CN109930481A - A kind of Prefabricated integral resin concrete telescopic device and its construction method - Google Patents
A kind of Prefabricated integral resin concrete telescopic device and its construction method Download PDFInfo
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- CN109930481A CN109930481A CN201910339650.1A CN201910339650A CN109930481A CN 109930481 A CN109930481 A CN 109930481A CN 201910339650 A CN201910339650 A CN 201910339650A CN 109930481 A CN109930481 A CN 109930481A
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- resin concrete
- telescopic device
- unit
- expansion joint
- fashioned iron
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- 239000011347 resin Substances 0.000 title claims abstract description 72
- 229920005989 resin Polymers 0.000 title claims abstract description 72
- 238000010276 construction Methods 0.000 title claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 94
- 229910052742 iron Inorganic materials 0.000 claims abstract description 43
- 238000009434 installation Methods 0.000 claims abstract description 15
- 239000002390 adhesive tape Substances 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 239000012190 activator Substances 0.000 claims description 6
- 210000003205 muscle Anatomy 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 5
- 239000000565 sealant Substances 0.000 claims description 4
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 35
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The present invention discloses a kind of Prefabricated integral resin concrete telescopic device, including first unit, second unit and waterproof adhesive tape, and first unit is identical as the structure of second unit；First unit includes expansion joint fashioned iron and resin concrete seat, two layers is welded on the fashioned iron of expansion joint mutually in the anchor rib of default angle, expansion joint fashioned iron and two layers of anchor rib are formed on resin concrete seat in advance；Expansion joint fashioned iron in first unit is connected with the expansion joint fashioned iron on second unit by waterproof adhesive tape.Structure of the invention is small, and buried depth is shallow, and the telescopic device structure size is small, installation notch are shallow, and without reserving installation notch on beam body presetting preburied part and carrier beam body, installation usually can be realized in the Surface pavement layer of bridge, girder construction is not destroyed, disjunctor design is not influenced, especially suitable for thin-walled beam body.
Description
Technical field
The invention belongs to Highway bridge technique fields, and in particular to a kind of Prefabricated integral resin concrete telescopic device and
Its construction method.
Background technique
Expansion Units for Highway Bridges is the component that last procedure in bridge construction is installed, directly receiving automobile
The repeated action of wheel load especially will receive very big percussion in bridge floor out-of-flatness.Simultaneously because it is long-term sudden and violent
Dew in an atmosphere, use environment is more severe, and durability is poor, thus Expansion Units for Highway Bridges be in bridge structure most vulnerable to
To the component of destruction and more difficult repairing.Expansion gap device is because of material therefor performance issue, structure is unreasonable, construction quality control
Make the reasons such as not tight and mounting process precision is not high are generally relatively early to be destroyed.
During bridge operation, on the one hand, the amount of deflection due to caused by concrete shrinkage and creep, various loads, basis are uneven
There is early damage, the deformation of seam body and cast-in-place coagulation in the influence of the factors such as sedimentation, deck profile grade and brake power, telescopic device
The diseases such as native surface localized delamination are especially common；On the other hand, with the growth in bridge age, due to natural causes such as environment, weathers
Effect, the increasingly increased volume of traffic and loaded vehicle, overweight vehicle gap bridge quantity the factors such as be continuously increased, but also telescopic device is sent out
The raw probability destroyed is bigger than normal.
Bridge extension joint once damages, and so that passenger felt uncomfortable, lacked the sense of security, but also due to it
Impact of the vehicle to superstructure caused by damaging also affects bridge main body structure while deteriorating driving conditions
Stress reduces bridge service life, causes different degrees of economic loss and adverse effect, or even can jeopardize bridge security.?
In existing highway bridge expanssion joint replacement process, two key links taken a long time are construction and the expansion joint of reserved notch
Concrete pouring and conserving, especially concreting and maintenance the holding time longest in entire replacement process.
Summary of the invention
To solve problems of the prior art, the purpose of the present invention is to provide a kind of Prefabricated integral resin coagulations
Native telescopic device and its construction method, to solve the problems, such as telescopic device maintenance replacement long construction period.
To reach realization above-mentioned purpose, the present invention adopts the following technical scheme:
A kind of Prefabricated integral resin concrete telescopic device, including first unit, second unit and waterproof adhesive tape, the
Unit one is identical as the structure of second unit；
First unit includes expansion joint fashioned iron and resin concrete seat, and two layers is welded on the fashioned iron of expansion joint mutually in default folder
The anchor rib at angle, expansion joint fashioned iron and two layers of anchor rib are formed on resin concrete seat in advance；
Expansion joint fashioned iron in first unit is connected with the expansion joint fashioned iron on second unit by waterproof adhesive tape.
The shape of resin concrete seat is cuboid, and expansion joint fashioned iron is set to one jiao of resin concrete seat, expansion joint
The side adjacent with resin concrete seat coach row face is concordant with the garage face of resin concrete seat on fashioned iron；The garage face is pre-
Monoblock type resin concrete telescopic device processed when in use, is used for the surface of driving on resin concrete seat.
In two layers of anchor rib, wherein one layer of anchor rib is parallel with resin concrete seat coach row face, another layer of anchor rib inclines far
It is tilted from resin concrete seat coach row face side.
In two layers of anchor rib, the pad of one layer of anchor rib and expansion joint fashioned iron and another layer of anchor rib and expansion joint fashioned iron
Pad mutually stagger.
In two layers of anchor rib, wherein one layer of anchor rib uses plain bar, another layer of anchor rib uses Ribbed Bar.
Every layer of anchor rib includes several anchor ribs being arranged successively, and the shape of each anchor rib is arc-shaped.
Expansion joint fashioned iron uses C-type steel.
Waterproof adhesive tape is connect with the opening of expansion joint fashioned iron.
The construction method of above-mentioned Prefabricated integral resin concrete telescopic device, comprising the following steps:
S1 sets out mounting groove on the bridge deck pavement at bridge expanssion joint, and mounting groove is surface-treated completely；
S2 uniformly brushes one layer of activator in the bottom of mounting groove and side；
First unit and second unit are separately mounted in the corresponding mounting groove in two sides at bridge expanssion joint by S3, and root
According to road level ruler adjustment first unit and second unit point, meet code requirement；
S4, the gap cleared up between telescopic device type chamber and telescopic device and mounting groove are simultaneously inlayed sealant tape, are completed
The installation of Prefabricated integral resin concrete telescopic device.
Compared to the prior art, the present invention has the following technical effect that
Expansion joint fashioned iron and anchor rib are formed on resin in advance and mixed by Prefabricated integral resin concrete telescopic device of the invention
In solidifying soil seat, an integral unit is formed, mounting groove can be directly opened up at joint of bridge in construction and pacify integral unit
In mounting groove, the type chamber at expansion joint inlays sealant tape, realizes final installation；By being welded on the fashioned iron of expansion joint
Two layers is in mutually the anchor rib for presetting angle, not only ensure that the effect of anchoring, but also can reduce the size of whole device, so that
The structure size of Prefabricated integral resin concrete telescopic device of the present invention is small, and installation notch are shallow, usually spreads on the surface of bridge
Installation can be realized in dress layer, does not destroy girder construction.Therefore Prefabricated integral resin concrete telescopic device of the invention is being pacified
Without reserving installation notch on beam body presetting preburied part and carrier beam body when dress, installation overall process is not necessarily to any welding procedure, energy
Enough on-site construction time is greatly shortened, it can be achieved that being quickly open to traffic.The present invention does not influence disjunctor design, especially suitable for thin walled beam
Body.Secondly, using resin concrete seat so that Prefabricated integral resin concrete telescopic device anti-fatigue performance of the invention compared with
It is good, it is applicable to high temperature area, long service life.
The construction method of Prefabricated integral resin concrete telescopic device construction of the present invention is when carrying out, in bridge expanssion joint
Mounting groove is set out on the bridge deck pavement at place, and mounting groove is surface-treated completely；It is uniformly applied in the bottom of mounting groove and side
Brush one layer of activator；First unit and second unit are separately mounted in the corresponding mounting groove in two sides at bridge expanssion joint, and
According to road level ruler adjustment first unit and second unit point, meet code requirement；It clears up the type chamber at expansion joint and inlays close
Sealed adhesive tape completes the installation of Prefabricated integral resin concrete telescopic device.From the above, it is seen that Prefabricated integral of the present invention
The construction method process of resin concrete telescopic device is few, time-consuming short, using gluing, therefore curing time section, it can be realized fast
Speed is open to traffic；And it only needs to destroy when replacing telescopic device or the telescopic device of failure is removed out of mounting groove, to installation
Slot directly reinstalls new telescopic device after carrying out surface treatment, therefore installation and replacement time time-consuming is shorter, energy
It enough realizes the rapid-maintenance of bridge extension joint and replacement is constructed and open to traffic, mitigate traffic and protect smooth pressure, build good
Transportation enviromnent.
Detailed description of the invention
Fig. 1 is the positive structure diagram of Prefabricated integral resin concrete telescopic device of the present invention.
Fig. 2 is the overlooking structure diagram of Prefabricated integral resin concrete telescopic device of the present invention.
Wherein: 1- standard groove width, 2- telescopic device displacement, 3- standard fluting thickness, 4- screed-coat, the first anchor of 5-
Gu muscle, 6- waterproof adhesive tape, the expansion joint 7- fashioned iron, the second anchor rib of 8-, 9- bridge deck pavement, 10- beam body, 11- resin concrete
Seat.
Specific embodiment
Specific embodiments of the present invention are given below, it should be noted that the invention is not limited to implement in detail below
Example, all equivalent transformations made on the basis of the technical solutions of the present application each fall within protection scope of the present invention.
In compliance with the above technical solution, as shown in Figure 1 to Figure 2, the present embodiment provides a kind of Prefabricated integral resin concrete
Telescopic device, suitable for Short/Medium Span Bridge expansion joint.Prefabricated integral resin concrete telescopic device of the invention, including
First unit, second unit and waterproof adhesive tape 6, first unit are identical as the structure of second unit；First unit includes flexible
Fashioned iron 7 and resin concrete seat 11 are stitched, two layers is welded on expansion joint fashioned iron 7 mutually in the anchor rib of default angle, expansion joint type
Steel 7 and two layers of anchor rib are formed on resin concrete seat 11 in advance；On expansion joint fashioned iron 7 and second unit in first unit
Expansion joint fashioned iron 7 connected by waterproof adhesive tape 6.Wherein, the shape of resin concrete seat 11 is cuboid, expansion joint fashioned iron 7
It is set to one jiao of resin concrete seat 11, the side and tree adjacent with 11 garage face of resin concrete seat on expansion joint fashioned iron 7
The garage face of rouge concrete pad 11 is concordant；When in use for Prefabricated integral resin concrete telescopic device, resin is mixed in garage face
Surface (i.e. the upper surface of resin concrete seat 11 in Fig. 1) on solidifying soil seat 11 for driving.In two layers of anchor rib, wherein one layer
Anchor rib is parallel with 11 garage face of resin concrete seat, this layer of anchor rib uses Ribbed Bar；Another layer of anchor rib is to far from tree
The inclination of 11 garage, side, face of rouge concrete pad, this layer of anchor rib use plain bar.In two layers of anchor rib, one layer of anchor rib with stretch
The pad of the pad and another layer of anchor rib and expansion joint fashioned iron 7 of contracting seam fashioned iron 7 mutually staggers.As shown in Fig. 2, every layer of anchor
Gu muscle includes several anchor ribs being arranged successively, the shape of each anchor rib is arc-shaped.As shown in Figure 1, expansion joint fashioned iron 7 is adopted
With C-type steel, waterproof adhesive tape 6 is connect with the opening of expansion joint fashioned iron 7.
Prefabricated integral resin concrete telescopic device of the invention is a kind of telescopic device for Short/Medium Span Bridge,
In bridge head or divide fluting at connection, groove width and depth are determined by bridge stroke and telescopic device specification, of the invention
Telescopic device is respectively suitable for the bridge that telescopic device displacement amount is 35mm, 50mm, 80mm and 100mm there are four types of specification.This
When invention telescopic device is prefabricated, C-type steel is cut into suitable length as desired, C-type steel side weld two layers it is semicircular
Anchor rib, Ribbed Bar paperbacked welding, plain bar form an angle with Ribbed Bar shape.Steel template has been found in factory,
Template inner side brush coating release agent fixes C-type steel with leveling lugs and leveling block, resin concrete is stirred evenly and laminated pouring
Enter expansion joint notch, first layer is 3/4ths of expansion joint notch, substantially covers anchor rib.Ordinary circumstance, once-cast
Notch length 7-8m；The key of casting resin concrete is: ensuring the good mobility of resin concrete and compactness, no
Cavity must be formed, resin concrete is closely knit to be must assure that fashioned iron bottom.The casting when first layer is poured, and takes advantage of still toughness
The second layer, that is, superficial layer.The casting of surface layer is even more important, it is necessary to ensure that smoothly and with C-type steel upper surface (stretches shown in Fig. 1
Stitch the one side of fashioned iron upward) it is concordant.After resin concrete is poured and meets the requirements, it need to conserve 2-3 hours, work as environment temperature
It need to be covered with Tarpauling when raining lower than 5 DEG C or at this time, Shi Ketong hot-air of having ready conditions maintenance.
The construction method of Prefabricated integral resin concrete telescopic device of the invention, comprising the following steps:
(1) it when above-mentioned Prefabricated integral resin concrete telescopic device is installed, need to be drawn according to the split groove width of drawing size
Line, it is necessary to ensure that saw kerf quality.With pneumatic pick breaking tank hole in pitch, until 10 top of beam body screed-coat 4, screed-coat 10
Bottom surface of the upper surface as mounting groove, when fluting, must not influence to damage expansion joint notch, obtain up-to-standard mounting groove；Fluting
Grooving waste is cleared up afterwards and is cleared up or is cheated with electronic grinding cleaning slot, the concrete residue for removing residual and loosening with steel brush, and
Dust is blown off with compressed air；
(2) one layer of activator is equably brushed into the installation trench bottom cleared up and side.Pay special attention to brushing activator
When only enable install groove bottom and side it is uniform and very thin paint one layer, blocked up must not must not also brush leakage.Resin concrete seat
The upper face contacted with mounting groove also needs to brush one layer of activator；
(3) while clearing up notch, telescopic device is fixed with leveling lugs and leveling block, and do not do in two side bonds of notch
Glue；The fixed telescopic device of leveling is placed in mounting groove, and according to the further adjustment of road level ruler.It is general to require, it stretches
Bracing wire method is used to guarantee that telescopic device is straight simultaneously lower than road surface 0-2mm in contracting seam fashioned iron surface；
(4) in order to improve work efficiency, accelerate installation speed, after fixing telescopic device with leveling lugs and leveling block, check flexible
The straightness on device garage face and road surface, telescopic device gap and telescopic device straightness, it is ensured that meet code requirement, to be placed into
Leveling lugs and leveling fixed block are discharged after telescopic device again；
(5) sundries and dirt between telescopic device type chamber and telescopic device and mounting groove in gap are blown off with compressed air
Soil；Inlay sealant tape, place cleaning, open to traffic.
The present invention makes innovation in expansion joint anchorage zone concrete and fashioned iron device, use instead concrete resin type material and
Its corresponding expansion gap device, mating Prefabricated integral resin concrete telescopic device realize bridge extension joint seam quickly dimension
It repairs and protects smooth pressure with replacement construction and open to traffic, mitigation traffic, build good transportation enviromnent.
Claims (9)
1. a kind of Prefabricated integral resin concrete telescopic device, which is characterized in that including first unit, second unit and prevent
Glue item (6), first unit are identical as the structure of second unit；
First unit includes expansion joint fashioned iron (7) and resin concrete seat (11), and being welded with two layers on expansion joint fashioned iron (7) is mutually in
The anchor rib of default angle, expansion joint fashioned iron (7) and two layers of anchor rib are formed in advance on resin concrete seat (11)；
Expansion joint fashioned iron (7) in first unit and the expansion joint fashioned iron (7) on second unit are connected by waterproof adhesive tape (6).
2. a kind of Prefabricated integral resin concrete telescopic device according to claim 1, which is characterized in that resin coagulation
The shape of native seat (11) is cuboid, and expansion joint fashioned iron (7) is set to one jiao of resin concrete seat (11), expansion joint fashioned iron
(7) side adjacent with resin concrete seat (11) garage face is concordant with the garage face of resin concrete seat (11) on.
3. a kind of Prefabricated integral resin concrete telescopic device according to claim 2, which is characterized in that two layers of anchoring
In muscle, wherein one layer of anchor rib is parallel with resin concrete seat (11) garage face, another layer of anchor rib is to far from resin concrete
The inclination of seat (11) garage, side, face.
4. a kind of Prefabricated integral resin concrete telescopic device according to claim 1, which is characterized in that two layers of anchoring
In muscle, one layer of anchor rib and the pad of expansion joint fashioned iron (7) and the pad phase of another layer of anchor rib and expansion joint fashioned iron (7)
Mutually it is staggered.
5. a kind of Prefabricated integral resin concrete telescopic device according to claim 1, which is characterized in that two layers of anchoring
In muscle, wherein one layer of anchor rib uses plain bar, another layer of anchor rib uses Ribbed Bar.
6. a kind of Prefabricated integral resin concrete telescopic device according to claim 1, which is characterized in that every layer of anchoring
Muscle includes several anchor ribs being arranged successively, and the shape of each anchor rib is arc-shaped.
7. a kind of Prefabricated integral resin concrete telescopic device according to claim 1, which is characterized in that expansion joint type
Steel (7) uses C-type steel.
8. a kind of Prefabricated integral resin concrete telescopic device according to claim 1, which is characterized in that waterproof adhesive tape
(6) it is connect with the opening of expansion joint fashioned iron (7).
9. the construction method of Prefabricated integral resin concrete telescopic device, feature described in claim 1-8 any one
It is, comprising the following steps:
S1 sets out mounting groove on the bridge deck pavement (9) at bridge expanssion joint, and mounting groove is surface-treated clean；
S2 uniformly brushes one layer of activator in the bottom of mounting groove and side；
First unit and second unit are separately mounted in the corresponding mounting groove in two sides at bridge expanssion joint by S3, and according to road
Face horizontal ruler adjustment first unit and second unit point, meet code requirement；
S4, the gap cleared up between telescopic device type chamber and telescopic device and mounting groove are simultaneously inlayed sealant tape, are completed prefabricated
The installation of monoblock type resin concrete telescopic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910339650.1A CN109930481A (en) | 2019-04-25 | 2019-04-25 | A kind of Prefabricated integral resin concrete telescopic device and its construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910339650.1A CN109930481A (en) | 2019-04-25 | 2019-04-25 | A kind of Prefabricated integral resin concrete telescopic device and its construction method |
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| Publication Number | Publication Date |
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| CN109930481A true CN109930481A (en) | 2019-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910339650.1A Pending CN109930481A (en) | 2019-04-25 | 2019-04-25 | A kind of Prefabricated integral resin concrete telescopic device and its construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184907A (en) * | 2019-06-27 | 2019-08-30 | 李永君 | A kind of steel reinforced concrete combined road-bridge retractor device |
| CN110184908A (en) * | 2019-06-27 | 2019-08-30 | 李永君 | A kind of dedicated extensible member of composite beam bridge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892631A (en) * | 2010-07-30 | 2010-11-24 | 杭州科博桥梁加固养护有限公司 | Bridge expansion joint structure and construction technology thereof |
| CN203174500U (en) * | 2013-04-25 | 2013-09-04 | 毛勒桥梁附件有限公司 | Epoxy resin single slit type extensible device |
| CN104018425A (en) * | 2014-06-24 | 2014-09-03 | 宁波路宝科技实业集团有限公司 | Quickly replaceable bridge expansion joint device and mounting method thereof |
| CN210086042U (en) * | 2019-04-25 | 2020-02-18 | 长安大学 | Prefabricated integral resin concrete telescoping device |
-
2019
- 2019-04-25 CN CN201910339650.1A patent/CN109930481A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892631A (en) * | 2010-07-30 | 2010-11-24 | 杭州科博桥梁加固养护有限公司 | Bridge expansion joint structure and construction technology thereof |
| CN203174500U (en) * | 2013-04-25 | 2013-09-04 | 毛勒桥梁附件有限公司 | Epoxy resin single slit type extensible device |
| CN104018425A (en) * | 2014-06-24 | 2014-09-03 | 宁波路宝科技实业集团有限公司 | Quickly replaceable bridge expansion joint device and mounting method thereof |
| CN210086042U (en) * | 2019-04-25 | 2020-02-18 | 长安大学 | Prefabricated integral resin concrete telescoping device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184907A (en) * | 2019-06-27 | 2019-08-30 | 李永君 | A kind of steel reinforced concrete combined road-bridge retractor device |
| CN110184908A (en) * | 2019-06-27 | 2019-08-30 | 李永君 | A kind of dedicated extensible member of composite beam bridge |
| CN110184907B (en) * | 2019-06-27 | 2021-07-13 | 李永君 | Steel-concrete combined bridge expansion device |
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