CN114775412A - Prefabricated segmental pier and construction method thereof - Google Patents
Prefabricated segmental pier and construction method thereof Download PDFInfo
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- CN114775412A CN114775412A CN202210493322.9A CN202210493322A CN114775412A CN 114775412 A CN114775412 A CN 114775412A CN 202210493322 A CN202210493322 A CN 202210493322A CN 114775412 A CN114775412 A CN 114775412A
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- 238000010276 construction Methods 0.000 title claims abstract description 12
- 210000002435 tendon Anatomy 0.000 claims abstract description 46
- 239000004567 concrete Substances 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 239000011148 porous material Substances 0.000 claims abstract description 12
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 15
- 230000006835 compression Effects 0.000 abstract description 12
- 238000007906 compression Methods 0.000 abstract description 12
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 238000005452 bending Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011376 self-consolidating concrete Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
Abstract
The invention belongs to the technical field of bridge structures, and particularly discloses a prefabricated segmental pier and a construction method thereof; wherein prefabricated segmental type pier includes: the device comprises a bearing platform, a prefabricated square pier body and four prestressed tendons; the top surface of the prefabricated square pier body is provided with a first prestressed anchorage device, and the prefabricated square pier body is provided with four prestressed ducts; the bottom end of the prefabricated pier body is provided with a pier bottom section; four break angles of the pier bottom section are provided with vertically arranged concrete filled steel tubes, and the prestressed pore channels penetrate through the concrete filled steel tubes. The vertically arranged steel tube concrete is arranged at the four corners of the pier bottom section to improve the energy consumption capability of the section edge of the pier bottom section, so that under earthquake disasters, the compression resistance and ductility of a compression area of the pier bottom section can be increased by using the steel tube concrete, and the integral earthquake-resistant extension effect of the pier bottom section is improved; the first prestressed anchorage device is anchored with the bearing platform through four eccentrically arranged prestressed tendons, and compared with the existing pier with the same height, the first prestressed anchorage device has better tensile and compressive effects and improves the self-resetting capability of the prestressed pier body.
Description
Technical Field
The invention relates to the technical field of bridge structures, in particular to a prefabricated segmental pier and a construction method thereof.
Background
In a highway bridge, a self-resetting system connected by prestressed steel strands, namely a non-equal cast-in-place system, is often adopted, and the main advantages of the system are that under the action of an earthquake, the damage accumulation of concrete in a tension area can be reduced through the opening and closing of joint seams of the system, the self-resetting capability of an initial position is recovered through post-tensioning prestress, but the problems of weak energy consumption capability, insufficient ductility and the like exist at the same time. In order to solve the problems of poor energy dissipation characteristics and poor ductility of a self-resetting pier system, concrete-filled steel tubes are placed in the center of an existing pier, and prestressed tendons are distributed on the periphery of the concrete-filled steel tubes, so that the energy consumption capacity of the bottom of the pier is improved, and the ductility of the pier is improved. However, under unexpected disaster conditions, the pier members are mainly pulled and pressed at the edges of the cross sections, and the anti-seismic extension effect of the prestressed tendons and the steel pipe concrete at the center cannot be effectively exerted.
Disclosure of Invention
The purpose of the invention is: the utility model provides a prefabricated segment type pier to solve among the prior art unable effective performance prestressing tendons and steel pipe concrete's antidetonation extension effect, lead to the lower technical problem of bottom power consumption ability, pier ductility.
In order to achieve the above object, a first aspect of the present invention provides a prefabricated segment type pier, comprising: the device comprises a bearing platform, a precast square pier body arranged on the bearing platform and four prestressed tendons; the center of the top surface of the prefabricated square pier body is provided with a first prestressed anchorage device, the prefabricated square pier body is provided with four prestressed ducts, the upper ends of the four prestressed ducts face the first prestressed anchorage device, and the lower ends of the four prestressed ducts are respectively positioned at four corners of the square bottom surface of the prefabricated square pier body; the bottom end of the prefabricated square pier body is provided with a pier bottom section; the four corners of the pier bottom section are provided with vertically arranged concrete-filled steel tubes, and the prestressed pore channels penetrate through the concrete-filled steel tubes; each prestressed tendon correspondingly penetrates through one prestressed duct, and the first prestressed anchorage device is connected with the bearing platform through four prestressed tendons.
Preferably, the outer side surface of the pier bottom section is provided with a support seat, and the support seat is positioned at the lower part of the pier bottom section.
Preferably, the supporting seat is square, the cushion cap is provided with and is used for holding the square holding tank of supporting seat, four sides of supporting seat and four cell walls of square holding tank all are provided with a plurality of shear studs.
Preferably, the prefabricated pier body has a multi-segment pier segment; the multistage pier body section from up piling up in proper order down on the pier bottom section, the multistage is worn to locate by the prestressing force pore canal in the pier body section.
Preferably, two adjacent pier segments are connected through a first concave-convex shear key.
Preferably, there is an adhesive between the contact faces of two adjacent pier segments.
Preferably, the lowermost pier body section is connected with the pier bottom section through a second concave-convex shear key.
Preferably, the top of the precasting pier body is provided with a groove for accommodating the first prestressed anchorage device.
Preferably, four second prestressed anchorage devices are arranged at the bottom of the bearing platform, and each second prestressed anchorage device is connected with one prestressed tendon.
The second aspect of the present invention provides a construction method for a prefabricated segment type bridge pier, which includes:
preparing a pier bottom section and a multi-section pier body section according to the height of a prefabricated pier body; when the pier bottom section is cast and formed, circular steel tubes and prestressed pipelines are embedded at four corners of a square reinforcement cage to form the pier bottom section with the prestressed pipelines and concrete-filled steel tubes; pre-burying a prestressed pipeline when pouring and forming the pier body section;
reserving a second prestressed anchorage device at the bottom of the bearing platform base, extending prestressed ribs with enough length from the second prestressed anchorage device, then performing anchoring and fixing, and pouring concrete of the bearing platform;
moving the pier bottom section to the installation position of the bearing platform, enabling the prestressed tendons to penetrate through the pre-embedded prestressed pipeline, and adopting concrete to tightly fill and seal the joint of the pier bottom section and the bearing platform; stacking the multiple pier bottom sections on the pier bottom sections one by one from bottom to top to form a prefabricated pier body; when the pier bottom sections are stacked, the prestressed tendons need to penetrate into the pre-buried prestressed pipelines;
and after the prefabricated square pier bodies are stacked and assembled, mounting a first prestressed anchorage device at the top of each prefabricated square pier body, enabling the four prestressed tendons to penetrate through the first prestressed anchorage devices, tensioning the prestressed tendons, and completing construction operation.
The invention provides a prefabricated segment type bridge pier and a construction method thereof, which have the beneficial effects that: the prefabricated square pier body of the prefabricated segmental pier is provided with a pier bottom section, and the four corners of the pier bottom section are respectively provided with vertically arranged steel pipe concrete so as to improve the energy consumption capacity of the section edge of the pier bottom section, so that under earthquake disasters, the compression resistance and ductility of a compression area of the pier bottom section can be increased by using the steel pipe concrete, the bending ductility of a tension side can be increased, the integral earthquake-resistant extension effect of the pier bottom section is improved, and the action of the steel pipe concrete is fully exerted; and the first prestressed anchorage device at the top of the prefabricated square pier body is anchored with the bearing platform through four eccentrically arranged prestressed tendons, compared with the existing pier with the same height, the prestressed tendons are longer in tension arm and pressure arm and better in tension and pressure resistance effects, so that the self-resetting capability of the prefabricated square pier body is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a prefabricated segmented pier according to an embodiment of the first aspect of the embodiment of the invention;
fig. 2 is a schematic structural view of an pier segment of a prefabricated segmented pier according to an embodiment of the first aspect of the present invention;
fig. 3 is a schematic structural view of a pier bottom section of a prefabricated segmented pier according to an embodiment of the first aspect of the embodiment of the invention;
fig. 4 is a schematic cross-sectional view of a pier bottom section of the prefabricated segmented pier of the embodiment of the first aspect.
In the figure, 1, a square pier body is prefabricated; 11. a pier bottom section; 12. a supporting base; 13. pier segment; 14. a groove; 2. a bearing platform; 21. a square accommodating groove; 3. prestressed tendons; 4. a first concave-convex shear key; 41. a second concave-convex shear key; 5. a first pre-stressed anchorage; 6. shear resistant studs; 7. concrete-filled steel tubes; 8. a pre-stressed duct; 9. and a second pre-stressed anchor.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 4 together, a prefabricated segment pier according to an embodiment of the present invention will now be described.
Referring to fig. 1 to 4, a prefabricated segmental pier according to an embodiment of the present invention includes: the device comprises a bearing platform 2, a precast square pier body 1 arranged on the bearing platform 2 and four prestressed tendons 3; the center of the top surface of the prefabricated square pier body 1 is provided with a first prestressed anchorage device 5, the prefabricated square pier body 1 is provided with four prestressed ducts 8 of which the upper ends face the first prestressed anchorage device 5, and the lower ends of the four prestressed ducts 8 are respectively positioned at four corners of the square bottom surface of the prefabricated square pier body 1; the bottom end of the prefabricated pier body 1 is provided with a pier bottom section 11; the four corners of the pier bottom section 11 are provided with vertically arranged concrete filled steel tubes 7, and the prestressed pore passages 8 penetrate through the concrete filled steel tubes 7; each prestressed tendon 3 correspondingly passes through one prestressed duct 8, and the first prestressed anchor device 5 is connected with the bearing platform 2 through four prestressed tendons 3.
The prefabricated square pier body 1 is in a square column shape, the upper ends of four prestressed ducts 8 are converged at the first prestressed anchorage device 5 at the top of the prefabricated square pier body 1 and extend in a divergent shape towards four folding angles of the bottom surface of the pier bottom section 11, so that the prestressed ducts 8 at the pier bottom section 11 can be positioned in the concrete-filled steel tube 7. Concrete filled steel tube 7 is formed by filling concrete into the round steel tube of pier bottom section 11 to improve the energy consumption ability of the section edge of pier bottom section 11, improve the holistic antidetonation of pier bottom section 11 and extend the effect, in order to give full play to concrete filled steel tube 7's effect. Compared with the existing pier with the same height, the prestressed reinforcement 3 has longer tension arm and pressure arm and better tension and pressure resisting effect so as to improve the self-resetting capability of the prefabricated pier body 1.
It should be noted that, after the four prestressed tendons 3 are matched with the first prestressed anchorage device 5 to anchor and tension, the prestressed tendons 3 can be regarded as the lateral edges of the rectangular pyramid. Two adjacent prestressed tendons 3 cooperate with the cushion cap 2 to form a triangle, and compared with a square compression-resistant and tension-resistant frame, the compression-resistant and tension-resistant frame of the triangle has better compression resistance and pressure resistance, so that the self-resetting capability and the shock resistance of the prefabricated pier body 1 are improved.
The prefabricated square pier body 1 of the prefabricated segmental pier of the embodiment is provided with a pier bottom section 11, and the vertically arranged steel pipe concrete 7 is arranged at four corners of the pier bottom section 11 so as to improve the energy consumption capability of the section edge of the pier bottom section 11, so that under earthquake disasters, the compression resistance and ductility of a compression area of the pier bottom section 11 can be increased by using the steel pipe concrete 7, the bending ductility of a tension side can be increased, the integral earthquake-resistant extension effect of the pier bottom section 11 is improved, and the effect of the steel pipe concrete 7 is fully exerted; and the first prestressed anchorage device 5 at the top of the prefabricated square pier body 1 is anchored with the bearing platform 2 through four eccentrically arranged prestressed tendons 3, compared with the existing pier with the same height, the prestressed tendons 3 are longer in tension arm and compression arm, better in tension and compression effect, and capable of improving the self-resetting capacity of the prefabricated square pier body 1.
In the preferred embodiment of the present invention, referring to fig. 1 and 3, the outer side of the bottom block section 11 is provided with a support seat 12, and the support seat 12 is located at the lower portion of the bottom block section 11. Supporting seat 12 and pier bottom section 11 integrated into one piece, through setting up supporting seat 12, increase pier bottom section 11 and cushion cap 2's area of contact improves pier bottom section 11 and cushion cap 2's joint strength, prevents that the square pier body 1 in advance from collapsing.
In a preferred embodiment of the present invention, referring to fig. 1, the support seat 12 is square, the platform 2 is provided with a square-shaped receiving groove 21 for receiving the support seat 12, and four side surfaces of the support seat 12 and four groove walls of the square-shaped receiving groove 21 are provided with a plurality of shear pins 6. The gap between the square accommodating groove 21 of the supporting seat 12 and the bearing platform 2 can be filled with non-shrinkage self-compacting concrete to be compact, so that the bearing platform 2 and the pier bottom section 11 are more stably connected, the shearing resistance of the pier under extreme disaster conditions is improved, and the pier bottom section 11 can be prevented from turning on one side when stressed by combining the prestressed ribs 3, so that the pier and the bearing platform 2 form a whole with resistance.
In a preferred embodiment of the invention, referring to fig. 1, a prefabricated square pier body 1 has a multi-segment pier segment 13; the multi-section pier body section 13 is stacked on the pier bottom section 11 from bottom to top in sequence, and the prestress pore channel 8 is arranged in the multi-section pier body section 13 in a penetrating mode. Namely, the prefabricated square pier body 1 is formed by assembling a pier bottom section 11 and a plurality of pier body sections 13, wherein the prestressed pore passages 8 penetrate through the pier body sections 13 so that the prestressed tendons 3 penetrate through the prestressed pore passages. By arranging the multi-segment pier segment 13, the large prefabricated pier body 1 can be conveniently divided into a plurality of small pier segments 13, so that the transportation and the assembly are convenient. The prestressed duct 8 is a polyvinyl chloride pipe or other plastic pipe commonly used in the market, and can be pre-embedded in the pier body section 13 or the pier bottom section 11 to form the prestressed duct 8.
In a preferred embodiment of the invention, and with reference to figure 1, two adjacent pier segments 13 are connected by a first male and female shear key 4. The contact surface of two adjacent pier body sections 13 is provided with a first concave-convex shear key 4 which are matched with each other to facilitate positioning assembly and installation, so that the section friction force is improved, and the shear resistance of the whole prefabricated pier body 1 is improved.
In the preferred embodiment of the invention, there is an adhesive between the contact faces of two adjacent pier segments 13. Namely, the adhesive is coated on the first concave-convex shear key 4 of the two adjacent pier body sections 13 to improve the cohesive force and the section friction force, and the shear resistance of the prefabricated pier body 1 is greatly improved. It should be mentioned that the adhesive is an epoxy resin adhesive, which has more reliable bonding performance and good shearing resistance. In addition, other adhesives may be used.
In a preferred embodiment of the invention, referring to fig. 1, the lowermost pier segment 13 is connected to the pier bottom segment 11 by a second male and female shear key 41. The shape of the second concave-convex shear key 41 is the same as that of the first concave-convex shear key 4, so that the pier body section 13 can be conveniently selected to be connected with the pier bottom section 11, and the contact surface of the second concave-convex shear key 41 between the pier body section 13 and the pier bottom section 11 is bonded by epoxy resin glue.
In a preferred embodiment of the invention, referring to fig. 1, the top of the prefabricated pier body 1 is provided with a groove 14 for receiving the first pre-stressed anchor 5. The groove 14 can prevent the first prestressed anchorage device 5 from being separated from the top surface of the prefabricated square pier body 1, and tension failure is avoided. Through the arrangement of the groove 14, the first prestressed anchorage device 5 can be conveniently and quickly positioned and conveniently tensioned.
In a preferred embodiment of the invention, with reference to fig. 1, the bottom of the platform 2 is provided with four second pre-stressed anchors 9, each second pre-stressed anchor 9 being connected to one tendon 3. The second prestressed anchorage device 9 is located below the lower end of the prestressed duct 8 and is arranged at the bottom of the bearing platform 2 to anchor the prestressed tendon 3 better. It should be noted that the tendon 3 is a steel strand so as to facilitate the tendon 3 to pass through the prestressed duct 8, and facilitate the first prestressed anchorage 5 to anchor the upper end of the tendon 3.
The invention also provides a construction method of the prefabricated segment type bridge pier, which comprises the following steps,
preparing a pier bottom section 11 and a multi-section pier section 13 according to the height of the prefabricated pier body 1; when the pier bottom section 11 is cast, circular steel tubes and prestressed pipelines need to be embedded at four corners of a square reinforcement cage, so as to form the pier bottom section 11 with the prestressed pipelines and the concrete-filled steel tubes 7; pre-burying a prestressed pipeline when the pier body section 13 is cast and molded; the pier bottom section 11 and the multi-section pier section 13 are produced in a factory to produce the pier bottom section 11 with the pre-embedded steel pipe concrete 7 and the pre-stressed pore passage 8 and the pre-embedded prestressed pore passage 8 with the pre-embedded prestressed pore passage 8; wherein, the prestressed duct 8 is a polyvinyl chloride pipe. In order to facilitate assembly and increase the shear resistance, the support base 12 and the second concave-convex shear key 41 are directly formed when the pier bottom section 11 is poured, the shear-resistant studs 6 are embedded outside the support base 12, and the first concave-convex shear key 4 is directly formed when the pier body section 13 is poured;
reserving a second prestressed anchorage device 9 at the bottom of the base of the bearing platform 2, extending a prestressed rib 3 with enough length from the second prestressed anchorage device 9, then performing anchoring and fixing, and pouring concrete of the bearing platform 2; the bearing platform 2 is cast in place, so that the lower end of the prestressed tendon 3 is anchored on the bearing platform 2, then the bearing platform 2 with the square accommodating groove 21 is cast, and the shear-resistant stud 6 is embedded in the groove wall of the square accommodating groove 21;
moving the pier bottom section 11 to the installation position of the bearing platform 2, namely moving the pier bottom section 11 to the square accommodating groove 21, penetrating the prestressed tendons 3 through the pre-embedded prestressed pipeline, and tightly filling the joint of the pier bottom section 11 and the bearing platform 2 with concrete, namely tightly filling the square accommodating groove 21 and the supporting seat 12 with concrete; then, stacking the multiple pier bottom sections 11 on the pier bottom sections 11 one by one from bottom to top to form a prefabricated pier body 1; when the pier bottom sections 11 are stacked, the prestressed tendons 3 need to penetrate into the pre-buried prestressed pipelines; namely, when the prefabricated square pier body 1 is formed in a stacking mode, the prestressed tendons 3 need to penetrate through the pier bottom section 11 and the plurality of pier body sections 13 one by one so as to penetrate out of the top of the prefabricated square pier body 1.
After the prefabricated square pier body 1 is stacked and assembled, a first prestressed anchorage device 5 is installed at the top of the prefabricated square pier body 1, four prestressed tendons 3 penetrating out of the top of the prefabricated square pier body 1 penetrate through the first prestressed anchorage device 5, and the prestressed tendons 3 are tensioned by matching with the first prestressed anchorage device 5, so that post-tensioned prestressed force installation is achieved, and construction operation is completed.
The concrete-filled steel tubes 7 which are vertically arranged are arranged at four corners of the pier bottom section 11 of the prefabricated square pier body 1 formed by the construction method of the prefabricated sectional type pier in the embodiment, so that the energy consumption capability of the section edge of the pier bottom section 11 is improved, under earthquake disasters, the pressure resistance and ductility of a pressure-bearing area of the pier bottom section 11 can be increased by using the concrete-filled steel tubes 7, the bending ductility of a tension side can be increased, the integral earthquake-resistant extension effect of the pier is improved, and the effect of the concrete-filled steel tubes 7 is fully exerted; and, the first prestressed anchorage utensil 5 at prefabricated square pier body 1 top is through four eccentric arrangement's prestressing tendons 3 and the anchor of cushion cap 2, compares current pier of the same height, and the tensile arm of prestressing tendons 3, compressive arm are longer, and tensile resistance to compression effect is better to improve the self-restoration ability of pier.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a prefabricated segment type pier which characterized in that includes: the device comprises a bearing platform, a pre-stressed square pier body arranged on the bearing platform and four pre-stressed tendons; the center of the top surface of the prefabricated square pier body is provided with a first prestressed anchorage device, the prefabricated square pier body is provided with four prestressed ducts, the upper ends of the four prestressed ducts face the first prestressed anchorage device, and the lower ends of the four prestressed ducts are respectively positioned at four corners of the square bottom surface of the prefabricated square pier body; the bottom end of the prefabricated pier body is provided with a pier bottom section; the four corners of the pier bottom section are respectively provided with vertically arranged concrete filled steel tubes, and the prestressed pore channels penetrate through the concrete filled steel tubes; each prestressed tendon correspondingly penetrates through one prestressed duct, and the first prestressed anchorage device is connected with the bearing platform through four prestressed tendons.
2. The precast segmented pier according to claim 1, wherein a support seat is provided on an outer side surface of the pier bottom segment, and the support seat is located at a lower portion of the pier bottom segment.
3. The precast segmented pier according to claim 2, wherein the support seat is square, the bearing platform is provided with a square receiving groove for receiving the support seat, and four sides of the support seat and four groove walls of the square receiving groove are each provided with a plurality of shear studs.
4. The precast segmented pier of claim 1, wherein the precast pier body has a multi-segmented pier segment; the multistage pier body section from up piling up in proper order down on the pier base section, the multistage is worn to locate by the prestressing force pore canal in the pier body section.
5. The precast segmented pier according to claim 4, wherein two adjacent pier body segments are connected by a first male and female shear key.
6. The precast segmented pier of claim 5, wherein an adhesive is provided between contact surfaces of adjacent pier segments.
7. The precast segmented pier according to claim 4, wherein the lowermost pier body segment is connected to the pier bottom segment by a second concave-convex shear key.
8. The precast segmented pier according to claim 1, wherein a groove for receiving the first prestressed anchorage is provided at a top of the precast pier body.
9. The precast segmented pier according to claim 1, wherein four second prestressed anchorages are provided at the bottom of the cap, and each of the second prestressed anchorages is connected to one of the prestressed tendons.
10. A construction method of the prefabricated segmented pier as claimed in any one of claims 1 to 9, comprising:
preparing a pier bottom section and a multi-section pier body section according to the height of a prefabricated pier body; when the pier bottom section is cast and formed, circular steel tubes and prestressed pipelines are embedded at four corners of a square reinforcement cage to form the pier bottom section with the prestressed pipelines and concrete-filled steel tubes; pre-burying a prestressed pipeline when pouring and forming the pier body section;
reserving a second prestressed anchorage device at the bottom of the bearing platform base, extending prestressed ribs with enough length from the second prestressed anchorage device, then performing anchoring and fixing, and pouring concrete of the bearing platform;
moving the pier bottom section to the installation position of the bearing platform, enabling the prestressed tendons to penetrate through the pre-embedded prestressed pipeline, and adopting concrete to tightly fill and seal the joint of the pier bottom section and the bearing platform; stacking the multiple pier bottom sections on the pier bottom sections one by one from bottom to top to form a prefabricated pier body; when the pier bottom sections are stacked, the prestressed tendons need to penetrate into the pre-buried prestressed pipelines;
and after the prefabricated square pier bodies are stacked and assembled, mounting a first prestressed anchorage device at the top of the prefabricated square pier bodies, enabling the four prestressed tendons to penetrate through the first prestressed anchorage device, tensioning the prestressed tendons, and completing construction operation.
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| CN110468694A (en) * | 2019-09-06 | 2019-11-19 | 郑州大学 | Spigot-and-socket Self-resetting multi-segmental precast pier and its assembly method |
| CN111021237A (en) * | 2020-01-23 | 2020-04-17 | 福州大学 | Prefabricated assembled solid single-column pier based on root-enlarged section and construction method thereof |
| CN112853933A (en) * | 2021-02-24 | 2021-05-28 | 江南大学 | Segment prefabricated assembled concrete-filled steel tube pier with restorable function |
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| CN103374881A (en) * | 2012-04-24 | 2013-10-30 | 上海市政工程设计研究总院（集团）有限公司 | Prefabricated segment assembling pier structure system and construction method thereof |
| WO2016060334A1 (en) * | 2014-10-15 | 2016-04-21 | 중앙대학교 산학협력단 | Precast pier and precast pier construction method using same |
| CN110468694A (en) * | 2019-09-06 | 2019-11-19 | 郑州大学 | Spigot-and-socket Self-resetting multi-segmental precast pier and its assembly method |
| CN111021237A (en) * | 2020-01-23 | 2020-04-17 | 福州大学 | Prefabricated assembled solid single-column pier based on root-enlarged section and construction method thereof |
| CN112853933A (en) * | 2021-02-24 | 2021-05-28 | 江南大学 | Segment prefabricated assembled concrete-filled steel tube pier with restorable function |
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