CN110396918A - A kind of equivalent cast-in-place assembled hollow pier system and its construction method - Google Patents
A kind of equivalent cast-in-place assembled hollow pier system and its construction method Download PDFInfo
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- CN110396918A CN110396918A CN201910661186.8A CN201910661186A CN110396918A CN 110396918 A CN110396918 A CN 110396918A CN 201910661186 A CN201910661186 A CN 201910661186A CN 110396918 A CN110396918 A CN 110396918A
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 58
- 239000004567 concrete Substances 0.000 claims abstract description 35
- 239000000835 fiber Substances 0.000 claims abstract description 24
- 239000011440 grout Substances 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims description 16
- 238000003466 welding Methods 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 230000002787 reinforcement Effects 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 10
- 229910052602 gypsum Inorganic materials 0.000 claims description 7
- 239000010440 gypsum Substances 0.000 claims description 7
- 239000011150 reinforced concrete Substances 0.000 claims description 7
- 210000003205 muscle Anatomy 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 5
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- 239000003292 glue Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
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- 239000002245 particle Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000011210 fiber-reinforced concrete Substances 0.000 description 1
- 229920006253 high performance fiber Polymers 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 1
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Classifications
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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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
A kind of equivalent cast-in-place assembled hollow pier system and its construction method, the system includes the prefabricated cushion cap for being embedded with metal bellows, end is equipped with each prefabricated pier shaft segment of longitudinally connected reinforcing bar, prefabricated pier shaft segment includes prefabricated pier bottom segment, segment and the prefabricated pier top segment integral prefabricated with pier cap in each prefabricated pier, the prefabricated guide pad for adjacent each prefabricated pier shaft section assembling；Its construction method is first to lift prefabricated cushion cap in place, then prefabricated pier bottom segment and prefabricated cushion cap are connected as by entirety using the connection of ultra-tough fiber concrete (UTFC) grout lines, hereafter adjacent each prefabricated intersegmental connection of pier shaft is successively completed using ultra-tough fiber concrete (UTFC) wet seam connection, finally it is assemblied into bridge pier entirety, the present invention has speed of application fast, it is small to construction site traffic and surrounding environment influence, the easily controllable advantage of component quality and anti-seismic performance are good, rigidity is big, toughness is high, durability is good, the features such as fatigue resistance is good.
Description
Technical field
The present invention relates to assembled bridge pier field, in particular to a kind of equivalent cast-in-place assembled hollow pier system and its
Construction method.
Background technique
Prefabricated assembled bridge construction technology is short with its construction period, prefabricated components factory mass small to traffic impact
The advantages that life quality is easily controllable, is widely used, prefabricated assembled bridge construction skill in bridge engineering construction
Art has become the Main Trends of The Development of bridge engineering construction.But assembled bridge pier anti-seismic performance is not completely clear, in middle Gao Lie
It applies and is very restricted in degree earthquake territory science of bridge building.Main reason is that in current bridge Ductility Design, bridge
Pier protects remaining structure of bridge usually as the ductile reinforced member in bridge structure, by developing plastic hinge dissipation seismic energy
Part, plastic hinge behavior are also characteristic feature of traditional integral cast-in-situ armored concrete ductility bridge pier under seismic loading,
And the connection of prefabricated components may have an impact the formation of bridge pier plastic hinge in most of current assembled bridge pier systems,
And then the anti-seismic performance of entire bridge structure is influenced, these factors cause assembled bridge pier technology to be difficult at present in middle highlight lines
Earthquake territory is widely popularized and applies.
Bridge pier is mainly vertically divided into several prefabricated pier shafts by the research and development about assembled bridge pier system at present
Segment applies prestressing force by presstressed reinforcing steel and each prefabricated pier shaft segment is vertically assemblied into bridge pier entirety, the assembly of such prestressing force
Formula bridge pier system in the science of bridge building of non-antidetonation security area and low intensity in quake zone using more, but for middle highlight lines
The science of bridge building of earthquake territory, such assembled bridge pier system is under seismic loading, cushion cap and bridge pier seam crossing and each pre-
It is also easy to produce stress concentration phenomenon at pier shaft segmental joints processed, and there are energy-dissipating properties poor, loss of prestress, mechanical characteristic and tradition
Integral cast-in-situ bridge pier significant difference, prestressed use increase difficulty and project cost of construction etc., these factors lead to phase
Research achievement is closed to be difficult to promote the use of in middle high intensity Zone science of bridge building at present.In addition, current generation bridge pier type
Selection is from original gravity-type bridge pier gradually to lighter pier transition, in assembled hollow pier between each prefabricated pier shaft segment
Connection processing be design in critical issue, the connecting structure be designed ought whether, directly influence the stress of bridge pier entirety
Performance and construction period and site operation safety.
A kind of assembled bridge pier for being currently adapted for seismic region is equivalent cast-in-place assembled bridge pier system, i.e. one kind has
Mechanical characteristic close with traditional integral cast-in-situ reinforced concrete bridge pier and anti-seismic performance and the dress of expected plastic hinge behavior
With formula bridge pier system.Research has shown that grout lines connection and the connection of wet seam are to be applied to a kind of economy of assembled bridge pier
Effective connection type, but there is the plastic hinge behavior etc. that may influence bridge pier since connection length is larger and ask in two connection types
Topic.Therefore, developing with cost-effectiveness, the quick feasible equivalent cast-in-place assembled bridge pier system of construction is still current assembled
Bridge pier building technology is applied to the technological difficulties that seismic region science of bridge building is faced.
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention provides a kind of equivalent cast-in-place assembled hollow pier system and its applies
Work method is connected using the connection of ultra-tough fiber concrete (UTFC) grout lines and ultra-tough fiber concrete (UTFC) wet seam
It connects and is respectively completed prefabricated pier bottom segment and prefabricated cushion cap and each intersegmental connection of contiguous prefabricated pier shaft, filling can be effectively reduced
Connection length needed for starching pipeline connection and the connection of wet seam improves the mechanical property of seam crossing, and combines reasonable construction
Designing, which reaches the assembled hollow pier system in terms of mechanical characteristic and anti-seismic performance, is equal to cast-in-place performance level, has
The advantages that good integrity, anti-seismic performance are good, rigidity is big, toughness is high, durability is good, construction practicable.
To achieve the above object, the technical scheme of the present invention is realized as follows:
A kind of equivalent cast-in-place assembled hollow pier system, the prefabricated cushion cap 1 including foundation soil is arranged in are prefabricated to hold
Bridge pier is provided with above platform 1, bridge pier is assembled by each prefabricated pier shaft segment 5, and each prefabricated pier shaft segment 5 includes prefabricated pier bottom section
Segment 14 and the prefabricated pier top segment 7 integral prefabricated with pier cap 6 in section 16, prefabricated pier.
The prefabricated cushion cap 1 and each prefabricated pier shaft segment 5, which are that ordinary reinforced concrete is prefabricated, to be formed, and inside configures
There are longitudinal reinforcement 12 and lateral tie 13；Metal bellows 2 is embedded with inside the prefabricated cushion cap 1, top surface is equipped with groove 3；Institute
Stating each prefabricated pier shaft segment 5 is hollow rectangular section, and both ends or one end are equipped with longitudinally connected reinforcing bar 18 and support teeth block 15.
In the prefabricated pier support teeth block 15 of segment 14 and prefabricated 7 bottom end of pier top segment be embedded with thick diameter internal screw thread and
Bolt 8, the support teeth block 15 on 14 top of segment is provided with WELDING STUDS 11 and steel plate 9 in prefabricated pier bottom segment 16 and prefabricated pier.
Splicing is completed using the connection of UTFC grout lines between the prefabricated cushion cap 1 and prefabricated pier bottom segment 16, it is adjacent each
Splicing is completed using the wet seam connection of ultra-tough fiber concrete UTFC between prefabricated pier shaft segment 5；The wet seam of UTFC connects
The bridge pier inner cavity at the place of connecing is provided with for the prefabricated guide pad 19 of each prefabricated pier shaft section assembling and for supporting prefabricated guiding
The lateral support reinforcing bar 20 of block 19, the prefabricated guide pad 19 is prefabricated by gypsum material, and section form can be hollow or solid section
Face.
Longitudinally connected reinforcing bar 18 in the wet seam connection of UTFC between adjacent each prefabricated pier shaft segment 5 is overlapped, is welded
It connects, mechanical connection or memorial alloy connection processing, determination is calculated as follows in the wet seam connection setting length L of UTFC:
In formula:
D is longitudinally connected 18 diameter of reinforcing bar；
fsFor longitudinally connected 18 intensity of reinforcing bar, f is takens=max (1.5fy,fu), wherein fyIt is surrendered by force for longitudinally connected reinforcing bar 18
Degree, fuFor longitudinally connected 18 ultimate strength of reinforcing bar；
fUTFCCompression strength is surveyed for ultra-tough fiber concrete UTFC material 28d；
α is that longitudinally connected 18 diameter of reinforcing bar influences coefficient, when d=12mm, when α=1.0, d=32mm, and α=1.2, d
When between 12~32mm, α value is determined by linear interpolation；
C is that the connection processing of longitudinally connected reinforcing bar 18 influences coefficient, when longitudinally connected reinforcing bar overlaps, welds, is mechanically connected,
When memorial alloy connection processing, c takes 1.0,0.5,0.65,0.87 respectively；
Longitudinally connected reinforcing bar 18 in the UTFC grout lines connection is provided with the vertical muscle removing section 17 of 4d length.
Construction method based on above-mentioned equivalent cast-in-place assembled hollow pier system:
Step 1: hoisting prefabricated cushion cap 1 is in place, and hoisting prefabricated pier bottom segment 16 carries out preassembling with prefabricated cushion cap 1, then
UTFC4 is perfused into pre-buried metal bellows 2 and groove 3, then prefabricated pier bottom segment 16 is lifted to predetermined position and passed through
Bracket is fixed, and assembly is completed with prefabricated cushion cap 1 in prefabricated pier bottom segment 16；
Step 2: then hoisting prefabricated guide pad 19 lifts adjacent to the lateral support reinforcing bar 20 of prefabricated pier bottom segment 16
Segment 14 to prefabricated 16 top of pier bottom segment, passes through prefabricated guide pad 19 and spiral shell in support teeth block 15 and thick diameter in prefabricated pier
Line and bolt 8 complete the adjustment of the assembled position in segment 14 in prefabricated pier and verticality, and by carrying out spot welding to bolt and steel plate 9
It is tentatively fixed to be carried out to segment in the prefabricated pier, then between prefabricated guide pad 19 and prefabricated 5 inner wall of pier shaft segment to connect
Gap carry out epoxide-resin glue 24 filling sealing, make internal model of the prefabricated guide pad 19 as the wet commissural junctions of UTFC；
Step 3: the longitudinally connected reinforcing bar 18 of segment 14 in prefabricated pier bottom segment 16 and contiguous prefabricated pier is overlapped,
Or welding or mechanical connection or memorial alloy connection processing, lateral tie 13 and supporting exterior sheathing 21 are then bound, then pass through
UTFC4 is perfused in grouting port 22, until UTFC4 is emerged from grout outlet 23, is vibrated and is conserved, and the wet seam connection of UTFC has poured
At so far assembly is completed with segment 14 in contiguous prefabricated pier in prefabricated pier bottom segment 16；
Step 4: being repeated in above-mentioned steps two and step 3, completes the spelling between remaining adjacent each prefabricated pier shaft segment
Dress, final entire Bridge Pier Construction are completed.
It is the characteristics of present invention is much higher than normal concrete and conventional grout material using the UTFC strength of materials, longitudinal by reducing
Anchorage length needed for connecting reinforcing bar, the connection effectively reduced needed for the connection of UTFC grout lines is connected with the wet seam of UTFC are long
Degree；Section is removed by the vertical muscle of the longitudinally connected steel-bar arrangement 4d length in the connection of UTFC grout lines, can effectively be avoided
The vertical muscle connection reinforcing bar generates stress between prefabricated cushion cap and prefabricated pier bottom segment and concentrates at Mosaic face, prevent it in Cyclic Loading
Effect is lower to occur fatigue rupture, and the deformation of the longitudinally connected reinforcing bar is expanded to bigger length range, and then extend pier bottom
Areas of plasticity hinge, slow down plastic hinge concentrate extent of the destruction, improve the ductility of the assembled bridge pier system；By in prefabricated cushion cap
Top surface designs shallow grooves to enhance the Shear transfer between prefabricated pier bottom segment and prefabricated cushion cap at Mosaic face；Each prefabricated pier shaft
The support teeth block of segment one or both ends, pours the wet seam connection of UTFC after avoiding and the contact surface of prefabricated pier shaft segment is located completely
In same plane, the Shear transfer of the wet commissural junctions of UTFC can be cooperateed with, and passes through the branch of rotation prefabricated pier shaft segment bottom end
Its verticality can be finely adjusted in prefabricated pier shaft section assembling by holding thick diameter screw pre-buried in tooth block, vertical to ensure
Degree meets design requirement；Guide pad when prefabricated pier shaft section assembling had not only been served as in the setting of the prefabricated guide pad of gypsum material, but also
Act as the internal model poured when the wet seam of UTFC pours, and gypsum material avoids the prefabricated guide pad to bridge pier compared with low-intensity
Holistic resistant behavior has an impact；The UTFC grout lines connection of pier bottom is a kind of ductility connection, which is designed in height
It is surrendered in a manner of ductility under action of horizontal seismic, pier bottom is still nearby potential plastic hinge region；Prefabricated pier shaft is intersegmental
The wet seam connection of UTFC is a very strong connection, and when pier bottom is surrendered under high-level seismic force effects, which is protected
It protects and keeps elasticity；Above-mentioned each detail structure design will ensure that assembled hollow pier system items mechanics proposed by the invention
Characteristic and anti-seismic performance are close with traditional integral cast-in-situ reinforced concrete bridge pier, that is, reach equally cast-in-place performance level, and
The connection of UTFC grout lines is connected with the wet seam of UTFC is all made of pouring for grouting process completion UTFC, easy for construction feasible,
The superior mechanical property of UTFC will ensure that the stabilization of switching performance；Using the construction method of precast assembly, greatly improves and apply
Work efficiency rate shortens construction period, good in economic efficiency, largely saves manpower and material resources.The invention has great
Practical value and good economic benefit especially have broad application prospects in Bridge Pier Construction technical field.
Detailed description of the invention
Fig. 1 is the equivalent cast-in-place assembled hollow pier organigram of the present invention.
Fig. 2 is the layout drawing of segment and prefabricated pier top segment bottom end support teeth block in the prefabricated pier of the present invention.
Fig. 3 is each prefabricated 5 arrangement of reinforcement schematic diagram of pier shaft segment of the present invention.
Fig. 4 is prefabricated 16 structural schematic diagram of pier bottom segment of the present invention.
Fig. 5 is 14 structural schematic diagram of segment in the prefabricated pier of the present invention.
Fig. 6 is that the wet seam of UTFC of the present invention connects prefabricated guide pad 19 and schematic diagram is arranged in exterior sheathing 21.
Fig. 7 is that the wet seam of UTFC of the present invention connects prefabricated guide pad 19 and top view is arranged in exterior sheathing 21.
Fig. 8 is that the wet seam of UTFC of the present invention connects the longitudinally connected use of reinforcing bar 18 overlapped organigram.
Fig. 9 is that the wet seam of UTFC of the present invention connects longitudinally connected reinforcing bar 18 using the organigram of welding.
Figure 10 is that the wet seam of UTFC of the present invention connects longitudinally connected reinforcing bar 18 using the organigram of mechanical connection.
Figure 11 is that the wet seam of UTFC of the present invention connects longitudinally connected reinforcing bar 18 using the organigram of memorial alloy connection.
Wherein: 1, prefabricated cushion cap；2, metal bellows；3, groove；4,UTFC；5, each prefabricated pier shaft segment；6, pier cap；7,
Prefabricated pier top segment；8, thick diameter internal screw thread and bolt；9, steel plate；10, longitudinally connected steel concrete supporting；11, WELDING STUDS；
12, longitudinal reinforcement；13, lateral tie；14, segment in prefabricated pier；15, support teeth block；16, prefabricated pier bottom segment；17, muscle stripping is indulged
From section；18, longitudinally connected reinforcing bar；19, prefabricated guide pad；20, lateral support reinforcing bar；21, exterior sheathing；22, grouting port；23, go out
Starch mouth；24, epoxide-resin glue；25, longitudinally connected bar splicing；26, longitudinally connected reinforcement welding；27, longitudinally connected reinforcing bar note
Recall alloy connection.
Specific embodiment
Embodiment one
As shown in Figure 1, a kind of equivalent cast-in-place assembled hollow pier system, including prefabricated cushion cap 1, in prefabricated cushion cap 1
Portion is embedded with metal bellows 2, top surface setting fluted 3, is provided with each prefabricated pier shaft segment 5 above prefabricated cushion cap 1, each prefabricated
Pier shaft segment 5 includes segment 14 and the prefabricated pier top segment integral prefabricated with pier cap 6 in prefabricated pier bottom segment 16, prefabricated pier
7；
As shown in Figure 2 and Figure 3, prefabricated cushion cap 1 and each prefabricated pier shaft segment 5 be ordinary reinforced concrete it is prefabricated and
At inside is each equipped with longitudinal reinforcement 12 and lateral tie 13, and each prefabricated pier shaft segment 5 is hollow rectangular section；
As shown in Figure 4, Figure 5, each prefabricated 5 both ends or one end of pier shaft segment are equipped with longitudinally connected reinforcing bar 18 and support teeth block
15, the support teeth block 15 of segment 14 and prefabricated 7 bottom end of pier top segment is embedded with thick diameter internal screw thread and bolt 8 in prefabricated pier, in advance
The support teeth block 15 on 14 top of segment is provided with WELDING STUDS 11 and steel plate 9 in pier bottom segment 16 processed and prefabricated pier；
As shown in Figure 6, Figure 7, the bridge pier inner cavity of the wet commissural junctions of UTFC is provided with for each prefabricated pier shaft section assembling
Prefabricated guide pad 19 and lateral support reinforcing bar 20 for supporting prefabricated guide pad 19, prefabricated guide pad 19 is by gypsum material
Prefabricated, section form can be hollow or solid section, and the present embodiment is selected as solid section；
When the longitudinally connected reinforcing bar of the wet commissural junctions of UTFC is mechanical connection processing, the wet seam setting length L of UTFC is pressed
Formula, which calculates, to be determined:
In formula:
D is longitudinally connected bar diameter；
fsFor longitudinally connected reinforced steel bar strength, f is takens=max (1.5fy,fu), wherein fyFor longitudinally connected reinforcement yielding intensity,
fuFor longitudinally connected reinforcing bar ultimate strength；
fUTFCCompression strength is surveyed for ultra-tough fiber concrete (UTFC) material 28d；
α is that longitudinally connected bar diameter size influences coefficient, and when d=12mm, when α=1.0, d=32mm, α=1.2, d are
When between 12~32mm, α value is determined by linear interpolation；
C is that longitudinally connected rebar junction reason influences coefficient, when longitudinally connected reinforcing bar does mechanical connection processing, referring to figure
10, take 0.65；
The construction procedure of the equivalent cast-in-place assembled hollow pier system of above-mentioned the present embodiment are as follows:
Step 1: hoisting prefabricated cushion cap 1 is in place, and hoisting prefabricated pier bottom segment 16 carries out preassembling with prefabricated cushion cap, then
UTFC 4 is perfused into pre-buried metal bellows 3 and groove 3, then prefabricated pier bottom segment 16 is lifted to predetermined position and passed through
Bracket is fixed, and assembly is completed with prefabricated cushion cap 1 in prefabricated pier bottom segment 16；
Step 2: then hoisting prefabricated guide pad 19 lifts adjacent to the cross-brace reinforcing bar 20 of prefabricated pier bottom segment 16
Segment 14 is to prefabricated 16 top of pier bottom segment in prefabricated pier, by prefabricated guide pad 19 and support teeth block 15 and rotation 8
Bolt completes the adjustment of the assembled position in segment 14 in the prefabricated pier and verticality, and by thick diameter internal screw thread and bolt 8
Bolt and steel plate 9 carry out spot welding tentatively to be fixed to segment 14 in the prefabricated pier, then to prefabricated guide pad 19 with connect
Prefabricated 5 inner wall of pier shaft segment between gap carry out the filling sealing of epoxide-resin glue 24, make prefabricated guide pad 19 as UTFC
The internal model of wet commissural junctions；
Step 3: the longitudinally connected reinforcing bar 18 of segment 14 in prefabricated pier bottom segment 16 and contiguous prefabricated pier is done longitudinally connected
The processing of steel concrete supporting 10, referring to Fig.1 0, lateral tie 13 and supporting exterior sheathing 21 are then bound, then fill by grouting port 22
UTFC 4 is infused, until UTFC 4 is emerged from grout outlet 23, is vibrated and is conserved, the wet seam connection of UTFC pours completion, so far
Assembly is completed with segment 14 in contiguous prefabricated pier in prefabricated pier bottom segment 16；
Step 4: being repeated in above-mentioned steps two and step 3, completes the spelling between remaining adjacent each prefabricated pier shaft segment 5
Dress, final entire Bridge Pier Construction are completed.
Embodiment two
As shown in Fig. 1, Fig. 8, a kind of equivalent cast-in-place assembled hollow pier system, including prefabricated cushion cap 1, prefabricated cushion cap
It is embedded with metal bellows 2, top surface setting fluted 3 inside 1, is provided with each prefabricated pier shaft segment 5 above prefabricated cushion cap 1, respectively
Prefabricated pier shaft segment 5 includes segment 14 and the prefabricated pier top integral prefabricated with pier cap 6 in prefabricated pier bottom segment 16, prefabricated pier
Segment 7；
As shown in Figure 2 and Figure 3, prefabricated cushion cap 1 and each prefabricated pier shaft segment 5 be ordinary reinforced concrete it is prefabricated and
At inside is each equipped with longitudinal reinforcement 12 and lateral tie 13, and each prefabricated pier shaft segment 5 is hollow rectangular section；
As shown in Figure 4, Figure 5, each prefabricated 5 both ends or one end of pier shaft segment are equipped with longitudinally connected reinforcing bar 18 and support teeth block
15, the support teeth block 15 of segment 14 and prefabricated 7 bottom end of pier top segment is embedded with thick diameter internal screw thread and bolt 8 in prefabricated pier, in advance
The support teeth block 15 on 14 top of segment is provided with WELDING STUDS 11 and steel plate 9 in pier bottom segment 16 processed and prefabricated pier；
As shown in Figure 6, Figure 7, the bridge pier inner cavity of the wet commissural junctions of UTFC is provided with for each prefabricated pier shaft section assembling
Prefabricated guide pad 19 and lateral support reinforcing bar 20 for supporting prefabricated guide pad 19, prefabricated guide pad 19 is by gypsum material
Prefabricated, section form can be hollow or solid section, and the present embodiment is selected as solid section；
When the longitudinally connected reinforcing bar of the wet commissural junctions of UTFC is overlap joint processing, the wet seam setting length L of UTFC is counted as the following formula
It calculates and determines:
In formula:
D is longitudinally connected bar diameter；
fsFor longitudinally connected reinforced steel bar strength, f is takens=max (1.5fy,fu), wherein fyFor longitudinally connected reinforcement yielding intensity,
fuFor longitudinally connected reinforcing bar ultimate strength；
fUTFCCompression strength is surveyed for ultra-tough fiber concrete (UTFC) material 28d；
α is that longitudinally connected bar diameter size influences coefficient, and when d=12mm, when α=1.0, d=32mm, α=1.2, d are
When between 12~32mm, α value is determined by linear interpolation；
C is that longitudinally connected rebar junction reason influences coefficient, when longitudinally connected reinforcing bar does overlap joint processing, referring to Fig. 8, is taken
1.0；
The construction procedure of the equivalent cast-in-place assembled hollow pier system of above-mentioned the present embodiment are as follows:
Step 1: hoisting prefabricated cushion cap 1 is in place, and hoisting prefabricated pier bottom segment 16 carries out preassembling with prefabricated cushion cap, then
UTFC 4 is perfused into pre-buried metal bellows 2 and groove 3, then prefabricated pier bottom segment 16 is lifted to predetermined position and passed through
Bracket is fixed, and assembly is completed with prefabricated cushion cap 1 in prefabricated pier bottom segment 16；
Step 2: then hoisting prefabricated guide pad 19 lifts adjacent to the cross-brace reinforcing bar 20 of prefabricated pier bottom segment 16
Segment 14 passes through prefabricated guide pad 19 and support teeth block 15 and the thick diameter of rotation to prefabricated 16 top of pier bottom segment in prefabricated pier
Bolt in internal screw thread and bolt 8 completes the adjustment of the assembled position in segment 14 in the prefabricated pier and verticality, and by thick straight
Caliber inner screw thread and bolt in bolt 8 and steel plate 9 carry out spot welding tentatively to be fixed to segment 14 in the prefabricated pier, then to pre-
Gap between guide pad 19 processed and prefabricated 5 inner wall of pier shaft segment to connect carries out the filling sealing of epoxide-resin glue 24, makes prefabricated
Internal model of the guide pad 19 as the wet commissural junctions of UTFC；
Step 3: the longitudinally connected reinforcing bar 18 of segment 14 in prefabricated pier bottom segment 16 and contiguous prefabricated pier is done longitudinally connected
Bar splicing 25 is handled, and referring to Fig. 8, then binds lateral tie 13 and supporting exterior sheathing 21, then be perfused by grouting port 22
UTFC 4 is vibrated and is conserved until UTFC 4 is emerged from grout outlet 23, and the wet seam connection of UTFC pours completion, so far in advance
Assembly is completed with segment 14 in contiguous prefabricated pier in pier bottom segment 16 processed；
Step 4: being repeated in above-mentioned steps two and step 3, completes the spelling between remaining adjacent each prefabricated pier shaft segment 5
Dress, final entire Bridge Pier Construction are completed.
Referring to Fig. 8, Fig. 9, Figure 10, Figure 11, in prefabricated pier bottom segment 16 and contiguous prefabricated pier segment 14 it is longitudinally connected
Reinforcing bar 18, can be in addition to doing other than the mechanical connection of embodiment one is handled, the longitudinally connected bar splicing 25 of embodiment two is handled
27 processing of the longitudinally connected processing of reinforcement welding 26 or the connection of longitudinally connected reinforcing bar memorial alloy is done, is UTFC of the present invention referring to Fig. 9
Wet seam connects longitudinally connected reinforcing bar 18 using the organigram of welding；Figure 11, which is that the wet seam connection of UTFC of the present invention is longitudinal, to be connected
Reinforcing bar 18 is connect using the organigram of memorial alloy connection.
The principle of the present invention and advantage:
Equivalent cast-in-place assembled hollow pier system and its construction method proposed by the present invention are to utilize ultra-tough fiber
The compression strength of concrete (UTFC) material is high, every excellent in mechanical performance, the good advantage with the adhesive property of reinforcing bar, effectively contracts
Length needed for short splicing seams, eliminates in assembled bridge pier technology that stitching portion reinforcing bar connecting structure is multiple between each prefabricated subsection
The disadvantages of miscellaneous, Concrete intensity insufficient and seam poor mechanical property, makes the connection structure of assembled hollow pier by tectonic sieving
Make it is more simple, it is easy for construction feasible, improve the efficiency of Bridge Pier Construction, and ensure that assembled proposed by the invention is hollow
Bridge pier system items mechanical characteristic and anti-seismic performance and plastic hinge behavior are close with traditional integral cast-in-situ reinforced concrete bridge pier, most
Reach equally cast-in-place performance level eventually.
Ultra-tough fiber concrete (UTFC) in the art is a proprietary name, is generally referred in the present invention using milli
Scale particles (aggregate) and the cement-base concrete for adding steel fibre are with respect to for normal concrete, high performance concrete
The more excellent concrete material of another kind of mechanical property, such as Reactive Powder Concrete, very-high performance fiber reinforcement
It is concrete, slip casting fiber concrete, closely knit with rib reinforced composite material etc., but preferably very-high performance steel fiber reinforced concrete or note
Pulp fibres concrete.
Compared with prior art, ultra-tough fiber concrete UTFC is arranged in hollow pier junction in the present invention, in ultra-toughness
Property fiber concrete UTFC in reinforcing bar using overlap joint, welding or mechanical connection, this changed dramatically precast assembly hollow pier
Structure type and working condition, but also technical solution of the present invention has following apparent advantage:
Firstly, ultra-tough fiber concrete of the invention connects the common stress of hollow pier structure, ultra-tough fiber coagulation
The indexs such as stress, the deformation of native UTFC itself are able to satisfy in the requirement of cast-in-place hollow bridge pier structure work；
Secondly, ultra-tough fiber concrete UTFC of the invention increases the rigidity of bridge pier, guarantee linkage section and pier shaft section
The adhesive property of section, improves the cracking resistance and endurance quality of linkage section.
In addition, being to be suitable for hollow pier to connect selected by ultra-tough fiber concrete UTFC in technical solution of the present invention
The proportion connect, composition material different-grain diameter particle form closestpacking with optimal proportion, are not only easy to constructing operation, and energy
Enough guarantee density, improves the anti-seismic performance and erosion resistance and durability in harsh environments of bridge pier.
Linkage section can be hollow after making connection by the value to ultra-tough fiber concrete layer different wall thickness and height
Bridge pier skeleton curve peak value and ductility reach or better than cast-in-place pier stud performance.In conclusion ultra-tough proposed by the present invention is fine
Concrete is tieed up as the wet seam of precast assembly hollow pier, with the rigidity of structure is big, interlayer adhesion is good, durability is good, it is tired to resist
The advantages that labor performance is good has great practical value and good economic benefit, especially leads in hollow pier precast assembly
Domain has broad application prospects.And having anti-seismic performance good, endurance quality is superior, places on segment under precast hollow bridge pier
Gypsum guide pad, and hollow pier upper-lower segment is docked by branch supporting tooth block, muscle is indulged to the stress of pier shaft upper-lower segment
It overlapped, welded or is mechanically connected；Installation template is poured ultra-tough fiber concrete, is subject to after the completion using shaking platform
Jolt ramming；Ultra-tough fiber concrete after pouring is conserved, the demoulding after the mechanical index of concrete reaches design requirement,
Complete entire construction.
Claims (7)
1. a kind of equivalent cast-in-place assembled hollow pier system, it is characterised in that: described prefabricated to hold including prefabricated cushion cap (1)
It is connected with bridge pier above platform (1), bridge pier is assembled by each prefabricated pier shaft segment (5), and each prefabricated pier shaft segment (5) includes prefabricated
Segment (14) and the prefabricated pier top segment (7) integral prefabricated with pier cap (6) in pier bottom segment (16), prefabricated pier.
2. a kind of equivalent cast-in-place assembled hollow pier system according to claim 1, it is characterised in that: described prefabricated
Cushion cap (1) and each prefabricated pier shaft segment (5), which are that ordinary reinforced concrete is prefabricated, to be formed, and inside is each equipped with longitudinal reinforcement
(12) and lateral tie (13), prefabricated cushion cap (1) inside are embedded with metal bellows (2), top surface equipped with groove (3), institute
Stating each prefabricated pier shaft segment (5) is hollow rectangular section, and each prefabricated pier shaft segment (5) both ends or one end are equipped with longitudinally connected
Reinforcing bar (18) and support teeth block (15).
3. a kind of equivalent cast-in-place assembled hollow pier system according to claim 1 or 2, it is characterised in that: described
The support teeth block (15) of segment (14) and prefabricated pier top segment (7) bottom end is embedded with thick diameter internal screw thread and bolt in prefabricated pier
(8), the support teeth block (15) on segment (14) top is provided with WELDING STUDS (11) in the prefabricated pier bottom segment (16) and prefabricated pier
With steel plate (9).
4. a kind of equivalent cast-in-place assembled hollow pier system according to claim 1 or 2, it is characterised in that: described
Completion is connect using ultra-tough fiber concrete (UTFC) grout lines between prefabricated cushion cap (1) and prefabricated pier bottom segment (16) to spell
It connects, splicing is completed using ultra-tough fiber concrete (UTFC) wet seam connection between adjacent each prefabricated pier shaft segment (5),
The bridge pier inner cavity of the wet commissural junctions of UTFC be provided with the prefabricated guide pad (19) for each prefabricated pier shaft section assembling with
And the lateral support reinforcing bar (20) for supporting prefabricated guide pad (19), the prefabricated guide pad (19) is prefabricated by gypsum material,
Section form can be hollow or solid section.
5. a kind of equivalent cast-in-place assembled hollow pier system according to claim 4, it is characterised in that: described
Longitudinally connected reinforcing bar (18) in the wet seam connection of UTFC between adjacent each prefabricated pier shaft segment (5) is overlapped, is welded, machinery connects
It connects or determination is calculated as follows in memorial alloy connection processing, the wet seam connection setting length L of UTFC:
In formula:
D is longitudinally connected reinforcing bar (18) diameter；
fsFor longitudinally connected reinforcing bar (18) intensity, f is takens=max (1.5fy,fu), wherein fyIt is surrendered by force for longitudinally connected reinforcing bar 18
Degree, fuFor longitudinally connected reinforcing bar (18) ultimate strength；
fUTFCCompression strength is surveyed for ultra-tough fiber concrete UTFC material 28d；
α is that longitudinally connected reinforcing bar (18) diameter influences coefficient, and when d=12mm, when α=1.0, d=32mm, α=1.2, d are
When between 12~32mm, α value is determined by linear interpolation；
C is that longitudinally connected reinforcing bar (18) connection processing influences coefficient, when longitudinally connected reinforcing bar overlaps, welds, is mechanically connected, remembers
When recalling alloy connection processing, c takes 1.0,0.5,0.65,0.87 respectively.
6. a kind of equivalent cast-in-place assembled hollow pier system according to claim 4, it is characterised in that: described
Longitudinally connected reinforcing bar (18) in the connection of UTFC grout lines is provided with vertical muscle removing section (17) of 4d length.
7. based on a kind of construction method of equivalent cast-in-place assembled hollow pier system described in claim 1, feature exists
In, comprising the following steps:
Step 1: in place, hoisting prefabricated pier bottom segment (16) and prefabricated cushion cap (1) carry out preassembling to hoisting prefabricated cushion cap (1), so
Backward built-in metal bellows (2) and groove (3) perfusion UTFC (4), then prefabricated pier bottom segment (16) is lifted to predetermined position
And be fixed by the bracket, assembly is completed in prefabricated pier bottom segment (16) and prefabricated cushion cap (1)；
Step 2: the lateral support reinforcing bar (20) of hoisting prefabricated guide pad (19) to prefabricated pier bottom segment (16) then lifts phase
In adjacent prefabricated pier above segment (14) to prefabricated pier bottom segment (16), by prefabricated guide pad (19) and support teeth block (15) and
Thick diameter internal screw thread and bolt (8) complete the adjustment of the assembled position in segment (14) in prefabricated pier and verticality, and by bolt
It is tentatively fixed to carry out to segment in the prefabricated pier that spot welding is carried out with steel plate, then to prefabricated guide pad (19) and the prefabricated pier that connects
Gap between body segment (5) inner wall carries out epoxide-resin glue (24) filling sealing, keeps prefabricated guide pad (19) wet as UTFC
The internal model of commissural junctions；
Step 3: overlapping the longitudinally connected reinforcing bar (18) of segment (14) in prefabricated pier bottom segment (16) and prefabricated pier or
Welding or mechanical connection or memorial alloy connection processing, then bind lateral tie (13) and supporting exterior sheathing (21), then lead to
It crosses grouting port (22) perfusion UTFC (4) to be vibrated and conserved until UTFC (4) emerge from grout outlet (23), the wet seam of UTFC
Connection pours completion, and so far prefabricated pier bottom segment (16) is completed assembled with segment (14) in contiguous prefabricated pier；
Step 4: being repeated in above-mentioned steps two and step 3, completes the spelling between remaining adjacent each prefabricated pier shaft segment (5)
Dress, final entire Bridge Pier Construction are completed.
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| CN111350125A (en) * | 2020-02-28 | 2020-06-30 | 重庆交通大学 | Prefabricated pier and construction method thereof |
| CN111501525A (en) * | 2020-03-26 | 2020-08-07 | 上海市政工程设计研究总院（集团）有限公司 | Prefabricated bridge pier column and bearing platform connecting structure with pier base and construction method thereof |
| CN112853983A (en) * | 2021-01-11 | 2021-05-28 | 山东高速建设管理集团有限公司 | Manufacturing and on-site assembling process of light segment prefabricated bridge pier |
| CN113123221A (en) * | 2020-01-10 | 2021-07-16 | 中国国家铁路集团有限公司 | Prefabricated assembled hollow pier based on UHPC joint and construction method |
| CN113389135A (en) * | 2021-06-17 | 2021-09-14 | 北京工业大学 | Assembled multidirectional energy dissipation pier with three-dimensional serrated racking and fiber concrete grouting |
| CN113668369A (en) * | 2021-09-13 | 2021-11-19 | 江南大学 | Socket type connection structure of prefabricated segment reinforced concrete pier and manufacturing method |
| WO2021237102A1 (en) * | 2020-05-21 | 2021-11-25 | Blaine Miller | Bridge support system |
| CN114263093A (en) * | 2022-01-22 | 2022-04-01 | 郑州大学 | Fully-prefabricated assembled bridge and construction method |
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