CN112144418A - Rapid construction method of small and medium span assembled I-shaped beam bridge - Google Patents
Rapid construction method of small and medium span assembled I-shaped beam bridge Download PDFInfo
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- CN112144418A CN112144418A CN202011094867.XA CN202011094867A CN112144418A CN 112144418 A CN112144418 A CN 112144418A CN 202011094867 A CN202011094867 A CN 202011094867A CN 112144418 A CN112144418 A CN 112144418A
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- 238000010276 construction Methods 0.000 title claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 230000000149 penetrating Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 239000004568 cement Substances 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims abstract description 4
- 238000009417 prefabrication Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 12
- 230000002787 reinforcement Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 3
- 238000009415 formwork Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003014 reinforcing Effects 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
Classifications
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
Abstract
The invention discloses a rapid construction method of a middle and small span assembled I-shaped beam bridge, which comprises the following steps: prefabricating a beam I and a bridge deck on a rapid transfer platform, constructing a bridge substructure, hoisting and assembling the beam I and the bridge deck, welding reserved steel bar heads at the end parts of the adjacent bridge decks, penetrating longitudinal prestressed steel wire bundles into reserved holes of the bridge decks, tensioning the longitudinal prestressed steel wire bundles to a design required value, grouting, sealing, moving a bridge girder erection machine forwards, repeating the third step and the fourth step to erect the next bridge span, repeating the fifth step, completing erection of the rest bridges, pouring cement slurry into grouting grooves between the adjacent bridge decks, and pouring a bridge deck pavement layer to complete construction. The invention adopts the assembled prefabricated I-beam and the bridge deck which are produced in batch in factory, improves the quality and the speed of prefabricated assembly, can reduce the using amount of the bracket and the template during site construction, improves the construction efficiency, and reduces the influence of factors such as terrain on the construction.
Description
Technical Field
The invention relates to the technical field of construction of assembled bridges, in particular to a rapid construction method of a middle-small span assembled I-shaped beam bridge.
Background
The traditional construction process of the I-shaped girder bridge with the medium and small span (less than or equal to 30 m) is generally divided into two types, one type is that a large number of steel frame templates are supported in the gap of the I-shaped girder and the outer flange edges at two sides, steel bars are bound, concrete is poured in situ, and the templates are removed after the concrete reaches the designed strength; the other method is improved compared with the former method, firstly, connecting plates among a plurality of I-shaped beams are prefabricated, the connecting plates are hoisted to the gaps of the bridge deck I-shaped beams, the left side and the right side of the I-shaped beam connecting plates are made to fall on the I-shaped beams on the two sides, the effect of transverse connection is achieved by placing a plurality of I-shaped beam connecting plates, steel bar binding and concrete pouring can be carried out on the I-shaped beam connecting plates, and support templates still need to be erected at the wing edges of the I-shaped beams on the outermost.
The two methods both need to use a large number of templates in the construction process, so the method has the defect of low construction speed, and particularly for mountainous bridges, urban viaducts with higher traffic protection requirements and newly-built bridges without ground road beam transportation conditions, the templates are difficult to erect and inconvenient to dismantle due to terrain limitation, so the construction difficulty is increased, and the economic cost performance is low; secondly, the uncertain factor of cast-in-place structure in the work progress is more, and construction safety risk degree is higher.
Disclosure of Invention
In order to solve the problems, the invention provides a rapid construction method of a middle-small span assembly type I-shaped beam bridge, which can adopt the following technical scheme:
the invention relates to a rapid construction method of a middle and small span assembly type I-shaped beam bridge, which comprises the following steps:
firstly, prefabricating a beam I and a bridge deck on a rapid transfer platform; the top surface of the prefabricated I beam is provided with a shear key, the bottom surface of the bridge deck slab is provided with a shear groove matched with the shear key, the longitudinal two ends of each bridge deck slab are respectively provided with an occlusion structure matched with the adjacent bridge deck slab and a reserved steel bar head connected with the adjacent bridge deck slab, and each bridge deck slab is also internally provided with a transverse prestressed steel wire bundle and a longitudinal reserved hole channel;
secondly, constructing a bridge lower structure;
thirdly, hoisting the first span I beam in place through a bridge girder erection machine, then adjusting the position of the first span I beam, hoisting the rest I beams in the span in sequence, hoisting the bridge deck after the hoisting of the span I beam is finished, aligning the shear grooves of the bridge deck to the shear keys of the I beams, assembling the bridge deck and the bridge deck in place, and enabling the occlusion structures of the adjacent bridge decks to be matched with each other;
fourthly, welding reserved steel bar heads at the end parts of the adjacent bridge deck plates, penetrating longitudinal prestressed steel tows into reserved hole channels of the bridge deck plates, tensioning the longitudinal prestressed steel tows to a design required value, and then grouting and sealing the anchor;
fifthly, moving the bridge girder erection machine forward, and repeating the third step and the fourth step to erect the next bridge span;
sixthly, repeating the fifth step to finish the erection of the rest of the bridge;
and seventhly, pouring cement paste into the grouting grooves between the adjacent bridge deck plates, and then pouring the bridge deck pavement layer to finish construction.
The rapid transit platform comprises
Prefabricating a vehicle;
the prefabricating area track is matched with the prefabricating vehicle;
the transfer area track is positioned on one side of the prefabrication area track and is vertical to the prefabrication area track;
the conveying platform is arranged on the transfer area track in a sliding mode and is provided with a conveying track matched with the prefabricated vehicle, and the conveying track is perpendicular to the transfer area track;
the maintenance area rails are divided into a plurality of groups and arranged on the other side of the transfer area rails, and each group of maintenance area rails are perpendicular to the transfer area rails and are matched with the precast car;
the water spraying mechanism comprises nozzles which are divided into a plurality of rows and arranged between the grouped curing area rails;
and the hoisting mechanism comprises a gantry crane and a stock rail which is in sliding connection with the gantry crane, wherein the stock rail is arranged on two sides of the maintenance area rail and is parallel to the transfer area rail.
The prefabricated vehicle comprises a prefabricated bedplate with driving wheels, baffle plates are arranged at two ends of the prefabricated bedplate, end templates, side templates and split bolts are arranged on the inner sides of the baffle plates, and prestress tensioning equipment and clamps are arranged on the outer sides of the baffle plates.
The air content of the concrete mixture for prefabricating the bridge deck is 3.0-4.5% before the mixture is filled into a mold, and the mold filling temperature is 5-30 ℃.
The total pouring time of each bridge deck is not more than 6 hours.
And a prestressed steel beam is arranged in the I beam.
According to the rapid construction method of the middle and small span assembly type I-shaped beam bridge, the mode that the I beam and the bridge deck are prefabricated in advance is adopted, the industrial batch production can be realized, the prefabrication speed and the quality of the prefabricated block are improved, and the matching structure is arranged on the joint surface of the I beam and the bridge deck, so that the assembly quality and the bridge assembly speed can be improved; and thirdly, the I beam and the bridge deck are constructed in an assembly mode, so that the using amount of the supports and the templates can be reduced, the construction efficiency is improved, and the influence of factors such as terrain on construction is reduced.
Compared with the prior art, the invention has the following advantages:
1) compared with the traditional T-shaped beam and the small box beam with the same span, the small-span I-shaped beam is light in hoisting weight and low in requirement on hoisting equipment;
2) the I-shaped bridge is prestressed in two directions, and compared with a traditional reinforcing system, the I-shaped bridge is firm in stress performance;
3) the I-shaped bridge can be quickly produced, built or dismantled, a large number of templates are not needed in the bridge construction process, the construction is convenient and fast, the operation speed is high, and the bridge is particularly suitable for bridge erection in mountainous areas and other complex terrain conditions;
4) the I-shaped bridge has good applicability to ramps, particularly ramps with the radius less than 150m, and can save construction steps of foundation treatment, support erection and the like for cast-in-place box girders;
5) the I-shaped bridge belongs to a prestressed girder bridge, and compared with a non-prestressed girder bridge, the I-shaped bridge has smaller deflection of the girder bridge under service load;
6) compared with the same type of bridge, the I type of bridge has the advantages that the consumption of concrete and prestressed steel bundles is less, and the material cost is greatly saved;
7) the prefabricated I beam and the bridge deck are constructed by adopting a pre-tensioning method, compared with a post-tensioning method, the method has the advantages of simple process, reliable cohesive force self-anchoring of the pre-tensioning method, repeated use of the temporary anchorage device or the clamp, excellent economic performance during mass production and good quality stability;
8) the prefabricated I beam and the bridge deck are implemented on the rapid transfer platform, the prefabricated yard can be reasonably partitioned, the construction procedure is simplified, the prefabricated vehicle can be repeatedly utilized, the construction cost is reduced, and the beam manufacturing speed is increased.
Drawings
Fig. 1 is a schematic structural view of the bridge according to the present invention (other transverse bridge decks are omitted).
Fig. 2 is a schematic cross-sectional view of fig. 1.
Fig. 3 is a schematic structural diagram of the prefabricated vehicle of the invention.
Fig. 4 is a schematic structural diagram of the rapid transit platform according to the present invention.
Fig. 5 is a schematic structural view of an I-beam with prestressed steel strands according to the present invention.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the drawings, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the scope of the present invention is not limited to the following embodiments.
The rapid construction method of the middle-small span assembly type I-shaped girder bridge achieves the purpose of rapid construction by prefabricating I-shaped girders and bridge decks in batches and hoisting and assembling the prefabricated I-shaped girders and the bridge decks by a bridge girder erection machine on site.
As shown in fig. 1 and 2, a shear key 1.1 is arranged on the top surface of the precast I-beam 1, a shear groove 2.1 adapted to the shear key 1.1 is arranged on the bottom surface of the deck slab 2, an engagement structure (usually an engagement upper groove 2.2 and an engagement lower groove 2.3) adapted to the adjacent deck slab 2 and a reserved steel bar head connected to the adjacent deck slab 2 are respectively arranged at both longitudinal ends of each deck slab 2, and a transverse prestressed steel strand and a longitudinal reserved hole 2.4 are further arranged in each deck slab 2.
When the I beam 1 and the bridge deck 2 are prefabricated, the prefabricated vehicle is used on the rapid transfer platform to be implemented, and the prefabricated vehicle and the rapid transfer platform are matched, so that the utilization rate of equipment can be improved, the transfer efficiency of prefabricated members can be improved, and the occupied area of prefabricated members in a field can be reduced.
As shown in fig. 3, the prefabricating vehicle comprises a prefabricating bedplate C2 with a driving wheel C1, two ends of the prefabricating bedplate C2 are respectively provided with a baffle C3, an end formwork C4, a side formwork C5 and a counter-pulling bolt C6 for fixing the formworks are arranged on the inner side of the baffle C3, and a prestress tensioning device C7 and a clamp C8 matched with the prestress tensioning device for fixing prestress steel tows are arranged on the outer side of the baffle C3.
As shown in fig. 4, the rapid transit platform comprises a track T1 of a prefabrication area, a track T2 of a transfer area and a track T3 of a maintenance area, which are arranged in sequence from left to right, wherein the track T1 of the prefabrication area is matched with a prefabrication vehicle and is vertically arranged on one side of the track T2 of the transfer area; a transfer area rail T2 on which a transfer table having a pair of transfer rails T4 fitted to the pre-cast cars is slidably mounted, the transfer rails T4 being perpendicular to the transfer area rail T2 and parallel to the pre-cast area rail T1; the maintenance area rails T3 are a plurality of groups, are arranged in a row and are distributed on the other side of the transfer area rail T2, and each group of maintenance area rails T3 is matched with the prefabricated vehicle, is vertical to the transfer area rail T2 and is parallel to the conveying rail T4; for concrete curing, a water spray mechanism is installed in the area of the curing zone track T3, and nozzles T5 of the water spray mechanism are arranged in a row and installed between adjacent curing zone tracks T3. In order to transfer the maintained prefabricated members to the storage area, stock rails T6 are arranged on two sides of the maintenance area rail T3, the stock rails T6 are parallel to the transfer area rail T2, and a gantry crane T7 is connected to the stock rails in a sliding mode to form a hoisting mechanism.
When prefabrication is carried out, a prefabrication vehicle is firstly placed on the prefabrication area rail T1, and formwork erection and concrete pouring are carried out. Specifically, the end formworks C4 and the side formworks C5 are fixed by tightening the split bolts C6, the banded reinforcement cage is placed in the formworks, and then, cushion blocks with the consistent strength are placed at the positions where the reinforcements are in contact with the formworks and used for fixing the position of the reinforcement cage in the formworks. After the preparation work is finished, if the prestressed steel tows do not need to be penetrated, concrete pouring can be carried out; for the prefabricated member with the requirement of setting the prestressed steel tows, the prestressed steel tows are arranged at the corresponding positions of the steel reinforcement cage in a penetrating mode and fixed through a clamp C8, then the prestressed tensioning equipment C7 is started to stretch the prestressed steel to the design value, then concrete is poured, and the vibrating rods are used for uniformly inserting and tamping. The air content of the concrete mixture used for prefabricating the bridge deck is 3.0-4.5% before entering the die, and the temperature of entering the die is 5-30 ℃; and the total pouring time of each bridge deck is not more than 6 hours. After pouring is completed, the conveying track T4 is aligned to the track T1 of the prefabricating area, the prefabricating vehicle enters the conveying table, then the conveying table moves along the transfer area track T2 until the conveying track T4 is aligned to the track T3 of the target maintenance area according to actual production conditions, the prefabricating vehicle is transferred to the conveying table, and the nozzles T5 on the two sides are opened for spraying maintenance. When the maintenance is finished and the design target is reached, the template is removed, and the original road of the prefabricating vehicle returns to the prefabricating area track T1; meanwhile, the prefabricated member is transferred to a storage area at the other end of the track T3 of the maintenance area for standby through a gantry crane T7.
The number of the precast car, the number of the maintenance area rails T3 and the number of the nozzles T5 are determined by actual conditions, normal circulating operation needs to be guaranteed, and the precast car, the conveying platform and the gantry crane T7 are all provided with electric control driving equipment.
In addition, during the prefabrication process, longitudinal prestressed steel beams 1.2 (see fig. 5) can be arranged in the I-shaped beam 1, and the construction can be facilitated without turning corners.
The invention relates to a rapid construction method of a middle and small span assembly type I-shaped beam bridge, which comprises the following steps:
firstly, prefabricating an I beam 1 and a bridge deck 2 on a rapid transfer platform;
secondly, constructing a bridge lower structure comprising a pile foundation and a pier; specifically, after drilling is completed, the pile foundation reinforcement cage bound in the reinforcement processing factory is lowered to a design position, and concrete is poured to complete construction of the pile foundation;
thirdly, hoisting the first span I beam 1 in place through a bridge girder erection machine, hoisting the bridge deck 2, aligning the shear groove 2.1 of the bridge deck 2 with the shear key 1.1 of the I beam 1, and assembling the first span I beam and the bridge deck in place; specifically, a bridge girder erection machine is erected, supporting legs of the bridge girder erection machine are temporarily anchored at the pier tops of piers, a first precast beam section is hoisted to a designed position at a fixed point through the bridge girder erection machine, the axis of the first precast beam section is adjusted and is used as a reference surface for assembling a whole span section after being temporarily fixed, a first span whole precast beam section is assembled by adjusting the position of the bridge girder erection machine on a transverse moving track, then a bridge deck 2 is hoisted to the upper part of an I-shaped beam 1 by a crane, after the position is adjusted, a next bridge deck 2 is hoisted and is placed next to the previous bridge deck 2, the first bridge deck 2 is adjusted to be in a position where the previous bridge deck 2 is parallel, an occlusion lower groove 2.3 of a second deck is connected with an occlusion upper groove 2.2.2 of a first deck, meanwhile, a shear groove 2.1 of the bridge deck 2 is assembled in a shear key 1.1 of the I-shaped beam 1, no sliding between each part is ensured, and;
fourthly, welding reserved steel bar heads at the end parts of the adjacent bridge deck plates 2, penetrating longitudinal prestressed steel tows into reserved hole channels 2.4 of the bridge deck plates 2, tensioning the longitudinal prestressed steel tows to a design required value, and grouting and anchoring; when longitudinal prestressed steel tows are tensioned, the position of a tensioning machine is corrected, and a pore channel is cleaned; then, the prestressed steel wire bundle is penetrated, and an anchorage device and a clamping piece are installed; symmetrically tensioning the prestressed steel wire bundles in batches in stages, comparing the elongation value with a theoretical value, anchoring after the elongation value is qualified, and cutting redundant steel strands; the pore canal grouting adopts a vacuum grouting process, and the continuous operation is carried out according to the sequence from bottom to top until the consistency of the slurry at the outlet is the same as that at the inlet; after the pore canal grouting is finished, the anchorage device can be subjected to anchorage sealing treatment, and the strength grade of anchorage sealing concrete is generally not lower than that of section beam concrete;
fifthly, moving the bridge girder erection machine forward, and repeating the third step and the fourth step to erect the next bridge span; specifically, beam pieces are fed in place through a beam conveying trolley, a front hoisting overhead crane hanging beam moves forwards to a rear hoisting overhead crane hanging beam point, a rear hoisting overhead crane hanging beam moves forwards to a frame beam position, a rear supporting leg is retracted, a front supporting leg and a middle support traveling mechanism drive the whole machine to transversely move to the next frame beam machine position, the rear supporting leg extends out, the rest beam positions are erected, full-width erection is completed, and preparation is made for whole machine via holes;
sixthly, repeating the fifth step to finish the erection of the rest of the bridge;
and seventhly, after the bridge deck plates 2 are paved, pouring cement paste into the grouting grooves 2.5 between the adjacent bridge deck plates 2, removing sundries on the upper parts of the bridge deck plates 2 after the strength reaches a design value, pouring a bridge deck pavement layer, and installing bridge deck guardrails and other auxiliary facilities to complete construction.
In the construction of the small and medium span fabricated beam bridge, the I-shaped beam bridge can save a large amount of concrete and reinforcing steel bars. The invention is compared with small box girders and T-beams with the same bridge width, bridge length and bridge floor area, as shown in tables 1 and 2.
TABLE 1 engineering quantity comparison
TABLE 2 economic comparison
As can be seen from Table 1, in the three types of the small box girder, the T girder and the I girder pre-tensioning bridge, under the conditions that the length of the bridge is the same, the area of the bridge floor is the same, the quality, the stress and the like all meet the engineering requirements, the consumption of concrete and reinforcing steel bars of the pre-tensioning I girder bridge is the least, and the consumption of the used prestressed reinforcing steel bars is approximately half of that of the similar bridge. Meanwhile, as can be seen from table 2, the pretensioned I-beam bridges are also more economical in terms of construction costs than comparable box beams and T-beams.
The prefabrication process of the assembly type pretensioned I beam is simple and easy to implement. In the early-stage prefabrication process of the I beam and the bridge deck, a prefabricating vehicle is adopted to carry out industrial-field batch implementation on a rapid transfer platform, so that the beam manufacturing efficiency is greatly improved, and the bridge quality is ensured; in the later-stage field assembly process, the construction process of the assembly type I beam is optimized, the construction speed is increased, the construction difficulty is reduced, and the construction period is saved.
It should be noted that in the description of the present invention, terms of orientation or positional relationship such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Claims (6)
1. A quick construction method of a middle and small span assembly type I-shaped beam bridge is characterized by comprising the following steps: the method comprises the following steps:
firstly, prefabricating a beam I and a bridge deck on a rapid transfer platform; the top surface of the prefabricated I beam is provided with a shear key, the bottom surface of the bridge deck slab is provided with a shear groove matched with the shear key, the longitudinal two ends of each bridge deck slab are respectively provided with an occlusion structure matched with the adjacent bridge deck slab and a reserved steel bar head connected with the adjacent bridge deck slab, and each bridge deck slab is also internally provided with a transverse prestressed steel wire bundle and a longitudinal reserved hole channel;
secondly, constructing a bridge lower structure;
thirdly, hoisting the first span I beam in place through a bridge girder erection machine, then adjusting the position of the first span I beam, hoisting the rest I beams in the span in sequence, hoisting the bridge deck after the hoisting of the span I beam is finished, aligning the shear grooves of the bridge deck to the shear keys of the I beams, assembling the bridge deck and the bridge deck in place, and enabling the occlusion structures of the adjacent bridge decks to be matched with each other;
fourthly, welding reserved steel bar heads at the end parts of the adjacent bridge deck plates, penetrating longitudinal prestressed steel tows into reserved hole channels of the bridge deck plates, tensioning the longitudinal prestressed steel tows to a design required value, and then grouting and sealing the anchor;
fifthly, moving the bridge girder erection machine forward, and repeating the third step and the fourth step to erect the next bridge span;
sixthly, repeating the fifth step to finish the erection of the rest of the bridge;
and seventhly, pouring cement paste into the grouting grooves between the adjacent bridge deck plates, and then pouring the bridge deck pavement layer to finish construction.
2. The rapid construction method of the middle and small span fabricated I-shaped beam bridge according to claim 1, characterized in that: the rapid transit platform comprises
Prefabricating a vehicle;
the prefabricating area track is matched with the prefabricating vehicle;
the transfer area track is positioned on one side of the prefabrication area track and is vertical to the prefabrication area track;
the conveying platform is arranged on the transfer area track in a sliding mode and is provided with a conveying track matched with the prefabricated vehicle, and the conveying track is perpendicular to the transfer area track;
the maintenance area rails are divided into a plurality of groups and arranged on the other side of the transfer area rails, and each group of maintenance area rails are perpendicular to the transfer area rails and are matched with the precast car;
the water spraying mechanism comprises nozzles which are divided into a plurality of rows and arranged between the grouped curing area rails;
and the hoisting mechanism comprises a gantry crane and a stock rail which is in sliding connection with the gantry crane, wherein the stock rail is arranged on two sides of the maintenance area rail and is parallel to the transfer area rail.
3. The rapid construction method of the middle and small span fabricated I-shaped beam bridge according to claim 2, characterized in that: the prefabricated vehicle comprises a prefabricated bedplate with driving wheels, baffle plates are arranged at two ends of the prefabricated bedplate, end templates, side templates and split bolts are arranged on the inner sides of the baffle plates, and prestress tensioning equipment and clamps are arranged on the outer sides of the baffle plates.
4. The rapid construction method of the middle and small span fabricated I-shaped girder bridge according to claim 3, characterized in that: the air content of the concrete mixture for prefabricating the bridge deck is 3.0-4.5% before the mixture is filled into a mold, and the mold filling temperature is 5-30 ℃.
5. The rapid construction method of the middle and small span fabricated I-shaped girder bridge according to claim 3, characterized in that: the total pouring time of each bridge deck is not more than 6 hours.
6. The rapid construction method of the middle and small span fabricated I-shaped beam bridge according to claim 1, characterized in that: and a prestressed steel beam is arranged in the I beam.
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| CN202011094867.XA CN112144418A (en) | 2020-10-14 | 2020-10-14 | Rapid construction method of small and medium span assembled I-shaped beam bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112681108A (en) * | 2020-12-31 | 2021-04-20 | 徐智勇 | Assembled bridge |
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