CN101158145A - Method for mounting trestle bridge segment box girder - Google Patents
Method for mounting trestle bridge segment box girder Download PDFInfo
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- CN101158145A CN101158145A CNA2007101683142A CN200710168314A CN101158145A CN 101158145 A CN101158145 A CN 101158145A CN A2007101683142 A CNA2007101683142 A CN A2007101683142A CN 200710168314 A CN200710168314 A CN 200710168314A CN 101158145 A CN101158145 A CN 101158145A
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- 238000009434 installation Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 14
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- 239000003921 oil Substances 0.000 description 18
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- 238000000465 moulding Methods 0.000 description 2
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- 230000004323 axial length Effects 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The invention relates to an installation method of a viaduct segment box girder, which is characterized in that a mobile crane is adopted, the box girder segment of a front span is vertically lifted in the front of a front bridge pier; a vertically moving cart and a hoister are adopted and move vertically; and a horizontal moving device is adopted to conduct horizontal contraposition adjustment. The invention occupies relatively little traffic rode space and basically does not occupy the space in the two sides of the viaduct.
Description
Technical field
The mounting method that relates to a kind of trestle bridge segment box girder of the present invention.
Background technology
The case beam section of the section box girder of viaduct, monolithic case beam section weigh up to a hundred tons.The length of case beam section equals the width of bridge floor, may reach 10～20 meters, general 2～3 meters of width.One strides usually and forms by 10～20.And must with one stride be in place with interior whole case beam section sections after, put on steel strand, could constitute an integral body of striding after applying prestressing force.If the structure of continuous beam on many supports, one strides the later bridge floor of stretch-draw moulding can only bear deadweight dead load, can't bear the moving load of design, having only next to stride connects together after installation stretch-draw is finished, carry out secondary even three stretch-draw just can reach design load later on, therefore last stride moulding after, next case beam section of striding of the vehicles drive of can not on bridge floor, travelling.If field condition is restricted in addition, as: the width of road both sides, bend is too small, traffic diverging, problems such as spatial altitude adopt the loop wheel machine of bridge formation machine, straddle truck or other form may run into many difficulties.
Summary of the invention
The object of the present invention is to provide the mounting method of the little trestle bridge segment box girder of a kind of construction space.
To achieve these goals, technical scheme of the present invention is: the mounting method of trestle bridge segment box girder is characterized in that it comprises the steps:
1) between 2 adjacent front and back bridge piers longitudinally tower establish first row bracing frame, second row bracing frame, set up first guide rail, second guide rail along first row's bracing frame, second row's bracing frame then, the both ends of first guide rail, second guide rail are arranged on respectively on 2 adjacent bridge piers; Install respectively on first guide rail, second guide rail and vertically move dolly, 2 vertically move dolly and are connected with the haulage cable of hoist engine respectively, and hoist engine is located near the rear abutment place; Before crane is arranged on the axis of front bridge of bridge pier;
2) crane case beam section vertical-lift that trailer is shipped is to the height that surpasses preceding bridge pier, and the top of bridge pier before moving to, the vertically moving on the dolly of first guide rail, second guide rail above the bridge pier before case beam section is dropped to;
3) start hoist engine, the haulage cable of hoist engine vertically moves dolly vertically moving to the rear abutment direction lentamente along viaduct with traction, case beam section moves with vertically moving dolly, and the speed of towing is controlled at 0.5～2 meter/minute carries out, with case beam section towing installation site;
4) repeating step 2) and 3), lift by crane second case beam section, the 3rd case beam section ..., tow to the installation site; With front and back two case beams section is the strong point, and horizontal mobile device is installed, and a case beam section removes and vertically moves dolly in the middle of mentioning, and carries out the adjustment of the lateral attitude of case beam section;
If the installation site of case beam section directly is mounted and fixed on the case beam slab on the bearing of bridge pier with crane on bridge pier;
Whenever after the case beam section that is in place, be in time carry out it and last case beam section bonding and apply interim prestressing force;
One strides installation, and steel strand carries out prestressed stretch-draw; Remove first row's bracing frame, second row's bracing frame after finishing stretch-draw.
The top of bridge pier is provided with built-in fitting, by this built-in fitting first guide rail, second guide rail is connected with bridge pier, to improve the stability of first row's bracing frame, second row's bracing frame.
Characteristics of the present invention:
1, the less road traffic plane that takies.Crane 1 and first row's bracing frame 5, second 10 of the bracing frames of row take the bottom road roughly suitable with the bridge pier width, originally just can not driving vehicle on the bridge pier axis width.Unlike with the side lifting of crane, occupy half of road at bridge.Although can not take ground unlike lower support type bridge formation machine, in the not too high occasion of bridge height, the downward height of girder and gantry crane rail beam may occupy the traffic space of both sides road.Lift if ride on the bridge, more will occupy the road plane beyond the overpass bridge width with portal crane.
2, do not take the space on viaduct both sides substantially.Owing to do not need to use and pass through any device, facility beyond the bridge plate width, bridge plate (case beam section 2) can with the building of road both sides, electric pole, trees stay very near distance.And lower support type bridge formation machine, portal crane and crane be very big space beyond the side lifting must take the viaduct width in the total length of bridge.
3, for the bridge that sets up bend, if radius of curvature less than 400 meters, straight line bridge formation machine can't advance changing when striding.Can only adopt baroque radial type bridge formation machine.Even radial type bridge formation machine has in-plant obstruction on the next door of the bridge at turning, also will hinder passing through of bridge formation machine.Adopt longitudinal moving device of the present invention (2 vertically move 3,1 hoist engines 7 of dolly) to design the structure that adapts to negotiation of bends, will can not produce such problem.The present invention is more or less freely in the bend construction.
4, on the spatial altitude that takies bridge plate (case beam section 2) top, just increased the height of bridge floor to the crane arm top in lifting place part, if there is obstacle in indivedual places, top, can avoid by changing the lifting position of crane on bridge axes.Must take the upper space of bridge total length unlike deck type bridge formation machine.
5, implement method of the present invention, on ground and bridge floor, operate mostly, because it is the huge monster as the bridge formation machine does not move in the high-altitude, comparatively safe.
6, the capital equipment of the present invention's employing is common apparatus mostly, can adopt crawler type or wheeled crane as crane, and first row's bracing frame 5, second row's bracing frame 10 can adopt general scaffold, steel truss or universal rod body; The hydraulic system of horizontal mobile device can be used the Hydraulic Station and the hydraulic jack of prestressed stretch-draw.Compare more economical with employing bridge formation machine.
7, crane of the present invention and arm lift by crane on the axis of case beam section, and case beam section axial length generally only is 2～3 meters, and crane can adopt less brachium and span, and boom can not interfered with the case beam slab yet.If directly the width that plays the box beam slab at side may reach 15～20 meters, interfere in order not make case beam slab and arm, must the large tonnage crane of employing.The ability of the two kinds of required cranes of method in front and back may differ more than one times.
8, utilize bridge pier bearing pad and the rigidity of the case beam section of having installed improves the lateral rigidity and the stability of first row's bracing frame 5, second row's bracing frame 10, by connecting of case beam section and bridge pier, and apply the lateral stability that the frictional force that connects behind the interim prestressing force between all-in-one-piece case beam slab 2 and the guide rail improves first row's bracing frame 5, second row's bracing frame 10.
Description of drawings
Fig. 1 is the scheme of installation of trestle bridge segment box girder of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the structural representation (vertically side-looking, partial cutaway) that vertically moves dolly of the present invention;
Fig. 4 is the upward view of Fig. 3;
Fig. 5 is the right view of Fig. 3;
Fig. 6 is the sectional view of Fig. 3 along the A-A line;
Fig. 7 is the structural representation that the present invention vertically moves the bracing frame of dolly;
Fig. 8 is the schematic diagram that the present invention vertically moves the change roll shaft dolly of dolly;
Fig. 9 is that the present invention vertically moves the state diagram of dolly when using;
Figure 10 is the left view of Fig. 9;
Figure 11 is the structural representation of horizontal mobile device;
Figure 12 is the left view of Figure 11;
Figure 13 is the vertical view of Figure 11;
Figure 14 is the structural representation of vertical-lift oil cylinder;
Among the figure: the 1-crane, 2-case beam section, 3-vertically moves dolly, 4-first guide rail, 5-first row's bracing frame, 6-horizontal mobile device, 7-hoist engine, 8-bridge pier, 9-second guide rail, 10-second row's bracing frame; Leading truck before the left directive wheel before the 11-, 12-, 13-roll shaft dolly, the 14-dolly is adjusted screw, the 15-bracing frame, 16-trolley frame, 17-roll shaft wheel, 18-alignment pin, the 19-dividing plate, leading truck hold-down screw behind the 20-, leading truck behind the 21-, left directive wheel behind the 22-, the 23-leading truck is adjusted screw, leading truck hold-down screw before the right directive wheel before the right directive wheel behind the 24-, 25-, 26-, the 27-back side panel, 28-adjusts hole, 29-front side board, the 30-left plate, 31-panel, 32-right plate;
41-first sleeper, 42-first guide rail beam, the 43-first roll shaft dolly, the 44-first translation jack, 45-horizontal gird, the 46-first vertical-lift oil cylinder (punching oil cylinder), 47-first adjusting nut, 48-first raising rod, the 49-second vertical-lift oil cylinder (punching oil cylinder), 50-second adjusting nut, 51-second raising rod, the 52-second translation jack, the 53-second roll shaft dolly, 54-second guide rail beam, 55-second sleeper, the 56-first raising rod hole.
Arrow among the figure is represented the direction (also can oppositely move) that vertically moves.
The specific embodiment
As shown in Figure 1 and Figure 2, the mounting method of trestle bridge segment box girder, it comprises the steps:
1) between 2 adjacent front and back bridge piers 8 longitudinally tower establish first row's bracing frame 5, second row's bracing frame 10, set up (fixing) first guide rail 4, second guide rail 9 along first row's bracing frame 5, second row's bracing frame 10 then, the both ends of first guide rail 4, second guide rail 9 are arranged on respectively that (top of bridge pier is provided with built-in fitting on 2 adjacent bridge piers 8, by this built-in fitting first guide rail 4, second guide rail 9 are connected with bridge pier, to improve the stability of first row's bracing frame 5, second row's bracing frame 10); Install respectively on first guide rail 4, second guide rail 9 and vertically move 3,2 in dolly and vertically move dolly 3 and be connected with the haulage cable of hoist engine 7 respectively, hoist engine 7 is located near rear abutment 8 places; Before crane 1 (crawler crane or wheeled crane) is arranged on the axis of front bridge of bridge pier; The running block of the wire rope of hoist engine 7 is fixed on the below of the central authorities of case beam section.
2) crane 1 case beam section 2 vertical-lifts that trailer is shipped are to the height that surpasses preceding bridge pier, and the top of bridge pier before moving to, the vertically moving on the dolly 3 of first guide rail 4, second guide rail 9 above the bridge pier before case beam section is dropped to;
3) start hoist engine 7, the haulage cable of hoist engine 7 vertically moves dolly 3 vertically moving to the rear abutment direction lentamente along viaduct with traction, case beam section 2 moves with vertically moving dolly 3, and the speed of towing is controlled at 0.5～2 meter/minute carries out, with case beam section 2 towing installation sites;
4) repeating step 2) and 3), lift by crane second case beam section, the 3rd case beam section ..., tow to the installation site; With front and back two case beams section 2 is the strong point, and horizontal mobile device 6 is installed, and a case beam section 2 removes and vertically moves dolly 3 in the middle of mentioning, and carries out the adjustment of the lateral attitude of case beam section 2;
If the installation site of case beam section is on bridge pier, directly case beam slab 2 is mounted and fixed on the bearing of bridge pier (height of first guide rail 4, second guide rail 9 is lower than the height of bearing, and will add temporary fastening device guard box beam section 2 for the bridge pier sliding support can slippage) with crane 1;
Whenever after the case beam section 2 that is in place, be in time carry out it and last case beam section 2 bonding and apply interim prestressing force;
One strides (being to stride between the adjacent bridge pier 8) installation, and steel strand carries out prestressed stretch-draw; Remove first row's bracing frame 5, second row's bracing frame 10 after finishing stretch-draw.
As Fig. 3, Fig. 4, Fig. 5, Fig. 6, shown in Figure 7, vertically move dolly 3, it comprises leading to device, bracing frame 15, roll shaft dolly 13, back guiding device; Bracing frame 15 is made up of back side panel 27, front side board 29, left plate 30, panel 31, right plate 32, fixedly connected with back side panel 27, front side board 29, left plate 30, right plate 32 respectively (as welding) in four sides of panel 31, back side panel 27, front side board 29, left plate 30, right plate 32 and panel 31 surround the vallecular cavity under the panel 31, be respectively equipped with the hold-down screw screw on front side board 29, the back side panel 27, panel 31 is provided with dowel hole; (roll shaft dolly 13 is 2 among Fig. 3, Fig. 4 longitudinally to be provided with 2 roll shaft dollies 13 in the vallecular cavity under the panel 31 at least, also can adopt 3, or the like), roll shaft dolly 13 comprises trolley frame 16, roll shaft wheel 17 (roll shaft wheel 17 is by chain a plurality of rollers to be linked to be a ring-type), trolley frame 16 is provided with dividing plate 19, roll shaft wheel 17 during use, contacts above the guide rail 4 of the roll shaft of dividing plate 19 belows wheel 17 and H shaped steel on dividing plate 19; Roll shaft dolly 13 by alignment pin 18 penetrate dowel hole on the panel 31, dowel hole and bracing frame 15 on the trolley frame 16 is hinged; Leading to the device fixedly connected with front side board 29, back guiding device is fixedlyed connected with back side panel 27.
Describedly leadingly adjust screws 23 and form by preceding leading truck 12, preceding left directive wheel 11, preceding right directive wheel 25, left short side plate, right short side plate, 2 leading trucks to device, left directive wheel 11, preceding right directive wheel 25 before the lower end of preceding leading truck 12 is interval with, during use, preceding left directive wheel 11, preceding right directive wheel 25 be positioned at H shaped steel guide rail 4 outer side edges and contact with the guide rail 4 of H shaped steel; Before leading truck 12 be positioned at the front side of front side board 29 (before the left side of Fig. 3 is, paper is outward the left side), preceding leading truck 12 is provided with adjusts hole 28, adjustment hole 28 before preceding leading truck 12 is passed by preceding leading truck hold-down screw 26 on the leading truck 12, and fixedly connected with front side board 29 in the hold-down screw screw on the screw-in front side board 29; The leading section of a left side short side plate, right short side plate is fixedlyed connected (as welding) respectively with the left and right sides of the upper end of preceding leading truck 12, the rearward end of left side short side plate, right short side plate is provided with the adjustment screw hole respectively, left side short side plate is positioned at the left side of the left plate 30 of bracing frame 15, the adjustment screw hole that one leading truck adjustment screw 23 passes on the left short side plate contacts with left plate 30, right short side plate is positioned at the right side of the right plate 32 of bracing frame 15, and another leading truck is adjusted screw 23 and passed and adjust screw hole on the right short side plate and contact with right plate 32.Adjust leading truck and adjust screw 23, the lateral attitude of left directive wheel 11, preceding right directive wheel 25 before can changing.
Described back guiding device is adjusted screw 23 and is formed by back leading truck 21, the left directive wheel 22 in back, the right directive wheel 24 in back, left short side plate, right short side plate, 2 leading trucks, the lower end of back leading truck 21 is interval with the left directive wheel 22 in back, the right directive wheel 24 in back, during use, the left directive wheel 22 in back, the right directive wheel 24 in back be positioned at H shaped steel guide rail 4 outer side edges and contact with the guide rail 4 of H shaped steel; Back leading truck 21 is positioned at the rear side of back side panel 27, back leading truck 21 is provided with adjusts hole 28, adjustment hole 28 after back leading truck 21 is passed by back leading truck hold-down screw 20 on the leading truck 21, and fixedly connected with back side panel 27 in the hold-down screw screw that divides on the screw-in back side panel 27; The rearward end of a left side short side plate, right short side plate is fixedlyed connected (as welding) respectively with the left and right sides of the upper end of back leading truck 21, the leading section of left side short side plate, right short side plate is provided with the adjustment screw hole respectively, left side short side plate is positioned at the left side of the left plate 30 of bracing frame 15, the adjustment screw hole that one leading truck adjustment screw 23 passes on the left short side plate contacts with left plate 30, right short side plate is positioned at the right side of the right plate 32 of bracing frame 15, and another leading truck is adjusted screw 23 and passed and adjust screw hole on the right short side plate and contact with right plate 32.Adjust leading truck and adjust screw 23, can change the lateral attitude of the left directive wheel 22 in back, the right directive wheel 24 in back.
Be respectively equipped with former and later two dollies on the left plate 30 at described roll shaft dolly 13 places, the right plate 32 and adjust the screw screw, dolly adjustment screw 14 revolved dolly adjustment screw screw and contacted with the trolley frame 16 of roll shaft dolly 13.As shown in Figure 8, adjust the direction that the overhang of screw 14 can change roll shaft dolly 13 by adjusting dolly.
The back side panel 27 of described bracing frame 15, the upper end of front side board 29 be the upper surface of projecting surface plate 31 respectively.
As Fig. 9, shown in Figure 10, the dolly 3 that vertically moves of the present invention is placed on the guide rail 4 of H shaped steel of bracing frame top, and the case beam section 2 that can carry trestle bridge segment box girder vertically drags with hoist engine 7;
According to the sweep of the guide rail 4 of H shaped steel roll shaft dolly 13 is adjusted to the tangential direction of curve, and directive wheel is carried out laterally adjusting accordingly.Dolly can be walked on curve or rectilinear orbit like this.Roll shaft dolly 13 makes the guide rail 4 that vertically moves dolly 3 and H shaped steel form rolling friction, and remains on the tangential direction of curve (or straight line), has reduced to drag the frictional resistance of case beam section 2; Directive wheel can keep vertically moving dolly and can not de-orbit.
As Figure 11, Figure 12, Figure 13, shown in Figure 14, horizontal mobile device, it is made up of identical lifting and the translating device of two covers;
Lifting and translating device comprise first sleeper 41, first guide rail beam 42, the first roll shaft dolly 43, the first translation jack 44, horizontal gird 45, the first vertical-lift oil cylinder 46, first adjusting nut 47, first raising rod 48, the second vertical-lift oil cylinder 49, second adjusting nut 50, second raising rod 51, the second translation jack 52, the second roll shaft dolly 53, second guide rail beam 54, second sleeper 55; The middle part of horizontal gird 45 has the first raising rod hole 56, the second raising rod hole at interval, the first vertical-lift oil cylinder 46, the second vertical-lift oil cylinder 49 are separately fixed at the middle part of horizontal gird 45, and the hollow via-hole of the first vertical-lift oil cylinder 46 communicates with the first raising rod hole 56, and the hollow via-hole of the second vertical-lift oil cylinder 49 communicates with the second raising rod hole; The top of first raising rod 48, second raising rod 51 is provided with external screw thread, the top of first raising rod 48 is rotary with first adjusting nut 47, hollow via-hole, the first raising rod hole 56 of the first vertical-lift oil cylinder 46 passed in the bottom of first raising rod 48, hollow via-hole, the second raising rod hole of the second vertical-lift oil cylinder 49 passed in the bottom that the top of second raising rod 51 is rotary with second adjusting nut, 50, the second raising rods 51; During use, first adjusting nut 47 contacts with the piston rod of the first vertical-lift oil cylinder 46, the lower end of first raising rod 48 passes preformed hole that case beam section 2 to be adjusted is used to lift by crane, screw on nut fixedlys connected with case beam section 2, second adjusting nut 50 contacts with the piston rod of the second vertical-lift oil cylinder 49, and the lower end of second raising rod 51 passes preformed hole that case beam section 2 to be adjusted is used to lift by crane, screw on nut fixedlys connected with case beam section 2; First raising rod 48, second raising rod 51 are fining twisted steel, and both ends all can screw on nut;
Be provided with the first roll shaft dolly 43 below the leading section of horizontal gird 45, the first roll shaft dolly 43 is positioned on first guide rail beam 42, first guide rail beam 42 is shelved on first sleeper 41, the cylinder body of the first translation jack 44 is fixedlyed connected with first guide rail beam 42, and the piston rod of the first translation jack 44 and the first roll shaft dolly 43 are hinged; Be provided with the second roll shaft dolly 53 below the rearward end of horizontal gird 45, the second roll shaft dolly 53 is positioned on second guide rail beam 54, second guide rail beam 54 is shelved on second sleeper 55, the cylinder body of the second translation jack 52 is fixedlyed connected with second guide rail beam 54, and the piston rod of the second translation jack 52 and the second roll shaft dolly 53 are hinged; The first translation jack 44, the second translation jack 52 are positioned at the same side of horizontal gird 45; During use, first sleeper 41 is shelved on next case beam section to be adjusted, and second sleeper 55 is shelved on the good case beam section of adjusted.
Vertical-lift oil cylinder, translation jack can drive by the electricity consumption brake hydraulic station, also can drive with hydraulic hand-pump.
When Hydraulic Station (pump) to vertical-lift oil cylinder (totally 4) oiling, the piston rod jack-up that makes progress, case beam section to be adjusted is raised by raising rod and adjusting nut, removes the dolly that vertically moves under the case beam section.Four stage translation jack are simultaneously to a direction action, the case beam section that promotes the to be raised adjustment that moves laterally; After adjusting to the right place, vertical-lift oil cylinder oil extraction retraction drops to case beam section on the guide rail that vertically moves.
Claims (2)
1. the mounting method of trestle bridge segment box girder is characterized in that it comprises the steps:
1) between 2 adjacent front and back bridge piers (8) longitudinally tower establish first row bracing frame (5), second row bracing frame (10), set up first guide rail (4), second guide rail (9) along first row's bracing frame (5), second row's bracing frame (10) then, the both ends of first guide rail (4), second guide rail (9) are arranged on respectively on 2 adjacent bridge piers (8); Install respectively on first guide rail (4), second guide rail (9) and vertically move dolly (3), 2 vertically move dolly (3) and are connected with the haulage cable of hoist engine (7) respectively, and hoist engine (7) is located near rear abutment (8) and locates; Before crane (1) is arranged on the axis of front bridge of bridge pier;
2) crane (1) case beam section (2) vertical-lift that trailer is shipped is to the height that surpasses preceding bridge pier, and the top of bridge pier before moving to, the vertically moving on the dolly (3) of first guide rail (4), second guide rail (9) above the bridge pier before case beam section is dropped to;
3) start hoist engine (7), the haulage cable of hoist engine (7) vertically moves dolly (3) vertically moving to the rear abutment direction lentamente along viaduct with traction, case beam section (2) moves with vertically moving dolly (3), the speed of towing is controlled at 0.5～2 meter/minute carries out, with case beam section (2) towing installation site;
4) repeating step 2) and 3), lift by crane second case beam section, the 3rd case beam section ..., tow to the installation site; With front and back two case beams sections (2) is the strong point, and horizontal mobile device (6) is installed, and a case beam section (2) removes and vertically moves dolly (3) in the middle of mentioning, and carries out the adjustment of the lateral attitude of case beam section (2);
If the installation site of case beam section directly uses crane (1) that case beam slab (2) is mounted and fixed on the bearing of bridge pier on bridge pier;
Whenever after the case beam section (2) that is in place, be in time carry out it and last case beam section (2) bonding and apply interim prestressing force;
One strides installation, and steel strand carries out prestressed stretch-draw; Remove first row's bracing frame (5), second row's bracing frame (10) after finishing stretch-draw.
2. the mounting method of trestle bridge segment box girder according to claim 1, it is characterized in that: the top of bridge pier is provided with built-in fitting, by this built-in fitting first guide rail (4), second guide rail (9) is connected with bridge pier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101683142A CN100523383C (en) | 2007-11-08 | 2007-11-08 | Method for mounting trestle bridge segment box girder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101683142A CN100523383C (en) | 2007-11-08 | 2007-11-08 | Method for mounting trestle bridge segment box girder |
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| CN101158145A true CN101158145A (en) | 2008-04-09 |
| CN100523383C CN100523383C (en) | 2009-08-05 |
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| CNB2007101683142A Expired - Fee Related CN100523383C (en) | 2007-11-08 | 2007-11-08 | Method for mounting trestle bridge segment box girder |
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2007
- 2007-11-08 CN CNB2007101683142A patent/CN100523383C/en not_active Expired - Fee Related
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