Rapid expansion grouting head device special for emergency grouting in subway tunnel hole

Abstract

The utility model discloses a special quick expansion grouting head device for emergency grouting in a subway tunnel hole, which comprises a hollow grouting head sleeve, a four-block external expansion sleeve body, a hexagonal fastening nut and a static mixer, an external expansion base is integrally arranged at the bottom of the hollow grouting head sleeve, the hollow grouting head sleeve is sleeved with the four-block external expansion sleeve body, and the hexagonal fastening nut is arranged at the bottom of the hollow grouting head sleeve. The upper portion of the hollow grouting head sleeve is in threaded connection with a hexagonal fastening nut through external threads, the hexagonal fastening nut abuts against the four-block external expansion sleeve body, the top of the hollow grouting head sleeve is detachably connected with the bottom end of a static mixer, and the top end of the static mixer is connected with a cement grout inlet connector. And one side of the static mixer is connected with a water glass inlet joint. According to the device, through the combination of a block external expansion structure, the hollow sleeve design and a modular assembly, rapid installation, high sealing performance and low-disturbance grouting of the grouting head are achieved, and the problems that in the prior art, efficiency is low, and the grout leakage risk is high are comprehensively solved.

Description

Technical Field

[0001] This utility model relates to the field of tunnel lining structure deformation repair technology, and in particular to a rapid expansion grouting head device for emergency grouting inside subway tunnels. Background Technology

[0002] With economic development and the continuous increase in subway operating mileage, more and more construction projects are being built near subway lines, and the scale of these projects is also increasing, inevitably causing significant deformation of subway tunnels. In recent years, the micro-disturbance grouting method, as a technique with minimal impact on the surrounding environment, high controllability, and good reinforcement effect, has become an important means of repairing subway tunnel deformation.

[0003] Settlement and convergence deformation are of particular concern in subway tunnel deformation. The repair method for settlement deformation typically involves drilling a hole downwards from the bottom of the tunnel, penetrating the tunnel segments, and then inserting grouting pipes into the underlying soil to lift and grout the tunnel. The repair method for convergence deformation typically involves vertically inserting grouting pipes from the ground at a certain distance on both sides of the tunnel, grouting the tunnel laterally, and reducing the tunnel's transverse diameter through the lateral pressure of the grout.

[0004] Over time, subway tunnels undergo varying degrees of longitudinal deformation in certain sections, leading to issues such as track bed separation from tunnel segments and tunnel leakage. The factors causing longitudinal deformation are complex, including those from the tunnel construction phase, those occurring after subway operation, those inherent to the system itself, and those caused by changes in the surrounding environment. These factors primarily manifest as: inadequate planning during construction or potential hazards left unaddressed during tunnel boring machine (TBM) advancement; differential settlement caused by long-term train operation vibrations; the impact of hundreds of new construction, renovation, and expansion projects, as well as municipal engineering projects, on the subway structure within the subway safety protection zone; and the increasing number of subway tunnels and underground pipelines crossing existing operational tunnels, causing differential settlement and other problems. If differential settlement in operational tunnels is not controlled promptly and allowed to develop, it will compromise the operational safety of the subway.

[0005] Currently used grouting methods include compaction grouting, jet grouting, and fracturing grouting. Although their construction methods differ, they all only specify the grouting volume and pressure parameters, without focusing on the fine-grained control of the grouting process. This may be sufficient for favorable geological or environmental conditions. Furthermore, existing grouting technologies often directly select borehole locations for a single protected object, failing to consider the complex surrounding environment. The borehole placement is relatively simple, and generally only the final grouting effect is considered, without regard to the disturbance during the grouting process. Therefore, the results are often counterproductive. Especially in situations with extremely high environmental protection requirements, particularly when deformation needs to be controlled within millimeter-level micro-ranges, important parameters such as grouting flow rate, number of grouting operations, and insertion / extraction speed will generate relatively significant self-disturbances. Therefore, the degree of precision in these parameters is crucial for achieving the construction control objectives.

[0006] For example, during construction, there are two types of grouting heads connected to grouting pipes. One type is a pre-reserved grouting hole in the lining segment, with the grouting head threadedly connected to the pre-reserved grouting hole. The other type is a water-drilled hole in the lining structure (lining segment) to install the orifice pipe (the orifice pipe is bonded to the lining structure with adhesive). The orifice pipe also needs to undergo water pressure sealing and pull-out tests the next day, which limits the flexibility of construction and affects the efficiency of on-site grouting construction.

[0007] In conclusion, it is necessary to design a rapid expansion grouting head device specifically for emergency grouting inside subway tunnels to solve the above problems. Utility Model Content

[0008] This utility model aims to provide a rapid expansion grouting head device for emergency grouting in subway tunnels, which can quickly improve the planting efficiency and effect of the grouting head and the segment lining structure, and improve the overall construction efficiency of micro-disturbance grouting reinforcement in the tunnel.

[0009] This utility model provides a rapid expansion grouting head device for emergency grouting in subway tunnels, comprising: a hollow grouting head sleeve, a four-part outer expansion sleeve body, a hexagonal fastening nut, and a static mixer. The bottom of the hollow grouting head sleeve is integrally provided with an outer expansion base. The hollow grouting head sleeve is fitted with a four-part outer expansion sleeve body. The upper part of the hollow grouting head sleeve is connected to a hexagonal fastening nut through an external thread. The hexagonal fastening nut is set to abut against the four-part outer expansion sleeve body. The top of the hollow grouting head sleeve is detachably connected to the bottom of the static mixer. The top of the static mixer is connected to a cement slurry inlet connector, and one side of the static mixer is connected to a water glass inlet connector.

[0010] In a preferred embodiment of this solution, the inner diameter of the expanded base is the same as the inner diameter of the hollow grouting head sleeve, the top of the outer diameter of the expanded base is the same as the outer diameter of the hollow grouting head sleeve, and the outer diameter of the expanded base gradually increases from top to bottom.

[0011] In a preferred embodiment of this solution, both the cement slurry inlet connector and the water glass inlet connector are externally threaded with emergency ball valves.

[0012] In a preferred embodiment of this solution, a groove is formed on the outer wall of the hollow grouting head sleeve and the corresponding quarter-section outer expansion sleeve body, and a boss is provided on the inner wall of the corresponding quarter-section outer expansion sleeve body, with the boss embedded in the groove.

[0013] Furthermore, 4-6 slots are evenly opened from the middle to the bottom of the side wall of the four-section outer expansion sleeve.

[0014] Implementing this utility model has the following beneficial effects:

[0015] This rapid expansion grouting head device, specifically designed for emergency grouting in subway tunnels, features quick installation and exceptional flexibility: its four-section outward expansion structure combined with threaded connection significantly reduces installation time, making it suitable for efficient emergency operations in confined spaces such as tunnels and mines; it also boasts excellent sealing and reliability: the dual function of the sealant and the four-section outward expansion structure effectively prevents grout leakage; an emergency ball valve provides flow control, reducing construction risks; and it features optimized micro-disturbance grouting: the hollow sleeve design reduces the vibration impact on the lining structure during grouting, improving grouting accuracy and uniformity, making it particularly suitable for areas with complex geological conditions or sensitive structures. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the external structure of the rapid expansion grouting head device for emergency grouting inside subway tunnels provided by this utility model;

[0018] Figure 2 A cross-sectional structural schematic diagram of the rapid expansion grouting head device for emergency grouting inside subway tunnels provided by this utility model;

[0019] Figure 3 A cross-sectional view of the connection structure between the four-section outer expansion sleeve body and the hollow grouting head sleeve;

[0020] In the figure: 1. Hollow grouting head sleeve, 2. Quarter-section outer expansion sleeve body, 3. Hexagonal fastening nut, 4. Static mixer, 5. Outer expansion base, 6. Groove, 7. Boss, 8. Slot, 9. Cement slurry inlet connector, 10. Water glass inlet connector, and 11. Emergency ball valve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-2 , Figure 1 A schematic diagram of the external structure of the rapid expansion grouting head device for emergency grouting inside subway tunnels provided by this utility model; Figure 2 A cross-sectional structural schematic diagram of the rapid expansion grouting head device for emergency grouting in subway tunnels provided by this utility model; the rapid expansion grouting head device for emergency grouting in subway tunnels includes: a hollow grouting head sleeve 1, a four-part outer expansion sleeve body 2, a hexagonal fastening nut 3, and a static mixer 4.

[0023] The bottom of the hollow grouting head sleeve 1 is integrally provided with an expanding base 5. The inner diameter of the expanding base 5 is the same as the inner diameter of the hollow grouting head sleeve 1. The top of the outer diameter of the expanding base 5 is the same as the outer diameter of the hollow grouting head sleeve 1, and the outer diameter of the expanding base 5 gradually increases from top to bottom.

[0024] The hollow grouting head sleeve 1 is fitted with a quarter-section expanded sleeve body 2. Specifically, a groove 6 is formed on the outer wall of the hollow grouting head sleeve 1 and the quarter-section expanded sleeve body 2, and a boss 7 is provided on the inner wall of the corresponding quarter-section expanded sleeve body 2. The boss 7 is embedded in the groove 6. Please refer to [link to relevant documentation]. Figure 3 , Figure 3 This is a cross-sectional view of the connection structure between the quarter-section expanded sleeve body and the hollow grouting head sleeve. In addition, 4-6 slots 8 are evenly opened from the middle to the bottom of the side wall of the quarter-section expanded sleeve body 2.

[0025] The upper part of the hollow grouting head sleeve 1 is connected to a hexagonal fastening nut 3 by an external thread, and the hexagonal fastening nut 3 is set to abut against the quarter-section outer expansion sleeve body 2.

[0026] The top of the hollow grouting head sleeve 1 is detachably connected to the bottom of the static mixer 4. The top of the static mixer 4 is connected to the cement slurry inlet connector 9, and the side of the static mixer 4 is connected to the water glass inlet connector 10. Both the cement slurry inlet connector 9 and the water glass inlet connector 10 are externally threaded with emergency ball valves 11.

[0027] In use, first, a water drill is used to create a hole in the lining structure (the hole diameter is 1-2mm larger than the diameter of the hollow grouting sleeve base). After drilling, the hole diameter and depth are checked to ensure they meet design requirements. Then, sealant is evenly applied to the surface of the expanded base and the four-section expanded sleeve body. The expanded base and the four-section expanded sleeve body are installed into the hole, ensuring they are coaxial with the hole. The expanded sleeve body is then tightened with a nut to transmit pressure. Under this pressure, the bottom four-section of the expanded sleeve body expands outwards, adhering tightly to the lining structure (segment) hole wall. During this process, the sealant acts as a sealant (primarily filling the gaps between the hollow grouting head sleeve and the expanded sleeve body, and between the expanded sleeve body and the hole wall). After installation, a pull-out test is conducted on-site to verify the installation effect of the new type of grouting head for rapid grouting emergency repairs.

[0028] This rapid expansion grouting head device for emergency grouting in subway tunnels features a simple overall structure, flexible construction operation, and high safety and reliability. It enables rapid installation and fastening of the grouting head to the lining structure, increasing the installation flexibility during micro-disturbance grouting within the tunnel. This effectively shortens the installation time, optimizes the micro-disturbance grouting effect, and improves construction efficiency.

[0029] Applicable scenarios: Engineering scenarios requiring rapid grouting and with limited space, such as tunnel emergency reinforcement, subway lining repair, and mine water plugging.

[0030] Material and labor savings: The segmented, outward-expanding structure reduces the amount of sealing material used, and improved installation efficiency lowers labor costs. Based on similar technologies, similar improvements can save over 30% in material costs.

[0031] Shorter construction period: Compared with traditional grouting heads, the installation time is reduced by more than 50%, which is especially suitable for emergency rescue projects with high time requirements.

[0032] This device, through the combination of a segmented, outward-expanding structure, a hollow sleeve design, and modular components, achieves rapid installation of the grouting head, high sealing performance, and low-disturbance grouting, comprehensively solving the problems of low efficiency and high risk of grout leakage associated with traditional technologies. Its technical approach complements existing technologies (such as dual-liquid grouting end mixing devices and high-pressure grouting machines), and can be further integrated into a more efficient grouting system.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rapid expansion grouting head device specifically designed for emergency grouting inside subway tunnels, characterized in that, include: The device comprises a hollow grouting head sleeve, a four-section expanded sleeve body, a hexagonal fastening nut, and a static mixer. The hollow grouting head sleeve has an integrally formed expanded base at its bottom. The four-section expanded sleeve body is fitted over the hollow grouting head sleeve. A hexagonal fastening nut is threaded onto the upper part of the hollow grouting head sleeve via an external thread. The hexagonal fastening nut abuts against the four-section expanded sleeve body. The top of the hollow grouting head sleeve is detachably connected to the bottom of the static mixer. A cement slurry inlet connector is connected to the top of the static mixer, and a water glass inlet connector is connected to one side of the static mixer.

2. The rapid expansion grouting head device for emergency grouting inside subway tunnels according to claim 1, characterized in that, The inner diameter of the expanding base is the same as the inner diameter of the hollow grouting head sleeve, the top of the outer diameter of the expanding base is the same as the outer diameter of the hollow grouting head sleeve, and the outer diameter of the expanding base gradually increases from top to bottom.

3. The rapid expansion grouting head device for emergency grouting inside subway tunnels according to claim 1, characterized in that, Both the cement slurry inlet connector and the water glass inlet connector are externally threaded with emergency ball valves.

4. The rapid expansion grouting head device for emergency grouting inside subway tunnels according to claim 1, characterized in that, A groove is formed on the outer wall of the hollow grouting head sleeve and the corresponding quarter-section outer expansion sleeve body, and a boss is provided on the inner wall of the corresponding quarter-section outer expansion sleeve body, with the boss embedded in the groove.

5. The rapid expansion grouting head device for emergency grouting inside subway tunnels according to claim 4, characterized in that, The four-section outer expansion sleeve body has 4-6 slots evenly opened from the middle to the bottom of its side wall.

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