CN2349127Y

CN2349127Y - Double-cylinder type suction anchor

Info

Publication number: CN2349127Y
Application number: CN 98208178
Authority: CN
Inventors: 徐继祖; 王翎羽; 丁红岩; 边启光; 吕新才; 梅峥荣
Original assignee: BOHAI Co CHINA NATIONAL OCEAN PETROLEUM CORP; HAIWANGXING OCEAN ENGINEERING TECHNOLOGY Co LTD TIANJIN CITY
Current assignee: BOHAI Co CHINA NATIONAL OCEAN PETROLEUM CORP; HAIWANGXING OCEAN ENGINEERING TECHNOLOGY Co LTD TIANJIN CITY
Priority date: 1998-09-21
Filing date: 1998-09-21
Publication date: 1999-11-17
Anticipated expiration: 2008-09-21

Abstract

The utility model relates to a double-cylinder type suction anchor which belongs to an improved type of a barrel-shaped suction anchor of a water floating system berthing device. An outer cylinder whose diameter is large and height is small is additionally arranged out of a traditional single cylinder type suction anchor, and the so-called double-cylinder type suction anchor is formed by sealing the top with a common top plate. In addition, a top plate of an inner cylinder and a top plate of an outer cylinder are respectively provided with a submersible pump to apply stepped suction force. When the outer cylinder of the anchor body is inserted in softer upper layer soil, the inner cylinder can be inserted in lower layer harder soil, wherein, the depth which is deeper, so the anchoring capacity can be enhanced. The type of the double-cylinder type suction anchor has unique adaptability for shallow water and foundation, wherein, the upper layer of which is soft, lower layer of which is hard, and the stratification of which is obvious.

Description

Bitubular type suction anchor

The utility model belongs to the remodeling of barrel-shaped suction anchor in the buoyancy aid mooring gear.

Traditional suction anchor is that the bottom opens wide, the inversion barrel shaped structure of armored pump water system on the end sealing.Required suction is installed in sinking to of suction anchor, and from the anchor top difference of pressure up and down that anchor top pumping system produces the step-down of drawing water in the anchor, its value is directly proportional with headwater depth and anchor top area with the anchor top.The barrel-shaped suction anchor of stock size gained suction under the big condition of the depth of water can make the anchor body sink to the seabed to reach the required degree of depth of anchor force, but under the more shallow condition of the depth of water (as the shoal water zone below 10 meters), gained suction often deficiency so that the anchor body sinks to the degree of depth of requirement.

The purpose of this utility model is a kind of modified version that overcomes the suction anchor of above-mentioned shortcoming of design.

The technical solution of the utility model: anchor tube that this type suction anchor is opened wide by the bottom and the anchor that diving pump is housed top are formed, it is characterized in that said anchor tube is the concentric bitubular, they are to add the big highly less urceolus (3) of a diameter outside the diameter inner core bigger than low height (4), and being bound by common top board (1) forms again.Ribbed stiffener (2) is arranged under the top board.On the top board of so constructing two separate space of inside and outside tube that form, respectively install two groups of diving pumps (5,6).Just form bitubular type suction anchor.This design for scheme is to be directly proportional with headwater depth and anchor top area with the anchor top according to sinker suction, and the principle that is directly proportional with anchor tube embedded depth of sinker resistance, make sinker overcome less sinker resistance with the less sinker suction of inner core early stage, the sinker suction that the sinker later stage increases with urceolus overcomes the sinker resistance of increase, thus the final bigger sinker degree of depth and the bigger anchoring ability of obtaining.Using method of the present utility model: sinker begins, by loop wheel machine the anchor body is vertically put into water, under the deadweight effect, the inner core lower edge at first touches the end and sinks to seabed (9) certain depth (at least one rice) and form necessary air-proof condition and just can open the diving pump (6) at inner core top from water-surface working boat, make the inner core top board produce difference of pressure (being downward suction) up and down, press anchor to sink to touch the end and go into mud certain depth (at least one rice) and also form necessary air-proof condition until the urceolus lower edge, open the diving pump (5) at urceolus top again, make urceolus produce follow-up suction, so interior, urceolus closes and the anchor body bitubular is sunk to require the degree of depth (the anchor top flushes with the seabed approximately), sinker finishes, and diving pump is regained.Weighing anchor is the inverse operation of sinker, promptly by diving pump water filling in anchor anchor jack-up is regained anchor by loop wheel machine is auxiliary again.For loop wheel machine is implemented sinker and weighed anchor, central authorities are provided with main hanger (7) on the anchor top, establish auxiliary hanger (8) on every side.

Preceence of the present utility model: 1. the anchor top area of bitubular anchor significantly greater than with the anchor top area of the cooresponding conventional monotubular anchor of inner core, so under the same depth of water, can obtain bigger sinker suction, make anchor sink to the bigger degree of depth.This advantage is particularly evident under the shallow water condition; 2. for the obvious situation of (upper strata is soft, lower floor is hard) of seabed soil property layering, suitably design-calculated bitubular anchor can make urceolus sink under the situation of appropriate depth inner core is sunk to the big degree of depth of hard stratum, thereby effectively improves anchoring ability.Illustrated below in conjunction with drawings and Examples.

Fig. 1 is the elevation drawing of the related bitubular type of the utility model suction anchor.Fig. 2 is the planar view of the related bitubular type of the utility model suction anchor.1-top board among the figure; 2-top board ribbed stiffener; The 3-urceolus; The 4-inner core; 5-urceolus diving pump;

6-inner core diving pump; 7-master's hanger; 8-assists hanger; The 9-seabed

Embodiment: a kind of bitubular type suction anchor, its top board and inside and outside by steel plate (thickness 20mm) welding

Become, anchor top 1 divides into ribbed stiffener 2, and the top is equipped with

diving pump

5 and 6, is corresponded respectively to urceolus 3

And inner core 4, can implement independently that sinker is carried out in pump water operation, the operation of weighing anchor, anchor is top-loaded with main hanger

7 reach auxiliary hanger 8, so that assisted sinker and weighed anchor by loop wheel machine, the diving pump pipeline causes water surface worker

Do on the ship, by the control of implementing on the repair ship to sink, weigh anchor.Fitting of the type of the bitubular shown in this figure suction anchor

Answering the depth of water is 5～40m; Soil property is the last soft tangible cohesive soil of hard layering (the layering interfaces degree of depth down

Be about 3m).The sinker extreme depth is the following 6m in seabed (9), design level mooring force 80t,

Design vertical mooring force 40t.

Claims

1 one kinds of bitubular type suction anchors are made up of bottom anchor tube of opening wide and the anchor top that diving pump is housed, and it is characterized in that said anchor tube is the concentric bitubular, and said anchor top is the plectane of the capping bitubular.

2. according to the suction anchor of claim 1, it is characterized in that the said bitubular is to add the big highly less urceolus of diameter by the diameter inner core bigger than low height to bind with common top board and form.

3. according to the suction anchor of claim 1, it is characterized in that being equipped with and inner core and the cooresponding diving pump of urceolus on the said anchor top.