Combined structure of spring layer truss and large-span frame beam

Abstract

The invention discloses a combined structure of a spring layer truss and a large-span frame beam. The combined structure mainly comprises three rows of frame columns, a spring layer truss, a plurality of common frame beams, a large-span frame beam, a plurality of cantilever beams, a plurality of steel secondary beams, a plurality of first lug plates and a plurality of second lug plates, and the first lug plates and the second lug plates which are adjacent front and back are connected through a plurality of steel pull rods respectively. And a tensioner is arranged in the middle of the steel pull rod and can apply pretension force in a grading manner to enable the large-span frame beam to generate an inverted arch to reach a design value. According to the combined structure of the spring layer truss and the large-span frame beam, the height of the large-span beam can be reduced, and the indoor clear height can be increased.

Description

Technical Field

[0001] The present invention relates to the technical field of building steel structures, and in particular to a combined structure of a leap-story truss and a large-span frame beam, which is suitable for working conditions where the beam height is limited in large-span buildings such as gymnasiums and exhibition centers. Background Art

[0002] With the widespread application of large-span building structures in public buildings such as stadiums and convention centers, their design needs to take into account the dual needs of architectural aesthetics and structural mechanics. However, traditional large-span frame beams are limited by floor height constraints, equipment pipeline layout and ceiling space occupation, and are often forced to adopt ultra-high cross-sections (such as a 36m span beam with a height of 1.8m), resulting in a lower-level clearance height of less than 3m, which not only violates the optimal solution of structural mechanics, but also affects the indoor space user experience. To this end, the present invention innovatively proposes a collaborative force system of jump-story trusses and large-span frame beams, which significantly reduces the beam height to HN800×300 through the prestressed steel tie rods and the four-span continuous beam effect, while ensuring that the indoor clearance is ≥3.8m and achieving an ultra-large span of 36m. This structural form has been verified by actual engineering and is particularly suitable for scenarios such as commercial complexes and transportation hubs where floor height is limited but the net height needs to be strictly controlled. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a combined structure of a leap-level truss and a large-span frame beam, which connects the leap-level truss and the large-span frame beam through steel tie rods, fully utilizing the vertical stiffness of the leap-level truss and the tensile bearing capacity of the steel tie rods, so that three support points are added in the mid-span of the large-span steel beam, and the original large-span beam is transformed into a four-span continuous beam, reducing the mid-span bending moment of the beam, thereby reducing the height of the beam and increasing the net height of the room on the next floor.

[0004] According to one aspect of the present invention, a combined structure of a leap-floor truss and a long-span frame beam is provided, comprising:

[0005] Frame columns: multiple frame columns are divided into three rows: front, middle and back, and multiple frame columns in the middle row are higher than other frame columns;

[0006] The leap-level truss is fixedly installed on the top of each frame column in the front row, and the frame columns in the middle row and the leap-level truss are connected by multiple ordinary frame beams;

[0007] Long-span frame beams are installed on the frame columns in the rear row, and are connected to the frame columns in the middle row via multiple cantilever beams. Multiple steel secondary beams are used to connect the front and rear ordinary frame beams and the cantilever beams.

[0008] First ear plates, a plurality of first ear plates are respectively welded at the quarter points of the leap-level truss and the long-span frame beam;

[0009] A first ear plate and a plurality of second ear plates are respectively welded to the top ends of the plurality of middle frame columns in the middle row;

[0010] Among them, the first ear plate and the second ear plate adjacent to each other in front and behind are connected by multiple steel tie rods, and a tensioner is provided in the middle of the steel tie rod. The tensioner can apply pre-tension in stages to make the long-span frame beam arch back to the design value.

[0011] In some embodiments, the frame columns are made of round steel and are vertically installed using a full penetration welding process. The invention is beneficial in that the material and specific installation method of the frame columns are described.

[0012] In some embodiments, the front and rear rows each have two frame columns, the middle row has five frame columns, and the three in the middle are taller than the two on either side.

[0013] In some embodiments, in step S2, the jump truss is welded and fixed by high-altitude segmented assembly or overall hydraulic lifting. The benefit lies in describing the specific welding method of the jump truss.

[0014] In some embodiments, each common frame beam extends horizontally in the front-to-back direction and the left-to-right direction, respectively.

[0015] In some embodiments, each common frame beam, long-span frame beam, and each steel secondary beam are installed using high-strength bolts in conjunction with a gusset plate with stiffening ribs. This is beneficial in that it can achieve stable installation of each common frame beam, long-span frame beam, and each steel secondary beam.

[0016] In some embodiments, each first ear plate and each second ear plate are aligned on a plurality of horizontal lines extending forward and backward after welding.

[0017] In some embodiments, both ends of the steel tie rod are hinged to the first ear plate and the second ear plate respectively through a pin. The advantage of this is that it further describes the installation method of the steel tie rod.

[0018] In some embodiments, the pre-tension force levels that can be applied by the tensioner in a graded manner include 50% of the design value, 80% of the design value, and 100% of the design value. The invention is beneficial in that the graded pre-tension force levels are described.

[0019] In some embodiments, a steel truss floor deck is laid on the composite structure and poured with concrete, which is beneficial in that it supplements the further construction method after the composite structure is erected. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an isometric diagram of a combined structure of a leap-story truss and a long-span frame beam according to one embodiment of the present invention;

[0021] Figure 2 for Figure 1 A top view of a combined structure of a leap-level truss and a long-span frame beam is shown;

[0022] Figure 3 for Figure 1 A front view of a combined structure of a leap-level truss and a long-span frame beam is shown;

[0023] Figure 4 for Figure 1 A left side view of a combined structure of a leap-level truss and a long-span frame beam is shown;

[0024] Figure 5 for Figure 1 The following is a construction flow chart of a combined structure of a leap-story truss and a large-span frame beam;

[0025] Figure 6 for Figure 5 The isometric drawing of the construction process of the combined structure of the split-level truss and the long-span frame beam after the installation of multiple frame columns;

[0026] Figure 7 for Figure 5 The construction process of the combined structure of the jump truss and the long-span frame beam is shown in the isometric drawing after the jump truss is fixed;

[0027] Figure 8 for Figure 5 The isometric drawing of the construction process of the combined structure of the jump-story truss and the long-span frame beam after the installation of multiple ordinary frame beams;

[0028] Figure 9 for Figure 5 The construction process of the combined structure of the jump-story truss and the long-span frame beam is shown in the isometric drawing after the long-span frame beam and each cantilever beam are installed;

[0029] Figure 10 for Figure 5 An isometric drawing of the construction process of the combined structure of the jump-story truss and the long-span frame beam after welding the first ear plates and the second ear plates;

[0030] Figure 11 for Figure 5 The isometric drawing of the construction process of the combined structure of the jump-story truss and the long-span frame beam after the steel tie rods are installed;

[0031] Figure 12 for Figure 5 Isometric drawing of the construction process of the combined structure of jump-story trusses and long-span frame beams after the installation of the steel secondary beams.

[0032] In the figure: leap-layer truss 1, long-span frame beam 2, steel tie rod 3, frame column 4, ordinary frame beam 5, cantilever beam 6, steel secondary beam 7, first ear plate 8, second ear plate 9, tensioner 10, pin 11. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings.

[0034] like Figure 1-4 As shown, the composite structure mainly includes three rows of frame columns, a leap-story truss, multiple ordinary frame beams, a large-span frame beam, multiple cantilever beams, multiple steel secondary beams, multiple first ear plates, multiple second ear plates, multiple steel tie rods, etc.

[0035] The multiple frame columns are divided into three rows: front, middle and rear. The front row and the rear row each have two columns, the middle row has five columns, and the three in the middle are higher than the two on both sides and the frame columns in the front and rear rows.

[0036] Preferably, each frame column is made of round steel with a size of P800×30 mm, and is vertically installed in three rows (set as the front row, the middle row and the rear row) using a full penetration welding process.

[0037] The jump truss is fixedly installed on the top of each frame column in the front row, and the frame columns in the middle row and the jump truss are connected by a plurality of ordinary frame beams.

[0038] Preferably, the height of the leap-level truss is 5m, the cross-sectional dimensions of the chord member are H800*400*40*40mm, and the cross-sectional dimensions of the web member are H450*400*50*50mm.

[0039] Preferably, multiple ordinary frame beams extend horizontally in two horizontal directions perpendicular to each other (set to the front-to-back direction and the left-to-right direction), wherein the ordinary frame beams extending in the front-to-back direction are used for connecting the frame columns in the middle row and the leap-story trusses, and the ordinary frame beams extending in the left-to-right direction are used for connecting the frame columns in the middle row.

[0040] Preferably, the span of the ordinary frame beam is 9m, and the span of the leap-level truss and the large-span frame beam is 36m.

[0041] The long-span frame beams are installed on the frame columns in the rear row and are connected to the frame columns in the middle row via multiple cantilever beams. The front and rear ordinary frame beams and the cantilever beams are connected via multiple steel secondary beams.

[0042] Preferably, the cross-section of the steel secondary beam is HM588x300x12x20.

[0043] Preferably, the cantilever beam extends in the front-rear direction and has dimensions of HN800x300x14x26.

[0044] Multiple first lug plates are welded at the 1 / 4, 1 / 2, and 3 / 4 positions of the split-level trusses and long-span frame beams, i.e., at each quarter-division point. Multiple second lug plates are welded to the tops of the three middle frame columns in the middle row. The adjacent first and second lug plates are connected by multiple steel tie rods.

[0045] Preferably, each of the first ear plate and the second ear plate is made of Q355B steel and has a thickness of 80 mm.

[0046] A tensioner is installed in the middle of the steel tie rod, which can apply pre-tension in stages to make the long-span frame beam arch to the designed value.

[0047] Preferably, each of the first ear plate and the second ear plate is made of Q355B steel and has a thickness of 80 mm.

[0048] Preferably, the steel pull rod has a diameter of 100 mm and a tensile strength of ≥600 MPa, and both ends of the steel pull rod are hinged to the first ear plate and the second ear plate respectively through a pin made of 40Cr steel with a diameter of 80 mm.

[0049] Preferably, the pre-tension levels that the tensioner can apply in stages include 50% of the design value, 80% of the design value, and 100% of the design value.

[0050] like Figure 5 As shown, the construction method of the combined structure includes the following main steps S1 to S11.

[0051] S1: If Figure 6 As shown, three rows of frame columns around the large span area are installed to the design elevation.

[0052] Among them, ensure that the error between the top of the frame column and the design elevation is no more than 3mm.

[0053] S2: If Figure 7 As shown, a jump truss is welded and fixed on the top of each frame column in the front row.

[0054] The jump-layer trusses are welded and fixed by high-altitude segmented assembly or overall hydraulic lifting, and their verticality deviation is controlled to be no more than H / 1000.

[0055] S3: If Figure 8 As shown, the frame columns in the middle row and the leap-floor trusses are connected by multiple ordinary frame beams.

[0056] Among them, the size of the ordinary frame beam is HN800x300x14x26, and it can be installed with 10.9 grade high-strength bolts (M24) and node plates with stiffening ribs.

[0057] S4: A full-floor scaffolding support system is set up at the bottom of the rear row (not shown in the figure).

[0058] Among them, the vertical pole spacing of the full-floor scaffolding support system is 1.2m, the step distance is 1.5m, and it ensures that the bottom deflection of the beam is no more than L / 400 during the construction phase. It can provide temporary support when the large-span frame beams are subsequently installed, avoiding large vertical deformation of the large-span frame beams under the action of their own weight, and ensuring stability during the construction phase.

[0059] S5: If Figure 9 As shown, a large-span frame beam is installed on each frame column in the rear row through a full-floor scaffolding support system, and the large-span frame beam is connected to each frame column in the middle row through multiple cantilever beams.

[0060] Among them, high-strength bolts can also be used in combination with node plates with stiffening ribs to install large-span frame beams.

[0061] S6: As Figure 10 As shown, multiple first ear plates are welded at the 1 / 4, 1 / 2, and 3 / 4 positions of the leap-layer truss and the large-span frame beam, that is, at each quarter-division point, and multiple second ear plates are welded at the top ends of the three middle frame columns in the middle row.

[0062] The weld grade of the welding is level one, and each first ear plate and each second ear plate are aligned on a plurality of horizontal lines extending forward and backward after welding.

[0063] S7: As Figure 11 As shown, each of the front and rear adjacent first ear plates and second ear plates are connected by a plurality of steel tie rods, and a tensioner is provided in the middle of the steel tie rods.

[0064] S8: By adjusting the tensioner in the middle of the steel tie rod, pre-tension is applied in stages to cause the long-span frame beam to arch to the design value.

[0065] Among them, the graded pre-tension can be divided into several levels, such as 50% design value, 80% design value, and 100% design value. Large-span frame beams will generally offset 100% of the constant load deflection when a 35mm arch is generated.

[0066] S9: As Figure 12 As shown, the common frame beams extending front and rear and the cantilever beams are connected by multiple steel secondary beams.

[0067] Among them, the steel secondary beam can also be installed using high-strength bolts and node plates with stiffening ribs.

[0068] S10: Lay the steel truss floor deck and pour concrete.

[0069] Among them, the model of the steel truss floor deck is the thick closed type TD3-90, with a laying thickness of 0.8mm, on which a double-layer bidirectional steel mesh is tied, and the poured concrete is C30.

[0070] S11: The full-floor scaffolding support system is dismantled in due time and the construction is completed.

[0071] Among them, it is necessary to dismantle the full-floor scaffolding support system supporting the large-span frame beams in stages after the concrete reaches the age.

[0072] According to finite element analysis, this construction method saves 32% of steel compared with traditional solutions, reduces the bending moment at the beam ends by 74%, increases the ultimate bearing capacity by 63%, and reduces the beam section height by 800mm, effectively increasing the indoor net height.

[0073] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A combined structure of a leap-floor truss and a long-span frame beam, characterized by: include Frame columns (4), wherein the plurality of frame columns (4) are divided into three rows: front, middle, and rear, and the plurality of frame columns (4) in the middle of the middle row are higher than the other frame columns (4); A leap truss (1) is fixedly mounted on the top of each frame column (4) in the front row, and each frame column (4) in the middle row and the leap truss (1) are connected via a plurality of common frame beams (5); A large-span frame beam (2), the large-span frame beam (2) is installed on each frame column (4) in the rear row, and the large-span frame beam (2) is connected to each frame column (4) in the middle row via a plurality of cantilever beams (6), wherein each common frame beam (5) extending forward and backward and each cantilever beam (6) are connected via a plurality of steel secondary beams (7); A first ear plate (8), wherein a plurality of first ear plates (8) are respectively welded at the positions of the quarter points of the leap-level truss and the long-span frame beam; A first ear plate (9) and a plurality of second ear plates (9) are respectively welded to the top ends of a plurality of middle frame columns (4) in the middle row; Among them, each of the first ear plate (8) and the second ear plate (9) adjacent to each other in the front and rear is connected by a plurality of steel tie rods (3), and a tensioner (10) is provided in the middle of the steel tie rod (3). The tensioner (10) can apply pre-tension in stages to make the long-span frame beam (2) produce an anti-arch to the design value.

2. The combined structure of a leap-floor truss and a long-span frame beam according to claim 1, characterized in that: The frame columns (4) are made of round steel and are installed vertically using a full penetration welding process.

3. The combined structure of a leap-floor truss and a long-span frame beam according to claim 1, characterized in that: The front and rear rows each have two frame columns (4), the middle row has five frame columns (4) and the three in the middle are higher than the other frame columns (4).

4. The combined structure of a leap-floor truss and a long-span frame beam according to claim 1, characterized in that: The leap-storey truss (1) is welded and fixed by high-altitude segmented assembly or overall hydraulic lifting.

5. The combined structure of a leap-floor truss and a long-span frame beam according to claim 1, characterized in that: Each common frame beam (5) extends horizontally in the front-rear direction and the left-right direction respectively.

6. The combined structure of a leap-story truss and a long-span frame beam according to claim 1, characterized in that: Each common frame beam (5), the large-span frame beam (2), and each steel secondary beam (7) are installed by using high-strength bolts in combination with a node plate with stiffening ribs.

7. The combined structure of a leap-story truss and a long-span frame beam according to claim 1, characterized in that: Each first ear plate (8) and each second ear plate (9) are aligned on a plurality of horizontal lines extending forward and backward.

8. The combined structure of a leap-story truss and a long-span frame beam according to claim 1, characterized in that: Both ends of the steel pull rod (9) are hinged to the first ear plate (8) and the second ear plate (9) respectively through a pin shaft (11).

9. The combined structure of a leap-story truss and a long-span frame beam according to claim 1, characterized in that: The tensioner (10) can apply pre-tensioning force in stages, including 50% of the design value, 80% of the design value, and 100% of the design value.

10. The combined structure of a leap-floor truss and a long-span frame beam according to claim 1, characterized in that: The reinforced truss floor deck is laid on the composite structure and poured with concrete.

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