阅读说明：本技术 一种边跨无湿接缝节段预制悬臂拼装连续梁的施工方法 (A kind of construction method of the end bay without wet seam precast segment free cantilever erection continuous beam ) 是由 孙峻岭 董传新 雷文斌 马成林 代彬艺 于 2019-09-06 设计创作，主要内容包括：本发明为边跨无湿接缝节段预制悬臂拼装连续梁的施工方法,连续梁包括梁体及墩柱,梁体划分为若干中跨及两端边跨,每个中跨划分为2n个中跨预制节段,边跨划分为若干边跨预制节段,墩柱包括多个中墩及两端边墩；步骤为：安装各中墩的中墩墩顶0号节段,为每个中墩设置墩顶临时固结设施；从每个中墩的中墩墩顶0号节段两侧方向依次对称拼装每个中跨的2n个中跨预制节段；对相邻两个中跨间的合龙段湿接缝浇筑混凝土；对每个边跨的边跨预制节段进行施工,安装全桥预应力钢束,张拉预应力钢束,对预应力管道进行压浆,解除各中墩的墩顶临时固结设施,完成桥梁体系转换。本发明减少合龙段,减少施工步骤、现场混凝土浇筑工作量,提高施工效率。(The present invention is construction method of the end bay without wet seam precast segment free cantilever erection continuous beam, continuous beam includes beam body and pier stud, beam body, which is divided into several, bridgees across both ends end bay, across being divided into 2n across prefabricated subsection in each, end bay is divided into several end bay prefabricated subsections, and pier stud includes multiple middle piers and both ends abutment pier；Step are as follows: pier top temporary consolidation facility is arranged for each middle pier in No. 0 segment of middle pier pier top of each middle pier of installation；From No. 0 two side direction of segment of middle pier pier top of each middle pier successively it is symmetrical it is assembled it is each in across 2n in across prefabricated subsection；To in two neighboring across the wet seam casting concrete of closure section；It constructs to the end bay prefabricated subsection of each end bay, full-bridge prestressed strand is installed, stretch-draw prestressing force steel beam carries out mud jacking to prestress pipe, releases the pier top temporary consolidation facility of each middle pier, completes bridge system transform.The present invention reduces closure section, reduces construction procedure, cast-in-place concrete workload, improves construction efficiency.)

1. a kind of construction method of end bay without wet seam precast segment free cantilever erection continuous beam, which is characterized in that the side built Across including beam body and pier stud without wet seam precast segment free cantilever erection continuous beam, beam body, which is divided into several, bridgees across both ends end bay, Across being divided into 2n across prefabricated subsection in each, it is each in the left and right sides of pier have in n respectively across prefabricated subsection, adjacent two The wet seam of closure section is set across between in a, and end bay is divided into several end bay prefabricated subsections, and pier stud includes multiple middle piers and both ends Abutment pier；

If it is No. 0 segment of middle pier pier top that the pier top segment of pier, which is compiled, in each, and therefrom No. 0 segment of pier pier top starts respectively to the left Right two sides in each across n in sequentially arrange in numerical order across prefabricated subsection；

The construction method the following steps are included:

A, No. 0 segment of middle pier pier top of each middle pier is installed, and pier top temporary consolidation facility is set for each middle pier；

B, from No. 0 two side direction of segment of the middle pier pier top of each middle pier, it is successively symmetrical assembled each in across 2n in across prefabricated Segment；

C, concreting is carried out to the wet seam of closure section in two neighboring across between；

D, it constructs to the end bay prefabricated subsection of each end bay, full-bridge prestressed strand, stretch-draw prestressing force steel beam, to pre- is installed Stress pipeline carries out mud jacking, releases the pier top temporary consolidation facility of each middle pier, completes bridge system transform.

2. construction method according to claim 1, which is characterized in that set therefrom No. 0 segment of pier pier top and start respectively to the left Right two sides in each across n in sequentially arrange in numerical order across prefabricated subsection be in first across in prefabricated subsection, second across prefabricated section Section ... is across prefabricated subsection in n-th；Multiple middle piers are pier in first, pier in pier ... m in second；

The step B includes the following steps:

B1, promoted in first simultaneously on the left of pier first in across in first on the right side of pier in prefabricated subsection and first across prefabricated section Section, and be placed on pier top temporary support facility, accurate adjustment contraposition carries out interim prestressed stretch-draw and splicing, glue to be spliced After solidification, permanent prestressed strand is worn, carries out permanent prestressed stretch-draw；

B2, step B1 is repeated, completes across prefabricated subsection installation in first of two side direction of pier in second；

B3, promoted in the second of the first two sides Zhong Dun simultaneously across prefabricated subsection, in the second of the first two sides Zhong Dun across prefabricated section The symmetrical splicing of Duan Jinhang, interim and permanent prestressed stretch-draw, pumping of prostressed duct；

B4, repeat step B3, successively in symmetrical assembly first in 3~n of two side direction of pier across prefabricated subsection；

B5, repeat step B3~B4, successively in symmetrical assembly second in 3~n of two side direction of pier across prefabricated subsection；

B6, step B1~B5 is repeated, completes third assembly across prefabricated subsection in each n of two side direction of pier into m.

3. construction method according to claim 2, which is characterized in that the assembled process across prefabricated subsection includes in each Splicing, interim and permanent prestressed stretch-draw, pumping of prostressed duct.

4. construction method according to claim 2, which is characterized in that in step B, using spanning equipment to each two sides Zhong Dun It is each in promoted across prefabricated subsection.

5. construction method according to claim 1, which is characterized in that set both ends abutment pier as the first abutment pier and the second abutment pier, Both ends end bay is divided into the (n+1)th end bay prefabricated subsection for being not provided with wet seam, the n-th+2 side the n-th+L of end bay prefabricated subsection ... Across prefabricated subsection, the n-th+L end bay prefabricated subsection is located at the pier top of abutment pier；L is less than n；Step D includes the following steps:

The (n+1)th end bay prefabricated subsection of D1, the first abutment pier of synchronous lifting and the second abutment pier, splicing, are worn forever the interim prestressing force of tensioning Long prestressed strand and the permanent prestressing force of tensioning；

D2, the n-th+L end bay prefabricated subsection for lifting the first abutment pier and the second abutment pier, and it is placed on temporary support seat by corresponding pier On；

D3, the n-th+2 end bay prefabricated subsection for lifting the first abutment pier, the second abutment pier, splicing, the interim prestressing force of tensioning；

D4, step D3 is repeated, completes the assembly of the n-th+3 to n-th+L-1 end bay prefabricated subsection；

The n-th+L end bay prefabricated subsection of D5, the first abutment pier of lifting and the second abutment pier pier top, splicing exactitude position, tensioning are temporarily pre- After stress, permanent support positioning, anchor hole and adjustment layer grouting；

D6, installation full-bridge prestressed strand, stretch-draw prestressing force steel beam carry out mud jacking to prestress pipe, release the pier of each middle pier Temporary consolidation facility is pushed up, bridge system transform is completed.

Technical field

The present invention relates to method for bridge construction, specially construction of the end bay without wet seam precast segment free cantilever erection continuous beam Method.

Background technique

Precast segment assembling technique is longitudinally split by beam body into several segments, in factory or at the construction field (site) according to predetermined Design scheme carry out it is prefabricated, by segmental erection it is in place after, stretch-draw prestressing force steel beam, which gets up each section assembling, becomes complete Beam body.Nowadays the connecting method between beam sections mostly use adhesive for concrete be bonded bonding mode or for segment between in advance The wet of armored concrete is stayed to connect mode.Bonding mode is chiefly used between precast segment block, and the wet mode that connects then is chiefly used in precast segment Between block and non-precast segment block, that is, fragment position of joining the two sections of a bridge, etc.

In prefabrication and assembly construction bridge common at present, end bay closure section and midspan closing section are still applied using cast-in-place mode Work, there are still certain rising spaces for this kind of bridge prefabrication rate, and when the construction of wet seam, are limited by field condition, closure section construction Quality is difficult to control；Set up the duration of the processes such as template, assembling reinforcement, casting concrete, concrete curing, form removal in scene It is longer.In addition, the wet seam precision of closure section is not high and speed is slower, construction efficiency is still to be improved.

Summary of the invention

The purpose of the present invention is to solve the technical problem in above-mentioned background technique, propose a kind of end bay without wet seam section The construction method of the prefabricated free cantilever erection continuous beam of section.

The present invention adopts the following technical scheme: a kind of construction party of end bay without wet seam precast segment free cantilever erection continuous beam Method, the end bay built include beam body and pier stud without wet seam precast segment free cantilever erection continuous beam, and beam body is divided into several Bridge across both ends end bay, it is each in across being divided into 2n across prefabricated subsection, it is two neighboring in the wet seam of closure section is set across between, End bay is divided into several end bay prefabricated subsections, and pier stud includes multiple middle piers and both ends abutment pier；

If it is No. 0 segment of middle pier pier top that the pier top segment of pier, which is compiled, in each, and therefrom No. 0 segment of pier pier top starts to distinguish To the left and right two sides in each across n in sequentially arrange in numerical order across prefabricated subsection；

The construction method the following steps are included:

A, No. 0 segment of middle pier pier top of each middle pier is installed, and pier top temporary consolidation facility is set for each middle pier；

B, from No. 0 two side direction of segment of the middle pier pier top of each middle pier, it is successively symmetrical assembled each in across 2n in across Prefabricated subsection；

C, concreting is carried out to the wet seam of closure section in two neighboring across between；

D, it constructs to the end bay prefabricated subsection of each end bay, installation full-bridge prestressed strand, stretch-draw prestressing force steel beam, Mud jacking is carried out to prestress pipe, releases the pier top temporary consolidation facility of each middle pier, completes bridge system transform.

In preferred embodiments, above-mentioned construction method sets therefrom No. 0 segment of pier pier top and starts to distinguish two sides to the left and right To in each across n in sequentially arrange in numerical order across prefabricated subsection be in first across in prefabricated subsection, second across prefabricated subsection ... Across prefabricated subsection in n-th；Multiple middle piers are pier in first, pier in pier ... m in second；

The step B includes the following steps:

B1, promoted in first simultaneously on the left of pier first in across in first on the right side of pier in prefabricated subsection and first across prefabricated Segment, and be placed on pier top temporary support facility, accurate adjustment contraposition carries out interim prestressed stretch-draw and splicing, to be spliced After adhesive curing, permanent prestressed strand is worn, carries out permanent prestressed stretch-draw；

B2, step B1 is repeated, completes across prefabricated subsection installation in first of two side direction of pier in second；

B3, promoted in the second of the first two sides Zhong Dun simultaneously across prefabricated subsection, in the second of the first two sides Zhong Dun across pre- Segment processed carries out symmetrical splicing, interim and permanent prestressed stretch-draw, pumping of prostressed duct；

B4, repeat step B3, successively in symmetrical assembly first in 3~n of two side direction of pier across prefabricated subsection；

B5, repeat step B3~B4, successively in symmetrical assembly second in 3~n of two side direction of pier across prefabricated subsection；

B6, step B1~B5 is repeated, completes third assembly across prefabricated subsection in each n of two side direction of pier into m.

Preferably, above-mentioned construction method sets both ends abutment pier as the first abutment pier and the second abutment pier, and both ends end bay is divided into not The (n+1)th end bay prefabricated subsection, n-th+2 end bay prefabricated subsection ... the n-th+L end bay prefabricated subsection of wet seam, the n-th side+L are set It is located at the pier top of abutment pier across prefabricated subsection；L is less than n；

Step D includes the following steps:

The (n+1)th end bay prefabricated subsection of D1, the first abutment pier of synchronous lifting and the second abutment pier, splicing, the interim prestressing force of tensioning, Wear permanent prestressed strand and the permanent prestressing force of tensioning；

D2, the n-th+L end bay prefabricated subsection for lifting the first abutment pier and the second abutment pier, and it is placed on interim branch by corresponding pier It supports on seat；

D3, the n-th+2 end bay prefabricated subsection for lifting the first abutment pier, the second abutment pier, splicing, the interim prestressing force of tensioning；

D4, step D3 is repeated, completes the assembly of the n-th+3 to n-th+L-1 end bay prefabricated subsection；

The n-th+L end bay prefabricated subsection of D5, the first abutment pier of lifting and the second abutment pier pier top, splicing exactitude position, tensioning are faced When prestressing force after, the positioning of permanent support, anchor hole and adjustment layer grouting；

D6, installation full-bridge prestressed strand, stretch-draw prestressing force steel beam carry out mud jacking to prestress pipe, release each middle pier Pier top temporary consolidation facility, complete bridge system transform.

Compared with the prior art, the advantages of the present invention are as follows:

1, the present invention reduces construction procedure by the setting of reduction closure section, reduces cast-in-place concrete workload, into And construction efficiency is improved, accelerate construction progress；

2, Cast-in-Situ Segment of the present invention is few, improves the prefabricated rate of bridge subsection, realizes the rapid implementation of bridge greenery construction.

Detailed description of the invention

Fig. 1 is that structure and segment of the end bay without wet seam precast segment free cantilever erection continuous beam divide schematic diagram；

Fig. 2 is the construction schematic diagram that end bay installs No. 0 segment of pier top without wet seam precast segment free cantilever erection continuous beam；

Fig. 3 is the construction that end bay sets up No. 1 segment without pier " T " structure beam section in wet seam precast segment free cantilever erection continuous beam Schematic diagram；

Fig. 4 is the construction that end bay sets up No. 3 segments without pier " T " structure beam section in wet seam precast segment free cantilever erection continuous beam Schematic diagram；

Fig. 5 is end bay without No. 4-No. 8 segments of pier " T " structure beam section erection in wet seam precast segment free cantilever erection continuous beam Construction schematic diagram；

Fig. 6 is construction schematic diagram of the end bay without wet seam precast segment free cantilever erection continuous beam midspan closing section；

Fig. 7 is construction schematic diagram of the end bay without No. 9 segments of wet seam precast segment free cantilever erection continuous beam end bay beam section；

Fig. 8 is construction schematic diagram of the end bay without No. 11 segments of wet seam precast segment free cantilever erection continuous beam end bay beam section；

Fig. 9 is the flow chart of construction method of the present invention；

In figure: 1 is beam body, and 2 be pier stud, and 3 be spanning equipment, and 4 be temporary support seat by middle pier pier, and 5 be to face by abutment pier pier When support base, 11 be in across 12 be end bay, and 13 be No. 0 segment of middle pier pier top, and 21 be No. 1 abutment pier, and 22 be pier in No. 2, and 23 be 3 Pier in number, 24 be pier in No. 4, and 25 be No. 5 abutment piers, 111 be in across prefabricated subsection, 112 be the wet seam of closure section, 121 be end bay Prefabricated subsection.

Specific embodiment

The present invention is described in further detail with reference to the accompanying drawings and examples, but embodiments of the present invention are not limited to This.