Construction method of large-span steel tank skeleton

Abstract

The application discloses a construction method of a large-span steel groove framework, which comprises the following steps: in a target construction area, according to lofting requirements, installing a variable cross-section U-shaped channel steel on a prefabricated steel groove framework clamping groove unit, and the opening of the variable cross-section U-shaped channel steel is upward after installation; according to the lofting requirements, installing a load-bearing floor track channel steel on the top of the two side plates of the variable cross-section U-shaped channel steel respectively, and the openings of the two load-bearing floor track channel steels are opposite to each other after installation; according to the lofting requirements, installing a reinforcing rib system on the steel groove framework clamping groove unit, and the installation of the large-span steel groove framework unit is completed; and according to the extension direction of the large-span steel groove framework, sequentially splicing adjacent large-span steel groove framework units, and the overall installation of the large-span steel groove framework is completed. The application aims to solve the problem of low construction precision of the large-span steel groove framework which is assembled by a plurality of large-span steel groove framework units due to errors generated in the prefabrication and transportation of the large-span steel groove framework unit.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of building engineering, and particularly relates to a construction method of a large-span steel groove framework. BACKGROUND

[0002] The design requirement precision of the load-bearing floor is that the deviation between the center lines of two adjacent ground rails is + / - 2mm, the elevation difference between the two planes of the same ground rail steel groove is + / - 1mm, the unevenness of the ground rail along the length direction is less than or equal to 1mm / m, and the total allowable deviation of the full length is less than or equal to 20mm. A common problem at present is that all components of the large-span steel groove framework unit are made into an integral whole in a processing plant, the processing plant has no construction experience in this regard, and the components are cut and welded according to the conventional components, so that the high precision requirement cannot be guaranteed. Meanwhile, the large-span steel groove framework unit has a large size and a complex structure, and once it is processed and formed, it is difficult to make local adjustment, and deformation often occurs during transportation, especially the deformation of the variable cross-section U-shaped channel steel and the load-bearing ground rail groove which constitute the large-span steel groove framework unit will directly affect the final construction precision of the large-span steel groove framework. For the error of the integral processing of the large-span steel groove framework unit and the problem of transportation deformation, only cutting and repair welding can be carried out on site, and the repair process on site cannot meet the standard requirements. The error in the splicing and assembling process of the large-span steel groove framework unit with the error itself will eventually result in low construction precision of the large-span steel groove framework obtained by splicing and assembling the large-span steel groove framework unit. SUMMARY

[0003] In view of the problems in the prior art, the present application provides a construction method of a large-span steel groove framework, which aims to solve the problem of low construction precision of the large-span steel groove framework obtained by splicing and assembling the large-span steel groove framework unit due to the error of the large-span steel groove framework unit in prefabrication and transportation.

[0004] In order to solve the above technical problems, the present application is implemented by the following technical scheme:

[0005] The construction method of the large-span steel groove framework comprises the following steps:

[0006] In the target construction area, according to the lofting requirement, the variable cross-section U-shaped channel steel is installed on the prefabricated steel groove framework clamping groove unit, and the opening of the variable cross-section U-shaped channel steel is upward after installation;

[0007] According to the lofting requirement, the load-bearing ground rail groove steel is installed on the top of the two side plates of the variable cross-section U-shaped channel steel, and the openings of the two load-bearing ground rail groove steels are opposite to each other after installation;

[0008] According to the lofting requirement, the reinforcing rib system is installed on the steel groove framework clamping groove unit to complete the installation of the large-span steel groove framework unit;

[0009] According to the extension direction of the large-span steel tank skeleton, adjacent large-span steel tank skeleton units are sequentially spliced to complete the overall installation of the large-span steel tank skeleton.

[0010] Further, the prefabrication method of the steel tank skeleton clamping groove unit comprises:

[0011] According to the lofting requirements, U-shaped positioning frames are arranged on the jig in pairs.

[0012] According to the lofting requirements, first connecting members are installed through the inner bottom of the U-shaped positioning frames arranged in pairs.

[0013] According to the lofting requirements, second connecting members are installed horizontally on each U-shaped positioning frame near the top, so that the second connecting members are perpendicular to the first connecting members, the top height of the second connecting members is adapted to the bottom of the variable cross-section U-shaped channel steel to be installed, and a steel tank skeleton clamping groove unit is obtained.

[0014] Further, the U-shaped positioning frame comprises a horizontal bottom rod and vertical rods connected to both ends of the bottom rod.

[0015] Further, after the reinforcing rib system is installed on the steel tank skeleton clamping groove unit, the method further comprises:

[0016] A stiffening plate is installed at the position where the load-bearing track channel steel intersects with the vertical rod, so that one end of the stiffening plate extends into the load-bearing track channel steel to connect the load-bearing track channel steel and the vertical rod.

[0017] Further, the reinforcing rib system comprises horizontal reinforcing ribs, and the horizontal reinforcing ribs are installed through the inner sides of the U-shaped positioning frames arranged in pairs near the middle positions.

[0018] Further, the reinforcing rib system further comprises vertical reinforcing ribs, and the vertical reinforcing ribs are installed on both sides of the steel tank skeleton clamping groove unit.

[0019] Further, the reinforcing rib system further comprises inclined reinforcing ribs, and the inclined reinforcing ribs are installed around the steel tank skeleton clamping groove unit.

[0020] Further, after the load-bearing track channel steels are installed on the top of the two side plates of the variable cross-section U-shaped channel steel, the method further comprises:

[0021] A reinforcing connecting member is installed on the top of the two load-bearing track channel steels.

[0022] Further, the splicing of the adjacent large-span steel tank skeleton units comprises:

[0023] The two adjacent variable cross-section U-shaped channel steels, the two adjacent steel tank skeleton clamping groove units, and the two adjacent load-bearing track channel steels are connected by welding.

[0024] Further, the method further comprises:

[0025] Performing flaw detection on the spliced load-bearing track channel steel.

[0026] Compared with the prior art, the method has at least the following beneficial effects:

[0027] The method for constructing the large-span steel channel framework comprises the following steps: assembling and constructing the large-span steel channel framework components in groups, prefabricating secondary components and parts with low precision requirements, i.e., prefabricating the steel channel framework clamping groove units, installing the variable cross-section U-shaped channel steel on the prefabricated steel channel framework clamping groove units in the target construction area, and installing the load-bearing track channel steel on the top of the two side plates of the variable cross-section U-shaped channel steel.

[0028] To make the above objectives, characteristics and advantages of the present application more apparent, comprehensible and easier to understand, the following preferred embodiments are described in detail below, together with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] To more clearly illustrate the technical solutions in the specific embodiments of the present application, the following will briefly introduce the drawings needed in the description of the specific embodiments. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1 The figure is a schematic diagram of the U-shaped positioning frame construction stage in the embodiment of the present application.

[0031] Figure 2 The figure is a schematic diagram of the steel channel framework clamping groove unit construction stage in the embodiment of the present application.

[0032] Figure 3 The figure is a schematic diagram of the variable cross-section U-shaped channel steel construction stage in the embodiment of the present application.

[0033] Figure 4 The figure is a schematic diagram of the load-bearing track channel steel construction stage in the embodiment of the present application.

[0034] Figure 5 It is a schematic diagram of the reinforcing rib system construction stage (the front view of the large-span steel channel skeleton unit after assembly) in the embodiment of the present application.

[0035] Figure 6 It is a side view of the large-span steel channel skeleton unit after assembly in the embodiment of the present application.

[0036] In the figure: 1 - variable cross-section U-shaped channel steel; 2 - steel channel skeleton clamping groove unit; 20 - U-shaped positioning frame; 200 - bottom rod; 201 - vertical rod; 21 - first connecting piece; 22 - second connecting piece; 3 - force bearing rail channel steel; 4 - reinforcing rib system; 40 - horizontal reinforcing rib; 41 - vertical reinforcing rib; 42 - inclined reinforcing rib; 5 - mold base; 6 - stiffened plate; 7 - reinforcing connecting piece. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] The construction method of the large-span steel channel skeleton in the embodiment of the present application specifically comprises the following steps:

[0039] S1, in the target construction area, according to the lofting requirements, install the variable cross-section U-shaped channel steel 1 on the prefabricated steel channel skeleton clamping groove unit 2, and after installation, the opening of the variable cross-section U-shaped channel steel 1 faces upward. It should be understood that the lofting requirements are the requirements in the lofting drawing for the construction of the large-span steel channel skeleton. The lofting drawing is drawn by CAD software according to the size of 1:1 of the workpiece used on site.

[0040] It should be noted that the variable cross-section U-shaped channel steel 1 has a top located at the same horizontal plane, but the bottom is an inclined plane structure, in other words, the variable cross-section U-shaped channel steel 1 is large at one end and small at the other end, and gradually decreases from one end to the other end.

[0041] As a preferred embodiment, the prefabrication method of the steel channel skeleton clamping groove unit 2 is as follows:

[0042] First, according to the lofting requirements, the U-shaped positioning frame 20 is arranged opposite to the interval on the mold base 5. It should also be understood here that the mold base 5 also needs to be made according to the lofting drawing, and its manufacturing method adopts a conventional way, which will not be described here.

[0043] Preferably, the U-shaped positioning frame 20 comprises a horizontal bottom rod 200 and vertical rods 201 connected to both ends of the bottom rod 200. The vertical rods 201 are fixed to the bottom rod 200 by welding.

[0044] Secondly, according to the lofting requirements, the first connecting piece 21 is installed through the inside bottom of the U-shaped positioning frame 20. That is, the first connecting piece 21 is used to connect the U-shaped positioning frame 20, and the first connecting piece 21 is fixed to the U-shaped positioning frame 20 by welding.

[0045] Finally, according to the lofting requirements, the second connecting piece 22 is installed horizontally on the U-shaped positioning frame 20 near the top, so that the second connecting piece 22 is perpendicular to the first connecting piece 21, and the height of the top of the second connecting piece 22 is adapted to the bottom of the variable cross-section U-shaped channel steel 1 to be installed, thereby obtaining the steel channel skeleton slot unit 2. The second connecting piece 22 on each U-shaped positioning frame 20 is fixed to the corresponding two vertical rods 201 by welding. The variable cross-section U-shaped channel steel 1 is placed on the second connecting piece 22.

[0046] S2, according to the lofting requirements, the load-bearing floor track steel 3 is installed on the top of the two side plates of the variable cross-section U-shaped channel steel 1, and the openings of the two load-bearing floor track steels 3 are opposite to each other after installation, as shown in Figure 6

[0047] As a preferred embodiment, after the load-bearing floor track steel 3 is installed on the top of the two side plates of the variable cross-section U-shaped channel steel 1, it further comprises:

[0048] The reinforcing connecting piece 7 is installed on the top of the two load-bearing floor track steels 3, and the two load-bearing floor track steels 3 are reinforced by the reinforcing connecting piece 7. The reinforcing connecting piece 7 is welded on the top of the two load-bearing floor track steels 3, and is welded at the middle position of the load-bearing floor track steel 3.

[0049] S3, according to the lofting requirements, the reinforcing rib system 4 is installed on the steel channel skeleton slot unit 2 to complete the installation of the large-span steel channel skeleton unit.

[0050] Preferably, the reinforcing rib system 4 comprises horizontal reinforcing ribs 40, which are installed through the inside of the U-shaped positioning frame 20 near the middle position. Specifically, the horizontal reinforcing rib 40 is fixed to the U-shaped positioning frame 20 on each side of the inside of the U-shaped positioning frame 20 by welding, and more preferably, the horizontal reinforcing rib 40 is fixed to the middle position of the side of the U-shaped positioning frame 20.

[0051] ​Preferably, the reinforcing rib system 4 also includes vertical reinforcing ribs 41, and a plurality of vertical reinforcing ribs 41 are installed on both sides of the steel channel frame slot unit 2. Similarly, the plurality of vertical reinforcing ribs 41 are fixed to both sides of the steel channel frame slot unit 2 by welding. For example, the plurality of vertical reinforcing ribs 41 are arranged at equal intervals according to the layout requirements.

[0052] Preferably, the reinforcing rib system 4 also includes inclined reinforcing ribs 42, and a plurality of inclined reinforcing ribs 42 are installed around the steel channel frame slot unit 2. Specifically, the plurality of inclined reinforcing ribs 42 are fixed around the steel channel frame slot unit 2 by welding.

[0053] For example, the horizontal reinforcing bar 40, the vertical reinforcing bar 41, and the inclined reinforcing bar 42 are all made of steel bars.

[0054] In a preferred embodiment, after installing the reinforcing rib system 4 on the steel channel frame slot unit 2, the following is also included:

[0055] A stiffening plate 6 is installed at the intersection of the load-bearing ground rail channel steel 3 and the vertical rod 201, with one end of the stiffening plate 6 extending into the load-bearing ground rail channel steel 3 to connect the load-bearing ground rail channel steel 3 and the vertical rod 201.

[0056] For example, the stiffening plate 6 is fixed to the load-bearing ground rail channel steel 3 and the vertical rod 201 by welding.

[0057] S4. According to the extension direction of the large-span steel channel frame, sequentially splice adjacent large-span steel channel frame units to complete the overall installation of the large-span steel channel frame. Specifically, splicing adjacent large-span steel channel frame units is as follows:

[0058] The two adjacent variable cross-section U-shaped channel steels 1, the two adjacent steel channel skeleton slot units 2, and the two adjacent load-bearing ground rail channel steels 3 are connected by welding. After welding, the excess welding points need to be leveled, and gas cutting is not allowed.

[0059] Preferably, after sequentially splicing adjacent large-span steel channel frame units, the method further includes:

[0060] The spliced ​​load-bearing ground rail channel steel 3 is subjected to flaw detection. In this embodiment, ultrasonic flaw detection is used to check whether the overall connection quality of two adjacent fixed load-bearing ground rail channel steel 3 is qualified.

[0061] The following is combined Figures 1 to 6 The present invention will now be described in more detail.

[0062] a. Fabricate the jig 5 according to the layout drawings. The height of each support point on the jig 5 and the dimensions of the jig 5 meet the requirements of the layout drawings. Reinforce and stabilize the jig 5 to ensure that it can withstand the load applied to it. The assembly accuracy of the steel channel frame slot unit 2 is controlled and adjusted by the height and spacing of the jig 5; combined with Figure 5 and Figure 6 As shown, the steel channel frame slot unit 2 consists of a U-shaped positioning frame 20, a first connecting member 21, and a second connecting member 22. The U-shaped positioning frame 20 includes a horizontally arranged bottom rod 200 and vertical rods 201 connected vertically to both ends of the bottom rod 200. Both the bottom rod 200 and the vertical rods 201 are angle iron.

[0063] b. Verify that the relative positions and height differences of each support point on the jig 5 match the layout drawings. After confirming that there are no errors, draw the center line of the steel channel frame slot unit 2 on the jig 5. Figure 1 As shown, a U-shaped positioning frame 20 is installed according to the width of the slot frame slot unit to prevent the U-shaped positioning frame 20 from swinging. It is temporarily fixed on the jig frame, and the first connecting piece 21 is placed inside the U-shaped positioning frame 20.

[0064] To prevent the U-shaped positioning frame 20 from being welded onto the jig, a positioning weld with a thickness of no more than 3 mm and a length of no less than 40 mm is used, with a spacing of 300 mm to 600 mm.

[0065] c. Adjust the first connector 21 onto the U-shaped positioning frame 20 to ensure it is in place. Locate the second connector 22 at the top and mark it with a center crosshair on the U-shaped positioning frame 20. Figure 2 As shown, based on the dimensions in the layout drawing, find and mark the positions of the highest and lowest points of the second connector 22 on the cross line;

[0066] d. Check if the position and dimensions of the steel channel frame slot unit 2 on the jig and the height of the support points are correct. After adjusting it to match the position and dimensions on the layout drawings, transport this component to the installation site (this part of the installation can be fabricated in the factory or on-site). Figure 3 As shown, the variable cross-section U-shaped channel steel 1 is positioned and installed to the axial position using hoisting equipment, and then finely leveled.

[0067] e. such as Figure 4 As shown, load-bearing ground rail channel steel 3 is installed on the adjusted variable cross-section U-shaped channel steel. After measuring the elevation and dimensions between the two ends of the load-bearing ground rail channel steel 3 and confirming that they are consistent with the theoretical dimensions, the whole structure is temporarily fixed.

[0068] f. such as Figure 5 As shown, the reinforcing rib system 4 (using steel bars) of the connecting and fixing steel channel skeleton slot unit 2 forms a stable whole, thus obtaining a large-span steel channel skeleton unit.

[0069] g. Repeat a to f, after completing the assembly of the whole block in one direction, the adjacent two formed large-span steel trough skeleton units are leveled and the spacing is measured by using the super-high precision level, the adjustable device is used to adjust the axial height at any time, and after the design drawing requirements are met, the whole is formally fixed, and the stiffener plate 6 can be used for positioning at the joint.

[0070] h. The whole connection quality of the load-bearing rail groove steel 3 component is detected by flaw detection, and after the qualified, the next section is installed.

[0071] Notes:

[0072] 1) The jig frame should be fixed with expansion screws on the ground to avoid displacement or inclination of the jig frame during assembly.

[0073] 2) When the height of the steel trough skeleton clamping groove unit exceeds 1m, inclined struts should be installed around to avoid inclination.

[0074] 3) After the welding of the uppermost layer of steel bars and the load-bearing rail groove steel is completed, spot welding is carried out.

[0075] 4) A certain welding shrinkage allowance should be reserved between two assembled steel trough skeletons.

[0076] 5) When expanding and assembling to the four directions, it is necessary to ensure that the welding is synchronized and followed up, and the welding deformation should be observed at any time and adjusted in time.

[0077] The large-span steel trough skeleton component grouping construction method in the assembly process uses level, steel tape, level, line hammer and other tools to frequently monitor the U-shaped positioning frame, the first connecting piece, the load-bearing rail groove steel and the like, so as to ensure that the assembly precision meets the requirements. The steel trough skeleton is assembled on the ground, without the need to set up scaffolding or other operation platforms, reducing the amount of high-altitude work and effectively reducing the safety risk. This method is simple to construct, reduces the installation time, and can reduce the engineering cost.

[0078] Finally, it should be noted that the above-described embodiments are merely specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit the same. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that any person skilled in the art can still modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some of the technical features, within the technical scope disclosed by the present application. The modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A construction method of a long-span steel tank skeleton, characterized by, The method comprises the following steps: In the target construction area, according to the lofting requirements, a variable cross-section U-shaped channel steel (1) is installed on a prefabricated steel channel skeleton clamping groove unit (2), and the opening of the variable cross-section U-shaped channel steel (1) is upward after installation; According to the lofting requirements, a load-bearing floor track channel steel (3) is installed on the top of the two side plates of the variable cross-section U-shaped channel steel (1), respectively, and the openings of the two load-bearing floor track channel steels (3) are opposite to each other after installation; According to the lofting requirements, a reinforcing rib system (4) is installed on the steel channel skeleton clamping groove unit (2), and the installation of the large-span steel channel skeleton unit is completed; According to the extension direction of the large-span steel channel skeleton, the adjacent large-span steel channel skeleton units are sequentially spliced, and the overall installation of the large-span steel channel skeleton is completed; The prefabrication method of the steel channel skeleton clamping groove unit (2) comprises the following steps: According to the lofting requirements, U-shaped positioning frames (20) are arranged on the jig (5) in a spaced manner; According to the lofting requirements, first connecting pieces (21) are installed through the inside bottom of the U-shaped positioning frames (20) arranged in a spaced manner; According to the lofting requirements, a second connecting piece (22) is horizontally installed on each U-shaped positioning frame (20) near the top, so that the second connecting piece (22) is perpendicular to the first connecting piece (21), and the top height of the second connecting piece (22) is adapted to the bottom of the variable cross-section U-shaped channel steel (1) to be installed, thereby obtaining the steel channel skeleton clamping groove unit (2); The U-shaped positioning frame (20) comprises a horizontal bottom rod (200) and a vertical rod (201) connected to both ends of the bottom rod (200); After the reinforcing rib system (4) is installed on the steel channel skeleton clamping groove unit (2), the method further comprises the following steps: A stiffener (6) is installed at the position where the load-bearing floor track channel steel (3) intersects with the vertical rod (201), so that one end of the stiffener (6) extends into the load-bearing floor track channel steel (3) to connect the load-bearing floor track channel steel (3) and the vertical rod (201).

2. The construction method of a long-span steel tank skeleton according to claim 1, characterized in that, The reinforcing rib system (4) comprises horizontal reinforcing ribs (40), which are installed through the inside of the U-shaped positioning frames (20) arranged in a spaced manner near the middle position on both sides.

3. The construction method of a long-span steel tank skeleton according to claim 2, characterized in that, The reinforcing rib system (4) further comprises vertical reinforcing ribs (41), and a plurality of vertical reinforcing ribs (41) are installed on both sides of the steel channel skeleton clamping groove unit (2).

4. The construction method of a long-span steel tank skeleton according to claim 3, characterized in that, The reinforcing rib system (4) further comprises inclined reinforcing ribs (42), and a plurality of inclined reinforcing ribs (42) are installed around the steel channel skeleton clamping groove unit (2).

5. The construction method of a long-span steel tank skeleton according to claim 1, characterized in that, After the load-bearing floor track channel steel (3) is installed on the top of the two side plates of the variable cross-section U-shaped channel steel (1), respectively, the method further comprises the following steps: A reinforcing connecting piece (7) is installed on the top of the two load-bearing floor track channel steels (3).

6. The construction method of a long-span steel tank skeleton according to claim 1, characterized in that, The splicing of the adjacent large-span steel channel skeleton units comprises the following steps: The adjacent two variable cross-section U-shaped channel steels (1), the adjacent two steel channel skeleton clamping groove units (2), and the adjacent two load-bearing floor track channel steels (3) are connected by welding, respectively.

7. The construction method of a long-span steel tank skeleton according to claim 6, characterized in that, After the adjacent large-span steel channel skeleton units are sequentially spliced, the method further comprises the following steps: The spliced load-bearing floor track channel steel (3) is subjected to flaw detection.

Images