Deep hole fracture screw rod dismounting process method

Abstract

The invention discloses a deep hole broken screw dismantling process method, and relates to the field of hydroelectric generation installation and maintenance. The method comprises the following steps that the diameter of a fracture part of a falling section of a fractured broken screw is measured, the size of an embedded steel bar inner circle in a hoop head is turned in a matched mode, the embedded steel bar inner circle of the hoop head is in interference fit with the upper section of the left fractured screw, and a left-hand thread at the tail of the hoop head is connected and combined with a proper lengthened pipe sleeve to form the dismantling tool. The dismantling tool is placed in the deep hole pipe sleeve and is slowly aligned to be connected with the left broken screw, the buttress and the jack are placed at the bottom of the dismantling tool, the jack is used for jacking the dismantling tool, so that the hoop head is slowly in interference fit with the upper section of the broken screw, and a striking wrench or a pneumatic wrench is used for screwing the hexagon of the lengthened pipe sleeve to dismantle the screw. By the adoption of the deep hole broken screw dismantling process method, the left broken long screw can be taken out smoothly, and the deep hole broken screw dismantling process method has the advantages of being simple in structure, low in cost, high in universality, convenient to use and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydropower installation and maintenance, in particular to a deep hole broken screw dismounting process. BACKGROUND

[0002] The water turbine seat ring is the core component of the water turbine generator set, and the seat ring needs to be rooted with the concrete to form a fixed entity. During the operation of the unit, the seat ring is affected by the water pressure, and there is often a large water thrust affecting the safety of the seat ring. Therefore, long tensioning screws embedded in the concrete are usually used for seat ring tensioning work.

[0003] The length of the long tensioning screw usually reaches more than 2-3 meters, which is pre-buried in the concrete by using an external deep hole pipe sleeve. After the unit is completed, the long tensioning screw is tensioned by using a tensioner to balance the water pressure on the seat ring. Due to manufacturing quality problems, there is a possibility of fracture of the long tensioning screw during the final pre-tightening after the final installation of the unit. Since the long tensioning screw is embedded in the deep hole, the space is limited, and it is very difficult to remove.

[0004] The conventional scheme is to give sufficient safety margin in the design stage. Within a certain range of broken tensioning screws, the screws are not removed, and the safety operation requirements of the unit can still be met. With the development of the hydropower industry, large and high-head units have become common types of units. The number of long tensioning screws embedded and the tensioning force generated have reached the design limit of the unit. Therefore, when the long tensioning screw is broken, the broken screw should be removed in time and replaced with a new tensioning screw. SUMMARY

[0005] The purpose of the present application is to solve the problem that the long tensioning screw may be broken during the final pre-tightening, and the long tensioning screw is embedded in the deep hole, the space is limited, and it is very difficult to remove. A deep hole broken screw dismounting process is provided.

[0006] To achieve the above purpose, the present application realizes the following technical scheme:

[0007] A deep hole broken screw dismounting process, the operation steps are as follows:

[0008] S1, a hoop head is made according to the size of the broken section of the broken screw falling section;

[0009] S2, a lengthened pipe sleeve is made according to the length of the broken falling section of the long screw;

[0010] S3, the upper section of the broken screw is dismounted using the hoop head and the lengthened pipe sleeve.

[0011] Further, the hoop head making in S1 is divided into five steps:

[0012] S11, measure the diameter of the broken section of the broken screw falling section;

[0013] S12, the inner circle of the hoop head is processed according to the diameter of the broken screw falling section measured + 2mm, and an 8°-10° inclined surface guide section is processed at the outlet position;

[0014] S13, 8 symmetrical directions of the hoop head are welded with a plant, and the width is 3-5mm;

[0015] S14, the inner circle of the hoop head is reprocessed according to the diameter of the broken screw falling section measured -0.5mm, and 4 symmetrical direction notch grooves are cut at the outlet of the hoop head;

[0016] S15, a left-handed internal thread hole is processed at the tail of the hoop head.

[0017] Further, the S2 lengthening pipe sleeve manufacturing is divided into four steps:

[0018] S21, the length of the broken screw falling section is measured;

[0019] S22, the lengthening pipe sleeve is manufactured according to the length of the broken screw falling section + 200mm;

[0020] S23, the top of the lengthening pipe sleeve is manufactured into a left-handed external thread matched with the left-handed internal thread at the tail of the hoop head;

[0021] S24, the bottom of the lengthening pipe sleeve is processed into a hexagon.

[0022] Further, the S3 using the hoop head and the lengthening pipe sleeve to remove the upper section of the broken screw is divided into four steps:

[0023] S31, the hoop head and the lengthening pipe sleeve are connected and combined into a removal tool by using a left-handed thread;

[0024] S32, the removal tool is placed into the deep hole pipe sleeve, and slowly aligned with the remaining upper section of the broken screw;

[0025] S33, the bottom of the removal tool is placed on a support and a jack, the jack is used to drive the removal tool, so that the hoop head slowly fits with the upper section of the broken screw;

[0026] S34, after the hoop head and the remaining upper section of the broken screw are completely matched, the hexagon of the lengthening pipe sleeve is twisted by using a striking wrench or a pneumatic wrench, and the upper section of the broken screw is removed.

[0027] Further, the lengthening pipe sleeve can adopt a left-handed thread joint sectional structure.

[0028] Further, the gap between the upper section of the broken screw and the hoop head is filled with a filling mechanical repair glue or a welding glue.

[0029] The beneficial effects of the present application are:

[0030] 1. The deep hole broken screw dismounting process method of the present application can effectively form an interference fit with the broken screw left in the deep hole and provide sufficient friction in the rotation direction to smoothly remove the left broken long screw.

[0031] 2. The dismounting device used in the present application has the characteristics of simple structure, low cost, strong universality, and convenient use, effectively improves the efficiency of dismounting the left broken long screw, and solves the problem of affecting the installation period of the unit.

[0032] 3. The deep hole broken screw dismounting process method used in the present application has the characteristics of reliability, stability, and strong universality, which can ensure the smooth dismounting of the broken screw on the construction site and solve the problem of long dismounting time and affecting the straight-line installation period of the unit.

[0033] 4. The present application can effectively solve the problem of dismounting the deep hole broken screw of the hydroelectric station unit, effectively improve the stability and reliability of the hydroelectric station unit. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a schematic diagram of the dismounting position of the deep hole broken screw of the present application;

[0035] Figure 2 is a structure diagram of the clamp head of the present application;

[0036] Figure 3 is a top view of Figure 2 ;

[0037] Figure 4 is a lengthened sleeve diagram of the present application;

[0038] Figure 5 is a schematic diagram of the use state of the present application.

[0039] In the figure: 1 - seat ring; 2 - upper segment of broken screw; 3 - fallen segment of broken screw; 4 - concrete foundation; 5 - clamp head; 6 - welded reinforcing bar; 7 - lengthened sleeve; 8 - jack; 9 - support; 10 - dismounting tool. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present application more clear and clear, the present application will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and do not limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0041] Specific embodiment one: refer to Figures 1 to 5 This embodiment is described, and the deep hole broken screw dismounting process method provided by this embodiment is realized through the following steps:

[0042] S1, according to the broken screw falling section 3 fracture size production hoop head 5;

[0043] S2, according to the broken screw falling section 3 length, production lengthening pipe sleeve 7;

[0044] S3, using hoop head 5 and lengthening pipe sleeve 7 remove broken screw upper section 2.

[0045] Specific implementation method two: refer to Figure 2 and Figure 3 This embodiment is described in the first embodiment of the steps, this embodiment is further limited to the first embodiment of the steps, in this embodiment, the S1 hoop head 5 production is divided into five steps:

[0046] S11, measure the diameter of the broken broken screw falling section 3 fracture site;

[0047] S12, production hoop head 5, hoop head 5 inner circle Φ according to the diameter of the broken screw falling section 3 fracture site + 2mm pre processing, outlet site processing 8°~10° slope guide section;

[0048] S13, in the hoop head 5 symmetrical 8 direction welding steel bar 6, width 3-5mm;

[0049] S14, reprocess hoop head 5 inner circle Φ, according to the diameter of the broken screw falling section 3 fracture site -0.5mm processing, in the hoop head 5 outlet symmetrical 4 direction cutting notch groove;

[0050] S15, in the hoop head 5 tail processing left-handed internal thread hole.

[0051] In this embodiment, because the fracture of the broken screw fracture site is relatively random, the structure of the fracture end is relatively complex, and the screw cannot be taken out after the fracture by using the suitable mechanical connection mode. The screw body. The outer circle of the screw is relatively regular in size, and the diameter of the connection part can be confirmed by measuring the diameter of the screw end of the falling section, and a hoop head with interference fit is matched and processed to achieve the purpose of disassembly. The inner part of the hoop head 5 is first processed according to the large size, and then a plurality of interference clamping ribs are welded on the inner side, which can ensure that the hoop head 5 and the outer circle of the broken screw form sufficient interference, and form extrusion and grinding with the outer circle of the broken screw during rotation, increase the torque during rotation. The notch groove is cut at the outlet of the hoop head 5, which can ensure that the hoop head has a certain deformation space during compression, so that the hoop head 5 and the end of the broken screw upper section 2 are completely locked.

[0052] Specific implementation method three: refer to Figure 4 This embodiment is described in the first embodiment of the steps, this embodiment is further limited to the first embodiment of the steps, in this embodiment, the S2 hoop head 5 production is divided into four steps:

[0053] S21, measure the length of the dropped section 3 of the broken screw;

[0054] S22, make a lengthened sleeve 7 according to the length of the dropped section 3 of the broken screw + 200 mm;

[0055] S23, make the top of the lengthened sleeve 7 into left-handed external threads to match the left-handed internal threads of the head 5 of the clamp;

[0056] S24, process the bottom of the lengthened sleeve 7 into a hexagon.

[0057] In this embodiment, the lengthened sleeve 7 matches the left-handed threads at the bottom of the head 5 of the clamp, providing the lengthening effect of the broken screw removal device and sufficient torque during the removal process to remove the broken screw.

[0058] Specific embodiment four: refer to Figure 5 This embodiment is a further limitation on step three of the specific embodiment one. In this embodiment, the removal of the upper section of the broken screw using the head 5 of the clamp and the lengthened sleeve 7 in S3 is divided into four steps:

[0059] S31, combine the head 5 of the clamp and the lengthened sleeve 7 into a removal tool 10 using left-handed threads;

[0060] S32, place the removal tool 10 into the deep hole sleeve and slowly align it with the remaining upper section 2 of the broken screw;

[0061] S33, place the support 9 and the jack 8 at the bottom of the removal tool 10, and use the jack 8 to move the removal tool 10, so that the head 5 of the clamp slowly fits with the upper section 2 of the broken screw;

[0062] S34, after the head 5 of the clamp completely fits with the remaining upper section 2 of the broken screw, use a striking wrench or a pneumatic wrench to twist the hexagon of the lengthened sleeve 7 to remove the upper section 2 of the broken screw.

[0063] In this embodiment, the removal tool 10 of the broken screw is placed into the deep hole and aligns with the remaining upper section 2 of the broken screw, and the jack 8 is used to move the removal tool 10, so that the head 5 of the clamp slowly fits with the upper section 2 of the broken screw, ensuring that the head 5 of the clamp and the outer circle of the upper section 2 of the broken screw form a sufficient interference, and that during the rotation process, the head 5 of the clamp and the outer circle of the upper section 2 of the broken screw form extrusion and grinding, and the head 5 of the clamp completely blocks the end of the upper section 2 of the broken screw, so that sufficient torque is generated during the rotation process, facilitating the smooth removal of the upper section 2 of the broken screw.

[0064] Specific embodiment five: refer to Figure 4The embodiment is further limited to step two of the third embodiment, and the lengthened sleeve 7 is connected by left-handed threads and has a segmented structure.

[0065] In the embodiment, the fracture position of the broken screw is random, and the length of the reserved screw after fracture is different. If there are multiple broken screws on site, the lengthened sleeve 7 can be made into a segmented structure to improve the utilization rate of disassembly and assembly. The segmented screws should be connected by left-handed threads because the disassembly work is in a left-handed mode.

[0066] The sixth embodiment is described with reference to the fourth embodiment. Figure 5 The embodiment is further limited to step two of the fourth embodiment, and the gap between the broken screw upper segment 2 and the clamp head 5 is filled with mechanical repair glue or welding glue during assembly.

[0067] In the embodiment, the fracture end structure is complex, and the gap between the clamp head 5 and the broken screw upper segment 2 is large if the fracture is particularly uneven. To improve the reliability of the connection, mechanical repair glue or welding glue can be filled in the gap between the broken screw upper segment 2 and the clamp head 5. After the filler is solidified, the disassembly operation can be performed, which can effectively improve the friction force of the connection part.

[0068] The above detailed description of the present application is general, but some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, the modifications or improvements without departing from the spirit of the present application are within the scope of the present application.

Claims

1. A process for the removal of a broken screw from a deep hole characterized in that, The operation steps are as follows: S1, according to the broken screw falling section (3) fracture size, make the hoop head (5); S2, according to the length of the broken screw falling section (3), make the lengthened pipe sleeve (7); S3, use the hoop head (5) and the lengthened pipe sleeve (7) to remove the broken screw upper section (2); The S3 uses the hoop head (5) and the lengthened pipe sleeve (7) to remove the broken screw upper section (2) and is divided into four steps: S31, the hoop head (5) and the lengthened pipe sleeve (7) are combined into a removal tool (10) by using left-handed thread connection; S32, the removal tool (10) is placed into the deep hole pipe sleeve, and the left broken screw upper section (2) is slowly aligned; S33, the bottom of the removal tool (10) is placed on the support (9) and the jack (8), the removal tool (10) is driven by the jack (8), so that the hoop head (5) slowly cooperates with the left broken screw upper section (2); S34, after the hoop head (5) and the left broken screw upper section (2) are completely matched, the hex of the lengthened pipe sleeve (7) is twisted by the impact wrench or the pneumatic wrench, and the broken screw upper section (2) is removed.

2. A process for removing a broken screw from a deep hole as claimed in claim 1, wherein: The hoop head (5) in the S1 is made in five steps: S11, measure the diameter of the broken broken screw falling section (3) fracture part; S12, make the hoop head (5), the inner circle Φ of the hoop head (5) is preprocessed according to the diameter of the broken broken screw falling section (3) fracture part + 2mm, and an 8°~10° inclined surface guide section is processed at the outlet part; S13, symmetrically weld the embedded steel bars (6) in 8 directions in the hoop head (5), with a width of 3-5mm; S14, reprocess the inner circle Φ of the hoop head (5), according to the diameter of the broken broken screw falling section (3) fracture part -0.5mm, and cut out the notch groove in 4 symmetric directions at the outlet of the hoop head (5); S15, process the left-handed internal thread hole at the tail of the hoop head (5).

3. A process for the removal of a broken screw from a deep hole as claimed in claim 2, wherein: The lengthened pipe sleeve (7) in the S2 is made in four steps: S21, measure the length of the broken screw falling section (3); S22, according to the length of the broken screw falling section (3) + 200mm, make the lengthened pipe sleeve (7); S23, make the top of the lengthened pipe sleeve (7) into a left-handed external thread matched with the left-handed internal thread at the tail of the hoop head (5); S24, process the hex at the bottom of the lengthened pipe sleeve (7).

4. A process for the removal of a deep hole fractured screw according to claim 3, wherein: The lengthened pipe sleeve (7) adopts left-handed thread connection sectional structure.

5. A process for the removal of a deep hole fractured screw according to claim 4, wherein: The gap between the broken screw upper section (2) and the hoop head (5) is filled with filling mechanical repair glue or welding glue.

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