High-temperature steam curing device for large-size UHPC prefabricated slab
By designing a closed maintenance space and a return tank to collect water vapor, combined with steam maintenance system and temperature control, the problem of increasing water when the UHPC prefabricated plate is large, and the maintenance quality and environmental protection are improved.
Patent Information
- Application Number
- CN202422400652.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-29
AI Technical Summary
In the prior art, when the UHPC prefabricated plate is large in size and steam maintenance is performed for a long time, the water in the ordinary steam maintenance device increases, affecting the maintenance quality and causing inconvenience to the surrounding environment.
A large-size UHPC prefabricated plate high-temperature steam maintenance device is designed, including the upper and lower maintenance structures, forming a closed maintenance space, using the return water tank to collect excess water, and combining the steam maintenance system and the monitoring and temperature regulation system to ensure uniform steam spraying and temperature control.
It effectively reduces the impact of excess water during steam maintenance, improves the quality of maintenance, and avoids pollution to the surrounding environment, achieving efficient steam maintenance effects.
Smart Images
Figure CN223147389U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of ultra-high performance concrete curing devices, and particularly relates to a high-temperature steam curing device for large-size UHPC precast slabs. Background Art
[0002] UHPC, the full name is Ultra-High Performance Concrete, that is, ultra-high performance concrete. It is a new type of building material with extremely high strength, toughness and durability. The raw materials of UHPC mainly consist of cement, silica fume, microbeads, water reducer, quartz sand and steel fibers, etc. Its mix proportion design adopts the dense packing theory, and uses ultra-small particle size materials to fill the pores between material particles, so as to minimize the pore defects and microcracks inside the matrix. This high density makes UHPC have ultra-high mechanical properties and excellent durability. Therefore, UHPC has become an ideal material for long-span bridge structures, effectively reducing the need for later operation and maintenance of bridges. However, UHPC does not contain coarse aggregate, and the amount of cementitious materials selected is large, resulting in a relatively high shrinkage. In order to improve the density of the UHPC matrix and reduce the cracking of the concrete section and the long-term deformation of the bridge (such as shrinkage and creep), high-temperature steam curing treatment can significantly reduce the shrinkage and creep of UHPC and promote the hydration reaction of cementitious materials to be completed as soon as possible.
[0003] At present, bridge structures are developing towards prefabrication and lightweight, and the UHPC precast bridge deck steel composite beam system has become a trend. In order to enable the UHPC precast slab to quickly complete shrinkage and strength development, a high-temperature steam curing system is usually used for curing, generally curing at 80°C for 72h or 90°C for 48h. Moreover, the UHPC precast slabs of long-span bridges often have the characteristics of large size, ultra-wide and ultra-long. Ordinary concrete steam curing devices are difficult to meet the requirements of curing temperature; and when steam curing is carried out for a long time, after the steam in the steam curing device liquefies into liquid, the water in the ordinary steam curing device increases, and the excess water affects the internal UHPC precast slab, affecting the curing quality and causing inconvenience to the surrounding environment. Summary of the Utility Model
[0004] This application provides a high-temperature steam curing device for large-size UHPC precast slabs, which can solve the technical problems existing in the prior art that the UHPC precast slabs are relatively large in size and when steam curing is carried out for a long time, the water in the ordinary steam curing device increases, and the excess water affects the curing quality and causes inconvenience to the surrounding environment.
[0005] An embodiment of this application provides a high-temperature steam curing device for large-size UHPC precast slabs, which includes:
[0006] Upper curing structure, with a lifting hook provided on the upper curing structure;
[0007] Lower curing structure, with a water return groove provided at the top of the lower curing structure, and the upper curing structure and the lower curing structure are spliced with each other to form a sealed curing space;
[0008] And a steam curing system, which is arranged inside the lower curing structure and is used for spraying steam in the sealed curing space.
[0009] In one embodiment, the upper curing structure includes:
[0010] Upper support steel frame, which is set as a rectangular frame with an open bottom end;
[0011] Closed cover plate, which is arranged on the top of the upper support steel frame, and the lifting hook is arranged on the closed cover plate;
[0012] And an upper heat preservation member, which is arranged on the side wall of the upper support steel frame.
[0013] In one embodiment, the upper heat preservation member is set as a foam heat preservation cotton board.
[0014] In one embodiment, the lower curing structure includes:
[0015] Concrete heat preservation wall, which is set as a rectangular structure with an open top, and the water return groove is arranged on the top of the concrete heat preservation wall;
[0016] And a lower heat preservation structure, which is wrapped outside the concrete heat preservation wall.
[0017] In one embodiment, the lower heat preservation structure includes:
[0018] Lower support steel frame, which is arranged on the side wall of the concrete heat preservation wall;
[0019] And a lower heat preservation member, which is arranged on the side wall of the lower support steel frame.
[0020] In one embodiment, the lower heat preservation member is set as a foam heat preservation cotton board.
[0021] In one embodiment, the steam curing system includes:
[0022] Steam pipeline, which is laid in the lower curing structure through a number of fixed slots, and the steam pipeline passes out of the lower curing structure;
[0023] And a control valve, which is arranged on the section where the steam pipeline penetrates out of the lower curing structure.
[0024] In one embodiment, the steam curing system further includes:
[0025] A monitoring and temperature regulating system, which is arranged inside the lower curing structure and is used for monitoring the temperature inside the sealed curing space and capable of regulating the temperature inside the sealed curing space.
[0026] In one embodiment, the monitoring and temperature regulating system includes:
[0027] A temperature sensor, which is arranged inside the lower curing structure;
[0028] And a temperature control box, which is communicated with the temperature sensor and the control valve.
[0029] In one embodiment, a plurality of supporting pads are also dispersedly arranged inside the lower curing structure.
[0030] The beneficial effects brought by the technical solution provided by the embodiment of the present application include:
[0031] By splicing the upper curing structure and the lower curing structure to form a sealed curing space, in actual steam curing operations, the UHPC precast slab can be first lifted into the lower curing structure by using a lifting tool, and then the upper curing structure can be lifted into the lower curing structure, which is convenient for erection. Moreover, the size of the sealed curing space is determined by the volume of the upper curing structure and the lower curing structure, and can be customized according to the size of the UHPC precast slab before steam curing operations; the water return groove of the lower curing structure can collect the liquefied water inside the sealed curing space, reduce the excess water inside the sealed curing space during the long-term steam curing process, improve the curing quality, and collect the excess water generated during the steam curing process, solving the problems existing in the prior art that the UHPC precast slab has a large size and the water in the ordinary steam curing device increases during the long-term steam curing, and the excess water affects the curing quality and causes inconvenience to the surrounding environment. Description of the Drawings
[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.
[0033] Figure 1It is a schematic structural diagram of the upper curing structure in a high-temperature steam curing device for large-size UHPC precast slabs in this application;
[0034] Figure 2 It is a schematic structural diagram of the lower curing structure in a high-temperature steam curing device for large-size UHPC precast slabs in this application;
[0035] In the figure: 1. Upper support steel frame; 2. Foam insulation board; 3. Enclosed cover plate; 4. Lifting hook; 5. Concrete insulation wall; 6. Return water tank; 7. Fixed slot hole; 8. Steam pipeline; 9. Support backing plate; 10. Lower support steel frame; 11. Control valve; 12. Temperature control box; 13. Temperature sensor. Detailed implementation manners
[0036] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this application.
[0037] The embodiment of this application provides a high-temperature steam curing device for large-size UHPC precast slabs, which can solve the problems in the prior art that the UHPC precast slabs are relatively large in size and when steam curing is carried out for a long time, the water in the ordinary steam curing device increases, and the excess water affects the curing quality and causes inconvenience to the surrounding environment.
[0038] Refer to Figure 1 , a high-temperature steam curing device for large-size UHPC precast slabs disclosed in this application includes an upper curing structure, a lower curing structure and a steam curing system. The upper curing structure and the lower curing structure are spliced with each other to form a closed curing space. The large-size UHPC precast slab is placed in the closed curing space. The steam curing system is arranged in the lower curing structure and sprays steam into the closed curing space, so as to realize the steam curing operation of the large-size UHPC precast slab inside. A lifting hook 4 is arranged on the upper curing structure. When assembling the upper curing structure and the lower curing structure, the lifting hook 4 is convenient for the lifting tool to clamp, so as to splice the upper curing structure to the lower curing structure. The volume of the closed curing space is related to the volume of the upper curing structure and the lower curing structure. Before the steam curing operation, the size can be customized according to the size of the large-size UHPC precast slab.
[0039] When performing steam curing on large-sized UHPC precast slabs, the steam curing system is arranged inside the lower curing structure. Therefore, steam is sprayed from bottom to top in the closed curing space. The steam at the upper part is likely to liquefy first to form water vapor when it contacts the edge of the upper curing structure and then drip along the upper curing structure. The water return groove 6 at the top of the lower curing structure can intercept the water vapor, enabling most of the liquefied excess water vapor to be collected into the water return groove 6, so as to reduce the impact of the flowing excess water vapor on the curing quality and the surrounding construction environment.
[0040] More specifically, referring to Figure 1 , the upper curing structure includes an upper support steel frame 1, a closed cover plate 3, and upper heat preservation components. The upper support steel frame 1 is a rectangular frame formed by welding multiple steel bars together, and there is an opening at the lower part of the upper support steel frame 1. The closed cover plate 3 is covered on the top of the upper support steel frame 1. The closed cover plate 3 can be selected to be welded or bolted to the top of the upper support steel frame 1 according to the actual construction conditions, as long as it can maintain good sealing performance of the upper curing structure. The lifting hook 4 is welded on the top of the closed cover plate 3. In an embodiment of the present application, specifically two lifting hooks 4 are provided and are respectively welded at both ends of the closed cover plate 3 along the length direction of the closed cover plate 3, so as to lift the entire upper curing structure more smoothly; the upper heat preservation components are arranged on the side walls of the upper support steel frame 1 to insulate the upper curing structure. The upper heat preservation components are specifically selected as foam heat preservation cotton boards 2. The foam heat preservation cotton boards 2 have a certain hardness for easy installation and have good heat preservation performance. In other embodiments, other materials with good heat preservation performance and easy installation can also be selected to replace the upper heat preservation components.
[0041] Referring to Figure 2 , the lower curing structure includes a concrete heat preservation wall 5 and a lower heat preservation structure. The concrete heat preservation wall 5 is a rectangular structure with an open top formed by pouring five concrete slabs, which is used to place large-sized UHPC precast slabs. The water return groove 6 is specifically arranged on the top surface of the wall of the concrete heat preservation wall 5, and the size of the water return groove 6 is adapted to the size of the concrete heat preservation wall 5. The lower heat preservation structure is wrapped on the side walls of the concrete heat preservation wall 5 to further insulate the concrete heat preservation wall 5 and reduce the temperature loss during the steam curing process of the concrete.
[0042] The lower heat preservation structure includes a lower support steel frame 10 and lower heat preservation components. The lower support steel frame 10 is attached along the side walls of the concrete heat preservation wall 5, and the lower heat preservation components are fixed on the lower support steel frame 10 to wrap the side walls of the concrete heat preservation wall 5. The structure is simple and convenient for installation at the construction site. The lower heat preservation components are also selected as foam heat preservation cotton boards 2 to insulate and heat the concrete heat preservation wall 5.
[0043] More specifically, the size of the return water tank 6 is slightly larger than the top opening size of the concrete insulation wall 5, so that the upper curing structure can be inserted into the return water tank 6, which is convenient for the assembly of the upper curing structure and the lower curing structure. When building the curing enclosed space, the lower curing structure can be built first, and then the upper curing structure. Use a hoisting tool to place the large-size UHPC precast slab in the lower curing structure, and finally use a hoisting tool to assemble the upper curing structure onto the lower curing structure to start the steam curing operation of the large-size UHPC precast slab.
[0044] Furthermore, a plurality of support pads 9 are dispersedly installed at the bottom of the concrete insulation wall 5. The support pads 9 can support the large-size UHPC precast slab, so that there is a certain distance between the large-size UHPC precast slab and the bottom of the concrete insulation wall 5. During the steam curing process, when the water droplets that are not collected into the return water tank fall onto the bottom surface of the concrete insulation wall 5, the large-size UHPC precast slab can keep a certain distance from the water on the bottom surface, avoiding the long-term contact between the large-size UHPC precast slab and the liquefied water, thereby improving the curing quality of the large-size UHPC precast slab.
[0045] Refer to Figure 2 , the steam curing system includes a steam pipe 8 and a control valve 11. A plurality of fixed slots 7 are distributed on the side wall of the concrete insulation wall 5. The steam pipe 8 passes through the fixed positions of the fixed slots 7 to be fixed on the inner wall of the concrete insulation wall 5. The steam pipes 8 are laid on all four sides of the concrete insulation wall 5. A plurality of steam injection holes are spaced on the surface of the steam pipe 8, so that steam is sprayed on all four sides of the concrete insulation wall 5, making the steam spraying received by the large-size UHPC precast slab more uniform. The steam pipe 8 passes out of the lower curing structure, and a control valve 11 is provided on the passing-out section of the steam pipe 8, so that construction personnel can switch the steam in the closed curing space from the outside, which is more convenient to use.
[0046] Furthermore, in order to better monitor the temperature in the closed curing space and fine-tune the temperature in the closed curing space in a timely manner, the steam curing system also includes a monitoring and temperature control system. The monitoring and temperature control system includes a temperature sensor 13 and a temperature control box 12. The temperature sensor 13 is arranged on the inner wall of the concrete insulation wall 5 to monitor the temperature in the closed curing space in real time. In order to more comprehensively monitor the temperature at different positions in the closed curing space, the temperature sensor 13 can also be installed on the sealing cover plate or the upper insulation part of the upper curing structure; the temperature control box 12 is arranged outside the lower curing structure and is connected to the temperature sensor 13 and the control valve 11, so that operators can adjust the temperature in the closed curing space from the outside at any time, which is more convenient to use.
[0047] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0048] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.
[0049] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A high-temperature steam curing device for large-sized UHPC precast slabs, characterized in that, It includes: An upper curing structure, on which a lifting hook (4) is provided; A lower curing structure, at the top of which a water return groove (6) is provided, and the upper curing structure and the lower curing structure are spliced with each other to form a closed curing space; And a steam curing system, which is arranged in the lower curing structure and is used for spraying steam in the closed curing space.
2. The high-temperature steam curing device for large-sized UHPC precast slabs according to claim 1, characterized in that, The upper curing structure includes: An upper support steel frame (1), which is set as a rectangular frame with an open lower end; A closed cover plate (3), which is arranged on the top of the upper support steel frame (1), and the lifting hook (4) is arranged on the closed cover plate (3); And an upper heat preservation component, which is arranged on the side wall of the upper support steel frame (1).
3. The high-temperature steam curing device for large-size UHPC precast slabs according to claim 2, wherein: The upper heat preservation component is set as a foam heat preservation cotton board (2).
4. A high-temperature steam curing device for large-size UHPC precast slabs according to claim 1, characterized in that, The lower curing structure includes: A concrete heat preservation wall (5), which is set as a rectangular structure with an open top, and the water return groove (6) is arranged on the top of the concrete heat preservation wall (5); And a lower heat preservation structure, which is wrapped outside the concrete heat preservation wall (5).
5. A high-temperature steam curing device for large-size UHPC precast slabs according to claim 4, characterized in that, The lower heat preservation structure includes: A lower support steel frame (10), which is arranged on the side wall of the concrete heat preservation wall (5); And a lower heat preservation component, which is arranged on the side wall of the lower support steel frame (10).
6. The high-temperature steam curing device for large-size UHPC precast slabs according to claim 5, wherein: The lower heat preservation component is set as a foam heat preservation cotton board (2).
7. The high-temperature steam curing device for large-size UHPC precast slabs according to claim 1, characterized in that, The steam curing system includes: A steam pipeline (8), which is laid in the lower curing structure through a plurality of fixed slots (7), and the steam pipeline (8) penetrates out of the lower curing structure; And a control valve (11), which is arranged on the section where the steam pipeline (8) penetrates out of the lower curing structure.
8. A high-temperature steam curing device for large-size UHPC precast slabs according to claim 7, characterized in that, The steam curing system further includes: A monitoring and temperature control system, which is arranged in the lower curing structure, and the monitoring and temperature control system is used for monitoring the temperature in the closed curing space and can adjust the temperature in the closed curing space.
9. The high-temperature steam curing device for large-size UHPC precast slabs according to claim 8, characterized in that, The monitoring and temperature control system includes: A temperature sensor (13), which is arranged in the lower curing structure; And a temperature control box (12), which is communicated with the temperature sensor (13) and the control valve (11).
10. The high-temperature steam curing device for large-size UHPC precast slabs according to claim 1, wherein: A plurality of support pads (9) are also dispersedly arranged in the lower curing structure.