WO2021134844A1 - 一种防太阳辐射能的混凝土箱体结构及桥梁箱体 - Google Patents

一种防太阳辐射能的混凝土箱体结构及桥梁箱体 Download PDF

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WO2021134844A1
WO2021134844A1 PCT/CN2020/072894 CN2020072894W WO2021134844A1 WO 2021134844 A1 WO2021134844 A1 WO 2021134844A1 CN 2020072894 W CN2020072894 W CN 2020072894W WO 2021134844 A1 WO2021134844 A1 WO 2021134844A1
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pipeline
concrete
solar radiation
radiation energy
box girder
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PCT/CN2020/072894
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English (en)
French (fr)
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吴旻
李欣霖
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五邑大学
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type

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  • the invention relates to the technical field of concrete boxes, in particular to a concrete box structure for preventing solar radiation energy and a bridge box.
  • Box structure is a relatively common mass concrete structure in construction engineering. Because of its high torsion rigidity and uniform internal force distribution, it is widely used in bridge structures, such as the main girder of continuous rigid frame bridges, the pylons of cable-stayed bridges and suspension bridges, and the piers of long-span bridges. Because the box girder is exposed to direct solar radiation during bridge work, and the thermal conductivity of the concrete itself is poor, the surface temperature of the box girder structure changes quickly, and the internal temperature changes slowly. The box girder is also a large volume of concrete, and the temperature difference between the inside and the outside is also It will only be bigger. Therefore, the box girder often generates temperature stress due to the excessive temperature difference between the inside and the outside, causing its surface to crack, which seriously affects the integrity and durability of the structure, endangers the service life of the structure, and even causes disasters in severe cases.
  • the purpose of the present invention is to provide a concrete box structure and a bridge box for preventing solar radiation energy, which can effectively reduce the temperature difference at different positions on the box structure, especially the mass concrete, and avoid the appearance of the structure due to excessive local temperature difference stress. Cracked or damaged.
  • the present invention provides a concrete box structure and a bridge box for preventing solar radiation energy, including a concrete base and a circulating pipeline;
  • the concrete matrix is a rectangular parallelepiped structure
  • the circulation pipeline includes a spiral pipeline and a straight pipeline, the spiral pipeline is arranged in the side wall of the concrete matrix; one end of the straight pipeline is connected to the head end of the spiral pipeline, and the other end is connected to the end of the spiral pipeline , To realize the connection of spiral pipeline and linear pipeline into a closed loop;
  • the circulation pipeline is provided with a liquid inlet, an exhaust port and a pipeline pressure regulating valve, and the liquid inlet and the exhaust port are respectively provided with valves;
  • Cooling water is injected into the circulation pipeline.
  • the circulation pipeline is provided with a detection port, and the detection port is provided with a pressure gauge.
  • the liquid inlet is arranged at one end of the spiral pipeline.
  • the exhaust port is arranged at the other end of the spiral pipeline.
  • the liquid inlet extends in a direction perpendicular to the side surface of the concrete base.
  • the exhaust port extends in a direction perpendicular to the side surface of the concrete base.
  • the air pressure in the circulation pipeline is 10 kPa.
  • the spiral pipeline is a square spiral pipeline.
  • the linear pipeline is located on the central axis of the spiral pipeline.
  • a plurality of the above-mentioned concrete box structures for preventing solar radiation energy are included, and the central axes of the plurality of concrete box structures are located on the same horizontal line.
  • the solar radiation-proof concrete box structure and the bridge box of the present invention can not only cool down during the concrete pouring and molding stage, but also solve the problem of increasing the temperature difference between the inside and outside of the box structure and the bridge box caused by solar radiation energy during operation.
  • the resulting temperature stress exacerbates the problem of concrete cracks. It can effectively reduce the temperature difference at different positions on the structure, especially the mass concrete, and prevent the structure from cracking or damage due to excessive local temperature difference stress.
  • Fig. 1 is a schematic structural diagram of a concrete box structure for preventing solar radiation energy provided by an embodiment of the present invention.
  • a concrete box structure for preventing solar radiation energy and a bridge box including a concrete base 1 and a circulating pipeline;
  • the concrete base 1 is a rectangular parallelepiped structure
  • the circulation pipeline includes a spiral pipeline 2 and a linear pipeline 3.
  • the spiral pipeline 2 is arranged in the side wall of the concrete matrix 1; one end of the linear pipeline 3 is connected to the head end of the spiral pipeline 2 and the other end Connect the end of the spiral pipeline 2 to realize the connection of the spiral pipeline 2 and the linear pipeline 3 into a closed loop;
  • the circulation pipeline is provided with a liquid inlet 4, an exhaust port 5 and a pipeline pressure regulating valve, and the liquid inlet 4 and the exhaust port 5 are respectively provided with valves;
  • Cooling water is injected into the circulation pipeline.
  • the principle of the preferred embodiment of the present invention is: by setting a circulating pipe in the concrete base 1 and injecting cooling water into the circulating pipe, the structure of the circulating pipe and the surrounding concrete base 1 essentially forms a kind of "heat exchanger", cooling water It is equivalent to the heat exchange medium; because the two states of water, liquid and gas, both have good fluidity, the cooling water at different positions in the circulation pipe can be reduced under the condition that the temperature difference between different parts on the concrete substrate 1 is not large.
  • the temperature is also basically the same.
  • the local temperature on the concrete substrate 1 changes, heat exchange will occur between the concrete at the corresponding position and the cooling water in the circulating pipe. Since the air pressure in the circulating pipe is set in advance, the water only needs to be at a certain level.
  • Vaporization can occur at the temperature, and the vaporization of water is an endothermic process. It can absorb the heat in the over-temperature part of the concrete matrix 1, and then transport the heat to the other side by flowing in the circulation pipeline. In the lower temperature part, because the water is flowing, the system is recyclable. As a result, the temperature difference in the box structure is small, which indirectly disperses and relieves the temperature difference stress, which can effectively prevent the large temperature difference stress from appearing in the base body and protect the structure.
  • the air pressure in the circulation pipeline is set to 10kpa; while the solar radiation energy cannot be directly irradiated to the opposite sides of the box beam at the same time.
  • the solar radiation energy directly irradiates the east side of the box girder, while the west side is not directly irradiated.
  • the temperature of the concrete on the east side of the box girder is theoretically higher than that on the west side, and the temperature of the concrete on the east side is up to
  • the boiling point of the water under the pressure of 10kpa that is, 45°C
  • heat exchange occurs between the concrete at the corresponding position and the water in the liquid storage pipe, so that the heat is transferred from the high temperature area on the box to the low temperature.
  • Area reduce the temperature difference between different positions on the substrate; and from the afternoon to the evening, the solar radiation energy is directly irradiated to the west side of the box girder, and the east side is not directly irradiated.
  • the reaction principle is the same as that described above.
  • the concrete box structure of the preferred embodiment of the present invention can not only reduce the temperature during the concrete pouring and forming stage, but also solve the problem of increasing the temperature difference between the inside and the outside caused by the solar radiation energy of the box structure and the bridge box during operation, resulting in increased temperature stress.
  • a detection port 6 is provided on the circulation pipeline, and the detection port 6 is provided with a pressure gauge.
  • the liquid storage pipeline is closed again. Therefore, it is necessary to consider the pressure margin for the phase change of the water.
  • the pressure in the liquid storage pipeline can be monitored in real time when filling water to control the filling amount of water.
  • the liquid inlet 4 is arranged at one end of the spiral pipeline 2.
  • the exhaust port 5 is arranged at the other end of the spiral pipeline 2.
  • the liquid inlet 4 extends in a direction perpendicular to the side surface of the concrete base 1.
  • the exhaust port 5 extends in a direction perpendicular to the side surface of the concrete base 1.
  • the air pressure in the circulation pipeline is 10 kPa.
  • the spiral pipeline 2 is a square spiral pipeline 2.
  • the square spiral pipeline 2 can better adapt to the cross-sectional shape of the box structure, and the square spiral is also convenient for processing and installation.
  • the linear pipeline 3 is located on the central axis of the spiral pipeline 2.
  • the linear pipeline 3 passes through the middle of the spiral pipeline 2 to further expand the heat exchange area between the circulating pipeline and the surrounding structure.
  • a plurality of concrete box structures for preventing solar radiation energy as described above are included, and the central axes of the plurality of concrete box structures are located on the same horizontal line.
  • multiple pipes can be prefabricated for use according to the size of the structure first. For specific laying, after the reinforcement of the structure is completed, the multiple pipes are connected into a spiral through joints and placed in the steel frame of the structure, and then connected with The steel frame is poured into the structure together.
  • the circulation pipeline includes water under various air pressures.
  • the boiling points of water at different pressures are different.
  • the air pressure in the liquid storage pipeline can be adjusted according to actual needs to make the water vaporize and liquefy at different temperatures. Endothermic and exothermic.
  • different low-boiling phase change substances can be used instead of water.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

本发明涉及混凝土箱体技术领域，具体公开了一种防太阳辐射能的混凝土箱体结构及桥梁箱体，所述混凝土箱体结构包括混凝土基体和循环管路；所述混凝土基体为长方体结构；所述循环管路包括螺旋管路和直线管路，所述螺旋管路设置混凝土基体的侧壁内；所述直线管路的一端连接螺旋管路的首端，另一端连接螺旋管路的末端，实现螺旋管路与直线管路连接成一个封闭回路；所述循环管路上设置有进液口、排气口和管道调压阀，所述进液口和排气口上分别设置有阀门；所述循环管路内注入有冷却水。本发明的混凝土箱体结构可以有效降低箱体结构尤其是大体积混凝土上不同位置处的温差，避免结构体因局部温差应力过大而出现开裂或损坏。

Description

一种防太阳辐射能的混凝土箱体结构及桥梁箱体 技术领域
本发明涉及混凝土箱体技术领域，特别是涉及一种防太阳辐射能的混凝土箱体结构及桥梁箱体。
背景技术
箱体结构，是建筑工程中较为常见的一种大体积混凝土结构。由于其抗扭刚度大、内力分布均匀等优点，被广泛应用于桥梁结构之中，例如连续刚构桥的主梁、斜拉桥和悬索桥的索塔、大跨桥梁的桥墩等。由于箱梁在桥梁工作中遭受太阳辐射能的直射，加之混凝土本身的热传导性能较差，箱梁结构表面温度变化较快，内部温度变化较慢，而箱梁又是大体积混凝土，内外温差也只会更大。因此箱梁常常由于内外温差过大产生温度应力，导致其表面开裂，严重影响着结构的整体性和耐久性，危害到结构的使用寿命，严重时甚至会造成灾害。
现有的技术大多是针对混凝土浇筑过程通过预埋冷却水管持续通水进行降温处理；又或是将大体积混凝土中的结构钢筋、构造钢筋、措施钢筋与外部外露钢筋形成降温散热体系被动“外溢”降温。但是采用冷却水管预埋，只是针对于混凝土在浇筑成型的过程，对于后续箱体结构工作状态时无任何相关措施，且降温过程一般需15-18天持续通水，浪费人力物力。被动“外溢”降温体系与前者相似，都是针对混凝土浇筑成型过程，且降温速率较慢。
发明内容
本发明的目的是提供一种防太阳辐射能的混凝土箱体结构及桥梁箱体，有效降低箱体结构尤其是大体积混凝土上不同位置处的温差，避免结构体因局部温差应力过大而出现开裂或损坏。
为了解决上述技术问题，本发明提供一种防太阳辐射能的混凝土箱体结构及桥梁箱体，包括混凝土基体和循环管路；
所述混凝土基体为长方体结构；
所述循环管路包括螺旋管路和直线管路，所述螺旋管路设置混凝土基体的侧壁内；所述直线管路的一端连接螺旋管路的首端，另一端连接螺旋管路的末端，实现螺旋管路与直线管路连接成一个封闭回路；
所述循环管路上设置有进液口、排气口和管道调压阀，所述进液口和排气口上分别设置有阀门；
所述循环管路内注入有冷却水。
作为优选方案，所述循环管路上设置有检测口，所述检测口设置有压力计。
作为优选方案，所述进液口设置于螺旋管路的一端。
作为优选方案，所述排气口设置于螺旋管路的另一端。
作为优选方案，所述进液口向垂直于混凝土基体侧面的方向延伸。
作为优选方案，所述排气口向垂直于混凝土基体侧面的方向延伸。
作为优选方案，所述循环管路内的气压为10kPa。
作为优选方案，所述螺旋管路为方形螺旋管路。
作为优选方案，所述直线管路位于所述螺旋管路的中心轴线上。
作为优选方案，包括多个上述所述的防太阳辐射能的混凝土箱体结构，多个所述混凝土箱体结构的中心轴位于同一水平线上。
本发明具有以下有益效果：
本发明的防太阳辐射能的混凝土箱体结构及桥梁箱体不仅能在混凝土浇筑成型阶段进行降温，还能够解决箱体结构和桥梁箱体在工作运行时受太阳辐射能导致内外温差增大，产生温度应力加剧混凝土裂缝的问题。可以有效降低结构体尤其是大体积混凝土上不同位置处的温差，避免结构体因局部温差应力过大而出现开裂或损坏。
附图说明
图1是本发明实施例提供的防太阳辐射能的混凝土箱体结构的结构示意图。
附图标记：1、混凝土基体；2、螺旋管路；3、直线管路；4、进液口；5、排气口；6、检测口。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
参见图1，本发明优选实施例中一种防太阳辐射能的混凝土箱体结构及桥梁箱体，包括混凝土基体1和循环管路；
所述混凝土基体1为长方体结构；
所述循环管路包括螺旋管路2和直线管路3，所述螺旋管路2设置混凝土基体1的侧壁内；所述直线管路3的一端连接螺旋管路2的首端，另一端连接螺旋管路2的末端，实现螺旋管路2与直线管路3连接成一个封闭回路；
所述循环管路上设置有进液口4、排气口5和管道调压阀，所述进液口4和排气口5上分别设置有阀门；
所述循环管路内注入有冷却水。
本发明优选实施例的原理是：通过在混凝土基体1内设置循环管道并在循环管道内注入冷却水，循环管道与其周围混凝土基体1结构实质上就形成了一种“热交换器”，冷却水相当于热交换介质；由于水两种物态，即液态和气态都具有较好的流动性，因此在混凝土基体1上不同部位温差不大的条件下，循环管道内不同位置处的冷却水的温度也基本相同。在当混凝土基体1上局部温度出现变化时，对应位置处的混凝土和循环管道内的冷却水之间就会发生热交换，而由于事前设定了循环管道内的气压，水只需要在一定的温度下便可以发生汽化，而水的汽化是一个吸热的过程，它可以把混凝土基体1内温度过高部位的热量吸收，再通过在循环管路内流动把该处热量运送到另一侧温度较低的部位，因为水是流动状态，所以系统是可循环的。从而使箱体结构内温差较小，间接地就对温差应力就 起到了分散和缓解作用，可有效避免基体局部出现较大的温差应力，对结构起到了保护作用。
例如当箱体结构处于在工作状态时，将循环管路内的气压设定为10kpa；而太阳辐射能不可能同时直接照射到箱梁相对的两侧，例如早晨太阳从东边升起时，对应的太阳辐射能所直接照射的是箱梁的东侧，而西侧是没有被直接照射到的，因此箱梁的东侧混凝土温度理论上是要比西侧高的，东侧混凝土的温度达到了水在10kpa的气压下的沸点时，也就是45℃时，对应位置处的混凝土和储液管道内的水之间就会发生热交换，从而使热量从箱体上的高温区转移至低温区，缩小基体上不同位置之间温度差；而在下午至傍晚期间，太阳辐射能直接照射到的就是箱梁的西侧，东侧没有被直接照射到，其反应原理与前面所述一致。
因此，本发明优选实施例的混凝土箱体结构不仅能在混凝土浇筑成型阶段进行降温，还能够解决箱体结构和桥梁箱体在工作运行时受太阳辐射能导致内外温差增大，产生温度应力加剧混凝土裂缝的问题。可以有效降低结构体尤其是大体积混凝土上不同位置处的温差，避免结构体因局部温差应力过大而出现开裂或损坏
本发明优选实施例中，所述循环管路上设置有检测口6，所述检测口6设置有压力计。
具体的，由于水由液相转化为气相时，体积会膨胀，而水加注好后，储液管道又处于封闭状态，因此需要为水的相变考虑压力余量，设置了压力计后，可以在加注水时对储液管道内的压力进行实时监测，以控制水的加注量。
本发明优选实施例中，所述进液口4设置于螺旋管路2的一端。
本发明优选实施例中，所述排气口5设置于螺旋管路2的另一端。
本发明优选实施例中，所述进液口4向垂直于混凝土基体1侧面的方向延伸。
本发明优选实施例中，所述排气口5向垂直于混凝土基体1侧面的方向延伸。
本发明优选实施例中，所述循环管路内的气压为10kPa。
本发明优选实施例中，所述螺旋管路2为方形螺旋管路2。
具体的，由于箱体结构的截面呈矩形，方形螺旋管路2可以更好地适应箱体 结构的截面形状，并且方形螺旋也便于加工和安装。
本发明优选实施例中，所述直线管路3位于所述螺旋管路2的中心轴线上。
具体的，直线管路3从螺旋管路2的中部穿过，可以进一步扩展循环管路与周围结构体的热交换区域。
本发明优选实施例中，包括多个如上述所述的防太阳辐射能的混凝土箱体结构，多个所述混凝土箱体结构的中心轴位于同一水平线上。
值得说明的，可先根据结构体尺寸预制多根管道备用，具体铺设时，在结构体配筋完成后，将多根管道通过接头连接成螺旋状并放置在结构体的钢筋骨架内，然后与钢筋骨架一起浇筑在结构体内。
此外，循环管路里包括以各种气压状态下的水，不同压强下的水的沸点都不一样，可按实际需求，调整储液管道里的气压，使水在不同温度下发生汽化液化，吸热放热。同时也可以用不同的低沸点相变物质代替水。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和替换，这些改进和替换也应视为本发明的保护范围。

Claims (10)

  1. 一种防太阳辐射能的混凝土箱体结构，其特征在于：包括混凝土基体和循环管路；
    所述混凝土基体为长方体结构；
    所述循环管路包括螺旋管路和直线管路，所述螺旋管路设置混凝土基体的侧壁内；所述直线管路的一端连接螺旋管路的首端，另一端连接螺旋管路的末端，实现螺旋管路与直线管路连接成一个封闭回路；
    所述循环管路上设置有进液口、排气口和管道调压阀，所述进液口和排气口上分别设置有阀门；
    所述循环管路内注入有冷却水。
  2. 如权利要求1所述的防太阳辐射能的混凝土箱体结构，其特征在于:所述循环管路上设置有检测口，所述检测口设置有压力计。
  3. 如权利要求1所述的防太阳辐射能的混凝土箱体结构，其特征在于:所述进液口设置于螺旋管路的一端。
  4. 如权利要求3所述的防太阳辐射能的混凝土箱体结构，其特征在于:所述排气口设置于螺旋管路的另一端。
  5. 如权利要求3所述的防太阳辐射能的混凝土箱体结构，其特征在于:所述进液口向垂直于混凝土基体侧面的方向延伸。
  6. 如权利要求4所述的防太阳辐射能的混凝土箱体结构，其特征在于:所述排气口向垂直于混凝土基体侧面的方向延伸。
  7. 如权利要求1所述的防太阳辐射能的混凝土箱体结构及桥梁箱体，其特征在于:所述循环管路内的气压为10kPa。
  8. 如权利要求1所述的防太阳辐射能的混凝土箱体结构及桥梁箱体，其特征在于:所述螺旋管路为方形螺旋管路。
  9. 如权利要求1所述的防太阳辐射能的混凝土箱体结构，其特征在于:所述直线管路位于所述螺旋管路的中心轴线上。
  10. 一种防太阳辐射能的桥梁箱体，其特征在于:包括多个如权利要求1-9任一所述的防太阳辐射能的混凝土箱体结构，多个所述混凝土箱体结构的中心轴位于同一水平线上。
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