CN214793836U - Test earth pressure balance shield muck improvement prevents gushing test device - Google Patents
Test earth pressure balance shield muck improvement prevents gushing test device Download PDFInfo
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- CN214793836U CN214793836U CN202121210252.9U CN202121210252U CN214793836U CN 214793836 U CN214793836 U CN 214793836U CN 202121210252 U CN202121210252 U CN 202121210252U CN 214793836 U CN214793836 U CN 214793836U
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Abstract
The utility model discloses a test earth pressure balance shield constructs improvement of dregs and prevents gushing test device, include: the air compressor is communicated with one end of the connecting pipe, and an outlet of the air compressor is provided with an air outlet control valve; the liquid storage tank is internally added with a mixed liquid of the modifying agent and the muck, and compressed air is arranged at the upper part of the liquid storage tank; the cover plate is hermetically arranged at the top of the liquid storage tank, the cover plate is communicated with the other end of the connecting pipe and the inside of the liquid storage tank, and the connecting pipe is provided with an air inlet control valve at the cover plate; and the injection pipe comprises an imbibition straight pipe and a liquid outlet pipe, the lower end of the imbibition straight pipe is positioned in the mixed liquid, the upper end of the imbibition straight pipe is communicated with the liquid outlet pipe, the liquid outlet pipe is used for controlling the injection direction of the mixed liquid, and a liquid outlet pipe control valve is arranged on the liquid outlet pipe. The utility model discloses can test different modifier and prevent the improvement effect that gushes to the dregs under the different pressure, prevent gushing for the dregs improvement and provide the evaluation index.
Description
Technical Field
The utility model relates to an earth pressure balance shield tunnel engineering technical field. More specifically, the utility model relates to a test earth pressure balance shield constructs improvement of dregs and prevents gushing test device.
Background
Under the action of high water head pressure, in the process of tunneling by adopting an earth pressure balance shield, when a strong permeable stratum is met, the shield tunneling machine is very easy to gush due to the action of water pressure and underground water, and the gushing phenomenon is particularly caused to occur to the stratum such as fine sand, medium and coarse sand stratum, gravel, pebble, fractured zone rock stratum and the like.
At present, the common domestic gushing treatment method is to improve the slag soil and add a gushing prevention structure on the shield screw machine. In recent years, a plurality of students start from a shield screw machine structure, optimize and improve the screw machine by designing a slurry stopping plate or other specific structures, but consider that the method needs to redesign the original screw machine structure, the consumed time, the cost and the like are large, the screw machine structure is generally improved before tunneling, the lag exists in the verification of the anti-surging effect of the real water-rich sand layer, and the uncertain risk is large. At present, the measure for dealing with the gushing prevention of the water-rich sand layer in a construction site is mainly to add bentonite or high molecular polymer to improve the consistency, viscosity and workability of the slag, judge the slag improvement effect and mainly see the indexes of the improved slag, such as slump and the like, and the simulation and detection indexes aiming at the dynamic gushing effect are not researched, so that the intuitive evaluation of the modifier on the improvement and gushing prevention property of the slag under pressure cannot be verified.
Therefore, this application has designed a test device that simulation dregs gushed for detect different modifiers and prevent gushing improvement effect to the dregs, so that guide the scene better and carry out modifier variety and ratio selection, improve tunnelling efficiency and security.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a test earth pressure balance shield constructs dregs improvement and prevents gushing test device, can test different modifier and prevent the improvement effect that gushes to dregs under the different pressure, prevent for the dregs improvement that gushes and provide the evaluation index.
In order to realize according to the utility model discloses these objects and other advantages, provide a test earth pressure balance shield constructs improvement of dregs and prevents gushing test device, include:
the air compressor is communicated with one end of the connecting pipe, and an outlet of the air compressor is provided with an air outlet control valve;
the liquid storage tank is internally added with a mixed liquid of the modifying agent and the muck, and compressed air is arranged at the upper part of the liquid storage tank;
the cover plate is hermetically arranged at the top of the liquid storage tank, the cover plate is communicated with the other end of the connecting pipe and the inside of the liquid storage tank, and the connecting pipe is provided with an air inlet control valve at the cover plate;
and the injection pipe comprises an imbibition straight pipe and a liquid outlet pipe, the lower end of the imbibition straight pipe is positioned in the mixed liquid, the upper end of the imbibition straight pipe is communicated with the liquid outlet pipe, the liquid outlet pipe is used for controlling the injection direction of the mixed liquid, and a liquid outlet pipe control valve is arranged on the liquid outlet pipe.
Preferably, an air compressor pressure display meter is arranged at an outlet of the air compressor, and a liquid storage tank pressure display meter is arranged on the cover plate.
Preferably, a safety relief valve is further arranged on the cover plate of the liquid storage tank.
Preferably, the lower end of the liquid suction straight pipe is 2-3 cm away from the bottom of the liquid storage tank.
Preferably, the cover plate is tightly and tightly connected with the liquid storage tank through a plurality of bolts in a sealing manner.
Preferably, the cover plate has a through-opening in the center, which is sealed off by a sealing plug.
Preferably, the volume of the mixed liquid is two thirds of the volume of the liquid storage tank.
The utility model discloses at least, include following beneficial effect:
1. the utility model discloses make the soil pressure balance shield construct the improvement of dregs and prevent spouting the effect and convert the data parameter of experimental maneuverability, appraisal nature into.
2. The utility model discloses the device is convenient for carry out the evaluation directly perceived to the effect that the improvement stratum of amendment was prevented gushing, provides the shield and constructs dregs and prevent gushing improvement effect evaluation index.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of the overall structure of the testing device of the present invention;
fig. 2 shows a method for testing the testing device of the present invention.
Description of reference numerals:
1. the device comprises an air compressor, 2, an air compressor pressure display meter, 3, an air outlet control valve, 4, a connecting pipe, 5, an air inlet control valve, 6, a liquid storage tank pressure display meter, 7, a sealing plug, 8, a liquid outlet pipe, 9, a liquid outlet pipe control valve, 10, a bolt, 11, a safety relief valve, 12, a liquid suction straight pipe, 13, a liquid storage tank, 14, a cover plate, 15, compressed air, 16, a mixed liquid, 17 and a plastic measuring cup.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1, the utility model provides a test earth pressure balance shield constructs improvement of dregs and prevents gushing test device, include:
an air compressor 1 which communicates with one end of a connecting pipe 4, the air compressor 1 being provided with an air outlet control valve 3 at an outlet thereof;
a liquid storage tank 13, wherein a mixed liquid 16 of the modifying agent and the muck is added into the liquid storage tank 13, and compressed air 15 is arranged at the upper part of the liquid storage tank 13;
the cover plate 14 is arranged at the top of the liquid storage tank 13 in a sealing manner, the cover plate 14 and the liquid storage tank 13 are tightly and tightly connected in a sealing manner through a plurality of bolts 10, the cover plate 14 is communicated with the other end of the connecting pipe 4 and the inside of the liquid storage tank 13, and the connecting pipe 4 is provided with an air inlet control valve 5 at the cover plate 14; the cover plate 14 is provided with a through hole in the center, and the through hole is sealed and blocked by a sealing plug 7;
and the injection pipe comprises a liquid suction straight pipe 12 and a liquid outlet pipe 8, the lower end of the liquid suction straight pipe 12 is positioned in the mixed liquid 16, the upper end of the liquid suction straight pipe is communicated with the liquid outlet pipe 8, the liquid outlet pipe 8 is used for controlling the injection direction of the mixed liquid 16, and a liquid outlet pipe control valve 9 is arranged on the liquid outlet pipe 8.
An outlet of the air compressor 1 is provided with an air compressor pressure display meter 2, and a cover plate 14 is provided with a liquid storage tank pressure display meter 6.
In the technical scheme, the test device for testing the soil pressure balance shield muck improvement anti-gushing comprises a small air compressor 1(2.5P-18L), the maximum air pressure of the air compressor 1 can reach 1.0MPa, an air compressor pressure display meter 2 is arranged at an air outlet of the air compressor 1 and used for detecting the air pressure in the air compressor 1, and a gas outlet control valve 3 is additionally arranged behind the pressure meter and used for adjusting the gas outlet condition of the air compressor 1. The air outlet connecting pipe 4 of the air compressor 1 is connected with a liquid storage tank 13 (the volume is 3L), 2L of mixed liquid 16 of modifier and muck is added into the liquid storage tank 13, and the upper half part inside the liquid storage tank 13 is compressed air 15. The cover plate 14 of the liquid storage tank 13 is connected with three channels, the first channel is connected with the air compressor 1 and is used as an air inlet channel, a liquid storage tank pressure display meter 6 is arranged close to the cover plate 14 of the liquid storage tank 13 and is used for displaying the pressure of compressed air 15 in the liquid storage tank 13, and an air inlet control valve 5 is connected behind the pressure display meter and is used for controlling the air pressure in the liquid storage tank 13; the second channel is a safety pressure relief valve 11 of the liquid storage tank 13 and is used for pressure relief under special conditions; the third channel is a liquid outlet channel of the mixed liquid 16, a liquid suction straight pipe 12 is connected in the liquid storage tank 13, the bottom of the liquid suction straight pipe is 2-3 cm away from the bottom in the liquid storage tank 13, a liquid outlet pipe control valve 9 is connected outside the channel and used for controlling the liquid outlet condition of the mixed liquid 16 in the liquid storage tank 13 under the action of pressure, and a hard plastic pipe, namely a liquid outlet pipe 8, is connected outside the control valve and used for controlling the spraying direction of the mixed liquid 16, so that the subsequent judgment work of the spraying performance index is facilitated.
The working principle of the device is as follows: the air outlet control valve 3 for air compression, the air inlet control valve 5 of the liquid storage tank 13 and the liquid outlet pipe control valve 9 are closed, the small-sized air compressor 1 is opened to store a certain amount of compressed air 15 for standby, and the pressure value can be read from the air compressor pressure display table 2. Preparing modifier and muck mixed liquid 16 with different improving effects, filling the mixture into the liquid storage tank 13, and fastening a cover plate 14 of the liquid storage tank 13 by using a fastening bolt 10 to prevent air leakage. The tail end of the liquid outlet pipe 8 connected with the liquid storage tank 13 is fixed on the horizontal bracket. And opening the air outlet control valve 3 of the air compressor 1 and the air inlet control valve 5 of the liquid storage tank 13, and closing the air outlet control valve 3 of the air compressor and the air inlet control valve 5 of the liquid storage tank 13 when the pressure display meter 6 connected with the liquid storage tank reads that the pressure is required by working. Finally, the liquid outlet pipe control valve 9 is opened, the liquid outlet pipe control valve 9 is closed after a certain time t, and as shown in fig. 2, the spraying distance delta L of different mixed liquids 16 is measured1、ΔL2And the jet flow rate Q1、Q2And (3) the parameters are equal, wherein the average spraying flow rate v of the different mixed solutions 16 can be obtained by using the spraying flow rate Q, and the average spraying flow rate v is Q/t, so that the improvement effect of the different modifying agents on the slag soil gushing prevention is evaluated. The plastic measuring cup 17 is used for measuring the gushing flow of the mixed liquor 16 under different modifying agents.
This device size can be adjusted according to engineering actual need, different modifiers and modifier proportion under the different pressure circumstances can be surveyed to this device, the improvement effect that gushes is prevented to different sediment appearance grain size pairs dregs, especially join in marriage less sediment appearance to the grain size, and then acquire the evaluation that gushes the effect is prevented in more comprehensive dregs improvement, the required manpower of this experimental method is less simultaneously, this test work can be accomplished to 1 ~ 2 people in the experiment, the test device is simple simultaneously, convenience such as preparation processing, and device spare part etc. acquire conveniently, the low price, the expense that consumes is less. When the earth pressure balance shield construction process is carried out on a water-rich stratum, a soil body is often required to be subjected to a muck improvement test, the phenomenon of gushing of a screw conveyor is prevented, the improvement effect of modifying agents such as bentonite or high-molecular polymers on the anti-gushing of the shield muck can be well simulated by using the device, and visual evaluation indexes are provided for the improvement of the earth pressure balance shield muck on the anti-gushing.
The present embodiment is based on the principle of energy conservation, that is, the air energy provided by the air compressor 1 is converted into the kinetic energy of the mixed liquid 16 with different improvement effects during the testing process, and the kinetic energy is mainly reflected by measuring different spraying distances. The average flow velocity of the mixed liquor 16 can be calculated by measuring the difference of the spraying distances of the mixed liquor 16 with different improvement effects under the action of specific pressure and measuring the spraying flow rate of the mixed liquor 16 with different improvement effects in specific time under the action of specific pressure, so that the improvement effect of different modifying agents on the slag gushing can be judged.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (7)
1. Test earth pressure balance shield constructs improvement of dregs and prevents gushing test device, its characterized in that includes:
the air compressor is communicated with one end of the connecting pipe, and an outlet of the air compressor is provided with an air outlet control valve;
the liquid storage tank is internally added with a mixed liquid of the modifying agent and the muck, and compressed air is arranged at the upper part of the liquid storage tank;
the cover plate is hermetically arranged at the top of the liquid storage tank, the cover plate is communicated with the other end of the connecting pipe and the inside of the liquid storage tank, and the connecting pipe is provided with an air inlet control valve at the cover plate;
and the injection pipe comprises an imbibition straight pipe and a liquid outlet pipe, the lower end of the imbibition straight pipe is positioned in the mixed liquid, the upper end of the imbibition straight pipe is communicated with the liquid outlet pipe, the liquid outlet pipe is used for controlling the injection direction of the mixed liquid, and a liquid outlet pipe control valve is arranged on the liquid outlet pipe.
2. The improved anti-gushing test device for testing the soil pressure balance shield muck according to claim 1, wherein an air compressor pressure display meter is arranged at an outlet of the air compressor, and a liquid storage tank pressure display meter is arranged on the cover plate.
3. The improved anti-gushing test device for testing the soil pressure balance shield muck according to claim 1, wherein a safety relief valve is further arranged on a cover plate of the liquid storage tank.
4. The improved gush-proof test device for testing the soil pressure balance shield muck according to claim 1, wherein the lower end of the liquid suction straight pipe is 2-3 cm away from the bottom of the liquid storage tank.
5. The improved gush-proof test device for testing earth pressure balance shield muck according to claim 1, wherein the cover plate is tightly and tightly connected with the liquid storage tank through a plurality of bolts.
6. The improved gush-proof test device for testing earth pressure balance shield muck according to claim 1, wherein the cover plate has a through hole in the center, and the through hole is sealed and blocked by a sealing plug.
7. The improved gush-proof test device for testing earth pressure balance shield muck of claim 1, wherein the volume of the mixed liquid is two thirds of the volume of the liquid storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121210252.9U CN214793836U (en) | 2021-06-01 | 2021-06-01 | Test earth pressure balance shield muck improvement prevents gushing test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121210252.9U CN214793836U (en) | 2021-06-01 | 2021-06-01 | Test earth pressure balance shield muck improvement prevents gushing test device |
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| CN214793836U true CN214793836U (en) | 2021-11-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115901303A (en) * | 2022-11-14 | 2023-04-04 | 中国水利水电第三工程局有限公司 | Soil pressure balance shield that can simulate improver injection prevents gushing test device |
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2021
- 2021-06-01 CN CN202121210252.9U patent/CN214793836U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115901303A (en) * | 2022-11-14 | 2023-04-04 | 中国水利水电第三工程局有限公司 | Soil pressure balance shield that can simulate improver injection prevents gushing test device |
| CN115901303B (en) * | 2022-11-14 | 2023-09-19 | 中国水利水电第三工程局有限公司 | Soil pressure balance shield blowout prevention test device capable of simulating modifier injection |
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