A construction method for quickly connecting and placing long casing

Abstract

The present invention discloses a method for quickly extending and placing long casings. The method includes the following steps: 1. installing an adapter on the drill pipe of a rotary drill; 2. hoisting a first steel casing in a steel casing to a predetermined construction location and connecting the upper end of the first steel casing to the adapter; 3. starting the rotary drill to rotate the first steel casing and insert it into the soil layer until the first steel casing drops to a first predetermined depth; 4. separating the first steel casing from the adapter and raising the adapter; 5. hoisting a second steel casing in the steel casing to a predetermined construction location, connecting the upper end of the second steel casing to the adapter of the rotary drill, and connecting the lower end of the second steel casing to the upper end of the first steel casing; and 6. starting the rotary drill to rotate the second steel casing and insert it into the soil layer until the second steel casing drops to a second predetermined depth. The present invention has the effect of reducing deformation of the steel casing during placement.

Description

Technical Field

[0001] The invention relates to the field of engineering construction, in particular to a construction method for quickly connecting and placing a long casing. Background Art

[0002] The commonly used method for placing long casing in place is to use a heavy hammer to directly drive the steel casing into the soil. However, this method is prone to deformation of the steel casing. Because the impact force of the hammer is difficult to control, the steel casing may undergo plastic deformation, bending, or local damage during the driving process, affecting its structure and performance, and even affecting subsequent construction and use.

[0003] In order to improve this problem, a new method is needed to reduce the deformation risk of steel casing. Summary of the Invention

[0004] In order to improve the steel casing placement method and reduce the deformation of the steel casing, the present application provides a long casing rapid lengthening and placement construction method.

[0005] The invention provides a method for quickly extending and placing a long casing using the following technical solutions:

[0006] A long casing rapid lengthening and placement construction method, the construction method comprising:

[0007] Step 1: Replace and install the adapter on the drill pipe of the rotary drill;

[0008] Step 2: hoisting the first steel casing to a predetermined construction location and connecting the upper end of the first steel casing to the adapter;

[0009] Step 3: Turn on the rotary drill to drive the first steel casing to rotate and insert it into the soil layer until the first steel casing falls to a first predetermined depth;

[0010] Step 4: Separate the first steel casing from the adapter and raise the adapter;

[0011] Step 5: Lift the second steel casing in the steel casing to the predetermined construction location, connect the upper end of the second steel casing to the adapter of the rotary drilling rig, and connect the lower end of the second steel casing to the upper end of the first steel casing;

[0012] Step 6: Turn on the rotary drill to drive the second steel casing to rotate and insert it into the soil layer until the second steel casing falls to a second predetermined depth.

[0013] By adopting the above technical solution, after the rotary drill is equipped with an adapter, it can be connected to the steel casing, so that the steel casing can be rotated and pressed down at the same time by the rotary drill. After using this positioning method, first, the existing rotary drill is modified, and the steel casing is buried in the soil layer by the method of rotary static pressure. Compared with using a vibrating hammer to hit the steel casing all the time, the impact on the steel casing can be effectively reduced, thereby reducing the deformation of the steel casing, so that the steel casing can more effectively support the excavated pile foundation hole wall, reducing the overflow of concrete from the deformed area after grouting and the collapse caused by unstable soil layer; second, when the steel casing needs to be pulled out of the soil layer for reuse after grouting is completed, the connection between the rotary drill and the steel casing can be used to more conveniently pull out the steel casing; third, because the rotary drill is always connected to the steel casing, when it is found that the steel casing is not aligned correctly, the steel casing can be pulled out from the soil layer in time for adjustment.

[0014] Preferably, the specific method of installing the adapter includes: providing a mounting hole on the adapter, setting a clamping block on the inner wall of the mounting hole, providing a slot for inserting the clamping block on the outer wall of the drill rod of the rotary drill, inserting the drill rod into the adapter through the mounting hole, and then using a fixing assembly to fix the adapter to the drill rod.

[0015] By adopting the above technical solution, after the adapter is installed on the drill rod of the rotary drill, the clamping block is stuck in the clamping groove. When the drill rod is drilling, the adapter can be driven to rotate, thereby driving the various steel casings installed on the adapter to rotate. The clamping block and the clamping groove can stably drive the adapter to rotate with the rotary rod, reducing the situation of adapter rotation failure.

[0016] Preferably, the fixing assembly includes a plurality of guide rods and a clamping ring, the adapter is circumferentially provided with a guide ring at the position of the mounting hole, each of the guide rods is circumferentially spaced and slidably mounted on the side wall of the guide ring, each of the guide rods slides in the horizontal direction toward or away from the axial center of the drill rod, a fixing groove for inserting one end of the guide rod located in the guide ring is provided on the outer wall of the drill rod, an elastic member for driving the guide rod to move in the direction away from the drill rod is installed at one end of the guide rod located outside the guide ring, one end of the elastic member is mounted on the guide rod, and the other end is mounted on the outer wall of the guide ring, the clamping ring is movably sleeved on the guide ring, and the inner side wall of the clamping ring is used to abut against one end of each guide rod located outside the guide ring;

[0017] The method for fixing the adapter to the drill rod using a fixing assembly includes: when the adapter is put on the drill rod, the clamping ring is put on the guide ring until the guide rod is inserted into the fixing groove.

[0018] When the drill bit is removed, the adapter needs to be removed from the guide ring and the drill bit needs to be replaced. When the drill bit is removed, the adapter needs to be removed from the guide ring and the guide rod needs to be removed from the guide ring. When the drill bit is removed, the adapter needs to be removed from the guide ring and the guide rod needs to be removed from the guide ring. When the drill bit is removed, the adapter needs to be removed from the guide ring and the guide rod needs to be removed from the guide ring. When the drill bit is removed, the adapter needs to be removed from the guide ring and the guide rod needs to be removed from the guide ring.

[0019] Preferably, the method of connecting the upper end of the first steel casing to the adapter comprises: sleeve-mounting the adapter on the steel casing, arranging a plurality of connecting rods along the circumferential direction on the outer side wall of the adapter, and using the connecting rods to penetrate the adapter and the first steel casing at the same time;

[0020] The method for connecting the lower end of the second steel casing with the upper end of the first steel casing includes: arranging a plurality of connecting rods along the circumferential direction on the outer side wall of the lower end of the second steel casing, and using the connecting rods to simultaneously penetrate the first steel casing and the second steel casing.

[0021] By adopting the above technical solution, a connecting rod is used to simultaneously insert into the connection between the first steel casing and the adapter, thereby locking the first steel casing on the adapter, so that the rotary drill can synchronously drive the first steel casing to rotate and fall into position, and at the same time, the same connecting rod is used to simultaneously pass through the first steel casing and the second steel casing, so that the first steel casing and the second steel casing can be quickly connected into one, and then the second steel casing can continue to drive the first steel casing to rotate and fall into position, completing the extension and placement of the entire steel casing; this connection and locking method is simple to operate and facilitates rapid construction.

[0022] Preferably, the connecting rod includes a rotating portion and a threaded portion connected to each other, the threaded portion is provided with an external thread, the side wall of one end where the steel casing and the adapter are connected to each other is provided with a connecting hole, the inner wall of each connecting hole is provided with an internal thread, and the external thread and the internal thread are adapted to each other;

[0023] The specific method of using the connecting rod includes: aligning the connecting rod with the two connecting holes, and then twisting the rotating part until the connecting rod stops moving.

[0024] By adopting the above technical solution, since the steel casing is always in contact with the soil layer during the falling process, the threaded part is used to simultaneously thread the first steel casing and the adapter, which can effectively enhance the connection stability between the connecting rod and each structure, thereby reducing the connection instability caused by the connecting rod slipping out due to the soil layer contacting the connecting rod.

[0025] Preferably, a connecting tube is detachably sleeved on the outer side wall of the connection between the first steel casing and the second steel casing, and two groups of clamping blocks are provided on the inner side wall of the connecting tube. The two groups of clamping blocks are arranged along the length direction of the first steel casing, and the clamping blocks of the same group are arranged on the inner side wall of the connecting tube at intervals in the circumferential direction; the outer side walls of the first steel casing and the second steel casing are both provided with clamping grooves, and the two groups of clamping blocks correspond to the first steel casing and the second steel casing respectively, and the two groups of clamping blocks are respectively clamped to the first steel casing and the second steel casing through the clamping grooves;

[0026] The specific method of connecting the lower end of the second steel casing with the upper end of the first steel casing includes: after the lower end of the second steel casing is sleeved on the upper end of the first steel casing, the clamping block in the connecting tube is aligned with the clamping groove; and then the connecting tube is installed at the connection between the first steel casing and the second steel casing.

[0027] Because the connecting rod is simultaneously passed through the two steel casings, the rotary drilling rig drives the steel casings to rotate continuously during the landing process, which causes relative rotation between the two steel casings, causing the connecting rod to be damaged by the relative rotation force, and the connecting rod is stuck in the two. By adopting the above technical solution, a clamping block is used to clamp the two steel casings. When the adapter drives the first steel casing to rotate through the second steel casing above, the clamping block and the connecting tube work together to further cooperate with the second steel casing to drive the first steel casing to rotate, reducing the pressure on the connecting rod caused by the relative rotation of the two steel casings, thereby reducing damage to the connecting rod, and at the same time making it convenient for construction personnel to twist the connecting rod after lifting the steel casing out of the soil layer to separate the steel casings.

[0028] Preferably, the specific method of step six includes: providing an inclined guide pattern on the outer side wall of the connecting tube, and when the steel casing is threadedly rotated, the guide pattern drives the steel casing to move in a vertical downward direction.

[0029] Because the inner and outer sides of the steel casing are directly in contact with the soil, the steel casing may be difficult to fall when the rotary drilling rig is used to rotate and press down. By adopting the above technical solution, the steel casing rotates with the adapter in the soil layer, and guide grooves are provided on the outside of the connecting tube. The guide grooves are used to push the steel casing down after rotation, thereby accelerating the landing speed of the steel casing and thus speeding up the construction progress.

[0030] Preferably, an annular airbag is provided between the first steel casing and the second steel casing, and an inflatable member for inflating the airbag is provided on the connecting tube;

[0031] The specific method of connecting the lower end of the second steel casing with the upper end of the first steel casing includes: firstly sleeve the annular airbag on the upper end of the first steel casing, and use the inflator to inflate the annular airbag when lowering the second steel casing.

[0032] By adopting the above technical solution, compared with the general use of welding to connect the various steel casings, this application uses connecting rods to connect the various steel casings. During the subsequent grouting construction, the slurry may overflow from the connection between the two steel casings, causing waste. An annular air bag is installed at the connection between the two steel casings to seal the gap at the connection and reduce the leakage of slurry.

[0033] Preferably, the inflatable member includes an air pump, an air pipe and a drive assembly, the air pump is fixedly mounted on the inner side wall of the connecting cylinder, one end of the air pipe is connected to the output end of the air pump, and the other end is connected to the inflation port of the annular airbag, the drive assembly is mounted in the connecting cylinder, and the drive assembly is used to drive the piston rod to slide back and forth;

[0034] The specific method of using the inflatable member to inflate the annular airbag includes: using the driving assembly to drive the piston rod to slide, thereby causing the air pump to inflate the annular airbag.

[0035] Because the connection between the steel casings is located in a deeper soil layer and both sides are pressed by the soil layer, it is difficult to place an air pipe in the steel casing to inflate the air bag on the ground. By adopting the above technical solution, an air pump is set in the connecting tube and the piston rod of the air pump is driven to slide through the driving member during the placement of the steel casing. This inflation method can inflate the air bag deep in the soil layer far away from the ground and lacking operating space, reducing the difficulty of inflation.

[0036] Preferably, the driving assembly includes a driving roller, a flywheel and a driving rod, wherein the driving roller is rotatably mounted in the connecting cylinder, and the angle between the rotation direction of the driving roller and the horizontal direction is consistent with the inclination angle of the guide groove; an opening is provided on the side wall of the connecting cylinder for allowing the roller surface of the driving roller to extend out of the connecting cylinder; the flywheel is rotatably mounted in the connecting cylinder, the driving roller and the flywheel are mounted on the same rotating shaft, one end of the driving rod is rotatably mounted on the wheel surface of the flywheel, and the other end is hinged to the piston rod; a pressure relief valve is installed on the airbag;

[0037] The specific method of using the drive assembly to drive the piston rod to slide includes: when the second steel casing falls, the drive rod abuts against the soil layer outside the connecting tube, driving the flywheel to rotate until the piston rod starts to slide.

[0038] By adopting the above technical solution, because the outer wall of the connecting tube is pressed against the soil layer, the roller surface of the driving roller is always pressed against the soil layer through the opening during the rotation and placement of the steel casing, thereby rolling on the soil layer that is in relative motion with the connecting tube, and the flywheel is driven to rotate in the connecting tube through the same rotating shaft, thereby driving the driving rod to rotate on the flywheel, and the other end of the driving rod continuously pushes the air pump piston rod of the fixed track back and forth, thereby inflating the airbag, and at the same time, because the steel casing rotates downward and falls into position under the action of the guide groove, the inclined setting of the driving roller can better roll with the rotation of the steel casing; through this driving method, the relative displacement between the steel casing and the soil layer is utilized to realize the inflation of the airbag, so that the airbag can be inflated deep in the soil layer that is difficult to construct.

[0039] In summary, this application includes at least one of the following beneficial technical effects:

[0040] 1. First, compared to using a vibratory hammer to continuously strike the steel casing, this can effectively reduce the impact on the steel casing, thereby reducing its deformation, allowing the steel casing to more effectively support the excavated pile foundation hole wall, reducing concrete overflow from the deformed area after grouting and hole collapse caused by unstable soil. Second, when the steel casing needs to be extracted from the soil after grouting, the connection between the rotary drill and the steel casing makes it easier to extract the steel casing. Third, because the rotary drill is continuously connected to the steel casing, if the steel casing is found to be misaligned, it can be promptly extracted from the soil for adjustment.

[0041] 2. Because both the inner and outer sides of the steel casing are directly in contact with the soil, when the rotary drilling rig is used to rotate and press down, the steel casing may be difficult to fall, requiring greater power, thereby increasing the possibility of damage to the rotary drilling rig. By adopting the above technical solution, because the steel casing rotates with the adapter in the soil layer, guide grooves are provided on the outside of the connecting tube. The guide grooves push the steel casing down after rotation, reducing the power required by the rotary drilling rig and lowering construction costs.

[0042] 3. Because the outer wall of the connecting tube is pressed against the soil layer, the roller surface of the driving roller is always pressed against the soil layer through the opening during the rotation and placement of the steel casing, thereby rolling on the soil layer that is in relative motion with the connecting tube, and driving the flywheel to rotate in the connecting tube through the same rotating shaft, thereby driving the driving rod to rotate on the flywheel, and the other end of the driving rod continuously pushes the air pump piston rod on the fixed track back and forth, thereby inflating the air bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is an overall structural diagram of a steel casing in place in a construction method for quickly extending and placing a long casing in an embodiment of the present application.

[0044] Figure 2 It is a schematic diagram of the connection structure between steel casing and adapter in a construction method for quickly extending and placing long casing in an embodiment of the present application.

[0045] Figure 3 It is a schematic diagram of the adapter structure of a long casing rapid lengthening and placement construction method according to an embodiment of the present application.

[0046] Figure 4 yes Figure 2 Magnified view of B.

[0047] Figure 5 yes Figure 2 Enlarged view of C in the middle.

[0048] Figure 6 yes Figure 1 A magnified view of center.

[0049] Figure 7 It is a cross-sectional view of a steel casing in a construction method for quickly extending and placing a long casing in an embodiment of the present application.

[0050] Figure 8 yes Figure 7 Enlarged view of D in the middle.

[0051] Description of reference numerals:

[0052] 1. Drill pipe; 11. Clamping groove; 2. First steel casing; 3. Second steel casing; 4. Adapter; 41. Mounting hole; 42. Clamping block; 43. Guide ring; 44. Elastic member; 5. Fixing assembly; 51. Guide rod; 511. Guide surface; 52. Clamping ring; 6. Connecting rod; 61. Rotating portion; 62. Threaded portion; 7. Connecting tube; 71. Clamping block; 72. Clamping groove; 73. Guide pattern; 8. Annular airbag; 9. Inflatable member; 91. Air pump; 92. Air pipe; 93. Drive assembly; 931. Drive roller; 932. Flywheel; 933. Drive rod. DETAILED DESCRIPTION

[0053] The present application discloses a method for quickly extending and placing a long casing. Figure 1 and Figure 2 The long casing rapid extension and placement construction method includes:

[0054] S10: The construction workers remove the original drill bit of the rotary drill and install the adapter 4 on the drill rod 1 of the rotary drill.

[0055] S20: Use a crane to lift the first steel casing 2 and place it vertically at a predetermined construction location, and connect the upper end of the first steel casing 2 to the adapter 4.

[0056] S30: The construction personnel start the rotating assembly of the rotary drill to control the rotation of the drill rod 1, and drive the first steel casing 2 to rotate through the adapter 4 and insert it into the soil layer, and continue to press down until the bottom of the first steel casing 2 is at the first predetermined depth.

[0057] S40: The construction workers disassemble and separate the first steel casing 2 from the adapter 4, and raise the adapter 4 on the drill pipe 1.

[0058] S50: The construction workers lift the second steel casing 3 in the steel casing and place it vertically at a predetermined construction position, connect the upper end of the second steel casing 3 to the adapter 4 of the rotary drilling rig, and connect the lower end of the second steel casing 3 to the upper end of the first steel casing 2.

[0059] S60: The construction personnel start the rotating assembly of the rotary drill to drive the drill rod 1 to drive the adapter 4 to rotate and press down, thereby driving the second steel casing 3 to rotate and insert into the soil layer until the second steel casing 3 falls to the second predetermined depth.

[0060] Reference Figure 2 and Figure 3 The adapter 4 is provided with a mounting hole 41 at the center of the cross section, and a plurality of blocks 42 are arranged at intervals along the circumferential direction on the inner wall of the mounting hole 41. A slot 11 for the block 42 to slide into is provided on the outer wall of the drill rod 1 of the rotary drill. The block 42 is clamped to the drill rod 1 through the slot 11, and the drill rod 1 is plugged into the adapter 4 through the mounting hole 41. A fixing assembly 5 for fixing the adapter 4 on the drill rod 1 is installed on the adapter 4. The fixing assembly 5 includes a plurality of guide rods 51 and a clamping ring 52. A guide ring 43 is circumferentially provided on the side of the adapter 4 away from the first steel casing 2 at the position of the mounting hole 41. Each guide rod 51 is circumferentially spaced and slidably mounted on the side wall of the guide ring 43. Each guide rod 51 is horizontally oriented toward or away from the axis of the drill rod 1. The guide rod 51 is provided with a fixing groove on the outer wall of the drill rod 1 for inserting one end thereof into the guide ring 43. The guide rod 51 is provided with an elastic member 44 on the end thereof outside the guide ring 43 for driving the guide rod 51 to move away from the drill rod 1. In this embodiment, the elastic member 44 is a spring, one end of which is mounted on the guide rod 51 and the other end is mounted on the outer wall of the guide ring 43. The snap ring 52 is movably sleeved on the guide ring 43. The end of each guide rod 51 outside the guide ring 43 is provided with a guide surface 511. The inner side wall of the snap ring 52 is used to abut against the guide surface 511 of the guide rod 51. When the snap ring 52 is sleeved on the guide ring 43, the guide rod 51 slides towards the direction close to the drill rod 1 under the action of the guide surface 511.

[0061] The specific method of installing the adapter 4 on the drill rod 1 of the rotary drill in S10 includes:

[0062] S11: First pull the clamping ring 52 out of the guide ring 43, and after aligning the block 42 on the adapter 4 with the slot 11 on the drill rod 1, put the adapter 4 on the drill rod 1 until the guide rod 51 is aligned with the fixing slot on the drill rod 1. At this time, re-sleeve the clamping ring 52 on the guide ring 43. Under the action of the guide surface 511, each guide rod 51 slides on the guide ring 43 toward the drill rod 1, thereby inserting into the fixing slot. At this time, the lower end of the clamping ring 52 abuts against the body of the adapter 4, so that the clamping ring 52 is stably sleeved on the guide ring 43 under the action of its own gravity, thereby stabilizing the adapter 4 on the drill rod 1; through the fixing assembly 5 and the block 42, the drill rod 1 can stably drive the adapter 4 to rotate and move in the vertical direction.

[0063] The specific method of connecting the upper end of the first steel casing 2 to the adapter 4 in S20 includes: a first avoidance groove for the adapter 4 to be sleeved is formed in the upper end of the first steel casing 2, the first avoidance groove being annular, the adapter 4 is sleeved on the first steel casing 2 through the first avoidance groove, and the construction personnel then use the connecting rod 6 to pass through the adapter 4 and the first steel casing 2 at the same time;

[0064] Reference Figure 4 and Figure 5 The specific method of connecting the lower end of the second steel casing 3 with the upper end of the first steel casing 2 in S50 includes: a second avoidance groove for the adapter 4 to be sleeved is concave in the upper end of the second steel casing 3, and the second avoidance groove is annular. The second steel casing 3 is sleeved on the first steel casing 2 through the first avoidance groove toward the lower end, and then the adapter 4 is sleeved on the second steel casing 3 through the second avoidance groove. Finally, a connecting rod 6 is first used to simultaneously penetrate the first steel casing 2 and the second steel casing 3, and then another connecting rod 6 is used to simultaneously penetrate the adapter 4 and the second steel casing 3.

[0065] Reference Figure 4 The connecting rod 6 includes a rotating portion 61 and a threaded portion 62 that are connected to each other. The threaded portion 62 is provided with an external thread. The side wall of one end where the first steel casing 2 and the second steel casing 3 are connected to each other and the side wall of one end where the steel casing and the adapter 4 are connected to each other are both provided with connecting holes. The connecting holes are respectively arranged on the side walls of the first steel casing 2, the second steel casing 3 and the adapter 4 at intervals along the circumferential direction; the inner wall of each connecting hole is provided with an internal thread, and the external thread and the internal thread are adapted to each other.

[0066] The specific method of using the connecting rod 6 to pass through the adapter 4 and the steel casing and using the connecting rod 6 to pass through the first steel casing 2 and the second steel casing 3 includes: after aligning the connecting rod 6 with the connecting hole, screwing the rotating part 61 until the connecting rod 6 no longer moves, and through the threaded connection of the threaded rod, the connection between the first steel casing 2 and the second steel casing 3 and between each steel casing and the adapter 4 is more stable, ensuring safety during construction.

[0067] Reference Figure 2 and Figure 5 , a connecting tube 7 is detachably sleeved on the outer side wall of the connection between the first steel casing 2 and the second steel casing 3, and the connecting tube 7 includes two tube monomers. The cross section of the tube monomer is semicircular, and a threaded hole is opened on the outer side wall of the connection between the two tube monomers. The tube monomers are threadedly connected with bolts at the position of the threaded hole. When the two tube monomers are installed at the connection between the first steel casing 2 and the second steel casing 3, the bolts are used to be threadedly connected to the two tube monomers at the same time through the threaded holes to fix them;

[0068] Reference Figure 5 Two groups of clamping blocks 71 are provided on the inner side wall of the connecting tube 7. The two groups of clamping blocks 71 are arranged along the length direction of the first steel casing 2. The clamping blocks 71 of the same group are arranged on the inner side wall of the connecting tube 7 at intervals along the circumferential direction; the outer side walls of the first steel casing 2 and the second steel casing 3 are both provided with clamping grooves 72. The two groups of clamping blocks 71 correspond to the first steel casing 2 and the second steel casing 3 respectively, and the respective clamping blocks 71 in the two groups are clamped to the first steel casing 2 and the second steel casing 3 respectively through the clamping grooves 72;

[0069] The method for connecting the lower end of the second steel casing 3 with the upper end of the first steel casing 2 in S50 also includes: after the lower end of the second steel casing 3 is sleeved on the upper end of the first steel casing 2 through the first avoidance groove, the clamping block 71 in each tube monomer is aligned with the clamping groove 72; after each tube monomer is installed at the connection between the first steel casing 2 and the second steel casing 3, the two tube monomers are fixedly connected with bolts so that the connecting tube 7 is sleeved between the first steel casing 2 and the second steel casing 3; the connecting tube 7 is sleeved between the two steel casings, and in the process of the second steel casing 3 rotating and thereby driving the first steel casing 2 to rotate, the connection between the two steel casings is further strengthened, thereby reducing the force applied to the connecting rod 6 and reducing the degree of deformation of the connecting rod 6 under stress.

[0070] Reference Figure 6 An inclined guide pattern 73 is provided on the outer wall of the connecting tube 7. When the steel casing thread rotates, the guide pattern 73 drives the steel casing to move in a vertical downward direction, reducing the difficulty of the steel casing as a whole entering the soil layer.

[0071] Reference Figure 5 and Figure 6An annular airbag 8 is provided between the first steel casing 2 and the second steel casing 3, and an inflatable member 9 for inflating the airbag is provided on the connecting tube 7; the inflatable member 9 includes an air pump 91, an air pipe 92 and a drive assembly 93. The air pump 91 is fixedly mounted on the inner side wall of the connecting tube 7, one end of the air pipe 92 is connected to the output end of the air pump 91, and the other end is connected to the inflation port of the annular airbag 8. The drive assembly 93 is installed in the connecting tube 7, and the drive assembly 93 is used to drive the piston rod to slide back and forth;

[0072] Reference Figure 7 and Figure 8 The driving assembly 93 includes a driving roller 931, a flywheel 932 and a driving rod 933. The driving roller 931 is rotatably mounted in the connecting cylinder 7, and the angle between the rotation direction of the driving roller 931 and the horizontal direction is consistent with the inclination angle of the guide pattern 73. An opening is provided on the side wall of the connecting cylinder 7 for the roller surface of the driving roller 931 to extend out of the connecting cylinder 7. The flywheel 932 is rotatably mounted in the connecting cylinder 7. The driving roller 931 and the flywheel 932 are mounted on the same rotating shaft. One end of the driving rod 933 is rotatably mounted on the wheel surface of the flywheel 932, and the other end is hinged to the piston rod. A pressure relief valve is installed on the airbag.

[0073] The method of connecting the lower end of the second steel casing 3 to the upper end of the first steel casing 2 in S50 also includes: firstly sleeve the annular airbag 8 on the upper end of the first steel casing 2, then sleeve the second steel casing 3 on the first steel casing 2, and use the inflator 9 to inflate the annular airbag 8 when lowering the second steel casing 3.

[0074] The specific method of using the inflatable member 9 to inflate the annular airbag 8 includes: when the steel casing falls, the driving roller 931 abuts against the soil layer outside the connecting tube 7 and rotates, thereby driving the flywheel 932 to rotate and driving the driving rod 933 to rotate on the flywheel 932, so that the driving rod 933 moves away from one end of the flywheel 932, thereby driving the fixed air pump 91 piston rod to slide and inflate the airbag.

[0075] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for quickly connecting and placing a long casing, characterized in that: The construction method comprises: Step 1: Installing an adapter (4) on the drill rod (1) of the rotary drill; Step 2: hoisting the first steel casing (2) in the steel casing to a predetermined construction location and connecting the upper end of the first steel casing (2) to the adapter (4); Step 3: Turn on the rotary drill to drive the first steel casing (2) to rotate and insert it into the soil layer until the first steel casing (2) falls to a first predetermined depth; Step 4: Separate the first steel casing (2) from the adapter (4) and raise the adapter (4); Step 5: hoist the second steel casing (3) in the steel casing to the predetermined construction location, connect the upper end of the second steel casing (3) to the adapter (4) of the rotary drilling machine, and connect the lower end of the second steel casing (3) to the upper end of the first steel casing (2); Step 6: Turn on the rotary drill to drive the second steel casing (3) to rotate and insert it into the soil layer until the second steel casing (3) falls to a second predetermined depth; A connecting tube (7) is detachably sleeved on the outer side wall of the connection between the first steel casing (2) and the second steel casing (3); The specific method of step six includes: providing an inclined guide pattern (73) on the outer side wall of the connecting tube (7), and when the steel casing is threadedly rotated, the guide pattern (73) drives the steel casing to move in a vertical downward direction; An annular airbag (8) is provided between the first steel casing (2) and the second steel casing (3), and an inflating member (9) for inflating the airbag is provided on the connecting tube (7); The specific method for connecting the lower end of the second steel casing (3) with the upper end of the first steel casing (2) comprises: firstly sleeve the annular airbag (8) on the upper end of the first steel casing (2), and then inflate the annular airbag (8) using the inflatable member (9) when lowering the second steel casing (3); The inflatable member (9) comprises an air pump (91), an air pipe (92) and a driving assembly (93); the air pump (91) is fixedly mounted on the inner side wall of the connecting tube (7); one end of the air pipe (92) is connected to the output end of the air pump (91) and the other end is connected to the inflation port of the annular airbag (8); the driving assembly (93) is mounted in the connecting tube (7); and the driving assembly (93) is used to drive the piston rod to slide back and forth; The specific method of using the inflatable member (9) to inflate the annular airbag (8) includes: using the driving assembly (93) to drive the piston rod to slide, thereby causing the air pump (91) to inflate the annular airbag (8); The driving assembly (93) includes a driving roller (931), a flywheel (932) and a driving rod (933). The driving roller (931) is rotatably mounted in the connecting cylinder (7), and the angle between the rotation direction of the driving roller (931) and the horizontal direction is consistent with the inclination angle of the guide pattern (73). An opening is provided on the side wall of the connecting cylinder (7) for the roller surface of the driving roller (931) to extend out of the connecting cylinder (7). The flywheel (932) is rotatably mounted in the connecting cylinder (7). The driving roller (931) and the flywheel (932) are mounted on the same rotating shaft. One end of the driving rod (933) is rotatably mounted on the wheel surface of the flywheel (932), and the other end is hinged to the piston rod. A pressure relief valve is installed on the airbag. The specific method of using the driving assembly (93) to drive the piston rod to slide includes: when the second steel casing (3) falls, the driving roller (931) abuts against the soil layer outside the connecting tube (7), driving the flywheel (932) to rotate until the piston rod starts to slide.

2. A long casing rapid extension and placement construction method according to claim 1, characterized in that: The specific method for installing the adapter (4) comprises: providing a mounting hole (41) on the adapter (4), arranging blocks (42) at intervals along the circumferential direction on the inner wall of the mounting hole (41), providing a slot (11) for the blocks (42) to slide into on the outer wall of the drill rod (1) of the rotary drill, inserting the drill rod (1) into the adapter (4) through the mounting hole (41), and then fixing the adapter (4) to the drill rod (1) using a fixing assembly (5).

3. A long casing rapid extension and placement construction method according to claim 2, characterized in that: The fixing assembly (5) includes a plurality of guide rods (51) and a retaining ring (52). The adapter (4) is provided with a guide ring (43) along the circumferential direction at the position of the mounting hole (41). Each of the guide rods (51) is circumferentially spaced and slidably mounted on the side wall of the guide ring (43). Each of the guide rods (51) slides in the horizontal direction toward or away from the axial center of the drill rod (1). A retaining ring is provided on the outer side wall of the drill rod (1) for inserting one end of the guide rod (51) into the guide ring (43). A fixing groove is provided, wherein one end of the guide rod (51) passing through the guide ring (43) is provided with an elastic member (44) for driving the guide rod (51) to move away from the drill rod (1), one end of the elastic member (44) is provided on the guide rod (51), and the other end is provided on the outer wall of the guide ring (43), the clamping ring (52) is movably sleeved on the guide ring (43), and the inner wall of the clamping ring (52) is used to abut against one end of each guide rod (51) located outside the guide ring (43); The method for fixing the adapter (4) on the drill rod (1) using a fixing assembly (5) comprises: when the adapter (4) is put on the drill rod (1), the clamping ring (52) is put on the guide ring (43) until the guide rod (51) is inserted into the fixing groove.

4. A long casing rapid extension and placement construction method according to claim 1, characterized in that: The method for connecting the upper end of the first steel casing (2) to the adapter (4) comprises: sleeve-mounting the adapter (4) on the steel casing, and using a connecting rod (6) to simultaneously penetrate the adapter (4) and the first steel casing (2); The method for connecting the lower end of the second steel casing (3) with the upper end of the first steel casing (2) comprises: after the second steel casing (3) is sleeved on the first steel casing (2), one of the connecting rods (6) is first used to simultaneously penetrate the first steel casing (2) and the second steel casing (3), and then the other connecting rod (6) is used to simultaneously penetrate the adapter (4) and the second steel casing (3).

5. A long casing rapid extension and placement construction method according to claim 4, characterized in that: The connecting rod (6) includes a rotating portion (61) and a threaded portion (62) connected to each other, the threaded portion (62) is provided with an external thread, a side wall of one end where the first steel casing (2) and the second steel casing (3) are connected to each other, and a side wall of one end where the steel casing and the adapter (4) are connected to each other are provided with a connecting hole, and an inner hole wall of each connecting hole is provided with an internal thread, and the external thread and the internal thread are adapted to each other; The specific method of using the connecting rod (6) comprises: aligning the connecting rod (6) with the two connecting holes, and then twisting the rotating part (61) until the connecting rod (6) stops moving.

6. A long casing rapid extension and placement construction method according to claim 4, characterized in that: Two groups of clamping blocks (71) are provided on the inner side wall of the connecting tube (7), and the two groups of clamping blocks (71) are arranged along the length direction of the first steel casing (2), and the clamping blocks (71) of the same group are arranged on the inner side wall of the connecting tube (7) at intervals along the circumferential direction; the outer side walls of the first steel casing (2) and the second steel casing (3) are both provided with clamping grooves (72), and the two groups of clamping blocks (71) correspond to the first steel casing (2) and the second steel casing (3), respectively, and the two groups of clamping blocks (71) are clamped to the first steel casing (2) and the second steel casing (3) respectively through the clamping grooves (72); The specific method for connecting the lower end of the second steel casing (3) with the upper end of the first steel casing (2) comprises: after the lower end of the second steel casing (3) is sleeved on the upper end of the first steel casing (2), the clamping block (71) in the connecting tube (7) is aligned with the clamping groove (72); and then the connecting tube (7) is installed at the connection between the first steel casing (2) and the second steel casing (3).

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