CN102561204A - Construction method for inserting super-long steel stranded wires before pouring of bridge body - Google Patents

Abstract

The invention discloses a construction method for inserting super-long steel stranded wires before pouring of a bridge body. The method comprises the following working flows of: fixing a corrugated pipe positioning framework on a beam supporting framework; processing a corrugated pipe, reserving a half pipe skylight on the corrugated pipe, and installing the corrugated pipe; cutting the steel stranded wires, and bundling the steel stranded wires in groups; gradually inserting the bundled steel stranded wires under the traction of a windlass; and covering the corrugated pipe skylight. The method solves the problems that the corrugated pipe has high flexibility and is easily broken and blocked, the prestressed steel stranded wires are positioned inaccurately and the like when the steel stranded wires are inserted before the concrete is poured; the construction method is simple, and low in manpower equipment input; the steel stranded wire bundle which consists of 17 steel stranded wires with the length of 73 meters can be inserted within one hour by a 5-ton slow windlass, positioning deviation of the prestressed steel stranded wires is not produced, the corrugated pipe is not damaged, the work efficiency is greatly improved, and the method has high using value.

Description

, bridge penetrates the job practices of overlength steel strand before building

Technical field

The present invention relates to a kind of before bridge is built the job practices of steel strand, specifically be a kind of job practices of before bridge is built, wearing the overlength steel strand, belong to railway, highway bridge construction construction field.

Background technology

Development along with highway in China, railway traffic; Especially big bridge is more and more; Particularly in bridge constructions such as municipal highway viaduct, special line for passenger trains station viaduct, special line for passenger trains track switch continuous beam; The especially big continuous box girder bridge of multispan one is more and more, and prestress wire need pass two usually and stride above box girder body, and the length of prestress wire is generally all more than 70m; Owing to receive the restriction of bridge construction characteristic; The beam body concrete can't penetrate prestress wire after building, and super-length prestressed steel strand must penetrate before box girder body concrete is built, and before prestress wire penetrates, had the difficulty of following several respects: the one, do not water the beam body to build before the concrete; The little flexibility of prestress pipe rigidity that penetrates steel strand is big, penetrates steel strand by the whole bundle of conventional method and is prone to cause prestress pipe damaged; The 2nd, before the casting beams body concrete, do not penetrate steel strand by the whole bundle of conventional method and be prone to cause the bellows position to squint, cause prestress wire space orientation inaccurate easily, it is stressed to influence the beam body; The 3rd, the prestress steel twist line length is longer, penetrates steel strand by the whole bundle of conventional method and is prone in bellows, stop up.Highway, the continuous bridge of railway and simply supported beam are on project organization at present; The overwhelming majority is after the beam body concrete has been built, to penetrate steel strand; Job practices is comparative maturity also; And for the bridge of special construction, requirement must penetrate steel strand before the beam body concrete built, and before bridge is built, wore the job practices of overlength steel strand at present and did not also appear in the newspapers.

Summary of the invention

The objective of the invention is to disclose a kind of before continuous box girder beam body concrete is built; Efficiently carry out the job practices that super-length prestressed steel strand penetrate apace; With difficulties such as overcoming flexible big, the cracky of the bellows that penetrates steel strand before the concreting and run into, be prone to stop up, the prestress wire location is inaccurate, to satisfy the requirement of engineering construction.

Workflow of the present invention is:

A. colligation beam body support frame, fixing bellows location skeleton on beam body support frame;

B. machining bellows, and on bellows, reserve semicanal bellows skylight, bellows is installed;

C. cut steel strand, and the grouping harness;

D. low speed winch haulage cable, the steel strand of the harness that divides into groups progressively to penetrate repeat the lashing program, and the steel strand of in every bellows, setting all penetrate;

E. adopt semicanal as the bellows capping, the bellows skylight of reserving is covered, the lashing operation of steel strand is accomplished.

The invention solves the beam body concrete and build the lashing difficult problem of super-length prestressed steel strand before, to the steel strand lashing of length more than 100 meters, better effects if; Have very high use value, job practices is simple, and it is few to drop into manpower equipment; Penetrate the steel wire bundle that length 73m is made up of 17 steel strand, 5 tons of low speed winch promptly can be accomplished in one hour, and can not cause the deviations of prestress wire; Can not cause the breakage of bellows yet, improve operating efficiency greatly.

Description of drawings

Accompanying drawing 1 is the layout sketch map of super-length prestressed bundle bellows of the present invention at Liang Tizhong.

Accompanying drawing 2 is A-A profiles of accompanying drawing 2.

Accompanying drawing 3 is B-B profiles of accompanying drawing 2.

Description of reference numerals is following:

Beam body support frame 1, bellows location skeleton 2, bellows 3, bellows skylight 4, steel strand 5, haulage cable 6, low speed winch 7, bellows capping 8, bellows penetrate end 9, steel strand fixed end 10.

The specific embodiment

Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:

The specific embodiment of the invention is following:

A. welding or colligation groined type bellows location skeleton (2) on beam body support frame is located bellows for skeleton (2) spacing and is encrypted to 1/2nd of design pitch;

B. go up the spacing that penetrates sixth to five/one of steel strand length according to plan at bellows (3) and reserve semicanal bellows skylight (4); Then bellows (3) is penetrated in the location skeleton (2); In bellows (3), penetrate haulage cable (6); The joint of per two sections bellowss (3) adopts adhesive tape to tightly wrap, and cement paste bleeds in the bellows when preventing concreting;

C. according to design length cutting steel strand (5); Because it is very long to intend the steel strand that penetrate, weight is very heavy, divides into groups intending the steel strand (5) that penetrate in the every bellows (3); With three or four steel strand (5) is one group of harness; Weight can drag with hoist engine and be advisable, and the end that penetrates of every bundle steel strand (5) tightly wraps with adhesive tape, guarantees that steel strand (5) termination can not puncture bellows (3);

D. the steel strand (5) of harness are dragged to bellows and penetrate end (9) and hang on the haulage cable (6), it is dilatory to start low speed winch (7), penetrates end (9) at bellows and locates to assist and penetrate; Simultaneously locate to observe penetrating of steel strand (5) in bellows skylight (4); When finding to stop up, locate to pull steel strand (5), penetrate into steel strand fixed end (10) up to steel strand (5) in bellows skylight (4); Then steel strand (5) are fixed; Repeat to penetrate program, carry out penetrating of next group steel strand (5) again, the steel strand of in this bellows (3), setting (5) all penetrate;

E. adopt semicanal as bellows capping (8); The bellows skylight of reserving (4) is covered; With adhesive tape with bellows capping (8) with seal under bellows (3) tightly wrap; Then the bellows (3) that penetrates steel strand (5) is checked that after the no breakage of affirmation whole piece bellows (3), the lashing operation of steel strand (5) is accomplished.

Claims (2)

1. before bridge is built, penetrate the job practices of overlength steel strand, it is characterized in that being undertaken by following workflow:

A. colligation beam body support frame (1) is gone up fixedly bellows location skeleton (2) at beam body support frame (1);

B. machining bellows (3), and go up at bellows (3) and to reserve semicanal bellows skylight (4), bellows (3) is installed;

C. cut steel strand (5), and the grouping harness;

D. low speed winch (7) haulage cable (6), the steel strand (5) of the harness that divides into groups progressively to penetrate repeat the lashing program, and the steel strand (5) of setting all penetrate in every bellows (3);

E. adopt semicanal as bellows capping (8), the bellows skylight of reserving (4) is covered, the lashing operation of steel strand (5) is accomplished.

2. the job practices that before bridge is built, penetrates the overlength steel strand according to claim 1 is characterized in that:

A. welding or colligation groined type bellows location skeleton (2) on beam body support frame is located bellows for skeleton (2) spacing and is encrypted to 1/2nd of design pitch;

B. go up the spacing that penetrates sixth to five/one of steel strand length according to plan at bellows (3) and reserve semicanal bellows skylight (4); Then bellows (3) is penetrated in the location skeleton (2); In bellows (3), penetrate haulage cable (6); The joint of per two sections bellowss (3) adopts adhesive tape to tightly wrap, and cement paste bleeds in the bellows when preventing concreting;

C. according to design length cutting steel strand (5); Because it is very long to intend the steel strand that penetrate, weight is very heavy, divides into groups intending the steel strand (5) that penetrate in the every bellows (3); With three or four steel strand (5) is one group of harness; Weight can drag with hoist engine and be advisable, and the end that penetrates of every bundle steel strand (5) tightly wraps with adhesive tape, guarantees that steel strand (5) termination can not puncture bellows (3);

D. the steel strand (5) of harness are dragged to bellows and penetrate end (9) and hang on the haulage cable (6), it is dilatory to start low speed winch (7), penetrates end (9) at bellows and locates to assist and penetrate; Simultaneously locate to observe penetrating of steel strand (5) in bellows skylight (4); When finding to stop up, locate to pull steel strand (5), penetrate into steel strand fixed end (10) up to steel strand (5) in bellows skylight (4); Then steel strand (5) are fixed; Repeat to penetrate program, carry out penetrating of next group steel strand (5) again, the steel strand of in this bellows (3), setting (5) all penetrate;

E. adopt semicanal as bellows capping (8); The bellows skylight of reserving (4) is covered; With adhesive tape with bellows capping (8) with seal under bellows (3) tightly wrap; Then the bellows (3) that penetrates steel strand (5) is checked that after the no breakage of affirmation whole piece bellows (3), the lashing operation of steel strand (5) is accomplished.

Images