CN113202016A - Prefabricated assembled hollow pier suitable for high-earthquake area and construction method - Google Patents
Prefabricated assembled hollow pier suitable for high-earthquake area and construction method Download PDFInfo
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- CN113202016A CN113202016A CN202010179357.6A CN202010179357A CN113202016A CN 113202016 A CN113202016 A CN 113202016A CN 202010179357 A CN202010179357 A CN 202010179357A CN 113202016 A CN113202016 A CN 113202016A
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 186
- 239000010959 steel Substances 0.000 claims abstract description 186
- 230000000149 penetrating effect Effects 0.000 claims abstract description 16
- 239000004567 concrete Substances 0.000 claims abstract description 14
- 238000004873 anchoring Methods 0.000 claims abstract description 11
- 239000003822 epoxy resin Substances 0.000 claims description 10
- 229920000647 polyepoxide Polymers 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 10
- 239000003292 glue Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000009417 prefabrication Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000011065 in-situ storage Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 230000003014 reinforcing effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 125000004122 cyclic group Chemical group 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 210000002435 tendon Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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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Abstract
The invention provides a prefabricated assembled hollow pier suitable for a high-seismic region and a construction method, and relates to the technical field of bridge construction. The foundation comprises a foundation, a bottom section, a middle section and a top section from bottom to top in sequence, wherein the foundation and the bottom section are completed by adopting one-time in-situ concrete pouring; the bottom section, the middle section and the top section are assembled in a prefabricating way; the top of the bottom section is embedded with a thick steel bar anchoring end; the top surface of the bottom section, the top surface and the bottom surface of the middle section and the bottom surface of the top section are all provided with annular shear keys; the top surface of the bottom section is pre-embedded with prestressed thick steel bars; the middle section and the top section are pre-embedded with coarse steel bar channels which are arranged in a penetrating way, prestressed coarse steel bars penetrate through the coarse steel bar channels, and the prestressed coarse steel bars are tensioned and anchored; and after the sections are assembled, penetrating the prestressed steel strand from the top surface of the top section, tensioning the prestressed steel strand through a steel strand tensioning end, wherein the steel strand tensioning end is respectively positioned on the top section and the bottom section. The energy consumption capability and the ductility of the assembled pier are improved.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a prefabricated assembled hollow pier suitable for a high-earthquake region and a construction method.
Background
At present, in projects such as roads, sea-crossing bridges and the like at home and abroad, when the pier height is high, hollow piers are often adopted, section-by-section templates need to be erected, steel bars are bound and concrete is poured during construction of the hollow piers, the construction procedures are multiple, the speed is low, a prefabrication and assembly method is adopted for construction, sections are prefabricated in a factory and then assembled on site, the advantages of high construction speed and efficiency, construction period saving, labor force saving and the like are achieved, and the requirements of rapid construction and construction are met.
The prefabricated assembled hollow pier is most commonly connected by adopting a prestress method, and all the sections are bonded by adopting epoxy resin glue. The prestressing force usually adopts thick steel bars or steel strands. When the thick steel bars are adopted, the number of the thick steel bars is often required to be more according to the stress requirement due to lower strength of the thick steel bars, so that the construction is inconvenient; the assembled pier is poor in self-resetting capability and large in residual deformation, the structure after an earthquake is large in residual deformation and cannot be repaired, and the assembled pier often has to be dismantled and rebuilt. When the steel strand is adopted, a U-shaped arrangement mode is often adopted, namely, prestress penetrates through the top of a bridge pier and then penetrates out of the top of the bridge pier, the prestress penetration is difficult, the number of the prestress bundles which are arranged in a mutual interference mode is limited, and the connection effect is influenced; and the assembled pier has insufficient energy consumption and low ductility and cannot be applied to high-seismic regions. Meanwhile, the bottom of the assembled pier is stressed greatly and is a plastic hinge area, when the assembled pier is applied to a high-earthquake area, how to ensure the performance of the bottom area becomes a concern point often limits the application of the prestressed connection prefabricated assembled pier in the high-earthquake area.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a prefabricated assembled hollow pier suitable for a high-earthquake area and a construction method, so as to solve the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a prefabricated assembled hollow pier suitable for high-earthquake areas, which sequentially comprises a foundation, a bottom section, a middle section and a top section from bottom to top, and also comprises: the foundation and the bottom segment are finished by adopting one-time cast-in-place concrete; the bottom section, the middle section and the top section are assembled in a prefabricating way; the top of the bottom section is embedded with a thick steel bar anchoring end; the top surface of the bottom section, the top surface and the bottom surface of the middle section and the bottom surface of the top section are all provided with annular shear keys; the top surface of the bottom section is pre-embedded with prestressed thick steel bars; coarse steel bar channels are pre-embedded in the middle section and the top section, prestressed coarse steel bars penetrate through the coarse steel bar channels, and the prestressed coarse steel bars are tensioned and anchored; after the sections are assembled, a prestressed steel strand penetrates through the top surface of the top section, the prestressed steel strand is tensioned through a steel strand tensioning end, and the steel strand tensioning end is located on the top section and the bottom section respectively.
On the basis of the scheme, furthermore, the height of the bottom section is not less than 1-1.5 times of the length of the short side of the pier column, and in addition, dense steel bars are arranged in the bottom section, so that the bottom section and the foundation are integrated.
In addition to any one of the above aspects, the annular shear key has a trapezoidal structure, the bottom width is at least 1/2 of the wall thickness of the pier column, and the height is 1/3-1/2 of the wall thickness of the pier column.
On the basis of any one of the above schemes, further, the annular shear key is arranged along the periphery of the pier wall of the pier, and the shear key steel bars are arranged in the annular shear key.
By combining the two schemes, the upper and lower shear keys have enough lap joint length, and the mutual shear resistance effect is ensured; the annular shear keys are arranged along the periphery of the pier wall, and shear key steel bars are arranged inside the annular shear keys; compare general concrete shear force key and follow the isolated arrangement of mound wall direction, and highly less, the reinforcing bar can't be arranged to inside, for plain concrete structure, cyclic annular shear force key size is great, and inside can lay the reinforcing bar, and the cyclic annular ability of shearing of arranging is stronger, and the die block board is more regular, and it is convenient to make.
It needs to be supplemented that the thick steel bar pipelines and the steel strand pipelines are arranged in a full-length mode, and the pipelines between the segments correspond to one another.
It needs to be supplemented that the prestressed thick steel bars adopt a bonding mode to carry out grouting on the pipeline, so that the cooperative stress between the thick steel bars and the sections is enhanced, and the connection performance is improved.
On the basis of any one of the above schemes, further, the prestressed thick steel bars are anchored in sections, the prestressed thick steel bars are tensioned through thick steel bar tensioning ends, the thick steel bar tensioning ends are located on the top surfaces of the sections, and after the middle section is installed, a part of the thick steel bars can be tensioned and anchored; and lengthening the other part of the thick steel bars, connecting the lengthened thick steel bars through a connector, anchoring after installing an intermediate section until the top section is installed, and tensioning the pier top of the pier. Therefore, the stress of the structure is gradually increased along the bottom section and upwards to the top section, the number of the thick steel bars passing through the sections is gradually increased, the structural arrangement is matched with the stress, and the economy is improved.
It needs to be supplemented that the prestressed steel strand adopts an unbonded mode, the pipeline is not subjected to grouting, self-resetting capability is provided for the assembly pier through the steel strand, residual deformation is reduced, and the post-earthquake restoration capability is improved.
On the basis of any above-mentioned scheme, it is further, steel strand wires stretch-draw end is provided with stretch-draw end anchor groove, set up the protective cover on the stretch-draw end anchor groove, the protective cover passes through the bolt and links to each other with each festival section, makes things convenient for the dismouting, and the operation process can be inspected the prestressing force steel strand wires to can change as required, be applicable to the condition that the prestressing force steel strand wires need not be changed greatly when shaking back structural loss.
On the basis of any one of the above schemes, further, a tensioning end anchor groove is reserved during bottom section cast-in-place construction, the prestressed steel strand below is anchored in the tensioning end anchor groove, two-end tensioning is adopted, the tensioning end anchor groove of the bottom section is located at the pier bottom part, tensioning is convenient, the stretching is convenient, the penetrating is convenient, the arrangement is flexible, and the defect of arrangement of U-shaped prestressed tendons is avoided.
On the basis of any one of the above schemes, further, the prestressed thick steel bars and the prestressed steel strands are respectively arranged on the inner side and the outer side of the pier wall of the pier, and compared with the traditional arrangement in the middle of the pier wall, the connecting effect of the whole section is favorably ensured.
On the basis of any one of the above schemes, further, the prestressed steel strand adopts an unbonded steel strand, no grouting is performed in the anchor groove at the tensioning end, and the prestressed steel strand can be replaced.
The invention provides a construction method of a prefabricated and assembled hollow pier suitable for a high-earthquake region, wherein the hollow pier sequentially comprises a foundation, a bottom section, a middle section and a top section from bottom to top, and the construction method comprises the following steps:
firstly, constructing a foundation and a bottom section, wherein concrete is integrally poured once, and a middle section and a top section are prefabricated to be assembled;
secondly, hoisting the middle section, coating splicing seam epoxy resin glue on the top surface of the bottom section, lengthening the prestressed thick steel bars pre-embedded in the bottom section through a connector, penetrating into a thick steel bar pipeline of the middle section, tensioning a part of prestressed thick steel bars, and injecting grouting material of the part of thick steel bar pipeline;
hoisting the next middle section, coating a splicing seam epoxy resin adhesive on the top surface of the previous middle section, lengthening the prestressed thick steel bar embedded in the previous middle section through a connector, penetrating into the thick steel bar pipeline of the next middle section, tensioning the other part of the prestressed thick steel bar, and injecting grouting material of the part of the thick steel bar pipeline;
step four, sequentially installing the middle sections in the same manner as the step three;
hoisting the top section, coating splicing seam epoxy resin glue on the top surface of the middle section, lengthening the prestressed coarse steel bars pre-embedded in the middle section through a connector, penetrating into the coarse steel bar pipeline of the top section, tensioning the residual prestressed coarse steel bars, and injecting pressure slurry to the residual coarse steel bar pipeline;
step six, sequentially penetrating prestressed steel strands into steel strand pipelines of a bottom section, a middle section and a top section from the top, tensioning two ends of tensioning ends of the top and bottom steel strands, and anchoring;
and seventhly, mounting a protective cover at the position of the anchor groove at the tensioning end, and finishing construction.
The invention has the beneficial effects that:
the prefabricated assembled hollow pier suitable for the high-earthquake area and the construction method can obtain the following effects:
1. the prestressed coarse steel bars and the prestressed steel strands are connected together, so that the energy consumption capability and ductility of the assembled pier are improved, the self-resetting capability is realized, and the residual deformation is small; the prestressed coarse steel bars and the prestressed steel strands are convenient to construct, flexible in arrangement and small in mutual interference, multiple groups can be arranged, the stress requirement is met, and the prestressed coarse steel bars and the prestressed steel strands can be applied to high-intensity seismic areas;
2. the stress of the plastic hinge area at the bottom of the assembled pier is enhanced by integrally pouring the bottom section and the foundation at one time, and the stress requirement of a high-vibration area is met;
3. the annular shear keys are arranged among the segments, and the segments are of a reinforced concrete structure and have strong shear resistance;
4. the anchor groove at the tensioning end of the prestressed steel strand is not poured with anchor sealing concrete, the protective cover is arranged on the anchor groove and is connected through bolts, so that the anchor groove is convenient to disassemble and assemble, the prestressed steel strand is convenient to check in the operation process and can be replaced according to needs, and the anchor groove is suitable for the condition that the prestressed steel strand needs to be replaced when the structural loss is small after an earthquake;
5. the prestressed thick steel bars are anchored in sections, and joints can be pre-pressed in the construction process and the stability of the sections is ensured; along bottom section upwards to top section, the structure atress crescent, the thick reinforcing bar quantity that passes through in the section increases gradually, and the structure is arranged and is forced the phase-match, has improved economic nature.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic elevation structure view of a prefabricated assembled hollow pier suitable for a high-earthquake region, provided by an embodiment of the invention;
FIG. 2 is a schematic plane structure diagram of a prefabricated assembled hollow pier suitable for a high-seismic region, provided by the embodiment of the invention;
FIG. 3 is a schematic view of a bottom section elevation structure of a prefabricated assembled hollow pier suitable for high-earthquake areas, provided by the embodiment of the invention;
fig. 4 is a schematic diagram of assembling a middle section of a prefabricated hollow pier suitable for a high-seismic region according to an embodiment of the invention;
FIG. 5 is a schematic cross-sectional view taken at I-I of FIG. 4 according to an embodiment of the present invention;
fig. 6 is a schematic diagram of assembling a middle section and a top section of a prefabricated hollow pier suitable for a high-seismic region according to an embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of | - | | in fig. 6 according to an embodiment of the present invention.
Icon:
1-a base;
2-a bottom segment;
3-an intermediate section;
4-top segment;
5-splicing seams;
6-annular shear key;
61-shear bond reinforcement;
7-prestressed coarse steel bars;
71-a coarse steel bar pipeline;
72-a connector;
73-the thick steel bar stretching end;
74-thick steel bar anchoring end;
8-prestressed steel strands;
81-steel strand pipe;
82-steel strand tensioning end;
9-pressing slurry;
10-tensioning end anchor grooves;
11-protective cover.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
As shown in fig. 1 to 7, for the structural schematic diagrams of the prefabricated assembled hollow pier suitable for the high-earthquake area provided by the embodiment of the present invention, the hollow pier and the construction method of the hollow pier are described with reference to the accompanying drawings, and the specific structures and steps are as follows.
The embodiment of the invention provides a prefabricated assembled hollow pier suitable for a high-earthquake region, which comprises a foundation 1, a bottom section 2, a middle section 3 and a top section 4 from bottom to top as shown in figures 1-7, and further comprises: the foundation 1 and the bottom section 2 are completed by adopting one-time in-situ concrete pouring; the bottom section 2, the middle section 3 and the top section 4 are assembled in a prefabricating way; the top of the bottom section 2 is embedded with a thick steel bar anchoring end 74; the top surface of the bottom section 2, the top surface and the bottom surface of the middle section 3 and the bottom surface of the top section 4 are all provided with annular shear keys 6; the top surface of the bottom section 2 is pre-embedded with prestressed thick steel bars 7; coarse steel bar channels are pre-embedded in the middle section 3 and the top section 4, prestressed coarse steel bars 7 penetrate through the coarse steel bar channels, and the prestressed coarse steel bars 7 are tensioned and anchored; after the segments are assembled, the prestressed steel strand 8 penetrates from the top surface of the top segment, the prestressed steel strand 8 is tensioned through the steel strand tensioning end 82, and the steel strand tensioning end 82 is located on the top segment 4 and the bottom segment 2 respectively.
The alternative of this embodiment is, the height of end section 2 is not less than 1 ~ 1.5 times pier stud minor face length, in addition, arranges denser reinforcing bar in end section inside, makes end section and basis form wholly.
The annular shear key 6 is of a trapezoidal structure, the bottom width is at least 1/2 of the wall thickness of the pier column, and the height is 1/3-1/2 of the wall thickness of the pier column.
The alternative of this embodiment is that annular shear key 6 is arranged along pier wall periphery, and shear key reinforcing bars 61 are arranged inside annular shear key 6.
By combining the two schemes, the upper and lower shear keys have enough lap joint length, and the mutual shear resistance effect is ensured; the annular shear keys are arranged along the periphery of the pier wall, and shear key steel bars are arranged inside the annular shear keys; compare general concrete shear force key and follow the isolated arrangement of mound wall direction, and highly less, the reinforcing bar can't be arranged to inside, for plain concrete structure, cyclic annular shear force key size is great, and inside can lay the reinforcing bar, and the cyclic annular ability of shearing of arranging is stronger, and the die block board is more regular, and it is convenient to make.
It needs to be supplemented that the thick steel bar pipelines and the steel strand pipelines are arranged in a full-length mode, and the pipelines between the segments correspond to one another.
It needs to be supplemented that the prestressed thick steel bars adopt a bonding mode to carry out grouting on the pipeline, so that the cooperative stress between the thick steel bars and the sections is enhanced, and the connection performance is improved.
The alternative scheme of this embodiment is that the prestressed thick steel bar 7 is anchored in segments, the prestressed thick steel bar 7 is tensioned through the thick steel bar tensioning end 73, the thick steel bar tensioning end 73 is located on the top surface of each segment, and after the middle segment 3 is installed, a part of the thick steel bar can be tensioned and anchored; and lengthening the other part of the thick steel bars, connecting the lengthened thick steel bars through a connector 72, anchoring after installing a middle section 3 until the top section 4 is installed, and tensioning on the pier top of the pier. Therefore, the stress of the structure is gradually increased along the bottom section and upwards to the top section, the number of the thick steel bars passing through the sections is gradually increased, the structural arrangement is matched with the stress, and the economy is improved.
The prestressed steel strand is in an unbonded mode, the pipeline is not subjected to grouting, self-resetting capability is provided for the assembled pier through the steel strand, residual deformation is reduced, and the post-earthquake restoration capability is improved.
The alternative of this embodiment does, and steel strand wires stretch-draw end 82 is provided with stretch-draw end anchor groove 10, sets up protective cover 11 on the stretch-draw end anchor groove 10, and protective cover 11 passes through the bolt and links to each other with each segment section, makes things convenient for the dismouting, and the operation process can be inspected the prestressing force steel strand wires to can change as required, be applicable to when the condition that the not very big prestressing force steel strand wires of change of shake back structural loss.
The alternative of this embodiment is that, the reservation has tensioning end anchor socket 10 during the cast-in-place construction of bottom subsection 2, and 8 below anchor in tensioning end anchor socket 10 of prestressing force stranded conductor adopt both ends stretch-draw, and the tensioning end anchor socket of bottom subsection is located pier bottom position, and the stretch-draw of being convenient for, and wear to restraint conveniently, arrange in a flexible way, avoid the shortcoming that U type prestressing tendons arranged.
The alternative of this embodiment does, and prestressing force thick steel bar 7 and prestressing force steel strand wires 8 set up respectively in the inside and outside of pier mound wall, compare the tradition and arrange in the middle of the mound wall, are favorable to guaranteeing whole sectional linkage effect.
The alternative of this embodiment is that, prestressed steel strand 8 adopts the unbonded steel strand, and the tensioning end anchor groove 10 is interior not to be grouted, and prestressed steel strand 8 can be changed.
The embodiment of the invention provides a construction method of a prefabricated assembled hollow pier suitable for a high-earthquake region, wherein the hollow pier sequentially comprises a foundation 1, a bottom section 2, a middle section 3 and a top section 4 from bottom to top, and the construction method comprises the following steps:
firstly, constructing a foundation 1 and a bottom section 2, integrally pouring concrete once, and prefabricating a middle section 3 and a top section 4 to be assembled;
secondly, hoisting the middle section 3, smearing splicing seams 5 of epoxy resin glue on the top surface of the bottom section 2, lengthening the prestressed coarse steel bars 7 pre-embedded in the bottom section 2 through a connector 72, penetrating into a coarse steel bar pipeline 71 of the middle section 3, tensioning a part of the prestressed coarse steel bars 7, and injecting grouting material of the part of the coarse steel bar pipeline 71;
hoisting the next middle section 3, coating a splicing seam 5 of epoxy resin adhesive on the top surface of the previous middle section 3, lengthening the prestressed coarse steel bars 7 pre-embedded in the previous middle section 3 through a connector 72, penetrating into a coarse steel bar pipeline 71 of the next middle section 3, tensioning the other part of the prestressed coarse steel bars 7, and injecting grouting material for the part of the coarse steel bar pipeline 71;
step four, sequentially installing the middle sections 3 in the same manner as the step three;
fifthly, hoisting the top section 4, smearing splicing seams 5 of epoxy resin glue on the top surface of the middle section 3, lengthening the prestressed thick steel bars 7 pre-embedded in the middle section 3 through a connector 72, penetrating into the thick steel bar pipeline 71 of the top section 4, tensioning the residual prestressed thick steel bars 7, and injecting pressure slurry 9 into the residual thick steel bar pipeline 71;
step six, sequentially penetrating prestressed steel strands 8 into the steel strand pipelines 81 of the bottom section 2, the middle section 3 and the top section 4 from the top, tensioning two ends of a top steel strand tensioning end 82 and a bottom steel strand tensioning end 82, and anchoring;
and seventhly, mounting a protective cover 11 at the position of the anchor groove 10 at the tensioning end, and finishing construction.
The prefabricated assembled hollow pier suitable for the high-earthquake area and the construction method provided by the embodiment of the invention can obtain the following effects:
1. the prestressed thick steel bars 7 and the prestressed steel strands 8 are connected together, so that the energy consumption capacity and ductility of the assembled pier are improved, the self-resetting capacity is realized, and the residual deformation is small; the prestressed coarse steel bars 7 and the prestressed steel strands 8 are convenient to construct, flexible in arrangement and small in mutual interference, multiple groups can be arranged, the stress requirement is met, and the prestressed coarse steel bars and the prestressed steel strands can be applied to high-intensity seismic areas;
2. the bottom section 2 and the foundation 1 are integrally cast at one time, so that the stress of a plastic hinge area at the bottom of the assembled pier is enhanced, and the stress requirement of a high-vibration area is met;
3. the annular shear keys 6 are arranged among the segments, and the segments are strong in shearing resistance by adopting a reinforced concrete structure;
4. the prestressed steel strand tensioning end anchor groove 10 is not poured with anchor sealing concrete, the tensioning end anchor groove 10 is provided with the protective cover 11, the protective cover 11 is connected through bolts, so that the assembly and disassembly are convenient, the operation process is convenient for inspecting the prestressed steel strand 8, the prestressed steel strand 8 can be replaced according to needs, and the prestressed steel strand tensioning end anchor groove is suitable for the situation that the prestressed steel strand 8 needs to be replaced when the structural loss is not large after an earthquake;
5. the prestressed thick steel bar 7 is anchored in sections, and joints can be pre-pressed in the construction process and the stability of the sections is ensured; along bottom section 2 upwards to top section 4, the structure atress crescent, the thick reinforcing bar quantity that passes through in the section increases gradually, and the structure is arranged and is forced the phase-match, has improved economic nature.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a hollow pier is assembled in prefabrication suitable for high earthquake district, by down and on in proper order including basis (1), bottom segment (2), middle segment (3) and top segment (4), its characterized in that still includes:
the foundation (1) and the bottom section (2) are completed by adopting one-time cast-in-place concrete;
the bottom section (2), the middle section (3) and the top section (4) are assembled in a prefabricating way;
the top of the bottom section (2) is embedded with a thick steel bar anchoring end (74);
the top surface of the bottom section (2), the top surface and the bottom surface of the middle section (3) and the bottom surface of the top section (4) are all provided with annular shear keys (6);
the top surface of the bottom section (2) is pre-embedded with prestressed thick steel bars (7);
coarse steel bar channels which are arranged in a penetrating mode are pre-embedded in the middle section (3) and the top section (4), prestressed coarse steel bars (7) penetrate through the coarse steel bar channels, and the prestressed coarse steel bars (7) are tensioned and anchored;
after the sections are assembled, a prestressed steel strand (8) penetrates from the top surface of the top section, the prestressed steel strand (8) is tensioned through a steel strand tensioning end (82), and the steel strand tensioning end (82) is located on the top section (4) and the bottom section (2) respectively.
2. The prefabricated assembled hollow pier suitable for high-earthquake areas as claimed in claim 1, wherein the height of the bottom section (2) is not less than 1-1.5 times of the length of the short side of the pier column.
3. The prefabricated assembled hollow pier suitable for the high-earthquake-region as claimed in claim 1, wherein the annular shear key (6) is of a trapezoidal structure, the bottom width is at least 1/2 of the wall thickness of the pier column, and the height is 1/3-1/2 of the wall thickness of the pier column.
4. The prefabricated assembled hollow pier suitable for the high-earthquake-region as claimed in claim 3, wherein the annular shear keys (6) are arranged along the periphery of the pier wall, and shear key steel bars (61) are arranged inside the annular shear keys (6).
5. The prefabricated assembled hollow pier suitable for high-earthquake areas as claimed in claim 1, wherein the prestressed coarse steel bars (7) are anchored in sections, the prestressed coarse steel bars (7) are tensioned through coarse steel bar tensioning ends (73), the coarse steel bar tensioning ends (73) are located on the top surfaces of the sections, and after the middle section (3) is installed, a part of the coarse steel bars can be tensioned and anchored; and lengthening the other part of the thick steel bars, connecting the lengthened thick steel bars through a connector (72), anchoring after installing an intermediate segment (3) until the top segment (4) is installed, and tensioning at the pier top of the pier.
6. The precast assembled hollow pier applicable to high-earthquake areas as claimed in claim 1, wherein the steel strand tension ends (82) are provided with tension end anchor grooves (10), the tension end anchor grooves (10) are provided with protecting covers (11), and the protecting covers (11) are connected with the segments through bolts.
7. The precast assembled hollow pier applicable to high-earthquake areas as claimed in claim 1, wherein a tensioning end anchor groove (10) is reserved in the cast-in-place construction of the bottom section (2), and the lower part of the prestressed steel strand (8) is anchored in the tensioning end anchor groove (10).
8. The prefabricated assembled hollow pier suitable for the high-earthquake-region as claimed in claim 1, wherein the prestressed reinforcement bars (7) and the prestressed steel strands (8) are respectively arranged on the inner side and the outer side of the pier wall.
9. The prefabricated assembled hollow pier suitable for the high-earthquake-region as claimed in claim 6, wherein the prestressed steel strand (8) is an unbonded steel strand, no grouting is performed in the tensioning end anchor groove (10), and the prestressed steel strand (8) can be replaced.
10. The utility model provides a construction method suitable for hollow pier is assembled in prefabrication of high earthquake district, hollow pier is by lower and last basis (1), bottom segment (2), middle segment (3) and top segment (4) of including in proper order, its characterized in that includes following step:
firstly, constructing a foundation (1) and a bottom section (2), wherein concrete is integrally poured once, and a middle section (3) and a top section (4) are prefabricated to be assembled;
secondly, hoisting the middle section (3), smearing splicing seams (5) with epoxy resin glue on the top surface of the bottom section (2), lengthening the prestressed coarse steel bars (7) pre-embedded in the bottom section (2) through a connector (72), penetrating into a coarse steel bar pipeline (71) of the middle section (3), tensioning a part of the prestressed coarse steel bars (7), and injecting grouting material of the part of the coarse steel bar pipeline (71);
hoisting the next middle section (3), coating a splicing seam (5) with epoxy resin adhesive on the top surface of the previous middle section (3), lengthening the prestressed coarse steel bars (7) pre-embedded in the previous middle section (3) through a connector (72), penetrating into a coarse steel bar pipeline (71) of the next middle section (3), tensioning the other part of the prestressed coarse steel bars (7), and injecting grouting material of the part of the coarse steel bar pipeline (71);
step four, sequentially installing the middle sections (3) in the same way as the step three;
fifthly, hoisting the top section (4), smearing splicing seams (5) with epoxy resin glue on the top surface of the middle section (3), lengthening the prestressed coarse steel bars (7) pre-embedded in the middle section (3) through a connector (72), penetrating into a coarse steel bar pipeline (71) of the top section (4), tensioning the residual prestressed coarse steel bars (7), and injecting pressure slurry (9) into the residual coarse steel bar pipeline (71);
step six, sequentially penetrating prestressed steel strands (8) into steel strand pipelines (81) of a bottom section (2), a middle section (3) and a top section (4) from the top, tensioning two ends of a top steel strand tensioning end (82) and a bottom steel strand tensioning end, and anchoring;
and seventhly, mounting a protective cover (11) at the position of the anchor groove (10) at the tensioning end, and finishing construction.
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| CN202010179357.6A CN113202016A (en) | 2020-03-14 | 2020-03-14 | Prefabricated assembled hollow pier suitable for high-earthquake area and construction method |
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| CN202010179357.6A CN113202016A (en) | 2020-03-14 | 2020-03-14 | Prefabricated assembled hollow pier suitable for high-earthquake area and construction method |
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Cited By (1)
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