Tunnel structure fracture section reinforcing and processing method

Abstract

The invention relates to the technical field of tunnel construction, in particular to a tunnel structure fracture section reinforcing and processing method. The method comprises the following steps: firstly, cleaning the crack surface of a fracture section, cutting, blocking and reinforcing the crack of the fracture section, determining the range of a settlement area on site, reinforcing an inverted arch layer of the settlement area by adopting a screw grouting mode, and then cleaning a construction joint of the settlement area. And grouting reinforcement and waterproof treatment are conducted on the annular construction joints of the subsidence area, in this way, effective reinforcement and repair of the fracture section of the tunnel structure are achieved, the overall strength and durability of the tunnel structure can be remarkably improved, and tunnel operation safety is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a method for reinforcing and processing a fractured section of a tunnel structure. Background Art

[0002] At present, with the rapid development of global transportation infrastructure construction, the number of highway tunnels, as important transportation facilities, has increased significantly, playing a vital role in alleviating traffic pressure and improving traffic efficiency.

[0003] However, due to a landslide at the tunnel entrance, the tunnel surrounding rock structure was squeezed, causing the tunnel structure to sink and deform. Structural cracks and non-structural cracks, as well as tearing of the internal waterstop strips of the circumferential construction joints, posed serious safety hazards to the tunnel structure. This caused the original structural waterproofing layer to fail. During periods of heavy rainfall, water leakage would occur in the circumferential construction joints, seriously threatening the operational safety and traffic capacity of the tunnel. Summary of the invention

[0004] The purpose of the present invention is to provide a method for reinforcing and treating the fractured section of a tunnel structure, aiming to solve the problem that due to landslides in the tunnel entrance section, structural cracks, non-structural cracks, and tearing of the internal waterstop strips of the annular construction joints will cause serious safety hazards to the tunnel structure, seriously threatening the operational safety and traffic capacity of the tunnel.

[0005] To achieve the above-mentioned purpose, the present invention adopts a method for reinforcing and treating a fractured section of a tunnel structure, comprising the following steps:

[0006] Clean the crack surface of the fracture section, cut and seal the cracks of the fracture section, and reinforce them by planting steel bars;

[0007] After determining the scope of the settlement area on site, the invert layer in the settlement area is reinforced by screw grouting;

[0008] After cleaning the construction joints in the settlement area, grouting reinforcement and waterproofing treatment are carried out in the circumferential construction joints in the settlement area.

[0009] Among them, in the step of cleaning the crack surface of the fracture section and cutting and sealing the crack of the fracture section:

[0010] According to the crack record sheet of the on-site investigation, the crack surface of the fractured section was cleaned with a wire brush, and a detailed inspection was conducted. The crack direction was analyzed and the crack was extended 50 cm before and after.

[0011] Use a cutting machine to cut a V-shaped groove along the seam with a width of 20mm and a depth of 20mm. After cleaning, use polymer waterproof repair mortar to seal it;

[0012] Use a 14mm drill bit to alternately drill holes along both sides of the crack, with a spacing of 30 to 40cm. Drill shallow holes first, and make the holes 1 / 3 to 1 / 2 of the structure deep. Clean the dust in the holes, implant 10mm steel bars, install the grouting nozzle, and inject KT-CSS-18 wet-type joint-filling modified epoxy resin structural adhesive.

[0013] Wait for the shallow hole material to solidify initially, continue to alternately drill holes along both sides of the crack, staggered with the first sequence of holes, and finally control the hole spacing to about 15 to 20 cm, with the hole depth reaching 1 / 2 to 2 / 3 of the structure. Clean the dust in the hole, implant the steel bar, install the grouting nozzle, and replenish the KT-CSS-18 moist type grouting modified epoxy resin structural adhesive.

[0014] Among them, in the step of cleaning the crack surface of the fracture section and cutting and sealing the crack of the fracture section:

[0015] Use a 32mm drill bit to drill holes obliquely along the left and right sides of the crack, with a spacing of 30cm. Install 22m of threaded steel bars in the holes, and use the extrusion method to pour epoxy anchoring glue to rotate the threaded steel bars into the holes.

[0016] Remove the polymer waterproof repair mortar temporarily filled in the V-shaped groove, clean the base surface, embed KT-CSS-4A high elasticity wet epoxy resin mortar, and restore the base surface color to be similar to the surface concrete color;

[0017] Carbon fiber cloth is pasted along the crack of the fracture section extending 50 cm above and below, and the overlap width is controlled at 15 to 20 cm during the pasting process.

[0018] Among them, in the step of determining the scope of the settlement area on site and reinforcing the inverted arch layer in the settlement area by screw grouting:

[0019] According to the checklist, determine the area where the subsidence will occur on site and mark it with white paint;

[0020] Use a 50mm diameter drill to drill vertically downward along the bottom plate. The hole depth should be about 2m deep into the surrounding rock layer after penetrating the bottom plate layer, leveling layer, and invert structure layer. The hole spacing should be controlled in a plum blossom arrangement of 1.5 to 2m.

[0021] Install the expansion shell hollow anchor. Before installing the anchor, use a 100mm diameter drill to expand the hole in the same position along the upper end of the 50mm anchor hole. The expansion depth is controlled at 15-20cm. Drill holes at a 45-degree angle downward along the inner corner above the ditch, with a spacing of about 2m.

[0022] Install expansion shell hollow grouting anchor rods to anchor the main structure of the tunnel to the surrounding rock, and number them. Drill and grout the odd-numbered holes first as the first-order grouting. After the first-order grouting is completed, the even-numbered holes will be drilled and grouted again 24 hours later as the second-order grouting.

[0023] Record the grouting pressure and grouting conditions during the second grouting. If the effect is not good, drill additional holes appropriately, drill through the invert structure, and inject epoxy structural adhesive.

[0024] Before grouting, use clean water to fill the observation hole, determine the degree of looseness and estimate the grouting volume based on the water volume, determine the mix ratio of the grouting material based on the situation, and install special grouting nozzles and gate valves.

[0025] Among them, in the step of determining the scope of the settlement area on site and reinforcing the inverted arch layer in the settlement area by screw grouting:

[0026] Use a screw grouting machine to grout the grouting nozzle, wait for 24 hours, and then drill and inspect the grouting area and add grouting;

[0027] All grouting nozzles were removed, and all grouting holes were sealed with waterproof high-strength epoxy mortar at a depth of 10 cm;

[0028] Backfill grouting is carried out under the invert arch at the location of the invert arch construction joint.

[0029] Among them, after cleaning the construction joints in the settlement area, in the step of grouting reinforcement and waterproofing the circumferential construction joints in the settlement area:

[0030] According to the on-site defect investigation, the construction joints in the settlement area are cleaned with an electric pick along the seam, with the depth controlled at 8-10 cm. V-shaped grooves are cut on both sides of the construction joints, with the depth of the V-shaped grooves controlled at about 5 cm. Polymer waterproof repair mortar is used to temporarily seal along the V-shaped grooves;

[0031] Divide the construction joint into multiple sections with an interval of 2 to 3 meters. Drill a hole vertically in the middle of the construction joint with a hole diameter of 25mm to 30mm. Drill through the buried waterstop until the back waterstop is not penetrated. Place a 20-diameter butyl elastic rubber nylon rod in the hole.

[0032] Holes are arranged obliquely on both sides of the construction joint. Shallow holes are arranged first, with a hole diameter of 14mm and a hole spacing of 30 to 50cm. The hole depth is controlled at about 1 / 3 to 1 / 2 of the structure depth. The grouting nozzle is installed and silane-modified polyether water-curing grouting glue - liquid rubber is poured.

[0033] Among them, after cleaning the construction joints in the settlement area, in the step of grouting reinforcement and waterproofing the circumferential construction joints in the settlement area:

[0034] After the shallow hole material is solidified, continue to drill deep holes, and control the hole depth to about 1 / 2 to 2 / 3 of the structure depth. Punch through the buried waterstop but not the back waterstop, install the grouting nozzle, and continue to inject the silane-modified polyether water-curing grouting glue-liquid rubber;

[0035] After waiting for solidification, knock out the exposed needles, use an electric pick to chisel off the polymer waterproof repair mortar material temporarily sealed on the deformation joint, clean the inside and both sides of the deformation joint, use an electric pick and a cutting machine to expand the groove along the outside of the construction joint, control the left and right widths to about 5cm each, and the depth of 2 to 3cm for the subsequent internal installation of W steel belts, and apply modified epoxy glue inside the construction joint;

[0036] Use a hair dryer to heat the temperature inside the groove, fill it with flexible sealant, and use a stick to compact the sealant and the inner surface of the groove;

[0037] Apply special epoxy interface agent on the inner side of the groove, prepare elastic sealant, and use a scraper to apply it until it is about 2 cm away from the structure surface. Install W-steel belt on the outside of the construction joint, and seal the outer side of the W-steel belt with highly elastic moist epoxy resin mortar.

[0038] The present invention provides a method for reinforcing and treating a fractured section of a tunnel structure. The method comprises the following steps: firstly, cleaning the crack surface of the fractured section, cutting and sealing the cracks of the fractured section, and reinforcing the fractured section with reinforcing bars; after determining the scope of the settlement area on site, reinforcing the inverted arch layer in the settlement area by means of screw grouting; and then, cleaning the construction joints in the settlement area, reinforcing the annular construction joints in the settlement area by grouting and waterproofing. Through the above method, the fractured section of the tunnel structure is effectively reinforced and repaired, and the overall strength and durability of the tunnel structure can be significantly improved, thereby ensuring the safety of tunnel operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a flow chart of the steps of the method for reinforcing and treating the fractured section of a tunnel structure of the present invention.

[0041] Figure 2 It is a flow chart of the steps of the method for reinforcing and treating the fractured section of a tunnel structure of the present invention.

[0042] Figure 3 It is a flow chart of the steps of the method for reinforcing and treating the fractured section of a tunnel structure of the present invention.

[0043] Figure 4 It is a flow chart of the steps of the method for reinforcing and treating the fractured section of a tunnel structure of the present invention.

[0044] Figure 5 This is a distribution diagram of the holes for drilling and planting reinforcement bars in the fractured section of the present invention.

[0045] Figure 6 It is a schematic diagram of the installation of the tunnel bottom anchor rod of the present invention.

[0046] Figure 7 It is a schematic diagram of the tunnel deformation joint segment division of the present invention.

[0047] Figure 8 It is a schematic diagram of the tunnel deformation joint after repair according to the present invention.

[0048] 100-secondary lining surface, 101-deformation joint, 102-elastic rubber nylon rod, 103-silane modified polyether water-curing grouting adhesive-liquid rubber, 104-waterstop, 105-high elastic moisture-type epoxy resin mortar, 106-W steel belt, 107-drilling, 108-anchor rod. DETAILED DESCRIPTION

[0049] See also Figures 1 to 8 The present invention provides a method for reinforcing and treating a fractured section of a tunnel structure, comprising the following steps:

[0050] S1: Clean the crack surface of the fracture section, cut and seal the cracks of the fracture section, and strengthen the diameter;

[0051] S2: After determining the scope of the settlement area on site, the invert layer in the settlement area is reinforced by screw grouting;

[0052] S3: After cleaning the construction joints in the settlement area, grouting reinforcement and waterproofing are performed in the circumferential construction joints in the settlement area.

[0053] In this embodiment, the crack surface of the fractured section is first cleaned, the cracks in the fractured section are cut and sealed, and reinforced by planting steel bars. After determining the scope of the settlement area on site, the arch layer in the settlement area is reinforced by screw grouting. After cleaning the construction joints in the settlement area, grouting reinforcement and waterproofing are performed in the circumferential construction joints in the settlement area. Through the above methods, the fractured section of the tunnel structure is effectively reinforced and repaired, which can significantly improve the overall strength and durability of the tunnel structure and ensure the safety of tunnel operation.

[0054] Furthermore, in the step of cleaning the crack surface of the fracture section and cutting and sealing the crack of the fracture section:

[0055] S11: According to the crack record sheet of the on-site investigation, the crack surface of the fractured section is cleaned with a wire brush, and a detailed inspection is carried out. The crack direction is analyzed and the crack is extended 50cm before and after.

[0056] S12: Use a cutting machine to cut a V-shaped groove along the seam with a width of 20mm and a depth of 20mm. After cleaning, use polymer waterproof repair mortar to seal it;

[0057] S13: Use a 14mm drill bit to alternately drill holes along both sides of the crack, with a spacing of 30 to 40cm. Drill shallow holes first, and make the holes 1 / 3 to 1 / 2 of the structure deep. Clean the dust in the holes, implant 10mm steel bars, install the grouting nozzle, and inject KT-CSS-18 wet-type joint-filling modified epoxy resin structural adhesive;

[0058] S14: Wait for the shallow hole material to solidify initially, continue to alternately drill holes along both sides of the crack, staggered with the first sequence of holes, and finally control the hole spacing to about 15-20cm, and the hole depth to 1 / 2-2 / 3 of the structure. Clean the dust in the hole, implant the steel bar, install the grouting nozzle, and replenish the KT-CSS-18 wet type grouting modified epoxy resin structural adhesive;

[0059] S15: Use a 32mm drill bit to drill holes obliquely along the left and right sides of the crack with a spacing of 30cm. Install 22m of threaded steel bars in the holes and use the extrusion method to pour epoxy anchoring glue to rotate and squeeze the threaded steel bars into the holes.

[0060] S16: Remove the polymer waterproof repair mortar temporarily filled in the V-shaped groove, clean the base surface, embed KT-CSS-4A high elastic moisture-type epoxy resin mortar, and restore the base surface color to be similar to the surface concrete color;

[0061] S17: Carbon fiber cloth is pasted along the crack of the fracture section extending 50 cm above and below. The overlap width is controlled at 15 to 20 cm during the pasting process.

[0062] In this embodiment, first, according to the crack record sheet of the on-site investigation, the crack surface of the fractured section is cleaned with a wire brush, and a detailed inspection is carried out to analyze the crack direction. The crack is extended 50 cm before and after, and then a cutting machine is used to cut a V-shaped groove along the crack with a width of 20 mm and a depth of 20 mm. After cleaning, a polymer waterproof repair mortar is used to seal it, and then a 14 mm drill bit is used to alternately arrange holes along both sides of the crack with a spacing of 30 to 40 cm. Shallow holes are first drilled, and the hole depth is 1 / 3 to 1 / 2 of the structure. Dust in the hole is removed, 10 mm steel bars are implanted, a grouting nozzle is installed, and KT-CSS-18 moist type grouting modified epoxy resin structural adhesive is poured. After the shallow hole material is initially solidified, alternate holes are continued along both sides of the crack, staggered with the first sequence holes, and the final hole spacing is controlled at about 15 to 20 cm, and the hole depth is 1 / 2 to 2 / 3 of the structure. , clean the dust in the hole, implant the steel bar, install the grouting nozzle, and replenish the KT-CSS-18 moist type grouting modified epoxy resin structural adhesive. Then use a 32mm drill bit to make holes obliquely along the left and right sides of the crack with a spacing of 30cm. Install 22m of threaded steel bars in the hole, and use the extrusion method to inject epoxy rebar adhesive to rotate the threaded steel bars into the hole to ensure the density and fullness of the rebar adhesive in the hole, increase the overall strength of the structure, improve the shear resistance of the structure, and restore the structure to a whole. Cut off the polymer waterproof repair mortar temporarily filled in the V-groove, clean the base surface, embed KT-CSS-4A high elastic moist type epoxy resin mortar, and restore the base surface color to be similar to the surface concrete color. Finally, extend the carbon fiber cloth 50cm up and down along the crack of the fracture section. During the pasting process, the overlap width is controlled at 15-20cm to improve the overall shear resistance of the structure.

[0063] Further, in the step of determining the scope of the settlement area on site and reinforcing the inverted arch layer in the settlement area by screw grouting:

[0064] S21: According to the checklist, determine the area where the subsidence will occur on site and mark it with white paint;

[0065] S22: Use a 50mm diameter drill to drill vertically downward along the bottom plate. The hole depth should be about 2m deep into the surrounding rock layer after penetrating the bottom plate layer, leveling layer, and invert structure layer. The hole spacing should be controlled in a plum blossom arrangement of 1.5 to 2m.

[0066] S23: Install the expansion shell hollow anchor. Before installing the anchor, use a 100mm diameter drill to expand the hole in the same position along the upper end of the 50mm anchor hole. The expansion depth is controlled at 15-20cm. Drill holes at a 45-degree angle downward along the inner corner above the ditch, with a spacing of about 2m.

[0067] S24: Install expansion shell hollow grouting anchor rods to anchor the main structure of the tunnel to the surrounding rock, and number them. Drill and grout the odd-numbered holes first as the first-order grouting. After the first-order grouting is completed, the even-numbered holes will be drilled and grouted again 24 hours later as the second-order grouting.

[0068] S25: Record the grouting pressure and grouting conditions during the second grouting. If the effect is not good, drill additional holes appropriately, drill through the invert structure, and inject epoxy structural adhesive.

[0069] S26: Before grouting, use clean water to fill the observation hole, determine the degree of looseness and estimate the grouting amount based on the water volume, determine the mix ratio of grouting materials based on the situation, and install special grouting nozzles and gate valves;

[0070] S27: Use a screw grouting machine to grout the grouting nozzle, wait for 24 hours, and then drill and explore the grouting range and add grouting;

[0071] S28: Remove all grouting nozzles, and use waterproof high-strength epoxy mortar to seal all grouting holes at a depth of 10 cm;

[0072] S29: Backfill grouting is performed under the invert arch at the location of the invert arch construction joint.

[0073] In this embodiment, firstly, according to the checklist, the scope of the settlement area is determined on site, and marked with white paint, and then a 50mm-diameter drill is used to drill vertically downward along the bottom plate. The hole depth is based on penetrating the bottom plate layer, the leveling layer, and the inverted arch structure layer and then continuing to penetrate the surrounding rock layer for about 2m. The hole spacing is controlled to be arranged in a plum blossom shape of 1.5 to 2m. Then, the expansion shell hollow anchor is installed. Before installing the anchor, a 100mm-diameter drill is used to perform in-situ expansion along the upper end of the 50mm anchor hole. The expansion depth is controlled to be 15 to 20cm, and the inner corner above the ditch is drilled. Drill holes at a 45-degree angle downwards, with a spacing of about 2m, install expansion shell hollow grouting anchor rods, anchor the main structure of the tunnel to the surrounding rock, and number them. Drill and grout the odd-numbered holes first as the first sequence of grouting. After the first sequence of grouting is completed for 24 hours, drill and grout the even-numbered holes again as the second sequence of grouting. This grouting is a supplement to the first sequence of grouting, and also a check on the effect of the first grouting. It increases the bearing capacity and impermeability of the surrounding rock layer under the bottom plate structure, and at the same time plays a certain lifting role on the bottom plate. At the same time, record the second The grouting pressure and grouting conditions during grouting. For those with poor effects, appropriate additional holes are drilled to penetrate the invert structure and inject epoxy structural adhesive. Before grouting, clean water is used to inject the observation hole. The degree of non-compactness and estimated grouting volume are determined based on the amount of water. The proportion of grouting materials is determined based on the situation to ensure the quality and effect of grouting. Special grouting nozzles and gate valves are installed, and cement-based special grouting materials are stirred. The grouting nozzles are injected with a screw grouting machine. Low pressure, slow injection, rapid curing, and intermittent grouting are used in stages and sequences. The grouting pressure is normally controlled at 0.3~0.5 MPa, the instantaneous pressure cannot exceed 1.5 MPa. According to the on-site grouting situation, the slurry concentration is adjusted and switched between the water-cement ratio of 1:1 and 1:2. After waiting for 24 hours, the grouting range is drilled and supplemented with grouting, and then all grouting nozzles are removed. All grouting holes are sealed with a depth of 10 cm using waterproof high-strength epoxy mortar to ensure that no water can flow out of the grouting holes and restore the surface. Finally, the construction joint of the invert is backfilled with grouting under the invert to reduce the slight settlement under the load, which causes the appearance of reflective cracks in the secondary lining.

[0074] Further, after cleaning the construction joints in the settlement area, in the steps of grouting reinforcement and waterproofing the circumferential construction joints in the settlement area:

[0075] S31: According to the on-site defect investigation, the construction joints in the settlement area are cleaned with an electric pick along the seam, with the depth controlled at 8-10 cm. V-shaped grooves are cut on both sides of the construction joints, with the depth of the V-shaped grooves controlled at about 5 cm. Polymer waterproof repair mortar is used to temporarily seal along the V-shaped grooves;

[0076] S32: Divide the construction joint into multiple sections with an interval of 2 to 3 meters. Drill a hole vertically in the middle of the construction joint with a hole diameter of 25 mm to 30 mm. Drill through the buried waterstop until the back waterstop is not penetrated. Place a 20-diameter butyl elastic rubber nylon rod in the hole.

[0077] S33: Drill holes obliquely on both sides of the construction joint, first drill shallow holes with a hole diameter of 14 mm and a hole spacing of 30 to 50 cm. The hole depth is controlled at about 1 / 3 to 1 / 2 of the structure depth. Install the grouting nozzle and inject silane-modified polyether water-curing grouting glue-liquid rubber;

[0078] S34: After the shallow hole material is solidified, continue to drill deep holes, control the hole depth to about 1 / 2 to 2 / 3 of the structure depth, punch through the buried waterstop but not the back waterstop, install the grouting nozzle, and continue to inject silane-modified polyether water-curing grouting glue-liquid rubber;

[0079] S35: After waiting for solidification, knock out the exposed needles, use an electric pick to chisel off the polymer waterproof repair mortar material temporarily sealed on the deformation joint, clean the inside and both sides of the deformation joint, use an electric pick and a cutting machine to expand the groove along the outside of the construction joint, control the left and right widths to about 5 cm each, and the depth to 2 to 3 cm for the subsequent internal installation of the W steel belt, and apply modified epoxy glue inside the construction joint;

[0080] S36: Use a hair dryer to heat the temperature inside the groove, fill it with flexible sealant, tamp it with a stick, compact the sealant and the inner surface of the groove, apply epoxy special interface agent on the inner side of the groove, prepare elastic sealant, and apply it with a scraper until it is about 2 cm away from the structure surface, install W steel belt on the outside of the construction joint, and seal the outer side of the W steel belt with high elastic wet epoxy resin mortar;

[0081] S37: Apply special epoxy interface agent on the inner side of the groove, prepare elastic sealant, and use a scraper to apply it until it is about 2 cm away from the structure surface. Install W steel belt on the outside of the construction joint, and seal the outer side of the W steel belt with highly elastic moist epoxy resin mortar.

[0082] In this embodiment, firstly, according to the on-site defect investigation, the construction joints in the settlement area are cleaned along the joints with an electric pick, and the depth is controlled at 8 to 10 cm. V-shaped grooves are cut on both sides of the construction joints, and the depth of the V-shaped grooves is controlled at about 5 cm. Polymer waterproof repair mortar is used to temporarily seal along the V-shaped grooves to form a closed space to ensure the effect of glue injection; the construction joints are divided into multiple sections with an interval of 2 to 3 m, and a vertical hole with a hole diameter of 25 mm to 30 mm is drilled in the middle of the construction joint to penetrate the buried waterstop belt without penetrating the back waterstop belt. Place Ф20 butyl elastic rubber nylon rods in the hole to divide the section; and arrange holes obliquely on both sides of the construction joint, first arrange shallow holes with a hole diameter of 14mm and a hole spacing of 30-50cm. The hole depth is controlled at about 1 / 3-1 / 2 of the structure depth. Install the grouting nozzle and pour the silane-modified polyether water-curing grouting glue-liquid rubber. After waiting for the shallow hole material to cure, continue to make deep holes. The hole depth is controlled at about 1 / 2-2 / 3 of the structure depth. Punch through the buried waterstop but not the back waterstop. Install the grouting nozzle and continue to pour the silane-modified polyether water-curing grouting glue. -Liquid rubber, wait for solidification, knock out the exposed needle, use an electric pick to chisel out the polymer waterproof repair mortar material temporarily sealed on the deformation joint, clean the inside and both sides of the deformation joint, use an electric pick and a cutting machine to expand the groove along the outside of the construction joint, control the left and right widths to about 5cm, and the depth is 2 to 3cm for the subsequent built-in installation of W steel belts, apply modified epoxy glue to the construction joint, and then use a hair dryer to heat the temperature in the groove, fill it with flexible sealant, use a stick to compact it, and apply epoxy special interface agent on the inside of the groove, prepare elastic The elastic sealant is applied with a scraper until it is about 2 cm away from the structure surface. A W steel belt is installed on the outside of the construction joint, and the outer side of the W steel belt is sealed with a highly elastic moisture-type epoxy resin mortar. Finally, a special epoxy interface agent is applied on the inside of the groove, and an elastic sealant is prepared. It is applied with a scraper until it is about 2 cm away from the structure surface to leave space for the subsequent built-in installation of the W steel belt. A W steel belt is installed on the outside of the construction joint, and the outer side of the W steel belt is sealed with a highly elastic moisture-type epoxy resin mortar, parallel to the base surface, to form a third waterproof system.

[0083] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for strengthening and treating a fractured section of a tunnel structure, It is characterized in that The steps include: Clean the crack surface of the fracture section, cut and seal the cracks of the fracture section, and reinforce them by planting steel bars; After determining the scope of the settlement area on site, the invert layer in the settlement area is reinforced by screw grouting; After cleaning the construction joints in the settlement area, grouting reinforcement and waterproofing treatment are carried out in the circumferential construction joints in the settlement area.

2. The method for reinforcing and treating a fractured section of a tunnel structure according to claim 1, It is characterized in that In the steps of cleaning the crack surface of the fracture section and cutting and sealing the cracks of the fracture section: According to the crack record sheet of the on-site investigation, the crack surface of the fractured section was cleaned with a wire brush, and a detailed inspection was conducted. The crack direction was analyzed and the crack was extended 50 cm before and after. Use a cutting machine to cut a V-shaped groove along the seam with a width of 20mm and a depth of 20mm. After cleaning, use polymer waterproof repair mortar to seal it; Use a 14mm drill bit to alternately drill holes along both sides of the crack, with a spacing of 30 to 40cm. Drill shallow holes first, and make the holes 1 / 3 to 1 / 2 of the structure deep. Clean the dust in the holes, implant 10mm steel bars, install the grouting nozzle, and inject KT-CSS-18 wet-type joint-filling modified epoxy resin structural adhesive. Wait for the shallow hole material to solidify initially, continue to alternately drill holes along both sides of the crack, staggered with the first sequence of holes, and finally control the hole spacing to about 15 to 20 cm, with the hole depth reaching 1 / 2 to 2 / 3 of the structure. Clean the dust in the hole, implant the steel bar, install the grouting nozzle, and replenish the KT-CSS-18 moist type grouting modified epoxy resin structural adhesive.

3. The method for reinforcing and treating the fractured section of a tunnel structure as claimed in claim 2, It is characterized in that In the steps of cleaning the crack surface of the fracture section and cutting and sealing the cracks of the fracture section: Use a 32mm drill bit to drill holes obliquely along the left and right sides of the crack, with a spacing of 30cm. Install 22m of threaded steel bars in the holes, and use the extrusion method to pour epoxy anchoring glue to rotate the threaded steel bars into the holes. Remove the polymer waterproof repair mortar temporarily filled in the V-shaped groove, clean the base surface, embed KT-CSS-4A high elasticity wet epoxy resin mortar, and restore the base surface color to be similar to the surface concrete color; Carbon fiber cloth is pasted along the crack of the fracture section extending 50 cm above and below, and the overlap width is controlled at 15 to 20 cm during the pasting process.

4. The method for reinforcing and treating a fractured section of a tunnel structure as claimed in claim 1, It is characterized in that After determining the scope of the settlement area on site, the steps of reinforcing the invert layer in the settlement area by screw grouting are as follows: According to the checklist, determine the area where the subsidence will occur on site and mark it with white paint; Use a 50mm diameter drill to drill vertically downward along the bottom plate. The hole depth should be about 2m deep into the surrounding rock layer after penetrating the bottom plate layer, leveling layer, and invert structure layer. The hole spacing should be controlled in a plum blossom arrangement of 1.5 to 2m. Install the expansion shell hollow anchor. Before installing the anchor, use a 100mm diameter drill to expand the hole in the same position along the upper end of the 50mm anchor hole. The expansion depth is controlled at 15-20cm. Drill holes at a 45-degree angle downward along the inner corner above the ditch, with a spacing of about 2m. Install expansion shell hollow grouting anchor rods to anchor the main structure of the tunnel to the surrounding rock, and number them. Drill and grout the odd-numbered holes first as the first-order grouting. After the first-order grouting is completed, the even-numbered holes will be drilled and grouted again 24 hours later as the second-order grouting. Record the grouting pressure and grouting conditions during the second grouting. If the effect is not good, drill additional holes appropriately, drill through the invert structure, and inject epoxy structural adhesive. Before grouting, use clean water to fill the observation hole, determine the degree of looseness and estimate the grouting volume based on the water volume, determine the mix ratio of the grouting material based on the situation, and install special grouting nozzles and gate valves.

5. The method for reinforcing and treating a fractured section of a tunnel structure as claimed in claim 4, It is characterized in that After determining the scope of the settlement area on site, the steps of reinforcing the invert layer in the settlement area by screw grouting are as follows: Use a screw grouting machine to grout the grouting nozzle, wait for 24 hours, and then drill and inspect the grouting area and add grouting; All grouting nozzles were removed, and all grouting holes were sealed with waterproof high-strength epoxy mortar at a depth of 10 cm; Backfill grouting is carried out under the invert arch at the location of the invert arch construction joint.

6. The method for reinforcing and treating a fractured section of a tunnel structure according to claim 1, It is characterized in that After cleaning the construction joints in the settlement area, the steps of grouting reinforcement and waterproofing the circumferential construction joints in the settlement area are as follows: According to the on-site defect investigation, the construction joints in the settlement area are cleaned with an electric pick along the seam, with the depth controlled at 8-10 cm. V-shaped grooves are cut on both sides of the construction joints, with the depth of the V-shaped grooves controlled at about 5 cm. Polymer waterproof repair mortar is used to temporarily seal along the V-shaped grooves; Divide the construction joint into multiple sections with an interval of 2 to 3 meters. Drill a hole vertically in the middle of the construction joint with a hole diameter of 25mm to 30mm. Drill through the buried waterstop until the back waterstop is not penetrated. Place a 20-diameter butyl elastic rubber nylon rod in the hole. Holes are arranged obliquely on both sides of the construction joint. Shallow holes are arranged first, with a hole diameter of 14mm and a hole spacing of 30 to 50cm. The hole depth is controlled at about 1 / 3 to 1 / 2 of the structure depth. The grouting nozzle is installed and silane-modified polyether water-curing grouting glue - liquid rubber is poured.

7. The method for reinforcing and treating a fractured section of a tunnel structure according to claim 6, It is characterized in that After cleaning the construction joints in the settlement area, the steps of grouting reinforcement and waterproofing the circumferential construction joints in the settlement area are as follows: After the shallow hole material is solidified, continue to drill deep holes, and control the hole depth to about 1 / 2 to 2 / 3 of the structure depth. Punch through the buried waterstop but not the back waterstop, install the grouting nozzle, and continue to inject the silane-modified polyether water-curing grouting glue-liquid rubber; After waiting for solidification, knock out the exposed needles, use an electric pick to chisel off the polymer waterproof repair mortar material temporarily sealed on the deformation joint, clean the inside and both sides of the deformation joint, use an electric pick and a cutting machine to expand the groove along the outside of the construction joint, control the left and right widths to about 5cm each, and the depth of 2 to 3cm for the subsequent internal installation of W steel belts, and apply modified epoxy glue inside the construction joint; Use a hair dryer to heat the temperature inside the groove, fill it with flexible sealant, and use a stick to compact the sealant and the inner surface of the groove; Apply special epoxy interface agent on the inner side of the groove, prepare elastic sealant, and use a scraper to apply it until it is about 2 cm away from the structure surface. Install W-steel belt on the outside of the construction joint, and seal the outer side of the W-steel belt with highly elastic moist epoxy resin mortar.

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