阅读说明：本技术 一种用于大跨度楼梯的斜底踏步梯梁结构及使用方法 (Inclined-bottom stepping ladder beam structure for large-span stairs and use method ) 是由 井彦青 肖艳 肖栋 李建峰 王连青 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种用于大跨度楼梯的斜底踏步梯梁结构及使用方法,包括斜底梯面钢筋骨架和附着在斜底梯面钢筋骨架上的水泥包覆体；斜底梯面钢筋骨架包括斜底梯面钢筋骨架框体、设在斜底梯面钢筋骨架框体上的纵向钢筋组和绑扎在斜底梯面钢筋骨架框体上的箍筋,斜底梯面钢筋骨架的截面为梯形的斜底梯面钢筋笼,截面的底端为斜面,斜面的水平夹角为β；水泥包覆体与斜底梯面钢筋骨架浇筑为一体,构成上台阶梯面和下台阶梯面的斜底踏步梯梁结构。减小了梯段板的计算跨度,解决大跨度现浇混凝土板式楼梯梯板过厚而影响净高的情况,能够将大跨度现浇混凝土板式楼梯荷载分散传递,同时解决了大跨度现浇混凝土板式楼梯梯板过厚而影响净高的难题。(The invention discloses a sloping-bottom tread ladder beam structure for a large-span stair and a use method thereof, wherein the sloping-bottom tread ladder beam structure comprises a sloping-bottom tread reinforcing steel framework and a cement coating body attached to the sloping-bottom tread reinforcing steel framework; the inclined-bottom trapezoidal-face steel reinforcement framework comprises an inclined-bottom trapezoidal-face steel reinforcement framework frame body, a longitudinal steel reinforcement group arranged on the inclined-bottom trapezoidal-face steel reinforcement framework frame body and stirrups bound on the inclined-bottom trapezoidal-face steel reinforcement framework frame body, the cross section of the inclined-bottom trapezoidal-face steel reinforcement framework is a trapezoidal inclined-bottom trapezoidal-face steel reinforcement cage, the bottom end of the cross section is an inclined plane, and the horizontal included angle of the inclined plane is beta; the cement coating body and the inclined bottom step face steel bar framework are poured into a whole to form an inclined bottom step beam structure of the upper step face and the lower step face. The calculated span of the stair section plate is reduced, the problem that the clear height is influenced due to the fact that the large-span cast-in-place concrete slab type stair step plate is too thick is solved, the load of the large-span cast-in-place concrete slab type stair step plate can be dispersed and transmitted, and meanwhile the problem that the clear height is influenced due to the fact that the large-span cast-in-place concrete slab type stair step plate is too thick is solved.)

1. The utility model provides a sloping bottom ladder beam structure of marking time for large-span stair which characterized in that: the steel bar reinforced concrete composite wall comprises an inclined-bottom stair-surface steel bar framework (1) and a cement coating body (2) attached to the inclined-bottom stair-surface steel bar framework (1); the inclined-bottom trapezoidal-face steel reinforcement framework (1) comprises an inclined-bottom trapezoidal-face steel reinforcement framework frame body, a longitudinal steel reinforcement group (1-1) arranged on the inclined-bottom trapezoidal-face steel reinforcement framework frame body and stirrups (1-2) bound on the inclined-bottom trapezoidal-face steel reinforcement framework frame body, the section of the inclined-bottom trapezoidal-face steel reinforcement framework (1) is a trapezoidal inclined-bottom trapezoidal-face steel reinforcement cage, the bottom end of the section is an inclined plane, and the horizontal included angle of the inclined plane is beta; the cement coating body (2) and the inclined bottom step surface steel reinforcement framework (1) are poured into a whole to form an inclined bottom step beam structure of an upper step surface (1-4) and a lower step surface (1-5).

2. A sloping bottom stair step beam structure for a large span stair according to claim 1, wherein: the longitudinal steel bar group (1-1) comprises a stressed steel bar (1-1-1), an erecting steel bar (1-1-2) and a connecting anchoring end (1-1-3); the stressed steel bars (1-1-1) are composed of 4 steel bars and are respectively arranged at the vertical projection positions of the erected steel bars (1-1-2) at the inclined bottom; the erection steel bars (1-1-2) are composed of 6 steel bars, wherein four steel bars are arranged at the corner position of the upper end face of the inclined bottom stair surface steel bar framework (1) at intervals, and the other two erection steel bars (1-1-2) are respectively additionally arranged at the middle position of the lower stair surface (1-5) and the middle position of the vertical face of the lower stair side of the inclined bottom stair surface steel bar framework; the connecting and anchoring ends (1-1-3) are arranged at two ends of the cement coating body (2) and are composed of reserved steel bar sections of the longitudinal steel bar group (1-1).

3. A sloping bottom stair step beam structure for a large span stair according to claim 1, wherein: the stirrups (1-2) are formed by binding the vertical stirrups (1-2-1), the transverse stirrups (1-2-2) and the reinforcing tie bars (1-2-3), the length of an upper stepped surface (1-4) of the stirrups (1-2) is equal to 0.5 time of the length of a lower stepped surface (1-5), and the length of the lower stepped surface (1-5) is 270-280 mm; the reinforcement tie bars (1-2-3) are arranged perpendicular to the stepped surface (1-5) of the lower platform, the upper ends of the reinforcement tie bars (1-2-3) are bound and connected with the steel reinforcement (viii) in the erection steel reinforcements (1-1-2), and the lower ends of the reinforcement tie bars (1-2-3) are bound and connected with the steel reinforcement (viii) in the stressed steel reinforcements (1-1-1).

4. A sloping bottom stair step beam structure for a large span stair according to claim 1, wherein: the distance between stirrups (1-2) bound on the inclined-bottom tread steel reinforcement framework in the longitudinal direction is 100 mm.

5. A sloping bottom stair step beam structure for a large span stair according to claim 2, wherein: the length of the reserved steel bars of the longitudinal steel bar group (1-1) is 200 mm.

6. A sloping bottom stair step beam structure for a large span stair according to claim 1, wherein: the horizontal included angle of the inclined plane at the bottom end of the cross section of the inclined-bottom tread steel reinforcement framework (1) is 28-30 degrees.

7. The use method of a slant-bottom tread ladder beam structure for a large-span staircase according to claim 1, wherein:

connecting the longitudinal reinforcement group (1-1) and the stirrups (1-2) in a binding mode to form an inclined-bottom tread reinforcement cage (1) with the bottom end of the cross section being an inclined plane, and an inclined-bottom tread reinforcement cage with the upper end of the cross section being a trapezoid to form a framework of an inclined-bottom tread beam structure of the large-span stair;

placing the sloping bottom tread steel reinforcement framework (1) in a template of a stair section, and enabling the sloping bottom tread steel reinforcement framework (1) to be located in the middle of a stair structure; then, the top and bottom steel bars of the stair step plate penetrate through the inclined bottom stepping ladder beam steel reinforcement cage framework (1), the steel bars of the stair step plate are bound with the intersections of the first, second, third and fourth steel bars in the inclined bottom stepping ladder beam, and the steel bars of the stair step plate and the inclined bottom ladder face steel reinforcement cage framework are integrated through binding connection of the steel bars; after the reinforcing steel bars of the stair sections and the inclined bottom stair surface reinforcing steel bar frameworks (1) are bound, pouring concrete together, and wrapping to form a concrete wrapping body of the whole stair section, wherein the stair section plate reinforcing steel bars, the inclined bottom stair surface reinforcing steel bar frameworks (1) and the concrete wrapping body are adhered into a whole through concrete to jointly form a stair section structure additionally provided with an inclined bottom step ladder beam structure;

connecting and anchoring ends (1-1-3) at two ends of the inclined bottom tread steel reinforcement framework (1) and steel reinforcements in columns of the ladder column of the plate type stair structure are bound and connected, and then the inclined bottom tread steel reinforcement framework and the steel reinforcements are poured together by concrete and wrapped to form integral rigid connection; when the stair structure bears, the stair step plate transmits the load to the sloping bottom tread step beam structure, and the sloping bottom tread step beam structure transmits the load to the step post of the plate-type stair structure through the sloping bottom tread reinforcing steel bar framework (1) and the cement cladding body (2), and finally transmits the load to the frame structure of the building.

Technical Field

The invention relates to a sloping bottom step ladder beam structure for a large-span stair and a using method thereof, in particular to a sloping bottom step ladder beam structure of a large-span cast-in-place concrete slab type scissor stair structure, which is suitable for a slab type stair structure in a small-rise building.

Background

The plate type stairs for large-span commercial buildings at present mostly adopt a thick plate structure or a form of adding a rectangular ladder beam in the middle of a ladder section and adding a middle ladder column, when the spans are small and the floor heights are high, the net height can meet requirements, but when the spans are large and the floor heights are small, if the spans are larger than 7.5 meters, the floor heights are smaller than 5.1 meters, the net height of the stairs can not meet the requirements due to the fact that the ladder section plates are thick and the deflection is large or the height of the rectangular ladder beam arranged in the middle of the ladder section plates is high, for example, a traditional rectangular beam is adopted, the beam width is one step width, but the height needs to reach 300-400 mm, and when the floor heights are small, the net height under the beam can not meet the design requirements, and the use of building functions is influenced.

Disclosure of Invention

The technical problem is as follows: the invention aims to overcome the defects in the prior art and provides a sloping bottom step ladder beam structure of a large-span stair, which has the advantages of simple structure, small self weight, small deflection, material saving and adaptation to the effect of a large-span cast-in-place concrete slab type scissor stair with larger span and smaller layer height, and a use method thereof.

The technical scheme is as follows: the invention relates to a sloping-bottom tread ladder beam structure for a large-span stair, which comprises a sloping-bottom tread reinforcing steel framework and a cement coating body attached to the sloping-bottom tread reinforcing steel framework; the inclined bottom trapezoidal surface steel reinforcement framework comprises an inclined bottom trapezoidal surface steel reinforcement framework frame body, a longitudinal steel reinforcement group arranged on the inclined bottom trapezoidal surface steel reinforcement framework frame body and stirrups bound on the inclined bottom trapezoidal surface steel reinforcement framework frame body, the cross section of the inclined bottom trapezoidal surface steel reinforcement framework is a trapezoidal inclined bottom trapezoidal surface steel reinforcement cage, the bottom end of the cross section is an inclined plane, and the horizontal included angle of the inclined plane is beta; the cement coating body and the inclined bottom step face steel bar framework are poured into a whole to form an inclined bottom step beam structure of the upper step face and the lower step face.

The longitudinal steel bar group comprises a stressed steel bar, an erecting steel bar and a connecting anchoring end; the stress steel bars consist of 4 steel bars and are respectively arranged at the vertical projection positions of the erection steel bars at the inclined bottom; the erection steel bars consist of 6 steel bars, wherein four steel bars are arranged at the corner positions of the upper end surface of the inclined-bottom stair surface steel bar framework at intervals, and the other two erection steel bars are respectively additionally arranged at the middle position of the step surface of the lower platform and the middle position of the vertical surface of the lower step side of the inclined-bottom stair surface steel bar framework; the connecting anchoring ends are arranged at two ends of the cement coating body and are formed by reserved steel bar sections of the longitudinal steel bar groups.

The stirrups are formed by binding vertical stirrups, transverse stirrups and reinforcing tie bars, the length of the upper step ladder surface of each stirrup is equal to 0.5 time of the length of the lower step ladder surface, and the length of the lower step ladder surface is 270 plus 280 mm; the reinforcing tie bar is arranged perpendicular to the stepped surface of the lower platform, the upper end of the reinforcing tie bar is bound and connected with the steel bar (the eighth steel bar) in the erecting steel bar, and the lower end of the reinforcing tie bar is bound and connected with the steel bar (the third steel bar) in the stressed steel bar.

The distance between stirrups tied on the inclined-bottom tread steel reinforcement framework body and arranged in the longitudinal direction is 100 mm.

The length of the reserved steel bars of the longitudinal steel bar group is 200 mm.

The horizontal included angle of the inclined plane at the bottom end of the cross section of the inclined-bottom tread steel reinforcement framework is 28-30 degrees.

The use method of the sloping bottom step ladder beam structure for the large-span stairway comprises the following steps:

connecting the longitudinal reinforcement group (1-1) and the stirrups (1-2) in a binding mode to form an inclined-bottom tread reinforcement cage (1) with the bottom end of the cross section being an inclined plane, and an inclined-bottom tread reinforcement cage with the upper end of the cross section being a trapezoid to form a framework of an inclined-bottom tread beam structure of the large-span stair;

placing the sloping bottom tread steel reinforcement framework (1) in a template of a stair section, and enabling the sloping bottom tread steel reinforcement framework (1) to be located in the middle of a stair structure; then, the top and bottom steel bars of the stair step plate penetrate through the inclined bottom stepping ladder beam steel reinforcement cage framework (1), the steel bars of the stair step plate are bound with the intersections of the first, second, third and fourth steel bars in the inclined bottom stepping ladder beam, and the steel bars of the stair step plate and the inclined bottom ladder face steel reinforcement cage framework are integrated through binding connection of the steel bars; after the reinforcing steel bars of the stair sections and the inclined bottom stair surface reinforcing steel bar frameworks (1) are bound, pouring concrete together, and wrapping to form a concrete wrapping body of the whole stair section, wherein the stair section plate reinforcing steel bars, the inclined bottom stair surface reinforcing steel bar frameworks (1) and the concrete wrapping body are adhered into a whole through concrete to jointly form a stair section structure additionally provided with an inclined bottom step ladder beam structure;

connecting and anchoring ends (1-1-3) at two ends of the inclined bottom tread steel reinforcement framework (1) and steel reinforcements in columns of the ladder column of the plate type stair structure are bound and connected, and then the inclined bottom tread steel reinforcement framework and the steel reinforcements are poured together by concrete and wrapped to form integral rigid connection; when the stair structure bears, the stair step plate transmits the load to the sloping bottom tread step beam structure, and the sloping bottom tread step beam structure transmits the load to the step post of the plate-type stair structure through the sloping bottom tread reinforcing steel bar framework (1) and the cement cladding body (2), and finally transmits the load to the frame structure of the building.

Has the advantages that: the sloping bottom step ladder beam structure divides the plate type staircase into an upper half section and a lower half section, and respective loads are transmitted to the column body through the sloping bottom step ladder beam structure, so that the calculated span of the ladder section plates is reduced, the problem that the net height is influenced due to the fact that the large-span cast-in-place concrete plate type staircase plates are too thick is solved, the space at the lower part of the ladder section is greatly saved, and the requirement of the net height of the staircase under the condition of a smaller layer height can be met; and because no beam is outstanding in the ladder section plate span, the problem that the net height is influenced because the cross section of the ladder beam is too high when the ladder beam is added in the middle of the ladder section is solved, and the appearance of the staircase is improved. Compared with the prior art, the main advantages are as follows:

(1) the problem that large-span and small-storey height commercial building plate type stairways are large in self weight and large in deflection or the net height is influenced by traditional beams and columns can be solved. The sloping bottom step ladder beam structure arranged at the middle section of the large-span stair disperses and transmits the load of the large-span cast-in-place concrete slab stair, so that the calculated span of the stair section slab is reduced, the problem that the clear height is influenced due to the fact that the cross section of the stair beam is too high when the stair section is added with the stair beam is solved.

(2) The stair step beam adopts a step-shaped beam structure, the beam height is not more than the step height, the space of the lower part of the stair step is greatly saved, the requirement of the clear height of the stair under the condition of smaller floor height can be met, and the stair has better appearance because no beam is protruded during the span of the stair step plate.

Drawings

FIG. 1 is a schematic side sectional view of the present invention;

FIG. 2 is a schematic front view of the present invention;

FIG. 3 is a schematic diagram of the positions of the erected reinforcement and the stressed reinforcement of the present invention;

FIG. 4 is a schematic view of the stirrup construction of the present invention.

In the figure: 1, a slope bottom tread steel reinforcement framework; 1-1 longitudinal reinforcement group; 1-1-1 stressed steel bar; 1-1-2 erecting steel bars; 1-1-3 connecting the anchoring end; 1-2 hooping; 1-2-1 vertical stirrup; 1-2-2 transverse stirrups; 1-2-3 reinforcing lacing wires; 1-3 bottom slopes; 1-4, mounting a step surface; 1-5 lower step surface.

Detailed Description

The invention will be further described with reference to examples in the drawings to which:

the invention relates to a sloping-bottom step ladder beam structure for a large-span stair, which mainly comprises a sloping-bottom stair surface steel reinforcement framework (1) and a cement coating body (2), wherein the cement coating body (2) is attached to the sloping-bottom stair surface steel reinforcement framework (1); namely, the cement coating body (2) and the inclined bottom step surface steel reinforcement framework (1) are poured into a whole, and the cement coating body and the inclined bottom step surface steel reinforcement framework are adhered into a whole through cement to jointly form an inclined bottom step ladder beam structure.

The inclined-bottom trapezoidal-face steel reinforcement framework (1) comprises an inclined-bottom trapezoidal-face steel reinforcement framework frame body, a longitudinal steel reinforcement group (1-1) arranged on the inclined-bottom trapezoidal-face steel reinforcement framework frame body and stirrups (1-2) bound on the inclined-bottom trapezoidal-face steel reinforcement framework frame body, the section of the inclined-bottom trapezoidal-face steel reinforcement framework (1) is a trapezoidal inclined-bottom trapezoidal-face steel reinforcement cage, the bottom end of the section is an inclined plane, and the horizontal included angle of the inclined plane is beta; the horizontal included angle of the inclined plane at the bottom end of the cross section of the inclined-bottom tread steel reinforcement framework (1) is 28-30 degrees. The cement coating body (2) and the inclined bottom step surface steel reinforcement framework (1) are poured into a whole to form an inclined bottom step beam structure of an upper step surface (1-4) and a lower step surface (1-5). The distance between stirrups (1-2) bound on the inclined-bottom tread steel reinforcement framework in the longitudinal direction is 100 mm.

The longitudinal steel bar group (1-1) comprises a stressed steel bar (1-1-1), an erecting steel bar (1-1-2) and a connecting anchoring end (1-1-3); the stressed steel bars (1-1-1) are composed of 4 steel bars with the model number of HRB400, the numbers of the steel bars are respectively steel bars (i), (ii), (iii) and (iv) as shown in figure 3, and the steel bars are respectively arranged at the vertical projection positions of the erected steel bars (1-1-2) at the inclined bottom; the erection steel bars (1-1-2) are composed of 6 steel bars with the model number of HRB400, the number of the steel bars is (c), (b), (c) and (r) as shown in fig. 3), wherein the number of the steel bars is (c), (c) and (c), the four steel bars are arranged at the corner position of the upper end surface of the inclined bottom trapezoidal face steel bar framework (1) at intervals, the erection steel bar of the number steel bar (r) is positioned at the middle positions of the steel bar (c) and the steel bar (c), the main function of the steel bar (r) is to strengthen the bearing capacity of the lower step surface (1-5), the erection steel bar of the steel bar (c) is arranged at the middle section vertical surface position of the lower step side of the inclined bottom trapezoidal face steel bar framework, and the main function of the steel bar (r) is to strengthen the force bearing capacity; the connecting anchoring ends (1-1-3) are arranged at two ends of the cement coating body (2) and are formed by ends of longitudinal steel bar groups (1-1) or reserved steel bar sections, the length of the range of each side of the steel bar groups (1-1) extending out of the cement coating body (2) is 20d of a horizontal section, 15d of a bending section, and d is the diameter of the steel bar of the longitudinal steel bar 1-1.

The stressed steel bars (1-1-1) are composed of 4 steel bars and are respectively arranged at the vertical projection positions of the erected steel bars (1-1-2) at the inclined bottom; the erection steel bars (1-1-2) are composed of 6 steel bars, wherein four steel bars are arranged at the corner position of the upper end face of the inclined bottom stair surface steel bar framework (1) at intervals, and the other two erection steel bars (1-1-2) are respectively additionally arranged at the middle position of the lower stair surface (1-5) and the middle position of the vertical face of the lower stair side of the inclined bottom stair surface steel bar framework; the connecting and anchoring ends (1-1-3) are arranged at two ends of the cement coating body (2) and are composed of reserved steel bar sections of the longitudinal steel bar group (1-1). The length of the reserved steel bars of the longitudinal steel bar group (1-1) is 200 mm.

The stirrups (1-2) are formed by binding vertical stirrups (1-2-1), transverse stirrups (1-2-2) and reinforcing tie bars (1-2-3), and the stirrups are made of steel bars with the type of HRB 400. The length of the upper stepped surface (1-4) of the stirrup (1-2) is equal to 0.5 time of the length of the lower stepped surface (1-5), and the length of the lower stepped surface (1-5) is 270-280 mm; the reinforcement tie bars (1-2-3) are arranged perpendicular to the stepped surface (1-5) of the lower platform, the upper ends of the reinforcement tie bars (1-2-3) are bound and connected with the steel reinforcement (viii) in the erection steel reinforcements (1-1-2), and the lower ends of the reinforcement tie bars (1-2-3) are bound and connected with the steel reinforcement (viii) in the stressed steel reinforcements (1-1-1).

The reinforcing tie bars (1-2-3) are arranged perpendicular to the lower stepped surface (1-5), the upper ends of the reinforcing tie bars are bound and connected with the erection steel bars (1-1-2) in the middle of the lower stepped surface (1-5), and the lower ends of the reinforcing tie bars are bound and connected with 1 erection steel bar (1-1-2) of the upper end connection point in the projection position of the bottom inclined surface (1-3). The upper end of the reinforcing tie bar (1-2-3) is bound and connected with the steel bar (1-1-2) of the erection steel bar, and the lower end of the reinforcing tie bar (1-2-3) is bound and connected with the steel bar (1-1-1).

The invention discloses a using method of a sloping bottom step ladder beam structure for a large-span stair, which comprises the following steps:

connecting the longitudinal reinforcement group (1-1) and the stirrups (1-2) in a binding mode to form an inclined-bottom tread reinforcement cage (1) with the bottom end of the cross section being an inclined plane, and an inclined-bottom tread reinforcement cage with the upper end of the cross section being a trapezoid to form a framework of an inclined-bottom tread beam structure of the large-span stair;

placing the sloping bottom tread steel reinforcement framework (1) in a template of a stair section, and enabling the sloping bottom tread steel reinforcement framework (1) to be located in the middle of a stair structure; then, the top and bottom steel bars of the stair step plate penetrate through the inclined bottom stepping ladder beam steel reinforcement cage framework (1), the steel bars of the stair step plate are bound with the intersections of the first, second, third and fourth steel bars in the inclined bottom stepping ladder beam, and the steel bars of the stair step plate and the inclined bottom ladder face steel reinforcement cage framework are integrated through binding connection of the steel bars; after the reinforcing steel bars of the stair sections and the inclined bottom stair surface reinforcing steel bar frameworks (1) are bound, pouring concrete together, and wrapping to form a concrete wrapping body of the whole stair section, wherein the stair section plate reinforcing steel bars, the inclined bottom stair surface reinforcing steel bar frameworks (1) and the concrete wrapping body are adhered into a whole through concrete to jointly form a stair section structure additionally provided with an inclined bottom step ladder beam structure;

connecting and anchoring ends (1-1-3) at two ends of the inclined bottom tread steel reinforcement framework (1) and steel reinforcements in columns of the ladder column of the plate type stair structure are bound and connected, and then the inclined bottom tread steel reinforcement framework and the steel reinforcements are poured together by concrete and wrapped to form integral rigid connection; when the stair structure bears, the stair step plate transmits the load to the sloping bottom tread step beam structure, and the sloping bottom tread step beam structure transmits the load to the step post of the plate-type stair structure through the sloping bottom tread reinforcing steel bar framework (1) and the cement cladding body (2), and finally transmits the load to the frame structure of the building.