CN111206500A - Structure and method for improving crack resistance of simply supported-then-continuous bridge deck slab - Google Patents
Structure and method for improving crack resistance of simply supported-then-continuous bridge deck slab Download PDFInfo
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- CN111206500A CN111206500A CN202010123286.8A CN202010123286A CN111206500A CN 111206500 A CN111206500 A CN 111206500A CN 202010123286 A CN202010123286 A CN 202010123286A CN 111206500 A CN111206500 A CN 111206500A
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- bridge
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- 238000000034 method Methods 0.000 title abstract description 5
- 239000004567 concrete Substances 0.000 claims abstract description 127
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 238000002955 isolation Methods 0.000 claims abstract description 20
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 14
- 125000006850 spacer group Chemical group 0.000 claims description 24
- 238000010276 construction Methods 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 10
- 239000004698 Polyethylene Substances 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 229920003023 plastic Polymers 0.000 claims description 8
- -1 polyethylene Polymers 0.000 claims description 8
- 229920000573 polyethylene Polymers 0.000 claims description 8
- 239000011374 ultra-high-performance concrete Substances 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims 7
- 239000011178 precast concrete Substances 0.000 description 25
- 239000000463 material Substances 0.000 description 13
- 230000008878 coupling Effects 0.000 description 9
- 238000010168 coupling process Methods 0.000 description 9
- 238000005859 coupling reaction Methods 0.000 description 9
- 230000003014 reinforcing effect Effects 0.000 description 7
- 230000002787 reinforcement Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005304 joining Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000004574 high-performance concrete Substances 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/40—Plastics
Abstract
The invention discloses a structure and a method for improving the crack resistance of a simply supported bridge deck slab and a continuous bridge deck slab, wherein the structure comprises the following steps: a bridge pier; the precast beam is erected on the bridge pier; the cast-in-place concrete bridge deck is formed on the precast beam in a pouring mode, and bridge deck steel bars extending along the longitudinal direction are embedded in the cast-in-place concrete bridge deck; the isolation piece is embedded in the cast-in-place concrete bridge deck and wraps the outer side of the bridge deck reinforcing steel bars, and the isolation piece is positioned right above the bridge pier, wherein the elastic modulus of the isolation piece is lower than that of concrete of the cast-in-place concrete bridge deck; and the bridge deck pavement layer is laid on the cast-in-place concrete bridge deck. According to the structure for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge, the crack resistance of the bridge deck slab of the simply supported and continuous bridge can be effectively improved.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a structure for improving the crack resistance of a simply supported and then continuous bridge deck and a construction method thereof.
Background
In order to improve the driving comfort, the bridge is required to have good mechanical property and less expansion joint structures so as to obtain better smoothness, so that the bridge structure which is simply supported and then continuous and the matched construction method thereof are widely applied. In the traditional bridge deck structure of simply supported and then continuous bridge, the tensile stress of the tension area of the concrete bridge deck is not easy to control, and the concrete bridge deck has poor crack resistance and is easy to crack.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a structure for improving the crack resistance of a deck slab of a simply supported and then continuous bridge, wherein the cast-in-place concrete deck slab of the structure for improving the crack resistance of the deck slab of the simply supported and then continuous bridge has good crack resistance and is not easy to crack.
The invention further provides a construction method of the structure for improving the crack resistance of the simply supported-to-continuous bridge deck slab.
According to the structure for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge, which is disclosed by the embodiment of the first aspect of the invention, the structure comprises: a bridge pier; the precast beam is erected on the bridge pier; the cast-in-place concrete bridge deck is formed on the precast beam in a pouring mode, and bridge deck steel bars extending along the longitudinal direction are embedded in the cast-in-place concrete bridge deck; the isolation piece is embedded in the cast-in-place concrete bridge deck and wraps the outer side of the bridge deck reinforcing steel bars, and the isolation piece is positioned right above the bridge pier, wherein the elastic modulus of the isolation piece is lower than that of concrete of the cast-in-place concrete bridge deck; and the bridge deck pavement layer is laid on the cast-in-place concrete bridge deck.
According to the structure for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge, disclosed by the embodiment of the invention, the cast-in-place concrete bridge deck slab is good in crack resistance and not easy to crack.
In addition, the structure for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge according to the embodiment of the invention can also have the following additional technical characteristics:
according to one embodiment of the present invention, a vertical centerline of the spacer overlaps a vertical centerline of the pier, and a longitudinal length of the spacer is not less than a longitudinal length of the pier.
According to one embodiment of the invention, the spacer is a rubber or polyethylene plastic part.
According to one embodiment of the invention, the cast-in-place concrete bridge deck comprises a first cast-in-place concrete bridge deck section and second cast-in-place concrete bridge deck sections arranged on both sides of the first cast-in-place concrete bridge deck section, the insulation member being embedded in the first cast-in-place concrete bridge deck section, the tensile strength of the concrete of the first cast-in-place concrete bridge deck section being higher than the tensile strength of the concrete of the second cast-in-place concrete bridge deck section.
According to one embodiment of the invention, the first cast-in-place concrete bridge deck section is formed from ECC concrete casting or from UHPC concrete casting.
According to one embodiment of the invention, the spacer is configured as a sleeve, and an opening is provided in a wall of the sleeve, the opening extending in an axial direction of the sleeve and extending through the sleeve in the axial direction, the sleeve being adapted to be fastened to an outer side of the bridge deck steel bar through the opening.
According to one embodiment of the present invention, the spacer includes a first sub spacer and a second sub spacer formed in an arc shape, the first sub spacer and the second sub spacer are disposed at an outer side of the bridge deck reinforcing bar, and the first sub spacer and the second sub spacer are connected to form a sleeve by splicing.
According to one embodiment of the invention, the spacer is formed as a flexible membrane wrapped around the outside of the decking rebar.
According to the second aspect of the present invention, the construction method of the structure for improving the crack resistance of the deck slab of the simply supported and then continuous bridge is used for building the structure for improving the crack resistance of the deck slab of the simply supported and then continuous bridge according to the first aspect of the present invention, and the construction method comprises the following steps:
s01: erecting the prefabricated beam on the bridge pier;
s02: erecting the bridge deck steel bars and a template for pouring to form the cast-in-place concrete bridge deck on the precast beam, wrapping the isolating pieces on the outer sides of the bridge deck steel bars, and then pouring concrete to form the cast-in-place concrete bridge deck;
s03: and paving the bridge deck pavement layer on the cast-in-place concrete bridge deck slab.
According to the construction method for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge, the crack resistance of the tensile area of the cast-in-place concrete bridge deck slab of the structure which is formed by building through the construction method and improves the crack resistance of the bridge deck slab of the simply supported and continuous bridge is good.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a structure for improving crack resistance of a simply supported bridge deck slab and a continuous bridge deck slab according to an embodiment of the invention;
fig. 2 is a sectional view taken along line a-a of the structure for improving crack resistance of a simply supported and then continuous bridge deck shown in fig. 1.
Reference numerals:
the structure 100 for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge is improved;
a pier 1;
prefabricating a beam 2; a first precast concrete beam 21; a second precast concrete beam 22; a cast-in-place concrete joining section 23;
cast-in-place concrete decking 3; bridge deck reinforcements 31;
a spacer 4;
and a bridge deck pavement layer 5.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A structure 100 for improving crack resistance of a simply supported and then continuous bridge deck slab according to an embodiment of the first aspect of the present invention will be described with reference to fig. 1 to 2.
Referring to fig. 1 to 2, a structure 100 for improving crack resistance of a deck slab of a simply supported and then continuous bridge according to an embodiment of the present invention includes: the bridge comprises piers 1, precast beams 2, cast-in-place concrete bridge decks 3, isolating pieces 4 and a bridge deck pavement layer 5.
The precast beam 2 is erected on the pier 1, the cast-in-place concrete bridge deck 3 is formed on the precast beam 2 in a pouring mode, the cast-in-place concrete bridge deck 3 is embedded with bridge deck reinforcing steel bars 31 extending along the longitudinal direction (the left and right directions shown in the figure 1), the isolating piece 4 is embedded in the cast-in-place concrete bridge deck 3 and wraps the bridge deck reinforcing steel bars 31, the isolating piece 4 is located right above the pier 1, the elastic modulus of the isolating piece 4 is lower than that of concrete of the cast-in-place concrete bridge deck 3, and the bridge deck pavement layer 5 is laid on the cast-in-place concrete bridge deck 3.
Through the outside parcel separator 4 at decking reinforcing bar 31, and separator 4 is located pier 1 directly over, thereby destroy the bonding effect of this department separator 4 and cast in situ concrete decking 3 interface department, the bonding effect between the local release decking reinforcing bar 31 of key position and the concrete, will originally be transferred to the decking reinforcing bar 31 by the pulling force that concrete and decking reinforcing bar 31 born jointly on, the tensile stress of cast in situ concrete decking 3 has been reduced by a wide margin, thereby the anti-cracking performance of cast in situ concrete decking 3 has been improved.
The isolating pieces 4 are low in price, suitable for batch production in factories, free of additional processes in the construction stage and only required to be buckled on the bridge deck steel bars 31, and engineering quality is easy to guarantee.
According to the structure 100 for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge, the bonding action between the bridge deck slab reinforcing steel bars 31 and the cast-in-place concrete bridge deck slab 3 is locally released through the new ideas of 'anti-release combination' and 'best use of things' so as to reduce the tensile stress of the cast-in-place concrete bridge deck slab 3, the crack resistance of the tensile region of the cast-in-place concrete bridge deck slab 3 of the structure 100 for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge is improved, the construction is convenient, and the structure has remarkable technical and economic benefits.
In one embodiment of the present invention, as shown in fig. 1, the vertical center line of the spacer 4 overlaps the vertical center line of the pier 1, and the longitudinal length of the spacer 4 is not less than that of the pier 1, whereby the crack resistance of the tension region of the cast-in-place concrete decking 3 of the structure 100 for improving the crack resistance of the deck slab of the simply-supported-then-continuous bridge can be more improved.
In an alternative embodiment of the invention, the spacer 4 is a rubber member, i.e. the spacer 4 is manufactured from a rubber material having a substantially lower modulus of elasticity than the concrete material.
In another alternative embodiment of the present invention, the isolation member 4 is made of polyethylene plastic, that is, the isolation member 4 is made of polyethylene plastic material, and the modulus of elasticity of the polyethylene plastic material is much lower than that of the concrete material.
In one embodiment of the invention, the spacer 4 is configured as a sleeve, the wall of which is provided with an opening extending in the axial direction of the sleeve and extending through the sleeve in the axial direction, the sleeve being adapted to be fastened to the outside of the decking reinforcement 31 through the opening. Therefore, the isolation piece 4 is simple in structure, and the isolation piece 4 is conveniently installed on the outer side of the bridge deck steel bar 31.
In one embodiment of the present invention, the spacer 4 includes a first sub-spacer and a second sub-spacer formed in an arc shape, both of which are disposed outside the bridge deck reinforcing bars 31, and the first sub-spacer and the second sub-spacer are connected to form a sleeve by splicing. Therefore, the isolation piece 4 is simple in structure, and the isolation piece 4 is conveniently installed on the outer side of the bridge deck steel bar 31.
In one embodiment of the invention, the spacers 4 are formed as flexible membranes that wrap around the outside of the decking reinforcing bars 31. Therefore, the isolation piece 4 is simple in structure, and the isolation piece 4 is conveniently installed on the outer side of the bridge deck steel bar 31.
In one embodiment of the invention, the cast-in-place concrete bridge deck 3 comprises a first cast-in-place concrete bridge deck section and second cast-in-place concrete bridge deck sections disposed on either side of the first cast-in-place concrete bridge deck section, and the spacer 4 is embedded in the first cast-in-place concrete bridge deck section, the tensile strength of the concrete of the first cast-in-place concrete bridge deck section being higher than the tensile strength of the concrete of the second cast-in-place concrete bridge deck section. The first cast-in-place concrete bridge deck section may be formed from a high performance concrete pour and the second cast-in-place concrete bridge deck section may be formed from a common concrete pour. This ensures that the costs are not too high, while the crack resistance of the tension zone of the cast-in-place concrete deck slab 3 is further improved. Optionally, the first cast-in-place concrete bridge deck section is formed from ECC concrete casting or from UHPC concrete casting.
The precast girders 2 may include only one precast concrete beam, which is erected on the pier 1, and the precast girders 2 may include two precast concrete beams, for example, in the specific example shown in fig. 1, the precast girders 2 include a first precast concrete beam 21, a second precast concrete beam 22, a cast-in-place concrete coupling section 23, and a coupling section bushing (not shown), the first and second precast concrete beams 21 and 22 each extend in a longitudinal direction, and the first and second precast concrete beams 21 and 22 are arranged in a longitudinally spaced-apart manner, ends of the first and second precast concrete beams 21 and 22 adjacent to each other are erected on the pier 1, a tension region of the first precast concrete beam 21 is provided with first stress reinforcement (not shown), an end of the first stress reinforcement adjacent to the second precast concrete beam 22 protrudes out of an end of the first precast concrete beam 21 to form a first stress reinforcement overhanging section, a second stressed steel bar (not shown) is arranged in a tension area of the second precast concrete beam 22, one end, adjacent to the first precast concrete beam 21, of the second stressed steel bar extends out of the end of the second precast concrete beam 22 to form a second stressed steel bar overhanging section, and the first stressed steel bar overhanging section and the second stressed steel bar overhanging section are connected to form a multi-span simply supported stressed system. The cast-in-place concrete joint section 23 is arranged on the pier 1 and is formed between the first precast concrete beam 21 and the second precast concrete beam 22 in a pouring mode, the joint section sleeve is wrapped on the outer sides of the first stress steel bar extending section and the second stress steel bar extending section, the first stress steel bar extending section, the second stress steel bar extending section and the joint section sleeve are embedded in the cast-in-place concrete joint section 23, and the elastic modulus of the joint section sleeve is lower than that of concrete of the cast-in-place concrete joint section 23.
The cast-in-place concrete joining section 23 functions to connect the first precast concrete beam 21 and the second precast concrete beam 22, and realizes a system conversion from simple support to continuous. The outside of the first stress reinforcing steel bar extending section and the second stress reinforcing steel bar extending section comprises the joint section sleeve, the bonding effect of the joint interface of the first stress reinforcing steel bar extending section and the second stress reinforcing steel bar extending section and the cast-in-place concrete joint section 23 can be damaged, the bonding between the reinforcing steel bars and the concrete is locally released at the key position, the pulling force born by the concrete and the reinforcing steel bars together is transferred to the reinforcing steel bars, the tensile stress of the cast-in-place concrete joint section 23 in the hogging moment area is greatly reduced, and the crack resistance of the pulled area of the cast-in-place concrete joint section 23 is improved.
The casing pipe at the combining section is low in price, is suitable for batch production in factories, does not need additional working procedures in the construction stage, only needs to be buckled on the tension steel bar of the cast-in-place concrete combining section 23, and is easy to ensure the engineering quality.
Through the new ideas of 'anti-release combination' and 'making the best of things', the bonding force between the steel bars in the tension area and the cast-in-place concrete combining section 23 is locally released to reduce the tensile stress in the concrete of the cast-in-place concrete combining section 23, the crack resistance of the tension area of the cast-in-place concrete combining section 23 is improved, and the construction is convenient and the cost is low.
In an alternative embodiment of the present invention, the casing of the coupling section is a rubber member, that is, the casing of the coupling section is made of a rubber material, and the elastic modulus of the rubber material is much lower than that of the concrete material.
In another alternative embodiment of the present invention, the coupling-section bushing is made of polyethylene plastic, that is, the coupling-section bushing is made of polyethylene plastic material, and the modulus of elasticity of the polyethylene plastic material is much lower than that of the concrete material.
Preferably, the cast-in-place concrete coupling section 23 is formed using high performance concrete, which means concrete having a tensile strength higher than that of general concrete, for example, the cast-in-place concrete coupling section 23 is formed by ECC concrete casting or the cast-in-place concrete coupling section 23 is formed by UHPC concrete casting. The tensile strength of the cast-in-place concrete joining section 23 can be further improved by forming the cast-in-place concrete joining section 23 by casting high-performance concrete.
A construction method of a structure 100 for improving crack resistance of a deck slab of a bridge after a simple support according to a second aspect of the present invention is used for constructing the structure 100 for improving crack resistance of a deck slab of a bridge after a simple support according to the first aspect of the present invention, and the construction method includes the following steps:
s01: erecting a precast beam 2 on the pier 1;
s02: erecting bridge deck steel bars 31 and a template for pouring to form a cast-in-place concrete bridge deck 3 on the precast beam 2, wrapping a spacer 4 outside the bridge deck steel bars 31, and then pouring concrete to form the cast-in-place concrete bridge deck 3;
s03: and paving a bridge deck pavement layer 5 on the cast-in-place concrete bridge deck slab 3.
According to the construction method of the structure 100 for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge, which is disclosed by the embodiment of the invention, the crack resistance of the tensile area of the cast-in-place concrete bridge deck slab 3 of the structure 100 for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge formed by construction by adopting the construction method is good.
Further, when the precast beam 2 includes the first precast concrete beam 21 and the second precast concrete beam 22 in the above embodiment, the step S01 specifically includes the following steps:
s011: erecting a first precast concrete beam 21 and a second precast concrete beam 22 on the pier 1;
s012: connecting the first stressed steel bar overhanging section and the second stressed steel bar overhanging section together to form a multi-span simply-supported stressed system;
s013: wrapping a joint section sleeve on the outer sides of the first stressed steel bar overhanging section and the second stressed steel bar overhanging section so as to destroy the bonding effect of a connecting interface of the steel bars and the cast-in-place concrete joint section 23;
s014: a formwork for casting to form the cast-in-place concrete coupling section 23 is installed between the first precast concrete beam 21 and the second precast concrete beam 22, and concrete is cast to form the cast-in-place concrete coupling section 23, completing the system conversion from simple to continuous.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. The utility model provides a promote structure of first simply supported back continuous bridge decking crack resistance ability which characterized in that includes:
a bridge pier;
the precast beam is erected on the bridge pier;
the cast-in-place concrete bridge deck is formed on the precast beam in a pouring mode, and bridge deck steel bars extending along the longitudinal direction are embedded in the cast-in-place concrete bridge deck;
the isolation piece is embedded in the cast-in-place concrete bridge deck and wraps the outer side of the bridge deck reinforcing steel bars, and the isolation piece is positioned right above the bridge pier, wherein the elastic modulus of the isolation piece is lower than that of concrete of the cast-in-place concrete bridge deck;
and the bridge deck pavement layer is laid on the cast-in-place concrete bridge deck.
2. The structure for improving the crack resistance of a simply supported and then continuous bridge deck slab as claimed in claim 1, wherein the vertical center line of the spacer is overlapped with the vertical center line of the pier, and the longitudinal length of the spacer is not less than that of the pier.
3. The structure for improving the crack resistance of a bridge deck slab of a simply supported and then continuous bridge as claimed in claim 1, wherein the isolation member is a rubber member or a polyethylene plastic member.
4. The structure for improving the crack resistance of a simply supported and then continuous bridge deck slab as claimed in claim 1, wherein the cast-in-place concrete bridge deck slab comprises a first cast-in-place concrete bridge deck slab section and second cast-in-place concrete bridge deck slab sections arranged on two sides of the first cast-in-place concrete bridge deck slab section, the separator is embedded in the first cast-in-place concrete bridge deck slab section, and the tensile strength of the concrete of the first cast-in-place concrete bridge deck slab section is higher than that of the concrete of the second cast-in-place concrete bridge deck slab section.
5. The structure for improving the crack resistance of a simply supported and then continuous bridge deck slab of claim 4, wherein the first cast-in-place concrete deck slab section is formed by ECC concrete casting or UHPC concrete casting.
6. The structure for improving the crack resistance of a simply supported and then continuous bridge deck slab as claimed in claim 1, wherein the isolation member is configured as a sleeve, an opening is provided on the wall of the sleeve, the opening extends along the axial direction of the sleeve and axially penetrates through the sleeve, and the sleeve is suitable for being buckled on the outer side of the deck slab steel bar through the opening.
7. The structure for improving the crack resistance of a bridge deck slab of a simply supported and then continuous bridge as claimed in claim 1, wherein the partition comprises a first sub partition and a second sub partition formed in an arc shape, the first sub partition and the second sub partition are both arranged on the outer side of the reinforcing steel bars of the bridge deck slab, and the first sub partition and the second sub partition are connected to form a sleeve in a splicing manner.
8. The structure for improving the crack resistance of a simply supported and then continuous bridge deck slab as claimed in claim 1, wherein the isolation member is formed as a flexible film, and the flexible film is wrapped on the outer side of the deck slab steel bar.
9. A construction method of a structure for improving the crack resistance of a bridge deck slab of a simply supported and continuous bridge, which is characterized in that the structure for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge is the structure for improving the crack resistance of the bridge deck slab of the simply supported and continuous bridge according to any one of claims 1 to 8, and the construction method comprises the following steps:
s01: erecting the prefabricated beam on the bridge pier;
s02: erecting the bridge deck steel bars and a template for pouring to form the cast-in-place concrete bridge deck on the precast beam, wrapping the isolating pieces on the outer sides of the bridge deck steel bars, and then pouring concrete to form the cast-in-place concrete bridge deck;
s03: and paving the bridge deck pavement layer on the cast-in-place concrete bridge deck slab.
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| CN202010123286.8A CN111206500A (en) | 2020-02-27 | 2020-02-27 | Structure and method for improving crack resistance of simply supported-then-continuous bridge deck slab |
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| CN202010123286.8A CN111206500A (en) | 2020-02-27 | 2020-02-27 | Structure and method for improving crack resistance of simply supported-then-continuous bridge deck slab |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111877182A (en) * | 2020-09-03 | 2020-11-03 | 广东省建筑设计研究院有限公司 | Novel construction method for upper structure of multi-chamber continuous UHPC box girder bridge |
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