CN105220808A - Large-span prestressed arch bar site prefabrication construction method of installation - Google Patents

Large-span prestressed arch bar site prefabrication construction method of installation Download PDF

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Publication number
CN105220808A
CN105220808A CN201510578558.2A CN201510578558A CN105220808A CN 105220808 A CN105220808 A CN 105220808A CN 201510578558 A CN201510578558 A CN 201510578558A CN 105220808 A CN105220808 A CN 105220808A
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plate
median septum
prestressing force
bar
edge
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CN201510578558.2A
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Chinese (zh)
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CN105220808B (en
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王新泉
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杭州江润科技有限公司
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Abstract

The present invention relates to a kind of large-span prestressed arch bar site prefabrication construction method of installation, mainly comprise that presstressed reinforcing steel is arranged, step that prefabricated, shuttering supporting installations of median septum, the curved slab that winds up making, median septum installation, the making of lower edge prestressing force surface plate prestressed slab, tension of prestressed tendon, arch roof truss lift.The inventive method have safe and reliable, stability is strong, efficiency of construction is high, the features such as the site prefabrication requirement of arch roof truss in enormous quantities can be adapted to, there is good economic technology benefit.

Description

Large-span prestressed arch bar site prefabrication construction method of installation
Technical field
The present invention relates to large-span prestressed arch bar site prefabrication construction method of installation.
Technical background
Large-span prestressed arch roof truss by winding up, lower edge and the large component of vertical web three form.Upper and lower chord member is grooved tabular, and the median septum that upper and lower string links is the concrete hollow precast plate of a rectangle mount structure.This form of structure roof panel and roof truss are combined as a whole, makes this roof system have overall performance good, lightweight, and anti-seismic performance is good, can load-bearing, again can thermal insulation, has now been widely used in the construction of large granary.Because large-span prestressed arch bar span is comparatively large, transport inconvenience, therefore the general mode adopting site prefabrication.
Large-span prestressed arch bar is a kind of thin-walled plate profile structure, and require that arch bar winds up arch face radian unanimously, formwork erection difficulty is larger.The scaffold support system that traditional form work engineering adopts is for arrange three standpipes every 2m, core lumps of wood skeleton top edge does camber by full size full-page proof, base is in line, each block all will finish number, this technique uses steel pipe quantity large, template mounting or dismounting are more difficult, and lumps of wood skeleton easily misplaces.In the installation process of median septum, after median septum is made, directly anchored into by reserved anchor bar and wind up in curved slab and lower edge prestressed slab, Nodes does not do strengthens process, easily has an impact to the globality of structure.
Given this, need a kind of speed of application of invention at present badly fast, realize the construction method of the grain depot large-span prestressed arch bar site prefabrication structure that large-span prestressed arch roof truss fast, is accurately constructed.
Summary of the invention
The object of the present invention is to provide a kind of easy construction, meet the formwork needs of curved slab arc requirement of winding up, median septum node can be strengthened, realize the construction method of large-span prestressed arch bar on-the-spot batch precast construction.
For achieving the above object, present invention employs following technical scheme:
Large-span prestressed arch bar site prefabrication construction method of installation, is characterized in that, described structure is primarily of the curved slab that winds up, lower edge prestressing force surface plate, median septum and brace composition; The curved slab that winds up is parabolic trough plate; Lower edge prestressing force surface plate is prestressing force groove type plate, and presstressed reinforcing steel is fixed by the anchor slab on pedestal; The connecting elements of curved slab and lower edge prestressing force surface plate of winding up is median septum, median septum is the concrete hollow precast plate of a rectangle mount structure, median septum upper and lower end arranges reserved anchor bar and anchors into and wind up in curved slab and lower edge prestressing force surface plate, median septum left and right side is embedded with sleeve pipe, insert connecting reinforcement in the middle of sleeve pipe, connecting reinforcement through wind up curved slab and lower edge prestressing force surface plate by steel plate bolt anchoring; The curved slab that winds up is provided with built-in fitting with the junction of lower edge prestressing force surface plate and is connected with collar tie beam;
Described construction method comprises the following steps:
1) presstressed reinforcing steel is arranged: at prefabricated place setting table seat, determining table pier, table top and location-plate size; Table top builds 100 thick C30 concrete base layers, and concrete base layer lays plastic sheeting, and presstressed reinforcing steel is arranged by anchor slab;
2) median septum is prefabricated: median septum is the concrete hollow precast plate of a rectangle mount structure, and the on-the-spot lay-up method that adopts is prefabricated, and median septum upper and lower side reserves anchor bar, left and right sides service sleeve;
3) shuttering supporting is installed: the support of template adopts steel pipe framed bent combining form, and the vertical steel pipe spacing 2m of framed bent is arranged near median septum, and steel pipe top is bending and weld with each vertical steel pipe by the roof truss radian of curved plate that winds up; An arch cover adopts two welding framed bents, and centre steel tube fastener is taken tightly, and the distance between two welding framed bent steel pipes is the width of roof truss;
4) curved slab that winds up makes: the every block 2m of the curved slab side form that winds up, and beats diameter 6mm hole, wait until and be connected with beam bottom board along side form lower limb arc; Core panel nine plywood make, and core two ends nine plywood is beaten diameter 6mm hole, waits until and be connected with median septum template; Make beam bottom board with the wide wooden model of 100mm, the curved circular of bed die makes according to the curved line of beam side and core, finally binds reinforcing bar concreting;
5) median septum is installed: prefabricated median septum is pressed orientation axis and place, and the anchor bar that median septum two ends are reserved anchors in the plate of upper and lower string with in rib; Intert reinforcing bar in median septum service sleeve, reinforcing bar is through curved slab and the lower edge prestressing force surface plate of winding up, and after upper and lower string concreting, it is tight that the reinforcing bar bolt stretched out carries out anchor; Median septum constructs muscle with the curved slab that winds up, lower edge prestressing force surface plate junction by detailing requiments colligation, reserved brace; Before concreting, rush hair machine with high pressure dabbing process is carried out to median septum lower edges concrete surface;
6) lower edge prestressing force surface plate prestressed slab makes: scrape with concrete surface inside lower edge prestressed slab template, and the inboard mould of lower edge forms at median septum contact place by 2 pieces of templates respectively, with nine plywood of wide 100mm, is connected by two pieces of inboard moulds; Then colligation lower edge reinforcing bar, by tension of prestressed tendon after-pouring concrete, finally puts presstressed reinforcing steel, welding brace;
7) tension of prestressed tendon: the presstressed reinforcing steel of lower edge prestressing force surface plate adopts pre-tensioning system and post stretching combination, pre-tensioning system is adopted time prefabricated, then in service sleeve spaced apart, reinforcing bar is inserted, to the reinforced bar stretching in sleeve pipe after arch bar lifting, and be connected with the built-in fitting on collar tie beam;
8) arch roof truss lifting: clear up collar tie beam top and arch bar, after the arch bar demoulding, adopts 4 the suspension ring place liftings of double-machine lifting crane method; After arch bar correction is in place, welded by arch bar with the built-in fitting on collar tie beam, welding should in the welding simultaneously of arch bar diagonal.
Further, the plate end place of arch roof truss is embedded with steel plate and reserving hole, and make the built-in fitting on collar tie beam pass plate end, collar tie beam and plate end adopt bolt to weld and be connected.
Median septum is banded with structure muscle with the curved slab that winds up, lower edge prestressing force surface plate junction.
The upper end of steel pipe framed bent is form with the steel-pipe welding of curved slab with radian that wind up, and each pad is at a distance of 2m.
the present invention has following feature and beneficial effect:
(1) roof truss adopts the curved slab that winds up, and lower edge prestressed slab, the form of structure of intermediate arrangement median septum, reaches the effect alleviating deadweight, antidetonation, insulation.
(2) support of template adopts the combination of steel pipe framed bent, and framed bent top steel pipe bends and the mode of welding with each vertical steel pipe by the roof truss radian of curved plate that winds up, the effect achieving convenient disassembly, reduce steel pipe consumption, reduce operation.
(3) median septum is before arch roof truss construction, can producing by independent field lamination, without the need to building in work progress, not affecting the duration, improve efficiency of construction.
(4) median septum adopts service sleeve to intert reinforcing bar, last and upper and lower string prestressing force surface plate bolt carries out the tight mode of anchor, and the form that lower edge prestressing force surface plate presstressed reinforcing steel adopts pre-tensioning system and post stretching to combine, all serve and strengthen node connection, strengthen the object of structural integrity.
(5) lower edge prestressing force surface plate presstressed reinforcing steel adopts pre-tensioning system and post stretching combination, pre-tensioning system is adopted time prefabricated, then in service sleeve spaced apart, insert reinforcing bar, to the reinforced bar stretching in sleeve pipe after arch bar lifting, and be connected with the built-in fitting on collar tie beam.These joint structures strengthen stability and the anti-seismic performance of node strength and roof truss entirety greatly.
Accompanying drawing explanation
Fig. 1 is large-span prestressed arch bar plan view;
Fig. 2 is large-span prestressed arch bar site prefabrication elevation;
Fig. 3 is formwork and formwork supports figure;
Fig. 4 is median septum figure;
Fig. 5 is median septum connection detail;
Fig. 6 is construction flow chart of the present invention;
In figure: 1. vertical wall; 2. collar tie beam; 3. wind up curved slab; 4. lower edge prestressing force surface plate; 5. bolt; 6. steel plate; 7. service sleeve; 8. median septum; 9. brace; 10. suspension ring; 11. built-in fittings; 12. pedestals; 13. anchor slabs; 14. presstressed reinforcing steels; 15. concrete base layers; 16. lumps of wood; 17. steel pipe framed bents; 18. plastic sheetings; 19. reserved braces; 20. connecting reinforcements; 21. reserved anchor bars; 22. structure muscle.
Detailed description of the invention
Present embodiment emphasis sets forth the embodiment that the present invention relates to structure.
Fig. 1, Fig. 2 are large-span prestressed arch bar plan view and large-span prestressed arch bar site prefabrication elevation respectively.As shown in the figure, structure forms primarily of the curved slab 3 that winds up, lower edge prestressing force surface plate 4, median septum 8 and brace 9; Wind up curved slab 3 for parabolic trough plate; Lower edge prestressing force surface plate 4 is prestressing force groove type plate, and presstressed reinforcing steel 14 is fixed by the anchor slab 13 on pedestal 12; The connecting elements of curved slab 3 and lower edge prestressing force surface plate 4 of winding up is median septum 8, median septum 8 is the concrete hollow precast plate of a rectangle mount structure, median septum 8 upper and lower end arranges reserved anchor bar 21 and anchors into the curved slab 3 that winds up with lower edge prestressing force surface plate 4, median septum left and right side is embedded with sleeve pipe 7, insert connecting reinforcement 20 in the middle of sleeve pipe 7, connecting reinforcement 20 through the curved slab 3 that winds up with lower edge prestressing force surface plate 4 by the anchoring of steel plate 6 bolt 5; The curved slab 3 that winds up is provided with built-in fitting 11 with the junction of lower edge prestressing force surface plate 4 and is connected with collar tie beam 2.
Before large-span prestressed arch roof truss is prefabricated, with reference to shown in Fig. 2, first cast stretching bed seat 12, table top lays 100 thick C30 concrete base layers 15, and cement mortar screeding receives light.Paving plastic film 18 on concrete base layer 15.Anchor slab 13 on pedestal 12 positions presstressed reinforcing steel 14 according to the thickness of concrete cover of presstressed reinforcing steel and rebar spacing etc.
With reference to shown in Fig. 3, the support of template adopts steel pipe framed bent 17, and the vertical steel pipe spacing of framed bent is 2m, is arranged near median septum 8, and the highest dividing plate place, centre arranges two steel pipes, and steel pipe top is bending and weld with each vertical steel pipe by the roof truss radian of curved plate that winds up.An arch cover adopts two welding framed bents, and centre steel tube fastener is taken tightly, and the distance between two welding framed bent steel pipes is the width of roof truss.
With reference to shown in Fig. 4 and Fig. 5, the median septum 8 scene being shifted to an earlier date lamination production positions installation, and anchor bar 21 is reserved at median septum about 8 two ends, two ends, left and right service sleeve 7, and anchor bar 21 must spot welding.Median septum 8 constructs muscle 22 with the curved slab 3 that winds up, lower edge prestressing force surface plate 4 junction by detailing requiments colligation, reserved brace 19.Before concreting, rush hair machine with high pressure carry out dabbing process to median septum 8 lower edges concrete surface, last node is trapezoidal configuration.Intert connecting reinforcement 20 in median septum 8 service sleeve 7, when installing median septum 8, connecting reinforcement is through the curved slab that winds up, lower edge prestressing force surface plate, and after the curved slab that winds up, the concreting of lower edge prestressing force surface plate, to add upper steel plate 6 tight by bolt 5 anchor on both sides.
With reference to shown in Fig. 3, after placing the lumps of wood 16, install the side form of the curved slab 3 that winds up, horizontal range is 2m, and top edge makes arc according to roof truss full size full-page proof, and base is in line.Side form beats diameter 6mm hole along lower limb arc every 150mm, waits until and is connected with beam bottom board.Scrape with concrete surface inside lower edge prestressed slab 4 template, the inboard mould of lower edge is made up of two pieces of templates, at median septum 8 contact place, with nine plywood of wide 100mm, is connected by two pieces of inboard moulds.
With reference to shown in Fig. 1, collar tie beam 2 top and arch bar are cleared up, after the arch bar demoulding, adopt 4 the suspension ring 10 place liftings of double-machine lifting crane method.After arch bar correction is in place, the post-tensioning reinforced bar stretching spaced apart to lower edge prestressing force surface plate, finally welds arch bar with the built-in fitting 11 on collar tie beam, and welding should in the welding simultaneously of arch bar diagonal.
Fig. 6 is construction flow chart of the present invention; The construction method of grain depot large-span prestressed arch bar site prefabrication structure, comprises the following steps:
1) presstressed reinforcing steel is arranged: at prefabricated place setting table seat 12, determining table pier, table top and location-plate size; Table top builds 100 thick C30 concrete base layers 15, and concrete base layer 15 is laid plastic sheeting 18, presstressed reinforcing steel 14 is arranged by anchor slab 13;
2) median septum is prefabricated: median septum 8 is the concrete hollow precast plate of a rectangle mount structure, and the on-the-spot lay-up method that adopts is prefabricated, and median septum 8 upper and lower side reserves anchor bar 21, left and right sides service sleeve 7;
3) shuttering supporting is installed: the support of template adopts steel pipe framed bent 17 combining form, and the vertical steel pipe spacing 2m of framed bent is arranged near median septum, and steel pipe top is bending and weld with each vertical steel pipe by the roof truss radian of curved plate that winds up; An arch cover adopts two welding framed bents, and centre steel tube fastener is taken tightly, and the distance between two welding framed bent steel pipes is the width of roof truss;
4) curved slab that winds up makes: the every block 2m of the curved slab side form that winds up, and beats diameter 6mm hole, wait until and be connected with beam bottom board along side form lower limb arc; Core panel nine plywood make, and core two ends nine plywood is beaten diameter 6mm hole, waits until and be connected with median septum template; Make beam bottom board with the wide wooden model of 100mm, the curved circular of bed die makes according to the curved line of beam side and core, finally binds reinforcing bar concreting;
5) median septum is installed: prefabricated median septum 8 is pressed orientation axis and place, and the anchor bar 21 that median septum 8 two ends are reserved anchors in the plate of upper and lower string with in rib; Intert connecting reinforcement 20 in median septum service sleeve 7, connecting reinforcement is through curved slab 3 and the lower edge prestressing force surface plate 4 of winding up, and after upper and lower string concreting, it is tight that the reinforcing bar bolt stretched out carries out anchor; Median septum constructs muscle 22 with the curved slab that winds up, lower edge prestressing force surface plate junction by detailing requiments colligation, buries reserved brace 19 underground; Before concreting, rush hair machine with high pressure dabbing process is carried out to median septum lower edges concrete surface;
6) lower edge prestressing force surface plate prestressed slab makes: scrape with concrete surface inside lower edge prestressed slab template, and the inboard mould of lower edge forms at median septum contact place by 2 pieces of templates respectively, with nine plywood of wide 100mm, is connected by two pieces of inboard moulds; Then colligation lower edge reinforcing bar, by tension of prestressed tendon after-pouring concrete, finally puts presstressed reinforcing steel, welding brace 9;
7) tension of prestressed tendon: the presstressed reinforcing steel 14 of lower edge prestressing force surface plate 4 adopts pre-tensioning system and post stretching combination, pre-tensioning system is adopted time prefabricated, then in service sleeve spaced apart, reinforcing bar is inserted, to the reinforced bar stretching in sleeve pipe after arch bar lifting, and be connected with the built-in fitting on collar tie beam;
8) arch roof truss lifting: clear up collar tie beam 2 top and arch bar, after the arch bar demoulding, adopts 4 the suspension ring place liftings of double-machine lifting crane method; After arch bar correction is in place, welded by arch bar with the built-in fitting on collar tie beam, welding should in the welding simultaneously of arch bar diagonal.

Claims (4)

1. large-span prestressed arch bar site prefabrication construction method of installation, is characterized in that, described structure is primarily of the curved slab that winds up, lower edge prestressing force surface plate, median septum and brace composition; The curved slab that winds up is parabolic trough plate; Lower edge prestressing force surface plate is prestressing force groove type plate, and presstressed reinforcing steel is fixed by the anchor slab on pedestal; The connecting elements of curved slab and lower edge prestressing force surface plate of winding up is median septum, median septum is the concrete hollow precast plate of a rectangle mount structure, median septum upper and lower end arranges reserved anchor bar and anchors into and wind up in curved slab and lower edge prestressing force surface plate, median septum left and right side is embedded with sleeve pipe, insert connecting reinforcement in the middle of sleeve pipe, connecting reinforcement through wind up curved slab and lower edge prestressing force surface plate by steel plate bolt anchoring; The curved slab that winds up is provided with built-in fitting with the junction of lower edge prestressing force surface plate and is connected with collar tie beam;
Described construction method comprises the following steps:
1) presstressed reinforcing steel is arranged: at prefabricated place setting table seat, determining table pier, table top and location-plate size; Table top builds 100 thick C30 concrete base layers, and concrete base layer lays plastic sheeting, and presstressed reinforcing steel is arranged by anchor slab;
2) median septum is prefabricated: median septum is the concrete hollow precast plate of a rectangle mount structure, and the on-the-spot lay-up method that adopts is prefabricated, and median septum upper and lower side reserves anchor bar, left and right sides service sleeve;
3) shuttering supporting is installed: the support of template adopts steel pipe framed bent combining form, and the vertical steel pipe spacing 2m of framed bent is arranged near median septum, and steel pipe top is bending and weld with each vertical steel pipe by the roof truss radian of curved plate that winds up; An arch cover adopts two welding framed bents, and centre steel tube fastener is taken tightly, and the distance between two welding framed bent steel pipes is the width of roof truss;
4) curved slab that winds up makes: the every block 2m of the curved slab side form that winds up, and beats diameter 6mm hole, wait until and be connected with beam bottom board along side form lower limb arc; Core panel nine plywood make, and core two ends nine plywood is beaten diameter 6mm hole, waits until and be connected with median septum template; Make beam bottom board with the wide wooden model of 100mm, the curved circular of bed die makes according to the curved line of beam side and core, finally binds reinforcing bar concreting;
5) median septum is installed: prefabricated median septum is pressed orientation axis and place, and the anchor bar that median septum two ends are reserved anchors in the plate of upper and lower string with in rib; Intert reinforcing bar in median septum service sleeve, reinforcing bar is through curved slab and the lower edge prestressing force surface plate of winding up, and after upper and lower string concreting, it is tight that the reinforcing bar bolt stretched out carries out anchor; Median septum constructs muscle with the curved slab that winds up, lower edge prestressing force surface plate junction by detailing requiments colligation, reserved brace; Before concreting, rush hair machine with high pressure dabbing process is carried out to median septum lower edges concrete surface;
6) lower edge prestressing force surface plate prestressed slab makes: scrape with concrete surface inside lower edge prestressed slab template, and the inboard mould of lower edge forms at median septum contact place by 2 pieces of templates respectively, with nine plywood of wide 100mm, is connected by two pieces of inboard moulds; Then colligation lower edge reinforcing bar, by tension of prestressed tendon after-pouring concrete, finally puts presstressed reinforcing steel, welding brace;
7) tension of prestressed tendon: the presstressed reinforcing steel of lower edge prestressing force surface plate adopts pre-tensioning system and post stretching combination, pre-tensioning system is adopted time prefabricated, then in service sleeve spaced apart, reinforcing bar is inserted, to the reinforced bar stretching in sleeve pipe after arch bar lifting, and be connected with the built-in fitting on collar tie beam;
8) arch roof truss lifting: clear up collar tie beam top and arch bar, after the arch bar demoulding, adopts 4 the suspension ring place liftings of double-machine lifting crane method; After arch bar correction is in place, welded by arch bar with the built-in fitting on collar tie beam, welding should in the welding simultaneously of arch bar diagonal.
2. construction method according to claim 1, is characterized in that: the plate end place of arch roof truss is embedded with steel plate and reserving hole, and make the built-in fitting on collar tie beam pass plate end, collar tie beam and plate end adopt bolt to weld and be connected.
3. construction method according to claim 1, is characterized in that: median septum is banded with structure muscle with the curved slab that winds up, lower edge prestressing force surface plate junction.
4. construction method according to claim 1, is characterized in that: the upper end of steel pipe framed bent is form with the steel-pipe welding of curved slab with radian that wind up, and each pad is at a distance of 2m.
CN201510578558.2A 2015-09-11 2015-09-11 Large-span prestressed arch bar in-situ precast construction method of installation CN105220808B (en)

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CN105696626A (en) * 2016-02-03 2016-06-22 袁根木 Prefabrication method for large longest traffic public pipeline crossing river-sea bottom
CN107100271A (en) * 2017-05-19 2017-08-29 中建局集团建设发展有限公司 A kind of method that utilization adjustable drawbar adjusts steel member camber
CN109162461A (en) * 2018-10-31 2019-01-08 李文华 A kind of lower boom plate placing installation of arch bar concrete pouring construction
CN109184199A (en) * 2018-10-23 2019-01-11 五冶集团上海有限公司 Collar tie beam antitorque Shear Strengthening method when 3m stressed arch-bar cast-in-place construction
CN109281428A (en) * 2018-08-20 2019-01-29 江苏中柢建设集团有限公司 A kind of arch bar construction method of installation
CN110725555A (en) * 2018-07-16 2020-01-24 中铁二十五局集团第二工程有限公司 Prefabricated roof truss hoisting correction method
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CN105696626A (en) * 2016-02-03 2016-06-22 袁根木 Prefabrication method for large longest traffic public pipeline crossing river-sea bottom
CN107100271A (en) * 2017-05-19 2017-08-29 中建局集团建设发展有限公司 A kind of method that utilization adjustable drawbar adjusts steel member camber
CN107100271B (en) * 2017-05-19 2019-04-23 中建一局集团建设发展有限公司 A method of steel member camber is adjusted using adjustable drawbar
CN110725555A (en) * 2018-07-16 2020-01-24 中铁二十五局集团第二工程有限公司 Prefabricated roof truss hoisting correction method
CN109281428A (en) * 2018-08-20 2019-01-29 江苏中柢建设集团有限公司 A kind of arch bar construction method of installation
CN109184199B (en) * 2018-10-23 2021-01-26 五冶集团上海有限公司 Torsion and shear resisting reinforcing method for ring beam in cast-in-place construction of 3m prestressed arch bar
CN109184199A (en) * 2018-10-23 2019-01-11 五冶集团上海有限公司 Collar tie beam antitorque Shear Strengthening method when 3m stressed arch-bar cast-in-place construction
CN109162461A (en) * 2018-10-31 2019-01-08 李文华 A kind of lower boom plate placing installation of arch bar concrete pouring construction
CN111733979A (en) * 2020-07-02 2020-10-02 苏州中材建设有限公司 Large-span steel truss structure of cement production line

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