CN108505437A - A kind of extrusion item for expansion gap device - Google Patents
A kind of extrusion item for expansion gap device Download PDFInfo
- Publication number
- CN108505437A CN108505437A CN201810497407.8A CN201810497407A CN108505437A CN 108505437 A CN108505437 A CN 108505437A CN 201810497407 A CN201810497407 A CN 201810497407A CN 108505437 A CN108505437 A CN 108505437A
- Authority
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- China
- Prior art keywords
- tie point
- rhombogen
- expansion
- connector
- head
- Prior art date
- 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.)
- Pending
Links
- 238000001125 extrusion Methods 0.000 title claims abstract description 19
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 7
- 239000010432 diamond Substances 0.000 claims abstract description 7
- 229920001971 elastomer Polymers 0.000 abstract description 4
- 238000011049 filling Methods 0.000 abstract description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 17
- 239000000565 sealant Substances 0.000 description 16
- 238000002955 isolation Methods 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 229920002323 Silicone foam Polymers 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000013514 silicone foam Substances 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 239000000203 mixture Substances 0.000 description 8
- 229910052697 platinum Inorganic materials 0.000 description 8
- 239000003431 cross linking reagent Substances 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 239000012153 distilled water Substances 0.000 description 4
- 239000004590 silicone sealant Substances 0.000 description 4
- 235000003283 Pachira macrocarpa Nutrition 0.000 description 3
- 241001083492 Trapa Species 0.000 description 3
- 235000014364 Trapa natans Nutrition 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000009165 saligot Nutrition 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- BVPWJMCABCPUQY-UHFFFAOYSA-N 4-amino-5-chloro-2-methoxy-N-[1-(phenylmethyl)-4-piperidinyl]benzamide Chemical compound COC1=CC(N)=C(Cl)C=C1C(=O)NC1CCN(CC=2C=CC=CC=2)CC1 BVPWJMCABCPUQY-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
- E01D19/067—Flat continuous joints cast in situ
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
A kind of extrusion item for expansion gap device, the item that squeezes out includes that positioned at left and right ends and can be clamped on the expansion-head of expansion joint both sides and the ontology positioned at centre, and the both ends of the ontology are connect by connector respectively with expansion-head；The ontology includes the rhombogen that several are arranged side by side from left to right, and the longitudinal section of the rhombogen is diamond shape, and adjacent two rhombogen is fixedly linked.Extrusion item of the present invention is double-layer rubber closed configuration, can effectively realize the anti-sundries filling of water-impervious at expansion joint between beam body.And the diamond structure for squeezing out item can effectively support top joint filling seal, and along bridge to free dilatation ability.
Description
Technical field
The invention belongs to technical field of civil engineering, and in particular to a kind of extrusion item for expansion gap device, it can
Applied to Urban Bridge, ring road, public affairs (iron) road and bridge beam construction field.
Background technology
Existing bridge expansion joint installation is directly exposed to bridge deck mostly, due to being exposed to air, dust, sundries for a long time
In the environment of clast, vehicle exhaust and acid rain, it is caused gradually to damage and greatly reduce service life.When long by vehicle simultaneously
Between lasting repeated stock effect, the health at expansion joint can also be generated and be seriously affected.
Under the collective effect of above-mentioned factor, expansion joint connector can be destroyed (concrete joint cracking destruction or steel connector
Corrosion and destruction), the bridges metal component such as steel plate destroy, expansion joint deformation displacement dislocation or limited.In the worst cases, these are lacked
It falls into and the accumulation of damage can cause the failure of bridge structure or even collapse.
Invention content
The problem of being easily damaged for existing highway bridge expansion gap device, the present invention provide a kind of squeezing for expansion gap device
Shaping, the present invention seal that water resistance is excellent, telescopicing performance is good in the case of various modifications, it is tight to be connect with concrete and steel plate etc.
Close, constructing operation conveniently, and has renewable function.
The technical solution adopted by the present invention is：
The embodiment of the present application provides a kind of extrusion item for expansion gap device, and the extrusion item includes being located at left and right
Both ends and the expansion-head of expansion joint both sides can be clamped on and positioned at intermediate ontology, and the both ends of the ontology are distinguished with expansion-head
It is connected by connector；
The ontology includes the rhombogen that several are arranged side by side from left to right, and adjacent two rhombogen is fixedly linked, each water chestnut
The shape size all same of body, and the longitudinal section of the rhombogen is diamond shape.
Further, the rhombogen includes end to end four bevel edges, and adjacent two bevel edge joins end to end and shape successively
At the first tie point, the second tie point, third tie point and the 4th tie point, and the first tie point is being located at third tie point just
Top, the second tie point and the 4th tie point are located at the left and right sides of the first tie point；
The connector includes the first connector and the second connector, is located at the first connection of the rhombogen of the leftmost side
Point is connected by first connector in left side with the expansion-head in left side, and the second tie point positioned at the rhombogen of the leftmost side passes through a left side
Second connector of side is connected with the expansion-head in left side, and first connector in left side, second connector in left side and positioned at most
Bevel edge between the first tie point and the second tie point on the rhombogen in left side constitutes a triangular cavity；
The first tie point positioned at the rhombogen of the rightmost side is connected by first connector on right side with the expansion-head on right side,
The 4th tie point positioned at the rhombogen of the rightmost side is connected by the second connector positioned at right side with the expansion-head on right side, and right
First connector of side, second connector on right side and the first tie point on the rhombogen of the rightmost side and the 4th tie point
Between bevel edge constitute another triangular cavity；
Two adjacent rhombogens of left and right are by the 4th tie point of the rhombogen positioned at left side and positioned at the diamond shape on right side
First tie point of body is connected；
Two first connectors are horizontally disposed along bridge length direction.
Further, the rhombogen boring.
Beneficial effects of the present invention are embodied in：
(1) it is double-layer rubber closed configuration to squeeze out item, can effectively realize that the anti-sundries of water-impervious at expansion joint between beam body is filled out
It fills.
(2) top joint filling seal can effectively be supported by squeezing out the diamond structure of item, and along bridge to freedom
Dilatation ability.
Description of the drawings
Fig. 1 is to squeeze out item to apply the schematic diagram on expansion gap device.
Fig. 2 is the structural schematic diagram for squeezing out item.
Specific implementation mode
The technical solution of patent of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work belongs to the model that the present invention protects
It encloses.
In the description of the present invention, it should be noted that such as occur term "center", "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings,
Be merely for convenience of description of the present invention and simplification of the description, do not indicate or imply the indicated device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.In addition, such as there is term "
One ", " second ", " third " are used for description purposes only, and are not understood to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " peace such as occur
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, can also be electrical connection；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, it can understand above-mentioned art with concrete condition
The concrete meaning of language in the present invention.
With reference to attached drawing, the present embodiment provides a kind of extrusion item for expansion gap device, the extrusion item 3 includes being located at a left side
Right both ends and the expansion-head 31 of expansion joint both sides can be clamped on and positioned at intermediate ontology, and the both ends of the ontology and expansion-head
31 are connected by connector respectively；
The ontology includes the rhombogen that several are arranged side by side from left to right, and adjacent two rhombogen is fixedly linked, each water chestnut
The shape size all same of body, and (xoy i.e. in the section of bridge length direction namely Fig. 1 is flat for the longitudinal section of the rhombogen
Face) it is diamond shape.
The rhombogen includes end to end four bevel edges 34,35,36,37, and adjacent two bevel edge 34,35,36,37 is first
Tail is connected and sequentially forms the first tie point a, the second tie point b, third tie point c and the 4th tie point d, and the first tie point
A is located at the surface of third tie point c, and the second tie point b and the 4th tie point d are located at the left and right two of the first tie point a
Side；
The connector includes the first connector 32 and the second connector 33, is located at the first of the rhombogen of the leftmost side
Tie point a is connected by first connector 32 in left side with the expansion-head 31 in left side, and be located at the rhombogen of the leftmost side second connects
Contact b is connected by second connector 33 in left side with the expansion-head 31 in left side, and first connector 32 in left side, left side
Bevel edge 35 between two connectors 33 and the first tie point a and the second tie point b on the rhombogen of the leftmost side constitutes one
A triangular cavity；
The expansion-head for passing through first connector 32 and right side on right side positioned at the first tie point a of the rhombogen of the rightmost side
31 are connected, and the 4th tie point d for being located at the rhombogen of the rightmost side passes through the expansion of the second connector 33 and right side positioned at right side
First 31 be connected, and first connector 32 on right side, second connector 33 on right side and on the rhombogen of the rightmost side first
Bevel edge 34 between tie point a and the 4th tie point d constitutes another triangular cavity；
Two adjacent rhombogens of left and right are by the 4th tie point d of the rhombogen positioned at left side and positioned at the water chestnut on right side
First tie point a of body is connected.
Two first connectors 32 are horizontally disposed along bridge length direction, and the upper table of first connector 32 towards
Isolation board 2 described in upper support, and the isolation board 2 is pushed against on the abutting position on the groove inner top surface.
The rhombogen boring.
The extrusion item of the present embodiment is applied in bridge expanssion joint, a kind of bridge expansion joints without seals device is built, it is described
A kind of bridge expansion joints without seals device includes a pair of of shaped steel 4, and the pair of shaped steel 4 is arranged to mirror image each other along bridge length direction
Between two beam slabs, and shaped steel 4 is fixed on beam slab, and expansion joint is constituted along the gap of bridge length direction between two shaped steel 4, shaped steel 4
Inside is equipped with groove of the opening towards the expansion joint；The sealing expansion joint is fixed in the expansion joint and can be with described
The stuff up a crack portion of expansion joint deformation；It defines and is along bridge length direction (i.e. the direction of expansion joint deformation, that is to say the x-axis direction in Fig. 1)
Left and right directions is upper and lower directions along the high direction of bridge (i.e. the depth direction at expansion joint, that is, the y-axis direction in Fig. 1)；
The stuff up a crack portion includes the supporting layer of the sealant 1 and lower section of top；
The supporting layer includes that several being arranged at intervals in expansion joint along bridge wide direction squeeze out items 3, and the extrusion
Item 3 is suspended in the expansion joint, and the left and right ends for squeezing out item 3 are embedded respectively in the groove of two shaped steel 4；The extrusion
It is equipped with flexible isolation board 2 on the top surface of item 3, and squeezes out item 3 and is pushed against the left and right ends of the isolation board 2 upwards
In the groove；
The top surface of the isolation board 2 and the expansion joint inner wall of both sides form the pouring slot for accommodating the sealant 1, and
The sealant 1 seals the pouring slot.
The opening of the groove is angle, and the top surface of the opening is longer than the bottom surface of the opening；Surpass on the top surface
The inner surface for going out the bottom surface forms the abutting position of isolation board 2.
Wherein, the extrusion item 4 is flexible rubber strip, and the isolation board 2 is the treasure for itself having certain elasticity
Pearl cotton plate, isolation board 2 can completely cut off the sealant 1.
Wherein, the fluffy distending, and the body of the expansion-head 31 in a free state in a free state of the expansion-head 31
Volume of the product more than the groove.It being filled in groove after 31 crimp of expansion-head, then expansion-head 31 is clamped in groove, from
And fix the extrusion item 3.
Wherein, two first connectors 32 are horizontally disposed along bridge length direction, and first connector 32 is upper
Isolation board 2 described in the upward support in surface, and the isolation board 2 is pushed against on the abutting position on the groove inner top surface.
The isolation board 2 spreads along bridge length direction water and is laid with.
The sealant 1 is to be poured to be filled in pour in slot by silicone foam sealant to be formed.
Wherein, the silicone foam sealant by the white component of silicone sealant, silicone sealant ash component, crosslinking agent,
Water and platinum catalyst composition, and：
The crosslinking agent is Baysilone U430 crosslinking agents.The platinum catalyst is C24H54O3Pt2Si5, wherein activity
The mass loading amount of ingredient platinum is 2.0~2.2%.White group of the silicone sealant is divided intoSiliconeSeal
White components, the silicone sealant ash group are divided intoSiliconeSeal gray components, and
It is describedSiliconeSeal white components and describedSiliconeSeal gray
Components is purchased from water Sen Boman Amy that companies (WATSON BOWMAN ACME CORP).The crosslinking agent is
Baysilone U430crosslinker (Baysilone is temporarily without unified translator of Chinese)；The platinum catalyst is Pt-
divinyltetramethyl-disiloxane complex GelestInc.The water is distilled water.
The present invention is a kind of bridges and culverts telescopic device adapting to a variety of addendum modifications, can be widely used for various telescopic displacement magnitudes,
During the city of various across footpaths, public affairs (iron) road and bridge are contained.
The present invention is not required to slot again, is realized by filling at the top of gap of stretching between beam body.
Before construction, must polish to existing pre-buried shaped steel 4 coarse processing, to realize silicone foam mixture with shaped steel 4 more
It is good to bond.
Steps are as follows for the Specific construction of the present embodiment：
A, the sundries in expansion joint is cleared up and takes out original rubber strip in expansion joint, later to 4 inside of shaped steel
Faying face carries out coarse processing of polishing, so that silicone foam mixture is more preferably bonded with shaped steel.
B, installation squeezes out item 3, and the dimensioning for squeezing out item 3 is determined according to the extendable room size at expansion joint and expansion joint type
It is very little to produce required extrusion item 3, then the both ends for squeezing out item 3 are embedded in groove.
C, isolation board 2 is installed, select the isolation board 2 of suitable thickness to be laid on and squeeze out on item 3, blend compounds water cements isolation board
2 with squeeze out item 3.
D, silicone foam sealant is configured：
D1, prepare following engineering material：
A. chemicals：WABO white, WABO black, crosslinking agent, water and platinum catalyst measure given known in advance
The volume of silicone foam sealant needed for the expansion joint of size, and prepare according to table 1.
1. silicone foam sealant compositions of table
B. utensil：It is respectively used to the syringe of storage crosslinking agent, distilled water, platinum catalyst；
Adjust the adjustment tool (such as cutting tool) of pad size；
The smooth tool (such as scraper plate) of silicone foam sealant is flattened in certain depth；
Plastic stir container；
Battery power bores；
Electric drill additional blender；
Spatula；
Ice cooling device.
D2, because cryogenic conditions reaction speed it is slack-off, when silicone foam sealant it is each mixing chemically react when, whenever
Temperature reduces by 10 DEG C of then chemical reaction rate reduction half, then first each component is respectively charged into ice cooling device and is independently stored.
D4, at the scene will squeeze out item 3 and be put into expansion joint, using adjustment tool will squeeze out item 3 be pressed under bridge floor it is special
Depthkeeping degree.
D5, WABO white, WABO black, distilled water and platinum catalyst are poured into plastic stir container, uses electricity
Above-mentioned four kinds of components are sufficiently stirred by pond power drill and electric drill additional blender.
D6, when water has been evenly dispersed in entire mixture, (WABO white, WABO black, distilled water and platinum are urged
Agent mixture) in when, crosslinking agent is added, and is disposably mixed to form mixture with other components.
D7, silicone foam sealant is poured into the pouring slot at expansion joint.
D8, it is to ensure that silicone foam sealant is in appropriate depth before starting foaming, another personnel is needed to follow
After the personnel for toppling over silicone foam sealant, silicone foam sealant is flattened to suitable depth with smooth tool and spatula
Degree.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention
Range is not construed as being only limitted to the concrete form of embodiment statement, and protection scope of the present invention is also and in people in the art
Member according to present inventive concept it is conceivable that equivalent technologies mean.
Claims (3)
1. a kind of extrusion item for expansion gap device, it is characterised in that：The extrusion item includes that positioned at left and right ends and can block
Tightly in the expansion-head of expansion joint both sides and positioned at intermediate ontology, and the both ends of the ontology pass through connector respectively with expansion-head
Connection；
The ontology includes the rhombogen that several are arranged side by side from left to right, and adjacent two rhombogen is fixedly linked, each rhombogen
Shape size all same, and the longitudinal section of the rhombogen be diamond shape.
2. a kind of extrusion item for expansion gap device as described in claim 1, it is characterised in that：The rhombogen includes head
Four connected bevel edges of tail, and adjacent two bevel edge joins end to end and sequentially forms the first tie point, the second tie point, third connection
Point and the 4th tie point, and the first tie point is located at the surface of third tie point, the second tie point and the 4th tie point difference
Positioned at the left and right sides of the first tie point；
The connector includes the first connector and the second connector, and the first tie point for being located at the rhombogen of the leftmost side is logical
The first connector for crossing left side is connected with the expansion-head in left side, and the second tie point for being located at the rhombogen of the leftmost side passes through left side
Second connector is connected with the expansion-head in left side, and first connector in left side, second connector in left side and be located at the leftmost side
Rhombogen on the first tie point and the second tie point between bevel edge constitute a triangular cavity；
The first tie point positioned at the rhombogen of the rightmost side is connected by first connector on right side with the expansion-head on right side, is located at
4th tie point of the rhombogen of the rightmost side is connected by the second connector positioned at right side with the expansion-head on right side, and right side
Between first connector, second connector on right side and the first tie point and the 4th tie point on the rhombogen of the rightmost side
Bevel edge constitute another triangular cavity；
Adjacent fourth tie point of two rhombogens by the rhombogen positioned at left side in left and right and the rhombogen positioned at right side
First tie point is connected；
Two first connectors are horizontally disposed along bridge length direction.
3. a kind of extrusion item for expansion gap device as claimed in claim 2, it is characterised in that：It is empty inside the rhombogen
The heart.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810497407.8A CN108505437A (en) | 2018-05-22 | 2018-05-22 | A kind of extrusion item for expansion gap device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810497407.8A CN108505437A (en) | 2018-05-22 | 2018-05-22 | A kind of extrusion item for expansion gap device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108505437A true CN108505437A (en) | 2018-09-07 |
Family
ID=63401326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810497407.8A Pending CN108505437A (en) | 2018-05-22 | 2018-05-22 | A kind of extrusion item for expansion gap device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108505437A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109235255A (en) * | 2018-09-12 | 2019-01-18 | 安徽尚德科技有限公司 | A kind of two-chamber squash type quick-replaceable type is without contamination water-tight device |
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| CN106758797A (en) * | 2016-12-17 | 2017-05-31 | 浙江工业大学 | Bridge type steel expansion joint serves as a contrast bar with filleting |
| US20170328016A1 (en) * | 2016-05-16 | 2017-11-16 | LTBB Marketing, LLC | Expansion joint seals and methods for manufacturing the same |
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2018
- 2018-05-22 CN CN201810497407.8A patent/CN108505437A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH586790A5 (en) * | 1974-07-11 | 1977-04-15 | Kober Ag | Corrugated flexible gap joint seal for roads - has domed reinforcing flexible band on underside joined to corrugations |
| US4685825A (en) * | 1984-05-09 | 1987-08-11 | Friedrick Maurer Sohne Gmbh & Co. Kg | Device for use in expansion joints |
| CA1280021C (en) * | 1986-07-02 | 1991-02-12 | Alfred Hartkorn | Joint bridging construction for structures |
| US5575126A (en) * | 1993-12-28 | 1996-11-19 | Mm Systems Corp. | Flat expansion joint gasket |
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