CN209754330U - Anaerobic jar bottom plate structure - Google Patents

Abstract

The utility model provides an anaerobic tank bottom plate structure, anaerobic tank bottom plate is formed by polylith steel sheet tailor-welding, and Y direction border dislocation arrangement between the polylith steel sheet, X direction border end to end arranges, forms many parallel long welding seams that run through anaerobic tank bottom plate along the X direction, connects between the steel sheet and adopts steel sheet B border to buckle into the echelonment, with adjacent steel sheet A border overlap joint tailor-welding from top to bottom, the welding bead is laid along steel sheet A's edge. The utility model discloses the wave deformation that can the effective control bottom plate lead to because of polylith concatenation steel sheet welding to have solid structure, bearing capacity is strong, the smooth advantage in surface.

Description

Anaerobic jar bottom plate structure

Technical Field

The utility model relates to a large-scale storage tank jar body floor structure, concretely relates to anaerobic jar floor structure.

Background

in the industries of food, biology, chemical industry and the like, most of discharged wastewater belongs to high-concentration organic wastewater, such as corn starch wastewater, citric acid wastewater, beer wastewater, potato processing wastewater, alcohol wastewater and the like. The anaerobic tank can treat organic high-concentration wastewater by using the effects of precipitation separation, anaerobic microorganism fermentation, biogas collection and the like, and has the characteristics of small occupied area, high organic load, stronger impact resistance, more stable performance and simpler operation and management.

The anaerobic tank is large in size, a bottom plate of the anaerobic tank mainly bears the gravity of liquid above and the supporting force of a foundation below, the diameter of the bottom plate is several meters or even tens of meters, and the bottom plate is formed by splicing several or dozens of steel plates with different specifications. Welding is an extremely important link in engineering construction, so that the quality of engineering construction depends on the work of bottom plate engineering welding to a great extent, and a wide anaerobic tank bottom plate is formed by splicing and welding a plurality of steel plates. During the installation and construction of the bottom plate, the large-area flat plate subjected to tailor welding generates large wave deformation, and the deformation is very unfavorable for the manufacture and the use of the structure.

The query of the existing data and patents is about the welding bottom plate structure of the large-scale tank body, and the following query results are obtained:

1. A new method for eliminating welding deformation of the bottom of a metal oil tank; application No.: CN 201310050350.4; the applicant: footui; and (3) abstract: a novel welding method for eliminating serious deformation of a bottom plate of a metal oil tank after welding. The novel welding method for eliminating the deformation of the bottom of the metal oil tank comprises the following steps: 1) arranging plates; 2) in the step of welding the tank bottom plate and the tank wall plate, the outer side fillet weld of the tank bottom plate and the tank wall plate is welded, and then the inner side fillet weld of the tank bottom plate and the tank wall plate is welded; 3) and sequentially welding the tank bottom plates. The invention relates to a novel welding method for eliminating the deformation of a metal oil tank bottom, which is characterized in that a plate arrangement diagram is drawn according to the circular area of the tank bottom before construction, longitudinal and transverse welding lines are sequentially welded, the shrinkage rate is calculated, and lap joint allowance is reserved, so that the damage of slippage variable and stress concentration generated by the action force of thermal expansion and cold contraction between plates during welding is solved, and the accumulated stress can be effectively eliminated. The novel welding method for eliminating the deformation of the bottom of the metal oil tank is suitable for manufacturing and processing the metal oil tank with the thickness of 500m 3-10000 m 3.

2. A method for welding a bottom plate of a large flat-bottom storage tank; application No.: CN 201010509441.6; the applicant: linde engineering (hang state) ltd; and (3) abstract: a welding method for the bottom plate of large flat-bottom storage tank features that the welding deformation of the bottom plate of large flat-bottom storage tank can be effectively reduced, the flatness of bottom plate can be improved, and its service life can be prolonged.

3. A control method for deformation of a storage tank bottom plate installed by a flip-chip method; application No.: CN 201610585071.1; the applicant: electricity construction in Sichuan three companies; and (3) abstract: a control method for deformation of a bottom plate of a storage tank installed by a flip-chip method can avoid deformation of the bottom plate of a tank body caused by self gravity and guarantee flatness of the bottom plate after installation of the bottom plate. The control method for the deformation of the bottom plate comprises the following steps: 1) prefabricating a bottom plate; 2) rechecking the foundation of the storage tank; 3) assembling the bottom plates; 4) assembling and welding the bottom plate; 5) filling asphalt sand under the bottom plate; 6) and welding the edge plate of the bottom plate with the fillet weld of the tank wall at the bottom of the tank body to finish the installation of the bottom plate. The control method for the deformation of the storage tank bottom plate installed by adopting the flip-chip method can ensure the construction quality, avoid repeated construction, improve the construction efficiency and reduce the construction cost.

4. A welding construction method of a large-scale storage tank bottom plate; application No.: CN 201510788897.3; the applicant: china Sanyu group, Inc. and abstract: a welding construction method for a bottom plate of a large storage tank comprises the following steps of 1) splicing outer rings of the bottom plate by edge plates and inner rings of the bottom plate by a medium plate; 2) firstly, spot welding an edge plate; 3) spot welding the middle panel; 4) the fillet weld of the edge plate and the tank wall plate is welded by adopting a method of firstly intermittent welding and then full welding; 5) welding the rest length of the edge plate; 6) the fixed welding line of the middle-width plate and the edge plate also adopts a method of firstly carrying out intermittent welding and then carrying out full welding, and the length of each T-shaped welding line is at least 100 mm; 7) the splicing welding sequence of the middle webs is that interval welding is finished firstly, the length of a welding seam of each connecting plate at the junction of the welding seam and the splicing welding seam is finished by at least 100mm, and then the welding seam is fully welded; 8) and the residual stress and deformation of the welding seam are reduced by adopting a hammering method. The invention can effectively prevent the deformation of the bottom plate caused by direct full welding, improves the flatness of the welded bottom plate by more than 30 percent compared with the conventional welding method, and improves the integral forming and welding quality of the bottom plate, thereby ensuring the service life of the storage tank.

5. a tank manufacturing and welding method; application No.: CN 201110180943.3; the applicant: shanghai Co Ltd of Wu-Yuan group; and (3) abstract: a tank manufacturing and welding method is characterized by comprising the following steps: a. tank bottom plate preparation welding contains: (1) paving a bottom plate, and (2) welding the bottom plate; b. groove jar wallboard preparation welding (1), wallboard are laid (2), wallboard welding, contain: 1) the lower edge of the longitudinal welding seam is not welded for a while at 300mm, and the lower edge of the longitudinal welding seam is assembled with the next chord wall plate and then welded with the circular seam together; 2) during girth welding, welders are uniformly distributed around the tank for one circle and weld along the same direction; 3) before girth welding, selecting the arrangement distance of the anti-deformation clamps according to the thickness of the wall plate, wherein the distance of the wall plate clamps with delta =6mm is 300 mm; 4) and when the wall plate is welded, even multiple welders are selected, the welders are close in level, and the same vertical seam and circular seam welding parameters are adopted for welding. The tank manufacturing and welding method has the advantages of simple and convenient operation, strong operability and effective control of the welding deformation of the tank.

According to the query result, the welding bottom plate structure of the existing large-scale tank body has the characteristics of uneven surface, insufficient overall strength, difficult deformation of the overall welding structure, high bearing capacity and the like.

Disclosure of Invention

The utility model provides a structure in the time of welding anaerobic jar bottom plate welding construction can the effective control bottom plate warp because of the wave that polylith concatenation steel sheet welding leads to have solid structure, bearing capacity is strong, the smooth advantage in surface.

The technical scheme of the utility model is realized like this:

the anaerobic tank bottom plate is formed by welding a plurality of steel plates together, the Y-direction edges of the plurality of steel plates are arranged in a staggered manner, and the X-direction edges are arranged end to form a plurality of parallel long welding lines penetrating through the anaerobic tank bottom plate along the X direction, so that the steel plate arrangement is similar to the structural arrangement of a bricklaying wall, has stronger structural stability, and also provides a foundation for subsequent back bar arrangement; the steel plates are connected by bending the edges of the steel plates B into a step shape, and are in lap joint and tailor welding with the edges of the adjacent steel plates A up and down, and welding beads are laid along the edges of the steel plates A; compared with a mode of direct groove surfacing at the edge between steel plates, the mode of upper and lower lap-joint tailor-welding has stronger bearing capacity and difficult cracking of a welding seam; the tank bottom surface of the lap joint structure is smoother and more attractive, has no concave-convex feeling and is not easy to generate the phenomenon of stress concentration.

The back bar is welded along the X direction above a steel plate B on the side edge of the X-direction weld bead, the back bars are arranged in parallel, the back bars are used for rigidly fixing the whole base plate in the steel plate welding process so as to reduce the wave deformation in the welding process, and the back bars are dismantled after the welding work is finished and the back bars are completely cooled.

The welding bead is a multi-section short welding bead welded in sections, and the length of each section of welding bead is 250-350 mm; the welding path form of the multi-section short welding path is adopted, the effect of reducing welding shrinkage can be achieved, when the multi-section short welding path is welded, the welding line has a plurality of starting points and end points, the length of stress reaching the yield limit is reduced, the average value of the internal stress in the total length range of the welding line is reduced, the area where plastic deformation occurs is reduced, and the welding shrinkage is reduced.

The back bar is made of channel steel or I-shaped steel and other section steels; the section steel has better rigidity, and can keep the integral shape of the bottom plate from deforming.

Be connected for spot welding between back thick stick and the steel sheet B, make things convenient for the later stage to weld and demolish back thick stick after accomplishing.

The utility model has the advantages of as follows:

1. The anaerobic tank bottom plate structure has stronger bearing capacity, and welding seams are not easy to crack; the tank bottom surface of the lap joint structure is smoother and more attractive, has no concave-convex feeling and is not easy to generate the phenomenon of stress concentration.

2. The utility model discloses a segmentation welded multistage short welding bead can play the effect that reduces the welding shrink, and during the short welding bead welding of multistage, the welding seam has a plurality of starting points and terminal points, has reduced the length that stress reaches the yield limit, and the total length within range internal stress average value of welding seam reduces, and the region that takes place plastic deformation reduces, and the welding shrinkage volume diminishes.

Drawings

FIG. 1 is a top plan view of the bottom plate structure of the anaerobic tank of the present invention;

FIG. 2 is a sectional view taken along line A of FIG. 1;

The reference numbers and names are as follows:

1. The bottom edge of the tank body; 2. backing a bar; 3. a steel plate A; 4. a steel plate B; 5. and (7) welding a bead.

Detailed Description

Example 1

Anaerobic tank bottom plate diameter is 17m, anaerobic tank bottom plate is formed by splice welding after the square steel sheet cutting shaping of the wide 1.5m of polylith, Y direction border staggered arrangement between the steel sheet, X direction border end to end arranges, form 6 parallel long welding seams that run through anaerobic tank bottom plate along the X direction, the concatenation adopts steel sheet B to buckle into the echelonment between the steel sheet, ladder length is 83mm, with adjacent steel sheet A splice welding connection, bonding wire 5 is located steel sheet A's border position, a plurality of back bars 2 of welding above the steel sheet B in the mutual concatenation overlap region of steel sheet, back bar 2 is the channel-section steel of 12#, be spot welding connection between with steel sheet B, many short welding beads of welding bead 5 for the segmentation jump welding, the length of every section welding bead is 300 mm.

Claims (5)

1. The utility model provides an anaerobic jar bottom plate structure which characterized in that: anaerobic tank bottom plate is formed by polylith steel sheet tailor-welding, and Y direction border dislocation arrangement between the polylith steel sheet, X direction border end to end arranges, forms many parallel long welding seams that run through anaerobic tank bottom plate along the X direction, connects between the steel sheet and adopts steel sheet B (3) border to buckle into the echelonment, with adjacent steel sheet A (4) border overlap joint tailor-welding from top to bottom, welding bead (5) are laid along the edge of steel sheet A (4).

2. The anaerobic tank floor structure according to claim 1, wherein: and a back bar (2) is welded above the steel plate B (3) on the side of the X-direction welding bead (5) along the X direction.

3. The anaerobic tank floor structure according to claim 1, wherein: the welding bead (5) is a multi-section short welding bead which is welded in a segmented mode, and the length of each section of welding bead is 250-350 mm.

4. The anaerobic tank floor structure according to claim 2, wherein: the back bar (2) is made of channel steel or I-steel.

5. The anaerobic tank floor structure according to claim 2, wherein: the back bar (2) is connected with the steel plate B (3) through spot welding.