valve 7 of the water tank, the water pump 13 is connected to the U-shaped pipe 1 through the pipeline through the water injection radiator 10, the air valve 12 and the inlet sensor 14 The inlet connection of outlet sensor 2 and inlet sensor 14 are respectively connected with paperless recorder;

d. Ethylene glycol is prepared into a 55% aqueous solution;

e. Open the water tank inlet on-off valve 5, on-off valve 6, water tank outlet on-off valve 7 and air valve 12, inject the configured ethylene glycol aqueous solution into the water tank 8 through the water injection port 9, and fill the pipeline and water tank 8 with the ethylene glycol aqueous solution Close the air valve 12 and the water tank inlet switch valve 5 in the back;

f. Turn on the water pump 13, and the ethylene glycol aqueous solution enters the U-shaped pipe 1 through the water injection heat dissipation 10 and the inlet sensor 14, and the heat at the bottom of the well is taken out;

g. Then through the outlet sensor 2 and the flow meter 3, it enters the return water radiator 4 to dissipate heat, and then enters the water pump 13, and so on.

Claims (3)

1. a cold area in winter makes underground freeze wall device, it is characterized in that, is connected backwater radiator (4) through outlet sensor (2), flow meter (3) by the outlet of U-shaped pipe (1), backwater The radiator (4) is connected to the water tank (8) through the pipeline and the water tank inlet switching valve (5). The upper side of the water tank (8) is provided with a water injection port (9), and the return water radiator (4) is passed through another switching valve ( 6), the water tank outlet pipeline and filter valve (11) are connected to the water pump (13), the water tank (8) is connected to the water tank outlet pipeline through the water tank outlet switch valve (7), and the water pump (13) passes through the pipeline through the water injection radiator (10) , an air valve (12) and an inlet sensor (14) are connected with the inlet of the U-shaped pipe (1). 2. make underground freezing wall device according to the winter cold area described in claim 1, it is characterized in that, outlet sensor (2) and inlet sensor (14) connect paperless recorder respectively, outlet sensor (2) and inlet sensor (14) ) ranges from -50°C to +50°C, and the maximum range of the flowmeter (3) is 30L/min. 3. according to the method for making underground freezing wall device making underground freezing wall in winter cold region according to claim 1, it is characterized in that, comprising the following steps: a. Delineate the mining range of oil shale according to geological data, and drill more than one cooling injection well at the inner edge of the oil shale mining range. The distance between wells is 2.5-3.5m, the diameter of the well is 130-300mm, and the depth of the well is based on geological data Drilling to the floor of the exploited oil shale; b. Lower the U-shaped pipe (1) into the cooling well; c. Connect the outlet of the U-shaped pipe (1) to the return water radiator (4) through the outlet sensor (2) and the flow meter (3). The water tank (8) is connected, the return water radiator (4) is connected with the water pump (13) through another switch valve (6), the water tank outlet pipeline and the filter valve (11), and the water tank (8) is connected with the water tank outlet switch valve (7) Connect with the water outlet pipeline of the water tank, the water pump (13) is connected to the inlet of the U-shaped pipe (1) through the pipeline through the water injection radiator (10), the air valve (12) and the inlet sensor (14), the outlet sensor (2) and the inlet sensor (14) respectively connected with the paperless recorder; d. Ethylene glycol is prepared into a 55% aqueous solution; e. Open the water tank inlet on-off valve (5), another on-off valve (6), the water tank outlet on-off valve (7) and the air valve (12), and inject the configured ethylene glycol aqueous solution into the water tank through the water injection port (9) ( 8), after the ethylene glycol aqueous solution fills the pipeline and the water tank (8), close the air valve (12) and the water tank inlet switch valve (5); f, turn on the water pump (13), the ethylene glycol aqueous solution enters the U-shaped pipe (1) through the water injection radiator (10) and the inlet sensor (14), and the heat at the bottom of the well is taken out; g. Then, through the outlet sensor (2) and the flow meter (3), it enters the return water radiator (4) for heat dissipation and then enters the water pump (13), and so on.

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