Small-section multi-angle hole curtain grouting device

Abstract

This invention belongs to the field of curtain grouting, specifically a small-section, multi-angle perforated curtain grouting device, comprising: a grout-stopping wall, cast at the tunnel face; several orifice pipes, pre-embedded inside the grout-stopping wall, one end of which is fixedly provided with a first flange and extends out of the outer end face of the grout-stopping wall, and the other end extends into the surrounding rock; and a retaining assembly, set on the first flange, including a second flange, a guide sleeve, and a straightening mechanism, wherein the second flange and the guide sleeve are coaxially arranged and fixedly connected to form a central channel for the drill rod and drill bit to pass through, the second flange and the first flange are detachably connected, and the straightening mechanism includes several sets of guide ribs evenly distributed along the circumference of the inner wall of the guide sleeve, each set of guide ribs having a wear-resistant liner fixedly provided on its inner side to constrain the swing of the drill rod.

Description

Technical Field

[0001] This invention relates to the field of curtain grouting, specifically a small-section, multi-angle perforated curtain grouting device. Background Technology

[0002] Curtain grouting is a construction method used when tunnels or inclined tunnels pass through water-bearing strata. It involves pouring a concrete grout-stopping wall at the tunnel face, pre-embedding orifice pipes, drilling holes in the surrounding rock through the orifice pipes, and injecting cement-based or cement-water glass double-liquid grout under high pressure. Under the grouting pressure, the grout spreads, fills, and solidifies along the fissures in the surrounding rock, thereby forming a continuous water-stopping curtain outside the tunnel excavation outline, which has the dual functions of water blocking and reinforcement.

[0003] In the prior art, such as Chinese patent CN119878246B, a method for multi-angle perforated curtain grouting with small cross-sections is disclosed. Its core innovation lies in the uniform arrangement of grouting pipes at different inclination angles under the bottom plate and within the outline of the inclined tunnel working section, thereby forming a multi-point grouting and water-blocking curtain outside the tunnel outline, ensuring that the grout diffuses to more angles, and realizing the engineering innovation of controlling large cross-section tunneling with small cross-section perforated grouting.

[0004] The aforementioned prior art has the following defects: In the curtain grouting construction of this patent, the orifice pipe needs to be pre-embedded in the grout stop wall with different downward angles and left and right deviation angles according to the design requirements of the drilling parameter table, so as to adapt to the need for multi-angle hole layout. However, in actual drilling construction, when the downward angle of the orifice pipe is small, the component of the drill rod's weight along the direction perpendicular to the axis of the orifice pipe is close to the total weight of the drill rod. Under its own weight, the drill rod is very easy to sag and press the bottom side of the inner wall of the orifice pipe. During the rotary drilling process, continuous friction and collision are generated, causing the drill rod to make direct contact with the inner wall of the orifice pipe or even repeatedly collide when passing through the orifice pipe, which will wear down the inner wall of the orifice pipe and damage its sealing surface.

[0005] Therefore, a small-section, multi-angle perforated curtain grouting device is proposed to address the above problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A small cross-section multi-angle perforated curtain grouting device of the present invention includes: a grout stop wall, cast at the tunnel face; several orifice pipes, pre-embedded inside the grout stop wall, one end of which is fixedly provided with a first flange and extends out of the outer end face of the grout stop wall, and the other end extends into the surrounding rock; a retaining component, set on the first flange, including a second flange, a guide sleeve, and a straightening mechanism, wherein the second flange and the guide sleeve are coaxially arranged and fixedly connected to form a central channel for the drill rod and drill bit to pass through, the second flange and the first flange are detachably connected, and the straightening mechanism includes several sets of guide ribs evenly distributed along the circumference of the inner wall of the guide sleeve, and a wear-resistant liner is fixedly provided on the inner side of each set of guide ribs to constrain the swing of the drill rod.

[0008] Preferably, the enclosure assembly further includes a stabilizing mechanism, comprising a plurality of locking blocks evenly distributed along the circumference of the outer wall of the second flange, a plurality of pairs of locking tongues, and an operating mechanism, wherein each pair of locking tongues is symmetrically slidably disposed inside each locking block, and a first elastic body is fixedly disposed between the locking tongues and the inner wall of the locking block; the operating mechanism is disposed on the locking block and is used to control a pair of locking tongues to slide synchronously into or out of the locking block; the outer wall of the first flange is provided with a plurality of through grooves that fit the shape of the locking blocks, and the inner wall of the through grooves is symmetrically provided with locking grooves that cooperate with the locking tongues.

[0009] Preferably, the control mechanism includes a pull rod, a synchronization plate, and a second elastic body, wherein the pull rod and the locking block are through-connected, one end of the second elastic body is connected to the outer wall of the pull rod, and the other end is connected to the inner wall of the locking block, the synchronization plate is connected to the end of the pull rod and slides in cooperation with the inner wall of the locking block, and the end of the synchronization plate facing the locking tongue is inclined.

[0010] Preferably, the control mechanism further includes a protruding key fixedly disposed on the outer wall of the pull rod; the inner wall of the locking block is provided with a keyway that fits with the protruding key; the pull rod and the synchronization plate are rotatably connected.

[0011] Preferably, the synchronizing plate has a groove on its inclined surface facing the locking tongue, and the end of the locking tongue has a follower that slides in cooperation with the groove.

[0012] Preferably, the control mechanism also includes a protrusion fixedly disposed on the outer wall of the pull rod, which facilitates the determination of the rotation phase of the pull rod.

[0013] Preferably, the enclosure assembly further includes a protective wall tube and a guiding mechanism, wherein the protective wall tube is coaxially fixed on the side of the second flange away from the guide sleeve and located inside the orifice tube, and the guiding mechanism includes a plurality of third elastic bodies evenly arranged along the circumferential direction of the outer wall of the protective wall tube, and a pair of guide rollers are symmetrically provided on the outer wall of the third elastic bodies.

[0014] Preferably, the enclosure assembly further includes a baffle fixedly disposed at the end of the wall-mounted pipe; the outer wall of the baffle is fixedly provided with a sealing ring, and the end edge away from the second flange is chamfered.

[0015] Preferably, the enclosure assembly further includes a plurality of handles fixedly disposed on the outer wall of the second flange; the plurality of handles are evenly arranged along the circumferential direction of the outer wall of the second flange.

[0016] Preferably, the first elastic body is a tension spring, the second elastic body is a compression spring, and the third elastic body is a leaf spring.

[0017] The advantages of this invention are: 1. The small-section multi-angle perforated curtain grouting device of the present invention, by setting guide ribs and wear-resistant pads, can form a full circumferential constraint on the drill rod passing through, restricting the radial swing of the drill rod caused by gravity during rotary drilling, so that the drill rod is centered and straightened at the inlet section of the borehole pipe, avoiding large-area hard contact and wear of the drill rod on the inner wall of the borehole pipe, extending the service life of the borehole pipe, and ensuring the sealing integrity of the borehole pipe during subsequent grouting operations.

[0018] 2. The small-section multi-angle perforated curtain grouting device of the present invention, by setting a locking tongue and a locking groove, after the locking block is inserted into the through groove of the first flange along with the second flange, the locking tongue automatically locks into the locking groove under the elastic force of the first elastic body, thereby realizing the axial locking of the retaining component and the orifice pipe, so that the retaining component is temporarily fixed to the first flange, and can maintain stability without the need for continuous support by construction personnel, freeing up the hands of construction personnel and reducing the working intensity in the narrow space of the small section. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the main body of the present invention; Figure 2 This is a schematic diagram of the structure of the orifice pipe and enclosure assembly in this invention; Figure 3 This is a schematic diagram of the structure of the second flange in this invention; Figure 4 This is a schematic diagram of the structure of the protective tube in this invention; Figure 5 This is a schematic diagram of the card block structure in this invention; Figure 6 This is a schematic diagram of the locking tongue in this invention; Figure 7 This is a schematic diagram of the tie rod structure in this invention; Figure 8 This is a schematic diagram of the synchronization plate in this invention; Figure 9 This is a schematic diagram of the keyway structure in this invention; In the diagram: 1. Grout stop wall; 12. Orifice pipe; 13. First flange; 14. Second flange; 15. Guide sleeve; 16. Guide rib; 17. Wear-resistant gasket; 2. Locking block; 22. Locking tongue; 23. Locking groove; 24. First elastic body; 3. Tie rod; 32. Synchronizing plate; 33. Second elastic body; 4. Raised key; 42. Keyway; 5. Sliding groove; 52. Follower; 6. Protrusion; 7. Protective wall pipe; 72. Third elastic body; 73. Guide roller; 8. Baffle; 82. Sealing ring; 9. Handle. Detailed Implementation

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

[0022] Specific implementation examples are given below.

[0023] Please see Figures 1 to 9 As shown in the embodiment of the present invention, a small-section multi-angle perforated curtain grouting device includes: a grout-stopping wall 1, cast at the tunnel face; several orifice pipes 12, pre-embedded inside the grout-stopping wall 1, one end of which is fixedly provided with a first flange 13 and extends out of the outer end face of the grout-stopping wall 1, and the other end extends into the surrounding rock; a retaining component, set on the first flange 13, including a second flange 14, a guide sleeve 15, and a straightening mechanism, wherein the second flange 14 and the guide sleeve 15 are coaxially arranged and fixedly connected to form a central channel for the drill rod and drill bit to pass through, the second flange 14 and the first flange 13 are detachably connected, and the straightening mechanism includes several sets of guide ribs 16 evenly distributed along the circumference of the inner wall of the guide sleeve 15, and a wear-resistant pad 17 is fixedly provided on the inner side of each set of guide ribs 16 to constrain the swing of the drill rod; During construction, the grout stop wall 1 is poured at the tunnel face, serving as a load-bearing foundation to withstand grouting pressure and providing a pre-embedded positioning for the orifice pipe 12. The orifice pipe 12 is pre-embedded inside the grout stop wall 1, with its outer end, the first flange 13, extending out of the outer end face of the grout stop wall for connecting the retaining components. Its inner end extends into the surrounding rock, serving as a fixed channel for the drill rod and drill bit to enter the stratum. The retaining components are detachably connected to the first flange 13 via bolts through the second flange 14. The guide ribs 16 on the inner wall of the guide sleeve 15 and the wear-resistant liner 17 on its inner side form a circumferential constraint on the drill rod passing through, limiting the radial swing of the drill rod during rotary drilling and preventing the drill rod from directly rubbing against the inner surface of the orifice pipe 12. Furthermore, the inner diameter of the guide sleeve 15 is larger than the outer diameter of the drill pipe joint, which ensures that the drill pipe can pass smoothly through the guide sleeve 15 without excessive swaying. That is, the swing amplitude of the drill pipe is limited to a small range at the entrance, improving the centering degree of the drill pipe during drilling. By setting the guide ribs 16 and wear-resistant pads 17, the drill pipe passing through can be constrained in the entire circumference, limiting the radial swing of the drill pipe caused by gravity during rotary drilling. This ensures that the drill pipe is centered and straightened at the entrance section of the borehole pipe 12, avoiding large-area hard contact and wear of the drill pipe on the inner wall of the borehole pipe 12, extending the service life of the borehole pipe 12, and ensuring the sealing integrity of the borehole pipe 12 during subsequent grouting operations. In specific implementation, the wear-resistant liner 17 can be made of tin bronze, and the wear-resistant liner 17 and the guide rib 16 can be connected by screws to facilitate the replacement of the wear-resistant liner 17. Specifically, the wear-resistant liner 17 has a countersunk through hole along its length, and the guide rib 16 has a threaded blind hole at the corresponding position. The countersunk screw passes through the countersunk through hole and is threadedly connected to the threaded blind hole. In other words, during the curtain grouting construction of small-section tunnels, the orifice pipe 12 needs to be pre-embedded in the grout stop wall 1 at different downward and left / right angles according to the drilling design parameters. When the downward angle of the orifice pipe 12 is small (close to horizontal), the component of the drill rod's weight along the direction perpendicular to the axis of the orifice pipe 12 is close to the total weight of the drill rod, which easily generates continuous friction and collision during rotary drilling, wearing down the inner wall of the orifice pipe 12 and damaging its sealing surface. This application, by setting a guide sleeve 15 and several sets of guide ribs 16 and wear-resistant pads 17 inside, enables the drill rod to... The drill rod enters the orifice pipe 12 in a centered position. The guide ribs 16 are evenly distributed circumferentially along the inner wall of the guide sleeve 15, ensuring that the drill rod is constrained in all directions rather than just supported at the bottom. The wear-resistant pad 17 has a sliding contact with the drill rod but is made of a low-friction coefficient material (such as tin bronze). While ensuring the straightening effect, it reduces rotational resistance and solves the problem of wear on the inner wall of the orifice pipe 12 and drilling deviation caused by the drill rod sagging due to gravity in the case of small cross-section multi-angle hole layout. This extends the service life of the orifice pipe 12 and ensures the drilling accuracy of the grouting hole.

[0024] Please see Figures 5 to 8As shown, the enclosure assembly also includes a stabilizing mechanism, comprising several locking blocks 2 evenly distributed along the circumference of the outer wall of the second flange 14, several pairs of locking tongues 22, and a control mechanism. Each pair of locking tongues 22 is symmetrically slidably disposed inside each locking block 2, and a first elastic body 24 is fixedly disposed between the locking tongue 22 and the inner wall of the locking block 2. The control mechanism is disposed on the locking block 2 and is used to control a pair of locking tongues 22 to slide synchronously into or out of the locking block 2. The outer wall of the first flange 13 is provided with several through grooves that fit the shape of the locking blocks 2, and the inner wall of the through grooves is symmetrically provided with locking grooves 23 that cooperate with the locking tongues 22. When drilling inclined holes, especially at holes with smaller depression angle parameters, the corresponding pre-embedded component 13 tends to be more horizontal. Before bolts are tightened onto components 14 and 13, construction workers need to support the retaining components for an extended period to maintain stability, making construction more difficult. The stabilizing mechanism is used to achieve rapid mechanical locking between the enclosure component and the orifice pipe 12. In its natural state, the first elastic body 24 is compressed, and its elastic force drives a pair of locking tongues 22 to slide out of the locking block 2. The locking block 2 is fixedly installed on the outer wall of the second flange 14. During installation, it is inserted into the through groove of the first flange 13 along with the second flange 14. During this process, the locking tongues 22 can contact the first flange 13 and be squeezed into the inside of the locking block 2. When the locking block 2 reaches the predetermined position, the elastic force of the first elastic body 24 can drive the pair of locking tongues 22 to slide out from the inside of the locking block 2 and lock into the locking groove 23 on the inner wall of the through groove, thereby achieving axial locking between the enclosure component and the orifice pipe 12. This allows the enclosure component to... The enclosure component is temporarily fixed to the first flange 13, which optimizes the traditional situation where construction workers need to continuously support the enclosure component. The control mechanism is used to control the locking tongue 22 to retract into the locking block 2 synchronously when the enclosure component is disassembled, thereby releasing the lock. By setting the locking tongue 22 and the locking groove 23, after the locking block 2 is inserted into the through groove of the first flange 13 along with the second flange 14, the locking tongue 22 automatically locks into the locking groove 23 under the elastic force of the first elastic body 24, thereby achieving axial locking between the enclosure component and the orifice pipe 12. This allows the enclosure component to be temporarily fixed to the first flange 13, which can maintain stability without the need for continuous support from construction workers, freeing up the hands of construction workers and reducing the intensity of work in narrow spaces with small cross sections. In practice, the protruding end of the locking tongue 22 can be arc-shaped or wedge-shaped, and a guide chamfer should be provided at the entrance of the locking groove 23 to facilitate the smooth sliding of the locking tongue 22 into the locking groove 23 under the action of elastic force and avoid jamming.

[0025] Please see Figures 6 to 8 As shown, the control mechanism includes a pull rod 3, a synchronization plate 32, and a second elastic body 33. The pull rod 3 and the locking block 2 are connected through each other. One end of the second elastic body 33 is connected to the outer wall of the pull rod 3, and the other end is connected to the inner wall of the locking block 2. The synchronization plate 32 is connected to the end of the pull rod 3 and slides with the inner wall of the locking block 2. The end of the synchronization plate 32 facing the locking tongue 22 is inclined. In its natural state, the first elastic body 24 can also be in a stretched state, and its elastic force always points in the direction of the inward contraction of the locking tongue 22. The control mechanism is used to manually control the extension and retraction of the locking tongue 22. The pull rod 3 passes through the locking block 2, and its end is connected to the synchronous plate 32. The end of the synchronous plate 32 facing the locking tongue 22 is an inclined surface, which forms an inclined surface cooperation with the inner end of the locking tongue 22. This setting allows the locking tongue 22 to slide out of the locking block 2 in its natural state. When the construction worker presses the pull rod 3, the second elastic body 33 is in a compressed state. The synchronous plate 32 moves with the pull rod, and its inclined surface disengages from the locking tongue 22, causing the locking tongue 22 to contract inward due to the elastic force of the first elastic body 24, thereby causing the locking tongue 22 to disengage from the locking groove 23 to release the lock. After the pull rod 3 is released, the second elastic body 33 drives the pull rod 3 and the synchronous plate 32 to reset, and the locking tongue 22 re-extends under the squeezing action of the synchronous plate 32. In other words, considering the extremely limited space in small-section tunnels (typically only a few square meters in cross-sectional area), the operating space for construction workers when installing the retaining components is extremely narrow. They may need to continuously hold the retaining components with one hand and insert the bolts with the other hand, making the operation quite difficult. This invention achieves automatic temporary locking between the retaining components and the orifice pipe 12 through a stabilizing mechanism. During installation, after the locking block 2 is inserted into the through groove of the first flange 13 along with the second flange 14, the locking tongue 22 automatically engages with the locking groove 23 under the elastic force of the first elastic body 24, so that the retaining components are temporarily fixed to the first flange 13 before the connecting bolts are inserted. This allows construction workers to focus on the bolt insertion and tightening operations, reducing the difficulty and safety risks of installing retaining components in narrow spaces. When disassembling, construction workers can release the lock by pressing the pull rod 3, which is simple to operate and requires no special tools.

[0026] Please see Figure 7 and Figure 9 As shown, the control mechanism also includes a protruding key 4 fixedly disposed on the outer wall of the pull rod 3; the inner wall of the locking block 2 is provided with a keyway 42 that is clearance-fitted with the protruding key 4; the pull rod 3 and the synchronization plate 32 are rotatably connected. The convex key 4 is fixedly installed on the outer wall of the pull rod 3, and the keyway 42 is opened on the inner wall of the locking block 2. The two are in clearance fit. When the locking tongue 22 needs to be unlocked, the construction personnel can press the pull rod 3 until a pair of locking tongues 22 disengage from the locking groove 23. During the process, the convex key 4 slides along the keyway 42 and reaches the end of the keyway 42. Then the pull rod 3 can be rotated (such as deflected by 90°) so that the convex key 4 rotates at the end of the keyway 42 and is locked to another phase, thereby keeping the pull rod 3 and the locking tongue 22 in a disengaged state. The construction personnel do not need to continuously press the pull rod 3. This makes it convenient for the construction personnel to unlock several stable mechanisms in sequence. In specific implementation, such as Figure 9As shown, the keyway 42 includes a first straight section extending axially along the locking block 2, a second arc-shaped transition section connecting the end of the straight section, and a third locking straight section located at the end of the arc-shaped transition section and extending axially along the locking block 2. The first straight guide section extends axially along the locking block 2, and its width is slightly larger than the width of the convex key 4 (i.e., a mating clearance is provided). It is used to guide the convex key 4 to slide axially when the lever 3 is pressed. The length of this section corresponds to the axial travel of the lever 3 required for the latch 22 to switch from the extended state to the retracted state. The second section is an arc-shaped transition section, specifically a straight guide section. The arc-shaped groove at the end of the segment bends circumferentially, with an arc angle of 90°, which guides the convex key 4 to slide along the arc-shaped groove to the locking position during rotation. The third segment is the locking segment, with one end being a closed end and the other end connected to the arc-shaped transition segment. When the convex key 4 is screwed into the locking segment, the axial movement of the pull rod 3 is restricted, and the locking tongue 22 remains in the retracted state. During the unlocking operation, the convex key 4 slides along the straight section of the keyway 42 until the end of the locking segment. When the unlocking is held, the convex key 4 is located in the arc-shaped locking segment and can rotate, so that the convex key 4 and the keyway 42 form a locking, preventing the convex key 4 from coming out on its own.

[0027] Please see Figure 8 As shown, the synchronizing plate 32 has a groove 5 on its inclined surface facing the locking tongue 22, and the end of the locking tongue 22 is provided with a follower 52 that slides in cooperation with the groove 5; A groove 5 is provided on the inclined surface of the synchronization plate 32, and a follower 52 is provided at the end of the locking tongue 22. The follower 52 is embedded in the groove 5 and slides with it. When the synchronization plate 32 moves axially, the follower 52 slides along the groove 5, converting the axial displacement of the synchronization plate 32 into the radial displacement of the locking tongue 22. This can effectively constrain the movement trajectory of the end of the locking tongue 22 on the inclined surface of the synchronization plate 32 and prevent the locking tongue 22 from deviating or disengaging during the extension and retraction process.

[0028] Please see Figure 4 , Figure 7 , Figure 8 As shown, the control mechanism also includes a protrusion 6 fixedly installed on the outer wall of the lever 3, which facilitates the determination of the rotation phase of the lever 3; The protrusion 6 is fixedly installed on the visible section of the outer wall of the tie rod 3. The protrusion 6 and the key 4 are correspondingly installed in the circumferential position of the tie rod 3. That is, the construction personnel can determine the rotation state of the tie rod 3 by observing the direction of the protrusion 6. Specifically, with Figure 4 For example, when the end of the protrusion 6 is parallel to the circumferential direction of the second flange 14, it means that the protruding key 4 can slide in the keyway 42. When the end of the protrusion 6 is perpendicular to the circumferential direction of the second flange 14, it means that the protruding key 4 has been screwed into the holding position in the keyway 42.

[0029] Please see Figure 3 and Figure 4As shown, the enclosure assembly also includes a protective wall tube 7 and a guiding mechanism. The protective wall tube 7 is coaxially fixed on the side of the second flange 14 away from the guide sleeve 15 and located inside the orifice tube 12. The guiding mechanism includes several third elastic bodies 72 evenly arranged along the circumferential direction of the outer wall of the protective wall tube 7. A pair of guide rollers 73 are symmetrically provided on the outer wall of the third elastic body 72. The outer diameter of the protective tube 7 is smaller than the inner diameter of the orifice tube 12 and larger than the outer diameter of the drill rod. This can physically isolate the drill rod from the inner wall of the orifice tube 12. Even if the drill rod swings radially, it will only contact the inner wall of the protective tube 7 and will not directly wear the orifice tube 12. The elastic deformation of the third elastic body 72 can adapt to the inner diameter deviation and local deformation of the orifice tube. The guide roller 73 forms rolling contact with the inner wall of the orifice tube 12. During the continuous penetration of the protective tube 7, the sliding friction in the subsequent stroke can be converted into rolling friction, reducing the continuous thrust required for the protective tube 7 to be fully penetrated. When the enclosure component is installed, it can ensure that the protective tube 7 is always in the center position of the orifice tube 12, avoiding hard contact and friction between the outer wall of the protective tube 7 and the inner wall of the orifice tube 12. That is, considering that the orifice pipe 12 is relatively long (usually 2-5m), during the pre-embedding process, it is affected by the lateral pressure of concrete pouring and the shrinkage deformation caused by the heat of hydration, and its axis is prone to slight bending deformation. When the drill rod rotates at high speed through the bent orifice pipe 12, the drill rod generates a whipping effect in the bent section, which causes non-uniform impact wear on the inner wall of the orifice pipe 12. However, the present invention sets a protective wall tube 7 to be inserted into the orifice pipe 12, forming a physical isolation layer between the drill rod and the orifice pipe 12. Even if the orifice pipe 12 is bent and the drill rod swings inside, the drill rod will only contact the inner wall of the protective wall tube 7.

[0030] Please see Figure 3 and Figure 4 As shown, the enclosure assembly also includes a baffle 8 fixedly installed at the end of the wall-mounted pipe 7; the outer wall of the baffle 8 is fixedly provided with a sealing ring 82, and the end edge away from the second flange 14 is chamfered; The baffle 8 is fixedly installed at the end of the wall-mounted pipe 7. A sealing ring 82 is provided on its outer wall to form an annular seal with the inner wall of the orifice pipe 12, preventing high-pressure flushing fluid or slurry from flowing into the annular gap between the outer wall of the wall-mounted pipe 7 and the orifice pipe 12. This avoids contamination of the guiding mechanism by these slurries and ensures that flushing fluid and rock cuttings can only be discharged outward along the internal channel of the wall-mounted pipe 7. The edge of the baffle 8 away from the second flange 14 is chamfered, which plays a guiding role during the pipe insertion process, allowing the wall-mounted pipe 7 to be smoothly inserted into the orifice pipe 12.

[0031] Please see Figure 5 As shown, the enclosure assembly also includes a number of handles 9 fixedly disposed on the outer wall of the second flange 14; the number of handles 9 are evenly arranged along the circumferential direction of the outer wall of the second flange 14. In the narrow tunnel cross section, the manual installation of the retaining components is quite difficult. The handle 9 allows the construction workers to hold it with both hands and accurately align the second flange 14 with the first flange 13, while also facilitating fine-tuning of the angle during the installation process.

[0032] The first elastic body 24 is a tension spring, the second elastic body 33 is a compression spring, and the third elastic body 72 is a leaf spring; The first elastic body 24 and the second elastic body 33 are respectively selected from ordinary tension springs and compression springs, because the installation space at these two locations is relatively ample and the load-bearing capacity requirement is not high. The third elastic body 72 is selected from leaf springs, because the annular gap between the protective wall tube 7 and the orifice tube 12 is limited, and only leaf springs with extremely small axial dimensions can be arranged in it. The leaf springs can provide sufficient radial support force to keep the guide roller 73 tightly attached to the inner wall of the orifice tube 12. When installing each leaf spring, one end can be fixed to the outer wall of the protective wall tube 7 by welding or riveting, and the other end is a free end, that is, hinged to the outer wall of the protective wall tube 7. The main body of the leaf spring bulges outward along the radial direction of the protective wall tube 7 to form an arc-shaped structure, and the guide roller 73 is rotatably set on the top of the bulge of the leaf spring through a pin.

[0033] In summary, the workflow of this application is as follows: S1. Construction of grout-stopping wall and pre-embedding of orifice pipes At the tunnel face, steel bars are tied and formwork is erected. According to the drilling design parameters (hole position, depression angle, azimuth angle) for curtain grouting, the pre-embedded positions and angles of several orifice pipes 12 are precisely fixed on the formwork. Positioning brackets are used to fix the orifice pipes 12 at multiple points to ensure that they do not shift during the concrete pouring process. Then, the concrete of the grout stop wall 1 is poured and vibrated to compact it. After the grout stop wall 1 reaches the design strength, the pre-embedded fixing of the orifice pipes 12 is completed.

[0034] S2. Installation and fixing of enclosure components The enclosure assembly is moved to the working face. The construction worker holds the handle 9 and aligns the enclosure assembly with the pre-embedded orifice pipe 12, so that the wall protection pipe 7 is inserted along the axis of the orifice pipe 12. When the second flange 14 approaches the first flange 13, the locking block 2 is inserted into the through groove on the outer wall of the first flange 13, and the locking tongue 22 is compressed and retracted. After reaching the predetermined position, the locking tongue 22 automatically locks into the locking groove 23 under the elastic force of the first elastic body 24, temporarily fixing the enclosure assembly to the first flange 13. Then the construction worker inserts the connecting bolts to fasten the second flange 14 to the first flange 13, completing the rigid fixing of the enclosure assembly and the orifice pipe 12. S3, Drilling Construction The drill rod is passed through the central channel of the guide sleeve 15 and the wall protection pipe 7, and the drill bit extends to the surrounding rock in front of the tunnel face. The drilling rig drives the drill rod to rotate and drill. During this process, the guide ribs 16 and wear-resistant pads 17 on the inner wall of the guide sleeve 15 form circumferential constraints on the drill rod, limiting the radial swing of the drill rod caused by gravity. After drilling to the designed final hole depth, the drill rod and drill bit are withdrawn. S4. Removal of enclosure components After drilling to the designed final hole depth, remove the drill rod and drill bit, then press the pull rod 3, the inclined surface of the synchronous plate 32 disengages from the locking tongue 22, the locking tongue 22 retracts into the locking block 2 under the elastic force of the first elastic body 24, releasing the temporary lock, then loosen the connecting bolts, and pull the entire enclosure assembly out of the orifice pipe 12 and transfer it to the next hole position to repeat S2 to S4. S5, Curtain Grouting Construction After the retaining components are dismantled, a ball valve is installed at the end of the orifice pipe 12, and the grouting pipeline is connected. A water pressure test is carried out according to the design requirements. The grout mix ratio is selected according to the water absorption rate. The grouting is carried out in sections by retreating through cement grout. The grouting of the hole is ended after the final pressure is reached and stabilized for 15 minutes. After the drilling and grouting operations of all grouting holes are completed in sequence, a continuous multi-point staggered water-stop curtain can be formed outside the tunnel outline.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A small-section, multi-angle perforated curtain grouting device, characterized in that: include: Grout-stopping wall (1) is poured at the tunnel face; Several orifice pipes (12) are embedded inside the grout stop wall (1), with a first flange (13) fixed at one end and extending out of the outer end face of the grout stop wall (1), and the other end extending into the surrounding rock; The enclosure assembly, located on the first flange (13), includes a second flange (14), a guide sleeve (15), and a straightening mechanism. The second flange (14) and the guide sleeve (15) are coaxially arranged and fixedly connected to form a central channel through which the drill rod and drill bit pass. The second flange (14) and the first flange (13) are detachably connected. The straightening mechanism includes several sets of guide ribs (16) evenly distributed along the circumference of the inner wall of the guide sleeve (15). Each set of guide ribs (16) is fixedly provided with a wear-resistant pad (17) on the inner side to constrain the swing of the drill rod.

2. The small-section multi-angle perforated curtain grouting device according to claim 1, characterized in that: The enclosure assembly also includes a stabilizing mechanism, comprising several locking blocks (2) evenly distributed along the circumference of the outer wall of the second flange (14), several pairs of locking tongues (22), and an operating mechanism, wherein each pair of locking tongues (22) is symmetrically slidably disposed inside each locking block (2), and a first elastic body (24) is fixedly disposed between the locking tongue (22) and the inner wall of the locking block (2). The operating mechanism is disposed on the locking block (2) and is used to control a pair of locking tongues (22) to slide into or out of the locking block (2) synchronously. The outer wall of the first flange (13) is provided with several through grooves that fit the shape of the locking block (2), and the inner wall of the through grooves is symmetrically provided with locking grooves (23) that cooperate with the locking tongue (22).

3. The small-section multi-angle perforated curtain grouting device according to claim 2, characterized in that: The control mechanism includes a pull rod (3), a synchronization plate (32), and a second elastic body (33). The pull rod (3) and the locking block (2) are connected through each other. One end of the second elastic body (33) is connected to the outer wall of the pull rod (3), and the other end is connected to the inner wall of the locking block (2). The synchronization plate (32) is connected to the end of the pull rod (3) and slides with the inner wall of the locking block (2). The end of the synchronization plate (32) facing the locking tongue (22) is inclined.

4. The small-section multi-angle perforated curtain grouting device according to claim 3, characterized in that: The control mechanism also includes a protruding key (4) fixedly disposed on the outer wall of the pull rod (3); the inner wall of the locking block (2) is provided with a keyway (42) that is clearance-fitted with the protruding key (4); the pull rod (3) and the synchronization plate (32) are rotatably connected.

5. The small-section multi-angle perforated curtain grouting device according to claim 3, characterized in that: The synchronizing plate (32) has a groove (5) on its inclined surface facing the latch (22), and the end of the latch (22) is provided with a follower (52) that slides in cooperation with the groove (5).

6. The small-section multi-angle perforated curtain grouting device according to claim 3, characterized in that: The control mechanism also includes a protrusion (6) fixedly installed on the outer wall of the pull rod (3) to facilitate the determination of the rotation phase of the pull rod (3).

7. The small-section multi-angle perforated curtain grouting device according to claim 1, characterized in that: The enclosure assembly also includes a wall-mounted tube (7) and a guide mechanism. The wall-mounted tube (7) is coaxially fixed on the side of the second flange (14) away from the guide sleeve (15) and located inside the orifice tube (12). The guide mechanism includes several third elastic bodies (72) evenly arranged along the circumferential direction of the outer wall of the wall-mounted tube (7). A pair of guide rollers (73) are symmetrically arranged on the outer wall of the third elastic body (72).

8. The small-section multi-angle perforated curtain grouting device according to claim 7, characterized in that: The enclosure assembly also includes a baffle (8) fixedly installed at the end of the wall-mounted pipe (7); the outer wall of the baffle (8) is fixedly provided with a sealing ring (82), and the end edge away from the second flange (14) is chamfered.

9. A small-section, multi-angle perforated curtain grouting device according to claim 8, characterized in that: The enclosure assembly also includes a number of handles (9) fixedly disposed on the outer wall of the second flange (14); the number of handles (9) are evenly arranged along the circumferential direction of the outer wall of the second flange (14).

10. A small-section multi-angle perforated curtain grouting device according to any one of claims 1 to 9, characterized in that: The first elastic body (24) is a tension spring, the second elastic body (33) is a compression spring, and the third elastic body (72) is a leaf spring.

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