Overall Embedding Method for Large-Diameter Anchor Bolts at the Furnace Body Foundation

Abstract

The present invention relates to the technical field of metallurgical equipment construction, specifically to a method for integrally pre-embedding large-diameter anchor bolts of a furnace body. By using the method for integrally pre-embedding large-diameter anchor bolts of the furnace body described in the present invention, the construction of all anchor bolts is carried out integrally, and the anchor bolts are fixed by two layers of fixing rings. The structure is stable, which can effectively prevent the phenomena of inclination and dislocation of the anchor bolts during the construction process, ensure the pre-embedding accuracy of the anchor bolts, and provide a strong guarantee for the smooth installation of the furnace body in the later stage. The design is reasonable and the use effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical equipment construction, in particular to a method for integrally pre-embedding large-diameter anchor bolts of a furnace body. Background Art

[0002] In the metallurgical ironmaking system, the hot blast furnace is an important component. Generally, the furnace body is fixed by a flat circular anchor bolt group composed of 24 to 30 large-diameter anchor bolts. The pre-embedded quality of the anchor bolts determines whether the subsequent furnace body installation is smooth. Therefore, the construction accuracy of the anchor bolts is required to be high.

[0003] The traditional construction method is: after the foundation reinforcement is completed, the pre-buried anchor bolts are inserted into the steel mesh according to the position of the anchor bolts, and fixed with angle steel and other materials. In this construction method, the anchor bolts often collide with the laid steel bars during the insertion of the anchor bolts into the steel mesh, and the position of the steel bars needs to be adjusted again, which is troublesome. In addition, after the construction method is completed, there are large deviations in the verticality, overall height and spacing between the anchor bolts, which brings unnecessary troubles to the later installation of the furnace body. Summary of the invention

[0004] The present invention aims to solve the above problems, thereby providing a method for integrally pre-embedding large-diameter anchor bolts of a furnace body.

[0005] The present invention solves the above-mentioned problem by adopting the following technical solution:

[0006] A method for pre-embedding large-diameter anchor bolts of a furnace body as a whole is carried out according to the following steps:

[0007] Step 1: Lay out and measure. Use a total station to determine the center point of the furnace body at the specified furnace installation location and set a temporary point. Refer to the temporary point and use the total station to determine the position of the anchor bolts according to the drawing size and make temporary marks on the anchor bolts.

[0008] Step 2: Make cushion embedded parts, which are composed of a rectangular steel plate and four legs. Place the anchor bolt embedded parts and the center point embedded parts respectively according to the anchor bolt positions and the center point positions of the furnace body determined in step 1;

[0009] Step 3: Cast the cushion layer. During the process, the embedded parts of the cushion layer are fixed manually to ensure the position of the embedded parts in the cushion layer. After the casting is completed, the position, spacing and height of the embedded parts are re-measured using a total station, ruler and level. The exact position of the anchor bolts is determined and marked on the embedded parts.

[0010] Step 4: Place the anchor bolts on the cushion embedment respectively and carry out temporary reinforcement. After the placement is completed, use a total station, a straightedge, and a level to measure various data of the anchor bolts to ensure that the anchor bolts are vertical, all the anchor bolts have the same height, and the distances between the anchor bolts are equal;

[0011] Step 5: Lay a layer of steel mesh above the cushion and carry out binding;

[0012] Step 6: Prefabricate the first layer of fixing rings at the fabrication site. The single-layer fixing ring consists of the following parts: an outer ring plate, an inner ring plate, angle steels, and temporary connecting ear plates; among them, the radius of the central circle of the outer ring plate is the same as the distance from the anchor bolt to the center point of the furnace body. The inner ring plate and the outer ring plate are fixedly connected by angle steels, and multiple temporary connecting ear plates are evenly distributed on the top of the outer ring plate;

[0013] Step 7: Open bolt holes on the outer ring plate corresponding to the positions of the anchor bolts. The hole diameter is required to be larger than the actual size of the anchor bolt. After the holes are opened, use a level and a ruler to measure the flatness of the ring plate and the distance between the hole diameters respectively. The temporary connecting ear plates are located between two adjacent anchor bolt holes;

[0014] Step 8: Use a crane to carry out multi-point hoisting of the fabricated first layer of fixing rings. During the hoisting process, use a level to measure the level of the fixing rings at any time. After the anchor bolts pass through the anchor bolt holes of the outer ring plate, place angle steel brackets under the outer ring plate as temporary supports, and cut and remove the temporary connecting ear plates for hoisting on the outer ring plate;

[0015] Step 9: Lay a steel mesh above the first layer of fixing rings and carry out binding;

[0016] Step 10: Refer to Steps 6 to 8 to fabricate and install the second layer of fixing rings;

[0017] Step 11: Place a laser alignment instrument at the center point on the furnace body embedment, place alignment plates on the inner fixing ring plates of the first layer of fixing rings and the second layer of fixing rings respectively. Turn on the alignment laser instrument to observe the offset of the laser on the alignment plates of the first layer of fixing rings and the second layer of fixing rings, and after adjustment, weld the fixing rings and the anchor bolts. Weld the two ends of the angle steel supports of the first layer to the cushion embedment and the first layer of fixing rings respectively, and weld the two ends of the angle steel supports of the second layer to the first layer of fixing rings and the second layer of fixing rings respectively;

[0018] Step 12: Carry out the pouring of the foundation concrete.

[0019] The present invention adopting the above technical solution, compared with the prior art, its prominent features are:

[0020] By adopting the method for integrally pre-embedding the large-diameter anchor bolts of the furnace body described in the present invention, all the anchor bolts are constructed as a whole, and the anchor bolts are fixed by two layers of fixing rings. The structure is stable, and the tilting and dislocation of the anchor bolts can be effectively prevented during the construction process, thereby ensuring the pre-embedding accuracy of the anchor bolts, providing a strong guarantee for the smooth installation of the furnace body in the later stage, and the design is reasonable and the use effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of measurement and positioning according to an embodiment of the present invention;

[0022] Figure 2 It is a bottom view structural diagram of the cushion layer embedded part according to an embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the side view structure of the cushion layer embedded part according to an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the placement position of the cushion layer embedded parts according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the placement of anchor bolts according to an embodiment of the present invention;

[0026] Figure 6 It is a schematic diagram of the side view structure after the anchor bolts are placed according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the top view of the structure after the steel mesh is laid according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic side view of the structure of the steel mesh after laying according to an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the main structure of the first-layer fixing ring of an embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of a top view of the structure of the second-layer fixing ring according to an embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the hoisting of a fixing ring according to an embodiment of the present invention;

[0032] Figure 12 This is a schematic diagram of the top view of the structure after the first layer of fixing rings are hoisted in an embodiment of the present invention;

[0033] Figure 13 This is a schematic diagram of the side structure of the first layer of fixing ring after the installation is completed in the embodiment of the present invention;

[0034] Figure 14 This is a schematic diagram of the installation structure of the angle steel bracket of the first layer fixing ring of an embodiment of the present invention;

[0035] Figure 15 This is a schematic diagram of the main structure after the hoisting of the second-layer fixing ring in the embodiment of the present invention;

[0036] Figure 16 This is a schematic top view of the structure after the hoisting of the second-layer fixing ring in the embodiment of the present invention;

[0037] Figure 17 This is a schematic front view of using a centering laser instrument and a centering plate for centering in the embodiment of the present invention;

[0038] Figure 18 This is a schematic diagram of the main structure after concrete pouring in the embodiment of the present invention;

[0039] In the figure, the markings are: temporary marking of anchor bolts 1, total station 2, center point of the furnace body 3, anchor bolt embedment 4, center point embedment 5, steel wire rope 6, fixing ring 7, anchor bolt 8, steel bar mesh 9, cushion layer 10, foundation concrete 11, first-layer outer ring plate 12, center circle of the outer ring plate 13, temporary connecting ear plate 14, first-layer angle steel 15, first-layer inner ring plate 16, bolt holes of the first-layer outer ring plate 17, first-layer angle steel bracket 18, horizontal fine-tuning plate 19, second-layer outer ring plate 20, second-layer angle steel 21, second-layer inner ring plate 22, bolt holes of the second-layer outer ring plate 23, second-layer angle steel bracket 24, laser centering instrument 25, centering plate 26, centering laser 27. Embodiment

[0040] The following further illustrates the present invention with reference to embodiments. The purpose is only to better understand the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0041] See Figures 1 - 18 , a method for integral embedding of large-diameter anchor bolts of a furnace body is carried out according to the following steps:

[0042] Step 1: See Figure 1 , conduct layout measurement. According to the drawing dimensions, use the total station 2 to determine the center point 3 of the furnace body at the specified furnace body installation position, set temporary points, and use the total station 2 to determine the anchor bolt positions according to the drawing dimensions with reference to the temporary points and make temporary markings 1 for the anchor bolts;

[0043] Step 2: See Figure 2 , Figure 3 , fabricate cushion layer embedments. The embedment consists of a 300*300*10 rectangular steel plate and 4 threaded steel legs with a length of 150. A total of 13 groups of embedments are fabricated, and the anchor bolt embedment 4 and the center point embedment 5 are respectively placed according to the anchor bolt positions and the center point position of the furnace body determined in Step 1;

[0044] Step 3: SeeFigure 4 , Figure 5 , the cushion layer 10 is poured, and the embedded parts of the cushion layer are fixed manually during the process to ensure the position of the embedded parts in the cushion layer 10. After the pouring is completed, the position, spacing and height of the embedded parts are re-measured using the total station 2, ruler and level, and the accurate position of the anchor bolts 8 is determined on the embedded parts and marked;

[0045] Step 4: See Figure 5 , Figure 6 , place the anchor bolts 8 on the anchor bolt cushion embedded parts 4 for temporary reinforcement, and after placement, use the total station 2, ruler, and level to measure various data of the anchor bolts 8 to ensure that the anchor bolts 8 are vertical, all the anchor bolts 8 have the same height, and the spacing between the anchor bolts 8 is equal;

[0046] Step 5: See Figure 7 , Figure 8 , lay a layer of steel mesh on top of the cushion layer and tie it up;

[0047] Step 6: See Figure 9 The first-layer fixing ring 7 is prefabricated at the production site. The first-layer fixing ring 7 is composed of the following parts: a first-layer outer ring plate 12, a first-layer inner ring plate 16, a first-layer angle steel 15, and a temporary connection ear plate 14; wherein the center circle radius 13 of the outer ring plate is the same as the distance from the anchor bolt 8 to the center point 3 of the furnace body, the first-layer inner ring plate 16 is fixedly connected to the first-layer outer ring plate 12 by the first-layer angle steel 15, and a plurality of temporary connection ear plates 14 are evenly distributed on the top of the first-layer outer ring plate 12;

[0048] Step 7: See Figure 9 , according to the size of the drawing, the first layer outer ring plate bolt hole 17 corresponding to the position of the anchor bolt 8 is opened on the first layer outer ring plate 12, and the hole diameter is required to be larger than the actual diameter of the anchor bolt 8. After the hole is opened, the horizontality of the ring plate and the distance between the hole diameters are measured using a level and a ruler respectively. The temporary connection ear plate is located between two adjacent anchor bolt holes;

[0049] Step 8: See Figures 11 - 14 , the prepared first-layer fixing ring 7 is hoisted at multiple points by a crane through a steel wire rope 6. During the hoisting process, a level is used to measure the level of the fixing ring 7 at any time to prevent the fixing ring 7 from tilting and colliding with the anchor bolt 8. After the anchor bolt 8 passes through the bolt hole 17 of the first-layer outer ring plate, a first-layer angle steel bracket 18 is placed under the first-layer outer ring plate 12 as a temporary support, and the temporary connecting ear plate 14 for hoisting on the first-layer outer ring plate 12 is cut and removed;

[0050] Step 9: See Figure 15 , a steel mesh is laid on top of the first layer of fixing ring 7 and tied;

[0051] Step Ten: Refer to Figure 15 and Figure 16 , and referring to Steps Six to Eight, fabricate and install the fixing ring 7 of the second layer; the fixing ring 7 of the second layer consists of the following parts: including the outer ring plate 20 of the second layer, the inner ring plate 22 of the second layer, the angle steel 21 of the second layer, and the temporary connecting ear plate 14;

[0052] Step Eleven: Refer to Figure 17 , place the laser alignment instrument 25 at the center point on the embedded part 5 of the furnace body center point, respectively install the alignment plates 26 on the inner ring fixing plates of the first layer fixing ring and the second layer fixing ring, turn on the alignment laser instrument 25 to observe the offset of the alignment laser 27 on the alignment plates 26 of the first layer fixing ring and the second layer fixing ring, and after adjustment, weld the fixing ring and the anchor bolts 8. Weld the two ends of the angle steel support 18 of the first layer to the embedded part of the cushion layer and the first layer fixing ring respectively, and weld the two ends of the angle steel support 24 of the second layer to the first layer fixing ring and the second layer fixing ring respectively;

[0053] Step Twelve: Refer to Figure 18 , carry out the pouring of the foundation concrete 11; carry out protective treatment on the threaded part of the anchor bolts before pouring; the pouring thickness of the foundation concrete 11 is the embedded elevation of the anchor bolts.

[0054] Adopt the overall embedded method of large-diameter anchor bolts for the furnace body of the present invention to construct all the anchor bolts as a whole, and fix the anchor bolts through two layers of fixing rings. The structure is stable, which can effectively prevent the phenomena of inclination and dislocation of the anchor bolts during the construction process, ensure the embedded accuracy of the anchor bolts, and provide a strong guarantee for the smooth installation of the furnace body in the later stage. The design is reasonable and the use effect is good.

[0055] The above are only the preferred and feasible embodiments of the present invention, and do not limit the scope of rights of the present invention accordingly. Any equivalent changes made by using the content of the specification and drawings of the present invention are all included in the scope of rights of the present invention.

Claims

1. An overall pre-embedding method for large-diameter anchor bolts of a furnace body, characterized in that, Follow these steps: Step 1: Lay out and measure. Use a total station to determine the center point of the furnace body at the specified furnace installation location and set a temporary point. Refer to the temporary point and use the total station to determine the position of the anchor bolts according to the drawing size and make temporary marks on the anchor bolts. Step 2: Make cushion embedded parts, which are composed of a rectangular steel plate and four legs. Place the anchor bolt embedded parts and the center point embedded parts respectively according to the anchor bolt positions and the center point positions of the furnace body determined in step 1; Step 3: Cast the cushion layer. During the process, the embedded parts of the cushion layer are fixed manually to ensure the position of the embedded parts in the cushion layer. After the casting is completed, the position, spacing and height of the embedded parts are re-measured using a total station, ruler and level. The exact position of the anchor bolts is determined and marked on the embedded parts. Step 4: Place the anchor bolts on the cushion embedded parts for temporary reinforcement. After placement, use a total station, ruler, and level to measure the data of the anchor bolts to ensure that the anchor bolts are vertical, all the anchor bolts are of the same height, and the spacing between the anchor bolts is equal; Step 5: Lay a layer of steel mesh on top of the cushion layer and tie it up; Step 6: Prefabricate the first layer of fixing rings at the production site. The single-layer fixing ring consists of the following parts: an outer ring plate, an inner ring plate, angle steel, and a temporary connection ear plate; the center circle radius of the outer ring plate is the same as the distance from the anchor bolt to the center point of the furnace body, the inner ring plate and the outer ring plate are fixedly connected by angle steel, and multiple temporary connection ear plates are evenly distributed on the top of the outer ring plate; Step 7: Open bolt holes on the outer ring plate corresponding to the anchor bolts. The hole diameter is required to be larger than the actual size of the anchor bolts. After the holes are opened, use a level and a ruler to measure the horizontality of the ring plate and the distance between the hole diameters. The temporary connection ear plate is located between two adjacent anchor bolt holes. Step 8: Use a crane to hoist the first layer of fixed rings at multiple points. Use a level to measure the level of the fixed rings at any time during the hoisting process. After the anchor bolts pass through the anchor bolt holes of the outer ring plate, place angle steel brackets under the outer ring plate as temporary support, and cut and remove the temporary connection ear plates on the outer ring plate for hoisting; Step 9: Lay the steel mesh on top of the first layer of fixing rings and tie them up; Step 10: Refer to steps 6 to 8 to make and install the second layer of fixing rings; Step 11: Place a laser centroider at the center point of the embedded part in the center of the furnace body, and place centroiding plates on the inner ring plates of the first and second fixed rings respectively. Turn on the centroiding laser to observe the offset of the laser centroiding plates on the first and second fixed rings. After adjustment, weld the fixed rings to the anchor bolts, weld the two ends of the first angle steel support to the cushion embedded part and the first fixed ring respectively, and weld the two ends of the second angle steel support to the first and second fixed rings respectively. Step 12: Pour foundation concrete.

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