CN110726006B - Large-span integral hoisting construction method for large-caliber long-distance pipeline - Google Patents
Large-span integral hoisting construction method for large-caliber long-distance pipeline Download PDFInfo
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- CN110726006B CN110726006B CN201911187061.2A CN201911187061A CN110726006B CN 110726006 B CN110726006 B CN 110726006B CN 201911187061 A CN201911187061 A CN 201911187061A CN 110726006 B CN110726006 B CN 110726006B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
- F16L1/036—Laying or reclaiming pipes on land, e.g. above the ground in the ground the pipes being composed of sections of short length
Abstract
The invention discloses a large-span integral hoisting construction method for a large-caliber long-distance pipeline, which comprises the following steps: preparing a pipe-sinking machine tool, and formulating a pipe-sinking operation scheme according to the pipe property, the pipe ditch depth, the pipe hanging length in the pipe ditch and the hoisting data; and hoisting the pipeline according to the working scheme of the lower ditch, and backfilling the pipe ditch in time after the pipeline of the construction section is completely lowered. The invention adopts mechanized construction, realizes the standardized laying of the large-caliber long-distance pipeline and is beneficial to popularization and use.
Description
Technical Field
The invention relates to a pipeline construction technology, in particular to a large-span integral hoisting construction method for a large-diameter long-distance pipeline.
Background
The large-diameter pipeline is difficult to install and construct, construction technology and hoisting safety need to be comprehensively considered, and reasonable construction organization design is formulated.
The current common pipeline construction method is as follows: measuring and paying off → pipeline transportation → trench excavation → foundation arrangement → pipeline welding → installation → anticorrosion treatment → backfilling → pumping inspection → inner anticorrosion → washing. However, the process is suitable for short-distance and small-caliber pipeline laying, is not suitable for large-caliber and long-distance pipeline laying, cannot ensure construction safety and construction quality, and is difficult to meet the requirement of mechanized construction.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a large-span integral hoisting construction method for a large-diameter long-distance pipeline, which adopts mechanized construction, realizes the standardized laying of the large-diameter long-distance pipeline and is beneficial to popularization and application.
The technical scheme is as follows:
a large-span integral hoisting construction method for a large-caliber long-distance pipeline comprises the following steps:
preparing a pipe-sinking machine tool, and formulating a pipe-sinking operation scheme according to the pipe property, the pipe ditch depth, the pipe hanging length in the pipe ditch and the hoisting data;
and hoisting the pipeline according to the working scheme of the lower ditch, and backfilling the pipe ditch in time after the pipeline of the construction section is completely lowered.
Further, the pipe properties include pipe strength, and the maximum allowable distance between the two supporting points is determined according to the pipe strength condition
The coefficient of the transverse welding seam of the pipe is sigma, the rated allowable stress of the pipe is, q is the unit length weight of the pipeline, and w is the bending resistance moment of the section of the pipeline.
Further, the pipe properties include a stiffness condition, and the maximum allowable distance between two supporting points is calculated according to the stiffness condition
E is the modulus of elasticity, I is the slope of the pipe, q is the weight per unit length of the pipe, and I is the moment of inertia of the section of the pipe.
Further, the pipe properties include maximum bending deflection between two fulcrums, the maximum bending deflection
E is the elastic modulus, I is the pipe section moment of inertia, q is the pipe unit length weight, and l is the pipe length.
Further, the pipeline properties include static variable of the pipeline, and the static variable of the pipeline
E is the elastic modulus of the pipeline, I is the inertia moment of the section of the pipeline, q is the unit length weight of the pipeline, and L is the length of the pipeline.
Further, after the pipe trench is excavated, preparation work before hoisting is carried out.
Further, the hanging length of the pipeline in the pipe ditch is determined according to the depth of the pipe ditch, the lifting height of a crane, the static variable of the pipeline and the degree of freedom of the end part of the pipeline.
Further, the hoisting data comprises the maximum distance between the two hoisting workshops, and the maximum distance between the two hoisting workshops is determined according to the depth of the pipe trench, the suspension length, the hoisting weight and the hoisting capacity of the two cranes.
Further, the hoisting data comprise the maximum distance between the two hoisting workshops during continuous hoisting, and the maximum distance between the two hoisting workshops during continuous hoisting is determined according to the depth of the pipe trench, the suspended length and the hoisting weight.
The invention has the technical effects that:
the invention adopts mechanized construction, realizes the standardized laying of the large-caliber long-distance pipeline, quantifies the construction process, realizes the scientization and standardization of the large-caliber long-distance pipeline, and is beneficial to popularization and use.
Drawings
Fig. 1 is a schematic view of a crane position according to the present invention.
Detailed Description
The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.
The large-span integral hoisting construction method of the large-caliber long-distance pipeline specifically comprises the following steps:
step 1: after the pipe trench is excavated, carrying out preparation work before hoisting;
1. the lower groove of the pipeline meets the following conditions:
a. the pipeline welding and nondestructive testing are finished and the inspection is qualified;
b. the pipeline is finished with anticorrosion joint coating and damage coating, and is qualified after inspection (the leakage is detected by using electric sparks again before the pipeline is placed into a ditch, the welded pipeline section is assembled under the ditch, and the leakage is detected by using electric sparks again before backfilling is qualified);
c. the depth (the elevation of the ditch bottom) and the width of the pipe ditch are retested and meet the design requirement;
d. collapse and stones in the pipe ditch are removed;
e. after the groove bottom of the stone square section is cleaned, a 150 mm fine sand layer (the grain diameter is less than or equal to 5mm) is paved;
f. and removing redundant accumulated soil between the pipeline and the pipe ditch to prevent the soil from being brought into the ditch when the pipeline is put into the ditch.
Step 2: preparing a ditch-descending machine tool, and making a ditch-descending operation scheme of the pipeline;
1. preparing a trenching implement comprising: crawler cranes, excavators, nylon slings, etc., and have been inspected to ensure safety in use.
2. The organization of personnel is clear in labor division and is handed over with the technology and the safety;
3. compiling a ditching work scheme and reporting the approval of a proprietor, wherein the ditching scheme comprises the following contents:
a. pile number, mileage and length of the lower ditch section of the pipeline;
b. the specification, the anticorrosion structure and the quality inspection (including welding, flaw detection and joint repairing) results of the lower groove section pipeline;
c. the number, the model and the equipment state of machines and tools used for the pipeline to drain;
c1, calculating related hoisting data;
fig. 1 is a schematic view of a crane position according to the present invention.
c1.1, calculating the maximum allowable distance between the two fulcrums according to the strength condition;
in the formula:
Sigma- - - -tube nominal allowable stress MPa (125-133)
q- -weight of pipeline per unit length kg/m
w-bending moment resistance cm of pipe section3 (D920×14.5)
And substituting the corresponding data into a calculation formula to obtain:
c1.2, calculating the maximum allowable distance between the two fulcrums according to the rigidity condition;
in the formula:
e- -elastic modulus (MPa) (2.0-2.2) x 10 at room temperature5；
i-the gradient of the pipeline, and generally taking 1 during hoisting;
q- - - -weight per unit length of pipe (kg/m)
I- -pipe section moment of inertia (cm)4)
I＝π(D4-d4)/64＝3.14*(924-89.14)÷64＝422653.4
And substituting the corresponding data into a calculation formula to obtain:
c1.3, maximum bending deflection between the two support points;
in the calculation formula, P is the self weight of the pipeline P ═ ql, and the formula is substituted to obtain:
in the formula:
e-modulus of elasticity (MPa) of (2.0-2.2) x 10 at room temperature5；
I- -pipe section moment of inertia (cm)4) Value 422653.4;
q- - - -the weight of the pipe per unit length (kg/m), 400 (including the anticorrosion weight);
l- - -pipe length (m);
and substituting the corresponding data into a calculation formula to obtain:
l is 100m, deltamax＝15699.43mm≈15.699m
L is 90m, deltamax＝10300.39mm≈10.300m
L is 80m, deltamax＝6430.486mm≈6.430m
L is 70m, deltamax＝3769.433mm≈3.769m
L is 60m, deltamax＝2034.646mm≈2.034m
L is 20m, deltamax＝25.11908mm≈0.025m
δmaxTake 5m, L is 75.123m
δmaxTaking 5.5m, L is 76.934m
δmaxTake 6m, L is 78.626m
δmaxTaking 6.5m, L is 80.215m
δmaxTake 7m, L as 81.715m
δ max is 7.5m, L is 83.137m
c1.4, calculation of static variation of pipeline
In the formula:
e- -modulus of elasticity MPa 2.1X 105
I- -pipe section moment of inertia cm4 422653.4
q- - - -weight per unit length of pipe kg/m 400 (including corrosion protection weight)
L- -length m of pipe
And substituting the corresponding data into a calculation formula to obtain:
taking L as 12m, WB＝11.44768mm＝0.011m
②, L is 20m, WB＝88.33085mm＝0.088m
③ L is 40m, WB＝1413.294mm＝1.413m
Fourthly, taking L as 60m, WB＝7154.799mm＝7.155m
⑤、WBTake 5m, L is 54.859m
⑥、WBTaking 5.5m, L is 56.181m
⑦、WBTake 6m, L is 57.417m
⑧、WBTaking 6.5m, L is 58.577m
⑨、WBTake 7m, L as 59.673m
⑩、WBTake 7.5m, L is 60.711m
c1.5, selecting a crane;
according to the actual situation of the site, the crane in the preferred embodiment of the invention is a QUY50 crawler crane, the length of the suspension arm is 19m, and the lifting performance of the specific main arm is shown in the table 1.
TABLE 1
c1.6, determining the working radius, as shown in the table 2;
TABLE 2
| Crane | Working radius 7m | Elevating capacity 19t |
| Crane (II) | Working radius 5.5m | Lifting weight 27t |
| No. three crane | Working radius 4.5m | Lifting capacity 37.5t |
c1.7, determining the suspended length of the pipeline in the pipe ditch according to the depth of the pipe ditch, the lifting height of a crane, the static variable of the pipeline and the degree of freedom of the end part of the pipeline, as shown in the table 3.
TABLE 3
(1) When the depth of the pipe ditch is 4m, the hoisting height of the crane is 1m, the static variable of the pipeline is 5m, and the degree of freedom of the end part of the pipeline determines that the suspension length of the inner pipe of the pipe ditch is within 38 m-55 m (a: when one end of the pipe ditch is a free end, the suspension length of the pipeline is about 55 m; and b: when one end of the pipe ditch is fixed, the suspension length of the pipeline is about 37.5 m).
(2) When the depth of the pipe ditch is 4.5m, the hoisting height of the crane is 1m, the static variable of the pipeline is 5.5m, and the suspension length of the inner pipe of the pipe ditch is within the range of 38.1 m-56 m (a: when one end of the pipe ditch is a free end, the suspension length of the pipeline is about 56 m; b: when one end of the pipe ditch is fixed, the suspension length of the pipeline is about 38.1 m).
(3) When the depth of the pipe ditch is 5m, the hoisting height of the crane is 1m, the static variable of the pipeline is 65m, and the suspension length of the inner pipe of the pipe ditch ranges from 39m to 57.5m (a: when one end of the pipe ditch is a free end, the suspension length of the pipeline is 57.5 m.b: when one end of the pipe ditch is fixed, the suspension length of the pipeline is 39 m).
(4) When the depth of the pipe ditch is 5.5m, the hoisting height of the crane is 1m, the static variable of the pipeline is 6.5m, and the suspension length of the inner pipe of the pipe ditch ranges from about 40m to 58.6m (a: when one end of the pipe ditch is a free end, the suspension length of the pipeline is about 58.6 m.b: when one end of the pipe ditch is fixed, the suspension length of the pipeline is about 40 m).
(5) When the depth of the pipe ditch is 6m, the hoisting height of the crane is 1m, the static variable of the pipeline is 7m, and the suspension length of the inner pipe of the pipe ditch ranges from 41m to 59.7m (a: when one end of the pipe ditch is a free end, the suspension length of the pipeline is about 59.7 m.b: when one end of the pipe ditch is fixed, the suspension length of the pipeline is about 41 m).
(6) When the depth of the pipe ditch is 6.5m, the hoisting height of the crane is 1m, the static variable of the pipeline is 7.5m, and the suspension length of the inner pipe of the pipe ditch ranges from 42.6m to 60.8m (a: when one end of the pipe ditch is a free end, the suspension length of the pipeline is about 60.8 m.b: when one end of the pipe ditch is fixed, the suspension length of the pipeline is about 42.6 m).
c1.8, determining the maximum distance between the two crane workshops according to the depth of the pipe trench, the suspended length, the hoisting weight and the hoisting capacity of the two cranes, wherein the data of the maximum distance between the two crane workshops is shown in the table 4.
TABLE 4
| Depth of pipe trench | 4m | 4.5m | 5m | 5.5m | 6m | 6.5m |
| Length of suspension | 55m | 56m | 57.5m | 58.5m | 60m | 61m |
| Hoisting weight | 44t | 44.8t | 46t | 46.8t | 48t | 48.8t |
| Two cranes for lifting | 54t | 54t | 54t | 54t | 54t | 54t |
| Maximum distance between hoists | 25m | 23m | 20m | 18m | 15m | 13m |
(1) When the depth of the pipe groove is 4m, the most unfavorable condition is that one end of the pipe end is a free end, the suspended length of the pipeline is about 55m, the lifting capacity is about 55 multiplied by 2 multiplied by 0.400-44 t, the lifting capacity of two cranes is about 27 multiplied by 2-54 t, and the maximum distance between the two cranes is (54-44)/0.4-25 m.
(2) When the depth of the pipe groove is 4.5m, the most unfavorable condition is that one end of the pipe end is a free end, the suspended length of the pipeline is about 56m, the lifting capacity is about 56 multiplied by 2 multiplied by 0.400-44.8 t, the lifting capacity of two cranes is about 27 multiplied by 2-54 t, and the maximum distance between the two cranes is (54-44.8)/0.4-23 m.
(3) When the depth of the pipe groove is 5m, the most unfavorable condition is that one end of the pipe end is a free end, the suspended length of the pipeline is about 57.5m, the lifting capacity is about 57.5 multiplied by 2 multiplied by 0.400-46 t, the lifting capacity of two cranes is about 27 multiplied by 2-54 t, and the maximum distance between the two cranes (54-46)/0.4-20 m.
(4) When the depth of the pipe groove is 5.5m, the most unfavorable condition is that one end of the pipe end is a free end, the suspended length of the pipeline is about 58.5m, the lifting capacity is about 58.5 multiplied by 2 multiplied by 0.400 to 46.8t, the lifting capacity of two cranes is about 27 multiplied by 2 to 54t, and the maximum distance between the two cranes is (54-46.8)/0.4 to 18 m.
(5) When the depth of the pipe groove is 6m, the most unfavorable condition is that one end of the pipe end is a free end, the suspended length of the pipeline is about 60m, the lifting capacity is about 60 multiplied by 2 multiplied by 0.400-48 t, the lifting capacity of two cranes is about 27 multiplied by 2-54 t, and the maximum distance between the two cranes is (54-48)/0.4-15 m.
(6) When the depth of the pipe groove is 6.5m, the most unfavorable condition is that one end of the pipe end is a free end, the suspended length of the pipeline is about 61m, the lifting capacity is about 61 multiplied by 2 multiplied by 0.400-48.8 t, the lifting capacity of two cranes is about 27 multiplied by 2-54 t, and the maximum distance between the two cranes (54-48.8)/0.4-13 m.
c1.9, determining the maximum distance between the two suspension workshops during continuous suspension according to the depth of the pipe trench, the suspension length and the suspension weight, wherein the specific data are shown in Table 5.
TABLE 5
When the depth of the pipe ditch is 4m, the suspended length of the pipeline is (55+ 37.5)/2-46.25 m, the lifting load is about 46.25 multiplied by 2 multiplied by 0.4-37 t, and the distance between two hoists is (54-37)/0.4-42.5 m.
② when the depth of the pipe is 4.5m, the suspended length of the pipe is (56+ 38.1)/2-47.05 m, the lifting capacity is about 47.05 multiplied by 2 multiplied by 0.4-37.64 t, and the space between two hanging workshops is (54-37.64)/0.4-40.9 m.
③ when the depth of the pipe ditch is 5m, the suspended length of the pipeline is (57+ 39)/2-48 m, the lifting capacity is about 48 multiplied by 2 multiplied by 0.4-38.4 t, and the distance between two cranes is (54-38.4)/0.4-39 m.
When the depth of the pipe ditch is 5.5m, the suspended length of the pipeline is (40+ 58)/2-49 m, the lifting load is about 49 multiplied by 2 multiplied by 0.4-39.2 t, and the distance between two cranes is (54-39.2)/0.4-37 m.
Fifthly, when the depth of the pipe ditch is 6m, the suspended length of the pipeline is (41+ 59)/2-50 m, the lifting capacity is about 50 multiplied by 2 multiplied by 0.4-40 t, and the distance between two hoists is (54-40)/0.4-35 m.
Sixthly, when the depth of the pipe ditch is 6.5m, the suspended length of the pipeline is (42.6+ 60)/2-51.3 m, the hoisting capacity is about 51.3 multiplied by 2 multiplied by 0.4-41.04 t, and the space between two hoists is (54-41.04)/0.4-31.5 m.
c1.10 selection of number of crane shifts
According to the calculation, 3 QUY-50 crawler cranes are adopted for hoisting.
d. Specification of nylon sling, weight of each limit sling and intact condition;
e. personnel organization and responsibility;
f. a ditch operation method and operation key points, attention points;
g. and (5) taking safety measures for the operation of ditching.
(1) The construction machine should be used properly according to the requirements of its technical performance. Mechanical devices that lack a safety device or that have failed a safety device cannot be used.
(2) The automatic alarm and signal device can be used for strictly forbidding to dismantle the safety device on the mechanical equipment, and monitoring, indicating, instrument alarm and the like. The debugging and the fault elimination thereof should be performed by the professional staff.
(3) And the machine in operation and running strictly prohibits the operation of maintenance, maintenance or adjustment.
(4) The mechanical equipment should be maintained on time, and when the conditions of leakage, overhaul, overload and operation with diseases are found, the use of the mechanical equipment should be stopped.
(5) Operators of mechanical equipment need to be healthy and qualified through professional training examinations, and can independently operate after obtaining operation certificates and special work type operation certificates issued by relevant departments.
(6) When the machine works, the operator cannot leave the work post or give the machine to a non-local operator for operation. Entry of extraneous personnel into the work area and the operator's room is strictly prohibited. The operation after drinking is forbidden.
(7) The machines operating two or more shifts daily are required to perform a shift-by-shift system. The operator must carefully fill out the commuting log.
(8) After the machine enters the operation site, construction technicians should take construction tasks and safety technical measures to the machine operators. The operator should be familiar with the working environment and construction conditions, follow the command, and comply with the on-site safety rules.
(9) The on-site construction responsible person should provide the necessary conditions for mechanical operation such as roads, hydropower, temporary machine sheds or parking places, and the like, and eliminate factors which hinder or are unsafe for the mechanical operation. Night work must be provided with adequate lighting.
(10) When the operation is performed in places which are in danger of mechanical safety and personal health, corresponding safety measures are taken by mechanical equipment. The operator must be equipped with suitable safety precautions.
(11) Before the operation, the operator needs to comprehensively understand the working site environment, the driving road, the overhead wire, the weight and the distribution of the building and the hung object.
(12) The hoisting machinery is provided with a signal device such as a loudspeaker or an electric bell with clear sound.
(13) Before operation, an operator needs to check the signal device and the brake, and the confirmation is sensitive and reliable.
(14) The hoisting operation should be instructed by a specially-assigned person, the hoisting commander should be closely matched with the hoisting machinery operator to execute a specified command signal, the sent command signal must be accurate and clear, the hoisting operator should operate according to the signal of the commander, and when the signal is inaccurate or wrong, the operator should refuse to execute the command signal and immediately inform the commander; the operator should stop the operation immediately, no matter any person sends the emergency danger signal.
(15) And in the open air, the hoisting operation should be stopped in severe weather such as strong wind, rain, snow, fog and the like with the grade of more than 6. After rain and snow pass, the test hanging is needed before operation; after the brake is confirmed to be sensitive and reliable, the operation can be carried out.
(16) The amplitude-variable indicator, the moment limiter, the lifting capacity limiter, various travel limit switches and the safety protection device of the lifting machinery are complete, sensitive and reliable, and cannot be adjusted or disassembled randomly; it is strictly forbidden to use a limiter and a limiting device instead of an operating mechanism.
(17) Before the hoisting machinery operator performs actions such as rotation, amplitude variation, lifting of a lifting hook, walking and the like, an audible signal is sent out to indicate.
(18) When the hoisting machinery works, people are strictly prohibited to stay, work or pass under the crane boom and the heavy object; when heavy objects are hoisted, people are strictly prohibited to pass through the device; crane personnel are disabled.
(19) The operator should work according to the performance specified by the hoisting machinery, and the crane is not overweight.
(20) And strictly forbidding the crane to carry out diagonal drawing, diagonal hoisting and hoisting of underground facilities or heavy objects solidified on the ground and objects with unknown weight.
(21) When the hoisting operation is performed near the overhead transmission line, the safety distance between any part of the crane and the overhead transmission conductor is not less than the specification of the following table.
Table 6 safe distance of crane usage from overhead power transmission conductor
(22) The construction of the adjacent road is approved by a road management department, a safety warning board is arranged during construction, a warning lamp is arranged during night construction, and the road traffic safety is well ensured by monitoring by a specially-assigned person if necessary.
And step 3: and hoisting the pipeline according to the working scheme of the lower ditch, and backfilling the pipe ditch in time after the pipeline of the construction section is completely lowered.
1. After the ditch-laying condition is met, the ditch should be laid and backfilled as soon as possible. In a construction section, the continuous length of the pipeline placed on the ditch is not more than 8 km.
2. The pipeline is put into the ditch and is subjected to combined operation by 3 QUY-50 crawler cranes, the cranes use nylon suspenders, the distances between the hoisting points refer to the above calculated data, the distance between the hoisting points and the welded junction is not less than 2 meters, and the hoisting height is not more than 1.0 meter.
3. When the pipeline is put into the ditch, the pipeline is prevented from colliding with the ditch wall, and when necessary (a stone square section), wood boards or straw bags are laid on the ditch wall at the protruding position of the ditch wall, the turning position of the pipeline ditch and the side of the pipeline arranged in 10m from the beginning of the pipeline, so as to prevent the anti-corrosion layer from being scratched.
4. And measuring the buried depth of the pipe top every 20m along the pipeline after the pipe is laid. Performing elevation measurement on the initial point, the middle point and the final point of the curve in the vertical curve section; and in the crossing section of the highway and the river, the height measurement of the pipe tops is carried out on the crossing two ends. The pipeline burial depth must meet design specifications and the slope must not be greater than 12%.
5. When the bending radius of the pipe ditch is not enough, the pipe ditch is processed in time, and the pipe is strictly forbidden to be laid down. The pipeline is matched with the bottom of the ditch after being put into the ditch, is tightly attached to the bottom of the ditch and is properly positioned without external force. The continuous suspension section is not more than 10 meters. If the pipe bottom is suspended, a method of removing high-convex earthwork or filling the pipe bottom with fine soil is adopted, so that the problem of pipeline suspension is solved, and shallow burying cannot occur.
6. The pipeline is arranged at the center of the pipe ditch, and the deviation from the center line of the ditch is less than 250 mm. In any case, the minimum spacing of the pipeline from the trench wall is up to 0.15 m.
The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (3)
1. A large-span integral hoisting construction method for a large-caliber long-distance pipeline comprises the following steps:
after the pipe ditch is excavated, carrying out preparation work before hoisting, preparing a pipe ditch descending machine tool, and formulating a pipe ditch descending operation scheme according to the pipe property, the pipe ditch depth, the hanging length of the pipe in the pipe ditch and hoisting data; the pipe properties include: the maximum allowable distance between two fulcrums is determined according to the strength condition of the pipeline
The coefficient of the transverse welding seam of the pipe is, sigma is the rated allowable stress of the pipe, q is the unit length weight of the pipeline, and w is the bending resistance moment of the section of the pipeline; calculating the maximum allowable distance between two supporting points according to the rigidity condition
E is elastic modulus, I is pipeline gradient, q is pipeline unit length weight, and I is pipeline section inertia moment; maximum bending deflection
E is elastic modulus, I is pipeline section inertia moment, q is pipeline unit length weight, and l is pipeline length; static variable of pipeline
E is the elastic modulus of the pipeline, I is the inertia moment of the section of the pipeline, q is the unit length weight of the pipeline, and L is the length of the pipeline; determining the suspended length of the pipeline in the pipe ditch according to the depth of the pipe ditch, the lifting height of a crane, the static variable of the pipeline and the degree of freedom of the end part of the pipeline;
and hoisting the pipeline according to the working scheme of the lower ditch, and backfilling the pipe ditch in time after the pipeline of the construction section is completely lowered.
2. The large-span integral hoisting construction method for the large-caliber long-distance pipeline according to claim 1, wherein the hoisting data comprises the maximum distance between two hoisting workshops, and the maximum distance between the two hoisting workshops is determined according to the depth of a pipe ditch, the suspended length, the hoisting weight and the hoisting capacity of two cranes.
3. The large-span integral hoisting construction method for the large-caliber long-distance pipeline as claimed in claim 1, wherein the hoisting data comprises the maximum distance between two hoisting workshops during continuous hoisting, and the maximum distance between two hoisting workshops during continuous hoisting is determined according to the depth of a pipe trench, the suspended length and the hoisting weight.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192368A (en) * | 2010-03-03 | 2011-09-21 | 五冶集团上海有限公司 | Large-span overhead pipeline sliding installation method |
| CN106120859A (en) * | 2016-07-02 | 2016-11-16 | 天鸿建设集团有限公司 | A kind of construction method of many pipeline sections immersed tube river crossing |
| KR101818669B1 (en) * | 2017-06-13 | 2018-01-16 | 이에스피 주식회사 | Soil Guard Structure |
| CN207554961U (en) * | 2017-11-30 | 2018-06-29 | 湖北天圜工程有限公司 | A kind of long distance pipeline steep slope region stringing mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160091114A1 (en) * | 2014-09-30 | 2016-03-31 | Kingman Farms, LLC | Irrigation pipe laying machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192368A (en) * | 2010-03-03 | 2011-09-21 | 五冶集团上海有限公司 | Large-span overhead pipeline sliding installation method |
| CN106120859A (en) * | 2016-07-02 | 2016-11-16 | 天鸿建设集团有限公司 | A kind of construction method of many pipeline sections immersed tube river crossing |
| KR101818669B1 (en) * | 2017-06-13 | 2018-01-16 | 이에스피 주식회사 | Soil Guard Structure |
| CN207554961U (en) * | 2017-11-30 | 2018-06-29 | 湖北天圜工程有限公司 | A kind of long distance pipeline steep slope region stringing mechanism |
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