Shield tunnel bag grouting sinking reducing and deviation rectifying system

Abstract

The utility model provides a sinking-reducing deviation-rectifying system for the grouting of a bag of a shield tunnel, which avoids the problems of grout runout and grout leakage in the traditional grouting method and ensures the high efficiency and reliability of grouting. The grouting sleeve is mounted in a tunnel structure; in the soil layer cutting stage, the rotary spraying drill rod is arranged in the grouting sleeve, an outlet of the rotary spraying drill rod is located in a soil body outside the tunnel structure, cutting materials are injected through an inlet of the rotary spraying drill rod, the cutting materials are sprayed out through the outlet of the rotary spraying drill rod, the soil layer of the tunnel structure is cut, and a soil layer cutting body is formed. Then, the rotary spraying drill rod is taken out of the grouting casing pipe; the bag grouting mechanism comprises a grouting guide pipe, a grouting floral pipe and a bag; the bag wraps and is fixed outside the grouting floral tube, and the grouting guide tube is connected with the grouting floral tube; in the grouting reinforcement stage, the bag is arranged in the soil layer cutting body, the grouting guide pipe is arranged in the grouting sleeve, grouting is conducted on the bag through the grouting guide pipe, and the bag is unfolded to form a grouting body.

Description

Technical Field

[0001] The utility model relates to a shield tunnel bag grouting sinking reduction and deviation correction system. Background Art

[0002] At present, with the acceleration of urbanization, the development of underground space is becoming more and more extensive. Due to its advantages such as high construction efficiency, small environmental impact and strong adaptability, shield tunnels have been widely used in municipal pipe corridors, transportation, water conservancy and other fields, especially in soft soil areas. Due to the influence of long-term tunnel operation vibration, changes in engineering and hydrogeological environment, and the influence of surrounding construction, shield tunnels often cause uneven deformation, which is mainly manifested as structural settlement or horizontal displacement. If not dealt with, it will cause problems such as segment rupture, tunnel leakage, and poor operation smoothness, affecting the safety of tunnel use. At present, grouting is mostly used to repair damaged or leaking parts of the tunnel. The grouting range and grouting amount of traditional splitting or compaction grouting methods are uncontrollable, and slurry leakage and slurry leakage often occur, with low reliability. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a shield tunnel bag grouting settlement reduction and deviation correction system with a reasonable structural design, thereby avoiding the problems of grout running and leakage in traditional grouting methods and ensuring efficient and reliable grouting.

[0004] The technical scheme adopted by the utility model to solve the above-mentioned problems is: a shield tunnel bag grouting settlement reduction and deviation correction system, including a tunnel structure, characterized in that it also includes a grouting sleeve, a rotary jet drill rod and a bag grouting mechanism; the grouting sleeve is installed in the tunnel structure; in the soil layer cutting stage, the rotary jet drill rod is arranged in the grouting sleeve, and the outlet of the rotary jet drill rod is located in the soil outside the tunnel structure, and the cutting material is injected through the inlet of the rotary jet drill rod, and the cutting material is sprayed out through the outlet of the rotary jet drill rod to cut the soil layer of the tunnel structure to form a soil layer cutting body, and then the rotary jet drill rod is taken out from the grouting sleeve; the bag grouting mechanism includes a grouting conduit, a grouting flower tube and a bag; the bag is wrapped and fixed on the outside of the grouting flower tube, and the grouting conduit is connected to the grouting flower tube; in the grouting reinforcement stage, the bag is arranged in the soil layer cutting body, the grouting conduit is arranged in the grouting sleeve, the bag is grouted through the grouting conduit, and the bag is unfolded to form a grouting body.

[0005] The tunnel structure of the utility model is provided with a through hole, and the grouting sleeve is installed in the through hole of the tunnel structure.

[0006] The rotary jet drilling rod of the utility model is a hollow rod-shaped structure, and a jet hole is arranged at the outlet thereof.

[0007] The utility model discloses a grout return valve which is arranged in the middle of the rotary jet drilling rod.

[0008] The pouch described in the utility model is a flat pouch.

[0009] The utility model also comprises a grouting control pump, which is connected with the grouting conduit.

[0010] The utility model is provided with monitoring points in the tunnel structure.

[0011] Compared with the prior art, the utility model has the following advantages and effects:

[0012] 1. The utility model uses a bag in combination with a grouting pipe to confine the slurry in a bag of a certain shape. The bag can effectively limit the random flow of the slurry, avoid the slurry running and leakage problems of the traditional grouting method, and ensure the high efficiency and reliability of the grouting;

[0013] 2. As the bag is filled with grout and expanded, the utility model forms a grouting body, which can form a counter pressure on the existing tunnel structure, which can not only reinforce the soil layer around the tunnel, but also control the deformation of the tunnel;

[0014] 3. The utility model utilizes a rotary jet drill rod to cut the soil in the grouting area in advance, forming a loose layer in a certain area, thereby ensuring the expansion range and shape of the bag after grouting in the later stage, and ensuring the high efficiency and controllability of the bag's sinking reduction and deviation correction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1-Figure 4 It is a structural schematic diagram of the construction steps of an embodiment of the utility model.

[0016] Figure 5 It is a structural schematic diagram of the bladder bag grouting mechanism of an embodiment of the utility model.

[0017] Figure 6 It is a structural schematic diagram of a grouting body formed by a bag grouting mechanism in an embodiment of the utility model. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0019] The embodiment of the utility model comprises a tunnel structure 1, a grouting casing 2, a rotary jet drilling rod 3, a bag grouting mechanism 5, a grouting control pump 6 and a monitoring point 8.

[0020] The tunnel structure 1 may be a traffic or water conservancy tunnel, which is generally a prefabricated reinforced concrete structure, i.e., a concrete segment, or a steel segment, which is a whole ring or segmented assembly structure, and the segments are connected by bolts to form a complete tunnel structure.

[0021] The tunnel structure 1 can be drilled by drilling equipment to form a through hole, and the grouting sleeve 2 is installed in the through hole of the tunnel structure 1, so that the grouting sleeve 2 is installed in the tunnel structure 1. The grouting sleeve 2 is generally a steel sleeve with a hollow tubular structure, which has a sealing valve to prevent water and soil outside the tunnel from seeping into the tunnel.

[0022] The jet-jet drill rod 3 is a hollow rod-shaped structure, and a jet hole is provided at its outlet. In the soil layer cutting stage, the jet-jet drill rod 3 is arranged in the grouting sleeve 2, the inlet of the jet-jet drill rod 3 is located inside the tunnel structure 1, and the outlet is located in the soil outside the tunnel structure 1, and the inside of the tunnel structure 1 is driven into the soil outside the tunnel through the grouting sleeve 2. The cutting material mixed with high-pressure air, water or low-mix cement slurry is injected through the inlet of the jet-jet drill rod 3, and the cutting material is ejected through the outlet of the jet-jet drill rod 3 to cut the soil layer in a certain area outside the tunnel structure 1. After forming a loose soil layer cutting body 4, the jet-jet drill rod 3 is taken out from the grouting sleeve 2. A return slurry valve can be provided in the middle of the jet-jet drill rod 3 to absorb a small amount of cutting soil layer outside the tunnel, so as to form a loose layer in a certain area outside the tunnel, which is convenient for later grouting. The jet-jet drill rod 3 can also be used for cement jetting reinforcement of the distant soil outside the tunnel, and cutting of the nearby soil can enhance the back pressure effect of the later bag grouting.

[0023] The bag grouting mechanism 5 includes a grouting conduit 5.1, a grouting flower tube 5.2 and a bag 5.3; the grouting flower tube 5.2 is located at the front end, and the bag 5.3 is wrapped and fixed on the outside of the grouting flower tube 5.2. The bag 5.3 is a retractable, high-strength, high-tightness membrane structure. In this embodiment, the bag 5.3 is a flat bag; the grouting conduit 5.1 is connected to the grouting flower tube 5.2. In the grouting reinforcement stage, the bag 5.3 is set in the soil layer cutting body 4, the grouting conduit 5.1 is set in the grouting sleeve 2, and the bag 5.3 is grouted through the grouting conduit 5.1. As the grouting amount and grouting pressure increase, the bag 5.3 unfolds to form an ellipsoidal grouting body 7, which reinforces the surrounding area of ​​the tunnel structure 1 and forms a back pressure on the existing tunnel structure, which can not only realize the reinforcement of the soil layer around the tunnel, but also realize the control of tunnel deformation; the slurry can be cement, water glass or other fast-hardening slurry. When the bladder is driven into the outside of the tunnel structure, a temporary casing can be used for protection to avoid damage to the casing during the driving process.

[0024] The grouting control pump 6 is connected to the grouting conduit 5.1, and grouting is performed on the grouting conduit 5.1 through the grouting control pump 6. A monitoring point 8 is arranged in the tunnel structure 1, and the grouting control pump 6 can control different bag grouting mechanisms 5 through the tunnel deformation monitoring data transmitted by the monitoring point 8, so as to realize real-time grouting and real-time monitoring, and when the requirements are met, the grouting can be stopped, the grouting equipment can be removed, and the grouting sleeve 2 can be blocked as necessary.

[0025] The construction method in this embodiment has the following steps:

[0026] Step 1: After staking out the existing tunnel structure 1, drilling is performed on the tunnel structure 1 by means of a drilling device, and a grouting casing 2 is installed;

[0027] Step 2: See Figure 1 , inside the tunnel structure 1, a jet grouting drill rod 3 is driven into the soil outside the tunnel to a certain depth through a grouting casing 2, and a mixture of high-pressure air, water or low-mix cement slurry is sprayed at the end of the jet grouting drill rod 3 by using supporting equipment to cut the soil layer outside the tunnel structure 1 and form a loose soil cutting body 4 within a certain range;

[0028] Step 3: See Figure 2 , take out the jet-jet drill rod 3 and replace and install the bag grouting mechanism 5, drive the bag 5.3 at the end of the bag grouting mechanism 5 into the specified depth, and during the driving process, the bag 5.3 can be temporarily protected by an outer sleeve or other measures;

[0029] Step 4: See Figure 3 , the bag 5.3 at the end of the bag grouting mechanism 5 is grouted by the grouting control pump 6. As the grouting amount and grouting pressure increase, the bag 5.3 expands to form an ellipsoidal grouting body 7, which reinforces the surrounding area of ​​the tunnel structure 1. The grouting control pump 6 can control different bag grouting mechanisms 5 through the tunnel deformation monitoring data transmitted by the monitoring point 8, so as to realize real-time grouting and real-time monitoring until the grouting is completed;

[0030] Step 5: See Figure 4 , until the grouting is completed, the grouting equipment is dismantled, and the grouting casing 2 is blocked as necessary to restore the tunnel structure and normal operation;

[0031] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A shield tunnel bag grouting sinking reduction and deviation correction system, including a tunnel structure, characterized in that: It also includes a grouting sleeve, a rotary jet drill rod and a bag grouting mechanism; the grouting sleeve is installed in the tunnel structure; in the soil cutting stage, the rotary jet drill rod is arranged in the grouting sleeve, and the outlet of the rotary jet drill rod is located in the soil outside the tunnel structure, and the cutting material is injected through the inlet of the rotary jet drill rod, and the cutting material is sprayed out through the outlet of the rotary jet drill rod to cut the soil layer of the tunnel structure to form a soil cutting body, and then the rotary jet drill rod is taken out from the grouting sleeve; the bag grouting mechanism includes a grouting conduit, a grouting flower tube and a bag; the bag is wrapped and fixed on the outside of the grouting flower tube, and the grouting conduit is connected to the grouting flower tube; in the grouting reinforcement stage, the bag is arranged in the soil cutting body, the grouting conduit is arranged in the grouting sleeve, the bag is grouted through the grouting conduit, and the bag is unfolded to form a grouting body.

2. The shield tunnel bag grouting sinking reduction and deviation correction system according to claim 1 is characterized by: A through hole is arranged in the tunnel structure, and the grouting sleeve is installed in the through hole of the tunnel structure.

3. The shield tunnel bag grouting sinking reduction and deviation correction system according to claim 1 is characterized by: The jet-jet drill rod is a hollow rod-shaped structure, and a jet hole is arranged at its outlet.

4. The shield tunnel bag grouting sinking reduction and deviation correction system according to claim 1 is characterized by: A return slurry valve is arranged in the middle of the jet-jet drill rod.

5. The shield tunnel bag grouting sinking reduction and deviation correction system according to claim 1 is characterized by: The pouch is a flat pouch.

6. The shield tunnel bag grouting sinking reduction and deviation correction system according to claim 1 is characterized by: It also includes a grouting control pump, which is connected to the grouting conduit.

7. The shield tunnel bag grouting sinking reduction and deviation correction system according to claim 1 is characterized by: Monitoring points are provided within the tunnel structure.

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