CN111236244A - Method for treating water leakage of free section of anchor cable on sand layer of foundation pit - Google Patents

Abstract

The invention relates to the technical field of foundation pit support, and discloses a treatment method for water leakage in the free section of anchor cables in the sand layer of the foundation pit. The grouting pipe and the secondary grouting pipe, and the anchor cable is lowered into the anchor cable hole; the anchor cable includes a free section and an anchor section, and an anti-seepage filler is wrapped around the outer circumference of the free section. When inside the cable hole, all the anchoring sections are 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; the first grouting and the second grouting are carried out; After the slurry is solidified, the anchor cable is tensioned and fixed with the supporting pile through the fixed structure; the anti-seepage filler is wrapped around the free section of the anchor cable, and the anti-seepage filler is attached to the side wall of the anchor cable hole and is connected with the anchor cable. The pores are combined more closely, the slurry is attached to the outer periphery of the anti-seepage filler, and an integrated anti-seepage layer is formed between the slurry and the anti-seepage filler, so that a better waterproof and anti-seepage effect can be achieved.

Description

Treatment method for water leakage in the free section of anchor cable in the sand layer of foundation pit

technical field

The patent of the present invention relates to the technical field of foundation pit support, in particular, to a method for treating water leakage in the free section of the anchor cable in the sand layer of the foundation pit.

Background technique

At present, with the rapid development of urban construction, there are more and more deep foundation pit support projects. Due to its economic superiority and high construction efficiency, the pile-anchor support structure is more and more used in foundation pit support projects. more and more.

However, the common problem of water leakage along the bellows in the free section after the anchor cable is tensioned and locked in the sand layer of the deep foundation pit has not been well solved. Continuous water leakage will inevitably cause the groundwater level around the foundation pit to drop, which will lead to the influence of the foundation pit. The settlement of roads, pipelines and buildings (structures) in the area increases, or even exceeds the standard, which brings hidden dangers to the safety of foundation pits.

In the prior art, methods such as slurry plugging are generally used, but these methods have limited anti-seepage effect, and have the problem that the plugging of the anchor cable holes with serious water leakage cannot achieve a good anti-leakage effect.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a treatment method for water leakage in the free section of the anchor cable in the sand layer of the foundation pit, and to solve the problem that in the prior art, the plugging of the anchor cable hole with serious water leakage cannot play a good anti-leakage effect. .

The present invention is realized in this way, and the treatment method for the water leakage in the free section of the anchor cable in the sand layer of the foundation pit comprises the following construction steps:

1), drill the anchor cable hole on the side wall of the foundation pit;

2) Arrange a primary grouting pipe and a secondary grouting pipe on the anchor cable, and lower the anchor cable into the anchor cable hole;

3) The anchor cable includes a free section and an anchor section, and an anti-seepage filler is wound around the outer circumference of the free section. When the anchor cable is placed in the anchor cable hole, all the anchor sections are is placed in the anchor cable hole, the lower part of the free segment is placed in the anchor cable hole, and the upper part of the free segment is placed outside the anchor cable hole;

4), using the primary grouting pipe for the first grouting;

5) After the primary grouting is completed, use the secondary grouting pipe to carry out secondary grouting, and stop grouting until the slurry overflows from the orifice of the anchor cable hole;

6) A fixed structure is arranged on the upper part of the free section, and after the slurry is solidified, the anchor cable is tensioned and fixed with the support pile through the fixed structure;

7), the construction is completed.

Further, in step 2), when the anchor cable is lowered, the end of the secondary grouting pipe is fixed on the bottom end of the anchoring section. Lower the grouting pipe to the bottom of the anchor cable hole.

Further, in step 3), when the bottom end of the anchoring section is lowered to the bottom of the anchor cable hole, grouting is carried out into the anchor cable hole through the primary grouting pipe. When the orifice of the anchor cable hole overflows, stop grouting, and in the direction away from the bottom of the hole, pull the anchor cable outward by 0.25m, and continue grouting.

Further, in step 4), along the direction toward the side wall of the foundation pit, drill a plurality of drill holes on the fixed structure, the drill holes are arranged around the end of the free end of the anchor cable, and the drill holes are drilled toward the hole. A plurality of grouting steel pipes oriented in different directions and embedded in the soil of the side wall of the foundation pit are driven into the holes, and the pipe body of the grouting steel pipes has a plurality of drilling holes.

Further, in step 4), after the first grouting is completed, grouting is carried out into the grouting steel pipe until the slurry leaks from the orifice of the grouting steel pipe, the grouting is completed, and then the curing agent is used. The prepared slurry seals the steel pipe opening of the grouting steel pipe.

Further, in 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 worn on the waist beam, and anchoring, tensioning and tensioning are carried out by anchors. If there is water leakage from the waist beam, drill holes around the waist beam leakage point and fill it with grouting quick-setting grouting material.

Further, the waist beam is arranged on the side of the support pile away from the side wall of the foundation pit, a plurality of anchor bars are pre-built in the support pile, and the plurality of anchor bars extend out of the support pile and It is worn in the waist beam, and is poured into the gap between the anchor bar, the waist beam and the supporting pile by a high-pressure pouring machine.

Further, three steel strands are bundled on the outer circumference of the primary grouting pipe to form the anchor cable, and along the length direction of the steel strands, a plurality of bundles are bundled on the outer circumference of the three steel strands A wire group, wherein a plurality of the binding wire groups are evenly spaced.

Further, a plurality of support brackets are installed on the anchor cable, the outer periphery of the support brackets is recessed inward to form a concave groove, and the three steel strands are embedded in the concave groove, along the anchor In the cross-sectional direction of the cable, the three steel strands are arranged in an equilateral triangle, and the through hole of the grouting pipe is arranged in the middle of the three through holes of the steel strand, along the length direction of the steel strand, A plurality of the support brackets are arranged at even intervals, and the support brackets and the binding wire group are arranged in a staggered manner.

Further, the primary grouting pipe passes through the center of the support frame, and the secondary grouting pipe passes through the edge of the support frame.

Compared with the prior art, the present invention provides a method for treating water leakage in the free section of the anchor cable in the sand layer of the foundation pit. On the side wall, it is more closely combined with the anchor cable hole. After the first injection and the second injection, the slurry is attached to the outer periphery of the anti-seepage filler. After the slurry is solidified, an integrated anti-seepage arrangement is formed between the slurry and the anti-seepage filler. layer, so as to play a better waterproof and anti-seepage effect.

Description of drawings

Fig. 1 is the construction step flow chart of the treatment method of the seepage water in the free section of anchor cable in foundation pit sand layer provided by the present invention;

Fig. 2 is the grouting three-dimensional schematic diagram of the treatment method for water leakage in the free section of the anchor cable of the foundation pit sand layer provided by the present invention;

Fig. 3 is the front view of the position of grouting drilling hole in the treatment method for water leakage in the free section of anchor cable in foundation pit sand layer provided by the present invention;

Fig. 4 is the grouting sectional view in the treatment method for water leakage in the free section of the anchor cable of the foundation pit sand layer provided by the present invention;

5 is a schematic cross-sectional view of section 1-1 in the method for treating water leakage in the free section of the anchor cable in the sand layer of the foundation pit provided by the present invention;

6 is a schematic cross-sectional view of the 2-2 section in the method for treating water leakage in the free section of the anchor cable in the sand layer of the foundation pit provided by the present invention;

7 is a schematic cross-sectional view of section 3-3 in the method for treating water leakage in the free section of the anchor cable in the sand layer of the foundation pit provided by the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The implementation of the present invention will be described in detail below with reference to specific embodiments.

The same or similar numbers in the drawings of this embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. structure and operation, so the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation on this patent, and those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

Referring to Figures 1 to 7, it is a preferred embodiment provided by the present invention.

The treatment method for the seepage water in the free section of the anchor cable in the sand layer of the foundation pit includes the following construction steps:

1), drill the anchor cable hole 70 on the side wall of the foundation pit;

2) Arrange the primary grouting pipe and the secondary grouting pipe on the anchor cable 10, and lower the anchor cable 10 into the anchor cable hole 70;

3) The anchor cable 10 includes a free section 1010 and an anchoring section 1011. The outer circumference of the free section 1010 is wound with an anti-seepage filler 30. When the anchor cable 10 is placed in the anchor cable hole 70, all the anchoring sections 1011 are placed in the hole 70. 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), use a grouting pipe 120 for the first grouting;

5) After the primary grouting is completed, the secondary grouting pipe 130 is used for secondary grouting until the grouting overflows from the orifice of the anchor cable hole 70, and the grouting is stopped;

6), a fixed structure is provided on the upper part of the free section 1010, and after the slurry solidifies, the anchor cable 10 is tensioned and fixed with the support pile 20 through the fixed structure;

7), the construction is completed.

In the above-mentioned treatment method for water leakage in the free section 1010 of the anchor cable 10 of the foundation pit sand layer, the anti-seepage filler 30 is wrapped around the free section 1010 of the anchor cable 10, and the anti-seepage filler 30 is attached to the side of the anchor cable hole 70. On the wall, it is more closely combined with the anchor cable hole 70. After the primary injection and the secondary injection, the slurry adheres to the outer periphery of the anti-seepage filler 30. After the slurry solidifies, the slurry and the anti-seepage filler 30 form an integral arrangement. Impermeable layer, which can play a better waterproof and anti-seepage effect.

A sealing film is wrapped around the outer periphery of the anti-seepage filler 30, and vacuum is performed to keep the anti-seepage filler 30 in a tight state, which is convenient for installation and fixation, and also has a good waterproof effect.

The material of the sealing film can be a plastic film or an elastic rubber film.

Before excavation of the foundation pit, the supporting piles 20 are first driven, and then excavated from the top 91 of the foundation pit along the supporting piles 20 until the bottom 90 of the foundation pit is excavated. At this time, the lower end of the supporting piles 20 Inserted under the foundation pit.

The anti-seepage filler 30 can be made of waste fibers on the construction site, on the one hand, it can recycle the waste on the construction site, and on the other hand, it can reduce the construction cost.

On the other hand, the free segment 1010 has an upper part away from the anchoring segment 1011 and a lower part contacting the anchoring segment 1011. When winding the impermeable filler 30, the winding starts from the lower part of the free segment 1010 to the upper direction. The diameter of the lower portion of the segment 1010 after winding is complete is the same as the diameter of the cable hole 70 .

In addition, the winding length is 1 m or more.

In the direction from the rear end of the free section 1010 to the front end of the free section 1010, the thickness of the wound anti-seepage filler 30 gradually increases. In this case, when the anchor cable 10 is lowered, as the free section 1010 slowly enters the anchorage The fit between the cable hole 70 , the free section 1010 and the inner wall of the anchor cable hole 70 is getting tighter and tighter, thereby ensuring the tightness between the anchor cable 10 and the anchor cable hole 70 during construction.

In step 2), when the anchor cable 10 is lowered, the end of the secondary grouting pipe 130 is fixed on the bottom end of the anchoring section 1011. With the lowering of the anchor cable 10, the secondary grouting pipe 130 is lowered to the anchorage Bottom of cable hole 70.

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 carried out into the anchor cable hole 70 through the primary grouting pipe 120. When it overflows, stop grouting, and pull out the anchor cable 10 for 0.25m in the direction away from the bottom of the hole, and continue grouting.

Specifically, the bottom of the primary grouting pipe 120 has a grouting opening. During the grouting process, the slurry directly flows into the bottom of the anchor cable hole 70 through the primary grouting pipe 120. With the continuous accumulation of the slurry, the slurry slowly rises. When the slurry reaches the anti-seepage filler 30, soaks through the anti-seepage filler 30, and overflows from the anchor cable hole 70, the grouting can be stopped.

Grouting from the bottom up, the slurry can be slowly accumulated from bottom to top, and the voids in the borehole can be filled more comprehensively without leaving voids and air bubbles, so as to achieve a better perfusion effect.

After the first grouting is completed, due to the interference of air bubbles in the slurry or the interference of anchor cables 10, etc., it is likely to cause uneven grouting or there are still gaps that have not been grouted, thus affecting the grouting effect and even providing water leakage to the outside world. Therefore, after the first grouting is completed, a second grouting needs to be performed. The secondary grouting uses the secondary grouting pipe 130, and the wall of the secondary grouting pipe 130 has a plurality of openings around it. , through the secondary grouting, the void area that is not filled by the primary grouting can be further filled, so that the grout in the anchor cable hole 70 can be poured more densely, and the strength of the grout in the anchor cable hole 70 can be enhanced. It is more tightly fixed, on the other hand, the internal porosity of the slurry is reduced, which can have a better waterproof effect.

Before lowering the secondary grouting pipe 130, a plurality of sealing membranes are attached to the openings on the secondary grouting pipe 130. During the lowering process, the sealing membranes can realize the connection between the secondary grouting pipe 130 and the soil. Insulation, so as to prevent the external soil from entering the secondary grouting pipe 130 through the opening, causing problems such as blocking the secondary grouting pipe 130. During the filling process, driven by the slurry pressure, the sealing membrane ruptures , the grout enters the anchor cable hole 70 from the secondary grouting pipe 130 .

In step 4), drill a plurality of drill holes 102 on the fixed structure along the direction toward 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, and drill into the drill holes 102 A plurality of grouting steel pipes 101 facing different directions and embedded in the soil of the side wall of the foundation pit are inserted. The pipe body of the grouting steel pipe 101 has a plurality of drilling holes. The borehole of the grouting steel pipe 101 flows toward the surrounding soil, and after the slurry solidifies, it combines with the soil. The contact area of the soil layer can cement the loose and broken soil layer near the orifice into a whole, so that the fixing of the supporting pile 20 is more stable.

In step 4), after the first grouting is completed, grouting is performed into the grouting steel pipe 101 until the slurry leaks from the orifice of the grouting steel pipe 101, the grouting is completed, and then the slurry prepared by using the curing agent is used. The steel pipe opening of the grouting steel pipe 101 is blocked, and the orifice of the drilled hole 102 is sealed without leaving any gaps, so as to prevent water from penetrating 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 slurry used for the above-mentioned primary grouting and secondary grouting is a slurry liquid, and the slurry used for the grouting steel pipe 101 is a slurry prepared by using a curing agent.

The components of the curing agent include high-efficiency structural agent and admixture. The high-efficiency structural agent and the admixture are mixed with water to form a solidified slurry. The empty pile section 300 has waste slurry, and the solidified slurry is injected into the waste slurry together with high-pressure air; the high-efficiency structural agent accounts for 10% to 20% of the weight of the waste slurry, water accounts for 10% to 20% of the weight of the waste slurry, and admixtures account for 0.5% to 1.5% of the weight of the waste slurry. agent to enhance curing performance.

In step 5), the fixing structure is the waist beam 40, the waist beam 40 is fixed on the support pile 20, the anchoring section 1011 of the anchor cable 10 is worn on the waist beam 40, and is anchored and tensioned by the anchor 42, If there is water leakage from the waist beam 40, the holes around the water leakage point of the waist beam 40 are filled with grouting and quick-setting grouting material.

Specifically, the anchoring section 1011 of the anchor cable is first lowered into the anchor cable hole 70 , and the anchor cable is fixed in the anchor cable hole 70 through primary grouting and secondary grouting. At this time, the free section 1010 is placed in the anchor cable hole 70 After the slurry solidifies, the free section 1010 is then passed through the back of the waist beam 40, and then anchored by the anchor 70. The thickness of the filler 30 is gradually increased, and as the anchor 70 is stretched, the anti-seepage filler 30 can be more closely fitted and fixed with the waist beam 40 to increase the tightness during the fixing process.

A steel backing plate 43 is provided below the anchor 42 .

Grouting quick-setting grouting material is a powdered grouting material composed of water-soluble polymer, surface active substances, etc. self-consolidation.

The waist beam 40 is arranged on the side of the support pile 20 away from the side wall of the foundation pit, and a plurality of anchor bars 44 are pre-built in the support pile 20, and the multiple anchor bars 44 extend out of the support pile 20 and pass through the waist beam. 40, and the high-pressure pouring machine is used to pour slurry into the space between the anchor bars 44, the waist beam 40 and the supporting pile 20.

The waist beam 40 has a pressing surface arranged toward the supporting pile 20, and the surface of the pressing surface is chiseled, that is, the surface of the pressing surface is chiseled into an uneven shape, and then fixedly connected to the supporting pile 20 through the anchor 42. , at this time, the pressing surface of the waist beam 40 is pressed against the outer surface of the supporting pile 20 ;

Three steel strands 105 are bundled on the outer periphery of the primary grouting pipe 120 to form the anchor cable 10, and along the longitudinal direction of the steel strands 105, a plurality of binding wire groups 300 are bundled around the outer periphery of the three steel strands 105. The binding wire groups 300 are evenly spaced.

A beef tendon sleeve 1051 is sleeved on the outer periphery of the steel strand 105 , which can protect the steel strand 105 from corrosion.

The primary grouting pipe 120 is a soft tubular material, and the primary grouting pipe 120 is fixed in the middle of the three steel strands 105. In the process of lowering the steel strands 105, on the one hand, the interference of the soil layer can be avoided, and the slurry flows The process is more unobstructed, and on the other hand, it can also play the role of guiding and positioning the primary grouting pipe 120 in the following process.

A plurality of support brackets 310 are installed on the anchor cable 10, the outer circumference of the support brackets 310 is recessed inward to form a concave groove, and three steel strands 105 are embedded in the concave groove, along the cross-sectional direction of the anchor cable 10, three The steel strands 105 are arranged in an equilateral triangle, and the through holes of the grouting pipes are arranged in the middle of the three through holes of the steel strands 105. Along the length of the steel strands 105, a plurality of support frames 310 are arranged at even intervals to support The frame 310 and the binding wire group 300 are arranged in a staggered manner, so that the width and narrowness of the anchor cable 10 are arranged in a staggered manner in the length direction. The section of part of the anchor cable 10 of 300 is small. When winding the anti-seepage filler 30, it starts to wind from the binding wire group 300 to the direction of the support frame 310. The diameter of the cable hole 70 shall be the same. After winding to the support frame 310, continue winding, and wind towards the next binding wire group 300 until the winding length meets the design requirements.

During the winding process, since the thickness of the anchor cable 10 is not uniform, it can be combined with the anti-seepage filler 30 more tightly, it is not easy to slide on the anchor cable 10, and the fixing effect is better.

The bottom end of the anchor cable 10 is provided with a guide cap 107 , and the guide cap 107 is arranged in an inverted conical shape, which can play a role of pulling and guiding the anchor cable 10 during the process of lowering the anchor cable 10 .

The primary grouting pipe 120 passes through the center of the support frame 310 , the primary grouting pipe 120 also transmits through the center of the binding wire group 300 , and the secondary grouting pipe 130 passes through the edge of the support frame 310 . In this way, The coverage of the primary grouting through the primary grouting pipe 120 and the grouting through the secondary grouting pipe 130 is larger, and the grouting can be more fully poured into the anchor cable hole 70 .

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. the treatment method of the seepage water of the free section of the anchor cable of the foundation pit sand layer, is characterized in that, comprises the following construction steps: 1), drill the anchor cable hole on the side wall of the foundation pit; 2) Arrange a primary grouting pipe and a secondary grouting pipe on the anchor cable, and lower the anchor cable into the anchor cable hole; 3) The anchor cable includes a free section and an anchor section, and an anti-seepage filler is wound around the outer circumference of the free section. When the anchor cable is placed in the anchor cable hole, all the anchor sections are is placed in the anchor cable hole, the lower part of the free segment is placed in the anchor cable hole, and the upper part of the free segment is placed outside the anchor cable hole; 4), using the primary grouting pipe for the first grouting; 5) After the primary grouting is completed, use the secondary grouting pipe to carry out secondary grouting, and stop grouting until the slurry overflows from the orifice of the anchor cable hole; 6) A fixed structure is arranged on the upper part of the free section, and after the slurry is solidified, the anchor cable is tensioned and fixed with the support pile through the fixed structure; 7), the construction is completed. 2. The method for treating water leakage in the free section of anchor cable in foundation pit sand layer as claimed in claim 1, wherein in step 2), when the anchor cable is lowered, the end of the secondary grouting pipe is The head is fixed on the bottom end of the anchoring section, and as the anchor cable is lowered, the secondary grouting pipe is lowered to the bottom of the anchor cable hole. 3. The treatment method for water leakage in the free section of anchor cable in foundation pit sand layer as claimed in claim 2, characterized in that, in step 3), when the bottom end of the anchoring section is lowered to the bottom of the anchor cable hole. At the bottom of the hole, grouting is carried out into the anchor cable hole through the primary grouting pipe. When the grout overflows from the orifice of the anchor cable hole, the grouting is stopped, and along the direction away from the hole bottom, the grouting is carried out. The anchor cable is pulled out by 0.25m, and the grouting is continued. 4. the treatment method of the water seepage of the free section of the anchor cable in the foundation pit sand layer as claimed in claim 2, it is characterized in that, in step 4), along the direction towards the side wall of the foundation pit, drill a plurality of drills on the fixed structure a hole, the drill hole is arranged around the end of the free end of the anchor cable, and a plurality of grouting steel pipes oriented in different directions and embedded in the soil of the side wall of the foundation pit are driven into the drill hole, The pipe body of the grouting steel pipe has a plurality of drilling holes. 5. The method for treating leakage of water in the free section of anchor cable in foundation pit sand layer as claimed in claim 1, characterized in that, in step 4), after one-time grouting is completed, injection is carried out in the grouting steel pipe. Grout until the slurry leaks from the orifice of the grouting steel pipe, and the grouting is completed, and then the steel pipe port of the grouting steel pipe is blocked with the slurry prepared by using the curing agent. 6. the treatment method of water leakage in the free section of anchor cable in foundation pit sand layer as claimed in claim 1, it is characterized in that, in step 5), fixed structure is waist beam, and described waist beam is fixed on the support pile , the anchoring section of the anchor cable is worn on the waist beam, and is anchored and tensioned by anchors. If there is water leakage from the waist beam, drill holes around the waist beam leakage point. Filling with quick-setting grouting material. 7. The method for treating water leakage in the free section of anchor cable in foundation pit sand layer according to claim 1, wherein the waist beam is arranged on the side of the support pile away from the side wall of the foundation pit, A plurality of anchor bars are pre-built in the support pile, and the anchor bars extend out of the support pile and pass through the waist beam, and are injected into the anchor bars, the waist beam and the support through a high-pressure pouring machine. The gaps between the piles are filled with grout. 8. The method for treating leakage of water in the free section of anchor cable in foundation pit sand layer according to claim 1, wherein the anchor cable is formed by bundling three steel strands on the periphery of the primary grouting pipe, and , along the length direction of the steel strands, a plurality of binding wire groups are bundled on the outer periphery of the three steel strands, and the plurality of the binding wire groups are evenly arranged at intervals. 9 . The method for treating water leakage in the free section of anchor cable in foundation pit sand layer according to claim 1 , wherein a plurality of support frames are installed on the anchor cable, and the outer periphery of the support frame faces inward. 10 . The depression forms a depression groove, and the three steel strands are embedded in the depression groove, along the cross-sectional direction of the anchor cable, the three steel strands are arranged in an equilateral triangle, and the grouting pipe The holes are arranged in the middle of the three through-holes of the steel strand, and along the length direction of the steel strand, a plurality of the support brackets are arranged at even intervals, and the support brackets and the bundling wire group are arranged in a staggered manner . 10. The method for treating water leakage in the free section of the anchor cable in the sand layer of the foundation pit according to claim 1, wherein the primary grouting pipe passes through the center of the support frame, and the secondary grouting pipe passes through the center of the support frame. arranged on the edge of the support frame.

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