Embedded inclined steel column mounting method

Abstract

The invention relates to the field of steel structure building construction, and discloses an embedded inclined steel column mounting method which comprises the following steps: step 1, surveying and setting out, and pre-embedding a positioning plate; secondly, column foot anchor bolts are installed according to the positions of anchor holes reserved in the positioning plate; thirdly, a first section of foundation is poured to the elevation of the positioning plate, and after concrete reaches certain strength, column foot anchor bolts are positioned and rechecked; fourthly, a steel column is installed on the positioning plate; fifthly, a second section of foundation is poured to the designed elevation; according to the scheme, the step of pre-embedding the positioning plate is carried out before the first section of foundation is poured, so that the technical problems that when an existing embedded type steel column installation method is used for construction, the positioning process of pouring of the first section of foundation is rough, and the precision of the steel column installation process is low can be solved.

Description

Technical Field

[0001] The invention relates to the field of steel structure building construction, and in particular to a method for installing an embedded inclined steel column. Background Art

[0002] In recent years, with the gradual improvement of economic and social levels, steel structure buildings have become more and more common, but the construction quality of steel structure buildings varies greatly. One of the more important reasons is the installation quality of the steel column foot (i.e. the bottom of the steel column), which is related to the stability and installation quality of the overall steel structure. Steel column foot includes three types: exposed column foot, outsourced column foot and embedded column foot. In earthquake-resistant design, embedded type should be preferred. Embedded steel column foot refers to a structural design in which the steel column foot is installed into a concrete foundation. In the field of construction, embedded steel column foot is widely used in various types of buildings. Its stability and strength can effectively support the weight of the entire building.

[0003] The construction method of embedded steel columns mainly involves the following process: first, embed the connecting parts (such as anchor plates, anchor bolts, etc.) at the designed position, and then pour the concrete foundation to form the lower foundation. After the concrete of the lower foundation reaches a certain strength, the steel column is fixedly connected to the lower foundation through the above-mentioned embedded connecting parts, and then continue to pour the concrete foundation to form the upper foundation, so that the bottom structure of the steel column is buried in the upper foundation.

[0004] The prior art has disclosed a method for constructing column bases embedded in ground beams (publication number: CN111980153A), which aims to solve the problems of difficulty in installing steel column bases and low installation accuracy in related technologies. The method includes the steps of laying out the ground beam and pouring concrete for the first time: marking the position of the ground beam on the foundation ground, and pouring concrete at the marked position. A careful study of the prior art shows that the prior art generally locates the pouring position of the first concrete by simply marking the position of the ground beam on the foundation ground before the first pouring of concrete. The positioning process is rough and cannot meet the current construction project's higher accuracy requirements for the installation process of steel column bases. Summary of the invention

[0005] The present invention aims to provide a method for installing an embedded inclined steel column to improve the installation accuracy of the steel column foot.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] The embedded inclined steel column installation method comprises the following steps:

[0008] Step 1: Measure and lay out the lines, and embed the positioning plate;

[0009] Step 2: Install the column foot anchor bolts according to the reserved anchor hole positions on the positioning plate;

[0010] Step 3: Pour the first section of foundation to the elevation of the positioning plate. After the concrete reaches a certain strength, check the positioning of the column foot anchor bolts.

[0011] Step 4: Install the steel column on the positioning plate;

[0012] Step 5: Pour the second section of foundation to the designed elevation.

[0013] Beneficial effects: The installation of inclined steel columns requires precise control of their inclination angles to ensure that they are consistent with the design drawings. Any angle deviation may lead to uneven force distribution of the structure and affect the stability of the overall structure. The implementation of this solution is conducive to improving the accuracy of the construction process. In the prior art, the first concrete pouring position is located by simply marking the position of the ground beam on the foundation ground before the first concrete pouring. This method has a rough positioning process and is difficult to meet the high-precision requirements of the installation process of the steel column foot in modern construction projects. In contrast, this technical solution ensures that the installation position of the column foot anchor bolts in the subsequent steps is accurate by measuring and laying out the lines and pre-embedding the positioning plate in the first step. The positioning plate not only provides an accurate installation reference for the column foot anchor bolts, but also plays a positioning and fixing role in the subsequent first stage of foundation pouring. After the concrete reaches a certain strength, the accuracy of the column foot anchor bolts can be further ensured by positioning and checking the positioning of the column foot anchor bolts, thereby providing a reliable reference for the subsequent installation of steel columns, and ensuring the stability and reliability of the overall building structure by improving the accuracy of the construction process, thereby ensuring the construction quality.

[0014] Preferably, as an improvement, in step one, a total station is used to measure and lay out the embedded position of the positioning plate.

[0015] Beneficial effects: First, the total station is a high-precision measuring device that integrates angle measurement, distance measurement and data processing functions. It can provide accurate measurement data to ensure that the embedded position of the positioning plate is exactly the same as the design drawings. This high precision is difficult to achieve with traditional measuring tools. Especially in complex construction projects, the total station can significantly reduce errors and improve construction quality. Secondly, the embedded position of the positioning plate directly affects the stability and bearing capacity of the subsequent structure. If the embedded position is inaccurate, it may cause the structure to be loosely connected, or even deformed or damaged under load, endangering the safety of the entire building. Using a total station to measure and lay out the embedded position of the positioning plate can ensure that the position of the positioning plate meets the accuracy requirements of the design drawings and avoid rework and cost increase due to construction errors. It is conducive to improving the construction quality and efficiency of the entire project.

[0016] Preferably, as an improvement, in step 2, a total station is used to verify the positioning of the column base anchor bolts.

[0017] Beneficial effects: First, as a high-precision measuring instrument, the total station can provide accurate measurement data in three-dimensional space, and its accuracy is much higher than that of traditional measuring tools. When positioning and checking the column foot anchor bolts, the total station can not only measure the horizontal and vertical directions, but also accurately measure the distance through the electronic distance meter, so as to achieve accurate positioning in three-dimensional space. This high-precision measurement method can effectively avoid position deviations caused by human errors or insufficient accuracy of traditional measuring tools. In large-scale structural engineering, the position accuracy of the column foot anchor bolts will directly affect the installation of subsequent components and the stability of the overall structure. The application of the total station ensures that each column foot anchor bolt is strictly checked in accordance with the requirements of the design drawings. This precise positioning not only reduces the possibility of rework, but also greatly improves the construction efficiency and ensures the smooth progress of the entire project. Secondly, the step of positioning and checking the column foot anchor bolts is very important, otherwise it will directly affect the installation of subsequent structures. Using a more accurate total station for measurement is conducive to ensuring the high-quality completion of the entire project. If there is a deviation in the position of the anchor bolt, it will not only cause the subsequent components to be unable to be accurately positioned, but may also trigger a series of chain reactions, increasing the difficulty and cost of construction.

[0018] Preferably, as an improvement, the column base anchor bolts used in step 2 include a locking nut and an adjusting nut. In step 4, after the steel column is installed on the positioning plate, the elevation of the steel column is adjusted by turning the adjusting nut.

[0019] Beneficial effects: By setting the adjusting nut, the elevation of the steel column can be accurately adjusted during the installation process to ensure that it reaches the height required by the design. The fine-tuning steps of the adjusting nut are simple and efficient. The position of the steel column can be precisely controlled by simply turning the adjusting nut. This fine-tuning method not only improves the installation accuracy, but also greatly reduces the rework caused by inaccurate initial positioning, saves adjustment time and cost, and improves the accuracy and flexibility of steel column installation.

[0020] Preferably, as an improvement, in step four, a total station and a level are used in conjunction with an adjusting nut to adjust the steel column to the designed elevation, and ensure that the base of the steel column is fixed horizontally.

[0021] Beneficial effects: Through the precise measurement of the total station and the level, it can be ensured that the steel column is accurately adjusted to the design elevation during the installation process, which not only means that the height position of the steel column fully meets the design requirements, but also ensures the accuracy of the steel column in three-dimensional space. This high-precision adjustment is particularly important for large-scale structural projects because it directly affects the installation of subsequent components and the stability of the overall structure.

[0022] Preferably, as an improvement, after step 4 and before step 5, after the steel column is fixed, non-shrinkage grouting material is poured to the bottom of the steel column.

[0023] Beneficial effects: By pouring grouting material at the bottom of the steel column, the gap between the steel column and the foundation can be effectively filled, ensuring a close connection between the steel column and the foundation. The shrinkage-free grouting material has almost no shrinkage during the curing process, or the shrinkage is very small and negligible, which means that the shrinkage-free grouting material can maintain its original volume after hardening, and will not produce cracks or gaps due to shrinkage, which can significantly improve the density of the filling material. This also means that during the pouring process, the grouting material can completely fill all gaps, eliminate air bubbles, and form a solid whole. In this way, the connection between the steel column and the foundation becomes more stable, reducing the problem of overall structural instability of the building caused by gaps.

[0024] Preferably, as an improvement, the step of pouring the non-shrinkage grouting material is performed by high-pressure pouring, and the non-shrinkage grouting material is a high-strength C60 grouting material.

[0025] Beneficial effects: Through high-pressure pouring, high-strength C60 grouting material can be quickly and evenly injected into the target area. This high-pressure pouring method can effectively drive out air bubbles and ensure that the grouting material can fully fill every tiny space during the pouring process. The C60 grouting material itself has high strength and fluidity. With the assistance of high-pressure pouring, the grouting material can better penetrate into the gaps and voids of the structure, thereby greatly improving the density of the grouting material. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of the special-shaped banquet hall in the first embodiment of the present invention;

[0027] Figure 2 This is a process flow chart of Embodiment 1 of the present invention;

[0028] Figure 3-Figure 9 It is a structural schematic diagram of the implementation process of the method for installing an embedded inclined steel column in the first embodiment of the present invention;

[0029] Fig.10 for Figure 1 A magnified schematic diagram of position A in the middle;

[0030] Fig.11 for Figure 1 A magnified schematic diagram of position B in the middle. DETAILED DESCRIPTION

[0031] The following is further described in detail through specific implementation methods:

[0032] The figure marks in the drawings of the specification include: radial beam 1, first radial beam 1a, second radial beam 1b, arc beam 2, inclined column 3, upper section column 31, lower section column 32, steel bar 4, cushion layer 5, positioning plate 6, concrete 7, grouting material 8, anchor bolt 9, first connecting plate 10, second connecting plate 11, annular plate 12, extension plate 13, connecting piece 14, top plate 15.

[0033] Embodiment 1

[0034] Installation method of embedded inclined steel column, such as Figure 1 The specific application shown is a large-scale special-shaped banquet hall, which is designed as a four-layer steel beam. Each layer of steel beams includes an outer arc beam 2 and a radial beam 1 connected to the inner side of the arc beam 2. The arc beams 2 of each layer of steel beams are connected at the periphery to form a circle. The diameter of the steel beam on the top layer is smaller than the diameter of the steel beam on the bottom layer. The diameters of the lower three layers of steel beams (including the bottom layer, the second layer and the third layer) increase from bottom to top, and inclined columns 3 are fixedly connected between the peripheries of the lower three layers of steel beams by connecting components. The inclined columns 3 include an upper section column 31 and a lower section column 32 that are fixedly connected, wherein the lower section column 32 includes a vertical straight column, a joint integrally formed at the top of the vertical straight column and inclined toward the upper section column 31, and the upper section column 31 is an inclined column inclined toward the center of the banquet hall; the lower end of the inclined column is fixed to the joint by an installation ear. Specifically, a connection assembly is fixedly arranged on the lower three-layer steel beam, an upper section column 31 on the inclined column 3 is fixedly assembled on the connection assembly, and a lower section column 32 on the inclined column 3 is fixed to the ground by implementing an embedded inclined steel column installation method.

[0035] Combination Figure 2-Figure 8 As shown, the embedded inclined steel column installation method specifically includes the following steps:

[0036] Step 1: Construction preparation

[0037] S1: Transport the steel structure to the construction site. After confirming the hoisting time, actively cooperate with the arrangements of relevant departments to ensure the safety and smooth completion of the hoisting. Before hoisting, verify whether the size of the steel structure is correct and check whether there is mud, dirt or other debris at the bolting position. If there is any, clean it up;

[0038] S2: Prepare qualified positioning plates 6 and column anchor bolts to ensure that the reserved anchor holes on the positioning plates 6 and the column anchor bolts can be used together. The column anchor bolts used in this embodiment are made of Q355B steel in accordance with the national standard "Low Alloy High Strength Structural Steel" (GB / T1591-2018). Each set of anchor bolts is equipped with two caps and one washer, i.e., an upper nut, a lower nut, and a washer;

[0039] Step 2: Construction pit (such as Figure 3 (shown)

[0040] S1: Measure and lay out, confirm the location of the foundation pit, excavate, and clean and level the formed foundation pit;

[0041] S2: Use concrete 7 to pour a cushion layer 5 on the foundation soil. When the cushion layer 5 reaches a certain strength, bury the bottom reinforcement of the ground beam and lay the steel bars 4;

[0042] S3: After the cushion layer 5 is completely solidified and reaches the design strength, the foundation steel bars 4 are tied (including the steel bar 4 cage), laying the foundation for the subsequent installation of the positioning plate 6;

[0043] Step 3: Pre-embed the positioning plate 6 and install the column foot anchor bolt 9 (combined with Figure 4 and Figure 5 (shown)

[0044] S1: Clean the surface of the cushion layer 5 again to ensure that there is no debris, soil or other obstacles, and then check the flatness and strength of the cushion layer 5 to ensure that it can support the weight of the positioning plate 6;

[0045] S2: measuring and setting out, using a total station to determine the exact position of the positioning plate 6, and marking the center point and edge line of the positioning plate 6 on the cushion layer 5;

[0046] S3: Place the positioning plate 6 on the cushion layer 5, and adjust it according to the marked center point and edge line to ensure that the positioning plate 6 is accurately positioned;

[0047] S4: Install the column foot anchor bolt 9 according to the reserved anchor hole position on the positioning plate 6, and vertically insert the column foot anchor bolt 9 into the cushion layer 5;

[0048] Step 5: Cast the first foundation and reposition the column anchor bolts

[0049] S1: Figure 6 As shown, concrete 7 is used to cast the first foundation to the level of the positioning plate 6;

[0050] S2: After the concrete 7 reaches a certain strength, the column foot anchor bolts are repositioned using a total station;

[0051] Step 6: Install the lower column 32

[0052] S1: Figure 7 As shown, the column foot plate on the lower section column 32 of the steel column is installed on the positioning plate 6, and the height of the steel column is adjusted to the designed position by using the adjusting nut located at the bottom of the column foot plate in conjunction with the total station and the level to ensure its levelness;

[0053] S2: Tighten the fixing nut on the upper part of the column foot plate and weld around it to completely fix the lower column 32. Figure 8 As shown, 100 mm thick C60 high-strength non-shrinkage grouting material 8 is poured under high pressure at the bottom of the lower column 32;

[0054] The inclined steel column of this technology is a special-shaped structure, which is a two-stage structure, with a vertical lower column 32 at the bottom and an inclined upper column 31 at the top; therefore, when installing the lower column 32, its stability needs to be ensured to be suitable for this special special-shaped installation scene. Therefore, this technology can ensure higher positioning accuracy and stronger stability of the overall construction structure.

[0055] Step 7: Cast the second foundation

[0056] S1: Use concrete 7 to pour the second foundation to the designed elevation;

[0057] S2: Wait for the concrete 7 to solidify.

[0058] Step 8: Install the upper column 31 (combined with Fig.10 and Fig.11 )

[0059] S1: Before installation, multiple positioning lines are pre-popped out at the joint docking port between the column foot of the upper section column 31 and the top of the lower section column 32 as the installation reference line, and the first connecting plate 5 is set at each positioning line. The first connecting plate 5 is fixedly connected to the upper section column 31 and the lower section column 32 by welding; the two second connecting plates 6 are respectively fixed on both sides of the first connecting plate 5 of the upper section column 31 by bolts. After the upper section column 31 is hoisted to the installation position, the upper section column 31 is aligned with the lower section column 32 connection head, the first connecting plate 5 on the lower section column 32 connection head is inserted between the corresponding two second connecting plates 6, the remaining bolts are inserted into the second connecting plate 6 and the first connecting plate 5 on the lower section column 32 connection head, and the center lines of the four sides of the upper section column 31 are aligned with the center lines of the four sides of the lower section column 32 connection head. When the center lines of the four sides are aligned or the deviation is controlled within the range required by the specification, the bolts are tightened to temporarily fix, and then reinforced by welding the docking. At this time, the upper section column 31 is still in the hoisting state.

[0060] The first radial beam 1a, which is located at the lower installation position, is hoisted first. After the first radial beam 1a is hoisted in place, it is aligned according to the construction drawing. After alignment, the two ends of the first radial beam 1a are fixed at the same time. One end of the first radial beam 1a is fixedly connected to the column 1 through a connecting plate, and the other end of the first radial beam 1a is fixedly connected to the lower end of the upper section column 31 through a connecting assembly. After confirming that it is properly tightened, release the hook. Then hoist the second radial beam 1b. After the second radial beam 1b is hoisted in place, align the second radial beam 1b. After alignment, the two ends of the second radial beam 1b are fixed at the same time. One end of the second radial beam 1b is fixedly connected to the column 1 through a connecting plate, and the other end of the second radial beam 1b is fixedly connected to the upper end of the upper section column 31 through a connecting assembly. After confirming that it is properly tightened, release the hooks on the second radial beam 1b and the upper section column 31. When hoisting and fixing the upper section column 31 and the steel beam 4, measurement and monitoring should be carried out to ensure the installation accuracy of the upper section column 31 and the steel beam 4. The connection assembly includes two upper and lower annular plates 10, which are welded to the upper section column 31. An extension plate 13 extending outward is provided between the upper and lower annular plates 10. The extension plate 13 is integrally formed with the annular plates 10, and the extension plate 13 is fixedly connected to the first radial beam 1a or the second radial beam 1b through a connecting piece 14. The connection assembly at the top of the upper section column 31 also includes a top plate 15, which is sealed on the top of the upper section column 31 and is integrally formed with the annular plate 12. The connection assembly realizes a stable connection between the upper section column 31 and the steel beam 4, enhances the rigidity and stability of the overall structure, improves the overall coordination and adaptability of the structure, reduces the workload on site, and improves the installation efficiency.

[0061] After the installation is completed, a temporary support frame can be made of No. 16 I-beam under the inclined column 3 to reinforce the inclined column 3 and ensure construction safety. It can ensure the rapid positioning and fixation of the upper column after hoisting to the installation position, improving the installation accuracy and efficiency. By setting the first connecting plate 5 and the second connecting plate 6, the precise docking between the upper column 31 and the lower column 32 is ensured. The connecting plate simplifies the fixing process, improves the stability and reliability of the connection, reduces the error caused by manual adjustment, and ensures the stability of the overall structure and the construction quality.

[0062] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. The buried inclined steel column installation method is characterized by: The steps include: Step 1: Measure and lay out, and embed the positioning plate; Step 2: Install the column foot anchor bolts according to the reserved anchor hole positions on the positioning plate; Step 3: Pour the first section of foundation to the elevation of the positioning plate. After the concrete reaches a certain strength, check the positioning of the column foot anchor bolts. Step 4: Install the steel column on the positioning plate; Step 5: Pour the second section of foundation to the designed elevation.

2. The method for installing an embedded inclined steel column according to claim 1, characterized in that: In the step 1, a total station is used to measure and lay out the pre-buried position of the positioning plate.

3. The method for installing an embedded inclined steel column according to claim 2, characterized in that: In the step 2, a total station is used to verify the positioning of the column foot anchor bolts.

4. The method for installing an embedded inclined steel column according to claim 1 or 3, characterized in that: The column foot anchor bolts used in the step 2 include a fixing nut and an adjusting nut. In the step 4, after the steel column is installed on the positioning plate, the elevation of the steel column is adjusted by screwing the adjusting nut.

5. The method for installing an embedded inclined steel column according to claim 4, characterized in that: In step four, use the total station and level with the adjusting nut to adjust the steel column to the designed elevation and ensure that the base of the steel column is fixed horizontally.

6. The method for installing an embedded inclined steel column according to claim 5, characterized in that: After step 4 and before step 5, after the steel column is fixed, pour non-shrinkage grouting material to the bottom of the steel column.

7. The method for installing an embedded inclined steel column according to claim 6, characterized in that: The step of pouring the non-shrinkage grouting material is performed by high-pressure pouring, and the non-shrinkage grouting material is high-strength C60 grouting material.

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