Installation construction method for preventing falling of prestressed cables of simply supported beam bridges with high piers

Abstract

The present invention belongs to the technical field of bridge construction, and particularly relates to an installation construction method for preventing the falling of prestressed cables of simply supported beam bridges with high piers. The present invention includes seven steps: construction preparation, placing the connecting cables for preventing the falling of the beam, fixing the steel cushion bottom plate, installing the fixing part of the beam for preventing the falling, installing the moving part of the beam for preventing the falling and adjusting the moving amount, anti-corrosion treatment, and installing the protective cover. During the period when the entire span of the beam body is installed in place and the main reinforcement of the cross diaphragm is welded, but the wet joint of the beam slab has not been constructed yet, a working platform for the process is utilized by means of a steel bar cage, the gap between two cross diaphragms, and the top of the pier cap. Compared with a lift truck, the working platform is more stable. Since it is not affected by strong winds, the installation quality and safety are guaranteed, and it is also faster, effectively shortening the construction period, reducing the equipment rental, auxiliary tools, and the number of auxiliary personnel. At the same time, the secondary handling cost is reduced, and the construction cost is saved. The present invention has no mechanical exhaust gas emissions and oil leakage, and there is no need to build a working platform, having basically no impact on the surrounding ecological environment.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to an installation and construction method for a prestressed cable anti-falling beam of a high-pier simply supported beam bridge. Background Art

[0002] In infrastructure construction, bridges, as key transportation infrastructure, play an irreplaceable role in national economic development and people's daily lives. However, damage to bridges during major natural disasters such as earthquakes and debris flows inevitably paralyzes transportation networks, creating significant challenges for disaster relief and reconstruction efforts. In addition to bearing damage, substructure damage, and foundation damage, bridge earthquake damage also commonly causes beam and slab collapse (beam drop).

[0003] During the construction of a large bridge on a certain highway project, prestressed cable-type secondary anti-fall beam devices were installed longitudinally between the abutments and slabs, and between the slabs themselves. Due to the frequent strong winds in the construction area, the installation of the anti-fall beams required high-altitude work, intersecting with the bridge deck construction. Furthermore, the designed anti-fall beam devices were not guided by current technical specifications for construction. Currently, the anti-fall beams used are mostly support-type and zipper-type, which differ from prestressed cable-type anti-fall beams in terms of structure, load-bearing locations, and installation methods. The traditional construction method involves using a lift truck or other telescopic boom machine to lift and install the beams from below after the slabs are erected. However, due to the high bridge deck, poor construction environment, high safety risks, and the lack of a lift truck platform under the bridge, this not only increases construction costs and slows down the construction process, but also wastes manpower and poses safety risks. Summary of the Invention

[0004] The present invention provides an installation and construction method for a prestressed cable-stayed anti-falling beam of a high-pier simply supported beam bridge, aiming to provide an installation and construction method for an anti-falling beam that is low in cost, fast in construction speed, safe and reliable, saves human resources, and is less affected by the environmental environment.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for installing and constructing a prestressed cable anti-falling beam of a high-pier simply supported beam bridge comprises the following steps:

[0007] Step 1: Construction preparation;

[0008] Step 2: Install the connecting cables of the anti-fall beam

[0009] When the whole span beam is installed in place, the main reinforcement of the diaphragm is welded, and the beam-slab wet joint has not yet been constructed, the connecting cables are placed;

[0010] Step 3: Fix the steel pad bottom plate;

[0011] Step 4: Install the anti-falling beam fixing part;

[0012] Step 5: Install the anti-falling beam moving part and adjust the moving amount;

[0013] Step 6: Anti-corrosion treatment;

[0014] Step 7: Install the protective cover.

[0015] The construction preparation in Step 1 is completed before the anti-falling beam is manufactured; the following operations are carried out for the construction preparation:

[0016] S1: Check and calibrate the elevation, size, and coordinates of the bearing pad stone on the top of the cap beam. If there are any deviations, handle them in a timely manner;

[0017] S2: Measure and check the geometric dimensions of the beam body, the positions of the reserved holes, and the camber according to the nameplate of the precast beam slab, and obtain the data of the inner diameter of the reserved holes and the net distance at the connecting end after the beam is erected.

[0018] The specific method for placing the connecting cable of the anti-falling beam in Step 2 is as follows:

[0019] S1: Loosen the set screws at both ends of the connecting cable on the anti-falling beam and screw out the nuts at both ends;

[0020] S2: When the installation position of the connecting cable is at the top of the cap beam, the operator stands on the top of the cap beam. Otherwise, lower the steel bar cage into the gap between two adjacent cross diaphragms and fix it, and then the operator enters the steel bar cage;

[0021] S3: Place the connecting cable to the installation position, adjust the angle of the connecting cable, and pass one end of it through the reserved hole on the beam body. Then, guide the connecting cable between the two holes to prevent the cable from being scratched; subsequently, pass the connecting cable through the reserved hole on the other end of the beam body.

[0022] The steel bar cage includes a lifting hook, steel bar columns, open hooks, bottom pads, and connecting bars; the bottom pad is a square plate, and a steel bar column is vertically connected to each of its four corners; a lifting hook is fixedly connected to the top of each steel bar column, and multiple connecting bars are horizontally connected between adjacent steel bar columns; an open hook is connected to the connection between at least one steel bar column and the connecting bar on one side.

[0023] The specific method for fixing the steel pad bottom plate in Step 3 is as follows:

[0024] S1: Locate the centering dimension of the steel pad bottom plate on the anchoring surface of the anti-falling beam and the cross diaphragm on the opposite beam body;

[0025] S2: Pass the steel pad bottom plates at both ends through the connecting cables respectively, and make the steel pad bottom plates at both ends centered and perpendicular to the reserved hole duct of the beam slab;

[0026] S3: Pre-tighten the steel pad base plate, then adjust the steel pad base plate so that the connecting cable can be adjusted and moved within the holes of the steel pad base plate, and then fasten the steel pad base plate in a diagonal order.

[0027] The specific method for installing the anti-falling beam fixing part in the fourth step is as follows:

[0028] S1: Apply a layer of anti-corrosion grease to the threaded part of the connecting cable at the fixed end of the anti-falling beam.

[0029] S2: Sequentially thread the fixed-end buffer rubber, fixed-end buffer backing plate, and deviation-correcting inclined pad ring onto the fixed end of the anti-falling beam on the connecting cable. Align the fixed-end buffer rubber with the groove on the steel pad base plate, screw the nut onto the anchor cup at the fixed end of the connecting cable of the anti-falling beam, and make the exposed thread of the anchor cup at this end greater than or equal to the thickness of one nut; finally, tighten the nut and tighten the set screw.

[0030] The specific method for installing the anti-falling beam moving part and adjusting the moving amount in the fifth step is as follows:

[0031] S1: Apply a layer of anti-corrosion grease to the threaded part of the connecting cable at the moving end of the anti-falling beam.

[0032] S2: Sequentially thread the moving-end buffer rubber, moving-end buffer backing plate, spring, and stop plate onto the moving end of the anti-falling beam on the connecting cable. Screw the nut onto the anchor cup at this end of the connecting cable. Align the spring with the grooves on the moving-end buffer backing plate and the stop plate. Pre-tighten the spring by screwing the nut. During the process of screwing the nut, the anchoring end face of the connecting cable is perpendicular to the hole duct of the beam slab reserved hole, and the steel pad base plate is closely attached to the beam surface and the nut; if the anchoring end face of the connecting cable is not perpendicular to the hole duct of the beam slab reserved hole, level it with a steel plate.

[0033] S3: Screw the nut at the moving end according to the preset moving amount until the spring is compressed to the preset moving amount. If the spring has not been compressed to the preset moving amount after adjusting the moving end, then adjust the nut at the fixed end until the preset moving amount is satisfied.

[0034] The specific method for anti-corrosion treatment in the sixth step is as follows:

[0035] S1: Repaint and apply anti-corrosion treatment to the parts on the anti-falling beam fixing part and anti-falling beam moving part that are bumped or scratched.

[0036] S2: Apply a layer of anti-corrosion grease to the exposed threads of the anchor cups at both ends of the connecting cable and the nuts.

[0037] The specific method of installing the protective cover in step seven is as follows, including the installation of the fixed part protective cover and the installation of the movable part protective cover; the installation method of the fixed part protective cover of the anti-drop beam and the movable part protective cover of the anti-drop beam are the same; the installation method of the fixed part protective cover of the anti-drop beam is to install the O-ring into the groove of the fixed end protective cover, and then buckle the fixed end protective cover onto the steel pad bottom plate and fix it with screws, and then paint the scratched part of the fixed end protective cover.

[0038] Beneficial effects:

[0039] (1) Guaranteed installation quality. The present invention utilizes the steel cage, the gap between the two transverse beams and the top of the cap beam as the process construction platform. Compared with the lifting vehicle, the working platform is more stable and is not affected by strong winds, so the installation quality can be guaranteed.

[0040] (2) Shortened construction period. The present invention utilizes the gap between the installation of the entire span beam and the welding of the main reinforcement of the transverse beam, and the construction of the beam-slab wet joint, and uses the steel cage and the top of the cap beam as the construction platform to carry out the installation work. This is faster than the operation on the lifting platform and shortens the construction period.

[0041] (3) Reduced costs. The present invention does not require the use of lifting machinery and equipment, which reduces equipment rental and auxiliary tools, and also reduces the number of auxiliary personnel. At the same time, the installation materials can be placed nearby, reducing the cost of secondary material handling and saving construction costs.

[0042] (4) Saving human resources. The present invention requires fewer people per team, which reduces the number of auxiliary workers compared to the installation of a lift truck.

[0043] (5) Safe and reliable. The installation platform (beam cap) of the present invention is close to the bridge deck, and the reserved hole for preventing the falling beam is about 1m away from the bridge deck. The installers go up and down through the steel cage, and the double safety belts can be hung on the nearby ring steel bars of the beam-slab wet joint. The delivery of the anti-falling beam can be operated by two people on the bridge deck, eliminating the safety hazard of the lifting vehicle being affected by strong winds.

[0044] (6) Small environmental impact. Compared with traditional construction methods, this invention has no mechanical exhaust emissions, no oil leakage, no need to build an operating platform, and has little impact on the surrounding ecological environment.

[0045] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the attached drawings required for use in the embodiments. Obviously, the attached drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0047] Figure 1 This is the installation flow chart of the present invention.

[0048] Figure 2 This is the construction layout schematic diagram of the anti-falling beam of the present invention.

[0049] Figure 3 This is the structural schematic diagram of the anti-falling beam of the present invention.

[0050] Figure 4 This is the structural schematic diagram of the steel bar suspension cage in the present invention.

[0051] In the figure: 1. Fixed end protective cover; 2. Set screw; 3. Nut; 4. Deviation-correcting bevel washer; 5. Fixed end buffer backing plate; 6. Fixed end buffer rubber; 7. First embedded part; 8. Connecting cable; 9. Second embedded part; 10. Mobile end buffer rubber; 11. Mobile end buffer backing plate; 12. Spring; 13. Stop baffle; 14. Mobile end protective cover; 15. Anti-falling beam; 16. Beam body; 17. Steel bar suspension cage; 18. Cross diaphragm; 19. Mobile end of anti-falling beam; 20. Fixed end of anti-falling beam; 21. Main connecting reinforcement of cross diaphragm; 22. Beam surface; 23. Padstone; 24. Cap beam; 25. Hook; 26. Steel bar column; 27. Open hook; 28. Bottom backing plate; 29. Connecting reinforcement; 30. Steel pad bottom plate. Specific embodiments

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0053] Embodiment 1:

[0054] According to Figures 1-3 An installation construction method for the prestressed cable anti-falling beam of a high pier simply supported beam bridge shown, includes the following steps:

[0055] Step 1: Construction preparation;

[0056] Step 2: Place the connecting cable 8 of the anti-falling beam 15

[0057] When the entire span of the beam body is installed in place and the main reinforcement bars of the cross diaphragm are welded, and there is a gap before the wet joint of the beam slab is constructed, the connecting cable 8 is placed.

[0058] Step Three: Fix the steel cushion plate.

[0059] Step Four: Install the anti-falling beam fixing part.

[0060] Step Five: Install the anti-falling beam moving part and adjust the moving amount.

[0061] Step Six: Anti-corrosion treatment.

[0062] Step Seven: Install the protective cover.

[0063] In this embodiment, the anti-falling beam 15 used adopts the existing technology. The anti-falling beam 15 at least includes a fixing part, a connecting cable 8 and a moving part; both ends of the connecting cable 8 are provided with threaded anchor cups; the fixing part is connected to the moving part through the connecting cable 8; the fixing part includes a set screw 2, a nut 3, a deviation-correcting inclined gasket 4, a fixed-end buffer pad 5, a fixed-end buffer rubber 6 and a steel cushion plate 30. The steel cushion plate 30 is fixed on the cross diaphragm 18 on the beam body 16. The fixed-end buffer rubber 6, the fixed-end buffer pad 5 and the deviation-correcting inclined gasket 4 are sequentially sleeved on the connecting cable 8 on one side of the connecting and fixing part from the inside to the outside. The outside of the deviation-correcting inclined gasket 4 is fixed by screwing the nut 3 tightly, and the nut 3 is fastened on the anchor cup of the connecting cable 8 through the set screw 2. The outside of the set screw 2, the nut 3, the deviation-correcting inclined gasket 4, the fixed-end buffer pad 5 and the fixed-end buffer rubber 6 is covered with a fixed-end protective cover 1, and the fixed-end protective cover 1 is fixed on the steel cushion plate 30; the moving part includes a set screw 2, a nut 3, a moving-end buffer rubber 10, a moving-end buffer pad 11, a spring 12, a stop baffle 13 and a steel cushion plate 30. The steel cushion plate 30 is fixed on the cross diaphragm 18 of the beam body 16 opposite to the connecting and fixing part. The moving-end buffer rubber 10, the moving-end buffer pad 11, the spring 12 and the stop baffle 13 are sequentially sleeved on the connecting cable 8 of the moving end 19 of the anti-falling beam from the inside to the outside. The outside of the stop baffle 13 is fixed by screwing the nut 3 tightly, and the nut 3 is fastened on the anchor cup of the connecting cable 8 through the set screw 2. The outside of the set screw 2, the nut 3, the moving-end buffer rubber 10, the moving-end buffer pad 11, the spring 12 and the stop baffle 13 is covered with a moving-end protective cover 14, and the moving-end protective cover 14 is fixed on the steel cushion plate 30.

[0064] In the steel cushion plate 30 of this embodiment, the surface contacting the beam is a plane, and the outer edge of the surface contacting the fixed-end buffer rubber 6 or the moving-end buffer rubber 10 is provided with a protrusion, and a groove for accommodating the fixed-end buffer rubber 6 or the moving-end buffer rubber 10 is formed inside it. Through holes for connecting with the fixed-end protective cover 1 and the moving-end protective cover 14 are provided on the surface of the protrusion.

[0065] When the beam body 16 is prefabricated, the first embedded part 7 and the second embedded part 9 for connecting the passing stay cable 8 are respectively arranged on adjacent beam bodies 16.

[0066] During the prefabrication and installation of the beam body 16 until the whole-span beam body is installed in place, when the main connecting bars 21 of the diaphragm beam are welded, and there is a gap when the wet joint steel bars of the beam slab have not been welded, or wet joint holes are reserved at both ends of the diaphragm beam 18. Using the reinforcing cage 17, the gap between the two diaphragm beams 18 and the top of the cap beam 24 as the construction platform for the process, the beam surface 22 is used for manually transporting and installing components, and after passing through the beam, the installation is carried out successively from the anti-falling beam fixed end 20 to the anti-falling beam mobile end 19.

[0067] In specific applications, the present invention uses the gap between the two diaphragm beams and the top of the cap beam 24 as the construction platform for the process. Compared with the lift truck, the operation platform is more stable and not affected by strong winds, and the installation quality can be guaranteed. The operation of the present invention utilizes the gap when the whole-span beam body is installed in place and the main bars of the diaphragm beam are welded, while the wet joints of the beam slab have not been constructed. Using the reinforcing cage 17 and the top of the cap beam 24 as the construction platform to carry out the installation work is faster than the operation of the lift truck platform, shortening the construction period. The present invention does not require the use of lifting machinery and equipment, reduces equipment leasing and auxiliary tools, and also reduces the number of auxiliary personnel. At the same time, the installation materials can be placed nearby, reducing the secondary handling cost of materials and saving the construction cost. The present invention requires fewer personnel in each team, and compared with the installation by lift truck, it reduces the auxiliary operation personnel and saves human resources. Compared with the traditional construction method, the present invention has no mechanical exhaust gas emissions, oil leakage, and does not require the construction of an operation platform, and has basically no impact on the surrounding ecological environment.

[0068] Embodiment 2:

[0069] According to Figure 1 An installation construction method for the anti-falling beam of the prestressed stay cable of a high pier simply supported beam bridge as shown, the difference from Embodiment 1 is that: the construction preparation in Step 1 is completed before the production of the anti-falling beam 15, and the following operations are carried out for the construction preparation:

[0070] S1: Check and calibrate the elevation, size, and coordinates of the bearing pad stone 23 on the top of the cap beam 24, and handle it in time if there are deviations;

[0071] S2: Measure and check the geometric dimensions of the beam body, the positions of the reserved holes, and the camber according to the nameplate of the precast beam slab, and obtain the data of the inner diameter of the reserved holes and the net distance at the connecting end after beam erection.

[0072] During actual use, the construction preparation is carried out before the anti-falling beam 15 is delivered to the site. First, check the elevation, dimensions, and coordinates of the bearing pad 23 provided on the top of the pier cap 24. If there are any deviations, they should be promptly corrected to ensure accuracy. Second, measure and check the geometric dimensions, positions of the reserved holes, and cambers of the beam body 16 according to the nameplate of the precast beam slab, and provide the inner diameter of the reserved holes and the clear distance at the connecting end after beam erection for the actual fabrication of the anti-falling beam 15. Ensure that the anti-falling beam 15 matches the actual situation on-site to enable smooth installation.

[0073] Embodiment 3:

[0074] According to Figures 1-3 An installation construction method for a prestressed cable anti-falling beam of a high pier simply supported beam bridge as shown, which is different from Embodiment 1 in that: The specific method for placing the connecting cable 8 of the anti-falling beam in Step 2 is as follows:

[0075] S1: Loosen the set screws 2 at both ends of the connecting cable 8 on the anti-falling beam 15, and screw out the nuts 3 at both ends;

[0076] S2: When the installation position of the connecting cable 8 is at the top of the pier cap 24, the operator stands on the top of the pier cap 24. Otherwise, lower the steel bar cage 17 into the gap between two adjacent cross diaphragms 18 and fix it, and then the operator enters the steel bar cage 17;

[0077] S3: Place the connecting cable 8 to the installation position, adjust the angle of the connecting cable 8, and pass one end of it through the reserved hole on the beam body 16. Then, guide the connecting cable 8 between the two holes to prevent the cable from being scratched; subsequently, pass the connecting cable through the reserved hole on the other end beam body 16.

[0078] During actual use, open the outer packaging of the anti-falling beam. At this time, pay attention to avoiding damaging the thermoplastic resin outer protective shell of the prestressed cable part between the screw rods at both ends of the connecting cable 8. Loosen the set screws 2 and screw out the nuts 3 at both ends, and then slowly place the connecting cable 8 to the installation position, adjust the angle of the connecting cable 8, and pass the connecting cable 8 through the reserved hole on the T-shaped beam body 16 from one end. When perforating, pay attention to avoiding damaging the cable body PE and the anchor cup thread. If the thread is damaged, use a file to smooth it for the installation of the end nut 3. Before passing through the reserved hole of the other end T-shaped beam body 16, the connecting cable 8 should be guided between the two holes, that is, the installer stands on the pier cap 24 between two oppositely arranged beam bodies 16, holds the front screw rod part of the connecting cable 8 by hand, and adjusts the cable passing direction according to the relative angle between the beam bodies or the deviation of the relative position of the reserved holes, so that it can pass through the reserved hole at the end of this T-shaped beam body 16 smoothly, and prevent the reserved hole wall from scratching the thermoplastic resin outer protective shell and the thread on the connecting cable 8.

[0079] Embodiment 4:

[0080] According toFigure 4 An installation construction method for the anti-falling beam of prestressed cables of a simply supported beam bridge with high piers, which is different from the first embodiment in that: the steel bar suspension cage 17 includes a lifting hook 25, a steel bar column 26, an open hook 27, a bottom cushion plate 28 and connecting bars 29; the bottom cushion plate 28 is a square plate, and a steel bar column 26 is vertically connected to each of its four corners; a lifting hook 25 is fixedly connected to the top of each steel bar column 26, and multiple connecting bars 29 are horizontally connected between adjacent steel bar columns 26; an open hook 27 is connected to the connection part between at least one steel bar column 26 and the connecting bar 29 on one side; safety belts are respectively connected to the oppositely arranged connecting bars 29.

[0081] In actual use, the operator can be sent to the operation platform through the steel bar suspension cage 17, and it can also be used as an operation platform.

[0082] In specific applications, the installation platform, such as the top surface of the cap beam, is relatively close to the bridge deck, and the anti-falling beam reserved hole is about 1 m away from the bridge deck. By tying safety belts on the steel bar suspension cage 17, two people operate the steel bar suspension cage 17 up and down to transport installation personnel into or out of the operation platform, or directly install and operate on the steel bar suspension cage 17. The steel bar suspension cage 17 adopting the above technical solution can be hung on the circular steel bars of the wet joint of the beam slab through the lifting hook 25 nearby, and can be hung on the nearby steel bars through the open hook 27, or a safety belt can also be tied on the open hook 27 for connecting the steel bar suspension cage 17 with the adjacent steel bars, ensuring the stability of the steel bar suspension cage 17 and eliminating the safety hazards in the prior art caused by the use of a lift truck being affected by strong wind weather.

[0083] Example Five:

[0084] According to Figure 1 and Figure 3 An installation construction method for the anti-falling beam of prestressed cables of a simply supported beam bridge with high piers, which is different from the first embodiment in that: the specific method for fixing the steel pad bottom plate in step three is as follows:

[0085] S1: Locate the centering dimension of the steel pad bottom plate 30 on the anchoring surfaces of the anti-falling beam 15 and the diaphragm beam 18 on the relatively arranged beam body 16;

[0086] S2: Pass the steel pad bottom plates 30 at both ends through the connecting cables 8 respectively, and make the steel pad bottom plates 30 at both ends centered, and make the steel pad bottom plates 30 perpendicular to the hole channels of the beam slab reserved holes;

[0087] S3: Pre-tighten the steel pad bottom plate 30, and then adjust the steel pad bottom plate 30 so that the connecting cable 8 can be adjusted and moved in the hole of the steel pad bottom plate 30, and then fasten the steel pad bottom plate 30 in the diagonal order.

[0088] In actual use, if the center deviation of the reserved holes on the two opposite T-shaped beam bodies 16 is relatively large, the steel cushion bottom plate 30 needs to be moved accordingly to keep the connecting cable 8 horizontal. Then, drill holes with an electric drill according to the size of the expansion screws, and fix the steel cushion bottom plate by installing the expansion screws. The steel cushion bottom plate is a square plate, and connecting through holes for the expansion screws and the beam body 16 are respectively arranged at its four corners, and a circular through hole for the connecting cable 8 to pass through is opened at its central position. During installation, all four expansion screws are pre-tightened, and then the steel cushion bottom plate 30 is adjusted so that the connecting cable 8 can move and be adjusted at the center of the steel cushion bottom plate 30. Finally, tighten the expansion screws in a diagonal order.

[0089] Example Six:

[0090] According to Figures 1-3 A method for installing and constructing a prestressed cable anti-falling beam of a high pier simply supported beam bridge as shown, which is different from Example One in that: the specific method for installing the anti-falling beam fixing part in Step Four is as follows:

[0091] S1: Apply a layer of anti-corrosion grease to the threaded part of the connecting cable 8 of the anti-falling beam fixed end 20;

[0092] S2: Sequentially put the fixed end buffer rubber 6, the fixed end buffer backing plate 5, and the deviation-correcting inclined washer 4 onto the anti-falling beam fixed end 20 on the connecting cable 8. Align the fixed end buffer rubber 6 with the groove on the steel cushion bottom plate 30, screw the nut 3 onto the anchor cup of the anti-falling beam fixed end 20 of the connecting cable 8, and make the exposed threaded part of the anchor cup at this end greater than or equal to the thickness of one nut 3; finally, tighten the nut 3 and tighten the set screw 2.

[0093] In actual use, the application of the anti-corrosion grease makes the connecting cable 8 not easily decay and extends its service life. The design that the exposed threaded part of the anchor cup is greater than or equal to the thickness of one nut 3 can prevent the set screw from being insufficiently tightened or failing, or the nut from backing off or slipping due to excessive tension, thereby causing the nut to fall off and resulting in the failure of the anti-falling beam 15.

[0094] Example Seven:

[0095] According to Figure 1 and Figure 3 A method for installing and constructing a prestressed cable anti-falling beam of a high pier simply supported beam bridge as shown, which is different from Example One in that: the specific method for installing the anti-falling beam moving part and adjusting the moving amount in Step Five is as follows:

[0096] S1: Apply a layer of anti-corrosion grease to the threaded part of the connecting cable 8 of the anti-falling beam mobile end 19;

[0097] S2: Sequentially pass the mobile buffer rubber 10, mobile buffer backing plate 11, spring 12, and stop baffle 13 through the anti-falling beam mobile end 19 of the connecting cable 8. Screw the nut 3 onto the anchor cup at this end of the connecting cable 8. Align the spring 12 with the grooves of the mobile buffer backing plate 11 and the stop baffle 13. Pre-tighten the spring 12 by screwing the nut 3. During the process of screwing the nut 3, the anchoring end face of the connecting cable 8 is perpendicular to the hole channel of the preformed hole in the beam slab, and the steel cushion bottom plate 30 is in close contact with the beam surface and the nut 3. If the anchoring end face of the connecting cable 8 is not perpendicular to the hole channel of the preformed hole in the beam slab, level it with a steel plate.

[0098] S3: Screw the nut 3 at the mobile end according to the preset movement amount until the spring 12 is compressed to the preset movement amount. If the spring 12 has not been compressed to the preset movement amount after adjusting the mobile end, then adjust the nut 3 at the fixed end until the preset movement amount is satisfied.

[0099] Embodiment Eight:

[0100] According to Figures 1-3 An installation construction method for the prestressed cable anti-falling beam of a high pier simply supported beam bridge shown in, the difference from Embodiment One is that the specific method of anti-corrosion treatment in Step Six is as follows:

[0101] S1: Repaint and anti-corrode the places on the anti-falling beam fixed part and the anti-falling beam moving part that are bumped or scratched.

[0102] S2: Apply a layer of anti-corrosion grease to the exposed threads and nuts of the anchor cups at both ends of the connecting cable 8.

[0103] During actual use, the adoption of the anti-corrosion treatment process effectively extends the service life of the anti-falling beam 15.

[0104] Embodiment Nine:

[0105] According to Figure 1 and Figure 3 An installation construction method for the prestressed cable anti-falling beam of a high pier simply supported beam bridge shown in, the difference from Embodiment One is that the specific method of installing the protective cover in Step Seven is as follows, including the installation of the fixed part protective cover and the installation of the mobile part protective cover; the installation methods of the protective covers for the anti-falling beam fixed part and the anti-falling beam moving part are the same; the installation method of the protective cover for the anti-falling beam fixed part is to install the O-ring into the groove of the fixed non-protective cover 1, then buckle the fixed non-protective cover 1 onto the steel cushion bottom plate 30 and fix it with screws, and then paint the scratched places of the fixed part protective cover 1.

[0106] In this embodiment, the protective covers for the anti-falling beam fixed part and the anti-falling beam moving part are both hollow frustum-shaped structures with a closed top and an open bottom. Their open ends are connected to the steel cushion bottom plate 30, and their ends are provided with grooves in the shape of an annular ring that fit and connect with the outer eaves protrusions of the steel cushion bottom plate 30, and connecting through holes are opened at the bottom of the grooves.

[0107] During specific installation, install the O-ring into the groove of the protective cover, then fasten the protective cover onto the steel gasket bottom plate 30, align the through holes on the protective cover and the steel gasket bottom plate 30, screw in screws into each aligned hole, and then tighten all the screws in sequence. After that, perform painting treatment on the scratched parts of the protective cover.

[0108] The setting of the protective cover avoids the anti-falling beam fixed end and the anti-falling beam moving end from being eroded by rain and snow, effectively extending their service life.

[0109] Without conflict, those skilled in the art can combine the relevant technical features in the above examples according to actual situations to achieve corresponding technical effects. Specific combinations are not elaborated here one by one.

[0110] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0111] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0112] As mentioned above, this is only a preferred embodiment of the present invention. The present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein. Any simple modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for installing and constructing a prestressed cable anti-fall beam for a high-pier simply supported beam bridge, characterized by: The steps include: Step 1: Construction preparation; Step 2: Install the connecting cable (8) of the anti-fall beam (15) When the entire span beam is installed in place, the main reinforcement of the transverse beam is welded, and the beam-slab wet joint has not yet been constructed, the connecting cable (8) is placed; Step 3: Fix the steel base plate; Step 4: Install the anti-fall beam fixing part; Step 5: Install the anti-drop beam moving part and adjust the movement; Step 6: Anti-corrosion treatment; Step 7: Install the protective cover; The specific method of placing the connecting cable (8) of the anti-fall beam (15) in step 2 is as follows: S1: Loosen the set screws (2) at both ends of the connecting cable (8) on the anti-drop beam (15), and unscrew the nuts (3) at both ends; S2: When the connection cable (8) is installed at the top of the cap beam (24), the operator stands on the top of the cap beam (24). Otherwise, the steel cage (17) is lowered into the gap between the two adjacent transverse beams (18) and fixed, and then the operator enters the steel cage (17); S3: Place the connecting cable (8) at the installation position, adjust the angle of the connecting cable (8), and pass one end of the connecting cable through the reserved hole on the beam body (16). Then, guide the connecting cable (8) between the two holes to prevent the cable from being scratched. Then, pass the connecting cable through the reserved hole on the other end of the beam body (16).

2. The method for installing and constructing a prestressed cable anti-fall beam for a high-pier simply supported beam bridge according to claim 1, characterized in that: The construction preparation of step 1 is completed before the anti-fall beam (15) is made, and the construction preparation is carried out as follows: S1: Check the elevation, size and coordinates of the top stone of the cap beam and deal with any deviations in a timely manner; S2: Measure and verify the geometric dimensions of the beam, the position of the reserved holes, and the camber according to the nameplate of the precast beam slab, and obtain the inner diameter of the reserved holes and the net distance between the connection ends after the beam is erected.

3. The installation and construction method of a prestressed cable anti-fall beam for a high-pier simply supported beam bridge according to claim 1, characterized in that: The steel bar cage (17) comprises a hook (25), a steel bar column (26), an open hook (27), a bottom pad (28) and a connecting rib (29); the bottom pad (28) is a square plate, and its four corners are respectively vertically connected to a steel bar column (26); the top of each steel bar column (26) is fixedly connected to a hook (25), and a plurality of connecting ribs (29) are horizontally connected between adjacent steel bar columns (26); an open hook (27) is connected to the connection between a steel bar column (26) and the connecting rib (29) on at least one side.

4. The method for installing and constructing a prestressed cable anti-fall beam for a high-pier simply supported beam bridge according to claim 1, characterized in that: The specific method of fixing the steel base plate in step 3 is as follows: S1: The centering dimension of the steel pad bottom plate (30) positioned on the anchoring surface of the anti-fall beam (15) and the diaphragm beam (18) on the beam body (16) disposed oppositely; S2: Pass the steel pad bottom plates (30) at both ends onto the connecting cables (8) respectively, and align the steel pad bottom plates (30) at both ends, and make the steel pad bottom plates (30) perpendicular to the reserved holes of the beam and slab; S3: Pre-tighten the steel pad bottom plate (30), then adjust the steel pad bottom plate (30) so that the connecting cable (8) can be adjusted and moved in the hole of the steel pad bottom plate (30), and then tighten the steel pad bottom plate (30) in a diagonal order.

5. The method for installing and constructing a prestressed cable anti-fall beam for a high-pier simply supported beam bridge according to claim 1, characterized in that: The specific method of installing the anti-fall beam fixing part in step 4 is as follows: S1: Apply a layer of anti-corrosion grease to the threaded portion of the connecting cable (8) of the fixed end (20) of the anti-fall beam; S2: sequentially thread the fixed end buffer rubber (6), the fixed end buffer pad (5), and the deflection correction pad (4) onto the anti-drop beam fixed end (20) on the connecting cable (8), align the fixed end buffer rubber (6) with the groove on the steel pad bottom plate (30), screw the nut (3) onto the anchor cup of the anti-drop beam fixed end (20) of the connecting cable (8), and make the exposed thread of the anchor cup at this end greater than or equal to the thickness of one nut (3); finally, tighten the nut (3) to tighten the set screw (2).

6. The method for installing and constructing a prestressed cable anti-fall beam for a high-pier simply supported beam bridge according to claim 1, characterized in that: The specific method of installing the anti-fall beam moving part and adjusting the movement amount in step 5 is as follows: S1: Apply a layer of anti-corrosion grease to the threaded portion of the connecting cable (8) of the anti-drop beam moving end (19); S2: sequentially thread the mobile end buffer rubber (10), the mobile end buffer pad (11), the spring (12), and the stop plate (13) onto the anti-drop beam mobile end (19) of the connecting cable (8), screw the nut (3) onto the anchor cup of this end of the connecting cable (8), align the spring (12) with the grooves of the mobile end buffer pad (11) and the stop plate (13), and pre-tighten the spring (12) by screwing the nut (3). During the process of screwing the nut (3), the anchor end face of the connecting cable (8) is perpendicular to the reserved hole of the beam plate, and the steel pad bottom plate (30) is in close contact with the beam surface and the nut (3); if the anchor end face of the connecting cable (8) is not perpendicular to the reserved hole of the beam plate, it is leveled by a steel plate; S3: Twist the nut (3) of the movable end according to the preset movement amount until the spring (12) is compressed to the preset movement amount. If the movable end is not compressed to the preset movement amount after adjustment, adjust the nut (3) of the fixed end until the preset movement amount is met.

7. The method for installing and constructing a prestressed cable anti-fall beam for a high-pier simply supported beam bridge according to claim 1, characterized in that: The specific method of the anti-corrosion treatment in step 6 is as follows: S1: Repaint the areas where the fixed part and the movable part of the anti-fall beam are hit or scratched for corrosion protection; S2: Apply a layer of anti-corrosion grease to the exposed threads and nuts of the anchor cups at both ends of the connecting cable (8).

8. The method for installing and constructing a prestressed cable anti-fall beam for a high-pier simply supported beam bridge according to claim 1, characterized in that: The specific method of installing the protective cover in step seven is as follows: it includes the installation of the protective cover of the fixed part and the installation of the protective cover of the movable part; the installation method of the protective cover of the fixed part of the anti-drop beam and the movable part of the anti-drop beam is the same; the installation method of the protective cover of the fixed part of the anti-drop beam is to install the O-ring into the groove of the fixed end protective cover (1), then buckle the fixed end protective cover (1) onto the steel pad bottom plate (30) and fix it with screws, and then paint the scratched part of the fixed end protective cover (1).

Images