UHPC bridge deck slab cast-in-place seam steam curing gradient uniform-temperature and constant-temperature device

Abstract

The utility model discloses a UHPC bridge deck slab cast-in-situ seam steam-curing gradient uniform-temperature constant-temperature device which comprises a supporting plate, a heat preservation layer, a protection layer, a heating assembly, a temperature detection assembly and a controller. The supporting plate is arranged at the bottom of the cast-in-place seam; the heat preservation layer is arranged on the supporting plate; the protection layer is arranged between the heat preservation layer and the cast-in-place seam. The heating assembly is arranged between the heat preservation layer and the protection layer. The temperature detection assembly is pre-buried in the cast-in-place seam; the controller is electrically connected with the heating assembly and the temperature detection assembly and used for controlling the heating assembly to heat the cast-in-place seam according to temperature parameters fed back by the temperature detection assembly. By means of the structure, parameters such as the temperature and the temperature change rate of the steam curing chamber can be controlled, it is guaranteed that the bottom temperature of the bridge deck slab and the top temperature of the bridge deck slab are kept consistent all the time, and after curing is finished, the high-temperature steam curing cast-in-place joint can be very conveniently dismantled to the next to-be-operated high-temperature steam curing cast-in-place joint; the heating uniformity of each part in the height direction and the balanced reduction of the temperature of each area of the cast-in-place seam are realized.

Description

Technical Field

[0001] The utility model relates to a field, in particular to a gradient uniform temperature constant temperature device for steaming and curing cast-in-place seams of UHPC bridge panels. Background Art

[0002] Ultra-high performance concrete (UHPC) material is made by adding steel fibers to dense cement-based materials constructed based on the principle of maximum density, giving it ultra-high mechanical properties and durability. Applying UHPC to cast-in-place joints in steel-UHPC prefabricated assembly structures is beneficial to improving the quality of joints and the overall performance of bridge decks. Among them, high-temperature steam curing of UHPC cast-in-place joints can accelerate the hydration of UHPC cementitious materials and reduce later changes over time, which is an important step in improving joint strength.

[0003] Conventional methods for curing cast-in-place joints of steel-UHPC steel box girder bridge decks include natural curing and high-temperature steam curing:

[0004] 1. The curing conditions of natural curing are normal outdoor temperature. The temperature difference is controlled by covering with tarpaulin, and artificial watering is used to ensure humidity and reduce the occurrence of cracks under hydration. Under such conditions, there is a temperature difference between day and night. UHPC is greatly affected by the environment, and its performance is unstable. In addition, the bonding performance between the cast-in-place joint and the UHPC bridge deck interface is poor. The UHPC matrix strength and the pull-out ability and bonding strength of the steel fiber in the cast-in-place joint increase slowly.

[0005] 2. High-temperature steam curing is to generate steam from a steam boiler, use an internal steam pipe, steam-cure, and cover the top of the cast-in-place joint with an insulation layer (20). A temperature sensor is used to ensure that the cast-in-place joint is cured for 72 hours at a temperature not lower than 65°C. However, this curing method can only ensure that the top temperature of the cast-in-place joint is maintained at 65°C. The bottom of the cast-in-place joint is a steel plate, which loses temperature quickly, resulting in the inability to maintain the temperature of the lower layer. The uniformity of heating of each part of the steam-cured box girder in the height direction cannot be guaranteed, the steam-curing quality is low, and the heating and cooling rate is difficult to control.

[0006] Therefore, a gradient uniform temperature and constant temperature device for steaming and curing cast-in-place joints of UHPC bridge deck is needed to solve the above problems. Utility Model Content

[0007] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a gradient temperature-uniform constant temperature device for steaming and curing cast-in-place seams of UHPC bridge decks.

[0008] The technical solution adopted by an embodiment of the utility model to solve the technical problem is: a gradient uniform temperature constant temperature device for steaming cast-in-place seams of UHPC bridge decks, including a support plate, an insulation layer, a protective layer, a heating component, a temperature detection component and a controller;

[0009] The support plate is installed at the bottom of the cast-in-place joint;

[0010] The insulation layer is arranged on the support plate;

[0011] The protective layer is arranged between the thermal insulation layer and the cast-in-place joint;

[0012] The heating component is arranged between the thermal insulation layer and the protective layer;

[0013] The temperature detection component is embedded in the cast-in-place joint;

[0014] The controller is electrically connected to the heating component and the temperature detection component, and is used to control the heating component to heat the cast-in-place joint according to the temperature parameters fed back by the temperature detection component.

[0015] As one of the preferred embodiments of the utility model, the heating assembly is composed of a plurality of electric heating belts connected end to end.

[0016] As one of the preferred embodiments of the utility model, the distance between two adjacent electric heating belts is set to 0.03-0.05m.

[0017] As one of the preferred embodiments of the utility model, the temperature detection component includes three temperature sensors and the distances between the temperature detection component and the bottom surface of the cast-in-place joint are 0.1m, 0.07m and 0.02m respectively.

[0018] As one of the preferred embodiments of the utility model, the heating component is covered with thermal insulation glue so that the heating component is bonded to the thermal insulation layer.

[0019] As one of the preferred embodiments of the present utility model, the thermal insulation layer is provided as thermal insulation cotton.

[0020] As one of the preferred embodiments of the present utility model, the protective layer is provided as a steel plate.

[0021] As one of the preferred embodiments of the utility model, the support plate is connected to the bottom of the cast-in-place joint through a detachable structure.

[0022] As one of the preferred embodiments of the present utility model, the detachable structure is configured as a bolt connection structure.

[0023] The beneficial effects of the utility model include: a gradient uniform temperature and constant temperature device for steaming and curing cast-in-place joints of UHPC bridge decks, comprising a support plate, a thermal insulation layer, a protective layer, a heating component, a temperature detection component and a controller; the support plate is installed at the bottom of the cast-in-place joint; the thermal insulation layer is arranged on the support plate; the protective layer is arranged between the thermal insulation layer and the cast-in-place joint; the heating component is arranged between the thermal insulation layer and the protective layer; the temperature detection component is pre-buried in the cast-in-place joint; the controller is electrically connected to the heating component and the temperature detection component, and is used to control the heating component to heat the cast-in-place joint according to the temperature parameters fed back by the temperature detection component; the temperature of the steaming and curing chamber, the temperature change rate and other parameters can be controlled through the above structure to ensure that the bottom temperature of the bridge deck is always consistent with the top temperature of the bridge deck, and after the curing is completed, it can be very conveniently removed to the next high-temperature steam-cured cast-in-place joint to be operated, so as to achieve the uniformity of heating of each part in the height direction and the balanced decrease of the temperature of each area of ​​the cast-in-place joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 This is a simplified structural diagram of a gradient uniform temperature constant temperature device for steaming and curing cast-in-place seams of UHPC bridge decks;

[0026] Figure 2 for Figure 1 A partial enlarged view of the middle A area;

[0027] Figure 3 A schematic diagram of the heating component. DETAILED DESCRIPTION

[0028] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0029] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. 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.

[0032] Reference Figures 1 to 3 , a gradient temperature-uniform constant temperature device for steaming and curing cast-in-place seams of a UHPC bridge deck, comprising a support plate 10, a thermal insulation layer 20, a protective layer 30, a heating component 40, a temperature detection component 50 and a controller;

[0033] The support plate 10 is installed at the bottom of the cast-in-place joint 60;

[0034] The heat-insulating layer 20 is disposed on the support plate 10;

[0035] The protective layer 30 is disposed between the thermal insulation layer 20 and the cast-in-place joint 60;

[0036] The heating assembly 40 is disposed between the thermal insulation layer 20 and the protective layer 30;

[0037] The temperature detection component 50 is pre-buried in the cast-in-place joint 60;

[0038] The controller is electrically connected to the heating assembly 40 and the temperature detection assembly 50 , and is used to control the heating assembly 40 to heat the cast-in-place joint 60 according to the temperature parameter fed back by the temperature detection assembly 50 .

[0039] In this utility model:

[0040] (1) Manufacturing of the thermostatic device: It is composed of a support plate 10, an insulation layer 20, a protective layer 30, a heating component 40, a temperature detection component 50, a control line and a temperature control cabinet (controller), wherein, as a preferred embodiment of the insulation layer 20, the insulation layer 20 is set as insulation cotton; as a preferred embodiment of the protective layer 30, the protective layer 30 is set as a steel plate; as a preferred embodiment of the heating component 40, the heating component 40 is composed of a plurality of electric heating belts 41 connected end to end; specifically, the thin steel plate is connected to the insulation cotton by backing adhesive, and the electric heating belt 41 is S-shaped and fixed to the insulation cotton by insulation adhesive to form a heating system, and the temperature sensor is pre-buried in the cast-in-place joint and connected to the heating system, the control line and the temperature control cabinet;

[0041] (2) Constant temperature maintenance control of the base plate

[0042] ① The modular thermostatic device is fixed to the steel plate of the bottom plate of the cast-in-place joint by bolts, and temperature sensors 51 are embedded at 0.02m, 0.07m and 0.1m from the bottom surface of the cast-in-place joint to measure the temperature of each area of ​​the cast-in-place joint;

[0043] ② Pour UHPC on the cast-in-place joints, wet-cured for 48 hours, and then cover the top surface of the cast-in-place joints with an insulation layer for steam curing. The heating rate during the heating stage is no more than 10℃ / h until it reaches 63-68℃, and the temperature is kept constant for 72 hours;

[0044] ③ The temperature sensor 51 transmits data to the temperature control cabinet. The measurement error accuracy of the temperature sensor 51 is not greater than 1°C. The temperature control cabinet controls the temperature of the heating system, the temperature change rate and other parameters according to the set temperature parameters and the numerical values ​​transmitted in real time by the temperature sensor 51, so as to achieve the consistency of the bottom temperature of the cast-in-place joint bottom plate with the top temperature of the cast-in-place joint bottom plate and the automatic temperature control;

[0045] ④ During the cooling process of the cast-in-place joint, the temperature control system is turned off through the temperature control cabinet, and the steam curing system continues to cool down. The cooling rate should not be greater than 10℃ / h until it drops to the ambient temperature;

[0046] ⑤ After the curing of the cast-in-place joint is completed, unscrew the anchor bolts, remove the constant temperature control device, and install it on the next cast-in-place joint to achieve the reuse of the gradient uniform temperature constant temperature device for steam curing the cast-in-place joint of the UHPC bridge deck;

[0047] The advantages of the utility model are:

[0048] 1. It is flexible in operation, saves materials and improves construction quality;

[0049] 2. The structure is simple, the material selection is relatively conventional, and it can be processed and produced by itself;

[0050] 3. The utility model has specially designed the heat preservation method for the bottom surface of the cast-in-place joint, ensuring that the bottom temperature of the cast-in-place joint bottom plate is consistent with the top temperature of the cast-in-place joint bottom plate, which can solve the problem that when the bottom is a steel plate, the temperature loss is fast, resulting in the inability to maintain the temperature of the lower layer;

[0051] 4. Improve the quality of steaming and curing, improve the efficiency of steaming and curing construction, and at the same time ensure the uniformity of steaming temperature in the height direction, ensure that all parts of the steaming box beam are evenly heated, thereby ensuring the quality of steaming and curing, and shortening the heating and cooling time to the maximum extent. The heating and cooling must be strictly carried out according to the requirements to ensure the quality of steaming and curing and improve the efficiency of steaming and curing construction.

[0052] Preferably, the distance between two adjacent electric heating belts 41 is set to 0.03-0.05m.

[0053] Preferably, the temperature detection assembly 50 includes three temperature sensors 51 and the distances between the temperature detection assembly 50 and the bottom surface of the cast-in-place joint 60 are 0.1 m, 0.07 m and 0.02 m respectively.

[0054] The heating component 40 is covered with thermal insulation glue so that the heating component 40 is bonded to the thermal insulation layer 20; the heating component 40 is first temporarily fixed to the thermal insulation layer 20 with tape, and then fully covered with thermal insulation glue after it is fully installed.

[0055] The support plate 10 is connected to the bottom of the cast-in-place joint 60 via a detachable structure 70 .

[0056] As a preferred embodiment of the detachable structure 70, the detachable structure 70 is configured as a bolt connection structure.

[0057] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A gradient temperature-constant device for steaming and curing cast-in-place seams of UHPC bridge decks, characterized in that: It comprises a support plate (10), a heat-insulating layer (20), a protective layer (30), a heating component (40), a temperature detection component (50) and a controller; The support plate (10) is installed at the bottom of the cast-in-place joint (60); The thermal insulation layer (20) is arranged on the support plate (10); The protective layer (30) is arranged between the thermal insulation layer (20) and the cast-in-place joint (60); The heating component (40) is arranged between the thermal insulation layer (20) and the protective layer (30); The temperature detection component (50) is pre-buried in the cast-in-place joint (60); The controller is electrically connected to the heating component (40) and the temperature detection component (50), and is used to control the heating component (40) to heat the cast-in-place joint (60) according to the temperature parameter fed back by the temperature detection component (50).

2. The device for steaming and curing cast-in-place seams of UHPC bridge deck according to claim 1 is characterized in that: The heating assembly (40) is composed of a plurality of electric heating belts (41) connected end to end.

3. A gradient temperature-constant device for steaming and curing cast-in-place seams of UHPC bridge decks according to claim 2, characterized in that: The distance between two adjacent electric heating belts (41) is set to 0.03-0.05m.

4. The device for steaming and curing cast-in-place seams of UHPC bridge deck according to claim 1 is characterized in that: The temperature detection component (50) comprises three temperature sensors (51) and the distances between the temperature detection component (50) and the bottom surface of the cast-in-place joint (60) are 0.1 m, 0.07 m and 0.02 m respectively.

5. The device for steaming and curing cast-in-place seams of UHPC bridge deck according to claim 1 is characterized in that: The heating component (40) is covered with thermal insulation glue so that the heating component (40) is bonded to the thermal insulation layer (20).

6. The device for steaming and curing cast-in-place seams of UHPC bridge deck according to claim 1 is characterized in that: The thermal insulation layer (20) is configured as thermal insulation cotton.

7. The device for steaming and curing cast-in-place seams of UHPC bridge deck according to claim 1 is characterized in that: The protective layer (30) is configured as a steel plate.

8. The device for steaming and curing cast-in-place seams of UHPC bridge deck according to claim 1 is characterized by: The support plate (10) is connected to the bottom of the cast-in-place joint (60) via a detachable structure (70).

9. The device for steaming and curing cast-in-place seams of UHPC bridge deck according to claim 8, characterized in that: The detachable structure (70) is configured as a bolt connection structure.

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