CN112095477A - Construction method of prefabricated segmental beam - Google Patents
Construction method of prefabricated segmental beam Download PDFInfo
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- CN112095477A CN112095477A CN202010981533.8A CN202010981533A CN112095477A CN 112095477 A CN112095477 A CN 112095477A CN 202010981533 A CN202010981533 A CN 202010981533A CN 112095477 A CN112095477 A CN 112095477A
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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
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Abstract
The invention discloses a construction method of an assembled prefabricated segmental beam, and belongs to the technical field of highway bridge construction. By adopting the construction technology, the invention a avoids the problem that land acquisition problems in southeast Asia cannot meet the requirements of a large precast beam factory; b. the beam pieces are assembled by adopting segmented prefabricated segments, so that the weight of the beam pieces is reduced, and the beam pieces are easy to transport; c. longitudinal beam pieces are connected in a prefabricating mode and arranged through male pins and female pins, so that the overall linear type of the segmental beam is guaranteed, and meanwhile, the connection strength is also guaranteed; d. during construction, longitudinal beam pieces are assembled at each section by adopting high-strength-ratio glue-doped cement paste, so that each section is connected more firmly; e. the transverse and longitudinal jacks are adopted for jacking to enable the connection of all the section beams to be tighter, so that the connection is simpler and more effective.
Description
Technical Field
The invention relates to the technical field of highway bridge engineering construction, in particular to a construction method of an assembled prefabricated segmental beam.
Background
At present, with the acceleration of the urbanization progress and the reduction of the population dividend of China, the construction engineering field presents the characteristics of high construction quality requirement, increased labor cost and high energy-saving and environment-friendly requirements, and the development of an assembly type building is urgently needed to realize transformation upgrading of the building industry and modernization of the building industry.
The southeast Asia highway project built by our company has less project investment due to the influence of geographical environment and the influence of local government offices and living standards, has more restriction factors of site construction conditions, particularly has unfavorable concrete transportation conditions due to the limitation of regional materials, adopts integrally poured concrete and is influenced by local land acquisition, and a precast beam factory with larger area is difficult and has limited space.
According to the investigation on the aspect of precast beams in China, a segment prefabrication related construction method, a related hoisting installation method and a line type segmented prefabrication installation method controlled by coordinate adjustment are found. How to avoid the safety risk of installation in the work progress to and how to guarantee the installation quality after the segmentation is prefabricated, the quality guarantee of piecing together the quality assurance of festival department and the connection quality of assembling all are the factor that the technical staff considered, how to avoid appearing quality and safety problem, is worth the problem that we studied.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a construction method of an assembly type prefabricated segmental beam.
In order to achieve the purpose, the invention adopts the following technical scheme:
a construction method of an assembled prefabricated segmental beam comprises the following steps:
A1. prefabricating segmented beam pieces in a prefabrication plant, wherein each beam piece is divided into an edge span, a middle span and an edge span, holes of male and female pins are reserved at one end part of a flange plate of the edge span opposite to the middle span and two end parts of a flange plate of the middle span, when concrete is poured, steel sleeves and steel pins are respectively inserted into the reserved holes of the male and female pins, the steel sleeves and the steel pins are used in a set to form the male and female pins, and the position of each steel sleeve corresponding to the longitudinal edge span or the middle span is a steel pin installation position;
A2. hoisting the steel truss in place on site, wherein the erection position is between two tie beams of the bridge, and the steel truss is supported on the two tie beams by steel pipe supports;
A3. installing a temporary support at the position designed by the installation drawing and measuring the elevation to ensure that the top end of the steel truss is consistent with the elevation of the top surface of the temporary support;
A4. then, the sectional beams are transported to the site, beam pieces forming the sectional beams are pushed one by one along the steel truss according to numbers to be in place, in the process of pushing one by one, the correspondence of male pins and female pins is maintained between every two longitudinal beam pieces, and the transverse beam pieces are pushed to ensure that the distance of 5cm is kept between every two transverse beam pieces;
A5. when all the beam pieces of the equal-span segmental beam are pushed onto the steel truss, penetrating steel strands, and manually penetrating the transverse beam pieces by adopting one end to pull and the other end;
A6. smearing high-strength proportioned cement paste with rubber between transverse beam sheets, then simultaneously primarily tensioning two ends of the segmental beam, and keeping the integral line shape of the segmental beam unchanged in the primary tensioning process;
A7. then formally tensioning, after the pre-camber meets the requirement, the beam piece at the middle section is in a state of being separated from the steel truss and the temporary support, the beam pieces at two ends of the segmental beam are temporarily supported by square timber or a steel backing plate at the position of the temporary support on the tie beam through a jack, and the steel truss is moved to the next span station;
A8. then, performing pipeline grouting, and when the strength meets the requirement, performing transverse and longitudinal jacking on the beam pieces of the section beam by adopting a jack, wherein the longitudinal jacking enables the beam pieces to be matched through male and female pins, and the transverse jacking of each beam piece is tightly combined through high-strength proportioned adhesive cement slurry; meanwhile, in the process of transverse jacking, attention needs to be paid to timely cleaning of overflow of the high-strength proportioning cementitious cement slurry at the joint of the beam and the slab;
A9. and after all the sections of beam pieces are jacked in place and the line shape of the integral section beam meets the requirement, jacking the two ends of the section beam by using a jack, replacing the permanent support on the tie beam, and then carrying out installation construction of the next span section beam.
According to a further preferable scheme of the invention, the steel pin extends out of the beam piece of the side span or the midspan by 5-9 cm.
Compared with the prior art, the invention has the following beneficial effects:
by adopting the construction technology, the problem that land acquisition problems in southeast Asia regions cannot meet the requirements of a factory for prefabricating large beams is avoided; b. the beam pieces are assembled by adopting segmented prefabricated segments, so that the weight of the beam pieces is reduced, and the beam pieces are easy to transport; c. longitudinal beam pieces are connected in a prefabricating mode and arranged through male and female pins, so that the overall line type of the sectional beam is guaranteed, and meanwhile, the connection strength is also guaranteed; d. during construction, longitudinal beam pieces are assembled at each section by adopting high-strength-ratio glue-doped cement paste, so that each section is connected more firmly; e. the transverse and longitudinal jacks are adopted for jacking to enable the connection of all the section beams to be tighter, so that the connection is simpler and more effective.
By adopting a series of techniques and improvement of the construction process, the construction of the large-span bridge is simpler and more convenient, meanwhile, because of prefabrication in advance, the concrete quality of the beam piece is guaranteed, the appearance quality is excellent, and the construction period is effectively guaranteed. Is worthy of popularization and application.
Detailed Description
A construction method of an assembled prefabricated segmental beam comprises the following steps:
A1. prefabricating segmented beam plates in a prefabrication plant, wherein each beam plate is divided into an edge span, a middle span and an edge span, holes of male and female pins are reserved at one end part of a flange plate of the edge span opposite to the middle span and two end parts of a flange plate of the middle span, when concrete is poured, steel sleeves and steel pins are respectively inserted into the reserved holes of the male and female pins, the steel sleeves and the steel pins are used in a set to form the male and female pins, the thickness of the steel sleeves is generally 5mm, the steel pins D is 5cm, the end faces of the extending beam plates are 5cm, and the position of each steel sleeve corresponding to the longitudinal edge span or the middle span is a steel pin installation position;
A2. hoisting the steel truss in place on site, wherein the erection position is between two tie beams of the bridge, and the steel truss is supported on the two tie beams by steel pipe supports;
A3. installing a temporary support at the position designed by the installation drawing and measuring the elevation to ensure that the top end of the steel truss is consistent with the elevation of the top surface of the temporary support;
A4. then, the sectional beams are transported to the site, beam pieces forming the sectional beams are pushed one by one along the steel truss according to numbers to be in place, in the process of pushing one by one, the correspondence of male pins and female pins is maintained between every two longitudinal beam pieces, and the transverse beam pieces are pushed to ensure that the distance of 5cm is kept between every two transverse beam pieces;
A5. when all the beam pieces of the equal-span segmental beam are pushed onto the steel truss, penetrating steel strands, and manually penetrating the transverse beam pieces by adopting one end to pull and the other end;
A6. smearing high-strength proportioned cement paste with rubber between transverse beam sheets, then simultaneously primarily tensioning two ends of the segmental beam, and keeping the integral line shape of the segmental beam unchanged in the primary tensioning process;
A7. then formally tensioning, after the pre-camber meets the requirement, the beam piece at the middle section is in a state of being separated from the steel truss and the temporary support, the beam pieces at two ends of the segmental beam are temporarily supported by square timber or a steel backing plate at the position of the temporary support on the tie beam through a jack, and the steel truss is moved to the next span station;
A8. then, performing pipeline grouting, and when the strength meets the requirement, performing transverse and longitudinal jacking on the beam pieces of the section beam by adopting a jack, wherein the longitudinal jacking enables the beam pieces to be matched through male and female pins, and the transverse jacking of each beam piece is tightly combined through high-strength proportioned adhesive cement slurry; meanwhile, in the process of transverse jacking, attention needs to be paid to timely cleaning of overflow of the high-strength proportioning cementitious cement slurry at the joint of the beam and the slab;
A9. and after all the sections of beam pieces are jacked in place and the line shape of the integral section beam meets the requirement, jacking the two ends of the section beam by using a jack, replacing the permanent support on the tie beam, and then carrying out installation construction of the next span section beam.
By adopting the assembly type sectional prefabrication and installation construction method, the installation quality of the sectional beam is effectively improved, the construction period is shortened, the smoothness of the overall line shape between the sections of the sectional beam is ensured, the installation quality is effectively ensured, the on-site construction efficiency is high, the concrete strength is guaranteed, the apparent quality is attractive, and the method is worthy of popularization and application.
The invention has the following beneficial effects:
by adopting the construction technology, the problem that land acquisition problems in southeast Asia regions cannot meet the requirements of a factory for prefabricating large beams is avoided; b. the beam pieces are assembled by adopting segmented prefabricated segments, so that the weight of the beam pieces is reduced, and the beam pieces are easy to transport; c. longitudinal beam pieces are connected in a prefabricating mode and arranged through male and female pins, so that the overall line type of the sectional beam is guaranteed, and meanwhile, the connection strength is also guaranteed; d. during construction, longitudinal beam pieces are assembled at each section by adopting high-strength-ratio glue-doped cement paste, so that each section is connected more firmly; e. the transverse and longitudinal jacks are adopted for jacking to enable the connection of all the section beams to be tighter, so that the connection is simpler and more effective.
By adopting a series of techniques and improvement of the construction process, the construction of the large-span bridge is simpler and more convenient, meanwhile, because of prefabrication in advance, the concrete quality of the beam piece is guaranteed, the appearance quality is excellent, and the construction period is effectively guaranteed. Is worthy of popularization and application.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto. The substitution may be of partial structures, devices, method steps, or may be a complete solution. The technical solution and the inventive concept thereof according to the present invention should be equally replaced or changed within the protection scope of the present invention.
Claims (2)
1. A construction method of an assembled prefabricated segmental beam is characterized by comprising the following steps:
A1. prefabricating segmented beam pieces in a prefabrication plant, wherein each beam piece is divided into an edge span, a middle span and an edge span, holes of male and female pins are reserved at one end part of a flange plate of the edge span opposite to the middle span and two end parts of a flange plate of the middle span, when concrete is poured, steel sleeves and steel pins are respectively inserted into the holes of the male and female pins, the steel sleeves and the steel pins are used in a set to form the male and female pins, and the position of each steel sleeve corresponding to the longitudinal edge span or the middle span is a steel pin installation position;
A2. hoisting the steel truss in place on site, wherein the erection position is between two tie beams of the bridge, and the steel truss is supported on the two tie beams by steel pipe supports;
A3. installing a temporary support at the position designed by the installation drawing and measuring the elevation to ensure that the top end of the steel truss is consistent with the elevation of the top surface of the temporary support;
A4. then, the sectional beams are transported to the site, beam pieces forming the sectional beams are pushed one by one along the steel truss according to numbers to be in place, in the process of pushing one by one, the correspondence of male pins and female pins is maintained between every two longitudinal beam pieces, and the transverse beam pieces are pushed to ensure that the distance of 5cm is kept between every two transverse beam pieces;
A5. when all the beam pieces of the equal-span segmental beam are pushed onto the steel truss, carrying out steel strand penetrating, and manually penetrating among the transverse beam pieces by adopting one end to pull and the other end;
A6. smearing high-strength proportioned cement paste with rubber between transverse beam sheets, then simultaneously primarily tensioning two ends of the segmental beam, and keeping the integral line shape of the segmental beam unchanged in the primary tensioning process;
A7. then formally tensioning, after the pre-camber meets the requirement, the beam piece at the middle section is in a state of being separated from the steel truss and the temporary support, the beam pieces at two ends of the segmental beam are temporarily supported by square timber or a steel backing plate at the position of the temporary support on the tie beam through a jack, and the steel truss is moved to the next span station;
A8. then, performing pipeline grouting, and when the strength meets the requirement, performing transverse and longitudinal jacking on the beam pieces of the section beam by adopting a jack, wherein the longitudinal jacking enables the beam pieces to be matched through male and female pins, and the transverse jacking of each beam piece is tightly combined through high-strength proportioned adhesive cement slurry; meanwhile, in the process of transverse jacking, attention needs to be paid to timely cleaning of overflow of the high-strength proportioning cementitious cement slurry at the joint of the beam and the slab;
A9. and after all the sections of beam pieces are jacked in place and the line shape of the integral section beam meets the requirement, jacking the two ends of the section beam by using a jack, replacing the permanent support on the tie beam, and then carrying out installation construction on the next span section beam.
2. The method of constructing an assembled precast segmental beam as claimed in claim 1, wherein the steel pin protrudes 5 to 9cm outside a beam piece of the side span or the middle span.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010981533.8A CN112095477A (en) | 2020-09-17 | 2020-09-17 | Construction method of prefabricated segmental beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010981533.8A CN112095477A (en) | 2020-09-17 | 2020-09-17 | Construction method of prefabricated segmental beam |
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| CN112095477A true CN112095477A (en) | 2020-12-18 |
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| CN202010981533.8A Pending CN112095477A (en) | 2020-09-17 | 2020-09-17 | Construction method of prefabricated segmental beam |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101684638A (en) * | 2008-09-23 | 2010-03-31 | 中交第三航务工程局有限公司 | Assembly method of section box girder |
| KR101547629B1 (en) * | 2014-08-11 | 2015-09-04 | 고은엽 | Steel girder with end diaphragm and semi-integral abutment bridge construction method therewith |
| CN105463997A (en) * | 2016-01-06 | 2016-04-06 | 上海同罡建筑工程有限公司 | Erecting method for segmental beam |
| CN108660902A (en) * | 2018-06-19 | 2018-10-16 | 中国铁路总公司 | A kind of Railway Prestressed Concrete continuous bridge of precast segment pin-connected panel |
| CN109487707A (en) * | 2018-12-28 | 2019-03-19 | 东南大学 | A kind of precast assembly expanded letter box beam and its assembling method |
| CN111188276A (en) * | 2020-01-17 | 2020-05-22 | 中铁电气化局集团有限公司 | Segmental beam sliding and assembling construction method |
-
2020
- 2020-09-17 CN CN202010981533.8A patent/CN112095477A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101684638A (en) * | 2008-09-23 | 2010-03-31 | 中交第三航务工程局有限公司 | Assembly method of section box girder |
| KR101547629B1 (en) * | 2014-08-11 | 2015-09-04 | 고은엽 | Steel girder with end diaphragm and semi-integral abutment bridge construction method therewith |
| CN105463997A (en) * | 2016-01-06 | 2016-04-06 | 上海同罡建筑工程有限公司 | Erecting method for segmental beam |
| CN108660902A (en) * | 2018-06-19 | 2018-10-16 | 中国铁路总公司 | A kind of Railway Prestressed Concrete continuous bridge of precast segment pin-connected panel |
| CN109487707A (en) * | 2018-12-28 | 2019-03-19 | 东南大学 | A kind of precast assembly expanded letter box beam and its assembling method |
| CN111188276A (en) * | 2020-01-17 | 2020-05-22 | 中铁电气化局集团有限公司 | Segmental beam sliding and assembling construction method |
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Application publication date: 20201218 |
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