Pipe roofing structure for improving connection strength of lock catch pipe roofing joint and construction method

Abstract

The invention belongs to the technical field of pipe jacking construction, and particularly discloses a pipe roofing structure for improving the connection strength of lock catch pipe roofing connectors and a construction method, the pipe roofing structure comprises a plurality of pipe roofing steel pipes which are sequentially connected through lock catches, and female buckles and male buckles are welded to the two sides of the pipe roofing steel pipes respectively to form complete lock catches. A one-way grouting hole is formed in the pipe roof steel pipe body within the covering range of the lock catch and used for filling a gap in the lock catch. A closed wedge-shaped body is welded to the front end of the lock catch and used for preventing soil from entering the lock catch. The construction method comprises the steps that after the pipe roof vertical shaft is excavated, a pipe jacking machine is installed, the one-way grouting hole is machined, the female buckle, the male buckle and the closed wedge-shaped body are welded, pipe jacking construction is conducted, and pressurization grouting is conducted in the pipe roof steel pipe. The pipe roofing structure and the construction method can be used for improving the connection strength of the lock catch pipe roofing joint, and the problems that an existing lock catch pipe roofing joint is insufficient in connection strength and poor in pipe roofing integrity are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe jacking construction, and in particular to a pipe roof structure and a construction method for improving the connection strength of a locking pipe roof joint. Background Art

[0002] The pipe curtain method, a concealed excavation construction method for underground space development, has been widely used in urban underground engineering construction in recent years. This method utilizes small-diameter pipe jacking equipment to pre-install steel pipes around the perimeter of the structure and connect the sides of the pipes with locks, forming an advanced support system capable of withstanding upper loads. Simultaneously, the gaps between the locks are filled with water-stopping material to create a curtain structure that isolates the surrounding water and soil, effectively minimizing disturbance to the surrounding environment. The pipe curtain method is a trenchless technology with advantages such as fast construction speed, minimal impact on ground traffic, and environmental friendliness.

[0003] Compared to traditional pipe-roof construction methods, the pipe-roof method's most notable feature is that the steel pipes are connected via locking clips, and the gaps between the clips can be grouting or filled with water-stopping material, ensuring a tight connection between the pipes. This design gives the pipe-roof method significant advantages in terms of integrity and applicability, allowing it to better adapt to complex geological conditions and engineering requirements.

[0004] However, in actual engineering applications, the pipe-roof method has also exposed some pressing issues. Due to the extremely limited space between the locks, the soil inside the locks cannot be cleaned or reinforced with grouting during the pipe-roof jacking process. Untouched soil often remains inside the locks, significantly reducing the strength and integrity of the connection between the pipe-roof steel tubes. This limitation not only affects the construction effectiveness of the pipe-roof method but also significantly limits its application in a wider range of engineering scenarios.

[0005] Therefore, how to effectively solve the problem of cleaning the soil inside the lock and grouting reinforcement, and improve the overall performance and applicability of the pipe curtain method, has become a technical problem that needs to be overcome urgently in the current underground engineering construction field. Summary of the Invention

[0006] The purpose of the present invention is to provide a pipe curtain structure and a construction method for improving the connection strength of the locking pipe curtain joint, so as to solve the above-mentioned technical problems existing in the prior art.

[0007] To achieve the above-mentioned purpose, in one aspect, the present invention proposes a pipe curtain structure for improving the connection strength of the locking pipe curtain joint, comprising a plurality of pipe curtain steel pipes connected in sequence by locking buckles, wherein a mother buckle and a child buckle are welded on both sides of the pipe curtain steel pipe, and the mother buckle and the child buckle of the two adjacent pipe curtain steel pipes cooperate with each other to form a complete locking buckle; a plurality of one-way grouting holes are opened on the pipe body of the pipe curtain steel pipe within the coverage range of the mother buckle and the child buckle, and when the mother buckle and the child buckle are connected, each one-way grouting hole is located inside the locking buckle, and is used to fill the internal gap of the locking buckle when pressurized grouting is performed inside the pipe curtain steel pipe; a closed wedge is welded at the front end of the locking buckle of each pipe curtain steel pipe, and the closed wedge is used to discharge the soil in front of the locking buckle into the interior of the pipe curtain steel pipe during the pipe jacking process, so as to prevent the soil from entering the internal space of the locking buckle.

[0008] The above technical solution aims to propose a pipe curtain structure for improving the connection strength of the lock-buckle pipe curtain joint. By improving the lock design, the soil discharge mechanism of the closed wedge body and optimizing the grouting process, the problem of cleaning the soil inside the lock and grouting reinforcement is solved, thereby significantly improving the connection strength and integrity of the lock-buckle pipe curtain joint, enhancing the stability and applicability of the pipe curtain structure, and at the same time improving construction efficiency and safety, providing a more reliable solution for underground engineering construction under complex geological conditions.

[0009] Furthermore, the female buckle is composed of two angle steels with inner corners welded to the pipe roof steel pipe, facing each other. The male buckle is composed of two angle steels with inner corners welded to the pipe roof steel pipe, facing away from each other. The female buckle and male buckle, through a specific welding method for the angle steels, form a mechanical interlocking structure, enhancing the connection stability between the pipe roof steel pipes and effectively improving the shear and bending strength of the locking joint. Furthermore, this structural design ensures a tighter fit between the female buckle and male buckle, and the male buckle can be smoothly inserted into the female buckle, facilitating quick connection and installation during construction, thereby improving construction efficiency.

[0010] Furthermore, grouting pipes are installed at the welded corners between the female buckle and the pipe-roof steel tube. These pipes are used to grout and reinforce the soil surrounding the female buckle during the jacking process. This simultaneous grouting and reinforcement of the soil surrounding the female buckle during jacking effectively improves soil stability, reduces disturbance to the surrounding soil during jacking, and reduces the rate of ground loss. This grouting strengthens the bond between the soil and the pipe-roof steel tube, enhancing the integrity and stability of the entire pipe-roof structure.

[0011] Furthermore, the closed wedge comprises a first wedge welded to one end of the female buckle and a second wedge welded to one end of the male buckle. The second wedge's dimensions are compatible with the male buckle, ensuring smooth insertion into the female buckle. This closed wedge design effectively prevents undisturbed soil from entering the buckle, preventing damage to the buckle structure and protecting the buckle's integrity during construction.

[0012] Furthermore, the inclined surface of the closed wedge faces the pipe-roof steel tube, drawing soil in front of the lock into the interior of the pipe-roof steel tube during jacking. This creates better conditions for subsequent grouting operations, ensuring that the grouting material fully fills the gaps within the lock, further improving the connection strength of the lock joint.

[0013] Furthermore, the unidirectional grouting holes are evenly distributed along the length of the pipe curtain steel pipe on the side of the welded male buckle, and are arranged in a plum blossom pattern on the side of the welded female buckle. The evenly distributed unidirectional grouting holes ensure uniform penetration of the grouting material within the buckle, avoiding grouting dead spots and improving grouting uniformity and effectiveness. The plum blossom-shaped grouting holes on the female buckle side better fill the gaps within the buckle, forming a dense reinforcement layer and significantly improving the shear and bending strength of the joint.

[0014] Furthermore, the connection positions of the female and male fasteners to the tube body are adaptively adjusted based on the pipe curtain layout. In a linear arrangement, the line connecting the female and male fasteners passes through the center of the pipe curtain steel tube; in an arc-shaped arrangement, the female and male fasteners lie on the same spatial circle and coincide with the tunnel center. By adjusting the welding positions of the female and male fasteners, the pipe curtain structure can be arranged flexibly, overcoming the limitation of traditional fasteners that only apply to flat arrangements and improving the applicability of the pipe curtain structure.

[0015] In another aspect, the present invention further provides a construction method for improving the connection strength of a locking pipe curtain joint, using the pipe curtain structure for improving the connection strength of a locking pipe curtain joint as described in any of the above embodiments, the method comprising the following steps:

[0016] S1: After the excavation of the pipe curtain shaft is completed, the pipe jacking machine is installed;

[0017] S2: Process one-way grouting holes on both sides of the horizontal pipe wall of the pipe curtain steel pipe, weld a female buckle on the first jacked pipe curtain steel pipe and weld a closed wedge at its front end;

[0018] S3: Use a pipe jacking machine to push the first pipe curtain steel pipe into the ground;

[0019] S4: Weld the sub-screws and the female buckle to the subsequent pipe curtain steel pipe respectively, and weld the corresponding closed wedge-shaped bodies at the front ends of the sub-screws and the female buckle;

[0020] S5: Repeat steps S3-S5 until all the pipe curtain steel pipes are pushed into the ground;

[0021] S6: Pressurize the interior of the pipe curtain steel pipe and fill the internal gap of the lock buckle through the one-way grouting hole.

[0022] In some alternative methods, simultaneous grouting of the soil around the interlocking elements is performed through grouting pipes during the jacking process. This simultaneous grouting can promptly fill voids created during jacking, minimizing ground loss and the impact on the surrounding environment. Furthermore, by reinforcing the soil around the interlocking elements, construction safety is enhanced and risks are reduced.

[0023] In some optional methods, during the jacking process, the soil in front of the lock is discharged into the pipe curtain steel pipe through the closed wedge, ensuring that no original soil remains inside the lock. The closed wedge can effectively discharge the soil in front of the lock, ensuring that no original soil remains inside the lock, providing better conditions for subsequent grouting operations.

[0024] In some optional methods, the pressure range of the pressurized grouting is 0.5 to 1.0 MPa, and the grouting material is cement mortar or chemical slurry. Pressurized grouting of the interior of the lock buckle through a one-way grouting hole can quickly fill the gaps inside the lock buckle, improve grouting efficiency, and shorten the construction period. A reasonable pressurized grouting pressure range can ensure that the grouting material fully fills the gaps inside the lock buckle, forming a dense reinforcement layer and improving the grouting quality. Cement mortar and chemical slurry can be selected according to different geological conditions to improve the adaptability and applicability of the grouting material.

[0025] Based on the above construction method, the soil inside the lock buckle can be discharged during the pipe-roof steel pipe jacking stage, and the internal voids of the lock buckle can be filled with grouting while grouting inside the pipe-roof steel pipe, so as to solve the technical problems of insufficient connection strength and integrity between the pipe-roof steel pipes.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] This invention effectively solves the challenges of soil removal and grouting reinforcement within the lock buckle by optimizing its design, closed wedge-shaped soil removal mechanism, and grouting process. Its beneficial effects include improving the shear and bending strength of the lock buckle joint, preventing soil from entering the lock buckle, enhancing the integrity and stability of the pipe-roof structure, improving construction efficiency and safety, and reducing leakage. It also adapts to a variety of tunnel cross-sectional shapes, broadening the application scope of the pipe-roof method and providing an efficient and reliable solution for underground engineering construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1This is a front view of the pipe curtain steel pipe in an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Cross-sectional view at AA in the middle;

[0031] Figure 3 This is a right side view of the pipe curtain steel pipe in an embodiment of the present invention;

[0032] Figure 4 The axonometric view of the pipe roof steel pipe in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0033] Figure 5 Axonometric view of the pipe roof steel pipe in the embodiment of the present invention Figure 2 ;

[0034] Figure 6 Schematic diagram of the structure of the locking buckle pushing end head closing wedge-shaped body in an embodiment of the present invention;

[0035] Figure 7 Schematic diagram of the connection between two adjacent pipe curtain steel pipes in an embodiment of the present invention;

[0036] Figure 8 Schematic diagram of adjacent pipe-roof steel pipes after grouting of the pipe-roof in an embodiment of the present invention;

[0037] Figure 9 Schematic diagram of the pipe curtain bearing structure in an embodiment of the present invention.

[0038] In the figure: 1. Pipe curtain steel pipe body; 2. Female buckle; 3. Male buckle; 4. Grouting pipe; 5. Closed wedge; 6. One-way grouting hole; 7. Mortar; 8. Tunnel. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the following Figure 6 The present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] Reference Figures 1 to 9As shown, embodiment 1 of the present invention provides a pipe curtain structure for improving the connection strength of the locking pipe curtain joint, comprising a plurality of pipe curtain steel pipes connected in sequence by locking buckles, with a female buckle 2 and a male buckle 3 welded on both sides of the pipe curtain steel pipe, respectively. The female buckle 2 and the male buckle 3 protrude from the pipe body of the pipe curtain steel pipe in opposite radial directions of the pipe curtain steel pipe, and the female buckle 2 and the male buckle 3 cooperate with each other to form a complete locking buckle for connecting two adjacent pipe curtain steel pipes. Figure 2 As shown, both the female buckle 2 and the sub-buckle 3 extend along the axial direction of the pipe curtain steel pipe. Grouting pipes 4 are provided at the welding corners between the female buckle 2 and the pipe curtain steel pipe. There are two grouting pipes 4, located at the upper corner and the lower corner of the female buckle 2 respectively. The grouting pipes 4 are parallel to the pipe curtain steel pipe and are fixed to the pipe curtain steel pipe by welding. The grouting pipes 4 are used to grout and reinforce the soil around the lock buckle during the jacking process. In addition, a number of one-way grouting holes 6 are opened on the pipe curtain steel pipe body at the location of the female buckle 2 and the sub-buckle 3. When the female buckle 2 and the sub-buckle 3 are connected, each one-way grouting hole 6 is inside the lock buckle. During the pressurized grouting process inside the pipe curtain steel pipe, the internal gap of the lock buckle is filled to enhance the connection strength of the lock buckle joint.

[0043] Before jacking, the one-way grouting holes 6 are machined on the horizontal walls of the pipe curtain steel pipes on both sides. After all the pipe curtain steel pipes are jacked, the inside of the pipe curtain steel pipes is pressurized and grouting is performed. The mortar 7 flows into the lock buckle through the one-way grouting holes 6 under pressure. Figure 7 and Figure 8 After all the pipe-roof steel pipes are pushed in, the pipe-roof structure is formed. Then, under the protection of the pipe-roof steel pipes, the soil in the tunnel 8 below is excavated to construct the tunnel 8 structure. Figure 9 shown.

[0044] In the above embodiment, to prevent soil from entering the internal space of the lock buckle during the pipe jacking process and causing damage to the lock buckle during the jacking phase, a closed wedge 5 is welded to the front end of the lock buckle of each pipe roof steel pipe. Specifically, it includes a first wedge welded to one end of the mother buckle 2 and a second wedge welded to one end of the child buckle 3. The outer dimensions of the second wedge are adapted to those of the child buckle 3 so as not to affect the entry of the child buckle 3 into the interior of the mother buckle 2. During the pipe jacking process, the closed wedge 5 can discharge soil in front of the lock buckle into the interior of the pipe roof steel pipe.

[0045] In a specific embodiment, the female buckle 2 and the sub-buckle 3 are both angle steels welded to the pipe roof steel pipe, and the female buckle 2 and the sub-buckle 3 are formed by changing the welding position and welding angle of the angle steel. Figure 2As shown, the inner angles of the two angle steels are welded to each other on the pipe roof steel pipe to form a female buckle 2 with an open inner frame shape; the inner angles of the two angle steels are welded to the pipe roof steel pipe with their backs to each other to form a sub-buckle 3 extending to both sides; wherein, the welding distance between the two angle steels of the sub-buckle 3 is smaller than the opening width of the female buckle 2, so that the sub-buckle 3 can be smoothly inserted into the interior of the female buckle 2.

[0046] In a specific embodiment, the connection positions of the female buckle 2, the sub-buckle 3 and the pipe body are radially symmetrical, that is, the connecting line of the female buckle 2 and the sub-buckle 3 passes through the center of the pipe curtain steel pipe. At this time, multiple pipe curtain steel pipes are located on the same plane after connection, which is suitable for supporting the linear arrangement of the pipe curtain.

[0047] In another specific embodiment, the female buckle 2 and the sub-buckle 3 are adaptively adjusted in position according to the shape of the tunnel 8 to be supported. For example, when the tunnel 8 is arc-shaped, the female buckle 2 and the sub-buckle 3 on each pipe curtain steel pipe are located on the same space circle, and the space circle coincides with the center of the tunnel 8. Figure 9 shown.

[0048] In a specific embodiment, the one-way grouting holes 6 on one side of the pipe curtain steel pipe welding buckle 3 are evenly distributed along the length direction of the pipe curtain steel pipe; the one-way grouting holes 6 on one side of the pipe curtain steel pipe welding female buckle 2 are distributed in a plum blossom shape along the length direction of the pipe curtain steel pipe. Specifically, multiple rows of one-way grouting holes 6 are distributed on the pipe body of the pipe curtain steel pipe on one side of the female buckle 2, and multiple adjacent one-way grouting holes 6 in each row are distributed in a plum blossom shape, and several plum blossom-shaped grouting hole groups are evenly distributed along the length direction of the pipe curtain steel pipe.

[0049] In a specific embodiment, the closed wedge-shaped body 5 at the front end of the lock buckle is processed according to the size of the sub-buckle 3 and the female buckle 2 and welded to the front end of the lock buckle, with the inclined surface facing the pipe curtain steel pipe, and it is necessary to ensure that the closed wedge-shaped body 5 at the front end of the sub-buckle 3 does not damage the female buckle 2 that has been pushed in during the jacking process of the pipe curtain steel pipe. Figure 7 shown.

[0050] The pipe-roof structure for improving the connection strength of a locking pipe-roof joint, provided in Example 1 of the present invention, achieves high-strength connection and improved integrity of the pipe-roof joint through the synergistic effects of an innovative locking design, a soil-discharging mechanism of a closed wedge 5, and a grouting process. Its working principle includes the following steps:

[0051] A female buckle 2 and a male buckle 3 are welded to either side of the steel tubes. The female buckle 2 has an inward-framed opening, while the male buckle 3 has an outward-flapping structure. The male buckle 3 inserts into the female buckle 2 to form a mechanical interlock. A full-length grouting pipe 4 is installed at the corner where the female buckle 2 is welded to the steel tube for pre-grouting and reinforcement of the soil around the buckle during jacking. The axial extension of the buckle ensures that adjacent steel tubes form a continuous support system when connected.

[0052] A closed wedge 5 is welded at the front end of the lock buckle. The structure of the closed wedge 5 is as follows: Figure 6 As shown, the inclined surface of the closed wedge 5 faces the pipe roof steel pipe. During jacking, the closed wedge 5 forces the soil in front of the lock buckle into the pipe roof steel pipe, preventing soil from intruding into the internal space of the lock buckle. The closed wedge 5 at the front of the sub-buckle 3 is sized to fit the female buckle 2, ensuring that the connected lock buckle structure is not damaged during jacking, thereby protecting the integrity of the lock buckle during the construction phase.

[0053] Before jacking, one-way grouting holes 6 are processed on the horizontal walls of the steel pipe on both sides. After jacking is completed, pressurized grouting is performed through the inside of the steel pipe. Under the action of pressure, mortar 7 flows into the inside of the lock buckle through the one-way grouting holes 6, completely filling the gaps remaining in the original soil, forming a dense reinforcement layer, and significantly improving the shear and bending strength of the joint.

[0054] The pipe curtain system is gradually constructed by nesting the sub-and-sub-locks 2, following the sequence of "starting pipe (only female buckle 2) → intermediate pipe (sub-lock 3 + female buckle 2) → terminal pipe (only sub-lock 3)". Grouting is carried out in two stages: during jacking, the soil around the lock buckles is reinforced through grouting pipes 4; after all jacking is completed, the interior of the lock buckles is filled through unidirectional grouting holes 6, ultimately forming a continuous support structure with both high strength and waterproof properties.

[0055] Based on the above structure and working principle, the present invention overcomes the technical bottleneck of insufficient soil cleaning and grouting inside the locking pipe curtain through the dual technical innovation of "mechanical soil discharge + pressure grouting", providing a safer and more efficient solution for underground projects under complex geological conditions.

[0056] Example 2

[0057] Embodiment 2 of the present invention further provides a construction method for improving the connection strength of a locking pipe curtain joint. The construction method adopts the pipe curtain structure for improving the connection strength of a locking pipe curtain joint described in the above embodiment, and includes the following steps:

[0058] S1: After the pipe curtain shaft is excavated, the pipe jacking machine is installed;

[0059] S2: Processing one-way grouting holes 6 on both sides of the horizontal pipe wall of the pipe curtain steel pipe, welding box buckles 2 on both sides of the horizontal pipe wall of the first jacked pipe curtain steel pipe, and welding a first wedge-shaped body to the front end of the box buckle 2;

[0060] S3: Use a pipe jacking machine to push the first pipe curtain steel pipe into the ground;

[0061] S4: Weld the sub-buckle 3 and the female buckle 2 on the horizontal side walls of the second pipe-roof steel pipe to be pushed in, and weld a first wedge-shaped body to the front end of the female buckle 2 and a second wedge-shaped body to the front end of the sub-buckle 3;

[0062] S5: Use a pipe jacking machine to push the second pipe curtain steel pipe into the formation, and at the same time complete the connection between the sub-buckle 3 on the second pipe curtain steel pipe and the female buckle 2 on the first pipe curtain steel pipe;

[0063] S6: Repeat steps S3-S5 until all the pipe curtain steel pipes are pushed into the ground;

[0064] S7: Pressurized grouting is performed inside the pipe curtain steel pipe, and the internal gap of the lock buckle is filled through the one-way grouting holes 6 on the horizontal walls of the pipe curtain steel pipe on both sides.

[0065] In some embodiments, during the jacking process, the soil around the lock is synchronously grouting and reinforced through the grouting pipe 4.

[0066] In some embodiments, during the jacking process, the soil in front of the lock buckle is discharged into the interior of the pipe curtain steel pipe through the closed wedge 5, ensuring that no original soil remains inside the lock buckle.

[0067] In some embodiments, the pressure range of the pressurized grouting is 0.5-1.0 MPa, and the grouting material is cement mortar 7 or chemical slurry.

[0068] The above construction method completely solved the problem of residual undisturbed soil inside the lock buckle. Combined with pressurized grouting and filling, the shear strength of the joint was significantly improved. The grouting hole design ensured that the slurry evenly penetrated the interior of the lock buckle, and the grouting efficiency was increased by more than 30%. The grouting pipe 4 simultaneously reinforced the soil around the lock buckle, reducing the formation loss rate to less than 5%. The construction speed was increased by more than 20% compared with the traditional method. After grouting inside the lock buckle, a continuous water-stop curtain was formed, and the leakage rate was reduced by 90% (measured ≤0.1L / m 2 d) This is superior to the existing secondary grouting solution; by adjusting the welding positions of the mother buckle 2 and the sub-buckle 3, flexible layout of the pipe roof can be achieved, overcoming the limitation of traditional lock buckles that are only applicable to flat layout.

[0069] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0070] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A pipe roof structure for improving the connection strength of a locking pipe roof joint, comprising a plurality of pipe roof steel pipes sequentially connected by locking buckles, characterized in that: A mother buckle (2) and a child buckle (3) are welded on both sides of the pipe curtain steel pipe, and the mother buckles (2) and child buckles (3) of two adjacent pipe curtain steel pipes cooperate with each other to form a complete lock buckle; a plurality of one-way grouting holes (6) are opened on the pipe curtain steel pipe body within the coverage range of the mother buckle (2) and the child buckle (3); when the mother buckle (2) and the child buckle (3) are connected, each one-way grouting hole (6) is located inside the lock buckle, and is used to fill the internal gap of the lock buckle when pressurized grouting is performed inside the pipe curtain steel pipe; a closed wedge (5) is welded at the front end of the lock buckle of each pipe curtain steel pipe, and the closed wedge (5) is used to discharge the soil in front of the lock buckle into the interior of the pipe curtain steel pipe during the pipe jacking process, so as to prevent the soil from entering the internal space of the lock buckle.

2. The pipe roof structure for improving the connection strength of the locking pipe roof joint according to claim 1, characterized in that: The female buckle (2) is composed of two angle steels whose inner corners are welded to the pipe roof steel pipe facing each other, and the sub-buckle (3) is composed of two angle steels whose inner corners are welded to the pipe roof steel pipe facing away from each other.

3. The pipe roof structure for improving the connection strength of the locking pipe roof joint according to claim 2, characterized in that: A grouting pipe (4) is provided at the welding corner between the female buckle (2) and the pipe curtain steel pipe, and the grouting pipe (4) is used for grouting and reinforcing the soil around the lock buckle during the jacking process.

4. The pipe roof structure for improving the connection strength of the locking pipe roof joint according to claim 1, characterized in that: The closed wedge-shaped body (5) comprises a first wedge-shaped body welded to one end of the female buckle (2) and a second wedge-shaped body welded to one end of the male buckle (3). The outer dimensions of the second wedge-shaped body are adapted to those of the male buckle (3), ensuring that the second wedge-shaped body can be smoothly inserted into the interior of the female buckle (2).

5. The pipe roof structure for improving the connection strength of the locking pipe roof joint according to claim 4, characterized in that: The inclined surface of the closed wedge-shaped body (5) faces the pipe-roof steel pipe, and the soil in front of the lock buckle is introduced into the interior of the pipe-roof steel pipe during jacking.

6. The pipe roof structure for improving the connection strength of the locking pipe roof joint according to claim 1, characterized in that: The one-way grouting holes (6) are evenly distributed along the length direction on the pipe curtain steel pipe on the side of the welding sub-buckle (3), and are distributed in a plum blossom shape on the pipe curtain steel pipe on the side of the welding female buckle (2).

7. A construction method for improving the connection strength of a locking pipe-roof joint, using the pipe-roof structure for improving the connection strength of a locking pipe-roof joint according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: After the excavation of the pipe curtain shaft is completed, the pipe jacking machine is installed; S2: Processing one-way grouting holes (6) on both horizontal sides of the pipe curtain steel pipe, welding a female buckle (2) on the first pipe curtain steel pipe to be pushed in, and welding a closed wedge (5) on its front end; S3: Use a pipe jacking machine to push the first pipe curtain steel pipe into the ground; S4: Welding the sub-buckle (3) and the female buckle (2) on the subsequent pipe curtain steel pipe respectively, and welding corresponding closed wedge-shaped bodies (5) at the front ends of the sub-buckle (3) and the female buckle (2); S5: Repeat steps S3-S5 until all the pipe curtain steel pipes are pushed into the ground; S6: Pressurize and grout the interior of the pipe curtain steel pipe to fill the internal space of the lock buckle through the one-way grouting hole (6).

8. The construction method for improving the connection strength of the lock-type pipe curtain joint according to claim 7, characterized in that: During the jacking process, the soil around the lock buckle is synchronously grout-reinforced through the grouting pipe (4).

9. The construction method for improving the connection strength of the lock-type pipe curtain joint according to claim 7, characterized in that: During the jacking process, the soil in front of the lock buckle is discharged into the interior of the pipe curtain steel pipe through the closed wedge body (5), ensuring that no original soil remains inside the lock buckle.

10. The construction method for improving the connection strength of the lock-buckle pipe curtain joint according to claim 7, characterized in that: The pressure range of the pressurized grouting is 0.5-1.0 MPa, and the grouting material is cement mortar (7) or chemical slurry.

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