阅读说明：本技术 钢板桩护坡区域锚索施工方法 (Anchor cable construction method for steel sheet pile slope protection area ) 是由 林全忠 韩晓峰 朱辉宝 魏鑫 尤运林 于 2021-08-04 设计创作，主要内容包括：本发明涉及基坑工程中钢板桩护坡后再进行锚索施工技术领域,公开了钢板桩护坡区域锚索施工方法。包括以下施工步骤：S1：施工准备；S2：在地面进行基坑围护结构及钢板桩的施工,在进行施工时,确定好锚索的施工位置,将该位置的钢板桩采用短桩；S3：进行土体开挖,挖至桩顶标高；S4：清理桩头后进行锚索施工；S5：锚索施工完成后,进行冠梁施工；S6：冠梁及锚索的强度达到要求后,冠梁背后土体进行回填,接着进行锚索的张拉锁定；S7：继续进行坑内土体的开挖,开挖至坑底后施作地下室结构,地下室结构施工出地面后,将土体回填至地面；S8：土体回填完成后,钢板桩拔出回收再利用。优化了施工顺序,使其更符合常规施工习惯,保证了施工的流畅性。(The invention relates to the technical field of anchor cable construction after steel sheet pile slope protection in foundation pit engineering, and discloses an anchor cable construction method for a steel sheet pile slope protection area. The method comprises the following construction steps: s1: construction preparation; s2: constructing a foundation pit support structure and a steel sheet pile on the ground, determining the construction position of an anchor cable during construction, and adopting a short pile as the steel sheet pile at the position; s3: excavating a soil body to reach the elevation of the pile top; s4: cleaning the pile head and then performing anchor cable construction; s5: after the anchor cable construction is finished, performing crown beam construction; s6: after the strength of the crown beam and the anchor cable meets the requirement, backfilling a soil body behind the crown beam, and then tensioning and locking the anchor cable; s7: continuing to excavate the soil body in the pit, constructing a basement structure after excavating to the bottom of the pit, and backfilling the soil body to the ground after the basement structure is constructed out of the ground; s8: and after the soil body is backfilled, pulling out the steel sheet pile for recycling. The construction sequence is optimized, so that the construction method is more consistent with the conventional construction habit, and the construction smoothness is ensured.)

1. The anchor cable construction method for the steel sheet pile slope protection area is characterized by comprising the following construction steps:

s1: construction preparation, namely, firmly constructing a foundation for the anchor cable (2);

s2: constructing a foundation pit support structure (1), a steel plate short pile (3) and a steel plate long pile (4) on the ground, determining the construction position of the anchor cable (2) during construction, and adopting the steel plate short pile (3) as the steel plate pile at the position;

s3: excavating a soil body to reach the elevation of the pile top;

s4: the anchor cable (2) construction is carried out after the pile head is cleaned, the position accuracy is ensured when the anchor cable (2) is constructed, and the construction anchor cable hole is just below the steel plate short pile (3) to avoid the steel plate long pile (4);

s5: after the construction of the anchor cable (2) is finished, constructing a crown beam (5), and after the strength of the anchor cable (2) meets the requirement, erecting a reinforcement cage and a template at the exposed end of the anchor cable (2) to pour the crown beam (5);

s6: after the strength of the crown beam (5) and the anchor cable (2) meets the requirement, backfilling a soil body behind the crown beam (5), and then tensioning and locking the anchor cable (2);

s7: continuing to excavate the soil body in the pit, constructing a basement structure after excavating to the bottom of the pit, and backfilling the soil body to the ground after the basement structure is constructed out of the ground;

s8: and after the soil body is backfilled, pulling out the steel sheet pile for recycling.

2. The anchor cable construction method of the steel sheet pile slope protection area as claimed in claim 1, characterized in that: for the construction preparation in the construction step S1, the construction implementation steps are as follows:

s101: before starting work, related technicians should be organized to carefully learn the design of the implementation construction organization, read and examine construction drawings, clarify related technical problems and be familiar with specifications and technical standards;

s102: according to the technical meeting bottom standard requirements, technical meeting bottom is compiled, technical meeting bottom is carried out on constructors, pre-post technical training is carried out on the constructors involved, and post-post is certified after the assessment is qualified;

s103: construction safety guarantee measures and emergency plans should be formulated.

3. The anchor cable construction method of the steel sheet pile slope protection area as claimed in claim 1, characterized in that: aiming at the construction of the anchor cable (2) in the construction step S4, the construction steps are as follows:

s410: cleaning the slope surface to ensure the tamping flatness of the slope protection surface, and then performing construction measurement on the slope surface to determine construction hole positions of the anchor cables (2);

s420: drilling an installation hole of the anchor cable (2) by using a drilling machine, and blowing chips and cleaning the hole by using high-pressure air;

s430: after the hole cleaning of the anchor cable (2) is finished, the anchor cable (2) can be manufactured on site, or the manufacture of the anchor cable (2) is finished in advance according to the design requirement, and the manufactured anchor cable (2) is installed in the installation hole;

s440: after the anchor cable (2) is installed, concrete mortar is manufactured on site, the concrete mortar is poured into the installation hole of the anchor cable (2), grouting of the anchor cable (2) is carried out by adopting hole bottom grouting construction, the mortar is poured from the hole bottom, and air is exhausted from the exhaust hole;

s450: after the mortar is poured, tensioning the anchor cable (2) is carried out after the grouting and anchor beam concrete reach 70% of the design strength, calibrating tensioning equipment before tensioning the anchor cable (2), and treating an anchor head after tensioning.

4. The anchor cable construction method of the steel sheet pile slope protection area as claimed in claim 3, wherein: tensioning the anchor cable (2) by two times step by step, wherein the first tensioning is 70 percent of the total tensioning force, and the interval time between the two times of tensioning is preferably not less than 3-5 days; in order to reduce the prestress loss, the total tension force should include an over-tension value, preferably 15-25% when the free section is a soil layer, and preferably 10-15% when the free section is a rock layer.

5. The anchor cable construction method of the steel sheet pile slope protection area as claimed in claim 3, wherein: the construction notice of the anchor cable (2) is as follows:

1) the hole forming error is strictly controlled in the drilling process, the inclination angle and the horizontal angle error are controlled to be below 1 degree, the hole inclination deviation is less than 2 percent, rock strata around the drilled hole are not disturbed as much as possible, and the hole is continuously blown for at least 10min from the bottom of the drilled hole to the outside after the drilling is finished;

2) when the anchor cable (2) is manufactured, the anchor cable (2) is prevented from being twisted and bent, so that the generation of secondary stress is reduced as much as possible; the corrosion prevention of the free section of the anchor cable (2) is carefully done, and the anchor cable is protected from corrosion oil according to a design drawing and is provided with a plastic sleeve; deoiling the anchoring section to enhance the bonding force between the anchor cable (2) and mortar;

3) the anchor beam is a direct stress component stretched by the anchor cable (2), and the bearing surface of the pad is kept flat and is vertical to the axial direction of the anchor cable (2).

6. The anchor cable construction method of the steel sheet pile slope protection area as claimed in claim 3, wherein: in the construction step S430, the installation considerations for the anchor cable (2) are as follows;

1) checking and positioning the positions of the grout stopping ring and the grout limiting ring, and replacing the damaged grout stopping ring and the damaged grout limiting ring according to the technical requirements;

2) checking the position and the unobstructed condition of the exhaust pipe:

3) the anchor cable (2) is fed into the mounting hole, pushing is stopped when the positioning grout stopping ring reaches the orifice, and a grouting pipe and a one-way valve are mounted;

4) and after the anchor cable (2) is in place, checking whether the exhaust pipe is unobstructed again, if not, pulling out the anchor cable (2), and sending the cable again after the fault is eliminated.

7. The anchor cable construction method of the steel sheet pile slope protection area as claimed in claim 3, wherein: in the construction step S410, the construction measurement steps are as follows:

s411: paying off measurement, wherein a measurer rechecks the slope gradient according to a design drawing, strictly measures the position, the distance and the size of the crown beam (5), and alternately pays off the slope surface by using a cotton rope;

s412: according to the design specification of the crown beam (5), the mounting hole position of the anchor rod or the anchor cable (2) is accurately measured and placed on the slope surface, and the anchor rod or the anchor cable is numbered and marked by a lime line.

8. The anchor cable construction method of the steel sheet pile slope protection area as claimed in claim 1, characterized in that: envelope (1) sets up in the ground foundation ditch of domatic adjacent department, it carries out the bank protection to set up steel sheet stub (3) on the side slope more than envelope (1) top surface, still when constructing anchor rope (2) in steel sheet pile anchor section depth range simultaneously, adopt long short steel sheet pile interval arrangement's mode, arrange steel sheet stub (3) in anchor rope (2) top soil slope position after anchor rope (2) installation construction is accomplished, other positions that do not influence anchor rope (2) adopt steel sheet long pile (4) to beat into the soil in vivo, anchor rope (2) extend to the outside anchor head of mounting hole and arrange in order the back, and erect steel reinforcement cage and template, pour crown beam (5) in the anchor head department of anchor rope (2).

9. The anchor cable construction method of the steel sheet pile slope protection area as claimed in claim 8, wherein: anchor rope (2) include anchor section and free section, and extend to the outside tensile end that exposes of mounting hole, the length that exposes tensile end is 1.5m at least, anchor rope (2) are the component of being worked out by 3 at least the same steel strand wires (21), and steel strand wires (21) adopt iron wire (22) to bind every 1m, it has cup jointed anticorrosive sleeve pipe (23) on the free section outer wall, anticorrosive sleeve pipe (23) are the component that plastic materials made, its both ends are sealed, evenly be provided with locating support (24) on the inner wall of anticorrosive sleeve pipe (23), the other end of locating support (24) sets up on the outer wall of steel strand wires (21), and pour into in the anticorrosive sleeve pipe (23) in the steel strand wires (21) outside and have butter (25).

Technical Field

The invention relates to the technical field of anchor cable construction after steel sheet pile slope protection in foundation pit engineering, in particular to an anchor cable construction method in a steel sheet pile slope protection area.

Background

The building enclosure and the prestressed anchor cable are common supporting structures in the field of civil engineering, and are particularly common in side slope and foundation pit supporting. Under the condition that certain conditions are limited by fields or influenced by surrounding environments, slope protection needs to be carried out on the side slope above the top surface of the supporting structure by adopting steel sheet piles, and then construction of the foundation pit support structure and the anchor cable is carried out. In order to ensure the safety and stability of the slope protection of the steel sheet pile, the steel sheet pile needs to be inserted into a soil layer to a certain depth, so that the anchoring depth of the steel sheet pile always influences the construction of the anchor cable.

If the influence of the steel sheet pile is avoided, the conventional construction process comprises the following steps: firstly constructing anchor cables, then constructing crown beams, then constructing soil retaining plates, and then backfilling soil bodies behind the plates. After the influence of the steel sheet piles, the construction of the top beam is forced to be carried out, holes for anchor cable construction are reserved in the top beam to facilitate later anchor cable construction, then soil retaining plates are constructed, soil at the back of the plates is backfilled, then the steel sheet piles are pulled out, and finally anchor cable construction and tensioning are carried out through the holes reserved in the top beam. In order to meet the construction requirements of the anchor cable drilling machine drill bit, the reserved hole on the crown beam is much larger than the normally pre-buried anchor cable pipeline, and the overall rigidity of the crown beam is greatly influenced. In addition, the anchor cable is influenced by the crown beam during construction, so that the construction efficiency is reduced. Under the condition, the construction difficulty of the crown beam and the anchor cable is increased, the construction period of the crown beam is prolonged, and the rigidity of the crown beam is influenced to a certain extent due to the increase of the reserved holes.

Therefore, a construction method of the anchor cable in the steel sheet pile slope protection area is provided.

Disclosure of Invention

The invention aims to provide an anchor cable construction method for a steel sheet pile slope protection area, and aims to solve the problems that in the background technology, the construction sequence is optimized, the construction process is more consistent with the conventional construction habit, the construction smoothness is ensured, and the influence of the prior construction of a crown beam on the construction difficulty of the anchor cable and the influence on the rigidity of the crown beam are avoided.

In order to achieve the purpose, the invention provides the following technical scheme: the anchor cable construction method for the steel sheet pile slope protection area comprises the following construction steps:

s1: construction preparation, namely, firmly constructing a foundation for the anchor cable;

s2: constructing a foundation pit support structure, a steel plate short pile and a steel plate long pile on the ground, determining the construction position of an anchor cable during construction, and adopting the steel plate short pile as the steel plate pile at the position;

s3: excavating a soil body to reach the elevation of the pile top;

s4: after cleaning the pile head, performing anchor cable construction, ensuring the position accuracy during the anchor cable construction, wherein the construction anchor cable hole is just below the short steel plate pile, and avoiding the long steel plate pile;

s5: after the construction of the anchor cable is finished, performing crown beam construction, and after the strength of the anchor cable meets the requirement, erecting a reinforcement cage and a template at the exposed end of the anchor cable to pour the crown beam;

s6: after the strength of the crown beam and the anchor cable meets the requirement, backfilling a soil body behind the crown beam, and then tensioning and locking the anchor cable;

s7: continuing to excavate the soil body in the pit, constructing a basement structure after excavating to the bottom of the pit, and backfilling the soil body to the ground after the basement structure is constructed out of the ground;

s8: and after the soil body is backfilled, pulling out the steel sheet pile for recycling.

Further, for the construction preparation in the construction step S1, the construction implementation steps are as follows:

s101: before starting work, related technicians should be organized to carefully learn the design of the implementation construction organization, read and examine construction drawings, clarify related technical problems and be familiar with specifications and technical standards;

s102: according to the technical meeting bottom standard requirements, technical meeting bottom is compiled, technical meeting bottom is carried out on constructors, pre-post technical training is carried out on the constructors involved, and post-post is certified after the assessment is qualified;

s103: construction safety guarantee measures and emergency plans should be formulated.

Further, for the anchor cable construction in the construction step S4, the construction steps are as follows:

s410: cleaning the slope surface to ensure the tamping flatness of the slope protection surface, and then performing construction measurement on the slope surface to determine construction hole sites of the anchor cables;

s420: drilling an installation hole of the anchor cable by using a drilling machine, and blowing chips and cleaning the hole by using high-pressure air;

s430: after the anchor cable holes are cleaned, the anchor cable can be manufactured on site, or the anchor cable can be manufactured in advance according to the design requirement, and the manufactured anchor cable is installed in the installation holes;

s440: after the anchor cable is installed, concrete mortar is manufactured on site, the concrete mortar is poured into an installation hole of the anchor cable, hole bottom grouting construction is adopted for anchor cable grouting, the mortar is poured from the hole bottom, and air is exhausted from an exhaust hole;

s450: after the mortar is poured, tensioning the anchor cable after the grouting and the anchor beam concrete reach 70% of the design strength, calibrating tensioning equipment before tensioning the anchor cable, and treating the anchor head after tensioning.

Further, the anchor cable is tensioned and pulled step by step twice, the first tensioning is 70 percent of the total tensioning force, and the interval time between the two times of tensioning is preferably not less than 3 to 5 days; in order to reduce the prestress loss, the total tension force should include an over-tension value, preferably 15-25% when the free section is a soil layer, and preferably 10-15% when the free section is a rock layer.

Further, the anchor cable construction considerations are as follows:

1) the hole forming error is strictly controlled in the drilling process, the inclination angle and the horizontal angle error are controlled to be below 1 degree, the hole inclination deviation is less than 2 percent, rock strata around the drilled hole are not disturbed as much as possible, and the hole is continuously blown for at least 10min from the bottom of the drilled hole to the outside after the drilling is finished;

2) when the anchor cable is manufactured, the anchor cable is prevented from being twisted and bent so as to reduce the generation of secondary stress as much as possible; carefully performing corrosion prevention on the free section of the anchor cable, and adding the plastic sleeve with the anticorrosive oil according to a design drawing; deoiling the anchoring section to enhance the adhesion between the anchor cable and mortar;

3) the anchor beam is a direct stress component for tensioning the anchor cable, and the bearing surface of the pad is kept flat and is vertical to the axial direction of the anchor cable.

Further, in the construction step S430, the anchor cable installation considerations are as follows;

1) checking and positioning the positions of the grout stopping ring and the grout limiting ring, and replacing the damaged grout stopping ring and the damaged grout limiting ring according to the technical requirements;

2) checking the position and the unobstructed condition of the exhaust pipe:

3) the anchor cable is fed into the mounting hole, pushing is stopped when the positioning grout stopping ring reaches the orifice, and the grouting pipe and the one-way valve are mounted;

4) and after the anchor cable is in place, checking whether the exhaust pipe is unobstructed once, if not, pulling out the anchor cable, and sending the cable again after the fault is eliminated.

Further, in the construction step S410, the construction measurement steps are as follows:

s411: paying off, namely rechecking the slope gradient according to a design drawing by a measurer, strictly measuring the position, the distance and the size of the crown beam 5, and alternately paying off the slope surface by using a cotton rope;

s412: accurately measuring the mounting hole positions of the anchor rods or the anchor cables on the slope according to the design specification of the crown beams, numbering the mounting hole positions, and marking the mounting hole positions by using lime lines;

further, the enclosure structure is arranged in a ground foundation pit adjacent to the slope surface, steel short piles are arranged on a slope above the top surface of the enclosure structure for slope protection, meanwhile, when the anchor cable is constructed in the depth range of the anchoring section of the steel sheet piles, the long steel sheet piles and the short steel sheet piles are arranged at the position of the soil slope above the anchor cable in an interval arrangement mode, after the installation and construction of the anchor cable are completed, the steel short piles are arranged at the position of the soil slope above the anchor cable, other positions which do not affect the anchor cable are driven into the soil body by the long steel sheet piles, the anchor cable extends to the anchor head outside the mounting hole for arrangement, a steel reinforcement cage and a template are erected, and the top beam is poured at the anchor head of the anchor cable.

Furthermore, the anchor cable comprises an anchoring section and a free section, and an exposed stretching end extending to the outside of the mounting hole, wherein the length of the exposed stretching end is at least 1.5m, the anchor cable is a component woven by at least identical steel strands, the steel strands are bound by iron wires every 1m, an anti-corrosion sleeve is sleeved on the outer wall of the free section, the anti-corrosion sleeve is a component made of plastic materials, the two ends of the anti-corrosion sleeve are sealed, a positioning support is uniformly arranged on the inner wall of the anti-corrosion sleeve, the other end of the positioning support is arranged on the outer wall of each steel strand, and grease is injected into the anti-corrosion sleeve on the outer side of each steel strand.

The invention provides an anchor cable construction method of a steel sheet pile slope protection area, a building protective structure is arranged in a ground foundation pit at the adjacent position of a slope surface, short steel sheet piles are arranged on a side slope above the top surface of the building protective structure for slope protection, meanwhile, when an anchor cable is constructed within the depth range of an anchor section of the steel sheet pile, a mode of arranging long and short steel sheet piles at intervals is adopted, after the installation and construction of the anchor cable are finished, the short steel sheet piles are arranged at the position of a soil slope above the anchor cable, other positions which do not influence the anchor cable are driven into the soil by the long steel sheet piles, after the anchor cable extends to an anchor head outside an installation hole for arrangement, a steel reinforcement cage is connected and a template is erected, a beam is poured at the anchor head of the anchor cable, the construction sequence is optimized, the construction procedure is more in line with the conventional construction habit, the construction smoothness is ensured, the influence of the steel sheet piles on the construction is avoided, by arranging the short steel sheet piles, under the condition of ensuring the stability of the side slope, the influence of the steel sheet pile on the construction of the anchor cable is completely avoided.

Drawings

FIG. 1 is a schematic diagram of the overall construction process of the anchor cable construction method for the steel sheet pile slope protection area;

FIG. 2 is a schematic view of an anchor cable installation structure of the anchor cable construction method for the steel sheet pile slope protection area of the invention;

FIG. 3 is a construction preparation flow chart of the anchor cable construction method of the steel sheet pile slope protection area of the invention;

FIG. 4 is a schematic diagram of anchor cable construction considerations in the anchor cable construction method for the steel sheet pile slope protection area according to the present invention;

FIG. 5 is an anchor cable installation flow chart of the anchor cable construction method for the steel sheet pile slope protection area of the invention;

FIG. 6 is an anchor cable installation construction measurement flow chart of the anchor cable construction method for the steel sheet pile slope protection area of the invention;

FIG. 7 is a schematic view of the anchor cable installation considerations of the anchor cable construction method for the steel sheet pile slope protection area of the present invention;

fig. 8 is a schematic view of a local structure of an anchor cable in the steel sheet pile slope protection area anchor cable construction method of the present invention.

In the figure: 1. an enclosure structure; 2. an anchor cable; 21. steel strand wires; 22. iron wires; 23. an anti-corrosion sleeve; 24. positioning the bracket; 25. butter; 3. short steel plate piles; 4. long steel plate piles; 5. a crown beam.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and 3, the anchor cable construction method for the steel sheet pile slope protection area includes the following construction steps:

the method comprises the following steps: construction preparation, namely, firmly constructing a foundation for the anchor cable 2;

step two: constructing a foundation pit support structure 1, a steel plate short pile 3 and a steel plate long pile 4 on the ground, determining the construction position of an anchor cable 2 during construction, and adopting the steel plate short pile 3 as the steel plate pile at the position;

step three: excavating a soil body to reach the elevation of the pile top;

step four: after cleaning the pile head, performing anchor cable 2 construction, ensuring the position accuracy when constructing the anchor cable 2, and avoiding the long steel plate pile 4 because the constructed anchor cable hole is just below the short steel plate pile 3;

step five: after the construction of the anchor cable 2 is finished, the construction of the crown beam 5 is carried out, after the strength of the anchor cable 2 meets the requirement, a reinforcement cage and a template are erected at the exposed end of the anchor cable 2 for pouring the crown beam 5, so that the influence of the hole on the rigidity of the crown beam 5 is reduced, the reserved hole of the crown beam 5 is consistent with the hole of the commonly used anchor cable 2, the diameter of the hole is reduced, the influence on the rigidity of the crown beam 5 is reduced, and the safety of the enclosure structure 1 is ensured;

step six: after the strength of the crown beam 5 and the anchor cable 2 meets the requirement, backfilling the soil body behind the crown beam 5, and then tensioning and locking the anchor cable 2;

step seven: continuing to excavate the soil body in the pit, constructing a basement structure after excavating to the bottom of the pit, and backfilling the soil body to the ground after the basement structure is constructed out of the ground;

step eight: after the soil body is backfilled, the steel sheet piles are pulled out and recycled, so that the construction difficulty is reduced, the reserved holes of the anchor cable 2 are reduced, the influence on the arrangement of the tube beam steel bars is avoided, and the influence of the crown beam 5 on the drilling construction of the anchor cable 2 drilling machine is also avoided; the construction period is shortened, the whole construction process is smoother, and the construction progress is accelerated.

Aiming at the construction preparation in the first construction step, the construction implementation steps are as follows:

s101: before starting work, related technicians should be organized to carefully learn the design of the implementation construction organization, read and examine construction drawings, clarify related technical problems and be familiar with specifications and technical standards;

s102: according to the technical meeting bottom standard requirements, technical meeting bottom is compiled, technical meeting bottom is carried out on constructors, pre-post technical training is carried out on the constructors involved, and post-post is certified after the assessment is qualified;

s103: construction safety guarantee measures and emergency plans should be formulated.

Referring to fig. 1 and 5, the anchor cable 2 in the fourth construction step is constructed according to the following steps:

s410: cleaning the slope surface to ensure the tamping flatness of the slope protection surface, and then performing construction measurement on the slope surface to determine the construction hole site of the anchor cable 2;

s420: drilling the mounting hole of the anchor cable 2 by using a drilling machine, and blowing chips and cleaning the hole by using high-pressure air;

s430: after the hole cleaning of the anchor cable 2 is finished, the anchor cable 2 can be manufactured on site, or the manufacture of the anchor cable 2 can be finished in advance according to the design requirement, and the manufactured anchor cable 2 is installed in the installation hole;

s440: after the anchor cable 2 is installed, concrete mortar is manufactured on site, the concrete mortar is poured into the installation hole of the anchor cable 2, the grouting of the anchor cable 2 adopts hole bottom grouting construction, the mortar is injected from the hole bottom, and air is exhausted from the exhaust hole;

s450: after the mortar is poured, tensioning the anchor cable 2 is carried out after the grouting and the anchor beam concrete reach 70% of the design strength, calibrating tensioning equipment before tensioning the anchor cable 2, and treating an anchor head after tensioning is finished.

Tensioning the anchor cable 2 by two times step by step, wherein the first tensioning is 70 percent of the total tensioning force, and the interval time between the two times of tensioning is preferably not less than 3-5 days; in order to reduce the prestress loss, the total tension force should include an over-tension value, preferably 15-25% when the free section is a soil layer, and preferably 10-15% when the free section is a rock layer.

Referring to fig. 1 and 4, the anchor cable 2 is constructed as follows:

1) the hole forming error is strictly controlled in the drilling process, the inclination angle and the horizontal angle error are controlled to be below 1 degree, the hole inclination deviation is less than 2 percent, rock strata around the drilled hole are not disturbed as much as possible, and the hole is continuously blown for at least 10min from the bottom of the drilled hole to the outside after the drilling is finished;

2) when the anchor cable 2 is manufactured, the anchor cable 2 is prevented from being twisted and bent, so that the generation of secondary stress is reduced as much as possible; carefully making the corrosion prevention of the free section of the anchor cable 2, adding the anti-corrosion oil according to a design drawing and adding a plastic sleeve; deoiling the anchoring section to enhance the bonding force between the anchor cable 2 and mortar;

3) the anchor beam is a direct stress component stretched by the anchor cable 2, and the bearing surface of the pad is kept flat and is vertical to the axial direction of the anchor cable 2.

Referring to fig. 5, 6 and 7, in the construction step S430, the installation considerations of the anchor cable 2 are as follows;

1) checking and positioning the positions of the grout stopping ring and the grout limiting ring, and replacing the damaged grout stopping ring and the damaged grout limiting ring according to the technical requirements;

2) checking the position and the unobstructed condition of the exhaust pipe:

3) the anchor cable 2 is fed into the mounting hole, pushing is stopped when the positioning grout stopping ring reaches the orifice, and a grouting pipe and a one-way valve are mounted;

4) and after the anchor cable 2 is in place, checking whether the exhaust pipe is unobstructed once again, if not, pulling out the anchor cable 2, and sending the cable again after the fault is eliminated.

In the construction step S410, the construction measurement steps are as follows:

s411: paying off, namely rechecking the slope gradient according to a design drawing by a measurer, strictly measuring the position, the distance and the size of the crown beam 5, and alternately paying off the slope surface by using a cotton rope;

s412: accurately measuring and placing the mounting hole positions of the anchor rods or the anchor cables 2 on the slope according to the design specification of the crown beams 5, numbering the mounting hole positions, and marking the mounting hole positions by using lime lines;

referring to fig. 2 and 8, the enclosure structure 1 is arranged in a ground foundation pit adjacent to a slope surface, short steel sheet piles 3 are arranged on the slope above the top surface of the enclosure structure 1 for slope protection, meanwhile, when anchor cables 2 are constructed within the depth range of the anchoring section of the steel sheet piles, the short steel sheet piles 3 are arranged at intervals, after the installation and construction of the anchor cables 2 are completed, the short steel sheet piles 3 are arranged at the soil slope position above the anchor cables 2, other positions which do not affect the anchor cables 2 are driven into the soil by the long steel sheet piles 4, the anchor heads of the anchor cables 2 extending to the outside of the installation holes are arranged, a steel reinforcement cage and a template are erected, crown beams 5 are poured at the anchor heads of the anchor cables 2, the construction sequence is optimized, the construction process is more in line with the conventional construction habit, the construction smoothness of the construction is ensured, the influence of the steel sheet piles on the construction of the anchor cables is avoided, by arranging the short steel sheet piles, under the condition of ensuring the stable slope, the influence of the steel sheet pile on the construction of the anchor cable is completely avoided.

The anchor rope 2 comprises an anchoring section and a free section, and an exposed tensioning end extending to the outside of the mounting hole, the length of the exposed tensioning end is at least 1.5m, the anchor rope 2 is a component woven by at least 3 identical steel strands 21, the steel strands 21 are bound by iron wires 22 every 1m, an anti-corrosion sleeve 23 is sleeved on the outer wall of the free section, the anti-corrosion sleeve 23 is a component made of plastic materials, the two ends of the anti-corrosion sleeve are sealed, a positioning support 24 is uniformly arranged on the inner wall of the anti-corrosion sleeve 23, the other end of the positioning support 24 is arranged on the outer wall of the steel strand 21, and grease 25 is injected into the anti-corrosion sleeve 23 outside the steel strand 21.

The working principle is as follows: building envelope 1 sets up in the ground foundation ditch of domatic adjacent department, it carries out the bank protection to set up steel sheet stub 3 on the slope more than building envelope 1 top surface, still when constructing anchor rope 2 in steel sheet pile anchor section depth range simultaneously, adopt the mode of long short steel sheet pile interval arrangement, arrange steel sheet stub 3 in anchor rope 2 top soil slope position after anchor rope 2 installation construction is accomplished, other positions that do not influence anchor rope 2 adopt steel sheet long pile 4 to beat into the soil body, anchor rope 2 extends to the outside anchor head of mounting hole and arranges the back, connect the steel reinforcement cage and erect the template, crown beam 5 is pour to the anchor head department at anchor rope 2, the construction order has been optimized, make the construction process more accord with conventional construction custom, the smoothness nature of construction has been guaranteed.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention provides a construction method of an anchor cable in a slope protection area of a steel sheet pile, which is characterized in that a building envelope 1 is arranged in a ground foundation pit at the adjacent position of a slope surface, short steel sheet piles 3 are arranged on a side slope above the top surface of the building envelope 1 for slope protection, meanwhile, when an anchor cable 2 is constructed within the depth range of an anchoring section of the steel sheet pile, a long steel sheet pile and a short steel sheet pile are arranged at intervals, after the installation construction of the anchor cable 2 is finished, the short steel sheet piles 3 are arranged at the position of the soil slope above the anchor cable 2, other positions which do not influence the anchor cable 2 are driven into the soil by using long steel sheet piles 4, after the anchor head of the anchor cable 2 extending to the outside of an installation hole is finished, a steel reinforcement cage is connected and a template is erected, a crown beam 5 is poured at the anchor head of the anchor cable 2, the construction sequence is optimized, the construction process is more in line with the conventional construction habit, the construction smoothness of the construction of the anchor cable is ensured, the influence of the steel sheet pile on the construction is avoided, by arranging the short steel sheet pile, under the condition of ensuring the stability of the side slope, the influence of the steel sheet pile on the construction of the anchor cable is completely avoided.

2. According to the anchor cable construction method for the steel sheet pile slope protection area, after the anchor heads of the anchor cables 2 extending to the outside of the installation holes are arranged, the steel reinforcement cages are connected, the templates are erected, the crown beams 5 are poured at the anchor heads of the anchor cables 2, the influence of the holes on the rigidity of the crown beams 5 is reduced, the reserved holes of the crown beams 5 are consistent with the holes of the commonly used anchor cables 2, the diameter of the holes is reduced, the influence on the rigidity of the crown beams 5 is reduced, and the safety of the enclosure structure 1 is guaranteed.

3. According to the anchor cable construction method for the steel sheet pile slope protection area, which is provided by the invention, the construction difficulty is reduced, the reserved holes of the anchor cable 2 are reduced, the influence on the arrangement of the tube beam reinforcing steel bars is avoided, and the influence of the crown beam 5 on the drilling construction of the anchor cable 2 drilling machine is also avoided; the construction period is shortened, the whole construction process is smoother, and the construction progress is accelerated.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.