Construction method of high-pressure jet grouting pile water-stop curtain to treat large-diameter pile foundation leakage on water

Abstract

The present application relates to the technical field of plugging pile foundation leakage, and proposes a construction method for treating large-diameter pile foundation leakage on water by using a high-pressure rotary jet pile water-stop curtain, comprising the following steps: S1: determining the rotary jet pile drilling hole position on the outer periphery of a steel casing and measuring and laying out the hole position; S2: placing the rotary jet drilling rig in position; S3: constructing an inner ring water-stop curtain: using a rotary jet drilling rig to inject mutually interlocking rotary jet piles around the outer periphery of the steel casing in a coarse sand layer to form an inner ring water-stop curtain; S4: constructing an outer ring water-stop curtain: using a rotary jet drilling rig to inject mutually interlocking rotary jet piles around the outer periphery of the inner ring water-stop curtain in a coarse sand layer to form an outer ring water-stop curtain; the bottom end of the rotary jet pile penetrates into the rock layer; S5: removing the rotary jet drilling rig; The present application has the effect of firmly plugging leakage channels such as springs in a coarse sand layer.

Description

Technical Field

[0001] The present application relates to the technical field of pile foundation leakage repair, and in particular to a construction method for treating large-diameter pile foundation leakage on water by using a high-pressure jet grouting water-stopping curtain. Background Art

[0002] When constructing a cross-sea bridge traditionally, since the seabed foundation is mainly composed of a rock layer and a covering layer covering the rock layer, wherein the covering layer is mainly composed of a coarse sand layer, and the geological structure stability is poor, in order to reduce the subsequent irregular settlement of the bridge foundation, it is usually necessary to first construct a number of bored cast-in-place piles on the foundation of the construction area to improve the overall strength of the foundation.

[0003] When constructing cast-in-place pile foundation, Figure 1 As shown, it is usually necessary to first build a construction platform 2 in the area to be reinforced, and then drive the steel casing 20 into the coarse sand layer 10 on the construction platform 2, and then drill the pile hole in the steel casing 20 by a drilling rig, and finally put a steel cage into the drilled hole and inject concrete to achieve the pouring of the bored pile.

[0004] In the actual construction process, since the coarse sand layer is prone to leakage channels such as springs, the pile foundation of the bored pile is prone to leakage during the drilling process. The current commonly used solution is the backfill wall building method, that is, backfilling stone and clay into the pile hole, compacting and compacting the wall to block the springs and other leakage channels. However, when the leakage channel is too large, coupled with the subsequent disturbance of the coarse sand layer soil by continued drilling, it is difficult to achieve a stable sealing of the leakage channel with the above method, and the problem of pile foundation leakage still exists, seriously affecting the subsequent overall construction progress of the pile foundation. Summary of the invention

[0005] In order to better deal with the situation of pile foundation leakage, the present application provides a construction method for treating the leakage of large-diameter pile foundation on water by using a high-pressure rotary jet pile water-stop curtain.

[0006] The construction method of the high-pressure jet grouting water-stopping curtain for treating the leakage of large-diameter pile foundation on water provided in this application adopts the following technical scheme:

[0007] A construction method for treating grout leakage of large-diameter pile foundation on water by using a high-pressure jet grouting water-stopping curtain comprises the following steps:

[0008] S1: Determine the drilling position of the jet grouting pile on the construction platform and measure and lay out the drilling position;

[0009] S2: Positioning the jet grouting drill: Move the jet grouting drill to the construction area, level the jet grouting drill and check and adjust the verticality of the drill rod of the jet grouting drill;

[0010] S3: Construction of inner ring water-stop curtain: Use a jet grouting rig to inject interlocking jet grouting piles around the outer circumference of the steel casing in the coarse sand layer to form an inner ring water-stop curtain; the bottom of the jet grouting piles penetrates into the rock layer;

[0011] S4: Construction of outer ring water-stop curtain: Use a jet grouting rig to inject mutually interlocking jet grouting piles around the outer periphery of the inner ring water-stop curtain in the coarse sand layer to form an outer ring water-stop curtain; the bottom of the jet grouting piles penetrates into the rock layer;

[0012] S5: Remove the jet grouting rig;

[0013] The jet grouting piles of the inner ring water-stopping curtain and the outer ring water-stopping curtain are arranged to interlock with each other.

[0014] By adopting the above technical scheme, an inner ring water-stop curtain and an outer ring water-stop curtain are applied on the outer periphery of the steel casing, and the leakage channel of the coarse sand layer is quickly and firmly blocked by the inner ring water-stop curtain and the outer ring water-stop curtain, which limits the leakage of the pile foundation during the drilling process, making the subsequent bored pile foundation construction less likely to be affected; and the strength enhancement block in the process of underwater rotary jet pile drilling can reinforce the soft soil of the coarse sand layer, which is beneficial to reduce the disturbance of the coarse sand layer caused by the subsequent bored piles during the secondary punching process; the rotary jet piles of the inner ring water-stop curtain and the outer ring water-stop curtain are interlocked with each other, which is beneficial to improve the connection integrity of the inner ring water-stop curtain and the outer ring water-stop curtain, and is beneficial to further realize the firm sealing of the leakage channel of the coarse sand layer.

[0015] Preferably, after the construction of step S1 is completed, the following steps are also included: laying an annular track on the construction platform, the annular track is coaxially arranged on the outer periphery of the steel casing; the annular track is slidably connected to a slide seat, the annular track is provided with a main drive component that drives the slide seat to slide along the annular track, the upper surface of the slide seat is also slidably connected to a support plate for placing a rotary jet drilling rig, the sliding direction of the support plate is parallel to the radial direction of the annular track, and the slide seat is also provided with an auxiliary drive component that drives the support plate to slide back and forth.

[0016] By adopting the above technical scheme, before the jet grouting drill constructs the jet grouting piles of the inner ring water-stop curtain, the jet grouting drill is moved to the support plate on the slide seat, the jet grouting drill is leveled and the verticality of the drill rod of the jet grouting drill is checked, and then the slide seat is driven by the main drive component to slide and cooperate with the auxiliary drive support plate to drive the jet grouting drill to move, so that the drill rod of the jet grouting drill is opposite to the drilling hole position of the jet grouting pile. After the subsequent single group of jet grouting piles are constructed, the slide seat is driven by the main drive component to drive the jet grouting drill to slide along the circular track, so that The rotary jet drilling rig can be quickly moved to the drilling position of the next rotary jet pile without repeatedly moving the rotary jet drilling rig to adjust the drill rod position, thereby facilitating the rapid construction of the inner ring water-stop curtain. At the same time, when subsequently constructing the rotary jet piles of the outer ring water-stop curtain, the auxiliary drive assembly can be used to drive the support plate to drive the rotary jet drilling rig to move away from the steel casing, so that the drill rod of the rotary jet drilling rig can be aligned with the drilling position of the rotary jet pile of the outer ring water-stop curtain, which is beneficial to improving the construction efficiency of the inner ring water-stop curtain and the outer ring water-stop curtain.

[0017] Preferably, the annular track includes an inner ring guide rail and an outer ring guide rail coaxially mounted on the outer periphery of the inner ring guide rail; the main drive assembly includes an annular rack coaxially fixed on the inner periphery of the inner ring guide rail, and the main drive assembly also includes a driving gear rotatably connected to the lower surface of the slide; the driving gear is meshed with the annular rack; a driving member for driving the driving gear to rotate is provided on the slide; the lower surface of the slide is also rotatably connected to a limiting wheel, the limiting wheel is axially vertically arranged and the limiting wheel abuts against the outer periphery of the outer ring guide rail.

[0018] By adopting the above technical scheme, the driving gear is driven to rotate by the driving member, so that the slide can be driven to drive the rotary jet drilling rig to move along the circular track, so that after the rotary jet drilling rig is used for rotary jetting, the rotary jet drilling rig can be quickly moved to the drilling position of the next rotary jet pile through the slide. The lower surface of the slide is also rotatably connected to the limiting wheel, and the limiting wheel abuts against the outer periphery of the outer guide rail, so that the slide is limited by the limiting wheel to leave the circular guide rail, so that the slide can slide more stably along the circular track.

[0019] Preferably, the annular track also includes a plurality of support tubes, which are located at the bottom of the annular track, are evenly distributed around the axis of the annular track, and the axial direction of the support tubes is parallel to the radial direction of the annular track, and the inner ring guide rail and the outer ring guide rail are respectively fixed at both ends of the support rod.

[0020] By adopting the above technical scheme and setting the support tube, on the one hand, it is convenient to improve the connection integrity between the inner guide rail and the outer guide rail through the support tube, so that the inner ring guide rail and the outer ring guide rail are not easy to be displaced and deformed; on the other hand, it is convenient to increase the contact area between the inner ring guide rail, the outer ring guide rail and the construction platform through a plurality of support tubes, so that the load acting on the inner ring guide rail and the outer ring guide rail by the slide and the rotary jet drilling rig can be transmitted to the construction platform through the support tube.

[0021] Preferably, the inner ring guide rail is formed by splicing a plurality of main arc-shaped rods, and the outer ring guide rail is formed by splicing a plurality of secondary arc-shaped rods.

[0022] By adopting the above technical solution, the inner guide rail and the outer guide rail do not need to be formed in one piece, which facilitates the processing and transportation of the annular rail.

[0023] Preferably, a positioning rod is slidably inserted into one end of the support tube facing the axis of the inner ring guide rail, a limiting rod is inserted into the outer periphery of the support tube, and the positioning rod is provided with a through hole for the limiting rod to pass through. When the limiting rods of several support tubes on the same main arc rod pass through the through holes on the corresponding positioning rods and the end of the positioning rod away from the support tube abuts against the outer periphery of the steel casing, the axis of the main arc rod coincides with the axis of the steel casing.

[0024] By adopting the above technical solution, when assembling the circular track, the positioning rod is slid until the through hole is opposite to the limit rod, and the limit rod is inserted into the through hole. Several main arc rods are hoisted onto the construction platform in turn and the end of the positioning rod away from the support tube is made to abut against the outer periphery of the steel casing. The above steps are repeated until the assembly of the circular track is completed, so that the axis of the circular track and the axis of the steel casing are coincident after the subsequent assembly of the circular track, and then the subsequent slide seat drives the rotary jet drilling rig to construct the rotary jet piles of the inner ring water-stop curtain and the outer ring water-stop curtain on the outer periphery of the steel casing.

[0025] Preferably, in steps S3 and S4, the jet grouting piles of the inner ring water-stopping curtain and the outer ring water-stopping curtain are both constructed by skip-hole construction.

[0026] The adoption of the above technical solution is helpful to reduce the occurrence of slurry mixing during the construction of adjacent jet grouting piles, and facilitates better forming of the jet grouting piles of the inner ring water-stop curtain and the outer ring water-stop curtain.

[0027] Preferably, the upper surfaces of both the main arc-shaped rod and the secondary arc-shaped rod are provided with a graphene coating.

[0028] By adopting the above technical solution and setting the graphene coating, it is helpful to reduce the friction between the upper surfaces of the main arc rod and the secondary arc rod and the slide seat, so that the slide seat can slide more smoothly and steadily on the annular guide rail.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. By constructing mutually interlocking jet grouting piles on the outer periphery of the steel casing to form an inner ring water-stop curtain and an outer ring water-stop curtain, the bottom ends of the jet grouting piles are all penetrated into the rock layer, and the outer ring water-stop curtain and the inner ring water-stop curtain are used to seal the leakage channel of the coarse sand layer. At the same time, the soil of the coarse sand layer can be reinforced during the jet grouting pile forming process, which is beneficial to reduce the disturbance of the coarse sand layer soil when the subsequent pile foundation continues to be drilled.

[0031] 2. By laying an annular track on the construction platform, the annular track is slidably connected with a slide seat, the annular track is provided with a main drive component that drives the slide seat to slide along the annular track, the slide seat is also slidably connected with a support plate, and the slide seat is provided with an auxiliary drive component that drives the support plate to slide; after the rotary jet drilling rig is moved to the support plate, the auxiliary drive component drives the support plate to drive the rotary jet drilling rig to move to the position where the drill rod of the rotary jet drilling rig is opposite to the rotary jet pile hole; after the rotary jet drilling rig constructs the rotary jet pile, the main drive component drives the slide seat to drive the rotary jet drilling rig to slide along the annular track, so that the drill rod of the rotary jet drilling rig can be quickly moved to the drilling hole position of the next rotary jet pile; it is convenient for the rapid construction of the inner ring water-stop curtain and the outer ring water-stop curtain.

[0032] 3. A positioning rod is slidably inserted through one end of the support tube toward the axis of the main arc rod, and a limiting rod is also inserted into the support tube. The positioning rod is provided with a limiting rod for the limiting rod to pass through. When the limiting rod passes through the through hole on the positioning rod and the end of the positioning rod away from the support tube abuts against the outer periphery of the steel casing, the axis of the main arc rod coincides with the axis of the steel casing, which is convenient for the rapid assembly and positioning of the annular track. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the state of the bored pile during construction according to an embodiment of the present application.

[0034] Figure 2 It is a schematic diagram of the embodiment of the present application used to illustrate the state of a rotary jet drilling rig when performing rotary jet jet pile construction.

[0035] Figure 3 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0036] Figure 4 It is a structural schematic diagram used to illustrate the lower surface of the slide seat in an embodiment of the present application.

[0037] Figure 5 yes Figure 2 Enlarged schematic diagram of part B in the middle.

[0038] Figure 6 It is a schematic diagram of the state of applying the inner ring water-stop curtain in an embodiment of the present application.

[0039] Figure 7 It is a schematic diagram of the state of applying the outer ring water-stop curtain in an embodiment of the present application.

[0040] Figure 8 It is a schematic diagram used to illustrate the positions of steel casing and rotary jet piles in an embodiment of the present application.

[0041] Description of reference numerals:

[0042] 1. Rock layer; 10. Coarse sand layer; 2. Construction platform; 20. Steel casing; 3. Jet-jet piles; 31. Inner ring water-stop curtain; 32. Outer ring water-stop curtain; 4. Jet-jet drilling rig; 5. Annular track; 50. Main connecting block; 51. Inner ring guide rail; 511. Main arc rod; 52. Outer ring guide rail; 521. Auxiliary arc rod; 53. Support pipe; 531. Limit rod; 54. Positioning rod; 55. Annular rack; 56. Driving gear; 57. Driving member; 6. Sliding seat; 61. Support plate; 611. Connecting plate; 62. Driving cylinder; 63. Limit wheel. DETAILED DESCRIPTION

[0043] The following is combined with Figure 2-8 This application is described in further detail.

[0044] The present application embodiment discloses a construction method for treating large diameter pile foundation leakage on water with a high pressure jet grouting water stop curtain, referring to Figure 2 and Figure 3 , including the following steps:

[0045] S1: Determine the drilling position of the jet grouting pile 3 on the construction platform 2 and measure and lay out the drilling position.

[0046] After step S1 is completed, an annular track 5 is laid on the construction platform 2. The annular track 5 is coaxially arranged on the outer periphery of the steel casing 20. The annular track 5 is slidably connected to the slide seat 6. The annular track 5 is also provided with a main driving component that drives the slide seat 6 to slide along the annular track 5. The upper surface of the slide seat 6 is also slidably connected to a support plate 61. In this embodiment, the support plate 61 is a patterned plate. The support plate 61 is slidably connected to the slide seat 6 through the slide rail slide seat 6. The support plate 61 is used to place the rotary drilling rig. The sliding direction of the support plate 61 is parallel to the radial direction of the annular track 5. The slide seat 6 is also provided with a secondary driving component that drives the support plate 61 to slide.

[0047] The auxiliary driving assembly includes two sets of driving oil cylinders 62 arranged in parallel on the upper surface of the slide 6. The two sets of driving oil cylinders 62 are respectively located on both sides of the support plate 61 and the axial direction of the driving oil cylinders 62 is parallel to the sliding direction of the support plate 61. Connecting plates 611 are fixed on opposite sides of the support plate 61, and the piston rods of the two sets of driving oil cylinders 62 are respectively fixed to the two sets of connecting plates 611. The driving oil cylinders 62 drive the piston rods to extend and retract to drive the support plate 61 to slide.

[0048] The annular track 5 includes an inner ring guide rail 51, an outer ring guide rail 52 and a plurality of support tubes 53. In this embodiment, the support tube 53 is a metal square tube, and the outer ring guide rail 52 is coaxially arranged on the outer periphery of the inner ring guide rail 51. The support tube 53 is located at the bottom of both the inner ring guide rail 51 and the outer ring guide rail 52. The plurality of support tubes 53 are evenly distributed around the axial direction of the inner ring guide rail 51, and the length direction of the support tube 53 is arranged parallel to the radial direction of the inner ring guide rail 51. Through the arrangement of the support tube 53, on the one hand, the connection integrity of the inner ring guide rail 51 and the outer ring guide rail 52 is improved, and at the same time, it is convenient to increase the contact area of ​​the inner ring guide rail 51 and the outer ring guide rail 52 with the construction platform 2 through the plurality of support tubes 53; it is convenient for the load transmitted to the annular track 5 by the subsequent slide 6 to be better transmitted to the construction platform 2.

[0049] Reference Figure 3 and Figure 4 The main driving assembly includes an annular rack 55 coaxially fixed on the inner circumference of the inner ring guide rail 51, and the main driving assembly also includes two sets of driving gears 56 rotatably connected to the lower surface of the slide 6. The driving gears 56 are all meshed with the annular rack 55. The slide 6 is provided with two sets of driving members 57 corresponding to the two sets of driving gears 56. The driving member 57 includes a driving motor installed on the slide 6, and the output end of the driving motor is coaxially fixed with the corresponding driving gear 56. The lower surface of the slide 6 is also rotatably connected with two sets of limiting wheels 63, which are axially vertically arranged, and the limiting wheels 63 are all in contact with the outer circumference of the outer ring guide rail 52, so that the slide 6 can be limited from leaving the annular track 5 by the limiting wheels 63, so that the slide 6 can slide along the annular track 5 more smoothly.

[0050] The inner ring guide 51 is composed of four groups of main arc rods 511, and the outer ring guide 52 is composed of four groups of secondary arc rods 521. The ring rack 55 is composed of four groups of arc rack segments; through the above arrangement, the ring track 5 does not need to be integrally formed, which is convenient for the manufacture and transportation of the ring track 5.

[0051] Reference Figure 2 and Figure 5 The ends of adjacent main arc rods 511 that are close to each other are each provided with a main connecting block 50, and the main connecting block 50 is located on the outer periphery of the main arc rod 511, and the main connecting blocks 50 at the ends of adjacent main arc rods 511 that are close to each other are connected by a bolt and nut pair; the ends of adjacent secondary arc rods 521 that are close to each other are each provided with a secondary connecting block, and the secondary connecting block is located on the inner periphery of the secondary arc rod 521, and the secondary connecting blocks at the ends of adjacent secondary arc rods 521 that are close to each other are connected by a bolt and nut pair; through the above arrangement, it is convenient to improve the connection integrity of adjacent main arc rods 511 and adjacent secondary arc rods 521.

[0052] The end of the support tube 53 facing the axial direction of the inner ring guide rail 51 is slidably inserted with a positioning rod 54, and a limiting rod 531 is also penetrated on the outer periphery of the support tube 53. The outer periphery of the positioning rod 54 is provided with a through hole for the limiting rod 531 to penetrate. When the limiting rods 531 of several support tubes 53 on the same main arc rod 511 are penetrated in the through holes of the corresponding positioning rods 54 and the ends of the positioning rods 54 away from the support tube 53 are all in contact with the steel casing 20, the axis of the main arc rod 511 coincides with the axis of the steel casing 20, which facilitates the rapid assembly and positioning of the annular track 5.

[0053] After the annular track 5 is assembled, the limiting rod 531 is moved out of the perforation of the positioning rod 54 and the positioning rod 54 is moved back to the support tube 53, so as to improve the overall strength of the support tube 53 through the positioning rod 54. At the same time, the support tube 53 is spot welded and fixed on the construction platform 2 to limit the displacement of the annular track 5.

[0054] The upper surfaces of the main arc rod 511 and the secondary arc rod 521 are coated with a graphene coating, which is beneficial to reducing the friction between the slide 6 and the annular track 5, thereby facilitating the slide 6 to slide on the annular track 5 more smoothly.

[0055] S2: The jet grouting drill 4 is positioned: the jet grouting drill 4 is moved to the construction area, the jet grouting drill 4 is leveled, and the verticality of the drill rod of the jet grouting drill 4 is checked and adjusted. The specific operation steps are as follows:

[0056] S2.1: Move the jet grouting drill 4 onto the support plate 61 of the slide 6;

[0057] S2.2: Level the jet grouting drill rig 4 and check and adjust the verticality of the drill rod.

[0058] Reference Figure 6 S3: Construction of the inner ring water-stopping curtain 31: The inner ring water-stopping curtain 31 is formed by injecting mutually interlocking jet grouting piles 3 around the steel casing 20 in the coarse sand layer 10 through the jet grouting drilling machine 4.

[0059] Reference Figure 7 S4: Construction of the outer ring water-stopping curtain 32: The outer ring water-stopping curtain 32 is formed by injecting mutually interlocking jet grouting piles 3 around the inner ring water-stopping curtain 31 in the coarse sand layer 10 through the jet grouting drilling machine 4.

[0060] Reference Figure 8 The bottom ends of the jet grouting piles 3 of the inner ring water-stopping curtain 31 and the outer ring water-stopping curtain 32 penetrate into the rock layer 1. The jet grouting piles 3 of the outer ring water-stopping curtain 32 and the inner ring water-stopping curtain 31 are interlocked with each other, which is convenient for improving the connection integrity of the outer ring water-stopping curtain 32 and the inner ring water-stopping curtain 31, and then it is convenient to more firmly seal and fill the leakage channel of the coarse sand layer 10.

[0061] The inner ring water-stop curtain 31 and the outer ring water-stop curtain 32 are both constructed by skipping holes during the construction of the jet grouting piles 3 , which is beneficial to reduce the occurrence of slurry mixing during the construction of adjacent jet grouting piles 3 , thereby facilitating better shaping of the jet grouting piles 3 .

[0062] Before the construction of the jet grouting pile 3, the main drive component drives the slide 6 to slide along the annular track 5 and cooperates with the auxiliary drive component to drive the support plate 61 to drive the jet grouting drill 4 to slide, so that the drill rod of the jet grouting drill 4 is opposite to the drilling hole position of a group of jet grouting piles 3. After the subsequent construction of a single jet grouting pile 3, the main drive component drives the slide 6 to drive the jet grouting drill 4 to slide along the annular track 5, so that the drill rod of the jet grouting drill 4 can be quickly opposite to the drilling hole position of the next jet grouting pile 3; there is no need to repeatedly move the jet grouting drill 4; it is convenient for the construction of the inner ring water-stop curtain 31 and the outer ring water-stop curtain 32 of the jet grouting pile 3.

[0063] After the jet grouting drill 4 has completed the drilling, it checks the hole position, hole depth and verticality. After they all meet the design and specification requirements, the jet grouting drill 4 starts the jetting operation. When the jet grouting drill 4 is operating, the drill operator is responsible for the operation control of the jetting direction, lifting speed, etc.; the mixer operator is responsible for operating the mixer to stir the slurry, and making original construction records such as the number of slurry barrels used for each hole, the amount of material per barrel, the mixing time, and the amount of cement used per unit time; the conveying equipment operator is responsible for the operation of the air compressor and high-pressure mud pump, and is responsible for recording the pressure and flow of the air and slurry, and notifying the foreman in time if any abnormality is found; the tester is responsible for the quality control of the slurry during construction and is responsible for on-site quality inspection.

[0064] S5: Remove the jet grouting drill 4.

[0065] The present application forms an inner ring water-stop curtain 31 and an outer ring water-stop curtain 32 by applying rotary jet piles 3 in the coarse sand layer 10, and utilizes the inner ring water-stop curtain 31 and the outer ring water-stop curtain 32 to quickly and firmly block leakage channels such as springs in the coarse sand layer 10. At the same time, the rotary jet piles 3 are used to reinforce the soil of the coarse sand layer 10 during the formation, which helps to reduce the disturbance of the soil of the coarse sand layer 10 in the subsequent pile foundation drilling process.

[0066] By setting an annular track 5, the annular track 5 is slidably connected with a slide 6, and the annular track 5 is provided with a main driving component that drives the slide 6 to slide along the annular track 5; the slide 6 is also slidably connected with a support plate 61, and the slide 6 is provided with an auxiliary driving component that drives the support plate 61 to slide; after the rotary jet drilling rig 4 is placed on the support plate 61, after the subsequent single group of rotary jet piles 3 are constructed, the slide 6 is driven by the main driving component to drive the support plate 61 and the rotary jet drilling rig 4 to slide along the annular track 5, so that the drill rod of the rotary jet drilling rig 4 can be made opposite to the drilling hole position of the next rotary jet pile 3, which is convenient for the construction of the inner ring water-stop curtain 31 and the outer ring water-stop curtain 32.

[0067] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A construction method for treating large-diameter pile foundation leakage on water by using a high-pressure jet grouting water-stopping curtain, characterized in that: The following steps are involved: S1: determining the drilling positions of the jet grouting piles (3) on the construction platform (2) and measuring and laying out the drilling positions; S2: The jet grouting drill (4) is positioned: the jet grouting drill (4) is moved to the construction area, the jet grouting drill (4) is leveled, and the verticality of the drill rod of the jet grouting drill (4) is checked and adjusted; S3: Construction of the inner ring water-stop curtain (31): The inner ring water-stop curtain (31) is formed by injecting mutually interlocking jet piles (3) around the outer circumference of the steel casing (20) in the coarse sand layer (10) through a jet grouting drill (4); the bottom end of the jet grouting pile (3) penetrates into the rock layer (1); S4: Construction of the outer ring water-stop curtain (32): The outer ring water-stop curtain (32) is formed by injecting mutually interlocking jet piles (3) around the outer periphery of the inner ring water-stop curtain (31) in the coarse sand layer (10) by means of a jet grouting drill (4); the bottom end of the jet grouting pile (3) penetrates into the rock layer (1); S5: Remove the jet grouting drill (4); The jet grouting piles (3) of the inner ring water-stopping curtain (31) and the outer ring water-stopping curtain (32) are arranged to engage with each other; After the construction of step S1 is completed, the following steps are also included: laying an annular track (5) on the construction platform (2), wherein the annular track (5) is coaxially arranged on the outer periphery of the steel casing (20); the annular track (5) is slidably connected to a slide seat (6), and the annular track (5) is provided with a main driving component for driving the slide seat (6) to slide along the annular track (5); the upper surface of the slide seat (6) is also slidably connected to a support plate (61) for placing a rotary jet drilling rig (4), and the sliding direction of the support plate (61) is parallel to the radial direction of the annular track (5), and the slide seat (6) is also provided with a secondary driving component for driving the support plate (61) to slide back and forth.

2. The construction method of high-pressure jet grouting pile water-stopping curtain for treating large-diameter pile foundation leakage on water according to claim 1 is characterized in that: The annular track (5) comprises an inner ring guide rail (51) and an outer ring guide rail (52) coaxially mounted on the outer periphery of the inner ring guide rail (51); the main drive assembly comprises an annular rack (55) coaxially fixed on the inner periphery of the inner ring guide rail (51), and the main drive assembly further comprises a driving gear (56) rotatably connected to the lower surface of the slide seat (6); the driving gear (56) is meshed with the annular rack (55); a driving member (57) for driving the driving gear (56) to rotate is arranged on the slide seat (6); the lower surface of the slide seat (6) is also rotatably connected to a limiting wheel (63), the limiting wheel (63) is axially vertically arranged and the limiting wheel (63) abuts against the outer periphery of the outer ring guide rail (52).

3. The construction method of high-pressure jet grouting pile water-stopping curtain for treating large-diameter pile foundation leakage on water according to claim 2 is characterized in that: The annular track (5) further comprises a plurality of support tubes (53), the plurality of support tubes (53) being located at the bottom of the annular track (5), the plurality of support tubes (53) being evenly distributed around the axis of the annular track (5), and the axial direction of the support tubes (53) being parallel to the radial direction of the annular track (5), and the inner ring guide rail (51) and the outer ring guide rail (52) being respectively fixed at two ends of the support rod.

4. The construction method of high-pressure jet grouting pile water-stopping curtain for treating large-diameter pile foundation leakage on water according to claim 3 is characterized by: The inner ring guide rail (51) is formed by splicing a plurality of main arc-shaped rods (511), and the outer ring guide rail (52) is formed by splicing a plurality of secondary arc-shaped rods (521).

5. The construction method of high-pressure jet grouting pile water-stopping curtain for treating large-diameter pile foundation leakage on water according to claim 4 is characterized in that: A positioning rod (54) is slidably inserted at one end of the support tube (53) facing the axis of the inner ring guide rail (51), a limiting rod (531) is inserted at the outer periphery of the support tube (53), and the positioning rod (54) is provided with a through hole for the limiting rod (531) to penetrate. When the limiting rods (531) of a plurality of support tubes (53) on the same main arc rod (511) penetrate into the through holes on the corresponding positioning rods (54) and the end of the positioning rod (54) away from the support tube (53) abuts against the outer periphery of the steel casing (20), the axis of the main arc rod (511) coincides with the axis of the steel casing (20).

6. The construction method of high-pressure jet grouting pile water-stopping curtain for treating large-diameter pile foundation grout leakage on water according to claim 5 is characterized in that: In steps S3 and S4, the jet grouting piles (3) of the inner ring water-stopping curtain (31) and the outer ring water-stopping curtain (32) are both constructed by skipping holes.

7. The construction method of high-pressure jet grouting pile water-stopping curtain for treating large-diameter pile foundation leakage on water according to claim 5, characterized in that: The upper surfaces of both the main arc-shaped rod (511) and the secondary arc-shaped rod (521) are provided with a graphene coating.

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