A box beam formwork structure and construction technology

Abstract

The present application discloses a box girder formwork structure and construction process, which relates to the technical field of box girder casting. The box girder formwork structure comprises a bottom formwork, two supporting trusses respectively installed on both sides of the bottom formwork, two outer formworks respectively installed on opposite sides of the two supporting trusses, two crossbeams respectively bolted to the two ends of the two supporting trusses, two end formworks respectively installed on the two crossbeams, and an inner formwork bolted to the two end formworks, both ends of the crossbeams are installed with a limit assembly for limiting the top of the inner formwork, and each group of the limit assembly comprises a mounting frame installed on one side of the crossbeam, an electric push rod installed on the mounting frame, and a limit rod fixed to the output end of the electric push rod; a first through hole for the limit rod to pass through is opened on the crossbeam, and the bottom of the limit rod abuts against the top of the inner formwork. The present application can reduce the possibility of deformation of the inner formwork.

Description

Technical Field

[0001] The present application relates to the technical field of box girder casting, and in particular to a box girder formwork structure and a construction process. Background Art

[0002] At present, with the continuous development of bridge construction, prefabricated box girders, as an important structural form, are widely used in various bridge projects. Prefabricated box girders refer to box-shaped girders that are prefabricated in factories or prefabrication sites according to design requirements. Their advantages are fast construction speed, controllable quality, and stable structural performance.

[0003] The box girder formwork structure in the related art generally includes a bottom formwork, two supporting trusses respectively installed on both sides of the bottom formwork, two outer formworks respectively installed on opposite sides of the two supporting trusses, two cross beams respectively bolted to both ends of the two supporting trusses, two end formworks respectively installed on the two cross beams and inner formworks bolted to the two end formworks.

[0004] However, the inner formwork has a certain length. When pouring concrete between the outer formwork and the inner formwork, the middle position of the inner formwork tends to bulge upwards under the pressure of the concrete. Summary of the invention

[0005] The present application provides a box girder formwork structure, which can reduce the possibility of deformation of the inner formwork, and adopts the following technical solutions:

[0006] A box girder formwork structure comprises a bottom formwork, two supporting trusses respectively installed on both sides of the bottom formwork, two outer formworks respectively installed on opposite sides of the two supporting trusses, two cross beams respectively bolted to the two ends of the two supporting trusses, two end formworks respectively installed on the two cross beams and an inner formwork bolted to the two end formworks, both ends of the cross beams are installed with limiting assemblies for limiting the top of the inner formwork, each group of the limiting assemblies comprises a mounting frame installed on one side of the cross beam, an electric push rod installed on the mounting frame and a limiting rod fixed to the output end of the electric push rod; a first through hole for the limiting rod to pass through is opened on the cross beam, and the bottom of the limiting rod abuts against the top of the inner formwork.

[0007] By adopting the above scheme, the two supporting trusses are first moved to connect the two outer formworks with the bottom formwork, and then the steel cage is tied on the bottom formwork and the outer formwork; then the two ends of the beam are respectively installed on the connecting rods of the two supporting trusses, and then the end formworks are connected by moving the end formworks, and then the two ends of the inner formwork are respectively connected to the two end formworks by moving the inner formwork, and then the steel cage is tied on the top of the inner formwork; next, the electric push rod is started, and at this time, the output end of the electric push rod drives the limit rod to move downward and abut against the top of the inner formwork; next, the concrete pump is started to pour concrete between the bottom formwork, the outer formwork and the inner formwork; at this time, under the action of the limit rod, the possibility of deformation of the inner formwork can be reduced.

[0008] Preferably, a plug plate is fixedly connected to the top of the end template, a slot for plugging the plug plate is opened on the crossbeam, two groups of fixing components for fixing the plug plate are installed on the crossbeam, and the two groups of fixing components are arranged corresponding to two limit rods; a card block is fixedly connected to the bottom of the end template, and a card slot for plugging the card block is opened on one side of the bottom template.

[0009] The end template can be installed by moving the plug-in board to engage with the slot and the card block to engage with the card slot, and then fixing the plug-in board through the fixing component; in summary, by adopting the above scheme, it is convenient to fix the end template.

[0010] Preferably, each group of the fixing components includes a second through hole opened on one side of the slot, and the two second through holes are respectively connected to the two first through holes; a limiting plate is slidably connected in the second through hole, and a limiting groove for the limiting plate to be plugged in is opened on one side of the plug plate; a driving ring is fixedly sleeved on the side wall of the limiting rod, and a slope is provided on one end of the limiting plate close to the driving ring; a reset member for separating the limiting plate from the limiting groove is installed on one side of the second through hole.

[0011] By adopting the above scheme, when the limit plate is plugged into the limit groove under the action of the driving ring, the limit plate drives the first sliding sleeve to move, and the first sliding sleeve moves to press the first spring; when the driving ring is reset upward under the action of the limit rod, the first sliding sleeve drives the limit plate to reset under the action of the first spring; the reset part is convenient for resetting the limit plate.

[0012] Preferably, the reset member includes a slide groove opened on one side of the second through hole, a guide rod fixed to the inner wall of the slide groove, a first slide sleeve slidably connected to the guide rod, and a first spring sleeved on the guide rod; the first slide sleeve is fixed to one side of the limit plate, one end of the first spring is fixed to one side of the first slide sleeve, and the other end is fixed to the inner wall of one end of the slide groove.

[0013] By adopting the above scheme, when the limit rod moves downward under the action of the output end of the electric push rod, it drives the driving ring to move downward, and then the driving ring drives the limit plate to be plugged into the limit groove under the action of the inclined surface, so that the plug plate can be limited, and then the end template can be fixed; in summary, the set fixing component facilitates the fixation of the end template.

[0014] Preferably, two vertical blocks are fixed to the top of the end template, and demoulding devices for demoulding the end template are respectively installed at both ends of the crossbeam. The two groups of demoulding devices respectively drive the two vertical blocks to move, and the two groups of demoulding devices are arranged corresponding to the two driving rings.

[0015] By adopting the above scheme, the demoulding device is provided to facilitate demoulding of the end template.

[0016] Preferably, each group of the demoulding devices includes a vertical plate installed on one side of the mounting frame, a horizontal plate fixed to the vertical plate, a vertical shaft rotatably connected to the horizontal plate, and a cam eccentrically connected to the vertical shaft; a second sliding sleeve is fixed to one side of the crossbeam, a push rod is slidably connected in the second sliding sleeve, one end of the push rod abuts against the circumferential surface of the cam, and the other end can abut against a side of the vertical block close to the crossbeam; a stopper is fixed to the bottom of the push rod, a second spring is fixed to the side of the stopper close to the second sliding sleeve, and an end of the second spring away from the stopper is fixed to a side of the second sliding sleeve away from the crossbeam; a driving mechanism for driving the vertical shaft to rotate is installed on the horizontal plate.

[0017] By adopting the above scheme, when the end template needs to be demoulded, the limit rod is first driven to move upward through the output end of the electric push rod, and the upward movement of the limit rod drives the driving ring to move upward, and then the vertical shaft rotates under the cooperation of the driving mechanism and the driving ring, and the rotation of the vertical shaft drives the cam to rotate, and then the push rod reciprocates under the action of the cam and the second spring, and the push rod reciprocates to drive the vertical block to move, and the movement of the vertical block can demould the end template; in summary, the demoulding device is convenient for demoulding the end template.

[0018] Preferably, the driving mechanism includes a vertical tube rotatably connected to the horizontal plate and a moving rod arranged in the vertical tube; the outer wall of the moving rod is sequentially provided with a plurality of spiral blocks along its circumference, and the inner wall of the vertical tube is sequentially provided with a plurality of spiral grooves along its circumference, and the plurality of spiral blocks are matched with the plurality of spiral grooves in a one-to-one manner; the outer wall of the vertical tube is fixedly connected to a first gear, and the outer wall of the vertical shaft is fixedly connected to a second gear, and the first gear is meshed with the second gear; the bottom of the moving rod is fixedly connected to an abutment plate, and the top of the driving ring can abut against the bottom of the abutment plate; a third spring is arranged between the abutment plate and the horizontal plate, a strip hole is opened on one side of the vertical plate, a vertical rod is fixed in the strip hole, and the abutment plate is slidably connected to the vertical rod.

[0019] By adopting the above scheme, the output end of the electric push rod drives the limit rod to move upward, the limit rod moves upward and drives the driving ring to move upward, the driving ring moves upward and drives the abutment plate to move upward, the abutment plate moves upward and drives the moving rod to move upward, at this time, the moving rod drives the vertical pipe to rotate under the action of multiple spiral blocks and multiple spiral grooves, the rotation of the vertical pipe drives the first gear to rotate, the rotation of the first gear drives the second gear to rotate, and the rotation of the second gear can drive the vertical shaft to rotate; the set driving mechanism is convenient for driving the vertical shaft to rotate.

[0020] Preferably, the supporting truss comprises a connecting rod, a third through hole is formed at one end of the crossbeam, the crossbeam is slidably connected to the connecting rod through the third through hole, and a supporting mechanism for supporting the crossbeam is mounted on the connecting rod.

[0021] By adopting the above solution, the supporting mechanism is provided, which facilitates supporting the crossbeam.

[0022] Preferably, the supporting mechanism includes a fixing ring fixedly connected to the outer wall of the connecting rod, and a recessed groove for inserting the fixing ring is provided at the bottom of the crossbeam; a plurality of vertical grooves are provided at the top of the fixing ring, a supporting plate is slidably connected in each of the vertical grooves, a fourth spring is fixedly connected to the bottom of the support plate, and one end of the fourth spring away from the support plate is fixedly connected to the bottom of the vertical groove.

[0023] By adopting the above solution, the support plate and the fourth spring are provided, so as to facilitate supporting the crossbeam.

[0024] The present application provides a construction process for a box beam formwork structure, which adopts the following technical solution:

[0025] A construction process for a box beam formwork structure comprises the following steps:

[0026] First, move the two supporting trusses to connect the two outer formworks with the bottom formwork, and then tie the steel cage on the bottom formwork and the outer formwork; then install the two ends of the beam on the connecting rods of the two supporting trusses respectively, and then move the end formwork to plug the plug plate into the slot and the clamping block into the clamping slot. When the clamping block is engaged with the clamping slot, the end formwork can be pre-fixed, and then move the inner formwork to connect the two ends of the inner formwork with the two end formworks respectively, and then tie the steel cage on the top of the inner formwork; next, start the electric push rod, at this time, the output end of the electric push rod drives the limit rod to move downward and abut against the top of the inner formwork, and further, when the limit rod moves downward, it drives the driving ring to move downward, and then the driving ring drives the limit plate to plug into the limit slot under the action of the inclined surface, so that the end formwork can be fixed; next, start the concrete pump to pour concrete between the bottom formwork, the outer formwork and the inner formwork.

[0027] In summary, this application has the following beneficial effects:

[0028] 1. First, move the two supporting trusses to connect the two outer templates with the bottom template, and then tie the steel cage on the bottom template and the outer template; then install the two ends of the beam on the connecting rods of the two supporting trusses respectively, and then connect the end templates by moving the end templates, and then move the inner template to connect the two ends of the inner template with the two end templates respectively, and then tie the steel cage on the top of the inner template; then start the electric push rod, and the output end of the electric push rod drives the limit rod to move downward to abut against the top of the inner template; then, start the concrete pump to pour concrete between the bottom template, the outer template and the inner template; at this time, under the action of the limit rod, the possibility of deformation of the inner template can be reduced;

[0029] 2. When the end template needs to be demoulded, the output end of the electric push rod is used to drive the limit rod to move upward, and the limit rod moves upward to drive the driving ring to move upward, and then the vertical shaft rotates under the cooperation of the driving mechanism and the driving ring, and the rotation of the vertical shaft drives the cam to rotate, and then the push rod reciprocates under the action of the cam and the second spring, and the push rod reciprocates to drive the vertical block to move, and the vertical block moves to demould the end template; In summary, the demoulding device is provided to facilitate demoulding of the end template;

[0030] 3. The output end of the electric push rod drives the limit rod to move upward, and the limit rod moves upward to drive the driving ring to move upward, and the driving ring moves upward to push the abutment plate to move upward, and the abutment plate moves upward to drive the moving rod to move upward. At this time, the moving rod drives the vertical pipe to rotate under the action of multiple spiral blocks and multiple spiral grooves, and the rotation of the vertical pipe drives the first gear to rotate, and the rotation of the first gear drives the second gear to rotate, and the rotation of the second gear can drive the vertical shaft to rotate; the set driving mechanism is convenient for driving the vertical shaft to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0032] Figure 2 This is a structural schematic diagram highlighting the limit assembly in the embodiment of the present application;

[0033] Figure 3 This is a structural schematic diagram highlighting the card block and the card slot in the embodiment of the present application;

[0034] Figure 4 This is a structural schematic diagram highlighting the fixing components in the embodiment of the present application;

[0035] Figure 5 This is a structural schematic diagram highlighting the demoulding device in the embodiment of the present application;

[0036] Figure 6 This is a structural schematic diagram highlighting the spiral block and the spiral groove in the embodiment of the present application;

[0037] Figure 7 This is a cross-sectional view highlighting the support mechanism in the embodiment of the present application.

[0038] Explanation of reference numerals: 1, bottom template; 11, slot; 2, support truss; 21, outer template; 22, connecting rod; 3, crossbeam; 31, slot; 32, bolt; 33, third through hole; 4, end template; 41, plug plate; 42, block; 43, vertical block; 5, inner template; 6, limit assembly; 61, mounting frame; 62, electric push rod; 63, limit rod; 64, first through hole; 7, fixing assembly; 71, second through hole; 72, limit plate; 721, inclined plane; 73, limit groove; 74, drive ring; 75, reset member; 751, slide groove; 752, guide rod; 753, first Sliding sleeve; 754, first spring; 8, demoulding device; 81, vertical plate; 811, strip hole; 812, vertical rod; 82, horizontal plate; 83, vertical shaft; 84, cam; 85, second sliding sleeve; 86, push rod; 87, stopper; 88, second spring; 89, driving mechanism; 891, vertical tube; 892, moving rod; 893, spiral block; 894, spiral groove; 895, first gear; 896, second gear; 897, abutment plate; 898, third spring; 9, supporting mechanism; 91, fixing ring; 92, sink groove; 93, vertical groove; 94, supporting plate; 95, fourth spring. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-7 This application is described in further detail.

[0040] The same parts are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper", "lower", "bottom" and "top" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0041] The present application discloses a box girder formwork structure, comprising a bottom formwork 1, two supporting trusses 2 respectively installed on both sides of the bottom formwork 1, two outer formworks 21 respectively installed on opposite sides of the two supporting trusses 2, two cross beams 3 respectively bolted to both ends of the two supporting trusses 2, two end formworks 4 respectively installed on the two cross beams 3 and an inner formwork 5 bolted to the two end formworks 4, and both ends of the cross beam 3 are installed with limiting components 6 for limiting the top of the inner formwork 5.

[0042] Each set of limiting components 6 includes a mounting frame 61 vertically mounted on one side of the beam 3, an electric push rod 62 vertically mounted on the mounting frame 61, and a limiting rod 63 vertically fixed to the output end of the electric push rod 62; a first through hole 64 for the limiting rod 63 to vertically pass through is opened on the beam 3, and the bottom of the limiting rod 63 abuts against the top of the inner template 5. First, move the two supporting trusses 2 to connect the two outer formworks 21 with the bottom formwork 1, and then tie the steel cage on the bottom formwork 1 and the outer formwork 21; then, install the two ends of the beam 3 on the connecting rods 22 of the two supporting trusses 2 respectively, and then connect the end formworks 4 by moving the end formworks 4, and then move the inner formwork 5 to connect the two ends of the inner formwork 5 with the two end formworks 4 respectively, and then tie the steel cage on the top of the inner formwork 5; then start the electric push rod 62, at this time, the output end of the electric push rod 62 drives the limit rod 63 to move downward and abut against the top of the inner formwork 5; next, start the concrete pump to pour concrete between the bottom formwork 1, the outer formwork 21 and the inner formwork 5; at this time, under the action of the limit rod 63, the possibility of deformation of the inner formwork 5 can be reduced.

[0043] The top of the end template 4 is horizontally fixed with a plug plate 41, and the cross beam 3 is provided with a slot 31 for plugging the plug plate 41. Two sets of fixing components 7 for fixing the plug plate 41 are installed on the cross beam 3, and the two sets of fixing components 7 are arranged corresponding to the two limit rods 63; the bottom of the end template 4 is fixed with a clamping block 42, and one side of the bottom template 1 is provided with a clamping slot 11 for clamping the clamping block 42. The end template 4 is moved to plug the plug plate 41 with the slot 31 and the clamping block 42 with the clamping slot 11, and then the plug plate 41 is fixed by the fixing component 7, so that the end template 4 can be installed; in summary, by adopting the above scheme, it is convenient to fix the end template 4.

[0044] Each group of fixing components 7 includes a second through hole 71 horizontally opened on one side of the slot 31, and the two second through holes 71 are respectively connected to the two first through holes 64; a limiting plate 72 is slidably connected in the second through hole 71 along the length direction of the beam 3, and a limiting groove 73 for the limiting plate 72 to be inserted is opened on one side of the plug plate 41; a driving ring 74 is fixedly sleeved on the side wall of the limiting rod 63, and a slope 721 is provided on one end of the limiting plate 72 close to the driving ring 74; when the bottom of the limiting rod 63 abuts against the top of the inner template 5, the outer peripheral surface of the limiting ring abuts against the end of the limiting plate 72 away from the plug plate 41; a reset member 75 for separating the limiting plate 72 from the limiting groove 73 is installed on one side of the second through hole 71. When the limit plate 72 is plugged into the limit groove 73 under the action of the drive ring 74, the limit plate 72 drives the first sliding sleeve 753 to move, and the first sliding sleeve 753 moves to press the first spring 754; when the drive ring 74 is reset upward under the action of the limit rod 63, the first sliding sleeve 753 drives the limit plate 72 to reset under the action of the first spring 754; the reset member 75 is provided to facilitate the reset of the limit plate 72.

[0045] The reset member 75 includes a slide groove 751 provided at one side of the second through hole 71, a guide rod 752 horizontally fixed to the inner wall of the slide groove 751, a first sleeve 753 slidably connected to the guide rod 752 along the length direction of the beam 3, and a first spring 754 sleeved on the guide rod 752; the first sleeve 753 is fixed to one side of the limit plate 72, the first spring 754 is arranged along the length direction of the beam 3, one end of the first spring 754 is fixed to one side of the first sleeve 753, and the other end is fixed to the inner wall of one end of the slide groove 751. When the limit rod 63 moves downward under the action of the output end of the electric push rod 62, it drives the driving ring 74 to move downward, and then the driving ring 74 drives the limit plate 72 to be plugged into the limit groove 73 under the action of the inclined surface 721, so that the plug plate 41 can be limited, and then the end template 4 can be fixed; in summary, the fixed assembly 7 is provided to facilitate the fixing of the end template 4.

[0046] Two vertical blocks 43 are vertically fixed to the top of the end template 4, and demoulding devices 8 for demoulding the end template 4 are respectively installed at both ends of the crossbeam 3. The two groups of demoulding devices 8 drive the two vertical blocks 43 to move respectively, and the two groups of demoulding devices 8 are arranged corresponding to the two driving rings 74. The demoulding devices 8 are arranged to facilitate demoulding the end template 4.

[0047] Each group of demoulding devices 8 includes a vertical plate 81 installed on one side of the mounting frame 61, a horizontal plate 82 horizontally fixed to the vertical plate 81, a vertical shaft 83 rotatably connected to the horizontal plate 82 through a bearing, and a cam 84 eccentrically connected to the vertical shaft 83; a second sliding sleeve 85 is fixed to one side of the crossbeam 3, and a push rod 86 is slidably connected in the second sliding sleeve 85 along the width direction of the crossbeam 3, one end of the push rod 86 abuts against the circumferential surface of the cam 84, and the other end can abut against the side of the vertical block 43 close to the crossbeam 3; a stopper 87 is fixed to the bottom of the push rod 86, and a second spring 88 is fixed to the side of the stopper 87 close to the second sliding sleeve 85, and one end of the second spring 88 away from the stopper 87 is fixed to the side of the second sliding sleeve 85 away from the crossbeam 3; a driving mechanism 89 for driving the vertical shaft 83 to rotate is installed on the horizontal plate 82. When the end template 4 needs to be demoulded, the limit rod 63 is first driven to move upward through the output end of the electric push rod 62. The limit rod 63 moves upward and drives the drive ring 74 to move upward. Then, the vertical shaft 83 rotates under the cooperation of the drive mechanism 89 and the drive ring 74. The rotation of the vertical shaft 83 drives the cam 84 to rotate. Then, the push rod 86 reciprocates under the action of the cam 84 and the second spring 88. The push rod 86 reciprocates and drives the vertical block 43 to move. The vertical block 43 moves to demould the end template 4. In summary, the demoulding device 8 is provided to facilitate the demoulding of the end template 4.

[0048] The driving mechanism 89 includes a vertical tube 891 rotatably connected to the horizontal plate 82 through a bearing and a moving rod 892 vertically arranged in the vertical tube 891; the outer wall of the moving rod 892 is sequentially provided with a plurality of spiral blocks 893 along its circumference, and the inner wall of the vertical tube 891 is sequentially provided with a plurality of spiral grooves 894 along its circumference, and the plurality of spiral blocks 893 are matched with the plurality of spiral grooves 894 in a one-to-one correspondence; the outer wall of the vertical tube 891 is fixedly connected with a first gear 895, and the outer wall of the vertical shaft 83 is fixedly connected with a second gear 896, and the first gear 895 and the second gear 896 are fixedly connected. The wheels 896 are meshed with each other; the bottom of the moving rod 892 is horizontally fixed with an abutment plate 897, and the top of the driving ring 74 can abut against the bottom of the abutment plate 897; a third spring 898 is arranged between the abutment plate 897 and the horizontal plate 82, and the two ends of the third spring 898 are respectively fixed to the relative inner sides of the abutment plate 897 and the horizontal plate 82, and a strip hole 811 is opened on one side of the vertical plate 81, and a vertical rod 812 is vertically fixed in the strip hole 811, and the vertical rod 812 passes through the abutment plate 897, and the abutment plate 897 is slidably connected to the vertical rod 812. The output end of the electric push rod 62 drives the limit rod 63 to move upward, and the limit rod 63 moves upward to drive the drive ring 74 to move upward, and the drive ring 74 moves upward to push the abutment plate 897 to move upward, and the abutment plate 897 moves upward to drive the moving rod 892 to move upward. At this time, the moving rod 892 drives the vertical pipe 891 to rotate under the action of multiple spiral blocks 893 and multiple spiral grooves 894, and the rotation of the vertical pipe 891 drives the first gear 895 to rotate, and the rotation of the first gear 895 drives the second gear 896 to rotate, and the rotation of the second gear 896 can drive the vertical shaft 83 to rotate; the set driving mechanism 89 is convenient for driving the vertical shaft 83 to rotate.

[0049] The support truss 2 includes a vertically arranged connecting rod 22, and the cross beam 3 is bolted to the connecting rod 22 through a plurality of bolts 32. A third through hole 33 is provided at one end of the cross beam 3, and the cross beam 3 is vertically slidably connected to the connecting rod 22 through the third through hole 33. A supporting mechanism 9 for supporting the cross beam 3 is installed on the connecting rod 22. The provided supporting mechanism 9 facilitates supporting the cross beam 3.

[0050] The support mechanism 9 includes a fixing ring 91 fixed to the outer wall of the connecting rod 22, a sink groove 92 for inserting the fixing ring 91 is provided at the bottom of the cross beam 3, and the sink groove 92 is annular; a plurality of vertical grooves 93 are provided at the top of the fixing ring 91, and a support plate 94 is connected to each vertical groove 93 along the vertical sliding direction, and a fourth spring 95 is vertically fixed to the bottom of the support plate 94, and one end of the fourth spring 95 away from the support plate 94 is fixed to the bottom of the vertical groove 93. The support plate 94 and the fourth spring 95 are provided to facilitate supporting the cross beam 3.

[0051] The present application discloses a construction process of a box beam formwork structure, comprising the following steps:

[0052] First, move the two supporting trusses 2 to connect the two outer templates 21 with the bottom template 1, and then tie the steel cage on the bottom template 1 and the outer template 21; then install the two ends of the beam 3 on the connecting rods 22 of the two supporting trusses 2 respectively, and then move the end template 4 to plug the plug plate 41 into the slot 31 and the clamping block 42 into the clamping slot 11. When the clamping block 42 is clamped into the clamping slot 11, the end template 4 can be pre-fixed, and then move the inner template 5 to connect the two ends of the inner template 5 with the two end templates 4 respectively, and then The steel cage is tied at the top of the inner template 5; next, the electric push rod 62 is started, and the output end of the electric push rod 62 drives the limit rod 63 to move downward and abut against the top of the inner template 5. Furthermore, when the limit rod 63 moves downward, it drives the driving ring 74 to move downward, and then the driving ring 74 drives the limit plate 72 to engage with the limit groove 73 under the action of the inclined surface 721, so that the end template 4 can be fixed; next, the concrete pump is started to pour concrete between the bottom template 1, the outer template 21 and the inner template 5.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A box girder formwork structure, comprising a bottom formwork (1), two supporting trusses (2) respectively installed on both sides of the bottom formwork (1), two outer formworks (21) respectively installed on opposite sides of the two supporting trusses (2), two cross beams (3) respectively bolted to both ends of the two supporting trusses (2), two end formworks (4) respectively installed on the two cross beams (3) and an inner formwork (5) bolted to the two end formworks (4), characterized in that: Both ends of the crossbeam (3) are provided with limit assemblies (6) for limiting the top of the inner template (5), and each set of the limit assemblies (6) comprises a mounting frame (61) mounted on one side of the crossbeam (3), an electric push rod (62) mounted on the mounting frame (61), and a limit rod (63) fixed to the output end of the electric push rod (62); a first through hole (64) for the limit rod (63) to pass through is provided on the crossbeam (3), and the bottom of the limit rod (63) abuts against the top of the inner template (5); A plug plate (41) is fixedly connected to the top of the end template (4); a slot (31) for plugging the plug plate (41) is provided on the cross beam (3); two groups of fixing components (7) for fixing the plug plate (41) are installed on the cross beam (3); the two groups of fixing components (7) are arranged corresponding to two limit rods (63); a clamping block (42) is fixedly connected to the bottom of the end template (4); a clamping groove (11) for clamping the clamping block (42) is provided on one side of the bottom template (1); Each group of the fixing components (7) comprises a second through hole (71) provided on one side of the slot (31), and the two second through holes (71) are respectively connected to the two first through holes (64); a limiting plate (72) is slidably connected in the second through hole (71), and a limiting groove (73) for inserting the limiting plate (72) is provided on one side of the plug plate (41); a driving ring (74) is sleeved and fixed on the side wall of the limiting rod (63), and an inclined surface (721) is provided on one end of the limiting plate (72) close to the driving ring (74); a reset member (75) for separating the limiting plate (72) from the limiting groove (73) is installed on one side of the second through hole (71); The reset member (75) comprises a slide groove (751) opened on one side of the second through hole (71), a guide rod (752) fixedly connected to the inner wall of the slide groove (751), a first sliding sleeve (753) slidably connected to the guide rod (752), and a first spring (754) sleeved on the guide rod (752); the first sliding sleeve (753) is fixedly connected to one side of the limit plate (72); one end of the first spring (754) is fixedly connected to one side of the first sliding sleeve (753), and the other end is fixedly connected to the inner wall of one end of the slide groove (751); Two vertical blocks (43) are fixedly connected to the top of the end template (4), and demoulding devices (8) for demoulding the end template (4) are respectively installed at both ends of the crossbeam (3), and two groups of demoulding devices (8) respectively drive the two vertical blocks (43) to move, and the two groups of demoulding devices (8) are arranged corresponding to the two driving rings (74); Each group of demoulding devices (8) comprises a vertical plate (81) mounted on one side of the mounting frame (61), a horizontal plate (82) fixedly connected to the vertical plate (81), a vertical shaft (83) rotatably connected to the horizontal plate (82), and a cam (84) eccentrically connected to the vertical shaft (83); a second sliding sleeve (85) is fixedly connected to one side of the crossbeam (3), a push rod (86) is slidably connected in the second sliding sleeve (85), and one end of the push rod (86) abuts against the periphery of the cam (84). The push rod (86) has one end fixedly connected to the vertical block (43) and the other end thereof can abut against a side of the vertical block (43) close to the cross beam (3); a stopper (87) is fixedly connected to the bottom of the push rod (86); a second spring (88) is fixedly connected to a side of the stopper (87) close to the second sliding sleeve (85); an end of the second spring (88) away from the stopper (87) is fixedly connected to a side of the second sliding sleeve (85) away from the cross beam (3); a driving mechanism (89) for driving the vertical shaft (83) to rotate is installed on the horizontal plate (82); The driving mechanism (89) comprises a vertical tube (891) rotatably connected to the horizontal plate (82) and a moving rod (892) arranged in the vertical tube (891); the outer wall of the moving rod (892) is provided with a plurality of spiral blocks (893) in sequence along its circumference, the inner wall of the vertical tube (891) is provided with a plurality of spiral grooves (894) in sequence along its circumference, and the plurality of spiral blocks (893) are matched with the plurality of spiral grooves (894) in a one-to-one correspondence; the outer wall of the vertical tube (891) is fixedly connected with a first gear (895), and the outer wall of the vertical shaft (83) is fixedly connected with a first gear (895). A second gear (896) is connected, and the first gear (895) is meshed with the second gear (896); the bottom of the moving rod (892) is fixedly connected with an abutment plate (897), and the top of the driving ring (74) can abut against the bottom of the abutment plate (897); a third spring (898) is arranged between the abutment plate (897) and the horizontal plate (82), and a strip hole (811) is opened on one side of the vertical plate (81), and a vertical rod (812) is fixed in the strip hole (811), and the abutment plate (897) is slidably connected to the vertical rod (812).

2. A box girder formwork structure according to claim 1, characterized in that: The supporting truss (2) comprises a connecting rod (22), a third through hole (33) is provided at one end of the cross beam (3), the cross beam (3) is slidably connected to the connecting rod (22) via the third through hole (33), and a supporting mechanism (9) for supporting the cross beam (3) is installed on the connecting rod (22).

3. A box girder formwork structure according to claim 2, characterized in that: The support mechanism (9) comprises a fixing ring (91) fixedly connected to the outer wall of the connecting rod (22); a sink groove (92) for inserting the fixing ring (91) is provided at the bottom of the cross beam (3); a plurality of vertical grooves (93) are provided at the top of the fixing ring (91); a supporting plate (94) is slidably connected in each of the vertical grooves (93); a fourth spring (95) is fixedly connected to the bottom of the supporting plate (94); and one end of the fourth spring (95) away from the supporting plate (94) is fixedly connected to the bottom of the vertical groove (93).

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