CN205035732U - Interim support of combined type bridge - Google Patents
Interim support of combined type bridge Download PDFInfo
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- CN205035732U CN205035732U CN201520773855.8U CN201520773855U CN205035732U CN 205035732 U CN205035732 U CN 205035732U CN 201520773855 U CN201520773855 U CN 201520773855U CN 205035732 U CN205035732 U CN 205035732U
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Abstract
The utility model discloses an interim support of combined type bridge, be in including the open wood system sand box in top, packing in the wood system sand box and have mobile dry sand, vertical embedding steel pipe in the dry sand is placed the steel pipe top just is higher than the concrete support column at wood system sand box top, wherein the bottom of steel pipe is reserved there is the clearance hole, the rubber pad has been placed at the top of concrete support column, and the interim support cost of manufacture of this bridge is low, ann tears open fastly, can have enough to meet the need the use many times, and safety and stability, cooperation " T " style of calligraphy beam slab quick astrofix can realize bridge installation disposable accurate taking one's place, and application effect is good in practical application.
Description
Technical field
The utility model relates to road and bridge construction technical field, is specifically related to a kind of bridge temporary support.
Background technology
Simple-supported thencontinuous bridge is the widely used type of bridge of China, and namely beam body adopts concentration pre-casting in precasting yard, erected on site, can mechanical performance be given full play to, effectively raise labour efficiency, save a large amount of template and support, thus accelerating construction progress, reduce construction cost.Can construct in this structure top and the bottom of simple-supported thencontinuous bridge simultaneously, progress is fast, the construction method of what superstructure adopted is simply supported beam, and what obtain is but the more excellent continuous beam of structure.In highway in China is built, the continuous girder bridge being 20-45m across footpath have employed this structure in a large number.It is generally acknowledged that simple-supported thencontinuous bridge its technology Focal point and difficult point in work progress carries out system transform, and the selection of bridge temporary support and use be guarantee system conversion can successfully key.Bridge temporary support conventional at present has steel sand cylinder bridge temporary support, concrete bearing, plancon bridge temporary support, sulphur-bonded mortar bridge temporary support etc.Widely used in large and medium-sized bridge is sulphur-bonded mortar bridge temporary support, steel cylinder sand box temporary support.
1, sulphur-bonded mortar bridge temporary support: its operating principle inserts heating wire in advance in sulphur-bonded mortar, removes bridge temporary support by electric heating thawing sulphur-bonded mortar and completes system transform.Sulphur-bonded mortar is with sulfur smoke adhesive material, disastrously enters the heating of cement, fine sand and thickener mix to forming by proper proportion, general adopts industrial fusing point to be 113 DEG C, or adds naphthalene, paraffin etc. to improve its fragility, workability improve tensile strength.Sulphur-bonded mortar bridge temporary support build in preset heating wire and wiring terminal.During Simply supported non-uniform off-load, sulphur-bonded mortar cushion block is melted distortion by the heat allowing heating wire produce that is energized, thus reaches the object of off-load.
The shortcoming of sulphur-bonded mortar bridge temporary support is:
In a, sulphur-bonded mortar cooling curing process, usually surface produces cracking, and abutment surface out-of-flatness, stress is caused to concentrate after easily causing beam, bridge temporary support is cracked, the resistance wire of inserting likely is broken, cause bridge temporary support to be energized and soften fault, and easily cause " three leg " phenomenon;
B, sulphur-bonded mortar technique are more complicated, boil in process to produce Sulfur Dioxide On Human health and cause damage, and there is inevitable potential safety hazard when energising is melted, and the disadvantage easily permanent bearing being caused damage and polluted in melting process;
C, sulphur-bonded mortar bridge temporary support are tight to technological requirement, build or prefabricated after, absolute altitude of setting a roof beam in place is difficult to adjustment;
Easy fracture of wire in heating wire galvanization in d, sulphur-bonded mortar bridge temporary support, causes bridge temporary support to dismantle difficulty, so, does not reach the synchronism of system transform.
2, steel sand cylinder temporary support: steel sand box temporary support is the dry fine sand utilized in steel closed container, easily flows out when container bottom or side opening opening thus reduces the principle design of the fine sand volume in container.It is by containing fine sand at the container of a top-open, the cylindrical steel cushion block that one piece is slightly less than upper opening of container is put at upper, making it exceed upper opening of container 2 ~ more than 3cm (certain upper opening of container will lower than permanent bearing elevation) crossbeam is placed on cushion block, during Simply supported non-uniform off-load, sand is released at sandbox lateral opening place, in container, sand volume reduces, and crossbeam drops on permanent bearing thereupon.
The shortcoming of steel sand box temporary support:
Steel sand box temporary support bearing technique is comparatively complicated, needs mass customized when Normalization rule, and labor intensive amount is comparatively large, and need steel beam comparatively large, when volume of the circular flow is less, use cost is higher.
Steel sandbox sand outlet generally adopts timber wedge or screw sealing, there will be the situation of sealing and dropping, cause sand to spill, cause the quality accident that beam slab sinks in work progress.
3, some bridge temporary supports of other form of structure can also be used at the construction field (site), as wooden sand box temporary support etc., but these bridge temporary supports be generally used for foot bridge or the less less demanding bridge of bridge temporary support demand or other relief arrangements, exist reliability not high, remove the synchronism problem that difficulty maybe cannot ensure off-load.
Utility model content
The technical problems to be solved in the utility model is: propose a kind ofly to be convenient to install, the pollution-free and combined type bridge temporary support that support effect is good.
The utility model is the technical scheme solving the problems of the technologies described above proposition: provide a kind of combined type bridge temporary support, comprise the wooden sandbox of open top, be filled in described wooden sandbox and have mobility dry sand, be vertically embedded in steel pipe in described dry sand, to be placed on above described steel pipe and higher than the concrete support post of described wood sand box top, the bottom of wherein said steel pipe is reserved with clearance hole, and the top of described concrete support post is placed with rubber pad.
Further, the outer wall of described wooden sandbox is with stiffener, steel pipe, sand, concrete block, wooden sandbox combine load-bearing simultaneously.
Further, described wooden sandbox outside indicates the perforate corresponding with described clearance hole position and marks, and support column is concrete block.
The beneficial effects of the utility model are:
The utility model solves the resistance to compression stability of existing highway bridge temporary support, poor durability, peace tear inconvenience, high cost problem open.Test is utilized to carry out compression test to combined type bridge temporary support sample, through detailed calculating and contrast, for construction provides theoretical foundation.By optimizing wooden case preparation method, solve the key technologies such as wooden sandbox side loaded stability problem, the bridge temporary support of steel, wood, Combined concrete is innovatively proposed, namely in square wooden case, add the steel pipe with holes of corresponding size, make full use of the mobility of dry sand and the strong feature of anti-pressure ability, lateral pressure after the pressurized of dry sand is passed to steel pipe inner wall, solves the problem of wooden sandbox anti-pressure ability difference.Achieve good effect in actual applications.In addition, in the utility model, combined type bridge temporary support structure is simple, easy for installation.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, bridge temporary support of the present utility model is described further.
Fig. 1 is the structural representation of combined type bridge temporary support in the utility model;
Fig. 2 is the decomposition texture schematic diagram of combined type bridge temporary support in the utility model;
Fig. 3 is the structure sectional view of combined type bridge temporary support in the utility model;
The computation model that Fig. 4 adopts when being steel pipe sizes checking computations;
Fig. 5 is the graph of relation of unit pressure and distortion.
In figure, wooden sandbox 1; Concrete support post (or claiming " concrete block ") 2; Seamless steel pipe 3; Clearance hole 4; Stiffener 5; Perforate mark 6; Dry sand 7; Rubber pad 8; Mortar 9; Fill dry sand 10.
Detailed description of the invention
Embodiment one
According to Fig. 1-2, combined type bridge temporary support in the utility model comprise open top wooden sandbox 1, be filled in wooden sandbox 1 and have mobility dry sand 7, be placed in wooden sandbox 1 and the concrete support post 2 that stretches out from wooden sandbox 1 open top of top, also comprise the steel pipe 3 be vertically embedded in dry sand 7, the bottom of steel pipe 3 is reserved with clearance hole 4, and can be used as preferably steel pipe is seamless steel pipe 3.The top of concrete support post 2 is placed with rubber pad 8, and the thickness that can be used as preferably rubber pad 8 is 2mm, and the size length of side of rubber pad 8 is greater than the length of side 3-4cm of concrete block.
Wherein, wooden sandbox 1 is made up of phenolic resins composite board.
Can be used as preferably: the outer wall of wooden sandbox 1 is with stiffener 5, and stiffener 5 adopts the lumps of wood to make.
Can be used as preferably: wooden sandbox 1 outside indicates the perforate relative with clearance hole 4 position and marks 6, and support column 2 is concrete support post 2.
Embodiment two
Certain bridge in the present embodiment, adopts Class I highway technical standard, total length 306m, four holes one, totally three, top employing 25m prestressing force small box girder, simple-supported thencontinuous, utilizes embodiment one Bridge temporary support to carry out the construction method of continuous beam erection, comprises the following steps:
1, material prepares
Select the existing leftover pieces in job site, the lumps of wood, bamboo wooden form, wall thickness 5-8mm diameter 14-20cm steel pipe 3, high-grade concrete support column 2, uniform drying fine quartz sand, wooden sandbox 1 girth member, the 2mm rubber pad 8(rubber pad size length of side are greater than concrete block 3-4cm) etc.
2, combined type bridge temporary support design
Carry out according to bridge type design and construction demand during the design of combined type bridge temporary support, main consideration beam slab deadweight, working load, other load sums, consider Installation of beam slab technique simultaneously, the maximum deadweight of beam slab of certain bridge is 720KN, consideration working load is 100KN, other loads are 50KN, and every sheet case beam adopts 4 combined type bridge temporary supports, so each bridge temporary support maximum load is (720KN+100KN+50KN)/4=217KN.
1) concrete support post 2 size design
Concrete crushing strength MPa=test specimen rupture load (N)/test specimen bearing area (mm2);
Concrete crushing strength MPa=217000/1502=9.6Mpa;
Concrete support post 2 in the present embodiment adopts C50 concreting to make, be of a size of 150mm × 150mm × 150mm, compressive strength > 50Mpa, ultimate load > 1125KN, so adopt concrete support post 2 safety factor of 150mm × 150mm × 150mm larger, after bridge temporary support is installed, can not there is destructive damage in concrete support post 2.
2) seamless steel pipe 3 type selecting and forcing checking
At the bottom of certain Bridge Construction plan middle cover back to beam, height is 25cm.Steel pipe 3 selects nonstandard internal diameter to be 146mm, and wall thickness is 8mm seamless steel pipe 3, and external diameter is 162mm.
As shown in Figure 4, model is carried out simplifying and Force Calculation is carried out to steel pipe 3:
D0---the internal diameter of concrete support post 2, value 0.146m;
D1---steel pipe 3 external diameter, value 0.166m;
H0---concrete support post 2 puts into the lower sand cylinder degree of depth from most high workload position, and sand decrement measures according to test, gets 0.02m;
H---descent altitude, according to compression test, sand decrement measures according to test, and sand largest amount of subsidence is 0.03m;
The wall thickness of σ---seamless steel pipe 3, value is 0.005m;
[σ]---sand allows bearing capacity, by its precompressed, can reach 60MPa(test value);
Steel pipe forcing checking
Look into GB, for the yield strength of slotless design steel pipe 3, by δ=5mm≤22mm, then [σ] steel pipe 3=245MPa.
Get H=0.05m, d2=0.02m, h0=0.09m.
Again, stress in the barrel wall is
I.e. σ=219MPa < [σ] steel pipe 3=245MPa, steel pipe 3 sidewall is stressed to meet the demands.
In the present embodiment, combined type bridge temporary support requires that setting height(from bottom) is 250mm, wooden sandbox 1 inside dimension is the length of side × length of side × height=165mm × 165mm × 160mm, 150mm × 150mm × 150mm concrete support post 2 is inserted wooden sandbox 15cm, steel pipe 3 is highly 7cm, steel pipe 3 pushes up reserves 30mm spacing (as drop-out value during off-load, be convenient to bridge temporary support and remove) with concrete support post 2 end self-inspection.
Temporary support preset height when installing according to bridge beam slab, according to sand there being side limit compression test, drawing the pressure-decrement relation under sand status under loading, drawing the regression equation of working load and compressed value.
Such as: before sand pressurized, preset thickness is that 150mm carries out temporary support compression test, the relation curve of unit pressure and sex change is drawn according to test, as shown in Figure 5.
Regression equation is:
L is sand decrement, unit mm;
P is unit area pressure, units MPa;
As, the single bearing load of Installation of beam slab bearing is 500KN, and concrete block is 150mm × 150mm × 150mm, required temporary support compressive strength p after load-bearing,
Therefore
, 22.5mm is decrement, as follows according to the relation equation derivation of equation drawn with upper curve between compressed value and pressure:
Draw
L0 is unit thickness sand decrement, unit mm;
L is thickness before unit thickness sand compression, unit mm;
So suppose that temporary support is when load-bearing 500KN, needs the thickness in temporary support after sand load-bearing to be set as L0, draws:
L0=L-l0=6.6667×l0-l0=5.666×l0；
l0=L0/5.666；
L0 is that sand presets (under non-load-bearing nature) thickness, unit mm;
Such as: when L0 is set as 70mm, so, sand is preset the thickness before compression (sand is nature, inserts wooden case sand no longer till natural flow, before concrete column is installed, generally not manual compaction) and is:
3, combined type bridge temporary support manufacture and installation
1) wooden sandbox 1 makes
According to above calculating, steel pipe 3 diameter is 162mm, and wooden sandbox 1 adopts the thick composite board of 15mm, 4cm × 8cm lumps of wood, 5cm iron nail, 7 font angle bar stiffener compositions.
Wooden sandbox 1 adopts 15mm composite board, and in addition 30mm × 60mm lumps of wood 5cm iron nail is reinforced, and upper and lower side adopts 90mm × 90mm angle bar again to reinforce, and wooden sandbox 1 adopts 15mm composite board back cover, and bottom fine gap adopts cement paste shutoff tight.
The size of wooden sandbox 1 can be determined according to beam slab load, requires height, on-the-spot physical condition and determine according to different loads, beam slab form, bridge temporary support, guarantees that entirety is stressed and meets safety requirements.
2) concrete support post 2 makes
According to the feature of this engineering, adopt 150mm × 150mm × 150mm concrete support post 2 to meet size and force request, this engineering adopts standard plastic die trial to build shaping, adopts C50 concrete, batch making, and the demoulding is placed on mark and supports room maintenance 28 days.In order to concrete support post 2 sinks, its sidewall is wiped with thin layer butter.
Concrete block size is determined according to the design of bridge temporary support, and standard die trial or wooden model can be adopted to build, template smooth bright and clean, dimensional errors is little, for load less can adopt 100mm × 100mm × 100mm standard die trial.
3) built-in steel pipe 3 making
Steel pipe 3 internal diameter that the present embodiment adopts is 146mm, and wall thickness is 8mm coating steel pipe 3, and steel pipe 3 adopts toothless saw to be cut into pieces, bottom cutting clearance hole 4.When steel pipe 3 is arranged in wooden sandbox 1, by square hole outside bent cap, and carry out mark in the relevant position in hole, be convenient to perforate off-load.
During installation, ensure that the axle center of wooden sandbox 1, steel pipe 3 and concrete support post 2 is identical.
4) fine quartz sand loads and concrete block installation
Have certain quality requirement to the sand of 1 li, wooden sandbox, sand is fine sand, and the mud content of sand is less than 1%, and fineness modulus is 1.6, and dries water content and be not more than 1%.After fine sand is put into, after rapping sidewall to sand no longer sedimentation, strike off sand upper surface, then concrete block is installed.
5) measure and determine the height of each sand cylinder
Height measurement is accurately carried out in scene, determines the actual overall height of each bridge temporary support, determines the settlement parameter under sand status under loading, require that combined type bridge temporary support concrete block top surface is higher than permanent bearing end face 25 ~ 30mm according to test.In order to the installed height mark controlling beam is consistent with design elevation, after combined type bridge temporary support is subject to the weight of beam, carry out settling amount observation, after requiring to place crossbeam, the posterior settlement amount of fine sand controls between 6 ~ 8mm.
6) the default sand compressed value side etc. of the height of bridge temporary support and bearing capacity, sand load-bearing subsidence curve, the relation curve of unit pressure and distortion, regression equation, derivation is determined in test.
First will carry out the Design of Bearing Capacity of bridge temporary support, bridge temporary support carries out pressure testing on forcing press, ensure that the height of bridge temporary support and design bearing capacity two aspects meet the requirements.
7) test room's pressure testing and sedimentation value are determined
Random selecting 3 from the bridge temporary support finished product completed, carry out compressive property test, carry out multistage loadings, on forcing press, pressure testing maximum load is 706KN, all there is not obvious slight crack in concrete block, wooden sandbox 1 is without apparent damage, and loading dry sand 7 is highly 130mm, decrement is 37-38mm, obtains data as shown in the table according to test room:
When load is 500KN, compression factor is about 29.8%, according to result of the test, by maximum load be 500KN calculate, choose load sand be 13cm, load after compression after sand thickness be 91mm, steel pipe 3 is highly 7cm, and concrete block distance steel pipe 3 pushes up about 20mm, meets off-load and tears open and move requirement.
After combined bridge temporary support pressurized, actual height is 247mm, consider bent cap out-of-flatness and horizontal wall inscription problem, 5-15mm high grade mortar is adopted to carry out levelling when bearing is installed, after accurately measuring actual elevation, determine the actual overall height after the installation of each combined type bridge temporary support, consider the settling amount of sand simultaneously, require that combined type bridge temporary support concrete block top is higher than permanent bearing end face 5 ~ 8mm.In order to the installed height mark controlling beam is consistent with design elevation, after the beam that temporarily falls, carry out settling amount observation, after requiring to place crossbeam, the settling amount of fine sand controls between 6 ~ 8mm.
4, bridge temporary support is installed
1) pier top is cleaned out.Draw " T " font axis in length and breadth respectively at bearing and pier top, pier is released bearing elevation control.
2) before each bridge temporary support is installed, advanced row-coordinate location, then high according to designing requirement determination bridge temporary support top mark, absolute altitude deviation meets code requirement.Concrete steps are as follows:
A, first to the 0.5-2cm cement mortar screeding of concrete surface on bent cap, more than grade of mortar M20, the effect of mortar has two, and first is levelling, guarantees bridge temporary support level; Second is temporary fixed wooden sandbox 1; Mortar only need by levelling, and thickness is generally not more than 20mm.
B, for bridge temporary support placing position, during bent cap actual elevation 3cm more than lower than design load, adopt high grade pea gravel concrete levelling, generally do not adopt mortar, also can adopt the way suitably increasing the sand amount of putting into simultaneously, and bent cap actual elevation than design load more than height 3cm time, suitably steel pipe 3 is shortened 15-20mm.
After C, steel pipe 3 are placed on wooden sandbox 1; pour the fine sand of dried and clean into, touch straight wall to sand no longer sedimentation packed uniform, then with scraper, sand is struck off; after bridge temporary support presses coordinate installation; concrete block loaded and lays steadily, touching top with rubber hammer, accurately levelling with spirit level; guarantee concrete block upper surface level; and according to the ratio of pressurized compression, adopt and increase, subtract the sand amount of putting into and suitably adjusts, guarantee that preset absolute altitude meets technical requirements.
D, as shown in Figure 3, to carry out after bridge temporary support installs elevation check measurement and coordinate check, confirm errorless after, by between concrete block 2 and wooden sandbox 1 sidewall with the top of filling dry sand 10 and be filled to wooden sandbox 1, front cover and edge sealing process is carried out with mortar 9 between the filling sand face, top of dry sand 10 and the edge of concrete block 2 and wooden sandbox 1, prevent rainwater from entering wooden sandbox 1, thus change is damp, inefficacy of hardening to prevent dry sand from absorbing water, causes decrement occur deviation or remove inconvenience.
5, beam slab lifting construction
Full-bridge erection adopts double-machine lifting crane, and Beam transportation vehicle, on pioneer road, carries out piecewise according to lifting sequence.Adopt " T " font quick astrofix, quick position can be guaranteed during Installation of beam slab and lay, after the erection of first side bar, temporary support reinforcing is carried out with flitch, then the lifting of lower a slice beam is carried out, by above-mentioned hanging method, lift second beam, firm with first side bar welding after second beam is in place.Meanwhile, in order to ensure concrete support post 2 end face uniform stressed, concrete block end face should place the thick rubber pad of 2mm 8, and guaranteeing can be closely evenly closely connected with concrete block bottom case beam, and part eliminates impact load to the infringement of combined type bridge temporary support simultaneously.
6, bridge temporary support is removed
After bridge floor hogging moment prestressed stretch-draw completes, treat that mud jacking intensity is greater than the dismountable bridge temporary support in design strength rear.The installment and debugging of permanent bearing should be completed before removing combined type bridge temporary support.Removing combined type bridge temporary support should accomplish hole-specifically symmetrical, even, synchronous, steady.Operative will have operating platform, generally arranges a movable Hanging Basket, carries out the platform of bridge temporary support releasing as personnel, and adopt electric drill at the preformed hole of wooden sandbox 1 side wall markings, namely perforate marks 6 place's jewel holes, and sand is flowed out automatically.Along with the sand of 1 li, wooden sandbox reduces gradually, concrete support post 2 slowly declines, until depart from the bottom of combined type bridge temporary support and beam.After combined type bridge temporary support removes unloading, tightly fit at the bottom of permanent bearing and Dun Ding, beam, finally realize Simply supported non-uniform system transform.
Of the present utility modelly be not limited to above-described embodiment; the technical scheme of each embodiment above-mentioned of the present utility model combined crosswise can form new technical scheme each other; all employings are equal to the technical scheme of replacing and being formed in addition, all drop in the protection domain of the utility model requirement.
Claims (3)
1. combined type bridge temporary support, it is characterized in that: comprise the wooden sandbox of open top, be filled in described wooden sandbox and have mobility dry sand, be vertically embedded in steel pipe in described dry sand, to be placed on above described steel pipe and higher than the concrete support post of described wood sand box top, the bottom of wherein said steel pipe is reserved with clearance hole, and the top of described concrete support post is placed with rubber pad.
2. combined type bridge temporary support according to claim 1, is characterized in that: arranged outside eight stiffeners of described wooden sandbox are strengthened.
3. combined type bridge temporary support according to claim 2, is characterized in that: described wooden sandbox outside indicates the perforate corresponding with described clearance hole position and marks, and support column is concrete block.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105133487A (en) * | 2015-10-08 | 2015-12-09 | 北京城建道桥建设集团有限公司 | Combined type bridge temporary support and construction method for rapidly building continuous beams by virtue of same |
| CN105603883A (en) * | 2016-03-04 | 2016-05-25 | 中国水利水电第十四工程局有限公司 | Bridge capping beam or tie beam formwork support adjusting device and application |
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2015
- 2015-10-08 CN CN201520773855.8U patent/CN205035732U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105133487A (en) * | 2015-10-08 | 2015-12-09 | 北京城建道桥建设集团有限公司 | Combined type bridge temporary support and construction method for rapidly building continuous beams by virtue of same |
| CN105603883A (en) * | 2016-03-04 | 2016-05-25 | 中国水利水电第十四工程局有限公司 | Bridge capping beam or tie beam formwork support adjusting device and application |
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