Cast-in-place prestressed concrete small box girder inner mold

Abstract

The utility model belongs to the technical field of bridge construction, and particularly relates to a cast-in-place prestressed concrete small box girder inner mold which comprises a mold plate, the mold plate is provided with a conversion plate connected in a rotating mode, a plurality of installation grooves are formed in the upper portion of the inner plate wall of the conversion plate, and a rolling assembly is installed in each installation groove. The rolling assembly comprises an inserting column, one end of the inserting column extends into the mounting groove and is in sliding connection with the mounting groove, a steel ball in rotating connection is embedded in the other end of the inserting column, a spring is mounted in the mounting groove, and the two ends of the spring are fixedly connected with the inner groove wall of the mounting groove and the inserting end of the inserting column respectively. According to the cast-in-place prestressed concrete small box girder inner mold, the abrasion between the inner mold and a concrete surface is reduced, and the damping generated when the inner mold slides outwards along the concrete surface is also reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, in particular to an inner formwork for a cast-in-place prestressed concrete small box beam. Background Art

[0002] The prefabricated inner formwork used for box girders is segmented assembly type, with more components in a single segment, and all components in a single segment are connected by bolts; after the inner formwork is assembled, vertical supports need to be added separately to increase the structural strength of the inner formwork. The assembly process is labor-intensive, time-consuming, labor-intensive, and costly. When the inner formwork is dismantled, workers first enter the box chamber to dismantle all vertical supports and connecting bolts, and then manually separate the various components of the inner formwork from the concrete surface inside the box chamber and transport them out of the box chamber. There are many inner formwork components, and the workload of removing bolts and supports is large. In addition, when the various components of the inner formwork are separated from the concrete surface and freely fall to the bottom plate inside the box chamber, there is a great safety hazard for workers, and the safety risk is high.

[0003] In view of the above problems, Chinese patent CN212859854U proposes a convenient pull-out inner mold for box girder prefabrication. In the related technology, it is disclosed that the inner mold frame body includes two half-mold frames placed opposite to each other on the left and right, the two half-mold frames are connected by a connecting plate, and a pull-out device is arranged in each half-mold frame. The half-mold frame is formed by connecting an upper inner mold and a lower inner mold. The upper inner mold and the lower inner mold are connected by a hinge device, and the transverse connecting channel steel is slowly pulled by a winch to drive the upper support rod of the inner mold, the lower support rod of the inner mold and the concrete surface layer of the prefabricated box girder box chamber to separate, and the upper inner mold sinks, thereby reducing the volume of the inner mold for easy external pulling. However, when the volume of the inner mold is reduced, the outer wall of the inner mold will slide outward along the concrete surface and wear will occur. On the one hand, it is easy to cause wear to the outer plate wall of the inner mold and the concrete surface. On the other hand, due to the large damping when the outer plate wall of the inner mold slides outward along the concrete surface, it will delay the external sliding. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides a cast-in-place prestressed concrete small box beam inner mold, which can reduce the wear between the inner mold and the concrete surface and reduce the damping when the inner mold slides outward along the concrete surface.

[0005] The cast-in-place prestressed concrete small box beam inner mold provided by the utility model comprises a mold plate, a rotating cavity is opened on the plate wall of the mold plate, and a rotatably connected conversion plate is installed in the rotating cavity, a rotating shaft is inserted in the middle of the conversion plate, and the rotating shaft is installed in the installation holes opened on the two side walls of the rotating cavity;

[0006] A plurality of mounting grooves are provided above the inner wall of the conversion plate, and a rolling assembly is installed in each of the mounting grooves, and the rolling assembly includes an insertion column, one end of the insertion column is inserted into the mounting groove and slidably connected to the mounting groove, and the other end of the insertion column is embedded with a rotatably connected steel ball, a spring is installed in the mounting groove, and the two ends of the spring are respectively fixedly connected to the inner groove wall of the mounting groove and the insertion end of the insertion column;

[0007] Two symmetrically distributed collars are fixedly embedded below the inner wall of the conversion plate;

[0008] The inner plate wall of the template is provided with elastic limiting parts and fixing rings which are distributed up and down.

[0009] Preferably, two groups of the elastic limiting members are provided, and the two groups of the elastic limiting members are distributed on the inner side of the template and located above the rotating cavity.

[0010] Preferably, the elastic limiting member includes a sleeve, one end of which is rotatably mounted on the inner wall of the template via a rotating frame, and a sliding rod is inserted into the sleeve, the other end of the sliding rod extends out of the sleeve and is fixedly mounted with a sleeve joint, and a compression spring is installed in the sleeve.

[0011] Preferably, one end of the compression spring is fixedly connected to the inner wall of the sleeve, and the other end of the compression spring is fixedly connected to the insertion end of the sliding rod.

[0012] Preferably, two fixing rings are provided, and the two fixing rings are fixedly embedded below the inner plate wall of the template and are located on both sides of the rotating cavity.

[0013] Preferably, an insertion rod is inserted between the two rings, and threaded sections are provided on both sides of the insertion rod, and a threaded nut is sleeved on each threaded section.

[0014] Preferably, the upper and lower end surfaces of the rotating cavity opened by the template are both provided with downward inclined surfaces tilted downward from the inside of the plate to the outside of the plate, and the upper and lower end surfaces of the conversion plate are respectively provided with inclined end surfaces tilted downward from the inside of the plate to the outside of the plate.

[0015] Compared with the related art, the cast-in-place prestressed concrete small box girder inner mold provided by the utility model has the following beneficial effects:

[0016] The utility model provides an inner mold for a cast-in-place prestressed concrete small box beam. Under the elastic force of a compression spring in a sleeve, a sliding rod is driven to limit a conversion plate to prevent the conversion plate from deflecting inwards, and the conversion plate provided with a rolling component rotates inwards to the outside of the template. Therefore, when a winch slowly pulls the inner mold to slide outwards, since steel balls tilt outwards to the outside of the conversion plate, when the inner mold is pulled outwards, the steel balls slide outwards along the concrete surface, thereby greatly reducing the wear between the inner mold and the concrete surface, and also reducing the damping when the inner mold slides outwards along the concrete surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure inside the template when the conversion plate on the template of the utility model rotates and closes;

[0018] Figure 2 It is a schematic diagram of the external structure of the template when the conversion plate on the template of the utility model rotates and closes;

[0019] Figure 3 It is a schematic diagram of the structure inside the template when the conversion plate on the template of the utility model is rotated and opened;

[0020] Figure 4 It is a schematic diagram of the external structure of the template when the conversion plate on the template of the utility model is rotated and opened;

[0021] Figure 5 for Figure 4 A schematic diagram of the structure when the template and the conversion plate are separated;

[0022] Figure 6 for Figure 5 A schematic diagram of the structure of the rolling assembly shown;

[0023] Figure 7 for Figure 1 A schematic cross-sectional structure diagram of the elastic limiting member is shown.

[0024] Numbers in the figure: 1. Template; 1a. Rotating cavity; 1b. Mounting hole; 11. Downward inclined surface; 2. Conversion plate; 2a. Mounting groove; 21. Ring; 22. Inclined end surface; 23. Rotating shaft; 3. Rolling assembly; 31. Inserting column; 32. Steel ball; 33. Spring; 4. Elastic limiter; 41. Sleeve; 42. Sliding rod; 43. Sleeve joint; 44. Compression spring; 5. Inserting rod; 51. Nut; 6. Fixing ring. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0027] See also Figures 1 to 7The utility model embodiment provides a cast-in-place prestressed concrete small box girder inner mold, which includes: a mold 1, a conversion plate 2, and a rolling assembly 3. A rotating cavity 1a is opened on the plate wall of the mold 1, and a rotatably connected conversion plate 2 is installed in the rotating cavity 1a. A rotating shaft 23 is inserted in the middle of the conversion plate 2, and the rotating shaft 23 is installed in the installation holes 1b opened on the two side walls of the rotating cavity 1a.

[0028] In the embodiments of the present invention, please refer to Figure 1 and Figure 2 , two symmetrically distributed collars 21 are fixedly embedded under the inner wall of the conversion plate 2, and elastic limiters 4 and fixing rings 6 are installed on the inner wall of the template 1, and two fixing rings 6 are provided, and the two fixing rings 6 are fixedly embedded under the inner wall of the template 1 and located on both sides of the rotating cavity 1a, and an insertion rod 5 is inserted between the two collars 21, and threaded sections are provided on both sides of the insertion rod 5, and a threaded nut 51 is sleeved on each thread section;

[0029] When the conversion plate 2 rotates into the rotating chamber 1 a and seals the rotating chamber 1 a , the sleeve ring 21 is coaxially arranged with the fixing ring 6 .

[0030] It should be noted that when the formwork of the small box beam inner formwork is poured with concrete, the conversion plate 2 is rotated so that the conversion plate 2 seals the rotation cavity 1a, and the insertion rod 5 is passed through the fixing ring 6 and the sleeve ring 21 on the inner wall of the conversion plate 2, and then it is tightened with the nut 51, thereby completing the fixing of the conversion plate 2, so that the concrete small box beam inner formwork is supported and poured (as shown in the attached figure). Figure 1 and attached Figure 2 shown);

[0031] Among them, the upper and lower end surfaces of the rotating cavity 1a opened in the template 1 are both provided with a downward inclined surface 11 inclined downward from the inside of the plate to the outside of the plate, and the upper and lower end surfaces of the conversion plate 2 are respectively provided with inclined end surfaces 22 inclined downward from the inside of the plate to the outside of the plate, so that when the conversion plate 2 is rotated into the rotating cavity 1a, it can be better sealed, and the rotation angle of the conversion plate 2 is also limited.

[0032] In the embodiments of the present invention, please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7The elastic stopper 4 includes a sleeve 41, one end of which is rotatably mounted on the inner wall of the template 1 through a rotating frame, and a sliding rod 42 is inserted into the sleeve 41, the other end of the sliding rod 42 extends out of the sleeve 41 and is fixedly mounted with a sleeve joint 43, and a compression spring 44 is installed in the sleeve 41, and one end of the compression spring 44 is fixedly connected to the inner wall of the sleeve 41, and the other end of the compression spring 44 is fixedly connected to the inserted end of the sliding rod 42;

[0033] A plurality of mounting grooves 2a are provided above the inner wall of the conversion plate 2, and a rolling assembly 3 is installed in each of the mounting grooves 2a. The rolling assembly 3 includes an insertion column 31, one end of the insertion column 31 is inserted into the mounting groove 2a and is slidably connected to the mounting groove 2a, and a rotatably connected steel ball 32 is embedded in the other end of the insertion column 31, a spring 33 is installed in the mounting groove 2a, and the two ends of the spring 33 are respectively fixedly connected to the inner groove wall of the mounting groove 2a and the insertion end of the insertion column 31.

[0034] It should be noted that: before the inner mold is slowly pulled outward by the winch, the upper inner mold of the inner mold is turned inward and sunk to reduce the volume of the inner mold. At this time, the nuts 51 on both sides of the insertion rod 5 are unscrewed and the insertion rod 5 is removed, and then the upper plate surface of the inner wall of the conversion plate 2 is pushed to deflect outward by 155-160° (as shown in the attached figure). Figure 4 As shown), the insertion rod 5 is passed through: the sleeve joint 43 on the elastic stopper 4 on one side → the two sleeve rings 21 on the conversion plate 2 → the sleeve joint on the elastic stopper 4 on the other side, and then fastened with a nut 51;

[0035] At this time, due to the elastic force of the compression spring 44 in the sleeve 41, the sliding rod 42 is driven to limit the conversion plate 2 to prevent it from deflecting inward, and the conversion plate 2 provided with the rolling assembly 3 is rotated inward to the outside of the template 1, so that when the inner mold is slowly pulled outward by the winch, since the steel ball 32 is tilted outward to the outside of the conversion plate 2, when the inner mold is pulled outward, the steel ball 32 slides outward along the concrete surface, thereby greatly reducing the wear between the inner mold and the concrete surface, and also reducing the damping when the inner mold slides outward along the concrete surface;

[0036] The spring 33 on the insertion column 31 cooperates with the compression spring 44 in the sleeve 41, so as to alleviate the impact force between the inner mold and the concrete surface when the inner mold slides outward.

[0037] The working principle of the inner formwork of the cast-in-place prestressed concrete small box beam provided by the utility model is as follows:

[0038] When pouring concrete on the formwork of the small box beam inner mold, rotate the conversion plate 2 so that the conversion plate 2 seals the rotation cavity 1a, and then pass the insertion rod 5 through the fixing ring 6 and the ring 21 on the inner wall of the conversion plate 2, and tighten it with the nut 51, so as to complete the fixation of the conversion plate 2, so that the concrete small box beam inner mold can be supported and poured; when the inner mold is slowly pulled outward by the winch, the upper inner mold of the inner mold is turned inward and sunk to reduce the volume of the inner mold. At this time, unscrew the nuts 51 on both sides of the insertion rod 5 and remove the insertion rod 5, and then push the upper plate surface of the inner wall of the conversion plate 2 to deflect it outward by 155-160°, and then pass the insertion rod 5 through: one side The sleeve joint 43 on the elastic limit member 4 → the two sleeve rings 21 on the conversion plate 2 → the sleeve joint on the elastic limit member 4 on the other side, and then it is tightened with the nut 51; at this time, due to the elastic force of the compression spring 44 in the sleeve 41, the sliding rod 42 is driven to limit the conversion plate 2 to prevent it from deflecting inward, and the conversion plate 2 with the rolling assembly 3 is rotated to the outside of the template 1, so that when the inner mold is slowly pulled outward by the winch, since the steel ball 32 is tilted outward to the outside of the conversion plate 2, when the inner mold is pulled outward, the steel ball 32 slides outward along the concrete surface, which greatly reduces the wear between the inner mold and the concrete surface, and also reduces the damping when the inner mold slides outward along the concrete surface.

[0039] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cast-in-place prestressed concrete small box girder inner mold, comprising a mold (1), a rotating cavity (1a) is provided on the plate wall of the mold (1), a rotatable conversion plate (2) is installed in the rotating cavity (1a), a rotating shaft (23) is inserted in the middle of the conversion plate (2), and the rotating shaft (23) is installed in the installation holes (1b) provided on the two side walls of the rotating cavity (1a), characterized in that: A plurality of mounting grooves (2a) are provided above the inner wall of the conversion plate (2), a rolling assembly (3) is installed in each of the mounting grooves (2a), the rolling assembly (3) comprises an insertion column (31), one end of the insertion column (31) is inserted into the mounting groove (2a) and is slidably connected to the mounting groove (2a), and a rotatably connected steel ball (32) is embedded in the other end of the insertion column (31), a spring (33) is installed in the mounting groove (2a), and the two ends of the spring (33) are respectively fixedly connected to the inner groove wall of the mounting groove (2a) and the insertion end of the insertion column (31); Two symmetrically distributed collars (21) are fixedly embedded below the inner wall of the conversion plate (2); An elastic limiting member (4) and a fixing ring (6) are installed on the inner plate wall of the template (1) and are distributed up and down.

2. The cast-in-place prestressed concrete small box girder inner form according to claim 1 is characterized in that: Two groups of the elastic limiting members (4) are provided, and the two groups of the elastic limiting members (4) are distributed inside the template (1) and are located above the rotating cavity (1a).

3. The cast-in-place prestressed concrete small box girder inner form according to claim 2 is characterized in that: The elastic limiting member (4) comprises a sleeve (41), one end of the sleeve (41) is rotatably mounted on the inner wall of the template (1) via a rotating frame, a sliding rod (42) is inserted into the sleeve (41), the other end of the sliding rod (42) extends out of the sleeve (41) and is fixedly mounted with a sleeve joint (43), and a compression spring (44) is installed in the sleeve (41).

4. The inner formwork for the cast-in-place prestressed concrete small box beam according to claim 3 is characterized in that: One end of the compression spring (44) is fixedly connected to the inner wall of the sleeve (41), and the other end of the compression spring (44) is fixedly connected to the insertion end of the sliding rod (42).

5. The inner formwork for the cast-in-place prestressed concrete small box beam according to claim 1 is characterized in that: Two fixing rings (6) are provided, and the two fixing rings (6) are fixedly embedded below the inner plate wall of the template (1) and are located on both sides of the rotating cavity (1a).

6. The cast-in-place prestressed concrete small box girder inner form according to claim 1, characterized in that: An insertion rod (5) is inserted between the two collars (21), and threaded sections are provided on both sides of the insertion rod (5), and a threaded nut (51) is sleeved on each threaded section.

7. The cast-in-place prestressed concrete small box girder inner form according to claim 1, characterized in that: The upper and lower end surfaces of the rotating cavity (1a) formed in the template (1) are both provided with downwardly inclined surfaces (11) sloping downward from the inside of the plate to the outside of the plate, and the upper and lower end surfaces of the conversion plate (2) are respectively provided with inclined end surfaces (22) sloping downward from the inside of the plate to the outside of the plate.

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