CN116289482A - Sectional prefabricated assembled bridge and construction method thereof - Google Patents
Sectional prefabricated assembled bridge and construction method thereof Download PDFInfo
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- CN116289482A CN116289482A CN202310586856.0A CN202310586856A CN116289482A CN 116289482 A CN116289482 A CN 116289482A CN 202310586856 A CN202310586856 A CN 202310586856A CN 116289482 A CN116289482 A CN 116289482A
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- 238000010276 construction Methods 0.000 title claims abstract description 29
- 210000002435 tendon Anatomy 0.000 claims abstract description 16
- 239000011178 precast concrete Substances 0.000 claims description 41
- 238000005266 casting Methods 0.000 claims description 19
- 239000004567 concrete Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 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
- 239000010959 steel Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 11
- 238000009434 installation Methods 0.000 description 9
- 238000009417 prefabrication Methods 0.000 description 8
- 230000011218 segmentation Effects 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229920006335 epoxy glue Polymers 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 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
- 238000001727 in vivo Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D1/00—Bridges in general
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling 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
- E01D2101/28—Concrete reinforced prestressed
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Abstract
The invention discloses a segmented prefabricated assembled bridge and a construction method thereof, wherein the segmented prefabricated assembled bridge comprises a supporting mechanism and a prefabricated girder, the prefabricated girder is supported on the supporting mechanism, the supporting mechanism comprises a supporting column and a prefabricated capping beam, the prefabricated capping beam is arranged at the top of the supporting column, the prefabricated capping beam comprises four prefabricated beam segments which are distributed along the circumferential direction and are connected into a whole beam body with a block structure through cross wet joints, post-tensioned prestressing tendons distributed along the transverse bridge direction are embedded in the whole beam body with the block structure, the whole beam body with the block structure comprises two groups of prefabricated beam groups, each prefabricated beam group comprises two prefabricated beam segments, beam piece wet joints and segment wet joints are simultaneously poured and formed to form the cross wet joints, the beam piece wet joints are non-through high-humidity joints, and the segment wet joints are through high-humidity joints. According to the sectional prefabricated assembled bridge and the construction method thereof, the prefabricated beam sections are connected through the cross wet joints and the post-tensioning prestressed tendons to form the prefabricated bent cap, and the safety redundancy of the prefabricated bent cap is good.
Description
Technical Field
The invention relates to the technical field of bridge prefabrication and assembly, in particular to a segmented 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, the technology of segmented prefabrication and assembly of bridges is rapidly developed. The main process of the sectional prefabrication and assembly bridge is that prefabrication, component transportation and on-site hoisting are performed on pouring pile foundations and 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, hoisting equipment is needed to assist, the prestress is sequentially tensioned after gradual connection, 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 segmented prefabricated assembled bridge to solve or at least alleviate the above-mentioned drawbacks.
Disclosure of Invention
The invention mainly aims to provide a segmented prefabricated assembled bridge and a construction method thereof, and aims to solve the technical problems of poor connection strength between segments and low safety redundancy of a structure of the existing segmented prefabricated assembled construction bridge.
The invention provides a segmented prefabricated assembled bridge, which 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 capping beam, the prefabricated capping beam is arranged at the top of the supporting column, the prefabricated capping beam comprises four prefabricated beam sections, the four prefabricated beam sections are distributed along the circumferential direction and are connected into a whole beam body with a block structure through cross wet joints, post-tensioning prestressed tendons distributed along the transverse bridge direction are buried in the whole beam body with the block structure, the two groups of prefabricated beam groups are oppositely arranged along the transverse bridge direction and are connected through beam piece wet joints, each group of prefabricated beam groups is internally provided with post-tensioning prestressed tendons distributed along the transverse bridge direction, each prefabricated beam group comprises two prefabricated beam sections oppositely arranged along the transverse bridge direction, each prefabricated beam section is connected through a section wet joint, the post-tensioning prestressed tendons are arranged between the two prefabricated beam sections oppositely arranged along the transverse bridge direction, the beam piece wet joints and the wet joints are simultaneously molded to form the cross wet joints, and the beam piece wet joints are non-through high-pass wet joints.
Further, the precast beam segment includes precast concrete piece, forward direction tie bar row and transverse connection bar row, the transverse bridge of precast concrete piece is L shape to the cross-section shape, forward direction tie bar row is along setting up in the forward direction of bridge, forward direction tie bar row's first end buries in precast concrete piece, forward direction tie bar row's second end outwards extends and the protrusion sets up in precast concrete piece's inside wall face, transverse connection bar row sets up along the transverse bridge, transverse connection bar row's first end buries in precast concrete piece, transverse connection bar row's second end outwards extends and the protrusion sets up in precast concrete piece's terminal surface, precast concrete piece is equipped with along the prestressing force hole that the transverse bridge was laid, along the overhanging end interconnect of the precast beam segment that the forward direction tie bar row of forward direction tie bar was laid relatively, and buries in beam piece wet seam, along the overhanging end interconnect of the precast beam segment that the transverse bridge was laid relatively lay and buries in the segment wet seam, along the mutual intercommunication of the prestressing force hole of the precast beam segment that the transverse bridge was relative lay.
Further, the precast concrete piece includes vertical linkage segment and horizontal linkage segment, and the connection internal wall surface setting of horizontal linkage segment perpendicular to vertical linkage segment just is in the bottom of vertical linkage segment, and the bottom surface of horizontal linkage segment and the bottom surface parallel and level of vertical linkage segment lay, and the horizontal bridge of horizontal linkage segment and vertical linkage segment is laid to terminal surface parallel and level, and on vertical linkage segment was located to the first end of forward joint bar row, on vertical linkage segment and/or horizontal linkage segment was located to the first end of horizontal joint bar row, on vertical linkage segment and/or horizontal linkage segment was located to the prestressing force hole.
Further, the forward connecting rib row comprises a plurality of embedded forward connecting ribs which are distributed along the transverse bridge at intervals, the first ends of the embedded forward connecting ribs are buried in the precast concrete blocks, the second ends of the embedded forward connecting ribs extend outwards and protrude out of the connecting inner wall surfaces of the precast concrete blocks, the embedded forward connecting ribs are u-shaped ribs, the opening ends of the embedded forward connecting ribs are buried in the precast concrete blocks, the closed ends of the embedded forward connecting ribs protrude out of the inner wall surfaces of the precast concrete blocks, the overhanging ends of the embedded forward connecting ribs of the precast beam sections which are distributed oppositely along the transverse bridge are distributed in a staggered mode transversely and are connected to form whole-ring connecting ribs, the whole-ring connecting ribs are buried in beam piece wet joints, and connecting main ribs distributed along the transverse bridge are arranged in the whole-ring connecting rib structure.
Further, the transverse connecting rib row comprises a plurality of embedded transverse connecting ribs which are distributed at intervals, the embedded transverse connecting ribs are straight ribs, and the overhanging ends of the embedded transverse connecting ribs of the precast beam segments distributed along the transverse bridge direction are mutually connected and embedded in the wet joints of the segments.
Further, the bridge-wise dimension of the beam sheet wet seam is 30 to 50 cm, and the dimension of the segment wet seam along the transverse bridge direction is 0.8-1.5 m.
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 segmented 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, constructing 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, pre-positioning the four precast beam segments on the precast pier column and the non-floor stand in a hoisting manner;
s33, constructing joints of precast beam segments and corresponding precast pier columns, enabling four precast beam segments to be distributed and assembled on the corresponding precast pier columns along the circumferential direction, wherein pouring grooves for forming beam piece wet joints and segment channels for forming segment wet joints are formed among the four precast beam segments, and the pouring grooves and the segment channels are vertically arranged in an inertial mode;
s34, the overhanging ends of the embedded forward connecting ribs of the precast beam segments which are oppositely arranged along the forward bridge direction are connected with each other, so that a whole-ring connecting rib structure body is formed in the pouring groove, and a connecting main rib is arranged in the whole-ring connecting rib structure body; the overhanging ends of the embedded transverse connecting ribs of the precast beam segments distributed along the transverse bridge direction are connected with each other so as to form horizontal connecting ribs in the segment channels; the four cover precast bent caps are connected with each other, and prestress holes of precast beam sections which are oppositely distributed along the transverse bridge direction are mutually communicated, so that a bent cap primary blank is formed;
s35, erecting templates, plugging splicing joints at the bottom of the pouring groove by using a sealing body, erecting templates at two ends of a transverse bridge of a primary blank of the capping beam, erecting templates at two sides of the middle of the primary blank of the capping beam along the bridge, and forming a cross pouring groove with an opening at the top in the primary blank of the capping beam;
s36, casting concrete in the cross casting groove to form a cross wet joint;
s37, after the strength of the concrete of the cross wet joint is formed, the prestressed tendons are post-tensioned between two precast beam segments distributed along the transverse bridge direction through the prestressed holes.
Compared with the prior art, the segmented prefabricated assembled bridge has the following beneficial effects:
the segmented 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 four prefabricated beam segments on site, so that the technical problem that the existing bridge is difficult to apply to an integral bent cap due to the limitation of road transportation along a line and on-site hoisting conditions is solved; the prefabricated capping beam comprises two groups of prefabricated beam groups connected along the forward bridge direction, the prefabricated beam groups comprise two prefabricated beam sections oppositely arranged along the transverse bridge direction, the prefabricated beam groups are connected through beam piece wet joints, the prefabricated beam sections are connected through section wet joints, the beam piece wet joints and the section wet joints are simultaneously cast and formed, the four prefabricated beam sections are connected to form a block-shaped structure whole Liang Tishi by applying cross-shaped wet joints, only a side template is required to be erected, a bottom die (a non-through high-humidity joint is formed) is not required to be applied at the bottom of the prefabricated beam, and after one-time casting and forming connection, a post-tensioning prestressed rib is tensioned between the prefabricated beam sections arranged along the transverse bridge direction, so that the construction process is simple; meanwhile, when the prefabricated pier column of the support column is constructed, the installation errors between the prefabricated pier column and the cast-in-situ bearing platform and the installation errors between the prefabricated capping beam and the prefabricated pier column can be accumulated to the middle section wet joint, and the section wet joint is adopted as a high-humidity joint process, so that the installation errors can be effectively eliminated; the four precast beam sections are connected through the cross-shaped wet joints and the post-tensioning prestressed tendons, the cross-shaped wet joints connect the four precast beam sections into a whole, load transmitted by the bridge upper structure is borne together, and the safety redundancy of the structure is good.
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 view of a partial perspective view of a segmented prefabricated assembled bridge according to one embodiment of the present invention;
FIG. 2 is a schematic perspective view of a prefabricated capping beam according to an embodiment of the present invention;
FIG. 3 is an enlarged view of FIG. 1 at A;
fig. 4 is a schematic perspective view of a precast beam segment in one embodiment of the present invention.
Legend description:
100. sectional prefabrication and assembly bridge; 1. a support mechanism; 10. a support column; 20. prefabricating a cover beam; 21. prefabricating beam sections; 211. prefabricating concrete blocks; 212. a forward connecting rib row; 213. transverse connecting rib rows; 22. a cross wet seam; 221. wet seam of beam sheet; 222. segment wet seam.
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 and 4, the invention provides a segmented prefabricated assembled bridge, which 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 capping beam, the prefabricated capping beam is arranged at the top of the supporting column, the prefabricated capping beam comprises four prefabricated beam segments, the four prefabricated beam segments are distributed along the circumferential direction and are connected into a whole block-shaped structure beam body through cross wet joints, post-tensioning prestressed tendons distributed along the transverse bridge direction are embedded in the whole block-shaped structure beam body, the whole block-shaped structure beam body comprises two groups of prefabricated beam groups which are oppositely arranged along the transverse bridge direction, the two groups of prefabricated beam groups are connected through beam piece wet joints, each group of prefabricated beam groups is internally provided with post-tensioning prestressed tendons distributed along the transverse bridge direction, the two prefabricated beam segments are connected through the segment wet joints, the two beam piece wet joints and the two beam segments are oppositely arranged along the transverse bridge direction are provided with post-tensioning prestressed tendons, the beam piece wet joints and the beam piece wet joints are simultaneously poured into the whole block-shaped structure beam body, and the cross wet joints are non-passing wet joints, and the wet joints are high-passing wet joints.
The segmented 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 four prefabricated beam segments on site, so that the technical problem that the existing bridge is difficult to apply as an integral bent cap due to the limitation of road transportation along a line and on-site hoisting conditions is solved; the prefabricated capping beam comprises two groups of prefabricated beam groups connected along the forward bridge direction, the prefabricated beam groups comprise two prefabricated beam sections oppositely arranged along the transverse bridge direction, the prefabricated beam groups are connected through beam piece wet joints, the prefabricated beam sections are connected through section wet joints, the beam piece wet joints and the section wet joints are simultaneously cast and formed, the four prefabricated beam sections are connected to form a block-shaped structure whole Liang Tishi by applying cross-shaped wet joints, only a side template is required to be erected, a bottom die (a non-through high-humidity joint is formed) is not required to be applied at the bottom of the prefabricated beam, and after one-time casting and forming connection, a post-tensioning prestressed rib is tensioned between the prefabricated beam sections arranged along the transverse bridge direction, so that the construction process is simple; meanwhile, when the prefabricated pier column of the support column is constructed, the installation errors between the prefabricated pier column and the cast-in-situ bearing platform and the installation errors between the prefabricated capping beam and the prefabricated pier column can be accumulated to the middle section wet joint, and the section wet joint is adopted as a high-humidity joint process, so that the installation errors can be effectively eliminated; the four precast beam sections are connected through the cross-shaped wet joints and the post-tensioning prestressed tendons, the cross-shaped wet joints connect the four precast beam sections into a whole, load transmitted by the bridge upper structure is borne together, and the safety redundancy of the structure is good.
It can be understood that the bridge is assembled in a sectional prefabrication mode by adopting transverse sectional and longitudinal sectional modes, the precast beam sections are arranged in a pairwise mode, after the precast beam sections are connected with the corresponding support columns, the exposed connecting ribs of the corresponding precast beam sections are connected with each other to form a capping beam primary blank, and at the moment, the bottom splicing seam of the capping beam primary blank is plugged through a sealing body. It will be appreciated that the seal is made of epoxy glue or grout, and the bottom splice seam is closed by using epoxy glue or grout in the present invention.
Further, the precast beam segment includes precast concrete piece, forward connecting rib row and transverse connecting rib row, the transverse bridge of precast concrete piece is L shape to the cross-section shape, forward connecting rib row is along setting up in the forward direction of bridge, forward connecting rib row's first end buries in precast concrete piece, forward connecting rib row's second end (overhanging end) outwards extends and the protrusion is set up in precast concrete piece's inside wall face, transverse connecting rib row is along transverse bridge setting up, transverse connecting rib row's first end buries in precast concrete piece, transverse connecting rib row's second end (overhanging end) outwards extends and the protrusion is set up in precast concrete piece's terminal surface, precast concrete piece is equipped with along transverse bridge to lay prestressing force hole, along the overhanging end interconnect of the precast beam segment of forward connecting rib row of forward opposite arrangement of forward direction of bridge and buries in beam piece wet seam, along transverse bridge opposite arrangement's overhanging end interconnect and buries in the segment wet seam, along transverse bridge opposite arrangement's precast beam segment prestressing force intercommunication each other. The beam piece wet joint is a non-through high-humidity joint, the cross section of the transverse bridge direction of the prefabricated concrete blocks is L-shaped, the four prefabricated concrete blocks are arranged along the peripheral direction to form a bottom joint, and the beam piece wet joint can be applied after the bottom joint is plugged, so that the construction process is simple.
Further, precast concrete piece includes vertical linkage segment and horizontal linkage segment, horizontal linkage segment perpendicular to the connection internal face setting of vertical linkage segment just is in the bottom of vertical linkage segment, the bottom surface of horizontal linkage segment with the bottom surface parallel and level of vertical linkage segment is laid, horizontal linkage segment with the horizontal bridge of vertical linkage segment is to terminal surface parallel and level layout, the first end of forward tie bar row is located on the vertical linkage segment, the first end of horizontal tie bar row is located vertical linkage segment and/or on the horizontal linkage segment, the prestressing force hole is located vertical linkage segment and/or on the horizontal linkage segment. It can be understood that the second end of the embedded forward connecting rib extends outwards and protrudes out of the connecting inner wall surface of the precast concrete segment to form an L-shaped precast concrete segment.
Further, the forward connecting rib row comprises a plurality of embedded forward connecting ribs which are distributed along the transverse bridge at intervals, the first ends of the embedded forward connecting ribs are buried in the precast concrete blocks, the second ends of the embedded forward connecting ribs extend outwards and protrude out of the connecting inner wall surfaces of the precast concrete blocks, the embedded forward connecting ribs are u-shaped ribs, the opening ends of the embedded forward connecting ribs are buried in the precast concrete blocks, the closed ends of the embedded forward connecting ribs protrude out of the inner wall surfaces of the precast concrete blocks, the overhanging ends of the embedded forward connecting ribs of the precast beam sections which are distributed oppositely along the transverse bridge are distributed in a staggered mode transversely and are connected to form whole-ring connecting ribs, the whole-ring connecting ribs are buried in beam piece wet joints, and connecting main ribs distributed along the transverse bridge are arranged in the whole-ring connecting rib structure.
More preferably, 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 sheet, so that two embedded forward connecting ribs arranged oppositely are connected to form a whole-ring connecting rib, the construction is simple, the equivalent anchoring length is achieved, and the continuity and the integrity of the prefabricated capping beam are maintained.
More preferably, the vertical connecting section 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. The bearing performance of the structure body is ensured when the weight of the precast concrete segments is reduced.
More preferably, a plurality of pre-buried forward connecting ribs close to the upper edge of precast concrete piece set up form the connecting rib row along the interval arrangement of horizontal bridge to, and a plurality of pre-buried forward connecting ribs close to the lower edge of precast concrete piece set up form the connecting rib row down along the interval arrangement of horizontal bridge to, through setting up two rows of forward connecting rib rows, establish the connection owner muscle through the full ring connecting rib structure that forms in each row of forward connecting rib row in vivo, guarantee that the bearing capacity of the wet seam of roof beam piece of precast bent cap does not weaken. It can be understood that the U-shaped ribs are reserved on the inner side surface of the precast beam segment, the U-shaped ribs of the front precast beam segment and the rear precast beam segment are staggered by a distance equal to the diameter of the reinforcing steel bar, the U-shaped ribs of the front precast beam segment and the rear precast beam segment form a lantern ring after being hoisted in place, the main ribs are inserted into the lantern ring, and the bearing capacity of the beam piece wet joint of the precast cap beam is guaranteed not to be weakened.
Further, the transverse connecting rib row comprises a plurality of embedded transverse connecting ribs which are distributed at intervals, the embedded transverse connecting ribs are straight ribs, and the overhanging ends of the embedded transverse connecting ribs of the precast beam segments distributed along the transverse bridge direction are mutually connected and embedded in the wet joints of the segments. More preferably, the embedded transverse connecting ribs arranged along the transverse bridge direction are connected through sleeves. Through setting up the wet seam of festival section for leading to high wet seam, through setting up the pre-buried transverse connection muscle that sets up along the transverse bridge to pass through telescopic connection, when guaranteeing that bearing capacity does not weaken, be convenient for construct and connect two precast beam connections of laying along the transverse bridge.
Further, in order to reduce the interference of installation errors and ensure the bearing capacity performance of the prefabricated capping beam, the forward bridge direction dimension of the beam sheet wet joint is 30-50 cm, and the transverse bridge direction dimension of the segment wet joint is 0.8-1.5 m. Alternatively, the wet seam of the beam sheet can be 30 cm in the groove diameter along the forward bridge direction, and can also be 35 cm or 45 cm in other dimensions; the size of the segmental wet joints along the transverse bridge direction can be 1 meter, or can be 1.3 meters or 1.4 meters and other sizes.
In the invention, the wet joint of the segment is 30-50 cm, the bottom die is not needed, the wet joint of the segment is 0.8-1.5 m, and the casting molding is convenient for casting construction.
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 0 comprises a pouring pile foundation, a pouring bearing platform and a prefabricated pier stud, the pouring bearing platform is arranged on the pouring pile foundation, the prefabricated pier stud is arranged on the pouring bearing platform, and the prefabricated capping beam is arranged on the prefabricated pier stud.
More preferably, the number of the support columns is two, and two precast beam segments arranged along the transverse bridge direction are erected on one support column.
The segmented prefabricated assembled bridge provided by the invention has the following beneficial effects:
the section wet joints (high-humidity joint) between the transverse sections can adapt to the height installation errors of the precast beam sections on the left side and the right side, the pre-buried transverse connecting ribs between the transversely connected precast beam sections are connected through sleeves, the forward bridge dimension of the beam piece wet joints is 30-50 cm, and the arrangement of the prestressed ribs is not influenced; the overhanging ends of the embedded forward connecting ribs of the precast beam segments which are oppositely arranged along the forward bridge direction are transversely arranged in a staggered manner and connected to form a whole-ring connecting rib, the whole-ring connecting rib is embedded in the wet joint of the beam piece, and a connecting main rib arranged along the transverse bridge direction is arranged in the whole-ring connecting rib structure; the cross-shaped wet joint is formed by the transverse segmentation and the longitudinal segmentation, the prefabricated capping beam has good integrity, the safety redundancy of the structure is higher, and the prefabricated capping beam jointly bears the load transmitted by the upper structure of the bridge; by adopting the transverse segmentation and longitudinal segmentation method, the large bent cap of 400 tons to 500 tons can be divided into prefabricated parts with the weight of about 100 tons, and the method is particularly suitable for constructing bridges in downtown areas limited by road transportation along the line and on-site hoisting conditions.
The invention also provides a construction method of the segmented 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 on the prefabricated pier stud;
s40, constructing 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, pre-positioning the four precast beam segments on the precast pier column and the non-floor stand in a hoisting manner;
s33, constructing joints of precast beam segments and corresponding precast pier columns, enabling four precast beam segments to be distributed and assembled on the corresponding precast pier columns along the circumferential direction, wherein pouring grooves for forming beam piece wet joints and segment channels for forming segment wet joints are formed among the four precast beam segments, and the pouring grooves and the segment channels are vertically arranged in an inertial mode;
s34, the overhanging ends of the embedded forward connecting ribs of the precast beam segments which are oppositely arranged along the forward bridge direction are connected with each other, so that a whole-ring connecting rib structure body is formed in the pouring groove, and a connecting main rib is arranged in the whole-ring connecting rib structure body; the overhanging ends of the embedded transverse connecting ribs of the precast beam segments distributed along the transverse bridge direction are connected with each other so as to form horizontal connecting ribs in the segment channels; the four cover precast bent caps are connected with each other, and prestress holes of precast beam sections which are oppositely distributed along the transverse bridge direction are mutually communicated, so that a bent cap primary blank is formed;
s35, erecting templates, plugging splicing joints at the bottom of the pouring groove by using a sealing body, erecting templates at two ends of a transverse bridge of a primary blank of the capping beam, erecting templates at two sides of the middle of the primary blank of the capping beam along the bridge, and forming a cross pouring groove with an opening at the top in the primary blank of the capping beam;
s36, casting concrete in the cross casting groove to form a cross wet joint;
s37, after the strength of the concrete of the cross wet joint is formed, the prestressed tendons are post-tensioned between two precast beam segments distributed along the transverse bridge direction through the prestressed holes.
Specifically, in step S34, the pre-buried forward connecting ribs of the precast beam segments arranged along the forward bridge are staggered by one reinforcing bar along the transverse bridge, so that a full-ring connecting rib structure is formed after connection.
According to the construction method for the segmented prefabricated assembled bridge, when the large bent cap is under the constraint environment 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 four prefabricated beam segments for transportation and assembly, transportation and hoisting are facilitated, the four prefabricated beam segments are preassembled under the auxiliary effect of a floor support, are connected to support columns and are communicated with each other along a transverse bridge to opposite prestress holes (the two opposite prefabricated beam segments possibly have a height installation error of less than 2 cm along the transverse bridge), and then main ribs are installed in a first whole ring connecting rib structure; the cast-in-situ cross wet joints are formed to connect the precast beam segments, the construction is convenient, the main rib is inserted into the whole ring connecting rib structure body, the bearing capacity of the bent cap along the bridge to the wet joints is not weakened, and the safety redundancy of the structure is high.
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 segmented 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 prefabricated capping beam comprises four prefabricated beam sections, the four prefabricated beam sections are distributed along the circumferential direction and are connected into a whole beam body with a block structure through cross wet joints, post-tensioned prestressing tendons distributed along the transverse bridge direction are buried in the whole beam body with the block structure,
the whole beam body of the block structure comprises two groups of precast beam groups which are oppositely arranged along the along-bridge direction, the two groups of precast beam groups are connected through beam piece wet joints, each group of precast beam groups is internally provided with post-tensioning prestressed tendons which are distributed along the transverse-bridge direction,
the precast beam group comprises two precast beam sections which are oppositely arranged along the transverse bridge direction, the two precast beam sections are connected through a section wet joint, the post-tensioning prestressed tendons are arranged between the two precast beam sections which are oppositely arranged along the transverse bridge direction,
the beam sheet wet joint and the section wet joint are simultaneously cast and formed to form the cross wet joint, the beam sheet wet joint is a non-through high-humidity joint, and the section wet joint is a through high-humidity joint.
2. The segmented prefabricated assembled bridge according to claim 1, wherein,
the precast beam segment comprises precast concrete blocks, forward connecting rib rows and transverse connecting rib rows, the transverse cross section of the precast concrete blocks is L-shaped, the forward connecting rib rows are arranged along the forward direction of the bridge, the first ends of the forward connecting rib rows are buried in the precast concrete blocks, the second ends of the forward connecting rib rows extend outwards and protrude out of the inner side wall surfaces of the precast concrete blocks, the transverse connecting rib rows are arranged along the transverse direction of the bridge, the first ends of the transverse connecting rib rows are buried in the precast concrete blocks, the second ends of the transverse connecting rib rows extend outwards and protrude out of the end surfaces of the precast concrete blocks, the precast concrete blocks are provided with the prestress holes distributed along the transverse direction of the bridge,
the overhanging ends of the forward connecting rib rows of the precast beam segments which are oppositely arranged along the forward bridge direction are mutually connected and buried in the beam piece wet joints, the overhanging ends of the transverse connecting rib rows of the precast beam segments which are oppositely arranged along the transverse bridge direction are mutually connected and buried in the segment wet joints, and the prestress holes of the precast beam segments which are oppositely arranged along the transverse bridge direction are mutually communicated.
3. The segmented prefabricated assembled bridge according to claim 2, wherein,
the precast concrete piece includes vertical linkage segment and horizontal linkage segment, horizontal linkage segment perpendicular to the connection internal face setting of vertical linkage segment just is in the bottom of vertical linkage segment, the bottom surface of horizontal linkage segment with the bottom surface parallel and level of vertical linkage segment is laid, horizontal linkage segment with the horizontal bridge of vertical linkage segment is laid to terminal surface parallel and level, the first end that forward joint bar was arranged is located on the vertical linkage segment, the first end that horizontal joint bar was arranged is located vertical linkage segment and/or on the horizontal linkage segment, the prestressing force hole is located vertical linkage segment and/or on the horizontal linkage segment.
4. The segmented prefabricated assembled bridge according to claim 2, wherein,
the forward connecting rib row comprises a plurality of embedded forward connecting ribs which are distributed at intervals along the transverse bridge direction, the first ends of the embedded forward connecting ribs are embedded in the precast concrete blocks, the second ends of the embedded forward connecting ribs extend outwards and protrude out of the connecting inner wall surface of the precast concrete blocks,
the embedded forward connecting rib is a u-shaped rib, the opening end of the embedded forward connecting rib is embedded in the precast concrete block, the closed end of the embedded forward connecting rib protrudes out of the inner wall surface of the precast concrete block,
the overhanging ends of the embedded forward connecting ribs of the precast beam segments which are oppositely distributed along the forward bridge are transversely arranged in a staggered mode and are connected to form a whole-ring connecting rib, the whole-ring connecting rib is embedded in the wet joint of the beam piece, and a connecting main rib distributed along the transverse bridge direction is arranged in the whole-ring connecting rib structure.
5. The segmented prefabricated assembled bridge according to claim 2, wherein,
the transverse connecting rib row comprises a plurality of embedded transverse connecting ribs which are distributed at intervals, the embedded transverse connecting ribs are straight ribs,
the overhanging ends of the embedded transverse connecting ribs of the precast beam segments distributed along the transverse bridge direction are mutually connected and embedded in the wet joints of the segments.
6. The segmented prefabricated assembled bridge according to claim 2, wherein,
the bridge-wise dimension of the beam sheet wet seam is 30 to 50 cm, and the dimension of the segment wet seam along the transverse bridge direction is 0.8-1.5 m.
7. The segmented prefabricated assembled bridge according to any one of claims 2 to 6,
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 2 to 6,
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 2 to 6,
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. The construction method of the segmented prefabricated assembled bridge is characterized by comprising the following steps of:
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, applying 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, pre-positioning the four precast beam segments on the precast pier column and the floor stand in a hoisting mode;
s33, constructing joints of the precast beam segments and the corresponding precast pier columns, enabling four precast beam segments to be distributed and assembled on the corresponding precast pier columns along the circumferential direction, and forming pouring grooves for forming beam sheet wet joints and segment channels for forming segment wet joints between the four precast beam segments, wherein the pouring grooves and the segment channels are vertically and mutually arranged;
s34, the overhanging ends of the embedded forward connecting ribs of the precast beam segments which are oppositely arranged along the forward bridge direction are mutually connected, so that a whole-ring connecting rib structure body is formed in the pouring groove, and connecting main ribs are arranged in the whole-ring connecting rib structure body; the overhanging ends of the embedded transverse connecting ribs of the precast beam segments distributed along the transverse bridge direction are connected with each other so as to form horizontal connecting ribs in the segment channels; the four prefabricated cover beams are connected with each other and the prestress holes of the prefabricated beam sections which are oppositely distributed along the transverse bridge direction are mutually communicated, so that a cover beam primary blank is formed;
s35, erecting templates, plugging splicing seams at the bottom of the pouring groove by using a sealing body, erecting templates at two ends of a transverse bridge of the bent cap primary blank, erecting templates at two sides of the middle of the bent cap primary blank along the bridge, and forming a cross pouring groove with an opening at the top in the bent cap primary blank;
s36, casting concrete in the cross casting groove to form a cross wet joint;
and S37, after the strength of the concrete of the cross wet joint is formed, stretching the prestressed tendons between the two precast beam segments distributed along the transverse bridge direction through the prestressed holes.
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