Reinforced pipe shed pipe for tunnel engineering and construction method

Abstract

The invention provides a tunnel engineering reinforced pipe shed pipe and a construction method, and belongs to the technical field of tunnel construction, a pipe tip is arranged at one end of the head of a pipe tip section, a first longitudinal rib plate is arranged on the outer wall of the pipe tip section, a standard section is assembled and connected to the tail of the pipe tip section through a connecting pipe, and a second longitudinal rib plate is arranged on the outer wall of the standard section; the adjacent standard sections are assembled and connected through connecting pipes; the tail part of the standard section at the tail end is assembled and connected with a pipe top section through a connecting pipe, a third longitudinal rib plate is arranged on the outer wall of the pipe top section, and the tail part of the pipe top section is assembled and connected with a propelling grouting section through a connecting pipe. Through the steel pipe and longitudinal rib plate combined structure, the flexural rigidity and structural stability of a pipe shed supporting system are effectively improved, and therefore the problem that the strength and rigidity of an original independent steel pipe cement grout or steel pipe and reinforcement cage concrete combination are insufficient is thoroughly solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of advanced support of underground engineering, and particularly relates to a reinforced pipe shed pipe for tunnel engineering and a construction method. BACKGROUND

[0002] In order to prevent surface subsidence and surrounding rock loosening caused by tunnel or underground tunnel excavation, thick-walled steel pipes are designed to be punched into the upper half section and side wall of the excavation working face before excavation, and a temporary bearing shed is constructed in the stratum to perform pre-support before excavation, so as to prevent soil collapse and surface subsidence during excavation and ensure the safe operation of excavation and subsequent support technology. The stiffness of the pipe shed pipe plays a decisive role in the quality of the advanced support. In order to increase the stiffness of the steel pipe, the commonly used technical measures at present are: Grouting reinforcement type pipe shed: the existing flower pipe grouting technology can only locally consolidate the soft stratum around the pipe, and has little effect on the stiffness of the overall support structure. Affected by the borehole diameter, only the number of boreholes can be increased to increase the stiffness of the overall structure. This method has low construction efficiency, has a great impact on the construction site environment, has high labor intensity, and has high construction cost. Built-in reinforced pipe shed: the existing steel pipe is internally built-in with steel bars or steel cages, and then concrete is pressed into the steel pipe and cement slurry is injected. The steel bars or steel cages are circular in cross-section and cannot form strong stiffness, which is far inferior to the stiffness of T-shaped steel. Only by increasing the diameter and number of steel bars or increasing the number of pipe sheds can the problem of insufficient stiffness be compensated. This method also has the disadvantages of low construction efficiency, great environmental impact, increased labor intensity, and increased construction cost. SUMMARY The application aims to provide a reinforced pipe shed pipe for tunnel engineering and a construction method. The pipe shed pipe is combined with a steel pipe and a longitudinal rib plate for extremely broken rock mass, quicksand layer, shallow buried bias, and other adverse geological conditions, effectively improves the bending stiffness and structural stability of the pipe shed support system, and completely solves the problems of insufficient strength and stiffness of the original single steel pipe grouting cement slurry or steel pipe + steel cage concrete combination. The longitudinal rib plate and the steel pipe are combined to form a rib arch effect, significantly improve the bending shear performance, and especially in small pipe shed construction, the support capacity is significantly improved.

[0003] In order to realize the above technical features, the purpose of the present application is realized as follows: a tunnel engineering reinforced pipe roof pipe comprises a pipe tip section, a pipe tip is arranged at the head end of the pipe tip section, a first longitudinal rib plate is arranged on the outer wall of the pipe tip section, a standard section is assembled and connected to the tail end of the pipe tip section through a connecting pipe, a second longitudinal rib plate is arranged on the outer wall of the standard section, and adjacent standard sections are connected through connecting pipes; the tail end of the last standard section is connected to a pipe top section through a connecting pipe, a third longitudinal rib plate is arranged on the outer wall of the pipe top section, and a pushing grouting section is connected to the tail end of the pipe top section through a connecting pipe.

[0004] Preferably, the pipe tip section comprises a first steel pipe body, a closed conical pipe tip is arranged at the head end of the first steel pipe body, the first longitudinal rib plate is uniformly fixed on the outer wall of the first steel pipe body along the axial direction, a first inner thread for mounting the connecting pipe is arranged at the tail end of the first steel pipe body, and a plurality of first grouting holes are arranged on the first steel pipe body.

[0005] Preferably, the standard section comprises a second steel pipe body, a second inner thread for mounting the connecting pipe is arranged on the inner wall of the head end of the second steel pipe body, the second longitudinal rib plate is uniformly fixed on the outer wall of the second steel pipe body along the axial direction, a third inner thread for mounting the connecting pipe is arranged at the tail end of the second steel pipe body, and a plurality of second grouting holes are arranged on the second steel pipe body.

[0006] Preferably, the pipe top section comprises a third steel pipe body, a fourth inner thread for mounting the connecting pipe is arranged on the inner wall of the head end of the third steel pipe body, the third longitudinal rib plate is uniformly fixed on the outer wall of the third steel pipe body along the axial direction, a fifth inner thread for mounting the connecting pipe is arranged at the tail end of the third steel pipe body, and a plurality of third grouting holes are arranged on the third steel pipe body.

[0007] Preferably, the outer wall of the connecting pipe is arranged with a complete outer thread.

[0008] Preferably, the pushing grouting section comprises an inner threaded connecting pipe, a sixth inner thread is arranged on the inner wall of the inner threaded connecting pipe, a pushing grouting plate is fixed at the end of the inner threaded connecting pipe, a reserved grouting hole is arranged on the pushing grouting plate, and a sealing conical pipe is not fixed on the outer end surface of the pushing grouting plate and the outside of the inner threaded connecting pipe.

[0009] Preferably, the number of the first longitudinal rib plate, the second longitudinal rib plate and the third longitudinal rib plate is 4-12.

[0010] Preferably, the pipe tip section, the standard section and the pipe top section all respectively adopt seamless steel pipes, and the material is Q235 or higher strength steel. The first longitudinal rib plate, the second longitudinal rib plate and the third longitudinal rib plate adopt flat plates, T-shaped steel or L-shaped steel.

[0011] Preferably, the thickness of the first, second and third longitudinal rib plates is 5-10 mm, and the height is 1 / 5-1 / 3 of the pipe diameter.

[0012] Another aspect of the present application provides a construction method of a tunnel engineering reinforced pipe roof pipe, comprising the following steps: Step 1: Factory production of the reinforced pipe roof pipe: A standard modular pipe tip section, a standard section, a pipe top section, a connecting pipe and a pushing grouting section are made in advance in a factory building; Step 2: Transportation of the reinforced pipe roof pipe: The prefabricated pipe tip section, standard section, pipe top section, connecting pipe and pushing grouting section are transported to the construction site; Step 3: Pushing of the pipe tip section: A hole is drilled in advance, and the pipe tip section is pushed along the hole according to the position of the required support, and the pipe tip section is pushed through the soil; Step 4: Assembly and pushing of the standard section: After the installation of the pipe tip section is completed, the standard sections are assembled and connected through the connecting pipe, and a proper number of standard sections are assembled according to the requirements of the specific support; Step 5: Assembly and pushing of the pipe top section and the pushing grouting section: After all the standard sections are installed, the pipe top section and the pushing grouting section are assembled and connected through the connecting pipe; Step 6: Grouting of the reinforced pipe roof pipe: The grouting equipment is connected to the tail of the pushing grouting section, and the grouting equipment is started to grout the inside of the reinforced pipe roof pipe, and the grout enters between the reinforced pipe roof pipe and the hole wall of the drill hole.

[0013] The present application has the following beneficial effects: 1. Overall improvement of structural performance: Stiffness and strength are doubled: through the combined design of the steel pipe and the longitudinal rib plate, a "I-beam" bending section is formed, which significantly improves the bending and shearing performance of the overall structure and reduces the number of pipe roofs.

[0014] 2. Significant improvement of construction efficiency and convenience: Standardized and rapid installation: the segmented threaded connection is adopted to replace the traditional welding process, the time required for the lengthening of single-section pipe sections is shortened, the work efficiency is improved, and large welding equipment is not required, thereby reducing the complexity of on-site operation.

[0015] Low-resistance pushing design: the rib plate only contacts the hole wall at the equidistant line, instead of the traditional full circumferential friction of the steel pipe, the pushing resistance is reduced, and it is especially suitable for long-distance pipe roof construction of >20 m.

[0016] Compatible with existing equipment: The pipe body size is compatible with standard drill bits, eliminating the need to modify drilling rigs or purchase special equipment, thus lowering the construction threshold.

[0017] 3. Significantly optimized cost-effectiveness: Material savings: The stiffened plate structure can reduce the number of pipe roofs and the amount of concrete filling under the same support strength requirements, thus reducing the overall material cost.

[0018] Shorter construction period: Rapid installation and low-resistance advancement reduce the construction time of single-loop pipe roof, making it particularly suitable for shallow buried tunnels or emergency rescue projects with tight schedules.

[0019] 4. Enhanced adaptability and reliability: Wide applicability to complex strata: In special strata such as quicksand layers and extremely broken surrounding rocks, the ribs embedded in the borehole wall can form a "keyway effect", which enhances the synergistic effect between the pipe roof and the strata, and improves the accuracy of surface settlement control, which is superior to traditional construction methods.

[0020] 5. Reduce resource consumption: Structural optimization reduces the amount of steel and concrete used, which aligns with the concept of green construction.

[0021] Through structural innovation and process optimization, this invention achieves the core objectives of "high rigidity, high efficiency, low cost, and wide adaptability" of pipe roof support, providing reliable technical support for the safe passage of underground engineering through soft strata and has broad prospects for engineering applications. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a structural diagram of the tip section of the tube in this invention.

[0024] Figure 2 This is a structural diagram of the standard segment of the present invention.

[0025] Figure 3 This is a structural diagram of the top section of the pipe in this invention.

[0026] Figure 4 This is a cross-sectional view of the tip section of the tube in this invention.

[0027] Figure 5 This is a structural diagram of the connecting pipe of the present invention.

[0028] Figure 6 This is a main sectional view of the grouting section of the present invention.

[0029] Figure 7 For the present invention Figure 6 View from A in the middle.

[0030] In the figure: pipe tip section 1, standard section 2, pipe top section 3, hole wall 4, connecting pipe 5, advancing grouting section 6; First steel pipe body 101, first longitudinal rib plate 102, pipe tip 103, first grouting hole 104, first internal thread 105; Second steel pipe body 201, second longitudinal rib plate 202, second internal thread 203, second grouting hole 204, third internal thread 205; Third steel pipe body 301, third longitudinal rib plate 302, fourth internal thread 303, third grouting hole 304, fifth internal thread 305; External thread 501; Internal thread connecting pipe 601, hole sealing conical pipe 602, sixth internal thread 603, advancing grouting plate 604, pre-reserved grouting hole 605. DETAILED DESCRIPTION

[0031] The application will be further described in detail below through specific examples. The following examples can enable a person skilled in the art to have a more comprehensive understanding of the application, but do not limit the application in any way.

[0032] Example 1: Reference Figures 1-7 A tunnel engineering reinforced pipe roof pipe comprises a pipe tip section 1, the head end of the pipe tip section 1 is provided with a pipe tip 103, the outer wall of the pipe tip section 1 is provided with a first longitudinal rib plate 102, the tail end of the pipe tip section 1 is assembled and connected with a standard section 2 through a connecting pipe 5, the outer wall of the standard section 2 is provided with a second longitudinal rib plate 202, adjacent standard sections 2 are connected through the connecting pipe 5; the tail end of the last standard section 2 is assembled and connected with a pipe top section 3 through the connecting pipe 5, the outer wall of the pipe top section 3 is provided with a third longitudinal rib plate 302, the tail end of the pipe top section 3 is assembled and connected with an advancing grouting section 6 through the connecting pipe 5. The pipe roof pipe is aimed at extremely broken rock mass, quicksand layer, shallow buried and eccentrically loaded and other adverse geological conditions, through the combination structure of steel pipe and longitudinal rib plate, the bending stiffness and structural stability of the pipe roof support system are effectively improved, so as to completely solve the problems of insufficient strength and stiffness of the original single steel pipe grouting cement or the combination of steel pipe and steel reinforcement cage concrete; the rib arch effect is formed through the combination of longitudinal rib plate and steel pipe, the bending shear performance is significantly improved, especially in small pipe roof construction, the support capacity is significantly improved.

[0033] Further, the pipe tip section 1 comprises a first steel pipe body 101, a closed conical pipe tip 103 is arranged at the head end of the first steel pipe body 101, a first longitudinal rib plate 102 is uniformly fixed on the outer wall of the first steel pipe body 101 along the axial direction, a first internal thread 105 for mounting the connecting pipe 5 is arranged at the tail end of the first steel pipe body 101, and a plurality of first grout passing holes 104 are arranged on the first steel pipe body 101. By using the above-mentioned pipe tip section 1, the soil can be broken by the advancement of the pipe tip 103 during the support process, thereby achieving the purpose of drilling. The bending moment strength of the first steel pipe body 101 is enhanced by the first longitudinal rib plate 102.

[0034] Further, the standard section 2 comprises a second steel pipe body 201, a second internal thread 203 for mounting the connecting pipe 5 is arranged on the inner wall of the head end of the second steel pipe body 201, a second longitudinal rib plate 202 is uniformly fixed on the outer wall of the second steel pipe body 201 along the axial direction, a third internal thread 205 for mounting the connecting pipe 5 is arranged at the tail end of the second steel pipe body 201, and a plurality of second grout passing holes 204 are arranged on the second steel pipe body 201. By using the above-mentioned standard section 2, the corresponding number of standard sections 2 can be selectively used according to the depth of the support, and the assembly process is simplified by using the standard section 2.

[0035] Further, the pipe top section 3 comprises a third steel pipe body 301, a fourth internal thread 303 for mounting the connecting pipe 5 is arranged on the inner wall of the head end of the third steel pipe body 301, a third longitudinal rib plate 302 is uniformly fixed on the outer wall of the third steel pipe body 301 along the axial direction, a fifth internal thread 305 for mounting the connecting pipe 5 is arranged at the tail end of the third steel pipe body 301, and a plurality of third grout passing holes 304 are arranged on the third steel pipe body 301. The above-mentioned pipe top section 3 can be used for subsequent connection with the advancing equipment, thereby advancing the pipe shed pipe.

[0036] Further, the outer wall of the connecting pipe 5 is processed with a complete external thread 501. The connecting pipe 5 facilitates the assembly and connection between adjacent pipe tip sections 1, standard sections 2 and pipe top sections 3.

[0037] Further, the advancing grouting section 6 comprises an internal thread connecting pipe 601, a sixth internal thread 603 is arranged on the inner wall of the internal thread connecting pipe 601, an advancing grouting plate 604 is fixed at the end of the internal thread connecting pipe 601, a reserved grout hole 605 is arranged on the advancing grouting plate 604, and a sealing conical pipe 602 is not fixed on the outer end face of the advancing grouting plate 604 and the outside of the internal thread connecting pipe 601. The advancing grouting section 6 is connected with the advancing equipment, thereby advancing the operation, and facilitating subsequent grouting.

[0038] Further, the number of the first longitudinal rib plate 102, the second longitudinal rib plate 202 and the third longitudinal rib plate 302 is 4-12. By the above-mentioned different number of rib plates, different diameter of steel pipes can be adapted.

[0039] Further, the pipe tip section 1, the standard section 2 and the pipe top section 3 all adopt seamless steel pipes respectively, and the material is Q235 or higher strength steel; by the above-mentioned pipe material, the structural strength and stability are ensured.

[0040] Further, the first longitudinal rib plate 102, the second longitudinal rib plate 202 and the third longitudinal rib plate 302 adopt flat plates, T-shaped steel or L-shaped steel. By adopting different types of rib plates, the use flexibility is enhanced.

[0041] Further, the thickness of the first longitudinal rib plate 102, the second longitudinal rib plate 202 and the third longitudinal rib plate 302 is 5-10 mm, and the height is 1 / 5-1 / 3 of the pipe diameter. By the above-mentioned size, the best bending moment effect is ensured.

[0042] Embodiment 2: Another aspect of the present application provides a construction method of the tunnel engineering reinforced pipe shed pipe, comprising the following steps: Step 1, factory production of the reinforced pipe shed pipe: The standard modular pipe tip section 1, the standard section 2, the pipe top section 3, the connecting pipe 5 and the advancing grouting section 6 are made in advance in the factory building; Step 2, transportation of the reinforced pipe shed pipe: The prefabricated pipe tip section 1, the standard section 2, the pipe top section 3, the connecting pipe 5 and the advancing grouting section 6 are transported to the construction site; Step 3, advancing of the pipe tip section 1: The pipe tip section 1 is advanced along the drilled hole according to the position of the required support in advance, and the pipe tip section 1 is broken and advanced; Step 4, assembly and advancing of the standard section 2: After the pipe tip section 1 is installed, the standard section 2 is assembled and connected through the connecting pipe 5, and the required number of standard sections 2 are assembled according to the specific support requirements; Step 5, assembly and advancing of the pipe top section 3 and the advancing grouting section 6: After all the standard sections 2 are installed, the pipe top section 3 and the advancing grouting section 6 are assembled and connected through the connecting pipe 5; Step 6, grouting of the reinforced pipe shed pipe: The grouting equipment is connected to the tail of the advancing grouting section 6, the grouting equipment is started to grout the inside of the reinforced pipe shed pipe, and the grout enters between the reinforced pipe shed pipe and the hole wall of the drilled hole.

[0043] Embodiment 3: 1. The present application aims to protect a "steel pipe + equally divided longitudinal rib plate" foundation structure, including flat plates, T-shaped steel, L-shaped steel and various rib plate cross-section forms.

[0044] 2. Particularly protected is the embodiment of T-shaped steel as a longitudinal rib plate, with a flange width ≥ 30 mm and a web height ≥ 15 mm, and the bending stiffness is improved by the moment of inertia of the T-shaped cross-section; the welding angle of the T-shaped steel and the steel pipe, and the continuity of the weld between the rib plate and the steel pipe.

[0045] 3. Rib plate composite pipe forming process: the technology of producing ribbed steel pipes by hot rolling / cold drawing process in steel mills.

[0046] Example 4: According to engineering measurement, the sectional moment of inertia of the traditional Φ108mm steel pipe filled with concrete is only 1.2×10 4 mm 4 , and after adopting the four-rib plate structure of the present application, the sectional moment of inertia can be improved to 4.8×10 4 mm 4 , and the stiffness is improved by 300%.

[0047] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: 1. The present application utilizes the method of setting equally divided longitudinal rib plates on the periphery of the circular pipe to form an equally divided steel structure combination of steel pipes and steel plates, thereby forming a steel structure body with greatly improved strength and stiffness; 2. The equal division of the longitudinal rib plates on the structure body can be flexibly arranged in any equal division according to the pipe diameter size and the structural strength and stiffness requirements; 3. The longitudinal rib plates of the structure body can be steel plates of a certain thickness, or T-shaped or L-shaped profiles of a certain plate thickness, to ensure that the structure body has sufficient strength and stiffness to withstand the rock and soil deformation pressure from the top and sides; 4. The pipe shed stiffness of the present application can be designed by the grading method, and the stiffness can be adjusted by adjusting the number of rib plates (4-12 pieces) and the cross-section form (flat plate / T-shaped / L-shaped); 5. The present application first applies the "keyway effect", which utilizes the mechanical engagement of the rib plate and the formation to improve the cooperative bearing performance; 6. The rib plates on the structure body can be produced by continuous welding or intermittent welding, or the steel mill can use hot rolling / cold drawing integrated forming process to solve the problem of welding deformation control; 7. The inner and outer diameters of the structure body are processed according to the existing standard drill bit and drill pipe size system, to ensure that the existing equipment can be fully utilized for drilling and construction operations; 8. The structure of the present application is composed of a pipe tip section, a standard section, a pipe top end, a connecting sleeve, a pushing and grouting section, which are all connected by unified screw threads, facilitating installation and later grouting; 9. In the process of installing the pipe shed, the split body such as the rib plate can effectively support, and only when the split rib plate slides on the hole wall can the sliding resistance be effectively reduced, facilitating the installation of the pipe shed; 10. The structure of the present application can be used as an internal reinforcing structure of the pipe or a larger pipe shed pipe, and is inserted in the pipe to replace the steel reinforcement cage.

[0048] Although the preferred embodiments of the present application are described above in combination with the drawings, the present application is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative and not restrictive. Those skilled in the art can make many specific changes under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and these all belong to the protection scope of the present application.

Claims

1. A reinforced pipe roof for tunnel engineering, characterized in that, The pipe includes a pipe tip section (1), with a pipe tip (103) at one end of the pipe tip section (1), a first longitudinal stiffener (102) on the outer wall of the pipe tip section (1), and a standard section (2) assembled and connected to the tail of the pipe tip section (1) via a connecting pipe (5). A second longitudinal stiffener (202) is provided on the outer wall of the standard section (2), and adjacent standard sections (2) are assembled and connected via a connecting pipe (5). The tail of the last standard section (2) is assembled and connected to the top section (3) via a connecting pipe (5), and a third longitudinal stiffener (302) is provided on the outer wall of the top section (3). The tail of the top section (3) is assembled and connected to the grouting section (6) via a connecting pipe (5).

2. The reinforced pipe roof pipe for tunnel engineering according to claim 1, characterized in that, The pipe tip section (1) includes a first steel pipe body (101), the head end of the first steel pipe body (101) adopts a closed conical pipe tip (103), the outer wall of the first steel pipe body (101) is uniformly fixed with a first longitudinal stiffener (102) along the axial direction, the tail end of the first steel pipe body (101) is machined with a first internal thread (105) for installing a connecting pipe (5), and multiple sets of first slurry passage holes (104) are machined on the first steel pipe body (101).

3. The reinforced pipe roof pipe for tunnel engineering according to claim 1, characterized in that, The standard section (2) includes a second steel pipe body (201). The inner wall of the head end of the second steel pipe body (201) is machined with a second internal thread (203) for installing a connecting pipe (5). The outer wall of the second steel pipe body (201) is uniformly fixed with a second longitudinal stiffener (202) along the axial direction. The tail end of the second steel pipe body (201) is machined with a third internal thread (205) for installing a connecting pipe (5). Multiple sets of second slurry passage holes (204) are machined on the second steel pipe body (201).

4. The reinforced pipe roof pipe for tunnel engineering according to claim 1, characterized in that, The top section (3) of the pipe includes a third steel pipe body (301). The inner wall of the head end of the third steel pipe body (301) is machined with a fourth internal thread (303) for installing a connecting pipe (5). The outer wall of the third steel pipe body (301) is uniformly fixed with a third longitudinal stiffener (302) along the axial direction. The tail end of the third steel pipe body (301) is machined with a fifth internal thread (305) for installing a connecting pipe (5). Multiple sets of third slurry passage holes (304) are machined on the third steel pipe body (301).

5. The reinforced pipe roof pipe for tunnel engineering according to claim 1, characterized in that, The outer wall of the connecting pipe (5) is machined with a complete external thread (501).

6. The reinforced pipe roof pipe for tunnel engineering according to claim 1, characterized in that, The grouting section (6) includes an internally threaded connecting pipe (601), the inner wall of which is machined with a sixth internal thread (603), and the end of the internally threaded connecting pipe (601) is fixed with a grouting plate (604). The grouting plate (604) is machined with a reserved grouting hole (605). The outer end face of the grouting plate (604) is not fixed with a sealing tapered pipe (602) to the outside of the internally threaded connecting pipe (601).

7. The reinforced pipe roof pipe for tunnel engineering according to claim 1, characterized in that, The number of the first longitudinal stiffener (102), the second longitudinal stiffener (202) and the third longitudinal stiffener (302) is 4 to 12 pieces.

8. The reinforced pipe roof pipe for tunnel engineering according to claim 1, characterized in that, The pipe tip section (1), standard section (2) and pipe top section (3) are all made of seamless steel pipe, and the material is Q235 or higher strength steel. The first longitudinal stiffener (102), the second longitudinal stiffener (202) and the third longitudinal stiffener (302) are made of flat plate, T-shaped steel or L-shaped steel.

9. The reinforced pipe roof pipe for tunnel engineering according to claim 1, characterized in that, The thickness of the first longitudinal stiffener (102), the second longitudinal stiffener (202) and the third longitudinal stiffener (302) is 5~10mm, and the height is 1 / 5-1 / 3 of the pipe diameter.

10. A construction method for a reinforced pipe roof in tunnel engineering according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1, Factory production of reinforced pipe roof pipes: Standard modular pipe tip section (1), standard section (2), pipe top section (3), connecting pipe (5) and grouting section (6) are prefabricated in the factory. Step 2, Transportation of reinforced pipe roof pipes: The prefabricated pipe tip section (1), standard section (2), pipe top section (3), connecting pipe (5) and grouting section (6) are transported to the construction site; Step 3, advancement of the tube tip (1): Drill holes in advance, and advance the pipe tip (1) along the drill hole in advance according to the location of the required support. The pipe tip (1) is used to break through the soil and advance the pipe. Step 4, Assembly of standard segment (2): After the pipe tip (1) is installed, the standard section (2) is assembled and connected through the connecting pipe (5), and an appropriate number of standard sections (2) are assembled according to the specific support requirements. Step 5, Assembly and advancement of the pipe top section (3) and the grouting section (6): After all standard sections (2) are installed, the pipe top section (3) and the grouting section (6) are assembled through the connecting pipe (5). Step 6, Grouting of reinforced pipe roof pipes: Connect the grouting equipment to the tail of the grouting section (6), start the grouting equipment to grout the inside of the reinforced pipe roof, and the grout enters the space between the reinforced pipe roof and the borehole wall at the same time.

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