Sectional beam synchronous and rapid erection construction method

Abstract

The invention discloses a construction method for synchronously and quickly erecting segmental beams, which comprises the following steps of: sequentially and symmetrically assembling the segmental beams on the two sides of a first-span middle pier, and sequentially and synchronously assembling the segmental beams of a first-side pier; segmental beams on the two sides of the remaining middle piers of the first joint are sequentially and symmetrically assembled; the two pier top blocks on the transition pier are temporarily and fixedly connected into a whole, and then the segmental beams on the two sides of the transition pier are sequentially and symmetrically assembled; segmental beams on the two sides of the remaining middle pier of the second connection are sequentially and symmetrically assembled, and when the segmental beams on the two sides of the middle pier of the last span are assembled, the segmental beams of the tail side pier are sequentially and synchronously assembled; and the temporary consolidation between the two pier top blocks on the transition pier is relieved. According to the construction method, all the middle piers and the transition piers can adopt T-structure symmetrical suspension splicing construction, semi-suspension construction of the first-connection first-span and the last-connection last-span can be synchronously carried out with adjacent T-structure symmetrical suspension splicing construction, the construction efficiency can be greatly improved, the construction period and cost can be saved, and the construction method has universal applicability.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a method for synchronously and rapidly erecting a segmental beam. 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 one-unit bridge as an example, that is, first the first T-structure symmetrical suspension is carried out, 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 symmetrical suspension is carried out, the second span is closed and the bridge-erecting machine passes over the span, and finally the remaining half suspension of this unit is constructed, the third span is closed and the bridge-erecting machine passes over the span to construct the next unit, and so on. All processes need to be completed separately, and cannot be parallelized or crossed, resulting in low efficiency and long construction period. Summary of the invention

[0004] Based on this, it is necessary to provide a method for synchronous and rapid erection of segmental beams to address the problems of low efficiency and long construction period in the existing segmental beam erection construction method.

[0005] A method for synchronously and rapidly erecting a segmental beam, wherein the bridge comprises a plurality of piers, the plurality of piers comprising two side piers at the head and tail, a transition pier for supporting two adjacent bridges, and an intermediate pier between the transition pier and the side piers, wherein the two side piers are respectively a head side pier and a tail side pier, and the construction method comprises the following steps:

[0006] Symmetrically assembling the segmental beams on both sides of the middle pier of the first span in sequence, and synchronously assembling the segmental beams of the first side pier in sequence;

[0007] Symmetrically assembling the remaining segmental beams on both sides of the middle pier of the first joint in sequence;

[0008] Temporarily consolidating the two pier top blocks on the transition pier into a whole, and then symmetrically assembling the segment beams on both sides of the transition pier in sequence;

[0009] The segmental beams on both sides of the remaining middle piers of the second joint are assembled symmetrically in sequence, and when the segmental beams on both sides of the middle piers of the last span are assembled, the segmental beams of the tail piers are assembled in sequence and synchronously;

[0010] The temporary consolidation between the two pier top blocks on the transition pier is released.

[0011] In one embodiment, before the step of sequentially and symmetrically assembling the segment beams on both sides of the middle pier of the first span, the step further includes:

[0012] After the bridge erection machine is in place, the pier top block is installed on the intermediate pier.

[0013] In one embodiment, the specific steps of symmetrically assembling the segmental beams on both sides of the middle pier of the first span in sequence and synchronously assembling the segmental beams of the first pier in sequence are:

[0014] Two overhead cranes are used to symmetrically lift and splice the segment beams on both sides of the middle pier in sequence, glue the joints, tension the temporary prestressed steel bars between two adjacent segment beams, and then tension the permanent prestressed steel strands between the segment beams in sequence, and the overhead cranes are unloaded;

[0015] The overhead crane synchronously suspends the segment beam of the first side pier under the main beam of the bridge erection machine in sequence, adjusts the position, applies glue to the joints, and tensions the temporary prestressed steel bars;

[0016] 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 and the first side pier.

[0017] In one embodiment, the steps of sequentially and symmetrically assembling the remaining segment beams on both sides of the middle pier of the first joint are specifically:

[0018] Two overhead cranes are used to symmetrically lift and splice the segment beams on both sides of the middle pier in sequence, glue the joints, and tension the temporary prestressed steel bars between two adjacent segment beams;

[0019] The permanent prestressed steel strands between the intermediate pier segment beams are tensioned sequentially, and the overhead crane is unloaded;

[0020] Close the formwork at the wet joint and pour the concrete;

[0021] After the concrete strength is reached, the permanent prestressed steel strands are tensioned between the two intermediate piers;

[0022] Repeat the above steps until all the segmental beams of the intermediate piers of the first joint are assembled.

[0023] In one embodiment, the steps of temporarily consolidating the two pier top blocks on the transition pier into a whole and then sequentially and symmetrically assembling the segment beams on both sides of the transition pier are specifically as follows:

[0024] Filling mortar between the two pier top blocks of the transition pier for temporary consolidation;

[0025] Two overhead cranes are used to symmetrically hoist the segment beams on both sides of the transition pier in sequence, glue is applied to the joints, and temporary prestressed steel bars between two adjacent segment beams are tensioned;

[0026] Then, temporary prestressed steel strands between the segment beams of the transition pier are tensioned in sequence, and the overhead crane is unloaded;

[0027] 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 between the intermediate pier and the transition pier are tensioned.

[0028] In one embodiment, the step of filling mortar between the two pier top blocks of the transition pier for temporary consolidation treatment is specifically as follows:

[0029] 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;

[0030] 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;

[0031] 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.

[0032] In one embodiment, the step of releasing the temporary consolidation of the two pier top blocks on the transition pier is specifically:

[0033] The temporary prestressed steel tendons between the segment beams are sequentially stretched and extracted symmetrically, and then the temporary prestressed steel bars are stretched and extracted;

[0034] 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.

[0035] In one embodiment, the steps of symmetrically assembling the segmental beams on both sides of the remaining middle piers of the second joint in sequence, and assembling the segmental beams of the tail pier in sequence and synchronously when assembling the segmental beams of the last span of the middle pier are specifically as follows:

[0036] The overhead crane sequentially hoists the segment beams of the tail pier and suspends them under the main beam of the bridge erection machine, positions and adjusts them, applies glue to the joints, and tensions the temporary prestressed steel bars of the two adjacent segments;

[0037] Two overhead cranes are used to synchronously and symmetrically assemble the segment beams on both sides of the middle pier of the last span, glue is applied to the joints, and the temporary prestressed steel bars between the two adjacent segment beams are tensioned, and then the permanent prestressed steel strands between the segment beams are tensioned in turn, and the overhead cranes are unloaded;

[0038] 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 and the tail pier.

[0039] In one of the embodiments, after the permanent prestressed steel strands between the intermediate pier and the transition pier of the first span in the second section are tensioned, the temporary consolidation of the two pier top blocks on the transition pier is released.

[0040] In one embodiment, the steps of the bridge erecting machine crossing the span during the construction process are specifically as follows:

[0041] The front outriggers are retracted, the longitudinal constraints of the main beam are released, and the longitudinal movement cylinder is started to push the main beam to move longitudinally across the span;

[0042] After the main beam is moved longitudinally into position, the front legs are extended and supported on the brackets of the piers;

[0043] The overhead crane installs the pier top block of the pier column;

[0044] During the crane reverse operation, the outriggers are installed and anchored to the pier top block of the pier column to support the main beam;

[0045] The bracket on the side of the pier is removed, and the bracket is moved to the next pier.

[0046] In the above-mentioned segmental beam synchronous rapid erection construction method, except for the first span of the first joint and the last span of the last joint, which are semi-suspended, all other intermediate piers and transition piers can be constructed by symmetrical cantilever splicing of T structures (or pseudo-T structures). The semi-suspended construction of the first span of the first joint and the last span of the last joint can also be carried out simultaneously with the symmetrical cantilever splicing of the adjacent T structures, which can greatly improve the construction efficiency, save construction time and cost, and has universal applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] 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.

[0048] Figure 1 A flowchart of a method for synchronously and rapidly erecting a segmental beam in one embodiment;

[0049] Figure 2 The schematic diagram of the structure of the bridge erecting machine is shown in FIG.

[0050] Figure 3 Schematic diagram of a bridge with three spans and a bridge with two spans;

[0051] Figure 4 for Figure 2 The schematic diagram of the starting position of the bridge erecting machine on the bridge pier is shown;

[0052] Figure 5 This is a schematic diagram of the middle leg being transported to the (n+1) pier;

[0053] Figure 6 This is a schematic diagram of the bridge erecting machine moving longitudinally across the span;

[0054] Figure 7 A schematic diagram of synchronously assembling the (n+1) pier 1# block and the (n+0) pier 1# block;

[0055] Figure 8 A schematic diagram of synchronously assembling blocks 2# to 8# of the (n+1) pier and blocks 2# to 7# of the (n+0) pier;

[0056] Fig. 9 This is a schematic diagram of the 3# overhead crane hoisting the 8# block of the (n+0) pier under the main beam of the bridge erecting machine;

[0057] Fig.10 Schematic diagram of closing the formwork and pouring concrete for the wet joint;

[0058] Fig.11 Schematic diagram of the bridge erecting machine unloading after the suspension system is released;

[0059] Fig.12 The schematic diagram of the bridge erection machine moving longitudinally across the span to the (n+3) pier;

[0060] Fig.13 This is a schematic diagram of symmetrically hoisting and splicing (n+2) piers 1# to 8#;

[0061] Fig.14 Schematic diagram of closing the formwork and pouring concrete for the wet joint;

[0062] Fig.15 Schematic diagram of temporary consolidation of the top block of pier (n+3) and longitudinal movement of the bridge-erecting machine to pier (n+4);

[0063] Fig.16 This is a schematic diagram of the symmetrical lifting and splicing of the (n+3) pier 1# block;

[0064] Fig.17 This is a schematic diagram of symmetrically hoisting and splicing blocks 2# to 8# of pier (n+3) in sequence;

[0065] Fig.18 Schematic diagram of closing the formwork and pouring concrete for the wet joint;

[0066] Fig.19 The schematic diagram of the bridge erecting machine moving longitudinally across the span to the (n+5) pier;

[0067] Fig. 20 It is a schematic diagram of hoisting and hanging (n+5) pier 1# block and symmetrically hoisting and splicing (n+4) pier 1# block;

[0068] Fig.21 It is a schematic diagram of hoisting and hanging (n+5) pier 2#~7# blocks and symmetrically hoisting and splicing (n+4) pier 2#~8# segments;

[0069] Fig. 22Schematic diagram of hoisting and hanging (n+5) pier 8# block and pouring concrete by closing the wet joint formwork;

[0070] Fig.23 This is a schematic diagram of the unloading of the bridge crane hanging system;

[0071] Fig.24 This is a schematic diagram of temporary consolidation of the top block of the transition pier;

[0072] Fig.25 It is a schematic diagram of tensioning temporary prestressed steel bars and temporary prestressed steel tendons between segments;

[0073] Fig.26 Distribution diagram of temporary prestressed steel bars and temporary prestressed steel tendons on the segmental beam section.

[0074] Reference numerals:

[0075] 11-main beam, 12-front outrigger, 13-middle outrigger, 14-rear outrigger, 15-overhead crane, 21-forward pier, 22-rear pier, 23-transition pier, 24-middle pier, 30-wet joint, 41-plastic film, 42-mortar. DETAILED DESCRIPTION

[0076] 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.

[0077] 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.

[0078] 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.

[0079] See also Figure 1 , a construction method for synchronously and rapidly erecting segmental beams in one embodiment, the construction method is implemented by using a segmental assembly bridge erection machine. Please also refer to Figure 2 The segmental assembly bridge-erecting machine includes a main beam 11, front legs 12, two sets of middle legs 13, rear legs 14, three sets of cranes 15 and a hanging system. Different from ordinary segmental assembly bridge-erecting machines, this bridge-erecting machine has three cranes 15, the main beam 11 is designed with equal strength, and the rear legs 14 and the middle legs 13 are of equal strength; functionally, the semi-suspension construction of the front end of the main beam 11 can be realized.

[0080] Please also read Figure 3 The bridge comprises a plurality of piers, the plurality of 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, the two side piers being the head side pier 21 and the tail side pier 22. Specifically, the construction method comprises the following steps:

[0081] Step S110: symmetrically assembling the segmental beams on both sides of the first span middle pier 24 in sequence, and synchronously assembling the segmental beams of the first side pier 21 in sequence.

[0082] Specifically, in the present invention, the side span semi-suspension and the T-structure symmetrical suspension assembly are constructed synchronously. The T-structure symmetrical suspension assembly is specifically as follows: two overhead cranes 15 are used to symmetrically lift and assemble the segmental beams on both sides of the middle pier 24 in sequence, glue the joints, and tension the temporary prestressed steel bars between the two adjacent segmental beams. Then, the permanent prestressed steel strands between the segmental beams are tensioned in sequence, and the overhead crane 15 is unloaded. The side span semi-suspension is specifically as follows: the third overhead crane 15 synchronously and sequentially suspends the segmental beam of the first side pier 21 below the main beam 11 of the bridge erection machine, positions and adjusts, glues the joints, and tensions the temporary prestressed steel bars.

[0083] Finally, the wet joint 30 is closed and concrete is poured. After the concrete strength reaches the required level, the permanent prestressed steel strands are tensioned between the middle pier 24 and the first side pier 21. In one embodiment, before the step of performing the synchronous construction of the side span semi-suspension and the T-structure symmetrical suspension assembly, the step further includes: after the bridge erection machine is in place, the pier top block is installed on the middle pier 24.

[0084] Specifically, in this embodiment, taking the first section as a 3-span bridge (4 piers: (n+0), (n+1), (n+2), (n+3)) and the second section as a 2-span bridge (3 piers: (n+3), (n+4), (n+5, (n+3) is the transition pier 23) as an example, a specific description is given to facilitate understanding of the technical solution of the present invention.

[0085] The specific steps for the simultaneous construction of the side span semi-suspension and the T-structure symmetrical suspension are as follows:

[0086] Please also read Figure 4 , Step 1: The bridge erecting machine is in place. The front leg 12 of the bridge erecting machine is located on the (n+1) pier, the first middle leg 13 of the bridge erecting machine is located on the (n+0) pier, and the second middle leg 13 and the rear leg 14 of the bridge erecting machine are located on the (n-1) pier.

[0087] Please also read Figure 5 Step 2: (1) 1# overhead crane 15 installs the 0# block on the top of the (n+1) pier; (2) 1# overhead crane 15 transports the 2# middle support leg 13 to the 0# block on the top of the (n+1) pier for installation and anchoring to support the main beam 11.

[0088] Please also read Figure 6 Step 3: (1) The front outrigger 12 is retracted, the longitudinal constraint of the main beam 11 is released, the longitudinal movement cylinder is started, and the main beam 11 is pushed to move longitudinally across the span; (2) After the main beam 11 is longitudinally moved into place, the front outrigger 12 is extended to support the (n+2) pier bracket; (3) The 1# overhead crane 15 installs the 0# block on the top of the (n+2) pier; (4) The 1# overhead crane 15 reverses the 1# middle outrigger 13 to the top of the (n+2) pier for installation and anchoring, thereby supporting the main beam 11; (5) The side bracket of the (n+1) pier is removed and moved to the (n+3) pier.

[0089] Please also read Figure 7 Step 4: (1) 1# and 2# cranes 15 symmetrically hoist and splice (n+1) pier 1# blocks, apply glue to the joints, and tension the temporary prestressed steel bars of the two adjacent sections; (2) Tension the permanent prestressed steel strands between the two 1# blocks of (n+1) pier, and the crane 15 unloads; (3) 3# crane 15 hoists and hangs (n+0) pier 1# block under the main beam 11 of the bridge erection machine, and adjusts the position to leave a position for the wet joint 30.

[0090] Please also read Figure 8 Step 5: (1) The 1# and 2# cranes 15 of the bridge erecting machine symmetrically hoist and splice the (n+1) pier 2#~8# blocks in turn, apply glue to the joints, and tension the temporary prestressed steel bars of the two adjacent segments; (2) The 3# crane 15 synchronously and sequentially suspends the (n+0) pier 2#~7# block segment beams under the main beam 11 of the bridge erecting machine, adjusts the positioning, applies glue to the joints, and tensions the temporary prestressed steel bars; (3) The permanent prestressed steel strands between the (n+1) pier 2#~8# blocks are tensioned in turn, and the crane 15 unloads.

[0091] Please also read Fig. 9 , Step 6: 3# overhead crane 15 hoists (n+0) pier 8# block under the main beam 11 of the bridge erection machine, adjusts the position, applies glue to the joint with 7# block on the left side, and tensions the temporary prestressed steel bars.

[0092] Please also read Fig.10 , Step 7: (1) Close the formwork and pour concrete at the wet joint 30; (2) After the concrete strength reaches the required level, tension the permanent prestressed steel strands between the (n+0) and (n+1) piers.

[0093] Please also read Fig.11 , Step 8: Release the hanging system, unload the bridge crane, and prepare to cross the span.

[0094] Step S120: symmetrically assembling the segmental beams on both sides of the remaining intermediate piers 24 of the first set in sequence.

[0095] Specifically, this step is the symmetrical cantilever construction of the T-structure. Two overhead cranes 15 are used to symmetrically lift and splice the segmental beams on both sides of the middle pier 24 in turn, glue the joints, and tension the temporary prestressed steel bars between the two adjacent segmental beams. The permanent prestressed steel strands between the segmental beams of the middle pier 24 are tensioned in turn, and the overhead crane 15 is unloaded. The formwork of the wet joint 30 is closed and concrete is poured. After the concrete strength is reached, the permanent prestressed steel strands between the two middle piers 24 are tensioned. Repeat the above steps until the segmental beams of the middle piers 24 of the first joint are fully assembled.

[0096] Specifically, the steps of T-structure symmetrical cantilever construction are as follows:

[0097] Please also read Fig.12 , Step Nine: (1) The front outrigger 12 is retracted, the longitudinal constraint of the main beam 11 is released, the longitudinal movement cylinder is started, and the main beam 11 is pushed to move longitudinally across the span; (2) After the main beam 11 is longitudinally moved into place, the front outrigger 12 is extended to support the side bracket of the (n+3) pier; (3) The 1# overhead crane 15 installs the 0# block on the top of the (n+3) pier; (4) The 1# overhead crane 15 reverses the 2# middle outrigger 13 to the 0# block on the top of the (n+3) pier to install, anchor, and support the main beam 11; (5) The side bracket of the (n+2) pier is removed and moved to the (n+4) pier.

[0098] Please also read Fig.13 Step 10: (1) 1# and 2# overhead cranes 15 symmetrically hoist and splice (n+2) piers 1# to 8# in turn, apply glue to the joints, and tension the temporary prestressed steel bars of the two adjacent sections; (2) Tension the permanent prestressed steel strands between (n+2) piers 1# to 8# in turn, and the overhead crane 15 unloads.

[0099] Please also read Fig.14 , Step 11: (1) Close the formwork at the wet joint 30 and pour concrete; (2) After the concrete strength is reached, tension the permanent prestressed steel strands between the (n+1) and (n+2) piers.

[0100] Step S130: temporarily consolidating the two pier top blocks on the transition pier 23 into a whole, and then symmetrically assembling the segment beams on both sides of the transition pier 23 in sequence.

[0101] Specifically, since the top 0# blocks of the transition pier 23 are separated, the conditions for symmetrical cantilever splicing of the T structure are not met. Therefore, in the present invention, mortar 42 is filled between the two top blocks of the transition pier 23 for temporary consolidation to create the conditions for symmetrical cantilever splicing of the T structure.

[0102] Then the transition pier 23 is constructed by symmetrically hanging the false T structure, and two overhead cranes 15 are used to symmetrically hoist the segment beams on both sides of the transition pier 23 in turn, glue is applied to the joints, and the temporary prestressed steel bars between the two adjacent segment beams are tensioned. Then the temporary prestressed steel strands between the segment beams of the transition pier 23 are tensioned in turn, and the overhead crane 15 is unloaded. The formwork of the wet joint 30 is closed and concrete is poured. After the concrete strength reaches the requirement, the permanent prestressed steel strands between the intermediate pier 24 and the transition pier 23 are tensioned.

[0103] Specifically, the steps for the symmetrical cantilever construction of the false T-structure of the transition pier 23 are as follows:

[0104] Please also read Fig.15 Step 12: (1) Fill mortar 42 between the top 0# blocks of (n+3) pier for temporary consolidation. (2) Retract the front legs 12, release the longitudinal constraints of the main beam 11, start the longitudinal movement cylinder, and push the main beam 11 to move longitudinally across the span. (3) After the main beam 11 moves longitudinally into place, the front legs 12 extend and support on the side brackets of (n+4) pier. (4) 1# overhead crane 15 installs the top 0# block of (n+4) pier. (5) 1# overhead crane 15 reverses the 1# middle leg 13 to the top 0# block of (n+4) pier to install, anchor, and support the main beam 11. (6) Remove the side brackets of (n+3) pier and move to (n+5) pier.

[0105] Please also read Fig.16 Step 13: (1) 1# and 2# overhead cranes 15 symmetrically hoist and splice (n+3) pier 1# blocks, apply glue to the joints, and tension the temporary prestressed steel bars of the two adjacent sections; (2) tension the temporary prestressed steel strands between the two 1# blocks of the (n+3) pier, and then the overhead crane 15 unloads.

[0106] Please also read Fig.17 Step 14: (1) 1# and 2# overhead cranes 15 symmetrically hoist and splice (n+3) pier 2#~8# blocks in turn, apply glue to the joints, and tension the temporary prestressed steel bars of adjacent segments; (2) Tension the temporary prestressed steel strands between (n+3) pier 2#~8# blocks in turn, and the overhead crane 15 unloads.

[0107] Please also read Fig.18 Step 15: (1) Close the formwork at the wet joint 30 and pour concrete; (2) After the concrete strength reaches the required level, tension the permanent prestressed steel strands between the (n+2) and (n+3) piers.

[0108] Step S140: symmetrically assembling the segmental beams on both sides of the remaining middle piers 24 of the second set in sequence, and when assembling the segmental beams of the last span of the middle pier 24, assembling the segmental beams of the tail pier 22 in sequence and synchronously.

[0109] Specifically, the semi-suspension of the side span and the symmetrical cantilever assembly of the T-structure are carried out synchronously (including the semi-suspension of the front end of the main beam 11): the overhead crane 15 sequentially hoists and suspends the segmental beams of the tail side pier 22 under the main beam 11 of the bridge erection machine, positions and adjusts, glues the joints, and tensions the temporary prestressed steel bars between the two adjacent segmental beams. Two overhead cranes 15 are used to synchronously and symmetrically suspend the segmental beams on both sides of the middle pier 24 of the last span, glues the joints, tensions the temporary prestressed steel bars of the two adjacent segments, and then tensions the permanent prestressed steel strands between the segmental beams in turn, and the overhead crane 15 is unloaded. The formwork of the wet joint 30 is closed and concrete is poured. After the concrete strength reaches the requirement, the permanent prestressed steel strands between the middle pier 24 and the tail side pier 22 are tensioned.

[0110] Specifically, the above steps are as follows:

[0111] Please also read Fig.19 Step 16: (1) The front outrigger 12 is retracted, the longitudinal constraint of the main beam 11 is released, the longitudinal movement cylinder is started, and the main beam 11 is pushed to move longitudinally across the span; (2) After the main beam 11 is longitudinally moved into place, the front outrigger 12 is extended to support the side bracket of the (n+5) pier; (3) The 1# overhead crane 15 installs the 0# block on the top of the (n+5) pier; (4) The 1# overhead crane 15 reverses the 2# middle outrigger 13 to the 0# block on the top of the (n+5) pier to install, anchor, and support the main beam 11; (5) The side bracket of the (n+5) pier is removed.

[0112] Please also read Fig. 20 Step 17: (1) 1# overhead crane 15 hoists and suspends the 1# block of pier (n+5) below the main beam 11 of the bridge erection machine, and adjusts the position to leave a position for the wet joint 30; (2) 2# and 3# overhead cranes 15 hoist and splice the 1# block of pier (n+4) symmetrically, apply glue to the joint, and tension the temporary prestressed steel bars of the two adjacent sections; (3) Tension the permanent prestressed steel strands between the two 1# blocks of pier (n+4), and then the overhead crane 15 unloads.

[0113] Please also read Fig.21 Step 18: (1) 1# overhead crane 15 sequentially hoists and suspends (n+5) pier 2#~7# blocks 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 of two adjacent sections; (2) 2# and 3# overhead cranes 15 sequentially and synchronously and symmetrically suspend (n+4) pier 2#~8# sections, apply glue to the joints, and tensions the temporary prestressed steel bars of two adjacent sections; (3) The permanent prestressed steel strands between (n+4) pier 2#~8# blocks are tensioned sequentially, and the overhead crane 15 is unloaded.

[0114] Please also read Fig. 22, Step 19: (1) 1# overhead crane 15 hoists and suspends (n+5) pier 8#, applies glue to the joint with 7# on the right side, and tensions temporary prestressed steel bars; (2) Close the formwork with three wet joints 30 and pour concrete; (3) After the concrete strength reaches the requirement, tension the permanent prestressed steel strands between (n+3) and (n+4) piers, and between (n+4) and (n+5) piers.

[0115] Please also read Fig.23 , Step 20: Unloading the bridge erecting machine suspension system.

[0116] Step S150: releasing the temporary consolidation between the two pier top blocks on the transition pier 23.

[0117] Specifically, the temporary prestress of the T-structure pseudo-cantilever construction of the transition pier 23 is released, and the temporary consolidation mortar 42 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 of 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 first span of the second joint of the bridge is completed.

[0118] Please also read Fig.24 In one embodiment, mortar 42 is filled between the two pier top blocks of the transition pier 23, and the steps of temporary consolidation are 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, casts the concrete in the cavity with the closed formwork, and tensions the vertical prestress to form a pier-beam consolidation system. Then, the end face between the two pier top blocks of the transition pier 23 is covered with a plastic film 41 and is close to the end face, and the gap is closed with the closed formwork and the mortar 42 is cast in place to eliminate the gap between the two pier top blocks; the segmental beams are installed in a left-right symmetrical manner, and the temporary prestressed steel strands between the two segmental beams are tensioned symmetrically in turn to temporarily lock the two transition piers together.

[0119] Please also read Fig.25 and Fig.26 , the specific method of removing the false T structure is:

[0120] 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;

[0121] 2) Use a rope saw to cut the mortar 42 layer between the 0# blocks. After a ring seam is cut in the mortar 42 layer, since the end surface of the 0# pier top block is covered with a plastic film 41, the mortar 42 layer will automatically fall off, the temporary consolidation mortar 42 is released, and the false T-structure system is released.

[0122] It should be noted that the present invention is not limited to the three-span or two-span bridges described in the above case. In the construction of bridges with different span combinations, the above-mentioned processes can be superimposed and combined to achieve the same goal. It is also not limited to the 16 segments per span described in the above case. The above method is also applicable to different span combinations and different numbers of segments. The present invention is not limited to the tail beam feeding method on the bridge in this case. If there are traffic conditions under the bridge, the present invention is also applicable.

[0123] The above-mentioned segmental beam synchronous rapid erection construction method, except for the first span of the first joint and the last span of the last joint, which have semi-suspension construction, all other intermediate piers 24 and transition piers 23 can all be constructed by T-structure (or pseudo-T-structure) symmetrical cantilever splicing. The semi-suspension construction of the first span of the first joint and the last span of the last joint can also be carried out simultaneously with the symmetrical cantilever splicing construction of the adjacent T-structures, which can greatly improve the construction efficiency, save construction time and cost, and has universal applicability. The front end of the main beam 11 of the segmented bridge-building machine is semi-suspended, and the bridge-building machine can carry out the semi-suspension construction of the last span of each joint without crossing the span, thereby improving the construction efficiency.

[0124] 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. A method for synchronously and rapidly erecting a segmental beam, characterized in that: The bridge comprises a plurality of piers, the plurality of piers comprising two side piers at the head and tail, a transition pier for supporting two adjacent bridges, and an intermediate pier between the transition pier and the side piers, the two side piers being a head side pier and a tail side pier, respectively. The construction method comprises the following steps: Symmetrically assembling the segmental beams on both sides of the middle pier of the first span in sequence, and synchronously assembling the segmental beams of the first side pier in sequence; Symmetrically assembling the remaining segmental beams on both sides of the middle pier of the first joint in sequence; Temporarily consolidating the two pier top blocks on the transition pier into a whole, and then symmetrically assembling the segment beams on both sides of the transition pier in sequence; The segmental beams on both sides of the remaining middle piers of the second joint are assembled symmetrically in sequence, and when the segmental beams on both sides of the middle piers of the last span are assembled, the segmental beams of the tail piers are assembled in sequence and synchronously; The temporary consolidation between the two pier top blocks on the transition pier is released.

2. The method for synchronously and rapidly erecting segmental beams according to claim 1, characterized in that: Before the step of sequentially and symmetrically assembling the segment beams on both sides of the middle pier of the first span, the step further includes: After the bridge erection machine is in place, the pier top block is installed on the intermediate pier.

3. The method for synchronously and rapidly erecting segmental beams according to claim 1, characterized in that: The specific steps of symmetrically assembling the segmental beams on both sides of the middle pier of the first span in sequence and synchronously assembling the segmental beams of the first side pier in sequence are: Two overhead cranes are used to symmetrically lift and splice the segment beams on both sides of the middle pier in sequence, glue the joints, tension the temporary prestressed steel bars between two adjacent segment beams, and then tension the permanent prestressed steel strands between the segment beams in sequence, and the overhead cranes are unloaded; The overhead crane synchronously suspends the segment beam of the first side pier under the main beam of the bridge erection machine in sequence, adjusts the position, applies glue to the joints, and tensions the temporary prestressed steel bars; 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 and the first side pier.

4. The method for synchronously and rapidly erecting segmental beams according to claim 1, characterized in that: The steps of symmetrically assembling the remaining segmental beams on both sides of the middle pier of the first joint are specifically as follows: Two overhead cranes are used to symmetrically lift and splice the segment beams on both sides of the middle pier in sequence, glue the joints, and tension the temporary prestressed steel bars between two adjacent segment beams; The permanent prestressed steel strands between the intermediate pier segment beams are tensioned sequentially, and the overhead crane is unloaded; Close the formwork at the wet joint and pour the concrete; After the concrete strength is reached, the permanent prestressed steel strands are tensioned between the two intermediate piers; Repeat the above steps until all the segmental beams of the intermediate piers of the first joint are assembled.

5. The method for synchronously and rapidly erecting segmental beams according to claim 1, characterized in that: The steps of temporarily consolidating the two pier top blocks on the transition pier into a whole and then sequentially and symmetrically assembling the segment beams on both sides of the transition pier are specifically as follows: Filling mortar between the two pier top blocks of the transition pier for temporary consolidation; Two overhead cranes are used to symmetrically hoist the segment beams on both sides of the transition pier in sequence, glue is applied to the joints, and temporary prestressed steel bars between two adjacent segment beams are tensioned; Then, temporary prestressed steel strands between the segment beams of the transition pier 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, the permanent prestressed steel strands between the intermediate pier and the transition pier are tensioned.

6. The method for synchronously and rapidly erecting segmental beams according to claim 5, characterized in that: The step of filling mortar between the two pier top blocks of the transition pier to perform temporary consolidation treatment is specifically as follows: 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.

7. The method for synchronously and rapidly erecting segmental beams according to claim 6, characterized in that: The step of releasing the temporary consolidation of the two pier top blocks on the transition pier is specifically as follows: The temporary prestressed steel tendons between the segment beams are sequentially stretched and extracted symmetrically, and then the temporary 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.

8. The method for synchronously and rapidly erecting segmental beams according to claim 1, characterized in that: The specific steps of symmetrically assembling the segmental beams on both sides of the remaining middle piers of the second joint in sequence, and assembling the segmental beams of the tail pier in sequence and synchronously when assembling the segmental beams of the last span of the middle pier are as follows: The overhead crane sequentially hoists the segment beams of the tail pier and suspends them under the main beam of the bridge erection machine, positions and adjusts them, applies glue to the joints, and tensions the temporary prestressed steel bars of the two adjacent segments; Two overhead cranes are used to synchronously and symmetrically assemble the segment beams on both sides of the middle pier of the last span, glue is applied to the joints, and the temporary prestressed steel bars between the two adjacent segment beams are tensioned, and then the permanent prestressed steel strands between the segment beams are tensioned in turn, and the overhead cranes are 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 and the tail pier.

9. The method for synchronously and rapidly erecting segmental beams according to claim 1, characterized in that: After the permanent prestressed steel strands between the intermediate pier and the transition pier of the first span in the second joint are tensioned, the temporary consolidation of the two pier top blocks on the transition pier is released.

10. The method for synchronously and rapidly erecting segmental beams according to claim 1, characterized in that: The specific steps of the bridge erection machine crossing the span during the construction process are: The front outriggers are retracted, the longitudinal constraints of the main beam are released, and the longitudinal movement cylinder is started to push the main beam to move longitudinally across the span; After the main beam is moved longitudinally into position, the front legs are extended and supported on the brackets of the piers; The overhead crane installs the pier top block of the pier column; During the crane reverse operation, the outriggers are installed and anchored to the pier top block of the pier column to support the main beam; The bracket on the side of the pier is removed, and the bracket is moved to the next pier.

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