CN102590481B - Method for testing shield tail sealing oil pumping characteristic of shield tunneling machine - Google Patents

Abstract

The invention discloses a device and a method for testing a shield tail sealing oil pumping characteristic of a shield tunneling machine, and is suitable for the technical field of shield tunneling construction. The device comprises an oil pump, a diaphragm pressure gauge and a pumping pipeline, wherein the pumping pipeline is connected with the outlet of the oil pump; and the diaphragm pressure gauge is communicated with the pumping pipeline. The device can be used for testing the pumping characteristics of different types of sealing oil, so that the quality of the pumping characteristics can be obtained. The invention has the beneficial effects that: the pumping characteristics of different types of sealing oil can be tested; the method is simple and feasible; a test result is accurate; the pumping characteristics of different types of sealing oil can be evaluated effectively; and important reference can be supplied to selection of shield tail sealing oil for the shield tunneling construction, so that the shield tunneling construction can be performed successfully.

Description

Shield tail sealing oil pumping characteristic of shield tunneling machine method of testing

Technical field

The present invention relates to Shield Construction Technique field, be specifically related to a kind of shield tail sealing oil pumping characteristic of shield tunneling machine proving installation and method of testing.

Background technology

In shield-tunneling construction, tail sealing is one of large sealing of shield machine three, its Main Function be by underground water, with material gears such as the synchronous grouting liquid of elevated pressures, earth outside shield machine, with prevent slime water infiltrate in shield machine body, produce dangerous.Tail sealing is between tail sealing brush, to fill with tail seal grease of shield; make to be full of close contact between the tail sealing brush of tail seal grease of shield and section of jurisdiction and realize the sealing of shield tail; tail seal grease of shield not only can effectively be filled the gap between tail sealing brush and section of jurisdiction; can also effectively protect tail sealing brush; make its resistance to oxidation, anticorrosive; can reduce the wearing and tearing between itself and section of jurisdiction simultaneously, effectively improve operating efficiency, guarantee construction safety.Therefore tail seal grease of shield is the core component of tail sealing.

The performance index of tail seal grease of shield mainly contain pumping, water pressure resistance, volatility, stability etc.Wherein pumping performance is particularly important, determining that can seal grease arrive smoothly tail sealing through transfer pipeline from shield machine utility appliance, the safety that is related to shield-tunneling construction, therefore before construction, the seal grease of different brands different model is carried out to the quality that pumping performance detects to evaluate its pumping, contribute to construction party to select the seal grease of high-quality as tail seal grease of shield, guarantee the reliability of tail sealing, thus the potential safety hazard that may bring while reducing construction.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of shield tail sealing oil pumping characteristic of shield tunneling machine proving installation and the method for testing that can test easily and effectively grease pumping performance quality, the method is simple and easy to do, test findings is accurate, can effectively evaluate the pumping performance of the grease of different brands model, for shield-tunneling construction, select tail seal grease of shield important references is provided, guarantee carrying out smoothly of shield-tunneling construction.

For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of shield tail sealing oil pumping characteristic of shield tunneling machine proving installation, comprises grease pump, diaphragm and pumping pipeline; One end of described pumping pipeline is connected with grease delivery side of pump, its other end opening; Described diaphragm is communicated with pumping line trackside portion.

The quantity of described diaphragm is more than 4.

Tail seal grease of shield pumping performance reacted grease while adopting grease pump to carry can transporting, be one of key property of tail seal grease of shield, grease pumping characteristic value is larger, pressure loss during conveying is larger, can pumping poorer, the mobility of grease be also poorer.

Utilize above-mentioned shield tail sealing oil pumping characteristic of shield tunneling machine proving installation to carry out the method for tail seal grease of shield pumping performance test, its concrete steps are as follows:

(1) in grease pump, fill with tail seal grease of shield;

(2) start grease pump, make its speed with 20ml/s carry out greasing to pumping pipeline, grease injection pressure is less than 2.5MPa, until tail seal grease of shield flows out from the mouth of pipe of pumping pipeline;

(3) when tail seal grease of shield steadily flows out from the mouth of pipe of pumping pipeline, close grease pump, stop greasing, when the mouth of pipe of pumping pipeline no longer flows out grease, record the measured force value of each diaphragm;

(4) quantity of establishing diaphragm is n, and wherein n is more than or equal to 4 positive integer; By diaphragm by numbering from the near to the remote and be respectively A apart from grease pump ₁, A ₂... A _n, the force value of corresponding each diaphragm is respectively P ₁, P ₂... P _n, establish diaphragm A ₁and A ₂between distance be L ₁, diaphragm A ₂and A ₃between distance be L ₂, the like, diaphragm A _nwith the distance of the pumping pipeline mouth of pipe be L _n, according to pumping performance formula, the pumping performance that can be detected tail seal grease of shield is:

;

(5) repeating step (2), to step (4) 6 times, obtains 6

value, then to described 6

value is averaged, and can obtain the pumping performance value of this kind of tail seal grease of shield;

(6) respectively different types of tail seal grease of shield is carried out to above-mentioned test, obtain respectively its corresponding pumping performance value;

(7) the pumping performance value of different types of tail seal grease of shield is compared, pumping performance value is less, and pumping is better.

The model that above-mentioned grease pump selects Shenzhen Zheng Feida Machinery Co., Ltd. to produce is the dense oily self-lubrication oil pump of NZ2.0SK/220.

Above-mentioned diaphragm is selected the Y-M of Shanghai Automation Meter Factory No. 4 series diaphragm, and range is 0-2.5MPa.

It is the hydraulic high-pressure oil pipe of 6.5mm that above-mentioned pumping pipeline is selected internal diameter.

Beneficial effect of the present invention is as follows: by a kind of tail seal grease of shield pumping performance proving installation and method of testing are provided, and provide the computing formula of grease pumping characteristic value, can realize the test to variety classes grease pumping performance, test method is simple and easy to do, test findings is accurate, can effectively evaluate the pumping performance of the grease of different brands model, for shield-tunneling construction, select tail seal grease of shield important references is provided, guarantee carrying out smoothly of shield-tunneling construction.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.

Fig. 1 is the principle schematic of shield tail sealing oil pumping characteristic of shield tunneling machine proving installation of the present invention;

Wherein, 1, grease pump, 2, diaphragm, 3, pumping pipeline.

Embodiment

Embodiment

As shown in Figure 1, shield tail sealing oil pumping characteristic of shield tunneling machine proving installation, comprises grease pump 1, diaphragm 2 and pumping pipeline 3; One end of described pumping pipeline 3 is connected with the outlet of grease pump 1, its other end opening; Described diaphragm 2 is communicated with pumping pipeline 3 sidepieces.The model that grease pump 1 selects Shenzhen Zheng Feida Machinery Co., Ltd. to produce is the dense oily self-lubrication oil pump of NZ2.0SK/220.Diaphragm 2 is selected the Y-M of Shanghai Automation Meter Factory No. 4 series diaphragm, and range is 0-2.5MPa, and its quantity is 4.It is the hydraulic high-pressure oil pipe of 6.5mm that pumping pipeline 3 is selected internal diameter, the outer glue-line of synthetic rubber of the synthetic rubber inner glue layer of resistance to liquid, steel wire braid, resistance to weather, consists of, and its overall length is 2 meters, is divided into four sections, 0.5 meter every section.

Utilize above-mentioned proving installation to carry out pumping performance test to first, second, the third three kinds of greases, detailed process is as follows:

First first kind grease is injected to grease pump, connect pumping pipeline and diaphragm, then open grease pump, pumping pipeline is carried out to greasing, grease injection pressure is less than 2.5MPa.When first kind grease steadily flows out from the mouth of pipe of pumping pipeline, close grease pump, stop greasing.The outflow state of observing pumping pipeline mouth of pipe grease, when grease stops flowing out, records the force value of four diaphragms, obtains following experimental data:

Fat type	Tensimeter A 1	Tensimeter A 2	Tensimeter A 3	Tensimeter A 4
					First	1.0MPa	0.74 MPa	0.51 MPa	0.26 MPa

After record, the pumping performance value that can be calculated first kind grease according to pumping performance computing formula is 0.493 * 10 ⁶pa/m.

Repeat above-mentioned steps 6 times, obtain 6 first kind grease pumping characteristic values, it is averaged, and record.

Then second kind grease and third kind of grease are tested according to above-mentioned steps respectively, and record data.

Finally the pumping performance value of the first and second the third three kinds of greases is compared, the grease pumping performance of pumping eigenwert minimum is best.

Claims (1)

1. a shield tail sealing oil pumping characteristic of shield tunneling machine method of testing, is characterized in that, method of testing adopts shield tail sealing oil pumping characteristic of shield tunneling machine proving installation to carry out, and it comprises grease pump (1), diaphragm (2) and pumping pipeline (3); One end of described pumping pipeline (3) is connected with the outlet of grease pump (1), its other end opening; Described diaphragm (2) is communicated with pumping pipeline (3) sidepiece, and the quantity of described diaphragm (2) is more than 4;

Its method step is as follows:

(1) in grease pump, fill with tail seal grease of shield;

(2) open grease pump, make its speed with 20ml/s carry out greasing to pumping pipeline, grease injection pressure is less than 2.5MPa, until tail seal grease of shield flows out from the mouth of pipe of pumping pipeline;

(3) when tail seal grease of shield steadily flows out from the mouth of pipe of pumping pipeline, close grease pump, stop greasing, when the mouth of pipe of pumping pipeline no longer flows out grease, record the measured force value of each diaphragm;

(4) quantity of establishing diaphragm is n, and wherein n is more than or equal to 4 positive integer; By diaphragm by numbering from the near to the remote and be respectively A apart from grease pump ₁, A ₂... A _n, the force value of corresponding each diaphragm is respectively P ₁, P ₂... P _n, establish diaphragm A ₁and A ₂between distance be L ₁, diaphragm A ₂and A ₃between distance be L ₂, the like, diaphragm A _nwith the distance of the pumping pipeline mouth of pipe be L _n, according to pumping performance formula, the pumping performance that can be detected tail seal grease of shield is: $\mathrm{\δ}=\frac{1}{n-1}\underset{i=2}{\overset{\mathrm{\π}}{\mathrm{\Σ}}}\frac{P_{i-1}-P_i}{L_{i-1}};$

(5) repeating step (2), to step (4) 6 times, obtains 6 δ values, then described 6 δ values is averaged, and can obtain the pumping performance value of this kind of tail seal grease of shield;

(6) respectively different types of tail seal grease of shield is carried out to above-mentioned test, obtain respectively its corresponding pumping performance value;

(7) the pumping performance value of different types of tail seal grease of shield is compared, pumping performance value is less, and pumping is better.

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