CN211547269U - Adopt UHPC's city assembled overpass stair - Google Patents
Adopt UHPC's city assembled overpass stair Download PDFInfo
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- CN211547269U CN211547269U CN201922265345.0U CN201922265345U CN211547269U CN 211547269 U CN211547269 U CN 211547269U CN 201922265345 U CN201922265345 U CN 201922265345U CN 211547269 U CN211547269 U CN 211547269U
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Abstract
The utility model relates to an urban assembled overpass stair adopting UHPC, which comprises a stair unit; the stair unit comprises two side beams, at least one middle beam, a step tread, an upper platform and a lower platform; the two side beams are parallel to each other and are positioned at the left side and the right side, the middle beam is positioned between the two side beams and is parallel to the side beams, the step pedal is positioned between the two side beams and is positioned above the middle beam, the upper end of the step pedal is an upper platform, and the lower end of the step pedal is a lower platform; the stair units are integrally poured into a beam-slab structure through UHPC, stressed steel bars are arranged in the upper platform, the lower platform, the side beams and the middle beam, and steel bar meshes are arranged in the step treads. The utility model provides a prefabricated steel stair maintenance cost high and prefabricated ordinary concrete stair from shortcomings such as great, belong to municipal works assembly technical field.
Description
Technical Field
The utility model relates to a municipal works assembly technical field, concretely relates to adopt UHPC's city assembled overline bridge stair.
Background
With the development of building construction technology and social economy, the construction field is pursuing green construction, industrialization and industrialization. The prefabricated assembly type construction technology is characterized in that construction structural members are manufactured in a factory and transported to a construction site, and then hoisting and splicing are completed. The prefabricated construction has short construction period, low time cost, small interference to construction sites and low requirements on site construction conditions, and gradually becomes the development trend of building construction at present. For municipal engineering, such as construction of pedestrian overpasses and matched stair flights, the influence of the prefabricated construction mode on road traffic is much smaller than that of cast-in-place construction on site. At present, the prefabricated building and the prefabricated urban bridge are large, and the prefabricated stairway and other accessory components are small, which indicates that the prefabricated construction technology is widely advocated and popularized.
At present, the design scheme of common overpass stair section prefabrication construction generally adopts a steel structure or a common concrete structure. Although the prefabricated steel structure stair is light in weight and high in rigidity, the steel structure has an inherent disadvantage that the prefabricated steel structure is easy to rust and corrode and poor in durability. Therefore, for the prefabricated steel structure stair, the surface of the prefabricated steel structure stair needs to be regularly painted for corrosion prevention, and the maintenance cost is high. Ordinary concrete stair, because the concrete intensity is low, the footboard can not be hollowed out, still need increase the cross-sectional size of stair to increase bearing capacity and rigidity, consequently the dead weight of stair is very big, is unfavorable for transportation and hoist and mount operation, and the maintenance cycle of ordinary concrete is long, and the preparation time is with high costs.
Ultra-High Performance Fiber reinforced concrete (UHPC for short) has Ultra-strong and Ultra-tough mechanical properties and good durability, becomes a hot point concerned in the field of civil engineering in recent years, has the tensile strength of more than or equal to 5MPa, the breaking strength of more than or equal to 20MPa and the compressive strength of more than 120MPa, and conforms to the trend of sustainable development of assembled structures. The UHPC can perfectly solve the problems of poor durability of the prefabricated steel stairs and low strength, great self-weight and the like of the prefabricated common concrete stairs. In addition, UHPC only needs steam curing for 48 hours to reach ideal strength, the manufacturing period is short, and the time cost is low.
In the prior art, a technology of applying UHPC to a pedestrian overpass stair does not exist, and the improvement of an overpass stair structure adopting UHPC does not exist.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists among the prior art, the utility model aims at: the urban assembled overpass stair adopting the UHPC is provided, and the overpass stair structure is optimized based on the UHPC material. This overline bridge stair can solve the drawback that current prefabricated steel stair maintenance cost is high and prefabricated ordinary concrete stair dead weight is big, and the prefabricated overline bridge stair of this beam slab combination is rational in infrastructure simultaneously, and the atress is better.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a city assembled overpass stair adopting UHPC comprises a stair unit; the stair unit comprises two side beams, at least one middle beam, a step tread, an upper platform and a lower platform; the two side beams are parallel to each other and are positioned at the left side and the right side, the middle beam is positioned between the two side beams and is parallel to the side beams, the step pedal is positioned between the two side beams and is positioned above the middle beam, the upper end of the step pedal is an upper platform, and the lower end of the step pedal is a lower platform; the stair units are integrally poured into a beam-slab structure through UHPC, stressed steel bars are arranged in the upper platform, the lower platform, the side beams and the middle beam, and steel bar meshes are arranged in the step treads.
Preferably, the step tread is hollowed, the thickness of the step tread is 4-5 cm, and a single layer of reinforcing mesh is arranged.
Preferably, the upper platform is installed on the pier capping beam, bolts are embedded in the pier capping beam, and the upper platform is provided with limiting holes matched with the bolts; the lower platform is installed on the pier capping beam or placed on the ground, when installed on the pier capping beam, bolts are embedded in the pier capping beam in advance, and the lower platform is provided with limiting holes matched with the bolts.
Preferably, a plurality of layers of felt are paved between the upper platform and the pier capping beam, and a plurality of layers of felt which is resistant to extrusion and abrasion are paved between the lower platform and the pier capping beam or the ground.
Preferably, the urban assembled overpass stair adopting the UHPC comprises two stair units, wherein one stair unit is an ascending stair way, the other stair unit is a descending stair way, and the two stair units are arranged close to each other from left to right; the surfaces of the two side beams positioned in the middle are level to form a bicycle lane.
Preferably, a gap with the width of 1cm is arranged between the two beams positioned in the middle, and rubber asphalt is used for filling and sealing.
Preferably, the upper ends of the two beams in the middle are flush with the upper plane, and the lower ends of the two beams are flush with the lower plane.
An implementation method of an urban assembled overpass stair adopting UHPC comprises the following steps: (1) erecting a formwork in a prefabricated factory, binding reinforcing steel bars, extending reinforcing mesh of a step tread into reinforcing frameworks in a boundary beam and a middle beam, effectively anchoring and connecting stressed reinforcing steel bars of the boundary beam and the middle beam with stressed reinforcing steel bars of an upper platform and a lower platform, pouring UHPC, and integrally pouring a stair unit into a beam-slab structure through the UHPC; (2) carrying out structural maintenance on the stair unit; (3) and hoisting and splicing the stair units on site.
Preferably, in the step (2), steam curing is carried out at a high temperature of 95 ℃ or higher for 48 hours.
Preferably, the step (3) is that bolts are installed on the pier capping beams which are already constructed, felt is laid on the pier capping beams, the stair units are hoisted, and the limit holes of the stair units are sleeved in the bolts; two stair units are arranged side by side to serve as an ascending stair way and a descending stair way, rubber asphalt is filled in a gap between the two stair units, and the boundary beams on the inner sides of the two stair units form a bicycle path.
The principle of the utility model is that:
the prefabricated overpass stair material mainly adopts ultra-high strength concrete UHPC, and fully utilizes the superior tensile strength and compressive strength of the UHPC, the durability and other mechanical properties. Therefore go upward the ladder way and can adopt beam slab formula structural style with down the ladder way, for hollowing out under the step footboard, thickness only is 4 ~ 5cm, and ordinary precast concrete stair board is solid ladder, same bearing capacity, the utility model discloses overpass stair lighten about more than 40% than ordinary concrete stair dead weight, more do benefit to transportation, hoist and mount concatenation construction. UHPC can reach ideal strength only by steam curing for 48 hours, and has short manufacturing period and low time cost. In addition, by utilizing the high compression resistance and tensile resistance of the UHPC material, compared with the common concrete stair, the using amount of the reinforcing steel bar is reduced by about 30 percent.
Furthermore, the utility model discloses stair will go up the ladder way, down the ladder way separately prefabricated manufacturing, and the back hoist and mount splices into wholly, more is favorable to transporting and hoist and mount concatenation construction. After the side beams of the ascending and descending ladder way are combined together, the top surface can be used as a bicycle chute, and the gap between the side beams is filled with rubber asphalt to prevent water seepage.
The utility model discloses overpass stair go up the ladder way and respectively reserve 2 spacing holes with the upper and lower platform of down ladder way, with the pier bent cap on correspond the pre-buried bolt of position and fix prefabricated staircase unit together, the platform that falls on ground can not need the bolt fastening, and the multilayer felt of bedding under the platform to prevent extrusion wearing and tearing between the different components, make job site hoist and mount concatenation operation more simple and convenient, quicker.
The utility model has the advantages of as follows:
1. the prefabricated overpass stair material adopts ultra-high performance concrete UHPC, and the structural style is improved and optimized compared with the common plate stair, adopts the beam slab stair structural style, solves the defects of high maintenance cost of the prefabricated steel stair, heavy self weight of the prefabricated common concrete stair and the like, and is more beneficial to the transportation and the field operation of a prefabricated structure.
And 2. the maintenance time of the UHPC is short, so the manufacturing period is short and the time cost is low.
3. The method conforms to the development trend of the current building field: greenization, rapidness, industrialization and industrialization, and has strong market competitiveness.
4. The structure is simple and light, the mechanical property meets the requirement, the assembly is easy, and the rapid construction of the urban overpass is facilitated.
5. By utilizing the ultrahigh strength, early strength and good durability of UHPC materials, compared with the common concrete solid stair, the overpass stair of the utility model has the advantages that the dead weight is reduced by more than 40 percent, and the overpass stair can be hoisted and installed after being maintained by steam for 48 hours, thereby greatly shortening the construction period; compared with the steel stair, the stair has good durability, and the later maintenance cost is greatly reduced, thereby reducing the cost.
Drawings
Fig. 1 is a perspective view of an urban fabricated overpass staircase using UHPC.
Fig. 2 is a cross-sectional view a-a in fig. 1.
Fig. 3 is a cross-sectional view B-B of fig. 1.
Fig. 4 is a cross-sectional view of C-C in fig. 1.
Wherein, 1 is the step footboard, 2 is the boundary beam, 3 is the center sill, 4 is the bicycle lane, 5 is the pier bent cap, 6 is the bolt, 7 is the rubber asphalt caulking, 8 is ground.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example one
A city assembled overpass stair adopting UHPC comprises a stair unit; the stair unit comprises two side beams, at least one middle beam, a step tread, an upper platform and a lower platform. The two side beams are parallel to each other and are positioned at the left side and the right side, the middle beam is positioned between the two side beams and is parallel to the side beams, the step pedal is positioned between the two side beams and is positioned above the middle beam, the upper end of the step pedal is an upper platform, and the lower end of the step pedal is a lower platform; the stair units are integrally poured into a beam-slab structure through UHPC, reinforcing steel bars are arranged in the upper platform, the lower platform, the side beams and the middle beam, and reinforcing steel bar meshes are arranged in the step treads. The overpass stairs bear additional load effects such as the dead weight of the structure, the load of people and the like after being assembled and fixed by bolts. The bottom surface of the step ladder pedal is provided with at least one middle beam according to the stress requirement.
Hollowing the step ladder pedal, wherein the thickness of the step ladder pedal is 4-5 cm; a single-layer reinforcing mesh is arranged in the step tread. The number of the steps of the step ladder is the same as that of the steps of the standard pedestrian overpass stair sections.
The upper platform is installed on the pier capping beam, bolts are embedded in the pier capping beam, and the upper platform is provided with limiting holes matched with the bolts; the lower platform is installed on the pier capping beam or placed on the ground, when installed on the pier capping beam, bolts are embedded in the pier capping beam in advance, and the lower platform is provided with limiting holes matched with the bolts.
And a plurality of layers of felt are paved between the upper platform and the pier capping beam, and a plurality of layers of felt are paved between the lower platform and the pier capping beam or the ground.
A city assembled overpass stair adopting UHPC comprises two stair units, wherein one stair unit is an ascending stair way, the other stair unit is a descending stair way, and the two stair units are arranged close to each other left and right; the surfaces of the two side beams positioned in the middle are level to form a bicycle lane.
And filling and sealing the gap between the two beams positioned in the middle by using rubber asphalt.
The upper ends of the two side beams positioned in the middle are flush with the upper plane, and the lower ends of the two side beams are flush with the lower plane.
The utility model discloses overline bridge stair, (1) the material adopts super strength concrete UHPC, can solve steel stair corrosion resistance poor, the maintenance cost is high, and ordinary concrete stair dead weight is too big, and is inconvenient to constructions such as transportation, on-the-spot hoist and mount concatenation to and preparation cycle length scheduling problem. (2) Structural style adopts beam slab stair structure, compares ordinary slab stair structure, and is rational in infrastructure, and the bearing capacity has obvious promotion.
Example two
An implementation method of an urban assembled overpass stair adopting UHPC comprises the following steps:
(1) according to the size of the stair sections of the solid bridge, formwork erecting and reinforcing steel bar binding are carried out in a prefabricated factory, the step pedal reinforcing mesh extends into the boundary beam and the middle beam reinforcing skeleton, the stress reinforcing steel bars of the boundary beam and the middle beam and the stress reinforcing steel bars of the upper platform and the lower platform are effectively anchored, the upper stair way and the lower stair way adopt the same set of formwork, the upper stair way and the lower stair way are prefabricated, materials are recycled, and the green construction requirements are met.
(2) And pouring ultra-high performance concrete UHPC, so that the boundary beam, the middle beam and the step tread are poured into an integral beam-slab structure.
(3) And (5) maintaining the stair unit structure, and performing steam maintenance for 48 hours at a high temperature of over 95 ℃.
(4) And transporting the prefabricated staircase units to a site for hoisting and splicing. Installing bolts and paving asphalt felt at corresponding positions of the constructed pier capping beams; the upper and lower stairways are hoisted, so that the limit holes on the stairway units are sleeved in the bolts on the pier capping beams to fix the stairway units, and the lower platform can be fixed without bolts when being grounded. A gap with the width of 1cm is arranged between the upper stair way and the lower stair way, and rubber asphalt is filled in the gap to prevent water seepage and reduce collision damage between the two stair units.
(5) The top surfaces of the side beams leaning together of the ascending stair way and the descending stair way can be used as bicycle paths.
The utility model discloses a stair structure is made at the mill, and the installation is spliced on the scene of building site, and preparation cycle is very short, and the site operation time is fast, and is very little to traffic and environmental impact. Completely meets the requirements of construction rapidness, greenization and industrialization in the field of buildings, particularly municipal engineering. The market application prospect is good, and the competitive advantage is great.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (7)
1. The utility model provides an adopt UHPC's city assembled overpass stair which characterized in that: comprises a stair unit; the stair unit comprises two side beams, at least one middle beam, a step tread, an upper platform and a lower platform; the two side beams are parallel to each other and are positioned at the left side and the right side, the middle beam is positioned between the two side beams and is parallel to the side beams, the step pedal is positioned between the two side beams and is positioned above the middle beam, the upper end of the step pedal is an upper platform, and the lower end of the step pedal is a lower platform; the stair units are integrally poured into a beam-slab structure through UHPC, stressed steel bars are arranged in the upper platform, the lower platform, the side beams and the middle beam, and steel bar meshes are arranged in the step treads.
2. The urban fabricated overpass stair adopting UHPC according to claim 1, characterized in that: the lower part of the step tread is hollowed, the thickness of the step tread is 4-5 cm, and a single-layer reinforcing mesh is arranged.
3. The urban fabricated overpass stair adopting UHPC according to claim 1, characterized in that: the upper platform is installed on the pier capping beam, bolts are embedded in the pier capping beam, and the upper platform is provided with limiting holes matched with the bolts; the lower platform is installed on the pier capping beam or placed on the ground, when installed on the pier capping beam, bolts are embedded in the pier capping beam in advance, and the lower platform is provided with limiting holes matched with the bolts.
4. A city fabricated overpass staircase using UHPC as claimed in claim 3, wherein: and a plurality of layers of felt are paved between the upper platform and the pier capping beam, and a plurality of layers of felt for preventing extrusion and abrasion are paved between the lower platform and the pier capping beam or the ground.
5. A city fabricated overpass staircase using UHPC according to any one of claims 1 to 4, wherein: the two stair units are arranged in a left-right abutting mode; the surfaces of the two side beams positioned in the middle are level to form a bicycle lane.
6. A city fabricated overpass staircase using UHPC according to claim 5, wherein: and a gap with the width of 1cm is arranged between the two side beams positioned in the middle, and rubber asphalt is adopted for filling and sealing.
7. A city fabricated overpass staircase using UHPC according to claim 5, wherein: the upper ends of the two side beams positioned in the middle are flush with the upper plane, and the lower ends of the two side beams are flush with the lower plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922265345.0U CN211547269U (en) | 2019-12-17 | 2019-12-17 | Adopt UHPC's city assembled overpass stair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922265345.0U CN211547269U (en) | 2019-12-17 | 2019-12-17 | Adopt UHPC's city assembled overpass stair |
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| Publication Number | Publication Date |
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| CN211547269U true CN211547269U (en) | 2020-09-22 |
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| CN201922265345.0U Active CN211547269U (en) | 2019-12-17 | 2019-12-17 | Adopt UHPC's city assembled overpass stair |
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