A prestressed concrete continuous beam bridge assembled span by span without wet joints and its construction method

Abstract

The present invention discloses a non-wet joint segment-by-segment assembled prestressed concrete continuous beam bridge and a construction method thereof. The continuous beam bridge includes main girders and bridge piers for supporting the main girders. The main girders are multi-span prestressed concrete continuous girders, and the main girders are connected to the bridge piers through bearings. The main girders are longitudinally divided into a plurality of precast main girder segments, and adjacent precast main girder segments are connected through assembly joints. The construction method includes the following steps: constructing the first precast segment at the pier top, assembling the other precast main girder segments of the first span of the main girders and the segments from the second span to the relay splicing joint, grouting the corresponding bearings and tensioning the prestress, carrying out the second assembly, grouting the bearings again and tensioning the prestress, repeating the construction, constructing to the last precast segment at the beam end, and grouting the bearings to form the bridge. In the present invention, the precast main girder segments are all precast in the factory and integrally assembled on site, ensuring the construction quality and construction efficiency. The present invention has no wet joints and cast-in-place closure segments, improving the degree of standardization, factoryization, mechanization and informatization of the operation.

Description

Technical Field

[0001] The invention belongs to the field of bridge structure construction, and particularly relates to a prestressed concrete continuous beam bridge with no wet joints and erected span by span and a construction method thereof. Background Art

[0002] The segment precast and glued beam uses the prestress of prestressed steel strands to assemble precast segments into a whole, and the entire contact surface between segments is smeared with epoxy resin glue for sealing. This process was born in France in the 1960s and has been widely used in bridge projects worldwide, including in the fields of highways, municipal engineering, railways, rail transit, etc. in China.

[0003] Currently, wet joints or cast-in-place closure segments are provided in precast glued continuous beams to adjust construction errors, but at the same time, it reduces the degree of standardization, industrialization, and mechanization of operations, which is not conducive to improving construction efficiency and quality. Summary of the Invention

[0004] The invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a prestressed concrete continuous beam bridge with no wet joints and erected span by span and a construction method thereof.

[0005] The technical solution of the invention is: a prestressed concrete continuous beam bridge with no wet joints and erected span by span, including a main beam and bridge piers that support the main beam. The main beam is a multi-span prestressed concrete continuous beam, the main beam is connected to the bridge piers through bearings, the main beam is divided into several main beam precast segments along the longitudinal bridge direction, and adjacent main beam precast segments are connected through assembly joints.

[0006] Furthermore, the assembly joints include general assembly joints and relay assembly joints.

[0007] Furthermore, the relay assembly joints are arranged near the moment zero points of the main beam at the starting bridge piers of each span.

[0008] Furthermore, both the general assembly joints and the relay assembly joints are epoxy resin glue joints, and there are no wet joints or cast-in-place closure segments in the main beam.

[0009] Furthermore, the main beam precast segments include general precast segments, pier top precast segments, first beam end precast segments, and last beam end precast segments.

[0010] Furthermore, the pier top precast segments include the first pier top precast segment and other pier top precast segments.

[0011] Furthermore, the first pier top precast segment is the starting segment for assembly, and the construction errors are adjusted through the mortar cushion layer thickness of the bearing pads at other pier top precast segments, first beam end precast segments, and last beam end precast segments and the anchor bolt holes of the bearings.

[0012] Furthermore, a temporary consolidation structure for the pier and beam is provided at the first precast pier top segment, and no such temporary consolidation structure is required at the other precast pier top segments.

[0013] A construction method for a prestressed concrete continuous beam bridge with span-by-span assembly without wet joints includes the following steps:

[0014] A. Construct the first precast pier top segment

[0015] Install the first precast pier top segment and its corresponding bearing, accurately position it, and perform the temporary consolidation operation for the pier and beam at the first precast pier top segment;

[0016] B. Assemble the other precast main beam segments of the first span of the main beam

[0017] Along the assembly direction, sequentially assemble the other precast main beam segments of the first span of the main beam to the first beam end precast segment;

[0018] C. Continue the assembly

[0019] Continue the assembly until reaching the relay assembly joint of the second span of the main beam;

[0020] D. Grout the bearing and tension the prestress

[0021] Stop the assembly, grout the bearing at the top of the first pier, tension the prestress of the main beam assembled for the first time, and grout the pressure;

[0022] E. Conduct the second assembly

[0023] Sequentially assemble from the relay assembly joint of the second span to the relay assembly joint of the third span of the main beam;

[0024] F. Grout the bearing again and tension the prestress

[0025] Stop the assembly, grout the bearing at the top of the third pier, tension the prestress of the main beam assembled for the second time, and grout the pressure;

[0026] G. Repeat the construction

[0027] Repeat the above construction steps until reaching the relay assembly joint of the nth span;

[0028] H. Construct to the last beam end precast segment

[0029] Sequentially assemble from the relay assembly joint of the nth span to the last beam end precast segment;

[0030] I. Finally, grout the bearing to form the bridge

[0031] Grout the bearing at the top of the (n + 1)th pier, tension the prestress of the main beam assembled for the nth time, and grout the pressure to form the bridge.

[0032] The present invention realizes a 100% prefabrication and assembly rate for the continuous beam section.

[0033] The precast segments of the main beam of the present invention are all prefabricated in the factory and integrally assembled on site, ensuring the construction quality and construction efficiency.

[0034] The present invention has no wet joints and cast-in-place closure segments, improving the degree of standardization, industrialization, mechanization, and informatization of operations. Brief Description of the Drawings

[0035] Figure 1 Schematic diagram of the overall structure of the present invention;

[0036] Figure 2 Flow chart of the construction method of the present invention;

[0037] Figure 3 Schematic diagram of installing the first precast segment at the pier top in the present invention;

[0038] Figure 4 Schematic diagram of the first assembly in the present invention;

[0039] Figure 5 Schematic diagram of the completion of the first assembly in the present invention;

[0040] Figure 6 Schematic diagram of the second assembly in the present invention;

[0041] Figure 7 Schematic diagram of the completion of the second assembly in the present invention;

[0042] Figure 8 Schematic diagram of the nth assembly in the present invention;

[0043] Figure 9 Schematic diagram of the completion of the nth assembly in the present invention;

[0044] Figure 10 Schematic diagram of the cross-sectional layout of the middle legs and segment hoisting in the segment assembly bridge building machine of the present invention;

[0045] Wherein:

[0046] 1 Pier 11 The first pier

[0047] 12 The second pier 13 The third pier

[0048] 1n The nth pier 1(n + 1) The (n + 1)th pier

[0049] 2 Main beam 21 The first span of the main beam

[0050] 22 The second span of the main beam 2(n - 1) The (n - 1)th span of the main beam

[0051] The nth span of the 2n main girders, the 3rd precast segment of the main girder

[0052] 4 Precast segments at pier tops, 41 The first precast segment at pier tops

[0053] 42 Other precast segments at pier tops, 5 The first precast segment at the beam end

[0054] 6 The last precast segment at the beam end, 7 General assembly joints

[0055] 8 Relay assembly joints, 9 Bearings

[0056] 10 Segment assembly bridge erector. Detailed implementation manners

[0057] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0058] As Figures 1 to 10 shown, a prestressed concrete continuous beam bridge with no wet joints and erected span by span includes a main girder 2 and piers 1 that support the main girder 2. The main girder 2 is a multi-span prestressed concrete continuous beam. The main girder 2 and the piers 1 are connected by bearings 9. The main girder 2 is divided into several precast segments 3 of the main girder along the longitudinal bridge direction, and adjacent precast segments 3 of the main girder are connected by assembly joints.

[0059] Among them, the main girder 2 is an n-span (n≥2) prestressed concrete continuous beam, and the number of piers 1 is n + 1.

[0060] The main girder 2 is a constant-depth beam.

[0061] The main girder 2 is spliced by a segment assembly bridge erector 10, adopting the erection process of span by span, and the number of times of span-by-span erection of the main girder is n times.

[0062] The assembly joints include general assembly joints 7 and relay assembly joints 8.

[0063] The relay assembly joint 8 is arranged near the moment zero point of the main girder at the starting pier of each span.

[0064] Both the general assembly joint 7 and the relay assembly joint 8 are epoxy resin glue joints, and there are no wet joints and cast-in-place closure segments in the main girder 2.

[0065] The precast segments 3 of the main girder include general precast segments, precast segments 4 at pier tops, precast segments 5 at the first beam end, and precast segments 6 at the last beam end.

[0066] The precast segments 4 at pier tops include the first precast segment 41 at pier tops and other precast segments 42 at pier tops.

[0067] The first precast pier-top segment 41 is the starting segment for assembly. The construction errors are adjusted by the mortar cushion thickness of the bearing pads at the other precast pier-top segments 42, the first girder-end precast segment 5, and the last girder-end precast segment 6 and the bearing anchor bolt holes.

[0068] A temporary pier-girder consolidation structure is provided at the first precast pier-top segment 41, and no temporary pier-girder consolidation structure is required at the other precast pier-top segments 42.

[0069] A construction method for a prestressed concrete continuous beam bridge with non-wet joints and span-by-span assembly includes the following steps:

[0070] A. Construct the first precast pier-top segment

[0071] Install the first precast pier-top segment 41 and its corresponding bearing 9, accurately position it, and perform the temporary pier-girder consolidation operation at the first precast pier-top segment 41;

[0072] B. Assemble the other main girder precast segments of the first span of the main girder

[0073] Along the assembly direction, sequentially assemble the other main girder precast segments of the first span 21 of the main girder to the first girder-end precast segment 5;

[0074] C. Continue the assembly

[0075] Continue the assembly until reaching the relay assembly joint 8 of the second span 22 of the main girder;

[0076] D. Grout the bearings and tension the prestress

[0077] Stop the assembly, grout the bearings at the top of the first pier 11, tension the prestress of the main girder assembled for the first time, and grout the ducts;

[0078] E. Perform the second assembly

[0079] Sequentially assemble from the relay assembly joint 8 of the second span to the relay assembly joint 8 of the third span of the main girder;

[0080] F. Grout the bearings again and tension the prestress

[0081] Stop the assembly, grout the bearings at the top of the third pier 13, tension the prestress of the main girder assembled for the second time, and grout the ducts;

[0082] G. Repeat the construction

[0083] Repeat the above construction steps until reaching the relay assembly joint 8 of the nth span;

[0084] H. Construct to the last girder-end precast segment

[0085] Sequentially assemble from the relay assembly joint 8 of the nth span to the last girder-end precast segment 6;

[0086] I. Final Pier Grouting and Bridge Completion

[0087] Grout the bearings at the top of the (n + 1)-th pier 1(n + 1), tension the prestress of the main girder assembled for the n-th time and grout the ducts, then complete the bridge.

[0088] Another Embodiment

[0089] A prestressed concrete continuous beam bridge with no wet joints and erected span by span includes a main girder 2 and piers 1 supporting the main girder 2. The main girder 2 is a multi-span prestressed concrete continuous beam. The main girder 2 is connected to the piers 1 through bearings 9. The main girder 2 is longitudinally divided into several precast segments 3 of the main girder, and adjacent precast segments 3 of the main girder are connected by assembly joints.

[0090] Among them, the main girder 2 is an n-span (n≥2) prestressed concrete continuous beam, and the number of piers 1 is n + 1.

[0091] In this embodiment, the main girder 2 is a variable-depth beam with the middle support locally heightened.

[0092] The main girder 2 is spliced by a segment assembly bridge erector 10, adopting the erection process of span by span, and the number of times of span-by-span erection of the main girder is n times.

[0093] The assembly joints include general assembly joints 7 and relay assembly joints 8.

[0094] The relay assembly joints 8 are arranged near the moment zero points of the main girder at the starting piers of each span.

[0095] Both the general assembly joints 7 and the relay assembly joints 8 are epoxy resin adhesive joints, and there are no wet joints and cast-in-place closure segments in the main girder 2.

[0096] The precast segments 3 of the main girder include general precast segments, pier-top precast segments 4, first girder-end precast segments 5, and last girder-end precast segments 6.

[0097] The pier-top precast segments 4 include the first pier-top precast segment 41 and other pier-top precast segments 42.

[0098] The first pier-top precast segment 41 is the starting segment for assembly, and the construction errors are adjusted by the mortar cushions of the bearing pads and the anchor bolt holes of the bearings at the other pier-top precast segments 42, first girder-end precast segments 5, and last girder-end precast segments 6.

[0099] A temporary pier-girder consolidation structure is provided at the first pier-top precast segment 41, and no temporary pier-girder consolidation structure is required at the other pier-top precast segments 42.

[0100] The relay assembly joint 8 for segment-by-segment assembly is arranged near the moment zero point of the main girder of the nth span 2n (n≥2) of the main girder, close to the nth pier 1n.

[0101] All the precast segments 3 of the main girder are precast in the factory.

[0102] The permanent splicing of the precast segments 3 of the main girder is realized through in-body prestress or external prestress or combined in-body and external prestress.

[0103] The piers 1 are, in the order of assembly, the 1st pier 11, the 2nd pier 12, the 3rd pier 13, the nth pier 1n, and the (n + 1)th pier 1(n + 1).

[0104] Correspondingly, the multiple spans are: the 1st span 21 of the main girder, the 2nd span 22 of the main girder, the (n - 1)th span 2(n - 1) of the main girder, and the nth span 2n of the main girder.

[0105] A construction method for a prestressed concrete continuous beam bridge with segment-by-segment assembly without wet joints includes the following steps:

[0106] A. Construct the first precast segment at the pier top

[0107] Install the first precast segment 41 at the pier top and its corresponding bearing 9, accurately position it, and conduct the temporary consolidation operation of the pier and beam at the first precast segment 41 at the pier top.

[0108] B. Assemble the other precast segments of the 1st span of the main girder

[0109] Assemble the other precast segments of the 1st span 21 of the main girder in sequence along the assembly direction until the first beam-end precast segment 5.

[0110] C. Continue the assembly

[0111] Continue the assembly until reaching the relay assembly joint 8 of the 2nd span 22 of the main girder.

[0112] D. Grout the bearing and tension the prestress

[0113] Stop the assembly, grout the bearing at the top of the 1st pier 11, tension the prestress of the main girder assembled for the first time, and grout the pressure.

[0114] E. Conduct the second assembly

[0115] Assemble in sequence from the relay assembly joint 8 of the 2nd span to the relay assembly joint 8 of the 3rd span of the main girder.

[0116] F. Grout the bearing again and tension the prestress

[0117] Stop the assembly, grout the bearing at the top of the 3rd pier 13, tension the prestress of the main girder assembled for the second time, and grout the pressure.

[0118] G. Repeated construction

[0119] Repeat the above construction steps until the relay assembly joint 8 of the nth span is constructed;

[0120] H. Construction to the precast segment at the end beam

[0121] Assemble in sequence from the relay assembly joint 8 of the nth span to the precast segment 6 at the end beam;

[0122] I. Finally, grout the bearing to complete the bridge

[0123] Grout the bearing at the top of the (n + 1)th pier 1(n + 1), tension the prestress of the main beam assembled for the nth time and grout the ducts, and complete the bridge.

[0124] Among them, when the permanent prestress is tensioned, the corresponding stage bearing 9 must participate in the overall force.

[0125] The precast segments of the main beam are precast, cured and stored in the factory to reduce the later shrinkage and creep deformation.

[0126] The joint surface of the precast segment 3 of the main beam must be cleaned, the loose layer on the concrete surface shall be removed, and the surface shall be dry before applying glue.

[0127] The prestressed duct adopts the auxiliary vacuum grouting process, and a rust inhibitor is added to the duct grouting material.

[0128] Generally, no tensile stress shall occur in the general assembly joint 7 and the relay assembly joint 8 during the whole construction and operation process.

[0129] After the installation of the precast segment 3 of the main beam and before the tensioning of the permanent prestress, effective measures shall be taken to ensure that the self - weight of each segment is borne by the bridge - building machine, and prevent the joint surface of the non - tensioned permanent prestress from cracking due to force.

[0130] The construction of the glue joint between the precast segments 3 of the main beam shall adopt a reasonable construction process. Before the prestress is tensioned, structural deformation and internal force changes shall be avoided, and measures against sun exposure and rain and snow shall be taken.

[0131] During the segment assembly process, effective measures shall be taken to avoid the adverse effects of the deck temperature difference of the assembled structure on the subsequent segments to be assembled, and the monitoring shall be strengthened.

[0132] All the precast segments of the main beam are precast in the factory, and the construction quality is guaranteed.

[0133] In the present invention, the precast segments of the main beam are all precast in the factory and integrally assembled on site, ensuring the construction quality and construction efficiency.

[0134] The present invention has no wet joints and cast - in - place closure segments, improving the degree of standardization, industrialization, mechanization and informatization of the operation.

Claims

1. A prestressed concrete continuous beam bridge with non-wet joints assembled span by span, comprising a main beam (2) and bridge piers (1) that support the main beam (2), characterized in that: The main beam (2) is a multi-span prestressed concrete continuous beam. The main beam (2) is connected to the pier (1) through a bearing (9). The main beam (2) is longitudinally divided into several precast segments of the main beam (3), and adjacent precast segments of the main beam (3) are connected by assembly joints. The assembly joints include general assembly joints (7) and relay assembly joints (8). The relay assembly joint (8) is arranged near the moment zero point of the main beam at the starting pier of each span. Both the general assembly joint (7) and the relay assembly joint (8) are epoxy resin glue joints, and there are no wet joints and cast-in-place closure segments in the main beam (2).

2. A prestressed concrete continuous beam bridge assembled span by span without wet joints according to claim 1, characterized in that: The precast segment of the main beam (3) includes a general precast segment, a pier-top precast segment (4), a first beam-end precast segment (5), and a last beam-end precast segment (6).

3. A prestressed concrete continuous beam bridge assembled span by span without wet joints according to claim 2, characterized in that: The pier-top precast segment (4) includes a first pier-top precast segment (41) and other pier-top precast segments (42).

4. A prestressed concrete continuous beam bridge assembled span by span without wet joints according to claim 3, characterized in that: The first pier-top precast segment (41) is the starting segment for assembly. The construction error is adjusted by the mortar cushion thickness of the bearing pad stone and the anchor bolt holes of the bearing at the other pier-top precast segments (42), the first beam-end precast segment (5), and the last beam-end precast segment (6).

5. A prestressed concrete continuous beam bridge assembled span by span without wet joints according to claim 4, characterized in that: A temporary pier-beam consolidation structure is provided at the first pier-top precast segment (41), and no temporary pier-beam consolidation structure is required at the other pier-top precast segments (42).

6. A construction method for a prestressed concrete continuous beam bridge assembled span by span without wet joints, characterized in that: It includes the following steps: (A) Construct the first pier-top precast segment Install the first pier-top precast segment (41) and its corresponding bearing (9), accurately position it, and perform the temporary pier-beam consolidation operation at the first pier-top precast segment (41). (B) Assemble the other precast segments of the main beam in the first span Along the assembly direction, sequentially assemble the other precast segments of the main beam in the first span (21) to the first beam-end precast segment (5). (C) Continue the assembly Continue the assembly until reaching the relay assembly joint (8) of the second span (22) of the main beam. (D) Grout the bearing and tension the prestress Stop the assembly, grout the bearing at the top of the first pier (11), tension the prestress of the main beam assembled for the first time, and grout the pressure. (E) Perform the second assembly Sequentially assemble from the relay assembly joint (8) of the second span to the relay assembly joint (8) of the third span of the main beam. (F) Grout the bearing again and tension the prestress Stop the assembly, grout the bearing at the top of the third pier (13), tension the prestress of the main beam assembled for the second time, and grout the pressure. (G) Repeat the construction Repeat the above construction steps until reaching the relay assembly joint (8) of the nth span. (H) Construct to the last beam-end precast segment Sequentially assemble from the relay assembly joint (8) of the nth span to the last beam-end precast segment (6). (I) Finally, grout the bearing to form the bridge Grout the bearing at the top of the (n + 1)th pier (1(n + 1)), tension the prestress of the main beam assembled for the nth time, and grout the pressure to form the bridge.

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