AU756564B2 - Precast floor slab composed of a steel plate and concrete joint structure thereof - Google Patents
Precast floor slab composed of a steel plate and concrete joint structure thereof Download PDFInfo
- Publication number
- AU756564B2 AU756564B2 AU80833/98A AU8083398A AU756564B2 AU 756564 B2 AU756564 B2 AU 756564B2 AU 80833/98 A AU80833/98 A AU 80833/98A AU 8083398 A AU8083398 A AU 8083398A AU 756564 B2 AU756564 B2 AU 756564B2
- Authority
- AU
- Australia
- Prior art keywords
- concrete
- floor slab
- bolt holes
- steel plate
- bolts
- 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.)
- Ceased
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/04—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Description
1.
A
Our Ref. SHOB05 P/00/001I1 Regulation 3.2
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT Applicant: Applicant and address: Sho-Bond Corporation 3-18 Kandanishikicho, Chiyoda-ku Tokyo Japan A UMIT C tVJ 13LV ATTr11PT) Address For Service: Pattl R. Tayler Asse ats PO Bex744- Precast floor slab composed of a steel plate and concrete joint structure thereof Shigeji Onsen Akihito Mori Toshitaka Hikimnura L. 0 Invention Title: Inventors: original application no. 58368/96 The following statement is a full description of this invention, including the best method of performing it known to me: 3504.doc 1 Floor Slab Assembly The present invention relates to a floor slab assembly using precast floor slabs made of steel plate and concrete.
Bridge floor slabs include a cast-in-place slab for which from assembling, reinforcing and concrete placing processes are conducted in the field, and a precast floor slab in which such processes are carried out in advance in the shop and then brought into the field.
***Conventionally, as shown in Fig. 7, a precast floor slab composed of a steel plate and concrete is prepared by welding shear connectors 13 of stud type, pipe 10 type and the like at predetermined intervals on a concrete placing portion 12a of a steel plate 12 of predetermined size comprising the concrete placing portion and a joint portion, and then placing concrete on the concrete placing portion 12a. Two panels are connected by opposingly facing the joint portions 12b, welding an attaching plate 14 on an undersurface of the joint portions 12b and then placing concrete thereon so as to keep continuity of the steel plate 12. In Fig. 7, there is shown a situation where concrete is not placed on the joint portions, numerals 17 and 18 designating reinforcing bars.
PAWPDOCS\DYS\spfre\7610391 spe.dwcc.4 Nmmb 2002 -2- Operation of welding considerably depends on welder's skill and is easily influenced by operating environment including wind and ambient temperature around the site in the case of field welding. Such disadvantages make deck welding less reliable.
Further, distortion (internal stress) and change in hardness derived from welding would decrease the resistance to fatigue of decks.
On the other hand, structural continuity of jointed decks is weakened because of difference between structure of main body and that of joint portions.
According to one aspect of the present invention there is provided a floor slab 10 assembly comprising first and second precast floor slabs each comprising: S: a steel plate including a concrete later receiving portion and an edge portion, the concrete layer having bolt holes therein arranged at predetermined intervals; high-strength bolts inserted in the bolt holes and fitted with nuts to form shear connectors; and a concrete layer above the steel plate and into which the bolts project: the edge portions of the steel plates of the floor slabs having bolt holes therein and being arranged side by side with a splice plate which has further bolt holes therein being attached to the undersurfaces of the edge portions of the steel plates by high-strength bolts S"which are inserted through the bolt holes in the splice plate and the edge portions, and 20 fitted with nuts to form shear connectors, the bolts projecting into a concrete infill strip *oooo 0 between the concrete layers of the floor slabs.
As the high-strength bolts are friction-jointed, each bolt functions as a reliable shear connector structure of the floor slab without decreasing the resistance to fatigue which has been inevitable with conventionally welded shear connectors because of distortion and change in hardness thereof. Also, fabrication of the floor slab assembly is not reliant on a welder's skill and it is possible to avoid conventional problems arising from field welding conditions such as wind, ambient temperature, etc. as well as other inconveniences which accompany welding.
Because the structures of the concrete layers and the concrete infill strip are about PA\WPDOCS\DYSVrp~ic\7610391 spcd-c-14 Novmb 2002 -3the same, this improves the continuity of the structure as a whole and, because of the common shear connector structure, improves the reliability.
A non-limiting embodiment of a floor slab assembly in accordance with the present invention will now be described with reference to the accompanying drawings, in which:- 0 4 Fig. 1 is a section taken on line A-A in Fig. 2, showing a precast floor slab of the floor slab assembly; Fig. 2 is a plan view of the precast floor slab; Fig. 3 is a section taken on line B-B in Fig. 4, showing the floor slab assembly; Fig. 4 is a plan view of the floor slab assembly; Fig. 5 is a section showing how to fix a high-strength bolt; Fig. 6 is a section of an another example of how to fix a high-strength bolt; and Fig. 7 is a section of an conventional floor slab assembly.
In Fig. 1, only outlines of placed concrete are drawn and inside thereof is shown, for convenience, as if the concrete is not placed. An embodiment of a precast floor slab 1 is shown in Figs. 1 and 2. A steel plate 2 is consisted of a concrete placing portion 2a and a jointing portion 2b and may arbitrary size decided by considering conditions of a bridge where floor slabs thereon are replaced and effective conveyance of the panel.
Bolt holes 9 for high-strength bolts 3 are formed on the steel plate at predetermined intervals. In Fig. 2, the high-strength bolt holes 9 formed on the concrete placing portion 2a are invisible because the high-strength bolts 3 are inserted therein. Distances of the high-strength bolt holes 9 are different between the concrete placing portion 2a and the joint portion 2b in Fig. 2.
The high-strength bolt 3 is fitted with a washer 6a and a nut 5a at a downward portion thereof and inserted from upside of the concrete placing portion 2a in the high-strength bolt hole 9 formed thereon as shown in Fig. 5. The highstrength bolt 3 is then fitted with a washer 6b and a nut 5b from downside and 10 fixed to the concrete placing portion 2a by driving these nuts 5a and 5b from both sides so that the bolt 3 is not limited to the above mentioned manner but may be conducted, for example, by inserting the bolt 3 from downside of the concrete placing portion 2a to the bolt hole 9 and driving a nut 5c from upside, as shown in Fig. 6 in which numeral symbols 6c and 6d designate washers. In either case, predetermined axial force is added to the high-strength bolt 3 to stock the frictional resistance required. Height of the high-strength bolt 3 is preferably within a range from a neutral axis level to an upper covering thickness of concrete to be placed.
6 Reinforcing bars 7 and 8 are then arranged above the steel plate 2 while side forms are assembled, followed by placing concrete 10 thereon.
The forms are assembled to leave the jointing portions 2b at both sides of the steel plates 2 to the axial direction of a bridge for connecting neighbouring precast floor slabs 1, a single jointing portion being left at one side of the steel plate in case of an outmost panel. The forms are removed after the concrete is placed.
In this manner, there is prepared the precast floor slab 1 composed of a steel plate and concrete.
Joint structure for connecting precast floor slabs to each other is shown in Figs. 3 and 4.
In order to provide the joint structure, first of all, the steel plate jointing
*SSSSS
S S portions 2b of the above mentioned precast floor slabs 1 are opposingly faced each other, while reinforcing bars 8 directed to the bridge axis are overlapped (the bars 8 are conventionally arranged in advance to overlap each other.) PA\WPDOCS\DYSspdci\7610391 spo.do-14 Novrba 2002 -7- After a splice plate 4, which has high-strength bolt holes 9 corresponding to those high-strength bolts formed on the jointing portions 2b, is attached on the undersurface of the portions 2b, the headed high-strength bolts 3 fitted with a washer 6a and a nut 5a at downward portion are inserted in holes 9 from upper side thereof, the high-strength bolt holes 9 being invisible because of the inserted bolts 3 in Figs. 3 and 4. A washer 6b and a nut 5b are then fitted to the high-strength bolts 9 from underside of the auxiliary plate 4 and driven to fasten thereof from both sides together with the nut 5a. The high-strength bolts 3 are thus fixed as a shear connector to the jointing portions 2a, thereby both portions 2a of the precast floor slabs 1 to be connected being friction-jointed each other. As a matter 10 of course, the high-strength bolts 3 may be fixed in any other manner, for example, by way of fixing described in Fig. 4. Preferably, height of the high-strength bolts 3 is within a •range from the neutral axis level to the upper covering thickness.
*ooo o S•After the reinforcing bars 7 are arranged, concrete is placed on the jointing portions 2b to complete the joint structure. Fig. 3 shows a situation where concrete is not placed.
*go• The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that the prior art forms part of the common general knowledge in Australia.
Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" or "comprising" will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
Claims (3)
1. A floor slab assembly comprising first and second precast floor slabs each comprising: a steel plate including a concrete later receiving portion and an edge portion, the concrete layer having bolt holes therein arranged at predetermined intervals; high-strength bolts inserted in the bolt holes and fitted with nuts to form shear connectors; and a concrete layer above the steel plate and into which the bolts project: the edge portions of the steel plates of the floor slabs having bolt holes therein and 10 being arranged side by side with a splice plate which has further bolt holes therein being attached to the undersurfaces of the edge portions of the steel plates by high-strength bolts which are inserted through the bolt holes in the splice plate and the edge portions, and fitted with nuts to form shear connectors, the bolts projecting into a concrete infill strip between the concrete layers of the floor slabs.
2. A floor slab assembly according to claim 1 wherein the bolts include upper free ends which terminate in the region of an upper portion of the concrete layer.
3. A floor slab assembly substantially as herein described with reference to, or with 20 reference to and as illustrated in Figs. 3 and 4 or the accompanying drawings. Dated this the 14th November, 2002 SHO-BOND CORPORATION By Their Patent Attorneys DAVIES COLLISON CAVE
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU80833/98A AU756564B2 (en) | 1995-07-04 | 1998-08-19 | Precast floor slab composed of a steel plate and concrete joint structure thereof |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7-189759 | 1995-07-04 | ||
| AU58368/96A AU5836896A (en) | 1995-07-04 | 1996-07-04 | Precast floor slab composed of a steel plate and concrete and joint structure thereof |
| AU80833/98A AU756564B2 (en) | 1995-07-04 | 1998-08-19 | Precast floor slab composed of a steel plate and concrete joint structure thereof |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU58368/96A Division AU5836896A (en) | 1995-07-04 | 1996-07-04 | Precast floor slab composed of a steel plate and concrete and joint structure thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU8083398A AU8083398A (en) | 1998-10-22 |
| AU756564B2 true AU756564B2 (en) | 2003-01-16 |
Family
ID=3743679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU80833/98A Ceased AU756564B2 (en) | 1995-07-04 | 1998-08-19 | Precast floor slab composed of a steel plate and concrete joint structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU756564B2 (en) |
-
1998
- 1998-08-19 AU AU80833/98A patent/AU756564B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| AU8083398A (en) | 1998-10-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK5 | Application lapsed section 142(2)(e) - patent request and compl. specification not accepted | ||
| NA | Applications received for extensions of time, section 223 |
Free format text: AN APPLICATION TO EXTEND THE TIME FROM 20010130 TO 20021230 IN WHICH TO OBTAIN ACCEPTANCE HAS BEEN LODGED |
|
| NB | Applications allowed - extensions of time section 223(2) |
Free format text: THE TIME IN WHICH TO OBTAIN ACCEPTANCE HAS BEEN EXTENDED TO 20021230 |
|
| FGA | Letters patent sealed or granted (standard patent) |