CN117162244A - Ultra-large-volume prefabricated member maintenance device and method - Google Patents

Abstract

The invention provides a device and a method for curing an oversized prefabricated member, which belong to the technical field of prefabrication and are used for curing concrete with large volume and thickness. The conventional curing means can only act on the surface of the concrete preform, and has the problem of insufficient curing of the large-volume and thick preform. The device comprises a die assembly and a maintenance frame. The mold assembly includes a plurality of mold pockets that are ultimately formed into the structural holes of the preform. The curing frame comprises a plurality of curing guard plates which enclose a curing cavity, and a curing tube is arranged on the top of the curing cavity; the maintenance frame comprises a transverse internal maintenance device which is connected with two ends of the structural hole. The gap between the curing frame and the prefabricated member body and the inside of the structural hole are filled with curing materials, and curing medium is conveyed in the curing tube. The combination of the curing device and the method can create and maintain the environmental conditions required by the hydration of the concrete, so that each part of the concrete is uniformly and rapidly hardened, the curing period is reduced, and the curing quality is improved.

Description

Ultra-large-volume prefabricated member maintenance device and method

Technical Field

The invention belongs to the technical field of cement prefabrication, and particularly relates to an ultra-large-volume prefabricated member maintenance device and method.

Background

Because the ultra-large-volume prefabricated member has the characteristics of large volume and thicker structure, the problems are brought to the production and maintenance of the prefabricated member. When cement is mixed with water during the production of prefabricated member, the water goes deep into the cement particles to generate hydration reaction. After the small cement particles are hydrated, the volume is increased, gaps among the particles are reduced, the small cement particles are finally connected into a block, the cement is harder and the density is higher and higher, and finally the prefabricated member of the concrete structure is formed. This process mainly includes three phases: an initial setting stage, which is typically around one hour; a final setting stage, typically several hours to about one day after the initial setting stage, after which the cement slurry is completely plastic-free; the curing stage, which is usually about one month after final setting, continues the hydration reaction of the cement, so that the hardness and strength of the concrete are gradually improved.

The curing stage aims to create proper temperature and humidity conditions for the hydration and hardening process of the concrete, the environmental temperature of the concrete has great influence on the hydration of the cement, and the higher the temperature is, the faster the hydration speed is and the strength of the concrete is developed. In the process, moisture is indispensable, cement can be formed into hard blocks at the river bottom and the sea bottom, but under the condition of dehydration, cement particles formed with gel cannot be hydrated sufficiently to influence the development of strength and hardness, and cracks can be formed even due to temperature difference and shrinkage unevenness in the concrete caused by hydration difference of the cementing materials in the concrete.

In the related art, the curing means includes water spraying curing, film curing, steam curing and the like. Spraying water on the surface of the concrete in a designated period to keep moist; the film curing is to cover the concrete surface with the film to prevent the evaporation of water, and the two schemes are applicable to concrete structures with small volumes or thinner thickness. And the steam curing is to put the concrete in an environment full of steam, and the steam is used for maintaining the humidity of the environment, so that the mode has higher cost and is more suitable for a small-volume precast concrete structure.

In the invention, because the ultra-large-volume prefabricated part has large volume and thick thickness, the curing means only can act on the surface of the prefabricated part, water sprayed on the surface of the concrete is difficult to enter the interior and can evaporate quickly, and in order to ensure the curing quality, the spraying is required to be continuously carried out within a period of days, so that the manual workload is high and the effect is unstable; the steam curing has high cost and high energy consumption, and has poor curing effect on large-volume and large-thickness concrete in the scene.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention aims to provide an ultra-large volume prefabricated member curing device and method, which are used for solving the problems that in the prior art, large-volume and large-thickness concrete prefabricated members are difficult to cure and internal and external balanced curing cannot be achieved.

To achieve the above and other related objects, the present invention provides an ultra-large volume preform curing apparatus and method.

The ultra-large-volume prefabricated member curing device is used for curing a prefabricated member body, wherein the prefabricated member body is formed by pouring concrete slurry, and comprises a die assembly and a curing frame;

the mould assembly comprises a structure hole mould and a plurality of outer mould plates, wherein the outer mould plates are enclosed to form a pouring area of the prefabricated member body, the structure hole mould comprises a first mould air bag and a second mould air bag, the first mould air bag is vertically arranged in the pouring area, the second mould air bag is transversely arranged in the pouring area, two end sleeves are respectively connected with two ends of the second mould air bag and are fixed on the outer mould plates, and the first mould air bag and the second mould air bag are pressed and expanded to form an inner mould and finally form a first structure hole and a second structure hole of the prefabricated member body;

the maintenance frame comprises a plurality of structural members and maintenance plates, the structural members are spliced to form a framework of the maintenance frame, the maintenance plates are spliced to form a maintenance cavity, the maintenance plates are fixed on the framework, the maintenance plates at the bottom of the maintenance cavity are provided with water permeability, the bottom of the maintenance frame is provided with a water collecting structure, the top of the maintenance cavity is provided with a first maintenance pipe, and the first maintenance pipe is provided with a plurality of spraying holes;

The maintenance frame further comprises a transverse inner maintenance device, the transverse inner maintenance device comprises a first sealing end and a second sealing end, the first sealing end and the second sealing end are respectively connected to two ends of the second structural hole, and the outer part of the transverse inner maintenance device is communicated with the second maintenance pipe;

the space between the curing frame and the prefabricated member body, the first structural holes and the second structural holes are filled with curing materials, curing media flow through the first curing pipe and the second curing pipe, and the first curing pipe is provided with a second valve.

Optionally, the first sealing end comprises a pipe body, a sealing head and a sealing tail, and the sealing head and the sealing tail are arranged at two ends of the pipe body;

the sealing head comprises a filter screen, a pressure valve and an elastic membrane, wherein the pressure valve is connected to the tail end of the pipe body, the filter screen is arranged on the outlet side of the pressure valve, the elastic membrane is arranged on the other side of the pressure valve, the elastic membrane is annularly sleeved on the pipe body, the two ends of the elastic membrane are hermetically connected with the pipe body into a whole, a balance hole is formed in the pipe body wrapped by the elastic membrane, and in an initial state, the outer diameter of the elastic membrane is smaller than the outer diameter of the pipe body;

The sealing tail comprises a water stop plug and an elastic piece, the water stop plug comprises a trigger end and a water stop end, the trigger end and the water stop end are connected through a plug rod, a water stop block is arranged on the pipe body, a plug hole is formed in the water stop block, one end of the plug hole is matched with the section of the plug rod, the other end of the plug hole is matched with the section of the water stop end, the elastic piece is sleeved on the plug rod and is positioned between the trigger end and the water stop block, and in an initial state, the elastic piece props against the trigger end and seals between the water stop end and the water stop block;

one end of the second maintenance pipe is connected to the sealing tail, a trigger block is arranged in the second maintenance pipe, and when the second maintenance pipe is connected, the trigger block is matched with the trigger end, and a first valve is arranged on the second maintenance pipe.

Optionally, the second sealing end comprises a filter screen, a first humidity sensor, a temperature sensor, a sealing ring and a pipe body, the filter screen and the temperature sensor are arranged at the tail end of the pipe body, the first humidity sensor comprises two probes which are respectively arranged at the upper side and the lower side of the tail end of the pipe body, and the sealing ring is annular and is sleeved on the pipe body;

the other end of the pipe body is also provided with a third valve and a pressure sensor, and the pressure sensor is arranged on the inner side of the third valve.

Optionally, the maintenance material is a material with functions of absorbing water and guiding temperature.

Optionally, the maintenance medium is steam or water.

Optionally, the curing frame further comprises a plurality of sets of pouch drive assemblies, the pouch drive assemblies comprising a shaft and a drive pouch;

the utility model discloses a maintenance frame, including the axostylus axostyle, the axostylus axostyle both ends rotate connect in maintenance frame, the drive bag cladding in axostylus axostyle and both ends all with axostylus axostyle sealing connection, the axostylus axostyle is inside to be equipped with the injection channel, the axostylus axostyle by drive bag cladding section is equipped with the connector, the connector intercommunication drive bag inside region with the injection channel of axostylus axostyle, axostyle tip and outside injection system intercommunication.

The curing method of the ultra-large-volume prefabricated member adopts the curing device, and comprises the following steps:

a prefabricated member final setting step, namely assembling an outer layer template and a structural hole die of the prefabricated member in the maintenance frame, applying pressure to the first die air bag and the second die air bag to expand and form the first die air bag and the second die air bag, and then pouring the mixed concrete slurry into the die to wait for the concrete slurry to be set;

after the final setting of the concrete slurry is completed, removing an outer layer template and a structural hole die of the prefabricated member, but keeping the end sleeve, arranging a second humidity sensor at the bottom of the curing cavity, filling curing materials into the first structural hole and the second structural hole, respectively butting the two ends of the first structural hole with the first sealing end and the second sealing end, and filling the curing materials into a gap between the curing frame and the prefabricated member;

And in the maintenance step, the opening and closing states of the first valve, the second valve and the third valve are switched, when the first valve, the second valve and the third valve are opened, the spraying holes spray water downwards from the top of the maintenance frame, and the second maintenance pipe injects water into the second structural hole through the first sealing end.

Optionally, the method further comprises a detection step, wherein the detection step adopts a water pressure detection mode or an air pressure detection mode;

the method comprises the following steps: and opening the first valve and the third valve, filling water or air into the second structure hole, closing the first valve and the third valve after the pressure is stable, and monitoring the change of the pressure in the second structure hole.

Optionally, the curing step comprises an early curing stage and a later curing stage;

in the early maintenance stage: the first valve, the second valve and the third valve are continuously opened, and the water temperatures in the spraying hole and the second maintenance pipe are changed values;

in the post-curing stage: the first valve, the second valve and the third valve are opened according to the condition that when the detection values of the first humidity sensor and the second humidity sensor are lower than a set value, the first valve, the second valve and the third valve are opened and when the detection values of the first humidity sensor and the second humidity sensor are higher than the set value, the first valve, the second valve and the third valve are closed, and the water temperature in the spraying hole and the second maintenance pipe is a constant value.

Optionally, the early maintenance stage comprises a heating stage, a heat preservation stage and a cooling stage;

in the heating stage, the water temperature in the spraying hole and the second curing tube is firstly quickly heated to 45 ℃ within 1 hour, and then slowly heated to 70 ℃ within 4 hours;

in the heat preservation stage, the water temperature in the spraying hole and the second maintenance pipe is kept at 70 ℃ within 24 hours;

in the cooling stage, the water temperature in the spraying holes and the second curing tube is slowly reduced to be stable in environment within 5 hours.

As described above, the ultra-large-volume prefabricated member maintenance device and method provided by the invention have at least the following beneficial effects:

the concrete curing device is suitable for curing large-volume and large-thickness concrete structures, and has the advantages of good curing quality and high curing efficiency, and can improve the hardness and strength of concrete. Specifically, the device comprises a die assembly and a curing frame. The mold assembly includes a first mold bladder and a second mold bladder and is ultimately formed into a structural hole of the preform body. The curing frame comprises a plurality of structural members and curing guard plates to form a curing cavity, and a first curing tube is arranged at the top of the curing cavity; the maintenance frame also comprises a transverse inner maintenance device which comprises a first sealing end and a second sealing end which are respectively connected with two ends of the second structure hole. The space between the curing frame and the prefabricated member body, the first structural hole and the second structural hole are filled with curing materials, and curing media flow through the first curing tube and the second curing tube. The curing material fully contacts with the outer surface and the inner cavity surface of the prefabricated member body, the curing material has the characteristics of moisture retention, ventilation and heat conduction, after the curing medium is introduced, the environment conditions required by the hydration reaction of the concrete can be quickly created and maintained through the maintenance and heat conduction characteristics of the curing material, the balance of the environment characteristics of the concrete is maintained, the uniform and quick hardening and forming of all parts of the concrete with large volume and large thickness are promoted, the curing period of the concrete is effectively reduced, and the quality of the finished product of the concrete is improved.

Drawings

Fig. 1 shows an overall schematic of the present invention.

FIG. 2 shows a schematic view of the preform body and mold bladder of the present invention.

Fig. 3 is an enlarged view of a portion of fig. 2 at a in accordance with the present invention.

FIG. 4 shows a schematic view of the preform body according to the present invention.

FIG. 5 shows a schematic view of a cross-sectional and transverse internal curing device for a preform body according to the present invention.

Fig. 6 is an enlarged view of a portion of fig. 5 at B in accordance with the present invention.

Fig. 7 is an enlarged view of a portion of fig. 5 at C in accordance with the present invention.

FIG. 8 is a schematic view showing an unsealed state of the elastic film of the present invention.

FIG. 9 is a schematic view of a bladder drive assembly according to the present invention.

Wherein: the first mold airbag 101, the second mold airbag 102, the end cap 103, the skeleton 42, the curing chamber 43, the first curing tube 431, the curing plate 432, the second curing tube 433, the trigger block 4331, the lateral inner curing device 44, the balance hole 4401, the water stop block 4402, the plug hole 4403, the pressure valve 4405, the elastic membrane 4406, the trigger end 4407, the water stop end 4408, the elastic member 4409, the first valve 4400, the tube body 441, the first humidity sensor 4411, the sealing ring 4413, the third valve 4414, the pressure sensor 4415, the bag driving assembly 41, the shaft 411, the injection passage 4111, the driving bag 412, the preform body 9, the first structure hole 91, and the second structure hole 92.

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

Please refer to fig. 1 to 9. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.

The following examples are given by way of illustration only. Various embodiments may be combined and are not limited to only what is presented in the following single embodiment.

1-5, the ultra-large-volume prefabricated member maintenance device provided by the invention is used for carrying out maintenance work on a prefabricated member body 9, wherein the prefabricated member body 9 is formed by pouring concrete slurry, and the device comprises a die assembly and a maintenance frame;

the mold assembly comprises a structural hole mold and a plurality of outer-layer templates, the outer-layer templates are enclosed to form a pouring area of the prefabricated member body 9, the structural hole mold comprises a first mold air bag 101 and a second mold air bag 102, the first mold air bag 101 is vertically arranged in the pouring area, the second mold air bag 102 is transversely arranged in the pouring area, two end sleeves 103 are respectively connected to two ends of the second mold air bag 102 and are fixed on the outer-layer templates, and the first mold air bag 101 and the second mold air bag 102 are pressurized and expanded to form an inner mold and finally form a first structural hole 91 and a second structural hole 92 of the prefabricated member body 9;

the maintenance frame comprises a plurality of structural members and a maintenance plate 432, the structural members are spliced to form a framework 42 of the maintenance frame, the maintenance plates 432 are spliced to form a maintenance cavity 43, the maintenance plate 432 is fixed on the framework 42, the maintenance plate 432 at the bottom of the maintenance cavity 43 is provided with water permeability, the bottom of the maintenance frame is provided with a water collecting structure, the top of the maintenance cavity 43 is provided with a first maintenance pipe 431, and the first maintenance pipe 431 is provided with a plurality of spraying holes;

The curing frame further includes a transverse inner curing means 44, the transverse inner curing means 44 including a first sealing end and a second sealing end, the first sealing end and the second sealing end being respectively connected to two ends of the second structural hole 92, and the exterior of the transverse inner curing means 44 being in communication with the second curing tube 433. The space between the curing frame and the prefabricated member body 9, the first structural holes 91 and the second structural holes 92 are filled with curing materials, curing media flow through the first curing pipe 431 and the second curing pipe 433, and the first curing pipe 431 is provided with a second valve.

In the above embodiment, the outer formworks may be designed and laid out according to the shape of the prefabricated member body 9, and the outer formworks enclose a pouring area of concrete slurry, in which a transverse and longitudinal structural hole mold is further provided. In general, in a large-sized concrete preform, it is necessary to design structural holes, which not only can reduce the dead weight of the concrete preform, but also can save materials without much influence on the strength of the preform. In view of the fact that these structural holes do not have high requirements for precision, but the shape, direction, cross section, etc. are often different, even in the case of a special shape, an air bag may be used as an inner membrane. In particular, in the present embodiment, the first mold bladder 101 and the second mold bladder 102 are inflated under pressure to form the vertical and horizontal internal molds, and of course, the vertical and horizontal do not mean absolute vertical or horizontal, and may have a certain inclination angle. Under the combined action of the outer Zhou Duokuai outer layer template and the structural hole die air bag, the prefabricated member body 9 is finally formed, and referring to fig. 4, a first structural hole 91 and a second structural hole 92 are formed in the prefabricated member body 9. After setting the template and the air bag, before pouring concrete slurry, the inner surface of the template and the outer surface of the air bag can be sprayed with a concrete release agent, wherein the concrete release agent is a substance smeared on the template for construction before concrete pouring, so that the template is not stuck on the concrete surface after pouring, is not easy to disassemble, or influences the smoothness of the concrete surface. The main function of the composite material is to form a layer of film on the surface of the formwork and the concrete to separate the formwork from the concrete, so that the composite material is also called a separating agent. During spraying, the end caps 103 should not be sprayed on the surfaces of the end caps 103, because the end caps 103 need to be integrally poured with concrete, after the concrete slurry is finally set, the outer-layer template, the first mold air bags 101 and the second mold air bags 102 need to be removed, but the end caps 103 at the two ends of the second mold air bags 102 are reserved for use in concrete curing. The setting time of concrete is divided into initial setting time and final setting time, wherein the initial setting time is the time required for cement to be mixed by adding water until cement paste begins to lose plasticity. The final setting time is the time required from the cement mix with water to the complete loss of plasticity of the cement slurry and onset of strength development. After the final setting of the concrete is finished, curing is needed, a template can be firstly arranged at other places for pouring, and after the final setting, the template is removed and the concrete is moved into a curing frame for curing; the template can also be directly arranged in the maintenance frame, and the maintenance is directly carried out in the maintenance frame after the template is disassembled; and the water permeability template can be used, and maintenance is carried out without dismantling the template. In some cases, to simplify the operation process, the bottom plate of the maintenance frame can be used as a bottom template, so that when the template is disassembled after final setting, only the side and top templates are required to be disassembled, the prefabricated member body 9 is not required to be lifted to disassemble the bottom template, and the operation process can be simplified. In this way, the curing plate 432 at the bottom of the curing cavity 43 needs to have a certain water permeability, or the area where the bottom surface exceeds the preform body 9 and the area opposite to the vertical cavity of the preform body 9 are provided with water permeable structures, so as to prevent water from being accumulated in the curing frame and not being discharged when the curing is watered, and the curing effect is affected. Correspondingly, be equipped with the water collecting structure in maintenance frame bottom, the water that the maintenance board 432 that the water collecting structure can collect from the bottom dropped, when the maintenance cycle is longer, the lower part water that sprays can be collected from the lower part, forms recycle, when using hot water maintenance, still can retrieve the heat that does not fully exchange, water conservation and energy saving. The dimensions of the curing frame should be taken into account before the preform body 9 is fitted into the curing frame, and there should also be a distance between the curing frame and the outer surface of the preform body 9, which distance should preferably be greater than half the wall thickness inside the preform body 9. Then, the space between the curing frame and the prefabricated member body 9, the first structural holes 91 and the second structural holes 92 are filled with curing materials, and the curing materials should cover a certain thickness of the upper surface of the prefabricated member body 9 in the top area. If the second structural holes 92 are smaller in diameter and are disposed entirely parallel to the horizontal transverse direction, external aids may be required to adequately fill the curing material therein, such as by pushing the curing material inward using rollers, or the like, and if the second structural holes 92 have a slope, the self-filling may be performed using the weight of the curing material itself. After the filling of the curing material in the second structural hole 92 is completed, the space between the curing frame and the prefabricated member body 9 and the first structural hole 91 are correspondingly filled with the curing material, and the filling process of the two areas is better operated. After the filling of the maintenance material is completed, the pipeline connection is started. The top of the curing cavity 43 is provided with a first curing tube 431, and a plurality of spraying holes are formed in the first curing tube 431; the transverse inner curing device 44 is arranged at two ends of the second structural hole 92 in a sealing way, the effect of the end sleeve 103 is exerted at the moment, the outer wall surface of the end sleeve 103 and the prefabricated member body 9 are solidified into a whole, the inner wall surface is more convenient to realize sealing connection than the concrete surface, and the second curing tube 433 is connected outside the transverse inner curing device 44. After the pipe connection is completed, a cover plate is further required to cover the top of the curing chamber 43. After the above-mentioned work is completed, a curing medium is introduced into the first curing tube 431 and the second curing tube 433, and according to different curing stages, the curing medium may be water or steam with different temperatures, and the curing material is a material with functions of absorbing water and guiding temperature, and in combination with construction scene and cost consideration, common materials on the site, such as sand or vermiculite, etc., may be used. The prefabricated member body 9 which is finally solidified is wrapped by sand, vermiculite or other curing materials, particularly for larger and thicker prefabricated members, the inner cavity structure of the prefabricated member body 9 is filled, the prefabricated member body 9 is fully contacted with each other, then water, steam or curing media with other additives are introduced into the prefabricated member body through the first curing tube 431 and the second curing tube 433, the temperature of the curing media is controlled by an external device, the prefabricated member body 9 is cured, the curing quality of the prefabricated member body 9 can be improved, and the final strength of the prefabricated member body 9 is further improved. In the related art, concrete curing adopts a water spraying curing mode, most construction units start water spraying on the concrete in the next day after pouring, and the concrete curing is carried out 2 to 5 times per day, so that cracks are numerous because of neither timeliness nor inadequacy. For the concrete moisture loss in the high-temperature drying season, if no corresponding measures are taken, the premature setting, plastic cracks, the strength reduction and durability reduction of the concrete are extremely easy to occur; for the prefabricated body with smaller volume, the prefabricated body is also cured by soaking water, but if the operation is improper, the strength of the surface of the prefabricated body can be reduced, because the surface of the prefabricated body is continuously corroded by water, the cohesive force among particles is weakened, and because of the limit of capillary water absorption of concrete, the water is difficult to enter the interior of the concrete with larger thickness, and the balanced curing is difficult to form; in some situations, steam curing is also used, but steam curing is costly because the boiling point of water is 100 degrees celsius, but the temperature required for curing concrete is somewhat lower, so that lower temperature steam needs to be generated, and corresponding supporting facilities are needed. In this embodiment, firstly, the limitation of the volume of the preform is eliminated, the structural hole is formed in the preform body 9 through the arrangement of the structural hole die, then the curing agent is filled, secondly, the curing agent is introduced into the first curing tube 431 and the second curing tube 433, a certain temperature can be adjusted according to the requirement, after the curing agent contacts with the curing agent, the curing agent rapidly obtains moisture and temperature from the curing agent, and the moisture and temperature are transferred to the preform body 9 through the contact with the preform body 9, especially in the inner cavity of the preform body 9, the curing agent is used for transferring the water and temperature required by curing into the preform body 9, so that the curing quality of the preform body 9 is effectively improved, especially for the preform with larger volume or thicker wall thickness, the second structural hole 92 can be filled with water or steam with pressure during curing, the penetration capability of the water and the temperature in the preform body 9 is enhanced, the water and the temperature can be enabled to enter the inside the preform body 9, and the control after the adjustment of the hydration reverse process is more facilitated, and the curing quality is improved. In addition, because the maintenance material has the effect of retaining water and accumulating temperature, along with the progress of hydration, prefabrication body 9 can be through single access maintenance medium at the later stage of maintenance to the reduction of moisture demand, lets in the maintenance medium again after the consumption of moisture, avoids the circumstances of bubble water and water wasting, and the maintenance material is the material of on-the-spot general use in this device moreover, and does not lead to the loss as the maintenance material, has low cost and high quality's advantage.

In this embodiment, referring to fig. 5-8, the first sealing end includes a pipe body, a sealing head and a sealing tail, and the sealing head and the sealing tail are disposed at two ends of the pipe body. Referring to fig. 7, the sealing head includes a filter screen, a pressure valve 4405 and an elastic membrane 4406, the pressure valve 4405 is connected to the end of the tube, the filter screen is disposed at the outlet side of the pressure valve 4405 to prevent the curing agent from reversely entering the pressure valve 4405, the elastic membrane 4406 is disposed at the other side of the pressure valve 4405, the elastic membrane 4406 is annularly sleeved on the tube, both ends of the elastic membrane 4406 are hermetically connected with the tube into a whole, and the tube wrapped by the elastic membrane 4406 is provided with a balance hole 4401. In the initial state, referring to fig. 8, the outer diameter of the elastic membrane 4406 is smaller than the outer diameter of the tube body, when the sealing head is inserted into the tube body, the sealing head will not contact with the inner diameter of the butt joint hole, the elastic membrane 4406 will not be lost, and when the pore diameters are close to each other, the sealing effect of the elastic membrane 4406 after expansion is better. Referring to fig. 7, the sealing tail comprises a sealing plug and an elastic piece 4409, wherein the sealing plug comprises a triggering end 4407 and a sealing end 4408, the triggering end 4407 and the sealing end 4408 are connected through a plug rod, a sealing block 4402 is arranged on a pipe body, a plug hole 4403 is arranged on the sealing block 4402, one end of the plug hole 4403 is matched with the section of the plug rod, the other end of the plug hole 4403 is matched with the section of the sealing end 4408, and the elastic piece 4409 is sleeved on the plug rod and is positioned between the triggering end 4407 and the sealing block 4402. In the initial state, the elastic member 4409 abuts against the trigger end 4407 and seals between the water stop end 4408 and the water stop block 4402. One end of the second maintenance pipe 433 is connected to the sealing tail, a trigger block 4331 is arranged in the second maintenance pipe 433, and when the second maintenance pipe 433 is connected, the trigger block 4331 is matched with the trigger end 4407, and a first valve 4400 is arranged on the second maintenance pipe 433.

In the above embodiment, the overall diameter of the sealing head is small before pressurization, and in particular, the elastic membrane 4406 for sealing is located on the inner side of the outer wall of the pipe body, and when the sealing head is inserted into any connecting hole with a small enough size, the elastic membrane 4406 does not contact with the wall surface of the connecting hole, friction is not generated, and the sealing head is not easy to damage. When the second curing tube 433 is connected, the trigger block 4331 jacks up the trigger end 4407 and overcomes the elasticity of the elastic member 4409, so that the plug holes 4403 communicate, and water or gas enters the tube body. Before the water pressure or the air pressure reaches the communication pressure of the pressure valve 4405, the elastic membrane 4406 gradually expands and finally contacts with the wall surface of the connecting hole, and when the pressure is larger, the contact is tighter, the sealing effect is better, and thus the sealing effect between the first sealing end and the second structure hole 92 and the end sleeve is formed. When the pressure is further increased, an excess portion of the pressure will be released through the pressure valve 4405 and water or gas will enter the second structural hole 92 until the pressure in the second structural hole 92 and the pressure in the elastic membrane 4406 are equalized. When needed, on the premise of keeping sealing connection, the second curing tube 433 can be removed first, at the moment of pulling out the second curing tube 433, the trigger block 4331 is separated from the trigger end 4407, at the moment of separating, a small amount of water in the elastic membrane 4406 flows out from the plug hole 4403, and then the plug hole 4403 is sealed and plugged by the water stop end 4408. Thus, a pressure difference is formed between the inside of the elastic membrane 4406 and the second structural hole 92, the pressure in the second structural hole 92 is greater, and the pressure in the second structural hole 92 pushes the end surface of the elastic membrane 4406 and presses it outward, so that the contact with the end sleeve 103 is tighter as a whole, further enhancing the sealing effect. In summary, the first sealing end in this embodiment has strong adaptability and good sealing effect, and once the connection is completed, the external pipe can be pulled out without affecting the sealing itself.

Referring to fig. 5 and 6, the second sealing end includes a filter screen, a first humidity sensor 4411, a temperature sensor, a sealing ring 4413 and a tube body 441, wherein the filter screen and the temperature sensor are disposed at the end of the tube body 441, the first humidity sensor 4411 includes two probes respectively disposed at the upper and lower sides of the end of the tube body 441, the two probes are inserted into the curing agent in the second structure hole 92, the water content in the curing agent can be evaluated by the potential difference between the two probes, and the sealing ring 4413 is annular and is sleeved on the tube body 441. The other end of the tube body 441 is further provided with a third valve 4414 and a pressure sensor 4415, and the pressure sensor 4415 is provided inside the third valve 4414. The filter screen can prevent the maintenance material from flowing into the maintenance medium loop along with gas or liquid, and the temperature sensor and the humidity sensor can detect the actual temperature of the maintenance material and the maintenance medium, because in the maintenance process, even if the temperature of the introduced maintenance medium can be controlled, the temperature of the maintenance medium around and inside the prefabricated member body 9 is possibly different from the maintenance medium due to the heat exchange condition, and after the temperature sensor senses, the temperature of the introduced maintenance medium is dynamically adjusted, so that the accuracy of the actual maintenance temperature can be improved, and the maintenance effect is improved. In the early stages of curing, continuous passage of a flowing curing medium, even one with high temperature and pressure, may be required. In the latter stage of curing, the hydration reaction of the prefabricated member body 9 is very little and slow, at this time, normal temperature and pressureless water can be used as curing medium, after the curing medium is introduced once, the moisture is kept by the curing material, then the moisture change is detected by the moisture sensor 4411, the next water injection work is automatically performed, and correspondingly, each valve can be set as an electromagnetic valve which can be controlled by an automatic system.

Referring to fig. 9, the curing frame further includes a plurality of sets of bag driving assemblies 41, and the bag driving assemblies 41 include shafts 411 and driving bags 412. The two ends of the shaft rod 411 are rotatably connected to the maintenance frame, the driving bag 412 is coated on the shaft rod 411, the two ends of the driving bag 412 are in sealing connection with the shaft rod 411, an injection pressure channel 4111 is formed in the shaft rod 411, a connecting port is formed in a coating section of the shaft rod 411, the connecting port is communicated with the inner area of the driving bag 412 and the injection pressure channel 4111 of the shaft rod 411, and the end part of the shaft rod 411 is communicated with an external injection pressure system. In this embodiment, the bag driving component 41 plays a supporting role on the prefabricated member body 9, through the control of the inflation pressure difference between the multiple bag driving components 41, the prefabricated member body 9 can be inclined at a certain angle on the multiple bag driving components 41, and correspondingly, the second structural hole 92 which is transversely formed in the prefabricated member body 9 can be inclined at a certain angle, under this state, if the second structural hole 92 is filled with the curing material, the curing material will automatically roll down and automatically fill the second structural hole 92 under the action of gravity, and compared with the second structural hole 92 in a transverse state, the whole construction process is more convenient and more reliable, and the condition that whether the curing material is filled into the second structural hole 92 is avoided. The construction is convenient, and simultaneously, the guarantee is also improved for the subsequent maintenance work, so that the maintenance work is more reliable, and the strength and the quality of the prefabricated member body 9 are more facilitated.

The embodiment provides a curing method for an ultra-large-volume prefabricated member, which can adopt the curing device, and comprises the following steps:

and a prefabrication final setting step, namely assembling an outer layer template and a structural hole die of the prefabrication in a maintenance frame, applying pressure to the first die air bag 101 and the second die air bag 102 to expand and form the prefabrication, and then pouring the mixed concrete slurry into the die to wait for the concrete slurry to be set. In the step, the construction convenience is excellent particularly for the prefabricated body with an inner cavity, particularly a relatively irregular inner cavity structure;

and in the curing preparation step, after the final setting of the concrete slurry is completed, the outer layer template and the structural hole mould of the prefabricated member are removed, but the end sleeve 103 is reserved, a second humidity sensor is arranged at the bottom of the curing cavity, the first structural hole 91 and the second structural hole 92 are filled with curing materials, two ends of the first structural hole 91 are respectively in butt joint with the first sealing end and the second sealing end, and the gaps between the curing frame and the prefabricated member are filled with the curing materials. In the step, the surface layer of the prefabricated member body 9 is also filled with a curing material with a certain thickness;

in the curing step, the opening and closing states of the first valve 4400, the second valve and the third valve 4414 are switched, when the first valve 4400, the second valve and the third valve 4414 are opened, the spraying holes spray water downwards from the top of the curing frame, and the second curing tube 433 injects water into the second structural hole 92 through the first sealing end.

In the method, the concrete curing mechanism is as follows: the hardening mechanism of cement is that the cementing material particles in cement and water carry out hydration reaction, and along with the progress of hydration process, the quantity of generated hydration products is increased, macropores in concrete are gradually filled by the hydration products to become small holes which are not communicated with each other, the pore diameter is smaller and smaller, the internal structure is further compact, and then indexes such as the compressive strength of the concrete are improved. If the moisture is insufficient or the temperature is insufficient, the pozzolanic activity of the cement cannot be significantly stimulated, and a large number of unreacted cement particles exist in the matrix, which means that the preform body 9 is not effectively cured, and the strength of the preform body will be difficult to meet the requirement, and even cracks may occur. In this embodiment, through the filling of maintenance material to prefabricate member body 9 outward appearance and inner chamber, utilize the maintenance material to absorb water and moisturize and heat conduction's characteristic, bring the required water of hydration and temperature into prefabricate member body 9 constantly, fully activate the activity of cementing material, keep whole prefabricate member body 9 outward appearance, inner chamber, even inside moisture and temperature are sufficient and balanced, promote the going on of hydration reaction of prefabricate member body 9, let hydration product fully fill prefabricate member body 9's base member, accelerate the efficiency of hydration reaction, improve the equilibrium of hydration reaction of each position of prefabricate member body 9, be favorable to shortening the cycle of maintenance, improve the quality of maintenance.

Further, in this embodiment, the method further includes a detecting step, where the detecting step adopts a water pressure detecting mode or an air pressure detecting mode. The method comprises the following steps: the first and third valves 4400 and 4414 are opened and water or air is filled into the second structure hole 92, and after the pressure is stabilized, the first and third valves 4400 and 4414 are closed and the pressure change in the second structure hole 92 is monitored. The pore volume and the porosity in the preform body 9 are indexes for measuring the quality of the preform body, and the pore diameter is considered to be harmless pores with the diameter of <20 nm; the aperture is 20-100 nm as less harmful holes; the aperture is 100-200 nm as harmful hole; the pore diameter is more harmful and the lower the pore volume and the porosity is, the higher the compressive strength is. The pore volume and porosity gradually decrease as the hydration reaction proceeds in the preform body 9. At a later stage of the curing phase, the quality of the preform body 9 can be assessed using water pressure and air pressure. On one hand, the completion of the hydration process can be judged in advance, and the maintenance of the preform is finished in advance and put into use, so that the time is saved; on the other hand, the method can also be used for evaluating maintenance quality, identifying unqualified prefabricated member bodies 9, identifying risks in advance and avoiding damage to bearing capacity of a building structure. The principle of the method in this embodiment is that water pressure or air pressure is filled into the second structural hole 92 and both ends are sealed, then the pressure sensor detects the pressure change, and by evaluating the relation of the pressure loss with time, whether the hole volume and the porosity are qualified or not can be judged. For the situation that the comparison standard is difficult to obtain by using theoretical calculation, the preform which is detected to be qualified by special equipment can be actually measured, and the loss condition of the pressure in the qualified preform along with time can be obtained as the comparison standard.

In this embodiment, the curing step includes an early curing stage and a later curing stage.

In the early maintenance stage: the first valve 4400, the second valve and the third valve 4414 are continuously opened, and the water temperatures in the spraying hole and the second curing tube 433 are changed values; in the post-curing stage: the first, second and third valves 4400, 4414 are opened under the condition that they are opened when the detected values of the first and second humidity sensors 4411, 4411 are lower than the set value, and closed when they are higher than the set value, and the water temperatures in the spouting holes and the second curing tube 433 are constant. In the embodiment, the time of the early curing stage is shorter, a continuous curing medium with higher temperature can be provided, and the hydration reaction is fully activated, so that the strength of the concrete is rapidly increased; in the later curing stage, the curing time is longer, the particles of the cementing material which do not carry out hydration reaction in the cement are fewer, and the continuous introduction of the curing medium with higher temperature is difficult to obviously promote the hydration reaction. In the embodiment, through the division of two stages, the aims of full hydration, efficient hydration, energy consumption reduction and waste reduction can be achieved, and the aims of cost reduction and efficiency enhancement are achieved.

Further, in this embodiment, the early maintenance stage includes a temperature raising stage, a heat preservation stage, and a temperature lowering stage;

in the heating stage, the water temperature in the spraying hole and the second curing tube 433 is firstly quickly heated to 45 ℃ within 1 hour, and then slowly heated to 70 ℃ within 4 hours;

in the heat preservation stage, the water temperature in the spraying hole and the second maintenance pipe 433 is kept at 70 ℃ within 24 hours;

in the cooling stage, the water temperature in the ejection hole and the second maintenance pipe 433 is slowly reduced to the environment stability within 5 hours.

In the above embodiment, the temperature rising stage is firstly to quickly raise the temperature to a moderate temperature and then slowly raise the temperature to a final heat preservation temperature, and the similar temperature lowering stage also adopts a slow temperature lowering mode, so that the curing temperature has a great influence on the reaction rate of the cementing material, if the temperature rising is quick, local great temperature difference between the inside and the outside of the prefabricated member body 9 can be caused, the progress of internal and external hydration reactions is different, further structural stress is generated, and severe cracks even possibly occur. In the early curing stage, through high temperature heat preservation at 70 ℃, sufficient curing medium is provided for the inner surface and the outer surface of the prefabricated member body 9, and better conduction and retention mechanisms are provided by curing materials, so that the hydration efficiency and consistency of concrete can be effectively improved, the curing period can be saved, and the curing quality can be improved. After the heat preservation stage is finished, the temperature reduction stage is carried out, and after the temperature is reduced to the ambient temperature, the post-curing stage is carried out, so that the long-term curing is carried out. In the prior art, the general curing period is 28 days, but in the embodiment, the curing period can be shortened to a few days, the early curing stage can be generally completed within two days, the detection step can be regularly performed after the early curing stage is entered, the state of the prefabricated member body 9 is evaluated, and once the prefabricated member body 9 is detected to be qualified, the prefabricated member body can be put into use without waiting for about 28 days as in the prior art. Compared with the prior art, the method obviously improves the maintenance quality and shortens the maintenance period.

In summary, the invention effectively overcomes various defects in the prior art, and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. An oversized prefabricated member curing means for carry out maintenance work to prefabricated member body (9), prefabricated member body (9) are pour by concrete slurry and are formed, its characterized in that:

comprises a die assembly and a maintenance frame;

the mold assembly comprises a structure hole mold and a plurality of outer-layer templates, wherein the outer-layer templates are enclosed to form a pouring area of the prefabricated member body (9), the structure hole mold comprises a first mold air bag (101) and a second mold air bag (102), the first mold air bag (101) is vertically arranged in the pouring area, the second mold air bag (102) is transversely arranged in the pouring area, two end sleeves (103) are respectively connected to two ends of the second mold air bag (102) and are fixed on the outer-layer templates, and the first mold air bag (101) and the second mold air bag (102) are pressurized and expanded to form an inner mold and finally formed into a first structure hole (91) and a second structure hole (92) of the prefabricated member body (9);

The maintenance frame comprises a plurality of structural members and maintenance plates (432), the structural members are spliced to form a framework (42) of the maintenance frame, the maintenance plates (432) are spliced to form a maintenance cavity (43), the maintenance plates (432) are fixed on the framework (42), the maintenance plates (432) at the bottom of the maintenance cavity (43) are provided with water permeability, the bottom of the maintenance frame is provided with a water collecting structure, the top of the maintenance cavity (43) is provided with a first maintenance pipe (431), and the first maintenance pipe (431) is provided with a plurality of spraying holes;

the maintenance frame further comprises a transverse inner maintenance device (44), the transverse inner maintenance device (44) comprises a first sealing end and a second sealing end, the first sealing end and the second sealing end are respectively connected to two ends of the second structural hole (92), and the outer part of the transverse inner maintenance device (44) is communicated with a second maintenance pipe (433);

the space between the curing frame and the prefabricated member body (9) and the first structure holes (91) and the second structure holes (92) are filled with curing materials, curing media flow through the first curing tube (431) and the second curing tube (433), and a second valve is arranged on the first curing tube (431).

2. An oversized preform curing device as in claim 1 wherein:

The first sealing end comprises a pipe body, a sealing head and a sealing tail, and the sealing head and the sealing tail are arranged at two ends of the pipe body;

the sealing head comprises a filter screen, a pressure valve (4405) and an elastic membrane (4406), wherein the pressure valve (4405) is connected to the tail end of the pipe body, the filter screen is arranged on the outlet side of the pressure valve (4405), the elastic membrane (4406) is arranged on the other side of the pressure valve (4405), the elastic membrane (4406) is annularly sleeved on the pipe body, the two ends of the elastic membrane (4406) are hermetically connected with the pipe body into a whole, a balance hole (4401) is formed in the pipe body wrapped by the elastic membrane (4406), and in an initial state, the outer diameter of the elastic membrane (4406) is smaller than that of the pipe body;

the sealing tail comprises a water stop plug and an elastic piece (4409), the water stop plug comprises a trigger end (4407) and a water stop end (4408), the trigger end (4407) and the water stop end (4408) are connected through a plug rod, a water stop block (4402) is arranged on the pipe body, a plug hole (4403) is arranged on the water stop block (4402), one end of the plug hole (4403) is matched with the cross section of the plug rod, the other end of the plug hole is matched with the cross section of the water stop end (4408), the elastic piece (4409) is sleeved on the plug rod and is positioned between the trigger end (4407) and the water stop block (4402), and in an initial state, the elastic piece (4409) props against the trigger end (4407) and seals the water stop end (4408) and the water stop block (4402);

One end of the second maintenance pipe (433) is connected to the sealing tail, a trigger block (4331) is arranged in the second maintenance pipe (433), when the second maintenance pipe is connected, the trigger block (4331) is matched with the trigger end (4407), and a first valve (4400) is arranged on the second maintenance pipe (433).

3. An oversized preform curing device as in claim 2 wherein:

the second sealing end comprises a filter screen, a first humidity sensor (4411), a temperature sensor, a sealing ring (4413) and a pipe body (441), wherein the filter screen and the temperature sensor are arranged at the tail end of the pipe body (441), the first humidity sensor (4411) comprises two probes, and the sealing ring (4413) is annular and is sleeved on the pipe body (441);

the other end of the pipe body (441) is further provided with a third valve (4414) and a pressure sensor (4415), and the pressure sensor (4415) is arranged on the inner side of the third valve (4414).

4. An oversized preform curing means as claimed in claim 1 wherein the curing material is a material having water absorbing and heat conducting functions.

5. An oversized preform curing means as claimed in claim 1 wherein the curing medium is steam or water.

6. An oversized preform curing device as in claim 1 wherein:

the curing frame further comprises a plurality of sets of pouch drive assemblies (41), the pouch drive assemblies (41) comprising a shaft (411) and a drive pouch (412);

the utility model discloses a maintenance frame, including axostylus axostyle (411), both ends rotate connect in maintenance frame, drive bag (412) cladding in axostylus axostyle (411) and both ends all with axostylus axostyle (411) sealing connection, axostylus axostyle (411) inside is equipped with injection channel (4111), axostylus axostyle (411) by drive bag (412) cladding section is equipped with the connector, the connector intercommunication drive bag (412) inside region with injection channel (4111) of axostylus axostyle (411), axostylus axostyle (411) tip and outside injection system intercommunication.

7. A method of curing an oversized preform using the curing apparatus of claim 3, comprising the steps of:

a prefabricated member final setting step, namely assembling an outer layer template and a structural hole mold of the prefabricated member in the maintenance frame, applying pressure to the first mold air bag (101) and the second mold air bag (102) to expand and form the prefabricated member, and then pouring the mixed concrete slurry into the mold to wait for solidification of the concrete slurry;

After the final setting of the concrete slurry is completed, removing an outer layer template and a structural hole die of the prefabricated member, but keeping the end sleeve (103), arranging a second humidity sensor at the bottom of the curing cavity (43), filling curing materials into the first structural hole (91) and the second structural hole (92), respectively butting two ends of the first structural hole (91) with the first sealing end and the second sealing end, and filling the curing materials into a gap between the curing frame and the prefabricated member;

and in the maintenance step, the opening and closing states of the first valve (4400), the second valve and the third valve (4414) are switched, when the first valve (4400), the second valve and the third valve (4414) are opened, the spraying holes spray water downwards from the top of the maintenance frame, and the second maintenance pipe (433) injects water into the second structural hole (92) through the first sealing end.

8. A method of curing an oversized preform as in claim 7 further comprising the step of detecting, the step of detecting employing a hydrostatic detection mode or an barometric detection mode;

the method comprises the following steps: and opening the first valve (4400) and the third valve (4414), filling water or air into the second structure hole (92), closing the first valve (4400) and the third valve (4414) after the pressure is stable, and monitoring the pressure change in the second structure hole (92).

9. A method of curing an oversized preform as in claim 7 wherein the curing step comprises an early curing stage and a later curing stage;

in the early maintenance stage: the first valve (4400), the second valve and the third valve (4414) are continuously opened, and the water temperature in the spraying hole and the second maintenance pipe (433) is a change value;

in the post-curing stage: the first valve (4400), the second valve and the third valve (4414) are opened according to the condition that when the detection values of the first humidity sensor (4411) and the second humidity sensor are lower than a set value, the first valve is opened, when the detection values of the first humidity sensor and the second humidity sensor are higher than the set value, the first valve is closed, and the water temperature in the spraying hole and the water temperature in the second maintenance pipe (433) are constant.

10. A method of curing an oversized preform as in claim 9 wherein:

the early maintenance stage comprises a heating stage, a heat preservation stage and a cooling stage;

in the heating stage, the water temperature in the spraying hole and the second curing tube (433) is firstly quickly heated to 45 ℃ within 1 hour, and then slowly heated to 70 ℃ within 4 hours;

in the heat preservation stage, the water temperature in the spraying hole and the second maintenance pipe (433) is kept at 70 ℃ within 24 hours;

In the cooling stage, the water temperature in the spraying hole and the second curing tube (433) is slowly reduced to be environment-stable within 5 hours.