Construction method of adjustable formwork device for diaphragm of PC precast beam of curved bridge

Abstract

The present invention discloses a construction method for a diaphragm adjustable formwork device for a curved bridge PC precast beam. The method comprises the following steps: Step A, supporting the precast beam main body formwork; Step B, supporting the diaphragm formwork assembly; Step C, adjusting the front and rear side panels; Step D, installing an adjustable bracket; Step E, making bottom steel plates of different angles according to the different intersection angles between the diaphragm and the precast beam body; Step F, placing the bottom steel plate on a movable bracket between the front and rear side panels; Step G, making top plate adjustment blocks of different angles according to the different intersection angles between the diaphragm and the precast beam body; Step H, placing the top plate adjustment blocks on the upper ends of the front and rear side panels and screwing them to the side panel back ribs; Step I, installing the plug plates on the side ribs at the outer ends of the front and rear side panels. The present invention achieves the adjustment of the intersection angle and transverse slope of the side panels and bottom steel plates of the diaphragm formwork assembly, thereby improving construction efficiency, shortening construction period, and enhancing construction quality.

Description

Technical Field

[0001] The invention relates to bridge engineering, in particular to a construction method of a diaphragm adjustable formwork device for a curved bridge PC prefabricated beam. Background Art

[0002] The design and erection of bridges are subject to the overall route of the road. Some bridges will be located in curved sections under the overall linear shape of the route, and curved bridges need to be designed and erected. In order to maintain the cross-sectional shape of the curved bridge and enhance the lateral stiffness, diaphragms are installed between precast beams. Generally speaking, the diaphragms of curved bridges are arranged radially along the curve. The lateral position, transverse slope, and intersection angle with the precast beam body of each span are different. In actual construction, the transverse position of the diaphragm is mostly adjusted by adding or removing beam length adjustment blocks. The transverse slope of the diaphragm template and the intersection angle with the beam body are processed according to the standard beam (straight bridge). The transverse slope and oblique angle cannot be adjusted, resulting in serious dislocation of the diaphragm after the beam plate is erected, which affects both the construction quality of the diaphragm and the stability and safety of the bridge operation.

[0003] Chinese invention application No. 2019106326445 discloses a construction method for adjustable flange plates of prefabricated side beams of curved bridges. This invention application can only be used for flange plates and cannot be used for formwork of diaphragms. Summary of the Invention

[0004] The present invention aims to solve the above technical problems, thereby providing a construction method of a diaphragm adjustable formwork device for a curved bridge PC prefabricated beam, which avoids rework and rectification during the construction process and improves the construction quality.

[0005] The present invention solves the technical problem and adopts the following technical solution:

[0006] A construction method for a diaphragm adjustable formwork device for a curved bridge PC prefabricated beam comprises the following steps:

[0007] Step A: Precast beam main formwork support

[0008] The precast beam main body template includes a bottom template, a front precast beam main body side template, a web plate and a rear precast beam main body side template. The bottom template is installed on the precast pedestal. The front precast beam main body side template, the web plate and the rear precast beam main body side template are connected and then connected to the bottom template.

[0009] Step B: Installing the diaphragm formwork components

[0010] The diaphragm formwork assembly is symmetrically supported on the outer sides of the webs on both sides. The diaphragm formwork assembly includes a bottom steel plate, a front side plate, a rear side plate and a plug plate. An upper adjusting rod and a lower adjusting rod are respectively installed on the upper and lower parts of the outer plate surfaces of the front side plate and the rear side plate. The upper adjusting rod includes an internal threaded sleeve, an adjusting screw and a fixing screw. The inner wall of the internal threaded sleeve is provided with two sections of internal threads with opposite rotation directions. The adjusting screw and the fixing screw are respectively screwed on the two ends of the internal threaded sleeve. The outer end of the adjusting screw is connected to the front side plate or the rear side plate, and the outer end of the fixing screw is connected to the bracket.

[0011] Step C: Adjust the front and rear side panels

[0012] Synchronously tighten the internal threaded sleeves of the upper and lower adjustment rods to adjust the front and rear side panels to the designed angles. The distance between the front and rear side panels should be greater than the width of the bottom steel plate.

[0013] Step D: Install the adjustable bracket

[0014] The adjustable bracket is located at the bottom of the front side panel and the rear side panel. The adjustable bracket includes a fixed bracket, a movable bracket and an adjustment mechanism. The adjustment mechanism includes a universal foot cup, a fisheye bearing and a swing bolt. The base of the universal foot cup is fixedly connected to the movable bracket. The fisheye bearing is mounted on the fixed bracket. The inner ring of the fisheye bearing is provided with an internal thread. The swing bolt is passed through the fisheye bearing and fixedly connected to the support rod of the universal foot cup. The two ends of the fixed bracket are screwed to the front side panel and the rear side panel respectively. The bolts of the fixed bracket and the rear side panel are not tightened yet.

[0015] Step E: manufacturing bottom steel plates of different angles according to different intersection angles between the diaphragm and the prefabricated beam body;

[0016] Step F: Place the bottom steel plate on the movable bracket between the front and rear side panels, screw the bottom steel plate and the movable bracket together, adjust the height of the movable bolts according to the designed transverse slope of the diaphragm, and make the transverse slope of the top surface of the bottom steel plate meet the design requirements. Then adjust the angles of the front and rear side panels to the desired position, and tighten the bolts fixing the bracket and the rear side panel.

[0017] Step G, making top plate adjustment blocks of different angles according to different intersection angles between the diaphragm and the prefabricated beam body;

[0018] Step H: The top plate adjustment blocks are respectively placed on the upper ends of the front side plate and the rear side plate and screwed to the back ribs of the side plates;

[0019] Step I: Install the plugging plates on the side ribs at the outer ends of the front and rear side panels.

[0020] Compared with the prior art, the present invention adopting the above technical solution has the following beneficial effects:

[0021] The angle and transverse slope of the side plate and bottom steel plate of the diaphragm formwork assembly can be adjusted with simple operation, which avoids repair and rectification during the construction process, improves construction efficiency, shortens construction period, improves construction quality, ensures the lateral stiffness of the bridge, enhances the lateral stability and safety of the bridge during operation, and reduces the occurrence of bridge diaphragm diseases.

[0022] Furthermore, the optimization scheme of the present invention is:

[0023] A slurry-stopping plate is provided between the plug plate and the two side plates.

[0024] The bolt holes of the plug plate are long holes.

[0025] The bolt hole at one end of the rear side plate of the fixing bracket is a long hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is an axonometric diagram of an embodiment of the present invention;

[0027] Figure 2 A front view of an embodiment of the present invention;

[0028] Figure 3 for Figure 1 A three-dimensional diagram of the AA section;

[0029] Figure 4 for Figure 2 A three-dimensional diagram of the BB section;

[0030] Figure 5 It is a front view of the adjustment rod according to an embodiment of the present invention.

[0031] In the figure: prefabricated pedestal 1; bottom template 1-1; bracket 1-2; upper cross bar 1-3; lower cross bar 1-4; front prefabricated beam main body side template 2; rear prefabricated beam main body side template 3; web 4; front side plate 5; rear side plate 6; upper adjustment rod 7; lower adjustment rod 8; adjustable bracket 9; upper cross beam 9-1; lower cross beam 9-2; universal foot cup 9-3; fisheye bearing 9-4; movable bolt 9-5; bottom steel plate 10; top plate adjustment block 11; side plate back rib 12; plug plate 13; stop plate 14. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings and examples.

[0033] See also Figures 1-4 This embodiment is a construction method of a diaphragm adjustable formwork device for a curved bridge PC precast beam, which is carried out in the following steps:

[0034] Step A: Precast beam main formwork support

[0035] The precast beam main body template includes a bottom template 1-1, a front precast beam main body side template 2, a rear precast beam main body side template 3 and a web 4. The bottom template 1-1 is installed on the precast pedestal 1, and the web 4 is installed on the front precast beam main body side template 2 and the precast beam main body side template 3. Then, the front precast beam main body side template 2, the rear precast beam main body side template 3 and the web 4 are connected to the bottom template 1-1.

[0036] Step B: Installing the diaphragm formwork components

[0037] The diaphragm formwork assembly is symmetrically supported on the outer sides of the webs 4 on both sides. The diaphragm formwork assembly includes a front side plate 5, a rear side plate 6, a bottom steel plate 10 and a plug plate 13. Two upper adjustment rods 7 and two lower adjustment rods 8 are respectively installed on the upper and lower parts of the outer plate surfaces of the front side plate 5 and the rear side plate 6. The upper adjustment rods 7 and the lower adjustment rods 8 have the same structure. The upper adjustment rod 7 is mainly composed of an internal threaded sleeve 7-1, an adjustment screw 7-2 and a fixed screw 7-3. The inner wall of the internal threaded sleeve 7-2 is provided with two sections of internal threads with opposite rotation directions. The adjustment screw 7-1 and the fixed screw 7-3 are respectively screwed on the two ends of the internal threaded sleeve 7-1. The outer end of the adjustment screw 7-2 is connected to the front side plate 5 or the rear side plate 6. The outer end of the fixed screw 7-3 is connected to the upper crossbar 1-3 of the bracket 1-2. The outer end of the fixed screw 7-3 of the lower adjustment rod 8 is connected to the lower crossbar 1-4 of the bracket 1-2.

[0038] Step C: Adjust the front and rear side panels

[0039] Synchronously screw the internal threaded sleeve 7-1 of the upper adjusting rod 7 and the lower adjusting rod 8 to adjust the front side plate 5 and the rear side plate 6 to the designed angle. The upper adjusting rod 7 and the lower adjusting rod 8 must be adjusted synchronously to avoid deformation of the front side plate 5 and the rear side plate 6 due to asynchrony. The spacing between the front side plate 5 and the rear side plate 6 should not be adjusted into place at one time. The distance between the front side plate 5 and the rear side plate 6 is 1 to 2 cm larger than the width of the bottom steel plate 10 so that there is a certain adjustment space when installing the bottom steel plate 10.

[0040] Step D: Install the adjustable bracket

[0041] The adjustable bracket 9 is located at the bottom of the front side plate 5 and the rear side plate 6. The adjustable bracket 9 is mainly composed of a fixed bracket, a movable bracket and an adjustment mechanism. The fixed bracket is composed of three lower cross beams 9-2, and the movable bracket is composed of three upper cross beams 9-1. The upper cross beams 9-1 are placed above the lower cross beams 9-2 and correspond one to one with the lower cross beams 9-2. The two ends of the lower cross beams 9-2 are installed on the side ribs at the bottom of the front side plate 5 and the rear side plate 6 by bolts. The bolt hole at one end of the rear side plate 6 of the lower cross beam 9-2 is a long hole, and the bottom steel plate 10 is connected to the upper cross beam 9-1 by bolts.

[0042] The adjustment mechanism primarily consists of a universal foot cup 9-3, a fisheye bearing 9-4, and a swing bolt 9-5. The base of universal foot cup 9-3 is mounted in the center of the bottom surface of upper beam 9-2. Fisheye bearing 9-4 is mounted in a pre-recorded mounting hole in lower beam 9-1. The inner ring of fisheye bearing 9-4 is internally threaded. Swing bolt 9-5 penetrates within fisheye bearing 9-4 and engages with the inner threads of the inner ring. The upper end of swing bolt 9-5 is fixedly connected to the support rod of universal foot cup 9-3. The support rod and base of universal foot cup 9-3 are connected by a ball joint, and the inner and outer rings of fisheye bearing 9-4 are connected by a ball joint. The adjustment mechanism adjusts the height, slope, and multiple angles of upper beam 9-2. The two ends of the lower crossbeam 9-2 of the fixed bracket are screwed to the side ribs at the bottom of the front side plate 5 and the rear side plate 6 respectively. The bolt hole at one end of the rear side plate 6 of the lower crossbeam 9-2 is a long hole. The bolts between the lower crossbeam 9-2 and the rear side plate 6 are not tightened yet;

[0043] Step E: manufacturing bottom steel plates 10 with different angles according to different intersection angles between the diaphragm and the prefabricated beam body;

[0044] Step F: Place the bottom steel plate 10 on the upper crossbeam 9-1 of the movable bracket between the front side plate 5 and the rear side plate 6, screw the bottom steel plate 10 to the upper crossbeam 9-1, adjust the height of the movable bolts 9-5 according to the designed cross slope of the diaphragm, so that the cross slope of the top surface of the bottom steel plate 10 meets the design requirements, then adjust the angles of the front side plate 5 and the rear side plate 6 to the correct position, and tighten the bolts of the lower crossbeam 9-2 of the fixed bracket and the rear side plate 6;

[0045] Step G: manufacturing top plate adjustment blocks 11 with different angles according to different intersection angles between the diaphragm and the prefabricated beam body. The top plate adjustment blocks 11 are L-shaped.

[0046] Step H: Install the two top plate adjustment blocks 11 to the upper ends of the front side plate 5 and the rear side plate 6, respectively. The horizontal portions of the top plate adjustment blocks 11 are connected to the side plate back ribs 12 by bolts, and the vertical portions of the top plate adjustment blocks 11 are located at the outer ends of the front side plate 5 and the rear side plate 6.

[0047] Step I: The plugging plate 13 is installed on the side ribs at the outer ends of the front side plate 5 and the rear side plate 6. The bolt holes of the plugging plate 13 are long holes. The slurry stopping plates 14 are respectively installed between the plugging plate 13 and the two side plates. The slurry stopping plates 14 block the leakage of slurry from the long bolt holes and increase the force-bearing area.

[0048] The present invention realizes the adjustment of the intersection angle and the transverse slope of the diaphragm template by adjusting the structure and the adjusting rod. It has an ingenious structure and is easy to operate. It avoids rework and rectification during the construction process, improves the construction quality, ensures the lateral stiffness of the bridge, enhances the lateral stability and safety of the bridge during operation, and reduces the occurrence of bridge diaphragm diseases.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made using the contents of the present invention specification and its drawings are included in the scope of the present invention.

Claims

1. A construction method for a diaphragm adjustable formwork device for a curved bridge PC precast beam, comprising the following steps: Step A: Precast beam main formwork support The precast beam main body template includes a bottom template, a front precast beam main body side template, a web plate and a rear precast beam main body side template. The bottom template is installed on the precast pedestal. The front precast beam main body side template, the web plate and the rear precast beam main body side template are connected and then connected to the bottom template. Step B: Installing the diaphragm formwork components The diaphragm formwork assembly is symmetrically supported on the outer sides of the webs on both sides. The diaphragm formwork assembly includes a bottom steel plate, a front side plate, a rear side plate and a plug plate. An upper adjusting rod and a lower adjusting rod are respectively installed on the upper and lower parts of the outer plate surfaces of the front side plate and the rear side plate. The upper adjusting rod includes an internal threaded sleeve, an adjusting screw and a fixing screw. The inner wall of the internal threaded sleeve is provided with two sections of internal threads with opposite rotation directions. The adjusting screw and the fixing screw are respectively screwed on the two ends of the internal threaded sleeve. The outer end of the adjusting screw is connected to the front side plate or the rear side plate, and the outer end of the fixing screw is connected to the bracket. Step C: Adjust the front and rear side panels Synchronously tighten the internal threaded sleeves of the upper and lower adjustment rods to adjust the front and rear side panels to the designed angles. The distance between the front and rear side panels should be greater than the width of the bottom steel plate. Step D: Install the adjustable bracket The adjustable bracket is located at the bottom of the front side panel and the rear side panel. The adjustable bracket includes a fixed bracket, a movable bracket and an adjustment mechanism. The adjustment mechanism includes a universal foot cup, a fisheye bearing and a swing bolt. The base of the universal foot cup is fixedly connected to the movable bracket. The fisheye bearing is mounted on the fixed bracket. The inner ring of the fisheye bearing is provided with an internal thread. The swing bolt is passed through the fisheye bearing and fixedly connected to the support rod of the universal foot cup. The two ends of the fixed bracket are screwed to the front side panel and the rear side panel respectively. The bolts of the fixed bracket and the rear side panel are not tightened yet. Step E: manufacturing bottom steel plates of different angles according to different intersection angles between the diaphragm and the prefabricated beam body; Step F: Place the bottom steel plate on the movable bracket between the front and rear side panels, screw the bottom steel plate and the movable bracket together, adjust the height of the movable bolts according to the designed transverse slope of the diaphragm, and make the transverse slope of the top surface of the bottom steel plate meet the design requirements. Then adjust the angles of the front and rear side panels to the desired position, and tighten the bolts fixing the bracket and the rear side panel. Step G, making top plate adjustment blocks of different angles according to different intersection angles between the diaphragm and the prefabricated beam body; Step H: The top plate adjustment blocks are respectively placed on the upper ends of the front side plate and the rear side plate and screwed to the back ribs of the side plates; Step I: Install the plugging plates on the side ribs at the outer ends of the front and rear side panels.

2. The construction method of the diaphragm adjustable formwork device for curved bridge PC precast beams according to claim 1 is characterized by: A slurry-stopping plate is provided between the plug plate and the two side plates.

3. The construction method of the diaphragm adjustable formwork device for curved bridge PC precast beams according to claim 1 is characterized by: The bolt holes of the plug plate are long holes.

4. The construction method of the diaphragm adjustable formwork device for curved bridge PC precast beams according to claim 1 is characterized by: The bolt hole at one end of the rear side plate of the fixing bracket is a long hole.

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