Tunnel engineering reinforced pipe roof pipe

Abstract

The utility model provides a kind of tunnel engineering reinforced pipe roof pipe, belong to tunnel construction technical field, the head of pipe tip section is provided with pipe tip, the outer wall of pipe tip section is provided with first longitudinal rib plate, the tail of pipe tip section is connected with standard section by connecting pipe assembly, the outer wall of standard section is provided with second longitudinal rib plate, adjacent standard section is connected by connecting pipe assembly;The tail of last standard section is connected pipe top section by connecting pipe assembly, the outer wall of pipe top section is provided with third longitudinal rib plate, the tail of pipe top section is connected to advance grouting section by connecting pipe assembly. Through steel pipe and longitudinal rib plate combination structure, the bending stiffness and structural stability of pipe roof support system are effectively improved, so that the strength, stiffness problem of original separate steel pipe grouting cement or steel pipe+reinforcing cage concrete combination is completely solved.

Description

Technical Field

[0001] This utility model belongs to the field of advanced support technology for underground engineering, and in particular relates to a reinforced pipe roof pipe for tunnel engineering. Background Technology

[0002] To prevent surface subsidence and surrounding rock loosening caused by tunnel or underground tunnel excavation, thick-walled steel pipes are driven into the upper half of the excavation face and around its sidewalls at the excavation front. Temporary support structures built into the strata are used for pre-excavation support to prevent soil collapse and surface subsidence during excavation, ensuring the safe operation of excavation and subsequent support processes. The rigidity of the pipe roof plays a decisive role in the quality of the pre-support. To increase the rigidity of the steel pipes, the commonly used technical measures are: Grouting-reinforced pipe roof: The existing perforated pipe grouting technology can only locally consolidate the soft strata around the pipe, and has almost no impact on the rigidity of the overall support structure. Due to the limitation of the borehole diameter, the only way to increase the rigidity of the overall structure is to increase the number of pipe roofs by increasing the density of boreholes. This method has the disadvantages of low construction efficiency, great impact on the construction site environment, high labor intensity of personnel, and high construction cost for pipe roof construction. Built-in reinforced pipe shed: The existing method uses steel pipes with built-in steel bars or steel cages, then presses concrete into the steel pipes and injects cement grout. The built-in steel bars or steel cages are all circular cross sections, which cannot form strong rigidity. They are far less rigid than 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 rigidity be made up. This method also has disadvantages such as low construction efficiency, large environmental impact, increased labor intensity, and increased construction costs. Utility Model Content The purpose of this utility model is to provide a reinforced pipe roof for tunnel engineering. This pipe roof is designed for adverse geological conditions such as extremely fractured rock masses, quicksand layers, and shallow burial with bias pressure. Through the combination of steel pipe and longitudinal stiffener plate, it effectively improves the bending stiffness and structural stability of the pipe roof support system, thereby completely solving the problems of insufficient strength and stiffness of the original single steel pipe with cement grout or steel pipe + reinforced cage concrete combination. The combination of longitudinal stiffener plate and steel pipe forms a rib arch effect, which significantly improves the bending and shear resistance, especially in the construction of small pipe roofs, where the support capacity is significantly improved.

[0003] To achieve the above-mentioned technical features, the purpose of this utility model is as follows: A reinforced pipe roof for tunnel engineering includes a pipe tip section, with a pipe tip at one end of the pipe tip section, a first longitudinal stiffener on the outer wall of the pipe tip section, and a standard section assembled and connected to the tail of the pipe tip section via a connecting pipe. The outer wall of the standard section is provided with a second longitudinal stiffener, and adjacent standard sections are assembled and connected via connecting pipes. The tail of the last standard section is assembled and connected to the top section via a connecting pipe, and the outer wall of the top section is provided with a third longitudinal stiffener. The tail of the top section is assembled and connected to the grouting section via a connecting pipe.

[0004] Preferably, the pipe tip section includes a first steel pipe body, the head end of the first steel pipe body adopts a closed conical pipe tip, the outer wall of the first steel pipe body is uniformly fixed with a first longitudinal stiffener along the axial direction, the tail end of the first steel pipe body is machined with a first internal thread for installing a connecting pipe, and multiple sets of first slurry passage holes are machined on the first steel pipe body.

[0005] Preferably, the standard section includes a second steel pipe body, the inner wall of one head end of the second steel pipe body is machined with a second internal thread for installing a connecting pipe, the outer wall of the second steel pipe body is uniformly fixed with a second longitudinal stiffener along the axial direction, the tail end of the second steel pipe body is machined with a third internal thread for installing a connecting pipe, and multiple sets of second slurry passage holes are machined on the second steel pipe body.

[0006] Preferably, the top section of the pipe includes a third steel pipe body, the inner wall of one end of the third steel pipe body is machined with a fourth internal thread for installing a connecting pipe, the outer wall of the third steel pipe body is uniformly fixed with a third longitudinal stiffener along the axial direction, the tail end of the third steel pipe body is machined with a fifth internal thread for installing a connecting pipe, and multiple sets of third slurry passage holes are machined on the third steel pipe body.

[0007] Preferably, the outer wall of the connecting pipe is machined with complete external threads.

[0008] Preferably, the grouting section includes an internally threaded connecting pipe, the inner wall of which is machined with a sixth internal thread, and a grouting plate is fixed to the end of the internally threaded connecting pipe. A pre-reserved grouting hole is machined on the grouting plate, and the outer end face of the grouting plate is not fixed with a sealing tapered pipe to the outside of the internally threaded connecting pipe.

[0009] Preferably, the number of the first longitudinal stiffener, the second longitudinal stiffener, and the third longitudinal stiffener is 4 to 12 pieces.

[0010] Preferably, the tip section, standard section and top section are all made of seamless steel pipe, and the material is Q235 or higher strength steel; The first longitudinal stiffener, the second longitudinal stiffener, and the third longitudinal stiffener are made of flat plate, T-shaped steel, or L-shaped steel.

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

[0012] The present invention has the following beneficial effects: 1. Overall improvement in structural performance: Stiffness and strength are doubled: By combining steel pipes with longitudinal stiffening plates, a bending section similar to an "I-beam" is formed, which significantly improves the bending and shear resistance of the overall structure and reduces the number of pipe sheds.

[0013] 2. Construction efficiency and convenience are significantly improved: Standardized and rapid installation: The segmented threaded connection replaces the traditional welding process, shortening the time required to extend a single pipe section, improving efficiency, and eliminating the need for large welding equipment, thus reducing the complexity of on-site operations.

[0014] Low-resistance propulsion design: The stiffening plate contacts the hole wall only along the bisecting lines, rather than the traditional friction of the entire circumference of the steel pipe, thus reducing propulsion resistance, making it especially suitable for pipe roof construction with a distance of >20m.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 5. Reduce resource consumption: Structural optimization reduces the amount of steel and concrete used, which aligns with the concept of green construction.

[0020] Through structural innovation and process optimization, this utility model 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 engineering application prospects. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a structural diagram of the tip section of the tube in this utility model.

[0023] Figure 2 This is a structural diagram of the standard segment of this utility model.

[0024] Figure 3 This is a structural diagram of the top section of the pipe in this utility model.

[0025] Figure 4 This is a cross-sectional view of the tip section of the tube in this utility model.

[0026] Figure 5 This is a structural diagram of the connecting pipe of this utility model.

[0027] Figure 6 This is a main sectional view of the grouting section of this utility model.

[0028] Figure 7 This utility model Figure 6 View from direction A.

[0029] In the diagram: 1. Pipe tip section; 2. Standard section; 3. Pipe top section; 4. Hole wall; 5. Connecting pipe; 6. Grouting section. First steel pipe body 101, first longitudinal stiffening plate 102, pipe tip 103, first grout passage hole 104, first internal thread 105; Second steel pipe body 201, second longitudinal stiffening plate 202, second internal thread 203, second grout passage hole 204, third internal thread 205; The third steel pipe body 301, the third longitudinal stiffening plate 302, the fourth internal thread 303, the third grout passage hole 304, and the fifth internal thread 305; External thread 501; Internal threaded connecting pipe 601, sealing tapered pipe 602, sixth internal thread 603, grouting plate 604, reserved grouting hole 605. Detailed Implementation

[0030] The present invention will be further described in detail below through specific embodiments. These embodiments are intended to enable those skilled in the art to gain a more comprehensive understanding of the present invention, but do not limit the present invention in any way.

[0031] Example 1: See Figure 1-7A reinforced pipe roof for tunnel engineering includes a pipe tip section 1, with a pipe tip 103 at one end of the pipe tip section 1. The outer wall of the pipe tip section 1 is provided with a first longitudinal stiffener 102. The tail of the pipe tip section 1 is assembled and connected to a standard section 2 via a connecting pipe 5. The outer wall of the standard section 2 is provided with a second longitudinal stiffener 202. Adjacent standard sections 2 are assembled and connected via connecting pipe 5. The tail of the last standard section 2 is assembled and connected to a pipe top section 3 via connecting pipe 5. The outer wall of the pipe top section 3 is provided with a third longitudinal stiffener 302. The tail of the pipe top section 3 is assembled and connected to a grouting section 6 via connecting pipe 5. This pipe roof system is designed for adverse geological conditions such as extremely fractured rock masses, quicksand layers, and shallow burial with bias pressure. Through a combination of steel pipes and longitudinal stiffeners, it effectively improves the bending stiffness and structural stability of the pipe roof support system, thereby completely solving the problems of insufficient strength and stiffness of the original single steel pipe with cement grout or steel pipe + reinforced concrete cage combination. The combination of longitudinal stiffeners and steel pipes forms a rib arch effect, which significantly improves the bending and shear resistance, especially in the construction of small pipe roofs, where the support capacity is significantly improved.

[0032] Furthermore, the pipe tip section 1 includes a first steel pipe body 101. One end of the first steel pipe body 101 has a closed, tapered pipe tip 103. The outer wall of the first steel pipe body 101 is uniformly fixed with first longitudinal stiffeners 102 along the axial direction. One end of the first steel pipe body 101 has a first internal thread 105 for installing a connecting pipe 5. Multiple sets of first grout passage holes 104 are machined on the first steel pipe body 101. By employing the aforementioned pipe tip section 1, it is convenient to break through the soil by advancing the pipe tip 103 during the support process, thereby achieving the purpose of drilling. The first longitudinal stiffeners 102 enhance the bending moment resistance of the first steel pipe body 101.

[0033] Furthermore, the standard section 2 includes a second steel pipe body 201. The inner wall of one head end of the second steel pipe body 201 is machined with a second internal thread 203 for installing the connecting pipe 5. The outer wall of the second steel pipe body 201 is uniformly fixed with second longitudinal stiffeners 202 along the axial direction. One tail end of the second steel pipe body 201 is machined with a third internal thread 205 for installing the connecting pipe 5. Multiple sets of second grout passage holes 204 are machined on the second steel pipe body 201. By using the aforementioned standard section 2, it is convenient to selectively use the appropriate number of standard sections 2 according to the depth of the support, and the use of standard section 2 simplifies the assembly process.

[0034] Furthermore, the top section 3 includes a third steel pipe body 301. The inner wall of one 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 third longitudinal stiffeners 302 along the axial direction. One tail end of the third steel pipe body 301 is machined with a fifth internal thread 305 for installing the connecting pipe 5. Multiple sets of third slurry passage holes 304 are machined on the third steel pipe body 301. The aforementioned top section 3 can be used to connect with subsequent propulsion equipment for advancing the pipe roof pipe.

[0035] Furthermore, the outer wall of the connecting pipe 5 is machined with a complete external thread 501. The connecting pipe 5 facilitates the assembly and connection between adjacent pipe tip section 1, standard section 2 and pipe top section 3.

[0036] Furthermore, the propulsion grouting section 6 includes an internally threaded connecting pipe 601. The inner wall of the internally threaded connecting pipe 601 is machined with a sixth internal thread 603. A propulsion grouting plate 604 is fixed to the end of the internally threaded connecting pipe 601. A pre-drilled grouting hole 605 is machined on the upper part of the propulsion grouting plate 604. A sealing tapered pipe 602 is fixed to the outside of the internally threaded connecting pipe 601. The propulsion grouting section 6 facilitates connection with the propulsion equipment for propulsion operations and also facilitates subsequent grouting.

[0037] Furthermore, the number of the first longitudinal stiffener 102, the second longitudinal stiffener 202, and the third longitudinal stiffener 302 is 4 to 12. By using different numbers of stiffeners, it is possible to accommodate steel pipes of different diameters.

[0038] Furthermore, the pipe tip section 1, standard section 2, and pipe top section 3 are all made of seamless steel pipe, with the material being Q235 or higher strength steel; the aforementioned pipe materials ensure its structural strength and stability.

[0039] Furthermore, the first longitudinal stiffener 102, the second longitudinal stiffener 202, and the third longitudinal stiffener 302 are made of flat plates, T-shaped steel, or L-shaped steel. By using different types of stiffeners, the flexibility of use is enhanced.

[0040] Furthermore, 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 to 1 / 3 of the pipe diameter. These dimensions ensure optimal bending moment resistance.

[0041] Example 2: Another aspect of this utility model provides a construction method for reinforced pipe roof pipes in tunnel engineering, including 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 were transported to the construction site. Step 3, Advancement of the tip segment 1: Drill holes in advance, and advance the pipe tip 1 along the drill hole according to the required support location, and advance the pipe tip 1 through the soil. Step 4, Assembly of Standard Segment 2: After the pipe tip 1 is installed, the standard section 2 is connected by 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 top section 3 and the grouting section 6 are assembled and advanced 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 will enter the space between the reinforced pipe roof and the borehole wall at the same time.

[0042] Example 3: 1. This utility model aims to protect a basic structure of "steel pipe + equally divided longitudinal stiffening plate", including various stiffening plate cross-sectional forms such as flat plate, T-shaped steel, and L-shaped steel.

[0043] 2. Special protection is provided for the implementation of T-shaped steel as longitudinal stiffeners, with a flange width ≥30mm and a web height ≥15mm. The bending stiffness is improved by the moment of inertia of the T-section; the welding angle between the T-shaped steel and the steel pipe, and the continuity of the weld between the stiffener and the steel pipe.

[0044] 3. Ribbed composite pipe forming process: This technology protects steel mills by enabling them to produce ribbed steel pipes in one go through hot rolling / cold drawing processes.

[0045] Example 4: According to engineering measurements, the moment of inertia of the section of a traditional Φ108mm steel pipe filled with concrete is only 1.2×10. 4 mm 4 Furthermore, for the same pipe diameter, the moment of inertia of the cross-section can be increased to 4.8 × 10⁻⁶ after adopting the four-ribbed structure of this utility model. 4 mm 4 Stiffness is increased by 300%.

[0046] To achieve the above objectives, the technical solution of this utility model is implemented as follows: 1. This utility model utilizes the method of setting equally divided longitudinal stiffening plates around the periphery of a circular tube to form an equally divided steel structure assembly of steel tube and steel plate, thereby forming a steel structure with greatly improved strength and stiffness; 2. The longitudinal stiffeners on the structure of this utility model can be flexibly arranged into any equal division according to the pipe diameter and the structural strength and stiffness requirements; 3. The longitudinal stiffeners of the structure of this utility model can be steel plates of a certain thickness, or T-shaped or L-shaped profiles of a certain thickness, to ensure that the structure has sufficient strength and rigidity to withstand the deformation pressure of soil and rock from the top and sides. 4. The rigidity of the pipe roof of this utility model can be designed in a graded manner, and the rigidity can be adjusted by adjusting the number of stiffening plates (4-12 pieces) and the cross-sectional shape (flat plate / T-type / L-type); 5. This utility model is the first to apply the "keyway effect", which utilizes the mechanical interlocking between the stiffening plate and the stratum to improve the synergistic load-bearing performance; 6. The stiffening plates on the structure of this utility model can be produced by continuous welding or intermittent welding, or the steel mill can use a hot rolling / cold drawing integrated forming process to solve the problem of welding deformation control; 7. The inner and outer diameter dimensions of the structure of this utility model are processed according to the existing standard drill bit and drill rod size system to ensure that existing equipment can be fully utilized for drilling operations; 8. The structure of this utility model consists of a pipe tip section, a standard section, a pipe top section, a connecting sleeve, and a propulsion and grouting section, all of which use threaded connections of uniform specifications, facilitating installation and subsequent grouting; 9. During the installation of the pipe roof, the equally divided stiffening plates can play an effective supporting role. Only the equally divided stiffening plates slide on the hole wall, which effectively reduces the sliding resistance and facilitates the installation of the pipe roof. 10. The structure of this utility model can be used as an internal reinforcing structure for pipes or larger pipe sheds, inserted inside the pipe, to replace the steel cage.

[0047] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many specific modifications under the guidance of the present invention without departing from the spirit and scope of the claims, and these modifications all fall within the scope of protection of the present invention.

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.

9. The reinforced pipe roof pipe for tunnel engineering according to claim 1, characterized in that, 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.

10. 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.

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