US3761046A

US3761046A - Table for concrete casting

Info

Publication number: US3761046A
Application number: US00197301A
Authority: US
Inventors: K Jessop
Original assignee: Stelmo Ltd
Current assignee: Stelmo Ltd
Priority date: 1971-07-09
Filing date: 1971-11-10
Publication date: 1973-09-25
Anticipated expiration: 1990-09-25
Also published as: GB1324627A

Abstract

A table for casting concrete comprising two girders held in parallel spaced apart relationship by cross-members extending through apertures in the webs of the girders and attached thereto. Further members extend parallel to the girders and are supported on the cross-members such that the face of the further members remote from the cross-members lies in the same plane as the flanges of the girders. A concrete casting plate lies over and is attached to the flanges of the girders and faces of the further members. Means may be provided for connecting two such tables in an end-to-end manner with the girders aligned and the plates co-planar. Mounting means may be provided on the ends of the cross-members.

Description

United States Patent [1 1 J essop [451 Sept. 25, 1973 [54] TABLE FOR CONCRETE CASTING 3,256,670 6/1966 Tersigni 52/666 X 1,100,488 6/1914 OKeiff 249/47 X [751 Invenm Kenna cube" Ashfmd, 3,019,866 2/l962 Grabowski 287/l89.36 F

Kent, England [73] Assignee: Stelmo Limited, Kent, England Prim ry Examiner-H l y, 1 Filed: Nov. 10, 1971 AttorneyBever1dge & De Grand:

[ pp 197,301 57 ABSTRACT A table for casting concrete comprising two girders [30] Foreign Application Priority Data held in parallel spaced apart relationship by cross- July 9, 1971 Great Britain 32,266/71 members extending through apertures in the webs of the girders and attached thereto. Further members ex- 52 us. Cl. .[249/18, 52/667, 425/432 tend Parallel to the girders and are Supported on the 51 Int. Cl E04,; 11/00 cross-members Such that the face of the further [58] Field of Search 249/18, 26, 2s, 30, hers rcmote from the Cross-members lies in the same 249/117, 119, 120, 187, 188, 189, 192, 195, plane as the flanges of the girders. A concrete casting 37 39 0 163, 219 126, 7; 52/664, plate lies over and is attached to the flanges of the gird- 666, 7 5; 2'g7/1 9 3 F, 13935; 425 432 ers and faces of the further members. Means may be provided for connecting two such tables in an end-to- 5 References Cited end manner with the girders aligned and the plates co- UNITED STATES PATENTS planar. Mounting means may be provided on the ends of the cross-members. 2,846,931 8/1958 Priest 3.047.931 8/1962 Boettner 249/18 11 Claims, 5 Drawing Figures 33 33 I=== r= r- I A 2 ,t ,r: :2 r L y:; E3. in w oil? 1| 3.5L i 4 0 2 PATENTED SEP25 I973 sum 1 nr 3 PATENTEDSEPZSVIQYS sum .3 OF 3 TABLE FOR CONCRETE CASTING This invention relates to tables for casting concrete.

The invention provides a table for concrete casting, comprising at least two girders, each having a web and at least one flange, which girders are held in spaced apart relationship with their webs parallel and their flanges in a common plane, the webs of the girders having opposed apertures at spaced apart intervals along the length thereof, at least two cross-members each extending through an opposed pair of apertures respectively and secured to the girders, a plurality of further members extending parallel to the girders and supported on the cross-members each further member having a face remote from the cross-members which faces lie in the plane of said flanges, and a casting plate attached to the flanges and said faces of the further members respectively. I

An advantage of such a construction of table is that the table has good rigidity characteristics. A further advantage is that air or other fluid such as gas or water va pours may circulate freely through the apertures in the girders.

The girders and/or the cross-members and/or the further members may be of l-section.

In the case in which the girders are of I-section, the webs of the girders may have six-sided apertures formed at regular intervals along the length thereof. Such girders may beof the kind known as Castella girders.

The apertures through which the cross-members pass may be provided with recesses whichreceive the corners of the cross-members to hold the cross-members against rotation relative to the girders.

Means may be provided at each intersection between a cross-member and a girder to reinforce such intersection, the means comprising a member having two surfaces extending perpendicular to one another, oneof the surfaces being attached to the web of the girder and the other surface being attached to the respective cross-member.

In any of the above arrangements, there may be provided diagonally extending bracing members, which are attached to the cross-members on the sides thereof remote from the further members.

Means may be provided for connecting the table to a further table also provided with such connecting means so that the girders of one table are in line with the respective girders of the other table.

In the last described arrangement, said connecting means may comprise at or adjacent the end of each girder, blocks having two faces substantially perpendicular to one another, one of the faces being attached to the web of the girder and the other of the faces being attached to the adjacent flange of the girder, each of the blocks having'a hole extending therethrough parallel to the length of the girder.

In any of the above described arrangements, each end of each cross-member may be provided with .a mounting plate extending perpendicularly to the "length of the member, which plate is provided with holes for the attachment of supports and/or vibrators for the table.

Pillars may be attached to at least four mounting plates of a table, each pillar being similarly disposed and-extending in a direction perpendicular .to the plane of the casting plate and having on one end a spigot and on its other end a socket for receipt of the spigot of a similar pillar, each pillar also having a pin extending parallel to the girders of a table which pin may be received in a support for the table such that the table may be pivoted about the pins or the pillars on one side of the table.

By way of example, one specific embodiment of the invention will now be described, reference being made to the accompanying drawings in which:

FIG l is a side view of a concrete casting table;

FIG. 2 is an end view of the table of FIG. 1;

FIG. 3 is an under plan view of the table of FIG. 1;

FIG. 4 is a detail view of a part of the table of FIGS. 1 and 2; and

FIG. 5 is an end view of a concrete casting table having supporting pillars attached and in a part-elevated position.

The concrete casting table shown in FIGS. 1, 2 and 3 comprises a main frame 10 havinga flat plate 11 attached thereto, the plate 11 providing a surface on which concrete slabs, beams and the like may be cast.

The main frame 10 comprises two

parallel girders

12, 13 extending lengthwise of the frame and held in a spaced apart relationship by means of three crossmembers 14. Each

girder

12 and 13 is of l-section, having flanges l7, l8, and a web 19,. the web being provided with a series of six-sided apertures 20, at regularly spaced intervals along the length thereof. Such girders are known as castella girders.

Each cross-member 14 is of I-section and extends perpendicularly to the

girders

12, 13 through an opposed pair of apertures in the webs 19 of the girders. As best seen in FIG. 4, four of the sides of each aperture 20 through which a crossmember passes are notched with recesses at 21 to receive the outer parts of the flanges 22 of the respective cross-member 14, such that the cross-member is held against rotation with respect to the girder. Each cross-member is attached to the web of the girder through which it passes by means of reinforcing blocks 23 of rectangular section, which have one face welded to the web 19 and a second face perpendicular to said one face welded to a flange 22 of the cross-member. Four such blocks 23 are provided at each intersection between a crossmember 14 and a

girder

12 or 13.

The cross-members 14 support further members 24,

, also of I-section, the lower flanges 25 of which bear on the cross-members l4 and the upper flanges 26 of which lie in the same plane as the flanges 17 of the

girders

12, 13. The further members 24 are attached to the cross-members by welding at each intersection.

Four generally diagonally extending members 34, of

, right-angle section, are attached in the flanges of the cross-members 14 on the side remote from the further members 24, to provide X-bracing for the main frame 10.

The concrete casting plate 11 bears on the flanges 17 and 2d of the

girders

12, 13 and further members 24 respectively, and is welded thereto. A downwardly extending skirt 27 is provided around the periphery of the plate 11, and along the ends 28, 29 of the table, the skirt is provided with a plurality of holes 30, for a purpose to be described below.

Blocks 31 are attached to the ends of the

girders

12, 13, adjacent the line of intersection between a flange of the girder and its respective web, four such blocks thus being attached at each end of each girder. Each block has a face which engages the web, the respective girder, and a second face at a suitable angle to the first face and which engages the respective flange, the blocks being held in position by welding. A bore 32 is provided in each block 31, which bore extends parallel to the length of the girder.

The ends of the cross-member 14 are cut off square, and are provided with mounting plates 33 extending in a plane perpendicular to the length of the respective cross-member. Each plate 33 has six holes extending therethrough, and is welded to the respective crossmember. The plates may be used as mounting points for support pillars for the table, such as is shown in FIG.

The support pillars 35 (FIG. 4) comprise a thickwalled tube 36 having bracing members 37 connecting the tube 36 to a flat plate 38 lying in a plane parallel with the axis of the tube. The plate 38 is drilled with holes corresponding to the holes in the plates 33 on the cross-members l4 and is attached to such a plate by means of bolts passing through the registering holes. A further brace 39 is attached to the tube 36 and extends perpendicularly therefrom along the underside of the lower flange of a cross-member 14. The brace 39 is attached to the lower flange by means of bolts.

The lower end of the tube 36 has a plate 40 welded thereto, the plate 40 having a hole formed therein coaxial with the tube 36. The upper end of the tube 36 has a spigot 41 attached thereto, the spigot being coaxial with the tube and of generally conical shape at its end with a cylindrical portion 42 adjacent the tube 36, the cylindrical portion 42 being of the same diameter as the hole in the plate 40.

Part-way between the ends of the tube 36, a horizon tally extending pin 43 is provided, which pin 43 projects from both sides of the tube. The pin extends in a direction parallel to the plane of the plate 38. Part-way between the pin 43 and the spigot 41, a bore 44, parallel to the pin 43, is provided through the tube 36.

The pin 43 may be supported in a bracket attached to the ground, such as that shown at 45 in FIG. 5. The bracket 45 comprises two spaced apart upright plates 46 (only one of which is visible in FIG. attached to a base plate 47. Triangular gusset plates 48 are welded to the upright plates 46 and to the base plate 47. The base plate 47 is secured to the ground, for example by bolts 48. The upper ends of the upright plates 46 are formed with slots 49, the ends of which are of the same radius as the pin 43, and the sides of which taper together towards the end. The tube 36 is located between the two upright plates 46, with the pin 43 bearing on the radiused ends of the slots 49, such that the tube 36, and hence the concrete casting table, may pivot about the axis of the pins 43.

A stirrup 50 is pivotally attached to each of the pillars 35 on the side of the table remote from the brackets 45, by means of a bolt passing through the hole 44 in the respective tube 36 and through holes formed in the stirrup. A hoist or other lifting means may then be used to pivot the table about the pins 43 in the brackets 45, the hoist engages the stirrups 50.

A folding prop 51 is provided in order to secure the table when it has been hoisted to an elevated position, as shown in broken lines in FIG. 5.

In order to effect heating of the table, a matrix of fluid ducts (not shown) may be attached to the underside of the concrete casting plate 11, and/or to the main frame 10. Heated fluid may then be pumped through the fluid ducts.

In use, the concrete casting table is provided with shuttering suitable for the beam or slab of concrete to be cast. The table is mounted in a suitable manner on the ground, and such mountings may comprise, for example, resilient supports engaging the

girders

12, 13, in which case, vibrators may be attached to the mounting plates 33. Alternatively, the table may be mounted directly on vibrators which engage the

girders

12, 13. In this case pillars 35 may be attached to the mounting plates 33, and a further similar table, also having pillars 35 attached to its mounting plates, may be supported on the pillars 35 of the first table, the spigots 41 of the pillars 35 on the lower table engaging the holes in the plates 40 of the pillars on the upper table. It will be appreciated that the pillars may be used for stacking tables, or for lifting and pivoting movements of a table.

Two or more similar tables may be connected together in line to provide a long casting table. To effect a connection between two tables, the

girders

12 and 13 of the two tables are aligned, and bolts passed through the bores 32 of adjacent blocks. Further bolts are passed through the registering holes 30 in the skirts 27 of the tables at their adjacent ends. In this way, a rigid connection between the two tables is achieved, which is advantageous when slabs or beams longer than a single table are being cast, since relative movement or flexing between connected tables can cause breakages of the slabs or beams when set.

To accelerate setting of the concrete, heated fluid may be passed through the ducts (not shown) on the underside of a table, where provided; In this case, and particularly when two or more tables are stacked, the apertures 20 allow free movement of heated air, gas, water vapour or other fluid which assists in uniform heating of the table.

I claim:

1. A table for concrete casting comprising at least two girders, each having a web and at least one flange, which girders are held in spaced apart relationship with their webs parallel and their flanges in a common plane, the webs of the girders having opposed apertures at spaced apart intervals along the length thereof; at least two cross-members each extending through an opposed pair of apertures respectively and secured to the girders; a plurality of further members extending parallel to the girders and supported on the cross-members, each further member having a face remote from the cross-members which faces lie in the plane of said flanges; a casting plate attached to the flanges and said faces of the further members respectively; a mounting plate provided at each end of each cross-member and extending perpendicularly to the length thereof, which plate is provided with holes for the attachment of supports and/or vibrators for the table; and pillars attached to at least four mounting plates of a table, each pillar being similarly disposed and extending in a direction perpendicular to the plane of the casting plate and having on one end thereof a spigot and on its other end a socket for receiving the spigot of a similar pillar, each pillar also having a pin extending parallel to the girders of a table which pin is receivable in a support for the table such that the table may be pivoted about the pins of the pillars on one side of the table.

2. A table as claimed in claim 1 wherein the girders are of I-section.

3. A table as claimed in claim 1 wherein the webs of the girders have six-sided apertures fonned at regular intervals along the length thereof.

4. A table as claimed in claim 1 wherein the crossmembers are of l-section.

5. A table as claimed in claim 1 wherein the further members are of I-section.

6. A table as claimed in claim 1 wherein the apertures through which the cross-members pass are provided with recesses which receive the corners of the crossmembers to hold the cross-members against rotation relative to the girders.

7. A table as claimed in claim 1 wherein means are provided at each intersection between a cross-member and a girder to reinforce such intersection, the means comprising a member having two surfaces extending perpendicular to one another, one of the surfaces being attached to the web of the girder and the other surface being attached to the respective cross-member.

8. A table as claimed in claim 1 wherein there are provided diagonally extending bracing members, which are attached to the cross-members on the sides thereof remote from the further members.

9. A table as claimed in claim 1 wherein means are provided for connecting the table to a further table also provided with such connecting means so that the girders of one table are in line with the respective girders of the other table. 1

10. A table as claimed in claim 9 wherein said connecting means comprise, at the end of each girder, blocks having two faces arranged with one of the faces attached to the web of the girder and the other of the faces attached to the adjacent flange of the girder, each of the blocks having a hole extending therethrough parallel to the length of the girder.

11. A table for concrete casting, comprising a. at least two girders each having a web and at least one flange, which girders are held in spaced apart relationship with their webs parallel and their flanges in a common plane;

b. said webs of each girder having a number of hexagonal apertures spaced apart lengthwise of the girder, the aperture in one girder being spaced opposite the aperture in the other girder;

c. at least two I-section cross-members each extending through an opposed pair of said hexagonal apertures respectively having flange faces parallel to said plane;

d. said hexagonal apertures through which said crossmembers extend each being notched to receive said cross-member ends in close-fitting relationship to prevent rotation of the cross-members in said apertures;

e. block members rigidly attached to said faces of each flange of each cross-member one on each side of the webs of the girders, said blocks being rigidly attached to the webs of the girders fixedly securing the cross-members to the webs;

f. a plurality of further members extending parallel to the girders and supported on the cross-members, each further member having a face remote from the cross-members, which faces lie in the plane of said flanges; and

g. a casting plate attached to the flanges and said faces of the further members respectively.

Claims

2. A table as claimed in claim 1 wherein the girders are of I-section.

3. A table as claimed in claim 1 wherein the webs of the girders have six-sided apertures formed at regular intervals along the length thereof.

4. A table as claimed in claim 1 wherein the cross-members are of I-section.

5. A table as claimed in claim 1 wherein the further members are of I-section.

6. A table as claimed in claim 1 wherein the apertures through which the cross-members pass are provided with recesses which receive the corners of the cross-members to hold the cross-members against rotation relative to the girders.

9. A table as claimed in claim 1 wherein means are provided for connecting the table to a further table also provided with such connecting means so that the girders of one table are in line with the respective girders of the other table.

11. A table for concrete casting, comprising a. at least two girders each having a web and at least one flange, which girders are held in spaced apart relationship with their webs parallel and their flanges in a common plane; b. said webs of each girder having a number of hexagonal apertures spaced apart lengthwise of the girder, the aperture in one girder being spaced opposite the aperture in the other girder; c. at least two I-section cross-members each extending through an opposed pair of said hexagonal apertures respectively having flange faces parallel to said plane; d. said hexagonal apertures through which said cross-members extend each being notched to receive said cross-member ends in close-fitting relationship to prevent rotation of the cross-members in said apertures; e. block members rigidly attached to said faces of each flange of each cross-member one on each side of the webs of the girders, said blocks being rigidly attached to the webs of the girders fixedly securing the cross-members to the webs; f. a plurality of further members extending parallel to the girders and supported on the cross-members, each further member having a face remote from the cross-members, which faces lie in the plane of said flanges; and g. a casting plate attached to the flanges and said faces of the further members respectively.