CN215442343U - Can expand available building area's three-layer steel construction of encorbelmenting - Google Patents

Abstract

The utility model relates to the technical field of structures covering large-area spaces, and discloses a three-layer overhanging steel structure capable of expanding the available building area, which comprises a plurality of cross-layer trusses, wherein one ends of the cross-layer trusses are anchored on a vertical installation foundation, and the other ends of the cross-layer trusses are overhung outwards; the top supporting floor is laid on the upper chord of the cross-layer truss, the bottom floor is laid on the lower chord of the cross-layer truss, the hanging floor is hung under the cross-layer truss, and the pull rope is connected to the cross-layer truss at the lower end and is connected to the vertical installation foundation at the upper end in an upward direction; the suspension posts and the inhaul cable pairs are arranged in a one-to-one correspondence manner and connected to the same position on the lower chord together with the corresponding inhaul cable pairs; two guys of guy cable centering are connected in node lower chord both sides symmetrically, and the projection of guy cable in vertical direction falls outside the projection of the node lower chord that links to each other in vertical direction. The utility model obviously enlarges the available building area and does not need additional land occupation.

Description

Can expand available building area's three-layer steel construction of encorbelmenting

Technical Field

The utility model relates to the technical field of structures covering large-area spaces, in particular to a three-layer cantilever steel structure capable of expanding the available building area.

Background

Buildings such as exhibition halls require a high surface area and can be quickly erected when required for exhibition and can be expanded at any time due to changes in exhibition requirements. The truss structure building can simultaneously meet the two requirements of large span and fast construction, so the truss structure building is widely applied in exhibition halls.

The main reason for the fast construction of truss structures is that the roof and the supporting structure are prefabricated and can be constructed at one time, and if a multi-layer structure is involved, the construction still needs to be carried out layer by layer, and compared with the common building, the construction period has no obvious advantages. Therefore, most of the truss structure buildings are single-layer, the land utilization efficiency is poor, and additional occupied land is needed if the expansion is needed. This is fatal in a large city where the land price is high.

The truss has high tensile/compressive strength in the axial direction and high bending strength in the vertical direction, and thus can be used in various fields such as beams, columns, roofs and purlins. And because the truss can be connected with components such as steel cables, steel suspension posts and the like, the truss also has the using methods of adopting prestressed cables to carry out cable-stayed installation (such as various suspension bridges), adopting suspension posts/steel cables to hang parts under the truss and the like.

When the truss is used, the truss structure is possibly damaged due to the fact that the load on the truss and the connection node of the truss are unreasonable in design, stress analysis is needed to be carried out according to a specific use scene, and the connection node and the truss structure are reasonably designed according to a stress analysis result. And if the floors of the multi-storey truss building need to be built simultaneously, the stress condition of the multi-storey truss building becomes more complex.

Taking a cross-layer truss with an upward-pulling guy cable and a downward-pulling hanging post as an example, the applicant has experienced force analysis, and the truss is not suitable for simultaneously bearing outward-pulling force perpendicular to the truss between an upper chord member and a lower chord member, and the force is easy to break the truss into two pieces like a bamboo; the same chord of the truss can not bear too much shearing, otherwise, the truss can be broken; various rods forming the truss cannot be in cross contact with components such as the stay cable/the suspension post, otherwise, the transmission of force in the stay cable/the suspension post is influenced (the influence is particularly serious when the prestressed stay cable is adopted), and the cross contact position is rusted seriously due to different materials (electrochemical corrosion) and easy dust deposition.

The design of the cantilever steel structure with the hanging and the guy cable is particularly difficult because of the problems to be solved, such as that the cantilever structure is not suitable for hanging loads, and the guy cable is not suitable for crossing with other chords (various stress problems of the truss under the scene are pointed out by various documents such as CN104775524B, CN101265727B and the like).

SUMMERY OF THE UTILITY MODEL

The utility model provides a three-layer overhanging steel structure capable of expanding available building area.

The technical problem to be solved is that: due to the requirement on the construction period, most truss buildings as exhibition halls are single-layer, the occupied area is large, and extra occupied area is needed for extension. If the truss building is made into multiple layers, the construction period is not superior to that of a common building.

In order to solve the technical problems, the utility model adopts the following technical scheme: a three-layer overhanging steel structure capable of expanding available building area comprises a plurality of cross-layer trusses, wherein one ends of the cross-layer trusses are anchored on a vertical installation foundation, and the other ends of the cross-layer trusses are overhung outwards; the system also comprises a top bearing floor slab laid on the upper chord member of the cross-layer truss, a bottom floor slab laid on the lower chord member of the cross-layer truss, a hanging floor slab hung below the cross-layer truss through a hanging column, and a guy cable of which the lower end is connected to the cross-layer truss and the upper end is connected to the vertical installation foundation in an upward direction;

in the lower chords of the cross-layer truss, the lower chords overlapped with the projection of the upper chords in the vertical direction are marked as node lower chords, the guys are combined pairwise to form guy pairs, and the suspension posts are arranged in one-to-one correspondence with the guy pairs and connected to the same position on the node lower chords with the corresponding guy pairs;

two guys in the guy pair are symmetrically connected to two sides of the node lower chord, and the projection of the guys in the vertical direction falls outside the projection of the connected node lower chord in the vertical direction;

the guy cable is connected with the node lower chord in a hinged mode around a rotating shaft arranged horizontally, and the suspension posts are connected with the node lower chord in a hinged mode around the rotating shaft arranged horizontally.

Further, the lower end of the stay cable is connected to the connecting position of the node lower chord member and the web member; the inhaul cable is a prestressed inhaul cable.

Further, the top bearing floor slab, the bottom floor slab and the hanging floor slab are all composed of a steel bar truss floor bearing plate and a concrete layer poured on the steel bar truss floor bearing plate.

Furthermore, the inhaul cable is connected with the lower node chord member through inhaul cable connecting plates, the inhaul cable connecting plates are symmetrically clamped on the left side and the right side of the lower node chord member and are fixedly connected with the clamped lower node chord member, and the lower end of the inhaul cable is hinged with the inhaul cable connecting plates through pin shafts perpendicular to the inhaul cable connecting plates; the projection of the stay cable connecting plate in the vertical direction is positioned outside the projection of the lower chord of the connected node in the vertical direction; each pair of the stay cable connecting plates is called as a clamping pair, the suspension posts are in one-to-one correspondence with the clamping pairs, are arranged below the corresponding clamping pairs, and the upper ends of the suspension posts are hinged with the corresponding clamping pairs around a rotating shaft which is horizontally arranged.

Further, the node lower chord is of a tubular structure, and the position of the node lower chord where the stay cable connecting plate is installed is expanded to be an expanded section for enabling the stay cable connecting plate to be far away from the central axis of the node lower chord; the left side and the right side of the lower chord of the node are provided with avoidance openings for placing the stay cable connecting plates, and the stay cable connecting plates are plugged in the avoidance openings and are fixedly connected with the edges of the avoidance openings.

Furthermore, the suspension posts are connected with the clamping pairs through suspension post connecting plates, the suspension post connecting plates are in one-to-one correspondence with the clamping pairs and are arranged in the middle of the corresponding clamping pairs, the suspension post connecting plates penetrate through the lower chord of the node upwards and then are inserted into the lower chord of the node and are fixedly connected with the lower chord of the node, and the suspension posts are hinged with the suspension post connecting plates at the positions, lower than the bottoms of the lower chord of the node, of the suspension post connecting plates; the suspension posts are of tubular structures, two parallel suspension post inserting plates are arranged at the end part of each suspension post, the upper ends of the two suspension post inserting plates are clamped at two sides of a suspension post connecting plate corresponding to the suspension posts and are hinged with the suspension post connecting plate through pin shafts which vertically penetrate through the suspension post connecting plate and the two suspension post inserting plates; the lower ends of the two suspension post inserting plates penetrate through the pipe wall and are inserted into the end parts of the suspension posts and are in full-welding connection with the suspension posts.

Furthermore, transition stiffening plates for reinforcing the transition positions are arranged at the positions where the stay cable connecting plates are in butt joint with the node lower chord members, the transition stiffening plates are supported in the node lower chord members perpendicular to the node lower chord members, and the edges of the transition stiffening plates are fixedly connected with the inner walls of the node lower chord members and the stay cable connecting plates; and a plurality of connecting stiffening plates for strengthening the connecting strength between the connecting stiffening plate and the lower node chord are arranged between the connecting plate of the suspension post and the inner wall of the lower node chord, and the connecting stiffening plates are respectively and fixedly connected with the connecting plate of the suspension post, the inner wall of the lower node chord and the connecting plate of the stay cable.

Furthermore, the lower chord of the node is a square steel pipe enclosed by a lower chord top plate, a lower chord bottom plate and two lower chord side plates, and the suspension post connecting plate penetrates the lower chord bottom plate upwards and is welded with the lower chord top plate; the lower chord top plate and the lower chord bottom plate are widened at the positions close to the stay cable connecting plate to form an expansion section; the lower chord side plate is bent outwards at a position close to the stay cable connecting plate and then is in butt joint with the stay cable connecting plate, and the inner side of the edge is aligned with the inner side of the edge of the stay cable connecting plate; the surface of the stay cable connecting plate is in full-welding connection with the clamped lower chord top plate and the clamped lower chord bottom plate, and the edge of the stay cable connecting plate is in full-welding connection with the lower chord side plate.

Compared with the prior art, the three-layer overhanging steel structure capable of expanding the available building area has the following beneficial effects:

in the utility model, the stay cables and the suspension posts are connected at the same position of the lower chord of the node, and the stay cables are arranged at two sides of the lower chord of the node in pairs, so that the two problems that the suspension cable structure is not suitable for hanging load and the stay cables are not suitable for crossing other chords are solved, and the cantilever truss with the stay cables and the hanging floor slab is possible; the three-layer overhanging steel structure that a layer of floor slab is respectively paved on the upper surface and the lower surface of the cross-layer truss and a layer of floor slab is hung below the cross-layer truss is adopted, so that the available building area is remarkably enlarged;

in the utility model, no matter the overhanging cross-layer truss or the hanging floor slab hung below the cross-layer truss is adopted, a supporting structure is not required to be arranged right below the overhanging cross-layer truss, extra land occupation is not required, and the limitation caused by land is greatly reduced no matter the newly-built building or the extension of the original building is adopted;

according to the utility model, the stress structure of the three layers of floor slabs is completed at one time, so that the three layers of floor slabs can be constructed at the same time, and the construction period is obviously shortened;

in the utility model, the stay cable pairs (two stay cables which are connected at the same node in pairs) are in one-to-one correspondence with the suspension posts, the stay cable pairs and the corresponding suspension posts are connected at the same node, and the suspension posts are positioned between the stay cable pairs, so that the transmission path of load is greatly simplified, the internal force analysis of the truss which is additionally provided with three layers of extra floors and is also provided with the prestressed stay cables is simplified, and the accurate internal force analysis can be carried out to design a steel structure meeting the requirement; meanwhile, shearing of the lower chord of the node is avoided;

according to the utility model, the guy cable and the suspension post are connected to the node lower chord (the lower chord overlapped with the projection of the upper chord in the vertical direction), so that the cross contact between the suspension post and the rod in the cross-layer truss is avoided, the chance of the cross contact between the guy cable and the rod in the cross-layer truss is reduced, then the guy cables which are possibly in cross contact with the cross-layer truss are connected to two sides of the node lower chord in pairs, the projection of the guy cable in the vertical direction falls outside the projection of the connected node lower chord in the vertical direction, and the cross contact between the guy cable and the rod in the cross-layer truss is avoided; the transmission of force in the inhaul cable and the hanging post is prevented from being influenced, and the rusting caused by contact is avoided;

in the utility model, the left side and the right side of the lower chord of the node are cut with the avoidance openings, and the internal components of the lower chord of the node are plugged by the stay cable connecting plates after being installed, so that various components are allowed to be installed in the lower chord of the node;

in the utility model, the transition stiffening plate is arranged to reinforce the transition position, so that the stress concentration formed at the transition position in the length direction of the lower chord of the node is overcome; the connecting stiffening plate is arranged to reinforce the expansion section, and the connection between the connecting plate of the suspension post and the lower chord of the node is strengthened and plays a role of an inner baffle; the two types of stiffening plates fully overcome various stress concentration problems at the connecting part and avoid instability or fracture of the node;

in the utility model, the inhaul cables are used in pairs, and complex anchorage devices are not needed when prestress tensioning is carried out.

Drawings

FIG. 1 is a schematic structural diagram of a three-layer overhanging steel structure capable of expanding available building area;

FIG. 2 is a schematic structural diagram of a connecting node of a guy cable and a suspension post and a cross-layer truss;

FIG. 3 is a schematic view of the connection between the pulling cable and the pulling cable connecting plate;

FIG. 4 is a schematic view of the connection of the davit connection plate to the remaining components;

FIG. 5 is a schematic view of the connection of a davit insert plate to a davit;

FIG. 6 is a schematic diagram I of the internal structure of a node lower chord;

FIG. 7 is a schematic view of the internal structure of the lower chord of the node;

in the drawings, FIGS. 2-6 are schematic views of a node disposed at an end of a lower chord of the node, and FIG. 7 is a schematic view of a node disposed in a middle of a lower chord of the node;

the steel plate comprises 1-stay cables, 2-node lower chord members, 21-lower chord top plates, 22-lower chord bottom plates, 23-lower chord side plates, 3-web members, 4-hanging columns, 41-hanging column inserting plates, 5-stay cable connecting plates, 6-hanging column connecting plates, 71-transition stiffening plates, 72-connecting stiffening plates, 81-top bearing floors, 82-bottom floors, 83-hanging floors and 9-vertical installation foundations.

Detailed Description

As shown in fig. 1-2, a three-layer overhanging steel structure capable of expanding available building area comprises a plurality of cross-layer trusses, one end of each cross-layer truss is anchored on a vertical installation foundation 9, and the other end of each cross-layer truss is overhung outwards; the truss structure further comprises a top bearing floor 81 laid on the upper chord of the cross-layer truss, a bottom floor 82 laid on the lower chord of the cross-layer truss, a hanging floor 83 hung below the cross-layer truss through a hanging column 4, and a guy cable 1 of which the lower end is connected to the cross-layer truss and the upper end is connected to the vertical installation foundation 9 in an inclined mode. In this embodiment, the vertical installation foundation 9 is a column, and the upper end of the stay cable 1 is connected to the connection position of the upper chord and the column of the cross-layer truss.

The vertical installation foundation 9 can be a column or a wall, but it should be noted that the vertical installation foundation 9 can bear large bending moment in the use process, so the bending strength of the vertical installation foundation is required to reach the standard, and if the column is adopted, the column base is a rigid connection column base. In addition, bending moments of the cantilever steel structures can be offset by symmetrically arranging the cantilever steel structures.

Among the lower chords of the cross-layer truss, the lower chords overlapped with the projection of the upper chords in the vertical direction are marked as node lower chords 2, the inhaul cables 1 are combined pairwise to form inhaul cable 1 pairs, and the suspension posts 4 are arranged in one-to-one correspondence with the inhaul cables 1 pairs and connected to the same position on the node lower chords 2 with the corresponding inhaul cable 1 pairs. Guy cable 1 and davit 4 need be connected on same node, and this node can be located the lower chord and also can be located the upper chord, but if set up at the upper chord, then let davit 4 not have the difficulty with the pole cross contact in the cross-layer truss, and davit 4 need pierce through the bottom floor.

The cross-layer truss can adopt a box-type truss or a plane truss, and the guy cable 1 can be connected to any position including the end part on the lower chord 2 of the node. The span of the floor in this embodiment is not big, and the span truss adopts the box truss that has four chords that form the matrix and arrange, and the end of encorbelmenting at node lower chord 2 is connected to cable 1. Of course, if a larger span is required, more cables 1 should be provided, instead of providing cables 1 only at the overhanging end.

As shown in fig. 3, two cables 1 in a pair of cables 1 are symmetrically connected to two sides of a node lower chord 2, and the projection of the cable 1 in the vertical direction falls outside the projection of the connected node lower chord 2 in the vertical direction.

For the cross-layer truss, because the web members 3 are thinner than the chords, as long as the upper chord member is vertically aligned with the lower chord member, the web members 3 also tend to fall into the vertical projection of the upper chord member and the lower chord member, so that the guy cable 1 keeps a certain distance from the chords, and the guy cable 1 also tends not to touch the web members 3. Of course, if the web member 3 is thicker than the chord member, the cable 1 needs to be moved outward a little more so as not to cross the web member 3.

The stay cable 1 is hinged with the node lower chord 2 around a rotating shaft which is horizontally arranged; the suspension posts 4 are hinged with the node lower chord 2 around a rotating shaft arranged horizontally, and the hinged connection is required to avoid stress concentration formed on the node lower chord 2 by the bending moment of the suspension posts 4.

In the embodiment, the stay 1 is a prestressed stay; the lower end of the inhaul cable 1 is connected with the connecting position of the node lower chord 2 and the web member 3, so that the force borne by the node can be better distributed in the whole cross-layer truss.

The top bearing floor 81, the bottom floor 82 and the hanging floor 83 are all composed of steel bar truss floor bearing plates and concrete layers poured on the steel bar truss floor bearing plates. By adopting the steel bar truss floor bearing plate, the template can be saved. The hanging floor 83 should be fixed under the condition of site operation to reduce the shaking of the hanging floor in the using process, for example, the edge is fixed on the vertical installation foundation 9, which is not described in detail.

In this embodiment, the top floor 81 is provided as an additional floor, which needs to support people and equipment, and if there is no need, a thin plate can be laid instead.

The stay cable 1 is connected with the node lower chord 2 through a stay cable connecting plate 5, the stay cable connecting plate 5 is symmetrically clamped at the left side and the right side of the node lower chord 2 and is fixedly connected with the clamped node lower chord 2, and the lower end of the stay cable 1 is hinged with the stay cable connecting plate 5 through a pin shaft perpendicular to the stay cable connecting plate 5; the projection of the stay cable connecting plate 5 in the vertical direction is positioned outside the projection of the lower chord 2 of the connected node in the vertical direction; that is, the stay 1 is kept away from the chord by moving the stay connecting plate 5 outward. Each pair of the inhaul cable connecting plates 5 is called a clamping pair, the suspension posts 4 correspond to the clamping pairs one by one, are arranged below the corresponding clamping pairs, and are hinged and connected with the corresponding clamping pairs at the upper ends around a rotating shaft which is horizontally arranged.

The node lower chord 2 is of a tubular structure, and the position of the node lower chord 2 where the stay cable connecting plate 5 is installed is expanded to be an expanded section for enabling the stay cable connecting plate 5 to be far away from the central axis of the node lower chord 2; generally speaking, when the lower chord 2 of the node is a square steel pipe, the requirement can be met by widening a little, and when the lower chord 2 of the node is a square steel pipe, the diameter of the expansion section can be enlarged a little. The left side and the right side of the lower node chord 2 are provided with avoiding openings for placing the stay cable connecting plates 5, and the stay cable connecting plates 5 are plugged in the avoiding openings and fixedly connected with the edges of the avoiding openings. Since a series of parts are also arranged in the node lower chord 2, a position-avoiding opening needs to be cut in the node lower chord 2, and after the internal accessories are installed, the cable connecting plate 5 needs to be filled. Meanwhile, the wall thickness of the node lower chord 2 is not enough to bear the pulling force of the cable 1, so that a thicker cable connecting plate 5 is needed to replace the part of the node lower chord 2 directly connected with the cable 1.

As shown in fig. 4-5, the suspension posts 4 are connected with the clamping pairs through suspension post connecting plates 6, the suspension post connecting plates 6 are in one-to-one correspondence with the clamping pairs and are arranged in the middle of the corresponding clamping pairs, the suspension post connecting plates 6 penetrate the node lower chord 2 upwards and then are inserted into the node lower chord 2 and are fixedly connected with the node lower chord 2, and the suspension posts 4 are hinged with the suspension post connecting plates 6 at positions where the suspension post connecting plates 6 are lower than the bottom of the node lower chord 2; the effect of davit connecting plate 6 is that the interval that makes davit 4 from two cable 1 is unanimous, avoids causing on the load can not effectively transmit cable 1 because of the interval is inconsistent. Directly connecting the suspension posts 4 to the cable connecting plate 5 is not easy to grasp the spacing, and is also easy to interfere with the installation of the rest of the components in the node lower chord 2.

The suspension posts 4 are round steel tubes, two parallel suspension post inserting plates 41 are arranged at the end part of each suspension post 4, the upper ends of the two suspension post inserting plates 41 are clamped at the two sides of a suspension post connecting plate 6 corresponding to the suspension posts 4 and are hinged with the suspension post connecting plate 6 through pin shafts which vertically penetrate through the suspension post connecting plate 6 and the two suspension post inserting plates 41; the lower ends of the two suspension post inserting plates 41 penetrate through the pipe wall and are inserted into the end part of the suspension post 4 and are in full-welding connection with the suspension post 4. If the suspension post connecting plate 6 is directly inserted into the upper end of the suspension post 4 and fixed by the pin shaft, the suspension post 4 is of a tubular structure, the connection strength of the hinged joint is not enough and is not beneficial to assembly, so that two suspension post inserting plates 41 are arranged, and the suspension post inserting plates 41 are firstly welded with the suspension post 4 and then clamped on two sides of the suspension post connecting plate 6.

As shown in fig. 6, transition stiffening plates 71 for reinforcing the transition position are arranged at the butt joint positions of the guy cable connecting plates 5 and the node lower chords 2, the transition stiffening plates 71 are supported in the node lower chords 2 perpendicular to the node lower chords 2, and the edges of the transition stiffening plates are fixedly connected with the inner walls of the node lower chords 2 and the guy cable connecting plates 5; a plurality of connecting stiffening plates 72 for strengthening the connecting strength between the connecting stiffening plate 72 and the lower node chord 2 are also arranged between the connecting plate 6 of the suspension post and the inner wall of the lower node chord 2, and the connecting stiffening plates 72 are respectively and fixedly connected with the connecting plate 6 of the suspension post, the inner wall of the lower node chord 2 and the connecting plate 5 of the inhaul cable.

Fig. 6 shows the structure inside the node lower chord 2 when the guy 1 is connected to the end of the node lower chord 2, and if the guy is connected to a part other than the end, the distribution of the stiffening plates is as shown in fig. 7.

In the embodiment, the node lower chord 2 is a square steel pipe enclosed by a lower chord top plate 21, a lower chord bottom plate 22 and two lower chord side plates 23, and the suspension strut connecting plate 6 penetrates the lower chord bottom plate 22 upwards and is welded with the lower chord top plate 21; the lower chord top plate 21 and the lower chord bottom plate 22 are widened at the positions close to the inhaul cable connecting plate 5 to form an expansion section; the lower chord side plate 23 is bent outwards at a position close to the inhaul cable connecting plate 5 and then is in butt joint with the inhaul cable connecting plate 5, and the inner side of the edge is aligned with the inner side of the edge of the inhaul cable connecting plate 5; the plate surface of the guy cable connecting plate 5 is in full-welding connection with the clamped lower chord top plate 21 and the clamped lower chord bottom plate 22, and the edge of the guy cable connecting plate 5 is in full-welding connection with the lower chord side plate 23.

Of course, the connection method of the present invention may be adopted when the node lower chord 2 is a circular steel tube, but it is difficult to install the components inside the node lower chord 2.

A construction method of a three-layer overhanging steel structure capable of expanding available building area is used for the construction of the three-layer overhanging steel structure capable of expanding available building area and comprises the following steps:

the method comprises the following steps: assembling the cross-layer truss, and simultaneously installing the guy cable connecting plate 5, the suspension column connecting plate 6, the transition stiffening plate 71 and the connecting stiffening plate 72 on the node lower chord 2; for the node lower chord 2 in the present embodiment, the specific manner is as follows:

cutting off the lower chord side plate 23 at the position of the guy cable connecting plate 5, separating the lower chord side plate 23 close to the cut position from the lower chord top plate 21 and the lower chord bottom plate 22, and bending the lower chord side plate 23 at the separated part outwards;

installing a transition stiffening plate 71 at the notch position of the lower chord side plate 23, and enabling the transition stiffening plate to be in full-welding connection with the lower surface of the lower chord top plate 21, the upper surface of the lower chord bottom plate 22 and the notch of the lower chord side plate 23;

an opening is formed in the bottom plate 22 of the lower chord, the suspension post connecting plate 6 is inserted, and the upper end of the suspension post connecting plate 6 is welded to the bottom of the top plate 21 of the lower chord;

the left side and the right side of the hanging column connecting plate 6 are welded and connected with stiffening plates 72;

installing a guy cable connecting plate 5, and enabling the guy cable connecting plate to be in full-welding connection with the notch of the lower chord side plate 23, the transition stiffening plate 71 and the connecting stiffening plate 72;

the outer side plate surface of the lower chord top plate 21 and the outer side plate surface of the lower chord bottom plate 22 of the expansion section are attached by horizontally arranged steel plates, so that the node lower chord 2 is closed, and the steel plates are in full-weld connection with the attached lower chord top plate 21 or lower chord bottom plate 22 and are in full-weld connection with the inhaul cable connecting plates 5 on two sides;

after this is done, the suspension post insert plate 41 is mounted on the suspension post 4, i.e. the preparation of the material is completed.

Step two: building a temporary support, moving the cross-layer truss to the temporary support, and connecting the cross-layer truss with the vertical installation foundation 9 on the temporary support; the mode of integral hoisting, in-situ lifting or sliding can be adopted, and the mode is selected according to the conditions of a construction site.

Step three: install cable 1 on vertical installation basis 9, then link the cable 1 lower extreme on corresponding cable connecting plate 5 with the round pin axle.

Step four: applying pretightening force on the inhaul cable 1, primarily tensioning the inhaul cable to the position below the cross-layer truss, and removing the temporary support after the temporary support is not stressed; note that, it should be considered that, after various accessory components are subsequently installed on the cross-layer truss, the guy cable 1 is elongated, so that the end of the cross-layer truss is bent downward, and therefore, these factors should be taken into consideration when the guy cable 1 is pre-tightened to ensure that the position and posture of the cross-layer truss meet the requirements after the construction is completed.

Step five: the suspension posts 4 with the suspension post inserting plates 41 are arranged on the corresponding suspension post connecting plates 6 by pin shafts.

Step six: after the top bearing floor 81, the bottom floor 82, and the hanging floor 83 are installed, the stay cable 1 is tensioned to 100%. Note that there is no direct connection between the top bearing floor 81, the bottom floor 82, and the hanging floor 83, and there is no problem of vertical crossing construction because the steel bar truss floor deck adopted in this embodiment completely separates three floors. The three floors are not interfered with each other during construction, concrete of the three floors can be poured simultaneously to shorten the construction period, the construction sequence can be freely adjusted according to construction requirements, and any one or three of the three floors can be freely selected to be constructed according to the construction requirements as long as the stay cable 1 is installed.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims (8)

1. A three-layer overhanging steel structure capable of expanding available building area comprises a plurality of cross-layer trusses, one ends of which are anchored on a vertical installation foundation (9), and the other ends of which are overhung outwards; the method is characterized in that: the floor structure further comprises a top bearing floor (81) laid on the upper chord of the cross-layer truss, a bottom floor (82) laid on the lower chord of the cross-layer truss, a hanging floor (83) hung below the cross-layer truss through a hanging column (4), and a guy cable (1) of which the lower end is connected to the cross-layer truss and the upper end is connected to the vertical installation foundation (9) in an inclined upward manner;

among the lower chords of the cross-layer truss, the lower chords overlapped with the projection of the upper chords in the vertical direction are marked as node lower chords (2), the guys (1) are combined pairwise to form guy cable (1) pairs, and the suspension posts (4) are arranged in one-to-one correspondence with the guys (1) and are connected to the same position on the node lower chords (2) in correspondence with the corresponding guy cable (1) pairs;

two guys (1) in the guy (1) pair are symmetrically connected to two sides of the node lower chord (2), and the projection of the guys (1) in the vertical direction is outside the projection of the connected node lower chord (2) in the vertical direction;

stay cable (1) and node lower chord (2) are connected around the axis of rotation articulated that the level set up, davit (4) are connected around the axis of rotation articulated that the level set up with node lower chord (2).

2. The three-layer overhanging steel structure capable of expanding available building area according to claim 1, is characterized in that: the top bearing floor (81), the bottom floor (82) and the hanging floor (83) are all composed of steel bar truss floor bearing plates and concrete layers poured on the steel bar truss floor bearing plates.

3. The three-layer overhanging steel structure capable of expanding available building area according to claim 1, is characterized in that: the stay cable (1) is connected with the node lower chord (2) through a stay cable connecting plate (5), the stay cable connecting plate (5) is symmetrically clamped at the left side and the right side of the node lower chord (2) and is fixedly connected with the clamped node lower chord (2), and the lower end of the stay cable (1) is hinged with the stay cable connecting plate (5) through a pin shaft perpendicular to the stay cable connecting plate (5); the projection of the stay cable connecting plate (5) in the vertical direction is outside the projection of the lower chord (2) of the connected node in the vertical direction; each pair of the inhaul cable connecting plates (5) is called as a clamping pair, the suspension posts (4) correspond to the clamping pairs one by one, are arranged below the corresponding clamping pairs, and are hinged and connected with the corresponding clamping pairs at the upper ends around a rotating shaft which is horizontally arranged.

4. A three-layer overhanging steel structure capable of expanding available construction area according to claim 3, characterized in that: the node lower chord (2) is of a tubular structure, and the position of the node lower chord (2) where the stay cable connecting plate (5) is installed is expanded to be an expanded section for enabling the stay cable connecting plate (5) to be far away from the central axis of the node lower chord (2); the left side and the right side of the lower chord (2) of the node are provided with avoiding openings for placing the stay cable connecting plates (5), and the stay cable connecting plates (5) are blocked in the avoiding openings and are fixedly connected with the edges of the avoiding openings.

5. The three-layer overhanging steel structure capable of expanding available building area according to claim 4, is characterized in that: the suspension posts (4) are connected with the clamping pairs through suspension post connecting plates (6), the suspension post connecting plates (6) correspond to the clamping pairs one to one and are arranged in the middle of the corresponding clamping pairs, the suspension post connecting plates (6) upwards penetrate through the lower node chord (2) and then are inserted into the lower node chord (2) and are fixedly connected with the lower node chord (2), and the suspension posts are connected with the lower node chord (2) in a penetrating mode

The column is hinged with the hanging column connecting plate (6) at the position where the hanging column connecting plate (6) is lower than the bottom of the node lower chord (2); the suspension posts (4) are of a tubular structure, two parallel suspension post inserting plates (41) are arranged at the end part of each suspension post (4), the upper ends of the two suspension post inserting plates (41) are clamped at two sides of a suspension post connecting plate (6) corresponding to the suspension posts (4) and are hinged with the suspension post connecting plate (6) through pin shafts which vertically penetrate through the suspension post connecting plate (6) and the two suspension post inserting plates (41); the lower ends of the two suspension post inserting plates (41) penetrate through the pipe wall and are inserted into the end part of the suspension post (4) and are in full-welding connection with the suspension post (4).

6. The three-layer overhanging steel structure capable of expanding available building area according to claim 5, is characterized in that: transition stiffening plates (71) for reinforcing the transition positions are arranged at the butt joint positions of the guy cable connecting plates (5) and the node lower chords (2), the transition stiffening plates (71) are perpendicular to the node lower chords (2) and supported in the node lower chords (2), and the edges of the transition stiffening plates are fixedly connected with the inner walls of the node lower chords (2) and the guy cable connecting plates (5); a plurality of connecting stiffening plates (72) used for strengthening the connecting strength between the connecting stiffening plate (72) and the lower node chord (2) are further arranged between the hanging column connecting plate (6) and the inner wall of the lower node chord (2), and the connecting stiffening plates (72) are respectively and fixedly connected with the hanging column connecting plate (6), the inner wall of the lower node chord (2) and the bracing cable connecting plate (5).

7. The three-layer overhanging steel structure capable of expanding available building area according to claim 6, is characterized in that: the node lower chord (2) is a square steel pipe formed by enclosing a lower chord top plate (21), a lower chord bottom plate (22) and two lower chord side plates (23), and the suspension column connecting plate (6) penetrates through the lower chord bottom plate (22) upwards and is then welded with the lower chord top plate (21); the lower chord top plate (21) and the lower chord bottom plate (22) are widened at the position attached to the inhaul cable connecting plate (5) to form an expansion section; the lower chord side plate (23) is bent outwards at a position close to the inhaul cable connecting plate (5) and then is in butt joint with the inhaul cable connecting plate (5), and the inner side of the edge is aligned with the inner side of the edge of the inhaul cable connecting plate (5); the surface of the guy cable connecting plate (5) is in full-welding connection with the clamped lower chord top plate (21) and the clamped lower chord bottom plate (22), and the edge of the guy cable connecting plate (5) is in full-welding connection with the lower chord side plate (23).

8. The three-layer overhanging steel structure capable of expanding available building area according to claim 7, is characterized in that: the lower end of the inhaul cable (1) is connected to the connecting position of the node lower chord (2) and the web member (3); the inhaul cable (1) is a prestressed inhaul cable.

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