Concrete box girder prefabricated segmental girder formwork system and construction method thereof

Abstract

The invention relates to the technical field of bridge engineering, and discloses a concrete box girder prefabricated segmental girder formwork system and a construction method thereof.The concrete box girder prefabricated segmental girder formwork system comprises a connecting beam frame and fences, the fences are fixedly connected to the upper surface of the connecting beam frame, and an end formwork is detachably installed on the front surface of the connecting beam frame; a side formwork is fixedly connected to the lower portion of the front surface of the connecting beam frame, a side formwork is detachably installed on the upper surface of the side formwork, and an auxiliary formwork is detachably installed on the lower portion of the side formwork. Through the arrangement of the end formworks, the side formworks, the auxiliary formworks, the movable bottom formworks, the walking sliding shoes, the jacks, the reinforcement cages and the side formwork frames, a short line matching method is adopted for prefabrication, a formwork system is matched, reasonable hydraulic jack arrangement is adopted, precise formwork adjustment, supporting and demolding are achieved, the segmental beam prefabrication precision is improved, the bridge splicing quality is guaranteed, the construction process is optimized, and the construction efficiency is improved. All procedures are closely connected, construction time is shortened, and construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and particularly to a formwork system for precast segmental concrete box girders and a construction method thereof. Background Art

[0002] In bridge construction, the precast construction technology of concrete box girder segments is a key link in constructing modern large bridges. In the early stage, long-line method construction was mostly adopted for precasting bridge segments. This method requires a long precast pedestal to be set along the bridge axis direction, and the length of the pedestal often reaches dozens of meters or even hundreds of meters. Its principle is to complete the precasting of multiple segments in sequence on the pedestal according to the designed alignment of the bridge.

[0003] With the progress of bridge construction technology, short-line method precasting emerged as the times require. The short-line method precasting abandons the long pedestal mode and realizes the efficient precasting of segments through the cooperation of a matching pedestal and a casting pedestal. In short-line method construction, a matching beam is used to match with the newly cast segment to ensure the connection accuracy between segments.

[0004] With the progress of technology, short-line method precasting has gradually been applied. However, there are still deficiencies in the existing short-line method precasting in terms of the formwork system and construction process. In the formwork system, the structural design of some formworks is not reasonable enough. For example, the support stability of the formwork is insufficient, and problems such as formwork bulging and leakage are likely to occur during concrete pouring, affecting the appearance quality and dimensional accuracy of the segments; moreover, the demoulding and formwork adjustment operations of some formworks are complex, consuming a large amount of manpower and time, and reducing the construction efficiency. In terms of the construction process, the connection between each process is not tight enough. For example, during the beam moving and matching beam adjustment process, it is difficult to ensure the positioning accuracy, resulting in deviation of the overall alignment after segment splicing, affecting the mechanical properties and aesthetics of the bridge. In view of this, we propose a formwork system for precast segmental concrete box girders and a construction method thereof. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the present invention provides a formwork system for precast segmental concrete box girders and a construction method thereof, which solve the problems of the existing short-line method precasting in terms of the formwork system and construction process.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A precast segment beam formwork system for a concrete box girder, comprising a connecting beam frame and a fence. The upper surface of the connecting beam frame is fixedly connected with a fence. The front surface of the connecting beam frame is detachably installed with an end form. The lower part of the front surface of the connecting beam frame is fixedly connected with a side formwork frame. The upper surface of the side formwork frame is detachably installed with a side form. The lower part of the side form is detachably installed with an auxiliary form. One end of the auxiliary form away from the side form is detachably connected with a bottom form. Jacks are fixedly connected to the lower surfaces of the side form, the auxiliary form, and the bottom form. A walking sliding shoe is arranged below the jack at the lower part of the auxiliary form. A steel reinforcement cage is inserted into the inner surface of the end form. Oil supply regulating devices are arranged on both the left and right sides of the connecting beam frame, and the oil supply regulating devices include auxiliary oil coating devices.

[0007] Preferably, branch platforms extend forward on both the left and right sides of the connecting beam frame. Through holes are provided on the inner surface of the connecting beam frame according to the shape of the bridge. Through holes are provided on the inner surface of the end form according to the shape of the bridge. Two sets of side forms, side formwork frames, and auxiliary forms are provided, and they are symmetrically distributed with the central axis of the end form as the axis of symmetry. The side forms, the auxiliary form, and the bottom form are in close contact. Wind nozzle side formboards are arranged on the outer sides of both the left and right side forms. The jack at the lower part of the auxiliary form is slidably connected with the walking sliding shoe. The inside of the steel reinforcement cage is supported by steel bar connections.

[0008] Preferably, the oil supply regulating device includes an oil storage tank. A fuel supply pipe is connected to the lower part of the oil storage tank. A winding frame is wound around the outer surface of the fuel supply pipe. One end of the fuel supply pipe away from the oil storage tank is communicated with a connection chamber. A toothed shaft is engaged with the front surface of the end form. One end of the toothed shaft away from the end form is fixedly connected with a motor. A hydraulic rod is fixedly connected to the outer surface of the motor through a connecting piece. The upper part of the hydraulic rod is fixedly connected with a connection chamber. A connection frame is fixedly connected to the outer arc surface of the connection chamber. A shielding plate is fixedly connected to the inner surface of the connection frame through bolts.

[0009] Preferably, the auxiliary oil coating device includes a one-way bearing. The inner surface of the one-way bearing is fixedly connected with the connection frame. A plug rod is fixedly connected to the outer surface of the one-way bearing. A coating roller is fixedly connected to the outer surface of the one-way bearing. One end of the plug rod away from the one-way bearing is fixedly connected with an inner rod. A rotating block is rotatably connected to the outer arc surface of the inner rod. Two sets of symmetrically arranged limit protrusions are arranged at both the front and rear ends of the rotating block. A swing rod is fixedly connected to the lower part of the outer arc surface of the rotating block.

[0010] Preferably, the lower surface of the oil storage tank is fixedly connected to the connecting beam frame. An oil pump is provided at the connection between the oil storage tank and the oil supply pipe. The roller at the center of the winding frame is rotatable. A toothed groove is formed on the front surface of the end mold and meshes with a toothed shaft. A plurality of rectangular slots are formed on the outer arc surface of the connecting frame, and positioning bolts equal in number to the rectangular slots are threadedly connected to the front surface of the connecting frame.

[0011] Preferably, the inner arc surface of the shielding plate is in close contact with the oiling roller. The upper part of the shielding plate is arc-shaped. A threaded through hole is formed in the lower part of the shielding plate. The arc degrees of the upper arc-shaped areas of the plurality of shielding plates are the same and evenly divide the outer arc surface of the oiling roller. An L-shaped through hole is formed inside the connection bin.

[0012] Preferably, a plurality of through holes are formed on the outer arc surface of the oiling roller. Hard valves are arranged in each group of internal through holes of the oiling roller. Through holes are formed at the centers of the inner surfaces of the one-way bearing and the connecting frame, and the centers of the one-way bearing, the connecting frame, and the connection bin are connected and communicated.

[0013] Preferably, a rectangular protrusion is arranged on the outer arc surface of the inner rod near the rotating block. An annular groove is formed at the center of the inner surface of the rotating block. The inner surface of the rotating block is elastically connected to the inner rod through a scroll spring.

[0014] A construction method for a formwork system of precast segmental beams of a concrete box girder uses the above-mentioned formwork system of precast segmental beams of a concrete box girder and includes the following processes:

[0015] S1: Formwork installation process

[0016] The fixed bottom formwork, side formwork, and jacks of the matching beam adjustment hydraulic system are initially installed and positioned according to their respective independent control requirements. The vertical, horizontal, and longitudinal oil cylinders are retracted to the specified dimensions. The beam moving hydraulic system installs oil cylinders according to the reaction points and arranges pump stations to complete the formwork installation, and an oiling treatment is performed on the formwork surface.

[0017] S2: Segmental beam demolding process

[0018] After the concrete is poured and cured to reach the strength, the movable end formwork and inner formwork are removed in sequence. After the prestress tensioning and grouting are completed, the connecting components of the movable bottom formwork are removed. Then, the relevant components of the side formwork are removed and the hydraulic system is operated for demolding. Then, the mechanical lock of the jack of the fixed bottom formwork is released and the oil cylinder is retracted for demolding. Finally, the beam segment is translated by operating the beam moving jack to complete the demolding of the fixed end formwork.

[0019] S3: Beam moving process

[0020] After the fixed-end formwork is demoulded, check the detachment of the beam body from the formwork; set up the traction reaction seat and cross beam, and drive the sliding shoe to move forward by jacking with a hydraulic cylinder; synchronously operate the cylinders on both sides of the slideway to control the longitudinal movement of the beam segment, observe the scale marks to adjust and correct the deviation, and determine the moving distance according to the length of the next beam segment;

[0021] S4: Matching beam adjustment process

[0022] When the beam segment is moved to the matching pedestal area, remove the relevant components; arrange new components on the pouring pedestal, install shear keys, overflow grooves and adjust the formwork; install connecting bolts and tensioned precision rolled threaded steel, and hoist the steel bar cage; jack up the matching beam adjustment jack, and move the matching beam segment back; measure and mark the central axis, and finely adjust the attitude; lower the matching beam to fit the shore-side end face, and adjust the bottom plate elevation and slope to complete the matching;

[0023] S5: Support conversion pedestal system conversion process

[0024] After the matching beam adjustment is completed and the concrete of the poured beam segment is cured, move the beam to separate the matching beam from the poured beam segment; remove the relevant components of the matching pedestal, and move the beam to the support conversion pedestal; install new components in the movable bottom formwork area of the pouring pedestal, and set up the formwork; connect to the jack control system, jack out the jack and put in the beam moving sliding shoe, and place the beam body; remove the relevant components of the support conversion pedestal and transfer them to the pouring pedestal.

[0025] Preferably, in the S2 segment beam demoulding process, the following steps are included:

[0026] S201: Demoulding of the movable end formwork

[0027] After the concrete is cured to reach the strength, remove the movable end formwork in blocks; let the matching beam end face descend by 2-3 mm by the three-way jack to separate, and then use the beam moving hydraulic jack to move and demould;

[0028] S202: Removal of the inner formwork

[0029] After the end formwork is removed and the concrete strength of the beam segment meets the standard, remove the inner formwork of the inner bin, manhole formwork and matching angle steel;

[0030] S203: Demoulding of the movable bottom formwork

[0031] After the concrete strength meets the standard and the prestressed tensioning and grouting are completed, remove the connecting bolts, tensioned threaded steel, adjusting struts, etc. between the movable bottom formwork and other components, and temporarily fix the first movable bottom formwork under the fixed-end formwork;

[0032] S204: Demoulding of the side formwork

[0033] After the movable bottom formwork is demoulded, remove the side-bottom formwork and end formwork fixtures, the formwork around the anchor tooth block, etc., operate the hydraulic system to separate the side formwork from the beam body, and then contract the cylinder to complete the demoulding;

[0034] S205: Demoulding of the fixed bottom formwork

[0035] Successively and alternately jog the vertical jacks under the fixed bottom formwork to release the mechanical lock. First, contract 9 jacks, and then contract the vertical jacks at the 4 fulcrums of the frame to complete demoulding;

[0036] S206: Demoulding of the fixed end formwork

[0037] Check the installation of the beam moving jacks and mark the dimensions. Operate the jacks to translate the beam segment, observe the separation of the fixed end formwork from the beam body, and translate again to complete demoulding.

[0038] Working principle: Before the device waits for pouring, it is necessary to apply oil to the spliced formwork to facilitate subsequent demoulding. At this time, the motor can be started to drive the gear shaft to rotate continuously. When the gear shaft rotates, it will move synchronously on the front surface of the end formwork. At the same time, through the fixedly connected hydraulic rod, the oiling roller above will be driven to move along the side formwork, fixed bottom formwork, and movable bottom formwork. At the same time, during the movement, the oil pump arranged outside the upper oil storage tank will transport the demoulding oil to the connection bin through the oil supply pipe. The demoulding oil entering the connection bin will enter the oiling roller along the connecting frame and one-way bearing. Under the influence of centrifugal force during the rotation of the oiling roller, its pressure is greater than the pressure of the hard valve membrane inside the oiling roller and flows out, and is coated on the surfaces of each formwork along with the movement of the oiling roller. When the oiling rollers on both sides move to the center of the movable bottom formwork, it is necessary to start the motor to reverse. At this time, the gear shaft rotates in the reverse direction and drives the oiling roller to move in the reverse direction. At this time, due to the one-way rotation limit of the one-way bearing, the oiling roller cannot rotate, so it can level the demoulding oil coated on the surfaces of each formwork through its bottom surface. At this time, through 2 - 3 times of the above process, the oiling treatment of the formwork surface can be conveniently completed without manually applying oil to the surfaces of each formwork. At the same time, for different oiling requirements, any number of baffle plates can be inserted into the connecting frame and fixed with bolts to block the surface of the oiling roller, so as to avoid excessive throwing out of the demoulding oil and further control its oil output. In addition, during the rotation or movement of the oiling roller, the swing rod rotatably connected to the outside of its inner rod will swing accordingly, and due to the elastic force of the volute spring and the continuously moving demoulding oil, it will swing. At this time, because the oiling roller is in a vibrating state where it cannot rotate or a rotating state where it can rotate, it can stir the demoulding oil stored inside to prevent it from precipitating inside the oiling roller and further promoting the oiling effect.

[0039] The present invention provides a precast segment beam formwork system for concrete box girders and its construction method. It has the following beneficial effects:

[0040] 1. The present invention prefabricates by means of the end mold, side mold, auxiliary mold, movable bottom mold, walking slide shoes, jacks, steel reinforcement cages, and side mold frames, adopts the short-line matching method, and is combined with a template system and a reasonable layout of hydraulic jacks to achieve precise mold adjustment, support, and demolding. This not only improves the prefabrication accuracy of segmental beams, ensures the splicing quality of bridges, but also optimizes the construction process. Each process is closely connected, reducing construction time, improving construction efficiency, and being able to adapt to different segment types and sizes. At the same time, the disassembly and assembly of the 400T matching beam adjustment system are facilitated through designs such as integrated quick plugs, overall enhancing the construction convenience and adaptability, and reducing the comprehensive cost.

[0041] 2. The present invention, through the provided oil storage tank, winding rack, oil supply pipe, hydraulic rod, motor, gear shaft, baffle plate, connecting frame, and connecting chamber, can, when applying oil to the template, drive the gear shaft to rotate through the motor, and utilize the centrifugal force of the oil application roller to throw out the release oil and evenly coat it on the surface of the template, achieving automatic oil application. In addition, by adjusting the number and position of the baffle plates, the oil output of the oil application roller can be further controlled to meet different oil application requirements.

[0042] 3. The present invention, through the provided one-way bearing, oil application roller, limit protrusions, insertion rod, inner rod, swing rod, and rotating block, can, when the oil application roller moves to the center of the movable bottom mold, reverse the motor, and the oil application roller stops rotating due to the one-way rotation limit of the one-way bearing, and use its bottom surface to level the release oil on the surface of the template, ensuring uniform oil application and saving release oil. At the same time, the vibration state of the swing rod during the movement of the oil application roller helps to stir the release oil stored inside, prevent precipitation, and improve the oil application effect. Description of the Drawings

[0043] Figure 1 It is a three-dimensional view of the installation state of each template of the present invention;

[0044] Figure 2 It is a schematic diagram of the insertion state of the steel reinforcement cage of the present invention;

[0045] Figure 3 It is a schematic diagram of the oil supply adjustment device of the present invention;

[0046] Figure 4 It is a schematic diagram of the hydraulic rod part of the present invention;

[0047] Figure 5 It is a schematic sectional view of the auxiliary oil application device of the present invention;

[0048] Figure 6 It is a schematic diagram of the one-way bearing part of the present invention;

[0049] Figure 7 It is a schematic diagram of the cross-section of the inner rod of the present invention;

[0050] Figure 8Schematic diagram of the cross-section of the rotating block of the present invention;

[0051] Figure 9 Schematic diagram of the cross-section of the connecting bin of the present invention;

[0052] Figure 10 Schematic diagram of the contact between the tooth shaft and the side mold of the present invention;

[0053] Figure 11 Schematic diagram of the cross-section of the winding frame of the present invention;

[0054] Figure 12 Flow chart of the construction method of a formwork system for precast segmental beams of a concrete box girder of the present invention;

[0055] Figure 13 Schematic diagram of the demolding process of the S2 segment beam of the present invention.

[0056] Among them, 1. Connecting beam frame; 2. Oil supply regulating device; 3. Auxiliary oil coating device; 4. Fence; 5. End mold; 6. Side mold; 7. Fixed bottom mold; 8. Movable bottom mold; 9. Walking slider; 10. Jack; 11. Steel reinforcement cage; 12. Side mold frame; 201. Oil storage tank; 202. Winding frame; 203. Oil supply pipe; 204. Hydraulic rod; 205. Motor; 206. Tooth shaft; 207. Baffle; 208. Connecting frame; 209. Connecting bin; 301. One-way bearing; 302. Oil coating roller; 303. Limit protrusion; 304. Insert rod; 305. Inner rod; 306. Swing rod; 307. Rotating block. Detailed implementation manners

[0057] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the specification of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0058] Embodiment:

[0059] Please refer to the attached Figure 1 - attached Figure 2, an embodiment of the present invention provides a formwork system for precast segments of a concrete box girder, including a connecting beam frame 1 and a fence 4. The upper surface of the connecting beam frame 1 is fixedly connected with a fence 4 to ensure the construction safety of construction workers. The front surface of the connecting beam frame 1 is detachably installed with an end form 5. The lower part of the front surface of the connecting beam frame 1 is fixedly connected with a side formwork frame 12. The upper surface of the side formwork frame 12 is detachably installed with a side form 6. The lower part of the side form 6 is detachably installed with a fixed bottom form 7. One end of the fixed bottom form 7 away from the side form 6 is detachably connected with a movable bottom form 8. Jacks 10 are fixedly connected to the lower surfaces of the side form 6, the fixed bottom form 7, and the movable bottom form 8. The upper surfaces of the fixed bottom form 7, the movable bottom form 8, and the side form 6 are all 11 + 1 stainless steel composite panels. A walking sliding shoe 9 is arranged below the jack 10 at the lower part of the fixed bottom form 7. A steel reinforcement cage 11 is inserted into the inner surface of the end form 5. Oil supply regulating devices 2 are arranged on both the left and right sides of the connecting beam frame 1. The oil supply regulating device 2 includes an auxiliary oiling device 3.

[0060] Branch platforms extend forward from both the left and right sides of the connecting beam frame 1, facilitating construction workers to construct on the platform surface. Through holes are provided on the inner surface of the connecting beam frame 1 according to the shape of the bridge, and through holes are also provided on the inner surface of the end form 5 according to the shape of the bridge. The through holes inside the connecting beam frame 1 and the end form 5 here are both used to accommodate the insertion of the steel reinforcement cage 11, so that the concrete after pouring can form a preset shape inside the bridge. Two groups of side forms 6, side formwork frames 12, and fixed bottom forms 7 are provided and are symmetrically distributed with the central axis of the end form 5 as the axis of symmetry. The side form 6, the fixed bottom form 7, and the movable bottom form 8 are in close contact with each other, thus ensuring the sealing between them and preventing leakage during the concrete pouring process. Wind nozzle side formworks are arranged on the outer sides of the side forms 6 on both the left and right sides. The jack 10 at the lower part of the fixed bottom form 7 is slidably connected with the walking sliding shoe 9. The inside of the steel reinforcement cage 11 is supported by steel bar connections.

[0061] Please refer to the appendix Figures 3 - 4 and Figures 9 - 11, the oil supply regulating device 2 includes an oil storage tank 201. A fuel supply pipe 203 is connected to the lower part of the oil storage tank 201. A winding frame 202 is wound around the outer surface of the fuel supply pipe 203. The middle part of the fuel supply pipe 203 passes through the central roller of the winding frame 202 and is connected to the oil storage tank 201 and the connection chamber 209 on both sides respectively. Therefore, when the fuel supply pipe 203 is released, both ends will extend synchronously, and when the fuel supply pipe 203 is stored, both ends will be retracted synchronously. One end of the fuel supply pipe 203 away from the oil storage tank 201 is connected to the connection chamber 209. A gear shaft 206 is engaged with the front surface of the side mold 6. One end of the gear shaft 206 away from the end mold 5 is fixedly connected to a motor 205. Power generation devices are arranged at the extending ends on the left and right sides of the connecting beam frame 1 and are connected to the motor 205 through long wires during the use of the motor 205 to ensure that it can operate normally and drive the gear shaft 206 to rotate. A hydraulic rod 204 is fixedly connected to the outer surface of the motor 205 through a connecting member. The hydraulic rod 204 used here is an electric hydraulic rod, which is also connected to the generators at the extending sections on the left and right sides of the connecting beam frame 1 through long wires. Therefore, the hydraulic pressure can be maintained during the movement of the motor 205. The upper part of the hydraulic rod 204 is fixedly connected to the connection chamber 209. A connection frame 208 is fixedly connected to the outer arc surface of the connection chamber 209. A shielding plate 207 is fixedly connected to the inner surface of the connection frame 208 through bolts.

[0062] The lower surface of the oil storage tank 201 is fixedly connected to the connecting beam frame 1. The oil storage tank 201 can be filled with release agent oil on the ground and then lifted by a crane and transported to the connecting beam frame 1. An oil pump is arranged at the connection between the oil storage tank 201 and the fuel supply pipe 203. Through the operation of the oil pump, the release agent oil inside the oil storage tank 201 can be continuously and smoothly discharged. The roller at the center of the winding frame 202 is rotatable and is internally provided with a volute spring. Therefore, during the reverse rotation of the motor 205, the released fuel supply pipe 203 is stored outside the winding frame 202. A toothed groove is formed on the front surface of the end mold 5 and is engaged with the gear shaft 206. Therefore, during the operation of the motor 205, the gear shaft 206 can provide a stable force through the engagement with the end mold 5 to ensure the stable operation of the oil application roller 302. Multiple rectangular slots are formed on the outer arc surface of the connection frame 208, so that the shielding plate 207 can be inserted. Positioning bolts equal in number to the rectangular slots are threadedly connected to the front surface of the connection frame 208. Therefore, the position of the shielding plate 207 is fixed after it is inserted. The inner arc surface of the shielding plate 207 is in close contact with the oil application roller 302. Therefore, when it is located outside the oil application roller 302, it can block the through holes at the corresponding angles on its outer side. The upper part of the shielding plate 207 is arc-shaped. A threaded through hole is formed in the lower part of the shielding plate 207. The arc degrees of the upper arc-shaped areas of multiple shielding plates 207 are the same and evenly divide the outer circumferential arc surface of the oil application roller 302. An L-shaped through hole is formed inside the connection chamber 209, so that it can be connected to the one-way bearing 301 and the connection frame 208.

[0063] Please refer to the appendixFigure 5 - Attachment Figure 8 , the auxiliary oiling device 3 includes a one-way bearing 301. The inner surface of the one-way bearing 301 is fixedly connected to the connecting frame 208. A plug rod 304 is fixedly connected to the outer surface of the one-way bearing 301. The outer surface of the one-way bearing 301 is fixedly connected to an oiling roller 302. One end of the plug rod 304 away from the one-way bearing 301 is fixedly connected to an inner rod 305. A rotating block 307 is rotatably connected to the outer arc surface of the inner rod 305. Two sets of symmetrically arranged limiting protrusions 303 are provided at both the front and rear ends of the rotating block 307. A swing rod 306 is fixedly connected to the lower part of the outer arc surface of the rotating block 307.

[0064] A plurality of through holes are provided on the outer arc surface of the oiling roller 302. Therefore, during its rotation, the release oil inside can be thrown out by centrifugal force. At the same time, when it does not rotate, due to the limitation of the hard valve, the release oil inside cannot flow out. A hard valve is provided in each set of internal through holes of the oiling roller 302. Through holes are provided at the centers of the inner surfaces of the one-way bearing 301 and the connecting frame 208. The centers of the one-way bearing 301, the connecting frame 208, and the connecting bin 209 are connected and communicated. A rectangular protrusion is provided on the outer arc surface of the inner rod 305 near the rotating block 307. Therefore, the rotation angle of the rotating block 307 can be limited through the rectangular protrusion, so that a relative movement is generated between it and the release oil driven by the oiling roller 302. A circular groove is provided at the center of the inner surface of the rotating block 307. The inner surface of the rotating block 307 is elastically connected to the inner rod 305 through a scroll spring. This scroll spring can keep the swing rod 306 located at the center of the two limiting protrusions 303 outside the rotating block 307 when no external force is applied.

[0065] Please refer to Attachment Figure 12 - Attachment Figure 13 , a construction method for a precast segment beam formwork system of a concrete box girder, includes the following processes:

[0066] S1: Formwork installation process

[0067] The fixed bottom form 7, the side form 6, and the jack 10 of the matching beam adjustment hydraulic system are initially installed and positioned according to their respective independent control requirements. The vertical, horizontal, and longitudinal cylinders are retracted to the specified dimensions. The beam moving hydraulic system installs cylinders according to the reaction points and arranges the pump station to complete the formwork installation;

[0068] S2: Segment beam demoulding process

[0069] After the concrete is poured and cured to reach the strength, the movable end form and the inner form are removed in sequence; after the prestressed tensioning and grouting are completed, the connecting components of the movable bottom form 8 are removed; then the relevant components of the side form 6 are removed and the hydraulic system is operated for demoulding; then the mechanical lock of the jack of the fixed bottom form 7 is released and the cylinder is retracted for demoulding; finally, the beam moving jack 10 is operated to translate the beam segment to complete the demoulding of the fixed end form;

[0070] S3: Beam Moving Process

[0071] After the fixed end formwork is demoulded, check the detachment of the beam body from the formwork; set the traction reaction seat and cross beam, and drive the sliding shoe to move forward by jacking with a hydraulic cylinder; synchronously operate the cylinders on both sides of the slideway to control the longitudinal movement of the beam segment, observe the scale marks to adjust and correct the deviation, and determine the moving distance according to the length of the next beam segment;

[0072] S4: Matching Beam Adjusting Process

[0073] Move the beam segment to the matching pedestal area and remove the relevant components; arrange new components on the pouring pedestal, install shear keys, overflow grooves and adjust the formwork; install connecting bolts and tensioned precision rolled threaded steel, and hoist the steel bar cage; jack up the matching beam adjusting jack 10 and move the matching beam segment back; measure and mark the central axis, and finely adjust the attitude; lower the matching beam to fit the bank side end face, and adjust the floor elevation and slope to complete the matching;

[0074] S5: Support Conversion Pedestal System Conversion Process

[0075] After the matching beam adjusting is completed and the concrete of the poured beam segment is cured, move the beam to separate the matching beam from the poured beam segment; remove the relevant components of the matching pedestal, and move the beam to the support conversion pedestal; install new components in the area of the movable bottom formwork 8 of the pouring pedestal, and set up the formwork; connect to the jack control system, jack out the jack 10 and put in the beam moving sliding shoe, and place the beam body; remove the relevant components of the support conversion pedestal and transfer them to the pouring pedestal.

[0076] 10. A construction method for a precast segment beam formwork system of a concrete box girder according to claim 1, characterized in that in the S2 segment beam demoulding process, the following steps are included:

[0077] S201: Demoulding of the Movable End Formwork

[0078] After the concrete is cured to reach the strength, remove the movable end formwork in blocks; let the matching beam end face descend by 2 - 3 mm against the three-way jack 10 to separate, and then use the beam moving hydraulic jack to move and demould;

[0079] S202: Removal of the Inner Formwork

[0080] After the end formwork 5 is removed and the concrete strength of the beam segment meets the standard, remove the inner formwork of the inner bin, the manhole formwork and the matching angle steel;

[0081] S203: Demoulding of the Movable Bottom Formwork

[0082] After the concrete strength meets the standard and the prestress tensioning and grouting are completed, remove the connecting bolts, tensioned threaded steel, adjusting struts, etc. connecting the movable bottom formwork 8 to other components, and temporarily fix the first piece of the movable bottom formwork 8 under the fixed end formwork;

[0083] S204: Demoulding of the Side Formwork

[0084] After the movable bottom formwork 8 is removed from the formwork, remove the side-bottom formwork and end formwork fixtures, the wooden formwork around the anchor tooth block, etc. Operate the hydraulic system to separate the side formwork 6 from the beam body, and then retract the oil cylinder to complete the formwork removal;

[0085] S205: Demoulding of the fixed bottom formwork

[0086] Sequentially and alternately jog the vertical jacks 10 of the fixed bottom formwork 7 to release the mechanical lock. First, retract 9 jacks 10, and then retract the 4 vertical jacks 10 at the fulcrums of the frame to complete the formwork removal;

[0087] S206: Demoulding of the fixed end formwork

[0088] Check the installation of the beam moving jacks 10 and mark the dimensions. Operate the jacks 10 to translate the beam segment, observe the separation of the fixed end formwork from the beam body, and translate again to complete the formwork removal.

[0089] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A concrete box girder prefabricated segmental beam formwork system, comprising a connecting beam frame (1) and a fence (4), characterized in that: The upper surface of the connecting beam frame (1) is fixedly connected to a fence (4); the front surface of the connecting beam frame (1) is detachably mounted with an end mold (5); the lower part of the front surface of the connecting beam frame (1) is fixedly connected to a side mold frame (12); the upper surface of the side mold frame (12) is detachably mounted with a side mold (6); the lower part of the side mold (6) is detachably mounted with a fixed bottom mold (7); the end of the fixed bottom mold (7) away from the side mold (6) is detachably connected to a movable bottom mold (8); the lower surfaces of the side mold (6), the fixed bottom mold (7) and the movable bottom mold (8) are all fixedly connected to jacks (10); a walking shoe (9) is provided below the lower jack (10) of the fixed bottom mold (7); the inner surface of the end mold (5) is plugged with a steel cage (11); the left and right sides of the connecting beam frame (1) are both provided with oil supply regulating devices (2); the oil supply regulating device (2) contains an auxiliary oiling device (3).

2. A concrete box girder precast segmental beam formwork system according to claim 1, characterized in that: The left and right sides of the connecting beam frame (1) are provided with branch platforms extending forward, the inner surface of the connecting beam frame (1) is provided with through holes according to the shape of the bridge, the inner surface of the end mold (5) is provided with through holes according to the shape of the bridge, the side mold (6), the side mold frame (12), and the fixed bottom mold (7) are each provided with two groups, and are symmetrically distributed with the central axis of the end mold (5) as the symmetry axis, the side mold (6), the fixed bottom mold (7), and the movable bottom mold (8) are in close contact with each other, the left and right sides of the side mold (6) are both provided with wind nozzle side molds on the outside, the lower jack (10) of the fixed bottom mold (7) is slidably connected to the walking shoe (9), and the inside of the steel cage (11) is connected and supported by steel bars.

3. A concrete box girder precast segmental beam formwork system according to claim 1, characterized in that: The oil supply regulating device (2) comprises an oil storage tank (201), the lower part of the oil storage tank (201) is connected to an oil supply pipe (203), the outer surface of the oil supply pipe (203) is wound with a winding frame (202), the end of the oil supply pipe (203) away from the oil storage tank (201) is connected to a connecting bin (209), the front surface of the side mold (6) is meshed with a gear shaft (206), the end of the gear shaft (206) away from the end mold (5) is fixedly connected to a motor (205), the outer surface of the motor (205) is fixedly connected to a hydraulic rod (204) through a connecting piece, the upper part of the hydraulic rod (204) is fixedly connected to a connecting bin (209), the outer arc surface of the connecting bin (209) is fixedly connected to a connecting frame (208), and the inner surface of the connecting frame (208) is fixedly connected to a shielding plate (207) through bolts.

4. A concrete box girder precast segmental beam formwork system according to claim 1, characterized in that: The auxiliary oiling device (3) comprises a one-way bearing (301), the inner surface of the one-way bearing (301) is fixedly connected to the connecting frame (208), the outer surface of the one-way bearing (301) is fixedly connected to an insertion rod (304), the outer surface of the one-way bearing (301) is fixedly connected to an oiling roller (302), one end of the insertion rod (304) away from the one-way bearing (301) is fixedly connected to an inner rod (305), the outer arc surface of the inner rod (305) is rotatably connected to a rotating block (307), the front and rear ends of the rotating block (307) are both provided with two groups of symmetrical limiting protrusions (303), and the lower part of the outer arc surface of the rotating block (307) is fixedly connected to a swing rod (306).

5. A concrete box girder precast segmental beam formwork system according to claim 3, characterized in that: The lower surface of the oil storage tank (201) is fixedly connected to the connecting beam frame (1); an oil pump is provided at the connection between the oil storage tank (201) and the oil supply pipe (203); a roller at the center of the winding frame (202) is rotatable; a tooth-shaped groove is provided on the front surface of the end mold (5) and meshes with the gear shaft (206); a plurality of groups of rectangular slots are provided on the outer arc surface of the connecting frame (208); and positioning bolts having the same number as the rectangular slots are threadedly connected to the front surface of the connecting frame (208).

6. A concrete box girder precast segmental beam formwork system according to claim 3, characterized in that: The inner arc surface of the baffle plate (207) is in close contact with the oil coating roller (302), the upper part of the baffle plate (207) is arranged to be arc-shaped, and the lower part of the baffle plate (207) is provided with a threaded through hole, and the arc areas of the upper parts of the plurality of groups of baffle plates (207) have the same arc angle and evenly divide the outer arc surface of the oil coating roller (302), and an L-shaped through hole is provided inside the connecting bin (209).

7. A concrete box girder precast segmental beam formwork system according to claim 4, characterized in that: The outer arc surface of the oil coating roller (302) is provided with a plurality of through holes, and each group of internal through holes of the oil coating roller (302) is provided with a hard valve. The inner surfaces of the one-way bearing (301) and the connecting frame (208) are provided with through holes at the center, and the one-way bearing (301), the connecting frame (208) and the connecting bin (209) are connected at the center.

8. A concrete box girder precast segmental beam formwork system according to claim 4, characterized in that: A rectangular protrusion is provided on the outer arc surface of the inner rod (305) near the rotating block (307), a circular ring groove is provided at the center of the inner surface of the rotating block (307), and the inner surface of the rotating block (307) is elastically connected to the inner rod (305) via a spiral spring.

9. A method for constructing a concrete box beam prefabricated segmental beam formwork system, characterized in that: Using the concrete box girder prefabricated segmental beam formwork system described in claim 1, The following steps are involved: S1: Template installation process The fixed bottom formwork (7), the side formwork (6), and the jack (10) of the matching beam adjustment hydraulic system are initially installed and positioned according to their own independent control requirements, the vertical, horizontal, and longitudinal cylinders are retracted to the specified size, the beam shifting hydraulic system installs the cylinders according to the reaction points and arranges the pump station to complete the template installation; S2: Segmental beam demoulding process After the concrete pouring and curing reaches the strength, the movable end mold and the inner mold are removed in sequence; after the prestressing tensioning and grouting are completed, the movable bottom mold (8) connecting parts are removed; then the side mold (6) related parts are removed and the hydraulic system is operated to demould; then the mechanical lock of the fixed bottom mold (7) jack is released and the oil cylinder is retracted to demould; finally, the beam shifting jack (10) is operated to translate the beam section to complete the demoulding of the fixed end mold; S3: Beam moving process After the fixed end mold is demoulded, check the separation of the beam body and the template; set the traction reaction seat and the crossbeam, and drive the sliding shoe forward by pushing the hydraulic cylinder; the cylinders on both sides of the slideway are synchronously operated to control the longitudinal movement of the beam section, observe the scale mark to adjust the deviation, and determine the moving distance according to the length of the lower beam section; S4: Matching beam adjustment process Move the beam section to the matching pedestal area and remove related components; arrange new components on the casting pedestal, install shear keys and overflow grooves, and adjust the template; install connecting bolts and pull-to-pull fine-rolled threaded steel bars, and hoist the steel bar skeleton; lift the matching beam adjustment jack (10) and move the matching beam section back; measure and mark the center axis and fine-tune the posture; lower the matching beam to fit the bank side end face, and adjust the bottom plate elevation and slope to complete the matching; S5: Pivot conversion pedestal system conversion process After the matching and adjusting beams are completed and the concrete of the cast beam section is poured and cured, the beam is moved to separate the matching beam from the cast beam section; the relevant parts of the matching pedestal are removed, and the beam is moved to the fulcrum conversion pedestal; new parts are installed in the movable bottom mold (8) area of ​​the casting pedestal, and the mold is erected; the jack control system is connected, the jack (10) is ejected, the beam moving sliding shoe is inserted, and the beam body is placed; the relevant parts of the fulcrum conversion pedestal are removed, and the beam is transferred to the casting pedestal.

10. A method for constructing a concrete box girder prefabricated segmental beam formwork system according to claim 9, characterized in that: The demoulding process of the S2 segment beam includes the following steps: S201: demoulding of movable end mold After the concrete pouring and curing reaches the required strength, the movable end molds are removed in blocks; the end faces of the matching beams are lowered 2-3 mm by a three-way jack (10) and then demoulded by horizontal displacement hydraulic jacks; S202: Inner mold removal After the end formwork (5) is removed and the concrete strength of the beam section reaches the standard, the inner warehouse wooden formwork, manhole formwork and matching angle steel are removed; S203: Dismantling the movable bottom mold After the concrete strength reaches the standard and the prestressing tensioning and grouting are completed, the movable bottom form (8) is removed from the bolts connecting the other parts, the tensioning threaded steel bars, the adjusting struts, etc., and the first movable bottom form (8) under the fixed end form is temporarily fixed; S204: Side mold demoulding After the movable bottom mold (8) is demoulded, the side bottom mold and the end mold fixture, the wooden mold around the anchor tooth block, etc. are removed, and the hydraulic system is operated to separate the side mold (6) from the beam body, and then the oil cylinder is retracted to complete the demoulding; S205: Fixed bottom mold demoulding Alternately move the vertical jacks (10) under the fixed bottom mold (7) to release the mechanical lock, first retract the 9 jacks (10), and then retract the 4 vertical jacks (10) at the frame to complete demoulding; S206: Fixed end mold demoulding Check the installation of the beam shifting jack (10) and mark the size, operate the jack (10) to shift the beam section horizontally, observe the separation of the fixed end mold from the beam body, and shift it horizontally again to complete the demoulding.

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