Reinforcing method for enhancing stability of invert structure of high-stress soft rock tunnel

Abstract

The present application relates to the technical field of tunnel excavation, and discloses a reinforcing method for enhancing the stability of a tunnel invert structure in high-stress soft rock, which comprises the following steps: S1, performing invert excavation and base cleaning in the tunnel; S2, assembling an invert end mold, a filling end mold, an invert side mold, an invert belly mold and a hoisting mechanism in sequence; S3, connecting the assembled reinforcing auxiliary device with a tunnel excavation device or a material transport vehicle and other moving mechanisms in the tunnel; S4, reinforcing the invert in the tunnel by means of the reinforcing auxiliary device; and S5, shifting the position of the reinforcing auxiliary device by means of the tunnel excavation device or the material transport vehicle after the invert reinforcement work in the current area is completed. The present application makes it unnecessary to frequently disassemble and assemble the tunnel invert reinforcing device when reinforcing the tunnel, so that the tunnel invert reinforcing process is simpler and more convenient.

Description

Technical Field

[0001] This invention relates to the field of tunnel excavation technology, and in particular to a reinforcement method for enhancing the stability of the invert arch structure of a soft rock tunnel under high ground stress. Background Technology

[0002] Tunnels excavated under high ground stress and soft rock conditions are prone to deformation under the influence of high ground stress and weak surrounding rock. Under the action of vertical tectonic stress, the tunnel invert is prone to heave, which will affect the stability of the overall tunnel structure. Therefore, it is necessary to enhance the stability of the tunnel invert support structure during construction. To solve this problem, the invert is excavated, the soil is removed, then a circumferential steel frame is laid and shotcrete is applied, and finally concrete is poured to strengthen the bottom of the entire tunnel, thereby preventing the tunnel invert from heaving.

[0003] During construction, the process involves a series of steps, including invert arch excavation, foundation cleaning, installation of invert arch end formwork, laying of steel mesh, installation of invert arch belly formwork and side formwork, pouring of invert arch concrete, removal and installation of invert arch belly formwork, installation of filling end formwork, pouring of invert arch filling layer, and removal of all formwork. The reinforcement of the invert arch for each section of the tunnel requires repeating these steps, making the entire process cumbersome, time-consuming, and inconvenient. Therefore, it is necessary to propose a reinforcement method to enhance the stability of the invert arch structure in high-stress soft rock tunnels. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a reinforcement method for enhancing the stability of the invert arch structure of a soft rock tunnel under high ground stress.

[0005] The present invention is achieved by the following technical solution: S1: Excavation of the invert arch and cleaning of the foundation are carried out inside the tunnel;

[0006] S2: The invert arch end mold, filling end mold, invert arch side mold, invert arch belly mold, and lifting mechanism are assembled in sequence.

[0007] S3: Connect the assembled reinforcement auxiliary device to the excavation equipment or material transport vehicle and other mobile mechanisms inside the tunnel;

[0008] S4: Reinforce the invert arch inside the tunnel using reinforcement auxiliary devices;

[0009] S5: After the arch reinforcement work in the current area is completed, the location of the reinforcement auxiliary device will be moved by the excavation equipment or material transport vehicle;

[0010] The reinforcement auxiliary device includes an invert arch end mold, on which two connecting rings are fixedly installed. A filling end mold is installed on the invert arch end mold, and two invert arch side molds are installed on the invert arch end mold. An invert arch belly mold is rotatably installed on each of the two invert arch side molds. Multiple pouring ports are opened on the invert arch belly mold. Two lifting mechanisms are installed on the filling end mold. The lifting mechanism includes a vertical rod installed on the filling end mold. An L-shaped boom is hinged to the top of the vertical rod. A hydraulic cylinder is hinged to the vertical rod. The output rod of the hydraulic cylinder is hinged to the L-shaped boom. A steel wire rope is fixedly connected to the L-shaped boom. The bottom end of the steel wire rope is connected to the invert arch belly mold.

[0011] The invert end mold consists of two parts, left and right. Two clip frames are fixedly installed on one side of the invert end mold, and the same clip is slidably inserted into the two clip frames.

[0012] The bottom of the arch end mold has a first slot, and the bottom of the filling end mold extends into the first slot and is slidably connected to the first slot.

[0013] The filling end mold consists of two parts, left and right, and the two parts of the filling end mold are connected at one end with a convex and concave engagement structure.

[0014] A second slot is provided on both sides of the inverted arch end mold, and one end of each of the two inverted arch side molds extends into the corresponding second slot and is slidably connected to the second slot.

[0015] Two insert frames are fixedly installed on the end formwork of the invert arch, and two insert blocks are fixedly installed on the side formwork of the two invert arches. The two insert blocks pass through the corresponding insert frames and are slidably connected to the corresponding insert frames. Four screws distributed in a rectangular pattern are threaded on the insert frames and insert blocks.

[0016] Two shaft brackets are fixedly installed on the side formwork of the invert arch, and a connecting arm is rotatably installed on each of the two shaft brackets. The bottom ends of the two connecting arms are fixedly connected to the belly formwork of the invert arch.

[0017] Two inserts are fixedly installed on one side of the filling end mold, and the bottom ends of the two vertical rods extend into the corresponding inserts and slide to connect with the corresponding inserts.

[0018] As a further improvement to the above scheme, a hook is fixedly installed at the bottom of the wire rope, and a lifting ring is fixedly installed on the invert arch formwork, with the hook and the lifting ring connected.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] This invention comprises an integrated tunnel invert reinforcement auxiliary device consisting of an invert end mold, a frame, a clip, a first slot, a filling end mold, a second slot, and an invert side mold. This allows the invert reinforcement auxiliary device to be moved as a whole while ensuring the normal implementation of the tunnel invert reinforcement project. This eliminates the need for frequent disassembly and assembly of the invert reinforcement auxiliary device during invert reinforcement work, making the tunnel invert reinforcement construction method simpler and more convenient.

[0021] The lifting mechanism, consisting of vertical rods, L-shaped booms, hydraulic cylinders, and steel wire ropes, can automatically flip over the two invert arch formworks, so that the invert arch reinforcement work can be carried out at different stages without disassembling and assembling the invert arch formworks, thus simplifying the reinforcement work of the tunnel invert arch. Attached Figure Description

[0022] Figure 1 This is a front-view structural schematic diagram of the reinforcement method for enhancing the stability of the invert arch structure of a soft rock tunnel under high ground stress according to the present invention.

[0023] Figure 2 This is a rear-view structural schematic diagram of the reinforcement method for enhancing the stability of the invert arch structure of a soft rock tunnel under high ground stress, as described in this invention.

[0024] Figure 3 This is a first disassembly illustration of the reinforcement method for enhancing the stability of the invert arch structure of a soft rock tunnel under high ground stress according to the present invention.

[0025] Figure 4 This is a second disassembly illustration of the reinforcement method for enhancing the stability of the invert arch structure of a soft rock tunnel under high ground stress according to the present invention.

[0026] Figure 5 This is the third disassembly illustration of the reinforcement method for enhancing the stability of the invert arch structure of a soft rock tunnel under high ground stress, as described in this invention.

[0027] Explanation of key symbols:

[0028] 1. Invert arch end formwork; 2. Frame; 3. Clip; 4. Connecting ring; 5. First slot; 6. Filling end formwork; 7. Second slot; 8. Invert arch side formwork; 9. Insert frame; 10. Insert block; 11. Shaft bracket; 12. Connecting arm; 13. Invert arch belly formwork; 14. Pouring port; 15. Insert cylinder; 16. Vertical rod; 17. L-shaped boom; 18. Hydraulic cylinder; 19. Steel wire rope. Detailed Implementation

[0029] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0030] Please combine Figures 1 to 5The reinforcement method for enhancing the stability of the invert arch structure of a soft rock tunnel under high ground stress in this embodiment includes: S1: excavating the invert arch and cleaning the foundation inside the tunnel;

[0031] S2: The invert arch end mold, filling end mold, invert arch side mold, invert arch belly mold, and lifting mechanism are assembled in sequence.

[0032] S3: Connect the assembled reinforcement auxiliary device to the excavation equipment or material transport vehicle and other mobile mechanisms inside the tunnel;

[0033] S4: Reinforce the invert arch inside the tunnel using reinforcement auxiliary devices;

[0034] S5: After the arch reinforcement work in the current area is completed, the location of the reinforcement auxiliary device will be moved by the excavation equipment or material transport vehicle;

[0035] The reinforcement auxiliary device includes an inverted arch end mold 1, on which two connecting rings 4 are fixedly installed. A filling end mold 6 is installed on the inverted arch end mold 1, and two inverted arch side molds 8 are installed on the inverted arch end mold 1. An inverted arch belly mold 13 is rotatably installed on each of the two inverted arch side molds 8. Multiple pouring ports 14 are opened on the inverted arch belly mold 13. Two lifting mechanisms are installed on the filling end mold 6. The lifting mechanism includes a vertical rod 16 installed on the filling end mold 6. An L-shaped boom 17 is hinged to the top of the vertical rod 16. A hydraulic cylinder 18 is hinged to the vertical rod 16. The output rod of the hydraulic cylinder 18 is hinged to the L-shaped boom 17. A steel wire rope 19 is fixedly connected to the L-shaped boom 17. The bottom end of the steel wire rope 19 is connected to the inverted arch belly mold 13.

[0036] The invert end mold 1 consists of two parts, left and right. Two clip frames 2 are fixedly installed on one side of the invert end mold 1, and the same clip 3 is slidably inserted into the two clip frames 2.

[0037] Through the above technical solution, the invert end mold 1 is composed of two parts, which makes it possible to disassemble it, thus making it more convenient to transport. The two clamping frames 2, together with the clamping parts 3, can stably assemble the two parts of the invert end mold 1 into a whole.

[0038] The bottom of the arch end mold 1 is provided with a first slot 5, and the bottom of the filling end mold 6 extends into the first slot 5 and is slidably connected to the first slot 5.

[0039] Through the above technical solution, the first slot 5, together with the filling end mold 6, enables the invert end mold 1 to not only limit the filling end mold 6, but also allows the filling end mold 6 to be flipped over to improve the overall stability of the invert end mold 1.

[0040] The filling end mold 6 consists of two parts, left and right, and the two parts of the filling end mold 6 are connected at one end with a convex and concave engagement structure.

[0041] Through the above technical solution, the filling end mold 6 can be disassembled, which makes it easier to transfer. The splicing structure of the two filling end molds 6 allows them to work with the clip 3 to improve the stability of the invert end mold 1.

[0042] The two sides of the inverted arch end mold 1 are provided with second slots 7, and one end of the two inverted arch side molds 8 extends into the corresponding second slots 7 and is slidably connected to the second slots 7.

[0043] Through the above technical solution, the second slot 7 allows the invert end mold 1 and the invert side mold 8 to be better assembled and spliced.

[0044] Two insert frames 9 are fixedly installed on the corresponding invert end mold 1, and two insert blocks 10 are fixedly installed on the two invert side molds 8. The two insert blocks 10 pass through the corresponding insert frames 9 and are slidably connected to the corresponding insert frames 9. Four screws distributed in a rectangular pattern are threaded on the insert frames 9 and the insert blocks 10.

[0045] Through the above technical solution, the insert frame 9, together with the insert block 10 and screws, enables the invert arch side mold 8 to not only form a stable whole with the invert arch end mold 1, but also to be easily separated from it.

[0046] Two shaft brackets 11 are fixedly installed on the side mold 8 of the inverted arch. Connecting arms 12 are rotatably installed on both shaft brackets 11, and the bottom ends of the two connecting arms 12 are fixedly connected to the belly mold 13 of the inverted arch.

[0047] Through the above technical solution, the shaft frame 11 is provided with shaft grooves, and the connecting arm 12 is provided with two shaft rods. This allows the connecting arm 12 to be mounted on the shaft frame 11 through the shaft rods, so that the inverted arch mold 13 can be rotated with the shaft frame 11 as the axis, and at the same time, the two can be easily separated.

[0048] Two inserts 15 are fixedly installed on one side of the filling end mold 6, and the bottom ends of the two vertical rods 16 extend into the corresponding inserts 15 and slide to connect with the corresponding inserts 15.

[0049] Through the above technical solution, the insert 15 realizes the assembly of the lifting device and the reinforcement auxiliary device, while also allowing the lifting device to be easily dismantled.

[0050] A hook is fixedly installed at the bottom of the wire rope 19, and a lifting ring is fixedly installed on the invert arch formwork 13, with the hook connected to the lifting ring.

[0051] Through the above technical solution, the hook and the lifting ring can be used to make the wire rope 19 on the lifting device easy to connect with the invert arch formwork 13.

[0052] The implementation principle of a reinforcement method for enhancing the stability of the invert arch structure of a soft rock tunnel under high ground stress in this application embodiment is as follows:

[0053] First step: After completing the excavation of the invert arch and the cleaning of the foundation inside the tunnel, deploy the invert arch end formwork 1 and insert the clips 3 into the two clip frames 2 to fix the two parts of the invert arch end formwork 1. Then, insert the filling end formwork 6 into the first slot 5 on the invert arch end formwork 1. Then, complete the installation of the invert arch side formwork 8, the invert arch belly formwork 13 and the lifting mechanism to assemble the entire reinforcement auxiliary device into a whole. Then, connect the excavation device or material transport vehicle to the two connecting rings 4 with steel wire.

[0054] The second step: When reinforcing the invert arch of the tunnel, two lifting devices are activated. Two hydraulic cylinders 18 lift two L-shaped booms 17 through output rods. The two L-shaped booms 17 then lift two invert arch formwork 13 through two steel wire ropes 19. At this time, invert arch steel reinforcement mesh is laid under the two invert arch formwork 13, and then the two invert arch formwork 13 are lowered. Subsequently, concrete is poured evenly under the invert arch formwork 13 through multiple pouring ports 14. At the same time, concrete is also poured into the two invert arch side formwork 8 from both sides. Under the constraint of the invert arch formwork 13, an invert arch reinforced concrete slab is formed. After the invert arch reinforced concrete slab solidifies, the two invert arch formwork 13 are lifted again by the lifting devices, and a filling layer is poured on top of the invert arch reinforced concrete slab. After the filling layer solidifies, the entire reinforcement auxiliary device is moved by the excavation device or material transport vehicle, so that the entire reinforcement auxiliary device can be moved directly to the next section without disassembly, thus making the invert arch reinforcement work simpler and more convenient.

[0055] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A reinforcement method for enhancing the stability of the invert arch structure of a soft rock tunnel under high ground stress, characterized in that, Includes the following steps: S1: Excavation of the invert arch and cleaning of the foundation inside the tunnel; S2: The invert arch end mold, filling end mold, invert arch side mold, invert arch belly mold, and lifting mechanism are assembled in sequence. S3: Connect the assembled reinforcement auxiliary device to the excavation equipment or material transport vehicle inside the tunnel; S4: Reinforce the invert arch inside the tunnel using reinforcement auxiliary devices; S5: After the arch reinforcement work in the current area is completed, the location of the reinforcement auxiliary device will be moved by the excavation equipment or material transport vehicle; The reinforcement auxiliary device includes an inverted arch end mold, on which two connecting rings are fixedly installed. A filling end mold is installed on the inverted arch end mold. Two inverted arch side molds are installed on the inverted arch end mold. An inverted arch belly mold is rotatably installed on each of the two inverted arch side molds. Multiple pouring ports are opened on the inverted arch belly mold. Two lifting mechanisms are installed on the filling end mold. The lifting mechanism includes a vertical rod installed on the filling end mold. An L-shaped boom is hinged to the top of the vertical rod. A hydraulic cylinder is hinged to the vertical rod. The output rod of the hydraulic cylinder is hinged to the L-shaped boom. A steel wire rope is fixedly connected to the L-shaped boom. The bottom end of the steel wire rope is connected to the inverted arch belly mold. The inverted arch end mold consists of two parts, left and right. Two clip frames are fixedly installed on one side of the inverted arch end mold, and the same clip is slidably inserted into the two clip frames. The bottom of the arch end mold is provided with a first slot, and the bottom of the filling end mold extends into the first slot and is slidably connected to the first slot. The filling end mold consists of two parts, left and right, and the two parts of the filling end mold are connected at one end respectively with a convex and concave engagement structure; The two sides of the inverted arch end mold are provided with a second slot, and one end of the two inverted arch side molds extends into the corresponding second slot and is slidably connected to the second slot. Two insert frames are fixedly installed on the corresponding invert end mold, and two insert blocks are fixedly installed on the two invert side molds. The two insert blocks pass through the corresponding insert frames and are slidably connected to the corresponding insert frames. Four screws distributed in a rectangular pattern are threaded on the insert frames and insert blocks. Two shaft brackets are fixedly installed on the side formwork of the inverted arch, and a connecting arm is rotatably installed on each of the two shaft brackets. The bottom ends of the two connecting arms are fixedly connected to the belly formwork of the inverted arch. Two inserts are fixedly installed on one side of the filling end mold, and the bottom ends of the two vertical rods extend into the corresponding inserts and are slidably connected to the corresponding inserts.

2. The reinforcement method for enhancing the stability of the invert arch structure of a soft rock tunnel under high ground stress as described in claim 1, characterized in that, A hook is fixedly installed at the bottom end of the steel wire rope, and a lifting ring is fixedly installed on the inverted arch formwork. The hook is connected to the lifting ring.

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