Precast box girder assembly tensioning slot mold

Abstract

The application discloses a prefabricated box girder assembly type tensioning groove die and belongs to the field of prefabricated part pouring forming. The prefabricated box girder assembly type tensioning groove die comprises a bottom plate, two first connecting plates capable of synchronously and reversely sliding are arranged at the upper end of the bottom plate, and one first die plate is fixed on each of the two first connecting plates. A fixing frame is fixed on the bottom plate, two second connecting plates capable of synchronously and reversely sliding in the vertical direction are arranged on the fixing frame, one second die plate is fixed on each of the two second connecting plates, the two second die plates are capable of being close to each other to contact the upper and lower two sides of the first die plate, and a rectangular cavity is formed by the two second die plates and the first die plate, and the two second die plates are installed at the tensioning groove for pouring. After pouring is completed, the two first die plates and the two second die plates are controlled to be far away from each other to realize block demolding, so that the edge collapse of the tensioning groove concrete is reduced.

Description

Technical Field

[0001] This invention belongs to the field of precast casting and molding, specifically relating to precast box girder assembly tensioning slot mold. Background Technology

[0002] Precast box girders are a common type of bridge structure, and their fabrication involves multiple steps, with casting being a crucial one. Tensioning slots are an important structural component of precast box girders; they are temporary slots created to facilitate prestressing grouting and need to be sealed after grouting. The presence of tensioning slots is vital to the overall structural stability of the box girder. They not only provide a channel for the prestressing tendons, allowing them to be applied to the beam, but also affect the bridge's durability, stability, and safety.

[0003] However, in the existing technology, during the casting process of precast box girders, the tensioning slot is prone to chipping and poor appearance quality after demolding. Therefore, an assembled tensioning slot mold for precast box girders is proposed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a prefabricated box girder assembly tensioning slot mold, thereby solving the problems in the prior art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] The precast box girder assembly tensioning slot mold includes a base plate with two first connecting plates that can slide synchronously in opposite directions at the upper end of the base plate. Each of the two first connecting plates has a first template fixed to it. A fixing frame is fixed on the base plate, and two second connecting plates that can slide synchronously in opposite directions in the vertical direction are set on the fixing frame. Each of the two second connecting plates has a second template fixed to it. The two second templates are close to each other and can contact the upper and lower sides of the first template to form a rectangular cavity, which is then installed at the tensioning slot for pouring. After pouring, the two first templates and the two second templates are controlled to move away from each other to achieve segmented demolding, thereby reducing the edge breakage of the concrete at the tensioning slot.

[0007] Furthermore, the mounting bracket is fixed with a mounting plate, and the mounting plate is provided with a sliding plate that can be slidably adjusted. The sliding plate is provided with a calibration component and a scraper component. The calibration component and the scraper component can be moved to the center position of the mounting plate to align with the rectangular mold cavity, thereby calibrating the two first templates and cleaning the inner wall of the rectangular mold cavity.

[0008] Furthermore, a connecting block is provided on the sliding plate, and a telescopic rod is provided on the mounting plate, with the end of the drive shaft of the telescopic rod fixed to the connecting block;

[0009] The mounting plate is fixed with a first limiting block and a second limiting plate, and a connecting block is located between the first limiting block and the second limiting plate; and when the connecting block contacts the first limiting block, the calibration component is located at the center of the mounting plate and aligned with the rectangular mold cavity; when the connecting block contacts the second limiting block, the scraper assembly is located at the center of the mounting plate and aligned with the rectangular mold cavity.

[0010] Furthermore, the calibration assembly includes a first cylinder fixedly connected to the sliding plate. A support plate is fixed to the end of the drive shaft of the first cylinder. A roller is rotatably connected to each end of the support plate. When the calibration assembly reaches the center position of the mounting plate, the support plate can be positioned in the center between the two first templates under the drive of the first cylinder.

[0011] Furthermore, the scraper assembly includes a second cylinder fixed on the sliding plate, and a scraper is fixed on the drive shaft of the second cylinder. When the scraper assembly reaches the center position of the mounting plate, the scraper can enter the rectangular cavity under the drive of the second cylinder and contact and cooperate with the four side walls of the rectangular cavity.

[0012] Furthermore, a T-shaped groove is provided on the mounting plate, and a mating block is provided on the sliding plate to slide and engage with the T-shaped groove.

[0013] Furthermore, both of the first connecting plates are slidably connected to the base plate, and the base plate is provided with two first fixing plates. A first lead screw is rotatably connected between the two first fixing plates. The two ends of the first lead screw are respectively provided with a first external thread and a second external thread with opposite directions and equal pitch. The first external thread and the second external thread pass through the two first connecting plates and are threadedly connected to them.

[0014] Furthermore, the thread helix angle of both the first and second external threads is less than the equivalent friction angle.

[0015] Furthermore, both of the second connecting plates are slidably connected to the fixing frame in the vertical direction. The fixing frame is provided with two second fixing plates, and a second lead screw is rotatably connected between the two second fixing plates. The two ends of the second lead screw are respectively provided with a third external thread and a fourth external thread with opposite directions and equal pitch. The third external thread and the fourth external thread pass through the two second connecting plates and are threadedly connected to them.

[0016] Furthermore, the thread helix angles of the third and fourth external threads are both less than the equivalent friction angle.

[0017] The beneficial effects of this invention are:

[0018] 1. By controlling the two second templates to move closer to each other and surround the first template to form a rectangular cavity, the cavity is installed at the tensioning slot for pouring. After pouring, the two first templates and the two second templates are controlled to move away from each other to achieve segmented demolding, thereby reducing the edge collapse of the concrete at the tensioning slot.

[0019] 2. Before pouring, the calibration component is moved to the center of the mounting plate and the distance between the two first templates is calibrated to ensure the accuracy of the pouring dimensions.

[0020] 3. By setting up a scraper assembly, the concrete in the inner cavity of the rectangular cavity is scraped and cleaned. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the tensioning slot mold of the present invention;

[0023] Figure 2 This is a schematic diagram of the base plate structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the first template component of the present invention;

[0025] Figure 4 This is a schematic diagram of the second template component structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the second lead screw structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the calibration and cleaning mechanism of the present invention;

[0028] Figure 7 This is a schematic diagram of the calibration component structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the scraper assembly structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the mounting plate structure of the present invention;

[0031] Figure 10 This is a schematic diagram of the sliding plate structure of the present invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figure 1 As shown, the precast box girder assembly tensioning slot mold includes a base plate 1, and a first template assembly 2 and a second template assembly 3 are provided on the upper end of the base plate 1 to form a rectangular mold cavity for casting and forming the tensioning slot.

[0034] like Figure 3 As shown, the first template assembly 2 includes two first connecting plates 21 that can slide synchronously in opposite directions on the base plate 1. A first template 22 is fixed on each of the two first connecting plates 21 to adjust the distance between the two first templates 22.

[0035] In this embodiment, both first connecting plates 21 are slidably connected to the base plate 1, such as... Figure 2 As shown, two first fixing plates 11 are provided on the base plate 1, and a first lead screw 23 is rotatably connected between the two first fixing plates 11. The two ends of the first lead screw 23 are respectively provided with a first external thread 231 and a second external thread 232 with opposite directions and equal pitch. The first external thread 231 and the second external thread 232 pass through the two first connecting plates 21 and are threadedly connected to them. By rotating the first lead screw 23, the two first connecting plates 21 and even the two first templates 22 can slide synchronously in opposite directions.

[0036] Furthermore, in order to ensure that the distance between the two first templates 22 remains stable after adjustment, the first lead screw 23 needs to have self-locking properties, that is, the thread helix angle of the first external thread 231 and the second external thread 232 is less than the equivalent friction angle.

[0037] Of course, the methods of driving the two first connecting plates 21 to slide synchronously in opposite directions include, but are not limited to, the first lead screw 23 and other structures in this embodiment. In some embodiments, the two first connecting plates 21 can also be driven to slide synchronously in opposite directions by setting two cylinders on the base plate 1 respectively.

[0038] like Figure 4 As shown, the second template assembly 3 includes a fixing frame 34 fixed to the upper end of the base plate 1. The fixing frame 34 is provided with two second connecting plates 32 that can slide synchronously in opposite directions in the vertical direction. Each of the two second connecting plates 32 is fixed with a second template 33. The two second templates 33 approach each other synchronously and can fit with the upper and lower ends of the first template 22 respectively, thereby forming a rectangular mold cavity.

[0039] In this embodiment, both second connecting plates 32 are slidably connected to the fixing frame 31 in the vertical direction. The fixing frame 31 is provided with two second fixing plates 311, and a second lead screw 34 is rotatably connected between the two second fixing plates 311. Figure 5 As shown, the two ends of the second lead screw 34 are respectively provided with a third external thread 341 and a fourth external thread 342 with opposite directions and equal pitch. The third external thread 341 and the fourth external thread 342 pass through the two second connecting plates 32 and are threadedly connected to them. By rotating the second lead screw 34, the two second connecting plates 32 and even the two second templates 33 can be made to slide synchronously in opposite directions in the vertical direction.

[0040] Furthermore, in order to ensure that the positions of the two second templates 33 remain stable after adjustment, the second lead screw 34 also has self-locking properties, that is, the thread helix angles of the three external threads 341 and the fourth external thread 342 are both less than the equivalent friction angle.

[0041] Of course, the way to drive the two second connecting plates 32 to slide synchronously in opposite directions in the vertical direction includes, but is not limited to, the second lead screw 34 and other structures in this embodiment. In some embodiments, two cylinders can also be set on the fixed frame 31 to drive the second connecting plates 32 to slide synchronously in opposite directions in the vertical direction respectively.

[0042] Furthermore, in this embodiment, the fixing frame 31 and the base plate 1 are connected by bolts to achieve detachable fixing.

[0043] The fixed frame 31 is equipped with a calibration and cleaning mechanism 4, which can calibrate the distance between the two first templates 22 (the two second templates 33 only need to move until the sides of the first templates 22 are in contact, so the second templates do not need to be calibrated) to ensure that the enclosed rectangular cavity meets the design requirements; and the calibration and cleaning mechanism 4 can also scrape and clean the residual concrete adhering to the template surface after demolding.

[0044] like Figure 6 As shown, the calibration and cleaning mechanism 4 includes a mounting plate 41 fixed on a fixed frame 31. The mounting plate 41 is provided with a sliding plate 42 that can be slidably adjusted. The sliding plate 42 is provided with a calibration component 43 and a scraper component 44. By controlling the sliding plate 42 to slide, the calibration component 43 and the scraper component 44 can be moved to the center position of the mounting plate 41 to align with the rectangular mold cavity, thereby realizing the calibration of the two first templates 22 and the cleaning of the concrete inside the template.

[0045] In this embodiment, as Figure 9 and Figure 10As shown, a connecting block 422 is provided on the sliding plate 42, and a telescopic rod 45 is provided on the mounting plate 41. The end of the drive shaft of the telescopic rod 45 is fixed to the connecting block 422 and drives the sliding plate 42 to slide and adjust. A first limiting block 412 and a second limiting plate 413 are fixed on the mounting plate 41, and the connecting block 422 is located between the first limiting block 412 and the second limiting plate 413. When the connecting block 422 contacts the first limiting block 412, the calibration component 43 is located at the center of the mounting plate 41 and aligned with the rectangular mold cavity. When the connecting block 422 contacts the second limiting block 413, the scraper component 44 is located at the center of the mounting plate 41 and aligned with the rectangular mold cavity, so as to realize the switching between calibration and cleaning working states.

[0046] In addition, in order to ensure the stability of the sliding plate 42 sliding on the mounting plate 41, a T-shaped groove 411 is provided on the mounting plate 41, and a mating block 421 is provided on the sliding plate 42 to slide and engage with the T-shaped groove 411.

[0047] like Figure 7 As shown, the calibration component 43 includes a first cylinder 431 fixedly connected to the sliding plate 42. A support plate 432 is fixed to the end of the drive shaft of the first cylinder 431. A roller 433 is rotatably connected to both ends of the support plate 432. When the calibration component 43 reaches the center position of the mounting plate 41, under the drive of the first cylinder 431, the support plate 432 can be in the center position between the two first templates 22. At this time, by controlling the two first templates 22 to approach each other and simultaneously contact the two rollers 433, the distance between the two first templates 22 can be calibrated.

[0048] Furthermore, after the distance between the two first templates 22 is calibrated, the support plate 432 retracts under the drive of the first cylinder 431, and the roller 433 rolls back on the side of the first template 22 to reduce scratches on the inner wall of the first template 22, so as to ensure the casting quality.

[0049] like Figure 8 As shown, the scraper assembly 44 includes a second cylinder 441 fixed on the sliding plate 42. The scraper 442 is fixed on the drive shaft of the second cylinder 442. When the scraper assembly 44 reaches the center position of the mounting plate 41, under the drive of the second cylinder 441, the scraper 442 can enter the rectangular cavity and contact and cooperate with the four side walls of the rectangular cavity (i.e. the side walls of the two first templates 22 and the two second templates 33) to clean and scrape off the residual concrete on the templates.

[0050] Working principle:

[0051] Before pouring, the calibration component 43 is moved to the center of the mounting plate 41, and the distance between the two first templates 22 is calibrated. After calibration, the support plate 432 is removed to ensure the accuracy of the pouring dimensions. Then, the two second templates 33 are moved closer together to form a rectangular cavity with the first template 22, and this cavity is installed at the tensioning slot for pouring. After pouring, the two first templates 22 and the two second templates 33 are moved away from each other to achieve segmented demolding, thereby reducing the chipping of the concrete at the tensioning slot. After demolding, the mold is removed from the tensioning slot, and then the templates are moved back together to form a rectangular cavity. The scraper component 44 is used to scrape and clean the concrete inside the cavity.

[0052] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A prefabricated box girder assembly type tensioning groove die, comprising a bottom plate (1), characterized in that, The bottom plate (1) is provided with two first connecting plates (21) capable of synchronous reverse sliding at the upper end, and one first mold plate (22) is fixed on each of the two first connecting plates (21); the bottom plate (1) is fixed with a fixed frame (31), the fixed frame (31) is provided with two second connecting plates (32) capable of synchronous reverse sliding in the vertical direction, and one second mold plate (33) is fixed on each of the two second connecting plates (32), the two second mold plates (33) are close to each other and can contact the upper and lower sides of the first mold plate (22), and a rectangular cavity is formed by surrounding; The fixed frame (31) is fixed with a mounting plate (41), the mounting plate (41) is provided with a sliding plate (42) capable of sliding adjustment, the sliding plate (42) is provided with a calibration assembly (43) and a scraper assembly (44), the calibration assembly (43) and the scraper assembly (44) can be respectively moved to the center position of the mounting plate (41) and aligned with the rectangular cavity, so as to calibrate the two first mold plates (22) and clean the inner wall of the rectangular cavity; The sliding plate (42) is provided with a connecting block (422), and the mounting plate (41) is provided with a telescopic rod (45), and the driving shaft end of the telescopic rod (45) is fixed with the connecting block (422); The mounting plate (41) is fixed with a first limiting block (412) and a second limiting block (413), and the connecting block (422) is located between the first limiting block (412) and the second limiting block (413); and when the connecting block (422) is in contact with the first limiting block (412), the calibration assembly (43) is located at the center position of the mounting plate (41) and aligned with the rectangular cavity; when the connecting block (422) is in contact with the second limiting block (413), the scraper assembly (44) is located at the center position of the mounting plate (41) and aligned with the rectangular cavity; The calibration assembly (43) comprises a first air cylinder (431) fixedly connected with the sliding plate (42), a support plate (432) is fixed at the driving shaft end of the first air cylinder (431), and one roller (433) is rotatably connected to each end of the support plate (432); when the calibration assembly (43) reaches the center position of the mounting plate (41), the support plate (432) can be located in the middle position between the two first mold plates (22) under the drive of the first air cylinder (431); The scraper assembly (44) comprises a second air cylinder (441) fixed on the sliding plate (42), and a scraper (442) is fixed on the driving shaft of the second air cylinder (441); when the scraper assembly (44) reaches the center position of the mounting plate (41), the scraper (442) can enter the rectangular cavity and contact and cooperate with the four side walls of the rectangular cavity under the drive of the second air cylinder (441).

2. The prefabricated box girder assembly type tensioning groove die according to claim 1, characterized in that, A T-shaped sliding groove (411) is formed in the mounting plate (41), and a matching block (421) is arranged on the sliding plate (42) to slide with the T-shaped sliding groove (411).

3. The precast box girder assembly type tensioning groove die according to claim 1, characterized in that, Both of the first connecting plates (21) are in sliding connection with the bottom plate (1), the bottom plate (1) is provided with two first fixed plates (11), the first fixed plates (11) are in rotary connection with a first lead screw (23) between the two first fixed plates (11), the first lead screw (23) is provided with a first external thread (231) and a second external thread (232) with opposite rotation directions and equal pitches at two ends of the first lead screw (23), the first external thread (231) and the second external thread (232) respectively penetrate through the two first connecting plates (21) and are in threaded connection with the two first connecting plates (21).

4. The precast box girder assembly type tensioning groove die according to claim 3, characterized in that, The thread angles of the first external thread (231) and the second external thread (232) are all less than the equivalent friction angle.

5. The precast box girder assembly type tension groove notch die according to claim 1, characterized in that, Both of the second connecting plates (32) are in sliding connection with the fixing frame (31) in the vertical direction, the fixing frame (31) is provided with two second fixed plates (311), the second fixed plates (311) are in rotary connection with a second lead screw (34) between the two second fixed plates (311), the second lead screw (34) is provided with a third external thread (341) and a fourth external thread (342) with opposite rotation directions and equal pitches at two ends of the second lead screw (34), the third external thread (341) and the fourth external thread (342) respectively penetrate through the two second connecting plates (32) and are in threaded connection with the two second connecting plates (32).

6. The precast box girder assembly type tension groove joint mold according to claim 5, characterized in that, The thread angles of the third external thread (341) and the fourth external thread (342) are all less than the equivalent friction angle.

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