Rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement in subway tunnel hole

Abstract

The utility model discloses a rapid self-locking grouting orifice pipe device for micro-perturbation reinforcement in a subway tunnel hole, which comprises a hollow grouting sleeve, a slurry channel is arranged in the hollow grouting sleeve, the hollow grouting sleeve is sequentially sleeved with a first-section external expansion sleeve, a connecting sleeve, a second-section external expansion sleeve and a pressing sleeve from bottom to top, and the first-section external expansion sleeve, the connecting sleeve, the second-section external expansion sleeve and the pressing sleeve are connected through a bolt. The hexagonal compression nut is in threaded connection with the top end of the hollow grouting sleeve, the upper end and the lower end of the connecting sleeve are embedded connectors, the two ends of the connecting sleeve are connected with the first-section externally-expanded expansion sleeve and the second-section externally-expanded expansion sleeve respectively in an embedded mode, and the second-section externally-expanded expansion sleeve is connected with the compression sleeve in an embedded mode. The pressing sleeve abuts against the hexagonal pressing nut. According to the device, through the synergistic effect of mechanical locking, multi-section expansion and colloid filling, the problems that a traditional grouting orifice pipe is low in installation efficiency and unreliable in sealing are solved, and the device is particularly suitable for tunnel micro-disturbance grouting scenes. The application range is further expanded due to the modular design and the lightweight characteristic, and the device is an important technical innovation in the field of grouting construction.

Description

Technical Field

[0001] This utility model relates to the field of tunnel micro-disturbance grouting technology, and in particular to a rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement in 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 summary, it is necessary to design a rapid self-locking grouting port pipe device for micro-disturbance reinforcement inside subway tunnels to solve the above problems. Utility Model Content

[0008] The technical problem to be solved by this utility model is that the existing grouting head structure limits the flexibility of construction and affects the efficiency of on-site grouting construction. A new micro-disturbance reinforcement and rapid self-locking grouting orifice pipe device for subway tunnels is proposed.

[0009] To solve the above-mentioned technical problems, this utility model provides a rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement inside subway tunnels, comprising: a hollow grouting sleeve, a first-stage outward expansion sleeve, a connecting sleeve, a second-stage outward expansion sleeve, a clamping sleeve, and a hexagonal clamping nut; the hollow grouting sleeve is a hollow structure with openings at both ends, and a grout channel is provided inside it. The hollow grouting sleeve is fitted with a first-stage outward expansion sleeve, a connecting sleeve, a second-stage outward expansion sleeve, and a clamping sleeve in sequence from bottom to top. The hexagonal clamping nut is threaded to the top end of the hollow grouting sleeve. The upper and lower ends of the connecting sleeve are embedded joints. The two ends of the connecting sleeve are embeddedly connected to the first-stage outward expansion sleeve and the second-stage outward expansion sleeve, respectively. The second-stage outward expansion sleeve is embeddedly connected to the clamping sleeve. The clamping sleeve is set to abut against the hexagonal clamping nut.

[0010] In a preferred embodiment of this solution, a grouting sleeve base is integrally provided at the bottom end of the hollow grouting sleeve.

[0011] In a preferred embodiment of this solution, 4-6 slots are evenly distributed on the first and second sections of the expansion sleeve, and the first and second sections of the expansion sleeve are divided into 4-6 block structures through the 4-6 slots.

[0012] In a preferred embodiment of this solution, adhesive is filled between one section of the outward expansion sleeve, the connecting sleeve, the two sections of the outward expansion sleeve, and the hollow grouting sleeve.

[0013] Implementing this utility model has the following beneficial effects:

[0014] This subway tunnel micro-disturbance reinforcement quick self-locking grouting port pipe device features rapid self-locking and efficient installation: it achieves rapid locking through threads and mechanical extrusion, requiring no complex tools and significantly shortening installation time, making it particularly suitable for space-constrained scenarios such as tunnels; compared to traditional flange connections or rubber plug expansion, this design reduces disassembly steps and significantly improves work efficiency.

[0015] Multi-stage expansion seal: The dual-stage expansion sleeve design enhances sealing reliability, and combined with adhesive to fill the gaps, it effectively solves the problem of grout leakage during high-pressure grouting; moreover, this device achieves multiple seals through segmented expansion and adhesive filling.

[0016] Modular and lightweight: The components adopt standardized connections (embedded joints, threaded fit), which facilitates assembly and maintenance; compared with PVC overflow pipes or tunnel portal sealing structures, this device is more suitable for micro-disturbance grouting scenarios and is more flexible. Attached Figure Description

[0017] 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.

[0018] Figure 1 A schematic diagram of the structure of the rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement inside subway tunnels provided by this utility model;

[0019] Figure 2 A cross-sectional schematic diagram of a rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement inside a subway tunnel.

[0020] In the diagram: 1. Hollow grouting sleeve; 2. First-stage outward expansion sleeve; 3. Connecting sleeve; 4. Second-stage outward expansion sleeve; 5. Compression sleeve; 6. Hexagonal compression nut; 7. Grout channel; 8. Grouting sleeve base; 9. Groove; and 10. Embedded joint. 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 structure of the rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement inside subway tunnels provided by this utility model; Figure 2 This is a cross-sectional structural diagram of a rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement inside a subway tunnel. The rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement inside a subway tunnel includes: a hollow grouting sleeve 1, a first-stage outward expansion sleeve 2, a connecting sleeve 3, a second-stage outward expansion sleeve 4, a clamping sleeve 5, and a hexagonal clamping nut 6.

[0023] The hollow grouting sleeve 1 is a hollow structure with openings at both ends. It has a grout channel 7 inside and a grouting sleeve base 8 integrally installed at the bottom.

[0024] The hollow grouting sleeve 1 is fitted with an outer expansion sleeve 2, a connecting sleeve 3, a second outer expansion sleeve 4, and a compression sleeve 5 from bottom to top. The hexagonal compression nut 6 is threaded to the top end of the hollow grouting sleeve 1.

[0025] Specifically, the upper and lower ends of the connecting sleeve 3 are embedded joints 10. The two ends of the connecting sleeve 3 are respectively embeddedly connected to a first-section outward expansion sleeve 2 and a second-section outward expansion sleeve 4. The second-section outward expansion sleeve 4 is embeddedly connected to a clamping sleeve 5. The clamping sleeve 5 is set to abut against a hexagonal clamping nut 6.

[0026] The first-section expansion sleeve 2 and the second-section expansion sleeve 4 are evenly provided with 4-6 slots 9, and the first-section expansion sleeve 2 and the second-section expansion sleeve 4 are divided into 4-6 block structures through the 4-6 slots 9.

[0027] To achieve a better sealing effect, adhesive is filled between the first section of the expansion sleeve 2, the connecting sleeve 3, the second section of the expansion sleeve 4, and the hollow grouting sleeve 1.

[0028] The components of this device achieve rapid self-locking through insert-type connections and threaded fits.

[0029] Hollow grouting sleeve: The hollow interior serves as a grout channel. The upper external thread connects to a hexagonal clamping nut, and the lower part connects to the expansion sleeve and connecting sleeve through the sleeve gap. Outwardly expanding sleeve: Divided into 4-6 sections by the slot, the two sections of the outwardly expanding sleeve expand radially after being compressed by the hexagonal nut, fitting snugly against the borehole wall to achieve a seal. Connecting sleeve: Transmits the compressive force to the bottom expansion sleeve, ensuring the synchronous operation of the two-section expansion structure. Clamping sleeve: Acts as a pressure transmission medium, converting the rotational force of the nut into the radial expansion force of the expansion sleeve.

[0030] Installation of the self-locking grouting orifice pipe device for micro-disturbance reinforcement in subway tunnels: First, drill a hole in the lining structure by hand (the hole diameter is 1-2mm larger than the diameter of the hollow grouting sleeve base). After drilling, apply adhesive to the lower part of the self-locking grouting orifice pipe (the expansion sleeve and connecting sleeve area). After applying the adhesive, install the self-locking grouting orifice pipe into the hole, ensuring it is coaxial with the hole position. Rotate the hexagonal clamping nut to compress and tighten the sleeve. The clamping sleeve transmits the compressive force to the lower outward expansion sleeve through the embedded connection structure. At the same time, the connecting pipe transmits the compressive force to the bottom outward expansion sleeve. Under the action of the compressive force, the outer surface structure of the two outward expansion sleeves expands and adheres tightly to the hole wall. During the process of adhering to the hole wall, the adhesive is applied to seal the hole (mainly filling the gaps between the hollow grouting sleeve, the outward expansion sleeve, the connecting sleeve, the clamping sleeve, and the hole wall). After installation, a pull-out test was conducted on-site to verify the installation effect of the self-locking grouting orifice pipe device.

[0031] This rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement in subway tunnels is suitable for scenarios requiring quick orifice pipe installation, such as tunnel lining reinforcement, micro-disturbance grouting in underground engineering, and sealing of rock and soil fissures. It offers improved performance by reducing grouting head installation time by over 50% and minimizing construction interference. Through the dual effects of colloid filling and expansion, it achieves a pull-out resistance of over 100KN and a sealing pressure of 2-5MPa, meeting the requirements of high-pressure grouting. Its lightweight structure (single unit weight <5kg) allows for flexible construction under complex conditions.

[0032] This device solves the problems of low installation efficiency and unreliable sealing of traditional grouting orifice pipes through the synergistic effect of mechanical locking, multi-stage expansion, and colloidal filling, making it particularly suitable for tunnel grouting scenarios with minimal disturbance. Its modular design and lightweight characteristics further expand its application scope, representing a significant technological innovation in the field of grouting construction.

[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 device for rapid self-locking grouting orifice pipe for micro-disturbance reinforcement inside a subway tunnel, characterized in that, include: The grouting sleeve comprises a hollow grouting sleeve, a first-stage outward expansion sleeve, a connecting sleeve, a second-stage outward expansion sleeve, a clamping sleeve, and a hexagonal clamping nut. The hollow grouting sleeve is a hollow structure with openings at both ends and a grout channel inside. From bottom to top, the hollow grouting sleeve is fitted with the first-stage outward expansion sleeve, the connecting sleeve, the second-stage outward expansion sleeve, and the clamping sleeve. The hexagonal clamping nut is threaded to the top end of the hollow grouting sleeve. The connecting sleeve has embedded joints at both ends, and its ends are embeddedly connected to the first-stage and second-stage outward expansion sleeves, respectively. The second-stage outward expansion sleeve is embeddedly connected to the clamping sleeve, and the clamping sleeve abuts against the hexagonal clamping nut.

2. The rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement inside subway tunnels according to claim 1, characterized in that, The bottom end of the hollow grouting sleeve is integrally provided with a grouting sleeve base.

3. The rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement inside subway tunnels according to claim 1, characterized in that, The first and second sections of the expansion sleeve are evenly provided with 4-6 slots, and the first and second sections of the expansion sleeve are divided into 4-6 block structures by the 4-6 slots.

4. The rapid self-locking grouting orifice pipe device for micro-disturbance reinforcement inside subway tunnels according to claim 1, characterized in that, Adhesive is filled between the first section of the expansion sleeve, the connecting sleeve, the second section of the expansion sleeve and the hollow grouting sleeve.

Images