CN108908673B - Autoclaved curing method for prefabricated T beam in high-cold low-pressure area - Google Patents

Abstract

The invention discloses an autoclaved curing method for a prefabricated T beam in a high-cold low-pressure area, which comprises the following steps of putting the T beam in a curing shed: standing: keeping the temperature in the curing shed at 10-20 ℃ and keeping the temperature for 2-6 h; and (3) heating: raising the temperature in the maintenance shed to 40-50 ℃, and preserving the heat until the strength of the concrete reaches the specified cooling demolding strength; cooling: the temperature in the maintenance shed is reduced to the temperature difference between the inside and the outside of the shed which is less than or equal to 20 ℃. The concrete surface and deep layer cracking problem caused by large temperature difference change and large temperature difference in the concrete inner surface is solved, and meanwhile, the construction period and the cost are greatly saved.

Description

Autoclaved curing method for prefabricated T beam in high-cold low-pressure area

Technical Field

The invention relates to a boiler, in particular to an autoclaved curing method for a prefabricated T beam in a high-cold low-pressure area.

Background

High and cold low-pressure areas mostly belong to temperate zone and cold temperate zone monsoon climate, the annual temperature difference is small, the daily temperature difference is large, the newly poured concrete generates hydration heat after initial setting, the internal temperature can reach 46 ℃, and at the moment, if the external temperature cannot be guaranteed, the concrete can generate temperature difference cracks. The existence of cracks affects the durability and mechanical properties of concrete. Therefore, the control of the temperature difference between the interior of the concrete and the outside in high altitude and high cold areas is particularly critical. Since the temperature gradually rises with time after concrete pouring, the external temperature in alpine regions is too low (especially in winter). After the temperature difference between the inside and the outside of the concrete is too large, a large number of temperature difference cracks are generated on the surface of the concrete, and the durability and the mechanical property of the concrete are influenced. The problem of overlarge temperature difference cannot be solved in the aspects of raw materials and mixing ratio, so that the external temperature must be changed to ensure the relative balance of the internal and external temperature differences of the concrete, and the problem of surface temperature difference cracks of the concrete is solved.

The traditional spray curing method only solves the shrinkage crack caused by surface hydration heat in the initial setting process of concrete, and the temperature difference between the inside and the outside of newly poured concrete is increased due to the lower water temperature in high-cold and low-pressure areas, so that the expansion of the temperature difference crack is promoted. The boiler for coal, gas, oil and firewood has the advantages of low combustion speed, incapability of adjusting temperature difference as soon as possible, limited resources and incapability of regeneration, great environmental pollution after combustion, more personnel investment in the operation process, high operation cost and long maintenance period and low work efficiency. In order to overcome the defects of the traditional process, a novel autoclaved curing method for the prefabricated T-shaped beam in the high-cold low-pressure area is extremely important.

Disclosure of Invention

The invention aims to provide an autoclaved curing method for a prefabricated T beam in a high-cold low-pressure area, which solves the problems that water is directly sprayed on the T beam in the traditional process, and the temperature difference between the inside and the outside of newly poured concrete is increased due to the lower water temperature in the high-cold low-pressure area, so that the expansion of a temperature difference crack is promoted.

In order to solve the technical problems, the invention adopts the following technical scheme:

the autoclaved curing method for the prefabricated T beam in the high-cold low-pressure area is characterized by comprising the following steps of putting the T beam into a curing shed:

standing: keeping the temperature in the curing shed at 10-20 ℃ and keeping the temperature for 2-6 h;

and (3) heating: raising the temperature in the maintenance shed to 40-50 ℃, and preserving the heat until the strength of the concrete reaches the specified cooling demolding strength;

cooling: the temperature in the maintenance shed is reduced to the temperature difference between the inside and the outside of the shed which is less than or equal to 20 ℃.

Preferably, in the temperature increasing step, the temperature is increased at a speed of less than or equal to 15 ℃/h.

Preferably, in the cooling step, the temperature is reduced for 3 to 5 hours at a speed of 4 to 6 ℃/h, and then the temperature is reduced to be less than or equal to 20 ℃ between the internal temperature difference and the external temperature difference of the curing penc at a speed of 9 to 11 ℃/h.

Preferably, the specified cooling demolding strength is 75-85% of the designed strength of the concrete.

Preferably, the system comprises a boiler and a heat preservation shed communicated with a steam outlet pipe of the boiler, wherein,

the boiler comprises a hearth and a flue gas header communicated with the hearth;

a fuel inlet and a furnace ash outlet are arranged on the hearth, a transverse water pipe is arranged in the hearth, and the inlet end of the transverse water pipe is connected with a water tank;

the smoke collection box is provided with a smoke outlet, a steam collection box is arranged in the smoke collection box, the steam collection box is communicated with the outlet of the transverse water pipe, the steam collection box is provided with a steam outlet pipe, and the outlet of the steam outlet pipe penetrates out of the smoke collection box and is outside the smoke collection box;

the heat preservation shed comprises a support frame, heat preservation and moisture preservation cloth covering the support frame and serving as a shed roof and a shed side wall, and at least one door located on the shed side wall, wherein an outlet of the steam outlet pipe is located in the heat preservation shed.

The autoclaved curing method for the prefabricated T beam in the high-cold low-pressure area can be a vertical shell-and-pan boiler. The boiler using coal, gas, oil and firewood has slow burning speed, limited resource, no regeneration, less environmental pollution, high operation cost, long maintenance period and low work efficiency, and is suitable for use as biomass fuel. The fuel is thrown into at furnace inlayer form burning by the furnace gate, has arranged horizontal water pipe in the furnace, and high temperature flue gas transversely erodees horizontal water pipe and carries out abundant convection heat transfer, then gets into the flue gas collection box, sets up the collection steam chest in the flue gas collection box, and the flue gas erodees the collection steam chest, has reduced the flue gas temperature, improves steam temperature, and the flue gas is discharged into the atmosphere at last. The boiler has strong load adaptability, can safely and normally operate within the range of 60-100% of rated load, and has steam temperature of over 170 ℃.

The concrete prefabricated part or the T-shaped beam is arranged in the heat preservation shed, the concrete prefabricated part or the T-shaped beam can conveniently enter and exit from the door due to the existence of the supporting frame, the heat preservation and moisture preservation cloth can slow down the loss speed of the surface temperature or the humidity of the concrete or the T-shaped beam, the difference between the internal temperature and the external temperature and the humidity is reduced, and the problem of temperature difference cracks on the surface of the concrete is solved to a certain extent. Although the curing cloth can reduce the loss of the temperature and the humidity of the surface of the concrete, the curing cloth is still difficult to be consistent with the temperature and the humidity of the inside, so a steam pipe is arranged to convey the steam into the shed, the temperature and the humidity of the surface of the concrete are increased, and the temperature and the humidity of the surface and the inside of the concrete are uniformly distributed as much as possible.

Preferably, a first temperature monitoring device is arranged inside the material in the heat preservation shed, a second temperature monitoring device is arranged in the heat preservation shed, a third temperature monitoring device and a flow regulating device are arranged on the steam outlet pipe, and the first temperature monitoring device, the second temperature monitoring device, the third temperature monitoring device and the flow regulating device are all connected with the single chip microcomputer.

The first temperature monitoring device, the second temperature monitoring device and the third temperature monitoring device can be three thermometers which are all connected with the single chip microcomputer, the single chip microcomputer calculates the temperature difference inside and outside the concrete through measuring the temperature in the heat preservation shed and the temperature inside the concrete, and then the flow of the steam is adjusted according to the temperature of the steam, so that the temperature in the heat preservation shed is relatively stable, and the temperature inside and outside the concrete is consistent.

The support frame in this application can be arbitrary structure, as long as can support the heat preservation cloth of moisturizing and can cover the concrete prefabricated part and establish the heat preservation cloth of moisturizing below, can slow down scattering and disappearing of temperature, humidity can. Wherein, the support frame lower extreme also can set up the wheel, makes things convenient for the removal of insulation shed, during the use, can push away the insulation shed to the department of T type roof beam and carry out the maintenance to it.

Preferably, a flow distribution block is arranged below the transverse water pipe and is fixed in the hearth through a connecting rod;

and a flue gas channel is formed between the flow dividing block and the inner wall of the hearth.

The flow dividing block plays a role in dust blocking and flow dividing, a large amount of soot is generated when fuel is burnt, and the flow dividing block blocks part of the soot which is separated from the soot in the flue gas channel.

Preferably, the lower surface of the flow distribution block gradually inclines upwards from the middle to the periphery, so that the rising resistance of the smoke is reduced.

Preferably, the upper surface of the diverter block is gradually inclined downwards from the middle to the periphery, so that the ash is prevented from accumulating on the upper surface of the diverter block to a certain extent.

Preferably, a dust baffle plate capable of turning downwards is arranged above the flue gas channel, one side of the dust baffle plate is arranged on the furnace wall through a rotating shaft, and the side far away from the furnace wall is supported by a spring fixed on the flow dividing block or the connecting rod below.

The dust board is arranged at a height lower than that of the transverse water pipe and above the flue gas channel, so that the dust board can further play a role in blocking dust. In addition, one side of the dust blocking plate, which is far away from the furnace wall, can slightly tilt upwards, when too much soot falls on the dust blocking plate, the pressure borne by the spring is increased, one side of the dust blocking plate, which is far away from the furnace wall, can be inclined, the furnace soot slides off, the dust blocking plate resets, and the circulation is continuous.

Preferably, the dust baffle plates are more than two and are arranged on the furnace wall along the circumferential direction.

More than two dust boards are enclosed into a ring, and the smoke upwards washes the transverse water pipe more intensively from the middle part of the ring enclosed by the dust boards, so that the heat exchange efficiency is improved.

Preferably, a vibration cavity is arranged in the dust guard plate, and a hitting ball is arranged in the vibration cavity.

When the dust board is in the normal position, the ball of striking is close to the oven, increase along with ash on the dust board, the inboard of dust board is downward gradually, when inboard height is less than the height that is close to the outside of oven, the ball of striking can the landing to the one side of keeping away from the oven, through hitting the device between the inboard in batting and vibrations chamber, make the smoke and dust landing on the dust board, then the dust board resets, the impact shakes the chamber and is close to one side of oven, because rigid connection between dust board and the oven, the oven also can shake thereupon, the ash that will adhere to on the oven shakes and falls, kill two birds with one another.

Preferably, the door comprises a door frame and a door curtain, a roller driven by a pull rope is arranged on the door frame, and the upper edge of the door curtain is fixed on the roller along the axial direction of the roller;

the door frame is provided with a sleeve, the roller is installed in the sleeve through a bearing, and a notch for the door curtain to enter and exit is formed below the sleeve.

The door curtain is fixed on the roller, and the stay cord drives the roller pivoted in-process door curtain can twine in the pivot or release from the pivot to realize opening and closing of door. The roller sets up in the sleeve, prevents on the one hand that the roller from receiving to collide with, and on the other hand construction site dust probably is great, if there is not the sleeve, and the dust is long-term to be accumulated between roller and stay cord, probably appears the card pause phenomenon between stay cord and the roller.

Preferably, a down-falling rod is arranged at the bottom end of the door curtain along the edge of the door curtain;

the door curtain is characterized in that sliding grooves are formed in two vertically arranged sides of the door frame, sliding blocks capable of sliding in the sliding grooves are arranged on the door curtain or the drop rod, and the width of a groove opening of each sliding groove is smaller than the diameter of each sliding block.

Or the construction site has wind, the lower end of the door curtain can float without a heavy object, and the loss of the humidity and the temperature in the shed is caused. The slider can slide in the spout, reduces the gap between door curtain and the door frame, reduces the speed that scatters and disappears of temperature, humidity in the canopy.

Preferably, the entrance at the top end of the sliding chute is provided with a guide part, and the width of the guide part is reduced from top to bottom in sequence.

The spout top sets up the guide part, and when the slider got into the spout, the guide part can play the effect that a guide slider aimed at the spout, prevents that slider and spout from not aiming at the phenomenon of the slider card that leads to in the spout entrance.

The core technology and principle of the method are a green biological low-pressure high-temperature autoclaved curing system which mainly comprises a biological combustor and low-pressure high-temperature boiler steam generator, an autoclaved pipeline system, a heat-insulating shed and an intelligent temperature measuring system. The specific operation steps are as follows: after the precast beam is poured, the boiler is connected, the biomass burner is connected, the fuel bin is filled with fuel, a fire outlet of the burner is aligned to the combustion bin of the boiler, a steam pipeline is arranged in time, the beam body is covered by closed tarpaulin, the water level line in the boiler is checked, after the preparation work is finished, an ignition switch of the burner is started, the rising condition of the water temperature is observed, a steam supply valve can be opened to supply steam when the water temperature reaches 90 ℃, the internal temperature and the peripheral environment temperature of newly poured concrete are measured, if the internal and external temperature difference is greater than 20 ℃, steam is supplied in time, the balance of the internal and external temperature difference is ensured, if the air temperature is too high, the combustion gear of the burner is adjusted in time, the combustion speed is reduced, the temperature is monitored at any time in.

Compared with the prior art, the invention has the beneficial effects of at least one of the following:

economic benefits are as follows:

saving the construction period, prefabricating 610T beams in a T beam prefabrication field No. 2 of the project department of the fragrant high-speed second work area, laying 25 prefabrication pedestals, performing 14-day-one-cycle maintenance according to the traditional method, prefabricating 50T beams per month, and completing the maintenance in 366 days. The biomass fuel steam curing can be shortened to 7 days and one cycle, the construction period of each base is saved by 7 days, and the total construction period is saved by 183 days;

the cost is saved, the total cost is calculated according to one traditional coal boiler (1 ton), 40KG is consumed by coal per hour, 960KG is consumed by coal per 24 hours, 1300 yuan/ton is local price, 1248 yuan is consumed by fuel per day, 2 yuan is consumed by boiler burning workers, 150 yuan/worker day, the total cost of coal boiler maintenance is 1248 yuan +2 × 150 yuan =1548 yuan, the new process is adopted, 20KG is consumed by biomass fuel per hour, 480KG is consumed by coal per 24 hours, 1250 yuan/ton is local price, 600 yuan is consumed by fuel per day, 1 yuan is consumed by boiler burning workers, 150 yuan/worker day and the total cost of biomass boiler maintenance is 600 yuan +150 yuan =750 yuan, compared with the cost saved by 750=798 yuan per day, the total saved amount is 79 798 × 183=146034 yuan per 183 days in the total required construction period;

social benefits, the steam curing construction method of the biomass fuel boiler is applied to the project, so that the construction period is saved to the maximum extent while the cost investment of manpower, materials and the like is reasonably optimized. The problems that the precast concrete is not maintained in place in high-altitude and high-cold areas, concrete temperature difference cracks are not caused in time, and the traditional maintenance temperature control is slow in adjustment, difficult to control, large in environmental pollution, high in operation cost and the like are solved. The construction method is popularized and applied by our company, and the construction and supervision units can agree and comment well, so that the social benefit is good.

The biomass fuel boiler is convenient to control the burning speed slowly, the temperature difference can be adjusted as soon as possible, the fuel resource can be regenerated, the environmental pollution after burning is small, and the operation cost is low. Comprehensive comparison shows that the biomass fuel low-pressure high-temperature boiler is used for curing the prefabricated T-beam concrete in high altitude and high cold regions, the problem of cracking of the surface and deep layers of the concrete caused by large temperature difference change and large temperature difference in the inner surface of the concrete is solved, and meanwhile, the construction period and the cost are greatly saved.

The matching of the flow dividing block and the dust blocking plate improves the heat exchange efficiency on one hand, reduces the content of solid particles in the discharged flue gas to a certain extent on the other hand, and reduces the accumulation of the soot on the cross-bar pipes or the furnace wall.

The steam pipe is arranged to convey steam into the shed, so that the temperature and the humidity of the surface of the concrete are increased, and the temperature and the humidity of the surface and the inside of the concrete are uniformly distributed as much as possible.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic view showing the structure of the boiler according to the present invention.

FIG. 3 is a schematic view showing the structure of the thermal insulation shed according to the present invention.

Fig. 4 is a schematic view showing the connection between the roller and the pull cord according to the present invention.

FIG. 5 is a schematic view of a door curtain of the present invention.

Fig. 6 is a schematic view of the slider and runner of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1:

the embodiment provides an autoclaved curing method for a prefabricated T beam in a high-cold low-pressure area, which comprises the following steps of placing the T beam in a curing shed:

standing: keeping the temperature in the maintenance shed at 10 ℃ and keeping the temperature for 2-6 h;

and (3) heating: raising the temperature in the maintenance shed to 50 ℃ at the speed of 15 ℃/h, and preserving the heat until the strength of the concrete reaches 75% of the designed strength of the concrete;

cooling: the temperature is reduced for 5 hours at the speed of 4 ℃/h, and then the temperature is reduced at the speed of 11 ℃/h until the temperature difference between the inside and the outside of the curing peng is less than or equal to 20 ℃.

Example 2:

the embodiment provides an autoclaved curing method for a prefabricated T beam in a high-cold low-pressure area, which comprises the following steps of placing the T beam in a curing shed:

standing: keeping the temperature in the maintenance shed at 20 ℃ and keeping the temperature for 2 h;

and (3) heating: raising the temperature in the maintenance shed to 40 ℃ at the speed of 10 ℃/h, and preserving the heat until the strength of the concrete reaches 85% of the designed strength of the concrete;

cooling: the temperature is reduced for 3 hours at the speed of 6 ℃/h, and then the temperature is reduced at the speed of 9 ℃/h until the temperature difference between the inside and the outside of the curing peng is less than or equal to 20 ℃.

Example 3:

the embodiment provides an autoclaved curing method for a prefabricated T beam in a high-cold low-pressure area, which comprises the following steps of placing the T beam in a curing shed:

standing: keeping the temperature in the maintenance shed at 15 ℃ and keeping the temperature for 4 hours;

and (3) heating: raising the temperature in the maintenance shed to 45 ℃ at the speed of 13 ℃/h, and preserving the heat until the strength of the concrete reaches 80% of the designed strength of the concrete;

cooling: the temperature is reduced for 4 hours at the speed of 5 ℃/h, and then the temperature is reduced at the speed of 10 ℃/h until the temperature difference between the inside and the outside of the curing peng is less than or equal to 20 ℃.

Example 4:

this example further defines, on the basis of examples 1 to 3: as shown in fig. 1, comprises a boiler 1 and a thermal insulation shed 2 communicated with a steam outlet pipe 11 of the boiler 1, wherein,

the boiler 1 comprises a hearth and a flue gas header communicated with the hearth;

a fuel inlet 10 and a furnace ash outlet 12 are arranged on the hearth, a transverse water pipe 13 is arranged in the hearth, and the inlet end of the transverse water pipe 13 is connected with a water tank;

a flue gas outlet 14 is formed in the flue gas collecting box, a steam collecting box 15 is arranged in the flue gas collecting box, the steam collecting box 15 is communicated with an outlet of a transverse water pipe 13, a steam outlet pipe 11 is arranged on the steam collecting box 15, and an outlet of the steam outlet pipe 11 penetrates out of the flue gas collecting box and is connected with the flue gas collecting box;

the heat preservation shed 2 comprises a support frame, heat preservation and moisture preservation cloth 21 covering the support frame and serving as a shed roof and a shed side wall, and at least one door located on the shed side wall, wherein an outlet of the steam outlet pipe 11 is located in the heat preservation shed 2.

The autoclaved curing method for the prefabricated T beam in the high-cold low-pressure area can be a vertical shell-and-pan boiler 1. The coal, gas, oil and firewood boiler 1 has slow burning speed, cannot adjust temperature difference as soon as possible, has limited resources and cannot be regenerated, has great environmental pollution after burning, has more personnel investment in the operation process, high operation cost and long maintenance period and low work efficiency, and therefore, biomass fuel is preferably used. The fuel is thrown into at furnace inlayer form burning by the furnace gate, has arranged horizontal water pipe 13 in the furnace, and high temperature flue gas transversely erodees horizontal water pipe 13 and fully convective heat transfer, then gets into the flue gas collection box, sets up vapour collection box 15 in the flue gas collection box, and the flue gas erodees vapour collection box 15, has reduced the flue gas temperature, improves steam temperature, and the flue gas is discharged into the atmosphere at last. The boiler 1 has strong load adaptability, can safely and normally operate within the range of 60-100% of rated load, and has the steam temperature of over 170 ℃.

The concrete prefabricated part or the T-shaped beam is arranged in the heat preservation shed 2, the concrete prefabricated part or the T-shaped beam can conveniently enter and exit from the door due to the existence of the supporting frame, the heat preservation and moisture preservation cloth 21 can slow down the loss speed of the surface temperature or the humidity of the concrete or the T-shaped beam, the difference between the internal temperature and the external temperature and the humidity is reduced, and the problem of temperature difference cracks on the surface of the concrete is solved to a certain degree. Although the curing cloth can reduce the loss of the temperature and the humidity of the surface of the concrete, the curing cloth is still difficult to be consistent with the temperature and the humidity of the inside, so a steam pipe is arranged to convey the steam into the shed, the temperature and the humidity of the surface of the concrete are increased, and the temperature and the humidity of the surface and the inside of the concrete are uniformly distributed as much as possible.

Example 5:

this embodiment further defines, on the basis of embodiment 1: inside being provided with first temperature monitoring device of material in the thermal-insulation shed 2, be provided with second temperature monitoring device in the thermal-insulation shed 2, be provided with third temperature monitoring device and flow control device on going out the steam pipe 11, first temperature monitoring device, second temperature monitoring device, third temperature monitoring device and flow control device all link to each other with the singlechip.

The first temperature monitoring device, the second temperature monitoring device and the third temperature monitoring device can be three thermometers which are all connected with the single chip microcomputer, the single chip microcomputer calculates the temperature difference inside and outside the concrete through measuring the temperature in the heat preservation shed 2 and the temperature inside the concrete, and then adjusts the flow of the steam according to the temperature of the steam, so that the temperature in the heat preservation shed 2 is relatively stable, and the temperature inside and outside the concrete is consistent.

The support frame in this application can be arbitrary structure, as long as can support heat preservation and moisture preservation cloth 21 and can cover the concrete prefabricated part and establish heat preservation and moisture preservation cloth 21 below, can slow down the scattering and disappearing of temperature, humidity can. Wherein, the support frame lower extreme also can set up the wheel, makes things convenient for the removal of thermal-insulation shed 2, during the use, can push away thermal-insulation shed 2 to the department of T type roof beam and carry out the maintenance to it.

Example 6:

this embodiment further defines, on the basis of embodiment 1: a flow splitting block 16 is arranged below the transverse water pipe 13, and the flow splitting block 16 is fixed in the hearth through a connecting rod;

a flue gas channel is formed between the flow dividing block 16 and the inner wall of the hearth.

The diverter block 16 functions as a dust-blocking diverter, a large amount of soot is generated when fuel is combusted, and the diverter block 16 blocks a portion of the soot which exits from the flue gas channel with the soot.

Example 7:

this embodiment further defines, on the basis of embodiment 6: the lower surface of the flow dividing block 16 gradually inclines upwards from the middle to the periphery, so that the rising resistance of the smoke is reduced.

Example 8:

this embodiment further defines, on the basis of embodiment 6: the upper surface of the diverter block 16 is gradually inclined downward from the middle to the periphery to prevent the soot from accumulating on the upper surface of the diverter block 16 to some extent.

Example 9:

this embodiment further defines, on the basis of embodiment 6: a dust baffle plate 17 capable of turning downwards is arranged above the smoke channel, one side of the dust baffle plate 17 is arranged on the furnace wall through a rotating shaft, and the side far away from the furnace wall is supported by a spring 18 fixed on a flow dividing block 16 or a connecting rod below.

The dust board 17 is arranged at a height lower than that of the horizontal water pipe 13 and above the flue gas channel, so that the dust board can further play a role in blocking dust. In addition, one side of the dust blocking plate 17 far away from the furnace wall can be slightly inclined upwards, when too much soot falls on the dust blocking plate 17, the pressure born by the spring 18 is increased, the side of the dust blocking plate 17 far away from the furnace wall is supposed to incline, the furnace soot slides off, and the dust blocking plate 17 resets and continuously circulates.

Example 10:

this embodiment further defines, on the basis of embodiment 9: more than two dust baffles 17 are arranged on the furnace wall along the circumferential direction.

More than two dust boards 17 are enclosed into a ring, and the flue gas is upward from the middle part of the ring enclosed by the dust boards 17, so that the transverse water pipe 13 can be washed intensively, and the heat exchange efficiency is improved.

Example 11:

this embodiment further defines, on the basis of embodiment 9: a vibration cavity is arranged in the dust guard 17, and a hitting ball 171 is arranged in the vibration cavity.

When the dust board 17 is in the normal position, the hitting ball 171 is close to the oven wall, along with the increase of soot on the dust board 17, the inner side of the dust board 17 is gradually downward, when the inner side height is lower than the height of the outer side close to the oven wall, the hitting ball 171 can slide to one side far away from the oven wall, through a device between the hitting ball 171 and the inner side of the vibration cavity, the soot on the dust board 17 slides, then the dust board 17 resets, the impact vibration cavity is close to one side of the oven wall, because of rigid connection between the dust board 17 and the oven wall, the oven wall can also vibrate therewith, the soot attached to the oven wall is vibrated, and two purposes are achieved by one action.

Example 12:

this embodiment further defines, on the basis of embodiment 4: the door comprises a door frame 22 and a door curtain 21, wherein a roller driven by a pull rope 26 is arranged on the door frame 22, and the upper edge of the door curtain 21 is fixed on the roller along the axial direction of the roller;

the door frame 22 is provided with a sleeve 25, the roller is mounted in the sleeve 25 through a bearing, and a notch for the door curtain 21 to enter and exit is arranged below the sleeve 25.

The upper edge of the door curtain 21 is fixed on the roller, and the door curtain 21 can be wound on the rotating shaft or released from the rotating shaft in the process that the pull rope 26 drives the roller to rotate, so that the door can be opened and closed. The roller sets up in sleeve 25, prevents on the one hand that the roller from receiving to collide with, and on the other hand construction site dust probably is great, if do not have sleeve 25, the dust is long-term to be accumulated between roller and stay cord 26, probably appears the card pause phenomenon between stay cord 26 and the roller.

Example 13:

this embodiment further defines, on the basis of embodiment 12: a drop rod 27 is arranged at the bottom end of the door curtain 21 along the edge of the door curtain 21;

sliding grooves 221 are formed in two vertically arranged sides of the door frame 22, a sliding block 231 capable of sliding in the sliding grooves 221 is arranged on the door curtain 21 or the drop rod, and the width of a groove opening of each sliding groove 221 is smaller than the diameter of the corresponding sliding block 231.

Or the construction site has wind, the lower end of the door curtain 21 has no heavy objects and can float, so that the humidity and the temperature in the shed are dissipated. The sliding block 231 can slide in the sliding groove 221, so that the gap between the door curtain 21 and the door frame 22 is reduced, and the dissipation speed of the temperature and the humidity in the shed is reduced.

Example 14:

this embodiment further defines, on the basis of embodiment 13: the entrance of the top end of the sliding groove 221 is provided with a guide part 222, and the width of the guide part 222 is gradually reduced from top to bottom.

The top end of the sliding slot 221 is provided with a guiding portion 222, when the sliding block 231 enters the sliding slot 221, the guiding portion 222 can play a role of guiding the sliding block 231 to align with the sliding slot 221, and the sliding block 231 is prevented from being clamped at the inlet of the sliding slot 221 due to the fact that the sliding block 231 and the sliding slot 221 are not aligned.

Suggesting a construction process flow

Technical preparation, equipment and pipeline system manufacturing and installation, thermal insulation shed erection, autoclave curing system debugging and acceptance, temperature measurement system component part pre-embedding and installation, concrete pouring, steam curing and temperature and humidity monitoring.

1. The principle of the device is as follows:

and (4) carefully familiarizing with the drawing, and configuring a maintenance plane layout according to the setting condition of the prefabricating yard. And organizing related technicians to compile a construction scheme and carrying out technical background crossing on the constructors. Related equipment and materials are organized in advance according to the needs of a construction site, and the purchased boiler, the biomass burner and the materials of the mechanism parts meet the design requirements and are accepted by acceptance at the site.

The boiler should be installed in a room with good ventilation and sufficient light, far away from the gathering place of the population, and should have sufficient lighting, cooling and anti-freezing measures. The steam outlet of the boiler is connected out by adopting a steel pipe with the same diameter, and then branch pipes are connected, and generally 8 branch pipes are connected for later use. The canvas rubber tube is connected with a tee rigid tube, and the distance between the tee tubes is 5 meters.

2. Heat preservation shed erection

And (4) covering the T-shaped beam with health-preserving tarpaulin in time after the T-shaped beam is poured (full coverage). And the connected canvas rubber pipes are arranged from two sides of the template, and the connecting rubber pipes are connected with the steam outlet branch pipes.

3. Debugging and acceptance of autoclaved curing system

And starting to debug each item of the autoclaved curing system after each item of equipment is installed, reporting and supervising the autoclaved curing system to check and accept the autoclaved curing system after the technical personnel of the project department debug the autoclaved curing system, and using the autoclaved curing system after the autoclaved curing system is qualified by supervision and acceptance.

4. Temperature measurement system component part pre-embedding and mounting

The embedded lines of the internal temperature measuring instruments are embedded into specific positions according to different positions of the T-beam to be measured before the T-beam is poured, and the lengths of the embedded lines are reserved according to actual requirements.

5. Pouring of concrete

And when the embedded line of the thermodetector is installed, the T-beam concrete begins to be poured.

6. Steam curing and temperature and humidity monitoring

After the preparation work is finished, the fire outlet of the biomass burner is aligned to the combustion chamber of the boiler, the burner is filled with biomass fuel, a power supply is started, the temperature is adjusted, the valve is opened when the water temperature in the boiler reaches 90 ℃, steam is supplied to maintain, and meanwhile, the temperature and humidity condition is monitored. When the temperature in the tent is measured, if the temperature is too high, the burning rate of the burner is adjusted to be reduced in time, so that the effect of reducing the temperature is achieved. If the temperature is too low, the combustion rate of the combustor is timely increased, so that the temperature rise effect is achieved.

6.1 concrete nutrient steaming is carried out in 4 stages of standing still, temperature rising, constant temperature and temperature lowering.

6.2 in the steam curing process, a specially-assigned person is dispatched to monitor the change condition of the temperature in the heat-preservation shed at any time, the temperature is measured every 1-2 hours, and a record is made so as to provide a basis for deducing the strength of the concrete.

(1) T roof beam maintenance system

And after the beam pouring is finished, immediately erecting a warm shed to carry out temperature increasing and health preserving, wherein the health preserving adopts steam health preserving. Steam pipelines are laid on two sides of a beam-making pedestal in a beam field, 1 air hole is arranged every 1m on the pipeline, a steam valve is arranged in front of the pipeline, and the steam discharge amount is adjusted at any time to control the health-preserving temperature. Meanwhile, during steam curing, attention must be paid to: because the surface coefficient of the beam body is larger, the temperature rise and fall speed of the concrete during steam curing is respectively not more than 10 ℃/h and 15 ℃/h. Strictly prohibiting the sudden rise and fall of the temperature; the water cement ratio is properly adjusted to be small, and the edges, the end parts, the corners and other parts of the beam body which are easy to cool particularly strengthen the heat preservation. Forbidding to spray water into the concrete; the steam curing temperature is not more than 80 ℃, and the curing time is controlled to ensure that the designed strength of the concrete is 80 percent.

(2) Intelligent temperature control

The health preserving of roof beam is responsible for by the special messenger, pays attention to the temperature condition of monitoring inside temperature and playing no temperature at any time, controls the temperature, and 7 days temperature must not be less than 25 ℃ to in order to prevent to produce the difference in temperature crack, the difference in temperature should not exceed 25 ℃ on roof beam surface and inside. The field responsible personnel should observe, record and archive temperature data every two hours. Carrying out vacuum grouting on prestressed pipeline grouting in a greenhouse in the daytime, and measuring the temperature once every hour in the grouting process and 48 hours after grouting; the water temperature of the grouting is measured by controlling the mixing water of each plate of the grouting, and the temperature of the slurry is measured and checked every half hour. During the period, the greenhouse is not removed, and the two ends of the beam body are required to be covered tightly. The end-sealed concrete is constructed in a greenhouse, and is covered by plastic cloth for health preservation.

(3) Tool type heat preservation shed

The pedestal heat-preservation shed is used for steam curing, and the heat-preservation shed is used for providing a closed space for steam curing of the precast beam and keeping the temperature around the beam body relatively stable.

The length of the heat preservation shed is 32m, in order to be convenient to hang, 5 sections (7 x 2+6 x 3) m are adopted for assembly and combination, the maximum width and the maximum height of the installed T-beam template are 2.3 x 2.5 according to actual measurement on site, therefore, the net width of the steam-curing shed processed by the department is 2.6m, the net height of the steam-curing shed is 2.6m, the steam-curing shed is formed by erecting [8cm curled-edge channel steel, 25 x 1.5mm square steel pipes, 30 x 15mm rectangular steel pipes and colorful steel plate polystyrene heat preservation sandwich boards, one end of the steam-curing shed is closed, and the other end of the steam-curing shed is provided with a door.

The material fuel low-pressure high-temperature boiler is applied to concrete curing cases in high altitude and high cold areas, and solves the problem of cracking of the surface and deep layers of concrete caused by large temperature difference change and large temperature difference inside the concrete.

The material fuel low-pressure high-temperature boiler is applied to concrete curing cases in high altitude and high cold areas. The combustor can adjust the temperature difference, and the biomass granular fuel takes agriculture and forestry residues as raw materials and is finally prepared into a formed environment-friendly fuel, so that the biomass granular fuel is high in heat value and sufficient in combustion, and is a clean low-carbon renewable energy source. Meanwhile, the environment is not polluted, and the combustion consumables are low. Greatly reducing the operation cost and shortening the construction period.

7. Quality control

7.1 quality Standard

The requirements and errors involved in the construction process are strictly executed according to design requirements and the current relevant regulations in the countries such as 'Highway bridge construction technical Specification' (JTG/T F50-2011), 'Highway maintenance technical Specification' (JTG H10-2009), 'Highway engineering cement and cement concrete test regulations' (JTG E30-2005), and the like.

7.2 construction heavy and difficult point control

And (3) familiar with drawings, arranging the allocation positions of the maintenance system, assembling the equipment strictly according to the equipment specification, and performing the connection of related pipelines strictly according to a scheme.

Technical preparation, construction scheme and bottom-crossing technical work are made, the tightness among all connecting end pipes is checked, whether the air leakage phenomenon exists or not, whether the boiler air pressure is normal or not, whether the steam outlet of each steam pipe opening is uniform or not, whether the adjustment size of a biomass burner is controllable or not and the like are checked.

And adjusting the external heat supply temperature in time according to the measured internal temperature of the newly poured concrete, ensuring internal and external balance, and measuring whether the humidity meets the requirement of maintenance humidity.

8. Safety measures

The temporary electricity utilization of the construction site is strictly executed according to the relevant specification of the construction site temporary electricity utilization safety technical specification.

The safety management of small machines, boilers and burners on construction sites is enhanced, the daily maintenance is adhered to, the safety inspection is carried out regularly, and the power supply is cut off immediately when the machine is not used.

A perfect construction safety guarantee system is established, the safety check of construction operation is enhanced, and the operation standardization and normalization are ensured.

9. Environmental protection measure

The construction site comprises the steps of piling up materials such as pipes, accessories, appliances, valves, equipment and the like used on the working face according to different specifications and models, and hanging the signboard.

The biomass waste residues after combustion are cleaned in time, and are packed into bags conveniently and poured into designated positions, so that the cleanness of a construction site is ensured.

The above construction process flow is only one flow of the construction process in the present application, and is not intended to limit the scope of protection of the present application.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims (7)

1. The autoclaved curing method for the prefabricated T beam in the high-cold low-pressure area is characterized by comprising the following steps of putting the T beam into a curing shed:

standing: keeping the temperature in the curing shed at 10-20 ℃ and keeping the temperature for 2-6 h;

and (3) heating: raising the temperature in the maintenance shed to 40-50 ℃, and preserving the heat until the strength of the concrete reaches the specified cooling demolding strength;

cooling: reducing the temperature in the maintenance shed to the temperature difference between the inside and the outside of the shed being less than or equal to 20 ℃;

the used steam-pressure curing device comprises a boiler (1) and a heat-preservation shed (2) connected with the boiler (1), wherein,

the boiler (1) comprises a hearth and a flue gas header communicated with the hearth;

a fuel inlet (10) and a furnace ash outlet (12) are arranged on the hearth, a transverse water pipe (13) is arranged in the hearth, and the inlet end of the transverse water pipe (13) is connected with a water tank;

a flue gas outlet (14) is formed in the flue gas collecting box, a steam collecting box (15) is arranged in the flue gas collecting box, the steam collecting box (15) is communicated with an outlet of the transverse water pipe (13), a steam outlet pipe (11) is arranged on the steam collecting box (15), and an outlet of the steam outlet pipe (11) penetrates out of the flue gas collecting box and is outside the flue gas collecting box;

the heat preservation shed (2) comprises a support frame, heat preservation and moisture preservation cloth (21) which covers the support frame and serves as a shed roof and a shed side wall, and at least one door which is positioned on the shed side wall, wherein the outlet of the steam outlet pipe (11) is positioned in the heat preservation shed (2);

a flow distribution block (16) is arranged below the transverse water pipe (13), and the flow distribution block (16) is fixed in the hearth through a connecting rod; a flue gas channel is formed between the flow dividing block (16) and the inner wall of the hearth;

a dust baffle plate (17) capable of turning downwards is arranged above the smoke channel, one side of the dust baffle plate (17) is arranged on the furnace wall through a rotating shaft, and the side far away from the furnace wall is supported by a spring (18) fixed on the flow dividing block (16) or the connecting rod below.

2. The autoclaved curing method for the prefabricated T beam in the alpine and low-pressure area as claimed in claim 1, wherein in the temperature raising step, the temperature raising speed is less than or equal to 15 ℃/h.

3. The autoclaved curing method for the prefabricated T beam in the high-cold low-pressure area as claimed in claim 1, wherein in the cooling step, the temperature is first reduced at a speed of 4-6 ℃/h for 3-5h, and then reduced at a speed of 9-11 ℃/h until the temperature difference between the inside and the outside of the curing wall is less than or equal to 20 ℃.

4. The autoclaved curing method for the prefabricated T-beam in the alpine and low-pressure area as claimed in claim 1, wherein the designated cooling and demolding strength is 75-85% of the designed strength of the concrete.

5. The autoclaved curing method for the prefabricated T-beam in the alpine and low-pressure area as claimed in claim 1, wherein a first temperature monitoring device is arranged inside the materials in the thermal insulation shed (2), a second temperature monitoring device is arranged in the thermal insulation shed (2), a third temperature monitoring device and a flow regulating device are arranged on the steam outlet pipe (11), and the first temperature monitoring device, the second temperature monitoring device, the third temperature monitoring device and the flow regulating device are all connected with a single chip microcomputer.

6. The autoclaved curing method for the prefabricated T-shaped beam in the alpine and low-pressure area as claimed in claim 1, wherein more than two dust baffles (17) are circumferentially installed on the furnace wall.

7. The autoclaved maintenance method for the prefabricated T-shaped beam in the alpine and low-pressure area as claimed in claim 1, wherein a vibration cavity is arranged in the dust board (17), and a striking ball (171) is arranged in the vibration cavity.

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