CN105735113A - Pier pile transition connection structure for concrete-filled steel tube bridge and construction method of pier pile transition connection structure - Google Patents
Pier pile transition connection structure for concrete-filled steel tube bridge and construction method of pier pile transition connection structure Download PDFInfo
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- CN105735113A CN105735113A CN201610247467.5A CN201610247467A CN105735113A CN 105735113 A CN105735113 A CN 105735113A CN 201610247467 A CN201610247467 A CN 201610247467A CN 105735113 A CN105735113 A CN 105735113A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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Abstract
The invention belongs to the technical field of bridge construction projects and particularly relates to a pier pile transition connection structure for a concrete-filled steel tube bridge and a construction method of the pier pile transition connection structure. The pier pile transition connection structure comprises a pile foundation and a pier body arranged on the pile foundation; the pier body adopts a concrete-filled steel tube structure and comprises a pier body steel tube and concrete poured in the pier body steel tube. According to the pier pile transition connection structure provided by the invention, the concrete-filled steel tube structure is selected as the pier body; during construction, the pier body steel tube is firstly arranged on the pile foundation, and then the concrete is directly poured in the pier body steel tube, so that the use of a large amount of templates is directly avoided, a reinforcing steel bar framework is not needed to be rolled before concrete pouring, the construction processes are reduced, the construction difficulty and the construction cost are reduced, and the construction period is also shortened; moreover, after the completion of pouring, compared with a traditional reinforced concrete pier body, the pier pile transition connection structure has the advantages that the maintenance process is simple, the maintenance time is short, and the construction cost is further reduced.
Description
Technical field
The invention belongs to bridge construction field of engineering technology, be specifically related to a kind of pier stake transition connecting construction for concrete filled steel tube bridge and construction method thereof.
Background technology
In bridge construction field of engineering technology, the basic structure of bridge mainly includes beam body and for supporting the bridge pier of beam body, for bridge pier, bridge pier is arranged on pile foundation, and whether bridge structure is safe and reliable, and bridge pier plays conclusive effect, so, the bearing capacity of bridge, and the reliability being connected between bridge pier with pile foundation, be all unavoidable problem in Bridge Design and work progress.
At present, in bridge structure, bridge pier is typically with concrete pier, xoncrete structure has good anti-pressure ability, so can both play a supporting role reliably in normal conditions, in work progress, first it is need in pile foundation, set up formwork for placing, then casting concrete in formwork for placing, obtains bridge pier structure after concrete hardening.
Progress along with technology, the deficiency of above-mentioned concrete bridge pier structure highlights day by day, owing to xoncrete structure has good anti-pressure ability, but, its shear resistance is poor, and China is located between circum-Pacific seismic belt and Eurasian earthquake zone, and the most area on territory is earthquake territory, particularly the west area of China mostly is meizoseismal area, and seismic activity is frequent.Bridge is the multi-purpose project of transportation lifeline, and its construction cost is high, once suffer eaerthquake damage, it will causes huge economic loss, and repairs extremely difficult after shake.Occur directly in the number of casualties on bridge and few, but the economic loss and the casualties that cause due to transportation lifeline damage, interruption are inestimable, causing rescue personnel not to be in time, a lot of people are aggravated earthquake disaster because of not rescuing in time.Meanwhile, the large bridge reparation wrecked is got up relatively difficult, has a strong impact on the reconstruction after disaster area productive life and calamity.
For firm the problems referred to above, reinforced concrete bridge pier structure enters among the people visual field, when construction, first it is in pile foundation, roll reinforcing bar, then sets up template then casting concrete again, the bridge pier of reinforced concrete structure is formed after hardening, owing to being provided with reinforcing bar in bridge pier so that bridge pier has good bending resistance and shear resistance, and then improves the reliability of bridge.
But, in actual design and construction, inventors herein have recognized that above-mentioned is concrete pier or reinforced concrete bridge pier all still also exists deficiency is embodied in following several respects:
On the one hand: no matter be concrete pier or reinforced concrete bridge pier, it is required for when building setting up a large amount of template, for ungetable remote districts, not only increases difficulty of construction and construction cost, but also extend the construction time limit；
On the other hand: for reinforced concrete bridge pier, owing to it also needs to roll reinforcing bar, so also further adding difficulty of construction, construction cost, and the construction time limit；
Another further aspect: no matter be concrete pier or reinforced concrete bridge pier, after building, in addition it is also necessary to longer curing time, maintenance difficulty, the whole maintenance processes time is long, and difficulty is big, so also further adding the construction cost of bridge pier；
Another further aspect: no matter being concrete pier or reinforced concrete bridge pier, outside its concrete is all an exposure to, erosion resistibility is poor, the serious stability that have impact on bridge pier quality and reliability.
So, based on above-mentioned, need a kind of bridge pier structure that can solve the problem that above-mentioned technical problem at present badly.
Summary of the invention
It is an object of the invention to, the difficulty of construction existed for current bridge pier structure is big, construction cost is high, duration is longer, the deficiency of erosion resistibility difference, it is provided that one can either reduce difficulty of construction, save construction cost, reduction of erection time, there is again good erosion resistibility, improve the bridge structure of bridge pier reliability.
In order to realize foregoing invention purpose, the invention provides techniques below scheme:
A kind of pier stake transition connecting construction for concrete filled steel tube bridge, including pile foundation and the pier shaft being arranged in pile foundation, described pier shaft is concrete filled steel tube, including pier shaft steel pipe and the concrete being cast in pier shaft steel pipe.
The pier stake transition connecting construction for concrete filled steel tube bridge of the application, select concrete filled steel tube as pier shaft, when construction, first pier shaft steel pipe is arranged in pile foundation, then directly at pier shaft pouring concrete within steel pipe, directly avoids the use of a large amount of template, also without rolling framework of steel reinforcement before concrete perfusion, save working procedure, reduced difficulty of construction and construction cost, also shorten the construction period；On the other hand, after building, more traditional armored concrete pier shaft, maintenance processes is simple, and curing time is short, also further reduces construction cost；Another further aspect, owing to the periphery of concrete filled steel tube is steel pipe, concrete is all covered by steel pipe, it is to avoid concrete is subject to outside and washes away, so also make pier shaft quality have good stability and reliability.
As preferably, described pier shaft steel pipe includes the changeover portion steel pipe being positioned below, and the inwall of described changeover portion steel pipe is connected to some shear connectors being vertically arranged, and described shear connector is along the central axis circumference uniform distribution of described changeover portion steel pipe.
In such scheme, arranging shear connector by being arranged on changeover portion steel pipe inner wall, shear connector is embedded in concrete, and changeover portion steel pipe stress is delivered in concrete by shear connector, improves the structural strength of concrete filled steel tube.
As preferably, described shear connector lower end beyond the lower end of described changeover portion steel pipe, and with the upper end matching ends of described pile foundation.
As preferably, the lower end of a portion shear connector is arranged in described pile foundation, and the lower end of another part shear connector and described pile foundation are spaced apart, and the shear connector that lower end is arranged in pile foundation is arranged with the shear connector interval that lower end and pile foundation are spaced apart.
In such scheme, the lower end of changeover portion steel pipe is stretched out in shear connector lower end so that the lower end of changeover portion steel pipe and pile foundation upper end separate, and so arrange so that before pouring concrete within steel pipe, it is possible to facilitate the adjustment of pier shaft steel pipe position；And, when concrete perfusion, concrete can flow out from the gap between changeover portion steel pipe and pile foundation, improves the density of changeover portion steel pipe lower concrete perfusion；Another further aspect, owing to steel pipe itself has heavier weight, so when steel pipe arranges and puts in place, under weight effect, the bottom of shear connector and pile foundation upper end fit tightly, and are even partially submerged in pile foundation, so, improve the globality between shear connector and pile foundation, it is ensured that between pier shaft and pile foundation stress transmission uniformity and reliability；Another further aspect, owing to the setting of shear connector can also be greatly improved the bending strength of changeover portion concrete filled steel tube, further improves the reliability and stability of the application pier stud transition connecting construction.
As preferably, described shear connector is the steel plate of strip, and the length direction of described shear connector is paralleled with the central axis of described changeover portion steel pipe, and the width of described shear connector is radially consistent with described changeover portion steel pipe.
As preferably, described shear connector being provided with some first through holes along its length, is spaced apart between adjacent two the first through holes, is equipped with reinforcing bar in described first through hole.
In such scheme, wearing reinforcing bar in the first through hole, reinforcing bar, through the first different through holes, is further ensured that the uniformity of shear connector transmission power, further increases the mechanical property of the concrete filled steel tube of changeover portion.
As preferably, described changeover portion steel pipe being provided with the second through hole, the reinforcing bar of traverse the first through hole is also through the second through hole.
Changeover portion steel pipe arranges the second through hole, in the second through hole, also wears reinforcing bar, further improve the compactness being connected between changeover portion steel pipe and concrete, improve the structural behaviour of changeover portion concrete filled steel tube further.
As preferably, being vertically arranged with main muscle in described pile foundation, adjacent main muscle spaced apart, main ribs is arranged in the form of a ring, and pile foundation is stretched out in main muscle upper end, and outside with described changeover portion steel pipe.
As preferably, main ribs the first half is bent on described changeover portion steel pipe, and with described changeover portion steel-pipe welding.
In the such scheme of the application, the main muscle of pile foundation is upwardly extended, and by the first half bending and changeover portion steel-pipe welding, both ensure that the concrete tensile strength in changeover portion concrete filled steel tube, the effect of supporting steel pipe can be played again, so being also convenient for construction in the operation arrange steel pipe.
As preferably, main ribs being banded with ring muscle, described ring muscle is at least two, is spaced apart between adjacent two ring muscle.
In such scheme, by arranging ring muscle, further improve the globality between each main muscle, improve the bonding strength between main muscle and changeover portion steel pipe.
As preferably, casing steel pipe also it is arranged with outside described changeover portion steel pipe, the internal diameter of described casing steel pipe is more than the external diameter of described changeover portion steel pipe, described casing steel pipe and changeover portion steel pipe are coaxially disposed, gap is formed between casing steel pipe and changeover portion steel pipe, main ribs and ring muscle are positioned at this gap, and described casing steel pipe lower end is arranged in described pile foundation, is perfused with concrete in described casing steel pipe.
In the such scheme of the application, casing steel pipe is set, at casing pouring concrete within steel pipe, this concrete is when the concrete irrigated in pier shaft steel pipe, perfusion enters casing steel pipe together, so, concrete in casing steel pipe is integral type reperfusion structure with the concrete in changeover portion steel pipe, there is good globality and concordance, by above-mentioned, that is, changeover portion steel pipe place in the application, it is have two-layer steel pipe and two layer concretes, first the connection area between pier shaft and pile foundation it is increased, and then improve the bonding strength between pier shaft and pile foundation；Meanwhile, also increase the cross section at this place, improve structural strength and the rigidity at this place so that be connected relatively reliable between pier shaft with pile foundation；Another further aspect, due to the setting of casing steel pipe, also further enhances the bending strength of the structure at changeover portion steel pipe place, also improves protection against erosion ability and the impact resistance at this place, further improves the application reliability of structure.
As preferably, described casing steel pipe upwardly extends and exceeds main ribs along described changeover portion steel pipe, and this between described casing steel pipe upper end and described changeover portion steel pipe have shrouding.Arranging shrouding in casing steel pipe upper end, it is to avoid in concrete perfusion process, concrete flows out from casing steel pipe upper end.
As preferably, being additionally provided with bar-mat reinforcement in the concrete between described changeover portion steel pipe and pile foundation, described bar-mat reinforcement is at least two-layer.
In such scheme, in the concrete between changeover portion steel pipe and pile foundation, bar-mat reinforcement is set so that pile foundation top is more uniformly stressed, reduces the risk that pile foundation top occurs that stress is concentrated.
As preferably, described bar-mat reinforcement is corresponding with described ring muscle to be arranged, the end of described bar-mat reinforcement is welded on each self-corresponding described ring muscle.The end of bar-mat reinforcement is welded on each self-corresponding ring muscle, the risk that when being first that of avoiding filling concrete, bar-mat reinforcement is shifted over, also further improve the bonding strength between each main muscle simultaneously, make the stress between main muscle and bar-mat reinforcement mutually coordinated, further increase structural strength and the rigidity at this place.
As preferably, casing steel pipe inner wall is additionally provided with the hoop of some ring-types, is spaced apart between adjacent two hoops.Hoop is set at casing steel pipe inner wall, while improving casing steel-tube construction intensity, too increases the bonding strength between casing steel pipe and concrete, further improve the structural strength of casing steel pipe.
The pier stake transition connecting construction of the application, concrete pier of steel tube is Novel steel-concrete composite structure, concrete filled steel tube pier shaft and reinforced concrete pile are directly connected to, the such scheme of the application ensure that the reliability being connected between pier shaft with pile foundation, and the inside power transmission between pier shaft and pile foundation is clear and definite, and the main muscle part of pile foundation is welded on steel pipe, both ensure that concrete section tensile strength, achieving again pier stake vertically to connect, casing steel pipe sets hoop and ensures external wrapping concrete shearing strength；Changeover portion steel pipe pier sets shear connector with holes, it is possible to be transferred to gradually in concrete by steel pipe walls internal force；Pile foundation top sets the bar-mat reinforcement of at least two-layer distribution, it is to avoid stress is concentrated, and makes pile foundation end face concrete stress evenly；Casing steel pipe had both strengthened the bending strength at changeover portion steel pipe place, again can as protection against erosion, anti-collision structure；Concrete perfusion between changeover portion steel pipe place two-layer steel pipe, increases cross section, improves the strength and stiffness connecting node, makes the connection between pier shaft and pile foundation relatively reliable.
Disclosed herein as well is a kind of construction method for above-mentioned pier stake transition connecting construction, comprise the steps:
One, pile foundation is built: arrange main muscle in Pile Foundations Design position, then casting concrete, and concrete is stretched out in the upper part of main muscle；
Two, pier shaft steel pipe is made: inside the changeover portion steel pipe of pier shaft steel pipe, be provided with the shear connector of the first through hole, and on the sidewall of changeover portion steel pipe, open the second through hole；
Three, location pier shaft steel pipe: the pile foundation in step one is hardened, and, after the pier shaft steel pipe manufacturing of step 2 completes, pier shaft steel pipe is lifted in pile foundation, adjusting pier shaft steel pipe position, make the position of pier shaft steel pipe be positioned at design attitude, the main muscle of pile foundation is surrounded on the periphery of changeover portion steel pipe；
Four, main muscle and changeover portion steel pipe are connected: bend the first half of main muscle so that it is near changeover portion steel pipe, and be welded on changeover portion steel pipe；
Five, ring muscle and bar-mat reinforcement are set: colligation ring muscle on main muscle, and between changeover portion steel pipe lower end and pile foundation top colligation at least two-layer bar-mat reinforcement, and wear reinforcing bar in the first through hole and the second through hole；
Six, casing steel pipe is made: weld the hoop of some ring-types at casing steel pipe inner wall, and shrouding is set in one end of casing steel pipe；
Seven, location casing steel pipe: lifting step 6 makes the casing steel pipe obtained to pile foundation, and casing steel pipe socket is located at outside main muscle, adjusts after design attitude, is welded with changeover portion by shrouding；
Eight, concrete perfusion: after the seam welds between step 7 shrouding and changeover portion steel pipe, is thought pier shaft pouring concrete within steel pipe by the open top of pier shaft steel pipe, until the full whole pier shaft steel pipe of filling concrete and casing steel pipe；
Nine, maintenance: maintenance pile foundation and pier shaft.
The construction method of the application, directly avoid the template adopted in a large number in traditional bridge pier casting process, also setting up operation and removing operation of template is avoided, shorten the construction period greatly, save construction cost, and, owing to pier shaft adopts concrete filled steel tube, late maintaining is convenient, also saves maintenance cost, simplifies maintenance operation.
Compared with prior art, beneficial effects of the present invention:
1, the pier stake transition connecting construction for concrete filled steel tube bridge of the application, select concrete filled steel tube as pier shaft, when construction, first steel pipe is arranged in pile foundation, then directly at pouring concrete within steel pipe, directly avoids the use of a large amount of template, also without rolling framework of steel reinforcement before concrete perfusion, save working procedure, reduced difficulty of construction and construction cost, also shorten the construction period；
2, after building, more traditional armored concrete pier shaft, maintenance processes is simple, and curing time is short, also further reduces construction cost；
3, owing to the periphery of concrete filled steel tube is steel pipe, concrete is all covered by steel pipe, it is to avoid concrete is subject to outside and washes away, so also make pier shaft quality have good stability and reliability.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of the application pier stake transition connecting construction；
Fig. 2 is the structural representation arranging ring muscle on main muscle；
Fig. 3 is the partial structurtes schematic diagram that changeover portion steel pipe wears reinforcing bar；
Fig. 4 is the structural representation of bar-mat reinforcement,
Labelling in figure: 1-pile foundation, 2-pier shaft, 3-changeover portion steel pipe, 4-shear connector, 5-the first through hole, 6-the second through hole, 7-reinforcing bar, the main muscle of 8-, 9-ring muscle, 10-casing steel pipe, 11-shrouding, 12-bar-mat reinforcement, 13-hoop, 14-pier shaft steel pipe.
Detailed description of the invention
Below in conjunction with test example and detailed description of the invention, the present invention is described in further detail.But this should not being interpreted as, the scope of the above-mentioned theme of the present invention is only limitted to below example, and all technology realized based on present invention belong to the scope of the present invention.
Embodiment 1, as Figure 1-4:
A kind of pier stake transition connecting construction for concrete filled steel tube bridge, including pile foundation 1 and the pier shaft 2 being arranged in pile foundation 1, described pier shaft 2 is concrete filled steel tube, including pier shaft steel pipe 14 and the concrete being cast in pier shaft steel pipe 14.
The pier stake transition connecting construction for concrete filled steel tube bridge of the application, select concrete filled steel tube as pier shaft 2, when construction, first being arranged in pile foundation 1 by pier shaft steel pipe 14, then direct concrete perfusion in pier shaft steel pipe 14, directly avoids the use of a large amount of template, also without rolling reinforcing bar 7 skeleton before concrete perfusion, save working procedure, reduced difficulty of construction and construction cost, also shorten the construction period；On the other hand, after building, more traditional reinforcing bar 7 concrete pier shaft 2, maintenance processes is simple, and curing time is short, also further reduces construction cost；Another further aspect, owing to the periphery of concrete filled steel tube is steel pipe, concrete is all covered by steel pipe, it is to avoid concrete is subject to outside and washes away, so also make pier shaft 2 mass have good stability and reliability.
As preferably, described pier shaft steel pipe 14 includes the changeover portion steel pipe 3 being positioned below, and the inwall of described changeover portion steel pipe 3 is connected to some shear connectors 4 being vertically arranged, and described shear connector 4 is along the central axis circumference uniform distribution of described changeover portion steel pipe 3.
In such scheme, arranging shear connector 4 by being arranged on changeover portion steel pipe 3 inwall, shear connector 4 is embedded in concrete, and pier shaft steel pipe 14 stress is delivered in concrete by shear connector 4, improves the structural strength of concrete filled steel tube.
As preferably, described shear connector 4 lower end beyond the lower end of described changeover portion steel pipe 3, and with the upper end matching ends of described pile foundation 1.
As preferably, the lower end of a portion shear connector 4 is arranged in described pile foundation 1, and the lower end of another part shear connector 4 and described pile foundation 1 are spaced apart, and the shear connector 4 that lower end is arranged in pile foundation 1 is arranged with shear connector 4 interval that lower end and pile foundation 1 are spaced apart.
In such scheme, the lower end of changeover portion steel pipe 3 is stretched out in shear connector 4 lower end so that the lower end of changeover portion steel pipe 3 and pile foundation 1 upper end separate, and so arrange so that before pouring concrete within steel pipe, it is possible to facilitate the adjustment of steel pipe position；And, when concrete perfusion, concrete can flow out from the gap between changeover portion steel pipe 3 and pile foundation 1, improves the density of changeover portion steel pipe 3 lower concrete perfusion；Another further aspect, owing to steel pipe itself has heavier weight, so when steel pipe arranges and puts in place, under weight effect, the bottom of shear connector 4 and pile foundation 1 upper end fit tightly, and are even partially submerged in pile foundation 1, so, improve the globality between shear connector 4 and pile foundation 1, it is ensured that between pier shaft 2 and pile foundation 1 stress transmission uniformity and reliability；Another further aspect, owing to the setting of shear connector 4 can also be greatly improved the concrete bending strength of changeover portion steel pipe 3, further improves the reliability and stability of the application pier stud transition connecting construction.
As preferably, described shear connector 4 is the steel plate of strip, and the length direction of described shear connector 4 is paralleled with the central axis of described changeover portion steel pipe 3, and the width of described shear connector 4 is radially consistent with described changeover portion steel pipe 3.
As preferably, described shear connector 4 being provided with some first through holes 5 along its length, is spaced apart between adjacent two the first through holes 5, is equipped with reinforcing bar 7 in described first through hole 5.
In such scheme, wearing reinforcing bar 7 in the first through hole 5, reinforcing bar 7, through the first different through holes 5, is further ensured that shear connector 4 transmits the uniformity of power, further increases the mechanical property of the concrete filled steel tube of changeover portion.
As preferably, described changeover portion steel pipe 3 being provided with the second through hole 6, the reinforcing bar 7 of traverse the first through hole 5 is also through the second through hole 6.
Changeover portion steel pipe 3 arranges the second through hole 6, in the second through hole 6, also wears reinforcing bar 7, further improve the compactness being connected between changeover portion steel pipe 3 and concrete, improve the concrete structural behaviour of changeover portion steel pipe 3 further.
As preferably, being vertically arranged with main muscle 8 in described pile foundation 1, adjacent main muscle 8 spaced apart, main ribs 8 is arranged in the form of a ring, and pile foundation 1 is stretched out in main muscle 8 upper end, and outside with described changeover portion steel pipe 3.
As preferably, main ribs 8 the first half is bent on described changeover portion steel pipe 3, and welds with described changeover portion steel pipe 3.
In the such scheme of the application, the main muscle 8 of pile foundation 1 is upwardly extended, and the first half bending is welded with changeover portion steel pipe 3, both ensure that the concrete tensile strength in changeover portion steel pipe 3 xoncrete structure, the effect of supporting steel pipe can be played again, so being also convenient for construction in the operation arrange steel pipe.
As preferably, main ribs 8 being banded with ring muscle 9, described ring muscle 9 is at least two, is spaced apart between adjacent two ring muscle 9.
In such scheme, by arranging ring muscle 9, further improve the globality between each main muscle 8, improve the bonding strength between main muscle 8 and changeover portion steel pipe 3.
As preferably, described changeover portion steel pipe 3 is outer is also arranged with casing steel pipe 10, the internal diameter of described casing steel pipe 10 is more than the external diameter of described changeover portion steel pipe 3, described casing steel pipe 10 is coaxially disposed with changeover portion steel pipe 3, gap is formed between casing steel pipe 10 and changeover portion steel pipe 3, main ribs 8 and ring muscle 9 are positioned at this gap, and described casing steel pipe 10 lower end is arranged in described pile foundation 1, is perfused with concrete in described casing steel pipe 10.
In the such scheme of the application, casing steel pipe 10 is set, concrete perfusion in casing steel pipe 10, this concrete is when the concrete irrigated in pier shaft steel pipe 14, perfusion enters casing steel pipe 10 together, so, concrete in casing steel pipe 10 is integral type reperfusion structure with the concrete in changeover portion steel pipe 3, there is good globality and concordance, by above-mentioned, that is, changeover portion steel pipe 3 place in the application, it is have two-layer steel pipe and two layer concretes, first the connection area between pier shaft 2 and pile foundation 1 it is increased, and then improve the bonding strength between pier shaft 2 and pile foundation 1；Meanwhile, also increase the cross section at this place, improve structural strength and the rigidity at this place so that be connected relatively reliable between pier shaft 2 with pile foundation 1；Another further aspect, due to the setting of casing steel pipe, also further enhances the bending strength of the structure at changeover portion steel pipe 3 place, also improves protection against erosion ability and the impact resistance at this place, further improves the application reliability of structure.
As preferably, described casing steel pipe 10 upwardly extends along described changeover portion steel pipe 3 and exceeds main ribs 8, and this between described casing steel pipe 10 upper end and described changeover portion steel pipe 3 have shrouding 11.Arranging shrouding 11 in casing steel pipe 10 upper end, it is to avoid in concrete perfusion process, concrete flows out from casing steel pipe 10 upper end.
As preferably, being additionally provided with bar-mat reinforcement 12 in the concrete between described changeover portion steel pipe 3 and pile foundation 1, described bar-mat reinforcement 12 is at least two-layer.
In such scheme, bar-mat reinforcement 12 is set in the concrete between changeover portion steel pipe 3 and pile foundation 1 so that pile foundation 1 top is more uniformly stressed, reduces pile foundation 1 top and the risk that stress is concentrated occurs.
As preferably, described bar-mat reinforcement 12 is corresponding with described ring muscle 9 to be arranged, the end of described bar-mat reinforcement 12 is welded on each self-corresponding described ring muscle 9.The end of bar-mat reinforcement 12 is welded on each self-corresponding ring muscle 9, the risk that when being first that of avoiding filling concrete, bar-mat reinforcement 12 is shifted over, also further improve the bonding strength between each main muscle 8 simultaneously, make the stress between main muscle 8 and bar-mat reinforcement 12 mutually coordinated, further increase structural strength and the rigidity at this place.
As preferably, casing steel pipe 10 inwall is additionally provided with the hoop 13 of some ring-types, is spaced apart between adjacent two hoops 13.Hoop 13 is set at casing steel pipe 10 inwall, while improving casing steel pipe 10 structural strength, too increases the bonding strength between casing steel pipe 10 and concrete, further improve the structural strength of casing steel pipe 10.
The pier stake transition connecting construction of the application, concrete pier of steel tube is Novel steel-concrete composite structure, concrete filled steel tube pier shaft 2 and reinforcing bar 7 concrete-pile are directly connected to, the such scheme of the application ensure that the reliability being connected between pier shaft 2 with pile foundation 1, and the inside power transmission between pier shaft 2 and pile foundation 1 is clear and definite, pile foundation 1 main muscle 8 part is welded on steel pipe, both ensure that concrete section tensile strength, achieving again pier stake vertically to connect, casing steel pipe 10 sets hoop 13 and ensures external wrapping concrete shearing strength；Changeover portion steel pipe 3 pier sets shear connector 4 with holes, it is possible to be transferred to gradually in concrete by steel pipe walls internal force；Pile foundation 1 top sets the bar-mat reinforcement 12 of at least two-layer distribution, it is to avoid stress is concentrated, and makes pile foundation 1 end face concrete stress evenly；Casing steel pipe 10 had both strengthened the bending strength at changeover portion steel pipe 3 place, again can as protection against erosion, anti-collision structure；Concrete perfusion between changeover portion steel pipe 3 place two-layer steel pipe, increases cross section, improves the strength and stiffness connecting node, makes the connection between pier shaft 2 and pile foundation 1 relatively reliable.
Embodiment 2, as Figure 1-4:
A kind of construction method for embodiment 1 pier stake transition connecting construction, comprises the steps:
One, pile foundation 1 is built: arranging main muscle 8, then casting concrete at pile foundation 1 design attitude, concrete is stretched out in the upper part of main muscle 8；
Two, pier shaft steel pipe 14 is made: inside the changeover portion steel pipe 3 of pier shaft steel pipe 14, be provided with the shear connector 4 of the first through hole 5, and on the sidewall of changeover portion steel pipe 3, open the second through hole 6；
Three, location pier shaft steel pipe 14: the pile foundation 1 in step one is hardened, and, after the pier shaft steel pipe 14 of step 2 completes, pier shaft steel pipe 14 is lifted in pile foundation 1, adjust pier shaft steel pipe 14 position, the position making pier shaft steel pipe 14 is positioned at design attitude, and the main muscle 8 of pile foundation 1 is surrounded on the periphery of changeover portion steel pipe 3；
Four, main muscle 8 and changeover portion steel pipe 3 are connected: bend the first half of main muscle 8 so that it is near changeover portion steel pipe 3, and be welded on changeover portion steel pipe 3；
Five, ring muscle 9 and bar-mat reinforcement 12 are set: colligation ring muscle 9 on main muscle 8, and between changeover portion steel pipe 3 lower end and pile foundation 1 top colligation at least two-layer bar-mat reinforcement 12, and wear reinforcing bar 7 in the first through hole 5 and the second through hole 6；
Six, casing steel pipe 10 is made: weld the hoop 13 of some ring-types at casing steel pipe 10 inwall, and shrouding 11 is set in one end of casing steel pipe 10；
Seven, location casing steel pipe 10: lifting step 6 makes in casing steel pipe 10 to the pile foundation 1 obtained, and casing steel pipe 10 is sheathed on outside main muscle 8, adjusts after design attitude, is welded with changeover portion by shrouding 11；
Eight, concrete perfusion: after the seam welds between step 7 shrouding 11 and changeover portion steel pipe 3, is thought concrete perfusion in pier shaft steel pipe 14 by the open top of pier shaft steel pipe 14, until the full whole pier shaft steel pipe 14 of filling concrete and casing steel pipe 10；
Nine, maintenance: maintenance pile foundation 1 and pier shaft 2.
The construction method of the application, directly avoid the template adopted in a large number in traditional bridge pier casting process, also setting up operation and removing operation of template is avoided, shorten the construction period greatly, save construction cost, and, owing to pier shaft 2 adopts concrete filled steel tube, late maintaining is convenient, also saves maintenance cost, simplifies maintenance operation.
Above example only in order to the present invention is described and and unrestricted technical scheme described in the invention, although this specification with reference to each above-mentioned embodiment to present invention has been detailed description, but the present invention is not limited to above-mentioned detailed description of the invention, therefore any the present invention modified or equivalent replaces；And all are without departing from the technical scheme of spirit and scope of invention and improvement thereof, it all should be encompassed in the middle of scope of the presently claimed invention.
Claims (10)
1. for the pier stake transition connecting construction of concrete filled steel tube bridge, it is characterised in that: including pile foundation and the pier shaft being arranged in pile foundation, described pier shaft is concrete filled steel tube, including pier shaft steel pipe and the concrete being cast in pier shaft steel pipe.
2. pier stake transition connecting construction as claimed in claim 1, it is characterized in that: described pier shaft steel pipe includes the changeover portion steel pipe being positioned below, the inwall of described changeover portion steel pipe is connected to some shear connectors being vertically arranged, and described shear connector is along the central axis circumference uniform distribution of described changeover portion steel pipe.
3. pier stake transition connecting construction as claimed in claim 2, it is characterised in that: described shear connector lower end beyond the lower end of described changeover portion steel pipe, and with the upper end matching ends of described pile foundation.
4. pier stake transition connecting construction as claimed in claim 3, it is characterized in that: the lower end of a portion shear connector is arranged in described pile foundation, the lower end of another part shear connector and described pile foundation are spaced apart, and the shear connector that lower end is arranged in pile foundation is arranged with the shear connector interval that lower end and pile foundation are spaced apart.
5. pier stake transition connecting construction as claimed in claim 4, it is characterised in that: described shear connector is provided with some first through holes along its length, is spaced apart between adjacent two the first through holes, in described first through hole, is equipped with reinforcing bar.
6. the pier stake transition connecting construction as described in claim 1-5 any one, it is characterized in that: be vertically arranged with main muscle in described pile foundation, adjacent main muscle spaced apart, main ribs is arranged in the form of a ring, pile foundation is stretched out in main muscle upper end, and surrounds outside with described changeover portion steel pipe.
7. pier stake transition connecting construction as claimed in claim 6, it is characterized in that: main ribs the first half is bent on described changeover portion steel pipe, and with described changeover portion steel-pipe welding, main ribs is banded with ring muscle, described ring muscle is at least two, is spaced apart between adjacent two ring muscle.
8. pier stake transition connecting construction as claimed in claim 7, it is characterized in that: outside described changeover portion steel pipe, be also arranged with casing steel pipe, the internal diameter of described casing steel pipe is more than the external diameter of described changeover portion steel pipe, described casing steel pipe and changeover portion steel pipe are coaxially disposed, gap is formed between casing steel pipe and changeover portion steel pipe, main ribs and ring muscle are positioned at this gap, and described casing steel pipe lower end is arranged in described pile foundation, is perfused with concrete in described casing steel pipe.
9. pier stake transition connecting construction as claimed in claim 8, it is characterised in that: described casing steel pipe upwardly extends and exceeds main ribs along described changeover portion steel pipe, and this between described casing steel pipe upper end and described changeover portion steel pipe have shrouding.
10. the construction method for pier stake transition connecting construction, it is characterised in that: comprise the steps:
One, pile foundation is built: arrange main muscle in Pile Foundations Design position, then casting concrete, and concrete is stretched out in the upper part of main muscle；
Two, pier shaft steel pipe is made: inside the changeover portion steel pipe of pier shaft steel pipe, be provided with the shear connector of the first through hole, and on the sidewall of changeover portion steel pipe, open the second through hole；
Three, location pier shaft steel pipe: the pile foundation in step one is hardened, and, after the pier shaft steel pipe manufacturing of step 2 completes, pier shaft steel pipe is lifted in pile foundation, adjusting pier shaft steel pipe position, make the position of pier shaft steel pipe be positioned at design attitude, the main muscle of pile foundation is surrounded on the periphery of changeover portion steel pipe；
Four, main muscle and changeover portion steel pipe are connected: bend the first half of main muscle so that it is near changeover portion steel pipe, and be welded on changeover portion steel pipe；
Five, ring muscle and bar-mat reinforcement are set: colligation ring muscle on main muscle, and between changeover portion steel pipe lower end and pile foundation top colligation at least two-layer bar-mat reinforcement, and wear reinforcing bar in the first through hole and the second through hole；
Six, casing steel pipe is made: weld the hoop of some ring-types at casing steel pipe inner wall, and shrouding is set in one end of casing steel pipe；
Seven, location casing steel pipe: lifting step 6 makes the casing steel pipe obtained to pile foundation, and casing steel pipe socket is located at outside main muscle, adjusts after design attitude, is welded with changeover portion by shrouding；
Eight, concrete perfusion: after the seam welds between step 7 shrouding and changeover portion steel pipe, is thought pier shaft pouring concrete within steel pipe by the open top of pier shaft steel pipe, until the full whole pier shaft steel pipe of filling concrete and casing steel pipe；
Nine, maintenance: maintenance pile foundation and pier shaft.
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| CN106368116A (en) * | 2016-08-26 | 2017-02-01 | 安徽水利开发股份有限公司 | Construction method of vibration damping bridge pier |
| CN106869156A (en) * | 2017-02-24 | 2017-06-20 | 中铁二十五局集团第五工程有限公司 | A kind of pile pier integral structure construction method |
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| CN110468834A (en) * | 2019-08-23 | 2019-11-19 | 硅湖职业技术学院 | A kind of concrete filled steel tube antidetonation bridge pile foundation and pile base construction method |
| CN110847160A (en) * | 2019-12-12 | 2020-02-28 | 福州大学 | Integral bridge pile foundation structure adopting ECC concrete and construction method thereof |
| CN112030727A (en) * | 2020-08-26 | 2020-12-04 | 绍兴文理学院 | Assembled prefabricated steel-concrete combined pier and construction method thereof |
| CN112900227A (en) * | 2021-01-22 | 2021-06-04 | 浙江兴业市政工程有限公司 | Energy-saving and environment-friendly assembled bridge structure and mounting method thereof |
| CN112900227B (en) * | 2021-01-22 | 2022-02-11 | 浙江兴业市政工程有限公司 | Energy-saving and environment-friendly assembled bridge structure and mounting method thereof |
| CN114150690A (en) * | 2021-11-30 | 2022-03-08 | 西安市政设计研究院有限公司 | Embedded flange for steel column-concrete foundation, connecting structure and construction method |
| CN114541242A (en) * | 2022-01-14 | 2022-05-27 | 东南大学 | Hoop type concrete connecting structure of assembly type pier stud and pile foundation and construction method |
| CN114541242B (en) * | 2022-01-14 | 2024-04-16 | 东南大学 | Anchor ear type concrete connection structure of assembled bridge pier column and pile foundation and construction method |
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