Long spiral jet grouting pile drilling rig and its construction technology

Abstract

The present invention relates to the technical field of building construction equipment, specifically to a long spiral jet grouting pile drilling rig and a construction process thereof, comprising a crawler frame, a winch and a connecting arm, wherein a connecting portion fixed on the connecting arm is rotatably connected to the crawler frame, and further comprising: a spiral jet grouting drill, wherein the spiral jet grouting drill is connected to the winch via a traction cable; a locking mechanism, wherein the locking mechanism comprises a pushing assembly and a locking piece, wherein the locking piece cooperates with an engaging portion provided on the connecting portion to lock the position state of the connecting arm; the pushing assembly comprises a driven structure and a guide plate; an adjusting mechanism, which is arranged on the crawler frame and connected to the spiral jet grouting drill, wherein the adjusting mechanism comprises a conducting assembly, an expansion assembly and two groups of symmetrically arranged blocking plates, wherein after the driven structure cooperates with the guide plate to drive the locking piece to move into the engaging portion, the expansion assembly can drive the blocking plate to move, thereby reducing the load of the hydraulic cylinder while changing the cement pumping speed.

Description

Technical Field

[0001] The invention relates to the technical field of building construction devices, in particular to a long spiral jet grouting pile drilling machine and a construction process thereof. Background Art

[0002] Cement-soil mixing piles are widely used in soft soil foundation treatment, foundation pit support and water-stop curtains due to their simple construction and low cost.

[0003] However, the existing cement-soil mixing piles are mostly carried out in a step-by-step manner, that is, they are divided into two steps: hole drilling and cement slurry injection, which leads to a long construction period. For this reason, a long spiral jet jet pile drilling rig is introduced to synchronize the hole drilling and cement slurry injection. However, the injection amount of cement slurry needs to be regulated separately, and the hole drilling speed needs to be controlled according to the parameters determined by the pile-making process test based on the formation conditions. If the cement slurry is pumped in too fast a speed, it will cause slurry return at the hole mouth, and if it is too slow, it will affect the engineering quality of the cement-soil mixing pile.

[0004] Therefore, in the process of making cement-soil mixing piles, it is necessary to adjust the cement pumping volume in real time according to the hole-making speed. However, the hole-making speed and cement slurry pumping of the existing long spiral jet jet pile drilling rig are two independent systems. During operation, real-time matching is required, which increases the difficulty of the operation and easily leads to uneven quality of cement-soil mixing piles. Summary of the invention

[0005] The object of the present invention is to provide a long spiral jet grouting pile drilling rig and a construction process thereof to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A long spiral jet pile drilling machine comprises: a crawler frame, a winch and a connecting arm, wherein a connecting part fixed on the connecting arm is rotatably connected to the crawler frame;

[0008] Also includes:

[0009] A spiral jet grouting drill is arranged on the connecting arm, the spiral jet grouting drill is connected to the hoist through a traction cable, and the hoist can drive the spiral jet grouting drill to move along the length direction of the connecting arm by releasing or winding up the traction cable;

[0010] A locking mechanism is formed between the connecting portion and the crawler frame and connected to the winch, the locking mechanism includes a push assembly and a locking member, the locking member cooperates with a fitting portion provided on the connecting portion to lock the position state of the connecting arm;

[0011] The push assembly includes a driven structure and a guide plate, and the driven structure cooperates with the guide plate to drive the locking member to move toward the engaging portion;

[0012] An adjusting mechanism is arranged on the crawler frame and is connected to the spiral jet grouting drill. The adjusting mechanism includes a conduction component, an expansion component and two groups of symmetrically arranged blocking plates. After the driven structure cooperates with the guide plate to drive the locking piece to move into the engaging portion, the expansion component can drive the blocking plate to move to change the conduction amount of the conduction component.

[0013] As a further solution of the present invention: the spiral jet grouting drilling tool comprises a mounting frame connected to the traction cable and slidably arranged on the connecting arm, a driving motor is fixed on the mounting frame, and an output shaft of the driving motor passes through the mounting frame and is connected to a composite drill bit;

[0014] The interior of the composite drill bit is a hollow structure, and the upper part of the composite drill bit is a long spiral drill rod, and the lower part is a stirring rotary jet drill bit. The stirring rotary jet drill bit is circumferentially provided with at least one stirring blade, and the stirring rotary jet drill bit is provided with a high-pressure nozzle that connects the inside and outside of the stirring rotary jet drill bit.

[0015] As a further solution of the present invention: the driven structure includes a rotating rod rotatably mounted on the crawler frame, the rotating rod is connected to the winch through a transmission belt, and a follower is fixed to one end of the rotating rod away from the crawler frame, two No. 1 slide grooves are symmetrically arranged on the follower, a No. 1 slider is slidably mounted in the No. 1 slide groove, the No. 1 slider is connected to the energy storage kit arranged inside the rotating rod, and a counterweight is fixed to the No. 1 slider;

[0016] The driven structure also includes two cross plates which are symmetrically arranged and connected to the energy storage kit, the cross plates are connected to a cross sliding kit arranged on the crawler frame, the cross sliding kit is rollingly connected to the guide plate and can drive the locking member to move.

[0017] As a further solution of the present invention: the interior of the rotating rod is a hollow structure, and the rotating rod is provided with four groups of through slots along its length direction;

[0018] The energy storage kit includes a lifting member slidably arranged in the rotating rod, the lifting member passes through the through slot and is connected to the horizontal plate, and a connecting rod passing through the through slot is rotatably mounted on the lifting member, and one end of the connecting rod away from the lifting member is rotatably connected to the first slider;

[0019] The energy storage kit also includes a spring arranged inside the rotating rod, one end of the spring is connected to the lifting member, and the other end of the spring is connected to the inner wall of the rotating rod.

[0020] As a further solution of the present invention: the cross sliding kit includes a No. 2 slide groove arranged on the two transverse plates, a No. 2 slider is slidably installed in the No. 2 slide groove, and the two No. 2 sliders are connected by a connecting rod, and three groups of No. 1 pulleys are equidistantly arranged on the connecting rod;

[0021] The cross sliding kit also includes a fixed sleeve connected to the crawler frame, a push rod connected to the locking member is slidably installed in the fixed sleeve, a follower plate perpendicular to the push rod is fixed on the push rod, and the follower plate is provided with a No. 3 slide groove along its length direction, and one group of the No. 1 pulleys can roll in the No. 3 slide groove.

[0022] As a further solution of the present invention: the guide plates are provided in two groups and fixed on the crawler frame, and the guide plates are provided with a vertical slot body and a first inclined slot body, and the vertical slot body is smoothly connected to the first inclined slot body;

[0023] The vertical trough body and the No. 1 inclined trough body form a guide groove, and the other two groups of No. 1 pulleys can roll in the guide groove.

[0024] As a further solution of the present invention: the conduction assembly includes a lower exploration groove arranged along the length direction of the connecting arm, a follower block rotatably connected to the long spiral drill rod is slidably installed in the lower exploration groove, a conduction connection seat is arranged in the follower block, and the conduction connection seat is connected to the flow box fixed on the connecting arm through a conduit;

[0025] The conduction assembly further comprises a plurality of conduction openings arranged along the circumferential direction of the long spiral drill rod, and the conduction connection seat covers the plurality of conduction openings.

[0026] As a further solution of the present invention: the blocking plate is arranged in the circulation box and is slidably fitted with the upper top of the circulation box;

[0027] The expansion assembly includes an adjustment plate connected to the blocking plate, and a second inclined slot is provided on the adjustment plate;

[0028] The expansion assembly also includes a plurality of vertical poles symmetrically arranged on the circulation box body, and a connecting sleeve is slidably installed on the vertical poles. The plurality of connecting sleeves are connected by a horizontal plate, and a second pulley capable of rolling in the second inclined trough body is rotatably installed on the horizontal plate, and the horizontal plate is adapted to a bracket connecting the two second sliders.

[0029] A construction process using the long spiral jet grouting pile drilling rig comprises the following steps:

[0030] Step 1: Measure, lay out and determine the pile position: Before placing the curtain pile, expose the pile heads of the slope protection piles. According to the requirements of the pile position design drawings, measure and set the pile axis and positioning points. Steel bars with a diameter of not less than Ф25 can be used to drive holes with a depth of not less than 300mm at the pile position, fill them with white lime and insert steel bars to mark the pile position;

[0031] Step 2: Drilling rig in place: Install spiral jet grouting tools of appropriate length according to the pile length, connect them firmly, and after the drilling rig is positioned, the four legs are supported steadily to keep the connecting arm vertical. The verticality of the spiral jet grouting tools is controlled by the double-line hammer equipped by the drilling rig itself and the level ruler on the drilling rig. The verticality deviation is not more than 0.5%. If necessary, a theodolite is used to assist in monitoring. After the drilling rig is positioned, a re-inspection is carried out. The deviation between the drill tip and the pile point shall not be greater than 20mm. Before starting the drilling rig, the soil blocks in the drill rod and drill tip should be cleaned;

[0032] Step 3: Drilling: Start the spiral jet drilling tool to drill the hole. When it just touches the ground, the drilling speed should be slow. The drilling speed should be strictly controlled during construction. The drilling speed is controlled according to the parameters determined by the pile-forming process test based on the formation conditions. Stop drilling after reaching the design elevation end point;

[0033] Step 4: Preparation of cement slurry: Measure the weight of water and cement according to the designed water-cement ratio, which should be 1.0-1.5. Stir evenly in a slurry mixing bucket, filter through a 60-mesh sieve, and put into a slurry storage tank. Place a slurry pump in the slurry storage tank to stir the cement slurry continuously to prevent the cement slurry from settling. Cover the grouting pump head with a fine-mesh gauze cover to prevent the inhalation of coarse particles and block the drill nozzle;

[0034] Step 5: Cement slurry jetting. The spiral jetting drill bit drills downwards and the grouting pump is started at the same time. High-pressure cement slurry is pumped into the spiral jetting drill bit and then into the hole. The pump pressure should be 20-30MPa. Stirring is performed while jetting. After feeding to the end point of the designed elevation, the drill bit is lifted at the designed lifting speed. At the same time, the jetting and stirring are stopped. When the cement slurry reaches the starting point of the designed elevation, the pumping and stirring of the cement slurry are stopped. In special cases such as sand and gravel layers, repeated jetting and stirring or fixed spraying are performed. Multiple stirring and spraying or fixed spraying are used to increase the pile diameter or the fixed spraying control width, thereby improving the water-stopping performance.

[0035] Step 6: Clean the spiral jet grouting drill and proceed to the next pile construction. After the spiral jet grouting drill is taken out, clean the loose soil on the spiral jet grouting drill, check and ensure that the nozzle on the drill bit is unobstructed, and then move to the next pile position to construct the next pile.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The spiral jet-jet drilling tool is set up so that the soil in the hole is not completely replaced, that is, part of the soil is taken from the hole, and there is little or no slurry return at the hole mouth, ensuring civilized construction on site. At the same time, the cement consumption is small, saving 15% of cement compared with ordinary deep mixing concrete piles and 50% of cement compared with jet-jet piles. Under the action of the high-pressure nozzle, the cutting and mixing capabilities of the composite drill bit are improved, and the hard soil layer can also be drilled quickly, greatly reducing its resistance to mixing and drilling, solving the problem of curtain construction in hard soil layers;

[0038] The locking mechanism can release the working state of the hydraulic rod when the spiral jet grouting drill is working, ensuring the stability of the angle state of the connecting arm and ensuring that the vibration of the connecting arm will not cause the loss of the seal inside the hydraulic rod. On the one hand, the stroke accuracy of the hydraulic rod is guaranteed, and on the other hand, the service life of the hydraulic rod is improved, making the operation stability of the hydraulic rod higher during the construction period.

[0039] By setting up the plugging assembly, on the one hand, the connecting arm is stabilized before cement slurry is pumped, thereby improving the stability of the locking part and the interlocking part when they are combined; on the other hand, due to the different hardness of the soil on the hole-making path, the pumping amount of cement slurry in the circulation box can be adjusted by changing the rotation speed of the winch, so that the pumping amount of cement slurry matches the drilling speed of the spiral jet drilling tool, avoiding excessive or insufficient cement slurry pumping, making the use of cement slurry more reasonable, and ensuring the engineering quality of the water-stop curtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The present invention is a schematic structural diagram of an embodiment of a long spiral jet grouting pile drilling rig.

[0041] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at point A in the middle.

[0042] Figure 3 It is a schematic structural diagram from another angle of an embodiment of a long spiral jet grouting pile drilling rig.

[0043] Figure 4 The present invention is a schematic structural diagram of a locking mechanism in one embodiment of a long spiral jet grouting pile drilling rig.

[0044] Figure 5 This is a schematic diagram of the internal structure of a rotating rod in an embodiment of a long spiral jet grouting pile drilling rig.

[0045] Figure 6 The present invention is a schematic structural diagram of a cross sliding kit in one embodiment of a long spiral jet grouting pile drilling rig.

[0046] Figure 7 The present invention is a schematic diagram of the structure of the adjustment mechanism in one embodiment of a long spiral jet grouting pile drilling rig.

[0047] Figure 8 This is a schematic diagram of the internal structure of a circulation box in an embodiment of a long spiral jet jet pile drilling rig.

[0048] Fig. 9 The present invention is a schematic diagram of the disassembly of a spiral jet grouting drill tool and a conductive connection seat in one embodiment of a long spiral jet grouting pile drilling rig.

[0049] In the figure: 1, crawler frame; 2, connecting arm; 201, lower exploration groove; 3, connecting part; 301, fitting part; 4, long spiral drill rod; 401, guide port; 5, stirring rotary jet drill; 501, stirring blade; 502, high-pressure nozzle; 6, winch; 7, transmission belt; 8, rotating rod; 9, through groove; 10, follower; 11, No. 1 slide; 12, No. 1 slider; 13, counterweight; 14, connecting rod; 15, lifting part; 16, spring; 17, cross plate; 18, No. 2 slide; 19, No. Slider; 20, pulley No. 1; 21, guide plate; 22, guide groove; 2201, vertical groove; 2202, inclined groove No. 1; 23, follower plate; 24, slide groove No. 3; 25, push rod; 26, fixed sleeve; 27, locking piece; 28, bracket; 29, circulation box; 30, conduit; 31, follower block; 32, conduction connection seat; 33, blocking plate; 34, adjustment plate; 35, inclined groove No. 2; 36, vertical rod; 37, connecting sleeve; 38, pulley No. 2; 39, horizontal plate. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0052] See also Figures 1 to 9 In an embodiment of the present invention, a long spiral jet grouting pile drilling machine comprises: a crawler frame 1, a winch 6 and a connecting arm 2, wherein a connecting portion 3 fixed on the connecting arm 2 is rotatably connected to the crawler frame 1;

[0053] It also includes: a spiral jet-jet drilling tool, a locking mechanism and an adjusting mechanism.

[0054] The spiral jet grouting drill is arranged on the connecting arm 2, and the spiral jet grouting drill is connected to the hoist 6 via a traction cable, and the hoist 6 can drive the spiral jet grouting drill to move along the length direction of the connecting arm 2 by releasing or winding up the traction cable;

[0055] The spiral jet grouting drilling tool comprises a mounting frame connected to the traction cable and slidably arranged on the connecting arm 2, a driving motor is fixed on the mounting frame, and an output shaft of the driving motor passes through the mounting frame and is connected to a composite drill bit;

[0056] The interior of the composite drill bit is a hollow structure, and the upper part of the composite drill bit is a long spiral drill rod 4, and the lower part is a stirring rotary jet drill bit 5. The stirring rotary jet drill bit 5 is circumferentially provided with at least one stirring blade 501, and the stirring rotary jet drill bit 5 is provided with a high-pressure nozzle 502 that connects the inside and the outside thereof.

[0057] When in use, the composite drill bit rotates and moves downward. During this process, the stirring rotary jet drill bit 5 cooperates with the long spiral drill rod 4 to perform a hole-making operation, and most of the soil in the hole remains in the air. At the same time, during the hole-making operation, cement slurry enters the interior of the composite drill bit and is sprayed into the hole by the high-pressure nozzle 502. The cement slurry is mixed with the soil in the hole and stirred and mixed by the stirring blades 501, thereby realizing the synchronous operation of rotary jetting and stirring, which has the characteristics of fast construction speed and short construction period.

[0058] Through the above arrangement, the soil in the hole is not completely replaced, that is, part of the soil is taken from the hole, and there is little or no slurry return at the hole mouth, thereby ensuring civilized construction on site. At the same time, the amount of cement used is small, which saves 15% of cement compared with ordinary deep mixing concrete piles and 50% of cement compared with rotary jet piles. Under the action of the high-pressure nozzle 502, the cutting and mixing capabilities of the composite drill bit are improved, and the hard soil layer can also be drilled quickly, which greatly reduces the resistance of its mixing and drilling, and solves the problem of curtain construction in hard soil layers.

[0059] See also Figure 1 , Figure 2 , Figures 4 to 6 The locking mechanism is formed between the connecting portion 3 and the crawler frame 1 and is connected to the hoist 6. The locking mechanism includes a push assembly and a locking member 27. The locking member 27 cooperates with the fitting portion 301 provided on the connecting portion 3 to lock the position state of the connecting arm 2.

[0060] The push assembly includes a driven structure and a guide plate 21, and the driven structure cooperates with the guide plate 21 to drive the locking member 27 to move toward the engaging portion 301;

[0061] The driven structure includes a rotating rod 8 rotatably mounted on the crawler frame 1, the rotating rod 8 is connected to the winch 6 through a transmission belt 7, and a follower 10 is fixed to the end of the rotating rod 8 away from the crawler frame 1, two No. 1 slide grooves 11 are symmetrically arranged on the follower 10, a No. 1 slider 12 is slidably installed in the No. 1 slide groove 11, the No. 1 slider 12 is connected to the energy storage kit arranged inside the rotating rod 8, and a counterweight 13 is fixed to the No. 1 slider 12, the energy storage kit includes a lifting member 15 slidably arranged in the rotating rod 8, the lifting member 15 passes through the through slot 9 and is connected to the cross plate 17, and a connecting rod 14 passing through the through slot 9 is rotatably mounted on the lifting member 15, and the end of the connecting rod 14 away from the lifting member 15 is rotatably connected to the No. 1 slider 12;

[0062] The energy storage kit further includes a spring 16 disposed inside the rotating rod 8, one end of the spring 16 is connected to the lifting member 15, and the other end is connected to the inner wall of the rotating rod 8;

[0063] The driven structure further comprises two transverse plates 17 symmetrically arranged and connected to the energy storage kit, the transverse plates 17 are connected to a cross sliding kit arranged on the crawler frame 1, the cross sliding kit is rollingly connected to the guide plate 21, and can drive the locking member 27 to move;

[0064] The interior of the rotating rod 8 is a hollow structure, and the rotating rod 8 is provided with four groups of through slots 9 along its length direction;

[0065] The cross sliding kit includes a No. 2 slide groove 18 arranged on the two transverse plates 17, a No. 2 slider 19 is slidably installed in the No. 2 slide groove 18, and the two No. 2 sliders 19 are connected by a connecting rod, and three groups of No. 1 pulleys 20 are equidistantly arranged on the connecting rod;

[0066] The cross sliding kit also includes a fixed sleeve 26 connected to the crawler frame 1, a push rod 25 connected to the locking member 27 is slidably installed in the fixed sleeve 26, a follower plate 23 perpendicular to the push rod 25 is fixed on the follower plate 23, and a third slide groove 24 is opened along the length direction of the follower plate 23, wherein a group of the first pulleys 20 can roll in the third slide groove 24;

[0067] The guide plates 21 are provided with two groups and fixed on the crawler frame 1, and a vertical groove body 2201 and a No. 1 inclined groove body 2202 are opened on the guide plate 21, and the vertical groove body 2201 and the No. 1 inclined groove body 2202 are smoothly connected, and the vertical groove body 2201 and the No. 1 inclined groove body 2202 form a guide groove 22, and the other two groups of the No. 1 pulley 20 can roll in the guide groove 22.

[0068] When the existing long spiral jet grouting pile drilling rig is in use, the crawler frame 1 and the connecting arm 2 are connected by a hydraulic rod. The angle of the connecting arm 2 is changed by the action of the hydraulic rod to keep the connecting arm 2 in a vertical state. A drilling tool is provided on the connecting arm 2. The drilling tool will generate vibration when working (caused by eccentric rotation, the drill bit encountering hard objects, etc.). In order to keep the position angle of the connecting arm 2 stable, the glaze liquid in the hydraulic rod is relatively high. At this time, the connecting arm 2 will cause the hydraulic rod to follow the vibration in the process of following the vibration of the drilling tool. If this continues for a long time, the seal in the hydraulic rod will be damaged, resulting in a change in the stroke of the hydraulic rod, causing a difference between the actual angle of the connecting arm 2 and the preset angle, thereby reducing the construction accuracy.

[0069] In the present invention, two output shafts are provided on the winch 6, one of which is used to reel in or release the traction cable, and the other drives the rotating rod 8 to rotate through the transmission belt 7. The rotational speeds of the two output shafts are positively correlated, and the rotational speed of the output shaft connected to the transmission belt 7 is higher than the rotational speed of the output shaft connected to the traction cable.

[0070] Specifically, when the winch 6 releases the traction cable to make the spiral jet drilling tool move downward, the winch 6 will synchronously drive the rotating rod 8 to rotate through the transmission belt 7. When the rotating rod 8 is in a stationary state, the lifting member 15 is at the lowest point of the stroke under the action of gravity and the spring 16. At the same time, the lifting member 15 makes the No. 1 slider 12 in the No. 1 slide groove 11 close to the end of the axis of the rotating rod 8 through the connecting rod 14. When the rotating rod 8 rotates, it will drive the follower 10 to rotate, and the No. 1 slider 12 and the counterweight block 13 will generate centrifugal force. Under the action of centrifugal force, the No. 1 slider 12 will move away from the rotating rod 8 in the No. 1 slide groove 11. At this time, the No. 1 slider 12 drives the lifting member 15 to move upward through the connecting rod 14 and compresses the spring 16. When the lifting member 15 moves upward, it can drive the cross plate 17 to move upward, thereby driving the No. 2 slider 19 to move upward. At the same time, because two sets of No. 1 pulleys 20 roll The first pulley 20 is arranged in the guide groove 22. When the second slider 19 moves upward, the first pulley 20 will move along the first inclined groove body 2202 and the vertical groove body 2201 in sequence. Specifically, in the initial stage of the horizontal plate 17 following the lifting member 15 to rise, the first pulley 20 will move along the first inclined groove body 2202. At this time, as the horizontal plate 17 rises, the second slider 19 will move along the second slide groove 18 away from one end of the lifting member 15, and the other group of the first pulley 20 is arranged in the third slide groove 24 on the follower plate 23, so that when the first pulley 20 moves in the first inclined groove body 2202, the follower plate 23 will move close to the connecting part 3, and when the first pulley 20 moves to the end of the first inclined groove body 2202, it drives the locking member 27 to be inserted into the interlocking part 301 in the connecting part 3 to lock the position of the connecting arm 2. At this time, the hydraulic rod stops working, and the angle state of the connecting arm 2 can still be kept stable.

[0071] Through the above-mentioned arrangement, the working state of the hydraulic rod can be released when the spiral jet grouting drill is working. While ensuring the stability of the angle state of the connecting arm 2, it is ensured that the vibration of the connecting arm 2 will not cause the loss of the seal inside the hydraulic rod. On the one hand, the stroke accuracy of the hydraulic rod is guaranteed, and on the other hand, the service life of the hydraulic rod is improved, so that the operation stability of the hydraulic rod during the construction period is higher.

[0072] Furthermore, when the number one pulley 20 moves into the vertical slot 2201, the number one pulley 20 can only be lifted vertically, while the locking member 27 can only move horizontally, that is, the movement directions of the two are perpendicular, so that when the number one pulley 20 is lifted vertically, the stability of the locking member 27 is guaranteed, ensuring that the locking member 27 will not be detached from the interlocking portion 301.

[0073] See also Figure 7 to Figure 9The adjusting mechanism is arranged on the crawler frame 1 and is connected to the spiral jet grouting drill. The adjusting mechanism includes a conduction component, an expansion component and two sets of symmetrically arranged blocking plates 33. After the driven structure cooperates with the guide plate 21 to drive the locking member 27 to move into the fitting portion 301, the expansion component can drive the blocking plate 33 to move to change the conduction amount of the conduction component;

[0074] The conduction assembly includes a lower exploration groove 201 arranged along the length direction of the connecting arm 2, a follower block 31 rotatably connected to the long spiral drill rod 4 is slidably installed in the lower exploration groove 201, a conduction connection seat 32 is arranged in the follower block 31, and the conduction connection seat 32 is connected to the flow box 29 fixed on the connecting arm 2 through a conduit 30;

[0075] The conduction assembly further includes a plurality of conduction openings 401 arranged along the circumferential direction of the long spiral drill rod 4, and the conduction connection seat 32 covers the plurality of conduction openings 401;

[0076] The blocking plate 33 is disposed in the circulation box 29 and is slidably fitted with the upper top of the circulation box 29;

[0077] The expansion component includes an adjustment plate 34 connected to the blocking plate 33, and a second inclined groove body 35 is opened on the adjustment plate 34. The expansion component also includes a plurality of vertical rods 36 symmetrically arranged on the circulation box body 29, and a connecting sleeve 37 is slidably installed on the vertical rods 36. The plurality of connecting sleeves 37 are connected by a horizontal plate 39, and a second pulley 38 capable of rolling in the second inclined groove body 35 is rotatably installed on the horizontal plate 39, and the horizontal plate 39 is adapted to the bracket 28 connecting the two second sliders 19.

[0078] When in use, the cement pump pumps cement slurry into the circulation box 29 and guides the cement slurry into the conductive connection seat 32 through the conduit 30. Then the cement slurry enters the spiral jet drilling tool through the conductive port 401.

[0079] In the initial state, the two blocking plates 33 cooperate with each other to block the discharge port of the circulation box 29. At this time, the water pump is in a stopped state. At the same time, the horizontal plate 39 is at the lowest point of the stroke due to the counterweight plate. In the initial state, the horizontal plate 39 and the bracket 28 are in a horizontally misaligned state, and there is a certain height difference between the two (the height difference is equal to the height difference between the head and tail ends of the No. 1 inclined trough 2202 in the vertical direction).

[0080] When the No. 1 pulley 20 rolls in the No. 1 inclined slot 2202, the No. 2 slider 19 produces a lateral displacement and a longitudinal displacement at the same time. When the No. 1 pulley 20 moves to the end of the stroke of the No. 1 inclined slot 2202, the bracket 28 will be located directly below the horizontal plate 39, and the bracket 28 and the horizontal plate 39 are in abutment state. At this time, as the lifting member 15 continues to rise, the No. 1 pulley 20 slides in the vertical slot 2201. Under the guidance of the vertical slot 2201, the position stability of the bracket 28 in the horizontal direction is guaranteed. At the same time, as the lifting member 15 rises, the bracket 28 will rise and push the horizontal plate 39 to rise. In the process of the horizontal plate 39 moving upward, the No. 2 pulley 38 will move vertically upward, and the No. 2 pulley 38 moves in the No. 2 inclined slot 35, so that when the No. 2 pulley 38 moves upward, the two adjustment plates 34 will move relative to each other and make the circulation box 29 conductive.

[0081] In detail, when the winch 6 is working, the output shaft thereof changes from a stationary state to a stable working state in a gradual process, that is, the rotation speed of the winch 6 will gradually increase. During this process, the No. 1 pulley 20 will move in the No. 1 inclined trough 2202 and the vertical trough 2201 respectively. When the No. 1 pulley 20 moves to the end of the No. 1 inclined trough 2202, the connecting arm 2 is locked. When the No. 1 pulley 20 moves, the end of the vertical trough 2201 is enabled to realize the conduction of the flow box 29. The purpose of such a setting is to improve the stability of the locking member 27 when combining with the interlocking portion 301 when the cement slurry is pumped after the connecting arm 2 is stabilized.

[0082] It should be noted that in the process of drilling holes with the spiral jet grouting drill, the drilling speed of the spiral jet grouting drill needs to be controlled according to the parameters determined by the pile forming process test based on the formation conditions. Specifically, in order to protect the drill bit, when the spiral jet grouting drill is drilling holes in harder soil, the drilling speed of the spiral jet grouting drill is slower. Conversely, when the spiral jet grouting drill is drilling holes in soft soil, the drilling speed of the spiral jet grouting drill is faster. At this time, the speed at which the winch 6 releases the traction cable will change accordingly, and the pumping amount of cement slurry for soils of different hardnesses is obviously different. An output shaft of the winch 6 is connected to the rotating rod 8. The change in the rotation speed of the winch 6 will cause the centrifugal force generated by the No. 1 slider 12 to be different, thereby causing the lifting amount of the bracket 28 to be different, and the conduction amount of the flow box 29 to change accordingly.

[0083] Through the above arrangement, on the one hand, the connecting arm 2 is stabilized before cement slurry is pumped, thereby improving the stability of the locking piece 27 when combined with the interlocking portion 301; on the other hand, due to the different hardness of the soil on the hole-making path, the pumping amount of cement slurry in the circulation box 29 can be adjusted by changing the rotation speed of the winch 6, so that the pumping amount of cement slurry matches the drilling speed of the spiral jet drilling tool, avoiding excessive or insufficient cement slurry pumping, making the use of cement slurry more reasonable, and ensuring the engineering quality of the water-stop curtain.

[0084] It is worth noting that the minimum rotation speed of the hoist 6 during operation should ensure that the locking member 27 can be inserted into the engaging portion 301 .

[0085] As an embodiment of the present invention, a construction process using the long spiral jet grouting pile drilling rig is also proposed, comprising the following steps:

[0086] Step 1: Measure, lay out and determine the pile position: Before placing the curtain pile, expose the pile heads of the slope protection piles. According to the requirements of the pile position design drawings, measure and set the pile axis and positioning points. Steel bars with a diameter of not less than Ф25 can be used to drive holes with a depth of not less than 300mm at the pile position, fill them with white lime and insert steel bars to mark the pile position;

[0087] Step 2: Drilling rig in place: Install a spiral jet grouting drill of appropriate length according to the pile length, connect firmly, after the drilling rig is positioned, the four legs are supported steadily, and the connecting arm 2 is kept vertical. The verticality of the spiral jet grouting drill is controlled by the double-line hammer equipped by the drilling rig itself and the level ruler on the drilling rig. The verticality deviation is not more than 0.5%. If necessary, a theodolite is used to assist in monitoring. After the drilling rig is positioned, a re-inspection is carried out. The deviation between the drill tip and the pile point shall not be greater than 20 mm. Before starting the drilling rig, the soil blocks in the drill rod and the drill tip should be cleaned;

[0088] Step 3: Drilling: Start the spiral jet drilling tool to drill the hole. When it just touches the ground, the drilling speed should be slow. The drilling speed should be strictly controlled during construction. The drilling speed is controlled according to the parameters determined by the pile-forming process test based on the formation conditions. Stop drilling after reaching the design elevation end point;

[0089] Step 4: Preparation of cement slurry: Measure the weight of water and cement according to the designed water-cement ratio, which should be 1.0-1.5. Stir evenly in a slurry mixing bucket, filter through a 60-mesh sieve, and put into a slurry storage tank. Place a slurry pump in the slurry storage tank to stir the cement slurry continuously to prevent the cement slurry from settling. Cover the grouting pump head with a fine-mesh gauze cover to prevent the inhalation of coarse particles and block the drill nozzle;

[0090] Step 5: Cement slurry jetting. The spiral jetting drill bit drills downwards and the grouting pump is started at the same time. High-pressure cement slurry is pumped into the spiral jetting drill bit and then into the hole. The pump pressure should be 20-30MPa. Stirring is performed while jetting. After feeding to the end point of the designed elevation, the drill bit is lifted at the designed lifting speed. At the same time, the jetting and stirring are stopped. When the cement slurry reaches the starting point of the designed elevation, the pumping and stirring of the cement slurry are stopped. In special cases such as sand and gravel layers, repeated jetting and stirring or fixed spraying are performed. Multiple stirring and spraying or fixed spraying are used to increase the pile diameter or the fixed spraying control width, thereby improving the water-stopping performance.

[0091] Step 6: Clean the spiral jet grouting drill and proceed to the next pile construction. After the spiral jet grouting drill is taken out, clean the loose soil on the spiral jet grouting drill, check and ensure that the nozzle on the drill bit is unobstructed, and then move to the next pile position to construct the next pile.

[0092] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0093] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A long spiral jet pile drilling rig, include: A crawler frame (1), a winch (6) and a connecting arm (2), wherein a connecting portion (3) fixed to the connecting arm (2) is rotatably connected to the crawler frame (1); It is characterized by further comprising: A spiral jet grouting drill is arranged on the connecting arm (2), the spiral jet grouting drill is connected to the hoist (6) via a traction cable, and the hoist (6) can drive the spiral jet grouting drill to move along the length direction of the connecting arm (2) by releasing or reeling in the traction cable; a locking mechanism formed between the connecting portion (3) and the crawler frame (1) and connected to the hoist (6), the locking mechanism comprising a push assembly and a locking member (27), the locking member (27) cooperating with a fitting portion (301) provided on the connecting portion (3) to lock the position state of the connecting arm (2); The push assembly comprises a driven structure and a guide plate (21), wherein the driven structure cooperates with the guide plate (21) to drive the locking member (27) to move toward the engaging portion (301); an adjusting mechanism, arranged on the crawler frame (1) and connected to the spiral jet grouting drill, the adjusting mechanism comprising a conduction component, an expansion component and two groups of symmetrically arranged blocking plates (33), after the driven structure cooperates with the guide plate (21) to drive the locking member (27) to move into the engaging portion (301), the expansion component can drive the blocking plate (33) to move, so as to change the conduction amount of the conduction component; The spiral jet grouting drilling tool comprises a mounting frame connected to the traction cable and slidably arranged on the connecting arm (2), a driving motor being fixed on the mounting frame, an output shaft of the driving motor passing through the mounting frame and being connected to a composite drill bit; The interior of the composite drill bit is a hollow structure, the upper part of the composite drill bit is a long spiral drill rod (4), and the lower part is a stirring rotary jet drill bit (5), the stirring rotary jet drill bit (5) is circumferentially provided with at least one stirring blade (501), and the stirring rotary jet drill bit (5) is provided with a high-pressure nozzle (502) that conducts the inside and outside of the stirring rotary jet drill bit (5); The driven structure comprises a rotating rod (8) rotatably mounted on the crawler frame (1), the rotating rod (8) being connected to the winch (6) via a transmission belt (7), and a follower (10) being fixed to one end of the rotating rod (8) away from the crawler frame (1), the follower (10) being symmetrically provided with two No. 1 slide grooves (11), a No. 1 slider (12) being slidably mounted in the No. 1 slide groove (11), the No. 1 slider (12) being connected to an energy storage kit arranged inside the rotating rod (8), and a counterweight (13) being fixed to the No. 1 slider (12); The driven structure further comprises two transverse plates (17) which are symmetrically arranged and connected to the energy storage kit, the transverse plates (17) being connected to a cross sliding kit arranged on the crawler frame (1), the cross sliding kit being rollingly connected to the guide plate (21) and being capable of driving the locking member (27) to move.

2. A long spiral jet grouting pile drilling rig according to claim 1, It is characterized in that The interior of the rotating rod (8) is a hollow structure, and the rotating rod (8) is provided with four groups of through slots (9) along its length direction; The energy storage kit comprises a lifting member (15) slidably arranged in the rotating rod (8), the lifting member (15) passes through the through slot (9) and is connected to the transverse plate (17), and a connecting rod (14) passing through the through slot (9) is rotatably mounted on the lifting member (15), and one end of the connecting rod (14) away from the lifting member (15) is rotatably connected to the first sliding block (12); The energy storage kit further comprises a spring (16) arranged inside the rotating rod (8), one end of the spring (16) being connected to the lifting member (15), and the other end of the spring (16) being connected to the inner wall of the rotating rod (8).

3. A long spiral jet grouting pile drilling rig according to claim 2, It is characterized in that The cross sliding kit comprises a No. 2 slide groove (18) arranged on the two transverse plates (17), a No. 2 slider (19) being slidably mounted in the No. 2 slide groove (18), the two No. 2 sliders (19) being connected via a connecting rod, and three groups of No. 1 pulleys (20) being equidistantly arranged on the connecting rod; The cross sliding kit also includes a fixed sleeve (26) connected to the crawler frame (1), a push rod (25) connected to the locking member (27) is slidably installed in the fixed sleeve (26), a follower plate (23) perpendicular to the push rod (25) is fixed on the push rod (25), and the follower plate (23) is provided with a third slide groove (24) along its length direction, and a group of the first pulleys (20) can roll in the third slide groove (24).

4. A long spiral jet grouting pile drilling rig according to claim 3, It is characterized in that The guide plates (21) are provided in two groups and are fixed on the crawler frame (1), and a vertical slot body (2201) and a first inclined slot body (2202) are provided on the guide plates (21), and the vertical slot body (2201) and the first inclined slot body (2202) are smoothly connected; The vertical trough body (2201) and the first inclined trough body (2202) form a guide groove (22), and the other two groups of the first pulleys (20) are capable of rolling in the guide groove (22).

5. A long spiral jet grouting pile drilling rig according to claim 3, It is characterized in that The conduction assembly comprises a lower exploration groove (201) arranged along the length direction of the connecting arm (2), a follower block (31) rotatably connected to the long spiral drill rod (4) is slidably installed in the lower exploration groove (201), a conduction connection seat (32) is arranged in the follower block (31), and the conduction connection seat (32) is connected to a flow box (29) fixed on the connecting arm (2) through a conduit (30); The conduction assembly further comprises a plurality of conduction openings (401) arranged along the circumferential direction of the long spiral drill rod (4), and the conduction connection seat (32) covers the plurality of conduction openings (401).

6. A long spiral jet grouting pile drilling rig according to claim 5, It is characterized in that The blocking plate (33) is arranged in the circulation box (29) and is slidably fitted with the upper top of the circulation box (29); The expansion assembly comprises an adjustment plate (34) connected to the blocking plate (33), and a second inclined slot (35) is provided on the adjustment plate (34); The expansion assembly further comprises a plurality of vertical rods (36) symmetrically arranged on the circulation box (29), a connecting sleeve (37) being slidably mounted on the vertical rods (36), the plurality of connecting sleeves (37) being connected via a horizontal plate (39), a second pulley (38) being rotatably mounted on the horizontal plate (39) and capable of rolling in the second inclined trough (35), and the horizontal plate (39) being adapted to a bracket (28) connecting the two second sliders (19).

7. A construction process using the long spiral jet grouting pile drilling rig as claimed in claim 1, It is characterized in that The following steps are involved: Step 1: Measure, lay out and determine the pile position: Before placing the curtain pile, expose the pile heads of the slope protection piles. According to the requirements of the pile position design drawings, measure and set the pile axis and positioning points. Steel bars with a diameter of not less than Ф25 can be used to drive holes with a depth of not less than 300mm at the pile position, fill them with white lime and insert steel bars to mark the pile position; Step 2: Drilling rig in place: Install a spiral jet grouting drill of appropriate length according to the pile length, connect it firmly, and after the drilling rig is positioned, the four legs are supported and cushioned steadily to keep the connecting arm (2) vertical. The verticality of the spiral jet grouting drill is controlled by the double-line hammer equipped by the drilling rig and the level ruler on the drilling rig. The verticality deviation is not greater than 0.5%. Theodolite is used to assist in monitoring. After the drilling rig is positioned, a re-inspection is carried out. The deviation between the drill tip and the pile point shall not exceed 20 mm. Before starting the drilling rig, the soil blocks in the drill rod and the drill tip should be cleaned; Step 3: Drilling: Start the spiral jet drilling tool to drill the hole. When it just touches the ground, the drilling speed should be slow. The drilling speed should be strictly controlled during construction. The drilling speed is controlled according to the parameters determined by the pile-forming process test based on the formation conditions. Stop drilling after reaching the design elevation end point; Step 4: Preparation of cement slurry: Measure the weight of water and cement according to the designed water-cement ratio, which should be 1.0-1.

5. Stir evenly in a slurry mixing bucket, filter through a 60-mesh sieve, and put into a slurry storage tank. Place a slurry pump in the slurry storage tank to stir the cement slurry continuously to prevent the cement slurry from settling. Cover the grouting pump head with a fine-mesh gauze cover to prevent the inhalation of coarse particles and block the drill nozzle; Step 5: Cement slurry jetting. The spiral jetting drill bit drills downwards and the grouting pump is started at the same time. High-pressure cement slurry is pumped into the spiral jetting drill bit and then into the hole. The pump pressure should be 20-30MPa. Stirring is performed while jetting. After feeding to the end point of the designed elevation, the drill bit is lifted at the designed lifting speed. At the same time, the jetting and stirring are stopped. When the cement slurry reaches the starting point of the designed elevation, the pumping and stirring of the cement slurry are stopped. In special cases such as sand and gravel layers, repeated jetting and stirring or fixed spraying are performed. Multiple stirring and spraying or fixed spraying are used to increase the pile diameter or the fixed spraying control width, thereby improving the water-stopping performance. Step 6: Clean the spiral jet grouting drill and proceed to the next pile construction. After the spiral jet grouting drill is taken out, clean the loose soil on the spiral jet grouting drill, check and ensure that the nozzle on the drill bit is unobstructed, and then move to the next pile position to construct the next pile.

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