Concrete foundation maintenance structure

Abstract

The invention relates to the field of large-scale concrete foundation construction processes, in particular to a concrete foundation maintenance structure capable of effectively preventing phase-change materials on the surface of a concrete foundation from losing efficacy at high temperature, which comprises a concrete foundation and a heat preservation pad arranged on the surface of the concrete foundation, and the heat preservation pad comprises the phase-change materials and a permeable layer. The permeable layer is arranged on the surface of the concrete foundation; comprising a permeable layer water pipe, the permeable layer water pipe comprises permeable holes, and the permeable holes are formed in a permeable layer. The method is particularly suitable for the curing process of the large-scale concrete foundation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of large concrete foundation construction process, and particularly relates to a concrete foundation maintenance structure. BACKGROUND

[0002] In the setting process after concrete pouring, cement hydration heat will be generated. In the construction of mass concrete such as super high building bottom plate, large bridge pile cap, dam and fan foundation, the temperature difference cracks caused by cement hydration heat are often penetrating, which will cause permanent and cliff-like decrease of the bearing capacity of the large concrete foundation, and will seriously damage the structural integrity, waterproofness and durability. One of the main reasons for the temperature difference cracks is that the surface of the mass concrete cools down quickly, while the temperature generated by the cement hydration heat rises sharply to 60 degrees Celsius, and the hydration heat generated inside cools down and dissipates slowly. The large internal and external temperature difference will generate a huge tensile stress, which will crack the concrete.

[0003] In view of the above-mentioned temperature difference cracks, the scheme with the publication number CN120649441A provides a solution. Specifically, temperature sensors are arranged on the side of the concrete and the outside, cooling water pipes are arranged in the concrete, the inlet water temperature of the cooling water pipes is ≤15℃, and a heat preservation pad made of paraffin / fatty acid composite phase change material is arranged to preserve the surface of the concrete. The temperature sensors detect the outside temperature and the concrete temperature, and transmit the detection results to the cloud platform for calculation and analysis to analyze whether the temperature difference is greater than 25℃. If the temperature difference is greater than 25℃, the flow of the cooling water in the cooling water pipes is increased. The heat preservation pad made of phase change material cooperates with the cooling water pipes arranged in the concrete to control the release of the hydration heat of the concrete, and prevent the internal and external temperature difference of the concrete foundation from being too large during the release of the hydration heat of the concrete. However, the phase change material may face various damage risks in a high temperature environment, mainly including encapsulation rupture caused by thermal expansion, thermal stability decline and performance attenuation. During the concrete pouring construction, once the weather temperature is too high, and the large amount of hydration heat generated by the large concrete foundation is added, the high temperature borne by the phase change material will cause the phase change material to fail, and thus the temperature regulation function of the phase change material cannot be played. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a concrete foundation maintenance structure capable of effectively preventing the phase change material on the surface of the concrete foundation from failing under high temperature.

[0005] The technical solution adopted by the present application to solve the technical problem is: a concrete foundation maintenance structure, comprising a concrete foundation and a heat preservation pad arranged on the surface of the concrete foundation, the heat preservation pad comprising a phase change material, comprising a water permeable layer, the water permeable layer being arranged on the surface of the concrete foundation; comprising a water permeable layer water pipe, the water permeable layer water pipe comprising water permeable holes, the water permeable holes being arranged on the water permeable layer.

[0006] Further, the template is arranged on the concrete foundation surface, and the water-permeable layer is arranged between the template and the concrete foundation surface.

[0007] Further, the water pipe of the water-permeable layer is a hollow bent pipe arranged between the template and the concrete foundation surface.

[0008] Further, the water-permeable layer comprises any one of a water-permeable non-woven fabric and a water-permeable film.

[0009] Further, the phase change material comprises any one of a paraffin-expanding graphite composite phase change material and a paraffin-fatty acid composite phase change material.

[0010] Further, the heat sink is arranged, and the water pipe of the water-permeable layer is communicated with the heat sink.

[0011] Further, the PLC controller, the temperature sensor and the variable frequency water tank are arranged, the water pipe of the water-permeable layer is communicated with the variable frequency water tank, the water pipe of the water-permeable layer, the heat sink and the variable frequency water tank form a closed water circulation, the temperature sensor is arranged on the concrete foundation surface, and the PLC controller is electrically connected with the temperature sensor and the variable frequency water tank respectively.

[0012] Further, the supplementary water bag is arranged, and the supplementary water bag is communicated with the variable frequency water tank.

[0013] Further, the internal water pipe is arranged in the concrete foundation, the water outlet of the internal water pipe is communicated with the heat sink, and the water inlet of the internal water pipe is communicated with the variable frequency water tank.

[0014] Further, the concrete foundation is a fan foundation, and the thermal insulation pad is arranged on the surface of the fan foundation.

[0015] The present application has the following advantages: In actual use, the phase change material of the thermal insulation pad absorbs heat at high temperature and releases heat at low temperature, thereby realizing temperature regulation within a certain range. However, when the high temperature of the outside world is superimposed on the hydration heat, the temperature borne by the phase change material is higher than the upper limit of the phase change material. At this time, water can be transported to the water-permeable layer through the water-permeable holes of the water pipe of the water-permeable layer, and the water can be evenly distributed on the concrete surface along the water-permeable layer, thereby reducing the temperature borne by the phase change material, effectively protecting the phase change material in the thermal insulation pad, preventing problems such as packaging rupture, heat stability decline and performance attenuation caused by high temperature. The water-permeable layer cooling method is not only simple to construct, but also can simultaneously maintain the moisture of the concrete surface.

[0016] Second, by setting a template on the concrete foundation surface and placing the permeable layer in the interlayer between the template and the concrete foundation surface, the permeable layer can be stably attached to the concrete foundation surface, thereby improving the heat dissipation and cooling effect.

[0017] Third, the temperature near the phase change material can be monitored in real time through the radiator, variable frequency water tank, PLC controller, and temperature sensor. When the temperature near the phase change material is detected to be close to the upper limit of the phase change material's bearing capacity, the water supply to the permeable layer pipe can be turned on to achieve cooling.

[0018] This invention is particularly applicable to the curing process of large concrete foundations. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the present invention applied to a wind turbine foundation.

[0020] Figure 2 This is a schematic diagram of the internal water pipes of the present invention being arranged in a spiral winding manner inside the concrete of the wind turbine foundation.

[0021] The components in the diagram are labeled as follows: fan foundation 1, fan foundation base 100, temperature sensor 110, cable 111, internal water pipe 120, radiator return water pipe 121, radiator 130, variable frequency water tank 140, PLC controller 150, water replenishment bag 160, fan foundation base side 11, template 200, hollowed-out bent pipe 210, insulation pad 220, insulation pad cable 221, and permeable non-woven fabric 230. Detailed Implementation

[0022] The invention will be further described below with reference to the accompanying drawings.

[0023] like Figure 1 As shown, the wind turbine foundation 1 is a large concrete foundation. The wind turbine foundation base 100 of the wind turbine foundation 1, due to its downwardly flared shape, is a key area for preventing temperature difference cracks. Figure 1 In the embodiment shown, the area of ​​the wind turbine foundation base side 11 at the bottom of the wind turbine foundation base 100 is used as the area for applying the curing structure, and the temperature of the concrete on the wind turbine foundation base side 11 is controlled.

[0024] First, the heat preservation pad 220 is arranged on the outer periphery of the fan foundation base side edge 11, and the phase change material contained in the heat preservation pad 220 is a paraffin-expansion graphite composite phase change material. When the internal temperature of the fan foundation 100 concrete rises to the phase change temperature of the paraffin-expansion graphite composite phase change material, the paraffin-expansion graphite composite phase change material absorbs heat and changes from solid to liquid, slowing down the temperature rise speed. When the temperature drops below 40℃, the paraffin-expansion graphite composite phase change material releases heat and solidifies. Specifically, the paraffin-expansion graphite composite phase change material is packaged in a thin aluminum foil bag to form the heat preservation pad 220. When the concrete surface temperature of the fan foundation base 100 rises or falls sharply, the heat preservation pad 220 can release or absorb heat as required, achieve a certain degree of temperature control, and prevent the internal and external temperature difference from being too large. Subsequently, a circle of water-permeable non-woven fabric 230 is arranged on the outer periphery of the fan foundation base side edge 11. The water-permeable non-woven fabric 230 can be in direct contact with the surface of the fan foundation base side edge 11, or can be arranged in direct contact with the heat preservation pad 220. The water-permeable non-woven fabric is a water-permeable geosynthetic material made of synthetic fibers through needle punching or weaving process, which is a common material at present. Then the hollow bent pipe 210 is arranged. The hollow bent pipe 210 is a pipeline with water-permeable holes on the pipe wall. The pipeline can be commonly arranged in a serpentine shape, so as to increase the contact area of the hollow bent pipe 210 and the water-permeable non-woven fabric 230. When the water flows through the hollow bent pipe 210, part of the water will flow out through the water-permeable holes on the pipe wall of the hollow bent pipe 210, and then flow to the water-permeable non-woven fabric 230 to wet the water-permeable non-woven fabric 230, thereby achieving the cooling of the water-permeable non-woven fabric 230. The wet water-permeable non-woven fabric 230 can also serve the purpose of moisture curing of the concrete. The surface of the water-permeable non-woven fabric 230 is provided with a temperature sensor 110, which is electrically connected to the PLC controller 150 through the cable 111. The heat preservation pad 220 is also provided with a temperature sensor for detecting the temperature of the heat preservation pad 220, which is electrically connected to the PLC controller 150 through the heat preservation pad cable 221. The hollow bent pipe 210, the variable frequency water tank 140, the radiator return pipe 121 and the radiator 130 form a closed circulation pipeline for water flow transportation. When the PLC controller 150 detects that the temperature of the heat preservation pad 220 is too high, the variable frequency water tank 140 is started to supply water to the hollow bent pipe 210. The water flows through the hollow bent pipe 210 to the vicinity of the water-permeable non-woven fabric 230 and flows to the water-permeable non-woven fabric 230 through the water-permeable holes on the hollow bent pipe 210. The water flows to the surface of the fan foundation base side edge 11 and the heat preservation pad 220, and flows downward under the action of gravity to take away the excess heat, thereby reducing the high temperature of the heat preservation pad 220 and effectively protecting the phase change material contained in the heat preservation pad 220. The reduced water in the variable frequency water tank 140 can be supplemented in time through the supplementary water bag 160 connected with the variable frequency water tank 140.

[0025] Further, a layer of template 200 can be provided outside the water-permeable non-woven fabric 230, i.e. the water-permeable non-woven fabric 230 is arranged in the interlayer between the template 200 and the side edge 11 of the fan foundation base. The template 200 can better fix the water-permeable non-woven fabric 230 and the hollowed-out elbow pipe 210 on the side edge 11 of the fan foundation base, and ensure the stability of the cooling effect of the water-permeable non-woven fabric 230.

[0026] Figure 2 The embodiment of the internal water pipe 120 laid inside the fan foundation 1 during the setting of the concrete is shown. In combination with the gradually enlarged downward flared shape of the fan foundation base 100, the internal water pipe 120 is spirally arranged inside the concrete foundation. The water outlet of the internal water pipe 120 is communicated with the radiator 130 through the radiator backwater pipe 121, and the water inlet of the internal water pipe 120 is communicated with the variable frequency water tank 140, thereby forming a closed water circulation composed of the internal water pipe 120, the radiator 130 and the variable frequency water tank 140. The hydration heat generated inside the fan foundation 1 during the setting of the concrete is promptly removed, and the temperature difference between the inside and outside of the concrete foundation during the hydration heat release process of the concrete is effectively controlled. After the maintenance of the fan foundation 1 is completed, the internal water pipe 120 needs to be grouted. The cement mortar grouting is started from the lower pipe inlet of the internal water pipe 120.

Claims

1. Concrete foundation maintenance structure comprising a concrete foundation and an insulation mat (220) arranged on the surface of the concrete foundation, said insulation mat (220) comprising a phase change material, characterized in that, The application relates to a water-permeable layer, a water-permeable layer water pipe and a concrete foundation. The water-permeable layer water pipe comprises water-permeable holes arranged on the water-permeable layer. The application relates to a template (200) arranged on a concrete foundation surface, and a water-permeable layer arranged between the template (200) and the concrete foundation surface.

2. The concrete foundation curing structure of claim 1, wherein: The water-permeable layer water pipe is a hollow bent pipe (210) arranged between the template (200) and the concrete foundation surface.

3. The concrete foundation maintenance structure of claim 2, wherein: The water-permeable layer comprises any one of a water-permeable non-woven fabric (230) and a water-permeable film.

4. A concrete foundation curing structure according to any one of claims 1 to 3, wherein: The phase change material comprises any one of a paraffin-expanding graphite composite phase change material and a paraffin-fatty acid composite phase change material.

5. A concrete foundation curing structure as claimed in any one of claims 1 to 3, wherein: The application relates to a radiator (130) in communication with the water-permeable layer water pipe.

6. A concrete foundation curing structure as claimed in any one of claims 1 to 3, wherein: The application relates to a PLC controller (150), a temperature sensor (110) and a variable frequency water tank (140), the water-permeable layer water pipe is in communication with the variable frequency water tank (140), the water-permeable layer water pipe, the radiator (130) and the variable frequency water tank (140) form a closed water circulation, the temperature sensor (110) is arranged on the concrete foundation surface, and the PLC controller (150) is electrically connected with the temperature sensor (110) and the variable frequency water tank (140) respectively.

7. The concrete foundation maintenance structure of claim 6, wherein: The application relates to a supplementary water bag (160) in communication with the variable frequency water tank (140).

8. The concrete foundation maintenance structure of claim 7, wherein: The application relates to an internal water pipe (120) spirally arranged in the concrete foundation, a water outlet of the internal water pipe (120) is in communication with the radiator (130), and a water inlet of the internal water pipe (120) is in communication with the variable frequency water tank (140).

9. The concrete foundation maintenance structure of claim 7, wherein: The concrete foundation is a fan foundation (1), and a heat preservation pad (220) is arranged on the surface of the fan foundation (1).

10. A concrete foundation curing structure as claimed in any one of claims 1 to 3 wherein: ​

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