CN105113778A - Hydraulic lifting platform - Google Patents

Abstract

The invention discloses a hydraulic lifting platform, comprising a hydraulic lift mounted on an upper lift point of a lifting platform beam. The hydraulic lift is connected with a temporary ball at a lower lift point of the lifting platform beam through a steel strand special for lifting; one side of the hydraulic lift is provided with a lateral support, a front pillar and a rear pillar are disposed below the lifting platform beam, the front pillar is disposed on one side close to the hydraulic lift, the rear pillar is disposed on the other side far away from the hydraulic lift, and the temporary ball is mounted below the lifting platform beam and faces the hydraulic lift. The hydraulic lifting platform has the advantages of low mounting cost and high construction efficiency, the platform is safe and reliable to construct, mounting construction difficulty is greatly decreased, and benefit is brought to quality, safety, construction period and the like.

Description

Hydraulic pressure lift platform

Technical field:

The present invention relates to a kind of hydraulic pressure lift platform, be mainly applicable to the suspension centre at truss support place, rack gate.

Background technology:

In engineer operation, large for span, highly high building, building lifting platform is one of first-selection of convenient construction, and suitable lifting platform must take into account cost, safety and easy construction.

Summary of the invention:

In order to solve the problem existing for background technology, the present invention is by the following technical solutions:

A kind of hydraulic pressure lift platform, comprises the hydraulic rockshaft being arranged on suspension centre on lifting platform beam, and described hydraulic rockshaft is by promoting special-purpose steel twisted wire and being arranged on the interim ball of suspension centre under landing beam and being connected; Described hydraulic rockshaft side is provided with lateral support frame, is provided with front column, rear column below described lifting platform beam, and described front column is located at the side near hydraulic rockshaft, and rear column is located at the side away from hydraulic rockshaft.

During lifting platform work, rear column front column, mainly by the pulling force of lifting platform beam, adopts the welding of secondary melt-through weld; Front column mainly by the pressure of lifting platform beam, therefore adopts fillet weld seam, and weld bead height is not less than 12mm.

It is low that the present invention has installation cost, the advantage that efficiency of construction is high, and operation platform is safe and reliable, greatly reduces installation difficulty, all favourable in quality, safety and duration etc.

Accompanying drawing illustrates:

Fig. 1 is hydraulic pressure lift platform structure elevation;

Fig. 2 is hydraulic pressure lift platform structure lateral view;

Fig. 3 is lifting platform calculation diagram.

Detailed description of the invention:

For certain experiment hall engineering, this hydraulic platform is arranged on the suspension centre at truss support place, rack gate:

A kind of hydraulic pressure lift platform, comprises the hydraulic rockshaft 1 being arranged on suspension centre on lifting platform beam 2, and described hydraulic rockshaft 1 is connected with the interim ball 5 being arranged on landing beam 2 times suspension centres by promoting special-purpose steel twisted wire; Described hydraulic rockshaft 1 side is provided with lateral support frame 6, is provided with front column 3, rear column 4 below described lifting platform beam 1, and described front column 3 is located at the side near hydraulic rockshaft 2, and rear column 4 is located at the side away from hydraulic rockshaft 2.

Lifting platform beam 1 selects the box-type section of B750 × 500 × 36, and front column 3 selects the box-type section of B500 × 500 × 24, and rear column 4 selects the steel pipe of D219 × 12.

During lifting platform work, rear column 4, mainly by the pulling force of lifting platform beam, adopts the welding of secondary melt-through weld; Front column 3 mainly by the pressure of lifting platform beam, therefore adopts fillet weld seam, and weld bead height is not less than 12mm.

Front column 3 is 0.58m with suspension centre (hydraulic rockshaft 2 installation site) distance, and rear column 4 is 2.80m with suspension centre distance.

Forcing checking:

Condition calculating is promoted according to roof grid structure, the maximum counter-force standard value of lifting suspension centre at lifting platform one place is 2552kN, dead load coefficient 1.35 is considered during lifting, dynamic load factor 1.2, lifter, interim suspender and steel strand etc. are considered according to 3.5t, promote maximum counter-force design load F=1.35 × 1.2 × (2552+10 × 3.5)=4191kN.

As shown in Figure 3, l=2.80m, a=0.85m in figure.

$R_A=F(1+\frac{a}{1})=4191\×(1+\frac{0.85}{2.80})=5463kN;$

$R_B=-\frac{F\×a}{l}=-1272kN$

M _max＝-F×a＝-3562kN·m

V _A＝-F＝4191kN

V _B＝-R _B＝1272kN

(1) lifting platform beam checking computations

Lifting beam cross section is B750 × 500 × 36, I _x=646204.65cm ⁴, W _x=17232.12cm ³, A=848.16cm ², S _x=7912.66cm ³, material is Q345B.

Flexural strength checking computations (A cross section):

$\frac{M_x}{{\mathrm{\&gamma;}}_x{W}_x}+\frac{M_y}{{\mathrm{\&gamma;}}_y{W}_y}=\frac{3562\&times;{10}^6}{1.05\&times;17232.12\&times;{10}^3}=197MPa<f=295MPa,$ Meet design requirement;

Shear Strength Calculation:

$\mathrm{\&tau;}=\frac{VS}{{\mathrm{It}}_w}=\frac{4191\&times;{10}^3\&times;7912.66\&times;{10}^3}{646204.65\&times;{10}^4\&times;2\&times;36}=71MPa<f_v=170MPa,$ Meet design requirement;

Resistance to overturning calculates:

Lifting platform lower flange of girder edge pressurized, the longest l of drift of compression flange ₁=850mm, width b ₁=500mm, then:

$\frac{h}{b_0}=\frac{750}{428}=1.75<6,\frac{l_1}{b_0}=\frac{850}{428}=2<95\sqrt{\frac{235}{345}}=78.4,$ Therefore do not need to calculate monolithic stability.

(2) front column checking computations

Front column specification is B500 × 500 × 24, max calculation length 1750mm, cross section property: A=45696mm ², i _x=i _y=194.57mm, material is Q345B, then strut slenderness ratio λ x=λ _y=L/i _y=8.99, φ _x=φ _y=0.9911, net section is long-pending than getting 0.9, considers that depression bar bearing capacity reduces coefficient η=0.785.Counter-force design load N _a=R _a=5463kN.

Strength checking

$\frac{N_A}{A_w\mathrm{\&eta;}}=\frac{5463\&times;{10}^3}{0.9\&times;45696\&times;0.785}=169MPa<f=295MPa$ Meet design requirement.

Stability Checking Calculation:

$\frac{N_A}{{\mathrm{\&phi;}}_{y}A\mathrm{\&eta;}}=\frac{5463\&times;{10}^3}{0.9911\&times;45696\&times;0.785}=153MPa<f=295MPa$ Meet design requirement.

(3) rear column checking computations

Rear column tension, pulling force design load T=R _b=1272kN, rear column specification is the steel pipe of D219 × 12, material Q345B, cross section property, A=7803.7mm ², net section is long-pending than value 0.9.Then:

$\frac{T}{A_w}=\frac{1128\&times;{10}^3}{0.9\&times;7803,7}=182MPa<f=310MPa$ Meet design requirement.

Claims (3)

1. a hydraulic pressure lift platform, is characterized in that, comprises the hydraulic rockshaft being arranged on suspension centre on lifting platform beam, and described hydraulic rockshaft is by promoting special-purpose steel twisted wire and being arranged on the interim ball of suspension centre under landing beam and being connected; Described hydraulic rockshaft side is provided with lateral support frame, front column, rear column is provided with below described lifting platform beam, described front column is located at the side near hydraulic rockshaft, rear column is located at the side away from hydraulic rockshaft, interim ball is arranged on below lifting platform beam, relative with hydraulic rockshaft position.

2. a kind of hydraulic pressure lift platform according to claim 1, it is characterized in that, lifting platform beam selects the box-type section of B750 × 500 × 36, and front column selects the box-type section of B500 × 500 × 24, and rear column selects the steel pipe of D219 × 12.

3. a kind of hydraulic pressure lift platform according to claim 1, is characterized in that, adopts secondary melt-through weld to weld between rear column with lifting platform beam; Adopt fillet weld seam between front column and lifting platform beam, weld bead height is not less than 12mm.