CN114319084A - Local UHPC recoverable function self-resetting prefabricated two-way coupled high-speed railway pier - Google Patents
Local UHPC recoverable function self-resetting prefabricated two-way coupled high-speed railway pier Download PDFInfo
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- CN114319084A CN114319084A CN202111615200.4A CN202111615200A CN114319084A CN 114319084 A CN114319084 A CN 114319084A CN 202111615200 A CN202111615200 A CN 202111615200A CN 114319084 A CN114319084 A CN 114319084A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 176
- 239000010959 steel Substances 0.000 claims abstract description 176
- 238000010276 construction Methods 0.000 claims abstract description 22
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 239000011159 matrix material Substances 0.000 claims abstract description 9
- 238000009417 prefabrication Methods 0.000 claims abstract description 7
- 230000002457 bidirectional effect Effects 0.000 claims description 16
- 238000010168 coupling process Methods 0.000 claims description 16
- 238000005859 coupling reaction Methods 0.000 claims description 16
- 230000002787 reinforcement Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 2
- 239000011440 grout Substances 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 22
- 238000010008 shearing Methods 0.000 abstract description 9
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 238000009439 industrial construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a self-resetting prefabricated two-way coupled high-speed railway pier with a local UHPC (ultra high performance concrete) restorable function, which comprises a bearing platform and a cover beam supported above the bearing platform through a vertical supporting structure, wherein the cover beam is a prefabricated part; the vertical supporting structure comprises a prefabricated bridge pier bottom section, a prefabricated bridge pier-connecting beam section and unbonded prestressed steel strands; the prefabricated pier bottom sections are fixed on the bearing platform in a matrix arrangement shape; the top surface of the prefabricated bridge pier bottom segment is provided with a prefabricated bridge pier-connecting beam segment; the prefabricated pier-connecting beam sections comprise prefabricated pier sections and prefabricated connecting beams; the invention provides a feasible structural form for the application of a prefabrication construction technology of a high-speed rail pier, and by utilizing the structural form, the structural rigidity requirement and the rapid construction requirement can be considered, the shearing state of the pier can be improved, the pier can be ensured to have good deformation capacity under the action of an earthquake, only replaceable damage elements are damaged, the prefabricated high-speed rail pier is further developed into a post-earthquake function recoverable structure, and the toughness and earthquake resistance requirement is met.
Description
Technical Field
The invention relates to a self-reset prefabricated bidirectional coupled high-speed rail pier with a function capable of being restored by local UHPC (ultra high performance concrete), can realize quick restoration of the function of the pier after an earthquake, and belongs to the technical field of earthquake resistance and shock absorption of bridge engineering.
Background
The high-speed railway bridge has large volume and wide range and high standardization degree, and is suitable for popularizing the industrial construction of the bridge. At present, the prefabrication production level of the upper structure of the high-speed railway bridge is higher, and the lower structure still takes the traditional cast-in-place construction as the main. The existing prefabricated bridge pier construction technology mainly aims at a highway or a municipal bridge, and firstly, the bridge pier is vertically divided into a plurality of sections according to the requirements of transportation, hoisting and the like in the construction process, and then the plurality of prefabricated sections are assembled into a whole on site. Compared with a highway bridge or a municipal bridge, the high-speed rail bridge adopts the gravity type pier with a large section and a small slenderness ratio for meeting the rigidity requirement, the shearing force which needs to be borne under the earthquake action is large, if the high-speed rail bridge is still only divided vertically, the high-speed rail bridge pier needs to be divided into more vertical sections to meet the requirements of transportation, hoisting and the like, the lateral rigidity of the high-speed rail pier can be influenced, and the shearing resistance of the high-speed rail pier can be further weakened by too many assembly joints. Therefore, it is not suitable to directly apply the prefabrication construction technology of the highway or the municipal pier to the high-speed railway pier. In addition, the traditional high-speed rail gravity type pier has low reinforcement ratio and poor anti-seismic performance, is not matched with the high safety level of the whole high-speed rail system, develops the prefabrication construction technology of the high-speed rail pier, is not only based on rapid construction, but also can obviously improve the anti-seismic performance of the high-speed rail pier.
The toughness anti-seismic method becomes a research hotspot in the field of engineering anti-seismic and shock absorption at present, and requires that the structure not only can keep 'no fall' under the action of an earthquake, but also can concentrate earthquake damage on a specific part, and the specific part is easy to repair quickly, so that the structure meeting the toughness anti-seismic requirement has good capability of recovering functions after the earthquake. In practice, in order to ensure that the structure has good capability of recovering functions after earthquake, the part with larger deformation is usually selected to be provided with the replaceable damage element, the replaceable damage element and the part with larger deformation are connected through the mechanical connecting device so as to be quickly replaced after earthquake, the part with larger deformation is subjected to special structural design, and the part is ensured not to be damaged by earthquake but only damaged by the replaceable damage element under the condition of larger deformation. The method comprises the steps of determining a large deformation part, selecting a position for arranging a replaceable damage element from the large deformation part, selecting a reasonable connection mode between the large deformation part and the replaceable damage element, and ensuring that the large deformation part is not damaged under the action of an earthquake, wherein the contents are contents which need to be considered in the toughness earthquake-proof design of the structure, and the method also determines that the traditional cast-in-place concrete structure is difficult to naturally meet the requirement of the toughness earthquake-proof design and needs structural innovation.
The invention relates to a structure form suitable for a prefabricated construction technology, aiming at a high-speed rail pier, and the structure form can not only give consideration to the structural rigidity requirement and the rapid construction requirement and improve the shearing state of the pier, but also ensure that the pier has good deformation capacity under the action of an earthquake and only a replaceable damage element is damaged, further develop the prefabricated high-speed rail pier into a post-earthquake function recoverable structure, and has important practical significance and engineering value.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, provides a self-resetting prefabricated two-way coupled high-speed rail pier with a local UHPC (ultra high performance concrete) restorable function, provides a feasible structural form for a high-speed rail pier by using a prefabricated construction technology, can give consideration to structural rigidity requirement and rapid construction requirement, improves the sheared state of the pier, ensures that the pier has good deformation capability under the action of an earthquake and is damaged only by a replaceable damage element, further develops the prefabricated high-speed rail pier into a post-earthquake function restorable structure, and meets the requirements of toughness and earthquake resistance.
In order to solve the technical problems, the invention adopts the technical scheme that:
a self-reset prefabricated two-way coupled high-speed railway pier with a local UHPC recoverable function comprises a bearing platform and a cover beam supported above the bearing platform through a vertical supporting structure,
the cover beam is a prefabricated part; the vertical supporting structure comprises a prefabricated bridge pier bottom section, a prefabricated bridge pier-connecting beam section and unbonded prestressed steel strands;
the prefabricated pier bottom sections are fixed on the bearing platform in a matrix arrangement shape;
the top surface of the prefabricated bridge pier bottom segment is provided with a prefabricated bridge pier-connecting beam segment;
the prefabricated pier-connecting beam sections comprise prefabricated pier sections and prefabricated connecting beams;
the prefabricated pier segment is fixed at the top end of the prefabricated pier bottom segment along the extension line of the center line of the prefabricated pier bottom segment;
prefabricated connecting beams are transversely arranged between the adjacent prefabricated pier sections and fixedly connected to the side surfaces of the prefabricated pier sections;
pipelines allowing unbonded prestressed steel strands to transversely penetrate through are reserved in the prefabricated connecting beam and the prefabricated pier sections, and the unbonded prestressed steel strands transversely penetrate through and are connected with the prefabricated connecting beam and the prefabricated pier sections;
the longitudinal section of the joint of the precast pier segment and the precast connecting beam is L-shaped;
the joints of the prefabricated pier sections and the prefabricated connecting beams are fixedly connected through angle steel, connecting bolts and connecting nuts; the angle steel is attached to the joint of the prefabricated connecting beam and the prefabricated pier section, and is fixed at the joint of the prefabricated connecting beam and the prefabricated pier section through the connecting bolt and the connecting nut.
As a further preferable scheme of the present invention, a contact region between the bearing platform and the prefabricated pier base section, a bottom region of the prefabricated pier base section, a pier region between the prefabricated pier section and the prefabricated connecting beam in the prefabricated pier section, and a connecting beam region between the prefabricated pier section and the prefabricated connecting beam in the prefabricated connecting beam are all made of ultra-high performance concrete.
As a further preferable scheme of the invention, the prefabricated bridge pier further comprises a plurality of connecting steel bars, the connecting steel bars are distributed along the longitudinal direction of the prefabricated bridge pier bottom sections, the edges of the connecting steel bars, which are close to the prefabricated bridge pier bottom sections, are arranged in a matrix manner, and the connecting steel bars longitudinally penetrate through the connecting bearing platform, the prefabricated bridge pier bottom sections, the prefabricated bridge pier sections and the cover beams.
As a further preferred scheme of the invention, a plurality of unbonded prestressed steel strands parallel to the connecting steel bars are further arranged in the connecting steel bar matrix, and the unbonded prestressed steel strands longitudinally penetrate through the embedded pipeline to connect the bearing platform, the prefabricated pier bottom segment, the prefabricated pier segment and the capping beam.
As a further preferable scheme of the invention, a steel cover plate is further arranged at the joint of the prefabricated pier segment and the prefabricated connecting beam, the connecting steel cover plate is arranged between the angle steel and the connecting nut, and the connecting bolt, the connecting nut and the steel cover plate are matched with each other to fixedly connect the angle steel, the prefabricated connecting beam and the prefabricated pier segment.
As a further preferable scheme of the present invention, the connecting steel bars include embedded steel bars in a bearing platform, embedded steel bars in a prefabricated pier bottom section, prefabricated pier sections, and embedded steel bars in a capping beam;
the embedded steel bars in the bearing platform are connected with the embedded steel bars in the prefabricated bridge pier bottom section through a half grouting sleeve, the embedded steel bars in the prefabricated bridge pier bottom section are connected with the embedded steel bars in the prefabricated bridge pier section and the cover beam through a mechanical sleeve, and the embedded steel bars in the bridge pier section and the cover beam are anchored in the prefabricated bridge pier section and the cover beam through grouting corrugated pipe connection technology.
As a further preferable scheme of the invention, a non-adhesive section is arranged at the bottom joint of the embedded steel bars in the bearing platform.
As a further preferred solution of the present invention, 4 vertical support structures are arranged in an array on the platform.
As a further preferable scheme of the invention, the angle steel is made of mild steel, and the connecting bolt, the connecting steel cover plate and the connecting nut are all made of high-strength steel.
According to the UHPC local enhancement restorable function self-resetting prefabricated bidirectional coupled high-speed rail bridge pier, a construction method of the UHPC local enhancement restorable function self-resetting prefabricated bidirectional coupled high-speed rail bridge pier is provided, and the construction method comprises the following steps:
step 1, assembling prefabricated pier-coupling beam sections in a prefabrication plant: the prefabricated pier-connecting beam segment comprises a prefabricated pier segment, a prefabricated connecting beam, angle steel, a steel cover plate, a connecting nut and connecting bolts which are respectively pre-buried in the prefabricated pier segment and the prefabricated connecting beam;
and 6, leading out the unbonded prestressed steel strand from the pipeline of the unbonded prestressed steel strand in the prefabricated light capping beam, and permanently applying prestress on the whole prefabricated high-speed rail pier so as to finish the installation work of the whole prefabricated high-speed rail pier.
The invention has the following beneficial effects:
1. the prefabricated module is reasonably divided, and the lateral rigidity and the shearing resistance of the pier are ensured: the high-speed rail gravity type pier is divided into the prefabricated pier bottom section, the prefabricated pier-connecting beam module and the prefabricated light capping beam in a longitudinal and transverse mixed dividing mode, and the problem that the lateral rigidity and the shearing resistance of the high-speed rail pier are affected due to the fact that too many sections and joints are easily caused by the traditional single vertical dividing mode is solved.
2. Increase and cut span ratio, improve the pier and receive the shear state: the invention adopts a bidirectional coupled structure form, and achieves the purpose of obtaining larger lateral rigidity with smaller section size through the combined action between the prefabricated bridge pier and the prefabricated coupling beam, compared with a high-speed rail gravity type bridge pier with the same height and lateral rigidity, the shear span ratio of the prefabricated bridge pier is increased by more than 2 times, the shearing state of the prefabricated bridge pier is improved, and the risk of brittle shearing damage of the prefabricated bridge pier under the earthquake action is greatly reduced.
3. The pier has the advantages of rapid construction, good deformation and self-resetting capability under the action of earthquake: the invention divides the high-speed rail pier into a prefabricated pier bottom segment, a prefabricated pier-connecting beam module and a prefabricated light capping beam, wherein the prefabricated pier-coupling beam module is assembled before hoisting, the assembly of the whole high-speed railway pier on site only needs to adopt vertical mixed connection consisting of energy-consuming steel bars and unbonded prestressed bars, the vertical mixed connection mode has the advantages of less field grouting effect and convenient and rapid construction, and because the bottom joint of the embedded connecting steel bar section is provided with a section of steel bar non-bonding section, the obvious plastic deformation of the embedded connecting steel bar section caused by the opening of the bottom joint of the pier under the earthquake action is avoided, the prefabricated pier has good deformation capacity under the action of earthquake by means of opening of the joint, and good self-resetting capacity (capacity of restoring the position before the earthquake) is obtained by means of unbonded prestress after the earthquake.
4. The characteristics of the UHPC high-performance material are utilized to enhance the vulnerable area of the pier in the earthquake, and the irreparable earthquake damage is reduced: the advantages of the UHPC material with high strength and high ductility are fully exerted, the easily damaged areas of the pier under the earthquake action, such as the contact area of the bearing platform and the prefabricated pier bottom section, the bottom area of the prefabricated pier bottom section, the connecting beam area and the pier area between the prefabricated pier section and the prefabricated connecting beam, and the like, are locally reinforced by adopting the UHPC to reduce the irreparable earthquake damage, so that the pier is guaranteed to be damaged only by replaceable damage elements under the earthquake action.
5. Removable damage unit can full play energy consumption effect and easily change the restoration after shaking: the angle steel (replaceable damage element) is arranged between the connecting beam and the bridge pier, the connecting part of the connecting beam and the bridge pier is easy to relatively deform under the action of lateral force according to a lateral deformation mechanism of a coupled structure, the connecting beam and the bridge pier are connected by adopting unbonded prestressed tendons, so that the relative deformation between the connecting beam and the bridge pier is more sufficient under the action of an earthquake, and the angle steel is made of soft steel with a low yield point, so that the replaceable damage element can fully play a role in energy consumption under the action of the earthquake; simultaneously, the angle steel is fixed by mechanical connection, and the connecting bolt, the connecting steel cover plate and the connecting nut are made of high-strength steel to ensure that the elasticity is always kept under the action of an earthquake, so that the damage angle steel can be quickly replaced after the earthquake.
Drawings
FIG. 1 is a front view of an embodiment of the present invention;
FIG. 2 is a side view of an embodiment of the present invention;
FIG. 3 is a top view of an embodiment of the present invention;
FIG. 4 is a front view of a platform according to an embodiment of the present invention;
FIG. 5 is a side view of a platform according to an embodiment of the present invention;
FIG. 6 is a top view of a platform according to an embodiment of the present invention;
FIG. 7 is an elevation view of a prefabricated pier base section according to an embodiment of the present invention;
FIG. 8 is a side view of a prefabricated pier base section according to an embodiment of the present invention;
FIG. 9 is a top view of a prefabricated pier base section according to an embodiment of the present invention;
fig. 10 is a front view of a precast pier-coupling beam module according to an embodiment of the present invention;
fig. 11 is a side view of a precast pier-girder block according to an embodiment of the present invention;
fig. 12 is a plan view of a precast pier-coupling beam module according to an embodiment of the present invention;
fig. 13 is a sectional view taken along line a-a of a prefabricated pier-coupling girder module according to an embodiment of the present invention (see fig. 12 for a section along line a-a);
fig. 14 is a B-B sectional view of a prefabricated pier-coupling girder block according to an embodiment of the present invention (see fig. 12 for a B-B section);
FIG. 15 is an elevation view of a prefabricated lightweight capping beam according to an embodiment of the present invention;
FIG. 16 is a side view of a prefabricated lightweight capping beam according to an embodiment of the present invention;
fig. 17 is a top view of a prefabricated lightweight capping beam according to an embodiment of the present invention.
The reference numbers in the figures illustrate:
1-bearing platform, 1.1-contact area of bearing platform and prefabricated bridge pier bottom segment;
2-prefabricating a pier bottom section, 2.1-prefabricating a bottom area of the pier bottom section;
3-prefabricating a pier-connecting beam module, 3.1-prefabricating a pier section, 3.2-prefabricating a connecting beam, 3.3-angle steel, 3.4-connecting bolts, 3.5-connecting steel cover plates, 3.6-connecting nuts, 3.7-a connecting beam area in contact between the prefabricated pier section and the prefabricated connecting beam, and 3.8-a pier area in contact between the prefabricated pier section and the prefabricated connecting beam;
4-prefabricating a light cover beam;
5-unbonded prestressed steel strands, 5.1-pipelines of the unbonded prestressed steel strands, 5.2-steel backing plates of the unbonded prestressed steel strands and 5.3-clamps of the unbonded prestressed steel strands;
6-connecting steel bars, 6.1-embedded connecting steel bar sections in a bearing platform, 6.2-embedded connecting steel bar sections in a prefabricated bridge pier bottom section, 6.3-prefabricated bridge pier-connecting beam modules and prefabricated light cover beam inner connecting steel bar sections, 6.4-semi-grouting sleeves, 6.5-mechanical sleeves, 6.6-embedded corrugated pipes, 6.7-on-site post-poured grouting materials and 6.8-steel bar unbonded sections at bottom joints.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As shown in fig. 1-17, a self-resetting prefabricated two-way coupled high-speed railway pier with local UHPC recoverable function comprises a bearing platform 1 and a cover beam supported above the bearing platform 1 through a vertical supporting structure. Wherein, 4 vertical supporting structures are arranged on the bearing platform 1 in an array in the embodiment, and the capping beams are prefabricated members, in particular prefabricated light capping beams 4; the vertical supporting structure comprises a prefabricated bridge pier bottom section 2, a prefabricated bridge pier-connecting beam section 3 and unbonded prestressed steel strands 5; the prefabricated pier bottom sections 2 are fixed on the bearing platform 1 in a matrix arrangement shape; the top surface of the prefabricated bridge pier bottom section 2 is provided with a prefabricated bridge pier-connecting beam section 3; the prefabricated pier-connecting beam sections 3 comprise prefabricated pier sections 3.1 and prefabricated connecting beams 3.2; the prefabricated pier segment 3.1 is fixed at the top end of the prefabricated pier bottom segment 2 along the extension line of the middle line of the prefabricated pier bottom segment 2; prefabricated connecting beams 3.2 are transversely arranged between the adjacent prefabricated pier sections 3.1, and the prefabricated connecting beams 3.2 are fixedly connected to the side surfaces of the prefabricated pier sections 3.1; pipelines allowing the unbonded prestressed steel strands 5 to transversely penetrate through are reserved in the prefabricated connecting beam 3.2 and the prefabricated pier sections 3.1, and the unbonded prestressed steel strands 5 transversely penetrate through and are connected with the prefabricated connecting beam 3.2 and the prefabricated pier sections 3.1; the longitudinal section of the joint of the prefabricated pier section 3.1 and the prefabricated connecting beam 3.2 is L-shaped; the connection part of the prefabricated pier section 3.1 and the prefabricated connecting beam 3.2 is fixedly connected through angle steel 3.3, a connecting bolt 3.4 and a connecting nut 3.6; the angle steel 3.3 is attached to the joint of the prefabricated connecting beam 3.2 and the prefabricated pier section 3.1, and the angle steel 3.3 is fixed at the joint of the prefabricated connecting beam 3.2 and the prefabricated pier section 3.1 through a connecting bolt 3.4 and a connecting nut 3.6; the contact area of the bearing platform and the prefabricated bridge pier bottom section, the bottom area of the prefabricated bridge pier bottom section, the connecting beam area and the bridge pier area which are in contact between the prefabricated bridge pier section and the prefabricated connecting beam and the like which are easy to damage under the action of earthquake are all made of UHPC; only the angle steel is subjected to elastic-plastic deformation under the action of an earthquake to consume energy through design, and after the earthquake, the damaged angle steel is replaced, so that the function of the whole pier after the earthquake is quickly recovered; the cushion cap in the bottom seam crossing of pre-buried connecting reinforcement 6.1 be equipped with one section unbonded section for avoid the pier to cause pre-buried connecting reinforcement to take place obvious plastic deformation when opening in the bottom seam crossing of earthquake effect, through the ability from restoring to the throne that unbonded prestress wire provided after the earthquake, resume whole pier to the position before the earthquake. By utilizing the structural form, the structural rigidity requirement and the rapid construction requirement can be considered, the shearing state of the pier can be improved, the pier can be ensured to have good deformation capacity under the earthquake action, only the replaceable damage element is damaged, the prefabricated high-speed rail pier is further developed into a post-earthquake function recoverable structure, and the toughness and earthquake-resistant requirement is met.
Wherein, this high-speed railway pier still includes connecting reinforcement 6, connecting reinforcement 6 has laid a plurality of roots along prefabricated pier base section 2 vertically, connecting reinforcement 6 is close to prefabricated pier base section 2's edge and is the matrix arrangement, connecting reinforcement 6 vertically runs through connection cushion cap 1, prefabricated pier base section 2, prefabricated pier section 3.1 and prefabricated light-duty bent cap 4.
The connecting steel bars 6 consist of connecting steel bars 6.1 pre-embedded in the bearing platform 1, connecting steel bars 6.2 pre-embedded in the precast bridge pier bottom section 2, precast bridge pier-connecting beam modules 3 and connecting steel bars 6.3 in the precast light cover beams 4; the embedded connecting steel bars 6.1 in the bearing platform 1 are connected with the embedded connecting steel bars 6.2 in the prefabricated bridge pier bottom section 2 through a half-grouting sleeve, and the embedded connecting steel bars 6.2 in the prefabricated bridge pier bottom section 2 are connected with the prefabricated bridge pier-connecting beam module 3 and the prefabricated light cover beam 4 internal connecting steel bars 6.3 through mechanical sleeves; the precast pier sections and the pre-buried steel bars (6.3) in the bent cap are anchored in the precast pier sections and the bent cap by grouting corrugated pipe connection technology; the semi-grouting sleeve 6.4 and the mechanical sleeve 6.5 are used for connecting or anchoring the connecting steel bars 6, and the pre-buried corrugated pipe 6.6 has enough connecting or anchoring length, so that the connecting steel bars 6 can be ensured to fully play a role.
The bottom seam crossing of pre-buried connecting reinforcement 6.1 is equipped with unbonded section 6.8 in cushion cap 1, and the bottom seam crossing is equipped with unbonded section 6.8, and the calculation of bottom seam crossing unbonded section 6.8 length accessible confirms, guarantees under seismic action angle steel 3.3 and destroys preceding pre-buried connecting reinforcement 6.1 and can not take place to open and take place obvious plastic deformation because of the seam crossing of going to the bottom of seismic action, through the self-reset ability that unbonded prestress wire 5 provided after the earthquake, resumes whole pier to the position before the earthquake.
Wherein, this high-speed railway pier still includes along the vertical non-adhesive prestress steel strand of a plurality of that runs through fixed connection prefabricated light-duty bent cap 4 of high-speed railway pier, prefabricated pier-even roof beam module 3, prefabricated pier base segment 2 and cushion cap 1, the vertical non-adhesive prestress steel strand of a plurality of is parallel to each other with connecting reinforcement 6, the vertical non-adhesive prestress steel strand of a plurality of is close to prefabricated pier base segment 2's central evenly distributed.
The connecting part of the prefabricated pier section 3.1 and the prefabricated connecting beam 3.2 is further provided with a steel cover plate 3.5, the connecting steel cover plate 3.5 is arranged between angle steel 3.3 and connecting nuts 3.6, the connecting bolts 3.4, the connecting nuts 3.6 and the steel cover plate 3.5 are matched with and fixedly connected with the angle steel 3.3, the prefabricated connecting beam 3.2 and the prefabricated pier section 3.1, the steel cover plate 3.5 can enhance the connecting rigidity between the prefabricated connecting beam 3.2 and the prefabricated pier section 3.1, the angle steel 3.3 is made of soft steel with low yield point, the connecting bolts 3.4, the connecting steel cover plate 3.5 and the connecting nuts 3.6 are made of high-strength steel, the connecting bolts 3.4 have enough embedded length or embedded measures in the prefabricated pier section 3.1 and the prefabricated connecting beam 3.2, and the connecting bolts 3.4, the connecting steel cover plate 3.5 and the connecting nuts 3.6 are still in the elastic state, and the connecting bolts still have good anchoring effect of anchoring in the pier section 3.3.3.3 and the prefabricated pier section 3.2, thereby realizing the quick replacement of the damaged angle steel 3.3 after the earthquake.
According to the UHPC local enhancement restorable function self-resetting prefabricated bidirectional coupled high-speed rail bridge pier, the construction method of the UHPC local enhancement restorable function self-resetting prefabricated bidirectional coupled high-speed rail bridge pier comprises the following steps:
step 1, assembling prefabricated pier-coupling beam sections 3 in a prefabrication plant: the prefabricated pier-connecting beam segment 3 comprises a prefabricated pier segment 3.1, a prefabricated connecting beam 3.2, angle steel 3.3, a steel cover plate 3.5, a connecting nut 3.5 and connecting bolts 3.4 which are respectively embedded in the prefabricated pier segment 3.1 and the prefabricated connecting beam 3.2, when the prefabricated pier-connecting beam segment 3 is assembled, the unbonded prestressed steel stranded wires 5 transversely penetrate through the prefabricated pier segment 3.1 and the prefabricated connecting beam 3.2 and are tensioned to stretch the unbonded prestressed steel stranded wires 5, and then the angle steel 3.3 and the steel cover plate 3.5 are fixedly arranged at the connecting part of the prefabricated pier segment 3.1 and the prefabricated connecting beam 3.2 through the connecting nut 3.5 and the connecting bolt 3.4, so that the earthquake relief angle steel 3.3 is easy to replace;
and 6, leading out unbonded prestressed steel strands 5 from the pipeline of the unbonded prestressed steel strands in the prefabricated light capping beam 4, and permanently applying prestress on the whole prefabricated high-speed rail pier by using a steel base plate 5.2 and a clamp 5.3 of the unbonded prestressed steel strands so as to finish the installation work of the whole prefabricated high-speed rail pier.
The concrete implementation process of the post-earthquake restoration method comprises the following steps:
and (3) unscrewing the connecting nut 3.6 on the prefabricated pier-connecting beam module 3, taking down the steel cover plate 3.5 and the damaged angle steel 3.3, and then fixing a new angle steel 3.3 between the prefabricated pier section 3.1 and the prefabricated connecting beam 3.2 again by using the steel cover plate 3.5 and the connecting nut 3.6, so as to finish the post-earthquake repairing work of the whole prefabricated high-speed railway pier.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (10)
1. The utility model provides a local UHPC recoverable function is from prefabricated two-way allies oneself with limb high-speed railway pier that restores to throne which characterized in that: including cushion cap (1) and through the bent cap of vertical bearing structure support in cushion cap (1) top, its characterized in that: the cover beam is a prefabricated part;
the vertical supporting structure comprises a prefabricated bridge pier bottom section (2), a prefabricated bridge pier-connecting beam section (3) and unbonded prestressed steel strands (5);
the prefabricated pier bottom sections (2) are fixed on the bearing platform (1) in a matrix arrangement shape;
the top surface of the prefabricated bridge pier bottom segment (2) is provided with a prefabricated bridge pier-connecting beam segment (3);
the prefabricated pier-connecting beam segment (3) comprises a prefabricated pier segment (3.1) and a prefabricated connecting beam (3.2);
the prefabricated pier segment (3.1) is fixed at the top end of the prefabricated pier bottom segment (2) along the extension line of the middle line of the prefabricated pier bottom segment (2);
prefabricated connecting beams (3.2) are transversely arranged between the adjacent prefabricated pier sections (3.1), and the prefabricated connecting beams (3.2) are fixedly connected to the side surfaces of the prefabricated pier sections (3.1);
pipelines allowing the unbonded prestressed steel strands (5) to transversely penetrate through are reserved in the prefabricated connecting beam (3.2) and the prefabricated pier sections (3.1), and the unbonded prestressed steel strands (5) transversely penetrate through and are connected with the prefabricated connecting beam (3.2) and the prefabricated pier sections (3.1);
the longitudinal section of the joint of the prefabricated pier segment (3.1) and the prefabricated connecting beam (3.2) is L-shaped;
the connection part of the prefabricated pier segment (3.1) and the prefabricated connecting beam (3.2) is fixedly connected through angle steel (3.3), a connecting bolt (3.4) and a connecting nut (3.6); the angle steel (3.3) is attached to the joint of the prefabricated connecting beam (3.2) and the prefabricated pier segment (3.1), and the angle steel (3.3) is fixed at the joint of the prefabricated connecting beam (3.2) and the prefabricated pier segment (3.1) through a connecting bolt (3.4) and a connecting nut (3.6).
2. The local UHPC recoverable function self-resetting prefabricated bidirectional coupled high-speed rail pier of claim 1, which is characterized in that: the prefabricated bridge pier is characterized in that the contact area of the bearing platform (1) and the prefabricated bridge pier bottom section (2), the bottom area of the prefabricated bridge pier bottom section (2), the bridge pier area in the prefabricated bridge pier section (3.1) and in contact with the prefabricated connecting beam, and the connecting beam area in the prefabricated connecting beam (3.2) and in contact with the prefabricated connecting beam are all made of ultrahigh-performance concrete.
3. The local UHPC recoverable function self-resetting prefabricated bidirectional coupled high-speed rail pier of claim 1, which is characterized in that: still include connecting reinforcement (6), a plurality of roots have been laid along the vertical of prefabricated pier base section (2) in connecting reinforcement (6), connecting reinforcement (6) are close to the edge of prefabricated pier base section (2) and are the matrix arrangement, connecting reinforcement (6) are vertically through connection cushion cap (1), prefabricated pier base section (2), prefabricated pier section (3.1) and bent cap.
4. The local UHPC recoverable function self-resetting prefabricated bidirectional coupled high-speed rail pier of claim 3, which is characterized in that: inside connecting reinforcement (6) matrix, still be equipped with a plurality of unbonded prestress steel strands (5) that are parallel to each other with connecting reinforcement (6), a plurality of unbonded prestress steel strands (5) are through vertical through connection cushion cap (1), prefabricated pier base segment (2), prefabricated pier segment (3.1) and bent cap of pre-buried pipeline.
5. The local UHPC recoverable function self-resetting prefabricated bidirectional coupled high-speed rail pier of claim 1, which is characterized in that: prefabricated pier segment (3.1) still has laid steel apron (3.5) with the junction of prefabricated even roof beam (3.2), connection steel apron (3.5) are laid between angle steel (3.3) and coupling nut (3.6), coupling bolt (3.4), coupling nut (3.6) and steel apron (3.5) cooperation fixed connection angle steel (3.3), prefabricated even roof beam (3.2) and prefabricated pier segment (3.1).
6. The local UHPC recoverable function self-resetting prefabricated bidirectional coupled high-speed rail pier of claim 3, which is characterized in that: the connecting steel bars (6) comprise embedded steel bars (6.1) in the bearing platform, embedded steel bars (6.2) in the prefabricated bridge pier bottom sections, prefabricated bridge pier sections and embedded steel bars (6.3) in the bent caps;
through half grout muffjoint between embedded steel bar (6.1) in the cushion cap and the prefabricated pier base segment embedded steel bar (6.2), embedded steel bar (6.2) passes through mechanical muffjoint with embedded steel bar (6.3) in prefabricated pier base segment and the bent cap in the prefabricated pier base segment, and embedded steel bar (6.3) is in prefabricated pier segment and the bent cap through grouting corrugated pipe connection technology anchor in prefabricated pier segment and bent cap.
7. The UHPC locally-enhanced recoverable function self-resetting prefabricated bidirectional coupled high-speed rail pier of claim 6, which is characterized in that: and an unbonded section is arranged at the bottom joint of the embedded steel bar (6.1) in the bearing platform.
8. The UHPC locally-enhanced recoverable function self-resetting prefabricated bidirectional coupled high-speed rail pier of claim 1, which is characterized in that: 4 vertical supporting structures are arranged on the bearing platform (1) in an array mode.
9. The UHPC locally-enhanced recoverable function self-resetting prefabricated bidirectional coupled high-speed rail pier of claim 5, which is characterized in that: the angle steel (3.3) is made of mild steel, and the connecting bolt (3.4), the connecting steel cover plate (3.5) and the connecting nut (3.6) are made of high-strength steel.
10. The UHPC locally-enhanced recoverable function self-resetting prefabricated bidirectional coupled high-speed rail bridge pier disclosed by any one of claims 1 to 9 provides a construction method of the UHPC locally-enhanced recoverable function self-resetting prefabricated bidirectional coupled high-speed rail bridge pier, which is characterized in that: the method comprises the following steps:
step 1, assembling prefabricated pier-coupling beam sections (3) in a prefabrication plant: the prefabricated pier-connecting beam segment (3) comprises a prefabricated pier segment (3.1), a prefabricated connecting beam (3.2), angle steel (3.3), a steel cover plate (3.5), a connecting nut (3.5) and connecting bolts (3.4) which are respectively embedded in the prefabricated pier segment (3.1) and the prefabricated connecting beam (3.2), when the prefabricated pier-connecting beam segment (3) is assembled, unbonded prestressed steel strands (5) transversely penetrate through the prefabricated pier segment (3.1) and the prefabricated connecting beam (3.2) and stretch the unbonded prestressed steel strands (5), and then the angle steel (3.3) and the steel cover plate (3.5) are fixedly installed at the connecting part of the prefabricated pier segment (3.1) and the prefabricated connecting beam (3.2) through the connecting nuts (3.5) and the connecting bolts (3.4);
step 2, conveying each prefabricated part to a construction site;
step 3, installing the prefabricated pier bottom segment (2): respectively placing the prefabricated pier bottom sections (2) on a bearing platform (1), inserting pre-embedded connecting steel bars (6.1) and longitudinal unbonded prestressed steel strands (5) in the bearing platform (1) into the prefabricated pier bottom sections (2) and correcting, and performing field grouting treatment on the connecting steel bar sections between the prefabricated pier bottom sections (2) and the bearing platform (1);
step 4, mounting the prefabricated pier-coupling beam segment (3): pre-embedded connecting steel bars (6.2) in a prefabricated pier bottom section (2) are lengthened through a mechanical sleeve, a prefabricated pier section (3.1) in a prefabricated pier-connecting beam module (3) is hoisted and inserted on the lengthened connecting steel bars, the lengthened connecting steel bars (6.3) and unbonded prestressed steel strands (5) penetrate through the prefabricated pier section (3.1) along the longitudinal direction, and finally the connecting steel bar sections in the prefabricated pier section (3.1) are subjected to field grouting treatment;
step 5, mounting the prefabricated light cover beam (4): after all the prefabricated pier-coupling beam modules (3) and the prefabricated pier bottom sections (2) are fixedly installed, connecting steel bars (6) at the top ends of the prefabricated pier sections (3.1) are all inserted into the prefabricated light capping beams (4) and are corrected, unbonded prestressed steel strands (5) longitudinally penetrate through the prefabricated light capping beams (4), and field grouting treatment is carried out on the connecting steel bar (6) sections in the prefabricated light capping beams (4);
and 6, leading out unbonded prestressed steel strands (5) from the pipeline of the unbonded prestressed steel strands in the prefabricated light capping beam (4), and permanently applying prestress on the whole prefabricated high-speed rail pier so as to finish the installation work of the whole prefabricated high-speed rail pier.
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