Energy tunnel duct piece integrated with geothermal exchange function and manufacturing and assembling method of energy tunnel duct piece

Abstract

The invention provides an energy tunnel segment integrated with a geothermal exchange function and a manufacturing and assembling method thereof. The energy tunnel segment integrated with the geothermal exchange function comprises a steel reinforcement framework, and a segment body formed through concrete pouring is arranged on the outer side of the steel reinforcement framework; the steel reinforcement framework is provided with pipe piece main reinforcements, pipe piece stirrups and pipe piece auxiliary reinforcements which are bound together; a duct piece bolt component is pre-buried in the duct piece main body; a heat exchange tube component is pre-buried in the soil-back side of the duct piece main body, a first connecting piece and a second connecting piece which are matched with each other are arranged at the two connecting ends of the duct piece main body respectively, and the two ends of the heat exchange tube component are communicated with the first connecting piece and the second connecting piece respectively; in the invention, deep integration of a tunnel structure and a terrestrial heat collection function is realized, and underground low-grade heat energy is stably converted into practical energy; refrigeration and heat supply energy consumption of the subway public area is obviously reduced, tunnel waste heat accumulation is synchronously eliminated, and the interval thermal environment is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground engineering, and in particular relates to an energy tunnel segment with integrated geothermal exchange function and a manufacturing and assembling method thereof. Background Art

[0002] Existing tunnels only serve transportation and municipal functions. Train operation and equipment heat dissipation cause a large amount of waste heat to accumulate inside the tunnel, which not only wastes energy but also requires additional energy consumption for cooling.

[0003] Cities rich in geothermal resources generally face a shortage of underground space. Laying individual geothermal wells is costly and restrictive. Furthermore, post-installing heat exchange systems within tunnels compromises structural integrity and reduces durability. On-site welding of heat exchange tubes is inefficient and lacks sealing. Furthermore, existing tunnel segments lack standardized heat exchange unit designs during the prefabrication phase. Summary of the Invention

[0004] In response to the deficiencies in the prior art, the present invention provides an energy tunnel segment with integrated geothermal exchange function, which integrates the tunnel structure with geothermal collection function, reduces construction complexity, and ensures system sealing, as well as a manufacturing and assembly method thereof.

[0005] The technical solution of the present invention is as follows: an energy tunnel segment with integrated geothermal heat exchange function comprises a steel skeleton, a segment body formed by pouring concrete is arranged on the outside of the steel skeleton; the steel skeleton comprises segment main reinforcement, segment stirrups and segment auxiliary reinforcement bound together; segment bolt components are pre-embedded in the segment body; a heat exchange tube component is pre-embedded inside the back-soil side of the segment body, and the two connecting ends of the segment body are respectively provided with a matching first connecting piece and a second connecting piece, and the two ends of the heat exchange tube component are respectively connected to the first connecting piece and the second connecting piece.

[0006] Furthermore, the heat exchange tube components are laid in an "S" shape inside the tube body, and the heat exchange tube components are tied and fixed to the steel frame.

[0007] Furthermore, the heat exchange pipe component is a HDPE heat exchange pipe.

[0008] Furthermore, the heat exchange tube component is a Φ25mm HDPE heat exchange tube; the curvature radius of the heat exchange tube component is 150mm, and the spacing between the heat exchange tube components is 80±5mm.

[0009] Furthermore, the first connecting member is a stepped structure pre-buried in one connecting end of the tube sheet body, the interior of the first connecting member is hollow and communicated with the end of the heat exchange tube member, and the second connecting member is a box-shaped structure pre-buried in the other connecting end of the tube sheet body, the interior of the second connecting member is communicated with the end of the heat exchange tube member, and the interior of the second connecting member has an inverted trapezoidal cavity matching the first connecting member.

[0010] Furthermore, the side length of the upper bottom surface of the first connecting member is 30 mm, the side length of the lower bottom surface of the first connecting member is 50 mm, the height of the first connecting member is 40 mm; and the end of the second connecting member protrudes 5 mm from the end of the pipe segment body.

[0011] Furthermore, a sealing ring matching the first connecting member is embedded in the second connecting member.

[0012] Furthermore, a resistance wire is provided inside the second connecting member, and the resistance wire is used to electrically fuse the first connecting member and the second connecting member together after being energized.

[0013] A method for manufacturing an energy tunnel segment with integrated geothermal heat exchange function comprises the following steps:

[0014] Determine the optimal curvature radius of heat exchange tube components;

[0015] Fabrication and installation of segment reinforcement skeleton;

[0016] Lay the heat exchange pipe components in an "S" shape in the steel frame and tie them in place;

[0017] Install the first connector and the second connector at the corresponding positions of the two connecting ends of the tube body, and connect the first connector and the second connector to the two ends of the heat exchange tube component;

[0018] Concrete pouring, curing, demoulding and post-curing.

[0019] The method for assembling energy tunnel segments with integrated geothermal heat exchange function comprises the following steps:

[0020] Position the ring blocks, number the segments according to the installation sequence, hoist the segments in the order of numbering, and assemble them with staggered seams;

[0021] Segment splicing: the hydraulic jack pushes the segment to the predetermined position, and the first connector and the second connector are self-guided and engaged;

[0022] Connector welding, welding the first connector and the second connector together by electrofusion welding;

[0023] Sealing verification: inject 0.8MPa pressure water into the heat exchange tube component, maintain the pressure for 15 minutes, and measure the pressure drop ≤ 0.02MPa to determine the quality;

[0024] The energy tunnel system is in operation, injecting heat exchange medium into the heat exchange tube components and connecting them to heat pumps. The heat pumps improve the geothermal quality, extracting heat from the rock and soil in winter to heat the subway station, and discharging waste heat into the rock and soil in summer.

[0025] Beneficial effects of the present invention:

[0026] (1) The present invention achieves deep integration of tunnel structure and geothermal collection function, stably converting low-grade underground thermal energy into practical energy; significantly reducing the energy consumption of cooling and heating in public areas of the subway, simultaneously eliminating the accumulation of waste heat in the tunnel, and improving the thermal environment of the section;

[0027] (2) Factory prefabricated integrated heat exchange system ensures the structural integrity of the energy segments and the sealing of the heat exchange tubes, avoids on-site construction damage, and improves project reliability;

[0028] (3) Reduce the cost of traditional geothermal well construction, realize the intensive utilization of underground space resources, and significantly shorten the on-site installation period through prefabrication technology, thereby reducing the overall construction and maintenance costs;

[0029] (4) Replace fossil energy heating, effectively reduce carbon emissions and air pollutant emissions, and help optimize the thermal balance of urban microenvironment through geothermal-waste heat coordinated regulation;

[0030] (5) Applicable to different geological conditions (water-rich layers / rock layers) and tunnel types (subway / municipal tunnels), the modular design supports seamless integration with building energy systems, expanding clean energy application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of a pipe segment of an energy tunnel with integrated geothermal heat exchange function in the present invention.

[0032] Figure 2 This is a schematic diagram of the structure of another pipe segment of an energy tunnel with integrated geothermal heat exchange function in the present invention.

[0033] Figure 3 This is a flow chart of the method for assembling energy tunnel segments with integrated geothermal heat exchange function in the present invention. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention, its application, or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully convey the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and numerical values set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0035] The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are simply used to distinguish different parts. Terms such as "include" or "comprising" mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0036] like Figure 1 and 2 As shown, the energy tunnel segment with integrated geothermal heat exchange function includes a steel skeleton, with a segment body formed by pouring concrete arranged on the outside of the steel skeleton; the steel skeleton has segment main reinforcement 1, segment stirrups 2 and segment auxiliary reinforcement 3 bound together; segment bolt components 4 are pre-embedded in the segment body; a heat exchange tube component 6 is pre-embedded inside the back-soil side of the segment body, and the two connecting ends of the segment body are respectively provided with a matching first connecting piece 5 and a second connecting piece 7, and the two ends of the heat exchange tube component 6 are respectively connected to the first connecting piece 5 and the second connecting piece 7.

[0037] In the above embodiment, a heat exchange component 6 is pre-embedded inside the main body of the segment to achieve deep integration of the tunnel structure and geothermal collection function, stably converting low-grade underground thermal energy into practical energy, which is beneficial to significantly reduce the energy consumption of cooling and heating in public areas of the subway, simultaneously eliminate the accumulation of waste heat in the tunnel, and improve the thermal environment of the interval; the factory-prefabricated integrated heat exchange system ensures the structural integrity of the energy segment and the sealing of the heat exchange tube, avoids on-site construction damage, and improves project reliability; reduces the cost of separate construction of traditional geothermal wells, realizes intensive utilization of underground space resources, and the prefabrication process significantly shortens the on-site installation cycle and reduces the overall construction and maintenance costs; replaces fossil energy for heating, effectively reduces carbon emissions and air pollutant emissions, and helps optimize the thermal balance of the urban microenvironment through coordinated regulation of geothermal and waste heat; is suitable for different geological conditions (aquifers / rock formations) and tunnel types (subways / municipal tunnels), and the modular design supports seamless integration with building energy systems, expanding the application scenarios of clean energy.

[0038] In some embodiments, the heat exchange tube component 6 is laid in an "S" shape inside the tube body. The "S"-shaped heat exchange tube component 6 can provide a larger heat exchange area, improve geothermal energy collection, and the heat exchange tube component 6 is tied and fixed to the steel frame; specifically, the heat exchange tube component 6 is fixed to the steel frame with a cable tie, and the heat exchange tube component 6 should avoid the bolt holes and the tube bolt components 4 to ensure that the heat exchange tube component 6 is firm, stable and without deformation during the vibration and pouring process.

[0039] In some embodiments, the heat exchange tube component 6 is a HDPE heat exchange tube; HDPE heat exchange tube has good chemical corrosion resistance, and has good flexibility and resistance to slow crack growth. Even in the low temperature environment of cold areas in winter, HDPE pipes still maintain good toughness and impact resistance and are not easy to crack; HDPE heat exchange tubes are very soft, easy to bend and lay, and their inner walls are smooth, with a low friction coefficient and small resistance loss when transporting fluids. At the same flow rate, the required pump power is lower, and the operating energy consumption is more economical.

[0040] In some embodiments, the heat exchange tube component 6 is a Φ25mm HDPE heat exchange tube. Heat exchange tubes of this specification achieve a good balance between ensuring sufficient heat exchange area and controlling flow resistance in the tube; the curvature radius of the heat exchange tube component is 150mm, and the spacing between the heat exchange tube components is 80±5mm.

[0041] In some embodiments, the first connecting member 5 is a step structure embedded in one connection end of the tube body. The interior of the first connecting member 5 is hollow and connected to the end of the heat exchange tube member 6. The second connecting member 7 is a box-shaped structure embedded in the other connection end of the tube body. The interior of the second connecting member 7 is connected to the end of the heat exchange tube member 6. The interior of the second connecting member 7 has an inverted trapezoidal cavity that matches the first connecting member 5. The first connecting member 5 with the step structure is positioned in coordination with the second connecting member 7 with the inverted trapezoidal cavity that matches the first connecting member 5, which greatly improves the assembly tolerance rate and ensures that the heat exchange channels between the tube sheets are quickly and accurately connected.

[0042] In some embodiments, a specific implementation of the first connecting member 5 and the second connecting member 7 is that the side length of the upper bottom surface of the first connecting member 5 is 30 mm, the side length of the lower bottom surface of the first connecting member 5 is 50 mm, and the height of the first connecting member 5 is 40 mm; the end of the second connecting member 7 protrudes 5 mm from the end of the pipe segment body.

[0043] In some embodiments, a sealing ring matching the first connecting member 5 is embedded in the second connecting member 7; specifically, the sealing ring is a rubber sealing ring; more specifically, the sealing ring is a rubber sealing ring with a diameter of 3 mm.

[0044] In some embodiments, a resistance wire is provided inside the second connecting member 7, and the resistance wire is used to electrofusion weld the first connecting member 5 and the second connecting member 7 together after being energized; after the first connecting member 5 and the second connecting member 7 between the pipe segments are correspondingly connected, the resistance wire inside the second connecting member 7 is energized through the embedded cable to complete the electric fusion welding; specifically, 220V electricity is passed through the resistance wire for 30 seconds to complete the electric fusion welding.

[0045] In some embodiments, a method for manufacturing an energy tunnel segment with integrated geothermal heat exchange function is disclosed, comprising the following steps:

[0046] Determine the optimal curvature radius of the heat exchange pipe components based on parameters such as thermal conductivity and water content of the rock and soil along the tunnel;

[0047] Fabrication and installation of segment reinforcement skeleton;

[0048] Lay the heat exchange pipe components in an "S" shape in the steel frame and tie them in place;

[0049] Install the first connector and the second connector at the corresponding positions of the two connecting ends of the tube body, and connect the first connector and the second connector to the two ends of the heat exchange tube component;

[0050] Concrete pouring, curing, demoulding and post-curing.

[0051] In some embodiments, as Figure 3 As shown, a method for assembling energy tunnel segments with integrated geothermal heat exchange function is disclosed, comprising the following steps:

[0052] Position the ring blocks, number the segments according to the installation sequence, hoist the segments in the order of numbering, and assemble them with staggered seams;

[0053] Segment splicing: the hydraulic jack pushes the segment to the predetermined position, and the first connector and the second connector are self-guided and engaged;

[0054] Connector welding, welding the first connector and the second connector together by electrofusion welding;

[0055] Sealing verification: inject 0.8MPa pressure water into the heat exchange tube component, maintain the pressure for 15 minutes, and measure the pressure drop ≤ 0.02MPa to determine the quality;

[0056] The energy tunnel system is in operation, injecting heat exchange medium into the heat exchange tube components and connecting them to heat pumps. The heat pumps improve the geothermal quality, extracting heat from the rock and soil in winter to heat the subway station, and discharging waste heat into the rock and soil in summer.

[0057] In the above embodiment, the segment rings and blocks are numbered, a staggered assembly process is adopted, and an integrated construction process of on-site electric fusion connection and water pressure testing is adopted to minimize the risk of leakage; specifically, the heat exchange medium injected into the heat exchange tube component is a 25% ethylene glycol solution.

[0058] Thus far, various embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details well known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0059] The above-described embodiments represent only some embodiments of the present invention. Although the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be based on the appended claims.

Claims

1. An energy tunnel segment with integrated geothermal heat exchange function, characterized by: It includes a steel frame, and a segment body formed by pouring concrete is arranged on the outside of the steel frame; The steel skeleton comprises segment main reinforcement, segment stirrups and segment auxiliary reinforcement that are tied together; Segment bolt components are pre-embedded in the segment body; A heat exchange tube component is pre-buried inside the back-of-soil side of the tube segment body. The two connecting ends of the tube segment body are respectively provided with a matching first connecting piece and a second connecting piece. The two ends of the heat exchange tube component are respectively connected to the first connecting piece and the second connecting piece.

2. The energy tunnel segment with integrated geothermal heat exchange function according to claim 1 is characterized in that: The heat exchange tube components are laid in an "S" shape inside the tube body, and are tied and fixed to the steel frame.

3. The energy tunnel segment with integrated geothermal heat exchange function according to claim 2 is characterized in that: The heat exchange pipe component is a HDPE heat exchange pipe.

4. The energy tunnel segment with integrated geothermal heat exchange function according to claim 3 is characterized in that: The heat exchange tube components are Φ25mm HDPE heat exchange tubes; the curvature radius of the heat exchange tube components is 150mm, and the spacing between the heat exchange tube components is 80±5mm.

5. The energy tunnel segment with integrated geothermal heat exchange function according to claim 1 is characterized in that: The first connecting piece is a stepped structure embedded in one connecting end of the tube body. The interior of the first connecting piece is hollow and communicates with the end of the heat exchange tube component. The second connecting piece is a box-shaped structure embedded in the other connecting end of the tube body. The interior of the second connecting piece is communicated with the end of the heat exchange tube component. The interior of the second connecting piece has an inverted trapezoidal cavity that matches the first connecting piece.

6. The energy tunnel segment with integrated geothermal heat exchange function according to claim 5 is characterized in that: The side length of the upper bottom surface of the first connecting member is 30 mm, the side length of the lower bottom surface of the first connecting member is 50 mm, and the height of the first connecting member is 40 mm; the end of the second connecting member protrudes 5 mm from the end of the pipe segment body.

7. The energy tunnel segment with integrated geothermal heat exchange function according to claim 5 is characterized in that: A sealing ring matching the first connecting member is embedded in the second connecting member.

8. The energy tunnel segment with integrated geothermal heat exchange function according to claim 5 is characterized in that: A resistance wire is provided inside the second connecting member, and the resistance wire is used to electrically fuse the first connecting member and the second connecting member together after being energized.

9. A method for manufacturing energy tunnel segments with integrated geothermal heat exchange function, characterized in that: The following steps are involved: Determine the optimal curvature radius of heat exchange tube components; Fabrication and installation of segment reinforcement skeleton; Lay the heat exchange pipe components in an "S" shape in the steel frame and tie them up; Install the first connector and the second connector at the corresponding positions of the two connecting ends of the tube body, and connect the first connector and the second connector to the two ends of the heat exchange tube component; Concrete pouring, curing, demoulding and post-curing.

10. A method for assembling energy tunnel segments with integrated geothermal heat exchange function, characterized in that: The following steps are involved: Position the ring blocks, number the segments according to the installation sequence, hoist the segments in the order of numbering, and assemble them with staggered seams; Segment splicing: the hydraulic jack pushes the segment to the predetermined position, and the first connector and the second connector are self-guided and engaged; Connector welding, welding the first connector and the second connector together by electrofusion welding; Sealing verification: inject 0.8MPa pressure water into the heat exchange tube component, maintain the pressure for 15 minutes, and measure the pressure drop ≤ 0.02MPa to determine the quality; The energy tunnel system is in operation, injecting heat exchange medium into the heat exchange tube components and connecting them to heat pumps. The heat pumps improve the geothermal quality, extracting heat from the rock and soil in winter to heat the subway station, and discharging waste heat into the rock and soil in summer.

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