Construction method for crack treatment of ship lock

Abstract

A construction method for treating cracks in a ship lock, comprising the following steps: 1) anchor spraying support construction; 2) slope retaining wall concrete construction; 3) concrete curing; 4) concrete surface roughening; 5) anchor pile and drainage hole construction. A slope-adhering concrete retaining wall is provided, a double-layer steel mesh is provided on the retaining wall, the outer side of the retaining wall panel is roughened, and dowel bars are reserved for connection with the lock wall; and the karst caves developed at the foot of the slope are treated by pouring a concrete base first, and the remaining part is treated by hanging mesh spraying. The patent of the present invention adopts the above method, which can effectively solve the problem of slope instability caused by the transverse cracks formed on the slope of the ship lock when a large amount of karst water gushes out, and ensure the safety of the slope during the construction period.

Description

Technical Field

[0001] The invention relates to the technical field of ship lock slope protection surface construction, in particular to a ship lock crack treatment construction method. Background Art

[0002] When transverse cracks appear on the slope surface of the ship lock and the transverse cracks develop in an "arc shape" along the slope surface, and when a cave develops at the foot of the slope and the bottom of the cave is unknown, there is a huge safety hazard due to a large amount of karst water gushing out of the cave. In order to ensure the safety of the slope during the construction period, the slope needs to be reinforced. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a ship lock crack treatment construction method, which can effectively solve the slope instability problem caused by the transverse cracks formed on the ship lock slope when a large amount of karst water gushes out, thereby ensuring the slope safety during the construction period.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a construction method for treating cracks in a ship lock, comprising the following steps:

[0005] 1) Anchor spraying support construction;

[0006] 2) Slope retaining wall concrete construction;

[0007] 3) Concrete curing;

[0008] 4) Roughening of concrete surface;

[0009] 5) Construction of anchor piles and drainage holes.

[0010] In a preferred embodiment, the step 1) specifically comprises the following steps:

[0011] 1.1) Construction preparation:

[0012] Before construction, relevant materials and equipment should be brought in according to construction needs, and the quality acceptance, testing and inspection of cement, sand and steel bars should be completed, as well as the inspection of equipment.

[0013] 1.2) Scaffolding erection:

[0014] Use ground-mounted double-row fastener-type steel pipe scaffolding to erect shotcrete scaffolding;

[0015] 1.3) Anchor construction:

[0016] Hand-held pneumatic drills are used to drill holes in rock slopes, and the construction method of "grouting first, then inserting rods" is adopted;

[0017] For the mud-rock section slope, the anchors are made into pointed shapes and driven into the soil manually with a sledgehammer.

[0018] 1.4) Base surface cleaning:

[0019] Before spraying concrete, the floating stones and loose blocks on the slope surface should be removed manually. During the cleaning process, the slope surface should be disturbed to avoid disturbance. High-pressure air should be used to clean the sprayed surface.

[0020] 1.5) Set the spray layer thickness mark:

[0021] After the base surface is cleaned, spray thickness control marks are arranged along the sprayed surface in an evenly spaced grid. The marks are marked on the anchors with red paint;

[0022] 1.6) Steel cage hanging mesh:

[0023] The steel mesh is laid on site manually. The steel mesh is laid along the excavation surface, 3 to 5 cm away from the excavation surface. The steel mesh is tied with galvanized wire in a five-point grid-like manner to form a whole, and is firmly connected with anchor nails.

[0024] 1.7) Spraying concrete construction:

[0025] The spraying material is mixed on site and the wet spraying method is adopted, and the concrete is sprayed by TK961 wet spraying machine for construction.

[0026] In the preferred embodiment, in the step 1.7), the concrete is sprayed in sections and pieces from bottom to top. During spraying, the nozzle is perpendicular to the sprayed surface and maintains a distance of 0.6m to 1.0m. First, the concave part of the sprayed surface is leveled, and then the nozzle is slowly and evenly moved in a spiral shape, pressing the front half circle each time, with a circle diameter of 30cm, to ensure that the sprayed concrete surface is smooth and the average undulation difference is controlled to be no more than 10cm. The overlap width of the segmented spraying joint should not be less than 20cm, and the undulation difference of the overlapped part should be controlled within the allowable range.

[0027] In a preferred embodiment, the step 2) specifically comprises the following steps:

[0028] 2.1) Concrete pouring in layers and blocks:

[0029] Combined with the arrangement of the side pier structural joints, the slope retaining wall is constructed in three parts, with a joint width of 1.0 cm and filled with polyethylene foam extruded board;

[0030] 2.2) Template planning:

[0031] The concrete pouring of slope retaining wall mainly adopts P3015 and P1015 composite steel formwork, and the strips for inserting reinforcement are glued formwork or wooden formwork. The width of glued formwork or wooden formwork is 10cm. Holes are arranged on the formwork according to the position of the inserting reinforcement, and a 100cm×100cm×15cm wooden box is embedded in the reserved anchor hole.

[0032] The template is fixed by φ12 tie rods and φ48, t=3.5mm steel pipes with inner and outer support. The enclosure is composed of two steel pipes connected side by side. The longitudinal enclosure spacing is planned to be 75cm, and the transverse enclosure spacing is planned to be 70cm~75cm. The tie rods are guaranteed to be straight, and the longitudinal and transverse spacing of the tie rods are consistent with the longitudinal and transverse spacing of the enclosure.

[0033] 2.3) Karst water treatment:

[0034] To drain the karst water, first dig a drainage ditch to connect the waterlogged area with the water collection well to drain the water, and then insert a grouting pipe into the cave. The grouting pipe uses a DN100 steel pipe and pours M7.5 mortar into the cave to narrow the water outlet channel so that the buried pipe can drain the water.

[0035] 2.4) Foundation and seam surface treatment construction:

[0036] Before pouring concrete, the bedrock surface is repaired, cleaned and flushed by manual labor and backhoes. After the karst water outlet channel is narrowed, a long-arm backhoe is used to remove the stacked woven bags and silt below the elevation of -5.0m. Before the woven bags are removed, temporary brackets are made to fix the drainage pipes. At the same time, the slope slag, dangerous rocks, etc. are cleaned manually to avoid excessive disturbance of the slope.

[0037] Before pouring the upper concrete, the construction joint surface of the lower concrete layer shall be roughened with high-pressure water, and the joint surface shall be cleaned after roughening to keep it clean and moist;

[0038] 2.5) Steel bar construction:

[0039] The retaining wall concrete is equipped with double-layer steel mesh, and the steel protection layer is 10cm thick. Before the on-site steel bar installation, the sample frame steel bar construction should be carried out according to the measurement and layout, and then the structural steel bar should be installed according to the designed spacing. The steel bar joints are connected mechanically, and the nodes are tied with five-point wire jumps;

[0040] The joints of the steel bars are dispersed and set at the places with less stress. The joints of the longitudinal stress steel bars in the same component are staggered. The joints of the longitudinal stress steel bars in the structural components should be staggered by 35d (d is the larger diameter of the longitudinal stress steel bars) and not less than 500mm. The cross-sectional area of ​​the joints in the same section shall not exceed 50% of the total cross-sectional area of ​​the steel bars.

[0041] 2.6) Embedded parts construction

[0042] The embedded parts include embedded drainage pipes, grouting pipes, anchor holes and inserted bars;

[0043] The pre-buried drainage pipes are arranged in a five-point pattern with a row spacing of 3.0m and are made of φ100mm PVC pipes;

[0044] The pre-buried grouting pipe is a foundation consolidation grouting pre-buried pipe, and the buried pipe material is a DN100mm steel pipe;

[0045] The diameter of the dowel bars is C25mm (HRB400), the spacing between rows is 1.0m, and the buried range is the joint surface between the retaining wall concrete and the gate chamber side wall concrete, wherein one row is arranged on the upstream and downstream surfaces of the retaining wall;

[0046] Before pouring concrete in each warehouse, the corresponding embedded parts must pass the inspection. The embedded parts can be fixed with concrete structural steel bars, and damage to them should be avoided during concrete feeding and vibration.

[0047] 2.7) Template installation and maintenance:

[0048] Before installing the template, measure and lay out according to the design notice, and set control points to facilitate inspection and correction;

[0049] During the installation of the formwork, sufficient temporary fixing facilities should be set up to prevent overturning;

[0050] The contact surface between the formwork and the concrete and the joints between the formwork pieces should be flat and tight, and can be treated with double-sided tape or putty powder to prevent the loss of mortar in the concrete;

[0051] After the template is installed, calibrate the template.

[0052] In the preferred solution, in the step 5), the diameter of the anchor pile rod is 3C32, the hole is made by QZJ-100B down-the-hole drill, the hole diameter is 110mm, and the "first rod insertion, then grouting" method is adopted. The anchor pile construction specifically includes the following steps:

[0053] 5.1) Construction preparation:

[0054] Before anchor construction, materials preparation is carried out in advance, mainly including steel bars, cement and sand that meet relevant quality requirements;

[0055] 5.2) Scaffolding installation:

[0056] Use ground-mounted double-row fastener-type steel pipe scaffolding to erect shotcrete scaffolding;

[0057] 5.3) Drilling:

[0058] The drilling is done with a QZJ-100B down-the-hole drill, the hole diameter is 110mm, and the over-depth is no more than 100mm. After the drilling is completed, high-pressure air is used to clear the debris in the hole to ensure that there is no rock powder or water accumulation in the hole.

[0059] 5.4) Anchor pile grouting and installation:

[0060] The mortar is mixed with a JDY250 mortar mixer and poured with a 2SNS mortar pump. The mortar mix ratio is determined by laboratory experiments, and the strength grade of cement mortar is M30;

[0061] 5.5) Anchor pile elbow welding:

[0062] The elbow of the anchor pile and the steel bar of the slope concrete structure are welded firmly with the helper bar on one side;

[0063] 5.6) Backfill the reserved groove with mortar:

[0064] After the anchor piles are accepted, M30 mortar is used to backfill and level the grooves. The outside of the grooves are closed with glued formwork, which is connected to the concrete structure steel bars by iron wire and fixed inside. A feed opening is reserved at the top of the grooves, and a φ30 vibrating rod is used to vibrate and compact it.

[0065] In the preferred solution, in step 5), the drainage holes are drilled with a hand drill, the hole diameter is φ50mm, the hole position is consistent with the drainage hole reserved in the slope retaining wall, the hole is drilled 2.0m into the rock, and after the drilling is completed, a φ50mm PVC flower pipe is inserted into the hole.

[0066] The invention proposes a ship lock crack treatment construction method, which can effectively solve the slope instability problem caused by the transverse cracks formed on the ship lock slope when a large amount of karst water gushes out, thereby ensuring the slope safety during the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0068] Figure 1 This is a cross-sectional view of the protective retaining wall of the present invention in layers and blocks.

[0069] Figure 2 It is a longitudinal section view of the protective retaining wall of the present invention in layers and blocks.

[0070] Figure 3 This is a cross-sectional tower installation drawing of the slope support scaffolding of the present invention.

[0071] Figure 4 It is a construction drawing of a longitudinal section tower of a slope support scaffolding of the present invention.

[0072] Figure 5 This is a layout diagram of embedded parts for the slope retaining wall of the present invention.

[0073] Figure 6 This is a welding diagram of the anchor pile and the steel mesh of the present invention.

[0074] Figure 7 This is a large-scale drawing of the help strip of the present invention. DETAILED DESCRIPTION

[0075] Embodiment 1:

[0076] A construction method for treating cracks in a ship lock comprises the following steps:

[0077] 1) Anchor spraying support construction;

[0078] 2) Slope retaining wall concrete construction;

[0079] 3) Concrete curing;

[0080] 4) Roughening of concrete surface;

[0081] 5) Construction of anchor piles and drainage holes.

[0082] Embodiment 2:

[0083] On the basis of Example 1, in the anchor spraying support construction, a mesh spraying method is adopted, the spraying layer thickness is 10 cm, the diameter of the steel mesh is φ6.5 (HPB235), the grid spacing is 20 cm×20 cm, and 1.5 m long anchors (C25, HRB400) with a spacing of 2.0 m are used to fix the steel mesh, and a φ50 PVC drainage pipe is set to drain the slope water, and the spacing between the drainage pipes is 3.0 m.

[0084] The raw materials for spraying concrete are:

[0085] (1) Cement: PO.42.5 ordinary Portland cement;

[0086] (2) Sand and stone aggregates: Sand should be hard and durable coarse or medium sand, with a fineness modulus of 2.5 to 3.0 and a moisture content of 5% to 7% when in use; coarse aggregate should be durable pebbles or crushed stones with a particle size not greater than 15 mm;

[0087] (3) Admixtures: The amount of accelerating agent added to the sprayed concrete is determined by tests and approved by the supervisor; after addition, the initial setting time of the sprayed concrete shall not exceed 5 minutes, and the final setting time shall not exceed 10 minutes;

[0088] (4) Steel mesh: Use φ6.5 smooth steel mesh.

[0089] The specific steps include:

[0090] 1.1) Construction preparation:

[0091] Before construction, relevant materials and equipment should be brought in according to construction needs, and the quality acceptance, testing and inspection of cement, sand and steel bars should be completed, as well as the inspection of equipment.

[0092] 1.2) Scaffolding erection (specific details as follows Figure 3-4 shown):

[0093] Use ground-mounted double-row fastener-type steel pipe scaffolding to erect shotcrete scaffolding;

[0094] 1.3) Anchor construction:

[0095] Hand-held pneumatic drills are used to drill holes in rock slopes, and the construction method of "grouting first, then inserting rods" is adopted;

[0096] For the mud-rock section slope, the anchors are made into pointed shapes and driven into the soil manually with a sledgehammer.

[0097] The anchor is made into an "L" shape in the steel bar factory, with the elbow length not less than 15cm. The depth of the anchor into the rock (soil) is determined according to the actual situation on site to ensure that the exposed section meets the needs of fixing the steel mesh;

[0098] 1.4) Base surface cleaning:

[0099] Before spraying concrete, the floating stones and loose blocks on the slope surface should be removed manually. During the cleaning process, the slope surface should be disturbed to avoid disturbance. High-pressure air should be used to clean the sprayed surface.

[0100] The spraying concrete covering construction can be carried out only after the cleaning is completed and accepted;

[0101] 1.5) Set the spray layer thickness mark:

[0102] After the base surface is cleaned, spray thickness control marks are arranged along the sprayed surface in an evenly spaced grid. The marks are marked on the anchors with red paint;

[0103] 1.6) Steel cage hanging mesh:

[0104] The steel mesh is laid on site manually. The steel mesh is laid along the excavation surface, 3 to 5 cm away from the excavation surface. The steel mesh is tied with galvanized wire in a five-point grid-like manner to form a whole, and is firmly connected with anchor nails.

[0105] When laying steel mesh in sections, the longitudinal and transverse reinforcements at the overlap must correspond, and the overlap length should not be less than 20cm;

[0106] 1.7) Spraying concrete construction:

[0107] The spraying material is mixed on site and the wet spraying method is adopted, and the concrete is sprayed by TK961 wet spraying machine for construction.

[0108] In the preferred solution, in the step 1.7), the concrete is sprayed from bottom to top in sections and pieces. During spraying, the nozzle is perpendicular to the sprayed surface and keeps a distance of 0.6m to 1.0m. First, the concave part of the sprayed surface is leveled, and then the nozzle is slowly and evenly moved in a spiral shape, pressing the front half circle each time, and the circle diameter is about 30cm, to ensure that the sprayed concrete surface is smooth and smooth, and the average undulation difference is controlled to be no more than 10cm. The overlap width of the segmented spraying joint should not be less than 20cm, and the undulation difference of the overlap part should be controlled within the allowable range;

[0109] Before spraying, check whether the water and air used in the sprayer are running normally. Operate in the order of ventilation first, power supply, and then material feeding. During the concrete spraying process, the sprayer should be continuously fed with materials to keep the working air pressure of the sprayer stable. When the spraying operation is completed or the spraying operation is interrupted for some reason, the accumulated materials in the sprayer and the feed pipe should be cleaned up.

[0110] After the shotcrete is finally set, watering should be started for curing, and the curing time should be no less than 7 days. The curing water is drained to the foundation pit through drainage ditches and water collection pits set at the foot of the slope, and then drained to the foundation pit through φ100 PVC pipes. The specific engineering quantity is calculated based on the actual occurrence on site;

[0111] If the spraying process is interrupted for some reason, it should be handled according to the state of the previous spraying concrete. For the part that has not initially set, it can be directly sprayed for overlapping protection. For the part that has finally set, the surface of the previous spraying layer should be cleaned with pressurized water or pressurized air before spraying protection;

[0112] The quality inspection of sprayed concrete mainly includes the inspection or examination of compressive strength, spray layer thickness and integrity, specifically:

[0113] Compressive strength: The compressive strength of shotcrete is determined by testing the strength of the test pieces made during the spraying operation;

[0114] Spraying layer thickness: The spraying layer thickness is tested by drilling method. Drilling should be carried out within 8 hours after the spraying of concrete is completed. If the spraying layer thickness is found to be insufficient, additional spraying should be carried out in time.

[0115] Integrity of sprayed concrete: The integrity of sprayed concrete is determined by visual inspection, mainly to check whether there are any leakage, bulging, water leakage, etc. If there are any, they should be chiseled out in time and re-sprayed. For the leaking parts, holes should be drilled to set up drainage pipes for drainage;

[0116] Drainage hole drilling and pipe burying: After the concrete is sprayed, the surveying personnel will measure and lay out the drainage holes according to the design layout and mark them clearly. The drainage holes are drilled with a hand drill with a drilling depth of 10cm to 20cm, and a φ50 PVC pipe is arranged in the hole.

[0117] Embodiment 3:

[0118] Based on Example 1, the slope retaining wall concrete construction specifically includes the following steps:

[0119] 2.1) Concrete pouring in layers and blocks:

[0120] The slope retaining wall concrete is part of the concrete of the pier structure on the left side of the lock chamber. The joints are arranged at 0+119.8m and 0+137.8m below the navigation. The joint width is 1.0cm and filled with polyethylene foam extruded board.

[0121] According to the actual situation on site, the layering principles of this concrete pouring are as follows:

[0122] (1) Concrete filling pond (▽ below -5m elevation) is 1 layer;

[0123] (2) The base concrete (▽-5m~▽-2m) is 1 layer;

[0124] (3) ▽ Above -2m elevation, the layers are divided into 3m (oblique length), with each block divided into 7 layers, for a total of 21 layers;

[0125] (4) Appropriate adjustments may be made during on-site implementation;

[0126] Details are as attached Figure 1-2 shown.

[0127] 2.2) Template planning:

[0128] The concrete pouring of slope retaining wall mainly adopts P3015 and P1015 composite steel formwork, and the strips for inserting reinforcement are glued formwork or wooden formwork. The width of glued formwork or wooden formwork is 10cm. Holes are arranged on the formwork according to the position of the inserting reinforcement, and a 100cm×100cm×15cm wooden box is embedded in the reserved anchor hole.

[0129] The template is fixed by φ12 tie rods and φ48, t=3.5mm steel pipes with inner and outer support. The enclosure is composed of two steel pipes connected side by side. The longitudinal enclosure spacing is planned to be 75cm, and the transverse enclosure spacing is planned to be 70cm~75cm. The tie rods are guaranteed to be straight, and the longitudinal and transverse spacing of the tie rods are consistent with the longitudinal and transverse spacing of the enclosure.

[0130] 2.3) Karst water treatment:

[0131] To drain the karst water, first dig a drainage ditch to connect the waterlogged area with the water collection well to drain the water, and then insert a grouting pipe into the cave. The grouting pipe uses a DN100 steel pipe and pours M7.5 mortar into the cave to narrow the water outlet channel so that the buried pipe can drain the water.

[0132] Due to the influence of the erosion and fracture zone, before the construction of the above-mentioned project, it is necessary to use the sluice chamber excavation slag to backfill the waterlogged area nearby in order to form a construction platform. The backfill slag will be excavated during the subsequent concrete pouring;

[0133] 2.4) Foundation and seam surface treatment construction:

[0134] Before pouring concrete, the bedrock surface is repaired, cleaned and flushed by manual labor and backhoes. After the karst water outlet channel is narrowed, a long-arm backhoe is used to remove the stacked woven bags and silt below the elevation of -5.0m. Before the woven bags are removed, temporary brackets are made to fix the drainage pipes. At the same time, the slope slag, dangerous rocks, etc. are cleaned manually to avoid excessive disturbance of the slope.

[0135] Before pouring the upper concrete, the construction joint surface of the lower concrete layer shall be roughened with high-pressure water, and the joint surface shall be cleaned after roughening to keep it clean and moist;

[0136] 2.5) Steel bar construction:

[0137] The retaining wall concrete is equipped with double-layer steel mesh, and the steel protection layer is 10cm thick. Before the on-site steel bar installation, the sample frame steel bar construction should be carried out according to the measurement and layout, and then the structural steel bar should be installed according to the designed spacing. The steel bar joints are connected mechanically, and the nodes are tied with five-point wire jumps;

[0138] The joints of the steel bars are dispersed and set at the places with less stress. The joints of the longitudinal stress steel bars in the same component are staggered. The joints of the longitudinal stress steel bars in the structural components should be staggered by 35d (d is the larger diameter of the longitudinal stress steel bars) and not less than 500mm. The cross-sectional area of ​​the joints in the same section shall not exceed 50% of the total cross-sectional area of ​​the steel bars.

[0139] 2.6) Embedded parts construction

[0140] The embedded parts include embedded drainage pipes, grouting pipes, anchor holes and inserted bars;

[0141] The pre-buried drainage pipes are arranged in a five-point pattern with a row spacing of 3.0m and made of φ100mmPVC pipes. The pre-buried drainage pipes in the vertical retaining wall above an elevation of ▽12.0m are made of φ50mmPVC pipes. The bottom elevation of the drainage pipe outlet hole is 12.1m, with a lateral inclination of 5%. The reserved anchor holes are arranged in a rectangular pattern with a row spacing of 3.0m and made of φ110mmPVC pipes. The holes are inclined perpendicular to the sloped concrete surface, and the hole position deviation is not more than 100mm.

[0142] The pre-buried grouting pipe is a foundation consolidation grouting pre-buried pipe, as shown in the attached Figure 5-7 As shown, the buried pipe is made of DN100mm steel pipe;

[0143] The diameter of the dowel bars is C25mm (HRB400), the spacing between rows is 1.0m, and the buried range is the joint surface between the retaining wall concrete and the gate chamber side wall concrete, wherein one row is arranged on the upstream and downstream surfaces of the retaining wall;

[0144] Before pouring concrete in each warehouse, the corresponding embedded parts must pass the inspection. The embedded parts can be fixed with concrete structural steel bars, and damage to them should be avoided during concrete feeding and vibration.

[0145] 2.7) Template installation and maintenance:

[0146] 2.7.1) Before installing the template, measure and lay out according to the design notice and set control points to facilitate inspection and correction;

[0147] During the installation of the formwork, sufficient temporary fixing facilities should be set up to prevent overturning;

[0148] The contact surface between the formwork and the concrete and the joints between the formwork pieces should be flat and tight, and can be treated with double-sided tape or putty powder to prevent the loss of mortar in the concrete;

[0149] After the template is installed, the template is checked and the template checklist is filled out;

[0150] During the construction process, the deviation of the lower layer is corrected layer by layer, and the lower end of the template does not go out of place;

[0151] During the concrete pouring process, there must be a dedicated person on duty to check and adjust in time. If there is deformation or displacement, measures should be taken immediately (such as strengthening internal pulling measures, stopping the warehouse for adjustment, etc.), and records should be kept;

[0152] During the vibration process, prevent the vibrator from colliding with the embedded anchor bars to prevent the anchor bars from loosening;

[0153] 2.7.2) Applying mold release agent

[0154] The steel formwork should be cleaned before each use. To prevent rust and facilitate demoulding, the contact surface between the formwork and the concrete should be coated with a release agent. Oily release agents that affect structural construction should not be used. It is strictly forbidden to contaminate the steel bars and concrete joints with release agents.

[0155] 2.7.3) Formwork removal

[0156] When the concrete strength reaches 2.5MPa or above and its surface and edges are guaranteed not to be damaged by demolding, it can be removed;

[0157] 2.7.4) Template Check

[0158] Formwork inspection items include formwork support inspection, formwork quality inspection, formwork installation inspection, re-inspection before pouring, formwork inspection during pouring, formwork removal inspection and formwork repair inspection.

[0159] Embodiment 4:

[0160] On the basis of Example 1, in the construction of anchor piles and drainage holes, the diameter of the anchor pile rod is 3C32, the hole is made by QZJ-100B down-the-hole drill, the hole diameter is 110mm, and the "first rod insertion, then grouting" method is adopted. The anchor pile construction specifically includes the following steps:

[0161] 5.1) Construction preparation:

[0162] Before anchor construction, materials preparation is carried out in advance, mainly including steel bars, cement and sand that meet relevant quality requirements;

[0163] 5.2) Scaffolding installation:

[0164] Use ground-mounted double-row fastener-type steel pipe scaffolding to erect shotcrete scaffolding (see attached for details) Figure 2 shown);

[0165] 5.3) Drilling:

[0166] The drilling is done with a QZJ-100B down-the-hole drill, the hole diameter is 110mm, and the over-depth is no more than 100mm. After the drilling is completed, high-pressure air is used to clear the debris in the hole to ensure that there is no rock powder or water accumulation in the hole.

[0167] 5.4) Anchor pile grouting and installation:

[0168] The mortar is mixed with a JDY250 mortar mixer and poured with a 2SNS mortar pump. The mortar mix ratio is determined by laboratory experiments, and the strength grade of cement mortar is M30;

[0169] The anchor piles are cut and elbowed in the steel bar factory according to the designed length, with a length deviation of no more than 5mm. After processing, they are transported to the site for classification and stacking for use. The anchor piles are made of 3 C32 steel bars welded in a herringbone shape. At the same time, at least one pair of center rings are welded to each bundle of anchor piles, and a protective layer is reserved to prevent the anchor piles from contacting the hole wall after being inserted into the hole.

[0170] First insert the anchor pile and grouting pipe. The anchor pile should be inserted to the bottom of the hole and aligned. The grouting pipe should be inserted to 50~100mm from the bottom of the hole. When the slurry reaches the hole mouth and the thick slurry overflows, slowly pull out the grouting pipe.

[0171] 5.5) Anchor pile elbow welding:

[0172] The elbow of the anchor pile and the steel bar of the slope concrete structure are welded firmly with the helper bar on one side;

[0173] 5.6) Backfill the reserved groove with mortar:

[0174] After the anchor piles are accepted, M30 mortar is used to backfill and level the grooves. The outside of the grooves are closed with glued formwork. The glued formwork is connected to the concrete structure steel bars with iron wire and fixed inside. A feed opening is reserved at the top of the groove, and a φ30 vibrator is used to vibrate and compact it.

[0175] Embodiment 5:

[0176] On the basis of Example 1, in step 5), a hand drill is used to drill the drainage hole, the hole diameter is φ50 mm, the hole position is consistent with the position of the drainage hole reserved for the slope retaining wall, the hole is drilled 2.0 m into the rock, and after the drilling is completed, a φ50 mm PVC flower pipe is inserted into the hole.

Claims

1. A method for treating cracks in a ship lock, characterized in that The following steps are involved: 1) Anchor spraying support construction; 2) Slope retaining wall concrete construction; 3) Concrete curing; 4) Roughening of concrete surface; 5) Construction of anchor piles and drainage holes; The step 1) specifically includes the following steps: 1.1) Construction preparation: Before construction, relevant materials and equipment should be brought in according to construction needs, and the quality acceptance, testing and inspection of cement, sand and steel bars should be completed, as well as the inspection of equipment. 1.2) Scaffolding erection: Use ground-mounted double-row fastener-type steel pipe scaffolding to erect shotcrete scaffolding; 1.3) Anchor construction: Hand-held pneumatic drills are used to drill holes in rock slopes, and the construction method of "grouting first, then inserting rods" is adopted; For the mud-rock section slope, the anchors are made into pointed shapes and driven into the soil manually with a sledgehammer. 1.4) Base surface cleaning: Before spraying concrete, the floating stones and loose blocks on the slope surface should be removed manually. During the cleaning process, the slope surface should be disturbed to avoid disturbance. High-pressure air should be used to clean the sprayed surface. 1.5) Set the spray layer thickness mark: After the base surface is cleaned, spray thickness control marks are arranged along the sprayed surface in an evenly spaced grid. The marks are marked on the anchors with red paint; 1.6) Steel cage hanging mesh: The steel mesh is laid on site manually. The steel mesh is laid along the excavation surface, 3 to 5 cm away from the excavation surface. The steel mesh is tied with galvanized wire in a five-point grid-like manner to form a whole, and is firmly connected with anchor nails. 1.7) Spraying concrete construction: Mix the spraying material on site and use the wet spraying method, using the TK961 wet spraying machine to spray concrete for construction; The step 2) specifically includes the following steps: 2.1) Concrete pouring in layers and blocks: Combined with the arrangement of the side pier structural joints, the slope retaining wall is constructed in three parts, with a joint width of 1.0 cm and filled with polyethylene foam extruded board; 2.2) Template planning: The concrete pouring of slope retaining wall mainly adopts P3015 and P1015 composite steel formwork, and the strips for inserting reinforcement are glued formwork or wooden formwork. The width of glued formwork or wooden formwork is 10cm. Holes are arranged on the formwork according to the position of the inserting reinforcement, and a 100cm×100cm×15cm wooden box is embedded in the reserved anchor hole. The template is fixed by φ12 tie rods and φ48, t=3.5mm steel pipes with inner and outer support. The enclosure is composed of two steel pipes connected side by side. The longitudinal enclosure spacing is planned to be 75cm, and the transverse enclosure spacing is planned to be 70cm~75cm. The tie rods are guaranteed to be straight, and the longitudinal and transverse spacing of the tie rods are consistent with the longitudinal and transverse spacing of the enclosure. 2.3) Karst water treatment: To drain the karst water, first dig a drainage ditch to connect the waterlogged area with the water collection well to drain the water, and then insert a grouting pipe into the cave. The grouting pipe uses a DN100 steel pipe and pours M7.5 mortar into the cave to narrow the water outlet channel so that the buried pipe can drain the water. 2.4) Foundation and seam surface treatment construction: Before pouring concrete, the bedrock surface is repaired, cleaned and flushed by manual labor and backhoes. After the karst water outlet channel is narrowed, a long-arm backhoe is used to remove the stacked woven bags and silt below the elevation of -5.0m. Before the woven bags are removed, temporary brackets are made to fix the drainage pipes. At the same time, the slag and dangerous rocks on the slope are cleaned manually to avoid excessive disturbance of the slope. Before pouring the upper concrete, the construction joint surface of the lower concrete layer shall be roughened with high-pressure water, and the joint surface shall be cleaned after roughening to keep it clean and moist; 2.5) Steel bar construction: The retaining wall concrete is equipped with double-layer steel mesh, and the steel protection layer is 10cm thick. Before the on-site steel bar installation, the sample frame steel bar construction should be carried out according to the measurement and layout, and then the structural steel bar should be installed according to the designed spacing. The steel bar joints are connected mechanically, and the nodes are tied with five-point wire jumps; The joints of the steel bars are dispersed and set at the places with less stress. The joints of the longitudinal stress steel bars in the same component are staggered. The joints of the longitudinal stress steel bars in the structural components should be staggered by 35d (d is the larger diameter of the longitudinal stress steel bars) and not less than 500mm. The cross-sectional area of ​​the joints in the same section shall not exceed 50% of the total cross-sectional area of ​​the steel bars. 2.6) Embedded parts construction The embedded parts include embedded drainage pipes, grouting pipes, anchor holes and inserted bars; The pre-buried drainage pipes are arranged in a five-point pattern with a row spacing of 3.0m and are made of φ100mm PVC pipes; The pre-buried grouting pipe is a foundation consolidation grouting pre-buried pipe, and the buried pipe material is a DN100mm steel pipe; The diameter of the dowel bars is C25mm (HRB400), the spacing between rows is 1.0m, and the buried range is the joint surface between the retaining wall concrete and the gate chamber side wall concrete, wherein one row is arranged on the upstream and downstream surfaces of the retaining wall; Before pouring concrete in each warehouse, the corresponding embedded parts must pass the inspection. The embedded parts can be fixed with concrete structural steel bars, and damage to them should be avoided during concrete feeding and vibration. 2.7) Template installation and maintenance: Before installing the template, measure and lay out according to the design notice, and set control points to facilitate inspection and correction; During the installation of the formwork, sufficient temporary fixing facilities should be set up to prevent overturning; The contact surface between the formwork and the concrete and the joints between the formwork pieces should be flat and tight, and can be treated with double-sided tape or putty powder to prevent the loss of mortar in the concrete; After the template is installed, check the template; In the step 5), the diameter of the anchor pile rod is 3C32, the hole is made by QZJ-100B down-the-hole drill, the hole diameter is 110mm, and the "first rod insertion, then grouting" method is adopted. The anchor pile construction specifically includes the following steps: 5.1) Construction preparation: Before anchor construction, materials preparation is carried out in advance, mainly including steel bars, cement and sand that meet relevant quality requirements; 5.2) Scaffolding installation: Use ground-mounted double-row fastener-type steel pipe scaffolding to erect shotcrete scaffolding; 5.3) Drilling: The drilling is done with a QZJ-100B down-the-hole drill, the hole diameter is 110mm, and the over-depth is no more than 100mm. After the drilling is completed, high-pressure air is used to clear the debris in the hole to ensure that there is no rock powder or water accumulation in the hole. 5.4) Anchor pile grouting and installation: The mortar is mixed with a JDY250 mortar mixer and poured with a 2SNS mortar pump. The mortar mix ratio is determined by laboratory experiments, and the strength grade of cement mortar is M30; 5.5) Anchor pile elbow welding: The elbow of the anchor pile and the steel bar of the slope concrete structure are welded firmly with the helper bar on one side; 5.6) Backfill the reserved groove with mortar: After the anchor piles are accepted, M30 mortar is used to backfill and level the grooves. The outside of the grooves are closed with glued formwork, which is connected to the concrete structure steel bars by iron wire and fixed inside. A feed opening is reserved at the top of the grooves, and a φ30 vibrating rod is used to vibrate and compact it.

2. A method for treating cracks in a ship lock according to claim 1, characterized in that: In the step 1.7), concrete is sprayed from bottom to top in sections and pieces. During spraying, the nozzle is perpendicular to the sprayed surface and maintains a distance of 0.6m to 1.0m. First, the concave part of the sprayed surface is leveled, and then the nozzle is slowly and evenly moved in a spiral shape, pressing the front half circle each time, with a circle diameter of 30cm, to ensure that the sprayed concrete surface is smooth and the average undulation difference is controlled to be no more than 10cm. The overlap width of the segmented spraying joint should not be less than 20cm, and the undulation difference of the overlapped part should be controlled within the allowable range.

3. A method for treating cracks in a ship lock according to claim 1, characterized in that: In the step 5), the drainage hole is drilled with a hand drill, the hole diameter is φ50mm, the hole position is consistent with the hole position of the drainage hole reserved for the slope retaining wall, the hole is drilled 2.0m into the rock, and after the drilling is completed, a φ50mm PVC flower pipe is inserted into the hole.

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