CN105714674A - Pier energy-consuming and anti-crushing structure capable of replacing internal energy-consuming reinforcing steel bars of composite board - Google Patents
Pier energy-consuming and anti-crushing structure capable of replacing internal energy-consuming reinforcing steel bars of composite board Download PDFInfo
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- CN105714674A CN105714674A CN201610105894.XA CN201610105894A CN105714674A CN 105714674 A CN105714674 A CN 105714674A CN 201610105894 A CN201610105894 A CN 201610105894A CN 105714674 A CN105714674 A CN 105714674A
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- consuming
- uhpc
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- power consumption
- bridge pier
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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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Abstract
The invention discloses a pier energy-consuming and anti-crushing structure capable of replacing internal energy-consuming reinforcing steel bars of a composite board. The structure is characterized in that two UHPC plates are arranged on an easily-damaged area of a pier assembled by dry joint sections, namely at each of four sides of a pier bottom section; pre-stress is applied by a fine-rolled thread reinforcing bar, so that the UHPC plates are combined with the bottom section to form an integer; hollow passages are reserved between the two UHPC plates, and are used for placing the energy-consuming reinforcing steel bars. According to the pier energy-consuming and anti-crushing structure, the UHPC plates have the property of cracking but not crushing due to the fact that steel fibers are mixed in, so that the inner bottom section is prevented from being crushed under excitation of seismic action; the energy-consuming reinforcing steel bars in the hollow passages are prevented from rusting by utilizing the compact property of the UHPC structures; meanwhile, the UHPC plates around the hollow passages can prevent the energy-consuming reinforcing steel bars from buckling failure while stressed; the energy-consuming reinforcing steel bars are used for improving energy-consuming capacity, under the excitation of seismic action, of the pier assembled by the dry joint sections, so that the pier is guaranteed to have good energy-consuming capacity and can prevent the bottom section from being severely crushed under the excitation of seismic action; and moreover, quick repair on the pier is realized by replacing the UHPC plates and the energy-consuming reinforcing steel bars after an earthquake.
Description
Technical field
The present invention relates to middle highly seismic region bridge rapid construction technology and Seismic Design Method, particularly to section assembling technology, external prestressing technique with utilize the damper technology that metal material consumes energy, belong to field of civil engineering.
Background technology
Stem grafting seam section assembling bridge pier, because having advantage and the self-resetting capability of rapid construction, obtains engineer applied in some including port Zhuhai and Macao bridge and Canadian Federal bridge in the bridge spanning the sea of river.The bridge pier of this form is that pier shaft is vertically divided into some sections, Reinforcement disconnects at segmental joints place, " stem grafting seam " is adopted to connect between sections, or the durability of bridge pier is improved at seam crossing filling epoxy resin, then adopt the mode of post-tensioned prestressing that sections is connected into entirety.Chinese scholars is found by experimental and theoretical study, and stem grafting seam section assembling bridge pier energy dissipation capacity under seismic stimulation is poor, and easily crushes in coxopodite section.
For improving the energy dissipation capacity of stem grafting seam section assembling bridge pier, the method employed up in engineering practice and scientific research at present is to stitch built-in power consumption reinforcing bar in section assembling bridge pier at stem grafting.Although this method can improve the energy dissipation capacity of bridge pier, but can cause that the residual deformation of shake rear abutment increases simultaneously, simultaneously built-in power consumption reinforcing bar is not easy to change after shake.
For stem grafting stitch section assembling bridge pier seismic stimulation go to the bottom sections hold squashy problem, applying maximum methods in engineering is that coxopodite section concrete is increased constraint to improve concrete deformability, including increasing stirrup consumption in coxopodite section concrete, using concrete filled steel tube to make coxopodite section or at coxopodite section concrete outer wrap FRP, this method can actually alleviate coxopodite section degree of injury under seismic stimulation, but the concrete of damage there is also shake after not easily changeable problem.
Summary of the invention
Technical problem: it is an object of the invention to provide the power consumption of the bridge pier of a kind of replaceable composite plate built-in power consumption reinforcing bar and anti-crushed structure, utilize replaceable ultra-high performance concrete (UltraHighPerformanceConcrete, UHPC) the built-in power consumption reinforcing bar of plate improves stem grafting seam section assembling bridge pier energy dissipation capacity under geological process encourages and prevents coxopodite section from crushing, this structure is used to be possible not only to improve stem grafting seam section assembling bridge pier energy dissipation capacity and prevent coxopodite section from crushing under seismic stimulation, and can quickly repair impaired bridge pier by changing impaired UHPC plate and wherein built-in power consumption reinforcing bar after shake, recover the use function of bridge in time.
Technical scheme: the present invention is the bridge pier power consumption of a kind of replaceable composite plate built-in power consumption reinforcing bar and anti-crushed structure, respectively arranges two blocks of UHPC plates being superimposed on bridge pier coxopodite section four limit, and between two blocks of UHPC plates, reserving hole channel is used for placing power consumption reinforcing bar；Finish rolling deformed bar is through described UHPC plate and bridge pier coxopodite section, and the two ends of finish rolling deformed bar are by high-strength nut and steel plate washer anchoring, and described UHPC plate and bridge pier coxopodite section combine both into entirety by finish rolling deformed bar Shi Hanzhang；Described power consumption reinforcing bar is connected with the embedded bar of upper segment and the embedded bar of cushion cap respectively by threaded steel bushing；Need to arrange rubber spacer between described bridge pier coxopodite section and UHPC plate and upper segment, it is prevented that owing to the collision of coxopodite section causes upper segment to damage under geological process encourages, upper segment, to increase wall thickness with coxopodite section seam crossing, is gradually reduced to wall thickness.
Described reserving hole channel diameter is slightly larger than the diameter of power consumption reinforcing bar.
Described UHPC plate uses the UHPC mixing micro steel fiber to make,
Beneficial effect: the present invention contrasts prior art and has the advantage that
1. this invention adopts capacity protection principle to be easily separated with protected district by vulnerable zone; utilize finish rolling deformed bar Shi Hanzhang using integral with the inner bottom sections as protected district for the UHPC plate as vulnerable zone; loosening and stretch-draw again of finish rolling deformed bar can be passed through, it is achieved the quick-replaceable to impaired UHPC plate after shake.
2. vulnerable zone adopts UHPC plate, it is possible to the character of " split and not broken " that make full use of that UHPC has because of mixing of steel fiber and the corrosion resistant character having because structure is closely knit.
3. it is respectively provided with two blocks of replaceable UHPC plates on bridge pier coxopodite section four limit, reserving hole channel for placing power consumption reinforcing bar is arranged between two blocks of UHPC plates, power consumption reinforcing bar is observed and is changed after not only improving shake by such way, being also beneficial to prevent power consumption steel bar corrosion, the UHPC around duct can prevent from, during power consumption reinforcing bar pressurized, buckling failure occurs simultaneously.
4. the diameter of power consumption reinforcing bar to be slightly smaller than the diameter of reserving hole channel, the upper and lower end of power consumption reinforcing bar is connected with the embedded bar of upper segment and cushion cap respectively by steel bushing, after not only improving shake, power consumption reinforcing bar is replaced, also ensure that power consumption reinforcing bar can Free Transform under geological process encourages.
5. need to arrange rubber spacer between stem grafting seam section assembling bridge pier coxopodite section and UHPC plate and upper segment, prevent under geological process excitation owing to the collision of coxopodite section causes upper segment to damage, this ensures that there the contingent damage of bridge pier and only concentrate on removable UHPC plate, recover the use function of bridge after being conducive to shake in time, gain time for earthquake relief work.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention structural section；
Fig. 2 is embodiment of the present invention structure top view；
Number in the figure illustrates: 1-bridge pier coxopodite section, 2-UHPC plate, 3-reserving hole, 4-power consumption reinforcing bar, 5-finish rolling deformed bar, 6-high-strength nut, 7-steel plate washer, 8-steel bushing, 9-upper segment, 10-embedded bar and 11-rubber spacer.
Detailed description of the invention
The present invention is a kind of by utilizing the built-in power consumption reinforcing bar of replaceable UHPC plate to improve stem grafting seam section assembling bridge pier energy dissipation capacity under geological process encourages and the structure preventing coxopodite section from crushing, and this structure needs to use replaceable UHPC plate, power consumption reinforcing bar, finish rolling deformed bar, high-strength nut, steel plate washer, steel bushing, embedded bar and rubber spacer.
Described replaceable UHPC plate is respectively provided with two pieces on bridge pier coxopodite section four limit, and reserving hole channel between two blocks of UHPC plates is used for placing power consumption reinforcing bar, and described duct is symmetric with bridge pier center.
Described replaceable UHPC plate and inner bottom sections are combined into entirety by finish rolling deformed bar Shi Hanzhang, by calculating the thickness obtaining replaceable UHPC plate, UHPC is utilized to have the character of " splitting and not broken " because of mixing of steel fiber, after ensureing shake, replaceable UHPC plate only occurs local damage occurrence of large-area to crush, inner bottom sections still remains intact simultaneously, enough support top dead load and connect different segment institute Shi Hanzhang, can quick-recovery bridge pier soon by changing UHPC plate after shaking.
Described power consumption bar diameter is slightly smaller than the diameter in duct, the upper and lower end wherein consuming reinforcing bar is connected with the embedded bar of upper segment and cushion cap respectively by steel bushing, stem grafting seam section assembling bridge pier can wave in the horizontal direction under geological process encourages, make power consumption reinforcing bar be subject to tension and compression repeatedly and elastic-plastic deformation occurs, reach the purpose of power consumption.Wherein the UHPC around reserving hole channel plays the effect preventing power consumption reinforcing bar generation buckling failure, and channel diameter is a bit larger tham power consumption bar diameter, is reserved certain space for power consumption reinforcing bar by compression swelling.
The described duct in replaceable UHPC plate and power consumption reinforcing bar are 20, every 5.
Need to arrange rubber spacer between stem grafting seam section assembling bridge pier coxopodite section and UHPC plate and upper segment, it is prevented that owing to the collision of coxopodite section causes upper segment to damage under geological process excitation.Upper segment is to increase wall thickness with coxopodite section seam crossing simultaneously, is gradually reduced to wall thickness, and when changing UHPC plate successively after so can ensure that shake, bridge pier remains to effectively top dead load and prestressing force be passed to cushion cap.
The invention provides a kind of by utilizing the built-in power consumption reinforcing bar of replaceable UHPC plate to improve stem grafting seam section assembling bridge pier energy dissipation capacity under geological process encourages and the structure (such as Fig. 1) preventing coxopodite section from crushing, this structure relates to bridge pier coxopodite section 1, UHPC plate 2, reserving hole 3, power consumption reinforcing bar 4, finish rolling deformed bar 5, high-strength nut 6, steel plate washer 7, steel bushing 8, upper segment 9, embedded bar 10 and rubber spacer 11.The described duct in replaceable UHPC plate and power consumption reinforcing bar are 20.
The process that the present invention is embodied as is as follows:
Step 1: stem grafting is stitched each sections of section assembling bridge pier and is transported to job site from precast plant, each sections vertically place in order on cushion cap errorless after, upper segment 9 bottom surface has bondd rubber spacer 11, by post-tensioned prestressing, each sections is connected into entirety；
Step 2: be sequentially placed one block of UHPC plate 2 (such as Fig. 2) on bridge pier coxopodite section 1 four limit；
Step 3: power consumption reinforcing bar 4 is placed on the groove of UHPC plate 2, and is connected with the embedded bar 10 in upper segment 9 and cushion cap respectively by steel bushing 8；
Step 4: be sequentially placed another block UHPC plate 2 (such as Fig. 2) on bridge pier coxopodite section 1 four limit, two blocks of UHPC plates 2 align at reserving hole channel 3 place, and now power consumption reinforcing bar 4 is just in reserving hole channel 3；
Step 5: by finish rolling deformed bar 5 through the duct being reserved on bridge pier coxopodite section 1 and UHPC plate 2, according to regulation about stretch-draw finish rolling deformed bar 5 in " highway bridge and culvert construction technique normalizing " (JTG/TF50-2011), utilize relevant device to finish rolling deformed bar 5 Shi Hanzhang, and use high-strength nut 6 and steel plate washer 7 to its anchoring.
In the present embodiment, the UHPC plate 2 described in step 2 is made by the UHPC mixing micro steel fiber, and UHPC plate 2 thickness is obtained by calculating, to ensure that inner bottom sections 1 does not occur damage for calculating principle.
In the present embodiment, in UHPC plate 2 described in step 3, reserving hole channel 3 and power consumption reinforcing bar 4 are 20, reserving hole channel 3 diameter is slightly larger than the diameter of power consumption reinforcing bar 4, when stem grafting stitches the occurred level deformation under geological process encourages of section assembling bridge pier, whole power consumption reinforcing bar 4 can Free Transform, give full play to energy dissipation capacity.
Although as it has been described above, represented and described the present invention with reference to specific preferred embodiment, but it shall not be construed as the restriction to the present invention self.Under the spirit and scope of the present invention premise defined without departing from claims, it can be made a variety of changes in the form and details.
Claims (3)
1. the bridge pier of a replaceable composite plate built-in power consumption reinforcing bar consumes energy and anti-crushed structure, it is characterized in that, this structure respectively arranges two blocks of UHPC plates (2) being superimposed on bridge pier coxopodite section (1) four limit, and between two pieces of UHPC plates (2), reserving hole channel (3) is used for placing power consumption reinforcing bar (4)；Finish rolling deformed bar (5) the described UHPC plate (2) of traverse and bridge pier coxopodite section (1), the two ends of finish rolling deformed bar (5) are by high-strength nut (6) and steel plate washer (7) anchoring, and described UHPC plate (2) and bridge pier coxopodite section (1) combine both into entirety by finish rolling deformed bar (5) Shi Hanzhang；Described power consumption reinforcing bar (4) is connected with the embedded bar (10) of the embedded bar of upper segment (9) and cushion cap respectively by threaded steel bushing (8)；Need to arrange rubber spacer (11) between described bridge pier coxopodite section (1) and UHPC plate (2) and upper segment (9), prevent under geological process encourages owing to the collision of coxopodite section (1) causes upper segment (9) to damage, upper segment (9), to increase wall thickness with coxopodite section (1) seam crossing, is gradually reduced to wall thickness.
2. the bridge pier of replaceable composite plate according to claim 1 built-in power consumption reinforcing bar consumes energy and anti-crushed structure, it is characterised in that described reserving hole channel (3) diameter is slightly larger than the diameter of power consumption reinforcing bar (4).
3. the bridge pier of replaceable composite plate according to claim 1 built-in power consumption reinforcing bar consumes energy and anti-crushed structure, it is characterised in that described UHPC plate (2) uses the UHPC mixing micro steel fiber to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610105894.XA CN105714674B (en) | 2016-02-26 | 2016-02-26 | The bridge pier power consumption of the replaceable built-in power consumption reinforcing bar of composite plate and anti-crushed structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610105894.XA CN105714674B (en) | 2016-02-26 | 2016-02-26 | The bridge pier power consumption of the replaceable built-in power consumption reinforcing bar of composite plate and anti-crushed structure |
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| CN105714674A true CN105714674A (en) | 2016-06-29 |
| CN105714674B CN105714674B (en) | 2017-06-16 |
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Cited By (4)
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| CN107059599A (en) * | 2017-04-27 | 2017-08-18 | 北京市市政工程设计研究总院有限公司 | Antidetonation without bearing Self-resetting, damping cast-in-situ bridge |
| CN107974933A (en) * | 2017-07-06 | 2018-05-01 | 东南大学 | The precast assembly bridge pier anti-seismic structure and its construction method of built-in replaceable viscous damper and energy consumption reinforcing bar |
| CN108385837A (en) * | 2018-05-09 | 2018-08-10 | 华侨大学 | The energy dissipation brace of replaceable energy-consuming parts is arranged in a kind of both ends |
| CN114592422A (en) * | 2022-03-15 | 2022-06-07 | 广西交科集团有限公司 | Self-resetting detachable and replaceable assembled anti-seismic pier and construction method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107059599A (en) * | 2017-04-27 | 2017-08-18 | 北京市市政工程设计研究总院有限公司 | Antidetonation without bearing Self-resetting, damping cast-in-situ bridge |
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| CN107974933B (en) * | 2017-07-06 | 2019-07-23 | 东南大学 | The precast assembly bridge pier anti-seismic structure and its construction method of built-in replaceable viscous damper and energy consumption reinforcing bar |
| CN108385837A (en) * | 2018-05-09 | 2018-08-10 | 华侨大学 | The energy dissipation brace of replaceable energy-consuming parts is arranged in a kind of both ends |
| CN114592422A (en) * | 2022-03-15 | 2022-06-07 | 广西交科集团有限公司 | Self-resetting detachable and replaceable assembled anti-seismic pier and construction method thereof |
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| CN105714674B (en) | 2017-06-16 |
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