Concrete curing device for suspended casting box girder

Abstract

The utility model discloses a suspended pouring box girder concrete curing device which comprises a heat preservation mechanism, a conveying mechanism and a control mechanism, the heat preservation mechanism comprises a support fixed on a bridge floor and a warm shed erected on the support, and the warm shed and the upper end face of a suspended pouring box girder define a closed space; the conveying mechanism comprises an internal conveying pipe penetrating through an internal mold of the suspended pouring box girder, an external conveying pipe arranged on a bridge floor, a supply part used for providing spraying water and / or steam for the internal conveying pipe and the external conveying pipe, and an adjusting part used for adjusting the flow of the spraying water and / or steam output by the internal conveying pipe and / or the external conveying pipe. The control mechanism comprises a temperature measuring device used for monitoring the temperature of the suspended pouring box girder, a controller used for controlling adjustment of the adjusting piece and a timer used for controlling the supply piece to be started and stopped at fixed time, and the controller is electrically connected with the temperature measuring device. The device can realize automatic maintenance of the suspended pouring box girder, is good in maintenance effect and high in efficiency, and ensures the quality of the suspended pouring box girder.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction and maintenance, in particular to a cantilever cast box beam concrete maintenance device. Background Art

[0002] In recent years, with the rapid development of infrastructure such as expressways and municipal engineering in my country, cantilever bridges have begun to develop rapidly and be widely used. As an important direct load-bearing component, the maintenance effect of cantilevered concrete box girders has become a key factor affecting the quality and progress of the project.

[0003] The two major factors that determine the maintenance effect of cast-in-place concrete box girders are temperature and humidity. However, during winter construction, the low ambient temperature has a greater impact on the maintenance and quality of the entire construction. If the maintenance measures are not in place, the hydration of cement will be hindered by the low temperature, and the free water in the concrete will begin to freeze and increase in volume, which will easily cause the concrete to crack, seriously affecting the construction quality. In addition, the northern region of my country has a high altitude, a dry climate, and strong winds all year round. The concrete in the dry environment shrinks more rapidly, and shrinkage cracks are prone to appear on the surface. At the same time, the construction period of the box girder is long. If the maintenance is not good, cracks will easily appear on the surface of the box girder. Therefore, winter construction is particularly critical for the maintenance of the box girder.

[0004] At present, steam curing is usually used for the maintenance of box girders during winter construction. Steam curing is a method of curing concrete cantilever box girders using steam generated by a steam engine. The steam engine is turned on to introduce steam into the cantilever box girder, and the steam is used to make the concrete of the cantilever box girder reach the required curing temperature and humidity, thereby achieving the curing of the concrete cantilever box girder. However, during the curing process, if the temperature and steam humidity are insufficient or excessive, the curing effect will be poor. Therefore, manual inspection and switching of the steam engine at any time to control the temperature and humidity of the steam are required at the curing site. However, this operation is relatively cumbersome and labor-intensive, and requires high manpower investment. Utility Model Content

[0005] The utility model provides a cantilever cast box girder concrete curing device to solve the technical problem in the prior art that curing conditions for cantilever cast box girders constructed in winter are difficult to control, resulting in poor curing effects.

[0006] According to one aspect of the present invention, a cantilevered box girder concrete curing device is provided, comprising: a heat preservation mechanism, comprising a bracket fixed on a bridge deck and a warming shed erected on the bracket, the warming shed and the upper end surface of the cantilevered box girder enclosing to form a closed space;

[0007] The conveying mechanism includes an internal conveying pipe passing through the inner mold of the cantilevered box girder, an external conveying pipe arranged on the bridge deck, a supply member for supplying spray water and / or steam to the internal conveying pipe and the external conveying pipe, and a regulating member for regulating the flow rate of the spray water and / or steam output by the internal conveying pipe and / or the external conveying pipe;

[0008] The control mechanism includes a temperature detector for monitoring the temperature of the cantilevered box girder, a controller for controlling the adjustment of the adjustment member, and a timer for controlling the timing opening and closing of the supply member. The controller is electrically connected to the temperature detector.

[0009] Furthermore, the brackets are symmetrically arranged along the length direction of the bridge deck, and the height of the brackets gradually decreases from the center point of the bridge deck toward both sides of the bridge deck along the width direction of the bridge deck;

[0010] The greenhouse comprises a supporting grid fixed to the upper end of a bracket and a tarpaulin covering the supporting grid, wherein the tarpaulin is provided with openable heat dissipation holes.

[0011] Furthermore, a solar panel is provided on the tarpaulin, and the solar panel is electrically connected to the conveying mechanism and / or the control mechanism for providing electrical energy.

[0012] Furthermore, the internal conveying pipe is arranged in the middle of the cantilever box girder along the length direction of the cantilever box girder, and support rods for support are set at the bottom of the cantilever box girder. The support rods are symmetrically arranged on both sides of the inner mold of the cantilever box girder and are cross-arranged.

[0013] Furthermore, the external transport pipe includes a first deck main pipe arranged on both sides of the bridge deck along the length direction of the bridge deck, a second deck main pipe arranged in the middle of the bridge deck, and a deck branch pipe arranged between the first deck main pipe and the second deck main pipe along the width direction of the bridge deck. A plurality of deck branch pipes are provided along the length direction of the first deck main pipe, and the first deck main pipe is connected to the deck branch pipes.

[0014] The first bridge deck main pipe and / or the second bridge deck main pipe are in communication with the supply member.

[0015] Furthermore, the regulating member includes regulating valves installed at the connection between the first deck main pipe and the deck branch pipe, the connection between the supply member and the first deck main pipe, the connection between the supply member and the second deck main pipe, and the connection between the supply member and the internal delivery pipe.

[0016] Furthermore, a pad is provided at the bottom of the first deck main pipe, which is used to support the first deck main pipe on the upper end surface of the bridge deck so as to be located on the same horizontal plane as the second deck main pipe and the deck branch pipe.

[0017] Furthermore, the ends of the internal delivery pipe, the first bridge deck main pipe, the bridge deck branch pipe and the second bridge deck main pipe are closed, and a number of steam injection holes are opened along the length direction of the internal delivery pipe, the first bridge deck main pipe, the bridge deck branch pipe and the second bridge deck main pipe, and nozzles are detachably installed on the steam injection holes.

[0018] Furthermore, the control mechanism also includes a humidity sensor for monitoring the humidity of the cantilevered box girder. The humidity sensor is arranged on the cantilevered box girder and is electrically connected to the adjusting member.

[0019] Furthermore, the conveying mechanism further comprises a blower, which is arranged on both sides of the upper end of the bridge deck and / or the inner mold of the cantilevered box girder and is electrically connected to the solar panel;

[0020] A plurality of blowers are arranged at intervals along the length direction of the cantilevered box girder, and are used to evenly distribute the spray water and / or steam delivered by the conveying mechanism to the cantilevered box girder.

[0021] The utility model has the following beneficial effects:

[0022] The utility model discloses a cantilevered box girder concrete curing device, the heat preservation mechanism is set up by setting up a bracket on the bridge deck to cover the top of the cantilevered box girder with a warm shed and enclose the cantilevered box girder to form a closed space, so as to wrap the cantilevered box girder in the warm shed, isolate the cantilevered box girder from the external environment, prevent the temperature and humidity of the cantilevered box girder from being lost during curing, ensure the curing effect, and avoid the influence of the external cold air on the quality of the box girder during winter construction. Preferably, the heat preservation mechanism also includes a heat preservation layer sprayed on the surface of the outer formwork of the cantilevered box girder, and the heat preservation effect is ensured by making the heat preservation layer completely cover the outer formwork of the cantilevered box girder, thereby further enhancing the curing effect; the conveying mechanism conveys spray water or steam to the internal conveying pipe and the external conveying pipe respectively through the supply part to respectively cure the inner formwork and the outer formwork of the upper end face of the cantilevered box girder, and The flow rate of the spray water or steam output is adjusted by the regulating member to achieve the optimal temperature and humidity required for curing, with high flexibility and good curing effect. The control mechanism can monitor the temperature of the suspended cast box girder in real time through a thermometer, and at the same time, the controller can control the regulating member so that the regulating member adjusts the flow rate of the spray water or steam output by the conveying mechanism in real time according to the temperature data measured by the thermometer, thereby ensuring that the suspended cast box girder is always in the optimal curing condition and effectively preventing the occurrence of concrete cracking. In addition, the control mechanism can control the opening and closing of the supply member of the conveying mechanism through a timer to achieve automatic curing of the suspended cast box girder, with a high degree of automation. Compared with the existing artificial natural curing method, this method effectively reduces manual labor intensity and manpower input and is highly safe. In addition, the device has a simple structure and is easy to operate, which can greatly improve the construction efficiency of the suspended cast box girder, effectively shorten the construction period, and ensure the forming quality of the suspended cast box girder during winter construction.

[0023] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 This is a structural diagram of a cantilevered box beam concrete curing device according to a preferred embodiment of the present invention;

[0026] Figure 2 1 is a cross-sectional view of a concrete curing device for a cantilevered box beam according to a preferred embodiment of the present invention;

[0027] Figure 3 It is a cross-sectional view II of the cantilevered box girder concrete curing device of the preferred embodiment of the present utility model.

[0028] Legend:

[0029] 100. Insulation mechanism; 101. Bracket; 102. Greenhouse; 103. Insulation layer; 200. Conveying mechanism; 201. Internal conveying pipe; 2011. Support rod; 202. External conveying pipe; 2021. First bridge deck main pipe; 2022. Second bridge deck main pipe; 2023. Bridge deck branch pipe; 203. Supply part; 204. Adjustment part; 205. Blower; 206. Pad; 300. Control mechanism; 400. Solar panel. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0031] like Figure 1 、 Figure 2 and Figure 3As shown, the cantilever box girder concrete curing device of this embodiment includes an insulation mechanism 100, a conveying mechanism 200 and a control mechanism 300. The insulation mechanism 100 includes a bracket 101 fixed on the bridge deck and a greenhouse 102 installed on the bracket 101. The greenhouse 102 and the upper end surface of the cantilever box girder are enclosed to form a closed space to wrap the cantilever box girder in the greenhouse 102, so that the cantilever box girder is isolated from the external environment, preventing the temperature and humidity of the cantilever box girder from being lost during curing, ensuring the curing effect, and avoiding the influence of external cold air on the quality of the box girder during winter construction. Preferably, the insulation mechanism 100 also includes an insulation layer 103 sprayed on the surface of the outer mold of the cantilever box girder. The insulation effect is ensured by completely covering the outer mold of the cantilever box girder with the insulation layer 103, thereby further enhancing the curing effect. Preferably, the insulation layer 103 is made of 3 cm thick polyurethane plastic. The thermal conductivity of polyurethane plastic is 0.026w / m.°C, which has good thermal insulation performance. In addition, polyurethane material has the characteristics of convenient spraying construction and good sealing performance.

[0032] The conveying mechanism 200 includes an internal conveying pipe 201 passing through the inner mold of the cantilevered box girder, an external conveying pipe 202 arranged on the bridge deck, a supply member 203 for supplying spray water and / or steam to the internal conveying pipe 201 and the external conveying pipe 202, and a regulating member 204 for adjusting the flow rate of the spray water and / or steam output from the internal conveying pipe 201 and / or the external conveying pipe 202. The supply member 203 includes a water storage tank, a water pump, and an electric steam boiler. When spray curing of the cantilevered box girder is required, the water pump is turned on to transport water in the water storage tank to the internal conveying pipe 201 and the external conveying pipe 202 for spray curing of the cantilevered box girder. When steam curing of the cantilevered box girder is required, the electric steam boiler is turned on to supply steam to the internal conveying pipe 201 and the external conveying pipe 202. Thus, the conveying mechanism 200 delivers spray water or steam to the internal conveying pipe 201 and the external conveying pipe 202 through the supply part 203 to respectively cure the inner mold and the outer mold of the upper end face of the cantilevered box girder, and adjusts the flow rate of the output spray water or steam through the adjusting part 204 to achieve the optimal temperature and humidity required for curing, with high flexibility and good curing effect.

[0033] The control mechanism 300 includes a temperature detector for monitoring the temperature of the cantilevered box girder, a controller for controlling the flow rate of the regulating member 204, and a timer for controlling the timing opening and closing of the supply member 203. The controller is electrically connected to the temperature detector. Specifically, the control mechanism 300 can monitor the temperature of the cantilevered box girder in real time through the temperature detector, and at the same time, can control the regulating member 204 through the controller so that the regulating member 204 adjusts the flow rate of the spray water or steam output by the conveying mechanism 200 in real time according to the temperature data measured by the temperature detector, thereby ensuring that the cantilevered box girder is always in the best curing conditions and effectively avoiding the occurrence of cracking in the concrete. In addition, the control mechanism 300 can control the opening and closing of the supply member 203 of the conveying mechanism 200 through the timer to achieve automatic curing of the cantilevered box girder. The control mechanism 300 has a high degree of automation. Compared with the artificial natural curing method adopted in the prior art, the control mechanism 300 effectively reduces the intensity of manual labor and manpower input, and has a high degree of safety. Preferably, the temperature detector utilizes a Cu50 copper resistance temperature strain gauge or temperature sensor. During the production of the cantilevered box girder, a temperature strain gauge is embedded at each temperature measurement point. All temperature strain gauges are connected in parallel via wires and electrically connected to the regulating element 204. To ensure that the steam uniformly reduces temperature differences, multiple measurement points are arranged at each section, each capable of monitoring the temperature within the greenhouse 102, the cantilevered box girder inner and outer molds, and the bridge deck. This temperature monitoring promptly reflects the temperature of the steam, the cantilevered box girder outer molds, and the beam concrete. The monitored temperature data allows for real-time steam temperature adjustment, improving curing quality and ensuring the quality of the cantilevered box girder during winter construction.

[0034] During use, when the humidity of the concrete of the cantilevered box girder is insufficient and the cantilevered box girder needs to be sprayed for curing, the water pump is started to transport the spray water in the water storage tank to the internal delivery pipe 201 and the external delivery pipe 202 respectively, and the spray water is sprayed to the inner mold and the outer mold of the cantilevered box girder through the internal delivery pipe 201 and the external delivery pipe 202 respectively for spray curing. The temperature value displayed by the thermometer is observed to determine whether the cantilevered box girder is at a suitable curing temperature. If the temperature is not suitable, the control regulating part 204 is used to adjust the flow rate of the spray water transported by the internal delivery pipe 201 and the external delivery pipe 202. By adjusting the flow rate to achieve the adjustment of temperature and humidity, the concrete of the cantilevered box girder is always in the best curing conditions, effectively ensuring the curing Curing effect: When the concrete temperature of the cantilever box girder is insufficient and the cantilever box girder needs to be steam-cured, the electric steam boiler is started to supply steam to the internal conveying pipe 201 and the external conveying pipe 202 respectively, and steam is sprayed to the inner mold and outer mold of the cantilever box girder through the internal conveying pipe 201 and the external conveying pipe 202 respectively for steam curing. The temperature value displayed by the thermometer is observed to determine whether the cantilever box girder is at a suitable curing temperature. If the temperature is not suitable, the control regulating member 204 is used to adjust the flow rate of the steam supplied by the internal conveying pipe 201 and the external conveying pipe 202. By adjusting the flow rate of steam to achieve temperature regulation, the concrete of the cantilever box girder is always in the best curing condition, effectively ensuring the curing effect. Since the curing of concrete is divided into a static stop stage, a heating stage, a constant temperature stage, a cooling stage and a late curing stage, the opening and closing of the supply member 203 can be controlled by a timer to achieve timing control of each curing stage, ensuring the curing effect and a high degree of automation.

[0035] like Figure 3 As shown, a number of brackets 101 are set up on the upper end surface of the cantilevered box girder, so that the brackets 101 are symmetrically arranged along the length direction of the bridge deck. Preferably, the brackets 101 are made of steel pipes or square timber. The height of the brackets 101 on both sides of the bridge deck is set to 60 cm, and the height of the brackets 101 gradually decreases from the center point of the bridge deck toward the two sides of the bridge deck along the width direction of the bridge deck, so that the brackets 101 form a slope structure on the bridge deck. This height can not only ensure that the steam in the greenhouse 102 can be fully convected, but also will not cause a large temperature difference between the upper and lower parts of the greenhouse 102, thereby avoiding waste of heat energy, and the slope structure can quickly guide the accumulated water on the greenhouse 102 downward to avoid steam or spray water from accumulating on the greenhouse 102.

[0036] The greenhouse 102 includes a support grid fixed to the upper end of the bracket 101 and a tarpaulin covering the support grid. The support grid serves as a supporting skeleton of the tarpaulin to fix the tarpaulin so that the tarpaulin can be placed firmly and flatly on the bracket 101. The tarpaulin is firmly sealed to the upper end surface of the cantilevered box girder on all sides and the box hole at the end of the cantilevered box girder is sealed to fully ensure the thermal insulation effect of the cantilevered box girder. Preferably, the tarpaulin is provided with two layers to further enhance the thermal insulation effect. Openable heat dissipation holes are provided on the tarpaulin to allow the cantilevered box girder to be cooled when it reaches the cooling stage during curing. Preferably, the heat dissipation holes are evenly distributed on the tarpaulin to control the cooling rate and avoid cracks in the concrete caused by excessive cooling rate. A solar panel 400 is provided on the tarpaulin, and the solar panel 400 is electrically connected to the conveying mechanism 200 and / or the control mechanism 300 to provide electrical energy. Optionally, the supporting grid may be made of resistance wire, which is electrically connected to the solar panel 400 , so that the resistance wire can generate heat through the energy supplied by the solar panel 400 , thereby further enhancing the thermal insulation effect of the cantilevered box girder.

[0037] like Figure 2 As shown, the internal delivery pipe 201 is installed in the inner cavity of the cantilever box girder and is arranged in the middle of the inner cavity of the cantilever box girder along the length direction of the cantilever box girder. Support rods 2011 are symmetrically installed on both sides of the bottom of the inner cavity of the cantilever box girder. The two support rods 2011 are arranged crosswise below the internal delivery pipe 201 to support the internal delivery pipe 201 to a certain height, so that the internal delivery pipe 201 is placed in the middle of the inner cavity of the cantilever box girder. Therefore, the spray water and / or steam output from the internal delivery pipe 201 can be evenly sprayed in the inner cavity of the cantilever box girder, so that the top plate, web plate and bottom plate of the inner cavity of the cantilever box girder can be effectively wetted by water, avoiding large temperature differences in the inner cavity and achieving better maintenance effect. Preferably, the support rods 2011 are made of steel pipes to ensure their support rigidity.

[0038] like Figure 1 and Figure 2 As shown, the external delivery pipe 202 is laid on the bridge deck between the upper end surface of the cantilevered box girder and the tarpaulin, and includes a first deck main pipe 2021, a second deck main pipe 2022, and a deck branch pipe 2023. The first deck main pipe 2021 is laid on both sides of the bridge deck along the length of the bridge deck, the second deck main pipe 2022 is laid between the two first deck main pipes 2021, and the deck branch pipe 2023 is laid between the first and second deck main pipes 2021 along the width of the bridge deck and communicates with the first deck main pipe 2021. The first deck main pipe 2021 and / or the second deck main pipe 2022 are communicated with the supply member 203. Multiple deck branch pipes 2023 are provided along the length of the first deck main pipe 2021. Preferably, the deck branch pipes 2023 are galvanized steel pipes.

[0039] like Figure 2As shown, the first bridge deck main pipe 2021 is arranged on both sides of the bridge deck to increase the maintenance range. Grooves are opened on the cantilever box girders on both sides of the bridge deck. Pads 206 are arranged in the grooves to support the first bridge deck main pipe 2021 above, so that the first bridge deck main pipe 2021 and the second bridge deck main pipe 2022 and the bridge deck branch pipe 2023 are located at the same horizontal height on the bridge deck to improve the transmission efficiency of spray water and / or steam.

[0040] The ends of the internal delivery pipe 201, the first deck main pipe 2021, the second deck main pipe 2022 and the deck branch pipe 2023 are all sealed, and the internal delivery pipe 201, the first deck main pipe 2021, the deck branch pipe 2023 and the second deck main pipe 2022 are all provided with a plurality of steam spray holes spaced apart along the length direction, and a nozzle is detachably mounted on the steam spray hole. When in use, the electric steam boiler is turned on, and steam can be directly sprayed out through the steam spray hole onto the cantilevered box girder. When the cantilevered box girder needs to be sprayed, a nozzle is installed on the steam spray hole to achieve the conversion from air jet to water spray. Preferably, the diameter of the steam spray hole is 2 mm. A plurality of water outlet holes are provided on the nozzle, and the plurality of water outlet holes are arranged in a plum blossom shape to increase the spraying area of ​​the cantilevered box girder and improve the maintenance effect. Preferably, the lengths of the internal conveying pipe 201, the first bridge deck main pipe 2021, and the second bridge deck main pipe 2022 are adapted to the lengths of the cantilevered box girder to ensure that the maintenance area fully covers the cantilevered box girder.

[0041] like Figure 1 and Figure 2 As shown, the regulating member 204 includes regulating valves installed at the connection between the first deck main pipe 2021 and the deck branch pipe 2023, the connection between the supply member 203 and the first deck main pipe 2021, the connection between the supply member 203 and the second deck main pipe 2022, and the connection between the supply member 203 and the internal delivery pipe 201. By controlling the regulating valves, the water or air supply within the internal delivery pipe 201, the first deck main pipe 2021, the second deck main pipe 2022, and the deck branch pipe 2023 can be adjusted. Preferably, the regulating valve is a ball valve to ensure a sufficient water or air supply and improve maintenance efficiency.

[0042] like Figure 1 and Figure 2 As shown, the first bridge deck main pipe 2021 is arranged on both sides of the upper end surface of the cantilevered box girder, and a pad 206 is provided at the bottom thereof, which is used to support the first bridge deck main pipe 2021 on the upper end surface of the bridge deck so as to be located on the same horizontal plane as the second bridge deck main pipe 2022 and the bridge deck branch pipe 2023, so that the spray water or steam in the first bridge deck main pipe 2021 can flow more smoothly into the bridge deck branch pipe 2023, and at the same time it is convenient to control the flow rate and flow to ensure the maintenance effect.

[0043] Preferably, the control mechanism 300 also includes a humidity sensor for measuring humidity. The humidity sensor is arranged on the bridge deck and the inner mold of the cantilevered box girder and is connected to the regulating member 204 by wires. The humidity of the cantilevered box girder can be monitored by the humidity sensor. Similar to temperature monitoring, humidity monitoring is performed by setting humidity measuring points at multiple sections. Each section measuring point can monitor the humidity inside the greenhouse 102, the inner and outer molds of the cantilevered box girder, and the bridge deck, and transmits the humidity data to the regulating member 204. The regulating member 204 adjusts the amount of steam or spray water delivered by the conveying mechanism 200 according to the humidity, so that the humidity of the cantilevered box girder is always within the optimal curing conditions to ensure the curing effect.

[0044] like Figure 3 As shown, the conveying mechanism 200 further includes blowers 205, which are arranged on both sides of the upper end of the bridge deck and / or in the inner cavity of the suspended box girder and are electrically connected to the solar panel 400. A plurality of blowers 205 are arranged at intervals along the length direction of the suspended box girder. Thus, the blowers 205 are activated by the energy supplied by the solar panel 400. The blowers 205 in the inner cavity and upper end surface of the suspended box girder can blow steam toward the internal conveying pipe 201 and the external conveying pipe 202, respectively, so that the steam in the inner cavity of the suspended box girder and in the enclosed space formed by the upper end surface of the suspended box girder and the greenhouse 102 can form convection, so that the steam is evenly distributed on the inner and outer mold surfaces of the suspended box girder, greatly improving the curing efficiency and curing effect.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A cantilever box girder concrete curing device, characterized in that: include: The heat preservation mechanism (100) comprises a bracket (101) fixed on the bridge deck and a greenhouse (102) erected on the bracket (101), wherein the greenhouse (102) and the upper end surface of the cantilevered box beam are enclosed to form a closed space; The conveying mechanism (200) comprises an internal conveying pipe (201) passing through the inner mold of the cantilevered box girder, an external conveying pipe (202) arranged on the bridge deck, a supply member (203) for supplying spray water and / or steam to the internal conveying pipe (201) and the external conveying pipe (202), and an adjusting member (204) for adjusting the flow rate of the spray water and / or steam outputted from the internal conveying pipe (201) and / or the external conveying pipe (202); The control mechanism (300) includes a temperature detector for monitoring the temperature of the cantilevered box beam, a controller for controlling the adjustment of the adjustment member (204), and a timer for controlling the timing opening and closing of the supply member (203), wherein the controller is electrically connected to the temperature detector.

2. The cantilever box beam concrete curing device according to claim 1, characterized in that: The brackets (101) are symmetrically arranged along the length direction of the bridge deck, and the height of the brackets (101) gradually decreases from the center point of the bridge deck toward both sides of the bridge deck along the width direction of the bridge deck; The greenhouse (102) comprises a supporting grid fixed to the upper end of the bracket (101) and a tarpaulin covering the supporting grid, wherein the tarpaulin is provided with openable heat dissipation holes.

3. The cantilever box beam concrete curing device according to claim 2, characterized in that: A solar panel (400) is provided on the tarpaulin, and the solar panel (400) is electrically connected to the conveying mechanism (200) and / or the control mechanism (300) for providing electric energy.

4. The cantilevered box beam concrete curing device according to claim 1, characterized in that: The internal conveying pipe (201) is arranged in the middle of the cantilever box girder along the length direction of the cantilever box girder, and a support rod (2011) for supporting is set at the bottom of the cantilever box girder, and the support rods (2011) are symmetrically arranged on both sides of the inner mold of the cantilever box girder and are arranged in a cross manner.

5. The cantilevered box beam concrete curing device according to claim 1, characterized in that: The external transport pipe (202) comprises a first deck main pipe (2021) arranged on both sides of the bridge deck along the length direction of the bridge deck, a second deck main pipe (2022) arranged in the middle of the bridge deck, and a deck branch pipe (2023) arranged between the first deck main pipe (2021) and the second deck main pipe (2022) along the width direction of the bridge deck, wherein a plurality of the deck branch pipes (2023) are provided along the length direction of the first deck main pipe (2021), and the first deck main pipe (2021) is connected to the deck branch pipes (2023); The first bridge deck main pipe (2021) and / or the second bridge deck main pipe (2022) are in communication with the supply member (203).

6. The cantilever box beam concrete curing device according to claim 5, characterized in that: The regulating member (204) includes regulating valves installed at the connection between the first deck main pipe (2021) and the deck branch pipe (2023), the connection between the supply member (203) and the first deck main pipe (2021), the connection between the supply member (203) and the second deck main pipe (2022), and the connection between the supply member (203) and the internal delivery pipe (201).

7. The cantilever box beam concrete curing device according to claim 5, characterized in that: A pad (206) is provided at the bottom of the first deck main pipe (2021) for supporting the first deck main pipe (2021) on the upper end surface of the bridge deck so as to be located on the same horizontal plane as the second deck main pipe (2022) and the deck branch pipe (2023).

8. The cantilever box beam concrete curing device according to claim 5, characterized in that: The ends of the internal delivery pipe (201), the first bridge deck main pipe (2021), the bridge deck branch pipe (2023) and the second bridge deck main pipe (2022) are closed, and at least one of the internal delivery pipe (201), the first bridge deck main pipe (2021), the bridge deck branch pipe (2023) and the second bridge deck main pipe (2022) is provided with a plurality of steam injection holes along the length direction, and a nozzle is detachably mounted on the steam injection hole.

9. The cantilevered box beam concrete curing device according to claim 1, characterized in that: The control mechanism (300) further includes a humidity sensor for monitoring the humidity of the cantilevered box beam, wherein the humidity sensor is arranged on the cantilevered box beam and is electrically connected to the regulating member (204).

10. The cantilevered box beam concrete curing device according to claim 3, characterized in that: The conveying mechanism (200) further includes a blower (205), which is arranged on both sides of the upper end of the bridge deck and / or the inner mold of the cantilevered box beam and is electrically connected to the solar panel (400); A plurality of blowers (205) are arranged at intervals along the length direction of the cantilevered box girder, and are used to evenly distribute the spray water and / or steam delivered by the conveying mechanism (200) to the cantilevered box girder.

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