CN113106847A - Full-length tied-in-bundle steel bar connection type segment prefabricated assembled pier and construction method - Google Patents
Full-length tied-in-bundle steel bar connection type segment prefabricated assembled pier and construction method Download PDFInfo
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- CN113106847A CN113106847A CN202010030384.7A CN202010030384A CN113106847A CN 113106847 A CN113106847 A CN 113106847A CN 202010030384 A CN202010030384 A CN 202010030384A CN 113106847 A CN113106847 A CN 113106847A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a full-length cluster steel bar connection type segment prefabricated assembled pier and a construction method thereof. The connecting steel bar sections are arranged in a through length mode, and steel bar joints can be omitted or arranged in a small quantity; the number of the bunched reinforcing steel bars is small, and the construction is convenient; the segments are assembled firstly and then the reinforcing steel bars are inserted, so that the segments are aligned quickly and the reinforcing steel bars are inserted conveniently; the steel bars are anchored by the post-grouting slurry, so that the connection of the foundation, the top cap and the pier stud is realized, and the connection of the whole structure is firm; is suitable for piers with high height and large size.
Description
Technical Field
The invention relates to the technical field of bridge structure buildings, in particular to a full-length bundled steel bar connection type segment prefabricated assembled pier and a construction method.
Background
Along with the deepening of bridge intelligence and green construction idea, the segment prefabricated assembled pier has the advantages of small interference to the surrounding environment, quick construction, high quality of prefabricated segments and the like, and is gradually and widely applied to the field of bridge construction.
The common steel bar sleeve grouting connection technology for the segment prefabricated spliced pier needs to embed a grouting sleeve and a reserved steel bar joint in a prefabricated segment, and is high in installation precision and construction requirements. The joints are arranged on each reinforcing steel bar, and when the multi-section assembling is adopted, the joints are more, the cost is high, and the implementation difficulty is large. Another common connecting technology for segment prefabricated assembled piers is prestressed beam connection, through holes are reserved in segments, prestressed steel strands are penetrated to form connection between the segments, the connection needs to stretch prestress, loss and failure risks exist in the prestress, the cost is high, the prestress is not suitable for high-earthquake areas, and the defects exist in the same way. Aiming at the defects of the prior connecting technology, the problem to be solved urgently is to develop a segment prefabricated assembled pier adopting a through long bundled steel bar connection type and a construction method thereof.
Disclosure of Invention
In view of the above, the present invention is directed to a full-length bundled steel bar connection type segment prefabricated assembled pier and a construction method thereof, wherein the pier connection structure avoids excessive steel bar connection joints, avoids prestress loss and failure risk without prestress, and has the advantages of fewer steel bar joints, fewer reserved hole channels on the cross section, large construction tolerance error, low cost, high speed, and the like.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides an adopt to lead to prefabricated pier of assembling of long steel bar connection formula festival section, the cross-section adopts solid or hollow, includes at the basis of job site pouring, at prefabricated hood festival section and a plurality of prefabricated pier shaft festival section of prefabricated factory production all be provided with a plurality of reservation canals in basis, prefabricated pier shaft festival section and the prefabricated hood festival section, basis, a plurality of prefabricated pier shaft festival sections, prefabricated hood festival section splice in proper order through seam bonding material, the reservation canals one-to-one setting on basis, a plurality of prefabricated pier shaft festival sections and the prefabricated hood festival, each corresponds the setting run through respectively in the reservation canals and be provided with steel bar tied in a bundle, pour or pour the back to the reservation canals again and pour thick liquids.
Furthermore, in order to prevent the joint bonding material from entering the reserved hole channel, hole channel sealing rings are arranged on the periphery of the reserved hole channel of the adjacent end surfaces of the foundation and the prefabricated pier body sections, the adjacent end surfaces between the prefabricated pier body sections and the adjacent end surfaces of the prefabricated pier body sections and the prefabricated top cap sections, the hole channel sealing rings can be rubber pads, and the size and the shape of the hole channel sealing rings are matched with those of the reserved hole channel.
Further, the reinforcing bar tied in a bundle is the steel reinforcement cage of compriseing a plurality of main muscle and stirrup, the steel reinforcement cage is circular or rectangle, and is unanimous with the reservation pore shape, through many main muscle of stirrup fixation, main muscle diameter can generally adopt 16 ~ 40mm, and main muscle radical should be at 2 and above, at the non-preformed hole position of a plurality of prefabricated pier shaft sections and prefabricated hood sections, arranges the interior distribution reinforcing bar of the section of minor diameter, and the distribution reinforcing bar is arranged inside each section, does not pass through the concatenation seam, satisfies the atress needs of each section non-seam position.
Furthermore, all be equipped with the shear force key on the adjacent terminal surface of prefabricated pier shaft festival section and prefabricated hood festival section and the adjacent terminal surface between prefabricated pier shaft festival section, adopt high-strength mortar or ultra high performance concrete to connect between basis and the prefabricated pier shaft festival section, adopt epoxy glue to connect between a plurality of prefabricated pier shaft festival sections, between prefabricated pier shaft festival section and the prefabricated hood festival.
Further, the post-pouring slurry refers to slurry poured or poured into the reserved hole channels of the foundation, the plurality of prefabricated pier body sections and the prefabricated top cap sections, and high-strength pressure slurry, ultrahigh-performance concrete or self-compacting compensation shrinkage concrete and the like are adopted.
Furthermore, the reserved hole channel is formed by a metal corrugated pipe or a scabbed and a restriction ring.
Furthermore, the roughening is to chisel rough surfaces around the reserved hole, and spiral rib-shaped restraining rings are distributed on the outer surface around the hole along the whole height direction.
A construction method for prefabricating and assembling piers by adopting the full-length steel bar bundle connecting type segments comprises the following steps:
the method comprises the following steps: the construction method comprises the steps of prefabricating a plurality of prefabricated pier body sections and prefabricated top cap sections in a prefabrication factory on a cast-in-place construction foundation on site, reserving pore channels on the foundation, the prefabricated pier body sections and the prefabricated top cap sections, and processing required bundled steel bars.
Step two: transporting the prefabricated pier body segment, the prefabricated top cap segment and the bundled steel bars to a bridge site from a prefabrication factory through transportation equipment; corresponding the preformed pier body segment preformed holes to the preformed holes between the foundations one by one, smearing bonding materials, and installing the preformed pier body segments; and a plurality of prefabricated pier body sections and prefabricated top cap sections are sequentially installed in the same way, and the assembly of the foundation, the prefabricated pier body sections and the prefabricated top cap sections is completed.
Step three: and hoisting the bunched steel bars one by one, penetrating the prefabricated top cap segment, the prefabricated pier body segment and the reserved hole channel of the foundation from top to bottom from the top of the prefabricated top cap segment, and facilitating hoisting and installation due to certain rigidity of the bunched steel bars. When the pier is short, the vertical steel bars of the whole cluster steel bars are whole steel bars without lengthening, and the vertical steel bars are temporarily fixed at the pier top after penetrating; when the pier is high, the bunched steel bars can be lengthened one by one, the steel bars can be lengthened by adopting mechanical connection or welding, namely, the bunched steel bars are temporarily fixed on the top of the pier after penetrating into the first section of bunched steel bars, then are lengthened by the second section of bunched steel bars, and the whole steel bars are penetrated to the designed position after the lengthening is completed.
Step four: and pouring or pouring the post-pouring slurry into the reserved hole channel, maintaining, and cutting off the grouting pipe of the exposed part of all the structures.
Step five: and (5) grouting slurry after curing, forming an integral structure after reaching the strength, and completing construction of prefabricating and assembling the pier by adopting the full-length tied steel bar connection type segments.
Furthermore, the post-pouring slurry can be poured or poured in three ways, and different materials and schemes can be flexibly selected according to actual construction conditions:
a. and reserving a grouting hole at the bottom of the foundation corresponding to the reserved hole channel, pouring the slurry into the whole reserved hole channel from bottom to top through the reserved grouting hole, finishing grouting when the slurry flows out from the top, and adopting high-strength grouting for the slurry.
b. A grouting hole is reserved at the bottom of the foundation corresponding to the reserved hole passage, and slurry is poured into the reserved hole passage in the foundation from bottom to top through the reserved grouting hole, wherein the grouting material can be ultra-high performance concrete, and the ultra-high performance concrete utilizes the strong bond strength of the ultra-high performance concrete, so that the length of the reserved hole passage in the foundation is reduced and the anchoring safety is enhanced; similar to the setting method of the reserved grouting holes at the foundation 1, a second row of grouting holes are reserved in the corresponding reserved pore channels at the bottom sections of the piers, slurry is poured into the rest reserved pore channels from bottom to top through the reserved grouting holes, secondary grouting is conducted, the secondary grouting can also play a role in strengthening the primary grouting, the compactness of the primary grouting is enhanced, the grouting is completed when the secondary grouting slurry flows out of the reserved pore channels at the top of the pier, and the slurry can adopt high-strength grouting material so as to save the cost.
c. At prefabricated hood segment top, adopt the mode of pouring, top-down concreting, wherein, the concrete can adopt self-compaction compensation shrink concrete, realizes self-compaction and exempts from the vibration, and the construction is simple and convenient.
Further, in the second step, the prefabricated pier body segment and the foundation, the prefabricated pier body segment and the prefabricated top cap segment are assembled in the following mode:
paving a joint bonding material on the top surface of the foundation, wherein the joint bonding material is high-strength mortar or ultra-high-performance concrete, the thickness of the joint bonding material is generally 2-3 cm, the connection between the foundation and the prefabricated pier body section non-matching manufacturing component is facilitated, and the function of adjusting the flatness is achieved; mounting a pore sealing ring around a reserved pore of the adjacent end surfaces of the foundation and the prefabricated pier body section, hoisting the prefabricated pier body bottom section in place, and connecting the foundation and the prefabricated pier body bottom section by adopting a slurry setting method;
laying bonding material on the top surface of the lower segment of the prefabricated pier body, wherein the bonding material is epoxy resin glue, the thickness of the bonding material is generally 2-3 mm, the epoxy resin glue is used for connecting the segments into a whole, the functions of water resistance, sealing and the like are achieved, and the durability of seams is improved. Mounting a pore sealing ring around a reserved pore of the adjacent end surface between the prefabricated pier body sections, sequentially mounting a plurality of pier body sections, and prepressing epoxy resin glue to realize the connection between the prefabricated pier body sections;
laying bonding material at prefabricated pier shaft top surface, bonding material adopts epoxy glue, and thickness is 2 ~ 3mm generally, and epoxy glue connects into whole between the festival section, and plays effects such as waterproof, sealed, increases the durability between the seam. And mounting a pore sealing ring around the reserved pore of the adjacent end surfaces of the prefabricated pier body segment and the prefabricated top cap segment, mounting the prefabricated top cap segment, and prepressing epoxy resin glue to realize the connection between the prefabricated top cap segment and the prefabricated pier body segment.
Compared with the prior art, the full-length tied steel bar connecting type segment prefabricated assembled pier and the construction method have the following advantages:
(1) through long steel bars are arranged among the foundation, the plurality of prefabricated pier stud sections and the prefabricated top cap sections, the arrangement of a steel bar joint among all the sections is avoided, the connection is reliable, the construction is convenient, and the pier is suitable for piers with high heights and large sizes; meanwhile, joints among the sections are connected by epoxy resin glue or ultra-high performance concrete, and the durability among the sections is improved.
(2) The connecting steel bars adopt the bundled steel bars, the steel bar cage is composed of a plurality of main bars and stirrups, the reinforcement content of a single bundled steel bar is high, the number of reserved channels on the section can be obviously reduced under the condition that the reinforcement distribution rate of the total reinforcement of the full-section is not reduced, and the construction is more convenient; particularly, when the pier is a hollow pier, the same steel bars can realize the simultaneous connection of the steel bars on the inner side and the outer side of the pier wall, so that the inconvenience of the construction alignment of the respective connection is avoided; meanwhile, when the pier is high, the reinforcement cage can be lengthened and then placed into the reserved hole channel, so that the steel reinforcement cage is suitable for a high pier structure.
(3) The steel bar connection adopts the form of reserving the hole channel and then penetrating the steel bar, the size of the reserved hole channel can be flexibly set, the penetration construction tolerance of the steel bar is large, and the site construction and the precision control are convenient.
(4) During construction, the precast concrete segments are assembled firstly, then the connecting steel bars are constructed, the steel bar joints are not required to be aligned when the precast concrete segments are assembled, the reserved hole channels are only ensured to be in one-to-one correspondence, and the assembling speed is high, and the segment alignment is convenient.
(5) Through set up the reservation pore in foundation, prefabricated hood festival section, penetrate the reinforcing bar tied in a bundle, fill the thick liquids behind the rethread and anchor the reinforcing bar, realize being connected of foundation, hood and pier stud, overall structure connects firmly.
(6) During construction, the reserved hole is grouted or concreted, the materials can adopt high-strength grouting materials, ultrahigh-performance concrete, self-compacting shrinkage-compensating concrete and the like, different modes such as bottom-to-top grouting or top-to-bottom concreting and the like can be adopted, the construction method is flexible, and the construction method can be flexibly selected according to the field condition.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural view of a spliced pier of the invention;
fig. 2 is a cross sectional view of the assembled pier when the reserved hole is circular;
fig. 3 is a cross sectional view of the assembled pier when the reserved hole channels are rectangular;
fig. 4 is a schematic view of assembled pier reinforcing bars when the reserved hole is circular, wherein a is a schematic view of a cross section of the assembled pier reinforcing bars when the reserved hole is circular;
fig. 5 is a schematic view of assembled pier reinforcing bars when the reserved hole is rectangular, wherein B is a schematic view of a cross section of the assembled pier reinforcing bars when the reserved hole is rectangular;
fig. 6 is a schematic view of the assembly of the assembled pier and post grouting.
Description of reference numerals:
1. a foundation; 2. prefabricating pier body sections; 3. prefabricating a top cap segment; 4. reserving a pore channel; 5. a joint bonding material; 6. bundling reinforcing steel bars; 7. reinforcing steel bars are distributed in the segments; 8. then pouring slurry; 9. reserving a grouting hole; 10. a pore sealing ring;
41 a metal bellows; 42 a confinement ring;
61 main ribs; 62 hooping; 63 lengthening the steel bars;
81 high-strength pressure slurry; 82 ultra high performance concrete; 83 self-compacting compensated shrinkage concrete.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in figure 1, the section of the pier is solid or hollow, the pier comprises a bearing platform foundation 1 poured on a construction site, a prefabricated top cap section 3 and a plurality of prefabricated pier body sections 2 produced in a prefabrication factory, a plurality of reserved holes 4 are formed in the foundation 1, the prefabricated pier body sections 2 and the prefabricated top cap sections 3, the foundation 1, the prefabricated pier body sections 2 and the prefabricated top cap sections 3 are sequentially spliced, seam bonding materials 5 are coated at the splicing positions, the plane positions of the reserved holes 4 in the foundation 1, the prefabricated pier body sections 2 and the prefabricated top cap sections 3 correspond to one another one by one, a cluster steel bar 6 penetrates through the reserved holes 4 correspondingly, and slurry 8 is poured or poured into the reserved holes 4.
All be equipped with the shear force key on the adjacent terminal surface of prefabricated pier shaft section 2 and prefabricated top cap section 3 and the adjacent terminal surface between prefabricated pier shaft section 3, the shear force key adopts conventional concrete unsmooth shear force key. Foundation 1, a plurality of prefabricated pier shaft segment 2 and prefabricated hood segment 3 assemble in proper order, through scribble joint bonding material 5 on lower section, assemble the section again, treat joint bonding material 5 maintenance completion back, realize the reliable connection of upper and lower section. The foundation 1 and the prefabricated pier body sections 2 are connected by high-strength mortar or ultra-high-performance concrete, the thickness is generally 2-3 cm, the connection between non-matching manufacturing components of the foundation and the prefabricated pier body sections 2 is facilitated, and the effect of adjusting the flatness is achieved; adopt epoxy to glue between a plurality of prefabricated pier shaft sections 2, prefabricated pier shaft section 2 and the prefabricated hood section 3 and connect, thickness generally is 2 ~ 3mm, and epoxy glues and connects into whole between with the section, and plays effects such as waterproof, sealed, increases the durability between the seam.
Before the splicing of the later prefabricated segment, joint bonding material 5 needs to be laid on the surface of the previous prefabricated segment, in order to prevent the joint bonding material 5 from entering the reserved hole 4, hole sealing rings 10 are arranged around the reserved hole 4 of the adjacent end surfaces of the foundation 1 and the prefabricated pier body segment 2, the adjacent end surfaces between the prefabricated pier body segments 2 and the prefabricated top cap segment 3, the hole sealing rings 10 can be rubber pads, the size and the shape of the hole sealing rings are matched with the reserved hole 4, the joint bonding material 5 is effectively prevented from entering the reserved hole 4, and the rear grouting effect is ensured.
As shown in fig. 2, reserved hole channels 4 are respectively arranged on the foundation 1, the prefabricated pier body sections 2 and the prefabricated top cap sections 3, the plane positions of the reserved hole channels 4 are in one-to-one correspondence, and the reserved hole channels 4 are formed in a special metal corrugated pipe 41 mode or a chiseling and restraining ring 42 mode. The roughening is to chisel rough surfaces around the reserved hole, the restraining ring adopts a mode of arranging spiral ribs around the hole along the height direction of the whole hole, the hoop effect is enhanced, when the reinforcing steel bars inside the hole are stressed, the restraining ring spiral ribs form the restraining hoop effect on the whole reserved hole, and combination between the post grouting material and the prefabricated section is facilitated. The preformed hole 4 is circular or rectangular in shape.
As shown in fig. 3, a bundling reinforcement 6 is inserted into the reserved passage 4, and the bundling reinforcement 6 is a reinforcement cage composed of a plurality of main reinforcements 61 and stirrups 62, and the reinforcement cage is circular or rectangular and has the same shape as the reserved passage 4. A plurality of main reinforcements 61 are fixed through stirrups 62, the diameter of each main reinforcement 61 can be generally 16-40 mm, the number of the main reinforcements 61 is 2 or more, and the number of reserved holes in the sections and the number of bundled reinforcement cages are reduced by bundling the reinforcements under the condition of ensuring the reinforcement ratio of the sections. Particularly, when the pier stud adopts a hollow pier, the rectangular reinforcement cage can simultaneously realize the connection of the outside and inside reinforcements of the wall of the hollow pier, and the inconvenience of construction alignment of respective connection is avoided. The single bundled steel bar has higher bar content, can obviously reduce the number of reserved holes on the section under the condition that the total bar distribution rate of the full-section total steel bar is not reduced, and is more convenient to construct. The outline of the bunched steel bar 6 is about 3cm smaller than each side of the reserved hole 4, a certain construction error is reserved, and the bunched steel bar can conveniently and smoothly penetrate through the hole. Meanwhile, at the positions of the non-reserved holes of the prefabricated pier shaft sections 2 and the prefabricated top cap sections 3, the small-diameter sections are internally distributed with the distributed steel bars 7, and the distributed steel bars 7 are arranged inside the sections and do not pass through splicing seams, so that the stress requirement of the non-joint positions of the sections is met.
The cluster steel bars 6 are hoisted and penetrate into the reserved hole channels 4 from top to bottom, and the cluster steel bars have certain rigidity, so that hoisting and installation are facilitated. When the pier is short, the whole steel bar of the whole cluster steel bar 6 is a vertical steel bar, and does not need to be lengthened, when the pier is high, the cluster steel bar 6 needs to be temporarily fixed on the top of the pier to be lengthened, and the cluster steel bar is gradually threaded downwards to the designed position after being lengthened.
And after the cluster steel bars 6 are installed, pouring or pouring the post-pouring slurry 8 into the reserved hole channels 4, maintaining, realizing the assembly construction of the whole prefabricated pier, and forming an integral structure. The post-pouring slurry can be high-pressure slurry 81, ultra-high performance concrete 82, self-compacting shrinkage-compensating concrete 83 and the like according to the size and the length of the reserved pore passage, and the pouring mode is bottom-to-top pouring or top-to-bottom pouring.
A construction method for prefabricating and assembling piers by adopting the full-length steel bar bundle connecting type segments comprises the following steps:
the method comprises the following steps: the method comprises the steps that a foundation 1 is cast in situ on site, a plurality of prefabricated pier body sections 2 and prefabricated top cap sections 3 are prefabricated in a prefabrication factory, hole channels 4 are reserved on the foundation 1, the prefabricated pier body sections 2 and the prefabricated top cap sections 3, the plane positions of the reserved hole channels 4 correspond to one another, the reserved hole channels 4 are formed by special metal corrugated pipes 41 or a chiseling and restraining ring type 42, a rough surface is chiseled on the periphery of each reserved hole channel when chiseling is about, the restraining rings are in a mode that spiral ribs are distributed on the periphery of each hole channel along the height direction of the whole hole channel, the effect of hooping is enhanced, when reinforcing steel bars inside the hole channels are stressed, the restraining ring spiral ribs form restraining hooping effect on the whole reserved hole channels, combination between post grouting materials and the prefabricated sections is facilitated, and; meanwhile, required bundled reinforcing steel bars 6 are processed.
Step two: transporting the prefabricated pier body sections 2, the prefabricated top cap sections 3, the bundled steel bars 6 and the like to a bridge site from a prefabrication factory through transportation equipment; the prefabricated pier body segment reserved hole channels correspond to the foundation reserved hole channels one by one, the bonding material is smeared, and the prefabricated pier body segment is installed; a plurality of prefabricated pier shaft segments 2 and prefabricated top cap segments 3 are sequentially installed in the same mode, and assembly of the foundation 1, the prefabricated pier shaft segments 2 and the prefabricated top cap segments 3 is completed.
The splicing modes of the prefabricated pier body segment, the foundation, the prefabricated pier body segment and the prefabricated top cap segment are as follows:
paving a joint bonding material 5 on the top surface of the foundation 1, wherein the joint bonding material 5 can be high-strength mortar or ultrahigh-performance concrete, the thickness is generally 2-3 cm, the connection between the foundation 1 and the prefabricated pier body section 2 is facilitated, and the function of adjusting the flatness is achieved; mounting a pore sealing ring 10 on the periphery of a reserved pore of the adjacent end surfaces of the foundation 1 and the prefabricated pier body section 2, hoisting the prefabricated pier body bottom section in place, and connecting the foundation 1 and the prefabricated pier body bottom section 2 by adopting a slurry setting method;
laying joint bonding material 5 on the lower section top surface of the prefabricated pier body, wherein the joint bonding material 5 adopts epoxy resin glue, the thickness is generally 2-3 mm, the epoxy resin glue connects the sections into a whole, and plays roles of water proofing, sealing and the like, and the durability of the joints is improved. Mounting a pore sealing ring 10 around a reserved pore of the adjacent end surface between the prefabricated pier body sections 2, sequentially mounting a plurality of pier body sections, and prepressing epoxy resin glue to realize the connection between the prefabricated pier body sections 2;
laying bonding material 5 at prefabricated pier shaft top surface, bonding material 5 adopts epoxy glue, and thickness is 2 ~ 3mm generally, and epoxy glue connects into whole between the festival section, and plays effects such as waterproof, sealed, increases the durability between the seam. And (3) mounting a pore sealing ring 10 around the reserved pore of the adjacent end surfaces of the prefabricated pier body segment 2 and the prefabricated top cap segment 3, mounting the prefabricated top cap segment 3, and prepressing epoxy resin glue to realize the connection between the prefabricated top cap segment 3 and the prefabricated pier body segment 2.
Step three: hoisting the bunched steel bars 6 one by one, penetrating the prefabricated top cap sections 3, the prefabricated pier body sections 2 and the reserved hole channels 4 of the foundation 1 from top to bottom from the top of the prefabricated top cap sections 3, and facilitating hoisting and installation due to certain rigidity of the bunched steel bars. When the pier is short, the vertical steel bars of the whole cluster steel bars 6 are whole steel bars without lengthening, and are temporarily fixed at the pier top after the penetration is finished; when the pier is high, the bunched steel bars 6 can be lengthened one by one, the steel bar lengthening 63 can be connected mechanically or welded, namely the bunched steel bars are temporarily fixed at the top of the pier after penetrating into the first section of bunched steel bars, then the bunched steel bars are lengthened with the second section of bunched steel bars, and the whole steel bars are penetrated downwards to the designed position after the lengthening is finished.
Step four: and pouring or pouring the post-pouring slurry 8 into the reserved hole channel 4, maintaining, and cutting off the grouting pipes of all the exposed parts of the structures.
As shown in fig. 4, the post-pouring slurry 8 can be poured or poured in three ways, and different materials and schemes can be flexibly selected according to actual construction conditions:
a. and reserving a grouting hole 9 at the bottom of the foundation 1 corresponding to the reserved hole 4, pouring the slurry into the whole reserved hole 4 from bottom to top through the reserved grouting hole 9, and finishing grouting when the slurry flows out from the top, wherein the slurry can adopt high-strength grouting 81.
b. The bottom of the foundation 1 is reserved with a grouting hole 9 corresponding to the reserved hole, slurry is poured into the reserved hole in the foundation from bottom to top through the reserved grouting hole 9, the grouting material can be ultra-high performance concrete 82, and the ultra-high performance concrete reduces the length of the reserved hole of the foundation and enhances the anchoring safety by utilizing the strong bond stress of the ultra-high performance concrete; similar to the setting method of the reserved grouting holes 9 at the foundation 1, a second row of grouting holes 9 are reserved in the corresponding reserved pore channels at the bottom section of the pier, slurry is poured into the rest reserved pore channels 4 from bottom to top through the reserved grouting holes 9, namely, secondary grouting is carried out, the secondary grouting can also play a role in strengthening the primary grouting, the compactness of the primary grouting is enhanced, the grouting is completed when the secondary grouting slurry flows out from the reserved pore channels at the top of the pier, and the secondary grouting slurry can adopt high-strength grouting slurry 81 so as to save the cost.
c. At 3 tops of prefabricated hood segments, adopt the mode of pouring, top-down concreting, wherein, the concrete can adopt self-compaction compensation shrink concrete 83, realizes self-compaction and exempts from the vibration, and the construction is simple and convenient.
Step five: and (5) grouting slurry after curing, forming an integral structure after reaching the strength, and completing construction of prefabricating and assembling the pier by adopting the full-length tied steel bar connection type segments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a pier is assembled in prefabrication of logical long steel bar connection formula section of gathering a bundle which characterized in that: including basis, prefabricated top cap festival section and a plurality of prefabricated pier shaft festival section all be provided with a plurality of preformed hole ways in basis, prefabricated pier shaft festival section and the prefabricated top cap festival section, basis, a plurality of prefabricated pier shaft festival section, prefabricated top cap festival section splice in proper order through seam bonding material, the preformed hole way one-to-one setting on basis, a plurality of prefabricated pier shaft festival sections and the prefabricated top cap festival section, each corresponds the setting run through respectively in the preformed hole and is provided with the reinforcing bar tied in a bundle, pour or pour the back to the preformed hole in again and pour the thick liquids.
2. The pier is assembled in prefabrication of full length steel bar tied in a bundle section of claim 1, characterized in that: and the periphery of a reserved hole channel of the adjacent end surfaces of the foundation and the prefabricated pier body sections, the adjacent end surfaces between the prefabricated pier body sections and the adjacent end surfaces of the prefabricated pier body sections and the prefabricated top cap sections is provided with a hole channel sealing ring, the hole channel sealing ring is a rubber pad, and the size and the shape of the hole channel sealing ring are matched with the reserved hole channel.
3. The pier is assembled in advance to full length steel bar tied in a bundle section prefabrication of claim 1 or 2, characterized in that: the steel reinforcement tied in a bundle is the steel reinforcement cage that comprises a plurality of main muscle and stirrup, fixes many main muscle through the stirrup, the steel reinforcement cage is circular or rectangle, and is unanimous with the preformed hole shape, at the non-preformed hole position of a plurality of prefabricated pier shaft sections and prefabricated hood sections, is provided with the section internal distribution reinforcing bar.
4. The pier is assembled in prefabrication of full length steel bar tied in a bundle section of claim 3, characterized in that: all be equipped with the shear force key on the adjacent terminal surface of prefabricated pier shaft festival section and prefabricated hood festival section and the adjacent terminal surface between prefabricated pier shaft festival section, adopt high strength mortar or ultra high performance concrete to connect between basis and prefabricated pier shaft festival section, adopt epoxy glue to connect between a plurality of prefabricated pier shaft festival sections, between prefabricated pier shaft festival section and the prefabricated hood festival.
5. The pier is assembled in prefabrication of full length steel bar tied in a bundle section of claim 1, characterized in that: the post-pouring slurry is high-strength pressure slurry, ultra-high performance concrete or self-compacting shrinkage-compensating concrete.
6. The pier is assembled in prefabrication of full length steel bar tied in a bundle section of claim 3, characterized in that: the reserved hole channel is formed by adopting a metal corrugated pipe or adopting a scabbling and restraining ring mode.
7. The pier is assembled in prefabrication of full length steel bar tied in a bundle section of claim 6, characterized in that: the roughening is to chisel rough surfaces around the reserved hole passage and arrange spiral rib-shaped restraining rings on the outer surface around the hole passage along the whole height direction.
8. A construction method for prefabricating and assembling piers by using the full-length tied steel bar connection type segments as claimed in claims 1 to 7, which is characterized in that the construction process is as follows:
the method comprises the following steps: on-site cast-in-place construction foundation, prefabricating a plurality of prefabricated pier body sections and prefabricated top cap sections in a prefabricating factory, reserving pore channels on the foundation, the plurality of prefabricated pier body sections and the prefabricated top cap sections, and simultaneously processing required bundling reinforcing steel bars;
step two: transporting the prefabricated pier body segment, the prefabricated top cap segment and the bundled steel bars to a bridge site from a prefabrication factory through transportation equipment; corresponding the preformed pier body segment preformed holes to the preformed holes between the foundations one by one, smearing bonding materials, and installing the preformed pier body segments; sequentially installing a plurality of prefabricated pier body sections and prefabricated top cap sections in the same manner to assemble the foundation, the prefabricated pier body sections and the prefabricated top cap sections;
step three: hoisting the bundling steel bars one by one, and penetrating the bundling steel bars into the prefabricated top cap sections, the prefabricated pier body sections and reserved channels of the foundation from top to bottom from the top of the prefabricated top cap sections; when the pier is short, the vertical steel bars of the whole cluster steel bars are whole steel bars without lengthening, and the vertical steel bars are temporarily fixed at the pier top after penetrating; when the pier is high, the bunched steel bars are lengthened one by one, the steel bars are lengthened by adopting mechanical connection or welding, namely, the bunched steel bars are temporarily fixed on the top of the pier after penetrating into the first section of bunched steel bars, then are lengthened with the second section of bunched steel bars, and the whole steel bars are penetrated to the designed position after the lengthening is finished;
step four: pouring or pouring the post-pouring slurry into the reserved hole channel, maintaining, and cutting off the grouting pipes of the exposed parts of all the structures;
step five: and (5) grouting slurry after curing, forming an integral structure after reaching the strength, and completing construction of prefabricating and assembling the pier by adopting the full-length tied steel bar connection type segments.
9. The construction method of the full-length tied steel bar connecting type segment prefabricated assembled pier according to claim 8, wherein the construction method comprises the following steps: the post-pouring slurry is poured or poured by adopting the following three modes:
a. reserving a grouting hole at the bottom of the foundation corresponding to the reserved hole channel, pouring the slurry into the whole reserved hole channel from bottom to top through the reserved grouting hole, and finishing grouting when the slurry flows out from the top;
b. reserving a grouting hole at the bottom of the foundation corresponding to the reserved hole channel, and pouring slurry into the reserved hole channel in the foundation from bottom to top through the reserved grouting hole; reserving a second row of grouting holes in the corresponding reserved pore channels of the bottom section of the pier, pouring slurry into the other reserved pore channels from bottom to top through the reserved grouting holes, namely performing secondary grouting, and finishing grouting when the secondary grouting slurry flows out of the reserved pore channels at the top of the pier;
c. and pouring concrete from top to bottom on the top of the prefabricated top cap segment in a pouring mode.
10. The construction method of the full-length tied steel bar connecting type segment prefabricated assembled pier according to claim 8, wherein the construction method comprises the following steps: in the second step, splicing modes of the prefabricated pier body segment and the foundation, between the prefabricated pier body segments and the prefabricated top cap segment are as follows:
laying a joint bonding material on the top surface of the foundation, wherein the joint bonding material is high-strength mortar or ultrahigh-performance concrete, mounting a pore sealing ring around a reserved pore on the adjacent end surfaces of the foundation and the prefabricated pier body section, hoisting the prefabricated pier body bottom section in place, and connecting the foundation and the prefabricated pier body bottom section by adopting a mortar setting method;
paving a bonding material on the top surface of the lower section of the prefabricated pier body, wherein the bonding material adopts epoxy resin glue, installing a pore sealing ring around a reserved pore of the adjacent end surface between the sections of the prefabricated pier body, sequentially installing a plurality of pier body sections according to the above method, and prepressing the epoxy resin glue to realize the connection between the prefabricated pier body sections;
laying bonding material on the top surface of the prefabricated pier body, wherein the bonding material adopts epoxy resin glue, mounting a pore sealing ring around a reserved pore of the adjacent end surfaces of the prefabricated pier body segment and the prefabricated top cap segment, mounting the prefabricated top cap segment, and prepressing the epoxy resin glue to realize the connection between the prefabricated top cap segment and the prefabricated pier body segment.
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| CN202010030384.7A CN113106847A (en) | 2020-01-10 | 2020-01-10 | Full-length tied-in-bundle steel bar connection type segment prefabricated assembled pier and construction method |
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| CN202010030384.7A CN113106847A (en) | 2020-01-10 | 2020-01-10 | Full-length tied-in-bundle steel bar connection type segment prefabricated assembled pier and construction method |
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