Utility model content
The purpose of this utility model is the Bridge High-pier construction of cast-in-situ box-beam support system providing a kind of improvement, to simplify existing working procedure, to reduce construction cost and work high above the ground risk.
To achieve these goals, the utility model have employed following technical scheme: Bridge High-pier construction of cast-in-situ box-beam support system, the strip foundation comprising bridge pier and be arranged at evenly and at intervals between bridge pier, it is characterized in that, some steel pipe piles are side by side provided with on bridge pier or strip foundation, diagonal brace is provided with between adjacent steel pipe pile, the top of steel pipe pile is provided with beam sandbox, the i iron of direction across bridge is provided with at the beam sandbox top that falls, the i iron top of direction across bridge is provided with the Bailey beam that beret truss builds, Bailey beam top is provided with horizontal i iron, i iron top is equipped with box girder template, box girder template has built concrete box girder.
Particularly, sandbox top is provided with two i iron side by side.
Preferably, described sandbox comprises inner core and urceolus, inner core top is provided with carrying upper end cover, carrying lower shoe is provided with bottom urceolus, gap between inner core and urceolus is 1 ~ 2mm, the bottom of urceolus is respectively provided with a sand removing hole on relative two side, and be socketed with inner core after urceolus filling sand grains, inner core has concrete perfusion.
The width of described carrying upper end cover is greater than the projection width of two i iron at sandbox top.
Preferably, be 4cm bottom described sand removing hole distance urceolus.
The support of the utility model cast-in-situ box girder adopts steel pipe pile in conjunction with Bailey beam technique, by sandbox as the control of bottom die of box-beam absolute altitude and unloading, achieves the target simplifying working procedure, reduce construction cost, reduces work high above the ground risk.Sandbox makes simple and easy, easy to use, safe and reliable, and bearing capacity is large, and have the many merits such as higher operability, economic results in society are obvious.
Accompanying drawing explanation
Fig. 1 is that steel pipe support cast-in-situ box girder is longitudinally to sectional drawing.
Fig. 2 is the direction across bridge sectional drawing of construction of cast-in-situ box-beam system.
Fig. 3 is sandbox structural representation, is loaded state shown in figure.
Fig. 4 is sandbox structural representation, is state after unloading shown in figure.
In figure, 0# abutment 100,1# bridge pier 101,2# bridge pier 102,3# bridge pier 103,1# abutment 104, strip foundation 105, steel pipe pile 106, diagonal brace 107, lateral ties bar 108, junction steel plate 109, sandbox 110, i iron 111, Bailey beam 112, box girder template 113, case beam 114, inner core 1101, urceolus 1102, carrying upper end cover 1103, carrying lower shoe 1104, stiffened steel plates 1105, suspension ring 1106, gag lever post 1107, unloads sand valve 1108, sand removing hole 1109
Detailed description of the invention
As shown in Figure 1, for the utility model faced by the longitudinal profile situation of construction bridges.This bridge be 4 across, adopt post stressed concrete two-wire simple supported box beam.Simple supported box beam cross-sectional shape adopts contour single box single chamber form.
As shown in Figure 2, be the Construction Supporting System of this bridge box and beam, it comprises the 1# bridge pier 101,2# bridge pier 102, the 3# bridge pier 103 that are arranged between 0# abutment 100 and 1# abutment 104, and is arranged at the strip foundation 105 between bridge pier evenly and at intervals.The steel pipe pile of row's direction across bridge is provided with on bridge pier or strip foundation.As shown in Figure 2, for strip foundation, each row's steel pipe pile is made up of 5 steel pipe piles 106, is provided with diagonal brace 107 and lateral ties bar 108 between adjacent steel pipe pile 106.The top of steel pipe pile 106 is provided with beam sandbox 110, the Two bors d's oeuveres i iron 111 of direction across bridge is provided with at beam sandbox 110 top that falls, i iron top is provided with the Bailey beam 112 that beret truss builds, Bailey beam top is provided with horizontal i iron, i iron top is provided with box girder template 113, box girder template 113 has been built concrete box girder 114.
Sandbox use principle is similar to jack.As shown in Figure 3, Figure 4, sandbox 110 comprises inner core 1101 and urceolus 1102, and inner core 1101 top is provided with carrying upper end cover 1103, and be provided with carrying lower shoe 1104 bottom urceolus, the bottom of urceolus is respectively provided with a sand removing hole 1109 on relative two side.Utilize sand to have less compressibilty and the feature compared with large fluidity, in the bearing load stage, by urceolus install close, then urceolus in-built enter sand grains, reinstall inner core, inner core concrete perfusion.When inside is full of sand grains, the supporting role of similar jack can be played, as one of temporary supporting system.When uninstall process, by the release of sand grains, inner core glides under deadweight and vertical External Force Acting, makes temporary supporting system template and beam body realize being separated.
According to this engineering temporary supporting system force analysis, the maximum vertical load F that steel pipe bears is 1680KN.
Sandbox is effectively separated with beam body for realizing temporary supporting system template in uninstall process, and falling head controls at about 5 ~ 8cm; Consider that sand grains certainly exists certain residual in unloading, in conjunction with the altitudes of sand removing hole, therefore pre-height stays 4cm sediment outflow surplus, and therefore designing bottom sand removing hole distance urceolus is 4 centimetres.Consider vertically to adopt triangle stiffened steel plates 1105 to reinforce outside inner core upper support steel plate and inner core simultaneously.Finally determine that sandbox inner core, urceolus make and be highly respectively 26cm, 24cm.
Because adopted Two bors d's oeuveres I56b i iron plane projection width is 33.2cm, consider that circular section is easy to process, and mechanical characteristic is along the circumferential direction consistent, therefore primary election specification is that Φ 32.5cm steel pipe is as sandbox urceolus processing raw material simultaneously.Consider that on-the-spot fine sand size grading span is large, cannot meet sandbox instructions for use, this engineering outsourcing density is that the fine sand of 1.4t/m3 uses particle as sandbox; By consulting related data, the natural packing angle Q of this sand grains is 30 °.Inner core should carry out strict size with the caliber of urceolus and mate, and the too small inner core in gap easily causes machinery " stuck " phenomenon, and excesssive gap can cause " overflow sand " phenomenon because sand floats, when should guarantee that piston is placed in the middle, one-sided gap size controls to be advisable at 1 ~ 2mm for this reason.
Finally select, Φ 32.5 × 2.4cm selected by this engineering urceolus; Inner core adopts the steel pipe of Φ 27.3 × 0.8cm.
On sandbox inner core, bearing end plate size requires to comprise Two bors d's oeuveres i iron projection width, and need reserve certain plane space i iron and sandbox are formed effective consolidation; Under sandbox urceolus, bearing end plate size requires to increase with the contact area of steel pipe top steel deck-plate and reserves enough plane spaces and vertical triangle stiffened steel plates outside steel plate and urceolus is reinforced.
On this engineering sandbox inner core, bearing end employing planar dimension is the steel plate of 50 × 40cm, thickness 1.6cm, the welding space that after guaranteeing to install Two bors d's oeuveres i iron, both sides have 8.4cm wide; Under urceolus, bearing end employing planar dimension is the steel plate of 42.5 × 42.5cm, thickness 2.0cm.
Sandbox installation process, as lifted by plant equipment, vertically arranges 2 place's suspension ring 1106 in the outer drum outer wall port of sandbox; Semicircle is arranged to by suspension ring, and centre punches.
For ensureing the sediment outflow effect of sand, consider in sediment outflow process because other sandbox sediment outflow can be stopped rapidly when indivedual sediment outflow goes wrong.This sandbox unloads sand valve realize sediment outflow by beaing lifting, beats decline and unloads sand valve and realize stopping sediment outflow.Unload symmetrical two of sand mouth, unloading sand valve is the arc being closely covered in urceolus lateral surface, unloads the gag lever post that sand valve upper end has radial projection.Described limit valve plate is annular, and inner ring correspondence limit valve plate place offers groove.Gag lever post is positioned at above limit valve plate.
The utility model is implemented in accordance with the following methods:
Grade beam of first constructing is basic, and surveying and locating positioning steel tube pile center adds a cover steel plate and welds along steel pipe periphery, with [16 channel-section steels carry out cross reinforcing between steel pipe pile after steel pipe setting to predetermined absolute altitude; Secondly, steel pipe cover plate carries out center setting-out and absolute altitude repetition measurement after reinforcing, and carries out sandbox installation after repetition measurement is errorless, sandbox arranges that Shi Qi center should be corresponding with steel pipe pile center, avoid producing eccentric load to steel pipe pile, arrange that laggard rower is high to be checked, check errorless after be welded and fixed; Two bors d's oeuveres I56b i iron is installed again, and with stiffened steel plates, socket end Plate Welding on i iron and sandbox is fixed; Finally, beret truss and with upper part is installed.
Sandbox, after installing, seals sandbox at once, avoids rainwater to be infiltrated in sandbox by gap between sand removing hole, inner/outer tube and carries out rust corrosion caking to inside sandbox, cause sediment outflow difficulty.This engineering adopts paraffin to carry out encapsulation process to sandbox, and be in liquid state after heating paraffin, formed solid-state under being cooled to normal temperature, sealing effectiveness is good.
Sandbox unloading is carried out after construction of cast-in-situ box-beam is complete.According to constructure scheme, sandbox is arranged along steel pipe, often arranges 5, divides and unload for 2 times in uninstall process; First remove and often arrange the 2nd and the 4th sandbox, more synchronous dismounting is often across residue sandbox.
In this engineering height pier construction of cast-in-situ box-beam, sandbox successful Application is implemented.Temporary support achieves absolute altitude and accurately controls in installation process; The absolute altitude monitor data of sandbox in bearing load process shows, the settlement Control error of sandbox is within the scope of 2mm ~ 3mm.In temporary support uninstall process, successfully realize template by sandbox and be separated with beam body; Because the above temporary support of beret truss is the steel beam column that rigidity is large, planeness is good, in conjunction with hoist engine application technology, greatly improve dismounting effect of temporary support.