CN106285137A - The remodeling method of embed-type monolayer steel liquid storage structure - Google Patents

Abstract

The remodeling method of embed-type monolayer steel liquid storage structure, the steps include: (1) prospecting data according to former monolayer steel liquid storage structure, clears up construction environment；(2) former monolayer steel liquid storage structure is carried out interior anticorrosion, maintenance and reforming processing；(3) in the inside of former monolayer steel liquid storage structure, a newly-increased monolayer steel liquid storage structure, thus form double-deck steel liquid storage structure；(4) in inner canister (2), if being provided with arterial highway stiffening ring (3), and at 1/3rd of every one stiffening ring (3), it is each provided with one piece of stiffened panel (4), stiffened panel (4) welds trivet (5)；(5) in trivet (5), welding triangular steel plate (6)；(6) part between outer tank (1) and the inner canister (2) of double-deck steel liquid storage structure is packed layer (8)；(7) arranging artificial leak detection pipe (9), its one end is positioned in manhole (10), and the other end is positioned in packed layer (8), and is additionally provided with antiseep sensor (11) in pipe.

Description

The remodeling method of embed-type monolayer steel liquid storage structure

Technical field

The present invention relates to the new method of a kind of embed-type monolayer steel liquid storage structure transformation.

Background technology

At present, monolayer steel liquid storage structure is widely used in the every field in country's lifeline engineering, and it is related to The lifeblood of national economy, such as the liquid storage structure such as monolayer steel oil storage tank of Station in City and petrochemical enterprise.But, monolayer After affected by the ambient, easily there is chemical attack and electrochemical corrosion, cause liquid storage to leak in steel liquid storage structure, dirty Dye environment, the safety of harm people is with healthy.Further, after monolayer steel liquid storage structure goes out of use for a certain reason, as Fruit is not used or processes not in time, can cause the unnecessary wasting of resources, takies use space, underground, even safety hidden Suffer from.Although China widelys popularize in recent years substitutes traditional monolayer steel liquid storage structure with novel liquid storage structure, but this Means inevitably need first have the building of obstacle and other facilities to tear open around original monolayer steel liquid storage structure earth's surface Remove, then original monolayer steel liquid storage structure is dug from the ground and substitutes with novel liquid storage structure, the most again recover Facility important around its earth's surface.Tearing down and building flow process very complicated before and after it, required cost is huge, time-consuming.

Summary of the invention

It is an object of the invention to provide the remodeling method of a kind of embed-type monolayer steel liquid storage structure.

The present invention is the remodeling method of embed-type monolayer steel liquid storage structure, the steps include:

(1) according to the prospecting data of former monolayer steel liquid storage structure, clear up construction environment, by code, liquid storage structure is carried out Clean and purging, liquid remaining in liquid storage structure, corrosion dirty are thoroughly removed totally；Then in using cleaning cloth wiping tank, Until without dirty, without remaining liquid storage, iron-free iron mold mark and expose metal true qualities；

(2) former monolayer steel liquid storage structure is carried out interior anticorrosion, maintenance and reforming processing；

(3) in the inside of former monolayer steel liquid storage structure, a newly-increased monolayer steel liquid storage structure, thus form clad steel Liquid storage structure processed；Former monolayer steel liquid storage structure is as the outer tank 1 of double-deck steel liquid storage structure, newly-increased monolayer steel reservoir knot Structure is as the inner canister (2) of double-deck steel liquid storage structure；

(4) in inner canister 2, if being provided with arterial highway stiffening ring 3, and set at 1/3rd of every one stiffening ring 3 It is equipped with one piece of stiffened panel 4, stiffened panel 4 welds trivet 5, in trivet 5, is connected to stiffening ring 3；

(5) in trivet 5, triangular steel plate 6 is welded；Triangular steel plate 6 arranges the liquid convection of predetermined number Hole 7；

(6) part between outer tank 1 and the inner canister 2 of double-deck steel liquid storage structure is packed layer 8；Packed layer 8 by wood flour with The mixture of rubber grain is constituted；

(7) arranging artificial leak detection pipe 9, its one end is positioned in manhole 10, and the other end is positioned in packed layer 8, and manages Inside it is additionally provided with antiseep sensor 11；

Through interior anticorrosion, overhaul and reinforce after outer tank 1 should meet total axial force balance, total balanced radial force and stable Property check requirement；

Total axial force balance formula:

$\frac{{\mathrm{\πD}}^{2}P}{4}={\mathrm{\πD\σ}}_h\mathrm{\δ}+F_1---\left(a\right)$

Consequent outer tank 1 cylinder axial stress σ_h:

${\mathrm{\σ}}_h=\frac{PD}{4\mathrm{\δ}}-\frac{F_1}{\mathrm{\π}D\mathrm{\δ}}---\left(b\right)$

Control σ_h≤ [σ] ψ, then:

${\mathrm{\σ}}_h=\frac{PD}{4\mathrm{\δ}}-\frac{F_1}{\mathrm{\π}D\mathrm{\δ}}\≤\[\mathrm{\σ}\]\mathrm{\ψ}---\left(c\right)$

Total balanced radial force formula:

DLP=2L σ_θδ+F₂ (d)

Consequent outer tank 1 cylinder circumference stress σ_θ:

${\mathrm{\σ}}_{\mathrm{\θ}}=\frac{PD}{2\mathrm{\δ}}-\frac{F_2}{2L\mathrm{\δ}}---\left(e\right)$

Control σ_θ≤ [σ] ψ, then:

${\mathrm{\σ}}_{\mathrm{\θ}}=\frac{PD}{2\mathrm{\δ}}-\frac{F_2}{2L\mathrm{\δ}}\≤\[\mathrm{\σ}\]\mathrm{\ψ}---\left(f\right)$

The stability of outer tank 1 is checked:

[P]≥P_Y (g)

$P_Y=\mathrm{\γ}\left(\frac{2}{3}R+H_0\right)\sqrt{1+{K_0}^2}---\left(h\right)$

In formula:

D refers to the average diameter of outer tank 1；P is the design pressure of outer tank 1；δ is to overhaul and the wall thickness of outer tank 1 cylinder after reinforcing； F₁The axial force on end socket is acted on for sand；[σ] is the allowable stress of outer tank 1 material；ψ is the weld joint efficiency of outer tank 1 cylinder； F₂For the radial force of sand effect in the unit length of outer tank 1 cylinder；L is the unit length of outer tank 1 cylinder；[P] is outer tank 1 External pressure allowable, takes the smaller value of 1.25 times of external and internal pressure differences and 0.1MPa；P_YFor the outer tank 1 determined by outer tank 1 top earthing Design external pressure；γ is the severe of outer tank 1 top soil layer；R is the radius of outer tank 1 inner surface；H₀For ground identity distance outer tank 1 top surface Distance；K₀For outer tank 1 surrounding earth lateral pressure coefficient.

Usefulness of the present invention is: by unique construction method, solves monolayer steel liquid storage structure by week After the impact in collarette border, easily there is chemical attack and electrochemical corrosion, cause liquid storage seepage, pollute environment, the peace of harm people Complete with healthy weak point.It can also enough make full use of limited resource, it is to avoid the unnecessary waste of resource and peace The generation of full hidden danger.Simultaneously can also the weak point of replacing single-layer steel liquid storage structure effectively.Moreover, when in inner canister 2 Liquid storage seepage time, the wood flour in packed layer 8 can draw the liquid storage of seepage.If liquid storage structure internal reservoir oil type liquid, Rubber grain in packed layer 8 can occur a certain amount of volumetric expansion after meeting oil, it is possible to fills hole and the gap at permeability position, Stop the continuation seepage of oil storage.And, by the artificial leak detection pipe 9 arranged and the common work of antiseep sensor 11 With, the antiseep early warning of liquid storage structure more in time, more accurate.When liquid storage structure (such as, blast impulse under burst load action Effect, geological process etc.), the triangular steel plate 6 of setting and liquid convection hole 7 can alleviate liquid in liquid storage structure effectively Large-amplitude sloshing, reduces the liquid adverse effect to liquid storage structure inwall.Improved monolayer steel liquid storage structure, durability and resistance to Corrosivity is higher, safe and reliable, economic and practical.

Accompanying drawing explanation

Fig. 1 is longitudinal sectional schematic diagram of the present invention.Fig. 2 is horizontal sectional schematic diagram.

Detailed description of the invention

As shown in Figure 1 and Figure 2, the present invention prevents liquid storage seepage after being the transformation of a kind of embed-type monolayer steel liquid storage structure New method, the steps include:

(1) according to the prospecting data of former monolayer steel liquid storage structure, it is ensured that good construction environment, by code, reservoir is tied Structure is carried out and purges, and liquid remaining in liquid storage structure, corrosion dirty is thoroughly removed totally.Then with clean cloth wiping tank In, until without dirty, without remaining liquid storage, iron-free iron mold mark and expose metal true qualities；

(2) former monolayer steel liquid storage structure is carried out interior anticorrosion, maintenance and reforming processing；

(3) corresponding renovation technique means are used, in the inside of former monolayer steel liquid storage structure, a newly-increased monolayer steel Liquid storage structure, thus form double-deck steel liquid storage structure.Outside former monolayer steel liquid storage structure is as double-deck steel liquid storage structure Tank 1, newly-increased monolayer steel liquid storage structure is as the inner canister 2 of double-deck steel liquid storage structure；

(4) in inner canister 2, if being provided with arterial highway stiffening ring 3, and set at 1/3rd of every one stiffening ring 3 It is equipped with one piece of stiffened panel 4, stiffened panel 4 is welded with trivet 5, in trivet 5, is connected to stiffening ring 3；

(5), in trivet 5, it is welded with certain thickness triangular steel plate 6.In triangular steel plate 6, it is provided with some Liquid convection hole 7；

(6) part between outer tank 1 and the inner canister 2 of double-deck steel liquid storage structure is packed layer 8.Packed layer 8 by wood flour with The mixture of rubber grain is constituted；

(7) arranging artificial leak detection pipe 9, its one end is positioned in manhole 10, and the other end is positioned in packed layer 8, and manages Inside it is additionally provided with antiseep sensor 11；

Through interior anticorrosion, overhaul and reinforce after outer tank 1 should meet total axial force balance, total balanced radial force and stable Property check requirement.

Total axial force balance formula:

$\frac{{\mathrm{\πD}}^{2}P}{4}={\mathrm{\πD\σ}}_h\mathrm{\δ}+F_1---\left(a\right)$

Consequent outer tank 1 cylinder axial stress σ_h:

${\mathrm{\σ}}_h=\frac{PD}{4\mathrm{\δ}}-\frac{F_1}{\mathrm{\π}D\mathrm{\δ}}---\left(b\right)$

Control σ_h≤ [σ] ψ, then:

${\mathrm{\σ}}_h=\frac{PD}{4\mathrm{\δ}}-\frac{F_1}{\mathrm{\π}D\mathrm{\δ}}\≤\[\mathrm{\σ}\]\mathrm{\ψ}---\left(c\right)$

Total balanced radial force formula:

DLP=2L σ_θδ+F₂ (d)

Consequent outer tank 1 cylinder circumference stress σ_θ:

${\mathrm{\σ}}_{\mathrm{\θ}}=\frac{PD}{2\mathrm{\δ}}-\frac{F_2}{2L\mathrm{\δ}}---\left(e\right)$

Control σ_θ≤ [σ] ψ, then:

${\mathrm{\σ}}_{\mathrm{\θ}}=\frac{PD}{2\mathrm{\δ}}-\frac{F_2}{2L\mathrm{\δ}}\≤\[\mathrm{\σ}\]\mathrm{\ψ}---\left(f\right)$

The stability of outer tank 1 is checked:

[P]≥P_Y (g)

$P_Y=\mathrm{\γ}\left(\frac{2}{3}R+H_0\right)\sqrt{1+{K_0}^2}---\left(h\right)$

In formula:

D refers to the average diameter of outer tank 1；P refers to the design pressure of outer tank 1；δ refers to overhaul and the wall thickness of outer tank 1 cylinder after reinforcing； F₁Refer to that sand acts on the axial force on end socket；[σ] refers to the allowable stress of outer tank 1 material；ψ refers to the weld joint efficiency of outer tank 1 cylinder； F₂Refer to the radial force of sand effect in the unit length of outer tank 1 cylinder；L refers to the unit length of outer tank 1 cylinder；[P] refers to outer tank 1 External pressure allowable, takes the smaller value of 1.25 times of external and internal pressure differences and 0.1MPa；P_YRefer to the outer tank 1 determined by outer tank 1 top earthing Design external pressure；γ refers to the severe of outer tank 1 top soil layer；R refers to the radius of outer tank 1 inner surface；H₀Refer to ground identity distance outer tank 1 top surface Distance；K₀Refer to outer tank 1 surrounding earth lateral pressure coefficient.

The present invention is further spread out below by more specifically embodiment.

The major design data of this outer tank 1 known: welded joint coefficient: 0.85；Execution standard: NB/T47003.1-2009 " steel welding non-pressure vessel " and NB/T47015-2011 " pressure vessel welding code "；Material: steel plate Q235B；Steel pipe: 20#； Nominal volume: 40L；The radius R of outer tank 1 inner surface is 1.4m；Average diameter D of outer tank 1 is 2.806m；The design pressure of outer tank 1 Power P is 1.01 × 10⁵Pa；After maintenance and reinforcing, the wall thickness δ of outer tank 1 cylinder is 6mm；Severe γ of outer tank 1 top soil layer is 18kN/m³；The allowable stress [σ] of outer tank 1 steel plate materials is 235MPa；The weld joint efficiency ψ of outer tank 1 cylinder is 0.85；Outer tank 1 Unit length L of body is 1m；The external pressure allowable [P] of outer tank 1 takes the smaller value of 1.25 times of external and internal pressure differences and 0.1MPa；Ground Distance H away from outer tank 1 top surface₀For 1.3m；Outer tank 1 surrounding earth lateral pressure COEFFICIENT K₀Take 0.33.

The axial force of sand effect on outer tank 1 end socket:

$F_1=\frac{{\mathrm{\πD}}^2\mathrm{\γ}h}{4}=\frac{3.14\×{2.806}^2\×18}{4}\×\left(1.3+\frac{2.806}{2}\right)=300.721KN$

Axial stress on outer tank 1 cylinder:

${\mathrm{\σ}}_h=\frac{PD}{4\mathrm{\δ}}-\frac{F_1}{\mathrm{\π}D\mathrm{\δ}}=\frac{1.01\×{10}^5\×2.806}{4\×0.006}-\frac{300721}{3.14\×2.806\×0.006}=6.12MPa$

σ_h=6.12MPa≤[σ] ψ=235 × 0.85=199.75MPa

Meet requirement.

The radial force of sand effect in the unit length of outer tank 1 cylinder:

F₂=γ H₀DL=18 × 1.3 × 2.806 × 1.0=65.66KN

The circumference stress σ of outer tank 1 cylinder_θ:

${\mathrm{\σ}}_{\mathrm{\θ}}=\frac{PD}{2\mathrm{\δ}}-\frac{F_2}{2L\mathrm{\δ}}=\frac{1.01\×{10}^5\×2.806}{2\×0.006}-\frac{65660}{2\×1.0\×0.006}=18.146MPa$

σ_θ=18.146MPa≤[σ] ψ=235 × 0.85=199.75MPa

Meet requirement.

Stability is checked:

$\begin{array}{c}{P}_Y=\mathrm{\γ}\left(\frac{2}{3}R+H_0\right)\sqrt{1+{K_0}^2}=18\×\left(\frac{2}{3}\×1.4+1.3\right)\×\sqrt{1+{0.33}^2}\\ =42.332KPa\end{array}$

P_Y=42.332KPa≤[P]=0.1MPa

Meet requirement.

Claims (1)

1. The remodeling method of the most embed-type monolayer steel liquid storage structure, the steps include:

   (1) according to the prospecting data of former monolayer steel liquid storage structure, clear up construction environment, by code, liquid storage structure is carried out With purging, liquid remaining in liquid storage structure, corrosion dirty are thoroughly removed totally；Then in using cleaning cloth wiping tank, until Without dirty, without remaining liquid storage, iron-free iron mold mark and till exposing metal true qualities；

   (2) former monolayer steel liquid storage structure is carried out interior anticorrosion, maintenance and reforming processing；

   (3) in the inside of former monolayer steel liquid storage structure, a newly-increased monolayer steel liquid storage structure, thus form double-deck steel storage Liquid structure；Former monolayer steel liquid storage structure is as the outer tank (1) of double-deck steel liquid storage structure, newly-increased monolayer steel liquid storage structure Inner canister (2) as double-deck steel liquid storage structure；

   (4) in inner canister (2), if being provided with arterial highway stiffening ring (3) and each at 1/3rd of every one stiffening ring (3) It is provided with one piece of stiffened panel (4), stiffened panel (4) welds trivet (5), in trivet (5), is connected to stiffening ring (3)；

   (5) in trivet (5), welding triangular steel plate (6)；Triangular steel plate (6) arranges the liquid pair of predetermined number Discharge orifice (7)；

   (6) part between outer tank (1) and the inner canister (2) of double-deck steel liquid storage structure is packed layer (8)；Packed layer (8) is by wood Bits are constituted with the mixture of rubber grain；

   (7) arranging artificial leak detection pipe (9), its one end is positioned in manhole (10), and the other end is positioned in packed layer (8), and Antiseep sensor (11) it is additionally provided with in pipe；

   Through interior anticorrosion, overhaul and reinforce after outer tank (1) total axial force balance, total balanced radial force and stability should be met The requirement checked；

   Total axial force balance formula:

   $\frac{{\mathrm{\πD}}^{2}P}{4}={\mathrm{\πD\σ}}_h\mathrm{\δ}+F_1---\left(a\right)$

   Consequent outer tank (1) cylinder axial stress σ_h:

   ${\mathrm{\σ}}_h=\frac{PD}{4\mathrm{\δ}}-\frac{F_1}{\mathrm{\π}D\mathrm{\δ}}---\left(b\right)$

   Control σ_h≤ [σ] ψ, then:

   ${\mathrm{\σ}}_h=\frac{PD}{4\mathrm{\δ}}-\frac{F_1}{\mathrm{\π}D\mathrm{\δ}}\≤\[\mathrm{\σ}\]\mathrm{\ψ}---\left(c\right)$

   Total balanced radial force formula:

   DLP=2L σ_θδ+F₂ (d)

   Consequent outer tank (1) cylinder circumference stress σ_θ:

   ${\mathrm{\σ}}_{\mathrm{\θ}}=\frac{PD}{2\mathrm{\δ}}-\frac{F_2}{2L\mathrm{\δ}}---\left(e\right)$

   Control σ_θ≤ [σ] ψ, then:

   ${\mathrm{\σ}}_{\mathrm{\θ}}=\frac{PD}{2\mathrm{\δ}}-\frac{F_2}{2L\mathrm{\δ}}\≤\[\mathrm{\σ}\]\mathrm{\ψ}---\left(f\right)$

   The stability of outer tank (1) is checked:

   [P]≥P_Y (g)

   $P_Y=\mathrm{\γ}(\frac{2}{3}R+H_0)\sqrt{1+{K_0}^2}---\left(h\right)$

   In formula:

   D refers to the average diameter of outer tank (1)；P is the design pressure of outer tank (1)；δ is the wall of outer tank (1) cylinder after maintenance and reinforcing Thick；F₁The axial force on end socket is acted on for sand；[σ] is the allowable stress of outer tank (1) material；ψ is the weldering of outer tank (1) cylinder Seam coefficient；F₂For the radial force of sand effect in the unit length of outer tank (1) cylinder；L is the unit length of outer tank (1) cylinder； [P] is the external pressure allowable of outer tank (1), takes the smaller value of 1.25 times of external and internal pressure differences and 0.1MPa；P_YFor by outer tank (1) top Outer tank (1) the design external pressure that earthing determines；γ is the severe of outer tank (1) top soil layer；R is the radius of outer tank (1) inner surface；H₀ Distance for ground identity distance outer tank (1) top surface；K₀For outer tank (1) earth lateral pressure coefficient around.