CN107806008A - A kind of integration hollow slab bridge girder construction and its construction method based on ultra-high performance concrete connection - Google Patents
A kind of integration hollow slab bridge girder construction and its construction method based on ultra-high performance concrete connection Download PDFInfo
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- CN107806008A CN107806008A CN201710937136.9A CN201710937136A CN107806008A CN 107806008 A CN107806008 A CN 107806008A CN 201710937136 A CN201710937136 A CN 201710937136A CN 107806008 A CN107806008 A CN 107806008A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 98
- 238000010276 construction Methods 0.000 title claims abstract description 39
- 230000010354 integration Effects 0.000 title abstract 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 101
- 239000010959 steel Substances 0.000 claims abstract description 101
- 230000002787 reinforcement Effects 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 11
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 45
- 239000004567 concrete Substances 0.000 claims description 19
- 238000005452 bending Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- 238000012549 training Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000126 substance Substances 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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
- E01D19/06—Arrangement, construction or bridging of expansion joints
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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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Abstract
The invention discloses a kind of integration hollow slab bridge girder construction and its construction method based on ultra-high performance concrete connection.The bridge structure is to be connected and composed in bridge lateral direction by least three pre-cast hollow slab by least two ultra-high performance concrete seams and some ultra-high performance concrete lateral straps.Above-mentioned ultra-high performance concrete seam includes hinge seam and the ultra-high performance concrete longitudinal band between two hollow slab girders；Hinge seam forms basic framework by two precast hollow slab webs and the pre-buried lateral connection reinforcing bar stretched out by web, longitudinal reinforcement, stirrup, is filled with ultra-high performance concrete；Ultra-high performance concrete longitudinal band includes precast beam top plate and stretches out the framework of steel reinforcement that reinforcing bar, longitudinal reinforcement, transverse steel are formed, and is filled simultaneously with ultra-high performance concrete with hinge seam.Bridge structure stress performance disclosed by the invention is good, good endurance, life-cycle remarkable in economical benefits, and construction procedure can use traditional construction equipment and technique, and easy, quick, rapid.
Description
Technical Field
The invention relates to the technical field of bridge engineering, and particularly provides an integrated hollow slab bridge structure based on ultra-high performance concrete connection and a construction method thereof.
Background
The assembly type hollow slab bridge generally has hinge joint falling and water seepage, the transverse integrity of the hollow slab is low, and the bridge deck pavement is damaged, cracked, pushed and other typical diseases. Furthermore, hollow slab design calculations are based on the hinge plate theory, which assumes that the ideal "hinge" only bears shear, neglecting its tension; in fact, the hollow slab hinge joint is subjected to bending moment around the longitudinal direction of the beam besides shearing force, and transverse bending moment when each hollow slab works cooperatively; the calculation theory of the hollow slab and the actual working state of the hinge joint have deviation. In the prior art, the defects caused by the hinge joint are not fundamentally solved by the limitation of the material performance of concrete and the self structure of a hollow slab bridge. In addition, with the development of economic society, the traffic volume, particularly overloaded vehicles, is rapidly increased, and the traffic volume, particularly overloaded vehicles, interacts with long-term adverse factors, so that the development of bridge diseases is promoted.
The ultra-high performance concrete consists of reactive powder concrete and steel fibers, and is a cement-based composite material with ultrahigh strength, ultrahigh toughness and high durability. The hinge joints of the hollow slabs are filled with the ultra-high performance concrete, and the bridge deck is provided with the longitudinal and transverse ultra-high performance concrete strips, so that the transverse connection performance of the hollow slabs can be effectively improved, the stress performance of the joint joints of the hollow slabs is improved, the integral rigidity, the long-term service performance and the durability of the bridge are improved, the superior mechanical property of the ultra-high performance concrete is fully exerted, and the whole service life cost of the hollow slab bridge is reduced. Only shear forces are transmitted as opposed to conventional hinge joint designs and are therefore referred to as joints.
Disclosure of Invention
The invention aims to provide an integrated hollow slab bridge structure based on ultra-high performance concrete connection, the ultra-high performance concrete joint has better stress and performance, can bear shear force, torque and transverse bending moment and prevent water seepage, the joint and the transverse strip space are integrated in a net shape, the integral rigidity of the bridge is improved, and the integrated bridge structure has better full-life economy.
The technical scheme provided by the invention is as follows:
the integrated hollow slab bridge structure based on the ultra-high performance concrete connection is formed by connecting at least three prefabricated hollow slab beams (1) in the transverse direction of a bridge through at least two ultra-high performance concrete joints and a plurality of ultra-high performance concrete transverse strips (13).
Preferably, the ultra-high performance concrete joint comprises a hinge joint (11) between two prefabricated hollow slab beams and an ultra-high performance concrete longitudinal strip (12); wherein,
the hinge joint (11) comprises a hinge joint frame and ultrahigh-performance concrete filled in the hinge joint frame; the hinge joint frame is composed of webs of two prefabricated hollow plate beams (1), hinge joint transverse connecting steel bars (2) extending out of the webs, hinge joint longitudinal steel bars (4) and hinge joint stirrups (5); the hinge joint transverse connecting steel bars (2) are door-shaped steel bars and are arranged in an array shape; 2-3 longitudinal hinge joint reinforcing steel bars (4) are transversely and symmetrically arranged at the bottom layer of the hinge joint (11), and 1 longitudinal hinge joint reinforcing steel bar (4) is arranged at other positions;
the ultra-high performance concrete longitudinal strip (12) comprises a longitudinal strip steel reinforcement framework and ultra-high performance concrete filled in the longitudinal strip steel reinforcement framework; the longitudinal strip steel bar framework is composed of prefabricated beam top plate extending steel bars (3), longitudinal strip longitudinal steel bars (6) and longitudinal strip transverse steel bars (7), and the longitudinal strip longitudinal steel bars (6) are located on the lower layer of the longitudinal strip transverse steel bars (7); the longitudinal strip steel reinforcement framework and the hinge joint framework form a joint integral steel reinforcement framework.
Preferably, the diameter of the hinge joint transverse connecting steel bar (2) is 10-12 mm, and the distance between two branches in the shape of a Chinese character 'men' is 10-20 cm; the vertical distance between the transverse connecting steel bars (2) of the hinge joint is 12 cm-16 cm, and the longitudinal distance is 30 cm-42 cm; the vertical height difference of the hinge joint transverse connecting steel bar (2) is at least 1 cm-1.5 cm; the diameter of the longitudinal hinge joint steel bar (4) is 6-12 mm, and the vertical distance is 12-16 cm; the diameter of the hinge joint stirrup (5) is 6-12 mm, and the longitudinal distance is 30-42 cm. Through the setting of above-mentioned hinge seam transverse connection reinforcing bar, not only can improve seam faying face shear strength, make faying face shear ductility increase simultaneously, and construction convenience.
Preferably, the width of the ultra-high performance concrete longitudinal strip (12) is 0.3-0.8 m, the thickness of the ultra-high performance concrete longitudinal strip is 3.5-5.0 cm, and the width of the ultra-high performance concrete longitudinal strip (12) is 2-3 times of the width of the hinge joint (11). According to the structural scheme of the longitudinal strips, the requirements on strength and rigidity can be met, and due to the excellent durability of the ultra-high performance concrete, the water seepage prevention function of the joint is realized.
Preferably, the diameter of the precast beam top plate extending steel bar (3) is 10-20 mm within the width range of the ultra-high performance concrete longitudinal strip (12), the extending length is 5-7 cm, and the longitudinal distance and the transverse distance are both 12-22 cm.
Preferably, the diameters of the longitudinal reinforcing steel bars (6) of the longitudinal strips and the transverse reinforcing steel bars (7) of the longitudinal strips are both 6-12 mm, and the distance between the longitudinal reinforcing steel bars and the transverse reinforcing steel bars is 3-20 cm; and the longitudinal strip transverse reinforcing steel bar (7) extends out of the ultra-high performance concrete longitudinal strip (12) by 10-20 cm. According to the scheme for arranging the longitudinal strip steel bars, the requirements on the strength and the rigidity of the joint can be well met.
Preferably, 3-7 tracks of the ultra-high performance concrete transverse strip (13) are longitudinally arranged along the bridge, and the length of the strip is the same as the width of the bridge deck; the thickness of the ultra-high performance concrete longitudinal strip is 3.5 cm-5.0 cm, and the width of the ultra-high performance concrete longitudinal strip is 1.5-3 times of the width of the ultra-high performance concrete longitudinal strip (12), and is 0.5 m-2.4 m; the prefabricated beam top plate extends out of the reinforcing steel bar (3) within the width range of the ultra-high performance concrete transverse strip (13), the diameter is 10-20 mm, the extending length is 5-7 cm, and the longitudinal distance and the transverse distance are both 12-22 cm. According to the preferable transverse strip structure scheme, the requirements on the strength and the rigidity of the transverse strip structure can be met, and the transverse integrity of the hollow slab bridge is improved.
Preferably, the ultra-high performance concrete transverse strip (13) is provided with a transverse strip transverse steel bar (9) and a transverse strip longitudinal steel bar (10), and the transverse strip longitudinal steel bar (10) is positioned at the lower layer of the transverse strip transverse steel bar (9); the diameters of the transverse strip transverse steel bars (9) and the transverse strip longitudinal steel bars (10) are both 6-12 mm, and the distance between the transverse strip transverse steel bars and the transverse strip longitudinal steel bars is 3-20 cm; and the transverse strip longitudinal steel bar (10) extends out of the ultra-high performance concrete transverse strip (13) by 10-20 cm.
Preferably, the ultra-high performance concrete longitudinal strips (12) and the ultra-high performance concrete transverse strips (13) are mutually staggered to form a net structure; in the crossing area, there is no longitudinal strip transverse reinforcement (7) or transverse strip longitudinal reinforcement (10). The joints and the transverse strips are poured simultaneously, no joint exists between the joints, the joints and the transverse strips are integrated in space, and the joints and the prefabricated hollow slab beams are effectively connected, so that the rigidity of the hollow slab bridge is improved, and the overall performance is better.
The construction method of the integrated hollow slab bridge structure based on the ultra-high performance concrete connection comprises the following steps:
(a) manufacturing a prefabricated hollow slab beam template, binding hinge joints and transversely connecting reinforcing steel bars, bending a part extending out of the surface of a web plate of the hollow slab beam into a shape with the same inclination as that of the web plate, attaching the web plate template, pouring common concrete, maintaining and storing the beam;
(b) chiseling off concrete around the bent hinge joint transverse connecting steel bar, and chiseling the surface of a web plate of the hollow slab beam to roughen the surface of the top surface of the hollow slab;
(c) straightening the transverse connecting reinforcing steel bars of the hinge joints of the bending sections, enabling the reinforcing steel bars on the left side of the precast beam to be inclined upwards and the reinforcing steel bars on the right side to be inclined downwards, wherein the inclination angle α is 1.2 x (phi/2)/D, phi is the diameter of the reinforcing steel bars, D is the distance between the transverse connecting reinforcing steel bars of the hinge joints and the surface of the web plate of the hollow slab beam, and the error is not more than α/2;
(d) binding or spot-welding the longitudinal hinge joint reinforcing steel bars on the upper parts of the transverse hinge joint connecting reinforcing steel bars;
(e) binding or spot-welding the hinge joint stirrup to the longitudinal steel bar;
(f) hoisting the prefabricated hollow plate beam, firstly hoisting a first beam on the left side, slowly moving a beam body to the right from the left side when a second beam is hoisted to a position higher than the vertical elevation of the installed first beam by the vertical distance of a transverse connecting steel bar of a hinge joint, and then slowly moving the beam body to the right, wherein the vertical distance of the transverse connecting steel bar of the hinge joint is 12-16 cm, and sequentially installing other prefabricated beam bodies from the left side to the right side according to the method;
(g) manufacturing longitudinal strip templates and transverse strip templates, and binding longitudinal steel bars and transverse steel bars of the longitudinal strips and the transverse strips respectively;
(h) wetting the joint surface of the new concrete and the old concrete, pouring the ultrahigh-performance concrete of the hinge joint, the longitudinal strip and the transverse strip, and finishing maintenance;
(i) binding reinforcing steel bars of the bridge deck and pouring common concrete of the bridge deck.
In the construction process of the integrated hollow slab bridge structure based on the ultrahigh-performance concrete connection, the construction equipment and the construction process of the traditional hollow slab bridge structure can be adopted, new equipment investment is not required to be added, new skill training is not required to be carried out on constructors, the construction method is simple, convenient, rapid and quick, and the method has important significance for ensuring the construction period and improving the construction efficiency.
Compared with the prior art, the invention has the advantages that:
compared with the traditional hollow slab bridge, the integrated hollow slab bridge structure based on the ultra-high performance concrete connection provided by the invention has the advantages that all precast beams are connected through the spatial reticular integrated ultra-high performance concrete joints and transverse strips, so that the transverse connection performance between the beams is improved, the integral rigidity of the bridge is improved, and the long-term service performance and the durability of the bridge are improved.
The integrated hollow slab bridge structure based on the ultra-high performance concrete connection provided by the invention has the advantages that the overall rigidity of the bridge is improved, the stress state of a bridge deck pavement layer is improved, and the problems that a common concrete bridge deck is easy to crack and asphalt pavement is easy to damage can be effectively solved.
The ultrahigh-performance joint applied to the assembled hollow slab bridge provided by the invention adopts the novel material ultrahigh-performance concrete, overcomes the defects of low strength, low bonding strength, poor durability and the like of common concrete, meets the functional requirements of the joint part in various aspects such as shear resistance, bending resistance, water seepage prevention and the like, improves the application current situation that the deviation exists between the hinge design calculation theory of the hollow slab and the actual stress state, avoids the defects of breakage, falling, water seepage and the like of the hinge joint of the traditional hollow slab bridge, and reduces the whole service life of the hollow slab bridge.
Fourthly, the construction method of the integrated hollow slab bridge structure based on the ultra-high performance concrete connection is different from the traditional prefabricated assembly type hollow slab bridge structure, firstly binding hinge joint reinforcing steel bars, then hoisting the prefabricated beam, and therefore construction is more convenient and rapid, and the problem that hinge joint construction of the traditional hollow slab bridge structure is difficult is solved.
In conclusion, the technical scheme of the invention is completely used for the fabricated hollow slab bridge, and the feasibility and the construction efficiency of the bridge structure and the construction thereof can be better ensured by combining the construction technology and equipment for forming the bridge type with the invention.
Drawings
Fig. 1 is a front view of an ultra-high performance concrete joint according to an embodiment of the present invention, taken along a cross section.
3 fig. 3 2 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 at 3 a 3- 3 a 3 in 3 fig. 3 1 3. 3
Fig. 3 is a cross-sectional view at B-B in fig. 1.
Fig. 4 is a front view in cross section of an integrated hollow slab bridge construction based on ultra high performance concrete joining in an embodiment of the present invention.
3 fig. 35 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 at 3 a 3- 3 a 3 in 3 fig. 3 4 3. 3
Fig. 6 is a cross-sectional view at B-B in fig. 4.
Description of reference numerals:
1. prefabricating a hollow plate girder; 2. embedding transverse connecting steel bars of the hinge joints; 3. embedding a top plate extending out of a steel bar; 4. hinging longitudinal steel bars; 5. hinging and sewing the stirrup; 6. longitudinal strip longitudinal reinforcement; 7. longitudinal strip transverse reinforcement; 8. ultra-high performance concrete; 9. transverse stripe transverse steel bars; 10. transverse strip longitudinal reinforcement; 11. hinging and sewing; 12. a longitudinal strip; 13. a transverse strip.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below. Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Example (b):
as shown in fig. 1 to 6, the integrated hollow slab bridge structure connected by the ultra-high performance concrete in the present embodiment is formed by connecting three prefabricated hollow slab beams 1 in the transverse direction of the bridge through two ultra-high performance concrete joints and five ultra-high performance concrete transverse strips 13.
As shown in fig. 1 to 3, the ultra high performance concrete joint structure for fabricated hollow slab bridges of the present invention includes a hinge joint 11 between two hollow slab beams and an ultra high performance concrete longitudinal strip 12. The hinge joint 11 is formed by two prefabricated hollow plate beams 1 web plates, embedded transverse connecting steel bars 2 extending from the web plates, longitudinal steel bars 4 and stirrups 5 to form a basic frame, and the frame is filled with ultrahigh-performance concrete 8. The ultra-high performance concrete longitudinal strip 12 comprises a steel bar framework formed by extending steel bars 3, longitudinal steel bars 6 and transverse steel bars 7 out of the top plate of the precast beam 1, and is filled with ultra-high performance concrete 8 together with the hinge joint.
in the ultrahigh-performance concrete joint, the structure of a prefabricated hollow slab beam 1 is matched with the structure of a hinge joint 11, the two web side surfaces of the prefabricated hollow slab beam 1 are connecting surfaces with the hinge joint 11, the prefabricated hollow slab beam 1 is provided with hinge joint transverse connecting steel bars 2 extending out of the connecting surfaces, the hinge joint transverse connecting steel bars 2 are in a 'door' shape (see fig. 3) and are arranged in an array shape, in the embodiment, the diameter of each hinge joint transverse steel bar 2 is 10mm, the distance between two branches is 15cm, the vertical distance is 12cm, the longitudinal distance is a convenient frame beam 35 cm., the vertical height difference of the hinge joint transverse steel bars on the two sides of the hollow slab prefabricated beam is at least 1.2cm, the angle of inclination of the transverse connecting steel bar α is 4 degrees, the diameter of the hinge joint longitudinal steel bar 4 is 10mm, the vertical distance is the same as that of the hinge joint transverse connecting steel bar 2, is 12cm, the bottom layer of the hinge joint is transversely and symmetrically arranged with 3 longitudinal steel bars 4, the rest positions are provided with 1 longitudinal skeleton 4 (see fig. 3), the diameter of the longitudinal skeleton 5, the longitudinal distance of the hinge joint longitudinal skeleton 5 is 10mm, the longitudinal distance of the hinge joint longitudinal reinforcement 5cm, the longitudinal reinforcement is 10cm, the longitudinal distance of the longitudinal reinforcement strip, the longitudinal reinforcement strip is 7.6 cm, the longitudinal reinforcement strip is arranged in the longitudinal skeleton of the longitudinal skeleton, the longitudinal skeleton transverse skeleton, the longitudinal reinforcement strip is 7.6 cm, the longitudinal reinforcement strip is arranged in the longitudinal reinforcement strip, the longitudinal reinforcement strip is arranged in the longitudinal skeleton of the longitudinal skeleton transverse skeleton of the longitudinal reinforcement strip, the longitudinal skeleton is arranged in the longitudinal skeleton is.
In the bridge structure of the embodiment, the ultra-high performance concrete transverse strips 13 are arranged for 5 times along the longitudinal direction of the bridge, and the length of the strips is the same as the width of the bridge deck (see fig. 5). The transverse strips were 4.0cm thick and 0.86m wide. The prefabricated hollow slab beam 1 is provided with connecting reinforcing steel bars 3 extending out of a top plate within the width range of an ultrahigh-performance concrete transverse strip 13, the diameter of each reinforcing steel bar is 10mm, the extending length of each reinforcing steel bar is 6cm, and the longitudinal distance and the transverse distance of each reinforcing steel bar are 20cm (see figure 4). The ultra-high performance concrete transverse strip 13 is provided with a longitudinal steel bar 10 and a transverse steel bar 9, and the longitudinal steel bar 10 is arranged at the lower layer of the transverse steel bar 9; the diameters of the longitudinal steel bars 10 and the transverse steel bars 9 are 10mm, and the distances between the longitudinal steel bars and the transverse steel bars are 10cm and 15cm respectively; and the longitudinal reinforcing bars 10 are extended by 15cm from the transverse strips 13 (see fig. 5).
In the bridge structure of the embodiment, the joints of the transverse strips 13 and the hollow slab are simultaneously filled and poured with the ultra-high performance concrete 8, and the longitudinal strips 12 and the transverse strips 13 are staggered with each other to form a net structure. In the crossing area of the longitudinal strips 12 and the transverse strips 13, the transverse steel bars 7 of the longitudinal strips 12 or the longitudinal steel bars 10 of the transverse strips 13 are eliminated, as shown in fig. 6.
The construction method of the integrated hollow slab bridge structure based on the ultra-high performance concrete connection in the actual engineering application comprises the following steps:
it should be noted that, in the following construction steps, the terms "left side, right side, left side and right side" respectively represent two sides of the beam, and the terms "left side" and "right side" and "left side" and "right side" may be interchanged in the whole construction step.
(a) Manufacturing a prefabricated hollow slab beam template, and binding reinforcing steel bars; pouring common concrete, maintaining, completing the construction of prestress, and storing the beam;
(b) chiseling concrete around the bent hinge joint transverse connecting steel bar, roughening a joint surface, and roughening the surface of the top surface of the hollow plate;
(c) straightening transverse connecting reinforcing steel bars of hinge joints of the bending sections, wherein the reinforcing steel bars on the left side of the precast beam are upwards inclined, the reinforcing steel bars on the right side of the precast beam are downwards inclined, and the inclination angle α is 4 degrees;
(d) binding or spot-welding the longitudinal hinge joint reinforcing steel bars on the upper parts of the transverse hinge joint connecting reinforcing steel bars;
(e) binding or spot-welding the hinge joint stirrup to the hinge joint longitudinal steel bar;
(f) hoisting the prefabricated hollow plate beam, firstly hoisting a first beam on the left side, when a second beam is hoisted to be higher than the vertical elevation of the first beam by about 14cm after installation, slowly moving a beam body to the left side to a designed position, then slowly moving the beam body downwards to the designed elevation, and sequentially installing other prefabricated beam bodies from the left side to the right side according to the method;
(g) manufacturing longitudinal strip templates and transverse strip templates, and respectively manufacturing longitudinal reinforcing steel bars and transverse reinforcing steel bars of the longitudinal strips and the transverse strips;
(h) wetting the joint surface of the new concrete and the old concrete, pouring the ultrahigh-performance concrete of the hinge joint, the longitudinal strip and the transverse strip, and finishing maintenance;
(i) and binding bridge deck reinforcing steel bars, pouring common bridge deck concrete, and completing construction of auxiliary facilities such as bridge deck pavement and the like.
In the construction process of the integrated hollow slab bridge structure based on the ultrahigh-performance concrete connection, the construction equipment and the construction process of the traditional hollow slab bridge structure can be adopted, new equipment investment is not required to be added, new skill training is not required to be carried out on constructors, the construction method is simple, convenient, rapid and quick, and the method has important significance for ensuring the construction period and improving the construction efficiency.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. The integrated hollow slab bridge structure based on the ultra-high performance concrete connection is characterized in that the bridge structure is formed by connecting at least three prefabricated hollow slab beams (1) in the transverse direction of a bridge through at least two ultra-high performance concrete joints and a plurality of ultra-high performance concrete transverse strips (13).
2. The integrated ultra high performance concrete connection-based hollow slab bridge construction according to claim 1, wherein the ultra high performance concrete joints comprise hinge joints (11) between two prefabricated hollow slab beams and ultra high performance concrete longitudinal strips (12); wherein,
the hinge joint (11) comprises a hinge joint frame and ultrahigh-performance concrete filled in the hinge joint frame; the hinge joint frame is composed of webs of two prefabricated hollow plate beams (1), hinge joint transverse connecting steel bars (2) extending out of the webs, hinge joint longitudinal steel bars (4) and hinge joint stirrups (5); the hinge joint transverse connecting steel bars (2) are door-shaped steel bars and are arranged in an array shape; 2-3 longitudinal hinge joint reinforcing steel bars (4) are transversely and symmetrically arranged at the bottom layer of the hinge joint (11), and 1 longitudinal hinge joint reinforcing steel bar (4) is arranged at other positions;
the ultra-high performance concrete longitudinal strip (12) comprises a longitudinal strip steel reinforcement framework and ultra-high performance concrete filled in the longitudinal strip steel reinforcement framework; the longitudinal strip steel bar framework is composed of prefabricated beam top plate extending steel bars (3), longitudinal strip longitudinal steel bars (6) and longitudinal strip transverse steel bars (7), and the longitudinal strip longitudinal steel bars (6) are located on the lower layer of the longitudinal strip transverse steel bars (7); the longitudinal strip steel reinforcement framework and the hinge joint framework form a joint integral steel reinforcement framework.
3. The integrated hollow slab bridge structure based on ultra-high performance concrete connection according to claim 2, wherein the diameter of the hinge joint transverse connecting steel bar (2) is 10-12 mm, and the distance between two branches of the portal shape is 10-20 cm; the vertical distance between the transverse connecting steel bars (2) of the hinge joint is 12 cm-16 cm, and the longitudinal distance is 30 cm-42 cm; the vertical height difference of the hinge joint transverse connecting steel bar (2) is at least 1 cm-1.5 cm; the diameter of the longitudinal hinge joint steel bar (4) is 6-12 mm, and the vertical distance is 12-16 cm; the diameter of the hinge joint stirrup (5) is 6-12 mm, and the longitudinal distance is 30-42 cm.
4. The integrated hollow slab bridge structure based on ultra-high performance concrete connection according to claim 3, wherein the width of the ultra-high performance concrete longitudinal strips (12) is 0.3-0.8 m, the thickness is 3.5-5.0 cm, and the width of the ultra-high performance concrete longitudinal strips (12) is 2-3 times of the width of the hinge joints (11).
5. The integrated hollow slab bridge structure based on ultra-high performance concrete connection according to claim 4, wherein the precast beam top slab protruding reinforcing steel bars (3) have a diameter of 10mm to 20mm, a protruding length of 5cm to 7cm, and a longitudinal and transverse distance of 12cm to 22cm within the width range of the ultra-high performance concrete longitudinal strips (12).
6. The integrated hollow slab bridge structure based on the ultra-high performance concrete connection according to claim 5, wherein the diameters of the longitudinal strip longitudinal steel bars (6) and the longitudinal strip transverse steel bars (7) are both 6-12 mm, and the distance between the longitudinal strip longitudinal steel bars and the longitudinal strip transverse steel bars is both 3-20 cm; and the longitudinal strip transverse reinforcing steel bar (7) extends out of the ultra-high performance concrete longitudinal strip (12) by 10-20 cm.
7. The integrated hollow slab bridge structure based on ultra-high performance concrete connection according to any one of claims 1 to 6, wherein the ultra-high performance concrete transverse strips (13) are arranged 3-7 times along the longitudinal direction of the bridge, and the length is the same as the width of the bridge deck; the thickness of the ultra-high performance concrete longitudinal strip is 3.5 cm-5.0 cm, and the width of the ultra-high performance concrete longitudinal strip is 1.5-3 times of the width of the ultra-high performance concrete longitudinal strip (12), and is 0.5 m-2.4 m; the prefabricated beam top plate extends out of the reinforcing steel bar (3) within the width range of the ultra-high performance concrete transverse strip (13), the diameter is 10-20 mm, the extending length is 5-7 cm, and the longitudinal distance and the transverse distance are both 12-22 cm.
8. The integrated ultra high performance concrete connection-based hollow slab bridge construction according to claim 7, wherein the ultra high performance concrete transverse strips (13) are provided with transverse strip transverse reinforcements (9) and transverse strip longitudinal reinforcements (10), and the transverse strip longitudinal reinforcements (10) are positioned under the transverse strip transverse reinforcements (9); the diameters of the transverse strip transverse steel bars (9) and the transverse strip longitudinal steel bars (10) are both 6-12 mm, and the distance between the transverse strip transverse steel bars and the transverse strip longitudinal steel bars is 3-20 cm; and the transverse strip longitudinal steel bar (10) extends out of the ultra-high performance concrete transverse strip (13) by 10-20 cm.
9. The integrated ultra high performance concrete connection-based hollow slab bridge construction according to claim 8, wherein the ultra high performance concrete longitudinal strips (12) and the ultra high performance concrete transverse strips (13) are interlaced with each other to form a net structure.
10. The construction method of the integrated hollow slab bridge construction based on ultra-high performance concrete connection according to claim 9, characterized by comprising the steps of:
(a) manufacturing a prefabricated hollow slab beam template, binding hinge joints and transversely connecting reinforcing steel bars, bending a part extending out of the surface of a web plate of the hollow slab beam into a shape with the same inclination as that of the web plate, attaching the web plate template, pouring common concrete, maintaining and storing the beam;
(b) chiseling off concrete around the bent hinge joint transverse connecting steel bar, and chiseling the surface of a web plate of the hollow slab beam to roughen the surface of the top surface of the hollow slab;
(c) straightening the transverse connecting reinforcing steel bars of the hinge joints of the bending sections, enabling the reinforcing steel bars on the left side of the precast beam to be inclined upwards and the reinforcing steel bars on the right side to be inclined downwards, wherein the inclination angle α is 1.2 x (phi/2)/D, phi is the diameter of the reinforcing steel bars, D is the distance between the transverse connecting reinforcing steel bars of the hinge joints and the surface of the web plate of the hollow slab beam, and the error is not more than α/2;
(d) binding or spot-welding the longitudinal hinge joint reinforcing steel bars on the upper parts of the transverse hinge joint connecting reinforcing steel bars;
(e) binding or spot-welding the hinge joint stirrup to the longitudinal steel bar;
(f) hoisting the prefabricated hollow plate beam, firstly hoisting a first beam on the left side, slowly moving a beam body to the right from the left side when a second beam is hoisted to a position higher than the vertical elevation of the installed first beam by the vertical distance of a transverse connecting steel bar of a hinge joint, and then slowly moving the beam body to the right, wherein the vertical distance of the transverse connecting steel bar of the hinge joint is 12-16 cm, and sequentially installing other prefabricated beam bodies from the left side to the right side according to the method;
(g) manufacturing longitudinal strip templates and transverse strip templates, and binding longitudinal steel bars and transverse steel bars of the longitudinal strips and the transverse strips respectively;
(h) wetting the joint surface of the new concrete and the old concrete, pouring the ultrahigh-performance concrete of the hinge joint, the longitudinal strip and the transverse strip, and finishing maintenance;
(i) binding reinforcing steel bars of the bridge deck and pouring common concrete of the bridge deck.
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| CN112144414A (en) * | 2020-09-29 | 2020-12-29 | 江西省地质工程(集团)公司 | Construction method for embedded ribs of small box girder top plate |
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