Super-long section splicing bridge girder erection machine and bridge construction method based on super-long section splicing bridge girder erection machine

Abstract

The invention discloses a super-long section-spliced bridge girder erection machine and a bridge construction method based on the super-long section-spliced bridge girder erection machine, and construction can be carried out by adopting a method of synchronously implementing different working procedures according to different working conditions. Comprising the steps of double-T-structure and side-span semi-suspension synchronous construction, double-T-structure synchronous construction, T-structure and side-span semi-suspension synchronous construction, transition pier side-span tail-span and side-span head-span (false-T-structure symmetrical suspended splicing) synchronous construction, double-span full-suspension synchronous construction and the like. Multiple working procedures can be synchronously combined for construction, so that the construction efficiency can be greatly improved, the construction period and the cost are saved, and the universal applicability is realized. Meanwhile, the function of semi-suspension of the front end of the main beam of the section-spliced bridge girder erection machine is achieved, the bridge girder erection machine can conduct semi-suspension construction of each last span without crossing the span, the super-long section-spliced bridge girder erection machine further has the function of continuously crossing two spans at a time, the construction efficiency is greatly improved, and the construction period and cost are saved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to an ultra-long section bridge erecting machine and a bridge construction method based on the ultra-long section bridge erecting machine. Background Art

[0002] The process of factory-based and assembled construction of prefabricated concrete beams is becoming more and more common in highway or bridge construction, and the use of segmental assembly bridge-building machines is also increasing. Conventional segmental assembly bridge-building machines can generally only cover about two and a half spans of a bridge. According to different working conditions, different processes are implemented one by one for construction.

[0003] Take a three-span bridge as an example. First, the first T-structure is symmetrically suspended, then the side span is half-suspended, the first span is closed and the bridge-erecting machine passes over the span, then the second T-structure is symmetrically suspended, the second span is closed and the bridge-erecting machine passes over the span, and finally the remaining half of the section is constructed. After the third span is closed, the bridge-erecting machine passes over the span to construct the next section, and so on. All processes need to be completed separately, and cannot be parallelized or crossed, resulting in low efficiency and a long construction period. Summary of the invention

[0004] Based on this, it is necessary to provide an ultra-long section bridge erection machine and a bridge construction method based on the ultra-long section bridge erection machine in response to the existing bridge construction method, in which all processes need to be completed separately, resulting in low work efficiency and long construction period.

[0005] An ultra-long section bridge erecting machine, comprising:

[0006] A main beam, wherein the main beam has the same strength along the length direction so that the front end of the main beam can be semi-suspended;

[0007] Two sets of front legs are installed at the front end of the main beam, and the two sets of front legs have a first state in which they stand separately, and a second state in which the two sets of front legs are connected to stand as a whole;

[0008] Three sets of middle legs are installed on the main beam, and the three sets of middle legs are used to stand on the piers to support the main beam;

[0009] A rear support leg, mounted on the rear end of the main beam;

[0010] at least two overhead cranes mounted on the top of the main beam and capable of moving along the main beam; and

[0011] A hanging assembly is installed on the main beam, and the hanging assembly is used to hang the segmental beam.

[0012] In one embodiment, the length of the main beam covers at least three spans of the bridge.

[0013] A bridge construction method based on any one of the above-mentioned super-long section bridges, the bridge comprises a plurality of piers, the plurality of piers comprises two side piers located at the head and the tail, a transition pier supporting two adjacent bridges, and an intermediate pier between the transition pier and the side piers, the two side piers are respectively a head side pier and a tail side pier, the construction method comprises the following steps:

[0014] Temporarily consolidate the two pier top blocks on the transition pier into a whole;

[0015] Symmetrically assembling the segmental beams on both sides of the middle pier of the first span and the second span in sequence, and synchronously assembling the segmental beams of the first side pier in sequence;

[0016] The bridge erection machine moves longitudinally over two spans, and sequentially and symmetrically assembles the segmental beams on both sides of two adjacent piers, and repeats this step until the middle pier and the tail pier of the remaining span remain;

[0017] The segmental beams on both sides of the middle pier of the last span are assembled symmetrically in sequence, and the segmental beams of the tail pier are assembled synchronously in sequence;

[0018] Release the temporary consolidation of the two pier top blocks on the transition pier.

[0019] In one embodiment, the step of temporarily consolidating two pier top blocks on the transition pier into a whole is specifically as follows:

[0020] The bridge erection machine erects two pier top blocks of the transition pier, ties up the inner cavity steel bars of the two pier top blocks, closes the formwork and casts concrete in the cavity to form a pier-beam consolidation system;

[0021] The end surface between the two pier top blocks of the transition pier is covered with a plastic film and closely attached to the end surface, and then the gap is closed with a template and poured with cement mortar to eliminate the gap between the two pier top blocks;

[0022] The segmental beams are installed in a symmetrical manner on the left and right, and the temporary prestressed steel strands between the two segmental beams are tensioned symmetrically in turn to temporarily lock the two transition piers together.

[0023] In one embodiment, the steps of symmetrically assembling the segmental beams on both sides of the middle pier of the first span and the second span in sequence, and synchronously assembling the segmental beams of the first side pier in sequence are specifically:

[0024] The segment beams on both sides of the middle pier of the first span and the second span are synchronously and symmetrically hoisted and spliced ​​by an overhead crane, positioning and adjusting, gluing the joints, tensioning temporary prestressed steel bars of two adjacent segments, and then tensioning the permanent prestressed steel strands between the segment beams in turn, and the overhead crane is unloaded;

[0025] The segment beams of the first pier are synchronously suspended under the main beam of the bridge erection machine by using an overhead crane, positioning and adjusting, gluing the joints, and tensioning temporary prestressed steel bars;

[0026] The formwork is closed at the wet joint and concrete is poured. After the concrete strength reaches the required level, permanent prestressed steel strands are tensioned between the middle pier and the first side pier and between the two middle piers.

[0027] In one embodiment, the steps of sequentially and symmetrically assembling the segmental beams on both sides of two adjacent bridge piers are specifically as follows:

[0028] The segment beams on both sides of two adjacent piers are synchronously and symmetrically hoisted and spliced ​​by overhead cranes, positioning and adjusting, gluing the joints, and tensioning the temporary prestressed steel bars of the two adjacent segments;

[0029] Then the permanent prestressed steel strands between the segment beams are tensioned in sequence, and the overhead crane is unloaded;

[0030] The formwork is closed at the wet joint and concrete is poured. After the concrete strength reaches the required level, permanent prestressed steel strands are tensioned between the first pier and the previous pier and between two adjacent piers.

[0031] In one embodiment, the steps of symmetrically assembling the segmental beams on both sides of the middle pier of the last span in sequence and synchronously assembling the segmental beams of the tail pier in sequence are specifically:

[0032] The segment beams of the tail pier are sequentially suspended under the main beam of the bridge erection machine by using an overhead crane, positioning and adjusting, gluing the joints, and tensioning temporary prestressed steel bars;

[0033] Two overhead cranes are used to synchronously and symmetrically lift and splice the segment beams on both sides of the middle pier of the last span, position and adjust, glue the joints, tension the temporary prestressed steel bars of the two adjacent segments, and then tension the permanent prestressed steel strands between the segment beams in turn, and the overhead crane is unloaded;

[0034] The formwork is closed at the wet joint and concrete is poured. After the concrete strength reaches the required level, the permanent prestressed steel strands are tensioned between the middle pier of the last span and the previous pier and between the middle pier of the last span and the tail pier.

[0035] In one embodiment, the step of releasing the temporary consolidation of the two pier top blocks on the transition pier is specifically:

[0036] The prestressed steel tendons between the segment beams are sequentially stretched and extracted symmetrically on the left and right sides, and then the prestressed steel bars are stretched and extracted;

[0037] A rope saw is used to cut the mortar layer between the two pier top blocks on the transition pier. After a circumferential seam is cut in the mortar layer, the mortar layer will automatically fall off because the end surface of the pier top block is covered with a plastic film, and the temporary consolidation system is released.

[0038] A bridge construction method based on any one of the above-mentioned super-long section assembled bridges comprises the following steps:

[0039] The overhead crane is used to synchronously hang the segment beams of the first span and the second span under the main beam of the bridge erection machine, position and adjust, glue the joints, and tension the temporary prestressed steel bars;

[0040] Close the formwork at the joints and pour concrete, and tension the permanent prestressed steel strands of the first and second spans;

[0041] The bridge erecting machine moves longitudinally across two spans and the above steps are repeated until the full suspension construction of the bridge is completed.

[0042] In one embodiment, the steps of longitudinally moving the bridge erecting machine over two spans are specifically as follows:

[0043] Release the longitudinal restraint of the main beam, start the longitudinal movement cylinder of the middle outrigger, and push the main beam to move longitudinally across the span;

[0044] The connection between the two front legs is released, the first front leg is moved forward to the bracket on the side of the next pier and supports the main beam, and the second front leg is moved forward to the bracket on the side of the pier and supports the main beam;

[0045] The overhead crane hoists a middle outrigger to the top of the pier where the second front outrigger is located, installs anchors and supports the main beam;

[0046] The second front outrigger moves to the top of the next pier and connects with the first front outrigger as a whole;

[0047] Release the longitudinal restraint of the main beam, start the longitudinal movement cylinder of the middle outrigger, and push the main beam to move longitudinally across the span;

[0048] The connection between the two front legs is released, the first front leg is moved forward to the bracket on the side of the next pier and supports the main beam, and the second front leg is moved forward to the bracket on the side of the pier and supports the main beam;

[0049] The overhead crane hoists a middle outrigger to the top of the pier where the second front outrigger is located, installs anchors and supports the main beam;

[0050] The second front outrigger moves to the top of the next pier and connects with the first front outrigger as a whole, and the longitudinal movement of the bridge-erecting machine is completed by two spans.

[0051] The above-mentioned super-long section bridge-building machine and the bridge construction method based on the super-long section bridge-building machine can be constructed according to different working conditions by using different methods of simultaneous implementation of different processes, including: simultaneous construction of double T-structures and semi-suspension of side spans, simultaneous construction of double T-structures, simultaneous construction of T-structures and semi-suspension of side spans, simultaneous construction of the last span of the side span of the transition pier and the first span of the side span (symmetrical suspension of false T-structures), and simultaneous construction of double spans with full suspension. Multiple processes can be combined for construction simultaneously, which can greatly improve construction efficiency, save construction time and costs, and has universal applicability. At the same time, the function of semi-suspension of the front end of the main beam of the section bridge-building machine is realized. The bridge-building machine can perform semi-suspension construction of the last span of each joint without crossing the span. The super-long section bridge-building machine also has the function of crossing 2 spans continuously at one time, which greatly improves construction efficiency and saves construction time and costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0053] Figure 1 It is a structural schematic diagram of an ultra-long section bridge erection machine in one embodiment;

[0054] Figure 2 A flow chart of a bridge construction method based on an ultra-long section bridge erection machine in one embodiment;

[0055] Figure 3 It is a schematic diagram of a double-linked three-span bridge;

[0056] Figure 4 This is a schematic diagram of temporary consolidation of the top block of the transition pier;

[0057] Figure 5 Schematic diagram of the extra-long section bridge erection machine station located on the bridge pier;

[0058] Figure 6 This is a schematic diagram of the middle outrigger being hoisted to the (n+2) pier and the front outrigger being connected as a whole;

[0059] Figure 7 It is a schematic diagram of symmetrically hoisting and splicing the (n+1) pier and the (n+2) pier 1# block, and hoisting and hanging the (n+0) pier 1# block;

[0060] Figure 8 It is a schematic diagram of symmetrically hoisting and splicing the (n+1) pier and the (n+2) pier 2# block, and hoisting and hanging the (n+0) pier 2# block;

[0061] Fig. 9 It is a schematic diagram of symmetrically hoisting and splicing the remaining segments of the (n+1) pier and the (n+2) pier in sequence, and hoisting and hanging the remaining segments of the (n+0) pier;

[0062] Fig.10 This is a schematic diagram of the hoisting and hanging of the (n+0) pier 8# block;

[0063] Fig.11 Schematic diagram of closing the formwork and pouring concrete for the wet joint;

[0064] Fig.12 This is a schematic diagram of the main beam of the bridge erection machine moving longitudinally across the span;

[0065] Fig.13 It is a schematic diagram of the 1# front outrigger moving forward to the (n+4) pier side bracket and the 2# front outrigger moving forward to the (n+3) pier side bracket;

[0066] Fig.14 This is a schematic diagram of the beam transport vehicle carrying the 2# middle leg to the (n+1) pier;

[0067] Fig.15 This is a schematic diagram of the 2# middle outrigger being hoisted to the (n+3) pier and the 2# front outrigger moving to the top of the (n+4) pier to be connected as a whole;

[0068] Fig.16 This is a schematic diagram of the main beam of the bridge erection machine moving longitudinally across the span;

[0069] Fig.17 It is a schematic diagram of the 1# front outrigger moving forward to the (n+5) pier side bracket and the 2# front outrigger moving forward to the (n+4) pier side bracket;

[0070] Fig.18 It is a schematic diagram of the 2# middle outrigger being transferred to the (n+2) pier, the 1# middle outrigger being transferred to the (n+4) pier, and the front outrigger being connected as a whole at the (n+5) pier;

[0071] Fig.19 This is a schematic diagram of the symmetrical lifting and splicing of the (n+3) pier and (n+4) pier 1# block;

[0072] Fig. 20 This is a schematic diagram of the symmetrical lifting and splicing of the remaining segments of the (n+3) pier and the (n+4) pier;

[0073] Fig.21 Schematic diagram of closing the formwork and pouring concrete for the wet joint;

[0074] Fig. 22 This is a schematic diagram of the main beam of the bridge erection machine moving longitudinally across the span;

[0075] Fig.23 It is a schematic diagram of the front outriggers being connected as a whole at the (n+6) pier and the 3# middle outriggers being moved forward to the (n+5) pier;

[0076] Fig.24It is a schematic diagram of hoisting and hanging (n+6) pier 1# block and symmetrically hoisting and splicing (n+5) pier 1# block;

[0077] Fig.25 Schematic diagram of hoisting and hanging the remaining segments of the (n+6) pier and symmetrically hoisting and splicing the remaining segments of the (n+5) pier;

[0078] Fig.26 Schematic diagram of closing the formwork and pouring concrete for the wet joint;

[0079] Fig. 27 It is a schematic diagram of tensioning temporary prestressed steel bars and temporary prestressed steel tendons between segments;

[0080] Fig.28 is the distribution diagram of temporary prestressed steel bars and temporary prestressed steel tendons on the cross section of the segmental beam;

[0081] Fig.29 A flow chart of a bridge construction method based on an ultra-long section bridge erection machine in another embodiment;

[0082] Fig.30 Schematic diagram of the extra-long section bridge erection machine station located on the bridge pier;

[0083] Fig.31 This is a schematic diagram of the 3# middle outrigger standing at the (n+2) pier and the front outrigger connected as a whole at the (n+3) pier;

[0084] Fig.32 This is a schematic diagram of hoisting and suspending the first span and the second opening 1# block;

[0085] Fig.33 Schematic diagram of hoisting and hanging the remaining sections of the first span and the second opening;

[0086] Fig.34 Schematic diagram of closing the formwork and pouring concrete for the wet joint;

[0087] Fig.35 This is a schematic diagram of the unloading of the bridge crane hanging system;

[0088] Fig.36 This is a schematic diagram of the main beam of the bridge erection machine moving longitudinally across the span;

[0089] Fig.37 It is a schematic diagram of the 1# front outrigger moving forward to the (n+4) pier side bracket and the 2# front outrigger moving forward to the (n+3) pier side bracket;

[0090] Fig.38 This is a schematic diagram of the beam transport vehicle carrying the 2# middle leg to the vicinity of the (n+1) pier;

[0091] Fig.39It is a schematic diagram of the 2# middle outrigger station being located on the (n+3) pier and the front outrigger being connected as a whole at the (n+4) pier;

[0092] Fig.40 This is a schematic diagram of the main beam of the bridge erection machine moving longitudinally across the span;

[0093] Fig.41 This is a schematic diagram of the 1# middle outrigger standing at the (n+4) pier and the front outrigger connected as a whole at the (n+5) pier;

[0094] Fig.42 Schematic diagram of the bridge-erecting machine completing the construction of the third and fourth spans.

[0095] Reference numerals:

[0096] 10-super-long section bridge erecting machine, 11-main beam, 12-front outrigger, 13-middle outrigger, 14-overhead crane, 15-suspension assembly, 16-wet joint, 21-forward pier, 22-rear pier, 23-transition pier, 24-middle pier, 31-plastic film, 32-mortar. DETAILED DESCRIPTION

[0097] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the invention is not limited by the specific implementation disclosed below.

[0098] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0099] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0100] See also Figure 1 In one embodiment, the super-long section bridge erection machine 10 includes a main beam 11, two sets of front legs 12, three sets of middle legs 13, rear legs (not shown), at least two overhead cranes 14 and a hanging assembly 15.

[0101] The main beam 11 has the same strength along the length direction, and the main beam 11 adopts an equal strength design so that the front end of the main beam 11 can be semi-suspended. In one embodiment, the length of the main beam 11 covers at least three spans of the bridge so that the bridge erection machine can construct two spans of the bridge at the same time. In this embodiment, the length of the main beam 11 covers about three and a half spans of the bridge.

[0102] Two sets of front legs 12 are installed at both ends of the main beam 11. The two sets of front legs 12 have a first state in which they stand separately and a second state in which the two sets of front legs 12 are connected as a whole. The two sets of front legs 12 can stand separately to support the main beam 11, so that the super-long section bridge erecting machine 10 can cross the span. The two sets of front legs 12 can also be connected as a whole to stand at one point, which can facilitate the front end of the bridge erecting machine to achieve semi-suspension construction. Among them, the front legs 12 can be supported on the ground or the pedestal, and the front legs 12 can also be supported on the pier side bracket.

[0103] Three sets of middle legs 13 are installed on the main beam 11. The three sets of middle legs 13 stand on the pier to support the main beam 11. Since the main beam 11 is relatively long, three sets of middle legs 13 are used to support it to ensure the stability of the bridge erection machine. The rear legs are installed at the rear end of the main beam 11. The rear legs are used to support the rear end of the main beam 11 to ensure the stability of the main beam 11 from front to back.

[0104] At least two overhead cranes 14 are installed on the top of the main beam 11, and the overhead cranes 14 can move on the main beam 11 so that the segmental beams and legs hoisted by the overhead cranes 14 can adjust their positions. In one embodiment, the super-long section bridge erection machine 10 has four overhead cranes 14, and the four overhead cranes 14 cooperate to achieve synchronous construction between T-structures and between T-structures and semi-suspensions. The hanging assembly 15 is installed on the main beam 11, and the hanging assembly 15 is used to hang the segmental beam to achieve the hanging construction of the segmental beam.

[0105] See also Figure 2 and Figure 3 The present invention also provides a bridge construction method based on the above-mentioned super-long section bridge erection machine 10, wherein the bridge comprises a plurality of bridge piers, the plurality of bridge piers comprising two side piers at the head and tail, a transition pier 23 supporting two adjacent bridges, and an intermediate pier 24 between the transition pier 23 and the side piers, wherein the two side piers are respectively a head side pier 21 and a tail side pier 22. The construction method specifically comprises the following steps:

[0106] Step S110: temporarily consolidating the two pier top blocks on the transition pier 23 into a whole.

[0107] Please also read Figure 4Specifically, since the top 0# blocks of the transition pier 23 are separated, the conditions for symmetrical T-structure splicing are not met. The present invention creates the conditions for symmetrical T-structure splicing by temporarily pulling and locking the segment beams of the transition pier 23. After the symmetrical T-structure splicing and permanent prestressing of the entire span are completed, the system is transformed, the temporary locking is released, and the bridge state is restored.

[0108] The steps of temporarily consolidating the two pier top blocks on the transition pier 23 into a whole are specifically as follows: the bridge erection machine erects the two pier top blocks on the two transition piers 23, ties the inner cavity steel bars of the two pier top blocks, closes the formwork and casts the concrete in the cavity to form a pier-beam consolidation system; the end face between the two pier top blocks of the transition pier 23 is covered with a plastic film 31 and tightly adheres to the end face, then the gap is closed with a formwork and cement mortar 32 is poured to eliminate the gap between the two pier top blocks; the segmental beams are installed in a left-right symmetrical manner in sequence, and the temporary prestressed steel strands between the two segmental beams are tensioned symmetrically in sequence to temporarily lock the two transition piers 23 together.

[0109] Step S120: symmetrically assembling the segmental beams on both sides of the middle pier 24 of the first span and the second span in sequence, and synchronously assembling the segmental beams of the first side pier 21 in sequence.

[0110] Specifically, this step performs the synchronous construction of the double T structure and the side span semi-suspension. In one embodiment, the overhead crane 14 is used to synchronously and symmetrically lift and splice the segmental beams on both sides of the middle pier 24 of the first span and the second span, position and adjust, glue the joints, and tension the temporary prestressed steel bars of the adjacent segments. Then, the permanent prestressed steel strands between the segmental beams are tensioned in sequence, and the overhead crane 14 is unloaded.

[0111] The overhead crane 14 is used to synchronously suspend the segment beams of the first side pier 21 under the main beam 11 of the bridge erection machine, position and adjust, glue the joints, and tension the temporary prestressed steel bars. After the segment beams are assembled, the wet joints 16 are closed and concrete is poured. After the concrete strength reaches the required level, the permanent prestressed steel strands are tensioned between the intermediate pier 24 and the first side pier 21 and between the two intermediate piers 24.

[0112] Specifically, in this embodiment, in order to understand the technical solution of the present invention, a double-bridge is taken as an example for introduction. Each bridge has three spans, and (n+3) is a transition pier 23. The steps of synchronous construction of the double T structure and the side span semi-suspension are as follows:

[0113] Please also read Figure 5 Step 1: The super-long section bridge erecting machine 10 is in place. The two front legs 12 of the bridge erecting machine are respectively located on the (n+2) pier and the (n+3) pier, one middle leg 13 is located on the (n+1) pier, and the other two middle legs 13 are located on the (n+0) pier.

[0114] Please also read Figure 6Step 2: (1) The overhead crane 14 hoists the 3# middle leg 13 to the (n+2) pier and supports the main beam 11; (2) The 2# front leg 12 is retracted, and it moves to the top of the (n+3) pier to support the main beam 11 and connects with the 1# front leg 12 to form a whole; the bracket of the (n+2) pier is removed and transferred to the (n+4) pier for installation.

[0115] Please also read Figure 7 , Step 3: (1) 1# and 2# cranes 14 symmetrically hoist and splice (n+2) pier 1# blocks, adjust the position, apply glue to the joints, and tension the temporary prestressed steel bars of two adjacent sections; (2) 3# and 4# cranes 14 symmetrically hoist and splice (n+1) pier 1# blocks, adjust the position, apply glue to the joints, and tension the temporary prestressed steel bars of two adjacent sections; (3) Tension the permanent prestressed steel strands between (n+1) and (n+2) pier 1# blocks, and the crane 14 unloads; 4# crane 14 hoists and hangs (n+0) pier 1# block under the main beam 11 of the bridge erection machine, adjusts the position, and leaves a position for the wet joint 16.

[0116] Please also read Figure 8 , Step 4: (1) 1# and 2# cranes 14 symmetrically hoist and splice (n+2) pier 2# blocks, adjust the position, apply glue to the joints, and tension the temporary prestressed steel bars of the two adjacent sections; (2) 3# and 4# cranes 14 symmetrically hoist and splice (n+1) pier 2# blocks, adjust the position, apply glue to the joints, and tension the temporary prestressed steel bars of the two adjacent sections; (3) Tension the permanent prestressed steel strands between (n+1) and (n+2) pier 2# blocks, and the crane 14 unloads; (4) 4# crane 14 hoists and hangs (n+0) pier 2# block under the main beam 11 of the bridge erection machine, adjusts the position, applies glue to the joints, and tensions the temporary prestressed steel bars between 1# and 2# blocks.

[0117] Please also read Fig. 9 Step 5: (1) Symmetrically hoist and splice the remaining segments of the (n+1) pier and the (n+2) pier in sequence, and tension the temporary prestressed steel bars of the two adjacent segments; (2) Tension the permanent prestressed steel strands between the 3#~8# blocks of the (n+1) pier and the (n+2) pier in sequence, and unload the overhead crane 14; (3) The 4# overhead crane 14 sequentially suspends the 3#~7# segments of the (n+0) pier under the main beam 11 of the bridge erection machine, adjusts the positioning, applies glue to the joints, and tensions the temporary prestressed steel bars.

[0118] Please also read Fig.10 , Step 6: 4# overhead crane 14 hoists (n+0) pier 8# block and hangs it under the main beam 11 of the bridge erecting machine, positions and adjusts it, applies glue to the joint between the left side and the 7# block, tensions temporary prestressed steel bars, and leaves a wet joint 16 position on the right side.

[0119] Please also read Fig.11Step 7: (1) Close the formwork with three wet joints 16 and pour concrete; (2) After the concrete strength reaches the required level, tension the permanent prestressed steel strands between the (n+0) and (n+1) piers and between the (n+1) and (n+2) piers; (3) Unload the bridge crane hanging system.

[0120] Step S130: the bridge erecting machine moves longitudinally over two spans, and symmetrically assembles the segmental beams on both sides of two adjacent piers in sequence, and repeats this step until the middle pier 24 and the tail pier 22 of the remaining last span are left.

[0121] Specifically, after the bridge erection machine moves longitudinally over two spans, since the top block of the transition pier 23 has been temporarily consolidated as a whole in advance, it can be assembled symmetrically with the middle pier 24 in a T-structure. At this time, the middle pier 24 and the transition pier 23 are collectively referred to as bridge piers. Then, the construction of double T-structure symmetrical suspension assembly and synchronous erection (including false T-structure symmetrical suspension assembly) is carried out.

[0122] In one embodiment, the overhead crane 14 is used to synchronously and symmetrically hoist and splice the segment beams on both sides of two adjacent bridge piers, position and adjust, glue the joints, and tension the temporary prestressed steel bars of the two adjacent segments. Then, the permanent prestressed steel strands between the segment beams are tensioned in sequence, and the overhead crane 14 is unloaded. The wet joint 16 is closed and concrete is poured. After the concrete strength reaches the required level, the permanent prestressed steel strands are tensioned between the first bridge pier and the previous bridge pier, between the two adjacent bridge piers, and between the two adjacent bridge piers. The above steps are repeated until the remaining middle pier 24 and the tail pier 22 of the last span are left.

[0123] Specifically in this embodiment, the steps of the bridge erecting machine passing two spans at a time are specifically as follows:

[0124] Please also read Fig.12 , Step 8: Release the longitudinal constraint of the main beam 11, start the longitudinal movement cylinders of the 1# and 3# middle legs 13, and push the main beam 11 to move longitudinally across the span.

[0125] Please also read Fig.13 Step 9: (1) Release the connection between the 1# and 2# front legs 12, retract the 1# front leg 12 and move it forward to the (n+4) pier side bracket and support the main beam 11; (2) Retract the 2# front leg 12 and move it forward to the (n+3) pier side bracket and support the main beam 11.

[0126] Please also read Fig.14 , Step 10: The beam transport vehicle carries the 2# middle support leg 13 to the vicinity of the (n+1) pier.

[0127] Please also read Fig.15Step 11: (1) The overhead crane 14 hoists the 2# middle leg 13 to the top of the (n+3) pier for installation and anchoring; (2) The 2# front leg 12 is retracted and moves to the top of the (n+4) pier to support the main beam 11 and connects with the 1# front leg 12 as a whole; (3) The side bracket of the (n+3) pier is removed and moved to the (n+5) pier.

[0128] Please also read Fig.16 , Step 12: Release the longitudinal constraint of the main beam 11, start the longitudinal movement cylinders of the 2# and 3# middle legs 13, and push the main beam 11 to move longitudinally across the span.

[0129] Please also read Fig.17 Step 13: (1) Release the connection between the 1# and 2# front legs 12, retract the 1# front leg 12 and move it forward to the (n+5) pier side bracket; (2) Retract the 2# front leg 12 and move it forward to the (n+4) pier side bracket and support the main beam 11.

[0130] The specific steps for the synchronous erection of double T-structure symmetrical suspension assembly (including symmetrical suspension assembly of false T-structure) are as follows:

[0131] Please also read Fig.18 Step 14: (1) Fill the space between the top 0# blocks of the (n+3) pier with mortar 32 in advance for temporary consolidation; (2) The beam transport vehicle carries the 1# middle leg 13 to the vicinity of the (n+2) pier; (3) The overhead crane 14 hoists the 1# middle leg 13 to the (n+4) pier; (4) The 2# front leg 12 is folded up and moved forward to the top of the (n+5) pier and connected to the 1# front leg 12 as a whole; (5) The side bracket of the (n+4) pier is removed.

[0132] Please also read Fig.19 Step 15: (1) 1# and 2# overhead cranes 14 symmetrically hoist and splice (n+4) pier 1# blocks, adjust the positioning, apply glue to the joints, and tension the temporary prestressed steel bars of the two adjacent sections; (2) 3# and 4# overhead cranes 14 symmetrically hoist and splice (n+3) pier 1# blocks, adjust the positioning, apply glue to the joints, and tension the temporary prestressed steel bars of the two adjacent sections; (3) Tension the permanent prestressed steel strands between (n+4) and (n+3) pier 1# blocks, and unload the overhead crane 14.

[0133] Please also read Fig. 20 Step 16: (1) Symmetrically hoist and splice the remaining sections of the (n+4) pier and the (n+3) pier in sequence, and tension the temporary prestressed steel bars of the two adjacent sections; (2) Tension the temporary prestressed steel strands of the top plate of the symmetrically suspended T-structure between the 2#~8# blocks of the (n+3) pier in sequence, and unload the overhead crane 14; (3) Tension the permanent prestressed steel strands between the 2#~8# blocks of the (n+4) pier in sequence, and unload the overhead crane 14.

[0134] Please also read Fig.21Step 17: (1) Close the formwork and pour concrete at the two wet joints 16; (2) After the strength of the wet joints 16 reaches the required level, tension the permanent prestressed steel strands between the (n+2) and (n+3) piers and between the (n+3) and (n+4) piers; (3) Release the temporary top plate prestress of the (n+3) transition pier 23 pseudo-T structure, release the temporary consolidation mortar 32 between the two 0# blocks on the pier top, and complete the system conversion of the (n+3) transition pier 23 pseudo-T structure symmetrical cantilever structure.

[0135] Step S140: symmetrically assembling the segmental beams on both sides of the middle pier 24 of the last span in sequence, and synchronously assembling the segmental beams of the tail pier 22 in sequence.

[0136] Specifically, this step is to carry out the construction of T-structure and semi-suspension of the side span synchronously. In one embodiment, the overhead crane 14 is used to sequentially suspend the segmental beams of the tail side pier 22 under the main beam 11 of the bridge erection machine, position and adjust, glue the joints, and tension the temporary prestressed steel bars. Two overhead cranes 14 are used to synchronously and symmetrically lift and splice the segmental beams on both sides of the middle pier 24 of the last span, position and adjust, glue the joints, and tension the temporary prestressed steel bars of the two adjacent segments. Then, the permanent prestressed steel strands between the segmental beams are tensioned in turn, and the overhead crane 14 is unloaded. The formwork of the wet joint 16 is closed and concrete is poured. After the concrete strength reaches the requirement, the permanent prestressed steel strands between the middle pier 24 of the last span and the previous pier and between the middle pier 24 of the last span and the tail side pier 22 are tensioned.

[0137] Specifically in this embodiment, the steps of synchronously erecting the T-structure and the side span semi-suspension (including the semi-suspension of the front end of the main beam 11 of the bridge erection machine) are as follows:

[0138] Please also read Fig. 22 , Step 18: Release the longitudinal constraint of the main beam 11, start the longitudinal movement cylinders of the 1# and 2# middle legs 13, and push the main beam 11 to move longitudinally across the span.

[0139] Please also read Fig.23 Step 19: (1) Release the connection between the 1# and 2# front legs 12, retract the 1# front leg 12 and move it forward to the (n+6) pier side bracket and support the main beam 11; (2) Retract the 2# front leg 12 and move it forward to the (n+5) pier side bracket and support the main beam 11; (3) The beam transport vehicle carries the 3# middle leg 13 to the vicinity of the (n+3) pier; (4) The bridge crane crane 14 hoists the 3# middle leg 13 to the top of the (n+5) pier for installation and anchoring, and supports the main beam 11; (5) Retract the 2# front leg 12 and move it to the top of the (n+6) pier to support the main beam 11 and connect it with the 1# front leg 12 as a whole; (6) Remove the (n+5) pier side bracket.

[0140] Please also read Fig.24Step 20: (1) 1# overhead crane 14 hoists and suspends (n+6) pier 1# block under the main beam 11 of the bridge erection machine, positions and adjusts it, and leaves a position for the wet joint 16; (2) 2# and 3# overhead cranes 14 symmetrically hoist and splice (n+5) pier 1# block, positions and adjusts it, applies glue to the joint, and tensions the temporary prestressed steel bars of two adjacent sections; (3) Tension the permanent prestressed steel strands between (n+5) pier 1# blocks, and the overhead crane 14 unloads.

[0141] Please also read Fig.25 Step 21: (1) 1# overhead crane 14 sequentially hoists and suspends the remaining 2#~8# segments of (n+6) pier under the main beam 11 of the bridge erection machine, adjusts the positioning, applies glue to the joints, and tensions the temporary prestressed steel bars; (2) symmetrically hoist and splice the remaining 2#~8# segments of (n+5) pier in sequence, and tensions the temporary prestressed steel bars of the two adjacent segments; (3) tensions the permanent prestressed steel strands between the 2#~8# blocks of (n+5) pier in sequence, and the overhead crane 14 unloads.

[0142] Please also read Fig.26 , Step 22: (1) Close the formwork and pour concrete with three wet joints 16; (2) After the concrete strength reaches the required level, tension the permanent prestressed steel strands between the (n+4) and (n+5) piers and between the (n+5) and (n+6) piers; (3) Unload the bridge crane hanging system, and the construction of the two bridge sections is completed.

[0143] Step S150: releasing the temporary consolidation of the two pier top blocks on the transition pier 23.

[0144] Specifically, the temporary prestress of the pseudo cantilever construction of the transition pier 23 T structure is released, and the temporary consolidation mortar 32 between the two pier top blocks of the pier top is released, and the pseudo T structure system conversion of the transition pier 23 is completed. In the process of symmetrical cantilever splicing of the T structure, after the permanent prestressed steel strands between the middle pier 24 of the first span in the second joint and the transition pier 23 are tensioned, the temporary consolidation of the two pier top blocks on the transition pier 23 is released. It can be understood that in other embodiments, the temporary consolidation of the two pier top blocks on the transition pier 23 can also be released after the construction of the second joint of the bridge is completed.

[0145] Please also read Fig. 27 and Fig.28 , the specific method of removing the false T structure is:

[0146] 1) First, symmetrically release and extract the prestressed steel strands Ls1-8 between the 8# blocks, and then release and extract the prestressed steel bars Lms1-8. In this way, release and extract the temporary prestressed steel strands of the 7# blocks, 6# blocks, and 1# blocks in turn to release the temporary prestress of the T-structure false cantilever construction;

[0147] 2) Use a rope saw to cut the mortar 32 layers between the 0# blocks. After a ring seam is cut in the mortar 32 layers, since the end surface of the 0# pier top block is covered with a plastic film 31, the mortar 32 layers will automatically fall off, the temporary consolidation mortar 32 is released, and the false T-structure system is released.

[0148] Among them, the consolidation and release method of the pier top block on the above-mentioned transition pier 23 is applicable to the bridge structure in which the transition pier 23 is a pier-beam consolidation. If the piers and beams are in a simply supported state, temporary supports can be set between the piers and beams, and temporary consolidation can be performed with vertical prestress, which can also realize the symmetrical cantilever construction of the false T structure.

[0149] In one embodiment, the present invention is not limited to the four overhead cranes 14 used in this case, and two or three overhead cranes 14 may be used. If two overhead cranes 14 are used, the pier segment beams need to be hoisted in sequence during the construction of the double T structure or T structure + semi-suspension, but this does not affect the prestress and wet joints 16; if three overhead cranes 14 are used, a T structure and a semi-suspension can be hoisted at the same time, which may have a little impact on the double T structure and the double T structure + semi-suspension, but does not affect the prestress and wet joints 16. Therefore, the work efficiency is still very high.

[0150] See also Fig.29 The present invention also provides a bridge construction method based on the above-mentioned super-long section bridge erection machine 10. The construction method is a second method for constructing the super-long section bridge erection machine 10, which can realize the double-span full suspension erection construction of the bridge. Specifically, the construction method includes the following steps:

[0151] Step S210: Use the overhead crane 14 to synchronously suspend the segment beams of the first span and the second span under the main beam 11 of the bridge erection machine in sequence, adjust the positioning, apply glue to the joints, and tension the temporary prestressed steel bars.

[0152] Please also read Fig.30 Step 1: The super-long section bridge erecting machine 10 is in place. The two front legs 12 of the bridge erecting machine are respectively located on the (n+2) pier and the (n+3) pier, one middle leg 13 is located on the (n+1) pier, and the other two middle legs 13 are located on the (n+0) pier.

[0153] Please also read Fig.31 Step 2: (1) 1# overhead crane 14 hoists 3# middle leg 13 to the top of (n+2) pier to install, anchor and support main beam 11; (2) retract 2# front leg 12, move to the top of (n+3) pier to support main beam 11 and connect with 1# front leg 12 to form a whole; (3) remove the side bracket of (n+2) pier and move to (n+4) pier.

[0154] Please also read Fig.32, step 3: (1) the 1# overhead crane 14 hoists and suspends the second span 1# block below the main beam 11 of the bridge erecting machine; (2) the 2# overhead crane 14 hoists and suspends the first span 1# block below the main beam 11 of the bridge erecting machine.

[0155] Please also read Fig.33 , Step 4: (1) 1# overhead crane 14 sequentially hoists and suspends blocks 2# to 16# between piers (n+1) and (n+2) below the main beam 11 of the bridge erection machine, positions and adjusts them, leaves a wet joint 16 on the left side of block 1 and the right side of block 16#, applies glue to the remaining joints, and tensions the temporary prestressed steel bars of two adjacent sections; (2) 2# overhead crane 14 sequentially hoists and suspends blocks 2# to 16# between piers (n+0) and (n+1) below the main beam 11 of the bridge erection machine, positions and adjusts them, leaves a wet joint 16 on the left side of block 1 and the right side of block 16#, applies glue to the remaining joints, and tensions the temporary prestressed steel bars of two adjacent sections.

[0156] Step S220: Close the formwork at the joints and pour concrete, and tension the permanent prestressed steel strands of the first span and the second span.

[0157] Please also read Fig.34 Specifically, the method of this step is as follows: Step 5: (1) close the formwork with four wet joints 16 and pour concrete; (2) after the concrete strength reaches the requirement, tension the permanent prestressed steel strands of the first span and the second span.

[0158] Please also read Fig.35 , Step 6: Unload the bridge erection machine's hanging system to complete the full suspension construction of the first and second spans.

[0159] Step S230: the bridge erecting machine moves longitudinally over two spans, and the above steps are repeated until the full suspension construction of the bridge is completed.

[0160] Please also read Fig.36 Specifically, step 7: release the longitudinal constraint of the main beam 11, start the longitudinal movement cylinders of the 1# and 3# middle legs 13, and push the main beam 11 to move longitudinally across the span.

[0161] Please also read Fig.37 , Step 8: (1) Release the connection between the 1# and 2# front legs 12, retract the 1# front leg 12 and move it to the (n+4) pier side bracket and support the main beam 11; (2) Retract the 2# front leg 12 and move it forward to the (n+3) pier side bracket and support the main beam 11.

[0162] Please also read Fig.38 , Step 9: The beam transport vehicle carries the 2# middle support leg 13 to the vicinity of the (n+1) pier.

[0163] Please also read Fig.39Step 10: (1) 1# overhead crane 14 hoists 2# middle leg 13 to the top of (n+3) pier to install, anchor and support main beam 11; (2) retract 2# front leg 12 and move to the top of (n+4) pier to support main beam 11 and connect with 1# front leg 12 to form a whole; (3) remove the side bracket of (n+3) pier and move to (n+5) pier.

[0164] Please also read Fig.40 , Step 11: Release the longitudinal constraint of the main beam 11, start the longitudinal movement cylinders of the 1# and 3# middle legs 13, and push the main beam 11 to move longitudinally across the span.

[0165] Please also read Fig.41 , step 12: (1) release the connection between the 1# and 2# front legs 12, retract the 1# front leg 12 and move it to the (n+5) pier side bracket and support the main beam 11; (2) retract the 2# front leg 12 and move it to the (n+4) pier side bracket and support the main beam 11; (3) the beam transport vehicle carries the 1# middle leg 13 to the vicinity of the (n+1) pier; (4) the 1# overhead crane 14 hoists the 1# middle leg 13 to the top of the (n+4) pier to install, anchor and support the main beam 11; (5) retract the 2# front leg 12 and move it to the top of the (n+5) pier to support the main beam 11 and connect it with the 1# front leg 12 as a whole; (6) remove the (n+4) pier side bracket, and the bridge erection machine crosses the span.

[0166] Please also read Fig.42 Step 13: Complete the full suspension construction of the third and fourth spans according to the method of steps 3 to 6. Repeat the above steps until the full suspension construction of the bridge is completed.

[0167] Among them, this full suspension construction is not limited to the under-bridge beam feeding method in this case. If the bridge span is long enough and the segmental beam has the conditions for a 90-degree horizontal rotation on the bridge, the tail beam feeding on the bridge is also applicable.

[0168] The present invention is not limited to the three-span or four-span structures described in the above cases, nor is it limited to the 16 segments per span described in the above cases. In the construction of bridges with different combinations of span numbers and different numbers of segments, the above-mentioned different processes can be superimposed and combined to achieve the same completion, and this method is equally applicable.

[0169] The installation of the 0# block on the pier top can be done in advance by using other cranes, or by relying on the bridge erecting machine itself.

[0170] The above-mentioned super-long section-assembly bridge-building machine 10 and the bridge construction method based on the super-long section-assembly bridge-building machine can be constructed according to different working conditions by using different methods of simultaneous implementation of different processes, including: synchronous construction of double T-structures and side span semi-suspension, synchronous construction of double T-structures, synchronous construction of T-structures and side span semi-suspension, synchronous construction of transition pier 23 side span last span and side span first span (false T-structure symmetrical suspension), synchronous construction of double span full suspension, etc.; multiple processes can be combined for construction simultaneously, which can greatly improve construction efficiency, save construction time and cost, and have universal applicability. At the same time, the function of semi-suspension at the front end of the section-assembly bridge-building machine main beam 11 is realized, and the bridge-building machine can perform semi-suspension construction of the last span of each joint without crossing the span. The super-long section-assembly bridge-building machine 10 also has the function of crossing 2 spans continuously at one time, which greatly improves construction efficiency and saves construction time and cost.

[0171] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. An ultra-long section bridge erecting machine, characterized in that: include: A main beam, wherein the main beam has the same strength along the length direction so that the front end of the main beam can be semi-suspended; Two sets of front legs are installed at the front end of the main beam, and the two sets of front legs have a first state in which they are respectively positioned on two piers, and a second state in which the two sets of front legs are connected to stand on the same pier as a whole; Three sets of middle legs are installed on the main beam, and the three sets of middle legs are used to stand on the piers to support the main beam; A rear support leg, mounted on the rear end of the main beam; at least two overhead cranes, mounted on the top of the main beam and capable of moving along the main beam; and A hanging assembly is installed on the main beam, and the hanging assembly is used to hang the segmental beam.

2. The super-long section bridge erection machine according to claim 1 is characterized in that: The length of the main beam covers at least three spans of the bridge.

3. A bridge construction method based on the super-long section bridge according to any one of claims 1-2, wherein the bridge comprises a plurality of piers, the plurality of piers comprising two side piers at the head and tail, a transition pier supporting two adjacent bridges, and an intermediate pier between the transition pier and the side piers, the two side piers being the head side pier and the tail side pier, respectively, characterized in that: The construction method comprises the following steps: Temporarily consolidate the two pier top blocks on the transition pier into a whole; Symmetrically assembling the segmental beams on both sides of the middle pier of the first span and the second span in sequence, and synchronously assembling the segmental beams of the first side pier in sequence; The bridge erection machine moves longitudinally over two spans, and sequentially and symmetrically assembles the segmental beams on both sides of two adjacent piers, and repeats this step until the middle pier and the tail pier of the remaining span remain; The segmental beams on both sides of the middle pier of the last span are assembled symmetrically in sequence, and the segmental beams of the tail pier are assembled synchronously in sequence; Release the temporary consolidation of the two pier top blocks on the transition pier.

4. The bridge construction method based on the super-long section bridge erection machine according to claim 3 is characterized in that: The specific steps of temporarily consolidating the two pier top blocks on the transition pier into a whole are: The bridge erection machine erects two pier top blocks of the transition pier, ties up the steel bars in the internal cavities of the two pier top blocks, closes the formwork and casts concrete in the cavity, tensions the vertical prestress, and forms a pier-beam consolidation system; The end surface between the two pier top blocks of the transition pier is covered with a plastic film and closely attached to the end surface, and then the gap is closed with a template and poured with cement mortar to eliminate the gap between the two pier top blocks; The segmental beams are installed in a symmetrical manner on the left and right, and the temporary prestressed steel strands between the two segmental beams are tensioned symmetrically in turn to temporarily lock the two transition piers together.

5. The bridge construction method based on the super-long section bridge erection machine according to claim 3 is characterized in that: The specific steps of symmetrically assembling the segmental beams on both sides of the middle pier of the first span and the second span in sequence, and synchronously assembling the segmental beams of the first side pier in sequence are: The segment beams on both sides of the middle pier of the first span and the second span are synchronously and symmetrically hoisted and spliced ​​by an overhead crane, positioning and adjusting, gluing the joints, tensioning temporary prestressed steel bars of two adjacent segments, and then tensioning the permanent prestressed steel strands between the segment beams in turn, and the overhead crane is unloaded; The segment beams of the first pier are synchronously suspended under the main beam of the bridge erection machine by using an overhead crane, positioning and adjusting, gluing the joints, and tensioning temporary prestressed steel bars; The formwork is closed at the wet joint and concrete is poured. After the concrete strength reaches the required level, permanent prestressed steel strands are tensioned between the middle pier and the first side pier and between the two middle piers.

6. The bridge construction method based on the super-long section bridge erection machine according to claim 3 is characterized in that: The specific steps of symmetrically assembling the segmental beams on both sides of two adjacent piers are as follows: The segment beams on both sides of two adjacent piers are synchronously and symmetrically hoisted and spliced ​​by overhead cranes, positioning and adjusting, gluing the joints, and tensioning the temporary prestressed steel bars of the two adjacent segments; Then the permanent prestressed steel strands between the segment beams are tensioned in sequence, and the overhead crane is unloaded; The formwork is closed at the wet joint and concrete is poured. After the concrete strength reaches the required level, permanent prestressed steel strands are tensioned between the first pier and the previous pier and between two adjacent piers.

7. The bridge construction method based on the super-long section bridge erection machine according to claim 3 is characterized in that: The specific steps of symmetrically assembling the segmental beams on both sides of the middle pier of the last span in sequence and synchronously assembling the segmental beams of the tail pier in sequence are: The segment beams of the tail pier are sequentially suspended under the main beam of the bridge erection machine by using an overhead crane, positioning and adjusting, gluing the joints, and tensioning temporary prestressed steel bars; Two overhead cranes are used to synchronously and symmetrically lift and splice the segment beams on both sides of the middle pier of the last span, position and adjust, glue the joints, tension the temporary prestressed steel bars of the two adjacent segments, and then tension the permanent prestressed steel strands between the segment beams in turn, and the overhead crane is unloaded; The formwork is closed at the wet joint and concrete is poured. After the concrete strength reaches the required level, the permanent prestressed steel strands are tensioned between the middle pier of the last span and the previous pier and between the middle pier of the last span and the tail pier.

8. The bridge construction method based on the super-long section bridge erection machine according to claim 3 is characterized in that: The steps of releasing the temporary consolidation of the two pier top blocks on the transition pier are specifically as follows: The prestressed steel tendons between the segment beams are sequentially stretched and extracted symmetrically on the left and right sides, and then the prestressed steel bars are stretched and extracted; A rope saw is used to cut the mortar layer between the two pier top blocks on the transition pier. After a circumferential seam is cut in the mortar layer, the mortar layer will automatically fall off because the end surface of the pier top block is covered with a plastic film, and the temporary consolidation system is released.

9. A bridge construction method based on the super-long section bridge according to any one of claims 1-2, characterized in that: The following steps are involved: The overhead crane is used to synchronously hang the segment beams of the first span and the second span under the main beam of the bridge erection machine, position and adjust, glue the joints, and tension the temporary prestressed steel bars; Close the formwork at the joints and pour concrete, and tension the permanent prestressed steel strands of the first and second spans; The bridge-erecting machine moves longitudinally across two spans and repeats the above steps until the full suspension construction of the bridge is completed.

10. The bridge construction method based on the super-long section bridge erection machine according to claim 3 or 9, characterized in that: The steps of longitudinally moving the bridge erecting machine across two spans are specifically as follows: Release the longitudinal restraint of the main beam, start the longitudinal movement cylinder of the middle outrigger, and push the main beam to move longitudinally across the span; The connection between the two front legs is released, the first front leg is moved forward to the bracket on the side of the next pier and supports the main beam, and the second front leg is moved forward to the bracket on the side of the pier and supports the main beam; The overhead crane hoists a middle outrigger to the top of the pier where the second front outrigger is located, installs anchors and supports the main beam; The second front outrigger moves to the top of the next pier and connects with the first front outrigger as a whole; Release the longitudinal restraint of the main beam, start the longitudinal movement cylinder of the middle outrigger, and push the main beam to move longitudinally across the span; The connection between the two front legs is released, the first front leg is moved forward to the bracket on the side of the next pier and supports the main beam, and the second front leg is moved forward to the bracket on the side of the pier and supports the main beam; The overhead crane hoists a middle outrigger to the top of the pier where the second front outrigger is located, installs anchors and supports the main beam; The second front outrigger moves to the top of the next pier and connects with the first front outrigger as a whole, and the longitudinal movement of the bridge-erecting machine is completed by two spans.

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