CN110565510B - Prefabricated assembled segmental pier structure and construction method thereof - Google Patents
Prefabricated assembled segmental pier structure and construction method thereof Download PDFInfo
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- CN110565510B CN110565510B CN201910872310.5A CN201910872310A CN110565510B CN 110565510 B CN110565510 B CN 110565510B CN 201910872310 A CN201910872310 A CN 201910872310A CN 110565510 B CN110565510 B CN 110565510B
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- 238000010276 construction Methods 0.000 title claims abstract description 74
- 238000011065 in-situ storage Methods 0.000 claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims description 85
- 239000010959 steel Substances 0.000 claims description 85
- 239000004567 concrete Substances 0.000 claims description 31
- 238000009417 prefabrication Methods 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000011372 high-strength concrete Substances 0.000 description 4
- 210000001503 joint Anatomy 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- 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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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a prefabricated assembly segment pier structure and a construction method, wherein the standardization, industrialization and assembly of the construction process are realized by prefabricating an upper segment pier, a lower segment pier and other accessory components in a factory; the large bridge pier is prefabricated in sections, so that the large prefabricated construction is realized, the rapid construction requirement of the high pier bridge can be met, the construction period is greatly shortened, the engineering quality is improved, and the adverse effects on urban traffic and environment in the construction process are reduced; the cast-in-situ bearing platform is provided with a bearing platform reserved groove, so that the positioning during the hanging of the lower-section prefabricated bridge pier is facilitated during the assembly; the lower section pier groove is formed in the lower section prefabricated pier, the upper section pier convex strip is arranged on the upper section prefabricated pier, the lower section pier convex strip and the upper section pier convex strip form a mortise-tenon-like structure, accurate positioning is convenient to achieve during hoisting, construction difficulty is greatly reduced, construction efficiency is greatly improved, and construction period is shortened.
Description
Technical Field
The invention belongs to the field of bridge engineering, and particularly relates to a prefabricated assembly segment pier structure and a construction method.
Background
With the rapid development of China economic society, urban traffic is increasingly heavy, and the construction period is long due to the fact that the construction period is long and urban traffic is seriously influenced by a method for constructing bridges by adopting traditional construction modes such as bracket cast-in-situ and the like due to the fact that concrete age is long. The prefabricated bridge can furthest reduce the interference to the existing traffic, greatly improve the construction safety, reduce the pollution to the environment of a construction site, remarkably accelerate the construction progress and provide great convenience for the maintenance and replacement of bridge components in the later period. The prefabrication and assembly technology of the bridge superstructure and the bridge deck system structure in China tend to be mature, while the prefabrication and assembly technology of the bridge substructure, particularly the higher bridge pier, is less, and is only applied to some cross-sea bridge gravity type bridge piers.
At present, some city bridges are constructed in a factory prefabrication and field hoisting mode. However, most of the construction method is only aimed at the whole bridge pier, and the bridge pier size is limited by transportation means and hoisting machinery, so that some high bridge piers cannot be prefabricated in a factory, the period of the bridge is too long during construction, and the urban traffic and environment are greatly influenced. At present, a small number of segmental pier prefabrication methods exist, but the accurate butt joint of the segmental pier prefabrication methods is difficult to achieve when piers are assembled, so that the construction difficulty is increased, the working efficiency is reduced, and the construction period is prolonged.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the prefabricated assembled segmental pier structure and the construction method, which can realize accurate butt joint when piers are assembled, reduce construction difficulty, improve construction efficiency and shorten the construction period of bridges.
The invention is realized by the following technical scheme:
The prefabricated assembly segment pier structure comprises an upper segment of prefabricated pier, a lower segment of prefabricated pier and a cast-in-situ bearing platform;
The upper surface of the cast-in-situ bearing platform is provided with a bearing platform reserved groove, and when the cast-in-situ bearing platform is assembled, the lower part of the lower section of the prefabricated pier is arranged in the bearing platform reserved groove for fixing;
The upper part of the lower-section prefabricated pier is of a hollow structure, and a step is formed on the inner side of the lower-section prefabricated pier; the lower section of the bridge pier transverse bridge is longitudinally provided with a lower section of bridge pier groove towards the upper part of the side surface, the upper end surface of the lower section of bridge pier groove is level with the upper end surface of the lower section of bridge pier, the lower end surface of the lower section of bridge pier groove is level with the step surface of the step on the inner side of the lower section of bridge pier, and the lower section of bridge pier groove is communicated with the hollow structure on the upper part of the lower section of bridge pier; the upper section prefabricated bridge pier is arranged in a variable cross section from top to bottom, the cross section area of the upper part of the upper section prefabricated bridge pier is larger than that of the lower part of the upper section prefabricated bridge pier, and a step is formed at the periphery of the upper section prefabricated bridge pier; an upper section bridge pier convex strip is longitudinally arranged at the lower part of the lateral surface of the upper section bridge pier transverse bridge, the upper end surface of the upper section bridge pier convex strip is overlapped with the step surface of the peripheral step of the upper section bridge pier, the lower end surface of the upper section bridge pier convex strip is level with the lower end surface of the upper section bridge pier, and the upper section bridge pier convex strip is matched with the lower section bridge pier groove; during assembly, the lower part of the upper section of the prefabricated bridge pier is inserted into the upper hollow structure of the lower section of the prefabricated bridge pier, the convex strip of the upper section of the bridge pier is inserted into the groove of the lower section of the bridge pier, the bottom of the upper section of the prefabricated bridge pier is arranged on the step on the inner side of the lower section of the prefabricated bridge pier to be fixed, and the step surface of the upper step of the upper section of the prefabricated bridge pier is arranged on the top end surface of the lower section of the prefabricated bridge pier.
Preferably, the lower section of the prefabricated pier is provided with a lower section of the pier steel plate hoop in a pre-buried mode, and the outer surface of the lower section of the pier steel plate hoop is provided with a first shear pin; the cross section of the reserved groove of the bearing platform is gradually increased from bottom to top, the bottom surface of the reserved groove of the bearing platform is the same as the bottom surface of the lower-section prefabricated pier in size, and when the prefabricated pier is assembled, concrete is poured into a gap between the cast-in-situ bearing platform and the lower-section prefabricated pier after the lower part of the lower-section prefabricated pier is arranged in the reserved groove of the bearing platform.
Preferably, the lower section of the prefabricated pier is provided with a lower section of the pier steel plate hoop in a pre-buried manner, and the upper outer surface of the lower section of the pier steel plate hoop is provided with a lower section of the pier pre-buried steel plate; the top of the cast-in-situ bearing platform is provided with bearing platform embedded steel plates which are arranged in one-to-one correspondence with the lower bridge pier embedded steel plates; when the lower-section pre-cast bridge pier is assembled, the lower-section pre-cast bridge pier is arranged in the bearing platform pre-groove, the lower-section pre-cast bridge pier steel plate is arranged above the cast-in-situ bearing platform, and the bearing platform pre-cast steel plate is connected with the lower-section pre-cast bridge pier steel plate through bolts.
Preferably, the lower-section bridge pier bulge is arranged on the lateral side of the lower-section bridge pier, the lower-section bridge pier bulge is longitudinally arranged and extends from the top of the lower-section bridge pier to the position where the lower-section bridge pier is flush with the upper surface of the cast-in-situ bearing platform, and the upper part of the lower-section bridge pier bulge is arranged in a convex groove structure to form a lower-section bridge pier groove; the upper section precast bridge pier transverse bridge is provided with an upper section bridge pier bulge towards the side surface, the upper section bridge pier bulge is longitudinally arranged and extends to the bottom of the upper section precast bridge pier from the top of the upper section precast bridge pier, and the lower section of the upper section bridge pier bulge is variable in cross section to form an upper section bridge pier convex strip.
Preferably, the outer contour of the lower part of the upper-section prefabricated pier is smaller than the inner contour of the upper part of the lower-section prefabricated pier; the lower part of the upper section of prefabricated pier is pre-embedded with an upper section of pier steel plate hoop, and the outer surface of the upper section of pier steel plate hoop is provided with a second shear pin; the upper part of the lower joint precast pier is provided with a grouting opening and an exhaust hole, and the position of the exhaust hole is higher than the grouting opening; during assembly, after the lower part of the upper section precast pier is inserted into the upper hollow structure of the lower section precast pier, concrete is injected from the grouting opening.
Preferably, the grouting opening is arranged on the large pile number side of the lower-section prefabricated pier, and the exhaust hole is arranged on the small pile number side of the lower-section prefabricated pier.
Preferably, the top of the upper section prefabricated bridge pier is provided with a capping beam, and the upper section prefabricated bridge pier and the capping beam are arranged in an integrated structure.
Preferably, the upper-section prefabricated bridge pier is of a hollow structure; the lower part of the lower-section prefabricated pier is of a hollow structure, the lower-section prefabricated pier is of a variable cross-section structure from top to bottom, and a step is formed between the upper part and the lower part of the lower-section prefabricated pier.
The construction method of the prefabricated assembled segment pier structure comprises the steps of prefabricating an upper segment prefabricated pier and a lower segment prefabricated pier in a prefabrication factory, casting a cast-in-situ bearing platform in a construction site, transporting the upper segment prefabricated pier and the lower segment prefabricated pier to the construction site, positioning through a bearing platform reserved groove of the cast-in-situ bearing platform, hanging the lower segment prefabricated pier into the bearing platform reserved groove of the cast-in-situ bearing platform, connecting and fixing the lower segment prefabricated pier, positioning through an upper segment pier convex strip and a lower segment pier groove, hanging the upper segment prefabricated pier, enabling the lower part of the upper segment prefabricated pier to be inserted into an upper hollow structure of the lower segment prefabricated pier, and enabling the upper segment pier convex strip to be inserted into the lower segment pier groove.
Preferably, in the prefabricated assembly segment pier structure, a lower segment pier steel plate hoop is pre-buried at the lower part of the lower segment prefabricated pier, and a first shear nail is arranged at the outer surface of the lower part of the lower segment pier steel plate hoop; the cross section of the reserved groove of the bearing platform is gradually increased from bottom to top, and the bottom surface of the reserved groove of the bearing platform is the same as the bottom surface of the lower-section prefabricated pier in size; the outer contour of the lower part of the upper-section prefabricated pier is smaller than the inner contour of the upper part of the lower-section prefabricated pier; the lower part of the upper section of prefabricated pier is pre-embedded with an upper section of pier steel plate hoop, and the outer surface of the upper section of pier steel plate hoop is provided with a second shear pin; the upper part of the lower joint precast pier is provided with a grouting opening and an exhaust hole, and the position of the exhaust hole is higher than the grouting opening;
the specific construction method comprises the following steps:
Step one, prefabricating an upper section prefabricating pier and a lower section prefabricating pier in a factory through a special template;
secondly, casting a cast-in-situ bearing platform by adopting cast-in-situ concrete on a construction site;
Hoisting the prefabricated lower-section prefabricated bridge pier to the upper part of the cast-in-situ bearing platform, and falling after positioning is finished until the bottom of the lower-section prefabricated bridge pier contacts the bottom surface of the bearing platform reserved groove;
Step four, filling concrete in a gap between the cast-in-situ bearing platform and the lower-section prefabricated pier;
and fifthly, after the cast-in-place concrete of the cast-in-place bearing platform reaches 80% of the design strength, hoisting the upper-section prefabricated bridge pier above the lower-section prefabricated bridge pier, and after the upper-section bridge pier convex strip and the lower-section bridge pier groove are accurately butted, descending the upper-section prefabricated bridge pier until the part below the step of the upper-section prefabricated bridge pier completely enters the hollow structure at the upper part of the lower-section prefabricated bridge pier.
And step six, pouring concrete from the grouting opening of the precast pier of the lower section until the concrete flows out from the vent hole and the consistency of the concrete flows out reaches the consistency of the pouring.
Compared with the prior art, the invention has the following beneficial technical effects:
The invention realizes standardization, industrialization and assembly of the construction process by prefabricating the upper and lower precast bridge piers and other accessory components in the factory. By carrying out sectional prefabrication on the large pier, the large-scale prefabrication construction is realized, the rapid construction requirement of the high pier bridge can be met, the construction period is greatly shortened, the engineering quality is improved, and the adverse effects on urban traffic and environment in the construction process are reduced. The cast-in-situ bearing platform is provided with a bearing platform reserved groove, so that the positioning during the hanging of the lower-section prefabricated bridge pier is facilitated during the assembly; the lower section pier groove is formed in the lower section prefabricated pier, the upper section pier convex strip is arranged on the upper section prefabricated pier, the lower section pier convex strip and the upper section pier convex strip form a mortise-tenon-like structure, accurate positioning is convenient to achieve during hoisting, construction difficulty is greatly reduced, construction efficiency is greatly improved, and construction period is shortened.
Further, the reserved groove of the bearing platform is arranged in a mode that the cross section of the reserved groove of the bearing platform is gradually increased from bottom to top, so that a gap is formed between the cast-in-situ bearing platform and the lower-section precast pier, concrete can be injected into the gap, and meanwhile, shear nails are arranged at the lower part of the lower-section precast pier, so that a wet connection mode is adopted, and the cast-in-situ bearing platform and the lower-section precast pier are more firmly and reliably connected.
Furthermore, the cast-in-situ bearing platform is connected with the lower-section precast pier through the steel plate, so that the connection reliability of the lower-section precast pier and the cast-in-situ bearing platform is ensured, and meanwhile, the pier bottom is ensured to have enough compression resistance, bending resistance, shearing resistance and ductile shock resistance.
Further, the transverse bridge of the upper section of the prefabricated pier is protruded from the top capping beam to the pier bottom, and corresponds to the convex groove of the lower section of the prefabricated pier, so that the integrity and the aesthetic property of the pier are ensured, and the prefabricated template is convenient to manufacture and construct.
Further, the grouting openings and the air exhaust holes are arranged in different surfaces and distributed in high and low mode, so that cast-in-place concrete is more compact during grouting construction, and whether the consistency flowing out of the air exhaust holes reaches a specified consistency is conveniently checked.
Further, the outer contour of the lower part of the upper section of the prefabricated pier is smaller than the inner contour of the upper part of the lower section of the prefabricated pier, a gap is formed between the upper section of the prefabricated pier and the lower section of the prefabricated pier, concrete can be injected into the gap, and meanwhile, shear nails are arranged on the lower part of the upper section of the prefabricated pier, so that the upper section of the prefabricated pier is firmly and reliably connected with the lower section of the prefabricated pier in a wet connection mode.
Furthermore, the existing method mostly adopts a construction method of prefabricating the capping beam and the pier respectively, so that the on-site construction process and the operation difficulty are increased. Compared with the prior fabricated precast pier structure and construction method, the capping beam and the upper section precast pier are integrally precast, so that the structural integrity is improved, and the assembly construction process is reduced.
Furthermore, the inside of the upper and lower precast bridge pier adopts a hollow structural form, so that the dead weight of the bridge pier is greatly reduced on the premise of meeting the structural rigidity requirement, the precast bridge pier is convenient to transport and hoist, the concrete consumption is saved, and the construction cost is reduced.
The construction method of the invention has the advantages that the upper and lower precast piers are built by adopting the factory-like precast assembly technology, the standardization, industrialization and assembly of the construction process are realized, the rapid construction requirement of the high pier bridge can be met, the construction period is greatly shortened, the engineering quality is improved, and the adverse effects on urban traffic and environment in the construction process are reduced.
Drawings
Fig. 1 is a structural isometric view (a) of a prefabricated assembled segment pier structure and a lower segment pier steel plate hoop structure view (b) according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a lower segment of a prefabricated pier at a seventh point of a prefabricated assembled segment pier construction according to an embodiment of the present invention;
fig. 3 is a front view of a prefabricated assembled segment pier construction according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a prefabricated assembled segment pier construction along the longitudinal plane of the grouting opening and the vent hole according to an embodiment of the present invention;
In the figure: 1-upper segment prefabricating bridge piers; 2-prefabricating bridge piers at the lower section; 3-a cast-in-situ bearing platform; 4, embedding steel plates for bridge piers; 5-embedding a steel plate on the bearing platform; 6-high-strength bolts; 7-bolt holes; 8-upper section bulge; 9-a lower section convex groove; 10-a bearing platform funnel-shaped reserved groove; 11-grouting port; 12-an exhaust hole; 13-upper bridge pier steel plate hoops; 14—a first shear pin; 15-lower bridge pier steel plate hoops; 16-bearing platform cast-in-place concrete; 17-a capping beam; 18-a support; 19-a second shear pin.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The key technology of the invention is as follows: accurate butt joint of the lower-section prefabricated bridge pier and a bearing platform reserved groove of a cast-in-situ bearing platform, accurate butt joint of the upper-section prefabricated bridge pier and the lower-section prefabricated bridge pier, tying joint of a pier embedded steel plate and a bearing platform embedded steel plate, and wet joint of a joint part after hoisting of the upper-section prefabricated bridge pier and the lower-section prefabricated bridge pier.
As shown in fig. 1, the prefabricated assembly segment pier structure mainly comprises an upper segment of prefabricated pier 1, a lower segment of prefabricated pier 2 and a cast-in-situ bearing platform 3.
The upper surface of the cast-in-situ bearing platform 3 is provided with a bearing platform reserved groove 10 with an upward opening, a lower-section pier steel plate hoop 15 is pre-buried at the lower part of the lower-section precast pier 2, a first shear pin 14 is arranged on the outer surface of the lower part of the lower-section pier steel plate hoop 15, and the lower-section pier steel plate hoop has a certain thickness of a concrete protection layer and is used for increasing the binding force between the lower-section precast pier 2 and cast-in-situ concrete. During assembly, the lower part of the lower joint precast pier 2 is arranged in the bearing platform reservation groove 10. In this embodiment, the cross section of the reserved groove 10 of the bearing platform gradually increases from bottom to top, the bottom surface of the reserved groove 10 of the bearing platform is matched with the bottom surface of the prefabricated pier 2 of the lower section, and when the prefabricated pier 2 of the lower section is assembled, after the lower part of the prefabricated pier 2 of the lower section is placed in the reserved groove 10 of the bearing platform, the gap between the cast-in-situ bearing platform 3 and the prefabricated pier 2 of the lower section is filled with quick-hardening high-strength concrete to form cast-in-situ bearing platform concrete 16.
As shown in fig. 1 and 2, a bearing platform embedded steel plate 5 is arranged at the top of the cast-in-situ bearing platform 3, a lower-section pier embedded steel plate 4 is arranged on the outer surface of the upper part of a lower-section pier steel plate hoop 15, the bearing platform embedded steel plate 5 and the lower-section pier embedded steel plate 4 are arranged in a one-to-one correspondence manner and are respectively provided with a bolt hole 7, when the cast-in-situ bearing platform is assembled, the lower-section pier embedded steel plate 4 is positioned above the cast-in-situ bearing platform 3 after the lower-section precast pier 2 is arranged in a bearing platform reserved groove 10, and the bearing platform embedded steel plate 5 and the lower-section pier embedded steel plate 4 are fastened through bolts 6, so that the integrity of the cast-in-situ bearing platform is improved. In this embodiment, the lower bridge pier embedded steel plate 4 is a rectangular triangular steel plate and rectangular steel plate combined steel plate, two rectangular triangular steel plates are vertically connected to one rectangular steel plate, the two rectangular triangular steel plates are connected with one rectangular steel plate in a double-sided welding mode, bolt holes 7 are formed in the rectangular steel plates on two sides of the rectangular triangular steel plate, and the bearing platform embedded steel plate 5 is a rectangular steel plate with the same size as the rectangular steel plate in the lower bridge pier embedded steel plate 4. In this embodiment, two lower bridge pier embedded steel plates 4 are welded to each side of the lower bridge pier steel plate hoop 15 in the transverse bridge direction, and one lower bridge pier embedded steel plate 4 is welded to each side of the longitudinal bridge direction. The lower-section pier embedded steel plate 4 and the lower-section pier steel plate hoop 15 are welded in a double-sided welding mode; the lower-section pier embedded steel plate 4 and the bearing platform embedded steel plate 5 are bolted in a single-side friction mode.
As shown in fig. 4, a variable cross section is arranged at the pier top six-division point of the lower-section prefabricated pier 2, and the upper part and the lower part of the pier top six-division point are realized by a special template, namely, a step is formed on the inner side of the lower-section prefabricated pier 2. The lower section precast pier 2 is provided with a lower section pier bulge towards the middle position of the side surface, the lower section pier bulge is longitudinally arranged and extends to the position of the upper surface parallel and level of the lower section precast pier 2 and the cast-in-situ bearing platform 3 from the top of the lower section precast pier 2, and the upper part of the lower section pier bulge is arranged in a convex groove structure to form a lower section pier groove 9 similar to a mortise. The upper end face of the lower section pier groove 9 is flush with the upper end face of the lower section precast pier 2, the lower end face of the lower section pier groove 9 is flush with the step face of the step on the inner side of the lower section precast pier 2, and the lower section pier groove 9 is communicated with the hollow structure on the upper part of the lower section precast pier 2. As shown in fig. 3, grouting openings 11 are formed on two sides of the lower-section bridge pier groove 9 on the large pile number side of the lower-section prefabricated bridge pier 2, exhaust holes 12 are formed on two sides of the lower-section bridge pier groove 9 on the small pile number side, and the positions of the exhaust holes 12 are higher than the grouting openings 11, so that grouting construction is performed after the upper-section prefabricated bridge pier and the lower-section prefabricated bridge pier are assembled.
As shown in fig. 4, the variable cross section is set at the six points of the pier bottom of the upper-section precast pier 1, and the steps are formed on the periphery of the upper-section precast pier 1 by a special template, wherein the upper part is the upper part and the lower part is the lower part of the six points of the pier bottom. The transverse bridge of the upper-section prefabricated bridge pier 1 is provided with an upper-section bridge pier bulge towards the side central axis, the upper-section bridge pier bulge is longitudinally arranged and extends from the top of the upper-section prefabricated bridge pier 1 to the bottom of the upper-section prefabricated bridge pier 1, an upper-section bridge pier convex strip 8 is formed after the variable cross section of the lower part of the upper-section bridge pier bulge is similar to a tenon, the size of the upper-section bridge pier convex strip 8 is consistent with the size of the lower-section bridge pier groove 9, and the outer contour of the lower part of the upper-section prefabricated bridge pier 1 is smaller than the inner contour of the upper part of the lower-section prefabricated bridge pier 2.
The lower part of the upper section precast pier 1 is pre-buried and provided with an upper section pier steel plate hoop 13, the outer surface of the upper section pier steel plate hoop 13 is provided with a second shear pin 19, and the upper section precast pier 1 has a certain thickness of a concrete protection layer and is used for increasing the binding force between the upper section precast pier 1 and cast-in-place concrete.
In this embodiment, the upper-section prefabricated bridge pier 1 and the lower-section prefabricated bridge pier 2 are both thin-wall hollow structures.
During assembly, the lower part of the upper section precast pier 1 is inserted into the upper cavity of the lower section precast pier 2, the upper section pier convex strip 8 is inserted into the lower section pier groove 9, the bottom of the upper section precast pier 1 is arranged on the step inside the lower section precast pier 2, and then grouting is carried out from a grouting opening, namely concrete is injected, and the structural integrity is improved through grouting.
The top of the upper section precast pier 1 is provided with a capping beam 17, the upper section precast pier 1 and the capping beam 17 are prefabricated integrally, and the top of the capping beam is provided with a support 18.
The construction method of the invention comprises the following steps: casting a cast-in-place bearing platform 3 on a construction site, prefabricating an upper section of prefabricated pier 1 and a lower section of prefabricated pier 2 in a prefabricating factory, and assembling the piers after maintenance is finished. During hoisting, the lower-section prefabricated thin-wall hollow pier 2 is firstly installed, after the lower-section prefabricated thin-wall hollow pier 2 is hoisted into the bearing platform reserved groove 10, the lower-section pier embedded steel plate 4 and the bearing platform embedded steel plate 5 are fastened by bolts 6, then quick and hard high-strength concrete is poured into a gap between the bearing platform reserved groove 10 and the lower-section prefabricated pier 2, and finally the upper-section prefabricated pier 1 is hoisted and is pressed into slurry from the lowest grouting hole 11.
The specific construction method comprises the following steps:
The method comprises the steps of firstly, realizing section change of a lower-section precast pier 2 and downward-section pier bulge and convex groove of a transverse bridge through a special template, arranging a lower-section pier steel plate hoop 15 with shear nails at the lower part of the lower-section precast pier 2, welding the lower-section pier steel plate hoop with main ribs in the lower-section precast pier 2, having a certain thickness of a concrete protection layer, welding a lower-section pier embedded steel plate 4 with the lower-section pier steel plate hoop 15 at the position of an embedded lower-section pier embedded steel plate 4, pouring concrete, and prefabricating an upper-section precast pier 1 and a lower-section precast pier 2 in a factory;
secondly, pouring a cast-in-place bearing platform 3 on site, arranging a bearing platform reserved groove 10 at the top of the cast-in-place bearing platform 3, wherein the bottom surface of the bearing platform reserved groove 10 is the same as the bottom surface of the lower-section precast pier 2 in size, and embedding a rectangular steel plate with a bolt hole 7 at the position corresponding to the embedded steel plate 4 of the lower-section pier on the top surface of the cast-in-place bearing platform 3.
And thirdly, accurately hoisting the prefabricated lower-section prefabricated bridge pier 2 to the position above the cast-in-situ bearing platform 3 by using a crane, and slowly falling after positioning is finished until the lower-section prefabricated bridge pier 2 enters the appointed depth of the cast-in-situ bearing platform 3.
And fourthly, connecting the bearing platform embedded steel plate 5 with the lower-section pier embedded steel plate 4 through bolts 6.
And fifthly, filling quick-hardening high-strength concrete in the gap between the reserved groove 10 of the funnel-shaped bearing platform and the lower-section prefabricated pier 2.
And step six, after the cast-in-place concrete of the cast-in-place bearing platform 3 reaches 80% of the design strength, accurately hoisting the upper-section prefabricated bridge pier 1 above the lower-section prefabricated bridge pier 2 by using a crane, and after the upper-section bridge pier bulge and the lower-section bridge pier convex groove are accurately butted, slowly lowering the upper-section prefabricated bridge pier 1 until the lower part of the variable cross section of the upper-section prefabricated bridge pier 1 completely enters the upper cavity of the lower-section prefabricated bridge pier 2.
And seventh, hanging the upper section precast pier 1 into the cavity at the upper part of the lower section precast pier 2, accurately butting the upper section pier convex strips 8 with the lower section pier grooves 9, and pouring high-strength concrete from the transverse bridge of the lower section precast pier 2 to the large pile side grouting port 11 until the cement slurry flows out from the highest vent hole 12 at the other side and the consistency of the cement slurry reaches the consistency of injection.
And step eight, checking whether the connection between the cast-in-situ bearing platform 3 and the lower-section prefabricated pier 2 and the connection between the lower-section prefabricated pier 2 and the upper-section prefabricated pier 1 meet the design requirement.
The invention has the main advantages that: the standardization, industrialization and assembly of the construction process are realized by prefabricating the upper and lower bridge piers and other accessory components in a factory. By carrying out sectional prefabrication on the large pier, the large-scale prefabrication construction is realized, the rapid construction requirement of the high pier bridge can be met, the construction period is greatly shortened, the engineering quality is improved, and the adverse effects on urban traffic and environment in the construction process are reduced. Compared with the prior fabricated precast pier structure and construction method, the capping beam and the pier are integrally precast, so that the structural integrity is improved, and the spliced construction procedures are reduced; and the similar mortise and tenon structures are arranged on the lateral sides of the bridge pier transverse bridge, so that accurate positioning is convenient during hoisting, and the construction efficiency is greatly improved. The system has simple structure, does not need complex construction machinery, is easy to install, reduces the assembly construction difficulty, reduces the construction cost and is convenient to popularize. The pier embedded steel plate and the bearing platform embedded steel plate are bolted in a single-sided friction mode, and a wet-connection mode is adopted between the upper and lower section piers and between the funnel-shaped reserved groove and the pier column, so that the connection is firmer and more reliable. The requirements of safety, high efficiency, environmental protection, durability, economy and sustainable development are realized.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant technical field, are included in the scope of the present invention.
Claims (8)
1. The prefabricated assembled segmental pier structure is characterized by comprising an upper segmental prefabricated pier (1), a lower segmental prefabricated pier (2) and a cast-in-situ bearing platform (3);
the upper surface of the cast-in-situ bearing platform (3) is provided with a bearing platform reserved groove (10), and when the cast-in-situ bearing platform is assembled, the lower part of the lower section prefabricated pier (2) is arranged in the bearing platform reserved groove (10) for fixation;
The upper part of the lower-section prefabricated pier (2) is of a hollow structure, and a step is formed at the inner side of the lower-section prefabricated pier (2); the upper part of the lateral surface of the lower-section precast bridge pier (2) is longitudinally provided with a lower-section bridge pier groove (9), the upper end surface of the lower-section bridge pier groove (9) is flush with the upper end surface of the lower-section precast bridge pier (2), the lower end surface of the lower-section bridge pier groove (9) is flush with the step surface of the step at the inner side of the lower-section precast bridge pier (2), and the lower-section bridge pier groove (9) is communicated with the hollow structure at the upper part of the lower-section precast bridge pier (2); the upper section prefabricated bridge pier (1) is arranged in a variable cross section from top to bottom, the cross section area of the upper part of the upper section prefabricated bridge pier (1) is larger than that of the lower part, and a step is formed at the periphery of the upper section prefabricated bridge pier (1); an upper section bridge pier convex strip (8) is longitudinally arranged at the lower part of the lateral surface of the transverse bridge of the upper section bridge pier (1), the upper end surface of the upper section bridge pier convex strip (8) coincides with the step surface of the peripheral step of the upper section bridge pier (1), the lower end surface of the upper section bridge pier convex strip (8) is flush with the lower end surface of the upper section bridge pier (1), and the upper section bridge pier convex strip (8) is matched with the lower section bridge pier groove (9); when the prefabricated bridge is assembled, the lower part of the upper-section prefabricated bridge pier (1) is inserted into the upper hollow structure of the lower-section prefabricated bridge pier (2), the upper-section bridge pier convex strip (8) is inserted into the lower-section bridge pier groove (9), the bottom of the upper-section prefabricated bridge pier (1) is arranged on a step on the inner side of the lower-section prefabricated bridge pier (2) for fixing, and the step surface of the upper step of the upper-section prefabricated bridge pier (1) is arranged on the top end surface of the lower-section prefabricated bridge pier (2);
The outer contour of the lower part of the upper section prefabricated pier (1) is smaller than the inner contour of the upper part of the lower section prefabricated pier (2); an upper-section pier steel plate hoop (13) is pre-buried at the lower part of the upper-section precast pier (1), and a second shear pin (19) is arranged on the outer surface of the upper-section pier steel plate hoop (13); the upper part of the lower joint prefabrication bridge pier (2) is provided with a grouting opening (11) and an exhaust hole (12), and the position of the exhaust hole (12) is higher than that of the grouting opening (11); when in assembly, the lower part of the upper joint precast pier (1) is inserted into the upper hollow structure of the lower joint precast pier (2), and then concrete is injected from the grouting opening (11);
the upper section prefabricated bridge pier (1) is of a hollow structure; the lower part of the lower-section prefabricated pier (2) is of a hollow structure, the lower-section prefabricated pier (2) is of a variable cross-section structure from top to bottom, and a step is formed between the upper part and the lower part of the lower-section prefabricated pier (2).
2. The prefabricated assembled segmental pier structure according to claim 1, wherein a lower segmental pier steel plate hoop (15) is pre-buried at the lower part of the lower segmental pier (2), and a first shear pin (14) is arranged at the outer surface of the lower part of the lower segmental pier steel plate hoop (15); the cross section of the bearing platform reservation groove (10) is gradually increased from bottom to top, the bottom surface of the bearing platform reservation groove (10) is the same as the bottom surface of the lower-section precast pier (2), and when the bearing platform reservation groove is assembled, concrete is poured into a gap between the cast-in-situ bearing platform (3) and the lower-section precast pier (2) after the lower part of the lower-section precast pier (2) is arranged in the bearing platform reservation groove (10).
3. The prefabricated assembled segmental pier structure according to claim 1, wherein a lower segmental pier steel plate hoop (15) is pre-buried at the lower part of the lower segmental prefabricated pier (2), and a lower segmental pier pre-buried steel plate (4) is arranged on the upper outer surface of the lower segmental pier steel plate hoop (15); a bearing platform embedded steel plate (5) is arranged at the top of the cast-in-situ bearing platform (3), and the bearing platform embedded steel plate (5) and the lower bridge pier embedded steel plate (4) are arranged in one-to-one correspondence; when the prefabricated pier is assembled, the lower part of the lower-section prefabricated pier (2) is placed in the bearing platform reserved groove (10), the lower-section pier embedded steel plate (4) is positioned above the cast-in-situ bearing platform (3), and the bearing platform embedded steel plate (5) and the lower-section pier embedded steel plate (4) are connected through bolts (6).
4. The prefabricated assembled segmental pier structure according to claim 1, wherein the lower segmental pier (2) is provided with a lower segmental pier bulge along the longitudinal direction along the lateral direction, the lower segmental pier bulge extends to the position of the lower segmental pier (2) flush with the upper surface of the cast-in-situ bearing platform (3) from the top of the lower segmental pier (2), and the upper part of the lower segmental pier bulge is arranged in a convex groove structure to form a lower segmental pier groove (9); the transverse bridge of the upper section prefabricated bridge pier (1) is provided with an upper section bridge pier bulge to the side surface, the upper section bridge pier bulge is longitudinally arranged and extends from the top of the upper section prefabricated bridge pier (1) to the bottom of the upper section prefabricated bridge pier (1), and the variable cross section of the lower part of the upper section bridge pier bulge forms an upper section bridge pier convex strip (8).
5. The prefabricated assembled segmental pier structure according to claim 1, wherein the grouting opening (11) is provided on a large pile number side of the lower segmental pier (2), and the exhaust hole (12) is provided on a small pile number side of the lower segmental pier (2).
6. The prefabricated assembled segmental pier structure according to claim 1, wherein a capping beam (17) is arranged at the top of the upper segmental prefabricated pier (1), and the upper segmental prefabricated pier (1) and the capping beam (17) are integrally arranged.
7. The construction method of the prefabricated assembled segmental pier structure according to any one of claims 1 to 6, characterized in that an upper segmental prefabricated pier (1) and a lower segmental prefabricated pier (2) are prefabricated in a prefabricated factory, a cast-in-place bearing platform (3) is poured in a construction site, the upper segmental prefabricated pier (1) and the lower segmental prefabricated pier (2) are transported to the construction site, positioning is carried out through a bearing platform reserved groove (10) of the cast-in-place bearing platform (3), the lower segmental prefabricated pier (2) is hoisted into the bearing platform reserved groove (10) of the cast-in-place bearing platform (3) and connected and fixed, positioning is carried out through an upper segmental convex strip (8) and a lower segmental pier groove (9), the upper segmental prefabricated pier (1) is hoisted, the lower part of the upper segmental prefabricated pier (1) is inserted into an upper hollow structure of the lower segmental pier (2), and the upper segmental convex strip (8) is inserted into the lower segmental pier groove (9).
8. The construction method of the prefabricated assembled segment pier structure according to claim 7, wherein in the prefabricated assembled segment pier structure, a lower segment pier steel plate hoop (15) is pre-buried at the lower part of the lower segment prefabricated pier (2), and a first shear pin (14) is arranged at the outer surface of the lower part of the lower segment pier steel plate hoop (15); the cross section of the bearing platform reserved groove (10) is gradually increased from bottom to top, and the bottom surface of the bearing platform reserved groove (10) is the same as the bottom surface of the lower-section precast pier (2) in size;
the specific construction method comprises the following steps:
Step one, prefabricating an upper section prefabricating pier (1) and a lower section prefabricating pier (2) in a factory through a special template;
secondly, casting a cast-in-situ bearing platform (3) by adopting cast-in-situ concrete on a construction site;
hoisting the prefabricated lower-section prefabricated bridge pier (2) to the upper part of the cast-in-situ bearing platform (3), and falling after positioning is finished until the bottom of the lower-section prefabricated bridge pier (2) contacts the bottom surface of the bearing platform reservation groove (10);
step four, filling concrete in a gap between the cast-in-situ bearing platform (3) and the lower-section prefabricated bridge pier (2);
Step five, after the cast-in-place concrete of the cast-in-place bearing platform (3) reaches 80% of the design strength, hoisting the upper-section prefabricated bridge pier (1) above the lower-section prefabricated bridge pier (2), and after the upper-section bridge pier convex strip (8) and the lower-section bridge pier groove (9) are accurately butted, descending the upper-section prefabricated bridge pier (1) until the part below the step of the upper-section prefabricated bridge pier (1) completely enters the upper hollow structure of the lower-section prefabricated bridge pier (2);
And step six, pouring concrete from the grouting opening (11) of the lower prefabricated pier (2) until the concrete flows out from the vent hole (12) and the consistency of the concrete flows out reaches the consistency of pouring.
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| CN113123214A (en) * | 2020-01-10 | 2021-07-16 | 中国国家铁路集团有限公司 | Large-beam and high-upright-column prefabricated assembled frame pier and construction method |
| CN111236050A (en) * | 2020-01-16 | 2020-06-05 | 长安大学 | Steel pipe concrete wall pier and construction method thereof |
| CN113737636B (en) * | 2021-09-18 | 2023-07-21 | 西安市政设计研究院有限公司 | Steel-concrete combined connection structure suitable for assembled pier stud and construction method thereof |
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| CN108396640A (en) * | 2018-04-23 | 2018-08-14 | 南昌大学 | A kind of assembly concrete pier column structure |
| CN208136710U (en) * | 2018-05-07 | 2018-11-23 | 王建龙 | A kind of prefabricated bridge substructure |
| CN109555011A (en) * | 2019-01-17 | 2019-04-02 | 长安大学 | The composite construction and manufacture and assembly method of a kind of full precast pier and cushion cap |
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| KR101269144B1 (en) * | 2006-12-20 | 2013-05-29 | 재단법인 포항산업과학연구원 | Pier structure having precast segment |
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| CN104895249B (en) * | 2015-06-09 | 2017-09-29 | 华侨大学 | It is a kind of can in-situ immobilization combination suspension column |
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| CN108396640A (en) * | 2018-04-23 | 2018-08-14 | 南昌大学 | A kind of assembly concrete pier column structure |
| CN208136710U (en) * | 2018-05-07 | 2018-11-23 | 王建龙 | A kind of prefabricated bridge substructure |
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