CN111236244A - Method for treating water leakage of free section of anchor cable on sand layer of foundation pit - Google Patents
Method for treating water leakage of free section of anchor cable on sand layer of foundation pit Download PDFInfo
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- CN111236244A CN111236244A CN202010019651.0A CN202010019651A CN111236244A CN 111236244 A CN111236244 A CN 111236244A CN 202010019651 A CN202010019651 A CN 202010019651A CN 111236244 A CN111236244 A CN 111236244A
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- anchor cable
- grouting
- foundation pit
- free section
- water leakage
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- 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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- 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
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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- 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
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- General Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of foundation pit support, and discloses a method for treating water leakage of a free section of an anchor cable on a sand layer of a foundation pit, which comprises the following steps: drilling anchor cable holes in the side wall of the foundation pit; arranging a primary grouting pipe and a secondary grouting pipe on the anchor cable, and lowering the anchor cable into the anchor cable hole; the anchor cable comprises a free section and an anchoring section, wherein the periphery of the free section is wound with impermeable fillers, when the anchor cable is placed in the anchor cable hole, the anchoring section is completely placed in the anchor cable hole, the lower part of the free section is placed in the anchor cable hole, and the upper part of the free section is placed outside the anchor cable hole; carrying out primary grouting and secondary grouting; after the slurry is solidified, the anchor cable and the support pile are tensioned and fixed through the fixing structure; the seepage-proof filler is wound on the free section of the anchor cable and attached to the side wall of the anchor cable hole, so that the seepage-proof filler is combined with the anchor cable hole more tightly, the slurry is attached to the periphery of the seepage-proof filler, and an integrally arranged seepage-proof layer is formed between the slurry and the seepage-proof filler, so that a better waterproof and seepage-proof effect can be achieved.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting, in particular to a method for treating water leakage of a free section of an anchor cable on a sand layer of a foundation pit.
Background
At present, with the rapid development of urban construction, deep foundation pit supporting projects are more and more, and due to the advantages of high economic superiority, high construction efficiency and the like of a pile-anchor supporting structural form, the pile-anchor supporting structure is more and more used in the foundation pit supporting projects.
However, the common problem of water leakage at the position of the bellows at the free section of the rear edge after the anchor cable is tensioned and locked in the sand layer of the deep foundation pit is not solved well all the time, and the continuous water leakage will inevitably cause the underground water level at the periphery of the foundation pit to be reduced, so that the settlement of roads, pipelines and buildings (structures) in the influence range of the foundation pit is increased, even exceeds the standard, and the potential safety hazard is brought to the foundation pit.
In the prior art, methods such as slurry plugging are generally adopted, but the anti-seepage effect of the methods is limited, and the problem that the plugging of the anchor cable hole with serious water leakage cannot achieve a good anti-seepage effect exists.
Disclosure of Invention
The invention aims to provide a method for treating water leakage of a free section of an anchor cable of a sand layer of a foundation pit, and aims to solve the problem that the plugging of an anchor cable hole with serious water leakage cannot have a good anti-leakage effect in the prior art.
The invention relates to a method for treating water leakage of a free section of an anchor cable of a sand layer of a foundation pit, which comprises the following construction steps:
1) drilling anchor cable holes in the side wall of the foundation pit;
2) arranging a primary grouting pipe and a secondary grouting pipe on the anchor cable, and lowering the anchor cable into the anchor cable hole;
3) the anchor cable comprises a free section and an anchoring section, impermeable fillers are wound on the periphery of the free section, when the anchor cable is placed in the anchor cable hole, the anchoring section is completely placed in the anchor cable hole, the lower part of the free section is placed in the anchor cable hole, and the upper part of the free section is placed outside the anchor cable hole;
4) performing primary grouting by using the primary grouting pipe;
5) after the primary grouting is finished, performing secondary grouting by using the secondary grouting pipe until grout overflows from the orifice of the anchor cable hole, and stopping grouting;
6) a fixing structure is arranged at the upper part of the free section, and after the slurry is solidified, the anchor cable and the support pile are tensioned and fixed through the fixing structure;
7) and finishing the construction.
Further, in the step 2), when the anchor cable is lowered, the end of the secondary grouting pipe is fixed to the bottom end of the anchoring section, and the secondary grouting pipe is lowered to the bottom of the anchor cable hole along with lowering of the anchor cable.
Further, in step 3), when the bottom end of the anchoring section is lowered to the bottom of the anchor cable hole, grouting is performed into the anchor cable hole through the primary grouting pipe, when grout overflows from the orifice of the anchor cable hole, grouting is stopped, the anchor cable is pulled out by 0.25m in the direction away from the bottom of the hole, and grouting is continued.
Further, in the step 4), a plurality of drill holes are drilled in the fixed structure along the direction towards the side wall of the foundation pit, the drill holes are arranged around the end head of the free end of the anchor cable in a surrounding mode, a plurality of grouting steel pipes which face different directions and are embedded in the soil body of the side wall of the foundation pit are drilled into the drill holes, and a pipe body of each grouting steel pipe is provided with a plurality of drill holes.
Further, in step 4), after the primary grouting is completed, grouting is performed into the grouting steel pipe until the grout leaks out from the orifice of the grouting steel pipe, and the steel pipe orifice of the grouting steel pipe is blocked by the grout prepared by using the curing agent after the grouting is completed.
Further, in the step 5), the fixing structure is a waist beam, the waist beam is fixed on the support pile, the anchoring section of the anchor cable penetrates through the waist beam and is anchored and tensioned through an anchorage device, and if water leakage from the waist beam occurs, holes are drilled around the water leakage point of the waist beam and are filled with grouting quick-setting grouting material.
Furthermore, the waist rail is arranged on one side, far away from the side wall of the foundation pit, of the support pile, a plurality of anchor bars are built in the support pile in advance, the anchor bars extend out of the support pile and penetrate through the support pile, and grout is poured into gaps among the anchor bars, the waist rail and the support pile through a high-pressure pouring machine.
Furthermore, three steel strands are bound on the periphery of the primary grouting pipe to form the anchor cable, and a plurality of binding groups are bound on the peripheries of the three steel strands along the length direction of the steel strands and are uniformly arranged at intervals.
Further, install a plurality of support framves on the anchor rope, the periphery of support frame is sunken inward and forms the depressed groove, will be three the steel strand wires embedding is in the depressed groove, follow the cross section direction of anchor rope, it is three the steel strand wires are equilateral triangle and arrange, slip casting pipe through-hole arranges threely the middle part of steel strand wires through-hole follows the length direction of steel strand wires, it is a plurality of the support frame is even interval arrangement, the support frame with tie up the group staggered arrangement.
Furthermore, the primary grouting pipe penetrates through the center of the support frame, and the secondary grouting pipe penetrates through the edge of the support frame.
Compared with the prior art, the method for treating the water leakage at the free section of the anchor cable of the foundation pit sand layer, provided by the invention, has the advantages that the impermeable filler is wound at the free section of the anchor cable, the impermeable filler is attached to the side wall of the anchor cable hole, the anchor cable hole is more tightly combined with the anchor cable hole, the grout is attached to the periphery of the impermeable filler through primary pouring and secondary pouring, and after the grout is solidified, the integrally arranged impermeable layer is formed between the grout and the impermeable filler, so that a better waterproof and impermeable effect can be achieved.
Drawings
FIG. 1 is a flow chart of construction steps of a method for treating water leakage at a free section of an anchor cable of a sand layer of a foundation pit, provided by the invention;
FIG. 2 is a schematic perspective view of grouting for the method for treating water leakage at a free section of an anchor cable in a sand layer of a foundation pit according to the present invention;
FIG. 3 is a front view of a grouting drilling position in the treatment method for water leakage at a free section of an anchor cable of a sand layer of a foundation pit according to the present invention;
FIG. 4 is a sectional view of grouting in the method for treating water leakage at a free section of an anchor cable in a sand layer of a foundation pit according to the present invention;
FIG. 5 is a schematic cross-sectional view of a section 1-1 in the method for treating water leakage at a free section of an anchor cable in a sand layer of a foundation pit according to the present invention;
FIG. 6 is a schematic cross-sectional view of a 2-2 cross-section in the method for treating water leakage at a free section of an anchor cable in a sand layer of a foundation pit according to the present invention;
FIG. 7 is a schematic cross-sectional view of a section 3-3 of the method for treating water leakage at a free section of an anchor cable in a sand layer of a foundation pit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1 to 7, preferred embodiments of the present invention are shown.
The method for treating the water leakage of the free section of the anchor cable on the sand layer of the foundation pit comprises the following construction steps:
1) drilling anchor cable holes 70 on the side wall of the foundation pit;
2) arranging a primary grouting pipe and a secondary grouting pipe on the anchor cable 10, and lowering the anchor cable 10 into the anchor cable hole 70;
3) the anchor cable 10 comprises a free section 1010 and an anchoring section 1011, the outer periphery of the free section 1010 is wound with the impermeable filler 30, when the anchor cable 10 is placed in the anchor cable hole 70, the anchoring section 1011 is completely placed in the anchor cable hole 70, the lower part of the free section 1010 is placed in the anchor cable hole 70, and the upper part of the free section 1010 is placed outside the anchor cable hole 70;
4) performing primary grouting by using the primary grouting pipe 120;
5) after the primary grouting is finished, performing secondary grouting by using the secondary grouting pipe 130 until grout overflows from the orifice of the anchor cable hole 70, and stopping grouting;
6) a fixing structure is arranged at the upper part of the free section 1010, and after the slurry is solidified, the anchor cable 10 is tensioned and fixed with the support pile 20 through the fixing structure;
7) and finishing the construction.
According to the method for treating the water leakage at the free section 1010 of the anchor cable 10 of the foundation pit sand layer, the impermeable filler 30 is wound on the free section 1010 of the anchor cable 10, the impermeable filler 30 is attached to the side wall of the anchor cable hole 70 and is combined with the anchor cable hole 70 more tightly, the grout is attached to the periphery of the impermeable filler 30 through primary pouring and secondary pouring, and after the grout is solidified, an integrally arranged impermeable layer is formed between the grout and the impermeable filler 30, so that a better waterproof and impermeable effect can be achieved.
The sealing film is wound on the periphery of the anti-seepage filler 30, and the anti-seepage filler 30 is kept in a tight state by vacuumizing, so that the anti-seepage filler is convenient to install and fix, and meanwhile, a good waterproof effect can be achieved.
The material of the sealing film can be a plastic film or an elastic rubber film.
Before the foundation pit is dug, the support piles 20 are driven in firstly, then the support piles are dug out downwards along the support piles 20 from the top 91 of the foundation pit until the bottom 90 of the foundation pit is dug, and at the moment, the lower ends of the support piles 20 are inserted below the foundation pit.
The anti-seepage filler 30 can be made of waste fibers on a construction site, so that on one hand, waste on the construction site can be recycled, and on the other hand, the construction cost can be reduced.
On the other hand, the free section 1010 has an upper portion distant from the anchor section 1011 and a lower portion contacting the anchor section 1011, and when the impermeable filler 30 is wound, the winding is started from the lower portion of the free section 1010 in the upper direction, and the diameter of the lower portion of the free section 1010 after the winding is completed is the same as the diameter of the anchor cable hole 70 in terms of the winding thickness.
The winding length is 1m or more.
The thickness of the wound impermeable filler 30 is gradually increased along the direction from the rear end of the free section 1010 to the front end of the free section 1010, so that when the anchor cable 10 is laid down, the free section 1010 slowly enters the anchor cable hole 70, the free section 1010 is tightly attached to the inner wall of the anchor cable hole 70, and tightness between the anchor cable 10 and the anchor cable hole 70 is guaranteed in the construction process.
In step 2), when the anchor cable 10 is lowered, the end of the secondary grouting pipe 130 is fixed to the bottom end of the anchoring section 1011, and the secondary grouting pipe 130 is lowered to the bottom of the anchor cable hole 70 along with the lowering of the anchor cable 10.
In step 3), when the bottom end of the anchoring section 1011 is lowered to the bottom of the anchor cable hole 70, grouting is performed into the anchor cable hole 70 through the primary grouting pipe 120, when grout overflows from the orifice of the anchor cable hole 70, grouting is stopped, and the anchor cable 10 is pulled out 0.25m in the direction away from the hole bottom, and grouting is continued.
Specifically, the bottom of the primary grouting pipe 120 is provided with a grouting opening, during grouting, grout directly flows into the bottom of the anchor cable hole 70 through the primary grouting pipe 120, and gradually rises along with continuous accumulation of the grout until the grout reaches the impermeable filler 30 and is soaked in the impermeable filler 30, and grouting can be stopped when the grout overflows from the outlet of the anchor cable hole 70.
The slurry is injected from bottom to top, and can be slowly accumulated from bottom to top, so that the gap in the drilling hole can be more comprehensively filled without leaving gaps and bubbles, and a better filling effect is achieved.
After primary grouting is completed, because the grout has the interference of bubbles or anchor cable 10 and the like, it is very likely that the grouting is uneven or gaps which are not grouted still exist, thereby the grouting effect is influenced, even a water leakage path is provided for the outside, therefore, after primary grouting is completed, secondary grouting is needed again, secondary grouting uses secondary grouting pipe 130, a plurality of open pores are formed around the pipe wall of secondary grouting pipe 130, and thus, through secondary grouting, the gap area which is not filled by primary grouting can be further filled, thereby the grout inside anchor cable hole 70 is more compact in grouting, the strength of the grout inside anchor cable hole 70 is enhanced, on one hand, the anchor cable 10 is more compact in fixing, on the other hand, the porosity inside of the grout is reduced, and a better waterproof effect can be achieved.
Before putting secondary slip casting pipe 130 down, a plurality of closing membranes are attached to the trompil on secondary slip casting pipe 130, and in the process of putting down, the closing membrane can realize the isolated effect between secondary slip casting pipe 130 and the soil body to avoid external soil body to enter into secondary slip casting pipe 130 through the trompil in, cause the problem such as jam to secondary slip casting pipe 130, in the filling process, under the drive of thick liquid pressure, the closing membrane breaks, and the thick liquid enters into anchor rope hole 70 by secondary slip casting pipe 130.
In step 4), a plurality of drill holes 102 are drilled in the fixed structure along the direction towards the side wall of the foundation pit, the drill holes 102 are arranged around the end of the free section 1010 of the anchor cable 10 in a surrounding mode, a plurality of grouting steel pipes 101 which face different directions and are embedded in soil on the side wall of the foundation pit are drilled into the drill holes 102, the pipe body of each grouting steel pipe 101 is provided with a plurality of drill holes, then grout is injected into the grouting steel pipe 101, the grout flows towards the surrounding soil through the drill holes of the grouting steel pipes 101, and after the grout is solidified, the grout is combined with the soil, namely, the anchor cable 10 can support the support piles 20 from multiple directions, the contact area between the anchor cable and the soil is increased, loose and broken soil layers near the hole can be glued into a whole, and the support piles 20 are fixed more stably.
In step 4), after primary grouting is completed, grouting is performed into the grouting steel pipe 101 until grout leaks out from the orifice of the grouting steel pipe 101, grouting is completed, the steel pipe orifice of the grouting steel pipe 101 is plugged by using grout prepared by using a curing agent, the orifice of the drilled hole 102 is sealed, no gap is left, and thus water can be prevented from permeating into the grouting steel pipe 101 from the orifice of the grouting steel pipe 101.
The length of the grouting steel pipe 101 is 3 m.
The grout used for the primary and secondary grouting is a grout, and the grout used for the steel pipe 101 for grouting is a grout prepared using a curing agent.
The curing agent comprises a high-efficiency structural agent and an additive, the high-efficiency structural agent and the additive are mixed with water to form cured slurry, the hollow pile section 300 is provided with waste slurry, and the cured slurry and high-pressure air are injected into the waste slurry together; the efficient structural agent accounts for 10-20% of the weight of the waste slurry, the water accounts for 10-20% of the weight of the waste slurry, the additive accounts for 0.5-1.5% of the weight of the waste slurry, and the efficient structural agent is used for curing the waste slurry and is supplemented with the additive to enhance the curing performance.
In the step 5), the fixing structure is a waist beam 40, the waist beam 40 is fixed on the support pile 20, the anchoring section 1011 of the anchor cable 10 penetrates through the waist beam 40 and is anchored and tensioned through an anchorage device 42, and if water leaks from the waist beam 40, holes are drilled around the water leakage point of the waist beam 40 and are filled with grouting quick-setting grouting material.
Specifically, the anchoring section 1011 of the anchor cable is firstly placed down in the anchor cable hole 70, the anchor cable is fixed in the anchor cable hole 70 through primary grouting and secondary grouting, the free section 1010 is placed outside the anchor cable hole 70 at this time, after the grout is solidified, the free section 1010 penetrates through the back of the waist beam 40, and then stretching and anchoring are performed through the anchor 70, at this time, as the thickness of the impermeable filler 30 wound at the front end of the rear end of the free section 1010 is gradually increased, the impermeable filler 30 can be more tightly attached and fixed with the waist beam 40 along with stretching of the anchor 70, and the tightness in the fixing process is increased.
A steel shim plate 43 is arranged below the anchorage 42.
The grouting fast-setting grouting material is a powdery grouting material compounded by water-soluble high-molecular polymer, surface active substances and the like, has strong dispersibility resistance and good fluidity, and realizes underwater self-leveling and self-compaction.
The wale 40 is arranged on one side of the support pile 20 far away from the side wall of the foundation pit, a plurality of anchor bars 44 are built in the support pile 20 in advance, the anchor bars 44 extend out of the support pile 20 and penetrate through the wale 40, and grout is poured into gaps among the anchor bars 44, the wale 40 and the support pile 20 through a high-pressure pouring machine.
The wale 40 is provided with a pressing surface which is arranged towards the support pile 20, the surface of the pressing surface is chiseled, namely the surface of the pressing surface is chiseled into a concave-convex uneven shape and is fixedly connected with the support pile 20 through an anchorage device 42, and at the moment, the pressing surface of the wale 40 is pressed against the outer surface of the support pile 20; after the fixation is completed, grout is injected between the abutting surface and the outer surface of the support pile 20 through a high-pressure filling machine.
The three steel strands 105 are bundled at the outer circumference of the primary grouting pipe 120 to form the anchor cable 10, and a plurality of bundling wire groups 300 are bundled at the outer circumference of the three steel strands 105 along the length direction of the steel strands 105, and the plurality of bundling wire groups 300 are arranged at regular intervals.
The outer periphery of the steel strand 105 is sleeved with a tendon sleeve 1051 which can play a role in corrosion prevention on the steel strand 105.
The primary grouting pipe 120 is made of a soft tubular material, the primary grouting pipe 120 is fixed in the middle of the three steel strands 105, and in the process of placing the steel strands 105 downwards, on one hand, the primary grouting pipe can be prevented from being interfered by soil layers, and the slurry flows more smoothly in the process, and on the other hand, the primary grouting pipe 120 can be guided and positioned in the process below.
The anchor cable 10 is provided with a plurality of support frames 310, the periphery of the support frames 310 is inwards recessed to form recessed grooves, the three steel strands 105 are embedded in the recessed grooves, along the cross section direction of the anchor cable 10, the three steel strands 105 are arranged in an equilateral triangle, the grouting pipe through holes are arranged in the middle of the through holes of the three steel strands 105, along the length direction of the steel strands 105, the plurality of support frames 310 are uniformly arranged at intervals, the support frames 310 and the bundling wire group 300 are arranged in a staggered manner, in this way, the length direction of the anchor cable 10 is arranged in a wide-narrow staggered manner, specifically, the width of the part of the anchor cable 10 with the support frames 310 is wide, the section of the part of the anchor cable 10 with the bundling wire group 300 is small, when the anti-seepage filler 30 is wound from the bundling wire group 300 to the direction of the support frames 310, the winding thickness of the bundling wire group 300 is based on the diameter after being wound being consistent with the diameter of the anchor cable hole 70, after being, and continuing to wind in the direction of the next bundling wire group 300 until the winding length meets the design requirement.
In the winding process, the thickness of the anchor cable 10 is not uniform, so that the anchor cable 10 can be combined with the impermeable filler 30 more firmly, the anchor cable 10 is not easy to slide, and the fixing effect is better.
The guide cap 107 is arranged at the bottom end of the anchor cable 10, the guide cap 107 is arranged in an inverted cone shape, and the anchor cable 10 can be pulled and guided in the process of putting down the anchor cable 10.
The primary grouting pipe 120 penetrates the center of the support frame 310, the primary grouting pipe 120 also penetrates the center of the strapping line group 300, and the secondary grouting pipe 130 penetrates the edge of the support frame 310, so that the coverage of primary grouting through the primary grouting pipe 120 and grouting through the secondary grouting pipe 130 is wider, and grout can be more fully poured into the anchor cable holes 70.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The method for treating the water leakage of the free section of the anchor cable on the sand layer of the foundation pit is characterized by comprising the following construction steps of:
1) drilling anchor cable holes in the side wall of the foundation pit;
2) arranging a primary grouting pipe and a secondary grouting pipe on the anchor cable, and lowering the anchor cable into the anchor cable hole;
3) the anchor cable comprises a free section and an anchoring section, impermeable fillers are wound on the periphery of the free section, when the anchor cable is placed in the anchor cable hole, the anchoring section is completely placed in the anchor cable hole, the lower part of the free section is placed in the anchor cable hole, and the upper part of the free section is placed outside the anchor cable hole;
4) performing primary grouting by using the primary grouting pipe;
5) after the primary grouting is finished, performing secondary grouting by using the secondary grouting pipe until grout overflows from the orifice of the anchor cable hole, and stopping grouting;
6) a fixing structure is arranged at the upper part of the free section, and after the slurry is solidified, the anchor cable and the support pile are tensioned and fixed through the fixing structure;
7) and finishing the construction.
2. The method for treating the water leakage of the free section of the anchor cable in the sand layer of the foundation pit as claimed in claim 1, wherein in the step 2), when the anchor cable is laid down, the end head of the secondary grouting pipe is fixed on the bottom end of the anchoring section, and the secondary grouting pipe is lowered to the bottom of the anchor cable hole along with the lowering of the anchor cable.
3. The method for treating water leakage of the free section of the anchor cable in the sand layer of the foundation pit as claimed in claim 2, wherein in step 3), when the bottom end of the anchoring section is lowered to the bottom of the anchor cable hole, grouting is performed into the anchor cable hole through the primary grouting pipe, grouting is stopped when grout overflows from the orifice of the anchor cable hole, and the anchor cable is pulled out by 0.25m in the direction away from the bottom of the hole and grouting is continued.
4. The method for treating the water leakage of the anchor cable at the free section of the sand layer of the foundation pit as claimed in claim 2, wherein in the step 4), a plurality of drill holes are drilled on the fixed structure along the direction towards the side wall of the foundation pit, the drill holes are arranged around the end head of the free end of the anchor cable, a plurality of grouting steel pipes which are oriented in different directions and embedded in the soil body at the side wall of the foundation pit are drilled into the drill holes, and the pipe bodies of the grouting steel pipes are provided with a plurality of drill holes.
5. The method for treating the water leakage of the anchor cable free section of the sand layer of the foundation pit as claimed in claim 1, wherein in the step 4), after one grouting is completed, grouting is performed into the grouting steel pipe until the grout leaks out from the orifice of the grouting steel pipe, the grouting is completed, and the steel pipe orifice of the grouting steel pipe is blocked by the grout prepared by using the curing agent.
6. The method for treating the water leakage of the free section of the anchor cable on the sand layer of the foundation pit as claimed in claim 1, wherein in the step 5), the fixed structure is a waist beam, the waist beam is fixed on the support pile, the anchoring section of the anchor cable is arranged on the waist beam in a penetrating way and is anchored and tensioned through an anchorage device, and if the water leakage from the waist beam occurs, the holes around the water leakage point of the waist beam are drilled and filled with grouting quick-setting grouting material.
7. The method for treating the water leakage of the anchor cable free section in the sand layer of the foundation pit as claimed in claim 1, wherein the waist beam is arranged on one side of the support pile far away from the side wall of the foundation pit, a plurality of anchor bars are pre-built in the support pile, the plurality of anchor bars extend out of the support pile and penetrate through the waist beam, and grout is poured into gaps among the anchor bars, the waist beam and the support pile through a high-pressure pouring machine.
8. The method for treating the water leakage of the free section of the anchor cable on the sand layer of the foundation pit as claimed in claim 1, wherein three steel strands are bound on the periphery of the primary grouting pipe to form the anchor cable, and a plurality of binding groups are bound on the periphery of the three steel strands along the length direction of the steel strands, and the plurality of binding groups are uniformly arranged at intervals.
9. The method for treating the water leakage of the free section of the anchor cable on the sand layer of the foundation pit as claimed in claim 1, wherein a plurality of support frames are installed on the anchor cable, the periphery of each support frame is inwards recessed to form a recessed groove, three steel strands are embedded into the recessed groove, the three steel strands are arranged in an equilateral triangle along the cross section direction of the anchor cable, the grouting pipe through holes are arranged in the middle of the three steel strand through holes, the plurality of support frames are uniformly arranged at intervals along the length direction of the steel strands, and the support frames and the wire groups are bundled and staggered.
10. The method for treating the water leakage of the free section of the anchor cable on the sand layer of the foundation pit as claimed in claim 1, wherein the primary grouting pipe penetrates through the center of the support frame, and the secondary grouting pipe penetrates through the edge of the support frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010019651.0A CN111236244A (en) | 2020-01-08 | 2020-01-08 | Method for treating water leakage of free section of anchor cable on sand layer of foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010019651.0A CN111236244A (en) | 2020-01-08 | 2020-01-08 | Method for treating water leakage of free section of anchor cable on sand layer of foundation pit |
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| CN111236244A true CN111236244A (en) | 2020-06-05 |
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| CN202010019651.0A Pending CN111236244A (en) | 2020-01-08 | 2020-01-08 | Method for treating water leakage of free section of anchor cable on sand layer of foundation pit |
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| CN (1) | CN111236244A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113529702A (en) * | 2021-06-18 | 2021-10-22 | 深圳市工勘岩土集团有限公司 | Foundation pit support anchor cable seepage double-liquid sealing grouting leakage stoppage construction structure |
| CN113529703A (en) * | 2021-06-18 | 2021-10-22 | 深圳市工勘岩土集团有限公司 | Double-liquid sealing grouting leakage-stopping construction method for foundation pit support anchor cable leakage |
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| JP5002517B2 (en) * | 2008-04-04 | 2012-08-15 | 株式会社タニガキ建工 | Fixing hardware, slope stabilization structure and slope stabilization method using the same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113529702A (en) * | 2021-06-18 | 2021-10-22 | 深圳市工勘岩土集团有限公司 | Foundation pit support anchor cable seepage double-liquid sealing grouting leakage stoppage construction structure |
| CN113529703A (en) * | 2021-06-18 | 2021-10-22 | 深圳市工勘岩土集团有限公司 | Double-liquid sealing grouting leakage-stopping construction method for foundation pit support anchor cable leakage |
| CN113529703B (en) * | 2021-06-18 | 2023-02-28 | 深圳市工勘岩土集团有限公司 | Double-liquid sealing grouting leakage-stopping construction method for foundation pit support anchor cable leakage |
| CN113529702B (en) * | 2021-06-18 | 2023-02-28 | 深圳市工勘岩土集团有限公司 | Foundation pit support anchor cable seepage double-liquid sealing grouting leakage stoppage construction structure |
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