CN112252190A - Prefabricating construction method for pi-shaped beam of ultra-high performance concrete pedestrian overpass - Google Patents
Prefabricating construction method for pi-shaped beam of ultra-high performance concrete pedestrian overpass Download PDFInfo
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- CN112252190A CN112252190A CN202011077404.2A CN202011077404A CN112252190A CN 112252190 A CN112252190 A CN 112252190A CN 202011077404 A CN202011077404 A CN 202011077404A CN 112252190 A CN112252190 A CN 112252190A
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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Abstract
The invention discloses a construction method for prefabricating a pi-shaped beam of an ultra-high performance concrete pedestrian overpass, which comprises the following steps: (a) the method comprises the steps of mounting a pedestal and a bottom die, (b) mounting a side die and a corrugated pipe, (c) mounting a vibration motor, (d) mounting an end die and an anchor backing plate, (e) mounting a transverse connecting steel plate, (f) pouring concrete, (g) spraying a curing agent and covering a moisturizing film for curing, (h) removing a die from a segmental beam, (i) curing by high-temperature steam, (j) splicing and tensioning segmental beams.
Description
Technical Field
The invention relates to a construction method for prefabricating a pi-shaped beam of an ultra-high performance concrete pedestrian overpass.
Background
Common concrete bridges and steel structure bridges are commonly adopted in modern urban pedestrian overpasses, the common concrete bridges are single in structure form, and the concrete surfaces are easy to weather and peel off and the structure is easy to crack; the steel structure type bridge is high in manufacturing cost and large in fatigue destruction, and in order to solve the problems, the pi-shaped beam of the ultra-high performance concrete pedestrian overpass is researched, and the pi-shaped beam is attractive in appearance, light in structure, convenient to construct and good in economical efficiency.
Disclosure of Invention
According to one aspect of the invention, the invention provides a construction method for prefabricating a pi-shaped beam of an ultra-high performance concrete pedestrian overpass, which comprises the following steps:
(a) installing a pedestal and a bottom die: installing a bottom die section steel support, installing a bottom die plate, removing scum at the joint of the bottom die and enabling the scum to be closely attached, and checking double-sided adhesive tape sealing strips on two sides of the bottom die to enable two sides of the bottom die to be smoothly in a straight line;
(b) installing a side die and a corrugated pipe: firstly, mounting one side die, then mounting a corrugated pipe positioning steel bar and a corrugated pipe, and finally mounting the other side die;
(c) installing a vibration motor: the vibration motor is provided with an upper row and a lower row which are arranged in an S-shaped staggered manner and arranged at the outer side of the side template;
(d) mounting the end die and the anchor backing plate after the side die and the corrugated pipe are mounted, and fixing the anchor backing plate and the end die by screws;
(e) installing transverse connection steel plates: arranging a transverse connecting steel plate on one side of the longitudinal connecting surface of the top plate of the segmental beam;
(f) pouring concrete: the stirred ultrahigh-performance concrete is delivered to a template by a hopper, pouring is started from the upper part of the template, a bottom plate and a web plate are poured firstly by adopting a longitudinal segmented and horizontal layered pouring mode, then a top plate is poured, the top plate is gradually poured from one end to the other end when being poured, and a vibrating motor is adopted for vibrating in the concrete pouring process;
(g) spraying a curing agent and covering a moisturizing film for curing: after the top surface is collected after a section of top plate is poured, spraying a curing agent, then paving a layer of moisturizing film on the surface of the concrete, and paving the moisturizing film and the surface of the concrete compactly without leaving air bubbles;
(h) and (3) removing the section beam: when the beam concrete reaches the condition that no scratch exists on the fingernails and no deformation occurs due to finger pressure, performing a test block pressure test, and removing the template after the concrete strength reaches the design strength;
(i) high-temperature steam curing: transferring the poured segmental beam to a steam-curing area for concentrated steam curing, wherein the steam-curing net sheet is separated from the top surface of the segmental beam by square timber supports, and the steam curing is completely sealed and covered by the segmental beam and the steam-curing net sheet; after the temperature is raised to a certain temperature, keeping the temperature for a period of time and then cooling;
(j) segment assembling and tensioning: coating interface glue on the splicing positions of the sectional beams uniformly, pushing the sectional beams at two ends to transversely butt joint positions by using a jack, pre-tensioning the prestress of a first T-shaped beam bottom plate to 30% of the design stress, and the prestress of a top plate to 20%, so that the interface glue at the interface connection position of each section overflows, the splicing of the sections is tight and seamless, and after the interface glue is dried, the prestress of the top plate is tensioned to 60% of the design stress, so that the whole T-shaped beam forms a simply supported structure; splicing the second T-shaped beam with the same tensile stress as the first T-shaped beam according to the same method; two ends of a second T-shaped beam are pushed by a jack to slowly move transversely at the same time, the pushing displacement is controlled constantly in the pushing process, the two ends are enabled to be horizontally pushed at the same speed, and the second T-shaped beam moves transversely to the opposite position, so that transverse connecting steel plates pre-embedded at the longitudinal connecting surface of the top surfaces of the two T-shaped beams are straight and tight; and then welding the transverse connecting steel plates pre-embedded in the top plate, synchronously tensioning the prestressed steel strands at the upper edge and the lower edge after all the transverse connecting steel plates are welded, and tensioning to the design stress to complete tensioning.
In some embodiments, in the step (b), the corrugated pipe is arranged twice, and comprises an upper edge corrugated pipe arranged in the middle of the top plate and a lower edge corrugated pipe arranged in the middle of the bottom plate, wherein the upper edge corrugated pipe adopts U-shaped steel bars as positioning steel bars of the upper edge corrugated pipe, and the U-shaped steel bars are arranged at a distance of 10 to 150 cm; the lower edge corrugated pipe adopts a well-shaped frame steel bar as a positioning steel bar, an upper steel bar and a lower steel bar with the length of 10-150cm are transversely adopted, the lower steel bar is designed at the height of a protective layer of the lower edge corrugated pipe, the upper steel bar presses the lower edge corrugated pipe and upwards presses the upper steel bar through a bottom plate chamfer, the steel bar which is communicated with a beam is longitudinally adopted, and the two steel bars with the length of 10-100cm are adopted at the left side and the right side of the vertical direction.
In some embodiments, in the step (b), the installation of guardrail embedded bars is further included, the guardrail embedded bars are arranged above the upper edge corrugated pipe at intervals, and the guardrail embedded bars are welded and fixed with U-shaped steel bars positioned on the upper edge corrugated pipe.
In some embodiments, in step (b), the side die mounting further comprises painting the release agent on the side die twice, first before the bellows is mounted and second after the bellows is mounted.
In some embodiments, in step (c), two adjacent vibrating motors in the upper and lower rows are spaced by 2m to 4m, and each vibrating motor is numbered with a corresponding switch.
In some embodiments, prior to step (e), further comprising a bail mounting: two lifting points are arranged on the center line of the web plate of each section of beam at a position 0.5-5 m away from the beam end, and each lifting point is provided with a lifting ring.
In some embodiments, in step (f), vibrating by using a vibrating motor is performed during the concrete pouring process, the vibrating motor corresponding to the pouring position is turned on, when the pouring of the whole-beam bottom plate is completed, all the lower rows of vibrating motors are turned on for vibrating for 10-20 seconds, when the pouring of the whole-beam web plate is completed, all the upper rows of vibrating motors are turned on for vibrating for 10-20 seconds, and after the pouring of the top plate is completed, the upper and lower rows of vibrating motors are turned on for vibrating for 20-30 seconds.
In some embodiments, in step (i), steaming is performed by using an industrial diesel boiler, the temperature rising speed is within 10 ℃/h, the temperature is kept for 48h after rising to 90 ℃, and then the temperature is reduced at the temperature reduction speed of 15 ℃/h.
The invention has the beneficial effects that: the invention gives full play to the ultrahigh strength and the ultrahigh toughness of the ultrahigh-performance concrete, and the structure is optimized, so that the whole bridge not only is very beautiful in appearance and meets the requirement of urban aesthetic design, but also is very light, does not need large hoisting equipment in the construction and hoisting process, occupies small road space, can be quickly constructed, and has little influence on urban traffic. The segment beam is prefabricated, other procedures of construction of the bridge are not affected, and the construction period can be greatly shortened. By utilizing the characteristic of ultra-long durability of the ultra-high performance concrete, the whole structure achieves the characteristic of later maintenance-free, and the later maintenance cost is greatly reduced.
Drawings
FIG. 1 is an elevation view of a pi-shaped beam of an ultra-high performance concrete pedestrian overpass according to one embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic view of a construction structure of a prefabricated model of a pi-shaped beam of an ultra-high performance concrete pedestrian overpass according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1-2 schematically show a pi-shaped beam of an ultra-high performance concrete pedestrian overpass according to an embodiment of the present invention, which comprises a top plate 1, a web 2, a bottom plate 3, a diaphragm plate 4, guardrail embedded steel bars 5, transverse connecting steel plates 6, and a guardrail 51; the T-shaped beam comprises a top plate 1, a web plate 2 and a bottom plate 3, wherein the two T-shaped beams form a Pi-shaped structure together, the ultra-wide and ultra-long of the precast beam of the pedestrian bridge in the transportation process are considered, the Pi-shaped beam adopts a section assembling mode in the prefabrication process, the Pi-shaped beam transversely consists of two symmetrical T-shaped beams, the Pi-shaped beam is longitudinally prefabricated according to different sections of the span, the two T-shaped beams are connected through a pre-embedded transverse connecting steel plate 6, and three transverse partition plates 4 are arranged between the two transverse T-shaped beams and are respectively arranged at the positions of the two ends of the span and the.
As shown in fig. 3, the ultra-high performance concrete pedestrian overpass pi-shaped beam prefabricating construction method comprises the following steps:
(a) mounting of the pedestal 100 and the bottom die 200: installing a bottom die section steel support, installing a bottom die plate, removing scum at the joint of the bottom die 200 and enabling the scum to be tightly attached, and checking double-sided adhesive tape sealing strips on two sides of the bottom die 200 to enable two sides of the bottom die 200 to be smoothly in a straight line.
(b) Side form 300 and bellows installation: firstly, installing a side die 300 on one side, then installing corrugated pipe positioning steel bars and corrugated pipes, and finally installing the side die 300 on the other side;
in the step (b), the diameter of the corrugated pipe positioning steel bar is 8-16 mm, the corrugated pipe is arranged twice, and the corrugated pipe positioning steel bar comprises an upper edge corrugated pipe 410 arranged in the middle of the top plate 1 and a lower edge corrugated pipe 420 arranged in the middle of the bottom plate 3, wherein the upper edge corrugated pipe 410 adopts U-shaped steel bars 411 as the positioning steel bars of the upper edge corrugated pipe 410, and the U-shaped steel bars 411 are arranged at a distance of 10-150 cm; the lower edge corrugated pipe 420 adopts a # -shaped frame 421 of reinforcing steel bars as positioning reinforcing steel bars, an upper reinforcing steel bar and a lower reinforcing steel bar with the length of 10-150cm are transversely adopted, the lower reinforcing steel bar is designed at the height of a protective layer of the lower edge corrugated pipe 420, the upper reinforcing steel bar presses the lower edge corrugated pipe 420 and upwards presses the upper reinforcing steel bar through a chamfer of the bottom plate 3, the reinforcing steel bar which is communicated with a beam is longitudinally adopted, and two reinforcing steel bars with the length of 10-100cm are adopted at the left side and the;
in the step (b), installing guardrail embedded steel bars 5, wherein the guardrail embedded steel bars 5 are arranged above the upper edge corrugated pipe 410 at intervals, and the guardrail embedded steel bars 5 are welded and fixed with U-shaped steel bars 411 positioned on the upper edge corrugated pipe 410;
in step (b), the installing of the side mold 300 further comprises painting a mold release agent on the side mold 300 twice, first before the corrugated pipe is installed and second after the corrugated pipe is installed.
(c) The vibration motor 500 is installed: the vibration motors 500 are arranged in an upper row and a lower row in an S-shaped staggered arrangement, the vibration motors 500 in the upper row are arranged at the opening position of the web 2, and the vibration motors 500 in the lower row are arranged at the position of the bottom plate 3;
in the step (c), two adjacent vibration motors 500 of the upper row and the lower row of vibration motors 500 are spaced by 2m-4m, and each vibration motor 500 and the corresponding switch compile a corresponding number.
(d) Mounting the end head die and the anchor backing plate 600, namely mounting the end head die and the anchor backing plate 600 after the side die 300 and the corrugated pipe are mounted, and fixing the anchor backing plate 600 and the end head die by screws; the anchor backing plate 600 and the end die are firmly reinforced by screws and cannot leak grout, the end die is installed after the installation of the side die 300 and the corrugated pipe is completed, the positioning ribs of the corrugated pipe must be installed when the end die and the side die 300 are reinforced to a set size, and the corrugated pipe needs to be kept in a linear shape to be qualified.
Before step (e), further comprising a hanging ring installation: two lifting points are arranged on the center line of the web 2 at the position 0.5m-5m away from the beam end of each section of beam, and each lifting point is provided with a lifting ring.
(e) Installing a transverse connecting steel plate 6: the transverse connecting steel plate 6 is arranged on one side of the longitudinal connecting surface of the segment beam top plate 1.
(f) Pouring concrete: the stirred ultrahigh-performance concrete is delivered to a template by a hopper, pouring is started from the upper part of the template, a bottom plate 3 and a web plate 2 are poured firstly by adopting a longitudinal segmented and horizontal layered pouring mode, then a top plate 1 is poured, the top plate 1 is gradually poured from one end to the other end when being poured, and a vibrating motor 500 is adopted for vibrating in the concrete pouring process; the vibration motors 500 corresponding to the pouring positions are opened, when the pouring of the full-beam bottom plate 3 is completed, all the lower rows of vibration motors 500 are opened for vibrating for 15 seconds, when the pouring of the full-beam web 2 is completed, all the upper rows of vibration motors 500 are opened for vibrating for 15 seconds, and after the pouring of the top plate 1 is completed, the upper and lower rows of vibration motors 500 are opened for vibrating for 20 seconds.
(g) Spraying a curing agent and covering a moisturizing film for curing: and after the top surface is collected after the top plate 1 is poured, spraying a curing agent, and then paving a layer of moisturizing film on the surface of the concrete, wherein the moisturizing film is closely adhered to the surface of the concrete without bubbles.
(h) And (3) removing the section beam: when the beam concrete reaches the condition that no scratch exists on the fingernails and no deformation occurs due to finger pressure, performing a test block pressure test, and removing the template after the concrete strength reaches the design strength;
in the step (h), the initial setting time of the concrete is 10-12 hours, the restraint is loosened (about 9 hours) after the surface of the beam body concrete is dried, a test block pressure test is carried out when the beam body concrete reaches the conditions that fingernails are not scratched and finger pressure is not deformed, and the template is removed (about 12 hours) after the concrete strength reaches the designed strength.
(i) High-temperature steam curing: transferring the poured segmental beam to a steam-curing area for concentrated steam curing, wherein the steam-curing net sheet is separated from the top surface of the segmental beam by square timber supports, and the steam curing is completely sealed and covered by the segmental beam and the steam-curing net sheet; after the temperature is raised to a certain temperature, keeping the temperature for a period of time and then cooling;
in the step (i), an industrial diesel oil boiler is adopted for steam curing, the temperature rising speed is within 10 ℃/h, the temperature is kept for 48h after rising to 90 ℃, and then the temperature is reduced at the temperature reduction speed of 15 ℃/h.
Before the step (j), a proper field is searched near a construction site in advance for splicing the segmental beams, the tensioning pedestal 100 and the field are arranged in advance, before the segmental is spliced, butter is coated on the upper portion of a tensioning base steel plate, the beams are convenient to move, a prestressed bellows sealing rubber gasket at the splicing position of the segmental beams is installed, prestressed steel strands of the top and bottom plates 3 are bundled, tensioning equipment such as a tensioning jack is installed, tensioning preparation work is well done, all joint surfaces are required to be clean before the segmental interface glue is coated, impurities such as oil stains and the like are removed, the surface of concrete is required to be as flat as possible, a loose surface layer and attached cement are required to be cleaned, and the surface is required to be dried or dried before gluing.
(j) Segment assembling and tensioning: coating interface glue on the splicing positions of the sectional beams uniformly, pushing the sectional beams at two ends to transversely butt joint positions by using a jack, pre-tensioning the prestress of a first T-shaped beam bottom plate 3 to 30% of the design stress, and pre-tensioning a top plate 1 to 20% of the design stress, so that the interface glue at the interface connection position of each section overflows, the sections are spliced tightly and seamlessly, and after the interface glue is dried, the prestress of the top and bottom plates 3 is tensioned to 60% of the design stress, so that the whole T-shaped beam forms a simply supported structure; splicing the second T-shaped beam with the same tensile stress as the first T-shaped beam according to the same method; two ends of a second T-shaped beam are pushed by a jack to slowly move transversely at the same time, the pushing displacement is controlled constantly in the pushing process, the two ends are enabled to be horizontally pushed at the same speed, and the second T-shaped beam moves transversely to the opposite position, so that the transverse connecting steel plates 6 pre-buried at the longitudinal connecting surface of the top surfaces of the two T-shaped beams are straight and tight; and then welding the transverse connecting steel plates 6 pre-embedded in the top plate 1, synchronously tensioning the prestressed steel strands at the upper edge and the lower edge after all the transverse connecting steel plates 6 are welded, and tensioning to the design stress to complete tensioning.
In the step (j), before the transverse connecting steel plate 6 is welded, three transverse partition plates 4 are welded between two transverse T-shaped beams to form a whole.
And (j) after the step (j), grouting, end sealing and guardrail pouring, wherein the grouting and end sealing construction method of the pi-shaped beam of the ultra-high performance concrete pedestrian bridge is the same as the grouting and end sealing construction method of the post-tensioning method of the common concrete precast beam in the prior art, the pouring of the guardrail adopts the ultra-high performance concrete, and the pouring mode is the same as the conventional concrete pouring, which is not described herein any more.
The ultra-high performance concrete (UHPC) is an ultra-high performance fiber reinforced cement-based composite material with high compressive strength, high tensile strength, high modulus, high ductility and high durability, and is prepared by cement, mineral admixture, quartz sand, quartz powder, steel fiber, water reducing agent and water according to the maximum compactness theory, so that the defects in the material are minimized. The pi-shaped beam of the ultra-high performance concrete pedestrian overpass is an urban pedestrian overpass with attractive appearance, light structure, convenient construction and good economy, and the prefabricated pi-shaped beam of the prefabricated construction method has high precision and can realize standardized production; the material consumption is small, and the hoisting weight is light; during site operation, all components are directly assembled without site pouring, and the construction speed is high.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (8)
1. The super-high performance concrete pedestrian overpass pi-shaped beam prefabricating construction method is characterized by comprising the following steps:
(a) installing a pedestal and a bottom die: installing a bottom die section steel support, installing a bottom die plate, removing scum at the joint of the bottom die and enabling the scum to be closely attached, and checking double-sided adhesive tape sealing strips on two sides of the bottom die to enable two sides of the bottom die to be smoothly in a straight line;
(b) installing a side die and a corrugated pipe: firstly, mounting one side die, then mounting a corrugated pipe positioning steel bar and a corrugated pipe, and finally mounting the other side die;
(c) installing a vibration motor: the vibration motor is provided with an upper row and a lower row which are arranged in an S-shaped staggered manner and arranged at the outer side of the side template;
(d) mounting the end die and the anchor backing plate after the side die and the corrugated pipe are mounted, and fixing the anchor backing plate and the end die by screws;
(e) installing transverse connection steel plates: arranging a transverse connecting steel plate on one side of the longitudinal connecting surface of the top plate of the segmental beam;
(f) pouring concrete: the stirred ultrahigh-performance concrete is delivered to a template by a hopper, pouring is started from the upper part of the template, a bottom plate and a web plate are poured firstly by adopting a longitudinal segmented and horizontal layered pouring mode, then a top plate is poured, the top plate is gradually poured from one end to the other end when being poured, and a vibrating motor is adopted for vibrating in the concrete pouring process;
(g) spraying a curing agent and covering a moisturizing film for curing: after the top surface is collected after a section of top plate is poured, spraying a curing agent, then paving a layer of moisturizing film on the surface of the concrete, and paving the moisturizing film and the surface of the concrete compactly without leaving air bubbles;
(h) and (3) removing the section beam: when the beam concrete reaches the condition that no scratch exists on the fingernails and no deformation occurs due to finger pressure, performing a test block pressure test, and removing the template after the concrete strength reaches the design strength;
(i) high-temperature steam curing: transferring the poured segmental beam to a steam-curing area for concentrated steam curing, wherein the steam-curing net sheet is separated from the top surface of the segmental beam by square timber supports, and the steam curing is completely sealed and covered by the segmental beam and the steam-curing net sheet; after the temperature is raised to a certain temperature, keeping the temperature for a period of time and then cooling;
(j) segment assembling and tensioning: coating interface glue on the splicing positions of the sectional beams uniformly, pushing the sectional beams at two ends to transversely butt joint positions by using a jack, pre-tensioning the prestress of a first T-shaped beam bottom plate to 30% of the design stress, and the prestress of a top plate to 20%, so that the interface glue at the interface connection position of each section overflows, the splicing of the sections is tight and seamless, and after the interface glue is dried, the prestress of the top plate is tensioned to 60% of the design stress, so that the whole T-shaped beam forms a simply supported structure; splicing the second T-shaped beam with the same tensile stress as the first T-shaped beam according to the same method; two ends of a second T-shaped beam are pushed by a jack to slowly move transversely at the same time, the pushing displacement is controlled constantly in the pushing process, the two ends are enabled to be horizontally pushed at the same speed, and the second T-shaped beam moves transversely to the opposite position, so that transverse connecting steel plates pre-embedded at the longitudinal connecting surface of the top surfaces of the two T-shaped beams are straight and tight; and then welding the transverse connecting steel plates pre-embedded in the top plate, synchronously tensioning the prestressed steel strands at the upper edge and the lower edge after all the transverse connecting steel plates are welded, and tensioning to the design stress to complete tensioning.
2. The prefabrication construction method according to claim 1, wherein in the step (b), the corrugated pipe is provided with two paths, including an upper edge corrugated pipe arranged in the middle of the top plate and a lower edge corrugated pipe arranged in the middle of the bottom plate, wherein the upper edge corrugated pipe adopts U-shaped steel bars as positioning steel bars of the upper edge corrugated pipe, and the U-shaped steel bars are arranged at a distance of 10-150 cm; the lower edge corrugated pipe adopts a well-shaped frame steel bar as a positioning steel bar, an upper steel bar and a lower steel bar with the length of 10-150cm are transversely adopted, the lower steel bar is designed at the height of a protective layer of the lower edge corrugated pipe, the upper steel bar presses the lower edge corrugated pipe and upwards presses the upper steel bar through a bottom plate chamfer, the steel bar which is communicated with a beam is longitudinally adopted, and the two steel bars with the length of 10-100cm are adopted at the left side and the right side of the vertical direction.
3. The prefabrication construction method according to claim 2, wherein in the step (b), the method further comprises the step of installing guardrail embedded steel bars, wherein the guardrail embedded steel bars are arranged above the upper edge corrugated pipe at intervals, and the guardrail embedded steel bars are welded and fixed with the U-shaped steel bars positioned on the upper edge corrugated pipe.
4. The prefabrication construction method according to claim 1, wherein in the step (b), the side die installation further comprises painting a release agent on the side die twice, wherein the painting is performed for the first time before the corrugated pipe is installed and for the second time after the corrugated pipe is installed.
5. The prefabrication construction method according to claim 1, wherein in the step (c), two adjacent vibration motors of the upper and lower rows of vibration motors are spaced by 1m-5m, and each vibration motor is provided with a corresponding number corresponding to a corresponding switch.
6. The prefabrication construction method according to claim 1, further comprising, before the step (e), installing a hanging ring: two lifting points are arranged on the center line of the web plate of each section of beam at a position 0.5-5 m away from the beam end, and each lifting point is provided with a lifting ring.
7. The prefabrication construction method according to claim 1, wherein in the step (f), the vibration motors are adopted for vibration during concrete pouring, the vibration motors corresponding to the pouring positions are opened, when the pouring of the bottom plate of the whole beam is completed, all the lower rows of vibration motors are opened for vibration for 10-20 seconds, when the pouring of the web plate of the whole beam is completed, all the upper rows of vibration motors are opened for vibration for 10-20 seconds, and after the pouring of the top plate is completed, the upper and lower rows of vibration motors are opened for vibration for 20-30 seconds.
8. The prefabrication construction method according to claim 1, wherein in step (i), an industrial diesel oil boiler is used for steam curing, the temperature rising speed is within 10 ℃/h, the temperature is kept for 48h after rising to 90 ℃, and then the temperature is reduced at the temperature reduction speed of 15 ℃/h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114633364A (en) * | 2021-12-09 | 2022-06-17 | 中铁十九局集团有限公司 | Prefabricated segment box girder concrete pouring device |
| CN117947689A (en) * | 2024-03-22 | 2024-04-30 | 福建省高速公路科技创新研究院有限公司 | UHPC bridge diaphragm plate shell membrane convenient to install and construction method |
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| CN105019350A (en) * | 2014-04-30 | 2015-11-04 | 郑州大学 | Prefabricated T-shaped beam and method of building continuous beam bridge by adopting prefabricated T-shaped beams |
| CN206693068U (en) * | 2017-05-04 | 2017-12-01 | 中铁第五勘察设计院集团有限公司 | A kind of T beam forms takes off mould shifting device |
| CN209686250U (en) * | 2019-01-29 | 2019-11-26 | 中铁十二局集团第一工程有限公司 | The cast-in-place flange plate rapid construction tooling of Simple T-Girders |
| CN111702948A (en) * | 2020-07-15 | 2020-09-25 | 安徽省路港工程有限责任公司 | Pouring system and pouring method for automatic prefabricated T beam |
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| CN114633364A (en) * | 2021-12-09 | 2022-06-17 | 中铁十九局集团有限公司 | Prefabricated segment box girder concrete pouring device |
| CN117947689A (en) * | 2024-03-22 | 2024-04-30 | 福建省高速公路科技创新研究院有限公司 | UHPC bridge diaphragm plate shell membrane convenient to install and construction method |
| CN117947689B (en) * | 2024-03-22 | 2024-05-28 | 福建省高速公路科技创新研究院有限公司 | UHPC bridge diaphragm plate shell membrane convenient to install and construction method |
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Application publication date: 20210122 |