CN211285212U - Small box girder structure suitable for medium and small span simply supported girder bridge - Google Patents
Small box girder structure suitable for medium and small span simply supported girder bridge Download PDFInfo
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- CN211285212U CN211285212U CN201921471605.3U CN201921471605U CN211285212U CN 211285212 U CN211285212 U CN 211285212U CN 201921471605 U CN201921471605 U CN 201921471605U CN 211285212 U CN211285212 U CN 211285212U
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Abstract
The utility model discloses a little case girder construction suitable for well little span simply supported girder bridge, include: the prestressed concrete box girder is characterized in that a prestressed steel beam is pre-embedded in a bottom plate of the prestressed concrete box girder, the top of the prestressed concrete box girder is opened to form an opening, flange plates extend to two sides of the top of the prestressed concrete box girder at the opening, and a notch is reserved at the opening at the top of the prestressed concrete box girder; the prefabricated reinforced concrete slab can be erected at the opening of the small prestressed concrete box girder through the notch, and the prefabricated reinforced concrete slab and the small prestressed concrete box girder are assembled in place to form the reinforced concrete bridge deck construction bottom formwork. The utility model discloses erect the back and directly form decking construction die block, need not to set up support and die block, saved the operating expenses, the wholeness is strong, has reduced the cast-in-place wet seam in later stage and has appeared possibility and the maintenance cost of disease.
Description
Technical Field
The utility model relates to a bridge engineering field. More specifically, the utility model relates to a small box girder structure suitable for middle and small span (span is less than or equal to 40m) simply supported girder bridge.
Background
The middle and small span girder bridge in China mostly adopts an assembled structure, and is a concrete structure formed by assembling and connecting prefabricated components serving as main stress components. The assembled structure is one of the important directions for the development of the building structure in China, is beneficial to the development of the industrialization of the building in China, improves the production efficiency, saves energy, develops green and environment-friendly buildings, and is beneficial to improving and ensuring the quality of the building engineering.
In the existing highway and municipal medium and small span girder bridges, the structural form of a prestressed concrete T girder or a prestressed concrete box girder is generally adopted. As shown in fig. 1, the prestressed concrete T-beam has low structural rigidity, the problem of side bending of the precast beam is easily caused during construction, a wet joint and a diaphragm plate need to be cast in situ during construction, a template needs to be erected in the air, and the construction risk is high; because the T-beam structure is low in rigidity and mainly depends on the transverse partition plate to transmit load transversely, the transverse partition plate has more cracks in the use process, as shown in figure 2, the prestressed concrete box girder has heavier dead weight and is unfavorable for the transportation and hoisting construction of mountainous areas with complex terrain, the transverse partition plate and a wet joint are cast in place, and a bottom die is required to be erected on the construction site; when the small box girder is prefabricated, the problems of difficult internal mold taking out, difficult concrete vibration and the like exist, and the construction quality is difficult to ensure. And the reliability of the span inner position of the main beam of the box girder except the pivot is low, even the situation of ductility failure occurs, so that the maintenance frequency of the box girder in the use process is increased, the maintenance feasibility of the box girder is poor, the maintenance and reinforcement cost of the box girder is indirectly increased, and the use economy of the box girder is reduced.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to solve at least the above problems and to provide at least the advantages which will be described later.
The utility model also aims at providing a little case girder construction suitable for well little span simply supported girder bridge, it directly forms the decking construction die block after erectting, need not to set up support and die block, has saved the operating expenses, and the wholeness is strong, has reduced the cast-in-place wet seam in later stage and has appeared possibility and the maintenance cost of disease.
In order to achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a small box girder structure suitable for a middle and small span simply supported girder bridge, comprising:
the prestressed concrete box girder comprises a prestressed concrete box girder, wherein a prestressed steel beam is pre-embedded in a bottom plate of the prestressed concrete box girder, the top of the prestressed concrete box girder is opened to form an opening, flange plates extend to two sides from the opening at the top of the prestressed concrete box girder, a notch is reserved at the opening at the top of the prestressed concrete box girder, and the beam top width of the prestressed concrete box girder is more than the beam bottom width plus the beam height/5;
the prefabricated reinforced concrete slab can be erected at the opening of the small prestressed concrete box girder through the notch, and the prefabricated reinforced concrete slab and the small prestressed concrete box girder are assembled in place to form the reinforced concrete bridge deck construction bottom formwork.
Preferably, the thickness of the web plate of the prestressed concrete box girder is less than or equal to 0.12 m.
Preferably, the method comprises the following steps: the joints of the flange plates of the two adjacent small prestressed concrete box girders are controlled within 1 cm.
Preferably, the method comprises the following steps: and the pair of end clapboards are poured at the two ends of the plurality of prestressed concrete box girders in the longitudinal bridge direction.
Preferably, the method comprises the following steps: and the joint filling materials are filled in the joints of the flange plates of the two adjacent prestressed concrete box girders.
Preferably, when the length of the prestressed concrete box girder is less than or equal to 30m, the width of the bottom of the prestressed concrete box girder is 0.75m, the height of the prestressed concrete box girder is 1.3-2.1m, the thickness of the web plate is 0.11m, and the thickness of the bottom plate is 0.225 m; when the length of the prestressed concrete box girder is more than 30m and less than or equal to 40m, the width of the bottom of the prestressed concrete box girder is 0.8m, the height of the prestressed concrete box girder is 1.3-2.1m, the thickness of the web plate is 0.12m, and the thickness of the bottom plate is 0.275 m.
Preferably, the length of the prefabricated reinforced concrete slab is equal to the beam length/20 of the prestressed concrete box girder.
The utility model discloses at least, include following beneficial effect:
firstly, the prestressed concrete small box girder of the utility model is not provided with a top plate when being prefabricated, a notch is reserved at the opening part of the girder top, so that the inner mould is convenient to take out, the prefabrication is more convenient, all prestressed steel bundles are positioned at the bottom plate, the web plate is thinner, the dead weight is light, the material consumption of concrete, steel bars and the like is saved, the transportation and the hoisting can be more efficiently carried out in areas such as mountainous areas with limited transportation and hoisting, the hoisting cost and the engineering quantity of lower structures are saved;
second, the utility model discloses a prestressed concrete small box roof beam, prefabricated reinforced concrete board take the batch production prefabrication, the job site directly erects, only pour the end baffle after the hoisting of prestressed concrete small box roof beam, do not establish cast-in-place median septum and wet seam, very big reduction the time limit for a project, the flange board of prestressed concrete small box roof beam behind the frame roof beam, prefabricated reinforced concrete board directly form decking construction die block, need not to set up support and die block, the construction cost is low, the safety risk is little, can save the time limit for a project simultaneously by a wide margin.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural view of a wet joint and a diaphragm of a conventional prestressed concrete T-beam structure;
FIG. 2 is a schematic structural view of a wet joint and a diaphragm of a conventional prestressed concrete box girder;
fig. 3 is a side view of an embodiment of the present invention;
FIG. 4 is a cross-sectional view of an embodiment of the present invention;
FIG. 5 is a schematic view of step 4) of the construction method;
FIG. 6 is a schematic view of step 5) of the construction method;
fig. 7 is a schematic view of step 7) of the construction method.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected" and "disposed" are to be construed broadly, and may for example be fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Fig. 1, 2 show traditional prestressed concrete T roof beam structure, prestressed concrete little case roof beam 1 in the schematic diagram of cast-in-place wet seam 8 and cross slab 9 of work progress, have that cross slab 9 and wet seam 8 need cast-in-place and cross slab 9 crack diseases are more, dead weight and transportation difficulty scheduling problem, as shown in fig. 3-4, the utility model provides a little case girder structure suitable for well small span (span is less than or equal to 40m) simply supported girder bridge, include:
the prestressed concrete box girder comprises a prestressed concrete box girder 1, a bottom plate of the prestressed concrete box girder 1 is pre-buried with prestressed steel bundles, the top of the prestressed concrete box girder is open to form an opening, flange plates extend towards two sides of the opening at the top of the prestressed concrete box girder 1, a notch is reserved at the opening at the top of the prestressed concrete box girder 1, the height of the notch is lower than the top surface of the flange plates, and the width of the top of the prestressed concrete box girder 1 is more than the width of the bottom of the girder and the height of the girder/5;
the prefabricated reinforced concrete slab 2 is prefabricated in a prefabricated field, can be erected at an opening of the small prestressed concrete box girder 1 through the notch, and is assembled with the small prestressed concrete box girder 1 in place to form a construction bottom formwork of the reinforced concrete bridge deck 4.
In the technical scheme, the prefabricated reinforced concrete box girder mainly comprises a prestressed concrete box girder 1 and a prefabricated reinforced concrete slab 2. The prestressed concrete small box girder 1 cancels a top plate of a traditional small box girder, an inner mold can be conveniently taken out during prefabrication, the prefabrication is more convenient, the precision is higher, and the factory prefabrication can be realized. After the prestressed concrete box girder 1 is erected, the prefabricated reinforced concrete slab 2 is a reinforced concrete prefabricated slab, the factory prefabrication is also adopted, the construction site is directly erected, the construction period is greatly shortened, the bridge deck 4 construction bottom die is directly formed after the erection, a support and the bottom die do not need to be erected, the construction cost is saved, the integrity is high, and the possibility of diseases of the cast-in-place wet joint 8 in the later period and the maintenance cost are reduced.
In another technical scheme, the thickness of the web plate of the small prestressed concrete box girder 1 is less than or equal to 0.12 m. Because all the prestressed steel bundles are positioned at the bottom plate, the web plate is thin, the thickness is only less than or equal to 0.12m, the dead weight is light, the material consumption of concrete, steel bars and the like is saved, the transportation and the hoisting can be more efficiently carried out in mountainous areas and the like with limited transportation and hoisting, and the hoisting and transportation cost and the engineering quantity of the lower part structure 3 are saved.
In another aspect, the method comprises: the joints of the flange plates of a plurality of small prestressed concrete box girders 1 and prefabricated reinforced concrete plates 2 and two adjacent small prestressed concrete box girders 1 are controlled within 1 cm. The concrete the inside contains coarse aggregate, for example little stone, and the seam is controlled within 1cm, can not permeate down from last basically, and the concatenation of a plurality of prestressed concrete box girder 1 only needs the decking 4 of the different width of pouring, alright adjustment bridge floor width avoids traditional width that sets up wet seam 8 adjustment bridge floor to avoid the loaded down with trivial details, crack disease scheduling problem of construction.
In another aspect, the method comprises: and the pair of end clapboards are poured at the two ends of the plurality of prestressed concrete box girders 1 in the longitudinal bridge direction. After the beam is erected, concrete is poured at the part of the beam end to connect a plurality of small prestressed concrete box beams 1, construction is carried out above the pier, and the construction is convenient and fast.
In another aspect, the method comprises: and the joint filling materials are filled in the joints of the flange plates of the two adjacent prestressed concrete box girders 1. And the infiltration is avoided.
In another technical scheme, when the length of the prestressed concrete box girder 1 is less than or equal to 30m, the width of the bottom of the prestressed concrete box girder is 0.75m, the height of the prestressed concrete box girder is 1.3-2.1m, the thickness of the web plate is 0.11m, and the thickness of the bottom plate is 0.225 m; when the length of the prestressed concrete box girder 1 is more than 30m and less than or equal to 40m, the width of the bottom of the girder is 0.8m, the height of the girder is 1.3-2.1m, the thickness of the web plate is 0.12m, and the thickness of the bottom plate is 0.275 m. The gauge size is data obtained from actual production experience with excellent mechanical strength properties.
In another technical solution, the length of the prefabricated reinforced concrete slab 2 is equal to the beam length/20 of the prestressed concrete box girder 1. The top opening of the small prestressed concrete box girder 1 does not need to be completely covered, and the self weight is reduced on the premise of ensuring safe pouring of the bridge deck 4 as far as possible.
As shown in fig. 5 to 7, the construction method includes:
step 1) prefabricating the small prestressed concrete box girder 1 in a prefabricating field, embedding a lifting hook 5 during manufacturing, and storing the girder after the concrete strength meets the requirement;
step 2) prefabricating the prefabricated reinforced concrete slab 2 in a prefabrication field;
step 3), after the lower part structure 3 meets the strength requirement, erecting a bridge girder erection machine 6;
step 4), constructing the base stones and the cover beams together, positioning by using the base stones, transporting the small prestressed concrete box beams 1 to a construction site by using a beam transporting vehicle, hoisting lifting hooks 5 by using a bridge erecting machine 6 to erect the small prestressed concrete box beams 1, erecting the small prestressed concrete box beams 1, dropping the beams, and placing supports on the base stones to enable the beams to meet the requirements of design drawings;
step 5), mounting the prefabricated reinforced concrete slab 2, and assembling the prefabricated reinforced concrete slab and the small prestressed concrete box girder 1 in place to form a construction bottom die of the concrete bridge deck 4 without additionally erecting a support and the bottom die;
step 6), pouring end clapboards to be packaged at the two ends of the small prestressed concrete box girders 1 in the longitudinal bridge direction;
and 7) filling joint filling materials into the joints of the flange plates of the two adjacent small prestressed concrete box girders 1 to stop permeation, pouring the reinforced concrete bridge deck 4 to cover the height of the lifting hooks 5, and paving the bridge deck and constructing the railings and auxiliary facilities after the strength requirement is met.
The prestressed concrete small box girder 1 and the prefabricated reinforced concrete slab 2 are prefabricated in a factory, the construction site is directly erected, only end partition plates are poured after the prestressed concrete small box girder 1 is hoisted, cast-in-place middle partition plates and wet joints 8 are not arranged, the construction period is greatly shortened, the flange plates of the prestressed concrete small box girder 1 and the prefabricated reinforced concrete slab 2 after the prestressed concrete small box girder is erected directly form a bridge deck 4 construction bottom die, a support and the bottom die do not need to be erected, the construction cost is low, the safety risk is low, and the construction period can be greatly saved.
As shown in fig. 5, in order to adapt to different bridge deck widths, when a plurality of small prestressed concrete box girders 1 are hoisted and erected by using a bridge girder erection machine 6, the small prestressed concrete box girders are sequentially erected in the sequence from the middle to the two sides (the sequence of A, B, C, D, E), the joint of the flange plates of two adjacent small prestressed concrete box girders 1 is controlled within 1cm, and after the small prestressed concrete box girders 1 are completely erected, the prefabricated reinforced concrete plates 2 are installed.
The number of apparatuses and the scale of the process described here are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (7)
1. Be applicable to little box girder construction of short beam bridge of well small span, its characterized in that includes:
the prestressed concrete box girder comprises a prestressed concrete box girder, wherein a prestressed steel beam is pre-embedded in a bottom plate of the prestressed concrete box girder, the top of the prestressed concrete box girder is opened to form an opening, flange plates extend to two sides from the opening at the top of the prestressed concrete box girder, a notch is reserved at the opening at the top of the prestressed concrete box girder, and the beam top width of the prestressed concrete box girder is more than the beam bottom width plus the beam height/5;
the prefabricated reinforced concrete slab can be erected at the opening of the small prestressed concrete box girder through the notch, and the prefabricated reinforced concrete slab and the small prestressed concrete box girder are assembled in place to form the reinforced concrete bridge deck construction bottom formwork.
2. The small box girder structure suitable for the middle and small span simply supported girder bridge according to claim 1, wherein the web thickness of the prestressed concrete small box girder is less than or equal to 0.12 m.
3. A trabecular structure suitable for use in a simple girder bridge having a medium-small span according to claim 1, comprising: the joints of the flange plates of the two adjacent small prestressed concrete box girders are controlled within 1 cm.
4. A small box girder structure suitable for a simple girder bridge having a medium and small span according to claim 3, comprising: and the pair of end clapboards are poured at the two ends of the plurality of prestressed concrete box girders in the longitudinal bridge direction.
5. A small box girder structure suitable for a simple girder bridge having a medium and small span according to claim 3, comprising: and the joint filling materials are filled in the joints of the flange plates of the two adjacent prestressed concrete box girders.
6. The small box girder structure suitable for the middle and small span simply supported girder bridge according to claim 1, wherein when the prestressed concrete small box girder has a girder length of 30m or less, a girder bottom width of 0.75m, a girder height of 1.3-2.1m, a web thickness of 0.11m, and a bottom plate thickness of 0.225 m; when the length of the prestressed concrete box girder is more than 30m and less than or equal to 40m, the width of the bottom of the prestressed concrete box girder is 0.8m, the height of the prestressed concrete box girder is 1.3-2.1m, the thickness of the web plate is 0.12m, and the thickness of the bottom plate is 0.275 m.
7. A small box girder structure suitable for a simple girder bridge with a medium and small span according to claim 1, wherein the length of the prefabricated reinforced concrete slab is equal to 20/beam length of the prestressed concrete small box girder.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110607738A (en) * | 2019-09-05 | 2019-12-24 | 中交武汉港湾工程设计研究院有限公司 | Small box girder structure suitable for medium-small span simply supported girder bridge and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110607738A (en) * | 2019-09-05 | 2019-12-24 | 中交武汉港湾工程设计研究院有限公司 | Small box girder structure suitable for medium-small span simply supported girder bridge and construction method thereof |
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