CN116289521A - Split prefabricated assembled bridge and construction method thereof - Google Patents
Split prefabricated assembled bridge and construction method thereof Download PDFInfo
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- CN116289521A CN116289521A CN202310531415.0A CN202310531415A CN116289521A CN 116289521 A CN116289521 A CN 116289521A CN 202310531415 A CN202310531415 A CN 202310531415A CN 116289521 A CN116289521 A CN 116289521A
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 239000011178 precast concrete Substances 0.000 claims abstract description 34
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 239000004574 high-performance concrete Substances 0.000 claims abstract description 4
- 210000002435 tendon Anatomy 0.000 claims description 16
- 239000004567 concrete Substances 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 238000004873 anchoring Methods 0.000 description 4
- 238000009417 prefabrication Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000011374 ultra-high-performance concrete Substances 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920006335 epoxy glue Polymers 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000007306 turnover Effects 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
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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
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses a split precast assembled bridge and a construction method thereof, wherein the split precast assembled bridge comprises a supporting mechanism and a precast main beam, the supporting mechanism comprises a supporting column and a precast bent cap, the precast bent cap is arranged at the top of the supporting column, the precast bent cap comprises two precast beam pieces arranged along the forward direction of the bridge, each precast beam piece comprises a precast concrete block, a shear key tooth and an embedded forward connecting rib, the shear key tooth is arranged on the precast concrete block and protrudes out of the inner wall surface of the precast concrete block, the embedded forward connecting rib is arranged on the precast concrete block and protrudes out of the inner wall surface of the precast concrete block, an open groove which is arranged along the transverse direction of the bridge and is opened at the top is formed in the middle of a bent cap primary blank, and a beam piece wet joint is formed by pouring high-performance concrete in the open groove so as to connect the two precast beam pieces to form a whole beam structure. The split prefabricated assembled bridge is simple to construct, and the continuity and the integrity of the prefabricated capping beam are maintained.
Description
Technical Field
The invention relates to the technical field of bridge prefabrication and assembly, in particular to a split prefabrication and assembly bridge and a construction method thereof.
Background
In order to meet the requirements of green and environment-friendly construction and rapid construction of urban bridge construction in recent years, the technology of prefabricating and assembling bridges is rapidly developed. The main process of prefabricating and assembling the bridge is that prefabricating in factories, transporting components, hoisting on site and constructing on pouring pile foundations and pouring bearing platforms.
The capping beam is used as a force transfer member between the upper and lower bridge structures, and the construction size of the capping beam is related to the bridge width, the span and the pier column spacing. For a conventional 30 m-span viaduct, a cover beam of an integral pier is adopted in a bidirectional 6-lane bridge, the transverse bridge has the width exceeding 30m and the weight reaching 400-450 t, and the weight of the cover beam is even larger at the positions of the overpass ramp underpants and the road crossing openings and is limited by the conditions of road transportation along the line and on-site hoisting, and the weight of a prefabricated part (the cover beam) needs to be controlled.
The patent application publication No. CN114457702A discloses a large cantilever sectional prefabricated bent cap bracket-free suspension splicing construction method, which is characterized in that the prefabricated bent cap is divided into a plurality of sections along the transverse bridge direction, the sections are symmetrically arranged from the middle to two sides, and the sections are tensioned by tensioning prestressing force. The method has the problems that in order to ensure the stability of the bent cap section during construction, hoisting equipment is needed for auxiliary positioning, and meanwhile, some prestressed reinforcements are needed to be additionally arranged, and as the two sections are connected by only one small wet joint, the main reinforcement of the bent cap is discontinuous, and the safety redundancy of the structure is not high.
The sectional prefabrication assembly construction bridge in the prior art has the advantages that the connection construction process between the sections is complex, meanwhile, the connection strength between the sections is poor, and the safety redundancy of the structure is not high.
In view of this, it is necessary to propose a split prefabricated assembled bridge that solves or at least alleviates the above-mentioned drawbacks.
Disclosure of Invention
The invention mainly aims to provide a segmented prefabricated assembled bridge and a segmented prefabricated assembled bridge method, and aims to solve the technical problems that the existing segmented prefabricated assembled construction bridge is complex in connection construction process between segments.
In order to achieve the above object, the invention provides a split precast assembled bridge, comprising a supporting mechanism and a precast girder, wherein the precast girder is supported on the supporting mechanism, the supporting mechanism comprises a supporting column and a precast bent cap, the precast bent cap is arranged at the top of the supporting column, the precast bent cap comprises two precast beam pieces arranged along the forward bridge direction, each precast beam piece comprises a precast concrete block, a shear key tooth and an embedded forward connecting rib, the shear key tooth is arranged on the precast concrete block and protrudes out of the inner wall surface of the precast concrete block, the embedded forward connecting rib and the shear key tooth are arranged in a staggered manner in the height direction, prestressed holes arranged along the transverse bridge direction are reserved in the precast concrete block, the two precast beam pieces are oppositely arranged along the forward bridge direction to form a bent cap primary blank arranged at the top of the supporting column, the shear key teeth of one precast beam piece and the shear key teeth of the other precast beam piece are arranged at opposite intervals, an opening groove which is arranged along the transverse bridge direction and is open at the top is formed in the middle of the bent cap primary blank, the bottom splicing seam and the transverse bridge direction end splicing seam of the bent cap primary blank are blocked by a sealing body, the protruding end of the embedded forward connecting rib of one precast beam piece and the protruding end of the embedded forward connecting rib of the other precast beam piece are arranged along the transverse bridge direction in a staggered manner and are respectively positioned in the opening groove, a beam piece wet seam is formed by pouring high-performance concrete in the opening groove so as to connect the two precast beam pieces to form a whole beam structure, the forward bridge size of the beam piece wet seam is 15-25 cm, and the whole beam structure is internally embedded with post-tensioned prestressing ribs in prestressing holes.
Further, the extension length of the protruding end of the embedded forward connecting rib is 5/8 to 7/8 of the forward bridge size of the wet joint of the beam piece.
Further, the shear key teeth extend along the transverse bridge, the plurality of shear key teeth are arranged at intervals along the height direction, the beam piece wet joint comprises a first filling connecting section between two shear key teeth and a second filling connecting section between the inner wall surfaces of two prefabricated beam pieces, and the first filling connecting section and the second filling connecting section are arranged in sequence along the vertical direction and are identical in height.
Further, the forward bridge size ratio of the first filled connection section to the second filled connection section is 1:1.4 to 1:1.8; the height of the first filled connection section is consistent with the forward bridge dimension of the wet seam of the beam sheet.
Further, precast concrete piece includes the prefabricated lid body, prefabricated lid end and prefabricated lid curb plate, the prefabricated lid body, prefabricated lid end and two prefabricated lid curb plates pour the shaping simultaneously, the prestressing force hole is along horizontal bridge to running through prefabricated lid curb plate and prefabricated lid body setting, shear force key tooth and pre-buried forward tie bar all bulge in the internal face setting of prefabricated lid body, the top edge and the lower limb of prefabricated lid body are equipped with pre-buried forward tie bar respectively, the horizontal bridge to both ends of prefabricated lid body are located relatively to two prefabricated lid curb plates, the prefabricated lid end is in between two prefabricated lid curb plates and is in the bottom of prefabricated lid body, the prefabricated lid end bulge sets up in the internal face of prefabricated lid body, the internal face parallel and level of prefabricated lid end is laid to the internal face parallel and level of prefabricated lid end, two prefabricated lid bodies, two prefabricated lid ends and four prefabricated lid curb plates enclose jointly and close and form the bent cap primary blank that has the opening draw-in groove, the top of support column is located to the prefabricated lid body.
Further, the first end of the embedded forward connecting rib is arranged in the precast concrete block, and the second end of the embedded forward connecting rib extends outwards along the direction perpendicular to the inner wall surface of the precast concrete block.
Further, the prefabricated main beam adopts one of a prefabricated T beam, a prefabricated small box beam and a prefabricated steel plate composite beam.
Further, the connection mode of the support column and the prefabricated cover beam is one of grouting sleeve connection, grouting metal corrugated pipe connection, socket connection, slot connection, prestress connection, bolt flange connection and wet joint connection.
Further, the support column comprises a pouring pile foundation, a pouring bearing platform and a prefabricated pier column, the pouring bearing platform is arranged on the pouring pile foundation, the prefabricated pier column is arranged on the pouring bearing platform, and the prefabricated capping beam is arranged on the prefabricated pier column.
The invention also provides a construction method of the split prefabricated assembled bridge, which comprises the following steps:
s10, drilling holes at the design position according to construction design requirements, and casting to form a casting pile foundation and a casting bearing platform;
s20, the prefabricated pier column is applied to a pouring bearing platform;
s30, constructing a prefabricated capping beam on the prefabricated pier stud;
s40, erecting a prefabricated main beam on the prefabricated cover beam;
the step S30 specifically includes:
s31, constructing a floor-free support on the prefabricated pier stud;
s32, placing two precast beam pieces on the precast pier columns through hoisting, and constructing joints of the precast beam pieces and the corresponding two precast pier columns so that each precast beam piece is assembled on the corresponding two precast pier columns to form a capping beam primary blank;
s33, plugging a bottom splicing seam of the cover beam primary blank and a transverse bridge end splicing seam through a sealing body;
s35, pouring to form a beam piece wet joint;
s36, after the strength of the concrete of the wet joint of the beam piece is formed, the prestressed tendons are distributed in the prestressed holes, and the prestressed tendons are then tensioned.
Compared with the prior art, the split prefabricated assembled bridge has the following beneficial effects:
the split prefabricated assembled bridge comprises a supporting mechanism and a prefabricated main beam, wherein the supporting mechanism comprises a supporting column and a prefabricated bent cap, and the prefabricated bent cap is formed by splicing two prefabricated beam pieces through wet joints of the beam pieces applied on site, so that the technical problem that the existing bridge is difficult to apply to the assembled bent cap due to the limitation of road transportation along the line and on-site hoisting conditions is avoided; the precast beam comprises two precast beam pieces arranged along the forward direction of the bridge, the precast beam pieces arranged at the back are equivalent to the precast beam pieces arranged at the front in the forward direction of the bridge, the precast beam pieces comprise precast concrete blocks, shear key teeth and embedded forward connecting ribs, the shear key teeth are arranged on the precast concrete blocks and protrude out of the inner wall surfaces of the precast concrete blocks, one end of each embedded forward connecting rib is embedded in each precast concrete block, the embedded forward connecting ribs are arranged on the precast concrete blocks and protrude out of the inner wall surfaces of the precast concrete blocks, the two precast beam pieces are oppositely arranged along the forward direction of the bridge to form a cover beam primary blank arranged at the top of the supporting column, the middle part of the cover beam primary blank is provided with an open groove which is arranged along the transverse direction of the bridge and is open at the top, the forward direction of the open groove is 15 to 25 cm, the cover beam primary blank is arranged at the top of the supporting column, the bottom splice seam and the transverse bridge end splice seam of the bent cap primary blank are plugged by a sealing body, two precast beam pieces are connected to form a whole beam structure body by pouring beam piece wet joints in an opening groove, the forward bridge size of the beam piece wet joints is 15-25 cm, a template is not required to be set up when the beam piece wet joints are poured, and after-tensioning prestressed tendons are stretched after one-time pouring forming connection, the construction process is simple, meanwhile, shear key teeth, embedded forward connecting tendons and beam piece wet joints of 15-25 cm are arranged, so that the arrangement of the prestressed tendons is not influenced by the beam piece wet joints, the continuity and the integrity of the precast bent cap are maintained, the connection integrity of the two precast beam pieces is improved, the bearing performance is ensured, meanwhile, the arrangement of the shear key teeth, the corresponding embedded forward connecting tendons are arranged in a staggered manner and the beam piece wet joints of 15-25 cm are arranged, the arrangement of the prestressed tendons is not influenced by the beam piece wet joints, the continuity and the integrity of the prefabricated capping beam are maintained, the connection integrity of two prefabricated beam sheets is improved, and the bearing performance is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a split prefabricated assembled bridge according to an embodiment of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a schematic perspective view of a precast beam segment according to an embodiment of the present invention;
FIG. 4 is an enlarged view at B in FIG. 3;
fig. 5 is a schematic cross-sectional structure of a split prefabricated assembled bridge according to an embodiment of the present invention.
Legend description:
100. prefabricating and assembling the bridge in a piece-by-piece manner; 1. a support mechanism; 10. a support column; 20. prefabricating a cover beam; 211. prefabricating beam sheets; 2111. prefabricating concrete blocks; 2112. shear key teeth; 2113. embedding forward connecting ribs; 212. an open groove; 213. wet seam of beam sheet; 2131. a first filled connection section; 2132. and a second filling connection section.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Referring to fig. 1, 2, 3, 4 and 5, the present invention provides a split prefabricated assembled bridge 100, which comprises a supporting mechanism 1 and a prefabricated main beam, wherein the prefabricated main beam is supported on the supporting mechanism 1, the supporting mechanism 1 comprises a supporting column 10 and a prefabricated capping beam 20, the prefabricated capping beam 20 is arranged at the top of the supporting column 10, the prefabricated capping beam 20 comprises two prefabricated beam slices 211 arranged along the forward direction of the bridge, the prefabricated beam slices 211 comprise prefabricated concrete blocks 2111, shear key teeth 2112 and pre-buried forward connecting ribs 2113, the shear key teeth 2112 are arranged on the prefabricated concrete blocks 2111 and are arranged on the inner wall surface of the prefabricated concrete blocks 2111 in a protruding manner, the pre-buried forward connecting ribs 2113 are arranged on the prefabricated concrete blocks 2111 and are arranged on the inner wall surface of the prefabricated concrete blocks 2111 in a staggered manner, pre-stressing holes along the transverse direction are reserved in the prefabricated concrete blocks 2111, the two precast beam pieces 211 are oppositely arranged along the forward bridge direction to form a bent cap primary blank arranged at the top of the support column 10, the shear key teeth 2112 of one precast beam piece 211 and the shear key teeth 2112 of the other precast beam piece 211 are oppositely arranged at intervals, an open groove 212 which is arranged along the transverse bridge direction and is open at the top is formed in the middle of the bent cap primary blank, the bottom splice seam and the transverse bridge direction end splice seam of the bent cap primary blank are blocked by sealing bodies, the protruding end of the embedded forward connecting rib 2113 of one precast beam piece 211 and the protruding end of the embedded forward connecting rib 2113 of the other precast beam piece 211 are arranged along the transverse bridge direction in a staggered manner and are respectively positioned in the open groove 212, a beam piece wet joint 213 is formed by pouring high-performance concrete in the open groove 212 to connect the two precast beam pieces 211 to form a whole beam structure, the forward bridge size of the beam piece wet joint 213 is 15-25 cm, the whole beam structure body is internally embedded with post-tensioned prestressing tendons in the prestressing holes.
The split prefabricated assembled bridge 100 provided by the invention comprises a supporting mechanism 1 and a prefabricated main beam, wherein the supporting mechanism 1 comprises a supporting column 10 and a prefabricated bent cap 20, and the prefabricated bent cap 20 is formed by splicing two prefabricated beam pieces 211 in a beam piece wet joint 213 on site, so that the technical problem that the existing bridge is difficult to be assembled due to the limitation of road transportation along a line and on-site hoisting conditions is avoided; the prefabricated cover beam 20 comprises two prefabricated beam pieces 211 arranged along the forward bridge direction, the prefabricated beam pieces 211 arranged at the back are equivalent to the prefabricated beam pieces 211 arranged at the front in a turnover way along the forward bridge direction, the precast beam piece 211 comprises a precast concrete block 2111, a shear key tooth 2112 and an embedded forward connecting rib 2113, the shear key tooth 2112 is arranged on the precast concrete block 2111 and is arranged protruding from the inner wall surface of the precast concrete block 2111, one end of the embedded forward connecting rib 2113 is embedded in the precast concrete block 2111, the embedded forward connecting rib 2113 is arranged on the precast concrete block 2111 and is arranged protruding from the inner wall surface of the precast concrete block 2111, the two precast beam pieces 211 are oppositely arranged along the forward bridge direction to form a cover beam primary blank arranged at the top of the support column 10, the middle part of the cover beam primary blank is provided with an opening groove 212 which is arranged along the transverse bridge direction and is opened at the top, the forward bridge size of the opening groove 212 is 15 to 25 cm, the cover beam primary blank is arranged at the top of the support column 10, the bottom splice joint and the transverse bridge end splice joint of the cover beam primary blank are plugged by a sealing body, the two precast beam pieces 211 are connected to form the whole beam structure by pouring the beam piece wet joints 213 in the opening grooves 212, the forward bridge size of the beam piece wet joints 213 is 15 to 25 cm, no template is required to be set up when the beam piece wet joints 213 are poured, the post-tensioning prestressed tendons are stretched after one-time pouring and forming connection, the construction process is simple, at the same time, the shear key teeth 2112, the embedded forward connecting ribs 2113 are arranged in a staggered way along the transverse bridge direction, and the beam sheet wet joints 213 of 15 cm to 25 cm are arranged, so that the beam sheet wet joints have a considerable anchoring length, the arrangement of the prestressed tendons is not influenced by the wet joints 213 of the beam sheets, the continuity and the integrity of the prefabricated cover beam 20 are maintained, the connection integrity of the two prefabricated beam sheets 211 is improved, and the bearing performance is ensured.
As can be appreciated, in the present invention, the two precast beam segments 211 are respectively positioned on the supporting mechanism 1, so that the two precast beam segments 211 are combined to form the capping beam primary blank, the protruding ends of the embedded forward connecting ribs 2113 of one precast beam segment 211 and the protruding ends of the embedded forward connecting ribs 2113 of the other precast beam segment 211 are arranged in a staggered manner along the transverse bridge direction and are respectively positioned in the open grooves 212, the protruding ends of the embedded forward connecting ribs 2113 are not required to be connected, that is, the ultra-high performance concrete is poured in the open grooves 212 without being connected, a template is not required to be set up, the embedded forward connecting ribs 2113 which are oppositely arranged are not required to be connected, the forward bridge size of the beam segment wet joint 213 is 15 to 25 cm, the construction process is simple, and the continuity and the integrity of the precast capping beam 20 are maintained.
As can be appreciated, the pre-buried forward connecting rib 2113 of one of the pre-buried forward connecting rib 211 and the protruding end of the pre-buried forward connecting rib 2113 of the other pre-buried forward connecting rib 211 of the pre-buried forward connecting rib 211 are arranged in a staggered manner along the transverse bridge direction and are respectively positioned in the open groove 212. In the concrete construction, after the two precast beam pieces 211 are arranged along the forward bridge direction and form a cover beam primary blank on the support column 10, splicing seams are formed at the bottom of the cover beam primary blank and the end part of the transverse bridge direction, and at the moment, the bottom splicing seams and the end splicing seams of the transverse bridge direction are sealed by adopting epoxy glue or grouting materials, so that the beam piece wet seams 213 are conveniently cast and formed in the opening grooves 212.
Alternatively, there are two support columns 10, two support columns 10 are arranged along the transverse bridge direction, and the precast beam segments 211 are erected on the two support columns 10 along the transverse bridge direction.
Alternatively, the forward bridge dimension of the beam sheet wet seam 213 may be 15 cm, or may be other dimensions such as 20cm or 25 cm.
Further, the protruding end of the pre-buried forward connecting rib 2113 extends 5/8 to 7/8 of the forward bridge dimension of the beam sheet wet seam 213. Optionally, in the present invention, the size of the forward bridge of the beam sheet wet seam 213 is 20cm, the overhanging length of the protruding end of the pre-buried forward connecting rib 2113 is 15 cm, the protruding ends of the pre-buried forward connecting ribs 2113 which are oppositely arranged can be poured to form the beam sheet wet seam 213 without connection, the construction is simple, the equivalent anchoring length is provided, and the continuity and the integrity of the prefabricated capping beam 20 are maintained.
Referring to fig. 3 and 4, more preferably, in order to ensure convenience of construction and bearing performance of the prefabricated capping beam 20, pre-buried forward connecting ribs 2113 are respectively arranged above and below the shear key teeth 2112. Specifically, the plurality of shear key teeth 2112 are sequentially arranged along the height direction, the embedded forward connecting ribs 2113 are arranged above the shear key teeth 2112 at the top, and the embedded forward connecting ribs 2113 are arranged below the shear key teeth 2112 at the bottom. In a specific embodiment, an upper buried forward connecting rib row is arranged above the shear key teeth 2112 at the top, the embedded forward connecting ribs 2113 above the shear key teeth 2112 at the top are distributed at intervals along the transverse bridge to form an upper buried forward connecting rib row, a lower buried forward connecting rib row is arranged below the shear key teeth 2112 at the bottom, the embedded forward connecting ribs 2113 below the shear key teeth 2112 at the bottom are distributed at intervals along the transverse bridge to form a lower buried forward connecting rib row, and the protruding end of the embedded forward connecting rib 2113 of one precast beam piece 211 of the capping beam blank and the protruding end of the embedded forward connecting rib 2113 of the corresponding other precast beam piece 211 are staggered along the transverse bridge. By arranging the upper buried forward connecting rib row and the lower buried forward connecting rib row, the shear key teeth 2112 extend along the transverse bridge direction, and the plurality of shear key teeth 2112 are distributed at intervals along the height direction, so that the bearing capacity of the beam piece wet joint 213 is not weakened.
Referring to fig. 3, 4 and 5, further, in order to further ensure the bearing performance, the shear key teeth 2112 extend along the transverse bridge, the plurality of shear key teeth 2112 are arranged at intervals along the height direction, the beam sheet wet joint 213 includes a first filling connection section 2131 between two shear key teeth 2112 and a second filling connection section 2132 between inner wall surfaces of two prefabricated beam sheets 211, and the first filling connection section 2131 and the second filling connection section 2132 are arranged in sequence along the vertical direction and have the same height. It will be appreciated that the transverse dimension of the first filled connecting segment 2131 is less than the transverse dimension of the second filled connecting segment 2132.
More preferably, in the present invention, the forward bridge size ratio of the first filled connecting segment 2131 and the second filled connecting segment 2132 is 1:1.25 to 1:1.8; the height of the first filled connecting section 2131 corresponds to the forward bridge dimension of the beam slab wet joint 213. In one embodiment of the present invention, the forward bridge size of the first filled connecting segment 2131 is 20 centimeters and the forward bridge size ratio of the second filled connecting segment 2132 is 25 centimeters.
Referring to fig. 3 again, further, the precast concrete segment 2111 includes a precast cap body, a precast cap bottom and precast cap side plates, the precast cap body, the precast cap bottom and two precast cap side plates are cast and formed simultaneously, the prestressed hole runs through the precast cap side plates and the precast cap body along the transverse bridge direction, the shear key teeth 2112 and the embedded forward connecting ribs 2113 are all protruded on the inner wall surface of the precast cap body, the upper edge and the lower edge of the precast cap body are respectively provided with the embedded forward connecting ribs 2113, the two precast cap side plates are oppositely arranged at the transverse bridge direction two ends of the precast cap body, the precast cap bottom is positioned between the two precast cap side plates and at the bottom of the precast cap body, the precast cap bottom is protruded on the inner wall surface of the precast cap body, the inner wall surface of the precast cap side plates and the inner wall surface of the precast cap bottom are arranged in a parallel and level mode, the two precast cap bodies, the two precast cap bottoms and the four precast cap side plates are jointly surrounded to form a cap beam primary blank with an opening clamping groove, and the precast cap body is arranged at the top of the supporting column 10.
More preferably, the prefabricated cover body comprises a contour part and a tapered part, wherein the contour part and the tapered part are distributed along the transverse bridge direction, the tapered part is arranged at one transverse bridge direction end of the contour part, one end, far away from the contour part, of the bottom surface of the tapered part is gradually upwards inclined, and the contour part is arranged on the support column 10. The bearing performance of the structure body is ensured when the weight of the prefabricated cover body is reduced.
Further, in order to secure the anchoring ability, a first end of the pre-buried forward connecting rib 2113 is provided in the precast concrete segment 2111, and a second end of the pre-buried forward connecting rib 2113 is protruded outwardly in a direction perpendicular to an inner wall surface of the precast concrete segment 2111.
Further, the prefabricated main beam adopts one of a prefabricated T beam, a prefabricated small box beam and a prefabricated steel plate composite beam.
Further, the connection mode of the support column 10 and the prefabricated capping beam 20 is one of grouting sleeve connection, grouting metal corrugated pipe connection, socket connection, slot connection, prestress connection, bolt flange connection and wet joint connection.
Further, the support column 10 comprises a pouring pile foundation, a pouring bearing platform and a prefabricated pier column, the pouring bearing platform is arranged on the pouring pile foundation, the prefabricated pier column is arranged on the pouring bearing platform, and the prefabricated capping beam 20 is arranged on the prefabricated pier column.
More preferably, the number of the support columns 10 is two, and the support columns 10 are arranged in one-to-one correspondence with the precast beam segments 211.
The split prefabricated assembled bridge 100 provided by the invention has the following beneficial effects:
pouring ultra-high performance concrete (UHPC) in an opening groove 212 formed by two precast beam pieces 211, connecting the two precast beam pieces 211 to form a whole beam structure body through a beam piece wet joint 213, wherein the size of a forward bridge of the beam piece wet joint 213 is 15-25 cm, the protruding ends of the embedded forward connecting ribs 2113 in the opening groove 212 are not required to be connected, the equivalent anchoring length is achieved, and the arrangement of the reinforcing steel bars and the prestressed ribs is not influenced by the wet joint due to the narrower wet joint, so that the continuity and the integrity of the precast structure are maintained; the inner side of the precast beam piece 211 is provided with a shear key tooth 2112 from top to bottom, so that the connection integrity of the two precast cap beams 20 is improved; the inside of the precast beam piece 211 is reserved with forward connecting steel bars, the length of the protruding end of the reserved forward connecting steel bars is about 3/4 of the width of the wet joint seam, the forward connecting steel bars of the two precast bent caps 20 are staggered for a certain distance along the transverse direction, the steel bars do not need to be connected, the wet joint concrete can be poured after the connecting seam is sealed in place by lifting, a template is not required to be additionally erected when the beam piece wet joint 213 is poured, and the construction is convenient; the width of the wet joint between the two prefabricated cover beams 20 is about 20cm, and the arrangement of the reinforcing steel bars and the prestressed tendons is not affected by the wet joint, so that the continuity and the integrity of the prefabricated structure are maintained; the split prefabricated assembled bridge 100 has the advantages of reasonable structure, convenience in construction operation, improvement of work efficiency and easiness in guaranteeing of construction quality.
The invention also provides a construction method of the split prefabricated assembled bridge 100, which comprises the following steps:
s10, drilling holes at the design position according to construction design requirements, and casting to form a casting pile foundation and a casting bearing platform;
s20, the prefabricated pier column is applied to a pouring bearing platform;
s30, constructing a prefabricated capping beam 20 on the prefabricated pier stud;
s40, erecting a prefabricated main beam on the prefabricated cover beam 20;
the step S30 specifically includes:
s31, constructing a floor-free support on the prefabricated pier stud;
s32, placing two precast beam pieces 211 on the precast pier columns through hoisting, and constructing joints of the precast beam pieces 211 and the corresponding two precast pier columns, so that each precast beam piece 211 is assembled on the corresponding two precast pier columns to form a capping beam primary blank;
s33, plugging a bottom splicing seam of the cover beam primary blank and a transverse bridge end splicing seam through a sealing body;
s35, pouring to form a beam piece wet joint 213;
s36, after the beam piece wet joint 213 concrete forms strength, the prestressed tendons are distributed in the prestressed holes, and the prestressed tendons are then tensioned.
According to the construction method of the split precast assembled bridge 100, when the large bent cap is under the constraint of bridge construction in downtown areas limited by road transportation along the line and on-site hoisting conditions, the large bent cap is divided into two precast beam pieces 211, so that transportation and hoisting are facilitated, the two precast beam pieces 211 are preassembled under the auxiliary effect of a floor stand, the two precast beam pieces 211 are connected to the support column 10, the prestress holes are communicated, and the two precast beam pieces 211 are formed into a whole beam structure body by cast-in-situ to form a beam piece wet joint 213.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. A split prefabricated assembled bridge is characterized in that,
comprises a supporting mechanism and a prefabricated girder, wherein the prefabricated girder is supported on the supporting mechanism,
the supporting mechanism comprises a supporting column and a prefabricated cover beam, the prefabricated cover beam is arranged at the top of the supporting column,
the precast bent cap comprises two precast beam pieces arranged along the forward direction of the bridge, the precast beam pieces comprise precast concrete blocks, shear key teeth and pre-buried forward connecting ribs, the shear key teeth are arranged on the precast concrete blocks and protrude out of the inner wall surfaces of the precast concrete blocks, the pre-buried forward connecting ribs and the shear key teeth are arranged in a staggered manner in the height direction, pre-stress holes distributed along the transverse direction of the bridge are reserved in the precast concrete blocks,
two precast beam pieces are oppositely arranged along the forward bridge direction to form a bent cap primary blank arranged at the top of the support column, the shear key teeth of one precast beam piece and the shear key teeth of the other precast beam piece are oppositely arranged at intervals, an open groove which is arranged along the transverse bridge direction and is open at the top is formed in the middle of the bent cap primary blank, a bottom splicing seam and a transverse bridge direction end splicing seam of the bent cap primary blank are plugged by a sealing body, the protruding end of the embedded forward connecting rib of one precast beam piece and the protruding end of the embedded forward connecting rib of the other precast beam piece are arranged in a staggered manner along the transverse bridge direction and are respectively positioned in the open groove,
and forming a beam piece wet joint by pouring high-performance concrete in the opening groove so as to connect two precast beam pieces to form a whole beam structure body, wherein the forward bridge size of the beam piece wet joint is 15-25 cm, and a post-tensioning prestressed tendon in the prestressed hole is buried in the whole beam structure body.
2. The segmented prefabricated assembled bridge according to claim 1, wherein,
the extension length of the protruding end of the embedded forward connecting rib is 5/8 to 7/8 of the forward bridge size of the beam piece wet joint.
3. The segmented prefabricated assembled bridge according to claim 1, wherein,
the shear key teeth extend along the transverse bridge direction, a plurality of shear key teeth are arranged at intervals along the height direction,
the beam piece wet joint comprises a first filling connecting section and a second filling connecting section, wherein the first filling connecting section is positioned between two shear key teeth, the second filling connecting section is positioned between the inner wall surfaces of the prefabricated beam pieces, and the first filling connecting section and the second filling connecting section are vertically and sequentially distributed and are identical in height.
4. A segmented prefabricated assembled bridge according to claim 3,
the forward bridge size ratio of the first filled connection section to the second filled connection section is 1:1.4 to 1:1.8; the height of the first filled connection section is consistent with the forward bridge dimension of the beam sheet wet seam.
5. A segmented prefabricated assembled bridge according to any one of claims 1 to 4,
the precast concrete block comprises a precast cover body, a precast cover bottom and precast cover side plates, the precast cover body, the precast cover bottom and the two precast cover side plates are cast and formed simultaneously, the prestressed holes penetrate through the precast cover side plates and the precast cover body along the transverse bridge direction, the shear key teeth and the embedded forward connecting ribs are protruded out of the inner wall surface of the precast cover body, the upper edge and the lower edge of the precast cover body are respectively provided with the embedded forward connecting ribs,
the two prefabricated cover side plates are oppositely arranged at the two ends of the transverse bridge of the prefabricated cover body, the prefabricated cover bottom is arranged between the two prefabricated cover side plates and at the bottom of the prefabricated cover body, the prefabricated cover bottom protrudes out of the inner wall surface of the prefabricated cover body, the inner wall surface of the prefabricated cover side plates is arranged flush with the inner wall surface of the prefabricated cover bottom,
the two prefabricated cover bodies, the two prefabricated cover bottoms and the four prefabricated cover side plates enclose together to form a cover beam primary blank with the opening clamping groove, and the prefabricated cover bodies are arranged at the tops of the supporting columns.
6. The segmented prefabricated assembled bridge according to any one of claims 1 to 4, wherein,
the first end of the embedded forward connecting rib is arranged in the precast concrete block, and the second end of the embedded forward connecting rib extends outwards along the direction perpendicular to the inner wall surface of the precast concrete block.
7. The segmented prefabricated assembled bridge according to any one of claims 1 to 4, wherein,
the prefabricated main beam adopts one of a prefabricated T beam, a prefabricated small box beam and a prefabricated steel plate composite beam.
8. The segmented prefabricated assembled bridge according to any one of claims 1 to 4, wherein,
the connection mode of the support column and the prefabricated bent cap is one of grouting sleeve connection, grouting metal corrugated pipe connection, socket connection, slot connection, prestress connection, bolt flange connection and wet joint connection.
9. The segmented prefabricated assembled bridge according to any one of claims 1 to 4, wherein,
the support column comprises a pouring pile foundation, a pouring bearing platform and a prefabricated pier column, the pouring bearing platform is arranged on the pouring pile foundation, the prefabricated pier column is arranged on the pouring bearing platform, and the prefabricated capping beam is arranged on the prefabricated pier column.
10. A construction method of a split prefabricated assembled bridge, which is used for constructing the split prefabricated assembled bridge according to any one of claims 1 to 9, and comprises the following steps:
s10, drilling holes at the design position according to construction design requirements, and casting to form a casting pile foundation and a casting bearing platform;
s20, the prefabricated pier column is applied to the pouring bearing platform;
s30, applying a prefabricated capping beam on the prefabricated pier stud;
s40, erecting a prefabricated main beam on the prefabricated cover beam;
the step S30 specifically includes:
s31, constructing a floor-free support on the prefabricated pier stud;
s32, placing two precast beam pieces on the precast pier columns through hoisting, and constructing joints of the precast beam pieces and the two corresponding precast pier columns so that each precast beam piece is assembled on the two corresponding precast pier columns to form a capping beam primary blank;
s33, plugging a bottom splicing seam and a transverse bridge end splicing seam of the cover beam primary blank through a sealing body;
s35, pouring to form a beam piece wet joint;
s36, after the strength of the concrete of the wet joint of the beam piece is formed, laying the prestressed tendons in the prestressed holes, and tensioning the prestressed tendons.
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| CN202310531415.0A CN116289521A (en) | 2023-05-12 | 2023-05-12 | Split prefabricated assembled bridge and construction method thereof |
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Cited By (1)
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| CN116695548A (en) * | 2023-08-04 | 2023-09-05 | 上海建工二建集团有限公司 | Longitudinal split narrow-slit connecting structure of overhead bridge capping beam and construction method |
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