Shield tunneling and reinforcing construction method for double-deck highway tunnel

Abstract

The application discloses a kind of double-layer highway tunnel's shield tunneling reinforcement construction method, comprising the following steps: step 1: early calibration probe preparation;Step 2: the surrounding of drilling area is reinforced;Step 3: reinforcing rod is probed into reinforced hole;Step 4: shield slotting;Step 5: the side of slot hole set up in step 4 is reinforced;Step 6: the surface of anti-net is reinforced waterproof treatment.The application can reinforce the shield slotting area, to ensure the safety of construction personnel in tunnel construction.

Description

TECHNICAL FIELD

[0001] The application relates to a tunnel shield construction method, in particular to a shield tunneling and reinforcing construction method for a double-layer highway tunnel. BACKGROUND

[0002] The shield machine is a tunnel boring machine using the shield method, and the shield construction method is widely applied to highway tunnel construction.

[0003] A Chinese invention patent with the publication number CN114060043A discloses a construction method for a soil pressure balance shield passing through a composite stratum, which comprises the following steps: S01, preliminary preparation: the specific position of the water storage structure is ascertained, and the relative position relationship between the water storage structure and the shield tunnel is determined; S02, underground drilling: after the relative position between the water storage structure and the shield tunnel is determined, the distribution position of the blasting hole is first determined outside the safe distance from the edge of the water storage structure, and then the ground is drilled; S03, deep hole blasting: after the drilling is completed, deep hole blasting is performed, and after the blasting is completed, the blasting hole is sealed with cement mortar; S04, ground reinforcement: after the blasting is completed, the ground is grouted and reinforced; and S05, shield tunneling: the shield machine passes through the water storage structure under the control of appropriate shield parameters.

[0004] In the construction method, no corresponding reinforcing mechanism is arranged in the surrounding area. When the shield construction is performed on the highway tunnel, the corresponding shield equipment is used to perform shield slotting treatment on the highway tunnel. In the actual slotting process, if no corresponding reinforcing mechanism is arranged in the surrounding area, part of the sandstone or other soil will fall during the construction of the corresponding construction personnel in the tunnel, and in severe cases, the construction personnel will be injured.

[0005] Therefore, it is necessary to provide a shield tunneling and reinforcing construction method for a double-layer highway tunnel to solve the above technical problems SUMMARY

[0006] The application aims to provide a shield tunneling and reinforcing construction method for a double-layer highway tunnel, which can reinforce the shield slotting area to ensure the safety of the construction personnel in the tunnel.

[0007] The application is implemented as follows:

[0008] A shield tunneling and reinforcing construction method for a double-layer highway tunnel comprises the following steps:

[0009] Step 1: preliminary calibration and preparation: in the determined drilling area range, the humidity and hardness of the soil are determined in advance, and a detection device is used to check whether there is a water source in the shield construction area. If there is a water source in the shield construction area, an external extraction device is used to extract the water source and air dry it;

[0010] Step 2: reinforcing treatment is performed on the periphery of the drilling area: a plurality of reinforcing holes are arranged at intervals on the inner wall of the reinforcing hole, and reinforcing agent is applied to the reinforcing hole;

[0011] Step 3: inserting a reinforcing rod into the reinforcing hole: a waterproof coating is applied to the outer surface of the reinforcing rod, the reinforcing rod is embedded into the corresponding reinforcing hole, and the reinforcing rod is installed in the reinforcing hole through the connecting piece;

[0012] Step 4: shield grooving: determine the shield grooving area, use shield equipment to drill the grooving area, according to the pre-set shield route, if water source is generated during the shield grooving process, drill the water source through the drilling equipment, and then place it after the water source is pumped out through the external pumping equipment;

[0013] Step 5: reinforcing treatment is performed on the side surface of the groove hole opened in step 4: a plurality of side groove holes are arranged on the inner wall of the groove hole, and a fall prevention net is laid on the inner wall of the groove hole;

[0014] Step 6: reinforcing and waterproof treatment is performed on the surface of the fall prevention net: after uniformly applying reinforcing agent to the surface of the fall prevention net, standing for a while, then applying waterproof agent and standing for a while.

[0015] In step 1, the standing time of the shield construction area is 30-50 min, and the speed of the pumping equipment for pumping water source is 1.5-2 cubic meters / hour.

[0016] In step 2, the diameter of the reinforcing hole is 5-10 cm, and the thickness of the reinforcing agent is 1-2 cm.

[0017] In step 3, the thickness of the waterproof coating is 0.5-0.8 cm.

[0018] In step 4, the drilling rate of the drilling equipment is 150-250 r / min, and the standing time after the water source is pumped out is 40-50 min.

[0019] In step 5, the diameter of the side groove hole is 1-4 cm, and the mesh diameter of the fall prevention net is 2-4 cm.

[0020] In step 6, the standing time of the reinforcing agent after being applied is 5-10 min, the thickness of the waterproof agent after being applied is 1.3-1.8 cm, and the standing time of the waterproof agent after being applied is 3-7 min.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1. This invention strengthens the entire drilling area by using reinforcing rods around the drilling area, thereby improving the safety of the tunnel boring machine slot and preventing workers from being injured by falling sand or soil during tunnel construction, thus eliminating potential safety hazards.

[0023] 2. This invention, by employing an anti-fall net and reinforcing and waterproofing it, effectively improves the safety of the shield tunnel slot, prevents the falling of sand and gravel inside the tunnel, and effectively ensures the safety of construction personnel inside the tunnel. Attached Figure Description

[0024] Figure 1 This is a flowchart of the shield tunneling reinforcement construction method for a double-layer highway tunnel according to the present invention. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] Please see the appendix Figure 1 A shield tunneling reinforcement construction method for a double-layer highway tunnel includes the following steps:

[0027] Step 1: Preliminary calibration and preparation of the detection system. Specifically, within the determined drilling area, the moisture and hardness of the soil are determined in advance, and the corresponding detection equipment is used to check whether there is a water source in the shield tunneling area. If there is a water source in the shield tunneling area, the water source is extracted using external extraction equipment, and the shield tunneling area is left to dry for a period of time.

[0028] Preferably, the detection equipment can be a nuclear magnetic resonance groundwater detector using existing technology, and the extraction equipment can be a groundwater depth sampler using existing technology, used to detect and extract water sources, so as to avoid the adverse effects of groundwater on shield tunneling construction.

[0029] Preferably, the drying time in the shield tunneling area is 30-50 minutes, and the water extraction speed is 1.5-2 cubic meters per hour. Attention should be paid to the extraction speed to avoid accidents such as soil collapse caused by rapid water extraction. After extraction, the water should be left to stand for a period of time to ensure that no groundwater continues to seep into the borehole area.

[0030] Step 2: Reinforce the area around the drilling area. Specifically, make several reinforcement holes at intervals around the drilling area with corresponding depths. During the drilling process, apply the corresponding reinforcement agent to the hole walls of the reinforcement holes.

[0031] The reinforcement holes can be drilled using conventional drilling procedures, which will not be elaborated here. The diameter of the reinforcement holes should be limited to a certain range to ensure that the soil in the drilling area is not disturbed. Preferably, the diameter of the reinforcement holes is 5-10 cm, the thickness of the reinforcement agent is 1-2 cm, and the reinforcement agent can be a structural adhesive using existing technology to ensure the structural strength of the reinforcement holes.

[0032] Step 3: Insert the reinforcing rod into the reinforcing hole. Specifically, apply a waterproof coating to the outer surface of the corresponding reinforcing rod beforehand, embed the reinforcing rod into the corresponding reinforcing hole, and install the reinforcing rod into the reinforcing hole using the connector.

[0033] The waterproof coating can be made of acrylic waterproof coatings with existing technology. The coating thickness is controlled within a specified range. Preferably, the coating thickness is 0.5-0.8 cm.

[0034] By inserting reinforcing rods into the reinforcement holes, a reinforced structure is formed around the borehole area, which helps to improve the structural strength of the surrounding area and prevent sand, gravel, and soil debris from falling out of the tunnel. The length, specifications, and other parameters of the reinforcing rods can be adapted to the actual geological conditions and reinforcement requirements.

[0035] Step 4: Shield tunneling. Specifically, determine the shield tunneling area, use the corresponding shield tunneling equipment to drill holes in the tunneling area, and follow the pre-set shield tunneling route. If water is generated during the shield tunneling process, drill holes at the water source using drilling equipment, and use external extraction equipment to pump out the water through the holes. After the water source is pumped out, let it stand for a period of time.

[0036] Preferably, the tunnel boring machine (TBM) can be drilled using conventional drilling procedures, which will not be elaborated here. The drilling rate of the drilling equipment is 150-250 r / min, and the settling time after the water source is drained is 40-50 min.

[0037] The drilling rate of the drilling equipment should be strictly controlled to avoid the impact of drilling on the tunnel boring machine (TBM) trenching. At the same time, it should be ensured that the water source can be effectively extracted. After the water source is extracted, it should be left to stand for a period of time to ensure that no more water is generated before continuing the TBM trenching construction.

[0038] Step 5: Reinforce the sides of the slots opened in Step 4. Specifically, make several side slots at intervals on the inner wall of the slots. After the side slots are made, lay anti-fall netting on the inner wall of the slots through the side slots using connectors to further improve the structural strength of the slot and prevent sand or soil from falling.

[0039] The diameter of the side slot holes should be limited to a certain range to avoid disturbing the soil on the sidewalls of the slots. The opening of the side slot holes can be done using conventional methods, which will not be elaborated here. Preferably, the diameter of the side slot holes is 1-4 cm; the depth of the side slot holes can be adjusted according to the actual needs of installing the anti-fall net. The mesh diameter of the anti-fall net is limited to a certain range to ensure the blocking and interception of sand, gravel, and loose soil, effectively preventing sand, gravel, and loose soil from falling into the tunnel and injuring people. Preferably, the mesh diameter of the anti-fall net is 2-4 cm.

[0040] Step 6: Reinforce and waterproof the surface of the safety net. Specifically, apply a uniform thickness of reinforcing agent to the surface of the safety net. After the reinforcing agent is applied, let it stand for a period of time. After standing, apply a waterproof agent of a certain thickness and let it stand for a period of time again.

[0041] By reinforcing and waterproofing the anti-fall netting, the structural strength and waterproofing performance of the grooved area are further guaranteed, effectively preventing sand or soil from falling in.

[0042] Preferably, the reinforcing agent can be a structural adhesive using existing technology, and the settling time after applying the reinforcing agent is 5-10 minutes. The waterproofing agent can be a mortar waterproofing agent using existing technology, and the thickness of the waterproofing agent is 1.3-1.8 cm, and the settling time after applying the waterproofing agent is 3-7 minutes.

[0043] Example 1:

[0044] Please see the appendix Figure 1 A shield tunneling reinforcement construction method for a double-layer highway tunnel includes the following steps:

[0045] Step 1: Preliminary Calibration and Illumination Preparation: Within the determined drilling area, the soil moisture and hardness are determined in advance, and a nuclear magnetic resonance groundwater detector is used to check whether there is a water source in the shield tunneling area. If there is a water source in the shield tunneling area, a groundwater depth sampler is used to extract the water source at a rate of 1.5 cubic meters per hour, and the shield tunneling area is left to dry for 30 minutes.

[0046] Step 2: Reinforce the area around the drilling area. Specifically, make several reinforcement holes with a diameter of 5cm at intervals around the drilling area. During the drilling process, use structural adhesive as a reinforcement agent to apply to the hole walls of the reinforcement holes with a thickness of 1cm.

[0047] Step 3: Insert the reinforcing rod into the reinforcing hole. Specifically, apply a 0.5cm thick acrylic waterproof coating to the outer surface of the corresponding reinforcing rod as a waterproof coating, embed the reinforcing rod into the corresponding reinforcing hole, and fix the reinforcing rod in the reinforcing hole with the connector.

[0048] Step 4: Shield tunneling. Specifically, determine the shield tunneling area, use the corresponding shield tunneling equipment to drill holes in the tunneling area, and follow the pre-set shield tunneling route. If water is generated during the shield tunneling process, use drilling equipment to drill holes at a rate of 150 r / min, and use extraction equipment to pump out the water through the holes. After the water is pumped out, let it stand for 40 minutes.

[0049] Step 5: Reinforce the sides of the slots opened in Step 4. Specifically, make several side slots with a diameter of 1cm at intervals on the inner wall of the slots. After the side slots are made, lay a net with a mesh diameter of 2cm on the inner wall of the slots to prevent falling.

[0050] Step 6: Reinforce and waterproof the surface of the fall protection net. Specifically, apply a uniform thickness of structural adhesive as a reinforcing agent to the surface of the fall protection net. After the reinforcing agent is applied, let it stand for 5 minutes. After standing for 5 minutes, apply a 1.3cm thick layer of mortar waterproofing agent and let it stand for another 3 minutes.

[0051] Example 2:

[0052] Please see the appendix Figure 1 A shield tunneling reinforcement construction method for a double-layer highway tunnel includes the following steps:

[0053] Step 1: Preliminary calibration and preparation of the drilling area: Within the determined drilling area, the moisture and hardness of the soil are determined in advance, and a nuclear magnetic resonance groundwater detector is used to check whether there is a water source in the shield tunneling area. If there is a water source in the shield tunneling area, a groundwater depth sampler is used to extract the water source at a rate of 1.7 cubic meters per hour, and the shield tunneling area is left to stand for 40 minutes.

[0054] Step 2: Reinforce the area around the drilling area. Specifically, drill several reinforcement holes with a diameter of 7cm at the corresponding depth around the drilling area. During the drilling process, use structural adhesive as a reinforcement agent to apply to the hole walls of the reinforcement holes with a thickness of 1.5cm.

[0055] Step 3: Insert the reinforcing rod into the reinforcing hole. Specifically, apply a 0.65cm thick acrylic waterproof coating to the outer surface of the corresponding reinforcing rod as a waterproof coating, embed the reinforcing rod into the corresponding reinforcing hole, and fix the reinforcing rod in the reinforcing hole with the connector.

[0056] Step 4: Shield tunneling. Specifically, determine the shield tunneling area, use the corresponding shield tunneling equipment to drill holes in the tunneling area, and follow the pre-set shield tunneling route. If water is generated during the shield tunneling process, use drilling equipment to drill holes at a rate of 200 r / min, and use extraction equipment to pump out the water through the holes. After the water is pumped out, let it stand for 45 minutes.

[0057] Step 5: Reinforce the sides of the slots opened in Step 4. Specifically, make several side slots with a diameter of 2.5cm at intervals on the inner wall of the slots. After the side slots are made, lay a net with a mesh size of 3cm on the inner wall of the slots to prevent falling.

[0058] Step 6: Reinforce and waterproof the surface of the fall protection net. Specifically, apply a uniform thickness of structural adhesive as a reinforcing agent to the surface of the fall protection net. After the reinforcing agent is applied, let it stand for 7 minutes. After standing for 7 minutes, apply a 1.5cm thick layer of mortar waterproofing agent and let it stand for another 5 minutes.

[0059] Example 3:

[0060] Please see the appendix Figure 1 A shield tunneling reinforcement construction method for a double-layer highway tunnel includes the following steps:

[0061] Step 1: Preliminary Calibration and Illumination Preparation: Within the determined drilling area, the soil moisture and hardness are determined in advance, and a nuclear magnetic resonance groundwater detector is used to check whether there is a water source in the shield tunneling area. If there is a water source in the shield tunneling area, a groundwater depth sampler is used to extract the water source at a rate of 2 cubic meters per hour, and the shield tunneling area is left to stand for 50 minutes.

[0062] Step 2: Reinforce the area around the drilling area. Specifically, drill several reinforcement holes with a diameter of 10cm at the corresponding depth around the drilling area. During the drilling process, use structural adhesive as a reinforcement agent to apply to the hole walls of the reinforcement holes with a thickness of 2cm.

[0063] Step 3: Insert the reinforcing rod into the reinforcing hole. Specifically, apply a 0.8cm thick acrylic waterproof coating to the outer surface of the corresponding reinforcing rod as a waterproof coating, embed the reinforcing rod into the corresponding reinforcing hole, and fix the reinforcing rod in the reinforcing hole with the connector.

[0064] Step 4: Shield tunneling. Specifically, determine the shield tunneling area, use the corresponding shield tunneling equipment to drill holes in the tunneling area, and follow the pre-set shield tunneling route. If water is generated during the shield tunneling process, use drilling equipment to drill holes at a rate of 250 r / min, and use extraction equipment to pump out the water through the holes. After the water is pumped out, let it stand for 50 minutes.

[0065] Step 5: Reinforce the sides of the slots opened in Step 4. Specifically, make several side slots with a diameter of 4cm at intervals on the inner wall of the slots. After the side slots are made, lay a net with a mesh diameter of 4cm on the inner wall of the slots to prevent falling.

[0066] Step 6: Reinforce and waterproof the surface of the fall protection net. Specifically, apply a uniform thickness of structural adhesive as a reinforcing agent to the surface of the fall protection net. After the reinforcing agent is applied, let it stand for 10 minutes. After standing, apply a 1.8cm thick layer of mortar waterproofing agent and let it stand for another 7 minutes.

[0067] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the invention. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A shield tunneling reinforcement construction method for a double-layer highway tunnel, characterized by: Includes the following steps: Step 1: Preliminary calibration and preparation of the probe: Within the determined drilling area, the moisture and hardness of the soil are determined in advance, and the probe equipment is used to check whether there is a water source in the shield tunneling area. If there is a water source in the shield tunneling area, the water source is extracted and left to dry using external extraction equipment. Step 2: Reinforce the area around the drilling area: Drill several reinforcement holes at intervals around the drilling area and apply a reinforcing agent to the inner wall of the reinforcement holes; Step 3: Insert the reinforcing rod into the reinforcing hole: Apply a waterproof coating to the outer surface of the reinforcing rod, insert the reinforcing rod into the corresponding reinforcing hole, and install the reinforcing rod into the reinforcing hole using the connector; Step 4: Shield tunneling: Determine the shield tunneling area, use shield tunneling equipment to drill holes in the tunneling area, and follow the pre-set shield tunneling route. If water is generated during the shield tunneling process, drill holes at the water source using drilling equipment, and then use external extraction equipment to pump out the water through the holes and let it stand. Step 5: Reinforce the sides of the slots opened in Step 4: After opening several side slots at intervals on the inner wall of the slots, lay a net to prevent falling off the inner wall of the slots. Step 6: Reinforce and waterproof the surface of the fall protection net: Apply a uniform thickness of reinforcing agent to the surface of the fall protection net and let it stand, then apply a waterproof agent and let it stand.

2. The shield tunneling reinforcement construction method for double-layer highway tunnels according to claim 1, characterized in that: In step 1, the drying time in the shield tunneling area is 30-50 minutes, and the water extraction speed of the extraction equipment is 1.5-2 cubic meters / h.

3. The shield tunneling reinforcement construction method for double-layer highway tunnels according to claim 1, characterized in that: In step 2, the diameter of the reinforcing hole is 5-10cm, and the thickness of the reinforcing agent is 1-2cm.

4. The shield tunneling reinforcement construction method for double-layer highway tunnels according to claim 1, characterized in that: In step 3, the thickness of the waterproof coating is 0.5-0.8 cm.

5. The shield tunneling reinforcement construction method for double-layer highway tunnels according to claim 1, characterized in that: In step 4, the drilling rate of the drilling equipment is 150-250 r / min, and the settling time after the water source is drained is 40-50 min.

6. The shield tunneling reinforcement construction method for double-layer highway tunnels according to claim 1, characterized in that: In step 5, the diameter of the side slot holes is 1-4cm, and the diameter of the anti-fall net is 2-4cm.

7. The shield tunneling reinforcement construction method for double-layer highway tunnels according to claim 1, characterized in that: In step 6, the time for the reinforcing agent to stand after application is 5-10 minutes, the thickness of the waterproofing agent is 1.3-1.8 cm, and the time for the waterproofing agent to stand after application is 3-7 minutes.

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