CN114319118A - Construction method of cast-in-situ hidden beam pier top block applied to segmental beam structure bridge - Google Patents
Construction method of cast-in-situ hidden beam pier top block applied to segmental beam structure bridge Download PDFInfo
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- CN114319118A CN114319118A CN202111612361.8A CN202111612361A CN114319118A CN 114319118 A CN114319118 A CN 114319118A CN 202111612361 A CN202111612361 A CN 202111612361A CN 114319118 A CN114319118 A CN 114319118A
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- 238000010276 construction Methods 0.000 title claims abstract description 30
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 7
- 210000002435 tendon Anatomy 0.000 claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
The invention relates to the technical field of bridge construction, and discloses a construction method of a cast-in-place hidden beam pier top block applied to a bridge with a segmental beam structure, which comprises the following steps: designing prestress, namely designing temporary prestress before construction; manufacturing a pier top block, namely building a temporary support according to temporary prestress, prepressing, carrying out encrypted measurement, setting a hidden beam to manufacture pre-camber, and finishing cast-in-place manufacturing of the pier top block; tensioning the hidden beam, and sequentially tensioning the permanent prestress and the temporary prestress of the hidden beam to a design value after the concrete strength of the pier top block reaches the design value; and (3) stretching the prestressed tendons, placing the bridge erecting machine on the hidden cross beam, suspending and hoisting all the segmental girders, stretching the prestressed tendons in the body, and finally stretching the full conjuncted external tendons. The invention is suitable for a construction method of a cast-in-situ hidden beam pier top block applied to a segmental beam structure bridge.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a construction method of a cast-in-place hidden beam pier top block applied to a bridge with a segmental beam structure.
Background
With the development of bridge industry in China, segment beam construction technology is continuously advanced and mature, different systems of 'simply supported and then continuous' and 'span-by-span continuous' are arranged on the structure and prestress design, multiple construction methods such as 'cantilever assembly' and 'full-suspension assembly' are arranged on the installation method, a pier top block is usually connected with two spans in a prefabricated installation mode through wet joints and other designs. With the diversification of bridge structure design, the existing design of the pier top block of the sectional beam presents a hidden beam mode of combining a pier top beam and the sectional beam, and a transverse and longitudinal prestress system is usually arranged in the pier top block. The hidden beam transverse bridge prestress is uniformly distributed on the lower edge, and in the construction stage of cast-in-place manufacturing, if all the hidden beam prestress is tensioned at one time, the tensile stress of the top surface of the beam is over-limited; if the step tensioning is adopted, the load of a bridge girder erection machine and the load applied by the front and rear section girders need to be considered, so that the operation difficulty is greatly improved; meanwhile, under the action of multidirectional prestress and the stepping working condition of the bridge girder erection machine, the stress of the hidden cross beam is more complicated.
Disclosure of Invention
The invention provides a construction method of a cast-in-situ hidden beam pier top block applied to a bridge with a segmental beam structure, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a construction method of a cast-in-situ hidden beam pier top block applied to a segmental beam structure bridge comprises the following steps:
designing prestress, namely designing temporary prestress before construction;
manufacturing a pier top block, namely building a temporary support according to temporary prestress, prepressing, carrying out encrypted measurement, setting a hidden beam to manufacture pre-camber, and finishing cast-in-place manufacturing of the pier top block;
tensioning the hidden beam, and sequentially tensioning the permanent prestress and the temporary prestress of the hidden beam to a design value after the concrete strength of the pier top block reaches the design value;
stretching the prestressed tendons, positioning a bridge erecting machine station on the hidden cross beam, suspending and hoisting all the segmental girders, stretching the prestressed tendons in the body, and finally stretching the full conjuncted external tendons;
and judging whether the cable is released or not, and judging whether the cable needs to be released or not according to the bridge forming state and the stress calculation result in the operation stage.
As a preferred technical scheme of the invention, the upper part of the crossbeam is provided with a longitudinal temporary prestressed tendon.
As a preferred technical scheme of the invention, a plurality of X-shaped straight prestressed tendons are uniformly distributed on the upper edge of the cross beam.
The invention has the following advantages:
(1) the problem that an auxiliary support is required to be erected at a station position of a bridge girder erection machine in a narrow space due to the fact that a conventional process cannot directly stand on a pier top block during construction of erecting a segmental girder by the bridge girder erection machine is solved;
(2) the hidden beam can ensure the safety of the hidden beam structure under the action of multidirectional prestress and the stepping working condition of the bridge girder erection machine;
(3) the permanent prestress designed in the hidden beam body can complete prestress tension work at one time under complex working conditions;
(4) through the arrangement of the cross anchors along the bridge direction, the problem of collision of longitudinal and transverse prestressed pipelines can be avoided, and the stress of the whole structure is ensured;
(5) the construction process flow of the cast-in-place hidden beam of the segment beam pier top block is simplified, the construction cost is saved, and the construction progress is accelerated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross section diagram of a temporary prestress design in a construction method of a cast-in-place hidden beam pier top block applied to a segmental beam structure bridge.
In the figure: 1. a hidden beam; 2. temporary prestressed tendons; 3. segment beam prestressing tendons; 4. the hidden beam is designed with a prestressed tendon.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In one embodiment, referring to fig. 1, the position relationship among the hidden beam, the temporary tendons, the segment beam tendons and the hidden beam design tendons is shown.
A construction method of a cast-in-situ hidden beam pier top block applied to a segmental beam structure bridge comprises the following steps:
designing prestress, namely designing temporary prestress before construction, and rechecking and calculating relevant working conditions;
manufacturing a pier top block, namely building a temporary support according to temporary prestress, prepressing, carrying out encrypted measurement, setting hidden beam manufacturing pre-camber according to prepressing data, ensuring safe precision matching of a later-stage prestressed pipeline, and finishing cast-in-place manufacturing of the pier top block;
tensioning the hidden beam, and sequentially tensioning the permanent prestress and the temporary prestress of the hidden beam to the design value after the concrete strength of the pier top block reaches the design value, wherein the tensioning sequence is as follows according to a supported project: 1-1(1-1 ') → 1-2 (1-2 ') → 1-3(1-2 ') → 2-1(2-1 ') → 2-2(2-2 ') → 2-3(2-3 ') → 2-4 (2-4 ') → 3-1(3-1 ') → 3-2(3-2 ') → 3-3(3-3 ') → 3-4(3-3 '), and attention should be paid to the symmetry of the tensioning;
stretching the prestressed tendons, positioning a bridge erecting machine station on the hidden cross beam, suspending and hoisting all the segmental girders, stretching the prestressed tendons in the body, and finally stretching the full conjuncted external tendons;
and judging whether the cable is released or not, and judging whether the cable needs to be released or not according to the bridge forming state and the stress calculation result in the operation stage. And if the cable needs to be released, the internal prestress of the temporary hidden beam is relieved.
In one case of this embodiment, a longitudinal (transverse) temporary tendon is added to the top of the beam to resist the tensile stress of the top edge, and at the same time, an empirical calculation is needed to check that N X-type straight tendons (the control stress under the anchor is YMPa) are uniformly arranged on the top edge, and the center line of the prestress is at a distance Xcm from the top surface, so that after the whole prestress of the beam is stretched in place at one time, it is necessary to check whether the newly added tendon of the tension-stressed beam does not exist on the top edge of the beam under the self-weight (if the tendon is not released, whether the stress of the top and bottom edges of the beam is exceeded under the worst load combination during construction and operation).
In one case of this embodiment, the hidden beam pier top block is cast into a whole in advance, the segment box girder web bundles cannot be anchored inside the hidden beam shell, and the anchoring design of the segment girder prestress system at the hidden beam adopts a cross anchoring mode.
Cross anchor design principle:
a. the anchor point longitudinal bridge moves forwards to the surface of the adjacent cross-hidden cross beam, the anchor point moves vertically downwards to ensure that the top ZF1 prestressed beam has enough anchoring and tensioning space and moves transversely to the inside of the box girder, and the anchor point moves to the surface of the cross beam from the web plate;
b. anchor points on two sides of the cross beam are asymmetrically arranged and vertically staggered so as to avoid intersecting at the spatial position of the prestressed tendons in the cross beam;
and c, the ZF1 bundles only have flat bending in the beam, so that anchor points on the surface of the beam have no elevation angle, the tensioning space of the prestressed bundles is ensured, and the rest steel bundles have both flat bending and vertical bending in the beam.
The cross anchor scheme has the advantages that the web plate bundles and the bottom plate connecting bundles do not conflict with the space positions of transverse prestressed bundles (including the beam top plate bundles) in the beam, and reasonable bundle distribution can be theoretically realized.
The pier top block of the segmental beam is usually designed into a prefabricated structure, the invention provides a hidden beam formed by combining a pier top beam and the segmental beam, and a cast-in-place construction method is adopted. The method is characterized in that a transverse bridge is arranged at the top of the hidden beam during cast-in-place manufacturing, and after the temporary prestress and the permanent prestress are tensioned, supporting legs can directly act on the cast-in-place hidden beam during the process of erecting a segmental beam by a bridge erecting machine; the hidden cross beam can ensure the structure safety under the action of multidirectional prestress and the stepping working condition of the bridge girder erection machine; permanent prestress designed in the hidden beam body can finish tensioning in advance at one time under the complex working condition; and by combining the design of a cross anchor, the mode of avoiding the conflict of transverse and longitudinal prestressed pipelines and ensuring the stress of the whole structure when the hidden beam is manufactured is avoided, the hidden beam construction process of the sectional beam is simplified, the hidden beam construction of the sectional beam can be completed safely and efficiently, the engineering cost under the construction condition is reduced, the use stability of the hidden beam under the complex working condition is improved, and the force transmission of the structure is safer.
The invention is suitable for a construction method of a cast-in-place hidden beam pier top block applied to a bridge with a segmental beam structure, and the method is characterized in that temporary internal prestress is arranged at the top of a hidden beam during cast-in-place manufacturing of the hidden beam, so that the hidden beam can complete permanent prestress tensioning at one time in the construction stage, the hidden beam structure can be ensured to be safe under the action of multidirectional prestress and the stepping working condition of a bridge girder erection machine, and the collision of longitudinal and transverse prestressed pipelines is avoided by the design of cross anchors during manufacturing of the hidden beam, and the stress of the whole structure is ensured.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (3)
1. A construction method of a cast-in-situ hidden beam pier top block applied to a segmental beam structure bridge is characterized by comprising the following steps:
designing prestress, namely designing temporary prestress before construction;
manufacturing a pier top block, namely building a temporary support according to temporary prestress, prepressing, carrying out encrypted measurement, setting a hidden beam to manufacture pre-camber, and finishing cast-in-place manufacturing of the pier top block;
tensioning the hidden beam, and sequentially tensioning the permanent prestress and the temporary prestress of the hidden beam to a design value after the concrete strength of the pier top block reaches the design value;
stretching the prestressed tendons, positioning a bridge erecting machine station on the hidden cross beam, suspending and hoisting all the segmental girders, stretching the prestressed tendons in the body, and finally stretching the full conjuncted external tendons;
and judging whether the cable is released or not, and judging whether the cable needs to be released or not according to the bridge forming state and the stress calculation result in the operation stage.
2. The method as claimed in claim 1, wherein the beam has a temporary longitudinal tendon at the upper portion thereof.
3. The method as claimed in claim 1, wherein a plurality of X-shaped straight prestressing tendons are uniformly arranged on the upper edge of the beam.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111612361.8A CN114319118A (en) | 2021-12-27 | 2021-12-27 | Construction method of cast-in-situ hidden beam pier top block applied to segmental beam structure bridge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111612361.8A CN114319118A (en) | 2021-12-27 | 2021-12-27 | Construction method of cast-in-situ hidden beam pier top block applied to segmental beam structure bridge |
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| CN114319118A true CN114319118A (en) | 2022-04-12 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160150154A (en) * | 2015-06-18 | 2016-12-29 | 지에스건설 주식회사 | Fcm construction method using divided pouring of segment concrete |
| CN112609577A (en) * | 2020-11-23 | 2021-04-06 | 中国水利水电第四工程局有限公司 | Continuous beam segment prefabrication and assembly method |
| CN113512932A (en) * | 2021-03-19 | 2021-10-19 | 宁波市政工程建设集团股份有限公司 | Prestressed steel beam connected prefabricated small box girder type hidden cover beam and construction method thereof |
| CN113622309A (en) * | 2021-07-29 | 2021-11-09 | 中交二公局第三工程有限公司 | Prefabricated section beam side span less support assembling structure and construction method |
| CN113638304A (en) * | 2021-07-13 | 2021-11-12 | 宁波市政工程建设集团股份有限公司 | Concrete beam type bridge hidden cover beam structure system and construction method thereof |
| CN113652966A (en) * | 2021-07-13 | 2021-11-16 | 宁波市政工程建设集团股份有限公司 | Construction method of full-prefabricated assembly type concrete beam type bridge structure system |
-
2021
- 2021-12-27 CN CN202111612361.8A patent/CN114319118A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160150154A (en) * | 2015-06-18 | 2016-12-29 | 지에스건설 주식회사 | Fcm construction method using divided pouring of segment concrete |
| CN112609577A (en) * | 2020-11-23 | 2021-04-06 | 中国水利水电第四工程局有限公司 | Continuous beam segment prefabrication and assembly method |
| CN113512932A (en) * | 2021-03-19 | 2021-10-19 | 宁波市政工程建设集团股份有限公司 | Prestressed steel beam connected prefabricated small box girder type hidden cover beam and construction method thereof |
| CN113638304A (en) * | 2021-07-13 | 2021-11-12 | 宁波市政工程建设集团股份有限公司 | Concrete beam type bridge hidden cover beam structure system and construction method thereof |
| CN113652966A (en) * | 2021-07-13 | 2021-11-16 | 宁波市政工程建设集团股份有限公司 | Construction method of full-prefabricated assembly type concrete beam type bridge structure system |
| CN113622309A (en) * | 2021-07-29 | 2021-11-09 | 中交二公局第三工程有限公司 | Prefabricated section beam side span less support assembling structure and construction method |
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