CN113481834A - Novel prefabricated assembled pier and construction method thereof - Google Patents
Novel prefabricated assembled pier and construction method thereof Download PDFInfo
- Publication number
- CN113481834A CN113481834A CN202110924639.9A CN202110924639A CN113481834A CN 113481834 A CN113481834 A CN 113481834A CN 202110924639 A CN202110924639 A CN 202110924639A CN 113481834 A CN113481834 A CN 113481834A
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- bearing platform
- pier
- pier body
- prefabricated
- connecting device
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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
Abstract
The invention provides a novel prefabricated assembled pier, which comprises: the upper surface of the bearing platform is provided with a groove, and a lower connecting device is arranged in the bearing platform; the prefabricated pier body comprises a pier body and an upper connecting device, the upper connecting device matched with the lower connecting device is installed in the pier body, the bottom of the pier body is provided with an anti-shearing device, and the prefabricated pier body further comprises a UHPC base grout layer which is used for fixedly connecting the pier body with a bearing platform and is matched with the anti-shearing device. A construction method of a novel prefabricated assembled pier comprises the following steps: s1: fixing the bearing platform on the bridge pile foundation or pouring the bearing platform in situ; s2: hoisting the prefabricated pier body on a bearing platform; s3: and fixing the prefabricated pier body on a bearing platform. The prefabricated pier body and the bearing platform are connected and fixed through the upper connecting device and the lower connecting device, the shearing resistance device is matched with the UHPC seat slurry layer to improve the shearing resistance of the joint of the prefabricated pier body and the bearing platform, the shearing resistance device replaces manual scabbling, manpower is saved, the pier is not damaged, and the installation efficiency is improved.
Description
Technical Field
The invention relates to the technical field of fixed connection of prefabricated parts, in particular to a novel prefabricated assembled pier and a construction method thereof.
Background
The traditional construction of bridge substructure in China mainly comprises manual binding and on-site pouring, while prefabricated assembly type construction is a great change of construction mode and is an important measure for promoting structural reform of supply side and construction of novel traffic infrastructure. The method is favorable for saving labor force, reducing construction pollution and improving engineering quality and construction efficiency, thereby developing green construction.
In the prior art, the traditional seat slurry layer is a shear-resistant weak layer, so that the seat slurry layer becomes the weakest link which is easy to ignore and is the weakest link in the whole assembly system; in the traditional seat slurry layer construction, the stress is large and the seat slurry layer is easy to crush, so that the seat slurry layer construction method becomes the biggest hidden danger of reducing the durability. The quality is not easy to control by knocking and chiseling the pier bottom, microcrack damage is easy to form in the concrete, and the integrity of the existing concrete is damaged. When the chiseling is performed, the bridge piers need to be placed on the ground upside down for chiseling, and the bridge piers need to be erected and stored after the chiseling of the pier bottoms is finished, so that a large amount of manpower is wasted, and a lifting appliance is occupied;
disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a novel prefabricated assembled pier and a construction method thereof, and the technical scheme of the invention is as follows:
the utility model provides a novel pier is assembled in prefabrication, includes: prefabricating a pier body and a bearing platform;
the upper surface of the bearing platform is provided with a groove, and a lower connecting device is arranged in the bearing platform;
prefabricated pier shaft includes pier shaft body and last connecting device, with lower connecting device matched with it installs to go up connecting device in the pier shaft body is internal, the bottom of pier shaft body is equipped with anti-shearing mechanism, still including being used for pier shaft body with cushion cap fixed connection, and with device matched with UHPC seat thick liquid layer shears.
This technical scheme, prefabricated pier shaft and cushion cap are connected fixedly through last connecting device and lower connecting device, the device that shears cooperatees with UHPC seat thick liquid layer and improves the anti-shear capacity of prefabricated pier shaft and cushion cap junction, anti-shear device replaces artifical chisel hair, use manpower sparingly, do not harm the pier, the no dead angle of omnirange shears, the efficiency of installation is improved, because do not carry out the chisel hair and keep away not haring the pier, the security performance and the life of prefabricated pier have been improved, the recess of cushion cap upper surface makes UHPC seat thick liquid layer do not need the template and do not have the template and leak out the stained cushion cap face problem of thick liquid when pouring.
On the basis of and as a preferred version of the above-mentioned solution; lower connecting device for set up in a plurality of spacing reinforcing bars in the cushion cap, spacing reinforcing bar equipartition in groove wall inboard, just spacing reinforcing bar has and stretches out the connecting portion of cushion cap upper surface, go up connecting device and include stabilizer bar and grout sleeve, grout sleeve embedded in pier shaft body lower surface, just grout sleeve with spacing reinforcing bar one-to-one, stabilizer bar set up in pier shaft is originally internal, stabilizer bar one end is located in the grout sleeve.
In the technical scheme, the specific scheme of the lower connecting device and the upper connecting device is that the UHPC seat slurry layer is connected with the grouting sleeve, and the UHPC seat slurry layer is different from the traditional UHPC seat slurry layer in that a template needs to be erected, slurry leakage exists to pollute the surface of a bearing platform, and damage caused by disassembling the template after the age period is avoided.
On the basis of and as a preferred version of the above-mentioned solution; the lower half part of the limiting reinforcing steel bar is provided with a bending part.
Among this technical scheme, the portion of bending of spacing reinforcing bar bottom can improve the tensile ability of prefabricated pier shaft.
On the basis of and as a preferred version of the above-mentioned solution; the bending direction of the bending part is a direction far away from the center of the bearing platform, and the bending angle of the bending part is 90 degrees.
In this technical scheme, a concrete form of portion of bending.
On the basis of and as a preferred version of the above-mentioned solution; the anti-shearing device is at least one of a wavy shear key and a corrugated groove steel template.
In the technical scheme, the specific structure of the anti-shearing device is used for being matched with the UHPC base slurry layer to form fixed connection, so that the anti-shearing capacity between the prefabricated pier body and the bearing platform is improved, the safety performance of the prefabricated pier is improved, and the service life of the prefabricated pier is further prolonged.
On the basis of and as a preferred version of the above-mentioned solution; the depth of the groove is not less than 20 cm.
In this technical scheme, the degree of depth of recess is adjusted according to the height of prefabricated pier shaft of reality, and the recess degree of depth is not less than 20cm and avoids being connected between prefabricated pier shaft and the cushion cap to go wrong.
On the basis of and as a preferred version of the above-mentioned solution; still including being used for adjusting prefabricated pier shaft with hang down straightness's a plurality of gaskets between the recess bottom, the gasket is located pier shaft bottom with between the recess bottom.
In this technical scheme, the gasket is arranged in adjusting the roughness of prefabricated pier shaft in the cushion cap recess for the prefabricated pier of assembling reaches the roughness that meets the requirements.
A construction method of a novel prefabricated assembled pier comprises the following steps:
step S1: fixing the bearing platform on the bridge pile foundation or pouring the bearing platform in situ;
step S2: hoisting the prefabricated pier body to the bearing platform;
step S3: and fixing the prefabricated pier body on the bearing platform.
Compared with the prior art, the invention has the following beneficial effects:
1. prefabricated pier shaft and cushion cap are connected fixedly through last connecting device and lower connecting device, the anti shearing device cooperatees with UHPC seat thick liquid layer and improves the anti shearing ability of prefabricated pier shaft and cushion cap junction, anti shearing device replaces artifical chisel hair, use manpower sparingly, do not harm the pier, the no dead angle of omnidirectional shears, the efficiency of installation is improved, because do not chisel hair and do not harm the pier, the security performance and the life of prefabricated pier have been improved, the recess of cushion cap upper surface makes UHPC seat thick liquid layer do not need the template and do not have the template and leak the stained cushion cap face problem of thick liquid when pouring.
2. The anti-shearing device is at least one of a wave-shaped shear key and a corrugated groove steel template and is used for being matched with the UHPC seat slurry layer to form fixed connection, so that the anti-shearing capacity between the prefabricated pier body and the bearing platform is improved, the safety performance of the prefabricated pier is improved, and the service life of the prefabricated pier is further prolonged.
3. The high-strength UHPC replaces the traditional base slurry layer, potential hazards possibly existing in the weakest link of a prefabricated assembly system are eliminated, and the overall reliability and safety of the assembly system are improved. The advantage of high compressive strength of UHPC can be fully played, the adverse effect of the traditional UHPC seat slurry layer on stress under the action of various adverse loads is effectively solved, and the original design of prefabrication and cast-in-place is really realized.
4. The depth of the groove is adjusted according to the height of the actual prefabricated pier body, and the depth of the groove is not less than 20cm, so that the problem of connection between the prefabricated pier body and the bearing platform is avoided.
5. The gasket is used for adjusting the roughness of prefabricated pier shaft in the cushion cap recess for the prefabricated pier of assembling reaches the roughness that meets the requirements, improves the precision of prefabricated concatenation pier.
6. The upper surface of the bearing platform is provided with the groove, so that when the bearing platform is connected with the prefabricated pier body, a UHPC base slurry layer is poured without a template, and the problem that the surface of the bearing platform is polluted by slurry leakage of the template does not exist.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of a connection structure provided by the present invention;
FIG. 2 is a schematic cross-sectional view A-A of FIG. 1 according to the present invention;
FIG. 3 is a schematic view of the slurry layer of the UHPC base slurry on the bearing platform of the present invention without casting slurry;
FIG. 4 is a schematic diagram of a UHPC seat slurry layer on a bearing platform after slurry is poured;
FIG. 5 is a schematic view of the process of splicing the preset pier body and the bearing platform;
FIG. 6 is a schematic diagram of the prefabricated pier body and the bearing platform of the present invention;
FIG. 7 is a schematic view of the present invention illustrating the completion of casting;
description of reference numerals: 11. a pier body; 121. stabilizing the reinforcing steel bar; 122. grouting a sleeve; 13. a shear resisting device; 2. a bearing platform; 21. a groove; 22. limiting the reinforcing steel bars; 221. a connecting portion; 222. a bending part; 23. a UHPC foundation slurry layer; 3. and (7) a gasket.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
For a better illustration of the invention, the invention is described in detail below with reference to the accompanying figures 1-7.
As shown in fig. 1, a schematic connection diagram of a prefabricated pier body and a bearing platform 2 is provided, the pier body 11 is located in a groove 21 on the upper surface of the bearing platform 2, a connection portion 221 of a limiting steel bar 22 reserved in the bearing platform 2 is located in a grouting sleeve 122 embedded in the pier body 11, a stabilizing steel bar 121 is arranged in the grouting sleeve 122, the bottom end of the stabilizing steel bar 121 extends into the grouting sleeve 122 and is used for limiting and maintaining the stability of the grouting sleeve 122, an anti-shearing device is arranged at the bottom of the prefabricated pier body, a gasket 3 is arranged between the prefabricated pier body and the bottom of the groove 21 of the bearing platform 2 and is used for adjusting the flatness of the prefabricated pier body, and a UHPC seat grout layer 23 is arranged at the bottom of the groove 21 and is used for being combined with the anti-shearing device to improve the shearing performance between the combined body of the prefabricated pier body and the bearing platform 2 and improve the safety performance of the prefabricated pier.
As shown in fig. 2, the cross-sectional grooves 21 of the pier body 11 in the cross-sectional view a-a in fig. 1 are matched in cross section, so that the prefabricated pier body can enter the grooves 21, the cross section of the grooves 21 is a regular quadrangle, the cross section of the pier body 11 is a regular quadrangle, the number of limiting steel bars 22 is twelve, and the limiting steel bars 22 are uniformly distributed inside the grooves 21.
As shown in fig. 3, the upper surface of the bearing platform 2 is provided with a groove 21, the bearing platform 2 is internally provided with a limiting steel bar 22, the limiting steel bar 22 is provided with a connecting part 221 which penetrates through the bottom of the groove 21 and protrudes out of the upper white surface of the bearing platform 2, the bottom of the limiting steel bar 22 is bent along the direction far away from the center of the bearing platform 2, an included angle between the bent part 222 and the vertical limiting steel bar 22 is 90 °, and the groove 21 is internally provided with a plurality of gaskets 3 for adjusting the flatness of the prefabricated pier body.
As shown in FIG. 4, UHPC concrete is poured into the UHPC grout layer 23 at the bottom of the groove 21 of the bearing platform 2.
As shown in fig. 5, during the splicing process of the prefabricated pier body and the bearing platform 2, the prefabricated pier body is located right above the bearing platform 2, and the grouting sleeve 122 moves downwards along the connecting part 221 of the limiting steel bar 22.
As shown in fig. 6, the prefabricated pier body and the bearing platform 2 are spliced, the anti-shearing device at the bottom of the pier body 11 is in contact with the UHPC base grout layer 23 in the groove 21 of the bearing platform 2 and extrudes the UHPC slurry in the UHPC base grout layer 23, so that the UHPC slurry fills the gap between the groove 21 and the anti-shearing device.
As shown in fig. 7, the prefabricated pier body and the bearing platform 2 are connected to complete the figure, when the UHPC grouting material in the groove 21 of the bearing platform 2 is initially set, the UHPC grouting material is poured into the grouting sleeve 122, and if the construction disturbance pressure is low, the grouting material reaches 35Mpa, and then the next procedure is performed; and if the construction disturbance pressure is high, the grouting material reaches 65Mpa, and then the next procedure is carried out. In this embodiment, the connecting portion 221 of the prefabricated pier body extends into the grouting sleeve 122 matched with the bearing platform 2, grouting material is injected into the grouting sleeve 122 reserved for the prefabricated pier body to anchor the reserved steel bar of the bearing platform 2, and the prefabricated pier body and the bearing platform 2 are connected into a whole after the high-strength grouting material is completely hardened.
Example one
As shown in fig. 1, a novel prefabricated spliced pier, including prefabricated pier shaft and cushion cap 2, cushion cap 2 upper surface is equipped with recess 21, be equipped with a plurality of spacing reinforcing bars 22 in the cushion cap 2, spacing reinforcing bar 22 evenly arrange with cushion cap 2 in, spacing reinforcing bar 22 has the spacing portion of wearing out recess 21 and stretching out cushion cap 2 upper surface, the bottom that is located spacing reinforcing bar 22 in cushion cap 2 has the portion of bending 222, specifically, as shown in fig. 2-3, spacing reinforcing bar 22 has twelve in this embodiment, evenly arrange in recess 21 bottom, it is square or circular etc. to need to explain the figure cross section that spacing reinforcing bar 22 encloses. The bending portion 222 bends along a direction away from the center of the bearing platform 2, and an angle between the bending portion and the vertical limiting rod is 90 °.
Referring to fig. 5-7, the prefabricated pier body includes a pier body 11, a wave-shaped shear key is arranged at the bottom of the pier body 11, grouting sleeves 122 are embedded in the lower surface of the pier body 11, the number of the grouting sleeves 122 is the same as that of the limiting steel bars 22, and the grouting sleeves 122 correspond to the limiting steel bars 22 one by one, when the prefabricated pier body is spliced with the bearing platform 2, the connecting portions 221 of the limiting steel bars 22 enter the corresponding grouting sleeves 122, twelve stabilizing steel bars 121 corresponding to the grouting sleeves 122 are arranged in the pier body 11, and the bottom end of each stabilizing steel bar 121 extends into the corresponding grouting sleeve 122. In other embodiments, the wave shear key is replaced by a corrugated groove 21 steel template, or a structure capable of forming a shear resistance with the UHPC seat slurry layer 23 is within the protection scope of the technical scheme of the invention.
Referring to fig. 4, a gasket 3 for leveling the prefabricated pier body is arranged in a groove 21 on the upper surface of the bearing platform 2, and a UHPC pedestal slurry layer 23 matched with a wavy shear key at the bottom of the prefabricated pier body is arranged in the groove 21. It should be noted that, in this embodiment, the UHPC mortar layer 23 is matched with the wave-shaped shear key, so as to increase the anchoring strength between the prefabricated pier body and the bearing platform 2, reduce the depth of the groove 21, and the length of the bottom of the pier body 11 extending into the groove 21, reduce the weight of the prefabricated pier, and improve the shear resistance of the prefabricated pier body. It should be noted that the depth of the groove 21 is not less than 20cm, and the depth of the shear key at the bottom of the pier body 11 entering the groove 21 is 6 mm. The depth of the groove 21 is adjusted according to the height of the actual prefabricated pier body, and the depth of the groove 21 is not less than 20cm, so that the problem of connection between the prefabricated pier body and the bearing platform 2 is avoided.
Prefabricated pier shaft and cushion cap 2 are connected fixedly through grout sleeve 122 and connecting portion 221 of spacing reinforcing bar 22, pier shaft body 11 wave shear force key cooperatees with UHPC seat thick liquid layer 23 and improves the anti-shear capacity of prefabricated pier shaft and cushion cap 2 junction, the artifical chisel hair is replaced to the wave shear force key, use manpower sparingly, do not harm the pier, the no dead angle of omnirange shears, the efficiency of installation is improved, because do not carry out the chisel hair and avoid not damaging the pier, the security performance and the life of prefabricated pier have been improved, the recess 21 of cushion cap 2 upper surface makes UHPC seat thick liquid layer 23 do not need the template and do not have the template and leak thick liquid stained cushion cap 2 face problem when pouring. Lower connecting device is for setting up a plurality of spacing reinforcing bars 22 in cushion cap 2, spacing reinforcing bar 22 equipartition is inboard in recess 21 wall, and spacing reinforcing bar 22 has the connecting portion 221 who stretches out cushion cap 2 upper surface, go up connecting device and include stabilizer bar 121 and grout sleeve 122, grout sleeve 122 is embedded in pier shaft body 11 lower surface, and grout sleeve 122 and spacing reinforcing bar 22 one-to-one, stabilizer bar 121 sets up in pier shaft body 11, stabilizer bar 121 one end is located grout sleeve 122. It is worth mentioning that in other embodiments, the fixed connection between the prefabricated pier body and the bearing platform 2 is realized by adopting a combined connection mode of the steel bars and the metal corrugated pipes, or the mechanism part for realizing the connection between the prefabricated pier body and the bearing platform 2 is within the protection scope of the invention.
Example two
A construction method of a novel prefabricated spliced pier comprises the following steps:
step S1: fixing the bearing platform 2 on the bridge pile foundation or pouring the bearing platform 2 in situ; as shown in fig. 3, in the present embodiment, the platform 2 is moved to the position of the bridge pile foundation by using a crane and is fixed, and it should be noted that in other embodiments, the platform 2 may be obtained by casting on the bridge pile foundation in situ.
Step S2: the prefabricated pier body is hung on the bearing platform 2; referring to fig. 5, the specific process of this embodiment is to hang the prefabricated pier body on the bearing platform 2, and set a spacer 3 on the bearing platform 2 to adjust the vertical connection between the prefabricated pier body and the bearing platform 2, and adjust the angle of the prefabricated pier body, so that the connection part 221 of the prefabricated pier body corresponds to the grouting sleeve 122 on the bearing platform 2, when the prefabricated pier body descends and is spliced with the bearing platform 2, the prefabricated pier body and the bearing platform 2 can be perfectly connected together, the bottom of the pier body 11 has a wave-shaped shear key, as shown in fig. 6, the prefabricated pier body is vertically embedded into the groove 21 of the bearing platform 2 and extrudes the UHPC grouting material in the UHOC seat grouting layer, and the UHPC grouting material fills the gap between the groove 21 of the bearing platform 2 and the embedded end of the lower part of the prefabricated pier body until the UHPC grouting material is extruded to the top surface of the bearing platform 2.
Step S3: and (4) fixing the prefabricated pier body on the bearing platform 2. Referring to fig. 7, after the UHPC grouting material in the groove 21 of the platform 2 is initially set, the UHPC grouting material is poured into the grouting sleeve 122, and if the construction disturbance pressure is low, the grouting material reaches 35Mpa, and then the next process is performed; and if the construction disturbance pressure is high, the grouting material reaches 65Mpa, and then the next procedure is carried out. In this embodiment, the connecting portion 221 of the prefabricated pier body extends into the grouting sleeve 122 matched with the bearing platform 2, grouting material is injected into the grouting sleeve 122 reserved for the prefabricated pier body to anchor the reserved steel bar of the bearing platform 2, and the prefabricated pier body and the bearing platform 2 are connected into a whole after the high-strength grouting material is completely hardened.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications within the scope of the claims and any combination of the embodiments described above may be made by those skilled in the art without affecting the essence of the present invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (8)
1. The utility model provides a novel pier is assembled in prefabrication, which characterized in that includes: prefabricating a pier body and a bearing platform;
the upper surface of the bearing platform is provided with a groove, and a lower connecting device is arranged in the bearing platform;
the prefabricated pier body comprises a pier body and an upper connecting device, the upper connecting device matched with the lower connecting device is arranged in the pier body, the bottom of the pier body is provided with an anti-shearing device,
the ultra-high performance concrete pier further comprises a UHPC seat grout layer which is used for fixedly connecting the pier body with the bearing platform and is matched with the shearing resisting device.
2. The novel prefabricated assembled pier according to claim 1, wherein the lower connecting device is a plurality of limiting steel bars arranged in the bearing platform, the limiting steel bars are uniformly distributed on the inner side of the groove wall, the limiting steel bars are provided with connecting parts extending out of the upper surface of the bearing platform, the upper connecting device comprises stabilizing steel bars and grouting sleeves, the grouting sleeves are embedded in the lower surface of the pier body, the grouting sleeves correspond to the limiting steel bars one to one, the stabilizing steel bars are arranged in the pier body, and one ends of the stabilizing steel bars are located in the grouting sleeves.
3. The novel prefabricated assembly pier of claim 2, wherein the lower half part of the limiting steel bar is provided with a bent part.
4. The novel prefabricated assembly pier of claim 3, wherein the bending direction of the bending portion is a direction away from the center of the bearing platform, and the bending angle of the bending portion is 90 °.
5. The novel prefabricated assembly pier according to any one of claims 1 to 4, wherein the anti-shearing device is at least one of a wavy shear key and a corrugated groove steel formwork.
6. The novel prefabricated assembly pier of claim 1, wherein the depth of the groove is not less than 20 cm.
7. The novel prefabricated assembled pier is characterized by further comprising a plurality of gaskets for adjusting the verticality between the prefabricated pier body and the bottom of the groove, wherein the gaskets are located between the pier body bottom and the bottom of the groove.
8. A construction method of a novel prefabricated assembled bridge pier is characterized by comprising the novel prefabricated assembled bridge pier as claimed in any one of claims 1 to 7, and the assembling method of the prefabricated assembled bridge pier comprises the following steps:
step S1: fixing the bearing platform on the bridge pile foundation or pouring the bearing platform in situ;
step S2: hoisting the prefabricated pier body to the bearing platform;
step S3: and fixing the prefabricated pier body on the bearing platform.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110924639.9A CN113481834A (en) | 2021-08-12 | 2021-08-12 | Novel prefabricated assembled pier and construction method thereof |
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| CN202110924639.9A CN113481834A (en) | 2021-08-12 | 2021-08-12 | Novel prefabricated assembled pier and construction method thereof |
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| CN114592423B (en) * | 2022-04-01 | 2024-01-30 | 中国十九冶集团有限公司 | Wet joint connection construction method for prefabricated pier column and bearing platform |
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Application publication date: 20211008 |