A construction method for erecting large-tonnage box beams on a small-radius curved ramp

Abstract

The present invention discloses a method for erecting a large-tonnage box girder on a small-radius curved slope, comprising: S1: preparation for a through-hole on a curved section of a bridge erecting machine; S2: adjustment of the attitude of the bridge erecting machine; the third column being offset outward by a maximum offset P; the arm of the first column of the bridge erecting machine being offset m1 inward of the curve; and the crossbeam of the first column being shifted by a pillow beam being offset n1 inward of the curve; S3: support of the first column; S4: adjustment of the height of the entire machine; S5: adjustment of the position of the first column; S6: feeding the beam; S7: adjustment of the position of the dropped beam; and S8: alignment of the dropped beam. The present invention has the following beneficial effects: a transverse oil cylinder capable of fine-tuning the first column is provided at the bottom of the first column of the bridge erecting machine, and the attitude of the bridge erecting machine being adjusted so that the bridge erecting machine can be adjusted in a posture closest to the curve. The boom can enter the curved section with the least offset of the first column, thereby reducing the number of adjustments of the bridge erecting machine, improving the positioning accuracy of the bridge erecting machine on the bridge pier on the curved section, and reducing the difficulty of erecting bridges on small curved slopes.

Description

Technical Field

[0001] The invention relates to the field of bridge construction, in particular to a method for erecting a large-tonnage box girder on a small-radius curved ramp. Background Art

[0002] Bridges are key nodes and hub projects for the interconnection of transportation facilities. With the rapid development of the national economy, there will be heavy railway bridge construction tasks, especially in the central and western regions, where the working conditions are extremely complex. For example, the single-track box girder (weighing more than 500 tons) within the section is located within a bridge group, and there are special girder erection conditions such as small curves below 400m, 30‰ large slopes, underpasses, proximity to existing railways, new main lines and multiple connecting lines crossing each other. These special girder erection conditions need to be strictly carried out within the established construction schedule within the construction period. Existing bridge erection machines are mostly suitable for erecting large-tonnage box girders under large curve conditions. In the existing curved bridge construction, the construction of large-radius curved bridges (curvature radius greater than 600m) can be met by the existing bridge construction method. However, for the erection of small-radius curved ramp beams (curvature radius less than 400m), the bridge erection machine needs to be specially modified and repeatedly moved longitudinally and transversely to adjust its position so that the front and rear legs of the bridge erection machine can be put into place, barely meeting the beam erection requirements. However, the operation is too cumbersome and has high safety risks. It is particularly dependent on the professional experience and operating level of the construction workers. For areas with complex working conditions, the construction is more difficult. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a method for erecting large-tonnage box girders on small-radius curved ramps, which can meet the requirements of erecting small-radius curved ramps with a length of less than 400m and large ramps with a length of 30‰, thereby reducing the difficulty of construction.

[0004] The object of the present invention is achieved through the following technical solution: a construction method for erecting a large-tonnage box girder on a small-radius curved ramp, comprising the following steps:

[0005] S1. Preparation for the curved section of the bridge erection machine: After the box girder of the previous hole is lowered, the curved section is ready for the hole. The bridge erection machine column No. 3 is flipped up, and the girder transport vehicle returns. The stroke of the bridge erection machine column No. 1 is M, the stroke of the bridge erection machine column No. 2 is L, and the stroke of the bottom transverse bolster of the bridge erection machine column No. 1 is N. At this time, the center lines of the bridge erection machine columns No. 1, No. 2, and No. 3 are all aligned with the center line of the bridge deck, and the center line of the bridge deck is also aligned with the center line of the pier;

[0006] S2. Bridge erection machine attitude offset adjustment: the bridge erection machine boom moves forward, and at the same time, the front and rear two crane beams on the boom return to the tail of the boom to act as counterweights, and then the bridge erection machine attitude offset adjustment is performed as close to the curve as possible. The arm of the second column continues to offset to the outside of the curve, with an offset of ≤L / 2. The offset of the arm of the second column drives the third column to offset outward with a maximum offset P. The arm of the first column of the bridge erection machine offsets to the inside of the curve by m1, m1≤M / 2, and at the same time, the crossbeam of the first column moves horizontally, and the pillow beam offsets to the inside of the curve by n1, n1≤N. At this time, the first column The center of the No. 1 column is close to the center of the pier to be erected in the next hole with an offset of m1+n1 and an adjustment margin is reserved for the offset of the subsequent No. 1 column. After the posture of the bridge erection machine is adjusted, the No. 3 column is supported on the pier of the erected box beam. After the support of the No. 3 column is completed, the No. 2 column is folded up and moved forward to the next hole beam erection position and supported on the center of the erected box beam. The No. 1 column is folded up and moved forward to the pier to be erected in the next hole. At this time, the No. 1 column is suspended in the air and not supported. The center of the No. 1 column's bolster, the transverse bolster, the pier to be erected and the No. 1 column's arm do not coincide.

[0007] S3, support of column No. 1: determine the offset adjustment amount of the center line of column No. 1 according to the offset between column No. 1 and the center of the pier to be erected in the next hole, and the offset adjustment amount does not exceed the reserved adjustment margin. The column No. 1 and the transverse bolster are offset by m2, m2≤M. After the bolster of column No. 1 is transversely moved into place, that is, the bolster coincides with the center of the pier to be erected, the transverse bolster is further transversely moved by n2 and a margin is reserved for the final positioning of the transverse bolster. At this time, the transverse center does not coincide with the center of the pier to be erected and the center of the arm of column No. 1, n2≤N and n1+n2≤N, and a steel bolster is placed inside the pedestal of the pier to be erected to support column No. 1;

[0008] S4. Adjust the height of the whole machine: according to the slope requirements, raise the whole machine, move the two crane beams on the boom forward to the rear end of the No. 1 column to act as counterweight, retract the No. 3 column and flip it up, and move the boom forward;

[0009] S5. Adjust the position of column No. 1: Column No. 1 is offset by n3 through the transverse bolster, where n3 ≤ N and n3 does not exceed the final positioning margin of the transverse bolster. At this point, the bolster of column No. 1, the transverse bolster, and the center of the pier to be erected coincide. Simultaneously, the arm of column No. 1 is laterally shifted m3 until the arm coincides with the center of column No. 1, and the curved section of the bridge erection machine is completed.

[0010] S6, beam feeding: the front and rear beam transport vehicles feed the beams into place, the two beam cranes return to the beam lifting position, the front beam crane installs the boom to lift the front end of the box beam, the front beam crane moves forward with the beam, and the rear beam transport vehicle moves forward synchronously. When the lifting hole at the rear end of the box beam reaches below the rear beam crane, the vehicle stops, anti-slip blocks are set on the downhill direction of the beam transport vehicle, and the rear beam transport vehicle sets the outriggers;

[0011] S7, beam drop position adjustment: The third column flips down and falls onto the beam transport vehicle and stands upright. At the same time, the rear beam crane is installed with a boom to lift the rear end of the box beam. The arm of the second column shifts toward the curve and drives the third column to shift until the center of the rear beam crane on the boom coincides with the center of the lifting point of the box beam to be lifted.

[0012] S8. Alignment and lowering of beams: After the two beam cranes have moved to their proper positions, they stop lowering when they are 100-300mm above the pier top pad stone. The No.3 column is flipped up, and the beam transport vehicle withdraws and returns to the beam yard to install beams. After the beam transport vehicle withdraws, the arm of the No.2 column is offset to the outside of the curve until the center of the box beam coincides with the center of the pier to be erected. The beams are then aligned and lowered, and the erection of the box beam is completed.

[0013] The maximum offset P of the third column is the maximum displacement that the third column can support on the web of the box beam when the center of the third column coincides with the center of the box beam and after the third column is offset.

[0014] The stroke M of the arm of the No. 1 column is smaller than the stroke N of the transverse bolster, and the stroke M of the arm of the No. 1 column of the bridge erection machine is smaller than the stroke L of the arm of the No. 2 column of the bridge erection machine.

[0015] The No. 1 column of the bridge erection machine is provided with an upper driving device for adjusting the position of the No. 1 column machine arm and the bridge erection machine boom, and a lower driving device for adjusting the position of the No. 1 column pillow beam and the transverse pillow beam.

[0016] The upper driving device includes a driving oil cylinder installed on the boom, and the movement of the driving oil cylinder drives the position adjustment of the No. 1 column machine arm on the boom of the bridge erecting machine.

[0017] The lower driving device includes a bolster arranged on the bolster used to support the No. 1 column, and a transverse bolster fixed to the bottom of the No. 1 column and slidably installed on the bolster. A driving cylinder for driving the transverse bolster is provided between the bolster and the transverse bolster. The fixed end of the driving cylinder is installed on the bolster, and the action end of the driving cylinder is connected to the transverse bolster.

[0018] The first column, the second column and the third column are all provided with telescopic joints, and the height requirements of the first column, the second column and the third column during installation can be met by adjusting the telescopic joints.

[0019] In the step S2 of adjusting the attitude offset of the bridge-building machine, the center line of the third column does not coincide with the center line of the erected box girder.

[0020] The offset at the center of column No. 1 is a dynamic adjustment offset, with a maximum offset of M / 2 + N. The maximum offset P of column No. 3 is a static adjustment offset. It should be noted that the dynamic adjustment offset is adjusted based on actual conditions, and the adjustment amount for each box girder is not necessarily the same. This application uses the maximum offset P of column No. 3 as a quantitative measure to achieve the closest curve posture adjustment.

[0021] The curve radius of the curved section does not exceed 400 meters and the slope in the curved section is not less than 30‰. The bridge-building machine is adjusted with a posture offset closest to the curve, which means that in step S2, the straight line where the bridge-building machine's main arm is located is tangent to the curved section with the maximum slope to reduce the adjustment amount of the bridge-building machine's No. 1 column in subsequent steps.

[0022] Among them, it should be noted that there are many types of bridge-building machines. The important components of a bridge-building machine include: front and rear beam cranes, machine arms, front and rear suspensions, No. 1 column, No. 2 column, No. 3 column, power system, hydraulic and electrical control systems, and a transverse sleeper beam under No. 1 column. For details, see Table 1 Bridge-building Machine Parameters:

[0023] Table 1 Parameters of bridge erecting machine

[0024]

[0025]

[0026] The beam transport vehicle is a tire-type vehicle, consisting of two independent operating mechanisms: a driving vehicle and a driven vehicle. The driving vehicle comprises an engine, transmission system, travel system, braking system, hydraulic steering system, vehicle frame, and electrical system; the driven vehicle comprises a travel system, braking system, hydraulic steering system, vehicle frame, and other components. The driving vehicle is driven by the engine, while the driven vehicle is driven by forward friction and is equipped with a small engine to return on its own.

[0027] When passing through a curve, a transverse sleeper beam is installed under the No. 1 column to ensure that the No. 1 column does not exceed the pier when it moves horizontally, and a steel pad is placed on the outside of the pier pad. When the beam transport vehicle feeds the beam, the center line of the box beam is marked, and personnel are arranged to follow the main vehicle to observe the distance between the main vehicle tire and the ballast wall reinforcement at any time. The telescopic joint of the No. 1 column of the bridge crane can be adjusted to a height of 4.5m. It is also equipped with an adjustment section. When passing through the hole, the height of the No. 1 and No. 3 columns can be controlled by adjusting the telescopic joint to ensure the safety of the beam passing through the hole. At the same time, when the No. 3 column is erected, a steel pad is placed on the inside of the ballast wall under the No. 3 column sleeper beam to ensure construction safety.

[0028] After the columns are supported, the verticality of columns 1, 2, and 3 is adjusted. The verticality requirement for columns 1, 2, and 3 is ≤ 5‰. Because the bridge-erecting machine operation is performed by multiple personnel, additional protective measures are implemented to prevent misoperation and accidents. After the beam is erected and before the hole alignment begins, a steel wire rope is used to connect column 1 to the bridge deck reinforcement. This wire rope can only be released after the bridgehead of column 2 is in place. The wire rope is connected to the upper crossbeam or upper crossbeam of column 1.

[0029] When passing through a curve, the outrigger pads must be made of hard miscellaneous wood, and cracked, irregular, or other problematic wood must not be used. Before the No. 1 column reaches the abutment, the verticality of the No. 2 column should be closely observed to be ≤5‰, otherwise the single-action hanging should be corrected in time. After the No. 1 column is in place, the arm level should be adjusted to within the specified requirements. All motion mechanisms should be reliably synchronized, and operations should be stopped immediately if they are not synchronized. For working conditions with transverse slopes on the bridge deck, the height of the pads should be adjusted to maintain the level. If any abnormal noise is heard during the passing process, the operation should be stopped immediately for inspection. Passing operations are strictly prohibited when the wind speed is greater than level 5, and beams will not be erected at level 6.

[0030] Furthermore, when crossing a large ramp, the relative height difference of the bridge piers to be erected is calculated according to the design drawings before each crossing. When adjusting the first, second, and third columns of the bridge erection crane, surveyors are assigned to measure the adjusted boom to ensure that the first column is higher than the second and third columns. When transporting beams on large ramps, anti-slip sleepers are carried on the beam transporter and monitored by a dedicated person to prevent the vehicle from slipping due to brake failure.

[0031] The beneficial effects of the present invention are:

[0032] (1) A transverse oil cylinder is provided at the bottom of the No. 1 column of the bridge erection machine, which can realize the fine adjustment of the No. 1 column. In conjunction with the movement of the top of the No. 1 column, the travel range of the No. 1 column is further increased, meeting the requirements of erecting beams on a small-radius curve ramp when the curve radius does not exceed 400 meters and the slope of the curve section is not less than 30‰.

[0033] (2) The attitude offset of the bridge erection machine is adjusted so that the bridge erection machine can be adjusted in the attitude closest to the curve. The boom can enter the curve section with the least offset of the No. 1 column. After the adjustment, the boom moves again. This effectively reduces the adjustment amount of the center of the No. 1 column of the bridge erection machine in the subsequent steps. The No. 3 column takes the maximum offset P as the reference, and the center of the No. 1 column is close to the center of the next hole to be erected with an offset m1+n1 and an adjustment margin is reserved for the offset of the No. 1 column. The offset adjustment amount of the center line of the No. 1 column is determined according to the offset between the No. 1 column and the center of the next hole to be erected. The offset adjustment amount does not exceed The reserved adjustment margin, the No. 1 column together with the transverse pillow beam is offset by m2, and finally the pillow beam of the No. 1 column, the transverse pillow beam, the pier to be erected and the center of the No. 1 column arm are coincident. It can be seen that the present application first performs the maximum offset, and then completes the alignment by adjusting the No. 1 column up and down, wherein the upper part thereof is adjusted for a large distance, and the lower part thereof is adjusted for a small distance, so that it can be positioned on a line with a small curve radius, and at the same time, combined with the telescopic joint to meet the slope requirements, the number of adjustments of the bridge-building machine is reduced, the positioning accuracy of the bridge-building machine (No. 1 column) on the pier on the curved section is improved, and the difficulty of bridging with a small curve slope is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the process of the present invention;

[0035] Figure 2 This is a structural diagram of the bridge erection machine of the present invention before the through-hole preparation;

[0036] Figure 3 This is a side view of the bridge erection machine of the present invention before the hole is prepared;

[0037] Figure 4 A schematic diagram showing the position of the first column before the bridge erection machine through-hole preparation of the present invention;

[0038] Figure 5 A schematic diagram showing the position of the second column before preparing the through hole for the bridge erection machine of the present invention;

[0039] Figure 6 A schematic diagram showing the positions of the first three columns for preparing the through-hole for the bridge erection machine of the present invention;

[0040] Figure 7 This is a schematic diagram of the position of the bridge erecting machine's boom after it moves forward;

[0041] Figure 8 This is a schematic diagram of the position of the third column after the boom of the bridge erecting machine of the present invention moves forward;

[0042] Figure 9 A schematic diagram of the position of the bridge erection machine posture offset adjustment of the present invention;

[0043] Figure 10 This is a schematic diagram of the position of the first column after the attitude offset of the bridge erecting machine of the present invention is adjusted;

[0044] Figure 11 This is a schematic diagram of the position of the second column after the attitude offset of the bridge erection machine of the present invention is adjusted;

[0045] Figure 12 This is a schematic diagram of the position of the third column after the attitude offset of the bridge erecting machine of the present invention is adjusted;

[0046] Figure 13 This is a structural diagram of the second column being supported when the bridge erecting machine of the present invention passes through a hole;

[0047] Figure 14 This is a schematic diagram of the position of the first column when the bridge erection machine of the present invention passes through a hole;

[0048] Figure 15 Schematic diagram of adjusting the No. 1 column in the step of supporting the No. 1 column by the bridge erecting machine of the present invention;

[0049] Figure 16 This is a schematic diagram of the crane moving forward in the step of erecting the first column of the bridge erecting machine of the present invention;

[0050] Figure 17 Schematic diagram of the forward movement of the boom in the step of supporting the No. 1 column of the bridge erection machine of the present invention

[0051] Figure 18 This is a schematic diagram of the position of the first bridge column of the present invention being adjusted on the pier to be erected;

[0052] Figure 19 This is a schematic diagram of the position of the bridge No. 1 column after the No. 3 column is adjusted on the pier to be erected according to the present invention;

[0053] Figure 20 This is a schematic diagram of the position of the bridge No. 1 column after the No. 2 column is adjusted on the pier to be erected according to the present invention;

[0054] Figure 21 This is a schematic diagram of the position of the first bridge column of the present invention after the position of the first column is adjusted on the pier to be erected;

[0055] Figure 22 This is a schematic diagram of the positions of the bridge erecting machine and the beam transport vehicle during beam feeding according to the present invention;

[0056] Figure 23 This is a schematic diagram of adjusting the second column of the bridge erection machine during beam feeding according to the present invention;

[0057] Figure 24 This is a schematic diagram of the position of the third column after the second column of the bridge erection machine is adjusted during beam feeding according to the present invention;

[0058] Figure 25 This is a schematic diagram of the position of the second column of the bridge erecting machine after adjustment during beam feeding according to the present invention;

[0059] Figure 26 This is a schematic diagram of the position of the No. 1 column of the bridge erection machine after the No. 2 column is adjusted during beam feeding according to the present invention;

[0060] Figure 27 This is a schematic diagram of the positions of the bridge erecting machine and the beam transport vehicle when the beam transport vehicle of the present invention arrives at the beam hanging position;

[0061] Figure 28 This is a schematic diagram of the position of the third column when the beam transport vehicle of the present invention arrives at the beam hanging position;

[0062] Figure 29 This is a schematic diagram of the position of the beam when it is suspended according to the present invention;

[0063] Figure 30 This is a schematic diagram of adjusting the position of the third column when hanging the beam according to the present invention;

[0064] Figure 31 This is a schematic diagram of the position of the No. 2 column after the position of the No. 3 column is adjusted when the beam is hoisted according to the present invention;

[0065] Figure 32 This is a schematic diagram of the position of the No. 3 column after the position of the No. 3 column is adjusted when the beam is hoisted according to the present invention;

[0066] Figure 33 It is a schematic diagram of the present invention when the beam is dropped.

[0067] In the figure, 1-column No. 3, 2-column No. 2, 3-column No. 1, 4-big arm, 5-box girder, 6-pier, 7-beam crane, 8-transverse sleeper beam, 9-sleeper beam, 10-beam transport vehicle. DETAILED DESCRIPTION

[0068] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0069] like Figure 1-Figure 2 As shown, a method for erecting a large-tonnage box girder on a small-radius curved ramp comprises the following steps:

[0070] S1. Preparation for the curved section of the bridge erection machine: After the box girder of the previous hole is lowered, the curved section is ready for the hole. The bridge erection machine column No. 3 is flipped up, and the girder transport vehicle returns. The stroke of the bridge erection machine column No. 1 is M, the stroke of the bridge erection machine column No. 2 is L, and the stroke of the bottom transverse bolster of the bridge erection machine column No. 1 is N. At this time, the center lines of the bridge erection machine columns No. 1, No. 2, and No. 3 are all aligned with the center line of the bridge deck, and the center line of the bridge deck is also aligned with the center line of the pier;

[0071] S2. Bridge erection machine attitude offset adjustment: the bridge erection machine boom moves forward, and at the same time, the front and rear two crane beams on the boom return to the tail of the boom to act as counterweights, and then the bridge erection machine attitude offset adjustment is performed as close to the curve as possible. The arm of the second column continues to offset to the outside of the curve, with an offset of ≤L / 2. The offset of the arm of the second column drives the third column to offset outward with a maximum offset P. The arm of the first column of the bridge erection machine offsets to the inside of the curve by m1, m1≤M / 2, and at the same time, the crossbeam of the first column moves horizontally, and the pillow beam offsets to the inside of the curve by n1, n1≤N. At this time, the first column The center of the No. 1 column is close to the center of the pier to be erected in the next hole with an offset of m1+n1 and an adjustment margin is reserved for the offset of the subsequent No. 1 column. After the posture of the bridge erection machine is adjusted, the No. 3 column is supported on the pier of the erected box beam. After the support of the No. 3 column is completed, the No. 2 column is folded up and moved forward to the next hole beam erection position and supported on the center of the erected box beam. The No. 1 column is folded up and moved forward to the pier to be erected in the next hole. At this time, the No. 1 column is suspended in the air and not supported. The center of the No. 1 column's bolster, the transverse bolster, the pier to be erected and the No. 1 column's arm do not coincide.

[0072] S3, support of column No. 1: determine the offset adjustment amount of the center line of column No. 1 according to the offset between column No. 1 and the center of the pier to be erected in the next hole, and the offset adjustment amount does not exceed the reserved adjustment margin. The column No. 1 and the transverse bolster are offset by m2, m2≤M. After the bolster of column No. 1 is transversely moved into place, that is, the bolster coincides with the center of the pier to be erected, the transverse bolster is further transversely moved by n2 and a margin is reserved for the final positioning of the transverse bolster. At this time, the transverse center does not coincide with the center of the pier to be erected and the center of the arm of column No. 1, n2≤N and n1+n2≤N, and a steel bolster is placed inside the pedestal of the pier to be erected to support column No. 1;

[0073] S4. Adjust the height of the whole machine: according to the slope requirements, raise the whole machine, move the two crane beams on the boom forward to the rear end of the No. 1 column to act as counterweight, retract the No. 3 column and flip it up, and move the boom forward;

[0074] S5. Adjust the position of column No. 1: Column No. 1 is offset by n3 through the transverse bolster, where n3 ≤ N and n3 does not exceed the final positioning margin of the transverse bolster. At this point, the bolster of column No. 1, the transverse bolster, and the center of the pier to be erected coincide. Simultaneously, the arm of column No. 1 is laterally shifted m3 until the arm coincides with the center of column No. 1, and the curved section of the bridge erection machine is completed.

[0075] S6, beam feeding: the front and rear beam transport vehicles feed the beams into place, the two beam cranes return to the beam lifting position, the front beam crane installs the boom to lift the front end of the box beam, the front beam crane moves forward with the beam, and the rear beam transport vehicle moves forward synchronously. When the lifting hole at the rear end of the box beam reaches below the rear beam crane, the vehicle stops, anti-slip blocks are set on the downhill direction of the beam transport vehicle, and the rear beam transport vehicle sets the outriggers;

[0076] S7, beam drop position adjustment: The third column flips down and falls onto the beam transport vehicle and stands upright. At the same time, the rear beam crane is installed with a boom to lift the rear end of the box beam. The arm of the second column shifts toward the curve and drives the third column to shift until the center of the rear beam crane on the boom coincides with the center of the lifting point of the box beam to be lifted.

[0077] S8. Alignment and lowering of beams: After the two beam cranes have moved to their proper positions, they stop lowering when they are 100-300mm above the pier top pad stone. The No.3 column is flipped up, and the beam transport vehicle withdraws and returns to the beam yard to install beams. After the beam transport vehicle withdraws, the arm of the No.2 column is offset to the outside of the curve until the center of the box beam coincides with the center of the pier to be erected. The beams are then aligned and lowered, and the erection of the box beam is completed.

[0078] The maximum offset P of the third column is the maximum displacement that the third column can support on the web of the box beam when the center of the third column coincides with the center of the box beam and after the third column is offset.

[0079] The stroke M of the arm of the No. 1 column is smaller than the stroke N of the transverse bolster, and the stroke M of the arm of the No. 1 column of the bridge erection machine is smaller than the stroke L of the arm of the No. 2 column of the bridge erection machine.

[0080] The No. 1 column of the bridge erection machine is provided with an upper driving device for adjusting the position of the No. 1 column machine arm and the bridge erection machine boom, and a lower driving device for adjusting the position of the No. 1 column pillow beam and the transverse pillow beam.

[0081] The upper driving device includes a driving oil cylinder installed on the boom, and the movement of the driving oil cylinder drives the position adjustment of the No. 1 column machine arm on the boom of the bridge erecting machine.

[0082] The lower driving device includes a bolster 9 provided on the support of the No. 1 column, and a transverse bolster 8 fixed to the bottom of the No. 1 column and slidably installed on the bolster 9. A driving cylinder for driving the transverse bolster 8 is provided between the bolster 9 and the transverse bolster 8. The fixed end of the driving cylinder is installed on the bolster 9, and the action end of the driving cylinder is connected to the transverse bolster 8.

[0083] The first column, the second column and the third column are all provided with telescopic joints, and the height requirements of the first column, the second column and the third column during installation can be met by adjusting the telescopic joints.

[0084] In the step S2 of adjusting the attitude of the bridge-building machine, the center line of the third column does not coincide with the center line of the erected box girder.

[0085] The offset of the center of the No. 1 column is a dynamically adjusted offset, and its maximum offset is M / 2+N. The maximum offset P of the No. 3 column is a statically adjusted offset.

[0086] The curve radius of the curved section does not exceed 400 meters and the slope in the curved section is not less than 30‰. The bridge-building machine is adjusted with a posture offset closest to the curve, which means that in step S2, the straight line where the bridge-building machine's main arm is located is tangent to the curved section with the maximum slope to reduce the adjustment amount of the bridge-building machine's No. 1 column in subsequent steps.

[0087] Taking a bridge erection as an example, the bridge erection machine uses the mutual horizontal and vertical movement between the first, second and third columns and the machine arm to complete the bridge crane passing through the hole. The specific process is as follows:

[0088] 1. If Figure 2-6 As shown, after the upper box beam 5 is lowered, the beam transport vehicle returns to the beam yard. Column No. 3 1 is 7.15m away from the beam surface, and column No. 2 2 is 6.454m away from the beam surface. The front and rear ends of the boom 4 are on the same horizontal plane. At this time, column No. 1 3 is aligned with the center of the pier 6, and rubber pads + steel pads + hard miscellaneous wood pads are used under the legs. At the same time, column No. 1 3 is aligned with the boom; column No. 2 is aligned with the center line of the beam, and the boom of column No. 2 deviates 143mm to the outside of the curve; column No. 3 deviates 1995mm to the outside of the curve. 2. Figure 7-8As shown, the third column 1 is retracted, the boom 4 is moved forward 18m, and the two cranes 7 are retracted to the rear of the bridge crane. At this time, the third column 1 is deflected 346mm outside the curve. Figure 9-12 As shown, the arm of column No. 2 moves 607mm to the outside of the curve, and the arm deviates 750mm to the outside of the curve relative to column No. 2. The arm of column No. 1 moves 500mm to the inside of the curve (as shown by the arrow in the figure of the transverse movement direction). At the same time, column No. 1 3 moves 250mm to the inside of the curve together with the arm through the transverse oil cylinder of the transverse pillow beam 8. At this time, the arm of column No. 1 deviates 500mm to the inside of the curve relative to column No. 1 3. At the same time, column No. 1 3 deviates 500mm to the inside of the curve relative to the transverse pillow beam 8. The front end of the bridge crane arm 4 is 750mm outside the curve from the center of the next pier 6. The arm of column No. 3 deviates 1088mm to the outside of the curve relative to the center of the box beam 5. 4. Figure 13 As shown, support column 3 1, column 2 moved forward 33m to the next hole frame beam position for support. Column 2 retracted 3 pin holes 900mm and supported hardwood under the corbel 9 for leveling. Column 3 1 was 6.61m away from the beam surface, and column 2 was 5.504m away from the beam surface. At this time, the arm was 750mm inside the curve relative to column 2. Figure 14 As shown, column 3 moves forward 33m, passes through the lifting pin hole, and is supported on the next pier 6. At this time, column 2 is 5.504m away from the beam surface. The arm of column 1 is 7.152m away from the top surface of the pad stone. At this time, column 3 is suspended in the air and not supported. The arm is 750mm outward relative to pier 6, and column 3 is 1250mm outward relative to pier 6. Figure 15 As shown, column 3, together with the transverse bolster 8, moves 1000mm inward of the curve. The arm shifts 500mm inward relative to column 3 to 500mm outward. After column 3 is shifted into place, the transverse bolster 8 is shifted another 500mm inward of the curve, and two steel pads are placed inside the pad stone to support column 3. At this time, the arm of column 3 is 750mm outward of the curve relative to pier 6, and column 3 is 250mm outward of the curve relative to pier 6. Figure 16 As shown, the bridge has a span of 33m and a slope of 30‰. The height difference between the front and rear piers 6 is 990mm. After the whole machine is raised by 3 pin holes to 7.51m, the front and rear cranes 7 move forward 60m to the rear end of the No. 1 column 3 to act as a counterweight, and the boom 4 is ready to move forward. 8. Figure 17 As shown in the figure, the third column 1 is flipped up and the arm moves forward 15m. Figure 18-21 As shown, the first column 3 is moved 250mm to the inside of the curve by the transverse bolster 8. At this time, the bolster 9 of the first column, the transverse bolster 8 under the first column, and the center of the pier are vertical. At the same time, the arm of the first column is moved 500mm to the inside of the curve to coincide with the center of the first column 3, and the hole is completed. Figure 22-26As shown, the beam transport vehicle 10 feeds the beam into place, the beam hoisting crane 7 returns to the beam lifting position, and the front crane installs the boom to lift the front end of the box beam. The arm of the second column is offset 100mm to the outside of the curve. At this time, the center of the arm coincides with the center of the box beam to be lifted. The front beam hoisting crane boom is installed to lift the beam. At this time, the arm of the second column is 650mm inside the curve relative to the second column, and the arm of the third column is 633mm outside the curve relative to the center of the box beam. 11. Figures 27-28 As shown, the front beam crane and the rear beam transport vehicle move forward synchronously. The rear beam transport vehicle stops when the tire is 514mm away from the rear tire of the front beam transport vehicle, and the rear beam crane is ready to lift the beam. The front end of the rear beam transport vehicle tire is 392mm and 850mm away from the inner side of the ballast wall, and the rear end is 281mm and 965mm away. At this time, the center of the rear crane at the third column is 238mm outside the curve relative to the center of the box beam to be lifted. Figure 29-32 As shown, the third column 1 flips down, lands on the beam transport vehicle and stands upright, while the rear crane installs the boom to lift the rear end of the box beam. The third column's boom deflects 238mm to the inside of the curve, and the second column's boom deflects 157mm to the inside of the curve. At this time, the center of the rear crane at the third column coincides with the center of the lifting point of the box beam to be lifted. The second column's boom deflects 820mm to the inside of the curve relative to the second column. Figure 33 As shown, the front and rear beam cranes advance synchronously to the beam drop position, preparing for beam drop. Once in position, the front and rear beam cranes slowly lower to a position 200mm from the pier top pad. The second column is then lifted, and the beam transporter withdraws and returns to the beam yard for beam loading. The arm of the second column moves 950mm laterally toward the outside of the curve, allowing the beam to be lowered into position. During beam drop, the beam is paused at a point where the support anchor bolts on one end of the box girder (the higher pier end) are 20cm from the pad. The other end is lowered separately to a point where the support anchor bolts are 20cm from the pad. A plumb bob is used to align the support center with the cross line of the pad. The elevation, level, and slope of the box girder are adjusted using a bridge erection machine. Once adjusted, the beam is first positioned using jacks, each applying a preload of approximately 10t to eliminate gaps and deformation in the pads. The box girder's position is then verified. Once correct, the beam is lowered onto the jacks. Finally, the support grouting is performed, and the lifting equipment is removed. The box girder is lowered onto four jacks. The jacks are adjusted to ensure the girder is in place, ensuring that the reaction force at each support and the average of the four support reactions do not exceed ±5%. When the box girder is lowered onto the jacks, the jacks must support it smoothly, and the girder height and slope must meet design requirements. At this point, the No. 2 column boom is 143 mm outside the No. 2 main deflection curve, and the bridge is erected.

[0089] Among them, tire-type beam transporters are transport machines composed of two independent operating mechanisms: a driving vehicle and a driven vehicle. The driving vehicle comprises an engine, transmission system, travel system, braking system, hydraulic steering system, vehicle frame, and electrical system; the driven vehicle comprises a travel system, braking system, hydraulic steering system, vehicle frame, etc. The driving vehicle is driven by the engine, while the driven vehicle is driven by forward friction and is equipped with a small engine to return on its own. Detailed parameters of the beam transporters are shown in Table 2:

[0090] Table 2 Technical parameters of beam transport vehicle

[0091] Serial number project Specification Remark 1 Rated load capacity 600 tons 2 Engine model D12.42 3 Engine power 309KW (420 horsepower) 4 Rated engine speed 2000 rpm 5 gearbox Allison 6 Steering gear BZZ-1000C 7 Steering cylinder Cylinder diameter φ80 8 Inflation pressure 1.1MPa 9 Main vehicle tire specifications 13.00-25 10 Auxiliary vehicle tire specifications 14.00-20 11 wheelbase 2754 12 Adapt to the slope Horizontal slope: 2% Longitudinal slope: 3% 13 Turning radius (transport 32m 60m 14 Deadweight 70t 15 Main vehicle appearance 15670×3520×2150 16 Sub-car appearance 11440×3565×2120 17 Beam transport speed 9km / h

[0092] The above describes one embodiment of the present invention by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements may be made to the embodiment of the present invention without departing from the scope of the present invention, or some of its technical features may be replaced by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the content of the appended claims.

Claims

1. A method for erecting a large-tonnage box girder on a small-radius curved ramp, characterized in that: The following steps are involved: S1. Preparation for the curved section of the bridge erection machine: After the box girder of the previous hole is lowered, the curved section is ready for the hole. The bridge erection machine column No. 3 is flipped up, and the girder transport vehicle returns. The stroke of the bridge erection machine column No. 1 is M, the stroke of the bridge erection machine column No. 2 is L, and the stroke of the bottom transverse bolster of the bridge erection machine column No. 1 is N. At this time, the center lines of the bridge erection machine columns No. 1, No. 2, and No. 3 are all aligned with the center line of the bridge deck, and the center line of the bridge deck is also aligned with the center line of the pier; S2. Bridge erection machine attitude offset adjustment: the bridge erection machine boom moves forward, and at the same time, the front and rear two crane beams on the boom return to the tail of the boom to act as counterweights, and then the bridge erection machine attitude offset adjustment is performed as close to the curve as possible. The arm of the second column continues to offset to the outside of the curve, with an offset of ≤L / 2. The offset of the arm of the second column drives the third column to offset outward with a maximum offset P. The arm of the first column of the bridge erection machine offsets to the inside of the curve by m1, m1≤M / 2, and at the same time, the crossbeam of the first column moves horizontally, and the pillow beam offsets to the inside of the curve by n1, n1≤N. At this time, the first column The center of the No. 1 column is close to the center of the pier to be erected in the next hole with an offset of m1+n1 and an adjustment margin is reserved for the offset of the subsequent No. 1 column. After the posture of the bridge erection machine is adjusted, the No. 3 column is supported on the pier of the erected box beam. After the support of the No. 3 column is completed, the No. 2 column is folded up and moved forward to the next hole beam erection position and supported on the center of the erected box beam. The No. 1 column is folded up and moved forward to the pier to be erected in the next hole. At this time, the No. 1 column is suspended in the air and not supported. The center of the No. 1 column's bolster, the transverse bolster, the pier to be erected and the No. 1 column's arm do not coincide. S3, support of column No. 1: determine the offset adjustment amount of the center line of column No. 1 according to the offset between column No. 1 and the center of the pier to be erected in the next hole, and the offset adjustment amount does not exceed the reserved adjustment margin. The column No. 1 and the transverse bolster are offset by m2, m2≤M. After the bolster of column No. 1 is transversely moved into place, that is, the bolster coincides with the center of the pier to be erected, the transverse bolster is further transversely moved by n2 and a margin is reserved for the final positioning of the transverse bolster. At this time, the transverse center does not coincide with the center of the pier to be erected and the center of the arm of column No. 1, n2≤N and n1+n2≤N, and a steel bolster is placed inside the pedestal of the pier to be erected to support column No. 1; S4. Adjust the height of the whole machine: according to the slope requirements, raise the whole machine, move the two crane beams on the boom forward to the rear end of the No. 1 column to act as counterweight, retract the No. 3 column and flip it up, and move the boom forward; S5. Adjust the position of column No. 1: Column No. 1 is offset by n3 through the transverse bolster, where n3 ≤ N and n3 does not exceed the final positioning margin of the transverse bolster. At this point, the bolster of column No. 1, the transverse bolster, and the center of the pier to be erected coincide. Simultaneously, the arm of column No. 1 is laterally shifted m3 until the arm coincides with the center of column No. 1, and the curved section of the bridge erection machine is completed. S6, beam feeding: the front and rear beam transport vehicles feed the beams into place, the two beam cranes return to the beam lifting position, the front beam crane installs the boom to lift the front end of the box beam, the front beam crane moves forward with the beam, and the rear beam transport vehicle moves forward synchronously. When the lifting hole at the rear end of the box beam reaches below the rear beam crane, the vehicle stops, anti-slip blocks are set on the downhill direction of the beam transport vehicle, and the rear beam transport vehicle sets the outriggers; S7, beam drop position adjustment: The third column flips down and falls onto the beam transport vehicle and stands upright. At the same time, the rear beam crane is installed with a boom to lift the rear end of the box beam. The arm of the second column shifts toward the curve and drives the third column to shift until the center of the rear beam crane on the boom coincides with the center of the lifting point of the box beam to be lifted. S8. Alignment and lowering of beams: After the two beam cranes have moved to their proper positions, they stop lowering when they are 100-300mm above the pier top pad stone. The No.3 column is flipped up, and the beam transport vehicle withdraws and returns to the beam yard to install beams. After the beam transport vehicle withdraws, the arm of the No.2 column is offset to the outside of the curve until the center of the box beam coincides with the center of the pier to be erected. The beams are then aligned and lowered, and the erection of the box beam is completed.

2. The method for erecting a large-tonnage box girder on a small-radius curved ramp according to claim 1, characterized in that: The maximum offset P of the third column is the maximum displacement that the third column can support on the web of the box beam when the center of the third column coincides with the center of the box beam and after the third column is offset.

3. The method for erecting a large-tonnage box girder on a small-radius curved ramp according to claim 1, characterized in that: The stroke M of the arm of the No. 1 column is smaller than the stroke N of the transverse bolster, and the stroke M of the arm of the No. 1 column of the bridge erection machine is smaller than the stroke L of the arm of the No. 2 column of the bridge erection machine.

4. The method for erecting a large-tonnage box girder on a small-radius curved ramp according to claim 1, characterized in that: The No. 1 column of the bridge erection machine is provided with an upper driving device for adjusting the position of the No. 1 column machine arm and the bridge erection machine boom, and a lower driving device for adjusting the position of the No. 1 column pillow beam and the transverse pillow beam.

5. The method for erecting a large-tonnage box girder on a small-radius curved ramp according to claim 4 is characterized in that: The upper driving device includes a driving oil cylinder installed on the boom, and the movement of the driving oil cylinder drives the position adjustment of the No. 1 column machine arm on the boom of the bridge erecting machine.

6. The method for erecting a large-tonnage box girder on a small-radius curved ramp according to claim 4, characterized in that: The lower driving device comprises a bolster (9) arranged on the support of the No. 1 column, and a transverse bolster (8) fixed at the bottom of the No. 1 column and slidably mounted on the bolster (9); a driving cylinder for driving the transverse bolster (8) is arranged between the bolster (9) and the transverse bolster (8); a fixed end of the driving cylinder is mounted on the bolster (9), and an actuating end of the driving cylinder is connected to the transverse bolster (8).

7. The method for erecting a large-tonnage box girder on a small-radius curved ramp according to claim 1, characterized in that: The first column, the second column and the third column are all provided with telescopic joints, and the height requirements of the first column, the second column and the third column during installation can be met by adjusting the telescopic joints.

8. The method for erecting a large-tonnage box girder on a small-radius curved ramp according to claim 1, characterized in that: In the step S2 of adjusting the attitude offset of the bridge-building machine, the center line of the third column does not coincide with the center line of the erected box girder.

9. The method for erecting a large-tonnage box girder on a small-radius curved ramp according to claim 1, characterized in that: The offset of the center of the No. 1 column is a dynamically adjusted offset, and its maximum offset is M / 2+N. The maximum offset P of the No. 3 column is a statically adjusted offset.

10. The method for erecting a large-tonnage box girder on a small-radius curved ramp according to claim 1, characterized in that: The curve radius of the curved section does not exceed 400 meters and the slope in the curved section is not less than 30‰. The bridge-building machine is adjusted with a posture offset closest to the curve, which means that in step S2, the straight line where the bridge-building machine's main arm is located is tangent to the curved section with the maximum slope to reduce the adjustment amount of the bridge-building machine's No. 1 column in subsequent steps.

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