Steam curing type production line of concrete box girder

Abstract

The utility model relates to a steam curing type production line of a concrete box girder, which comprises a track, a trolley, a curing chamber arranged at one end of the track and a box girder mould arranged at the other end of the track, the trolley comprises a trolley bottom plate, and a front-side elastic sealing piece, a left-side elastic sealing piece, a right-side elastic sealing piece and a sealing curtain are arranged in the curing chamber. The upper end of the sealing curtain is connected with a top plate of the curing chamber in a sealed mode, the lower end of the sealing curtain is connected to the rear end of the left elastic sealing piece and the rear end of the right elastic sealing piece in a sealed and lapped mode, a steam spraying nozzle for spraying steam into the sealing chamber is arranged in the curing chamber and located above the front elastic sealing piece, and a trolley access door opening is formed in the rear end of the curing chamber. The rail extends in the front-back direction. The steam curing device has the advantages that steam can be saved, watering curing is replaced, the curing efficiency is high, and the quality is good.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a box beam forming method. Background Art

[0002] The inner and outer molds are required to form a box girder. The outer mold is opened by sliding, which causes great damage to the box girder. The shrinkage or expansion of the concrete during solidification (depending on the properties of the concrete, some shrink, some expand) will affect the surface strength of the cast box girder body, and the density of the two lower corners of the outer surface of the box girder is poor. The box girder needs to be maintained during production. The existing maintenance method is manual water spraying at the prefabrication site. This maintenance method takes a long time, is inefficient, and has poor maintenance effects. Utility Model Content

[0003] The first object of the utility model is to provide a steam-curing production line for concrete box girders that can save steam usage and is cured by steam to replace watering curing, with high curing efficiency and good quality.

[0004] The second purpose of the utility model is to further provide a steam-cured production line for concrete box girders that can make the two lower corners of the formed box girders have high density, thereby solving the problem of poor density of the two lower corners of the existing box girders.

[0005] The third object of the utility model is to further provide a steam-cured production line for concrete box girders capable of performing downward inclined mold opening, thereby solving the problem that the surface of the box girder is easily damaged by horizontal mold opening.

[0006] The fourth object of the utility model is to further provide a steam-cured production line for concrete box girders whose cavity can change with the expansion and contraction of concrete, thereby solving the problem that the box girder cavity formed by the inner and outer molds of the existing box girder is fixed, resulting in expansion or contraction during concrete curing, which affects the surface strength of the box girder body.

[0007] The above technical problems are solved by the following technical solutions: a steam curing production line for concrete box girders, comprising a track, a trolley slidably connected to the track, a curing room arranged at one end of the track and a box girder mold arranged at the other end of the track, the trolley comprising a trolley bottom plate, trolley running wheels arranged on the trolley bottom plate to support the trolley bottom plate on the track and a trolley driving motor arranged under the trolley bottom plate to drive the trolley running wheels, the trolley driving motor is connected to a power supply through an electric wire, and a front elastic sealing sheet, a left elastic sealing sheet and a left elastic sealing sheet are arranged in the curing room. The sealing sheet is a sealing sheet, a right elastic sealing sheet and a sealing curtain. The upper end of the sealing curtain is sealed and connected with the top plate of the curing room, and the lower end is sealed and overlapped on the rear ends of the left elastic sealing sheet and the right elastic sealing sheet. When the bottom plate of the trolley is sealed and abutted with the front elastic sealing sheet, the left elastic sealing sheet and the right elastic sealing sheet, the sealing curtain is overlapped on the rear end of the bottom plate of the trolley. The curing room is provided with a steam nozzle for spraying steam toward the sealing room. The nozzle is located above the front elastic sealing sheet. The rear end of the curing room is provided with a trolley entrance and exit doorway, and the track extends in the front-to-back direction. The process of producing a concrete box beam is as follows: a box beam placed on the bottom plate of the trolley is cast through a box beam mold at the location of the mold, and the box beam is transported to the curing room by the trolley to output steam through the steam nozzle for curing the box beam. During curing, the front elastic sealing sheet, the left elastic sealing sheet and the right elastic sealing sheet are sealed and abutted against the bottom plate of the trolley to prevent steam from falling to the ground. Steam curing is achieved with high curing efficiency. It can effectively prevent the steam from falling under the trolley and touching the ground, thus saving steam.

[0008] Preferably, a heat preservation layer is provided on the inner surface of the curing chamber, a steam delivery pipe is provided in the heat preservation layer, and the steam nozzle is arranged on the steam delivery pipe, which can further improve the energy saving effect.

[0009] Preferably, the steam nozzle is an electric valve structure, and a push switch for controlling the steam nozzle is provided in the curing room. The push switch is a normally open switch, and includes a switch body and a push head. When the trolley enters the curing room along the track and reaches a set position, the bottom plate of the trolley presses the push head, and the steam nozzle is opened when the push head is pressed. It is convenient to check whether the trolley is in place in the curing room, and when it is in place, steam can be automatically turned on for steam curing.

[0010] Preferably, the pressing head is connected to a driving rod perpendicular to the track, and the trolley presses the pressing head through the driving rod, so as to improve the reliability when the pressing switch is touched.

[0011] Preferably, the box girder mold comprises an outer mold and an inner mold located inside the outer mold, a box girder cavity is formed between the outer mold and the inner mold, the outer mold comprises an outer mold bottom plate, two outer mold side plates and two outer mold end plates, the two outer mold side plates are detachably connected to the left and right sides of the outer mold bottom plate to form an outer mold groove, the two outer mold ends are closed at the two ends of the outer mold groove, the inner mold is a tubular structure, the two ends of the inner mold are passed through the two outer mold end plates, the outer mold bottom plate is supported on the trolley bottom plate, the two box girder side plates are connected to two opening and closing mold mechanisms one by one, the opening and closing mold mechanism comprises a fixed frame and a telescopic rod with one end hinged on the fixed frame, the other end of the telescopic rod is connected to the outer mold side plate, the outer mold side plate is supported on the outer mold bottom plate, the outer mold bottom plate is provided with an expansion groove extending along the extension direction of the box girder, the expansion groove is provided with a A feeding gap at the connection between the plate and the outer bottom plate, the feeding gap is connected with the box beam cavity, the lower end of the expansion groove is provided with a closing structure for closing the expansion groove, and the outer mold bottom plate is provided with a cutting strip for closing the feeding gap and a cutting strip driving cylinder for driving the cutting strip to open and close; in the specific process of box beam forming, concrete is poured into the box beam cavity, and during the pouring of concrete, the opening and closing mold mechanism drives the outer mold side plate to reciprocate in the left and right directions so that the concrete is squeezed into the expansion groove through the feeding gap to improve the density at the lower corner of the box beam, after the concrete pouring is completed, the cutting strip driving cylinder drives the cutting strip to close so that the feeding gap is closed to achieve the disconnection of the concrete in the expansion groove from the concrete in the box beam cavity, and after the concrete is solidified, the outer mold side plate is separated by the opening and closing mold mechanism, and then the outer mold end plate and the inner mold are removed, and the closing mechanism is opened to take out the concrete head formed by the concrete solidification in the expansion groove. During the box girder forming process, the two lower corners of the outer surface are prone to insufficient density and missing, and the technical solution can make the lower corners of the formed box girder have good density. The second purpose of the utility model is achieved.

[0012] Preferably, the mold opening and closing mechanism is provided with a plurality of inclined slide rails fixed on the ground perpendicular to the track and distributed in the extension direction of the track, the inclined slide rails are higher at one end facing the outer mold and lower at the other end, and the lower end of the outer mold side plate is slidably connected to the inclined slide rails; the process of dismantling the box beam mold is as follows: when the concrete poured in the adjacent cavity solidifies to form a prefabricated box beam, the telescopic rod contracts to make the outer mold side plate move downward along the extension direction of the inclined track to achieve the disengagement of the outer mold side plate, and then remove the inner mold, and finally remove the outer mold end plate. The outer side plate is tilted downward and opened sideways, and the outer side surface of the box beam is a vertical surface. This demoulding method has a shearing effect in the process of disengaging the outer mold side plate, which makes the demoulding of the outer mold side plate labor-saving and reliable, and has little impact on the side surface of the box beam. The third purpose of the utility model is achieved.

[0013] Preferably, the inclined slide rail is provided with an elongated sliding hole extending in the extending direction of the inclined slide rail, the elongated sliding hole is a through hole, the outer mold side plate is provided with a supporting foot supported on the inclined slide rail, the supporting foot is provided with a sliding rod passing through the elongated sliding hole, and the sliding rod is threadedly connected with a locking nut located below the inclined slide rail to prevent the sliding rod from falling out of the elongated sliding hole, so that the outer mold side plate can be reliably inclined.

[0014] Preferably, both left and right ends of the support leg are provided with upper flanges, and the angle between the upper flange and the inclined slide rail is an acute angle, so that the upper end is not easily stuck during sliding.

[0015] Preferably, it also includes a boost plate located above between the two outer mold side plates and a boost plate lifting cylinder for driving the boost plate to rise and fall, the outer mold side plates include an outer plate and an inner plate, the inner plate is connected to the outer plate via a transverse support spring, the outer plate is connected to the telescopic rod, the inner plate constitutes the groove wall of the outer mold groove, the inner plate is fixedly connected to an inner plate guide rod penetrating the outer plate, and the lower end of the inner plate is sealed and movably placed on the outer mold bottom plate when in the mold closing state, the opening and closing mold mechanism also includes an inner plate driving cylinder, the cylinder body of the inner plate driving cylinder is fixed to the outer plate, and the piston rod is connected to the inner plate through a clutch. After the concrete is poured into the box beam cavity, the booster plate is driven down by the booster plate lifting cylinder to make the spring energy stored to the set value, and the booster plate is maintained in the current state. At this time, there is an avoidance gap between the booster plate and the inner plate. During the concrete solidification process, the inner plate can move synchronously regardless of whether the concrete volume increases or decreases; during the pouring of concrete, the inner plate is driven by the inner plate cylinder to make a reciprocating translation in the left and right directions. This can ensure the flatness and density of the box beam surface.

[0016] Preferably, the outer mold bottom plate includes a left half and a right half of the bottom plate, the left half and the right half of the bottom plate are hinged together by a hinge extending along the front-rear direction of the axis, the hinge is supported on the trolley bottom plate by a middle vertical telescopic cylinder, the left half of the bottom plate is supported on the trolley bottom plate by a left vertical telescopic cylinder, and the right half of the bottom plate is supported on the trolley bottom plate by a right vertical telescopic cylinder; during the process of assembling the outer mold, the outer mold bottom plate is maintained in the required pop-up state and sealed against the outer mold inner plate by adjusting the left telescopic cylinder, the middle vertical telescopic cylinder and the right vertical telescopic cylinder; during the process of removing the outer mold, the left vertical telescopic cylinder and the right vertical telescopic cylinder contract to realize the demoulding of the outer mold bottom plate, and at the same time, the outer mold bottom plate is disengaged from the outer mold inner plate, providing an avoidance space for the demoulding process in which the outer mold side plates are tilted downward and separated. It can not only ensure the reliability and convenience of mold closing, but also save effort in demoulding.

[0017] Preferably, the left and right side walls of the expansion groove are arc surfaces with the hinge as the center line, the expansion groove is penetrated with ribs distributed in the front-back direction, the closed structure includes a pull plate located below the outer mold bottom plate and a movable support plate slidably connected in the expansion groove, one end of the rib is penetrated on the movable support plate, and the other end is detachably connected to the pull plate, the movable support plate is supported on the pull plate by a vertical support spring, the pull plate is connected to the swing motor through a swing rod, and the swing axis of the swing rod is coaxial with the hinge; in the process of pouring concrete into the box beam cavity, the concrete enters the expansion groove and squeezes the movable support plate outward to fill the expansion groove, and in the process of disengaging the outer mold bottom plate, the swing rod is first driven by the swing motor to swing downward so that the pull plate pulls the ribs to pull the telescopic concrete head out, and then the outer mold bottom plate is removed; when the box beam is installed next time, the concrete head and ribs are removed from the movable support plate, and new ribs are installed for use. It can make it convenient, reliable and labor-saving to remove the concrete head.

[0018] Preferably, the ribs are fixed to the pull plate by connecting pins, a hook is provided at one end of the ribs located in the expansion groove, and a plastic film is padded on the surface of the movable support plate away from the pull plate, which is convenient for assembly and disassembly and reliable for pulling out the concrete head.

[0019] Preferably, both left and right ends of the outer mold bottom plate are removably connected with blocking pins for preventing the inner side plate from falling off.

[0020] Preferably, the inner mold comprises an inner mold upper plate, an inner mold left plate, an inner mold lower plate and an inner mold right plate connected end to end in sequence, the upper surface of the inner mold lower plate is a "V" shape, the lower surface of the inner mold upper plate is an inverted "V" shape, the left end of the inner mold upper plate rests on the upper end of the inner mold left plate, and the right end rests on the upper end of the inner mold right plate, the lower end of the inner mold left plate is supported on the left end of the inner mold lower plate, and the lower end of the inner mold right plate is supported on the right end of the inner mold lower plate, and the inner mold left plate and the inner mold right plate are connected together by a number of connecting cylinders that can be telescopic to the left and right; the process of removing the inner mold is: the inner mold left plate and the inner mold right plate are disengaged from the box beam by contracting the connecting cylinder, at which time the inner mold upper plate and the inner mold lower plate move in the up and down directions and have a moving space, and the inner mold upper and lower plates are disengaged at the upper end of the inner mold lower plate and the lower inner mold upper plate. It is convenient and reliable to disengage the inner mold, so that it is labor-saving to remove the inner mold from the box beam.

[0021] Preferably, the left side of the front and rear ends of the upper inner mold plate is provided with an upper left hooking strip and the right side is provided with an upper right hooking strip, the upper left hooking strip is parallel to the left half of the upper inner mold plate, the upper right groove strip is parallel to the right half of the upper inner mold plate, the front and rear ends of the left inner mold plate are provided with an upper left hook head hooked on the upper left hooking strip, and the front and rear ends of the right inner mold plate are provided with an upper right hook head hooked on the upper right hooking strip; the left side of the front and rear ends of the lower inner mold plate are provided with a lower left hooking strip and the right side is provided with a lower right hooking strip, the lower left hooking strip is parallel to the left half of the lower inner mold plate, the lower right groove strip is parallel to the right half of the lower inner mold plate, the front and rear ends of the left inner mold plate are provided with a lower left hook head hooked on the lower left hooking strip, and the front and rear ends of the right inner mold plate are provided with a lower right hook head hooked on the lower right hooking strip. The upper inner mold plate and the lower inner mold plate can be disengaged synchronously during the disengagement of the left and right inner mold plates.

[0022] The beneficial effects of the utility model are: the outer mold side plate is opened at an angle downward, which has little impact on the side of the box beam body; the change in solidification volume has little impact on the quality of the box beam; the two lower corners of the produced box beam have high density; steam curing is achieved with high curing efficiency; and steam loss can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the box girder production line;

[0024] Figure 2 It is a schematic diagram when the trolley is located at the mold and the mold is in a mold-closing state;

[0025] Figure 3 for Figure 2 A local enlarged schematic diagram of point A;

[0026] Figure 4 for Figure 2 A local enlarged schematic diagram of point B;

[0027] Figure 5 for Figure 4 A local enlarged schematic diagram of point C;

[0028] Figure 6 for Figure 2 A local enlarged schematic diagram of point D.

[0029] In the figure: outer mold bottom plate 1, outer mold side plate 2, outer mold end plate 3, trolley bottom plate 4, mold opening and closing mechanism 5, fixed frame 6, telescopic rod 7, expansion groove 8, feed gap 9, closed structure 10, cutter strip 11, cutter drive cylinder 12, vertical knife rod 13, horizontal guide rod 14, inclined slide rail 15, long strip slide hole 16, support foot 17, slide rod 18, anti-slip nut 19, upper flange 20, booster plate 21, booster plate lifting cylinder 22, outer plate 23, inner plate 24, horizontal support spring 25, inner plate guide rod 26, inner plate drive cylinder 27, clutch 28, left half of bottom plate 29, right half of bottom plate 30, hinge 31, middle vertical telescopic cylinder 32, left vertical telescopic cylinder 33, right vertical telescopic cylinder 34, tendon 35, pull plate 36, movable support plate 37 , vertical support spring 38, rocker arm 39, blocking pin 40, inner mold upper plate 41, inner mold left plate 42, inner mold lower plate 43, inner mold right plate 44, connecting cylinder 45, upper left hook strip 46, upper right hook strip 47, upper left hook head 48, upper right hook head 49, lower left hook strip 50, lower right hook strip 51, lower left hook head 52, lower right hook head 53, box beam 54, connecting pin 56, hook head 57, plastic film 58, track 60, trolley 61, curing room 62, box beam mold 63, trolley walking wheel 64, front elastic sealing piece 65, left elastic sealing piece 66, right elastic sealing piece 67, sealing curtain 68, steam nozzle 69, insulation layer 70, steam delivery pipe 71, push switch 72, switch body 73, push head 74, drive rod 75. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0031] See also Figures 1 to 6A steam curing production line for concrete box girders comprises a track 60, a trolley 61 slidably connected to the track, a curing room 62 arranged at one end of the track and a box girder mold 63 arranged at the other end of the track. The trolley comprises a trolley bottom plate 4, a trolley running wheel 64 arranged on the trolley bottom plate to support the trolley bottom plate on the track and a trolley driving motor arranged below the trolley bottom plate to drive the trolley running wheel. A front elastic sealing sheet 65, a left elastic sealing sheet 66, a right elastic sealing sheet 67 and a sealing curtain 68 are arranged in the curing room. The upper end of the sealing curtain is sealed and connected to the top plate of the curing room, and the lower end is sealed and overlapped on the rear ends of the left elastic sealing sheet and the right elastic sealing sheet. When the trolley bottom plate is sealed and abutted with the front elastic sealing sheet, the left elastic sealing sheet and the right elastic sealing sheet, the sealing curtain overlaps on the rear end of the trolley bottom plate. A steam nozzle 69 for spraying steam toward the sealed chamber is provided in the curing room. The nozzle is located above the elastic sealing sheet on the front side. A trolley entrance and exit door is provided at the rear end of the curing room, and the track extends in the front-to-back direction. An insulation layer 70 is provided on the inner surface of the curing room, and a steam delivery pipe 71 is provided in the insulation layer, on which the steam nozzle is arranged. The steam nozzle is an electric valve structure, and a push switch 72 for controlling the steam nozzle is provided in the curing room. The push switch is a normally open switch, and includes a switch body 73 and a push head 74. When the trolley enters the curing room along the track and reaches the set position, the bottom plate of the trolley presses the push head, and the steam nozzle opens when the push head is pressed. A driving rod 75 perpendicular to the track is connected to the push head, and the trolley squeezes the push head through the driving rod.

[0032] The process of producing concrete box girders is as follows: a box girder 54 placed on the bottom plate of a trolley is cast through a box girder mold at the location of the mold, the box girder is transported to a curing room through a trolley and steam is output through a steam nozzle to cure the box girder. During curing, the front elastic sealing sheet, the left elastic sealing sheet and the right elastic sealing sheet are sealed against the bottom plate of the trolley to prevent steam from falling to the ground.

[0033] The box girder mold includes an outer mold and an inner mold located inside the outer mold, and a box girder cavity is formed between the outer mold and the inner mold. The outer mold includes an outer mold base plate 1, two outer mold side plates 2 in the left and right directions, and two outer mold end plates 3 distributed in the front and rear directions. The two outer mold side plates are detachably connected to the left and right sides of the outer mold base plate to form an outer mold groove. The two outer mold ends are closed at the two ends of the outer mold groove, the inner mold is a tubular structure, and the two ends of the inner mold are passed through the two outer mold end plates. The outer mold base plate is supported on the trolley bottom plate 4, and the two box girder side plates are connected to two opening and closing mold mechanisms 5 in a one-to-one correspondence. The opening and closing mold mechanism includes a fixed frame 6, a telescopic rod 7 with one end hinged on the fixed frame, and a plurality of inclined slide rails 15 fixed on the ground perpendicular to the track and distributed in the extension direction of the track. The other end of the telescopic rod is hingedly connected to the outer mold side plate. The outer mold side plate is supported on the outer mold bottom plate, and the outer mold bottom plate is provided with an expansion groove 8 extending along the extension direction of the box beam. The expansion groove is provided with a feed gap 9 extending along the extension direction of the box beam and located at the connection between the outer mold side plate and the outer bottom plate. The feed gap is connected with the box beam cavity. The lower end of the expansion groove is provided with a closing structure 10 for closing the expansion groove. The outer mold bottom plate is provided with a cutting strip 11 for closing the feed gap and a cutting strip driving cylinder 12 for driving the cutting strip to open and close. The cutting strip extends in the left and right directions, and the cutting strip is connected to the upper end of the vertical cutting rod 13, and the lower end of the vertical cutting rod is connected to the cutting strip driving cylinder. The vertical guide rod is sleeved on the horizontal guide rod 14 to prevent the cutting strip from shaking when it is translated. The inclined slide rail is higher at one end toward the outer mold and lower at the other end, and the lower end of the outer mold side plate is slidably connected to the inclined slide rail. The inclined slide rail is provided with a long strip slide hole 16 extending in the extending direction of the inclined slide rail, and the long strip slide hole is a through hole. The outer mold side plate is provided with a support foot 17 supported on the inclined slide rail, and the support foot is provided with a slide rod 18 (specifically a bolt) passing through the long strip slide hole. The slide rod is threadedly connected with a stop nut 19 located below the inclined slide rail to prevent the slide rod from escaping from the long strip slide hole. The left and right ends of the support foot are provided with an upper flange 20, and the angle between the upper flange and the inclined slide rail is an acute angle. It also includes a booster plate 21 located above between the two outer mold side plates and a booster plate lifting cylinder 22 for driving the booster plate to rise and fall. The booster plate lifting cylinder is connected to the fixed frame of the two mold opening and closing mechanisms through a connecting frame. The outer mold side plate includes an outer plate 23 and an inner plate 24. The inner plate is connected to the outer plate through a transverse support spring 25. The outer plate is connected to the telescopic rod. The inner plate constitutes the groove wall of the outer mold groove. The inner plate is fixedly connected to an inner plate guide rod 26 that penetrates the outer plate. When in the mold closing state, the lower end of the inner plate is sealed and movably placed on the outer mold bottom plate. The mold opening and closing mechanism also includes an inner plate driving cylinder 27. The cylinder body of the inner plate driving cylinder is fixed to the outer plate, and the piston rod is connected to the inner plate through a clutch 28. In the process of pouring concrete into the box beam cavity, only the inner plate of the outer mold side plate is translated, specifically, the clutch is closed and the inner plate driving cylinder drives the translation. During the curing process, at the clutch port, the inner wall driving cylinder contracts to avoid interference with the movement of the inner plate as the concrete shrinks and expands.The outer mold base plate includes a left half 29 and a right half 30 of the base plate. The left half and the right half of the base plate are hinged together by a hinge 31 whose axis extends in the front-to-back direction. The hinge is supported on the trolley base plate through a middle vertical telescopic cylinder 32. The left half of the base plate is supported on the trolley base plate through a left vertical telescopic cylinder 33, and the right half of the base plate is supported on the trolley base plate through a right vertical telescopic cylinder 34. During the process of assembling the outer mold, the outer mold base plate is maintained in the required pop-up state and is sealed and abutted against the outer mold inner plate by adjusting the left telescopic cylinder, the middle vertical telescopic cylinder and the right vertical telescopic cylinder.

[0034] The left and right side walls of the expansion groove are arc surfaces with the hinge as the center line. The expansion groove is penetrated with ribs 35 distributed in the front-back direction. The closed structure includes a pull plate 36 located below the outer mold bottom plate and a movable support plate 37 slidably connected in the expansion groove. One end of the rib is penetrated on the movable support plate and the other end is detachably connected to the pull plate. The movable support plate is supported on the pull plate by a vertical support spring 38. The pull plate is connected to the swing motor through a swing rod 39, and the swing axis of the swing rod is coaxial with the hinge. The rib is fixed to the pull plate through a connecting pin 56. A hook 57 is provided at one end of the rib located in the expansion groove. A plastic film 58 is padded on the surface of the movable support plate away from the pull plate. The left and right ends of the outer mold bottom plate are removably connected with blocking pins 40 to prevent the inner plate from falling off. The inner mold includes an inner mold upper plate 41, an inner mold left plate 42, an inner mold lower plate 43 and an inner mold right plate 44 which are connected together end to end in sequence. The upper surface of the inner mold lower plate is in a "V" shape, and the lower surface of the inner mold upper plate is in an inverted "V" shape. The left end of the inner mold upper plate rests on the upper end of the inner mold left plate, and the right end rests on the upper end of the inner mold right plate. The lower end of the inner mold left plate is supported on the left end of the inner mold lower plate, and the lower end of the inner mold right plate is supported on the right end of the inner mold lower plate. The inner mold left plate and the inner mold right plate are connected together by a number of left and right telescopic connecting cylinders 45. An upper left hook strip 46 is provided on the left side of the front and rear ends of the upper plate of the inner mold, and an upper right hook strip 47 is provided on the right side. The upper left hook strip is parallel to the left half of the upper plate of the inner mold, and the upper right groove strip is parallel to the right half of the upper plate of the inner mold. An upper left hook head 48 hooked on the upper left hook strip is provided on the front and rear ends of the left plate of the inner mold, and an upper right hook head 49 hooked on the upper right hook strip is provided on the front and rear ends of the right plate of the inner mold; a lower left hook strip 50 is provided on the left side of the front and rear ends of the lower plate of the inner mold, and a lower right hook strip 51 is provided on the right side. The lower left hook strip is parallel to the left half of the lower plate of the inner mold, and the lower right groove strip is parallel to the right half of the lower plate of the inner mold. A lower left hook head 52 hooked on the lower left hook strip is provided on the front and rear ends of the left plate of the inner mold, and a lower right hook head 53 hooked on the lower right hook strip is provided on the front and rear ends of the right plate of the inner mold. When removing the inner mold, the upper connecting cylinder contracts to drive the left plate and the right plate of the inner mold to close. During the closing process of the left plate and the right plate of the inner mold, the hook head cooperates with the hooking strip to drive the upper plate and the lower plate of the inner mold to close, so that the inner mold is disengaged from the box beam 54 for removal.

[0035] In the specific process of box girder forming, concrete is poured into the box girder cavity. During the concrete pouring process, the opening and closing mold mechanism drives the outer mold side plate to move back and forth in the left and right directions so that the concrete is squeezed into the expansion groove through the feeding gap to improve the density of the lower corner of the box girder. After the concrete pouring is completed, the cutter drive cylinder drives the cutter bar to close so that the feeding gap is closed to achieve the disconnection of the concrete in the expansion groove from the concrete in the box girder cavity. After the concrete solidifies, the outer mold side plate is separated by the opening and closing mold mechanism, and then the outer mold end plate and the inner mold are removed, and the closing mechanism is opened to remove the concrete head formed by the concrete solidification in the expansion groove. The process of dismantling the box girder mold is as follows: when the concrete poured in the adjacent cavity is solidified to form a prefabricated box girder, the telescopic rod contracts to make the outer mold side plate move downward along the extension direction of the inclined track to achieve the detachment of the outer mold side plate, and then the inner mold is removed, and finally the outer mold end plate is removed.

[0036] After the concrete is poured into the box beam cavity, the booster plate is driven down by the booster plate lifting cylinder, so that the spring stores energy to the set value, and the booster plate is maintained in the current state. At this time, there is an avoidance gap between the booster plate and the inner plate. During the concrete solidification process, the inner plate can move synchronously regardless of the increase or decrease of the concrete volume; during the pouring of concrete, the inner plate is driven by the inner plate cylinder to make a reciprocating translation in the left and right directions.

[0037] During the process of pouring concrete into the box beam cavity, the concrete enters the expansion groove and squeezes the movable support plate outward to fill the expansion groove. During the process of disengaging the outer mold base plate, the swing motor first drives the swing arm to swing downward so that the pull plate pulls the reinforcement to pull out the telescopic concrete head, and then the outer mold base plate is removed; when the box beam is installed next time, the concrete head and reinforcement are removed from the movable support plate, and new reinforcement is installed for use. It can make it convenient, reliable and labor-saving to remove the concrete head. The reinforcement is fixed to the pull plate by connecting the pins, and the end of the reinforcement located in the expansion groove is provided with a hook head, and the surface of the movable support plate away from the pull plate is padded with a plastic film. During the process of dismantling the outer mold, the left vertical telescopic cylinder and the right vertical telescopic cylinder are contracted to realize the demoulding of the outer mold base plate, and at the same time, the outer mold base plate is disengaged from the inner side plate of the outer mold, providing an escape space for the demoulding process of the outer mold side plate tilting downward and separating.

Claims

1. A steam curing production line for concrete box beams, characterized in that: The invention comprises a track, a trolley slidably connected to the track, a curing room arranged at one end of the track and a box beam mold arranged at the other end of the track, the trolley comprising a trolley bottom plate, trolley running wheels arranged on the trolley bottom plate to support the trolley bottom plate on the track and a trolley driving motor arranged below the trolley bottom plate and driving the trolley running wheels, the trolley driving motor is connected to a power source through electric wires, a front elastic sealing sheet, a left elastic sealing sheet, a right elastic sealing sheet and a sealing curtain are arranged in the curing room, the upper end of the sealing curtain is sealed and connected to the top plate of the curing room, and the lower end is sealed and overlapped on the rear ends of the left elastic sealing sheet and the right elastic sealing sheet, when the trolley bottom plate is sealed and abutted against the front elastic sealing sheet, the left elastic sealing sheet and the right elastic sealing sheet, the sealing curtain is overlapped on the rear end of the trolley bottom plate, a steam nozzle for spraying steam toward the sealing room is arranged in the curing room, the air nozzle is located above the front elastic sealing sheet, a trolley entrance and exit doorway is arranged at the rear end of the curing room, and the track extends along the front-to-back direction.

2. The steam curing production line for concrete box beams according to claim 1, characterized in that: A heat preservation layer is arranged on the inner surface of the curing chamber, a steam delivery pipe is arranged in the heat preservation layer, and the steam nozzle is arranged on the steam delivery pipe.

3. A steam curing production line for concrete box beams according to claim 1 or 2, characterized in that: The steam nozzle is an electric valve structure. A push switch for controlling the steam nozzle is provided in the curing room. The push switch is a normally open switch. The push switch includes a switch body and a pressing head. When the trolley enters the curing room along the track and reaches the set position, the bottom plate of the trolley presses the pressing head. When the pressing head is pressed, the steam nozzle opens.

4. The steam curing production line for concrete box beams according to claim 3 is characterized in that: The pressing head is connected with a driving rod perpendicular to the track, and the trolley presses the pressing head through the driving rod.

5. A steam curing production line for concrete box beams according to claim 1 or 2, characterized in that: The box beam mold comprises an outer mold and an inner mold located inside the outer mold, a box beam cavity is formed between the outer mold and the inner mold, the outer mold comprises an outer mold bottom plate, two outer mold side plates and two outer mold end plates, the two outer mold side plates are detachably connected to the left and right sides of the outer mold bottom plate to form an outer mold groove, the two outer mold ends are closed at the two ends of the outer mold groove, the inner mold is a tubular structure, the two ends of the inner mold are passed through the two outer mold end plates, the outer mold bottom plate is supported on the trolley bottom plate, the two box beam side plates are connected to two opening and closing mold mechanisms one by one, the opening and closing mold mechanism comprises a fixed frame and one end A telescopic rod is hinged on a fixed frame, and the other end of the telescopic rod is connected to the outer mold side plate. The outer mold side plate is supported on the outer mold bottom plate. The outer mold bottom plate is provided with an expansion groove extending along the extension direction of the box beam. The expansion groove is provided with a feed gap extending along the extension direction of the box beam and located at the connection between the outer mold side plate and the outer bottom plate. The feed gap is communicated with the box beam cavity. A closing structure for closing the expansion groove is provided at the lower end of the expansion groove. A cutting strip for closing the feed gap and a cutting strip driving cylinder for driving the cutting strip to open and close are provided on the outer mold bottom plate.

6. The steam curing production line for concrete box beams according to claim 5, characterized in that: The mold opening and closing mechanism is provided with a plurality of inclined slide rails fixed on the ground perpendicular to the track and distributed in the extension direction of the track. The inclined slide rails are higher at one end of the track and lower at the other end. The lower end of the outer mold side plate is slidably connected to the inclined slide rails.

7. The steam curing production line for concrete box beams according to claim 6, characterized in that: The inclined slide rail is provided with an elongated sliding hole extending along the extension direction of the inclined slide rail, the elongated sliding hole is a through hole, the outer mold side plate is provided with a supporting foot supported on the inclined slide rail, the supporting foot is provided with a sliding rod passing through the elongated sliding hole, and the sliding rod is threadedly connected with a locking nut located below the inclined slide rail to prevent the sliding rod from falling out of the elongated sliding hole.

8. The steam curing production line for concrete box beams according to claim 5, characterized in that: It also includes a boost plate located above between the two outer mold side plates and a boost plate lifting cylinder for driving the boost plate to rise and fall, the outer mold side plates include an outer plate and an inner plate, the inner plate is connected to the outer plate through a transverse support spring, the outer plate is connected to the telescopic rod, the inner plate constitutes the groove wall of the outer mold groove, the inner plate is fixedly connected to an inner plate guide rod penetrating the outer plate, and the lower end of the inner plate is sealed and movably placed on the outer mold bottom plate when in the mold closing state, the opening and closing mold mechanism also includes an inner plate driving cylinder, the cylinder body of the inner plate driving cylinder is fixed to the outer plate, and the piston rod is connected to the inner plate through a clutch.

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