Advanced grouting pipe splicing construction method and casing pipe

Abstract

The invention belongs to the technical field of small tunnel construction, and particularly relates to an advanced grouting pipe splicing construction method and a casing pipe, and the method comprises the following steps: S1, excavating a working vertical shaft; s2, transverse advanced grouting is conducted on the first section; s3, excavating a first-section transverse channel; s4, mounting a transverse sleeve; s5, constructing a transverse channel; and S6, placing the pipeline. Soil in front of the vertical shaft and the channel is solidified through advanced grouting, the collapse risk in the excavation process is reduced, and construction safety is guaranteed; the process of circulating grouting, excavation and supporting is adopted, modular line production is formed, the method is suitable for excavation of small tunnels, and a series of problems caused by the fact that the whole road surface needs to be excavated when an underground pipe network is laid at present are solved; the working vertical shaft serves as an earthwork centralized transportation channel, and blocking of ground traffic caused by traditional open excavation is avoided; and finally, a pipeline is installed in the prefabricated transverse sleeve, it is ensured that the pipeline is accurately positioned and is prevented from being extruded by the stratum, and the engineering quality is improved.

Description

Technical Field

[0001] This invention belongs to the field of small tunnel construction technology, specifically a method for advanced grouting and pipe splicing construction and a casing. Background Technology

[0002] Pre-grouting is a key support and reinforcement technology for underground engineering projects such as tunnels and subways. It involves injecting cement grout or two-component grout into boreholes in front of or around the tunnel face. The grout fills the pores and fissures and solidifies to form a strong and impermeable reinforced curtain or water-stop barrier. This reinforces loose and broken surrounding rock, seals groundwater, controls stratum deformation, and creates a safe and stable working environment for subsequent construction in complex geological conditions such as water-rich strata and fault fracture zones.

[0003] Existing advanced grouting equipment is mostly used in large-scale tunnel projects. While these devices are advanced, highly automated, and efficient, they also have drawbacks such as high cost, inconvenience in movement, and large size, making them unsuitable for small tunnels or underground pipe construction. Current urban underground pipe network construction methods mostly employ pipe jacking, pipe pulling, and open-cut excavation, requiring road closures, occupying large areas, taking long periods, causing significant pollution, and leading to frequent complaints from residents and potential shutdowns. In particular, some construction areas, due to special circumstances such as geographical location, geological surveys, road infrastructure, or the presence of ancient buildings, cannot be excavated or are prohibited from excavation, necessitating alternative construction methods.

[0004] Chinese invention patent CN113309526B discloses a construction method for the excavation and support of a subway station arch, including the following steps: advanced geological prediction; construction of large pipe shed at the arch; construction of pilot tunnel; construction of central and side piles; grouting of small guide pipes at the arch; demolition of the arch; excavation and support of the arch; and construction of the end wall. However, this method uses large-scale excavation, which causes pollution and affects the normal lives of residents.

[0005] Chinese invention patent CN110307001B discloses a steel structure sleeve for trenchless construction, comprising a symmetrical upper semicircular body and a lower semicircular body with identical structures. Grouting hole bases are fixedly installed on both the upper and lower semicircular bodies. Angle steel B is fixedly connected to both sides of the upper semicircular body, and angle steel A, matching angle steel B, is fixedly connected to both sides of the lower semicircular body. Angle steel A and angle steel B are fixed together by connecting bolts. This invention, by setting grouting hole bases on the upper and lower semicircular bodies, allows cement mortar to be injected into the outer side of the upper and lower semicircular bodies during construction simply by connecting the grouting hole bases to grouting pipes, thus achieving grouting anchoring of the sleeve structure. This solves the technical problem of existing technologies that cannot grout during construction and can only grout after the entire line is installed. However, this sleeve is only for tunnel splicing, and the grouting construction sequence is: 1. Excavation first; 2. Installation of support sleeve; 3. Backfilling and grouting, which is excavation first, then grouting. However, the rock and soil in front of the excavation face and the top arch are prone to instability, landslides or even large-scale collapses during the excavation process due to loss of support or insufficient strength. Summary of the Invention

[0006] The purpose of this invention is to provide a method for advanced grouting and pipe splicing construction and a casing, which solves the problem that existing small tunnel construction does not have the conditions for excavation or the excavation risk is too high.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A method for constructing pipe splicing with advanced grouting includes the following steps: Step S1: Excavate the working shaft: At the selected location, perform grouting operations vertically downwards to solidify the soil in the area where the shaft to be excavated is to be solidified. Within the solidified soil area, excavate downwards to form the working shaft. Step S2, First-section transverse pre-grouting: At the predetermined excavation starting position at the bottom of the working shaft, construct a sealing wall; after the sealing wall is completed, use a water drill to drill holes in the sealing wall in the predetermined direction; through the drill holes, perform transverse grouting in the direction of passage advancement to solidify the soil in front of the first section of the planned excavation passage; Step S3: Excavate the first transverse passage: Excavate transversely within the first section of solidified soil area, and transport the excavated soil out through the working shaft to form the first transverse passage. Step S4, Horizontal Sleeve Installation: Place a horizontal sleeve in the first horizontal channel; a track is provided inside the horizontal sleeve, and a trolley is provided on the track, which can travel along the track; the water drill and drill bit are detachably fixed on the trolley. Step S5, construction of the transverse passage, including: Step S5.1, Lateral Advance Grouting of the Circulation Section: Move the trolley to the front end of the current channel working face, use the water drill on the trolley to drill holes in the direction of channel advancement, and perform lateral grouting in the direction of channel advancement through the drilled holes to solidify the soil in front of the next section of the channel to be excavated. Step S5.2, Excavate the transverse passage of the circulation section: Perform transverse excavation within the solidified soil area of ​​the circulation section, and transport the excavated soil out through the working shaft to form the transverse passage of the circulation section. Step S5.3: Place a new transverse sleeve in the transverse channel of the circulation section and connect two adjacent transverse sleeves; Step S5.4: The trolley moves along the track into the new transverse sleeve for subsequent operations; Step S5.5: Repeat steps S5.1 to S5.4 until the entire transverse passage is connected; Step S6: Place the pipelines: After the horizontal channel construction is completed, place the required pipelines inside the horizontal sleeve.

[0008] Preferably, in step S1, when excavating the working shaft, a steel structure vertical sleeve is installed for support after each section of excavation. Preferably, the vertical sleeve is composed of four arc-shaped steel plates connected by bolts, and the gaps around the outer periphery of the vertical sleeve are filled with grout.

[0009] Preferably, in step S2, a hole is drilled using a water drill, and grout is injected directly through the drill rod.

[0010] Preferably, in step S2, a pre-conduit is provided. The pre-conduit is made of steel pipe, and eyelets arranged spirally along the diameter of the steel pipe are drilled on the steel pipe. The front end of the pre-conduit is tapered and sealed.

[0011] Preferably, in step S4, the transverse sleeve includes an upper half and a lower half, which are connected by a connecting plate.

[0012] Preferably, the connecting plate includes a first connecting plate and a second connecting plate, the upper half pipe is fixedly connected to the first connecting plate, the lower half pipe is fixedly connected to the second connecting plate, and both the first connecting plate and the second connecting plate are provided with through holes, and the first connecting plate and the second connecting plate are connected by bolts.

[0013] In another aspect, the present invention provides an advanced grouting pipe splicing construction sleeve for the aforementioned advanced grouting pipe splicing construction method, comprising an upper pipe and a lower pipe. The inner sides of both ends of the upper pipe are fixedly connected to a first connecting plate, and the inner sides of both ends of the lower pipe are fixedly connected to a second connecting plate corresponding to the first connecting plate. Both the first connecting plate and the second connecting plate are provided with through holes, and a set of parallel tracks are fixedly connected inside the lower pipe. It also includes a trolley, the bottom of which is connected to a bracket, the bottom of which is rotatably connected to an axle, and wheels are fixedly connected to both ends of the axle. The wheels move on the track. A water drill is fixedly connected to the trolley, the rear end of which is provided with a connector, and the front end of which is connected to a drill bit. Slides are fixedly connected to both ends of the trolley, and the slides are slidably connected to the first connecting plate and the second connecting plate.

[0014] Preferably, the transverse sleeve has a concave ring at the front end and a convex ring at the rear end, and the convex ring of the previous transverse sleeve is inserted into the concave ring of the next transverse sleeve.

[0015] Preferably, the convex ring is composed of an upper connecting block and a lower connecting block, and the concave ring is composed of an upper connecting groove and a lower connecting groove; The upper half of the tube has an upper connecting groove fixedly connected to one end of the top and an upper connecting block corresponding to the upper connecting groove at the other end. The lower half of the tube has a lower connecting groove fixedly connected to one end of the bottom and a lower connecting block corresponding to the lower connecting groove at the other end.

[0016] Preferably, both the upper and lower pipes include a grid frame, an inner sheet metal, and an outer sheet metal. The grid frame is an arc-shaped plate with a semi-circular cross-section, formed by welding together several arc-shaped rectangular tubes and long rectangular tubes. The arc-shaped convex surface of the grid frame is covered with the outer sheet metal, and the arc-shaped concave surface of the grid frame is covered with the inner sheet metal. The outer sheet metal and the inner sheet metal are welded together or integrally formed to form a connecting part at the edge of the grid frame. The first connecting plate is welded to the connecting part of the upper pipe, and the second connecting plate is welded to the connecting part of the lower pipe.

[0017] The beneficial effects of this invention are as follows: This invention reduces the risk of collapse during excavation by pre-grouting to solidify the soil in front of the shaft and tunnel, ensuring the safety of construction personnel, underground pipelines, crossing roads, and ancillary facilities. It employs a cyclic grouting, excavation, and support process, forming a modular, prefabricated, assembly-line operation suitable for small tunnel excavation, solving a series of problems caused by the need to excavate the entire road surface when laying underground pipelines. The working shaft serves as a centralized channel for transporting excavated soil, avoiding the disruption of surface traffic caused by traditional open-cut methods. Finally, pipelines are installed within prefabricated transverse sleeves, ensuring accurate pipeline positioning and protection from ground compression, thus improving project quality. By installing vertical casings in sections during shaft excavation, the stability of the inner wall of the vertical passage is enhanced, preventing lateral deformation or local collapse of the deep shaft due to prolonged soil exposure, and providing a safe and reliable working environment for subsequent transverse passage construction. The vertical sleeve is assembled with bolts using four arc-shaped steel plates and filled with grout. The modular arc-shaped steel plates facilitate on-site size adjustment and efficient assembly. Grouting fills the gaps around the outer perimeter of the sleeve, achieving coordinated stress distribution and forming a simple water-stop barrier to inhibit groundwater seepage into the shaft, thus reducing the construction cost of concrete backfilling. The present invention provides a first connecting plate and a second connecting plate on the inner side of the sleeve and connects them with bolts. The connection is stable and does not obstruct the outside, making it easy to operate. A track is fixedly connected inside the lower half of the tube, and a sliding trolley is set on the track. A water drill is set on the trolley, which is conducive to drilling forward. The moving trolley facilitates the movement of the water drill and makes it easy to operate in a confined space. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is an axial cross-sectional view of the casing used in the advanced grouting and splicing construction of Embodiment 3 of the present invention; Figure 2 This is a schematic diagram of the radial structure of the pre-grouting splicing casing in Embodiment 3 of the present invention; Figure 3 This is a schematic diagram of the trolley used for the advanced grouting and pipe splicing construction casing in Embodiment 3 of the present invention; Figure 4 This is a schematic diagram of the structure of the pre-grouting splicing pipe construction sleeve after splicing in Embodiment 3 of the present invention.

[0019] Figure 5 This is an axial cross-sectional view of the casing used in the advanced grouting and splicing construction of Embodiment 4 of the present invention; Figure 6 This is a schematic diagram of the radial structure of the casing for the advanced grouting and splicing construction in Embodiment 4 of the present invention; Figure 7 For the present invention Figure 5 A magnified view of a section at point A.

[0020] The components are: 1. Horizontal sleeve; 2. Lower half-pipe; 3. Upper half-pipe; 4. Second connecting plate; 5. First connecting plate; 6. Track; 7. Trolley; 8. Bracket; 9. Axle; 10. Wheel; 11. Slide groove; 12. Water drill; 13. Connector; 14. Upper connecting block; 15. Lower connecting block; 16. Drill bit; 17. Upper connecting groove; 18. Lower connecting groove; 19. Slot; 20. Grid frame; 21. Outer sheet metal; 22. Inner sheet metal. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0022] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0023] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. It should be noted in the description of this invention that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Example 1 A pre-grouting pipe splicing construction method, when it is necessary to lay underground concealed pipes, adopts the following steps: Step S1: Excavate the working shaft: At the selected location, perform grouting operations vertically downwards to solidify the soil in the area where the shaft to be excavated is to be solidified. Within the solidified soil area, excavate downwards to form the working shaft. As a preferred example of the above embodiments, during the excavation of the working shaft, steel vertical sleeves are installed for support after each excavation distance. As a preferred example of the above embodiment, the vertical sleeve is composed of four arc-shaped steel plates connected by bolts, and the gaps around the outer periphery of the vertical sleeve are densely filled with grout. The four arc-shaped steel plates facilitate manual handling and installation.

[0026] Specifically, when dealing with general geological conditions, a suitable location is selected, and a cylindrical pit 1 meter deep is excavated. The diameter of the cylindrical pit is 3 meters. Then, a vertical steel structure sleeve is installed. The steel structure sleeve consists of four arc-shaped steel plates. Adjacent plates are connected by four M8 bolts in the circumferential direction. Strip mounting plates are welded to both sides of the arc-shaped steel plates. Adjacent arc-shaped steel plates are connected by two mounting plates. Each mounting plate has four through holes for M8 bolts. The gaps around the vertical sleeve are filled with grout. Then, support work is carried out every 0.5 meters of excavation until the bottom is reached.

[0027] Step S2, First-section transverse pre-grouting: At the predetermined excavation starting position at the bottom of the working shaft, construct a sealing wall; after the sealing wall is completed, use a water drill 12 to drill holes in the sealing wall in the predetermined direction; through the drilling, perform transverse grouting in the direction of passage advancement to solidify the soil in front of the first section of the planned excavation passage.

[0028] Specifically, select a suitable location, remove the steel plate corresponding to the vertical casing, and build a 0.5-meter-thick sealing wall using red bricks or sandbags to prevent grout from overflowing into the shaft through the sandbags; use a water drill 12 to drill a hole in the corresponding direction, with a drilling limit not exceeding 5 meters, and then inject grout into the hole.

[0029] As a preferred example of the above embodiments, after drilling a hole with a water drill 12, grout is directly injected through the drill rod.

[0030] Step S3: Excavate the first transverse passage: Excavate transversely within the first section of solidified soil area, and transport the excavated soil out through the working shaft to form the first transverse passage. Specifically, during construction, workers use manual picks or electric picks to excavate, and the soil inside the hole is transported out through a working shaft.

[0031] Step S4, Installation of transverse sleeve 1: Place transverse sleeve 1 in the first transverse channel. The transverse sleeve 1 includes an upper half pipe 3 and a lower half pipe 2, which are connected by a connecting plate. A track 6 is provided inside the transverse sleeve 1, and a trolley 7 is provided on the track 6. The trolley 7 can travel along the track 6. The water drill 12 and the drill bit 16 are detachably fixed on the trolley 7. Specifically, for every 0.5 meters of excavation, a steel structure transverse sleeve 1 is supported. During support, the lower half pipe 2 and the upper half pipe 3 are placed into the tunnel one after the other, with the upper half pipe 3 placed on the lower half pipe 2. The connecting plate includes a first connecting plate and a second connecting plate. The first connecting plate 5 is welded to the upper half pipe 3, and the second connecting plate 4 is welded to the lower half pipe 2. The first connecting plate 5 and the second connecting plate 4 are connected together using bolts.

[0032] Step S5, construction of the transverse passage, including: Step S5.1, Lateral advance grouting of the circulation section: Move the trolley 7 to the front end of the current channel working face, use the water drill 12 on the trolley 7 to drill holes in the direction of channel advance, and perform lateral grouting in the direction of channel advance through the drilled holes to solidify the soil in front of the next section of the channel to be excavated. Specifically, the lower half-pipe 2 is integrally formed with a track for the trolley 7 to travel inside the tunnel.

[0033] Step S5.2, Excavate the transverse passage of the circulation section: Perform transverse excavation within the solidified soil area of ​​the circulation section, and transport the excavated soil out through the working shaft to form the transverse passage of the circulation section. Step S5.3: Place a new transverse sleeve 1 in the transverse channel of the circulation section and connect two adjacent transverse sleeves 1; Specifically, during connection, first align the rails 6 on the two adjacent lower tube halves 2, then insert the upper tube halves 3 for assembly. During assembly, align the convex and concave rings, that is, simultaneously align the upper connecting block 14 with the upper connecting groove 17, and the lower connecting block 15 with the lower connecting groove 18, and secure them with bolts. The design of the upper tube halves 2 and lower tube halves 3 abandons the monolithic design, allowing for rapid installation in confined spaces without the need for large equipment or welding. Step S5.4: The trolley 7 moves along the track 6 into the new transverse sleeve 1 for subsequent operations; Specifically, when it is necessary to drill grouting holes again, the trolley 7 is placed inside the casing, the wheels 10 are placed on the track 6, and the water drill 12 is placed on the trolley 7. The connector 13 of the water drill 12 is connected to the power cord, the water drill 12 is turned on, and the drill bit 16 at the front end performs the drilling operation.

[0034] Step S5.5: Repeat steps S5.1 to S5.4 until the entire transverse channel is connected. Short-cycle operation is achieved through modular transverse sleeve 1.

[0035] Step S6, Pipeline Placement: After the horizontal channel construction is fully completed, place all necessary municipal pipelines, such as rainwater and sewage, electricity, communication, gas, and tap water pipelines, inside the horizontal sleeve 1.

[0036] Example 2 A pre-grouting pipe splicing construction method differs from Example 1 in that, after the water drill 12 completes drilling, a pre-drilled small guide tube is inserted into the hole. The pre-drilled small guide tube is made of steel pipe, and holes are drilled on the steel pipe in a spiral arrangement along the diameter of the steel pipe. The front end of the pre-drilled small guide tube is conical and sealed.

[0037] As a preferred example of the above embodiments, the eyelet spacing is 100mm and the aperture is 6mm.

[0038] As a preferred example of the above embodiments, the grouting uses a two-component grout, which is a mixture of water glass and cement grout. The water glass has a concentration of 35 to 40 Baume degrees, and the cement in the cement grout is ordinary Portland cement of grade 32.5 or higher. The volume ratio of water glass to cement grout is 1:1.

[0039] Example 3 like Figures 1-4 As shown, the pre-grouting pipe splicing construction sleeve used in the pre-grouting pipe splicing construction method includes an upper pipe 3 and a lower pipe 2, which are connected by a connecting plate. Specifically, the upper half tube 3 is fixedly connected to the inner sides of both ends with a first connecting plate 5, and the lower half tube 2 is fixedly connected to the inner sides of both ends with a second connecting plate 4 corresponding to the first connecting plate 5. Both the first connecting plate 5 and the second connecting plate 4 are provided with through holes, and a set of parallel tracks 6 are fixedly connected inside the lower half tube 2. It also includes a trolley 7, the bottom of which is connected to a bracket 8. The bottom of the bracket 8 is rotatably connected to an axle 9. Wheels 10 are fixedly connected to both ends of the axle 9. The wheels 10 move on the track 6. A water drill 12 is fixedly connected to the trolley 7. The rear end of the water drill 12 is provided with a connector 13. The front end of the water drill 12 is connected to a drill bit 16. Slide grooves 11 are fixedly connected to both ends of the trolley 7. The slide grooves 11 are slidably connected to the first connecting plate 5 and the second connecting plate 4. The two wheels 10 of the trolley 7 are respectively connected to the two side tracks 6. The two slide grooves 11 of the trolley 7 are respectively connected to the two side connecting plates, forming support in four directions to ensure the smooth operation of the trolley 7 in the transverse channel.

[0040] As a preferred example of the above embodiments, one end of the transverse sleeve 1 is provided with a concave ring and the other end is provided with a convex ring, and the convex ring of the previous transverse sleeve 1 is inserted into the concave ring of the next transverse sleeve 1.

[0041] Specifically, the convex ring is composed of an upper connecting block 14 and a lower connecting block 15, and the concave ring is composed of an upper connecting groove 17 and a lower connecting groove 18; The upper half of the tube 3 is fixedly connected to an upper connecting groove 17 at one end of its top and to an upper connecting block 14 corresponding to the upper connecting groove 17 at the other end. The lower half of the tube 2 is fixedly connected to a lower connecting groove 18 at one end of its bottom and to a lower connecting block 15 corresponding to the lower connecting groove 18 at the other end. When the transverse sleeve 1 is spliced, the upper connecting block 14 and the upper connecting groove 17 are inserted together, and the lower connecting block 15 and the lower connecting groove 18 are inserted together. After insertion, the tubes are fixed by bolts.

[0042] As a preferred example of the above embodiment, the slide groove 11 is provided with ball bearings, which are in direct contact with the connecting plate, thereby reducing the friction between the slide groove 11 and the connecting plate and making the trolley move more smoothly.

[0043] Example 4 like Figures 5-7 As shown, both the upper pipe 3 and the lower pipe 2 include a grid frame 20, an inner sheet metal 22, and an outer sheet metal 21. The grid frame 20 is an arc-shaped component with a semi-circular cross-section, formed by welding several arc-shaped rectangular tubes and long rectangular tubes. The arc-shaped convex surface of the grid frame 20 is covered with the outer sheet metal 21, and the arc-shaped concave surface of the grid frame 20 is covered with the inner sheet metal 22. The outer sheet metal 21 and the inner sheet metal 22 are welded together or integrally formed into a connecting part at the edge of the grid frame 20. The first connecting plate 5 is welded to the connecting part of the upper pipe 3, and the second connecting plate 4 is welded to the connecting part of the lower pipe 2. In use, this provides a lighter weight and a more robust structure.

[0044] As a preferred example of the above embodiment, the first connecting plate 5 is provided with an upper limit plate, the second connecting plate 4 is provided with a lower limit plate, and the slide groove 11 is a T-shaped groove. In use, the cross section of the first connecting plate 5 and the second connecting plate 4 after splicing is T-shaped, forming a T-shaped slide rail, which corresponds to the T-shaped groove. When the trolley 7 moves, the T-shaped groove 11 slides along the T-shaped slide rail, and the first connecting plate 5 and the second connecting plate 4 slide relative to the T-shaped groove, which can limit the trolley 7 and prevent the trolley 7 from derailing when it moves.

[0045] As a preferred example of the above embodiments, both the first connecting plate 5 and the second connecting plate 4 are machined parts.

[0046] As a preferred example of the above embodiments, the first connecting plate 5 and the second connecting plate 4 can be angle iron.

[0047] The upper pipe 3 and the lower pipe 2 are prefabricated in the factory and transported to the construction site for assembly, avoiding high-risk operations such as welding in confined spaces.

[0048] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A method for constructing pipe splicing with advanced grouting, characterized in that: Includes the following steps: Step S1: Excavate the working shaft: At the selected location, perform grouting operations vertically downwards to solidify the soil in the area where the shaft to be excavated is to be solidified. Within the solidified soil area, excavate downwards to form the working shaft. Step S2, First section of transverse advance grouting: At the predetermined excavation start position at the bottom of the working shaft, construct a sealing wall; after the sealing wall is completed, use a water drill (12) to drill holes in the sealing wall in the predetermined direction; through the drill holes, perform transverse grouting in the direction of passage advancement to solidify the soil in front of the first section of the planned excavation passage; Step S3: Excavate the first transverse passage: Excavate transversely within the first section of solidified soil area, and transport the excavated soil out through the working shaft to form the first transverse passage. Step S4, installation of transverse sleeve (1): Place transverse sleeve (1) in the first transverse channel; a track (6) is provided in the transverse sleeve (1), and a trolley (7) is provided on the track (6), which can travel along the track (6); the water drill (12) and the drill bit (16) are detachably fixed on the trolley (7); Step S5, construction of the transverse passage, including: Step S5.1, Circulation section transverse advance grouting: Move the trolley (7) to the front end of the current channel working face, use the water drill (12) on the trolley (7) to drill holes in the channel advancing direction, and grout in the transverse direction through the drilled holes to solidify the soil in front of the next section of the channel to be excavated; Step S5.2, Excavate the transverse passage of the circulation section: Perform transverse excavation within the solidified soil area of ​​the circulation section, and transport the excavated soil out through the working shaft to form the transverse passage of the circulation section. Step S5.3: Place a new transverse sleeve (1) in the transverse channel of the circulation section and connect two adjacent transverse sleeves (1). Step S5.4: The trolley (7) moves along the track (6) into the new transverse sleeve (1) for subsequent operations; Step S5.5: Repeat steps S5.1 to S5.4 until the entire transverse passage is connected; Step S6, Place the pipeline: After the horizontal channel construction is completed, place the required pipeline in the horizontal sleeve (1).

2. The pre-grouting pipe splicing construction method according to claim 1, characterized in that: In step S1, when excavating the working shaft, steel vertical sleeves are installed for support after each section of excavation.

3. The pre-grouting pipe splicing construction method according to claim 2, characterized in that: The vertical sleeve is composed of four arc-shaped steel plates connected by bolts, and the gaps around the outer perimeter of the vertical sleeve are filled with grout.

4. The pre-grouting pipe splicing construction method according to claim 1, characterized in that: In step S2, a hole is drilled using a water drill (12), and grout is injected directly through the drill rod.

5. The pre-grouting pipe splicing construction method according to claim 1, characterized in that: In step S2, a pre-conduit is set up. The pre-conduit is made of steel pipe, and eyelets are drilled on the steel pipe in a spiral arrangement along the diameter of the steel pipe. The front end of the pre-conduit is tapered and sealed.

6. The pre-grouting pipe splicing construction method according to claim 1, characterized in that: In step S4, the transverse sleeve (1) includes an upper half-pipe (3) and a lower half-pipe (2), which are connected by a connecting plate.

7. A pre-grouting pipe splicing construction sleeve for the pre-grouting pipe splicing construction method according to any one of claims 1-6, comprising a transverse sleeve (1), wherein the transverse sleeve (1) comprises an upper half pipe (3) and a lower half pipe (2), characterized in that: The upper half tube (3) is fixedly connected to the inner sides of both ends with a first connecting plate (5), and the lower half tube (2) is fixedly connected to the inner sides of both ends with a second connecting plate (4) corresponding to the first connecting plate (5). Both the first connecting plate (5) and the second connecting plate (4) have through holes. A set of parallel tracks (6) is fixedly connected inside the lower half tube (2). It also includes a trolley (7), the bottom of which is connected to a bracket (8), the bottom of which is rotatably connected to an axle (9), the two ends of which are fixedly connected to wheels (10), the wheels (10) moving on the track (6), a water drill (12) detachably connected to the trolley (7), the rear end of which is provided with a connector (13), the front end of which is connected to a drill bit (16), and the two ends of which are fixedly connected to a sliding groove (11), the sliding groove (11) slidingly connected to the first connecting plate (5) and the second connecting plate (4).

8. The pre-grouting splicing casing according to claim 7, characterized in that: The transverse sleeve (1) has a concave ring at the front end and a convex ring at the rear end. The convex ring of the previous transverse sleeve (1) is inserted into the concave ring of the next transverse sleeve (1).

9. The pre-grouting splicing casing according to claim 7, characterized in that: The convex ring is composed of an upper connecting block (14) and a lower connecting block (15), and the concave ring is composed of an upper connecting groove (17) and a lower connecting groove (18); The upper half of the tube (3) is fixedly connected to an upper connecting groove (17) at one end of the top and an upper connecting block (14) corresponding to the upper connecting groove (17) at the other end. The lower half of the tube (2) is fixedly connected to a lower connecting groove (18) at one end of the bottom and a lower connecting block (15) corresponding to the lower connecting groove (18) at the other end.

10. The pre-grouting splicing casing according to claim 7, characterized in that: The upper half (3) and the lower half (2) each include a grid frame (20), an inner sheet metal (22) and an outer sheet metal (21). The grid frame (20) is an arc plate with a semi-circular cross section, formed by welding several arc-shaped rectangular tubes and long rectangular tubes. The arc-shaped convex surface of the grid frame (20) is covered with the outer sheet metal (21), and the arc-shaped concave surface of the grid frame (20) is covered with the inner sheet metal (22). The outer sheet metal (21) and the inner sheet metal (22) are welded together at the edge of the grid frame (20) or integrally formed to form a connecting part. The first connecting plate (5) is welded to the connecting part of the upper half (3), and the second connecting plate (4) is welded to the connecting part of the lower half (2).

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