CN111827105A - Combined type bridge expansion joint device - Google Patents
Combined type bridge expansion joint device Download PDFInfo
- Publication number
- CN111827105A CN111827105A CN202010740654.3A CN202010740654A CN111827105A CN 111827105 A CN111827105 A CN 111827105A CN 202010740654 A CN202010740654 A CN 202010740654A CN 111827105 A CN111827105 A CN 111827105A
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- Prior art keywords
- expansion joint
- plate
- flat plate
- pressing plate
- belt
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 238000003825 pressing Methods 0.000 claims abstract description 35
- 238000004873 anchoring Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 17
- 239000010935 stainless steel Substances 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 229910000838 Al alloy Inorganic materials 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 229920000295 expanded polytetrafluoroethylene Polymers 0.000 claims description 5
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 5
- 230000032683 aging Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Images
Classifications
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/40—Plastics
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Road Paving Structures (AREA)
Abstract
The invention belongs to the technical field of expansion joints, and particularly relates to a composite bridge expansion joint device. The structure of the expansion joint comprises L-shaped steel symmetrically arranged in two side beam bodies of the expansion joint, a flat plate of the L-shaped steel is combined with a pressing plate on the flat plate to seal and fix an ear belt at the side edge of the water stop belt, a fastening bolt penetrates through the pressing plate, the ear belt and the flat plate and locks the pressing plate on the flat plate through a first limiting mechanism, and an elastic sealing gasket is arranged between the pressing plate and the ear belt and/or between the ear belt and the flat plate; the vertical plate of the L-shaped steel is attached to the side wall of the reserved notch of the beam body, and the outer side of the vertical plate is connected with the anchoring steel bar through a second limiting mechanism. The composite bridge expansion joint device can quickly install and position the water stop belt, is convenient to install and detach the cavity anchoring, and has the characteristics of firm connection, rigorous sealing and long service life.
Description
Technical Field
The invention belongs to the technical field of expansion joints, and particularly relates to a composite bridge expansion joint device.
Background
The bridge expansion joint device is arranged between adjacent beam ends or at the expansion joint between a beam body and a bridge abutment breast wall, plays a role in adapting to beam end deformation and waterproofing, and is an important accessory of a bridge. The performance of the anti-corrosion bridge can meet the requirement that the bridge can freely stretch in two directions of parallel and vertical bridge axes, and can prevent rainwater and garbage soil from permeating and blocking a telescopic structure, particularly prevent rainwater and sewage from flowing into a beam end and prevent the end sealing of a prestressed anchor head of the beam end, and prevent the corrosion of the prestressed anchor from influencing the service life of a beam body.
Most of the existing railway bridge expansion devices are composed of anchoring profiled bars arranged at two sides of an expansion joint and a rubber water stop connected between the two, wherein the anchoring profiled bars are provided with cavities for accommodating lug belts at the side edges of the rubber water stop, and the lug belts are embedded and pressed in the cavities for sealing. The waterproof belt used at present is made of rubber, the rubber has an aging phenomenon, so that the waterproof performance is reduced or the waterproof performance is invalid, and the maintenance period and the service life are short. Although removable rubber waterstop is in removable expansion joint, the installation construction is more with the supplementary utensil that needs when changing rubber waterstop and dismantling, construction process is also very loaded down with trivial details, wastes time and energy, and the work progress occupies a large amount of manpower and materials, has increased use and maintenance cost.
The invention patent with the application number of CN202010092562.9 discloses an easily-replaced rotating shaft type bridge expansion joint device, wherein a pin shaft hole used for being hinged with one end of an upper part is formed in the top of profile steel of the device, a clamping groove used for being clamped with a rubber water stop is formed in one side wall, close to the expansion joint, of a lower part, one end of the upper part is hinged with the top of the lower part, the other end of the upper part is used for pressing two ends of the rubber water stop, the structure is simple and easy to construct, replacement is convenient after damage, and the difficulty of maintenance and replacement. However, the cavity for positioning the water stop is essentially still of a clamping groove structure, and the ear belt of the water stop needs to be forcibly plugged into the cavity, so that the process is troublesome in operation and long in construction period, and an auxiliary tool is needed, so that the installation cost is increased; secondly, the upper portion and the lower part of its shaped steel adopt articulated, connect the compactness not high, fix a position insecure, need regularly overhaul in the use, have influenced the normal work of bridge expansion joint.
Disclosure of Invention
The invention aims to provide a composite bridge expansion joint device which can quickly install and position a water stop belt, is convenient and quick to install and detach a cavity anchor, is firm in connection and is precise in sealing.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a combined type bridge expansion joint device which characterized in that: the expansion joint comprises L-shaped steel symmetrically arranged in two side beam bodies of the expansion joint, a flat plate of the L-shaped steel is combined with a pressing plate on the flat plate to seal and fix a side edge ear belt of the water stop belt, a fastening bolt penetrates through the pressing plate, the ear belt and the flat plate and locks the pressing plate on the flat plate through a first limiting mechanism, and an elastic sealing gasket is arranged between the pressing plate and the ear belt and/or between the ear belt and the flat plate; the vertical plate of the L-shaped steel is attached to the side wall of the reserved notch of the beam body, and the outer side of the vertical plate is connected with the anchoring steel bar through a second limiting mechanism.
The additional technical characteristics of the composite bridge expansion joint device also comprise:
the first limiting mechanism comprises a clamping groove arranged at the bottom of the flat plate, the clamping groove is used for positioning a nut of the fastening bolt, and a screw rod of the fastening bolt penetrates through the pressing plate, the lug belt and the platform and then is connected with a screwing nut;
the second limiting mechanism comprises an anchoring cavity arranged on the outer side of the vertical plate, the anchoring cavity is in a dovetail groove shape, a trapezoidal nut matched with the dovetail groove is placed inside the anchoring cavity, a locking nut is arranged outside the anchoring cavity, and the trapezoidal nut and the locking nut are both in threaded connection with the anchoring steel bar;
the L-shaped steel and the trapezoidal nut are made of aluminum alloy, and a bolt hole matched with the fastening bolt is formed in the flat plate of the section steel; the fastening bolt and the locking nut are made of stainless steel; the pressing plate is made of aluminum alloy or stainless steel, and bolt holes matched with the fastening bolts are formed in the pressing plate;
the elastic sealing gasket is a belt body made of expanded polytetrafluoroethylene, and a positioning hole for the fastening bolt to penetrate through is formed in the elastic sealing gasket;
the waterstop is made of a modified polytetrafluoroethylene plate, a vinylidene fluoride plate or a stainless steel sheet;
the water stop belt positioned in the expansion joint is of an expansion structure with a wavy cross section.
Compared with the prior art, the composite bridge expansion joint device provided by the invention has the following advantages: firstly, the L-shaped steel of the bridge expansion joint device comprises a flat plate for fixing the side ear bands of the water stop band, and compared with a side opening of a common anchoring type steel structure, the flat plate of the L-shaped steel is used for positioning and connecting the water stop band in an open mode, so that the construction and installation are convenient, and the maintenance and the replacement of the water stop band are convenient; secondly, the pressing plate penetrates through the pressing plate, the lug belt and the platform through the fastening bolt and is locked on the flat plate through the first limiting mechanism, so that the water stop belt is fixed, the pressing plate can be pressed and compacted on the flat plate to the greatest extent by adopting a thread fastening mode, the water stop belt is positioned more firmly, and the sealing effect is better; the L-shaped steel further comprises a vertical plate attached to the side wall of the reserved notch of the beam body, the outer side of the L-shaped steel is connected with the anchoring steel bars through a second limiting mechanism, the L-shaped steel can be stably laid in the reserved groove in the end portion of the beam body, the flat plate and the vertical plate of the L-shaped steel are independent in function, a combined type body combined tightly is formed, the structural strength of the telescopic device is improved, the service life is prolonged, the installation and construction are convenient, manpower and material resources are saved, and the use cost of the telescopic device is reduced.
Drawings
FIG. 1 is a schematic view of a composite expansion joint device for bridges according to the present invention;
fig. 2 is a schematic view of the L-shaped steel connection structure of the composite bridge expansion joint device.
Detailed Description
Referring to fig. 1 and 2, there are shown schematic structural diagrams of a composite bridge expansion joint device according to the present invention. The structure of the composite bridge expansion joint device comprises L-shaped steel 1 symmetrically arranged in beam bodies b on two sides of an expansion joint a, a flat plate 11 of the L-shaped steel 1 is combined with a pressing plate 2 on the flat plate to seal and fix a water stop belt c side ear belt c1, a fastening bolt 7 penetrates through the pressing plate 2, the ear belt c1 and the flat plate 11 and locks the pressing plate 2 on the flat plate 11 through a first limiting mechanism 4, and an elastic sealing gasket 3 is arranged between the pressing plate 2 and the ear belt c1 and/or between the ear belt c1 and the flat plate 11; the vertical plate 12 of the L-shaped steel 1 is attached to the side wall of the reserved notch d of the beam body b, and the outer side of the vertical plate 12 is connected with the anchoring reinforcing steel bar 6 through the second limiting mechanism 5.
The working principle is as follows: the L-shaped steel 1 is symmetrically arranged in a reserved notch d at the end part of a beam body b, a vertical plate 12 of the L-shaped steel is attached to the side wall of the reserved notch d, an ear belt c1 and a pressing plate 2 on the side edge of a water stop belt c are sequentially placed on a flat plate 11 of the L-shaped steel, an elastic sealing gasket 3 can be arranged above an ear belt c1 or below the ear belt c1, the pressing plate 2, the ear belt c1, the flat plate 11 and the elastic sealing gasket 3 are penetrated through by a fastening bolt 7 and are tightly pressed and compacted through a first limiting mechanism 4, and the water stop belt c is sealed and positioned; the outside of riser 12 is connected with anchor reinforcing bar 6 through second stop gear 5, and anchor reinforcing bar 6 is connected with reserved reinforcing bar 9 in the roof beam body b, realizes L shaped steel 1, waterstop c's overall positioning.
In the structure constituting the above-mentioned composite type bridge expansion joint device,
in order to fasten the pressing plate 2 on the flat plate 11 of the L-shaped steel 1 quickly, the first limiting mechanism 4 includes a clamping groove 41 formed in the bottom of the flat plate 11, the clamping groove 41 is used for positioning a nut 71 of the fastening bolt 7, a screw 72 of the fastening bolt 7 penetrates through the pressing plate 2, the ear belt c1 and the platform and then is connected with a screwing nut 42, namely, the fastening bolt 7 is in an inverted shape, during construction, the fastening bolt 7 is inserted from the bottom (through hole) of the flat plate 11, the nut 71 is clamped and fixed in the clamping groove 41, the ear belt c1, the pressing plate 2 and the elastic sealing gasket 3 are arranged on the platform, the screw 72 of the fastening bolt 7 penetrates through the fastening bolt and then is connected with the screwing nut 42, the screwing nut 42 is rotated to extrude the pressing plate 2, and the sealing and positioning of the water stop belt c are realized, and the first limiting mechanism 4 is simple in structure;
preferably, the second limiting mechanism 5 includes an anchoring cavity 51 arranged on the outer side of the vertical plate 12, the anchoring cavity 51 is shaped like a dovetail groove, a trapezoidal nut 52 matched with the dovetail groove is placed inside the anchoring cavity 51, a locking nut 53 is arranged outside the anchoring cavity 51, both the trapezoidal nut 52 and the locking nut 53 are in threaded connection with the anchoring steel bar 6, the anchoring cavity 51 and the anchoring steel bar 6 are in a detachable connection mode, so that construction, maintenance and replacement are facilitated, the anchoring steel bar 6 is inserted into the trapezoidal nut 52 in the dovetail groove and screwed, and the locking nut 53 is fastened on the outer side of the dovetail groove, so that the anchoring cavity 51 and the anchoring steel bar 6 are connected and fixed;
the L-shaped steel 1 and the trapezoidal nut 52 are made of aluminum alloy, the fastening bolt 7, the screwing nut 42 and the locking nut 53 are made of stainless steel, and the pressing plate 2 is made of aluminum alloy or stainless steel, so that the aluminum alloy and stainless steel have good weather resistance, high mechanical strength, long service life and stable working performance, the working time of the telescopic device is integrally prolonged, and even the whole life cycle of the telescopic device with a bridge expansion joint a is realized; the flat plate 11 and the pressing plate 2 of the section steel are both provided with bolt holes matched with the fastening bolts 7, so that the threaded connection structure of the pressing plate 2, the flat plate 11 and the anchoring steel bar 6 is firmer, the slipping and loosening are not easy to occur, and the connection strength is higher;
as a preferred embodiment, the elastic sealing gasket 3 is a belt body made of expanded polytetrafluoroethylene, and a positioning hole for penetrating the fastening bolt 7 is arranged on the belt body, the expanded polytetrafluoroethylene has good flexibility, compression resilience, creep resistance, high and low temperature resistance, excellent corrosion resistance, aging resistance and self-lubrication, the sealing gasket made of expanded polytetrafluoroethylene has special physical and chemical properties, has the flexibility similar to cotton and nylon, high compressibility, excellent acid and alkali resistance, cold flow resistance, creep resistance, aging resistance and high tensile strength, changes the traditional static sealing use mode from the form, can be combined at will, can be changed into gaskets with any thickness and any cross section area according to the working environment condition, does not need to be processed in advance, and has cheap production and construction aspects and strong flexibility;
furthermore, the water stop belt c is made of a modified polytetrafluoroethylene plate, a vinylidene fluoride plate or a stainless steel sheet, so that the structural strength of the water stop belt c is improved, the working period is long, the same service life as that of the beam body b is ensured, the maintenance-free performance of the telescopic device in the whole service life cycle of the bridge is realized, the use cost is saved, and the economic benefit of the railway bridge is improved;
in order to adapt to the angle and width change of the bridge expansion joint a, the water stop c positioned in the expansion joint a is a telescopic structure 8 with a wavy cross section, and the telescopic structure 8 has certain toughness and space telescopic performance, so that the deformation capacity and the service cycle of the water stop c are improved, and the waterproof effect of the bridge expansion joint a is enhanced.
Claims (7)
1. The utility model provides a combined type bridge expansion joint device which characterized in that: the expansion joint comprises L-shaped steel symmetrically arranged in two side beam bodies of the expansion joint, a flat plate of the L-shaped steel is combined with a pressing plate on the flat plate to seal and fix a side edge ear belt of the water stop belt, a fastening bolt penetrates through the pressing plate, the ear belt and the flat plate and locks the pressing plate on the flat plate through a first limiting mechanism, and an elastic sealing gasket is arranged between the pressing plate and the ear belt and/or between the ear belt and the flat plate; the vertical plate of the L-shaped steel is attached to the side wall of the reserved notch of the beam body, and the outer side of the vertical plate is connected with the anchoring steel bar through a second limiting mechanism.
2. The composite bridge expansion joint assembly of claim 1, wherein: the first limiting mechanism is arranged on the clamping groove in the bottom of the flat plate, the clamping groove is used for positioning a nut of the fastening bolt, and a screw rod of the fastening bolt penetrates through the pressing plate, the ear belt and the platform and then is connected with a nut to be screwed.
3. The composite bridge expansion joint assembly of claim 1 or 2, wherein: the second limiting mechanism comprises an anchoring cavity arranged on the outer side of the vertical plate, the anchoring cavity is in a dovetail groove shape, a trapezoidal nut matched with the dovetail groove is placed inside the anchoring cavity, a locking nut is arranged outside the anchoring cavity, and the trapezoidal nut and the locking nut are both in threaded connection with the anchoring reinforcing steel bar.
4. The composite bridge expansion joint installation of claim 3, wherein: the L-shaped steel and the trapezoidal nut are made of aluminum alloy, and a bolt hole matched with the fastening bolt is formed in the flat plate of the section steel; the fastening bolt and the locking nut are made of stainless steel; the pressing plate is made of aluminum alloy or stainless steel, and bolt holes matched with the fastening bolts are formed in the pressing plate.
5. The composite bridge expansion joint assembly of claim 1, wherein: the elastic sealing gasket is a belt body made of expanded polytetrafluoroethylene, and a positioning hole for the fastening bolt to penetrate through is formed in the elastic sealing gasket.
6. The composite bridge expansion joint assembly of claim 1, wherein: the water stop is made of a modified polytetrafluoroethylene plate, a vinylidene fluoride plate or a stainless steel sheet.
7. The composite bridge expansion joint installation of claim 6, wherein: the water stop belt positioned in the expansion joint is of a telescopic structure with a wavy cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010740654.3A CN111827105A (en) | 2020-07-29 | 2020-07-29 | Combined type bridge expansion joint device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010740654.3A CN111827105A (en) | 2020-07-29 | 2020-07-29 | Combined type bridge expansion joint device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111827105A true CN111827105A (en) | 2020-10-27 |
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ID=72919859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010740654.3A Pending CN111827105A (en) | 2020-07-29 | 2020-07-29 | Combined type bridge expansion joint device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111827105A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114232470A (en) * | 2022-01-18 | 2022-03-25 | 赵发强 | Bridge expansion device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201137039Y (en) * | 2007-12-14 | 2008-10-22 | 于泳湖 | Slag-free bridge expansion joint device |
| KR20110020526A (en) * | 2009-08-24 | 2011-03-03 | 주식회사 일원테크 | Expansion joint for railroad bridges and this construction technique |
| CN207244444U (en) * | 2017-10-06 | 2018-04-17 | 衡水中铁建工程橡胶有限责任公司 | A kind of bridge expanssion joint waterproof sealing structure and its expansion gap device |
| CN111139735A (en) * | 2020-03-10 | 2020-05-12 | 河北远征环保科技有限公司 | Bridge expansion device |
| CN111395159A (en) * | 2020-05-14 | 2020-07-10 | 衡水中铁建工程橡胶有限责任公司 | Anchoring section bar of rubber waterstop and bridge expansion joint waterproof structure |
| CN212223591U (en) * | 2020-07-29 | 2020-12-25 | 中国铁路设计集团有限公司 | Combined type bridge expansion joint device |
-
2020
- 2020-07-29 CN CN202010740654.3A patent/CN111827105A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201137039Y (en) * | 2007-12-14 | 2008-10-22 | 于泳湖 | Slag-free bridge expansion joint device |
| KR20110020526A (en) * | 2009-08-24 | 2011-03-03 | 주식회사 일원테크 | Expansion joint for railroad bridges and this construction technique |
| CN207244444U (en) * | 2017-10-06 | 2018-04-17 | 衡水中铁建工程橡胶有限责任公司 | A kind of bridge expanssion joint waterproof sealing structure and its expansion gap device |
| CN111139735A (en) * | 2020-03-10 | 2020-05-12 | 河北远征环保科技有限公司 | Bridge expansion device |
| CN111395159A (en) * | 2020-05-14 | 2020-07-10 | 衡水中铁建工程橡胶有限责任公司 | Anchoring section bar of rubber waterstop and bridge expansion joint waterproof structure |
| CN212223591U (en) * | 2020-07-29 | 2020-12-25 | 中国铁路设计集团有限公司 | Combined type bridge expansion joint device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114232470A (en) * | 2022-01-18 | 2022-03-25 | 赵发强 | Bridge expansion device |
| CN114232470B (en) * | 2022-01-18 | 2024-02-02 | 赵发强 | Bridge telescoping device |
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Address after: No. 201, Ligang building, No. 82, West 2nd Road, Tianjin Binhai New Area pilot free trade zone (Airport Economic Zone) Applicant after: CHINA RAILWAY DESIGN Corp. Applicant after: Zhongyu Tiexin Transportation Technology Co.,Ltd. Address before: No. 201, Ligang building, No. 82, West 2nd Road, Tianjin Binhai New Area pilot free trade zone (Airport Economic Zone) Applicant before: CHINA RAILWAY DESIGN Corp. Applicant before: HENGSHUI ZHONGTIEJIAN ENGNIEERING RUBBER Co.,Ltd. |