Large-volume raft foundation concrete curing structure

Abstract

The utility model provides a large-volume raft foundation concrete curing structure which comprises a raft, a formwork surrounding the raft is installed outside the raft, the top of the formwork is higher than the top face of the raft to form a heat preservation layer, and a coiled cooling water pipe is arranged on a reinforcing mesh in the raft. The water inlet end and the water outlet end of the cooling water pipe penetrate through the formwork to extend out of the formwork, the water inlet end is communicated with a circulating system, and the water outlet end penetrates in and out of the formwork higher than the top face of the raft plate. Cooling water with proper temperature can circulate in the cooling water pipe through the circulating system, so that heat in the raft is absorbed and flows back to the circulating system to circulate after passing through the heat preservation layer, the heat is utilized to guarantee the stability of the surface temperature of the raft while the heat in the raft is dissipated, and the situation that the temperature difference between the inside and the outside is large and the service life of the raft is prolonged is effectively avoided. And meanwhile, heat in the raft is utilized, so that the heat utilization rate is improved, and the effects of low carbon, energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] The utility model relates to the field of raft curing, in particular to a curing structure for mass raft foundation concrete. Background Art

[0002] Mass concrete projects face a series of special challenges and technical requirements due to their large structural thickness and huge volume. In addition to meeting the strength requirements specified in the design, controlling the hydration heat of concrete, preventing various types of cracks, and ensuring that the structure has good impermeability and shrinkage-free properties are the key points and difficulties during the construction process.

[0003] A large amount of heat is released during the hydration process of concrete, which is particularly obvious in mass concrete. After pouring, the internal temperature rises while the surface easily dissipates heat, resulting in a temperature difference between the inside and outside. This temperature difference causes compressive stress inside and tensile stress on the surface. The early tensile strength of newly poured concrete is relatively low. When the surface tensile stress exceeds its ultimate tensile strength, cracks will occur on the concrete surface. These cracks may further develop into through-cracks under the change of external air temperature, leading to concrete cracking, causing water leakage problems in the floor slab, and possibly causing structural damage to the foundation slab and leaving potential safety hazards. Therefore, a curing structure for mass raft foundation concrete is proposed to solve the above problems. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a curing structure for mass raft foundation concrete to solve the problem of large temperature difference between the inside and outside of the mass raft foundation concrete.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is: a curing structure for mass raft foundation concrete, including a raft. A formwork surrounding the raft is installed outside the raft. The top height of the formwork is higher than the top surface of the raft, forming a heat preservation layer. Coiled cooling water pipes are arranged on the steel mesh in the raft. Both the inlet and outlet ends of the cooling water pipes pass through the formwork and extend to the outside. Among them, the inlet end is connected to a circulation system, and the outlet end passes through and out of the formwork higher than the top surface of the raft, passes through the heat preservation layer, and is connected to the circulation system to form a circulating cooling loop. A heat preservation cover for closing the top of the heat preservation layer is provided on the top of the formwork.

[0006] In a preferred solution, temperature sensors are evenly arranged in both the raft and the heat preservation layer.

[0007] In a preferred solution, a drain valve is provided on the cooling water pipe in the heat preservation layer to discharge the circulating water in the cooling water pipe into the heat preservation layer. A recovery system with one end connected to the heat preservation layer and the other end connected to the circulation system is also provided on the side of the formwork.

[0008] In a preferred embodiment, the cooling water pipe includes a water inlet pipe that penetrates through the formwork and is inserted into the raft foundation slab. The inserted end of the water inlet pipe is connected to two cooling pipes through a first three-way joint. Both cooling pipes are coiled and arranged on the steel bar mesh, and the water outlet ends are both connected to two branch pipes through a second three-way joint. The branch pipes pass through the formwork and penetrate into the insulation layer, and a drain valve is provided on the pipe section located in the insulation layer. The ends of the four branch pipes are connected to a central pipe, and the middle of the central pipe is connected to a circulation pipe that penetrates through the formwork and is connected to the circulation system.

[0009] In a preferred embodiment, the circulation system includes a sump, a heater, and a circulation water pump that are connected in sequence through pipes. The output end of the circulation water pump is connected to the water inlet pipe, and the circulation pipe is connected to the sump.

[0010] In a preferred embodiment, the recovery system includes a drain pipe that penetrates through the formwork and is connected to the insulation layer. The other end of the drain pipe is connected to the water inlet end of a filter, and the water outlet end of the filter is connected to the heater through a recovery pipe.

[0011] The present utility model provides a large-volume raft foundation concrete curing structure. The temperature-appropriate cooling water can circulate in the cooling water pipe through the circulation system, thereby absorbing the heat inside the raft foundation slab, flowing back to the circulation system for circulation after passing through the insulation layer, and then realizing the simultaneous dissipation of heat inside the raft foundation slab and ensuring the stability of the surface temperature of the raft foundation slab by using this heat. It effectively avoids a large temperature difference between the inside and outside, and at the same time reuses the heat inside the raft foundation slab, improves the heat utilization rate, and achieves the effect of low-carbon energy conservation and environmental protection. At the same time, through the heat preservation cover provided on the top of the insulation layer, the insulation layer can form a relatively sealed environment, avoiding a rapid change in the surface temperature of the raft foundation slab and resulting in a large temperature difference between the inside and outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0013] Figure 1 is a half-sectional view of the raft foundation slab of the present utility model;

[0014] Figure 2 is a top view of the raft foundation slab of the present utility model;

[0015] Figure 3 is a connection structure diagram of the heat preservation cover and the raft foundation slab of the present utility model;

[0016] Figure 4 is a connection structure diagram of the formwork and the raft foundation slab of the present utility model;

[0017] Figure 5 is a connection structure diagram of the heat preservation cover and the automatic retracting and extending mechanism of the present utility model;

[0018] Figure 6 is a structure diagram of the automatic retracting and extending mechanism of the present utility model;

[0019] Figure 7 is the enlarged view of Structure A in the present utility model; Figure 6 in the present utility model;

[0020] Figure 8 is another perspective structure diagram of the present utility model; Figure 6 in the present utility model;

[0021] Figure 9 is the structure diagram of the support mechanism of the present utility model;

[0022] Figure 10 is the exploded structure diagram of the clamping mechanism of the present utility model;

[0023] Figure 11 is the top view structure diagram of the lifting ring of the present utility model;

[0024] In the figure: raft plate 1; cooling water pipe 2; water inlet pipe 201; first three-way joint 202; cooling pipe 203; second three-way joint 204; branch pipe 205; drain valve 206; central pipe 207; circulation pipe 208; drain pipe 209; filter 210; circulation system 3; sump 301; heater 302; circulation water pump 303; formwork 4; hook plate 401; heat preservation cover 5; hook strip 501; track assembly 6; rack 601; T-shaped slide rail 602; automatic retracting and releasing mechanism 7; moving mechanism 71; moving seat 710; sliding seat 711; transmission shaft 712; traveling gear 713; support plate 714; driving device 715; driving sprocket 716; driven sprocket 717; chain 718; winding shaft 72; flattening assembly 73; mounting seat 730; flattening roller 731; winding and compacting assembly 74; rotary bearing 740; rotating part 741; compacting roller 742; support mechanism 8; telescopic rod 81; lifting cylinder 82; diagonal brace 83; universal joint 84; clamping mechanism 85; vertical rod 850; lifting groove 8500; connecting seat 851; clamping assembly 852; clamp 8520; connecting shaft 8521; transmission rod 8522; control seat 8523; control assembly 853; lifting ring 8530; limiting block 8531; extension plate 8532; internal thread sleeve 8533; connecting ring 8534; connecting ring 8535. Detailed implementation manners

[0025] Embodiment 1

[0026] As Figures 1-4As shown in the figure, a large-volume raft foundation concrete curing structure includes a raft 1. A formwork 4 surrounding the raft 1 is installed outside the raft 1. The top height of the formwork 4 is higher than the top surface of the raft 1, forming a heat-insulating layer. Coiled cooling water pipes 2 are arranged on the steel mesh inside the raft 1. Both the inlet and outlet ends of the cooling water pipes 2 pass through the formwork 4 and extend to the outside. The inlet end is connected to a circulation system 3, and the outlet end passes through and out of the formwork 4 higher than the top surface of the raft 1. After passing through the heat-insulating layer, it is connected to the circulation system 3 to form a circulating cooling loop. A heat-insulating cover 5 that closes the top of the heat-insulating layer is provided on the top of the formwork 4.

[0027] During curing, cooling water at an appropriate temperature can be circulated in the cooling water pipes 2 through the circulation system 3, thereby absorbing the heat inside the raft 1 and flowing back to the circulation system 3 for circulation after passing through the heat-insulating layer. Furthermore, while dissipating the heat inside the raft 1, the heat is used to ensure the stability of the surface temperature of the raft 1, effectively avoiding a large temperature difference between the inside and the outside. At the same time, the heat inside the raft 1 is reused, improving the heat utilization rate and achieving the effect of low-carbon energy conservation and environmental protection. At the same time, through the heat-insulating cover 5 provided on the top of the heat-insulating layer, the heat-insulating layer can form a relatively sealed environment, avoiding the rapid change of the surface temperature of the raft 1.

[0028] In a preferred embodiment, temperature sensors are evenly arranged in both the raft 1 and the heat-insulating layer for real-time monitoring of the temperature inside and on the surface of the raft 1.

[0029] It should be noted that the temperature sensors inside the raft 1 need to be buried in it before pouring. The temperature sensors are all commercially available products, so they will not be described in detail here.

[0030] In a preferred embodiment, a drain valve 206 is installed on the cooling water pipes 2 located in the heat-insulating layer. Thus, when the surface temperature of the raft 1 drops significantly, the circulating water that has absorbed heat in the cooling water pipes 2 can be discharged into the heat-insulating layer to stabilize the temperature through direct contact with the surface. A recovery system with one end connected to the heat-insulating layer and the other end connected to the circulation system 3 is also provided on the side of the formwork 4. Thus, the water in the heat-insulating layer can be recycled again through the recovery system. At the same time, through the heat-insulating cover 5, the water in the heat-insulating layer can be effectively prevented from being affected by the external environment, and dust and impurities are prevented from entering, affecting the circulation system.

[0031] In the preferred embodiment, the cooling water pipe 2 includes a water inlet pipe 201 that penetrates through the formwork 4 and inserts into the raft foundation 1. The inserted end of the water inlet pipe 201 is connected to two cooling pipes 203 through a first three-way joint 202. The two cooling pipes 203 are both coiled and arranged on the steel bar mesh, and the water outlet ends are both connected to two branch pipes 205 through a second three-way joint 204. The branch pipes 205 penetrate out of the formwork 4 and penetrate into the insulation layer. A drain valve 206 is provided on the pipe section located in the insulation layer. The ends of the four branch pipes 205 are connected to a collecting pipe 207, and the middle of the collecting pipe 207 is connected to a circulating pipe 208 that penetrates through the formwork 4 and is connected to the circulating system 3.

[0032] Through the above multi-pipeline cooling water pipe 2 system, the efficiency of discharging the circulating water into the insulation layer can be effectively improved, and at the same time, the heat dissipation efficiency inside the raft foundation 1 can be effectively improved.

[0033] The circulating system 3 includes a sump 301, a heater 302, and a circulating water pump 303 that are sequentially connected through pipes. Among them, the output end of the circulating water pump 303 is connected to the water inlet pipe 201, and the circulating pipe 208 is connected to the sump 301, thereby forming an effective circulating system.

[0034] The recovery system includes a drain pipe 209 that penetrates through the formwork 4 and is connected to the insulation layer. The other end of the drain pipe 209 is connected to the water inlet end of a filter 210. The water outlet end of the filter 210 is connected to the heater 302 through a recovery pipe 211. The drain pipe 209 is located at the bottom of the insulation layer, which is convenient for pumping out the water from it and filtering it through the filter 210 and then entering the heater 302 for circulation.

[0035] It should be noted that the filter 210 is a commercially available product, so it will not be described in detail here.

[0036] In the preferred embodiment, the insulation cover 5 is a mineral wool quilt, and its covering thickness is obtained by the following formula:

[0037]

[0038] In the formula: δ—the thickness of the insulation layer on the concrete surface (m);

[0039] λ0—the thermal conductivity of the concrete [W / (m·k)];

[0040] λi—the thermal conductivity of the insulation material [W / (m·k)];

[0041] Ts—the surface temperature of the concrete casting body (℃);

[0042] Tq—the average atmospheric temperature (℃) when the concrete reaches the highest temperature (3d - 5d after pouring);

[0043] average temperature (℃);

[0044] Tmax—the maximum temperature in the concrete casting body (℃);

[0045] h—actual thickness of concrete structure (m);

[0046] Kb—heat transfer coefficient correction value.

[0047] Example 2

[0048] Further illustrate with reference to Example 1, Figures 3-8 In the structure shown, the template 4 is a steel template, and track assemblies 6 are provided on the tops of the two opposite templates 4. Automatic retracting mechanisms 7 for retracting and extending the insulation cover 5 are mounted on the two track assemblies 6. The automatic retracting and extending mechanism 7 can realize automatic retraction and extension of the insulation cover 5, so that it can be automatically retracted when the surface temperature is too high.

[0049] The automatic retracting and releasing mechanism 7 includes two moving mechanisms 71 movably arranged on the track components 6 respectively, and a reel 72 drivingly connected to the two moving mechanisms 71 . The reel 72 can retract and release the insulation cover 5 as the two moving mechanisms 71 move on the two track components 6 .

[0050] A hook plate 401 is fixedly provided on the outer side of the top of the template 4 located at the end.

[0051] One end of the heat-insulating cover 5 is fixed on the winding shaft 72 , and the other end is connected with a hooking strip 501 that can be hooked with the hooking plate 401 .

[0052] With such a design, the movement of the heat preservation cover 5 can be hooked on the hook plate 401 through the hook strip 501, and then the heat preservation cover 5 can be retracted and released by the automatic retracting and releasing mechanism 7 walking on the track assembly 6, and at the same time, the steel formwork can meet the strength requirements of the automatic retracting and releasing mechanism 7 walking on it.

[0053] In a preferred embodiment, the track assembly 6 includes a T-shaped slide rail 602 and a rack 601 which are arranged in parallel, and both the T-shaped slide rail 602 and the rack 601 are fixedly mounted on the template 4 .

[0054] The moving mechanism 71 includes a moving seat 710, and the moving seat 710 is fixedly provided with a sliding seat 711 that is slidably connected to the T-shaped slide rail 602, and a transmission shaft 712 is rotatably penetrated through the middle through a bearing, and a traveling gear 713 meshing with the rack 601 is fixedly installed on the outside of the transmission shaft 712, and the two ends of the winding shaft 72 are respectively connected to the ends of the transmission shaft 712 of the two moving mechanisms 71.

[0055] A driving mechanism is fixed on one of the moving mechanisms 71. The driving mechanism includes a support plate 714 fixed to the top end of the moving seat 710. A driving device 715 is installed on the support plate 714. A driving sprocket 716 is installed at the output end of the driving device 715. A driven sprocket 717 corresponding to the driving sprocket 716 is provided at the end of the transmission shaft 712. A chain 718 is sleeved outside the driving sprocket 716 and the driven sprocket 717.

[0056] During use, through the drive of the driving mechanism and the transmission relationship among the driving sprocket 716, the driven sprocket 717 and the chain 718, the transmission shaft 712 drives the traveling gear 713 to travel on the rack 601. At the same time, during the traveling process, the transmission shaft 712 will also rotate synchronously, so as to realize the retraction and extension of the heat preservation cover 5.

[0057] It should be noted that the driving device 715 is composed of a driving motor and a speed reducer.

[0058] In a preferred solution, the automatic retracting and extending mechanism 7 further includes a flattening component 73 arranged between the two moving mechanisms 71. The flattening component 73 includes a mounting seat 730 fixed to the opposite ends of the two moving seats 710, and a flattening roller 731 arranged between the two mounting seats 730. The bottom of the flattening roller 731 is flush with the top end of the template 4. Thus, when the heat preservation cover 5 is unfolded, as Figure 3 and 5 shown, through the flattening roller 731, the unfolded heat preservation cover 5 can be formed into a plane, improving the sealing effect on the heat preservation layer. In this embodiment, the flattening roller 731 is rotatably arranged between the two mounting seats 730, and the rotation of the flattening roller 731 can effectively reduce friction.

[0059] The automatic retracting and extending mechanism 7 further includes a winding and compacting component 74 arranged between the two moving mechanisms 71 and attached to the heat preservation cover 5 on the winding shaft 72. The winding and compacting component 74 includes rotary bearings 740 respectively installed on the opposite sides of the two moving seats 710. A rotating member 741 is rotatably connected to the rotary bearings 740 through a rotating shaft. A compacting roller 742 is rotatably arranged between the two rotating members 741. A return torsion spring for maintaining the fitting relationship between the compacting roller 742 and the heat preservation cover 5 is sleeved on the rotating shaft. The return torsion spring is not described in detail in the figure, and its specific installation method is the common installation method of the return torsion spring. Thus, through the fitting relationship between the compacting roller 742 and the heat preservation cover 5, the heat preservation cover 5 can be compacted when it is wound, avoiding the situation of unsmooth winding.

[0060] Embodiment 3

[0061] As further illustrated in Embodiment 1, currently, the cooling water pipe 2 is mainly tied to the vertical steel bars of the steel bar mesh with iron wire so that it can be located in the middle of multiple layers of steel bar meshes. However, during the concrete pouring, there is a downward drop in the vertical direction, resulting in unnecessary displacement. To improve the installation stability of the cooling water pipe 2, as Figures 9-11 shown in the structure, the cooling water pipe 2 is also fixed to the steel bar mesh below it inside the raft slab 1 through a support mechanism 8.

[0062] In a preferred solution, the support mechanism 8 includes a telescopic rod 81, and the telescopic rod 81 can adjust its support height to meet the spacing requirements between the cooling water pipe 2 and the steel bar mesh below it. A lifting cylinder 82 is slidably sleeved outside the telescopic rod 81, and a diagonal support rod 83 is hinged outside the lifting cylinder 82. The diagonal support rod 83 realizes the effect of adjusting its support height through the up and down sliding of the lifting cylinder 82 outside the telescopic rod 81. The bottom of the diagonal support rod 83 and both ends of the telescopic rod 81 are connected with a clamping mechanism 85 through a universal joint 84, so as to facilitate the clamping mechanism 85 to adjust the clamping angle and direction through the universal joint 84. A locking bolt is threadedly penetrated through the upper part of the lifting cylinder 82 for fixing the height position of the lifting cylinder 82, so that the cooling water pipe 2 can be clamped at the top of the support mechanism 8. The bottom end of the telescopic rod 81 and the diagonal support rod 83 are erected on the steel bar mesh below it to form an effective triangular support, thus avoiding unnecessary displacement of the cooling water pipe 2 during concrete pouring.

[0063] In a preferred solution, the telescopic rod 81 is a threaded telescopic rod, and the length can be adjusted by rotating the inner rod and the outer rod.

[0064] The clamping mechanism 85 includes a vertical rod 850 connected to one end of the universal joint 84. A connecting seat 851 is fixedly arranged at the top of the vertical rod 850, which can be docked with the steel bar or the cooling water pipe 2. Clamping components 852 are arranged at both ends of the connecting seat 851, and the steel bar or the cooling water pipe 2 is clamped and fixed through the clamping components 852 at both ends. A control component 853 for controlling the clamping component 852 to clamp is arranged outside the vertical rod 850.

[0065] The clamping component 852 includes two clamp pliers 8520 cross-hinged in the middle through a connecting shaft 8521. The two clamp pliers 8520 form a scissor-like clamping structure. Transmission rods 8522 are hinged at the bottom ends of the two clamp pliers 8520, and the bottom ends of the two transmission rods 8522 are both hinged to a control seat 8523. The end of the connecting shaft 8521 is fixedly connected to the connecting seat 851, so that the clamping effect of the two clamp pliers 8520 can be controlled by adjusting the lifting of the control seat 8523.

[0066] Threads and two opposite lifting grooves 8500 are arranged outside the vertical rod 850.

[0067] The control component 853 includes a lifting ring 8530 movably sleeved outside the vertical rod 850. A limiting block 8531 slidably connected to the lifting groove 8500 is arranged on the inner wall surface of the lifting ring 8530, and extension plates 8532 are arranged on two opposite sides of the outer wall surface. The extension plates 8532 are fixedly connected to the bottom of the corresponding control seat 8523. The lifting ring 8530 can be lifted or lowered outside the vertical rod 850 by the restriction of the limiting block 8531 and the lifting groove 8500, so as to control the lifting of the two control seats 8523 respectively by the two extension plates 8532, and further achieve the effect of controlling the synchronous clamping of the two clamping components 852.

[0068] An internal thread sleeve 8533 is externally threaded and sleeved on the vertical rod 850. The top of the internal thread sleeve 8533 is rotatably connected to the bottom of the lifting ring 8530. By rotating and lifting the internal thread sleeve 8533 on the vertical rod 850, the lifting effect of the lifting ring 8530 can be driven.

[0069] A connecting ring 8535 with a T-shaped cross-section integrally formed is arranged at the bottom of the lifting ring 8530. A rotating ring groove 8534 adapted to the connecting ring 8534 is arranged at the top of the internal thread sleeve 8533. The connecting ring 8535 is slidably arranged in the rotating ring groove 8534, thus realizing the above-mentioned rotatable connection function.

[0070] Arc-shaped grooves adapted to the steel bars and the cooling water pipe 2 are arranged at the top of the connecting seat 851 and the clamping ends of the clamp 8520, facilitating clamping the steel bars or the cooling water pipe 2 therein, and rubber sheets are arranged in the grooves.

[0071] Embodiment 4

[0072] Further described in combination with Embodiment 1, a construction method for controlling the curing temperature of concrete in a large-volume raft foundation includes:

[0073] S1. Assemble the steel bar mesh of the raft 1, and arrange the coiled cooling water pipe 2 in the steel bar mesh. At the same time, arrange temperature sensors.

[0074] S2. Install the formwork 4. The top end of the formwork 4 is higher than the top surface of the formed raft 1, which can form a heat preservation layer, and both the water inlet and outlet ends of the cooling water pipe 2 pass through the formwork 4 and extend to the outside thereof. Then complete the concrete pouring work of the raft 1.

[0075] S3. Connect the water inlet end of the cooling water pipe 2 to the circulation system 3, and the water outlet end passes through and out of the formwork 4 higher than the top surface of the raft 1. After passing through the heat preservation layer, it is connected to the circulation system 3 to form a circulating cooling loop. Arrange temperature sensors in the heat preservation layer. At the same time, a drain valve 206 is arranged on the pipe section of the cooling water pipe 2 located in the heat preservation layer.

[0076] S4. Set up a recovery system on the template 4, with one end connected to the insulation layer and the other end connected to the circulation system 3, and set a filter 210 in the recovery system;

[0077] S5. Cover the top of the template 4 with a heat preservation cover 5 to seal the top of the insulation layer;

[0078] S6. Turn on the circulation system 3 to form a circulating temperature control loop inside and outside the raft 1;

[0079] S7. Monitor the temperature inside the raft 1 and in the insulation layer through the temperature sensor. When the temperature difference between the two is too large, open the drain valve 206 to discharge the water that has undergone heat conversion from the raft 1 into the insulation layer, and at the same time turn on the recovery system to form a further balanced circulating temperature control loop.

[0080] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A large-volume raft foundation concrete maintenance structure, characterized by: The invention comprises a raft plate (1), characterized in that: a template (4) surrounding the raft plate (1) is installed outside the raft plate (1), the top height of the template (4) is higher than the top surface of the raft plate (1), forming a heat-insulating layer; a coiled cooling water pipe (2) is arranged on the steel mesh inside the raft plate (1); the water inlet and outlet of the cooling water pipe (2) both pass through the template (4) and extend to the outside thereof, wherein the water inlet is connected to a circulation system (3); the water outlet passes in and out of the template (4) higher than the top surface of the raft plate (1), passes through the heat-insulating layer, and is connected to the circulation system (3) to form a circulating cooling loop; the top cover of the template (4) is provided with a heat-insulating cover (5) that closes the top of the heat-insulating layer.

2. A large-volume raft foundation concrete curing structure according to claim 1, characterized in that: Temperature sensors are evenly distributed in the raft (1) and the thermal insulation layer.

3. A large-volume raft foundation concrete curing structure according to claim 2, characterized in that: A drain valve (206) is provided on the cooling water pipe (2) in the insulation layer, and the circulating water in the cooling water pipe (2) can be discharged into the insulation layer. A recovery system is also provided on the side of the template (4), one end of which is connected to the insulation layer and the other end of which is connected to the circulation system (3).

4. A large-volume raft foundation concrete curing structure according to claim 3, characterized in that: The cooling water pipe (2) comprises a water inlet pipe (201) penetrating the template (4) and inserted into the raft (1); the insertion end of the water inlet pipe (201) is connected to two cooling pipes (203) via a first tee (202); the two cooling pipes (203) are both coiled and arranged on the steel mesh, and the water outlet ends are both connected to two branch pipes (205) via a second tee (204); the branch pipes (205) pass through the template (4) and penetrate into the thermal insulation layer; a drain valve (206) is provided on the pipe section located in the thermal insulation layer; the ends of the four branch pipes (205) are connected to a central pipe (207); the middle of the central pipe (207) is connected to a circulation pipe (208) penetrating the template (4) and connected to the circulation system (3).

5. A large-volume raft foundation concrete curing structure according to claim 4, characterized in that: The circulation system (3) comprises a sump (301), a temperature riser (302) and a circulating water pump (303) which are sequentially connected via pipelines, wherein the output end of the circulating water pump (303) is connected to the water inlet pipe (201), and the circulating pipe (208) is connected to the sump (301).

6. A large-volume raft foundation concrete curing structure according to claim 5, characterized in that: The recovery system comprises a drainage pipe (209) penetrating the template (4) and communicating with the insulation layer, the other end of the drainage pipe (209) is connected to the water inlet end of the filter (210), and the water outlet end of the filter (210) is connected to the temperature increaser (302) via a recovery pipe (211).

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