A concrete box girder applying refrigerated stirrups

Abstract

The present invention discloses a concrete box girder applying refrigerating stirrups, which comprises a box girder, an evaporation pipe, a water inlet pipe and a water removal assembly. A plurality of steel bars are arranged circumferentially on the box girder; the evaporation pipe is connected around the outside of the plurality of steel bars, and the input end of the evaporation pipe is higher than the output end of the evaporation pipe; the output end of the water inlet pipe is connected to the input end of the evaporation pipe, and a three-way valve is connected to the water inlet pipe; the water removal assembly has a water sealing cavity, the output end of the evaporation pipe is connected to the water sealing cavity through a recovery pipe, the water sealing cavity is connected with a first pipe, the first pipe extends upward and communicates with the input end of the evaporation pipe, the first pipe and the evaporation pipe are combined to tightly connect the steel bars, and a molecular sieve is connected to the lower end of the first pipe. The concrete box girder applying refrigerating stirrups of the present invention cools the structure through the evaporation pipe type stirrups, effectively reduces the temperature difference stress, ensures that the bearing capacity of the box girder meets the requirements, and prolongs the service life.

Description

Technical Field

[0001] The present invention relates to the field of civil engineering technologies, and particularly relates to a concrete box girder applied with refrigerating stirrups. Background Art

[0002] Due to advantages such as large torsional stiffness and uniform internal force distribution, the box structure is widely used in bridge structures; because of the poor heat transfer performance of concrete materials, under the influence of environmental factors such as air temperature or sunlight, the surface temperature of the concrete box structure changes rapidly, while the internal temperature changes slowly, which leads to too large a temperature difference between the inside and outside of the concrete box structure, thereby generating temperature difference stress, causing hazards such as cracking of the structure, reduction of bearing capacity, and shortening of service life, and these hazards become more serious as the size of the box structure increases. The stirrups in the concrete box structure are a kind of steel bars used to meet the shear strength of the inclined section of the structure and connect the stressed main steel bars and the compression zone mixed steel bar skeletons, and play an important role in the structure. Summary of the Invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art. For this reason, the present invention provides a concrete box girder applied with refrigerating stirrups. The concrete box girder applied with refrigerating stirrups cools the structure through evaporative tube stirrups, effectively reduces the temperature difference stress, ensures that the bearing capacity of the box girder meets the requirements, and extends the service life.

[0004] A concrete box girder applied with refrigerating stirrups according to an embodiment of the present invention includes: a box girder, provided with a plurality of steel bars circumferentially; an evaporation tube, connected around the outside of the plurality of steel bars, the input end of the evaporation tube being higher than the output end of the evaporation tube; a water inlet pipe, arranged outside the box girder, the output end of the water inlet pipe being connected to the input end of the evaporation tube, and a three-way valve being connected to the water inlet pipe; a water removal assembly, arranged outside the box girder, the water removal assembly being located below the evaporation tube, the water removal assembly having a water sealing cavity, the output end of the evaporation tube being connected to the water sealing cavity through a recovery pipe, the water sealing cavity being connected to a first pipe, the first pipe extending upward and communicating with the input end of the evaporation tube, the first pipe and the evaporation tube being combined to form stirrups and tightly hooping and connecting the steel bars, a molecular sieve being connected to the lower end of the first pipe, the molecular sieve being used to restrict the passage of water vapor, and the water removal assembly being used to absorb water vapor.

[0005] The above technical solution has at least the following beneficial effects: By combining the first pipeline and the evaporation pipe with a refrigeration function to form a stirrup and tightly connecting it to the steel bars, replacing the traditional steel stirrups, it can cool the overall structure of the box girder, effectively reducing the temperature difference stress; the evaporation pipe mainly refrigerates by the absorption of heat and evaporation of water. Air is extracted from the three-way valve in the evaporation pipe to form a vacuum, and hydrogen is filled into the evaporation pipe. At this time, the partial pressure of water vapor in the evaporation pipe is zero. The water inlet pipe supplies liquid water to the evaporation pipe. Since the partial pressure of water vapor in the evaporation pipe is zero, the liquid water absorbs heat and evaporates. Heat exchange occurs between the evaporation pipe and the inside of the box girder to cool the box girder. The liquid water flows towards the output end of the evaporation pipe and continues to absorb heat and evaporate, continuously cooling the box girder. After the water evaporates, the gas volume in the evaporation pipe expands and the pressure increases, driving the gas to move towards the water seal chamber through the recovery pipe. After the gas reaches the water seal chamber, the water vapor gradually changes from an unsaturated state to a supersaturated state, and the excess water vapor condenses into liquid water in the water seal chamber. The hydrogen then moves upward through the molecular sieve and the first pipeline and enters the evaporation pipe to carry out the next refrigeration cycle, achieving continuous cooling. Using the absorption of heat and evaporation of water to cool the box girder effectively reduces the temperature difference stress, ensures the bearing capacity, and extends the service life.

[0006] According to some embodiments of the present invention, a water-absorbing fiber is provided inside the evaporation pipe.

[0007] According to some embodiments of the present invention, a plurality of evaporation pipes are provided, and the plurality of evaporation pipes are arranged in an array along the length direction of the box girder.

[0008] According to some embodiments of the present invention, the evaporation pipe is provided as a steel pipe.

[0009] According to some embodiments of the present invention, the water removal assembly includes a first water tank and a second water tank. The first water tank is placed inside the second water tank. The second water tank has an upper opening. The second water tank is connected to the input end of the water inlet pipe through a third pipeline, and a first switch valve is connected to the third pipeline. The lower end of the first water tank is provided with a lower opening, and the lower opening communicates with the first water tank and the second water tank. A second switch valve is connected to the lower opening, and a water seal chamber is formed inside the first water tank.

[0010] According to some embodiments of the present invention, a sunshade is provided on the side of the second water tank.

[0011] According to some embodiments of the present invention, a third switch valve is connected to the input end of the water inlet pipe.

[0012] According to some embodiments of the present invention, the water inlet pipe is connected with a U-shaped bend pipe, and the U-shaped bend pipe is located below the water inlet pipe.

[0013] According to some embodiments of the present invention, the concrete box girder further includes a hydrogen production device disposed outside the box girder. The hydrogen production device includes a third water tank, an anode block, a cathode block, a collection hood, and an external DC power supply. A hydrogen production electrolyte is stored in the third water tank. The anode block and the cathode block are spaced apart and disposed in the third water tank. The anode block is connected to the positive pole of the external DC power supply, and the cathode block is connected to the negative pole of the external DC power supply. The collection hood is disposed above the cathode block. The collection hood is connected to the water seal chamber through a second pipeline, and a fourth switch valve is provided on the second pipeline.

[0014] According to some embodiments of the present invention, the external DC power supply is a solar panel.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a cross-sectional view of the concrete box girder in an embodiment of the present invention;

[0018] Figure 2 is a cross-sectional view of the evaporation pipe in an embodiment of the present invention;

[0019] Figure 3 is a schematic structural diagram of the concrete box girder in an embodiment of the present invention.

[0020] Reference Signs:

[0021] Box girder 100, steel bars 110;

[0022] Evaporation pipe 200, recovery pipe 210, water-absorbing fiber 220;

[0023] Water inlet pipe 300, three-way valve 310, third switch valve 320, U-shaped elbow 330;

[0024] Water removal assembly 400, first pipeline 410, molecular sieve 411, first water tank 420, water seal chamber 421, lower opening 422, second switch valve 423, second water tank 430, upper opening 431, third pipeline 432, first switch valve 433, sunshade 434;

[0025] Hydrogen production device 500, third water tank 510, anode block 520, cathode block 530, collection hood 540, external DC power supply 550, second pipeline 560, fourth switch valve 561. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.

[0027] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present invention.

[0028] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more. Understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, words such as "set", "install", "connect", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0030] Refer to Figure 1, an embodiment of the present invention provides a concrete box girder applying a refrigeration stirrup, which includes a box girder 100 for bearing the main body of the bridge. A plurality of steel bars 110 are circumferentially arranged inside the box girder 100. An evaporation pipe 200 is connected to the outside of the plurality of steel bars 110. On the one hand, the evaporation pipe 200 is used to tightly hold the steel bars 110, and on the other hand, it is used for evaporation and heat absorption. The input end of the evaporation pipe 200 is higher than the output end of the evaporation pipe 200, which is convenient for the liquid water to flow by itself to the output end of the evaporation pipe 200. The input end of the evaporation pipe 200 is connected to a water inlet pipe 300. The water inlet pipe 300 is arranged outside the box girder 100 and is used to input liquid water into the evaporation pipe 200. The output end of the water inlet pipe 300 extends into the evaporation pipe 200. A three-way valve 310 is connected to the water inlet pipe 300. The three-way valve 310 is used to extract the air in the evaporation pipe 200 to form a vacuum; the output end of the evaporation pipe 200 is connected to a water removal assembly 400. The water removal assembly 400 is arranged below the box girder 100 and is located below the evaporation pipe 200. The water removal assembly 400 is used to absorb water vapor. Specifically, the water removal assembly 400 includes a first water tank 420 and a second water tank 430. The first water tank 420 is placed inside the second water tank 430. The second water tank 430 has an upper opening 431. The second water tank 430 communicates with the outside, which is convenient for heat exchange with the outside. A lower opening 422 is provided on the lower side wall of the first water tank 420. The lower opening 422 enables the first water tank 420 to communicate with the second water tank 430. A second switching valve 423 is provided on the lower opening 422 to facilitate controlling the water flow rate. The second water tank 430 is connected to the input end of the water inlet pipe 300 through a third pipe 432, and a small amount of liquid water is injected into the second water tank 430 to cover the lower opening 422, so as to form a water seal cavity 421 in the upper part of the first water tank 420. A first switching valve 433 is provided on the third pipe 432 to facilitate controlling the water inlet speed. The upper end of the water seal cavity 421 is connected to the output end of the evaporation pipe 200 through a recovery pipe 210. The upper end of the water seal cavity 421 is also connected to a first pipe 410. The first pipe 410 extends upward and communicates with the input end of the evaporation pipe 200. The lower end of the first pipe 410 and the output end of the evaporation pipe 200 are tied with iron wire, so that the first pipe 410 and the evaporation pipe 200 are combined to form a stirrup and are tightly connected to the steel bar 110. A molecular sieve 411 is connected to the lower end of the first pipe 410. The molecular sieve 411 only allows hydrogen to pass through and restricts the passage of water vapor;The water-sealed chamber 421 is connected to a hydrogen production device 500. The hydrogen production device 500 is arranged on the top of the box girder 100. The hydrogen production device 500 is connected to the water-sealed chamber 421 through a second pipeline 560. The hydrogen production device 500 is used to produce high-purity hydrogen and input it into the evaporation tube 200 to provide a stable hydrogen source. The high-purity hydrogen ensures a good refrigeration effect. Specifically, the hydrogen production device 500 includes a third water tank 510, an anode block 520, a cathode block 530, a collection hood 540, and an external DC power supply 550. The anode block 520 is set as a carbon rod, and the cathode block 530 is set as an iron rod. The third water tank 510 is filled with a hydrogen production electrolyte, and the hydrogen production electrolyte is an unsaturated sodium chloride solution. The carbon rod and the iron rod are arranged at intervals in the third water tank 510 and immersed in the unsaturated sodium chloride solution. The carbon rod is connected to the positive pole of the external DC power supply 550, and the iron rod is connected to the negative pole of the external DC power supply 550. The external DC power supply 550 is set as a solar panel, which is convenient for power generation under field conditions and is energy-saving and environmentally friendly. According to the chemical reaction equation NaCl + H; 2 O == electrolysis == NaClO + H 2 ↑, hydrogen can be produced, and the hydrogen escapes at the iron rod. The collection hood 540 is arranged above the iron rod. The collection hood 540 is used to collect the produced hydrogen. The top of the collection hood 540 is connected to one end of the second pipeline 560, and the other end of the second pipeline 560 is connected to the water-sealed chamber 421, so as to provide a stable hydrogen source for the evaporation tube 200. A fourth on-off valve 561 is arranged on the second pipeline 560 to facilitate the control of the hydrogen flow rate.

[0031] By combining the first pipe 410 and the evaporation pipe 200 with a refrigerating effect to form stirrups and tightly connecting them to the steel bars 110, replacing the traditional steel stirrups, the overall structure of the box girder 100 can be cooled, effectively reducing the temperature difference stress. The evaporation pipe 200 mainly refrigerates by water absorbing heat and evaporating. Air in the evaporation pipe 200 is extracted from the three-way valve 310 to form a vacuum, and hydrogen is produced by the hydrogen production device 500 and filled into the evaporation pipe 200. At this time, the partial pressure of water vapor in the evaporation pipe 200 is zero. The water inlet pipe 300 supplies liquid water into the evaporation pipe 200. Since the partial pressure of water vapor in the evaporation pipe 200 is zero, the liquid water absorbs heat and evaporates. Heat exchange occurs between the evaporation pipe 200 and the inside of the box girder 100 to cool the box girder 100. The liquid water flows towards the output end of the evaporation pipe 200 and continues to absorb heat and evaporate, continuously cooling the box girder 100. After the water evaporates, the gas volume in the evaporation pipe 200 expands and the pressure increases, driving the gas to move towards the water seal cavity 421 through the recovery pipe 210. After the gas reaches the water seal cavity 421, the water vapor gradually changes from an unsaturated state to a supersaturated state, and the excess water vapor condenses into liquid water in the water seal cavity 421. The hydrogen then moves upward through the molecular sieve 411 and the first pipe 410 and enters the evaporation pipe 200 to carry out the next refrigeration cycle, realizing continuous cooling. Using the water in the evaporation pipe 200 to absorb heat and evaporate to cool the box girder 100 can effectively reduce the temperature difference stress, ensure the bearing capacity, and extend the service life.

[0032] Refer to Figure 2 Furthermore, a water-absorbing fiber 220 is arranged at the lower part of the evaporation pipe 200. From the cross-sectional view of the evaporation pipe 200, the water-absorbing fiber 220, liquid water, and hydrogen are arranged in sequence from bottom to top in the evaporation pipe 200. The water-absorbing fiber 220 can effectively slow down the flow rate of the liquid water, enabling the liquid water in the evaporation pipe 200 to fully absorb heat and evaporate, and the evaporation pipe 200 can fully exchange heat with the structure of the box girder 100 to ensure the cooling effect.

[0033] Refer to Figure 3 Furthermore, multiple evaporation pipes 200 are provided, and the multiple evaporation pipes 200 are arranged in an array along the length direction of the box girder 100. The input ends of the multiple evaporation pipes 200 are simultaneously connected to the output end of the water inlet pipe 300, that is, the multiple evaporation pipes 200 share one water inlet pipe 300. The output ends of the multiple evaporation pipes 200 are simultaneously connected to one recovery pipe 210, that is, they share the recovery pipe 210. Correspondingly, the number of the first pipes 410 is the same as that of the evaporation pipes 200. The multiple first pipes 410 are connected to the water seal cavity 421 through a shared pipe. Each first pipe 410 and each evaporation pipe 200 form stirrups and are tightly connected to the steel bars 110. The multiple groups of stirrups can, on the one hand, improve the structural strength of the box girder 100, and on the other hand, make the overall cooling of the box girder 100 uniform, further reducing the temperature difference stress, ensuring the bearing capacity, and extending the service life.

[0034] Furthermore, the evaporation pipe 200 is a steel pipe. On the one hand, the steel pipe has good heat transfer performance, which facilitates the heat exchange between the evaporation pipe 200 and the box girder 100 to ensure the cooling effect. On the other hand, compared with traditional steel stirrups, using steel pipes can save steel and reduce the self-weight of the box girder 100 structure.

[0035] Refer to Figure 1 , furthermore, a sunshade 434 is provided on the side of the second water tank 430 to prevent direct sunlight and avoid the water temperature in the second water tank 430440 from being too high, which affects the water cooling effect.

[0036] Refer to Figure 1 , furthermore, a third switch valve 320 is connected to the input end of the water inlet pipe 300 to facilitate controlling the water inlet speed of the evaporation pipe 200. At the same time, the third switch valve 320 cooperates with the second switch valve 423 to form a closed loop space in the evaporation pipe 200. Before installation, the third switch valve 320 and the second switch valve 423 can be closed to facilitate pumping air out of the evaporation pipe 200 from the three-way valve 310 to form a vacuum.

[0037] Refer to Figure 1 , furthermore, the water inlet pipe 300 is connected with a U-shaped bend pipe 330. The U-shaped bend pipe 330 is located below the water inlet pipe 300, and liquid water accumulates in the U-shaped bend pipe 330 to form a water seal, which can prevent hydrogen in the evaporation pipe 200 from escaping.

[0038] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art in the said technical field, various changes can be made without departing from the purpose of the present invention.

Claims

1. A concrete box girder applying refrigeration stirrups, characterized in that, it includes: A box girder (100) with a plurality of steel bars (110) arranged circumferentially; Evaporation pipes (200) are connected around the outside of the plurality of steel bars (110). The input end of the evaporation pipe (200) is higher than the output end of the evaporation pipe (200). Absorbent fibers (220) are arranged in the evaporation pipe (200), and a plurality of evaporation pipes (200) are provided. The plurality of evaporation pipes (200) are arranged in an array along the length direction of the box girder (100); A water inlet pipe (300) is arranged outside the box girder (100). The output end of the water inlet pipe (300) is connected to the input end of the evaporation pipe (200), and a three-way valve (310) is connected to the water inlet pipe (300); A water removal component (400) is arranged outside the box girder (100). The water removal component (400) is located below the evaporation pipe (200). The water removal component (400) has a water seal cavity (421). The output end of the evaporation pipe (200) is connected to the water seal cavity (421) through a recovery pipe (210). The water seal cavity (421) is connected to a first pipe (410). The first pipe (410) extends upward and communicates with the input end of the evaporation pipe (200). The first pipe (410) and the evaporation pipe (200) form a stirrup and tightly hoop and connect the steel bars (110). A molecular sieve (411) is connected to the lower end of the first pipe (410). The molecular sieve (411) is used to restrict the passage of water vapor, and the water removal component (400) is used to absorb water vapor.

2. The concrete box girder applying refrigeration stirrups according to claim 1, characterized in that: The evaporation pipe (200) is made of steel pipe.

3. The concrete box girder applying refrigeration stirrups according to claim 1, characterized in that: The water removal component (400) includes a first water tank (420) and a second water tank (430). The first water tank (420) is placed in the second water tank (430). The second water tank (430) has an upper opening (431). The second water tank (430) is connected to the input end of the water inlet pipe (300) through a third pipe (432). A first switch valve (433) is connected to the third pipe (432). A lower opening (422) is provided at the lower end of the first water tank (420). The lower opening (422) communicates with the first water tank (420) and the second water tank (430). A second switch valve (423) is connected to the lower opening (422). A water seal cavity (421) is formed in the first water tank (420).

4. The concrete box girder applying refrigeration stirrups according to claim 3, characterized in that: A sunshade (434) is arranged on the side of the second water tank (430).

5. The concrete box girder applying refrigeration stirrups according to claim 1, characterized in that: A third switch valve (320) is connected to the input end of the water inlet pipe (300).

6. A concrete box girder applying refrigerated stirrups according to claim 1, characterized in that: The water inlet pipe (300) is connected with a U-shaped elbow pipe (330), and the U-shaped elbow pipe (330) is located below the water inlet pipe (300).

7. A concrete box girder applying refrigerated stirrups according to claim 1, characterized in that: The concrete box girder further includes a hydrogen production device (500). The hydrogen production device (500) is arranged outside the box girder (100). The hydrogen production device (500) includes a third water tank (510), an anode block (520), a cathode block (530), a collection hood (540) and an external DC power supply (550). Hydrogen production electrolyte is stored in the third water tank (510). The anode block (520) and the cathode block (530) are arranged at intervals in the third water tank (510). The anode block (520) is connected to the positive pole of the external DC power supply (550), and the cathode block (530) is connected to the negative pole of the external DC power supply (550). The collection hood (540) is arranged above the cathode block (530). The collection hood (540) is connected to the water seal cavity (421) through a second pipeline (560), and a fourth on-off valve (561) is arranged on the second pipeline (560).

8. A concrete box girder applying refrigerated stirrups according to claim 7, characterized in that: The external DC power supply (550) is a solar panel.

Images