CN215857171U - Connecting structure of prefabricated assembled bridge pier - Google Patents
Connecting structure of prefabricated assembled bridge pier Download PDFInfo
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- CN215857171U CN215857171U CN202120092926.3U CN202120092926U CN215857171U CN 215857171 U CN215857171 U CN 215857171U CN 202120092926 U CN202120092926 U CN 202120092926U CN 215857171 U CN215857171 U CN 215857171U
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Abstract
The utility model discloses a connecting structure of a prefabricated assembly pier, wherein the upper end of the prefabricated assembly pier is provided with a tenon, the top surface of the upper tenon is contacted with the beam bottom of a bent cap, the prefabricated assembly pier is provided with embedded steel bars in a full length, vertical steel bars are called pier vertical steel bars, the vertical steel bars are arranged along the edge periphery of the prefabricated assembly pier and extend out to enclose the upper tenon, the bent cap is embedded with vertical steel bars called bent cap vertical steel bars, the vertical steel bars extend downwards between the exposed pier vertical steel bars, and the upper connecting structure is formed by pouring ultrahigh-performance concrete. The upper connecting structure can exert the performance of the ultra-high performance concrete; the ultra-high performance concrete has high strength and good adhesion performance with the reinforcing steel bars, can improve the bearing capacity of the structure, shorten the anchoring and lapping length of the reinforcing steel bars, reduce the size of a wet joint as small as possible and reduce the hoisting weight; the construction of the bridge is accelerated by utilizing the characteristics of quick hardening and early strength of the ultra-high performance concrete, and the construction period is shortened; the influence of the external adverse environment on the pier member is reduced by utilizing the characteristics of good impermeability, strong durability and the like of the high-performance concrete.
Description
Technical Field
The utility model relates to a connecting structure of a prefabricated assembled pier.
Background
The fully prefabricated bridge is a bridge which is formed by intensively prefabricating and assembling main components of upper and lower structures of a concrete bridge in a factory or a prefabricating field, and the work of erecting a mold, binding reinforcing steel bars, pouring concrete and the like in the field in bridge construction is transferred to a prefabricating factory by the technology, so that the bridge construction speed and construction quality can be improved, the interference to the surrounding environment and traffic interference can be reduced, and a good social effect can be formed; meanwhile, the number of workers can be greatly reduced, the quality of workers is improved, the construction quality is improved, the standardized management is favorably formed, and the development direction of construction enterprises is met.
The main advantages of the fully prefabricated assembled bridge are as follows: 1. machines and equipment are put into repeated use at one time, so that resources and cost are saved; 2. the degree of mechanization is high, the labor intensity is reduced, and the labor force is reduced; 3. the field construction period is shortened; 4. the pollution to the surrounding environment is reduced; 5. compared with the traditional construction mode, the water and electricity are saved by more than 30 percent; 6. the influence on traffic of a construction site is small; 7. the risk of accidents is reduced; 8. the construction quality is easy to ensure; 9. from a life cycle perspective, construction costs are reduced.
The existing connection modes of the pier assembled by using more prefabricated segments comprise post-tensioned prestressing connection, grouting sleeve connection, grouting metal corrugated pipes, socket joint type connection, UHPC wet joint connection and the like. These connection methods have advantages and disadvantages, such as the disadvantages of the post-tensioned prestressing connection method: firstly, energy-consuming steel bars are additionally arranged, and residual displacement is increased; secondly, the axial compression ratio is 10% -30%, the axial compression ratio is improved, the yield force is increased, and the ultimate bearing capacity is slightly increased; the prestress reinforcement ratio is 0.1-0.6%, the reinforcement ratio is improved, the yield force is increased, but the ultimate bearing capacity is increased slightly; the disadvantages of the grouting sleeve connection mode are that: the grouting sleeve has high precision requirement, the detection means is difficult, and the grouting sleeve cannot be maintained when in problem; the sleeve is pre-embedded in the pier stud, cracks in the range of the sleeve are few, the cracks are concentrated in the seam and the top area of the sleeve, and a second plastic hinge is possibly formed at the top of the sleeve; the sleeve is pre-buried at the cushion cap, for pre-buried at the pier stud, easily appears wholly sliding (shearing).
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a prefabricated spliced pier connecting structure which is convenient to construct, high in construction efficiency, capable of reducing precision requirements and improving connection reliability.
The purpose of the utility model is realized by the following technical scheme: the utility model provides a connection structure of pier is assembled in prefabrication, it includes that the prefabrication is assembled last connection structure of pier and bent cap and the lower connection structure of pier and cushion cap is assembled in prefabrication, its characterized in that, the prefabricated upper end of assembling the pier is the tenon, is called the tenon, go up the top surface of tenon with the beam bottom contact of bent cap, the prefabricated pier of assembling leads to long embedded steel bar, and the muscle that erects wherein is called pier and erects the muscle, and its edge the prefabricated edge periphery of assembling the pier sets up and stretches out to enclose and draw forth the tenon, the bent cap is pre-buried to have to erect the muscle and is called bent cap and erects the muscle, and it extends downwards to expose between the pier erects the muscle, constitutes through pouring super high performance concrete and goes up connection structure.
The upper connecting structure of the prefabricated assembled pier and the bent cap can play the performance of the ultra-high performance concrete; the ultra-high performance concrete has high strength and good adhesion performance with the reinforcing steel bars, can improve the bearing capacity of the structure, greatly shortens the anchoring and lapping length of the reinforcing steel bars, and simultaneously reduces the size of a wet joint as small as possible, thereby reducing the hoisting weight; the construction of the bridge is accelerated by utilizing the characteristics of quick hardening and early strength of the ultra-high performance concrete, and the construction period is shortened; the influence of the external adverse environment on the pier member is reduced by utilizing the characteristics of good impermeability, strong durability and the like of the high-performance concrete. The utility model is equal to the cast-in-place precision, greatly reduces the precision requirement, reduces the construction precision from 2mm of the traditional grouting sleeve to 20mm, greatly improves the construction applicability, ensures the connection reliability of the prefabricated splicing nodes, and greatly increases the applicability and the practicability of the prefabricated splicing in the engineering. Can be popularized and used in the construction of prefabricated assembled bridges so as to improve the construction speed.
The lower end of the prefabricated assembled pier is provided with a tenon which is called a lower tenon, an inclined surface is arranged between the root of the lower tenon and the column surface of the pier, the upper surface of the bearing platform is provided with a groove, the lower tenon extends into the groove and contacts with the groove bottom, a gap is formed between the lower tenon and the groove wall of the groove, vertical pier ribs of the prefabricated assembled pier extend downwards out of the inclined surface to the gap and enclose the lower tenon, vertical ribs which are called bearing platform vertical ribs are embedded in the bearing platform and distributed along the periphery, extend upwards from the groove bottom of the groove to the gap and are positioned between the vertical pier ribs, and ultrahigh-performance concrete is poured into the gap to form a lower connecting structure.
The lower connecting structure of the prefabricated assembled pier and the bearing platform has the advantages of an upper connecting structure, can avoid a plastic hinge area at the bottom of the pier, realizes the strain hardening characteristic of a material through higher fiber mixing amount, has the material advantages of high strength, high ductility and high durability, can obviously reduce the damage degree of the pier, exerts the performance of ultrahigh-performance concrete, shortens the anchoring length of a pier column and shortens the construction period. In addition, an inclined plane is arranged between the root of the lower tenon and the cylindrical surface of the pier, so that when the ultrahigh-performance concrete is poured later, the pouring compactness can be ensured.
The pier vertical ribs and the bent cap vertical ribs are uniformly distributed along the periphery respectively, and are mutually inserted between adjacent vertical ribs of the other side, so that a non-contact lap joint steel bar connection mode is adopted; the vertical ribs of the bearing platform are uniformly distributed along the periphery, and the vertical ribs of the pier and the vertical ribs of the bearing platform are mutually interpenetrated and inserted between adjacent vertical ribs of the other side, so that the bridge is in a non-contact lap joint steel bar connection mode.
The joint part of the inclined plane of the prefabricated assembled pier and the cylindrical surface of the pier is lower than the upper surface of the bearing platform or is flush with the upper surface of the bearing platform.
As a preferred embodiment of the present invention, the upper convex tenon of the prefabricated assembly pier is a block body tapered from bottom to top; the lower tenon of the prefabricated assembly pier is a block body which is gradually reduced from top to bottom. Specifically, the upper tenon and the lower tenon may be circular truncated cones, truncated pyramids, or the like.
An upper grout layer is arranged between the top surface of the upper tenon of the prefabricated assembly pier and the beam bottom of the bent cap. The upper slurry layer is used for error leveling and has the function of fine adjustment of precision.
According to the utility model, the groove bottom of the groove is provided with the positioning groove, the lower mortar layer is arranged in the positioning groove, and the lower tenon of the prefabricated assembled pier is positioned on the lower mortar layer. The constant head tank is used for the location, and the lower base thick liquid layer has error leveling, precision fine setting effect.
The precast assembled pier embedded steel bar comprises vertical bars, transverse bars, longitudinal bars and stirrups, wherein the transverse bars and the longitudinal bars are staggered to form a grid structure, the transverse bars and the longitudinal bars are connected with the vertical bars and the stirrups, the stirrups hoop the vertical bars, and the transverse bars and the longitudinal bars are densely distributed at two end parts of the precast assembled pier and sparsely distributed in the middle part of the precast assembled pier.
Compared with the prior art, the utility model has the following remarkable effects:
(1) the upper connecting structure of the prefabricated assembled pier and the capping beam and the lower connecting structure of the prefabricated assembled pier and the bearing platform can play the performance of the ultra-high performance concrete. The ultra-high performance concrete has high strength and good adhesion performance with the reinforcing steel bars, can improve the bearing capacity of the structure, greatly shortens the anchoring and lapping length of the reinforcing steel bars, and simultaneously reduces the size of a wet joint as small as possible, thereby reducing the hoisting weight; the bridge construction is accelerated by utilizing the characteristics of quick hardening and early strength of the high-performance concrete, and the construction period is shortened; the influence of the external adverse environment on the pier member is reduced by utilizing the characteristics of good impermeability, strong durability and the like of the high-performance concrete.
(2) The utility model is equal to the cast-in-place precision, greatly reduces the precision requirement, reduces the construction precision from 2mm of the traditional grouting sleeve to 20mm, greatly improves the construction applicability, ensures the connection reliability of the prefabricated splicing nodes, and greatly increases the applicability and the practicability of the prefabricated splicing in the engineering. Can be popularized and used in the construction of prefabricated assembled bridges so as to improve the construction speed.
(3) The lower connecting structure can avoid a plastic hinge area at the bottom of the pier, realizes the strain hardening characteristic of the material through higher fiber mixing amount, has the material advantages of high strength, high ductility and high durability, can obviously reduce the damage degree of the pier, exerts the performance of the ultra-high performance concrete, shortens the anchoring length of the pier column and shortens the construction period.
(4) The construction method is simple, the construction efficiency is high, the steel anchor ear, the temporary bracket and the UHPC post-cast template are integrated when the structure is connected under construction, a casting template is not required to be additionally arranged, the construction is convenient, the construction cost can be reduced, and the construction period is shortened.
Drawings
The utility model is described in further detail below with reference to the figures and the specific embodiments.
Fig. 1 is a schematic structural view of a prefabricated assembled pier of the present invention (vertical ribs exposed at the upper and lower ends are not shown);
FIG. 2 is a schematic diagram of reinforcement of the prefabricated pier assembly of the present invention;
FIG. 3 is a cross-sectional view taken along line I-I of FIG. 2;
FIG. 4 is a sectional view taken along line II-II of FIG. 2;
FIG. 5 is a schematic view of the overall structure and construction of the prefabricated assembled bridge of the present invention;
FIG. 6 is a front view of the reinforcement of the upper attachment structure of the present invention (showing all of the vertical ribs arranged along the perimeter);
FIG. 7 is a top view of the reinforcement of the upper attachment structure of the present invention;
figure 8 is a front view of the reinforcement of the lower attachment structure of the present invention (showing all of the vertical ribs arranged along the perimeter).
Detailed Description
As shown in fig. 1 to 8, the connecting structure of the prefabricated assembled pier comprises an upper connecting structure of the prefabricated assembled pier 1 and a capping beam 2 and a lower connecting structure of the prefabricated assembled pier 1 and a bearing platform 3.
Go up connection structure: the upper end of pier 1 is assembled in prefabrication is the tenon, be called tenon 11, the tenon is the round platform that is the convergent form from bottom to top, the top surface of tenon 11 contacts with the breast of bent cap 2, pier 1 leads to long embedded steel bar is assembled in prefabrication, vertical reinforcement wherein is called pier vertical reinforcement 4, it evenly sets up and stretches out along prefabrication the marginal periphery of assembling pier 1 and encloses tenon 11, bent cap 2 is pre-buried to have vertical reinforcement to call bent cap vertical reinforcement 5, it extends downwards between the pier vertical reinforcement 4 that exposes, alternate between the adjacent vertical reinforcement of other side each other promptly, for non-contact lapped steel bar connection mode, the rethread supports the template at this position and pours ultra high performance concrete 6 and constitutes connection structure. Referring to fig. 6, an upper grout layer 7 is arranged between the top surface of the upper convex tenon 11 and the beam bottom of the cover beam 2 for error leveling and has a precision fine adjustment function. The upper bedding slurry layer is made of high-strength mortar and is constructed by adopting a bedding slurry method.
The following connection structure: the lower end of the prefabricated assembly pier 1 is a tenon which is called as a lower tenon 12, the lower tenon 12 is a circular table which is gradually reduced from top to bottom, the root of the lower tenon 12 extends into an inclined plane 8 along the radial direction, the upper surface of the bearing platform 3 is provided with a groove 9, the lower tenon 12 extends into the groove 9 to be contacted with the groove bottom, the joint part of the inclined plane 8 and the cylindrical surface of the pier is lower than the upper surface of the bearing platform 3 or is flush with the upper surface of the bearing platform 3, a gap is arranged between the lower tenon 12 and the groove wall of the groove 9, the pier vertical ribs 4 of the prefabricated assembly pier extend downwards out of the inclined plane 8 to the gap and enclose the lower tenon 12, the bearing platform 3 is embedded with vertical ribs which are called as bearing platform vertical ribs 10 which are uniformly distributed along the periphery and extend upwards from the groove bottom of the groove 9 to the gap and are positioned between the pier vertical ribs 4, namely, the pier vertical ribs 4 and the bearing platform vertical ribs 10 are mutually inserted between adjacent vertical ribs, and are in a non-contact lapped reinforcing steel bar connection mode, and then pouring ultra-high performance concrete 6 into the gap to form a lower connecting structure. Referring to fig. 8, a positioning groove 13 is arranged at the bottom of the groove 9, a lower grout layer 14 is arranged in the positioning groove 13, and a lower tenon 12 of the prefabricated assembly pier 1 is positioned on the lower grout layer 14. The locating slot is used for locating, the lower mortar layer has the functions of error leveling and precision fine adjustment, the lower mortar layer is made of high-strength mortar, and the mortar layer is constructed by a mortar sitting method.
As shown in fig. 2-4, the precast pier embedded steel bars include vertical bars 4, horizontal bars 15, longitudinal bars 16 and stirrups 17, the horizontal bars 15 and the longitudinal bars 16 are staggered with each other to form a grid structure, the horizontal bars 15 and the longitudinal bars 16 are connected with the vertical bars 4 and the stirrups 17, the stirrups 17 are hooped by the stirrups 4, the horizontal bars 15 and the longitudinal bars 16 are densely distributed at two ends of the precast pier 1, and are sparsely distributed at the middle part.
In other embodiments, the upper tenon and the lower tenon can also be ledges, and the upper tenon can also be other blocks which are tapered from bottom to top; the lower tenon can also be other block bodies which are tapered from top to bottom.
As shown in fig. 4, a construction method of the prefabricated pier connection structure comprises the following steps:
s1, cleaning the groove 9 of the bearing platform 3 and the positioning groove 13 in the groove;
s2, vertically placing the prefabricated assembled pier 1 on a bearing platform 3, wherein the lower tenon 12 is positioned in the groove 9, the lower end face of the lower tenon 12 is positioned in the positioning groove 13, and the pier vertical ribs 4 and the bearing platform vertical ribs 10 are mutually inserted between adjacent vertical ribs of the other side;
s3, installing a jack 18, a steel anchor ear 19 and a temporary steel corbel 20 beside a groove 9, wherein the steel anchor ear 19 mainly comprises a cylinder body used for being hooped on the prefabricated assembly pier 1 and a steel plate covering a notch of the groove 9, the steel plate is connected to a cylinder opening at the lower end of the cylinder body, the steel plate is used as a template for post-pouring ultrahigh-performance concrete, a pouring hole is formed in the steel plate, the jack 18 is located outside the steel plate, the temporary steel corbel 20 is connected with the cylinder body of the steel anchor ear 19, and the jack 18 props up the temporary steel corbel 20;
s4, primarily adjusting the elevation and the inclination of the prefabricated assembly pier 1 by adjusting the jack 18;
s5, hoisting the prefabricated assembled pier 1, so that the steel anchor ear 19 and the temporary steel corbel 20 are hoisted together;
s6, pouring a lower grout layer 14 in the positioning groove 13 for leveling;
s7, lowering the prefabricated assembled pier 1 again, inserting the pier vertical ribs 4 and the bearing platform vertical ribs 10 between adjacent vertical ribs of the other side, covering the steel plates of the steel anchor ear 19 on the notch of the groove 9, pressing the temporary steel corbels 20 on the jack 18, and positioning the lower end face of the prefabricated assembled pier 1 on the lower mortar bed layer 14;
s8, pouring the ultra-high performance concrete 6 from the pouring hole, and curing to complete the construction of the lower connecting structure;
s9, arranging a jack 18, a steel anchor ear 19 and a temporary steel corbel 20 at the upper end of the prefabricated assembly pier 1, wherein the steel anchor ear 19 is cylindrical, the temporary steel corbel 20 is connected with the steel anchor ear 19, the jack 18 is positioned on the temporary steel corbel 20, the upper end of the steel anchor ear 19 is clamped with an annular rubber pressing strip 22, and the jack 18 is adjusted to a designed elevation;
s10, placing steel gaskets (not shown in the figure) on the pier tops of the prefabricated assembled piers 1, placing the bent caps 2, and inserting the pier vertical ribs 4 and the bent cap vertical ribs 5 between the adjacent vertical ribs of each other; the end part of the upper tenon 11 is positioned in a guide groove (not shown in the figure) on the lower surface of the bent cap 2, and a steel gasket is positioned between the upper tenon 11 and the bottom of the guide groove, so that a jack 18 is adjusted to adjust the elevation and the levelness of the bent cap 2;
s11, hoisting the bent cap 2, taking away the steel gasket, and pouring an upper grout layer 7 with the same thickness as the steel gasket on the pier top of the prefabricated assembly pier 1;
s12, lowering the bent cap 2 again, enabling the upper grout blanket 7 to be located in the guide groove, enabling the pier vertical ribs 4 and the bent cap vertical ribs 5 to be mutually inserted between adjacent vertical ribs of the other side, pouring the ultra-high performance concrete 6, maintaining and completing construction of the upper connecting structure.
The embodiments of the present invention are not limited thereto, and according to the above-mentioned contents of the present invention, the present invention can be modified, substituted or changed in other various forms without departing from the basic technical idea of the present invention.
Claims (9)
1. The utility model provides a connection structure of pier is assembled in prefabrication, it includes that the prefabrication is assembled last connection structure of pier and bent cap and the lower connection structure of pier and cushion cap is assembled in prefabrication, its characterized in that: the prefabricated upper end of assembling the pier is the tenon, is called the tenon, go up the top surface of tenon with the beam bottom contact of bent cap, the prefabricated pier of assembling leads to long embedded steel bar, and the muscle of erectting wherein is called pier and erects the muscle, and it is followed the prefabricated marginal periphery of assembling the pier sets up and stretches out and surround the tenon, the bent cap is pre-buried to have to erect the muscle and is called bent cap and erect the muscle, and it extends down between the pier and erects the muscle, constitutes connection structure through pouring super high performance concrete.
2. The connecting structure of a prefabricated pier assembly according to claim 1, wherein: the lower extreme of pier is assembled in the prefabrication is the tenon, is called down the tenon, is the inclined plane between the root of this lower tenon and the pier cylinder set up the recess on the upper surface of cushion cap, down the tenon stretch into in the recess with the tank bottom contact, the space has down between the cell wall of tenon and recess, the prefabricated pier of assembling the pier erects the muscle stretch out the inclined plane downwards extremely in the space and enclose down the tenon, the cushion cap is pre-buried to have to erect the muscle and is called cushion cap and erects the muscle, and it upwards stretches out to from the tank bottom of recess along peripheral distribution in the space and be located between the pier erects the muscle, constitutes down connection structure through pouring ultra-high performance concrete to the space.
3. The connecting structure of a prefabricated pier assembly according to claim 2, wherein: the pier vertical ribs and the bent cap vertical ribs are uniformly distributed along the periphery respectively, and are mutually inserted between adjacent vertical ribs of the other side, so that a non-contact lap joint steel bar connection mode is adopted; the vertical ribs of the bearing platform are uniformly distributed along the periphery, and the vertical ribs of the pier and the vertical ribs of the bearing platform are mutually interpenetrated and inserted between adjacent vertical ribs of the other side, so that the bridge is in a non-contact lap joint steel bar connection mode.
4. The connecting structure of a prefabricated pier assembly according to claim 3, wherein: the joint part of the inclined plane of the prefabricated assembled pier and the column surface of the pier is lower than the upper surface of the bearing platform or is flush with the upper surface of the bearing platform.
5. The connecting structure of a prefabricated pier assembly according to claim 4, wherein: the upper convex tenon of the prefabricated assembly pier is a tapered block from bottom to top; the lower tenon of the prefabricated assembly pier is a block body which is gradually reduced from top to bottom.
6. The connecting structure of a prefabricated pier assembly according to claim 5, wherein: and an upper grout layer is arranged between the top surface of the upper tenon of the prefabricated assembly pier and the beam bottom of the bent cap.
7. The connecting structure of a prefabricated pier assembly according to claim 6, wherein: the bottom of the groove is provided with a positioning groove, a lower pulp layer is arranged in the positioning groove, and the lower tenon of the prefabricated assembled pier is positioned on the lower pulp layer.
8. The connecting structure of a prefabricated pier assembly according to claim 7, wherein: the precast pier embedded steel bar is assembled including erecting muscle, horizontal muscle, indulging muscle and stirrup, horizontal muscle with indulge the mutual crisscross constitution grid structure of muscle, horizontal muscle with indulge the muscle and erect muscle, stirrup and link to each other, the stirrup staple bolt erects the muscle, horizontal muscle is in with indulging the muscle the both ends of pier are densely distributed in the prefabrication, and are sparse distribution at the middle part.
9. The connecting structure of a prefabricated pier assembly according to claim 8, wherein: the upper tenon and the lower tenon are round tables or prismatic tables.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120092926.3U CN215857171U (en) | 2021-01-13 | 2021-01-13 | Connecting structure of prefabricated assembled bridge pier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120092926.3U CN215857171U (en) | 2021-01-13 | 2021-01-13 | Connecting structure of prefabricated assembled bridge pier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116377862A (en) * | 2023-02-14 | 2023-07-04 | 保利长大工程有限公司 | Joint construction of prefabricated component pier column, bearing platform and capping beam and testing method thereof |
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2021
- 2021-01-13 CN CN202120092926.3U patent/CN215857171U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116377862A (en) * | 2023-02-14 | 2023-07-04 | 保利长大工程有限公司 | Joint construction of prefabricated component pier column, bearing platform and capping beam and testing method thereof |
| CN116377862B (en) * | 2023-02-14 | 2024-03-29 | 保利长大工程有限公司 | Seam test method for prefabricated component pier column, bearing platform and capping beam |
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