CN105735109A - Pier energy dissipation and anti-crushing structure internally provided with steel bar dampers and viscous-elastic material - Google Patents
Pier energy dissipation and anti-crushing structure internally provided with steel bar dampers and viscous-elastic material Download PDFInfo
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- CN105735109A CN105735109A CN201610107166.2A CN201610107166A CN105735109A CN 105735109 A CN105735109 A CN 105735109A CN 201610107166 A CN201610107166 A CN 201610107166A CN 105735109 A CN105735109 A CN 105735109A
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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 dissipation and anti-crushing structure internally provided with steel bar dampers and a viscous-elastic material. According to the structure, each of the four edges of a vulnerable region, namely the bottom section of a dry joint section spliced pier is provided with two UHPC boards, a viscous-elastic material layer is arranged between the bottom section of the pier and each UHPC board, prestress is applied through finish rolled threaded reinforcing steel bars to combine the UHPC boards and the bottom section into a whole, and a hole channel is reserved between every two adjacent UHPC boards and used for containing the corresponding steel bar damper composed of a flexible steel core bar and a round steel casing pipe. The steel bar dampers in the hole channels are prevented from being rusted by the utilization of the character that the UHPC structure is compact, and the steel bar dampers and the viscous-elastic material layers are used for improving the energy dissipation capacity of the pier under excitation of an earthquake effect. The pier energy dissipation and anti-crushing structure is used for treating the dry joint section spliced pier, it can be guaranteed that the pier is good in energy dissipation capacity under excitation of the earthquake effect, the bottom section is prevented from being severely crushed, and the pier can be rapidly repaired by replacement of the UHPC boards, the steel bar dampers and the viscous-elastic material layers 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 built-in rod iron antivibrator and viscoelastic material and anti-crushed structure, utilize the built-in rod iron antivibrator of replaceable UHPC plate and viscoelastic material layer to improve stem grafting seam section assembling bridge pier energy dissipation capacity under geological process encourages and to prevent 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 pass through after shake, change impaired ultra-high performance concrete UHPC (UltraHighPerformanceConcrete, UHPC) impaired bridge pier quickly repaired by plate and wherein built-in rod iron antivibrator and viscoelastic material layer, recover the use function of bridge in time.
Technical scheme: the present invention is the bridge pier power consumption of a kind of built-in rod iron antivibrator and viscoelastic material and anti-crushed structure, utilize the built-in rod iron antivibrator of replaceable UHPC plate and viscoelastic material layer to improve stem grafting seam section assembling bridge pier energy dissipation capacity under geological process encourages and to prevent coxopodite section from crushing, this structure respectively arranges two blocks of UHPC plates being superimposed in the outside on bridge pier coxopodite section four limit, outside bridge pier coxopodite section and between UHPC plate, viscoelastic material layer is set, between the UHPC plate that two pieces are superimposed, reserving hole channel is for placing the rod iron antivibrator being made up of mild steel plug and circular steel jacketing；Finish rolling deformed bar is horizontally through described UHPC plate and bridge pier coxopodite section, and described UHPC plate and bridge pier coxopodite section, by high-strength nut and steel plate washer anchoring, are combined into entirety by finish rolling deformed bar Shi Hanzhang by the two ends of finish rolling deformed bar；Described mild steel plug is connected with the embedded bar of upper segment and 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 circle property steel thimble.
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. viscoelastic material is set between bridge pier coxopodite section and UHPC plate, ensure, under geological process encourages, less relative displacement only occurs between bridge pier coxopodite section and UHPC plate by calculating, utilize the operation principle that can consume energy during viscoelastic material generation detrusion, increase the energy dissipation capacity of bridge pier.
4. it is respectively provided with two blocks of replaceable UHPC plates on bridge pier coxopodite section four limit, reserving hole channel for placing rod iron antivibrator is arranged between two blocks of UHPC plates, rod iron antivibrator is observed and is changed after not only improving shake by such way, is also beneficial to prevent rod iron antivibrator corrosion.
5. the diameter of rod iron antivibrator to be slightly smaller than the diameter of reserving hole channel, the upper and lower end of mild steel plug is connected with the embedded bar of upper segment and cushion cap respectively by steel bushing, not only improve the replacing to rod iron antivibrator after shake, also ensure that plug can Free Transform under geological process encourages.
6. 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-viscoelastic material layer, 4-reserving hole channel, 5-mild steel plug, 6-circular steel jacketing, 7-finish rolling deformed bar, 8-high-strength nut, 9-steel plate washer, 10-steel bushing, 11-upper segment, 12-embedded bar, 13-rubber spacer.
Detailed description of the invention
The present invention is a kind of by utilizing the built-in rod iron antivibrator of replaceable UHPC plate and viscoelastic material layer 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, viscoelastic material layer, mild steel plug, circular steel jacketing, 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, between UHPC plate and bridge pier coxopodite section, viscoelastic material layer is set, it is connected by cementing between viscoelastic material layer with UHPC plate, and by frictional force power transmission between bridge pier coxopodite section, reserving hole channel between two blocks of UHPC plates, for placing the rod iron antivibrator of mild steel plug and steel thimble composition, 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.
Coefficient of friction between described viscoelastic material layer and bridge pier coxopodite section should be less than the coefficient of friction between UHPC plate, by applying suitable prestressing force, ensure, under geological process encourages, less relative displacement only occurs between bridge pier coxopodite section and UHPC plate, viscoelastic material layer can occur detrusion to produce power consumption, does not have relative displacement between two blocks of UHPC plates.
Described circular steel jacketing diameter is slightly smaller than the diameter in duct, wherein the upper and lower end of mild steel plug 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 mild steel plug be subject to tension and compression repeatedly and elastic-plastic deformation occurs, reach the purpose of power consumption.Wherein the steel thimble in rod iron antivibrator plays the effect preventing mild steel plug generation buckling failure, filling epoxy resin between steel thimble and mild steel plug.
The described duct in replaceable UHPC plate and rod iron antivibrator are 12.
Stem grafting seam section assembling bridge pier coxopodite section and UHPC plate top need to arrange rubber spacer, 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 rod iron antivibrator of replaceable UHPC plate and viscoelastic material layer to improve stem grafting seam section assembling bridge pier energy dissipation capacity under geological process encourages and the method such as Fig. 1 preventing coxopodite section from crushing, the method relates to bridge pier coxopodite section 1, UHPC plate 2, viscoelastic material layer 3, reserving hole channel 4, mild steel plug 5, circular steel jacketing 6, finish rolling deformed bar 7, high-strength nut 8, steel plate washer 9, steel bushing 10, upper segment 11, embedded bar 12 and rubber spacer 13.The described reserving hole channel 4 in replaceable UHPC plate and rod iron antivibrator are 12.
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 11 bottom surface has bondd rubber spacer 13, by post-tensioned prestressing, each sections is connected into entirety；
Step 2: being sequentially placed one block of UHPC plate 2 on coxopodite section 1 four limit, viscoelastic material layer 3 has been bonded on UHPC plate 2 such as Fig. 2 in precast plant；
Step 3: the rod iron antivibrator being made up of mild steel plug 5 and circular steel jacketing 6 is placed on the groove of UHPC plate 2, and is connected with the embedded bar 12 in upper segment 11 and cushion cap respectively by steel bushing 10；
Step 4: be sequentially placed another block UHPC plate 2 on coxopodite section 1 four limit such as Fig. 2, two blocks of UHPC plates 2 align at reserving hole channel 4 place, and now rod iron antivibrator is just in reserving hole channel 4；
Step 5: by finish rolling deformed bar 7 through the duct being reserved on coxopodite section 1 and UHPC plate 2, according to regulation about stretch-draw finish rolling deformed bar 7 in " highway bridge and culvert construction technique normalizing " JTG/TF50-2011, utilize relevant device to finish rolling deformed bar 7 Shi Hanzhang, and use high-strength nut 8 and steel plate washer 9 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 4 and rod iron antivibrator are 12, reserving hole channel 4 diameter is slightly larger than the diameter of circular steel jacketing 6, when stem grafting stitches the occurred level deformation under geological process encourages of section assembling bridge pier, whole rod iron antivibrator 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 built-in rod iron antivibrator and viscoelastic material consumes energy and anti-crushed structure, it is characterized in that, utilize the built-in rod iron antivibrator of replaceable UHPC plate and viscoelastic material layer to improve stem grafting seam section assembling bridge pier energy dissipation capacity under geological process encourages and to prevent coxopodite section from crushing, this structure respectively arranges two blocks of UHPC plates (2) being superimposed in the outside on bridge pier coxopodite section (1) four limit, between bridge pier coxopodite section (1) outside and UHPC plate (2), viscoelastic material layer (3) is set, between the UHPC plate (2) that two pieces are superimposed, reserving hole channel (4) is used for placing the rod iron antivibrator being made up of mild steel plug (5) and circular steel jacketing (6)；Finish rolling deformed bar (7) is horizontally through described UHPC plate (2) and bridge pier coxopodite section (1), described UHPC plate (2) and bridge pier coxopodite section (1), by high-strength nut (8) and steel plate washer (9) anchoring, are combined into entirety by finish rolling deformed bar (7) Shi Hanzhang by the two ends of finish rolling deformed bar (7)；Described mild steel plug (5) is connected with the embedded bar (12) of upper segment (11) and cushion cap respectively by threaded steel bushing (10)；Need to arrange rubber spacer (13) between described bridge pier coxopodite section (1) and UHPC plate (2) and upper segment (11), prevent under geological process encourages owing to the collision of coxopodite section (1) causes upper segment (11) to damage, upper segment (11), to increase wall thickness with coxopodite section (1) seam crossing, is gradually reduced to wall thickness.
2. the bridge pier of built-in rod iron antivibrator according to claim 1 and viscoelastic material consumes energy and anti-crushed structure, it is characterised in that described reserving hole channel (4) diameter is slightly larger than the diameter of circle property steel thimble (6).
3. the bridge pier of built-in rod iron antivibrator according to claim 1 and viscoelastic material 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 |
|---|---|---|---|
| CN201610107166.2A CN105735109B (en) | 2016-02-26 | 2016-02-26 | Bridge pier power consumption and the anti-crushed structure of built-in rod iron damper and viscoelastic material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610107166.2A CN105735109B (en) | 2016-02-26 | 2016-02-26 | Bridge pier power consumption and the anti-crushed structure of built-in rod iron damper and viscoelastic material |
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| Publication Number | Publication Date |
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| CN105735109A true CN105735109A (en) | 2016-07-06 |
| CN105735109B CN105735109B (en) | 2017-06-16 |
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| CN201610107166.2A Active CN105735109B (en) | 2016-02-26 | 2016-02-26 | Bridge pier power consumption and the anti-crushed structure of built-in rod iron damper and viscoelastic material |
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2016
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| JP2004190254A (en) * | 2002-12-09 | 2004-07-08 | Mitsubishi Heavy Ind Ltd | Base isolating device for bridge pier, and bridge equipped with the same |
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| CN105735109B (en) | 2017-06-16 |
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