A full-rotation double-casing construction tool and method for ultra-deep fluidized silt soil layers

Abstract

The present invention relates to the technical field of building construction, and specifically to a full-rotation double-casing construction tool and method for ultra-deep flow plastic silt soil layers. The full-rotation double-casing construction tool for ultra-deep flow plastic silt soil layers includes: a waterproof groove, a waterproof positioning block, a sealing strip, a connecting rod, and a connecting groove; The beneficial effects are as follows: The lower limit block is pushed by the top spring into the lower limit groove to limit the movement ring clockwise. When the lower limit block is located inside the top groove, the top spring pushes the upper limit block into the upper limit groove to limit the movement ring clockwise, so that the limit insertion rod locks and limits the connecting rod, preventing the two outer sleeves from loosening, and facilitating the connection of the two outer sleeves. The split outer sleeves facilitate the transportation and turnover of the outer sleeves, saving the time for connecting the outer sleeves, thereby improving the construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a fully rotary double-casing construction tool and method for an ultra-deep fluidized silt soil layer. Background Art

[0002] In the original quarry and other ultra-deep areas, many areas backfilled the silt generated during river dredging and construction site garbage soil. As the city gradually expanded to the surrounding urban areas, the original quarry and other areas were replanned and rebuilt. The backfilled silt has high water retention and still has high flow plasticity after several years. In such complex address conditions, pile foundation construction needs to solve the hole formation problem. In this case, the advantages of the full-revolving full-casing construction process can be brought into play. The full-revolving full-casing construction process has the advantages of fast construction efficiency and good pile quality. It has been applied in various types of buildings in recent years.

[0003] However, the existing full-rotation machinery uses an outer casing and an inner casing. The outer casing is responsible for penetrating a certain length of rock in the fluidized muddy soil layer, separating the outer silt from the internal space of the outer casing to ensure that the silt on the outer casing does not flow into the casing. The inner casing is responsible for acting as a template and is responsible for the concrete molding of the bored pile. The full-rotation drilling rig applies torque and pressure to the outer casing, so that the outer casing gradually enters the soil layer and finally penetrates a certain length of rock. The inner casing reaches the design elevation position in the cavity formed by the outer casing, and then the steel cage, conduit, concrete and other construction work are completed. The outer casing has a thick wall. If the outer casing is integrated, it is difficult to transport and circulate. If it is split, it is mostly connected by bolts, which not only affects the flatness of the inner wall of the outer casing, but also takes a lot of time to connect the outer casing, increasing the construction period. Summary of the invention

[0004] The purpose of the present invention is to provide a fully-rotating double-casing construction tool and method for ultra-deep fluidized silt soil layers, so as to solve the problem that the outer casing is difficult to transport and circulate because it is integrally formed.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A fully rotary double-casing construction tool for ultra-deep flow-plastic silt soil layer, the fully rotary double-casing construction tool for ultra-deep flow-plastic silt soil layer comprising:

[0007] A waterproof groove is provided on the bottom surface of the outer casing;

[0008] A waterproof positioning block is fixed on the top surface of the outer sleeve;

[0009] The sealing strip is fixed on the top surface of the outer sleeve and is located on both sides of the waterproof positioning block;

[0010] The connecting rods are fixed on the top surface of the waterproof positioning block, and are provided in multiple groups and distributed in a circle with the axis of the outer sleeve as the center;

[0011] The connecting groove is arranged on the innermost surface of the waterproof groove and corresponds to the connecting rod one by one.

[0012] Preferably, the cross-sections of the waterproof groove and the waterproof positioning block are both isosceles trapezoidal structures, and the waterproof positioning block and the waterproof groove are both annular structures, and the outermost end of the connecting rod is provided with a positioning chamfer, the cross-section of the connecting groove is a "匚"-shaped structure, and a waterproof sealing film is laid on the surface of the waterproof positioning block.

[0013] Preferably, a plug-in groove is provided on the surface of the connecting groove, the plug-in groove is an arc-shaped structure, and the plug-in groove passes through the connecting groove, and the plug-in groove is coaxially arranged with the outer sleeve, and a guide groove is provided on one side surface of the plug-in groove, and the guide groove passes through the outer sleeve.

[0014] Preferably, a limiting rod is arranged inside the plug-in slot, and a connecting hole is arranged on the surface of the connecting rod. The connecting hole passes through the connecting rod, and the connecting hole and the limiting rod are coaxially arranged with the outer sleeve, and the limiting rod and the connecting hole have the same diameter, and the limiting rod cooperates with the connecting hole to limit the connecting rod.

[0015] Preferably, a movable ring is sleeved on the outside of the outer sleeve, and the cross-section of the movable ring is an isosceles trapezoidal structure, and the inclined surface is arranged toward the outside of the outer sleeve, and a guide rod is arranged inside the guide groove, one end of the guide rod is connected to the limiting plug rod, and the other end is connected to the inner wall of the movable ring, and an anti-skid groove is opened on the outer surface of the movable ring, and multiple groups of anti-skid grooves are provided, and are distributed in a circle with the axis line of the outer sleeve as the center of the circle.

[0016] Preferably, a sliding limit groove is provided on the outer surface of the outer sleeve, the sliding limit groove is located on the upper and lower sides of the plug-in groove, and a sliding limit block is fixed inside the movable ring, the sliding limit block is located inside the sliding limit groove, and the cross-sections of the sliding limit block and the sliding limit groove are both "T"-shaped, and the sliding limit groove is an annular structure, and the sliding limit block is an arc-shaped structure, and the sliding limit block and the sliding limit groove cooperate to limit the rotation of the movable ring.

[0017] Preferably, an upper limit groove is provided on the surface of the sliding limit groove away from the plug-in groove, a lower limit groove is provided on the surface of the sliding limit groove close to the plug-in groove, and top holding grooves are provided on the upper and lower end surfaces of the sliding limit block, and the cross-sections of the lower limit groove, the upper limit groove and the top holding groove are all in the shape of a "匚" character.

[0018] Preferably, a holding spring and an upper limiting block are arranged inside the holding groove at one end of the sliding limiting block close to the upper limiting groove. One end of the holding spring is connected to the upper limiting block, and the other end is connected to the holding groove. A holding spring and a lower limiting block are arranged inside the holding groove at one end of the sliding limiting block close to the lower limiting groove. One end of the holding spring is connected to the lower limiting block, and the other end is connected to the holding groove. Limiting inclined surfaces are formed on the surfaces of the upper limiting block and the lower limiting block, and the limiting inclined surfaces face the counterclockwise direction.

[0019] Preferably, multiple groups of the upper limiting grooves, upper limiting blocks, lower limiting grooves and lower limiting blocks are provided. The upper limiting grooves and the lower limiting grooves are arranged in an alternating manner, and the upper limiting blocks and the lower limiting blocks are arranged in an alternating manner. The holding spring holds the upper limiting block to cooperate with the upper limiting groove, and the holding spring holds the lower limiting block to cooperate with the lower limiting groove.

[0020] A full-rotation double-casing construction method for ultra-deep fluidized silt soil layers includes the following steps:

[0021] Preparation work: leveling the site, measuring the pile position, and positioning the full-rotation drilling rig;

[0022] Drilling start: Hoist the outer casing with a cutting edge into the central position of the full-rotation drilling rig. Through the torque and pressure applied by the full-rotation drilling rig, the outer casing gradually enters the soil layer.

[0023] Outer casing extension and soil extraction by rotary drilling: During the full-rotation drilling process, stop drilling after leaving a certain height of the outer casing above the full-rotation platform, and extend the outer casing.

[0024] By aligning two sets of outer sleeves to be connected through the cooperation of connecting rods and connecting grooves, then inserting the connecting rod of one set of outer sleeves into the connecting groove of the other set of outer sleeves, the positioning chamfer is convenient for positioning and inserting the connecting rod until the two sets of outer sleeves are fitted. The contact surface of the two sets of outer sleeves is sealed and waterproofed through the cooperation of the sealing strip, waterproof positioning block and waterproof groove. Then, the movable ring is rotated counterclockwise through the anti-slip groove, so that the movement of the movable ring drives the guide rod and the limit insertion rod to move, making the limit insertion rod rotate around the axis line of the outer sleeve, and the limit insertion rod passes through the connecting hole to limit and fix the connecting rod, thereby connecting the two sets of outer sleeves. When the movable ring rotates, the rotation of the movable ring is limited through the cooperation of the sliding limit groove and the sliding limit block, and the limit inclined surface on the surface of the upper limit block contacts the sliding limit groove, so that the upper limit block is pressed into the holding groove. The limit inclined surface on the surface of the lower limit block contacts the sliding limit groove, so that the lower limit block is pressed into the holding groove. And the upper limit groove and the lower limit groove are arranged staggeredly, and the upper limit block and the lower limit block are arranged staggeredly. When the upper limit block is located inside the holding groove, the holding spring presses the lower limit block into the lower limit groove to limit the movable ring clockwise. When the lower limit block is located inside the holding groove, the holding spring presses the upper limit block into the upper limit groove to limit the movable ring clockwise, so that the limit insertion rod locks and fixes the connecting rod, preventing the two sets of outer sleeves from loosening and facilitating the connection of the two sets of outer sleeves;

[0025] Then continue to start the full rotation for drilling. However, as the length of the outer sleeve entering the soil layer increases, the frictional force it receives from the soil layer will also increase. At this time, it is necessary to cooperate with a rotary drilling rig to remove some of the soil inside the outer sleeve to reduce the frictional force between the outer sleeve and the soil. Repeat the processes of drilling, lengthening, and soil removal until the designed required length is reached;

[0026] Outer sleeve entering rock: According to the design requirements, the outer sleeve needs to enter the rock for a certain length in the flowing plastic silty soil layer to separate the outer silt from the inner space of the outer sleeve and ensure that the outer silt outside the outer sleeve will not flow into the inner part of the sleeve;

[0027] Rotary drilling into rock: According to the design requirements, the bored cast-in-place pile needs to enter the rock for a certain length to meet the design bearing capacity requirements, and a rotary drilling rig is used to gradually remove the rock;

[0028] Hole cleaning: After the depth of rotary drilling into the rock meets the design requirements, the inside of the outer sleeve is cleaned to ensure that the sediment thickness meets the requirements;

[0029] Inner sleeve installation and lengthening: After the hole cleaning is completed, the inner sleeve is installed. The installation process requires the cooperation of a crawler crane. The connection sections of the inner sleeve are welded, and the weld form is a single-sided V-shaped groove. The lengthening work is repeated until its length reaches the design requirements;

[0030] Lower steel cage and pouring: Lower the fabricated steel cage and use the conduit method to pour the cast-in-place pile. After pouring is completed, pull out the conduit. During the concrete pouring process, observe whether the steel cage floats and control the pulling-out time of the conduit.

[0031] Pull out the outer casing: After the concrete is poured, the outer casing needs to be pulled out in a timely manner. The pulling-out process is the opposite of the drilling process. The outer casing is gradually pulled out by the torque and pulling force applied by the full rotation. During the pulling-out process of the outer casing, observe whether the inner casing floats and control the distance between the inner and outer casings to avoid the inner and outer casings sticking together and the situation where the inner casing floats when the outer casing is pulled out.

[0032] Full-rotation drilling rig displacement and grouting: After all the outer casings are pulled out, it means that the cast-in-place pile has been poured. At this time, the full-rotation rig can be transferred to the next cast-in-place pile by a crawler crane. After the full-rotation drilling rig is displaced, the gap formed between the inner and outer casings in the miscellaneous fill and part of the silt is grouted with cement slurry.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] In the present invention, two groups of outer casings to be connected are aligned by the cooperation of the connecting rod and the connecting groove. Then, the connecting rod of one group of outer casings is inserted into the connecting groove of the other group of outer casings. The positioning chamfer is convenient for positioning and inserting the connecting rod until the two groups of outer casings are fitted. The contact surface of the two groups of outer casings is sealed and waterproofed by the cooperation of the sealing strip and the waterproof positioning block with the waterproof groove. Then, the movable ring is rotated counterclockwise through the anti-slip groove, so that the movement of the movable ring drives the guide rod and the limit insertion rod to move, making the limit insertion rod rotate around the axis of the outer casing, and the limit insertion rod passes through the connecting hole to limit and fix the connecting rod, thereby connecting the two groups of outer casings. When the movable ring rotates, the rotation of the movable ring is limited by the cooperation of the sliding limit groove and the sliding limit block. And the limit inclined surface on the surface of the upper limit block contacts the sliding limit groove, so that the upper limit block is pressed into the top holding groove. The limit inclined surface on the surface of the lower limit block contacts the sliding limit groove, so that the lower limit block is pressed into the top holding groove. And the upper limit groove and the lower limit groove are arranged in a staggered manner, and the upper limit block and the lower limit block are arranged in a staggered manner, so that when the upper limit block is located in the top holding groove, the top holding spring presses the lower limit block into the lower limit groove to limit the movable ring clockwise. When the lower limit block is located in the top holding groove, the top holding spring presses the upper limit block into the upper limit groove to limit the movable ring clockwise, so that the limit insertion rod locks and fixes the connecting rod, preventing the two groups of outer casings from loosening, and facilitating the connection of the two groups of outer casings. The split outer casing is convenient for the transportation and turnover of the outer casing, saving the time for connecting the outer casings, thereby improving the construction efficiency. Description of the Drawings

[0035] Figure 1 It is the front view three-dimensional structure schematic diagram of the present invention;

[0036] Figure 2 It is a schematic perspective view of the upward view structure of the present invention;

[0037] Figure 3 It is a schematic perspective view of the upward view sectional structure of the present invention;

[0038] Figure 4 It is a schematic perspective view of the front view sectional structure of the present invention;

[0039] Figure 5 is Figure 4 an enlarged schematic view of the structure at A;

[0040] Figure 6 It is a schematic perspective view of the partial sectional structure of the present invention;

[0041] Figure 7 It is a schematic perspective view of the downward view sectional structure of the present invention;

[0042] Figure 8 It is a schematic perspective view of the movable ring of the present invention;

[0043] Figure 9 It is a schematic perspective view of the sliding limit block of the present invention.

[0044] In the figure: outer sleeve 1, movable ring 2, sealing strip 3, waterproof positioning block 4, connecting rod 5, connecting hole 6, positioning chamfer 7, anti-slip groove 8, waterproof groove 9, connecting groove 10, guiding groove 11, guiding rod 12, inserting groove 13, limiting insertion rod 14, sliding limit groove 15, sliding limit block 16, upper limit groove 17, upper limit block 18, holding groove 19, holding spring 20, lower limit groove 21, limiting inclined surface 22, lower limit block 23. Detailed implementation manners

[0045] In order to clearly and completely describe the purpose, technical solution of the present invention, and make the advantages more clear, the following further details the embodiments of the present invention 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, rather than all of the embodiments, 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 those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] For the sake of simplicity and illustration, the principles of the embodiments are mainly described by referring to examples. In the following description, many specific details are set forth in order to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures are not described in detail to avoid unnecessarily obscuring these embodiments. Additionally, all embodiments can be used in combination with each other.

[0049] Please refer to Figures 1 to 9 , the present invention provides a technical solution:

[0050] A full-rotation double-casing construction tool for ultra-deep fluidized silt layers. The full-rotation double-casing construction tool for ultra-deep fluidized silt layers includes: a waterproof groove 9 opened on the bottom surface of the outer casing 1; a waterproof positioning block 4 fixed on the top surface of the outer casing 1; a sealing strip 3 fixed on the top surface of the outer casing 1 and located on both sides of the waterproof positioning block 4; a connecting rod 5 fixed on the top surface of the waterproof positioning block 4, with multiple groups provided and distributed circumferentially around the axis of the outer casing 1; a connecting groove 10 opened on the innermost surface of the waterproof groove 9 and corresponding to the connecting rod 5 one by one; both the waterproof groove 9 and the waterproof positioning block 4 have an isosceles trapezoidal cross-sectional structure, and both the waterproof positioning block 4 and the waterproof groove 9 are annular structures, and the outermost end of the connecting rod 5 is provided with a positioning chamfer 7, the cross-section of the connecting groove 10 is in a "C" shape structure, and a waterproof sealing film is laid on the surface of the waterproof positioning block 4; an insertion slot 13 is opened on the surface of the connecting groove 10, the insertion slot 13 is in an arc shape structure and penetrates through the connecting groove 10, and the insertion slot 13 is coaxial with the outer casing 1, a guiding groove 11 is opened on one side surface of the insertion slot 13 and penetrates through the outer casing 1.

[0051] The present invention can be further arranged such that a limiting insertion rod 14 is provided inside the insertion slot 13, a connection hole 6 is opened on the surface of the connecting rod 5, the connection hole 6 penetrates through the connecting rod 5, and both the connection hole 6 and the limiting insertion rod 14 are coaxial with the outer casing 1, and the diameters of the limiting insertion rod 14 and the connection hole 6 are equal, and the limiting insertion rod 14 and the connection hole 6 cooperate to limit the connecting rod 5; a movable ring 2 is sleeved outside the outer casing 1, the cross-section of the movable ring 2 is in an isosceles trapezoidal structure and the inclined surface faces the outside of the outer casing 1, a guiding rod 12 is provided inside the guiding groove 11, one end of the guiding rod 12 is connected to the limiting insertion rod 14, the other end is connected to the inner wall of the movable ring 2, and multiple anti-slip grooves 8 are opened on the outer surface of the movable ring 2 and are distributed circumferentially around the axis of the outer casing 1.

[0052] The present invention can be further arranged such that a sliding limiting groove 15 is opened on the outer surface of the outer casing 1, the sliding limiting groove 15 is located on the upper and lower sides of the insertion slot 13, and a sliding limiting block 16 is fixed inside the movable ring 2, the sliding limiting block 16 is located inside the sliding limiting groove 15, and both the cross-sections of the sliding limiting block 16 and the sliding limiting groove 15 are in a "T" shape structure, and the sliding limiting groove 15 is in an annular structure, the sliding limiting block 16 is in an arc shape structure, and the sliding limiting block 16 and the sliding limiting groove 15 cooperate to limit the rotation of the movable ring 2; an upper limiting groove 17 is opened on the surface of the sliding limiting groove 15 away from the insertion slot 13, a lower limiting groove 21 is opened on the surface of the sliding limiting groove 15 close to the insertion slot 13, holding grooves 19 are opened on the upper and lower end surfaces of the sliding limiting block 16, and the cross-sections of the lower limiting groove 21, the upper limiting groove 17 and the holding groove 19 are all in a "C" shape structure.

[0053] The present invention can be further configured such that a holding spring 20 and an upper limit block 18 are provided inside a holding groove 19 at one end of the sliding limit block 16 close to the upper limit groove 17. One end of the holding spring 20 is connected to the upper limit block 18, and the other end is connected to the holding groove 19. A holding spring 20 and a lower limit block 23 are provided inside the holding groove 19 at one end of the sliding limit block 16 close to the lower limit groove 21. One end of the holding spring 20 is connected to the lower limit block 23, and the other end is connected to the holding groove 19. Limiting inclined surfaces 22 are provided on the surfaces of both the upper limit block 18 and the lower limit block 23, and the limiting inclined surfaces 22 face the counterclockwise direction. Multiple groups of the upper limit groove 17, the upper limit block 18, the lower limit groove 21, and the lower limit block 23 are provided, and the upper limit groove 17 and the lower limit groove 21 are arranged in an alternating manner, and the upper limit block 18 and the lower limit block 23 are arranged in an alternating manner. The holding spring 20 holds the upper limit block 18 to cooperate with the upper limit groove 17, and the holding spring 20 holds the lower limit block 23 to cooperate with the lower limit groove 21.

[0054] A construction method for a full-rotation double casing in an ultra-deep fluidized silt layer includes the following steps:

[0055] Preparation work: Level the site, measure the pile position, and position the full-rotation drilling rig.

[0056] Start drilling: Lift the outer casing 1 with a blade into the center position of the full-rotation drilling rig. Through the torque and pressure applied by the full-rotation drilling rig, the outer casing 1 gradually enters the soil layer.

[0057] Lengthen the outer casing 1 and use a rotary drilling rig to extract soil: During the full-rotation drilling process, stop drilling after leaving a certain height of the outer casing 1 above the full-rotation platform, and lengthen the outer casing 1.

[0058] By aligning two sets of outer sleeves 1 to be connected through the cooperation of the connecting rod 5 and the connecting groove 10, then inserting the connecting rod 5 of one set of outer sleeves 1 into the connecting groove 10 of the other set of outer sleeves 1, the positioning chamfer 7 facilitates the positioning and insertion of the connecting rod 5 until the two sets of outer sleeves 1 are in contact. The contact surface of the two sets of outer sleeves 1 is sealed and waterproofed through the cooperation of the sealing strip 3, the waterproof positioning block 4 and the waterproof groove 9. Then, the movable ring 2 is rotated counterclockwise through the anti-slip groove 8, so that the movement of the movable ring 2 drives the guide rod 12 and the limit insertion rod 14 to move, making the limit insertion rod 14 rotate around the axis line of the outer sleeve 1, and the limit insertion rod 14 passes through the connection hole 6 to limit and fix the connecting rod 5, thereby connecting the two sets of outer sleeves 1. When the movable ring 2 rotates, the rotation of the movable ring 2 is limited through the cooperation of the sliding limit groove 15 and the sliding limit block 16, and the limit inclined surface 22 on the surface of the upper limit block 18 contacts the sliding limit groove 15, thereby pressing the upper limit block 18 into the holding groove 19. The limit inclined surface 22 on the surface of the lower limit block 23 contacts the sliding limit groove 15, so that the lower limit block 23 is pressed into the holding groove 19. And the upper limit groove 17 and the lower limit groove 21 are arranged in an alternating manner, and the upper limit block 18 and the lower limit block 23 are arranged in an alternating manner. When the upper limit block 18 is located inside the holding groove 19, the holding spring 20 presses the lower limit block 23 into the lower limit groove 21 to limit the movable ring 2 clockwise. When the lower limit block 23 is located inside the holding groove 19, the holding spring 20 presses the upper limit block 18 into the upper limit groove 17 to limit the movable ring 2 clockwise, so that the limit insertion rod 14 locks the connecting rod 5 in position, preventing the two sets of outer sleeves 1 from loosening, and facilitating the connection of the two sets of outer sleeves 1;

[0059] Then continue to start the full rotation for drilling. However, as the length of the outer sleeve 1 entering the soil layer increases, the frictional force it receives from the soil layer will also increase. At this time, it is necessary to cooperate with a rotary drilling rig to remove some of the soil inside the outer sleeve 1 to reduce the frictional force between the outer sleeve 1 and the soil. Drill, extend, and take soil repeatedly until the design requirement length is reached;

[0060] Penetration of the outer sleeve 1 into the rock: According to the design requirements, the outer sleeve 1 needs to penetrate into the rock for a certain length in the flowing plastic silty soil layer to cut off the outside silt from the inner space of the outer sleeve 1 and ensure that the silt outside the outer sleeve 1 does not flow into the casing;

[0061] Rotary drilling into the rock: According to the design requirements, the bored cast-in-place pile needs to penetrate into the rock for a certain length to meet the design bearing capacity requirements, and a rotary drilling rig is used to gradually remove the rock;

[0062] Hole cleaning: After the depth of rotary drilling into the rock meets the design requirements, the inside of the outer sleeve 1 is cleaned to ensure that the sediment thickness meets the requirements;

[0063] Inner casing installation and elongation: After the hole cleaning is completed, the inner casing is installed. The installation process requires the cooperation of a crawler crane. The connection sections of the inner casing are welded, and the weld form is a single-sided V-groove. The elongation work is carried out repeatedly to make its length meet the design requirements;

[0064] Lowering the steel cage and pouring: Lower the fabricated steel cage and use the conduit method to pour the cast-in-place pile. After pouring is completed, pull out the conduit. During the concrete pouring process, observe whether the steel cage floats and control the pulling-out time of the conduit;

[0065] Pulling out outer casing 1: After the concrete is poured, the outer casing 1 needs to be pulled out in time. The pulling-out process is opposite to the drilling process. The outer casing 1 is gradually pulled out by the torque and pulling force applied by the full rotation. During the pulling-out process of the outer casing 1, observe whether the inner casing floats and control the distance between the inner and outer casings 1 to avoid the situation where the inner and outer casings 1 are in close contact and the inner casing floats when the outer casing 1 is pulled out;

[0066] Full-rotation drilling rig relocation and grouting: After all the outer casing 1 is pulled out, it means that the cast-in-place pile has been poured. At this time, the crawler crane can be used to transfer the full-rotation rig to the location of the next cast-in-place pile. After the full-rotation drilling rig is relocated, the gap formed between the inner and outer casings 1 in the miscellaneous fill and part of the silt is grouted with cement slurry.

[0067] By aligning two sets of outer sleeves 1 to be connected through the cooperation of the connecting rod 5 and the connecting groove 10, then inserting the connecting rod 5 of one set of outer sleeves 1 into the connecting groove 10 of the other set of outer sleeves 1, the positioning chamfer 7 facilitates the positioning and insertion of the connecting rod 5 until the two sets of outer sleeves 1 are in contact. The contact surface of the two sets of outer sleeves 1 is sealed and waterproofed through the cooperation of the sealing strip 3, the waterproof positioning block 4 and the waterproof groove 9. Then, the movable ring 2 is rotated counterclockwise through the anti-slip groove 8, so that the movement of the movable ring 2 drives the guide rod 12 and the limit insertion rod 14 to move, making the limit insertion rod 14 rotate around the axis line of the outer sleeve 1, and the limit insertion rod 14 passes through the connection hole 6 to limit and fix the connecting rod 5, thereby connecting the two sets of outer sleeves 1. When the movable ring 2 rotates, the rotation of the movable ring 2 is limited through the cooperation of the sliding limit groove 15 and the sliding limit block 16, and the limit inclined surface 22 on the surface of the upper limit block 18 contacts the sliding limit groove 15, thereby pressing the upper limit block 18 into the top holding groove 19. The limit inclined surface 22 on the surface of the lower limit block 23 contacts the sliding limit groove 15, so that the lower limit block 23 is pressed into the top holding groove 19. And the upper limit groove 17 and the lower limit groove 21 are arranged in a staggered manner, and the upper limit block 18 and the lower limit block 23 are arranged in a staggered manner. When the upper limit block 18 is located inside the top holding groove 19, the top holding spring 20 pushes the lower limit block 23 into the lower limit groove 21 to limit the clockwise rotation of the movable ring 2. When the lower limit block 23 is located inside the top holding groove 19, the top holding spring 20 pushes the upper limit block 18 into the upper limit groove 17 to limit the clockwise rotation of the movable ring 2, so that the limit insertion rod 14 locks and fixes the connecting rod 5, preventing the two sets of outer sleeves 1 from loosening, and facilitating the connection of the two sets of outer sleeves 1. The split outer sleeve 1 facilitates the transportation and turnover of the outer sleeve 1, saves the time for connecting the outer sleeve 1, and thus improves the construction efficiency.

[0068] Although the above-described illustrative specific embodiments of the present application have been described to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all application creations using the concept of the present application are within the scope of protection.

Claims

1. A fully rotating double-casing construction tool for ultra-deep flow-plastic silt soil layers. Features: The ultra-deep flow plastic silt soil layer full-rotation double casing construction tool comprises: A waterproof groove (9) is provided on the bottom surface of the outer sleeve (1); A waterproof positioning block (4) fixed on the top surface of the outer sleeve (1); A sealing strip (3) is fixed to the top surface of the outer sleeve (1) and is located on both sides of the waterproof positioning block (4); The connecting rods (5) are fixed on the top surface of the waterproof positioning block (4), and are provided in multiple groups and distributed in a circle with the axis of the outer sleeve (1) as the center; The connecting groove (10) is provided on the innermost surface of the waterproof groove (9) and corresponds to the connecting rod (5) one by one. The surface of the connecting groove (10) is provided with a plug-in groove (13). The plug-in groove (13) is in an arc-shaped structure and penetrates the connecting groove (10). The plug-in groove (13) and the outer sleeve (1) are coaxially arranged. A guide groove (11) is provided on one side surface of the plug-in groove (13), and the guide groove (11) penetrates the outer sleeve (1); a limit plug-in rod (14) is arranged inside the plug-in groove (13), and a connecting hole (6) is provided on the surface of the connecting rod (5). The connecting hole (6) penetrates the connecting rod (5), and the connecting hole (6) and the limit plug-in rod (14) are arranged. 4) are coaxially arranged with the outer sleeve (1), and the limit rod (14) and the connecting hole (6) have the same diameter, and the limit rod (14) and the connecting hole (6) cooperate to limit the connecting rod (5); the outer side of the outer sleeve (1) is sleeved with a movable ring (2), the cross section of the movable ring (2) is an isosceles trapezoidal structure, and the inclined surface is arranged toward the outside of the outer sleeve (1), and a guide rod (12) is arranged inside the guide groove (11), one end of the guide rod (12) is connected to the limit rod (14), and the other end is connected to the inner wall of the movable ring (2), and the outer surface of the movable ring (2) is provided with an anti-skid groove (8), and the anti-skid groove (8) is provided in multiple groups and is distributed in a circle with the axis of the outer sleeve (1) as the center.

2. A fully rotating double-casing construction tool for ultra-deep fluidized mud layers according to claim 1, Features: The cross-sections of the waterproof groove (9) and the waterproof positioning block (4) are both isosceles trapezoidal structures, and the waterproof positioning block (4) and the waterproof groove (9) are both annular structures, and the outermost end of the connecting rod (5) is provided with a positioning chamfer (7), the cross-section of the connecting groove (10) is a "匚"-shaped structure, and the surface of the waterproof positioning block (4) is paved with a waterproof sealing film.

3. A fully rotating double-casing construction tool for ultra-deep plastic mud soil layer according to claim 2, Features: The outer surface of the outer sleeve (1) is provided with a sliding limit groove (15), the sliding limit groove (15) is located at the upper and lower sides of the plug-in groove (13), and a sliding limit block (16) is fixed inside the movable ring (2), the sliding limit block (16) is located inside the sliding limit groove (15), and the cross-sections of the sliding limit block (16) and the sliding limit groove (15) are both "T"-shaped structures, and the sliding limit groove (15) is an annular structure, and the sliding limit block (16) is an arc-shaped structure, and the sliding limit block (16) cooperates with the sliding limit groove (15) to limit the rotation of the movable ring (2).

4. A fully rotating double-casing construction tool for ultra-deep fluidized silt soil layer according to claim 3, Features: An upper limit groove (17) is formed on the surface of the sliding limit groove (15) on the side away from the plug-in groove (13), a lower limit groove (21) is formed on the surface of the sliding limit groove (15) on the side close to the plug-in groove (13), and a top holding groove (19) is formed on the upper and lower end surfaces of the sliding limit block (16), and the cross sections of the lower limit groove (21), the upper limit groove (17) and the top holding groove (19) are all in the shape of a Chinese character "匚".

5. A fully rotating double-casing construction tool for ultra-deep plastic mud soil layer according to claim 4, Features: A supporting groove (19) near one end of the sliding limit block (16) close to the upper limit groove (17) is provided with a supporting spring (20) and an upper limit block (18); one end of the supporting spring (20) is connected to the upper limit block (18), and the other end is connected to the supporting groove (19); a supporting groove (19) near one end of the sliding limit block (16) close to the lower limit groove (21) is provided with a supporting spring (20) and a lower limit block (23); one end of the supporting spring (20) is connected to the lower limit block (23), and the other end is connected to the supporting groove (19); and the upper limit block (18) and the lower limit block (23) are provided with limiting inclined surfaces (22) on their surfaces, and the limiting inclined surfaces (22) face counterclockwise.

6. A fully rotating double-casing construction tool for ultra-deep plastic mud layers according to claim 5, Features: The upper limit slot (17), the upper limit block (18), the lower limit slot (21) and the lower limit block (23) are all provided in multiple groups, and the upper limit slot (17) and the lower limit slot (21) are arranged in a staggered manner, and the upper limit block (18) and the lower limit block (23) are arranged in a staggered manner, and the supporting spring (20) supports the upper limit block (18) to cooperate with the upper limit slot (17), and the supporting spring (20) supports the lower limit block (23) to cooperate with the lower limit slot (21).

7. A construction method for a full-rotation double-casing construction tool for ultra-deep fluidized silt soil layer according to any one of claims 1 to 6, Features: The following steps are involved: Preparation work: level the site, measure the pile position, and put the full-rotation drilling rig in place; Drilling: The outer casing (1) with a blade is hoisted into the center of the full-rotation drilling rig, and the outer casing (1) gradually enters the soil layer through the torque and pressure applied by the full-rotation drilling rig; Extension of the outer casing (1) and soil excavation by a rotary drilling rig: During the full rotation drilling process, when a certain height of the outer casing (1) on the upper part of the full rotation platform is left, the drilling stops, and the outer casing (1) is extended; By aligning two groups of outer casings (1) to be connected through the cooperation of the connecting rod (5) and the connecting groove (10), then inserting the connecting rod (5) of one group of outer casings (1) into the connecting groove (10) of the other group of outer casings (1). The positioning chamfer (7) facilitates the positioning and insertion of the connecting rod (5) until the two groups of outer casings (1) are in contact. The contact surface of the two groups of outer casings (1) is sealed and waterproofed through the cooperation of the sealing strip (3), the waterproof positioning block (4) and the waterproof groove (9). Then, the movable ring (2) is rotated counterclockwise through the anti-slip groove (8), so that the movement of the movable ring (2) drives the guide rod (12) and the limit insertion rod (14) to move, making the limit insertion rod (14) rotate around the axis line of the outer casing (1), and the limit insertion rod (14) passes through the connecting hole (6) to limit and fix the connecting rod (5), thereby connecting the two groups of outer casings (1). When the movable ring (2) rotates, the rotation of the movable ring (2) is limited through the cooperation of the sliding limit groove (15) and the sliding limit block (16). And the limit inclined surface (22) on the surface of the upper limit block (18) contacts the sliding limit groove (15), so that the upper limit block (18) is pressed into the holding groove (19). The limit inclined surface (22) on the surface of the lower limit block (23) contacts the sliding limit groove (15), so that the lower limit block (23) is pressed into the holding groove (19). And the upper limit groove (17) and the lower limit groove (21) are arranged in a staggered manner, and the upper limit block (18) and the lower limit block (23) are arranged in a staggered manner. When the upper limit block (18) is located inside the holding groove (19), the holding spring (20) holds the lower limit block (23) into the lower limit groove (21) to limit the clockwise rotation of the movable ring (2). When the lower limit block (23) is located inside the holding groove (19), the holding spring (20) holds the upper limit block (18) into the upper limit groove (17) to limit the clockwise rotation of the movable ring (2), so that the limit insertion rod (14) locks and limits the connecting rod (5) to prevent the two groups of outer casings (1) from loosening and facilitating the connection of the two groups of outer casings (1); Then continue to start the full rotation for drilling. However, as the length of the outer casing (1) entering the soil layer increases, the frictional force it receives from the soil layer will also increase. At this time, a rotary drilling rig needs to be used in cooperation to take out some of the soil inside the outer casing (1) to reduce the frictional force between the outer casing (1) and the soil. Repeat the drilling, extension, and soil extraction in this way until the designed required length is reached; Penetration of the outer casing (1) into the rock: According to the design requirements, in the flowing plastic silty soil layer, the outer casing (1) needs to penetrate into the rock for a certain length to separate the outer silt from the inner space of the outer casing (1) to ensure that the outer silt outside the outer casing (1) will not flow into the casing; Penetration of the rotary drilling rig into the rock: According to the design requirements, the bored cast-in-place pile needs to penetrate into the rock for a certain length to meet the design bearing capacity requirements, and a rotary drilling rig is used to gradually take out the rock; Hole cleaning: After the rotary drilling depth into the rock meets the design requirements, clean the inside of the outer casing (1) to ensure that the sediment thickness meets the requirements; Inner casing installation and extension: After hole cleaning, install the inner casing. The installation process requires the cooperation of a crawler crane. The connection sections of the inner casing are welded using a single-sided V-shaped groove for the weld form. Repeat the extension work until its length reaches the design requirements; Lowering the steel cage and pouring: Lower the fabricated steel cage and use the conduit method to pour the cast-in-place pile. After pouring, pull out the conduit. During the concrete pouring process, observe whether the steel cage floats and control the pulling-out time of the conduit; Pulling out the outer casing (1): After pouring the concrete, promptly pull out the outer casing (1). The pulling-out process is the opposite of the drilling process. The outer casing (1) is gradually pulled out by the torque and pulling force applied by full rotation. During the pulling-out process of the outer casing (1), observe whether the inner casing floats and control the distance between the inner and outer casings (1) to avoid the situation where the inner and outer casings (1) are in close contact and the inner casing floats when the outer casing (1) is pulled out; Full-rotation drill rig relocation and grouting: After all the outer casings (1) are pulled out, it means that the cast-in-place pile has been poured. At this time, use a crawler crane to transfer the full-rotation drill rig to the location of the next cast-in-place pile. After the full-rotation drill rig is relocated, grout the gap formed between the inner and outer casings (1) in the miscellaneous fill and part of the silt with cement slurry.

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