CN113550335A - Construction method for high slope concrete slope protection engineering - Google Patents
Construction method for high slope concrete slope protection engineering Download PDFInfo
- Publication number
- CN113550335A CN113550335A CN202110775936.1A CN202110775936A CN113550335A CN 113550335 A CN113550335 A CN 113550335A CN 202110775936 A CN202110775936 A CN 202110775936A CN 113550335 A CN113550335 A CN 113550335A
- Authority
- CN
- China
- Prior art keywords
- anchor cable
- anchor
- hole
- drilling
- grouting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/40—Miscellaneous comprising stabilising elements
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a construction method of high slope concrete slope protection engineering, which comprises the following construction processes: hole site location lofting → erection of a drilling machine operation platform → in place of a drilling machine → drilling hole → anchor cable manufacture → anchor cable installation → grouting → anchor installation → concrete lattice beam construction → anchor cable tensioning → anchor sealing → surface layer finishing, forming an anchor body with certain strength by using proportioned cement mortar at the bottom end of an anchor hole with effective depth and peripheral soil layers, and then stably integrating an unstable soil layer part with the lattice beam and the concrete surface plate under the action of the anchor cable to ensure the stability of a side slope without further development of structural cracks so as to achieve the protection purpose. The construction process does not need to use large machinery, saves cost, and the working face can be operated at the same time in a segmented and layered mode, so that the construction progress is accelerated, and the construction efficiency is improved.
Description
Technical Field
The invention belongs to the field of high slope protection engineering construction, and particularly relates to a high slope concrete protection engineering construction method.
Background
For foundation pit slope support engineering of shallow, medium and deep soil landslides and soil landslides, soft rocks with broken soil and weathering, high and steep slopes with soft interlayers between soil layers and deep foundation pits of high-rise buildings and other engineering projects in the related fields of foundation pit slopes, highway both-side support, water conservancy, urban construction and the like, high concrete slope protection is generally performed on the slopes in order to prevent slope collapse and ensure operation and personal safety, the high slope concrete slope protection engineering refers to a system for reinforcing soil layers by using the combined action (which can be respectively and independently adopted according to geological conditions) of high-pressure sprayed cement paste, cast-in-place concrete lattice beams and panels and anchor rods and anchor cables driven into the soil layers, and is divided into a temporary support structure and a permanent support structure, and a system for forming the combined action of the cast-in-place concrete members and the prestressed anchor cables with the soil layers and preventing soil bodies from loosening, And (5) separating to achieve a permanent supporting condition.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the construction method for the high-slope concrete slope protection engineering can prevent slope collapse, has obvious reinforcing effect and ensures operation and personal safety.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a construction method for concrete slope protection engineering of a high slope comprises the following steps:
s1: hole position positioning lofting: according to engineering plan and elevation of a work site, accurately measuring the position of an anchor hole on a slope protection to be constructed, and performing positioning lofting at the measured anchor hole position, wherein the allowable deviation of the anchor hole position is +/-50 mm; if the existing brushing slope surface is not smooth or is in a special difficult place, the positioning precision is properly relaxed or the anchor hole positioning is adjusted on the premise of ensuring the stability of the slope body and the structure safety after the approval of a design supervision unit.
S2: erecting a drilling machine operation platform: a drilling machine operation platform is erected on a slope, steel pipes with the size of phi 48mm multiplied by 35 mm are used as supports of the operation platform, the joints of the steel pipe supports are connected through fasteners, the width of the operation platform is five meters, building templates are fully paved on the operation platform, and the templates and scaffolds are firmly bound through iron wires.
S3: positioning a drilling machine: the drilling machine is stably arranged on the erected operation platform, the center of a drill bit of the drilling machine is aligned to the center of the anchor hole position, and the vertical and horizontal allowable deviation of the anchor hole in position is guaranteed to be +/-50 mm, and the elevation allowable deviation is +/-100 mm.
S4: drilling: dry drilling is required during drilling, a water drill is forbidden to be adopted so as to ensure that the construction of the anchor cable does not deteriorate the engineering geological condition of the side slope soil body and ensure the bonding property of the hole wall, and a down-the-hole impact hole forming technology is adopted in the soil layer; in the drilling process, on-site construction records are made on stratum changes, drilling states (drilling pressure and drilling speed), underground water and some special conditions of each hole, the inclination angle allowable deviation of the drill hole is +/-1.0 degrees, the azimuth allowable deviation is +/-2.0 degrees, and each drill hole is marked with a hole number.
In the drilling process, if the drilling is in a bad drilling phenomenon such as hole collapse and hole shrinkage, the drilling needs to be stopped immediately, the wall-fixing grouting treatment is carried out in time, the grouting pressure is 0.10-0.20 MPa, and after the cement mortar is initially set, the hole is swept again for drilling; and after the drilling reaches the designed depth, the drilling can not be stopped immediately, the drilling is required to be stably performed for one to two minutes, and the phenomenon that the hole bottom is sharp and out and the designed hole diameter can not be reached is prevented.
S5: manufacturing an anchor cable: the anchor cable is manufactured by adopting steel stranded wires with the diameter of phi 15.2mm, the tensile strength of the steel stranded wires is not less than 1860Mpa, each hole of the anchor cable is composed of three steel stranded wires, the anchor cable adopts a section corrugated type, a standing ring is arranged every 1.50-2.00 m to separate the steel stranded wires, a guide anchor is arranged at the front end of the anchor cable, each anchor cable is provided with a serial number, and the serial number of each anchor cable corresponds to the serial numbers of different drill holes respectively.
And (3) performing anticorrosion treatment on the free section of the anchor cable, sleeving a polyethylene pipe outside the free section, and arranging a fastening ring and an anchor cable bracket in a manner of bundling the anchor cable into a bundle so as to straighten the anchor cable.
S6: installing an anchor cable: after the length of the anchor cable and the depth of the drilled hole are checked, firstly, high-pressure air is adopted to clean the drilled hole; then, an anchor cable inlet hole is manually placed, after the length of the anchor cable, the straightness and the support ring are checked to be qualified, the anchor cable inlet hole is formed under the condition that a supervision engineer stands by, the anchor cable number is ensured to correspond to the hole number when the anchor cable enters the hole, the anchor cable is strictly pushed according to the anchor hole inclination angle, the anchor cable is pushed smoothly, shaking, twisting and moving are strictly forbidden, the phenomenon of the twisted jamming of the anchor cable is prevented, if the designed depth cannot be reached in the pushing process, the anchor cable is stably pulled out, and the hole is swept again until the anchor cable is installed in place.
S7: grouting: after the anchor cable is installed in place, cleaning the anchor hole by using high-pressure gas, adopting proportioned cement after cleaning, and grouting the anchor hole by using a ZBW150 type piston grouting machine according to a hole bottom grouting method;
the cement is ordinary portland cement, the water cement ratio is 0.38-0.48, 10% of composite expanding agent and 0.60% of high-efficiency early-strength water reducing agent are additionally added, the slurry strength is not less than 40MPa, and the grouting pressure is kept at 0.40-0.60 MPa.
A grout stop plug is arranged at an orifice before grouting to ensure that mortar in the orifice is full, and when grouting operation starts and stops in the midway for a long time, a grouting pump and a grouting pipeline are lubricated by water or dilute cement slurry during operation again; and (5) replenishing primary slurry after grouting for 30-45 min.
In order to form a compact and complete protective layer by grouting, when a finished plastic expansion ring fixed on an anchor cable is processed, the protective layer of the steel strand is ensured to be not less than five millimeters.
S8: anchor installation: after grouting is finished, an anchorage device is installed, and in the installation process, the sequence of the steel strands penetrating into the anchorage device is consistent with the sequence of binding the steel strand bundles, so that cross winding is prevented; before the anchorage device is installed, silt and oil stains in the anchorage device are wiped off by cotton yarn.
S9: and (3) construction of the concrete lattice beam: after the ground tackle installation, carry out sash roof beam concreting, sash roof beam includes lattice crossbeam and lattice crossbeam, clear away rubble and earth around the drill way and on the building base face before pouring, make whole sash roof beam position domatic clean and tidy, then the ligature reinforcing bar, found the mould, and install directional muscle simultaneously, registration arm and fixed steel backing plate, and sheathe in PVC pipe at the anchor rope position, adopt the segmentation to pour the concrete, vibrate during pouring and want evenly, closely knit, in order to ensure the even closely knit and the maintenance of concrete, the concrete after pouring forms the concrete panel, and panel thickness is 250 mm.
The steel backing plate is fixed at the end part of the positioning pipe as a sash beam end face template, and the steel backing plate is vertical to the axis of the positioning pipe.
S10: tensioning the anchor cable: tensioning after the anchor hole grouting body and the lattice beam reach 70% of the design strength, and tensioning the anchor cable once or twice before formal tensioning by taking 10% -20% of the design tensioning load to enable all parts of the anchor cable to be tightly contacted; the steel strand is completely straight, so that the steel strand is stressed uniformly; tensioning the anchor cable for five times, sequentially taking 0.20, 0.50, 0.75, 1.00 and 1.10 times of the design value to perform gradual pretensioning, wherein the first four-stage load stabilization time is five minutes, the last stage load is fifteen minutes, and the tensioning load is strictly prohibited to be added to the locking load for one time; and within forty-eight hours after the anchor cable is stabilized, if obvious stress relaxation occurs, compensation tensioning is required, the compensation tensioning is performed for five minutes after once tensioning is performed on the basis of a locking value until an over-tensioning load which is 1.20 times of a design value is obtained, and the stability is maintained.
Before tensioning, the tensioning machine needs to be calibrated in a matched mode, the PE protective pipe wrapped outside the steel strand is cut off by a saw blade before the steel strand is used, the steel strand is not damaged, the steel strand cannot be burnt by fire, and anti-corrosion grease needs to be removed after the PE is stripped.
S11: sealing an anchor: after the anchor cable tensioning detection reaches 100 percent and is qualified, slowly unloading and taking out the jack; then, cutting off the exposed steel strand after reserving 50mm by using a grinding wheel cutting machine; then carrying out antiseptic treatment on the anchor head; and finally pouring C35 high-strength micro-expansion filling material.
S12: finishing the surface layer: and covering and protecting the poured concrete by using plastic cloth or woven cloth, and well watering and maintaining.
The invention has the following positive beneficial effects:
1. according to the invention, the proportioned cement mortar is utilized to form an anchoring body with certain strength at the bottom end of the anchor hole with effective depth and the peripheral soil layer, and then under the action of the anchor cable, the unstable soil layer part is stably integrated with the lattice beam and the concrete panel, so that the stability of the side slope is ensured, and the structural crack is not further developed, thereby achieving the protection purpose.
2. When the construction is carried out according to the construction method, the reinforcement effect is obvious, and the construction period is short; universal mechanical equipment is used, so that the engineering cost is saved; the operability is strong, and the labor intensity is low.
3. The invention has stable structure, long service life and good finished surface appearance, and is very suitable for permanent slopes in residential districts.
Drawings
FIG. 1 is a process flow diagram of a construction method of a high slope concrete slope protection project of the present invention;
FIG. 2 is a schematic diagram of a high slope concrete slope protection project;
fig. 3 is a full cross-sectional view of the construction of the cable bolt 1.
Detailed Description
The invention will be further explained and explained with reference to the accompanying drawings, fig. 1, fig. 2, fig. 3 and the specific embodiments:
referring to fig. 1, 2 and 3, in which: 1-anchor cable, 2-steel strand, 3-anchor cable bracket, 4-lattice beam, 4-1-lattice beam, 4-2-lattice beam, 5-anchorage device, 6-steel backing plate and 7-grouting body.
A construction method for concrete slope protection engineering of a high slope comprises the following steps:
s1: hole position positioning lofting: according to engineering plan and elevation of a work site, accurately measuring the position of an anchor hole on a slope protection to be constructed, and performing positioning lofting at the measured anchor hole position, wherein the allowable deviation of the anchor hole position is +/-50 mm; if the existing brushing slope surface is not smooth or is in a special difficult place, the positioning precision is properly relaxed or the anchor hole positioning is adjusted on the premise of ensuring the stability of the slope body and the structure safety after the approval of a design supervision unit.
S2: erecting a drilling machine operation platform: a drilling machine operation platform is erected on a slope, steel pipes with the size of phi 48mm multiplied by 35 mm are used as supports of the operation platform, the joints of the steel pipe supports are connected through fasteners, the width of the operation platform is five meters, building templates are fully paved on the operation platform, and the templates and scaffolds are firmly bound through iron wires.
S3: positioning a drilling machine: the drilling machine is stably arranged on the erected operation platform, the center of a drill bit of the drilling machine is aligned to the center of the anchor hole position, and the vertical and horizontal allowable deviation of the anchor hole in position is guaranteed to be +/-50 mm, and the elevation allowable deviation is +/-100 mm.
S4: drilling: dry drilling is required during drilling, a water drill is forbidden to be adopted so as to ensure that the construction of the anchor cable 1 does not deteriorate the engineering geological conditions of the side slope soil body and ensure the bonding property of the hole wall, and a down-the-hole impact hole forming technology is adopted in the soil layer; in the drilling process, on-site construction records are made on stratum changes, drilling states (drilling pressure and drilling speed), underground water and some special conditions of each hole, the inclination angle allowable deviation of the drill hole is +/-1.0 degrees, the azimuth allowable deviation is +/-2.0 degrees, and each drill hole is marked with a hole number.
In the drilling process, if the drilling is in a bad drilling phenomenon such as hole collapse and hole shrinkage, the drilling needs to be stopped immediately, the wall-fixing grouting treatment is carried out in time, the grouting pressure is 0.10-0.20 MPa, and after the cement mortar is initially set, the hole is swept again for drilling; and after the drilling reaches the designed depth, the drilling can not be stopped immediately, the drilling is required to be stably performed for one to two minutes, and the phenomenon that the hole bottom is sharp and out and the designed hole diameter can not be reached is prevented.
S5: manufacturing an anchor cable 1: the anchor cable 1 is manufactured by adopting steel strands 2 with the diameter of phi 15.2mm, the tensile strength of the steel strands 2 is not less than 1860Mpa, each hole anchor cable 1 is composed of three steel strands 2, the anchor cable 1 adopts a section ripple type, a standing ring is arranged every 1.50-2.00 m, the steel strands 2 are separated, a guide anchor is arranged at the front end of the anchor cable 1, each anchor cable 1 is provided with a serial number, and the serial number of each anchor cable 1 corresponds to the serial numbers of different drill holes respectively.
And (3) performing anticorrosion treatment on the free section of the anchor cable 1, sleeving a polyethylene pipe outside the free section, arranging a fastening ring and an anchor cable bracket 3 in a manner of five meters per meter, and bundling the anchor cable 1 into a bundle so as to straighten the anchor cable.
S6: installing an anchor cable 1: after the length of the anchor cable 1 and the depth of a drilled hole are checked, firstly, high-pressure air is adopted to clean the drilled hole; then, an anchor cable 1 hole is placed manually, after the length of the anchor cable 1 is detected to be qualified through the straightness, the support ring is used, after the grouting pipe is bound and detected, the anchor cable 1 hole is formed under the side station of a supervision engineer, the anchor cable 1 number is ensured to correspond to the hole number when the anchor cable 1 hole is formed, the anchor cable is strictly pushed according to the anchor hole inclination angle, the anchor cable 1 is pushed smoothly, the shaking, the twisting and the moving are strictly prohibited, the phenomenon of the distortion and the blocking of the anchor cable 1 is prevented, if the designed depth cannot be reached in the pushing process, the anchor cable 1 is stably pulled out, and the hole is swept again until the anchor cable 1 is installed in place.
S7: grouting: and after the anchor cable 1 is installed in place, cleaning the anchor hole by using high-pressure gas, adopting proportioned cement after cleaning, and grouting the anchor hole by using a ZBW150 type piston grouting machine according to a hole bottom grouting method.
The cement is ordinary Portland cement with a water cement ratio of 0.45, 10% of composite expanding agent and 0.60% of high-efficiency early-strength water reducing agent, the slurry strength is not less than 40MPa, and the grouting pressure is kept at 0.50 MPa.
A grout stop plug is arranged at an orifice before grouting to ensure that mortar in the orifice is full, and when grouting operation starts and stops in the midway for a long time, a grouting pump and a grouting pipeline are lubricated by water or dilute cement slurry during operation again; and grouting for 40min, and then replenishing the grout.
In order to form a compact and complete protective layer by grouting, when a finished plastic expansion ring fixed on the anchor cable 1 is processed, the protective layer of the steel strand 2 is ensured to be not less than five millimeters.
S8: and (3) mounting an anchorage device 5: after grouting is finished, the anchorage device 5 is installed, and in the installation process, the sequence of the steel strands 2 penetrating into the anchorage device 5 is consistent with the sequence of binding the steel strands 2, so that cross winding is prevented; before the anchorage device 5 is installed, silt and oil stains in the anchorage device 5 are wiped off by cotton yarn.
S9: and (3) construction of the concrete lattice beam: after the anchorage device 5 is installed, pouring concrete into the lattice beam 4, wherein the lattice beam 4 comprises a lattice crossbeam 4-1 and a lattice crossbeam 4-2, before pouring, broken stones and soil around an orifice and on a building base surface are removed, so that the slope of the whole lattice beam 4 is neat and clean, then reinforcing steel bars are bound, a mold is erected, and simultaneously, a directional bar, a positioning pipe and a fixed steel base plate 6 are installed, a PVC pipe is sleeved on the anchor cable 1, sectional pouring concrete is adopted, the vibration is uniform and dense during pouring, so that the uniformity, compactness and curing of the concrete are ensured, the poured concrete forms a concrete panel, and the thickness of the panel is 250 mm.
S10: tensioning an anchor cable 1: when the anchor hole grouting body 7 and the lattice beam reach 70% of the design strength, tensioning is carried out, 10% -20% of design tensioning load is adopted before formal tensioning, and the anchor cable 1 is tensioned once or twice to enable all parts to be in close contact; the steel strand 2 is completely straight, so that the steel strand 2 is stressed uniformly; tensioning the anchor cable 1 for five times, sequentially taking 0.20, 0.50, 0.75, 1.00 and 1.10 times of the design value to perform gradual pretensioning, wherein the first four-stage load stabilization time is five minutes, the last stage load is fifteen minutes, and the tensioning load is strictly prohibited to be added to the locking load for one time; within forty-eight hours after the anchor cable 1 is stabilized, if obvious stress relaxation occurs, compensation tensioning must be carried out, the compensation tensioning is carried out for one time on the basis of a locking value until an over-tensioning load which is 1.20 times of a design value is obtained, and the stabilization is carried out for five minutes.
Before tensioning, a tensioning machine needs to be calibrated in a matched mode, the steel strand 2 is used, a PE protective pipe wrapped outside the steel strand 2 is cut off by a saw blade before tensioning, the steel strand 2 is not damaged, the steel strand 2 cannot be burnt by fire, and anti-corrosion grease needs to be removed after the PE is stripped.
S11: sealing an anchor: after the anchor cable 1 is qualified after being tensioned and detected to reach 100%, slowly unloading and taking out the jack; then, cutting off the exposed part of the steel strand 2 after reserving 50mm by using a grinding wheel cutting machine; then carrying out antiseptic treatment on the anchor head; and finally pouring C35 high-strength micro-expansion filling material.
S12: finishing the surface layer: and covering and protecting the poured concrete by using plastic cloth or woven cloth, and well watering and maintaining.
Materials and equipment:
the main materials used in the present invention are shown in the following table:
| serial number | Name (R) | Specification of | Site of use |
| 1 | Reinforcing bar | Φ8、10、14、18 | Lattice beam and |
| 2 | Cement | P.O 42.5 | Grouting |
| 3 | Anchor cable | 3S15.2（d=180mm） | |
| 4 | Steel backing plate | 150*150*15（mm） | |
| 5 | Anti-corrosion sleeve | Anchor cable |
The main construction equipment and measuring instruments used in the invention are shown in the following chart:
| serial number | Device name | Specification, model | Unit of | Number of | Remarks for note |
| 1 | Anchoring drilling machine | MG60 | Table (Ref. Table) | 2 | Anchor cable pore-forming |
| 2 | Grouting pump | BW150 | Table (Ref. Table) | 1 | Pore-forming |
| 3 | Small forklift | 926 | Table (Ref. Table) | 1 | |
| 4 | Back shovel | CAT320 | Table (Ref. Table) | 1 | Substrate forming |
| 5 | Mixer | JW900 | Table (Ref. Table) | 1 | Mixing of |
| 6 | Steel bar straightening machine | 2.5KW | Table (Ref. Table) | 1 | Processing of reinforcing |
| 7 | Steel bar cutting machine | 1.5KW | Table (Ref. Table) | 1 | Processing of reinforcing bars |
| 8 | GPS | Lingrui 86 | Table (Ref. Table) | 1 | Positioning measurement |
| 9 | Total station | TCR802 | Table (Ref. Table) | 1 | Positioning measurement |
| 10 | Level gauge | DS3 | Table (Ref. Table) | 1 | Elevation |
Quality control: the relevant standards and specifications for the implementation of the method are as follows:
building foundation pit support technical regulation JGJG120-2012
Construction slope engineering technical Specification GB50330-2013
Construction foundation pit engineering monitoring technical Specification GB50497-2009
Reinforcement welding and acceptance Specification JGJ18-2012
Construction foundation pit engineering monitoring technical Specification GB50497-2009
Safety measures are as follows: establishing a safety management mechanism, making a safety management system, insisting on a safety production policy of 'safety first and prevention first', regularly checking and implementing safety responsibility, strictly executing a safety production reward and punishment system, and following responsibility and seriously processing a violation operator; before going on duty, safety training work is required, constructors need to wear safety helmets when entering the site, and operators follow relevant safety operation rules; various machines and tools are in a good state, necessary protection measures are required to be set for high-altitude operation, and operators need to wear safety belts; the abrasive wheel cutting machine used for cutting the steel strand 2 is provided with a safety shield to prevent the broken piece from hurting people; the grouting pipeline is smooth and is not blocked, the phenomenon that the grout is sprayed out suddenly to hurt people is avoided, and when the grouting pipeline is not used, clear water is injected in time to wash the grouting pipeline; all parts of the tensioning machine tool, especially the connection points of the high-pressure oil pipe, are firm so as to avoid hurting people by sudden fracture and ejection from a separation opening; in the tensioning process, people cannot stand in front of the jack so as to prevent accidents caused by breakage of the anchor cable 1; the night construction should have sufficient lighting.
And (3) environmental protection measures: the concrete materials splashed out of the template in the blanking process need to be cleaned in time and are timely conveyed to a slag disposal site; after pouring is finished, the concrete tank trucks return to a mixing station for cleaning in a unified way, and the cleaned wastewater is poured into a sedimentation tank and is discharged to a river channel after sedimentation; the redundant cement paste in construction should be stacked and managed intensively, cleaned every day, and the arbitrary discharge of the cement paste is strictly forbidden; a dust collector is arranged at the hole opening of the drilled hole, so that the soil powder cannot fly with the wind and pollute the atmosphere; construction is strictly carried out according to the relevant regulations of national environmental protection; the environment sanitation around the construction site is kept, the garbage, the muck, the waste and the sewage are not dumped randomly, the construction materials such as mortar and the like or cement, lime and the like are used on the site, and the cleaning is carried out at any time.
And (3) benefit analysis: in the construction process, the lattice beam and the prestressed anchor cable 1 are mainly applied and organically combined, and concrete is cast in situ after the lattice beam and the prestressed anchor cable are fixed by a template, so that the quality of the formed concrete meets the design requirement and the appearance is good; the construction process does not need to use large machinery, saves cost, and the working face can be operated at the same time in a segmented and layered mode, so that the construction progress is accelerated, and the construction efficiency is improved.
By adopting the construction scheme of the high slope concrete supporting engineering, compared with the conventional construction method, the cost is saved by about 1/3, the construction period is shortened by two months, and good social benefits are created for units.
Application example 1: project A area engineering for transforming and arranging cell in Mianchi shed house area
Overview of the engineering: the project is located in the west of Yangshao town of Mianchi county of the three gorges city, and the south of the Yangshao town of the Mianchi county through ten roads, the north of the project field is high, the south is low, the east is high, the west is low, the east is high, the east is connected with a high slope through ten roads, the construction area is permanently supported, the height difference is about 13 meters, the soil body stability is poor, and the water and soil loss is serious. Therefore, the project part in the area A carries out supporting and reinforcing treatment on the dangerous high slope. The construction quality of the high slope concrete support engineering meets the requirements of owners, the owners and engineers highly evaluate the appearance quality of the concrete supported by the slope, and the overall stability of the slope is also powerfully guaranteed.
Application example 2: a cell project B area project is transformed and arranged in a Mianchi greenhouse area, and the construction method is also applied to the project, so that good economic benefits and social benefits are obtained.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (9)
1. A construction method for concrete slope protection engineering of a high slope is characterized by comprising the following steps:
s1: hole position positioning lofting: according to engineering plan and elevation of a work site, accurately measuring the position of an anchor hole on a slope protection to be constructed, and performing positioning lofting at the measured anchor hole position, wherein the allowable deviation of the anchor hole position is +/-50 mm;
s2: erecting a drilling machine operation platform: erecting a drilling machine operation platform on the slope, wherein the operation platform adopts steel pipes as supports, the joints of the steel pipe supports are connected by fasteners, building templates are fully paved on the operation platform, and the templates are firmly bound with scaffolds by iron wires;
s3: positioning a drilling machine: the drilling machine is stably arranged on the erected operation platform, the center of a drill bit of the drilling machine is aligned to the center of a hole site of the anchor hole, and the vertical and horizontal allowable deviation of the anchor hole in drilling position is ensured to be +/-50 mm, and the elevation allowable deviation is +/-100 mm;
s4: drilling: dry drilling is required during drilling, on-site construction records are made on stratum change, drilling bit pressure and drilling speed, underground water and some special conditions of each hole in the drilling process, the allowable deviation of the drilling dip angle is +/-1.0 degrees, the allowable deviation of the azimuth is +/-2.0 degrees, and each drilling hole is marked with a hole number;
s5: manufacturing an anchor cable: manufacturing an anchor cable by using steel stranded wires, wherein each hole of the anchor cable consists of three steel stranded wires, the anchor cable is in a section corrugated type, a standing ring is arranged every 1.50-2.00 meters, a guide anchor is arranged at the front end of the anchor cable, each anchor cable is provided with a serial number, and the serial number of each anchor cable corresponds to the serial number of different drilled holes respectively;
s6: installing an anchor cable: after the length of the anchor cable and the depth of the drilled hole are checked, firstly, high-pressure air is adopted to clean the drilled hole; then, manually placing anchor cable inlet holes, ensuring that the anchor cable numbers correspond to the hole numbers when the anchor cables enter the holes, and strictly pushing according to the inclination angles of the anchor holes;
s7: grouting: after the anchor cable is installed in place, cleaning the anchor hole by using high-pressure gas, adopting proportioned cement after cleaning, and grouting the anchor hole by using a ZBW150 type piston grouting machine according to a hole bottom grouting method;
s8: anchor installation: after grouting is finished, an anchorage device is installed, and in the installation process, the sequence of the steel strands penetrating into the anchorage device is consistent with the sequence of binding the steel strand bundles, so that cross winding is prevented; before the anchorage device is installed, silt and oil stains in the anchorage device are wiped off by cotton yarn;
s9: and (3) construction of the concrete lattice beam: after the anchorage device is installed, carrying out concrete pouring on the sash beam, removing broken stones and soil around the orifice and on a building base surface before pouring to ensure that the slope at the position of the whole sash beam is clean, then binding reinforcing steel bars and erecting a mold, simultaneously installing directional bars, positioning pipes and fixed steel backing plates, sleeving PVC pipes on the anchor cable positions, adopting segmented concrete pouring, and uniformly and compactly vibrating during pouring to ensure that the concrete is uniformly, compactly and cured;
s10: tensioning the anchor cable: when the anchor hole grouting body and the lattice beam reach 70% of the design strength, tensioning is carried out, 10% -20% of the design tensioning load is adopted before formal tensioning, the anchor cable is tensioned for one to two times, all parts of the anchor cable are tightly contacted, and the steel strand is completely straight, so that the steel strand is uniformly stressed; tensioning the anchor cable for five times, sequentially taking 0.20, 0.50, 0.75, 1.00 and 1.10 times of the design value to perform gradual pretensioning, wherein the first four-stage load stabilization time is five minutes, the last stage load is fifteen minutes, and the tensioning load is strictly prohibited to be added to the locking load for one time; within forty-eight hours after the anchor cable is stabilized, if obvious stress relaxation occurs, compensation tensioning is required, the compensation tensioning is performed on the basis of a locking value until an over-tensioning load with a design value of 1.20 times is obtained, and the stabilization is carried out for five minutes;
s11: sealing an anchor: after the anchor cable tensioning detection reaches 100 percent and is qualified, slowly unloading and taking out the jack; then, cutting off the exposed steel strand after reserving 50mm by using a grinding wheel cutting machine; then carrying out antiseptic treatment on the anchor head; finally pouring C35 high-strength micro-expansion filler;
s12: finishing the surface layer: and covering and protecting the poured concrete by using plastic cloth or woven cloth, and well watering and maintaining.
2. The construction method of the high slope concrete slope protection project according to claim 1, characterized in that: in step S4, in the drilling process, if the drilling is in poor drilling phenomena such as hole collapse and hole shrinkage, the drilling is stopped immediately, wall-fixing grouting treatment is performed in time, the grouting pressure is 0.10-0.20 MPa, and after cement mortar is initially set, hole sweeping drilling is performed again; and after the drilling reaches the designed depth, the drilling can not be stopped immediately, the drilling is required to be stably performed for one to two minutes, and the phenomenon that the hole bottom is sharp and out and the designed hole diameter can not be reached is prevented.
3. The construction method of the high slope concrete slope protection project according to claim 1, characterized in that: in step S5, a free section of the anchor cable is subjected to corrosion protection, and after the corrosion protection, a polyethylene pipe is sleeved outside, a fastening ring and an anchor cable bracket are arranged every five meters, and the anchor cable is bundled to be straight.
4. The construction method of the high slope concrete slope protection project according to claim 1, characterized in that: in step S6, the anchor cable is pushed smoothly, and is strictly prohibited from shaking, twisting and shifting, so as to prevent the anchor cable from being twisted and jammed, and if the anchor cable cannot reach the designed depth in the pushing process, the anchor cable is pulled out stably, and then the hole is swept again until the anchor cable is installed in place.
5. The construction method of the high slope concrete slope protection project according to claim 1, characterized in that: in step S7, the cement is ordinary portland cement with a water cement ratio of 0.38-0.48, 10% of composite expanding agent and 0.60% of high-efficiency early-strength water reducing agent are added, the slurry strength is not less than 40MPa, and the grouting pressure is kept at 0.40-0.60 MPa.
6. The construction method of the high slope concrete slope protection project according to claim 5, characterized in that: in step S7, a grout stop plug is provided at the front orifice of grouting to ensure that the mortar in the hole is full, and when the grouting operation starts and stops in the middle for a long time, the grouting pump and the grouting pipeline are lubricated by water or dilute cement slurry during the operation; and (5) replenishing primary slurry after grouting for 30-45 min.
7. The construction method of the high slope concrete slope protection project according to claim 6, characterized in that: in step S7, in order to form a compact and complete protective layer by grouting, it is necessary to ensure that the protective layer of the steel strand is not less than five millimeters when the finished plastic expansion ring fixed on the anchor cable is processed.
8. The construction method of the high slope concrete slope protection project according to claim 6, characterized in that: in step S9, the steel shim plate is fixed to the end of the positioning tube as a sash beam end face template, and the steel shim plate is perpendicular to the axis of the positioning tube.
9. The construction method of the high slope concrete slope protection project according to claim 1, characterized in that: in step S10, a stretching tool needs to be calibrated before stretching, a PE protection pipe wrapped around a steel strand is cut with a saw blade before stretching, but the steel strand is not damaged and has to be burned, and after peeling the PE, the corrosion-resistant grease needs to be removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110775936.1A CN113550335A (en) | 2021-07-09 | 2021-07-09 | Construction method for high slope concrete slope protection engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110775936.1A CN113550335A (en) | 2021-07-09 | 2021-07-09 | Construction method for high slope concrete slope protection engineering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113550335A true CN113550335A (en) | 2021-10-26 |
Family
ID=78102895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110775936.1A Pending CN113550335A (en) | 2021-07-09 | 2021-07-09 | Construction method for high slope concrete slope protection engineering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113550335A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263172A (en) * | 2021-12-16 | 2022-04-01 | 中交三公局第三工程有限公司 | Pressure-bearing bag type expanded anchor cable and sash beam construction method |
| CN117248546A (en) * | 2023-11-16 | 2023-12-19 | 西南交通大学 | Quick construction method and structure of anchor cable frame beam without grooving |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000282478A (en) * | 1999-03-31 | 2000-10-10 | Raito Kogyo Co Ltd | Construction method for stabilizing face of slope |
| US20030099518A1 (en) * | 1999-12-03 | 2003-05-29 | Barley Anthony Donald | Slope stabilising means |
| CN205088697U (en) * | 2015-11-13 | 2016-03-16 | 中国电建集团成都勘测设计研究院有限公司 | Garrulous rock matter slope reinforcement structure of loosing |
| CN106320350A (en) * | 2015-06-24 | 2017-01-11 | 辽宁有色基础工程公司 | Concrete pouring method for reinforced concrete lattice beams in slope treatment |
| CN111910660A (en) * | 2020-09-17 | 2020-11-10 | 兰州理工大学 | Ultrahigh slope supporting structure and construction method thereof |
| CN112176952A (en) * | 2020-11-06 | 2021-01-05 | 中国电建集团华东勘测设计研究院有限公司 | Anchor cable support system for tunnel top soil high slope and construction method |
| CN112921992A (en) * | 2021-01-25 | 2021-06-08 | 中国一冶集团有限公司 | Combined supporting structure for complex rock high slope and construction method |
-
2021
- 2021-07-09 CN CN202110775936.1A patent/CN113550335A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000282478A (en) * | 1999-03-31 | 2000-10-10 | Raito Kogyo Co Ltd | Construction method for stabilizing face of slope |
| US20030099518A1 (en) * | 1999-12-03 | 2003-05-29 | Barley Anthony Donald | Slope stabilising means |
| CN106320350A (en) * | 2015-06-24 | 2017-01-11 | 辽宁有色基础工程公司 | Concrete pouring method for reinforced concrete lattice beams in slope treatment |
| CN205088697U (en) * | 2015-11-13 | 2016-03-16 | 中国电建集团成都勘测设计研究院有限公司 | Garrulous rock matter slope reinforcement structure of loosing |
| CN111910660A (en) * | 2020-09-17 | 2020-11-10 | 兰州理工大学 | Ultrahigh slope supporting structure and construction method thereof |
| CN112176952A (en) * | 2020-11-06 | 2021-01-05 | 中国电建集团华东勘测设计研究院有限公司 | Anchor cable support system for tunnel top soil high slope and construction method |
| CN112921992A (en) * | 2021-01-25 | 2021-06-08 | 中国一冶集团有限公司 | Combined supporting structure for complex rock high slope and construction method |
Non-Patent Citations (2)
| Title |
|---|
| 中铁四局集团有限公司: "《高速铁路路基工程施工技术》", 31 July 2013, pages: 156 - 159 * |
| 王双龙: "预应力锚索格构梁加固高边坡施工技术", 《山西建筑》, vol. 34, no. 4, 28 February 2008 (2008-02-28), pages 294 - 295 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263172A (en) * | 2021-12-16 | 2022-04-01 | 中交三公局第三工程有限公司 | Pressure-bearing bag type expanded anchor cable and sash beam construction method |
| CN117248546A (en) * | 2023-11-16 | 2023-12-19 | 西南交通大学 | Quick construction method and structure of anchor cable frame beam without grooving |
| CN117248546B (en) * | 2023-11-16 | 2024-02-02 | 西南交通大学 | Quick construction method and structure of anchor cable frame beam without grooving |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111455855B (en) | Construction process of main bridge of double-tower single-cable-plane short-tower cable-stayed bridge | |
| CN102031784B (en) | Slope protection pile pouring and cable bolting construction method for deep foundation pit | |
| CN111576481A (en) | Tunnel portal open cut tunnel reinforcing construction method | |
| AU2021106549B4 (en) | A construction method for an unbonded prestressed large-diameter reinforced-concrete thin-walled circular tank | |
| CN110184941B (en) | Bridge main tower construction method | |
| CN113550335A (en) | Construction method for high slope concrete slope protection engineering | |
| CN112921992A (en) | Combined supporting structure for complex rock high slope and construction method | |
| CN112228130B (en) | Construction method for pulling out anchor cable intruding into shield zone of urban subway | |
| CN113774917B (en) | Safe construction method for earth and rockfill excavation and side slope supporting engineering | |
| CN111676969A (en) | Foundation pit bag type enlarged footing anchor cable supporting structure and construction method | |
| CN111997066A (en) | Manufacturing and construction method of assembled prestressed anchor cable frame beam for slope reinforcement | |
| CN112160324A (en) | Construction method for deep foundation pit support | |
| CN115262626B (en) | Construction method of underground space prestress steel reinforced concrete top cover under ultra-large span heavy load | |
| CN113202173A (en) | Construction method for temporarily replacing cross-foundation-pit concrete pipe with steel pipe in deep foundation pit construction | |
| CN110747762A (en) | Cement member crossing highway and its installation method | |
| CN113756339A (en) | Construction method of prestressed anchor cable frame beam structure | |
| CN212561494U (en) | Prestressed anchor rod pile for reinforcing foundation through rotary spraying, powder spraying or stirring pile | |
| CN117449216A (en) | Bridge lower beam construction method | |
| CN113279402A (en) | Chain weft and grid mesh type reducing reinforcement cage and anchor rod | |
| CN102787594A (en) | Dry-boring rapid construction method for cast-in-place pile | |
| CN210712595U (en) | Cement member crossing road | |
| CN113338340A (en) | Reverse construction method for vertical shaft ensuring normal use of existing pipeline | |
| CN112227814A (en) | Method for dismantling straight-barrel type concrete tower body | |
| CN113846695B (en) | Reverse construction method basement construction method | |
| CN116575475A (en) | Construction method of ultra-large foundation pit supporting structure of fully-buried sewage plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211026 |
|
| RJ01 | Rejection of invention patent application after publication |