Device for installing non-fine concrete pipeline and construction method

Abstract

The invention discloses a device for installing a non-fine concrete pipeline and a construction method, and relates to the technical field of installation of dewatering well non-fine concrete pipelines. Comprising a supporting frame and a pipeline hoisting mechanism, the supporting frame comprises a first threaded stand column and a second threaded stand column, the first threaded stand column and the second threaded stand column are connected through a connecting sleeve, adjusting rod connecting rings are connected to the surfaces of the first threaded stand column and the second threaded stand column in a threaded mode, and hinge arms are hinged to the surfaces of the adjusting rod connecting rings; and a connecting shaft and a rocker arm are installed at the top of the first threaded stand column, and the rocker arm controls the connecting shaft to rotate. Through the arrangement of the supporting frame, the hoisting frame and the like, the device can be used for installing non-fine concrete pipelines with different diameters, a plurality of sets of non-fine concrete pipeline installation tools do not need to be independently manufactured, vertical bamboo strips do not need to be used for fixing a well pipe during pipe connection, the construction efficiency is improved, the risk of pipe separation in the pipeline hoisting process is effectively avoided, and the construction cost is reduced. The construction quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of installation of sandless concrete pipes for precipitation wells, and in particular to a device and a construction method for installing sandless concrete pipes. Background Art

[0002] At present, most municipal drainage projects involve deep foundation pit dewatering construction, and pipe well dewatering has become a widely used dewatering method due to its advantages such as simple equipment, large drainage volume, and deep dewatering. Pipe well dewatering often uses sandless concrete pipes as the main body of the well body. It has the characteristics of high-strength hollow pipes, high-density micropores, and overall water permeability. Compared with corrugated pipes, its single section length is short, and vertical bamboo strips are needed to fix the well pipe when connecting the pipes. Therefore, it is time-consuming and labor-intensive during construction, and the construction efficiency is low. There is a risk of pipe detachment during the process of pipe hanging, so it is necessary to design a device and construction method for installing sandless concrete pipes. Summary of the invention

[0003] The object of the present invention is to provide a device and a construction method for installing a sandless concrete pipe to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a device for installing a sandless concrete pipe, comprising: Support frame and pipe lifting mechanism; The support frame comprises a threaded column 1 and a threaded column 2, the threaded column 1 and the threaded column 2 are connected by a connecting sleeve, the surfaces of the threaded column 1 and the threaded column 2 are both threaded with an adjusting rod connecting ring, the surfaces of the adjusting rod connecting ring are both hinged with an articulated arm, and the end of the articulated arm is hingedly installed with a fixed support; A connecting shaft and a rocker arm are installed on the top of the threaded column, and the rocker arm controls the rotation of the connecting shaft; The pipeline hoisting mechanism vertically hoists the support frame to the wellhead, and controls the hoisting frame to be vertically lowered into the wellhead.

[0005] Furthermore, regarding this scheme, a ratchet drum is rotatably installed in the shell of the connecting shaft, and a pawl engaged with the ratchet drum is also provided on one side of the shell of the connecting shaft, a conversion block is provided on one side of the pawl, and a spring abutting against the conversion block is provided on one side of the conversion block, wherein a direction selection paddle is also installed on the top of the shell of the connecting shaft, and the direction selection paddle controls the rotation direction of the ratchet drum by controlling the conversion block.

[0006] Further to this solution, the middle portion of the connecting shaft is through, the inner wall of the ratchet cylinder is provided with a thread, and a threaded column is provided at one end of the rocker arm to be threadedly connected to the ratchet cylinder.

[0007] Further to this solution, the pipeline hoisting mechanism includes a hoisting frame and a sandless concrete pipe clamp; The bottom of the hanging frame is a rectangular frame, and two fixed card plates are slidably installed between the inner walls on both sides of the rectangular frame of the hanging frame. The two fixed card plates are symmetrically placed and a handle is fixed on the top of each fixed card plate. Card plate access openings are opened at both ends of the rectangular frame of the hanging frame for placing and removing the fixed card plates, and a number of limit bolts are screwed on the top of both sides of the rectangular frame of the hanging frame for fixing the fixed card plates.

[0008] Further to this solution, vertical poles are fixed in the middle of both sides of the rectangular frame of the lifting frame, a crossbeam passes between the tops of the two vertical poles, an electric winch is slidably installed on the crossbeam, and the sandless concrete pipe clamp is installed on the hook of the electric winch.

[0009] Further to this solution, the sandless concrete pipe clamp includes two clamps, and a lifting ring is provided on the top of the clamp, and the lifting ring is hung on a hook of the electric winch.

[0010] Further to this solution, two symmetrically arranged oblique rods are fixed on the top of the vertical rods, and pads fixed to the rectangular frame are arranged at the ends of the oblique rods, wherein fastening bolts are arranged around the rectangular frame and at the bottom of the pads.

[0011] The construction method of the device for installing a sandless concrete pipe adopts the above-mentioned device for installing a sandless concrete pipe. Step 1: Tube well measurement and positioning; Step 2: Drilling holes; Step 3: Change the pulp; Step 4: Lifting the well pipe; Step 5: Backfill the gravel filter layer; Step 6: Wash the well; Step 7: Recover the support frame; Step 8: Install pumping equipment.

[0012] Further to the scheme, the step 4: hanging and placing the well pipe; Place the pipe hanging frame on the wellhead, adjust the height of the legs so that the bubble in the spirit level is centered and tighten the fastening bolts, put the fixing clamp into the clamp access port, and push the fixing clamp to the appropriate position using the handle, place the first section of the sandless concrete pipe on the hanging frame, clamp the sandless concrete pipe with the fixing clamp, and tighten the limit bolts to position the fixing clamp, fix the two sandless concrete pipes with the support frame, and use an electric winch to install them section by section and sink them section by section to the designed elevation.

[0013] Further to the scheme, the step 4: hanging and placing the well pipe; The fixed supports of the support frames are uniformly pre-adjusted to a size slightly smaller than the inner diameter of the sandless concrete pipe, and then the various support frames are connected into a whole on the ground. A truck crane is used to lift the whole frame into the sandless concrete pipe that has been pre-assembled on the ground, and the whole frame is lifted into the well with a truck crane. When the designed depth is reached, the support frames are recovered one by one.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The device and construction method for installing sandless concrete pipes are provided with a support frame and a hanging frame, etc. The device can install sandless concrete pipes of different diameters, and there is no need to separately make multiple sets of installation tools for sandless concrete pipes. When connecting the pipes, there is no need to fix the well pipes with vertical bamboo strips, which improves the construction efficiency, effectively avoids the risk of the pipes falling off during the process of hanging and placing the pipes, and improves the construction quality.

[0015] At the same time, the device can be processed in batches, is convenient to disassemble and assemble, is easy to use, can save manpower and material resources, and reduce costs. The device can effectively ensure the verticality of the well body and prevent the well body from tilting and collapsing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the support frame installation structure of the present invention; Figure 2 It is a schematic diagram of the support frame structure of the present invention; Figure 3 It is a schematic diagram of the connecting shaft structure of the present invention; Figure 4 It is a schematic diagram of the fixed support structure of the present invention; Figure 5 It is a schematic diagram of the pipeline hanging structure of the present invention; Figure 6 It is a structural schematic diagram of the hanging frame of the present invention; Figure 7 The present invention is a flow chart of the pipe well dewatering construction process.

[0017] In the figure: 1. sandless concrete pipe; 2. connecting shaft; 201. direction selection paddle; 202. ratchet drum; 203. pawl; 204. conversion block; 205. spring; 3. threaded column one; 4. threaded column two; 5. connecting sleeve; 6. adjusting rod connecting ring; 601. articulated arm; 602. fixed support; 603. friction block; 7. rocker arm; 8. lifting frame; 801. level; 802. fixed card plate; 803. handle; 804. limit bolt; 805. adjusting leg; 806. fastening bolt; 807. card plate taking and releasing port; 808. vertical pole; 809. electric winch; 810. diagonal rod; 811. beam; 9. sandless concrete pipe clamp; 901. clamp; 902. lifting ring. DETAILED DESCRIPTION

[0018] 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.

[0019] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the present invention provides a new technical solution: a device for installing a sandless concrete pipe, comprising: The support frame and the pipeline lifting mechanism, the support frame includes a threaded column 1 3 and a threaded column 2 4, the threaded column 1 3 and the threaded column 2 4 are connected by a connecting sleeve 5, the surfaces of the threaded column 1 3 and the threaded column 2 4 are both screwed with an adjusting rod connecting ring 6, the surfaces of the adjusting rod connecting ring 6 are both hinged with an articulated arm 601, the end of the articulated arm 601 is hingedly installed with a fixed support 602, the top of the threaded column 1 3 is installed with a connecting shaft 2 and a rocker arm 7, the rocker arm 7 controls the rotation of the connecting shaft 2, and the fixed support 602 is fixed with a plurality of friction blocks 603 to increase the friction with the pipe joint and improve stability.

[0020] A ratchet drum 202 is rotatably installed in the shell of the connecting shaft 2, and a pawl 203 engaged with the ratchet drum 202 is also provided on one side of the shell of the connecting shaft 2, a conversion block 204 is provided on one side of the pawl 203, and a spring 205 abutting against the conversion block 204 is provided on one side of the conversion block 204, wherein a direction selection paddle 201 is also installed on the top of the shell of the connecting shaft 2, and the direction selection paddle 201 controls the rotation direction of the ratchet drum 202 by controlling the conversion block 204. When the direction selection paddle 201 is in a position allowing forward rotation, it compresses the spring 205 by controlling the conversion block 204, so that the pawl 203 is in a position matching the tooth groove of the ratchet drum 202. At this time, if an external force acts to make the ratchet drum 202 rotate forward, the pawl 203 will be smoothly embedded in the tooth groove of the ratchet drum 202 under the pressure of the spring 205, and move one tooth at a time with the rotation of the ratchet drum 202, thereby realizing the forward rotation of the ratchet drum 202. When the ratchet drum 202 attempts to rotate in the reverse direction, the pawl 203 will tightly press against the back of the teeth of the ratchet drum 202. Since the pawl 203 is subjected to the pressure of the spring 205 and the connection restriction between itself and the housing of the connecting shaft 2, it cannot move in the reverse direction, thereby preventing the ratchet drum 202 from rotating in the reverse direction.

[0021] In summary, the upper and lower threaded columns of the support frame are connected through the connecting sleeve 5, and then the fixed support 602, the articulated arm 601, and the adjusting rod connecting ring 6 are assembled, and the same number of support frames are configured according to the number of sandless concrete pipes 1, and the support frame is placed in the sandless concrete pipe 1, and the direction selection paddle 201 on the connecting shaft 2 is turned to adjust the direction of the ratchet drum 202 to rotate counterclockwise, and the connecting shaft 2 and the threaded column can rotate clockwise, and the rocker arm 7 is used to rotate the threaded column clockwise to control the adjusting arm articulated arm 601 and the adjusting rod connecting ring 6, so that the fixed support 602 extends outward and is connected to the sandless concrete pipe 1. The inner wall is tightly and firmly attached. Then, the direction selection paddle 201 on the connecting shaft 2 of the first supporting frame is toggled to adjust the direction of the ratchet drum 202 to rotate clockwise, and the connecting shaft 2 and the threaded column can rotate counterclockwise, and the lower threaded column 2 4 of the second supporting frame is screwed counterclockwise into the connecting shaft 2 of the upper threaded column 1 3 of the first supporting frame, and the rocker arm 7 is used to rotate the threaded column of the second supporting frame clockwise to control the adjusting rod connecting ring 6 and the articulated arm 601, so that the fixed support 602 extends outward and fits tightly and firmly with the inner wall of the second section of sandless concrete pipe 1, so as to realize the coaxial and stable connection of the two pipe sections and avoid the risk of falling off.

[0022] The pipeline lifting mechanism vertically lifts the support frame to the wellhead, and controls the lifting frame 8 to be vertically lowered into the wellhead. like Figure 3 As shown, the middle of the connecting shaft 2 is through, the inner wall of the ratchet cylinder 202 is provided with threads, and a threaded column is provided at one end of the rocker arm 7 to be threadedly connected with the ratchet cylinder 202.

[0023] like Figure 5 As shown, the pipeline hoisting mechanism includes a hoisting frame 8 and a sandless concrete pipe clamp 9; The bottom of the hanging frame 8 is a rectangular frame, and two fixed card plates 802 are slidably installed between the inner walls on both sides of the rectangular frame of the hanging frame 8. The two fixed card plates 802 are symmetrically placed and each fixed card plate 802 is fixed with a handle 803 on the top. Card plate access openings 807 are provided at both ends of the rectangular frame of the hanging frame 8 for placing and removing the fixed card plates 802. A number of limit bolts 804 are screwed on the tops of both sides of the rectangular frame of the hanging frame 8 for fixing the fixed card plates 802.

[0024] like Figure 5 As shown, vertical poles 808 are fixed in the middle of both sides of the rectangular frame of the hoisting frame 8, and a crossbeam 811 passes between the tops of the two vertical poles 808. An electric winch 809 is slidably installed on the crossbeam 811, and the sandless concrete pipe clamp 9 is installed on the hook of the electric winch 809.

[0025] like Figure 6As shown, the sandless concrete pipe clamp 9 includes two clamps 901, and a lifting ring 902 is arranged on the top of the clamp 901. The lifting ring 902 is hung on the hook of the electric winch 809. Two symmetrically arranged inclined rods 810 are fixed on the top of the vertical rod 808. The ends of the inclined rods 810 are both arranged on a pad fixed to the rectangular frame, wherein fastening bolts 806 are arranged around the rectangular frame and at the bottom of the pad.

[0026] like Figure 7 As shown, the construction method of the device for installing a sandless concrete pipe adopts the above-mentioned device for installing a sandless concrete pipe. Step 1: Tube well measurement and positioning; The center point of the well shall be laid out according to the construction drawing. The deviation of the well position shall not exceed 0.5m. A prominent mark shall be set up at the well position. A steel drill shall be driven into the well 300mm below the ground and marked.

[0027] Step 2: Drilling holes; 1. Determine the well site and install the casing. Fill the outside of the casing with clay to seal the surface miscellaneous fill soil.

[0028] 2. The drilling rig positioning deviation is less than 20mm, and the drilling tower verticality deviation is less than 1%.

[0029] 3. During drilling, keep the flushing liquid level no lower than 1m below the wellhead and drill to the required design depth.

[0030] Step 3: Change the pulp; After drilling to the required depth, raise the drill bit by about 0.5m, and then use an air compressor to wash the well until the mud density is close to 1:1. On-site observation is based on whether the mud does not stain hands after the mud change.

[0031] Step 4: Lifting the well pipe; Place the pipe hanging frame 8 on the wellhead, adjust the height of the adjusting legs 805 so that the bubble of the level 801 is centered and tighten the fastening bolts 806, put the fixed card plate 802 into the card plate access port 807, and push the fixed card plate 802 to the appropriate position through the handle 803.

[0032] Place the pipe hanging frame 8 on the wellhead, adjust the height of the adjusting legs 805 so that the bubble of the level 801 is centered and tighten the fastening bolts 806, put the fixed card plate 802 into the card plate access port 807, and push the fixed card plate 802 to the appropriate position through the handle 803.

[0033] Fix the support frame to the inner wall of a pipe section, place the first section of sandless concrete pipe 1 on the hanging frame 8, clamp the sandless concrete pipe 1 with the fixing clamp 802, and tighten the limit bolt 804 to position the fixing clamp 802. Then, fix the second section of the pipe section coaxially with the first section through the support frame again, use the sandless concrete pipe clamp 9, put the clamp 901 on the second section of sandless concrete pipe 1, start the electric winch 809 to lift the lifting ring 902, so that the clamp 901 clamps the second section of sandless concrete pipe 1, then loosen the limit bolt 804 and move the fixing clamp 802 to release the lock of the second section of sandless concrete pipe 1, start the electric winch 809 to lower the two sections of sandless concrete pipe 1, and after fixing the two sandless concrete pipes 1 through the support frame, use the electric winch 809 to install them section by section and sink them section by section to the designed elevation.

[0034] Step 5: Backfill the gravel filter layer; 1. Use 3-8 mm sand and gravel and shovel to cut the material to prevent uneven stratification and impact on the well pipe. The filling should be completed in one go.

[0035] 2. Seal the area from the top of the filter material to 2m from the ground with clay to prevent surface water and rainwater from flowing in.

[0036] Step 6: Wash the well; 1. Use air compressor to wash the well, and use acid washing when necessary.

[0037] 2. Put the air pipe and nozzle of the air compressor into the well, wash the upper well wall first, and then gradually lower the water pipe to the bottom of the well. The working pressure should not be less than 0.7MPa, and the exhaust volume should be greater than 6m 3 / min.

[0038] 3. When there is a lot of mud and sand in the well pipe, the method of "holding breath and boiling" is adopted, that is, repeatedly closing and opening the valve on the pipe to destroy the mud skin on the well wall. About 30 minutes after the start of well washing and every 60 minutes thereafter, close the valve on the pipe once, hold your breath for 2 to 3 minutes, and boil the water in the well to destroy the mud skin and the adhesion between the mud and sand and the filter material, until the water discharged from the well pipe becomes clear and reaches the normal water output.

[0039] Step 7: Recover the support frame; When the designed depth is reached, the rocker arm 7 is used to rotate the threaded columns 3 and 4 counterclockwise to retract the fixed support 602 inward, and then the support frames are recovered one by one.

[0040] Step 8: Install pumping equipment; 1. Before installing the submersible pump, run it on the ground for 3 to 5 minutes. If there are no problems, it can be put into the well for use.

[0041] 2. Install a submersible electric pump in the deep well, lower it into the water filter layer with a rope, and fix the upper part to the well pipe mouth.

[0042] 3. After the installation is completed, test pumping and start normal operation when the requirements are met.

[0043] Regarding this scheme further, step 4: hanging and placing the well pipe; Place the pipe hanging frame 8 on the wellhead, adjust the height of the adjusting leg 805 so that the bubble of the spirit level 801 is centered and tighten the fastening bolt 806, put the fixed clamp 802 into the clamp access port 807, and push the fixed clamp 802 to the appropriate position through the handle 803, place the first section of the sandless concrete pipe 1 on the hanging frame 8, clamp the sandless concrete pipe 1 with the fixed clamp 802, and tighten the limit bolt 804 to position the fixed clamp 802, fix the two sandless concrete pipes 1 through the support frame, and use the electric winch 809 to install them section by section and sink them section by section to the designed elevation.

[0044] Regarding this scheme further, step 4: hanging and placing the well pipe; The fixed supports 602 of the support frames are uniformly pre-adjusted to a size slightly smaller than the inner diameter of the sandless concrete pipe 1, and then the various support frames are connected into a whole on the ground, and are hoisted as a whole into the sandless concrete pipe 1 that has been pre-assembled on the ground using a truck crane, and are hoisted as a whole into the well using a truck crane. When the designed depth is reached, the support frames are recovered one by one.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. A device for installing sandless concrete pipes, characterized in that: include: Support frame and pipe lifting mechanism; The support frame comprises a threaded column 1 (3) and a threaded column 2 (4), the threaded column 1 (3) and the threaded column 2 (4) are connected via a connecting sleeve (5), the surfaces of the threaded column 1 (3) and the threaded column 2 (4) are both threadedly connected with an adjusting rod connecting ring (6), the surfaces of the adjusting rod connecting ring (6) are both hinged with an articulated arm (601), and the end of the articulated arm (601) is hingedly mounted with a fixed support (602); A connecting shaft (2) and a rocker arm (7) are mounted on the top of the threaded column 1 (3), and the rocker arm (7) controls the rotation of the connecting shaft (2); The pipeline hoisting mechanism vertically hoists the support frame to the wellhead, and controls the hoisting frame (8) to be vertically lowered into the wellhead.

2. The device for installing a sandless concrete pipe according to claim 1, characterized in that: A ratchet drum (202) is rotatably mounted in the housing of the connecting shaft (2); a ratchet pawl (203) engaged with the ratchet drum (202) is also provided on one side of the housing of the connecting shaft (2); a conversion block (204) is provided on one side of the ratchet pawl (203); a spring (205) abutting against the conversion block (204) is provided on one side of the conversion block (204); a direction selection paddle (201) is also installed on the top of the housing of the connecting shaft (2); the direction selection paddle (201) controls the rotation direction of the ratchet drum (202) by controlling the conversion block (204).

3. The device for installing a sandless concrete pipe according to claim 1, characterized in that: The middle of the connecting shaft (2) is through-connected, the inner wall of the ratchet rotating cylinder (202) is provided with a thread, and a threaded column is provided at one end of the rocker arm (7) and is threadedly connected to the ratchet rotating cylinder (202).

4. The device for installing a sandless concrete pipe according to claim 1, characterized in that: The pipeline hoisting mechanism comprises a hoisting frame (8) and a sandless concrete pipe clamp (9); The bottom of the hanging frame (8) is in the form of a rectangular frame. Two fixed card plates (802) are slidably mounted between the inner walls on both sides of the rectangular frame of the hanging frame (8). The two fixed card plates (802) are symmetrically placed and a handle (803) is fixed to the top of each fixed card plate (802). Card plate access openings (807) are provided at both ends of the rectangular frame of the hanging frame (8) for placing and removing the fixed card plates (802). A plurality of limit bolts (804) are screwed to the tops of both sides of the rectangular frame of the hanging frame (8) for fixing the fixed card plates (802).

5. The device for installing a sandless concrete pipe according to claim 4, characterized in that: Vertical poles (808) are fixed in the middle of both sides of the rectangular frame of the hoisting frame (8), a crossbeam (811) is passed between the tops of the two vertical poles (808), an electric hoist (809) is slidably mounted on the crossbeam (811), and the sandless concrete pipe clamp (9) is mounted on a hook of the electric hoist (809).

6. The device for installing a sandless concrete pipe according to claim 5, characterized in that: The sandless concrete pipe clamp (9) comprises two hoops (901), the tops of the hoops (901) are provided with lifting rings (902), and the lifting rings (902) are hung on the hooks of the electric winch (809).

7. The device for installing a sandless concrete pipe according to claim 6, characterized in that: Two symmetrically arranged oblique rods (810) are fixed to the top of the vertical rod (808), and the ends of the oblique rods (810) are both arranged on a pad fixed to the rectangular frame, wherein the rectangular frame and the bottom of the pad are both provided with adjustment legs (805), and the adjustment legs are provided with fastening bolts (806).

8. A construction method for installing a sandless concrete pipe, using the sandless concrete pipe installation device according to any one of claims 1 to 7, characterized in that: Step 1: Tube well measurement and positioning; Step 2: Drilling holes; Step 3: Change the pulp; Step 4: Lifting the well pipe; Step 5: Backfill the gravel filter layer; Step 6: Wash the well; Step 7: Recover the support frame; Step 8: Install pumping equipment.

9. The construction method of the device for installing sandless concrete pipe according to claim 8, characterized in that: The fourth step is to hang the well pipe; The pipe hanging frame (8) is placed on the wellhead, the height of the adjusting legs (805) is adjusted so that the bubble of the level (801) is centered and the fastening bolts (806) are tightened, the fixing clamp (802) is placed into the clamp access opening (807), and the fixing clamp (802) is pushed to a proper position by means of the handle (803), the first section of the sandless concrete pipe (1) is placed on the hanging frame (8), the sandless concrete pipe (1) is clamped by the fixing clamp (802), and the limiting bolts (804) are tightened to position the fixing clamp (802), the two sandless concrete pipes (1) are fixed by means of the support frame, and then the electric winch (809) is used to install the two sections one by one and sink them one by one to the designed elevation.

10. The construction method of the device for installing sandless concrete pipe according to claim 8, characterized in that: The fourth step is to hang the well pipe; The fixed supports (602) of the support frames are uniformly pre-adjusted to a size slightly smaller than the inner diameter of the sandless concrete pipe (1), and then the various support frames are connected to form a whole on the ground, and are hoisted as a whole into the sandless concrete pipe (1) pre-assembled on the ground using a truck crane, and are hoisted as a whole into the well using a truck crane. When the designed depth is reached, the support frames are recovered one by one.

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