KR100627863B1 - Device for assembling latticework metal framework members - Google Patents

Abstract

The device forms a decomposable "butt jointed" assembly of hollow shaped members 2 belonging to two stackable framework structures 1. The apparatus includes a socket-shaped lower portion 7 welded to an upper end of a member 2 belonging to the lower frame structure 1, and a breast inserted into a lower portion of the member 2 belonging to the upper frame structure 1. a connecting body 5 consisting of an upper part 6 in the form of a tang. The tube-shaped upper part 6 has two orthogonal transverse bores 10, 11 through which the gagable connecting pins 25, 26 pass. It is applied to the coupling of the tower structure 1 of the tower crane.

Description

Device for assembling latticework metal framework members

1 is a perspective view showing two tower structures (one partially shown) of a tower crane in an assembled state using the apparatus of the present invention.

Figure 2 is an enlarged perspective view of the connecting body of the assembling apparatus of the present invention.

3 is a vertical sectional view of the seam region between two members assembled using the apparatus of the present invention.

The present invention relates to an apparatus for degradable assembly used in "butt join" members of a grating metal frame structure. The invention is preferably used for the connection of tower structures of tower cranes which can be used in building construction sites.

The tower of such a crane consists of stackable tower structures which must be assembled or separated depending on whether the crane needs to be constructed, constructed or disassembled.

Each of the tower structures, which are generally square in horizontal cross section, consists of four vertical edge members connected in pairs by cross-bracing consisting of horizontal cross members and diagonal members. When the crane is built, the tower structures are arranged in the vertical direction and are firmly connected to each other by the corner members of the structure. The “butt joints” between these corner members must ensure the continuity of the tower's upright and carry longitudinal and transverse loads due to various influences.

The members of two consecutive tower structures are usually assembled using a joint plate using a joining piece to form a double tang, the lower part of the member of the upper tower structure and the upper part of the corresponding member of the lower tower structure. Is connected by a pin.

The assembly apparatus disclosed in the Applicant's French Patent Application Nos. 2, 680, 813 uses an internal connection of a suitable, in particular square cross section, for the butt joint of the hollow shaped members. This connecting body is fixed to each member by two orthogonal connecting pins passing through the connecting bodies and the bores formed in the member. Thus, this connecting body is fixed to the lower part of the member of the upper tower structure by two orthogonal and removable connecting pins. In contrast, this connector is fixed to the upper part of the member of the lower tower structure by two permanently mounted orthogonal and removable additional connecting pins, each connecting pin being an area of the bore through which the connecting pin passes. At, it has a head held in place by a catchplate welded to an already welded filling bar on the outside of the member of the lower tower structure. The connection is thus permanently fixed to the top of the lower tower structure's members by pre-installation work done at the factory, and the decomposable connection directed at the site where the tower crane is used between the connection and the member of the upper tower structure. It's just about connections.

The known example is still relatively complex and given the large number of parts (connection pins, pin swivel, charging bar), even if what is actually required is a permanently rigid connection, the lower part of the connection to the member of the lower tower structure A lot of work is required to connect. If each part has its own reliability, the reliability of such a connection with many parts needs to be improved because the overall reliability of such an assembly combining multiple parts is lower than that of each part. Pinholes through the connectors and members, and welded filling bars, result in uneven stress gradients in the upper portions of the members connected to the connectors. Bonding between the connecting body and the top of the member causes wear and loosening, which is due to the phenomenon of fretting corrosion. The connecting pins and the body of the connection are also subject to corrosion.

Thus, the known assembly apparatus mentioned here still has various disadvantages, and the present invention seeks to obviate these disadvantages. Accordingly, it is an object of the present invention to simplify the assembly apparatus, reduce the number of components and the number of operations to be performed, thereby making it more reliable and at the same time improving the quality and durability of the assembly.

For this purpose, in accordance with the present invention, an apparatus for decomposable assembly used in a hollow butt joint member of a grid-shaped metal frame structure, the apparatus comprising a top portion of a yomb shape and a bottom portion of a socket shape Comprising a connecting body, the cam-shaped upper portion having a cross section corresponding to the hollow inner cross section of the member, and having at least two transverse bores staggered with each other in an orthogonal direction, these bores having an upper side Adapted to receive a removable connection pin introduced through a bore formed in the lower portion of the member belonging to the framework structure and coupled to the upper portion of the yom shape, wherein the lower portion of the socket shape is less than the cross section of the upper portion of the yoke shape. Having a large cross section, at its base, welded to the upper part of the member belonging to the lower skeleton structure An apparatus for degradable assembly of a lattice metal frame structure is provided.

This assembly device, on the one hand, is permanently fixed to the top of the member of the lower frame structure by welding, and on the other hand, the connecting body to which the lower part of the corresponding member of the upper frame structure is coupled, And a removable pin that provides a firm but non-permanent connection between the lower portion of the member and the corresponding cam-shaped portion of the corresponding connector.

When the present invention is applied to the joining of the tower structure of the tower crane, the connectors are welded to the top of the corner members of the lower tower structure by their socket-shaped parts, and the yomb shaped parts of these connectors are the corner members of the upper tower structure. It is designed to be introduced at the bottom of the field. Of course, the upper tower structure also acts as the lower tower structure for other tower structures stacked thereon.

Advantageously, each connector is a casting or forging of weldable mechanical steel. The socket part of this connection can be welded to the top of the member belonging to the lower frame structure, in particular by flash welding.

According to one preferred embodiment of the present invention, the socket portion of the connection has a topped arcuate central recess that is open at the bottom of the socket portion, such that the material cross section of the socket portion is bottomed from the top thereof. Continuously decreasing so that the sides of the socket portion have a thickness that decreases from top to bottom. The truncated arcuate central recess makes it possible to obtain a uniform stress gradient between the minimum cross section at the bottom of the socket portion and the maximum cross section at the top of the socket portion.

In a particular embodiment, the sides of the socket portion comprise two outer sides and two inner sides, and the minimum thickness of the two outer sides measured at the bottom of the socket portion is such that the socket portion 7 is welded. The minimum thickness of the two inner faces, measured at the bottom of the socket portion, equal to the thickness of the corresponding flange of the member belonging to the lower frame structure, is greater than the thickness of the flange of the member belonging to the lower frame structure. . Thus, the two outer faces constitute a reference face to ensure perfect continuity with the members of the lower frame structure, and the two thicker inner faces, in particular, allow the members to carry two L-shaped parts along their longitudinal edges. When constructed by welding with each other, the member is designed to reduce the expansion effect on the transverse dimension. Thus, the thick inner face ensures that there is an optimum cross section which is particularly useful for welding the socket portion to the top of the member by flash welding.

Here, the expressions "outer side" and "inner side" refer to two sides of the socket portion appearing on the outside of the frame structure (such as the tower structure), and two other sides of the socket portion appearing on the inside of the frame structure, respectively. Pointing to the sides, the socket portion has a total of four sides, which sides correspond to the four sides of the square horizontal cross section.

The upper surface of the socket portion of the connection forms a bearing surface having a width greater than the thickness of the inner flange of the member relative to the inner flange of the member belonging to the upper frame structure.

According to a further advantageous embodiment, the cambe part of the connecting body has an upper surface of the socket part which acts as a bearing surface for the lower end face of the member belonging to the upper frame structure in the region where the cambe part meets the socket part. It has a round peripheral groove that meets. This peripheral groove makes it possible to reduce the level of stress concentration in the area where the lower part of the yomb part of the connection and the upper part of the socket part meet.

As a whole, the present invention provides an optimized assembly apparatus, in particular and having the following advantages compared to the known apparatus mentioned above.

Reducing the number of components (eliminating the need for connecting pins, filling bars, and pin catchpieces) simplifies the structure of the lower part of the connection, thus reducing the number of fabrication and connection operations required. .

Safer assembly is possible due to the reduced number of components.

Since the pinholes and filling bars are omitted, the stress gradient at the top of the member belonging to the lower frame structure to which the connection is welded is more uniform.

In particular, the socket part has a width inwardly exceeding the thickness of the inner flange of the upper member, which reduces the risk of expansion, and thus excellently supports the compressive load on the machined upper surface of the socket part.

By means of flash welding, which does not require special preparation of the surface to be welded, it is possible to weld the connection to a member of steel of non-uniform nature, and also to ensure that this welding method achieves consistent and reproducible quality. Can be automated.

Reduce wear and loosening due to fretting corrosion by eliminating the pin connection between the upper part of the member belonging to the lower frame structure and the lower part of the connector.

-Eliminate corrosion of the lower part of the connector;

-The surface of the member can be surface treated (painted) in a single operation.

In any case, the present invention is preferably from the following description described with reference to the accompanying drawings, which shows, by way of example, one embodiment of an apparatus for assembling members of a grating metal frame structure, which is applied to the connection of a tower structure of a tower crane. Will be understood.

1 shows two consecutively stacked tower structures 1 belonging to a tower crane. Each tower structure 1 has four corner members 2 that are square in horizontal cross-sectional shape and are arranged vertically, and these four corner members 2 comprise horizontal intersecting members 3 and diagonal members ( They are connected in pairs on the four sides of the tower structure 1 by cross-bracing consisting of 4). Each corner member 2 is advantageously formed by joining two L-shaped members by welding along their longitudinal edges so as to form a tubular member having a substantially square horizontal cross section, the horizontal of the corner member 2 being The arrangement direction of the cross section is similar to that of the square cross section of the tower structure 1.

Thus, the corner members 2 of the tower structure 1 are open at the upper and lower ends so that the upper and lower corner members 2 are assembled by a connecting member 5 belonging to the device for disassembly assembly which is the subject of the present invention. . Each connector 5, shown in detail in FIG. 2, is a casting of weldable mechanical steel comprising a tang-shaped upper part 6 and a socket-shaped lower part 7 or It is a forging.

The top portion 6 of the cambe shape is square in horizontal cross-sectional shape and has a center point 8 and a chamfer portion 9 at its upper end. The upper part 6 of the connecting body 5 has two identical and superimposed bores 10, 11 formed in two orthogonal horizontal directions. The axis of the lower bore 10 intersects at right angles with the two opposing vertical surfaces 12 of the upper portion 6 and extends from one side to the other, with the axis of the upper bore 11 opposite the other two. And cross at right angles to the vertical plane 13 to extend from one plane to the other. The axes of the two bores 10, 11 are shifted perpendicular to each other by a height greater than the diameter of these bores. Each of these bores 10, 11 has two consecutive portions of slightly different diameter, in the direction of their axis, each of which is separated from each other by internal annular shoulders 14, 15.

The top portion 6 of the cambe shape provides one of its vertical edges with a marking for identifying the connector 5 and its properties for the purpose of "traceability". It has a recess forming a flat surface 16 designed for this purpose.

Finally, the cam-shaped upper portion 6 has a rounded peripheral groove 17 in the region where its base meets the socket-shaped lower portion 7, and of the peripheral groove 17. The shape and size are chosen to make it possible to reduce the stress concentration level where the lower part of the yom-shaped upper part 6 and the upper part of the socket-shaped lower part 7 meet.

The lower portion 7 of the socket shape has a horizontal cross-sectional shape at regular times, which is larger than the cross section of the upper portion 6 of the yomb shape. The lower part 7 also has a central recess 18 that opens to its bottom. The central recess 18 of the lower part 7 has an arcuate shape with a cut off top, so that the material of the horizontal section in this part of this lower part 7 is the maximum at the top of this lower part 7. Gradually decreasing from the bottom to the minimum at the bottom of this lower portion 7.

The horizontal upper surface 19 of the socket-shaped lower portion 7 surrounding the peripheral groove 17 is machined and the machined lower end surface of the corner member 2 of the upper tower structure 1. Make up a completely flat support surface (see FIG. 3). On the side of the two inner flanges of the corner member 2, the upper surface 19 of the socket-shaped lower part 7 has a width L greater than the thickness of the inner flange of the corner member 2.

The horizontal bottom 20 of the socket-shaped lower part 7 is welded to the upper end face of the corner member 2 of the lower tower structure 1, in particular by flash welding.

The four sides of the lower portion 7 of the socket shape comprise two outer faces 21 (ie, faces located outside the tower structure 1) and two inner faces 22. Considering the arcuate shape of which the top of the central recess 18 is cut off, all of these side surfaces 21 and 22 decrease in thickness from top to bottom.

The two outer faces 21 of the socket-shaped lower part 7 have a thickness e at their base which is equal to the thickness of the corresponding outer flange of the corner member 2 of the tower structure 1 (FIG. 3). Reference). These outer surfaces 21 constitute a reference surface and are located exactly in series with the corresponding surfaces of the corner members 2 of the tower structure 1.

The two inner faces 22 of the socket-shaped lower part 7 have a thickness E at their base that is greater than the thickness of the corresponding inner flange of the corner member 2 of the tower structure 1. This large thickness E compensates for the expansion of the transverse dimension of the corner member 2, in particular when the corner member 2 is formed of two L-shaped members joined together, and also the lower tower structure 1. Ensures an optimum welding cross section for flash welding the socket-shaped lower part 7 to the upper end face of the edge member 2.

By welding four connectors 5 by means of socket-shaped lower parts 7 to the top of the corner member 2 of the lower tower structure 1, four to the top of the lower tower structure 1. The tower structure 1 is provided with the top portion 6 of the yomb shape facing upwards.

When building the crane, the upper tower structure 1 such that the four cam-shaped upper portions 6 of the lower tower structure 1 couple to the lower ends of the four corresponding edge members 2 of the upper tower structure 1. It is disposed above the lower tower structure 1. The lower end face of each corner member 2 of the upper tower structure 1 has a socket-shaped lower portion 7 of the corresponding connector 5 welded to the corner member 2 of the lower tower structure 1. Supported by the upper surface 19.

When the lower ends of the corner members 2 of the upper tower structure 1 are mounted to the cam-shaped upper portions 6 of the connectors 5 welded to the lower tower structure 1, these cam-shaped upper portions ( The bore 10, 11 of 6) is aligned with the corresponding bore 23 formed in the flange of the corner member 2 on the lower end side of the corner member 2 of the upper tower structure 1, and acts as a reinforcement part. Filling bars 24 are welded around the bores 23. The cambed upper part 6 of the connecting body 5 and the lower end of the corresponding corner member 2 of the upper tower structure 1 are assembled using two connecting pins 25, 26 (see FIG. 1). ). The first connecting pin 25 is inserted into the lower bore 10 of the cam-shaped upper part 6 and passes through the bores 23 of the corner member 2 aligned with the bore 10. The second connecting pin 26, orthogonal to the first connecting pin 25, is inserted into the upper bore 11 of the cam-shaped upper part 6, and the corner member 2 aligned with the bore 11. Passes through the bore 23.

Each of the connecting pins 26, 26 is continuously extended from one end to the other end, with an enlarged head, a large diameter cylindrical portion (a large diameter portion of the bore 10, 11 of the top portion 6 of the yoke shape). Correspondingly), a small diameter cylindrical portion (corresponding to a small diameter portion of the bores 10, 11), and a truncated conical end portion. In addition, removable parts are provided to prevent linear and rotational movements of the respective connecting pins 25, 26. A more detailed description of these means can be found in the aforementioned French patent application No. 2,680,813.

Once the assembly is achieved, the arcuate central recess 18 with the top of the socket-shaped lower portion 7 cut off has a small horizontal cross section (of the base of this lower portion 7) and a large horizontal cross section (this lower portion). It is possible to obtain a uniform stress gradient between the top of the part 7.

Of course, in the situation of building the tower crane, the same assembly operation, as described above, the socket-shaped lower portion 7 is welded to the upper end of the four corner members 2 of the tower structure 1 to connect four connections Repeat for each tower structure 1 that is stacked with each sieve 5.

In order to separate the two tower structures 1 stacked on the site, the locking means is removed to remove the connecting pins 25 and 26, and the corner members 2 belonging to the upper tower structure 1 are lowered. It is lifted and separated from the top-shaped part 6 of the yoke of the connecting body 5 which is held at the upper end of the corner member 2 of the tower structure 1.

The invention is, of course, not limited to the embodiment of the apparatus for assembling the members of the grating metal frame structure described above by way of example. On the contrary, the invention includes all modifications and applications which follow the same principle. In particular, the following configurations do not depart from the scope of the present invention:

-Change of details of the shape of the connecting body.

Using other suitable welding methods, such as electric arc welding, resistance welding or laser welding, as a method of welding the socket-shaped part of the connection to the top of the corner members of the lower tower structure.

-The application of this apparatus to the assembly of members of grid metal frame structures in technical areas other than tower cranes.

Claims (8)

In the device for decomposable assembly used in the hollow butt join member 2 of the lattice metal frame structure 1, the device comprises a tang-shaped upper part 6. Comprising connection bodies 5 consisting of a socket-shaped lower part 7, wherein the cambe-shaped upper part 6 has a cross section corresponding to the hollow inner cross-section of the member 2, and also in an orthogonal direction. At least two transverse bores 10, 11 intersected with each other, the bores 10, 11 having a bore 23 formed in the lower portion of the member 2 belonging to the upper frame structure 1. Is adapted to receive removable connection pins 25, 26 that are introduced through and coupled to the cam-shaped upper portion 6, wherein the socket-shaped lower portion 7 is formed of the cam-shaped upper portion 6. It has a cross section larger than the cross section, and at its base 20, the lower frame structure 1 Apparatus for degradable assembly of the grating metal frame structure, characterized in that it is adapted to be welded to the upper part of the member (2) belonging to (1). 2. The socketed lower portion 7 of the connecting body 5 is a topped arcuate central recess 18 that is open at the bottom of the socketed lower portion 7. Thus, the material cross section of the lower portion 7 of the socket-shaped decreases from its top to the bottom so that the sides 21, 22 of the lower portion 7 of the socket-shaped are from top to bottom. An apparatus for degradable assembly of grating metal frame structures, characterized by having an increasingly decreasing thickness. 3. The lower side of the socket shape according to claim 2, wherein the side surfaces of the socket-shaped lower portion 7 of the connector 5 comprise two outer side surfaces 21 and two inner side surfaces 22. The minimum thickness e of the two outer surfaces 21, measured at the bottom of the portion 7, belongs to the lower framework structure 1 to which the socket-shaped lower portion 7 is welded 2. The minimum thickness E of the two inner surfaces 22, which is equal to the thickness of the corresponding flange of, and measured at the bottom of the lower portion 7 of the socket shape, belongs to the lower frame structure 1. Apparatus for degradable assembly of a grid-shaped metal frame structure, characterized in that it is larger than the thickness of the flange of the member (2). 4. The member 2 according to claim 1, wherein the upper surface 19 of the socket-shaped lower portion 7 of the connecting body 5 belongs to the upper frame structure 1. Forming a support surface for the inner flange, wherein the width L of the support surface is larger than the thickness e of the inner flange of the member 2 for the degradable assembly of the grid metal frame structure. Device. The upper frame according to any one of claims 1 to 3, wherein in the region where the part meets the socket-shaped lower part 7 of the socket-shaped upper part 6 of the connecting body 5. Having a rounded peripheral groove 17 which meets the upper surface 19 of the socket-shaped lower part 7 which acts as a bearing surface for the lower end face of the member 2 belonging to the structure 1. Apparatus for degradable assembly of a lattice metal frame structure. 4. The decomposable assembly of a lattice metal frame structure according to any one of claims 1 to 3, characterized in that the connecting body (5) is a casting or forging made of weldable mechanical steel. Device. 4. The socket-shaped lower portion 7 of the connector 5 is flashed on top of the member 2 belonging to the lower frame structure 1. ) A device for degradable assembly of a grid metal frame structure, characterized in that it is welded by welding. 4. The device according to claim 1, wherein the device is applied to the connection of the tower structure 1 of the tower crane, the connecting body 5 being lowered by its lower portion 7 in the shape of a socket. Welded to the top of the corner member 2 of the tower structure 1, and the yomb shaped upper part 6 of the connecting body 5 is inserted into the bottom of the corner member 2 of the upper tower structure 1. Apparatus for degradable assembly of the grating metal frame structure, characterized in that.

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