Construction method for converting two-bridge bridge girder of bridge erecting machine into three-bridge bridge hole and changing amplitude

Abstract

The bridge erecting machine two-bridge-to-three-bridge hole conversion and amplitude conversion construction method is performed according to the following steps: (1) construction preparation; (2) adding a temporary pier top bracket on the front pier cap beam; (3) horizontal adjustment of the main beam at the front and middle support legs of the bridge erecting machine; (4) first longitudinal movement of the main beam of the bridge erecting machine; (5) reversing and anchoring the front and rear middle support legs; (6) second longitudinal movement of the main beam of the bridge erecting machine; (7) horizontal movement of the rear middle support leg out of the hole and supporting on the temporary pier top bracket; (8) horizontal adjustment of the main beam at the rear middle support leg of the bridge erecting machine, completing the two-bridge-to-three-bridge hole conversion of the bridge erecting machine; (9) completing the erection of two bridges; (10) right bridge erecting machine hole withdrawal; (11) erecting the middle bridge; (12) repeating the hole conversion and amplitude conversion bridge erection steps according to the amplitude conversion sequence, completing the erection of the remaining three bridges. The present application reduces the safety risk in the construction process, speeds up the construction progress, achieves good economic and social benefits, and expands the application field of the bridge erecting machine segmental bridge construction technology.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a method for converting a bridge erecting machine from two spans to three spans across a span and for variable-amplitude construction. Background Technology

[0002] When the bridge erecting machine moves from the span between two bridge sections to the span between three bridge sections, the longitudinal alignment of the main beam shifts outward, and the position of the supporting legs also needs to be changed accordingly. However, there is insufficient space to support the outer portion of the rear middle support leg of the bridge erecting machine during the transition from two to three bridge sections. The traditional approach is to erect an auxiliary support frame for the rear middle support leg, but this is time-consuming and economically inefficient. Therefore, ensuring the safe and convenient passage of the bridge erecting machine from two to three bridge sections, and how to safely, quickly, and efficiently carry out the segmental beam erection construction for the three bridge sections, are the technical challenges of this segmental beam erection. Summary of the Invention

[0003] The purpose of this invention is to provide a method for the conversion and variable-amplitude construction of a bridge erecting machine from two bridge spans to three bridge spans. This invention reduces safety risks during construction, accelerates construction progress, achieves good economic and social benefits, and broadens the application field of the bridge erecting machine for segmental beams.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The method for bridge erecting machine to switch between two-span and three-span bridge spans and to perform variable-amplitude construction is as follows: (a) Construction preparation; (ii) Preparation for the bridge erecting machine to pass through the span: a temporary pier top bracket is added to the outside of the cap beam of the front pier (P26); (iii) Lateral adjustment of the main beam at the front middle support leg of the bridge erecting machine; (iv) Initial longitudinal movement of the main beam by the bridge erecting machine; (v) Replace and anchor the front and rear middle outriggers; (vi) Secondary longitudinal movement of the main beam of the bridge erecting machine; (vii) The rear middle outrigger is disengaged and moved laterally to be supported on the temporary pier top bracket; (viii) The main beam at the rear middle support leg of the bridge erecting machine is adjusted laterally to complete the conversion of the bridge erecting machine from two bridges to three bridges passing through the span; (ix) Complete the erection of two of the bridge sections; (x) The right-side bridge erecting machine withdraws from the hole; (xi) The right-side bridge erecting machine moves laterally to change its luffing and crosses the span to erect the middle-span bridge; (xii) Repeat the span crossing and span-changing girder erection steps in the order of amplitude change to complete the erection of the remaining three bridge spans.

[0005] The temporary pier top support includes a base and two steel pipes. The base is permeated with first anchoring threaded steel bars anchored to the outside of the cap beam of the front pier (P26). The first anchoring threaded steel bars are threaded with first fastening nuts that are tightly pressed against the upper surface of the base. The two steel pipes are arranged vertically side by side. The lower ends of the two steel pipes are welded and fixed to the upper surface of the base. The upper ends of the two steel pipes are welded and fixed with supports. The supports are fixed with hinge seats on three sides. The hinge seats are hinged with struts. The lower ends of the struts are hinged with fixed seats. The fixed seats are permeated with second anchoring threaded steel bars anchored to the cap beam of the front pier (P26). The second anchoring threaded steel bars are threaded with second fastening nuts that are tightly pressed against the upper surface of the fixed seats.

[0006] Step (1) specifically involves: providing technical and safety briefings to construction workers on the conversion of the bridge erecting machine from two spans to three spans and the variable-amplitude construction, informing them of potential hazards and corresponding emergency measures, and inspecting the construction equipment and high-altitude operation protection measures before construction to ensure normal operation.

[0007] Step (II) is as follows: Based on the on-site survey and stress calculation, a pair of temporary pier top brackets are added at the corresponding distance on the outside of the front pier (P26) cap beam. The two temporary pier top brackets correspond one-to-one with the left and right bridge erecting machines, respectively. The position, depth and preload of the first and second anchoring threaded steel bars of the temporary pier top brackets are determined according to the calculation sheet. A pair of front auxiliary support leg brackets are installed on the top of the pre-pier (P25) cap beam in the direction of the large mileage. The two front auxiliary support leg brackets correspond one-to-one with the left and right bridge erecting machines, so that the overhead cranes on the two bridge erecting machines are moved to the tail of the corresponding bridge erecting machines to prepare for crossing the span. Before crossing the span, check whether the front and rear middle support legs of the corresponding bridge erecting machines are anchored, and measure the longitudinal slope of the main beam of the bridge erecting machine. Based on the measurement data and the top elevation of the pre-pier (P25), calculate the height adjustment required for each support leg of the bridge erecting machine. Adjust the height of the front and rear auxiliary support legs by adjusting the oil cylinders on the sides of the front and rear auxiliary support legs and the spiral jacks at the bottom. At the same time, adjust the height of the front and rear middle support legs by adjusting the support oil cylinders at the bottom of the front and rear middle support legs. Step (3) specifically involves: releasing the locking of the main beam of the bridge erecting machine to the crossbeam pin of the front middle support leg, releasing the locking of the jacking cylinder and anchor rod of the front middle support leg to the main beam of the bridge erecting machine, and moving the main beam of the bridge erecting machine laterally through the lateral movement cylinder of the front middle support leg to achieve the purpose of rotating the main beam of the bridge erecting machine with the rear middle support leg as the axis; after calculation and adjustment based on the actual site conditions, the main beam at the position of the front middle support leg of the left bridge erecting machine is finally moved laterally to the outside of the cap beam to a position 2535mm away from the center line of the left beam, and the main beam at the position of the front middle support leg of the right bridge erecting machine is moved laterally to the outside of the cap beam to a position 3300mm away from the center line of the right beam.

[0008] Step (iv) is as follows: The operation of the two bridge erecting machines is the same. Therefore, only the longitudinal movement step of the main beam of the bridge erecting machine is described: retract the rear auxiliary leg and hang it on the main beam of the bridge erecting machine. Release the locking of the jacking cylinder of the rear middle leg to the main beam of the bridge erecting machine. Connect the jacking cylinder of the front middle leg to the main beam of the bridge erecting machine. Start the jacking cylinder of the front middle leg to make the main beam of the bridge erecting machine begin to move longitudinally. When the front auxiliary leg reaches the corresponding front auxiliary leg bracket anchor point on the top of the cap beam of the advanced pier (P25), stop the longitudinal movement and anchor the front auxiliary leg to the top of the cap beam of the advanced pier (P25) through the front auxiliary leg bracket anchor point.

[0009] Step (5) is as follows: the rear auxiliary support leg supports the bridge erecting machine, the rear middle support leg is detached from the rear pier (P27) cap beam, and the rear middle support leg is lifted by a crane to the rear of the front middle support leg to support the bridge erecting machine, so that the rear middle support leg is anchored to the bridge deck through the pre-embedded anchor points. Then, the front and middle support legs are suspended in the air. The bridge erecting machine is supported by the front auxiliary support legs, the rear auxiliary support legs, and the rear middle support legs. The front and middle support legs are lifted and moved to the anchorage point of the pre-pier (P25) cap beam by the overhead crane and anchored.

[0010] Step (six) is as follows: retract the front and rear auxiliary legs, so that the front and rear auxiliary legs are suspended on the main beam of the bridge erecting machine, and remove the front auxiliary leg bracket; move the gantry crane as a counterweight to the mid-span of the front pier (P26) and the advanced pier (P25), and the whole machine is converted to the through-span state; connect the jacking cylinder of the rear middle support leg to the main beam of the bridge erecting machine; release the jacking cylinder of the front middle support leg from the main beam of the bridge erecting machine; start the jacking cylinder of the rear middle support leg; and push the bridge erecting machine to continue to move forward longitudinally until all the beam hanging points of the main beam of the bridge erecting machine are completely located between the front and rear middle support legs.

[0011] Step (VII) is as follows: Release the locking between the main beam of the bridge erecting machine and the front and rear middle support legs, release the locking between the front and rear middle support leg push cylinders and the main beam of the bridge erecting machine, so that the main beam at the rear middle support leg of the left bridge erecting machine moves laterally to the inside of the cap beam to 2030mm from the center line of the left beam, so that the main beam at the rear middle support leg of the right bridge erecting machine moves laterally to the inside of the cap beam to 2100mm from the center line of the right beam, move the rear auxiliary support leg of the left bridge erecting machine forward to 12450mm from the rear middle support leg, move the rear auxiliary support leg of the right bridge erecting machine forward to 7585mm from the rear middle support leg, and shift the rear auxiliary support leg as inward as possible relative to the main beam; Next, the rear auxiliary outriggers support the bridge erecting machine and anchor it to the bridge deck. The rear middle outriggers are then retracted and detached. The rear middle outriggers are moved by the overhead crane to the original position of the front middle outriggers and kept in a detached state. The front and rear middle outriggers' push cylinders are locked to the main beam. Using the rear middle outriggers' lateral movement cylinders, the rear middle outriggers of the left and right bridge erecting machines are moved laterally to the outside of the cap beam relative to the main beam until the outer cylinders of the rear middle outriggers land on the corresponding temporary pier top brackets. After the lateral movement is completed, the main beam of the left bridge erecting machine is 2170mm away from the center line of the left beam, and the main beam of the right bridge erecting machine is 2360mm away from the center line of the right beam.

[0012] Step (8) is as follows: detach the rear auxiliary support leg and move it to the center line of the main beam. Using the front middle support leg as the axis, rotate the bridge erecting machine horizontally at a certain angle. Use the rear middle support leg lateral movement cylinder to move the main beam at the rear middle support leg of the left bridge erecting machine laterally to the outside of the cap beam to a position 3190mm away from the center line of the left beam. Move the main beam at the rear middle support leg of the right bridge erecting machine laterally to the outside of the cap beam to a position 3250mm away from the center line of the right beam. Next, the main beam is moved laterally. The main beam at the rear middle support leg of the left bridge erecting machine is moved laterally to the outside of the cap beam to a position 7300mm from the center line of the left beam. The main beam at the rear middle support leg of the right bridge erecting machine is moved laterally to the outside of the cap beam to a position 6360mm from the center line of the right beam. The bridge erecting machine has now completed the transition from two bridge spans to three bridge spans. The gantry crane returns to the mid-span of the front pier (P26) and the advanced pier (P25). Then, the longitudinal slope of the main beam of the bridge erecting machine is re-measured. If the longitudinal slope of the main beam of the bridge erecting machine exceeds 2%, the height of the front and rear auxiliary support legs is adjusted by adjusting the hydraulic cylinders on the sides of the front and rear auxiliary support legs and the spiral jacks at the bottom. At the same time, the height of the front and rear middle support legs is adjusted by adjusting the support hydraulic cylinders at the bottom of the front and rear middle support legs. The overall height of the machine is adjusted. The beam can only be hung when the longitudinal slope of the main beam of the bridge erecting machine is within 2%.

[0013] Step (nine) is as follows: According to the designed girder erection plan, first erect the left and right spans of the bridge between the front pier (P26) and the advanced pier (P25). The segmental beams are transported to the designated location. The No. 1 segment is lifted by a crane to the designed position of the cap beam of the advanced pier (P25). φ40mm precision-rolled threaded steel is used to suspend it on the main beam. Then, the crane lifting equipment is released, the conversion is completed, and the crane is driven away. The remaining segmental beams are lifted and suspended sequentially from the advanced pier (P25) to the front pier (P26) to complete the beam lifting and the erection of the left and right spans of the bridge between the front pier (P26) and the advanced pier (P25). A pair of front auxiliary support brackets are installed on the top of the cap beam of the advanced pier (P24) in the direction of the largest mileage to prepare for the bridge erection machine to continue passing through the span.

[0014] Step (10) is as follows: After the right span bridge erecting machine completes the erection of the right span bridge between the front pier (P26) and the advanced front pier (P25), the right span bridge erecting machine retracts to the space between the rear pier (P27) and the front pier (P26) to prepare for the right span bridge erecting machine to move laterally to the middle span. The process of retracting the right-side bridge erecting machine from the hole is the same as the previous hole-passing steps, but the operation is reversed to allow the right-side bridge erecting machine to retract to the original hole-passing position.

[0015] Step (XI) is as follows: After the right span bridge erecting machine retreats to the space between the rear pier (P27) and the front pier (P26), the right span bridge erecting machine moves laterally and passes through the space to the middle span between the front pier (P26) and the advanced pier (P25) to erect the middle span bridge between the front pier (P26) and the advanced pier (P25). By following the above-mentioned construction method of converting two span bridges to three span bridges through the space, the right span bridge erecting machine can reach the middle span between the front pier (P26) and the advanced pier (P25).

[0016] In addition, after the left-side bridge crane completes the erection of the left-side bridge between the front pier (P26) and the advanced pier (P25), it directly erects the left-side bridge between the advanced pier (P25) and the advanced pier (P24) through the span.

[0017] This invention has outstanding substantive features and significant progress compared to existing technologies. Specifically, it is easy to operate, safe, and effectively improves the applicability and safety performance of bridge erecting machines, greatly reducing the safety risks to personnel and machinery during construction. It is highly efficient and practical, overcoming the problem of erecting a large number of temporary auxiliary support frames during the bridge erecting machine's transition from two-span to three-span bridges, thus improving the applicability and operational efficiency of the bridge erecting machine. It is also simple in facilities and economical, reducing construction costs by utilizing additional small temporary pier top brackets, resulting in significant social and economic benefits. Attached Figure Description

[0018] Figure 1 This is a flowchart of the construction process of the present invention.

[0019] Figure 2 This is a front view of the temporary pier top bracket of the present invention.

[0020] Figure 3 This is a schematic diagram of the bridge erecting machine preparing for the hole in this invention.

[0021] Figure 4 yes Figure 3 Top view.

[0022] Figure 5 yes Figure 3 The bridge cross-section at the front pier (P26) is shown in the diagram.

[0023] Figure 6 This is a schematic diagram of the lateral adjustment of the main beam at the front middle support leg of the bridge erecting machine of the present invention.

[0024] Figure 7 yes Figure 6 Top view.

[0025] Figure 8 yes Figure 6The bridge cross-section at the front pier (P26) is shown in the diagram.

[0026] Figure 9 This is a schematic diagram of the initial longitudinal movement of the main beam of the bridge erecting machine according to the present invention.

[0027] Figure 10 yes Figure 9 Top view.

[0028] Figure 11 This is a schematic diagram of the secondary longitudinal movement of the main beam of the bridge erecting machine of the present invention.

[0029] Figure 12 yes Figure 11 Top view.

[0030] Figure 13 This is a schematic diagram of the lateral adjustment of the main beam at the rear middle support leg of the bridge erecting machine according to the present invention.

[0031] Figure 14 yes Figure 13 Top view.

[0032] Figure 15 yes Figure 13 The bridge cross-section at the front pier (P26) is shown in the diagram.

[0033] Figure 16 This is a schematic diagram of the bridge erecting machine of the present invention after completing the conversion from two bridges to three bridges through the arch.

[0034] Figure 17 yes Figure 16 Top view.

[0035] Figure 18 yes Figure 16 The bridge cross-section at the front pier (P26) is shown in the diagram.

[0036] Figure 19 This is a schematic diagram of the rear middle support leg of the present invention being supported on the temporary pier top bracket.

[0037] Attached diagram labels: 1-Main beam of bridge erecting machine; 2-Cap beam; 3-Temporary pier top bracket; 4-Base; 5-Steel pipe; 6-First anchoring threaded steel bar; 7-First fastening nut; 8-Support; 9-Hinge seat; 10-Strut; 11-Fixed seat; 12-Second anchoring threaded steel bar; 13-Second fastening nut; 14-Front auxiliary support leg bracket; 15-Heavy crane; 16-Front middle support leg; 17-Rear middle support leg; 18-Front auxiliary support leg; 19-Rear auxiliary support leg; 20-Bridge; 21-Trolley; P27-Rear pier; P26-Front pier; P25-Advanced pier; P24-Advanced pier. Detailed Implementation

[0038] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0039] like Figure 1-19 As shown, a method for bridge erecting machine to convert from two-span to three-span bridge spans and to perform variable-amplitude construction is carried out according to the following steps: (a) Construction preparation; (ii) Preparation for the bridge erecting machine to pass through the span: add a temporary pier top bracket 3 on the cap beam 2 of the front pier (P26); (iii) Lateral adjustment of the main beam 1 at the front middle support leg of the bridge erecting machine; (iv) Initial longitudinal movement of the main beam 1 of the bridge erecting machine; (v) Replace and anchor the front and rear middle outriggers 16 and 17; (vi) Secondary longitudinal movement of the main beam 1 of the bridge erecting machine; (vii) The rear middle support leg 17 is disengaged and moved laterally to be supported on the temporary pier top bracket 3; (viii) The main beam 1 at the rear middle support leg of the bridge erecting machine is adjusted laterally to complete the conversion of the bridge erecting machine from two bridges to three bridges through the span; (ix) Complete the erection of two of the bridge sections; (x) The right-side bridge erecting machine withdraws from the hole; (xi) The right-side bridge erecting machine moves laterally to change its luffing and crosses the span to erect the middle-span bridge; (xii) Repeat the span crossing and span-changing girder erection steps in the order of amplitude change to complete the erection of the remaining three bridge spans.

[0040] The temporary pier top support 3 includes a base 4 and two steel pipes 5. The base 4 is equipped with first anchoring threaded steel bars 6 that are anchored to the cap beam 2 of the front pier (P26). The first anchoring threaded steel bars 6 are threaded with first fastening nuts 7 that are tightly pressed against the upper surface of the base 4. The two steel pipes 5 are arranged vertically side by side. The lower ends of the two steel pipes 5 are welded and fixed to the upper surface of the base 4. The upper ends of the two steel pipes 5 are welded and fixed with supports 8. The supports 8 are fixed with hinge seats 9 on three sides. The hinge seats 9 are hinged with struts 10. The lower ends of the struts are hinged with fixed seats 11. The fixed seats 11 are equipped with second anchoring threaded steel bars 12 that are anchored to the cap beam 2 of the front pier (P26). The second anchoring threaded steel bars 12 are threaded with second fastening nuts 13 that are tightly pressed against the upper surface of the fixed seats 11.

[0041] Step (1) specifically involves: providing technical and safety briefings to construction workers on the conversion of the bridge erecting machine from two spans to three spans and the variable-amplitude construction, informing them of potential hazards and corresponding emergency measures, and inspecting the construction equipment and high-altitude operation protection measures before construction to ensure normal operation.

[0042] Step (II) is as follows: Based on the on-site survey and stress calculation, a pair of temporary pier top brackets 3 are added at the corresponding distance on the outside of the cap beam 2 of the front pier (P26). The two temporary pier top brackets 3 correspond one-to-one with the left bridge erecting machine and the right bridge erecting machine, respectively. The position, depth and preload of the first anchoring threaded steel bar 6 and the second anchoring threaded steel bar of the temporary pier top bracket 3 are determined according to the calculation sheet. A pair of front auxiliary support leg brackets 14 are installed on the top of the pre-pier (P25) cap beam in the direction of the large mileage. The two front auxiliary support leg brackets 14 correspond one-to-one with the left and right bridge erecting machines, so that the overhead cranes 15 on the two bridge erecting machines are moved to the tail of the corresponding bridge erecting machines to prepare for crossing the hole. Before crossing the hole, check whether the front middle support leg 16 and rear middle support leg 17 of the corresponding bridge erecting machine are anchored, and measure the longitudinal slope of the main beam 1 of the bridge erecting machine. Based on the measurement data and the top surface elevation of the pre-pier (P25), calculate the height adjustment required for each support leg of the bridge erecting machine. Adjust the height of the front and rear auxiliary support legs 18 and 19 respectively by adjusting the oil cylinders on the side of the front and rear auxiliary support legs 19 and the spiral jacks at the bottom. At the same time, adjust the height of the front and rear middle support legs 16 and 17 respectively by supporting oil cylinders at the bottom of the front and rear middle support legs 16 and 17. Step (III) is as follows: Release the locking of the crossbeam pin of the main beam 1 of the bridge erecting machine and the front middle support leg 16, release the locking of the jacking cylinder and anchor rod of the front middle support leg 16 to the main beam 1 of the bridge erecting machine, and move the main beam 1 of the bridge erecting machine laterally through the lateral movement cylinder of the front middle support leg 16 to achieve the purpose of rotating the main beam 1 of the bridge erecting machine with the rear middle support leg 17 as the axis; after calculation and adjustment in combination with the actual site conditions, the main beam at the position of the front middle support leg 16 of the left bridge erecting machine is finally moved laterally to the outside of the cap beam to a position 2535mm away from the center line of the left beam, and the main beam at the position of the front middle support leg 16 of the right bridge erecting machine is moved laterally to the outside of the cap beam to a position 3300mm away from the center line of the right beam.

[0043] Step (IV) is as follows: The operation of the two bridge erecting machines is the same. Therefore, only the longitudinal movement step of the main beam 1 of the bridge erecting machine is described: The rear auxiliary support leg 19 is retracted and suspended on the main beam 1 of the bridge erecting machine. The locking of the jacking cylinder of the rear middle support leg 17 to the main beam 1 of the bridge erecting machine is released. The jacking cylinder of the front middle support leg 16 is connected to the main beam 1 of the bridge erecting machine. The jacking cylinder of the front middle support leg 16 is started to make the main beam 1 of the bridge erecting machine begin to move longitudinally. When the front auxiliary support leg 18 reaches the corresponding anchoring point of the front auxiliary support leg bracket 14 on the top of the cap beam of the advanced pier (P25), the longitudinal movement is stopped. The front auxiliary support leg 18 is anchored to the top of the cap beam of the advanced pier (P25) through the anchoring point of the front auxiliary support leg bracket 14.

[0044] Step (5) is as follows: the rear auxiliary support leg 19 supports the bridge erecting machine, the rear middle support leg 17 is detached from the rear pier (P27) cap beam, and the crane 15 is used to lift the rear middle support leg 17 to the rear of the front middle support leg 16 to support the bridge erecting machine, so that the rear middle support leg 17 is anchored to the bridge deck through the pre-embedded anchor points. Then, the front middle support leg 16 is suspended in the air. The bridge erecting machine is supported by the front auxiliary support leg 18, the rear auxiliary support leg 19 and the rear middle support leg 17. The front middle support leg 16 is lifted and moved to the anchoring point of the cap beam of the advanced pier (P25) by the overhead crane 15 and supported and anchored. Step (six) is as follows: retract the front auxiliary leg 18 and the rear auxiliary leg 19, so that the front auxiliary leg 18 and the rear auxiliary leg 19 are suspended on the main beam 1 of the bridge erecting machine, and remove the front auxiliary leg bracket 14; the gantry crane 15 is moved as a counterweight to the mid-span of the front pier (P26) and the advanced pier (P25), the whole machine is converted to the through-span state, the jacking cylinder of the rear middle support leg 17 is connected to the main beam 1 of the bridge erecting machine, the jacking cylinder of the front middle support leg 16 is released from the lock of the main beam 1 of the bridge erecting machine, the jacking cylinder of the rear middle support leg 17 is started, and the bridge erecting machine is pushed forward longitudinally until all the beam hanging points of the main beam 1 of the bridge erecting machine are completely located between the front middle support leg 16 and the rear middle support leg 17.

[0045] Step (seven) is as follows: Release the locking between the main beam 1 of the bridge erecting machine and the front and rear middle support legs 17, release the locking between the front and rear middle support legs 17 push cylinders and the main beam 1 of the bridge erecting machine, so that the main beam at the rear middle support leg 17 of the left bridge erecting machine moves laterally to the inside of the cap beam to a position 2030mm away from the center line of the left beam, and the main beam at the rear middle support leg 17 of the right bridge erecting machine moves laterally to the inside of the cap beam to a position 2100mm away from the center line of the right beam, the rear auxiliary support leg 19 of the left bridge erecting machine moves forward to a position 12450mm away from the rear middle support leg 17, and the rear auxiliary support leg 19 of the right bridge erecting machine moves forward to a position 7585mm away from the rear middle support leg 17, and the rear auxiliary support leg 19 is offset as much as possible inward relative to the main beam; Next, the rear auxiliary support leg 19 supports the bridge erecting machine and anchors it to the bridge deck. The rear middle support leg 17 is retracted and detached. The rear middle support leg 17 is lifted by the overhead crane 15 to the original position of the front middle support leg 16 (front pier (P26) cap beam), and kept in a detached state. The front and rear middle support legs 17 push cylinders are locked to the main beam. Using the lateral movement cylinder of the rear middle support leg 17, the rear middle support legs 17 of the left and right bridge erecting machines are moved laterally to the outside of the cap beam relative to the main beam until the outer cylinder of the rear middle support leg 17 falls on the corresponding temporary pier top bracket 3. After the lateral movement is completed, the distance between the main beam 1 of the left bridge erecting machine and the center line of the left beam is 2170mm, and the distance between the main beam 1 of the right bridge erecting machine and the center line of the right beam is 2360mm.

[0046] Step (8) Release the rear auxiliary support leg 19 and move it to the center line of the main beam. Using the front middle support leg 16 as the axis, rotate the bridge erecting machine horizontally at a certain angle. Use the lateral movement cylinder of the rear middle support leg 17 to move the main beam at the rear middle support leg 17 of the left bridge erecting machine laterally to the outside of the cap beam to a position 3190mm away from the center line of the left beam. Move the main beam at the rear middle support leg 17 of the right bridge erecting machine laterally to the outside of the cap beam to a position 3250mm away from the center line of the right beam. Next, the main beam is moved laterally. The main beam at the rear middle support leg 17 of the left bridge erecting machine is moved laterally to the outside of the cap beam to a position 7300mm from the center line of the left beam. The main beam at the rear middle support leg 17 of the right bridge erecting machine is moved laterally to the outside of the cap beam to a position 6360mm from the center line of the right beam. The bridge erecting machine has now completed the transition from two bridge spans to three bridge spans. The overhead crane 15 returns to the mid-span of the front pier (P26) and the advanced pier (P25). Then, the longitudinal slope of the main beam 1 of the bridge erecting machine is re-measured. If the longitudinal slope of the main beam 1 of the bridge erecting machine exceeds 2%, the height of the front and rear auxiliary support legs 19 is adjusted by the adjusting cylinders on the sides of the front and rear auxiliary support legs 19 and the spiral jacks at the bottom. At the same time, the height of the front and rear middle support legs 17 is adjusted by the supporting cylinders at the bottom of the front and rear middle support legs 17. The overall height of the machine is adjusted. The beam can only be hung when the longitudinal slope of the main beam 1 of the bridge erecting machine is within 2%.

[0047] Step (nine) is as follows: According to the design beam erection scheme, first erect the left and right spans of the bridge between the front pier (P26) and the advanced pier (P25). The segment beams are transported to the position, and the No. 1 segment is lifted by the overhead crane 15. The No. 1 segment is lifted by the overhead crane 15 to the design position of the cap beam of the advanced pier (P25). The φ40mm precision rolled threaded steel is used to hang it on the main beam. Then the lifting device of the overhead crane 15 is released to complete the conversion. The overhead crane 15 is driven away, and the remaining segment beams are lifted and suspended from the advanced pier (P25) to the front pier (P26) in sequence to complete the beam lifting and complete the erection of the left and right spans of the bridge between the front pier (P26) and the advanced pier (P25). A pair of front auxiliary support brackets 14 are installed on the top of the cap beam of the advanced pier (24) in the direction of the large mileage to prepare for the bridge erection machine to continue to pass through the span.

[0048] Step (10) is as follows: After the right span bridge erecting machine completes the erection of the right span bridge between the front pier (P26) and the advanced front pier (P25), the right span bridge erecting machine retracts to the space between the rear pier (P27) and the front pier (P26) to prepare for the right span bridge erecting machine to move laterally to the middle span. The process of retracting the right-side bridge erecting machine from the hole is the same as the previous hole-passing steps, but the operation is reversed to allow the right-side bridge erecting machine to retract to the original hole-passing position.

[0049] Step (XI) is as follows: After the right span bridge erecting machine retreats to the space between the rear pier (P27) and the front pier (P26), the right span bridge erecting machine moves laterally and passes through the space to the middle span between the front pier (P26) and the advanced pier (P25) to erect the middle span bridge between the front pier (P26) and the advanced pier (P25). By following the above-mentioned construction method of converting two span bridges to three span bridges through the space, the right span bridge erecting machine can reach the middle span between the front pier (P26) and the advanced pier (P25).

[0050] In addition, after the left-side bridge crane completes the erection of the left-side bridge between the front pier (P26) and the advanced pier (P25), it directly erects the left-side bridge between the advanced pier (P25) and the advanced pier (P24) through the span.

[0051] To maximize the construction efficiency of the bridge erecting machine, the three bridge spans should be erected in the following order as shown in the table below: Table 1. Sequence of Bridge Construction (P25-P22)

[0052] In the table: L - left bridge; R - right bridge; M - middle bridge; P27 - rear pier; P26 - front pier; P25 - advanced pier; P24 - advanced pier; ... and so on, P22 - super advanced pier.

[0053] This invention is easy to operate and has good safety, effectively improving the applicability and safety performance of the bridge erecting machine and greatly reducing the safety risks to personnel and machinery during construction. It is highly efficient and practical, overcoming the problem of erecting a large number of temporary auxiliary support frames in the previous bridge erecting machine cross-span conversion operation from two-span to three-span bridges, thus improving the applicability and operational efficiency of the bridge erecting machine. The facilities are simple and economical, and the use of the added small temporary pier top bracket 3 reduces construction costs, resulting in significant social and economic benefits.

[0054] I. During handling and hoisting, special care should be taken to avoid accidents such as twisting, impact, and deformation. At the same time, the following regulations should be observed: A single structural component must be lifted using at least two lifting points.

[0055] B. Padding must be used to secure the steel wire rope at the point of contact with the structure.

[0056] C. When lifting the main frame and extra-long components, the lifting points should be set at 0.22L from both ends of each component (L refers to the total length of the component).

[0057] II. Regularly check whether the travel limit switch and height limit switch are safe and reliable, and whether the limit block can reliably collide.

[0058] III. As it is a mobile device, there is mechanical vibration. It is necessary to regularly check whether there are any loose connections inside the control cabinet, mainly screws and wiring terminals.

[0059] IV. Start the machine regularly and check all mechanical and moving parts during operation to ensure they are functioning properly.

[0060] V. All extended cylinder piston rods should be protected during operation to prevent collisions or burns from electric welding.

[0061] VI. The guide rollers and baffles on both sides of the slide should be inspected before each movement. If any cracks or detachments are found in the welds, they should be repaired immediately.

[0062] VII. The installed oil pipeline must not be stepped on or kicked, to prevent the joints from loosening and causing oil leakage.

[0063] VIII. For overhead cranes, the lubrication method primarily employs distributed lubrication. Therefore, it is essential to regularly check the grease fittings and oil lines to ensure they are unobstructed and to replenish the lubricating oil. For bearings, hook pulleys, stationary pulleys, and other rolling bearings, select an appropriate grade of calcium-based grease based on the local temperature. Sewing machine oil can be used for the moving pins of the brakes and other operating systems. The lubricating oil in the reducer should be selected according to the season, and the oil level should always be maintained at the level indicated by the needle pin.

[0064] IX. When more than 5% of the wires in a wire rope are broken, or when 10% of the surface is worn, it should be replaced in a timely manner.

[0065] X. Lifting equipment must be inspected regularly. If any cracks, breaks, or deformations are found in the main load-bearing components, pins, or pulley frames (welding repair is strictly prohibited), the equipment should be scrapped immediately and replaced with new parts.

[0066] XI. There shall be no cracks on the wheel. If the wear of the wheel flange exceeds 30% of the original thickness or if the wheel flange is chipped, the wheel shall be replaced. The deviation of the working diameter of the two matching drive wheels caused by uneven wear shall not exceed 1 / 600 of their nominal diameter. If it exceeds this amount, the wheel shall be re-machined and heat-treated. If the wheel diameter is 10mm smaller than the original diameter, the wheel shall be replaced.

[0067] The above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention without departing from the spirit and scope of the present invention. Any modifications or partial substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for bridge erecting machine to switch between two-span and three-span bridge spans and to perform variable-amplitude construction, characterized by: Follow these steps: (a) Construction preparation; (ii) Preparation for the bridge erecting machine to pass through the span: add a temporary pier top bracket on the outside of the cap beam of the front pier (P26); (iii) Lateral adjustment of the main beam at the front middle support leg of the bridge erecting machine; (iv) Initial longitudinal movement of the main beam by the bridge erecting machine; (v) Replace and anchor the front and rear middle outriggers; (vi) Secondary longitudinal movement of the main beam of the bridge erecting machine; (vii) The rear middle outrigger is disengaged and moved laterally to be supported on the temporary pier top bracket; (viii) The main beam at the rear middle support leg of the bridge erecting machine is adjusted laterally to complete the conversion of the bridge erecting machine from two bridges to three bridges passing through the span; (ix) Complete the erection of two of the bridge sections; (x) The right-side bridge erecting machine withdraws from the hole; (xi) The right-side bridge erecting machine moves laterally to change its span and erects the middle span bridge across the span; (xii) Repeat the span crossing and span-changing girder erection steps in the order of amplitude change to complete the erection of the remaining three bridge spans.

2. The method for bridge erection machine to switch from two-span to three-span bridge spans and perform variable-amplitude construction according to claim 1, characterized in that: The temporary pier top support includes a base and two steel pipes. The base is reinforced with first anchor threaded steel bars that are anchored to the outside of the cap beam of the front pier (P26). The first anchor threaded steel bars are threaded with first fastening nuts that are tightly pressed against the upper surface of the base. The two steel pipes are arranged vertically side by side. The lower ends of the two steel pipes are welded and fixed to the upper surface of the base. The upper ends of the two steel pipes are welded and fixed with supports. The supports are fixed with hinge seats on three sides. The hinge seats are hinged with struts. The lower ends of the struts are hinged with fixed seats. The fixed seats are reinforced with second anchor threaded steel bars that are anchored to the outside of the cap beam of the front pier (P26). The second anchor threaded steel bars are threaded with second fastening nuts that are tightly pressed against the upper surface of the fixed seats.

3. The method for bridge erection machine to switch from two-span to three-span bridge spans and to perform variable-amplitude construction according to claim 2, characterized in that: Step (1) specifically involves: providing technical and safety briefings to construction workers on the conversion of the bridge erecting machine from two spans to three spans and the variable-amplitude construction, informing them of potential hazards and corresponding emergency measures, and inspecting the construction equipment and high-altitude operation protection measures before construction to ensure normal operation.

4. The method for bridge erection machine to switch from two-span to three-span bridge spans and perform variable-amplitude construction according to claim 3, characterized in that: Step (II) is as follows: Based on the on-site survey and stress calculation, a pair of temporary pier top brackets are added at the corresponding distance on the outside of the front pier (P26) cap beam. The two temporary pier top brackets correspond one-to-one with the left and right bridge erecting machines, respectively. The position, depth and preload of the first and second anchoring threaded steel bars of the temporary pier top brackets are determined according to the calculation sheet. A pair of front auxiliary support leg brackets are installed on the top of the pre-pier (P25) cap beam in the direction of the large mileage. The two front auxiliary support leg brackets correspond one-to-one with the left and right bridge erecting machines, so that the overhead cranes on the two bridge erecting machines are moved to the tail of the corresponding bridge erecting machines to prepare for crossing the span. Before crossing the span, check whether the front and rear middle support legs of the corresponding bridge erecting machines have been anchored, and measure the longitudinal slope of the main beam of the bridge erecting machine. Based on the measurement data and the top elevation of the pre-pier (P25), calculate the height adjustment required for each support leg of the bridge erecting machine. Adjust the height of the front and rear auxiliary support legs by adjusting the oil cylinders on the sides of the front and rear auxiliary support legs and the spiral jacks at the bottom. At the same time, adjust the height of the front and rear middle support legs by adjusting the support oil cylinders at the bottom of the front and rear middle support legs. Step (3) specifically involves: releasing the locking of the main beam of the bridge erecting machine to the crossbeam pin of the front middle support leg, releasing the locking of the jacking cylinder and anchor rod of the front middle support leg to the main beam of the bridge erecting machine, and moving the main beam of the bridge erecting machine laterally through the lateral movement cylinder of the front middle support leg to achieve the purpose of rotating the main beam of the bridge erecting machine with the rear middle support leg as the axis; after calculation and adjustment based on the actual site conditions, the main beam at the position of the front middle support leg of the left bridge erecting machine is finally moved laterally to the outside of the cap beam to a position 2535mm away from the center line of the left beam, and the main beam at the position of the front middle support leg of the right bridge erecting machine is moved laterally to the outside of the cap beam to a position 3300mm away from the center line of the right beam.

5. The method for bridge erection machine to switch from two-span to three-span bridge spans and to perform variable-amplitude construction according to claim 4, characterized in that: Step (iv) is as follows: The operation of the two bridge erecting machines is the same. Therefore, only the longitudinal movement step of the main beam of the bridge erecting machine is described: retract the rear auxiliary leg and hang it on the main beam of the bridge erecting machine. Release the locking of the jacking cylinder of the rear middle leg to the main beam of the bridge erecting machine. Connect the jacking cylinder of the front middle leg to the main beam of the bridge erecting machine. Start the jacking cylinder of the front middle leg to make the main beam of the bridge erecting machine begin to move longitudinally. When the front auxiliary leg reaches the corresponding front auxiliary leg bracket anchor point on the top of the cap beam of the advanced pier (P25), stop the longitudinal movement and anchor the front auxiliary leg to the top of the cap beam of the advanced pier (P25) through the front auxiliary leg bracket anchor point.

6. The method for bridge erection machine to switch from two-span to three-span bridge spans and perform variable-amplitude construction according to claim 5, characterized in that: Step (5) is as follows: the rear auxiliary support leg supports the bridge erecting machine, the rear middle support leg is detached from the rear pier (P27) cap beam, and the rear middle support leg is lifted by a crane to the rear of the front middle support leg to support the bridge erecting machine, so that the rear middle support leg is anchored to the bridge deck through the pre-embedded anchor points. Then, the front and middle support legs are suspended in the air. The bridge erecting machine is supported by the front auxiliary support legs, the rear auxiliary support legs, and the rear middle support legs. The front and middle support legs are lifted and moved to the anchorage point of the pre-pier (P25) cap beam by the overhead crane and anchored.

7. The method for bridge erection machine to switch from two-span to three-span bridge spans and perform variable-amplitude construction according to claim 6, characterized in that: Step (six) is as follows: retract the front and rear auxiliary legs, so that the front and rear auxiliary legs are suspended on the main beam of the bridge erecting machine, and remove the front auxiliary leg bracket; move the gantry crane as a counterweight to the mid-span of the front pier (P26) and the advanced pier (P25), and the whole machine is converted to the through-span state; connect the jacking cylinder of the rear middle support leg to the main beam of the bridge erecting machine; release the jacking cylinder of the front middle support leg from the main beam of the bridge erecting machine; start the jacking cylinder of the rear middle support leg; and push the bridge erecting machine to continue to move forward longitudinally until all the beam hanging points of the main beam of the bridge erecting machine are completely located between the front and rear middle support legs.

8. The method for bridge erection machine to switch from two-span to three-span bridge spans and perform variable-amplitude construction according to claim 7, characterized in that: Step (VII) is as follows: Release the locking between the main beam of the bridge erecting machine and the front and rear middle support legs, release the locking between the front and rear middle support leg push cylinders and the main beam of the bridge erecting machine, so that the main beam at the rear middle support leg of the left bridge erecting machine moves laterally to the inside of the cap beam to 2030mm from the center line of the left beam, so that the main beam at the rear middle support leg of the right bridge erecting machine moves laterally to the inside of the cap beam to 2100mm from the center line of the right beam, move the rear auxiliary support leg of the left bridge erecting machine forward to 12450mm from the rear middle support leg, move the rear auxiliary support leg of the right bridge erecting machine forward to 7585mm from the rear middle support leg, and shift the rear auxiliary support leg as inward as possible relative to the main beam; Next, the rear auxiliary outriggers support the bridge erecting machine and anchor it to the bridge deck. The rear middle outriggers are then retracted and detached. The rear middle outriggers are moved by the overhead crane to the original position of the front middle outriggers and kept in a detached state. The front and rear middle outriggers' push cylinders are locked to the main beam. Using the rear middle outriggers' lateral movement cylinders, the rear middle outriggers of the left and right bridge erecting machines are moved laterally to the outside of the cap beam relative to the main beam until the outer cylinders of the rear middle outriggers land on the corresponding temporary pier top brackets. After the lateral movement is completed, the main beam of the left bridge erecting machine is 2170mm away from the center line of the left beam, and the main beam of the right bridge erecting machine is 2360mm away from the center line of the right beam.

9. The method for bridge erection machine to switch from two-span to three-span bridge spans and perform variable-amplitude construction according to claim 8, characterized in that: Step (8) is as follows: detach the rear auxiliary support leg and move it to the center line of the main beam. Using the front middle support leg as the axis, rotate the bridge erecting machine horizontally at a certain angle. Use the rear middle support leg lateral movement cylinder to move the main beam at the rear middle support leg of the left bridge erecting machine laterally to the outside of the cap beam to a position 3190mm away from the center line of the left beam. Move the main beam at the rear middle support leg of the right bridge erecting machine laterally to the outside of the cap beam to a position 3250mm away from the center line of the right beam. Next, the main beam is moved laterally. The main beam at the rear middle support leg of the left bridge erecting machine is moved laterally to the outside of the cap beam to a position 7300mm from the center line of the left beam. The main beam at the rear middle support leg of the right bridge erecting machine is moved laterally to the outside of the cap beam to a position 6360mm from the center line of the right beam. The bridge erecting machine has now completed the transition from two bridge spans to three bridge spans. The gantry crane returns to the mid-span of the front pier (P26) and the advanced pier (P25). Then, the longitudinal slope of the main beam of the bridge erecting machine is re-measured. If the longitudinal slope of the main beam of the bridge erecting machine exceeds 2%, the height of the front and rear auxiliary support legs is adjusted by adjusting the hydraulic cylinders on the sides of the front and rear auxiliary support legs and the spiral jacks at the bottom. At the same time, the height of the front and rear middle support legs is adjusted by adjusting the support hydraulic cylinders at the bottom of the front and rear middle support legs. The overall height of the machine is adjusted. The beam can only be hung when the longitudinal slope of the main beam of the bridge erecting machine is within 2%.

10. The method for bridge erection machine to switch from two-span to three-span bridge spans and to perform variable-amplitude construction according to claim 9, characterized in that: Step (nine) is as follows: According to the designed girder erection plan, first erect the left and right spans of the bridge between the front pier (P26) and the super-front pier (P25). The segmental beams are transported to the designated location. The No. 1 segment is lifted by a crane to the designed position of the cap beam of the super-front pier (P25). φ40mm precision-rolled threaded steel is used to suspend it on the main beam. Then, the crane lifting equipment is released to complete the conversion. The crane is driven away. The remaining segmental beams are lifted and suspended sequentially from the super-front pier (P25) to the front pier (P26) to complete the beam lifting and the erection of the left and right spans of the bridge between the front pier (P26) and the super-front pier (P25). A pair of front auxiliary support brackets are installed on the top of the cap beam of the super-super-front pier (P24) in the direction of the largest mileage to prepare for the bridge erection machine to continue passing through the span.

11. The method for bridge erection machine to switch from two-span to three-span bridge spans and perform variable-amplitude construction according to claim 10, characterized in that: Step (10) is as follows: After the right span bridge erecting machine completes the erection of the right span bridge between the front pier (P26) and the advanced front pier (P25), the right span bridge erecting machine retracts to the space between the rear pier (P27) and the front pier (P26) to prepare for the right span bridge erecting machine to move laterally to the middle span. The process of retracting the right-side bridge erecting machine from the hole is the same as the previous hole-passing steps, but the operation is reversed to allow the right-side bridge erecting machine to retract to the original hole-passing position.

12. The method for bridge erection machine to switch from two-span to three-span bridge spans and perform variable-amplitude construction according to claim 11, characterized in that: Step (XI) is as follows: After the right span bridge erecting machine retreats to the space between the rear pier (P27) and the front pier (P26), the right span bridge erecting machine moves laterally and passes through the space to the middle span between the front pier (P26) and the advanced pier (P25) to erect the middle span bridge between the front pier (P26) and the advanced pier (P25). By following the above-mentioned construction method of converting two span bridges to three span bridges through the space, the right span bridge erecting machine can reach the middle span between the front pier (P26) and the advanced pier (P25). In addition, after the left-side bridge crane erects the left-side bridge between the front pier (P26) and the super-front pier (P25), it directly erects the left-side bridge between the super-front pier (P25) and the super-super-front pier (P24) through the span.

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