Large-section rectangular pipe freezing receiving method

Abstract

The application discloses a large-section rectangular top pipe freezing receiving method, which comprises the following steps: constructing freezing holes around a hole opening and installing horizontal freezing pipes in the freezing holes; constructing hot brine circulating holes near the peripheral underground pipelines and connecting the hot brine circulating holes with a hot brine circulating device; arranging temperature measuring sensors in a rectangular top pipe machine and inserting temperature probes around the hole opening; starting the horizontal freezing pipes and the hot brine circulating device to keep the temperature of the soil near the underground pipelines while forming a freezing wall around the hole opening; removing the freezing wall; after the removal is completed, pouring water in a receiving well, and receiving the rectangular top pipe machine under water; discharging the water in the receiving well, and solidifying the shell of the rectangular top pipe machine with the hole opening. The hot brine circulating holes are arranged to alleviate the thermal expansion and cold contraction phenomenon near the soil, and prevent the freezing process from damaging the underground pipelines in the peripheral soil. Moreover, the water is poured in the receiving well to accelerate the cold loss, thereby accelerating the hole opening thawing process and reducing the thawing waiting time.

Description

Technical Field

[0001] This invention relates to a method for freezing and receiving large-section rectangular jacking pipes in the field of pipe jacking construction technology. Background Technology

[0002] With the rapid development of China's economy and the acceleration of urbanization, urban construction has entered a period of rapid development. The increasingly prosperous cities provide less and less time for construction, making construction more and more difficult. For short-distance urban underground passages, pipe jacking is increasingly being used in urban construction due to its advantages such as less impact on surface traffic and smaller occupation of machinery and construction sites. However, the reception of the pipe jacking machine is the most difficult aspect to control during the pipe jacking process.

[0003] When constructing integrated utility tunnels, underground passages, and subway entrances in cities, the impact of existing surface structures, underground pipelines, and current traffic on the construction site restricts the vertical reinforcement of the pipe jacking receiving end on the ground, often resulting in the pipe jacking machine having to be abandoned for reception. Furthermore, during the process of chiseling out the opening to receive the pipe jacking machine, the lack of structural reinforcement in the center of the opening easily leads to structural deformation such as settlement during the chiseling process, which is particularly prone to occur during the chiseling of large-section openings. Therefore, current methods include cooling and freezing the opening area to reduce soil fluidity, increase the structural strength of the opening, and thus allow sufficient time for the opening chiseling.

[0004] However, the current freezing method is mainly through freezing pipes, which makes it difficult to control the freezing temperature. If the freezing temperature is too low, more time is needed for thawing. Since the pipe jacking machine can only leave the tunnel after the opening is completely thawed, the excessive thawing time will affect the construction efficiency. Moreover, the construction party often only focuses on the freezing effect and ignores the safety of underground pipelines in the surrounding soil. Excessive freezing can easily cause the collapse of the surrounding underground pipelines. Summary of the Invention

[0005] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a method for receiving frozen large-section rectangular jacking pipes, which can make the freezing process more controllable and reduce the impact of the freezing process on surrounding existing facilities.

[0006] According to an embodiment of the present invention, a method for receiving frozen large-section rectangular jacking pipes is provided, comprising:

[0007] The rectangular pipe jacking machine is ready to reach the receiving well and stops jacking before the opening, waiting for the opening to be removed;

[0008] Multiple freezing holes are constructed around the opening, and horizontal freezing pipes are installed in each of the freezing holes;

[0009] Construct hot brine circulation holes near surrounding underground pipelines, with hot brine circulation equipment connected to the external hot brine circulation holes;

[0010] A temperature sensor is installed inside the rectangular pipe jacking machine, and a temperature probe is inserted around the opening. The temperature inside and outside the rectangular pipe jacking machine is obtained through the temperature sensor and the temperature probe.

[0011] Multiple horizontal freezing pipes and the hot brine circulation equipment are activated to maintain the temperature of the soil near the underground pipeline while forming a frozen wall at the tunnel entrance.

[0012] The freezing condition of the frozen wall is determined by the temperature sensor and the temperature probe, and the frozen wall is then removed.

[0013] Once the frozen wall has been removed, the horizontal freezing pipe is shut off.

[0014] Water is poured into the receiving well so that the water level is higher than the top of the opening, which accelerates the thawing of the soil.

[0015] Once the soil has thawed, the rectangular pipe jacking machine continues to advance and completes the pipe jacking reception underwater.

[0016] The water in the receiving well is drained, the outer shell of the rectangular pipe jacking machine is fixed to the opening, and the internal structure of the rectangular pipe jacking machine is dismantled and transported along the pipeline to the starting well for hoisting.

[0017] According to an embodiment of the present invention, the plurality of freezing holes are arranged in an array at equal intervals around the opening.

[0018] According to an embodiment of the present invention, the opening direction of the freezing hole is parallel to the direction of the pipe.

[0019] According to an embodiment of the present invention, after the horizontal freezing tube is inserted into the freezing hole, a sealing cap is installed at the opening of the freezing hole to reduce the loss of cold energy from the opening of the freezing hole.

[0020] According to an embodiment of the present invention, before freezing begins, the average freezing temperature is determined based on the magnitude of the load borne by the frozen wall or the excavation depth, and the minimum brine temperature and the density of the calcium chloride solution are determined by combining the average freezing temperature with the geological environment to prepare for freezing.

[0021] According to an embodiment of the present invention, the rectangular pipe jacking machine is further provided with a humidity sensor and a flow rate sensor, which are used to comprehensively judge the dryness, water flow and temperature conditions inside the rectangular pipe jacking machine, and to determine whether the outer shell of the rectangular pipe jacking machine and the opening are frozen into a closed space.

[0022] According to an embodiment of the present invention, during the process of removing the frozen wall, heat insulation facilities are installed near the opening to reduce the loss of cold energy.

[0023] According to an embodiment of the present invention, during the soil thawing process, the rectangular pipe jacking machine is internally heated to transfer heat to the soil to accelerate thawing.

[0024] According to an embodiment of the present invention, during the thawing process of the soil, the gap between the soil and the outer shell of the rectangular pipe jacking machine is monitored to prevent excessive gap from causing water leakage during subsequent water injection.

[0025] According to an embodiment of the present invention, further, during the thawing process of the soil, if the gap between the soil and the outer shell of the rectangular pipe jacking machine is too large, grouting is performed in the gap to fill the void.

[0026] The beneficial effects of the embodiments of the present invention include at least the following: the present invention mitigates the thermal expansion and contraction of the soil by setting up hot brine circulation holes, preventing damage to underground pipes in the surrounding soil during the freezing process; moreover, by injecting water into the receiving well to accelerate the dissipation of cold energy, the thawing process at the opening is accelerated, reducing the waiting time for thawing. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the arrangement of freezing holes in the large-section rectangular jacking pipe freezing and receiving method according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the arrangement of temperature sensors in the rectangular pipe jacking machine in the large-section rectangular pipe jacking freezing and receiving method of the present invention;

[0030] Figure 3 This is a side view of the freezing hole in the large cross-section rectangular jacking pipe freezing and receiving method according to an embodiment of the present invention.

[0031] Attached reference numerals: 100-rectangular pipe jacking machine, 200-opening, 210-frozen wall, 300-freezing hole, 310-horizontal freezing pipe, 400-temperature sensor, 500-temperature probe. Detailed Implementation

[0032] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0034] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0036] This invention provides a method for freezing and receiving large-section rectangular pipe jacking machines. After freezing is completed and the frozen wall 210 is removed, water is injected into the receiving well to accelerate thawing, allowing the rectangular pipe jacking machine 100 to contact and solidify with the surrounding soil more quickly, facilitating subsequent pipe jacking reception. Compared to traditional freezing methods, this method reduces thawing time, thus minimizing obstacles to subsequent pipe jacking reception. Furthermore, hot brine circulation holes are provided in the surrounding soil, which circulate hot brine. Combined with external hot brine circulation equipment, this raises the temperature of the surrounding soil, reducing damage to existing underground pipelines and making the construction environment more environmentally friendly.

[0037] Reference Figure 1 The method for freezing and receiving large-section rectangular jacking pipes in this embodiment of the invention includes the following steps:

[0038] S100. The rectangular pipe jacking machine 100 advances the pipe and stops jacking before reaching the receiving well at the tunnel entrance 200, leaving a section of soil to freeze and be removed to prevent the structure at the tunnel entrance 200 from collapsing if the advance continues.

[0039] S200.Reference Figure 3 Multiple freezing holes 300 are constructed around the opening 200, and horizontal freezing pipes 310 are installed in each freezing hole 300. The horizontal freezing pipe 310 is a device capable of generating cooling capacity, which is connected to external refrigeration equipment to guide gas or liquid carrying cooling capacity through it. The horizontal freezing pipe 310 is existing technology, and its specific refrigeration structure and process will not be described in detail here.

[0040] S300. Construct hot brine circulation holes near surrounding underground pipelines or other areas heavily affected by frost heave to control the impact of frost heave on the surrounding environment. Connect the hot brine circulation holes to external hot brine circulation equipment. When the hot brine circulation equipment is activated, it can deliver heated hot brine to the hot brine circulation holes, forming a circulation structure with the holes. The heat carried by the hot brine offsets the cold generated by the horizontal freezing pipe 310, thereby reducing the impact on underground pipelines and minimizing the contraction of underground pipelines due to excessively low surrounding soil temperatures.

[0041] S400.Reference Figure 2 A temperature sensor 400 is installed inside the rectangular pipe jacking machine 100, and a temperature probe 500 is inserted around the opening 200. The temperature inside and outside the rectangular pipe jacking machine 100 is obtained through the temperature sensor 400 and the temperature probe 500, which facilitates the assessment of the degree of freezing.

[0042] S500. Start the horizontal freezing pipe 310 and the hot brine circulation equipment. The horizontal freezing pipe 310 freezes the wall surface blocking the opening 200 to form a frozen wall 210. At the same time, the hot brine output by the hot brine circulation equipment maintains the temperature of the soil near the underground pipeline and reduces the impact of the low temperature generated during the freezing process on the underground pipeline.

[0043] S600. The freezing status of the frozen wall 210 is obtained through the temperature sensor 400 and the temperature probe 500, so as to adjust the freezing temperature and freezing time in a timely manner. After the frozen wall 210 has been frozen and reached the predetermined strength, and it is confirmed that the pipeline is not connected to the groundwater outside the frozen wall 210, the frozen wall 210 is removed.

[0044] S700. After removing the frozen wall 210, close the horizontal freezing pipe 310. Since the outer shell of the rectangular pipe jacking machine 100 is still fixed to the opening 200 at this time, receiving the pipe under thawing conditions can easily lead to soil backflow, causing soil to enter the receiving well along with the rectangular pipe jacking machine 100, resulting in ground subsidence above. Therefore, the rectangular pipe jacking machine 100 can only continue moving to complete the receiving process after the soil near the opening 200 has thawed.

[0045] S800. Water is poured into the receiving well so that the water level is higher than the top of the tunnel opening 200 and completely submerges the rectangular pipe jacking machine 100, thereby accelerating the thawing of the soil. It is easy to understand that other liquids can also be used to accelerate the thawing of the soil, which will not be elaborated here.

[0046] S900. Once the soil thawing is complete, the rectangular pipe jacking machine 100 continues to advance and completes the pipe jacking reception underwater, avoiding situations such as the collapse of the main road due to soil loss above after pushing the rectangular pipe jacking machine 100.

[0047] S1000. Drain the water from the receiving well. The outer shell of the rectangular pipe jacking machine 100 is fixed to the opening 200 to form one of the structures of the opening 200. The internal structure of the rectangular pipe jacking machine 100 is dismantled and transported along the pipeline to the starting well for hoisting. Pipe jacking reception is completed.

[0048] Furthermore, when constructing the freezing holes 300, the freezing holes 300 are arranged equidistantly and in an array around the opening 200, so that the cold source can be evenly distributed around the opening 200 during freezing, ensuring that the opening 200 is frozen uniformly, reducing the impact of localized low temperatures on the soil structure, and also improving freezing efficiency. Specifically, the direction of each freezing hole 300 is parallel to the direction of the pipeline, so that the cold energy generated from the freezing holes 300 can be evenly distributed on the pipeline.

[0049] Furthermore, after the horizontal freezing tube 310 is inserted into the freezing hole 300, a sealing cap is installed at the opening of the freezing hole 300, thereby sealing the horizontal freezing tube 310 in the freezing hole 300, reducing the loss of cold energy from the opening and thus reducing the freezing efficiency.

[0050] Furthermore, before the freezing work begins, the average freezing temperature is determined based on the load-bearing capacity or excavation depth of the frozen wall 210. The minimum brine temperature and the density of the calcium chloride solution are determined by combining the average freezing temperature with the geological environment in preparation for freezing, thereby preventing the freezing temperature from being too low and affecting the structure of the frozen wall 210.

[0051] Furthermore, the rectangular pipe jacking machine 100 is also equipped with a humidity sensor and a flow rate sensor. Combined with the temperature sensor 400, it can comprehensively judge the dryness, water flow and temperature conditions inside the rectangular pipe jacking machine 100, determine whether the outer shell of the rectangular pipe jacking machine 100 and the opening 200 are frozen into a closed space, and whether there is any leakage, so as to fill the leakage in time.

[0052] Furthermore, during the removal of the frozen wall 210, thermal insulation facilities are installed near the opening 200, specifically an insulation structure surrounded by insulation pads, to reduce the loss of cold energy and thus reduce energy consumption.

[0053] Furthermore, during the soil thawing process, the interior of the rectangular pipe jacking machine 100 is also heated by a heating device. Thus, while the external cold is absorbed by water injection, the interior of the rectangular pipe jacking machine 100 also generates heat to consume the cold near the opening 200, thereby improving the thawing efficiency.

[0054] Furthermore, during the soil thawing process, the soil structure tends to loosen as thawing occurs, potentially increasing the gap between the soil and the outer shell of the rectangular pipe jacking machine 100. This could cause water in the receiving well to leak into the pipe through the gap. Therefore, it is necessary to monitor the gap in real time to prevent leakage. When a risk of leakage is detected, grouting should be performed in the gap to fill the void.

[0055] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A method for receiving frozen large-section rectangular jacking pipes, characterized in that, include: The rectangular pipe jacking machine (100) is ready to reach the receiving well and stops jacking before the opening (200) and waits for the opening (200) to be removed; Multiple freezing holes (300) are constructed around the opening (200), and horizontal freezing pipes (310) are installed in each of the freezing holes (300). Construct hot brine circulation holes near surrounding underground pipelines, with hot brine circulation equipment connected to the external hot brine circulation holes; A temperature sensor (400) is installed inside the rectangular pipe jacking machine (100), and a temperature probe (500) is inserted around the opening (200). The temperature inside and outside the rectangular pipe jacking machine (100) is obtained through the temperature sensor (400) and the temperature probe (500). Multiple horizontal freezing pipes (310) and the hot brine circulation equipment are activated to form a frozen wall (210) at the opening (200) while maintaining the temperature of the soil near the underground pipeline; The freezing status of the frozen wall (210) is determined by the temperature sensor (400) and the temperature probe (500); a heat insulation facility is set up near the opening (200) to reduce the loss of cold energy, and the heat insulation facility is a heat insulation structure surrounded by a heat insulation pad; the frozen wall (210) is removed. After the frozen wall (210) is removed, the horizontal freezing pipe (310) is closed. Water was poured into the receiving well so that the water level was higher than the top of the opening (200) to accelerate the thawing of the soil; Once the soil has thawed, the rectangular pipe jacking machine (100) continues to advance and completes the pipe jacking reception underwater; The water in the receiving well is drained, the outer shell of the rectangular pipe jacking machine (100) is fixed to the opening (200), the internal structure of the rectangular pipe jacking machine (100) is dismantled and transported along the pipeline to the starting well for hoisting.

2. The method for freezing and receiving large-section rectangular jacking pipes according to claim 1, characterized in that: Multiple freezing holes (300) are arranged in an array at equal intervals around the opening (200).

3. The method for freezing and receiving large-section rectangular jacking pipes according to claim 1, characterized in that: The freezing hole (300) is opened in a direction parallel to the direction of the pipeline.

4. The method for freezing and receiving large-section rectangular jacking pipes according to claim 1, characterized in that: After the horizontal freezing tube (310) is inserted into the freezing hole (300), a sealing cap is installed at the opening of the freezing hole (300) to reduce the loss of cold energy from the opening of the freezing hole (300).

5. The method for freezing and receiving large-section rectangular jacking pipes according to claim 1, characterized in that: Before freezing begins, the average freezing temperature is determined based on the load on the frozen wall (210) or the excavation depth, and the minimum brine temperature and the density of the calcium chloride solution are determined by combining the average freezing temperature with the geological environment in preparation for freezing.

6. The method for freezing and receiving large-section rectangular jacking pipes according to claim 1, characterized in that: The rectangular pipe jacking machine (100) is also equipped with a humidity sensor and a flow rate sensor, which are used to comprehensively judge the dryness, water flow and temperature inside the rectangular pipe jacking machine (100) and to determine whether the outer shell of the rectangular pipe jacking machine (100) and the opening (200) are frozen into a closed space.

7. The method for freezing and receiving large-section rectangular jacking pipes according to claim 1, characterized in that: During the soil thawing process, the rectangular pipe jacking machine (100) is internally heated to transfer heat to the soil to accelerate thawing.

8. The method for freezing and receiving large-section rectangular jacking pipes according to claim 1, characterized in that: During the thawing process of the soil, the gap between the soil and the outer shell of the rectangular pipe jacking machine (100) is monitored to prevent excessive gap from causing water leakage during subsequent water injection.

9. The method for freezing and receiving large-section rectangular jacking pipes according to claim 8, characterized in that: During the thawing process, if the gap between the soil and the outer shell of the rectangular pipe jacking machine (100) is too large, grouting is performed in the gap to fill the void.

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