CN218060946U - Special-shaped plane double-overhanging narrow-flange variable-section steel framework roof - Google Patents

Abstract

The utility model relates to a narrow-flange variable-section steel frame roof with special-shaped plane double cantilever, comprising: a core support frame, a vertical support steel column, a horizontal lateral support bar and a base pier at the bottom; the core support frame passes through The box-shaped transfer node at the top of the steel column is supported on multiple vertical supporting steel columns; the core support frame is composed of the main steel beam in the middle and the main steel beam with double cantilever on both sides; Between the steel beams, it serves as the lateral supporting steel member of the main steel beams with double cantilever on both sides. The beneficial effects of the utility model are: the special-shaped plane double cantilever narrow-flange variable-section steel frame roof provided by the utility model has a reasonable structural system structure, a large space at the bottom, and large overhangs (narrow wings) on both sides. The maximum steel girder cantilever span on both sides of the edge-variable section steel frame roof is not less than 10m), which can give full play to the advantages of high lateral stiffness and narrow-flange variable-section dense grid.

Description

Narrow-flange variable-section steel frame roof with special-shaped plane and double cantilever

technical field

The utility model belongs to the technical field of structural engineering, in particular to a special-shaped plane double-cantilever steel frame roof with narrow flange and variable cross-section.

Background technique

The long-span steel frame roof structure is a large-space roof structure system composed of steel beams and steel columns, which has the advantages of light weight, large span, and large lateral and torsional rigidity. This structural system is widely used in roof steel frame buildings with commercial and office functions.

When there is a large space requirement at the bottom of the long-span steel frame roof structure, it is a more reasonable and effective solution to set up two-way large cantilever steel beam members to realize the large space function at the bottom under the arrangement of fewer columns. In order to reduce the self-weight of the roof structure and make full use of the mechanical properties of steel members, a reasonable and effective form setting of variable cross-sections for large cantilever steel beam members is also an important factor for realizing the stress of the overall structural system.

The erection of large cantilevered steel frame roofs often needs to be realized by arranging dense steel beam members; narrow flange section members are a more reasonable and effective solution for small-spacing steel beam arrangement structural systems; at the same time, the lateral support It is also very important to ensure the overall lateral and torsional rigidity performance of the large cantilever steel frame roof structure. Therefore, reasonable and effective narrow flange section selection and lateral support arrangement are an important factor to realize the mechanical performance of the overall structural system and ensure the lateral and torsional rigidity performance.

The vertical support of the long-span steel frame roof is also an important aspect; in order to realize the building function of the large space, the cross-section selection and layout of the small-section steel column members and the connection method of the reinforced nodes at the conversion nodes are to ensure the appearance of the building. An important factor in achieving efficient vertical load support transitions while being graceful. The diversification of special-shaped plane forms can effectively meet the needs of different building plane functions and shapes. Reasonable and effective special-shaped plane layout forms and corner realization schemes are also important factors to ensure the mechanical performance of the overall structural system.

In addition, the long-span steel frame roof structure system has problems such as complex node connection structure, complex component composition, load-bearing performance and stiffness, etc. Reasonable and effective form design and composition The scheme is also an important factor to ensure its bearing performance and normal use.

To sum up, a special-shaped planar double-overhang narrow-flange variable-section steel frame roof structure is studied, so as to be suitable for the planar special-shaped combined building shape steel frame roof structure with large space at the bottom and large overhangs on both sides. System design and bearing are very necessary.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art and provide a special-shaped plane double-cantilever steel frame roof with narrow flange and variable cross-section.

This special-shaped planar double-overhang narrow-flange variable-section steel frame roof includes: core support frame, vertical support steel column, horizontal lateral support bar and base pier at the bottom; the core support frame passes through the steel column top The box-type transfer node is supported on multiple vertical supporting steel columns; the core supporting structure is composed of the main steel beam in the middle and the double cantilevered main steel beams on both sides; the horizontal lateral braces are located between the double cantilevered main steel beams on both sides , as the lateral supporting steel member of the main steel girder with double cantilever on both sides, and at the same time strengthen the torsional rigidity of the overall structural system; the horizontal lateral bracing includes the first horizontal lateral bracing and the second horizontal lateral bracing ;The pier of the bottom base is located at the bottom of the vertical supporting steel column, and is composed of the lower pier section of the bottom base and the upper enlarged section of the bottom base;

The main steel girder in the middle is located on the top of several vertical supporting steel columns. The two ends of the frame beam, the orthogonal steel frame beam and the angle steel frame beam are rigidly connected to the top of the vertical supporting steel column; the two ends of the span steel secondary beam are rigidly connected to the orthogonal steel frame Beams or oblique steel frame beams at corners; the main steel beam in the middle is an internal special-shaped plane as a whole;

The main steel girders with double cantilever on both sides are located outside the top sides of multiple vertical supporting steel columns; Cross direction cantilevered steel frame girder, corner cantilevered obliquely cantilevered steel frame girder, span direction cantilevered steel secondary beam 1, span direction cantilevered steel secondary beam 2 and orthogonal direction cantilevered steel secondary beam; double cantilevered main beam on both sides The whole steel beam is an external annular special-shaped plane; the cantilevered steel frame beams cantilevered in the first span direction, the second cantilevered steel frame beam in the span direction, the cantilevered steel frame beam in the orthogonal direction and the obliquely cantilevered steel frame beam in the corner Connected to the top of the vertical supporting steel column, the cantilevered end of the span cantilevered steel frame beam 1, the span cantilevered steel frame beam 2, the orthogonal cantilevered steel frame beam and the corner obliquely cantilevered steel frame beam The part is in the state of free suspension; the cantilever roots of span-direction cantilever steel secondary beam 1, span-direction cantilever steel secondary beam 2 and orthogonal direction cantilever steel secondary beam are rigidly connected to span-direction steel frame beam and orthogonal direction On steel frame girders or obliquely cantilevered steel frame girders at corners, the cantilevered ends of span-directed cantilevered steel secondary beams 1, span-directed cantilevered steel secondary beams 2, and orthogonally cantilevered steel secondary beams are in a free-hanging state .

Preferably, the internal special-shaped plane formed by the main steel beam in the middle is L-shaped, T-shaped, U-shaped, Z-shaped, I-shaped, cross-shaped or back-shaped plane; the internal special-shaped plane adopts a corner inclined steel frame beam as the corner The plane turning at the plane turning, the turning angle of the plane turning is 30°～120°, and the turning angle of the plane turning is 90°, which is the simplest form and the most widely used; L-shaped, T-shaped, U-shaped, Z-shaped, I-shaped, cross-shaped or back-shaped planes; the outer circular special-shaped plane layout corners are inclined to the steel frame beam to realize the plane turning at the corner, and the corner of the plane turning is 30° °～120°, the corner at the turning point of the plane is 90°, the form is the simplest and the most versatile; the outer circular special-shaped plane corresponds to the corner and special-shaped form of the inner special-shaped plane.

Preferably, the internal special-shaped plane and the external annular special-shaped plane together form a special-shaped plane frame, and the special-shaped plane frame includes an L-shaped plane steel frame, a T-shaped plane steel frame, a U-shaped plane steel frame, a Z-shaped plane steel frame, and an I-shaped plane. The steel frame, the cross-shaped planar steel frame and the back-shaped planar steel frame are all special-shaped planar combinations with multiple corners.

Preferably, the vertical supporting steel column is located below the central main steel beam, and is a cross-shaped steel member; the connection between the vertical supporting steel column and the central main steel beam is a box-shaped or H-shaped section, and the box-shaped or H-shaped section passes through the vertical The box-shaped transfer node at the top of the supporting steel column is rigidly connected to the end of the main steel beam in the middle for vertical support; the box-shaped transfer form can fully realize the rigid connection of the beam-column components, and strengthen the rigidity and strength of the connection node; The lateral struts are circular steel pipe members, and the horizontal lateral struts are vertically offset downwards and arranged at multiple intervals. The first horizontal lateral strut and the second horizontal lateral strut are both circular steel pipe members with a cross-sectional diameter of 100mm-200mm; the base pier at the bottom is a T-shaped pier with a height of 600mm-1500mm platform, to provide sufficient anchoring length for anchor bolts. In order to improve the anchoring effect, anchor bolts can also be anchored to concrete frame columns, frame beams or shear wall corner column members below the pier of the bottom base; as vertical supporting steel columns The exposed rigid column foot anchors the foundation.

Preferably, the internal cross partition of the cross-shaped steel member vertically supporting the steel column extends to the top of the box-shaped conversion node, and serves as a vertical reinforcement partition inside the box-shaped conversion node at the top of the vertical support steel column for node reinforcement.

As a preference, the main steel girders with double cantilever on both sides are independent cantilever beams on both sides, and the main steel girder in the middle is arranged in one-to-one correspondence with the main steel girders with double cantilever on both sides; It is composed of constant section at the root of the cantilever beam and variable section at the end of the cantilever beam; the first horizontal lateral strut is located at the junction of the constant section at the root of the double cantilever main steel beam on both sides and the variable section at the end; the second The two horizontal lateral struts are located in the middle of the variable section section at the end.

Preferably, the rigid connection is a bolted connection or a welded connection; the exposed rigid column foot height foundation is used for rigid connection between the bottom base pier and the vertical support steel column; each vertical support steel column bottom is provided with a rigid The column base node is rigidly connected to the base pier at the bottom; the section side length of the vertically supporting steel column is 400mm-800mm.

As preferred:

In the main steel beam in the middle, the span direction span and the orthogonal direction span between two adjacent vertical supporting steel columns are both 7m~10m;

The distance between the main steel girders in the middle is 1m~3m; the section type of the main steel beams in the middle is box section or H section, the section height is 800mm~1500mm, and the section width is 150~250mm; stiffening plates are arranged on both sides of the H section , the distance between stiffening plates is 800mm～1500mm;

In the double cantilevered main steel girders on both sides, the cantilevered spans of the cantilevered steel frame beam 1, the cantilevered steel frame beam 2 and the orthogonal cantilevered steel frame beam are 10m to 15m;

The distance between the double cantilevered main steel beams on both sides is 1m~3m; the section type of the double cantilevered main steel beams on both sides is H-shaped section or box-shaped section, the root is in the form of equal section, and the section height of the root is the same as that of the central main steel beam. Both are 800mm-1500mm; the ends of the double-cantilevered main steel beams on both sides are in the form of variable cross-section, and the cross-section width changes gradually from the root to the end. The width is 150-250mm; stiffening plates are arranged on both sides of the H-shaped section, and the distance between the stiffening plates is 800mm-1500mm.

As a preference, the span steel frame beam, the orthogonal steel frame beam, the angled steel frame beam and the span steel secondary beam are steel beam members with narrow flanges and equal sections rigidly connected at both ends; the span steel frame cantilevered Beam 1, cantilevered steel frame beam 2 in the span direction, cantilevered steel frame beam in the orthogonal direction, cantilevered steel frame beam in the oblique direction at the corner, cantilevered steel secondary beam 1 in the span direction, cantilevered steel secondary beam 2 in the span direction and orthogonal The cantilevered steel secondary beams are steel beam members with narrow flange and variable cross-section rigidly connected at the cantilever root.

The beneficial effects of the utility model are:

1. The special-shaped planar double cantilever narrow-flange variable-section steel frame roof provided by the utility model has a reasonable structural system structure, a large space at the bottom, and large overhangs on both sides (narrow-flange variable-section steel frame roof The cantilevered span of the largest steel beams on both sides of the cover is not less than 10m), which can give full play to the advantages of high lateral rigidity and narrow flange with variable cross-section and dense grid.

2. The utility model combines the central main steel beam with the double cantilevered main steel beams on both sides as a large-span double cantilevered core support structure; the horizontal lateral support of the double cantilevered main steel beams on both sides Support; vertical support is provided by vertical supporting steel columns; the arrangement of double cantilevered main steel beams with narrow flanges and small spacing on both sides can realize large space at the bottom and large space on both sides while reducing its own weight and ensuring load-bearing performance. The shape and function of the planar special-shaped combined steel frame roof building with cantilever, high lateral stiffness and narrow flange with variable cross-section and dense grid.

3. The component modules of the narrow-flange variable-section steel frame roof structure with special-shaped plane double overhangs of the present utility model are clear. The special-shaped plane combined architectural shape steel frame roof structure system with large space at the bottom and large overhangs on both sides has broad application prospects.

Description of drawings

Figure 1-1 is a schematic diagram of the overall structure of a narrow-flange variable-section steel frame roof;

Figure 1-2 is a schematic diagram of the central main steel girder of the narrow-flange variable-section steel frame roof;

Figure 1-3 is a schematic diagram of double cantilevered main steel beams on both sides of the narrow-flange variable-section steel frame roof;

Figure 1-4 is a schematic diagram of the vertical support steel columns of the narrow-flange variable-section steel frame roof;

Figure 1-5 is a schematic diagram of the horizontal lateral struts of the narrow-flange variable-section steel frame roof;

Figure 1-6 is a schematic diagram of the bottom base pier of the steel frame roof with narrow flange variable section;

Figure 2 is a schematic diagram of A-A section in Figure 1-1;

Figure 3 is a schematic diagram of the B-B section in Figure 1-1;

Figure 4 is a schematic cross-sectional view of C-C in Figure 1-1;

Figure 5-1 is a schematic diagram of the L-shaped plan of the narrow-flange variable-section steel frame roof;

Figure 5-2 is a T-shaped plan view of a narrow-flange variable-section steel frame roof;

Figure 5-3 is a U-shaped plan view of a narrow-flange variable-section steel frame roof;

Figure 5-4 is a Z-shaped schematic diagram of a narrow-flange variable-section steel frame roof;

Figure 5-5 is a schematic diagram of the I-type plan of the narrow-flange variable-section steel frame roof;

Figure 5-6 is a cross-shaped schematic plan view of a narrow-flange variable-section steel frame roof;

Figure 5-7 is a schematic plan view of a back-shaped steel frame roof with narrow flange variable section;

Figure 6-1 is a side view of the C-C section of the single large span double cantilever main steel girder in Figure 2;

Figure 6-2 is a side view of the D-D section of the main steel girder with a 45° oblique side and a single large-span double-cantilever in Figure 2;

Fig. 7 is a schematic diagram of the beam-to-column rigid connection connection node of the narrow-flange variable-section steel frame roof in Fig. 1-1;

Fig. 8 is a large sample diagram of the structure of the rigid column foot node at the bottom of the steel column;

Fig. 9 is a flow chart of component assembly of the steel frame roof with narrow flange and variable cross-section of the present invention.

Explanation of reference signs: 1-span steel frame beam; 2-orthogonal steel frame beam; 3-angle oblique steel frame beam; 4-span steel secondary beam; 5-span cantilevered steel frame beam one; 6-Span direction cantilevered steel frame beam II; 7-Orthogonal direction cantilevered steel frame beam; 8-Corner obliquely cantilevered steel frame beam; 9-Span direction cantilevered steel secondary beam I; 10-Span direction cantilevered Steel secondary beam 2; 11-Orthogonal cantilevered steel secondary beam; 12-Equal cross-section at the root of the cantilever beam; 13-Variable cross-section at the end of the cantilever beam; 14-Vertical supporting steel column; 15-Steel Box-shaped transfer node at the top of the column; 16-rigid column foot node at the bottom of the steel column; 17-the first horizontal lateral strut; 18-the second horizontal lateral strut; 19-the lower pier of the bottom base section; 20-the upper enlarged section of the bottom base; 21-L-shaped plane steel frame; 22-T-shaped plane steel frame; 23-U-shaped plane steel frame; 24-Z-shaped plane steel frame; 25-I-shaped plane steel frame Frame; 26-cross-shaped plane steel frame; 27-back-shaped plane steel frame.

detailed description

Below in conjunction with embodiment the utility model is described further. The description of the following embodiments is only used to help understand the utility model. It should be pointed out that for those skilled in the art, without departing from the principle of the utility model, some modifications can also be made to the utility model, and these improvements and modifications also fall within the protection scope of the claims of the utility model.

Embodiment one

As shown in Figure 1-1 to Figure 1-6, Figure 2, Figure 3 and Figure 4, the narrow-flange variable-section steel frame roof structure with special-shaped plane double cantilever includes the main steel beam in the middle, double Cantilevered main steel beams, vertical supporting steel columns, horizontal lateral struts, and base pier at the bottom; the central main steel beam (Figure 1-2) is located between the vertical supporting steel columns in the middle, connected The steel frame beam supporting the steel column and the steel secondary beam connected to the steel frame beam are all steel beam members with narrow flanges and equal sections rigidly connected at both ends; the main steel beam with double cantilever on both sides (Fig. 1-3 ) outside the vertical supporting steel columns on both sides, including the cantilevered steel frame beams connected to the vertical supporting steel columns and the cantilevered steel secondary beams connected Cross-section steel beam members are arranged in one-to-one correspondence with the main steel beam in the middle and together constitute the core support structure; the vertical supporting steel column (Fig. 1-4) is located below the main steel beam in the middle and is a cross-shaped steel member. The connection of the main steel beam is converted into a box section for vertical support; the horizontal lateral struts (Figure 1-5) are located between the double cantilevered main steel beams on both sides, and are circular steel pipe members, vertically downward Offset multi-row arrangement, both ends are hinged to connect the webs of double cantilevered main steel beams on both sides to provide horizontal lateral support; the bottom base pier (Fig. 1-6) is located The bottom is a T-shaped pier platform with a certain height, which serves as the anchor foundation for the exposed rigid column foot of the vertical support steel column.

The main steel girder in the middle is located between the vertical supporting steel columns 14 in the middle, including span-oriented steel frame beam 1, orthogonal steel frame beam 2, corner oblique steel frame beam 3 and span-oriented steel secondary beam 4, which together form the interior shaped floor plan. The two ends of the span steel frame beam 1, the orthogonal steel frame beam 2 and the angle steel frame beam 3 are rigidly connected to the top of the vertical supporting steel column 14, and the two ends of the span steel secondary beam 4 are rigidly connected. directly connected to the orthogonal steel frame beam 2 or the corner inclined steel frame beam 3.

As shown in Figure 1-2, Figure 2 to Figure 4, and Figure 5-1 to Figure 5-7, the internal special-shaped plane layout realizes the plane turning at the corner by tilting the corner to the steel frame beam 3, and the corner at the plane turning 30°～120°, and the right-angle corner form with a 90° corner is the simplest and most versatile; the internal special-shaped plane forms include L-shaped, T-shaped, U-shaped, Z-shaped, I-shaped, cross-shaped and back-shaped. It is a multi-cornered special-shaped plane combination type. In this embodiment, the internal special-shaped plane is L-shaped, and the corner of the plane is 90°.

As shown in Fig. 1-2, Fig. 2, Fig. 6-1 and Fig. 6-2, the main steel girder in the middle is a steel beam member with narrow flange and equal section rigidly connected at both ends, and the vertical supporting steel columns 14 are The span in the span direction and the perpendicular direction are 7m~10m; the distance between the main steel girders in the middle is 1m~3m, the section type is H section or box section, the section height is 800mm~1500mm, and the section width is 150~250mm; H Stiffeners are arranged on both sides of the profile section, and the distance between the stiffeners is 800mm to 1500mm. In this embodiment, the span direction span and the perpendicular direction span between the vertical supporting steel columns 14 are 7.8m, the distance between the main steel girders in the middle is 1.3m, the section height is 1000mm, the section width is 150mm, and the distance between stiffening plates is It is 1300mm.

As shown in Figures 1-3 and Figures 2 to 4, the double-cantilevered main steel beams on both sides are located outside the vertical supporting steel columns 14 on both sides, including span-directed cantilevered steel frame beams-5, span-directed Cantilevered steel frame beam 2 6, orthogonal cantilevered steel frame beam 7, corner oblique cantilevered steel frame beam 8, span-directed cantilevered steel secondary beam 1 9, span-directed cantilevered steel secondary beam 2 10, orthogonal The cantilevered steel secondary beams 11 together form a special-shaped plane layout with a peripheral ring. The cantilever root of span-direction cantilevered steel frame beam-5, span-direction cantilevered steel-frame beam-6, orthogonal-direction cantilevered steel frame beam 7, and corner obliquely cantilevered steel-frame beam 8 is rigidly connected to the vertical support The top of the steel column 14, the cantilevered end is a free cantilevered state; It is directly connected to the span steel frame beam 1, the orthogonal steel frame beam 2 or the corner obliquely cantilevered steel frame beam 8, and the cantilever end is in a free cantilever state.

As shown in Fig. 1-3, Fig. 2 to Fig. 4 and Fig. 5-1 to Fig. 5-7, the corners and forms of the special-shaped outer circular plane and the inner special-shaped plane are in one-to-one correspondence. The special-shaped plane layout of the outer ring is to realize the plane turning at the corner by tilting the corner to the steel frame beam 8. The turning angle at the plane turning is 30°～120°, and the right-angle corner with a turning angle of 90° is the simplest and most versatile; the special-shaped plane The forms include L-shape, T-shape, U-shape, Z-shape, I-shape, cross-shape and back-shape, all of which are special-shaped plane combinations with multiple corners. In this embodiment, the special-shaped plane of the outer ring is L-shaped, and the turning angle at the turning point of the plane is 90°.

As shown in Figure 1-3, Figure 2, Figure 6-1 and Figure 6-2, the main steel girders with double cantilever on both sides are steel beam members with narrow flange and variable cross-section rigidly connected at the root of the cantilever. The constant cross-section section 12 at the root of the cantilever beam and the variable-section section 13 at the end of the cantilever beam; the double-cantilever main steel beams on both sides are independent cantilever beam structures, which are arranged in one-to-one correspondence with the central main steel girder. The double cantilevered main steel girder and the middle main steel girder together constitute the core support structure of the long-span double cantilevered.

As shown in Figure 1-3, Figure 2, Figure 6-1 and Figure 6-2, the cantilever span of the cantilevered main steel girders in the span direction and orthogonal direction is 10m~15m, and the distance between the double cantilevered main steel girders on both sides 1m~3m, the section type is H-shaped section or box section, the root is in the form of equal section, the height of the root section is the same as the height of the main steel beam in the middle, that is, 800mm~1500mm; the end is in the form of variable section, and the section width starts from the root The height of the section at the root is 800mm-1500mm, the height of the section at the end is 200mm-400mm; the width of the section is 150-250mm; stiffening plates are set on both sides of the H-shaped section, and the distance between the stiffening plates is 800mm-1500mm . The arrangement of the main steel girders with narrow flanges and small spacing on both sides of the double cantilever can effectively meet the architectural requirements of large space at the bottom and large overhangs. In this embodiment, the cantilever span of the cantilevered main steel girder in the span direction and the orthogonal direction is 7.8m, the distance between the double cantilevered main steel girders on both sides is 1.3m, the section height of the root is 1000mm, and the section height of the end is from the 1000mm is gradually reduced to 200mm at the end, the section width is 150mm, and the distance between the stiffeners is 1300mm.

As shown in Fig. 1-1, Fig. 1-3, Fig. 3, Fig. 4 and Fig. 7, the rigid connection of the main steel beam in the middle, the double cantilevered main steel beam on both sides and the vertical supporting steel column 14 is bolt welding connection or solder connection.

As shown in Figure 1-3, Figure 2, Figure 5-1 to Figure 5-7, the large-span double-cantilever core support frame composed of double-cantilevered main steel beams on both sides and the central main steel beam, its special-shaped plane frame The forms include L-shaped planar steel frame 21 (Fig. 5-1), T-shaped planar steel frame 22 (Fig. 5-2), U-shaped planar steel frame 23 (Fig. 5-3), and Z-shaped planar steel frame 24 (Fig. 5 -4), I-shaped planar steel frame 25 (Fig. 5-5), cross-shaped planar steel frame 26 (Fig. 5-6) and back-shaped planar steel frame 27 (Fig. 5-7). Flat combination type.

As shown in Figures 1-4 and Figures 2 to 4, the vertical supporting steel column 14 is located below the main steel beam in the middle, and is a cross-shaped steel member. The top of the vertical supporting steel column 14 is converted into a box-shaped cross-section. The box-shaped conversion node 15 at the top of the steel column is rigidly connected to the end of the main steel beam in the middle; the box-shaped conversion form can fully realize the rigid connection of the beam-column components, and strengthen the rigidity and strength of the connection node.

As shown in Figures 1-4, Figures 2 to 4 and Figure 7, the internal cross partitions of the cross-shaped steel members vertically supporting the steel column 14 extend to the top of the box-shaped transition node to serve as a box-shaped transition at the top of the steel column The internal vertical reinforcement diaphragm of node 15 is used for node reinforcement.

As shown in Figures 1-4, Figures 2 to 4 and Figure 8, the bottom of the vertical supporting steel column 14 is rigidly connected to the base pier at the bottom through the rigid column foot node 16 at the bottom of the steel column; the vertical supporting steel column 14 The side length of the section is 400mm ~ 800mm. In this embodiment, the side length of the section of the vertical supporting steel column 14 is 500mm.

As shown in Figure 1-5, Figure 2, Figure 3 and Figure 4, the horizontal lateral support bar is located between the double cantilevered main steel beams on both sides, as the lateral support steel beams of the double cantilevered main steel beams on both sides components, while enhancing the torsional rigidity of the overall structural system. The horizontal lateral struts are composed of the first horizontal lateral struts 17 and the second horizontal lateral struts 18; At the intersection of the end variable sections, the second horizontal lateral strut 18 is located in the middle of the end variable sections.

As shown in Fig. 1-5, Fig. 2, Fig. 3 and Fig. 4, the horizontal lateral strut is a round steel pipe member with a cross-sectional diameter of 100mm to 200mm, and is vertically displaced downward along the cross-section of the double cantilevered main steel beam on both sides. The two ends are hinged to connect the webs of the double cantilevered main steel girders on both sides to provide horizontal lateral support. In this embodiment, the section diameter of the horizontal lateral strut is 100 mm, and the vertical downward deviation of the section of the two-way cantilevered main steel beam along both sides is 350 mm.

As shown in Figures 1-5, Figure 2, Figure 3, Figure 4 and Figure 8, the bottom base pier is located at the bottom of the vertical support steel column 14, and the bottom base pier section 19, the bottom base The upper expansion section 20 of the seat is composed of a T-shaped column pier platform with a certain height, and the platform height is 600mm-1500mm, so as to provide sufficient anchor bolt anchorage length. In this embodiment, the height of the platform is 1000 mm, and the anchor bolts are anchored to the concrete frame column, frame beam or corner column member of the shear wall below the base pier.

As shown in Figure 1-5, Figure 2, Figure 3, Figure 4 and Figure 8, the exposed rigid column foot height foundation is used for rigid connection between the bottom base pier and the vertical support steel column 14.

The plane shape of the special-shaped layout, the section height and section form of the central main steel beam and the double-cantilever main steel beam on both sides, the variable section slope of the double-cantilever main steel beam on both sides, and the span distance of the vertical supporting steel column, the bottom The form of rigid column feet can be adjusted appropriately according to the requirements of architectural modeling, functional space, large space span at the bottom and boundary conditions, and will not affect the narrow-flange variable-section steel frame roof with special-shaped plane double cantilever of the utility model. The components of the structure and how they are constructed.

Embodiment two

As shown in Figure 9, the specific component composition process of the special-shaped plane double-overhang narrow-flange variable-section steel frame roof structure is as follows:

S1. The two ends of the span steel frame beam 1, the orthogonal steel frame beam 2 and the angled steel frame beam 3 are rigidly connected to the top of the vertical supporting steel column 14, and the two ends of the span steel secondary beam 4 The end is rigidly connected to the orthogonal steel frame beam 2, which together form the main steel beam in the middle;

S2. The cantilever roots of span-direction cantilevered steel frame 1 5, span-directed cantilevered steel frame 2 6, orthogonal cantilevered steel frame beam 7 and corner obliquely cantilevered steel frame beam 8 are rigidly connected to vertical supports The top of the steel column 14, the cantilever roots of the span-directed cantilevered steel secondary beam 1 9 and the span-directed cantilevered steel secondary beam 2 10 are rigidly connected to the orthogonal steel frame beam 2, and the orthogonal cantilevered steel secondary beam 11 The cantilevered root of the cantilevered beam is rigidly connected to the span-directed steel frame beam 1, which together constitute the double cantilevered main steel girder on both sides; Part variable section section 13;

S3. The double-cantilevered main steel beams on both sides are independent cantilevered beams on both sides. Together they form the core support structure;

S4. The first horizontal lateral strut 17 and the second horizontal lateral strut 18 form a horizontal lateral support, and the two ends of the horizontal lateral support are hinged to connect the webs of the double cantilevered main steel beams on both sides assembled in step S2 ;

S5, the core support frame assembled in step S3 is supported on the vertical support steel column 14 through the box-shaped conversion node 15 at the top of the steel column, and the bottom of the core support frame is the rigid column foot node 16 at the bottom of the vertical support steel column 14;

S6. The rigid column foot node 16 at the bottom of the vertical support steel column 14 falls on the bottom base pier, which is composed of the lower pier section 19 of the bottom base and the upper enlarged section 20 of the bottom base.

The steel frame roof structure is a special-shaped plane form, including L-shaped plane steel frame 21, T-shaped plane steel frame 22, U-shaped plane steel frame 23, Z-shaped plane steel frame 24, cross-shaped plane steel frame 25, I-shaped plane steel Framework 26, back-shaped plane steel framework 27.

Embodiment three

The utility model also provides a special-shaped plane double-overhanging narrow-flange variable-section steel frame roof structure with a large space at the bottom and large overhangs on both sides. Application, the double cantilever refers to the span of the largest steel beam cantilever on both sides of the structure is not less than 10m. A typical application case of the utility model is the steel frame roof structure of the roof of the main building of the Taizhou Hospital New Campus Project.

Claims (8)

1. A narrow-flange variable-section steel frame roof with special-shaped plane double overhangs, characterized in that it comprises: a core support frame, a vertical support steel column (14), a horizontal lateral strut and a base pier at the bottom The core support frame is supported on multiple vertical support steel columns (14) through the box-shaped transfer node (15) at the top of the steel column; the core support frame is composed of the main steel beam in the middle and double cantilevered main steel beams on both sides; The lateral braces are located between the double cantilevered main steel girders on both sides, as the lateral supporting steel members of the double cantilevered main steel girders on both sides; the horizontal lateral braces include the first horizontal lateral braces (17) and The second horizontal lateral strut (18); the bottom base pier is located at the bottom of the vertical support steel column (14), and is composed of the lower pier section (19) of the bottom base and the upper enlarged section (20) of the bottom base )composition; The main steel girder in the middle is located on the top of several vertical supporting steel columns (14), and the main steel girder in the middle is composed of a span-to-steel frame beam (1), an orthogonal steel-frame beam (2), and a corner-to-slope steel frame beam (3). and the span-direction steel secondary beam (4); the two ends of the span-direction steel frame beam (1), the orthogonal steel frame beam (2) and the corner oblique steel frame beam (3) are rigidly connected to the vertical to the top of the supporting steel column (14); the two ends of the span steel secondary beam (4) are rigidly connected to the orthogonal steel frame beam (2) or the corner inclined steel frame beam (3); the middle main steel beam The whole is an internal special-shaped plane; The main steel beams with double cantilever on both sides are located outside the top sides of multiple vertical supporting steel columns (14); Steel frame beam two (6), orthogonal cantilever steel frame beam (7), corner oblique cantilever steel frame beam (8), span direction cantilever steel secondary beam one (9), span direction cantilever steel secondary beam Beam 2 (10) and orthogonal cantilevered steel secondary beams (11); the double-cantilevered main steel beams on both sides are an external annular special-shaped plane as a whole; The cantilevered roots of the second steel frame beam (6), the orthogonal cantilevered steel frame beam (7) and the corner obliquely cantilevered steel frame beam (8) are rigidly connected to the top of the vertical supporting steel column (14), Cantilevering of span-direction cantilevered steel frame beam 1 (5), span-direction cantilevered steel frame beam 2 (6), orthogonal cantilevered steel frame beam (7) and corner obliquely cantilevered steel frame beam (8) The ends are in a free cantilever state; the cantilever roots of the span-to-cantilever steel secondary beam 1 (9), the span-to-cantilever steel secondary beam 2 (10) and the orthogonal cantilevered steel secondary beam (11) are rigidly connected To the span-direction steel frame beam (1), the orthogonal steel frame beam (2) or the corner obliquely cantilevered steel frame beam (8), the span-direction cantilever steel secondary beam one (9), the span-direction cantilever steel The cantilevered ends of the second secondary beam (10) and the orthogonal cantilevered steel secondary beam (11) are in a free cantilevered state. 2. The narrow-flange variable-section steel frame roof with special-shaped plane double cantilever according to claim 1, characterized in that: the internal special-shaped plane formed by the main steel beam in the middle is L-shaped, T-shaped, U-shaped, or Z-shaped , I-shaped, cross-shaped or back-shaped plane; the internal special-shaped plane adopts a corner oblique steel frame beam (3) as the plane turning at the corner, and the turning angle of the plane turning is 30°～120°; double cantilever on both sides The outer annular special-shaped plane formed by the main steel beam is L-shaped, T-shaped, U-shaped, Z-shaped, I-shaped, cross-shaped or back-shaped plane; the corner at the turning point of the plane is 30°～120°; There is a one-to-one correspondence between the plane and the corners of the internal special-shaped plane and the special-shaped forms. 3. The narrow-flange variable-section steel frame roof with special-shaped plane double overhangs according to claim 2, characterized in that: the internal special-shaped plane and the external annular special-shaped plane together form a special-shaped plane frame, and the special-shaped plane frame includes L-shaped Planar steel frame (21), T-shaped planar steel frame (22), U-shaped planar steel frame (23), Z-shaped planar steel frame (24), I-shaped planar steel frame (25), cross-shaped planar steel frame (26 ) and back-shaped plane steel frame (27). 4. According to claim 1, the narrow-flange variable-section steel frame roof with special-shaped plane double cantilever is characterized in that: the vertical supporting steel column (14) is located below the main steel beam in the middle, and is a cross-shaped steel member; The connection between the supporting steel column (14) and the central main steel beam is a box section or H-shaped section, and the box-shaped section or H-shaped section is connected to the central main beam through the box-shaped conversion node (15) on the top of the vertical supporting steel column (14). The ends of the steel beams are rigidly connected; the horizontal lateral struts are circular steel pipe members, and the horizontal lateral struts are vertically offset downwards and arranged at multiple intervals. The web plate of the steel beam; the first horizontal lateral strut (17) and the second horizontal lateral strut (18) are both round steel pipe members with a cross-sectional diameter of 100 mm to 200 mm; the base pier at the bottom has a height of T-shaped pier platform within 600mm～1500mm. 5. According to claim 4, the narrow-flange variable-section steel frame roof with special-shaped plane double cantilever is characterized in that: the internal cross partition of the cross-shaped steel member vertically supporting the steel column (14) extends to the box-shaped conversion The top of the node (15) is used as a vertical reinforcement partition inside the box-type transfer node (15) at the top of the vertical support steel column (14). 6. According to claim 1, the narrow-flange variable-section steel frame roof with special-shaped plane double cantilever is characterized in that: the main steel girders with double cantilever on both sides are independent cantilever beams on both sides, and the main steel girder in the middle is connected to the The main steel girders with double cantilever on both sides are arranged in one-to-one correspondence; The first horizontal lateral strut (17) is located at the intersection of the root constant section section (12) and the end variable section section (13) of the double cantilever main steel girder on both sides; the second horizontal lateral strut (18) It is located in the middle of the end tapering section (13). 7. According to claim 1 or 2, the narrow-flange variable-section steel frame roof with special-shaped plane double overhangs is characterized in that: the rigid connection is a bolted connection or a welded connection; the pier of the bottom base and the vertical support steel The columns (14) are rigidly connected by an exposed rigid column foot height foundation; each vertical support steel column (14) is provided with a rigid column foot node (16) at the bottom, which is rigidly connected to the base pier at the bottom; The side length of the cross section of the supporting steel column (14) is 400mm-800mm. 8. The narrow-flange variable-section steel frame roof with special-shaped plane double cantilever according to claim 1, characterized in that: In the main steel beam in the middle, the span direction span and the perpendicular direction span between two adjacent vertical supporting steel columns (14) are both 7m-10m; The distance between the main steel girders in the middle is 1m~3m; the section type of the main steel beams in the middle is box section or H section, the section height is 800mm~1500mm, and the section width is 150~250mm; stiffening plates are arranged on both sides of the H section , the distance between stiffening plates is 800mm～1500mm; In the double-cantilevered main steel girder on both sides, the cantilevered spans of spanwise cantilevered steel frame beam 1 (5), spanwise cantilevered steel frame beam 2 (6) and orthogonally cantilevered steel frame beam (7) are 10m～15m; The distance between the double cantilevered main steel beams on both sides is 1m~3m; the section type of the double cantilevered main steel beams on both sides is H-shaped section or box-shaped section, the root is in the form of equal section, and the height of the root section is the same as that of the central main steel beam. Both are 800mm-1500mm; the ends of the double-cantilevered main steel beams on both sides are in the form of variable cross-section, and the cross-section width changes gradually from the root to the end. The width is 150-250mm; stiffening plates are arranged on both sides of the H-shaped section, and the distance between the stiffening plates is 800mm-1500mm.

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