CN114135134A - Intelligent dynamic monitoring gas jacking construction method for vault of low-temperature storage tank - Google Patents
Intelligent dynamic monitoring gas jacking construction method for vault of low-temperature storage tank Download PDFInfo
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Abstract
An intelligent dynamic monitoring gas jacking construction method for a low-temperature storage tank vault comprises the following steps: 1) installing a balance system, a sealing system and a fan system; 2) installing an attitude monitoring system; 3) performing air jacking operation on the vault; 4) and (4) fixing and welding a vault. The method adopts the edge penetrating type vault balancing technology to ensure symmetrical balance, improves the overall stability of the vault during jacking, and improves the accuracy of jacking the vault. The method adopts a method for monitoring the attitude of the storage tank dome, and provides reliable data support for smooth jacking of the dome. According to the method, the anchoring point of the steel wire rope is balanced to be arranged on the concrete bearing platform, the anchoring point is perpendicular to the T-shaped support, the steel wire rope and the anchoring point are ensured to be in a vertical stress state, and the stress state of the steel wire rope during jacking is optimized.
Description
Technical Field
The technical scheme belongs to the technical field of installation and construction, and particularly relates to an intelligent dynamic monitoring gas jacking construction method for a low-temperature storage tank vault. The method is suitable for the gas jacking construction of the vault of the low-temperature storage tank, in particular to the gas jacking construction of the vault of a large-scale low-temperature storage tank.
Background
The large-scale low-temperature storage tank generally adopts a full-capacity tank with relatively high safety, an inner tank is made of Ni 9% steel, and an outer tank is in a prestressed concrete structure. The gas jacking process is the link with the greatest difficulty, the most complex process and the highest risk in the construction process.
22 km of a liquefied natural gas project3The low-temperature storage tank is the domestic low-temperature storage tank with the largest monomer capacity, the inner diameter of the outer tank of the storage tank of the project is 88m, the arch crown structure span is 87.86m, the height is 13.782m, the air-lift top-lifting height is about 42.806m, the arch crown lifting height is 59.594m, and the weight of the arch crown is about 930 tons, so that the domestic maximum and heaviest arch crown top-lifting operation is realized at present.
At present, the balance of the gas jacking vault of the large-scale low-temperature storage tank mainly has two modes: edge-penetrating dome balance systems and center-intensive balance systems.
Disclosure of Invention
In order to ensure the smooth jacking of the large vault, the invention provides the construction method by combining the construction experience of a plurality of large low-temperature storage tanks.
An intelligent dynamic monitoring gas jacking construction method for a low-temperature storage tank vault comprises the following steps: 1) installing a balance system, a sealing system and a fan system; 2) installing an attitude monitoring system; 3) performing air jacking operation on the vault; 4) fixedly welding the arch top;
in the step 1), a balance system is used for keeping the balance of the vault in the process of lifting the vault by using the gas cap; the sealing system is formed by paving a sealing layer at the contact position of the edge of the vault and the inner wall of the outer tank body, so that the air leakage amount is reduced as much as possible in the jacking and blowing process; the blower system blows air to the tank body to obtain air pressure for air jacking in the process of air jacking of the vault;
in the balance system, the balance system comprises a T-shaped support, a guide pulley and a steel wire rope, wherein the guide pulley is arranged on the T-shaped support and used for pulling the steel wire rope at the vault, and the steel wire rope is connected with the guide pulley in a matching way; the balancing system has a plurality of groups which are uniformly arranged around the axis of the storage tank;
for a group of balance systems, the tail end of a steel wire rope is fixed on the outer wall of a storage tank, the head end of the steel wire rope penetrates through a vault from top to bottom through a guide pulley, then a first pulley connected with the bottom surface of the vault is turned to be radial, and after the steel wire rope penetrates through the axis of the storage tank, a second pulley connected with the bottom surface of the vault is turned to be axial, and finally the steel wire rope extends downwards and is connected with a bearing platform in the storage tank; the first and second pulleys are symmetrical about the axis of the tank;
in the step 2), the balance of the vault is monitored by using an attitude monitoring system, and the method comprises the following steps: a plurality of distance meters are uniformly arranged on the pressure-bearing ring for detecting the lifting speed of each position of the vault; installing a gyroscope on the vault to detect the horizontal posture of the vault; setting a barometer for detecting the pressure in the tank; data acquired by the devices are sent to a background computer system, and construction is adjusted in real time according to all detection data;
the step 3) comprises the following steps:
3.1) checking before jacking and pre-jacking:
firstly, detecting a fan system;
then starting part of fans of the fan system, and jacking the vault to the height of the part; checking whether the edge support of the vault longitudinal beam and the vault is completely separated or not and whether the performance of a sealing system is normal or not; repairing the detected problems;
3.2) formal jacking
Starting all fans except the standby fan of the fan system, and gradually increasing the air quantity by adjusting the opening degree of the air door to enable the pressure in the tank to be enough to jack up the vault;
checking the balance state of the vault, and adjusting the balance state of the vault immediately;
when the distance between the vault and the preset height is 3m, reducing the inlet flow of the fan, and controlling the vault ascending speed to be 100-200 mm/min;
when the distance between the arch top and the preset height is 2m, checking whether the arch top deviates in the circumferential direction, and adjusting the deviation in time;
after the vault reaches the preset height and is tightly attached to the pressure bearing ring, maintaining jacking air pressure;
and in the step 4), assembling and fixing the vault and the pressure-bearing ring to finish the gas jacking and fixing of the vault.
Further, in the step 1), the step 1.2) of installing the sealing system includes:
1.2.1) installing a vault edge fixing piece, wherein the vault edge fixing piece is used for fixing a sealing plate;
1.2.2) sealing plate Assembly
1.2.2.1) prefabricating a sealing plate, a reinforcing pressing plate and a pressing strip;
1.2.2.2) connecting the sealing plates to the vault edge piece by piece through the fixing piece of the vault edge;
1.2.2.3) overlapping adjacent sealing plates, reinforcing the overlapped part by using a reinforcing pressing plate, then installing aluminum foil fiber cloth, bonding and sealing the overlapped part of the fiber cloth and the reinforcing pressing plate by using a sealing adhesive tape, then installing a pressing strip, finally penetrating the reinforcing pressing plate through a screw rod welded on a galvanized plate for gasket adding and upper nut fixing, sealing the unsealed part of the lap joint seam of the reinforcing pressing plate by using the adhesive tape, and sealing the lap joint between the fiber cloth by using the adhesive tape;
the total perimeter of the sealing plate of the completed sealing system is 1% longer than the perimeter of the concrete inner wall of the tank wall.
In the step 1), the large and small door openings for storage tank construction are closed before the blower is installed, and the opening of the wall plate of the door opening is connected with the air duct of the blower; 1.3) in the process of installing a fan system, firstly, calculating the wind pressure and the wind quantity of a fan according to the weight of a gas lift; the model and the number of the fans are selected, and one standby fan is selected.
Further comprising the step 5) of data analysis: and (4) after jacking is finished, collecting and analyzing data, and drawing a jacking time and speed curve, a vault inclination amount-time curve and a jacking pressure-time curve.
In the attitude monitoring system, a monitoring management cloud platform is constructed based on a background computer system and is communicated with each terminal device through a network; the monitoring management cloud platform and the terminal equipment form a local area network and a 5G data transmission network by adopting spread spectrum wireless networking.
The real-time monitoring data of the attitude monitoring system comprises:
1) maximum height: measuring point data with the highest jacking height in the height measuring data at the same moment;
2) maximum height difference: in the height measurement data at the same moment, the difference value between the maximum height and the minimum height measured in all the measurement points is obtained;
3) average height: average height of all measurement points at the same time;
4) jacking speed: calculating the instantaneous rising speed of the dome according to the measured data;
5) average air pressure: calculating an average air pressure value according to the measurement reading of the barometer;
6) the elapsed time is as follows: recording the time used from the beginning to monitor the current;
7) the remaining time: calculating the estimated remaining time for completing jacking according to the instantaneous speed and the remaining height of the dome;
real-time monitoring data and raw data of a distance meter, a barometer and a gyroscope are stored in a database of the attitude monitoring system; the technology of monitoring data in real time is completed by an edge technology workstation in the attitude monitoring system;
and monitoring the data in real time, transmitting the data to the terminal equipment and displaying the data.
The method is suitable for the gas jacking construction of the vault of the low-temperature storage tank.
The technical solution of the present invention is further explained below.
1. The core content of the invention comprises:
1) the edge penetrating type balancing method is adopted, the storage tank air jacking is realized in a mode that a plurality of sets (such as 24 sets) of balancing steel wire ropes are penetrated oppositely, namely a plurality of sets (such as 24 sets) of T-shaped frames are arranged on the pressure bearing ring, the plurality of sets (such as 24 sets) of steel wire ropes are placed from the T-shaped frames to penetrate through the dome skin plate to be transversely penetrated to the pulley blocks at the symmetrical positions through the pulley blocks, and a plurality of sets (such as 24 sets) of steel wire ropes are utilized to form a crossing mode at the lower part of the dome, so that the integrity and the constraint of the steel wire ropes are improved, the balance of the dome is enhanced in the jacking process, and the operation fault tolerance is improved. The method can effectively control the circumferential and horizontal displacement of the vault in the ascending process, ensure that each index is within the standard requirement, and stably and smoothly finish the air jacking work.
2) And optimizing the stress state of the steel wire rope during jacking. According to the method, the steel wire rope is in a diagonal pulling state, and the stress state of the steel wire rope is not good, the steel wire rope stress calculation is performed in advance, the anchoring piece is arranged on the concrete bearing platform in the concrete bearing platform pouring stage, the anchor point position is perpendicular to the T-shaped support, the steel wire rope and the anchor point are ensured to be in a vertical stress state, and the stress state of the steel wire rope in the jacking period is optimized.
3) The vault jacking monitoring adopts multiple kinds of most of check out test set to detect the storage tank dome gesture to carry out the real-time adjustment of job site according to the monitoring data. Detection equipment and data processing constitute storage tank dome gesture intelligent monitoring system. Utilize a plurality of (as 8) military project level high accuracy infrared distance meters evenly to arrange on the bearing ring, install the gyroscope in tank deck middle part position, utilize the digital integration platform with the high-efficient accurate monitoring vault balanced state of refresh frequency (30 seconds/time) during the jacking of vault, traditional manual measurement cost has been reduced, measurement accuracy has been improved, for provide more accurate data support after jacking process and the jacking, promote the jacking accuracy, the jacking skew is steerable at 2-3cm, the installation accuracy is high, provide reliable data support for the smooth jacking of vault. Not only provides digital support for gas jacking operation, but also provides technical support for subsequent data analysis, and ensures that construction safety and quality are always in a high-standard controlled state.
2. Features of the invention
2.1 adopt edge to run through type vault balanced technique, wear 24 groups wire rope, utilize T type support and assembly pulley to carry out the opposite direction with wire rope fixed, guarantee symmetrical balance, improved the overall stability of vault when the jacking, promoted the accuracy nature of vault jacking.
2.2 adopt the independently researched and developed intelligent monitoring system of storage tank dome posture, utilize 8 military project level high accuracy infrared distance measuring instruments evenly to arrange on the pressure-bearing ring, install the gyroscope in tank deck middle part position, utilize the high-efficient accurate monitoring vault equilibrium state of refresh frequency with 30 seconds/times during vault jacking of digital integration platform, provide reliable data support for the smooth jacking of vault.
2.3 the method balances the anchoring point of the steel wire rope to be arranged on the concrete bearing platform, the anchoring point is perpendicular to the T-shaped support, the steel wire rope and the anchoring point are ensured to be in a vertical stress state, and the stress state of the steel wire rope during jacking is optimized.
3. Application scope of the invention
The method is suitable for the gas jacking construction of the vault of the large-scale low-temperature storage tank.
4. The process principle of the invention
The air-lift jacking work mainly comprises the operation of smoothly lifting the vault (steel dome and aluminum suspended ceiling) of the storage tank to the standard height of the installation of the pressure-bearing ring by utilizing a balance system, a sealing system, a power system and the like and relying on buoyancy and lifting force.
Firstly, a sealing system is arranged between the vault and the outer tank concrete tank wall to form a relatively closed space; and then, continuously conveying a certain amount of low-pressure air to the closed space below the vault of the storage tank by using a fan system, jacking the vault to ascend along the tank wall under the regulation of a balancing device after the gas pressure in the closed space is greater than the weight to be jacked and the frictional resistance is overcome, and connecting the vault to a tank top pressure-bearing ring after the vault is jacked in place.
Drawings
FIG. 1 is a process flow diagram;
FIG. 2a is a T-bracket layout (tank top view);
FIG. 2b is a schematic view of a set of balance system installations;
FIG. 2c is a schematic view of a pair of counterbalance system installations;
FIG. 3 is a schematic view of a T-bracket installation;
FIG. 4 is a schematic diagram of the form and installation of a wire rope socket;
FIG. 5 is a schematic diagram of the slope of the roof;
FIG. 6 is a detailed schematic view of a pulley block;
FIG. 7 is a schematic view of an upper embedment;
FIG. 8a is a dome lip fixture;
FIG. 8b is a schematic view of the seal plate overlapping position of the seal plate combination
FIG. 9 is a schematic view of temporary closure of a large doorway;
FIG. 10 is a schematic view of temporary closure of a small door opening;
FIG. 11 is a schematic side view of an access security gateway;
FIG. 12 is a fan layout;
FIG. 13 is a jacking speed profile;
FIG. 14 is a dome slope amount versus time curve;
FIG. 15 is a jacking pressure-time curve.
Detailed Description
The present invention will be further described with reference to the following embodiments.
According to the method, the vault balance adopts the edge penetrating type vault balance system, the balance of the whole tool in the jacking process is improved compared with that of the middle intensive type vault balance system, the stability is higher, the vault displacement is reduced, the repair and rework of other supporting facilities caused by vault deviation are avoided, the whole construction cost is reduced, and the accuracy of vault jacking is improved. The method adopts an independently researched and developed intelligent monitoring system for the attitude of the storage tank dome, utilizes a digital integrated platform to efficiently and accurately monitor the balance state of the dome, and provides reliable data support for the smooth jacking of the dome. Compare traditional manual slide rule and measure, reduced traditional manual measurement cost, improved measurement accuracy, for provide more accurate data support after jacking process and the jacking, promote the jacking accuracy.
This example uses 22 km of a liquefied natural gas project3The vault uplift of the cryogenic tank is exemplified for explanation. The project is a domestic low-temperature storage tank with the largest single body capacity, the inner diameter of the outer tank of the project storage tank is 88m, and the arch crown structure span is 87.86mThe height is 13.782m, the air-lift top lifting height is about 42.806m, the vault lifting elevation is 59.594m, and the weight of the vault is about 930 tons, which is the largest and heaviest vault lifting operation in China at present.
1. The technological process and the operational key points of the invention
1 process flow, as shown in figure 1.
2 points of operation
2.1 Condition confirmation
1) The gas jacking scheme is approved;
2) constructors are familiar with the construction technical scheme, and complete safety technology bottom-crossing work for operation teams and groups and posts;
3) compiling a welding process instruction book according to qualified welding process evaluation;
4) all welders take the certificates for post work and need to be qualified through examination;
5) the inspection of the concrete inner wall is qualified;
6) the concrete strength of the compression-resistant ring lower wall body (13A) reaches 80 percent (40MPa) of the design requirement, and the prestress tension is finished;
7) the construction tools meet the requirements and are qualified in verification.
2.2 Balancing System installation
The balance system mainly comprises a support (T type) arranged on the pressure-bearing ring, a guide pulley and a steel wire rope, and the total number of the balance system is 24.
1) And (3) mounting a T-shaped bracket: as shown in figure 2, the number of the brackets is 24, the brackets are evenly distributed on the upper part of the pressure-bearing ring of the tank top and are welded by steel pipes. When the T-shaped support is installed, the installation position of the support is sequentially marked on the bearing ring by using a total station instrument by taking a 0-degree azimuth angle as a reference, and the initial installation position is consistent with the position of the bottom embedded part. The number of the brackets is 24, the brackets are arranged at intervals of 15 degrees, the installation radius of the brackets is 43.9m (the distance from the horizontal position of the anti-pressure ring to the horizontal position is 10cm), and 4 symmetrical T-shaped frames are required to be provided with tension meters.
In fig. 2a, the number + # of the concrete wall 1 indicates the number of the T-shaped bracket, and the vault 7 is formed in the concrete wall.
In fig. 2b, a T-shaped bracket 2, a steel wire rope 3, a first pulley 4 and a second pulley 5;
in fig. 2c, a T-shaped bracket 2, a steel wire rope 3 and a pulley block 6;
referring to fig. 3, the T-shaped bracket adopts a phi 159 x 8 carbon steel pipeline, the bracket and the pressure-bearing ring are connected in a welding mode, an E7018-1 welding rod is used, and the height of a welding leg is not less than 8 mm. The support is prefabricated by adopting a welding mode, a J427 welding rod is used for welding, and the height of a welding leg is not less than 8 mm. In order to prevent the support from deforming due to unbalanced force, the inclined supports are additionally arranged on the two sides of the support, the reinforcing plates are additionally arranged, and PT detection is required to be carried out on welding lines of all lifting lugs and T-shaped frames, and the welding lines are qualified.
In fig. 3, a T-shaped bracket 2, a pressure-bearing ring 25, a pressure-resisting ring 26 and a guide pulley 27;
2) installing a steel wire rope: before the steel wire rope is installed, a line weight or a laser instrument is adopted to vertically project the installation position of the steel wire rope onto the arch top plate, a mark is made by a marking pen, then a hole is formed, the diameter of the hole is 30mm, in order to reduce friction between the steel wire rope and the arch top plate in the air-lift jacking process and protect the steel wire rope, a sleeve needs to be installed at the position where the steel wire rope is in contact with the arch top plate, the steel wire rope reaches the interior of the tank through the sleeve, and the form and the installation mode of the sleeve are shown in figure 4.
In fig. 4, a concrete wall 1, a steel wire rope 3, a pulley block 6, a vault 7, a rim support 8, a sleeve 9 and a bottom embedded part 10.
After all the supports are installed, after the steel wire ropes are laid at corresponding positions, the steel wire ropes need to be tensioned, the initial tension of the steel wire ropes is adjusted to 9000N, chain blocks are matched during tensioning, a tension meter for checking is used for measuring, one end of the tension meter is connected with the tail end of each bottom steel wire rope through a clamping ring, the other end of the tension meter is connected and fixed to the chain blocks connected with steel wires at the tail ends of pulleys on the arch crown plate, the tension of the steel wire ropes is adjusted by adjusting the length of the chain blocks, and a specially-assigned person is arranged to observe the tension meter.
The steel wire rope needs cross tensioning from top to bottom.
And (3) steel wire rope stress analysis:
when the condition that the inclination of the tank top is 200mm occurs in the jacking process, the stress analysis of the steel wire rope is as follows:
the inclination of the top of the can of 200mm is the maximum height difference of the edge of the top of the can of 200mm, as shown in figure 5 for a simple illustration.
When the inclination of the tank top is 200mm, the steel wire rope is calculated and analyzed according to the maximum elongation of 100mm by considering the actual structural form of the balancing device, the nominal diameter phi is 20mm, the model is 6 multiplied by 37 plus FC-1670, and the nominal tensile strength is 1670 MPa.
3) Pulley block installation: after the steel wire rope penetrates through the arch crown plate, a pulley block is arranged at the back of the arch crown plate, so that the steel wire rope reaches the pulley block of the opposite arch crown plate through the pulley block and is then anchored on the embedded part of the bottom bearing platform. The pulleys are in a group of two in parallel, one in and one out. The pulley block form is shown in figure 6.
4) Upper and bottom insert mounting: the tail end of a steel wire outside the T-shaped frame is fixed on the embedded part, the steel wire rope is penetrated and then fixed on the embedded part at the bottom of the bearing platform, the embedded part is composed of a 12mm steel plate and embedded steel bars, the diameter of each steel bar is 9mm, and the length of each steel bar is not less than 300 mm. The upper and lower embedded parts are of the same form, as in fig. 7.
Designing and checking the lifting lug: the bottom lifting lug is Q235B, and thickness is 10mm, and the biggest atress of single wire rope is 42.2KN (4.3t), so the biggest atress of lifting lug is 42.2KN (4.3t), through calculating, the lifting lug satisfies the requirement.
2.3 sealing System installation
The sealing system is mainly composed of a fixing piece and a sealing plate. The sealing plate, the reinforcing pressing plate, the pressing strip and the aluminum foil fiber cloth are connected through the bolt connection and the sealing adhesive tape.
1) Vault rim fixture mounting
The fixing piece of the vault edge mainly consists of an opening plate and a wedge, is used for fixing the sealing plate and is installed as shown in figure 8 a.
In the figure, a concrete wall (inner wall of an outer tank) 1, a vault 7, a perforated plate 10, an inclined iron 11 and a sealing plate combination 12.
2) The sealing plate assembly is installed, referring to fig. 8b (a schematic view of the overlapping position of the sealing plates of the sealing plate assembly),
in the figure, sealing plate 13, reinforcing pressure plate 14, aluminum foil fabric 15, bead 16, and overlapping portion 17 of adjacent sealing plates. The upper part of the sealing plate combination is bent and fixedly connected with the vault.
2.1) prefabricated sealing plates, reinforcing press plates and press strips.
2.2) installing sealing plates one by one, wherein the sealing plates are connected with the fixing piece through bolts and are connected in an overlapping mode, and the overlapping width is not less than 100 mm.
2.3) the total length of the sealing plate (the total length after lapping) is 1% longer than the perimeter of the prestressed concrete wall, so that the sealing element is prevented from bearing hoop stress in the jacking process.
2.4) strengthen with the reinforced pressing plate between the seal plate, then install aluminium foil fiber cloth, the fibre cloth adopts sealed sticky tape bonding sealing with reinforced pressing plate overlap joint department, then install the layering, pass the screw rod of welding on the closing plate (galvanized sheet) to the reinforced pressing plate at last and add the gasket, it is fixed to go up the nut, reinforced pressing plate self overlap joint is not sealed department and is adopted the sticky tape to seal, the overlap joint between the fibre cloth adopts the sticky tape to seal, other places adopt the sticky tape to seal according to the on-the-spot condition, the minimize is revealed.
2.5) large gaskets are arranged on two sides of all the connecting bolts to prevent falling off, and all the sealing materials are firmly adhered by using the sealing glue.
2.6) the opening in the seal plate must be accurately positioned to ensure that the seal is properly seated.
2.4 Fan System installation
The blower system mainly comprises a fan, an air duct, a control system and a power generation system. The sealing of big and small door openings is carried out before the blower is installed, and the opening of the wall plate of the door opening is connected with the air duct of the blower.
1) Temporary large and small door opening installation
Before the temporary large and small door openings are sealed, all the parts of the in-tank sealing system and the balance system are manufactured and transported to the tank, and objects influencing the work of the air-lift roof in the tank are cleaned up.
The large and small door openings are used for entering and exiting personnel, equipment, materials and the like in the construction process of the tank body. In the process of lifting the vault by the air jacking, the two door openings are temporarily sealed by steel plates, and air inlets of fans and personnel access channels are formed in the steel plates. In the present case, big door opening is used for seting up the fan air intake, and little door opening is used for seting up personnel access way.
1.1) prefabricating and installing the temporary large and small door opening seal according to the figures 9 and 10, and arranging an inlet and outlet channel outside the small door opening.
In the figure, a fan duct inlet 18, a personnel access 19.
1.2) all welding lines need to be subjected to sealing welding when the temporary large and small door opening sealing plates are prefabricated, and the appearance inspection of the welding lines is qualified.
1.3) the sealing of interim big or small door opening utilizes the jar wall built-in fitting of installing in advance, with thickness t being 6mm, the steel sheet that the material is Q235B welds on the built-in fitting with E7018-1 welding rod (with the second circle ring to the built-in fitting backing plate welding adopt ENICRMO-6 welding rod), and the welding adopts continuous welding, guarantees all around sealed, avoids the excessive loss of gas in the gas lift top process. Then install HW150 shaped steel in the steel sheet outside and consolidate, shaped steel and closing plate connection form is intermittent welding, and the concrete mode is: 100, (50) welding 100 empty 50;
1.4) temporary Large Gate Enclosed calculation
The temporary large door opening is sealed by a Q235 plate with t being 6mm (when the upper part of the sealing plate is welded with the second ring of circumferential embedded parts, the sealing plate is isolated by an NI9 backing strip), and the outer side of the door opening is reinforced by HW150 section steel.
Square meter with 27.3 holes
Length of welding seam L21400 mm
The maximum pressure is 1653.3Pa, 1653.3N/square meter, and P is 27.3 square meter, 1653.3N/m2, 45135N
Then, the weld shear stress is:
the strength of the door opening completely meets the requirement.
2) Installation of small door opening access way
2.1) install the inspection passageway that gets into in the jar in interim little door opening department, go out to go into the door and adopt the mode of interior division, the escape way establishes 2 doors, adopts in-opening door, two-way valve to be used for balanced pressure, like figure 11, door crack department installation rubber skin, the amount of wind loss of minimizing.
In the figure, a gate 20, B gate 21, and valve 22.
2.2) an emergency vent valve is arranged on the outer side of the small door opening, and the valve is 6-8 inches, so that emergency pressure relief and venting can be realized when emergency occurs.
2.3) the safety passage should be arranged with special person for monitoring during air lift, and make the registration of the entering and exiting personnel to prevent the irrelevant personnel from opening the door at will.
2.4) flow of the safety channel into the tank:
entering a tank: open a door → enter the space between a door and B door → close a door → open valve → open B door → close valve → close B door → enter tank.
Discharging: open valve → open B door → close valve → enter space between a door and B door → close B door → open a door → go out of tank → close a door.
All personnel entering the tank must go through the operation training of the closed space, enter the tank according to the admission permit, the guardian makes registration at the entrance, all personnel entering the tank hand over the work card to the channel manager before entering the tank, take back after going out of the tank.
Personnel entering the tank must constantly keep the interphone open to keep communication, the personnel cannot stay between the door A and the door B for a long time, and 2-3 people must enter and exit the tank in one group, so that no one person can enter the tank.
A warning lamp is arranged at an outlet in the tank, so that personnel in the tank can evacuate conveniently; non-workers are prohibited from entering the tank.
3) Blower installation and commissioning
3.1) calculation of wind pressure and wind quantity of fan
Weight of air lift top: g-932294 kg
a. Wind pressure calculation
Air pressure of air lift top: pLifting of wine＝1.1×G×9.8/S＝932294*1.1*9.8/(3.142*442)≈1653.3Pa≈168.7mmH2O (U-shaped water column) (K is 1.1-1.4) and K is 1.1
b. Air volume calculation
In consideration of air leakage loss, the air quantity of the fan needs to be corrected. Calculating according to a gas equation, wherein PV is constant under a certain temperature, and a calculation formula of the fan air volume is as follows: namely:
Qmax＝[(P0+Plifting of wine)V-P0VO]K/P0＝[(101325+1653.3)*309061.8-101325*46654]*3/101325
＝802352.1m3
Q- -blast volume, m3；
V- -total volume of tank body, m, at the completion of jacking3；
K-fan air volume correction coefficient, generally taking 3-4;
Plifting of wine-jacking wind pressure, pa;
V0volume enclosed by the crown and the tank before jacking, m3；
P0-standard atmospheric pressure, taking 101325 pa.
3.2) Fan model selection
According to the calculation, 4 ZGF5-1400D fans (1 fan for standby) are selected for the fan, the air is blown for 2.7 hours, and the air volume meets the requirement.
The parameters are as follows:
the model is as follows: ZGF5-1400D
Flow 97472-3/H
Full pressure 2279-4430Pa, (227.9-443mmH2O)
Rotating speed: 1150R/min
Power 110KW
3.3) blower settings, as in FIG. 12.
In the figure, a blower 23, an air duct shutter 24, and an air inlet adjusting valve 25 are provided, and the number + # indicates a blower number.
As shown in the figure, 4 air blowers are arranged in the air lifting jack, meanwhile, 4 air blowers are provided with four diesel generators, the generators are used as main power supplies, three air blowers are used in normal air lifting jack working, the 4# air blower is used as a standby air blower (normally started), the used change-over switch has an automatic switching function, if the generators break down, the automatic change-over switch can be immediately started and switched to a mains supply, and the air lifting jack working is prevented from being influenced by the faults of the generators.
The switching among the 1#, 2#, 3# blowers and 4# blowers needs to be carried out with switching debugging tests in advance to ensure that all the switching is normal.
And the blower system performs a power-off switching test to ensure that the generator and the power supply network can be normally switched.
During the working period of the air lift, the 1#, 2#, and 3# generators should be operated normally at the same time, if any one of the 1#, 2#, and 3# blowers fails, the air duct flashboard of the failed blower is closed immediately, and the air inlet volume of the 4# spare blower is increased;
and marking the opening scales of 0 percent, 25 percent, 50 percent, 75 percent and 100 percent on inlet adjusting air doors and outlet flashboards of 1#, 2#, 3# and 4# blowers by using red paint, and controlling the air inlet volume of the blowers by adjusting the opening scales of the air doors.
2.5 Intelligent monitoring System installation
The method adopts an independently developed intelligent storage tank dome attitude monitoring system (7117204 th written by soft book) to monitor the balance of the dome by utilizing the attitude monitoring system, and 8 distance measuring devices are uniformly arranged on the pressure bearing ring (45 degrees apart in pairs). Above the bearing ring, a magnetic attraction, adhesion or support fixing mode is adopted, and the distance measuring equipment is downwards arranged on the bearing ring and arranged inside the tank top at the tank top for reading pressure data in the tank.
2.6 gas jacking
1) Jacking Pre-and Pre-jacking inspection
1.1) before jacking, carrying out 2-hour operation test on a fan system and a power generation system and carrying out automatic switching test on a public power system and a generator system for multiple times.
1.2) pre-jacking before formal jacking, generally starting two fans, jacking for 200 plus 300mm, checking whether the longitudinal beam is completely separated from the edge support, and whether the sealing system is tightly attached, and timely repairing existing problems.
2) Formal jacking
2.1) starting No. 1, No. 2 and No. 3 blowers, slowly adjusting the opening degree of an air door, and increasing the air volume to ensure that the pressure is enough to jack the arch crown.
2.2) evenly arranging 20 sand bags on the channel at the outer side of the edge of the suspended ceiling, wherein each sand bag weighs about 25kg, when the tank rises by about 200-300mm, an inspector checks the sealing state and the balance state in the tank, and can adjust the balance by using the sand bags placed in advance when necessary.
And 2.3) according to the balance calculation of the vault, placing the bound steel bars at corresponding positions respectively, and binding the steel bars firmly by using steel wires to serve as the balance of the emergency adjustment vault. The vault counterweight emergency treatment is responsible for a specially-assigned person, and when an emergency situation occurs (the inclination deviation value is generally controlled within 200 mm), a counterweight emergency person is informed through an interphone to place a temporary emergency adjusting counterweight.
And 2.4) reading six position data by a monitoring person to judge whether the arch top is balanced during ascending, reporting the readings once every minute in the initial stage and the later stage, reporting the readings once every 3 minutes in the middle stage, and filling a gas lift record table.
2.5) continuing to increase the pressure and monitoring the ascending condition of the arch, and simultaneously checking and confirming whether the 24 guide steel ropes work normally.
2.6) continue to increase the pressure and monitor the rate of rise of the dome and confirm that the dome is always in equilibrium.
2.7) maintaining a certain pressure to control the rising speed to 255-.
2.8) if the vault is stuck to the inner wall of the concrete, the vault inclines and the like in the air-lift jacking process, people and tools are immediately lifted to the vault by using a hanging basket and the like for adjustment.
2.9) if one sealing fails, the vault continues to keep air lift; the air jacking command is issued, and the air quantity of the standby blower is increased, so that the air quantity is increased to make up for the loss of the air quantity.
2.10) at the initial stage of jacking, a specially-assigned person is required to carry out in-tank inspection to check whether all supporting joints are disconnected and whether sealing is perfect, and particularly, the tightness of the glass fiber cloth at the large and small door openings is specially noticed at the beginning of jacking.
2.11) when the vault reaches the position within about 3m, reducing the inlet flow of the fan, controlling the vault lifting speed to be 100-200mm/min, carrying out data analysis, adjusting the air pressure in time and ensuring the vault to stably rise and smoothly lift.
2.12) when the vault reaches the position within 2m, the measuring personnel of the monitoring group immediately checks and confirms whether the vault deviates in the angle and radius directions, and reports the deviation direction and data in time. If the deviation (the circumferential direction exceeds 100mm and the horizontal deviation exceeds 70mm) needs to be adjusted, when the arch top continues to rise to about 40cm away from the pressure-bearing ring, 5 tons of chain blocks are arranged on the pressure-bearing ring and the arch top plate by a standby riveting worker immediately, and the angle and the radius direction are adjusted by the contraction of the chain blocks.
2.13) after the vault is tightly attached to the pressure-bearing ring (the vault is in contact with the pressure-bearing ring slowly and uniformly to ensure line contact, local point contact is prevented, and local stress of the pressure-bearing ring is overlarge), the assembly and fixation of the vault and the pressure-bearing ring are carried out to complete air jacking, and the pressure is ensured to be maintained between 167.68-200mmH 20.
2.7 vault fixation welding
1) After the arch top plate is contacted with the pressure-bearing ring top plate, the personnel uniformly distributed on the arch top start to penetrate through the wedge to be fixed and pressed through the portal plate welded on the arch top plate in advance.
2) After the compression, a welder starts welding, and dehumidification is needed before welding, so that the welding requirements are met. And taking the radial beam as a center, and welding at least 600mm at two sides. The welding seam has to be welded with two layers, and the height of the welding corner is not less than 6 mm.
3) If the contact between the vault edge plate and the bearing ring is uneven and the gap is too large, the arch top edge plate and the bearing ring can be assembled by using an L-shaped plate and a jack, so that the assembly gap is reduced as much as possible.
4) And after all welding seams of the arch top plate and the pressure-bearing ring are completely welded, opening 1-2 perlite filling pipe orifices to slowly release pressure.
5) When the vault is fixedly welded, the gantry clamp and the gantry plate can be disassembled only when the longitudinal beam and the compression resistant ring are welded and the inspection and the detection are finished, and the supervision agreement must be obtained before the disassembly.
6) If power is suddenly cut off in the welding process, the generator is immediately used for generating power, and the normal operation of vault welding operation is ensured.
7) And (4) finishing welding inside and outside the vault, checking the orientation and elevation of the vault according to a drawing, recording if deviation exists, and submitting a report to a general packet, a supervision and an owner.
8) And after the vault is fixed and welded, carrying out soap bubble airtight leakage test on all welding lines of the vault. And (5) jacking and fixing the arch top.
2.8 data analysis
1) Data collection and analysis are carried out after jacking is completed, and jacking time and speed curves are shown in figure 13.
2) The amount of vault tilt versus time curve, fig. 14.
3) Jacking pressure-time curve, fig. 15.
Claims (7)
1. An intelligent dynamic monitoring gas jacking construction method for a low-temperature storage tank vault comprises the following steps: 1) installing a balance system, a sealing system and a fan system; 2) installing an attitude monitoring system; 3) performing air jacking operation on the vault; 4) fixedly welding the arch top;
in the step 1), a balance system is used for keeping the balance of the vault in the process of lifting the vault by using the gas cap; the sealing system is formed by paving a sealing layer at the contact position of the edge of the vault and the inner wall of the outer tank body, so that the air leakage amount is reduced as much as possible in the jacking and blowing process; the blower system blows air to the tank body to obtain air pressure for air jacking in the process of air jacking of the vault;
in the balance system, the balance system comprises a T-shaped support, a guide pulley and a steel wire rope, wherein the guide pulley is arranged on the T-shaped support and used for pulling the steel wire rope at the vault, and the steel wire rope is connected with the guide pulley in a matching way; the balancing system has a plurality of groups which are uniformly arranged around the axis of the storage tank;
for a group of balance systems, the tail end of a steel wire rope is fixed on the outer wall of a storage tank, the head end of the steel wire rope penetrates through a vault from top to bottom through a guide pulley, then a first pulley connected with the bottom surface of the vault is turned to be radial, and after the steel wire rope penetrates through the axis of the storage tank, a second pulley connected with the bottom surface of the vault is turned to be axial, and finally the steel wire rope extends downwards and is connected with a bearing platform in the storage tank; the first and second pulleys are symmetrical about the axis of the tank;
in the step 2), the attitude monitoring system is used for monitoring the balance of the vault, and the method comprises the following steps: a plurality of distance meters are uniformly arranged on the pressure bearing ring for measuring the height of the corresponding position of the vault and the lifting speed; installing a gyroscope on the vault to detect the horizontal posture of the vault; a barometer for monitoring the pressure in the tank is arranged; data acquired by the devices are sent to a background computer system, and construction is adjusted in real time according to all detection data;
the step 3) comprises the following steps:
3.1) checking before jacking and pre-jacking:
firstly, detecting a fan system;
then starting part of fans of the fan system, and jacking the vault to the height of the part; checking whether the edge support of the vault longitudinal beam and the vault is completely separated or not and whether the performance of a sealing system is normal or not; repairing the detected problems;
3.2) formal jacking
Starting all fans except the standby fan of the fan system, gradually adjusting the opening degree of the air door, and increasing the air quantity to enable the pressure in the tank to be enough to jack up the vault;
checking the balance state of the vault, and adjusting the balance state of the vault immediately;
when the distance between the vault and the preset height is 3m, reducing the inlet flow of the fan, and controlling the vault ascending speed to be 100-200 mm/min;
when the distance between the vault and the preset height is 2m, checking whether the vault deviates in the circumferential direction and the radial direction, and adjusting the deviation in time;
after the vault reaches the preset height and is tightly attached to the pressure bearing ring, maintaining jacking air pressure;
and in the step 4), assembling and fixing the vault and the pressure-bearing ring to finish the gas jacking and fixing of the vault.
2. The intelligent dynamic monitoring gas jacking construction method for the vault of the cryogenic storage tank as claimed in claim 1, wherein in the step 1), the step of 1.1) installing the balance system comprises:
1.1.1) installing a T-shaped bracket: all the T-shaped supports are uniformly distributed on the upper part of the tank top pressure-bearing ring; when the T-shaped supports are installed, the installation directions of the T-shaped supports are sequentially marked on the two pairs of T-shaped supports on the bearing ring by using a total station as a reference by using the azimuth angle of 0 degree, and tension meters for detecting the tension of the steel wire rope are installed on the two pairs of T-shaped supports; the connecting lines of the two pairs of T-shaped brackets penetrate through the axis of the storage tank and are mutually vertical; finally welding the prefabricated T-shaped bracket to the pressure bearing ring;
1.1.2) installing a steel wire rope: before the steel wire rope is installed, vertically projecting the installation position of the steel wire rope onto the arch top plate, and marking an opening; a sleeve is arranged at the position where the steel wire rope is contacted with the vault plate, and the steel wire rope reaches a tank below the vault through the sleeve;
after the steps 1.1.1) and 1.1.2) are finished, tensioning the steel wire rope and adjusting the initial tension of the steel wire rope
1.1.3) installing a pulley block: for the first and second pulleys, they are two parallel pulley sets; one pulley in the pulley block is used as a first pulley of the T-shaped bracket at the side and the steel wire rope, and the other pulley in the pulley block is used as a second pulley of the T-shaped bracket at the opposite side and the steel wire rope;
after penetrating through the arch top plate, the steel wire rope passes through the first pulley and the second pulley and is finally anchored on an embedded part of a bearing platform at the bottom in the tank;
1.1.4) upper and bottom insert installation: the tail end of the steel wire rope is fixed on the upper embedded part of the outer wall of the storage tank, and the head end of the steel wire rope is fixed on the bottom embedded part at the bottom of the bearing platform.
3. The intelligent dynamic monitoring gas jacking construction method for the vault of the cryogenic storage tank as claimed in claim 1, wherein in the step 1), the step of 1.2) installing the sealing system comprises:
1.2.1) installing a vault edge fixing piece, wherein the vault edge fixing piece is used for fixing a sealing plate;
1.2.2) sealing plate Assembly
1.2.2.1) prefabricating a sealing plate, a reinforcing pressing plate and a pressing strip;
1.2.2.2) connecting the sealing plates to the vault edge piece by piece through the fixing piece of the vault edge;
1.2.2.3) adjacent closing plate overlap joint, overlap joint coincidence part is strengthened with the reinforcing pressure plate, then installation aluminium foil fiber cloth, the fibre cloth adopts sealed sticky tape bonding sealing with reinforcing pressure plate overlap joint department, then the installation layering, pass the screw rod of welding on the closing plate to the reinforcing pressure plate at last and add gasket, the upper nut is fixed, reinforcing pressure plate self overlap joint seam is not sealed department and is adopted the sticky tape to seal, the overlap joint between the fibre cloth adopts the sticky tape to seal.
4. The intelligent dynamic monitoring gas jacking construction method for the vault of the cryogenic storage tank as claimed in claim 1, wherein in the step 1), a large door opening and a small door opening for storage tank construction are closed before a blower is installed, and an opening of a door opening wall plate is connected with an air duct of the blower; 1.3) in the process of installing a fan system, firstly, calculating the wind pressure and the wind quantity of a fan according to the weight of a gas lift; and selecting the type and the number of the fans, and selecting one more standby fan.
5. The intelligent dynamic monitoring gas jacking construction method for the vault of the cryogenic storage tank as claimed in claim 1, wherein in the attitude monitoring system, a monitoring management cloud platform is constructed based on a background computer system, and the monitoring management cloud platform is communicated with each terminal device through a network;
the real-time monitoring data of the attitude monitoring system comprises:
1) maximum height: measuring point data with the highest jacking height in the height measuring data at the same moment;
2) maximum height difference: in the height measurement data at the same moment, the difference value between the maximum height and the minimum height measured in all the measurement points is obtained;
3) average height: average height of all measurement points at the same time;
4) jacking speed: calculating the instantaneous rising speed of the dome according to the measured data;
5) average air pressure: calculating an average air pressure value according to the measurement reading of the barometer;
6) the elapsed time is as follows: recording the time used from the beginning to monitor the current;
7) the remaining time: calculating the estimated remaining time for completing jacking according to the instantaneous speed and the remaining height of the dome;
real-time monitoring data and raw data of a distance meter, a barometer and a gyroscope are stored in a database of the attitude monitoring system; the technology of monitoring data in real time is completed by an edge technology workstation in the attitude monitoring system;
and monitoring the data in real time, transmitting the data to the terminal equipment and displaying the data.
6. The intelligent dynamic monitoring gas jacking construction method for the vault of the cryogenic storage tank as claimed in claim 1, further comprising the steps of 5) data analysis: and (4) after jacking is finished, collecting and analyzing data, and drawing a jacking time and speed curve, a vault inclination amount-time curve and a jacking pressure-time curve.
7. The intelligent dynamic monitoring gas jacking construction method for the vault of the cryogenic storage tank as claimed in any one of claims 1 to 6, which is characterized in that the method is used for 22 ten thousand meters3And (5) performing air jacking construction on the vault of the low-temperature storage tank.
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| CN117569588A (en) * | 2024-01-17 | 2024-02-20 | 北京建工集团有限责任公司 | Construction method of annular self-balancing closed folded plate reticulated shell structure |
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Effective date of registration: 20221207 Address after: No.148 Xinhua Road, Liuhe District, Nanjing, Jiangsu 210044 Applicant after: CHINA NATIONAL CHEMICAL ENGINEERING NO.14 CONSTRUCTION Co.,Ltd. Applicant after: CHINA NATIONAL CHEMICAL ENGINEERING Co.,Ltd. Address before: No.148 Xinhua Road, Liuhe District, Nanjing, Jiangsu 210044 Applicant before: CHINA NATIONAL CHEMICAL ENGINEERING NO.14 CONSTRUCTION Co.,Ltd. |
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