Box girder bottom die

Abstract

The utility model discloses a box girder bottom die which comprises a bottom die body, a plurality of web plates are hinged to the two sides of the top end of the bottom die body through hinges, sliding grooves are formed in the side walls of the web plates, scrapers are arranged in the sliding grooves in an attached and sliding mode, the bottom faces of the scrapers are attached to the top face of the bottom die body, a plurality of compression springs are arranged between the top faces of dovetail blocks and the web plates in an attached mode, and the compression springs are arranged in dovetail grooves. Each web supporting mechanism comprises a supporting frame fixed to the side wall of the corresponding web, the longitudinal section of each supporting frame is in a U shape, an opening of each supporting frame faces the corresponding web, the section of a cross rod at the bottom end of each supporting frame is an inclined face, and the inclined faces incline downwards in the direction away from the bottom die. The side wall of the web plate is slidably connected with the scraper plate through a mechanism for pushing the scraper plate to move, when the web plate rotates to be opened and closed with the bottom die, the web plate drives the scraper plate to move through the mechanism for pushing the scraper plate to move to clean the top face of the bottom die, the top face of the bottom die does not need to be specially cleaned manually, and the slurry leakage phenomenon is reduced.

Description

Technical Field:

[0001] The utility model relates to the technical field of molds, and particularly relates to a bottom formwork for a box girder. Background Art:

[0002] A box girder is a type of beam in bridge engineering. The inner cavity of the box girder is characterized by a particularly large inner cavity in the middle position, and there are webs on both upper sides, similar to a box. When the bridge span is large, the box girder is the best structural form. Its closed thin-walled section has a very large torsional stiffness, which is particularly beneficial for curved bridges and bridges constructed by cantilever method. The cast-in-place concrete raw materials are put into the bottom formwork of the box girder and dried, and then the formwork is put into use.

[0003] The existing bottom formwork of the box girder is mainly composed of a bottom formwork and multiple webs. During use, the webs are inserted into the top surface of the bottom formwork for splicing. When it is necessary to take out the formed formwork, first the webs are disassembled, and then the formed formwork is taken out. Stones and other impurities are likely to exist on the surface of the bottom formwork in contact with the webs, resulting in gaps in the connection between the top surface of the bottom formwork and the webs, and causing the phenomenon of mortar leakage. It is necessary to clean the top surface of the bottom formwork before splicing the webs each time, increasing the labor intensity. Content of the Utility Model:

[0004] Therefore, the purpose of the utility model is to provide a bottom formwork for a box girder to overcome the problems in the prior art that because the existing bottom formwork of the box girder is mainly composed of a bottom formwork and multiple webs, during use, the webs are inserted into the top surface of the bottom formwork for splicing. When it is necessary to take out the formed formwork, first the webs are disassembled, and then the formed formwork is taken out. Stones and other impurities are likely to exist on the surface of the bottom formwork in contact with the webs, resulting in gaps in the connection between the top surface of the bottom formwork and the webs, and causing the phenomenon of mortar leakage. It is necessary to clean the top surface of the bottom formwork before splicing the webs each time, increasing the labor intensity.

[0005] The utility model is implemented by the following technical solutions:

[0006] A bottom formwork for a box girder includes a bottom formwork. Both sides of the top end of the bottom formwork are hinged with multiple webs through hinges. A chute is opened on the side wall of the web. A scraper is slidably attached in the chute in a fitting manner. The bottom surface of the scraper is in contact with the top surface of the bottom formwork. A mechanism for pushing the scraper to move is fixedly connected between the side wall of the web and the scraper. A mechanism for supporting the web is fixedly connected to the side wall of the web.

[0007] Preferably, the bottom end of the side wall of the scraper away from the center of the bottom formwork is an outwardly convex arc surface.

[0008] Preferably, the mechanism for pushing the scraper to move includes a dovetail groove. The dovetail groove is opened on the side wall of the web and is communicated with the chute. A dovetail block is slidably attached in the dovetail groove in a fitting manner. The side wall of the dovetail block is fixedly connected to the side wall of the scraper. A plurality of compression springs are disposed in a fitting manner between the top surface of the dovetail block and the web. The compression springs are arranged in the dovetail groove.

[0009] Preferably, the mechanism for supporting the web includes a support frame fixed to the side wall of the web. The longitudinal section of the support frame is U-shaped with the opening facing the web, and a plurality of screw rods are screwed to the bottom surface of the support frame.

[0010] Preferably, the cross-section of the horizontal bar at the bottom end of the support frame is an inclined plane, and the inclined plane direction is inclined downward along the direction away from the bottom die.

[0011] Preferably, a T-shaped lead screw is arranged in the dovetail groove. The top end of the T-shaped lead screw sequentially passes through the through hole and the web and is rotatably connected to both of them. The through hole is opened on the surface of the dovetail block. A bearing is fixedly sleeved at the bottom end of the T-shaped lead screw, and the bearing is fixedly embedded in the web. A lead screw nut matching the T-shaped lead screw is sleeved on the T-shaped lead screw. The lead screw nut is arranged above the dovetail block. The outer cross-section of the lead screw nut is dovetail-shaped and is slidably arranged in the dovetail groove. The compression spring is arranged between the dovetail block and the lead screw nut and is attached to its surface.

[0012] Advantages of the present utility model: A plurality of webs are hinged to both sides of the top end of the bottom die through hinges. A scraper is slidably connected to the side wall of the web through a mechanism for moving the scraper. When the web rotates to open and close with the bottom die, the web drives the scraper to move through the mechanism for moving the scraper to clean the top surface of the bottom die, eliminating the need for manual special cleaning of the top surface of the bottom die and reducing the occurrence of slurry leakage. Description of the drawings:

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 Structural diagram of the present utility model;

[0015] Figure 2 Side view of the structure of the present utility model;

[0016] Figure 3 Stereogram of the present utility model;

[0017] Figure 4 Working schematic diagram of the structure of the present utility model and its partial enlarged view.

[0018] In the figure: bottom die 1, web 2, chute 3, scraper 4, dovetail groove 5, dovetail block 6, compression spring 7, lead screw nut 8, T-shaped lead screw 9, bearing 10, through hole 11, support frame 12, screw rod 13. Detailed implementation manners:

[0019] In order to make the objectives and advantages of the present utility model clearer and more understandable, the present utility model will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0020] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present utility model and do not limit the protection scope of the present utility model.

[0021] It should be noted that in the description of the present utility model, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0022] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0023] As Figures 1-4 shown, the present utility model provides the following technical solution: a bottom formwork for a box girder, including a bottom formwork 1. On both sides of the top end of the bottom formwork 1, a plurality of webs 2 are hinged through hinges. A chute 3 is opened on the side wall of the web 2. A scraping plate 4 is fitted and slidably arranged in the chute 3. The bottom surface of the scraping plate 4 is in contact with the top surface of the bottom formwork 1. A mechanism for pushing the scraping plate 4 to move is fixedly connected between the side wall of the web 2 and the scraping plate 4. A mechanism for supporting the web 2 is fixedly connected to the side wall of the web 2.

[0024] Please combine Figure 4 shown. During the use process, when injection molding is required, first rotate the mechanism for supporting the web 2. The mechanism for supporting the web 2 drives the web 2 to rotate so that the bottom surface of the web 2 gradually fits with the top surface of the bottom formwork 1. The web 2 drives the scraping plate 4 to rotate and slide on the top surface of the bottom formwork 1 through the mechanism for pushing the scraping plate 4 to move to clean the top surface thereof. There is no need for manual special cleaning of the top surface of the bottom formwork 1, reducing the occurrence of slurry leakage. The bottom formwork 1 pushes the scraping plate 4 to move and gradually enters the chute 3. When the bottom surface of the web 2 gradually fits with the top surface of the bottom formwork 1, stop rotating. Then operate the mechanism for supporting the web 2 to support the web 2. As Figure 1As shown, and then the grouting operation is carried out.

[0025] After forming the model, the formed model needs to be taken out. First, the staff operates the mechanism that supports the web 2 to cancel the support for the web 2, and then rotates the web 2. The web 2 drives the scraper 4 to rotate through the mechanism that drives the scraper 4 to move. The mechanism that drives the scraper 4 to move always drives the scraper 4 to move and fit with the top surface of the bottom mold 1. When the mechanism that supports the web 2 fits with the side wall of the bottom mold 1, the rotation stops, as Figure 4 shown, and then the model is taken out, and the grouting operation is carried out in the above manner.

[0026] The bottom end of the side wall of the scraper 4 far from the center of the bottom mold 1 is a convex arc surface, which increases the thickness of the contact surface between the scraper 4 and the top surface of the bottom mold 1 and prolongs the service life of the scraper 4.

[0027] Please refer to Figure 1 , Figure 2 , Figure 4 shown. For the embodiment of the mechanism that drives the scraper 4 to move, the mechanism that drives the scraper 4 to move includes a dovetail groove 5. The dovetail groove 5 is opened on the side wall of the web 2 and communicates with the chute 3. A dovetail block 6 is slidably fitted in the dovetail groove 5. The side wall of the dovetail block 6 is fixedly connected to the side wall of the scraper 4. A plurality of compression springs 7 are provided in contact between the top surface of the dovetail block 6 and the web 2, and the compression springs 7 are arranged in the dovetail groove 5.

[0028] Please refer to Figure 4 shown. During the use process, when mold injection is required, first rotate the mechanism that supports the web 2. The mechanism that supports the web 2 drives the web 2 to rotate so that the bottom surface of the web 2 gradually fits with the top surface of the bottom mold 1. The web 2 drives the dovetail block 6 to rotate, and the dovetail block 6 drives the scraper 4 to rotate and slide on the top surface of the bottom mold 1 to clean its top surface. There is no need for manual special cleaning of the top surface of the bottom mold 1, reducing the occurrence of slurry leakage. The bottom mold 1 drives the scraper 4 to move gradually into the chute 3, and the scraper 4 drives the dovetail block 6 to slide in the dovetail groove 5 and compress the compression springs 7 to deform. When the bottom surface of the web 2 gradually fits with the top surface of the bottom mold 1, the rotation stops, as Figure 1 shown.

[0029] After forming the model, the formed model needs to be taken out. First, the staff operates the mechanism that supports the web 2 to cancel the support for the web 2, and then rotates the web 2. The web 2 drives the dovetail block 6 to rotate, and the dovetail block 6 drives the scraper 4 to rotate. The compression springs 7 push the dovetail block 6 to move, and the dovetail block 6 drives the scraper 4 to always fit with the top surface of the bottom mold 1. When the mechanism that supports the web 2 fits with the side wall of the bottom mold 1, the rotation stops, as Figure 4 shown, and then the model is taken out, and the grouting operation is carried out in the above manner.

[0030] Please refer to Figure 1 , Figure 2As shown in the figure, an embodiment of the mechanism for supporting the web 2. The mechanism for supporting the web 2 includes a support frame 12 fixed to the side wall of the web 2. The longitudinal section of the support frame 12 is U-shaped and the opening faces the web 2. A plurality of screw rods 13 are screwed to the bottom surface of the support frame 12.

[0031] Please refer to Figure 4 As shown in the figure, during the use process, rotate the support frame 12. The support frame 12 drives the web 2 to rotate and gradually fit with the top surface of the bottom mold 1. Then rotate the screw rod 13. The screw rod 13 gradually rotates and moves so that the bottom end of the screw rod 13 gradually fits with the bottom surface and then stops moving. As Figure 1 shown in the figure.

[0032] After forming the model, it is necessary to take out the formed model. First, rotate the screw rod 13 to separate it from the bottom surface. Then rotate the support frame 12 to gradually fit with the side wall of the bottom mold 1 and then stop rotating. The support frame 12 drives the web 2 to rotate. As Figure 4 shown in the figure, and then take out the model.

[0033] The cross-section of the horizontal bar at the bottom end of the support frame 12 is an inclined plane and the inclined plane direction is inclined downward along the direction away from the bottom mold 1, increasing the contact area between the side wall of the support frame 12 and the side wall of the bottom mold 1 and improving the support strength of the support frame 12.

[0034] A T-shaped lead screw 9 is arranged in the dovetail groove 5. The top end of the T-shaped lead screw 9 sequentially passes through the through hole 11 and the web 2 and is rotatably connected to both of them. The through hole 11 is opened on the surface of the dovetail block 6. A bearing 10 is fixedly sleeved at the bottom end of the T-shaped lead screw 9, and the bearing 10 is fixedly embedded in the web 2. A lead screw nut 8 that matches the T-shaped lead screw 9 is sleeved on the T-shaped lead screw 9. The lead screw nut 8 is arranged above the dovetail block 6. The outer cross-section of the lead screw nut 8 is dovetail-shaped and is slidably arranged in the dovetail groove 5. A compression spring 7 is arranged between the dovetail block 6 and the lead screw nut 8 and is in contact with its surface.

[0035] Please refer to Figure 1 As shown in the figure, during the use process, when the elasticity of the compression spring 7 becomes loose after long-term use, rotate the T-shaped lead screw 9. The rotation of the T-shaped lead screw 9 drives the lead screw nut 8 to move and squeeze the compression spring 7 to increase its elasticity.

[0036] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bottom formwork for box girders, comprising a bottom formwork, characterized in that: On both sides of the top end of the bottom mold, a plurality of webs are hinged by hinges. A chute is formed in the side wall of the web. A scraper is slidably fitted in the chute. The bottom surface of the scraper is in contact with the top surface of the bottom mold. A mechanism for pushing the scraper to move is fixedly connected between the side wall of the web and the scraper. A mechanism for supporting the web is fixedly connected to the side wall of the web.

2. The bottom formwork of the box girder according to claim 1, characterized in that: The bottom end of the side wall of the scraper away from the center of the bottom mold is an outwardly convex arc surface.

3. The bottom formwork of the box girder according to claim 2, characterized in that: The mechanism for pushing the scraper to move includes a dovetail groove. The dovetail groove is formed in the side wall of the web and communicates with the chute. A dovetail block is slidably fitted in the dovetail groove. The side wall of the dovetail block is fixedly connected to the side wall of the scraper. A plurality of compression springs are fitted between the top surface of the dovetail block and the web. The compression springs are arranged in the dovetail groove.

4. The bottom formwork of the box girder according to any one of claims 1-3, characterized in that: The mechanism for supporting the web includes a support frame fixed to the side wall of the web. The longitudinal section of the support frame is U-shaped and the opening faces the web. A plurality of screws are screwed on the bottom surface of the support frame.

5. The bottom formwork of the box girder according to claim 4, characterized in that: The cross section of the horizontal bar at the bottom end of the support frame is an inclined surface and the inclined surface direction is inclined downward along the direction away from the bottom mold.

6. The bottom formwork of the box girder according to claim 3, characterized in that: A T-shaped lead screw is arranged in the dovetail groove. The top end of the T-shaped lead screw sequentially passes through a through hole and the web and is rotatably connected to both of them respectively. The through hole is formed on the surface of the dovetail block. The bottom end of the T-shaped lead screw is fixedly sleeved with a bearing. The bearing is fixedly embedded in the web. A lead screw nut matching with the T-shaped lead screw is sleeved on the T-shaped lead screw. The lead screw nut is arranged above the dovetail block. The outer cross section of the lead screw nut is dovetail-shaped and is slidably arranged in the dovetail groove. The compression spring is arranged between the dovetail block and the lead screw nut and is in contact with its surface.

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