Precise positioning and mounting method for embedded anchor plate of bimetal low-temperature tank bearing platform

Abstract

According to the precise positioning and mounting method for the embedded anchor plates of the bimetal low-temperature tank bearing platform, after a bimetal low-temperature tank bearing platform formwork is mounted, the position of each embedded plate is marked through white spray paint, and the mounting positions of the embedded anchor plates are reserved in the bearing platform reinforcing steel bar binding process; a total station is erected at the center point of a bearing platform, dotting positioning is evenly distributed along the circumference, a level gauge is erected to control the top elevation of an embedded anchor plate, after the position is determined, steel bars are arranged for fixing, position deviation during concrete pouring is prevented, the positioning mode is simpler, more convenient and more efficient, the paying-off and line hanging steps can be simplified, the influence of concrete pouring on the size precision is prevented, and the construction efficiency is improved. Errors in the installation process of the bimetal low-temperature storage tank bearing platform pre-embedded anchor plate are reduced, and the installation positioning precision of the pre-embedded anchor plate is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of foundation structure construction, and particularly relates to a precise positioning and installation method for a bimetal low-temperature tank foundation pre-buried anchor plate. BACKGROUND

[0002] With the layout of the national energy strategy, the establishment of the clean energy LNG "production, supply, storage and sales" system, in recent years, the construction of domestic 50,000 cubic meters and above bimetal full-content low-temperature tanks has shown an increasing trend year by year. The construction technology of the low-temperature tank requires low-temperature resistance. Because the tank body has a large volume, a large weight, and a special material welding process, the installation precision of the pre-buried anchor plate is also increasingly required. Each bimetal low-temperature tank foundation has hundreds of pre-buried anchor plates. The pre-buried anchor plate has a large specification, and each pre-buried anchor plate weighs several dozen kilograms. The installation has many difficulties, and the positioning and reinforcement precision is high. The previous method is complicated, has high requirements for the tank bottom plate laying, and has low construction efficiency. SUMMARY

[0003] To solve the above problems, the application discloses a precise positioning and installation method for a bimetal low-temperature tank foundation pre-buried anchor plate, which is simple and efficient, can simplify the wire laying and hanging steps, prevent the influence of concrete pouring on the size precision, reduce the error in the installation process of the bimetal low-temperature tank foundation pre-buried anchor plate, and improve the installation positioning precision of the pre-buried anchor plate.

[0004] To achieve the above purpose, the technical scheme of the application is as follows: The precise positioning and installation method for the bimetal low-temperature tank foundation pre-buried anchor plate comprises the following steps: (1) The bimetal low-temperature tank foundation pouring mode is warehouse pouring, and the middle area of the foundation is poured in the first stage. After the foundation formwork is installed, the position of each pre-buried plate is marked with white self-spraying paint, and the pre-buried anchor plate installation position is reserved during the foundation steel bar binding process. (2) The steel plate is inspected, lined, and cut. The cutting adopts a semi-automatic flame cutting machine cutting method, and the surface is polished to be smooth after flame cutting.

[0005] The cut steel plate is welded into a pre-buried anchor plate, the outside is a protective sleeve, and the anchor band is vertically inserted into the protective sleeve. (3) The center point coordinates of the foundation are measured and pile pegs are set. The center point coordinates of the foundation are the center points of the plurality of pre-buried anchor plates. (4) The foundation steel bar is bound. (5) The pre-buried anchor plate is left with holes. The anchor band is a reserved hole: 250x250x1060h. There are a total of 480 reserved holes, the curvature between the reserved holes is 2.8125°, and the starting point of the reserved hole is 0° north and 1.40625° east.

[0006] (6) Positioning of the pre-embedded anchor plate; using a total station, steel tape, and level to control the installation of the anchor plate from multiple directions including angle, radius, and elevation; (7) Welding and fixing of the pre-embedded anchor plate; (8) Pouring of the concrete for the pile cap.

[0007] As a supplement to the present application, a base is provided below the pre-embedded anchor plate in step (2).

[0008] As a supplement to the present application, 100% PT detection is performed at the weld of the pre-embedded anchor plate in step (2).

[0009] As a supplement to the present application, the measurement of the center point coordinates of the pile cap in step (3) is measured using a total station.

[0010] As a supplement to the present application, the reinforcement binding of the pile cap in step (4) is as follows: 1) Before binding the reinforcement, first lay a line on the base mold, mainly the central zone reinforcement starting position line and the ring zone reinforcement starting position line, and place the cushion block before binding the bottom reinforcement; the thickness of the cushion block is equal to the thickness of the concrete protective layer; 2) According to the construction section sequence in the drawing, bind the reinforcement in sections When binding, proceed from the outer ring to the inner ring, first arrange the bottom reinforcement mesh, place the horse stool after binding is complete, and then bind the upper mesh; The bottom reinforcement mesh of the pile cap is two layers.

[0011] As a supplement to the present application, the positioning of the pre-embedded anchor plate in step (6) is to center on the center point coordinates of the pile cap, evenly distribute the points along the circumference, and after the position of the pre-embedded anchor plate is determined, set the measure reinforcement on the outside for fixation.

[0012] Use a steel tape to control the positioning of the embedded part, and set up a level near the center point to control the top elevation of the pre-embedded anchor plate.

[0013] Weld two measure reinforcements in the middle of the pre-embedded anchor plate to fix the pre-embedded anchor plate; weld four measure reinforcements at the bottom of the pre-embedded anchor plate with the bottom plate reinforcement to fix and control the height of the pre-embedded anchor plate.

[0014] During the welding process, place a magnetic level on the pre-embedded anchor plate to control the perpendicularity of the pre-embedded anchor plate.

[0015] The beneficial effects of the present application are: The double-metal low-temperature tank bearing platform pre-buried anchor plate precise positioning installation method provided by the application marks the position of each pre-buried plate by using white self-spraying paint after the double-metal low-temperature tank bearing platform template installation is completed, and the pre-buried anchor plate installation position is reserved during the bearing platform steel bar binding process; a total station instrument is erected at the bearing platform center point, and is evenly distributed and positioned along the circumference, a level instrument is erected to control the top elevation of the pre-buried anchor plate, after the position is determined, the steel bar is set to be fixed to prevent the position from being deviated during the pouring of concrete, the positioning method is more simple and efficient, the line laying and hanging steps can be simplified, the influence of the concrete pouring on the size precision is prevented, the error in the pre-buried anchor plate installation process of the double-metal low-temperature tank bearing platform is reduced, and the installation and positioning precision of the pre-buried anchor plate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The pre-buried anchor plate fixing schematic diagram provided by the application.

[0017] Figure 2 The bearing platform sub-bin pouring schematic diagram provided by the application.

[0018] Figure 3 The white self-spraying paint marking schematic diagram provided by the application. DETAILED DESCRIPTION

[0019] The application will be further illustrated by combining the drawings and the specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the application and are not used to limit the scope of the application.

[0020] Taking a liquid chemical storage project of a certain port area of Qingdao Port as an example, one 50000m³ double-metal low-temperature tank needs 240 pre-buried anchor plates, each pre-buried anchor plate has a specification of 200*18*1060 (length), and each pre-buried anchor plate weighs 30kg, and the pre-buried anchor plate installation has high position requirements, perpendicularity and elevation requirements, and adjacent arc length requirements.

[0021] In view of this situation, the application develops a double-metal low-temperature tank bearing platform pre-buried anchor plate precise positioning installation method, the double-metal low-temperature tank bearing platform pouring method is sub-bin pouring, and the middle area of the bearing platform is poured in the first stage, after the bearing platform template installation is completed, the position of each pre-buried plate is marked by using white self-spraying paint, and the pre-buried anchor plate installation position is reserved during the bearing platform steel bar binding process; the advantages are: ① avoiding bearing platform steel plate binding rework; ② improving the pre-buried anchor plate installation efficiency.

[0022] A total station instrument is erected at the low-temperature tank bearing platform center point, is evenly distributed and positioned along the circumference, a level instrument is erected to control the top elevation of the pre-buried anchor plate, after the position is determined, the steel bar is set to be fixed to prevent the position from being deviated during the pouring of concrete.

[0023] The specific steps are as follows: Step (1): Prefabricate the steel plate into an embedded anchor plate; First, inspect the quality of the steel plates, take anti-corrosion measures, and then mark and cut them according to the construction drawings.

[0024] The cutting process uses a semi-automatic flame cutting machine, and the surface is polished to a smooth finish after flame cutting.

[0025] The cut steel plates are welded into embedded anchor plates, with a protective sleeve 2 on the outside, such as... Figure 1 As shown, the anchoring strip 1 is vertically inserted into the protective cylinder 2 (a base can be provided below the pre-embedded anchor plate for easy positioning). In addition, the weld of the pre-embedded anchor plate should be 100% inspected by PT.

[0026] Step (2): Locate the center point The coordinates of the center point of the foundation were measured using a total station and pile nails were set. The coordinates of the center point of the foundation are also the center points of multiple pre-embedded anchor plates.

[0027] Step (3): Binding of foundation reinforcement 1) Before tying the reinforcing bars, first mark the lines on the bottom formwork, mainly the starting position lines of the central area reinforcing bars and the starting position lines of the ring area reinforcing bars. Place the spacers before tying the bottom reinforcing bars. 2) According to the construction section sequence in the drawings, the reinforcing bars are tied in sections. When tying, start from the outer ring and work inward. First, lay the bottom layer of reinforcing mesh, and after tying, place the stirrups. Then tie the upper layer of mesh. In order to ensure that the joints of the reinforcing bars in each section match, a certain reinforcing bar on a certain axis is designated as the reference when tying the reinforcing bars of the entire foundation. The corresponding positioning reinforcing bars of the upper layer of reinforcing mesh are aligned with a plumb bob. 3) The bottom layer of the foundation consists of two layers of steel mesh. Within a radius of 26.5~31.8m, the bottom radial reinforcement consists of 1440 HRB400E steel bars with a diameter of 28mm; the top radial reinforcement consists of 1440 HRB400E steel bars with a diameter of 28mm; within a radius of 0~26.5m, both the bottom and top layers consist of HRB400E steel bars with a diameter of 25mm, spaced at 150mm intervals. The bottom horizontal reinforcement is placed according to the pre-defined positioning, and after binding, stirrups are placed, followed by the top layer reinforcement. The stirrup reinforcement is 25mm diameter HRB400E. When binding the reinforcement, the number, elevation, and position of stirrups should meet the requirements of the drawings, with at least one stirrup per two square meters. The thickness of the concrete pad is equal to the thickness of the concrete cover.

[0028] Step (4): Pre-embed anchor plate holes According to the design drawings, the anchor strip has a reserved hole of 250×250×1060 (h). There are a total of 480 reserved holes. The arc between the reserved holes is 2.8125° evenly distributed. The starting point of the reserved hole is 1.40625° east of due north 0°.

[0029] Step (5): positioning of pre-embedded anchor plate 1) Set up a total station instrument at the center point of the pile cap, and set up a level near the total station instrument, and level and center all the instruments; 2) Prepare a 50 m steel ruler, and align the steel ruler 0 m point with the pile cap center point stake; 3) Use the total station instrument to measure the angle to position the pre-embedded anchor plate center line position, and weld two measure steel bars 3 at the middle of the pre-embedded anchor plate to fix the protection cylinder 2; use the level to measure the elevation to determine the height of the pre-embedded anchor plate, and weld four measure steel bars with the bottom plate steel bars to fix the pre-embedded anchor plate height.

[0030] Step (6): pre-embedded anchor plate welding and fixing; The construction personnel pull the ruler to measure the pre-embedded anchor plate radius, and the surveyor re-checks the pre-embedded anchor plate angle and elevation, and confirms that there is no error, then the pre-embedded anchor plate is welded and fixed with the pile cap main reinforcement, and a magnetic level is placed on the pre-embedded anchor plate during the welding process to control the perpendicularity of the pre-embedded anchor plate.

[0031] Step (7): pile cap concrete pouring (two safety passages are provided for the construction personnel to go up and down).

[0032] After pouring, the pre-embedded anchor plate is accepted for radius, perpendicularity and elevation, the actual measurement of the pre-embedded anchor plate installation radius deviation is within ± 6 mm, the perpendicularity and elevation deviation is within ± 3 mm, and the adjacent arc length deviation is within ± 6 mm, which saves the cost of 220,000 yuan under the premise of ensuring the quality, and shortens the construction period by 16 days.

[0033] As shown in Figure 1 The bimetallic low-temperature tank protection measure is an anchor belt (pre-embedded anchor plate) cylinder mode, wherein the anchor belt 1 is vertically inserted into the protection cylinder 2, the upper end of the anchor belt 1 is welded to the inner tank wall plate component connection, the lower end penetrates through the circumferential concrete, the secondary bottom plate, the bottom plate insulation and the pile cap anchor cylinder, and is welded and fixed with the stop plate; the anchor belt cylinder mode connects the inner tank and the pile cap into a solid whole, in the case of earthquake, the anchor belt limits the inner tank to shake, and allows the anchor belt to slightly move in the anchor cylinder, which has little effect on the overall structure of the pile cap.

[0034] It should be noted that the above content only illustrates the technical idea of the present application, and cannot be used to limit the protection scope of the present application. For ordinary skilled persons in the technical field, a number of improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements all fall within the protection scope of the claims of the present application.

Claims

1. A method for precise positioning and installation of pre-embedded anchor plates on the foundation of bimetallic cryogenic tanks, characterized by: It comprises the following steps: (1) The pouring mode of the bimetallic low-temperature tank bearing platform is divided into compartments, and the middle area of the bearing platform is poured in the first stage. After the bearing platform formwork is installed, mark the position of each embedded plate using white self-spraying paint, and reserve the installation position of the embedded anchor plate during the binding of the bearing platform reinforcement; (2) The steel plate is inspected, marked, and cut. The cutting is performed by using a semi-automatic flame cutting machine, and the surface is polished to be smooth after flame cutting by using a grinding machine; The cut steel plate is welded into an embedded anchor plate, the outside is a protective sleeve, and the anchor belt is vertically inserted into the protective sleeve; (3) Measure the bearing platform center point coordinates and set stakes to facilitate subsequent measurement and positioning of the embedded anchor plate. The bearing platform center point coordinates are the center point of multiple embedded anchor plates; (4) Binding of the bearing platform reinforcement; (5) Hole reservation for the embedded anchor plate; the anchor belt is reserved for a hole: 250x250x1060h, a total of 480 reserved holes, the reserved holes are evenly divided with an arc of 2.8125°, and the starting point of the reserved hole is at 0° north and 1.40625° east; (6) Positioning of the embedded anchor plate; use total station, steel tape, and level to control the installation of the anchor plate from multiple directions such as angle, radius, and elevation; (7) Welding and fixing of the embedded anchor plate; (8) Pouring of the bearing platform concrete.

2. The method for precise positioning and installation of pre-embedded anchor plates on the foundation of bimetallic cryogenic tanks according to claim 1, characterized in that: The base is provided below the embedded anchor plate of step (2).

3. The method for precise positioning and installation of pre-embedded anchor plates on the foundation of bimetallic cryogenic tanks according to claim 1, characterized in that: The weld of the embedded anchor plate of step (2) is subjected to 100% PT detection.

4. The method according to claim 1, characterized in that: The measurement of the bearing platform center point coordinates of step (3) is measured by using a total station.

5. The bimetallic cryogenic tank pad pre-embedded anchor plate precise positioning installation method according to claim 1, characterized in that: The bearing platform reinforcement binding of step (4) is as follows: 1) Before binding the reinforcement, first lay a line on the base mold, mainly the central area reinforcement starting position line and the ring area reinforcement starting position line, and place the cushion block before binding the bottom reinforcement; the thickness of the cushion block is equal to the thickness of the concrete protective layer; 2) According to the construction zoning sequence of the drawing, the reinforcement is bound in sections When binding, proceed from the outer ring to the inner ring, first arrange the bottom reinforcement mesh, place the jack after binding, and then bind the upper mesh.

6. The bimetallic cryogenic tank pad pre-embedded anchor plate precise positioning installation method according to claim 5, characterized in that: The bottom reinforcement mesh of the bearing platform is two layers.

7. The bimetallic cryogenic tank pad pre-embedded anchor plate precise positioning installation method according to claim 1, characterized in that: The positioning of the embedded anchor plate of step (6) is to evenly distribute the points along the circumference with the bearing platform center point coordinates as the center, determine the elevation, and after determining the position of the embedded anchor plate, set the measure reinforcement on the outside for fixation.

8. The bimetallic cryogenic tank pad pre-embedded anchor plate precise positioning installation method according to claim 7, characterized in that: Use a steel ruler to control the positioning of the embedded part by re-measuring, and set up a level near the center point to control the top elevation of the embedded anchor plate.

9. The bimetallic cryogenic tank pad pre-embedded anchor plate precise positioning installation method according to claim 7, characterized in that: Two measure reinforcements are welded in the middle of the embedded anchor plate to fix the embedded anchor plate; four measure reinforcements are welded at the bottom of the embedded anchor plate to fix the embedded anchor plate with the bottom plate reinforcement, and control the height of the embedded anchor plate.

10. The method for precise positioning and installation of pre-embedded anchor plates on the foundation of a bimetallic cryogenic tank according to claim 9, characterized in that: During the welding process, place a magnetic level on the embedded anchor plate to control the perpendicularity of the embedded anchor plate.

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