Grouting stopping structure suitable for grouting reinforcement of track bed in subway tunnel section

Abstract

The utility model provides a grouting stopping structure suitable for grouting reinforcement of a ballast bed in a subway tunnel section. The grouting stopping structure comprises a grouting hole, a grouting sleeve, a first grouting stopping plug, a second grouting stopping plug, a spring and a pressure relief pipeline. The grouting sleeve extends into the grouting hole and is used for grouting the grouting hole; the first stop-grouting plug is arranged at the front end of the grouting sleeve and used for sealing the interior of the grouting hole; the second stop-grouting plug is arranged at an opening of the grouting hole and used for sealing the opening of the grouting hole; the spring is mounted between the first stop-grouting plug and the second stop-grouting plug and is used for applying pressure to the second stop-grouting plug; the second stop-grouting plug is an air cavity type plug body or a liquid cavity type plug body, and the pressure relief pipeline is communicated with an inner cavity of the second stop-grouting plug and used for relieving sealing pressure of the second stop-grouting plug. The grout stopping structure has the advantages of being higher in grout stopping capacity and better in grouting stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to subway tunnel bed emergency processing technical field, specifically speaking, relate to a kind of grouting reinforcement for subway tunnel section bed, which is suitable for grouting structure. BACKGROUND

[0002] In construction engineering, more and more underground space engineering development in big city, especially subway construction technology develops rapidly, shield technology, mine method technology is more common in tunnel section, different stratum groundwater distribution characteristics are different, subway tunnel section length is generally about 2km, due to the erosion of groundwater, buoyancy effect, and vibration geologic structure produced by track vehicle operation, especially turning section exists greater centripetal force, long-term effect will produce structural damage, deformation to bottom plate, track plate, therefore, it needs to be reinforced regularly in these areas.

[0003] When grouting, due to different grouting depth, and groundwater has certain water pressure, use traditional grouting method, temporarily block the orifice, ensure sealing, use grouting pump to pressurize grouting, grouting effect is poor, sealing effect is poor when pressure increases, grouting leakage phenomenon is easy to appear, rock fissure eats grout instability.

[0004] The above engineering problem increases the difficulty of tunnel bed grouting reinforcement, to solve the above problems, a more suitable solution is needed. UTILITY MODEL CONTENT

[0005] The utility model aims at the deficiency of prior art, and provides a kind of grouting structure for subway tunnel section bed grouting reinforcement, which has stronger grouting capacity and better grouting stability.

[0006] To achieve the above object, the technical scheme adopted by the utility model is as follows: a kind of grouting structure for subway tunnel section bed grouting reinforcement, including grouting hole, grouting sleeve, first grouting plug, second grouting plug, spring and pressure relief pipeline;

[0007] The grouting sleeve extends to the inside of the grouting hole, for grouting into the grouting hole;

[0008] The first grouting plug is arranged at the front end of the grouting sleeve, for closing the inside of the grouting hole;

[0009] The second grouting plug is arranged at the mouth of the grouting hole, for closing the orifice of the grouting hole;

[0010] The spring is installed between the first grouting plug and the second grouting plug, for applying pressure to the second grouting plug;

[0011] The second grouting stopper is a gas cavity type or a liquid cavity type, and the pressure relief pipeline is communicated with the inner cavity of the second grouting stopper to unload the sealing pressure of the second grouting stopper.

[0012] Preferably, the first grouting stopper comprises a liquid cavity type stopper body enclosed by rubber material and containing sealing grease, and the inner end of the pressure relief pipeline is communicated with the inside of the liquid cavity type stopper body, and the outer end of the pressure relief pipeline is provided with a pressure relief valve and a pressure gauge.

[0013] Preferably, the second grouting stopper is a liquid cavity type stopper body, and a rubber stopper is arranged on the outer side of the second grouting stopper.

[0014] Preferably, the cavity for mounting the spring is a pressure regulating cavity, and the pressure regulating cavity is communicated with an external pressure regulating device through a pressure regulating gas pipe, and a control valve is arranged on the pressure regulating gas pipe.

[0015] Preferably, the grouting sleeve is a telescopic sleeve for adjusting the length.

[0016] Preferably, the first grouting stop valve and the second grouting stop valve are arranged outside the grouting sleeve.

[0017] Preferably, a rubber ring is further arranged outside the grouting sleeve.

[0018] Preferably, a grouting valve is connected to the outer side of the grouting sleeve.

[0019] Preferably, the diameter of the grouting hole is greater than or equal to 50 mm.

[0020] Preferably, the hole depth of the grouting hole is greater than or equal to 125 cm.

[0021] The utility model discloses relative prior art has substantial feature and progress, specifically speaking, the utility model on the basis of traditional pressurization, increase first grouting stopper, carry out one grouting at the certain depth in the hole, carry out two grouting at the hole mouth, and increase spring between two grouting stoppers, promote the grouting pressure of the first grouting stopper in the inside, and then promote the grouting capacity, make the grouting effect more stable.

[0022] Further, the space where the spring is arranged is a pressure regulating cavity, the cavity pressure is changed by increasing or decreasing the air pressure, the pressure control capacity is further enhanced, and the grouting effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structure schematic view of a grouting stop structure suitable for metro tunnel section bed grouting reinforcement in the utility model.

[0024] In the diagram: 1. Grouting hole; 2. Grouting sleeve; 3. Rubber ring; 4. First grout stop plug; 5. Rubber outer skin; 6. Pressure relief pipeline; 7. Spring; 8. Pressure regulating air line; 9. Second grout stop plug; 10. Rubber plug; 11. Control valve; 12. Grouting valve; 13. Pressure gauge; 14. Pressure relief valve. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0026] like Figure 1 As shown, a grout-stopping structure suitable for grouting reinforcement of track bed in subway tunnel sections includes a grouting hole 1, a grouting sleeve 2, a first grout-stopping plug 4, a second grout-stopping plug 9, a spring 7, and a pressure relief pipeline 6.

[0027] The grouting sleeve 2 extends into the grouting hole 1 and is used to inject grout into the grouting hole.

[0028] In this embodiment, the grouting sleeve 2 is designed as a telescopic sleeve structure. It can be used directly as a grouting pipeline or as a sleeve for a grouting pipeline. It can be adjusted according to the actual situation. The form of the telescopic sleeve can meet the needs of grouting holes of different depths. A grouting valve 12 is installed on its outside.

[0029] The first grout stopper 4 is located at the front end of the grouting sleeve 2 and is used to seal the inside of the grouting hole 1. Specifically, in this embodiment, the structure of the first grout stopper 4 is a liquid-cavity plug containing sealing grease, which is sealed by a rubber outer skin 5. The inside of the liquid cavity is connected to the outside through a pressure relief pipeline 6, and a pressure gauge 13 and a pressure relief valve 14 are installed on the pipeline. The sealing performance of the first grout stopper 3 is controlled by filling and discharging the liquid in the liquid cavity.

[0030] The second grout stopper 9 is disposed at the opening of the grouting hole 1 and is used to seal the opening of the grouting hole. In this embodiment, the second grout stopper 9 is also designed as a liquid cavity plug body with a rubber plug 10 installed on the outside. By utilizing the characteristics of the thicker rubber plug and stronger friction, the sealing of the opening is improved, while serving as the supporting foundation for the first grout stopper 4.

[0031] The spring 7 is installed between the first stop plug 4 and the second stop plug 9 to apply pressure to the second stop plug 9 and achieve pressurization.

[0032] To further enhance the pressure holding capacity, the cavity used to install the spring 7 is a pressure regulating cavity. The pressure regulating cavity is connected to an external pressure regulating device through a pressure regulating air pipe 8. A control valve 11 is installed on the pressure regulating air pipe. The grout stopping effect is enhanced by increasing the pressure, and the grout stopping device is removed by reducing the pressure.

[0033] To further improve the sealing performance, a rubber ring 3 is also provided on the outside of the grouting sleeve 2.

[0034] The structure is applicable to the grouting hole parameters: diameter ≥ 50mm, hole depth ≥ 125cm grouting hole.

[0035] The construction process of specific application:

[0036] 1) By drilling (water drilling) along the middle of the track bed with a concrete core drill, a 50mm diameter grouting hole is drilled until it penetrates the tunnel structure waterproof layer and stops, with a hole depth of about 125cm, without penetrating the primary support. One is set for each track bed plate, with a spacing of 4800cm.

[0037] 2) Since the track bed plate of the current uplift section needs to be completely removed and re-applied, the first grouting plug is controlled to be at least 5cm below the secondary lining concrete surface to avoid the grout adhering to the track bed and secondary lining structure, causing difficulty in subsequent plate removal.

[0038] 3) Grouting pressure: the grouting pressure is controlled to be not more than 0.05MPa. To prevent the track bed from rising again due to grouting, a grouting test is performed before grouting to determine the initial pressure for grouting. During subsequent formal grouting, the initial pressure is used first, and the pressure can be adjusted during the grouting process to ensure that the track bed plate is not lifted. Strengthen the monitoring of the track bed monitoring points during grouting to prevent secondary lifting.

[0039] 4) Grouting construction should be carried out after a certain number of core drilling is completed. While one hole is grouting, the other holes can be used as pressure relief and air outlet holes to prevent the track bed from lifting.

[0040] 5) Grouting process should be strengthened monitoring and on-site observation to avoid track bed lifting displacement or grout flow to outside the grouting range. When track bed lifting or tunnel deformation is found, grouting should be stopped immediately, analyze the reasons and develop relevant measures before continuing work.

[0041] 6) After grouting reinforcement is completed, the grouting hole in the track bed is permanently sealed with 5cm water leakage + 15cm epoxy mortar after the grout solidifies, and the track bed surface is cleaned.

[0042] Finally, it should be noted that: the above has made a detailed description of the preferred embodiments of the present patent, but the present patent is not limited to the above-mentioned embodiments, within the knowledge range of ordinary skill in the art, various changes can be made without departing from the purpose of the present patent.

Claims

1. A grouting stopping structure suitable for subway tunnel section track bed grouting reinforcement, characterized in that: The grouting hole, the grouting sleeve, the first grouting plug, the second grouting plug, the spring and the pressure relief pipeline are included. The grouting sleeve extends to the inside of the grouting hole and is used for grouting into the grouting hole. The first grouting plug is arranged at the front end of the grouting sleeve and is used for closing the inside of the grouting hole. The second grouting plug is arranged at the mouth of the grouting hole and is used for closing the hole mouth of the grouting hole. The spring is installed between the first grouting plug and the second grouting plug and is used for applying pressure to the second grouting plug. The second grouting plug is a gas cavity type plug body or a liquid cavity type plug body, and the pressure relief pipeline is communicated with the inner cavity of the second grouting plug and is used for unloading the sealing pressure of the second grouting plug.

2. The structure for stopping grouting according to claim 1, wherein: The first grouting plug includes a liquid cavity type plug body closed by rubber material and containing sealing grease, the inner end of the pressure relief pipeline is communicated with the inside of the liquid cavity type plug body, and the outer end of the pressure relief pipeline is installed with a pressure relief valve and a pressure gauge.

3. The structure for stopping grouting according to claim 2, wherein: The second grouting plug is a liquid cavity type plug body, and a rubber plug is arranged outside the second grouting plug.

4. The structure for stopping grouting according to claim 3, wherein: The cavity for installing the spring is a pressure regulating cavity, the pressure regulating cavity is communicated with external pressure regulating equipment through a pressure regulating gas pipe, and a control valve is installed on the pressure regulating gas pipe.

5. The structure for stopping grouting according to claim 4, wherein: The grouting sleeve is a telescopic sleeve and is used for adjusting the length.

6. The structure for stopping grouting according to claim 5, wherein: The first grouting plug and the second grouting plug are sleeved outside the grouting sleeve.

7. The structure for stopping grouting according to claim 6, wherein the structure is used for grouting reinforcement of a track bed in a metro tunnel section. A rubber ring is further arranged outside the grouting sleeve.

8. The structure for stopping grouting according to claim 7, wherein: A grouting valve is connected to the outside of the grouting sleeve.

9. The structure for stopping grouting according to claim 8, wherein: The diameter of the grouting hole is greater than or equal to 50 mm.

10. The structure for stopping grouting according to claim 9, wherein: The hole depth of the grouting hole is greater than or equal to 125 cm.

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