Construction method of small-radius curve bridge

Abstract

The application discloses a small-radius curve bridge erecting construction method, and belongs to the technical field of bridge construction. The small-radius curve bridge erecting construction method comprises the following steps: adjusting an erecting machine; and dividing a bridge into five spans between a No.0 bench and a No.5 bench, and erecting the five spans in the following sequence: the fifth span, the fourth span, moving the erecting machine, the first span, the second span and the third span. The small-radius curve bridge erecting construction method can improve the erecting machine to adapt to the actual construction environment, and complete the construction of the bridge in a specific sequence under the premise of ensuring the stability and safety of the construction, thereby reducing the construction difficulty, improving the construction efficiency and the reliability of the construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge construction technology, in particular to a small-radius curve bridge construction method. BACKGROUND

[0002] Prestressed concrete box girder is one of the commonly used structural forms in the field of bridge construction. It is a rectangular box girder composed of concrete, with the characteristic of applying prestress during construction. Prestressed concrete box girder has good durability and long-term performance, and can withstand the load and deformation of the bridge during use. However, the prestressed concrete box girder has large volume, heavy weight, difficult transportation and installation, especially in small-radius curve, which has always been a great challenge in bridge engineering.

[0003] When the prestressed concrete box girder is erected on a small-radius curve, the front leg track must be on the bent cap, and the middle leg track must be parallel to the bent cap at the front leg. This will cause the guide beam after the middle leg to be suspended outside the bridge and unable to achieve beam feeding, and the guide beam and the required beam plate direction have an angle, which cannot be placed in place. Therefore, the existing bridge erector and its construction method cannot complete the construction of small-radius curve bridge. SUMMARY

[0004] The purpose of the present application is to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a small-radius curve bridge construction method, which can adjust the bridge erector to complete the construction of small-radius curve bridge.

[0005] According to the small-radius curve bridge construction method of the present application, it comprises:

[0006] Step 1: install the beam plate using a double guide beam bridge erector, first adjust the bridge erector, add a flange plate with freedom and a rotating shaft to the middle leg, shorten the length of the longitudinal guide beam, lengthen the horizontal moving track of the front leg and the middle leg, and reinforce the horizontal connection of the guide beam to ensure the stability of rotation;

[0007] Step 2: before formal erection, divide the bridge into 5 spans between No. 0 platform and No. 5 platform, mark the plane of the No. 4 and No. 5 span bent caps and bridge deck on the D-turn roadbed in proportion with lime, then install the bridge erector, after the bridge erector is erected, simulate the beam feeding and erection process of the No. 4 span, summarize the beam feeding route and erection technology and parameters, and mark the best route simulated on the actual roadbed and bridge deck with lime;

[0008] Step 3: The bridge erecting machine is assembled on the D ramp bridge No. 5 station, with a length of 50 m, and a piece of beam is used as a counterweight to cross the 5th span, after crossing, the front and middle support legs are fixed, and the two trolleys are moved forward to the erecting span, the crane is used to remove the last 10 m truss of the bridge erecting machine, the position of the bridge erecting machine is checked before erection, the beam is fed according to the marked route on the roadbed, the front trolley lifts one end of the beam, and the other end is placed on the beam carrier, the bridge erecting machine and the beam carrier cooperate to feed the beam, the rear trolley lifts the other end of the beam, and the two trolleys are synchronized to feed the beam, and after the two trolleys are moved forward to the position, they are simultaneously moved transversely to the accurate position of the beam slab installation, the limiting device is set on the track, the support leg pulley cannot extend out of the track during transverse movement, the beam is prepared to be lowered, and attention is paid to the beam body on the upper part of the support by about 10 cm, one end is lowered first, and then the other end, before the beam is lowered, the steel wire rope at one end of the beam slab is tightened to ensure the accuracy of the beam lowering;

[0009] Step 4: After the erection of the 5th span box girder is completed, the transverse diaphragm and the wet joint reinforcement are welded in time to enhance the integrity and stability, the bridge erecting machine crosses the span, and the fifth span wet joint is poured after the bridge erecting machine crosses the span;

[0010] Step 5: After the bridge erecting machine crosses the span, the front, middle and rear support legs are ensured to be safe and effective, and then the 4th span box girder is erected, before erection, the lime is marked on the 5th span deck according to the simulated optimal beam carrying roadbed, and the beam is fed and erected according to the route, after the beam slab is completed, the transverse diaphragm reinforcement is welded in time;

[0011] Step 6: The bridge erecting machine is transferred to No. 0 station and assembled, during the crossing of the bridge erecting machine, the middle support leg is set behind the No. 0 station back wall from the back position of the station, and then the 1st and 2nd span box girders are erected;

[0012] Step 7: The rear support and the rear support leg are supported, the middle support leg is moved to the 2nd span beam end large pile No. and the angle is adjusted, then the height of the front support leg is adjusted, after all the preparation procedures are completed, the crossing is performed, after the crossing, the front support leg is placed at a distance of 1 m from the center line of the bent cap of the 4th span beam to avoid the outer beam from being unable to be lowered into position during erection, the 2nd span wet joint is poured, and after the strength meets the requirements, the 3rd span box girder is erected, and the feeding route is marked on the deck with lime before erection.

[0013] According to the small-radius curve bridge erecting construction method, at least the following beneficial effects are achieved: by using the small-radius curve bridge erecting construction method to construct the small-radius curve bridge, the bridge can be constructed in a specific order by improving the bridge erecting machine to adapt to the actual construction environment, while ensuring the stability and safety of the construction. The construction difficulty is reduced, the construction efficiency and reliability are improved.

[0014] According to some embodiments of the present application, each span of the box girder comprises three girders, the two side girders are erected first, then the middle girder is erected, and after the erection of the three girders is completed, the diaphragm and the wet joint reinforcement need to be welded in time.

[0015] According to some embodiments of the present application, when each girder is in place, square timbers are arranged at both ends as temporary supports, so that the girder body is kept vertical and stable, and the overturning displacement is prevented.

[0016] According to some embodiments of the present application, before the bridge girder erection machine passes through the span, the angle of the front support leg is adjusted, the middle support leg is moved from the position of the back of the machine to the girder surface of the fifth span, and the distance from the small pile number girder end is about 50 cm, and the angle is adjusted to be parallel to the center line of the cap girder of the third pier, the middle support leg and the rear support are fixed with the longitudinal guide beam, the rear trolley is moved, one girder is transported to the rear of the bridge girder erection machine by using the girder transport trolley, the girder is connected with the rear trolley, the weight of the girder body is used as counterweight to prevent the bridge girder erection machine from overturning when passing through the span.

[0017] According to some embodiments of the present application, after the bridge girder erection machine completes the erection of the second span girder, the diaphragm reinforcement welding and the local welding of the wet joint reinforcement are completed in time.

[0018] According to some embodiments of the present application, in step 3, after the girder body is transported to the position under the bridge girder erection machine by the girder transport trolley, the front end of the girder is lifted by the first lifting trolley at the front of the bridge girder erection machine, the rear end is supported on the girder transport trolley, and the girder body is placed on the front and rear cross beams of the bridge girder erection machine, and the bridge girder erection machine is ready for overall transverse movement. At this time, the front support leg is suspended, and the middle and rear support legs support.

[0019] According to some embodiments of the present application, in step 3, when the bridge girder erection machine and the small box girder are transversely moved to the position to be placed, the front support leg is appropriately jacked up to eliminate the deflection of the girder when it is cantilevered, and the front support leg is supported.

[0020] According to some embodiments of the present application, in step 3, after the girder body is longitudinally moved to the position on the bridge girder erection machine, the longitudinal and transverse fine adjustments are made, the rubber support or the temporary support is adjusted, and the girder is placed in position. During the process of lowering the precast girder, the position and the perpendicularity of the girder body are checked. If the position of the girder is accurate and the diaphragm is reinforced by the wooden pad and is stable, the lifting hanger can be completely loosened. During the process of loosening the hanger, the center of gravity and the stability of the girder body are observed in time. At this time, the front, middle and rear support legs all support.

[0021] According to some embodiments of the present application, in step 3, when the girder is placed, it must be carefully checked whether the placement is correct. If the placement deviates, the position should be adjusted by lifting again to ensure that the adjusted position coincides with the center line of the support, the girder end line and the girder side line drawn on the cap girder with ink before erection. If the support and the girder bottom or the girder bottom leveling steel plate are not tightly attached, thin steel plates should be added to adjust them to be tightly attached, and the phenomenon of void should not occur.

[0022] According to some embodiments of the application, in step 3, after the first piece of beam is positioned and reinforced, the front support leg is retracted and moved back to the beam transporting path position with the aid of the jack, and the second piece of beam is prepared to be installed, and the above steps are repeated to install the third piece of beam, and then the bridge erecting machine is moved to the next hole position in the longitudinal direction.

[0023] According to some embodiments of the application, in step 3, the deflection of the front support leg cantilever is monitored in real time when the bridge erecting machine is moved longitudinally, so as to avoid the deflection of the front support leg cantilever exceeding the normal value, and the lifting trolley at the rear high support leg is fixed to the main beam.

[0024] According to some embodiments of the application, the steel bars of the cross partition plate between the two pieces of beam are welded in time for each span, so as to ensure the stability of the box beam; and the wet joint concrete between the beams is poured in time after the installation of the precast beam for each span is completed.

[0025] Additional aspects and advantages of the application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0026] The application will be further described below with reference to the drawings and embodiments:

[0027] Figure 1 Figure 5 is a structural schematic diagram of the bridge erecting machine over-span assembled at No. 5 station in step 3;

[0028] Figure 2 Figure 6 is a structural schematic diagram of the structure after the over-span is completed in step 3;

[0029] Figure 3 Figure 7 is a structural schematic diagram of the structure after the last section of truss of the bridge erecting machine is removed in step 3;

[0030] Figure 4 Figure 8 is a structural schematic diagram of the structure of the beam feeding in step 3;

[0031] Figure 5 Figure 9 is a structural schematic diagram of the structure after the erection of the fifth span box beam is completed;

[0032] Figure 6 Figure 10 is a structural schematic diagram of the structure after the erection of the fourth span box beam is completed;

[0033] Figure 7 Figure 11 is a structural schematic diagram of the structure after the erection of the first and second span box beams is completed;

[0034] Figure 8 Figure 12 is a structural schematic diagram of the structure after the erection of the third span box beam is completed;

[0035] Figure 9 Figure 13 is a structural schematic diagram of the beam erection sequence for each span box beam.

[0036] Reference signs:

[0037] 1st span 100; 2nd span 200; 3rd span 300; 4th span 400; 5th span 500;

[0038] 1st span box girder 110; 2nd span box girder 210; 3rd span box girder 310; 4th span box girder 410; 5th span box girder 510;

[0039] Bridge erecting machine 600; beam 700; timber 800;

[0040] Beam feeding direction A. DETAILED DESCRIPTION

[0041] This part will describe the specific embodiments of the present application in detail, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0042] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0043] In the description of the present application, several meanings are one or more, and the meaning of multiple is more than two, greater than, less than, more than, etc. are not included in the number, and above, below, etc. are understood to include the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0044] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood broadly, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0045] Reference Figures 1 to 9 The present application describes a small-radius curve bridge erecting construction method according to an embodiment of the present application.

[0046] As Figures 1 to 9 shown, the small-radius curve bridge erecting construction method according to an embodiment of the present application comprises:

[0047] Step 1: install the beam and slab by using the double-beam bridge erecting machine 600, adjust the erecting machine 600, add a flange with a degree of freedom and a rotating shaft to the middle support leg, shorten the length of the longitudinal guide beam, lengthen the transverse rails of the front support leg and the middle support leg, and reinforce the transverse connection of the guide beam to ensure the stability of rotation;

[0048] Step 2: before the formal erection, divide the bridge into 5 spans between the 0th platform and the 5th platform, mark the plane of the deck and the bent cap of the 4th span and the 5th span on the D ramp roadbed in proportion to the plane size of the bridge by using lime, then install the erecting machine 600, after the erecting machine 600 is erected, simulate the feeding and erecting process of the 4th span 400, summarize the feeding route and the erecting technology and parameters, and mark the optimal route simulated on the actual roadbed and the bridge deck by using lime;

[0049] Step 3: the erecting machine 600 is assembled at the 5th platform of the D ramp bridge with a length of 50 m, a piece of beam is used as a counterweight to cross the 5th span 500, after crossing, the front support leg and the middle support leg are fixed, the two cranes are moved forward to the erected span, the crane is used to remove the last 10 m truss of the erecting machine 600 in sequence, the position of the erecting machine 600 is checked before erection, the feeding is performed along the feeding direction A according to the route marked on the roadbed, when feeding, the front crane lifts one end of the beam, the other end is placed on the beam carrier, the erecting machine 600 and the beam carrier cooperate to feed the beam, the rear crane lifts the other end of the beam, the two cranes walk synchronously to feed the beam, after the two cranes walk to the position, they are moved transversely to the accurate position of the beam and slab installation at the same time, the limiting device is set on the rail, when transversely moving, the support leg pulley cannot stretch out of the rail of the bent cap, the beam is prepared to be lowered, when lowering the beam, the beam body is about 10 cm above the support, one end is lowered first, then the other end, before lowering the beam, the steel wire rope at one end of the beam is tightened to ensure the accuracy of lowering the beam;

[0050] Step 4: after the 5th span box girder 510 is erected, the transverse diaphragm and the wet joint reinforcement are welded in time to enhance the integrity and stability, the erecting machine 600 crosses, after the erecting machine 600 crosses, the wet joint of the 5th span 500 is poured;

[0051] Step 5: after the erecting machine 600 crosses, after ensuring that the front support leg, the middle support leg and the rear support leg are safely and effectively supported, the 4th span box girder 410 is erected, before erection, the optimal beam carrier roadbed is marked on the 5th span 500 bridge deck according to the simulation, the beam is fed and erected according to the route, after the beam is installed, the transverse diaphragm reinforcement is welded in time;

[0052] Step 6: the erecting machine 600 is transferred to the 0th platform and assembled, when the erecting machine 600 crosses, the middle support leg is set behind the back wall of the 0th platform from the back of the platform, then the 1st span box girder 110 and the 2nd span box girder 210 are erected;

[0053] Step 7: After supporting the rear support and rear leg, the middle leg is moved to the large pile at the beam end of the second span 200, and the angle is adjusted, then the front leg is adjusted in height, after all the preparation procedures are completed, the over-span is performed, after the over-span, the front leg is placed at the position 1m away from the center line of the capping beam in the fourth span 400, so as to avoid the situation that the outer beam cannot be placed in place when the outer beam is erected, the wet joint of the second span 200 is poured, and after the strength meets the requirements, the third span box girder 310 is erected, and the lime is used to mark the feeding beam route on the bridge deck before erection.

[0054] The small-radius curve bridge erection construction method of the application is described below with a specific construction example:

[0055] The small-radius part of the D-loop ramp bridge of the Lianling Interchange is erected and fed by the ordinary bridge erector 600, and the feeding beam cannot be fed. The minimum radius of the bridge is 150m, the bridge intersection angle is 90 degrees, the right deviation angle of the front side line of the abutment back wall and the center line of the pier and the road design line is 90 degrees, and the abutment back wall line is parallel to the beam end, and the bridge span is the curve length on the road design line.

[0056] A WJQ40m / 150t double-guide-beam bridge erector 600 is used to adjust the beam plate installation, and two 80T gantry cranes are used to hoist the beam in the field and hoist it to the tire-type beam transport vehicle for transportation. The bridge is divided into five spans between the 0th abutment and the 5th abutment, and the erection sequence is: the 5th span 500, the 4th span 400, the movable bridge erector 600, the 1st span 100, the 2nd span 200, and the 3rd span 300.

[0057] First, the bridge erection is adjusted, the middle leg is provided with a certain degree of flange and rotating shaft; the length of the longitudinal guide beam is adjusted from 50m to 40m; the horizontal moving track of the front leg and the middle leg is lengthened; and the horizontal connection of the guide beam is reinforced to ensure the stability of rotation.

[0058] Before formal erection, the plane of the 4th and 5th span capping beams and the bridge deck is marked on the D-loop roadbed in proportion according to the bridge plane size, then the bridge erector 600 is installed, the feeding beam and beam erection process of the 4th span 400 are simulated, the best feeding beam route, erection technology and parameters are summarized, and the best simulated route is marked on the actual roadbed and bridge deck with lime.

[0059] (1) The bridge erecting machine 600 is assembled on the D ramp interchange No. 5 pier, with a length of 50 m, and a piece of beam is used as counterweight to cross to the 5th span 500. After crossing, the front and middle support legs are fixed, and the two trolleys are moved forward to the erection span. A 25 t crane is used to remove the last 10 m truss of the bridge erecting machine 600, and the position of the bridge erecting machine 600 is checked before erection. The beam is fed according to the marked route on the roadbed. When feeding the beam, the front trolley lifts one end of the beam, and the other end is placed on the beam carrier. The bridge erecting machine 600 and the beam carrier cooperate to feed the beam. Then the rear trolley lifts the other end of the beam, and the two trolleys walk synchronously to feed the beam.

[0060] After the two trolleys walk to the position, they are simultaneously transversely moved to the accurate position of the beam slab installation. The limiting device is set on the track. When transversely moving, the support leg pulley cannot extend out of the track of the cover beam. The beam is prepared to be dropped. When dropping the beam, attention is paid to the beam body on the upper part of the support by about 10 cm. One end is dropped first, and then the other end. Before dropping the beam, the steel wire rope at one end of the beam slab is tightened to ensure the accuracy of the beam drop. The erection process is shown in FIG. 1 to FIG. 3. Figure 5

[0061] (2) After the 5th span 500 is erected, the transverse diaphragm and the wet joint steel bars (3 m apart) are welded in time to enhance the overall performance and stability. The bridge erecting machine 600 crosses, and the wet joint of the 5th span 500 is poured after the bridge erecting machine 600 crosses.

[0062] (3) Before the bridge erecting machine 600 crosses, the angle of the front support leg is adjusted, the middle support leg is moved from the pier back position to the beam surface of the 5th span 500, which is about 50 cm from the small pier No. beam end, and attention is paid to adjust the angle to be parallel to the center line of the cover beam of No. 3 pier. The middle support leg, the rear support and the longitudinal guide beam are fixed, the two trolleys are moved backward, a piece of beam is transported to the bridge erecting machine 600 by the beam carrier, the beam is connected with the rear trolley, the weight of the beam body is used as counterweight to prevent the bridge erecting machine 600 from tilting forward during crossing.

[0063] (4) After the bridge erecting machine 600 crosses, the support safety and effectiveness of each support point (front support leg, middle support leg, rear support leg) are ensured, and then the 4th span box girder 410 is erected. Before erection, the optimal beam transportation roadbed is simulated and marked on the 5th span 500 bridge surface with lime. The beam is fed and erected according to the route. The specific process is similar to that of (1) and will not be repeated. After the beam slab is completed, the transverse diaphragm steel bars are welded in time.

[0064] (5) The bridge erecting machine 600 is moved to No. 0 pier and assembled (the longitudinal guide beam is 50 m long). When the bridge erecting machine 600 crosses, the middle support leg is set behind the No. 0 pier back wall from the pier back position, and then the 1st span box girder 110 and the 2nd span box girder 210 are erected. The erection method and process are the same as those of (1), (2), (3) and (4).

[0065] ​(6) After the bridge girder 600 completes the erection of the second span 200, the steel reinforcement of the diaphragm and the partial welding of the steel reinforcement of the wet joint are timely completed. The rear support and the rear leg are supported, the middle leg is moved to the large pile number at the end of the second span 200 beam, and the angle is adjusted. Then the height of the front leg is adjusted. After all the preparation procedures are completed, the over-span is performed. After the over-span, the front leg is placed at the position 1 m away from the center line of the bent cap of the fourth span 400 beam surface to avoid the outer beam erection. The second span 200 wet joint is poured, and after the strength meets the requirements, the third span box girder 310 is erected. Before erection, lime is used to mark the beam feeding route on the bridge deck. The specific method and process are the same as those of the first point.

[0066] As shown in Figure 9 each span of the box girder includes three girders 700. When erecting the girders, the side girders are erected first, and then the middle girder is erected. After the erection of the three girders 700 is completed, the steel reinforcement of the diaphragm and the wet joint needs to be welded in time. When each girder 700 is in place, square timbers 800 are arranged at both ends as temporary supports to keep the beam body vertical and stable and prevent overturning displacement.

[0067] When erecting each span, the beam car transports the beam body under the bridge girder 600, the front end of the beam is lifted by the first lifting trolley at the front of the bridge girder 600, and the rear end is supported on the beam transport flat car. Continue to move forward. When the rear end of the beam to be erected reaches the position of the second lifting trolley at the rear of the bridge girder 600, the rear end of the beam is lifted by the second lifting trolley. The two lifting trolleys transport the beam in front and rear movement, and place the beam body on the front and rear cross beams of the bridge girder 600. The bridge girder 600 is ready for overall transverse movement. At this time, the front leg is suspended, and the middle and rear legs are supported.

[0068] When the overall transverse movement of the bridge girder 600 and the small box girder reaches the position to be placed, the front leg is appropriately jacked up to eliminate the deflection when the girder is cantilevered, and the front leg is well supported.

[0069] After the beam body is longitudinally moved to the position on the bridge girder 600, it is longitudinally and transversely adjusted, the rubber support or the temporary support is adjusted, and the beam is placed in position. During the process of lowering the precast beam, the position and perpendicularity of the beam body are checked. If the position of the beam is accurate and the diaphragm is stabilized by adding wood under the diaphragm, the lifting hanger can be completely loosened. During the process of loosening the hanger, the center of gravity and stability of the beam body are observed at any time. At this time, the front, middle and rear legs are all supported.

[0070] When the beam is placed, it must be carefully checked whether it is correctly placed. If the position deviates, the position should be adjusted by lifting again to ensure that the adjusted position coincides with the center line of the support, the beam end line and the beam side line marked on the bent cap with ink before erection; if the support and the beam bottom or the beam bottom leveling steel plate are not tightly attached, thin steel plates should be added to adjust them to be tightly attached, and void phenomenon should not occur.

[0071] After the first piece of beam is positioned and the reinforcement is completed, the front support leg is retracted and the beam is moved back to the beam transporting path with the aid of the jack, and the second piece of beam is prepared to be connected. After the third piece of beam is installed by repeating the above steps, the bridge erecting machine 600 is moved to the next hole position in the longitudinal direction, and the cycle is repeated.

[0072] Before moving in the longitudinal direction, the operating personnel need to be arranged to perform their duties and positions, and should not be distracted. When moving the bridge erecting machine 600 in the longitudinal direction, the deflection of the front support leg cantilever should not exceed the normal value. The hoist trolley at the rear top support leg should be fixed to the main beam to prevent it from sliding forward and causing the bridge erecting machine 600 to overturn. After the bridge erecting machine 600 is moved to the next hole position, the support work is completed, and non-working personnel are prohibited from walking on the bridge erecting machine 600. During non-working hours, the bridge erecting machine 600 is first cleaned of debris to prevent any objects from falling into the track, and a dedicated person is assigned to guard the bridge erecting machine 600, the emergency brake is closed, the power is cut off, the walking system triangular pad is supported, and the front support cable wind rope is pulled tight, so that the bridge erecting machine 600 is in a state of being safe and sound. The steel bars of the cross partition plate between the two pieces of beam should be welded in time to ensure the stability of the box girder. After the installation of each span of precast beam is completed, the wet joint concrete between the beams is poured in time.

[0073] In summary, by using the small-radius curve bridge erecting construction method to construct the small-radius curve bridge, the bridge can be constructed in a specific order by improving the bridge erecting machine 600 to adapt to the actual construction environment, while ensuring the stability and safety of the construction. The construction difficulty is reduced, the construction efficiency and reliability are improved.

[0074] The above describes the embodiments of the present application in detail in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A method for erecting a small-radius curve bridge, characterized in that, Comprise: Step 1: the beam plate installation is carried out by using the double guide beam bridge girder erection machine, the bridge girder erection machine is adjusted first, the flange plate and rotating shaft with the degree of freedom are added to the middle support leg, the length of the longitudinal guide beam is shortened, the transverse rail of the front support leg and the middle support leg is lengthened, the transverse connection of the guide beam is reinforced, and the stability of rotation is ensured; Step 2: before formal erection, the bridge is divided into 5 spans between the 0th platform and the 5th platform, the plane of the 4th span and the 5th span of the deck is marked on the D ramp roadbed in proportion by using lime, then the bridge girder erection machine is installed, after the bridge girder erection machine is erected, the feeding beam route and the erection process and parameters are summarized by simulating the feeding beam and beam erection process of the fourth span, and the optimal route simulated is marked on the actual roadbed and bridge deck by using lime; Step 3: the bridge girder erection machine is assembled at the 5th platform of the D ramp bridge, the length is 50 m, a piece of beam is used as counterweight to cross to the 5th span, after crossing, the front support leg and the middle support leg are fixed, the two cranes are moved forward to the erection span, the crane is used to remove the last 10 m truss of the bridge girder erection machine in sequence, the position of the bridge girder erection machine is checked before erection, the beam is fed according to the route marked on the roadbed, when feeding the beam, the front crane lifts one end of the beam, the other end is placed on the beam carrier, the bridge girder erection machine and the beam carrier cooperate to feed the beam, the rear crane lifts the other end of the beam, the two cranes walk synchronously to feed the beam, after the two cranes walk to the position, they are moved transversely to the accurate position of the beam plate installation at the same time, the limiting device is arranged on the rail, when moving transversely, the support leg pulley cannot stretch out of the rail of the deck, the beam is prepared to be dropped, when the beam is dropped, attention is paid to the fact that the beam body is about 10 cm above the upper part of the support, one end is dropped first, then the other end, before the beam is dropped, the steel wire rope at one end of the beam plate is tightened to ensure the accuracy of the beam drop; Step 4: after the 5th span box girder is erected, the transverse diaphragm and the wet joint reinforcement are welded in time to enhance the integrity and stability, the bridge girder erection machine crosses, after the bridge girder erection machine crosses, the fifth span wet joint is poured; before the bridge girder erection machine crosses completely, the angle of the front support leg is adjusted, the middle support leg is moved from the platform back position to the 5th span beam surface, the distance is 50 cm from the small pile number beam end, and attention is paid to adjusting the angle to be parallel to the center line of the 3rd pier deck, the middle support leg, the rear support and the longitudinal guide beam are fixed, the two cranes are moved backward, a piece of beam is transported to the bridge girder erection machine by using the beam carrier, the beam is connected with the rear crane, the weight of the beam body is used as counterweight to prevent the bridge girder erection machine from overturning when crossing; Step 5: after the bridge girder erection machine crosses completely, the front support leg, the middle support leg and the rear support are ensured to be safe and effective, then the 4th span box girder is erected, the optimal beam transportation route on the fifth span bridge deck is marked by using lime before erection, the beam is fed and erected according to the route, after the beam plate is completed, the transverse diaphragm reinforcement is welded in time; Step 6: The bridge erecting machine is transferred to No. 0 platform and assembled, and during the overpass of the bridge erecting machine, the middle support leg is set behind the back wall of No. 0 platform from the back position of the platform, and then the first and second span box girders are erected; after the bridge erecting machine completes the erection of the second span girder, the reinforcement welding of the diaphragm and the partial welding reinforcement of the wet joint are timely completed; the rear support and the rear support leg are well supported, the middle support leg is moved to the large pile number at the end of the second span girder, and the angle is well adjusted, and then the front support leg is adjusted in height, all the preparation procedures are completed, and then the overpass is performed; after the overpass, the front support leg is placed at a distance of 1 m from the center line of the bent cap on the fourth span girder surface; the second span wet joint is poured, and after the strength meets the requirements, the third span box girder is erected; Step 7: The rear support and the rear support leg are well supported, the middle support leg is moved to the large pile number at the end of the second span girder, and the angle is well adjusted, and then the front support leg is adjusted in height, all the preparation procedures are completed, and then the overpass is performed; after the overpass, the front support leg is placed at a distance of 1 m from the center line of the bent cap on the fourth span girder surface to avoid the inability to fall into place when erecting the outer side girder, the second span wet joint is poured, and after the strength meets the requirements, the third span is erected, and the front is marked with lime on the bridge deck to mark the feeding beam route.

2. The small-radius curve bridge construction method according to claim 1, characterized by, Each span of the box girder includes three girders, and when the girders are erected, the two side girders are erected first, and then the middle girder is erected; after the erection of the three girders is completed, the diaphragm and the wet joint reinforcement need to be welded in time.

3. The small-radius curve bridge construction method according to claim 2, characterized by, When each girder is in place, square timbers are set at both ends as temporary supports to keep the girder body vertical and stable and prevent overturning displacement.

4. The small-radius curve bridge construction method according to claim 2, wherein In step 3, after the beam body is transported to the lower part of the bridge erecting machine by the beam transport car, the front end of the beam is lifted by the first hoisting trolley at the front part of the bridge erecting machine, and the rear end is supported on the beam transport car, and then the beam is continuously moved forward; when the rear end of the beam to be erected reaches the position of the second hoisting trolley at the rear part of the bridge erecting machine, the rear end of the beam is lifted by the second hoisting trolley, and the two hoisting trolleys transport the beam body forward and backward to place the beam body on the front and rear cross beams of the bridge erecting machine, and the bridge erecting machine is ready for overall horizontal movement; at this time, the front support leg is suspended, and the middle and rear support legs are supported.

5. The small-radius curve bridge construction method according to claim 4, wherein In step 3, when the overall horizontal movement of the bridge erecting machine and the small box girder reaches the position to be placed, the front support leg is appropriately jacked up to eliminate the deflection when the girder is suspended, and the front support leg is well supported.

6. The small-radius curve bridge construction method according to claim 5, wherein In step 3, after the beam body is longitudinally moved to the position on the bridge erecting machine, it is longitudinally and horizontally adjusted, the rubber support or the temporary support is adjusted, the beam is placed in position, and during the lowering of the precast beam, the position and perpendicularity of the beam body are checked; if the position of the beam is accurate and the diaphragm is stabilized by the wooden pad under the diaphragm, the lifting hanger can be completely released; during the release of the hanger, the center of gravity and stability of the beam body are observed at any time; at this time, the front, middle, and rear support legs are all supported.

7. The small-radius curve bridge construction method according to claim 6, wherein In step 3, when the beam is placed, it must be carefully checked whether it is correctly placed; if the position deviates, it should be re-lifted and adjusted to ensure that the adjusted position coincides with the center line of the support on the bent cap, the beam end line, and the beam side line marked by the ink line before erection; if the support and the beam bottom or the beam bottom leveling steel plate are not tightly attached, thin steel plates should be added to adjust them to be tightly attached, and no void phenomenon should occur.

8. The small-radius curve bridge construction method according to claim 7, wherein In step 3, after the first piece of beam is positioned and the reinforcement is completed, the front support leg is retracted and the beam is moved back to the beam transporting path position with the aid of the jack, and the second piece of beam is prepared to be installed. The above steps are repeated to install the third piece of beam, and then the bridge erecting machine is moved to the next hole position in the longitudinal direction.

9. The small-radius curve bridge construction method according to claim 8, wherein In step 3, the deflection of the front support leg cantilever is monitored in real time when the bridge erecting machine is moved longitudinally, so as to avoid the deflection of the front support leg cantilever exceeding the normal value, and the lifting trolley at the rear high support leg is fixed to the main beam.

10. The small-radius curve bridge construction method according to claim 8, wherein The steel bars of the transverse partition plate between the two pieces of beam are welded in time for each span to ensure the stability of the box girder; and the wet joint concrete between the beams is poured in time after the installation of the precast beam of each span is completed.

Images