CN209760455U

CN209760455U - Stair sliding support with adjustable rigidity

Info

Publication number: CN209760455U
Application number: CN201920229235.6U
Authority: CN
Inventors: 毛范燊; 刘前曦
Original assignee: Architecture Design and Research Institute of Tongji University Group Co Ltd
Current assignee: Architecture Design and Research Institute of Tongji University Group Co Ltd
Priority date: 2019-02-21
Filing date: 2019-02-21
Publication date: 2019-12-10
Anticipated expiration: 2029-02-21

Abstract

the utility model discloses a stair sliding support with adjustable rigidity, which comprises a bracket and a bench plate; u-shaped bolt holes are formed in the bracket, and bolt holes are formed in the ladder section plates; bolts penetrate through bolt holes and U-shaped bolt holes arranged on the ladder section plates and are fixed through nuts; a spring is arranged in the U-shaped bolt hole; the spring is compressed between the bolt or the bolt and the wall of the bore. The utility model discloses a degree that the rigidity of adjustment spring, nut screwed and add damping fluid and change the contribution of bench board to the anti side rigidity of structure, can realize reducing the arrangement of reinforcement in the bench board is striden under the prerequisite that does not influence the anti side rigidity of overall structure.

Description

Stair sliding support with adjustable rigidity

Technical Field

the utility model relates to a stair sliding support, in particular to stair sliding support of adjustable rigidity.

Background

Generally, in order to improve efficiency in structural design, the stairs are not built into the model as lateral force resisting members, and sliding supports are used to separate the stair flight from the main structure.

The sliding support is adopted, so that the end part of the ladder section does not bear negative bending moment any more and becomes a component simply supported at two ends. Thus, to meet the specification limits on the deflection of the ramp panels, the reinforcement in the span of the ramp would be significantly increased. Especially for high-rise or super high-rise buildings, the number of stairs is large, which causes great waste of formed reinforcing steel bars.

for some reconstruction or extension projects, the original structure may not meet the requirements of the existing specifications or the building use function, the lateral stiffness of the structure needs to be quantitatively increased at the moment, and the stair flight plates are a good means for increasing the structural stiffness.

When the earthquake direction is parallel to the axis direction of the ladder beam, the ladder section plates transmit large shearing force to the corbels and the ladder beam, which is unfavorable for the stress of the overhanging corbels, and if the anchoring construction quality between the overhanging corbels and the ladder beam is poor, the shear crack is possibly formed between the ladder beam and the corbels, and even brittle shearing damage is generated. This is extremely disadvantageous for the stairs that are the traffic evacuation path when an earthquake comes.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model discloses a stair sliding support of adjustable rigidity can realize that two-way rigidity adjusts, releases the great shear force along terraced roof beam axis direction that the bench board transmitted when earthquake.

The technical scheme is as follows: a stair sliding support with adjustable rigidity comprises a bracket and a stair section plate; u-shaped bolt holes are formed in the bracket, and bolt holes are formed in the ladder section plates; bolts penetrate through bolt holes and U-shaped bolt holes arranged on the ladder section plates and are fixed through nuts; a spring is arranged in the U-shaped bolt hole; the spring is compressed between the bolt or the bolt and the wall of the hole.

Preferably, in order to realize bidirectional shock resistance, springs are arranged in the length direction and the width direction of the U-shaped bolt hole, so that the bolt is stressed in four positions in the length direction and the width direction of the U-shaped bolt hole.

preferably, in order to quantitatively change the rigidity of the ladder section plate, a steel plate is fixed between the U-shaped bolt hole and the nut, and damping fluid is added into the U-shaped bolt hole.

Preferably, the U-bolt hole is provided with a spring along the length direction.

When the ladder section plate and the main body structure are required to be rigidly connected, the U-shaped bolt holes and the gaps between the ladder section plate and the ladder beam are filled with fine aggregate concrete.

In order to make the spring installation more stable, the spring is welded on the screw rod of the bolt.

Has the advantages that: the utility model discloses compare in prior art its advantage lie in:

1. The efficiency can be improved when the structure is designed, and the stair is not built into a model as a lateral force resisting component;

2. The end part of the ladder section plate can bear negative bending moment while the lateral stiffness resistance of the whole structure is not influenced, the mid-span deflection is reduced, and the using amount of reinforcing steel bars is further reduced;

3. in a reconstruction or extension project, the rigidity coefficient of a spring can be changed by replacing the spring, the screwing degree of a nut in a bolt is changed, or damping fluid is added to accurately and quantitatively change the rigidity of the ladder section plate;

4. The rigid connection between the stair section plates and the integral structure of the stair can be realized by pouring fine stone concrete into the U-shaped holes and further screwing the nuts;

5. The constraint rigidity of the bracket to the bench plate can be changed by changing the distance between two bolts in the U-shaped hole of the support or increasing the number of the bolts, so that the bending moment applied to the end part of the bench plate can be quantitatively increased or decreased;

6. The adjustable bidirectional rigidity can be realized, and the larger shearing force transmitted by the ladder section plates along the axis direction of the ladder beam during earthquake can be released.

Drawings

Fig. 1 is a front sectional view of the stair unidirectional sliding support of the utility model;

FIG. 2 is a top view of the unidirectional sliding support for stairs of the present invention;

fig. 3 is a front sectional view of the bidirectional stair sliding support of the present invention;

Fig. 4 is a top view of the bidirectional stair sliding support of the present invention;

Fig. 5 is a front sectional view of the rigid connection support of the stair of the present invention;

fig. 6 is a top view of the rigid connection support for stairs of the present invention;

fig. 7 is a construction process diagram of the present invention.

Detailed Description

as shown in fig. 1 to 4, a stair sliding support with adjustable rigidity comprises a bracket 1 and a stair section plate 2; the bracket 1 and the ladder beam 9 are integrally cast together; a plurality of U-shaped bolt holes 5 which are uniformly distributed along the width direction are formed in the bracket 1, and bolt holes are correspondingly formed in the ladder section plates 2; each U-shaped bolt hole 5 corresponds to the bolt holes on the two stepped plates 2; the bolts 3 penetrate through bolt holes arranged on the bench plate 2 and U-shaped bolt holes 5 and are fixed through nuts; a spring 4 is arranged in the U-shaped bolt hole 5; the spring 4 is compressed between the bolt 3 or the bolt 3 and the wall of the hole. The space between two bolts 3 of the U-shaped bolt hole 5 is changed or the number of the bolts 3 is increased, so that the constraint rigidity of the bracket 1 to the bench plate is changed, and the bending moment applied to the end part of the bench plate is quantitatively increased or decreased.

As shown in fig. 1-2, for the stair unidirectional sliding support, a spring is only required to be arranged along the length direction of a U-shaped bolt hole 5; a steel plate 8 is fixed between the U-shaped bolt hole 5 and the nut, and damping liquid 7 is added into the U-shaped bolt hole 5; the rigidity coefficient of the spring is changed by adjusting the replacement of the spring, and the screwing degree of a nut in a bolt is changed or damping fluid is added to accurately and quantitatively change the rigidity of the ladder section plate.

As shown in figures 3-4, for the bidirectional sliding support for the stairs, springs are arranged in the length direction and the width direction of the U-shaped bolt holes 5, so that the bolts 3 are stressed in four positions in the length direction and the width direction of the U-shaped bolt holes 5. And a steel plate 8 is fixed between the U-shaped bolt hole 5 and the nut, and damping liquid 7 is added into the U-shaped bolt hole 5.

As shown in fig. 5 to 6, when the ladder section plate 2 needs to be rigidly connected to the main structure, the U-shaped bolt holes 5 and the gap between the ladder section plate 2 and the ladder beam are filled with fine aggregate concrete 6.

In order to make the mounting of the spring 4 more stable, the spring 4 is welded to the shank of the bolt 3.

As shown in fig. 7, the construction method of the stair sliding support with adjustable rigidity comprises the following steps:

(1) When the bench slab 2 is poured, bolt holes are reserved in the horizontal section of the bench slab, as shown in fig. 7 (a);

(2) reserving a U-shaped bolt hole 5 when the bracket 1 is poured, as shown in the attached figure 7 (b);

(3) The ladder section plates 2 are hoisted in place, and 50-100 mm intervals are reserved between the ladder section plates 2 and the ladder beams to prevent the ladder section plates 2 from colliding with the ladder beams during earthquakes.

(4) And (3) passing the bolt 3 through the steel plate, the U-shaped bolt hole 5 and the reserved bolt hole of the ladder section plate, and screwing the nut.

(5) Installing the spring 4 and adding the damping fluid 7, as shown in figure 7 (c);

(6) When the ladder section plate is required to be rigidly connected with the main body structure, the spring 4 is taken down, damping liquid 7 is cleaned (or the damping liquid can be directly filled after being cleaned), and fine aggregate concrete 6 is filled in the U-shaped bolt holes 5 and gaps between the ladder section plate 2 and the ladder beam, as shown in a figure 7 (d);

(7) When two-way antidetonation is realized to needs, widen the bolt hole to all set up spring 4 along 5 length direction of U-shaped bolt hole and width direction, and add damping fluid 7.

Claims

1. A stair sliding support with adjustable rigidity comprises a bracket (1) and a stair section plate (2); the method is characterized in that: the bracket (1) is provided with a U-shaped bolt hole (5), and the ladder section plate (2) is provided with a bolt hole; the bolts (3) penetrate through bolt holes arranged on the ladder section plates (2) and U-shaped bolt holes (5) and are fixed through nuts; a spring (4) is arranged in the U-shaped bolt hole (5); the spring (4) is compressed between the bolt (3) or the bolt (3) and the hole wall.

2. the adjustable stiffness stair shoe according to claim 1, wherein: u-shaped bolt hole (5) length direction and width direction all are equipped with the spring for four positions of bolt (3) along U-shaped bolt hole (5) length direction and width direction all receive the force.

3. the adjustable stiffness stair shoe according to claim 1, wherein: and a steel plate (8) is fixed between the U-shaped bolt hole (5) and the nut, and damping liquid (7) is added into the U-shaped bolt hole (5).

4. The adjustable stiffness stair shoe according to claim 1, wherein: the U-shaped bolt hole (5) is provided with a spring along the length direction.

5. the adjustable stiffness stair shoe according to claim 1, wherein: and the gaps between the U-shaped bolt holes (5) and the ladder section plates (2) and the ladder beams (9) are filled with fine aggregate concrete (6).

6. The adjustable stiffness stair shoe according to claim 1, wherein: the spring (4) is welded on a screw rod of the bolt (3).