CN111088759B - Construction method for steel strand of side span closure section of cast-in-place beam cast by cantilever - Google Patents
Construction method for steel strand of side span closure section of cast-in-place beam cast by cantilever Download PDFInfo
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- CN111088759B CN111088759B CN201911346517.5A CN201911346517A CN111088759B CN 111088759 B CN111088759 B CN 111088759B CN 201911346517 A CN201911346517 A CN 201911346517A CN 111088759 B CN111088759 B CN 111088759B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
Abstract
The invention relates to the field of bridge construction, aims to solve the problems of high economic cost and high quality control difficulty of the existing construction process of prestressed steel strands of a side-span closure section, and provides a construction method of steel strands of the side-span closure section of a cantilever casting beam, wherein when the side-span closure section is constructed, steel strands at a P anchor position are penetrated and buried in advance, and the steel strands penetrating through the closure section and the cantilever section are reserved; the corrugated pipes at the side span cast-in-place section and the cantilever section are respectively provided with exposed reserved corrugated pipes; when the side span closure section is constructed, the reserved steel strand is threaded in place; meanwhile, the longitudinal corrugated pipe arranged on the closure section is lapped with the reserved corrugated pipe when the cast-in-place section and the cantilever section are constructed, and the lapping position is tightly wound by using an adhesive tape; after the construction of the corrugated pipe is finished, supplementary grouting pipes are uniformly arranged on two sides of the joint surface of the closure section. The invention has the advantages of simple and convenient construction, small influence and change on the bridge structure and no damage to the bridge structure.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to a construction method for casting a steel strand at a closure section of a cast-in-place beam side span by a cantilever.
Background
At present, the construction of the prestressed steel strand of the side span closure section of the cast-in-place beam cast in cantilever mainly adopts the steps that the anchoring end of the steel strand of the side span linear section part is changed to be a tensioning end anchorage device, the tensioning end anchorage device and a clamping piece with the same type are arranged during tensioning, the structure still adopts single-end tensioning, and the tensioning property is unchanged. After the steel strand is replaced with the anchorage at the tensioning end, the anchorage at the tensioning end and the reserved notch are installed during construction of the closure section, and the steel strand is strung and tensioned after the side span is closed.
The main problem of the process is that part of P anchor of the cast-in-place section is changed into tension anchor, so that the position of an anchoring end (the end head of the cast-in-place section) needs to be grooved. The width of the slot is required to meet the width of an anchor box of the tensioning anchor, and is generally not less than 40 cm; the depth of the groove is determined according to the construction condition, if the wiring at the two ends is not finished, the use requirement can be met by about 15cm, if the wiring at the two ends is finished, the depth of the groove at least reaches more than 50cm, the length of the groove is full-length, and the manual operation is convenient.
Because the size of the open slot is very large, the steel bars on the section of the original cast-in-place section are broken more, the quality of the steel bar engineering cannot be ensured, particularly under the condition that the wiring at the two ends is already constructed, the operation space is narrow, and the recovery processing difficulty of the broken steel bars is higher; the quality of the concrete anchor seal can also be ensured because personnel and machines cannot be arranged in place. Finally, the process has the problems of high economic cost, high quality control difficulty, low working efficiency and the like.
Disclosure of Invention
The invention aims to provide a construction method for a steel strand of a side-span closure section of a cast-in-place cantilever beam, and aims to solve the problems of high economic cost, high quality control difficulty and low working efficiency of the existing construction process for the prestressed steel strand of the side-span closure section.
The embodiment of the invention is realized by the following steps:
a method for constructing steel strands of a side span closure section of a cantilever casting cast-in-place beam is characterized in that when the side span cast-in-place section is constructed, steel strands at a P anchor position are penetrated and embedded in advance, and steel strands penetrating through the closure section and the cantilever section are reserved; wrapping and protecting the exposed part of the steel strand, placing an unexpanded steel strand disc on the ground or a side span cast-in-place section, and carrying out support and covering treatment on the steel strand disc; the corrugated pipes at the side span cast-in-place section and the cantilever section are respectively provided with exposed reserved corrugated pipes;
when the side span closure section is constructed, the reserved steel strand is threaded in place, the closure section wraps the steel strand of the closure section after the corrugated pipe with the diameter larger than that of the designed steel strand corrugated pipe is cut in half and tightly under the condition that the steel strand is threaded completely, and the cut corrugated pipe is wound tightly; meanwhile, overlapping the cut corrugated pipe arranged on the closure section with a reserved corrugated pipe during construction of the side span cast-in-place section and the cantilever section, and tightly winding the overlapping position by using an adhesive tape;
after the construction of the corrugated pipe is finished, supplementary grouting pipes are uniformly arranged on two sides of the joint surface of the closure section.
The construction method for the steel strand of the side span closure section of the cast-in-place beam cast by the cantilever in the embodiment is simple and convenient to construct, has small influence and change on the bridge structure, and does not damage the bridge structure. Meanwhile, the process has wide applicability, and can be used for the construction of the steel strand of the cantilever casting closure section under different construction boundary conditions. The steel strand construction and grouting quality are controllable, and the measure materials and the using equipment are field materials, so that the economic performance is better, and the construction efficiency is higher.
In one embodiment:
the length of the exposed reserved corrugated pipe is 15-20 cm.
In one embodiment:
the overlapping length of the cut corrugated pipe of the closure section, the side span cast-in-place section and the cantilever section is not less than 10 cm.
In one embodiment:
the corrugated pipe used for cutting and wrapping the steel strand of the closure section is one size larger than the corrugated pipe for designing the steel strand.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings referred to in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of construction of a steel strand of a cast-in-place section;
FIG. 2 is a schematic diagram of construction of a steel strand of a side span closure section;
FIG. 3 is a schematic view of adding a supplementary grouting pipe.
Icon: 11-side span cast-in-place section; 12-P anchor; 13-steel strand wires; 14-closure section; 15-cantilever section; 16-color stripe cloth; 17-a steel strand disc; 18-reserving a corrugated pipe; 19-make-up grouting pipe; 20-cut bellows.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, the terms are only used for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms "first," "second," and the like in the description of the present invention are only used for distinguishing between the descriptions and are not intended to indicate or imply relative importance.
Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present invention do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1, in the construction method of the steel strand of the side-span closure section of the cast-in-place beam cast by the cantilever according to the embodiment, when the side-span cast-in-place section is constructed, the steel strand at the P anchor position (the anchoring end of the steel strand) is penetrated and embedded in advance, and the steel strand penetrating through the closure section and the cantilever section is reserved; wrapping and protecting the exposed part of the steel strand by using color strip cloth, placing an undeployed steel strand disc on the ground or a side span cast-in-place section, and carrying out support and covering treatment on the steel strand disc to prevent the steel strand from being rusted; the corrugated pipes at the side span cast-in-place section and the cantilever section are respectively provided with exposed reserved corrugated pipes; in the embodiment, the length of the exposed reserved corrugated pipe is 15-20 cm;
when the side span closure section is constructed, the reserved steel strand is threaded in place, the closure section wraps the steel strand of the closure section after the corrugated pipe 20 with the diameter larger than that of the designed steel strand corrugated pipe is cut in half and is tightly wound under the condition that the steel strand is threaded; optionally, the corrugated pipe used for cutting and wrapping the steel strand of the closure segment is larger than the corrugated pipe of the design steel strand by one, for example, for the corrugated pipe of the design steel strand with the diameter of 70cm, the corrugated pipe used for cutting can be selected to be a corrugated pipe with the diameter of 80cm larger by one; meanwhile, overlapping the cut corrugated pipe arranged on the closure section with a reserved corrugated pipe during construction of the side span cast-in-place section and the cantilever section, and tightly winding the overlapping position by using an adhesive tape; optionally, the overlapping length of the cut corrugated pipe of the closure section, the side span cast-in-place section and the cantilever section is not less than 10 cm;
after the construction of the corrugated pipe is finished, the slurry leakage problem can be caused due to poor connection quality of the corrugated pipe at the closing section, and the design and use requirements cannot be met by the grouting quality of the side-span cast-in-place section and the closing section prestressed pipeline easily caused by the slurry leakage problem. Therefore, after the corrugated pipe is wrapped, the supplementary grouting pipes are uniformly arranged on two sides of the joint surface of the closure section, and the grouting quality of the whole prestressed pipeline is ensured.
The construction method for the steel strand of the side span closure section of the cast-in-place beam cast by the cantilever in the embodiment is simple and convenient to construct, has small influence and change on the bridge structure, and does not damage the bridge structure. Meanwhile, the process has wide applicability, and can be used for the construction of the steel strand of the cantilever casting closure section under different construction boundary conditions. The steel strand construction and grouting quality are controllable, and the measure materials and the using equipment are field materials, so that the economic performance is better, and the construction efficiency is higher.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A construction method for casting a steel strand of a side span closure section of a cast-in-place beam by a cantilever is characterized by comprising the following steps:
when the construction of the side span cast-in-place section is carried out, the steel strand at the P anchor position is penetrated and embedded in advance, and the steel strand penetrating through the closure section and the cantilever section is reserved; wrapping and protecting the exposed part of the steel strand, placing an unexpanded steel strand disc on the ground or a side span cast-in-place section, and carrying out support and covering treatment on the steel strand disc; the corrugated pipes at the side span cast-in-place section and the cantilever section are respectively provided with exposed reserved corrugated pipes;
when the side span closure section is constructed, the reserved steel strand is threaded in place, the closure section wraps the steel strand of the closure section after the corrugated pipe with the diameter larger than that of the designed steel strand corrugated pipe is cut in half and tightly under the condition that the steel strand is threaded completely, and the cut corrugated pipe is wound tightly; meanwhile, overlapping the cut corrugated pipe arranged on the closure section with a reserved corrugated pipe during construction of the side span cast-in-place section and the cantilever section, and tightly winding the overlapping position by using an adhesive tape;
after the construction of the corrugated pipe is finished, supplementary grouting pipes are uniformly arranged on two sides of the joint surface of the closure section.
2. The method for constructing the steel strand of the side span closure section of the cast-in-place cantilever beam according to claim 1, wherein the method comprises the following steps:
the length of the exposed reserved corrugated pipe is 15-20 cm.
3. The method for constructing the steel strand of the side span closure section of the cast-in-place cantilever beam according to claim 1, wherein the method comprises the following steps:
the overlapping length of the cut corrugated pipe of the closure section, the side span cast-in-place section and the cantilever section is not less than 10 cm.
4. The method for constructing the steel strand of the side span closure section of the cast-in-place cantilever beam according to claim 1, wherein the method comprises the following steps:
the corrugated pipe used for cutting and wrapping the steel strand of the closure section is one size larger than the corrugated pipe for designing the steel strand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911346517.5A CN111088759B (en) | 2019-12-24 | 2019-12-24 | Construction method for steel strand of side span closure section of cast-in-place beam cast by cantilever |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911346517.5A CN111088759B (en) | 2019-12-24 | 2019-12-24 | Construction method for steel strand of side span closure section of cast-in-place beam cast by cantilever |
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| Publication Number | Publication Date |
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| CN111088759A CN111088759A (en) | 2020-05-01 |
| CN111088759B true CN111088759B (en) | 2021-03-12 |
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| CN113123245A (en) * | 2021-04-19 | 2021-07-16 | 长江勘测规划设计研究有限责任公司 | Method for constructing post-installation prestressed corrugated pipe of concrete beam bridge cast-in-place closure section |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2963764A (en) * | 1950-07-06 | 1960-12-13 | Dyckerhoff & Widmann Ag | Constructing a prestressed concrete bridge |
| JP5189545B2 (en) * | 2009-04-01 | 2013-04-24 | 三井住友建設株式会社 | Bridge erection method |
| CN202658536U (en) * | 2012-04-11 | 2013-01-09 | 中铁三局集团有限公司 | Device for synchronous construction of continuous girder bridge cantilever side span cast-in-situ section and folding section |
| KR20160150155A (en) * | 2015-06-18 | 2016-12-29 | 지에스건설 주식회사 | Fcm construction method using divided pouring light weight concrete for segment |
| CN105926443A (en) * | 2016-04-21 | 2016-09-07 | 中铁十七局集团第二工程有限公司 | Construction method for continuous rigid frame side span by first girder installation and then closure |
| CN107119574B (en) * | 2017-06-27 | 2018-08-21 | 中交第三航务工程局有限公司 | A kind of Cantilever Construction Method of arch rib bridge girder |
| CN107724239A (en) * | 2017-09-14 | 2018-02-23 | 中铁十九局集团第二工程有限公司 | Super-length prestressed beam construction method |
| CN109944170A (en) * | 2019-05-06 | 2019-06-28 | 重庆建工市政交通工程有限责任公司 | Continuous beam with high-pier end bay Cast-in-Situ Segment and closure section integrated construction system and construction method |
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