A Recyclable Ultra-Deep Stiff Column Positioning and Adjusting Device and Method

Abstract

The present invention provides a recyclable positioning and adjustment device and method for ultra-deep stiff columns. The tool pipe has a top flange and a bottom flange. An upper hinge support for installing a hydraulic cylinder and a lower hinge support for installing a claw are provided on the outer circumferential surface of the working section. A connecting male head is arranged at the lower part of the working section and connected to a connecting female head of the lower transition section. A flange for connecting the stiff column is arranged at the lower part of the transition section. The connecting male head is provided with an inner pin hole; the outer diameter of the connecting male head is smaller than the inner diameter of the connecting female head; the upper oil cylinder on the working section is installed on the corresponding upper hinge support; the claw at the lower part of the push rod latches the plumb flange of the transition section. The claw has a hinged end, a hinged part and a clamping hook to combine the working section and the transition section; the centering oil cylinder push rod is installed on the mounting seat of the working section and is aligned with the pin holes on the connecting female head one by one; an inclination sensor is arranged on the tool pipe, and a plumb bob is connected to the inclination sensor. The present invention not only meets the construction requirements of ultra-deep stiff columns, but also has the advantage of being recyclable, effectively reducing the construction cost.

Description

Technical Field

[0001] The present invention relates to the technical field of urban underground space construction, and particularly to a recoverable positioning and adjusting device and method for ultra-deep stiff columns. Background Art

[0002] A stiff column is a structure composed of components with concrete wrapped outside a steel section, also called a concrete stiff column or a concrete steel column, and sometimes also called a concrete steel column. It has many advantages compared with a concrete structure.

[0003] During construction, the stiff column needs to be plumbed to ensure the engineering accuracy. The patent with the publication number "CN212802630U" discloses a device for correcting the verticality of a stiff column. Its principle is to use components or equipment such as jacks, anchor bolts, and total stations to achieve the adjustment of the verticality of the stiff column. It can be seen from its specification that during the adjustment process, components or equipment such as jacks and reflector plates need to be installed first, and then the total station is used to detect and feedback the data during the adjustment process, so as to gradually adjust the verticality of the stiff column to the preset range. However, this patent is not for the correction and adjustment of ultra-deep stiff columns in the well. For the construction of ultra-deep stiff columns over 20m, there is currently no effective solution. Summary of the Invention

[0004] The purpose of the present invention is to provide a recoverable positioning and adjusting device and method for ultra-deep stiff columns, which not only meets the construction requirements of ultra-deep stiff columns, but also has the advantage of being recoverable, effectively reducing the construction cost.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A recoverable positioning and adjusting device for ultra-deep stiff columns, comprising:

[0006] A tool pipe, the tool pipe having a top flange and a bottom flange;

[0007] A working section, the working section having a top flange for connecting the tool pipe and a connecting female head for connecting a transition section. A plurality of upper hinge supports and lower hinge supports are uniformly distributed along the circumferential direction on the outer circumferential surface of the working section. The connecting female head is provided with a mounting seat for fixing a plurality of centering push rods and external pin holes corresponding to the centering push rods one by one;

[0008] A transition section, the transition section having a connecting flange for connecting a stiff column steel pipe and a connecting male head for sleeving the connecting female head. A plumb ring plate for cooperating with a claw to achieve plumb adjustment is provided on the outer circumferential surface of the transition section. The connecting male head is provided with a centering ring plate for abutting against the centering push rods and internal pin holes corresponding to the external pin holes one by one; the outer diameter of the connecting male head is smaller than the inner diameter of the connecting female head;

[0009] The vertical adjustment push rod, the number of the vertical adjustment push rods is equal to that of the upper hinge supports, and the vertical adjustment push rods are hingedly installed on the corresponding upper hinge supports;

[0010] The claw, the number of the claws is equal to that of the upper hinge supports, and the claw has a hinged end for connecting the corresponding vertical adjustment push rod, a hinged part for connecting the corresponding lower hinge support, and a clamping hook for clamping the vertical adjustment ring plate;

[0011] The centering push rod, the centering push rod is installed on the mounting seat and is aligned with the pin holes on the connecting female head one by one, and the push rod of the centering push rod is used for centering adjustment by abutting against the centering ring plate;

[0012] The inclination sensor, the inclination sensor is arranged on the tool pipe and generates an inclination signal according to the inclination of the tool pipe;

[0013] The vertical adjuster, the vertical adjuster is connected to the inclination sensor and calculates the offset according to the inclination signal.

[0014] Furthermore, a fine adjustment plate is hingedly installed on the clamping hook of the claw, a fine adjustment screw is installed on the fine adjustment plate, and the end of the fine adjustment screw abuts against the clamping surface of the clamping hook.

[0015] Furthermore, the size of the top flange of the working section is larger than the size of the bottom flange of the tool pipe, so as to cover all the components on the working section.

[0016] Furthermore, a fixed ring plate is further arranged on the outer cylindrical surface of the transition section, the fixed ring plate is located below the vertical adjustment ring plate, and the distance between the two can allow the clamping hook of the claw to enter.

[0017] Furthermore, a plurality of connecting rib plates are connected between the fixed ring plate and the vertical adjustment ring plate, and the inner ends of the connecting rib plates are connected to the outer cylindrical surface of the transition section.

[0018] Furthermore, the number of the upper hinge supports, the lower hinge supports and the claws is three, and the number of the mounting seats and the centering push rods is four.

[0019] Furthermore, both the vertical adjustment push rod and the centering push rod are hydraulic push rods.

[0020] The present invention also provides a method for positioning and adjusting a recyclable ultra-deep stiff column, including the following steps:

[0021] Step 1: Use a hoisting device to place the stiff column steel pipe connected with the transition section into the well hole, and suspend it in the well hole by a support on the vertical adjustment frame;

[0022] Step 2: Use a hoisting device to move the tool pipe, the working section and its accessories to the wellhead, and make the connecting female head of the working section form a socket joint with the connecting male head of the transition section;

[0023] Step 3: Use the centering function of the plumb frame at the wellhead to align the center of the working section with the center line of the wellbore;

[0024] Step 4: Use the centering push rod on the working section to coaxially align the center line of the transition section with the center line of the working section. At the same time, use the centering push rod to axially connect the connecting female head and the connecting male head;

[0025] Step 5: Use a theodolite, a plumb instrument, an inclination sensor on the tool pipe, and a claw controlled by a plumb push rod on the working section to adjust the inclination angle of the transition section to within a set range;

[0026] Step 6: Further lift the tool pipe, open the support on the plumb frame, then lower the tool pipe, place the stiffening column steel pipe into the preset position in the wellbore, adjust the four oil cylinders preset at corresponding positions on the tool pipe to make the readings of the instrument within the preset accuracy range, then fix the working section, pour concrete into the hole to the preset height and dynamically detect that the readings of the instrument are always within the accuracy range. After pouring is completed, recover the inclination sensor. After the concrete cures, loosen the claw and recover the tool pipe, the working section and its accessories.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The adjustment device in the present invention combines the construction method in the applicant's prior patent, can realize the in-well construction of ultra-deep stiffening columns, and the adjustment result is accurate and reliable, meeting the plumb requirements of ultra-deep stiffening columns and improving the accuracy and efficiency of the project.

[0029] 2. Both the rough adjustment and the fine adjustment in the present invention are completed by the components at the same position, which can ensure the accuracy and reliability of the adjustment result to the greatest extent.

[0030] 3. The tool pipe, the working section and their accessories in the adjustment device of the present invention can be recovered after construction for repeated use next time. The recovery operation is also simple and fast, reducing the project construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a three-dimensional structure diagram of a preferred embodiment of the present invention;

[0032] Figure 2 is Figure 1 the front view of the structure of the embodiment shown;

[0033] Figure 3 is Figure 1 the structural cross-sectional view in the A-A direction of;

[0034] Figure 4 isFigure 3 Partial enlarged view at B in the middle;

[0035] Figure 5 is Figure 1 Schematic structural view of the shown embodiment during operation;

[0036] Figure 6 is Figure 1 Schematic principle view of the shown embodiment during operation. Specific implementation manner

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] As Figures 1 to 6 shown, a recyclable ultra-deep stiff column positioning and adjusting device includes: a tool pipe 6, a working section 1, a transition section 5, a plumb push rod 2, a claw 3, a centering push rod 4, an inclination sensor, and a plumb bob.

[0039] The tool pipe 6 is a circular steel pipe, which has a top flange 6.2 and a bottom flange 6.1. The tool pipe 6 is provided with more than one section, and the length of the tool pipe is determined in advance according to the depth of the embedded part. Generally, the length of a single tool pipe 6 is about 9 m. For a 40-meter-deep wellbore 200, the number of tool pipes 6 is 3. The tool pipe 6 can adjust the center point, verticality, and elevation, so as to adjust the position of the fixed stiff column in the hole. The top flange 6.1 of the first tool pipe 6 is connected to the steel wire rope of the crane, and the bottom flange 6.1 of the last tool pipe 6 is connected to the top flange 1.1 of the working section 1.

[0040] The working section 1 is a circular steel pipe, which has a top flange 1.1 and a connecting male head 1.2. Three upper hinge supports 1.3 and lower hinge supports 1.4 are evenly distributed along the circumferential direction on the outer circular surface of the working section 1. The connecting male head 1.2 is provided with a mounting seat 1.5 for fixing four centering push rods 4 and external sales holes corresponding to the centering push rods 4 one by one. For the convenience of transportation and installation, the size of the top flange 1.1 of the working section 1 is larger than the size of the bottom flange 6.1 of the tool pipe 6, so as to cover all the components on the working section 1 and prevent objects from falling from above and damaging the equipment or components below during the construction process, playing a protective role.

[0041] The transition section 5 has a connecting flange 5.1 for connecting the steel pipe 100 of the stiffening column and a connecting male head 5.2 for sleeving the connecting female head 1.2. The connecting flange 5.1 is at the bottom of the transition section 5, and the connecting male head 5.2 is at the top of the transition section 5. A plumb bob adjusting ring plate 5.3 for cooperating with the pulling claw 3 to achieve plumb bob adjustment is arranged on the outer circumferential surface of the transition section 5. The connecting male head 5.2 is provided with a centering ring plate 5.5 for abutting against the centering push rod 4 and internal pin holes corresponding to the external pin holes one by one. The outer diameter of the connecting male head 5.2 is smaller than the inner diameter of the connecting female head 1.2, so that the connecting female head 1.2 of the working section 1 is sleeved outside the connecting male head 5.2 of the transition section 5. Positioning steps are arranged at the roots of both the connecting male head 5.2 and the connecting female head 1.2, so that positioning sleeving can be achieved when the two are sleeved, ensuring that the pin holes can be aligned and facilitating the insertion of the centering push rod 4.

[0042] The number of plumb bob adjusting push rods 2 is equal to that of the upper hinge supports 1.3, and they are hingedly installed on the corresponding upper hinge supports 1.3;

[0043] The number of pulling claws 3 is equal to that of the upper hinge supports 1.3. It has a hinged end for connecting the corresponding plumb bob adjusting push rod 2, a hinged part for connecting the corresponding lower hinge support 1.4, and a clamping hook for clamping the plumb bob adjusting ring plate 5.3. Driven by the plumb bob adjusting push rod 2, the clamping hook of the pulling claw 3 can rotate around the hinged part, so as to extend below the plumb bob adjusting ring plate 5.3 for plumb bob adjustment operation.

[0044] The centering push rod 4 is installed on the mounting seat 1.5 and is aligned with the pin holes on the connecting female head 1.2 one by one. Its push rod is adjusted for centering by abutting against the centering ring plate 5.5. The mounting seats 1.5 are evenly distributed in the circumferential direction and can adjust in four directions during the centering adjustment process of the centering push rod 4. The function of the centering push rod 4 is in two aspects. On the one hand, it is used as a pin to axially fix the connecting male head 5.2 and the connecting female head 1.2, and on the other hand, it is used to adjust the coaxial alignment of the connecting male head 5.2 and the connecting female head 1.2.

[0045] The inclination sensor is arranged on the tool pipe 6 and generates an inclination signal according to the inclination of the tool pipe 6. The installation point of the inclination sensor is preset, the distance H between it and the suspension point is a known quantity, and the reasonable range of the offset is also a known quantity. The inclination sensor can obtain the inclination angle θ of the current steel pipe 100 of the stiffening column.

[0046] The plumb bob adjuster is connected to the inclination sensor and calculates the offset L according to the inclination signal. As Figure 6As shown, according to the relationship tanθ = L / H, the specific value of the offset L can be calculated, and finally the offset L is controlled within a reasonable range. It can be known that for the tool pipe 6, its length is relatively long, so a small inclination will cause an obvious offset. Therefore, using the inclination angle to calculate the offset and adjusting according to the offset can be more accurate and reliable. The larger the distance H is, the more accurate the adjustment of the offset L will be.

[0047] In order to make the plumb adjustment result more accurate, a fine-tuning plate 7 is hinged to the clamping hook of the pulling claw 3, and a fine-tuning screw 8 is installed on the fine-tuning plate 7. The end of the fine-tuning screw 8 abuts against the clamping surface of the clamping hook. During plumb adjustment, the angle of the fine-tuning plate 7 is fixed. At this time, the contact between the plate surface of the fine-tuning plate 7 and the plumb ring plate 5.3 is used to adjust the overall verticality. After approaching the requirements, then by rotating the fine-tuning screw 8, the inclination angle of the fine-tuning plate 7 is changed by the advancing distance of the fine-tuning screw 8 until the requirements are met, so as to achieve precise adjustment of the rigid column steel pipe 100.

[0048] In order to pre-support the transition section 5 before adjustment, a fixed ring plate 5.4 is also provided on the outer circular surface of the transition section 5. The fixed ring plate 5.4 is located below the plumb ring plate 5.3, and the distance between the two can allow the clamping hook of the pulling claw 3 to enter. A support member for supporting the fixed ring plate 5.4 is provided in the well hole 200. The support member provides a support function in the early stage, and the support member can be removed after the plumb adjustment is completed to facilitate the lowering of the rigid column.

[0049] In order to improve the connection strength between the fixed ring plate 5.4 and the plumb ring plate 5.3, a number of connecting rib plates 5.6 are connected between the fixed ring plate 5.4 and the plumb ring plate 5.3, and the inner ends of the connecting rib plates 5.6 are connected to the outer circular surface of the transition section 5.

[0050] Both the plumb push rod 2 and the centering push rod 4 are hydraulic push rods.

[0051] It should be noted that the fixed connections between the relevant components in the present invention are made by welding or fastener connections. For example, the hinge supports and various ring plates are all fixed by welding, and various push rods and pipe bodies are connected by fasteners.

[0052] The present invention also provides a recoverable positioning and adjustment method for ultra-deep rigid columns, including the following steps:

[0053] Step 1: Use a lifting device such as a crane to place the rigid column steel pipe 100 connected with the transition section 5 into the well hole 200, and suspend it in the well hole 200 by the support member on the plumb frame. The support member on the plumb frame 400 can support the transition section 5 after the adjustment mechanism is closed, and can allow the transition section 5 to be normally lowered to the preset position in the well after being opened.

[0054] Step 2: Continue to use the crane to move the tool pipe, working section 1 and its accessories to the wellhead, and make the connecting male head 1.2 of the working section 1 form a socket connection with the connecting female head 5.2 of the transition section 5.

[0055] Step 3: Use the centering device of the plumb bob frame 400 at the wellhead to align the center of the working section 1 with the center line of the well hole 200.

[0056] Step 4: Use the centering push rod 4 on the working section 1 to coaxially align the center line of the transition section 5 and the center line of the working section 1. Specifically, all the centering push rods 4 work. When all four centering push rods 4 are fully pushed against the centering ring plate 5.5, the working section 1 and the transition section 5 are aligned. At the same time, use the centering push rod 4 to axially connect the connecting male head 1.2 and the connecting female head 5.2. After the connecting male head 1.2 and the connecting female head 5.2 are connected, the stiffening column steel pipe 100 and the transition section 5 form an integral body with the upper working section 1.

[0057] Step 5: Use the theodolite, plumb bob instrument, the inclination sensor on the tool pipe 6, and the claw 3 controlled by the plumb bob push rod 2 on the working section 1 to adjust the inclination angle of the transition section 5 to the set range. A fine-tuning plate 7 is also provided on the claw 3. During plumb bob adjustment, first use the fine-tuning plate 7 with a fixed angle for rough adjustment to make the overall offset close to the preset range, and then turn the fine-tuning screw 8 for fine adjustment to finally meet the preset requirements.

[0058] Step 6: Further lift the tool pipe 6, open the support on the plumb bob frame, and then lower the tool pipe 6. Place the stiffening column steel pipe 100 into the preset position in the well hole 200. Adjust the four oil cylinders preset at the corresponding positions on the tool pipe 6 to make the readings of the instrument within the preset accuracy range. Then fix the working section 1, pour concrete into the hole to the preset height and dynamically detect that the instrument readings are always within the accuracy range. After pouring is completed, recover the inclination sensor. After the concrete cures for 10 h, loosen the claw 3 and recover the tool pipe 6, the working section 1 and its accessories.

[0059] It should be noted that during the implementation of Steps 1 to 6, the construction processes of the relevant steps can be completed with reference to the construction method in the Chinese patent with the application number 202210628493.8.

[0060] For the parts not detailed in the present invention, they are all well-known technologies to those skilled in the art.

[0061] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it should not be construed as a limitation to the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0062] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0063] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified and equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A recyclable positioning and adjustment device for ultra-deep stiff columns, characterized in that: Comprising: A tool pipe (6), the tool pipe having a top flange (6.2) and a bottom flange (6.1); A working section (1), the working section (1) having a top flange (1.1) for connecting the tool pipe and a connecting female head (1.2) for connecting a transition section (5). A plurality of upper hinge supports (1.3) and lower hinge supports (1.4) are uniformly distributed along the circumferential direction on the outer circumferential surface of the working section (1). The connecting female head (1.2) is provided with a mounting seat (1.5) for fixing a plurality of centering push rods (4) and external pin holes corresponding to the centering push rods (4) one by one; A transition section (5), the transition section (5) having a connecting flange (5.1) for connecting a stiffening column steel pipe (100) and a connecting male head (5.2) for sleeving the connecting female head (1.2). A plumb bob adjusting ring plate (5.3) for cooperating with a claw (3) to achieve plumb bob adjustment is provided on the outer circumferential surface of the transition section (5). The connecting male head (5.2) is provided with a centering ring plate (5.5) for abutting against the centering push rod (4) and internal pin holes corresponding to the external pin holes one by one; the outer diameter of the connecting male head (5.2) is smaller than the inner diameter of the connecting female head (1.2); Plumb bob adjusting push rods (2), the number of plumb bob adjusting push rods (2) being equal to the number of upper hinge supports (1.3), and being hingedly mounted on the corresponding upper hinge supports (1.3); Claws (3), the number of claws (3) being equal to the number of upper hinge supports (1.3), having a hinged end for connecting the corresponding plumb bob adjusting push rod (2), a hinged portion for connecting the corresponding lower hinge support (1.4), and a clamping hook for clamping the plumb bob adjusting ring plate (5.3); Centering push rods (4), the centering push rods (4) being mounted on the mounting seat (1.5) and being aligned with the pin holes on the connecting female head (1.2) one by one, and the push rods thereof being adjusted for centering by abutting against the centering ring plate (5.5); An inclination sensor, the inclination sensor being provided on the tool pipe (6) and generating an inclination signal according to the inclination of the tool pipe (6); A plumb bob adjuster, the plumb bob adjuster being connected to the inclination sensor and calculating the offset according to the inclination signal.

2. The recyclable ultra-deep stiff column positioning and adjusting device according to claim 1, characterized in that: A fine adjustment plate (7) is hingedly mounted on the clamping hook of the claw (3), and a fine adjustment screw (8) is mounted on the fine adjustment plate (7), and the end of the fine adjustment screw (8) abuts against the clamping surface of the clamping hook.

3. The recyclable ultra-deep stiff column positioning and adjusting device according to claim 1, characterized in that: The size of the top flange (1.1) of the working section (1) is larger than the size of the bottom flange (6.1) of the tool pipe (6), so as to cover all components on the working section (1).

4. The recyclable ultra - deep stiff column positioning and adjusting device according to claim 1, characterized in that: A fixing ring plate (5.4) is further provided on the outer circumferential surface of the transition section (5), the fixing ring plate (5.4) being located below the plumb bob adjusting ring plate (5.3), and the distance between the two being such that the clamping hook of the claw (3) can enter.

5. The recyclable ultra-deep stiff column positioning and adjusting device according to claim 4, characterized in that: A plurality of connecting rib plates (5.6) are connected between the fixing ring plate (5.4) and the plumb bob adjusting ring plate (5.3), and the inner ends of the connecting rib plates (5.6) are connected to the outer circumferential surface of the transition section (5).

6. A recyclable ultra-deep stiff column positioning and adjusting device according to any one of claims 1 to 5, characterized in that: The number of the upper hinge supports (1.3), lower hinge supports (1.4) and pull claws (3) is three each, and the number of the mounting seats (1.5) and centering push rods (4) is four each.

7. A recyclable ultra-deep stiff column positioning and adjusting device according to any one of claims 1 to 5, characterized in that: Both the plumb adjustment push rod (2) and the centering push rod (4) are hydraulic push rods.

8. A method for positioning and adjusting a recyclable ultra - deep stiff column, characterized in that: It includes the following steps: Step 1: Use a hoisting device to place the stiffening column steel pipe (100) connected with the transition section (5) into the well hole (200), and suspend it in the well hole (200) by the support on the plumb adjustment frame. Step 2: Use a hoisting device to move the tool pipe and the working section (1) and its accessories to the wellhead, and make the connecting female head (1.2) of the working section (1) form a socket joint with the connecting male head (5.2) of the transition section (5). Step 3: Use the centering function of the plumb adjustment frame (400) at the wellhead to adjust the center of the working section (1) to be aligned with the center line of the well hole (200). Step 4: Use the centering push rod (4) on the working section (1) to adjust the center lines of the transition section (5) and the working section (1) to be coaxially aligned, and at the same time use the centering push rod (4) to axially connect the connecting female head (1.2) and the connecting male head (5.2). Step 5: Use a theodolite, a plumb level, the inclination sensors on the tool pipe (6) and the pull claws (3) controlled by the plumb adjustment push rod (2) on the working section (1) to adjust the inclination angle of the transition section (5) to within the set range. Step 6: Further hoist the tool pipe (6), open the support on the plumb adjustment frame, then lower the tool pipe (6), place the stiffening column steel pipe (100) into the preset position in the well hole (200), adjust the four oil cylinders preset at the corresponding positions on the tool pipe (6) to make the readings of the instruments within the preset accuracy range, then fix the working section (1), pour concrete into the hole to the preset height and dynamically detect that the readings of the instruments are always within the accuracy range. After pouring is completed, recover the inclination sensors. After the concrete solidifies, release the pull claws (3), and recover the tool pipe (6), the working section (1) and its accessories.

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