KR101659500B1 - bridge constructing machine and the method of constructing bridge - Google Patents

bridge constructing machine and the method of constructing bridge Download PDF

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Publication number
KR101659500B1
KR101659500B1 KR1020150186391A KR20150186391A KR101659500B1 KR 101659500 B1 KR101659500 B1 KR 101659500B1 KR 1020150186391 A KR1020150186391 A KR 1020150186391A KR 20150186391 A KR20150186391 A KR 20150186391A KR 101659500 B1 KR101659500 B1 KR 101659500B1
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KR
South Korea
Prior art keywords
barge
bridge
upper plate
main body
plate
Prior art date
Application number
KR1020150186391A
Other languages
Korean (ko)
Inventor
진승원
Original Assignee
아이씨엠 주식회사
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Publication date
Application filed by 아이씨엠 주식회사 filed Critical 아이씨엠 주식회사
Priority to KR1020150186391A priority Critical patent/KR101659500B1/en
Application granted granted Critical
Publication of KR101659500B1 publication Critical patent/KR101659500B1/en

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/28—Barges or lighters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/28—Barges or lighters
    • B63B35/30—Barges or lighters self-discharging
    • B63B35/305—Barges or lighters self-discharging discharging by mechanical means
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B2021/001—Mooring bars, yokes, or the like, e.g. comprising articulations on both ends

Abstract

The present invention relates to a machine and a method of constructing a bridge having a new type of structure which effectively installs an upper plate of a bridge to be constructed by crossing a river. According to the present invention, the machine for constructing a bridge uses a barge (10) to transfer an upper plate (2) and enables to install the upper plate on a pier (1) by lifting the upper plate, thereby having an advantage of accurately installing the upper plate (2) in a short amount of time.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge construction machine,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bridge construction apparatus and a construction method that can effectively install an upper plate of a bridge installed across a river.

Generally, as shown in Fig. 1, bridges are composed of bridge piers installed so as to be spaced apart from each other, and upper plates installed at both ends so as to span the piers.

On the other hand, when constructing or replacing the upper plate of such bridges, the upper plate is manufactured at a separate place and is carried to the place where the bridge is constructed, and then the upper plate is raised or replaced by using a crane or the like.

However, when the upper plate is installed using a crane in this manner, the upper plate must be lifted up by using a plurality of cranes, so that the working time is extremely long.

Particularly, since the crane lifts the upper plate by using the wire, the upper plate is moved in a state where the upper plate is lifted, which makes it difficult to place the upper plate on the exact position of the bridge.

In recent years, a conveying device for a bridge bridge has been developed which can lift the upper plate of the bridge and lift it up to the bridge bridge of the bridge (Patent No. 10-1400302).

The conveying device for the bridge installation comprises a carriage and a support provided on the upper side of the carriage so as to support the upper plate mounted on the upper side.

The bogie includes a plurality of wheels and an engine, and uses a self-propelled vehicle capable of moving along the road.

The support base includes a lift panel on an upper surface of which the upper plate can be placed, and an elevation driving means connected to a lower side of the elevation panel to lift the elevation panel.

The elevation driving means uses a hydraulic cylinder provided to extend in the vertical direction.

Therefore, the truck is moved along the road formed on the land, so that the upper plate is mounted on the bridge pier accurately.

The structure and operation of the conveying device for bridge building are described in detail in the above-mentioned Patent No. 10-1400302, and a detailed description thereof will be omitted.

However, since the conveying device for the bridge installation is moved along the land, the bridge can not be used for construction of a bridge installed across the river.

Therefore, there is a need for a new method to solve such a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bridge construction apparatus with a new structure that can effectively install an upper plate of a bridge installed across a river.

In order to accomplish the above object, the present invention provides a bridge comprising a bridge bridge (1) installed so as to be spaced apart from each other across a river and an upper bridge (2) A support panel 30 provided on the upper side of the barge 10 and lifted and lowered by the elevation driving means 40; A rotary plate 50 rotatably mounted on the upper surface of the support panel 30 and capable of placing the upper plate 2 of the bridge on the upper surface thereof, and a rotary plate 50 connected to the rotary plate 50, The barge line 10 includes a barge main body 11 having a space portion 11a formed therein and a rotation drive means 60 for rotating the barge main body 11 in a downward direction And the lower end thereof is brought into close contact with the bottom surface 3 of the river, An outrigger 12 for supporting the barge 10 in such a manner that the barge 10 maintains the level of the water in the river 11 by supplying water to the inside of the barge main body 11 or discharging water in the space 11a to the outside, And a water supply / drainage device (13) which floats to the bottom of the river or sinks to the bottom of the river.

According to another aspect of the present invention, there is provided a fixing means 20 extending laterally on the upper surface of the barge main body 11 and supported on the circumferential surface of the bridge pier 1 to fix the position of the barge 10 The bridge construction apparatus according to claim 1, further comprising:

According to another aspect of the present invention, the fixing means 20 includes a pair of supports (not shown) that are movable in the front-rear direction on both sides of the barge main body 11 and are adjusted in the forward and backward directions by the forward- A pair of elevating members 22 which are provided on the supporting member 21 so as to be able to move up and down by the elevating means 22a; And a pair of fixing arms 23 supported on the circumferential surface of the bridge pier 1 to fix the barge main body 11 so as not to move. The fixing arm 23 is configured to be stretchable A bridge construction device is provided.

According to another aspect of the present invention, there is provided a method for manufacturing a steel plate, comprising the steps of: placing the barge 10 at an upstream position of a bridge to be installed with a top plate 2 and placing the top plate 2 on the top surface of the rotating plate 50, And the barge line 10 is transferred between the pier 1 to which the upper plate 2 is to be installed so that the fixing arm 23 of the fixing means 20 is fixed to the upstream side circumferential surface of the pierce 1 And water is supplied into the space portion 11a of the barge main body 11 by using the water supply and drainage device 13 so that the barge 10 sinks Adjusting the outrigger 12 so that the barge 10 is leveled and adjusting the outrigger 12 so that the upper plate 2 is positioned on the upper side of the pier 1 using the elevation drive means 40, (30) by using the rotation driving means (60) The supporting panel 30 is lowered by using the elevation driving means 40 so that both ends of the upper plate 2 are pierced by the piercing means 40, (1) of the bridge (1).

The bridge construction apparatus according to the present invention can be installed on the bridge pier 1 after the upper plate 2 is transported by using the barge line 10 and then raised to the upper side so that the upper plate 2 can be installed accurately in a short time There are advantages.

1 is a reference view showing a general bridge,
2 is a side view showing a bridge construction apparatus according to the present invention,
3 is a rear side view showing a bridge construction apparatus according to the present invention,
4 is a plan view showing a bridge construction apparatus according to the present invention,
5 to 11 are reference views illustrating a method of constructing a bridge using the bridge construction apparatus according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 11 illustrate a bridge construction apparatus according to the present invention. The bridge construction apparatus includes a pier 1 installed to be spaced apart from a river at regular intervals, a top plate 2 installed at both ends of the bridge 1, (2) in a bridge constituted by a plurality of bridges.

According to the present invention, the bridge construction apparatus according to the present invention comprises a barge line 10 which floats on a water surface of a river, and a bridge member 10 extending laterally on the upper surface of the barge main body 11, A support panel 30 provided on the upper side of the barge 10 and lifted and raised by the elevation driving means 40; A rotary plate 50 rotatably mounted on the upper surface of the rotary plate 50 so as to allow the upper plate 2 of the bridge to be placed on the upper surface thereof, And driving means (60).

The barge 10 includes a barge main body 11 having a space portion 11a formed therein and a lower end portion of the barge main body 11 extending and retracting from the bottom of the barge main body 11, An outrigger 12 adhered to the barge main body 11 to support the barge main body 11 so as to keep the barge main body 11 horizontal and a water supply and drainage device 13 provided in the barge main body 11.

The barge main body 11 is made of a metallic material having a high strength so as to support the weight of the top plate 2 and is configured to be able to move using a separate power line.

The outrigger 12 includes a horizontally extending portion 12a which is laterally protruded from the circumference of the barge main body 11 and slidable laterally by an unillustrated hydraulic cylinder, And a lifting bar 12c vertically extended from the vertical extension 12b and lifted and lowered by an unillustrated hydraulic cylinder.

At this time, the outriggers 12 are provided at the front and rear ends of the barge main body 11, respectively. The outriggers 12 are disposed at the front and rear ends of the barge main body 11, respectively. In the state where the barge main body 11 sinks to the bottom of the river, When the elevation bar 12c is lowered after the horizontally extending portion 12a is protruded outward, the lower end of the elevation bar 12c is brought into close contact with the bottom surface 3 of the river to push up the barge main body 11 upward So that the barge main body 11 can be adjusted to be horizontal.

The water supply and drainage device 13 is installed in the barge main body 11 and is connected to the space portion 11a and supplies water of the river into the space portion 11a of the barge 10 through the connection pipe 13a Or a water pump for discharging the water stored in the space portion 11a of the barge 10 to the outside by supplying water to the inside of the barge main body 11 so that the barge 10 sinks to the bottom of the river Or discharging the water inside the space portion 11a to the outside so that the barge line 10 floats to the water surface of the river.

The fixing means 20 includes a pair of support members 21 which are movable in forward and backward directions on both sides of the barge main body 11 and whose positions are adjusted in forward and backward directions by forward and backward driving means 21a, A pair of elevating members 22 which are vertically provided on the elevating member 21 so as to be elevated by the elevating means 22a and a pair of elevating members 22 which are provided to extend laterally in the elevating member 22, And a pair of fixing arms 23 for supporting the barge main body 11 so as not to move.

To this end, guide rails 11b extending in the forward and backward directions are provided on both sides of the upper surface of the barge main body 11.

The pair of support members 21 are configured to extend in the vertical direction and the lower ends thereof are slidably coupled to the guide rails 11b in the forward and backward directions.

The forward and backward driving means 21a and the elevating means 22a use hydraulic cylinders connected to the pair of supporting members 21 and the pair of elevating members 22.

The pair of fixing arms 23 has a fixing portion 23a having a proximal end extending laterally to the elevating member 22 and a fixing portion 23a slidably coupled to the fixing portion 23a in the lateral direction, And a slide portion 23b that slides laterally by a hydraulic cylinder not shown. The hydraulic cylinder is expanded and contracted to slide the slide portion 23b laterally so that the entire length can be expanded and contracted.

The support panel 30 is made of a metal material having high strength.

The elevation driving means 40 uses a plurality of hydraulic cylinders which are arranged to extend in the vertical direction and whose lower ends are fixed to the upper surface of the barge main body 11 and upper ends thereof are fixed to the lower side of the support panel 30.

At this time, the hydraulic cylinder uses a sufficiently large size so as to support the weight of the support panel 30, the rotary plate 50 and the upper plate 2, and to push up the support plate 30 upward.

The rotation plate 50 is rotatably coupled to the upper side of the support panel 30 by a rotation axis 51 extending downward from the center.

At this time, on the upper surface of the support panel 30, a bearing 31 supporting the lower circumferential portion of the rotary plate 50 is provided.

The rotary drive means 60 uses a hydraulic motor connected to the rotary shaft 51 to rotate the rotary plate 50 in the lateral direction.

A method of installing the top plate 2 on the bridge pier 1 using the bridge construction apparatus constructed as described above will be described below.

5 and 6, the barge 10 is moved to the upstream position of the bridge pier 1 on which the upper plate 2 is to be installed, The upper plate 2 is placed on the upper surface of the upper plate 2.

At this time, the support panel 30 and the rotary plate 50 are lowered, and the upper plate 2 is disposed on the upper surface of the rotary plate 50 so as to extend in the front-rear direction.

The length of the pair of fixing arms 23 is adjusted to correspond to the distance between the bridge piers 1 to which the upper plate 2 is to be mounted and then the barge line 10 is connected to the barge 10 by a power line connected to the barge 10. [ So that the barge 10 is positioned between the bridge piers 1 on which the upper plate 2 is to be placed, as shown in Figs. 7 and 8.

When the barge 10 is positioned between the bridge piers 1, the front surface of the fixed arm 23 extending to both sides of the barge main body 11 is brought into close contact with the upstream side circumferential surface of the bridge bridge 1, (10) is fixed so as not to move.

At this time, the barge 10 flows to the downstream side according to the flow of the water flowing in the river. When the fixing arm 23 is in close contact with the upstream circumferential surface of the bridge pier 1, (23) is continuously pushed toward the bridge pier (1) to firmly fix the barge (10) so that it does not move.

When the lengths of the fixed arms 23 extending to the left and right sides of the barge main body 11 are expanded and contracted opposite to each other in a state where the barge 10 is fixed as described above, When the left and right support members 21 are slid in the front and rear direction using the forward and backward driving means 21a, the position of the barge main body 11 is adjusted in the forward and backward directions.

Thus, by adjusting the front, back, and left and right positions of the barge main body 11, it is possible to adjust the front, rear, and left and right positions of the pier 1 mounted on the rotary plate 50.

9, after the position of the pier 1 mounted on the rotary plate 50 is adjusted, the space portion 11a of the barge main body 11 is opened by using the water supply and drainage device 13, So that the barge 10 is submerged and the outrigger 12 is adjusted to adjust the barge 10 so that it sinks horizontally.

That is, when water is supplied to the space portion 11a of the barge main body 11, the specific gravity of the barge main body 11 becomes larger than the water, and the barge line 10 sinks below the water surface of the river.

At this time, the bottom surface 3 of the river is bent instead of horizontally, so that the elevating bar 12c of the outrigger 12 is lifted and lowered in accordance with the bent state of the bottom surface 3, The barge line 10 can be adjusted to be horizontal while the barge line 10 sinks below the water surface so that the lower end of the barge line 10 contacts the bottom surface 3. [

On the other hand, when the barge 10 sinks to the bottom of the river in this way. The elevation member 22 of the fixing means 20 is elevated so that the fixing arm 23 together with the barge 10 can be moved in the vertical direction with the speed at which the barge 10 sinks, And the fixing frame is kept fixed to the bridge pier 1. In this case,

10, when the barge 10 is fixed so as to be horizontal to the bottom surface 3, the upper plate 2 is moved upward from the pier 1 using the elevation driving means 40 11, when the support panel 30 and the rotary plate 50 are completely lifted up, the support panel 30 and the rotary plate 50 are lifted up to a position where the rotary plate 50 and the upper plate 2 are rotated by 90 degrees so that the upper plate 2 is arranged to extend in the lateral direction.

When the upper plate 2 is rotated as described above, both ends of the upper plate 2 are positioned so as to correspond to positions where the upper plate 2 is to be raised from the upper surface of the pier 1. [

When the support panel 30 and the rotary plate 50 are lowered using the elevation drive means 40, both ends of the upper plate 2 are installed on the bridge pier 1. [

The bridge construction apparatus constructed as described above can transfer the upper plate 2 by using the barge line 10 and then lift it up to the bridge pier 1. This makes it possible to install the upper plate 2 accurately in a short time .

Particularly, the barge 10 is supported by the support panel 30, the turntable 50, and the top plate 2 by using the elevation driving means 40 in a silver state in the river so that the outrigger 12 is supported on the bottom surface. So that it is possible to effectively prevent the barge 1 from being shaken by the water flowing in the river, and the upper plate 2 can be installed more accurately.

A fixing means 20 extending laterally from the upper surface of the barge main body 11 and supported on the circumferential surface of the bridge pier 1 to fix the position of the barge 10 is provided, (20) is provided with a pair of support members (21) movable on both sides of the barge main body (11) in the forward and backward direction and being adjusted in the forward and backward directions by the forward and backward driving means (21a) A pair of elevating members 22 which are vertically movable up and down by the elevating means 22a and are supported on the circumferential surface of the pier 1 so as to extend laterally in the elevating member 22 And a pair of fixed arms 23 for fixing the barge main body 11 so as not to move.

Therefore, the left and right fixing arms 23 are firmly fixed to the circumferential surface of the pier 1 so that the barge 10 can be firmly fixed so as not to move before the barge 1 sinks to the bottom of the river The length of the left and right fixing arms 23 is extended and the position of the left and right support arms 21 is adjusted by sliding the left and right support members 21 in the forward and backward directions using the forward and backward driving means 21a, There is an advantage in that the position of the raised pier 1 can be adjusted in the front, back, and left and right directions.

10. Barge 20. Securing means
30. Support panel 40. Elevation drive means
50. Rotating plate 60. Rotating drive means

Claims (3)

1. A bridge installation apparatus for installing the upper plate (2) in a bridge composed of a bridge bridge (1) installed so as to be spaced apart from each other across a river and an upper plate (2)
A barge 10 floated above the water surface of the river,
A support panel (30) provided on the barge (10) and elevated by the elevation driving means (40)
A rotary plate 50 rotatably mounted on an upper surface of the support panel 30 and capable of placing a top plate 2 of a bridge on an upper surface thereof,
And rotation driving means (60) connected to the rotation plate (50) and rotating the rotation plate (50) in the lateral direction,
The barge (10)
A barge main body 11 having a space portion 11a formed therein,
An outrigger 12 provided at a periphery of the barge main body 11 so as to extend downward and to be in close contact with a bottom surface 3 of the river to support the barge main body 11 in a horizontal direction,
A water supply and drainage device 13 for supplying water into the inside of the barge main body 11 or discharging water inside the space part 11a to the outside so that the barge 10 floats to the surface of the river or sinks to the bottom of the river ),
And a fixing means 20 extending laterally from the upper surface of the barge main body 11 and supported by the circumferential surface of the bridge pier 1 to fix the position of the barge 10,
The fixing means (20)
A pair of support members 21 which are movable in forward and backward directions on both sides of the barge main body 11 and whose positions are adjusted in forward and backward directions by forward and backward driving means 21a,
A pair of elevating members 22 which are vertically movable on the supporting member 21 and are lifted by the elevating means 22a,
And a pair of fixing arms 23 extending laterally from the elevating member 22 and supported on the circumferential surface of the bridge pier 1 to fix the barge main body 11 so as not to move,
Wherein the fixed arm (23) is configured to be stretchable and contractible.
delete A method for installing an upper plate (2) of a bridge on a bridge pier (1) using the bridge construction apparatus according to claim 1,
Placing the barge (10) at an upstream position of a bridge to which the upper plate (2) is to be installed and placing the upper plate (2) so as to extend in the longitudinal direction on the upper surface of the rotating plate (50)
The barge line 10 is transferred between the pier 1 to which the upper plate 2 is to be installed so that the fixing arm 23 of the fixing means 20 is tightly fixed to the upstream side circumferential surface of the pierce 1, 10) so as not to move,
Water is supplied into the space portion 11a of the barge main body 11 by using the water supply and drainage device 13 so that the barge line 10 sinks and the outrigger 12 is adjusted, (10) to be horizontal,
Raising the support panel (30) so that the upper plate (2) is positioned above the bridge pier (1) by using the elevation drive means (40)
Rotating the rotary plate (50) and the upper plate (2) using the rotary drive means (60) so that the upper plate (2) extends in the lateral direction;
And lowering the support panel (30) by using the elevation driving means (40) so that both ends of the upper plate (2) are raised on the bridge pier (1).
KR1020150186391A 2015-12-24 2015-12-24 bridge constructing machine and the method of constructing bridge KR101659500B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180103459A (en) * 2017-03-10 2018-09-19 삼성중공업 주식회사 Floating crane and method for operating the same
CN112030776A (en) * 2020-08-25 2020-12-04 中铁大桥局第七工程有限公司 Bridge floating-towing erection method
CN113417221A (en) * 2021-07-24 2021-09-21 陈忠辉 First-aid device for bridge fracture
CN114214970A (en) * 2021-12-08 2022-03-22 江苏省交通工程集团有限公司 Suspension construction platform for bridge construction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990037939A (en) * 1999-02-25 1999-05-25 김응천 A method of upper plate installation on the pier of a bridge above the water and a barge for loading upper plate
KR100682344B1 (en) * 2005-08-03 2007-02-15 명보산공 주식회사 Rotation Apparatus of constructing temporary bridge
KR20150123596A (en) * 2014-04-25 2015-11-04 건국대학교 산학협력단 Jack-up barge with extendable offshore cable stayed bridges that can be rotate in upper and lower, left and right direction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990037939A (en) * 1999-02-25 1999-05-25 김응천 A method of upper plate installation on the pier of a bridge above the water and a barge for loading upper plate
KR100682344B1 (en) * 2005-08-03 2007-02-15 명보산공 주식회사 Rotation Apparatus of constructing temporary bridge
KR20150123596A (en) * 2014-04-25 2015-11-04 건국대학교 산학협력단 Jack-up barge with extendable offshore cable stayed bridges that can be rotate in upper and lower, left and right direction

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180103459A (en) * 2017-03-10 2018-09-19 삼성중공업 주식회사 Floating crane and method for operating the same
KR101954716B1 (en) * 2017-03-10 2019-03-06 삼성중공업 주식회사 Floating crane and method for operating the same
CN112030776A (en) * 2020-08-25 2020-12-04 中铁大桥局第七工程有限公司 Bridge floating-towing erection method
CN113417221A (en) * 2021-07-24 2021-09-21 陈忠辉 First-aid device for bridge fracture
CN114214970A (en) * 2021-12-08 2022-03-22 江苏省交通工程集团有限公司 Suspension construction platform for bridge construction
CN114214970B (en) * 2021-12-08 2023-12-22 江苏省交通工程集团有限公司 Suspension construction platform for bridge construction

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