CN211596396U - Precast concrete guardrail connection structure - Google Patents
Precast concrete guardrail connection structure Download PDFInfo
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- CN211596396U CN211596396U CN201922302916.3U CN201922302916U CN211596396U CN 211596396 U CN211596396 U CN 211596396U CN 201922302916 U CN201922302916 U CN 201922302916U CN 211596396 U CN211596396 U CN 211596396U
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- precast concrete
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- 239000011178 precast concrete Substances 0.000 title claims abstract description 53
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 54
- 239000010959 steel Substances 0.000 claims abstract description 54
- 238000010276 construction Methods 0.000 claims abstract description 18
- 238000004873 anchoring Methods 0.000 claims abstract description 16
- 239000011148 porous material Substances 0.000 claims abstract description 15
- 230000003014 reinforcing Effects 0.000 claims abstract description 10
- 239000004567 concrete Substances 0.000 claims description 9
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 abstract description 5
- 238000004642 transportation engineering Methods 0.000 abstract description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000000087 stabilizing Effects 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model relates to a precast concrete guardrail connecting structure, which comprises a girder flange plate and a vertical precast concrete guardrail on the transverse outer side of the girder flange plate; the end part of the main girder flange plate is respectively provided with a main girder flange plate inner side reserved short steel bar and a main girder flange plate outer side reserved long steel bar which vertically extend out of the surface of the main girder flange plate; the inner side surface of the precast concrete guardrail is provided with an embedded steel plate which is welded and fixed with the reserved short steel bars on the inner side of the main beam flange plate; the outside of the precast concrete guardrail is provided with a vertical guardrail reserved anchoring pore passage, and the outside of the main beam flange plate is reserved with a long steel bar which is inserted into the guardrail reserved anchoring pore passage and is fixed through grouting. The utility model discloses in, adopt welding basis reinforcing bar + crab-bolt to connect, easy operation connects convenient and fast, and connection tolerance is big. And the bearing capacity is better, the hoisting and transportation are convenient, the durability is good, the construction risk is small, and the applicability is strong. Because prefabricated festival section both ends are equipped with the section of putting more energy into, can directly connect with the dowel steel, and easy operation easily realizes.
Description
Technical Field
The utility model relates to a precast concrete guardrail technical field, concretely relates to precast concrete guardrail joint construction.
Background
The prefabricated guardrail has the advantages that the traditional construction processes such as factory manufacturing, standardized construction and rapid installation are incomparable, and the requirements on traffic, environment, construction period and the like in construction can be effectively met. Adopt assembled anticollision barrier to have following advantage: the method has the advantages that the method is prefabricated in an industrial mode, stable operating personnel and matched processing equipment are provided, external interference factors are small, and the processing precision and the appearance quality are obviously improved; secondly, a large amount of high-noise, high-pollution and high-risk wet operation is carried to a factory, 80 percent of construction waste is reduced, and the influence of site pouring and tamping construction on peripheral noise, dust and the like is greatly reduced; the time of 3-5 days is needed for cast-in-place, the prefabrication, assembly and construction can be finished within 1 day, most of work is transferred to a factory, and the risk of field high-altitude operation of operating personnel is greatly reduced; the prefabricated anti-collision wall can embed the street lamp pipeline, the lamp post embedded part, the railing embedded part, the communication pipeline, the electric box and the like, so that the quality and the precision are improved, and the construction period is shortened.
Disclosure of Invention
The utility model aims at providing a precast concrete guardrail joint construction reduces the construction risk for the efficiency of construction.
The utility model discloses the technical scheme who adopts does:
the utility model provides a precast concrete guardrail joint construction which characterized in that:
the connecting structure comprises a main beam flange plate and a prefabricated concrete guardrail vertically arranged on the transverse outer side of the main beam flange plate;
the end part of the main girder flange plate is respectively provided with a main girder flange plate inner side reserved short steel bar and a main girder flange plate outer side reserved long steel bar which vertically extend out of the surface of the main girder flange plate;
the inner side surface of the precast concrete guardrail is provided with an embedded steel plate which is welded and fixed with the reserved short steel bars on the inner side of the main beam flange plate; the outside of the precast concrete guardrail is provided with a vertical guardrail reserved anchoring pore passage, and the outside of the main beam flange plate is reserved with a long steel bar which is inserted into the guardrail reserved anchoring pore passage and is fixed through grouting.
Be provided with the steel sheet anchor reinforcing bar in the precast concrete guardrail, pre-buried steel sheet welds in steel sheet anchor reinforcing bar and is anchored inside precast concrete guardrail.
The bridge deck is arranged above the girder flange plates, a longitudinal gap is reserved between the outer ends of the bridge deck and the inner side faces of the precast concrete guardrails, and concrete is poured to form a post-pouring belt.
The precast concrete guardrail is precast in sections longitudinally, and each section comprises stiffening parts at two longitudinal ends and a middle part; the middle part is provided with a longitudinal flower groove; the stiffening part is provided with a lightening hole.
The stiffening part of each section of the precast concrete guardrail is provided with a longitudinal hole, and the adjacent sections are longitudinally connected through a dowel bar arranged at the position of the hole;
the dowel bar is a stainless steel screw rod, and the end part of the dowel bar is fixed through a nut.
The outer side of the bottom surface of the precast concrete guardrail is provided with a limiting part extending downwards, and the inner side surface of the limiting part abuts against the outer end surface of the main beam flange plate.
And a mortar cushion layer is arranged between the bottom surface of the precast concrete guardrail and the surface of the main beam flange plate.
The inner wall of the reserved anchoring pore passage of the guardrail is provided with a corrugated pipe.
The utility model has the advantages of it is following:
the utility model discloses in, adopt welding basis reinforcing bar + crab-bolt to connect, easy operation connects convenient and fast, and connection tolerance is big. And the bearing capacity is better, the hoisting and transportation are convenient, the durability is good, the construction risk is small, and the applicability is strong. Because prefabricated festival section both ends are equipped with the section of putting more energy into, can directly connect with the dowel steel, and easy operation easily realizes.
Drawings
Fig. 1 is a structural view of an intermediate portion connection structure.
Fig. 2 is a structural view of a connection structure of a stiffening part.
FIG. 3 is a schematic view of a partial macro-pattern A-A.
Fig. 4 is an elevation view of the connection configuration.
In the figure: 1-girder flange plate; 2, prefabricating a concrete guardrail; 3, post-pouring a belt; 4, reserving short steel bars on the inner side of the flange plate of the main girder; 5, reserving long steel bars outside the flange plates of the main girder; 6, pre-burying a steel plate; 7, anchoring steel bars by steel plates; 8, reserving an anchoring pore passage on the guardrail; 9-bridge deck; 10-dowel bar.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The utility model relates to a precast concrete guardrail connecting structure, which comprises a girder flange plate 1 and a precast concrete guardrail 2 which is vertical at the transverse outer side of the girder flange plate; the end part of the main girder flange plate 1 is respectively provided with a main girder flange plate inner side reserved short steel bar 4 and a main girder flange plate outer side reserved long steel bar 5 which vertically extend out of the surface of the main girder flange plate 1; the inner side surface of the precast concrete guardrail 2 is provided with an embedded steel plate 6 which is welded and fixed with the reserved short steel bars 4 on the inner side of the main beam flange plate; the outside of precast concrete guardrail 2 is provided with vertical guardrail and reserves anchor pore 8, and girder flange plate outside is reserved long reinforcing bar 5 and is inserted the guardrail and reserves anchor pore 8 and realize fixing through the grout, and 8 inner walls in guardrail reservation anchor pore are provided with the bellows.
Be provided with steel sheet anchor reinforcing bar 7 in the precast concrete guardrail 2, pre-buried steel sheet 6 welds in steel sheet anchor reinforcing bar 7 and is anchored inside precast concrete guardrail 2.
The bridge deck plate 9 is arranged above the girder flange plate 1, a longitudinal gap is reserved between the outer end of the bridge deck plate 9 and the inner side surface of the precast concrete guardrail 2, and concrete is poured to form a post-pouring belt 3.
The precast concrete guardrail 2 is longitudinally precast in sections, and each section comprises a stiffening part and a middle part at two longitudinal ends; the middle part is provided with a longitudinal flower groove; the stiffening part is provided with a lightening hole. The stiffening part of each section of the precast concrete guardrail 2 is provided with a longitudinal hole, and the adjacent sections are longitudinally connected through a dowel bar 10 arranged at the position of the hole; dowel bar 10 is a stainless steel screw rod, and the end is fixed through a nut.
The outer side of the bottom surface of the precast concrete guardrail 2 is provided with a limiting part extending downwards, and the inner side surface of the limiting part abuts against the outer end surface of the main beam flange plate 1.
A mortar cushion layer is arranged between the bottom surface of the precast concrete guardrail 2 and the surface of the main beam flange plate 1.
The assembling method of the precast concrete guardrail connecting structure comprises the following steps:
the method comprises the following steps: the method comprises the following steps of prefabricating a concrete guardrail 2 in sections, presetting a vertical guardrail reserved anchoring pore passage 8 at the outer side of the precast concrete guardrail 2, and presetting a pre-buried steel plate 6 at the inner side;
step two: respectively presetting a short reinforcing steel bar 4 reserved on the inner side of the main girder flange plate and a long reinforcing steel bar 5 reserved on the outer side of the main girder flange plate at the end part of the main girder flange plate 1, and vertically extending out of the surface of the main girder flange plate 1;
step three: hoisting a precast concrete guardrail 2 to the end part of a main girder flange plate 1, welding reserved short steel bars 4 on the inner side of the main girder flange plate and embedded steel plates 6 on two sides, inserting reserved long steel bars 5 on the outer side of the main girder flange plate into reserved anchoring pore canals 8 of the guardrail, and pouring slurry to anchor the guardrail;
step four: constructing the next section of the precast concrete guardrail 2, and connecting the sections by adopting a dowel bar 10;
step five: and a longitudinal gap is reserved between the outer end of the bridge deck 9 above the girder flange plate 1 and the inner side surface of the precast concrete guardrail 2, and concrete is poured to form a post-pouring belt 3.
As shown in the figure, the structure of the utility model comprises at least one segment of precast concrete guardrail and a girder flange plate. The prefabricated guardrail is welded with the embedded steel plate at the bottom of the inner side of the guardrail through the vertical main reinforcement reserved on the bridge deck; and adopting a grouting method to anchor the reserved steel bars of the main beam flange plates in the reserved hole channels of the guardrails so as to realize the connection between the prefabricated guardrails and the bridge deck plates; the two ends of the prefabricated section are provided with stiffening sections.
When the guardrail is prefabricated, a steel plate and an anchoring pore channel are embedded at the bottom of a guardrail prefabricated block; when the main beam is prefabricated, steel bars are embedded in corresponding positions of flange plates of the main beam; when the bridge deck is constructed, a reserved post-pouring belt of 20-25 cm is reserved at the position close to the guardrail; the prefabricated sections are connected by dowel bars.
The utility model discloses a construction flow does:
1) factory prefabrication of guard bar
When the guardrail is prefabricated, reserving a pore passage through which a main girder anchoring steel bar passes and an anchoring steel plate welded with the main girder anchoring steel bar;
2) stacking, hoisting and transporting prefabricated guardrail component
The prefabricated guardrail components should be made into corresponding stacking schemes according to the rigidity and stress conditions of the prefabricated guardrail components, and necessary supporting measures should be taken into consideration when the prefabricated guardrail components are placed vertically.
3) Hoisting and positioning of prefabricated guardrail
Hoisting the prefabricated guardrail by adopting hoisting tools such as a truck crane or a bridge girder erection machine and the like according to the weight of the hoisted guardrail; the guardrail is stably and slowly hoisted, and collision and the like are strictly prohibited; after the guardrail sections are hoisted in place, the guardrail is positioned and fixed through temporary stabilizing measures and connecting measures among the sections so as to ensure the stability of the guardrail.
4) On-site assembling of prefabricated guardrail and main beam
Roughening the spliced surfaces of the bottom of the prefabricated guardrail and the flange plate of the main beam, and paving a TGM60 mortar cushion layer with the thickness of 20mm after the spliced surfaces are soaked in clean water; derusting the pre-buried steel plate of the guardrail and the reserved steel bars of the flange plate of the main beam; hoisting the prefabricated guardrail in place, carrying out double-sided welding on reserved steel bars on the inner side of a main beam and a guardrail embedded steel plate, enabling the reserved steel bars on the outer side of the main beam to penetrate through reserved metal corrugated pipe pore passages, and pouring high-strength shrinkage-free cement grouting material to be anchored in the guardrail; welding the bridge deck reinforcing mesh and the outer side surfaces of the guardrail embedded steel plates, and then pouring self-compacting micro-expansion concrete to complete splicing construction of the prefabricated guardrails and the main beams; and constructing the next section of prefabricated guardrail according to the flow, wherein the guardrail sections are connected by adopting M27 stainless steel screws.
The content of the present invention is not limited to the examples, and any equivalent transformation adopted by the technical solution of the present invention is covered by the claims of the present invention by those skilled in the art through reading the present invention.
Claims (8)
1. The utility model provides a precast concrete guardrail joint construction which characterized in that:
the connecting structure comprises a main beam flange plate (1) and a prefabricated concrete guardrail (2) which is vertical on the transverse outer side of the main beam flange plate;
the end part of the main beam flange plate (1) is respectively provided with a main beam flange plate inner side reserved short steel bar (4) and a main beam flange plate outer side reserved long steel bar (5), and the main beam flange plate outer side reserved short steel bar and the main beam flange plate outer side reserved long steel bar vertically extend out of the surface of the main beam flange plate (1);
the inner side surface of the precast concrete guardrail (2) is provided with an embedded steel plate (6) which is welded and fixed with a reserved short steel bar (4) at the inner side of the main beam flange plate; the outer side of the precast concrete guardrail (2) is provided with a vertical guardrail reserved anchoring hole (8), and long steel bars (5) are reserved on the outer side of the main beam flange plate and inserted into the guardrail reserved anchoring hole (8) to be fixed through grouting.
2. The precast concrete guard rail connection structure of claim 1, wherein:
be provided with steel sheet anchor reinforcing bar (7) in precast concrete guardrail (2), pre-buried steel sheet (6) weld in steel sheet anchor reinforcing bar (7) and by the anchor inside precast concrete guardrail (2).
3. The precast concrete guard rail connection structure of claim 2, wherein:
the bridge deck (9) is arranged above the girder flange plate (1), a longitudinal gap is reserved between the outer end of the bridge deck (9) and the inner side surface of the precast concrete guardrail (2), and concrete is poured to form a post-pouring belt (3).
4. The precast concrete guard rail connection structure of claim 3, wherein:
the precast concrete guardrail (2) is longitudinally precast in sections, and each section comprises a stiffening part at two longitudinal ends and a middle part; the middle part is provided with a longitudinal flower groove; the stiffening part is provided with a lightening hole.
5. The precast concrete guard rail connection structure of claim 4, wherein:
the stiffening part of each section of the precast concrete guardrail (2) is provided with a longitudinal hole, and the adjacent sections are longitudinally connected through a dowel bar (10) arranged at the position of the hole;
the dowel bar (10) is a stainless steel screw rod, and the end part of the dowel bar is fixed through a nut.
6. The precast concrete guard rail connection structure of claim 5, wherein:
the outer side of the bottom surface of the precast concrete guardrail (2) is provided with a limiting part extending downwards, and the inner side surface of the limiting part abuts against the outer end surface of the main beam flange plate (1).
7. The precast concrete guard rail connection structure of claim 6, wherein:
a mortar cushion layer is arranged between the bottom surface of the precast concrete guardrail (2) and the surface of the main beam flange plate (1).
8. The precast concrete guard rail connection structure of claim 7, wherein:
the inner wall of the reserved anchoring pore canal (8) of the guardrail is provided with a corrugated pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922302916.3U CN211596396U (en) | 2019-12-20 | 2019-12-20 | Precast concrete guardrail connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922302916.3U CN211596396U (en) | 2019-12-20 | 2019-12-20 | Precast concrete guardrail connection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211596396U true CN211596396U (en) | 2020-09-29 |
Family
ID=72593781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922302916.3U Active CN211596396U (en) | 2019-12-20 | 2019-12-20 | Precast concrete guardrail connection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211596396U (en) |
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2019
- 2019-12-20 CN CN201922302916.3U patent/CN211596396U/en active Active
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