CN112922002A - Local difference freezing pipe capable of controlling freezing section applied to freezing construction - Google Patents
Local difference freezing pipe capable of controlling freezing section applied to freezing construction Download PDFInfo
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- CN112922002A CN112922002A CN202110397857.1A CN202110397857A CN112922002A CN 112922002 A CN112922002 A CN 112922002A CN 202110397857 A CN202110397857 A CN 202110397857A CN 112922002 A CN112922002 A CN 112922002A
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- freezing
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/14—Restraining of underground water by damming or interrupting the passage of underground water by freezing the soil
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to the technical field of artificial stratum freezing method construction of underground engineering, in particular to a local difference freezing pipe which is applied to freezing construction and can control a freezing section. The freezing pipe includes: the freezing section is controlled to the upper portion, the freezing section is controlled to the lower part, cut off device, feed liquor pipe, liquid return pipe and control valve. The control of different valves and the control of the flow path of the low-temperature refrigerant in the freezing pipe are adopted. The invention can realize selective freezing, avoid the defect that the traditional freezing pipe can only be frozen in a whole section, realize the control freezing of stratums with different layer depths, improve the freezing efficiency of the freezing pipe, control the freezing area and the freezing section, meet various construction requirements and the actual working condition requirements of engineering, and improve the working efficiency. The method has the outstanding characteristics of simple operation, strong construction practicability, excellent economy and the like, and has great popularization and application values.
Description
Technical Field
The invention relates to the technical field of artificial stratum freezing method construction of underground engineering, in particular to a local difference freezing pipe which is applied to freezing construction and can control a freezing section.
Background
The freezing method is to freeze water in stratum by means of artificial refrigeration technology to change loose water-bearing rock soil into frozen soil, raise its strength and stability and isolate underground water for underground engineering digging and building under the protection of frozen wall. The method is a physical reinforcing method of a soil layer, is a temporary reinforcing technology, and can be used for melting frozen soil with rock-like strength when engineering needs, and adopting a forced thawing technology when the reinforcing strength is not needed. According to the construction method, a freezing pipe is drilled in the water-bearing soil layer, circulating liquid nitrogen is introduced, the surrounding stratum is frozen, a hard frozen soil shell is formed, the stratum can be guaranteed to be stable, a water isolating effect can be achieved, and soil excavation of a deep foundation pit can be carried out. At present, more underground projects need to directionally control a freezing area according to construction requirements, and a freezing section is regulated and controlled according to construction progress and safety requirements.
The existing freezing pipes are round freezing pipes with single shape and function, a liquid supply pipe is arranged in each freezing pipe, refrigerant is introduced through the liquid supply pipe, and heat exchange is carried out between the outer wall of each freezing pipe and a soil body, so that a frozen soil curtain is formed on the soil layer around each freezing pipe. The method can only carry out full-section freezing, can not control the freezing section, and is not suitable for special engineering construction conditions.
Even if the outer wall of the freezing pipe is wrapped by a heat-insulating material or the inner layer of the freezing pipe is vacuumized, a large amount of cold energy is wasted, the quality and the use amount of circulating cold medium and the energy consumption of construction machinery are greatly increased, and the problem of segmented layered freezing cannot be solved.
The method can not solve the problem of layered difference freezing, and the non-freezing part of the freezing pipe is redesigned for each project, thereby causing great waste of materials in the later period. Meanwhile, the construction progress of the project is influenced, and the construction precision is difficult to guarantee.
Disclosure of Invention
The invention aims to overcome the problems in the background technology, provides a local difference freezing pipe which is applied to freezing construction and can control a freezing section, can realize selective freezing, avoids the defect that the traditional freezing pipe can only be frozen in a full section, improves the freezing efficiency of the freezing pipe, can control a freezing area and the freezing section, meets various construction requirements and actual engineering requirements, reduces the construction time on site, and can completely recycle materials after construction without influencing secondary utilization.
The invention is realized by the following steps:
the invention provides a local difference freezing pipe which comprises an upper control freezing section and a lower control freezing section, wherein the two freezing sections are connected through welding at a reserved position. The purpose of the design is that the traditional round freezing pipe is replaced by the double-section freezing pipe, the geometric parameter control is realized at the welding position through the reserved position, the welding is carried out at 135 degrees, the section stress characteristic is excellent, the form is simple, the controllability of the freezing section can be effectively realized by the variable section design, the section area is greatly reduced, and the consumption of the freezing refrigerant is reduced;
the freezing pipe is internally provided with a liquid inlet pipe and a liquid return pipe which are connected through a one-way valve, which is the second technical characteristic of the invention. The freezing pipe is provided with a liquid inlet pipe in the middle, a liquid return pipe connected with the freezing pipe through a one-way valve, freezing refrigerants flow in through the liquid inlet pipe, the flow path of the refrigerant media in the freezing pipe can be directionally controlled through the on-off control of the one-way valve, the freezing sections of the freezing pipe can be regulated and controlled, the purpose of differential freezing is achieved, the control of the freezing pipe on a freezing area is greatly improved, and the application range and the construction work efficiency of the freezing pipe are improved.
The pipe wall at the top of the freezing pipe is provided with a second liquid return pipe communicated with the freezing pipe, which is the third technical characteristic of the invention. The freezing pipe is provided with a liquid inlet pipe at the middle position, the freezing refrigerant enters the freezing pipe through the liquid inlet pipe and flows out through the second liquid return pipe through the valve of the partition device, so that a frozen soil curtain is formed in the stratum in a circulating manner, and the refrigerant medium flows in the whole freezing pipe to achieve the purpose of full-section freezing.
The fourth technical characteristic of the invention is that the liquid inlet pipe in the freezing pipe is connected with the first liquid return pipe through a one-way valve, the bottom end of the first liquid return pipe is provided with the one-way valve with a vertically upward water inlet, and the one-way valve is provided with a partition device with a valve. The purpose of the design is that when the refrigerant medium is introduced into the freezing pipe through the liquid inlet pipe, the flow direction path of the refrigerant medium can be controlled through the switch of the one-way valve, the refrigerant medium flows into the valve, and the opening and the closing of different valves are controlled according to the freezing requirement, so that different freezing purposes are achieved. Therefore, the freezing position can be controlled in a segmented mode, the flow direction uniformity of the refrigerant medium in the freezing pipe is improved, the refrigerant circulation is accelerated, and the freezing performance is greatly improved while the freezing area is controlled.
Preferably, the freezing control section at the upper part of the freezing pipe is made of a low-carbon steel seamless steel pipe with the diameter of 165 multiplied by 6mm, and the freezing control section at the lower part is made of a low-carbon steel seamless steel pipe with the diameter of 158 multiplied by 7 mm.
Preferably, the freezing sections of the upper part and the lower part are connected into a whole in a welding mode.
Preferably, the liquid inlet pipe and the liquid return pipe are used for conveying low-temperature refrigerants, in order to prevent cold loss, a polyethylene plastic hose which is good in heat preservation effect and high in flexibility at low temperature is selected, and the diameters of the liquid inlet pipe and the liquid return pipe are 60-80 mm.
Still preferably, the diameter of liquid inlet pipe and liquid return pipe is 70 mm.
Preferably, the partition plate is made of polyvinyl chloride with a good heat preservation effect, and the contact surfaces of the partition plate and the upper-layer control freezing pipe, the liquid inlet pipe and the liquid return pipe are bonded through epoxy resin. The partition plate is used for preventing the low-temperature refrigerant from entering the freezing control section, so that the low-temperature refrigerant is ensured to flow back to the freezing station through the liquid return pipe.
Preferably, the check valve is a swing check valve which is not limited by the installation position.
Still preferably, the one-way valve is selected from the group consisting of: 2,000-15,000 PSI, temperature: -60 +121 ℃ (K, U) swing check valve.
The invention has the following beneficial results:
the invention provides a local difference freezing pipe capable of controlling a freezing section, which is applied to freezing construction, wherein the working principle of a freezing controller is as follows: the low-temperature refrigerant is conveyed to the bottom of the freezer through a liquid inlet pipe and then flows back through a steel pipe of a conventional freezing section, and the low-temperature refrigerant exchanges heat with surrounding soil bodies through the wall of the metal pipe to freeze the surrounding soil layers; when the low-temperature refrigerant flows to the position of the partition plate, the valve is closed, and the low-temperature refrigerant can only flow back to the freezing station through the second one-way valve through the first liquid return pipe due to the blocking effect of the partition plate, so that the control on the lower freezing section is realized; when a low-temperature refrigerant flows in through the liquid inlet pipe, the first one-way valve is opened, and the low-temperature refrigerant flows back to the freezing station through the first one-way valve and the first liquid return pipe, so that the control of the upper freezing section is realized; and when the low-temperature refrigerant flows to the top of the freezing pipe, the low-temperature refrigerant flows back to the freezing station through the second liquid return pipe, so that the freezing pipe is frozen in a whole section. The differential freezing pipe has clear structure, reasonable stress and mature technology, and provides stable technical support for underground engineering. The freezing area is controlled by adopting different control sections, so that the practical applicability of the project is greatly improved, unnecessary cold energy consumption is avoided, and the freezing efficiency is improved. Meanwhile, the consumption of the circulating refrigerant medium and the energy consumption of construction machinery are reduced, the construction method has the outstanding advantages of high construction practicability, capability of meeting the actual engineering requirements, convenience in construction quality control, good reinforcing effect, excellent economy and the like, and has high popularization and application values. After the construction is finished, the freezing pipe, the liquid conveying pipe, the liquid return pipe, the partition device, the valve and the like can be detached, recycled and used, the detachment is simple, the single use of materials is reduced, and the construction cost is effectively reduced.
Drawings
The technical scheme of the invention is further explained by combining the attached drawings.
Fig. 1 is a schematic diagram of a freezing tube structure according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the upper freeze control of the freeze controller according to an embodiment of the present invention.
Fig. 3 is a schematic view of the lower freezing control of the freezing controller according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of freezing controller full segment according to the embodiment of the present invention.
In the figure: 1. a lower freezing section; 2. an upper freezing section; 3. a liquid inlet pipe; 4. a first liquid return pipe; 5. a second liquid return pipe; 6. a partition device; 7. a second one-way valve; 8. a valve; 9. a first one-way valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The invention is described in further detail below with reference to the figures and the embodiments.
Referring to fig. 1, the embodiment of the present invention provides a local differential freezing pipe for controlling a freezing section in freezing construction, which includes an upper freezing control section 2 and a lower freezing control section 1, which are connected together by welding to form a whole through a reserved position, a first liquid inlet pipe 3 connected to a first liquid return pipe 4 through a threaded check valve, and the first liquid inlet pipe is placed in the middle of the freezing pipe. The partition device 6 is positioned at the lower end of the upper freezing control section, and the partition device 6 penetrates through the first liquid inlet pipe 3 and the first liquid return pipe 4 to form a closed environment.
In an embodiment of the present invention, referring to fig. 2, the principle that the differential freezing pipe can perform upper controlled freezing on the stratum is as follows: and closing a valve 8 on the partition device 6, opening a one-way valve 9, allowing the low-temperature refrigerant medium to enter the freezing pipe through the liquid inlet pipe 3 and gradually fill the upper control area of the freezing pipe, and allowing the low-temperature refrigerant medium to be discharged through the first liquid return pipe through the one-way valve 9 and flow into the freezing station. The low-temperature refrigerant does not pass through the freezing pipe at the lower part, and the cold energy at the lower part does not exchange heat with the stratum. The low-temperature refrigerant is in contact with the metal pipe wall of the upper freezing section 2, and the low-temperature refrigerant exchanges heat with the surrounding soil body through the metal pipe wall, so that the upper surrounding soil layer is frozen.
In an embodiment of the present invention, referring to fig. 3, the principle that the differential freezing pipe can perform the lower controlled freezing of the stratum is as follows: the valve 8 of the shut-off device 6 is closed and the non-return valve 9 is closed. The low-temperature refrigerant medium is gradually filled in the lower part of the freezing pipe through the first liquid inlet pipe, and due to the blocking effect of the blocking device 6, the low-temperature refrigerant can only flow back to the freezing station through the check valve 7 at the lower end of the first liquid return pipe 4, so that the low-temperature refrigerant is prevented from directly contacting with the metal pipe wall of the upper freezing control section 2, the low-temperature refrigerant cannot contact with the pipe wall of the control freezer 2, the upper stratum cannot be frozen, the frost heaving of the upper stratum is well controlled, and the lower stratum soil performs heat exchange with the metal pipe wall of the lower freezing control section 1, so that the freezing of the soil around the lower part is realized.
In an embodiment of the present invention, referring to fig. 4, the principle that the differential freezing pipe can perform full-section freezing on the stratum is as follows: and opening a valve 8 of the partition device 6, closing the first one-way valve 9 and the second one-way valve 7, enabling the low-temperature refrigerant medium to flow into the freezing pipe through the liquid inlet pipe and gradually fill the whole freezing pipe, enabling the low-temperature refrigerant to flow back to the freezing station only through the second liquid return pipe 5, and circulating the processes so that the soil layer around the freezing pipe is frozen to form a frozen soil curtain to freeze the soil layer.
The working principle of the control freezer is as follows: the low-temperature refrigerant is conveyed to the bottom of the freezer through a liquid inlet pipe and then flows back through a steel pipe of the freezing section, and the low-temperature refrigerant exchanges heat with the surrounding soil body through the wall of the metal pipe to freeze the surrounding soil layer; when the low-temperature refrigerant flows to different preset positions, the low-temperature refrigerant flows back to the freezing station through the designed specific backflow line through the liquid return pipe due to the blocking effect of the partition plate and the flow direction control of the one-way valve, so that the low-temperature refrigerant is prevented from directly contacting with the metal pipe wall of the freezing pipe after entering the freezing pipe, and different freezing of different positions is realized.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A local difference freezing pipe comprises two freezing section control freezing sections, a liquid inlet pipe and a first liquid return pipe, wherein the liquid inlet pipe and the first liquid return pipe are arranged in the freezing section control freezing pipe; a second liquid return pipe is arranged at the position of the upper freezing section, and the second liquid return pipe is of an integral structure on the pipe wall of the freezing pipe;
the first liquid return pipe is connected with the liquid inlet pipe through a threaded check valve; the freezing pipe is arranged along the central line in the freezing pipe, so that the pipe wall and the liquid return pipe are kept at a certain distance, and the cold energy is prevented from being directly diffused to the stratum through the pipe wall; the bottom of the first liquid return pipe is provided with a one-way valve for controlling the outflow of refrigerant medium;
a partition device is arranged at the upper part of the variable cross section of the freezing pipe, and the liquid return pipe and the liquid inlet pipe penetrate through the partition device; it is characterized in that the isolating device is provided with a one-way valve for controlling the flow direction of the low-temperature refrigerant.
2. The freezing tube of claim 1, wherein said freezing tube comprises an upper freezing control section and a lower freezing control section, and a pre-set position is preset in the freezing tubes butted with each other and an inner hoop is welded.
3. The freezing pipe according to claim 1, wherein the partition means is made of polyvinyl chloride with good heat-insulating effect, and the contact surfaces of the partition plate and the upper freezing control pipe, the liquid inlet pipe and the liquid return pipe are bonded by epoxy resin.
4. The liquid inlet pipe and the liquid return pipe of claim 1 are used for conveying low-temperature refrigerants, and in order to prevent cold loss, polyethylene plastic hoses with good heat preservation effects and high flexibility at low temperature are selected.
5. The differential freezing application mode of the freezing pipe at different levels according to claim 1, wherein the liquid inlet pipe, the first liquid return pipe and the partition device check valve control the flow direction of different low-temperature refrigerant media, and the freezing control at different levels is realized through a preset flow path.
6. A freezing tube as claimed in claim 1, wherein said check valve is a swing check valve which is not restricted by the installation position.
7. The freezing tube of claim 1 or 2, wherein the freezing tube material is a low carbon steel seamless steel tube, and the diameter of the upper freezing control section is larger than that of the lower freezing control section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110397857.1A CN112922002A (en) | 2021-04-14 | 2021-04-14 | Local difference freezing pipe capable of controlling freezing section applied to freezing construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110397857.1A CN112922002A (en) | 2021-04-14 | 2021-04-14 | Local difference freezing pipe capable of controlling freezing section applied to freezing construction |
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| Publication Number | Publication Date |
|---|---|
| CN112922002A true CN112922002A (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110397857.1A Pending CN112922002A (en) | 2021-04-14 | 2021-04-14 | Local difference freezing pipe capable of controlling freezing section applied to freezing construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114541368A (en) * | 2022-02-15 | 2022-05-27 | 淮北矿业股份有限公司 | Liquid nitrogen difference freezers |
-
2021
- 2021-04-14 CN CN202110397857.1A patent/CN112922002A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114541368A (en) * | 2022-02-15 | 2022-05-27 | 淮北矿业股份有限公司 | Liquid nitrogen difference freezers |
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