CN108547209B - Single-hole prefabricated hollow slab bridge without expansion joint and construction method thereof - Google Patents
Single-hole prefabricated hollow slab bridge without expansion joint and construction method thereof Download PDFInfo
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- CN108547209B CN108547209B CN201810408319.6A CN201810408319A CN108547209B CN 108547209 B CN108547209 B CN 108547209B CN 201810408319 A CN201810408319 A CN 201810408319A CN 108547209 B CN108547209 B CN 108547209B
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- 238000010276 construction Methods 0.000 title claims abstract description 25
- 239000004575 stone Substances 0.000 claims abstract description 29
- 238000005266 casting Methods 0.000 claims abstract description 14
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 102
- 230000007704 transition Effects 0.000 claims description 51
- 239000004567 concrete Substances 0.000 claims description 41
- 238000011065 in-situ storage Methods 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 239000004568 cement Substances 0.000 claims description 17
- 239000011384 asphalt concrete Substances 0.000 claims description 15
- 239000010426 asphalt Substances 0.000 claims description 13
- 230000002787 reinforcement Effects 0.000 claims description 12
- 239000012791 sliding layer Substances 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 10
- 239000011150 reinforced concrete Substances 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 239000011376 self-consolidating concrete Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 210000001503 joint Anatomy 0.000 description 36
- 201000010099 disease Diseases 0.000 description 5
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000009191 jumping Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
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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
- E01D19/00—Structural or constructional details of 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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Road Paving Structures (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to the technical field of bridge construction, in particular to a single-hole hollow slab expansion joint-free bridge and a construction method thereof, wherein the bridge comprises a bridge abutment, a hollow slab, an end beam and reinforcing steel bars for connecting the hollow slab and the end beam; the abutment comprises a abutment cap and a pile foundation arranged below the abutment cap, a support cushion stone is arranged on the upper surface of the abutment cap, and a rubber cushion layer is arranged on the upper surface of the support cushion stone; the hollow precast slab is arranged on the rubber cushion layer side by side along the transverse bridge direction, a plug board for covering the hollow cavity of the hollow precast slab is arranged on the hollow precast slab, and the plug board is arranged at the end part of the hollow precast slab; the invention has the beneficial effects that: the structure design is simple, the construction method is simple and convenient, the transverse prestress can be applied to the solid part of the midspan part of the hollow slab by casting the transverse bridge at the end cross beam at the end part of the hollow slab, the transverse connection between the hollow slabs is enhanced, and the integrity of the full bridge is improved.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a single-hole prefabricated hollow slab expansion joint-free bridge and a construction method thereof.
Background
The prefabricated hollow slab bridge is one of the most common bridge type bridges of the middle-small span highway bridge in Fujian province, and has large proportion. The traditional prefabricated hollow slab bridge has different degrees of diseases, such as hinge joint damage between prefabricated hollow slabs, single plate stress, support and expansion joint damage and even beam falling and the like, and the problems are more remarkable for the hollow slab bridge with a larger span. According to statistics, nearly 80% of prefabricated hollow slab bridges have the problem of hinge joint concrete damage and serious diseases, single plate stress is caused, the transverse load distribution and the integrity are greatly influenced, the bearing capacity of the prefabricated hollow slab is greatly reduced, the bearing capacity of the hollow slab bridges is greatly reduced, and the problem of large driving safety hidden danger exists. The reason is analyzed mainly because the quality of the prefabricated hollow slab beam is controllable, but the operation space of the cast-in-situ hinge joint is small, the difficulty of cast-in-situ and vibration is high, and the quality is difficult to guarantee.
The single-hole hollow slab bridge is generally provided with expansion joints at bridge decks. However, these expansion joints are susceptible to various diseases due to repeated effects of long-term vehicle loads, atmospheric corrosion and clogging with dust, and require regular maintenance and replacement. The annual maintenance costs for this are remarkable throughout the country, and the indirect losses due to traffic interruption and the like caused by bridge repairs are greater.
Disclosure of Invention
In order to overcome the defects in the prior art, the technical problems to be solved by the invention are as follows: the bridge with the single-hole hollow precast slab and without the expansion joint is simple in structural design and simple and convenient in construction method, transverse prestress can be applied to the solid part of the midspan part of the hollow precast slab by casting the transverse bridge at the end cross beam at the end part of the hollow precast slab, the transverse connection between the hollow precast slabs is enhanced, and the integrity of the full bridge is improved; and optimize the design of the wiring system of the bridge abutment, cancel the expansion joint of the bridge abutment department, realize the integration of road and bridge, have improved durability and travelling comfort of the prefabricated hollow slab bridge of single-hole.
In order to solve the technical problems, the invention adopts the following technical scheme:
a single-hole hollow slab bridge without expansion joints comprises a bridge abutment, a hollow slab, an end beam and reinforcing steel bars for connecting the hollow slab and the end beam;
the abutment comprises a abutment cap and a pile foundation arranged below the abutment cap, a support cushion stone is arranged on the upper surface of the abutment cap, and a rubber cushion layer is arranged on the upper surface of the support cushion stone;
the prefabricated hollow plates are arranged on the rubber cushion layer side by side along the transverse bridge direction, plug plates for covering the hollow cavities of the prefabricated hollow plates are arranged on the prefabricated hollow plates, the prefabricated length of the end parts of the prefabricated hollow plates is smaller than the span length of the prefabricated hollow plates, and a diameter-adding cross beam arranged along the transverse bridge direction is arranged at the span center line position of the prefabricated hollow plates;
one end of the end cross beam is connected with the end part of the precast hollow slab, the end cross beam is arranged on the rubber cushion layer, and the other end of the end cross beam is provided with an EPS slab which is vertically arranged;
the steel bars are horizontally arranged, one ends of the steel bars are inserted into the prefabricated hollow plates and located at positions close to the plug plates, and the other ends of the steel bars are inserted into the end cross beams.
Furthermore, the diameter-increasing cross beam is provided with a prestressed duct penetrating through the diameter-increasing cross beam along the transverse bridge direction, outlets at two ends of the prestressed duct are provided with anchor plates, prestressed steel bars are penetrated in the prestressed duct, and two ends of each prestressed steel bar are respectively connected with the anchor plates.
Further, the upper surface of the prefabricated hollow slab is provided with a concrete pavement layer, the concrete pavement layer is connected with the end cross beam, and the upper surface of the concrete pavement layer is equal to the upper surface of the end cross beam in height.
Further, the cross section of the junction of the end cross beam, the precast hollow slab and the concrete pavement layer along the vertical direction is zigzag.
Further, the system also comprises a post-stage wiring system, wherein the post-stage wiring system comprises a horizontally arranged access board and transition board, a base layer positioned below the access board and the transition board and a post-stage packing layer; one end of the access board is connected with the other end of the end cross beam, the access board is arranged on the upper surface of the EPS board, the upper surface of the access board is equal in height with the upper surface of the end cross beam, the other end of the access board is connected with one end of the transition board, the other end of the transition board is connected with a wiring pavement arranged outside, the base layer comprises a cement stabilized macadam base layer and a graded macadam cushion layer which are arranged up and down, and the post-stage packing layer is arranged below the graded macadam cushion layer.
Further, the butt strap and the end cross beam are connected through steel bars.
Further, the lower surfaces of the butt strap and the transition plate are provided with asphalt sliding layers which are arranged on the upper surface of the cement stabilized macadam base.
Further, the transition plate is made of reinforced concrete with pre-sawn seams, an expansion joint is arranged between the butt strap and the transition plate, and an expansion joint is arranged between the transition plate and the wiring pavement.
Further, the upper surfaces of the concrete pavement layer, the end cross beams, the access boards and the transition boards are provided with asphalt concrete layers, and the upper surfaces of the asphalt concrete layers and the upper surfaces of the external wiring pavements are equal in height.
In order to solve the technical problems, the invention adopts another technical scheme that:
a construction method of a single-hole prefabricated hollow slab bridge without expansion joints comprises the following steps:
step 1, constructing an abutment cap, a pile foundation and a support cushion stone on an abutment, and paving a rubber cushion layer on the support cushion stone to play a role of a support;
step 2, after all the prefabricated hollow slabs are hoisted in place, building a plug slab, casting an end beam in situ, and installing an EPS slab on the end beam;
step 3, after the concrete strength of the cast-in-situ end beam reaches the design strength, forming a concrete pavement layer by adopting a hinge joint between self-compacting concrete cast-in-situ hollow slabs, and taking care of reserving a prestressed duct of the diameter-added beam;
step 4, penetrating prestressed reinforcement in a prestressed duct of the diameter-added beam, and tensioning and anchoring the prestressed reinforcement;
step 5, performing construction of a post-bench wiring system, which specifically comprises performing construction of post-bench soil filling, graded broken stone bedding and a cement stabilized broken stone base layer, wherein an asphalt sliding layer is arranged on the upper surface of the cement stabilized broken stone base layer;
and 6, casting an asphalt concrete layer on the upper surfaces of the concrete pavement layer, the end cross beam, the access board and the transition board in a cast-in-place manner, and paying attention to setting expansion joints.
The invention has the beneficial effects that: the back wall of the traditional bridge abutment is canceled, and the cast-in-situ end cross beam is utilized to replace the back wall for retaining soil; the cast-in-situ end cross beam and the midspan position of the hollow precast slab are provided with the prestressed cable, so that the integrity of the hollow precast slab and the transverse connection between the hollow precast slabs are enhanced, the stress of hinge joints can be improved, and the hinge joints are prevented from being damaged to a certain extent; the rubber cushion layer is arranged on the support cushion stone to play a role of a support; by arranging the plug board, the concrete is prevented from entering the cavity of the prefabricated hollow board; the EPS boards are arranged behind the cast-in-situ end cross beam, and the end cross beam and the hollow precast slab are connected through the steel bars, so that the expansion deformation of the hollow precast slab due to temperature change can be adapted; the single-hole hollow slab bridge without expansion joints has simple structural design and simple construction method, and can strengthen the connection between the hollow slabs and improve the integrity of the full bridge by casting a transverse bridge to an end cross beam at the end part of the hollow slab and applying transverse prestress to the solid part of the midspan part of the hollow slab.
Drawings
FIG. 1 is a schematic structural view of a single-hole hollow slab expansion joint-free bridge according to an embodiment of the present invention;
description of the reference numerals:
1. a bridge abutment; 11. a table cap; 12. pile foundation; 13. a support pad stone; 14. a rubber cushion layer;
2. prefabricating a hollow slab; 21. a blanking plate; 22. a span center line; 23. a diameter-added beam;
231. prestress steel bars; 24. a concrete pavement layer;
3. an end beam; 31. EPS boards;
4. reinforcing steel bars;
5. a post-desk wiring system; 51. a butt strap; 52. a transition plate; 521. expanding joint; 522. pre-sawing;
53. cement stabilized macadam base; 54. grading a crushed stone cushion layer; 55. a packing layer behind the stage; 56. an asphalt slip layer;
6. a wiring road surface; 7. asphalt concrete layer.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
The most critical concept of the invention is as follows: the transverse prestress is applied to the solid part of the midspan part of the hollow precast slab by casting the transverse bridge at the end cross beam at the end part of the hollow precast slab, so that the transverse connection between the hollow precast slabs is enhanced, and the integrity of the full bridge is improved.
Referring to fig. 1, a single-hole hollow slab bridge without expansion joints comprises a bridge abutment 1, a hollow slab 2, an end beam 3 and a reinforcing steel bar 4 for connecting the hollow slab 2 and the end beam 3;
the bridge abutment 1 comprises a abutment cap 11 and a pile foundation 12 arranged below the abutment cap 11, wherein a support cushion stone 13 is arranged on the upper surface of the abutment cap 11, and a rubber cushion layer 14 is arranged on the upper surface of the support cushion stone 13;
the hollow precast slab 2 is arranged on the rubber cushion layer 14 side by side along the transverse bridge direction, a plug slab 21 covering the hollow cavity of the hollow precast slab 2 is arranged on the hollow precast slab 2, the plug slab 21 is arranged at the end part of the hollow precast slab 2, the prefabricated length of the end part of the hollow precast slab 2 is smaller than the span length of the hollow precast slab, and a diameter adding cross beam 23 arranged along the transverse bridge direction is arranged at the position of the span center line 22 of the hollow precast slab 2;
one end of the end cross beam 3 is connected with the end part of the precast hollow slab 2, the end cross beam 3 is arranged on the rubber cushion layer 14, and the other end of the end cross beam 3 is provided with a vertically arranged EPS slab 31;
the steel bars 4 are horizontally arranged, one ends of the steel bars 4 are inserted into the hollow precast slabs 2 and located at positions close to the plug slabs 21, and the other ends of the steel bars 4 are inserted into the end cross beams 3.
From the above description, the single-hole hollow slab bridge without expansion joints has the beneficial effects that:
the back wall of the traditional bridge abutment 1 is eliminated, and the cast-in-situ end cross beam 3 is utilized to replace the back wall for retaining soil; the cast-in-situ end beam 3 and the diameter-adding beam 23 arranged at the midspan position of the hollow precast slab 2 strengthen the integrity of the hollow precast slab 2 and the transverse connection between the hollow precast slabs 2, can improve the stress of hinge joints and prevent the hinge joints from being damaged to a certain extent; the rubber cushion layer 14 is arranged on the support cushion stone 13 to play a role of a support; by arranging the plug board 21, the concrete is prevented from entering the cavity of the precast hollow slab 2; the EPS boards 31 are arranged behind the cast-in-situ end cross beam 3, and the end cross beam 3 and the prefabricated hollow slab 2 are connected through the steel bars 4, so that the expansion deformation of the prefabricated hollow slab 2 due to temperature change can be adapted; the bridge without expansion joints of the single-hole hollow precast slab 2 has simple structural design and simple construction method, and can strengthen the connection between the hollow precast slabs 2 and improve the integrity of the full bridge by casting the transverse bridge at the end part of the hollow precast slab 2 into the end cross beam 3 and applying transverse prestress to the solid part of the midspan part of the hollow precast slab 2.
Further, in the single-hole hollow slab bridge without expansion joints, the diameter-adding beam 23 is provided with a prestressed duct penetrating through the diameter-adding beam 23 along the transverse bridge direction, outlets at two ends of the prestressed duct are provided with anchor plates, prestressed reinforcement 231 is arranged in the prestressed duct in a penetrating manner, and two ends of the prestressed reinforcement 231 are respectively connected with the anchor plates.
As can be seen from the above description, by providing the prestressed duct and penetrating the prestressed reinforcement 231 therein, the prestressed reinforcement 231 is tensioned and anchored by the anchor plate, and the transverse prestress is applied to the hollow precast slabs 2 after the hinge joint is poured, so that the transverse connection between the hollow precast slabs 2 is further enhanced, and the whole bridge is facilitated to be improved.
Further, in the single-hole hollow slab bridge without expansion joints, the upper surface of the hollow slab 2 is provided with the concrete pavement layer 24, the concrete pavement layer 24 is connected with the end cross beam 3, and the upper surface of the concrete pavement layer 24 is equal to the upper surface of the end cross beam 3 in height.
Further, in the single-hole hollow slab bridge without expansion joints, the cross section of the junction of the end cross beam 3, the hollow slab 2 and the concrete pavement layer 24 along the vertical direction is zigzag.
As is apparent from the above description, the end beams 3 can be more tightly coupled to the hollow slab 2 by forming the junctions of the end beams 3 with the hollow slab 2 and the concrete pavement 24 in zigzag shape so as to be better coupled to the post-cast concrete.
Further, in the single-hole prefabricated hollow slab bridge without expansion joints, the bridge further comprises a post-stage wiring system 5, wherein the post-stage wiring system 5 comprises a horizontally arranged access slab 51, a transition slab 52, a base layer positioned below the access slab 51 and the transition slab 52 and a post-stage packing layer 55; one end of the access board 51 is connected with the other end of the end cross beam 3, the access board 51 is arranged on the upper surface of the EPS board 31, the upper surface of the access board 51 is equal in height with the upper surface of the end cross beam 3, the other end of the access board 51 is connected with one end of the transition board 52, the other end of the transition board 52 is connected with the peripheral wiring pavement 6, the base layer comprises a cement stabilized macadam base layer 53 and a graded macadam cushion layer 54 which are arranged up and down, and the post-stage filler layer 55 is arranged below the graded macadam cushion layer 54.
As can be seen from the above description, by arranging the post-stage wiring system 5 behind the cast-in-situ end beam 3, the post-stage wiring system 5, the cast-in-situ end beam 3, the hollow slab 2 and the external wiring pavement 6 are integrated, so that the hollow slab 2 has a certain constraint function, and diseases such as beam falling and the like of the common precast slab under the earthquake action can be avoided.
Further, in the single-hole prefabricated hollow slab bridge without expansion joints, the butt strap 51 and the end cross beam 3 are connected through the reinforcing steel bars 4.
As can be seen from the above description, the cast-in-situ end beam 3 and the access board 51 are connected into a whole through the steel bars 4, so that the expansion joint and the expansion device are eliminated, the phenomenon of bridge head jumping is avoided, and the driving performance of the bridge is improved.
Further, in the single-hole hollow precast slab bridge without expansion joints, asphalt sliding layers 56 are arranged on the lower surfaces of the access slab 51 and the transition slab 52, and the asphalt sliding layers 56 are arranged on the upper surface of the cement stabilized macadam base 53.
As is apparent from the above description, by providing the asphalt slip layer 56 under the access plate 51 and the transition plate 52, the expansion and contraction deformation of the hollow slab 2 due to the temperature change can be accommodated.
Further, in the single-hole hollow precast slab bridge without expansion joints, the transition slab 52 is made of reinforced concrete with pre-sawn slits 522, expansion joints 521 are arranged between the access slab 51 and the transition slab 52, and expansion joints 521 are arranged between the transition slab 52 and the wiring pavement 6.
As can be seen from the above description, the post-stage wiring system 5 can have a strong deformability to adapt to the telescopic deformation of the bent bridge girder by using the reinforced concrete with the pre-sawn slits 522 for the transition plate 52 and providing the expansion slits 521 between the access plate 51 and the transition plate 52 and between the transition plate 52 and the wiring road surface 6.
Further, in the single-hole prefabricated hollow slab bridge without expansion joints, the asphalt concrete layer 7 is arranged on the upper surfaces of the concrete pavement layer 24, the end cross beams 3, the access boards 51 and the transition boards 52, and the upper surfaces of the asphalt concrete layer 7 and the external wiring pavement 6 are equal in height.
As is apparent from the above description, the asphalt concrete layer 7 is laid over the concrete pavement layer 24, the cast-in-place end beam 3, the access board 51 and the transition board 52, so that the cast-in-place end beam 3, the prefabricated hollow board 2, the post-stage wiring system 5 and the external wiring pavement 6 are integrated, and the driving comfort of the pavement vehicle is improved.
Referring to fig. 1, the invention also provides a construction method of the single-hole prefabricated hollow slab bridge without expansion joints, which comprises the following steps:
step 1, constructing a bench cap 11, a pile foundation 12 and a support cushion stone 13 on a bridge abutment 1, and paving a rubber cushion layer 14 on the support cushion stone 13 to play a role of a support;
step 2, after all the prefabricated hollow slabs 2 are hoisted in place, building a plug slab 21, casting an end beam 3 in situ, and installing an EPS slab 31 on the end beam 3;
step 3, after the strength of the concrete of the cast-in-situ end beam 3 reaches the design strength, forming a concrete pavement layer 24 by adopting a hinge joint between the self-compacting concrete cast-in-situ hollow slabs 2, and taking care of reserving a prestressed duct of the diameter-added beam 23;
step 4, penetrating a prestressed reinforcement 231 in a prestressed duct of the diameter-added beam 23, and tensioning and anchoring the prestressed reinforcement 231;
step 5, performing construction of a post-bench wiring system 5, specifically comprising performing construction of post-bench filling, grading macadam bedding 54 and a cement stabilized macadam base 53, and arranging an asphalt sliding layer 56 on the upper surface of the cement stabilized macadam base 53;
and 6, casting an asphalt concrete layer 7 on the upper surfaces of the concrete pavement layer 24, the end cross beams 3, the access boards 51 and the transition boards 52 in a cast-in-place manner, and paying attention to setting expansion joints 521.
Example 1
Referring to fig. 1, a single-hole hollow slab bridge without expansion joints comprises a bridge abutment 1, a hollow slab 2, an end beam 3 and a reinforcing steel bar 4 for connecting the hollow slab 2 and the end beam 3;
the bridge abutment 1 comprises a abutment cap 11 and a pile foundation 12 arranged below the abutment cap 11, wherein a support cushion stone 13 is arranged on the upper surface of the abutment cap 11, and a rubber cushion layer 14 is arranged on the upper surface of the support cushion stone 13;
the hollow precast slab 2 is arranged on the rubber cushion layer 14 side by side along the transverse bridge direction, a plug slab 21 covering the hollow cavity of the hollow precast slab 2 is arranged on the hollow precast slab 2, the plug slab 21 is arranged at the end part of the hollow precast slab 2, the prefabricated length of the end part of the hollow precast slab 2 is smaller than the span length of the hollow precast slab, and a diameter adding cross beam 23 arranged along the transverse bridge direction is arranged at the position of the span center line 22 of the hollow precast slab 2;
one end of the end cross beam 3 is connected with the end part of the precast hollow slab 2, the end cross beam 3 is arranged on the rubber cushion layer 14, and the other end of the end cross beam 3 is provided with a vertically arranged EPS slab 31;
the steel bars 4 are horizontally arranged, one ends of the steel bars 4 are inserted into the hollow precast slabs 2 and positioned close to the plug slabs 21, and the other ends of the steel bars 4 are inserted into the end cross beams 3;
the diameter-adding beam 23 is provided with a prestressed duct penetrating through the diameter-adding beam 23 along the transverse bridge direction, outlets at two ends of the prestressed duct are provided with anchor plates, prestressed steel bars 231 are penetrated in the prestressed duct, and two ends of each prestressed steel bar 231 are respectively connected with the anchor plates;
the upper surface of the precast hollow slab 2 is provided with a concrete pavement layer 24, the concrete pavement layer 24 is connected with the end cross beam 3, and the upper surface of the concrete pavement layer 24 is equal to the upper surface of the end cross beam 3 in height;
the cross section of the junction of the end cross beam 3, the precast hollow slab 2 and the concrete pavement layer 24 along the vertical direction is zigzag.
Example two
Referring to fig. 1, the same structure as the bridge without expansion joints of the single-hole hollow precast slab according to the first embodiment is different in that the bridge without expansion joints of the single-hole hollow precast slab further includes a post-stage wiring system 5, and the post-stage wiring system 5 includes a horizontally arranged access board 51 and a transition board 52, a base layer positioned below the access board 51 and the transition board 52, and a post-stage filler layer 55; one end of the access board 51 is connected with the other end of the end cross beam 3, the access board 51 is arranged on the upper surface of the EPS board 31, the upper surface of the access board 51 is equal to the upper surface of the end cross beam 3 in height, the other end of the access board 51 is connected with one end of the transition board 52, the other end of the transition board 52 is connected with the peripheral wiring pavement 6, the base layer comprises a cement stabilized macadam base layer 53 and a graded macadam cushion layer 54 which are arranged up and down, and the post-stage filler layer 55 is arranged below the graded macadam cushion layer 54;
the butt strap 51 and the end cross beam 3 are connected through the steel bars 4;
the lower surfaces of the access plate 51 and the transition plate 52 are provided with an asphalt sliding layer 56, and the asphalt sliding layer 56 is arranged on the upper surface of the cement stabilized macadam base 53;
the transition plate 52 is made of reinforced concrete with pre-sawn slits 522, an expansion joint 521 is arranged between the access plate 51 and the transition plate 52, and an expansion joint 521 is arranged between the transition plate 52 and the wiring pavement 6;
the upper surfaces of the concrete pavement layer 24, the end cross beams 3, the access boards 51 and the transition boards 52 are provided with asphalt concrete layers 7, and the upper surfaces of the asphalt concrete layers 7 and the upper surfaces of the external wiring pavements 6 are equal in height.
Example III
Referring to fig. 1, the invention also provides a construction method of the single-hole prefabricated hollow slab bridge without expansion joints, which comprises the following steps:
step 1, constructing a bench cap 11, a pile foundation 12 and a support cushion stone 13 on a bridge abutment 1, and paving a rubber cushion layer 14 on the support cushion stone 13 to play a role of a support;
step 2, after all the prefabricated hollow slabs 2 are hoisted in place, building a plug slab 21, casting an end beam 3 in situ, and installing an EPS slab 31 on the end beam 3;
step 3, after the strength of the concrete of the cast-in-situ end beam 3 reaches the design strength, forming a concrete pavement layer 24 by adopting a hinge joint between the self-compacting concrete cast-in-situ hollow slabs 2, and taking care of reserving a prestressed duct of the diameter-added beam 23;
step 4, penetrating a prestressed reinforcement 231 in a prestressed duct of the diameter-added beam 23, and tensioning and anchoring the prestressed reinforcement 231;
step 5, performing construction of a post-bench wiring system 5, specifically comprising performing construction of post-bench filling, grading macadam bedding 54 and a cement stabilized macadam base 53, and arranging an asphalt sliding layer 56 on the upper surface of the cement stabilized macadam base 53;
and 6, casting an asphalt concrete layer 7 on the upper surfaces of the concrete pavement layer 24, the end cross beams 3, the access boards 51 and the transition boards 52 in a cast-in-place manner, and paying attention to setting expansion joints 521.
In summary, the bridge with the single-hole prefabricated hollow slab and the expansion joint-free bridge and the construction method thereof, provided by the invention, cancel the back wall of the traditional bridge abutment and perform soil blocking by replacing the back wall with the cast-in-place end beam; the cast-in-situ end cross beam and the midspan position of the hollow precast slab are provided with the prestressed cable, so that the integrity of the hollow precast slab and the transverse connection between the hollow precast slabs are enhanced, the stress of hinge joints can be improved, and the hinge joints are prevented from being damaged to a certain extent; the rubber cushion layer is arranged on the support cushion stone to play a role of a support; by arranging the plug board, the concrete is prevented from entering the cavity of the prefabricated hollow board; the EPS boards are arranged behind the cast-in-situ end cross beam, and the end cross beam and the hollow precast slab are connected through the steel bars, so that the expansion deformation of the hollow precast slab due to temperature change can be adapted;
the wiring system behind the cast-in-situ end cross beam is arranged, so that the wiring system behind the cast-in-situ end cross beam, the prefabricated hollow slab and the external wiring pavement are integrated, a certain constraint effect is provided for the prefabricated hollow slab, and diseases such as beam falling and the like of the prefabricated slab which are common under the earthquake effect can be avoided.
The cast-in-situ end beam and the butt strap are connected into a whole through the steel bars, an expansion joint and a telescopic device are omitted, the phenomenon of bridge head jumping is avoided, and the driving performance of the bridge is improved.
By arranging the asphalt sliding layer below the butt strap and the transition plate, the telescopic deformation of the prefabricated hollow slab due to temperature change can be adapted.
The transition plate is made of reinforced concrete with pre-sawn seams, and expansion joints are arranged between the butt strap and the transition plate and between the transition plate and a wiring road surface, so that the post-bench wiring system can have stronger deformability so as to adapt to the expansion deformation of the bent bridge girder.
Asphalt concrete layers are paved above the concrete pavement layer, the cast-in-situ end beam, the access board and the transition board, so that the cast-in-situ end beam, the prefabricated hollow board, the post wiring system and the external wiring pavement form a whole, and the driving comfort level of the pavement vehicle is improved.
The single-hole hollow slab bridge without expansion joints has simple structural design and simple construction method, and can strengthen the connection between the hollow slabs and improve the integrity of the full bridge by casting a transverse bridge to an end cross beam at the end part of the hollow slab and applying transverse prestress to the solid part of the midspan part of the hollow slab.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.
Claims (7)
1. The bridge is characterized by comprising a bridge abutment, a prefabricated hollow slab, an end beam and reinforcing steel bars for connecting the prefabricated hollow slab and the end beam;
the abutment comprises a abutment cap and a pile foundation arranged below the abutment cap, a support cushion stone is arranged on the upper surface of the abutment cap, and a rubber cushion layer is arranged on the upper surface of the support cushion stone;
the prefabricated hollow plates are arranged on the rubber cushion layer side by side along the transverse bridge direction, plug plates for covering the hollow cavities of the prefabricated hollow plates are arranged on the prefabricated hollow plates, the prefabricated length of the end parts of the prefabricated hollow plates is smaller than the span length of the prefabricated hollow plates, and a diameter-adding cross beam arranged along the transverse bridge direction is arranged at the span center line position of the prefabricated hollow plates;
one end of the end cross beam is connected with the end part of the precast hollow slab, the end cross beam is arranged on the rubber cushion layer, and the other end of the end cross beam is provided with an EPS slab which is vertically arranged;
the steel bars are horizontally arranged, one ends of the steel bars are inserted into the prefabricated hollow plates and positioned close to the plug plates, and the other ends of the steel bars are inserted into end cross beams;
the diameter-adding beam is provided with a prestressed duct penetrating through the diameter-adding beam along the transverse bridge direction, outlets at two ends of the prestressed duct are provided with anchor plates, prestressed steel bars are penetrated in the prestressed duct, and two ends of each prestressed steel bar are respectively connected with the anchor plates;
the upper surface of the precast hollow slab is provided with a concrete pavement layer, the concrete pavement layer is connected with the end cross beam, and the upper surface of the concrete pavement layer is equal to the upper surface of the end cross beam in height;
the cross section of the junction of the end cross beam, the precast hollow slab and the concrete pavement layer along the vertical direction is zigzag.
2. The single hole hollow slab expansion joint free bridge of claim 1, further comprising a post-stage wiring system comprising horizontally disposed access and transition slabs, a base layer below the access and transition slabs, and a post-stage filler layer; one end of the access board is connected with the other end of the end cross beam, the access board is arranged on the upper surface of the EPS board, the upper surface of the access board is equal in height with the upper surface of the end cross beam, the other end of the access board is connected with one end of the transition board, the other end of the transition board is connected with a wiring pavement arranged outside, the base layer comprises a cement stabilized macadam base layer and a graded macadam cushion layer which are arranged up and down, and the post-stage packing layer is arranged below the graded macadam cushion layer.
3. The single-hole precast hollow slab expansion joint-free bridge of claim 2, wherein the butt slab and the end cross beams are connected by reinforcing steel bars.
4. The single-hole precast hollow slab expansion joint-free bridge according to claim 2, wherein asphalt sliding layers are arranged on the lower surfaces of the access slab and the transition slab and are arranged on the upper surface of the cement stabilized macadam base.
5. The single-hole precast hollow slab expansion joint-free bridge of claim 2, wherein the transition slab is made of reinforced concrete with pre-sawn slits, expansion joints are arranged between the butt slab and the transition slab, and expansion joints are arranged between the transition slab and the wiring pavement.
6. The single-hole precast hollow slab expansion joint-free bridge according to claim 2, wherein the upper surfaces of the concrete pavement layer, the end cross beams, the access slab and the transition slab are provided with asphalt concrete layers, and the upper surfaces of the asphalt concrete layers and the upper surfaces of the external wiring pavement are equal in height.
7. A construction method of a single-hole hollow slab bridge without expansion joints, comprising the single-hole hollow slab bridge without expansion joints according to any one of claims 1 to 6, and the construction method is characterized by comprising the following steps:
step 1, constructing an abutment cap, a pile foundation and a support cushion stone on an abutment, and paving a rubber cushion layer on the support cushion stone to play a role of a support;
step 2, after all the prefabricated hollow slabs are hoisted in place, building a plug slab, casting an end beam in situ, and installing an EPS slab on the end beam;
step 3, after the concrete strength of the cast-in-situ end beam reaches the design strength, forming a concrete pavement layer by adopting a hinge joint between self-compacting concrete cast-in-situ hollow slabs, and taking care of reserving a prestressed duct of the diameter-added beam;
step 4, penetrating prestressed reinforcement in a prestressed duct of the diameter-added beam, and tensioning and anchoring the prestressed reinforcement;
step 5, performing construction of a post-bench wiring system, which specifically comprises performing construction of post-bench soil filling, graded broken stone bedding and a cement stabilized broken stone base layer, wherein an asphalt sliding layer is arranged on the upper surface of the cement stabilized broken stone base layer;
and 6, casting an asphalt concrete layer on the upper surfaces of the concrete pavement layer, the end cross beam, the access board and the transition board in a cast-in-place manner, and paying attention to setting expansion joints.
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| CN201810408319.6A CN108547209B (en) | 2018-05-02 | 2018-05-02 | Single-hole prefabricated hollow slab bridge without expansion joint and construction method thereof |
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| CN201810408319.6A CN108547209B (en) | 2018-05-02 | 2018-05-02 | Single-hole prefabricated hollow slab bridge without expansion joint and construction method thereof |
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| CN108547209B true CN108547209B (en) | 2023-11-21 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110230255A (en) * | 2019-07-22 | 2019-09-13 | 福州大学 | The novel whole bridge corbel back slab of one kind and its construction method |
| CN113605235A (en) * | 2020-07-08 | 2021-11-05 | 苏交科集团股份有限公司 | Composite abutment construction method |
| CN114892498A (en) * | 2022-04-21 | 2022-08-12 | 上海林同炎李国豪土建工程咨询有限公司 | Single-span seamless abutment-free bridge |
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