CN110936326B - Method for dismantling foundation bolts of PTR (Power plant) refueling water tank of nuclear power plant - Google Patents
Method for dismantling foundation bolts of PTR (Power plant) refueling water tank of nuclear power plant Download PDFInfo
- Publication number
- CN110936326B CN110936326B CN201911100196.0A CN201911100196A CN110936326B CN 110936326 B CN110936326 B CN 110936326B CN 201911100196 A CN201911100196 A CN 201911100196A CN 110936326 B CN110936326 B CN 110936326B
- Authority
- CN
- China
- Prior art keywords
- bolt
- power plant
- water tank
- drill
- drilling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
Abstract
A method for dismantling foundation bolts of a PTR refueling water tank of a nuclear power plant comprises the following steps: firstly, removing a gasket and a lower nut below a floor slab; secondly, the bolt is positioned in the steel sleeve, and a percussion drill chisels grouting materials into the steel sleeve from the lower part of the floor along the periphery of the bolt so as to determine the relative position between the bolt and the steel sleeve; step three, drilling a hole near the position of the bolt by using a percussion drill for installing a drill support; fourthly, temporarily fixing a drilling machine bracket at the lower part of the floor slab, and installing a water drilling machine; then adjusting the extension sleeve to penetrate between the bolt with the grouting materials removed and the steel sleeve, and ensuring that the central line of the extension sleeve and the central line of the bolt are kept on the same line, so that the drilling machine support is completely fixed, and the hydraulic drilling machine is ensured not to displace in the drilling process; and step five, connecting a water drilling machine and starting the equipment.
Description
Technical Field
The invention relates to the field of operation safety of nuclear power plants, in particular to a device and a method for dismounting foundation bolts of a PTR (Power plant) refueling water tank of a nuclear power plant.
Background
The reactor refueling water pool and spent fuel water pool cooling and processing system (PTR for short) is a primary auxiliary system of the M310 nuclear power plant, and is used for bearing the nuclear power safety function, ensuring the durable cooling of a spent fuel element storage pool and the water filling, water draining and evolution of the reactor refueling water pool.
The PTR system is provided with a refueling water tank with the total volume of 1763m3Mounting ofOutside the reactor plant of the nuclear power plant, two important functions are undertaken: 1) under the condition that a reactor has a loss of coolant accident, the refueling water tank provides an emergency water source for the reactor core of the reactor; 2) when the reactor is reloaded, the reloading water tank realizes water filling and water draining of the reactor pool.
At present, the foundation bolt of the nuclear power PTR refueling water tank is made of 42CrMoE with the specification of M85x 2350. Due to long-term use or other reasons, the mechanical performance of the foundation bolt is reduced, and the functional requirements cannot be guaranteed, so that the anti-seismic performance of the PTR refueling water tank cannot be guaranteed, and the safe operation of the nuclear power unit cannot be guaranteed.
Disclosure of Invention
The invention aims to: the utility model provides a PTR of nuclear power plant reloads water tank rag bolt and demolishs scheme, the problem of demolishs when solving PTR reloads water tank rag bolt performance and can't guarantee, avoids influencing nuclear power plant PTR reloads water tank's usability because of rag bolt demolishs simultaneously, guarantees nuclear power unit operation safety and stability.
The technical scheme of the invention is as follows: a method for dismantling foundation bolts of a PTR refueling water tank of a nuclear power plant comprises the following steps:
firstly, removing a gasket and a lower nut below a floor slab;
secondly, the bolt is positioned in the steel sleeve, and a percussion drill chisels grouting materials into the steel sleeve from the lower part of the floor along the periphery of the bolt so as to determine the relative position between the bolt and the steel sleeve;
step three, drilling a hole near the position of the bolt by using a percussion drill for installing a drill support;
fourthly, temporarily fixing a drilling machine bracket at the lower part of the floor slab, and installing a water drilling machine; then adjusting the extension sleeve to penetrate between the bolt with the grouting materials removed and the steel sleeve, and ensuring that the central line of the extension sleeve and the central line of the bolt are kept on the same line, so that the drilling machine support is completely fixed, and the hydraulic drilling machine is ensured not to displace in the drilling process;
and step five, connecting a water drilling machine and starting the equipment.
And in the second step, chiseling grouting slurry from the lower part of the floor slab along the periphery of the bolt into the steel sleeve by using a percussion drill, wherein the depth is 20-25 cm.
In the second step, the drilling of the bolt or the damage to the steel sleeve in the drilling process is avoided.
In the third step, the drill support is DD-HD 30.
And in the third step, a hole with the diameter of 16mm is drilled near the position of the bolt by adopting a percussion drill.
And fifthly, in the drilling process, the drilling speed is controlled, the sound and the hand feeling of a rocker of the hydraulic drilling machine in the drilling process are heard, if the sound is abnormal suddenly or the rocker of the hydraulic drilling machine is heavy suddenly, the drilling operation is stopped immediately, the drill bit is withdrawn, and whether the drill bit deviates or touches a steel sleeve or a bolt is checked.
And step five, if the length of the extension sleeve is insufficient in the drilling process, adding a new section of extension sleeve.
In the fifth step, when each section of the extension sleeve is added, rechecking is carried out, and if the eccentricity exists, timely adjustment is carried out.
In the fifth step, when the drill reaches the depth of 1.5 meters, the drilling speed needs to be reduced, and the drill is stopped and withdrawn from the extension sleeve immediately after the drill reaches the depth of 1.61 meters.
The invention has the following remarkable effects:
the problem of during the unit operation, PTR reloads water tank rag bolt when the service function can't be guaranteed because long-term use or other reasons lead to mechanical properties to descend, make PTR reloading water tank anti-seismic performance descend is solved.
The PTR reloading water tank unqualified foundation bolt is dismantled by adopting two dismantling schemes of from top to bottom and from bottom to top, so that the foundation bolt can be replaced newly, the anti-seismic performance of the PTR reloading water tank of the nuclear power unit is ensured, the operation safety of the nuclear power unit is improved, and the safe, stable and efficient operation of the nuclear power unit is guaranteed.
Drawings
FIG. 1 is a schematic diagram of a nuclear power plant PTR refueling water tank;
FIG. 2 is an enlarged fragmentary view of FIG. 1;
FIG. 3 is a schematic view of a steel sleeve and bolt;
FIG. 4 is a schematic view of a water drilling machine;
in the figure: 1-PTR refueling water tank 2-upper nut 4-gasket 5-lower nut, 6-floor, 7-steel sleeve, 8-bolt, 9-drill support and 10-water drill
Detailed Description
A method for dismantling foundation bolts of a PTR refueling water tank of a nuclear power plant comprises the following steps:
firstly, removing a gasket 4 and a lower nut 5 below a floor slab 6;
secondly, the bolt 8 is positioned in the steel sleeve 7, and a percussion drill chisels grouting materials into the steel sleeve 7 from the lower side of the floor 6 along the periphery of the bolt 8, wherein the depth is 20-25 cm, so that the relative position between the bolt 8 and the steel sleeve 7 is determined, and the bolt is prevented from being drilled in the drilling process or the steel sleeve-7 is prevented from being damaged;
step three, drilling a hole with the diameter of 16mm near the position of the bolt 8 by using a percussion drill, and installing a drill support 9; the drill support 9 is DD-HD30
And step four, temporarily fixing the drilling machine bracket 9 at the lower part of the floor slab 6, and installing the water drilling machine 10. Then adjusting an extension sleeve 11 to penetrate between the bolt 8 and the steel sleeve 7, of which the grouting material is chiseled off, so as to ensure that the central line of the extension sleeve 11 and the central line of the bolt 8 are kept on the same line, completely fix a drill support 9 and ensure that the water drilling machine 10 does not displace in the drilling process;
step five, switching on the water drilling machine 10 and starting the equipment; during the drilling process, the drilling speed should be controlled, and the drilling speed should not be too fast and kept uniform. Meanwhile, the sound and the hand feeling of the rocker 12 of the water drilling machine in the drilling process are noticed, if the sound is abnormal suddenly or the rocker 12 of the water drilling machine is heavy suddenly, the drilling operation needs to be stopped immediately, the drill bit needs to be withdrawn, and whether the drill bit deviates or the steel sleeve 7 or the bolt 8 needs to be detected.
If the length of the extension sleeve 11 is insufficient in the drilling process, a new section of the extension sleeve 11 is added; when a section of the extension sleeve 11 is added, rechecking is carried out, and if the eccentricity exists, the adjustment is carried out in time. When drilling to a depth of 1.5 m, the drilling speed is reduced, and the drilling is stopped and the extension sleeve 11 is withdrawn immediately after the drilling to a depth of 1.61 m.
Claims (9)
1. A nuclear power plant PTR refueling water tank foundation bolt dismantling method is characterized by comprising the following steps: the method comprises the following steps:
firstly, removing a gasket (4) and a lower nut (5) below a floor slab (6);
secondly, the bolt (8) is positioned in the steel sleeve (7), and a percussion drill chisels grouting slurry into the steel sleeve (7) from the lower part of the floor (6) along the periphery of the bolt (8) so as to determine the relative position between the bolt (8) and the steel sleeve (7);
step three, drilling a hole near the position of the bolt (8) by using a percussion drill, and mounting a drill support (9);
fourthly, temporarily fixing a drilling machine bracket (9) on the lower part of the floor slab (6), and installing a water drilling machine (10); then adjusting an extension sleeve (11) to go deep between the bolt (8) with the grouting material removed and the steel sleeve (7), ensuring that the central line of the extension sleeve (11) and the central line of the bolt (8) are kept on the same line, completely fixing a drill support (9) and ensuring that a water drilling machine (10) does not displace in the drilling process;
and step five, switching on the water drilling machine (10) and starting the equipment.
2. The nuclear power plant PTR refueling water tank anchor bolt dismantling method as claimed in claim 1, wherein the method comprises the following steps: and in the second step, the percussion drill chisels grouting slurry from the lower part of the floor slab (6) to the steel sleeve (7) along the periphery of the bolt (8) with the depth of 20-25 cm.
3. The nuclear power plant PTR refueling water tank anchor bolt dismantling method as claimed in claim 1, wherein the method comprises the following steps: in the second step, the drilling of the bolt or the damage to the steel sleeve (7) in the drilling process is avoided.
4. The nuclear power plant PTR refueling water tank anchor bolt dismantling method as claimed in claim 1, wherein the method comprises the following steps: in the third step, the drill support (9) is DD-HD 30.
5. The nuclear power plant PTR refueling water tank anchor bolt dismantling method as claimed in claim 1, wherein the method comprises the following steps: and in the third step, a hole with the diameter of 16mm is drilled near the position of the bolt (8) by adopting a percussion drill.
6. The nuclear power plant PTR refueling water tank anchor bolt dismantling method as claimed in claim 1, wherein the method comprises the following steps: and fifthly, controlling the drilling speed in the drilling process, simultaneously hearing the sound and the hand feeling of the hydraulic drill rocker (12) in the drilling process, if the sound is abnormal suddenly or the hydraulic drill rocker (12) is heavy suddenly, stopping the drilling operation immediately and withdrawing the drill bit, and checking whether the drill bit deviates or touches the steel sleeve (7) or the bolt (8).
7. The nuclear power plant PTR refueling water tank anchor bolt dismantling method as claimed in claim 1, wherein the method comprises the following steps: in the fifth step, if the length of the extension sleeve (11) is insufficient in the drilling process, a new section of the extension sleeve (11) is added.
8. The nuclear power plant PTR refueling water tank anchor bolt dismantling method as claimed in claim 7, wherein the method comprises the following steps: in the fifth step, when one section of the extension sleeve (11) is added, rechecking is carried out, and if eccentricity exists, timely adjustment is carried out.
9. The nuclear power plant PTR refueling water tank anchor bolt dismantling method as claimed in claim 8, wherein: in the fifth step, when the drill reaches the depth of 1.5 meters, the drilling speed needs to be reduced, and the drill stops and exits from the extension sleeve (11) immediately after the drill reaches the depth of 1.61 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911100196.0A CN110936326B (en) | 2019-11-12 | 2019-11-12 | Method for dismantling foundation bolts of PTR (Power plant) refueling water tank of nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911100196.0A CN110936326B (en) | 2019-11-12 | 2019-11-12 | Method for dismantling foundation bolts of PTR (Power plant) refueling water tank of nuclear power plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110936326A CN110936326A (en) | 2020-03-31 |
| CN110936326B true CN110936326B (en) | 2021-08-17 |
Family
ID=69907671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911100196.0A Active CN110936326B (en) | 2019-11-12 | 2019-11-12 | Method for dismantling foundation bolts of PTR (Power plant) refueling water tank of nuclear power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110936326B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3270469A (en) * | 1963-01-28 | 1966-09-06 | Ct Ex De Rech S Et D Etudes Du | Expansible, removable ground anchoring device |
| CN1118044A (en) * | 1993-11-04 | 1996-03-06 | 株式会社N.A.B. | Anchor assembly and anchoring method for fixing the anchor assembly |
| DE29604107U1 (en) * | 1996-03-06 | 1997-07-03 | Halfen Gmbh & Co Kg | Device for removing a filling from an anchor rail |
| CN1280899A (en) * | 1999-07-14 | 2001-01-24 | 希尔蒂股份公司 | Disassembling device for pin with tightly adhered shape |
| JP2004232312A (en) * | 2003-01-30 | 2004-08-19 | Chem Grouting Co Ltd | Removal method for tension support material for anchor |
| CN101906782A (en) * | 2010-08-20 | 2010-12-08 | 赵正义 | Positioning and anchoring structure of foundation bolt in concrete foundation |
| CN203222894U (en) * | 2013-03-18 | 2013-10-02 | 山东宁建建设集团有限公司 | Barrier-free dismantling device for embedded bolt |
| CN103727362A (en) * | 2012-10-10 | 2014-04-16 | 尚幔幔 | Construction technology used for quickly replacing high-strength placing anchor bolts in concrete |
| CN204385905U (en) * | 2015-01-04 | 2015-06-10 | 长沙有色冶金设计研究院有限公司 | For the replaceable bolt embedment device of large equipment base |
| CN107339556A (en) * | 2017-08-11 | 2017-11-10 | 中冶华天工程技术有限公司 | A kind of dismountable foundation bolt box device |
| CN108603493A (en) * | 2016-02-05 | 2018-09-28 | 维斯塔斯风力系统有限公司 | The method for replacing the anchor bolt in wind turbine foundation |
| CN108643193A (en) * | 2018-05-16 | 2018-10-12 | 深圳市工勘岩土集团有限公司 | A kind of pattern foundation pit supporting structure prestress anchorage cable Drilling draw out method |
-
2019
- 2019-11-12 CN CN201911100196.0A patent/CN110936326B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3270469A (en) * | 1963-01-28 | 1966-09-06 | Ct Ex De Rech S Et D Etudes Du | Expansible, removable ground anchoring device |
| CN1118044A (en) * | 1993-11-04 | 1996-03-06 | 株式会社N.A.B. | Anchor assembly and anchoring method for fixing the anchor assembly |
| DE29604107U1 (en) * | 1996-03-06 | 1997-07-03 | Halfen Gmbh & Co Kg | Device for removing a filling from an anchor rail |
| CN1280899A (en) * | 1999-07-14 | 2001-01-24 | 希尔蒂股份公司 | Disassembling device for pin with tightly adhered shape |
| JP2004232312A (en) * | 2003-01-30 | 2004-08-19 | Chem Grouting Co Ltd | Removal method for tension support material for anchor |
| CN101906782A (en) * | 2010-08-20 | 2010-12-08 | 赵正义 | Positioning and anchoring structure of foundation bolt in concrete foundation |
| CN103727362A (en) * | 2012-10-10 | 2014-04-16 | 尚幔幔 | Construction technology used for quickly replacing high-strength placing anchor bolts in concrete |
| CN203222894U (en) * | 2013-03-18 | 2013-10-02 | 山东宁建建设集团有限公司 | Barrier-free dismantling device for embedded bolt |
| CN204385905U (en) * | 2015-01-04 | 2015-06-10 | 长沙有色冶金设计研究院有限公司 | For the replaceable bolt embedment device of large equipment base |
| CN108603493A (en) * | 2016-02-05 | 2018-09-28 | 维斯塔斯风力系统有限公司 | The method for replacing the anchor bolt in wind turbine foundation |
| CN107339556A (en) * | 2017-08-11 | 2017-11-10 | 中冶华天工程技术有限公司 | A kind of dismountable foundation bolt box device |
| CN108643193A (en) * | 2018-05-16 | 2018-10-12 | 深圳市工勘岩土集团有限公司 | A kind of pattern foundation pit supporting structure prestress anchorage cable Drilling draw out method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110936326A (en) | 2020-03-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109487822B (en) | Method for installing and adjusting steel pipe column in reverse construction and control device | |
| CN107653884B (en) | Steel casing setting device for drilling of sand foundation cast-in-place pile and construction method thereof | |
| CN108978644B (en) | Energy-saving and environment-friendly construction method for cast-in-situ bored pile | |
| CN203547753U (en) | Profile steel concrete shaft wall base | |
| CN111206575A (en) | Construction method of long spiral pressure-grouting pile | |
| CN108411803B (en) | Integral bridge pier pushing method | |
| CN110936326B (en) | Method for dismantling foundation bolts of PTR (Power plant) refueling water tank of nuclear power plant | |
| CN111719582A (en) | LNG storage tank shock insulation pad stud preformed hole structure, storage tank and preformed method | |
| CN116479888B (en) | Deep water inclined uneven bare rock area steel casing positioning device and pile foundation pore-forming method | |
| CN113174934A (en) | Device and method for controlling concrete over-filling height of bored cast-in-place pile | |
| CN202519631U (en) | Emptying gate | |
| CN218816257U (en) | Pile foundation rotary digging construction hole cleaning drill bit | |
| CN111364479A (en) | Inclined support threaded pile supporting structure for foundation pit enclosure and construction method thereof | |
| CN215857758U (en) | Bored pile foundation pit reinforcing structure | |
| CN204040904U (en) | A kind of device of hole-drilling interlocking pile drill control boring hole deviation | |
| CN212452659U (en) | A diagonal bracing screw thread pile supporting construction for foundation ditch enclosure | |
| CN112360468B (en) | Excavation supporting method for vertical shaft slag sliding well | |
| CN211547694U (en) | Bored concrete pile steel reinforcement cage location centering device | |
| CN114278227A (en) | Construction method of lower pile casing of cast-in-place pile | |
| CN111576477B (en) | Fixing and pouring method for stator foundation plate of hydraulic generator | |
| CN113309108A (en) | Isolation pile with servo grouting function and construction method thereof | |
| CN205400585U (en) | Ground bored pile subassembly | |
| CN217156092U (en) | Anchor rod anchoring force testing device | |
| CN205857237U (en) | A kind of rock anchor base structure being applicable to mountain region photovoltaic module | |
| CN212109881U (en) | Eccentric detection instrument of manual hole digging pile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |