CN218479024U - Continuous small box girder structure and prefabricated assembled concrete bridge - Google Patents
Continuous small box girder structure and prefabricated assembled concrete bridge Download PDFInfo
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- CN218479024U CN218479024U CN202222672591.XU CN202222672591U CN218479024U CN 218479024 U CN218479024 U CN 218479024U CN 202222672591 U CN202222672591 U CN 202222672591U CN 218479024 U CN218479024 U CN 218479024U
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Abstract
The utility model provides a continuous little box girder structure and prefabricated assembled concrete bridge, including two sections at least box girder bodies to and set up the cast-in-place continuous section in the middle of two sections adjacent box girder bodies of well fulcrum department, wherein, the cast-in-place continuous section is including the ordinary concrete connecting portion that the ordinary concrete placement that is located cast-in-place continuous section bottom formed, and is located the ultra high performance concrete connecting portion that the ultra high performance concrete placement on ordinary concrete connecting portion upper portion formed. The utility model discloses a continuous little box girder structure is better with prefabricated assembled concrete bridge economic nature.
Description
Technical Field
The utility model relates to a prefabricated assembled beam bridge technical field, in particular to continuous little case girder construction and prefabricated assembled concrete bridge.
Background
At present, the most widely applied and most occupied structure in a highway bridge is a continuous small box girder structure. The continuous small box girder structure has the advantages of high production efficiency, good construction quality control, low construction cost and the like. When the bridge is not less than 2 spans, a form of simply supporting firstly and then structurally continuous is often adopted. Because the common concrete (NC) has low tensile strength, the bridge roof is easy to crack in the middle fulcrum hogging moment area, thereby not only influencing the driving safety and the comfort, but also reducing the bearing capacity and the durability of the continuous small box girder structure.
In order to solve the problem of bridge deck cracking in the hogging moment area of the continuous small box girder structure, a prestressed steel beam is usually tensioned on a top plate of the continuous small box girder structure. After the beam body is erected, the prestressed steel beam can be tensioned after the cast-in-place section of the pier top is poured and reaches a certain strength, and special tensioning equipment is needed for batch tensioning. The scheme not only has limited pre-stored compressive stress on the bridge top plate in the middle fulcrum hogging moment area, but also can not fundamentally solve the problem of cracking of the bridge deck of the continuous small box girder structure, and also has the problems of more construction steps, high construction control difficulty, inconvenience in construction and the like. In addition, the prestressed steel bundles are grooved on the prefabricated concrete bridge roof, and the durability of anchor sealing and waterproof measures is difficult to ensure, so that the defects of anchor corrosion, prestress failure and the like are frequent.
In order to solve the problems of bridge deck cracking in the hogging moment area of the continuous small box girder structure and the problems of complex construction and difficult maintenance of the prestressed steel beam tensioning on the top plate of the girder body in the hogging moment area of the continuous small box girder structure, the prior art provides the continuous small box girder structure with the girder body made of ultra-high performance concrete. The Ultra-High Performance Concrete (UHPC) has the characteristics of High strength, high ductility and High durability. However, the ultra-high performance concrete also has the characteristic of high cost, and the problem of poor economical efficiency exists when the ultra-high performance concrete is used for directly replacing a common concrete bridge roof.
Therefore, the existing continuous small box girder structure needs to be improved, so that the problem of bridge deck cracking in the hogging moment area of the continuous small box girder structure is solved, and meanwhile, the continuous small box girder structure has the characteristic of better economical efficiency.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a continuous little case girder construction and prefabricated assembled concrete bridge to solve the problem that current continuous little case girder construction and prefabricated assembled concrete bridge hogging moment district bridge floor cracked easily.
In order to solve the technical problem, the utility model provides a continuous little box girder structure, including two section at least box girder bodies to and set up the cast-in-place continuous section in the middle of two sections adjacent box girder bodies of well fulcrum department, wherein, the cast-in-place continuous section is including the ordinary concrete connecting portion that are formed by ordinary concrete pouring that are located cast-in-place continuous section bottom, and is located the ultra high performance concrete connecting portion that are formed by ultra high performance concrete pouring on ordinary concrete connecting portion upper portion.
Optionally, the thickness of the ultra-high performance concrete connecting part is 1/5-1/4 of the thickness of the whole cast-in-place continuous section.
Optionally, the longitudinal steel bar of the box girder body near the middle fulcrum end extends out of the box girder body and correspondingly extends into the cast-in-place continuous section.
Optionally, the section of the ultra-high performance concrete connecting part is in an inverted trapezoid shape.
Optionally, the box girder body includes a bottom plate, a top plate, and two webs connecting the bottom plate and the top plate, and the top plate includes a top plate body, a structural groove formed in the top plate body, and a filling layer poured in the structural groove, where the structural groove is located in the hogging moment region of the box girder body, the top plate body is formed by pouring ordinary concrete, and the filling layer is formed by pouring ultrahigh-performance concrete.
Optionally, the length of the filling layer is 0.15-0.2 times of the length of the single box girder body.
Optionally, the hoop reinforcement of the web plate of the box girder body extends into the structural groove.
Optionally, the bottom plate and the web plate of the box girder body are formed by pouring common concrete.
Optionally, the common concrete is C50 concrete.
The utility model also provides a prefabricated assembled concrete bridge, including foretell little case girder construction in succession.
The utility model provides a pair of continuous little case girder construction and prefabricated assembled concrete bridge have following beneficial effect:
by arranging the cast-in-place continuous section at the middle pivot point between the two adjacent sections of box girder bodies, pouring the common concrete connecting part at the bottom of the cast-in-place continuous section by common concrete, and pouring the ultra-high performance concrete connecting part at the upper part of the common concrete connecting part by ultra-high performance concrete, compared with a continuous small box girder structure in which the cast-in-place continuous section is entirely poured by common concrete, the upper part of the cast-in-place continuous section can have high strength, high ductility and high durability, so that the characteristics of the upper part of the cast-in-place continuous section can be improved, the upper surface of the cast-in-place continuous section is prevented from cracking, and simultaneously, compared with a continuous small box girder structure in which the cast-in-place continuous section is entirely poured by ultra-high performance concrete, the using amount of the ultra-high performance concrete can be reduced, and therefore, the cost can be reduced, and the economy of the continuous small box girder structure can be improved.
Drawings
FIG. 1 is an elevation view of a continuous box girder construction according to an embodiment of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view of the continuous box girder construction of FIG. 1 taken along plane A-A;
fig. 3 is a cross-sectional view of the continuous box girder structure of fig. 1 taken along plane B-B.
Description of reference numerals:
100-box girder body; 110-a base plate; 120-a top plate; 121-top plate body; 122-structural grooves; 123-a filling layer; 130-a web;
210-normal concrete joints; 220-ultra high performance concrete joint.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
Referring to fig. 1, 2 and 3, fig. 1 is an elevation view ofbase:Sub>A continuous box girder structure according to an embodiment of the present invention, fig. 2 isbase:Sub>A sectional view of the continuous box girder structure alongbase:Sub>A planebase:Sub>A-base:Sub>A in fig. 1, and fig. 3 isbase:Sub>A sectional view of the continuous box girder structure alongbase:Sub>A plane B-B in fig. 1, and this embodiment providesbase:Sub>A continuous box girder structure including at least two sections of box girder bodies 100 andbase:Sub>A cast-in-place continuous section disposed between two adjacent sections of box girder bodies 100 atbase:Sub>A center point, wherein the cast-in-place continuous section includesbase:Sub>A general concrete connection part 210 formed by casting general concrete at the bottom of the cast-in-place continuous section and an ultra high performance concrete connection part 220 formed by casting ultra high performance concrete at the upper part of the general concrete connection part 210.
Through the cast-in-place continuous section arranged at the middle pivot point between the two adjacent sections of box girder bodies 100, the common concrete connecting part 210 at the bottom of the cast-in-place continuous section is formed by casting common concrete, and the ultra-high performance concrete connecting part 220 at the upper part of the common concrete connecting part 210 is formed by casting ultra-high performance concrete, compared with a continuous small box girder structure in which the cast-in-place continuous section is formed by casting common concrete, the upper part of the cast-in-place continuous section has high strength, high ductility and high durability, so that the characteristics of the upper part of the cast-in-place continuous section can be improved, the upper surface of the cast-in-place continuous section is prevented from cracking, and compared with a continuous small box girder structure in which the cast-in-place continuous section is formed by casting ultra-high performance concrete, the using amount of the ultra-high performance concrete can be reduced, the cost can be reduced, and the economy of the continuous small box girder structure can be improved.
Referring to fig. 1 and 3, the thickness of the ultra-high performance concrete connection part 220 is 1/5 to 1/4 of the thickness of the entire cast-in-place continuous section.
In this embodiment, the longitudinal steel bars of the box girder body 100 near the middle pivot end extend out of the box girder body 100 and correspondingly extend into the cast-in-situ continuous section.
Referring to fig. 3, the ultra high performance concrete connecting portion 220 has a substantially inverted trapezoidal cross-section.
Referring to fig. 1 and 2, the box girder body 100 includes a bottom plate 110, a top plate 120 and two webs 130 connecting the bottom plate 110 and the top plate 120, the top plate 120 includes a top plate body 121, a structural groove 122 opened on the top plate body 121, and a filling layer 123 cast in the structural groove 122, wherein the structural groove 122 is located in a negative bending moment region of the box girder body 100, the top plate body 121 is cast of ordinary concrete, and the filling layer 123 is cast of ultra high performance concrete.
Since the structural groove 122 is located in the hogging moment region of the box girder body 100, the filling layer 123 is cast in the structural groove 122, the top plate body 121 is cast of ordinary concrete, and the filling layer 123 is cast of ultra-high performance concrete, strength, ductility and durability of the surface layer of the top plate 120 located in the hogging moment region can be improved as compared with a continuous small box girder structure in which the entire top plate 120 is cast of ordinary concrete, so that surface cracking of the hogging moment region of the continuous small box girder structure can be prevented, and at the same time, cost can be reduced and economy of the continuous small box girder structure can be improved as compared with a continuous small box girder structure in which the entire top plate 120 is cast of ultra-high performance concrete. In addition, the problem of cracking of the hogging moment area of the continuous small box girder structure can be solved by adopting the structure of the small box girder in the embodiment, so that the prestressed steel beams do not need to be tensioned in the top plate 120, the construction process of the continuous small box girder structure can be simplified, the construction efficiency is improved, and the maintenance difficulty of the small box girder is reduced.
Referring to fig. 1, the filling layer 123 is 0.15 to 0.2 times the length of a single box girder body 100, that is, 0.15 to 0.2 times the standard span of the box girder body 100.
The stirrups of the web 130 of the box girder body 100 extend into the structural groove 122.
The bottom plate 110 and the web 130 of the box girder body 100 are cast of general concrete.
In this embodiment, the common concrete is C50 concrete.
In this embodiment, the construction process of the continuous box girder structure is substantially as follows:
firstly, when the box girder body 100 is prefabricated, a baffle between the filling layer 123 and the top plate body 121 is additionally arranged on the basis of an original box girder body 100 template, the baffle is removed after ordinary concrete is poured for 24 hours, and then the remaining filling layer 123 of the box girder body 100 is poured.
Secondly, when the box girder body 100 is prefabricated, a pore channel for tensioning the hogging moment steel bundles at the pier top does not need to be reserved in the top plate 120 of the box girder body 100.
And thirdly, when the box girder body 100 is prefabricated, the longitudinal steel bars of the box girder body 100 close to the middle fulcrum end extend out of the box girder body 100 for a certain length (15-20 cm) and are embedded into the subsequent cast-in-situ continuous section to ensure that the cast-in-situ continuous section and the prefabricated girder body can be continuously stressed and transferred.
And, when the cast-in-place continuous section is poured after the box girder body 100 is erected, the bottom common concrete connecting part 210 is poured first, and the remaining ultrahigh-performance concrete connecting part 220 at the top is poured after 24 hours.
The present embodiment also provides a prefabricated concrete bridge comprising the continuous box girder structure of the above embodiments.
The prefabricated concrete bridge in the embodiment comprises a conventional small box girder bridge with a medium-small span, and the span of the prefabricated concrete bridge comprises but is not limited to the conventional medium-small span of 20-50 m.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.
Claims (10)
1. The continuous small box girder structure is characterized by comprising at least two sections of box girder bodies and a cast-in-place continuous section arranged between two adjacent sections of box girder bodies at a middle pivot point, wherein the cast-in-place continuous section comprises a common concrete connecting part which is positioned at the bottom of the cast-in-place continuous section and is formed by casting common concrete and an ultrahigh-performance concrete connecting part which is positioned at the upper part of the common concrete connecting part and is formed by casting ultrahigh-performance concrete.
2. The continuous box girder structure according to claim 1, wherein the thickness of the ultra-high performance concrete connection part is 1/5 to 1/4 of the thickness of the entire cast-in-place continuous section.
3. A continuous box girder construction according to claim 1 wherein the longitudinal reinforcement of the box girder body near the mid-pivot end extends out of the box girder body and into the cast-in-place continuous section accordingly.
4. The continuous box girder structure according to claim 1, wherein the ultra-high performance concrete connection part has an inverted trapezoidal section.
5. The continuous box girder structure according to claim 1, wherein the box girder body comprises a bottom plate, a top plate and two webs connecting the bottom plate and the top plate, the top plate comprises a top plate body, a structural groove opened in the top plate body, and a filling layer poured in the structural groove, wherein the structural groove is located in the negative moment region of the box girder body, the top plate body is poured by ordinary concrete, and the filling layer is poured by ultra high performance concrete.
6. The continuous trabecular structure as recited in claim 5, wherein said filling layer is between 0.15 and 0.2 times the length of a single box girder body.
7. The continuous box girder construction according to claim 5 wherein the stirrups of the web of the box girder body project into the structural channels.
8. The continuous box girder structure according to claim 5, wherein the bottom plates and the web plates of the box girder body are cast of ordinary concrete.
9. The continuous box girder construction according to claim 1, wherein the common concrete is C50 concrete.
10. A prefabricated concrete bridge, comprising a continuous box girder structure according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222672591.XU CN218479024U (en) | 2022-10-11 | 2022-10-11 | Continuous small box girder structure and prefabricated assembled concrete bridge |
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| CN202222672591.XU CN218479024U (en) | 2022-10-11 | 2022-10-11 | Continuous small box girder structure and prefabricated assembled concrete bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117385723A (en) * | 2023-04-28 | 2024-01-12 | 河南省黄河高速公路有限公司 | Assembled large-span double-side-box continuous composite beam and construction method thereof |
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2022
- 2022-10-11 CN CN202222672591.XU patent/CN218479024U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117385723A (en) * | 2023-04-28 | 2024-01-12 | 河南省黄河高速公路有限公司 | Assembled large-span double-side-box continuous composite beam and construction method thereof |
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