Construction method of constant-temperature temperature-increasing element for ecological dredged sediment temperature-pressure coupling heat phase change

Abstract

The application discloses a construction method of an ecological dredged sediment temperature-pressure coupling heat phase change constant-temperature temperature increasing element, and belongs to the technical field of soft foundation treatment and environment-friendly dredging geotechnical engineering, and comprises the following steps: S1, embedding the temperature increasing element: placing the temperature increasing element in the form of being perpendicular to a construction operation surface at the bottom or middle part of a phase change type vacuum preloading drainage board of the ecological dredged sediment, embedding the temperature increasing element in a grid shape, and spacing each temperature increasing element by 1-2 meters; S2, releasing a heating body and connecting a circuit; S3, reducing the water content of the dredged sediment under the temperature-pressure coupling effect; and S4, constant-temperature control of the heating body. The application can realize constant temperature or controllable temperature, improve the activity of water molecules, rapidly flow to a low-temperature area, and improve the consolidation rate.

Description

Technical Field

[0001] This invention belongs to the field of environmentally friendly dredging technology for soft soil foundation treatment, and particularly relates to a construction method for an ecological dredging sediment temperature-pressure coupled thermal phase change constant temperature heating element. Background Technology

[0002] In the fields of geotechnical and environmental engineering, large-area soft soil foundation reinforcement and in-situ environmental remediation projects often encounter problems such as tight schedules and limited construction technology. To address this, existing construction techniques often employ phase-change vacuum preloading with added heating technology. However, these techniques generally suffer from high energy consumption, high costs, insignificant heating effects, and difficulty in controlling the heating temperature. Therefore, when it is necessary to shorten the construction period and significantly reduce construction costs, the aforementioned conventional construction techniques face numerous insurmountable technical challenges when using phase-change vacuum preloading technology.

[0003] Chinese Patent Publication No. CN107190729A discloses a foundation evaporator and a construction method for using this device to treat soft soil foundations through combined heating and vacuum preloading. Vertical plastic drainage boards are installed in the foundation, with their ends connected to horizontally arranged filter pipes. The outlets of all the filter pipes are connected to the inlet of a pressure-guiding and diversion device. An evaporator is also installed in the foundation, and a sand cushion layer is laid on top. The filter pipes are buried in this sand cushion layer, and an insulation layer is laid on top of the sand cushion layer, followed by a sealing membrane, forming a closed vacuum preloading system. During operation, the pressure-guiding and diversion device is first activated for conventional vacuum preloading foundation reinforcement. When the conventional drainage and consolidation reaches its later stages, a temperature-controlled heating element is activated to heat the foundation, while simultaneously vacuuming the foundation. By controlling the foundation heating temperature and absolute pressure, the moisture in the foundation changes from a liquid to a gaseous state, thereby further reducing the foundation's moisture content and enhancing its strength. This technical solution also uses vacuum preloading and a foundation heating device for heating, but the structure of the heating device cannot achieve constant temperature heating, and it is just simple electric heating with low heating efficiency. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a construction method for an ecological dredging sediment temperature-pressure coupled thermal phase change constant temperature heating element. This method improves the activity of water molecules, enabling them to flow rapidly to the low-temperature region and increasing the consolidation rate, thereby providing constant temperature heating assurance for the temperature-pressure coupled intense thermal phase change vacuum preloading technology used in soft soil treatment.

[0005] The application is implemented by a construction method of an ecological dredged sediment temperature-pressure coupling thermal phase change constant temperature heating element, comprising the following steps: S1, embedding the heating element: placing the heating element in the form of being perpendicular to the construction operation surface at the bottom or middle part of the phase change type vacuum preloading drainage board of the ecological dredged sediment, and embedding in a grid shape, with a spacing of 1-2 meters between each heating element;

[0006] The heating element comprises a heating body, which is a hollow columnar structure, and the heating body is made of light and thin stainless steel material, which ensures the rigidity of the heating body and plays a role of heat conduction, a heater is arranged in the interlayer of the heating body, the heater is connected with an external power supply through wires, so that the inner cavity of the heating body forms a heating cavity, water-permeable and air-permeable stone materials for connecting the heating cavity with the outside are arranged at the upper and lower ends of the heating body, the water-permeable and air-permeable stone materials are ring columnar structures with a length of 10 cm, a supporting rod is arranged in the inner cavity of the heating body, the upper and lower ends of the supporting rod extend into the water-permeable and air-permeable stone materials, and a press-in portion is arranged at the lower end of the supporting rod and penetrates through the water-permeable and air-permeable stone materials, and the press-in portion is threadedly connected with the lower end of the supporting rod.

[0007] S2, releasing the heating body and connecting the circuit;

[0008] S3, reducing the water content of the dredged sediment under the action of temperature-pressure coupling: when the conventional vacuum preloading drainage consolidation is carried out to the later stage, the heating body is powered on to heat the dredged sediment, and vacuum drainage is continued at the same time, by controlling the temperature of the heating body and the vacuum negative pressure of the dredged sediment, the water molecules in the dredged sediment are quickly converted from liquid state to gaseous state, and are discharged through the drainage board, so as to further reduce the water content of the dredged sediment;

[0009] S4, constant temperature control of the heating body.

[0010] Further, a temperature control sensor is arranged on the upper end face of the water-permeable and air-permeable stone material at the lower end of the heating body and in the heating cavity, a temperature control relay is arranged on the circuit switch of the external power supply, and the temperature control sensor and the temperature control relay are electrically connected. The temperature control sensor displays the real-time temperature of the heating cavity on the temperature control relay, and according to the temperature displayed by the temperature control relay, the circuit switch of the external power supply connected with the temperature control relay is adjusted, so as to control the power-on time of the heating body and achieve the purpose of constant temperature control. The step S4 is specifically that the real-time temperature reflected by the temperature control sensor in the heating body is compared with the gasification temperature range, the power switch of the external power supply of the heater is controlled through the temperature control relay, and constant temperature control is realized in a continuous cycle.

[0011] Further, the upper end of the support rod is provided with a connecting section through the water-permeable and air-permeable stone, the connecting section is connected with the upper end of the support rod by screw thread, a release rod is arranged in the connecting section, and the end of the release rod is connected with the connecting section by a quick connector. The quick connector is arranged to quickly release the release rod from the connecting section, the heating body is pressed to the designed position by external force, the heating body can be quickly released by the quick connector, the release rod can be pulled out and recovered after the heating body is released, and reuse is realized.

[0012] Further, the quick connector comprises a clamping piece, a clamping hole is arranged on the connecting section at the position of the clamping piece, the end of the release rod arranged in the connecting section is provided with a mounting groove, a fixed pulley is arranged in the mounting groove, the clamping piece is slidingly arranged in the mounting groove, one end of the clamping piece extends to the clamping hole and penetrates the clamping hole, the other end of the clamping piece is provided with a connecting cable, a limiting plate is arranged in the mounting groove between the clamping piece and the fixed pulley, one end of the connecting cable penetrates the limiting plate and passes around the fixed pulley to be connected with an external pull ring, and a reset spring is sleeved on the connecting cable between the limiting plate and the clamping piece. The clamping hole and the clamping piece can ensure the reliability of the connection between the release rod and the connecting section, the connecting cable and the external pull ring meet the demand of external operation, and the reset spring ensures that the clamping piece can return to the original position after the release tension is released.

[0013] Further, one end of the release rod away from the quick connector is threadedly connected with an extension rod, a plurality of extension rods are arranged, and the plurality of extension rods can be sequentially spliced. The extension rods that can be sequentially spliced can meet the depth demand of different installation positions.

[0014] Further, one end of the extension rod is provided with an external thread section, the other end is provided with an internal thread section, and the plurality of extension rods are sequentially spliced by cooperation of the external thread section and the internal thread section. The threaded connection mode meets the demand of sequential splicing, is convenient to operate, and can also ensure the rigidity of the overall structure.

[0015] Further, the heater is a graphene flexible electrothermal film, and the recess is arranged at the bottom of the interlayer of the heating body, and the graphene flexible electrothermal film is inserted into the recess and arranged along the sidewall of the interlayer of the heating body. The graphene flexible electrothermal film used as the heater can completely fill the interlayer of the heating body, so that the heating body can heat in a planar manner, the heating and heat conduction efficiency is improved, the heating area is increased, and the heating is uniform.

[0016] Further, the pressing part is a cone, and the cone angle of the cone is less than 60°. It is ensured that the overall structure can be smoothly pressed into the soft soil layer under the action of external force.

[0017] Further, the step S1 is specifically: connecting the end of the release rod with the connecting section through a quick connector, and adding an extension rod at the rear end of the release rod according to the placement position, and placing the heating element at the bottom or middle of the ecological dredged sediment phase-change vacuum preloading drainage board by exerting external force on the extension rod to fine-tune the placement position and angle of the heating element.

[0018] Further, the step S2 is specifically: when the heating body is placed at the designed position, pulling the external pull ring to pull the clamping piece through the connecting cable to be recovered into the installation groove, at this time, the return spring is compressed, and the extension rod is pulled upward to separate the end of the release rod from the connecting section, and the release of the heating body is completed.

[0019] The application has the advantages and technical effects that: due to the above technical scheme, for the current warm and pressure coupling intense heat phase-change vacuum preloading technology in soft foundation treatment, the water molecule activity is improved, and the water molecules flow quickly to the low-temperature area to improve the consolidation rate, thereby providing constant temperature heating guarantee for the warm and pressure coupling intense heat phase-change vacuum preloading technology, and providing a constant temperature heating element with low cost, high efficiency and obvious effect for soft foundation treatment construction; the vaporization of water molecules in the phase-change vacuum preloading process is increased, the processing speed of the phase-change vacuum preloading is accelerated, the effect of dewatering and drying treatment of the dredged fill mud is improved, and strong guarantee is provided for the construction quality of environmental dredging and dewatering and drying treatment of the dredged fill mud; constant temperature or controllable temperature can be realized, the water molecule activity is improved, the water molecules flow quickly to the low-temperature area to improve the consolidation rate.

[0020] The heating element is pressed into the suitable position of the soft foundation by the rigidity and external pressure, the carbon atom groups in the heating body perform Brown motion under the action of the electric field, intense friction and impact between the carbon atoms are generated, the heat energy is transferred to the outside in the form of far infrared radiation, the conversion rate of electric energy to heat energy is as high as 99.15% or more, and the purpose of continuous heating is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the overall structure schematic diagram provided by the embodiment of the application;

[0022] Figure 2 is the connecting section and release rod connecting structure schematic diagram provided by the embodiment of the application;

[0023] Figure 3 is the extension rod structure schematic diagram provided by the embodiment of the application.

[0024] In the diagram: 1. Heating element; 2. Heater; 3. Heating chamber; 4. Permeable and breathable stone; 5. Support rod; 6. Press-in part; 7. Temperature sensor; 8. Temperature relay; 9. Connecting section; 9-1. Engaging hole; 10. Release rod; 10-1. Mounting groove; 11. Quick connector; 11-1. Engaging part; 11-2. Fixed pulley; 11-3. Connecting steel cable; 11-4. Limiting plate; 11-5. External pull ring; 11-6. Return spring; 12. Extension rod; 12-1. External thread section; 12-2. Internal thread section. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] like Figures 1 to 3 As shown, this application provides a construction method for an ecological dredged sediment temperature-pressure coupled thermal phase change constant temperature heating element, comprising the following steps:

[0027] S1. Installing the heating elements: Place the assembled heating elements perpendicular to the working surface at the bottom or middle of the ecological dredged sediment phase change vacuum pre-compression drainage board, using a grid-like installation, with each heating element spaced 1-2 meters apart; specifically, connect the end of the release rod 10 to the connecting section 9 via the quick connector 11, and add an extension rod 12 to the rear end of the release rod 10 according to the placement position. Apply external force to the extension rod 12 to place the constant temperature heating element at the bottom or middle of the ecological dredged sediment phase change vacuum pre-compression drainage board, and finely adjust the placement position and angle of the heating element through the extension rod 12.

[0028] The connection process of the release rod 10 end is as follows: Pull the outer pull ring 11-5, and pull the locking part 11-1 back into the mounting groove 10-1 through the connecting steel cable 11-3. At this time, the return spring 11-6 is compressed, and the end of the release rod 10 with the quick connector 11 is placed in the connecting section 9. Release the outer pull ring 11-5, and the return spring 11-6 rebounds and pushes the locking part 11-1 out of the mounting groove 10-1 and locks in the locking hole 9-1, thereby realizing the connection between the release rod 10 and the connecting section 9.

[0029] The heating element comprises a heating body 1, which is a hollow columnar structure, the heating body 1 is made of light and thin stainless steel material, which can ensure the rigidity of the heating body 1 and play a role of heat conduction, a heater 2 is arranged in the interlayer of the heating body 1, the heater 2 is connected with an external power supply through a wire, so that the inner cavity of the heating body 1 forms a heating cavity 3. Preferably, the heater 2 is a graphene flexible electrothermal film, a groove is arranged at the bottom of the interlayer of the heating body 1, and the graphene flexible electrothermal film is inserted into the groove and arranged along the side wall of the interlayer of the heating body 1. The graphene flexible electrothermal film can completely fill the interlayer of the heating body 1, so that the heating body 1 can heat in a planar manner, the heating and heat conduction efficiency is improved, the heating area is increased, and the heating is uniform. Specifically, the outer diameter of the heating body 1 is 50 mm, the inner diameter is 30 mm, the thickness of the graphene flexible electrothermal film is about 10 mm, the graphene flexible electrothermal film is inserted into the groove at the bottom of the interlayer, and the bottom is welded to form a whole. The upper and lower ends of the heating body 1 are respectively provided with water-permeable and air-permeable stone 4 for connecting the heating cavity 3 with the outside, the water-permeable and air-permeable stone 4 is in a ring columnar structure and has a length of 10 cm, water molecules can enter the inside of the heating body 1 through the lower water-permeable and air-permeable stone 4, when the water molecules exist in the inside of the heating body 1, a certain heat preservation effect is achieved, when the heating body 1 is heated to the vaporization temperature of the water molecules, the water vapor generated in the inside of the heating body 1 can be discharged through the upper water-permeable and air-permeable stone 4. The inner cavity of the heating body 1 is provided with a support rod 5, the upper and lower ends of the support rod 5 respectively extend into the water-permeable and air-permeable stone 4, a pressing portion 6 is arranged at the lower end of the support rod 5 and penetrates through the water-permeable and air-permeable stone 4, and the pressing portion 6 and the lower end of the support rod 5 are connected in a threaded manner. The pressing portion 6 is a cone, and the cone angle of the cone is less than 60°. It is ensured that the overall structure can be smoothly pressed into the soft soil layer under the action of external force.

[0030] A temperature control sensor 7 is arranged on the upper end face of the water-permeable and air-permeable stone 4 below the heating body 1 and in the heating cavity 3, a temperature control relay 8 is arranged on the circuit switch of the external power supply, and the temperature control sensor 7 and the temperature control relay 8 are electrically connected. The temperature control sensor 7 displays the real-time temperature of the heating cavity 3 on the temperature control relay 8, the circuit switch of the external power supply connected with the temperature control relay 8 is adjusted according to the displayed temperature of the temperature control relay 8, so as to control the power-on time of the heating body 1 to achieve the purpose of constant temperature control.

[0031] The upper end of the support rod 5 is provided with a connecting section 9 penetrating the water-permeable and air-permeable stone material 4, the connecting section 9 is threadedly connected with the upper end of the support rod 5, a release rod 10 is arranged in the connecting section 9, and the end of the release rod 10 is connected with the connecting section 9 through a quick connector 11. The quick connector 11 is arranged to quickly release the release rod 10 from the connecting section 9, and after the heating body 1 is pressed to the designed position by external force, the heating body 1 can be quickly released through the quick connector 11, and after the heating body 1 is released, the release rod 10 can be pulled out and recovered to realize repeated use. The quick connector 11 comprises a clamping piece 11-1, the connecting section 9 at the position of the clamping piece 11-1 is provided with a clamping hole 9-1, the end of the release rod 10 arranged in the connecting section 9 is provided with a mounting groove 10-1, a fixed pulley 11-2 is arranged in the mounting groove 10-1, the clamping piece 11-1 is slidingly arranged in the mounting groove 10-1, one end of the clamping piece 11-1 extends to the direction of the clamping hole 9-1 and penetrates the clamping hole 9-1, the other end of the clamping piece 11-1 is provided with a connecting steel cable 11-3, a limiting plate 11-4 is arranged in the mounting groove 10-1 between the clamping piece 11-1 and the fixed pulley 11-2, one end of the connecting steel cable 11-3 penetrates the limiting plate 11-4 and passes around the fixed pulley 11-2 to be connected with an external pull ring 11-5, and a reset spring 11-6 is sleeved on the connecting steel cable 11-3 between the limiting plate 11-4 and the clamping piece 11-1. The clamping hole 9-1 and the clamping piece 11-1 can ensure the reliability of the connection between the release rod 10 and the connecting section 9, the connecting steel cable 11-3 and the external pull ring 11-5 meet the demand of external operation, and the reset spring 11-6 ensures that the clamping piece 11-1 can return to the original position after the release tension is released. When connection is needed, the external pull ring 11-5 is pulled, the clamping piece 11-1 is pulled back to the mounting groove 10-1 through the connecting steel cable 11-3, at this time, the reset spring 11-6 is compressed, the end of the release rod 10 provided with the quick connector 11 is arranged in the connecting section 9, the external pull ring 11-5 is loosened, the reset spring 11-6 rebounds to push the clamping piece 11-1 to extend out of the mounting groove 10-1 and be clamped in the clamping hole 9-1, and the connection between the release rod 10 and the connecting section 9 is realized; when the heating body 1 needs to be released, the external pull ring 11-5 is pulled, the clamping piece 11-1 is pulled back to the mounting groove 10-1 through the connecting steel cable 11-3, at this time, the reset spring 11-6 is compressed, the end of the release rod 10 is separated from the connecting section 9, after the separation, the external pull ring 11-5 is loosened, and the release of the heating body 1 is completed.

[0032] One end of the release lever 10, located away from the quick connector 11, is threadedly connected to an extension rod 12. Multiple extension rods 12 are provided and can be sequentially spliced ​​together. This sequential splicing of extension rods 12 can meet the depth requirements of different installation positions. One end of each extension rod 12 has an external thread section 12-1, and the other end has an internal thread section 12-2. Multiple extension rods 12 are sequentially spliced ​​together through the engagement of the external thread section 12-1 and the internal thread section 12-2. The threaded connection method satisfies the requirement for compliant splicing, facilitates operation, and ensures the rigidity of the overall structure.

[0033] S2. Release heating element 1 and connect the circuit: After the heating element 1 is placed in the designed position, pull the external pull ring 11-5, and pull the locking piece 11-1 back into the mounting groove 10-1 through the connecting steel cable 11-3. At this time, the reset spring 11-6 is compressed, and at the same time, the extension rod 12 is pulled upward to disengage the end of the release rod 10 from the connecting section 9, thus completing the release of the heating element 1; connect the heater 2 wire to the temperature control relay 8, and then connect the temperature control relay 8 to the circuit switch of the external power supply. The temperature control sensor 7 is electrically connected to the temperature control relay 8. After the connection is completed, check the circuit of each heating element one by one to ensure that the circuit is in normal working order.

[0034] S3. Reducing the water content of dredged sediment under temperature and pressure coupling: When the conventional vacuum pre-compression drainage and consolidation is in the later stage, the heating body 1 is energized to heat the dredged sediment, while the vacuum drainage continues. By controlling the temperature of the heating body 1 and the vacuum negative pressure of the dredged sediment, the water molecules in the dredged sediment are rapidly changed from liquid to gaseous and discharged through the drainage plate, further reducing the water content of the dredged sediment.

[0035] The heating process of heating element 1 is as follows: After heating element 1 enters the ecological dredged sediment, water molecules enter the heating chamber 3 inside heating element 1 through the permeable and breathable stone material 4. When the heater 2 in heating element 1 is powered on, it heats the dredged sediment. When the temperature reaches the critical temperature of vaporization, the water in the dredged sediment changes from liquid to gaseous. When the water molecules in heating chamber 3 reach the critical temperature, they vaporize simultaneously and are discharged from heating chamber 3 through the permeable and breathable stone material 4 above.

[0036] Based on extensive experimental data, the following table shows the relationship between pressure and temperature when water in dredged sediment changes from a liquid to a gaseous state under negative pressure:

[0037] Serial number Negative pressure (kPa) Temperature (°C) 1 53.930 80 2 70.213 70 3 81.438 60 4 85.624 55 5 89.093 50

[0038] That is, when the dredged sediment negative pressure is 53.930 kPa and the temperature is greater than 80℃, the water in the dredged sediment changes from liquid to gas; when the dredged sediment negative pressure is 70.213 kPa and the temperature is greater than 70℃, the water in the dredged sediment changes from liquid to gas; when the dredged sediment negative pressure is 81.438 kPa and the temperature is greater than 60℃, the water in the dredged sediment changes from liquid to gas; when the dredged sediment negative pressure is 85.624 kPa and the temperature is greater than 55℃, the water in the dredged sediment changes from liquid to gas; and when the dredged sediment negative pressure is 89.093 kPa and the temperature is greater than 50℃, the water in the dredged sediment changes from liquid to gas.

[0039] S4, constant temperature control of the heating body 1: the real-time temperature reflected by the temperature control inductor 7 inside the heating body 1 is compared with the gasification temperature range, and the power switch of the external power supply of the heater 2 is controlled by the temperature control relay 8 to realize the constant temperature control in continuous circulation.

[0040] Taking the negative pressure of 81.438 as an example, the temperature interval of the temperature control relay 8 is set to 60℃≤T<70℃, and the real-time temperature reflected by the temperature control inductor 7 arranged inside the heating body 1 is taken as the standard. When the real-time temperature of the temperature control inductor 7 is less than 60℃, the temperature control relay 8 starts the power switch of the external power supply, and the heating body 1 starts heating, so that the water in the dredged sediment changes from liquid to gas. When the real-time temperature of the temperature control inductor 7 is greater than or equal to 70℃, the temperature control relay 8 closes the power switch of the external power supply, and the heating body 1 stops heating. Under the heat preservation effect of the water in the heating body 1, the temperature slowly decreases, the water in the dredged sediment continues to vaporize, and the whole link continuously circulates to finally achieve the constant temperature effect.

[0041] Due to the above technical scheme, for the current soft foundation treatment, the water molecule activity is improved, and the water molecules quickly flow to the low temperature area to improve the consolidation rate, thereby providing constant temperature type temperature increasing guarantee for the temperature and pressure coupling intense heat phase change type vacuum preloading technology, and providing a constant temperature increasing element with low cost, high efficiency and obvious effect for the soft foundation treatment construction; the water molecule vaporization in the phase change type vacuum preloading process is increased, the phase change type vacuum preloading treatment speed is accelerated, the effect of the dredged material dewatering and drying treatment of the filling pool is improved, and a powerful guarantee is provided for the environmental dredging and the construction quality of the dredged material dewatering and drying treatment of the filling pool; the constant temperature or controllable temperature can be realized, the water molecule activity is improved, the water molecules quickly flow to the low temperature area, and the consolidation rate is improved.

[0042] The temperature increasing element is pressed into the soft foundation at a suitable position by relying on the rigidity and external pressure, the carbon atom groups in the heating body perform "Brown motion" under the action of the electric field by relying on the flexible electric heating film of graphene, the carbon atoms between the carbon atom groups produce intense friction and impact, the heat energy generated is transferred to the outside in the form of far infrared radiation, the conversion rate of electric energy to heat energy is as high as 99.15% or more, and the purpose of continuous heating is achieved.

[0043] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A construction method of an ecological dredged sediment temperature-pressure coupling thermal phase change constant temperature warming element, characterized in that, It comprises the following steps: S1, embedding the heating element: placing the heating element at the bottom or middle of the ecological dredged sediment phase-change vacuum preloading drainage board in the form of being perpendicular to the construction operation surface, adopting grid embedding, and the distance between each heating element is 1-2 meters; The heating element comprises a heating body (1), the heating body (1) is a hollow columnar structure, a heater (2) is arranged in the interlayer of the heating body (1), the heater (2) is connected with an external power supply through a wire, so that the inner cavity of the heating body (1) forms a heating cavity (3), the upper and lower ends of the heating body (1) are respectively provided with water-permeable and air-permeable stone materials (4) for connecting the heating cavity (3) with the outside, the inner cavity of the heating body (1) is provided with a support rod (5), the upper and lower ends of the support rod (5) respectively extend into the water-permeable and air-permeable stone materials (4), and a pressing portion (6) is arranged at the lower end of the support rod and penetrates through the water-permeable and air-permeable stone materials (4); The upper end of the support rod (5) is provided with a connecting section (9) penetrating through the water-permeable and air-permeable stone materials (4), a release rod (10) is arranged in the connecting section (9), and the end of the release rod (10) is connected with the connecting section (9) through a quick connector (11); the end of the release rod (10) is connected with the connecting section (9) through the quick connector (11), a lengthening rod (12) is additionally arranged at the rear end of the release rod (10) according to the placement position, the heating element is placed at the bottom or middle of the ecological dredged sediment phase-change vacuum preloading drainage board by applying external force to the lengthening rod (12), and the placement position and angle of the heating body are finely adjusted through the lengthening rod (12); S2, releasing the heating body (1) and connecting the circuit; when the heating body (1) is placed at the designed position, the external pull ring (11-5) is pulled, the clamping piece (11-1) is pulled through the connecting steel cable (11-3) and is recovered into the mounting groove (10-1), at this time, the reset spring (11-6) is compressed, the lengthening rod (12) is pulled upward, the end of the release rod (10) is separated from the connecting section (9), and the release of the heating body (1) is completed; S3, reducing the water content of the dredged sediment under the action of temperature and pressure coupling: when the conventional vacuum preloading drainage consolidation is carried out to the later stage, the heating body (1) is electrified to heat the dredged sediment, and vacuum drainage is continuously carried out, the water molecules in the dredged sediment are quickly converted from liquid state to gaseous state by controlling the temperature of the heating body and the vacuum negative pressure of the dredged sediment, and are discharged through the drainage board, so that the water content of the dredged sediment is further reduced; after the heating body (1) enters the ecological dredged sediment, the water molecules enter the heating cavity (3) in the heating body (1) through the water-permeable and air-permeable stone materials (4); when the heater (2) in the heating body (1) is electrified to heat the dredged sediment, the water in the dredged sediment is converted from liquid state to gaseous state as the temperature rises, and the water molecules in the heating cavity (3) reach the critical temperature and are gasified at the same time, and are discharged from the heating cavity (3) through the water-permeable and air-permeable stone materials (4) at the upper part; S4, constant temperature control of the heating body, when the real-time temperature is greater than the temperature control interval, the heating body stops heating, under the heat preservation effect of the water in the heating body, the temperature slowly decreases, the water in the dredged sediment continuously vaporizes, and the whole link continuously circulates to finally achieve the constant temperature effect.

2. The construction method according to claim 1, characterized in that, A temperature control sensor (7) is arranged on the upper end face of the water-permeable and air-permeable stone material (4) which is attached to the lower end of the heating body (1) and is located in the heating cavity (3), and a temperature control relay (8) is arranged on the circuit switch of the external power supply, and the temperature control sensor (7) and the temperature control relay (8) are electrically connected. The step S4 is specifically that: the real-time temperature reflected by the temperature control sensor (7) in the heating body (1) is compared with the vaporization temperature range, the power switch of the external power supply of the heater (2) is controlled through the temperature control relay (8), and constant temperature control in continuous circulation is realized.

3. The construction method according to claim 1, characterized in that, The quick connector (11) comprises a clamping piece (11-1), a clamping hole (9-1) is arranged on a connecting section (9) located relative to the position of the clamping piece (11-1), an installation groove (10-1) is arranged at the end of a release lever (10) located in the connecting section (9), a fixed pulley (11-2) is arranged in the installation groove (10-1), the clamping piece (11-1) is slidingly arranged in the installation groove (10-1), one end of the clamping piece (11-1) extends to the direction of the clamping hole (9-1) and penetrates through the clamping hole (9-1), the other end of the clamping piece (11-1) is provided with a connecting steel cable (11-3), a limiting plate (11-4) is arranged in the installation groove (10-1) between the clamping piece (11-1) and the fixed pulley (11-2), one end of the connecting steel cable (11-3) penetrates through the limiting plate (11-4) and passes around the fixed pulley (11-2) to be connected with an external pull ring (11-5), and a return spring (11-6) is sleeved on the connecting steel cable (11-3) between the limiting plate (11-4) and the clamping piece (11-1).

4. The construction method according to claim 1, characterized in that, One end of the release lever (10) away from the quick connector (11) is threadedly connected with an extension rod (12), and a plurality of extension rods (12) are arranged.

5. The construction method according to claim 4, characterized in that, One end of the extension rod (12) is provided with an external thread section (12-1), and the other end is provided with an internal thread section (12-2), and the external thread section (12-1) and the internal thread section (12-2) are matched to realize the sequential splicing of the plurality of extension rods (12).

6. The construction method according to claim 1, characterized in that, The heater (2) is a graphene flexible electric heating film, a recess is arranged at the bottom of the interlayer of the heating body (1), and the graphene flexible electric heating film is inserted into the recess and arranged along the side wall of the interlayer of the heating body (1).

7. The construction method according to claim 1, characterized in that, The pressing part (6) is a circular cone, and the cone angle of the circular cone is less than 60°.

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