CN104452597B - Pier prestressed cap beam with extra length Construction Supporting System in water - Google Patents
Pier prestressed cap beam with extra length Construction Supporting System in water Download PDFInfo
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- CN104452597B CN104452597B CN201410687410.8A CN201410687410A CN104452597B CN 104452597 B CN104452597 B CN 104452597B CN 201410687410 A CN201410687410 A CN 201410687410A CN 104452597 B CN104452597 B CN 104452597B
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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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Abstract
The invention discloses pier prestressed cap beam with extra length Construction Supporting System in a kind of water, this support system includes support, two steel diagonal braces arranged in splayed that support includes being arranged in adjacent two water between pier stud and four steel pipe posts being laid in every water around pier stud；Be connected to pin hinge and bearing thereof in the bottom of each strut, the pin hinged-support of steel diagonal brace bottom is connected with the cushion cap of pier stud in corresponding water by pre-embedded steel slab II；The top of strut and the top of steel pipe post are equipped with horizontal support cover plate, and horizontal support cover plate is fixed with a longitudinal support beam；Being respectively arranged at the two ends with a sandbox at longitudinal support beam, sandbox supports horizontal spandrel girder, fixes many longitudinal distribution beam on horizontal spandrel girder, and all longitudinal distribution beam form the horizontal support face of system.Bearing capacity of the present invention is strong, and stability is high, it is possible to prove-in length is more than 40m, setting height(from bottom) more than 8m, and between pier shaft, in the clear distance overlength water more than 18m, pier capping beam is constructed.
Description
Technical field
The present invention relates to a kind of Coping Construction support system, particularly pier prestressed cap beam with extra length Construction Supporting System in a kind of water.
Background technology
At present, domestic heavy civil, Design of Highway Bridge mostly are two-way six-lane or eight tracks, unidirectional three lanes or Four-Lane Road, and the length of pier stud bent cap is most at below 40m, minority length at more than 40m, the commonly used Support Method of Coping Construction and no rack technique two ways.Support Method is high to the requirement for bearing capacity of ground, and costly, the duration is limited for basement process, constructs careless slightly, can cause support integral sinking, has a strong impact on the construction quality of bent cap, and inapplicable for bridge pier in water；No rack technique construction common are: pre-buried method, crosses method and Hold Hoop method, although bent cap suitable in high pier capping beam and water, but three kinds of methods cut both ways, the advantage of every kind of method all can not take into account guarantee bent cap support system to many-sided overall control requirement such as construction speed, quality and cost.
Industry park, medium ring through street, Suzhou City section engineering Wusongjiang River bridge, for single span double width Simple Supported Steel Truss Bridge, always weigh about 4410t, across footpath 119m, single width width 22.8m, belong to domestic single width width, Suzhou City and Jiangsu Province across footpath, bent cap: long 54.2m, wide 3.6m, high 2.5m, also be domestic same type bridge length, single bent cap gross weight is up to 1300t, under bent cap, between pier stud and pier stud, clear distance is 20.2m, and it is positioned at over-water construction, there is the silt soil strata deep more than 20m in the south of the River, Wusong bank, traditional construction with brackets and no rack technique construction are not all suitable for this engineering.This engineering is very high to the bearing capacity of support, stability requirement simultaneously.And, in the construction of above-mentioned bent cap, in order to avoid concrete contraction distortion and the stress that pier shaft is produced of creeping cause local nodes concrete cracking, need to adopt and push up technique in advance, needing under normal circumstances to set up falsework, carry out basement process on the water and supporting frame is set up, difficulty of construction is big, long in time limit, cost is high.
Summary of the invention
The present invention solves that the technical problem existed in known technology provides pier prestressed cap beam with extra length Construction Supporting System in a kind of water, this support system bearing capacity is strong, stability is high, can prove-in length more than 40m, setting height(from bottom) more than 8m, between pier shaft in the clear distance overlength water more than 18m pier capping beam construction.
The present invention solves that the technical problem existed in known technology is adopted the technical scheme that: pier prestressed cap beam with extra length Construction Supporting System in a kind of water, described bent cap bottom is provided with pier stud at least two water, this support system includes support, two steel diagonal braces arranged in splayed that described support includes being arranged in adjacent two water between pier stud and four steel pipe posts being laid in every described water around pier stud；In corresponding each described water, the bottom of four described steel pipe posts of pier stud is fixed on four corners of the cushion cap of pier stud in this water by pre-embedded steel slab I；Each described steel diagonal brace is provided with two struts, the projection on this support transverse direction facade of the two described struts of each described steel diagonal brace overlaps, and longitudinal pitch is identical with the spacing of longitudinally adjacent two steel pipe posts 1, two described struts of each described steel diagonal brace are by steel structure connection together, pin hinge and bearing thereof it is connected in the bottom of each described strut, the pin hinged-support of described steel diagonal brace bottom is connected with the cushion cap of pier stud in corresponding described water by pre-embedded steel slab II, and described pre-embedded steel slab II is positioned at the outside of the described pre-embedded steel slab I being adjacent to；The top of two the described steel diagonal braces arranged in splayed is connected by lateral connection beam；The top of the top of every described strut and every described steel pipe post such as is equipped with at the horizontal support cover plate of absolute altitude, is fixed with a longitudinal support beam on horizontal support cover plate described in longitudinally opposed each two；All described steel pipe posts and all described steel diagonal braces are linked together by level connection joint component I；
It is respectively arranged at the two ends with a sandbox at many described longitudinal support beam, the sandbox at described longitudinal support beam two ends supports two horizontal spandrel girders respectively, fixing the many longitudinal distribution beam being arranged side by side on two described horizontal spandrel girders, all described longitudinal distribution beam form the horizontal support face of system.
Yu Ding mechanism is installed on the bracket, described Yu Ding mechanism includes relative pre-top steel plate I and pre-top steel plate II, described pre-top steel plate I and described pre-top steel plate II are embedded in adjacent two piece water on the outer surface of pier stud respectively, starting to be provided with pre-top connected horizontally steel pipe, jack and Pressure Block successively from described pre-top steel plate I between described pre-top steel plate I and described pre-top steel plate II, described pre-top steel pipe is connected with described pre-top steel plate I；Described pre-top steel pipe is supported by spacing clamp, and described spacing clamp is fixed in the middle top surface of described longitudinal support beam.
Being welded under inverted U-shaped anchor bar and horizontal stiffener net at described pre-embedded steel slab I and described pre-embedded steel slab II, described horizontal stiffener net is connected with described inverted U-shaped anchor bar.
Described sandbox is made up of the lower sand barrel affixed with described longitudinal support beam and upper piston buttress；Fine sand body it is loaded with in described lower sand barrel；Described upper piston buttress is provided with an inverted staving, has completely built xoncrete structure in described inverted staving；Described inverted staving is inserted in described lower sand barrel, and described upper piston buttress is supported by described fine sand body, is provided with and puts sand mouth on the lower end sidewall of described lower sand barrel, is provided with closure gate described putting on sand mouth.
Described sand mouth of putting is formed by screwed hole, and described closure gate is formed by bolt.
Described inverted staving is provided with outer rim and stretches out the bottom outside this staving, forms buttress top braces cover plate；The bottom outer-edge of described lower sand barrel stretches out outside the staving of described lower sand barrel, forms the bottom support supporting plate of sandbox.
Described pre-embedded steel slab II and the described pre-embedded steel slab I being adjacent to are monoblock steel plates.
Described lateral connection beam, described longitudinal support beam, the component of described steel diagonal brace, described horizontal spandrel girder and described longitudinal distribution beam all adopt Two bors d's oeuveres i-beam structure.
In corresponding each described water, the bottom of four described steel pipe posts of pier stud forms one by level connection joint component II.
The pin hinged-support of described steel diagonal brace bottom adopts horizontal steel plate to be connected with the bottom of the described steel pipe post near this pin hinged-support.
The present invention has the advantage that and has the benefit effect that
1) support adopts the cushion cap of pier stud as impetus, and structure bearing load is transferred to permanent structure, has broken the restriction of pier capping beam Support Method and no rack technique construction in overlength water in current domestic municipal administration and highway bridge field.Pre-embedded steel slab during pier stud bearing platform construction in water, after in water, pier stud has been constructed, steel diagonal brace and steel pipe post are connected on pre-embedded steel slab, pull out the Larsen stake for pier stud and bearing platform construction, steel diagonal brace is forwarded to setting inclination angle, next step construction can be carried out, it is possible to shorten the installation period of bent cap support system, save cost.Reason is in that: utilizes pin hinge structure, makes steel diagonal brace can carry out angle adjustment.Owing to the steel diagonal brace of pier stud working cofferdam Larsen stake with support is to intersect, during mounting bracket, must first extract the Larsen stake of crossover sites.If adopting the erection mode that steel diagonal brace directly welds with cushion cap pre-embedded steel slab, difficulty of construction is big, cushion cap Lijiang River bank has farther out, again underwater obstacle, therefore change into and being connected with cushion cap pre-embedded steel slab at the footing place of steel diagonal brace one articulated structure of increase, use this articulated structure can not be subject to the impact that field environmental condition and Larsen stake intersect, after steel diagonal brace is connected with cushion cap pre-embedded steel slab, adopt the steel wire rope that chain block holds through steel diagonal brace top otic placode to fix with pier stud temporarily, make steel diagonal brace be perpendicular to cushion cap, install according still further to oblique angle after Larsen stake is pulled out.As being not provided with pin hinge turntable, then need entirety to set Larsen pile cofferdam, all pier stud cushion caps are formed the entirety closed.Swivel point is set, part bearing platform construction Larsen stake can be pulled out in advance, decrease entirety simultaneously and set cost and the duration of Larsen stake, shorten the support set-up time, save the lease expenses of Larsen stake.The present invention utilizes existing pier stud cushion cap as the basis of structure, decreases the process procedure of basement process, and steel beam column used by structure can also recycle, it is possible to save great amount of cost.Compared with traditional Support Method and no rack technique, present invention, avoiding construction with brackets ground to be processed or set steel-pipe pile, the shortcoming of bearing capacity and stability deficiency, and adopt shaped steel to support, rigidity is big, bearing capacity is strong, relative no rack technique construction bent cap, avoid pre-buried method, cross method, every defect of Hold Hoop method, on permanent structure pier shaft quality and outward appearance without impact, can prove-in length more than 40m, setting height(from bottom) is more than 8m, between pier shaft, clear distance is more than pier overlength Coping Construction in the water of 18m, and the Coping Construction of non-cylindrical pier stud can be applicable to.
2) system support is that the pre-pushing device of pier stud provides temporary support, decreases the basement process setting up falsework and supporting frame such as sets up at the process procedure, further shorten the duration, reduce labour cost and material cost.
3) utilize sandbox as the support of horizontal spandrel girder, make the support absolute altitude of system to finely tune, improve installation accuracy, and form removal easy construction can be made.Sandbox simple in construction, easy to process, bearing capacity is high, it is possible to is effectively improved efficiency of construction, especially when pier shaft is high pier, utilizes sandbox as the structure of adjustable seats, it is possible to reduction difficulty of construction effectively, improves safety coefficient.The main rapidoprint of sandbox is steel pipe and fine sand, and sandbox volume is little, it is possible to save material, reduce construction cost, and all can reuse at construction end rear box and fine sand, on-the-spot no waste mine residual, while saving cost, moreover it is possible to efficiently reduce the pollution to environment.
In sum, rigidity of the present invention is big, and bearing capacity is strong, it is possible to reduction of erection time, reduction labour cost and material cost, and installation accuracy is high, is the Multifunctional supporting structural system of a reusable edible.
Accompanying drawing explanation
Fig. 1 is the elevation of the present invention；
Fig. 2 is the top view of Fig. 1；
Fig. 3-1 is I-I sectional view of Fig. 1；
Fig. 3-2 is II-II sectional view of Fig. 1；
Fig. 3-3 is III-III sectional view of Fig. 1；
Fig. 3-4 is the A-A sectional view of Fig. 1；
Fig. 4 is the elevation of the cushion cap pre-embedded steel slab I of the present invention and cushion cap pre-embedded steel slab II；
Fig. 5 is the anchor bar structural representation of the cushion cap pre-embedded steel slab I of the present invention and cushion cap pre-embedded steel slab II；
Fig. 6 is the structural representation of the pier stud pre-embedded steel slab of the present invention；
Fig. 7 is the Yu Ding mechanism scheme of installation of the present invention；
Fig. 8 is the top view of Fig. 7；
Fig. 9 is the sandbox front elevation of the present invention.
In figure: 1, steel pipe post；2, pier stud in water；3-1, strut；3-2, steel construction；4, lateral connection beam；5, longitudinal support beam；6, level connection joint component I；7, pre-embedded steel slab I；8, pre-embedded steel slab II；9, level connection joint component II；10, pin hinge；11, pin hinged-support；12, cushion cap；13, horizontal support cover plate；14, Larsen stake；15, cushion cap top layer reinforcing bar；16, horizontal stiffener net；17, inverted U-shaped anchor bar；18, pre-top steel plate I；19, spacing clamp；20, steel pipe is pushed up in advance；21, jack；22, Pressure Block；23, pre-top steel plate II；24, U-shaped anchor bar；25, the vertical steel plate of power transmission；26, axial limiting baffle plate；27, sandbox；27-1, lower sand barrel；27-1-1, sandbox bottom support supporting plate；27-1-2, fine sand body；27-1-3, closure gate；27-2, upper piston buttress；27-2-1, buttress top braces cover plate；27-2-2, xoncrete structure；28, horizontal spandrel girder；29, longitudinal distribution beam；30, bent cap；31, guardrail；32, bed die.
Detailed description of the invention
For the summary of the invention of the present invention, feature and effect can be further appreciated that, hereby enumerate following example, and it be as follows to coordinate accompanying drawing to describe in detail:
Referring to accompanying drawing, pier prestressed cap beam with extra length Construction Supporting System in a kind of water, described bent cap 30 bottom is provided with at least two water pier stud 2, and this support system includes support and upper support structure thereof.
Two steel diagonal braces arranged in splayed that described support includes being arranged in adjacent two water between pier stud 2 and four steel pipe posts 1 being laid in every water around pier stud；In corresponding each described water, the bottom of four described steel pipe posts 1 of pier stud 2 is fixed on four corners of the cushion cap 12 of pier stud 2 in this water by pre-embedded steel slab I 7；Each described steel diagonal brace is provided with two strut 3-1, the two described strut 3-1 of each described steel diagonal brace projection on this support transverse direction facade overlaps, and longitudinal pitch is identical with the spacing of longitudinally adjacent two steel pipe posts 1, two described strut 3-1 of each described steel diagonal brace are linked together by steel construction 3-2, pin hinge 10 and bearing 11 thereof it is connected in the bottom of each strut 3-1, the pin hinged-support 11 of described steel diagonal brace bottom is connected with the cushion cap 12 of pier stud 2 in corresponding described water by pre-embedded steel slab II 8, described pre-embedded steel slab II 8 is positioned at the outside of the described pre-embedded steel slab I 1 being adjacent to, the bottom of described strut 3-1 and the pin hinged-support 11 of described steel diagonal brace bottom are by pin hinge 10 connection, the afterbody cutting with scissors 10 at described pin is provided with annular groove, axial limiting baffle plate 26 it is fitted with in described annular groove, described axial limiting baffle plate 26 is fixed on the pin hinged-support 11 of described steel diagonal brace bottom；The top of two the described steel diagonal braces arranged in splayed is connected by lateral connection beam 4；The top of the top of every described strut 3-1 and every described steel pipe post 2 such as is equipped with at the horizontal support cover plate 13 of absolute altitude, is fixed with a longitudinal support beam 5 on horizontal support cover plate 13 described in longitudinally opposed each two；As the platform that pre-top steel pipe 20 and sandbox 27 are placed；All described steel pipe posts 1 and all described steel diagonal braces are linked together by level connection joint component I 6.
It is respectively arranged at the two ends with a sandbox 27 at many described longitudinal support beam 5, the sandbox 27 at described longitudinal support beam 5 two ends supports two horizontal spandrel girders 28 respectively, fixing the many longitudinal distribution beam 29 being arranged side by side on two described horizontal spandrel girders 28, all described longitudinal distribution beam 29 form the horizontal support face of system.For installing bed die 32 and the guardrail 31 etc. of bent cap.
Described sandbox 27 is made up of the lower sand barrel 27-1 affixed with described longitudinal support beam 5 and upper piston buttress 27-2；Fine sand body 27-1-1 it is loaded with in described lower sand barrel 27-1；Described upper piston buttress 27-2 is provided with an inverted staving, has completely built xoncrete structure 27-2-2 in described inverted staving；Described inverted staving is inserted in described lower sand barrel 27-1, and described upper piston buttress 27-2 is supported by described fine sand body 27-1-1, is provided with and puts sand mouth on the lower end sidewall of described lower sand barrel 27-1, is provided with closure gate described putting on sand mouth.
In the present embodiment, described in put sand mouth and formed by screwed hole, described closure gate is formed by bolt 27-1-3.Described inverted staving is provided with outer rim and stretches out the bottom outside this staving, forms buttress top braces cover plate 27-2-1；The bottom outer-edge of described lower sand barrel 27-1 stretches out outside the staving of described lower sand barrel, form the bottom support supporting plate 27-1-2 of sandbox, so that with bolts with longitudinal support beam 5, the horizontal level making sandbox 27 is adjustable, makes sandbox 27 repeatedly repetitive cycling to utilize.
In the present embodiment, the cross section of middle pier stud is oval.14 long 18m of pier stud working cofferdam Larsen stake, if riverbed top mark height is 0.00m, then water surface absolute altitude is 1.5m, and pier stud cushion cap top mark height is-2.8m.For convenient construction, save cost, Yu Ding mechanism is arranged on above-mentioned support, described Yu Ding mechanism includes relative pre-top steel plate I 18 and pre-top steel plate II 23, described pre-top steel plate I 18 and described pre-top steel plate II 23 are embedded in adjacent two piece water on the outer surface of pier stud 2 respectively, between described pre-top steel plate I 18 and described pre-top steel plate II 23, start to be provided with pre-top connected horizontally steel pipe 20 successively from described pre-top steel plate I 18, jack 21 and Pressure Block 22, described pre-top steel pipe 20 is connected with described pre-top steel plate I 18, jack 21 and Pressure Block 22 are installed between the other end and described pre-top steel plate II 23 of described pre-top steel pipe 20, described jack 21 is between described pre-top steel pipe 20 and described Pressure Block 22.Before implementing the operation of pre-top, jack 21 and Pressure Block 22 hang from the horizontal support face of system.Described pre-top steel pipe 20 is supported by spacing clamp 19, and described spacing clamp 19 is fixed in the middle top surface of described longitudinal support beam 5.
Pier stud is applied pre-jacking force, if directly contacting, jack head is little with pier stud contact surface, stress is concentrated, there is the possibility of Local Cracking, therefore in the front of jack 21, it is provided with Pressure Block 22 and pre-top steel plate II 23, in like manner, at end arranged outside pre-top steel plate I 18 away from jack 21 of pre-top steel pipe 20, described pre-top steel plate I 18 is identical with described pre-top steel plate II 23 structure, all include curved plate one piece adaptive with pier stud in water 2 outer surface, it is welded with U-shaped anchor bar 24 at the back side of curved plate, the opening direction of described U-shaped anchor bar 24 is identical with the opening direction of described curved plate, the hook arrangement of two varuss it is provided with in the bottom of described U-shaped anchor bar 24.The effect of described hook arrangement is similar with the effect of tube expansion.Described pre-top steel plate I 18 and described pre-top steel plate II 23, by welding anchor rib, reach the effect of diffusion concentrated stress.Described Pressure Block 22 includes the vertical steel plate 25 of power transmission, and the vertical steel plate of described power transmission 25 is connected with described pre-top steel plate II 23 by steel attachment structure II.When carrying out pre-top construction, in order to prevent producing to pollute to pier stud, geotextiles is adopted to wrap up the neighboring area of described pre-top steel plate I 18 and described pre-top steel plate II 23.
Pre-ejection device uses the support of bent cap support system as temporary support, install and push up steel pipe, Pressure Block in advance, pre-top steel pipe utilizes spacing clamp and support to fix, decrease the basement process individually doing temporary support and supporting frame such as sets up at the process procedure, can the reduction of erection time, reduce labour cost and material cost.
Steel pipe post 1 pressure-bearing, bottom and cushion cap 12 connecting portion local compression, steel diagonal brace bottom-hinged node and cushion cap 12 connecting portion pressurized shearing resistance, therefore below pre-embedded steel slab I 7 with pre-embedded steel slab II 8, weld inverted U-shaped anchor bar 17 be connected with cushion cap permanent structure, and three levels stiffener net 16 is provided below at pre-embedded steel slab I 7 and pre-embedded steel slab II 8, described horizontal stiffener net 16 is positioned at the lower section of cushion cap top layer reinforcing bar 15, is connected respectively with reinforcing bar in inverted U-shaped anchor bar 17 and cushion cap.The vertical muscle of welded steel fabric and horizontal bar form network structure, good with concrete binding anchoring, the uniform load diffusion profile born, it is possible to significantly improve the shatter resistant performance of reinforced concrete structure.Concrete crack can be reduced, it is possible to increase shear resistance and local Compressive Bearing Capacity.Described steel diagonal brace is positioned at the outside of the described steel pipe post 1 being adjacent to, and described pre-embedded steel slab II 8 and the described pre-embedded steel slab I 7 being adjacent to are monoblock steel plates, to further facilitate construction.For the stability of reinforcement structure, the pin hinged-support of described steel diagonal brace bottom adopts horizontal steel plate to be connected with the bottom of the described steel pipe post near this pin hinged-support.In order to when meeting structural strength and rigidity, alleviate construction weight, described lateral connection beam 4, described longitudinal support beam 5, the component of described steel diagonal brace, described horizontal spandrel girder 28 and described longitudinal distribution beam 29 all adopt Two bors d's oeuveres i-beam structure.In order to further enhance the rigidity of structure, in corresponding each described water, the bottom of four described steel pipe posts 1 of pier stud 2 forms one by level connection joint component II 9.Connect reliable in order to ensure steel pipe post 1 and pre-embedded steel slab I 7, be provided with the gusset of putting more energy into welded with described pre-embedded steel slab I 7 in the bottom of described steel pipe post 1.By M shape steel structure connection together, easy construction, structure is reliable for two described strut 3-1 of each described steel diagonal brace.
In sum, the present invention is pre-embedded steel slab when bearing platform construction, steel pipe post and steel diagonal brace hinged joint are welded on pre-embedded steel slab, pull out and rotate steel diagonal brace after the local Larsen stake of bearing platform construction to specified angle, take the fixing steel diagonal brace of structure of welding lateral connection beam, the support being strengthened horizontal direction by weld horizontal connecting elements is connected, longitudinally opposed steel pipe post and steel diagonal brace fix longitudinally connected beam respectively, the fixing pre-spacing clamp pushing up steel pipe in the middle part of many longitudinally connected beams, the pre-ejection device for pier stud provides temporary support；At the two ends of many longitudinally connected beams difference tight flask, it is used for supporting two horizontal spandrel girders, two horizontal spandrel girders are fixed many longitudinal distribution beam, form the horizontal support face of system.The present invention is the Multifunctional supporting structural system of a reusable edible.
This structural system formed by steel pipe post and steel diagonal brace undertakes the vertical load that bent cap is conducted oneself with dignity and construction loads transmits, and is transferred to by active force on permanent structure cushion cap foundation, and permanent structure impact is less, and structure stress is uniform, supports firm.And this structural system, it is possible to solve well other strutting system due to steel-pipe pile bear vertical load and by with the frictional force effect in riverbed under cause steel-pipe pile to lengthen thus the phenomenon that causes base fixed performance not enough.Deep suitable in silt soil strata, when being not added with long support height, meet the requirement of bearing capacity.Additionally, cover plate is supported in steel pipe post top weld horizontal, one be can when single-point lifts by crane for steel wire hang around, two is to increase contact area, enables the active force transmitted from top vertically to pass to steel pipe post uniformly through horizontal support cover plate.
Support is arranged and pushes up steel pipe in advance, apply pre-jacking force by jack pair pier shaft, it is possible to avoid super long mass bent cap concrete contraction distortion and Creep Effect that the stress that pier shaft produces is caused local nodes concrete cracking.Pre-jacking force welds steel beam column after having loaded between pre-top steel pipe with pre-top steel plate II, unloading jack and Pressure Block, pre-jacking force is transferred on steel beam column, pre-jacking force can pass through the steel pipe transmission of pre-top, act in about the 1m scope of below pier stud top, pier shaft top is made to bear pre-jacking force, it is possible to tension pier top produced with overlength bent cap mass concrete shrinkage stress is cancelled out each other, to avoid node to crack and to ftracture.Push away steel pipe in advance and need to wait until that bent cap has built that to reach design strength rear dismountable.
It is arranged on the lower fulcrum as horizontal spandrel girder of the sandbox on node location, absolute altitude scalable, support installation process can be prevented effectively from error occurs, after this external Coping Construction completes, transferring of horizontal spandrel girder can be completed by the whereabouts (10～20cm) of sandbox, reserve bed die and remove space, be beneficial to striking job.
Sandbox for adjusting elevation, first need to select the engineering sand of function admirable, and dry, sandbox need to carry out load-carrying properties test in advance, the load born according to work progress carries out precompressed, obtain relevant parameter by testing, it is determined that sand consumption and the closely knit height reduction caused of sand self extrusion after loading, during construction, this height need to be reserved according to this parameter.Sand is produced extruding force mainly through pressure-bearing by sandbox operation principle, sandbox pressure-bearing behind the hole that tights a bolt, and lays down the bolt on bolt hole, with the sand manually drawn out in sandbox, reduces the effect of absolute altitude.
Adjustable absolute altitude sandbox, effect is similar to jack.A set of support system amounts to 20, and for ensureing each sandbox uniform force, between pier stud, (within the scope of single span), sandbox spacing on average presses 6.06m layout, fills the compressed value after engineering sand according to sandbox stressing conditions and sandbox.Determine compressed value, reserved compression height, accurately adjust sandbox top mark high, reach to control the purpose of bent cap bed die height.When removing bed die, first lay down bolt, with the sand manually drawn out in sandbox, reach the purpose of overall whereabouts, thus reserving bed die to remove space.
Sandbox falls frame means as the important transmission member of whole strutting system and form removal, it is considered as the bearing of horizontal spandrel girder, during construction, single sandbox bearing load is at more than 130t, therefore need to control plane deviation, plane net when keeping the adjustable sandbox of multiple spot to install is accurate, avoid changing support force system, cause system unstability.Need 20 sandboxes after installing are carried out bracing wire measurement and adjusted, it is ensured that absolute altitude is consistent, and on the same line, plane deviation is less than 1cm for centrage.For guaranteeing construction safety, using before sandbox, randomization is done experiment on 150t forcing press, checking sandbox stressing conditions and sandbox fill engineering sand after compressed value (normal sand is about 1cm, and engineering yellow ground is up to 2cm).According to the compressed value that test is determined, reserved compression height, accurately adjust sandbox top mark high, reach to control the purpose that bent cap bed die height is smooth.
Although the preferred embodiments of the present invention being described above in conjunction with accompanying drawing; but the invention is not limited in above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is merely schematic; it is not restrictive; those of ordinary skill in the art is under the enlightenment of the present invention; without departing under present inventive concept and scope of the claimed protection situation, it is also possible to making a lot of form, these belong within protection scope of the present invention.
Claims (10)
1. pier prestressed cap beam with extra length Construction Supporting System in a water, described bent cap bottom is provided with pier stud at least two water, it is characterized in that, this support system includes support, two steel diagonal braces arranged in splayed that described support includes being arranged in adjacent two water between pier stud and four steel pipe posts being laid in every described water around pier stud；In corresponding each described water, the bottom of four described steel pipe posts of pier stud is fixed on four corners of the cushion cap of pier stud in this water by pre-embedded steel slab I；Each described steel diagonal brace is provided with two struts, the projection on this support transverse direction facade of the two described struts of each described steel diagonal brace overlaps, and longitudinal pitch is identical with the spacing of longitudinally adjacent two steel pipe posts 1, two described struts of each described steel diagonal brace are by steel structure connection together, pin hinge and bearing thereof it is connected in the bottom of each described strut, the pin hinged-support of described steel diagonal brace bottom is connected with the cushion cap of pier stud in corresponding described water by pre-embedded steel slab II, and described pre-embedded steel slab II is positioned at the outside of the described pre-embedded steel slab I being adjacent to；The top of two the described steel diagonal braces arranged in splayed is connected by lateral connection beam；The top of the top of every described strut and every described steel pipe post such as is equipped with at the horizontal support cover plate of absolute altitude, is fixed with a longitudinal support beam on horizontal support cover plate described in longitudinally opposed each two；All described steel pipe posts and all described steel diagonal braces are linked together by level connection joint component I；
It is respectively arranged at the two ends with a sandbox at many described longitudinal support beam, the sandbox at described longitudinal support beam two ends supports two horizontal spandrel girders respectively, fixing the many longitudinal distribution beam being arranged side by side on two described horizontal spandrel girders, all described longitudinal distribution beam form the horizontal support face of system.
2. pier prestressed cap beam with extra length Construction Supporting System in water according to claim 1, it is characterized in that, Yu Ding mechanism is installed on the bracket, described Yu Ding mechanism includes relative pre-top steel plate I and pre-top steel plate II, described pre-top steel plate I and described pre-top steel plate II are embedded in adjacent two piece water on the outer surface of pier stud respectively, starting to be provided with pre-top connected horizontally steel pipe, jack and Pressure Block successively from described pre-top steel plate I between described pre-top steel plate I and described pre-top steel plate II, described pre-top steel pipe is connected with described pre-top steel plate I；Described pre-top steel pipe is supported by spacing clamp, and described spacing clamp is fixed in the middle top surface of described longitudinal support beam.
3. pier prestressed cap beam with extra length Construction Supporting System in water according to claim 1, it is characterized in that, being welded under inverted U-shaped anchor bar and horizontal stiffener net at described pre-embedded steel slab I and described pre-embedded steel slab II, described horizontal stiffener net is connected with described inverted U-shaped anchor bar.
4. pier prestressed cap beam with extra length Construction Supporting System in water according to claim 1, it is characterised in that described sandbox is made up of the lower sand barrel affixed with described longitudinal support beam and upper piston buttress；Fine sand body it is loaded with in described lower sand barrel；Described upper piston buttress is provided with an inverted staving, has completely built xoncrete structure in described inverted staving；Described inverted staving is inserted in described lower sand barrel, and described upper piston buttress is supported by described fine sand body, is provided with and puts sand mouth on the lower end sidewall of described lower sand barrel, is provided with closure gate described putting on sand mouth.
5. pier prestressed cap beam with extra length Construction Supporting System in water according to claim 4, it is characterised in that described in put sand mouth and formed by screwed hole, described closure gate is formed by bolt.
6. pier prestressed cap beam with extra length Construction Supporting System in water according to claim 4, it is characterised in that described inverted staving is provided with outer rim and stretches out the bottom outside this staving, forms buttress top braces cover plate；The bottom outer-edge of described lower sand barrel stretches out outside the staving of described lower sand barrel, forms the bottom support supporting plate of sandbox.
7. pier prestressed cap beam with extra length Construction Supporting System in water according to claim 1, it is characterised in that described pre-embedded steel slab II and the described pre-embedded steel slab I being adjacent to are monoblock steel plates.
8. pier prestressed cap beam with extra length Construction Supporting System in water according to claim 1, it is characterized in that, described lateral connection beam, described longitudinal support beam, the component of described steel diagonal brace, described horizontal spandrel girder and described longitudinal distribution beam all adopt Two bors d's oeuveres i-beam structure.
9. pier prestressed cap beam with extra length Construction Supporting System in water according to claim 1, it is characterised in that in corresponding each described water, the bottom of four described steel pipe posts of pier stud forms one by level connection joint component II.
10. pier prestressed cap beam with extra length Construction Supporting System in water according to claim 1, it is characterised in that the pin hinged-support of described steel diagonal brace bottom adopts horizontal steel plate to be connected with the bottom of the described steel pipe post near this pin hinged-support.
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| CN201410687410.8A CN104452597B (en) | 2014-11-25 | 2014-11-25 | Pier prestressed cap beam with extra length Construction Supporting System in water |
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| CN104452597B true CN104452597B (en) | 2016-06-29 |
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| CN106223207A (en) * | 2016-09-13 | 2016-12-14 | 中国建筑土木建设有限公司 | Bridge bent cap does not have and falls to ground support strutting arrangement and relevant support piece |
| CN108589516A (en) * | 2018-07-05 | 2018-09-28 | 北京市市政工程设计研究总院有限公司 | A kind of bridge elasticity support system of self-supporting steel structure |
| CN110004832B (en) * | 2019-04-09 | 2024-03-05 | 宁波市政工程建设集团股份有限公司 | Large-span cantilever truss type bent cap bracket system and construction method |
| CN109944165A (en) * | 2019-04-24 | 2019-06-28 | 中铁二十四局集团有限公司 | A kind of temporary support method of the modularization regulating posture for the installation of prefabricated bent cap |
| CN110144829A (en) * | 2019-06-20 | 2019-08-20 | 中国五冶集团有限公司 | A kind of support construction being used to support bowstring arch bridge main structure |
| CN110820574A (en) * | 2019-11-07 | 2020-02-21 | 上海建工七建集团有限公司 | Inclined sand box device and mounting and dismounting method thereof |
| CN113073555B (en) * | 2021-03-19 | 2022-08-12 | 中铁大桥局集团第四工程有限公司 | Pier top block positioning system and construction method thereof |
| CN113431183B (en) * | 2021-06-30 | 2022-07-15 | 机械工业第六设计研究院有限公司 | Installation method of gallery truss with connected structure |
| CN113585076A (en) * | 2021-07-08 | 2021-11-02 | 中国建筑第六工程局有限公司 | Construction method of overwater large-span double-layer cast-in-place beam |
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