CN201802976U - Tube push bench with telescopic anti-deflection wing - Google Patents

Abstract

Provided is a tube push bench with telescopic anti-deflection wings, which is capable of preventing the casing of the tube push bench from counter-rotating. The utility model is characterized in that two telescopic balance wings are symmetrically disposed at the two sides of the casing of the tube push bench head.

Description

Push-bench with flexible anti-deflection wing

Technical field

The utility model relates to push-bench.

Background technique

The Operating torque of the knife cutting soil body relies on the casing of push-bench and the countertorque of surrounding soil contact friction generation to realize equalising torque, to keep the excavation operation of push-bench steady and continuous.Usually, the Operating torque of the knife cutting soil body is to change along with the variation of soil structures; Simultaneously, owing to the variation of casing because of surrounding soil character, its contact condition also is not quite similar, and fricative countertorque also has nothing in common with each other.During because of fricative countertorque, soil body blocking cutterhead can not rotate between the cutterhead Operating torque is greater than casing and surrounding soil, and the casing reversal phenomenon appears in casing under the effect of driving force.

The model utility content

The purpose of this utility model is to provide a kind of push-bench with flexible anti-deflection wing, prevents that push-bench casing reversal phenomenon from taking place.

For realizing the push-bench of the flexible anti-deflection wing of having of described purpose, be characterized in, the bilateral symmetry of the head shell of push-bench be provided with telescopic balance wing.

When the push pipe head has right handed trend, the balance wing on right side can be subjected to the earth pressure that the soil body makes progress, the balance wing in left side can be subjected to downward earth pressure, and this a pair of reverse active force can form a moment that is rotated counterclockwise, thus the rotation of restriction push pipe head.

Description of drawings

Fig. 1 is the outline drawing that has under the push-bench working state of the flexible anti-deflection wing.

Fig. 2 is the fundamental diagram with push-bench of the flexible anti-deflection wing.

Embodiment

As shown in Figure 1, the suspension hook 1 of push-bench hooks on the Auxiliary Track 4, auxiliary guide rail is installed on the main orbit 3, main orbit 3 is installed on the guide rail 2 that is laid in the stratum, symmetry has been installed telescopic balance wing 5 respectively in the both sides of the housing of the head of push-bench, and the Operating torque of the cutterhead 6 cutting soil bodys of push-bench is to change along with the variation of soil structures; As shown in Figure 2, when the push pipe head has right handed trend, the balance wing 5 on right side can be subjected to the earth pressure that the soil body makes progress, the balance wing 5 in left side can be subjected to downward earth pressure, this a pair of reverse active force can form a moment that is rotated counterclockwise (among the figure shown in the dotted line), thus the rotation of restriction push pipe head.

Below be calculation specifications about balance wing 5 functions.

The suffered earth pressure of two balance wing is identical about supposing, the earth pressure of being born on each balance wing is calculated by passive earth pressure.

Then the Maximum Torque that can bear of the balance wing of push pipe both sides is

In the formula: M---the Maximum Torque that balance wing can be born, kNm;

γ---the unit weight of excavation ground layer soil body, kN/m ³, the following buoyant unit weight of pressing of level of ground water calculates;

H---ground is to cutterhead medial axis height, m;

The cohesion of c---the soil body, kPa;

---the angle of internal friction of the soil body, °.

The reactive torque that passes to fuselage during the push pipe rotation is made up of two-part: in (1) cutterhead rotary course, rub between its front and side and the soil body, produce the frictional resistance moment of torsion.(2) the stratum resisting moment in the knife cutting soil body process.

Cutterhead when rotated, the frictional resistance moment of torsion between its front and side and the soil body is

${\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="HSA00000264706700011.png"\; state="\{\{state\}\}">T</figure-callout>}}_1=\frac{\mathrm{\&pi;}{\mathrm{<figure-callout\; id="3"\; label="D"\; filenames="HSA00000264706700011.png"\; state="\{\{state\}\}">D</figure-callout>}}^3}{12}\mathrm{K\&mu;\&gamma;H}(1-w)+\frac{\mathrm{\&pi;}{\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="HSA00000264706700011.png"\; state="\{\{state\}\}">D</figure-callout>}}^2}{4}(1+k)\mathrm{\&mu;\&gamma;Ht}---(0-3)$

In the formula: D---cutter diameter, m;

K---the lateral earth pressure coefficient of excavation face, desirable (1.1～1.3) K ₀

The friction factor of μ---the cutterhead and the excavation face soil body;

γ---the unit weight of excavation ground layer soil body, kN/m ³, the following buoyant unit weight of pressing of level of ground water calculates;

H---ground is to cutter head of shield machine medial axis height, m;

W---cutterhead opening rate.

T---the width of cutterhead outer, m.

On the cutterhead of balancing earth-pressure shielding machine, arranged multiple cutter, as working angles, go ahead of the rest cutter, peripheral cutter, center cutter etc.Wherein, being mainly used in the cutter that cuts the soil body is working angles.Therefore, cutterhead stratum opposing moment of torsion in the process of the cutting soil body is:

In the formula: T _2i---the stratum drag moment of torsion of i during, kNm the Tool in Cutting soil body;

F _2i---the stratum drag that i is subjected to during the Tool in Cutting soil body, kN;

V---development machine fltting speed;

ω---cutterhead rotating speed;

β _i---i is the angle between the cutter of cutter and adjacent same trajectories;

w _i---i is the blade width of cutter;

α _i---i is the anterior angle of cutter.

With push-bench parameter and the formation parameter substitution formula (2-3)～(2-4) of inventor in the husky tight bridge branch line engineering of green grass, the Maximum Torque that the reactive torque of each push pipe fuselage and balance rotor can provide is for seeing Table 2-1.

Table 0-1 push pipe reactive torque and balance wing are born the torque arithmetic table

	T 1	T 2	T Instead	T Balance	T ±
						Moment of torsion (kN m)	622.4	31.4	653.8	438.5	215.3

Balance rotor maximum can be born 67% reactive torque.Because the balance rotor is arranged in push pipe head position, its moment of torsion of bearing can directly be offset the reactive torque of part, to reduce moment of torsion and the distortion that follow-up tube coupling is born.When push pipe jacking distance more in short-term, balance wing is fairly obvious for the effect of restriction push pipe rotation.

Claims (1)

1. have the push-bench of the flexible anti-deflection wing, it is characterized in that, the bilateral symmetry of the head shell of push-bench be provided with telescopic balance wing.

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