CN110565510A - 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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- CN110565510A CN110565510A CN201910872310.5A CN201910872310A CN110565510A CN 110565510 A CN110565510 A CN 110565510A CN 201910872310 A CN201910872310 A CN 201910872310A CN 110565510 A CN110565510 A CN 110565510A
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- 238000010276 construction Methods 0.000 title claims abstract description 75
- 238000009417 prefabrication Methods 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 89
- 239000010959 steel Substances 0.000 claims description 89
- 239000004567 concrete Substances 0.000 claims description 28
- 239000011440 grout Substances 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract description 4
- 238000011065 in-situ storage Methods 0.000 description 7
- 210000001503 joint Anatomy 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000011372 high-strength concrete Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 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
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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 sectional type pier structure and a construction method, wherein the upper section and the lower section of the prefabricated pier and other accessory components are prefabricated in a factory, so that the standardization, the industrialization and the assembly of the construction process are realized; the large bridge pier is prefabricated in sections, so that the large-scale prefabrication construction is realized, the rapid construction requirement of a 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 the environment in the construction process are reduced; a cushion cap preformed groove is arranged on the cast-in-place cushion cap, and positioning during hoisting of the lower prefabricated pier is facilitated during assembly; the lower section of the bridge pier groove is formed in the lower section of the prefabricated bridge pier, the upper section of the bridge pier protruding strip is arranged on the upper section of the prefabricated bridge pier, the upper section of the bridge pier groove and the lower section of the prefabricated bridge pier form a tenon-and-mortise-like structure, accurate positioning is achieved when hoisting is facilitated, the construction difficulty is greatly reduced, the construction efficiency is greatly improved, and the construction period is shortened.
Description
Technical Field
The invention belongs to the field of bridge engineering, and particularly relates to a prefabricated assembled segmental pier structure and a construction method.
Background
Along with the rapid development of the Chinese economic society, the urban traffic is increasingly heavy, and the construction period is longer due to the reason that the concrete age is longer and the like in the traditional bridge construction method by adopting construction modes such as bracket cast-in-place and the like, so that the urban traffic is seriously influenced. The prefabricated bridge can furthest reduce the interference to the existing traffic, greatly increase the construction safety, reduce the pollution to the construction site environment, obviously accelerate the construction progress and provide great convenience for the maintenance and the replacement of later-stage bridge members. The prefabrication and assembly technology of domestic bridge superstructure and bridge deck system structure has tended to mature, and the prefabrication and assembly technology of bridge substructure, especially higher pier, is less, and is only applied to some gravity type piers of sea-crossing bridges.
at present, some urban bridges are constructed in a mode of factory prefabrication and field hoisting. However, most of the construction methods are only for the integral bridge piers, and the size of the bridge piers is limited by transportation tools and hoisting machinery, so that some high and large bridge piers cannot adopt a factory-prefabricated construction mode, the construction period of the bridges is too long, and the urban traffic and the environment are greatly influenced. A small number of segment pier prefabricating methods exist at present, but the methods are difficult to realize accurate butt joint when the 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 a prefabricated assembled segmental pier structure and a construction method, which can realize accurate butt joint during pier assembly, reduce the construction difficulty, improve the construction efficiency and shorten the construction period of a bridge.
The invention is realized by the following technical scheme:
The prefabricated assembled segmental pier structure comprises an upper segment prefabricated pier, a lower segment prefabricated pier and a cast-in-place bearing platform;
the upper surface of the cast-in-place bearing platform is provided with a bearing platform reserved groove, and the lower part of the lower prefabricated pier is arranged in the bearing platform reserved groove and fixed during assembly;
The upper part of the lower prefabricated pier is of a hollow structure, and a step is formed on the inner side of the lower prefabricated pier; a lower section of bridge pier groove is longitudinally arranged at the upper part of the lateral surface of the lower section of prefabricated bridge pier, the upper end surface of the lower section of bridge pier groove is flush with the upper end surface of the lower section of prefabricated bridge pier, the lower end surface of the lower section of bridge pier groove is flush with the step surface of the step at the inner side of the lower section of prefabricated bridge pier, and the lower section of bridge pier groove is communicated with the hollow structure at the upper part of the lower section of prefabricated bridge pier; the upper prefabricated pier is arranged in a variable cross section from top to bottom, the upper section area of the upper prefabricated pier is larger than the lower section area, and a step is formed on the periphery of the upper prefabricated pier; the upper section of prefabricated pier is provided with a transverse bridge lateral surface and a transverse bridge lateral surface, wherein the transverse bridge lateral surface is provided with an upper section of pier protruding strip along the longitudinal direction; during assembly, the lower part of the upper prefabricated pier is inserted into the upper hollow structure of the lower prefabricated pier, the convex strip of the upper prefabricated pier is inserted into the groove of the lower prefabricated pier, the bottom of the upper prefabricated pier is fixed on the step on the inner side of the lower prefabricated pier, and the step surface of the upper step of the upper prefabricated pier is arranged on the top end surface of the lower prefabricated pier.
Preferably, a lower pier steel plate hoop is pre-embedded at the lower part of the lower prefabricated pier, and a first shear nail is arranged on the outer surface of the lower part of the lower pier steel plate hoop; the cross section of the bearing platform preformed groove is gradually increased from bottom to top, the bottom surface of the bearing platform preformed groove is the same as the bottom surface of the lower prefabricated pier, and during assembly, after the lower part of the lower prefabricated pier is placed in the bearing platform preformed groove, concrete is poured into a gap between the cast-in-place bearing platform and the lower prefabricated pier.
Preferably, a lower pier steel plate hoop is embedded at the lower part of the lower prefabricated pier, and a lower pier embedded steel plate is arranged on the upper outer surface of the lower pier steel plate hoop; the top of the cast-in-place bearing platform is provided with a bearing platform embedded steel plate, and the bearing platform embedded steel plate and the lower pier embedded steel plate are arranged in a one-to-one correspondence manner; during assembly, after the lower part of the lower section of prefabricated pier is arranged in the reserved groove of the bearing platform, the embedded steel plate of the lower section of pier is positioned above the cast-in-place bearing platform, and the embedded steel plate of the bearing platform and the embedded steel plate of the lower section of pier are connected through bolts.
Preferably, lower pier bulges are arranged on the lateral sides of the lower prefabricated pier cross bridge and extend from the top of the lower prefabricated pier to the position where the lower prefabricated pier is flush with the upper surface of the cast-in-place bearing platform, and the upper parts of the lower pier bulges are arranged in a convex groove structure to form lower pier grooves; the lateral side of the transverse bridge of the upper-section prefabricated bridge pier is provided with an upper-section bridge pier protrusion, the upper-section bridge pier protrusion is longitudinally arranged and extends to the bottom of the upper-section prefabricated bridge pier from the top of the upper-section prefabricated bridge pier, and an upper-section bridge pier protruding strip is formed on the lower variable cross section of the upper-section bridge pier protrusion.
Preferably, the outer contour of the lower part of the upper prefabricated pier is smaller than the inner contour of the upper part of the lower prefabricated pier; an upper pier steel plate hoop is pre-embedded at the lower part of the upper prefabricated pier, and a second shear nail is arranged on the outer surface of the upper pier steel plate hoop; the upper part of the lower prefabricated pier is provided with a grout pressing port and an exhaust hole, and the exhaust hole is higher than the grout pressing port; during assembly, after the lower part of the upper prefabricated pier is inserted into the upper hollow structure of the lower prefabricated pier, concrete is injected from the grouting opening.
Preferably, the grouting opening is arranged on the large pile number side of the lower prefabricated pier, and the exhaust hole is arranged on the small pile number side of the lower prefabricated pier.
Preferably, the top of the upper prefabricated pier is provided with a capping beam, and the upper prefabricated pier and the capping beam are arranged in an integrated structure.
Preferably, the upper prefabricated pier is of a hollow structure; the lower part of the lower prefabricated pier is of a hollow structure, the lower prefabricated pier is arranged in 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 prefabricated pier.
The construction method of the prefabricated sectional pier structure comprises the steps of prefabricating an upper prefabricated pier and a lower prefabricated pier in a prefabricated factory, pouring a cast-in-place cushion cap in a construction site, transporting the upper prefabricated pier and the lower prefabricated pier to the construction site, positioning through a cushion cap preformed groove of the cast-in-place cushion cap, hanging the lower prefabricated pier into the cushion cap preformed groove of the cast-in-place cushion cap, fixing through an upper pier convex strip and a lower pier groove, hanging the upper prefabricated pier, enabling the lower part of the upper prefabricated pier to be inserted into an upper hollow structure of the lower prefabricated pier, and enabling the upper pier convex strip to be inserted into the lower pier groove.
preferably, in the prefabricated assembled segmental pier structure, a lower pier steel plate hoop is pre-embedded at the lower part of a lower prefabricated pier, and a first shear nail is arranged on the outer surface of the lower part of the lower pier steel plate hoop; the cross section of the bearing platform preformed groove is gradually increased from bottom to top, and the size of the bottom surface of the bearing platform preformed groove is the same as that of the bottom surface of the lower prefabricated pier; the outer contour of the lower part of the upper prefabricated pier is smaller than the inner contour of the upper part of the lower prefabricated pier; an upper pier steel plate hoop is pre-embedded at the lower part of the upper prefabricated pier, and a second shear nail is arranged on the outer surface of the upper pier steel plate hoop; the upper part of the lower prefabricated pier is provided with a grout pressing port and an exhaust hole, and the exhaust hole is higher than the grout pressing port;
the specific construction method comprises the following steps:
Firstly, prefabricating an upper prefabricated bridge pier and a lower prefabricated bridge pier in a factory through a special template;
Step two, adopting cast-in-place concrete to cast a cast-in-place bearing platform on the construction site;
Hoisting the prefabricated lower prefabricated pier section above a cast-in-place bearing platform, and falling down after the prefabricated lower prefabricated pier section is positioned until the bottom of the prefabricated lower pier section contacts the bottom surface of a reserved groove of the bearing platform;
Filling concrete into a gap between the cast-in-place bearing platform and the lower prefabricated pier;
and step five, after the cast-in-place concrete of the cast-in-place cushion cap reaches 80% of the design strength, hoisting the upper prefabricated pier to the position above the lower prefabricated pier, and after the convex strips of the upper prefabricated pier and the grooves of the lower prefabricated pier are accurately butted, descending the upper prefabricated pier until the part below the steps of the upper prefabricated pier completely enters the hollow structure at the upper part of the lower prefabricated pier.
And step six, pouring concrete from a grouting opening of the lower prefabricated pier until the concrete flows out from the exhaust hole and the flowing consistency reaches the injected consistency.
Compared with the prior art, the invention has the following beneficial technical effects:
The invention realizes the standardization, industrialization and assembly of the construction process by prefabricating the upper and lower prefabricated piers and other accessory components in a factory. Through carrying out the segmentation prefabrication with large-scale pier, realized the maximization of prefabrication construction, can satisfy the quick construction requirement of high mound bridge, reduced construction's cycle greatly, promoted engineering quality, reduced the adverse effect to urban traffic, environment in the work progress. A cushion cap preformed groove is arranged on the cast-in-place cushion cap, and positioning during hoisting of the lower prefabricated pier is facilitated during assembly; the lower section of the bridge pier groove is formed in the lower section of the prefabricated bridge pier, the upper section of the bridge pier protruding strip is arranged on the upper section of the prefabricated bridge pier, the upper section of the bridge pier groove and the lower section of the prefabricated bridge pier form a tenon-and-mortise-like structure, accurate positioning is achieved when hoisting is facilitated, the construction difficulty is greatly reduced, the construction efficiency is greatly improved, and the construction period is shortened.
Furthermore, the reserved groove of the bearing platform is arranged in a mode that the cross section is gradually increased from bottom to top, so that a gap is formed between the cast-in-place bearing platform and the lower prefabricated pier, concrete can be injected into the gap, and meanwhile, the lower part of the lower prefabricated pier is provided with the shear nails, so that the connection mode of wet connection is adopted, and the cast-in-place bearing platform and the lower prefabricated pier are connected more firmly and reliably.
Furthermore, the cast-in-place cushion cap is connected with the lower prefabricated pier through a steel plate, so that the connection reliability of the lower prefabricated pier and the cast-in-place cushion cap is ensured, and the enough compression resistance, bending resistance, shearing resistance and ductility shock resistance of the pier bottom are ensured.
Furthermore, the transverse bridge of the upper prefabricated pier is arranged from the top bent cap to the bottom of the pier in a protruding manner and corresponds to the convex groove of the lower prefabricated pier, so that the integrity and the attractiveness of the pier are guaranteed, and the prefabricated template can be conveniently manufactured and constructed.
Furthermore, grout pressing port and exhaust hole adopt the mode that the antarafacial set up, height distribute to cast in situ concrete is compacter when making the mud jacking construction, and is convenient for inspect whether the consistency that the exhaust hole flows reaches the regulation consistency.
Furthermore, the outer contour of the lower part of the upper prefabricated pier is smaller than the inner contour of the upper part of the lower prefabricated pier, a gap is formed between the upper prefabricated pier and the lower prefabricated pier, concrete can be injected into the gap, and meanwhile, the shear nails are arranged on the lower part of the upper prefabricated pier, so that the wet connection mode is adopted, and the existing upper prefabricated pier and the lower prefabricated pier are connected more firmly and reliably.
furthermore, most of the existing methods adopt a construction method that a capping beam and a pier are respectively prefabricated, so that the field construction process and operation difficulty are increased. Compared with the existing fabricated prefabricated pier structure and construction method, the fabricated prefabricated pier structure and construction method have the advantages that the cover beam and the upper prefabricated pier are integrally prefabricated, the structural integrity is improved, and the construction process of assembling is reduced.
furthermore, the hollow structural form is adopted inside the upper and lower prefabricated bridge piers, the dead weight of the bridge piers is greatly reduced on the premise of meeting the structural rigidity requirement, the prefabricated bridge piers are convenient to transport and hoist, the consumption of concrete is saved, and the construction cost is reduced.
According to the construction method, the upper and lower prefabricated piers are built by adopting the factory-like prefabricated assembly technology, so that the standardization, factory-like 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 axonometric view (a) and a lower bridge pier steel plate hoop structural view (b) of a prefabricated assembled segmental bridge pier structure according to a specific embodiment of the invention;
Fig. 2 is a transverse cross-sectional view at a seven-point height of a lower prefabricated pier of the prefabricated assembled segmented pier structure according to the embodiment of the invention;
Fig. 3 is a front view of a prefabricated sectional pier construction according to an embodiment of the present invention;
Fig. 4 is a sectional view of a prefabricated sectional pier structure along a longitudinal plane where a grout pressing port and an exhaust hole are located according to an embodiment of the invention;
In the figure: 1-prefabricating an upper section of a bridge pier; 2-prefabricating a pier at a lower section; 3, casting a bearing platform in situ; 4, embedding a steel plate in the pier; 5, embedding a steel plate in a bearing platform; 6-high strength bolt; 7-bolt hole; 8, upper segment projection; 9-lower convex groove; 10-a cushion cap funnel-shaped preformed groove; 11-grouting port; 12-exhaust hole; 13-upper pier steel plate hoops; 14-a first shear pin; 15-lower pier steel plate hoops; 16-casting concrete on a bearing platform in situ; 17-a capping beam; 18-a support; 19-second shear pin.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The key technology of the invention is as follows: the accurate butt joint of the cushion cap preformed groove of lower prefabricated pier and cast-in-place cushion cap, the accurate butt joint of upper prefabricated pier and lower prefabricated pier, the bolt of pier embedded steel sheet and cushion cap embedded steel sheet connect, the wet of junction connects after upper and lower prefabricated pier hoist and mount.
as shown in fig. 1, the prefabricated assembled segmental pier structure mainly comprises an upper segment prefabricated pier 1, a lower segment prefabricated pier 2 and a cast-in-place bearing platform 3.
the upper surface of the cast-in-place pile cap 3 is provided with a pile cap preformed groove 10 with an upward opening, the lower part of the lower prefabricated pier 2 is pre-embedded with a lower pier steel plate hoop 15, the outer surface of the lower part of the lower pier steel plate hoop 15 is provided with a first shear nail 14, and the lower prefabricated pier has a certain concrete protective layer thickness and is used for increasing the binding force between the lower prefabricated pier 2 and cast-in-place concrete. During assembly, the lower part of the lower prefabricated pier 2 is arranged in the bearing platform preformed groove 10. In this embodiment, the cross section of the cushion cap preformed groove 10 gradually increases from bottom to top, the bottom surface of the cushion cap preformed groove 10 is matched with the bottom surface of the lower prefabricated pier 2, and during assembly, after the lower part of the lower prefabricated pier 2 is placed in the cushion cap preformed groove 10, rapid-hardening high-strength concrete is poured into a gap between the cast-in-place cushion cap 3 and the lower prefabricated pier 2 to form the cushion cap cast-in-place concrete 16.
as shown in fig. 1 and 2, a bearing platform embedded steel plate 5 is arranged at the top of a cast-in-place bearing platform 3, a lower pier embedded steel plate 4 is arranged on the outer surface of the upper portion of a lower pier steel plate hoop 15, the bearing platform embedded steel plate 5 and the lower pier embedded steel plate 4 are arranged in a one-to-one correspondence mode and are respectively provided with bolt holes 7, when the bridge pier is assembled, after the lower portion of the lower prefabricated pier 2 is arranged in a bearing platform reserved groove 10, the lower pier embedded steel plate 4 is located above the cast-in-place bearing platform 3, the bearing platform embedded steel plate 5 and the lower pier embedded steel plate 4 are fastened through bolts 6, and integrity is. In this embodiment, the pre-buried steel sheet 4 of lower section pier is right angle triangle steel sheet and rectangle steel sheet combination formula steel sheet, two right angle triangle steel sheets of perpendicular connection on the rectangle steel sheet, and two right angle triangle steel sheets adopt two-sided welded mode to be connected with a rectangle steel sheet to set up bolt hole 7 on the rectangle steel sheet of right angle triangle steel sheet both sides, cushion cap pre-buried steel sheet 5 is the rectangle steel sheet the same with rectangle steel sheet size in the pre-buried steel sheet 4 of lower section pier. In this embodiment, two lower pier embedded steel plates 4 are welded to each side of the lower pier steel plate hoop 15 in the horizontal direction, and one lower pier embedded steel plate 4 is welded to each side of the longitudinal bridge. The lower pier pre-embedded steel plate 4 and the lower pier steel plate hoop 15 are welded in a double-sided welding mode; and 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 provided at a sixth division point of the pier top of the lower prefabricated pier 2, the upper part is above the sixth division point of the pier top, and the lower part is below the sixth division point of the pier top, and the variable cross section is realized by a special template, namely a step is formed on the inner side of the lower prefabricated pier 2. The transverse bridge of the lower prefabricated pier 2 is provided with a lower pier bulge at the middle position of the lateral side, the lower pier bulge is longitudinally arranged and extends to the position where the upper surface of the lower prefabricated pier 2 is parallel and level with the upper surface of the cast-in-place bearing platform 3 from the top of the lower prefabricated pier 2, and the upper part of the lower pier bulge is in a convex groove structure, so that a lower pier groove 9 is formed and is similar to a mortise. The upper end face of the lower section of the pier groove 9 is flush with the upper end face of the lower section of the prefabricated pier 2, the lower end face of the lower section of the pier groove 9 is flush with the step face of the inner side step of the lower section of the prefabricated pier 2, and the lower section of the pier groove 9 is communicated with the hollow structure at the upper part of the lower section of the prefabricated pier 2. As shown in fig. 3, grouting holes 11 are formed in two sides of a lower section pier groove 9 on the large pile side of the lower section prefabricated pier 2, exhaust holes 12 are formed in two sides of the lower section pier groove 9 on the small pile side, and the exhaust holes 12 are higher than the grouting holes 11, so that grouting construction after assembly of the upper section prefabricated pier and the lower section prefabricated pier is completed is facilitated.
As shown in fig. 4, a variable cross section is arranged at a sixth-point pier bottom of the upper-section prefabricated pier 1, the upper part is above the sixth-point pier bottom, the lower part is below the sixth-point pier bottom, and the variable cross section is realized by a special template, namely, a step is formed on the periphery of the upper-section prefabricated pier 1. The upper section of the prefabricated pier 1 is provided with an upper section of pier protrusion in the axial direction of the transverse bridge of the upper section of the prefabricated pier 1, the upper section of the pier protrusion is longitudinally arranged and extends to the bottom of the upper section of the prefabricated pier 1 from the top of the upper section of the prefabricated pier 1, an upper section of pier protruding strip 8 is formed after the lower section of the upper section of the pier protrusion is variable in cross section and is similar to a tenon, the size of the upper section of pier protruding strip 8 is identical to that of a lower section of pier groove 9, and the lower outer contour of the upper section of the prefabricated pier 1 is.
An upper pier steel plate hoop 13 is pre-buried at the lower part of the upper prefabricated pier 1, a second shear nail 19 is arranged on the outer surface of the upper pier steel plate hoop 13, and the upper pier steel plate hoop has a certain concrete protective layer thickness and is used for increasing the bonding force between the upper prefabricated pier 1 and cast-in-place concrete.
In this embodiment, the upper prefabricated pier 1 and the lower prefabricated pier 2 are both thin-walled hollow structures.
During the assembly, the lower part of the prefabricated pier 1 of the upper segment is inserted into the upper cavity of the prefabricated pier 2 of the lower segment, the convex strip 8 of the pier of the upper segment is inserted into the groove 9 of the pier of the lower segment, the bottom of the prefabricated pier 1 of the upper segment is arranged on the step inside the prefabricated pier 2 of the lower segment, then grouting is carried out from the grouting opening, namely, concrete is injected, and the integrity of the structure is improved through grouting.
The top of the upper prefabricated pier 1 is provided with a capping beam 17, the upper prefabricated pier 1 and the capping beam 17 are integrally prefabricated, and the top of the capping beam is provided with a support 18.
The construction method comprises the following steps: the construction method comprises the steps of pouring a cast-in-place bearing platform 3 on a construction site, prefabricating an upper prefabricated pier 1 and a lower prefabricated pier 2 in a prefabricating factory, and assembling the piers after maintenance is finished. During hoisting, the lower prefabricated thin-wall hollow pier 2 is installed firstly, after the lower prefabricated thin-wall hollow pier 2 is hoisted into the bearing platform reserved groove 10, the lower pier pre-embedded steel plate 4 and the bearing platform pre-embedded steel plate 5 are fastened through the bolt 6, then rapid-hardening high-strength concrete is poured into a gap between the bearing platform reserved groove 10 and the lower prefabricated pier 2, and finally the upper prefabricated pier 1 is hoisted and grouted from the lowest grouting hole 11.
The specific construction method comprises the following steps:
Firstly, realizing section change of a lower prefabricated pier 2 and projection and convex grooves of a transverse bridge to the lower prefabricated pier through a specially-made template, arranging a lower pier steel plate hoop 15 with shear nails at the lower part of the lower prefabricated pier 2, welding the lower pier steel plate hoop 15 with the main ribs in the lower prefabricated pier 2, welding the lower pier steel plate hoop 15 with the lower pier steel plate hoop 4 at the position of an embedded lower pier steel plate 4, pouring concrete, and prefabricating an upper prefabricated pier 1 and the lower prefabricated pier 2 in a factory;
And step two, casting the cast-in-situ bearing platform 3 in situ, wherein a bearing platform reserved groove 10 is formed in the top of the cast-in-situ bearing platform 3, the bottom surface of the bearing platform reserved groove 10 is the same as the bottom surface of the lower section of prefabricated pier 2 in size, and a rectangular steel plate with a bolt hole 7 is embedded in the position, corresponding to the embedded steel plate 4 of the lower section of pier, of the top surface of the cast-in-situ bearing platform 3.
And step three, accurately hoisting the prefabricated lower prefabricated pier 2 to the position above the cast-in-place bearing platform 3 by using a crane, and slowly dropping after finishing positioning until the prefabricated lower pier 2 enters the cast-in-place bearing platform 3 by the specified depth.
And step four, connecting the bearing platform embedded steel plate 5 with the lower pier embedded steel plate 4 through bolts 6.
And step five, filling fast-hardening high-strength concrete in the gap between the funnel-shaped cushion cap preformed groove 10 and the lower prefabricated pier 2.
And sixthly, after the cast-in-place concrete of the cast-in-place cushion cap 3 reaches 80% of the design strength, accurately hoisting the upper prefabricated pier 1 to the position above the lower prefabricated pier 2 by using a crane, and slowly descending the upper prefabricated pier 1 after the bulge of the upper pier is accurately butted with the convex groove of the lower prefabricated pier until the lower part of the variable cross section of the upper prefabricated pier 1 completely enters the upper cavity of the lower prefabricated pier 2.
And seventhly, hanging the upper prefabricated pier 1 into a cavity at the upper part of the lower prefabricated pier 2, and pouring high-strength concrete from a transverse bridge of the lower prefabricated pier 2 to a large pile size side grout pressing port 11 through accurate butt joint of a convex strip 8 of the upper prefabricated pier and a groove 9 of the lower prefabricated pier until the grout flows out from a highest vent hole 12 at the other side and the flowing consistency reaches the injected consistency.
and step eight, checking whether the connection between the cast-in-place bearing platform 3 and the lower prefabricated pier 2 and the connection between the lower prefabricated pier 2 and the upper prefabricated pier 1 meet the design requirements.
The main benefits of the invention are: the standardization, industrialization and assembly of the construction process are realized by prefabricating the upper section of pier, the lower section of pier and other accessory components in a factory. Through carrying out the segmentation prefabrication with large-scale pier, realized the maximization of prefabrication construction, can satisfy the quick construction requirement of high mound bridge, reduced construction's cycle greatly, promoted engineering quality, reduced the adverse effect to urban traffic, environment in the work progress. Compared with the existing fabricated prefabricated pier structure and construction method, the capping beam and the pier are integrally prefabricated, so that the structural integrity is improved, and the construction process of splicing is reduced; the pier cross bridge establishes class tenon fourth of twelve earthly branches structure to the side, and accurate location when being convenient for hoist and mount promotes the efficiency of construction greatly. The system is simple in 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 cushion cap embedded steel plate are bolted in a single-face friction mode, and wet connection modes are adopted between the upper pier and the lower pier and between the funnel-shaped preformed groove and the pier stud, so that connection is firmer and more reliable. The requirements of safety, high efficiency, environmental protection, durability, economy and sustainable development are realized.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the contents of the present specification and the drawings, or applied to the related technical fields directly or indirectly, are included in the scope of the present invention.
Claims (10)
1. The prefabricated assembled sectional type bridge pier structure is characterized by comprising an upper prefabricated bridge pier (1), a lower prefabricated bridge pier (2) and a cast-in-place bearing platform (3);
a cushion cap reserved groove (10) is formed in the upper surface of the cast-in-place cushion cap (3), and during assembly, the lower portion of the lower prefabricated pier (2) is placed in the cushion cap reserved groove (10) and fixed;
the upper part of the lower prefabricated pier (2) is of a hollow structure, and a step is formed on the inner side of the lower prefabricated pier (2); a lower section of pier groove (9) is longitudinally arranged on the upper part of the lateral side of the transverse bridge of the lower section of prefabricated pier (2), the upper end surface of the lower section of pier groove (9) is flush with the upper end surface of the lower section of prefabricated pier (2), the lower end surface of the lower section of pier groove (9) is flush with the step surface of the step on the inner side of the lower section of prefabricated pier (2), and the lower section of pier groove (9) is communicated with the hollow structure on the upper part of the lower section of prefabricated pier (2); the upper prefabricated pier (1) is arranged in a variable cross section from top to bottom, the upper section area of the upper prefabricated pier (1) is larger than the lower section area, and a step is formed on the periphery of the upper prefabricated pier (1); an upper section of pier protruding strip (8) is longitudinally arranged on the lower portion of the lateral side of a transverse bridge of an upper section of prefabricated pier (1), the upper end surface of the upper section of pier protruding strip (8) is overlapped with the step surface of the peripheral step of the upper section of prefabricated pier (1), the lower end surface of the upper section of pier protruding strip (8) is flush with the lower end surface of the upper section of prefabricated pier (1), and the upper section of pier protruding strip (8) is matched with a lower section of pier groove (9); during assembly, the lower part of an upper prefabricated pier (1) is inserted into the upper hollow structure of a lower prefabricated pier (2), an upper pier convex strip (8) is inserted into a lower pier groove (9), the bottom of the upper prefabricated pier (1) is arranged on a step on the inner side of the lower prefabricated pier (2) and fixed, and the step surface of the upper step of the upper prefabricated pier (1) is arranged on the top end surface of the lower prefabricated pier (2).
2. the prefabricated assembled segmental pier structure according to claim 1, wherein 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 nail (14) is arranged on the outer surface of the lower part of the lower segment pier steel plate hoop (15); the cross section of the bearing platform preformed groove (10) is gradually increased from bottom to top, the bottom surface of the bearing platform preformed groove (10) is the same as the bottom surface of the lower prefabricated pier (2), and during assembly, after the lower part of the lower prefabricated pier (2) is placed in the bearing platform preformed groove (10), concrete is poured into a gap between the cast-in-place bearing platform (3) and the lower prefabricated pier (2).
3. The prefabricated assembled segmental pier structure according to claim 1, wherein a lower segment pier steel plate hoop (15) is embedded at the lower part of the lower segment prefabricated pier (2), and a lower segment pier embedded steel plate (4) is arranged on the upper outer surface of the lower segment pier steel plate hoop (15); the top of the cast-in-place bearing platform (3) is provided with a bearing platform embedded steel plate (5), and the bearing platform embedded steel plate (5) and the lower pier embedded steel plate (4) are arranged in a one-to-one correspondence manner; during assembly, after the lower part of the lower prefabricated pier (2) is arranged in the bearing platform reserved groove (10), the lower pier embedded steel plate (4) is positioned above the cast-in-place bearing platform (3), and the bearing platform embedded steel plate (5) and the lower pier embedded steel plate (4) are connected through the bolts (6).
4. The prefabricated assembled segmental pier structure according to claim 1, wherein lower segmental pier bulges are arranged on the lateral sides of a transverse bridge of the lower segmental prefabricated pier (2), are longitudinally arranged and extend from the top of the lower segmental prefabricated pier (2) to the position where the lower segmental prefabricated pier (2) is flush with the upper surface of a cast-in-place bearing platform (3), and are arranged in a convex-concave structure to form lower segmental pier grooves (9); the lateral side of the transverse bridge of the upper prefabricated pier (1) is provided with an upper pier bulge, the upper pier bulge is longitudinally arranged and extends from the top of the upper prefabricated pier (1) to the bottom of the upper prefabricated pier (1), and the lower variable cross section of the upper pier bulge forms an upper pier convex strip (8).
5. The prefabricated assembled segmental pier structure according to claim 1, wherein the outer contour of the lower part of the upper segmental prefabricated pier (1) is smaller than the inner contour of the upper part of the lower segmental prefabricated pier (2); an upper pier steel plate hoop (13) is pre-buried at the lower part of the upper prefabricated pier (1), and a second shear nail (19) is arranged on the outer surface of the upper pier steel plate hoop (13); the upper part of the lower prefabricated pier (2) is provided with a grout pressing port (11) and an exhaust hole (12), and the exhaust hole (12) is higher than the grout pressing port (11); during assembly, after the lower part of the upper prefabricated pier (1) is inserted into the upper hollow structure of the lower prefabricated pier (2), concrete is injected from the grouting opening (11).
6. the precast sectional pier construction according to claim 1, wherein the grout pressing port (11) is provided at a side of a large pile of the lower precast pier (2), and the exhaust hole (12) is provided at a side of a small pile of the lower precast pier (2).
7. the precast assembled segmental pier structure according to claim 1, wherein a capping beam (17) is arranged at the top of the upper segment precast pier (1), and the upper segment precast pier (1) and the capping beam (17) are arranged in an integrated structure.
8. the prefabricated assembled segmental pier structure according to claim 1, wherein the upper segmental prefabricated pier (1) is of a hollow structure; the lower part of the lower prefabricated pier (2) is of a hollow structure, the lower 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 prefabricated pier (2).
9. The construction method of the precast sectional pier construction of any one of claims 1 to 8, it is characterized in that an upper prefabricated pier (1) and a lower prefabricated pier (2) are prefabricated in a prefabrication factory, pouring a cast-in-place bearing platform (3) in a construction site, transporting an upper prefabricated pier (1) and a lower prefabricated pier (2) to the construction site, the lower prefabricated pier (2) is hoisted into the bearing platform preformed groove (10) of the cast-in-place bearing platform (3) and is connected and fixed by positioning through the bearing platform preformed groove (10) of the cast-in-place bearing platform (3), the upper prefabricated pier (1) is hoisted by positioning the upper pier convex strips (8) and the lower pier grooves (9), so that the lower part of the upper prefabricated pier (1) is inserted into the upper hollow structure of the lower prefabricated pier (2), and the upper pier convex strips (8) are inserted into the lower pier grooves (9).
10. the construction method of the prefabricated assembled segmental pier structure according to claim 9, wherein in the prefabricated assembled segmental pier structure, a lower segment pier steel plate hoop (15) is pre-embedded at the lower part of a lower segment prefabricated pier (2), and a first shear nail (14) is arranged on the outer surface of the lower part of the lower segment pier steel plate hoop (15); the cross section of the bearing platform preformed groove (10) is gradually increased from bottom to top, and the size of the bottom surface of the bearing platform preformed groove (10) is the same as that of the bottom surface of the lower prefabricated pier (2); the outer contour of the lower part of the upper prefabricated pier (1) is smaller than the inner contour of the upper part of the lower prefabricated pier (2); an upper pier steel plate hoop (13) is pre-buried at the lower part of the upper prefabricated pier (1), and a second shear nail (19) is arranged on the outer surface of the upper pier steel plate hoop (13); the upper part of the lower prefabricated pier (2) is provided with a grout pressing port (11) and an exhaust hole (12), and the exhaust hole (12) is higher than the grout pressing port (11);
the specific construction method comprises the following steps:
Firstly, prefabricating an upper prefabricated pier (1) and a lower prefabricated pier (2) in a factory through a special template;
step two, adopting cast-in-place concrete to cast a cast-in-place bearing platform (3) on a construction site;
hoisting the prefabricated lower prefabricated pier (2) to the position above a cast-in-place bearing platform (3), and falling down after finishing positioning until the bottom of the lower prefabricated pier (2) contacts the bottom surface of a bearing platform reserved groove (10);
filling concrete into a gap between the cast-in-place bearing platform (3) and the lower prefabricated 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 prefabricated pier (1) to the position above the lower prefabricated pier (2), and after the upper pier protruding strips (8) and the lower pier grooves (9) are accurately butted, descending the upper prefabricated pier (1) until the part below the step of the upper prefabricated pier (1) completely enters the hollow structure at the upper part of the lower prefabricated pier (2);
And sixthly, pouring concrete from the grouting opening (11) of the lower prefabricated pier (2) until the concrete flows out from the exhaust hole (12) and the flowing consistency reaches the filling consistency.
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