Pile foundation anchoring sand prevention device and permeable sand layer treatment method

Abstract

The invention relates to the field of pile foundation sand layer treatment, in particular to a pile foundation anchoring sand prevention device and a permeable sand layer governance method.The pile foundation anchoring sand prevention device comprises a flexible sand prevention dense-mesh net, a pop-up anchoring assembly and a pop-up control assembly, the flexible sand prevention dense-mesh net is tightened and supported through a supporting cage, a drilled pile wellhead is formed in the ground, a sand layer is arranged in the drilled pile wellhead, and the pop-up anchoring assembly is connected with the pop-up control assembly; the sand filtering and supporting effects of the hole wall of the pile foundation adjacent to the water permeable sand layer can be achieved, meanwhile, the device and the construction technology have the multiple construction advantages of being high in precision, high in efficiency, high in benefit and the like, the technical benefit is remarkable, the problems of pile foundation hole collapse, reworking or over-pouring of concrete and the like are avoided, the reworking or treatment cost can be comprehensively reduced, and compared with a common construction method, the construction method has the advantage that the construction cost is reduced. According to the construction method, by means of the designed device, the pile foundation hole forming quality and safety under the special and complex permeable sand layers and other complex geological conditions can be achieved, certain reference value is provided for construction under the adjacent water permeable sand layers and other hole collapse prone geological conditions, and good social benefits can be brought.

Description

Technical Field

[0001] The present invention relates to the field of pile foundation sand layer treatment, in particular to a pile foundation anchoring sand prevention device and a permeable sand layer treatment method. Background Art

[0002] Bridge pile foundation is an important part of bridge engineering. Common foundation forms include flat plate, pile and combined types. The size and depth should be determined according to the load of the superstructure and geological conditions. The drilling method should be selected according to the geological conditions and construction conditions, such as mechanical drilling, manual drilling, punching, etc. The pouring technology should take into account factors such as concrete mix ratio, pouring speed, and buried depth of the conduit to ensure the quality of concrete and the integrity of the pile foundation. During the construction process, effective quality control measures should be taken, such as regular quality inspections and construction parameter control, to ensure that the construction quality of the pile foundation meets the requirements.

[0003] During the construction of bridge pile foundations, some special situations may be encountered, such as emergencies, underground obstacles, ultra-thick permeable sand layers, construction close to water, high pressure-bearing layers, etc. When constructing ultra-thick permeable sand layers close to water, or ultra-deep large-diameter pile foundations, due to the instability of the permeable sand layer, problems such as pile foundation drilling and poor pile quality in the later stage are likely to occur during construction, and the management and maintenance costs are high and the efficiency is low. Summary of the Invention

[0004] The object of the present invention is to provide a pile foundation anchoring sand control device and a permeable sand layer treatment method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a pile foundation anchoring sand control device, comprising:

[0006] A flexible sand-proof mesh is supported by a support cage, wherein a bored pile wellhead is provided on the ground, wherein a sand layer is present in the bored pile wellhead, and the flexible sand-proof mesh is placed in the sand layer in the bored pile wellhead, and the support cage comprises two support rings and a plurality of vertical keels;

[0007] A pop-up anchor assembly is provided on one side of the support ring. The pop-up anchor assembly includes a plurality of positioning connection blocks and a plurality of anchor rods. The plurality of anchor rods horizontally penetrate the plurality of positioning connection blocks and one side of the flexible sand control dense mesh respectively.

[0008] A pop-up control component is arranged at the center of the flexible sand-proof dense mesh net. The pop-up control component includes a control rod and a plurality of support push rods. One side of the plurality of support push rods is respectively connected to a plurality of anchor rods.

[0009] Preferably, the several vertical keels of the support cage are respectively arranged vertically between the two support rings to form a cage structure, the flexible sand-proof dense mesh net is sleeved on the outside of the cage structure composed of the two support cages, and the length of the flexible sand-proof dense mesh net and the support cage is greater than the thickness of the sand layer.

[0010] Preferably, the upper ends of the plurality of positioning and connecting blocks are vertically provided with extension hanging rods, the plurality of extension hanging rods respectively penetrate and plug into the two support rings, and the plurality of extension hanging rods are respectively hung on the upper and lower sides of the flexible sand-proof dense mesh net.

[0011] Preferably, a press-fitting ring is provided on one side of the support ring, and one side of the flexible sand-proof dense mesh hanging extension rod is located between the support ring and the press-fitting ring. A center groove is provided through the center of the extension rod through the positioning connecting block, and an assembly thread groove is provided at the upper end of the center groove. The press-fitting ring is located on one side of the extension rod and is vertically inserted with an assembly bolt, and the lower end of the assembly bolt is threadedly inserted into the assembly thread groove of the extension rod.

[0012] Preferably, a guide slot is horizontally penetrated through the lower end of the positioning connection block, one end of the anchor rod is horizontally movable and penetrates the guide slot, and the side of the anchor rod close to the flexible sand-proof dense mesh is a pointed cone structure.

[0013] Preferably, the guide slot is connected to the center slot, and an anchor rod is provided at the lower end of the assembly bolt located in the center slot, a constraint block is vertically movably inserted in the anchor rod, and a floating screw is vertically provided at the upper end of the constraint block. The upper end of the floating screw vertically moves through the upper end of the assembly bolt and is provided with a limit nut through a threaded socket. The floating screw passes through the upper end of the assembly bolt and is provided with an indicator mark, and a support spring is socketed on one side of the floating screw located in the anchor rod.

[0014] Preferably, two constraint grooves are symmetrically opened on a side of the anchor rod close to the constraint block, the lower end of the constraint block is inserted into one of the constraint grooves of the anchor rod, and the side of the constraint block away from the pointed cone structure of the anchor rod is an inclined surface.

[0015] Preferably, the control rod is provided with control rings on both sides close to the support cage, and several support push rods are rotatably connected to the outer sides of the two control rings through pin shafts. An L-shaped combination block is provided at the end of the support push rod away from the control rod, and a hanging rod is horizontally provided on one side of the L-shaped combination block. A combination ring is provided at the end of the anchor rod away from the positioning connection block, and the hanging rod is horizontally inserted into the combination ring.

[0016] Preferably, the hanging rod is inserted into the combination ring and is provided with a hanging groove on one side close to the support push rod. The width of the hanging groove is greater than the thickness of the combination ring. When several support push rods hoist the flexible sand-proof dense mesh net and the support cage through several anchor rods, one side of the assembly ring of the anchor rod is clamped in the hanging groove of the hanging rod.

[0017] A method for treating a permeable sand layer using a pile foundation anchoring sand control device comprises the following steps:

[0018] Step 1: Weld the support ring and vertical keel of the support cage in advance, then put the flexible sand-proof mesh on the outside of the support cage, extend the hanging rod through the support cage, and weld the positioning connection block to the support cage. At this time, the upper and lower ends of the flexible sand-proof mesh are first hung with several extended hanging rods, and then pressed on one side of the support ring through the press-fitting ring to clamp and fix the two ends of the flexible sand-proof mesh. The assembly bolts are used to fit and fix the press-fitting ring and the support ring;

[0019] Step 2: An anchor rod is positioned and inserted into the positioning connection block through a restraining block that can be telescopically moved up and down. At this time, the restraining block is inserted into the restraining groove of the anchor rod. The anchor rod can only push the restraining block toward the outside of the cylinder composed of the flexible sand control mesh.

[0020] Step 3: When the control rod moves downward, the support push rod moves downward synchronously, and the anchor rod cannot move downward. At this time, several support push rods push several anchor rods to move toward the inner wall of the bored pile wellhead and anchor them, and then the flexible sand-proof dense mesh covers the sand layer area.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] It can achieve the effect of sand filtering and supporting the hole wall of the pile foundation near the water-adjacent permeable sand layer. At the same time, the equipment and construction technology of this device have many construction advantages such as high precision, high efficiency and high benefit, and the technical benefits are significant. It can avoid the occurrence of problems such as pile foundation collapse, rework or over-pouring of concrete, and can comprehensively reduce rework or processing costs. Compared with general construction methods, this method can achieve the quality and safety of pile foundation holes under complex geological conditions such as special and complex permeable sand layers by using the designed device, which provides a certain reference value for construction under geological conditions prone to collapse such as near water-adjacent permeable sand layers, and can bring good social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the construction state of the present invention;

[0024] Figure 2 Schematic diagram of the structure of the sand control device of the present invention;

[0025] Figure 3 For the present invention Figure 2 Schematic diagram of part A;

[0026] Figure 4 It is a schematic diagram of the side sectional structure of the present invention;

[0027] Figure 5 For the present invention Figure 4 Schematic diagram of part B;

[0028] Figure 6 For the present invention Figure 5 Schematic diagram of the C part;

[0029] Figure 7 This is an exploded view of the support cage connection of the present invention;

[0030] Figure 8 For the present invention Figure 7 Schematic diagram of part D.

[0031] In the figure: flexible sand-proof dense mesh 1, support cage 2, bored pile wellhead 3, sand layer 4, support ring 5, vertical keel 6, press-fit ring 7, positioning connection block 8, extension hanging rod 9, assembly bolt 10, assembly thread groove 11, guide slide groove 12, anchor rod 13, constraint block 14, floating screw 15, support spring 16, constraint groove 17, control rod 18, control ring 19, support push rod 20, hanging rod 21, hanging groove 22, indicator mark 23. DETAILED DESCRIPTION

[0032] In order to clearly and completely describe the objectives and technical solutions of the present invention and make the advantages more clearly understood, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figures 1-8 , the present invention provides the following technical solutions:

[0034] Embodiment 1: A pile foundation anchoring sand control device comprises a flexible sand control mesh 1, which is tightened and supported by a support cage 2. A bored pile wellhead 3 is opened on the ground, and a sand layer 4 is arranged in the bored pile wellhead 3. The flexible sand control mesh 1 is placed in the sand layer 4 in the bored pile wellhead 3. The support cage 2 comprises two support rings 5 and a plurality of vertical keels 6. The plurality of vertical keels 6 of the support cage 2 are respectively vertically arranged between the two support rings 5 and form a cage structure. The flexible sand control mesh 1 is sleeved on the outside of the cage structure formed by the two support cages 2, and the length of the flexible sand control mesh 1 and the support cage 2 is greater than the thickness of the sand layer 4. After the flexible sand control mesh 1 and the support cage 2 form a sand control device, the position that needs to be treated can be covered.

[0035] A pop-up anchor assembly is provided for fixing and positioning the sand control device. The pop-up anchor assembly is provided on one side of the support ring 5. The pop-up anchor assembly includes a plurality of positioning connection blocks 8 and a plurality of anchor rods 13. The plurality of anchor rods 13 respectively pass through a plurality of positioning connection blocks 8 and one side of the flexible sand control mesh 1 horizontally. The upper ends of the plurality of positioning connection blocks 8 are vertically provided with extension hanging rods 9. The plurality of extension hanging rods 9 respectively pass through and plug in two support rings 5, and the upper and lower sides of the flexible sand control mesh 1 are respectively hung with a plurality of extension hanging rods 9. A press-fit ring 7 is provided on one side of the support ring 5. The flexible sand control device is convenient to install and fix. One side of the dense mesh net 1 hanging the extension hanging rod 9 is located between the support ring 5 and the press-fitting ring 7. The center of the extension hanging rod 9 passes through the positioning connecting block 8 to provide a center groove, and the upper end of the center groove is provided with an assembly thread groove 11. The press-fitting ring 7 is located on one side of the extension hanging rod 9 and is vertically inserted with an assembly bolt 10. The lower end of the assembly bolt 10 is threadedly inserted into the assembly thread groove 11 of the extension hanging rod 9. Through the cooperation of the support ring 5, the press-fitting ring 7 and the extension hanging rod 9, the flexible sand-proof dense mesh net 1 can be quickly assembled and tightened to ensure the protective effect of the flexible sand-proof dense mesh net 1.

[0036] The lower end of the positioning connection block 8 is horizontally penetrated with a guide slot 12, and one end of the anchor rod 13 is horizontally movable and penetrates the guide slot 12. The side of the anchor rod 13 close to the flexible sand control dense mesh 1 is a pointed cone structure. The guide slot 12 is connected to the center groove. The assembly bolt 10 is located in the center groove and an anchor rod 13 is provided at the lower end. A constraint block 14 is vertically movable in the anchor rod 13. A floating screw 15 is vertically provided at the upper end of the constraint block 14. The upper end of the floating screw 15 vertically penetrates the upper end of the assembly bolt 10 and is provided with a limit nut through a threaded sleeve. The floating screw 15 penetrates the assembly bolt 10. An indicator mark 23 is provided at the upper end of the mounting bolt 10, and a support spring 16 is sleeved on one side of the floating screw 15 located inside the anchor rod 13. Two constraint grooves 17 are symmetrically provided on the side of the anchor rod 13 close to the constraint block 14. The lower end of the constraint block 14 is inserted into one of the constraint grooves 17 of the anchor rod 13, and the side of the constraint block 14 away from the pointed cone structure of the anchor rod 13 is an inclined surface. The anchor rod 13 is slidably connected to the positioning connection block 8. Balls can be set or grease can be added at the connection position between the anchor rod 13 and the positioning connection block 8 to make the horizontal sliding of the anchor rod 13 smoother.

[0037] A pop-up control assembly is provided to synchronously pop out a plurality of anchor rods 13 on one side of the two support cages 2. The pop-up control assembly is provided at the center of the flexible sand-proof dense mesh net 1. The pop-up control assembly includes a control rod 18 and a plurality of support push rods 20. One side of the plurality of support push rods 20 is respectively connected to the plurality of anchor rods 13. A control ring 19 is provided on both sides of the control rod 18 close to the support cage 2. The plurality of support push rods 20 are respectively connected to the outer sides of the two control rings 19 through pins. An L-shaped combination is provided at one end of the support push rod 20 away from the control rod 18. Block, a hanging rod 21 is horizontally provided on one side of the L-shaped combination block, and a combination ring is provided on the end of the anchor rod 13 away from the positioning connection block 8, and the hanging rod 21 is horizontally inserted into the combination ring. When the flexible sand-control mesh 1 and the support cage 2 are in the hoisting state, the pressing ring 7 and the control rod 18 are hoisted respectively by the steel strand with scale and rubber skin. The upper end of the control rod 18 needs to be exposed to the upper end of the bored pile wellhead 3 to keep the vertical and stable descent of the flexible sand-control mesh 1. The connection method of the hanging rod 21 and the anchor rod 13 is convenient for the subsequent removal operation;

[0038] The hooking rod 21 is inserted into the combination ring and is provided with a hooking groove 22 on one side close to the support push rod 20. The width of the hooking groove 22 is greater than the thickness of the combination ring. When a plurality of support push rods 20 are used to hoist the flexible sand control dense mesh net 1 and the support cage 2 through a plurality of anchor rods 13, one side of the assembly ring of the anchor rod 13 is clamped in the hooking groove 22 of the hooking rod 21. When the support push rod 20 plays a certain lifting role on the anchor rod 13, the hooking groove 22 of the hooking rod 21 will Buckle the assembly ring of the anchor rod 13 to prevent it from falling. When the support push rod 20 pushes the anchor rod 13 to insert into the hole wall of the bored pile wellhead 3, the support push rod 20 is in a horizontal posture, and the side of the hanging rod 21 without the hanging groove 22 abuts against the inner side wall of the combination ring, and the hanging groove 22 is disengaged from the combination ring. At this time, rotating the control rod 18 can realize that several hanging rods 21 are disengaged from the combination ring of the anchor rod 13 at the same time, saving time and effort when removing the control rod 18 later.

[0039] A method for treating a permeable sand layer using a pile foundation anchoring sand control device:

[0040] Preparation of site, platform and mud pool: After cleaning the site, platform and mud pool, use the total station coordinate setting out method to set out the center position of the pile, determine the center of the pile, set up cross guard piles around the center with a radius larger than the pile body, mark and fix them, and make the measurement error zero error. Drive a 35-40cm long steel bar 30cm into the ground (surrounded by cement mortar or concrete for protection) to mark the center of the pile. Mark the area around the pile to facilitate identification and prevent damage to the pile guard during mechanical relocation. After verification and approval by the resident supervising engineer, proceed to the next step.

[0041] Based on the geological conditions, a 3m-high steel casing with a diameter of 1.8m and a wall thickness of 6mm was used during construction. The bottom and surrounding areas of the casing were filled with clay and compacted layer by layer. The casing was buried to a depth of 2.7m, with the top of the casing elevated 0.3m above the water surface for maximum wave height. Steel lugs were welded to the top. The vertical centerline of the casing overlapped with the pile centerline, with a 50mm tolerance for planar deviation and a maximum vertical inclination of 1%. During drilling, a dedicated person was assigned to inspect the casing for any deviation or sinking, and any changes were addressed promptly.

[0042] Drilling: Before the drilling rig is in place, the pile position should be checked in detail. The ground should be compacted or replaced with a roller after the drilling rig is in place to ensure that the drill bit center and the pile center stakeout point are on the same plumb line after the drilling rig is in place. This ensures that the pile position is correct when drilling and that the drilling rig is stable during construction.

[0043] When you start drilling, do it slowly. For the bottom of the casing, drill at a low gear and slow speed to ensure that there is a solid mud wall at the bottom.

[0044] During the drilling process, always pay attention to changes in the soil layer. Take slag samples at the place where the soil layer changes to identify the soil layer and record it in the record sheet for comparison with the geological profile. Regularly test the boreholes and measure the mud density, viscosity, and sand ratio in a timely manner. If the mud performance indicators do not meet the soil layer requirements, make timely adjustments. When handing over the shift, explain the drilling situation of the shift and the precautions to be taken when leaving get off work.

[0045] A trial hole should be drilled before trial pile drilling. During the formal construction of the trial pile, the construction should be carried out according to the actual layout of the site. The drilling parameters should be mastered when operating the drilling rig. Attention should be paid to any abnormal conditions. After the hole is drilled to the designed hole depth, a preliminary hole cleaning should be carried out first. Then, all requirements for the hole should be inspected and accepted together with all parties involved in the project. Only after passing the inspection can the next process be carried out.

[0046] When the drilling hole reaches the designed elevation, use a hole detector to check the hole depth, hole diameter, hole position and hole shape, verticality, and geological conditions at the bottom of the hole. Then fill in the final hole record and promptly notify the supervision engineer to come to the site for inspection and acceptance. Only after passing the inspection can the next process be entered.

[0047] The support cage 2 is welded in advance, and then the flexible sand-proof dense mesh net 1 is sleeved and tightened on the outside of the support cage 2 with the extension hanging rod 9 and the press-fitting ring 7. The positioning connection block 8 and the extension hanging rod 9 can be welded and positioned with the support cage 2 in advance. After the press-fitting ring 7 and the support ring 5 clamp and fix the flexible sand-proof dense mesh net 1, the assembly bolt 10 is inserted into the center groove of the extension hanging rod 9 and the positioning connection block 8. After the anchor rod 13 is inserted into the positioning connection block 8, the anchor rod 13 can only push the constraint block 14 to move toward the outside of the cylinder composed of the flexible sand-proof dense mesh net 1;

[0048] Several lifting rings are welded to the upper end of the press ring 7, and steel strands with scales and covered with rubber are connected to the lifting rings. The cylindrical device consisting of the flexible sand-proof dense mesh 1 and the support cage 2 is placed into the bored pile wellhead 3 by a crane. After reaching the specified position, the control rod 18 is pressed down with a certain force to anchor the ends of the several anchor rods 13 away from the support push rod 20 on the hole wall of the bored pile wellhead 3, thereby realizing the support and anchoring effect of the ultra-thick permeable sand layer.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A pile foundation anchoring sand control device, characterized in that: include: A flexible sand-proof dense mesh net (1) is supported by a support cage (2) through tension, a bored pile wellhead (3) is provided on the ground, a sand layer (4) is provided in the bored pile wellhead (3), the flexible sand-proof dense mesh net (1) is placed in the sand layer (4) in the bored pile wellhead (3), and the support cage (2) includes two support rings (5) and a plurality of vertical keels (6); A pop-up anchor assembly, the pop-up anchor assembly being arranged on one side of the support ring (5), the pop-up anchor assembly comprising a plurality of positioning connection blocks (8) and a plurality of anchor rods (13), the plurality of anchor rods (13) respectively horizontally penetrating the plurality of positioning connection blocks (8) and one side of the flexible sand-proof dense mesh net (1); A pop-up control assembly is provided at the center of a flexible sand-proof dense mesh net (1). The pop-up control assembly comprises a control rod (18) and a plurality of support push rods (20). One side of the plurality of support push rods (20) is respectively connected to a plurality of anchor rods (13).

2. A pile foundation anchoring sand control device according to claim 1, characterized in that: The plurality of vertical keels (6) of the support cage (2) are respectively arranged vertically between the two support rings (5) to form a cage structure; the flexible sand-proof dense mesh net (1) is sleeved on the outside of the cage structure formed by the two support cages (2); and the length of the flexible sand-proof dense mesh net (1) and the support cage (2) is greater than the thickness of the sand layer (4).

3. The pile foundation anchoring sand control device according to claim 2, characterized in that: The upper ends of the plurality of positioning connection blocks (8) are vertically provided with extension hanging rods (9), the plurality of extension hanging rods (9) respectively penetrate and plug into the two support rings (5), and the upper and lower sides of the flexible sand-proof dense mesh net (1) are respectively hung with the plurality of extension hanging rods (9).

4. The pile foundation anchoring sand control device according to claim 3, characterized in that: A press-fitting ring (7) is provided on one side of the support ring (5); one side of the flexible sand-proof dense mesh (1) hanging the extension hanging rod (9) is located between the support ring (5) and the press-fitting ring (7); the center of the extension hanging rod (9) passes through the positioning connection block (8) to form a central groove; the upper end of the central groove is provided with an assembly thread groove (11); the press-fitting ring (7) is located on one side of the extension hanging rod (9) and is vertically inserted with an assembly bolt (10); the lower end of the assembly bolt (10) is threadedly inserted into the assembly thread groove (11) of the extension hanging rod (9).

5. The pile foundation anchoring sand control device according to claim 4, characterized in that: A guide slot (12) is horizontally penetrated through the lower end of the positioning connection block (8), and one end of the anchor rod (13) is horizontally movable and penetrates the guide slot (12). The side of the anchor rod (13) close to the flexible sand-proof dense mesh net (1) is a pointed cone structure.

6. The pile foundation anchoring sand control device according to claim 5, characterized in that: The guide slot (12) is connected to the central slot, and an anchor rod (13) is provided at the lower end of the assembly bolt (10) located in the central slot. A constraint block (14) is vertically inserted in the anchor rod (13). A floating screw (15) is vertically provided at the upper end of the constraint block (14). The upper end of the floating screw (15) vertically moves through the upper end of the assembly bolt (10) and is provided with a limit nut through a threaded sleeve. The floating screw (15) passes through the upper end of the assembly bolt (10) and is provided with an indicator mark (23). A support spring (16) is sleeved on one side of the floating screw (15) located in the anchor rod (13).

7. The pile foundation anchoring sand control device according to claim 6, characterized in that: Two constraint grooves (17) are symmetrically provided on a side of the anchor rod (13) close to the constraint block (14); the lower end of the constraint block (14) is inserted into one of the constraint grooves (17) of the anchor rod (13); and a side of the constraint block (14) away from the pointed cone structure of the anchor rod (13) is an inclined surface.

8. The pile foundation anchoring sand control device according to claim 7, characterized in that: The control rod (18) is provided with a control ring (19) on both sides close to the support cage (2), and a plurality of support push rods (20) are rotatably connected to the outer sides of the two control rings (19) through pin shafts. An L-shaped combination block is provided at one end of the support push rod (20) away from the control rod (18), and a hanging rod (21) is horizontally provided on one side of the L-shaped combination block. A combination ring is provided at one end of the anchor rod (13) away from the positioning connection block (8), and the hanging rod (21) is horizontally inserted into the combination ring.

9. The pile foundation anchoring sand control device according to claim 8, characterized in that: The hooking rod (21) is inserted into the assembly ring and is provided with a hooking groove (22) on one side close to the support push rod (20). The width of the hooking groove (22) is greater than the thickness of the assembly ring. When a plurality of support push rods (20) are used to hoist the flexible sand-proof dense mesh net (1) and the support cage (2) through a plurality of anchor rods (13), one side of the assembly ring of the anchor rod (13) is clamped into the hooking groove (22) of the hooking rod (21).

10. A method for treating a permeable sand layer using the pile foundation anchoring sand control device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: The support ring (5) and the vertical keel (6) of the support cage (2) are welded in advance, and then the flexible sand-proof mesh net (1) is sleeved on the outside of the support cage (2), and the extended hanging rod (9) passes through the support cage (2) and the positioning connection block (8) is welded and fixed to the support cage (2). At this time, the upper and lower ends of the flexible sand-proof mesh net (1) are first hung with a plurality of extended hanging rods (9), and then the pressing ring (7) is pressed on one side of the support ring (5) to clamp and fix the two ends of the flexible sand-proof mesh net (1). The assembly bolts (10) are used to fit and fix the pressing ring (7) and the support ring (5); Step 2: An anchor rod (13) is positioned and inserted in the positioning connection block (8) through a restraining block (14) that can be telescopically moved up and down. At this time, the restraining block (14) is inserted in the restraining groove (17) of the anchor rod (13). The anchor rod (13) can only push the restraining block (14) to move toward the outside of the cylinder composed of the flexible sand-proof dense mesh (1); Step 3: When the control rod (18) moves downward, the support push rod (20) moves downward synchronously, and the anchor rod (13) cannot move downward. At this time, the support push rods (20) push the anchor rods (13) toward the inner wall of the bored pile wellhead (3) and anchor them, so that the flexible sand-proof mesh (1) covers the sand layer (4) area.

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