CN112360182A

CN112360182A - Bottom changing construction method for oil tank in cave depot

Info

Publication number: CN112360182A
Application number: CN202011393167.0A
Authority: CN
Inventors: 郭华新
Original assignee: Hebei Mcc20 Group Co ltd; China MCC20 Group Corp Ltd
Current assignee: Hebei Mcc20 Group Co ltd; China MCC20 Group Corp Ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-02-12

Abstract

The invention relates to a cave depot oil tank bottom changing construction method which comprises the steps of ventilating and cleaning an oil tank, forming a temporary feed inlet, installing a transportation platform in a temporary channel, jacking the oil tank, cutting the bottom of the oil tank, changing an asphalt sand cushion, transporting a new sand cushion material, transporting asphalt sand, carrying out tank bottom centering operation, typesetting and processing the bottom outside a cave depot, transporting a middle plate, a side plate and a cambered plate into the oil tank by using the transportation platform, welding the middle plate, the side plate and the cambered plate into a whole to form a new tank bottom, and welding the new tank bottom and the side wall of the oil tank together to finish bottom changing construction of the oil tank. The invention improves the conveying efficiency, ensures the temperature requirement of asphalt sand cushion layer construction, enables the bottom plate to be larger, greatly reduces the length of the welding line of the bottom plate, improves the construction efficiency and reduces the deformation during welding.

Description

Bottom changing construction method for oil tank in cave depot

Technical Field

The invention relates to a tank bottom changing technology, in particular to a cave depot oil tank bottom changing construction method.

Background

In traditional cave depot oil tank construction of changing bottoms, because cave depot oil tank is located the big mountain depths mostly, the traffic is inconvenient, and the oil tank is located the tank room of cave depot, and is equipped with the tunnel on the massif and leads to the tank room, and gets into the tank room and need pass through the explosion-proof sealed door of multichannel, and the general width in tunnel only is 2m, and height 2.5m and tunnel ground oil pipeline, inspection shaft, explosion-proof sealed door are more, and equipment and material can only reach the scene through artifical transport.

Need cut apart panel and carry to the tank room in, when trading the end and typesetting moreover, because mountain body passageway space is narrow, can only process the steel sheet into the steel sheet of less specification outside the cave storehouse, then the manual work is lifted and is transported the steel sheet and to tank room assembly welding, causes conveying efficiency slow, and the welding volume is great, further causes the deformation difficult control. The space in the cave storehouse is narrow, and light is dim, and jar body alignment is difficult. Meanwhile, because the welding quantity is large and the welding time is long, more smoke is generated, and the potential safety hazard is large. The traditional cave depot oil tank construction has the problems of difficult material transportation, many potential safety hazards, large construction difficulty and low working efficiency.

Disclosure of Invention

The invention aims to provide a cave depot oil tank bottom-changing construction method, which solves the problems of difficult material transportation, multiple potential safety hazards, high construction difficulty and low working efficiency in the traditional cave depot oil tank construction method.

The invention is realized by the following steps: a cave depot oil tank bottom-changing construction method comprises the following steps:

a. ventilating and cleaning the oil tank, emptying residual materials in the oil tank, then removing bottom oil sewage in the tank, and ensuring that the oil gas concentration in the cave depot and the oil tank is below 4% of the lower explosion limit by adopting a mechanical and natural ventilation or forced air exhaust mode.

b. And a temporary feed port is formed, and a temporary channel for constructing the tank bottom is removed from the tank chamber inlet explosion-proof wall.

c. The transportation platform is installed in the temporary passage and comprises a base plate, a rail is arranged on the base plate, a sliding table is installed on the base plate, a plurality of rollers are installed on the lower surface of the sliding table, and the rollers are located in the rail.

d. And (3) jacking the oil tank, mounting a reinforcing ring on the inner wall of the oil tank, mounting jacking brackets on the wall of the pipe, and jacking the oil tank by using a jack.

e. And cutting the bottom of the oil tank into small pieces and conveying the small pieces to the outside of the cave depot by using a conveying platform.

f. And replacing the asphalt sand cushion, breaking the asphalt sand cushion at the bottom of the original tank, and conveying the asphalt sand blocks to the outside of the cave depot for centralized treatment through the conveying platform.

g. And conveying new sand cushion materials into the oil tank through the conveying platform, and leveling and tamping after laying the new sand cushion.

h. Mixing the bituminous sand outside the cave depot, conveying the bituminous sand by using a conveying platform in a temporary passage, carrying out heat preservation measures on the bituminous sand in the conveying process, uniformly spreading the bituminous sand on a sand cushion layer in a layering manner, and flattening and compacting.

i. Carry out tank bottoms centering operation, carry out the unwrapping wire on pitch sand bedding surface, evenly arrange a plurality of pairs of stands in tank bottoms circumferencial direction, be connected with balanced rope between each pair of stand, be connected with chain block between stand and oil tank lateral wall, be provided with in the atress opposite direction of stand and draw to one side and support.

j. The oil tank is adjusted by each chain block to be aligned with the paying-off position, and the oil tank is slowly put down after being aligned.

k. The processing of typesetting is carried out to the tank bottoms outside the hole storehouse, includes intermediate lamella, curb plate and bow-shaped board at the bottom of the new tank, and wherein the intermediate lamella is rectangular plate, and the both sides that a plurality of width are unanimous are located the intermediate lamella and constitute equilateral hexagon with the intermediate lamella, and the bow-shaped board is located equilateral hexagon's periphery and constitutes a circular, and BIM laying-out unloading is taken to the quantity and the size of intermediate lamella, curb plate and bow-shaped board.

And l, conveying the middle plate, the side plates and the arched plate into the oil tank by using the conveying platform, welding the middle plate, the side plates and the arched plate into a whole to form a new tank bottom, and welding the new tank bottom and the side wall of the oil tank together to finish bottom changing construction of the oil tank.

In step a, a manhole on the top of the tank is required to be opened, ventilation is performed through the manhole on the top of the tank, and oil-sewage water on the bottom of the tank is output.

When cutting or welding, firstly cleaning oil stains and surrounding combustible gas at the position, to be cut or welded, of the tank body, carrying out oil gas test after cleaning, cutting or welding after the test is qualified, keeping a good ventilation state in the whole cutting or welding construction process, and continuously detecting the oil gas condition in the tank.

The mixed asphalt sand is uniformly layered on a sand cushion layer at the temperature of not less than 140 ℃, the virtual laying coefficient is 1.3, the mixed asphalt sand is compacted by a flat vibrator and is spread by a hot iron or is compacted by rolling by a preheated iron roller, the temperature of the compacted asphalt sand is not less than 60 ℃, and a hot asphalt is coated at the joint of the upper asphalt sand layer and the lower asphalt sand layer so as to be beneficial to the combination of the two asphalt sand layers.

In step k, the middle plate, the side plates and the arched plates are cut from steel plates with the same width.

In order to facilitate construction, the explosion-proof wall at the inlet of the tank room is dismantled, so that the original channel of the cave depot is communicated with the bottom of the tank to form a temporary channel, and a transportation platform is arranged in the temporary channel and can facilitate rapid transportation of materials. Especially, the mixed asphalt sand can only be mixed outside the cave depot, and the distance from the outside of the cave depot to the oil tank is far, the high-temperature asphalt sand is easy to cool, and the asphalt sand can be quickly conveyed to the oil tank through the transportation platform, so that the temperature of the asphalt sand meets the requirement. And can carry heavier bigger steel sheet for traditional artifical transportation through the transportation platform, so can be big enough that the size of intermediate lamella, curb plate and bow-shaped plate design under the prerequisite of guaranteeing to pass through temporary passage with the size of intermediate lamella, curb plate and bow-shaped plate when the bottom plate is typeset, the quantity of intermediate lamella, curb plate and bow-shaped plate will become fewly like this, improves conveying efficiency, can reduce the length of bottom plate welding seam greatly simultaneously, improves the efficiency of construction, less deformation.

Drawings

Fig. 1 is a schematic diagram of the tank floor layout of the present invention.

Fig. 2 is a block diagram of the transport platform of the present invention.

Fig. 3 is a schematic view of the alignment of the tank of the present invention.

Fig. 4 is a top view of fig. 3.

In the figure: 1. an arcuate plate; 2. a middle plate; 3. a side plate; 4. a side wall; 5. a column; 6. a balancing rope; 7. carrying out diagonal bracing; 8. a chain block; 9. a base plate; 10. a track; 11. a sliding table; 12. and a roller.

Detailed Description

The invention comprises the following steps:

c. The temporary passage is internally provided with a transportation platform, the transportation platform comprises a base plate 9, a track 10 is arranged on the base plate 9, a sliding table 11 is arranged on the base plate 9, a plurality of rollers 12 are arranged on the lower surface of the sliding table 11, and the rollers 12 are positioned in the track 10.

i. Carrying out tank bottom centering operation, paying off the surface of the asphalt sand cushion layer, uniformly arranging a plurality of pairs of upright columns 5 in the circumferential direction of the tank bottom, connecting a balance rope 6 between each pair of upright columns 5, connecting a chain block 8 between the upright columns 5 and the side wall 4 of the oil tank, and arranging a diagonal bracing 7 in the stress opposite direction of the upright columns 5.

j. The oil tank is adjusted by each chain block 8 to be aligned with the paying-off position, and the oil tank is slowly put down after being aligned.

k. The processing of typesetting is carried out to the tank bottoms outside the hole storehouse, includes intermediate lamella 2, curb plate 3 and bow-shaped plate 1 at the bottom of the new tank, and wherein intermediate lamella 2 is rectangular plate, and the curb plate 3 that a plurality of widths are unanimous is located intermediate lamella 2's both sides and constitutes equilateral hexagon with intermediate lamella 2, and bow-shaped plate 1 is located equilateral hexagon's periphery and constitutes a circular, and BIM typesetting unloading is taken to intermediate lamella 2, curb plate 3 and bow-shaped plate 1's quantity and size.

And l, conveying the middle plate 2, the side plate 3 and the arc-shaped plate 1 into the oil tank by using the transportation platform, welding the middle plate 2, the side plate 3 and the arc-shaped plate 1 into a whole to form a new tank bottom, and welding the new tank bottom and the side wall 4 of the oil tank together to complete bottom changing construction of the oil tank.

When the bottom of the oil tank is changed, the oil in the oil tank needs to be emptied, the oil tank is cleaned, all the oil in the oil tank of the oil depot is thoroughly emptied, the oily water in the oil tank is removed, and then the oil gas concentration in the cave depot and the oil tank is ensured to be below 4% of the lower explosion limit by adopting a mechanical and natural ventilation or forced air exhaust mode. And disconnecting all oil pipelines and anti-static systems connected with the oil tank to be repaired and reconstructed. And plugging the two surfaces of the steel-made grounding plate by using a steel blind plate, making temporary anti-static wire connection, and independently laying a safe grounding wire. The oil in the pipeline is emptied by a mode of inverted drainage or back pumping, and a section of pipeline entering the transformed oil tank is temporarily dismantled and plugged by a blind plate for the pipeline which cannot be emptied, so that the pipeline is ensured to be connected and isolated with other pipelines and a storage tank system.

And (3) detaching the manhole, the unthreaded hole and the metering oil hole of the tank body of the oil tank by adopting a copper anti-explosion tool when wearing the anti-static work clothes and the work shoes, detaching the breather valve and a pipeline connected with the tank body, and preventing static grounding and the like. The manhole of the tank top is opened, the manhole of the tank top is connected with the suction inlet of the negative pressure fan by adopting the anti-static flexible connection air pipe, the manhole of the tank body must be opened every day at night and closed in the morning, other work cannot be influenced, and the ventilation time of each oil tank is not less than 6 days. And after 24 hours of negative pressure ventilation, carrying out intermittent ventilation, namely, carrying out ventilation for 4 hours at intervals of 1 hour every time, condensing oil gas and then ventilating for 4 hours, repeating the steps, and detecting the concentration of the oil gas after continuous 24 hours. When the concentration of oil gas reaches below 40% of the lower explosion limit, the oil gas enters the tank to clean oil sludge and sludge by wearing the anti-static clothes and the gas mask, and the thickness of the oil sludge is 20 cm. The person who enters the jar must have the special person to monitor and record the time of entering the jar, the operation time is not more than 30 minutes, the interval time is not less than 1 hour, and a plurality of people ensure the safety in turn. After the tank bottom oil sludge is cleaned, the man-made tool barrel is conveyed to a man-hole position and is conveyed out of the tank.

In order to facilitate the material and equipment to enter and exit, the explosion-proof wall at the tank chamber inlet is dismantled to form a temporary channel specially used for tank bottom replacement construction.

After the temporary passage is opened, a transportation platform is installed in the temporary passage, as shown in fig. 2, a base plate 9 is laid along the temporary passage, a sliding table 11 is placed on the base plate 9, and equipment and materials for construction are transported through the transportation platform.

And then lifting the oil tank, installing a reinforcing ring on the inner wall of the oil tank before lifting to prevent the tank body from deforming when the tank bottom plate is cut, installing a circle of jacking brackets on the outer wall of the oil tank, then using a hydraulic jack to perform jacking operation, and after jacking is completed, adding a rigid support on the outer side of the jack to ensure the stability of the oil tank.

After the oil tank is lifted, the bottom plate of the oil tank is dismantled, the leakage condition of the bottom of the oil tank is checked, high-pressure gas is used for stretching to the outer bottom side to blow and blow so as to prevent leakage residual oil from forming oil vapor and to avoid potential safety hazards, continuous ventilation and detection of oil gas concentration are carried out in the tank, a fire test is organized after the fire condition is achieved, and cutting construction is carried out after the fire condition is achieved. And conveying the cut old bottom plate out of the cave depot through a conveying platform.

Before changing new tank bottoms, need change original pitch sand bed course, with the artifical abolishment of the pitch sand bed course of original tank bottoms 100mm thick, pitch sand piece people frock small handcart transports to manhole department, then carries to the centralized processing outside the hole storehouse through the transportation platform to the centering sand bed course is cleared up.

Laying a new medium sand cushion layer, transporting the sand into the tank chamber by the transportation platform, and leveling and tamping after laying. And then laying a new asphalt sand cushion layer, wherein the asphalt sand needs to be mixed outside the cavern because the inner space of the cavern is narrow and the condition of mixing the asphalt sand is not provided, then the asphalt sand is arranged in a trolley and is conveyed into a tank room through a conveying platform, and the mixed high-temperature asphalt sand can be quickly conveyed to a construction site because the conveying platform is arranged, so that the mixed asphalt sand is uniformly layered and paved on the sand cushion layer at the temperature of not less than 140 ℃, the virtual paving coefficient is 1.3, the asphalt sand is compacted by a flat vibrator and spread by a hot iron or is compacted by a preheated iron roller in a rolling way, the temperature of the compacted asphalt sand is not less than 60 ℃, and a hot asphalt is coated at the joint of the upper and lower asphalt sand layers so as to be beneficial to the combination of the two asphalt sand layers.

As shown in fig. 3 and 4, after the asphalt sand cushion is qualified, paying off and pre-typesetting are carried out on the surface, a plurality of pairs of upright columns 5 are uniformly arranged in the circumferential direction of the paying off position at the bottom of the tank, a balance rope 6 is connected between each pair of upright columns 5, a chain block 8 is connected between the upright columns 5 and the side wall 4 of the oil tank, and a diagonal bracing support 7 is arranged in the stress reverse direction of the upright columns 5. Before the oil tank below, the oil tank is adjusted by each chain block 8 to be aligned with the paying-off position, and after the alignment, the oil tank is slowly put down. The vertical columns 5 and the arrangement are generally carried out after the welding of the arched plates 1 of the base plate is completed.

As shown in fig. 1, the processing of typesetting is carried out to the tank bottoms outside the cave storehouse, the new tank bottoms is formed by intermediate lamella 2, curb plate 3 and the concatenation of bow-shaped board 1, wherein intermediate lamella 2 is rectangular plate, the curb plate 3 that a plurality of widths are unanimous is located intermediate lamella 2's both sides and constitutes equilateral hexagon with intermediate lamella 2, bow-shaped board 1 is located equilateral hexagon's periphery and constitutes a circular, intermediate lamella 2, BIM typesetting unloading is taken to the quantity and the size of curb plate 3 and bow-shaped board 1, intermediate lamella 2, curb plate 3 and bow-shaped board 1 all have the steel sheet cutting of the same width to form. According to the invention, the transport platform is arranged in the temporary channel, so that the plates are not transported manually any more, the transport capacity can be greatly improved, the size of the plates can be increased as much as possible, the optimal size result can be obtained through BIM typesetting, the number of the plates can be greatly reduced, and the length of a welding line is greatly reduced after splicing.

And (3) conveying the middle plate 2, the side plates 3 and the arched plate 1 into the tank chamber, and then performing welding construction to obtain a new oil tank bottom.

In order to facilitate construction, the explosion-proof wall at the inlet of the tank room is dismantled, so that the original channel of the cave depot is communicated with the bottom of the tank to form a temporary channel, and a transportation platform is arranged in the temporary channel and can facilitate rapid transportation of materials. Especially, the mixed asphalt sand can only be mixed outside the cave depot, and the distance from the outside of the cave depot to the oil tank is far, the high-temperature asphalt sand is easy to cool, and the asphalt sand can be quickly conveyed to the oil tank through the transportation platform, so that the temperature of the asphalt sand meets the requirement. And can carry heavier bigger steel sheet for traditional artifical transportation through the transportation platform, so can be with intermediate lamella 2 when the bottom plate is typeset, the size of curb plate 3 and bow-shaped plate 1 is enough big guaranteeing to design under the prerequisite that can pass through temporary passage, intermediate lamella 2 like this, curb plate 3 and bow-shaped plate 1's quantity will become less, improve conveying efficiency, the length of bottom plate welding seam can be reduced greatly simultaneously, improve the efficiency of construction, less deformation. And the centering device is arranged, so that the position of the tank body is ensured, the construction accuracy is ensured, and a qualified oil tank is obtained.

Claims

1. A cave depot oil tank bottom-changing construction method is characterized by comprising the following steps:

a. ventilating and cleaning the oil tank, emptying residual materials in the oil tank, then removing bottom oil sewage in the tank, and ensuring that the oil gas concentration in the cave depot and the oil tank is below 4% of the lower explosion limit by adopting a mechanical and natural ventilation or forced air exhaust mode;

b. a temporary feed port is formed, and a temporary channel for constructing the tank bottom by opening the tank chamber inlet explosion-proof wall is removed;

c. a transport platform is arranged in the temporary channel and comprises a base plate, a track is arranged on the base plate, a sliding table is arranged on the base plate, a plurality of rollers are arranged on the lower surface of the sliding table, and the rollers are positioned in the track;

d. jacking the oil tank, installing a reinforcing ring on the inner wall of the oil tank, installing jacking brackets on the wall of the pipe, and jacking the oil tank by using a jack;

e. cutting the bottom of the oil tank, cutting the oil tank into small pieces and conveying the small pieces to the outside of a cave depot by using a conveying platform;

f. replacing the asphalt sand cushion, breaking the asphalt sand cushion at the bottom of the original tank, and conveying the asphalt sand blocks to a cave depot for centralized treatment through a conveying platform;

g. conveying a new sand cushion material into the oil tank through the transportation platform, and leveling and tamping after laying the new sand cushion;

h. mixing the asphalt sand outside the cave depot, conveying the asphalt sand in a temporary passage by using a conveying platform, performing heat preservation measures on the asphalt sand in the conveying process, uniformly spreading the asphalt sand on a sand cushion layer in a layering manner, and flattening and compacting;

i. performing tank bottom centering operation, paying off the surface of the asphalt sand cushion layer, uniformly arranging a plurality of pairs of stand columns in the circumferential direction of the tank bottom, connecting a balance rope between each pair of stand columns, connecting a chain block between the stand columns and the side wall of the oil tank, and arranging a diagonal bracing support in the opposite direction of the stress of the stand columns;

j. the oil tank is adjusted by each chain block to be aligned with the paying-off position, and the oil tank is slowly put down after being aligned;

k. the method comprises the following steps of composing and processing the tank bottom outside a cave depot, wherein the new tank bottom comprises a middle plate, side plates and a cambered plate, the middle plate is a long-strip rectangular plate, the side plates with the same width are positioned on two sides of the middle plate and form an equilateral hexagon with the middle plate, the cambered plate is positioned on the periphery of the equilateral hexagon to form a circle, and BIM composing blanking is adopted for the quantity and the size of the middle plate, the side plates and the cambered plate;

2. The cave depot oil tank bottom-changing construction method according to claim 1, wherein in the step a, a manhole of a tank top is required to be opened, ventilation is performed through the manhole of the tank top, and oil sewage at the bottom of the tank is output.

3. The cave depot oil tank bottom-changing construction method according to claim 1, characterized in that when cutting or welding is carried out, firstly oil stains and surrounding combustible gas at the position where the tank body is cut or welded are cleaned, oil gas test is carried out after the oil stains and the surrounding combustible gas are cleaned, cutting or welding is carried out after the oil gas test is qualified, good ventilation state is kept in the whole process of cutting or welding construction, and oil gas condition in the tank is detected uninterruptedly.

4. The cave depot oil tank bottom-changing construction method according to claim 1, characterized in that in step h, the mixed tar sands are layered and evenly spread on a sand cushion layer at a temperature of not less than 140 ℃, the virtual spreading coefficient is 1.3, the mixed tar sands are compacted by a flat vibrator and spread by a hot iron or are compacted by rolling by a preheated iron roller, the temperature of the compacted tar sands is not less than 60 ℃, and the joint of the tar sands of the upper layer and the lower layer is coated with a hot tar to be beneficial to the combination of the tar sands of the two layers.

5. The bottom-changing construction method for cave depot oil tank as claimed in claim 1, wherein in step k, the middle plate, the side plates and the segmental plates are cut out from steel plates with the same width.