CN101745748A

CN101745748A - Method for welding pile leg and pile shoe of drill platform

Info

Publication number: CN101745748A
Application number: CN201010042685A
Authority: CN
Inventors: 刘建成
Original assignee: China Merchants Heavy Industry Shenzhen Co Ltd
Current assignee: China Merchants Heavy Industry Jiangsu Co Ltd; China Merchants Heavy Industry Shenzhen Co Ltd
Priority date: 2010-01-07
Filing date: 2010-01-07
Publication date: 2010-06-23
Anticipated expiration: 2030-01-07
Also published as: CN101745748B

Abstract

The invention discloses a method for welding a pile leg and a pile shoe of a drill platform. The pile shoe comprises a pile shoe main body and an upright plate component. The method comprises the following steps of: a) welding the upright plate component on the pile leg; b) inserting the upright plate component connected with the pile leg into the pile shoe main body, and c) welding the upright plate component inside the pile shoe main body. The method of the invention solves the problem that the exterior of the pile shoe is difficult to weld because the working station space is narrow. The welding quality is ensured, the welding cost is saved and the construction period is shortened.

Description

The spud leg of drilling platforms and the welding method of shoe

Technical field

The present invention relates to offshore rig, particularly relate to a kind of spud leg of drilling platforms and the welding method of shoe.

Background technology

For some offshore oil drilling platforms, the CJ series platform of for example Dutch Gusto MSC company design, its spud leg root is to be welded in the shoe outside, and 18 weld seams will bear the weight (about 20950 tons of maximum weight) that platform rises fully, and its importance is well imagined.According to this class platform structure, weld seam between spud leg and the shoe has particularity, the space of welding post is narrow especially, as shown in Figure 1, about the about 135mm in gap between spud leg 2 and glide path 3 and the shoe 1, very narrow and small, so the engineering staff at all can't be from the outside welding of spud leg and shoe integral body.At present, for the CJ series platform of Gusto MSC company, each big shipyard has following three kinds of ways in the welding of handling spud leg root and shoe.

First kind of scheme is with more than pier 6 promotions to 3.5 of main hull meter, outside this weld seam is exposed to fully, and just can be with this weld seam welding.This scheme as shown in Figure 2.

Second kind of scheme is that to keep the pier height of main hull be 1.7 meters, and the residing position of shoe is digged pit 2.2 meters, outside equally this weld seam being exposed to fully, and just can be with this weld seam welding.This scheme as shown in Figure 3.

The third scheme is with the lifting tower structure of whole spud leg as a whole, shoe and spud leg is welded in advance finish, and then the lifting tower structural entity is installed from top to bottom.

Three kinds of above-mentioned schemes all have more defective and restriction, are analyzed as follows:

For first kind of scheme, the pier height of main hull will be established De Taigao, cause the materials demand amount of pier very greatly, and ship's bottom paint and other fitting operation all need to take very high scaffold, this will waste a lot of labor costs, and bring very large trouble for follow-up work.

For second kind of scheme, can weld by digging pit in principle, but same cost of idleness, and it almost is infeasible digging pit on those had carried out module place that pressure-bearing handles.

For the third scheme, according to common size, if first section spud leg height is 25.76 meters, the lifting tower height is 17.86 meters, adds that the lifting tower bottom is 1.7 meters to the distance on ground, and height overall has just reached 45.32 meters, add shackle, length of steel wire rope, height overall will because the loop wheel machine lifting altitude on the module place is limited, down be installed from the top of spud leg so be difficult to that whole lifting tower structure is entangled spud leg as a whole above 50 meters.And, because self-elevating drilling platform is the precision size by the lifting tower structure to be retrained spud leg keep linear state on the lifting tower structure, be not the precision of controlling the lifting tower structure by the linearity of spud leg, so this scheme is very unfavorable for the triangle location of lifting tower in the future.

Summary of the invention

Main purpose of the present invention is exactly at the deficiencies in the prior art, a kind of spud leg of drilling platforms and the welding method of shoe are provided, little former in shoe outside weldings station space thereby the problem that is difficult to weld solved owing to can be saved cost, the reduction of erection time on the basis that guarantees welding quality.

For achieving the above object, the present invention is by the following technical solutions:

A kind of spud leg of drilling platforms and the welding method of shoe, described shoe comprise shoe body and riser member, said method comprising the steps of:

A. described riser member is welded on the described spud leg;

B. will connect the described riser member of described spud leg inserts described shoe body from the top inside; With

C. in the inside of described shoe body described riser member is welded on the described shoe body.

Preferably, described riser member comprises rectangular first riser and has second riser of arc notch, and described method also is included in before the step a, and the minor face of described first riser is docked with the non-arc limit of described second riser becomes a plate.

Preferably, described riser member comprises two groups of described first risers and described second riser, among the described step a, will dock the formed two boards in back separately by two groups of described first risers and described second riser and be welded on vertically on the described spud leg.

Preferably, described two boards forms the angle of 60 degree.

Beneficial technical effects of the present invention is:

The method according to this invention, script is positioned at the intrinsic riser member of shoe to weld together with spud leg outside shoe earlier, and then will carry out the shoe interior welds in the riser member insertion shoe body, like this, because the intrinsic riser member of shoe and spud leg have been to weld to have got well, also just need not be again weld and be connected shoe and spud leg at the outside opposition of shoe board member and weld seam between spud leg, thereby solved because little former in shoe outside weldings station space thereby the problem that is difficult to weld, particularly, the present invention has following advantage:

1. because the outside weld seam that joins with spud leg of shoe can weld on other stations, be not subjected to the constraint of member on every side, thereby improve the welding quality at this place;

2. with respect to first kind of known scheme, can reduce the height of main hull pier, as remain on 1.7 meters, waste of material is avoided in easy construction simultaneously, thereby saves cost;

3. with respect to the third known scheme, can before spud leg does not insert shoe, carry out the precision control of lifting tower structure, make that the precision control of lifting tower structure is more accurate;

4. the construction environment that can facilitate for follow-up work better, thus improve the quality of products;

5. the height of spud leg butt joint will not be subjected to the influence of loop wheel machine sling height.

Generally speaking, the spud leg of drilling platforms of the present invention and the welding method of shoe can be saved cost, the reduction of erection time on the basis that guarantees welding quality.

Description of drawings

Fig. 1 is the vertical view of spud leg and shoe assembly structure;

The side view of spud leg and shoe when Fig. 2 welds for adopting first kind of known scheme;

The side view of spud leg and shoe when Fig. 3 welds for adopting second kind of known scheme;

Fig. 4 a-4d is the schematic diagram of a kind of embodiment of welding method of the present invention;

Fig. 5 is the flow chart of a kind of embodiment of welding method of the present invention.

The specific embodiment

In conjunction with the accompanying drawings the present invention is further described in detail by the following examples.

Please refer to Fig. 4 a-4d, in one embodiment, drilling platforms comprises shoe and spud leg 2, shoe comprises shoe body 1 and riser member, the position opening that shoe body 1 and spud leg 2 are relative, the riser member has two groups of (not illustrating respectively) first riser 4 (model can be EQ63-Z) and second risers 5 (model can be EH36-Z), and first riser 4 is a rectangle, and described second riser 5 is for having the shape of big arc notch on the rectangle profile.

Please refer to Fig. 4 a-Fig. 5, in a kind of preferred embodiment, the welding method of shoe and spud leg may further comprise the steps:

Step S1. docks the minor face of first riser 4 in two groups respectively with the non-arc limit of second riser 5 become a plate.

Step S2. is welded on formed two boards on the spud leg 2 vertically at weld seam 7 places.More preferably, two boards forms the angle of 60 degree.The first segment that the welding position of spud leg 2 is generally spud leg is its part bottom.

Step S3. will connect the inside that the riser member of spud leg 2 inserts shoe body 1 from top to bottom.，

Step S4. welds together riser member and shoe body 1 in the inside of shoe body 1.Shown in Fig. 4 d, the inside of shoe body 1 is represented on the left side of straight line ab, and the outside of shoe body 1 is represented on the right of straight line ab.

Because riser member 1 is to have welded in advance to insert in the shoe body 1 with spud leg 2 again, need not be again weld and be connected shoe and spud leg at the outside opposition of shoe board member 1 and weld seam between the spud leg 2, this with regard to having solved because little former in shoe outside weldings station space thereby the problem that is difficult to weld, guaranteed welding quality, save welding cost, shortened the duration.

Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.

Claims

1. the welding method of the spud leg of a drilling platforms and shoe, described shoe comprises shoe body and riser member, it is characterized in that, said method comprising the steps of:

A. described riser member is welded on the described spud leg;

2. welding method as claimed in claim 1, it is characterized in that, described riser member comprises rectangular first riser and has second riser of arc notch, described method also is included in before the step a, and the minor face of described first riser is docked with the non-arc limit of described second riser becomes a plate.

3. welding method as claimed in claim 2, it is characterized in that, described riser member comprises two groups of described first risers and described second riser, among the described step a, will dock the formed two boards in back separately by two groups of described first risers and described second riser and be welded on vertically on the described spud leg.

4. welding method as claimed in claim 3 is characterized in that, described two boards forms the angle of 60 degree.