A mobile pedestal for producing prefabricated box girders for highways

Abstract

The present invention relates to a mobile pedestal for producing prefabricated box girders for highways, comprising a base, a first bottom mold platform, a second bottom mold platform, and a third bottom mold platform. The first bottom mold platform is fixedly connected to the base via a support beam and includes a bottom mold surface A. The second and third bottom mold platforms form an L-shaped structure and are disposed on one side of the first bottom mold platform. The second bottom mold platform includes a bottom mold surface B and a limiting surface B, and the third bottom mold platform includes a bottom mold surface C and a limiting surface C, with bottom mold surfaces B and C being perpendicular to each other. Several support frames are fixedly disposed between the second and third bottom mold platforms, the support frames being rotatably connected to the supports via support shafts, the supports being fixedly connected to a slide, and the slide being linearly slidably connected to the base. The mobile pedestal also includes a push-pull mechanism for moving the slide away from and into contact with the first bottom mold platform. The supports include vertical limiting surfaces A and B that are parallel to each other and disposed opposite each other. This technical solution can switch between two bottom mold surfaces of different widths, achieving high switching efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of prefabricated box girders, and in particular relates to a mobile pedestal for producing prefabricated box girders for highways. Background Art

[0002] In highway and bridge construction, precast box girders come in lengths of 20 meters, 25 meters, 30 meters, 35 meters, 40 meters, and 45 meters. Their widths are typically designed based on the span and load-bearing capacity. Common widths for precast box girders in highway and bridge construction are 2.4 meters and 2 meters. The 2.4-meter-wide box girder is suitable for a variety of highway bridges, while the 2-meter-wide box girder is suitable for medium-span highway bridges.

[0003] Current mobile pedestals are generally only suitable for prefabricated box girders of one width. When a bridge needs to be prefabricated for a different width, there are generally two approaches: one is to purchase new pedestals based on actual needs; the other is to modify the existing pedestals. The former method is not only costly but also incurs significant management costs as the existing pedestals remain idle. The latter method is not only labor-intensive but also risks making it impossible to restore the pedestals to their original width.

[0004] Patent publication number CN110788984A discloses a precast beam pedestal width-adjusting device and its implementation method. This device directly covers the top of the existing platform with a wider steel plate, which serves as the lower formwork for the precast beams. Large steel plates are prone to deformation during installation and storage. When this deformed plate is used as the new lower formwork over the top of the existing platform, it is difficult to maintain a flat surface due to the deformation. Furthermore, this wider steel plate incurs management costs when not in use.

[0005] Chinese utility model patent publication number CN218948028U discloses a device for widening various beam-making pedestals. This device welds angle steel to the sides of the original pedestal, supporting several jacks at the bottom of the angle steel. The increased top width of the angle steel increases the overall width of the pedestal. Firstly, the welding itself prevents the pedestal from returning to its original width. Secondly, extensive leveling work is required before welding the angle steel, and the welding itself is also very labor-intensive. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to make up for the deficiencies of the prior art and provide a movable pedestal for producing prefabricated box girders for highways, so as to facilitate switching between two widths of different specifications according to actual needs.

[0007] To solve the above technical problems, the technical solution of the present invention is:

[0008] A mobile pedestal for producing prefabricated box girders for highways, comprising a base, a first bottom mold platform, a second bottom mold platform and a third bottom mold platform;

[0009] The first bottom mold platform includes a bottom mold surface A, and the first bottom mold platform is fixedly connected to the base through a support beam below; the second bottom mold platform and the third bottom mold platform form an L-shaped structure and are arranged on one side of the first bottom mold platform;

[0010] The second bottom mold platform includes a bottom mold surface B and a limit surface B that are parallel to each other and disposed opposite to each other. The third bottom mold platform includes a bottom mold surface C and a limit surface C that are parallel to each other and disposed opposite to each other. The bottom mold surface B and the bottom mold surface C are perpendicular to each other. A plurality of support frames are fixedly arranged between the second bottom mold platform and the third bottom mold platform. The support frames are rotatably connected to the supports via support shafts. The supports are fixedly connected to the slide. The slide is linearly slidably connected to the base. A push-pull mechanism is also included for moving the slide away from and close to the first bottom mold platform.

[0011] The support includes a vertical limit surface A and a vertical limit surface B which are parallel to each other and arranged back to back. When the second bottom mold platform is rotated to a vertical state, the limit surface B abuts the vertical limit surface B, then the third bottom mold platform is horizontal, and the bottom mold surface C and the bottom mold surface A are located in the same horizontal plane; when the third bottom mold platform is rotated to a vertical state, the limit surface C abuts the vertical limit surface A, then the second bottom mold platform is horizontal, and the bottom mold surface B and the bottom mold surface A are located in the same horizontal plane.

[0012] Furthermore, the push-pull mechanism is a telescopic cylinder, which includes a cylinder body and a telescopic rod. A hinge ear B is fixedly provided on the end of the cylinder body facing away from the telescopic rod. The hinge ear B is rotatably connected to the hinge ear C through a pin, and the hinge ear C is fixedly connected to the support beam; the overhanging end of the telescopic rod is rotatably connected to the hinge ear A through a pin, and the hinge ear A is fixedly connected to the support.

[0013] Furthermore, the telescopic cylinder is a hydraulic cylinder or an electric cylinder.

[0014] Furthermore, the linear sliding connection between the slide and the base is as follows: a slider is fixedly provided at the bottom of the slide, the slider is matched with the linear guide rail for sliding connection, and the linear guide rail is fixedly connected to the base.

[0015] Furthermore, a U-shaped channel steel is fixed on the side of the first bottom mold platform facing the second bottom mold platform and the third bottom mold platform, and a slurry-stopping rubber strip is clamped in the U-shaped channel steel. The slurry-stopping rubber strip is used to seal and abut against the second bottom mold platform and the third bottom mold platform.

[0016] Furthermore, a plurality of through holes T are provided on the sealing plates at the front and rear ends of the support beam for screw rods to pass through, and the two adjacent front and rear movable pedestals are fixedly connected by the screw rods and nuts.

[0017] Furthermore, the width of the bottom mold surface A of the first bottom mold platform is W1, the width of the bottom mold surface B of the second bottom mold platform is W2, the width of the bottom mold surface C of the third bottom mold platform is W3, and W1>W3>W2.

[0018] Furthermore, W1=1.4m, W2=0.6m, W3=1m.

[0019] Furthermore, the plates to which the bottom mold surface A, bottom mold surface B and bottom mold surface C belong are all stainless steel composite plates, and the bottom mold surface A, bottom mold surface B and bottom mold surface C are all stainless steel clad outer surfaces.

[0020] Furthermore, the method of use is:

[0021] When the bottom mold surface A and the bottom mold surface C need to be combined to form the first width, the slide is moved away from the first bottom mold platform by the push-pull mechanism; the L-shaped structure formed by the second bottom mold platform and the third bottom mold platform is rotated to make the third bottom mold platform horizontal; the slide is moved closer to the first bottom mold platform by the push-pull mechanism until the bottom mold surface C is in close contact with the bottom mold surface A;

[0022] When the bottom mold surface A and the bottom mold surface B need to be combined to form the second width, the slide is moved away from the first bottom mold platform through the push-pull mechanism; the L-shaped structure formed by the second bottom mold platform and the third bottom mold platform is rotated to make the second bottom mold platform horizontal; the slide is moved close to the first bottom mold platform through the push-pull mechanism until the bottom mold surface B is close to the bottom mold surface A.

[0023] The beneficial effects that can be achieved by the present invention are: in this technical solution, the bottom mold plate A can be easily switched with the bottom mold surface B or the bottom mold surface C according to actual needs to form two bottom mold surfaces of different widths. The switching process does not require leveling, welding, disassembly and assembly, and the switching efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a main view of state 1 of an embodiment of the present invention.

[0025] Figure 2 This is a main view of state 2 of embodiment of the present invention.

[0026] Figure 3 This is the main view of the switching process status of the embodiment of the present invention.

[0027] Figure 4 yes Figure 1 Magnified view of section A.

[0028] Figure 5 It is a three-dimensional diagram (angle 1) of state 1 of embodiment of the present invention.

[0029] Figure 6 It is a three-dimensional diagram of state 1 of embodiment of the present invention (angle 2).

[0030] Figure 7 It is a three-dimensional diagram of state one of embodiment of the present invention (angle three).

[0031] Figure 8 It is a three-dimensional diagram of the second state of the embodiment of the present invention.

[0032] In the figure: 1-base, 2-support beam, 201-through hole T, 3-first bottom mold platform, 301-bottom mold surface A, 302-U-shaped channel steel, 303-slurry-stopping rubber strip, 4-second bottom mold platform, 401-bottom mold surface B, 402-limiting surface B, 5-third bottom mold platform, 501-bottom mold surface C, 502-limiting surface C, 6-support frame, 7-support shaft, 8-support, 801-vertical limiting surface A, 802-vertical limiting surface B, 9-slide, 10-linear guide rail, 11-slider, 12-hinge ear A, 13-telescopic cylinder, 14-hinge ear B, 15-hinge ear C. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1-Figure 3 As shown, a mobile pedestal for producing prefabricated box girders for highways includes a base 1, a first bottom mold platform 3, a second bottom mold platform 4 and a third bottom mold platform 5.

[0035] The first bottom mold platform 3 includes a bottom mold surface A301 with a width W1 of 1.4 m. A support beam 2 is welded below the first bottom mold platform 3 , and the bottom of the support beam 2 is welded to the base 1 .

[0036] The second bottom mold platform 4 and the third bottom mold platform 5 are welded to form an L-shaped structure and are arranged on one side of the first bottom mold platform 3 .

[0037] The second bottom mold platform 4 includes a bottom mold surface B401 and a limiting surface B402, which are parallel and opposite to each other. The width of bottom mold surface B401 is W2, which is 0.6 meters. The third bottom mold platform 5 includes a bottom mold surface C501 and a limiting surface C502, which are parallel and opposite to each other. The width of bottom mold surface C501 is W3, which is 1 meter. Bottom mold surfaces B401 and C501 are perpendicular to each other.

[0038] Several support frames 6 are welded between the second bottom mold platform 4 and the third bottom mold platform 5. Figure 7 As shown, the support frame 6 is rotatably connected to the support 8 through the support shaft 7, the support 8 is fixedly connected to the slide 9, and the slide 9 is linearly slidably connected to the base 1. The sliding connection method is: a slider 11 is fixedly provided at the bottom of the slide 9, the slider 11 is matched with the linear guide rail 10 for sliding connection, and the linear guide rail 10 is fixedly connected to the base 1.

[0039] The push-pull mechanism is also included, which is used to move the slide 9 away from and into contact with the first bottom mold platform 3. The push-pull mechanism in this embodiment is a hydraulic telescopic cylinder 13, comprising a cylinder body and a telescopic rod. A hinge lug B14 is fixed to the end of the cylinder body facing away from the telescopic rod. Hinge lug B14 is rotatably connected to hinge lug C15 via a pin, and hinge lug C15 is fixedly connected to the support beam 2. The overhanging end of the telescopic rod is rotatably connected to hinge lug A12 via a pin, and hinge lug A12 is fixedly connected to the support 8.

[0040] The support 8 includes a vertical limit surface A801 ​​and a vertical limit surface B802 which are parallel to each other and arranged back to back. When the second bottom mold platform 4 is rotated to a vertical state, the limit surface B402 abuts the vertical limit surface B802, then the third bottom mold platform 5 is horizontal, and the bottom mold surface C501 and the bottom mold surface A301 are located in the same horizontal plane; when the third bottom mold platform 5 is rotated to a vertical state, the limit surface C502 abuts the vertical limit surface A801, then the second bottom mold platform 4 is horizontal, and the bottom mold surface B401 and the bottom mold surface A301 are located in the same horizontal plane.

[0041] A U-shaped channel steel 302 is fixed on one side of the first bottom mold platform 3 facing the second bottom mold platform 4 and the third bottom mold platform 5. A slurry-stopping rubber strip 303 is clamped in the U-shaped channel steel 302. The slurry-stopping rubber strip 303 is used to seal and abut against the second bottom mold platform 4 and the third bottom mold platform 5. Figure 4 shown.

[0042] The movable pedestals are generally segmented according to the total length of the box beam. In order to connect the two adjacent movable pedestals in front and behind, a number of through holes T201 are provided on the cover plates at the front and rear ends of the support beam 2. The screws pass through the corresponding through holes T201 on the front and rear movable pedestals and the back nuts to fix the two movable pedestals in connection.

[0043] The sheet materials for bottom mold surfaces A301, B401, and C501 are all stainless steel composite plates, which are composite steel plates composed of a carbon steel base layer and a stainless steel cladding layer. Bottom mold surfaces A301, B401, and C501 are all stainless steel cladding surfaces. Mold surfaces generally require excellent flatness and smoothness, and stainless steel is a material that best meets these requirements. However, stainless steel is very expensive. The use of stainless steel composite plates in this embodiment ensures the flatness and smoothness of bottom mold surfaces A301, B401, and C501 while also reducing costs.

[0044] How to use:

[0045] When the bottom mold surface A301 and the bottom mold surface C501 are combined to form a width of 2.4 meters, the slide 9 is moved away from the first bottom mold platform 3 by the push-pull mechanism; the L-shaped structure formed by the second bottom mold platform 4 and the third bottom mold platform 5 is rotated (such as Figure 3By pushing and pulling the slide 9 close to the first bottom mold platform 3, until the bottom mold surface C501 is close to the bottom mold surface A301, as shown Figure 1 、 Figure 5-Figure 7 shown.

[0046] When the bottom mold surface A301 and the bottom mold surface B401 are combined to form a width of 2 meters, the slide 9 is moved away from the first bottom mold platform 3 by the push-pull mechanism; the L-shaped structure formed by the second bottom mold platform 4 and the third bottom mold platform 5 is rotated (such as Figure 3 By pushing and pulling the slide 9 close to the first bottom mold platform 3, until the bottom mold surface B401 is close to the bottom mold surface A301, as shown Figure 2 shown.

[0047] In this embodiment, corresponding slurry-stopping rubber strips are installed on the corresponding side molds.

[0048] The above is only one embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiment. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications made without departing from the concept of the present invention are all within the protection scope of the present invention.

Claims

1. A mobile pedestal for producing prefabricated box girders for highways, characterized by: It comprises a base (1), a first bottom mold platform (3), a second bottom mold platform (4) and a third bottom mold platform (5); The first bottom mold platform (3) includes a bottom mold surface A (301), and the first bottom mold platform (3) is fixedly connected to the base (1) via a support beam (2) below; the second bottom mold platform (4) and the third bottom mold platform (5) form an L-shaped structure and are arranged on one side of the first bottom mold platform (3); The second bottom mold platform (4) includes a bottom mold surface B (401) and a limit surface B (402) that are parallel to each other and arranged opposite to each other, and the third bottom mold platform (5) includes a bottom mold surface C (501) and a limit surface C (502) that are parallel to each other and arranged opposite to each other, and the bottom mold surface B (401) and the bottom mold surface C (501) are perpendicular to each other; a plurality of support frames (6) are fixedly provided between the second bottom mold platform (4) and the third bottom mold platform (5), the support frames (6) are rotatably connected to the support (8) through the support shaft (7), the support (8) is fixedly connected to the slide (9), and the slide (9) is linearly slidably connected to the base (1); and a push-pull mechanism is also included for moving the slide (9) away from and close to the first bottom mold platform (3); The support (8) includes a vertical limiting surface A (801) and a vertical limiting surface B (802) that are parallel to each other and arranged opposite to each other. When the second bottom mold platform (4) is rotated to a vertical state, the limiting surface B (402) abuts against the vertical limiting surface B (802), and the third bottom mold platform (5) is horizontal, and the bottom mold surface C (501) and the bottom mold surface A (301) are located in the same horizontal plane; when the third bottom mold platform (5) is rotated to a vertical state, the limiting surface C (502) abuts against the vertical limiting surface A (801), and the second bottom mold platform (4) is horizontal, and the bottom mold surface B (401) and the bottom mold surface A (301) are located in the same horizontal plane.

2. The mobile pedestal for producing prefabricated box girders for highways according to claim 1 is characterized by: The push-pull mechanism is a telescopic cylinder (13), which includes a cylinder body and a telescopic rod. A hinge ear B (14) is fixedly provided on one end of the cylinder body facing away from the telescopic rod. The hinge ear B (14) is rotatably connected to a hinge ear C (15) via a pin. The hinge ear C (15) is fixedly connected to the support beam (2). The overhanging end of the telescopic rod is rotatably connected to a hinge ear A (12) via a pin. The hinge ear A (12) is fixedly connected to the support (8).

3. The mobile pedestal for producing prefabricated box girders for highways according to claim 2 is characterized by: The telescopic cylinder (13) is a hydraulic cylinder or an electric cylinder.

4. The mobile pedestal for producing prefabricated box girders for highways according to claim 1 is characterized by: The linear sliding connection between the slide (9) and the base (1) is as follows: a slider (11) is fixedly provided at the bottom of the slide (9), the slider (11) is matched with the linear guide rail (10) for sliding connection, and the linear guide rail (10) is fixedly connected to the base (1).

5. The mobile pedestal for producing prefabricated box girders for highways according to claim 1 is characterized by: A U-shaped channel steel (302) is fixedly provided on one side of the first bottom mold platform (3) facing the second bottom mold platform (4) and the third bottom mold platform (5), and a slurry-stopping rubber strip (303) is clamped in the U-shaped channel steel (302). The slurry-stopping rubber strip (303) is used for sealingly contacting the second bottom mold platform (4) and the third bottom mold platform (5).

6. The mobile pedestal for producing prefabricated box girders for highways according to claim 1 is characterized by: The front and rear end sealing plates of the support beam (2) are both provided with a plurality of through holes T (201) for screws to pass through, and the two adjacent front and rear movable pedestals are fixedly connected by the screws and nuts.

7. The mobile pedestal for producing prefabricated box girders for highways according to claim 1 is characterized by: The bottom mold surface A (301) of the first bottom mold platform (3) has a width of W1, the bottom mold surface B (401) of the second bottom mold platform (4) has a width of W2, and the bottom mold surface C (501) of the third bottom mold platform (5) has a width of W3, and W1>W3>W2.

8. The mobile pedestal for producing prefabricated box girders for highways according to claim 7 is characterized by: W1=1.4m, W2=0.6m, W3=1m.

9. The mobile pedestal for producing prefabricated box girders for highways according to claim 1 is characterized by: The plates to which the bottom mold surface A (301), the bottom mold surface B (401) and the bottom mold surface C (501) belong are all stainless steel composite plates, and the bottom mold surface A (301), the bottom mold surface B (401) and the bottom mold surface C (501) are all stainless steel clad outer surfaces.

10. The mobile pedestal for producing prefabricated box girders for highways according to claim 1, characterized in that: How to use: When the bottom mold surface A (301) and the bottom mold surface C (501) need to be combined to form the first width, the slide (9) is moved away from the first bottom mold platform (3) by the push-pull mechanism; the L-shaped structure formed by the second bottom mold platform (4) and the third bottom mold platform (5) is rotated to make the third bottom mold platform (5) horizontal; the slide (9) is moved close to the first bottom mold platform (3) by the push-pull mechanism until the bottom mold surface C (501) is in close contact with the bottom mold surface A (301); When the bottom mold surface A (301) and the bottom mold surface B (401) need to be combined to form a second width, the slide (9) is moved away from the first bottom mold platform (3) by the push-pull mechanism; the L-shaped structure formed by the second bottom mold platform (4) and the third bottom mold platform (5) is rotated so that the second bottom mold platform (4) is in a horizontal state; and the slide (9) is moved close to the first bottom mold platform (3) by the push-pull mechanism until the bottom mold surface B (401) is in close contact with the bottom mold surface A (301).

Images