US20220034051A1

US20220034051A1 - Concrete box beam using refrigeration stirrup

Info

Publication number: US20220034051A1
Application number: US17/321,966
Authority: US
Inventors: Min Wu
Original assignee: Wuyi University
Current assignee: Wuyi University
Priority date: 2020-07-29
Filing date: 2021-05-17
Publication date: 2022-02-03
Also published as: CN111794073A

Abstract

Disclosed is a concrete box beam using a refrigeration stirrup, which may include a box beam, an evaporation pipe, a water inlet pipe, and a water removal assembly; the box beam is provided with a plurality of steel bars in a circumferential direction; the n evaporation pipe surrounds and is connected to an outer side of the plurality of steel bars and an input end of the evaporation pipe is higher than an output end of the evaporation pipe; an output end of the water inlet pipe is connected to the input end of the evaporation pipe, and the water inlet pipe is connected to a three-way valve; and the water removal assembly includes a water sealing cavity, the output end of the evaporation pipe is connected to the water sealing cavity by means of a recovery pipe, the water sealing cavity is connected to a first pipeline.

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese patent application No. 202010745153.4, filed Jul. 29, 2020. The content of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the technical field of civil engineering, and more particularly, to a concrete box beam using a refrigeration stirrup.

BACKGROUND

Box structures are widely used in bridge structures due to advantages such as large torsional stiffness and uniform internal force distribution. Since a heat conduction performance of a concrete material is weak, under the influences of environment factors such as the temperature or sunlight, for a concrete box structure, the surface temperature of the structure changes rapidly while the internal temperature of the structure changes slowly, which would cause an excessive temperature difference between the surface and the inner part of the concrete box structure, to generate a differential temperature stress, so that damages such as cracking, reduced bearing capacity, and shortened service life would occur to the structure; moreover, these damages would become worse as the increasing of the size of the box structure. A stirrup in the concrete box structure is a steel bar for meeting a shear strength of an oblique section of the structure and linking weighted main bar and compressive zone mixed bar frameworks, and plays an important role in the structure.

SUMMARY

The present disclosure aims at solving at least one of technical problems existing in the prior art. With this regard, the present disclosure provides a concrete box beam using a refrigeration stirrup; the concrete box beam using a refrigeration stirrup lowers the temperature of the structure by means of an evaporation pipe type stirrup, effectively reduces a differential temperature stress, ensures that a carrying capacity of the box beam meets requirements, and extends a service life.
A concrete box beam using a refrigeration stirrup according an embodiment of the present disclosure includes a box beam provided with a plurality of steel bars in a circumferential direction; an evaporation pipe surrounding and connected to an outer side of the plurality of steel bars, an input end of the evaporation pipe being higher than an output end of the evaporation pipe; a water inlet pipe disposed at an outer side of the box beam, an output end of the water inlet pipe being connected to the input end of the evaporation pipe, and the water inlet pipe being connected to a three-way valve; and a water removal assembly disposed at an outer part of the box beam, located below the evaporation pipe and having a water sealing cavity, the output end of the evaporation pipe being connected to the water sealing cavity by means of a recovery pipe, the water sealing cavity being connected to a first pipeline, the first pipeline extending upwards and being communicated with the input end of the evaporation pipe, the first pipeline being combined with the evaporation pipe to form a stirrup to be hooped and connected to the steel bars; a lower end of the first pipeline being connected to a molecular sieve, the molecular sieve being used for limiting water vapor from passing through, and the water removal assembly being used for absorbing the water vapor.
The technical solution above at least has the following beneficial effects: combining the first pipeline with the evaporation pipe having a refrigeration function to form a stirrup to be hooped and connected to the steel bars to replace a conventional steel stirrup may lower the temperature of the entire structure of the box beam, and effectively reduce the differential temperature; the refrigeration of the evaporation pipe is mainly achieved by means of water heat absorption and evaporation; air in the evaporation pipe is extracted from the three-way valve to form vacuum and hydrogen is filled into the evaporation pipe; at this time, a partial pressure of the water vapor in the evaporation pipe is zero, and the water inlet pipe provides liquid water into the evaporation pipe; the partial pressure of the water vapor in the evaporation pipe is zero, and therefore, the liquid water absorbs heat to be evaporated and exchanges heat with an inner part of the box beam by means of the evaporation pipe, so as to lower the temperature of the box beam. The liquid water flows towards the output end of the evaporation pipe while continuously absorbing heat for evaporation to continue lowering the temperature of the box beam. After the water is evaporated, the volume of gas in the evaporation pipe is expanded, and the pressure is increased, driving the gas to move towards the water sealing cavity by means of the recovery pipe; after the gas reaches the water sealing cavity, the water vapor gradually trends from a unsaturated state to a supersaturated state; redundant water vapor is condensed into liquid water in the water sealing cavity; hydrogen then moves upwards by means of the molecular sieve and the first pipeline and enters the evaporation pipe for executing a next refrigeration circulation, implementing continuous lowering of the temperature; the temperature of the box beam is lowered using water for heat absorption and evaporation, effectively reducing the differential temperature stress, ensuring the carrying capacity, and extending the service life.
According to some embodiments of the present disclosure, a water absorption fiber is disposed in the evaporation pipe.
According to some embodiments of the present disclosure, a plurality of evaporation pipes are provided, and the plurality of evaporation pipes are arranged in array along a length direction of the box beam.
According to some embodiments of the present disclosure, the evaporation pipe is provided as a steel pipe.
According to some embodiments of the present disclosure, the water removal assembly includes a first water tank and a second water tank, the first water tank is placed in 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 by means of a third pipeline, the third pipeline is connected to a first switch valve, a lower end of the first water tank is provided with a lower opening, the lower opening communicates the first water tank with the second water tank, the lower opening is connected to a second switch valve, and a water sealing cavity is formed in the first water tank.
According to some embodiments of the present disclosure, a side of the second water tank is provided with a sun shield.
According to some embodiments of the present disclosure, an input end of the water inlet pipe is connected to a third switch valve.
According to some embodiments of the present disclosure, the water inlet pipe is connected to a U-shaped bent pipe, and the U-shaped bent pipe is located at a lower side of the water inlet pipe.
According to some embodiments of the present disclosure, the concrete box beam using a refrigeration stirrup further includes a hydrogen production means; the hydrogen production means is disposed at an outer part of the box beam and includes a third water tank, an anode block, a cathode block, a collection cover, and an external direct current power source; the third water tank stores a hydrogen production electrolyte; the anode block and the cathode block are disposed in the third water tank at interval; the anode block is connected to a positive pole of the external direct current power source; the cathode block is connected to a negative pole of the external direct current power source; the collection cover covers above the cathode block; the collection cover is connected to the water sealing cavity by means of a second pipeline; and the second pipeline is provided with a fourth switch valve.
According to some embodiments of the present disclosure, the external direct current power source is a solar panel.
Additional aspects and advantages of the present disclosure will be given in the following description, some of which will become apparent from the following description or may be learned from practices of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and comprehensible in the description of embodiments made with reference to the following accompanying drawings, where:

FIG. 1 is a sectional view of a concrete box beam in an embodiment of the present disclosure;

FIG. 2 is a sectional view of an evaporation pipe in an embodiment of the present disclosure; and

FIG. 3 is a schematic structural diagram of a concrete box beam according to an embodiment of the present disclosure.

REFERENCE NUMERALS

a box beam 100; steel bars 110; evaporation pipe 200; recovery pipe 210; water absorption fiber 220; water inlet pipe 300; three-way valve 310; third switch valve 320; U-shaped bent pipe 330; water removal assembly 400; first pipeline 410; molecular sieve 411; first water tank 420; water sealing cavity 421; lower opening 422; second switch valve 423; second water tank 430; upper opening 431; third pipeline 432; first switch valve 433; sun shield 434; hydrogen production means 500; third water tank 510; anode block 520; cathode block 530; collection cover 540; external direct current power source 550; second pipeline 560; fourth switch valve 561.

DETAILED DESCRIPTION

This part would describe specific embodiments of the present disclosure in detail; preferable embodiments of the present disclosure would be shown in the accompanying drawings; the function of the accompanying drawings is using drawings to supplement the description in the text of the description, so that each technical feature and the entire technical solution of the present disclosure can be visually and figuratively understood by people, but they cannot be understood as limitation to the scope of protection of the present disclosure.
In the description of the present disclosure, it should be understood that, for orientation descriptions, orientations or position relationships indicated by terms such as up, down, front, rear, left, and right, are orientations or position relationships shown based on the accompanying drawings, and are used only for ease of describing the present disclosure and simplifying the description, rather than indicating or implying that the apparatus or element should have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be construed as a limitation on the present disclosure.
In the description of the present disclosure, the meaning of multiple is one or more, and the meaning of a plurality is more than two; greater than, less than, exceeding and the like are understood as not including the number itself, and more than, smaller than, within, and the like are understood as including the number itself. The description of first and second are used merely for the purpose of distinguishing the technical features, and shall not be understood as indicating or implying relative importance or implying a quantity of indicated technical features or implying a precedence relationship of the indicated technical features.
In the description of the present disclosure, unless otherwise explicitly defined, words such as setting, mounting, and connecting should be widely understood; a person skilled in the art can reasonably determine the specific meanings of said words in the present disclosure by combining specific contents of the technical solution.
Referring to FIG. 1, the embodiment of the present disclosure provides a concrete box beam using a refrigeration stirrup, including a box beam 100 for carrying a bridge body; the box beam 100 is provided with a plurality of steel bars 110 in a circumferential direction; an evaporation pipe 200 surrounds and is connected to an outer side of the plurality of steel bars 110; the evaporation pipe 200 is used for hooping the steel bars 110 on one hand and is used for evaporation and heat absorption on the other hand; an input end of the evaporation pipe 200 is higher than an output end of the evaporation pipe 200, for facilitating liquid water to automatically flow towards the output end of the evaporation pipe 200; an input end of the evaporation pipe 200 is connected to a water inlet pipe 300; the water inlet pipe 300 is disposed at an outer part of the ceiling 100 and is used for inputting the liquid water into the evaporation pipe 200; the output end of the water inlet pipe 300 is inserted into the evaporation pipe 200; the water inlet pipe 300 is connected to a three-way valve 310; the three-way valve 310 is used for extracting air in the evaporation pipe 200 to form vacuum; the output end of the evaporation pipe 200 is connected to a water removal assembly 400 disposed below the box beam 100 and located below the evaporation pipe 200; the water removal assembly 400 is used for absorbing 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 in the second water tank 430; the second water tank 430 has an upper opening 431; the second water tank 430 is communicated with outside, to facilitate heat exchange with the outside; a lower opening 422 is disposed on a lower end sidewall of the first water tank 420; the lower opening 422 communicates the first water tank 420 and the second water tank 430; the lower opening 422 is provided with a second switch valve 423 to facilitate controlling the flow rate of water; the second water tank 430 is connected to the input end of the water inlet pipe 300 by means of a third pipeline 432 and injects a small amount of liquid water into the second water tank 430 to cover the lower opening 422, so that a water sealing cavity 421 is formed at an upper part of the first water tank 420; the third pipeline 432 is provided with a first switch valve 433 to facilitate controlling the flow rate of the water; the upper end of the water sealing cavity 421 is connected to the output end of the evaporation pipe 200 by means of a recovery pipe 210; the upper end of the water sealing cavity 421 is further connected with a first pipeline 410; the first pipeline 410 extends upwards and is communicated with the input end of the evaporation pipe 200; a lower end of the first pipeline 410 is bound to the output end of the evaporation pipe 200 by means of an iron wire so that the first pipeline 410 is combined with the evaporation pipe 200 to form a stirrup to be hooped and connected to the steel bars 110; the lower end of the first pipeline 410 is connected to a molecular sieve 411; the molecular sieve 411 only allows hydrogen to pass through and limits water vapor from passing through; the water sealing cavity 421 is connected to a hydrogen production means 500; the hydrogen production means 500 is disposed at the top of the box beam 100; the hydrogen production means 500 is connected to the water sealing cavity 421 by means of a second pipeline 560; the hydrogen production means 500 is used for producing hydrogen with high purity and inputting into the evaporation pipe 200, so as to provide a stable hydrogen source; the hydrogen with high purity ensures a good refrigeration effect; specifically, the hydrogen production means 500 includes a third water tank 510, an anode block 520, a cathode block 530, a collection cover 540, and an external direct current power source 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 stores a hydrogen production electrolyte; the hydrogen production electrolyte is a unsaturated sodium chloride solution; the carbon rod and the iron rod are disposed in the third water tank 510 at interval and are immersed in the unsaturated sodium chloride solution; the carbon rod is connected to a positive pole of the external direct current power source 550; the iron rod is connected to a negative pole of the external direct current power source 550; the external direct current power source 550 is set as a solar panel, for facilitating charging in the field, saving energy, and being environmentally friendly; according to a chemical reaction equation NaCl+H₂O==charging==NaClO+H₂↑, hydrogen can be produced; moreover, hydrogen escapes at the iron rod; the collection cover 540 covers above the iron rod for collecting produced hydrogen; the top of the collection cover 540 is connected to an end of the second pipeline 560 and the other end of the second pipeline 560 is connected to the water sealing cavity 421, so as to provide a stable hydrogen source into the evaporation pipe 200; and the second pipeline 560 is provided with a fourth switch valve 561 for controlling the flow rate of hydrogen.
Combining the first pipeline 410 with the evaporation pipe 200 having a refrigeration function to form a stirrup to be hooped and connected to the steel bars 110 to replace a conventional steel stirrup may lower the temperature of the entire structure of the box beam 100, and effectively reduce the differential temperature; the refrigeration of the evaporation pipe 200 is mainly achieved by means of water heat absorption and evaporation; air in the evaporation pipe 200 is extracted from the three-way valve 310 to form vacuum and hydrogen is produced by the hydrogen production means 500 and is filled into the evaporation pipe 200; at this time, a partial pressure of the water vapor in the evaporation pipe 200 is zero, and the water inlet pipe 300 provides liquid water into the evaporation pipe 200; the partial pressure of the water vapor in the evaporation pipe 200 is zero, and therefore, the liquid water absorbs heat to be evaporated and exchanges heat with an inner part of the box beam 100 by means of the evaporation pipe 200, so as to lower the temperature of the box beam 100. The liquid water flows towards the output end of the evaporation pipe 200 while continuously absorbing heat for evaporation to continue lowering the temperature of the box beam 100. After the water is evaporated, the volume of gas in the evaporation pipe 200 is expanded, and the pressure is increased, driving the gas to move towards the water sealing cavity 421 by means of the recovery pipe 210; after the gas reaches the water sealing cavity 421, the water vapor gradually trends from a unsaturated state to a supersaturated state; redundant water vapor is condensed into liquid water in the water sealing cavity 421; hydrogen then moves upwards by means of the molecular sieve 411 and the first pipeline 410 and enters the evaporation pipe 200 for executing a next refrigeration circulation, implementing continuous lowering of the temperature; the temperature of the box beam 100 is lowered using water for heat absorption and evaporation in the evaporation pipe 200, effectively reducing the differential temperature stress, ensuring the carrying capacity, and extending the service life.
Referring to FIG. 2, furthermore, a water absorption fiber 220 is disposed in the evaporation pipe 200. As can be seen from the sectional view of the evaporation pipe 200, the evaporation pipe 200 successively has the water absorption fiber 220, liquid water, and hydrogen from bottom to top; the water absorption fiber 220 may effectively lower the flow rate of the liquid water so that the liquid water in the evaporation pipe 200 can fully absorb heat to be evaporated and the evaporation pipe 200 can fully exchange heat with the box beam 100 structure, to ensure the temperature lowering effect.
Referring to FIG. 3, furthermore, a plurality of evaporation pipes 200 are provided, and the plurality of evaporation pipes 200 are arranged in array along a length direction of the box beam 100. Input ends of the plurality of evaporation pipes 200 are connected to the output end of the water inlet pipe 300 at the same time, i.e., the plurality of evaporation pipes 200 share one water inlet pipe 300; output ends of the plurality of evaporation pipes 200 are connected to one recovery pipe 210 at the same time, i.e., sharing the recovery pipe 210; accordingly, the number of the first pipelines 410 is the same as that of the evaporation pipes 200; a plurality of first pipelines 410 are connected to the water sealing cavity 421 by means of one sharing pipe; each first pipeline 410 is combined with each evaporation pipe 200 to form a stirrup to be hooped and connected to the steel bars 110; multiple sets of stirrups improve the structural strength of the box beam 100 on one hand and evenly lower the temperature of the entire box beam 100 on the other hand, thereby further reducing the differential temperature stress, ensuring the carrying capacity, and extending the service life.
Furthermore, the evaporation pipe 200 is provided as a steel pipe. On one hand, the steel pipe has a good heat conduction performance, facilitating heat exchange between the evaporation pipe 200 and the box beam 100, and ensuring the temperature lowering effect; on the other hand, with respect to a conventional steel stirrup, using a steel pipe may save a steel material and lighten a dead-weight of the box beam 100 structure.
Referring to FIG. 1, furthermore, a side of the second water tank 430 is provided with a sun shield 434 to avoid direct solar radiation and to prevent influencing the temperature lowering effect of water due to an excessive high water temperature in the second water tank 430440.
Referring to FIG. 1, furthermore, the input end of the water inlet pipe 300 is connected to the third switch valve 320, facilitating controlling inlet water speed of the evaporation pipe 200; meanwhile, the third switch valve 320 cooperates with the second switch valve 423, so as to form a sealing ring space in the evaporation pipe 200; the third switch valve 320 and the second switch valve 423 may be turned off before mounting, so as to facilitate extraction of air in the evaporation pipe 200 from the three-way valve 310 to form vacuum.
Referring to FIG. 1, furthermore, the water inlet pipe 300 is connected to a U-shaped bent pipe 330, and the U-shaped bent pipe 330 is located at a lower side of the water inlet pipe 300. The U-shaped bent pipe 330 is deposited with the liquid water to form water sealing, which can prevent hydrogen in the evaporation pipe 200 from escaping.
The embodiments of the present disclosure are explained in detail by combining the accompanying drawings above; however, the present disclosure is not limited to the embodiments above; within the range of knowledge mastered by a person of ordinary skill in the art, various changes may be made under the premise of not departing from purposes of the present disclosure.

Claims

We claim:

1. A concrete box beam using a refrigeration stirrup, comprising:

a box beam provided with a plurality of steel bars in a circumferential direction;

an evaporation pipe surrounding and connected to an outer side of the plurality of steel bars, an input end of the evaporation pipe being higher than an output end of the evaporation pipe;

a water inlet pipe disposed at an outer side of the box beam, an output end of the water inlet pipe being connected to the input end of the evaporation pipe, and the water inlet pipe being connected to a three-way valve; and

a water removal assembly disposed at an outer part of the box beam, located below the evaporation pipe and having a water sealing cavity, the output end of the evaporation pipe being connected to the water sealing cavity by means of a recovery pipe, the water sealing cavity being connected to a first pipeline, the first pipeline extending upwards and being communicated with the input end of the evaporation pipe, the first pipeline being combined with the evaporation pipe to form a stirrup to be hooped and connected to the steel bars; a lower end of the first pipeline being connected to a molecular sieve, the molecular sieve being used for limiting water vapor from passing through, and the water removal assembly being used for absorbing the water vapor.

2. The concrete box beam of claim 1, wherein a water absorption fiber is disposed in the evaporation pipe.

3. The concrete box beam of claim 1, wherein a plurality of evaporation pipes are provided, and the plurality of evaporation pipes are arranged in array along a length direction of the box beam.

4. The concrete box beam of claim 1, wherein the evaporation pipe is provided as a steel pipe.

5. The concrete box beam of claim 1, wherein the water removal assembly comprises a first water tank and a second water tank, the first water tank is placed in 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 by means of a third pipeline, the third pipeline is connected to a first switch valve, a lower end of the first water tank is provided with a lower opening, the lower opening communicates the first water tank with the second water tank, the lower opening is connected to a second switch valve, and a water sealing cavity is formed in the first water tank.

6. The concrete box beam of claim 5, wherein a side of the second water tank is provided with a sun shield.

7. The concrete box beam of claim 1, wherein an input end of the water inlet pipe is connected to a third switch valve.

8. The concrete box beam of claim 1, wherein the water inlet pipe is connected to a U-shaped bent pipe, and the U-shaped bent pipe is located at a lower side of the water inlet pipe.

9. The concrete box beam of claim 1, wherein the concrete box beam further comprises a hydrogen production means; the hydrogen production means is disposed at an outer part of the box beam and comprises a third water tank, an anode block, a cathode block, a collection cover, and an external direct current power source; the third water tank stores a hydrogen production electrolyte; the anode block and the cathode block are disposed in the third water tank at interval; the anode block is connected to a positive pole of the external direct current power source; the cathode block is connected to a negative pole of the external direct current power source; the collection cover covers above the cathode block; the collection cover is connected to the water sealing cavity by means of a second pipeline; and the second pipeline is provided with a fourth switch valve.

10. The concrete box beam of claim 9, wherein the external direct current power source is a solar panel.