CN112064487A - Non-prestressed continuous bridge pier top continuous section structure and construction method - Google Patents
Non-prestressed continuous bridge pier top continuous section structure and construction method Download PDFInfo
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- CN112064487A CN112064487A CN202010823792.8A CN202010823792A CN112064487A CN 112064487 A CN112064487 A CN 112064487A CN 202010823792 A CN202010823792 A CN 202010823792A CN 112064487 A CN112064487 A CN 112064487A
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- 238000010276 construction Methods 0.000 title claims abstract description 25
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 19
- 230000008719 thickening Effects 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 5
- 238000003466 welding Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000004568 cement Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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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
- E01D1/00—Bridges in general
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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
- 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
- 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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- Civil Engineering (AREA)
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Abstract
The embodiment of the invention discloses a non-prestressed continuous bridge pier top continuous section structure and a construction method, wherein the structure comprises the following components: a T-shaped cast-in-place section is formed between the prefabricated main beam and two adjacent prefabricated main beams; prefabricated girder includes: the flange is arranged at the top of the main beam web; the cast-in-place section of T type includes: a concrete layer and a high tensile strength concrete layer; and reinforcing steel bars are longitudinally arranged in the web plate and the flange of the main beam respectively and extend into the T-shaped cast-in-place section. Through above-mentioned scheme, directly form T type space between two adjacent prefabricated girders, can directly pour the cast-in-place section of T type in this T type space, need not carry out the mould to build again to the edge of a wing part, saved the manpower, reduced the pouring volume of high tensile concrete when guaranteeing structure atress safety, very big simplification the construction process of continuous bridge, material saving shortens construction cycle.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a non-prestressed continuous bridge pier top continuous section structure and a construction method.
Background
The simply supported continuous system bridge is widely applied to the construction of small and medium span bridges, and has the characteristics of high rigidity, less shrinkage joints and small deformation.
However, the existing simply supported continuous system bridge needs a large amount of high tensile concrete in the construction, and the high tensile concrete is high in price, so that the construction cost of the whole bridge is increased.
Therefore, how to reduce the manufacturing cost on the basis of ensuring that the bridge has higher rigidity becomes a technical problem to be solved urgently at present.
Disclosure of Invention
In view of the above problems, the present invention provides a non-prestressed continuous bridge pier top continuous section structure and construction method to overcome or at least partially solve the above problems.
According to a first aspect of embodiments of the present invention, there is provided a non-prestressed continuous bridge pier top continuous section structure, including: the prefabricated main beam and the T-shaped cast-in-place section cast and formed between two adjacent prefabricated main beams;
the prefabricated girder includes: the flange is arranged at the top of the girder web;
the cast-in-place section of T type includes: a concrete layer and a high tensile strength concrete layer;
and reinforcing steel bars are longitudinally arranged in the main beam web plate and the flange respectively, and the reinforcing steel bars extend into the T-shaped cast-in-place section.
Further, the flange includes: the girder edge of a wing and the prefabricated layer of edge of a wing thickening of integrated into one piece, the girder edge of a wing with the prefabricated layer of edge of a wing thickening forms the notch cuttype structure.
Furthermore, the top of the joint of the main beam flange and the flange thickening prefabricated layer is a right-angle section, and the bottom of the joint is an inclined plane.
Further, the inclination angle of the inclined surface is 45 °.
Further, the length of the main beam flange is larger than that of the flange thickening prefabricated layer.
Further, the concrete layer is poured at the bottom of the T-shaped cast-in-place section, and the high-tensile-strength concrete layer is poured above the concrete layer.
Furthermore, the two sides of the top of the high-tensile concrete layer are poured on the flange thickening prefabricated layer, and the top of the high-tensile concrete layer and the top of the main beam flange are on the same plane.
Furthermore, the steel bars of two adjacent main beam webs are welded into a whole at the joint of the T-shaped cast-in-place section on one side.
And further, tying and welding the steel bars in the flanges.
According to a second aspect of the embodiment of the invention, a non-prestressed continuous bridge pier top continuous section construction method is provided, based on the non-prestressed continuous bridge pier top continuous section structure of the first aspect, the execution steps include:
prefabricating a girder web plate and a flange, wherein the flange is built at the top of the girder web plate, the girder web plate and the flange form a prefabricated girder, and a T-shaped cast-in-place section is formed between two adjacent prefabricated girders;
reinforcing steel bars are longitudinally arranged in the main beam web plate and the flange respectively, and the reinforcing steel bars extend into the T-shaped cast-in-place section;
pouring a concrete layer at the bottom of the T-shaped cast-in-place section;
and pouring a high-tensile-strength concrete layer on the concrete layer in the T-shaped cast-in-place section, so that two sides of the top of the high-tensile-strength concrete layer are poured on the flange thickening prefabricated layer, and the top of the high-tensile-strength concrete layer and the top of the flange of the main beam are on the same plane.
The non-prestressed continuous bridge pier top continuous section structure and the construction method provided by the embodiment of the invention have the following beneficial effects:
according to the technical scheme, the web plate and the flange of the girder form the prefabricated girder, two adjacent prefabricated girders can be used as molds of the cast-in-place sections to form the T-shaped space, and concrete and high-tensile-strength concrete are poured in the T-shaped space to form the T-shaped cast-in-place sections, so that the molds do not need to be built for the cast-in-place sections, manpower is saved, the pouring amount of the high-tensile-strength concrete is reduced while the stress safety of the structure is ensured, the construction process of the continuous bridge is greatly simplified, materials are saved, and the construction period is shortened.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
The invention will be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a non-prestressed continuous bridge pier top continuous section structure according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a non-prestressed continuous bridge pier top continuous section structure according to an embodiment of the present invention.
Description of reference numerals: 1 prefabricated main beam, 11 main beam web plates, 12 flanges, 121 main beam flanges, 122 flanges, thickened prefabricated layers,
the cast-in-place section of 2T type, 21 concrete layer, 22 high tensile concrete layer.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
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, further discussion thereof is not required in subsequent figures.
As shown in fig. 1-2, the non-prestressed continuous bridge pier top continuous section structure of the embodiment includes: the prefabricated main beam comprises prefabricated main beams 1 and a T-shaped cast-in-place section 2 cast and formed between two adjacent prefabricated main beams 1; prefabricated girder 1 includes: the main beam web 11 and the flanges 12, wherein the flanges 12 are arranged at the top of the main beam web 11; the T-shaped cast-in-place section 2 comprises: a concrete layer 21 and a high tensile concrete layer 22; reinforcing steel bars are longitudinally arranged in the main beam web 11 and the flange 12 respectively, and the reinforcing steel bars extend into the T-shaped cast-in-place section 2.
In the scheme, firstly, a prefabricated main beam 1 is constructed, the prefabricated main beam 1 comprises a main beam web 11 and flanges 12, and the two prefabricated main beams 1 are symmetrically arranged by taking the center line of a cast-in-place section as a symmetry axis. The flanges 12 are of stepped structures and are fixed with the girder webs 11, so that a T-shaped space is formed between two adjacent prefabricated girders 1, and a T-shaped cast-in-place section 2 can be poured in the T-shaped space.
One or more reinforcing bars are then provided longitudinally within the spar web 11 and the flanges 12 respectively, and these reinforcing bars extend towards the T-section 2. And welding the reinforcing steel bars extending from the web 11 of the main beam and the reinforcing steel bars extending from the flanges 12.
Before concrete is poured to the bottom of the T-shaped cast-in-place section 2, chiseling is conducted on the contact surface of the concrete on the prefabricated main beam 1, and the chiseling conducts chiseling on the prefabricated main beam 1 to form a rough surface with the concave-convex difference not smaller than 6 mm. This facilitates the adhesion of the concrete and reduces the risk of breakage.
And finally, pouring a concrete layer 21 at the bottom of the T-shaped cast-in-place section 2, wherein the concrete layer 21 cannot exceed the top of the I-shaped section of the T-shaped cast-in-place section 2, then pouring on the basis of the concrete layer 21, and pouring a high-tensile concrete layer 22 at the top of the concrete layer 21.
Through the scheme, girder web and edge of a wing constitute prefabricated girder, two adjacent prefabricated girders can regard as the mould of cast-in-place section, form T type space, and cast concrete and high tensile concrete form the cast-in-place section of T type in T type space, need not build the mould for the cast-in-place section again like this, the manpower has been saved, and reduced the pouring volume of high tensile concrete when guaranteeing structure atress safety, very big simplification the construction process of continuous bridge, material saving shortens construction cycle.
In the particular embodiment, the flanges 12 include: girder flange 121 and the prefabricated layer 122 of edge of a wing thickening of integrated into one piece, girder flange 121 and the prefabricated layer 122 of edge of a wing thickening form the notch cuttype structure.
In the above scheme, the top layer of the flange thickening prefabricated layer 122 and the bottom layer of the main beam flange 121 are on the same plane, so that a stepped structure is formed, and thus, high-tensile concrete can be poured on the upper portion of the concrete layer 21 and the upper portion of the flange thickening prefabricated layer 122, and the continuity of the bridge is further ensured.
In a specific embodiment, the top of the joint between the main beam flange 121 and the flange thickening prefabricated layer 122 is a right-angle section, and the bottom of the joint is an inclined plane.
In the above scheme, in order to make the connection of girder flange 121 and flange thickening prefabricated layer 122, construct "T" type structure for cast-in-place section 2 of T type simultaneously to in order to guarantee the effect of pouring of high tensile concrete, need pour the high tensile concrete before, carry out the chisel hair processing with the contact surface of high tensile concrete. The right-angle section and the inclined surface are combined together to connect the main beam flange 121 and the flange thickening prefabricating layer 122 into a whole.
In a specific embodiment, the inclined surface has an inclination angle of 45 °. The inclined plane is set to be 45 degrees, so that the stress on two sides can be ensured to be uniform, and the bearing stress of the bridge is increased. The length of the main beam flange 121 is greater than that of the flange thickening prefabricated layer 122.
In the specific embodiment, the concrete layer 21 is cast at the bottom of the T-shaped cast-in-place section 2, and the high tensile strength concrete layer 22 is cast above the concrete layer 21.
Wherein the concrete is formed by mixing cement, water, sand and stones. The high tensile concrete comprises the following raw materials: 300-500 parts of cement, 20-40 parts of polyacrylamide, 150-300 parts of broken stone, 200-300 parts of river sand, 5-15 parts of coal ash, 5-15 parts of mineral powder, 5-15 parts of Gray fiber, 1-3 parts of a heat stabilizer, 0.5-1 part of an anti-aging agent and 200-300 parts of water. The tensile strength of the high-tensile concrete is not less than 10MPa, the expansion rate is between 0.02 and 0.04 percent, and the other performance indexes are not lower than the requirements of C50 concrete.
The concrete layer 21 is poured firstly, after the concrete layer 21 is solidified, chiseling treatment is carried out on the upper surface of the concrete layer 21, and then the high-tensile-strength concrete is poured, so that the high-tensile-strength concrete is favorably adhered to the concrete, and the probability of fracture is reduced.
In the specific embodiment, two sides of the top of the high tensile concrete layer 22 are poured on the flange thickening precast layer 122, and the top of the high tensile concrete layer 22 and the top of the main beam flange 121 are on the same plane. Therefore, a flat plane is formed on the bridge floor, and the flat effect of the bridge floor is ensured.
In the specific embodiment, the reinforcing steel bars of two adjacent main beam webs 11 are welded into a whole at the joint of the T-shaped cast-in-place section 2 on one side. The quantity of the reinforcing bar of two adjacent girder webs 11 is the same, like this, the reinforcing bar of both sides can two liang of overlap joints to the single face welding is in the same place, and then guarantees adjacent prefabricated girder 1's linking effect, reduces the cracked condition of appearance.
In the embodiment, the steel bars in the flanges 12 are subjected to band-closing welding to connect the steel bars. The reinforcing steel bar on the flange 12 can be thickened, and meanwhile, the reinforcing steel bar is subjected to band-closing welding and connection, so that the strength of the reinforcing steel bar is further improved, and the fixing effect is improved.
Through the above-mentioned scheme of this embodiment, need not build the mould for cast-in-place section again, saved the manpower, reduced the pouring volume of high tensile concrete when guaranteeing structure atress safety, very big simplification the construction process of continuous bridge, material saving shortens construction cycle.
Based on the non-prestressed continuous bridge pier top continuous section structure of the embodiment, the non-prestressed continuous bridge pier top continuous section construction method is provided, and the execution steps comprise:
step 201, prefabricating a girder web plate and a flange, wherein the girder web plate and the flange form a prefabricated girder, and a T-shaped cast-in-place section is formed between two adjacent prefabricated girders.
Step 202, reinforcing steel bars are longitudinally arranged in the web plate and the flange of the main beam respectively, and the reinforcing steel bars extend into the T-shaped cast-in-place section.
And step 203, pouring a concrete layer at the bottom of the T-shaped cast-in-place section.
And 204, pouring a high-tensile concrete layer on the concrete layer in the T-shaped cast-in-place section, so that two sides of the top of the high-tensile concrete layer are poured on the flange thickening prefabricated layer, and the top of the high-tensile concrete layer and the top of the flange of the main beam are on the same plane.
The non-prestressed continuous bridge pier top continuous section structure according to another embodiment of the invention is described in detail as follows:
the method comprises the following steps:
the prefabricated main beam, prefabricated main beam 1 includes the web (promptly, girder web 11), the edge of a wing (promptly, edge of a wing 12) and longitudinal reinforcement and the stirrup of configuration, and the edge of a wing is thickened at prefabricated main beam 1, and is under construction simultaneously with prefabricated main beam, adopts high tensile concrete cast in situ in the upper strata on the edge of a wing.
The pier top cast-in-place continuous section (namely the T-shaped cast-in-place section 2) is positioned between two adjacent prefabricated main beams 1 and is divided into two parts, wherein the first part adopts cast-in-place ordinary concrete, and the second part adopts cast-in-place high tensile concrete.
Longitudinal steel bars are arranged in the webs, and the web longitudinal steel bars of the two prefabricated main beams 1 are overlapped at the cast-in-place continuous section at the pier top and are welded at one side.
Longitudinal steel bars are also arranged in the flanges, thickening is carried out in the two flange thickening prefabricated layers 122, and the steel bars are tied and connected beside the thickened steel bars in a band-closing mode.
Before pouring the high tensile concrete, the contact surface of the high tensile concrete needs to be roughened, and rough surfaces with the concave-convex difference not less than 6mm are chiseled.
Based on the above, the construction steps are as follows:
a. two sections of adjacent prefabricated main beams are erected.
b. And longitudinal steel bars for connecting two adjacent sections of prefabricated main beams are configured.
c. And pouring common concrete at the T-shaped cast-in-place section.
d. And pouring high-tensile-strength concrete in the T-shaped cast-in-place section.
Wherein, the tensile strength of the high tensile concrete is not less than 10MPa, the expansion rate is between 0.02 and 0.04 percent, and the other performance indexes are not lower than the requirements of C50 concrete.
The invention has the advantages that: the hogging moment steel bundles of the pier top continuous section are cancelled, the structure of the prefabricated main beam and the reinforcement form of the prefabricated main beam are improved, the construction process of simply supporting and rotating the continuous bridge is greatly simplified while the stress safety of the structure is guaranteed, materials are saved, the construction period is shortened, and the pier top continuous section structure is economical and rapid.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts in the embodiments are referred to each other.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. The utility model provides a continuous section structure in non-prestressing force continuous bridge mound top which characterized in that includes: the prefabricated main beam comprises prefabricated main beams (1) and a T-shaped cast-in-place section (2) formed between two adjacent prefabricated main beams (1) in a pouring mode;
the prefabricated main beam (1) comprises: the main beam comprises a main beam web (11) and flanges (12), wherein the flanges (12) are arranged at the top of the main beam web (11);
the T-shaped cast-in-place section (2) comprises: a concrete layer (21) and a high tensile strength concrete layer (22);
reinforcing steel bars are longitudinally arranged in the main beam web plate (11) and the flanges (12) respectively, and the reinforcing steel bars extend into the T-shaped cast-in-place section (2).
2. The non-prestressed continuous bridge pier top continuous section structure according to claim 1, wherein the flanges (12) comprise: integrally formed girder flange (121) and prefabricated layer of flange thickening (122), girder flange (121) with prefabricated layer of flange thickening (122) forms the notch cuttype structure.
3. The non-prestressed continuous bridge pier top continuous section structure according to claim 2, wherein the top of the joint of the main beam flange (121) and the flange thickening prefabricated layer (122) is a right-angle section, and the bottom of the joint is an inclined plane.
4. The non-prestressed continuous bridge pier top continuous section structure according to claim 3, wherein the inclination angle of said inclined surface is 45 °.
5. The non-prestressed continuous bridge pier top continuous section structure according to any one of claims 2-4, wherein the length of the main beam flange (121) is greater than the length of the thickened prefabricated layer of flanges (122).
6. The non-prestressed continuous bridge pier top continuous section structure according to claim 2, wherein the concrete layer (21) is cast at the bottom of the T-shaped cast-in-place section (2), and the high tensile concrete layer (22) is cast above the concrete layer (21).
7. The non-prestressed continuous bridge pier top continuous section structure according to claim 6, wherein both sides of the top of the high tensile concrete layer (22) are poured on the flange thickening precast layer (122), and the top of the high tensile concrete layer (22) and the top of the main beam flange (121) are on the same plane.
8. The non-prestressed continuous bridge pier top continuous section structure according to claim 1, wherein the steel bars of two adjacent main beam webs (11) are welded into a whole at the joint of the T-shaped cast-in-place section (2) on one side.
9. The non-prestressed continuous bridge pier top continuous section structure according to claim 8, wherein a reinforcing bar is taped and welded to a reinforcing bar in said flange (12).
10. A non-prestressed continuous bridge pier top continuous section construction method, which is characterized in that based on the non-prestressed continuous bridge pier top continuous section structure of any one of claims 1 to 9, the execution steps comprise:
prefabricating a girder web plate and a flange, wherein the flange is built at the top of the girder web plate, the girder web plate and the flange form a prefabricated girder, and a T-shaped cast-in-place section is formed between two adjacent prefabricated girders;
reinforcing steel bars are longitudinally arranged in the main beam web plate and the flange respectively, and the reinforcing steel bars extend into the T-shaped cast-in-place section;
pouring a concrete layer at the bottom of the T-shaped cast-in-place section;
and pouring a high-tensile-strength concrete layer on the concrete layer in the T-shaped cast-in-place section, so that two sides of the top of the high-tensile-strength concrete layer are poured on the flange thickening prefabricated layer, and the top of the high-tensile-strength concrete layer and the top of the flange of the main beam are on the same plane.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113279320A (en) * | 2021-04-29 | 2021-08-20 | 辽宁省交通规划设计院有限责任公司 | Non-prestressed continuous bridge pier top continuous section assembling structure and construction method thereof |
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| CN110004815A (en) * | 2019-03-29 | 2019-07-12 | 辽宁省交通规划设计院有限责任公司 | A kind of non-prestressed freely-supported turns Continuous Bridge and its construction method |
| CN110700089A (en) * | 2019-10-22 | 2020-01-17 | 湖南大学 | Cast-in-place wet joint structure and bridge |
| CN212452227U (en) * | 2020-08-17 | 2021-02-02 | 宁波市高等级公路建设管理中心 | Non-prestressed continuous bridge pier top continuous section structure |
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| CN113279320A (en) * | 2021-04-29 | 2021-08-20 | 辽宁省交通规划设计院有限责任公司 | Non-prestressed continuous bridge pier top continuous section assembling structure and construction method thereof |
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