CN203890851U - Novel prefabricated hollow slab - Google Patents
Novel prefabricated hollow slab Download PDFInfo
- Publication number
- CN203890851U CN203890851U CN201420226210.8U CN201420226210U CN203890851U CN 203890851 U CN203890851 U CN 203890851U CN 201420226210 U CN201420226210 U CN 201420226210U CN 203890851 U CN203890851 U CN 203890851U
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- China
- Prior art keywords
- slab
- hollow slab
- bottom flange
- connecting portion
- bridge
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Abstract
The utility model relates to a novel prefabricated hollow slab, which belongs to the field of bridge engineering. The novel prefabricated hollow slab is an improvement for a conventional hollow slab, and a bottom flange is added; the hollow slab is capable of being prefabricated by a pre-tensioning method, and the prefabricated hollow slab is capable of being provided with a diaphragm plate; after various hollow slabs are arranged on a bridge span, the adjacent hollow slabs are connected at the bottom flanges at first; during construction for the lower connection portions of the adjacent hollow slabs, a worker can stand on bottom flanges to operate, thus ensuring the connection quality; the top of the side web plate of the hollow slab is an upper connection portion, and top plate concrete is poured between the adjacent upper connection portions to form a new cavity; if the hollow slabs prefabricated with the diaphragm plates are used, a transverse prestress is further capable of being tensioned in the diaphragm plate of the whole bridge; after the novel prefabricated hollow slab is used, the cracking problem of the hinge joints of the conventional hollow slab bridge can be avoided.
Description
Technical field
The utility model relates to a kind of novel precast hollow slab, belongs to bridge engineering field.
Background technology
Prefabricated assembled hollow slab bridge, because of its simple structure, stressed clear and definite, easy construction, is one of first-selected bridge type of Short/Medium Span Bridge.At present, this bridge type has become on speedway, arterial highway and has used maximum bridge types, is also the longest bridge type of mileage number.
Although this kind of bridge type has good functional performance, but due to Bridges in Our Country design specifications to the disappearance of hinge seam concrete strength checking computations, construction is upper that concrete the building of hinge seam paid attention to not, cut with scissors and stitch the deficiency of New-old concrete joint surface adhesion strength, the combined influence of the aspect factors such as load action of overloaded vehicle, be prone to along the longitudinal crack of hinge seam, this is confirmed by the bridge defect inquiry agency of domestic various places.The infiltration of rainwater can aggravate the impact of crack on the globality of beam body and rigidity.Under the repeated action of overloaded vehicle, hinge seam very easily lost efficacy, and then occurred " veneer is stressed " phenomenon.Domestic only just had 5 hollow slab bridges to occur collapse accident in 2011.
By studying and thinking deeply, people recognize gradually, and hollowcore slab hinge seam stressed mainly comprises that shearing and transverse bending moment between plate, cracking are generally hinge seam bottom crackings in advance under the effect of transverse bending moment.The horizontal resistance to tension that increases hinge seam bottom is almost the problem that all hollow slab bridges are reinforced or precast hollow slab need to solve, people start to guarantee from structure the reliability laterally connecting gradually, normal by increasing diaphragm and applying the transverse integral that transverse prestress increases bridge in design.
Increase diaphragm and bring inconvenience to construction, apply transverse prestress except increasing construction operation amount, also affect sight and the under-clearance of bridge.Narrow and small seam bottom, almost can not be for taking other laterally to connect space is provided reliably.
Summary of the invention
The utility model is the defect that overcomes prior art, a kind of novel precast hollow slab is provided, this hollowcore slab profile is that conventional hollowcore slab has increased bottom flange, while adopting the assembled hollow slab bridge of this hollowcore slab, the end, bottom flange of adjacent vacant core is lower connecting portion, the top of hollow slab edge web is upper connecting portion, forms new cavity after pouring into a mould concrete roof between adjacent upper connecting portion.Adopt its assembled hollow slab bridge to cancel hinge seam, the seaming position of adjacent vacant core is different from conventional hollowcore slab.The seam of adjacent panel is entirely in web position, also no longer upper and lower perforation, but be divided into top board seam and the base plate seam staggering, and top board seam is near web top, and base plate seam is in end, bottom flange.Adjacent vacant core lifting is spelled and is placed on after assigned position, and workman can operation on bottom flange, connects bottom flange, after the top board cast-in-situ concrete between the seam of cast top, forms a new cavity.
The bottom flange of described precast hollow slab connects can build high-tensile concrete or mortar connection, also can with bolts or welding.Corner above the cross section of hollowcore slab bottom flange, can pre-buried angle steel, during assembled hollow slab bridge, the relative angle steel side weld in adjacent bottom flange connects, another side connects with fillet welding after adding a cover a junction steel plate, also can on this limit, weld the steel plate in strap bolt hole, with bolt, connects.
The upper connecting portion construction joint of described precast hollow slab is tilted to place hollowcore slab, so that cast-in-place concrete roof end pressure is thereon, and the extended limit of upper connecting portion web outside face, upper connecting portion has the level connection joint muscle crossing out.
The hollowcore slab bottom wing listrium of described precast hollow slab connects built-in fitting used longitudinally to be arranged, the closer to span centre, spacing is less, and there is the level connection joint muscle crossing out bottom flange.
The hollowcore slab cavity of described precast hollow slab can be rectangle, the one-sided double nut that adopts of connecting bolt.
The casting top slab of described precast hollow slab and deck paving can once-casts.
Described precast hollow slab can adopt pre-tensioning system prefabricated, can precast hollow slab have a diaphragm, assembled and connect the after-applied transverse prestress of corresponding diaphragm.
Described end, precast hollow slab bottom flange can be embedded with prestressed pore passage, and anchoring tooth piece is near hollowcore slab end, and lower connecting portion concreting applies longitudinal prestressing after connecting.
The beneficial effects of the utility model are: owing to having adopted novel precast hollow slab, the connection of adjacent panel is divided into upper connection and the lower connection of staggering, and have cancelled hinge seam.During lower connection construction, workman can stand on bottom wing listrium, and construction quality is guaranteed.Adopt the assembled hollow slab bridge of hollow sheet, guaranteed, laterally not ftractureing under flexural tensile stress effect, to have solved the problem that always perplexs hollow slab bridge.The making of new precast beam can utilize existing template, does not increase investment, has increased the durability connecting, and can reduce the maintenance of bridge, saves social resources.
Accompanying drawing explanation
Fig. 1 hollow sheet schematic diagram;
Fig. 2 adopts the assembled hollow slab bridge schematic cross-sectional view of hollow sheet;
Fig. 3 weld seam connects local section schematic diagram;
Fig. 4 circular cavity hollowcore slab schematic cross-sectional view;
The two nose circle rectangular enclosure hollowcore slab schematic cross-sectional view of Fig. 5;
Fig. 6 door shape cavity hollowcore slab schematic cross-sectional view;
The top end hollowcore slab schematic diagram of web inner side outside in connecting portion place on Fig. 7;
The hollowcore slab schematic diagram of reserved prestressed pore passage in Fig. 8 bottom flange.
In figure, mark: 1. top board, 2. web, 3. base plate, 4. bottom flange, 5. outside lower chamfering, 6. outside upper chamfering, 7. cavity, 8. interior lower chamfering, 9. interior upper chamfering, 10. angle steel, 11. junction steel plates, 12. top board dowels, 15. asphalt surface courses, water top board after 16., 17. deck pavings, 18. butt welds, 19. fillet welds, 23. tooth pieces, 24. prestressed pore passages, the 25. horizontal dowels in bottom flange.
The specific embodiment
First embodiment of the present utility model is novel precast hollow slab as shown in Figure 1, shape has increased bottom flange (4) as conventional hollowcore slab, and other form and also comprise top board (1), web (2), base plate (3), outside lower chamfering (5), outside upper chamfering (6), cavity (7), interior lower chamfering (8), interior upper chamfering (9), pre-buried angle steel (10) and top board dowel (12).While adopting the assembled hollow slab bridge of this precast hollow slab, after each hollowcore slab is lifted in spanning side by side, in bottom flange, (4) adopt weld seam to connect to adjacent vacant core: first use butt weld (18) to connect the relative angle steel limit on the adjacent edge of a wing, on two adjacent angle steel, place again junction steel plate (11), and weld by fillet weld (19).The top of hollow slab edge web (2) is upper connecting portion, the construction joint of upper connecting portion is tilted to place hollowcore slab, places after permanent roof plate template, adjusts top board dowel (12), colligation top board longitudinal reinforcement, cast concrete roof forms a new cavity.After concrete roof intensity reaches 90%, cast deck paving (17), after concrete strength reaches 90%, constructing anti-collision wall and asphalt surface course (15).
Second embodiment of the present utility model improves first embodiment, hollow sheet bottom flange lateral surface is at the pre-buried angle steel of same area longitudinally, the steel plate in angle steel upper surface welding strap bolt hole, during assembled hollow slab bridge, the relative angle steel side weld in adjacent bottom flange connects, then uses the steel plate on bolt connecting angle.
The 3rd embodiment of the present utility model improves first embodiment, and hollowcore slab bottom flange (4) have the horizontal dowel in the bottom flange crossing out (25), and the cast-in-place connection of bottom flange adopts fibrous concrete or the mortar of high tensile performance.
The 4th embodiment of the present utility model improves first embodiment, and when hollowcore slab is assembled, casting top slab and deck paving can once-casts.
The 5th embodiment of the present utility model improves first embodiment, and the upper connecting portion of the hollowcore slab adopting, as Fig. 5 and Fig. 6, stretches out limit web outside face.
The 6th embodiment of the present utility model improves first embodiment, hollowcore slab is prefabricated with diaphragm, when assembled hollow slab bridge, colligation diaphragm connecting reinforcement, concreting connects each diaphragm, form the diaphragm (or being called diaphragm) of hollow slab bridge, stretch-draw transverse prestress in diaphragm.
The 7th embodiment of the present utility model improves first embodiment, and as shown in Figure 7, upper connecting portion top end is web inner side outside for precast hollow slab, and leaving certain gaps uncovered by the economic plan on hollowcore slab inner chamber, is convenient to remove inner template.Prefabricated top plate portion is thicker, no longer needs to pour into a mould bridge deck pavement after setting up.The barbed portion of staying is interior upper chamfering (9), lays permanent template before cast-in-site top board.
The 8th embodiment of the present utility model improves the 3rd embodiment, precast hollow slab as shown in Figure 8, lower connecting portion has the horizontal dowel in bottom flange (25), bottom flange (4) is reserved with prestressed pore passage (24) longitudinally, and the tooth piece (23) that anchoring is used is near the longitudinal end of hollowcore slab, and ground tackle adopts flat anchor, lower connecting portion concreting connects, after concrete strength reaches its normal intensity 90%, steel strand in prestressed pore passage (24), tension steel strand anchoring, mud jacking.The crack resistance of the concrete connecting band that this measure is watered after can increasing.
Claims (8)
1. a novel precast hollow slab, it is characterized in that: this hollowcore slab profile is that conventional hollowcore slab has increased bottom flange, lower connecting portion when this bottom flange is assembled hollow slab bridge, corresponding upper connecting portion is at the top of limit web, forms new cavity after pouring into a mould concrete roof between adjacent upper connecting portion.
2. novel precast hollow slab as claimed in claim 1, is characterized in that: there is the level connection joint muscle crossing out hollowcore slab bottom flange, and cast-in-place connection adopts fibrous concrete or the mortar of high tensile performance.
3. novel precast hollow slab as claimed in claim 1, it is characterized in that: corner above the cross section of hollowcore slab bottom flange, is embedded with angle steel, during assembled hollow slab bridge, the relative angle steel side weld in adjacent bottom flange connects, and another side connects with fillet welding after adding a cover a junction steel plate.
4. novel precast hollow slab as claimed in claim 1, is characterized in that: the upper connecting portion of hollowcore slab has the level connection joint muscle crossing out.
5. novel precast hollow slab as claimed in claim 1, is characterized in that: the reserved construction joint of the upper connecting portion of hollowcore slab is tilted to place hollowcore slab, so that cast-in-place concrete roof end can be pressed thereon.
6. novel precast hollow slab as claimed in claim 5, is characterized in that: on hollowcore slab, connecting portion stretches out limit web outside face.
7. novel precast hollow slab as claimed in claim 1, is characterized in that: bottom flange is reserved with longitudinal prestressing duct, and anchoring tooth piece is near hollowcore slab end, and lower connecting portion concreting applies longitudinal prestressing after connecting.
8. novel precast hollow slab as claimed in claim 1, it is characterized in that: corner above the cross section of hollowcore slab bottom flange, be embedded with angle steel, the steel plate in angle steel upper surface welding strap bolt hole, during assembled hollow slab bridge, the relative angle steel side weld in adjacent bottom flange connects, then uses the steel plate on bolt connecting angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420226210.8U CN203890851U (en) | 2014-05-06 | 2014-05-06 | Novel prefabricated hollow slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420226210.8U CN203890851U (en) | 2014-05-06 | 2014-05-06 | Novel prefabricated hollow slab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203890851U true CN203890851U (en) | 2014-10-22 |
Family
ID=51717273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420226210.8U Expired - Fee Related CN203890851U (en) | 2014-05-06 | 2014-05-06 | Novel prefabricated hollow slab |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203890851U (en) |
-
2014
- 2014-05-06 CN CN201420226210.8U patent/CN203890851U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141022 Termination date: 20170506 |