CN215669518U - Heat-preservation and moisture-preservation maintenance structure for mass concrete - Google Patents
Heat-preservation and moisture-preservation maintenance structure for mass concrete Download PDFInfo
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- CN215669518U CN215669518U CN202121261070.4U CN202121261070U CN215669518U CN 215669518 U CN215669518 U CN 215669518U CN 202121261070 U CN202121261070 U CN 202121261070U CN 215669518 U CN215669518 U CN 215669518U
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Abstract
The utility model discloses a heat-preservation and moisture-preservation maintenance structure for mass concrete, which is characterized in that a cooling pipe network and a temperature measuring pipe are laid on a reinforcement structure of a bearing platform in advance before concrete pouring construction and are fixed, after the concrete pouring of the bearing platform is finished, cooling water is pumped in by an external water pump to flow in the cooling pipe network to pass through hydration heat in the concrete of the bearing platform, and water flowing out of a water outlet pipe is stored in a core barrel foundation pit to form a reservoir, so that the heat-preservation and moisture-preservation maintenance is carried out on the surface of the concrete of the bearing platform, a layer of heat-preservation water maintenance is constructed between the surface of the concrete and the atmospheric environment, the temperature difference between the surface of the concrete and the interior is ensured to be less than or equal to 20 ℃, the internal and external temperature difference of the mass concrete is reduced, the temperature stress is prevented from being generated, the strength of the concrete is favorably increased, and the generation of cracks is avoided. And, the temperature in the concrete of cushion cap is monitored through the temperature measurement pipe buried underground in advance, is convenient for adjust cooling water flow according to the temperature monitoring result in order to improve the cooling effect.
Description
Technical Field
The utility model relates to the technical field of concrete curing, in particular to a heat-preservation and moisture-retention curing structure for mass concrete.
Background
The modern buildings often relate to large-volume concrete construction, such as high-rise building foundations, large equipment foundations, water conservancy dams and the like, and are mainly characterized by large volume, the minimum dimension of any direction of the minimum section is 1m, the surface coefficient of the concrete is small, and temperature cracks are easy to generate. The cracks of mass concrete are caused by various reasons, mainly because the hydration heat of cement is not easy to dissipate in the concrete, the temperature difference inside and outside the concrete is increased, and the temperature stress is generated. Also, in the case where the surface of concrete loses water, and due to brittleness, unevenness, and the like of the concrete material, shrinkage stress is generated. The tensile strength of the concrete is low, and particularly in the initial stage, the concrete is pulled apart under the action of temperature stress to gradually form through cracks, so that the integrity of the concrete structure is damaged.
SUMMERY OF THE UTILITY MODEL
The utility model provides a heat-preservation and moisture-retention maintenance structure for mass concrete, which aims to solve the technical problem that the mass concrete is easy to crack in the maintenance process.
According to one aspect of the utility model, the utility model provides a heat-preservation and moisture-preservation maintenance structure for mass concrete, which comprises a cushion layer, a cooling pipe network, temperature measurement pipes and a reservoir, wherein the cushion layer is arranged at the bottom of a core barrel foundation pit in advance, the cooling pipe network is fixedly arranged on a steel bar of a bearing platform in advance, the cooling pipe network comprises a plurality of horizontally arranged cooling water pipes, a vertically arranged water inlet pipe and a water outlet pipe, the plurality of cooling water pipes are arranged in parallel, two adjacent cooling water pipes are connected through a 90-degree elbow, one end of the water inlet pipe is connected with an external water pump, the other end of the water inlet pipe is connected with one cooling water pipe positioned at the outermost side, one end of the water outlet pipe is connected with the other cooling water pipe positioned at the outermost side, the other end of the water outlet pipe extends out of the top surface of the bearing platform, the water inlet pipe and the water outlet pipe are led out of the top surface of the bearing platform and have the elevation of more than 1m, the temperature measurement pipes are arranged between the two adjacent cooling water pipes in advance and are arranged vertically, follow vertical a plurality of temperature measurement points that set up on the temperature measurement pipe for the inside temperature of monitoring cushion cap concrete, accomplish the back at cushion cap concrete placement through outside water pump down the cooling pipe network is expert to be watered and is cooled down inside the concrete, the water that the outlet pipe flows holds in order to form in the core section of thick bamboo foundation ditch the cistern for carry out the maintenance of keeping warm moisturizing to the surface of cushion cap concrete.
And further, when the water level in the reservoir exceeds the concrete top surface elevation of the bearing platform by 0.5m, an external water pump pumps water from the reservoir to realize recycling.
Furthermore, the number of the cooling pipe networks is multiple, the multiple cooling pipe networks are symmetrically distributed in the bearing platform, the water inlet pipe of each cooling pipe network is arranged in the middle area of the bearing platform, and the water outlet pipe is arranged in the edge area of the bearing platform.
Further, the distance between the cooling water pipe on the outermost side and the edge of the bearing platform is not more than 1 m.
Furthermore, the cooling water pipe adopts thin-walled steel pipes with the diameter of 48mm, and each thin-walled steel pipe is connected through a threaded joint.
Furthermore, a plurality of cooling water pipes are distributed in a shape of Chinese character 'ji'.
Furthermore, the bottom surface and the top surface of the temperature measuring pipe are respectively provided with a temperature measuring point, the position 0.5m away from the top surface of the bearing platform is provided with a temperature measuring point, and the middle part is provided with a temperature measuring point every 0.5 m-1 m.
Furthermore, the distance between two adjacent cooling water pipes is 1m, and the distances from the temperature measuring pipe to the cooling water pipes on the two sides are both 0.5 m.
Furthermore, the height position of the plurality of cooling water pipes is 1.2m away from the top surface elevation of the bearing platform.
Furthermore, a regulating valve is arranged between the water inlet pipe and the external water pump and used for regulating the flow of cooling water.
The utility model has the following effects:
the heat-preservation and moisture-preservation maintenance structure for the mass concrete is characterized in that a cooling pipe network and a temperature measuring pipe are laid on a reinforcement structure of a bearing platform in advance and are fixed before concrete pouring construction, after the concrete pouring of the bearing platform is finished, cooling water is pumped in by an external water pump, the cooling water flows in the cooling pipe network to pass through hydration heat in the concrete of the bearing platform, and water flowing out of a water outlet pipe is stored in a core barrel foundation pit to form a reservoir, so that the heat-preservation and moisture-preservation maintenance is carried out on the surface of the concrete of the bearing platform, a layer of heat-preservation water maintenance is constructed between the surface of the concrete and the atmospheric environment, the temperature difference between the surface of the concrete and the interior is ensured to be less than or equal to 20 ℃, the requirement that the average temperature between the surface of the concrete and the ambient environment is less than or equal to 25 ℃ in the construction specification of the mass concrete is favorably met, the temperature difference between the interior and the exterior of the mass concrete is reduced, and the temperature stress is prevented, is beneficial to the increase of the concrete strength and avoids the generation of cracks. And, can monitor the temperature in the cushion cap concrete through the temperature measurement pipe buried underground in advance, be convenient for adjust cooling water flow according to the temperature monitoring result in order to improve the cooling effect.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic sectional view of a thermal insulation and moisture retention curing structure of mass concrete according to a preferred embodiment of the present invention.
Fig. 2 is a schematic plan view showing the arrangement of cooling water pipes according to the preferred embodiment of the present invention.
Detailed Description
The embodiments of the utility model will be described in detail below with reference to the accompanying drawings, but the utility model can be embodied in many different forms, which are defined and covered by the following description.
As shown in fig. 1 and 2, a preferred embodiment of the present invention provides a thermal insulation and moisture retention maintenance structure for mass concrete, which includes a cushion layer, a cooling pipe network, a temperature measuring pipe and a reservoir, wherein the cushion layer is pre-disposed at the bottom of a foundation pit of a core tube, and the cushion layer can play roles of water resistance, freezing resistance and the like to improve working conditions of a base layer and a soil foundation, and has good water stability. The cooling pipe network is fixed mounting on the reinforcing bar of cushion cap in advance, the cooling pipe network includes the condenser tube that many levels set up, the inlet tube and the outlet pipe of perpendicular setting, many condenser tube parallel arrangement connect through 90 elbows between two adjacent condenser tubes. The cooling water pipe is positioned and reinforced on a steel bar structure of the bearing platform by adopting steel bars, so that the movement deviation is prevented when the concrete vibrates. The one end of inlet tube links to each other with outside water pump, the other end of inlet tube is connected with a condenser tube that is located the outside, the one end of outlet pipe is connected with another condenser tube that is located the outside, the other end of outlet pipe stretches out the cushion cap top surface, and cushion cap top surface elevation more than 1m is drawn forth to inlet tube and outlet pipe. The temperature measuring pipe is arranged between two adjacent cooling water pipes in advance and is vertically arranged, and a plurality of temperature measuring points are vertically arranged on the temperature measuring pipe and are used for monitoring the temperature inside the concrete of the bearing platform. After cushion cap concrete placement accomplished through outside water pump down the cooling pipe network in the water lead to inside cooling down of concrete, the water that the outlet pipe flows holds in order to form in the foundation ditch of core section of thick bamboo the cistern for carry out the maintenance of moisturizing to the surface of cushion cap concrete.
It can be understood that, in the heat preservation and moisture preservation maintenance structure of mass concrete of this embodiment, the cooling pipe network and the temperature measuring pipe are laid and fixed on the reinforcement structure of the bearing platform in advance before the concrete pouring construction, after the bearing platform concrete pouring is completed, the cooling water is pumped in by the external water pump, the cooling water flows in the cooling pipe network to pass through the hydration heat inside the bearing platform concrete, and the water flowing out of the water outlet pipe is stored in the core barrel foundation pit to form the reservoir, so as to carry out the heat preservation and moisture preservation maintenance on the surface of the bearing platform concrete, a layer of heat preservation water maintenance is constructed between the concrete surface and the atmospheric environment, the temperature difference between the concrete surface and the interior is ensured to be less than or equal to 20 ℃, the requirement that the average temperature between the concrete surface and the surrounding environment required in the large-volume concrete construction specification is favorably met, and the inside and outside temperature difference of the mass concrete is reduced, the temperature stress is prevented, the concrete strength is increased, and the generation of cracks is avoided. And, can monitor the temperature in the cushion cap concrete through the temperature measurement pipe buried underground in advance, be convenient for adjust cooling water flow according to the temperature monitoring result in order to improve the cooling effect.
It can be understood that when the water level in the reservoir exceeds the top surface elevation of the concrete of the bearing platform by 0.5m, part of hydration heat in the concrete of the bearing platform is dissipated, the internal temperature of the concrete is reduced, the water storage capacity in the reservoir can meet the requirement of water flow, and at the moment, an external water pump pumps water from the reservoir to realize recycling, cooling water is not introduced from the outside, and the maintenance cost is reduced.
In addition, the quantity of cooling pipe network is many, for example for 4 sets, and many sets of cooling pipe network are the symmetric distribution in the cushion cap, and the inlet tube of each set of cooling pipe network all sets up the middle zone at the cushion cap, and the outlet pipe all sets up the marginal zone at the cushion cap. Considering that the hydration heat in the concrete of the middle area is more difficult to dissipate than that in the edge area after the concrete of the bearing platform is poured, the hydration heat in the concrete of the middle area can be quickly taken away by the low-temperature cooling water which is just introduced through arranging the water inlet pipe in the middle area of the bearing platform, the cooling uniformity of the whole bearing platform is ensured, and the internal cracks in the middle area of the bearing platform can be effectively prevented. Preferably, the distance between the outermost cooling water pipe of each set of cooling pipe network and the edge of the bearing platform is not more than 1m, so that the heat dissipation effect of the edge of the bearing platform is ensured. The cooling water pipes are distributed in a shape like a Chinese character 'ji', so that the heat dissipation area of the whole cooling pipe network is increased, and a good heat dissipation effect is ensured. Preferably, the distance between two adjacent cooling water pipes is 1m, so that the heat dissipation effect is ensured, and the laying cost of the cooling water pipes is reduced. In addition, the distance from the temperature measuring pipe to the cooling water pipes on the two sides is 0.5m, namely the temperature measuring pipe is positioned in the middle of the two adjacent cooling water pipes. The temperature measurement pipe can set up between two arbitrary adjacent condenser tubes, adopts single-point temperature monitoring promptly, is favorable to controlling the laying cost of temperature measurement pipe, also can all set up a temperature measurement pipe certainly between every two continuous condenser tubes, is favorable to improving the degree of accuracy of temperature monitoring, can carry out the comprehensive consideration according to laying cost and the temperature monitoring result degree of accuracy during actual construction.
In addition, the height position where the cooling water pipes are located is 1.2m away from the top surface elevation of the bearing platform, and the heat dissipation effect of the whole bearing platform is good at the height position.
Preferably, the cooling water pipe is thin-walled steel pipes with the diameter of 48mm, which is beneficial to the rapid conduction of hydration heat, and each thin-walled steel pipe is connected through a threaded joint.
The bottom surface and the top surface of the temperature measuring pipe are respectively provided with a temperature measuring point, the position 0.5m away from the top surface of the bearing platform is provided with a temperature measuring point, the middle part is provided with a temperature measuring point every 0.5 m-1 m, the temperature measuring results of all the temperature measuring points are integrated to carry out integral evaluation to obtain the temperature value inside the concrete of the bearing platform, and the accuracy of the temperature measuring results is ensured.
In addition, preferably, a regulating valve is arranged between the water inlet pipe and the external water pump and used for regulating the flow rate of the cooling water. Constructors can control the opening degree of the regulating valve according to a temperature monitoring result, when monitoring that the temperature inside the concrete of the bearing platform is higher and is different from the water temperature in the external water storage tank by more than 20 ℃, the opening degree of the regulating valve is controlled to be increased, the cooling water flow is improved to realize rapid cooling, and when monitoring that the temperature inside the concrete of the bearing platform is reduced, namely the temperature difference between the temperature inside the concrete of the bearing platform and the water temperature in the external water storage tank is less than 20 ℃, the opening degree of the regulating valve is controlled to be reduced, and the cooling water flow is reduced.
In the construction process, a cooling pipe network and a temperature measuring pipe are laid in advance, and the cooling pipe network is debugged by integrally flowing water, so that the water pipe is smooth and does not leak water. Then pouring concrete on the bearing platform, starting to feed water for cooling at the initial stage 8 hours after the pouring of the concrete on the bearing platform is finished, wherein the water quality of the cooling water is in accordance with the standard of water for concrete maintenance in the building engineering, and generally tap water is adopted, and the temperature of the tap water is the natural temperature and is usually between 8 and 15 ℃. When the water level in the reservoir reaches 0.5m higher than the top surface elevation of the bearing platform, stopping introducing the tap water, and placing the water inlet of the water pump in the reservoir for water diversion. And (3) performing circulating water-through maintenance by adopting water in the reservoir until the water in the reservoir is placed below a bearing platform surface, and performing construction position of the basement structure, wherein the process is generally 5-7 days. In the stage, water is directly pumped from the livestock pool, and the water returns to the livestock pool after absorbing heat through the cooling water pipe, and circulating water can supplement heat loss after the heat dissipation of the surface of the livestock pool, so that the livestock pool is kept at a certain water temperature to carry out heat preservation and maintenance on concrete, and the temperature difference between the interior of the concrete and the surface of the concrete can be obviously reduced. After the concrete is cured for a period of time, the designed strength is about 80 percent, and the curing period is ended after the water level of the livestock pool is reduced. At this stage, the top surface of the bearing platform is constructed with a basement structure, or water in the livestock water pool is utilized for circulating water-through maintenance, so that the temperature in the concrete is reduced, and when the difference between the temperature in the concrete and the temperature of the surrounding environment is less than or equal to 25 ℃, the water-through maintenance can be stopped. Considering that the concrete temperature of the bearing platform rises sharply in the first 1-2 days, reaches a peak value in the second 2 days or the third 3 days, then slowly falls, and reaches a temperature difference with the atmosphere not more than 20 ℃ in about 8-10 days, therefore, the temperature is measured every 2 hours in 1-2 days after the concrete pouring is finished, every 4 hours in 3-5 days, every 8 hours in 6 days and then, the atmospheric temperature and the water temperature in the water storage tank are measured at the same time, and the record is made until the difference between the internal temperature of the concrete and the average temperature of the atmospheric environment is less than 20 ℃. The specific temperature measurement mode is as follows: and measuring the temperature by adopting a thermometer, sequentially placing preset temperature measuring points along the pipe wall of the temperature measuring pipe until the temperature is stable, quickly taking out after a period of time, and immediately reading. After the concrete of the bearing platform is cooled, adopting micro-expansion cement mortar with the strength higher by one grade than that of the concrete of the bearing platform for grouting, injecting the micro-expansion cement mortar from one end of the pipeline until the other end of the pipeline is raised, and ensuring that the cooling water pipe in the bearing platform is tightly filled with the mortar. In addition, after the concrete of the cap is poured, it is preliminarily covered with a plastic film. After initial setting, hot water flowing out of the cooling water pipe is used for heat preservation and moisture preservation maintenance. When dismantling the cushion cap side form, avoid sled to cause the damage to the concrete edges and corners when moving the template, during the maintenance, avoid equipment, heavy object to the striking of cushion cap edges and corners.
In practical application, the applicant adopts the heat-preservation and moisture-preservation maintenance structure in the large-volume concrete construction of a core tube bearing platform of a certain built building, no through crack occurs, no crack with the thickness of more than 0.1mm occurs on the surface of concrete, and no water seepage phenomenon occurs in the whole bearing platform. And the strength of the bearing platform concrete is improved rapidly under the condition of heat preservation, moisture preservation and maintenance, and the strength reaches 80% of the designed strength in 7 days and reaches 114% of the designed strength in 28 days after the physical detection is carried out through resilience. Therefore, the structural design of internal-falling external-protection circulating water supply is adopted to control the cracks of the mass concrete construction, so that a good effect can be obtained, and the mass concrete construction quality is effectively ensured.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a heat preservation maintenance structure of moisturizing of bulky concrete, a serial communication port, including bed course, cooling pipe network, temperature measurement pipe and cistern, the bed course sets up the bottom at core section of thick bamboo foundation ditch in advance, the cooling pipe network is fixed mounting on the reinforcing bar of cushion cap in advance, the cooling pipe network includes the condenser tube that many levels set up, the inlet tube and the outlet pipe of perpendicular setting, many condenser tube parallel arrangement connect through 90 elbows between two adjacent condenser tubes, the one end and the outside water pump of inlet tube link to each other, the other end and the condenser tube that are located the outside of inlet tube are connected, the one end of outlet pipe is connected with another condenser tube that is located the outside, the other end of outlet pipe stretches out the cushion cap top surface, and cushion cap top surface elevation more than 1m is drawn forth to inlet tube and outlet pipe, the temperature measurement pipe sets up between two adjacent condenser tubes in advance and set up perpendicularly, follow vertical a plurality of temperature measurement points that set up on the temperature measurement pipe for the inside temperature of monitoring cushion cap concrete, accomplish the back at cushion cap concrete placement through outside water pump down the cooling pipe network is expert to be watered and is cooled down inside the concrete, the water that the outlet pipe flows holds in order to form in the core section of thick bamboo foundation ditch the cistern for carry out the maintenance of keeping warm moisturizing to the surface of cushion cap concrete.
2. The mass concrete thermal insulation moisture retention curing structure as claimed in claim 1, wherein when the water level in the reservoir is 0.5m higher than the concrete top surface elevation of the bearing platform, an external water pump pumps water from the reservoir for recycling.
3. The bulk concrete thermal insulation, moisturizing and curing structure as claimed in claim 1, wherein the number of the cooling pipe networks is multiple, the multiple sets of cooling pipe networks are symmetrically distributed in the bearing platform, the water inlet pipe of each set of cooling pipe network is arranged in the middle area of the bearing platform, and the water outlet pipe of each set of cooling pipe network is arranged in the edge area of the bearing platform.
4. The mass concrete thermal insulation moisture retention maintenance structure according to claim 3, wherein the outermost cooling water pipes are not more than 1m from the edge of the cap.
5. The bulk concrete thermal insulation, moisture retention and maintenance structure according to claim 1, wherein the cooling water pipes are thin-walled steel pipes with a diameter of 48mm, and each thin-walled steel pipe is connected through a threaded joint.
6. The mass concrete thermal insulation, moisture retention and maintenance structure according to claim 1, wherein a plurality of the cooling water pipes are distributed in a zigzag shape.
7. The bulk concrete thermal insulation, moisturizing and curing structure according to claim 1, wherein the bottom surface and the top surface of the temperature measuring pipe are respectively provided with a temperature measuring point, the position 0.5m away from the top surface of the bearing platform is provided with a temperature measuring point, and the middle part of the temperature measuring pipe is provided with a temperature measuring point every 0.5 m-1 m.
8. The bulk concrete thermal insulation, moisture retention and maintenance structure according to claim 1, wherein the distance between two adjacent cooling water pipes is 1m, and the distance between the temperature measuring pipe and the cooling water pipes on two sides is 0.5 m.
9. The structure of claim 1, wherein the cooling water pipes are located at a height 1.2m from the top surface of the platform.
10. The mass concrete thermal insulation, moisture retention and maintenance structure according to claim 1, wherein a regulating valve is arranged between the water inlet pipe and the external water pump for regulating the flow of cooling water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121261070.4U CN215669518U (en) | 2021-06-07 | 2021-06-07 | Heat-preservation and moisture-preservation maintenance structure for mass concrete |
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| CN202121261070.4U CN215669518U (en) | 2021-06-07 | 2021-06-07 | Heat-preservation and moisture-preservation maintenance structure for mass concrete |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142693A (en) * | 2022-07-20 | 2022-10-04 | 中国建筑第四工程局有限公司 | Control device for cracks of steel plate concrete shear wall and construction method |
| CN115262974A (en) * | 2022-08-04 | 2022-11-01 | 深圳市市政工程总公司 | Intelligent control construction method for large-volume concrete cracks |
-
2021
- 2021-06-07 CN CN202121261070.4U patent/CN215669518U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142693A (en) * | 2022-07-20 | 2022-10-04 | 中国建筑第四工程局有限公司 | Control device for cracks of steel plate concrete shear wall and construction method |
| CN115262974A (en) * | 2022-08-04 | 2022-11-01 | 深圳市市政工程总公司 | Intelligent control construction method for large-volume concrete cracks |
| CN115262974B (en) * | 2022-08-04 | 2023-08-18 | 深圳市市政工程总公司 | Intelligent control construction method for large-volume concrete cracks |
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