CN103485360B - A kind of steel platform tower crane foundation and construction method thereof - Google Patents
A kind of steel platform tower crane foundation and construction method thereof Download PDFInfo
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Abstract
The present invention discloses a kind of steel platform tower crane foundation and construction method thereof, comprise bored pile, steel lattice column and steel cushion cap, described steel lattice column is fixed on bored pile, described steel cushion cap comprises four girder steels, wherein: two is lower floor's girder steel, another two is upper strata girder steel, and upper strata girder steel is fixed on lower floor's girder steel and forms groined type structure, lower floor's girder steel is fixed on steel lattice column, and tower crane is fixed on the girder steel of upper strata; The present invention (1) tower crane girder steel adopts factory process, and bolt box carries out setting-out perforate according to standard section of tower crane Bolt sizes, and bolt hole precision is higher; (2) in-site installation, remove more convenient, namely tower crane is installed after basic installation, eliminates concrete curing time; (3) as long as demounting bolt is removed on basis carry out handling, do not need breaking concrete, remove more convenient; (4) girder steel removed can repeatedly reuse, and saves construction cost.
Description
Technical field
The present invention relates to a kind of tower crane, particularly relate to a kind of steel platform tower crane foundation and construction method thereof, belong to technical field of building construction.
Background technology
For Large Foundation Pit, tower crane need be placed in foundation ditch to meet the needs of vertical transport, and foundation ditch area is larger, bracing of foundation pit is designed with reinforced concrete inner support, tower crane needs to install before soil excavation, after soil excavation tower crane install, lifting more difficult, reinforced concrete support construction time also need use tower crane.
General tower crane adopts pile to carry lattice column concrete foundation.This foundation construction is more conventional reinforcing bar, template, concrete technology, constructs more convenient.But there is its corresponding shortcoming on this basis: 1. higher to bolt embedment required precision; 2., after concreting, the concrete curing time be experienced; 3., after tower crane is removed, effort is compared to abolishing of basis; 4. one-time investment, can not reuse.
Summary of the invention
Goal of the invention: the object of the invention is to for the deficiencies in the prior art, a kind of steel platform tower crane foundation and construction method thereof are provided, this pattern tower crane girder steel adopts factory process, and bolt box carries out setting-out perforate according to standard section of tower crane Bolt sizes, and bolt hole precision is higher; In-site installation, remove more convenient, namely tower crane is installed after basic installation, eliminates concrete curing time; As long as demounting bolt is removed on basis carry out handling, do not need breaking concrete, remove more convenient; The girder steel removed can repeatedly reuse, and saves construction cost.
Technical scheme: a kind of steel platform tower crane foundation of the present invention, comprise bored pile, steel lattice column and steel cushion cap, described steel lattice column is fixed on bored pile, described steel cushion cap comprises four girder steels, wherein: two is lower floor's girder steel, another two is upper strata girder steel, and upper strata girder steel is fixed on lower floor's girder steel and forms groined type structure, lower floor's girder steel is fixed on steel lattice column, and tower crane is fixed on the girder steel of upper strata.
Improve technique scheme further, between described steel lattice column, be connected with bracing or strutting arrangement.
The quantity of described bored pile is four, and the line of stake position is square.
Described steel lattice column adopts four angle steel and batten plate to be welded, and cross section is square.
The top of described steel lattice column is fixed with billet, described billet is square, and the length of side is greater than the steel lattice column cross section length of side, the axis of described billet is overlapping with the axis of steel lattice column, and its surrounding is protruded the part of steel lattice column and had screw for being connected with lower floor girder steel.
The side, top four of described steel lattice column is fixed with side steel plate, is provided with stiffener between described side steel plate and billet.
Described girder steel is made up of upper beam slab, lower beam slab and the gripper shoe be fixed between upper and lower beam slab, its cross section be I-shaped or
shape, described girder steel is evenly provided with some vertical stiffeners along its length, and described stiffener is connected with upper beam slab, lower beam slab and gripper shoe respectively.
The construction method of above-mentioned steel platform tower crane foundation, comprises the steps:
(1) bored pile construction: each tower crane foundation pile adopts four castinplace piles, and the line of stake position is square, comprises bored pile location, drilling and forming hole, for the first time clear hole, transfers reinforcing cage, downcomer, second time hole and concrete placed under water clearly;
(2) steel lattice column construction: steel lattice column makes in advance, at bored pile well head, temporary fastening device is installed, by temporary fixed to design elevation position for slow for steel lattice column vertical lifting, and couple together with vertical correction device, the vertical condition of lattice column is shown now by inclinometer pipe, adjust in time in the underwater concreting process of bored pile, until the complete perpendicularity of lattice column of concreting is fixed after meeting design requirement again;
(3) steel lattice column leveling: steel lattice column is dug out at scene, measures unified absolute altitude with level gauge, removes, polish steel lattice column suitable for reading after drawing same elevation line with gas welding;
(4) each steel lattice column top billet and side steel plate is welded: weld one piece of billet on each steel lattice column top, side welding side, lattice column four sides steel plate;
(5) lower floor's girder steel connects: lower floor's girder steel is fixed on the billet on lattice column top by bolt and screw, and two girder steels are parallel to each other, and every root girder steel is corresponding to be supported by two steel lattice columns;
(6) upper strata girder steel connects: winched on lower floor's girder steel by upper strata girder steel, be joined with bolts, levels girder steel is groined type structure;
(7) stiffener and bracing or strutting arrangement welding, the billet on steel lattice column top welds stiffener with between the steel plate of side, and stiffener utilizes steel plate to carry out on-site cutting according to design and on-site actual situations, and piecemeal welds with billet; After stiffener has welded, be welded with bracing or strutting arrangement between adjacent steel lattice column, described horizontal support device comprises horizontal lattice column, and pad is positioned on the upper end sidewall of steel lattice column.
Further, in described step (seven) along with being welded with bridging and planche cross support welding between the adjacent or relative steel lattice column of the excavation of the earthwork.
The tie point of girder steel and lower floor's girder steel and steel lattice column be point-blank at the middle and upper levels for described step (six).
Compared with prior art, its beneficial effect is in the present invention: (1) tower crane girder steel adopts factory process, and bolt box carries out setting-out perforate according to standard section of tower crane Bolt sizes, and bolt hole precision is higher; (2) in-site installation, remove more convenient, namely tower crane is installed after basic installation, eliminates concrete curing time; (3) as long as demounting bolt is removed on basis carry out handling, do not need breaking concrete, remove more convenient; (4) girder steel removed can repeatedly reuse, and saves construction cost.
Accompanying drawing explanation
Fig. 1 is the organigram on steel lattice column top.
Fig. 2 is lower floor's girder steel and the superimposed schematic diagram of steel lattice column.
Fig. 3 is upper strata girder steel and the superimposed schematic diagram of lower floor's girder steel.
Fig. 4 is that standard section of tower crane bolt hole schematic diagram reserved by upper strata girder steel.
In figure: 1, billet; 2, stiffener; 3, upper beam slab; 4, gripper shoe; 5, stiffener; 6, lower floor's girder steel; 7, upper strata girder steel; 8, standard section of tower crane bolt hole.
Detailed description of the invention
Below technical solution of the present invention is described in detail, but protection scope of the present invention is not limited to described embodiment.
embodiment 1:as shown in Figures 1 to 4, a kind of steel platform tower crane foundation, comprises bored pile, steel lattice column and steel cushion cap;
The quantity of described bored pile is four, and the line of stake position is square, stake footpath 0.8m, adjacent studs spacing 2.4m, effective length 26m.
Described steel lattice column adopts 4 L140 × 140 × 14mm angle steel and 440 × 200 × 12mm batten plate to be welded, and form of fracture is that 480mm × 480mm is square, long 11.9m, batten plate center to center distance 500mm.
The top of described steel lattice column is fixed with billet, described billet is Q235 level steel, specifically be of a size of 760mm × 760mm × 20mm, the axis of described billet is overlapping with the axis of steel lattice column, and its surrounding is protruded the part of steel lattice column and had screw for being connected with lower floor girder steel; The side, top four of described steel lattice column is fixed with side steel plate, is provided with stiffener between described side steel plate and billet; Be welded with bracing or strutting arrangement between adjacent steel lattice column, described horizontal support device comprises horizontal lattice column, and pad is positioned on the upper end sidewall of steel lattice column.
Described steel dimension of platform is 3560mm × 3560mm × 800mm, comprise four girder steels, two is lower floor's girder steel, another two is upper strata girder steel, every bar girder steel is of a size of 3560mm × 700mm × 400mm, described girder steel is by upper beam slab, lower beam slab and the gripper shoe be fixed between upper and lower beam slab are formed, its cross section is I-shaped, described girder steel both sides are evenly provided with eight pieces of vertical stiffeners along its length respectively, described stiffener respectively with upper beam slab, lower beam slab and gripper shoe connect, on, the Q235 steel that lower beam slab all adopts 20mm thick, the Q235 steel that gripper shoe and stiffener adopt 16mm thick, upper strata girder steel is fixed on lower floor's girder steel by bolt and screw and forms groined type structure, and reserved standard section of tower crane bolt hole on the girder steel of upper strata.
Described steel lattice column is fixed on bored pile, lower floor's girder steel is fixed on the billet on steel lattice column top by bolt and screw, two girder steels are parallel to each other, and every root girder steel is corresponding to be supported by two steel lattice columns, and tower crane is fixed on the girder steel of upper strata by standard section of tower crane bolt hole.
The construction method of above-mentioned steel platform tower crane foundation, comprises the steps:
(1) bored pile construction: comprise bored pile location, drilling and forming hole (mud off), for the first time clear hole, transfer reinforcing cage, downcomer, second time hole and concrete placed under water clearly;
The item should noted in work progress is:
Mud: in hole, mud liquid level should be kept above more than groundwater table 0.5m, mud balance configuration should keep hole wall to stablize.
Clear hole: clear hole should be carried out at twice, and first time carries out immediately after pore-forming completes; Second time is carried out transferring after reinforcing cage and concrete perfusion conduit install.
Fabrication of reinforcing cage: reinforcing cage sectional making, section length should depending on becoming the integral rigidity of cage, and the length of supplied materials reinforcing bar and the effective height factor of crane gear are rationally determined; For ensureing protection of steel bar gabion layer thickness, should weld spacer pad in the both sides of reinforcing cage, two row are established in the every side of reinforcing cage horizontal direction, and often row cushion block longitudinal pitch is 4m; Reinforcing cage is in lifting, transport and should take measures in installing to prevent distortion; Heave Here should be located at reinforcing rib position, and reinforcing cage fitting depth should meet designing requirement, and its allowable variation is ± 100mm.
(2) steel lattice column construction: in stake, four steel lattice columns should make in advance, a 50t crawler crane is adopted to lift installation lattice column, at bored pile well head, temporary fastening device is installed, by temporary fixed to design elevation position for the slow vertical lifting of steel lattice column made, and couple together with vertical correction device, the vertical condition of lattice column is shown now by inclinometer pipe, adjust in time in concreting process under water, until the complete perpendicularity of lattice column of concreting is fixed after meeting design requirement again; The verticality of every root steel pile is must be noted that, the center distance of four lattice columns after requiring stake to complete: the length of side and diagonal error are no more than 50mm in construction.
(3) steel lattice column leveling: steel lattice column is dug out at scene, four basic steel lattice column tops must level, guarantee steel cushion cap install after planeness control within 2mm, measure unified absolute altitude with level gauge, remove with gas welding after drawing same elevation line, polish steel lattice column suitable for reading.
(4) each steel lattice column top billet and side steel plate is welded: weld one piece of billet on each steel lattice column top, side welding side, lattice column four sides steel plate.
(5) lower floor's girder steel connects: lower floor's girder steel is fixed on the billet on lattice column top by bolt and screw, and two girder steels are parallel to each other, and every root girder steel is corresponding to be supported by two steel lattice columns.
(6) upper strata girder steel connects: winched on lower floor's girder steel by upper strata girder steel, be joined with bolts, upper and lower layer girder steel is groined type structure; And the tie point of upper strata girder steel and lower floor's girder steel and steel lattice column are point-blank.
(7) stiffener and bracing or strutting arrangement welding, the billet on steel lattice column top welds two pieces of stiffeners with between the steel plate of each side, and stiffener utilizes steel plate to carry out on-site cutting according to design and on-site actual situations, and piecemeal welds with billet; After stiffener has welded, bracing or strutting arrangement is welded with between adjacent steel lattice column, described horizontal support device comprises horizontal lattice column, pad is positioned on the upper end sidewall of steel lattice column, and along with being welded with bridging and planche cross support welding between the adjacent or relative steel lattice column of the excavation of the earthwork.
Because this tower crane adopts four girder steel compositions, the dismounting on basis is without the need to abolishing.After tower crane is removed, removal girder steel and girder steel and the bolt between girder steel and lattice capital backing plate, adopt mobile crane to allocate and transport out place, technics comparing is simple.Base support lattice column adopts piecemeal cutting to clear out place.Tower crane fills up the floor box out of tower crane position after removing from bottom to up.
As mentioned above, although represented with reference to specific preferred embodiment and described the present invention, it shall not be construed as the restriction to the present invention self.Under the spirit and scope of the present invention prerequisite not departing from claims definition, various change can be made in the form and details to it.
Claims (10)
1. a steel platform tower crane foundation, it is characterized in that: comprise bored pile, steel lattice column and steel cushion cap, described steel lattice column is fixed on bored pile, described steel cushion cap comprises four girder steels, wherein: two is lower floor's girder steel, another two is upper strata girder steel, and upper strata girder steel is fixed on lower floor's girder steel and forms groined type structure, lower floor's girder steel is fixed on steel lattice column, and tower crane is fixed on the girder steel of upper strata.
2. a kind of steel platform tower crane foundation according to claim 1, is characterized in that: be connected with bracing or strutting arrangement between described steel lattice column.
3. a kind of steel platform tower crane foundation according to claim 1, is characterized in that: the quantity of described bored pile is four, and the line of stake position is square.
4. a kind of steel platform tower crane foundation according to claim 3, is characterized in that: described steel lattice column adopts four angle steel and batten plate to be welded, and cross section is square.
5. a kind of steel platform tower crane foundation according to claim 4, it is characterized in that: the top of described steel lattice column is fixed with billet, described billet is square, and the length of side is greater than the cross section length of side of steel lattice column, the axis of described billet is overlapping with the axis of steel lattice column, and its surrounding is protruded the part of steel lattice column and had screw for being connected with lower floor girder steel.
6. a kind of steel platform tower crane foundation according to claim 5, is characterized in that: the side, top four of described steel lattice column is fixed with side steel plate, is provided with stiffener between described side steel plate and billet.
7. a kind of steel platform tower crane foundation according to claim 6, is characterized in that: described girder steel is made up of upper beam slab, lower beam slab and the gripper shoe be fixed between upper and lower beam slab, its cross section be I-shaped or
shape, described girder steel is evenly provided with some vertical stiffeners along its length, and described stiffener is connected with upper beam slab, lower beam slab and gripper shoe respectively.
8. a construction method for steel platform tower crane foundation described in claim 1, is characterized in that, comprise the steps:
(1) bored pile construction: each tower crane foundation pile adopts four castinplace piles, and the line of stake position is square, comprises bored pile location, drilling and forming hole, for the first time clear hole, transfers reinforcing cage, downcomer, second time hole and concrete placed under water clearly;
(2) steel lattice column construction: steel lattice column makes in advance, at bored pile well head, temporary fastening device is installed, by temporary fixed to design elevation position for slow for steel lattice column vertical lifting, and couple together with vertical correction device, the vertical condition of lattice column is shown now by inclinometer pipe, adjust in time in the underwater concreting process of bored pile, until the complete perpendicularity of lattice column of concreting is fixed after meeting design requirement again;
(3) steel lattice column leveling: steel lattice column is dug out at scene, measures unified absolute altitude with level gauge, removes, polish steel lattice column suitable for reading after drawing same elevation line with gas welding;
(4) each steel lattice column top billet and side steel plate is welded: weld one piece of billet on each steel lattice column top, side welding side, lattice column four sides steel plate;
(5) lower floor's girder steel connects: lower floor's girder steel is fixed on the billet on lattice column top by bolt and screw, and two girder steels are parallel to each other, and every root girder steel is corresponding to be supported by two steel lattice columns;
(6) upper strata girder steel connects: winched on lower floor's girder steel by upper strata girder steel, be joined with bolts, levels girder steel is groined type structure;
(7) stiffener and bracing or strutting arrangement welding, the billet on steel lattice column top welds stiffener with between the steel plate of side, and stiffener utilizes steel plate to carry out on-site cutting according to design and on-site actual situations, and piecemeal welds with billet; After stiffener has welded, be welded with bracing or strutting arrangement between adjacent steel lattice column, described horizontal support device comprises horizontal lattice column, and pad is positioned on the upper end sidewall of steel lattice column.
9. the construction method of steel platform tower crane foundation according to claim 8, is characterized in that, along with being welded with bridging and planche cross support welding between the adjacent or relative steel lattice column of the excavation of the earthwork in described step (seven).
10. the construction method of steel platform tower crane foundation according to claim 8, is characterized in that, the tie point of girder steel and lower floor's girder steel and steel lattice column be point-blank at the middle and upper levels for described step (six).
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